Electric pump and oil gas recovery device

Abstract

The utility model discloses an electric pump and an oil gas recovery device, which comprise a power assembly and a negative pressure generation assembly, and the power assembly is used for providing power output and is provided with a driving shaft for outputting power; the negative pressure generating assembly is used for generating negative pressure and is provided with a connecting shaft used for transmitting input power, one end of the connecting shaft is connected with one end of the driving shaft, and the driving shaft drives the connecting shaft to rotate; according to the scheme, the transition connecting block made of plastic is ingeniously arranged in the connecting shaft matching structure between the driving shaft and the connecting shaft, so that when the connecting shaft is matched with the driving shaft, metal collision sparks can be avoided, and a guarantee is provided for working safety of the electric pump; and a bearing and a limiting clamp spring are arranged on a receding hole, penetrating out of the first shell, of the driving shaft, so that the driving shaft can be prevented from moving during rotating work, and the working stability and the power transmission reliability of the device are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pump machine, oiling equipment field especially, relates to electric pump and oil gas recovery device. BACKGROUND

[0002] As the energy saving and environmental protection work of the current popular oiling equipment, the oil gas recovery of the oiling machine sets up the oil gas recovery pipeline on the oil gun of the oiling machine, combines the negative pressure device to attract and recover the oil gas generated during oiling, to avoid the oil gas overflow during oiling, and to avoid the oil gas overflow, which can effectively improve the air cleanliness of the gas station, and can also eliminate the safety hazard of the large amount of oil gas escaping, and reduce the loss of available energy, although there are some oil gas recovery pumps for the oiling machine on the market at present, but the oil gas recovery pump of the current oiling machine mostly has a complex transmission structure, which often needs frequent maintenance or replacement of parts due to wear of parts after long-term work. Among them, the negative pressure generating assembly and the driving motor assembly are important parts of the oil gas recovery pump, the driving motor assembly is used for providing power, and the power is transmitted to the negative pressure generating assembly through the transmission part, and the negative pressure generating assembly generates the negative pressure required for oil gas recovery.

[0003] The traditional oil gas recovery pump mostly directly adopts the mode of connecting the driving shaft of the driving motor assembly and the negative pressure generating assembly, under this structure form, once the negative pressure generating assembly or the motor of the driving motor assembly fails, the two need to be disassembled respectively, which is not only time-consuming and laborious, but also needs to be debugged after disassembly and reassembly, and in order to overcome the problem, some researchers put forward the structure form that the coupling is used to connect the negative pressure generating assembly and the driving motor assembly, but it still has some problems such as complicated cooperation and inconvenient disassembly, therefore, how to optimize the structure of the power transition part of the oil gas recovery pump, so that it has good power transmission reliability and considers the advantage of convenient disassembly is a very positive and practical research subject. SUMMARY

[0004] Therefore, the utility model discloses the purpose in order to propose a kind of electric pump and oil gas recovery device, which is convenient to disassemble and reliable in implementation, and stable in structure.

[0005] In order to realize the above technical purpose, the technical scheme adopted by the utility model is as follows:

[0006] An electric pump comprises:

[0007] A power assembly is used to provide power output, and has a driving shaft for outputting power;

[0008] A negative pressure generating assembly for generating negative pressure, having a connecting shaft for transmitting input power, one end of the connecting shaft being connected with one end of a driving shaft, the driving shaft driving the connecting shaft to rotate;

[0009] One end of the driving shaft is provided with a connecting groove, and a transition connecting block made of plastic is detachably arranged in the connecting groove, the transition connecting block not protruding from the connecting groove, and the transition connecting block being provided with a insertion groove; one end of the connecting shaft is provided with an insertion block corresponding to the insertion groove, the structure of the insertion block being adapted to the insertion groove, and the insertion block being inserted into the insertion groove to connect one end of the connecting shaft with one end of the driving shaft.

[0010] As a possible implementation, further, the transition connecting block is made of nylon, and when the transition connecting block is arranged in the connecting groove, the outer wall of the transition connecting block is attached to the inner wall of the connecting groove, and when the insertion block is inserted into the insertion groove, the outer surface of the insertion block is attached to the inner wall of the insertion groove.

