Linear temperature rise and fall system and control method thereof

Abstract

The present invention relates to the technical field of temperature control, and discloses a linear temperature rise and fall system and a control method thereof. The linear temperature rise and fall system comprises a refrigerant device, a first refrigeration device and a second refrigeration device. The refrigerant device comprises an expansion tank, a cold storage tank, a heating tank, a first heat exchange component and a second heat exchange component. The expansion tank is used to provide a refrigerant for the cold storage tank and the heating tank and to cause thermal expansion of the refrigerant when the temperature rises. The cold storage tank is connected to the first heat exchange component, and the heating tank is connected to the client load through the second heat exchange component; the outlet of the cold storage tank is connected to the inlet of the heating tank through a first regulating pipeline, and the first regulating pipeline can regulate the refrigerant flow from the cold storage tank to the heating tank; the outlet of the heating tank is connected to the inlet of the cold storage tank through a second regulating pipeline, and the second regulating pipeline can regulate the refrigerant flow from the heating tank to the cold storage tank. The first refrigeration device is connected to the first heat exchange component, and the second refrigeration device is connected to the second heat exchange component.

Description

Technical Field

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

[0002] The current temperature rise and fall systems on the market have two cooling modes in the rapid temperature change test using liquids. One is as follows: Figure 1 The nonlinear cooling shown in the figure is uneven from high temperature to low temperature. The cooling speed is fast at the beginning, and the closer to the set low temperature point, the slower the cooling speed. This trend is in line with the refrigeration principle of the refrigeration system and is easy to achieve. Figure 2 The linear cooling shown in the figure means that the cooling rate in each period is uniform when the temperature drops from high temperature to low temperature. This requires a certain control method to meet the requirements of the linear slope.

[0003] The liquid cooling systems that can achieve linear cooling in the prior art generally have a small temperature range. For example, below a certain temperature, they cannot meet the linear slope requirements of higher demands. For example, liquid cooling equipment at -40°C generally cannot meet the linear slope requirements below -10°C. This is because the cooling capacity of the refrigeration system will decrease at low temperatures. When a certain low temperature is reached, the performance of the refrigeration system decreases, the temperature no longer decreases, and the cooling rate drops to the minimum. The liquid cooling technology commonly used in the market is linear cooling in the medium and high temperature range (such as above 0°C), and the slope can be relatively high (such as 6°C / min to 10°C / min). If linear cooling is required in the entire temperature range, the configuration of the liquid cooling refrigeration system will generally be greatly increased, and large compressors, heat exchangers and other hardware configurations will be used, which increases the cost; and the cooling effect is not ideal at low temperatures. Summary of the invention

[0004] The object of the present invention is to provide a linear temperature rise and fall system and a control method thereof, so as to achieve linear temperature reduction in the full temperature range and ensure the temperature reduction effect in the low temperature range.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Linear temperature rise and fall system, comprising:

[0007] A refrigerant device, comprising an expansion tank, a cold storage tank, a heating tank, a first heat exchange component and a second heat exchange component, wherein the expansion tank is used to provide a refrigerant for the cold storage tank and the heating tank and to cause thermal expansion of the refrigerant when the temperature of the refrigerant rises, the cold storage tank is connected to the first heat exchange component to form a cold storage circuit, and the heating tank is connected to the client load through the second heat exchange component to form a temperature rise and fall circuit, which is used to rise and fall the temperature of the client load; the outlet of the cold storage tank is connected to the inlet of the heating tank through a first regulating pipeline, and the first regulating pipeline can regulate the flow of the refrigerant entering the heating tank from the cold storage tank; the outlet of the heating tank is connected to the inlet of the cold storage tank through a second regulating pipeline, and the second regulating pipeline can regulate the flow of the refrigerant entering the cold storage tank from the heating tank;

[0008] A first refrigeration device and a second refrigeration device, wherein the first refrigeration device is connected to the first heat exchange component and is used to reduce the temperature of the cold storage tank; and the second refrigeration device is connected to the second heat exchange component and is used to reduce the temperature of the heating tank.

[0009] As an optional solution of the linear temperature rise and fall system, a first regulating valve is provided on the first regulating pipeline, and the first regulating valve is used to regulate the flow rate of the coolant entering the heating tank from the cold storage tank;

[0010] The second regulating pipeline is provided with a second regulating valve, and the second regulating valve is used to regulate the flow rate of the coolant entering the cold storage tank from the heating tank.

[0011] As an optional solution of the linear temperature rise and fall system, the first heat exchange component includes an internal circulation pump and a first evaporator, the outlet of the cold storage tank is connected to the inlet of the first evaporator through the internal circulation pump, and the outlet of the first evaporator is connected to the inlet of the cold storage tank;

[0012] The second heat exchange component includes an external circulation pump and a second evaporator, the outlet of the heating tank is connected to the inlet of the client load through the external circulation pump, the outlet of the client load is connected to the inlet of the second evaporator, and the outlet of the second evaporator is connected to the inlet of the heating tank.

[0013] As an optional solution of the linear temperature rise and fall system, one end of the first regulating pipeline is connected to the outlet of the first evaporator, and the other end is connected to the inlet of the heating tank;

[0014] One end of the second regulating pipeline is connected to the outlet of the heating tank, and the other end is connected to the inlet of the internal circulation pump.

[0015] As an optional solution of the linear temperature rise and fall system, the first refrigeration device includes a first compressor, a first condenser and a first expansion valve, the first evaporator is connected to the first compressor, the first compressor is connected to the first condenser, and the first condenser is connected to the first evaporator through the first expansion valve;

[0016] The second refrigeration device comprises a second compressor, a second condenser and a second expansion valve, the second evaporator is connected to the second compressor, the second compressor is connected to the second condenser, and the second condenser is connected to the second evaporator through the second expansion valve;

[0017] The liquid inlet of the first condenser and the liquid inlet of the second condenser are both connected to the coolant inlet pipe, and the liquid outlet of the first condenser and the liquid outlet of the second condenser are both connected to the coolant outlet pipe.

[0018] As an optional solution of the linear temperature rise and fall system, the volume of the cold storage tank is ≥ the volume of the heating tank × 3.

[0019] As an optional solution of the linear heating and cooling system, the exhaust port of the cold storage tank is connected to the air inlet of the expansion tank through a first exhaust pipeline, and the exhaust port of the heating tank is connected to the air inlet of the expansion tank through a second exhaust pipeline.

[0020] As an optional solution of the linear temperature rise and fall system, a first exhaust temperature sensor is provided on the first exhaust pipe, and a second exhaust temperature sensor is provided on the second exhaust pipe.

[0021] A control method for a linear temperature rise and fall system is applied to the linear temperature rise and fall system as described in any of the above schemes, and the control method for the linear temperature rise and fall system comprises the following steps:

[0022] Controlling the linear temperature rise and fall system to enter a cold storage mode, in which the first refrigeration device works, the first regulating pipeline and the second regulating pipeline are both disconnected, and when the temperature of the cold storage tank reaches a first set temperature, the cold storage mode ends, and the cold storage tank is controlled to be maintained below the first set temperature;

[0023] The linear temperature rise and fall system is controlled to enter a cooling mode. In the cooling mode, the second refrigeration device works, and when the liquid supply temperature in the temperature rise and fall circuit is lower than the second set temperature, the first regulating pipeline and the second regulating pipeline are controlled to be opened, and the refrigerant flow rate from the cold storage tank to the heating tank and the refrigerant flow rate from the heating tank to the cold storage tank are adjusted, and the heating power of the heating tank is adjusted so that the client load is cooled at a fixed slope, and the second set temperature is higher than the first set temperature.

