Oil gas recovery pump

Abstract

The oil gas recovery pump comprises a vacuum pump and a motor, and the vacuum pump comprises a floral wheel, a pump main shaft and a pump base which are coaxially arranged. According to the oil gas recovery pump, the housing is arranged at the second end of the pump main shaft, the housing and the pump main shaft are of an integral structure, and the housing synchronously rotates along with the pump main shaft. The position of the housing corresponds to the positions of a bearing and an isolation block arranged on a pump main shaft in the prior art, specifically, a bearing assembly is arranged outside the housing and used for circumferentially supporting the housing so as to improve the working stability of the pump main shaft, and meanwhile a coupler is arranged in the housing and used for achieving connection of the second end of the pump main shaft and a motor. According to the scheme, the coupler is arranged in the housing and corresponds to the position of the bearing assembly, compared with the prior art, the length of the pump main shaft is shortened, the overall length of the oil and gas recovery pump is correspondingly shortened, the size of the oil and gas recovery pump is further reduced, and the requirement of the oil and gas recovery pump for the installation space is lowered.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas recovery, and in particular to an oil and gas recovery pump. Background Art

[0002] In the process of refueling a car with a gas pump, a large amount of oil and gas will inevitably evaporate, which will cause environmental pollution, fire hazards, personal safety hazards and waste of resources.

[0003] In the prior art, the volatilized oil and gas are generally recovered by an oil and gas recovery pump, the air inlet end of the oil and gas recovery pump is connected to an oil and gas recovery type refueling gun, and the air outlet end of the oil and gas recovery pump is connected to an oil storage tank through an oil and gas recovery pipe.

[0004] The oil and gas recovery pump includes a vacuum pump and a motor. The pump main shaft of the vacuum pump is connected to the motor. The motor drives the pump main shaft to rotate, and the pump main shaft drives the flower wheel to rotate. Currently, in order to improve the working stability of the pump main shaft, a bearing and an isolation block for separating adjacent bearings are arranged between the pump main shaft and the pump seat. However, this method of improving the working stability of the pump main shaft will increase the length of the pump main shaft, thereby increasing the overall length of the oil and gas recovery pump, resulting in an increase in the oil and gas recovery pump's requirements for installation space.

[0005] Therefore, how to shorten the overall length of the oil and gas recovery pump to reduce the requirements of the oil and gas recovery pump for installation space has become a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0006] The present application provides an oil and gas recovery pump to shorten the overall length of the oil and gas recovery pump and reduce the requirements of the oil and gas recovery pump on the installation space.

[0007] In one embodiment, an oil and gas recovery pump is provided, comprising a vacuum pump and a motor.

[0008] The vacuum pump comprises a flower wheel, a pump main shaft and a pump seat, wherein a first end of the pump main shaft is connected to the flower wheel, and a second end of the pump main shaft is connected to the motor through a coupling.

[0009] The second end of the pump main shaft is provided with a cover shell coaxially arranged with the pump main shaft, the outer wall of the cover shell is connected with the pump seat through a bearing assembly, and the coupling is located in the cover shell.

[0010] Preferably, in the above-mentioned oil and gas recovery pump, the bearing assembly includes a bearing and an isolation block, the isolation block is arranged between two adjacent bearings, the bearing and the isolation block are both sleeved on the outer wall of the cover shell, the inner ring of the bearing is connected to the cover shell, and the outer ring of the bearing is connected to the pump seat.

[0011] Preferably, in the above-mentioned oil and gas recovery pump, the pump main shaft is key-connected to the spline.

[0012] The first end of the pump main shaft is provided with a threaded hole coaxially arranged with the pump main shaft, the flower wheel is provided with a mounting hole, and the pump main shaft and the flower wheel are connected by bolts matched with the threaded hole and the mounting hole.

[0013] Preferably, in the above-mentioned oil and gas recovery pump, the coupling is connected to the pump main shaft by screws.

[0014] Preferably, in the above-mentioned oil and gas recovery pump, the coupling is a plum blossom coupling.

