Refrigerating system utilizing torsional elastic heat effect of shape memory alloy fibers

Abstract

A refrigeration system utilizing a torsional elastothermal effect of shape memory alloy fibers, the refrigeration system comprising: a) a torsional elastothermal refrigerator having a fluid inlet and two fluid outlets; the heat transfer fluid pipeline system comprises a refrigerator, a radiator, a three-way valve, a liquid storage buffer and a water pump, is provided with a motor, controls switching of cold and hot flow channels in pipeline circulation by controlling the three-way valve, and is connected with the torsion elastic heat refrigerator in the system; the heat exchange and storage device comprises but not limited to a spiral coil radiator made of copper pipes and a heat storage container, the spiral coil radiator and the heat storage container are both connected with the heat transfer fluid pipeline system, and the memory alloy fibers are arranged in the torsion elastic heat refrigerator. The system is based on a novel driving mode of a periodic distortion structure, and has the effects of high efficiency, low hysteresis and low driving stress.

Description

Technical Field

[0001] The present invention relates to solid-state refrigeration technology, specifically focusing on "elastic thermal refrigeration technology", and more particularly to a heat pump device based on twisted nickel-titanium alloy wires and utilizing periodic switching of fluids for heat exchange. Background Art

[0002] In the current field of household and industrial electricity consumption, cooling technology accounts for a significant proportion of energy consumption, about 20% of the total energy consumption. This high energy consumption is mainly due to the widely used traditional gas compression refrigeration technology, which not only has a low Carnot efficiency, usually less than 66%, but also a refrigeration density of about 0.035 J / cm 3 ·K, and there is a risk of coolant leakage, which poses a threat to the environment and aggravates the problem of global warming. With its comprehensive advantages such as high temperature span, high energy efficiency coefficient (COP value), simple operation and cost-effectiveness, elastic thermal refrigeration technology is recognized as the most promising alternative to steam compression refrigeration.

[0003] However, the development of elastic thermal cooling technology is still facing many challenges. In particular, the significant stress-strain hysteresis in tensile drive leads to a shortened material fatigue life and the linear material is easily damaged. Although compression drive has its advantages, it has high requirements on equipment and needs to solve the problems of heat transfer efficiency and material stability. Bending drive is limited by performance. These problems have seriously restricted the practical application and wide application of elastic thermal cooling technology. In response to the above challenges, the present invention aims to break through the limitations of the existing technology, propose a new driving method based on a periodic torsional deformation structure, and design a high-efficiency, low-hysteresis, and low-driving stress torsional thermal drive device. Summary of the invention

[0004] In order to solve the technical problems in the prior art, the present invention provides a refrigeration system using the torsional elasto-caloric effect of shape memory alloy fibers, and the technical solution adopted is:

[0005] A refrigeration system utilizing the torsional elasto-caloric effect of shape memory alloy fibers, the refrigeration system comprising:

[0006] a) a torsional elastomeric cooler having a fluid inlet and two fluid outlets;

[0007] b) a heat transfer fluid pipeline system, including a refrigerator, a radiator, a three-way valve, a liquid storage buffer, and a water pump, wherein a motor is provided, which controls the switching of the hot and cold channels in the pipeline circulation by controlling the three-way valve, and is connected to the torsional elastic heat refrigerator in the system;

[0008] c) heat exchange and heat storage devices, including but not limited to a spirally wound radiator made of copper tubes and a heat storage container, both of which are connected to a heat transfer fluid piping system, and memory alloy fibers are arranged in a torsional elastic heat refrigerator.

[0009] Furthermore, the shape memory alloy fiber is wrapped by the shell of the torsional elastic heat cooler and is longer than the size of the shell. There is a gap between the shell and the shape memory alloy fiber reserved for the circulation of heat transfer fluid, and the gap is connected to a heat transfer fluid inlet and two heat transfer fluid outlets; the two heat transfer fluid outlets include a cold fluid outlet and a hot fluid outlet; the portion of the shape memory alloy fiber that is longer than the shell is fixed by a clamping device, and the clamping device and the torsional elastic heat cooler are connected by an elastic silicone rubber tube to secure the shape memory alloy fiber and prevent leakage of the heat transfer fluid; one end of the clamping device can be inserted with the shape memory alloy fiber, and the other end is fixed to the drive motor, and the inserted shape memory alloy fiber is tightened by a knob.