[0024] As an optional solution of the control method of the linear temperature rise and fall system, a first regulating valve is provided on the first regulating pipeline, and a second regulating valve is provided on the second regulating pipeline. The steps of controlling the first regulating pipeline and the second regulating pipeline to open and regulating the brine flow rate of the cold storage tank entering the heating tank and the brine flow rate of the heating tank entering the cold storage tank include:

[0025] Open the first regulating valve and the second regulating valve, and adjust the flow rate of the coolant from the cold storage tank to the heating tank and the flow rate of the coolant from the heating tank to the cold storage tank by adjusting the opening degree of the first regulating valve and the second regulating valve.

[0026] As an optional solution of the control method of the linear temperature rise and fall system, a first exhaust temperature sensor is provided on a first exhaust pipe connected to the exhaust port of the cold storage tank, and a second exhaust temperature sensor is provided on a second exhaust pipe connected to the exhaust port of the heating tank. The method for adjusting the opening of the first regulating valve and the second regulating valve includes the following steps:

[0027] while opening the first regulating valve and the second regulating valve, detecting the temperature in the first exhaust pipe by the first exhaust temperature sensor, detecting the temperature in the second exhaust pipe by the second exhaust temperature sensor, and calculating a real-time temperature difference between the second exhaust pipe and the first exhaust pipe;

[0028] According to the difference between the real-time target temperature and the real-time temperature of the supply liquid in the heating and cooling circuit, the opening of the first regulating valve is adjusted, and the opening of the second regulating valve is adjusted simultaneously with the opening of the first regulating valve;

[0029] The opening of the second regulating valve is adjusted according to whether the calculated real-time temperature difference between the second exhaust pipeline and the first exhaust pipeline is within a set temperature difference range.

[0030] As an optional solution of the control method of the linear temperature rise and fall system, according to whether the calculated real-time temperature difference between the second exhaust pipeline and the first exhaust pipeline is within the set temperature difference range, the method of adjusting the opening of the second regulating valve is:

[0031] When the real-time temperature difference between the second exhaust pipeline and the first exhaust pipeline is within the set temperature difference range, the second regulating valve and the first regulating valve maintain the same opening degree;

[0032] When the real-time temperature difference between the second exhaust pipeline and the first exhaust pipeline exceeds the set temperature difference range, the opening of the first regulating valve remains unchanged, and the opening of the second regulating valve is adjusted according to the real-time temperature difference between the second exhaust pipeline and the first exhaust pipeline.

[0033] As an optional solution of the control method of the linear temperature rise and fall system, the set temperature difference range includes a maximum limit temperature difference and a minimum limit temperature difference. According to the real-time temperature difference between the second exhaust pipeline and the first exhaust pipeline, the specific steps of adjusting the opening of the second regulating valve include:

[0034] When the real-time temperature difference between the second exhaust pipeline and the first exhaust pipeline is greater than the maximum limit temperature difference, reducing the opening of the second regulating valve;

[0035] When the real-time temperature difference between the second exhaust pipeline and the first exhaust pipeline is less than the minimum limit temperature difference, the opening of the second regulating valve is increased.

[0036] Beneficial effects of the present invention:

[0037] The linear temperature rise and fall system provided by the present invention is provided with a cold storage tank and a heating tank in a coolant device, an expansion tank provides coolant for the cold storage tank and the heating tank and is used for the thermal expansion of the coolant, the cold storage tank is connected to the first heat exchange component to form a cold storage circuit, and the first refrigeration device is connected to the first heat exchange component to store cold for the cold storage tank. The heating tank is connected to the client load through the second heat exchange component to form a temperature rise and fall circuit to heat and fall the client load. During operation, the first refrigeration device is first turned on to store cold for the cold storage tank through the cold storage circuit, and the second refrigeration device is turned on after the cold storage is completed to cool the client load through the temperature rise and fall circuit. When the temperature falls into the low temperature section, the flow rate of the coolant with a lower temperature entering the heating tank from the cold storage tank is adjusted through the first regulating pipeline, and the flow rate of the coolant with a higher temperature entering the cold storage tank from the heating tank is adjusted through the second regulating pipeline, so that the refrigerant with a lower temperature enters the temperature rise and fall circuit smoothly, the cooling rate of the liquid supply in the temperature rise and fall circuit is increased, and the linear cooling process within the full temperature range is completed. The linear temperature rise and fall system realizes linear temperature reduction in the full temperature range without increasing the configuration of the refrigeration device, and ensures the cooling effect in the low temperature range.

[0038] The control method of the linear heating and cooling system provided by the present invention pre-stores cold in a cold storage tank through a first refrigeration device so that the temperature of the cold storage tank reaches a first set temperature, and then refrigerates the liquid in the heating and cooling circuit through a second refrigeration device to cool the client load. When the liquid supply temperature in the heating and cooling circuit reaches a second set temperature, the flow rate of the coolant entering the heating tank from the cold storage tank is adjusted through the first regulating pipeline and the second regulating pipeline, so that the coolant with a lower temperature in the cold storage tank is mixed with the coolant with a higher temperature in the heating tank, thereby increasing the cooling rate in the low temperature section, and using a limited configuration of refrigeration devices to achieve linear cooling in the entire temperature section, thereby meeting the cooling requirements of the client load. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the temperature-time relationship of the nonlinear cooling of the heating and cooling system in the prior art.

[0040] Figure 2 It is a schematic diagram of the relationship between temperature and time of linear cooling of the cooling and heating system in the prior art.

[0041] Figure 3 It is a schematic diagram of the principle of the linear temperature rise and fall system provided by an embodiment of the present invention.

[0042] Figure 4 It is a flow chart of a control method of a linear temperature rise and fall system provided by an embodiment of the present invention.

[0043] Figure 5 It is a flow chart of a method for adjusting the opening of a first regulating valve and a second regulating valve provided in an embodiment of the present invention.

