Coupling, oil gas recovery pump and oiling machine

Abstract

The utility model discloses a coupler, an oil and gas recovery pump and an oiling machine, and provides the coupler for the oil and gas recovery pump ingeniously, and the coupler serves as a power transition part between a negative pressure generating assembly and a motor driving assembly of the oil and gas recovery pump. The step part and the positioning column which are arranged on the main body part of the coupler can improve the positioning efficiency during installation of the coupler, and meanwhile, when transmission force is transmitted for work of the coupler, stable power transmission guarantee is provided, and the abnormities such as loosening and lateral displacement are avoided; according to the scheme, a mounting positioning rod is arranged on the driving motor for the motor driving assembly, a mounting positioning hole is adaptively formed in a first shell of the motor driving assembly to be matched with the mounting positioning rod, and a spring is arranged at the bottom of the driving motor to abut against the driving motor, so that after the driving motor is mounted, the mounting positioning rod is fixed; in the working process, the abnormal conditions that the driving motor laterally moves and moves due to mechanical vibration are avoided, and the negative pressure generating assembly and the motor driving assembly of the device in the scheme can be conveniently and independently disassembled and overhauled.

Description

Technical Field

[0001] The utility model relates to the fields of power transmission devices, pumps and refueling equipment, in particular to a coupling, an oil and gas recovery pump and a refueling machine. Background Art

[0002] Oil and gas recovery in gas dispensers is a popular energy-saving and environmentally friendly method for refueling equipment. It installs an oil and gas recovery pipeline on the fuel gun of the gas dispenser and combines it with a negative pressure device to attract and recover the oil and gas generated during refueling, so as to avoid oil and gas overflow from the fuel gun during refueling. Preventing oil and gas overflow can effectively improve the air cleanliness of gas stations on the one hand, and eliminate the safety hazards of large-scale oil and gas leakage on the other hand, while reducing the loss of usable energy. Although there are some oil and gas recovery pumps for gas dispensers on the market, most of the current oil and gas recovery pumps for gas dispensers have a relatively complex transmission structure. After long-term operation, they often require frequent maintenance or replacement of parts due to wear and tear of parts. Among them, the negative pressure generating assembly and the drive motor assembly are important components of the oil and gas recovery pump. The drive motor assembly is used to provide power. After the power is transmitted to the negative pressure generating assembly through the transmission parts, the negative pressure generating assembly generates the negative pressure required for oil and gas recovery.

[0003] Most traditional oil and gas recovery pumps directly connect the drive shaft of the drive motor assembly with the negative pressure generating assembly. Under this structural form, once the negative pressure generating assembly or the motor of the drive motor assembly fails, the two need to be disassembled separately, which is not only time-consuming and labor-intensive, but also requires density or work debugging after disassembly and reassembly. In order to overcome this problem, some researchers have proposed a structural form of connecting the negative pressure generating assembly and the drive motor assembly with a coupling. However, there are still some problems of cumbersome coordination and inconvenient disassembly and assembly. Therefore, how to optimize the structure of the power transition part of the oil and gas recovery pump so that it has good power transmission reliability and the advantage of easy disassembly and assembly is a very positive and practical research topic. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a coupling, an oil and gas recovery pump and a fuel dispenser.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by this utility model are:

[0006] A coupling is applied to a gas recovery pump of a fuel dispenser. The gas recovery pump includes a drive motor assembly and a negative pressure generating assembly. The drive motor assembly is provided with a drive shaft for outputting driving force, and the negative pressure generating assembly has an input shaft for inputting negative pressure driving power. The coupling is provided between the drive motor assembly and the negative pressure generating assembly and is connected to the drive shaft of the drive motor assembly and the input shaft of the negative pressure generating assembly, respectively. The coupling includes:

[0007] The main body is a circular plate-shaped structure, with raised step portions provided on both opposite end faces, and a raised positioning column provided on the middle of the end face of the step portion away from the main body;

[0008] The end of the drive shaft of the drive motor assembly is provided with a first fitting portion adapted to the profile of the step portion, and the bottom of the first fitting portion is provided with a first positioning hole adapted to the structure of the positioning post. The step portion on one end surface of the main body is inserted into the first fitting portion, and at the same time, the positioning post thereon is inserted into the first positioning hole, thereby constraining one end of the main body to be connected to the drive shaft.

[0009] The end of the input shaft of the negative pressure generating component is provided with a second fitting portion adapted to the contour of the step portion, and the bottom of the second fitting portion is provided with a second positioning hole adapted to the structure of the positioning column. The step portion on the other end face of the main body is inserted into the second fitting portion. At the same time, the positioning column thereon is inserted into the second positioning hole, constraining the other end of the main body to be connected to the input shaft, so that when the driving shaft of the drive motor assembly rotates, it drives the input shaft to rotate through the main body, so that the negative pressure generating component inputs driving force.

