Sewage pump sealing assembly and sewage pump

Abstract

The present invention provides a sewage pump sealing assembly and a sewage pump, relating to the field of water pumps. The sealing assembly includes a pump body, a rotating shaft interspersed in the middle of the pump body, a chamber provided inside the rotating shaft, and a piston slidably provided inside the chamber. Air passages are provided at both ends of the rotating shaft. The upper end of the pump body is fixedly connected to a cover plate, a convex ring is provided at the lower edge of the cover plate, a groove is provided at the upper end of the pump body, and a second airbag ring is placed in the groove. The middle of the lower end of the pump body is fixedly connected to a shaft tube, two sealing rings are sleeved on the lower side wall of the rotating shaft, a first airbag ring is provided between the two sealing rings, and a retaining ring is threadedly connected to the inner wall of the shaft tube. The sealing assembly is used for sewage pumps. A piston is provided inside the rotating shaft. As the piston moves, internal and external pressures are balanced, and the arrangement of the first and second airbag rings is coordinated to improve the sealing performance of the sewage pump.

Description

Technical Field

[0001] The present invention relates to the technical field of water pumps, in particular to a sewage pump sealing assembly and a sewage pump. Background Art

[0002] A water pump is a machine that transports liquids or increases the pressure of liquids. It transfers the mechanical energy of the prime mover or other external energy to the liquid, increasing the liquid's energy. It is mainly used to transport liquids including water, oil, acid and alkali solutions, emulsions, suspensions, and liquid metals.

[0003] As the name suggests, a sewage pump is used to pump sewage. Water pumps are categorized as either submersible or non-submersible. Submersible pumps have their impeller and motor located within the pumped liquid, while non-submersible pumps have their motor drive located near the shore. Sewage pumps are typically submersible, requiring excellent sealing.

[0004] Traditional water pump sealing involves adding seals to the pump body and end caps, the pump body and shaft, and the line inlet. These seals are typically made of flexible materials such as sealing rings, gaskets, and sleeves. The precision of these seals affects the sealing performance. Furthermore, a pressure difference exists between the pump's interior and exterior, causing liquid to flow in or out of the pump. This pressure difference is caused by the depth of the pump and the heat generated during operation, which causes the internal gas to expand due to heat. Furthermore, the pressure difference is uncertain. This pressure difference significantly increases the sealing requirements for the pump. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In view of the deficiencies of the prior art, the present invention provides a sewage pump sealing assembly and a sewage pump, which solves the problem that a pressure difference is generated inside and outside the existing sewage pump, thereby increasing the complexity of the sealing structure.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a sewage pump sealing assembly, comprising a pump body, a rotating shaft is inserted into the middle of the pump body, a chamber is provided inside the rotating shaft, and a piston is slidably provided inside the chamber, and air passages are provided at both ends of the rotating shaft;

[0009] The upper end of the pump body is fixedly connected to a cover plate, and a convex ring is provided on the lower edge of the cover plate. The upper end of the pump body is provided with a groove, and a second airbag ring is placed in the groove. The second airbag ring is an annular tube connected end to end and filled with gas. The convex ring is stuck in the groove and presses against the second airbag ring.

[0010] The middle part of the lower end of the pump body is fixedly connected with a shaft tube, and two sealing rings are sleeved on the lower side wall of the rotating shaft. A first airbag ring is arranged between the two sealing rings. The structure of the first airbag ring is consistent with that of the second airbag ring. A retaining ring is threadedly connected to the inner wall of the shaft tube. The upper end of the retaining ring is located at the lower sealing ring, and the upper end of the sealing ring located at the upper part presses against the pump body.

[0011] Preferably, two O-rings are provided on the side wall of the piston, and the side walls of the O-rings are in contact with the inner wall of the rotating shaft.

[0012] Preferably, an oil chamber is provided inside the piston, an oil outlet is provided on one side of the oil chamber, the oil outlet is located between two O-rings, and an oil inlet is provided at the upper end of the piston.

