Complex binary refrigeration system and control method thereof
By dynamically allocating cooling capacity and recovering heat through a dual-stage refrigeration system, the problems of equipment waste and high integration difficulty in traditional environmental testing are solved, and a compact and efficient testing solution is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BIAKLEIN TESTING TECH (SHANGHAI) CO LTD
- Filing Date
- 2023-12-04
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional environmental testing methods use separate temperature and humidity chambers and coolant supply devices, which leads to problems such as wasted equipment configuration capabilities, large footprint, high energy consumption, high integration difficulty, high cost and high operating cost.
The system employs a dual-stage refrigeration system, which dynamically allocates refrigeration capacity by combining low-temperature and high-temperature refrigeration stages. It integrates air refrigeration and coolant cooling functions to achieve heat recovery and compact equipment integration.
It reduces equipment energy consumption and footprint, reduces redundant sensors and operating costs, improves the stability and convenience of testing, and reduces integration difficulty and infrastructure requirements.
Smart Images
Figure CN117537501B_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present invention relate to a refrigeration system and its control method, and particularly to a complex binary refrigeration system and its control method. Background Technology
[0002] Traditional environmental testing methods use a separate temperature and humidity chamber to provide the necessary air environment for product testing, while also configuring a separate coolant supply system to provide the coolant required for product operation. This approach, using two sets of equipment in conjunction, has significant drawbacks: Testing of test components often requires continuous temperature conditions, resulting in constant switching between high and low temperatures. This switching can be categorized into two types: synchronous high and low temperature air-side and coolant-side temperature changes, where one air-side and coolant-side temperature change simultaneously at a high temperature while the other changes at a low temperature. In asynchronous high and low temperature scenarios, both the environmental chamber and coolant system must fully cover the product's heat capacity load and the heat generation load generated during temperature changes. Even in synchronous high and low temperature scenarios, the proportion of these loads measured on the air-side and coolant-side is very difficult to estimate and varies under different operating conditions. Therefore, both refrigeration systems need to fully consider the sample's thermal and heat loads during operating condition changes, leading to wasted capacity when using both systems together; simultaneously, it also wastes total water and electricity capacity. This inevitably increases the overall equipment investment required for the testing process.
[0003] Because these are two independent refrigeration units, they require a larger footprint, leading to an inefficient layout. This results in excessively long piping connections between the liquid cooling unit and the sample, causing heat loss and increased energy consumption. Furthermore, the liquid temperature and pressure measured by the equipment will differ significantly from those measured on the sample. Obtaining more accurate inlet and outlet temperatures and pressures requires additional sensors, further increasing equipment investment. Moreover, the measurement and comparison of these sensors will undoubtedly increase operational costs.
[0004] The air and coolant conditions tested on the device under test need to be synchronized with the motor test bench and charging / discharging equipment. This makes the system integration of multiple devices more difficult, the workload more substantial, and also more prone to vulnerabilities and errors. Summary of the Invention
[0005] The purpose of this invention is to provide a dual-stage refrigeration system that dynamically allocates cooling capacity based on actual needs in a temperature and humidity environment chamber and a coolant side, and adjusts the amount of refrigerant in the air refrigeration unit by regulating the amount of refrigerant in the coolant cooling device.
[0006] To achieve the above objectives, embodiments of the present invention provide a complex binary refrigeration system, comprising: Low-temperature refrigeration system compressor unit; A cryogenic refrigeration system expansion container is connected to the cryogenic refrigeration system compressor unit. A refrigeration regulating unit for a low-temperature refrigeration system is connected to the expansion container of the low-temperature refrigeration system. High-temperature refrigeration system compressor unit; The first high-temperature stage refrigeration system refrigeration regulation unit is connected to the compressor unit of the high-temperature stage refrigeration system. The second high-temperature stage refrigeration system refrigeration regulation unit is connected to the first high-temperature stage refrigeration system refrigeration regulation unit; the second high-temperature stage refrigeration system refrigeration regulation unit is connected to one end of the high-temperature stage refrigeration system gas-liquid separator; the high-temperature stage refrigeration system gas-liquid separator is connected to the high-temperature stage refrigeration system compressor unit. A low-temperature stage refrigeration system refrigeration regulation unit, wherein the second high-temperature stage refrigeration system refrigeration regulation unit is connected to the low-temperature stage refrigeration system refrigeration regulation unit; The device under test is connected to the refrigeration regulating unit of the first high-temperature stage refrigeration system. When the high-temperature stage refrigeration system compressor unit cools the device under test through the first high-temperature stage refrigeration system refrigeration regulation unit, the returned coolant cools the coolant of the low-temperature stage refrigeration system compressor unit through the second high-temperature stage refrigeration system refrigeration regulation unit; thus, when the low-temperature stage refrigeration system compressor unit cools the low-temperature stage refrigeration system refrigeration regulation unit, cascade cooling is achieved.
[0007] Furthermore, in the dual-stage refrigeration system of the present invention, both the low-temperature stage refrigeration system refrigeration regulation unit and the device under test are disposed in the temperature and humidity environment chamber.
