Compressor and tertiary oil gas recovery system

Abstract

The utility model discloses a compressor and a tertiary oil gas recovery system, the compressor is applied to the oil gas recovery system, and the compressor comprises a shell, a driving motor and a piston; the shell comprises an outer shell part and an inner shell part, a containing cavity is formed in the inner shell part, the piston is installed in the containing cavity in a sealed and sliding mode and divides the containing cavity into an installation cavity and a compression cavity, the compression cavity is used for compressing oil gas, and a cooling cavity is formed between the outer shell part and the inner shell part. The shell is provided with a cooling medium inlet and a cooling medium outlet which are communicated with the cooling cavity; the driving motor is installed in the containing cavity and connected with the piston so as to drive the piston to do reciprocating rectilinear motion in the containing cavity. According to the compressor and the tertiary oil gas recovery system, the temperature in the compressor can be reduced, and therefore the recovery rate and the compression effect of the tertiary oil gas recovery system are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas recovery systems, and particularly relates to a compressor and a three - stage oil and gas recovery system. Background Art

[0002] During the oil unloading and fuel dispensing processes of the gas station storage and transportation system, a large amount of gasoline vapor is generated along with the volatilization of gasoline itself and the operation of the secondary oil and gas recovery system. At the same time, due to the tightness of the storage and transportation system, the pressure in the oil tank will continuously increase. When it reaches 2 kPa, the traditional PV valve will open under the action of pressure, directly discharging the saturated gasoline vapor in the oil tank into the air, which not only causes great harm to the environment but also results in a huge waste of resources. Therefore, the existing solution is to add a three - stage oil and gas recovery system to reduce the above - mentioned harm and achieve the recovery of oil and gas.

[0003] The three - stage oil and gas recovery system mainly works based on the principles of compression condensation and membrane separation. However, the equipment of the three - stage oil and gas recovery system is mainly installed outdoors. In summer, the temperature is relatively high, and the temperature inside the equipment can reach above 50 °C. Too high a temperature will cause: poor compression condensation effect, thus affecting the liquefaction effect; the oil and gas molecules are active after membrane separation, and the emission concentration is too high, which may result in non - compliant emissions.

[0004] The information disclosed in this background art section is only intended to enhance the overall understanding of the present utility model and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a compressor and a three - stage oil and gas recovery system, which can reduce the temperature inside the compressor, thereby improving the recovery rate and compression effect of the three - stage oil and gas recovery system.

[0006] To achieve the above - mentioned purpose, the technical solution provided by a specific embodiment of the present utility model is as follows: A compressor is applied to an oil and gas recovery system. The compressor includes a housing, a driving motor, and a piston. The housing includes an outer housing part and an inner housing part. An accommodation cavity is formed inside the inner housing part. The piston is slidably installed in the accommodation cavity in a sealed manner and divides the accommodation cavity into an installation cavity and a compression cavity. The compression cavity is used for compressing oil and gas. A cooling cavity is provided between the outer housing part and the inner housing part. A cooling medium inlet and a cooling medium outlet communicating with the cooling cavity are provided on the housing. The driving motor is installed in the accommodation cavity and is connected to the piston to drive the piston to perform reciprocating linear motion in the accommodation cavity.

[0007] In one or more embodiments of the present utility model, the housing includes a motor housing, a connection housing connected to the motor housing, and a cylinder housing connected to the connection housing. The motor housing, the connection housing, and the cylinder housing each include the outer housing portion and the inner housing portion.

[0008] In one or more embodiments of the present utility model, the cooling chamber includes a first chamber formed on the motor housing, a second chamber formed on the connection housing, and a third chamber formed on the cylinder housing. The first chamber is communicated with the second chamber through a first pipeline provided outside the housing, and the second chamber is communicated with the third chamber through a second pipeline provided outside the housing.

[0009] In one or more embodiments of the present utility model, the connection part of the first pipeline and the second chamber is provided at the top of the connection housing or near the top of the connection housing; the connection part of the second pipeline and the second chamber is provided at the top of the connection housing or near the top of the connection housing.

