Explosion-proof wear-resistant oil gas recovery pump

Abstract

The utility model relates to an explosion-proof wear-resistant oil gas recovery pump, which belongs to the technical field of pumps and comprises a motor and a pump, the pump comprises a pump body, a front cover, a rear cover, a rotor and a pump shaft, the front cover is provided with an inlet channel, an outlet channel, a suction inlet and an exhalation outlet which are communicated with an inner cavity of the pump body, and two axial ends of the rotor are pressed between the front cover and the rear cover in a dynamic sealing manner; a front wear-resisting piece and a rear wear-resisting piece with a self-lubricating function are arranged between the two axial end faces of the rotor and the front cover and between the two axial end faces of the rotor and the rear cover respectively, abrasion between the two axial end faces of the rotor and the end covers on the two axial sides of the pump cavity during high-speed rotation is reduced, and the sealing performance between the pump cavity and the rotor is improved. The sealing device has the advantages of reliable sealing performance, high operation efficiency, convenience in maintenance and replacement, low maintenance cost, long service life and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of pumps, and in particular relates to an explosion-proof oil and gas recovery pump. Background Art

[0002] Oil and gas recovery pumps are used to recover oil and gas during the refueling process at gas stations to prevent oil and gas from escaping into the air and causing environmental pollution and energy loss. Vane pumps are a relatively common structure. Their structure consists of two parts: a motor and a pump. The pump consists of a pump body and a rotor in the inner cavity. The rotor is a vane-type structure and is driven to rotate by the motor shaft, sucking oil and gas from the pump body inlet to the outlet to achieve the purpose of oil and gas recovery. However, the main problem with existing vane-type oil and gas recovery pumps is that the axial end faces of the rotor and the two side walls of the pump body are dynamically sealed. During the high-speed rotation of the rotor, the axial end faces of the rotor and the inner cavity walls of the pump body will produce significant wear, resulting in a gap between the two ends of the rotor and the inner cavity walls of the pump body due to wear. As the use time increases, the sealing performance of the product gradually decreases, and even leakage occurs, affecting the operating efficiency and service life of the product. Moreover, when the axial ends of the rotor are worn, the rotor or the end covers on both sides of the pump body need to be replaced, which has high maintenance costs. Utility Model Content

[0003] In response to the problems existing in the prior art, the utility model provides an explosion-proof and wear-resistant oil and gas recovery pump with a self-lubricating fitting structure between the axial ends of the rotor and the inner wall of the pump chamber, which can greatly reduce the wear between the two and has reliable sealing performance, high operating efficiency, long service life and low maintenance cost.

[0004] The technical solution for realizing the present utility model is as follows:

[0005] An explosion-proof, wear-resistant oil and gas recovery pump comprises a motor and a pump. The motor adopts an explosion-proof structure. The pump comprises a pump body, a front cover, a rear cover, a rotor and a pump shaft. The front cover is provided with an inlet channel and an outlet channel communicating with the inner cavity of the pump body, as well as a suction port and an exhalation port. The rear cover is connected to the motor through a base. One end of the pump shaft is connected to the motor shaft, and the other end is connected to the rotor. The rotor adopts a blade structure, and dynamic seals at both ends of the rotor axial direction are press-fitted between the front cover and the rear cover. The pump is characterized in that: a seal is provided between the two axial end surfaces of the rotor and the front cover and the rear cover respectively. A front wear-resistant plate and a rear wear-resistant plate are provided, the front wear-resistant plate is composed of a metal plate surface sprayed with a polytetrafluoroethylene layer, and is fixedly sealed and pressed between the front cover and the pump body, the rear wear-resistant plate is composed of a metal plate surface sprayed with a polytetrafluoroethylene layer, and is fixedly sealed and pressed between the rear cover and the pump body; the polytetrafluoroethylene layers on the front wear-resistant plate and the rear wear-resistant plate cooperate with the end faces on both sides of the rotor to form a self-lubricating dynamic sealing structure, the front wear-resistant plate has an air inlet connecting the inner cavity of the pump body with the suction port, and an air outlet connecting the inner cavity of the pump body with the exhalation port.