[0008] Furthermore, in the dual-stage refrigeration system of the present invention, the first high-temperature stage refrigeration system refrigeration regulating unit and the second high-temperature stage refrigeration system refrigeration regulating unit are connected in parallel and then connected to the high-temperature stage refrigeration system compressor unit. The high-temperature refrigeration system compressor unit is connected to the high-temperature refrigeration system gas-liquid separator; The gas-liquid separator of the high-temperature refrigeration system is connected to the low-pressure junction point of the first high-temperature refrigeration system refrigeration regulation unit and the second high-temperature refrigeration system refrigeration regulation unit connected in parallel.
[0009] Furthermore, in the dual-stage refrigeration system of the present invention, the high-temperature stage refrigeration system compressor unit further includes: High-temperature compressor; The first compressor inlet damping pipe is connected at the inlet of the high-temperature compressor. A first compressor outlet damping pipe is connected at the outlet of the high-temperature compressor. The first oil separator is connected to the inlet of the first oil separator at the outlet of the high-temperature compressor; The first condenser is connected to the inlet of the first condenser at the outlet of the first oil separator; A first dryer filter is connected to the inlet of the first dryer filter at the outlet of the first condenser; A bypass valve is provided, with the outlet of the first oil separator connected to the inlet of the bypass valve. The first expansion valve, the outlet of the bypass valve is connected to the inlet of the first expansion valve; the outlet of the first expansion valve is connected to the refrigeration regulating unit of the first high-temperature refrigeration system. The outlet of the bypass valve is also connected to the inlet of the gas-liquid separator of the high-temperature refrigeration system; the outlet of the gas-liquid separator of the high-temperature refrigeration system returns to the inlet of the high-temperature compressor through the inlet damping pipe of the first compressor.
[0010] Furthermore, in the dual-stage refrigeration system of the present invention, the first high-temperature stage refrigeration system refrigeration regulation unit further includes: The outlet of the first expansion valve in the compressor unit of the high-temperature refrigeration system is connected to the inlet of the first solenoid valve. An expansion valve, wherein the outlet of the first solenoid valve is connected to the inlet of the expansion valve; The first evaporator; the outlet of the expansion valve is connected to the S3 terminal of the first evaporator; the S4 terminal of the first evaporator is connected to the inlet of the gas-liquid separator of the high-temperature refrigeration system; The S1 end of the first evaporator is connected to the inlet of the device under test; The S2 end of the first evaporator is connected to the outlet of the device under test, and the device under test is cooled under a load greater than -40°C.
[0011] Furthermore, the aforementioned dual-element refrigeration system, such as Figure 1 As shown, the device under test further includes: A coolant circulation pump is connected to the outlet of the first evaporator of the first high-temperature stage refrigeration system refrigeration regulating unit. The test specimen is connected to one side of the coolant circulation pump; the other side of the test specimen is connected to the S2 end of the first evaporator.
[0012] Furthermore, in the dual-stage refrigeration system of the present invention, the second high-temperature stage refrigeration system refrigeration regulation unit further includes: The second solenoid valve is connected to the inlet of the second solenoid valve between the outlet of the first dryer filter and the inlet of the first expansion valve of the compressor unit of the high-temperature refrigeration system. The second expansion valve is connected to the inlet of the second expansion valve at the outlet of the second solenoid valve; Intermediate heat exchanger; the outlet of the second expansion valve is connected to the S3 end of the intermediate heat exchanger; the S4 end of the intermediate heat exchanger is connected to the inlet of the gas-liquid separator of the high-temperature refrigeration system; The S1 end of the intermediate heat exchanger is connected to the outlet of the precooler in the compressor unit of the high-temperature refrigeration system. The S2 end of the intermediate heat exchanger is connected to the inlet of the dryer filter of the low-temperature refrigeration system; the outlet of the dryer filter of the low-temperature refrigeration system is connected between the third expansion valve in the expansion container of the low-temperature refrigeration system and the third solenoid valve in the refrigeration regulating unit of the low-temperature refrigeration system.
[0013] Furthermore, in the dual-stage refrigeration system of the present invention, the low-temperature stage refrigeration system compressor unit further includes: Cryogenic compressor, The second compressor inlet damping pipe is connected at the inlet of the low-temperature compressor; A second compressor outlet damping pipe is connected at the outlet of the cryogenic compressor. A second oil separator is connected to the inlet of the second oil separator at the outlet of the cryogenic compressor; The precooler is connected to the inlet of the precooler at the outlet of the second oil separator; the outlet of the precooler is connected to the S1 end of the intermediate heat exchanger of the refrigeration regulating unit of the second high-temperature refrigeration system.
[0014] The inlet of the cryogenic compressor is connected to the outlet of the first throttle valve of the expansion vessel of the cryogenic stage refrigeration system.
[0015] Furthermore, in the dual-stage refrigeration system of the present invention, the cryogenic stage refrigeration system expansion container further includes: Expansion container; A fourth solenoid valve is connected to the inlet of the expansion container; the outlet of the fourth solenoid valve is connected to the outlet of the precooler of the cryogenic refrigeration system compressor unit. The inlet of the first throttle valve is connected to the expansion container; The third expansion valve is connected to the outlet of the first throttle valve and the inlet of the third expansion valve. The outlet of the third expansion valve is connected to the outlet of the low-temperature refrigeration system dryer filter in the second high-temperature refrigeration system refrigeration regulation unit and the inlet of the third solenoid valve in the low-temperature refrigeration system refrigeration regulation unit.
