An adaptive refrigeration system

Abstract

The application relates to the technical field of new energy battery refrigeration systems, in particular to a self-adaptive refrigeration system which comprises a refrigeration system, a pump circulation system and a control system, wherein the refrigeration system comprises a condenser and at least one refrigeration module; the refrigeration module comprises a compressor, an electronic expansion valve and an intermediate heat exchanger; an expansion valve circuit for constant temperature adjustment of a refrigeration circuit is connected to each refrigeration module; the pump circulation system comprises a circulating tank, a pump, a control valve group, a first one-way valve, a load expansion valve, a second one-way valve and a terminal load; the self-adaptive refrigeration system can effectively respond to rapid temperature changes of a battery pack and control temperature changes of the load.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy battery refrigeration cooling system, in particular to a self-adaptive refrigeration system. BACKGROUND

[0002] At present, new energy battery packs are more and more widely used in energy storage due to their high energy density and long cycle life. A large amount of heat is generated during the charging and discharging process, so a fast and effective way is needed to dissipate heat from the battery pack to control the temperature of the battery pack within the safe setting range.

[0003] The cooling methods commonly used in the prior art are two kinds. One is to store the super-low temperature (such as-80℃) refrigerant oil or fluorinated liquid in the cold storage device, and then circulate it to the heat exchanger of the battery pack through the pump set for heat dissipation. This method belongs to sensible heat storage. The other is to use the battery pack as the evaporator of the refrigeration unit to dissipate heat, that is, to directly cool the battery pack by using the heat absorption characteristics of the phase change of the refrigerant.

[0004] However, in the process of dissipating heat from the battery pack by using the above two methods, both methods rely on flow control. The storage type refrigeration system needs to change the temperature of the medium in the entire storage tank when the battery needs to be cooled. After the temperature of the battery drops, the refrigeration system does not receive feedback in time and continues to work at the set refrigeration temperature, which cannot adjust in time according to the change of the heat generated by the battery during charging and discharging, resulting in waste of resources. The direct evaporation type refrigeration system needs a large amount of instantaneous refrigeration, which leads to a large amount of refrigerant being supplied to the circuit for battery cooling after the temperature of the battery drops, and the refrigeration system cannot respond to the change of the load temperature in time and adjust the system refrigeration. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the problem that the two refrigeration methods in the prior art cannot quickly respond to the rapid change of the temperature of the battery pack and adjust the refrigeration system in time. A self-adaptive refrigeration system is provided to adjust the refrigeration system in time when the temperature of the battery changes too fast.

[0006] A self-adaptive refrigeration system is provided for the present application, comprising:

[0007] A refrigeration system comprises a condenser and at least one refrigeration module, the refrigeration module comprising a compressor, an electronic expansion valve and an intermediate heat exchanger, the condenser being connected in sequence with the compressor, the intermediate heat exchanger and the electronic expansion valve through pipelines to form a refrigeration circuit, and each refrigeration module being connected with an expansion valve circuit for constant temperature regulation of the refrigeration circuit, the expansion valve circuit comprising a constant temperature control expansion valve connected with the compressor outlet and the intermediate heat exchanger through connecting pipelines.

[0008] A pump circulation system comprises a circulation tank, a pump, a control valve group, a first one-way valve and a load expansion valve, the circulation tank, the pump, the control valve group, the first one-way valve and the load expansion valve being connected in sequence with the intermediate heat exchanger through pipelines to form a pump liquid circulation circuit, and further comprising a second one-way valve and a terminal load, the circulation tank, the pump, the control valve group, the second one-way valve, the terminal load and the intermediate heat exchanger being connected in sequence through pipelines to form a load circuit.

[0009] When the refrigeration circuit and the load circuit are in operation and the pump liquid circulation circuit is disconnected, the adaptive refrigeration system is in a first cooling supply state; when the refrigeration circuit, the load circuit and the pump liquid circulation circuit are all in operation, the adaptive refrigeration system is in a second cooling supply state; when the refrigeration circuit and the pump liquid circulation circuit are in operation and the load circuit is disconnected, the adaptive refrigeration system is in a cold storage state; when the cold storage is completed in the cold storage state, the expansion valve circuit is in operation, and the adaptive refrigeration system is in a constant temperature state.

[0010] A control system is used to control the first cooling supply state, the second cooling supply state, the cold storage state and the constant temperature state of the adaptive refrigeration system.

[0011] In an embodiment of the present application, the control system comprises:

[0012] An input module is used for man-machine interactive parameter input.

[0013] A plurality of sensor modules are used for temperature and pressure signal collection of the refrigeration end and the load end and signal collection of the liquid level of the circulation tank.

[0014] A PID control module controls the system by collecting electronic signals of the plurality of sensor modules and outputting control signals to control the operating power of the compressor, the opening degree of the electronic expansion valve, the opening degree of the load expansion valve and the operating power of the pump to ensure temperature control accuracy.

