Refrigerating system based on elastic heat effect

Abstract

The invention relates to the technical field of solid-state refrigeration, and provides a refrigeration system based on a thermoelastic effect, which comprises a heat exchanger, a thermoelastic material, a thermoacoustic engine and a transmission assembly, the heat exchanger comprises a cold-end heat exchanger and a hot-end heat exchanger which are oppositely arranged in the first direction. The elastic heat material is arranged between the cold end heat exchanger and the hot end heat exchanger; the heat exchanger can reciprocate in the first direction, and the elastic heat material can be stretched by loading stress in the second direction perpendicular to the first direction. The thermoacoustic engine is in transmission connection with the elastic heat material and the heat exchanger through the transmission assembly. The transmission assembly is used for converting driving of the thermo-acoustic engine into component motion in the first direction and loading force in the second direction. Compared with a traditional elastic heating refrigerating system driven by a motor, the structure is simplified, and cost is saved; the thermo-acoustic engine has no moving parts, so that the use of the moving parts is reduced, and the elastic heating refrigerating system is more compact and efficient; the thermo-acoustic engine can be driven by low-grade heat, so that the energy utilization rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state refrigeration, and in particular to a refrigeration system based on elastocaloric effect. Background Art

[0002] At present, vapor compression refrigeration technology that uses refrigerants for refrigeration has been widely used in various fields such as refrigerators and air conditioners. However, the environmental problems caused by the use of refrigerants are becoming increasingly prominent, so the development of new refrigeration technology has received widespread attention.

[0003] As a new type of solid-state refrigeration technology, elastocaloric refrigeration technology does not require the use of refrigerants, so it will not have a negative impact on the environment and is a green and environmentally friendly refrigeration method. When the internal stress of the elastocaloric material changes, it can be converted between martensite and austenite, thereby realizing the change of the temperature of the elastocaloric material itself and achieving the purpose of refrigeration.

[0004] In the prior art, the elastic-caloric refrigeration system generally realizes the stretching, unloading and heat exchange of the elastic-caloric material through motor drive, and has many moving parts and a complex composition. Summary of the invention

[0005] The present invention provides a refrigeration system based on the caloric effect, which is used to reduce the problems of many moving parts and complex composition of the caloric refrigeration system in the prior art, and simplifies the structure of the caloric refrigeration system, making the caloric system more compact and efficient as a whole.

[0006] The present invention provides a refrigeration system based on elasto-caloric effect, comprising: a heat exchanger, an elasto-caloric material, a thermoacoustic engine and a transmission component;

[0007] The heat exchanger comprises a cold end heat exchanger and a hot end heat exchanger which are arranged opposite to each other along a first direction; the elastic thermal material is arranged between the cold end heat exchanger and the hot end heat exchanger;

[0008] The heat exchanger can reciprocate along a first direction, so that the thermoelastic material contacts the cold end heat exchanger or the hot end heat exchanger. The thermoelastic material can be stretched by a stress applied along a second direction perpendicular to the first direction. When the thermoelastic material is stretched, it contacts the hot end heat exchanger; when the thermoelastic material is reset, it contacts the cold end heat exchanger.

[0009] The thermoacoustic engine is connected to the elastic thermal material and the heat exchanger through the transmission component; the transmission component is used to convert the drive of the thermoacoustic engine into a partial movement of the heat exchanger along a first direction and a loading force of the elastic thermal material along a second direction.

[0010] According to a refrigeration system based on elastocaloric effect provided by the present invention, the cold-end heat exchanger and the hot-end heat exchanger are connected as a whole via a mechanical connector.

[0011] According to a refrigeration system based on elastic-caloric effect provided by the present invention, the transmission assembly includes a first push rod, a second push rod, a guide portion and a connecting portion;

[0012] The first push rod and the second push rod are both drivingly connected to the thermoacoustic engine and can slide back and forth along the second direction under the drive of the thermoacoustic engine;

[0013] One end of the elastic thermal material is fixed, and the other end is fixedly connected to the first push rod;

[0014] The guide portion is fixedly connected to the second push rod and is transmission-connected to the connecting portion;

[0015] The connecting portion can slide along a first direction, and the force exerted on the connecting portion by the guiding portion can be decomposed into a component force along the first direction;

[0016] The heat exchanger can slide along the first direction and be constrained in the first direction, and the connecting portion is fixedly connected to the heat exchanger to drive the heat exchanger to reciprocate along the first direction.