[0013] A sewage pump comprises the above-mentioned sealing assembly, a sleeve, a base and an impeller, wherein the sleeve is fixed to the lower end of the pump body, the impeller is fixed to the lower part of the rotating shaft, the impeller is located inside the sleeve, and the base is fixed to the lower end of the sleeve.

[0014] Preferably, the inner wall of the pump body is fixedly connected to a stator, the side wall of the rotating shaft is fixedly connected to a rotor, and the stator and rotor are nested.

[0015] Preferably, a water outlet pipe is fixedly connected to the side wall of the sleeve, and a flange structure is provided at one end of the water outlet pipe.

[0016] Preferably, the lower portion of the base is trumpet-shaped, and through holes are distributed on the arc-shaped side surfaces.

[0017] Preferably, a handle is fixedly connected to the middle portion of the upper end of the cover plate, and a cable is provided on one side of the handle.

[0018] Preferably, the upper and lower side walls of the rotating shaft are both provided with bearings, the bearing located at the lower part is fixed on the pump body, and the bearing located at the upper part is fixed on the cover plate.

[0019] (3) Beneficial effects

[0020] The present invention provides a sewage pump sealing assembly and a sewage pump, which have the following beneficial effects:

[0021] 1. The present invention provides a slidable piston inside the rotating shaft. As the piston slides, the pressure inside and outside the pump body can be balanced, so that the internal and external pressures remain consistent, eliminating the tendency of liquid to enter or discharge the pump body caused by the pressure difference, thereby reducing the complexity of the water pump sealing structure.

[0022] 2. The present invention is provided with a first airbag ring and a second airbag ring, which deform under pressure, so that the side walls of the first airbag ring and the second airbag ring can fully contact the sealing surface, thereby improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0024] Figure 2 It is a top view schematic diagram of the present invention;

[0025] Figure 3 It is a cross-sectional schematic diagram of the present invention;

[0026] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0027] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0028] Figure 6 for Figure 3 Enlarged view of point C in the middle.

[0029] Among them, 1. base; 2. water outlet pipe; 3. sleeve; 4. pump body; 5. cover plate; 6. handle; 7. cable; 8. impeller; 9. bearing; 10. rotating shaft; 11. stator; 12. rotor; 13. retaining ring; 14. shaft tube; 15. first airbag ring; 16. sealing ring; 17. air duct; 18. piston; 19. O-ring; 20. oil inlet; 21. oil chamber; 22. oil outlet; 23. convex ring; 24. second airbag ring. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example:

[0032] like Figure 1-6As shown, an embodiment of the present invention provides a sewage pump sealing assembly, including a pump body 4, which is cylindrical. A rotating shaft 10 is inserted in the middle of the pump body 4, a chamber is provided inside the rotating shaft 10, and a piston 18 is slidably provided inside the chamber, that is, the position of the piston 18 can be changed, and air channels 17 are provided at both ends of the rotating shaft 10. The air channel 17 located at the upper part is connected to the interior of the pump body 4, and the air channel 17 located at the lower part is connected to the outside of the pump body 4, that is, the pumped liquid can enter the interior of the rotating shaft 10. This type of water pump usually works underwater, and with respect to sealing performance, if there is a pressure difference between the inside and outside of the pump body 4, that is, there is a tendency for the fluid to enter or discharge the pump body 4, the greater the pressure difference, the greater the test of the sealing quality of the water pump. A piston 18 is provided here. When the internal and external pressure difference is inconsistent, the piston 18 will be pushed to balance the internal and external pressure difference, eliminating the tendency of the fluid to enter or discharge the pump body 4. Under the premise of ensuring the sealing performance of the water pump, the sealing structure of the water pump is simplified.

