A temperature control system

Abstract

The present invention discloses a temperature control system, which includes a circulation tank, at least one load, a compressor, a condenser, and an expansion valve. The circulation tank includes a first liquid inlet, a first liquid outlet, a second air inlet, and a second air outlet, with the first liquid outlet being located at the bottom of the circulation tank; the circulation tank is used to store refrigerant; the load includes an inlet and an outlet, with the inlet being connected to the first liquid outlet, and the outlet being connected to the second air inlet; the compressor includes an air inlet and an exhaust, with the air inlet being connected to the second air outlet; the condenser includes a condensation inlet and a condensation outlet, with the condensation inlet being connected to the exhaust; and the expansion valve is connected to the condensation outlet and the first liquid inlet, respectively. The technical solution of the present invention can improve the cooling consistency and uniformity of the temperature control system on the load, thereby improving the cooling effect of the temperature control system on the load.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control, and in particular to a temperature control system. Background Art

[0002] Temperature control systems typically consist of a compressor, condenser, evaporator, expansion valve, and evaporator. These systems are widely used in equipment such as air conditioners and refrigerators. Because components in some industrial equipment generate heat during operation, this heat can affect their performance. Therefore, it's necessary to adjust the operating temperature of these components to prevent high temperatures from affecting their performance.

[0003] In the prior art, the above-mentioned device is used as an evaporator in the temperature control system to form a direct cooling system for directly adjusting the temperature of the device. However, the liquid outlet of the expansion valve in this system is directly connected to the device, and when the refrigerant passes through the expansion valve, due to the sudden drop in pressure, some molecules inside the refrigerant liquid obtain sufficient energy and are quickly converted into gas. As a result, the refrigerant entering the device includes gas and liquid, resulting in inconsistent cooling effect of the refrigerant on the surface of the device, thereby affecting the uniformity and reliability of the control of the device temperature. Summary of the Invention

[0004] The present invention provides a temperature control system, which can improve the cooling consistency and uniformity of the temperature control system on a load, thereby improving the cooling effect of the temperature control system on the load.

[0005] The present invention provides a temperature control system, comprising:

[0006] A circulation tank comprising a first liquid inlet, a first liquid outlet, a second air inlet, and a second air outlet, wherein the first liquid outlet is located at the bottom of the circulation tank; the circulation tank is used to store refrigerant;

[0007] at least one load, comprising an inlet and an outlet; the inlet being in communication with the first liquid outlet, and the outlet being in communication with the second gas inlet;

[0008] The compressor comprises an air inlet and an air outlet; the air inlet is connected to the second air outlet;

[0009] a condenser, comprising a condensation inlet and a condensation outlet, wherein the condensation inlet is communicated with the exhaust port;

[0010] An expansion valve is connected to the condensation outlet and the first liquid inlet respectively.

[0011] Optionally, the temperature control system also includes:

[0012] A pressure detection device is located in the circulation tank; the pressure detection device is used to obtain a first pressure of the refrigerant located in the circulation tank;

[0013] A controller is electrically connected to the pressure detection device, the compressor and the expansion valve respectively; the controller is used to determine the set pressure in the circulation tank according to the required cooling temperature of each load; determine the required frequency of the compressor according to the first pressure and the set pressure, or determine the required opening of the expansion valve, and control the compressor to operate at the required frequency, or control the expansion valve to be at the required opening.

[0014] Optionally, the controller is specifically configured to:

[0015] The minimum value of the required cooling temperatures is used as the set temperature;

[0016] According to the mapping relationship between temperature and pressure, the pressure corresponding to the set temperature is used as the set pressure.

[0017] Optionally, the controller is specifically configured to:

[0018] determining a pressure difference between the first pressure and the set pressure and an absolute value of the pressure difference according to the first pressure and the set pressure;

[0019] Determining whether the absolute value of the pressure difference is greater than a preset pressure difference;

[0020] If so, a first required frequency of the compressor is determined according to the pressure difference and the current operating frequency of the compressor, and the compressor is controlled to operate at the first required frequency.

