Compressor system and working method thereof

Abstract

The invention provides a compressor system and a working method of the compressor system. The compressor system comprises a compressor assembly, a gas-liquid separator, an oil-gas separator and a gas pipeline. The compressor assembly comprises a first compression chamber and a second compression chamber which are independently arranged, and the first compression chamber, the gas-liquid separator, the second compression chamber and the oil-gas separator are sequentially communicated through the gas pipeline; the gas-liquid separator is used for separating an oil-gas mixture guided out of the first compression cavity, and the oil-gas separator is used for separating an oil-gas mixture guided out of the second compression cavity. The compressor system comprises the two compression cavities which are connected in series, and the gas-liquid separator is arranged between the two compression cavities, so that the volume efficiency and the polytropic efficiency of the compressor are effectively improved, the input specific power of the compressor system is improved, and the energy efficiency grade of the compressor system is improved.

Description

Technical Field

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

[0002] As a type of positive displacement compressor, oil-injected compressors have a large market share in the field of medium and low pressure (exhaust pressure 0.25Mpa ~ 1.4Mpa) compressors due to their simple and reliable structure and stable performance. According to incomplete statistics, the electricity consumption of air compressors accounts for 9.5% to 10% of the total power generation in the country. In the industrial field, the electricity consumption of air compressors accounts for 10% to 35% of the total electricity consumption of enterprises. In industries with a large demand for air compressors, the electricity consumption of air compressors accounts for more than 65% of the total electricity consumption of enterprises. With the advancement of energy conservation and emission reduction in recent years, as well as the demand of enterprises to reduce costs and increase efficiency, facing such high electricity consumption of air compressors, the market's requirements for the energy efficiency of compressor systems have gradually increased.

[0003] The structure of the oil-injected twin-screw compressor on the market is generally a two-stage compressor integrated structure or a traditional single-stage compressor structure. In a two-stage twin-screw compressor, the first-stage compressor and the second-stage compressor are generally distributed vertically. The air enters from the air inlet on the upper part of the compressor, is first compressed in the upper first-stage compressor, and then enters the narrow middle channel between the first-stage compressor and the second-stage compressor. In the middle channel, the compressed gas and the cooling oil are mixed and cooled, and then enter the second-stage compressor for compression and discharge. Compared with the traditional single-stage twin-screw compressor, the two-stage twin-screw compressor increases the air compression stroke and inter-stage cooling of the air, and the compressor energy efficiency has been improved to a certain extent.

[0004] On July 1, 2020, the national standard "Energy Efficiency Limit Values ​​and Energy Efficiency Grades for Volumetric Air Compressors" (GB 19153-2019) was implemented. According to this standard, taking the rated power of the drive motor as 250KW, when the rated exhaust pressure is 0.7MPa and 0.8MPa respectively, the primary energy efficiency input specific power of the compressor system is 5.3 (Kwm 3 / min) and 5.7(Kwm 3 / min). However, even for compressor systems using two-stage twin-screw compressors, the proportion of companies whose compressor systems can stably meet the first-level energy efficiency standards is still less than 5%. Summary of the invention

[0005] The object of the present invention is to provide a compressor system and a working method of the compressor system. The compressor system includes two compression chambers connected in series, and a gas-liquid separator is arranged between the two compression chambers to effectively increase the volumetric efficiency and variable efficiency of the compressor, improve the input specific power of the compressor system, and improve the energy efficiency level of the compressor system.

[0006] To achieve the above-mentioned purpose, the present invention provides a compressor system, including a compressor assembly, a gas-liquid separator, an oil-gas separator and a gas pipeline; the compressor assembly includes a first compression chamber and a second compression chamber that are independently arranged, and the first compression chamber, the gas-liquid separator, the second compression chamber and the oil-gas separator are connected in sequence through the gas pipeline; the gas-liquid separator is used to separate the oil-gas mixture derived from the first compression chamber, and the oil-gas separator is used to separate the oil-gas mixture derived from the second compression chamber.

[0007] Optionally, the compressor system further includes a gas cooler, which is disposed between the gas-liquid separator and the second compression chamber and is used for cooling the gas separated by the gas-liquid separator.

[0008] Optionally, the compressor assembly includes a cylinder body, a first compression unit and a second compression unit, and the first compression unit and the second compression unit are respectively connected to the cylinder body; the first compression unit encloses to form the first compression chamber, and the second compression unit encloses to form the second compression chamber.

