Double-suction double-row positive displacement rotor pump

Abstract

A double-suction double-discharge positive displacement rotor pump comprises pump bodies, a main shaft and a rotor, the two pump bodies are arranged in a bilateral symmetry mode and connected with each other, each pump body is composed of a main body and a pump cover, and a water inlet hole and a water outlet hole are symmetrically formed in the upper portion of each pump body. A C-shaped working cavity is formed in a main body of each pump body, the two ends of each C-shaped working cavity are communicated with a water inlet hole and a water outlet hole respectively, rotors are eccentrically installed on the main shaft through eccentric sleeves and bearings respectively, the eccentric directions of the rotors are opposite, and C-shaped sleeves on the rotors are inserted into the working cavities respectively. The outer ends of the rotors are respectively connected with rotor glands; quincunx inner teeth are arranged on the inner edge of a limiting sleeve fixed in the pump cover, quincunx outer teeth are arranged on a limiting disc fixed on the outer edge of the rotor, and the quincunx outer teeth are eccentrically meshed with the inner teeth; sealing rubber discs are arranged between the two ends of each pump body and the rotor and the rotor gland respectively, and a plurality of circles of rubber sealing ribs are arranged on the sealing rubber discs. The pump has the advantages of being good in sealing effect, high in working efficiency, long in service life, capable of eliminating pulsation and good in pressurizing effect.

Description

Technical Field

[0001] This utility model relates to a water pump, and more particularly to a double-suction double-discharge positive displacement rotor pump. Background Technology

[0002] As is well known, a swaying positive displacement rotor pump, or simply swaying pump, consists of a stationary pump body and a moving rotor. Power is input from the main shaft to drive the rotor to sway, which changes the volume of the pump chamber. On the side of the rotor that is in contact with the liquid, energy is applied directly to the liquid in the form of static pressure, and the liquid is discharged by the squeezing action of the rotor during swaying. At the same time, a low pressure is formed in the space on the other side, which continuously draws the liquid into the pump body.

[0003] CN206439178U discloses a oscillating positive displacement high-pressure water pump, including a pump body and a rotor mounted in the pump body via an eccentric shaft. The pump body has inlet and outlet water holes. The outer edge of the rotor is tangent to the inner wall of the working chamber of the pump body. Side plates are symmetrically arranged on both sides of the rotor on the eccentric shaft. End caps are respectively provided on both sides of the pump body. One end of the eccentric shaft is led out from one end cap and connected to a power source. A sliding pair and a rotating pair are provided between the upper end of the outer edge of the rotor and the inner wall of the pump body, so that the rotor can oscillate within the working chamber under the drive of the eccentric shaft. An oil injection hole is provided radially in the middle of the upper end of the pump body. Lubricating oil passages communicating with the oil injection hole are provided on the sliding pair and the rotating pair.

[0004] This type of oscillating water pump can effectively improve pump efficiency, achieve sufficient lubrication of sliding and rotating parts, resulting in good lubrication, low mechanical wear, and long service life. However, it has the following problems during operation:

[0005] 1. Oil-water separation is achieved by combining the O-ring seal between the outer end face of the side plate and the pump body end cover and the mechanical seal between the pump body end cover and the eccentric shaft. However, leakage is prone to occur under high pressure conditions, which not only reduces pump efficiency but also shortens the service life of the bearing.

[0006] 2. By providing a sliding pair and a rotating pair connected between the upper outer edge of the rotor and the inner wall of the pump body, the rotor makes a yaw motion in the working chamber under the drive of the eccentric shaft, and the sliding pair and the rotor divide the single working chamber into a high-pressure zone and a low-pressure zone. This not only results in a complex structure, high manufacturing cost, and inconvenient installation, but also causes pulsation in the discharged water flow, poor stability, and a tendency to cause continuous impact on the inside and outside of the pump body, leading to pump failure and affecting the pressurization effect. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a double-suction double-row positive displacement rotor pump with good sealing effect, high working efficiency, long service life, ability to eliminate pulsation, and good pressure boosting effect.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A double-suction, double-displacement positive displacement rotor pump includes a pump body, within which a main shaft and rotors are mounted. The pump body comprises two pump bodies arranged symmetrically and connected to each other. Each pump body consists of an outer main body and an inner pump cover. A water inlet and a drain are symmetrically arranged on the upper part of each pump body. A C-shaped working chamber is provided within the main body of each pump body, with both ends of the working chamber communicating with the water inlet and drain, respectively. The rotors are eccentrically mounted on the main shaft via eccentric sleeves and bearings, with the eccentricity directions of the two rotors being opposite. The C-shaped sleeves on each rotor are inserted into their respective working chambers, allowing the rotors to reciprocate within the working chambers under the drive of the main shaft. Rotor covers are connected to the outer ends of the rotors.

