ORVR oil gas recovery vacuum pump

Abstract

The utility model provides an ORVR oil and gas recovery vacuum pump, relates to the technical field of oil and gas recovery equipment of gas stations, and solves the technical problem that a vacuum pump used by a current secondary oil and gas recovery system is not suitable for being used in an ORVR vehicle-mounted oil and gas recovery system in the prior art. The device comprises a motor, a pump body, a gas pushing structure and an ORVR valve body, the pump body is located between the motor and the gas pushing structure, an output shaft of the motor penetrates through the pump body and is connected with the gas pushing structure, or the gas pushing structure is located between the motor and the pump body, and the output shaft of the motor is connected with the gas pushing structure; an air suction channel, an exhaust channel, a valve body channel, an air inlet through hole and an air outlet through hole are formed in the pump body, the air suction channel and the exhaust channel communicate with each other through the valve body channel, the ORVR valve body is installed in the valve body channel and controls the on-off of the valve body channel, the air suction channel communicates with the air pushing structure through the air inlet through hole, and the valve body channel communicates with the air outlet through hole through the air outlet through hole. And the exhaust channel is communicated with the gas pushing structure through the gas outlet through hole.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil station oil gas recovery equipment technical field especially is a kind of ORVR oil gas recovery vacuum pump. BACKGROUND

[0002] Secondary oil gas recovery system refers to the technology that during oil filling, the oil gas volatilized during oil filling is collected into underground storage tank for treatment by vacuum-assisted oil gas recovery equipment.The system uses the negative pressure generated by vacuum pump to suck the oil gas generated during oil filling into underground storage tank through underground oil gas recovery pipeline, thereby reducing the release of oil gas during oil filling and avoiding the leakage of oil gas into atmosphere.In order to maintain the ratio of gas-liquid ratio at 1.0~1.2, the vacuum pump has two working modes, one of which works at a constant speed, and the suction gas amount is automatically balanced by mechanical valve, and the other of which is adjusted by the speed of motor.

[0003] Due to oil gas recovery system, a part of gas is sucked back into oil storage tank each time, which increases the pressure, and the pressure needs to be released by PV valve, and these gases pollute the environment.Therefore, a new vehicle-mounted oil gas recovery technology, i.e.ORVR, ORVR vehicle-mounted oil gas recovery system, is generated, which does not use vacuum pump to recover gas in principle.When refueling the car with ORVR, the gas-liquid ratio of oil gun needs to be maintained below 0.5, and this function is realized by ORVR oil gun.

[0004] The vacuum pump used in current secondary oil gas recovery system is not suitable for use in ORVR vehicle-mounted oil gas recovery system, and when the gas-liquid ratio is below 0.5, the vacuum pump will be stuck and the motor will be burned when it rotates at the original speed. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing ORVR oil gas recovery vacuum pump to solve the technical problem that the vacuum pump used in current secondary oil gas recovery system is not suitable for use in ORVR vehicle-mounted oil gas recovery system in prior art. 。 The technical effects produced by the preferred technical scheme in the plurality of technical schemes provided by the utility model are described in detail below.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model provides a kind of ORVR oil gas recovery vacuum pump, including motor, pump body, gas push structure and ORVR valve body, wherein, the pump body is located between the motor and the gas push structure and the shell of the motor, the pump body and the gas push structure three are sequentially connected, the output shaft of the motor passes through the pump body and is connected with the gas push structure;Or the gas push structure is located between the motor and the pump body and the shell of the motor, the gas push structure and the pump body three are sequentially connected, the output shaft of the motor is connected with the gas push structure;

[0008] The pump body is provided with air suction channel, exhaust channel, valve body channel, air inlet through hole and air outlet through hole, the air suction channel and the exhaust channel are communicated by the valve body channel, the ORVR valve body is installed in the valve body channel and the ORVR valve body controls the on-off of the valve body channel, the air suction channel is communicated with the gas push structure through the air inlet through hole, and the exhaust channel is communicated with the gas push structure through the air outlet through hole.

