Oil and gas recovery vacuum pump and refueling machine

Abstract

The present invention discloses an oil and gas recovery vacuum pump and a refueling machine. The vacuum pump cooperates with a motor, a gear mechanism, a coupling, a connecting seat, a second connecting shell, a rotor and a push plate. The motor drives the gear mechanism to drive the coupling to pull the rotor to rotate eccentrically, so that a pair of push plates are disengaged by centrifugal force and stick to the inner wall of the second connecting shell, so that the air in the first trough is pushed into the second trough and output from the second joint, or the air in the second trough is pushed into the first trough and output from the first joint. The gear mechanism cooperates with the first gear set, the second rotating shaft, the transition gear, the second gear set and the shift fork, etc., and the shift fork drives the second gear set to slide up or down on the third rotating shaft, so that the gear at the upper end of the second gear set is meshed with the transition gear on the second rotating shaft or the gear at the lower end of the second gear set is meshed with the gear at the lower end of the first gear set, so as to achieve that motors with different directions are adapted to the rotor rotation direction of this scheme.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum pumps, in particular to the field of pump devices used in fuel dispensers, and specifically to an oil and gas recovery vacuum pump and a fuel dispenser. Background Art

[0002] The oil and gas recovery technology of fuel dispensers is a new energy-saving and environmentally friendly technology. It uses oil and gas recovery technology to recover the oil and gas emitted during the storage, transportation and loading and unloading of oil products, prevent air pollution caused by oil and gas volatilization, and eliminate safety hazards. Its main idea is to improve the utilization rate of energy, reduce economic losses, and thus obtain considerable benefits in return.

[0003] However, the oil and gas recovery vacuum pump structure in the prior art is unidirectional. When the oil and gas recovery vacuum pump and the motor are installed reversely, that is, the motor direction is opposite to the preset direction, oil and gas backflow will occur, which will damage the oil and gas vacuum pump itself and other related equipment. Most of the existing vacuum pump supporting components cannot be temporarily adjusted according to the motor direction, that is, customized parts. Therefore, this also makes it difficult to immediately adapt to the situation of the old motor when assembling the vacuum pump. Summary of the invention

[0004] In view of the prior art, the purpose of the present invention is to provide an oil and gas recovery vacuum pump with strong adaptability, reliable structural coordination and flexible use, and its application in a fuel dispenser.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0006] An oil and gas recovery vacuum pump is connected in a fuel dispenser and is used to provide the negative pressure required for the fuel dispenser to recover oil and gas, and comprises:

[0007] Motor;

[0008] The first connecting shell is a cylindrical structure, one end of which is fixed to the end surface of the motor provided with the rotating shaft;

[0009] A gear mechanism is fixed in the first connecting housing and one end of which is connected to the rotating shaft of the motor;

[0010] A coupling, one end of which is connected to the other end of the gear mechanism;

[0011] A connecting seat is fixedly arranged at the other end of the first connecting shell, and a first sinking groove and a second sinking groove are symmetrically arranged on an end surface of the connecting seat away from the first connecting shell;

[0012] The second connecting shell is a cylindrical structure, one end of which is fixedly abutted on the connecting seat and surrounds the first sinking groove and the second sinking groove;

[0013] A first joint, one end of which is fixed to one side of the connecting seat and communicated with the first sink;

[0014] A second joint, one end of which is fixed to the other side of the connecting seat and communicated with the second sink;

[0015] The rotor is a circular structure and is eccentrically rotatably mounted on the end surface of the connecting seat away from the first connecting shell through the connecting shaft, and the upper end surface of the rotor is flush with the upper end surface of the second connecting shell;

[0016] A connecting cover, which is arranged on the upper end surface of the second connecting shell and seals the rotor in the second connecting shell;

[0017] A pair of push plates, wherein the upper end surface of the rotor is provided with a pair of oppositely arranged slide grooves, and the slide grooves extend along the edge of the rotor and form an opening, the pair of slide grooves correspond to the pair of push plates one by one, and the push plates are slidably connected in the slide grooves, and the ends of the push plates away from the center of the rotor are arc-shaped structures;

[0018] The lower end of the connecting shaft passes through the connecting seat and is connected to the other end of the coupling, and the motor drives the gear mechanism to drive the coupling to pull the rotor to rotate eccentrically, so that a pair of push plates are disengaged due to centrifugal force and stick to the inner wall of the second connecting shell, so that the air in the first sink groove is pushed into the second sink groove and output from the second joint, or the air in the second sink groove is pushed into the first sink groove and output from the first joint.

