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Title:
MOTOR PUMP
Document Type and Number:
WIPO Patent Application WO/2008/140278
Kind Code:
A2
Abstract:
A motor pump is disclosed. The motor pump includes a pump body including a casing which is fastened to an inlet case having an inlet port through which inlet water is introduced from a tank by coupling inlet fastening portions to fastening portions, a pumping partition wall disposed inside the casing and having a rotation shaft seating hole formed at its center to form a pumping space between the inlet case and the pumping partition wall, and a discharge port which disch arges pressed water from the pumping space. The motor pump further includes a pumping part including an impeller which is disposed inside the pumping space of the pump body, has a rotation coupling hole formed at its center, and also has impeller wings therein to press the inlet water in the pumping space by rotation, and a rotation part including a rotation case having a rotor at its center, which is fixedly installed on the pumping partition wall while opposite ends of a rotation shaft are supported by shaft supporters such that the rotation shaft coupled to a rotation coupling hole of the impeller of the pumping part is safely inserted into the rotation shaft seating hole, support spacers which are magnets having polarity and are formed on the shaft supporters supporting the rotation shaft toward opposite sides of the rotor, and spacing members which are magnets having the same polarity as the support spacers and are formed at opposite sides of the rotation shaft toward the shaft supporters, wherein an electromagnet is formed at an outside of the rotation case to rotate the rotor with the rotation shaft.

Inventors:
GEUM, Jong-gwan (70-1, Goean-dong Sosa-gu, Bucheon-si, Gyeonggi-do 422-800, KR)
Application Number:
KR2008/002735
Publication Date:
November 20, 2008
Filing Date:
May 16, 2008
Export Citation:
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Assignee:
GEUM, Jong-gwan (70-1, Goean-dong Sosa-gu, Bucheon-si, Gyeonggi-do 422-800, KR)
International Classes:
F04D13/06
Attorney, Agent or Firm:
BON PATENT & LAW FIRM (6th Floor Daeyoung Building, 1552-1 Seocho-3dong Seocho-gu, Seoul 137-873, KR)
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Claims:

Claims

[ 1 ] A motor pump comprising: a pump body including a casing which is fastened to an inlet case having an inlet port through which inlet water is introduced from a tank by coupling inlet fastening portions to fastening portions, a pumping partition wall disposed inside the casing and having a rotation shaft seating hole formed at its center to form a pumping space between the inlet case and the pumping partition wall, and a discharge port which discharges pressed water from the pumping space; a pumping part including an impeller which is disposed inside the pumping space of the pump body, has a rotation coupling hole formed at its center, and also has impeller wings therein to press the inlet water in the pumping space by rotation; and a rotation part including a rotation case having a rotor at its center, which is fixedly installed on the pumping partition wall while opposite ends of a rotation shaft are supported by shaft supporters such that the rotation shaft coupled to a rotation coupling hole of the impeller of the pumping part is safely inserted into the rotation shaft seating hole, support spacers which are magnets having polarity and are formed on the shaft supporters supporting the rotation shaft toward opposite sides of the rotor, and spacing members which are magnets having the same polarity as the support spacers and are formed at opposite sides of the rotation shaft toward the shaft supporters, wherein an electromagnet is formed at an outside of the rotation case to rotate the rotor with the rotation shaft.

[2] The motor pump according to claim 1, wherein the rotation part includes inlet ports formed on the shaft supporters of the rotation case supporting the rotation shaft such that the rotation part is rotated while inlet water is introduced into the rotation part to press and pump the inlet water.

[3] A motor pump comprising: a pump body which includes: an inlet case including an inlet port in which an inlet fixing member having at least one inlet hole is installed such that inlet water is introduced through the inlet hole, inlet fastening portions which are disposed at an outer periphery of the inlet case, a casing which has fastening portions at its outer periphery to be fastened to the inlet fastening portions and has a pumping space therein, a pumping partition wall, having a rotation shaft seating hole at its center, which is disposed in the casing to form a pumping space therein, and a pump body having a discharge port disposed at one surface of the casing to

