Dual-pump temperature control system with cold storage function for laser and control method thereof

Abstract

This invention discloses a dual-pump temperature control system with cold storage function for lasers and its control method. The dual-pump temperature control system with cold storage function for lasers includes a PID controller, a cold / heat storage system, and a temperature control and adjustment system. The input terminal of the PID controller is connected to a parameter input module. The cold / heat storage system includes a cold storage tank, a cold / heat exchange component for cooling the refrigerant in the cold storage tank to store cold or heating it to store heat, and an internal circulation pump for inputting the refrigerant in the cold storage tank into the cold / heat exchange component for cold / heat exchange. The temperature control and adjustment system is used to supply liquid to the target for cooling or heating according to the target liquid supply parameters set by the parameter input module and controlled and adjusted by the PID controller. This dual-pump temperature control system with cold storage function for lasers and its control method can directly remove the instantaneous heat generated by high-power equipment in a very short time, and it is simple to configure, low in cost, and has high control accuracy.

Description

Technical Field

[0001] This invention relates to the field of laser cooling and temperature control technology, specifically to a dual-pump temperature control system with cold storage function for lasers and its control method. Background Technology

[0002] Poor heat dissipation is one of the main reasons for the temperature rise of lasers. Lasers generate a lot of heat during operation, and if this heat cannot be dissipated in time, the temperature will rise, affecting the normal operation of the laser.

[0003] Therefore, it is necessary to provide a large amount of cold energy in a short period of time to cool the laser and ensure its normal operation. However, providing instantaneous cooling would result in a large cooling system with high volume and cost, making it impractical for real-world engineering applications. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] Therefore, the purpose of this invention is to provide a dual-pump temperature control system with cold storage function for lasers and its control method. The stored cold energy can directly remove the instantaneous heat generated when high-power equipment is working in a very short time. Moreover, it is simple to configure, low in cost, and has high control precision.

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0007] A dual-pump temperature control system for lasers with cold storage function, comprising:

[0008] A PID controller, whose input terminal is connected to a parameter input module;

[0009] A cold / heat storage system includes a cold storage tank, a cold / heat exchange assembly for cooling the refrigerant in the cold storage tank to store cold or heating the refrigerant in the cold storage tank to store heat, and an internal circulation pump for inputting the refrigerant in the cold storage tank into the cold / heat exchange assembly for heat storage to exchange cold and heat.

[0010] The temperature control system is used to cool or heat the target liquid supply based on the target liquid supply parameters set by the parameter input module and controlled and adjusted by the PID controller.

[0011] In this system, the liquid in the temperature control system exchanges heat with the refrigerant in the cold storage bag to cool or heat the target.

[0012] As a preferred embodiment of the dual-pump temperature control system with cold storage function for lasers described in this invention, the cold / heat exchange component includes a compressor, a four-way valve whose inlet is connected to the outlet end of the compressor, a condenser whose one end is connected to the first outlet end of the four-way valve, an electronic expansion valve whose one end is connected to the other end of the condenser, a first evaporator, and a second evaporator.

[0013] Among them, the first refrigerant connection port of the first evaporator is connected to the outlet end of the internal circulation pump, the second refrigerant connection port of the first evaporator is connected to the third refrigerant connection port of the second evaporator, the first refrigerant connection port of the first evaporator is connected to the second outlet end of the four-way valve, and the second refrigerant port of the first evaporator is connected to the other end of the electronic expansion valve.

[0014] The fourth refrigerant connection port of the second evaporator is connected to the refrigerant inlet of the cold storage bag;

[0015] The third outlet of the four-way valve is connected to the inlet of the compressor via a pipe.

[0016] As a preferred embodiment of the dual-pump temperature control system with cold storage function for lasers described in this invention, the cold / heat exchange component further includes a drying filter located between the electronic expansion valve and the condenser.

[0017] As a preferred embodiment of the dual-pump temperature control system with cold storage function for lasers described in this invention, the temperature control system includes an external circulation pump whose input end is connected to the exchange liquid circulation outlet of the second evaporator, a flow meter whose output end is connected to the output end of the external circulation pump, a liquid supply pipe whose other end is connected to the other end of the flow meter and connected to the target liquid supply inlet, and a liquid return pipe whose other end is connected to the target liquid return outlet and the other end is connected to the exchange liquid circulation inlet of the second evaporator.