[0044] In the figure:

[0045] 100. Client load;

[0046] 1. Coolant device; 11. Expansion tank; 111. First liquid outlet pipeline; 1111. First non-return valve; 112. Second liquid outlet pipeline; 1121. Second non-return valve; 12. Cold storage tank; 121. First exhaust pipeline; 1211. First exhaust temperature sensor; 13. First heat exchange component; 131. Internal circulation pump; 132. First evaporator; 14. Heating tank; 141. Second exhaust pipeline; 1411. Second exhaust temperature sensor; 15. Second heat exchange component; 151. External circulation pump; 152. Second evaporator; 16. Cold storage circuit; 17. Heating and cooling circuit; 171. Liquid supply temperature sensor; 172. Liquid return temperature sensor; 173. Liquid supply pressure sensor; 174. Liquid return pressure sensor; 18. First regulating pipeline; 181. First regulating valve; 19. Second regulating pipeline; 191. Second regulating valve;

[0047] 2. First refrigeration device; 21. First compressor; 22. First condenser; 23. First expansion valve; 24. First front-end pressure sensor; 25. First rear-end pressure sensor; 26. First oil separator; 27. First drying filter;

[0048] 3. Second refrigeration device; 31. Second compressor; 32. Second condenser; 33. Second expansion valve; 34. Second front-end pressure sensor; 35. Second rear-end pressure sensor; 36. Second oil separator; 37. Second drying filter;

[0049] 4. Coolant inlet pipe;

[0050] 5. Coolant outlet pipe; 51. Flow switch. DETAILED DESCRIPTION

[0051] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0052] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0053] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0055] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0056] Embodiment 1:

[0057] like Figure 3 As shown, the linear temperature rise and fall system provided in this embodiment includes a refrigerant device 1, a first refrigeration device 2 and a second refrigeration device 3. When working, the first refrigeration device 2 is first turned on, and the refrigerant device 1 is cooled by the first refrigeration device 2. After the cold storage is completed; the second refrigeration device 3 is turned on, and the client load 100 is cooled and lowered by the second refrigeration device 3 and the refrigerant device 1. A relatively small power refrigeration device is used to complete the linear cooling process in the full temperature range, and a relatively high slope linear cooling can be achieved, thereby ensuring the cooling effect in the low temperature range.

[0058] The refrigerant device 1 includes an expansion tank 11, a cold storage tank 12, a heating tank 14, a first heat exchange component 13, and a second heat exchange component 15. The expansion tank 11 is used to provide a refrigerant for the cold storage tank 12 and the heating tank 14 and is used for thermal expansion when the refrigerant is heated. The cold storage tank 12 is connected to the first heat exchange component 13 to form a cold storage circuit 16. The heating tank 14 is connected to the client load 100 through the second heat exchange component 15 to form a heating and cooling circuit 17, which is used to heat and cool the client load 100. The first refrigeration device 2 is connected to the first heat exchange component 13, and is used to reduce the temperature of the cold storage tank 12 to achieve cold storage of the cold storage tank 12. The second refrigeration device 3 is connected to the second heat exchange component 15, and is used to reduce the temperature of the client load 100.

[0059] The top of the expansion tank 11 is provided with a liquid filling port, and a liquid level gauge is provided in the expansion tank 11. The coolant is a liquid, which is added into the expansion tank 11 through the liquid filling port. The bottom of the expansion tank 11 is provided with two liquid outlets, one of which is connected to the inlet of the cold storage tank 12 through a first liquid outlet pipeline 111, and the other is connected to the inlet of the heating tank 14 through a second liquid outlet pipeline 112. A first check valve 1111 is provided on the first liquid outlet pipeline 111. The first check valve 1111 is used for one-way communication from the expansion tank 11 to the cold storage tank 12, so that the liquid in the cold storage tank 12 cannot flow back to the expansion tank 11, and the liquid volume in the cold storage circuit 16 is balanced. A second check valve 1121 is provided on the second liquid outlet pipeline 112. The second check valve 1121 is used for one-way communication from the expansion tank 11 to the heating tank 14, so that the liquid in the heating tank 14 cannot flow back to the expansion tank 11, and the liquid volume in the heating and cooling circuit 17 is balanced.

[0060] A heating pipe is provided in the heating tank 14. The liquid entering the heating tank 14 reaches the client load 100 after being heated by the heating pipe. After flowing through the client load 100, it is cooled and exchanged with heat through the second heat exchange component 15 and the second refrigeration device 3, and then returns to the heating tank 14 to be heated by the heating pipe. Balance is reached in the heating tank 14, and then the required temperature is reached; then the liquid is transported to the client load 100 to absorb the heat continuously generated in the client load 100 or to provide heat for the client load 100 to meet the temperature requirement of the client load 100.

[0061] In one embodiment, the first heat exchange assembly 13 includes an internal circulation pump 131 and a first evaporator 132. The outlet of the cold storage tank 12 is connected to the inlet of the first evaporator 132 through the internal circulation pump 131, and the outlet of the first evaporator 132 is connected to the inlet of the cold storage tank 12. The coolant entering the cold storage tank 12 enters the first evaporator 132 under the action of the internal circulation pump 131, and the coolant in the first evaporator 132 exchanges heat with the refrigerant in the first refrigeration device 2, and the first refrigeration device 2 provides cooling capacity, and then returns to the cold storage tank 12 to store cold capacity.

[0062] The second heat exchange assembly 15 includes an external circulation pump 151 and a second evaporator 152. The outlet of the heating tank 14 is connected to the inlet of the client load 100 through the external circulation pump 151, and the outlet of the client load 100 is connected to the inlet of the second evaporator 152. The outlet of the second evaporator 152 is connected to the inlet of the heating tank 14. The brine entering the heating tank 14 is heated by the heating pipe, and then reaches the client load 100 under the transportation of the external circulation pump 151. After flowing out of the client load 100, it enters the second evaporator 152. The brine in the second evaporator 152 exchanges heat with the refrigerant in the second refrigeration device 3, and the second refrigeration device 3 provides cooling capacity. Then, the brine returns to the heating tank 14 and is heated by the heating pipe. It reaches equilibrium in the heating tank 14 and reaches the required temperature. Then, it is transported to the client load 100 through the external circulation pump 151 to absorb the heat generated by the client load 100 or provide heat for the client load 100 to meet the heating and cooling requirements of the client load 100.

[0063] The heating and cooling loop 17 is also provided with a liquid supply temperature sensor 171, a liquid return temperature sensor 172, a liquid supply pressure sensor 173 and a liquid return pressure sensor 174. The liquid supply pressure sensor 173 and the liquid supply temperature sensor 171 are arranged between the external circulation pump 151 and the client load 100. The liquid supply pressure sensor 173 is used to detect the pressure of the brine entering the client load 100, and the liquid supply temperature sensor 171 is used to detect the temperature of the brine provided to the client load 100 for exchanging heat with the client load 100. The liquid return pressure sensor 174 and the liquid return temperature sensor 172 are arranged between the client load 100 and the first evaporator 132. The liquid return pressure sensor 174 is used to detect the pressure of the brine flowing out of the client load 100, and the liquid return temperature sensor 172 is used to detect the temperature of the brine flowing out of the client load 100.