[0021] Optionally, if the absolute value of the pressure difference is less than or equal to the preset pressure difference, the required opening of the expansion valve is determined based on the pressure difference and the current opening of the expansion valve, and the expansion valve is controlled to be at the required opening.

[0022] Optionally, the temperature control system also includes:

[0023] At least one electrically controlled valve is provided corresponding to each of the loads, and each of the electrically controlled valves is connected to an inlet of each of the loads;

[0024] at least one temperature detection device provided in one-to-one correspondence with each of the loads, the temperature detection device being used to obtain the current temperature of the load;

[0025] The controller is also electrically connected to the electric control valve and each of the temperature detection devices. The controller is also used to control the opening of the electric control valve according to the current temperature to adjust the refrigerant flow entering the load.

[0026] Optionally, the controller is configured to:

[0027] Determining a temperature difference between the current temperature and the preset temperature and an absolute value of the temperature difference according to the current temperature and the preset temperature;

[0028] Determining whether the absolute value of the temperature difference is greater than a preset temperature difference;

[0029] If so, the required operating opening of the electronically controlled valve is determined according to the temperature difference and the current operating opening of the electronically controlled valve, and the electronically controlled valve is controlled to operate at the required operating opening.

[0030] Optionally, the temperature control system also includes:

[0031] a liquid pump, located between the first liquid outlet and each of the inlets;

[0032] The controller is also electrically connected to the liquid pump. The controller is also used to return to the step of determining the temperature difference between the current temperature and the preset temperature and the absolute value of the temperature difference based on the current temperature and the preset temperature after controlling the electronically controlled valve to operate at the required operating opening for a preset time, and to determine whether the absolute value of the temperature difference is greater than the preset temperature difference. If the absolute value of the temperature difference is greater than the preset temperature, the required frequency of the liquid pump is determined based on the temperature difference and the current frequency of the liquid pump, and the liquid pump is controlled to operate at the required frequency.

[0033] Optionally, the temperature control system also includes:

[0034] a flow meter located between the liquid pump and each of the inlets;

[0035] a bypass valve located between the liquid pump and the second air inlet;

[0036] The controller is also electrically connected to the flow meter and the bypass valve, and is further configured to control the working state of the bypass valve according to the current flow rate obtained by the flow meter.

[0037] Optionally, the temperature control system also includes:

[0038] A filter is located between the condenser and the expansion valve.

[0039] The technical solution provided by the present invention incorporates a circulation tank in a temperature control system and positions an expansion valve at the first liquid inlet of the circulation tank. This allows for separation of gaseous and liquid refrigerant supplied by the expansion valve within the circulation tank, with the liquid refrigerant located at the bottom and the gaseous refrigerant at the top. A first liquid outlet, connected to the load inlet, is located at the bottom of the circulation tank to ensure that the refrigerant supplied to the load is entirely liquid, improving the consistency and uniformity of the refrigerant's cooling of the load and, consequently, enhancing the cooling effect of the temperature control system on the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic structural diagram of a temperature control system provided by an embodiment of the present invention;

[0041] Figure 2 A schematic structural diagram of another temperature control system provided by an embodiment of the present invention;

[0042] Figure 3 A schematic structural diagram of another temperature control system provided by an embodiment of the present invention;

[0043] Figure 4 A schematic structural diagram of another temperature control system provided by an embodiment of the present invention;

[0044] Figure 5 A schematic structural diagram of a temperature control system provided by an embodiment of the present invention;

[0045] Figure 6 A schematic structural diagram of another temperature control system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0047] Figure 1 A schematic diagram of a temperature control system provided by an embodiment of the present invention is shown in FIG. Figure 1As shown, the temperature control system includes a circulation tank 10, at least one load 20, a compressor 30, a condenser 40, and an expansion valve 50. The circulation tank 10 includes a first liquid inlet A1, a first liquid outlet B1, a second air inlet A2, and a second air outlet B2. The first liquid outlet B1 is located at the bottom of the circulation tank 10; the circulation tank 10 is used to store refrigerant. There is at least one load 20, and the load 20 includes an inlet and an outlet. The inlet is connected to the first liquid outlet B1, and the outlet is connected to the second air inlet A2. The compressor 30 includes an air inlet and an outlet. The air inlet is connected to the second air outlet B2. The condenser 40 includes a condensation inlet and a condensation outlet. The condensation inlet is connected to the exhaust port. The expansion valve 50 is connected to the condensation outlet and the first liquid inlet A1, respectively.