[0010] As a possible implementation manner, further, the main body of the coupling described in this solution and the step portion and positioning column thereon are all integrally formed structures, and their hardness is smaller than that of the drive shaft and the input shaft.

[0011] Based on the above, the present solution also provides an oil and gas recovery pump, which includes a drive motor assembly and a negative pressure generating assembly, wherein the drive motor assembly is provided with a drive shaft for outputting driving force, and the negative pressure generating assembly has an input shaft for inputting negative pressure driving power, wherein the oil and gas recovery pump is applied with the coupling described above.

[0012] As a possible implementation, further, the drive motor assembly of this solution includes:

[0013] The first shell is a cylindrical shell structure with an open lower end;

[0014] The second housing is a cylindrical housing structure with an open upper end, the upper end of which is threadedly connected to the lower end of the first housing, and the second housing and the first housing form a mounting cavity;

[0015] The drive motor is arranged in the installation cavity, and the upper end surface of the main body of the drive motor is provided with a mounting positioning rod, and the interior of the first shell is provided with a mounting positioning hole corresponding to the mounting positioning rod and cooperating with the mounting positioning rod. The rotating shaft of the drive motor is set as a drive shaft, which passes through the first shell upward and is connected to the coupling; the first shell is provided with a first avoidance hole at a position corresponding to the position where the drive shaft of the drive motor passes through;

[0016] A spring is arranged in the installation cavity and is located at the bottom of the drive motor and the second shell. One end of the spring is against the bottom of the drive motor, and the other end of the spring is against the bottom of the second shell.

[0017] As a preferred implementation option, preferably, the driving motor in this solution is connected to a first cable, the first cable is arranged in the installation cavity, a first cable has multiple first conductors, and is connected to an external power supply through a cable assembly.

[0018] As a preferred implementation option, preferably, the cable assembly of this solution includes:

[0019] A second cable, one end of which is inserted into the installation cavity, wherein the second cable has multiple second conductors corresponding one-to-one with the first conductors, and one end of the second cable is detachably connected one-to-one with the multiple second conductors and one of the multiple first conductors of the first cable via a wiring assembly;

[0020] The first connecting sleeve is a rigid tubular structure with external thread structures at both ends, one end of which is threadedly connected to the upper portion of the first shell and communicates with the installation cavity, and the other end of which extends vertically upward;

[0021] The second connecting sleeve is a flexible connecting tube, one end of which has an internal thread structure and is threadedly connected to the other end of the first connecting sleeve. The other end of the second cable is led out of the installation cavity by passing through the first connecting sleeve and the second connecting sleeve in sequence and is used to connect to an external power supply.

[0022] As a preferred implementation option, preferably, the negative pressure generating assembly of this solution includes:

[0023] The third shell is a cylindrical structure with both ends open;

[0024] A rotor mechanism is disposed in the first housing, wherein the rotor mechanism and two sides of a maximum distance portion of an inner wall of the third housing form a first region and a second region that are interconnected;

[0025] a base fixedly connected to the lower portion of the third shell, wherein the lower portion of the base is also fixedly connected to the upper end surface of the first shell;

[0026] A connecting base is fixedly connected to the upper portion of the third shell, and a pair of air guide grooves are provided on an end surface of the connecting base close to the third shell, the air guide grooves being arranged opposite to each other and communicating with the first area and the second area in a one-to-one correspondence;

[0027] A first gasket is provided between the connecting seat and the upper end surface of the first shell and separates the pair of air guide grooves. The first gasket is provided with an avoidance groove adapted to its structure corresponding to the pair of air guide grooves;

[0028] The connecting joints are a pair and correspond to and are connected to the air guide grooves one by one;

[0029] An input shaft, one end of which is connected to the rotor mechanism, and the other end of which can rotatably pass through the base and is connected to the coupling, so that when the drive shaft of the drive motor assembly rotates, it drives the input shaft to rotate through the main body of the coupling, so that the rotor mechanism of the negative pressure generating assembly inputs a driving force, so that the gas in the first area is pushed to the second area and output by the corresponding air 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 air guide groove and connecting joint of the first area, so that negative pressure is generated in the second area.

