CN110529398A - The explosion-proof sewage dirt submersible pump of oil immersed type - Google Patents

Abstract

The oil-immersed explosion-proof sewage and sewage submersible pump has a motor and a pump body. The upper end of the motor casing is seated with an upper bearing seat, and the lower end is connected with a lower bearing seat. The lower bearing seat is connected with the pump body. The motor shaft is composed of an upper bearing seat and a lower bearing. Seat support, the motor shaft is connected with the impeller shaft, a leather cup is fixed in the top cap connected to the upper end of the motor case, and a water inlet cavity is formed between the cup and the top cap, and the cup connects the inner cavity of the motor case with the water inlet cavity Insulation, the top cap has drainage holes, the first sealing sheath passes through the cup and the top cap, the top cap is connected with a top cover, the top cover is equipped with a second sealing sheath, and the coil leads of the motor pass through through the first sealing sheath, and the power line passes through the second sealing sheath to connect with the coil lead wire. During operation, when the temperature of the motor rises, the leather cup deforms, its inner cavity increases, and the water inlet cavity decreases, and the water in the water inlet cavity is discharged through the drain hole, thereby reducing the pressure in the motor casing. , the deformation of the leather cup is restored, and the external water enters the water inlet cavity through the drain hole.

Description

Oil-immersed explosion-proof sewage and sewage submersible pump

technical field

The invention relates to the technical field of water pumps, in particular to an oil-immersed explosion-proof sewage submersible pump.

Background technique

The oil-immersed sewage submersible pump has the advantages of low temperature rise and long life. In order to prevent water from entering the motor cavity in the existing oil-immersed sewage submersible pump, the sealing method adopted is to seal the upper end of the motor casing with an upper bearing cover, and connect a top cap with a wiring cavity on the upper bearing. The upper bearing isolates the inner cavity of the motor casing from the wiring cavity, and a sealing sheath is worn on the upper bearing cover, and the coil leads of the motor pass through the sealing sheath and connect with the external power line in the wiring cavity. The problem with this existing sealing method is that under normal use, the pressure inside the motor casing is small, but when encountering abnormal conditions such as heavy workload and power shortage, the temperature of the motor will rise too fast, which will cause The expansion of cooling oil and air will increase the pressure inside the motor casing. When the pressure reaches the unbearable level of the motor casing, it will burst, cause accidents, and cause water pollution, property loss and other problems.

Contents of the invention

The object of the present invention is to provide an oil-immersed explosion-proof submersible pump for sewage and dirt, which can depressurize when the pressure in the motor casing of the submersible pump increases.

In order to achieve the above object, the present invention adopts the following scheme: the oil-immersed explosion-proof submersible sewage pump has a motor and a pump body, the upper end of the motor casing of the motor is seated with an upper bearing seat, and the lower end of the motor casing is connected with a lower bearing seat, The lower bearing seat is connected with the pump casing of the pump body. The motor shaft of the motor is supported by the upper bearing seat and the lower bearing seat. The motor shaft is connected with the impeller shaft in the pump casing. An elastic leather cup is fixed, the inner cavity of the leather cup communicates with the inner cavity of the motor casing, and the water inlet cavity is formed between the outer surface of the leather cup and the top cap, and the leather cup isolates the inner cavity of the motor casing from the water inlet cavity , the side wall of the top cap is provided with a drainage hole connecting the water inlet chamber with the outside world, the bottom of the cup and the top wall of the top cap pass through a first sealing sheath, and the upper end of the top cap is connected with a top cover , a wiring cavity is formed between the top cover and the top cap, the upper end of the top cover is equipped with a second sealing sheath, the coil leads of the motor pass through the first sealing sheath and enter the wiring cavity, and the power cord enters through the second sealing sheath The wiring cavity is connected with the lead wire of the coil.

It can be seen from the above scheme that when the oil-immersed explosion-proof sewage and sewage submersible pump provided by the present invention is in operation, when the temperature of the motor rises, the cooling oil and air inside the motor casing expand, and the leather cup is squeezed outward. The bowl is elastic, the leather bowl is deformed, its inner cavity is enlarged, and the water inlet cavity is reduced. At the same time, the water in the water inlet cavity is discharged through the drain hole on the top cap, thereby reducing the pressure inside the motor casing. When the temperature of the motor drops , when the cooling oil and air pressure inside the motor casing drop, the deformation of the leather cup recovers, and the external water enters the water inlet cavity through the drain hole; in addition, the setting of the leather cup makes the inner cavity of the motor casing ideally isolated from the water inlet cavity, Make sure that external water cannot enter the motor.

The invention has reasonable structure, reliable performance, ideal explosion-proof performance and long service life.

Description of drawings

Fig. 1 is the structural representation of an embodiment of the present invention;

Fig. 2 is the structural representation of leather cup in the embodiment shown in Fig. 1;

Fig. 3 is a sectional view of the cup shown in Fig. 2;

FIG. 4 is a cross-sectional view along line AA of FIG. 3 .

Detailed ways

The present invention will be further described below through specific embodiments and accompanying drawings.