[0015] In an embodiment of the present application, the sensor module should be provided with at least three groups, which are:

[0016] A primary sensor module comprises a first pressure sensor and a first temperature sensor, which are used to measure the fluid pressure and temperature of the intermediate heat exchanger flowing back to the compressor.

[0017] A second sensor module, comprising a second pressure sensor and a second temperature sensor, is used to measure the pressure and temperature of the refrigerant flowing out of the outlet of the circulation tank;

[0018] A terminal sensor module, comprising a third temperature sensor used to measure the temperature of the terminal load and a liquid level sensor used to measure the liquid level of the circulation tank.

[0019] In an embodiment of the present application, the signal acquisition end of the PID control module is connected to the electronic signal output end of the first pressure sensor, the first temperature sensor, the second pressure sensor, the second temperature sensor, the third temperature sensor and the liquid level sensor, respectively, wherein:

[0020] The data of the first pressure sensor and the first temperature sensor are used as a reference to adjust the opening degree of the electronic expansion valve, so that the evaporation temperature of the refrigerant gas is lower than the actual suction temperature of the compressor;

[0021] The second pressure sensor is used as a reference to adjust the opening degree of the load expansion valve, and the second temperature sensor is used to measure the outlet temperature of the circulation tank;

[0022] The third temperature sensor is used to measure the temperature of the terminal load;

[0023] The liquid level sensor is used to monitor the liquid level in the circulation tank.

[0024] In an embodiment of the present application, the control signal is output according to the collected signals to regulate the operation of the compressor, the pump, the control valve group, the electronic expansion valve, the load expansion valve and the thermostatic control expansion valve, wherein:

[0025] In the first cooling state, the outlet temperature of the circulation tank is detected by the second temperature sensor to determine whether it reaches the set value, and the temperature of the terminal load is collected by the third temperature sensor. If the temperature of the terminal load increases, the compressor continues to cool, and the frequency of the pump operation is adjusted according to the change of the temperature of the terminal load to maintain the balance between the cooling capacity and the heat generated by the terminal load;

[0026] In the second cooling state, the temperature of the terminal load is collected by the third temperature sensor, and the flow distribution of the refrigerant is controlled by the control valve group according to the change of the temperature of the terminal load, and the distribution amount of the refrigerant in the load circuit and the pump liquid circulation circuit is adjusted according to the change of the temperature of the terminal load;

[0027] In the cold storage state, the outlet pressure of the circulation tank is detected by the second pressure sensor, the opening degree of the load expansion valve is adjusted according to the pressure at the outlet of the circulation tank, and the operating frequency of the compressor is regulated according to the temperature at the outlet of the circulation tank to maintain the continuous cooling of the refrigerant in the pump liquid circulation circuit;

[0028] When the compressor runs at the lowest set speed in the constant temperature state, the second temperature sensor detects the circulating tank outlet temperature, and if the temperature continuously decreases and is lower than the set value, the control intervention of the expansion valve is performed, and part of the high-temperature and high-pressure refrigerant gas from the compressor outlet is introduced into the intermediate heat exchanger through the expansion valve circuit, so that the evaporation pressure of the intermediate heat exchanger is increased to ensure the temperature in the circulating tank.

[0029] In an embodiment of the present application, the refrigeration module is a two-stage refrigeration, comprising:

[0030] A first-stage refrigeration module comprising a first compressor, a first electronic expansion valve and a first intermediate heat exchanger, a condenser connected with the first compressor, the first electronic expansion valve and the first intermediate heat exchanger through pipelines to form a first-stage refrigeration circuit, and a first thermostatic control expansion valve connected between the corresponding first compressor outlet end and the first intermediate heat exchanger;

[0031] A second-stage refrigeration module comprising a second compressor, a second electronic expansion valve and a second intermediate heat exchanger, the first intermediate heat exchanger connected with the second compressor, the second electronic expansion valve and the second intermediate heat exchanger through pipelines to form a second-stage refrigeration circuit, and a second thermostatic control expansion valve connected between the corresponding second compressor outlet end and the second intermediate heat exchanger;

[0032] The first-stage refrigeration circuit circulates the refrigerant in the circuit to exchange heat with the refrigerant in the second-stage refrigeration circuit through the first intermediate heat exchanger, so as to provide pre-cooling for the second-stage refrigeration circuit.

[0033] The first-stage refrigeration module and the second-stage refrigeration module are both connected with a drying filter for drying.

[0034] In an embodiment of the present application, the drying filter should include a first drying filter connected between the condenser outlet and the first electronic expansion valve inlet, and a second drying filter connected between the second compressor outlet and the first intermediate heat exchanger, and the second compressor exhaust end is further connected with an oil separator, and the outlet end of the oil separator is connected with the inlet end of the second drying filter.

[0035] In an embodiment of the present application, the circulating tank comprises a tank body and a gas-liquid separation structure,

[0036] The gas-liquid separation structure comprises an impact disc rotatably installed in the tank body, and a driving structure installed on the tank body, the impact disc is installed on the power output end of the driving structure and rotates with the driving structure, and a conical flow guide block is installed on the base surface of the impact disc corresponding to the tank inlet.