[0010] In one or more embodiments of the present utility model, the cylinder housings are provided on opposite sides of the connection housing, and a piston is slidably connected in each cylinder housing.

[0011] In one or more embodiments of the present utility model, one of the cooling medium inlet and the cooling medium outlet is provided on the motor housing, and the other is provided on the cylinder housing;

[0012] The cooling medium inlets on the cylinder housing are communicated with each other through a third pipeline, and a liquid inlet is provided on the third pipeline; or, the cooling medium outlets on the cylinder housing are communicated with each other through a third pipeline, and a liquid outlet is provided on the third pipeline.

[0013] In one or more embodiments of the present utility model, the cooling medium inlet or the cooling medium outlet on the cylinder housing is provided at one end in the length direction of the cylinder housing, and the connection part of the second pipeline and the cylinder housing is provided on the side wall in the length direction of the cylinder housing.

[0014] In one or more embodiments of the present utility model, a connecting member is provided on the connection housing, and the connecting member is connected to the third pipeline.

[0015] In one or more embodiments of the present utility model, the driving motor is communicated with the piston through a transmission assembly. The transmission assembly includes an eccentric bearing and a transmission member sleeved outside the eccentric bearing. The eccentric bearing is sleeved on the output shaft of the driving motor, and the transmission member is movably connected to the piston; and / or,

[0016] The accommodation chamber further includes a feed chamber and a discharge chamber. The feed chamber is communicated with the oil and gas inlet, the feed chamber is communicated with the compression chamber, and a valve is provided at the connection between the feed chamber and the compression chamber to control the communication and disconnection between the feed chamber and the compression chamber; the discharge chamber is communicated with the oil and gas outlet, the discharge chamber is communicated with the compression chamber, and a valve is provided at the connection between the discharge chamber and the compression chamber to control the communication and disconnection between the discharge chamber and the compression chamber.

[0017] The present utility model also provides a three - stage oil and gas recovery system, including the compressor as described above.

[0018] Compared with the prior art, for the compressor and the three - stage oil and gas recovery system of the present utility model, by adding a cooling chamber between the outer shell and the inner shell of the housing and injecting a cooling medium into the cooling chamber when the compressor is working, it can not only cool the heat generated by the compressor itself, but also isolate the heat transfer from the environment to the inside of the compressor as much as possible. From two aspects, it can reduce the temperature inside the compressor, ensure the working efficiency of the compressor, and improve the oil and gas recovery efficiency of the three - stage oil and gas recovery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the compressor in an embodiment of the present utility model;

[0021] Figure 2 Schematic diagram of the compressor in an embodiment of the present utility model;

[0022] Figure 3 Rear view of the compressor in an embodiment of the present utility model;

[0023] Figure 4 For Figure 3 Cross - sectional view at BB in

[0024] Figure 5 For Figure 3 Partial cross - sectional view at AA in

[0025] Main reference numeral description:

[0026] 1. Housing; 11. Motor housing; 12. Connecting housing; 13. Cylinder housing; 14. Cooling medium inlet; 15. Cooling medium outlet; 16. Outer housing part; 17. Inner housing part; 18. Accommodation cavity; 181. Installation cavity; 182. Compression cavity; 183. Feeding cavity; 184. Discharging cavity; 185. Oil-gas inlet; 186. Oil-gas outlet; 19. Cooling cavity; 191. First chamber; 192. Second chamber; 193. Third chamber; 2. Driving motor; 21. Output shaft; 3. Piston; 4. Transmission assembly; 41. Eccentric bearing; 42. Transmission part; 5. First pipeline; 6. Second pipeline; 7. Third pipeline; 71. Liquid outlet; 8. Connecting piece. Detailed implementation manners

[0027] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] As described in the background art, during the oil unloading and fuel dispensing processes of the gas station storage and transportation system, a large amount of gasoline volatile gas will be generated along with the volatilization of gasoline itself and the operation of the secondary oil-gas recovery system. At the same time, due to the airtightness of the storage and transportation system, the pressure in the oil tank will continuously increase. When it reaches 2 kPa, the traditional PV valve will open under the action of the pressure, directly discharging the saturated gasoline volatile gas in the oil tank into the air, which not only causes great harm to the environment but also results in a great waste of resources. That is, the tertiary oil-gas recovery system is mainly for recovering the oil-gas directly discharged into the air in the oil tank after the secondary oil-gas recovery system; therefore, the tertiary oil-gas recovery system is generally directly placed in the external environment (such as outdoor air), and the working efficiency of compressors and the like in the tertiary oil-gas recovery system is greatly affected by the external temperature.