[0015] Preferably, in the above oil and gas recovery pump, sliding vanes are evenly arranged on the circumference of the flower wheel.

[0016] Preferably, in the above oil and gas recovery pump, the sliding vane is a carbon vane.

[0017] Preferably, in the above-mentioned oil and gas recovery pump, the flower wheel is a hollow flower wheel.

[0018] The embodiment of the present application discloses an oil and gas recovery pump, including a vacuum pump and a motor. The vacuum pump includes a coaxially arranged flower wheel, a pump main shaft and a pump seat. The oil and gas recovery pump disclosed in the present application is provided with a cover shell at the second end of the pump main shaft. The cover shell and the pump main shaft are an integral structure, and the cover shell rotates synchronously with the pump main shaft. The position of the cover shell corresponds to the position of the bearing and the isolation block on the pump main shaft in the prior art. Specifically, a bearing assembly is arranged outside the cover shell, and the bearing assembly circumferentially supports the cover shell to improve the working stability of the pump main shaft. At the same time, a coupling is arranged inside the cover shell, and the coupling is used to realize the connection between the second end of the pump main shaft and the motor. This solution arranges the coupling inside the cover shell, and corresponds to the position of the bearing assembly. Compared with the prior art, the length of the pump main shaft is shortened, and the overall length of the oil and gas recovery pump is correspondingly shortened, thereby reducing the volume of the oil and gas recovery pump and reducing the requirements of the oil and gas recovery pump for the installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of an oil and gas recovery pump in one embodiment;

[0020] Figure 2 A front view of a pump main shaft of an oil and gas recovery pump in one embodiment;

[0021] Figure 3 is a cross-sectional view of a pump main shaft of an oil and gas recovery pump in one embodiment;

[0022] Figure 4 A top view of a pump main shaft of an oil and gas recovery pump in one embodiment;

[0023] Figure 5A bottom view of a pump main shaft of an oil and gas recovery pump in one embodiment.

[0024] The reference numerals are as follows:

[0025] 10-vacuum pump, 20-motor, 30-coupling, 40-bearing assembly;

[0026] 100-flower wheel, 200-pump main shaft, 300-pump seat, 400 cover, 500-bearing, 600-isolation block. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0028] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0029] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0030] See also Figure 1-Figure 5 , discloses an oil and gas recovery pump, including a vacuum pump 10 and a motor 20.

[0031] The vacuum pump 10 comprises a flower wheel 100, a pump main shaft 200 and a pump seat 300, and the flower wheel 100, the pump main shaft 200 and the pump seat 300 are coaxially arranged.

[0032] like Figure 1As shown, the length of the pump main shaft 200 along its own axial direction is greater than the length of the flower wheel 100 along its own axial direction, and the length of the pump main shaft 200 along its own axial direction is less than the sum of the lengths of the flower wheel 100 and the pump seat 300 along the axial direction of the flower wheel 100. Compared with the method in the prior art that the pump main shaft passes through the flower wheel and the pump seat, the length of the pump main shaft is shortened.

[0033] The first end of the pump main shaft 200 is connected to the flower wheel 100, and the second end of the pump main shaft 200 is connected to the motor 20 through the coupling 30. Figure 1 and 2 As shown, in this embodiment, a cover 400 is provided at the second end of the pump main shaft 200. The cover 400 is coaxially arranged with the pump main shaft 200. The outer wall of the cover 400 is connected to the pump seat 300 through a bearing assembly 40. A coupling 30 is provided inside the cover 400.