[0037] In an embodiment of the present application, in addition, a secondary turbulence cover is fixedly installed on the inner wall of the tank inlet.

[0038] In one embodiment of the present application, a first annular defoaming screen is installed between the lower end of the secondary spoiler and the inner side wall of the tank body, and a second annular defoaming screen is installed on the inner side wall of the tank body below the impact disc.

[0039] The above technical solution of the present application has the following advantages compared with the prior art:

[0040] The compressor and the pump are controlled to start, the refrigerant in the refrigeration circuit is cooled by the compressor, and then exchanges heat with the refrigerant in the pump liquid circulation circuit in the intermediate heat exchanger, and through the characteristics of little change in phase change temperature at the end, the refrigerant in the pump liquid circulation circuit is cooled and circulated in the circuit, if the cold storage is stored in the circulating tank, if the cooling is supplied, the refrigerant in the circulating tank is output to the load circuit through the pump to cool the end load, and the self-adaptive refrigeration system in the load circuit can effectively respond to the heat change generated by the battery charging and discharging, and the state of the refrigeration system is controlled by the control system according to the cooling condition of the end load, that is, the running state of the compressor and the pump, the opening degree of the electronic expansion valve and the constant temperature control expansion valve are adjusted to control the refrigeration circuit and the pump liquid circulation circuit, so that the end load temperature change can be controlled in time and effectively, and the temperature is kept stable while avoiding resource waste. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to make the content of the present application more easily understood, the present application will be further described in detail below according to specific embodiments of the present application and in conjunction with the drawings, wherein,

[0042] Figure 1 is a system principle diagram of the present application;

[0043] Figure 2 is a system principle diagram of another embodiment of the present application;

[0044] Figure 3 is an external structure diagram of the circulating tank of the present application;

[0045] Figure 4 is a cross-sectional structure diagram of the circulating tank of the present application;

[0046] Figure 5 is an internal structure diagram of the circulating tank of the present application.

[0047] The description of the drawings is as follows: 1, condenser; 2, compressor; 2a, first compressor; 2b, second compressor; 3, electronic expansion valve; 3a, first electronic expansion valve; 3b, second electronic expansion valve; 4, intermediate heat exchanger; 4a, first intermediate heat exchanger; 4b, second intermediate heat exchanger; 5, thermostatic expansion valve; 5a, first thermostatic expansion valve; 5b, second thermostatic expansion valve; 6a, first dry filter; 6b, second dry filter; 7, oil separator; 8, circulating tank; 81, tank body; 821, impact disc; 822, driving structure; 823, conical guide block; 83, secondary spoiler; 84, first annular demisting screen; 85, second annular demisting screen; 9, pump; 10, control valve group; 11, first one-way valve; 12, load expansion valve; 13, second one-way valve; 14, terminal load; 15, input module; 161, first pressure sensor; 162, first temperature sensor; 163, second pressure sensor; 164, second temperature sensor; 165, third temperature sensor; 166, liquid level sensor; 17, PID control module. DETAILED DESCRIPTION

[0048] The present application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it, but the embodiments are not limiting to the present application.

[0049] Reference Figure 1 The present application is an adaptive refrigeration system, comprising:

[0050] The refrigeration system comprises a condenser 1 and at least one refrigeration module, the refrigeration module comprising a compressor 2, an electronic expansion valve 3 and an intermediate heat exchanger 4, the condenser 1 is connected with the compressor 2, the intermediate heat exchanger 4 and the electronic expansion valve 3 in sequence through connecting pipelines to form a closed refrigeration circuit, the refrigerant flow path of the refrigeration circuit is that the compressor 2 operates to compress the refrigerant into high-temperature and high-pressure refrigerant gas, the gaseous refrigerant enters the condenser 1 to become supercooled liquid through heat dissipation, and then enters the intermediate heat exchanger 4 after being cooled and decompressed by the electronic expansion valve 3 to exchange heat and then flows back to the compressor 2 to complete a refrigeration and heat exchange cycle; and each refrigeration module is connected with an expansion valve circuit for constant temperature adjustment of the refrigeration circuit, the expansion valve circuit comprises a thermostatic expansion valve 5, which is connected between the outlet of the compressor 2 and the intermediate heat exchanger 4 through connecting pipelines, the expansion valve circuit is another passage for the high-temperature and high-pressure refrigerant gas in the compressor 2, the passage is connected with the intermediate heat exchanger 4, which can control the temperature of the refrigerant passing through the intermediate heat exchanger 4 to realize constant temperature control of the heat exchange process;

