Compressor interstage cooling system and method

Abstract

The invention discloses a compressor interstage cooling system which combines thermo-acoustic refrigeration and water cooling for compressor interstage cooling and is used for enhancing interstage cooling. The system at least comprises two stages of compressors and a thermally-driven thermo-acoustic refrigerator, and the first-stage compressor compresses gas and discharges high-temperature and high-pressure gas. Thermally-driven thermoacoustic refrigeration is applied to interstage cooling of the compressor, the thermoacoustic refrigerator is driven by high-temperature gas compressed by the compressor to generate cooling capacity through the thermoacoustic effect, the cooling capacity acts on the compressed gas for cooling, and interstage cooling of the compressor is enhanced. Thermoacoustic refrigeration and water cooling are combined for compressor interstage cooling, and compared with a single water cooling mode, the thermoacoustic refrigeration can enhance the interstage cooling effect.

Description

Technical Field

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

[0002] The pressure range of a single-stage compressor is limited. For situations where a higher gas working pressure is required, the use of single-stage compression is not only uneconomical, but sometimes even impossible. Therefore, multi-stage compressors came into being. Multi-stage compressors divide the total pressure of the gas into several stages, compress the gas stage by stage according to the order of the stages, and cool the gas between stages. In this way, the power consumption of the multi-stage compressor is lower than that of the single-stage compressor, the cylinder volume utilization rate is improved, the exhaust temperature is reduced, the maximum gas force on the piston is also reduced, the load on each column of the compressor is reduced, and the mechanical life is also longer. However, the method of interstage cooling needs further study. Good interstage cooling helps to reduce the indicated work of the compressor and reduce the exhaust temperature. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a compressor interstage cooling system, which uses thermoacoustic refrigeration to reduce the compressor exhaust temperature, and uses the compressed high-temperature gas to provide heat to the thermoacoustic refrigerator, which generates cold. Compared with traditional interstage cooling technology, this method can reduce the exhaust temperature and compression power consumption.

[0004] In order to achieve the above object, the present invention adopts the following scheme.

[0005] A compressor interstage cooling system combines thermoacoustic cooling with water cooling for compressor interstage cooling, for enhancing interstage cooling;

[0006] The system comprises at least a two-stage compressor and a heat-driven thermoacoustic refrigerator, wherein the first-stage compressor compresses gas and discharges high-temperature and high-pressure gas.

[0007] Optionally, the system further includes: a heat exchanger, wherein the high-temperature and high-pressure gas is divided into two parts; one part enters the thermoacoustic engine core to provide heat for the thermoacoustic engine core, and the other part enters the heat exchanger.

[0008] Optionally, the heat-driven thermoacoustic refrigerator includes: a thermoacoustic engine core, a thermoacoustic refrigerator core, and a resonance tube.

[0009] Optionally, a resonance tube connects the thermoacoustic refrigerator core and the thermoacoustic engine core to adjust the phase of the sound.

[0010] Optionally, the outlet end of the first-stage compressor is connected to the inlet end of the hot-end heat exchanger in the core of the thermoacoustic engine and the gas-side inlet end of the heat exchanger.

[0011] Optionally, the outlet end of the hot-end heat exchanger in the thermoacoustic engine core is connected to the inlet end of the cold-end heat exchanger in the thermoacoustic refrigerator core.

[0012] Optionally, the outlet end of the gas side of the heat exchanger is connected to the inlet end of the cold end heat exchanger in the core of the thermoacoustic refrigerator.

[0013] Optionally, the outlet end of the cold end heat exchanger in the core of the thermoacoustic refrigerator is connected to the inlet end of the next stage compressor.

[0014] A compressor interstage cooling method, the method comprising:

[0015] Step 1: Compress the gas using a first-stage compressor and discharge the high-temperature and high-pressure gas; the discharged high-temperature and high-pressure gas is divided into two parts, one part enters the thermoacoustic engine core to provide heat for the thermoacoustic engine core, and the other part enters the heat exchanger;

[0016] Step 2, cooling the gas entering the heat exchanger to room temperature by water cooling;

[0017] Step 3: After heat exchange, the cooling water enters the circulating water reservoir for natural cooling;

[0018] Step 4: The gas entering the core of the thermoacoustic engine exchanges heat with the gas in the thermoacoustic engine through the hot-end heat exchanger inside the core of the thermoacoustic engine. The gas in the core of the thermoacoustic engine absorbs heat and heats up to start self-excited oscillation. The acoustic power generated by the oscillation is consumed by the plate stack inside the refrigerator through the phase modulation of the resonance tube and generates cooling capacity in the cold-end heat exchanger of the core of the thermoacoustic refrigerator.