[0010] Furthermore, the two outlets of the torsional thermal elastic refrigerator are respectively connected to two heat transfer fluid pipes, the two pipes converge at two ports of the three-way valve, the other port of the three-way valve connects the heat transfer fluid pipe to the liquid storage buffer, and then connects from the liquid storage buffer to the water pump, and finally returns to the inlet of the torsional thermal elastic refrigerator, forming a switchable dual-channel circulation; the three-way valve is fixed on the shaft of the stepper motor, and is driven by the stepper motor to periodically switch the refrigeration system flow channel according to the working state of the system; the liquid storage buffer is placed vertically, and the upper and lower ends are connected to the heat transfer fluid pipe, leaving openings for replenishing liquid and adjusting pressure; the heat transfer fluid pipe and its accessories are all covered with foam to achieve insulation.

[0011] Furthermore, the heat storage device includes: but is not limited to a spiral heat exchange tube connected to a heat transfer fluid pipeline, a heat storage tank, a heat storage liquid, a stirring magnet, a magnetic stirring table, and a heat storage liquid temperature measurement well; the heat transfer fluid flows into the heat exchange tube, exchanges heat with the heat storage liquid through the heat exchange tube, and uses a magnetic stirring magnet in the heat storage liquid to enhance convective heat transfer; the temperature measurement well is inserted with a temperature measuring device to measure the temperature of the heat storage liquid.

[0012] Furthermore, the heat dissipation device includes a spiral heat dissipation pipe and a fan, and the fan sends air to the heat dissipation pipe to accelerate the heat dissipation of the heat transfer fluid in the heat dissipation pipe.

[0013] A refrigeration system of a multi-stage torsional elastic heat refrigerator, further comprising: a) the multi-stage torsional elastic heat refrigerator adopts a plurality of torsional elastic heat refrigerator structures, the first stage torsional elastic heat refrigerator comprises a heat transfer fluid inlet and a heat transfer fluid outlet, and the heat transfer fluid outlets of each stage are connected end to end with the heat transfer fluid inlet of the next stage torsional elastic heat refrigerator, and the last torsional elastic heat refrigerator comprises two heat transfer fluid outlets; b) the torsional elastic heat refrigerators connected end to end are connected by pipes no longer than 2 cm and covered with thermal insulation foam.

[0014] A method for using a single-stage refrigeration system comprises the following steps:

[0015] a) Twisting heat generation process: The shape memory alloy fiber is rotated a certain number of times by a motor to reach a specific twist, causing the nickel-titanium alloy wire to heat rapidly due to the elastic-caloric effect;

[0016] b) Heat transfer by heat transfer fluid: The heated nickel-titanium alloy wire transfers heat to the heat transfer fluid by contacting with the continuously circulating heat transfer fluid. The heat transfer fluid carries the heat to the heat storage device and the heat dissipation device. After the outlet temperature of the torsional elastic heat cooler drops to a stable level, the three-way valve is controlled by the motor to switch to the cooling channel;

[0017] c) Untwisting and heat absorption process: The motor drives the nickel-titanium alloy wire to rotate in the opposite direction, and the twist of the nickel-titanium alloy wire is released to zero, so that the wire absorbs the heat of the heat transfer fluid and cools down rapidly;

[0018] d) Cooling of heat transfer fluid and waiting: The cooling nickel-titanium alloy wire exchanges heat with the heat transfer fluid again to reduce the temperature of the heat transfer fluid. When the outlet temperature of the torsional elastic thermocooler drops to a stable level, the motor controls the rotary three-way valve to switch back to the heating flow channel, preparing to enter the next cycle.