[0018] A solenoid valve is connected between the liquid supply pipe and the liquid return pipe.

[0019] As a preferred embodiment of the dual-pump temperature control system with cold storage function for lasers described in this invention, a liquid supply temperature sensor is provided on the liquid supply pipe and a liquid return temperature sensor is provided on the liquid return pipe.

[0020] The PID controller is electrically connected to the internal circulation pump, the external circulation pump, the flow meter, the supply liquid temperature sensor, and the return liquid temperature sensor, respectively.

[0021] As a preferred embodiment of the dual-pump temperature control system with cold storage function for lasers described in this invention, the cold storage package is equipped with a cold storage package temperature sensor electrically connected to the PID controller.

[0022] A control method for a dual-pump temperature control system with cold storage function for lasers, the specific steps of which are as follows:

[0023] S1, Cold Storage Mode: The internal circulation pump starts circulating, continuously delivering the refrigerant in the cold storage tank to the first evaporator. At the same time, the compressor starts, and the refrigerant, after being compressed by the compressor, becomes a high-temperature, high-pressure gaseous refrigerant. It passes through the four-way valve and enters the condenser to dissipate heat. After dissipation, it passes through the dryer filter and flows to the electronic expansion valve. The throttled refrigerant exchanges heat with the refrigerant in the first evaporator, cooling the refrigerant. After cooling, the refrigerant returns to the cold storage tank through the second evaporator to store cold, while the refrigerant that has absorbed heat returns to the compressor, completing the cold storage cycle.

[0024] S2, Cooling Mode: Based on the target liquid supply flow rate Q set by the parameter input module, the PID controller calculates and outputs the frequency of the external circulation pump to ensure the liquid supply flow rate. Based on the target liquid supply temperature T1 set by the parameter input module and the actual liquid supply temperature T3 collected by the liquid supply temperature sensor, the PID controller calculates and outputs the frequency of the internal circulation pump. At this time, the refrigerant in the cold storage tank is continuously delivered to the first evaporator. Then, the refrigerant enters the second evaporator to exchange with the exchange liquid. After exchanging with the refrigerant, the exchange liquid carries the cooling capacity through the external circulation... The continuous delivery of the circulating pump passes through the flow meter and the liquid supply pipeline to cool the target. Then, it re-enters the second evaporator through the return pipeline to continue heat exchange with the refrigerant. The refrigerant after exchanging with the exchange liquid flows back to the cold storage tank. When the cooling mode ends, the temperature of the cold storage tank rises and it re-enters the cold storage. The initial opening percentage X1 of the internal circulation pump is given by the parameter input module. When the absolute value of the deviation between the actual liquid supply temperature T3 and the target liquid supply temperature T1, i.e., |T3-T1|≤1, the PID controller adjusts autonomously.

[0025] S3, Heating Mode: When heating is required, the internal circulation pump starts, continuously supplying the refrigerant from the cold storage tank to the first evaporator. Simultaneously, the compressor starts, and the four-way valve switches the internal flow direction. The high-temperature, high-pressure refrigerant enters the first evaporator through the four-way valve, exchanging heat with the refrigerant and heating the circulating refrigerant. After the refrigerant dissipates heat, it is throttled by the electronic expansion valve. The throttled refrigerant then enters the condenser to absorb heat, and returns to the compressor, completing the heating cycle. Simultaneously, based on the target liquid supply flow rate Q set by the parameter input module, the PID controller calculates and outputs the frequency of the external circulation pump to ensure the liquid supply flow rate. Based on the target supply liquid temperature T1 set by the parameter input module and the return liquid temperature T2 collected by the return liquid temperature sensor, the PID controller calculates and outputs the frequency of the internal circulation pump. At this time, the heat-carrying refrigerant that has exchanged heat with the high-temperature refrigerant in the first evaporator enters the second evaporator to exchange heat with the exchange liquid. After exchanging heat with the refrigerant, the exchange liquid carries heat and is continuously transported by the external circulation pump through the flow meter and the supply liquid pipeline to heat the target. Then, it re-enters the second evaporator through the return liquid pipeline to continue exchanging heat with the refrigerant. The refrigerant that has exchanged heat with the exchange liquid flows back to the cold storage tank.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. By storing cold energy, it is possible to store cold energy even when there is no need for cooling, and then force convection circulation through plate heat exchangers, resulting in higher circulation efficiency.