[0019] As one possible implementation of the gear mechanism, further, the gear mechanism includes:

[0020] A connecting plate, fixed in the first connecting shell;

[0021] The first gear set includes a pair of gears which are opposite to each other and fixedly connected to each other, and are rotatably connected to the end surface of the connecting plate through a first rotating shaft, and the upper end of the first rotating shaft is connected to the coupling;

[0022] A second rotating shaft, rotatably connected to one side of the first gear set;

[0023] A transition gear, fixed to the upper end of the second rotating shaft and meshing with the gear at the upper end of the first gear set;

[0024] A third rotating shaft, one end of which is connected to the rotating shaft of the motor, and the other end of which passes through the upper end surface of the connecting plate;

[0025] The second gear set includes a pair of gears that are opposite to each other and fixedly connected to each other, and are slidably sleeved on the other end of the third rotating shaft through a key connection;

[0026] A shift fork, one end of which is a shift end and is constrainedly connected between the two gears of the second gear set, and drives the second gear set to slide up on the third rotating shaft so that the gear at the upper end of the second gear set meshes with the transition gear on the second rotating shaft, or drives the second gear set to slide up and down on the third rotating shaft so that the gear at the lower end of the second gear set meshes with the gear at the lower end of the first gear set;

[0027] A guide rod, the lower end of which passes through the middle of the shift fork and is fixed on the connecting plate;

[0028] The screw rod has a lower end that is rotatably connected to the connecting plate through a connecting block, and an upper end that extends vertically upward and is threadedly connected to the other end of the shift fork. The rotation of the screw rod drives the shift fork to rise and fall, and a slot is provided on one side of the connecting block;

[0029] The hook has one end rotatably connected to the connecting plate through a torsion spring, and the other end is used for restraining cooperation with the slot on the connecting block.

[0030] As a preferred optional implementation mode, preferably, the connecting plate is also fixedly sleeved with a third connecting shell, the first gear set, the second gear set and the transition gear are not higher than the upper end surface of the third connecting shell, and the upper end of the first rotating shaft passes through the third connecting shell and is connected to the coupling.

[0031] As a preferred embodiment, preferably, the third connection shell is fixedly connected to the first connection shell via a first connection portion, and the first connection shell is correspondingly provided with a second connection portion that cooperates with the third connection shell.

[0032] As a possible implementation method, further, the solution also includes:

[0033] A one-way valve connected to the first connector to form an air outlet;

[0034] The motor-driven gear mechanism drives the coupling to pull the rotor to rotate eccentrically, causing a pair of push plates to break away from the centrifugal force and stick to the inner wall of the second connecting shell, so that the air in the second sink is pushed into the first sink and output from the first joint. At the same time, negative pressure is formed in the second sink and air is sucked out through the second joint.

[0035] As a possible implementation manner, further, the first sink and the second sink are connected via a pressure relief valve.

[0036] As a possible implementation mode, further, the present solution also includes a plurality of first connecting bolts arranged in a circular array and a plurality of second connecting bolts arranged in a circular array, the first connecting bolts sequentially pass through the connecting seat and the first connecting shell to fix the connecting seat and the first connecting shell to the motor, and the second connecting bolts sequentially pass through the connecting cover and the second connecting shell to fix the connecting cover and the second connecting shell to the connecting seat.

[0037] In the above structural case, the present solution also provides another possible implementation of the gear mechanism, further, the coupling and the gear mechanism are interchanged, one end of the coupling is connected to the rotating shaft of the motor, the other end of the coupling is connected to one end of the gear mechanism, and the other end of the gear mechanism is connected to the connecting shaft;

[0038] The gear mechanism comprises:

[0039] A connecting sleeve, the upper end of which is fixedly connected to the connecting shaft through a connecting piece, and an annular gear structure is provided on the inner circumference of the connecting sleeve;

[0040] A pair of support plates, which are annular structures and are respectively fixed to the upper and lower ends of the connecting sleeve;

[0041] A plurality of traction gears are rotatably connected between a pair of support plates in an annular array and are all meshed with the annular gear structure in the connecting sleeve;

[0042] One end of the traction shaft is connected to the other end of the coupling, and the other end is inserted into the connecting sleeve and meshed with several traction gears through the main driving gear. The motor drives the coupling to pull the traction shaft to drive the main driving gear to drive several traction gears to rotate, so that the traction gear pulls the connecting sleeve to drive the connecting shaft to rotate.