[0051] A pump circulation system, which comprises a circulation tank 8, a pump 9, a control valve group 10, a first one-way valve 11, and a load expansion valve 12. The control valve group 10 is two independent electromagnetic valves that control the access state of the pump liquid circulation loop and the load circuit respectively. Specifically, a three-way joint should be installed on the main connecting pipeline to connect the two independent electromagnetic valves. The circulation tank 8, the pump 9, the control valve group 10, the first one-way valve 11, and the load expansion valve 12 are sequentially connected through pipelines to form a pump liquid circulation loop. The flow path of the refrigerant in the pump liquid circulation loop is as follows: the refrigerant is stored in the circulation tank 8, is pressurized by the pump 9, is sent to the control valve group 10, enters the load expansion valve 12 after the first one-way valve 11, is throttled and depressurized, and then enters the intermediate heat exchanger 4 for heat exchange and cooling, and is liquefied and returned to the circulation tank 8. The system further comprises a second one-way valve 13 and an end load 14. The circulation tank 8, the pump 9, the control valve group 10, the second one-way valve 13, the end load 14, and the intermediate heat exchanger 4 are sequentially connected through pipelines to form a load circuit. When the load circuit is connected through the control valve group 10, the pump 9 can directly deliver the refrigerant in the circulation tank 8 to the end load 14 for cooling treatment.

[0052] When the refrigeration circuit and the load circuit are in operation and the pump liquid circulation loop is disconnected, the adaptive refrigeration system is in a first cooling supply state, i.e., the compressor 2 is started, the pump 9 is started, the opening degree of the electronic expansion valve 3 is adjusted, the refrigeration circuit starts to cool, and the control valve group 10 controls the refrigerant to flow to the load circuit for cooling the load. When the refrigeration circuit, the load circuit, and the pump liquid circulation loop are all in operation, the adaptive refrigeration system is in a second cooling supply state, i.e., the control valve group 10 controls the refrigerant to flow to the load circuit and the pump liquid circulation loop, respectively, and adjusts the flow distribution according to the change of the load temperature. When the refrigeration circuit and the pump liquid circulation loop are in operation and the load circuit is disconnected, the adaptive refrigeration system is in a cold storage state, i.e., the control valve group 10 controls the refrigerant to flow to the load expansion valve 12 in the pump liquid circulation loop, so that the refrigerant in the loop exchanges heat with the refrigerant in the refrigeration circuit to complete the cold storage in the circulation tank 8. When the cold storage is completed in the cold storage state, the adaptive refrigeration system is in a constant temperature state, i.e., the refrigerant in the circulation tank 8 reaches the cold storage temperature, and the expansion valve circuit is connected to keep the temperature of the refrigerant in the circulation tank 8 constant.

[0053] A control system for regulating the first cooling supply state, the second cooling supply state, the cold storage state, and the constant temperature state of the adaptive refrigeration system.

[0054] Compared with the prior art, the self-adaptive refrigeration system can directly supply cold to quickly reduce the temperature of the terminal load 14 when the terminal load 14 is connected, and can store cold for use when the terminal load 14 is not connected. It is to be noted that the first one-way valve 11 in the pump liquid circulation loop and the second one-way valve 13 in the load loop have anti-backflow functions, so that the pump liquid circulation loop and the load loop can be separately operated under the control of the control valve group 10, that is, the storage and cooling modes are separated, and the storage and cooling can be simultaneously performed. The specific operation process is as follows: after the control system controls the compressor 2 and the pump 9 to start, the refrigerant in the refrigeration circuit is cooled and cooled by the compressor 2, and then exchanges heat with the refrigerant in the pump liquid circulation loop in the intermediate heat exchanger 4. Due to the small change in the phase change temperature of the refrigerant, the refrigerant in the pump liquid circulation loop is cooled and circulated in the loop. If the refrigerant is stored in the circulating tank 8, if the refrigerant is cooled, the refrigerant in the circulating tank 8 is output to the load loop through the pump 9 to cool the terminal load 14, so that the self-adaptive refrigeration system of the terminal load 14 in the load loop can timely and effectively respond to the heat change generated by the battery charging and discharging. At the same time, according to the load cooling condition, the state is switched by the control system, that is, the running state of the compressor 2 and the pump 9 is adjusted, the opening degree of the electronic expansion valve 3 and the constant temperature control expansion valve 5 is adjusted to control the refrigeration circuit and the pump liquid circulation loop, so that the temperature change of the terminal load 14 can be timely and effectively controlled, and the temperature of the terminal load 14 can be kept stable.