[0029] Combined with Figures 1 to 5 As shown, a compressor in an embodiment of the present utility model is applied to an oil-gas recovery system. The compressor includes a housing 1, a driving motor 2, and a piston 3; the housing 1 includes an outer housing part 16 and an inner housing part 17. An accommodation cavity 18 is provided inside the inner housing part 17. The piston 3 is slidably installed in the accommodation cavity 18 in a sealed manner and divides the accommodation cavity 18 into an installation cavity 181 and a compression cavity 182. The compression cavity 182 is used for compressing oil-gas.

[0030] A cooling chamber 19 is provided between the outer housing portion 16 and the inner housing portion 17. A cooling medium inlet 14 and a cooling medium outlet 15 communicating with the cooling chamber 19 are provided on the housing 1. The drive motor 2 is installed in the accommodation chamber 18 and connected to the piston 3 to drive the piston 3 to perform reciprocating linear motion in the accommodation chamber 18.

[0031] It should be noted that the compressor of the present utility model is mainly applied to the three - stage oil and gas recovery system. Of course, it can also be applied to other systems or devices. For the convenience of the compressor of the present utility model, the compressor in this embodiment is applied to the oil and gas recovery system.

[0032] It can be understood that the compressor of the present utility model realizes the effect of cooling the heat generated by the compressor itself by providing a cooling chamber 19 between the outer housing portion 16 and the inner housing portion 17 of each component of the housing 1 and injecting a cooling medium into the cooling chamber 19 when the compressor is working. In addition, the cooling chamber 19 can be considered to surround and cover the outside of the accommodation chamber 18 (the meaning of covering can be understood as complete covering or partial covering. In this embodiment, it is partial covering), and is not communicated with the accommodation chamber 18. Therefore, the cooling medium in the cooling chamber 19 can also isolate the heat transfer from the environment to the inside of the compressor as much as possible, playing a role in reducing the temperature inside the compressor from two aspects, ensuring the working efficiency of the compressor, and improving the oil and gas recovery efficiency of the three - stage oil and gas recovery system.

[0033] Specifically, the installation chamber 181 and the compression chamber 182 are also not communicated. The housing 1 is also provided with an oil and gas inlet 185 and an oil and gas outlet 186 communicating with the compression chamber 182. The oil and gas enters the compression chamber 182 through the oil and gas inlet 185, and after being compressed in the compression chamber 182, it flows out through the oil and gas outlet 186.

[0034] The cooling medium can be liquid or gas. Preferably, the cooling medium is liquid because the specific heat capacity of liquid is usually greater than that of gas. To reduce the cost of the cooling medium and meet the requirements of green and sustainable development, the cooling medium can be water (or other liquids). The temperature of the cooling medium is lower than the ambient temperature. For example, the temperature of the cooling medium can be between 0 and 25 °C, and the temperature of the cooling medium can also be adjusted according to actual needs.

[0035] Specifically, the accommodation chamber 18 further includes a feed chamber 183 and a discharge chamber 184. The feed chamber 183 is communicated with the oil and gas inlet 185. At the same time, the feed chamber 183 is controllably communicated with the compression chamber 182, that is, a valve is provided at the connection between the feed chamber 183 and the compression chamber 182 to control the communication and cut-off between the feed chamber 183 and the compression chamber 182; the discharge chamber 184 is communicated with the oil and gas outlet 186. At the same time, the discharge chamber 184 is controllably communicated with the compression chamber 182, that is, a valve is provided at the connection between the discharge chamber 184 and the compression chamber 182 to control the communication and cut-off between the discharge chamber 184 and the compression chamber 182.