[0030] As one of the preferred embodiments of the rotor mechanism, preferably, the rotor mechanism of this solution includes:

[0031] a rotor eccentrically disposed within the third housing, with its lower end surface abutting against an upper end surface of the base or forming a gap less than a preset value, wherein a first region and a second region are interconnected on both sides of a location of maximum spacing between the rotor and an inner wall of the third housing, and a plurality of radially extending slots are provided on a circumferential side of the rotor;

[0032] The blades are multiple and correspond one to one with the slots on the rotor and slide through the slots;

[0033] One end of the input shaft is connected to the rotor via a key or a stud, and a mounting hole connected to the input shaft is provided at the center of the rotor. The input shaft rotates to drive the rotor to rotate, causing the blades sliding through the slots on the rotor to rotate, so that the gas in the first area is pushed to the second area and output through the corresponding air guide grooves and connecting joints in the second area, thereby generating negative pressure in the first area, or the gas in the second area is pushed to the first area and output through the corresponding air guide grooves and connecting joints in the first area, thereby generating negative pressure in the second area.

[0034] As another preferred embodiment of the rotor mechanism, preferably, the rotor mechanism of this solution includes:

[0035] a rotor eccentrically disposed within the third housing, with its lower end surface abutting against the upper end surface of the base or forming a gap less than a preset value, wherein a first region and a second region are interconnected on both sides of a location of maximum spacing between the rotor and the inner wall of the third housing, and a plurality of radially extending arcuate movable grooves are provided on a circumferential side of the rotor;

[0036] The rollers are cylindrical in structure, and are in multiple number and correspond one-to-one with the arc-shaped movable grooves on the rotor and are movably arranged in the arc-shaped movable grooves;

[0037] One end of the input shaft is connected to the rotor via a key or a stud, and a mounting hole connected to the input shaft is provided at the center of the rotor. The input shaft rotates to drive the rotor to rotate, causing the rollers in the arc-shaped movable grooves on the rotor to rotate accordingly and, under the action of centrifugal force, to adhere to the inner wall of the third housing, so that the gas in the first area is pushed to the second area and output through the corresponding air guide grooves and connecting joints in the second area, thereby generating a negative pressure in the first area, or the gas in the second area is pushed to the first area and output through the corresponding air guide grooves and connecting joints in the first area, thereby generating a negative pressure in the second area.

[0038] Based on the above, the present solution also provides a fuel dispenser, which includes the oil and gas recovery pump described above.

[0039] By adopting the above-mentioned technical scheme, the present invention has the following beneficial effects compared with the prior art: the present scheme cleverly proposes a coupling for an oil and gas recovery pump of a refueling machine, which serves as a power transition component between the negative pressure generating component and the motor drive component of the oil and gas recovery pump. The step portion and positioning column arranged on the main body of the coupling can improve its positioning efficiency during installation, and also provide stable power transmission guarantee when it transmits transmission force during operation, avoiding abnormalities such as loosening and lateral displacement; and on this basis, the present scheme further proposes that an installation positioning rod be provided on the drive motor for the motor drive component, and an installation positioning hole is adaptively provided on the first shell of the motor drive component to cooperate with it, and a spring is provided at the bottom of the drive motor to abut it, so that after the drive motor is installed, the drive motor will not cause abnormal lateral displacement or movement due to mechanical vibration during its operation; at the same time, the coupling of the present scheme does not have an integrated locking structure during installation, so that the negative pressure generating component and the motor drive component of the device of the present scheme are convenient to be disassembled and repaired separately. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 This is a brief structural diagram of the coupling of this scheme;

[0042] Figure 2 This is a brief diagram of the coupling being installed between the input shaft of the negative pressure generating assembly of the oil and gas recovery pump and the drive shaft of the drive motor assembly;

[0043] Figure 3 This is one of the simplified exploded diagrams of the coupling installed between the input shaft of the negative pressure generating assembly of the oil and gas recovery pump and the drive shaft of the drive motor assembly;

[0044] Figure 4 This is the second simplified exploded diagram of the coupling installed between the input shaft of the negative pressure generating assembly of the oil and gas recovery pump and the drive shaft of the drive motor assembly;

[0045] Figure 5 This is a simplified cross-sectional diagram showing the coupling of this solution installed between the input shaft of the negative pressure generating assembly of the oil and gas recovery pump and the drive shaft of the drive motor assembly;

[0046] Figure 6 This is one of the simplified cross-sectional diagrams of the oil and gas recovery pump with coupling used in this solution;

[0047] Figure 7 This is a partial exploded schematic diagram of the simplified implementation structure of the oil and gas recovery pump with a coupling used in this solution;

[0048] Figure 8 This is the second schematic diagram of the simplified implementation structure of the oil and gas recovery pump with a coupling used in this solution;

[0049] Figure 9 This is a brief partial diagram of the connection between the first cable of the drive motor of the oil and gas recovery pump of this solution and the second cable of the cable assembly through the wiring assembly;

[0050] Figure 10 This is a brief diagram of one of the rotor mechanisms of the oil and gas recovery pump in this scheme;

[0051] Figure 11 This is a brief exploded structural diagram of one of the rotor mechanisms of the oil and gas recovery pump in this scheme;

[0052] Figure 12 This is a brief diagram of another rotor mechanism of the oil and gas recovery pump of this scheme. DETAILED DESCRIPTION

[0053] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be noted that the following examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Similarly, the following examples are merely partial embodiments of the present invention and are not intended to be exhaustive. All other embodiments derived by persons of ordinary skill in the art without inventive effort are intended to fall within the scope of protection of the present invention.