[0033] The upper end of the pump body 4 is fixedly connected to a cover plate 5, which is used to seal the upper end of the pump body 4. A convex ring 23 is provided on the lower edge of the cover plate 5. The upper end of the pump body 4 is provided with a groove, and a second airbag ring 24 is placed in the groove. The second airbag ring 24 is an annular tube connected end to end and filled with gas. The second airbag ring 24 is made of flexible material and can be deformed. The convex ring 23 is stuck in the groove and presses against the second airbag ring 24. When the cover plate 5 is closed, the convex ring 23 presses and squeezes the second airbag ring 24. The side wall of the second airbag ring 24 fits tightly against the inner wall of the groove, and under the deformation of the second airbag ring 24, the sealing in all directions is guaranteed.

[0034] The middle part of the lower end of the pump body 4 is fixedly connected with a shaft tube 14, and two sealing rings 16 are sleeved on the lower side wall of the rotating shaft 10. A first airbag ring 15 is arranged between the two sealing rings 16. The structure of the first airbag ring 15 is consistent with the structure of the second airbag ring 24, and in terms of function, the first airbag ring 15 and the second airbag ring 24 are consistent. After being compressed and deformed, they are in full contact with the sealing surface to improve the sealing performance. The inner wall of the shaft tube 14 is threadedly connected with a retaining ring 13. The upper end of the retaining ring 13 is located at the lower sealing ring 16, and the upper end of the upper sealing ring 16 is against the pump body 4. The retaining ring 13 is used to limit the position of the sealing ring 16 and the first airbag ring 15.

[0035] Two O-rings 19 are provided on the side walls of the piston 18 . The side walls of the O-rings 19 are in contact with the inner wall of the rotating shaft 10 , thereby improving the sealing performance between the piston 18 and the rotating shaft 10 .

[0036] An oil chamber 21 is provided inside the piston 18, and an oil outlet 22 is provided on one side of the oil chamber 21. The oil outlet 22 is located between the two O-rings 19. The grease in the oil chamber 21 can enter between the two O-rings 19 from the oil outlet 22 during the rotation of the rotating shaft 10, further improving the sealing of the piston 18 and reducing the sliding resistance of the piston 18. An oil inlet 20 is provided at the upper end of the piston 18 for replenishing grease into the oil chamber 21. A one-way valve can be provided at the oil inlet 20 to prevent grease from overflowing from the oil inlet 20 during the operation of the sewage pump.

[0037] A sewage pump includes the above-mentioned sealing assembly, as well as a sleeve 3, a base 1 and an impeller 8. The sleeve 3 is fixed to the lower end of the pump body 4, and the impeller 8 is fixed to the lower part of the rotating shaft 10. The impeller 8 is located inside the sleeve 3. The sleeve 3 is used to protect the impeller 8, and a relatively sealed chamber is provided at the impeller 8 to realize fluid transportation during the rotation of the impeller 8. The base 1 is fixed to the lower end of the sleeve 3 to support the upper structure.

[0038] The inner wall of the pump body 4 is fixedly connected to the stator 11, and the side wall of the rotating shaft 10 is fixedly connected to the rotor 12. The stator 11 and the rotor 12 are nested. After the sewage pump is energized, the stator 11 and the rotor 12 rotate relative to each other, thereby driving the rotating shaft 10 to rotate and driving the impeller 8 to rotate to pump water.

[0039] The side wall of the sleeve 3 is fixedly connected to the water outlet pipe 2, and one end of the water outlet pipe 2 is provided with a flange structure for connecting to the water delivery pipe.

[0040] The lower part of the base 1 is trumpet-shaped, and through holes are distributed on the arc-shaped side. When the lower part of the base 1 is blocked, sewage can also be sucked in from the through holes provided on the side wall of the base 1.

[0041] A handle 6 is fixedly connected to the middle of the upper end of the cover plate 5 for transferring the sewage pump. A cable 7 is provided on one side of the handle 6 for powering the sewage pump.

[0042] The upper and lower side walls of the rotating shaft 10 are both provided with bearings 9 . The lower bearing 9 is fixed to the pump body 4 , and the upper bearing 9 is fixed to the cover plate 5 , so as to reduce the rotation friction of the rotating shaft 10 .

