Compressor device

By adopting the design of parallel cooler and separation components in the compressor device and combining the modular installation method, the efficiency reduction problem caused by the increase in gas temperature in the existing compressor is solved, and more efficient gas compression and a more convenient installation process are achieved.

CN119825682APending Publication Date: 2025-04-15NANJING TECH UNIV +1
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Patent Information

Application Number
CN202510119908.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-25
Publication Date
2025-04-15

AI Technical Summary

Technical Problem

During the pressurization process, the gas temperature rises, resulting in a decrease in compression efficiency, and the structure is complex, noise is high, and installation processes are numerous, which increases the labor intensity of workers and is difficult to effectively reduce the intake temperature of the gas.

Method used

A compressor device is designed, and the gas to be processed is cooled in parallel by means of the first cooler and the second cooler, and the gas is separated by the separation assembly, and the compressed gas is re-cooled by the second cooling unit to reduce a large amount of heat generated during the compression process. At the same time, a modular design is adopted to disassemble the motor, compressor, cooling unit and separation unit on the underframe to simplify the installation process.

Benefits of technology

It effectively reduces the intake temperature of the gas, improves compression efficiency, reduces power consumption, and has a compact structure, convenient assembly, low operating noise, reducing workers' labor intensity.

✦ Generated by Eureka AI based on patent content.

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Abstract

The embodiment relates to the technical field of compressors, and discloses a compressor device which comprises a bottom frame, a compression assembly, a cooling assembly and a separation assembly, the compression assembly comprises a motor installed on a first surface and at least one compressor, all the compressors are sequentially connected in series, and the motor is connected with one compressor; the cooling assembly comprises a first cooling unit and a second cooling unit which are installed on the first surface, the first cooling unit comprises a first cooler and a second cooler, and the first cooler is located above the second cooler and connected with the second cooler in parallel through a connecting pipeline; the separation assembly comprises a first separation unit and a second separation unit which are installed on the first surface, the first separation unit is connected between the first cooling unit and the compressor in series, and the second separation unit is connected between the compressor and the second cooling unit in series. According to the compressor device, the air inlet temperature of air before the air enters the compressor can be quickly reduced, and the compression efficiency can be effectively improved.
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Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a compressor device. Background Art

[0002] In chemical production, compressors (such as centrifugal compressors or reciprocating compressors) are often needed to transport gas from one device to another, or to increase the gas to a higher pressure. However, during the pressurization process of the compressor, the temperature of the gas will increase, which will lead to a decrease in compression efficiency. Therefore, lowering the intake temperature of the gas is one of the effective means to improve the compression efficiency. However, the current compressor structure is often more complicated, the working noise is loud, and the installation process is complicated, which increases the labor intensity of the workers, and the effect of lowering the intake temperature of the gas is poor, resulting in a decrease in compression efficiency. Summary of the invention

[0003] The object of the present invention is to provide a compressor device which can effectively reduce the intake temperature of the gas, improve the compression efficiency, and has the advantages of compact structure, convenient assembly and low operating noise.

[0004] The present application provides a compressor device, comprising:

[0005] a chassis having a first surface and a second surface opposing each other in a first direction;

[0006] A compression assembly, comprising a motor mounted on the first surface and at least one compressor, all of the compressors are connected in series, and the motor is connected to one of the compressors to provide the power required to drive the compressor to operate;

[0007] A cooling assembly, comprising a first cooling unit and a second cooling unit mounted on a first surface, wherein the first cooling unit is used to cool the gas before entering the compressor, and the second cooling unit is used to cool the gas after the compression process; wherein the first cooling unit comprises a first cooler and a second cooler, the first cooler is located above the second cooler and is connected in parallel with the second cooler through a connecting pipe, and the air inlet end of the first cooler is connected to a docking pipe;

[0008] A separation assembly includes a first separation unit and a second separation unit installed on a first surface, wherein the first separation unit is connected in series between the first cooling unit and the compressor for separating the gas before entering the compressor, and the second separation unit is connected in series between the compressor and the second cooling unit for separating the gas after compression processing.