[0048] The load 20 may include a cooling pipeline connecting an inlet and an outlet. The cooling pipeline may surround the heat-generating portion of the load 20, so that when the refrigerant passes through the cooling pipeline, it can exchange heat with the heat-generating portion of the load 20, thereby reducing the temperature of the load 20. The load 20 can be configured as needed. Exemplarily, the load includes semiconductor chips, etc., but other loads are also possible and are not specifically limited herein. The refrigerant may include Freon, etc. The circulation tank 10 may be made of stainless steel or an alloy, etc. The expansion valve 50 may include an electromagnetic electronic expansion valve or an electric electronic expansion valve, etc.

[0049] Specifically, the refrigerant in the circulation tank 10 enters the compressor 30 through the second gas outlet B2. The compressor 30 converts the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure refrigerant gas. The high-temperature, high-pressure refrigerant gas is cooled in the condenser 40 to form a low-temperature, medium-pressure refrigerant liquid. After throttling and reducing the pressure of the expansion valve 50, it becomes a low-temperature, low-pressure refrigerant liquid. The low-temperature, low-pressure refrigerant liquid enters the circulation tank 10 and enters each load 20 through the first liquid outlet B1. The low-temperature, low-pressure refrigerant absorbs heat and evaporates in the load 20, outputting a low-temperature, low-pressure refrigerant gas. The low-temperature, low-pressure refrigerant gas enters the circulation tank 10 through the second gas inlet A2. This process is repeated to achieve cooling of the load 20. By disposing the circulation tank 10 and the expansion valve 50 at the first liquid inlet A1 of the circulation tank 10, the gas refrigerant and liquid refrigerant provided by the expansion valve 50 can be separated in the circulation tank 10, with the liquid refrigerant located at the bottom of the circulation tank 10 and the gas refrigerant located at the top of the circulation tank 10. The first liquid outlet B1 is located at the bottom of the circulation tank 10 to ensure that the refrigerant provided to the load 20 is liquid, thereby improving the cooling consistency and uniformity of the refrigerant on the load 20 and further improving the cooling effect on the load 20.

[0050] The technical solution of the embodiment of the present invention is to provide a circulation tank in the temperature control system and position an expansion valve at the first liquid inlet of the circulation tank. This allows the gaseous refrigerant and liquid refrigerant provided by the expansion valve to be separated in the circulation tank, with the liquid refrigerant located at the bottom of the circulation tank and the gaseous refrigerant at the top. The first liquid outlet, which communicates with the load inlet, is located at the bottom of the circulation tank to ensure that the refrigerant supplied to the load is liquid, improving the consistency and uniformity of the refrigerant cooling the load, thereby enhancing the cooling effect of the temperature control system on the load.

[0051] Optional, Figure 2 A schematic diagram of another temperature control system provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, the temperature control system further includes a pressure sensing device PT and a controller 60. The pressure sensing device PT is located in the circulation tank 10 and is used to obtain a first pressure of the refrigerant in the circulation tank 10. The controller 60 is electrically connected to the pressure sensing device PT, the compressor 30, and the expansion valve 50. The controller 60 is used to determine a set pressure in the circulation tank 10 based on the required cooling temperature of each load 20. Based on the first pressure and the set pressure, the controller 60 determines the required frequency of the compressor 30 or the required opening degree of the expansion valve 50, and controls the compressor 30 to operate at the required frequency or to control the expansion valve 50 to the required opening degree.

[0052] The pressure detection device PT includes a piezoresistive pressure sensor, a capacitive pressure sensor, a piezoelectric pressure sensor, etc., and can be configured according to actual needs, which is not specifically limited here.