[0019] A method for using a refrigeration system of a multi-stage torsional elastic caloric refrigerator comprises the following steps:

[0020] a) Twisting of the first-stage torsion heating device: The first-stage shape memory alloy fiber is rotated a certain number of times by a motor drive to achieve a specific twist, and the temperature of the nickel-titanium alloy wire rises rapidly;

[0021] b) Temperature transfer: by waiting for a certain fluid transfer time, the continuously flowing heat transfer fluid will transfer the heat transfer fluid heated by the nickel-titanium alloy in the first stage of the heat twisting device to the second stage;

[0022] c) Secondary heat twisting device twisting: When the heated heat transfer fluid just flows completely into the second-stage heat twisting device, the second-stage heat twisting device twisting is started, the nickel-titanium alloy wire in the second-stage device heats up rapidly and further heats the heat transfer fluid transferred from the first stage, and then the multi-stage heat twisting device sequentially adopts the above-mentioned method to guide the cycle to the last stage;

[0023] d) After the outlet temperature of the last stage of the heat twisting device is stable, the three-way valve is switched by the rotating motor to switch the device flow channel;

[0024] After switching to the cooling process, the twisting heat device changes to an untwisting and cooling cycle, and the operation process is the same as the heating process and is repeated repeatedly.

[0025] The technical effects of the present invention are:

[0026] The present invention provides a refrigeration system using the torsional elasto-caloric effect of shape memory alloy fibers. The operation process of a heating / cooling cycle of the torsional thermal system is designed as follows to ensure that the heat generation and absorption, heat separation and transfer cycles are carried out stably. The system is based on a new driving method of a periodic torsional deformation structure, and has the effects of high efficiency, low hysteresis, and low driving stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of a single-stage refrigeration system of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure of the two-stage refrigeration system of the present invention.

[0029] Figure 3 It is a schematic diagram of the structure of the torsional elastic heat refrigerator of the present invention.

[0030] Figure 4 It is a schematic diagram of the structure of the heat dissipation device of the present invention.

[0031] Figure 5 It is a schematic diagram of the structure of the heat storage device of the present invention.

[0032] Figure 6 It is a schematic diagram of the operation mode of the refrigeration system of the present invention.

[0033] In the figure: 1, torsional elastic heat cooler; 2, heat dissipation device; 3, heat storage device; 4, three-way valve; 5, peristaltic pump; 6, liquid storage buffer; 7, clamping device; 8, silicone rubber tube; 9, heat transfer fluid inlet; 10, cold fluid outlet; 11, hot fluid outlet; 12, pressing knob; 13, torsional elastic heat cooler shell; 14, fan; 15, heat dissipation pipe; 16, heat exchange pipe; 17, magnetic stirring table; 18, stirring magnet; 19, heat storage tank; 20, thermal storage liquid temperature measurement well. 101, first stage cooler; 102, second stage cooler; 103, memory alloy fiber (nickel-titanium alloy wire). DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0035] See attached Figure 1The refrigeration system using the torsional elastic-caloric effect of shape memory alloy fiber of the present invention comprises: a) a torsional elastic-caloric refrigerator 1, which has a heat transfer fluid inlet 9 and two fluid outlets, the two outlets being a cold fluid outlet 10 and a hot fluid outlet 11; b) a heat transfer fluid pipeline system, on which a heat dissipation device 2, a heat storage device 3, a three-way valve 4, a peristaltic pump 5, and a liquid storage buffer 6 are arranged, wherein one passage of the three-way valve 4 is connected to the cold fluid outlet 10 through the heat dissipation device 2, another passage is connected to the hot fluid outlet through the heat storage device 3, and the middle third passage of the three-way valve is connected to the heat transfer liquid inlet 9 through the liquid storage buffer 6 and the peristaltic pump 5. The three-way valve 4 is connected to a motor, and the motor controls the switching of the cold and hot flow channels in the pipeline circulation of the three-way valve 4 to realize the circulation of the heat transfer fluid (Heat transfer flow, HTF) in the torsional elastic-caloric refrigerator 1; c) a heat dissipation device 2 and a heat storage device 3, including but not limited to a spirally coiled heat sink and a heat storage container made of copper pipes, both of which are connected to the heat transfer fluid pipeline system.