[0009] In one embodiment, the second cooling unit includes a third cooler and a fourth cooler, the third cooler is connected in series with the fourth cooler via a first pipeline, and an air inlet end of the third cooler is connected to the second separation unit.

[0010] In one embodiment, the first separation unit includes a first separator, the first separator is connected to the connecting pipe through a second pipe, and the gas outlet end of the first separator is connected to the gas inlet end of the compressor through a third pipe, and the third pipe is provided with a first vent valve, and the first separator is used to separate the gas before entering the compressor;

[0011] The second separation unit includes a second separator and a third separator, the second separator is connected in series between the compressor and the third cooler, the air inlet end of the third separator is connected to the air outlet end of the fourth cooler through a fourth pipe, and the air outlet end of the third separator is connected to a fifth pipe for connecting to an external device so as to pass the treated gas to the external device.

[0012] In one embodiment, a filter and a first check valve are provided on the second pipeline, and the filter is used to filter the gas leading to the first separator.

[0013] In one embodiment, a second check valve is connected to an end of the fifth pipeline away from the third separator, and a second vent valve is also connected to the third pipeline.

[0014] In one embodiment, the cooling assembly further includes a cooling fan, which is connected to the fourth cooler and is used to cool the cooling medium in the fourth cooler.

[0015] In one embodiment, it further comprises a crankcase, wherein a crankshaft is disposed in the crankcase;

[0016] The compressor includes a first compressor and a second compressor, the first compressor is connected to the second compressor, the motor is connected to the second compressor through the crankshaft, and the intake end of the first compressor is connected to the first separation unit, and the outlet end of the second compressor is connected to the second separation unit.

[0017] In one embodiment, a power pump is further included. The power pump is installed on the first surface and located below the second compressor, and is used to pump external lubricating oil into the second compressor for lubrication.

[0018] In one embodiment, it also includes a first vent pipe and a third vent valve, one end of the first vent pipe is connected to the first compressor, and the third vent valve is arranged on the first vent pipe to control the opening or closing of the first vent pipe.

[0019] In one embodiment, it also includes a second vent pipe and a fourth vent valve, one end of the second vent pipe is connected to the second compressor, and the other end is connected to the fourth cooler, and the fourth control valve is arranged on the second vent pipe to control the conduction or closing of the second vent pipe.

[0020] Compared with the prior art, the above technical solution provided by the embodiment of the present application has the following beneficial effects:

[0021] The compressor cools the gas to be processed by connecting the first cooler and the second cooler in parallel, so as to quickly reduce the intake temperature of the gas before it enters the compressor, which can effectively improve the compression efficiency, and the volume of the cooled gas is reduced, so that the compressor can deliver more gas under the same conditions, so as to effectively expand the range of the processed gas volume. At the same time, the second cooling unit is used to cool the compressed gas again to absorb the large amount of heat generated during the compression process, thereby reducing the work required for the next level of compression, which is conducive to saving power consumption. In addition, the motor, the compressor, the first cooling unit, the second cooling unit, and the first separation unit and the second separation unit are detachably mounted on the first surface of the chassis in a modular manner, which can be installed or disassembled separately, making it more convenient for workers to install and increase configuration, which is conducive to reducing labor intensity, and can also make the structure more compact and reduce space occupancy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of an embodiment of a compressor device of the present application;

[0023] Figure 2 is a schematic top view of a compressor device of the present application;

[0024] Figure 3 It is a front view schematic diagram of a compressor device of the present application.

[0025] Numbers in the figure:

[0026] 10. chassis; 20. compression assembly; 21. first compressor; 22. second compressor; 30. cooling assembly; 31. first cooling unit; 311. first cooler; 312. second cooler; 32. second cooling unit; 321. third cooler; 322. fourth cooler; 40. separation assembly; 41. first separation unit; 411. first separator; 42. second separation unit; 421. second separator; 422. second separator; 50. connecting pipe; 60. docking pipe; 70 , second pipeline; 80, filter; 90, first check valve; 100, third pipeline; 110, first vent valve; 120, fourth pipeline; 130, fifth pipeline; 140, second vent valve; 150, second check valve; 160, cooling fan; 170, crankcase; 180, power pump; 190, first vent pipeline; 200, third vent valve; 210, second vent pipeline; 220, fourth vent valve; 230, motor; 240, instrument box; 250, level meter; X, first direction. DETAILED DESCRIPTION

[0027] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] Please refer to Figures 1 to 3 An embodiment of the present application provides a compressor device, which includes a base frame 10, a compression assembly 20, a cooling assembly 30 and a separation assembly 40.