[0019] Step 5: The compressed gas leaving the core of the thermoacoustic refrigerator and the gas cooled to room temperature by cooling water absorb cold energy in the cold end heat exchanger of the core of the thermoacoustic refrigerator, further reducing the exhaust temperature;

[0020] Step 6: The gas after the temperature is reduced enters the secondary compressor for compression. The working process after entering the secondary compressor is the same as the above process.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] The present invention combines thermoacoustic cooling with water cooling for interstage cooling of compressors. Compared with the single water cooling method, thermoacoustic cooling can enhance the interstage cooling effect. In addition, the heat-driven thermoacoustic refrigerator is driven by the waste heat generated during the compression process of the compressor. Compared with directly discharging the waste heat to the environment, the method of absorbing and utilizing the waste heat has a certain value.

[0023] The heat-driven thermoacoustic refrigerator generates cold energy after absorbing heat, and the cold energy is further used for inter-stage cooling of the compressor, thus realizing both the utilization of the exhaust waste heat of the compressor and the inter-stage cooling of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings illustrate exemplary embodiments of the present invention and together with the description serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0025] Figure 1 It is an example of a compressor interstage cooling system according to an embodiment of the present invention;

[0026] Figure 2 It is an example of a compressor interstage cooling system according to an embodiment of the present invention;

[0027] Figure 3 It is an example of a thermoacoustic engine core and a thermoacoustic refrigerator core of a compressor interstage cooling system according to an embodiment of the present invention;

[0028] Among them, a primary compressor 1, a heat-driven thermoacoustic refrigerator 2, a heat exchanger 3, a circulating water reservoir 4, and a secondary compressor 5;

[0029] Thermoacoustic engine core 21, resonance tube 22, thermoacoustic refrigerator core 23;

[0030] Thermoacoustic engine core room temperature end heat exchanger 211, thermoacoustic engine core hot end heat exchanger 213, thermoacoustic engine core regenerator 212; thermoacoustic refrigerator core room temperature end heat exchanger 231, thermoacoustic refrigerator core cold end heat exchanger 233, thermoacoustic refrigerator core regenerator 232. DETAILED DESCRIPTION

[0031] The following is combined with Figures 1 to 3 The present invention is further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant contents, rather than to limit the present invention. It is also necessary to explain that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings.

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as exemplary features that provide various details of some ways in which the technical concept of the present invention can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present invention.

[0034] The use of cross-hatching and / or shading in the accompanying drawings is generally used to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the accompanying drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed in a different order than described. For example, two successively described processes can be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.

[0035] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0036] For descriptive purposes, the present invention may use spatially relative terms such as "below", "beneath", "under", "lower", "above", "upper", "above", "higher", and "side (e.g., as in "sidewall")" to describe the relationship of one component to another (other) component as shown in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, components described as "below" or "beneath" other components or features would then be positioned "above" the other components or features. Thus, the exemplary term "below" can encompass both the "above" and "below" orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0037] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or the values ​​provided that will be recognized by those of ordinary skill in the art.

[0038] In one embodiment, the present invention provides a compressor interstage cooling system that combines thermoacoustic cooling with water cooling for compressor interstage cooling to enhance interstage cooling;

[0039] The system comprises at least a two-stage compressor and a heat-driven thermoacoustic refrigerator, wherein the first-stage compressor compresses gas and discharges high-temperature and high-pressure gas.

[0040] Optionally, the system further includes: a heat exchanger, wherein the high-temperature and high-pressure gas is divided into two parts; one part enters the thermoacoustic engine core to provide heat for the thermoacoustic engine core, and the other part enters the heat exchanger.

[0041] Optionally, the heat-driven thermoacoustic refrigerator includes: a thermoacoustic engine core, a thermoacoustic refrigerator core, and a resonance tube.

[0042] Optionally, a resonance tube connects the thermoacoustic refrigerator core and the thermoacoustic engine core to adjust the phase of the sound.

[0043] Optionally, the outlet end of the first-stage compressor is connected to the inlet end of the hot-end heat exchanger in the core of the thermoacoustic engine and the gas-side inlet end of the heat exchanger.

[0044] Optionally, the outlet end of the hot-end heat exchanger in the thermoacoustic engine core is connected to the inlet end of the cold-end heat exchanger in the thermoacoustic refrigerator core.

[0045] Optionally, the outlet end of the gas side of the heat exchanger is connected to the inlet end of the cold end heat exchanger in the core of the thermoacoustic refrigerator.

