WO2003048579A2 | 2003-06-12 |
KR20020032169A | 2002-05-03 | |||
KR20010008997A | 2001-02-05 | |||
JPH06280763A | 1994-10-04 | |||
JPH05164070A | 1993-06-29 |
Claims
[1] A motor- integrated type screw pump, which includes a case having inlet and outlet flanges formed at both sides thereof and connected with introduction and discharge pipes adapted to introduce and discharge a fluid; a stator attached on the inner circumferential surface of the case and having magnetic poles; an exciting coil type rotor arranged at the center of the stator and spaced apart from the stator at a predetermined interval to thereby perform a reciprocal action with the stator; a rotary shaft pipe axially mounted to the center of the rotor and operated in cooperation with, the rotary shaft pipe extending to a side of each flange of the case in such a way as to be connected with the introduction and discharge pipes; and a driving screw disposed inside the rotary shaft pipe, wherein the rotary shaft pipe includes an inner pipe to which the driving screw is forcedly fit, and an outer pipe adapted to surround the inner pipe in such a way as to be spaced apart from the inner pipe at a predetermined interval, the outer pipe having vent holes formed at both ends thereof, and wherein the case includes vent holes formed at both sides thereof, and wherein an air blast fan is mounted between the inner pipe and the outer pipe to thereby suck and discharge air through the vent holes of the case.
[2] The motor- integrated type screw pump according to claim 1, wherein the inner pipe of the rotary shaft pipe has fitting protrusions longitudinally formed on the inner circumferential surface thereof at regular intervals, and the driving screw is constructed such that a plurality of separated screw bodies are connected with one another, each separated screw body including a post of a predetermined length and a spiral blade formed integrally with the outer circumferential surface of the post, the spiral blade having fitting slits formed thereon so as to allow the fitting protrusions of the inner pipe to be forcedly fit thereto when the driving screw is inserted into the inner pipe.
[3] The motor-integrated type screw pump according to claim 1 or 2, wherein the case includes: a tubular body; and inlet and outlet covers coupled to both ends of the body, each of the inlet and outlet covers having a bearing formed therein so as to rotatably support the rotary shaft pipe, a vent hole formed at a side thereof, and a flange formed thereon so that the respective flanges of the inlet and outlet covers are coupled to each other via a screw member. |
Description
SCREW PUMP
Technical Field
[1] The present invention relates to a motor-integrated type screw pump, and more particularly, to a motor-integrated type screw pump, which performs a cooling action by forcedly introducing the outdoor air thereto when a driving screw rotates, and which allows a number of the driving screws with a standardized size to be connected to each other in multiple stages to thereby easily use the driving screw according to a designed volume of the pump. Background Art
[2] In general, a pump refers to a device which continuously supplies energy to a fluid by a driving force provided from the outside, and can move the fluid from a low place to a high place or raise a low pressure to a high pressure according to use methods thereof.
[3] That is, typically, the pump is actuated by a motor, such as an electric motor or a combustion engine, to provide a mechanical energy to the fluid, and is classified into a turbo pump, a positive-displacement pump, a specialized pump, and so on according to the operational principle and structure. The turbo pump is divided into a centrifugal pump, a diagonal flow pump, an axial flow pump, and so on, and the positive-displacement pump is divided into a reciprocating pump and a rotary pump.
[4] In addition, such pumps are classified and manufactured into pumps of various kinds according to their use purposes and are used in various industrial fields. Now, a structure of an electric storage pump, which is most widely used, will be described as follows.
[5] The conventional electric storage pump includes: a motor case located on a side of a motor for generating a driving force by an operation of a rotor, the motor case having a suction pipe, a discharge pipe, an impeller and a swirl chamber; and a power transmitting means, such as gears or pulleys, adapted to connect the rotor of the motor and an impeller shaft of the motor case with each other. In engagement of the above components, first, when the rotor of the motor is rotated by the external electric energy, a rotational force of the rotor is transmitted to the impeller through the power transmitting structure by the gears and the pulleys, and the impeller is rotated at a high speed inside the swirl chamber by the transmitted rotational force to thereby suck a fluid material from a suction pipe and discharge it through a discharge pipe.
[6] However, the conventional electric storage pump has a problem in that it is complicated in carrying and installation and expensive since it includes the motor
adapted to generate the driving force and the motor case provided with the driving force from the motor. In addition, the conventional electric storage pump has another problem in that it is greatly deteriorated in efficiency since it causes an unnecessary power loss and an instable slip through a connected portion between the motor and the motor case while the driving force of motor is transmitted to the motor case.