[0036] In the present invention, the two outlets of the torsional elastic thermal refrigerator 1 are respectively connected to two heat transfer fluid pipelines, the two pipelines converge at the two ports of the three-way valve 4, the other port of the three-way valve 4 connects the heat transfer fluid pipeline to the liquid storage buffer 6, and then connects from the liquid storage buffer 6 to the peristaltic pump 5, and finally returns to the heat transfer fluid inlet 9 of the torsional elastic thermal refrigerator 1, forming a switchable double-channel circulation; the three-way valve 4 is fixed on the rotating shaft of the stepper motor, and is driven by the stepper motor to periodically switch the refrigeration system flow channel according to the working state of the system; the liquid storage buffer 6 is placed vertically, and the upper and lower ends are connected to the heat transfer fluid pipeline, leaving openings for replenishing liquid and adjusting pressure; the heat transfer fluid pipeline and its accessories are all covered with foam to achieve insulation.

[0037] Example 1: Fabrication and construction of a single-stage torsion heat system

[0038] The twist heat refrigeration system of this embodiment is mainly divided into the following parts: 1. Twist heat device; 2. Heat transfer fluid (Heat transfer flow, HTF) pipeline system; 3. Heat exchange and heat storage device.

[0039] 1. Production of twist heat device:

[0040] See attached Figure 3The torsional heat device of the present invention, i.e., a torsional elastic heat refrigerator 1, includes a torsional device housing 13, both ends of which are provided with clamping devices 7, the clamping devices 7 are connected to the torsional elastic heat refrigerator 1 through a silicone rubber tube 8, one end of the torsional elastic heat refrigerator 1 is provided with a heat transfer fluid inlet 9, and the other end is provided with two fluid outlets. The shape memory alloy fiber (nickel-titanium alloy wire) 103 is inside the torsional elastic heat refrigerator 1, wrapped by the torsional elastic heat refrigerator shell 13, and is longer than the shell size. There is a gap between the torsional elastic heat refrigerator shell 13 and the shape memory alloy fiber reserved for the circulation of heat transfer fluid, and the gap is connected to a heat transfer fluid inlet and two heat transfer fluid outlets; the two heat transfer fluid outlets include a cold fluid outlet 10 and a hot fluid outlet 11; the part of the shape memory alloy fiber 103 longer than the shell is fixed by the clamping device 7, and the joint between the clamping device 7 and the torsional elastic heat refrigerator 1 is connected by an elastic silicone rubber tube 8 to ensure the shape memory alloy fiber and prevent leakage of the heat transfer fluid; one end of the clamping device 7 can be inserted with the shape memory alloy fiber, and the other end is fixed to the drive motor, and the inserted shape memory alloy fiber is tightened by the clamping knob 12 provided on the clamping device 7.

[0041] In the present invention, the shell 13 of the torsional elastic thermal refrigerator is made of a commercial polypropylene (PP) tube (outer diameter 4.45mm, inner diameter 1.65mm), which has a certain degree of heat isolation and support and wrapping device functions. A hole of about 0.8mm is drilled on the side about 10mm away from both ends, which is used to bond (bond with commercial resin glue) the heat transfer fluid HTF inlet and outlet pipes (1.0mm diameter stainless steel pipe). One end of the device is connected to an HTF inlet pipe, and the other end is bonded to two HTF outlet pipes. Thermocouples are placed on the HTF inlet and outlet pipes near the torsional elastic thermal refrigerator 1. Usually, the shell of the torsional elastic thermal refrigerator 1 is fixed on a screw bracket coaxially arranged with the motor, and the clamping devices 7 at both ends are mechanically fixed to the motor respectively.