[0009] Optionally, a gas suction connector is arranged on the port of the air suction channel, a gas exhaust connector is arranged on the port of the exhaust channel, and a flame arrester is mounted on the gas suction connector and the gas exhaust connector.

[0010] Optionally, two maintenance channels are further arranged on the pump body, one of the maintenance channels is communicated with the air suction channel, and the other of the maintenance channels is communicated with the exhaust channel, and a maintenance bolt is mounted in the maintenance channel.

[0011] Optionally, an explosion-proof assembly, a bearing assembly and a sealing element are mounted in the pump body, and the output shaft of the motor penetrates through the explosion-proof assembly, the bearing assembly and the sealing element.

[0012] Optionally, the gas push structure comprises a cylinder sleeve, an end cover, a rotor and a blade, the cylinder sleeve is located between the end cover and the pump body, the end cover is connected with the pump body through a screw rod, the rotor and the blade are located in the cylinder sleeve, the rotor is connected with the output shaft of the motor, and the rotor is eccentrically arranged.

[0013] A plurality of sliding grooves are arranged on the circumferential side wall of the rotor, the number of the blades is multiple, the blade is in one-to-one correspondence with the sliding groove and is in sliding connection, and adjacent two blades, the rotor and the cylinder sleeve form a closed cavity.

[0014] Optionally, a long arc-shaped groove and a short arc-shaped groove are further arranged on the end face of the pump body, the long arc-shaped groove is communicated with the air inlet through hole, the short arc-shaped groove is communicated with the air outlet through hole, and the long arc-shaped groove and the short arc-shaped groove are respectively communicated with different positions of the closed cavity.

[0015] Optionally, the ORVR valve body comprises a valve sleeve and a valve core, the valve core is located in the valve sleeve and is in sliding connection with the valve sleeve, the valve core can control the opening and closing of the valve sleeve, the valve sleeve is located in the valve body channel and is in threaded connection with the valve body channel.

[0016] Optionally, the valve core comprises a blocking piece, a sealing ring, a spring and a sliding piece, the blocking piece is in plug-in connection with the sliding piece, the sealing ring is sleeved on the blocking piece, the spring is sleeved on the sliding piece and the two ends of the spring are in abutment with the end of the sliding piece and the limiting step in the valve sleeve respectively, the sliding piece is in sliding connection with the inner ring of the valve sleeve, and the blocking piece can block the port of the valve sleeve.

[0017] Optionally, the axial side wall of the sliding piece is provided with a flow-through groove.

[0018] Optionally, a controller is further included, the controller is in electrical connection with the motor, and a current sensing element is arranged on the controller.

[0019] The ORVR oil gas recovery vacuum pump can maintain the secondary oil gas recovery at 1.0-1.2 according to the proportion of the gas-liquid ratio, and the oil gas sequentially passes through the oil gun, the air suction channel, the air inlet hole, the internal cavity of the gas pushing structure, the air outlet hole and the exhaust channel, and finally enters the oil tank; when the ORVR car is refueled, the ORVR oil gun function is opened, and the gas-liquid ratio is maintained below 0.5, at this time, the air suction channel cannot absorb the gas from the oil gun, and the internal negative pressure of the air suction channel is increased, so that the ORVR valve body is opened, the gas in the exhaust channel sequentially passes through the valve body channel, the air suction channel, the air inlet hole, the internal cavity of the gas pushing structure, the air outlet hole, and then returns to the exhaust channel, realizes internal circulation, avoids the ORVR oil gas recovery vacuum pump from being stuck and the motor from being burned, and makes the ORVR oil gas recovery vacuum pump applicable to the ORVR vehicle-mounted oil gas recovery system, and solves the technical problem that the vacuum pump used in the existing secondary oil gas recovery system is not suitable for use in the ORVR vehicle-mounted oil gas recovery system. 。 BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0021] Figure 1 is a structural schematic diagram of an embodiment one of the ORVR oil and gas recovery vacuum pump provided by the embodiments of the present application;

