JPH0427786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a single-phase submersible electric motor that is used while being immersed in well water or the like.

[Prior art]

A conventional single-phase submersible motor of this type will be explained with reference to FIGS. 1 and 2. In the figure, 1 is a stator consisting of a stator core 2 and a stator winding 3 wound around the stator core 2, and 4 is a resin mold made of polyester resin or vinyl ester resin for molding the stator 1. 4a is a bottomed hole provided at one end of the frame 4; 4b is provided at one end of the frame 4 and is formed at a position approximately symmetrical to the bottomed hole 4a. A bottomed hole 5 is a thin cylindrical can made of stainless steel that is bonded to the inner peripheral surface of the stator core 2 and the frame 4;
Reference numeral 6 denotes a bracket molded from a resin mold material that is screwed to one end of the frame 4, and 6a is a bottomed hole formed on the frame 4 side of the bracket 6, which is coaxial with the bottomed hole 4a. It is set in. 6b is a bottomed hole formed on the frame 4 side of the bracket 6, and is provided on the same axis as the bottomed hole 4b. 6c is a through hole that communicates the outer end surface of the bracket 6 with the bottomed hole 6a, 7 is a rotor core that pairs with the stator core 2, and 8 is a rotating shaft fitted into the inner peripheral surface of the rotor core 7. The child shaft is rotatably supported at one end by a bracket 6 via a cylindrical bearing 9.
protrudes from the outer end surface of. Reference numeral 10 denotes a drainer fitted to a protruding portion of the rotor shaft 8 from the outer end surface of the bracket 6, and one end surface is configured to come into sliding contact with the outer end surface of the bracket 6. Reference numeral 11 denotes a water seal member consisting of an oil seal fitted to the inner circumferential surface of the bracket 6, 12 a stator side male connector molded inside the bottomed hole 4a, and 13 both ends facing the stator side. The lead wire 14 connected to the male connector 12 and the stator winding 3 is fitted into the bottomed holes 4a, 6a and connected to the pin-shaped contact 12a of the stator side male connector 12. A power supply side female connector 15 has one end connected to the power supply side female connector 14, and a power supply cable 16 that passes through the through hole 6c and has the other end connected to a ground power source (not shown). Bracket 6 is a starting switch unit elastically housed in the provided storage hole 6d, 17 is a male connector for the starting switch unit molded inside the bottomed hole 4b, and 18 is connected to the bottomed hole 4b. A female connector 19 for the start switch unit is fitted into the bottom hole 6b, and 19 is the bottom hole 6b.
The male connector 20 for the starting switch unit is molded in the deep part of the starting switch unit, and 20 is the male connector 18 for the starting switch unit and the male connector 1 on the stator side.
A lead wire connecting the two is molded in the frame body 4. The starting switch unit 16 and the starting switch unit male connector 19 are connected. In addition, the pin-shaped contacts 1 of each of the male connectors 17 and 19 for the starting switch unit
7a and 19a are respectively connected to a female connector 18 for an actuation switch unit. Furthermore, four screws 21 are embedded in the frame 4 and open on the side of the connection surface with the bracket 6, so that a fastening member (not shown) between the bracket 6 and the frame 4 is screwed together. being done.

Since the conventional single-phase submersible motor is constructed as described above, the starting switch unit 16 must be housed in the bracket 6, and as the starting switch unit 16 becomes larger, the bracket 6 also becomes larger. It had some drawbacks. In addition to the stator side male connector 12, male connectors 17 and 19 for the starting switch unit are molded onto the bracket 6 and the frame 4, and female connectors 18 for the starting switch unit are fitted into the bottomed holes 6b and 4b. There was a flaw that needed to be addressed. Further, there is a drawback that positioning work of the male connectors 17 and 19 is required during molding, making the molding work difficult. Furthermore, when the frame body 4 and the bracket 6 are screwed together, the work of connecting the female connector 14 on the power supply side and the male connector 12 on the stator side and the work of connecting the connectors 17, 18, 19 for the starting switch unit are performed. Since this is necessary, the work of joining the frame body 4 and the bracket 6 is time consuming and has the drawback of poor workability. Further, the start switch unit connector 19 and the stator side male connector 12 are connected by a lead wire 20, and the lead wire 20 is connected to the frame body 4.
This work also had the disadvantage of poor workability because it was molded into a mold. Further, since the starting switch unit 16 is housed in the bracket 6, there is a drawback that it may malfunction due to thermal or magnetic influences of the single-phase motor.

As described above, the conventional single-phase submersible motor has a complicated structure and a large number of parts, and has major drawbacks such as high cost and poor reliability due to poor workability.

[Summary of the invention]

This invention was made in an attempt to solve these drawbacks.The starting switch unit is made into an integrated circuit to significantly reduce the size, and it is housed in a watertight manner between the power supply cables, and is detachable from the motor body, thereby improving the structure. It is an object of the present invention to provide a single-phase submersible electric motor that can simplify the process, improve the workability of disassembling and assembling, and prevent malfunctions of the start switch.