[0053] Specifically, the required cooling temperatures of each load 20 can be the same or different. When the operating temperature of the load 20 is higher, a refrigerant with the required cooling temperature has a higher cooling efficiency for the load 20. The required cooling temperature can be set based on the actual operating requirements of the load 20 and is not specifically limited here. When the required cooling temperature of each load 20 is the same, the required cooling temperature can be used as the set temperature of the circulation tank 10. The temperature and pressure of the refrigerant in the circulation tank 10 are proportional, that is, the higher the refrigerant pressure, the higher the refrigerant temperature. Based on the corresponding relationship between the refrigerant temperature and pressure, the set pressure corresponding to the set temperature can be determined. The controller 60 obtains the first pressure of the refrigerant in the circulation tank 10 in real time through the pressure detection device PT, compares the first pressure with the set pressure, and adjusts the operating frequency of the compressor 30 or the opening of the expansion valve 50 according to the relationship between the first pressure and the set pressure, so that the first pressure is close to or equal to the set pressure, so that the temperature of the refrigerant in the circulation tank 10 is close to or equal to the required cooling temperature of the load 20, so as to meet the cooling demand of the load 20, improve the cooling efficiency of the refrigerant on the load 20, and prevent the refrigerant temperature from being too high, resulting in the inability to reduce the operating temperature of the load 20 in time.

[0054] Optionally, the controller 60 is specifically configured to: use the minimum value of each required cooling temperature as the set temperature; and use the pressure corresponding to the set temperature as the set pressure according to the mapping relationship between temperature and pressure.

[0055] Specifically, the required cooling temperatures of each load 20 may be the same or different. When at least two loads 20 have different required cooling temperatures, the minimum of the required cooling temperatures can be used as the set temperature to ensure the cooling reliability of each load 20. The mapping relationship can be a temperature-pressure curve graph or a temperature-pressure correspondence table, etc., which can be obtained through experiments or experience. When the mapping relationship is a temperature-pressure curve graph, after obtaining the set temperature, the temperature-pressure curve graph can be directly compared to determine the pressure on the curve graph corresponding to the set temperature as the set pressure. Alternatively, when the mapping relationship is a temperature-pressure correspondence table, after obtaining the set temperature, the table can be directly looked up to obtain the pressure corresponding to the set temperature, and the pressure can be determined as the set pressure.

[0056] It can be understood that the demand frequency of the compressor, or the demand opening of the expansion valve is related to the relationship between the first pressure and the set pressure. In an optional embodiment, the controller 60 is specifically configured to: determine the pressure difference between the first pressure and the set pressure and the absolute value of the pressure difference based on the first pressure and the set pressure; determine whether the absolute value of the pressure difference is greater than the preset pressure difference; if so, determine the first demand frequency of the compressor 30 based on the pressure difference and the current operating frequency of the compressor 30, and control the compressor 30 to operate at the first demand frequency.

[0057] The preset pressure difference may be a fixed value or a non-fixed value, and may be determined according to actual control needs. The preset pressure difference may be in the range of 0 kPa-70 kPa, and for example, the preset pressure difference may be 50 kPa. The pressure difference value may be positive or negative.

[0058] Specifically, the absolute value of the pressure difference indicates the degree of difference between the first pressure and the set pressure. A larger absolute value of the pressure difference indicates a larger degree of difference between the first pressure and the set pressure, and a smaller absolute value of the pressure difference indicates a smaller degree of difference between the first pressure and the set pressure. If the absolute value of the pressure difference is greater than the preset pressure difference, the difference between the first pressure and the set pressure is significant, and adjusting the opening of the expansion valve 50 alone is insufficient to adjust this difference. Therefore, the operating frequency of the compressor 30 needs to be adjusted to reduce the difference between the first pressure and the set pressure. When the absolute value of the pressure difference is greater than the preset pressure difference, the controller 60 can determine whether the pressure difference is greater than zero. If the pressure difference is greater than zero, it indicates that the first pressure is significantly greater than the set pressure. Based on the PID control algorithm, a first demand frequency can be determined based on the current operating frequency and the pressure difference. The first demand frequency is greater than the current operating frequency, so that when the compressor operates at the first demand frequency, the refrigerant pressure supplied to the circulation tank 10 can be reduced, thereby causing the first pressure to approach or reach the set pressure. In this way, when the first pressure differs greatly from the set pressure, the operating frequency of the compressor 30 can be adjusted to quickly adjust the first pressure of the refrigerant in the circulation tank 10, thereby improving the pressure control efficiency.