[0064] The first refrigeration device 2 includes a first compressor 21, a first condenser 22 and a first expansion valve 23. The first evaporator 132 is connected to the first compressor 21, the first compressor 21 is connected to the first condenser 22, and the first condenser 22 is connected to the first evaporator 132 through the first expansion valve 23. The second refrigeration device 3 includes a second compressor 31, a second condenser 32 and a second expansion valve 33. The second evaporator 152 is connected to the second compressor 31, the second compressor 31 is connected to the second condenser 32, and the second condenser 32 is connected to the second evaporator 152 through the second expansion valve 33. The liquid inlet of the first condenser 22 and the liquid inlet of the second condenser 32 are both connected to the coolant inlet pipe 4, and the liquid outlet of the first condenser 22 and the liquid outlet of the second condenser 32 are both connected to the coolant outlet pipe 5. A flow switch 51 is provided on the coolant outlet pipe 5. The flow switch 51 detects whether coolant flows out of the coolant outlet pipe 5 to protect the linear temperature rise and fall system. If the flow switch 51 detects that no coolant flows out of the coolant outlet pipe 5, the flow switch 51 will send an alarm signal. The first refrigeration device 2 and the second refrigeration device 3 have the same structure and working principle, and both are liquid-cooled refrigeration devices. The various components in the first refrigeration device 2 and the second refrigeration device 3 are connected by pipelines to form a closed system. The coolant provided by the coolant inlet pipe 4 circulates in the closed system and constantly changes its state.

[0065] The refrigeration principle of the first refrigeration device 2 is as follows: the refrigerant in the first refrigeration device 2 exchanges heat with the coolant in the first evaporator 132 to achieve the purpose of refrigerating the cold storage tank 12. The low-pressure refrigerant vapor generated in the first evaporator 132 is first sucked in by the first compressor 21 and adiabatically compressed to the condensation pressure, and then enters the first condenser 22, and is cooled by the coolant in the first condenser 22 and condensed into a high-pressure liquid. The high-pressure liquid then adiabatically expands through the first expansion valve 23, and the pressure is reduced to the evaporation pressure, and the temperature is reduced to the evaporation temperature, becoming a gas-liquid mixture; then enters the first evaporator 132, absorbs the heat of the coolant in the first evaporator 132 at a low temperature and evaporates into vapor, and is sucked into the first compressor 21 again, and the cycle starts again. The entire refrigeration process reduces the temperature of the coolant in the first evaporator 132.

[0066] Since the refrigeration principle of the second refrigeration device 3 is the same as that of the first refrigeration device 2 , it will not be described in detail here. The second refrigeration device 3 reduces the temperature of the coolant in the second evaporator 152 during the refrigeration process.

[0067] Furthermore, the first refrigeration device 2 further includes a first front-end pressure sensor 24, a first rear-end pressure sensor 25, a first oil separator 26 and a first drying filter 27. The first front-end pressure sensor 24 is arranged at one end of the first compressor 21 close to the first evaporator 132, and the first rear-end pressure sensor 25 is arranged at one end of the first compressor 21 away from the first evaporator 132. The front-end pressure sensor 24 and the first rear-end pressure sensor 25 are used to detect the front-back pressure difference of the first compressor 21 to ensure the compression performance of the first compressor 21. The outlet of the first compressor 21 is connected to the top inlet of the first oil separator 26 so that the refrigerant vapor compressed to the condensation pressure enters the first oil separator 26 to separate the oil liquid, and the bottom outlet of the first oil separator 26 is connected to the inlet of the first compressor 21 so that the oil liquid separated by the first oil separator 26 flows back to the first compressor 21. The top outlet of the first oil separator 26 is connected to the inlet of the first condenser 22. The refrigerant vapor from which the oil is separated flows out from the top outlet of the first oil separator 26, enters the first condenser 22, is cooled by the coolant in the first condenser 22, and condenses into a high-pressure liquid. The first drying filter 27 is connected between the first condenser 22 and the first expansion valve 23. The high-pressure liquid is dried and filtered by the first drying filter 27 before entering the first expansion valve 23. The first drying filter 27 is used to protect the first evaporator 132 from being contaminated by moisture and solid pollutants entering the system.

[0068] The second refrigeration device 3 further includes a second front-end pressure sensor 34, a second rear-end pressure sensor 35, a second oil separator 36 and a second drying filter 37. The second front-end pressure sensor 34 is arranged at one end of the second compressor 31 close to the second evaporator 152, and the second rear-end pressure sensor 35 is arranged at one end of the second compressor 31 away from the second evaporator 152. The front-end pressure sensor 34 and the second rear-end pressure sensor 35 are used to detect the front-end pressure difference of the second compressor 31 to ensure the compression performance of the second compressor 31. The outlet of the second compressor 31 is connected to the top inlet of the second oil separator 36 so that the refrigerant vapor compressed to the condensing pressure enters the second oil separator 36 to separate the oil liquid, and the bottom outlet of the second oil separator 36 is connected to the inlet of the second compressor 31 so that the oil liquid separated by the second oil separator 36 flows back to the second compressor 31. The top outlet of the second oil separator 36 is connected to the inlet of the second condenser 32. The refrigerant vapor from which the oil is separated flows out from the top outlet of the second oil separator 36, enters the second condenser 32, is cooled by the coolant in the second condenser 32, and condenses into a high-pressure liquid. The second drying filter 37 is connected between the second condenser 32 and the second expansion valve 33. The high-pressure liquid is dried and filtered by the second drying filter 37 before entering the second expansion valve 33. The second drying filter 37 is used to protect the second evaporator 152 from being contaminated by moisture and solid contaminants entering the system.

[0069] The outlet of the cold storage tank 12 is connected to the inlet of the heating tank 14 through the first regulating pipeline 18, and the first regulating pipeline 18 can regulate the flow of the refrigerant entering the heating tank 14 from the cold storage tank 12; the outlet of the heating tank 14 is connected to the inlet of the cold storage tank 12 through the second regulating pipeline 19, and the second regulating pipeline 19 can regulate the flow of the refrigerant entering the cold storage tank 12 from the heating tank 14. During operation, the first refrigeration device 2 is first turned on to store cold for the cold storage tank 12 through the cold storage circuit 16, and after the cold storage is completed, the second refrigeration device 3 is turned on to cool the client load 100 through the temperature rise and fall circuit 17. When the temperature falls into the low temperature section, the flow of the refrigerant with a lower temperature from the cold storage tank 12 to the heating tank 14 is adjusted through the first regulating pipeline 18, and the flow of the refrigerant with a higher temperature from the heating tank 14 to the cold storage tank 12 is adjusted through the second regulating pipeline 19, so that the refrigerant with a lower temperature smoothly enters the temperature rise and fall circuit 17, completing the process of linear cooling in the full temperature range.

[0070] In one embodiment, one end of the first regulating pipeline 18 is connected to the outlet of the first evaporator 132, and the other end is connected to the inlet of the heating tank 14. Connecting the first regulating pipeline 18 to the outlet of the first evaporator 132 reduces the temperature of the liquid entering the heating tank 14, and can cool down the client load 100 faster.

[0071] One end of the second regulating pipeline 19 is connected to the outlet of the heating tank 14, and the other end is connected to the inlet of the internal circulation pump 131. The temperature of the liquid flowing out of the heating tank 14 is higher than that of the liquid in the cold storage tank 12, and it is not suitable to directly enter the cold storage tank 12. After being transported to the first evaporator 132 for heat exchange and cooling by the internal circulation pump 131, it enters the cold storage tank 12 again, which effectively slows down the temperature rise in the cold storage tank 12.