[0034] The oil and gas recovery pump disclosed in the present application is provided with a cover 400 at the second end of the pump main shaft 200. The cover 400 and the pump main shaft 200 form an integral structure, and the cover 400 rotates synchronously with the pump main shaft 200. The position of the cover 400 corresponds to the position of the bearing and the isolation block on the pump main shaft in the prior art. Specifically, a bearing assembly 40 is provided outside the cover 400, and the bearing assembly 40 circumferentially supports the cover 400 to improve the working stability of the pump main shaft 200. At the same time, a coupling 30 is provided inside the cover 400, and the coupling 30 is used to achieve the connection between the second end of the pump main shaft 200 and the motor 20. In this solution, the coupling 30 is provided in the cover 400, and corresponds to the position of the bearing assembly 40. Compared with the prior art, the length of the pump main shaft 200 is shortened, and the overall length of the oil and gas recovery pump is shortened accordingly, thereby reducing the volume of the oil and gas recovery pump and reducing the requirements of the oil and gas recovery pump for the installation space.

[0035] The oil and gas recovery pump of the present application is a split structure, including a vacuum pump 10 and a motor 20. The vacuum pump 10 is connected to the motor 20 via a coupling 30. The coupling 30 has a good ability to supplement coaxiality and can ensure the coaxiality of the split structure oil and gas recovery pump.

[0036] The oil and gas recovery pump in which the vacuum pump 10 and the motor 20 are connected and assembled by a coupling 30 is easy to assemble and disassemble. When the vacuum pump 10 or the motor 20 fails, only the failed vacuum pump 10 or the motor 20 can be repaired, thereby reducing the maintenance cost of the oil and gas recovery pump; at the same time, the noise and temperature rise of the oil and gas recovery pump during operation can be reduced to a certain extent.

[0037] The coupling 30 may be a rigid coupling or a flexible coupling.

[0038] Preferably, the coupling 30 uses a flexible coupling, and the flexible coupling is preferably a plum blossom coupling. The plum blossom coupling has a motor claw plate for connecting to the motor shaft, an elastomer, and a pump head claw plate for connecting to the pump main shaft 200. The motor claw plate and the pump head claw plate are made of 45 steel, and the elastomer is made of engineering plastics or rubber. The elastomer plays a role in buffering and reducing vibration. The motor claw plate, the elastomer and the pump head claw plate can be in the shape of a plum blossom with three petals, four petals, six petals, eight petals or ten petals. The plum blossom coupling has a simple structure, does not require lubrication, is easy to maintain, easy to check, maintenance-free, and is wear-resistant and oil-resistant, and has good shock absorption, buffering and electrical insulation properties; the operating temperature is -35℃~+80℃, which can fully meet the working environment of the oil and gas recovery pump and can operate continuously for a long time.

[0039] The flexible coupling not only connects the vacuum pump 101 and the motor 202, but also has a shock absorbing function.

[0040] In order to install the coupling 30 in the housing 400, the diameter of the housing 400 must be larger than the diameter of the pump main shaft 200. Accordingly, the size of the bearing assembly 40 disposed outside the housing 400 also needs to be appropriately increased, and the size of the pump seat 300 also needs to be increased. In this solution, the circumferential size of the pump seat 300 is close to the circumferential size of the flower wheel 100, and the size of the pump seat 300 is close to that of the motor 200, so that the circumferential size of the oil and gas recovery pump along the axial direction of the pump main shaft 200 is close, which optimizes the appearance of the oil and gas recovery pump. Figure 1 As shown, the circumferential dimensions of the flower wheel 100, the pump base 300 and the motor 20 are approximately equal.

[0041] The two ends of the axial direction of the flower wheel 100 are respectively arranged with the pump cover and the pump seat 300 of the oil and gas recovery pump, the first end of the axial direction of the flower wheel 100 is against the pump cover, and the second end of the axial direction of the flower wheel 100 is against the pump seat 300. An upper wear-resistant sheet is arranged between the flower wheel 100 and the pump cover, and a lower wear-resistant sheet is arranged between the flower wheel 100 and the pump seat 300. The flower wheel 100 is connected to the pump main shaft 200, and the pump main shaft 200 is connected to the motor 20. Specifically, the motor 20 drives the pump main shaft 200 to rotate, and the pump main shaft 200 drives the flower wheel 100 to rotate. In the prior art, the flower wheel 100 is key-connected to the pump main shaft 200. However, when the flower wheel 100 rotates with the pump main shaft 200, the flower wheel 100 moves along the axial direction of the pump main shaft 200, causing wear of the upper wear-resistant plate and the lower wear-resistant plate. In order to solve the above problem, the present application provides a mounting hole at the first end of the flower wheel 100, and a threaded hole corresponding to and connected to the mounting hole is provided on the pump main shaft 200. The flower wheel 100 is connected to the pump main shaft 200 by bolts that cooperate with the mounting hole and the threaded hole to limit the movement of the flower wheel 100 along the axial direction of the pump main shaft 200, thereby reducing the wear of the upper wear-resistant plate and the lower wear-resistant plate when the flower wheel 100 rotates, thereby improving the stability of the oil and gas recovery pump operation and extending the service life of the oil and gas recovery pump.