[0054] Combine Figures 1 to 5 As shown in FIG1 , this embodiment provides a coupling 100 for an oil and gas recovery pump of a fuel dispenser. The oil and gas recovery pump includes a drive motor assembly 200 and a negative pressure generating assembly 300. The drive motor assembly 200 is provided with a drive shaft 201 for outputting a driving force, and the negative pressure generating assembly 300 has an input shaft 301 for inputting a negative pressure driving power. The coupling 100 is provided between the drive motor assembly 200 and the negative pressure generating assembly 300, and is connected to the drive shaft 201 of the drive motor assembly 200 and the input shaft 301 of the negative pressure generating assembly 300, respectively. The coupling 100 includes:

[0055] The main body 101 is a circular plate-like structure, with raised step portions 102 provided on both opposite end surfaces. A raised positioning post 103 is provided in the middle of the end surface of the step portion 102 away from the main body 101;

[0056] The end of the driving shaft 201 of the driving motor assembly 200 is provided with a first fitting portion 2011 adapted to the contour of the step portion 102, and the bottom of the first fitting portion 2011 is provided with a first positioning hole 2012 adapted to the structure of the positioning column 103. The step portion 102 on one end surface of the main body 101 is inserted into the first fitting portion 2011, and the positioning column 103 thereon is inserted into the first positioning hole 2012, thereby constraining one end of the main body 101 to be connected to the driving shaft 201.

[0057] The end of the input shaft 301 of the negative pressure generating component 300 is provided with a second interlocking portion 3011 that is adapted to the contour of the step portion 102, and the bottom of the second interlocking portion 3011 is provided with a second positioning hole 3012 that is adapted to the structure of the positioning column 103. The step portion 102 on the other end face of the main body 101 is inserted into the second interlocking portion 3011. At the same time, the positioning column 103 thereon is inserted into the second positioning hole 3012, and the other end of the main body 101 is constrained to be connected to the input shaft 301, so that when the driving shaft 201 of the driving motor assembly 200 rotates, it drives the input shaft 301 to rotate through the main body 101, so that the negative pressure generating component 300 inputs driving force.

[0058] In this solution, the coupling 100 serves as an important component for transmitting the drive motor assembly 200. The main body 101 of the coupling 100 utilizes the step portions 102 at both ends to connect with the drive shaft 201 of the drive motor assembly 200 and the input shaft 301 of the negative pressure generating assembly 300, so that during the power transmission process, the coupling 100 can maintain a good coaxial state, and the positioning column 103 thereon can further avoid the risk of lateral displacement and slippage of the coupling 100.

[0059] In order to avoid abnormal deformation of the drive shaft 201 and the input shaft 301 during power transmission, as a possible implementation method, the main body 101 of the coupling 100 and the step portion 102 and the positioning column 103 thereon are all one-piece molded structures, and their hardness is less than that of the drive shaft 201 and the input shaft 301. The overall structure of the coupling 100 can be made of nylon or other plastic materials. In this way, once the output torque of the drive shaft 201 is too large, the main body 101 of the coupling 100 will break or be otherwise deformed, thereby avoiding stress damage to the input shaft 301. The coupling 100 is easy to disassemble and install, and has low cost, which improves the convenience and economy of maintenance. The coupling of this solution can also exist in other similar or different forms.

[0060] exist Figures 1 to 5 Based on the above, further combining Figures 6 to 9 As shown in one of the figures, the present solution also provides an oil and gas recovery pump, which includes a drive motor assembly 200 and a negative pressure generating assembly 300, wherein the drive motor assembly 200 is provided with a drive shaft 201 for outputting driving force, and the negative pressure generating assembly 300 has an input shaft 301 for inputting negative pressure driving power, wherein the oil and gas recovery pump is applied with the coupling 100 described above.

[0061] In terms of the implementation structure of the drive motor assembly 200, as a possible implementation, the drive motor assembly 200 of this solution further includes:

[0062] The first housing 202 is a cylindrical housing structure with an open lower end;

[0063] The second housing 203 is a cylindrical housing structure with an open upper end. Its upper end is threadedly connected to the lower end of the first housing 202, and the second housing 202 and the first housing 202 form a mounting cavity 204. A first O-ring 208 is provided at the threaded connection between the first and second housings 202, 203. To prevent the threads between the first and second housings 202, 203 from loosening during operation of the pump, a locking bolt 207 is threadedly inserted into the threaded connection.