[0009] Optionally, the compressor assembly includes a first compressor and a second compressor, the first compressor includes the first compression chamber, and the second compressor includes the second compression chamber.

[0010] Optionally, the compressor system also includes a first oil return pipeline and a second oil return pipeline; one end of the first oil return pipeline is connected to the gas-liquid separator, and the other end is connected to the first compression chamber, and one end of the second oil return pipeline is connected to the oil-gas separator, and the other end is connected to the second compression chamber.

[0011] Optionally, the gas-liquid separator is configured as a coarse separation structure or a fine separation structure.

[0012] Optionally, the compressor system also includes a liquid level balancing valve and a third oil return pipeline, one end of the third oil return pipeline is connected to the gas-liquid separator, and the other end is connected to the oil-gas separator; the liquid level balancing valve is arranged between the gas-liquid separator and the oil-gas separator; the liquid level balancing valve is used to open when the liquid level difference between the oil-gas separator and the gas-liquid separator is greater than a preset value, so that the liquid in the oil-gas separator enters the gas-liquid separator through the liquid level balancing valve.

[0013] Optionally, the compressor system further includes a first oil filter and a first oil cooler connected to each other, wherein the first oil filter and the first oil cooler are both arranged on the first oil return pipeline, the first oil cooler is connected to the gas-liquid separator, and the first oil filter is connected to the first compression chamber.

[0014] And / or, the compressor system also includes a second oil filter and a second oil cooler connected to each other, the second oil filter and the first oil cooler are both arranged on the second oil return pipeline, the second oil cooler is connected to the oil-gas separator, and the second oil filter is connected to the second compression chamber.

[0015] Optionally, the compressor system also includes a fourth oil return pipeline, one end of which is inserted into the oil-gas separator, and the other end is connected to the second compression chamber; the fourth oil return pipeline is used to introduce the liquid in the oil-gas separator into the second compression chamber.

[0016] Optionally, the compressor assembly includes at least one screw compressor.

[0017] To achieve the above object, the present invention further provides a working method of a compressor system, including any one of the compressor systems described above, the working method comprising:

[0018] Step S01: starting the compressor assembly, allowing air to enter the first compression chamber for compression and forming an oil-gas mixture;

[0019] Step S02: the oil-gas mixture derived from the first compression chamber flows to the gas-liquid separator through the gas pipeline, and is separated into gas and liquid in the gas-liquid separator;

[0020] Step S03: the gas separated by the gas-liquid separator enters the second compression chamber through the gas pipeline for compression to form an oil-gas mixture again;

[0021] Step S04: the oil-gas mixture derived from the second compression chamber flows to the oil-gas separator through the gas pipeline, and is separated into gas and liquid in the oil-gas separator;

[0022] Step S05: the oil-gas separator outputs the separated gas to the outside.

[0023] Optionally, the compressor system further comprises a gas cooler, which is disposed between the gas-liquid separator and the second compression chamber and is used to cool the gas separated by the gas-liquid separator;

[0024] In step S03, the step of the gas separated by the gas-liquid separator entering the second compression chamber includes: the gas separated by the gas-liquid separator enters the gas cooler through the gas pipeline for cooling, and the cooled gas enters the second compression chamber through the gas pipeline.

[0025] Optionally, the compressor system further includes a first oil return pipeline and a second oil return pipeline; one end of the first oil return pipeline is connected to the gas-liquid separator, and the other end is connected to the first compression chamber, and one end of the second oil return pipeline is connected to the oil-gas separator, and the other end is connected to the second compression chamber;

[0026] Step S03 also includes: the liquid separated by the gas-liquid separator flows back into the first compression chamber through the first oil return pipeline;

[0027] Step S05 also includes: the liquid separated by the oil-gas separator flows back into the second compression chamber through the second oil return pipeline.

[0028] Optionally, the working method of the compressor system further includes a liquid level balancing valve and a third oil return pipeline, one end of the third oil return pipeline is connected to the gas-liquid separator, and the other end is connected to the oil-gas separator; the liquid level balancing valve is arranged between the gas-liquid separator and the oil-gas separator;

[0029] The working method also includes:

[0030] Step S06: When the difference between the liquid levels in the oil-gas separator and the gas-liquid separator is greater than a preset value, the liquid level balancing valve is opened, and the liquid in the oil-gas separator enters the gas-liquid separator through the liquid level balancing valve.