[0043] As a preferred implementation, preferably, the number of the traction gears is 3.

[0044] As a preferred embodiment, preferably, the connecting shaft extends in a direction approaching the connecting cover and penetrates the connecting cover and can be used for connection with the gear mechanism.

[0045] A refueling machine comprises the oil and gas recovery vacuum pump described above.

[0046] By adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: the present scheme ingeniously utilizes the cooperation of components such as the motor, the gear mechanism, the coupling, the connecting seat, the second connecting shell, the rotor and the push plate, and the rotor is rotatably connected to the connecting seat through the connecting shaft, the lower end of the connecting shaft passes through the connecting seat and is connected to the other end of the coupling, and the motor drives the gear mechanism to drive the coupling to pull the rotor to rotate eccentrically, so that a pair of push plates are disengaged by centrifugal force and stick to the inner wall of the second connecting shell, so that the air in the first sink groove is pushed into the second sink groove and output from the second joint, or the air in the second sink groove is pushed into the first sink groove and output from the first joint, and the gear mechanism cooperates with the first gear group, the second rotating shaft, the transition gear, the third rotating shaft, the second gear group and the shift fork, and the shift fork drives the second gear group to slide up on the third rotating shaft, so that the gear at the upper end of the second gear group The wheel meshes with the transition gear on the second rotating shaft, or drives the second gear group to slide up and down the third rotating shaft, so that the gear at the lower end of the second gear group meshes with the gear at the lower end of the first gear group, so as to realize that the motor with different rotation directions is adapted to the rotor rotation direction of this scheme, and the first sink groove and the second sink groove of the connecting seat are symmetrically designed. Therefore, on the basis of this scheme, the gear mechanism of this scheme can also be a planetary structure. This scheme also extends the connecting shaft upward and allows it to pass through the connecting cover, so that both ends of the connecting shaft can be used for matching connection with the coupling or gear mechanism. This scheme form makes it possible for the connecting shaft of the rotor to be switched and adapted for motors with different rotation directions by simply flipping the connecting seat and the second connecting shell and the connecting cover (that is, the pump head structure connected to the gear mechanism) connected thereto, so that the structure of this scheme can be suitable for motors with different rotation directions without prior customization. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0048] Figure 1 This is one of the schematic diagrams of the simplified implementation structure of Example 1 of the present invention;

[0049] Figure 2 This is one of the schematic diagrams of the explosion structure of Example 1 of the present invention;

[0050] Figure 3 This is the second schematic diagram of the simplified explosion structure of Example 1 of the present invention;

[0051] Figure 4 This is the third schematic diagram of the simplified explosion structure of Example 1 of the present invention;

[0052] Figure 5 This is a schematic diagram of the cross-section structure of Example 1 of the present invention;

[0053] Figure 6This is a second schematic diagram of the simplified implementation structure of Example 1 of the present invention, wherein the first connecting housing and the third connecting housing are omitted, and in addition, it shows one of the mating states of the gear mechanism;

[0054] Figure 7 This is a third schematic diagram of a simplified implementation structure of Example 1 of the present invention, wherein the first connecting housing and the third connecting housing are omitted, and in addition, it shows another matching state of the gear mechanism;

[0055] Figure 8 This is a third schematic diagram of a simplified implementation structure of Example 1 of the present invention, wherein the connection cover is hidden;

[0056] Fig. 9 This is one of the simplified implementation diagrams of the gear mechanism of Example 1 of the present invention;

[0057] Fig.10 This is a second simplified implementation diagram of the gear mechanism of Example 1 of the present invention;

[0058] Fig.11 A simplified cross-sectional schematic diagram of the connection portion between the connection seat and the connection shaft of the present invention;