[0059] Accordingly, when the absolute value of the pressure difference is greater than the preset pressure difference, the controller 60 can determine whether the pressure difference is greater than zero. If the pressure difference is less than zero, it indicates that the first pressure is much less than the set pressure. Based on the PID control algorithm, a first demand frequency can be determined based on the current operating frequency and the pressure difference. The first demand frequency is less than the current operating frequency, so that after the compressor operates at the first demand frequency, the refrigerant pressure provided to the circulation tank 10 can be increased, thereby causing the first pressure to approach or reach the set pressure. In this way, when the difference between the first pressure and the set pressure is large, the operating frequency of the compressor 30 can be adjusted to quickly adjust the first pressure of the refrigerant in the circulation tank 10, thereby improving pressure control efficiency.

[0060] The above description describes the case where the absolute value of the pressure difference is greater than the preset pressure difference. Alternatively, if the absolute value of the pressure difference is less than or equal to the preset pressure difference, the required opening of the expansion valve 50 is determined based on the pressure difference and the current opening of the expansion valve 50, and the expansion valve 50 is controlled to be at the required opening.

[0061] Specifically, if the absolute value of the pressure difference is less than or equal to the preset pressure difference, the difference between the first pressure and the set pressure is small. If the operating frequency of compressor 30 is still adjusted, the difference between the first pressure and the set pressure may increase. Therefore, only the opening of expansion valve 50 needs to be adjusted to further reduce the difference between the first pressure and the set pressure. When the absolute value of the pressure difference is less than or equal to the preset pressure difference, controller 60 can determine whether the pressure difference is greater than zero. If the pressure difference is greater than zero, it indicates that the first pressure is greater than the set pressure. Based on the PID control algorithm, the required opening can be determined based on the current opening and the pressure difference. The required opening is less than the current opening. When the expansion valve 50 is at the required opening, the refrigerant pressure supplied to the circulation tank 10 can be reduced, thereby bringing the first pressure close to or reaching the set pressure. In this way, when the difference between the first pressure and the set pressure is small, the opening of expansion valve 50 can be adjusted to fine-tune the first pressure of the refrigerant in the circulation tank 10, improving the pressure adjustment accuracy.

[0062] Optional, Figure 3 A schematic diagram of the structure of another temperature control system provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the temperature control system also includes at least one electrically controlled valve 70 arranged in a one-to-one correspondence with each load 20, and at least one temperature detection device 21 arranged in a one-to-one correspondence with each load 20, each electrically controlled valve 70 is respectively connected to the inlet of each load 20; the temperature detection device 21 is used to obtain the current temperature of the load 20; the controller 60 is also electrically connected to the electrically controlled valve 70 and each temperature detection device 21, and the controller 60 is also used to control the opening of the electrically controlled valve 70 according to the current temperature to adjust the refrigerant flow entering the load 20.

[0063] The temperature detection device 21 includes a thermocouple sensor, a thermistor sensor, a platinum resistance sensor or an integrated temperature sensor, etc., and can be configured according to actual needs, which is not specifically limited here.

[0064] Specifically, the controller 60 stores the preset temperature for each load 20. When a load 20 is at the preset temperature, the load 20 exhibits better operating performance and reliability. The controller 60 obtains the current temperature of each load 20 via the temperature detection device 21. By comparing the current temperature with the preset temperature, the controller 60 controls the opening of the electronically controlled valve 70 to adjust the refrigerant flow rate entering the load 20, thereby improving the timeliness and reliability of temperature adjustment for the load 20. For example, if the current temperature is greater than the preset temperature, the electronically controlled valve 70 can be opened wider, increasing the refrigerant flow rate through the load 20 and lowering the temperature of the load 20.

[0065] Optionally, the controller 60 is configured to: determine the temperature difference between the current temperature and the preset temperature and the absolute value of the temperature difference based on the current temperature and the preset temperature; determine whether the absolute value of the temperature difference is greater than the preset temperature difference; if so, determine the required operating opening of the electric control valve 70 based on the temperature difference and the current operating opening of the electric control valve, and control the electric control valve 70 to operate at the required operating opening.