[0046] Optionally, the outlet end of the cold end heat exchanger in the core of the thermoacoustic refrigerator is connected to the inlet end of the next stage compressor.

[0047] In one embodiment, see Figure 1The present invention provides a compressor interstage cooling system, comprising: a first-stage compressor 1, a heat-driven thermoacoustic refrigerator 2, a heat exchanger 3, a circulating water reservoir 4, and a second-stage compressor 5. The heat-driven thermoacoustic refrigerator comprises: a thermoacoustic engine core 21, a thermoacoustic refrigerator core 23, and a resonance tube 22. Preferably, the heat-driven thermoacoustic refrigerator is composed of the thermoacoustic engine core 21, the thermoacoustic refrigerator core 23, and the resonance tube 22.

[0048] See also Figure 3 The core of the thermoacoustic engine is composed of 211, 212, and 213, wherein 211 is a room temperature end heat exchanger and 213 is a hot end heat exchanger. The room temperature end heat exchanger and the hot end heat exchanger cause a temperature difference in the regenerator 212, thereby generating sound waves. The core of the thermoacoustic refrigerator is composed of 231, 232, and 233, wherein 231 is a room temperature end heat exchanger and 233 is a cold end heat exchanger. 231 and 233 cause a temperature difference in the regenerator, so that the sound waves generated by the thermoacoustic engine consume energy in the regenerator 232 and generate cold in 233.

[0049] The resonance tube 22 connects the thermoacoustic refrigerator core 23 and the thermoacoustic engine core 21, and is used to adjust the phase of the acoustic work generated by the thermoacoustic engine. The resonance tube 22 connects the thermoacoustic refrigerator core 23 and the thermoacoustic engine core 21, and also has the function of adjusting the acoustic phase. The outlet end of the first-stage compressor 1 is connected to the inlet end of the hot-end heat exchanger in the thermoacoustic engine core 21 and the inlet end of the gas side of the heat exchanger 3. The outlet end of the hot-end heat exchanger in the thermoacoustic engine core 21 is connected to the inlet end of the cold-end heat exchanger in the thermoacoustic refrigerator core 23. The outlet end of the gas side of the heat exchanger 3 is connected to the inlet end of the cold-end heat exchanger in the thermoacoustic refrigerator core 23.

[0050] The outlet of the cold end heat exchanger in the thermoacoustic refrigerator core 23 is connected to the inlet of the secondary compressor 5. The inlet of the water side of the heat exchanger 3 is connected to the outlet of the circulating water reservoir 4. The outlet of the water side of the heat exchanger 3 is connected to the inlet of the circulating water reservoir 4.

[0051] In one embodiment, the present invention provides a compressor interstage cooling method, which applies heat-driven thermoacoustic refrigeration to the interstage cooling of the compressor, utilizes the high-temperature gas compressed by the compressor to drive the thermoacoustic refrigerator to generate cold through thermoacoustic effect, and uses the cold energy to cool the compressed gas, thereby enhancing the interstage cooling of the compressor.

[0052] In one embodiment, the present invention provides a compressor interstage cooling method, which uses heat-driven thermoacoustic refrigeration to reduce the exhaust temperature of each stage of the compressor. The method uses the thermoacoustic refrigeration effect to reduce the exhaust temperature of a multi-stage compressor.

[0053] In one embodiment, the present invention provides a compressor interstage cooling method, comprising:

[0054] Step 1: Compress the gas using a first-stage compressor and discharge the high-temperature and high-pressure gas; the discharged high-temperature and high-pressure gas is divided into two parts, one part enters the thermoacoustic engine core to provide heat for the thermoacoustic engine core, and the other part enters the heat exchanger;

[0055] Step 2, cooling the gas entering the heat exchanger to room temperature by water cooling;

[0056] Step 3: After heat exchange, the cooling water enters the circulating water reservoir for natural cooling;

[0057] Step 4: The gas entering the core of the thermoacoustic engine exchanges heat with the gas in the thermoacoustic engine through the hot-end heat exchanger inside the core of the thermoacoustic engine. The gas in the core of the thermoacoustic engine absorbs heat and heats up to start self-excited oscillation. The acoustic power generated by the oscillation is consumed by the plate stack inside the refrigerator through the phase modulation of the resonance tube and generates cooling capacity in the cold-end heat exchanger of the core of the thermoacoustic refrigerator.

[0058] Step 5: The compressed gas leaving the core of the thermoacoustic refrigerator and the gas cooled to room temperature by cooling water absorb cold energy in the cold end heat exchanger of the core of the thermoacoustic refrigerator, further reducing the exhaust temperature;

[0059] Step 6: The gas after the temperature is reduced enters the secondary compressor for compression. The working process after entering the secondary compressor is the same as the above process.