[0043] Working principle: When in use, place the sewage pump in the sewage and power it on. The impeller 8 rotates and sucks in sewage from the lower end of the casing 3 and pumps out the sewage from the outlet pipe 2. During the process, if the internal pressure of the pump body 4 and the external pressure are unbalanced, the piston 18 arranged inside the rotating shaft 10 moves and balances the internal and external pressures, that is, offsets the tendency of the fluid to enter or discharge the pump body 4 caused by the pressure difference. When the internal and external pressures are consistent, the complexity of other sealing structures of the pump body 4 can be reduced.

[0044] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A sewage pump sealing assembly, characterized in that: The pump comprises a pump body (4), a rotating shaft (10) is inserted in the middle of the pump body (4), a chamber is provided inside the rotating shaft (10), a piston (18) is slidably provided inside the chamber, and air passages (17) are provided through both ends of the rotating shaft (10); The upper end of the pump body (4) is fixedly connected to a cover plate (5), and a convex ring (23) is provided on the lower edge of the cover plate (5). The upper end of the pump body (4) is provided with a groove, and a second airbag ring (24) is placed in the groove. The second airbag ring (24) is an annular tube connected end to end and filled with gas. The convex ring (23) is stuck in the groove and abuts against the second airbag ring (24). The middle part of the lower end of the pump body (4) is fixedly connected with a shaft tube (14), and the lower side wall of the rotating shaft (10) is sleeved with two sealing rings (16). A first airbag ring (15) is provided between the two sealing rings (16). The structure of the first airbag ring (15) is consistent with the structure of the second airbag ring (24). The inner wall of the shaft tube (14) is threadedly connected with a retaining ring (13). The upper end of the retaining ring (13) is located at the lower sealing ring (16), and the upper end of the sealing ring (16) is located at the upper part and abuts against the pump body (4).

2. A sewage pump sealing assembly according to claim 1, characterized in that: Two O-rings (19) are provided on the side wall of the piston (18), and the side walls of the O-rings (19) are in contact with the inner wall of the rotating shaft (10).

3. A sewage pump sealing assembly according to claim 2, characterized in that: An oil chamber (21) is provided inside the piston (18), an oil outlet (22) is provided on one side of the oil chamber (21), and the oil outlet (22) is located between two O-rings (19). An oil inlet (20) is provided at the upper end of the piston (18).

4. A sewage pump, characterized in that: The invention comprises a sealing assembly according to any one of claims 1 to 3, a sleeve (3), a base (1) and an impeller (8), wherein the sleeve (3) is fixed to the lower end of the pump body (4), the impeller (8) is fixed to the lower part of the rotating shaft (10), the impeller (8) is located inside the sleeve (3), and the base (1) is fixed to the lower end of the sleeve (3).

5. A sewage pump according to claim 4, characterized in that: The inner wall of the pump body (4) is fixedly connected to a stator (11), and the side wall of the rotating shaft (10) is fixedly connected to a rotor (12), and the stator (11) and the rotor (12) are nested.

6. A sewage pump according to claim 4, characterized in that: The side wall of the sleeve (3) is fixedly connected to a water outlet pipe (2), and one end of the water outlet pipe (2) is provided with a flange structure.

7. A sewage pump according to claim 4, characterized in that: The lower part of the base (1) is trumpet-shaped, and through holes are distributed on the arc-shaped side surfaces.

8. A sewage pump according to claim 4, characterized in that: A handle (6) is fixedly connected to the middle portion of the upper end of the cover plate (5), and a cable (7) is provided on one side of the handle (6).

9. The sewage pump according to claim 4, characterized in that: The upper and lower side walls of the rotating shaft (10) are both provided with bearings (9), the bearing (9) located at the lower part is fixed on the pump body (4), and the bearing (9) located at the upper part is fixed on the cover plate (5).

Images