[0042] The main shape of the clamping device 7 of the present invention is several equiaxial hollow cylinders of different diameters. Two screw holes are drilled on the sides and a clamping knob 12 is provided. The nickel-titanium alloy wire is tightened and squeezed to fix the wire. A polytetrafluoroethylene (PTFE) film is used to cover the surface of the clamping knob 12 to prevent liquid from seeping out of the gap between the threads after screwing in. The other end of the clamping device 7 is physically connected to the stepper motor clamp. The clamping device 7 is connected to the torsional elastic heat cooler housing 13 through a silicone rubber tube with an outer diameter of 6.0 mm and an inner diameter of 4.0 mm. Mechanical lubricating oil is applied to the joint to ensure that the torsional heat device can be sealed while the wire clamping device rotates.

[0043] 2. Construction of HTF pipeline system:

[0044] See attached Figure 1 and attached Figure 2The outlet of the torsional elastic caloric cooler equipped with a thermocouple is connected to a HTF transmission pipeline through a silicone tube with an outer diameter of 3.0 mm and an inner diameter of 1.0 mm. One of the two outlets flows out the cooled HTF, and the other outlet flows out the heated HTF. Usually, the hot and cold HTF pipelines are connected to the corresponding heat exchange device or heat storage device, and finally the pipeline flowing out of the heat dissipation device 2 or the heat storage device 3 is connected to the two inlets of the three-way valve 4 that controls the flow channel switching.

[0045] The knob of the three-way valve 4 is fixed to the stepper motor shaft by hot melt adhesive, and the remaining outlet is connected to the HTF pipeline to the liquid storage buffer 6, and then connected to the peristaltic pump 5 that provides the overall HTF flow power, and finally connected to the heat transfer fluid inlet 9 of the torsional elastic heat cooler, completing the construction of a complete set of closed circulation flow channels. When the HTF flow channel is actually working, the outer periphery is covered with a polyurethane (PU) foam protective sleeve for heat insulation, and the pipes are connected to each other with connectors.

[0046] 3. Heat exchange and heat storage device

[0047] See attached Figure 4 The heat dissipation device 2 includes a spiral heat dissipation pipe 15 and a fan 14. The heat dissipation pipe 15 is a 1.3m long copper pipe (outer diameter 2.5mm, inner diameter 1.0mm) spirally wound between the HTF pipes, and the fan 14 is used to blow air to increase convection heat exchange and accelerate the heat dissipation of the heat transfer fluid in the heat dissipation pipe 15.

[0048] The structure of HTF heat storage device is as follows Figure 4 As shown, the heat storage device 3 includes a heat storage tank 19, in which a spiral heat exchange tube 16 connected to a heat transfer fluid pipeline, a stirring magnet 18, a magnetic stirring platform 17, and a heat storage liquid temperature measurement well 20 are arranged. The heat storage tank 19 is provided with heat storage liquid. The heat transfer fluid flows into the heat exchange tube 16, exchanges heat with the heat storage liquid through the heat exchange tube 16, and uses the magnetic stirring magnet 18 in the heat storage liquid to enhance the convective heat transfer; the heat storage liquid temperature measurement well 20 is inserted into the heat storage liquid for measuring the temperature of the heat storage liquid. The heat exchange tube 16 inside the heat storage tank 19 is formed of a copper tube with an outer diameter of 2.5 mm and an inner diameter of 1.0 mm to form a spiral winding structure, and the two ends are connected to the HTF pipeline, and the copper tube is immersed in the heat storage liquid in the heat storage tank 19 for heat exchange. The outer periphery of the heat storage tank 19 is sprayed with polyurethane foam to wrap the heat storage tank, and the heat storage tank 19 uses a PP material container to store the heat exchange liquid. Three holes are opened above the heat storage tank 19 for the heat transfer copper tube and the thermocouple pipeline to pass through respectively. The container is filled with heat storage liquid and immersed in the heat exchange tube 16 and the stirring magnet 18. The stirring magnet 18 promotes the stirring of the liquid in the container to enhance the heat exchange. The stirring magnet 18 is placed on a magnetic stirring table. A heat storage liquid temperature measurement well 20 is provided in the middle of the device to facilitate the insertion of a thermocouple into the heat storage fluid to monitor the working condition of the heat storage device.