[7] In the meantime, recently, in order to solve the problems of the conventional electric storage pump, a motor-integrated type screw pump, in which the rotor of the general motor is used as a fluid conveying means having a driving screw embedded therein to thereby convey the fluid using only the motor.
[8] Korean Patent Application No. 10-1999-27113 discloses a motor comprising a motor device embedded therein, the motor device having a rotor and a fixed exciting coil located inside a casing, wherein flange pipes are extendedly coupled to both sides of the casing and a shaft pipe having a driving screw embedded therein is mounted at the axial center of the rotor inside the flange pipe.
[9] However, since the motor-integrated type screw pump according to the prior art has the structure that the driving screw of a predetermined length is coupled integrally to the inside of the through hole type shaft pipe, the screw pump has a problem in that the structure causes a rotational interference of the driving screw. Furthermore, because it is very difficult to mount the driving screw, when the screw pump is out of order or damaged, the screw pump is deteriorated in production, assembly and maintenance, such as repair and exchange of components, and maintenance fees are very expensive since the driving screw and the shaft pipe must be exchanged together with the shaft pipe when the driving screw is damaged or worn away.
[10] Furthermore, a long-term operation of the motor- integrated type screw pump causes deterioration in performance and reduction of the lifespan by heat generation. Disclosure of Invention Technical Problem
[11] Accordingly, the present invention has been made in an effort to solve the above- mentioned problems occurring in the prior arts, and it is an object of the present invention to provide a motor-integrated type screw pump, which can be operated in cooperation with a driving screw when the driving screw so as to forcedly suck and cool the outdoor air, thereby guaranteeing a stable efficiency. It is another object of the present invention to provide a motor-integrated type screw pump, which can construct the driving screw in a standardized size so as to easily use a number of the driving screws according to a volume of the screw pump. Technical Solution
[12] To achieve the above objects, the present invention provides a motor-integrated
type screw pump, which includes a case having inlet and outlet flanges formed at both sides thereof and connected with introduction and discharge pipes adapted to introduce and discharge a fluid; a stator attached on the inner circumferential surface of the case and having magnetic poles; a rotor disposed at the center of the stator in such a way as to be spaced apart from the stator at a predetermined interval, the rotor having an exciting coil to thereby perform a reciprocal action with the stator; a rotary shaft pipe axially mounted to the center of the rotor and operated in cooperation with, the rotary shaft pipe extending to a side of each flange of the case in such a way as to be connected with the introduction and discharge pipes; and a driving screw disposed inside the rotary shaft pipe, wherein the rotary shaft pipe includes an inner pipe to which the driving screw is forcedly fit, and an outer pipe adapted to surround the inner pipe in such a way as to be spaced apart from the inner pipe at a predetermined interval, the outer pipe having vent holes formed at both ends thereof, and wherein the case includes vent holes formed at both sides thereof, and wherein an air blast fan is mounted between the inner pipe and the outer pipe to thereby suck and discharge air through the vent holes of the case.
[13] In addition, the inner pipe of the rotary shaft pipe has fitting protrusions longitudinally formed on the inner circumferential surface thereof at regular intervals, and the driving screw is constructed such that a plurality of separated screw bodies are connected with one another, each separated screw body including a post of a predetermined length and a spiral blade formed integrally with the outer circumferential surface of the post, the spiral blade having fitting slits formed thereon so as to allow the fitting protrusions of the inner pipe to be forcedly fit thereto when the driving screw is inserted into the inner pipe.
[14] Furthermore, the case includes: a tubular body; and inlet and outlet covers coupled to both ends of the body, each of the inlet and outlet covers having a bearing formed therein so as to rotatably support the rotary shaft pipe, a vent hole formed at a side thereof, and a flange formed thereon so that the respective flanges of the inlet and outlet covers are coupled to each other via a screw member.
[15] The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description of the preferred embodiments of the invention in conjunction with the accompanying drawings. Terms and words used in this specification and claims should be interpreted as the meaning and concept conforming to the technical idea of the present invention based on the principle that the inventor can properly define the concept of the terms to explain the inventor's invention in the best way.
Advantageous Effects
[16] Since the outdoor air is introduced into the pump and discharged to the outside by the air blast fan when the rotary shaft pipe having a double-pipe structure is rotated, the motor-integrated type screw pump according to the present invention having the above structure and operation can prevent deterioration in performance due to heat generation by suppressing restraining a rise of the inside temperature to thereby enhance reliability of the product.
