JPH06327182A - Electric motor for well pump - Google Patents

Abstract

PURPOSE:To insert or pull out a cap by a manual operation by a method wherein the tip of a cap-mounting part is formed as a key-shaped stopper and cut parts are formed in several places out of the whole circumference of the mounting part. CONSTITUTION:A key-shaped stopper part is formed at the tip of a mounting part, a size De is formed to be a size which is a little smaller than the size of a hole at the inside-diameter part of an engineering plastic bearing, a size D3 is formed to be a size which is nearly identical to the size, and a size D4 is formed to be a size which is a little larger than the size. In addition, cut parts 7b are formed in several places out of the whole circumference of the mounting part. A cap is inserted by hand, and the tip of the mounting part is narrowed to the side of the inside diameter. The size D4 is first larger than the size of an engineering plastic hole, it is then made gradually small, and it is finally made equal to the engineering plastic hole 3a, and the cap 7 is inserted to the inside of a motor. Then, the size D4 is finally released from an external force in a part where the engineering plastic hole 3a is ended, it is returned to a size which is larger than the initial engineering plastic hole, and the mounting operation of the cap is completed. Once the mounting operation is completed, a stopper 7a is hooked to the engineering plastic hole 3a. As a result, when the title motor is used normally, the stopper is not detached simply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a well pump electric motor, and more particularly to an improvement in the work of inserting and removing a cap for closing an embra hole.

[0002]

2. Description of the Related Art A well pump uses a screw-type impeller, and in order to prevent the rotation of the motor shaft during assembly and disassembly work, a hole is formed in the bearing inner diameter portion of the motor's anti-pump side embra. On the other hand, a groove is generally provided on the shaft end face, and a screwdriver is inserted into this groove to fix the shaft so that it will not rotate, and the impeller is screwed in to assemble and disassemble.

During normal use, the hole in the inner diameter portion of the embra bearing is covered with a cap for safety and waterproof reasons, but conventionally a cap made of steel plate is press-fitted into the embra hole.

[0004]

In the case of the conventional press-fitting method, it takes work man-hours because a press board must be used, and the cap must be removed when disassembling the impeller after pump installation. However, even at this time, it was not easy to remove it because of press fitting, and at worst, there was a problem that it could be deformed or damaged and could not be reused. Therefore, an object of the present invention is to solve the above-mentioned problems and to facilitate the work of inserting and removing the cap.

[0005]

[Means for Solving the Problems] The above-mentioned object is to provide a stopper portion at the tip of the mounting portion by devising the structure, and when the mounting portion is cut into several places and inserted into the embra hole, the mounting portion is located on the inner diameter side. It has elasticity that allows it to be deformed so that it can be inserted by hand, and a groove is formed in the cap for removal work, so that the tip of the driver can be inserted and removed easily, so the cap insertion and removal work can be simplified. It can be achieved.

[0006]

[Function] When inserting into the embra, make a notch so that it deforms to the inner diameter side to facilitate insertion, and once installed, a key-shaped stopper part is provided at the end of the mounting part so that it does not come off easily in normal use. This is possible.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a structural diagram of the main part of a well pump. The motor part is a stator 1, a rotor 2, both embras 3 and 4, which support the rotor, a ball bearing 5, and a shaft 6 which directly connects the pump impeller. , The cap 7 according to the present invention, and the pump portion is composed of the impeller 9 and the casings 10 and 11.

The end of the electric motor shaft 6 on the pump side is generally threaded to make the impeller 9 a female screw, and the impeller 9 is screwed and fixed to the shaft 6.

As described above, since the shaft 6 and the impeller 9 are integrally formed, when the impeller 9 is assembled and disassembled, unless the shaft 6 is fixed by some method, the shaft 6 and the shaft 6 are rotated together and cannot be assembled. Therefore, in order to prevent shaft rotation, a groove 6a with a width of 1.5 mm and a depth of 2 mm is provided on the end surface of the electric motor on the side opposite to the pump, and the impeller 9 is screwed and fixed while inserting and pressing the slotted screwdriver into this groove during assembly. To do. In addition, the same method is used when it is naturally disassembled.