[0011] As a possible implementation, further, the power assembly comprises:

[0012] A first housing, an installation cavity being arranged in the first housing;

[0013] A brushless direct current motor being fixedly installed in the installation cavity, a rotating shaft of the brushless direct current motor being arranged as the driving shaft, the driving shaft extending out of one end of the first housing, and the first housing being provided with an avoiding hole corresponding to the driving shaft;

[0014] A bearing being arranged on the avoiding hole, an outer ring of the bearing being fixedly connected with the avoiding hole, and the driving shaft being fixedly arranged in an inner ring of the bearing and extending out of the first housing.

[0015] As a preferred implementation, further, the power assembly comprises:

[0016] A limiting snap spring being fixedly connected with a portion of the driving shaft extending through the avoiding hole, and the driving shaft being further provided with a clamping groove corresponding to the limiting snap spring.

[0017] As a preferred implementation, further, the power assembly comprises:

[0018] An explosion-proof gasket being in a ring structure, a fixed cover of the explosion-proof gasket being arranged on the avoiding hole, and the driving shaft being rotatably arranged in an inner ring of the explosion-proof gasket.

[0019] As a preferred implementation, further, the brushless direct current motor is connected with an external power supply through a cable, and the first housing is further provided with a connecting portion for arranging the cable, the cable being a multi-strand wire structure.

[0020] The connecting part is further connected with a connecting sleeve with a tubular structure, one end of the connecting sleeve is threadedly connected with the connecting part, and a sealing ring is arranged between the other end of the connecting sleeve and the connecting part; the cable is arranged to pass through the inside of the tubular structure of the connecting sleeve and extend to the inside of the first shell and be connected with the brushless DC motor.

[0021] As a preferred embodiment, the negative pressure generating assembly comprises:

[0022] The second shell is a cylindrical structure with both ends open;

[0023] The rotor mechanism is arranged in the second shell, and the rotor mechanism and both sides of the maximum spacing part of the inner wall of the second shell form a first region and a second region in communication with each other;

[0024] The base is fixedly connected to the lower part of the second shell, and the lower part of the base is further fixedly connected to the upper end surface of the second shell;

[0025] The connecting seat is fixedly connected to the upper part of the second shell, and a pair of air guide grooves are arranged on the end surface of the second shell and correspondingly connected to the first region and the second region;

[0026] The first gasket is arranged between the connecting seat and the upper end surface of the second shell and separates the pair of air guide grooves, and the first gasket is provided with a corresponding avoidance slot corresponding to the structure of the air guide groove;

[0027] The connecting joint is a pair of and corresponds to the air guide groove and is connected;

[0028] The connecting shaft is connected to the rotor mechanism at one end and rotatably penetrates the base at the other end and is connected to the driving shaft, so that when the driving shaft of the power assembly rotates, the connecting shaft rotates, the rotor mechanism of the negative pressure generating assembly inputs driving force, the gas in the first region is pushed to the second region and is output by the corresponding air guide groove and connecting joint of the second region, so that negative pressure is generated in the first region, or the gas in the second region is pushed to the first region and is output by the corresponding air guide groove and connecting joint of the first region, so that negative pressure is generated in the second region;

[0029] The base is provided with a penetrating slot for the connecting shaft to penetrate, an oil seal is arranged on the upper part of the penetrating slot, at least one bearing is arranged on the lower part of the penetrating slot, and a first clasp is arranged on the middle part of the connecting shaft in the penetrating slot.

[0030] As a preferred embodiment of the rotor mechanism, the rotor mechanism comprises:

[0031] The rotor is eccentrically arranged in the second shell and the lower end surface is attached to the upper end surface of the base or forms a gap with a distance less than a preset value, the rotor and the two sides of the maximum distance part of the inner wall of the second shell form a first area and a second area which are in communication with each other, and the circumferential side of the rotor is provided with a plurality of radially extending insertion slots.

[0032] The blades are multiple and correspond to the insertion slots on the rotor and are slidably arranged in the insertion slots.