[0028] 2. By giving an initial internal circulation pump opening, a large amount of low-temperature cold source and hot fluid can be supplied for heat exchange instantly. In a short time, the supply liquid temperature can be stabilized within the target deviation to avoid the loss of cold energy caused by temperature overshoot.

[0029] 3. By adjusting the circulation rate of the cold fluid through PID control, the supply temperature can be kept within the deviation range.

[0030] 4. In cases where heating is required at low temperatures, the heat source can be provided through the refrigerant circulation system by switching the refrigerant circulation system. This method is more efficient than electric heating. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0032] Figure 1This is a schematic diagram of the structure of a dual-pump temperature control system with cold storage function for lasers according to the present invention. Detailed Implementation

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0036] This invention provides a dual-pump temperature control system with cold storage function for lasers and its control method. The stored cold energy can directly remove the instantaneous heat generated when high-power equipment is working in a very short time. It is simple to configure, low in cost, and has high control precision. Example

[0037] A dual-pump temperature control system for lasers with cold storage function, comprising:

[0038] The PID controller 100 has a parameter input module 110 connected to its input terminal for manually inputting initial parameter conditions.

[0039] The cold / heat storage system 200 includes a cold storage tank 210, a cold / heat exchange assembly for cooling the refrigerant in the cold storage tank 210 to store cold or heating it to store heat, and an internal circulation pump 220 for inputting the refrigerant in the cold storage tank 210 into the cold / heat exchange assembly for cold / heat exchange. Specifically, in this embodiment, the cold / heat exchange assembly includes a compressor 230, a four-way valve 240 whose inlet is connected to the outlet end of the compressor 230, a condenser 250 whose first end is connected to the first outlet end of the four-way valve 240, and an electric motor whose other end is connected to the other end of the condenser 250. The system comprises an expansion valve 260, a first evaporator 270, and a second evaporator 280. The first refrigerant connection port 270a of the first evaporator 270 is connected to the outlet of the internal circulation pump 220; the second refrigerant connection port 270b of the first evaporator 270 is connected to the third refrigerant connection port 280a of the second evaporator 280; the first refrigerant connection port 270c of the first evaporator 270 is connected to the second outlet of the four-way valve 240; and the second refrigerant port 270d of the first evaporator 270 is connected to the other end of the electronic expansion valve 260. The fourth refrigerant connection port 280b of the second evaporator 280 is connected to the refrigerant inlet of the cold storage tank 210, and the third outlet of the four-way valve 240 is connected to the inlet of the compressor 230 through a pipe. Preferably, the cold / heat exchange assembly also includes a dryer filter 290 located between the electronic expansion valve 260 and the condenser 250. In actual use, the internal circulation pump 220 starts to circulate, continuously delivering the refrigerant in the cold storage tank 210 to the first evaporator 270. At the same time, the compressor 230 starts, and the refrigerant, after being compressed by the compressor 230, becomes... The high-temperature, high-pressure gaseous refrigerant passes through the four-way valve 240 and enters the condenser 250 for heat dissipation. After heat dissipation, it passes through the dryer filter 290 and is throttled by the electronic expansion valve 260. The throttled refrigerant exchanges heat with the heat transfer fluid in the first evaporator 270, cooling the heat transfer fluid. After cooling, the heat transfer fluid returns to the cold storage tank 210 through the second evaporator 280 for cold storage, while the heat-absorbing refrigerant returns to the compressor 230, completing the cold storage cycle. Preferably, the cold storage tank 210 is equipped with a cold storage tank temperature sensor 210a that is electrically connected to the PID controller 100.