[0059] Fig.12 This is one of the simplified implementation diagrams of the gear mechanism of Example 2 of the present invention, wherein some parts are perspective diagrams and only the gear mechanism and some structures connected to the gear mechanism are shown;

[0060] Fig.13 The second schematic cross-sectional diagram of the gear mechanism of the second embodiment of the present invention, wherein some parts are perspective diagrams and only the gear mechanism and the partial structure connected to the gear mechanism are shown;

[0061] Fig.14 A schematic diagram of one of the states of installation of the connection socket of Embodiment 2 of the present invention;

[0062] Fig.15 A schematic diagram of another state of installation of the connecting socket of Embodiment 2 of the present invention;

[0063] Fig.16 This is a simplified cross-sectional structural diagram of Example 2 of the present invention. DETAILED DESCRIPTION

[0064] Example 1

[0065] like Figures 1 to 11 As shown in one of the figures, the present invention is an oil and gas recovery vacuum pump, which is connected in a fuel dispenser and is used to provide the negative pressure required for the fuel dispenser to recover oil and gas, and comprises:

[0066] Motor 1;

[0067] The first connecting housing 2 is a cylindrical structure, one end of which is fixed to the end surface of the motor 1 provided with a rotating shaft;

[0068] The gear mechanism 3 is fixed in the first connecting housing 2 and one end of which is connected to the rotating shaft of the motor 1;

[0069] A coupling 6, one end of which is connected to the other end of the gear mechanism 3;

[0070] The connecting seat 4 is fixedly arranged at the other end of the first connecting shell 2, and a first sinking groove 461 and a second sinking groove 462 are symmetrically arranged on the end surface of the connecting seat 4 away from the first connecting shell 2;

[0071] The second connecting shell 46 is a cylindrical structure, one end of which is fixedly abutted on the connecting seat 4 and surrounds the first sinking groove 461 and the second sinking groove 462;

[0072] A first connector 41, one end of which is fixed to one side of the connecting seat 4 and communicated with the first sink 461;

[0073] A second connector 43, one end of which is fixed to the other side of the connecting seat 4 and communicates with the second sink 462;

[0074] The rotor 5 is a circular structure and is eccentrically rotatably mounted on the end surface of the connecting seat 4 away from the first connecting shell 2 through the connecting shaft 7. The upper end surface of the rotor 5 is flush with the upper end surface of the second connecting shell 46.

[0075] A connecting cover 45, which is arranged on the upper end surface of the second connecting shell 46, and seals the rotor 5 in the second connecting shell 46;

[0076] A pair of push plates 52, wherein the upper end surface of the rotor 5 is provided with a pair of oppositely arranged slide grooves 51, and the slide grooves 51 extend along the edge of the rotor 5 and form an opening, the pair of slide grooves 51 correspond to the pair of push plates 52 one by one, and the push plates 52 are slidably connected in the slide grooves 51, and the end of the push plate 52 away from the center of the rotor 5 is an arc-shaped structure 521;

[0077] The lower end of the connecting shaft 7 passes through the connecting seat 4 and is connected to the other end of the coupling 6, and the motor 1 drives the gear mechanism 3 to drive the coupling 6 to pull the rotor 5 to rotate eccentrically, so that a pair of push plates 52 are disengaged due to the centrifugal force and stick to the inner wall of the second connecting shell 46, so that the air in the first sink groove 461 is pushed into the second sink groove 462 and output from the second joint 43, or the air in the second sink groove 462 is pushed into the first sink groove 461 and output from the first joint 41.

[0078] In order to prevent the connecting shaft 7 from moving when rotating, the connecting seat 4 is provided with a cylindrical extension portion 72 corresponding to the position where the connecting shaft 7 passes through, and an annular groove is provided on the circumference of the cylindrical extension portion 72, and a retaining spring 71 that is engaged with the connecting shaft is provided in the annular groove.