discharge pressed water from the pumping space; a pumping part which includes: an impeller which is disposed inside the pumping space and has a rotation coupling hole, impeller wings which are formed at an outer periphery of the impeller, and a support rotation shaft which is installed to be inserted into the rotation coupling hole of the impeller and has a support space therein; and a rotation part which includes: a rotation support shaft which has one end fixed to the inlet fixing member and the other end fixed to a shaft fixing member while being inserted into the support space, a rotation case having the shaft fixing member, a rotor which is positioned in the rotation case and is integrally coupled with the support rotation shaft and the impeller, and an electromagnet which is disposed at an outside of the rotation case and generates an electromagnetic force to rotate the rotor. [4] The motor pump according to claim 3, wherein the inlet port includes: an inlet support spacer which is a magnet having polarity and is disposed toward the impeller, and an impeller spacing member which is a magnet having opposite polarity and is disposed at a position corresponding to the inlet support spacer of the support rotation shaft. [5] The motor pump according to claim 3, wherein the support rotation shaft includes: a rotation spacing member which is a magnet having polarity and is disposed toward the shaft fixing member, and a rotation support spacer which is a magnet having opposite polarity and is disposed at a position corresponding to the rotation spacing member of the shaft fixing member. [6] The motor pump according to claim 3, wherein the support rotation shaft further includes an impeller support bush which is disposed at a position coupled with the impeller and is supported by the rotation support shaft in the support space. [7] The motor pump according to claim 3, wherein the support rotation shaft further includes a rotation support bush which is disposed at a position coupled with the rotor and is supported by the rotation support shaft in the support space. [8] The motor pump according to claim 3, wherein the rotation support shaft further includes an impeller stopper which is protrudingly formed to prevent a contact between the inlet fixing member and the impeller.

[9] The motor pump according to claim 3, wherein the rotation support shaft further includes a rotor stopper which is protrudingly formed to prevent a contact between the rotor and the shaft fixing member.

[10] The motor pump according to claim 3, wherein the rotor is formed as a magnetic body to respond to the electromagnet.

Description:

Description

MOTOR PUMP

Technical Field

[1] The present invention relates to a motor pump.

Background Art

[2] Generally, a pump is a machine which transports a fluid through a pipe using a pressure operation. The pump is a machine for transporting a fluid such as liquid or gas through a pipe by a pressure operation or a machine for force-feeding fluid in a low- pressure container to a high-pressure container through a pipe.

[3] Various pumps have been developed for drain of underground water in a mine, irrigation of agricultural water or the like. Generally, the pump is used in an agricultural village, a mine, engineering works, a factory, a home or the like to use a fluid.

[4] Further, the pump is also widely used in transportation of a special fluid such as petroleum, medicine, pulp, viscose, sludge or the like in addition to water.

[5] The basic performance of the pump is represented by a lift which is a height to which the pump can lift liquid up and a flow rate which is a volume at which the pump can extrude liquid for a unit time period. Accordingly, there are various types of pumps according to the lift, the flow rate and a kind of liquid.

[6] In a motor pump using a motor among the pumps for fluid extrusion, a rotor is rotated by an electromotive force of an electromagnet applied with power to press and discharge the introduced fluid by an operation of pressing wings.

[7] An electric hot water mat using the conventional motor pump is explained with reference to Figs. 1 and 2.

[8] The electric hot water mat includes a mat part 10 and a hot water supply part 20. The mat part 10 includes a mat 11 having a hot water circulation line 12 for circulating hot water therein as in a floor heater, a hot water supply line 13 which is disposed at one side of the hot water circulation line 12 to supply hot water, and a hot water discharge line 14 which is disposed at the other side of the hot water circulation line 12.

[9] The hot water supply part 20 includes a hot water tank 21 which is disposed at one side of the mat part 10 and has a heating unit 22 for heating supplied water, and a motor pump 23 which is disposed at one side of the hot water tank 21 and is connected to the hot water supply line 13 of the mat part 10 to supply hot water such that the circulated hot water returns to the hot water discharge line 14 connected to the other side of the hot water tank 21.

[10] The motor pump 23 includes an inlet port 24 through which the hot water of the hot

water tank 21 is introduced, and a rotor 26 and pressing wings 27 coupled to the rotor 26, which are disposed at the inside of the inlet port 24 and are rotated by a magnetic force of an electromagnet 25 by application of power to press the hot water. The pressed hot water is supplied to a discharge port 28 connected to the hot water supply line 13 disposed at one side of the inlet port 24 and, then, is circulated.

[11] In the conventional motor pump installed at the hot water tank to circulate hot water, however, an operation of the electromagnet is started to rotate the rotor in a state where the hot water is introduced into the motor pump. In an initial operation of the rotor without introduction of hot water, the rotor is in contact with the installation side. Accordingly, an excessive electromotive force is required due to friction, and a rotation operation is difficult due to failure in the initial operation.

[12] In order to solve the problem in which the rotor is in contact with a shaft supporting member in the initial rotation to generate failure, the conventional motor pump is provided with a rotation unit which is manually rotated and is attached to a rear portion of a rotation shaft. However, installation costs are raised to provide a watertight structure and damage of the rotor is generated due to compulsory rotation.