[0030] Specifically, the chassis 10 has a first surface and a second surface opposite to each other in a first direction X; the compression assembly 20 includes a motor 230 and at least one compressor mounted on the first surface, all compressors are connected in series in sequence, and the motor 230 is connected to one of the compressors to provide the power required to drive the compressor to operate. The cooling assembly 30 includes a first cooling unit 31 and a second cooling unit 32 mounted on the first surface, the first cooling unit 31 is used to cool the gas before entering the compressor, and the second cooling unit 32 is used to cool the gas after the compression process. Among them, the first cooling unit 31 includes a first cooler 311 and a second cooler 312, the first cooler 311 is located above the second cooler 312, and is connected in parallel with the second cooler 312 through a connecting pipe 50, and the air inlet end of the first cooler 311 is connected to a docking pipe 60. The separation assembly 40 includes a first separation unit 41 and a second separation unit 42 installed on the first surface. The first separation unit 41 is connected in series between the first cooling unit 31 and the compressor, and is used to separate the gas before entering the compressor. The second separation unit 42 is connected in series between the compressor and the second cooling unit 32, and is used to separate the gas after compression processing.

[0031] In the compressor device of the present application, the first cooling unit 31 is used to cool the gas to be treated to reduce the intake temperature of the gas, and the cooled gas is separated and processed by the first separation unit 41, and then the separated gas is passed into the compressor for compression processing, and then the compressed gas is passed into the second cooling unit 32 for cooling, and finally the compressed gas is separated again by the second separation unit 42, and the separated gas is passed into another device, so as to realize the gas transportation from one device to another. That is to say, the compressor adopts the method of connecting the first cooler 311 and the second cooler 312 in parallel to cool the gas to be treated, so as to quickly reduce the intake temperature of the gas before entering the compressor, which can effectively improve the compression efficiency, and the volume of the cooled gas is reduced, so that the compressor can transport more gas under the same conditions, so as to effectively expand the range of the amount of gas to be treated, and at the same time, the second cooling unit 32 is used to cool the compressed gas again to absorb a large amount of heat generated during the compression process, thereby reducing the work required for the next stage of compression, which is conducive to saving power consumption. In addition, the motor 230, the compressor, the first cooling unit 31, the second cooling unit 32, the first separation unit 41 and the second separation unit 42 are detachably mounted on the first surface of the base frame 10 in a modular manner, and can be installed or disassembled separately, which is more convenient for workers to install and add configurations, helps to reduce labor intensity, and can also make the structure more compact and reduce space occupancy.

[0032] For example, in order to ensure the stability of the installation and the need for subsequent configuration addition, it is necessary to ensure that the chassis 10 has sufficient structural strength to prevent deformation or collapse after the motor 230, the compressor, the first cooling unit 31, the second cooling unit 32, and the first separation unit 41 and the second separation unit 42 are installed. To this end, the chassis 10 in this embodiment can be made of a metal material (such as channel steel, I-beam, etc.) with strong bending strength and load-bearing capacity.

[0033] In addition, in order to facilitate the installation of components such as the motor 230, the compressor, the first cooling unit 31, the second cooling unit 32, the first separation unit 41, and the second separation unit 42, corresponding brackets (not shown) are welded on the first surface of the base frame 10 to provide support for local fixation. At the same time, embedded parts holes are reserved on the second surface of the base frame 10 so that the embedded parts can be installed at the embedded parts holes, thereby ensuring that they can be firmly fixed to the ground.