[0072] In one embodiment, a first regulating valve 181 is provided on the first regulating pipeline 18, and the first regulating valve 181 is used to regulate the flow rate of the refrigerant entering the heating tank 14 from the cold storage tank 12; a second regulating valve 191 is provided on the second regulating pipeline 19, and the second regulating valve 191 is used to regulate the flow rate of the refrigerant entering the cold storage tank 12 from the heating tank 14. When the second refrigeration device 3 starts to work and cools the client load 100, when the temperature of the liquid in the temperature rise and fall circuit 17 drops to the low temperature section, the cooling capacity provided by the second refrigeration device 3 alone cannot meet the cooling rate of the linear cooling, and the drop rate of the supply temperature in the temperature rise and fall circuit 17 becomes slower and slower. At this time, the first regulating valve 181 and the second regulating valve 191 are opened, and the opening of the first regulating valve 181 and the second regulating valve 191 are controlled to mix the refrigerant in the cold storage tank 12 with the refrigerant in the heating tank 14, accelerate the cooling rate of the liquid in the heating tank 14, use the cooling capacity in the cold storage tank 12 to cool the supply liquid in the temperature rise and fall circuit 17, and adjust the heating power of the heating tube in the heating tank 14 so that the linear temperature rise and fall system cools at a fixed slope.

[0073] In one embodiment, the volume of the cold storage tank 12 is ≥ the volume of the heating tank 14 × 3. If the volume of the cold storage tank 12 does not meet the above requirements, after the first regulating valve 181 and the second regulating valve 191 are opened in the low temperature section, the temperature in the cold storage tank 12 will rise rapidly and cannot be controlled below the minimum target temperature required by the client load 100, resulting in a decrease in the cooling rate at the minimum target temperature, and linear cooling cannot be met. It should be noted that the larger the volume of the cold storage tank 12, the greater the refrigeration capacity stored therein, and the greater the slope of the linear cooling that can be achieved, that is, the greater the cooling rate.

[0074] The linear temperature rise and fall system provided in this embodiment can achieve a high temperature reduction rate of more than 6°C / min in the whole temperature range, thereby meeting the linear temperature reduction demand of the client load 100.

[0075] In one embodiment, the exhaust port of the cold storage tank 12 is connected to the air inlet of the expansion tank 11 through the first exhaust pipeline 121, and the exhaust port of the heating tank 14 is connected to the air inlet of the expansion tank 11 through the second exhaust pipeline 141. When there is gas in the cold storage tank 12, it enters the expansion tank 11 through the exhaust port at the top of the cold storage tank 12 and the first exhaust pipeline 121, and does not affect the liquid pressure in the cold storage circuit 16. When there is gas in the heating tank 14, it enters the expansion tank 11 through the exhaust port at the top of the heating tank 14 and the second exhaust pipeline 141, and does not affect the liquid pressure in the heating and cooling circuit 17.

[0076] In order to prevent the liquid inflow and outflow flow in the cold storage tank 12 and the heating tank 14 from being unbalanced when adjusting the opening of the first regulating valve 181 and the second regulating valve 191, causing the coolant in the cold storage tank 12 to enter the expansion tank 11 through the exhaust port of the cold storage tank 12 through the first exhaust pipeline 121, or the coolant in the heating tank 14 to enter the expansion tank 11 through the exhaust port of the heating tank 14 through the second exhaust pipeline 141, causing the coolant flow circulating in the heating and cooling loop 17 to change and affect the cooling effect. A first exhaust temperature sensor 1211 is provided on the first exhaust pipeline 121, and a second exhaust temperature sensor 1411 is provided on the second exhaust pipeline 141. Once the coolant in the cold storage tank 12 enters the first exhaust pipe 121 through the exhaust port of the cold storage tank 12, it will affect the temperature in the first exhaust pipe 121, causing the temperature detected by the first exhaust temperature sensor 1211 to decrease; similarly, if the coolant in the heating tank 14 enters the second exhaust pipe 141 through the exhaust port of the heating tank 14, it will affect the temperature in the second exhaust pipe 141, causing the temperature detected by the second exhaust temperature sensor 1411 to decrease. According to whether the temperatures detected by the first exhaust temperature sensor 1211 and the second exhaust temperature sensor 1411 decrease, the openings of the first regulating valve 181 and the second regulating valve 191 are further adjusted to prevent the coolant in the cold storage tank 12 and the heating tank 14 from pushing into the expansion tank 11, causing the liquid flow circulating in the heating and cooling circuit 17 to change and affect the cooling effect.

[0077] The linear temperature rise and fall system provided in this embodiment further includes a control device, which is used to control the operation of the coolant device 1 , the first refrigeration device 2 , and the second refrigeration device 3 .

[0078] The linear heating and cooling system provided in this embodiment is a system integrating linear heating and linear cooling, which can realize linear heating and linear cooling requirements within the set temperature range. When heating the client load 100, the first regulating valve 181 and the second regulating valve 191 are both closed, and the heating tank 14 and the second refrigeration device 3 are controlled to work. By increasing the heating power of the heating pipe in the heating tank 14 and reducing the cooling capacity output by the second refrigeration device 3, linear heating is achieved.

[0079] The linear temperature rise and fall system provided in this embodiment can realize linear temperature rise and linear temperature drop in the whole temperature range, can strictly control the rise and fall rate per minute, provide heat source and cold source for reaction kettles, tanks, etc., and can also be used for heating and cooling of other equipment, or testing the heat resistance, cold resistance, and dryness resistance of various materials. Moreover, it is applicable to a wide range of industries, such as electronics, electrical appliances, communications, instruments, vehicles, plastic products, metals, food, chemicals, building materials, medical treatment, aerospace, etc.

[0080] Embodiment 2:

[0081] like Figure 4 As shown, this embodiment provides a control method for a linear temperature rise and fall system, which is applied to the linear temperature rise and fall system provided in the above embodiment 1. The control method for the linear temperature rise and fall system includes the following steps:

[0082] S10, control the linear temperature rise and fall system to enter the cold storage mode. In the cold storage mode, the first refrigeration device 2 works, the first regulating pipeline 18 and the second regulating pipeline 19 are both disconnected, and when the temperature of the cold storage tank 12 reaches the first set temperature, the cold storage mode ends, and the cold storage tank 12 is controlled to maintain below the first set temperature.

[0083] Before the linear temperature rise and fall system is started, the coolant is first added through the liquid filling port on the top of the expansion tank 11. After the linear temperature rise and fall system is started, the first one-way valve 1111 and the second one-way valve 1121 are opened, and the coolant in the expansion tank 11 enters the cold storage tank 12 through the first liquid outlet pipeline 111, and enters the heating tank 14 through the second liquid outlet pipeline 112. Then the control device first controls the linear temperature rise and fall system to enter the cold storage mode, turns on the internal circulation pump 131 and the first refrigeration device 2, and the first regulating valve 181 and the second regulating valve 191 remain in the closed state. When the temperature in the cold storage tank 12 reaches the first set temperature, the cold storage mode ends. At this time, the first compressor 21 continues to operate. Because the first compressor 21 has reached the compression limit at this time, the evaporation temperature of the first evaporator 132 remains unchanged, and the temperature in the cold storage tank 12 is maintained below the first set temperature.