[0040] The temperature control system 300 is used to cool or heat the target liquid supply according to the target liquid supply parameters set by the parameter input module 110 and controlled by the PID controller 100. Specifically, the liquid in the temperature control system 300 exchanges heat with the refrigerant in the cold storage tank 210 in the cold / heat storage system 200 to cool or heat the target liquid supply. The temperature control system 300 includes an external circulation pump 310 whose input end is connected to the exchange liquid circulation outlet 280c of the second evaporator 280; a flow meter 320 whose output end is connected to the output end of the external circulation pump 310; a liquid supply pipe 330 whose other end is connected to the target liquid supply inlet; and a return liquid pipe 340 whose other end is connected to the target return liquid outlet and the exchange liquid circulation inlet 280d of the second evaporator 280. A liquid supply temperature sensor 330a is installed on the liquid supply pipe 330. A return liquid temperature sensor 340a is installed on the device. The PID controller 100 is electrically connected to the internal circulation pump 220, the external circulation pump 310, the flow meter 320, the supply liquid temperature sensor 330a, and the return liquid temperature sensor 340a. In actual use, after the exchange liquid exchanges with the refrigerant, it carries the cold / heat through the continuous delivery of the external circulation pump 310, passing through the flow meter 320 and the supply liquid pipe 330 to cool or heat the target. Then, it re-enters the second evaporator 280 through the return liquid pipe 340 to continue exchanging with the refrigerant. A solenoid valve 350 is connected between the supply liquid pipe 330 and the return liquid pipe 340. When heating or cooling the target, the solenoid valve 350 is opened, allowing the liquid flowing out of the return liquid pipe 340 to enter the supply liquid pipe 330 through the solenoid valve 350 and mix with the liquid in the supply liquid pipe 330, thus more precisely regulating the amount of cold or heat supplied to the target by the supply liquid pipe 330. Example

[0041] The present invention also provides a control method for a dual-pump temperature control system with cold storage function for lasers, the specific steps of which are as follows:

[0042] S1, Cold Storage Mode: The internal circulation pump 220 starts circulation, continuously delivering the refrigerant in the cold storage tank 210 to the first evaporator 270. At the same time, the compressor 230 starts, and the refrigerant, after being compressed by the compressor 230, becomes a high-temperature and high-pressure gaseous refrigerant. It passes through the four-way valve 240 and enters the condenser 250 to dissipate heat. After dissipation, it passes through the dryer filter 290 and is throttled by the electronic expansion valve 260. The throttled refrigerant exchanges heat with the refrigerant in the first evaporator 270 to cool the refrigerant. After cooling, the refrigerant returns to the cold storage tank 210 through the second evaporator 280 to store cold, while the refrigerant that has absorbed heat returns to the compressor 230, completing the cold storage cycle.

[0043] S2, Cooling Mode: Based on the target liquid supply flow rate Q set by the parameter input module 110, the PID controller 100 calculates and outputs the frequency of the external circulation pump 310 to ensure the liquid supply flow rate. Based on the target liquid supply temperature T1 set by the parameter input module 110 and the actual liquid supply temperature T3 collected by the liquid supply temperature sensor 330a, the PID controller 100 calculates and outputs the frequency of the internal circulation pump 220. At this time, the refrigerant in the cold storage tank 210 is continuously delivered to the first evaporator 270. Then, the refrigerant enters the second evaporator 280 to exchange with the exchange liquid. After exchanging with the refrigerant, the exchange liquid carries the cooling capacity through the external circulation pump. The continuous delivery of 310 passes through the flow meter 320 and the liquid supply pipe 330 to cool the target. Then, it re-enters the second evaporator 280 through the return liquid pipe 340 to continue heat exchange with the refrigerant. The refrigerant after exchanging with the exchange liquid flows back to the cold storage tank 210. When the cooling mode ends, the temperature of the cold storage tank 210 rises and it re-enters the cold storage tank 210. The initial opening percentage X1 of the internal circulation pump 220 is given by the parameter input module 110. When the absolute value of the deviation between the actual liquid supply temperature T3 and the target liquid supply temperature T1, i.e., |T3-T1|≤1, the PID controller 100 adjusts autonomously.