[0034] Exemplarily, the first separation unit 41 is used to separate the gas before entering the compressor to remove impurities in the gas, improve the purity of the gas, and prevent impurities in the gas from entering the compressor, thereby causing damage to the compressor. The second separation unit 42 is used to separate the compressed gas, also to remove impurities in the compressed gas to improve the purity of the gas and prevent impurities in the gas from entering the next device. To this end, the first separation unit 41 and the second separation unit 42 can use separation components of the same structure, or can use separation components of different structures, which is not limited.

[0035] Exemplarily, the second cooling unit 32 is used to cool the gas after the compression process. To this end, the second cooling unit 32 can be composed of multiple coolers connected in series, and the specific number can be determined according to actual conditions. For example: if the heat generated during the compression process can be quickly cooled by only one cooler, the second cooling unit 32 can be one cooler; if the heat generated during the compression process is large and cannot be quickly cooled by one cooler, the second cooling unit 32 can be composed of two or more coolers connected in series to cool the gas in a step-by-step manner.

[0036] In practical applications, the second cooling unit 32 uses two coolers connected in series, namely the third cooler 321 and the fourth cooler 322. The third cooler 321 is connected in series with the fourth cooler 322 through the first pipeline, and the air inlet end of the third cooler 321 is connected to the second separation unit 42. That is to say, the gas compressed by the compressor is passed into the second separation unit 42, and after the separation action of the second separation unit 42, it first enters the third cooler 321 for cooling, and then passes into the fourth cooler 322 for cooling, and finally the cooled gas is passed into the second separation unit 42 for separation. In this way, the gas is cooled by connecting the coolers in series, so as to gradually reduce the gas temperature, thereby ensuring the compression efficiency, and at the same time, it can also reduce the temperature in the compressor housing, which is beneficial to improving the operating performance and service life of the compressor.

[0037] In one embodiment, the first separation unit 41 includes a first separator 411, the first separator 411 is connected to the connecting pipe 50 through the second pipe 70, and the outlet end of the first separator 411 is connected to the inlet end of the compressor through the third pipe 100, and the three pipes are provided with a first vent valve 110, and the first separator 411 is used to separate the gas before entering the compressor. The second separation unit 42 includes a second separator 422 and a third separator 423, the second separator 422 is connected in series between the compressor and the third cooler 321, the inlet end of the third separator 423 is connected to the outlet end of the fourth cooler 322 through the fourth pipe 120, and the outlet end of the third separator 423 is connected to the fifth pipe 130 for connecting to an external device, so as to pass the treated gas to the external device.

[0038] That is, the second pipe 70 is connected to the connecting pipe 50, so that the gas cooled by the first cooler 311 and the second cooler 312 is passed into the first separator 411 through the second pipe 70, and then the gas separated in the first separator 411 is passed into the compressor for compression processing by using pipe fittings, and then the compressed gas is secondary separated by the second separator 422, so that the impurities mixed in the compressed gas are preliminarily separated, and then cooled step by step by the third cooler 321 and the fourth cooler 322 in turn, and finally the cooled gas is separated again by the third separator 423 and transported to external equipment. In this way, the gas before compression is separated by the first separator 411 to remove impurities in the gas, improve the purity of the gas, and prevent impurities in the gas from entering the compressor, thereby causing damage to the compressor. At the same time, the gas coming out of the compressor is separated by the second separator 422, and the gas cooled by the third cooler 321 and the fourth cooler 322 is separated by the third separator 423 to improve the purity of the gas and prevent impurities in the gas from entering the next device.

[0039] Exemplarily, by setting the first vent valve 110 on the third pipeline 100, and the first vent valve 110 is interlocked with the pressure instrument in the instrument box 240, when the compressor stops working or the system pressure exceeds the set value during operation, the first vent valve 110 is controlled to open automatically, thereby releasing the excess pressure into the atmosphere, preventing the pressure in the system from being too high, and protecting the compressor and related pipelines.

[0040] In one embodiment, a filter 80 and a first check valve 90 are disposed on the second pipeline 70 , and the filter 80 is used to filter the gas leading to the first separator 411 .