[0084] S20, control the linear temperature rise and fall system to enter the cooling mode. In the cooling mode, the second refrigeration device 3 works, and when the liquid supply temperature in the temperature rise and fall circuit 17 is lower than the second set temperature, the first regulating pipeline 18 and the second regulating pipeline 19 are controlled to be opened, and the refrigerant flow rate from the cold storage tank 12 to the heating tank 14 and the refrigerant flow rate from the heating tank 14 to the cold storage tank 12 are adjusted, so that the client load 100 is cooled at a fixed slope, and the second set temperature is higher than the first set temperature.

[0085] In the cooling mode, the second refrigeration device 3 is controlled to work, and the liquid in the heating and cooling loop 17 is cooled by the second evaporator 152. When the liquid supply temperature in the heating and cooling loop 17 is lower than the second set temperature, the second set temperature is the temperature of the low temperature section within the set temperature range of the cooling, and the second set temperature is higher than the first set temperature. In general, the first set temperature is lower than the minimum target temperature required by the client load 100 to ensure the cooling rate when the minimum target temperature required by the client load 100 is reached. Exemplarily, the second set temperature is 0°C and the first set temperature is -42°C. When the second refrigeration device 3 provides cooling capacity for the temperature rise and fall circuit 17 and the temperature of the refrigerant in the temperature rise and fall circuit 17 drops to 0°C, the refrigeration rate of the second refrigeration device 3 gradually decreases, and the lower the supply temperature in the temperature rise and fall circuit 17, the slower the cooling rate, and it is unable to meet the linear cooling with a fixed slope. At this time, the first regulating pipeline 18 and the second regulating pipeline 19 are opened to mix the refrigerant in the cold storage tank 12 with the refrigerant in the heating tank 14 to increase the supply cooling rate in the temperature rise and fall circuit 17, and by adjusting the heating power of the heating pipe, the client load 100 is cooled with a fixed slope. That is, when the flow rate of the coolant entering the heating tank 14 from the cold storage tank 12 is large, resulting in a slightly large cooling rate of the liquid supply in the temperature rise and fall circuit 17, the heating power of the heating tube is increased by fine-tuning the heating power of the heating tube to achieve a cooling rate with a fixed slope; when the flow rate of the coolant entering the heating tank 14 from the cold storage tank 12 is small, resulting in a slightly small cooling rate of the liquid supply in the temperature rise and fall circuit 17, the heating power of the heating tube is reduced by fine-tuning the heating power of the heating tube to achieve a cooling rate with a fixed slope.

[0086] Specifically, the steps of controlling the opening of the first regulating pipeline 18 and the second regulating pipeline 19 to adjust the flow rate of the refrigerant from the cold storage tank 12 into the heating tank 14 and the flow rate of the refrigerant from the heating tank 14 into the cold storage tank 12 include: opening the first regulating valve 181 and the second regulating valve 191, and adjusting the opening of the first regulating valve 181 and the second regulating valve 191 to adjust the flow rate of the refrigerant from the cold storage tank 12 into the heating tank 14 and the flow rate of the refrigerant from the heating tank 14 into the cold storage tank 12.

[0087] Of course, in other embodiments, a first flow meter and a second flow meter may be respectively provided on the first regulating pipeline 18 and the second regulating pipeline 19, and the flow rate of the coolant entering the heating tank 14 from the cold storage tank 12 may be detected and adjusted by the first flow meter, and the flow rate of the coolant entering the cold storage tank 12 from the heating tank 14 may be detected and adjusted by the second flow meter.

[0088] like Figure 5 As shown, the method for adjusting the opening of the first regulating valve 181 and the second regulating valve 191 includes the following steps:

[0089] S21. While opening the first regulating valve 181 and the second regulating valve 191, the temperature in the first exhaust pipe 121 is detected by the first exhaust temperature sensor 1211, the temperature in the second exhaust pipe 141 is detected by the second exhaust temperature sensor 1411, and the real-time temperature difference between the second exhaust pipe 141 and the first exhaust pipe 121 is calculated.

[0090] While the coolant in the cold storage tank 12 is mixed with the coolant in the heating tank 14 to increase the cooling rate of the liquid in the temperature rise and fall loop 17, in order to prevent the coolant in the cold storage tank 12 from entering the expansion tank 11 through the exhaust port of the cold storage tank 12 and the first exhaust pipe 121, and the coolant in the heating tank 14 from entering the expansion tank 11 through the exhaust port of the heating tank 14 and the second exhaust pipe 141, which causes the flow rate of the liquid in the temperature rise and fall loop 17 to change, thereby affecting the cooling effect. Since the first exhaust pipe 121 is connected to the cold storage tank 12, and the second exhaust pipe 141 is connected to the heating tank 14, under normal circumstances, the temperature in the first exhaust pipe 121 is lower than the temperature in the second exhaust pipe 141. Once the coolant in the cold storage tank 12 enters the first exhaust pipe 121, the temperature detected by the first exhaust temperature sensor 1211 will decrease; similarly, if the coolant in the heating tank 14 enters the second exhaust pipe 141, the temperature detected by the second exhaust temperature sensor 1411 will decrease. If the second exhaust pipe 141 is connected to the second exhaust pipe 141, the temperature in the second exhaust pipe 141 will decrease. When the temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 is within the set temperature difference range, it means that the coolant in the cold storage tank 12 and the coolant in the heating tank 14 have no tendency to enter the expansion tank 11; if the temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 exceeds the set temperature difference range, it means that the coolant in the cold storage tank 12 and the coolant in the heating tank 14 are entering the expansion tank 11, and it is necessary to adjust the flow rate of the coolant from the cold storage tank 12 entering the heating tank 14 or the flow rate of the coolant from the heating tank 14 entering the cold storage tank 12.

[0091] S22. According to the difference between the real-time target temperature and the real-time temperature of the supply liquid in the temperature rise and fall circuit 17, the opening of the first regulating valve 181 is adjusted, and the opening of the second regulating valve 191 is adjusted simultaneously with the opening of the first regulating valve 181.

[0092] The liquid supply temperature sensor 171 detects the liquid supply temperature in the heating and cooling loop 17 in real time. The real-time target temperature is the target temperature corresponding to the time point when the temperature is linearly cooled at a fixed slope. At this time, due to the decrease in the cooling rate, the real-time target temperature is greater than the real-time temperature of the liquid supply in the heating and cooling loop 17. According to the difference between the real-time target temperature and the real-time temperature of the liquid supply in the heating and cooling loop 17, the first regulating valve 181 is opened, and the mixed refrigerant in the cold storage tank 12 entering the heating tank 14 is adjusted by adjusting the opening of the first regulating valve 181. In order to ensure the balance of the refrigerant flow in the heating and cooling loop 17, the opening of the second regulating valve 191 is adjusted at the same time.

[0093] S23 , adjusting the opening of the second regulating valve 191 according to whether the calculated real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 is within a set temperature difference range.

[0094] Specifically, according to whether the calculated real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 is within the set temperature difference range, the method for adjusting the opening of the second regulating valve 191 is:

[0095] When the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 is within the set temperature difference range, it indicates that the refrigerant in the cold storage tank 12 and the refrigerant in the heating tank 14 have no tendency to enter the expansion tank 11. At this time, the second regulating valve 191 and the first regulating valve 181 maintain the same opening to ensure the balance of the refrigerant flow in the temperature rise and fall circuit 17 to avoid affecting the cooling effect.