[0017] According to a refrigeration system based on elastic-caloric effect provided by the present invention, a guide groove is provided on the connecting portion, and the guide groove is arranged at an angle with the first direction and the second direction;

[0018] The guide portion is constrained in the guide groove and can slide along the guide groove.

[0019] According to a refrigeration system based on elastocaloric effect provided by the present invention, the guide portion is a spherical structure.

[0020] According to a refrigeration system based on elasto-caloric effect provided by the present invention, the thermoacoustic engine has a pressure output port; the transmission assembly also includes:

[0021] a sliding cavity, arranged along the second direction and having one end connected to the pressure output port;

[0022] A piston, slidably connected in the sliding chamber;

[0023] A transmission rod has one end fixedly connected to the piston; the first push rod and the second push rod are fixedly connected to the transmission rod.

[0024] A refrigeration system based on elastocaloric effect provided by the present invention further includes:

[0025] A slide rail, arranged along the first direction;

[0026] The slider is slidably connected to the slide rail and fixedly connected to at least one of the hot end heat exchanger, the cold end heat exchanger and the mechanical connector.

[0027] According to a refrigeration system based on elastocaloric effect provided by the present invention, the thermoacoustic engine is a traveling wave thermoacoustic engine or a standing wave thermoacoustic engine.

[0028] According to a refrigeration system based on elastocaloric effect provided by the present invention, the thermoacoustic engine includes a resonance tube, and a heater, a regenerator and a cooler arranged in the resonance tube in sequence; the resonance tube is used to fill the working medium, and the pressure output port is connected to the resonance tube.

[0029] According to a refrigeration system based on elastocaloric effect provided by the present invention, the working fluid in the thermoacoustic engine is a liquid working fluid.

[0030] According to a refrigeration system based on elastocaloric effect provided by the present invention, the resonance tube is a meander tube or a straight tube.

[0031] According to a refrigeration system based on elastocaloric effect provided by the present invention, the resonance tube is connected to a pressure output port.

[0032] According to a refrigeration system based on elastocaloric effect provided by the present invention, the pressure output port is arranged on the same side as the heater.

[0033] The refrigeration system based on the caloric effect provided by the present invention can convert the drive of the thermoacoustic engine into the partial movement of the heat exchanger along the first direction and the loading force of the caloric material along the second direction through the transmission component. When the heat exchanger moves along the first direction to make the hot end heat exchanger close to the caloric material, the caloric material is gradually stretched along the second direction to undergo a martensitic phase transformation, and its own temperature increases. After the caloric material contacts the hot end heat exchanger, it releases heat to the environment; when the heat exchanger moves along the first direction to make the cold end heat exchanger close to the caloric material, the stress applied to the caloric material is unloaded, the caloric material changes from martensite back to austenite, and its own temperature decreases. After the caloric material contacts the cold end heat exchanger, it releases cold to the environment. Compared with the traditional multi-motor driven caloric refrigeration system, the structure is simplified and the cost is saved. In addition, the thermoacoustic engine itself has no moving parts, thereby reducing the use of moving parts, making the caloric refrigeration system more compact and efficient; in addition, the thermoacoustic engine can be driven by low-grade heat. Therefore, the thermoacoustic engine is used as the power generation part of the caloric refrigeration system to improve energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is one of the structural schematic diagrams of the refrigeration system based on elastocaloric effect provided in an embodiment of the present invention;

[0036] Figure 2 This is the second structural schematic diagram of the refrigeration system based on elastocaloric effect provided by an embodiment of the present invention;

[0037] Figure 3 This is the third structural schematic diagram of the refrigeration system based on the caloric effect provided in an embodiment of the present invention.

[0038] Reference numerals:

[0039] 1. Heat exchanger; 10. Cold end heat exchanger; 11. Hot end heat exchanger; 2. Elastic heat material; 3. Thermoacoustic engine; 30. Standing wave resonance tube; 31. Heater; 32. Regenerator; 33. Cooler; 34. Pressurization port; 35. Traveling wave resonance tube; 4. Transmission assembly; 40. Sliding cavity; 41. Piston; 42. Transmission rod; 43. First push rod; 44. Second push rod; 45. Connecting part; 450. Guide groove; 46. Guide part; 5. Mechanical connector; 6. Slide rail; 7. Slider. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In order to facilitate understanding of the refrigeration system based on caloric effect provided by the present invention, its application background is first explained. With the widespread application of vapor compression refrigeration technology, the environmental problems caused by refrigerants are becoming increasingly prominent, and the development of new refrigeration technology is also receiving increasing attention.