[0055] As shown in Figure 1 , the control system comprises an input module 15, specifically an integrated display screen for man-machine interaction parameter input;

[0056] A plurality of sensor modules are used for temperature and pressure signal acquisition of the refrigeration end and the load end, and signal acquisition of the liquid level of the circulating tank 8;

[0057] A PID control module 17 controls the running power of the compressor 2, the opening degree of the electronic expansion valve 3, the opening degree of the load expansion valve 12, and the running power of the pump 9 to control the system and ensure the temperature control accuracy;

[0058] The sensor module should have at least three groups, which are:

[0059] A first sensor module includes a first pressure sensor 161 and a first temperature sensor 162, which are used to measure the fluid pressure and temperature of the intermediate heat exchanger 4 flowing back to the compressor 2;

[0060] The secondary sensor module includes a second pressure sensor 163 and a second temperature sensor 164 for measuring the pressure and temperature of the refrigerant flowing out of the circulation tank 8;

[0061] The end sensor module includes a third temperature sensor 165 for measuring the end load 14 and a liquid level sensor 166 for measuring the liquid level of the circulation tank 8;

[0062] The signal collection end of the PID control module 17 is connected to the electronic signal output ends of the first pressure sensor 161, the first temperature sensor 162, the second pressure sensor 163, the second temperature sensor 164, the third temperature sensor 165, and the liquid level sensor 166, and outputs control signals according to the collected signals for regulating the operation of the compressor 2, the pump 9, the electronic expansion valve 3, the load expansion valve 12, and the thermostatic control expansion valve 5, wherein the opening degree of the load expansion valve 12 is adjusted according to the outlet pressure value of the circulation tank 8;

[0063] The PID control module 17 compares and analyzes the electronic signals of the first pressure sensor 161, the first temperature sensor 162, the second pressure sensor 163, the second temperature sensor 164, the third temperature sensor 165, and the liquid level sensor 166 with the system set values. Here, it is necessary to say that the data of the first pressure sensor 161 and the first temperature sensor 162 are used as references for adjusting the opening degree of the electronic expansion valve 3, so that the evaporation temperature of the refrigerant gas is lower than the actual suction temperature of the compressor 2. The second pressure sensor 163 is used as a reference for adjusting the opening degree of the load expansion valve 12. The second temperature sensor 164 is used for measuring the outlet temperature of the circulation tank 8. The third temperature sensor 165 is used for measuring the temperature of the end load 14. The liquid level sensor 166 is used for monitoring the liquid level in the circulation tank 8. The liquid level value data is set according to the actual situation, and then control signals are output according to the collected signals for regulating the operation of the compressor 2, the pump 9, the control valve group 10, the electronic expansion valve 3, the load expansion valve 12, and the thermostatic control expansion valve 5. The specific regulation is based on:

[0064] In the first cooling state, the second temperature sensor 164 detects whether the outlet temperature of the circulation tank 8 reaches the set value, and the third temperature sensor 165 collects the temperature of the end load 14. If the temperature of the end load 14 increases, the compressor 2 continues to cool. The frequency of the pump 9 is adjusted according to the change of the temperature of the end load 14, so that the cooling capacity and the heat generated by the end load 14 remain balanced.

[0065] In the second cooling state, the flow distribution of the refrigerant is controlled by the control valve group 10 according to the change of the temperature of the end load 14. If the temperature of the end load 14 increases, more refrigerant is distributed to the load circuit. If the temperature of the end load 14 decreases, more refrigerant is distributed to the pump liquid circulation circuit.

[0066] In the cold storage state, the opening of the load expansion valve 12 is adjusted according to the pressure at the outlet of the circulation tank 8, and the operating frequency of the compressor 2 is regulated according to the temperature at the outlet of the circulation tank 8;

[0067] In the constant temperature state, when the operating speed of the compressor 2 reaches the minimum setting, the expansion valve circuit is intervened according to the outlet temperature of the circulation tank 8 detected by the second temperature sensor 164, and if the outlet temperature continuously decreases below the setting value, part of the high-temperature and high-pressure refrigerant gas from the outlet of the compressor 2 is introduced into the intermediate heat exchanger 4 through the expansion valve circuit, so as to increase the evaporation pressure of the intermediate heat exchanger, thereby ensuring the temperature in the circulation tank.

[0068] As shown in Figure 2 , the refrigeration module is a two-stage refrigeration module, which comprises:

[0069] a first-stage refrigeration module, which comprises a first compressor 2a, a first electronic expansion valve 3a, and a first intermediate heat exchanger 4a, the condenser 1 is connected with the first compressor 2a, the first electronic expansion valve 3a, and the first intermediate heat exchanger 4a through pipelines to form a first-stage refrigeration circuit, and a first constant temperature control expansion valve 5a is connected between the corresponding outlet end of the first compressor 2a and the first intermediate heat exchanger 4a, which is used to deliver part of the high-temperature and high-pressure gas from the first compressor 2a to the first intermediate heat exchanger 4a when it is necessary to maintain the temperature, so as to keep the temperature constant on this side;

[0070] a second-stage refrigeration module, which comprises a second compressor 2b, a second electronic expansion valve 3b, and a second intermediate heat exchanger 4b, the first intermediate heat exchanger 4a is connected with the second compressor 2b, the second electronic expansion valve 3b, and the second intermediate heat exchanger 4b through pipelines to form a second-stage refrigeration circuit, and a second constant temperature control expansion valve 5b is connected between the corresponding outlet end of the second compressor 2b and the second intermediate heat exchanger 4b, which is used to deliver part of the high-temperature and high-pressure gas from the second compressor 2b to the second intermediate heat exchanger 4b when it is necessary to maintain the temperature, so as to keep the temperature constant on this side and provide a stable heat exchange temperature for one side of the pump liquid circulation circuit;