[13] Further, in the conventional motor pump, since a required electromotive force is increased due to friction generated in the initial operation of the rotor, a motor having a larger capacity than a pump operating capacity should be installed. Accordingly, an installation space is enlarged and power consumption is increased, thereby increasing costs according to the increased capacity.

[14] Further, in the conventional motor pump, rotation interference is generated in the rotation of the rotor to reduce a rotation driving force inputted to the electromagnet, thereby causing a problem of reducing rotation efficiency. Moreover, in the conventional motor pump, while the rotor is rotated by an electromotive force generated in the electromagnet according to application of power, the rotor is in contact with the supporting side, thereby reducing rotation efficiency. Also, damage and malfunction frequently occur due to friction generated in high-speed rotation. Disclosure of Invention Technical Problem

[15] Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a motor pump wherein support spacers serving as magnets having polarity are formed toward a rotor at shaft supporters supporting a rotation shaft of a rotor of a motor pump for supplying pressed water, spacing members serving as magnets having the same polarity as the support spacers are formed at the opposite sides of the rotation shaft supporting the rotor, and the rotor is operated while the rotor is maintained at a specific distance from the shaft supporters

by a repulsive force due to the same polarity between the rotor and the shaft supporters, thereby increasing rotation efficiency of the motor pump by preventing friction and increasing a life span of the motor pump by minimizing damage and breakage due to friction. Technical Solution

[16] In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a motor pump comprising: a pump body including a casing which is fastened to an inlet case having an inlet port through which inlet water is introduced from a tank by coupling inlet fastening portions to fastening portions, a pumping partition wall disposed inside the casing and having a rotation shaft seating hole formed at its center to form a pumping space between the inlet case and the pumping partition wall, and a discharge port which discharges pressed water from the pumping space; a pumping part including an impeller which is disposed inside the pumping space of the pump body, has a rotation coupling hole formed at its center, and also has impeller wings therein to press the inlet water in the pumping space by rotation; and a rotation part including a rotation case having a rotor at its center, which is fixedly installed on the pumping partition wall while opposite ends of a rotation shaft are supported by shaft supporters such that the rotation shaft coupled to a rotation coupling hole of the impeller of the pumping part is safely inserted into the rotation shaft seating hole, support spacers which are magnets having polarity and are formed on the shaft supporters supporting the rotation shaft toward opposite sides of the rotor, and spacing members which are magnets having the same polarity as the support spacers and are formed at opposite sides of the rotation shaft toward the shaft supporters, wherein an electromagnet is formed at an outside of the rotation case to rotate the rotor with the rotation shaft.

[17] The rotation part includes inlet ports formed on the shaft supporters of the rotation case supporting the rotation shaft such that the rotation part is rotated while inlet water is introduced into the rotation part to press and pump the inlet water.

[18] In accordance with another aspect of the present invention, there is provided a motor pump comprising: a pump body which includes: an inlet case including an inlet port in which an inlet fixing member having at least one inlet hole is installed such that inlet water is introduced through the inlet hole, inlet fastening portions which are disposed at an outer periphery of the inlet case, a casing which has fastening portions at its outer periphery to be fastened to the inlet fastening portions and has a pumping space therein, a pumping partition wall, having a rotation shaft seating hole at its center, which is disposed in the casing to form a pumping space therein, and a pump body having a discharge port disposed at one surface of the casing to discharge pressed

water from the pumping space; a pumping part which includes: an impeller which is disposed inside the pumping space and has a rotation coupling hole, impeller wings which are formed at an outer periphery of the impeller, and a support rotation shaft which is installed to be inserted into the rotation coupling hole of the impeller and has a support space therein; and a rotation part which includes: a rotation support shaft which has one end fixed to the inlet fixing member and the other end fixed to a shaft fixing member while being inserted into the support space, a rotation case having the shaft fixing member, a rotor which is positioned in the rotation case and is integrally coupled with the support rotation shaft and the impeller, and an electromagnet which is disposed at an outside of the rotation case and generates an electromagnetic force to rotate the rotor.

[19] The inlet port includes an inlet support spacer which is a magnet having polarity and is disposed toward the impeller, and an impeller spacing member which is a magnet having opposite polarity and is disposed at a position corresponding to the inlet support spacer of the support rotation shaft.

[20] The support rotation shaft includes a rotation spacing member which is a magnet having polarity and is disposed toward the shaft fixing member, and a rotation support spacer which is a magnet having opposite polarity and is disposed at a position corresponding to the rotation spacing member of the shaft fixing member.