[0042] Elastic-caloric refrigeration technology is a new type of solid-state refrigeration technology that does not require the use of refrigerants and therefore does not have a negative impact on the environment. When the internal stress of the elastomeric material changes, it can transform between martensite and austenite, causing the temperature of the elastomeric material itself to change, thereby achieving the purpose of refrigeration.

[0043] Thermoacoustic engines can realize the mutual conversion of thermal and acoustic energy, and have the characteristics of no moving parts. Therefore, they have the advantages of simple structure, high reliability and long life.

[0044] Based on the above, the present invention provides a refrigeration system based on the caloric effect, which is used to reduce the problem of multiple moving parts and complex composition of the caloric refrigeration system driven by multiple motors in the prior art, and to simplify the structure of the caloric refrigeration system, making the caloric system as a whole more compact and efficient.

[0045] Combine the following Figure 1-Figure 3 The refrigeration system based on the elastocaloric effect of the present invention is described.

[0046] Reference Figure 1 and Figure 2 ,in, Figure 1 It shows a schematic diagram of the structure of the elasto-caloric material in the refrigeration system under stress loading; Figure 2 It shows a schematic diagram of the structure of the elasto-caloric material in the refrigeration system under stress unloading state; Figure 1 and Figure 2 The refrigeration systems in the machine are all driven by standing wave thermoacoustic engines.

[0047] A refrigeration system based on the elastocaloric effect includes a heat exchanger 1, an elastocaloric material 2, a thermoacoustic engine 3 and a transmission component 4; wherein the heat exchanger 1 includes a cold-end heat exchanger 10 and a hot-end heat exchanger 11; the cold-end heat exchanger 10 and the hot-end heat exchanger 11 are arranged at intervals along a first direction; and the elastocaloric material 2 is arranged between the cold-end heat exchanger 10 and the hot-end heat exchanger 11.

[0048] The heat exchanger 1 as a whole can reciprocate along the first direction, so that the elastic thermomaterial 2 can contact the cold-end heat exchanger 10 or the hot-end heat exchanger 11. The elastic thermomaterial 2 can be loaded with stress and stretched or unloaded with stress to recover the deformation along the second direction perpendicular to the first direction. When the elastic thermomaterial 2 is loaded with stress and stretched, it contacts the hot-end heat exchanger 11 to release heat to the external environment. When the elastic thermomaterial 2 is unloaded with stress and recovered, it contacts the cold-end heat exchanger 10 to release cold to the outside world to achieve the purpose of refrigeration.

[0049] The thermoacoustic engine 3 is connected to the elastic thermomaterial 2 and the heat exchanger 1 through a transmission assembly 4, and the transmission assembly 4 is used to convert the drive of the thermoacoustic engine 3 into a partial movement of the heat exchanger 1 along a first direction and a loading force of the elastic thermomaterial 2 along a second direction.

[0050] In actual work, the drive of the thermoacoustic engine 3 can be converted into a partial movement of the heat exchanger 1 along the first direction and a loading force of the elastic thermomaterial 2 along the second direction through the transmission component 4. When the heat exchanger 1 moves along the first direction to make the hot end heat exchanger 11 close to the elastic thermomaterial 2, the elastic thermomaterial 2 is gradually stretched along the second direction and undergoes a martensitic phase transformation. The phase transformation process releases latent heat to increase the temperature of the elastic thermomaterial 2. When the elastic thermomaterial 2 contacts the hot end heat exchanger 11, it releases heat to the environment.

[0051] When the heat exchanger 1 moves along the first direction so that the cold end heat exchanger 10 is close to the elastic thermomaterial 2, the stress applied to the elastic thermomaterial 2 is unloaded. Because its stress is less than the critical stress of phase change, the elastic thermomaterial 2 changes from martensite back to austenite. The reverse phase change process absorbs heat to supplement the latent heat of phase change. When the elastic thermomaterial 2 contacts the cold end heat exchanger 10, it releases cold to the environment to achieve the purpose of refrigeration.