[0031] The present invention provides a compressor system and a working method of the compressor system, wherein the compressor system includes a compressor assembly, wherein the compressor assembly includes a first compression chamber and a second compression chamber that are independently arranged, wherein the first compression chamber and the second compression chamber are connected in series, and a gas-liquid separator is arranged between the two compression chambers. Air can be compressed in the compressor system by passing through the first compression chamber and the second compression chamber in sequence, thereby effectively increasing the volumetric efficiency and the polytropic efficiency of the compressor, improving the input specific power of the compressor system, and improving the energy efficiency level of the compressor.

[0032] In addition, the compressor system can preferably be equipped with an air cooler between the gas-liquid separator and the second compression chamber. The air cooler can allow the gas compressed in the first compression chamber and separated by the gas-liquid separator to be fully cooled before entering the second compression chamber. This can increase the suction volume and compression efficiency of the second compression chamber, make the gas in the second compression chamber close to isothermal compression, and improve the variable compression efficiency of the compressor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of a compressor system in the prior art;

[0034] Figure 2 It is a structural schematic diagram of a compressor system in a preferred embodiment of the present invention;

[0035] Figure 3 It is a structural schematic diagram of a compressor assembly in a preferred embodiment of the present invention;

[0036] Figure 4 The figure is a flow chart of the working method of the compressor system in a preferred embodiment of the present invention.

[0037] In the figure:

[0038] Host 100; separator 200;

[0039] Compressor assembly 1; first compression chamber 11; second compression chamber 12; cylinder body 13; first compression unit 14; second compression unit 15; gas-liquid separator 2; oil-gas separator 3; oil-gas cylinder 31; guide cylinder 32; oil storage area 33; minimum pressure valve 34; pressure sensor 35; gas pipeline 41; first oil return pipeline 42; second oil return pipeline 43; third oil return pipeline 44; fourth oil return pipeline 45; gas cooler 5; liquid level balancing valve 6; first oil filter 71; first oil cooler 72; second oil filter 73; second oil cooler 74; air filter 81; intake valve 82; first temperature sensor 91; second temperature sensor 92. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or a connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0043] Furthermore, those skilled in the art may combine and associate different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0044] Reference Figure 1 As shown, in the existing compressor system, air can enter the main unit 100 (i.e., the compressor) after being filtered for compression and forming a gas-liquid mixture, which is then transported to the separator 200 through a pipeline for gas-liquid separation, the gas separated from the gas-liquid mixture is transported to the outside, and the liquid separated from the gas-liquid mixture flows back to the main unit 100. The existing compressor system has a low working efficiency, and the input specific power often cannot reach the first-level energy efficiency standard, and cannot meet the requirements of energy conservation and emission reduction of enterprises.

[0045] To solve the above problems, refer to Figure 2 As shown, a preferred embodiment of the present invention provides a compressor system, including a compressor assembly 1, a gas-liquid separator 2, an oil-gas separator 3 and a gas pipeline 41. The compressor assembly 1 includes a first compression chamber 11 and a second compression chamber 12 which are independently arranged. The first compression chamber 11, the gas-liquid separator 2, the second compression chamber 12 and the oil-gas separator 3 are sequentially connected through the gas pipeline 41. The gas-liquid separator 2 is used to separate the oil-gas mixture derived from the first compression chamber 11, and the oil-gas separator 2 is used to separate the oil-gas mixture derived from the second compression chamber 12. Air can pass through the first compression chamber 11, the gas-liquid separator 2, the second compression chamber 12 and the oil-gas separator 3 in sequence, and is transported to the outside through the oil-gas separator 3 after double compression in the first compression chamber 11 and the second compression chamber 12.

[0046] The present application provides a compressor system, which includes a compressor assembly 1, wherein the compressor assembly 1 includes a first compression chamber 11 and a second compression chamber 12 which are independently arranged, wherein the first compression chamber 11 and the second compression chamber 12 are connected in series, and a gas-liquid separator 2 is arranged between the two compression chambers. Air can be compressed in the compressor system by passing through the first compression chamber 11 and the second compression chamber 12 in sequence, which can effectively increase the volumetric efficiency and the multivariate efficiency of the compressor, improve the input specific power of the compressor system, and improve the energy efficiency level of the compressor.