See Figure 1

The oil-immersed explosion-proof sewage submersible pump provided by the present invention has a motor 9 and a pump body 11, and the motor 9 has a motor casing 9d, a motor shaft 9a, a rotor 9c, and a coil 9b. The upper end of the motor casing 9d is seated with an upper bearing seat 8, the lower end of the motor casing 9d is connected with a lower bearing seat 10, the lower bearing seat 10 is connected with the pump casing of the pump body 11, and the motor shaft 9a is composed of the upper bearing seat 8, the lower bearing seat 10 support, the motor shaft 9a is connected with the impeller shaft in the pump body 11. The connection between the motor shaft 9a and the impeller shaft is an existing structure, which is not shown in Fig. 1 . The upper end of the motor housing 9d is connected with a top cap 6, and an elastic leather cup 7 is fixed inside the top cap 6. The material of the leather cup 7 is rubber, and the upper bearing seat 8 is provided with a port 8a. The inner cavity of the leather cup 7 It communicates with the inner cavity of the motor casing 9d through the port 8a, and forms a water inlet cavity 12 between the outer surface of the leather cup 7 and the top cap 6, and the leather cup 7 isolates the inner cavity of the motor casing 9d from the water inlet cavity 12, The side wall of the top cap 6 is provided with a drainage hole 6a for communicating the water inlet chamber 12 with the outside world. A first sealing sheath 5 passes through the bottom of the cup 7 and the top wall of the top cap 6, the upper end of the top cap 6 is connected to a top cover 1, and a wiring cavity 13 is formed between the top cover 1 and the top cap 6, The upper end of the top cover 1 is equipped with a second sealing sheath 2, the coil lead wire 4 of the motor enters the wiring cavity 13 through the first sealing sheath 5, and the power line 3 enters the wiring cavity and the coil lead wire through the second sealing sheath 2. 4 connected.

In this embodiment, the mouth of the cup 7 has a flange 7b protruding outward, and the flange 7b is clamped by the top cap 6 and the motor housing 9d, and the bottom of the cup 7 is connected to the top wall of the top cap 6. There is a through hole 7a in the middle part of the bottom of the leather cup 7, and the middle part of the top wall of the top cap 6 has a boss 6b, and the boss 6b stretches into the through hole 7a in the bottom of the bowl, and the boss 6b has a threading hole. The first sealing sheath 5 is installed in the threading hole.

See Figure 2, Figure 3, Figure 4

In this embodiment, the bowl wall of the leather cup 7 has more than two dimples 7c sinking into the inner cavity of the leather bowl along the circumferential direction. The dimples 7c make the inner and outer surfaces of the bowl wall of the leather bowl 7 uneven. By adopting this structure, the deformation coefficient of the cup can be increased, and the deformation rate thereof can be increased, thereby enabling better decompression.

In this embodiment, the surface 7d of the dimple on the cup 7 is gradually inclined outward along the direction from the bottom of the bowl to the mouth of the bowl. With this structure, the effect achieved is that the mud contained in the sewage entering the water inlet chamber 12 can flow out smoothly along the outer surface 7d of the pit, and will not stay in the pit 7c.

Claims (4)

1. The oil-immersed explosion-proof sewage and sewage submersible pump has a motor and a pump body. The upper end of the motor casing of the motor is seated with an upper bearing seat, and the lower end of the motor casing is connected with a lower bearing seat. The lower bearing seat is connected with the pump casing of the pump body. , the motor shaft of the motor is supported by the upper bearing seat and the lower bearing seat, and the motor shaft is connected with the impeller shaft in the pump casing. It is characterized in that: the upper end of the motor casing is connected with a cap, and an elastic leather cup is fixed in the top cap , the inner cavity of the leather cup communicates with the inner cavity of the motor casing, the outer surface of the leather cup and the top cap form a water inlet cavity, the leather cup isolates the inner cavity of the motor casing from the water inlet cavity, and the side wall of the top cap There is a drainage hole connecting the water inlet chamber with the outside world. A first sealing sheath passes through the bottom of the cup and the top wall of the top cap. The upper end of the top cap is connected with a top cover. A wiring cavity is formed between them, the upper end of the top cover is equipped with a second sealing sheath, the coil leads of the motor pass through the first sealing sheath and enter the wiring cavity, and the power wires pass through the second sealing sheath and enter the wiring cavity to communicate with the coil leads. catch. 2. The oil-immersed explosion-proof sewage and sewage submersible pump according to claim 1, characterized in that: the mouth of the leather bowl has a flange protruding outward, and the flange is clamped by the top cap and the motor casing, and the leather bowl The bottom of the bowl is connected with the top wall of the top cap. There is a through hole in the middle of the bottom of the leather bowl. There is a threading hole, and the first sealing sheath is arranged in the threading hole. 3. The oil-immersed explosion-proof sewage submersible pump according to claim 1, characterized in that: the bowl wall of the cup has more than two pits sinking into the inner cavity of the cup along the circumference, and the pits make the cup The inner surface and the outer surface of the bowl wall of the bowl are uneven. 4. The oil-immersed explosion-proof sewage and sewage submersible pump according to claim 3, characterized in that: the outer surface of the pit on the leather bowl is gradually inclined outward along the direction from the bottom of the bowl to the mouth of the bowl.