[0042] In some embodiments of this solution, the coupling 30 is connected to the second end of the pump main shaft 200 by screws. Figure 3 As shown, the second end of the pump main shaft 200 has a threaded hole opened along the axial direction of the pump main shaft 200, and the coupling 30 has a mounting hole corresponding to and connected to the second threaded hole. The coupling 30 and the pump main shaft 200 are connected by screws that cooperate with the mounting hole and the threaded hole.

[0043] The connection between the coupling 30 and the pump main shaft 200 is not limited to screw connection, but may also be keyway type fixation, expansion sleeve fixation, etc.

[0044] The bearing assembly 40 includes a bearing 500 and an isolation block 600. An isolation block 600 is arranged between two adjacent bearings 500. The bearing 500 and the isolation block 600 are both sleeved on the outer wall of the cover 400. The inner ring of the bearing 500 is connected to the cover 400, and the outer ring of the bearing 500 is connected to the pump seat 300.

[0045] like Figure 2 and Figure 3 As shown, the outer wall of the cover 400 and the inner wall of the pump seat 300 are both provided with limiting grooves that cooperate with the bearing assembly 40. The bearing assembly 40 is assembled in the limiting groove. The limiting groove is used to axially limit the bearing assembly 40. The end of the limiting groove away from the flower wheel 100 is provided with a baffle for limiting the bearing assembly 40.

[0046] In some embodiments of the present application, the bearing assembly 40 includes two bearings 500 and an isolation block 600 , and the isolation block 600 is located between the two bearings 500 .

[0047] The isolation block 600 can adjust the gap between adjacent bearings 500 to control friction and reduce the noise of the bearing 500 movement. At the same time, it can limit the axial and radial movement range of the roller to improve the accuracy and reliability of the bearing 500, solve the elastic deformation caused by load changes, and divert axial force and radial force to reduce the difference in force on the inner ring and outer ring, thereby improving the load-bearing capacity and service life of the bearing 500.

[0048] The oil and gas recovery pump disclosed in the present application adopts a double connection structure in which a bearing assembly 40 is arranged on the outer wall of a housing 400 and a coupling 30 is arranged inside, thereby solving the problems of power connection, shaft stability and shaft length control.

[0049] The bearing assembly 40 supports and limits the circumference of the housing 400 , which not only improves the dynamic balance of the pump main shaft 200 when rotating at high speed, but also limits the axial position of the pump main shaft 200 to reduce the axial movement of the flower wheel 100 .

[0050] Slides are evenly arranged on the circumference of the flower wheel 100. The flower wheel 100 is provided with mounting grooves for mounting the slides, which are opened from a position close to the center of the flower wheel 100 to the outer wall of the flower wheel 100, and are arranged in a radial direction away from the flower wheel 100. The notches of the mounting grooves are located on the outer circumference of the flower wheel 100, and a plurality of mounting grooves are evenly distributed on the circumference of the flower wheel 100.

[0051] The sliding vane of the flower wheel 100 is a self-lubricating carbon sheet. The self-lubricating carbon sheet has good wear resistance and is environmentally friendly and pollution-free. The sliding vane is made of wear-resistant material, and the flower wheel 100 does not contact the pump body, the end cover and the pump seat 300, which greatly prolongs the service life of the vacuum pump 10 and effectively reduces the cost of secondary oil and gas recovery at gas stations.