[0006] The preferred solution is that a pressure relief valve is arranged in the front cover between the inlet channel and the outlet channel, and the pressure relief valve consists of a valve body, a valve disc, a spring, a push rod and a floating pressure plate; the valve body inlet is connected with the inlet channel, and the valve body outlet is connected with the outlet channel, a conical sealing surface is provided at the outlet end of the valve body, and the valve disc is installed at the outlet end of the conical sealing surface, and its sealing surface and the conical sealing surface cooperate with each other to form a sealing pair, and the floating pressure plate is installed in the inner cavity on the inlet side of the valve body through a limit ring, and its outer circular surface is matched with the clearance of the inner cavity wall on the inlet side of the valve body; the back of the valve disc is fixedly connected to the push rod, and the spring is installed between the floating pressure plate on the outer circumference of the push rod and the radial inner step of the valve body.

[0007] The beneficial effects of the present invention compared with the prior art are:

[0008] 1. Self-lubricating front and rear wear-resistant plates are respectively provided between the two axial ends of the rotor and the front and rear covers to reduce the wear between the two axial ends of the rotor and the end covers on both sides of the pump chamber during high-speed rotation, thereby improving the sealing performance between the pump chamber and the rotor, and making the pump operate with high efficiency and long service life.

[0009] 2. After wear occurs between the axial ends of the rotor and the front wear-resistant plates and the rear wear-resistant plates due to long-term use, the sealing performance can be restored by replacing the front wear-resistant plates and the rear wear-resistant plates, avoiding the problem of high maintenance costs caused by the need to replace the rotor or the end covers on both sides of the pump chamber in the existing technology. It is easy to repair and replace and has low maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the present utility model.

[0011] Figure 2 This utility model Figure 1 Schematic diagram of the structure of the middle and front wear-resistant plate.

[0012] Figure 3 This utility model Figure 1 Schematic diagram of the structure of the middle and rear wear-resistant plates.

[0013] In the figure: 1 motor, 2 rear cover, 3 pump body, 4 rotor, 5 front cover, 6 inlet channel, 7 suction port, 8 rear wear plate, 9 front wear plate, 10 outlet channel, 11 exhalation port, 12 valve disc, 13 valve body, 14 push rod, 15 spring, 16 floating pressure plate, 17 limit ring, 18 pump shaft, 19 air inlet, 20 air outlet, 21 base. DETAILED DESCRIPTION

[0014] like Figure 1The flameproof and wear-resistant oil and gas recovery pump shown includes a motor 1 and a pump. The motor 1 adopts an explosion-proof structure. The pump includes a pump body 3, a front cover 5, a rear cover 2, a rotor 4 and a pump shaft 18. The front cover 5 is provided with an inlet channel 6 and an outlet channel 10 communicating with the inner cavity of the pump body 3, as well as a suction port 7 and an exhalation port 11. The rear cover 2 is connected to the motor 1 through a base 21. The pump body 3 is fixedly installed between the front cover 5 and the rear cover 2 by bolts and nuts. One end of the pump shaft 18 is connected to the rotating shaft of the motor 1, and the other end is connected to the rotor 4. The motor 1 drives the pump shaft 18 and the rotor 4 to rotate, and the gas is sucked in from the inlet channel 6. Then output from the outlet channel 10 to realize the oil and gas recovery function. The rotor 4 adopts a blade structure. The dynamic seals at both axial ends of the rotor 4 are press-fitted between the front cover 5 and the rear cover 2 to prevent the gas from leaking from the outlet cavity of the inner cavity of the pump body 3 to the inlet cavity and reducing the operating efficiency. That is to say, the sealing performance between the axial ends of the rotor 4 and the front cover 5 and the rear cover 2 directly affects the operating efficiency of the pump; its characteristic is that: a front wear-resistant sheet 9 and a rear wear-resistant sheet 8 are respectively arranged between the axial end surfaces of the rotor 4 and the front cover 5 and the rear cover 2, and the front wear-resistant sheet 9 and the rear wear-resistant sheet 8 are composed of a metal sheet surface sprayed with a polytetrafluoroethylene layer, such as Figure 2 、 Figure 3 As shown, the two are fixedly sealed and pressed between the pump body 3 and the front cover 5 and the rear cover 2; the polytetrafluoroethylene layers on the front wear-resistant plate 9 and the rear wear-resistant plate 8 cooperate with the end faces on both sides of the rotor 4 to form a self-lubricating dynamic sealing structure, which reduces the wear between the two end faces of the rotor 4 and the front cover 5 and the rear cover 2, improves the sealing performance between the rotor 4 and the inner cavity of the pump body 3, and maintains the product with good operating efficiency. Moreover, after the rotor 4 and the front wear-resistant plate 9 and the rear wear-resistant plate 8 are worn, the sealing performance can be restored by replacing the front wear-resistant plate 9 and the rear wear-resistant plate 8, which is convenient for maintenance and low in maintenance cost. The front wear-resistant plate 9 has an air inlet 19 connecting the inner cavity of the pump body 3 with the suction port 7 and an air outlet 20 connecting the inner cavity of the pump body 3 with the exhalation port 11.