[0041] Exemplarily, the gas cooled by the first cooler 311 and the second cooler 312 will be mixed with foreign particles, and some foreign particles will still not be removed by the separation effect of the first separator 411 alone. If the foreign particles are not filtered and then passed into the compressor for compression, it is easy to cause damage to the compressor. In this regard, in this embodiment, a filter 80 is set on the second pipeline to first filter the gas using the filter 80, and then enter the first separation for separation, so that the foreign particles can be removed, and the impurities in the gas are prevented from entering the compressor, thereby causing damage to the compressor. It should be noted that the filter 80 in this embodiment is a Y-type filter 80, and the particle size of the solid particles filtered by it is between 80 and 90 meshes.

[0042] In addition, the first check valve 90 provided on the second pipeline is used to prevent gas backflow. For example, when the compressor stops working, the first check valve 90 will be closed to prevent the gas from flowing from the first separator 411 back to the first cooler 311 or the second cooler 312, thereby avoiding equipment failure or safety accidents. When the compressor works normally, the first check valve 90 is opened to allow the cooled gas to flow to the first separator 411 for separation.

[0043] In one embodiment, the end of the fifth pipeline 130 away from the third separator 423 is connected to a second check valve 150, and the third pipeline 100 is also connected to a second vent valve 140. That is, by setting the second check valve 150 on the fifth pipeline 130, the compressed gas flows to the external device without backflow, thereby ensuring the safety of the pipeline. The second vent valve 140 is interlocked with the pressure instrument in the instrument box 240, so that when the compressor stops working or the system pressure exceeds the set value during operation, the second vent valve 140 can be controlled to open automatically, thereby releasing the excess pressure into the atmosphere, preventing the pressure in the system from being too high, thereby protecting the compressor device and related pipelines.

[0044] In one embodiment, the cooling assembly 30 further includes a cooling fan 160, which is connected to the fourth cooler 322 and is used to cool the cooling medium in the fourth cooler 322. In this way, the hot air after heat exchange in the fourth cooler 322 is quickly discharged by using the cooling fan 160, thereby cooling the cooling medium in the fourth cooler 322, which is conducive to improving the cooling effect of the fourth cooler 322. It should be noted that the cooling fan 160 is an axial flow fan, but is not limited to this.

[0045] In one embodiment, a crankcase 170 is further included, and a crankshaft is arranged in the crankcase 170; the compressor includes a first compressor 21 and a second compressor 22, the first compressor 21 and the second compressor 22 are connected, the motor 230 is connected to the second compressor 22 through the crankshaft, and the air inlet end of the first compressor 21 is connected to the first separation unit 41, and the air outlet end of the second compressor 22 is connected to the second separation unit 42. In this way, by arranging the crankcase 170 between the first compressor 21 and the second compressor 22, and using the crankshaft in the crankcase 170 to drive the first compressor 21 and the second compressor 22 to be connected, and then connecting the motor 230 to the second compressor 22, when the motor 230 drives the second compressor 22 to work, the first compressor 21 is also driven to work.

[0046] In one embodiment, a power pump 180 is further included, which is installed on the first surface and located below the second compressor 22, and is used to pump external lubricating oil into the second compressor 22 for lubrication. In this way, the external lubricating oil can be pumped into the second compressor 22 by the power pump 180 to lubricate the moving parts inside the second compressor 22, thereby realizing a separate supply of lubricating oil to the second compressor 22, having a better lubrication effect, and being conducive to improving compression efficiency.

[0047] In one embodiment, a first vent pipe 190 and a third vent valve 200 are further included, one end of the first vent pipe 190 is connected to the first compressor 21, and the third vent valve 200 is arranged on the first vent pipe 190 to control the opening or closing of the first vent pipe 190. In this way, when the first compressor 21 stops working or the system pressure exceeds the set value during operation, the third vent valve 200 is controlled to open automatically, thereby releasing the excess pressure into the atmosphere, preventing the pressure in the system from being too high, and protecting the first compressor 21 and related pipes.