[0071] The refrigerant in the first-stage refrigeration circuit is subjected to a refrigeration cycle, exchanges heat with the refrigerant in the second-stage refrigeration circuit through the first intermediate heat exchanger 4a, and is used to provide pre-cooling for the second-stage refrigeration circuit, wherein the lowest temperature that can be reached by the refrigerant in the second-stage refrigeration circuit is different from that of the refrigeration circuit, so that the refrigeration efficiency of the second-stage refrigeration circuit is improved, and the second-stage refrigeration circuit can reach a lower refrigeration temperature;

[0072] When starting, the primary refrigeration circuit is started preferentially, and the secondary refrigeration circuit is started after a delay. The refrigerant in the primary refrigeration circuit is compressed into high-temperature and high-pressure refrigerant gas, and then enters the condenser 1. The condenser 1 can be air-cooled or water-cooled. The refrigerant is cooled by the condenser 1 and becomes a supercooled state, enters the first electronic expansion valve 3a, is throttled, decompressed, and cooled, and then enters the first intermediate heat exchanger 4a and exchanges heat with the refrigerant in the secondary refrigeration circuit. After absorbing heat, the refrigerant returns to the first compressor 2a.

[0073] The secondary refrigeration circuit is started after a delay. The second compressor 2b is started, and the refrigerant in the secondary refrigeration circuit is compressed into high-temperature and high-pressure refrigerant gas, enters the first intermediate heat exchanger 4a for heat exchange, and becomes a cold liquid after condensation. The refrigerant is throttled, decompressed, and cooled by the second electronic expansion valve 3b, and becomes low-temperature gas-liquid two-phase refrigerant, and enters the second intermediate heat exchanger 4b to wait for heat exchange with the refrigerant on the pump 9 circulation side.

[0074] The pump 9 is started, and the refrigerant in the circulation tank 8 is pressurized and sent out. The refrigerant is supplied according to different connection paths, and then enters the circulation tank 8 after heat exchange and cooling treatment by the second intermediate heat exchanger 4b to complete the circulation.

[0075] As shown in Figure 2 , the primary refrigeration module and the secondary refrigeration module are both connected with a drying filter for drying, so as to remove the moisture generated by refrigeration in the primary refrigeration circuit and the secondary refrigeration circuit.

[0076] The drying filter should include a first drying filter 6a connected between the outlet of the condenser 1 and the inlet of the first electronic expansion valve 3a, and a second drying filter 6b connected between the outlet of the second compressor 2b and the first intermediate heat exchanger 4a. In addition, the second compressor 2b is also connected with an oil separator 7. The outlet end of the oil separator 7 is connected with the inlet end of the second drying filter 6b. The oil separator 7 separates the lubricating oil and the refrigerant inside it, so that the lubricating oil flows back to the second compressor 2b, and the refrigerant flows along the circuit, thereby reducing the influence of the lubricating oil on the refrigerant.

[0077] As shown in Figure 3 , 4 , the refrigerant entering the circulation tank 8 is in a liquid state and a gas-liquid two-phase state. The flow path inside the circulation tank 8 is optimized for two-phase separation to prevent cavitation. Preferably, the circulation tank 8 includes a tank body 81 and a gas-liquid separation structure.

[0078] The gas-liquid separation structure includes an impact disc 821 rotatably installed inside the tank 81. The base surface of the impact disc 821 corresponds directly below the air inlet of the tank 81, serving to mitigate the impact of liquefied refrigerant entering the tank 81. It also allows for effective separation of any partially liquefied gas-liquid two-phase refrigerant entering the tank 81 after passing through the impact disc 821. A drive structure 822 is installed on the tank 81 to rotate the impact disc 821, thereby generating centrifugal force that allows any residual refrigerant on the base surface of the impact disc 821 to be quickly ejected into the tank. The inner wall of the tank 81 allows the refrigerant to slowly slide down the inner wall of the tank 81 to the bottom of the tank 81. The impact disc 821 is installed at the power output end of the drive structure 822 and rotates with it. A conical guide block 823 is installed on the upper base surface of the impact disc 821 corresponding to the air inlet of the tank 81. Here, the conical guide block 823 is fixedly installed at the rotation center of the upper base surface of the impact disc 821, that is, directly below the air inlet, and uses the cone to change the flow direction of the incoming substance, so as to further reduce the impact of refrigerant in various states entering the tank 81.

[0079] Compared to the existing technology of installing tangential guide plates and impact baffles at the inlet of tank 81, the advantage of this invention is that it can quickly throw the separated refrigerant liquid to the inner wall of tank 81 so that it flows down along the inner wall of tank 81. This effectively avoids the impact of high-speed entry into tank 81 on the liquid surface remaining on the impact disc 821, which would cause splashing and thus avoid the generation of bubbles. In addition, it prevents bubbles from entering the pump body when the pump 9 is working, causing cavitation and damaging the pump body.