[0047] In more detail, the gas-liquid separator 2 can perform gas-liquid separation on the oil-gas mixture derived from the first compression chamber 11 , and can separate a larger proportion of lubricating oil, thereby increasing the volumetric efficiency of the second compression chamber 12 .

[0048] In a preferred embodiment, the compressor system further includes a gas cooler 5 , which is disposed between the gas-liquid separator 2 and the second compression chamber 12 and is used to cool the gas separated by the gas-liquid separator 2 .

[0049] In more detail, the gas cooler 5 can fully cool the gas compressed by the first compression chamber 11 and separated by the gas-liquid separator 2 before entering the second compression chamber 12. This can increase the suction volume and compression efficiency of the second compression chamber 12, make the gas in the second compression chamber 12 close to isothermal compression, and improve the variable compression efficiency of the compressor system.

[0050] Reference Figure 3 As shown, in a preferred embodiment, the compressor assembly 1 includes a cylinder body 13, a first compression unit 14 and a second compression unit 15, and the first compression unit 14 and the second compression unit 15 are respectively connected to the cylinder body 13. The first compression unit 14 encloses a first compression chamber 11, and the second compression unit 15 encloses a second compression chamber 12. A driving device (such as a motor) can drive the first compression unit 14 and the second compression unit 15 to operate respectively, so that the first compression unit 14 and the second compression unit 15 compress the air respectively. At this time, two compression chambers can be set on one compressor assembly 1, and the first compression chamber 11, the gas-liquid separator 2, the second compression chamber 12 and the oil-gas separator 3 are connected in series at the same time, so as to perform two-stage compression on the air and improve the working efficiency of the compressor system.

[0051] Reference Figure 2 As shown, in another preferred embodiment, the compressor assembly 1 includes a first compressor and a second compressor (not numbered), the first compressor includes a first compression chamber 11, and the second compressor includes a second compression chamber 12. In this case, two compressors can be arranged in the compressor system, and the first compressor, the gas-liquid separator 2, the second compressor and the oil-gas separator 3 are connected in series to perform two-stage compression on the air.

[0052] The present application does not limit the type of the compressor assembly 1. In one embodiment, the compressor assembly 1 includes at least one screw compressor (including a single-stage twin-screw compressor or a two-stage twin-screw compressor), that is, the first compressor and the second compressor are preferably screw compressors. In another embodiment, the compressor assembly 1 includes at least one oil-injected compressor or other types of air compressors, that is, the first compressor and the second compressor can be set as oil-injected compressors or other types of air compressors.

[0053] Continue to refer to Figure 2 The compressor system further includes a first oil return pipeline 42 and a second oil return pipeline 43. One end of the first oil return pipeline 42 is connected to the gas-liquid separator 2, and the other end is connected to the first compression chamber 11. The liquid (i.e., lubricating oil) in the gas-liquid separator 2 can flow back to the first compression chamber 11 through the first oil return pipeline 42, forming an internal circulation of the lubricating oil in the compressor system. One end of the second oil return pipeline 43 is connected to the oil-gas separator 3, and the other end is connected to the second compression chamber 12. The liquid (i.e., lubricating oil) in the oil-gas separator 3 can flow back to the second compression chamber 12 through the second oil return pipeline 43, forming another internal circulation of the lubricating oil in the compressor system.

[0054] It should be noted that both the gas-liquid separator 2 and the oil-gas separator 3 can be applied to the compressor system to separate the oil-gas mixture.

[0055] Furthermore, the oil-gas separator 3 is preferably configured as a fine separation structure. The fine separation structure here refers to a device that can better separate the oil-gas mixture into gas and liquid. In the fine separation structure, the gas separated from the oil-gas mixture may contain less liquid or almost no liquid. In one example, the fine separation structure can be configured as a separator that separates through a high-precision filter element. The types of fine separation structures include but are not limited to filter element separators, centrifugal separators or baffle separators.