[0016] Furthermore, in the dual-stage refrigeration system of the present invention, the cryogenic stage refrigeration system refrigeration regulation unit further includes: The fifth expansion valve is connected to the inlet of the third solenoid valve at the outlet. Evaporator; the outlet of the fifth expansion valve is connected to the inlet of the evaporator; the outlet of the evaporator is connected to the inlet of the compressor inlet damping tube.
[0017] Furthermore, in the dual refrigeration system of the present invention, a fan is installed above the evaporator in a temperature and humidity environment chamber.
[0018] This invention also provides a control method for a dual-element refrigeration system, the method further comprising the following steps: When the temperature and humidity environment chamber needs to be cooled, the high-temperature compressor and the second solenoid valve are started to cool the intermediate heat exchanger. When the pressure of the cascade low-temperature stage meets the start-up conditions, the low-temperature compressor and the third solenoid valve are started to cool the evaporator in the temperature and humidity environment chamber. As the temperature and humidity environment chamber circulates air through the fan, the temperature and humidity environment chamber is cooled and cooled down. When the cryogenic compressor is working, if the discharge pressure is too high and exceeds the limit, the fourth solenoid valve will be opened to relieve the pressure. At the same time, the third solenoid valve will be closed according to the duty cycle. When the evaporator energy is adjusted in the temperature and humidity environment chamber, if the temperature and humidity environment chamber is closed, the third expansion valve can supply some refrigerant to the cryogenic compressor. If the return gas pressure of the cryogenic compressor is too low, the fourth solenoid valve can be opened to supplement some hot refrigerant into the cryogenic compressor. When the test specimen requires coolant, the high-temperature compressor and the first solenoid valve are started; at the same time, the coolant circulation pump is started, allowing the coolant to circulate directly between the first evaporator and the test specimen; when adjusting the cooling capacity on the refrigerant side and the cascade intermediate plate, if both the first and second solenoid valves are closed, the first expansion valve provides part of the refrigerant flow. If the suction pressure of the high-temperature compressor is too low at this time, the bypass valve can be opened to bypass part of the hot refrigerant to the high-temperature compressor. When both the temperature and humidity chamber and the coolant require cooling capacity, the entire system operates simultaneously. Based on the cooling capacity requirements of the temperature and humidity chamber and the coolant, the opening and closing duty cycles of the first and third solenoid valves are dynamically adjusted to achieve the purpose of regulating the cooling capacity on the load side. The second solenoid valve and the second expansion valve control the high-temperature compressor by adjusting the duty cycle or opening degree, so that the dual-stage refrigeration system operates within a suitable pressure range.
[0019] Compared with the prior art, the embodiments of the present invention employ a dual-stage refrigeration system, wherein an air refrigeration device is connected to a temperature and humidity environment chamber, and the air refrigeration device refrigerates the temperature and humidity environment chamber; a coolant device is installed inside the temperature and humidity environment chamber; a coolant cooling device is connected to the coolant device; the coolant cooling device cools the coolant cooling device; the coolant device cools the workpiece; and an adjusting device adjusts the duty cycle to control the amount of refrigerant in the coolant cooling device that cools the air refrigeration device.
[0020] This invention recovers and utilizes the heat from the air cooling and coolant cooling devices, significantly reducing equipment energy consumption. Furthermore, during simultaneous high and low temperature changes, the equipment capacity can be dynamically allocated according to the actual needs of the temperature and humidity chamber and coolant device to meet experimental requirements. This reduces the overall configuration capacity of the device, minimizing waste and resulting in a smaller size. Simultaneously, integrating the temperature and humidity chamber and coolant device within the same frame creates a more compact structure, significantly reducing size and cost. It also greatly reduces piping connection work; the significantly shortened piping means that friction loss is negligible, reducing the investment in redundant sensors and operating costs, improving experimental stability. Idle time and capacity waste of heating and cooling equipment are minimized, and the installation layout is optimized for maximum ease of use. Heat recovery is also possible under special testing conditions, further reducing overall energy consumption. Simultaneously, it reduces the difficulty of integrating the entire laboratory testing system, significantly lowers the demand for infrastructure such as water and electricity, and substantially reduces operation and maintenance costs.
[0021] This solution addresses the shortcomings of traditional environmental testing methods that rely on separate temperature and humidity chambers to provide the necessary air environment for product testing, while also requiring a separate coolant supply system. The use of two separate systems presents significant technical limitations. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the various embodiments of this invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this invention to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.
[0024] The first embodiment of the present invention relates to a complex binary refrigeration system, such as... Figure 1 As shown, it includes: The dual-stage refrigeration system of this invention includes a low-temperature stage refrigeration system compressor unit 400; the low-temperature stage refrigeration system compressor unit 400 is mainly used to provide refrigeration power for the temperature and humidity environment chamber 700. The cryogenic refrigeration system expansion container 500 is connected to the cryogenic refrigeration system compressor unit 400; the cryogenic refrigeration system expansion container 500 is used for buffering and expanding the coolant of the cryogenic refrigeration system compressor unit 400.