[Embodiments of the invention]

Figures 3 to 5 show an embodiment of the present invention. Figure 3 is a partial cross-sectional view, Figure 4 is a partial cross-sectional view showing the start switch unit housed on the power supply cable side, and Figure 5 is an electrical It is a wiring diagram. In the figure, 6
d is a notch hole formed on the outer end side of the bracket 6, and 6e is a through hole provided in the bracket 6, communicating with the notch hole 6d. 6f is bracket 6
The four through holes provided in the four screws 21 face each other. Numeral 22 attaches the bracket 6 to the frame 4 using tightening bolts that pass through the four through holes 6f and have one end screwed into the four screws 21, respectively.
It is screwed together. Reference numeral 14 denotes a power supply side connector connected to the power supply cable 15, one end of which is watertightly fitted into the bottomed hole 4a and connected to the stator side male connector 12, and the middle part of which passes through the through hole 6a. The end portion is loosely fitted into the notch hole 6d. In addition, in FIG. 5, 23 and 24 are the main winding and auxiliary winding of a single-phase motor, 16 is a starting switch unit integrated into an integrated circuit, 25, 26, and 27 are surge absorber elements, 28 is a grounding wire, and 29 is a It is an AC power source. Reference numeral 31 denotes an intermediate connecting member, and the starting switch unit 16 is housed in the inner circumference of the intermediate connecting member in a watertight manner with a water sealing member 32 made of resin or the like injected and solidified. Note that the start switch unit 16 is connected to the power supply cables 15, 33.
It is connected to the. 34 is the power supply side connector 14
The plate is connected to the bracket 6 and is fixed by screws (not shown). Note that the power supply cable 14 is housed in the inner peripheral portion of the power supply side connector 14 in a watertight manner with a water sealing member 30 such as a resin injected into the power supply side connector 14 and solidified.

Next, another embodiment will be explained with reference to FIGS. 6 and 7.
In the figure, 35 is a surge absorber element 25,
26 and 27 and a grounding wire 28, which is housed in an intermediate connection member 31 in a watertight manner with a water seal member 32. Incidentally, a lightning protection means 35 is connected to the power supply cable 15, and a starting switch unit 16 is connected to the lightning protection means 35.

In a device configured in this way, in the event of a lightning strike, the lightning surge will be transferred to the power supply cable 33.
→Lightning protection means 35→Enter the intermediate connection member 31, but the lightning protection means 35 connects to the starting switch unit 16 and the stator side connector 12 of the power supply connector 14.
Since it is disposed closer to the power supply cable 33 than the connection part with the starting switch unit 16, the starting switch unit 16 and the electric motor are not damaged at all because they are grounded from the intermediate connecting member 31 before entering the starting switch unit 16. Other operations are well known and will not be explained.

In this configuration, since the starting switch unit and the lightning arrester are completely separate from the motor body, the starting switch unit and the lightning arrester can be repaired and replaced easily and quickly. Also,
Even in the event of a lightning strike, there is no damage to the start switch unit and the electric motor, resulting in excellent practical effects such as being economically superior.

Further, in this embodiment, the frame body 4 and the bracket 6 are molded with a resin mold material made of polyester resin or vinyl ester resin, but the present invention is not limited to this embodiment. It may be made of a steel pipe or a steel plate, and the bracket 6 may be made of cast iron.

〔Effect of the invention〕

As explained above, the present invention connects the stator side connector connected to the stator winding to the inner peripheral part of the frame, is detachably connected to the stator side connector, and is connected to the power supply cable. A structure in which a lightning protection means connected to a power supply cable and a start switch unit connected to this lightning protection means are collectively housed in a watertight manner at one location on the inner periphery of a power supply side connector or in the vicinity of the power supply side connector. This simplifies the structure and improves the workability of disassembling and assembling, resulting in low manufacturing costs and extremely easy handling. Further, since the starting switch unit is not affected by the thermal or magnetic effects of the electric motor and is constantly cooled by external liquid, it is highly reliable without malfunction. Further, since the starting switch unit and the lightning arrester are completely separate from the motor body, the starting switch unit and the lightning arrester can be repaired and replaced easily and quickly. Furthermore, even in the event of a lightning strike, the starting switch unit and the electric motor will not be damaged at all, resulting in excellent practical effects such as being economically superior.

In addition, a stator side connector connected to the stator winding is connected to the inner peripheral part of the frame, and a power supply side connector connected to the stator side connector and connected to the power supply cable is connected to the stator side connector in a detachable manner. If the lightning protection means connected to the power supply cable and the activation switch unit connected to the lightning protection means are housed together in a watertight manner at one location on the periphery or near the power supply side connector, the activation switch Because the unit and lightning protection means are completely separate from the motor body, the starting switch unit
Repair and replacement work of lightning protection means can be easily and quickly performed. Furthermore, even in the event of a lightning strike, the start switch unit and the electric motor will not be damaged at all, resulting in excellent practical effects such as being economically superior.

[Brief explanation of drawings]

Figures 1 and 2 show a conventional single-phase submersible electric motor, with Figure 1 being a partial sectional view, Figure 2 being a plan view of the frame, and Figures 3 to 5 showing one part of the invention. Fig. 3 is a partial sectional view, Fig. 4 is a sectional view of the power supply side connector, Fig. 5 is an electrical connection diagram, Fig. 6 is a sectional view showing another embodiment, and Fig. 7 is a sectional view of the embodiment. is its circuit diagram. In the figure, 1 is a stator, 4 is a frame body, 6 is a bracket, 12 is a stator side connector, 14 is a power supply side connector, 15 and 33 are power supply cables, 16 is a start switch unit, 30, .
2 is a water sealing member, 31 is an intermediate connecting member, and 35 is a lightning protection means. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A frame that surrounds and supports the stator, a stator-side connector that is coupled to the inner periphery of the frame and is connected to the stator, and a stator-side connector that can be detachably attached to the stator-side connector. A power supply side connector made of a conductive material that is connected and coupled to the power supply cable, a lightning protection means connected to the power supply cable, and a start switch unit connected to the lightning protection means are watertightly housed between the power supply cables, and A single-phase submersible motor with an earth protection means grounded to the power supply side connector. 2. The single-phase submersible motor according to claim 1, wherein the power supply side connector is supported by a bracket.