[0060] The compressor interstage cooling system described in the present invention has the following specific working process: the first-stage compressor compresses gas and discharges high-temperature and high-pressure gas; the discharged high-temperature and high-pressure gas is divided into two parts, one part enters the thermoacoustic engine core to provide heat for the thermoacoustic engine core, and the other part enters the heat exchanger; the gas entering the heat exchanger is cooled to room temperature by water. After heat exchange with cooling water, it enters the circulating water reservoir for natural cooling. The gas entering the thermoacoustic engine core exchanges heat with the gas in the thermoacoustic engine through the hot end heat exchanger inside the thermoacoustic engine core. The gas in the thermoacoustic engine core absorbs heat and heats up to start self-excited oscillation. The acoustic power generated by the oscillation is consumed by the plate stack inside the refrigerator through the phase modulation of the resonance tube and generates cold energy in the cold end heat exchanger of the thermoacoustic refrigerator core. The compressed gas leaving the thermoacoustic refrigerator core and the gas cooled to room temperature by cooling water absorb cold energy in the cold end heat exchanger of the thermoacoustic refrigerator core, further reducing the exhaust temperature. The gas with reduced temperature enters the second-stage compressor for compression, and the working process after entering the second-stage compressor is the same as the above process.

[0061] The heat-driven thermoacoustic refrigerator of the present invention generates cold energy after absorbing heat, and the cold energy is further used for inter-stage cooling of the compressor, thus realizing both the utilization of the exhaust waste heat of the compressor and the inter-stage cooling of the compressor.

[0062] In a preferred embodiment of the present invention, the compressor 1 is a screw compressor with a compression ratio of 3.5, an exhaust flow rate of 150 m³ / h, a maximum operating temperature of 400°C, a water-cooled cooling method, and an operating efficiency of about 80%. The compressor has an air inlet diameter of 50 mm and an exhaust port diameter of 40 mm.

[0063] In a preferred embodiment of the present invention, the thermoacoustic engine 21 is a traveling wave thermoacoustic engine.

[0064] In a preferred embodiment of the present invention, after being compressed by the compressor 1, the gas discharge temperature is 350° C., and after heat exchange in the hot end heat exchanger in the thermoacoustic engine core 21, the discharged gas temperature drops to 280° C. The thermoacoustic engine 21 is a traveling wave thermoacoustic engine, the operating frequency is 200 Hz, the temperature of the hot end heat exchanger 213 is 300° C., the temperature of the room temperature end heat exchanger 211 is 100° C., and the working fluid used is helium.

[0065] In a preferred embodiment of the present invention, the hot end heat exchanger 213 is a shell and tube heat exchanger made of aluminum alloy, with a tube density of 300 tubes per square meter, a tube diameter of 0.05 meters, a shell diameter of 2 meters, and a total length of 1 meter.

[0066] In a preferred embodiment of the present invention, the thermoacoustic refrigerator 23 is a traveling wave thermoacoustic refrigerator with a cooling capacity of 2 kW, a cold end temperature of -20°C, an operating frequency of 150 Hz, a coefficient of thermal efficiency (COP) of approximately 0.43, and helium as the coolant.

[0067] In a preferred embodiment of the present invention, the regenerators 212 and 232 are plate-stacked heat exchangers made of stainless steel, with an effective heat exchange area of ​​12 square meters, a thickness of 2 centimeters, a length and width of 1.2 meters respectively, and a plate spacing of 1.5 centimeters.

[0068] In a preferred embodiment of the present invention, the cold end heat exchanger 233 is a shell and tube heat exchanger with a tube density of 300 tubes per square meter, a tube diameter of 0.05 meters, a shell diameter of 2 meters, and a total length of 1 meter.

[0069] In a preferred embodiment of the present invention, the regenerators 212 and 232 are shell and tube heat exchangers made of aluminum alloy, with a tube density of 400 tubes per square meter, a tube diameter of 0.03 meters, a shell diameter of 2 meters, and a total length of 1 meter.

[0070] In a preferred embodiment of the present invention, referring to Figure 2 In order to ensure a certain amount of heat exchange, a water pump 5 is provided in the circulating water storage pipeline.

[0071] In a preferred embodiment of the present invention, the cooling water pump 5 used in the system has a flow rate of 5 cubic meters per hour and an operating pressure of 0.8 MPa, which ensures a stable cooling water flow rate of the hot end heat exchanger 213, thereby improving the heat exchange efficiency. In this process, the inlet temperature of the cooling water is 20°C, and the outlet temperature drops to 25°C after heat exchange.