[0025] The expansion container 500 of the low-temperature refrigeration system is connected to the refrigeration regulating unit 600 of the low-temperature refrigeration system; the refrigeration regulating unit 600 of the low-temperature refrigeration system, driven by the compressor unit 400 of the low-temperature refrigeration system, refrigerates the temperature and humidity environment chamber 700. In the dual-stage refrigeration system of the present invention, a high-temperature stage refrigeration system compressor unit 100 is provided; the high-temperature stage refrigeration system compressor unit 100 is mainly used to provide refrigerant driving kinetic energy for the refrigeration of the device under test 800. A first high-temperature refrigeration system refrigeration regulating unit 200 is connected to the high-temperature refrigeration system compressor unit 100; similarly, the first high-temperature refrigeration system refrigeration regulating unit 200, driven by the high-temperature refrigeration system compressor unit 100, cools the device under test 800 for low-temperature testing.
[0026] The first high-temperature refrigeration system refrigeration regulating unit 200 is connected to the second high-temperature refrigeration system refrigeration regulating unit 300; the second high-temperature refrigeration system refrigeration regulating unit 300 is connected to one end of the high-temperature refrigeration system gas-liquid separator 14; the high-temperature refrigeration system gas-liquid separator 14 is connected to the high-temperature refrigeration system compressor unit 100. The second high-temperature stage refrigeration system refrigeration regulating unit 300 is connected to the low-temperature stage refrigeration system refrigeration regulating unit 600; The device under test (DUT) is connected to the refrigeration regulating unit 200 of the first high-temperature stage refrigeration system. When the high-temperature stage refrigeration system compressor unit 100 cools the device under test 800 through the first high-temperature stage refrigeration system refrigeration regulating unit 200, the returned coolant cools the coolant of the low-temperature stage refrigeration system compressor unit 400 through the second high-temperature stage refrigeration system refrigeration regulating unit 300; thus, when the low-temperature stage refrigeration system compressor unit 400 cools the low-temperature stage refrigeration system refrigeration regulating unit 600, cascade cooling is achieved.
[0027] The first high-temperature stage refrigeration system cooling regulation unit 200 and the second high-temperature stage refrigeration system cooling regulation unit 300 mainly recover and utilize the heat from the high-temperature stage refrigeration system compressor unit 100 and the low-temperature stage refrigeration system compressor unit 400, which can significantly reduce the energy consumption of the equipment. Moreover, when synchronously changing between high and low temperatures, the equipment capacity can be dynamically allocated according to the actual needs of the temperature and humidity environment chamber 700 and the second high-temperature stage refrigeration system cooling regulation unit 300 to meet the experimental requirements. This reduces the overall configuration capacity of the device of the present invention, minimizes waste, and thus reduces its size. Meanwhile, integrating the temperature and humidity environment chamber 700 and the device under test 800 within the same frame results in a more compact structure, significantly reduced size, lower costs, and a substantial reduction in piping connection work. The significantly shortened piping means that friction loss is negligible, thus reducing the investment and operating costs of redundant sensors, improving test stability, minimizing idle time and wasted capacity of heating and cooling equipment, optimizing the installation layout, and achieving the best ease of use. Heat recovery is also possible under special test conditions, significantly reducing overall energy consumption. At the same time, it reduces the difficulty of integrating the entire laboratory testing system, significantly reduces the demand for infrastructure such as water and electricity, and can also significantly reduce operation and maintenance costs.
[0028] This solution addresses the shortcomings of traditional environmental testing methods that rely on separate temperature and humidity chambers to provide the necessary air environment for product testing, while also requiring a separate coolant supply system. The use of two separate systems presents significant technical limitations.
[0029] To achieve the above-mentioned technical effects, such as Figure 1 As shown, in the dual-stage refrigeration system of this embodiment, both the low-temperature stage refrigeration system refrigeration regulation unit 600 and the device under test 800 are installed in the temperature and humidity environment chamber 700.
[0030] To achieve the above-mentioned technical effects, such as Figure 1 As shown, in the dual-stage refrigeration system of this embodiment, the first high-temperature stage refrigeration system refrigeration regulation unit 200 and the second high-temperature stage refrigeration system refrigeration regulation unit 300 are connected in parallel and then connected to the high-temperature stage refrigeration system compressor unit 100. The compressor unit 100 of the high-temperature refrigeration system is connected to the gas-liquid separator 14 of the high-temperature refrigeration system. The gas-liquid separator 14 of the high-temperature refrigeration system is connected to the low-pressure junction point of the first high-temperature refrigeration system refrigeration regulating unit 200 and the second high-temperature refrigeration system refrigeration regulating unit 300 connected in parallel.
[0031] To achieve the above-mentioned technical effects, such as Figure 1 As shown, in the dual-stage refrigeration system of this embodiment, the high-temperature stage refrigeration system compressor unit 100 further includes: High-temperature compressor 1 provides the power to compress the refrigerant. Connect the first compressor inlet damping tube 15 to the inlet of the high temperature compressor 1; A first compressor outlet damping pipe 2 is connected to the outlet of the high-temperature compressor 1; the first compressor inlet damping pipe 15 and the first compressor outlet damping pipe 2 provide vibration damping for the high-temperature compressor 1.
[0032] The inlet of the first oil separator 3 is connected to the outlet of the high-temperature compressor 1; the first oil separator 3 separates the cooling oil and coolant in the high-temperature compressor 1 during operation. The outlet of the first oil separator 3 is connected to the inlet of the first condenser 4; the first condenser 4 cools the coolant separated by the first oil separator 3. The inlet of the first dryer filter 5 is connected to the outlet of the first condenser 4; the first dryer filter 5 dries the refrigerant after it has been cooled by the first condenser 4. The outlet of the first oil separator 3 is connected to the inlet of the bypass valve 18; the bypass valve 18 is mainly used to bypass some of the hot refrigerant to the high-temperature compressor 1, and the bypass valve 18 mainly plays the role of bypass.