[0079] As one possible implementation of the gear mechanism 3, further, the gear mechanism 3 includes:

[0080] A connecting plate 33, fixed in the first connecting shell 2;

[0081] The first gear set 36 includes a pair of gears that are opposite to each other and fixedly connected to each other, and is rotatably connected to the upper end surface of the connecting plate 33 through a first rotating shaft 361. The upper end of the first rotating shaft 361 is connected to the coupling 6;

[0082] A second rotating shaft 371, rotatably connected to one side of the first gear set 36;

[0083] The transition gear 37 is fixed to the upper end of the second rotating shaft 371 and meshes with the gear at the upper end of the first gear set 36;

[0084] A third rotating shaft 351, one end of which is connected to the rotating shaft of the motor 1, and the other end of which passes through the upper end surface of the connecting plate 33;

[0085] The second gear set 35 includes a pair of gears that are opposite to each other and fixedly connected to each other, and are slidably sleeved on the other end of the third rotating shaft 351 through a key connection;

[0086] The shift fork 39 has one end as a shift end and is constrainedly connected between the two gears of the second gear set 35, and drives the second gear set 35 to slide up on the third rotating shaft 351, so that the gear at the upper end of the second gear set 35 meshes with the transition gear 37 on the second rotating shaft 371, or drives the second gear set 35 to slide up and down on the third rotating shaft 351, so that the gear at the lower end of the second gear set 35 meshes with the gear at the lower end of the first gear set 36;

[0087] A guide rod 391, the lower end of which passes through the middle of the shift fork 39 and is fixed on the connecting plate 33;

[0088] The screw rod 38 has a lower end that is rotatably connected to the connecting plate 33 through a connecting block 342, and an upper end that vertically extends upward and is threadedly connected to the other end of the shift fork 39. The rotation of the screw rod 38 drives the shift fork 39 to rise and fall. A slot is provided on one side of the connecting block 342.

[0089] One end of the hook 34 is rotatably connected to the connecting plate 33 through a torsion spring 341 , and the other end is used to be constrained and matched with a slot on the connecting block 342 .

[0090] As a preferred embodiment, preferably, a third connecting shell 32 is fixedly mounted on the connecting plate 33, and the first gear set 36, the second gear set 35 and the transition gear 37 are not higher than the upper end surface of the third connecting shell 32, and the upper end of the first rotating shaft 361 passes through the third connecting shell 32 and is connected to the coupling 6.

[0091] To facilitate fixation, as a preferred embodiment, the third connecting shell 32 is preferably fixedly connected to the first connecting shell 2 via the first connecting portion 31, and the first connecting shell 2 is correspondingly provided with a second connecting portion 22 that cooperates with the third connecting shell 32, and the first connecting portion 31 can be connected to the second connecting portion 22 via screws.

[0092] In order to stabilize the gas flow between the first joint 41 and the second joint 43, as a possible implementation, further, the present solution also includes:

[0093] The one-way valve 42 is connected to the first connector 41 and makes the first connector 41 form a gas outlet, and the second connector 43 can be connected to a flame arrester 44 to facilitate docking with an external device. A flame arrester is also provided between the one-way valve 42 and the first connector 41;

[0094] Under this structure, the motor 1 drives the gear mechanism 3 to drive the coupling 6 to pull the rotor 5 to rotate eccentrically, so that the pair of push plates 52 are disengaged due to the centrifugal force and stick to the inner wall of the second connecting shell 46, so that the air in the second sink groove 462 is pushed into the first sink groove 461 and output from the first joint 41. At the same time, negative pressure is formed in the second sink groove 462 and air is sucked out through the second joint 43.

[0095] In order to prevent the air pressure in the first sink 461 and the second sink 462 from being excessively unbalanced when the rotor 5 rotates at high speed, causing excessive pressure inside the second connecting shell 46, as a possible implementation method, the first sink 461 and the second sink 462 are further connected through a pressure relief valve 463.

[0096] As a possible implementation mode, further, the present solution also includes a plurality of first connecting bolts 21 arranged in a circular array and a plurality of second connecting bolts 464 arranged in a circular array. The first connecting bolts 21 sequentially pass through the connecting seat 4 and the first connecting shell 2 to fix the connecting seat 4 and the first connecting shell 2 to the motor 1. The second connecting bolts 464 sequentially pass through the connecting cover 45 and the second connecting shell 46 to fix the connecting cover 45 and the second connecting shell 46 to the connecting seat 4.

[0097] In order to improve air tightness, O-rings 47 and 48 are provided between the second connection housing, the connection cover 45 and the connection seat 4 . Meanwhile, an oil seal and a bearing are provided at the portion where the connection shaft 7 passes through the connection seat 4 .