[21] The support rotation shaft further includes an impeller support bush which is disposed at a position coupled with the impeller and is supported by the rotation support shaft in the support space.

[22] The support rotation shaft further includes a rotation support bush which is disposed at a position coupled with the rotor and is supported by the rotation support shaft in the support space.

[23] The rotation support shaft further includes an impeller stopper which is protrudingly formed to prevent a contact between the inlet fixing member and the impeller.

[24] The rotation support shaft further includes a rotor stopper which is protrudingly formed to prevent a contact between the rotor and the shaft fixing member.

[25] The rotor is formed as a magnetic body to respond to the electromagnet.

Advantageous Effects

[26] The motor pump according to the embodiments of the present invention includes the support spacers which are magnets having polarity and are formed toward the rotor at the shaft supporters supporting the rotation shaft of the rotor of the motor pump for supplying pressed water, and the spacing members which are magnets having the same polarity as the support spacers and are formed at the opposite sides of the rotation shaft supporting the rotor. The rotor is operated while the rotor is maintained at a specific

distance from the shaft supporters by a repulsive force due to the same polarity between the rotor and the shaft supporters. Accordingly, it is possible to increase rotation efficiency of the motor pump by preventing friction and to increase a life span of the motor pump by minimizing damage and breakage due to friction.

[27] Further, in the motor pump according to the embodiments of the present invention, after the inlet water introduced toward the inlet port is supplied to the pumping space, the impeller with the impeller wings is rotated by the rotation shaft of the rotation part to generate a pressing force and supply pressed water through the discharge port. The support spacers serving as magnets having polarity are formed toward the rotor at the shaft supporters supporting the rotation shaft, and the spacing members serving as magnets having the same polarity as the support spacers are formed toward the shaft supporters of the rotor. Accordingly, when the electromagnet is operated to rotate the impeller, the rotor is rotated without friction while a specific distance is maintained by a repulsive force of the magnets, thereby minimizing loss of a rotational force in an initial operation and improving rotation efficiency.

[28] Further, in the motor pump according to the embodiments of the present invention, the support spacers serving as magnets having polarity are formed toward the rotor of the shaft supporters formed in the rotation case to rotate the rotation shaft, and the spacing members serving as magnets having the same polarity as the support spacers are formed at the opposite ends of the shaft supporters of the rotor. The rotor is rotated by a magnetic force applied from the electromagnet while being supported by the rotation shaft with the shaft supporters. Accordingly, since the distance between the rotated rotor and the shaft supporters is maintained by a repulsive force of the magnets, it is possible to prevent a contact of the supporting portion due to the rotation, thereby increasing a life span of the motor pump.

[29] Further, in the motor pump according to the embodiments of the present invention, the support spacers serving as magnets having polarity are formed at the shaft supporters supporting the rotation shaft, and the magnets having the same polarity are formed on the rotor at positions corresponding to the support spacers. Accordingly, since the specific distance is maintained by a repulsive force of the magnets, it is possible to prevent reduction in an electromotive force due to friction in an initial operation. Also, the operation can be efficiently performed without increasing the capacity of the motor, thereby improving productivity.

[30] Further, in the motor pump according to the embodiments of the present invention, since the inlet ports are formed at the shaft supporters supporting the rotor, the rotor is rotated while the inlet water is introduced to the rotor. Accordingly, the inlet water prevents friction of the rotated rotor, thereby increasing a life span of the rotor.

[31] Further, in the motor pump according to the embodiments of the present invention,

the rotor rotated by an electromotive force of the electromagnet is formed integrally with the impeller, and they are rotated while be supported by the fixed rotation support shaft, thereby improving rotation efficiency.

[32] Further, in the motor pump according to the embodiments of the present invention, the impeller having the impeller wings which press the inlet water introduced to the inlet port in the casing and the rotor rotated by an electromotive force of the electromagnet are integrally coupled with the hollow support rotation shaft having the support space. The rotation support shaft having one end fixed to the inlet port having the inlet fixing member and the other end fixed to the rotation case having the shaft fixing member is rotated while being inserted into the support space, thereby minimizing rotation loss and improving a rotational force.

[33] Further, in the motor pump according to the embodiments of the present invention, the inlet support spacer serving as a magnet having polarity is disposed toward the impeller at the inlet port for introducing inlet water which is pressed and discharged, and the impeller spacing member serving as a magnet having polarity opposite to the inlet support spacer is disposed at the impeller of the support rotation shaft, thereby preventing the impeller from being in contact with the inlet port in the rotation by a repulsive force due to opposite polarities of the inlet support spacer and the impeller spacing member to improve the rotation efficiency.