[0056] In a preferred embodiment, the gas-liquid separator 2 is configured as a coarse separation structure. The coarse separation structure here refers to a device that can roughly separate the oil-gas mixture into gas and liquid. In the coarse separation structure, the gas separated from the oil-gas mixture may contain a certain volume of liquid. In one example, the coarse separation structure can be configured as a separator that separates through a filter element of a low precision grade. Similarly, the types of coarse separation structures also include but are not limited to filter element separators, centrifugal separators or baffle separators.

[0057] Furthermore, when the gas-liquid separator 2 is set to a coarse separation structure, since the coarse separation structure may cause a certain volume of liquid to be carried in the separated gas, the amount of liquid separated in the coarse separation structure is small, and it may not be possible to provide a sufficient volume of lubricating oil to the first compression chamber 11. Since the oil-gas separator 3 is a fine separation structure, the volume of the liquid separated in the oil-gas separator 3 is generally greater than the volume of the liquid separated in the gas-liquid separator 2.

[0058] To solve the above problems, refer to Figure 2As shown, in a preferred case, the compressor system further includes a liquid level balancing valve 6 and a third oil return pipeline 44, one end of the third oil return pipeline 44 is connected to the gas-liquid separator 2, and the other end is connected to the oil-gas separator 3. The liquid level balancing valve 6 is arranged between the gas-liquid separator 2 and the oil-gas separator 3. The liquid level balancing valve 6 is used to open when the liquid level difference between the oil-gas separator 3 and the gas-liquid separator 2 is greater than a preset value, so that the liquid in the oil-gas separator 3 enters the gas-liquid separator 2 through the liquid level balancing valve 6, and then the gas-liquid separator 2 is replenished with oil.

[0059] In this way, when the difference in liquid levels between the oil-gas separator 3 and the gas-liquid separator 2 is greater than a preset value, it indicates that less liquid remains in the gas-liquid separator 2. At this time, the liquid level balancing valve 6 can be opened automatically or manually, and the liquid in the oil-gas separator 3 can enter the gas-liquid separator 2 through the liquid level balancing valve 6 driven by the pressure difference between the oil-gas separator 3 and the gas-liquid separator 2 to replenish lubricating oil into the gas-liquid separator 2, thereby ensuring that the gas-liquid separator 2 can provide sufficient lubricating oil to the first compression chamber 11, thereby ensuring the normal operation of the compressor assembly 1.

[0060] In another preferred embodiment, the gas-liquid separator 2 can also be set as a fine separation structure. In this case, since the gas-liquid separator 2 can separate a sufficient volume of lubricating oil, the oil-gas separator 3 is not required to replenish the lubricating oil to the gas-liquid separator 2. In this case, the fourth oil return pipeline 45 may not be set in the compressor system.

[0061] Of course, when the gas-liquid separator 2 is configured as a fine separation structure, a fourth oil return pipeline 45 and a liquid level balance valve 6 may also be provided in the compressor system so as to replenish lubricating oil to the gas-liquid separator 2 through the oil-gas separator 3 when necessary.

[0062] Continue to refer to Figure 2 The compressor system preferably also includes a first oil filter 71 and a first oil cooler 72 connected to each other, and the first oil filter 71 and the first oil cooler 72 are both arranged on the first oil return pipeline 42. The first oil cooler 72 is connected to the gas-liquid separator 2, and the first oil filter 71 is connected to the first compression chamber 11. The liquid separated from the oil-gas mixture by the gas-liquid separator 2 can be cooled in the first oil cooler 72. After the liquid is cooled, it enters the first oil filter 71 through the first oil return pipeline 42 for filtration. The filtered liquid flows back to the first compression chamber 11 through the first oil return pipeline 42, thereby ensuring the normal operation of the compressor assembly 1.

[0063] Similarly, the compressor system preferably also includes a second oil filter 73 and a second oil cooler 74 connected to each other, and the second oil filter 73 and the first oil cooler 94 are both arranged on the second oil return pipeline 43. The second oil cooler 93 is connected to the oil-gas separator 3, and the second oil filter 94 is connected to the second compression chamber 12. The liquid of the oil-gas mixture after being separated by the oil-gas separator 3 can be cooled in the second oil cooler 74, and after the liquid is cooled, it enters the second oil filter 73 through the second oil return pipeline 43 for filtration, and the filtered liquid flows back to the second compression chamber 12 through the second oil return pipeline 43, thereby ensuring the normal operation of the compressor assembly 1.