[0033] The outlet of the bypass valve 18 is connected to the inlet of the first expansion valve 6; the outlet of the first expansion valve 6 is connected to the first high-temperature stage refrigeration system refrigeration regulating unit 200; the first expansion valve 6 is used to vaporize the high-temperature refrigerant produced by the high-temperature compressor 1 to reduce the temperature.
[0034] The outlet of the bypass valve 18 is also connected to the inlet of the gas-liquid separator 14 of the high-temperature refrigeration system; the outlet of the gas-liquid separator 14 of the high-temperature refrigeration system returns to the inlet of the high-temperature compressor 1 through the first compressor inlet damping pipe 15.
[0035] To achieve the above-mentioned technical effects, such as Figure 1 As shown, in the dual-stage refrigeration system of this embodiment, the first high-temperature stage refrigeration system refrigeration regulation unit 200 further includes: The outlet of the first expansion valve 6 in the high-temperature refrigeration system compressor unit 100 is connected to the inlet of the first solenoid valve 8; the first solenoid valve 8 is used to switch the refrigerant supplied to the first evaporator 10. The outlet of the first solenoid valve 8 is connected to the inlet of the expansion valve 9; the expansion valve 9 is used to control the flow rate of refrigerant to the first evaporator 10, control its cooling effect, and control the temperature of the coolant.
[0036] The outlet of expansion valve 9 is connected to the S3 terminal of the first evaporator 10; the S4 terminal of the first evaporator 10 is connected to the inlet of the gas-liquid separator 14 of the high-temperature refrigeration system; the first evaporator 10, The S1 end of the first evaporator 10 is connected to the inlet of the device under test 800; The S2 end of the first evaporator 10 is connected to the outlet of the device under test 800, and the first evaporator 10 cools the device under test 800 under a load greater than -40°C.
[0037] To achieve the above-mentioned technical effects, such as Figure 1 As shown, in the complex binary refrigeration system of this embodiment, the device under test 800 further includes: The outlet of the coolant circulation pump 16 is connected to the S1 end of the first evaporator 10 of the first high-temperature stage refrigeration system refrigeration regulation unit 200. The coolant circulation pump 16 is used to circulate coolant.
[0038] The inlet of the coolant circulation pump 16 is connected to one side of the test specimen 17; the other side of the test specimen 17 is connected to the S2 end of the first evaporator 10. The test specimen 17 is used for low-temperature testing.
[0039] To achieve the above-mentioned technical effects, such as Figure 1 As shown, in the dual-stage refrigeration system of this embodiment, the second high-temperature stage refrigeration system refrigeration regulation unit 300 further includes: The outlet of the first dryer filter 5 and the inlet of the first expansion valve 6 of the high-temperature refrigeration system compressor unit 100 are connected to the inlet of the second solenoid valve 11; the second solenoid valve 11 controls the refrigerant flowing to the intermediate heat exchanger 13, and uses the low-temperature refrigerant to cool down the high-temperature refrigerant on the low-temperature compressor 21, thereby reducing energy waste.
[0040] The outlet of the second solenoid valve 11 is connected to the inlet of the second expansion valve 12; the second expansion valve 12 is used to control the flow rate of refrigerant to the intermediate heat exchanger 13, control its cooling effect, and control the temperature of the coolant.
[0041] The outlet of the second expansion valve 12 is connected to the S3 end of the intermediate heat exchanger 13; the S4 end of the intermediate heat exchanger 13 is connected to the inlet of the gas-liquid separator of the high-temperature refrigeration system. The S1 end of the intermediate heat exchanger 13 is connected to the outlet of the precooler 24 in the compressor unit 100 of the high-temperature refrigeration system; The S2 end of the intermediate heat exchanger 13 is connected to the inlet of the low-temperature refrigeration system dryer filter 25; the outlet of the low-temperature refrigeration system dryer filter 25 is connected between the third expansion valve 26 in the low-temperature refrigeration system expansion container 500 and the third solenoid valve 28 in the low-temperature refrigeration system refrigeration regulating unit 600. The third solenoid valve 28 controls the cooling rate of the evaporator 30 in the temperature and humidity environment chamber 700; the third solenoid valve 28 controls the switching of the coolant pumped out by the first compressor 21. The third expansion valve 26 controls the cooling rate of the evaporator 30.
[0042] To achieve the above-mentioned technical effects, such as Figure 1 As shown, in the dual-stage refrigeration system of this embodiment, the low-temperature stage refrigeration system compressor unit 400 further includes: The cryogenic compressor 21 is mainly used to compress refrigerant and provide pressure for refrigeration by pressurizing the refrigerant.
[0043] Connect the inlet damping tube 35 of the second compressor to the inlet of the cryogenic compressor 21; A second compressor outlet damping pipe 22 is connected to the outlet of the cryogenic compressor 21; the second compressor inlet damping pipe 35 and the second compressor outlet damping pipe 22 are mainly used to dampen the cryogenic compressor 21.
[0044] The inlet of the second oil separator 23 is connected to the outlet of the cryogenic compressor 21; the second oil separator 23 separates the cooling oil and coolant of the cryogenic compressor 21.