[0022] Figure 2 is a structural schematic diagram of another angle of the ORVR oil and gas recovery vacuum pump provided by the embodiments of the present application;

[0023] Figure 3 is a structural schematic diagram of the ORVR oil and gas recovery vacuum pump lacking an end cover provided by the embodiments of the present application;

[0024] Figure 4 is a structural schematic diagram of the ORVR oil and gas recovery vacuum pump lacking an end cover and a cylinder sleeve provided by the embodiments of the present application;

[0025] Figure 5 is a structural schematic diagram of the pump body of the ORVR oil and gas recovery vacuum pump provided by the embodiments of the present application;

[0026] Figure 6 is a structural schematic diagram of another angle of the pump body of the ORVR oil and gas recovery vacuum pump provided by the embodiments of the present application;

[0027] Figure 7 is a sectional view of the pump body of the ORVR oil and gas recovery vacuum pump provided by the embodiments of the present application;

[0028] Figure 8 is an internal structural schematic diagram of the pump body of the ORVR oil and gas recovery vacuum pump provided by the embodiments of the present application;

[0029] Figure 9 is a structural schematic diagram of the shell of the pump body of the ORVR oil and gas recovery vacuum pump provided by the embodiments of the present application;

[0030] Figure 10 is a sectional view of the shell of the pump body of the ORVR oil and gas recovery vacuum pump provided by the embodiments of the present application;

[0031] Figure 11 is a structural schematic diagram of the ORVR valve body of the ORVR oil and gas recovery vacuum pump provided by the embodiments of the present application;

[0032] Figure 12is another angle structure schematic view of the ORVR valve body of the ORVR oil gas recovery vacuum pump provided by the embodiment of the utility model;

[0033] Figure 13 is the cross-sectional view of the ORVR valve body of the ORVR oil gas recovery vacuum pump provided by the embodiment of the utility model;

[0034] Figure 14 is the structure schematic view of the valve core of the ORVR oil gas recovery vacuum pump provided by the embodiment of the utility model;

[0035] Figure 15 is the structure schematic view of the plugging piece of the ORVR oil gas recovery vacuum pump provided by the embodiment of the utility model;

[0036] Figure 16 is the structure schematic view of the sliding piece of the ORVR oil gas recovery vacuum pump provided by the embodiment of the utility model;

[0037] Figure 17 is the structure schematic view of the second embodiment of the ORVR oil gas recovery vacuum pump provided by the embodiment of the utility model;

[0038] Figure 18 is the cross-sectional view of the second embodiment of the ORVR oil gas recovery vacuum pump provided by the embodiment of the utility model.

[0039] 1, motor in drawing;

[0040] 2, pump body;21, air suction passage;211, air suction joint;212, fire damper;22, exhaust passage;221, exhaust joint;23, valve body passage;24, air inlet through hole;25, air outlet through hole;26, maintenance passage;27, maintenance bolt;28, long arc slot;29, short arc slot;

[0041] 3, gas pushing structure;31, cylinder sleeve;32, end cover;33, rotor;34, blade;

[0042] 4, ORVR valve body;41, valve sleeve;42, valve core;421, plugging piece;4211, plugging plate;4212, plugging sleeve;4213, abutment ring;4214, connecting rod;422, sealing ring;423, spring;424, sliding piece;4241, connecting sleeve;4242, fixed plate;4243, connecting piece;4244, positioning plate;

[0043] 5, explosion-proof assembly;

[0044] 6, controller. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0046] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] Embodiment one

