JPS5930603Y2 - underwater electric motor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a bracket fixing device for a submersible electric motor, such as a canned type submersible electric motor.

First, a fixing device for a bracket in a conventional canned submersible electric motor will be explained.

In FIG. 1 A 2 ports and FIG. 2 A 2 ports, 1 is a fixed frame, 2 is an end plate, and has a fitting hole 2A in which the cable connector 3 is fitted in a watertight manner.

4 is a can, 5 is a bracket, and a power supply cable 6
It has a hole 5A into which it is watertightly inserted, and a plurality of through holes 5B through which a plurality of tightening bolts 7 pass.

Therefore, each tightening bolt 7 is inserted into each screw hole 2B of the end plate 2.
The bracket 5 is fixed by screwing into the bracket.

A rotor shaft 8 is supported by a bracket 5 via a sleeve bearing 9.

10 is a shaft sealing device, and 11 and 12 are sealing members.

As described above, since the bracket 5 is fixed by the tightening bolt 7, due to the play between the tightening bolt 7 and the through hole 5B, the bracket 5 rotates together with the shock when the rotor shaft 8 starts. However, there is a possibility that twisting force may be applied to the power supply cable 6.

Therefore, cracks may occur in the external waves of the power supply cable 6, leading to poor insulation.

For this reason, the conventional method, as shown in Fig. 2 A,
A rotation prevention pin 13 fitted in the pin hole 2C of the end plate is provided, and a pin insertion hole 14 is provided in the bracket 5, and by fitting these two, the rotation of the bracket 5 is prevented. .

However, according to this anti-rotation method, it is necessary to machine the pin hole 2A and the pin insertion hole 14, respectively.
This requires extra machining time and extra time to assemble the pin 13, which has the disadvantage of increasing manufacturing costs.

This invention was made in order to eliminate such drawbacks, and includes a plurality of screw holes formed in the axial direction on the circumference and a first through hole formed between the plurality of screw holes. a stator frame having a hole at its end; a plurality of second through holes in the axial direction that are fitted into the inner periphery of the end of the stator frame and opposite to the plurality of screw holes; a bracket having a third through hole in the axial direction opposite to the through hole; the bracket is threaded through each of the plurality of second through holes and screwed into the plurality of screw holes; a plurality of tightening bolts coupled to the ends of the cable, a cable connector fitted into the first through hole, and a cable connector inserted into the third through hole and connected to the cable connector. - one of the plurality of second through holes is provided with a pull;
The diameter of the hole is smaller than that of the other second through holes, and the tightening bolt is tightly fitted into the second through hole having the smaller diameter, and the bracket is attached to the stator frame. By providing rotation prevention, it is possible to prevent the bracket from rotating without installing a rotation prevention pin, reducing the number of parts, and providing an underwater electric motor that prevents damage to the power supply cable with an extremely simple configuration. It is something to do.

The figures will be explained below.

That is, as shown in FIG. 3, A2, in this invention, among the plurality of tightening bolt through holes 5B provided in the bracket 5, at least one through hole 5B' has a smaller diameter than the other through holes. Moreover, it is formed to have a significantly larger diameter than the tightening bolt 7.

When assembling, if you want to connect the bracket 5 to the end plate 2, insert the power supply cable 6 into the hole 5A of the bracket 5, then insert the tightening bolt 7 into the small diameter through hole 5'' and tighten it into the same hole. Screw it into 2B.

As a result, the bracket 5 is prevented from rotating relative to the end plate 2, and the other through hole 5B and the other screw hole 2B are aligned.

In addition, since the other through holes 5B are configured to be smaller than the small diameter through hole 5B', even if an error occurs in the mechanical accuracy of the interval between the through holes 5B' or the interval between the tapped holes 2B. The through hole 5B and screw hole 2B can be easily matched.

As described above, this invention provides a fixing device having a plurality of screw holes formed in the axial direction on the circumference and a first through hole formed between the plurality of screw holes at the end. child frame,
a plurality of second through holes in the axial direction that are fitted into the inner end portion of the stator frame and are opposed to the plurality of screw holes;
a bracket having a third through hole in the axial direction opposite to the first through hole; A plurality of tightening bolts coupled to the end of the stator frame, a cable connector fitted into the first through hole, and a cable connector inserted into the third through hole and connected to the cable connector. A cable is provided, and among the plurality of second through-holes, the diameter of ■ holes is smaller than the other second through-holes, and the fastener is inserted into the second through-hole having the smaller diameter. Since the bolts are tightly fitted together to prevent the bracket from rotating relative to the stator frame, the bracket can be prevented from rotating without the need to provide a rotation stopper pin as required in the past, and the number of parts is reduced compared to conventional ones. This has the effect of reducing the number of points and eliminating the need for machining such as pin holes.

Moreover, in cases where the power supply cable passes through the bracket without any play, such as an underwater motor, the bracket must be securely prevented from rotating, so damage to the power supply cable can be prevented with an extremely simple configuration, which is extremely practical. There is.

Furthermore, since the hole diameter of only one of the through holes is smaller than the other through holes, pitch errors due to machining are relatively likely to occur, such as the spacing between the through holes 5B and the spacing between the screw holes 2B. Even if there is, the other through holes can be easily matched with the screw holes, and an effective rotation prevention effect can be obtained without making assembly work difficult.

[Brief explanation of drawings]

Figure 1A and Figure 2A and Figure 2A and Tama are drawings related to the conventional type. 3A and 3B are a side view of the vicinity of the bracket in an actual example of this invention, and a sectional view taken along the B-B line. Note that the same reference numerals in the figures indicate the same parts. 1 is the stator frame, 2 is the fitting hole, 2B is the screw hole, 3
is a cable connector, 5 is a bracket, 5A is a hole, 5B 5B' is a tightening bolt through hole, 6 is a power supply cable, and 7 is a tightening bolt.

Claims (1)

[Scope of utility model registration request] A stator frame having at its end a plurality of screw holes formed in the axial direction on the circumference and a first through hole formed between the plurality of screw holes; It has a plurality of second through holes in the axial direction that are fitted to the inner periphery of the end portion and are opposed to the plurality of screw holes, and a third through hole in the axial direction that is opposite to the first through holes. a bracket, a plurality of tightening bolts that pass through the plurality of second through holes and are screwed into the plurality of screw holes to couple the bracket to the end of the stator frame; a cable connector fitted in the through hole of the through hole, and a power supply cable inserted into the third through hole and connected to the cable connector, and one hole of the plurality of second through holes. The diameter of the second through hole is smaller than that of the other second through hole, and the tightening bolt is tightly fitted into the second through hole having the smaller diameter, thereby preventing the bracket from rotating relative to the stator frame. An underwater electric motor characterized by: