A magnetic drive high-pressure multi-stage liquefied gas pump

Abstract

The present invention discloses a magnetic drive high-pressure multi-stage liquefied gas pump. The present invention includes a speed reducer and a pump body. The pump body includes a pump body housing and a first pump cover and a second pump cover respectively fixed to both ends of the pump body housing. The pump body housing, the first pump cover, and the second pump cover form a pump cavity structure, and a stator module and a rotor module are arranged in the pump cavity structure. An eccentric bushing is arranged between the stator module and the rotor module. The speed reducer and the pump body are connected by a magnetic drive coupling. The input end of the pump shaft is connected to the output end of the speed reducer, and an isolation overflow cavity is formed between the rotor, the sliding vane and the eccentric bushing in the pump body. The present invention is modularly arranged, and the structure is convenient for disassembly, replacement and maintenance, improving work efficiency and saving maintenance costs. This structure has high- and low-pressure cavities, and the resultant radial force points to the low-pressure cavity. The single-stage pump bodies are symmetrically arranged, and the radial forces of each pump body cancel each other out, without causing damage to the pump due to high- and low-pressure alternating fatigue, and the service life of the pump is extended.

Description

Technical Field

[0001] The present invention belongs to the field of liquefied gas pumps, and relates to a magnetic drive horizontal high-pressure multi-stage petroleum liquefied gas sliding vane pump, in particular to a magnetic drive high-pressure multi-stage liquefied gas pump. Background Art

[0002] The magnetic drive horizontal high-pressure multi-stage petroleum liquefied gas sliding vane pump is a new type of special sliding vane pump designed and manufactured by applying magnetic drive technology based on absorbing the advanced technologies of similar foreign products and aiming at the characteristics of petroleum liquefied gas. It is mainly used for transporting liquefied petroleum gas, ethylene, ethane, propylene, propane, butane, etc., as well as hydrocarbons with strong volatility such as isopentane and heavy hydrocarbons. It can also transport other volatile liquids such as gasoline, diesel, liquid ammonia, and supercritical carbon dioxide. It is most suitable for the canning, pouring, truck unloading and vehicle fuel filling of liquefied petroleum gas.

[0003] At present, for the transportation of hydrocarbon products with high import pressure and a pressure difference higher than 2 Mpa, multi-stage centrifugal pumps are generally used. When the multi-stage centrifugal pump transports gas-containing liquids, the pump speed is high, the pump is prone to cavitation, and the pump is easily damaged, which cannot meet the medium transportation. Especially when the inlet pressure is large, its shaft end seal uses mechanical seal, which cannot withstand a large inlet pressure, and it is difficult to achieve sealing, affecting the use. Therefore, a magnetic drive high-pressure multi-stage liquefied gas pump is proposed to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a magnetic drive high-pressure multi-stage liquefied gas pump to solve the disadvantages that the current multi-stage centrifugal pump is prone to cavitation and damage when transporting gas-containing liquids, and cannot meet the medium transportation; especially to solve the problem that when the inlet pressure of the pump is large, its shaft end seal uses mechanical seal, which cannot withstand a large inlet pressure, and it is difficult to achieve sealing.

[0005] To achieve the above purpose, a magnetic drive high-pressure multi-stage liquefied gas pump described in the present invention includes a speed reducer and a pump body. The pump body includes a pump body housing and a first pump cover and a second pump cover respectively fixed to both ends of the pump body housing. The pump body housing, the first pump cover, and the second pump cover form a pump cavity structure, and a stator module and a rotor module are arranged in the pump cavity structure;

[0006] An eccentric bushing is arranged between the stator module and the rotor module;

[0007] The pump body housing is connected to the speed reducer through a bracket, and a magnetic drive coupling is arranged in the bracket; a pump inlet and a pump outlet are opened on the pump body housing;

[0008] The stator module is composed of a first-stage pump body, an intermediate pump body, and a final-stage pump body connected in sequence. The first-stage pump body is connected to the pump inlet, and the final-stage pump body is connected to the pump outlet. The pump cavity structure and the eccentric bushing enter the single-stage pump body inlet through an isolation flow-through cavity;

[0009] A first side plate is provided between the first pump cover and the first-stage pump body; a second side plate is provided between the second pump cover and the final-stage pump body;

[0010] The rotor module is composed of a pump shaft, bearings, and a rotor. The pump shaft is partially arranged in the pump body. The pump shaft penetrates through the first pump cover, and the pump shaft is rotatably connected to the first pump cover. One end of the pump shaft in the pump body is rotatably connected to the second pump cover;

[0011] The input end of the pump shaft is connected to the output end of the speed reducer. A rotor is installed on the pump shaft in the pump body; sliding vanes are provided on the rotor;

[0012] An isolation flow-through cavity is formed between the rotor, the sliding vanes, and the eccentric bushing.

[0013] The first-stage pump body, the intermediate pump body, and the final-stage pump body are fixedly installed in the pump body through pump body tie rods.

[0014] One end of the pump shaft is rotatably connected to the second pump cover through a pump shaft bearing. The input end of the pump shaft is connected to the output end of the speed reducer through a magnetic drive coupling. The magnetic drive coupling includes an outer rotor, an isolation sleeve, and an inner rotor; the outer rotor matches the inner rotor, and an isolation sleeve is arranged outside the inner rotor to isolate it from the outer rotor; the input end of the outer rotor is fixedly connected to the output end of the speed reducer, and the inner rotor is fixedly connected to the input end of the pump shaft.

[0015] A gasket groove is provided at the connection between the first pump cover and the bracket. A gasket is arranged in the gasket groove, and the gasket is tightly connected to the first pump cover and the bracket.

[0016] A placement groove is provided at the connection between the pump body housing and the second pump cover. An O-ring is placed in the placement groove. The O-ring fits tightly with the second pump cover and the placement groove, and the second pump cover and the pump body housing are fixedly connected through fastening bolts.

[0017] The pump inlet of the pump body housing is connected to an inlet flange, and the pump outlet of the pump body housing is connected to an outlet flange.

[0018] The pump shaft bearing is a silicon carbide ceramic component.

[0019] The sliding vanes connected to the rotor are several; several said sliding vanes are evenly distributed in a ring on the surface of the rotor.

[0020] The first-stage pump body, the intermediate pump body, and the final-stage pump body are all provided with isolation flow-through cavities, and the final-stage pump body, the intermediate pump body, and the first-stage pump body are connected through the isolation flow-through cavities.

[0021] The stator module is composed of a plurality of single-stage pump bodies, adjacent single-stage pump bodies among the plurality of single-stage pump bodies are interconnected, and the single-stage pump bodies are fixedly installed in the pump body through pump body tie rods.

[0022] Through the above-mentioned embodiments of the present application, an O-ring is used to solve the problem of unsatisfactory sealing effect at the top of the pump body shell, and improve the sealing performance of the connection between the first pump cover and the pump body shell.

[0023] The magnetically driven high-pressure multi-stage liquefied gas pump of the present invention has the following beneficial effects:

[0024] 1. The magnetically driven horizontal high-pressure multi-stage liquefied petroleum gas vane pump of the present invention has a modular connection arrangement, is easy to disassemble, and has a simple structure. The pump body shell and the first pump cover and the second pump cover are easy to disassemble, replace, and maintain, thereby improving work efficiency, saving maintenance costs, and meeting the use needs of workers.

[0025] 2. When in use, the inlet pressure is high, and the axial load is balanced by the first side plate and the second side plate at both ends of the pump body. The single-stage pump body forms high and low pressure cavities, and the resultant radial force points to the low pressure cavity. The single-stage pump body is symmetrically arranged, and the radial forces of each pump body offset each other. The damage to the pump caused by high and low pressure alternating fatigue will not affect the normal operation of the pump due to pressure changes.

[0026] 3. When in use, the reducer drives the outer magnetic rotor, the outer magnetic rotor forms a magnetic coupling to drive the inner magnetic rotor, and the inner magnetic rotor drives the pump shaft to rotate. In the absence of a rigid connection between the pump shaft and the reducer, the pump shaft power is transmitted to the rotor, and the isolation sleeve completely isolates the outer magnetic rotor from the medium to achieve a sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall three-dimensional structure of an embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of the overall cross-sectional structure of an embodiment of the present invention;

[0029] Figure 3 The overall embodiment of the present invention Figure 2 A schematic diagram of the partially enlarged structure at center A;

[0030] Figure 4 This is a schematic diagram of the connection structure between the first-stage pump body and the rotor in an embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of the overall top surface structure of an embodiment of the present invention;

[0032] Figure 6 Schematic diagram of the O-ring structure of an embodiment of the present invention.