[17] In addition, since the driving screw includes a plurality of separated screw bodies, the motor-integrated type screw pump is easy to assemble and disassemble to thereby enhance productivity and repair/maintenance and makes the mass production possible to thereby provide a standardized quality of the product and reduce manufacturing costs. Brief Description of the Drawings
[18] FIG. 1 is a sectional view showing a configuration of a motor-integrated type screw pump according to the present invention.
[19] FIG. 2 is an exploded perspective view for explaining the configuration of the motor-integrated type screw pump according to the present invention.
[20] FIG. 3 is a sectional view of a rotor shaft pipe of the motor-integrated type screw pump according to the present invention.
[21] <Explanation of essential reference numerals in drawings>
[22] 1: pump 3: case
[23] 5: stator 7: rotor
[24] 10: rotary shaft pipe 11 : inner pipe
[25] 13: outer pipe 20: driving screw
Mode for the Invention
[26] The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description of the preferred embodiments of the invention in conjunction with the accompanying drawings.
[27] Terms and words used in this specification and claims should be interpreted as the meaning and concept conforming to the technical idea of the present invention based on the principle that the inventor can properly define the concept of terms to explain the inventor's invention in the best way.
[28] Reference will be now made in detail to the preferred embodiment of the present invention with reference to the attached drawings.
[29] FIG. 1 is a sectional view showing a configuration of a motor-integrated type screw pump according to the present invention, FIG. 2 is an exploded perspective view for explaining the configuration of the motor- integrated type screw pump according to the present invention, and FIG. 3 is a sectional view of a rotor shaft pipe of the motor-
integrated type screw pump according to the present invention.
[30] As shown in the drawings, the motor- integrated type screw pump according to the present invention includes a case 3 for providing a space, in which various components are mounted; a stator 5 and a rotor 7 disposed inside the case 3; a rotary shaft pipe 10 shaft- mounted on the rotor 7 to be rotated in cooperation with the rotor 7 and having a double-pipe type structure; a driving screw 20 slidably fit inside the rotary shaft pipe 10; and an air blast fan 30 mounted in the rotary shaft pipe 10 at an end of the driving screw 20 for forcedly introducing the outdoor air into the case 3 to thereby restrain a rise of the inside temperature of the case 3.
[31] The case 3 has a structure that flanges, which are connected with pipes adapted for introducing and discharging a fluid, are coupled to both sides of the case 3. The case 3 includes a tubular body 3a, and an inlet cover 3b and an outlet cover 3c mounted on both opened sides of the body 3a via screw members (not shown).
[32] In this instance, the inlet and outlet covers 3b and 3c are formed in a generally conical shape, and at least one bearing (b) for rotatably supporting the rotary shaft pipe 10, which will be described later, is mounted on each of the inlet and outlet covers 3b and 3c. On a side of the inlet cover 3b and a side of the outlet cover 3c, respectively formed are through-hole type vent holes hi and h2 of a predetermined size adapted to forcedly suck and discharge the outdoor air when the air blast fan 30 operates to blow the air.
[33] In the meantime, it would be understood that the vent holes hi and h2 are an inlet and an outlet of a flow channel formed by an inner pipe 11 and an outer pipe 13.
[34] Referring to FIG. 1, an inlet flange (IP) is coupled to the outer surface of the inlet cover 3b of the case 3, which is located at the right of the FIG. 1, via a screw member (not shown), and in this instance, the inlet flange (IP) is connected to an introduction pipe (pi) for supplying a fluid.
[35] In addition, an outlet flange (OP) is coupled to the outer surface of the outlet cover 3c of the case 3 via a screw member (not shown), and in this instance, the outlet flange (OP) provides a flow channel for discharging the fluid passing through a pump 1. As shown in the drawings, sealing members S2 are respectively interposed on a contact surface formed between the inlet flange (IP) and the inlet cover 3b and on a contact surface formed between the outlet flange (OP) and the outlet cover 3c to thereby keep a sealability therebetween. Here, since the sealing can be realized by the well-known technology, its detailed description will be omitted.
[36] Moreover, the connection structure of the inlet flange (IP) and the outlet flange
(OP) connected to the case 3 of the pump can be realized by the well-known technology, its detailed description will be omitted.
[37] The unexplained reference numeral 3 designates a support of the case 3.
[38] The stator 5 is attached on the inner circumferential surface of the case 3 and has magnetic poles, and the rotor 7 is an exciting coil, which is spaced apart from the inner circumferential surface of the stator 5 at a predetermined interval and performs a reciprocal motion with the stator 5. The rotor 7 performs a one-way rotation when electric power is supplied to the stator 5 and the rotor 7.