[0064] The drive motor 205 is disposed in the mounting cavity 204. A mounting positioning rod 2052 is provided on the upper end surface of the main body of the drive motor 205. A mounting positioning hole 2022 is provided inside the first housing 202 corresponding to the mounting positioning rod 2052 and cooperating therewith. The rotating shaft of the drive motor 205 is set as a drive shaft 201, which passes through the first housing 202 upward and is connected to the coupling 100. The first housing 202 is provided with a first avoidance hole 2021 at the position corresponding to the position where the drive shaft 201 of the drive motor 205 passes through. In addition, the first housing 202 is provided with a flameproof joint surface 2023 with a constricted structure at the lower portion corresponding to the first avoidance hole 2021.

[0065] The spring 206 is arranged in the installation cavity 204 and is located at the bottom of the drive motor 205 and the second shell 203. One end of the spring 206 is against the bottom of the drive motor 205, and the other end of the spring 206 is against the bottom of the second shell 203. It can also be other structural forms that make the drive motor 205 against the upper part of the first shell 202.

[0066] In this solution, the spring 206 can keep the upper part of the drive motor 205 in contact with the inside of the first shell 202 after installation to prevent it from moving. At the same time, the installation positioning rod 2052 can further provide movement restriction constraints, thereby ensuring the efficient and convenient installation and reliability of the drive motor 205.

[0067] In terms of line connection, as a better implementation option, preferably, the driving motor 205 described in this solution is connected to a first cable 2051, and the first cable 2051 is arranged in the installation cavity 204. A first cable has multiple strands of first conductors and is connected to an external power supply through a cable assembly 400.

[0068] As a preferred implementation option, preferably, the cable assembly 400 of this solution includes:

[0069] The second cable 401 is a multi-strand wire structure, one end of which is inserted into the installation cavity 204. The second cable has multiple second wires 402 that correspond one-to-one with the first wires. One end of the second cable 401 is connected to the multi-strand first wire of the first cable 2051 through a wiring assembly 4021 to detachably connect the multiple second wires 402 to the first wire of the first cable 2051.

[0070] The first connecting sleeve 404 is a rigid tubular structure with external threads at both ends. One end of the first connecting sleeve 404 is threadedly connected to the upper portion of the first housing 202 and communicates with the installation cavity 204, and the other end of the first connecting sleeve 404 extends vertically upward.

[0071] The second connecting sleeve 403 is a flexible connecting tube, one end of which has an internal thread structure and is threadedly connected to the other end of the first connecting sleeve 404. The other end of the second cable 401 passes through the first connecting sleeve 404 and the second connecting sleeve 403 in sequence, leads out of the installation cavity 204 and is used to connect to an external power supply.

[0072] As an example of a preferred implementation of the negative pressure generating assembly 300, preferably, the negative pressure generating assembly 300 of this solution includes:

[0073] The third housing 302 is a cylindrical structure with two ends open, and is made of metal;

[0074] The rotor mechanism 303 is disposed in the first housing 202 , and the rotor mechanism 303 and the inner wall of the third housing 302 are located at the maximum distance therebetween, forming a first region 3021 and a second region 3022 that are interconnected;

[0075] The base 304 is fixedly connected to the lower portion of the third shell 302. The lower portion of the base 304 is also fixedly connected to the upper end surface of the first shell 202. To improve the installation convenience of the base 304, a positioning rod 3042 is further provided at the lower end of the base 304. The upper portion of the first shell 202 is provided with a positioning groove 2024 corresponding to the positioning rod 3042.

[0076] The connecting base 305 is fixedly connected to the upper portion of the third housing 302. A pair of air guide grooves 3051 are provided on the end surface of the connecting base 305 proximal to the third housing 302, and are in one-to-one communication with the first region 3021 and the second region 3022. In this embodiment, to improve the sealing between the base 304 and the connecting base 305 and the third housing 302, a second O-ring 3051 is provided between them.

[0077] A first gasket 307B is provided between the connecting seat 305 and the upper end surface of the first housing 202 and separates the pair of air guide grooves 3051. The first gasket 307B is provided with avoidance grooves corresponding to the pair of air guide grooves 3051 to adapt to its structure;

[0078] The connecting joints 3091 are a pair and are connected to the air guide grooves 3051 in a one-to-one correspondence through the flame arrester 309;

[0079] The input shaft 301 has one end connected to the rotor mechanism 303, and the other end can be rotatably passed through the base 304 and connected to the coupling 100, so that when the drive shaft 201 of the drive motor assembly 200 rotates, it drives the input shaft 301 to rotate through the main body 101 of the coupling 100, so that the rotor mechanism 303 of the negative pressure generating assembly 300 inputs a driving force, so that the gas in the first area 3021 is pushed to the second area 3022 and output by the air guide groove 3051 and the connecting joint 3091 corresponding to the second area 3022, so that negative pressure is generated in the first area 3021, or the gas in the second area 3022 is pushed to the first area 3021 and output by the air guide groove 3051 and the connecting joint 3091 corresponding to the first area 3021, so that negative pressure is generated in the second area 3022.