[0072] In a preferred embodiment of the present invention, the circulating water reservoir 4 cools the gas from the first-stage compressor to 270 degrees Celsius.

[0073] In a preferred embodiment of the present invention, the gas cooled by the circulating water reservoir 4 is cooled by a thermoacoustic refrigerator for a second time, and the temperature is reduced to 260 degrees Celsius. The temperature of the gas cooled by the thermoacoustic refrigerator is lower than that of the gas not cooled by the thermoacoustic refrigerator, which is about 10 degrees Celsius lower.

[0074] In a preferred embodiment of the present invention, referring to Figure 2 , equipped with a solenoid valve 6, which is controlled by a control unit.

[0075] In a preferred embodiment of the present invention, referring to Figure 2 The whole system is equipped with a control unit 7, which can monitor the working status of each component in real time and adjust various parameters through the set PID control algorithm to ensure that the system operates under the best working conditions.

[0076] The present invention combines thermoacoustic cooling with water cooling for interstage cooling of compressors. Compared with the single water cooling method, thermoacoustic cooling can enhance the interstage cooling effect. In addition, the heat-driven thermoacoustic refrigerator is driven by the waste heat generated during the compression process of the compressor. Compared with directly discharging the waste heat to the environment, the method of absorbing and utilizing the waste heat has a certain value.

[0077] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0079] It should be understood by those skilled in the art that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A compressor interstage cooling system, characterized in that: Combining thermoacoustic cooling with water cooling for compressor interstage cooling to enhance interstage cooling; The system comprises at least a two-stage compressor and a heat-driven thermoacoustic refrigerator, wherein the first-stage compressor compresses gas and discharges high-temperature and high-pressure gas.

2. The system according to claim 1, characterized in that Preferably, the system further comprises: a heat exchanger, wherein the high temperature and high pressure gas is divided into two parts; one part enters the thermoacoustic engine core to provide heat for the thermoacoustic engine core, and the other part enters the heat exchanger.

3. The system according to claim 1, characterized in that The heat-driven thermoacoustic refrigerator comprises: a thermoacoustic engine core, a thermoacoustic refrigerator core, and a resonance tube.

4. The system according to claim 3, characterized in that The resonance tube connects the thermoacoustic refrigerator core and the thermoacoustic engine core and is used to adjust the phase of the sound.

5. The system according to claim 3, characterized in that The outlet end of the first-stage compressor is connected to the inlet end of the hot-end heat exchanger in the core of the thermoacoustic engine and the gas-side inlet end of the heat exchanger.

6. The system according to claim 3, characterized in that The outlet end of the hot end heat exchanger in the core of the thermoacoustic engine is connected to the inlet end of the cold end heat exchanger in the core of the thermoacoustic refrigerator.

7. The system according to claim 3, characterized in that The outlet end of the gas side of the heat exchanger is connected to the inlet end of the cold end heat exchanger in the core of the thermoacoustic refrigerator.

8. The system according to claim 3, characterized in that The outlet of the cold-end heat exchanger in the core of the thermoacoustic refrigerator is connected to the inlet of the next-stage compressor.

9. A compressor interstage cooling method, characterized in that: The method comprises: Step 1: Compress the gas using a first-stage compressor and discharge the high-temperature and high-pressure gas; the discharged high-temperature and high-pressure gas is divided into two parts, one part enters the thermoacoustic engine core to provide heat for the thermoacoustic engine core, and the other part enters the heat exchanger; Step 2, cooling the gas entering the heat exchanger to room temperature by water cooling; Step 3: After heat exchange, the cooling water enters the circulating water reservoir for natural cooling; Step 4: The gas entering the core of the thermoacoustic engine exchanges heat with the gas in the thermoacoustic engine through the hot-end heat exchanger inside the core of the thermoacoustic engine. The gas in the core of the thermoacoustic engine absorbs heat and heats up to start self-excited oscillation. The acoustic power generated by the oscillation is consumed by the plate stack inside the refrigerator through the phase modulation of the resonance tube and generates cooling capacity in the cold-end heat exchanger of the core of the thermoacoustic refrigerator. Step 5: The compressed gas leaving the core of the thermoacoustic refrigerator and the gas cooled to room temperature by cooling water absorb cold energy in the cold end heat exchanger of the core of the thermoacoustic refrigerator, further reducing the exhaust temperature; Step 6: The gas after the temperature is reduced enters the secondary compressor for compression. The working process after entering the secondary compressor is the same as the above process.

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