[0052] Compared with the traditional multi-motor driven elastic caloric refrigeration system, the structure is simplified and the cost is saved. In addition, the thermoacoustic engine 3 itself has no moving parts, thereby reducing the use of moving parts and making the elastic caloric refrigeration system more compact and efficient. In addition, the thermoacoustic engine 3 can be driven by low-grade heat. Therefore, the use of the thermoacoustic engine 3 as the power generating part of the elastic caloric refrigeration system improves energy utilization.

[0053] The thermoacoustic engine 3 is provided with a pressure output port for outputting pressure oscillations; the transmission assembly 4 includes a sliding chamber 40, a piston 41, a transmission rod 42, a first push rod 43, a second push rod 44, a connecting portion 45 and a guiding portion 46; wherein the sliding chamber 40 is arranged along the second direction and one end thereof is connected to the pressure output port; the piston 41 is slidably fitted in the sliding chamber 40, and the pressure oscillation outputted from the pressure output port can be converted into the power of the piston 41, so that the piston 41 slides back and forth along the first direction. The end of the transmission rod 42 is fixedly connected to the piston 41 for providing power output.

[0054] The piston 41 may be provided with one or two at intervals. When two pistons 41 are provided at intervals, the two ends of the transmission rod 42 are fixedly connected to the two pistons 41 respectively. The two pistons 41 can provide support for the two ends of the transmission rod 42, which is beneficial to improve the stability of the transmission rod 42.

[0055] One end of the first push rod 43 and the second push rod 44 are fixedly connected to the transmission rod 42, so that the transmission rod 42 can drive the first push rod 43 and the second push rod 44 to slide back and forth along the second direction; the elastic thermo material 2 is arranged along the second direction, one end of which is fixed, and the other end is fixedly connected to the end of the first push rod 43 away from the transmission rod 42, so that the first push rod 43 can slide back and forth along the second direction driven by the transmission rod 42, thereby pulling the elastic thermo material 2 to realize stress loading and unloading.

[0056] The cold-end heat exchanger 10 and the hot-end heat exchanger 11 are connected as a whole through a mechanical connector 5, thereby realizing the overall movement of the heat exchanger 1; the mechanical connector 5 includes but is not limited to components such as connecting rods and connecting plates. As long as the components can realize the connection of the cold-end heat exchanger 10 and the hot-end heat exchanger 11 as a whole, they can be applied to the present invention.

[0057] The heat exchanger 1 as a whole can slide along the first direction and be constrained in the first direction. For example, the sliding direction of the heat exchanger 1 can be constrained by using a slide rail 6 and a slider 7 that cooperate with each other; wherein the slide rail 6 is arranged along the first direction; the slider 7 is slidably connected to the slide rail 6, and the slider 7 can be fixedly connected to at least one of the cold end heat exchanger 10, the hot end heat exchanger 11 and the mechanical connector 5, so as to constrain the heat exchanger 1 as a whole in the first direction. In this embodiment, the slider 7 is fixedly connected to the mechanical connector 5.

[0058] It is understandable that the slider 7 and the slide rail 6 can be equivalently replaced by a guide rod and a sleeve, an optical axis guide rail and a linear bearing, etc., and any structure that can slide the heat exchanger 1 as a whole and constrain it in the first direction is applicable.

[0059] The connecting portion 45 can slide along the first direction, and is fixedly connected to the heat exchanger 1; the guiding portion 46 is fixedly connected to the end of the second push rod 44 away from the transmission rod 42, so that the second push rod 44 can drive the guiding portion 46 to slide back and forth along the second direction; the connecting portion 45 is in transmission connection with the guiding portion 46, and when the guiding portion 46 slides back and forth along the second direction, a force is applied to the connecting portion 45, and the force applied by the guiding portion 46 to the connecting portion 45 can be decomposed into a component force along the first direction, so as to drive the connecting portion 45 to slide back and forth along the first direction, thereby driving the heat exchanger 1 as a whole to reciprocate along the first direction, so that the elastic thermal material 2 alternately contacts and exchanges heat with the cold end heat exchanger 10 and the hot end heat exchanger 11.