[0045] The outlet of the second oil separator 23 is connected to the inlet of the precooler 24; the outlet of the precooler 24 is connected to the S1 end of the intermediate heat exchanger 13 of the second high-temperature stage refrigeration system refrigeration regulating unit 300. The precooler 24 precools the coolant separated by the second oil separator 23.
[0046] The inlet of the cryogenic compressor 21 is connected to the outlet of the first throttle valve 33 of the cryogenic stage refrigeration system expansion container 500.
[0047] To achieve the above-mentioned technical effects, such as Figure 1 As shown, in the dual-stage refrigeration system of this embodiment, the cryogenic stage refrigeration system expansion container 500 further includes: The expansion container 32 is mainly used to store coolant and to buffer the intake pressure of the cryogenic compressor 21 during operation.
[0048] The inlet of the fourth solenoid valve 31 is connected to the expansion container 32; the outlet of the fourth solenoid valve 31 is connected to the outlet of the precooler 24 of the cryogenic refrigeration system compressor unit 400; the fourth solenoid valve 31 is used to supplement some of the heated refrigerant into the cryogenic compressor 21.
[0049] The inlet of the first throttle valve 33 is connected to the expansion container 32; The outlet of the first throttle valve 33 is connected to the inlet of the third expansion valve 26; the outlet of the third expansion valve 26 is connected to the outlet of the low-temperature refrigeration system dryer filter 25 in the second high-temperature refrigeration system refrigeration regulating unit 300 and the inlet of the third solenoid valve 28 in the low-temperature refrigeration system refrigeration regulating unit 600. The third expansion valve 26 controls the cooling rate of the evaporator 30.
[0050] To achieve the above-mentioned technical effects, such as Figure 1 As shown, in the dual-stage refrigeration system of this embodiment, the low-temperature stage refrigeration system refrigeration regulation unit 600 further includes: The outlet of the third solenoid valve 28 is connected to the inlet of the fifth expansion valve 29; the fifth expansion valve 29 is used to control the flow rate of the coolant entering the evaporator 30, thereby achieving temperature control of the evaporator 30.
[0051] The outlet of the fifth expansion valve 29 is connected to the inlet of the evaporator 30; the outlet of the evaporator 30 is connected to the inlet of the second compressor inlet damping tube 35.
[0052] To achieve the above-mentioned technical effects, such as Figure 1 As shown, in the dual-stage refrigeration system of this embodiment, a fan 99 is installed above the evaporator 30 in the temperature and humidity environment chamber 700. The fan 99 is used to circulate air in the temperature and humidity environment chamber 700, enabling the temperature and humidity environment chamber 700 to perform temperature tests.
[0053] In a second embodiment of the present invention, a control method for a dual-element refrigeration system is also provided, the method further comprising the following steps: When the temperature and humidity environment chamber 700 needs to be cooled, the high temperature compressor 1 and the second solenoid valve 11 are started; the intermediate heat exchanger 13 is cooled; when the pressure of the cascade low temperature stage meets the start-up conditions, the low temperature compressor 21 and the third solenoid valve 28 are started to cool the evaporator 30 in the temperature and humidity environment chamber 700. As the temperature and humidity environment chamber 700 circulates air through the fan 99, the temperature and humidity environment chamber 700 is cooled and cooled. When the cryogenic compressor 21 starts working, if the discharge pressure is too high and exceeds the limit, the fourth solenoid valve 31 will be opened to relieve the pressure. At the same time, the third solenoid valve 28 will be closed according to the duty cycle. When the evaporator 30 of the temperature and humidity environment chamber 700 is adjusting its energy, if the temperature and humidity environment chamber 700 is closed, the third expansion valve 26 can supply some refrigerant to the cryogenic compressor 21. If the return gas pressure of the cryogenic compressor 21 is too low, the fourth solenoid valve 31 can be opened to supplement some hot refrigerant into the cryogenic compressor 21. When test specimen 17 requires coolant, the high-temperature compressor 1 and the first solenoid valve 8 are started; at the same time, the coolant circulation pump 16 is started, allowing the coolant to circulate directly between the first evaporator 10 and the test specimen 17; when adjusting the cooling capacity on the refrigerant side and the cascade intermediate plate, if both the first solenoid valve 8 and the second solenoid valve 11 are closed, the first expansion valve 6 provides part of the refrigerant flow. If the suction pressure of the high-temperature compressor 1 is too low at this time, the bypass valve 18 can be opened to bypass part of the hot refrigerant to the high-temperature compressor 1. When both the temperature and humidity environment chamber 700 and the coolant require cooling capacity, the entire system works simultaneously. At the same time, based on the cooling capacity requirements of the humidity environment chamber 700 and the coolant side, the opening and closing duty cycles of the first solenoid valve 8 and the third solenoid valve 28 are dynamically adjusted to achieve the purpose of adjusting the cooling capacity on the load side. The second solenoid valve 11 and the second expansion valve 12 control the high-temperature compressor 1 by adjusting the duty cycle or opening degree, so that the dual-stage refrigeration system operates within a suitable pressure range.
[0054] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.