[34] Further, in the motor pump according to the embodiments of the present invention, the rotation spacing member serving as a magnet having polarity is disposed at the other end of the support rotation shaft, and the rotation support spacer serving as a magnet having opposite polarity is disposed at the rotor of the shaft fixing member corresponding to the rotation spacing member, thereby preventing a contact in the rotation of the rotor by a repulsive force due to opposite polarities of the rotation spacing member and the rotation support spacer to improve the rotation efficiency.

[35] Further, in the motor pump according to the embodiments of the present invention, the rotation support shaft, which is inserted to support the impeller and the rotation shaft formed integrally with the support rotation shaft and is fixed with the inlet port and the shaft fixing member, includes the impeller stopper which is protrudingly formed between the impeller and the inlet port, thereby physically preventing the impeller from being in contact with the inlet port in the rotation of the impeller to improve rotation efficiency.

[36] Further, in the motor pump according to the embodiments of the present invention, the rotation support shaft, which is inserted to support the impeller and the rotation shaft formed integrally with the support rotation shaft and is fixed with the inlet port and the shaft fixing member, includes the rotor stopper which is protrudingly formed between the rotor and the shaft fixing member, thereby physically preventing the rotor

from being in contact with the shaft fixing member in the rotation of the rotor to improve rotation efficiency. [37] Further, in the motor pump according to the embodiments of the present invention, the support rotation shaft further includes the impeller support bush which is inserted into the support space at the impeller. The support rotation shaft is rotated while being supported with the impeller support bush on the fixed rotation support shaft, thereby improving rotation efficiency. [38] Further, in the motor pump according to the embodiments of the present invention, the support rotation shaft further includes the rotation support bush which is inserted into the support space at the rotor. The support rotation shaft is rotated while being supported with the rotation support bush on the fixed rotation support shaft, thereby improving rotation efficiency. [39] Further, in the motor pump according to the embodiments of the present invention, the rotor which is rotated by an electromotive force of the electromagnet is formed as a magnetic body, thereby improving rotation efficiency due to mutual magnetic influence of the electromagnet and the rotor.

Brief Description of the Drawings [40] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: [41] Fig. 1 illustrates a configuration of a general electric hot water mat;

[42] Fig. 2 illustrates a cross-sectional view of a conventional motor pump;

[43] Fig. 3 illustrates a perspective view showing a motor pump according to the present invention; [44] Fig. 4 illustrates an exploded perspective view showing the motor pump according to the present invention; [45] Fig. 5 is a cross-sectional view showing the motor pump according to the present invention; [46] Fig. 6 illustrates a perspective view showing a motor pump according to another embodiment of the present invention; [47] Fig. 7 illustrates a cross-sectional view showing the motor pump according to another embodiment of the present invention; [48] Fig. 8 illustrates a cross-sectional view showing a motor pump according to still another embodiment of the present invention; [49] Fig. 9 illustrates a cross-sectional view showing an installation state of an impeller support bush in the motor pump according to still another embodiment of the present invention; and

[50] Fig. 10 illustrates an installation state of the motor pump according to the present invention. Best Mode for Carrying Out the Invention

[51] Hereinafter, a motor pump according to the present invention will be described with reference to the accompanying drawings.

[52] First of all, the same components and parts are designated by similar reference numerals in the drawings. In the description of the present invention, the detailed description of related well-known functions or configurations will be omitted if they possibly make the spirit of the present invention vague.

[53] Although the present invention is related to a pump having a motor, a motor pump used in an electric hot water mat is described as an example for convenience of explanation.

[54] Fig. 3 illustrates a perspective view showing a motor pump according to the present invention. Fig. 4 illustrates an exploded perspective view showing the motor pump according to the present invention. Fig. 5 is a cross-sectional view showing the motor pump according to the present invention. Fig. 6 illustrates a perspective view showing a motor pump according to another embodiment of the present invention. Fig. 7 illustrates a cross-sectional view showing the motor pump according to another embodiment of the present invention. Fig. 8 illustrates a cross-sectional view showing a motor pump according to still another embodiment of the present invention. Fig. 9 illustrates a cross-sectional view showing an installation state of an impeller support bush in the motor pump according to still another embodiment of the present invention. Fig. 10 illustrates an installation state of the motor pump according to the present invention.