[0064] Continue to refer to Figure 2 In a preferred embodiment, the compressor system further comprises a fourth oil return pipeline 45, one end of which is inserted into the oil-gas separator 3, and the other end of which is connected to the second compression chamber 12. The fourth oil return pipeline 45 is used to introduce the liquid in the oil-gas separator 3 into the second compression chamber 12.

[0065] In more detail, the oil-gas separator 3 includes an oil-gas cylinder 31 and a guide cylinder 32, and the guide cylinder 32 is placed in the internal space (not numbered) of the oil-gas cylinder 31. The bottom of the guide cylinder 32 forms an oil storage area 33, and the oil storage area 33 is used to store the liquid (i.e., lubricating oil) separated from the oil-gas mixture. One end of the fourth oil return pipe 64 is used to be inserted into the oil storage area 33, and the liquid in the oil storage area 33 can flow out of the oil-gas separator 3 through the fourth oil return pipe 64 and enter the second compression chamber 12 to further realize the circulation of the lubricating oil.

[0066] Furthermore, the oil-gas separator 3 further comprises a minimum pressure valve 34 , which is fixed on the cover of the oil-gas cylinder 31 and is used to discharge the gas separated in the guide cylinder 32 .

[0067] Furthermore, the oil-gas separator 3 further includes a pressure sensor 35 connected to the minimum pressure valve 34 , and the pressure sensor 35 is used to detect the internal pressure of the guide tube 32 .

[0068] In addition, the compressor system preferably further includes an air filter 81 and an air intake valve 82. The air filter 81 is communicated with the first compression chamber 11, and air can be delivered to the first compression chamber 11 after being filtered by the air filter 81. The air intake valve 82 is arranged between the air filter 81 and the first compression chamber 11 to allow or block air from entering the first compression chamber 11.

[0069] Preferably, the compressor system further includes a first temperature sensor 91 and a second temperature sensor 92, both of which are arranged on the gas pipeline 41. In a specific example, the first temperature sensor 91 can be arranged on the gas pipeline 41 connecting the oil-gas separator 3 and the air inlet end of the first compression chamber 11, and is used to detect the temperature of the gas separated by the oil-gas separator 3. The second temperature sensor 92 can be arranged on the gas pipeline 41 connecting the second compression chamber 12 and the oil-gas separator 3, and is used to detect the temperature of the oil-gas mixture entering the oil-gas separator 3.

[0070] Reference Figure 4 As shown, a preferred embodiment of the present invention further provides a working method of a compressor system, including any one of the above-mentioned compressor systems, and the working method includes:

[0071] Step S01: Start the compressor assembly 1, and air enters the first compression chamber 11 for compression to form an oil-gas mixture.

[0072] Step S02: the oil-gas mixture derived from the first compression chamber 11 flows to the gas-liquid separator 2 through the gas pipeline 41 and is separated into gas and liquid in the gas-liquid separator 2 .

[0073] Step S03: The gas separated by the gas-liquid separator 2 enters the second compression chamber 12 for compression and forms an oil-gas mixture again.

[0074] Step S04: the oil-gas mixture discharged from the second compression chamber 12 flows to the oil-gas separator 3 through the gas pipeline 41 and is separated into gas and liquid in the oil-gas separator 3 .

[0075] Step S05: the oil-gas separator 3 outputs the separated gas to the outside.

[0076] The working method of the compressor system provided in the present application can introduce air into the first compression chamber 11 and the second compression chamber 12 in sequence for compression, which can effectively increase the volumetric efficiency and variable efficiency of the compressor, improve the input specific power of the compressor system, and improve the reliability and working efficiency of the compressor system.

[0077] In the preferred embodiment, in step S03, the step of the gas separated by the gas-liquid separator 2 entering the second compression chamber 12 includes: the gas separated by the gas-liquid separator 2 enters the gas cooler 5 through the gas pipeline 41 for cooling, and the cooled gas enters the second compression chamber 12 through the gas pipeline 41.

[0078] The gas cooler 5 can fully cool the gas compressed by the first compression chamber 11 and separated by the gas-liquid separator 2 before entering the second compression chamber 12. This can increase the suction volume and compression efficiency of the second compression chamber 12, make the gas in the second compression chamber 12 close to isothermal compression, and improve the variable compression efficiency of the compressor system.