[0052] Wear-resistant sliding vanes are preferred to extend the service life of the sliding vanes and effectively reduce the cost of secondary oil and gas recovery at gas stations.

[0053] When the flower wheel 100 rotates, the slide is tightly attached to the cavity wall of the pump body under the action of centrifugal force, and multiple spaces are formed between the flower wheel 100, the slide, the pump cover, the cavity wall of the pump body and the pump seat 300. The multiple spaces gradually increase or decrease along the circumference of the flower wheel 100. The space formed from the air inlet position gradually increases, reaches the maximum when approaching the air outlet, and is the smallest at the end of the air outlet position. When the flower wheel 100 rotates one circle, the space formed increases from small to large, and then decreases from large to small, and the vacuum pump 10 completes a cycle of air intake. The oil and gas recovery pump has good vacuum degree and good operation stability during operation.

[0054] In some embodiments of the present application, the number of sliding sheets is five, and the number of spaces formed is six.

[0055] The weight of the flower wheel 100 affects the torque and power of the vacuum pump 10. The heavier the flower wheel 100 is, the more power the motor 20 needs to output, resulting in increased energy consumption of the oil and gas recovery pump. In order to reduce the energy consumption of the oil and gas recovery pump, the present application sets a weight-reducing hole in the flower wheel 100 to form a hollow flower wheel, reduce the weight of the flower wheel 100, and reduce the weight of the flower wheel 100 under the same volume, thereby reducing the power required to output by the motor 20 and reducing the energy consumption of the oil and gas recovery pump.

[0056] The specific method of opening the weight-reducing holes is selected by technicians in this field according to actual needs and is not specifically limited here.

[0057] The above specific examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. For those skilled in the art of the present invention, some simple deductions, deformations or substitutions can be made based on the idea of ​​the present invention.

Claims

1. An oil and gas recovery pump, characterized in that: It comprises a vacuum pump (10) and a motor (20), The vacuum pump (10) comprises a flower wheel (100), a pump main shaft (200) and a pump seat (300), wherein a first end of the pump main shaft (200) is connected to the flower wheel (100), and a second end of the pump main shaft (200) is connected to the motor (20) via a coupling (30). The second end of the pump main shaft (200) is provided with a cover shell (400) coaxially arranged with the pump main shaft (200); the outer wall of the cover shell (400) is connected to the pump seat (300) via a bearing assembly (40); and the coupling (30) is located inside the cover shell (400).

2. The oil and gas recovery pump according to claim 1, characterized in that: The bearing assembly (40) comprises a bearing (500) and an isolation block (600), wherein the isolation block (600) is arranged between two adjacent bearings (500), and the bearing (500) and the isolation block (600) are both sleeved on the outer wall of the housing (400), the inner ring of the bearing (500) is connected to the housing (400), and the outer ring of the bearing (500) is connected to the pump seat (300).

3. The oil and gas recovery pump according to claim 1, characterized in that: The pump main shaft (200) is key-connected to the flower wheel (100). The first end of the pump main shaft (200) is provided with a threaded hole coaxially arranged with the pump main shaft (200), the flower wheel (100) is provided with a mounting hole, and the pump main shaft (200) and the flower wheel (100) are connected by bolts matching the threaded hole and the mounting hole.

4. The oil and gas recovery pump according to claim 1, characterized in that: The coupling (30) is connected to the pump main shaft (200) via screws.

5. The oil and gas recovery pump according to claim 1, characterized in that: The coupling (30) is a plum blossom coupling.

6. The oil and gas recovery pump according to claim 1, characterized in that: Slide plates are evenly arranged on the circumference of the flower wheel (100).

7. The oil and gas recovery pump according to claim 6, characterized in that: The sliding sheet is a carbon sheet.

8. The oil and gas recovery pump according to claim 1, characterized in that: The flower wheel (100) is a hollow flower wheel.

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