[55] As shown in Figs. 3 to 10, a motor pump 100 according to the present invention is a circulation pump 100 which is disposed at one side of a hot water tank 21 having a heating unit 22 to supply hot water heated by the heating unit 22 to an electric mat 10 which circulates the hot water to perform heating. The motor pump 100 includes a pump body 110 which introduces hot water to press and discharge the hot water, a pumping part 120 which presses the hot water introduced into the pump body 110, and a rotation part 130 which is connected to the pumping part 120 and rotates to press the hot water.

[56] The pump body 110 includes a casing 111 which is fastened to an inlet case 117 having an inlet port 118 through which inlet water (hot water) is introduced from the hot water tank 21 by coupling inlet fastening portions 117a to fastening portions 115; a pumping partition wall 113 disposed inside the casing 111 and having a rotation shaft seating hole 114 formed at its center to form a pumping space 112 between the inlet

case 117 and the pumping partition wall 113; and a discharge port 116 which discharges pressed water from the pumping space 112.

[57] The pumping part 120 includes an impeller 121 disposed inside the pumping space

112 of the pump body 110, having a rotation coupling hole 122 formed at its center, and also having impeller wings 123 therein, thereby pressing the inlet water in the pumping space 112 by rotation.

[58] The rotation part 130 includes a rotation case 131 having a rotor 133 at its center, which is fixedly installed on the pumping partition wall 113 while opposite ends of a rotation shaft 132 are supported by shaft supporters 135 such that the rotation shaft 132 coupled to a rotation coupling hole 122 of the impeller 121 of the pumping part 120 is safely inserted into the rotation shaft seating hole 114. In the rotation part 130, support spacers 136 which are magnets having polarity are formed on the shaft supporters 135 supporting the rotation shaft 132 at the opposite sides toward the rotor 133. Further, spacing members 134 which are magnets having the same polarity as the support spacers 136 are formed at the opposite sides of the rotation shaft 132 toward the shaft supporters 135. An electromagnet 138 is formed at the outside of the rotation case 131 to rotate the rotor 133 with the rotation shaft 132.

[59] In the rotation part 130, preferably, inlet ports 118 are formed on the shaft supporters

135 of the rotation case 131 supporting the rotation shaft 132 such that the rotation part 130 is rotated while inlet water is introduced into the rotation part 130 to press and pump the inlet water.

[60] A motor pump 100 according to another embodiment of the present invention includes a pump body 110 which is coupled to an inlet case 117 having an inlet port 118 through which inlet water is introduced and has a casing 111 having a pumping space 112; a pumping part 120 which is disposed in the pumping space 112 of the pump body 110 and has an impeller 121 having impeller wings 123; and a rotation part 130 having a rotation case 131 having a rotor 133 which is integrally coupled with the impeller 121 of the pumping part 120 and is rotated by the electromagnet 138.

[61] The inlet case 117 includes the inlet port 118 in which an inlet fixing member 118a having at least one inlet hole 118b is installed such that inlet water is introduced through the inlet hole 118b. Inlet fastening portions 117a are disposed at an outer periphery of the inlet case 117.

[62] The casing 111 includes fastening portions 115 at its outer periphery such that the inlet case 117 is fastened to the casing 111 by coupling the inlet fastening portions 117a to the fastening portions 115. A pumping partition wall 113 having a rotation shaft seating hole 114 is disposed in the casing 111 to form a pumping space 112 therein.

[63] The pump body 110 includes a discharge port 116 disposed at one surface of the

casing 111 to discharge water, which is introduced from the inlet port and is pressed, to the outside.

[64] The impeller 121 is disposed inside the pumping space 112 and has an rotation coupling hole 122 at the center thereof. The impeller wings 123 are disposed at the outer periphery of the impeller 121 to press the inlet water.

[65] In this case, a support rotation shaft 124 having a support space 125 therein is installed to be inserted into the rotation coupling hole 122 of the impeller 121.

[66] In this case, an impeller support bush 127 is installed at the side of the impeller 121 in the support space 125 to support the rotation such that a rotation support shaft 139 is inserted into the impeller support bush 127, thereby improving a supporting force in the rotation of the impeller 121.

[67] Further, a rotation support bush 126 is disposed at the side of the rotor 133 in the support space 125 to support the rotation such that the rotation support shaft 139 is inserted into the rotation support bush 126, thereby improving a supporting force in the rotation of the rotor 133.

[68] Further, the inlet port 118 includes an inlet support spacer 118c which is a magnet having polarity and is disposed toward the impeller 121, and an impeller spacing member 128 which is a magnet having opposite polarity and is disposed at a position corresponding to the inlet support spacer 118c of the support rotation shaft 124.