[0049] Example 2: Construction of a bipolar twisting heat device

[0050] Based on the above description, the refrigeration system of the present invention is not limited to a single-stage structure, and can be connected in series to achieve multi-stage connection. Figure 2 The connection structure of the two-stage refrigeration system is shown. Figure 2 It can be seen that the multi-stage torsional elastic caloric refrigerator adopts multiple torsional elastic caloric refrigerator structures, the first-stage refrigerator 101 includes a heat transfer fluid inlet and a heat transfer fluid outlet, and the heat transfer fluid outlets of each stage are connected end to end with the heat transfer fluid inlet of the second-stage refrigerator 102, and the second-stage refrigerator 102 includes two heat transfer fluid outlets.

[0051] The piping system and heat exchange equipment of the two-stage torsion heat system are the same as those of the single-stage torsion heat system. The first-stage torsion heat device is only provided with an inlet and an outlet at the end, which are fixed on the screw bracket. The second-stage torsion heat device is the same as the single-stage torsion heat device, with one inlet and two outlets, and the inlet is connected to the outlet of the first-stage torsion heat device, and the outlet is normally connected to two HTF transmission pipes. In order to avoid heat loss in the connection between the two-stage devices, the second-stage refrigerator 102 and the first-stage refrigerator 101 are connected only by a 10mm PP thin tube (outer diameter 2.0mm inner diameter 1.0mm) and thermal insulation isolation is adopted as much as possible. In order to compactly place the device, the second-stage refrigerator 102 is placed above the first-stage refrigerator 101.

[0052] Furthermore, by adopting a two-stage structure connection mode, the present invention can realize a multi-stage connection, and its connection mode is the same as the two-stage connection. The present invention does not limit this.

[0053] Example 3: Single-stage twist-caloric refrigeration device operation steps

[0054] See also Appendix Figure 1 The operation process of a heating / cooling cycle of the torsion heat system is designed with the following processes to ensure that the heat generation and absorption, heat separation and transfer cycles are carried out stably (the peristaltic pump 5 always maintains a stable flow rate during operation):

[0055] 1. Twisting heat generation: At a twisting speed of 50 turns / s, the nickel-titanium alloy wire is twisted to a specific twist, and the nickel-titanium alloy wire is quickly heated. Figure 6 As shown in a.

[0056] 2. HTF heat transfer: The continuously flowing HTF contacts the twisted nickel-titanium alloy wire to take away the generated heat and transfer it to the heat sink 2. The temperature of the HTF at the outlet of the torsional elastic heat cooler 1 will rise to the maximum value, and then wait for a period of time for the HTF temperature to drop to a stable value close to room temperature. After stabilization, the three-way valve 4 is controlled by the rotating motor to switch the device flow channel. Figure 6 As shown in b.

[0057] 3. Untwisting and heat absorption: The twist of the nickel-titanium alloy wire is removed at a speed of 50 turns / s, and the nickel-titanium alloy wire is quickly cooled. Figure 6 As shown in c.

[0058] 4. HTF cooling: The continuously flowing HTF fluid will absorb heat from the nickel-titanium alloy and lower its temperature, and then transfer it to the heat exchanger. Then wait for a period of time (t trans ) so that the HTF outlet temperature of the heat twisting device rises to a stable value close to room temperature. After stabilization, the motor rotates the three-way valve 4 to switch the flow channel back to the heating flow channel, and then returns to step 1 to complete a running cycle. Figure 6 As shown in d.

[0059] Example 4: Two-stage twisting heat refrigeration device operation steps

[0060] See also Appendix Figure 2 For a two-stage series-connected twist-caloric refrigerator, the cycle operation steps are as follows:

[0061] 1. First-stage twisting device twisting: At a twisting speed of 50 turns / s, the nickel-titanium alloy wire is twisted to a specific twist, and the temperature of the nickel-titanium alloy wire rises rapidly.