[0080] like Figure 4 , 5 As shown, a secondary turret 83 is fixedly installed on the inner wall of the air inlet of the tank 81. It expands from top to bottom in a trumpet shape and works in conjunction with the conical guide block 823. There is a gap between the two to ensure that the refrigerant of various states entering can be further slowed down by the secondary turret 83 above after being slowed down by the impact disk 821.

[0081] like Figure 4 As shown, a first annular demister mesh 84 is installed between the lower end of the secondary turbulence shroud 83 and the inner wall of the tank body 81. The corresponding inner wall of the tank body 81 and the lower end of the secondary turbulence shroud 83 are provided with mounting bosses for installing the first annular demister mesh 84. A second annular demister mesh 85 is installed on the inner wall of the tank body 81 below the impact disc 821. After the impact is mitigated, the refrigerant is blocked by the first annular demister mesh 84 and the second annular demister mesh 85, respectively, further reducing the small microbubbles mixed in the refrigerant.

[0082] like Figure 4As shown, the tank body 81 is specifically composed of an upper tank cover and a lower tank body, and the upper tank cover and the lower tank body are sealingly connected at the connection part. The internal cavity is composed of an upper impact alleviating cavity and a lower liquid storage cavity. The liquid level sensor 166 is arranged at a corresponding height of the lower tank body liquid storage cavity. The upper impact alleviating cavity has a larger diameter than the lower liquid storage cavity. The impact disc 821 is installed in the upper impact alleviating cavity. The upper tank cover is provided with an air inlet communicated with the intermediate heat exchanger 4. The bottom of the lower tank body is provided with a liquid outlet communicated with the pump 9. The driving structure 822 is specifically a transmission shaft installed in the lower tank body for supporting the rotation of the impact disc 821 and is drivingly connected to an external driving device. Correspondingly, the lower tank body is provided with a mounting hole and a mechanical shaft seal corresponding thereto, so as to ensure the sealing performance and the operation stability of the circulating tank 8. In addition, if there are two stages of refrigeration, the circulating tank 8 is connected with the second intermediate heat exchanger 4b.

[0083] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. An adaptive cooling system, characterized in that, include: A refrigeration system includes a condenser and at least one refrigeration module. The refrigeration module includes a compressor, an electronic expansion valve, and an intermediate heat exchanger. The condenser, compressor, intermediate heat exchanger, and electronic expansion valve are sequentially connected via pipelines to form a refrigeration circuit. Each stage of the refrigeration module is connected to an expansion valve circuit for constant temperature regulation of the refrigeration circuit. The expansion valve circuit includes a thermostatic control expansion valve, which is connected to the compressor outlet and the intermediate heat exchanger via connecting pipelines. A pump circulation system includes a circulation tank, a pump, a control valve assembly, a first check valve, and a load expansion valve. The circulation tank, the pump, the control valve assembly, the first check valve, and the load expansion valve are sequentially connected to the intermediate heat exchanger via pipelines to form a pump liquid circulation loop. The system also includes a second check valve and a terminal load. The circulation tank, the pump, the control valve assembly, the second check valve, the terminal load, and the intermediate heat exchanger are sequentially connected via pipelines to form a load loop. Specifically: when the refrigeration circuit and load circuit are engaged and the pump-liquid circulation circuit is disconnected, the adaptive refrigeration system is in the first cooling state; when the refrigeration circuit, load circuit, and pump-liquid circulation circuit are all engaged and operating, the adaptive refrigeration system is in the second cooling state; when the refrigeration circuit and pump-liquid circulation circuit are engaged and operating, and the load circuit is disconnected, the adaptive refrigeration system is in the cold storage state; when the cold storage state is completed, the expansion valve circuit is engaged and operating, and the adaptive refrigeration system is in the constant temperature state. The control system is used to regulate the first cooling state, the second cooling state, the cold storage state, and the constant temperature state of the adaptive refrigeration system.

2. The adaptive cooling system according to claim 1, characterized in that: The control system includes: The input module is used for inputting parameters for human-computer interaction. Multiple sensor modules are used for acquiring temperature and pressure signals at the cooling end and the load end, as well as for acquiring liquid level signals in the circulating tank. The PID control module controls the compressor's operating power, the electronic expansion valve's opening, the load expansion valve's opening, and the pump's operating power by collecting electronic signals from multiple sets of sensor modules and outputting control signals to ensure accurate temperature control.

3. The adaptive cooling system according to claim 2, characterized in that: The sensor module should have at least three sets, namely: The primary sensor module includes a first pressure sensor and a first temperature sensor, used to measure the pressure and temperature of the fluid returning from the intermediate heat exchanger to the compressor; The secondary sensor module includes a second pressure sensor and a second temperature sensor, used to measure the pressure and temperature of the refrigerant flowing out of the outlet of the circulating tank; The end sensor module includes a third temperature sensor for measuring the end load and a level sensor for measuring the liquid level in the circulation tank.