[69] Accordingly, the inlet support spacer 118c serving as a magnet having polarity is disposed at the inlet port 118, and the impeller spacing member 128 serving as a magnet having opposite polarity is disposed at the impeller 121 of the support rotation shaft 124 which is rotated to press inlet water, thereby preventing the impeller 121 from being in contact with the inlet port 118 in the rotation by a magnetic repulsive force.

[70] The rotation case 131 includes a shaft fixing member 139a which fixes the other end of the rotation support shaft 139 having one end fixed to the inlet fixing member 118a.

[71] The rotor 133 is integrally coupled with the support rotation shaft 124 coupled to the impeller 121 by inserting the rotation support shaft 139 into the support space 125, and the rotor 133 is positioned inside the rotation case 131.

[72] In this case, the rotor 133 is formed as a magnetic body having a magnetic force, and the magnetic force of the magnetic body corresponds to the electromotive force of the electromagnet 138, thereby improving rotation efficiency.

[73] The rotation support shaft 139 has one end fixed to the inlet fixing member 118a and the other end fixed to the shaft fixing member 139a. The rotation support shaft 139 is inserted into the support space 125 of the support rotation shaft 124, which is integrally coupled with the impeller 121 and the rotor 133 to support the rotation.

[74] The electromagnet 138, which generates an electromotive force to rotate the rotor

133, is disposed at the outside of the rotation case 131.

[75] The support rotation shaft 124 includes a rotation spacing member 129 which is a magnet having polarity and is disposed toward the shaft fixing member 139a, and a rotation support spacer 139b which is a magnet having opposite polarity and is disposed at a position corresponding to the rotation spacing member 129 of the shaft fixing member 139a.

[76] Accordingly, the rotation spacing member 129 serving as a magnet having polarity is disposed at the rotor 133 of the support rotation shaft 124, and the rotation support spacer 139b serving as a magnet having opposite polarity is disposed at the shaft fixing member 139a, thereby preventing the rotor 133 from being in contact with the shaft fixing member 139a in the rotation by a magnetic repulsive force.

[77] According to still another embodiment of the present invention, a rotation support shaft 139, which has one end fixed to the inlet fixing member 118a and the other end fixed to the shaft fixing member 139a, includes an impeller stopper 139c which is pro- trudingly formed between the impeller 121 and the inlet port 118, thereby preventing a contact between the impeller 121 and the inlet port 118.

[78] The rotation support shaft 139 further includes a rotor stopper 139d which is pro- trudingly formed between the rotor 133 and the shaft fixing member 139a, thereby preventing a contact between the rotor 133 and the shaft fixing member 139a.

[79] Accordingly, the rotation support shaft 139 includes the impeller stopper 139c formed at the impeller 121 and the rotor stopper 139d formed at the rotor 133 to prevent a contact of the impeller 121 and rotor 133 integrally coupled with the rotation support shaft 139 in the rotation, thereby improving rotation efficiency. Mode for the Invention

[80] An effect of the motor pump having the above configuration according to the present invention will be described below.

[81] First, when power is applied while water is supplied into the hot water tank 21, the water is heated into hot water by the heating unit 22 in the hot water tank 21. Then, inlet water (hot water) is introduced into the inlet port 118 of the motor pump 100 formed at one side of the hot water tank 21 by fastening the fastening portions 115 of the casing 111 to the inlet fastening portions 117a.

[82] After the inlet water introduced toward the inlet port 118 is supplied to the pumping space 112 formed between the pumping partition wall 113 and the inlet case 117, an operation of the electromagnet 138 of the rotation part 130 is started. In this case, the support spacers 136 serving as magnets having polarity are formed at the shaft supporters 135 supporting the opposite sides of the rotation shaft 132 in the rotation case 131 of the rotation part 130. The spacing members 134 serving as magnets having

the same polarity as the support spacers 136 are formed at positions corresponding to the support spacers 136 at the opposite ends of the rotor 133 which is rotated by an electromotive force of the electromagnet 138 at the center of the rotation shaft 132. Accordingly, while the support spacers 136 and the spacing members 134 are maintained at a specific distance by a repulsive force due to the same polarity, the rotor 133 is operated without friction by an electromotive force of the electromagnet 138 applied with power, thereby performing the rotation of the rotation shaft 132.

[83] In this case, since the specific distance is maintained by a repulsive force of the support spacers 136 (of the shaft supporters 135) and the spacing members 134 (of the rotor 133) which are formed as magnets having the same polarity, an operation can be started with a small driving force by minimizing friction generated in an initial operation, thereby suppressing loss of a driving force due to start of the operation.