[0079] Preferably, step S03 further includes: the liquid separated by the gas-liquid separator 2 flows back into the first compression chamber 11 through the first oil return pipeline 42, thereby realizing the circulation of the lubricating oil in the compressor system.

[0080] More preferably, the step of returning the liquid separated by the gas-liquid separator 2 to the first compression chamber 11 through the first oil return pipeline 42 includes: the liquid separated by the gas-liquid separator 2 passes through the first oil cooler 72 and the first oil filter 71 in sequence and then returns to the first compression chamber 11.

[0081] Step S05 also includes: the liquid separated by the oil-gas separator 3 flows back to the second compression chamber 12 through the second oil return pipeline 43, thereby realizing the circulation of the lubricating oil in the compressor system.

[0082] More preferably, the step of returning the liquid separated by the oil-gas separator 3 to the second compression chamber 12 through the second oil return pipeline 43 includes: the liquid separated by the oil-gas separator 3 passes through the second oil cooler 74 and the second oil filter 73 in sequence and then returns to the second compression chamber 12.

[0083] In a preferred embodiment, the compressor system further includes a liquid level balancing valve 6 and a third oil return pipeline 44, one end of the third oil return pipeline 44 is connected to the gas-liquid separator 2, and the other end is connected to the oil-gas separator 3. The liquid level balancing valve 6 is arranged between the gas-liquid separator 2 and the oil-gas separator 3.

[0084] At this time, the working method of the compressor system also includes:

[0085] Step S06: When the liquid level difference between the oil-gas separator 3 and the gas-liquid separator 2 is greater than a preset value, the liquid level balance valve 6 is opened, and the liquid in the oil-gas separator 3 enters the gas-liquid separator 2 through the liquid level balance valve 6. In other words, the liquid in the oil-gas separator 3 can flow into the gas-liquid separator 2 under the pressure difference between the oil-gas separator 3 and the gas-liquid separator 2, so as to perform an oil replenishment operation on the gas-liquid separator 2.

[0086] In summary, the present invention provides a compressor system and a working method of the compressor system, wherein the compressor system includes a compressor assembly 1, wherein the compressor assembly 1 includes a first compression chamber 11 and a second compression chamber 12 which are independently arranged, wherein the first compression chamber 11 and the second compression chamber 12 are connected in series, and a gas-liquid separator 2 is arranged between the two compression chambers. Air can be compressed in the compressor system by passing through the first compression chamber 11 and the second compression chamber 12 in sequence, which can effectively increase the volumetric efficiency and the multivariable efficiency of the compressor, improve the input specific power of the compressor system, and improve the energy efficiency level of the compressor.

[0087] In addition, the compressor system can preferably be provided with an air cooler 5 between the gas-liquid separator 2 and the second compression chamber 12. The air cooler 5 can fully cool the gas compressed by the first compression chamber 11 and separated by the gas-liquid separator 2 before entering the second compression chamber 12. This can increase the suction volume and compression efficiency of the second compression chamber 12, make the gas in the second compression chamber 12 close to isothermal compression, and improve the variable compression efficiency of the compressor system.

[0088] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. A compressor system, characterized in that: It includes a compressor assembly, a gas-liquid separator, an oil-gas separator and a gas pipeline; the compressor assembly includes a first compression chamber and a second compression chamber that are independently arranged, and the first compression chamber, the gas-liquid separator, the second compression chamber and the oil-gas separator are connected in sequence through the gas pipeline; the gas-liquid separator is used to separate the oil-gas mixture derived from the first compression chamber, and the oil-gas separator is used to separate the oil-gas mixture derived from the second compression chamber.

2. The compressor system according to claim 1, characterized in that It also includes a gas cooler, which is arranged between the gas-liquid separator and the second compression chamber and is used to cool the gas separated by the gas-liquid separator.

3. The compressor system according to claim 1 or 2, characterized in that: The compressor assembly includes a cylinder body, a first compression unit and a second compression unit, wherein the first compression unit and the second compression unit are respectively connected to the cylinder body; the first compression unit encloses the first compression chamber, and the second compression unit encloses the second compression chamber.

4. The compressor system according to claim 1 or 2, characterized in that: The compressor assembly includes a first compressor including the first compression chamber and a second compressor including the second compression chamber.