[0010] Compensating inner sleeves are vulcanized on the inner outer wall and outer inner wall of the C-shaped working chamber of each main body. When the rotor moves, the inner and outer edges of the C-shaped sleeve are simultaneously interference-fitted with the compensating inner sleeve in the working chamber and have an inner tangent point and an outer tangent point, so that when the rotor swings in the working chamber, it can alternately achieve suction and drainage through the inner and outer cavities of the C-shaped sleeve to improve the pressure boosting effect.

[0011] A limiting sleeve is fixed inside the pump cover. The inner edge of the limiting sleeve is provided with plum blossom-shaped internal teeth. A limiting disk is fixed on the outer edge of the rotor. The limiting disk is provided with plum blossom-shaped external teeth and eccentrically meshes with the internal teeth to realize the reciprocating swing limit of the rotor.

[0012] Each pump body has a sealing rubber disc between its two ends and the rotor and rotor cover. The sealing rubber disc has multiple corrugated rubber sealing ribs to seal each working chamber.

[0013] As a further preferred embodiment, the rotor is an integral structure consisting of a disc, a central sleeve located at the center of the disc, and a C-shaped sleeve located on one side of the disc.

[0014] As a further preferred option, C-shaped wear-resistant pads are fixed at the bottom of the working cavity of the main body, and the outer end of the C-shaped sleeve rests on the wear-resistant pads to prevent the C-shaped sleeve from wearing during rotor operation.

[0015] As a further preferred embodiment, a double-ring wear-resistant ring is fixed on the main body of each pump body at the inlet of the working chamber. The C-shaped sleeve of the rotor passes through the C-shaped groove on the double-ring wear-resistant ring, and the rotor disc and the limiting disc rest against the outer end face of the double-ring wear-resistant ring to prevent wear between the rotor and the pump body during operation.

[0016] As a further preferred option, deep groove ball bearings are provided at both ends of the eccentric sleeve on the main shaft to prevent axial movement of the eccentric sleeve during operation.

[0017] As a further preferred embodiment, a bearing end cover is fixed to the outer side of the main body of each pump body, and the inner end of the bearing end cover presses against the outer edge of the corresponding sealing rubber disc. The main shaft is installed between the two bearing end covers through a bearing.

[0018] As a further preferred embodiment, rubber caps are fixed on opposite sides of the pump covers of the two pump bodies, with the inner end of the rubber cap pressing against the outer edge of the corresponding sealing rubber disc. The middle part of the main shaft is supported between the two rubber caps by a bearing to improve the stability of the structure.

[0019] As a further preferred embodiment, the inner edge of the sealing rubber disc is respectively secured to the rotor or rotor cover by two retaining rings to prevent the sealing rubber disc from axially moving during operation.

[0020] As a further preferred embodiment, each pump body has a water inlet groove and a water outlet groove symmetrically opened on the upper end of the main body and sealed by an upper cover plate. One end of the circumference of the working chamber is connected to the water inlet hole through the water inlet groove, and the other end is connected to the water outlet hole through the water outlet groove, so as to realize centralized water inlet and drainage.

[0021] As a further preferred embodiment, an inlet seat is provided on the outer side of one of the pump bodies corresponding to the inlet hole, and the inlet seat is connected to the inlet hole for connecting an external inlet pipe; a drain outlet is provided on the upper part of the other pump body, which is perpendicularly connected to the drain hole, and a one-way valve seat and an outlet seat are fixed in sequence at the outer end of the drain outlet, and a one-way valve is provided in the one-way valve seat to facilitate centralized inlet and outlet.

[0022] As a further preferred embodiment, multiple lubrication pillars made of self-lubricating material are evenly distributed around the outer circumference of the C-shaped sleeve to improve the lubrication effect during rotor operation.