[0033] The one end of the connecting shaft is connected to the rotor through a key or a stud, the center of the rotor is provided with a mounting hole connected to the connecting shaft, and the rotor is rotated by the connecting shaft to drive the rotor to rotate, the blades slidably arranged in the insertion slots on the rotor are rotated, the gas in the first area is pushed to the second area and output by the corresponding gas guide groove and the connecting joint of the second area, so that negative pressure is generated in the first area, or the gas in the second area is pushed to the first area and output by the corresponding gas guide groove and the connecting joint of the first area, so that negative pressure is generated in the second area.

[0034] As another preferred embodiment of the rotor mechanism, preferably, the rotor mechanism described in the scheme comprises:

[0035] The rotor is eccentrically arranged in the second shell and the lower end surface is attached to the upper end surface of the base or forms a gap with a distance less than a preset value, the rotor and the two sides of the maximum distance part of the inner wall of the second shell form a first area and a second area which are in communication with each other, and the circumferential side of the rotor is provided with a plurality of radially extending insertion slots.

[0036] The rollers are in a cylindrical structure, the number is multiple, and correspond to the arc-shaped movable slots on the rotor and are movably arranged in the arc-shaped movable slots.

[0037] The one end of the connecting shaft is connected to the rotor through a key or a stud, the center of the rotor is provided with a mounting hole connected to the connecting shaft, and the rotor is rotated by the connecting shaft to drive the rotor to rotate, the blades slidably arranged in the insertion slots on the rotor are rotated, the gas in the first area is pushed to the second area and output by the corresponding gas guide groove and the connecting joint of the second area, so that negative pressure is generated in the first area, or the gas in the second area is pushed to the first area and output by the corresponding gas guide groove and the connecting joint of the first area, so that negative pressure is generated in the second area.

[0038] Based on the above, the scheme also proposes an oil gas recovery device for a fuel dispenser, which comprises the electric pump, the electric pump is connected with the oil gas recovery pipeline of the fuel dispenser, and is used to provide the required negative pressure for oil gas recovery.

[0039] Compared with the prior art, the utility model has the beneficial effects that: the transition connecting block made of plastic material is arranged in the connecting shaft cooperation structure between the driving shaft and the connecting shaft, which can avoid metal collision sparks when the connecting shaft cooperates with the driving shaft, and provides protection for the safe operation of the electric pump; the bearing and the limit clasp arranged on the avoiding hole of the first shell through which the driving shaft penetrates can avoid the driving shaft from moving when rotating, and improve the working stability and power transmission reliability of the device. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the following description of the drawings is only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0041] Figure 1 It is a brief implementation structure three-dimensional perspective schematic view of the electric pump of the utility model;

[0042] Figure 2 It is a brief implementation structure three-dimensional cutaway perspective schematic view one of the electric pump of the utility model;

[0043] Figure 3 It is a brief implementation structure three-dimensional cutaway perspective schematic view two of the electric pump of the utility model;

[0044] Figure 4 It is a local cooperation structure explosion schematic view of the electric pump of the utility model;

[0045] Figure 5 It is a brief implementation structure two-dimensional cutaway perspective schematic view of one rotor mechanism of the electric pump of the utility model;

[0046] Figure 6 It is a brief implementation structure two-dimensional cutaway perspective schematic view of another rotor mechanism of the electric pump of the utility model. DETAILED DESCRIPTION

[0047] The utility model will be further described in detail in combination with the drawings and embodiments. It is particularly pointed out that the following embodiments are only used for illustrating the utility model, but do not limit the scope of the utility model. Similarly, the following embodiments are only some embodiments of the utility model but not all embodiments, and all other embodiments obtained by those skilled in the art without creative labor belong to the scope of the utility model protection.

[0048] As Figures 1 to 6 One of the embodiments of the utility model, an electric pump, comprising:

[0049] The power assembly 1 is used for providing power output, and has a driving shaft 11 for outputting power;

[0050] The negative pressure generating assembly 2 is used for generating negative pressure, and has a connecting shaft 20 for transmitting input power, one end of the connecting shaft 20 is connected with one end of the driving shaft 11, and the connecting shaft 20 is driven to rotate by the driving shaft 11;

[0051] One end of the driving shaft 11 is provided with a connecting groove 111, and a transition connecting block 3 made of plastic is detachably arranged in the connecting groove 111, the transition connecting block 3 does not protrude from the connecting groove 111, and the transition connecting block 3 is provided with a plug groove 31; one end of the connecting shaft 20 is provided with a plug block 211 corresponding to the plug groove 31 and matching the structure of the plug groove 31, and the plug block 211 is inserted into the plug groove 31 to connect one end of the connecting shaft 20 with one end of the driving shaft 11.