[0015] A pressure relief valve is provided in the front cover 5 between the inlet channel 6 and the outlet channel 10. The pressure relief valve is composed of a valve body 13, a valve disc 12, a spring 15, a push rod 14 and a floating pressure plate 16. The inlet of the valve body 13 is connected to the inlet channel 6, and the outlet of the valve body 13 is connected to the outlet channel 10. A conical sealing surface is provided at the outlet end of the valve body 13. The valve disc 12 is installed at the outlet end of the conical sealing surface. The sealing surface and the conical sealing surface cooperate with each other to form a sealing pair. The floating pressure plate 16 is installed in the inner cavity on the inlet side of the valve body 13 through a limit ring 17. The outer cylindrical surface of the floating pressure plate 16 is connected to the inlet side of the valve body 13. The inner cavity wall gap fits; the back of the valve disc 12 is fixedly connected to the push rod 14, and the spring 15 is installed between the floating pressure plate 16 on the outer circumference of the push rod 14 and the radial inner step of the valve body 13. When the pump is running, the suction port 7 generates negative pressure on the back of the valve disc 12 through the gap between the outer circumference of the floating pressure plate 16 and the valve body 13, ensuring that the valve disc 12 and the conical sealing surface of the valve body 13 are sealed. When the inlet channel 6 exceeds the set pressure of the spring 15, the inlet pressure pushes the floating pressure plate 16 to move toward the outlet channel 10, pushing the push rod 14 to open the valve disc 12 to relieve pressure.

Claims

1. A flameproof and wear-resistant oil and gas recovery pump, comprising a motor (1) and a pump, wherein the motor (1) adopts an explosion-proof structure, the pump comprises a pump body (3), a front cover (5), a rear cover (2), a rotor (4) and a pump shaft (18), the front cover (5) is provided with an inlet channel (6) and an outlet channel (10) communicating with the inner cavity of the pump body (3), as well as a suction port (7) and an exhalation port (11), the rear cover (2) is connected to the motor (1) through a base (21), one end of the pump shaft (18) is connected to the rotating shaft of the motor (1), and the other end is connected to the rotor (4), the rotor (4) adopts a blade-type structure, and the axial ends of the rotor (4) are dynamically sealed and press-fitted between the front cover (5) and the rear cover (2); the pump is characterized in that: A front wear-resistant sheet (9) and a rear wear-resistant sheet (8) are respectively arranged between the axial end surfaces of the rotor (4) and the front cover (5) and the rear cover (2). The front wear-resistant sheet (9) and the rear wear-resistant sheet (8) are composed of a metal sheet with a polytetrafluoroethylene layer sprayed on the surface, and are respectively fixedly sealed and pressed between the pump body (3) and the front cover (5) and the rear cover (2); the polytetrafluoroethylene layers on the front wear-resistant sheet (9) and the rear wear-resistant sheet (8) cooperate with the end surfaces on both sides of the rotor (4) to form a self-lubricating dynamic sealing structure, and the front wear-resistant sheet (9) has an air inlet (19) and an air outlet (20), the air inlet (19) is connected to the inner cavity of the pump body (3) and the suction port (7), and the air outlet (20) is connected to the inner cavity of the pump body (3) and the exhalation port (11).

2. The flameproof and wear-resistant oil and gas recovery pump according to claim 1 is characterized in that: A pressure relief valve is provided in the front cover (5) between the inlet channel (6) and the outlet channel (10), and the pressure relief valve comprises a valve body (13), a valve disc (12), a spring (15), a push rod (14) and a floating pressure plate (16); the inlet of the valve body (13) is communicated with the inlet channel (6), and the outlet is communicated with the outlet channel (10); a conical sealing surface is provided at the outlet end of the valve body (13); the valve disc (12) is mounted at the outlet end of the conical sealing surface, and its sealing surface cooperates with the conical sealing surface to form a sealing pair; the floating pressure plate (16) is mounted in the inner cavity on the inlet side of the valve body (13) through a limit ring (17), and its outer circumferential surface is clearance-matched with the inner cavity wall on the inlet side of the valve body (13); the back of the valve disc (12) is fixedly connected to the push rod (14), and the spring (15) is mounted between the floating pressure plate (16) on the outer circumference of the push rod (14) and the radial inner step of the valve body (13).

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