[0080] In this solution, since the rotor mechanism 303 generates heat and causes internal thermal expansion when it rotates, in order to improve its working reliability, the base 304 is provided with a thermal expansion groove corresponding to the lower part of the rotor mechanism 303, with a depth of about 0.01 to 0.03 mm, and a second gasket 307A is also provided on it to fit the rotor mechanism 303; and the first gasket 307B and the second gasket 307A are both wear-resistant gaskets.

[0081] In order to improve the sealing and reliability of the base 304 where the input shaft 301 passes through, the base 304 is correspondingly provided with a through groove 3041 for the input shaft 301 to pass through. An oil seal 306A is provided at the upper part of the through groove 3041, and at least one bearing 306C is provided at the lower part. The input shaft 301 is provided with a first retaining spring 306B in the middle part of the through groove 3041; a second retaining spring 306D is provided at the lower part of the input shaft 301, which is used to prevent the input shaft 301 from moving during rotation.

[0082] On the basis of the above, combined with Figure 10 or Figure 11 As shown in FIG. 3 , as a preferred embodiment of the rotor mechanism 303 , preferably, the rotor mechanism 303 of this solution includes:

[0083] The rotor 3031 is eccentrically disposed within the third housing 302, with its lower end surface abutting against the upper end surface of the base 304 or forming a gap less than a preset value. A first region 3021 and a second region 3022 are interconnected on either side of the maximum distance between the rotor 3031 and the inner wall of the third housing 302. The rotor 3031 is provided with a plurality of radially extending arcuate movable grooves 30311 on its circumference. A boss 30311 is provided on its upper portion for engagement with the first gasket 307B.

[0084] The rollers 3032A are cylindrical in structure. There are multiple rollers 3032A, which correspond one-to-one with the arc-shaped movable grooves 30311 on the rotor 3031 and are movably disposed in the arc-shaped movable grooves 30311. The rollers 3032A are magnetic rollers. Adjacent rollers 3032A are of the same polarity and face each other, generating a mutual repulsive force to maintain contact with the inner wall of the third housing 302.

[0085] One end of the input shaft 301 is connected to the rotor 3031 via a key 3013 or a stud. A mounting hole for connection to the input shaft 301 is provided at the center of the rotor 3031. Rotation of the input shaft 301 drives the rotor 3031, causing the rollers 3032A in the arcuate movable grooves 30311 on the rotor 3031 to rotate accordingly and, under the action of centrifugal force, to abut against the inner wall of the third housing 302. This causes gas within the first region 3021 to be moved to the second region 3022 and discharged through the corresponding gas guide grooves 3051 and connecting joint 3091 of the second region 3022, thereby generating a negative pressure within the first region 3021. Alternatively, gas within the second region 3022 is moved to the first region 3021 and discharged through the corresponding gas guide grooves 3051 and connecting joint 3091 of the first region 3021, thereby generating a negative pressure within the second region 3022.

[0086] In the aforementioned Figures 1 to 9 Based on the shown Figure 12 As shown in FIG. 3 , as another preferred embodiment of the rotor mechanism 303 , preferably, the rotor mechanism 303 in this embodiment includes:

[0087] The rotor 3031 is eccentrically disposed within the third housing 302, with its lower end surface abutting against the upper end surface of the base 304 or forming a gap less than a preset value. A first region 3021 and a second region 3022 are formed on either side of the maximum distance between the rotor 3031 and the inner wall of the third housing 302. A plurality of radially extending slots 3031B are defined around the circumference of the rotor 3031.

[0088] The blades 3032B are multiple and correspond one-to-one with the slots 3031B on the rotor 3031 and are slidably inserted into the slots 3031B. In this embodiment, the number of the blades 3032B can be three or more.

[0089] One end of the input shaft 301 is connected to the rotor 3031 via a key 3013 or a stud. A mounting hole connected to the input shaft 301 is provided at the center of the rotor 3031. The input shaft 301 rotates to drive the rotor 3031 to rotate, causing the blades 3032B sliding through the slots 3031B on the rotor 3031 to rotate, so that the gas in the first area 3021 is pushed to the second area 3022 and output through the corresponding gas guide grooves 3051 and connecting joints 3091 of the second area 3022, thereby generating a negative pressure in the first area 3021, or the gas in the second area 3022 is pushed to the first area 3021 and output through the corresponding gas guide grooves 3051 and connecting joints 3091 of the first area 3021, thereby generating a negative pressure in the second area 3022.