[0052] As a possible implementation, the transition connecting block 3 is made of nylon, and when the transition connecting block 3 is arranged in the connecting groove 111, the outer wall of the transition connecting block 3 is attached to the inner wall of the connecting groove 111, and when the plug block 211 is inserted into the plug groove 31, the outer surface of the plug block 211 is attached to the inner wall of the plug groove 31.

[0053] The transition connecting block 3 made of nylon can avoid metal collision sparks when the connecting shaft 20 is matched with the driving shaft 11, which provides safety guarantee for the operation of the electric pump, and the transition connecting block 3 can also be made of other plastic materials.

[0054] As a possible implementation of the power assembly 1, the power assembly 1 further comprises:

[0055] A first housing 12, which is provided with a mounting cavity 121;

[0056] A brushless direct current motor 13 is fixedly installed in the mounting cavity 121; a rotating shaft of the brushless direct current motor 13 is arranged as the driving shaft 11, which extends out of one end of the first housing 12, and the first housing 12 is provided with an avoiding hole 123 corresponding to the driving shaft;

[0057] A bearing 14 is arranged on the avoiding hole 123, an outer ring of the bearing 14 is fixedly connected with the avoiding hole 123, the driving shaft 11 is fixedly arranged with an inner ring of the bearing 14, and extends out of the first housing 12.

[0058] As a more preferred implementation, the power assembly further comprises:

[0059] The limit snap spring 15 is clamped and fixed on the part of the driving shaft 11 passing through the avoiding hole 123, and the driving shaft 11 is also provided with a clamping groove 112 matched with the limit snap spring 15.

[0060] The explosion-proof gasket 18 is annular in structure, and the fixed cover is arranged on the avoiding hole 123, and the driving shaft 11 can rotate through the inner ring of the annular structure of the explosion-proof gasket 18.

[0061] In the scheme, the brushless direct current motor 13 is an outer rotor type brushless direct current motor, and the driving shaft 11 and the stator of the brushless direct current motor 13 have an explosion-proof joint surface 113 with a spacing of about 0.5 mm, and the length is 0.01-30 mm, which can be 1, 3, 5, 7, 10, 15, 20 or 30 mm.

[0062] The arrangement of the limit snap spring 15 and the bearing 14 improves the rotation stability of the driving shaft 11 and avoids the movement of the driving shaft 11 during rotation.

[0063] As a relatively optimal implementation option, preferably, the brushless direct current motor 13 is connected to external power supply through the cable 17, and the first shell 12 is also provided with a connecting part 122 for passing the cable 17, and the cable 17 is a multi-strand wire structure.

[0064] The connecting sleeve 16 of tubular structure is also connected to the connecting part 13, which is used as an explosion-proof column, one end of the connecting sleeve 16 is threadedly connected to the connecting part 13, and a sealing ring 161 is also arranged between the other end of the connecting sleeve 16 and the connecting part 13; the cable 17 passes through the tubular structure of the connecting sleeve 16 and extends to the inside of the first shell 12 and is connected to the brushless direct current motor 13.

[0065] As a relatively optimal implementation option, preferably, the negative pressure generating assembly 2 comprises:

[0066] The second shell 21 is a cylindrical structure with both ends open;

[0067] The rotor mechanism 22 is arranged in the second shell 21, and the rotor mechanism 22 and the two sides of the maximum spacing part of the inner wall of the second shell 21 form a first area 223 and a second area 224 in communication with each other;

[0068] The base 23 is fixedly connected to the lower part of the second shell 21, and the lower part of the base 23 is also fixedly connected to the upper end surface of the second shell 21;

[0069] The connecting seat 24 is fixedly connected with the upper portion of the second shell 21, and a pair of air guide grooves 261 corresponding to the first region 223 and the second region 224 are arranged on the end face of the second shell 21 in a symmetrical manner. The air guide grooves 261 are further provided with a fire damper 262.