[0066] Among them, the preset temperature and the preset temperature difference can be fixed values ​​or non-fixed values, and can be set according to actual needs, and are not specifically limited here.

[0067] Specifically, the absolute value of the temperature difference indicates the degree of difference between the current temperature and the preset temperature. A larger absolute value of the temperature difference indicates a larger degree of difference between the current temperature and the preset temperature, and a smaller absolute value of the temperature difference indicates a smaller degree of difference between the current temperature and the preset temperature. If the absolute value of the temperature difference is greater than the preset pressure difference, it indicates that the current temperature differs significantly from the preset temperature. The controller 60 can then continue to determine whether the temperature difference is greater than zero. If the temperature difference is greater than zero, it indicates that the current temperature is greater than the preset temperature. The controller 60 can then substitute the temperature difference and the current operating opening into a calculation formula for the required operating opening to determine the required operating opening. Alternatively, the required operating opening can be determined based on a corresponding table of the temperature difference, the current operating opening, and the required operating opening. If the required operating opening is greater than the current operating opening, the electronically controlled valve 70 can operate at the required operating opening, thereby increasing the refrigerant flow rate provided to the load 20 and improving the heat exchange efficiency between the refrigerant and the load 20. This allows the current temperature of the load 20 to more quickly approach or equal the preset temperature, thereby improving the efficiency and reliability of temperature control for the load 20.

[0068] Correspondingly, when the absolute value of the temperature difference is greater than the preset pressure difference, the controller 60 can determine whether the temperature difference is greater than zero. If the temperature difference is less than zero, it means that the current temperature is less than the preset temperature. The temperature difference and the current operating opening can be substituted into the calculation formula of the required operating opening to determine the required operating opening, or the required operating opening can be determined based on the corresponding table of the temperature difference, the current operating opening and the required operating opening. The required operating opening is less than the current operating opening, so that after the electric control valve 70 operates at the required operating opening, the refrigerant flow provided to the load 20 can be reduced, the heat exchange efficiency between the refrigerant and the load 20 can be reduced, and the current temperature of the load 20 can be close to or equal to the preset temperature more quickly, thereby improving the temperature adjustment efficiency and temperature adjustment reliability of the load 20.

[0069] Optional, Figure 4 A schematic diagram of the structure of another temperature control system provided by an embodiment of the present invention is shown in FIG. Figure 4As shown, the temperature control system further includes a liquid pump 80. The liquid pump 80 is located between the first liquid outlet B1 and each inlet. The controller 60 is also electrically connected to the liquid pump 80. The controller 60 is further configured to, after controlling the electronically controlled valve 70 to operate at the required operating opening for a preset time, return to the step of determining the temperature difference between the current temperature and the preset temperature and the absolute value of the temperature difference, and then determine whether the absolute value of the temperature difference is greater than the preset temperature difference. If the absolute value of the temperature difference is greater than the preset temperature, the required frequency of the liquid pump 80 is determined based on the temperature difference and the current frequency of the liquid pump 80, and control the liquid pump 80 to operate at the required frequency.

[0070] The liquid pump 80 includes a centrifugal pump, etc. The preset time may be a fixed value. For example, the preset time is 5 minutes, and may be other values, which are not specifically limited here.

[0071] Specifically, after controlling the electronically controlled valve 70 to operate at the required operating opening for a preset time, if the absolute value of the temperature difference between the current temperature of the load 20 and the preset temperature is still greater than the preset temperature difference, it means that the opening of the electronically controlled valve 70 has little effect on the temperature adjustment of the load 20. At this time, the temperature difference and the current frequency of the liquid pump 80 can be substituted into the calculation formula of the required frequency to determine the required frequency at which the refrigerant flow rate can be increased or decreased. After controlling the liquid pump 80 to operate at the required frequency, the refrigerant flow rate flowing through the load 20 can be rapidly increased or decreased, thereby improving the temperature adjustment efficiency and temperature adjustment reliability of the load 20. After controlling the electronically controlled valve 70 to operate at the required operating opening for a preset time, if the absolute value of the temperature difference between the current temperature of the load 20 and the preset temperature is still greater than the preset temperature difference, the controller 60 continues to determine whether the temperature difference is greater than zero. If the temperature difference is greater than zero, it means that the refrigerant flow through the load 20 is small, and the required frequency determined based on the temperature difference and the current frequency is greater than the current frequency. After the liquid pump 80 operates at the required frequency, the refrigerant flow through the load 20 can be rapidly increased, thereby improving the cooling efficiency of the load 20.