[0098] The brief working principle of this scheme is:

[0099] The motor 1 rotates, driving the third rotating shaft 351 to rotate, so that the second gear set 35 key-connected to the third rotating shaft 351 rotates, and the preset state of the second gear set 35 can be set so that the gear at the bottom thereof meshes with the gear at the bottom of the first gear set 36. At this time, the motor directly drives the second gear set 35 to drive the first gear set to rotate, so that the rotor rotates;

[0100] When the rotation direction of the rotor 5 needs to be adjusted in the reverse direction, it is only necessary to rotate the screw rod 38 to make the fork 39 rise, and at the same time drive the second gear set 35 to rise, so that the gear on the upper part of the second gear set 35 is engaged with the transition gear 37 connected to the upper part of the second rotating shaft 371. In addition, the screw rod 38 can be constrained and fixed by the hook 34, so that the internal meshing structure of the gear mechanism 3 can be adjusted to make the rotor 5 rotate in the reverse direction.

[0101] by Figure 8 For motion reference, the rotor 5 is driven by the motor 1 to rotate counterclockwise, causing a pair of push plates 52 to escape due to centrifugal force and stick to the inner wall of the second connecting shell 46, so that the air in the second sink groove 462 is pushed into the first sink groove 461. Since one side of the rotor 5 sticks to the inner wall of the second connecting shell 46, the air pushed into the first sink groove 461 is compressed, thereby forming a positive pressure, so that the gas is output from the first joint 41, and the gas in the second sink groove 462 is pushed away, so a negative pressure is formed, so that the gas will enter from the second joint 43 again, and then replenished back to the second sink groove 462. In this way, the technical effect that the second joint 43 draws the gas into the second connecting shell 46 and outputs it from the first joint 41 is achieved.

[0102] The function of the pressure relief valve 463 is that when the second sink 462 is isolated from the first sink 461, the gas begins to be compressed and the volume gradually decreases. When the compressed gas exceeds the exhaust pressure, the pressure relief valve 463 is pushed open by the compressed gas, and the gas passes through part of it and is sent back to the second sink 462, so as to prevent the inner second connecting shell 46 from being deformed due to excessive pressure or causing other adverse operating conditions.

[0103] Example 2

[0104] like Figures 12 to 16 As shown in FIG. 1 , this embodiment is substantially the same as the embodiment 1, except that this solution further provides another possible implementation of the gear mechanism 3, which is mainly: the coupling 305 and the gear mechanism 3 are interchanged in position, one end of the coupling 6 is connected to the rotating shaft of the motor 1, the other end of the coupling 6 is connected to one end of the gear mechanism 3, and the other end of the gear mechanism 3 is connected to the connecting shaft 7;

[0105] The gear mechanism 3 comprises:

[0106] A connecting sleeve 32, the upper end of which is fixedly connected to the connecting shaft connected to the rotor through a connecting piece 305, and a ring gear structure 321 is provided on the inner circumference of the connecting sleeve 32;

[0107] A pair of support plates 301, which are annular structures and are respectively fixed to the upper and lower ends of the connecting sleeve 32;

[0108] A plurality of traction gears 304 are rotatably connected between a pair of support plates 301 in an annular array and are all meshed with an annular gear structure 321 in the connecting sleeve 32;

[0109] One end of the traction shaft 3021 is connected to the other end of the coupling 6, and the other end is inserted into the connecting sleeve 32 and meshed with a plurality of traction gears 304 through the main driving gear 302. The motor drives the coupling 6 to pull the traction shaft 3021 to drive the main driving gear 302 to drive the plurality of traction gears 304 to rotate, so that the traction gear 304 pulls the connecting sleeve 32 to drive the connecting shaft 7 to rotate.

[0110] Among them, in this embodiment, as a preferred implementation mode, preferably, the number of the traction gears 304 is three.