[0070] In the scheme, the O-shaped sealing ring 2213 is further arranged between the rotor mechanism 22, the connecting seat 24 and the base 23, so as to improve the air tightness of the negative pressure generating assembly 2.

[0071] The first gasket 25 is arranged between the connecting seat 24 and the upper end face of the second shell 21 and separates the pair of air guide grooves. The first gasket 25 is provided with a corresponding avoidance through groove 251 matched with the structure thereof.

[0072] The connecting joint 26 is a pair of connecting joints corresponding to the air guide grooves;

[0073] The connecting shaft 20 is connected with the rotor mechanism 22 at one end and rotatably penetrates the base 23 at the other end and is connected with the driving shaft 11, so that when the driving shaft 11 of the power assembly 1 rotates, the connecting shaft 29 is driven to rotate, the rotor mechanism 22 of the negative pressure generating assembly 2 inputs driving force, the gas in the first region 223 is pushed to the second region 224 and is output by the corresponding air guide grooves 261 and the connecting joints 26 of the second region 224, so that negative pressure is generated in the first region 223, or the gas in the second region 224 is pushed to the first region 223 and is output by the corresponding air guide grooves 261 and the connecting joints 26 of the first region 223, so that negative pressure is generated in the second region 224.

[0074] The base 23 is provided with a penetrating through groove 231 for the connecting shaft 20 to penetrate, the upper portion of the penetrating through groove 231 is provided with an oil seal 28, the lower portion of the penetrating through groove 231 is provided with at least one bearing 29, and the connecting shaft 20 is provided with a first snap spring 212 at the middle portion of the penetrating through groove 231.

[0075] On the basis shown in any one of Figures 1 to 4 The base shown in any one of Figure 5 As a preferred embodiment of the rotor mechanism 22, preferably, the rotor mechanism 22 comprises:

[0076] The rotor 221 is eccentrically arranged in the second shell 21 and the lower end face thereof is attached to the upper end face of the base 23 or forms a gap with a gap less than a preset value, the rotor 221 and the two sides of the maximum gap position of the inner wall of the second shell 21 form a first region 223 (i.e. AOC region) and a second region 224 (i.e. AOB region) in communication with each other, the circumferential side of the rotor 221 is provided with a plurality of radially extending insertion grooves 2211, and the middle portion of the upper end face of the rotor 221 is provided with a limiting step 2212.

[0077] The blades 222 are multiple and correspond to the slots 2211 on the rotor 221 and are slidably arranged in the slots 2211;

[0078] The one end of the connecting shaft 20 is connected with the rotor 221 through a key or a stud, the rotor 221 is provided with a mounting hole at the center and is connected with the connecting shaft 20, is rotated by the connecting shaft 20, drives the rotor 221 to rotate, rotates the blades 222 slidably arranged in the slots 2211 on the rotor, pushes the gas in the first area 223 to the second area 224 and is output by the corresponding gas guide groove 261 and the connecting joint 26 of the second area 224, so that the negative pressure is generated in the first area 223 or the gas in the second area 224 is pushed to the first area 223 and is output by the corresponding gas guide groove 261 and the connecting joint 26 of the first area 224, so that the negative pressure is generated in the second area 224.

[0079] In order to avoid the rotor 221 from being heated during the operation, the gap between the rotor 221 and the base 23 or the connecting seat 24 is reduced, and the friction force is increased, the base 23 is further provided with an expansion groove 233, the expansion groove 233 is provided with an elastic gasket 27, and the lower end of the rotor 221 is attached to the elastic gasket 27.