[0072] Optional, Figure 5 A schematic diagram of a temperature control system provided by an embodiment of the present invention is shown in FIG. Figure 5 As shown, the temperature control system further includes a flow meter 91 and a bypass valve 92. The flow meter 91 is located between the liquid pump 80 and each inlet; the bypass valve 92 is located between the liquid pump 80 and the second air inlet A2. The controller 60 is also electrically connected to the flow meter 91 and the bypass valve 92. The controller 60 is also configured to control the operating state of the bypass valve 92 based on the current flow rate obtained by the flow meter 91.

[0073] The flow meter 91 includes a differential pressure flow meter, a rotor flow meter, a throttling flow meter or an electromagnetic flow meter, etc., and can be set according to actual needs, and is not specifically limited here.

[0074] Specifically, the bypass valve 92 is usually in a closed state, and the flow meter 91 can obtain the refrigerant flow rate provided by the liquid pump 80 to the load 20 in real time. The controller 60 stores the flow rate lower limit value of the liquid pump 80 and the frequency lower limit value corresponding to the flow rate lower limit value. If the demand frequency determined based on the temperature difference and the current frequency is less than the frequency lower limit value, the flow rate corresponding to the demand frequency can be used as the set flow rate, and the current flow rate difference between the current flow rate obtained by the flow meter 91 and the set flow rate is calculated. Based on the correspondence between the flow rate difference and the bypass valve opening, the bypass valve opening corresponding to the current flow rate difference is used as the operating opening of the bypass valve 92. The bypass valve 92 is controlled to operate at the operating opening, so that a portion of the refrigerant provided by the liquid pump 80 returns to the circulation tank 10 through the bypass valve 92, and the other portion flows through the load 20, thereby improving the adjustment accuracy of the refrigerant flow rate flowing through the load 20, thereby improving the temperature control accuracy and reliability of the load 20.

[0075] Optional, Figure 6 A schematic diagram of another temperature control system provided by an embodiment of the present invention is shown in FIG. Figure 6 As shown, the temperature control system further includes a filter 93 located between the condenser 40 and the expansion valve 50 .

[0076] Specifically, the filter 93 is used to filter impurities in the refrigerant, improve the cleanliness of the refrigerant flowing through the expansion valve 50, prevent problems such as clogging of the expansion valve 50, and improve the circulation stability of the refrigerant in the temperature control system.

[0077] Optional, continue to refer to Figure 6 The temperature control system also includes an oil separator 94, an oil cooler 95, and an oil return solenoid valve 96. The oil separator 94 is located between the compressor 30 and the condenser 40. Its oil outlet communicates with the compressor 30, while its refrigerant outlet communicates with the condenser 40. The oil separator 94 is used to separate lubricating oil from the refrigerant and supply the separated lubricating oil to the compressor 30 to lubricate components therein and improve the cleanliness of the refrigerant supplied to the condenser 40. The oil cooler 95 includes a refrigerant inlet, a refrigerant outlet, a lubricating oil inlet, and a lubricating oil outlet. The refrigerant inlet communicates with the condenser outlet of the condenser, the refrigerant outlet communicates with the inlet of the filter 93, the lubricating oil inlet communicates with the oil return solenoid valve 96, and the lubricating oil outlet communicates with the compressor 30. The other end of the oil return solenoid valve 96 communicates with the circulation tank 10. The oil return solenoid valve 96 supplies the lubricating oil separated from the circulation tank 10 to the oil cooler 95, where it is then cooled and returned to the compressor 30.