[0049] The utility model provides a kind of ORVR oil gas recovery vacuum pump, including motor 1, pump body 2, gas push structure 3 and ORVR valve body 4, wherein, pump body 2 is located between motor 1 and gas push structure 3 and the shell of motor 1, pump body 2 and gas push structure 3 three are sequentially connected, the output shaft of motor 1 passes through pump body 2 and is connected with gas push structure 3, gas suction passage 21, exhaust passage 22, valve body passage 23, air inlet through hole 24 and air outlet through hole 25 are provided in pump body 2, gas suction passage 21 and exhaust passage 22 are connected by valve body passage 23, gas suction passage 21, valve body passage 23 and exhaust passage 22 form a U-shaped structure, ORVR valve body 4 is installed in valve body passage 23 and ORVR valve body 4 controls the on-off of valve body passage 23, gas suction passage 21 is connected with gas push structure 3 by air inlet through hole 24, exhaust passage 22 is connected with gas push structure 3 by air outlet through hole 25.The utility model provides a kind of ORVR oil gas recovery vacuum pump, when giving non-ORVR car, motor 1 can drive gas push structure 3 to operate, ORVR valve body 4 is in closed state, ORVR oil gas recovery vacuum pump can be maintained at 1.0~1.2 according to the proportion of gas-liquid ratio to carry out secondary oil gas recovery, oil gas passes through oil gun, gas suction passage 21, air inlet through hole 24, the internal cavity of gas push structure 3, air outlet through hole 25, exhaust passage 22 in proper order, and finally into oil tank;When giving ORVR car, ORVR oil gun function will open, gas-liquid ratio is maintained below 0.5, when gas suction passage 21 cannot absorb the gas from oil gun, the internal negative pressure of gas suction passage 21 will increase, so that ORVR valve body 4 will be opened, the gas in exhaust passage 22 passes through valve body passage 23, gas suction passage 21, air inlet through hole 24, the internal cavity of gas push structure 3, air outlet through hole 25 in proper order, and then returns to exhaust passage 22, realizes internal circulation, avoids ORVR oil gas recovery vacuum pump jam, motor 1 burns out, so that ORVR oil gas recovery vacuum pump can be applicable to ORVR vehicle-mounted oil gas recovery system, solve the technical problem that the vacuum pump used in current secondary oil gas recovery system in prior art is not suitable for use in ORVR vehicle-mounted oil gas recovery system.

[0050] As optional implementation, the port of gas suction passage 21 is provided with gas suction connector 211, the gas suction connector 211 can be quickly disassembled with oil gun pipeline, the port of exhaust passage 22 is provided with exhaust connector 221, the exhaust connector 221 can be quickly disassembled with oil tank pipeline, the gas suction connector 211 and exhaust connector 221 are all installed with flame arrester 212, when ORVR oil gas recovery vacuum pump burns, the flame arrester 212 is used to extinguish flame.

[0051] As an optional implementation, two maintenance channels 26 are further arranged on the pump body 2, one of the maintenance channels 26 is communicated with the suction passage 21, and the other maintenance channel 26 is communicated with the exhaust passage 22, and a maintenance bolt 27 is arranged in the maintenance channel 26, so that whether the pump body 2 is damaged can be quickly checked.

[0052] As an optional implementation, the pump body 2 is internally provided with an explosion-proof assembly 5, a bearing assembly and a sealing element, and the output shaft of the motor 1 penetrates through the explosion-proof assembly 5, the bearing assembly and the sealing element. The explosion-proof assembly 5 plays a role of explosion-proof partition and is used to block the flame from entering the pump body 2.