4. The adaptive cooling system according to claim 3, characterized in that: The signal acquisition terminal of the PID control module is respectively connected to the electronic signal output terminals of the first pressure sensor, the first temperature sensor, the second pressure sensor, the second temperature sensor, the third temperature sensor, and the liquid level sensor, wherein: The data from the first pressure sensor and the first temperature sensor are used as a reference to adjust the opening of the electronic expansion valve so that the evaporation temperature of the refrigerant gas is lower than the actual suction temperature of the compressor. The second pressure sensor is used as a reference for adjusting the opening of the load expansion valve, and the second temperature sensor is used to measure the outlet temperature of the circulation tank; The third temperature sensor is used to measure the temperature of the end load; The liquid level sensor is used for monitoring the liquid level inside the circulating tank.

5. An adaptive cooling system according to claim 3, characterized in that: Based on the acquired signals, control signals are output to regulate the operation of the compressor, the pump, the control valve group, the electronic expansion valve, the load expansion valve, and the thermostatic control expansion valve, wherein: In the first cooling state, the second temperature sensor detects whether the outlet temperature of the circulation tank reaches the set value, and the third temperature sensor collects the end load temperature. If the end load temperature increases, the compressor continues to cool. The pump operating frequency is adjusted according to the change of the end load temperature to maintain a balance between the cooling capacity and the heat generated by the end load. In the second cooling state, the terminal load temperature is collected by the third temperature sensor. Based on the change of the terminal load temperature, the refrigerant flow distribution is controlled by the control valve group. Based on the change of the terminal load temperature, the refrigerant distribution in the load circuit and the pump liquid circulation circuit is adjusted. In the cold storage state, the second pressure sensor detects the outlet pressure of the circulation tank, adjusts the opening of the load expansion valve according to the pressure at the outlet of the circulation tank, and regulates the operating frequency of the compressor according to the temperature at the outlet of the circulation tank detected by the second temperature sensor, so as to maintain the continuous cooling of the refrigerant in the pump liquid circulation loop. Under constant temperature conditions, when the compressor operating speed reaches the minimum setting, if the outlet temperature of the circulation tank detected by the second temperature sensor continues to drop below the set value, the expansion valve circuit is controlled to intervene, and a portion of high-temperature and high-pressure refrigerant gas is introduced from the compressor outlet through the expansion valve circuit to the intermediate heat exchanger to increase the evaporation pressure of the intermediate heat exchanger, so as to ensure the temperature inside the circulation tank.

6. An adaptive cooling system according to any one of claims 1-5, characterized in that: The cooling module is a two-stage cooling system, including: A primary refrigeration module includes a first compressor, a first electronic expansion valve, and a first intermediate heat exchanger. The condenser is connected to the first compressor, the first electronic expansion valve, and the first intermediate heat exchanger through a pipeline to form a primary refrigeration circuit. A first thermostatic control expansion valve is connected between the outlet end of the first compressor and the first intermediate heat exchanger. The secondary refrigeration module includes a second compressor, a second electronic expansion valve, and a second intermediate heat exchanger. The first intermediate heat exchanger is connected to the second compressor, the second electronic expansion valve, and the second intermediate heat exchanger through a pipeline to form a secondary refrigeration circuit. A second thermostatic control expansion valve is connected between the outlet end of the second compressor and the second intermediate heat exchanger. The primary refrigeration circuit refrigerates the refrigerant in the circuit. The refrigerant exchanges heat with the refrigerant in the secondary refrigeration circuit via the first intermediate heat exchanger, which is used to provide pre-cooling for the secondary refrigeration circuit. Both the primary refrigeration module and the secondary refrigeration module are connected to a drying filter for drying.

7. An adaptive cooling system according to claim 6, characterized in that: The dryer filter should include a first dryer filter connected between the condenser outlet and the inlet of the first electronic expansion valve, and a second dryer filter connected between the second compressor outlet and the first intermediate heat exchanger. The discharge end of the second compressor is also connected to an oil separator, and the outlet end of the oil separator is connected to the inlet end of the second dryer filter.

8. The adaptive cooling system according to claim 1, characterized in that: The circulating tank includes a tank body and a gas-liquid separation structure, wherein: The gas-liquid separation structure includes an impact disk rotatably installed inside the tank, a corresponding drive structure installed on the tank, the impact disk being installed at the power output end of the drive structure and rotating with it, and a conical guide block being installed on the base surface of the impact disk corresponding to the air inlet of the tank.

9. An adaptive cooling system according to claim 8, characterized in that: A secondary turbulence shield is fixedly installed on the inner side wall corresponding to the air inlet of the tank.

10. An adaptive cooling system according to claim 9, characterized in that: A first annular demister mesh is installed between the lower end of the secondary shroud and the inner wall of the tank, and a second annular demister mesh is installed on the inner wall of the tank below the impact disc.

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