[0078] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A temperature control system, characterized in that: include: A circulation tank comprising a first liquid inlet, a first liquid outlet, a second air inlet and a second air outlet, wherein the first liquid outlet is located at the bottom of the circulation tank; The circulation tank is used to store refrigerant; at least one load, comprising an inlet and an outlet; the inlet being in communication with the first liquid outlet, and the outlet being in communication with the second gas inlet; The compressor comprises an air inlet and an air outlet; the air inlet is connected to the second air outlet; a condenser, comprising a condensation inlet and a condensation outlet, wherein the condensation inlet is communicated with the exhaust port; an expansion valve, connected to the condensation outlet and the first liquid inlet respectively; The temperature control system further comprises: A pressure detection device is located in the circulation tank; the pressure detection device is used to obtain a first pressure of the refrigerant located in the circulation tank; A controller is electrically connected to the pressure detection device, the compressor and the expansion valve respectively; the controller is used to determine the set pressure in the circulation tank according to the required cooling temperature of each load; determine the required frequency of the compressor according to the first pressure and the set pressure, or determine the required opening of the expansion valve, and control the compressor to operate at the required frequency, or control the expansion valve to be at the required opening.

2. The temperature control system according to claim 1, characterized in that: The controller is specifically configured to: The minimum value of the required cooling temperatures is used as the set temperature; According to the mapping relationship between temperature and pressure, the pressure corresponding to the set temperature is used as the set pressure.

3. The temperature control system according to claim 1, characterized in that: The controller is specifically configured to: determining a pressure difference between the first pressure and the set pressure and an absolute value of the pressure difference according to the first pressure and the set pressure; Determining whether the absolute value of the pressure difference is greater than a preset pressure difference; If so, a first required frequency of the compressor is determined according to the pressure difference and the current operating frequency of the compressor, and the compressor is controlled to operate at the first required frequency.

4. The temperature control system according to claim 3, characterized in that: If the absolute value of the pressure difference is less than or equal to the preset pressure difference, the required opening of the expansion valve is determined according to the pressure difference and the current opening of the expansion valve, and the expansion valve is controlled to be at the required opening.

5. The temperature control system according to claim 1, characterized in that: Also includes: At least one electrically controlled valve is provided corresponding to each of the loads, and each of the electrically controlled valves is connected to an inlet of each of the loads; at least one temperature detection device provided in one-to-one correspondence with each of the loads, the temperature detection device being used to obtain the current temperature of the load; The controller is also electrically connected to the electric control valve and each of the temperature detection devices. The controller is also used to control the opening of the electric control valve according to the current temperature to adjust the refrigerant flow entering the load.

6. The temperature control system according to claim 5, characterized in that: The controller is configured to: Determining a temperature difference between the current temperature and the preset temperature and an absolute value of the temperature difference according to the current temperature and the preset temperature; Determining whether the absolute value of the temperature difference is greater than a preset temperature difference; If so, the required operating opening of the electronically controlled valve is determined according to the temperature difference and the current operating opening of the electronically controlled valve, and the electronically controlled valve is controlled to operate at the required operating opening.

7. The temperature control system according to claim 6, characterized in that: Also includes: a liquid pump, located between the first liquid outlet and each of the inlets; The controller is also electrically connected to the liquid pump. The controller is also used to return to the step of determining the temperature difference between the current temperature and the preset temperature and the absolute value of the temperature difference based on the current temperature and the preset temperature after controlling the electronically controlled valve to operate at the required operating opening for a preset time, and to determine whether the absolute value of the temperature difference is greater than the preset temperature difference. If the absolute value of the temperature difference is greater than the preset temperature, the required frequency of the liquid pump is determined based on the temperature difference and the current frequency of the liquid pump, and the liquid pump is controlled to operate at the required frequency.

8. The temperature control system according to claim 7, characterized in that: Also includes: a flow meter located between the liquid pump and each of the inlets; a bypass valve located between the liquid pump and the second air inlet; The controller is also electrically connected to the flow meter and the bypass valve, and is further configured to control the working state of the bypass valve according to the current flow rate obtained by the flow meter.

9. The temperature control system according to claim 1, characterized in that: Also includes: A filter is located between the condenser and the expansion valve.

Images