[0033] In the figure: 1. Final-stage pump body; 2. Pump shaft bearing; 3. Eccentric bushing; 4. Second side plate; 5. Pump shaft; 6. Slipping piece; 7. Rotor; 8. Isolation overflow chamber; 8-1. Inlet of the isolation overflow chamber into the single-stage pump body; 9. Pump inlet; 10. First side plate; 11. Placing groove; 12. First pump cover; 13. Sealing gasket; 14. Outer magnetic rotor; 15. Isolation sleeve; 16. Inner magnetic rotor; 17. Reducer; 18. Second pump cover; 19. Bracket; 20. Pump outlet; 21. O-ring; 22. Pump body housing; 23. Intermediate pump body; 24. First-stage pump body; 25. Tie rod. Detailed implementation mode

[0034] Embodiment 1

[0035] As for a magnetic drive high-pressure multi-stage liquefied gas pump according to the present invention, as Figures 1-6 shown, a magnetic drive high-pressure multi-stage liquefied gas pump according to the present invention includes a reducer 17 and a pump body. The pump body includes a pump body housing 22 and a first pump cover 12 and a second pump cover 18 respectively fixed at both ends of the pump body housing 22. The pump body housing 22, the first pump cover 12 and the second pump cover 18 form a pump cavity structure, and a stator module and a rotor module are arranged in the pump cavity structure;

[0036] An eccentric bushing 3 is arranged between the stator module and the rotor module;

[0037] The pump body housing 22 is connected to the reducer 17 through a bracket 19, and a magnetic drive coupling is arranged in the bracket 19. A pump inlet 9 and a pump outlet 20 are arranged on the pump body housing 22;

[0038] The stator module is composed of a first-stage pump body 24, an intermediate pump body 23 and a final-stage pump body 1 connected in sequence. The first-stage pump body 24 is communicated with the pump inlet 9, the final-stage pump body 1 is communicated with the pump outlet 20, and the pump cavity structure and the eccentric bushing 3 are connected through an inlet 8-1 of the isolation overflow chamber into the single-stage pump body;

[0039] A first side plate 10 is arranged between the first pump cover 12 and the first-stage pump body 24; a second side plate 4 is arranged between the second pump cover 18 and the final-stage pump body 1;

[0040] The rotor module is composed of a pump shaft 5, bearings and a rotor 7. A part of the pump shaft 5 is arranged in the pump body. The pump shaft 5 penetrates through the first pump cover 12, and the pump shaft 5 is rotatably connected with the first pump cover 12. One end of the pump shaft 5 in the pump body is rotatably connected with the second pump cover 18;

[0041] The input end of the pump shaft 5 is connected to the output end of the reducer 17, and a rotor 7 is installed on the pump shaft 5 in the pump body; sliding pieces 6 are arranged on the rotor 7;

[0042] An isolation overflow chamber 8 is formed among the rotor 7, the sliding pieces 6 and the eccentric bushing 3.

[0043] The first-stage pump body 24, the intermediate pump body 23, and the last-stage pump body 1 are fixedly installed in the pump body through pump body tie rods 25.

[0044] One end of the pump shaft 5 is rotatably connected to the second pump cover 18 through a pump shaft bearing 2. The input end of the pump shaft 5 is connected to the output end of a speed reducer 17 through a magnetic drive coupling. The magnetic drive coupling includes an outer rotor 14, an isolation sleeve 15, and an inner rotor 16. The outer rotor 14 matches the inner rotor 16. An isolation sleeve 15 is arranged outside the inner rotor 16 to isolate it from the outer rotor 14. The input end of the outer rotor 14 is fixedly connected to the output end of the speed reducer 17, and the inner rotor 16 is fixedly connected to the input end of the pump shaft 5.

[0045] A gasket groove is provided at the connection between the first pump cover 12 and the bracket 19. A gasket 13 is arranged in the gasket groove, and the gasket 13 is tightly connected to the first pump cover 12 and the bracket 19.