[0053] As an optional implementation, the gas pushing structure 3 includes a cylinder sleeve 31, an end cover 32, a rotor 33 and blades 34, the cylinder sleeve 31 is located between the end cover 32 and the pump body 2, the end cover 32 is connected with the pump body 2 through a screw rod, the rotor 33 and the blades 34 are located in the cylinder sleeve 31, the rotor 33 is connected with the output shaft of the motor 1 and is eccentrically arranged; the rotor 33 can be made of copper material, a plurality of sliding grooves are arranged on the circumferential side wall of the rotor 33, the number of the blades 34 is multiple, the blades 34 are made of PPS material and have the characteristics of self-lubrication, high strength and wear resistance, the blades 34 are in one-to-one correspondence with the sliding grooves and are in sliding connection, and the adjacent two blades 34, the rotor 33 and the cylinder sleeve 31 form a closed cavity. The motor 1 can drive the rotor 33 to rotate, under the action of centrifugal force, the blades 34 will move to the radial direction, so that the other end of the blade 34 is tightly attached to the inner wall of the cylinder sleeve 31, thereby changing the volume of the closed cavity in the rotating process, and the volume will change from small to large and then from large to small, thereby realizing the suction and exhaust process.

[0054] As an optional implementation, the end surface of the pump body 2 is further provided with a long arc-shaped groove 28 and a short arc-shaped groove 29, the long arc-shaped groove 28 is communicated with the gas inlet through hole 24, and the short arc-shaped groove 29 is communicated with the gas outlet through hole 25, the long arc-shaped groove 28 and the short arc-shaped groove 29 are respectively communicated with the closed cavities at different positions, the closed cavities are communicated with the suction passage 21 through the gas inlet through hole 24, and the closed cavities are communicated with the exhaust passage 22 through the gas outlet through hole 25.

[0055] As an optional implementation, the ORVR valve body 4 includes a valve sleeve 41 and a valve core 42, the valve core 42 is located in the valve sleeve 41 and is in sliding connection with the valve sleeve 41, the valve core 42 can control the opening and closing of the valve sleeve 41, the valve sleeve 41 is located in the valve body passage 23 and is in threaded connection with the valve body passage 23, the valve core 42 will move to the direction close to the suction passage 21 under the action of the negative pressure inside the suction passage 21, so that a flow gap is generated between the valve core 42 and the valve sleeve 41, and the gas can flow; the valve core 42 will also move to the opposite direction under the action of the compression force of itself, so as to block the valve sleeve 41.

[0056] As an optional implementation, the valve core 42 comprises a blocking piece 421, a sealing ring 422, a spring 423 and a sliding piece 424, the blocking piece 421 is connected with the sliding piece 424 in a plug-in manner, the sealing ring 422 is sleeved on the blocking piece 421, the spring 423 is sleeved on the sliding piece 424 and two ends of the spring 423 are respectively abutted against an end of the sliding piece 424 and a limiting step in the valve sleeve 41, the sliding piece 424 is connected with an inner ring of the valve sleeve 41 in a sliding manner, the blocking piece 421 can block the port of the valve sleeve 41, and an axial side wall of the sliding piece 424 is provided with a flow-through groove. Under the action of the negative pressure in the suction passage 21, the blocking piece 421 will move towards the suction passage 21, thereby being separated from the port of the valve sleeve 41, and the sliding piece 424 will also move, thereby compressing the spring 423, so that the gas can pass through the flow-through groove. Under the action of the compression force of the spring 423, the sliding piece 424 will move in the opposite direction, thereby also moving the blocking piece 421 in the opposite direction, so that the blocking piece 421 enters the port of the valve sleeve 41, and the blocking piece 421 will be sealed by the sealing ring 422, thereby blocking the valve sleeve 41.

[0057] The blocking piece 421 comprises a blocking plate 4211, a blocking sleeve 4212, an abutment ring 4213 and a connecting rod 4214, the blocking plate 4211 is fixedly connected with one end of the blocking sleeve 4212, the inner ring of the abutment ring 4213 is fixedly connected with the outer ring of the other end of the blocking sleeve 4212, the end of the connecting rod 4214 is located in the blocking sleeve 4212 and is fixedly connected with the blocking plate 4211, an installation groove is formed among the blocking plate 4211, the outer wall of the blocking sleeve 4212 and the abutment ring 4213, the sealing ring 422 is installed in the installation groove, the connecting rod 4214 is connected with the sliding piece 424 in a plug-in manner, and the connecting rod 4214 is inserted into the plug-in passage.