[0080] On the basis shown in one of Figures 1 to 4 On the basis shown in one of Figure 6 As another preferred embodiment of the rotor mechanism, preferably, the rotor mechanism 22 comprises:

[0081] The rotor 221 is eccentrically arranged in the second housing 21 and the lower end surface is attached to the upper end surface of the base 23 or forms a gap with a gap less than a predetermined value, the rotor 221 and the two sides of the maximum gap part of the inner wall of the second housing 21 form a first area 223 and a second area 224 in communication with each other, the circumferential side of the rotor 221 is provided with a plurality of radially extending arc-shaped movable grooves 2251, and the middle part of the upper end surface of the rotor 221 is provided with a limiting step;

[0082] The roller 226 is in a cylindrical structure, the number is multiple and corresponds to the arc-shaped movable groove 2251 on the rotor 221 and is movably arranged in the arc-shaped movable groove 2251;

[0083] The one end of the connecting shaft 20 is connected with the rotor 221 through a key or a stud, the rotor 221 is provided with a mounting hole in the center and is connected with the connecting shaft 20, is rotated by the connecting shaft 20, drives the rotor 221 to rotate, the roller 226 in the arc-shaped movable groove 2251 on the rotor is followed to rotate and is attached to the inner side wall of the second shell 21 under the action of centrifugal force, the gas in the first area 223 is pushed to the second area 224 and is output by the corresponding gas guide groove 261 and the connecting joint 26 of the second area 224, so that the negative pressure is generated in the first area 223, or the gas in the second area 224 is pushed to the first area 223 and is output by the corresponding gas guide groove 261 and the connecting joint 26 of the first area 223, so that the negative pressure is generated in the second area 223.

[0084] Based on the above, the present scheme also proposes an oil gas recovery device for a gasoline dispenser, which comprises the electric pump, the electric pump is connected with an oil gas recovery pipeline of the gasoline dispenser, and is used for providing negative pressure required for oil gas recovery.

[0085] The above only describes some embodiments of the present application, and does not limit the protection scope of the present application, any equivalent device or equivalent process conversion obtained by using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An electric pump comprising: a power assembly for providing a power output, having a drive shaft for outputting power; a negative pressure generating assembly for generating negative pressure, having a connecting shaft for transmitting input power, one end of the connecting shaft being connected with one end of the drive shaft, the connecting shaft being driven to rotate by the drive shaft; characterized in that one end of the drive shaft is provided with a connecting groove, a transition connecting block made of plastic is detachably arranged in the connecting groove, the transition connecting block does not protrude out of the connecting groove, and the transition connecting block is provided with a plug groove; one end of the connecting shaft is provided with a plug block corresponding to the plug groove and having a structure suitable for the plug groove, the plug block is inserted into the plug groove, and one end of the connecting shaft is connected with one end of the drive shaft.

2. The electric pump of claim 1, wherein The transition connecting block is made of nylon, when arranged in the connecting groove, the outer wall of the transition connecting block is attached to the inner wall of the connecting groove, and when the plug block is inserted into the plug groove, the outer surface of the plug block is attached to the inner wall of the plug groove.

3. The electric pump of claim 1, wherein The power assembly comprises: a first housing, having an installation cavity arranged therein; a brushless direct current motor, fixedly arranged in the installation cavity; a rotating shaft of the brushless direct current motor is arranged as the drive shaft, the drive shaft extends out of one end of the first housing, and the first housing is provided with an avoiding hole corresponding to the drive shaft; a bearing, arranged on the avoiding hole, having an outer ring fixedly connected with the avoiding hole, and the drive shaft is fixedly arranged with an inner ring of the bearing and extends out of the first housing.

4. The electric pump of claim 3, wherein The power assembly further comprises: a limit snap spring, clamped and fixed on a portion of the drive shaft extending through the avoiding hole, and the drive shaft is further provided with a clamping groove corresponding to the limit snap spring.

5. The electric pump of claim 3, wherein The power assembly further comprises: an explosion-proof gasket, having an annular structure, and a fixed cover arranged on the avoiding hole, and the drive shaft rotatably extends through an inner ring of the annular structure of the explosion-proof gasket.

6. The electric pump of claim 3, wherein The brushless direct current motor is connected to an external power supply through a cable, and a connecting portion for arranging the cable is further arranged on one side of the first housing, and the cable has a multi-strand wire structure; wherein a connecting sleeve with a tubular structure is further connected to the connecting portion, one end of the connecting sleeve is threadedly connected with the connecting portion, and a sealing ring is further arranged between the other end of the connecting sleeve and the connecting portion; the cable extends into the tubular structure of the connecting sleeve and is connected with the brushless direct current motor in the first housing.