[0060] Specifically, the connecting portion 45 is a slider structure and is provided with a guide groove 450. The guide groove 450 is set at an angle to the first direction and the second direction. The guide portion 46 is constrained in the guide groove 450 and can slide along the guide groove 450. When the second push rod 44 drives the guide portion 46 to slide back and forth along the second direction, the guide portion 46 simultaneously moves along the extension direction of the guide groove 450, thereby driving the connecting portion 45 to slide along the first direction.

[0061] Specifically, the guide portion 46 is a spherical structure, which is used to reduce the friction resistance between the guide portion 46 and the connecting portion 45, so that the guide portion 46 can drive the connecting portion 45 more smoothly.

[0062] In another embodiment, the guide portion 46 is a slider structure and is provided with a guide groove 450, which is set at an angle to both the first direction and the second direction; the end of the second push rod 44 away from the transmission rod 42 is fixedly connected to the guide portion 46, so that the second push rod 44 can drive the guide portion 46 to slide back and forth along the first direction; the connecting portion 45 is fixedly connected to the heat exchanger 1, and the connecting portion 45 can move along the first direction and be constrained in the guide groove 450. When the second push rod 44 drives the guide portion 46 to reciprocate along the second direction, the connecting portion 45 can be driven to reciprocate along the first direction under the action of the guide groove 450, thereby driving the heat exchanger 1 to reciprocate along the first direction, so that the elastic thermal material 2 alternately contacts and exchanges heat with the cold end heat exchanger 10 and the hot end heat exchanger 11.

[0063] It is understandable that the connection portion 45 and the guide portion 46 are not limited to the above-mentioned structure and matching method, and other structures that can enable the guide portion 46 to drive the connection portion 45 to reciprocate along the first direction are applicable to the present invention.

[0064] In actual operation, the pressure oscillation is output through the pressure output port of the thermoacoustic engine 3, driving the piston 41 to slide back and forth in the sliding chamber 40, and the transmission rod 42 drives the first push rod 43 and the second push rod 44 to slide back and forth along the second direction. Under the action of the first push rod 43, the stress is loaded or unloaded on the elastic thermo material 2 along the second direction to achieve the phase change conversion of the elastic thermo material 2; at the same time, the second push rod 44 drives the guide part 46 to slide back and forth along the second direction, and the force applied by the guide part 46 to the connecting part 45 can be decomposed into a component force along the first direction, thereby driving the connecting part 45 to reciprocate along the first direction. Driven by the connecting part 45, the heat exchanger 1 as a whole reciprocates along the first direction, alternately contacting the cold end heat exchanger 10 and the hot end heat exchanger 11 to achieve a cooling effect.

[0065] Specifically, the thermoacoustic engine 3 can be a traveling wave thermoacoustic engine or a standing wave thermoacoustic engine, both of which can convert thermal energy into mechanical energy of the internal fluid working medium and output it through the pressure output port to drive the piston 41 to slide back and forth in the sliding chamber 40.

[0066] In one embodiment, referring to Figure 1 and Figure 2 The standing wave thermoacoustic engine includes a resonance tube, a heater 31, a regenerator 32 and a cooler 33; wherein the resonance tube is a standing wave resonance tube 30, which is arranged as a straight tube, and the pressure output port is arranged at one end of the standing wave resonance tube 30; the heater 31, the regenerator 32 and the cooler 33 are arranged in the standing wave resonance tube 30 in sequence, and the heater 31 and the cooler 33 can form a high temperature end and a low temperature end at both ends of the regenerator 32 respectively, thereby establishing a temperature gradient in the regenerator 32. When the temperature gradient exceeds the oscillation critical value, the fluid working medium in the system will oscillate and generate pressure fluctuations.

[0067] Specifically, the resonance tube is connected with a pressurizing port 34 for pressurizing the fluid inside; the regenerator 32 is a porous medium, and its structure can be parallel flow channels, porous foam, stacked wire mesh, etc. The cooler 33 can achieve cooling by water cooling, air cooling or radiation cooling.

[0068] Specifically, the whole composed of the heater 31, the heat regenerator 32 and the cooler 33 needs to deviate from the middle of the standing wave resonance tube 30, that is, the three need to be close to one end of the standing wave resonance tube 30 to ensure efficient output of the pressure wave. No matter which end of the standing wave resonance tube 30 the three are close to, the heater 31 is closer to the end of the standing wave resonance tube 30 than the cooler 33, and the pressurizing port 34 is arranged at the other end of the standing wave resonance tube 30 away from the pressure output port.