[0062] 2. Temperature transfer: By waiting for a certain fluid transfer interval, the continuously flowing HTF will transfer the HTF heated by the nickel-titanium alloy in the first-stage twist heat device to the second stage.

[0063] 3. Second-stage twisting device twisting: When the heated HTF just flows completely into the second-stage twisting device, the second-stage twisting device twisting is started. The nickel-titanium alloy wire in the second-stage device heats up rapidly and further heats the HTF transmitted from the first stage.

[0064] 4. HTF heat transfer: The continuously flowing HTF is further heated by the twisted nickel-titanium alloy wire and transferred to the heat exchanger. Wait for a while to allow the HTF temperature to drop to a stable value close to room temperature. After stabilization, the three-way valve switching device flow channel is switched by the rotating motor.

[0065] After switching to the cooling process, the twisting heat device changes to an untwisting and cooling cycle, and the operation process is similar to the heating process and is repeated repeatedly.

[0066] It should be further explained that the above implementation modes are only used to understand the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention. Any obvious adjustments and modifications made to the above implementation modes within the technical concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A refrigeration system utilizing the torsional elasto-caloric effect of shape memory alloy fibers, characterized in that: The refrigeration system includes: a) a torsional elastomeric cooler having a fluid inlet and two fluid outlets; b) a heat transfer fluid pipeline system, including a refrigerator, a radiator, a three-way valve, a liquid storage buffer, and a water pump, wherein a motor is provided, which controls the switching of the hot and cold channels in the pipeline circulation by controlling the three-way valve, and is connected to the torsional elastic heat refrigerator in the system; c) heat exchange and heat storage devices, including but not limited to a spirally wound radiator made of copper tubes and a heat storage container, both of which are connected to a heat transfer fluid piping system, and memory alloy fibers are arranged in a torsional elastic heat refrigerator.

2. The refrigeration system using the torsional elasto-caloric effect of shape memory alloy fibers as claimed in claim 1, characterized in that: The shape memory alloy fiber is wrapped by the torsional elastic heat refrigerator shell and is longer than the shell size. There is a gap between the shell and the shape memory alloy fiber reserved for the circulation of heat transfer fluid, and the gap is connected to a heat transfer fluid inlet and two heat transfer fluid outlets; the two heat transfer fluid outlets include a cold fluid outlet and a hot fluid outlet; The part of the shape memory alloy fiber longer than the shell is fixed by a clamping device, and the clamping device and the torsional elastic heat cooler are connected by an elastic silicone rubber tube to secure the shape memory alloy fiber and prevent leakage of the heat transfer fluid; One end of the clamping device can be inserted with a shape memory alloy fiber, and the other end is fixed to the driving motor. The inserted shape memory alloy fiber is tightened by a knob.

3. The refrigeration system using the torsional elasto-caloric effect of shape memory alloy fibers as claimed in claim 1, characterized in that: The two outlets of the torsional elastic heat cooler are respectively connected to two heat transfer fluid pipelines, the two pipelines converge at two ports of the three-way valve, the other port of the three-way valve is connected to the heat transfer fluid pipeline to the liquid storage buffer, and then connected from the liquid storage buffer to the water pump, and finally returns to the inlet of the torsional elastic heat cooler, forming a switchable double-channel circulation; The three-way valve is fixed on the rotating shaft of the stepper motor and is driven by the stepper motor to periodically switch the flow channel of the refrigeration system according to the working state of the system; The liquid storage buffer is placed vertically, with the upper and lower ends connected to the heat transfer fluid pipeline, and an opening is left to replenish liquid and adjust pressure; The heat transfer fluid pipeline and its accessories are all covered with foam to achieve thermal insulation.