[0036] The oil and gas can enter the feed chamber 183 from the oil and gas inlet 185. When the valve between the feed chamber 183 and the compression chamber 182 is opened, the oil and gas enters the compression chamber 182 from the feed chamber 183. When the valve between the feed chamber 183 and the compression chamber 182 is closed, after the oil and gas in the compression chamber 182 is compressed by the piston 3, the valve between the discharge chamber 184 and the compression chamber 182 is opened. Under the action of the pressure difference between the gas in the discharge chamber 184 and the compression chamber 182, the compressed oil and gas enters the discharge chamber 184 from the compression chamber 182, and then flows out of the compressor through the oil and gas outlet 186. Then the valve between the discharge chamber 184 and the compression chamber 182 is closed, that is, a process of oil and gas compression is completed.

[0037] Preferably, valves can also be provided at the oil and gas inlet 185 and the oil and gas outlet 186. The valves between the discharge chamber 184 and the compression chamber 182 and between the discharge chamber 184 and the compression chamber 182 can both be one-way valves, such as one-way valve plates, etc.

[0038] In this embodiment, the housing 1 includes a motor housing 11, a connection housing 12 connected to the motor housing 11, and a cylinder housing 13 connected to the connection housing 12. The motor housing 11, the connection housing 12, and the cylinder housing 13 each include an outer housing portion 16 and an inner housing portion 17. The motor housing 11, the connection housing 12, and the cylinder housing 13 can be connected together by bolts and other components, which is convenient for disassembling and assembling the housing 1, so as to facilitate the installation of other components of the compressor in the accommodation chamber 18, such as the piston 3, the driving motor 2, etc. The motor housing 11, the connection housing 12, and the cylinder housing 13 each include an outer housing portion 16 and an inner housing portion 17 in order to make the cooling chamber 19 cover the accommodation chamber 18 as much as possible, achieving a good cooling effect.

[0039] It can be understood that the compression chamber 182 can be located within the cylinder housing 13, and the piston 3 is slidably disposed within the cylinder housing 13. The driving motor 2 drives the piston 3 to slide within the accommodation chamber 18 through the transmission assembly 4, thereby changing the volume of the compression chamber 182, increasing the air pressure within the compression chamber 182, and serving to compress the oil and gas. The compressed oil and gas can flow out through the oil and gas outlet 186 and enter the next device of the three-stage oil and gas recovery system for subsequent processing steps.

[0040] Specifically, the cooling chamber 19 includes a first chamber 191 formed on the motor housing 11, a second chamber 192 formed on the connection housing 12, and a third chamber 193 formed on the cylinder housing 13. The first chamber 191 and the second chamber 192 are connected and communicated through a first pipeline 5 disposed outside the housing 1, and the second chamber 192 and the third chamber 193 are connected and communicated through a second pipeline 6 disposed outside the housing 1. The first chamber 191 can be considered as the chamber formed between the outer housing portion 16 and the inner housing portion 17 of the motor housing 11; the second chamber 192 can be considered as the chamber formed between the outer housing portion 16 and the inner housing portion 17 of the connection housing 12; the third chamber 193 can be considered as the chamber formed between the outer housing portion 16 and the inner housing portion 17 of the cylinder housing 13.

[0041] It can be understood that since the housing 1 includes the motor housing 11, the connection housing 12, and the cylinder housing 13, the first chamber 191, the second chamber 192, and the third chamber 193 are all separate chambers and are all used to accommodate the cooling medium; in order to achieve the flow of the cooling medium between the three chambers, they can be interconnected through the first pipeline 5 and the second pipeline 6. Taking the cooling medium inlet 14 being disposed on the motor housing 11 and connected to the first chamber 191 as an example, the cooling medium enters the first chamber 191 from the cooling medium inlet 14, flows into the second chamber 192 through the first pipeline 5, then flows into the third chamber 193 through the second pipeline 6, and finally flows out through the cooling medium outlet 15.

[0042] Preferably, in order to enhance the cooling effect, the cooling medium can continuously or circulate within the cooling chamber 19 and the pipeline. Among them, the cooling medium inlet 14 and the cooling medium outlet 15 on the compressor can be connected to a circulation pump through a circulation pipeline, and a cooling mechanism can be connected to the circulation pipeline, so that the cooling medium is in a circulating state and at a specific temperature. The circulation pump and the cooling mechanism can be part of the three-stage oil and gas recovery system.