[0044] S3, Heating Mode: When heating is required, the internal circulation pump 220 starts, continuously supplying the refrigerant in the cold storage tank 210 to the first evaporator 270. Simultaneously, the compressor 230 starts, and the four-way valve 240 switches the internal flow direction. The high-temperature, high-pressure refrigerant enters the first evaporator 270 through the four-way valve 240, exchanging heat with the refrigerant and heating the circulating refrigerant. After the refrigerant dissipates heat, it is throttled by the electronic expansion valve 260. The throttled refrigerant then enters the condenser 250 to absorb heat, and returns to the compressor 230, completing the heating cycle. Simultaneously, based on the target liquid supply flow rate Q set by the parameter input module 110, the PID controller 100 calculates and outputs the frequency of the external circulation pump 310 to ensure the liquid supply flow rate... Based on the target liquid supply temperature T1 set by the parameter input module 110 and the return liquid temperature T2 collected by the return liquid temperature sensor 350a, the PID controller 100 calculates and outputs the frequency of the internal circulation pump 220. At this time, the heat-carrying refrigerant that has exchanged heat with the high-temperature refrigerant in the first evaporator 270 enters the second evaporator 280 to exchange heat with the exchange liquid. After exchanging heat with the refrigerant, the exchange liquid carries heat and is continuously transported by the external circulation pump 310 through the flow meter 320 and the liquid supply pipe 330 to heat the target. Then, it re-enters the second evaporator 280 through the return liquid pipe 340 to continue to exchange heat with the refrigerant. The refrigerant that has exchanged heat with the exchange liquid flows back to the cold storage tank 210.

[0045] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A dual-pump temperature control system with cold storage function for lasers, characterized in that, include: A PID controller (100) has a parameter input module (110) connected to its input terminal. The cold / heat storage system (200) includes a cold storage tank (210), a cold / heat exchange assembly for cooling the refrigerant in the cold storage tank (210) to store cold or heating the refrigerant to store heat, and an internal circulation pump (220) for inputting the refrigerant in the cold storage tank (210) into the heat storage cold / heat exchange assembly for cold / heat exchange. The temperature control system (300) is used to cool down or heat up the target liquid supply according to the target liquid supply parameters set by the parameter input module (110) and controlled and adjusted by the PID controller (100). In this system, the liquid in the temperature control system (300) and the refrigerant in the cold storage bag (210) exchange heat in the cold storage / heat storage system (200) to supply liquid to cool down or supply liquid to heat up the target. The cold / heat exchange assembly includes a compressor (230), a four-way valve (240) whose inlet is connected to the outlet end of the compressor (230), a condenser (250) whose one end is connected to the first outlet end of the four-way valve (240), an electronic expansion valve (260) whose one end is connected to the other end of the condenser (250), a first evaporator (270), and a second evaporator (280). Among them, the first refrigerant connection port (270a) of the first evaporator (270) is connected to the outlet end of the internal circulation pump (220), the second refrigerant connection port (270b) of the first evaporator (270) is connected to the third refrigerant connection port (280a) of the second evaporator (280), the first refrigerant connection port (270c) of the first evaporator (270) is connected to the second outlet end of the four-way valve (240), and the second refrigerant port (270d) of the first evaporator (270) is connected to the other end of the electronic expansion valve (260); The fourth refrigerant connection port (280b) of the second evaporator (280) is connected to the refrigerant inlet of the cold storage tank (210); The third outlet of the four-way valve (240) is connected to the inlet of the compressor (230) via a pipe; The cold / heat exchange assembly also includes a dryer filter (290) located between the electronic expansion valve (260) and the condenser (250).

2. The dual-pump temperature control system for lasers with cold storage function according to claim 1, characterized in that, The temperature control system (300) includes an external circulation pump (310) whose input end is connected to the exchange liquid circulation outlet (280c) of the second evaporator (280), a flow meter (320) whose output end is connected to the external circulation pump (310), a supply pipe (330) whose other end is connected to the target supply liquid inlet, and a return pipe (340) whose one end is connected to the target return liquid outlet and whose other end is connected to the exchange liquid circulation inlet (280d) of the second evaporator (280). A solenoid valve (350) is connected between the liquid supply pipe (330) and the liquid return pipe (340).

3. A dual-pump temperature control system for lasers with cold storage function according to claim 2, characterized in that, A liquid supply temperature sensor (330a) is installed on the liquid supply pipe (330), and a liquid return temperature sensor (340a) is installed on the liquid return pipe (340). The PID controller (100) is electrically connected to the internal circulation pump (220), the external circulation pump (310), the flow meter (320), the liquid supply temperature sensor (330a), and the liquid return temperature sensor (340a), respectively.