4. The refrigeration system using the torsional elasto-caloric effect of shape memory alloy fibers as claimed in claim 1, characterized in that: The heat storage device includes: but is not limited to: a spiral heat exchange tube connected to a heat transfer fluid pipeline, a heat storage tank, a heat storage liquid, a stirring magnet, a magnetic stirring table, and a heat storage liquid temperature measurement well; The heat transfer fluid flows into the heat exchange tube, exchanges heat with the heat storage liquid through the heat exchange tube, and uses magnetic stirring magnets in the heat storage liquid to enhance convective heat transfer; The temperature measuring well is inserted with a temperature measuring device to measure the temperature of the thermal storage fluid.

5. The refrigeration system using the torsional elasto-caloric effect of shape memory alloy fibers as claimed in claim 1, characterized in that: The heat dissipation device comprises a spiral heat dissipation pipe and a fan, and the fan sends air to the heat dissipation pipe to accelerate the heat dissipation of the heat transfer fluid in the heat dissipation pipe.

6. The method for using the refrigeration system according to any one of claims 1 to 5, characterized in that The following steps are involved: a) Twisting heat generation process: The shape memory alloy fiber is rotated a certain number of times by a motor to reach a specific twist, causing the nickel-titanium alloy wire to heat rapidly due to the elastic-caloric effect; b) Heat transfer by heat transfer fluid: The heated nickel-titanium alloy wire transfers heat to the heat transfer fluid by contacting with the continuously circulating heat transfer fluid. The heat transfer fluid carries the heat to the heat storage device and the heat dissipation device. After the outlet temperature of the torsional elastic heat cooler drops to a stable level, the three-way valve is controlled by the motor to switch to the cooling channel; c) Untwisting and heat absorption process: The motor drives the nickel-titanium alloy wire to rotate in the opposite direction, and the twist of the nickel-titanium alloy wire is released to zero, so that the wire absorbs the heat of the heat transfer fluid and cools down rapidly; d) Cooling of heat transfer fluid and waiting: The cooling nickel-titanium alloy wire exchanges heat with the heat transfer fluid again to reduce the temperature of the heat transfer fluid. When the outlet temperature of the torsional elastic thermocooler drops to a stable level, the motor controls the rotary three-way valve to switch back to the heating flow channel, preparing to enter the next cycle.

7. A multi-stage torsional elastic caloric refrigerator refrigeration system, characterized by: A refrigeration system comprising any one of claims 1 to 5, a) The multi-stage torsional elastic heat refrigerator adopts a plurality of torsional elastic heat refrigerator structures, the first stage torsional elastic heat refrigerator comprises a heat transfer fluid inlet and a heat transfer fluid outlet, and the heat transfer fluid outlets of each stage are connected end to end with the heat transfer fluid inlet of the next stage torsional elastic heat refrigerator, and the last torsional elastic heat refrigerator comprises two heat transfer fluid outlets; b) The torsional elastic heat cooler is connected end to end, and the joints are connected by pipes no longer than 2cm and covered with thermal insulation foam.

8. The method for using the refrigeration system of the multi-stage torsional elastic caloric refrigerator according to claim 7, characterized in that The following steps are involved: a) Twisting of the first-stage torsion heating device: The first-stage shape memory alloy fiber is rotated a certain number of times by a motor drive to achieve a specific twist, and the temperature of the nickel-titanium alloy wire rises rapidly; b) Temperature transfer: by waiting for a certain fluid transfer time, the continuously flowing heat transfer fluid will transfer the heat transfer fluid heated by the nickel-titanium alloy in the first stage of the heat twisting device to the second stage; c) Secondary heat twisting device twisting: When the heated heat transfer fluid just flows completely into the second-stage heat twisting device, the second-stage heat twisting device twisting is started, the nickel-titanium alloy wire in the second-stage device heats up rapidly and further heats the heat transfer fluid transferred from the first stage, and then the multi-stage heat twisting device sequentially adopts the above-mentioned method to guide the cycle to the last stage; d) After the outlet temperature of the last stage of the heat twisting device is stable, the three-way valve is switched by the rotating motor to switch the device flow channel; After switching to the cooling process, the twisting heat device changes to an untwisting and cooling cycle, and the operation process is the same as the heating process and is repeated repeatedly.

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