7. The electric pump according to one of claims 1 to 6, characterized in that The negative pressure generating assembly comprises: a second housing, having a tubular structure with both ends open; a rotor mechanism, arranged in the second housing, and forming a first region and a second region in communication with each other on both sides of a maximum distance part between the rotor mechanism and the inner wall of the second housing; a base, fixedly connected with a lower part of the second housing, and further fixedly connected with an upper end surface of the second housing; a connecting seat, fixedly connected with an upper part of the second housing, and provided with a pair of air guide grooves corresponding to the first region and the second region and arranged opposite to each other on an end surface of the connecting seat; a first gasket, arranged between the connecting seat and the upper end surface of the second housing and separating the pair of air guide grooves, and provided with an avoiding through groove corresponding to the structure of the pair of air guide grooves; a connecting joint, a pair of and corresponding to the air guide grooves and connected with the air guide grooves. A connecting shaft, one end of which is connected with the rotor mechanism, and the other end of which is rotatably penetrated through the base and connected with the driving shaft, so that when the driving shaft of the power assembly rotates, it drives the connecting shaft to rotate, and the rotor mechanism of the negative pressure generating assembly inputs driving force, so that the gas in the first area is pushed to the second area and output by the corresponding gas guide groove and connecting joint of the second area, so that negative pressure is generated in the first area, or the gas in the second area is pushed to the first area and output by the corresponding gas guide groove and connecting joint of the first area, so that negative pressure is generated in the second area. The base is provided with a penetrating channel corresponding to the connecting shaft, the upper part of the penetrating channel is provided with an oil seal, the lower part of the penetrating channel is provided with at least one bearing, and the middle part of the connecting shaft in the penetrating channel is provided with a first clamping spring.

8. The electric pump of claim 7, wherein The rotor mechanism comprises: The rotor is eccentrically arranged in the second housing and the lower end surface is attached to the upper end surface of the base or forms a gap with a distance less than a preset value, the rotor and the two sides of the maximum distance part of the inner wall of the second housing form a first area and a second area in communication with each other, and the circumferential side of the rotor is provided with a plurality of radially extending insertion slots. The blades are a plurality of and correspond to the insertion slots on the rotor and are slidably penetrated in the insertion slots. One end of the connecting shaft is connected with the rotor through a key or a stud, the center of the rotor is provided with a mounting hole connected with the connecting shaft, the rotor is rotated by the rotation of the connecting shaft to drive the rotor to rotate, the blades slidably penetrated in the insertion slots on the rotor are rotated, the gas in the first area is pushed to the second area and output by the corresponding gas guide groove and connecting joint of the second area, so that negative pressure is generated in the first area, or the gas in the second area is pushed to the first area and output by the corresponding gas guide groove and connecting joint of the first area, so that negative pressure is generated in the second area.

9. The electric pump of claim 7, wherein The rotor mechanism comprises: The rotor is eccentrically arranged in the second housing and the lower end surface is attached to the upper end surface of the base or forms a gap with a distance less than a preset value, the rotor and the two sides of the maximum distance part of the inner wall of the second housing form a first area and a second area in communication with each other, and the circumferential side of the rotor is provided with a plurality of radially extending insertion slots. The rollers are in a cylindrical structure, a plurality of and correspond to the arc-shaped movable slots on the rotor and movably arranged in the arc-shaped movable slots. One end of the connecting shaft is connected with the rotor through a key or a stud, the center of the rotor is provided with a mounting hole connected with the connecting shaft, the rotor is rotated by the rotation of the connecting shaft to drive the rotor to rotate, the blades slidably penetrated in the insertion slots on the rotor are rotated, the gas in the first area is pushed to the second area and output by the corresponding gas guide groove and connecting joint of the second area, so that negative pressure is generated in the first area, or the gas in the second area is pushed to the first area and output by the corresponding gas guide groove and connecting joint of the first area, so that negative pressure is generated in the second area.

10. An oil vapor recovery device for a fuel dispenser, comprising: It comprises the electric pump of any one of claims 1 to 8, the electric pump is connected with the oil gas recovery pipeline of the oil filling machine, and is used for providing negative pressure required for oil gas recovery.

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