[0046] A placement groove 11 is provided at the connection between the pump body housing 22 and the second pump cover 18. An O-ring 21 is placed in the placement groove 11. The O-ring 21 is in close fit with the second pump cover 18 and the placement groove 11. The second pump cover 18 and the pump body housing 22 are fixedly connected through fastening bolts.

[0047] The pump inlet 9 of the pump body housing 22 is connected to an inlet flange, and the pump outlet 20 of the pump body housing 22 is connected to an outlet flange.

[0048] The pump shaft bearing 2 is a silicon carbide ceramic component.

[0049] A number of sliding vanes 6 are connected to the rotor 7. The number of sliding vanes 6 is evenly distributed in a circular shape on the surface of the rotor 7.

[0050] The first-stage pump body 24, the intermediate pump body 23, and the last-stage pump body 1 are all communicated with an isolation overflow chamber 8. The last-stage pump body 1, the intermediate pump body 23, and the first-stage pump body 24 are communicated through the isolation overflow chamber 8.

[0051] The stator module is composed of a number of single-stage pump bodies. Adjacent single-stage pump bodies among the number of single-stage pump bodies are communicated with each other. The single-stage pump bodies are fixedly installed in the pump body through pump body tie rods 25.

[0052] When the present invention is in use, the electrical components appearing in the present invention are externally connected to a power source and a control switch during use. When the high-pressure medium enters the first-stage pump body 24 from the pump inlet 9, high- and low-pressure isolation chambers are respectively formed inside and outside the eccentric bushing 3 in the first-stage pump body 24. A high-pressure isolation chamber is formed by the eccentric bushing 3, the rotor 7, and the sliding vane 6 inside the eccentric bushing 3; a low-pressure isolation chamber is formed between the first-stage pump body 24 and the outside of the eccentric bushing 3; a first side plate 10 is provided between the first pump cover 12 and the first-stage pump body 24. The high-pressure medium impacts the first side plate 10, and the first side plate 10 is prone to wear due to the impact force. The first side plate 10 can be disassembled to protect the pump body and extend the service life of the pump body.

[0053] The medium then flows from the inlet of the first-stage pump body 24 to the outlet of the first-stage pump body 24; the medium sequentially passes through the last-stage pump body 1, the intermediate pump body 23, and the first-stage pump body 24. Isolation flow-through chambers 8 are provided between the last-stage pump body 1, the intermediate pump body 23, and the first-stage pump body 24 for mutual circulation, facilitating the flow of the medium to the lower-stage pump body. The medium is pressurized stage by stage by each pump body and finally discharged through the pump outlet 20 of the last-stage pump body 1. A second side plate 4 is provided between the second pump cover 18 and the last-stage pump body 1.

[0054] The speed reducer 17 drives the outer magnetic rotor 14 to rotate. The outer magnetic rotor 14 and the inner magnetic rotor 16 form a coupling magnetic force to drive the inner magnetic rotor 16, and the inner magnetic rotor 16 drives the pump shaft 5 to rotate; when there is no rigid connection between the pump shaft 5 and the speed reducer 17, the power of the speed reducer 17 is transmitted to the pump shaft 5. The pump shaft 5 is connected to the rotor 7, and the pump shaft 5 drives the rotor 7 to rotate. The rotor 7 is provided with a sliding vane 6, and the sliding vane 6 is driven by the centrifugal force of the rotor 7 to expand and contract in the eccentric bushing 3 to drive the medium to be pressurized stage by stage.

[0055] The isolation sleeve 15 isolates the outer magnetic rotor 14 from the inner magnetic rotor 16 to achieve a sealing effect; the O-ring 21 is closely attached to the second pump cover 18 and the pump body housing 22 to solve the problem of unsatisfactory sealing effect at the top of the pump body housing 22 and improve the sealing performance between the second pump cover 18 and the pump body housing 22.