[84] Further, although the support spacers 136 and the spacing members 134 have N poles in the drawings of the present invention, they may have S poles to provide the same effect of generating a repulsive force due to the same polarity. Accordingly, the present invention is not limited to the N poles shown in the drawings.

[85] As described above, when power is applied to the electromagnet 138 to start the operation of the rotor 133 by an electromotive force, the operation of the rotor 133 is started without friction or rotation interference while the specific distance is maintained by a repulsive force of the support spacers 136, serving as magnets having polarity at the shaft supporters 135, and the spacing members 134, serving as magnets having the same polarity at corresponding positions of the rotor 133, thereby rotating the rotation shaft 132. The impeller 121 coupled to the rotation shaft 132 through the rotation coupling hole 122 is rotated in the pumping space 112 toward the inlet port 118 of the pumping partition wall 113 to press the inlet water introduced into the inlet port 118.

[86] In this case, the inlet ports 118 are formed as a plurality of through holes at the shaft supporters 135 supporting the rotor 133 such that inlet water is introduced to reduce friction of the rotor 133, thereby improving rotation efficiency.

[87] When the impeller 121 is rotated, inlet water introduced into the pumping space 112 is pressed by an eddy generated while the impeller wings 123 formed in the impeller 121 are rotated. Then, the pressed hot water is discharged to the discharge port 116 formed at one side of the pumping space 112, and the hot water flows into a hot water supply line 13 to circulate in a hot water circulation line 12 formed in a mat 11, thereby performing heating. When the heating is finished, the hot water returns to the hot water tank 21 through a hot water discharge line 14. That is, while the hot water is circulated, heating is performed.

[88] Further, according to another embodiment of the present invention, first, inlet water

is introduced into the pumping space 112 through the inlet hole 118b of the inlet port 118 of the pump body 110. The electromagnet 138 is operated to press the introduced inlet water.

[89] When the rotor 133 is rotated by an electromotive force of the electromagnet 138, the impeller 121 which is integrally coupled with the rotor 133 and the support rotation shaft 124 is rotated.

[90] In this case, the rotation shaft 132 supporting the rotation is disposed to be inserted into the support space 125 which is an inner space of the support rotation shaft 124 which is integrally coupled with the rotor 133 and the impeller 121.

[91] In this case, the rotation shaft 132 is installed to have one end fixed to the inlet fixing member 118a and the other end fixed to the shaft fixing member 139a.

[92] Further, in the support space 125 of the support rotation shaft 124 supported by the rotation shaft 132, the impeller support bush 127 is disposed at the impeller 121 and the rotation support bush 126 is installed at the rotor 133, thereby improving a supporting force.

[93] As described above, when the support rotation shaft 124 supported by the rotation shaft 132 is rotated to rotate the impeller 121, the inlet water in the pumping space 112 is pressed by the impeller wings 123 disposed at the outer periphery of the impeller 121 and is converted into pressed water.

[94] In this case, the inlet support spacer 118c serving as a magnet having polarity is disposed at the inlet port 118 and the impeller spacing member 128 serving as a magnet having opposite polarity is disposed at the impeller 121 of the support rotation shaft 124, thereby preventing the impeller 121 from being in contact with the inlet port 118 in the rotation by a magnetic repulsive force.

[95] Further, the rotation spacing member 129 serving as a magnet having polarity is disposed at the rotor 133 of the support rotation shaft 124 and the rotation support spacer 139b serving as a magnet having opposite polarity is disposed at the rotor of the shaft fixing member 139a, thereby preventing the rotor 133 from being in contact with the shaft fixing member 139a in the rotation by a magnetic repulsive force.

[96] According to still another embodiment of the present invention, a rotation support shaft 139, supporting the support rotation shaft 124, includes an impeller stopper 139c which is protrudingly formed between the impeller 121 and the inlet port 118, and a rotor stopper 139d which is protrudingly formed between the rotor 133 and the shaft fixing member 139a, thereby preventing the integrally-formed impeller 121 and rotor 133 from being in contact with the inlet port 118 and the shaft fixing member 139a in the rotation.

[97] The pressed water is discharged through the discharge port 116 to perform a pumping operation.

[98] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Industrial Applicability

[99] In the motor pump according to the embodiments of the present invention, the rotor is operated while the rotor is maintained at a specific distance from the shaft supporters by a repulsive force due to the same polarity between the rotor and the shaft supporters. Accordingly, it is possible to increase rotation efficiency of the motor pump by preventing friction and to increase a life span of the motor pump by minimizing damage and breakage due to friction.