[0043] Furthermore, the connection between the first pipe 5 and the second chamber 192 is provided at the top of the connection housing 12 or adjacent to the top of the connection housing 12; the connection between the second pipe 6 and the second chamber 192 is provided at the top of the connection housing 12 or adjacent to the top of the connection housing 12. Such an arrangement is to allow the cooling medium to flow fully within the second chamber 192, minimizing the temperature difference of the cooling medium at various locations within the second chamber 192 and enhancing the cooling effect.

[0044] At least a part of the second chamber 192 can be located at or adjacent to the connection between the cylinder housing 13 and the connection housing 12, which can better play the role of cooling and temperature reduction.

[0045] Such as Figures 1 to 4 As shown, in this embodiment, the number of cylinder housings 13 is two, and the two cylinder housings 13 are provided on opposite sides of the connection housing 12. The number of pistons 3 is two, and each cylinder housing 13 is slidably connected with a piston 3. Since the heat generated by the compressor is mainly the heat generated by the driving motor 2 and the piston 3 during the compression of oil and gas. Because the connection housing 12 generates less heat, the two cylinder housings 13 are provided on opposite sides of the connection housing 12 to increase the heat dissipation space and also improve the compression efficiency.

[0046] Furthermore, one of the cooling medium inlet 14 and the cooling medium outlet 15 is located on the motor housing 11, and the other is located on the cylinder housing 13; in this embodiment, the cooling medium outlets 15 on the two cylinder housings 13 are connected by a third pipe 7, and the third pipe 7 has a liquid outlet 71. Such an arrangement serves to uniformly recover the cooling medium.

[0047] In other embodiments, the cooling medium inlets 14 on the two cylinder housings 13 are connected by a third pipe 7, and the third pipe 7 has a liquid inlet.

[0048] Preferably, the cooling medium inlet 14 or the cooling medium outlet 15 on the cylinder housing 13 is provided at one end in the length direction of the cylinder housing 13, and the connection between the second pipe 6 and the cylinder housing 13 is provided on the side wall in the length direction of the cylinder housing 13. Such an arrangement is to allow the cooling medium to flow fully within the second chamber 192, minimizing the temperature difference of the cooling medium at various locations within the second chamber 192 and enhancing the cooling effect.

[0049] For ease of installation, the first pipe 5, the second pipe 6, and the third pipe 7 can all be flexible pipes, such as plastic pipes, rubber pipes, etc. Since the distance between one end in the length direction of the two cylinder housings 13 is relatively long, resulting in a relatively long length of the third pipe 7, a connecting member 8 is provided on the connection housing 12, and the connecting member 8 is connected to the third pipe 7. The connecting member 8 can play the role of connecting and restricting the position of the third pipe 7.

[0050] Such as Figure 4As shown, the drive motor 2 is connected to the piston 3 through the transmission assembly 4. The transmission assembly 4 includes an eccentric bearing 41 and a transmission member 42 sleeved outside the eccentric bearing 41. The eccentric bearing 41 is sleeved on the output shaft 21 of the drive motor 2, and the transmission member 42 is movably connected to the piston 3. That is, the output shaft 21 of the drive motor 2 drives the eccentric bearing 41 to rotate, thereby driving the transmission member 42 to move, and the transmission member 42 drives the piston 3 to move, achieving the effect of compressing the oil and gas in the compression chamber 182. The cooperation between the eccentric bearing 41 and the transmission member 42 can convert the rotational force of the output shaft 21 of the drive motor 2 into the force for driving the piston 3 to perform linear motion. Among them, the transmission assembly 4 is installed in the installation cavity 181.

[0051] In other embodiments, the transmission assembly 4 can also be a crankshaft connecting rod. The two ends of the crankshaft connecting rod are respectively connected to the output shaft 21 of the drive motor 2 and the piston 3, and play the role of converting the rotational force of the output shaft 21 of the drive motor 2 into the force for driving the piston 3 to perform linear motion.