[0096] When the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 exceeds the set temperature difference range, it means that the coolant in the cold storage tank 12 or the coolant in the heating tank 14 has entered the expansion tank 11. At this time, the opening of the first regulating valve 181 remains unchanged, and the opening of the second regulating valve 191 is adjusted according to the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121.

[0097] Specifically, the set temperature difference range includes a maximum limit temperature difference and a minimum limit temperature difference. According to the real-time temperature difference between the exhaust temperature of the heating tank 14 and the exhaust temperature of the cold storage tank 12, the specific steps of adjusting the opening of the second regulating valve 191 include:

[0098] When the real-time temperature difference between the second exhaust line 141 and the first exhaust line 121 is greater than the maximum limit temperature difference, the opening degree of the second regulating valve 191 is reduced.

[0099] When the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 is greater than the maximum limit temperature difference, it means that the temperature in the first exhaust pipeline 121 decreases, resulting in the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 being greater than the maximum limit temperature difference. At this time, more liquid enters the cold storage tank 12 from the heating tank 14, resulting in the coolant in the cold storage tank 12 being pushed into the first exhaust pipeline 121 through the exhaust port of the cold storage tank 12. The coolant entering the cold storage tank 12 from the heating tank 14 should be reduced. Therefore, the opening of the second regulating valve 191 should be reduced, and the greater the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121, the greater the reduction in the opening of the second regulating valve 191; the smaller the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121, the smaller the reduction in the opening of the second regulating valve 191.

[0100] When the real-time temperature difference between the second exhaust line 141 and the first exhaust line 121 is less than the lowest limit temperature difference, the opening of the second regulating valve 191 is increased.

[0101] When the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 is less than the minimum limit temperature difference, it means that the temperature in the second exhaust pipeline 141 decreases, resulting in the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 being less than the minimum limit temperature difference. At this time, more coolant enters the heating tank 14 from the cold storage tank 12, resulting in the coolant in the heating tank 14 being pushed into the second exhaust pipeline 141 through the exhaust port of the heating tank 14. The coolant entering the heating tank 14 from the cold storage tank 12 should be reduced. At this time, in order to ensure the cooling rate of the client load 100, the opening of the first regulating valve 181 needs to remain unchanged, and the flow rate of the refrigerant entering the cold storage tank 12 from the heating tank 14 can only be increased. Therefore, the opening of the second regulating valve 191 needs to be increased, and the smaller the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121, the greater the increase in the opening of the second regulating valve 191, and the greater the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121, the smaller the increase in the opening of the second regulating valve 191.

[0102] For example, if the temperature difference range is set to -5°C to 8°C, the maximum limit temperature difference is 8°C, and the minimum limit temperature difference is -5°C, that is, when the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 is within -5°C to 8°C, the opening of the second regulating valve 191 remains the same as the opening of the first regulating valve 181. If the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 is greater than 8°C, the opening of the second regulating valve 191 is reduced; if the real-time temperature difference between the second exhaust pipeline 141 and the first exhaust pipeline 121 is less than -5°C, the opening of the second regulating valve 191 is increased.

[0103] The control method of the linear heating and cooling system provided in the present embodiment is to pre-heat the cold storage tank 12 by the first refrigeration device 2 so that the temperature of the cold storage tank 12 reaches the first set temperature, and then refrigerate the refrigerant in the heating and cooling circuit 17 by the second refrigeration device 3 to cool the client load 100. When the supply temperature of the liquid in the heating and cooling circuit 17 reaches the second set temperature, the flow rate of the refrigerant from the cold storage tank 12 into the heating tank 14 is adjusted by the first regulating pipeline 18 and the second regulating pipeline 19, so that the lower temperature refrigerant in the cold storage tank 12 is mixed with the higher temperature refrigerant in the heating tank 14, thereby increasing the cooling rate in the low temperature section, using a limited configuration of refrigeration devices, realizing linear cooling in the entire temperature section, and meeting the cooling requirements of the client load 100.

[0104] The control method of the linear heating and cooling system is not an improvement of the present invention and can be controlled by referring to the prior art, so it will not be described in detail here.

[0105] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A control method for a linear temperature rise and fall system, characterized in that: The linear temperature rise and fall system comprises a refrigerant device (1), a first refrigeration device (2) and a second refrigeration device (3); the refrigerant device comprises a cold storage tank (12), a heating tank (14), a first heat exchange component (13) and a second heat exchange component (15); the cold storage tank (12) is connected to the first heat exchange component (13) to form a cold storage circuit (16); the heating tank (14) is connected to a client load (100) through the second heat exchange component (15) to form a temperature rise and fall circuit (17); the outlet of the cold storage tank (12) is connected to the inlet of the heating tank (14) through a first regulating pipeline (18); the outlet of the heating tank (14) is connected to the inlet of the cold storage tank (12) through a second regulating pipeline (19); the first refrigeration device (2) is used to reduce the temperature of the cold storage tank (12); and the second refrigeration device (3) is used to reduce the temperature of the heating tank (14); the control method of the linear temperature rise and fall system comprises the following steps: Controlling the linear temperature rise and fall system to enter a cold storage mode, wherein in the cold storage mode, the first refrigeration device (2) operates, the first regulating pipeline (18) and the second regulating pipeline (19) are both disconnected, and when the temperature of the cold storage tank (12) reaches a first set temperature, the cold storage mode ends, and the cold storage tank (12) is controlled to maintain a temperature below the first set temperature; The linear temperature rise and fall system is controlled to enter a cooling mode. In the cooling mode, the second refrigeration device (3) works, and when the liquid supply temperature in the temperature rise and fall circuit (17) is lower than a second set temperature, the first regulating pipeline (18) and the second regulating pipeline (19) are controlled to open, and the flow rate of the coolant from the cold storage tank (12) into the heating tank (14) and the flow rate of the coolant from the heating tank (14) into the cold storage tank (12) are adjusted, and the heating power of the heating tank (14) is adjusted so that the client load (100) is cooled at a fixed slope, and the second set temperature is higher than the first set temperature.

2. The control method of the linear temperature rise and fall system according to claim 1, characterized in that: The first regulating pipeline (18) is provided with a first regulating valve (181), and the second regulating pipeline (19) is provided with a second regulating valve (191). The steps of controlling the first regulating pipeline (18) and the second regulating pipeline (19) to open and regulating the flow rate of the brine from the cold storage tank (12) into the heating tank (14) and the flow rate of the brine from the heating tank (14) into the cold storage tank (12) include: The first regulating valve (181) and the second regulating valve (191) are opened, and the flow rate of the coolant from the cold storage tank (12) entering the heating tank (14) and the flow rate of the coolant from the heating tank (14) entering the cold storage tank (12) are adjusted by adjusting the opening degrees of the first regulating valve (181) and the second regulating valve (191).