[0023] The beneficial effects of this utility model are as follows:

[0024] 1. Because each pump body has a sealing rubber disc between its two ends and the rotor and rotor cover, and the sealing rubber disc has multiple corrugated rubber sealing ribs, when the eccentric sleeve drives the rotor to swing in the working chamber, the sealing rubber disc can deform with the rotor and always wrap around the rotor. Therefore, when the rotor swings, it can effectively seal each working chamber, realize oil-water separation, and avoid leakage problems under high pressure conditions. This not only improves pump efficiency, but also extends the service life of the bearings on the main shaft.

[0025] 2. Since there are two pump bodies arranged symmetrically and connected to each other, each pump body has a water inlet and a water outlet symmetrically arranged on the upper part. The two ends of the working chamber in each pump body are connected to the water inlet and the water outlet respectively. When the rotor is driven by the eccentric sleeve to swing in the working chamber, it generates self-priming force, which distributes the water into the two pump bodies by self-priming, effectively increasing the self-priming efficiency and the load capacity of the pump.

[0026] 3. Because each pump body has a C-shaped working chamber, and the C-shaped sleeve on each rotor is inserted into the corresponding working chamber, the rotor can reciprocate and oscillate within the working chamber under the drive of the main shaft. Through the interference fit between the C-shaped sleeve and the compensating inner sleeve embedded in the working chamber, water can be continuously drawn into the working chamber and discharged between the inner and outer cavities of the C-shaped sleeve. With each rotation of the main shaft, two water intakes and two water discharges can be completed through the inner and outer cavities of the C-shaped sleeve of each rotor. With the rotation of two rotors, four water intakes and four water discharges can be completed, further improving working efficiency. At the same time, the eccentric meshing of the plum blossom-shaped external teeth on the limiting plate with the plum blossom-shaped internal teeth on the inner edge of the limiting sleeve changes the single-point hinge type limiting used in the existing oscillation pump, solving many problems such as the vulnerability and limitation of the limiting structure. The structure is simple, easy to install, and has low manufacturing cost.

[0027] 4. Since the rotors are eccentrically mounted on the main shaft via eccentric sleeves and bearings, and the eccentric directions of the two rotors are opposite, the rotors in the two pump bodies alternately complete the suction and drainage operations during operation, eliminating pulsation, ensuring good stability, and preventing continuous impact of water flow pulsation on the inside and outside of the pump body, which could lead to pump failure. It also provides good pressurization effect; it can achieve high-pressure self-priming, with a maximum pressure of 12 MPa; the maximum vertical suction lift can reach 8 meters; the horizontal suction lift can reach 100 meters; it can achieve long-distance transportation of water and gas mixtures without cavitation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model;

[0029] Figure 2 yes Figure 1 The left view.

[0030] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0031] Figure 4 yes Figure 2 AA sectional view.

[0032] Figure 5 yes Figure 4 BB cross-sectional view.

[0033] Figure 6 yes Figure 4 CC section view.

[0034] Figure 7 yes Figure 4 DD sectional view.

[0035] Figure 8 yes Figure 1 EE sectional view.

[0036] In the diagram: 1. Pump cover; 2. Main body; 3. Rotor; 4. Needle roller bearing; 5. Eccentric sleeve; 6. Deep groove ball bearing; 7. Rotor cover; 8. Bearing; 9. Main shaft; 10. Bearing cover; 11. Snap ring; 12. Sealing rubber disc; 13. Bearing end cover; 14. Double wear-resistant ring; 15. Limiting disc; 16. Limiting sleeve; 17. Rubber cover; 18. Inlet seat; 19. Deep groove ball bearing; 20. Lubrication column; 21. Wear-resistant pad; 22. Inlet hole; 23. Top cover plate; 24. Drain hole; 25. One-way valve seat; 26. One-way valve; 27. Outlet seat; 28. Compensating inner sleeve. Detailed Implementation

[0037] like Figures 1-8 As shown, this utility model relates to a double-suction double-row positive displacement rotor pump, which includes a pump body. A main shaft 9 and a rotor 3 are installed in the pump body. The pump body consists of two pump bodies arranged symmetrically on the left and right and connected to each other by multiple long bolts. Each pump body is composed of a main body 2 located on the outer side and a pump cover 1 located on the inner side of the main body 2. The opposite surfaces of the main body 2 and the pump cover 1 are interlocked by a stop to facilitate positioning.