[0090] As an example, in this solution, the blades 3032B can adopt a magnetic metal structure, the outer surface of which is covered with a layer of wear-resistant plastic. Adjacent blades 3032B repel each other with the same polarity, so that they can maintain contact with the inner wall of the third shell 302.

[0091] Figure 12 The structure shown is only Figure 10 、 Figure 11 The rotor mechanism shown in the example has different parts, and the other structures are almost the same, so they will not be described or illustrated in detail.

[0092] Based on the above, the oil and gas recovery pump of this solution can be applied to the fuel dispensers at gas stations to provide reliable operation.

[0093] The above description is only part of the embodiments of the present invention and does not limit the scope of protection of the present invention. Any equivalent device or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A coupling, applied to a gas pump oil recovery pump, comprising a drive motor assembly and a negative pressure generating assembly, wherein the drive motor assembly is provided with a drive shaft for outputting driving force, and the negative pressure generating assembly is provided with an input shaft for inputting negative pressure driving power, characterized in that: The coupling is provided between the drive motor assembly and the negative pressure generating assembly, and is connected to the drive shaft of the drive motor assembly and the input shaft of the negative pressure generating assembly respectively. The coupling comprises: The main body is a circular plate-shaped structure, with raised step portions provided on both opposite end faces, and a raised positioning column provided on the middle of the end face of the step portion away from the main body; The end of the drive shaft of the drive motor assembly is provided with a first fitting portion adapted to the profile of the step portion, and the bottom of the first fitting portion is provided with a first positioning hole adapted to the structure of the positioning post. The step portion on one end surface of the main body is inserted into the first fitting portion, and at the same time, the positioning post thereon is inserted into the first positioning hole, thereby constraining one end of the main body to be connected to the drive shaft. The end of the input shaft of the negative pressure generating component is provided with a second fitting portion adapted to the contour of the step portion, and the bottom of the second fitting portion is provided with a second positioning hole adapted to the structure of the positioning column. The step portion on the other end face of the main body is inserted into the second fitting portion. At the same time, the positioning column thereon is inserted into the second positioning hole, constraining the other end of the main body to be connected to the input shaft, so that when the driving shaft of the drive motor assembly rotates, it drives the input shaft to rotate through the main body, so that the negative pressure generating component inputs driving force.

2. The coupling according to claim 1, wherein: The main body of the coupling and the step portion and positioning column thereon are all integrally formed structures, and their hardness is lower than that of the drive shaft and the input shaft.

3. An oil and gas recovery pump comprising a drive motor assembly and a negative pressure generating assembly, wherein the drive motor assembly is provided with a drive shaft for outputting a driving force, and the negative pressure generating assembly has an input shaft for inputting a negative pressure driving force, characterized in that: The invention is applied to the coupling according to claim 1 or 2.

4. The oil and gas recovery pump according to claim 3, characterized in that: The drive motor assembly includes: The first shell is a cylindrical shell structure with an open lower end; The second housing is a cylindrical housing structure with an open upper end. Its upper end is threadedly connected to the lower end of the first housing, and the second housing and the first housing form a mounting cavity. A stop bolt and a first O-ring are threadedly inserted into the threaded connection between the first and second housings. The drive motor is arranged in the installation cavity, and the upper end surface of the main body of the drive motor is provided with a mounting positioning rod, and the interior of the first shell is provided with a mounting positioning hole corresponding to the mounting positioning rod and cooperating with the mounting positioning rod. The rotating shaft of the drive motor is set as a drive shaft, which passes through the first shell upward and is connected to the coupling; the first shell is provided with a first avoidance hole at a position corresponding to the position where the drive shaft of the drive motor passes through, and the first avoidance hole is provided with a shrinkage structure, which is set as an explosion-proof joint surface; A spring is arranged in the installation cavity and is located at the bottom of the drive motor and the second shell. One end of the spring is against the bottom of the drive motor, and the other end of the spring is against the bottom of the second shell.

5. The oil and gas recovery pump according to claim 4, characterized in that: The driving motor is connected to a first cable, which is arranged in the installation cavity. One first cable has multiple first conductors and is connected to an external power supply through a cable assembly.