[0052] The present utility model also provides a three - stage oil and gas recovery system, including the compressor as described above.

[0053] In summary, for the compressor and the three - stage oil and gas recovery system of the present utility model, by adding a cooling cavity 19 between the outer shell part 16 and the inner shell of the housing 1 and injecting a cooling medium into the cooling cavity 19 when the compressor is working, the compressor can be effectively cooled, increasing the efficiency of the compressor during operation and reducing the possible losses caused by heat. And the design of the compressor meets the explosion - proof design of GB3836 and can be used in areas with explosion - proof requirements such as gas stations.

[0054] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above - mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non - restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0055] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A compressor, applied to an oil and gas recovery system, characterized in that: The compressor comprises a housing, a driving motor and a piston; The housing comprises an outer shell and an inner shell, wherein the inner shell has a receiving chamber, wherein the piston is sealingly and slidably mounted in the receiving chamber, and the receiving chamber is divided into a mounting chamber and a compression chamber, wherein the compression chamber is used to compress oil and gas, and a cooling chamber is arranged between the outer shell and the inner shell, and a cooling medium inlet and a cooling medium outlet communicating with the cooling chamber are arranged on the housing; The driving motor is installed in the accommodating chamber and connected to the piston to drive the piston to perform reciprocating linear motion in the accommodating chamber.

2. The compressor according to claim 1, characterized in that The housing comprises a motor housing, a connecting housing connected to the motor housing, and a cylinder housing connected to the connecting housing. The motor housing, the connecting housing and the cylinder housing respectively comprise the outer housing portion and the inner housing portion.

3. The compressor according to claim 2, characterized in that The cooling chamber includes a first chamber formed on the motor housing, a second chamber formed on the connecting housing, and a third chamber formed on the cylinder housing. The first chamber is connected to the second chamber through a first pipe arranged outside the housing, and the second chamber is connected to the third chamber through a second pipe arranged outside the housing.

4. The compressor according to claim 3, characterized in that The connection between the first pipe and the second chamber is arranged at the top of the connection shell or adjacent to the top of the connection shell; the connection between the second pipe and the second chamber is arranged at the top of the connection shell or adjacent to the top of the connection shell.

5. The compressor according to claim 2, characterized in that The cylinder shells are arranged on two opposite sides of the connecting shell, and each of the cylinder shells is slidably connected with a piston.

6. The compressor according to claim 2, characterized in that One of the cooling medium inlet and the cooling medium outlet is arranged on the motor housing, and the other is arranged on the cylinder housing; A third pipeline is connected between the cooling medium inlets on the cylinder shell, and the third pipeline has a liquid inlet; or a third pipeline is connected between the cooling medium outlets on the cylinder shell, and the third pipeline has a liquid outlet.

7. The compressor according to claim 3, characterized in that The cooling medium inlet or cooling medium outlet on the cylinder shell is arranged at one end of the cylinder shell in the length direction, and the connection between the second pipeline and the cylinder shell is arranged on the side wall of the cylinder shell in the length direction.

8. The compressor according to claim 5, characterized in that The connecting shell is provided with a connecting piece, and the connecting piece is connected to the third pipeline.

9. The compressor according to claim 1, characterized in that The driving motor is connected to the piston through a transmission assembly, the transmission assembly includes an eccentric bearing and a transmission member sleeved outside the eccentric bearing, the eccentric bearing is sleeved on the output shaft of the driving motor, and the transmission member is movably connected to the piston; and / or, The accommodating chamber also includes a feed chamber and a discharge chamber, the feed chamber is connected to the oil and gas inlet, the feed chamber is connected to the compression chamber, and a valve is provided at the connection between the feed chamber and the compression chamber to control the connection and isolation between the feed chamber and the compression chamber; the discharge chamber is connected to the oil and gas outlet, the discharge chamber is connected to the compression chamber, and a valve is provided at the connection between the discharge chamber and the compression chamber to control the connection and isolation between the discharge chamber and the compression chamber.

10. A tertiary oil and gas recovery system, characterized in that: Comprising the compressor according to any one of claims 1 to 9.

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