[0111] In addition, combined Fig.14 and Fig.15 As shown, in order to facilitate adaptation to motors of different rotation directions, as a preferred embodiment, preferably, the connecting shaft 7 extends in a direction close to the connecting cover 45 and passes through the connecting cover 45 and can be used to cooperate with the gear mechanism 3 for connection; this scheme allows the connecting shaft 7 of the rotor to be switched and adapted for motors 1 of different rotation directions by simply flipping the connecting seat 4 and the second connecting shell 46 and the connecting cover 45 (i.e., the pump head structure connected to the gear mechanism 3) connected thereto, so that the structure of this scheme can be applied to motors 1 of different rotation directions without prior customization. In this case, in order to prevent the connecting shaft 7 from moving when it rotates, anti-movement retaining springs are provided on the portions of the connecting shaft 7 corresponding to the portions passing through the connecting seat 4 and the connecting cover 45, and bearings and oil seals are also provided at both ends of the connecting shaft 7.

[0112] Combining the above two embodiments, this solution ingeniously utilizes the cooperation of the motor 1, the gear mechanism 3, the coupling 6, the connecting seat 4, the second connecting shell 46, the rotor 5 and the push plate 52, and the rotor 5 is rotatably connected to the connecting seat 4 through the connecting shaft 7, the lower end of the connecting shaft 7 passes through the connecting seat 4 and is connected to the other end of the coupling 6, and the motor 1 drives the gear mechanism 3 to drive the coupling 6 to pull the rotor 5 to rotate eccentrically, so that the pair of push plates 52 are separated by the centrifugal force and stick to the inner wall of the second connecting shell 46, so that the first sink 461 The air in the second sink 462 is pushed into the second sink 462 and output from the second joint 43, or the air in the second sink 462 is pushed into the first sink 461 and output from the first joint 41, and the gear mechanism 3 cooperates with the first gear set 36, the second shaft 371, the transition gear 37, the third shaft 351, the second gear set 35 and the shift fork 39, and the shift fork 39 drives the second gear set 35 to slide up on the third shaft 351, so that the gear at the upper end of the second gear set 35 meshes with the transition gear 37 on the second shaft 371, or with The second gear set 35 is driven to slide up and down on the third rotating shaft 351, so that the gear at the lower end of the second gear set 35 is meshed with the gear at the lower end of the first gear set 36, so as to realize that the motor 1 with different rotation directions is adapted to the rotation direction of the rotor 5 of this scheme, and the first sink groove 461 and the second sink groove 462 of the connecting seat 4 are symmetrically designed. Therefore, based on this scheme, the gear mechanism 3 of this scheme can also be a planetary structure. This scheme also extends the connecting shaft 7 upward and allows it to pass through the connecting cover 45, so that both ends of the connecting shaft 7 can be used for matching connection with the coupling 6 or the gear mechanism 3. This scheme form makes the connecting shaft 7 of the rotor 5 only need to flip the connecting seat 4 and the second connecting shell 46 and the connecting cover 45 (that is, the pump head structure connected to the motor 1) connected thereto for motors 1 with different rotation directions to achieve switching adaptation, so that the structure of this scheme can be applicable to motors 1 with different rotation directions without prior customization; in addition, the gear mechanism 3 plays a deceleration role to a certain extent, which effectively alleviates the instantaneous impact caused by the motor 1 directly driving the rotor 5.

[0113] The above is an embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, all equivalent changes, modifications, substitutions and variations made within the scope of the patent application of the present invention without departing from the principles and spirit of the present invention should fall within the scope of the present invention.