Claims
1. A complex binary refrigeration system, characterized in that, include: Low-temperature refrigeration system compressor unit (400); The cryogenic refrigeration system expansion container (500) is connected to the cryogenic refrigeration system compressor unit (400). A low-temperature refrigeration system refrigeration regulating unit (600) is connected to the low-temperature refrigeration system expansion container (500). High-temperature refrigeration system compressor unit (100); The first high-temperature stage refrigeration system refrigeration regulation unit (200) is connected to the high-temperature stage refrigeration system compressor unit (100). The second high-temperature stage refrigeration system refrigeration regulating unit (300) is connected to the first high-temperature stage refrigeration system refrigeration regulating unit (200); the second high-temperature stage refrigeration system refrigeration regulating unit (300) is connected to one end of the high-temperature stage refrigeration system gas-liquid separator (14); the high-temperature stage refrigeration system gas-liquid separator (14) is connected to the high-temperature stage refrigeration system compressor unit (100). The low-temperature stage refrigeration system refrigeration regulation unit (600) is connected to the second high-temperature stage refrigeration system refrigeration regulation unit (300). The device under test (800) is connected to the refrigeration regulation unit (200) of the first high-temperature refrigeration system. When the high-temperature refrigeration system compressor unit (100) cools the device under test (800) through the first high-temperature refrigeration system refrigeration regulating unit (200), the returned coolant is used to cool the coolant of the low-temperature refrigeration system compressor unit (400) through the second high-temperature refrigeration system refrigeration regulating unit (300). When the compressor unit (400) of the low-temperature refrigeration system cools the refrigeration regulating unit (600) of the low-temperature refrigeration system, cascade cooling is achieved.
2. The dual-element refrigeration system according to claim 1, characterized in that, The refrigeration regulation unit (600) of the low-temperature refrigeration system and the device under test (800) are both installed in a temperature and humidity environment chamber (700).
3. The dual-element refrigeration system according to claim 1, characterized in that, The first high-temperature refrigeration system refrigeration regulating unit (200) and the second high-temperature refrigeration system refrigeration regulating unit (300) are connected in parallel and then connected to the high-temperature refrigeration system compressor unit (100); The high-temperature refrigeration system compressor unit (100) is connected to the high-temperature refrigeration system gas-liquid separator (14); The low-pressure junction of the gas-liquid separator (14) of the high-temperature refrigeration system, the refrigeration regulating unit (200) of the first high-temperature refrigeration system, and the refrigeration regulating unit (300) of the second high-temperature refrigeration system is connected.
4. The dual-element refrigeration system according to claim 3, characterized in that, The high-temperature refrigeration system compressor unit (100) further includes: High-temperature compressor (1); The first compressor inlet damping pipe (15) is connected at the inlet of the high temperature compressor (1). First compressor outlet damping pipe (2), connected at the outlet of the high temperature compressor (1); The first oil separator (3) is connected to the inlet of the first oil separator (3) at the outlet of the high temperature compressor (1); The first condenser (4) is connected to the inlet of the first condenser (4) at the outlet of the first oil separator (3); The first dryer filter (5) is connected to the inlet of the first dryer filter (5) at the outlet of the first condenser (4); The outlet of the first oil separator (3) is connected to the inlet of the bypass valve (18); The outlet of the first expansion valve (6) is connected to the inlet of the bypass valve (18); the outlet of the first expansion valve (6) is connected to the first high-temperature refrigeration system refrigeration regulating unit (200). The outlet of the bypass valve (18) is also connected to the inlet of the gas-liquid separator (14) of the high-temperature refrigeration system; the outlet of the gas-liquid separator (14) of the high-temperature refrigeration system returns to the inlet of the high-temperature compressor (1) through the first compressor inlet damping pipe (15).
5. The dual-element refrigeration system according to claim 3, characterized in that, The first high-temperature stage refrigeration system refrigeration regulation unit (200) further includes: The outlet of the first expansion valve (6) in the high-temperature refrigeration system compressor unit (100) is connected to the inlet of the first solenoid valve (8); An expansion valve (9) is provided, with the outlet of the first solenoid valve (8) connected to the inlet of the expansion valve (9). The outlet of the expansion valve (9) is connected to the S3 end of the first evaporator (10); the S4 end of the first evaporator (10) is connected to the inlet of the gas-liquid separator (14) of the high-temperature refrigeration system; The S1 end of the first evaporator (10) is connected to the inlet of the device under test (800); The S2 end of the first evaporator (10) is connected to the outlet of the device under test (800) to cool the device under test (800) under a load greater than -40°C.
6. The dual-element refrigeration system according to claim 3, characterized in that, The device under test (800) further includes: The outlet of the coolant circulation pump (16) is connected to the S1 end of the first evaporator (10) of the first high-temperature stage refrigeration system refrigeration regulating unit (200). The test specimen (17) has its inlet of the coolant circulation pump (16) connected to one side of the test specimen (17); the other side of the test specimen (17) is connected to the S2 end of the first evaporator (10).