[0038] Each pump body has a symmetrically arranged inlet hole 22 and outlet hole 24 on its upper part. The inlet hole 22 and outlet hole 24 on the two pump bodies are arranged parallel to the main shaft 9 and are interconnected. Each pump body 2 has a C-shaped working chamber 201 inside its main body 2. The inlet of the working chamber 201 is located at the inner end of the main body 2, and both ends of the working chamber 201 are connected to the inlet hole 22 and outlet hole 24, respectively. The rotors 3 are eccentrically mounted on the main shaft 9 via eccentric sleeves 5 and needle roller bearings 4 fitted on the eccentric sleeves 5, with the eccentric directions of the two rotors 3 being opposite. Rotor caps 7 are fixedly connected to the outer ends of the rotors 3 by evenly distributed screws around their circumference. Deep groove ball bearings 6 are installed on the main shaft 9 at the rotor caps 7 at both ends of the eccentric sleeves 5 and inside the rotors 3, respectively, to prevent axial movement of the eccentric sleeves 5 during operation. The eccentric sleeves 5 are connected to the main shaft 9 via a key.

[0039] Compensating inner sleeves 28 are vulcanized on the outer wall of the inner ring and the inner wall of the outer ring of the C-shaped working cavity 201 of each main body 2. The compensating inner sleeves 28 are made of high molecular weight polyethylene material and are used to enhance the sealing effect between the rotor and the working cavity 201, thereby improving the pressurization effect.

[0040] The rotor 3 is an integral aluminum alloy structure consisting of a disc, a central sleeve at the center of the disc, and a C-shaped sleeve on one side of the disc. The C-shaped sleeve is concentrically arranged with the central sleeve. The C-shaped sleeve on each rotor 3 is inserted into the corresponding working cavity 201, allowing the rotor 3 to reciprocate within the working cavity 201 under the drive of the main shaft 9. When the rotor 3 moves, the inner and outer edges of its C-shaped sleeve are simultaneously interference-fitted with the compensating inner sleeve 28 in the working cavity 201, and have an inner tangent point and an outer tangent point. The inner and outer tangent points are collinear with the axes of the main shaft 9 and the eccentric sleeve 5, so that when the rotor 3 oscillates within the working cavity 201, it can alternately achieve suction and drainage through the inner and outer cavities of the C-shaped sleeve, thereby improving pump efficiency.

[0041] A limiting sleeve 16 is embedded and fixed inside the pump cover 1. The inner edge of the limiting sleeve 16 is provided with plum blossom-shaped internal teeth 161. The disc of the rotor 3 is located inside the corresponding pump cover 1. A limiting disk 15 is sleeved on the outer edge of the disc of the rotor 3 and fixed with screws. The limiting disk 15 is provided with plum blossom-shaped external teeth 151 and eccentrically meshes with the internal teeth 161 to realize the reciprocating swing limiting of the rotor 3.

[0042] C-shaped wear-resistant pads 21 are fixed to the bottom of the working cavity 201 of the main body 2 by screws. The outer end of the C-shaped sleeve rests on the wear-resistant pads 21 to prevent wear of the C-shaped sleeve when the rotor 3 is running. Multiple lubrication pillars 20 made of self-lubricating material are evenly distributed around the outer circumference of the C-shaped sleeve to improve the lubrication effect when the rotor 3 is running.

[0043] On the main body 2 of each pump body, a double-ring wear-resistant ring 14 is fixed with screws at the inlet of the working chamber 201. The double-ring wear-resistant ring 14 has a C-shaped groove and is positioned opposite to the C-shaped working chamber 201. The C-shaped sleeve of the rotor 3 passes through the C-shaped groove on the double-ring wear-resistant ring 14. The disc of the rotor 3 and the limiting disc 15 rest against the outer end face of the double-ring wear-resistant ring 14 to prevent wear between the rotor 3 and the pump body during operation. Both the wear-resistant pad 21 and the double-ring wear-resistant ring 14 are made of wear-resistant material, preferably Nitronic 60.