3. The control method of the linear temperature rise and fall system according to claim 2, characterized in that: A first exhaust temperature sensor (1211) is provided on a first exhaust pipeline (121) connected to an exhaust port of the cold storage tank (12), and a second exhaust temperature sensor (1411) is provided on a second exhaust pipeline (141) connected to an exhaust port of the heating tank (14). The method for adjusting the opening of the first regulating valve (181) and the second regulating valve (191) comprises the following steps: When the first regulating valve (181) and the second regulating valve (191) are opened, the temperature in the first exhaust pipe (121) is detected by the first exhaust temperature sensor (1211), the temperature in the second exhaust pipe (141) is detected by the second exhaust temperature sensor (1411), and a real-time temperature difference between the second exhaust pipe (141) and the first exhaust pipe (121) is calculated; According to the difference between the real-time target temperature and the real-time temperature of the supply liquid in the heating and cooling circuit (17), the opening of the first regulating valve (181) is adjusted, and the opening of the second regulating valve (191) is adjusted simultaneously with the opening of the first regulating valve (181); The opening of the second regulating valve (191) is adjusted according to whether the calculated real-time temperature difference between the second exhaust pipeline (141) and the first exhaust pipeline (121) is within a set temperature difference range.

4. The control method of the linear temperature rise and fall system according to claim 3, characterized in that: The method for adjusting the opening of the second regulating valve (191) is as follows: When the real-time temperature difference between the second exhaust pipeline (141) and the first exhaust pipeline (121) is within the set temperature difference range, the second regulating valve (191) and the first regulating valve (181) maintain the same opening degree; When the real-time temperature difference between the second exhaust pipeline (141) and the first exhaust pipeline (121) exceeds the set temperature difference range, the opening of the first regulating valve (181) remains unchanged, and the opening of the second regulating valve (191) is adjusted according to the real-time temperature difference between the second exhaust pipeline (141) and the first exhaust pipeline (121).

5. The control method of the linear temperature rise and fall system according to claim 4, characterized in that: The set temperature difference range includes a maximum limit temperature difference and a minimum limit temperature difference. According to the real-time temperature difference between the second exhaust pipeline (141) and the first exhaust pipeline (121), the specific steps of adjusting the opening of the second regulating valve (191) include: When the real-time temperature difference between the second exhaust pipeline (141) and the first exhaust pipeline (121) is greater than the maximum limit temperature difference, reducing the opening of the second regulating valve (191); When the real-time temperature difference between the second exhaust pipeline (141) and the first exhaust pipeline (121) is less than the minimum limit temperature difference, the opening of the second regulating valve (191) is increased.

6. Linear temperature rise and fall system, characterized in that: The control method of the linear temperature rise and fall system according to any one of claims 1 to 5 is adopted, wherein the linear temperature rise and fall system comprises: A refrigerant device (1) comprises an expansion tank (11), a cold storage tank (12), a heating tank (14), a first heat exchange component (13) and a second heat exchange component (15); the expansion tank (11) is used to provide a refrigerant for the cold storage tank (12) and the heating tank (14) and to cause thermal expansion of the refrigerant when the temperature rises; the cold storage tank (12) is connected to the first heat exchange component (13) to form a cold storage circuit (16); the heating tank (14) is connected to a client load (100) via the second heat exchange component (15) to form a heating and cooling circuit (17 ), used for heating and cooling the client load (100); the outlet of the cold storage tank (12) is connected to the inlet of the heating tank (14) via a first regulating pipeline (18), and the first regulating pipeline (18) can regulate the flow rate of the coolant entering the heating tank (14) from the cold storage tank (12); the outlet of the heating tank (14) is connected to the inlet of the cold storage tank (12) via a second regulating pipeline (19), and the second regulating pipeline (19) can regulate the flow rate of the coolant entering the cold storage tank (12) from the heating tank (14); A first refrigeration device (2) and a second refrigeration device (3), wherein the first refrigeration device (2) is connected to the first heat exchange component (13) and is used to reduce the temperature of the cold storage tank (12); and the second refrigeration device (3) is connected to the second heat exchange component (15) and is used to reduce the temperature of the heating tank (14).

7. The linear temperature rise and fall system according to claim 6, characterized in that: The first regulating pipeline (18) is provided with a first regulating valve (181), and the first regulating valve (181) is used to regulate the flow rate of the coolant entering the heating tank (14) from the cold storage tank (12); The second regulating pipeline (19) is provided with a second regulating valve (191), and the second regulating valve (191) is used to regulate the flow rate of the coolant entering the cold storage tank (12) from the heating tank (14).

8. The linear temperature rise and fall system according to claim 6, characterized in that: The first heat exchange component (13) comprises an internal circulation pump (131) and a first evaporator (132); the outlet of the cold storage tank (12) is connected to the inlet of the first evaporator (132) via the internal circulation pump (131); and the outlet of the first evaporator (132) is connected to the inlet of the cold storage tank (12); The second heat exchange component (15) comprises an external circulation pump (151) and a second evaporator (152); the outlet of the heating tank (14) is connected to the inlet of the client load (100) via the external circulation pump (151); the outlet of the client load (100) is connected to the inlet of the second evaporator (152); and the outlet of the second evaporator (152) is connected to the inlet of the heating tank (14).

9. The linear temperature rise and fall system according to claim 8, characterized in that: One end of the first regulating pipeline (18) is connected to the outlet of the first evaporator (132), and the other end is connected to the inlet of the heating tank (14); One end of the second regulating pipeline (19) is connected to the outlet of the heating tank (14), and the other end is connected to the inlet of the internal circulation pump (131).

10. The linear temperature rise and fall system according to claim 8, characterized in that: The first refrigeration device (2) comprises a first compressor (21), a first condenser (22) and a first expansion valve (23); the first evaporator (132) is connected to the first compressor (21); the first compressor (21) is connected to the first condenser (22); the first condenser (22) is connected to the first evaporator (132) via the first expansion valve (23); The second refrigeration device (3) comprises a second compressor (31), a second condenser (32) and a second expansion valve (33); the second evaporator (152) is connected to the second compressor (31); the second compressor (31) is connected to the second condenser (32); and the second condenser (32) is connected to the second evaporator (152) via the second expansion valve (33); The liquid inlet of the first condenser (22) and the liquid inlet of the second condenser (32) are both connected to the coolant inlet pipe (4), and the liquid outlet of the first condenser (22) and the liquid outlet of the second condenser (32) are both connected to the coolant outlet pipe (5).

11. The linear temperature rise and fall system according to any one of claims 6 to 10, characterized in that: The volume of the cold storage tank (12) is ≥ the volume of the heating tank (14) × 3.

12. The linear temperature rise and fall system according to any one of claims 6 to 10, characterized in that: The exhaust port of the cold storage tank (12) is connected to the air inlet of the expansion tank (11) via a first exhaust pipeline (121), and the exhaust port of the heating tank (14) is connected to the air inlet of the expansion tank (11) via a second exhaust pipeline (141).

13. The linear temperature rise and fall system according to claim 12, characterized in that: The first exhaust gas pipeline (121) is provided with a first exhaust gas temperature sensor (1211), and the second exhaust gas pipeline (141) is provided with a second exhaust gas temperature sensor (1411).

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