Claims

1. An oil and gas recovery vacuum pump, connected in a fuel dispenser and used to provide the negative pressure required for the fuel dispenser to recover oil and gas, characterized in that: It includes: Motor; The first connecting shell is a cylindrical structure, one end of which is fixed to the end surface of the motor provided with the rotating shaft; A gear mechanism is fixed in the first connecting housing and one end of which is connected to the rotating shaft of the motor; A coupling, one end of which is connected to the other end of the gear mechanism; A connecting seat is fixedly arranged at the other end of the first connecting shell, and a first sinking groove and a second sinking groove are symmetrically arranged on an end surface of the connecting seat away from the first connecting shell; The second connecting shell is a cylindrical structure, one end of which is fixedly abutted on the connecting seat and surrounds the first sinking groove and the second sinking groove; A first joint, one end of which is fixed to one side of the connecting seat and communicated with the first sink; A second joint, one end of which is fixed to the other side of the connecting seat and communicated with the second sink; The rotor is a circular structure and is eccentrically rotatably mounted on the end surface of the connecting seat away from the first connecting shell through the connecting shaft, and the upper end surface of the rotor is flush with the upper end surface of the second connecting shell; A connecting cover, which is arranged on the upper end surface of the second connecting shell and seals the rotor in the second connecting shell; A pair of push plates, wherein the upper end surface of the rotor is provided with a pair of oppositely arranged slide grooves, and the slide grooves extend along the edge of the rotor and form an opening, the pair of slide grooves correspond to the pair of push plates one by one, and the push plates are slidably connected in the slide grooves, and the ends of the push plates away from the center of the rotor are arc-shaped structures; The lower end of the connecting shaft passes through the connecting seat and is connected to the other end of the coupling, and the motor drives the gear mechanism to drive the coupling to pull the rotor to rotate eccentrically, so that the pair of push plates are separated by centrifugal force and stick to the inner wall of the second connecting shell, so that the air in the first sink is pushed into the second sink and discharged from the second joint, or the air in the second sink is pushed into the first sink and discharged from the first joint; The gear mechanism comprises: A connecting plate, fixed in the first connecting shell; The first gear set includes a pair of gears which are opposite to each other and fixedly connected to each other, and are rotatably connected to the end surface of the connecting plate through a first rotating shaft, and the upper end of the first rotating shaft is connected to the coupling; A second rotating shaft, rotatably connected to one side of the first gear set; A transition gear, fixed to the upper end of the second rotating shaft and meshing with the gear at the upper end of the first gear set; A third rotating shaft, one end of which is connected to the rotating shaft of the motor, and the other end of which passes through the upper end surface of the connecting plate; The second gear set includes a pair of gears that are opposite to each other and fixedly connected to each other, and are slidably sleeved on the other end of the third rotating shaft through a key connection; A shift fork, one end of which is a shift end and is constrainedly connected between the two gears of the second gear set, and drives the second gear set to slide up on the third rotating shaft so that the gear at the upper end of the second gear set meshes with the transition gear on the second rotating shaft, or drives the second gear set to slide up and down on the third rotating shaft so that the gear at the lower end of the second gear set meshes with the gear at the lower end of the first gear set; A guide rod, the lower end of which passes through the middle of the shift fork and is fixed on the connecting plate; The screw rod has a lower end that is rotatably connected to the connecting plate through a connecting block, and an upper end that extends vertically upward and is threadedly connected to the other end of the shift fork. The rotation of the screw rod drives the shift fork to rise and fall, and a slot is provided on one side of the connecting block; A hook, one end of which is rotatably connected to the connecting plate through a torsion spring, and the other end of which is used to restrain and cooperate with a slot on the connecting block; The first sink and the second sink are also connected via a pressure relief valve.

2. The oil vapor recovery vacuum pump according to claim 1, characterized in that: The connecting plate is also fixedly sleeved with a third connecting shell, the first gear set, the second gear set and the transition gear are not higher than the upper end surface of the third connecting shell, and the upper end of the first rotating shaft passes through the third connecting shell and is connected to the coupling.

3. The oil vapor recovery vacuum pump according to claim 2, characterized in that: The third connection shell is fixedly connected to the first connection shell via a first connection portion, and the first connection shell is correspondingly provided with a second connection portion that matches the third connection shell.

4. The oil vapor recovery vacuum pump according to claim 1, characterized in that: It also includes: A one-way valve connected to the first connector to form an air outlet; The motor-driven gear mechanism drives the coupling to pull the rotor to rotate eccentrically, causing a pair of push plates to break away from the centrifugal force and stick to the inner wall of the second connecting shell, so that the air in the second sink is pushed into the first sink and output from the first joint. At the same time, negative pressure is formed in the second sink and air is sucked out through the second joint.

5. The oil vapor recovery vacuum pump according to claim 1, characterized in that: It also includes a plurality of first connecting bolts arranged in a circular array and a plurality of second connecting bolts arranged in a circular array. The first connecting bolts sequentially pass through the connecting seat and the first connecting shell to fix the connecting seat and the first connecting shell to the motor. The second connecting bolts sequentially pass through the connecting cover and the second connecting shell to fix the connecting cover and the second connecting shell to the connecting seat.

6. A fuel dispenser, characterized in that: It comprises the oil and gas recovery vacuum pump as claimed in any one of claims 1 to 5.

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