[0044] Sealing rubber discs 12 are provided at both ends of each pump body, i.e., at the outer ports of the pump cover 1 and the main body 2, and between them and the corresponding rotor 3 and rotor cover 7. Multiple corrugated rubber sealing ribs are provided on the sealing rubber discs 12 to seal each working chamber 201. The inner edge of the sealing rubber discs 12 is secured to the rotor 3 or rotor cover 7 by two retaining rings 11 using external retaining springs to prevent axial movement of the sealing rubber discs 12 during operation.

[0045] Bearing end caps 13 are fixed to the outer side of the main body 2 of each pump body. The inner end of the bearing end cap 13 presses against the outer edge of the corresponding sealing rubber disc 12. The main shaft 9 is mounted between the two bearing end caps 13 through cylindrical roller bearings 8. Bearing pressure caps 10 are fixed to the outer end of the bearing end caps 13 by screws. One end of the main shaft 9 protrudes through the corresponding bearing end caps 13 and bearing pressure caps 10 for connecting to an external power source.

[0046] Rubber covers 17 are fixed to the opposite sides of the pump covers 1 of the two pump bodies by screws. The inner end of the rubber cover 17 presses against the outer edge of the corresponding sealing rubber disc 12. The middle part of the main shaft 9 is supported between the two rubber covers 17 by a deep groove ball bearing 19 to improve the stability of the structure.

[0047] A water inlet groove 202 and a water outlet groove 203 are symmetrically provided on the upper end of the main body 2 of each pump body and sealed by an upper cover plate 23 fixed to the upper end of the main body 2. One end of the circumference of the working chamber 201 is connected to the water inlet hole 22 through the water inlet groove 202, and the other end is connected to the water outlet hole 24 through the water outlet groove 203, so as to realize centralized water inlet and drainage.

[0048] An inlet seat 18 is provided on the outside of the main body 2 of one of the pump bodies, corresponding to the inlet hole 22. The inlet seat 18 is connected to the inlet hole 22 and is used to connect an external inlet pipe. A drain outlet 204 is provided on the upper part of the main body 2 of the other pump body, which is perpendicularly connected to the drain hole 24. A one-way valve seat 25 and an outlet seat 27 are fixed in sequence at the outer end of the drain outlet 204. A one-way valve 26 is provided in the one-way valve seat 25 to facilitate centralized inlet and outlet.

[0049] During operation, the main shaft 9 is driven to rotate by an external power source. After the main shaft 9 rotates, it drives the two rotors 3 to swing in their respective working chambers 201 through the eccentric sleeve 5. Through the cooperation of the C-shaped sleeve and the working chamber 201, water can be alternately drawn into the working chamber 201 through the water inlet 22, located between the inner and outer cavities of the C-shaped sleeve, and then collected at the drain outlet through the drain hole 24 and discharged through the one-way valve. For each rotation of the main shaft 9, two water intakes and two water discharges can be completed through the inner and outer cavities of the C-shaped sleeve of each rotor 3. Through the rotation of the two rotors 3, four water intakes and four water discharges can be completed. Since the eccentric directions of the two rotors 3 are opposite, the phase angle of the rotors 3 in the two pump bodies during the swinging motion is 180 degrees different. Therefore, the rotors 3 in the two pump bodies will alternately complete the suction and drainage operations, eliminating pulsation and ensuring good stability.

[0050] In addition, when the rotor 3 oscillates within the working chamber 201, the sealing rubber disc 12 can deform along with the rotor 3 and always wrap around the outside of the rotor 3. Therefore, when the rotor 3 oscillates, it can effectively seal each working chamber 201, achieving oil-water separation. Under high pressure conditions, it can avoid leakage problems, which not only improves pump efficiency but also extends the service life of the bearings on the main shaft 9.