4. A dual-pump temperature control system for lasers with cold storage function according to claim 1, characterized in that, The cold storage bag (210) is equipped with a cold storage bag temperature sensor (210a) that is electrically connected to the PID controller (100).

5. A control method for a dual-pump temperature control system with cold storage function for lasers as described in any one of claims 1-4, characterized in that, The specific steps are as follows: S1, Cold Storage Mode: The internal circulation pump (220) starts circulation, continuously delivering the refrigerant in the cold storage tank (210) to the first evaporator (270). At the same time, the compressor (230) starts, and the refrigerant becomes a high-temperature and high-pressure gaseous refrigerant after being compressed by the compressor (230). It passes through the four-way valve (240) and enters the condenser (250) for heat dissipation. After heat dissipation, it passes through the dryer filter (290) to the electronic expansion valve (260) for throttling. The throttled refrigerant exchanges heat with the refrigerant in the first evaporator (270) to cool the refrigerant. After cooling, the refrigerant passes through the second evaporator (280) and returns to the cold storage tank (210) for cold storage. The refrigerant that has absorbed heat returns to the compressor (230), completing the cold storage cycle. S2, Cooling Mode: Based on the target liquid supply flow rate Q set by the parameter input module (110), the frequency of the external circulation pump (310) is output after calculation by the PID controller (100) to ensure the liquid supply flow rate. Based on the target liquid supply temperature T1 set by the parameter input module (110) and the actual liquid supply temperature T3 collected by the liquid supply temperature sensor (330a), the frequency of the internal circulation pump (220) is output after calculation by the PID controller (100). At this time, the refrigerant in the cold storage bag (210) is continuously transported to the first evaporator (270). Then, the refrigerant enters the second evaporator (280) to exchange with the exchange liquid. After the exchange liquid exchanges with the refrigerant, it carries the cooling capacity through the external circulation pump (270). The continuous delivery of the circulating pump (310) passes through the flow meter (320) and the liquid supply pipe (330) to cool the target. Then, it re-enters the second evaporator (280) through the return pipe (340) to continue heat exchange with the refrigerant. The refrigerant after exchanging with the exchange liquid flows back to the cold storage bag (210). When the cooling mode ends, the temperature of the cold storage bag (210) rises and it re-enters the cold storage. The initial opening percentage X1 of the internal circulating pump (220) is given by the parameter input module (110). When the absolute value of the deviation between the actual liquid supply temperature T3 and the target liquid supply temperature T1, i.e. |T3-T1|≤1, the PID controller (100) adjusts autonomously. S3, Heating Mode: When heating is required, the internal circulation pump (220) is turned on, continuously supplying the refrigerant in the cold storage tank (210) to the first evaporator (270). At the same time, the compressor (230) is turned on, and the four-way valve (240) switches the internal flow direction. The high-temperature and high-pressure refrigerant enters the first evaporator (270) through the four-way valve (240) to exchange heat with the refrigerant and heat the circulating refrigerant. After the refrigerant dissipates heat, it is throttled by the electronic expansion valve (260). The throttled refrigerant enters the condenser (250) to absorb heat. The refrigerant that has absorbed heat returns to the compressor (230) to complete the heating cycle. At the same time, the target liquid supply flow rate Q is set according to the parameter input module (110). After calculation by the PID controller (100), the frequency of the external circulation pump (310) is output to ensure the liquid supply. The flow rate is calculated by the PID controller (100) based on the target supply liquid temperature T1 set by the parameter input module (110) and the return liquid temperature T2 collected by the return liquid temperature sensor (340a). The frequency of the internal circulation pump (220) is output. At this time, the heat-carrying refrigerant that has exchanged with the high-temperature refrigerant in the first evaporator (270) enters the second evaporator (280) to exchange with the exchange liquid. After the exchange liquid exchanges with the refrigerant, it carries heat and is continuously transported by the external circulation pump (310) through the flow meter (320) and the supply liquid pipe (330) to heat the target. Then, it re-enters the second evaporator (280) through the return liquid pipe (340) to continue to exchange heat with the refrigerant. The refrigerant that has exchanged with the exchange liquid flows back to the cold storage bag (210).

Images