[0048] In one embodiment, a second vent pipe 210 and a fourth vent valve 220 are further included. One end of the second vent pipe 210 is connected to the second compressor 22, and the other end is connected to the fourth cooler 322. The fourth control valve is provided on the second vent pipe 210 to control the opening or closing of the second vent pipe 210. In this way, when the second compressor 22 stops working or the system pressure exceeds the set value during operation, the fourth vent valve 220 is controlled to open automatically, thereby releasing the excess pressure into the atmosphere, preventing the pressure in the system from being too high, and thereby protecting the second compressor 22 and related pipes.

[0049] In one embodiment, the first separator 411, the second separator 422 and the third separator 423 are all connected to a liquid level meter 250, so that the staff can timely understand the liquid level of the cooling medium in the first separator 411, the second separator 422 and the third separator 423 by observing the liquid level changes on the liquid level meter 250.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A compressor device, characterized in that: include: a chassis having a first surface and a second surface opposing each other in a first direction; A compression assembly, comprising a motor mounted on the first surface and at least one compressor, all of the compressors are connected in series, and the motor is connected to one of the compressors to provide the power required to drive the compressor to operate; A cooling assembly, comprising a first cooling unit and a second cooling unit mounted on a first surface, wherein the first cooling unit is used to cool the gas before entering the compressor, and the second cooling unit is used to cool the gas after the compression process; wherein the first cooling unit comprises a first cooler and a second cooler, the first cooler is located above the second cooler and is connected in parallel with the second cooler through a connecting pipe, and the air inlet end of the first cooler is connected to a docking pipe; A separation assembly includes a first separation unit and a second separation unit installed on a first surface, wherein the first separation unit is connected in series between the first cooling unit and the compressor for separating the gas before entering the compressor, and the second separation unit is connected in series between the compressor and the second cooling unit for separating the gas after compression processing.

2. The compressor device according to claim 1, characterized in that The second cooling unit includes a third cooler and a fourth cooler, the third cooler is connected in series with the fourth cooler through a first pipeline, and the air inlet end of the third cooler is connected to the second separation unit.

3. The compressor device according to claim 2, characterized in that The first separation unit includes a first separator, the first separator is connected to the connecting pipeline through a second pipeline, and the gas outlet end of the first separator is connected to the gas inlet end of the compressor through a third pipeline, and the third pipeline is provided with a first vent valve, and the first separator is used to separate the gas before entering the compressor; The second separation unit includes a second separator and a third separator, the second separator is connected in series between the compressor and the third cooler, the air inlet end of the third separator is connected to the air outlet end of the fourth cooler through a fourth pipe, and the air outlet end of the third separator is connected to a fifth pipe for connecting to an external device so as to pass the treated gas to the external device.

4. The compressor device according to claim 3, characterized in that The second pipeline is provided with a filter and a first check valve, and the filter is used to filter the gas leading to the first separator.

5. The compressor device according to claim 3, characterized in that One end of the fifth pipeline away from the third separator is connected to a second check valve, and the third pipeline is also connected to a second vent valve.

6. The compressor device according to claim 1, characterized in that The cooling assembly further includes a cooling fan, which is connected to the fourth cooler and is used to cool the cooling medium in the fourth cooler.

7. The compressor device according to claim 2, characterized in that It also includes a crankcase, in which a crankshaft is arranged; The compressor includes a first compressor and a second compressor, the first compressor is connected to the second compressor, the motor is connected to the second compressor through the crankshaft, and the intake end of the first compressor is connected to the first separation unit, and the outlet end of the second compressor is connected to the second separation unit.

8. The compressor device according to claim 7, characterized in that It also includes a power pump, which is installed on the first surface and located below the second compressor, and is used to pump external lubricating oil into the second compressor for lubrication.

9. The compressor device according to claim 7, characterized in that It also includes a first vent pipe and a third vent valve, one end of the first vent pipe is connected to the first compressor, and the third vent valve is arranged on the first vent pipe to control the opening or closing of the first vent pipe.

10. The compressor device according to claim 7, characterized in that It also includes a second vent pipe and a fourth vent valve, one end of the second vent pipe is connected to the second compressor, and the other end is connected to the fourth cooler, and the fourth control valve is arranged on the second vent pipe to control the conduction or closing of the second vent pipe.