2. Description of the Related Art Generally, it is necessary to use a water pump for the sake of moving the fluid such as the water or the oil from any place to other place. However, a conventional water pump has a retainer assembled at both sides of an impeller. Here, the above retainer prevents the fluid such the water or the oil which penetrates the water pump from being leaked out to the exterior of the water pump as well as supports the axis. However, since the retainer has not good durability, it can use for the long time. Accordingly, according as the retainer becomes to be tired and old, the fluid penetrating the water pump is leaked out. Also, since the retainer operates the friction force to the axis, the load is generated and consumption of the energy is generated. Further, when the retainer becomes old, the vibration and the noise are caused in the case of rotating the axis. As well, water leakage is generated. Therefore, an old retainer must be frequently replaced with a new retainer and at this time, the water pump must be stopped, so that it is not economic to use it. That is, the conventional water pump has many problems in that it is not economic on account of several reasons as described above, the pumping efficiency is lowered, and the water leakage is caused accordingly. Also, the conventional water pump uses the impeller made of casting. Thus, it has many problems in that the weight of the impeller is heavy, the consumption of the energy is increased, the number of vanes of the impeller is less than six, and the pumping efficiency is not excellent. Furthermore, since the conventional water pump uses heavy impeller, the durability of the retainer is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS A more complete appreciation of this invention, many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings, in which like reference symbols indicate the same or similar elements components, wherein, FIG. 1 is a side view for reference according to the present invention; FIG. 2 is a sectional view illustrating the construction of the present invention ; FIGs. 3 and 4 are sectional views illustrating lines 1-1 and 2-2 of FIG. 2 ; FIG. 5 is a separated side view illustrating impeller according to the present invention ; and, FIG. 6 is a side view illustrating a bearing holder according to the present invention.

SUMMARY OF THE INVENTION It is therefore an object of the present invention for solving the above problems to provide a water pump using no retainer.

It is another object of the present invention to provide a water pump using an impeller assembled with iron plate instead of an impeller made of casting.

These and other objects can be achieved according to the present invention with a water pump using no retainer, comprising: a first casing including a plurality of coils fixed at the interior thereof and a first protrusion unit formed at one side; a second casing including a second protrusion unit for supporting a bearing at one side thereof, a cylindrical unit connected with the second protrusion unit, a discharge pipe formed at an opposite portion and made of nonmagnetic iron, and assembled with the first casing by a bolt ; an axis having a core inserted into the cylindrical unit of the second casing ; an impeller foxed by the bolt while inserting into the casing ; a third casing including a suction pipe, and assembled by the bolt and the nut ; and, bearing holder which is assembled in the third casing and supported by the bearing hole for engaging the bearing DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be in detail explained with reference to the accompanying drawings. Further, in the following description, the necessary description for understanding the present invention are set forth to provide a more thorough understanding of the present invention. It is noted that a detailed description of known functions and constructions unnecessarily obscuring the subject matter of the present invention has been omittèd in the following description for clarity.

FIG. 1 is a side view for reference according to the present invention, where first, second, and third casings is cylindrical, totally. A discharge pipe is protruded at the upper portion of the second casing and a suction pipe is formed at the side surface of the third casing, thereby being capable of sucking the fluid. Also, the first, second, and third casings are assembled by bolts or bolts and nuts with one another.

FIG. 2 is a sectional view illustrating the construction of the present invention, where a coil 12, an axis 40, and a core 41 have the construction similar to/same as that of a conventional motor and an impeller 50 is assembled at the axis like the construction of the conventional motor. However, the present invention has characteristics including no retainer. That is, while being only supported by bearings 42 and 43, the axis 40 is rotated. Also, the bearing 42 is fixed at the inside of the second casing and the bearing 43 is fixed at a bearing holder 60 assembled at the inside of the third casing. The bearings and the bearing holder are fixed by snapping, naturally.

The second casing is made of the nonmagnetic iron such as brass or bronze and plays the role on making the magnetic field between the core 41 and the coil 12. Here, now that there exists no tarnish on the nonmagnetic iron by the fluid such as the water flowing in the second casing, the durability of the present invention can be improved. Meanwhile, it is regardless to make the first casing and the third casing of the nonmagnetic iron.

It is preferable to make the impeller 50 of the present invention of stainless plate having less than lmm thickness. Also, the thickness of a side plate 51a having a boss 53a formed thereon is preferably thicker than that 51 positioned in opposite portion. A vane 54 of FIGs. 5 and 2 and two side plates 51 and 51a are assembled with one another by riveting method and the length of the vanes 54 is long and short, that is, various. Further, the vanes 54 are assembled by ones in turn. Now that the impeller made as stated previously has very light weight than the casting material and the number of the vanes are very many, the pumping efficiency is shaped excellently in comparison with the casting material in the range of being supplied with the equal energy.

The bearing holder 60 according to the present invention comprises outer wheel and inner wheel as shown in FIG. 6 and the bearing 43 is fixed at the inner wheel. Furthermore, a plurality of holes 64 are formed between the inner wheek and the outer wheel and the fluid inflowed through the suction tube of one third casing is passed As explained hereinbefore, when the power supply is applied to the present invention, the axis 40 is rotated. Therefore, the fluid for example the water is sucked through the suction pipe 31 and a hole 64 of the bearing holer, as well as discharged in a cylindrical unit 21 of the second casing and the protrusion unit 22. At the same time of that, the fluid is conveyed through the discharge pipe 23 of the second casing by the rotation of the impeller. That is, while the fluid inflowed into the third and second casings are all contacted to the impeller, the axis, the core, the bearing, and the bearing holder, the axis and the core are rotated in the fluid. This corresponds to the constructive features of the present invention using no retainer.

As may be apparent from the foregoing, the present invention has the construction for pumping while rotating the axis, the core, and the impeller in the fluid without any retainer. Therefore, since the present invention uses on retainer and uses the impeller where the friction force is not applied to the axis, the weight is light, and the pumping efficiency is good, the pumping efficiency is increased in contrast with the conventional water pump as well as there are little water leakage. Conclusively, because the durability of the pump is largely improved and the noise and the vibration generated by the abrasion of the retainer are nearly removed, the driver can drive the car safely.

While there have been illustrated and described what are considered to be preferred embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made, and equivalents may be substituted for elements thereof without departing from the true scope of the present invention. In addition, many modifications may be made to adapt a particular situation to the teaching of the present invention without departing from the central scope thereof.

Therefore, it is intended that the present invention not be limited to the particular embodiments disclosed as the best mode contemplated for carrying out the present invention, but that the present invention includes all embodiments falling within the scope of the appended claims.