[0069] Specifically, the frequency of the pressure wave depends on the characteristics of the fluid working medium and the length of the standing wave resonance tube 30. Therefore, according to actual needs, the two can be adjusted to adjust the output pressure wave frequency to meet the driving requirements. In this embodiment, the output frequency of the pressure wave is about 5 Hz.

[0070] In another embodiment, referring to Figure 3 The traveling wave thermoacoustic engine includes a resonance tube, and a heater 31, a regenerator 32 and a cooler 33 which are sequentially arranged in the resonance tube; wherein the resonance tube is a traveling wave resonance tube 35 which is arranged as a meandering tube, and the pressure output port is arranged on one side of the traveling wave resonance tube 35.

[0071] Specifically, the circumference of the traveling wave resonance tube 35 is equal to the wavelength of a sound wave, the pressure output port is arranged close to the heater 31 , and the pressurizing port 34 is arranged close to the cooler 33 .

[0072] Specifically, in order to improve the thermal-acoustic conversion efficiency, a capacitive tube or a resistive tube can be added to the traveling wave resonance tube 35; wherein the cross-sectional area of ​​the capacitive tube is larger than the cross-sectional area of ​​the traveling wave resonance tube 35, and the distance between the capacitive tube and the regenerator 32 is equal to one-fourth of the circumference of the traveling wave resonance tube 35, that is, one-fourth of the wavelength of the sound wave. The cross-sectional area of ​​the resistive tube is smaller than the cross-sectional area of ​​the traveling wave resonance tube 35, and the distance between the resistive tube and the regenerator 32 is equal to one-half of the circumference of the traveling wave resonance tube 35, that is, one-half of the wavelength of the sound wave.

[0073] In a specific embodiment, the fluid working medium in the thermoacoustic engine 3 is a liquid working medium. Compared with a gas working medium, the isothermal compressibility of a liquid working medium is much lower than that of a gas working medium. Therefore, under a certain acoustic power output, a much larger pressure amplitude can be obtained than that of a gas working medium, and the velocity amplitude is correspondingly smaller than that of a gas working medium. An acoustic power flow rate of tens of watts can be accompanied by a pressure amplitude of several megapascals, thereby providing a sufficiently large driving force. In addition, the compressibility of the liquid is low, and only a small amount of gas, such as nitrogen, helium or argon, which does not react with the liquid working medium, needs to be injected through a pressurizing device to rapidly increase the pressure in the resonance tube.

[0074] The type of liquid working fluid can be selected from any one of liquid sodium, mercury and propylene according to actual needs. Depending on the type of liquid working fluid selected, the starting temperature and the critical value of the starting temperature gradient will also be different. The temperatures of the heater 31 and the cooler 33 can be adaptively adjusted to achieve the starting conditions. In this embodiment, the liquid working fluid is liquid sodium, the cooling temperature of the cooler 33 is 110°C, and the heating temperature of the heater 31 is 480°C, so that a temperature gradient exceeding the critical value of the starting temperature is established in the regenerator 32, causing the liquid working fluid to oscillate.

[0075] The novelty of the present invention is that the drive of the thermoacoustic engine 3 can be converted into a partial movement of the heat exchanger 1 along the first direction and a loading force of the elastic thermomaterial 2 along the second direction through the transmission component 4. When the heat exchanger 1 moves along the first direction to bring the hot-end heat exchanger 11 close to the elastic thermomaterial 2, the elastic thermomaterial 2 is gradually stretched along the second direction and undergoes a martensitic phase transformation, and its own temperature increases. After the elastic thermomaterial 2 contacts the hot-end heat exchanger 11, it releases heat to the environment; when the heat exchanger 1 moves along the first direction to bring the cold-end heat exchanger 10 close to the elastic thermomaterial 2, the stress applied to the elastic thermomaterial 2 is unloaded, the elastic thermomaterial 2 changes from martensite back to austenite, and its own temperature decreases. After the elastic thermomaterial 2 contacts the cold-end heat exchanger 10, it releases cold to the environment. Compared with the traditional multi-motor driven elastic caloric refrigeration system, the structure is simplified and the cost is saved. In addition, the thermoacoustic engine 3 itself has no moving parts, thereby reducing the use of moving parts and making the elastic caloric refrigeration system more compact and efficient. In addition, the thermoacoustic engine 3 can be driven by low-grade heat. Therefore, the use of the thermoacoustic engine 3 as the power generating part of the elastic caloric refrigeration system improves energy utilization.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A refrigeration system based on elasto-caloric effect, characterized in that: include: Heat exchanger (1), elastic heat material (2), thermoacoustic engine (3) and transmission assembly (4); The heat exchanger (1) comprises a cold end heat exchanger (10) and a hot end heat exchanger (11) arranged opposite to each other along a first direction; the elastic thermal material (2) is arranged between the cold end heat exchanger (10) and the hot end heat exchanger (11); The heat exchanger (1) can reciprocate along a first direction, so that the thermoelastic material (2) contacts the cold-end heat exchanger (10) or the hot-end heat exchanger (11); the thermoelastic material (2) can be stretched by a stress applied along a second direction perpendicular to the first direction; when the thermoelastic material (2) is stretched, it contacts the hot-end heat exchanger (11); when the thermoelastic material (2) is reset, it contacts the cold-end heat exchanger (10); The thermoacoustic engine (3) is connected to the elastic thermomaterial (2) and the heat exchanger (1) through the transmission component (4); the transmission component (4) is used to convert the drive of the thermoacoustic engine (3) into a partial movement of the heat exchanger (1) along a first direction and a loading force of the elastic thermomaterial (2) along a second direction.