5. The compressor system according to claim 1 or 2, characterized in that: It also includes a first oil return pipeline and a second oil return pipeline; one end of the first oil return pipeline is connected to the gas-liquid separator, and the other end is connected to the first compression chamber, and one end of the second oil return pipeline is connected to the oil-gas separator, and the other end is connected to the second compression chamber.

6. The compressor system according to claim 1, wherein: The gas-liquid separator is configured as a coarse separation structure or a fine separation structure.

7. The compressor system according to claim 1, wherein: It also includes a liquid level balancing valve and a third oil return pipeline, one end of the third oil return pipeline is connected to the gas-liquid separator, and the other end is connected to the oil-gas separator; the liquid level balancing valve is arranged between the gas-liquid separator and the oil-gas separator; the liquid level balancing valve is used to open when the liquid level difference between the oil-gas separator and the gas-liquid separator is greater than a preset value, so that the liquid in the oil-gas separator enters the gas-liquid separator through the liquid level balancing valve.

8. The compressor system according to claim 5, characterized in that The compressor system further includes a first oil filter and a first oil cooler connected to each other, wherein the first oil filter and the first oil cooler are both arranged on the first oil return pipeline, the first oil cooler is connected to the gas-liquid separator, and the first oil filter is connected to the first compression chamber. And / or, the compressor system also includes a second oil filter and a second oil cooler connected to each other, the second oil filter and the first oil cooler are both arranged on the second oil return pipeline, the second oil cooler is connected to the oil-gas separator, and the second oil filter is connected to the second compression chamber.

9. The compressor system according to claim 1 or 2, characterized in that: It also includes a fourth oil return pipeline, one end of which is inserted into the oil-gas separator, and the other end is connected to the second compression chamber; the fourth oil return pipeline is used to introduce the liquid in the oil-gas separator into the second compression chamber.

10. The compressor system according to claim 1 or 2, characterized in that: The compressor assembly includes at least one screw compressor.

11. A method for operating a compressor system, characterized in that: Comprising a compressor system as claimed in any one of claims 1 to 10, the working method comprising: Step S01: starting the compressor assembly, allowing air to enter the first compression chamber for compression and forming an oil-gas mixture; Step S02: the oil-gas mixture derived from the first compression chamber flows to the gas-liquid separator through the gas pipeline, and is separated into gas and liquid in the gas-liquid separator; Step S03: the gas separated by the gas-liquid separator enters the second compression chamber through the gas pipeline for compression to form an oil-gas mixture again; Step S04: the oil-gas mixture derived from the second compression chamber flows to the oil-gas separator through the gas pipeline, and is separated into gas and liquid in the oil-gas separator; Step S05: the oil-gas separator outputs the separated gas to the outside.

12. The operating method of the compressor system according to claim 11, characterized in that: The compressor system further comprises a gas cooler, which is disposed between the gas-liquid separator and the second compression chamber and is used to cool the gas separated by the gas-liquid separator; In step S03, the step of the gas separated by the gas-liquid separator entering the second compression chamber includes: the gas separated by the gas-liquid separator enters the gas cooler through the gas pipeline for cooling, and the cooled gas enters the second compression chamber through the gas pipeline.

13. The operating method of the compressor system according to claim 11, characterized in that: It also includes a first oil return pipeline and a second oil return pipeline; one end of the first oil return pipeline is connected to the gas-liquid separator, and the other end is connected to the first compression chamber, and one end of the second oil return pipeline is connected to the oil-gas separator, and the other end is connected to the second compression chamber; Step S03 also includes: the liquid separated by the gas-liquid separator flows back into the first compression chamber through the first oil return pipeline; Step S05 also includes: the liquid separated by the oil-gas separator flows back into the second compression chamber through the second oil return pipeline.

14. The operating method of the compressor system according to claim 11, characterized in that: It also includes a liquid level balance valve and a third oil return pipeline, one end of the third oil return pipeline is connected to the gas-liquid separator, and the other end is connected to the oil-gas separator; the liquid level balance valve is arranged between the gas-liquid separator and the oil-gas separator; The working method also includes: Step S06: When the difference between the liquid levels in the oil-gas separator and the gas-liquid separator is greater than a preset value, the liquid level balancing valve is opened, and the liquid in the oil-gas separator enters the gas-liquid separator through the liquid level balancing valve.

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