6. The oil and gas recovery pump according to claim 5, characterized in that: The cable assembly comprises: The second cable is a multi-strand wire structure, one end of which is inserted into the installation cavity. The second cable has multiple second wires corresponding to the first wires one by one. One end of the second cable is connected to the multiple second wires and the first wire of the first cable in a removable one-to-one manner through a wiring assembly. The first connecting sleeve is a rigid tubular structure with external thread structures at both ends, one end of which is threadedly connected to the upper portion of the first shell and communicates with the installation cavity, and the other end of which extends vertically upward; The second connecting sleeve is a flexible connecting tube, one end of which has an internal thread structure and is threadedly connected to the other end of the first connecting sleeve. The other end of the second cable is led out of the installation cavity by passing through the first connecting sleeve and the second connecting sleeve in sequence and is used to connect to an external power supply.

7. The oil vapor recovery pump according to any one of claims 3 to 6, characterized in that: The negative pressure generating component includes: The third shell is a cylindrical structure with both ends open; A rotor mechanism is disposed in the first housing, wherein the rotor mechanism and two sides of a maximum distance portion of an inner wall of the third housing form a first region and a second region that are interconnected; a base fixedly connected to the lower portion of the third shell, wherein the lower portion of the base is also fixedly connected to the upper end surface of the first shell; A connecting base is fixedly connected to the upper portion of the third shell, and a pair of air guide grooves are provided on an end surface of the connecting base close to the third shell, the air guide grooves being arranged opposite to each other and communicating with the first area and the second area in a one-to-one correspondence; A first gasket is provided between the connecting seat and the upper end surface of the first shell and separates the pair of air guide grooves. The first gasket is provided with an avoidance groove adapted to its structure corresponding to the pair of air guide grooves; The connecting joints are a pair and correspond to and are connected to the air guide grooves one by one; an input shaft, one end of which is connected to the rotor mechanism, and the other end of which rotatably passes through the base and is connected to the coupling, so that when the drive shaft of the drive motor assembly rotates, it drives the input shaft to rotate through the main body of the coupling, so that the rotor mechanism of the negative pressure generating assembly inputs a driving force, so that the gas in the first area is pushed to the second area and outputted through the gas guide groove and connecting joint corresponding to the second area, thereby generating negative pressure in the first area, or the gas in the second area is pushed to the first area and outputted through the gas guide groove and connecting joint corresponding to the first area, thereby generating negative pressure in the second area; Among them, the base is correspondingly provided with a through groove for the input shaft to pass through, the upper part of the through groove is provided with an oil seal, and the lower part is provided with at least one bearing, the input shaft is located in the middle of the through groove and is provided with a first retaining spring; the lower part of the input shaft is provided with a second retaining spring.

8. The oil and gas recovery pump according to claim 7, characterized in that: The rotor mechanism comprises: a rotor eccentrically disposed within the third housing, with its lower end surface abutting against an upper end surface of the base or forming a gap less than a preset value, wherein a first region and a second region are interconnected on both sides of a location of maximum spacing between the rotor and an inner wall of the third housing, and a plurality of radially extending slots are provided on a circumferential side of the rotor; The blades are multiple and correspond one to one with the slots on the rotor and slide through the slots; One end of the input shaft is connected to the rotor via a key or a stud, and a mounting hole connected to the input shaft is provided at the center of the rotor. The input shaft rotates to drive the rotor to rotate, causing the blades sliding through the slots on the rotor to rotate, so that the gas in the first area is pushed to the second area and output through the corresponding air guide grooves and connecting joints in the second area, thereby generating negative pressure in the first area, or the gas in the second area is pushed to the first area and output through the corresponding air guide grooves and connecting joints in the first area, thereby generating negative pressure in the second area.

9. The oil and gas recovery pump according to claim 7, characterized in that: The rotor mechanism comprises: a rotor eccentrically disposed within the third housing, with its lower end surface abutting against the upper end surface of the base or forming a gap less than a preset value, wherein a first region and a second region are interconnected on both sides of a location of maximum spacing between the rotor and the inner wall of the third housing, and a plurality of radially extending arcuate movable grooves are provided on a circumferential side of the rotor; The rollers are cylindrical in structure, and are in multiple number and correspond one-to-one with the arc-shaped movable grooves on the rotor and are movably arranged in the arc-shaped movable grooves; One end of the input shaft is connected to the rotor via a key or a stud, and a mounting hole connected to the input shaft is provided at the center of the rotor. The input shaft rotates to drive the rotor to rotate, causing the rollers in the arc-shaped movable grooves on the rotor to rotate accordingly and, under the action of centrifugal force, to adhere to the inner wall of the third housing, so that the gas in the first area is pushed to the second area and output through the corresponding air guide grooves and connecting joints in the second area, thereby generating a negative pressure in the first area, or the gas in the second area is pushed to the first area and output through the corresponding air guide grooves and connecting joints in the first area, thereby generating a negative pressure in the second area.

10. A fuel dispenser, characterized in that: It comprises the oil and gas recovery pump according to any one of claims 3 to 9.

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