2. The refrigeration system based on elastocaloric effect according to claim 1, characterized in that: The cold end heat exchanger (10) and the hot end heat exchanger (11) are connected as a whole via a mechanical connector (5).

3. The refrigeration system based on elastocaloric effect according to claim 2, characterized in that: The transmission assembly (4) comprises a first push rod (43), a second push rod (44), a guide portion (46) and a connecting portion (45); The first push rod (43) and the second push rod (44) are both in driving connection with the thermoacoustic engine (3), and can slide back and forth along the second direction under the drive of the thermoacoustic engine (3); One end of the elastic thermal material (2) is fixed, and the other end is fixedly connected to the first push rod (43); The guide portion (46) is fixedly connected to the second push rod (44) and is transmission-connected to the connecting portion (45); The connecting portion (45) can slide along a first direction, and the force exerted by the guiding portion (46) on the connecting portion (45) can be decomposed into a component force along the first direction; The heat exchanger (1) can slide along the first direction and be constrained in the first direction, and the connecting portion (45) is fixedly connected to the heat exchanger (1) to drive the heat exchanger (1) to reciprocate along the first direction.

4. The refrigeration system based on elastocaloric effect according to claim 3, characterized in that: The connecting portion (45) is provided with a guide groove (450), and the guide groove (450) is arranged at an angle with the first direction and the second direction; The guide portion (46) is constrained in the guide groove (450) and can slide along the guide groove (450).

5. The refrigeration system based on elastocaloric effect according to claim 4, characterized in that: The guide portion (46) is a spherical structure.

6. The refrigeration system based on elastocaloric effect according to claim 3, characterized in that: The thermoacoustic engine (3) has a pressure output port; the transmission assembly (4) further comprises: A sliding cavity (40), arranged along the second direction and having one end connected to the pressure output port; A piston (41) is slidably connected in the sliding chamber (40); A transmission rod (42) has one end fixedly connected to the piston (41); the first push rod (43) and the second push rod (44) are fixedly connected to the transmission rod (42).

7. The refrigeration system based on elastocaloric effect according to claim 6, characterized in that: Also includes: A slide rail (6) arranged along the first direction; The slider (7) is slidably connected to the slide rail (6) and is fixedly connected to at least one of the hot end heat exchanger (11), the cold end heat exchanger (10) and the mechanical connector (5).

8. The refrigeration system based on elastocaloric effect according to any one of claims 1 to 7, characterized in that: The thermoacoustic engine (3) is a traveling wave thermoacoustic engine or a standing wave thermoacoustic engine.

9. The refrigeration system based on elastocaloric effect according to claim 6, characterized in that: The thermoacoustic engine (3) comprises a resonance tube, and a heater (31), a regenerator (32) and a cooler (33) which are sequentially arranged in the resonance tube; the resonance tube is used to be filled with a working medium, and the pressure output port is connected to the resonance tube.

10. The refrigeration system based on elastocaloric effect according to claim 1, characterized in that: The working fluid in the thermoacoustic engine (3) is a liquid working fluid.

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