7. The dual-element refrigeration system according to claim 3, characterized in that, The second high-temperature stage refrigeration system refrigeration regulation unit (300) further includes: The second solenoid valve (11) is connected to the inlet of the second solenoid valve (11) between the outlet of the first dryer filter (5) and the inlet of the first expansion valve (6) of the high-temperature refrigeration system compressor unit (100); The second expansion valve (12) is connected to the inlet of the second expansion valve (12) at the outlet of the second solenoid valve (11); Intermediate heat exchanger (13); the outlet of the second expansion valve (12) is connected to the S3 end of the intermediate heat exchanger (13); the S4 end of the intermediate heat exchanger (13) is connected to the inlet of the gas-liquid separator of the high-temperature refrigeration system; The S1 end of the intermediate heat exchanger (13) is connected to the outlet of the precooler (24) in the compressor unit (100) of the high-temperature refrigeration system; The S2 end of the intermediate heat exchanger (13) is connected to the inlet of the low-temperature refrigeration system dryer filter (25); the outlet of the low-temperature refrigeration system dryer filter (25) is connected between the third expansion valve (26) in the low-temperature refrigeration system expansion container (500) and the third solenoid valve (28) in the low-temperature refrigeration system refrigeration regulating unit (600).
8. The dual-element refrigeration system according to claim 1, characterized in that, The aforementioned cryogenic refrigeration system compressor unit (400) further includes: Cryogenic compressor (21). The second compressor inlet damping pipe (35) is connected at the inlet of the cryogenic compressor (21). The second compressor outlet damping pipe (22) is connected at the outlet of the cryogenic compressor (21). The inlet of the second oil separator (23) is connected to the outlet of the cryogenic compressor (21); The precooler (24) is connected to the inlet of the precooler (24) at the outlet of the second oil separator (23); the outlet of the precooler (24) is connected to the S1 end of the intermediate heat exchanger (13) of the second high-temperature refrigeration system refrigeration regulating unit (300); The inlet of the cryogenic compressor (21) is connected to the outlet of the first throttle valve (33) of the cryogenic stage refrigeration system expansion vessel (500).
9. The dual-element refrigeration system according to claim 1, characterized in that, The cryogenic refrigeration system expansion container (500) further includes: Expansion container (32); A fourth solenoid valve (31) is connected to the inlet of the expansion container (32); the outlet of the fourth solenoid valve (31) is connected to the outlet of the precooler (24) of the low-temperature refrigeration system compressor unit (400). The inlet of the first throttle valve (33) is connected to the expansion container (32); The third expansion valve (26) is connected to the inlet of the third expansion valve (26) at the outlet of the first throttle valve (33); the outlet of the third expansion valve (26) is connected to the outlet of the low-temperature refrigeration system dryer filter (25) in the second high-temperature refrigeration system refrigeration regulating unit (300) and the inlet of the third solenoid valve (28) in the low-temperature refrigeration system refrigeration regulating unit (600).
10. The dual-element refrigeration system according to claim 9, characterized in that, The cryogenic refrigeration regulating unit (600) of the aforementioned cryogenic refrigeration system further includes: The fifth expansion valve (29) is connected to the inlet of the third solenoid valve (28) at the outlet; Evaporator (30); the outlet of the fifth expansion valve (29) is connected to the inlet of the evaporator (30); the outlet of the evaporator (30) is connected to the inlet of the second compressor inlet damping tube (35).
11. The dual-element refrigeration system according to claim 10, characterized in that, A fan (99) is installed above the evaporator (30) in a temperature and humidity environment chamber (700).
12. A control method for a complex binary refrigeration system, characterized in that, The method further includes the following steps: When the temperature and humidity environment chamber (700) needs to be cooled, the high temperature compressor (1) and the second solenoid valve (11) are started; the intermediate heat exchanger (13) is cooled; when the pressure of the cascade low temperature stage meets the start-up conditions, the low temperature compressor (21) and the third solenoid valve (28) are started to cool the evaporator (30) in the temperature and humidity environment chamber (700). As the temperature and humidity environment chamber (700) circulates air through the fan (99), the temperature and humidity environment chamber (700) is cooled and cooled. When the cryogenic compressor (21) is working, if the discharge pressure is too high and exceeds the limit, the fourth solenoid valve (31) will be opened to relieve the pressure. At the same time, the third solenoid valve (28) will be closed according to the duty cycle. When the evaporator (30) of the temperature and humidity environment chamber (700) is adjusting its energy, if the temperature and humidity environment chamber (700) is closed, the third expansion valve (26) can supply some refrigerant to the cryogenic compressor (21). If the return gas pressure of the cryogenic compressor (21) is too low, the fourth solenoid valve (31) can be opened to supplement some hot refrigerant into the cryogenic compressor (21). When the test specimen (17) requires coolant, the high-temperature compressor (1) and the first solenoid valve (8) are started; at the same time, the coolant circulation pump (16) is started, so that the coolant circulates directly between the first evaporator (10) and the test specimen (17); when adjusting the cooling capacity on the refrigerant side and the cascade intermediate plate, if the first solenoid valve (8) and the second solenoid valve (11) are both closed, the first expansion valve (6) provides part of the refrigerant flow. If the suction pressure of the high-temperature compressor (1) is too low at this time, the bypass valve (18) can be opened to bypass part of the hot refrigerant to the high-temperature compressor (1). When both the temperature and humidity environment chamber (700) and the coolant require cooling capacity, the entire system works simultaneously. At the same time, based on the cooling capacity requirements of the temperature and humidity environment chamber (700) and the coolant side, the opening and closing duty cycles of the first solenoid valve (8) and the third solenoid valve (28) are dynamically adjusted to achieve the purpose of adjusting the cooling capacity on the load side. The second solenoid valve (11) and the second expansion valve (12) control the high-temperature compressor (1) by adjusting the duty cycle or opening degree, so that the dual-stage refrigeration system operates in a suitable pressure range.