As described above, in the case of the electric motor for a pump, since the shaft end surface of the electric motor is provided with a means for preventing rotation, the inner diameter portion 3a of the embler bearing must be provided with a hole. Further, this hole is covered with a cap 7a because it has a safety problem with respect to a rotating object during normal use and a problem such as rusting of the ball bearing due to infiltration of water into the ball bearing 5.

FIG. 2 is a structural view of a conventional electric motor in which a steel plate cap 8 is press-fitted into the embra bearing inner diameter hole 3a to close the hole.

FIG. 3 is an enlarged view of the cap 8 in which the outer diameter dimension D1 of the cap mounting portion is slightly larger than the inner hole dimension of the embler bearing, and press-fitting work is performed using a press board. For this reason, it takes a lot of man-hours, and when the pump is out of order and the impeller 9 is rotated or removed, the cap 8 must be removed, and the removal work is troublesome, and in the worst case, the cap is deformed or damaged. I was letting it.

Therefore, the present invention provides a cap 7 having a structure which can be easily operated by hand instead of a press-fitting method for facilitating the insertion and withdrawal work of the cap, and can be attached so as not to come off easily during normal use. The work is simplified.

That is, as shown in FIGS. 4 and 5, structurally, there is a key-shaped stopper portion at the tip of the mounting portion, and the D2 dimension is slightly smaller than the embosser bearing inner diameter hole dimension, the D3 dimension is almost the same, and the D4 dimension is The size should be slightly larger.

Notches 7 are provided at several places on the entire circumference of the mounting portion.
Make b. A groove 7c into which a flat-blade screwdriver is inserted is provided on the opposite side of the electric motor. In the case of the present invention, the material is made of resin, but it may be made of rubber or the same steel plate as the conventional one by changing the shape.

The operation will now be described in detail. Insertion is performed by hand. First, since the D2 dimension is smaller than the bore diameter of the embra bearing inner diameter portion, the tip of the cap enters the embra hole 3a. By further applying a force in the insertion direction, since the D2 and D4 dimensions are tapered and there is a notch 7b, the tip of the mounting portion is a bud on the inner diameter side. The D4 dimension was initially larger than the embra hole dimension, but gradually decreased. Finally, the cap 7 is inserted into the motor because it becomes the same as the embra hole 3a. Finally, when the embra hole 3a is cut, the dimension D4 is removed by an external force and returns to a dimension larger than the original embra hole, and the mounting of the cap is completed.

FIG. 6 is an enlarged view of the cap mounting portion, and once the mounting is completed, the stopper 7a is caught in the embra hole 3a, so that it does not easily come off during normal use, and water does not enter the ball bearing 5. The driver 12 can be easily removed by inserting it into the cap groove 7c at the time of removal work without any problem, which simplifies the work and facilitates on-site service work.

[0019]

According to the present invention, the cap can be inserted and removed manually, and the assembling and disassembling work can be simplified.

[Brief description of drawings]

FIG. 1 is a front view in which a pump unit is combined with an electric motor unit of the present invention.

FIG. 2 is a front view of a conventional electric motor.

FIG. 3 is a view showing a front surface and a side surface of a conventional cap.

FIG. 4 is a view showing a front surface and a side surface of the cap of the present invention.

FIG. 5 is a perspective view of a cap.

FIG. 6 is an enlarged view of a cap mounting portion.

[Explanation of symbols]

1 ... Stator, 2 ... Rotor, 3 ... Anti-P side embra, 4 ... P
Side embler, 5 ... Ball bearing, 6 ... Shaft, 7, 8 ... Cap,
9 ... Impeller, 10 ... Casing (1), 11 ... Casing (2), 12 ... Driver.

Claims (1)

[Claims] 1. As a means for closing the embler hole, there is a key-shaped stopper portion at the tip of the mounting portion, and there are several notches so that the mounting portion can be deformed to the inner diameter side when inserted into the embra hole. An electric motor for a well pump characterized by using a cap of a certain structure.