[0051] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A double-suction, double-row positive displacement rotary pump, comprising a pump body, wherein a main shaft and a rotor are mounted within the pump body, characterized in that: The pump body consists of two symmetrically arranged pump bodies connected to each other. Each pump body is composed of a main body on the outer side and a pump cover on the inner side of the main body. A water inlet and a drain hole are symmetrically provided on the upper part of each pump body. A C-shaped working chamber is provided in the main body of each pump body. The two ends of the working chamber are connected to the water inlet and the drain hole, respectively. The rotors are eccentrically mounted on the main shaft through eccentric sleeves and bearings, and the eccentricity of the two rotors is opposite. The C-shaped sleeves on each rotor are inserted into the corresponding working chamber, so that the rotor can perform a reciprocating oscillating motion in the working chamber under the drive of the main shaft. A rotor cover is connected to the outer end of each rotor. Compensating inner sleeves are vulcanized on the inner outer wall and outer inner wall of the C-shaped working chamber of each main body to improve the pressurization effect. When the rotor moves, the inner and outer edges of its C-shaped sleeve are simultaneously interference-fitted with the compensating inner sleeve in the working chamber and have an inner tangent point and an outer tangent point, so that when the rotor swings in the working chamber, it can alternately achieve suction and drainage through the inner and outer cavities of the C-shaped sleeve. A limiting sleeve is fixed inside the pump cover. The inner edge of the limiting sleeve is provided with plum blossom-shaped internal teeth. A limiting disk is fixed on the outer edge of the rotor. The limiting disk is provided with plum blossom-shaped external teeth and eccentrically meshes with the internal teeth to realize the reciprocating swing limit of the rotor. Each pump body has a sealing rubber disc between its two ends and the rotor and rotor cover. The sealing rubber disc has multiple corrugated rubber sealing ribs to seal each working chamber.

2. The double-suction, double-displacement positive displacement rotor pump according to claim 1, characterized in that: The rotor is an integral structure consisting of a disc, a central sleeve located at the center of the disc, and a C-shaped sleeve located on one side of the disc.

3. A double-suction, double-displacement positive displacement rotor pump according to claim 2, characterized in that: C-shaped wear-resistant pads are fixed at the bottom of the working chamber of the main body, and the outer end of the C-shaped sleeve rests on the wear-resistant pads to prevent the C-shaped sleeve from wearing during rotor operation.

4. A double-suction, double-displacement positive displacement rotor pump according to claim 2 or 3, characterized in that: A double-ring wear-resistant ring is fixed on the main body of each pump body at the inlet of the working chamber. The C-shaped sleeve of the rotor passes through the C-shaped groove on the double-ring wear-resistant ring. The rotor disc and the limiting disc rest against the outer end face of the double-ring wear-resistant ring to prevent wear between the rotor and the pump body during operation.

5. A double-suction, double-displacement positive displacement rotor pump according to claim 1, characterized in that: Deep groove ball bearings are provided at both ends of the eccentric sleeve on the main shaft to prevent axial movement of the eccentric sleeve during operation.

6. A double-suction, double-displacement positive displacement rotor pump according to claim 1, characterized in that: Each pump body has a bearing end cover fixed on its outer side. The inner end of the bearing end cover presses against the outer edge of the corresponding sealing rubber disc. The main shaft is installed between the two bearing end covers via bearings.

7. A double-suction, double-displacement positive displacement rotor pump according to claim 6, characterized in that: in Rubber covers are fixed to opposite sides of the pump covers of the two pump bodies. The inner end of the rubber cover presses against the outer edge of the corresponding sealing rubber disc. The middle part of the main shaft is supported between the two rubber covers by a bearing to improve the stability of the structure.

8. A double-suction, double-displacement positive displacement rotor pump according to claim 1 or 7, characterized in that: The inner edge of the sealing rubber disc is respectively secured to the rotor or rotor cover by two retaining rings to prevent the sealing rubber disc from axially moving during operation.

9. A double-suction, double-row positive displacement rotor pump according to claim 1, characterized in that: Each pump body has a water inlet groove and a water outlet groove symmetrically opened on the upper end of the main body and sealed by the upper cover plate. One end of the circumference of the working chamber is connected to the water inlet hole through the water inlet groove, and the other end is connected to the water outlet hole through the water outlet groove, so as to realize centralized water inlet and drainage.

10. A double-suction, double-displacement positive displacement rotor pump according to claim 9, characterized in that: in One of the pump bodies has an inlet seat on the outer side of the main body corresponding to the inlet hole. The inlet seat is connected to the inlet hole and is used to connect an external inlet pipe. The other pump body has a drain outlet on the upper part of the main body that is perpendicular to the drain hole. A one-way valve seat and an outlet seat are fixed in sequence at the outer end of the drain outlet. A one-way valve is installed in the one-way valve seat to facilitate centralized inlet and outlet.

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