[0058] The sliding piece 424 comprises a connecting sleeve 4241, a fixed plate 4242, a connecting piece 4243 and a positioning plate 4244, the connecting sleeve 4241, the fixed plate 4242 and the connecting piece 4243 are sequentially fixedly connected and the plug-in passage is arranged in the three, the number of the positioning plates 4244 is plural, all the positioning plates 4244 are distributed along the circumferential direction of the connecting piece 4243, a part of the positioning plates 4244 is fixedly connected with the connecting piece 4243, and the other part of all the positioning plates 4244 exceeds the connecting piece 4243 and is connected, the spring 423 is sleeved on the positioning plate 4244, and the flow-through groove is arranged between adjacent two positioning plates 4244.

[0059] As an optional implementation, the controller 6 is electrically connected with the motor 1, the current sensing element is arranged on the controller 6, the controller 6 can control the running speed of the motor 1, so that the gas-liquid ratio can be 1.0-1.2 when refueling the non-ORVR car. The motor 1 can be a direct-current permanent magnet motor, and the motor 1 is provided with two kinds of hole position mounting modes, so that the damaged vacuum pump can be quickly replaced, and the maintenance time is reduced. When refueling the ORVR car, the current sensing element on the controller 6 can sense that the current flowing is larger than that when refueling the non-ORVR car, so that the controller 6 can control the motor 1 to stop, and the protection effect is achieved. The gas-liquid ratio can be maintained lower.

[0060] Embodiment two

[0061] The difference between the embodiment two and the embodiment one is that:

[0062] The utility model provides a kind of ORVR oil gas recovery vacuum pump, including motor 1, pump body 2, gas push structure 3 and ORVR valve body 4, wherein, gas push structure 3 is located between motor 1 and pump body 2 and the shell of motor 1, gas push structure 3 and pump body 2 three are sequentially connected, and the output shaft of motor 1 is connected with gas push structure 3;Pump body 2 is provided with air suction passage 21, exhaust passage 22, valve body passage 23, air inlet through hole 24 and air outlet through hole 25, air suction passage 21 and exhaust passage 22 are communicated by valve body passage 23, air suction passage 21, valve body passage 23 and exhaust passage 22 are on same straight passage, ORVR valve body 4 is installed in valve body passage 23 and ORVR valve body 4 controls the on-off of valve body passage 23, air suction passage 21 is communicated with gas push structure 3 by air inlet through hole 24, and exhaust passage 22 is communicated with gas push structure 3 by air outlet through hole 25.Pump body 2 is equivalent to the end cover on gas push structure 3.Gas push structure 3 and motor 1 are provided with fixing seat, and explosion-proof assembly 5, bearing assembly and sealing element are installed in fixing seat.

[0063] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be limited to the protection scope of the claims.

Claims

1. An ORVR vapor recovery vacuum pump characterized by, Including motor (1), pump body (2), gas pushing structure (3) and ORVR valve body (4), wherein, The pump body (2) is located between the motor (1) and the gas pushing structure (3), and the housings of the motor (1), the pump body (2) and the gas pushing structure (3) are connected in sequence, the output shaft of the motor (1) passes through the pump body (2) and is connected with the gas pushing structure (3);Or the gas pushing structure (3) is located between the motor (1) and the pump body (2), and the housings of the motor (1), the gas pushing structure (3) and the pump body (2) are connected in sequence, the output shaft of the motor (1) is connected with the gas pushing structure (3); The pump body (2) is provided with an air suction channel (21), an air exhaust channel (22), a valve body channel (23), an air inlet through hole (24) and an air outlet through hole (25), the air suction channel (21) and the air exhaust channel (22) are communicated through the valve body channel (23), the ORVR valve body (4) is installed in the valve body channel (23), and the ORVR valve body (4) controls the opening and closing of the valve body channel (23), the air suction channel (21) is communicated with the gas pushing structure (3) through the air inlet through hole (24), and the air exhaust channel (22) is communicated with the gas pushing structure (3) through the air outlet through hole (25).