Claims

1. A magnetic drive high-pressure multi-stage liquefied gas pump, including a speed reducer (17) and a pump body, characterized in that: The pump body includes a pump body housing (22) and a first pump cover (12) and a second pump cover (18) respectively fixed to both ends of the pump body housing (22); the pump body housing (22), the first pump cover (12), and the second pump cover (18) form a pump chamber structure, and a stator module and a rotor module are arranged in the pump chamber structure; An eccentric bushing (3) is arranged between the stator module and the rotor module; The pump body housing (22) is connected to the speed reducer (17) through a bracket (19), and a magnetic drive coupling is arranged in the bracket (19); a pump inlet (9) and a pump outlet (20) are provided on the pump body housing (22); The stator module is composed of a primary pump body (24), an intermediate pump body (23), and a final pump body (1) connected in sequence. The primary pump body (24) is communicated with the pump inlet (9), and the final pump body (1) is communicated with the pump outlet (20). The pump chamber structure and the eccentric bushing (3) enter the single-stage pump body inlet (8-1) through an isolation overflow chamber; A first side plate (10) is arranged between the first pump cover (12) and the primary pump body (24); a second side plate (4) is arranged between the second pump cover (18) and the final pump body (1); The rotor module is composed of a pump shaft (5), bearings, and a rotor (7). Part of the pump shaft (5) is arranged in the pump body, the pump shaft (5) penetrates through the first pump cover (12), and the pump shaft (5) is rotatably connected to the first pump cover (12). One end of the pump shaft (5) in the pump body is rotatably connected to the second pump cover (18); The input end of the pump shaft (5) is connected to the output end of the speed reducer (17), and a rotor (7) is installed on the pump shaft (5) in the pump body; sliding vanes (6) are arranged on the rotor (7); An isolation overflow chamber (8) is formed between the rotor (7), the sliding vanes (6), and the eccentric bushing (3); One end of the pump shaft (5) is rotatably connected to the second pump cover (18) through a pump shaft bearing (2), and the input end of the pump shaft (5) is connected to the output end of the speed reducer (17) through a magnetic drive coupling. The magnetic drive coupling includes an outer rotor (14), an isolation sleeve (15), and an inner rotor (16); the outer rotor (14) matches the inner rotor (16), and an isolation sleeve (15) is arranged outside the inner rotor (16) to isolate it from the outer rotor (14); the input end of the outer rotor (14) is fixedly connected to the output end of the speed reducer (17), and the inner rotor (16) is fixedly connected to the input end of the pump shaft (5); A gasket groove is provided at the connection between the first pump cover (12) and the bracket (19), and a gasket (13) is arranged in the gasket groove. The gasket (13) is tightly connected to the first pump cover (12) and the bracket (19); A placement groove (11) is provided at the connection between the pump body housing (22) and the second pump cover (18), and an O-ring (21) is placed in the placement groove (11). The O-ring (21) is tightly fitted to the second pump cover (18) and the placement groove (11), and the second pump cover (18) is fixedly connected to the pump body housing (22) through fastening bolts; The stator module is composed of a number of single-stage pump bodies. The adjacent single-stage pump bodies among the number of single-stage pump bodies are interconnected, and the single-stage pump bodies are fixedly installed in the pump body through pump body tie rods (25).

2. The magnetic drive high-pressure multi-stage liquefied gas pump according to claim 1, characterized in that: The first-stage pump body (24), the intermediate pump body (23), and the last-stage pump body (1) are fixedly installed in the pump body through pump body tie rods (25).

3. The magnetic drive high-pressure multi-stage liquefied gas pump according to claim 2, characterized in that: The pump inlet (9) of the pump body housing (22) is connected to an inlet flange, and the pump outlet (20) of the pump body housing (22) is connected to an outlet flange.

4. The magnetic drive high-pressure multi-stage liquefied gas pump according to claim 3, characterized in that: The pump shaft bearing (2) is a silicon carbide ceramic component.

5. The magnetic drive high-pressure multi-stage liquefied gas pump according to claim 4, characterized in that: A number of sliding vanes (6) are connected to the rotor (7); the number of sliding vanes (6) are evenly distributed in a ring on the surface of the rotor (7).

6. The magnetic drive high-pressure multi-stage liquefied gas pump according to claim 5, characterized in that: The first-stage pump body (24), the intermediate pump body (23), and the last-stage pump body (1) are all communicated with the isolation overflow chamber (8), and the last-stage pump body (1), the intermediate pump body (23), and the first-stage pump body (24) are communicated through the isolation overflow chamber (8).

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