[39] Since the stator 5 and the rotor 7 are actuated by a well-known motor, their detailed description will be omitted.
[40] The rotary shaft pipe 10 is a hollow type rotating member, which is shaft- fit to the center of the rotor 7 to be rotated in cooperation with the rotor 7. Moreover, the rotary shaft pipe 10 extends to sides of the flanges to be connected with the introduction and discharge pipes pi and p2.
[41] The double-pipe type rotary shaft pipe 10 of a predetermined length includes the inner pipe 11 connected with the introduction and discharge pipes pi and p2, and the outer pipe 13 adapted to surround the inner pipe 11 and spaced apart from the inner pipe 11 at a predetermined interval. The outer circumferential surface of the outer pipe 13 is forcedly fit to the inner circumferential surface of the rotor 7.
[42] Meanwhile, the inner pipe 11 has fitting protrusions 11' longitudinally arranged on the inner circumferential surface thereof at regular intervals and protruding in a triangular section form. In this instance, the fitting protrusions 11 ' are provided to forcedly fit separated screw bodies 21 of the driving screw 20 with one another.
[43] In addition, as shown in the drawing, the outer pipe 13 surrounds the inner pipe
11 and is shorter than the inner pipe 11.
[44] The outer pipe 13 has inflow and outflow vent holes 13hl and 13h2 respectively formed at both ends thereof, and in this instance, the inflow and outflow vent holes 13hl and 13h2 are formed by coupling the air blast fan 30 between the inner pipe 11 and the outer pipe 13 through welding.
[45] In the meantime, the unexplained referenced numeral si designates sealing members surrounding both ends of the inner pipe 11 to thereby keep sealability in a state where they are forcedly fit with the inlet and outlet covers 3b and 3c. Here, since the sealing can be realized by the well-known technology, its detailed description will be omitted.
[46] The driving screw 20 can be completed in such a way as to connect a plurality of separated screw bodies 21 with one another, and is forcedly fit to the inner pipe 11 and rotated in cooperation with the inner pipe 11 to thereby forcedly convey the fluid in one direction.
[47] In the meantime, each separated screw body 21 of the driving screw 20 includes a bar-type post 21a of a predetermined length, and a spiral blade 21b spirally formed on the outer circumferential surface of the post 21a. In this instance, as shown in FIG.
2, the spiral blade 21b has fitting slits 21b' longitudinally formed thereon in correspondence with the size and form of the fitting protrusions 11'.
[48] The driving screw 20 is completely assembled in such a way that a plurality of separated screw bodies 21 are inserted into the inner pipe 11 of the rotary shaft pipe 10 in order. In this instance, the driving screw 20 is inserted only in a state where the fitting slits 21b' of the spiral blade 21b are adjusted in their locations in such a way as to allow the fitting protrusions 11 ' formed on the inner circumferential surface of the inner pipe 11 to be forcedly fit thereto.
[49] The air blast fan 30 includes a number of rotating blades mounted between the inner pipe 11 and the outer pipe 13 of the rotary shaft pipe 10. The rotating blades are respectively weld-bonded on the outer circumferential surface of the inner pipe 11 and on the inner circumferential surface of the outer pipe 13, and in this instance, mounted on at least one place of the rotary shaft pipe 10 in the longitudinal direction of the rotar y shaft pipe 10.
[50] It would be appreciated that the air blast fan 30 can be properly changed in its form and location if it could be rotated in cooperation with the rotary shaft pipe 10 when the rotary shaft pipe 10 is rotated to generate wind. Since the air blast fan 30 can be realized by the well-known technology, its detailed description will be omitted.
[51] In the meantime, a number of the air blast fans 30 are arranged and mounted along the rotary shaft pipe 10 at regular intervals to introduce the outdoor air to the pump and send it in one direction while being rotated. That is, when the rotary shaft pipe 10 is rotated, the outdoor air is forcedly introduced into the screw pump through the inflow vent hole hi of the case 11 by an air blast action of the air blast fans 30. The introduced air passes through the flow channel formed by a space between the inner pipe 11 and the outer pipe 13, and then, is discharged to the outside through the outflow vent hole h2 to thereby lower surrounding temperature of the rotary shaft pipe 10, namely, to perform a cooling action.
[52] While the present invention has been described with reference to the particular illustrative embodiment, it is not to be restricted by the embodiment but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiment without departing from the scope and spirit of the present invention.
[53] So, it is to be appreciated that such modifications and amendments can belong to the scope of the appended claims of the present invention.