2. The ORVR vapor recovery vacuum pump of claim 1, wherein, The port of the air suction channel (21) is provided with an air suction connector (211), the port of the air exhaust channel (22) is provided with an air exhaust connector (221), and the air suction connector (211) and the air exhaust connector (221) are both installed with a flame arrestor (212).

3. The ORVR vapor recovery vacuum pump of claim 1, wherein, Two maintenance channels (26) are further provided on the pump body (2), one of the maintenance channels (26) is communicated with the air suction channel (21), and the other of the maintenance channels (26) is communicated with the air exhaust channel (22), and a maintenance bolt (27) is installed in the maintenance channel (26).

4. The ORVR vapor recovery vacuum pump of claim 1, wherein, An explosion-proof assembly (5), a bearing assembly and a sealing element are installed in the pump body (2), and the output shaft of the motor (1) passes through the explosion-proof assembly (5), the bearing assembly and the sealing element.

5. The ORVR vapor recovery vacuum pump of claim 1, wherein, The gas pushing structure (3) comprises a cylinder sleeve (31), an end cover (32), a rotor (33) and a blade (34), the cylinder sleeve (31) is located between the end cover (32) and the pump body (2), the end cover (32) is connected with the pump body (2) through a screw rod, the rotor (33) and the blade (34) are located in the cylinder sleeve (31), the rotor (33) is connected with the output shaft of the motor (1), and the rotor (33) is eccentrically arranged; A plurality of sliding grooves are arranged on the circumferential side wall of the rotor (33), the number of the blades (34) is multiple, the blades (34) correspond to the sliding grooves one by one and are connected in sliding mode, and adjacent two blades (34), the rotor (33) and the cylinder sleeve (31) form a closed cavity.

6. The ORVR vapor recovery vacuum pump of claim 5, wherein, The end face of the pump body (2) is further provided with a long arc-shaped groove (28) and a short arc-shaped groove (29), the long arc-shaped groove (28) is communicated with the air inlet through hole (24), the short arc-shaped groove (29) is communicated with the air outlet through hole (25), and the long arc-shaped groove (28) and the short arc-shaped groove (29) are respectively communicated with different positions of the closed cavity.

7. The ORVR vapor recovery vacuum pump of claim 1, wherein, The ORVR valve body (4) comprises a valve sleeve (41) and a valve core (42), the valve core (42) is located in the valve sleeve (41), the valve core (42) and the valve sleeve (41) are in sliding connection, the valve core (42) can control the on-off of the valve sleeve (41), the valve sleeve (41) is located in the valve body channel (23), and the valve sleeve (41) and the valve body channel (23) are in threaded connection.

8. The ORVR vapor recovery vacuum pump of claim 7, wherein, The valve core (42) comprises a blocking piece (421), a sealing ring (422), a spring (423) and a sliding piece (424), the blocking piece (421) and the sliding piece (424) are in plug-in connection, the sealing ring (422) is sleeved on the blocking piece (421), the spring (423) is sleeved on the sliding piece (424), and the two ends of the spring (423) are respectively in abutment with the end of the sliding piece (424) and a limiting step in the valve sleeve (41), the sliding piece (424) and the inner ring of the valve sleeve (41) are in sliding connection, and the blocking piece (421) can block the port of the valve sleeve (41).

9. The ORVR vapor recovery vacuum pump of claim 8, wherein, An axial side wall of the sliding piece (424) is provided with a flow through groove.

10. The ORVR vapor recovery vacuum pump of claim 1, wherein, Further comprising a controller (6), the controller (6) is electrically connected with the motor (1), and a current sensing element is arranged on the controller (6).

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