Heat exchange enhanced heat-work coupling elastic-thermal refrigerating device based on topological configuration elastic micro-channel and system of heat exchange enhanced heat-work coupling elastic-thermal refrigerating device

Abstract

The utility model discloses a heat exchange enhanced heat-work coupling elastic-thermal refrigeration device based on a topological elastic micro-channel and a system thereof, a driving SMA bed is enabled to generate phase change through heat energy, the elastic-thermal effect of an elastic-thermal SMA is induced, the length ratio of the elastic-thermal SMA to the driving SMA is set to be 1: 2, the elastic-thermal SMA bed can realize larger phase change strain, and the elastic-thermal effect of the elastic-thermal SMA bed is enhanced. The latent heat released in the phase change process is larger; the two pieces of symmetrical elastic rubber are arranged in the fluid pipeline of the SMA bed, control over the system flow can be achieved, fluid is made to fully conduct convection heat exchange with the SMA bed, and the heat exchange efficiency of the refrigerating system is improved; transfer of cold energy is achieved through heat transfer fluid, refrigerating devices are used at the same time, alternate dissipation of the cold energy and heat energy of the system is achieved through the two elastic heat SMA beds, periodic cycle work can be stably and efficiently conducted, and the working efficiency of the refrigerating system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy and power, and particularly relates to a heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration device and system based on a topological configuration elastic microchannel. Background Art

[0002] Vapor compression refrigeration technology is currently widely used. However, the use of traditional refrigerants will release harmful gases, exacerbating global warming. With the improvement of people's awareness of resource conservation and environmental protection, this problem has received more attention. Therefore, traditional vapor compression refrigeration technology and the refrigerants it uses are facing urgent challenges and solutions need to be found.

[0003] As a solid-state refrigeration technology, elastocaloric refrigeration technology has solid-state refrigerants that do not diffuse into the atmosphere, is more environmentally friendly than traditional vapor compression refrigeration technology, and does not produce greenhouse gases during the refrigeration process. Therefore, it is considered to have zero GWP. It meets the characteristics of pollution-free and high reliability, and conforms to China's "dual carbon" goal and the background of energy conservation and emission reduction. Moreover, shape memory alloy (SMA) has high reliability. Even if it fails and needs to be repaired, the damaged alloy can be recycled. Therefore, it is a green cooling technology.

[0004] Chinese Patent Application Publication No. CN117760119A discloses a thermo-mechanical coupling elastocaloric refrigeration device, system and method based on antagonistic drive. By setting two sets of dually arranged drive SMA beds to achieve antagonistic drive and provide a stress field for the elastocaloric SMA bed, two sets of elastocaloric SMA beds can be used to achieve continuous output of cold energy. However, 1. The refrigeration system structure using SMA wires is relatively complex, and the operation technical difficulty is relatively large during the assembly process; 2. The lengths of the drive SMA wires and the refrigeration SMA wires used in this invention are the same. When the driving force provided by the drive SMA wires remains unchanged, the displacement of the sliding device is constant, and the phase change strain generated by the elastocaloric SMA wires is relatively small, resulting in relatively low system working efficiency; 3. In this invention, the flow rate change of the fluid cannot be controlled, and the fluid fails to fully convect and exchange heat with the drive SMA wires and the refrigeration SMA wires, resulting in low working efficiency. Summary of the Invention

[0005] Aiming at the technical defects existing in the prior art, the purpose of the present utility model is to provide a heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration device and system based on a topological configuration elastic microchannel. By setting a heat energy-driven shape memory alloy (SMA) to undergo a phase change, the elastocaloric effect of the elastocaloric SMA is induced. The length ratio of the elastocaloric SMA to the driving SMA is set to 1:2. The elastocaloric SMA bed can achieve a larger phase change strain, and the latent heat released during its phase change process is greater, improving the refrigeration efficiency of the refrigeration system. By arranging two symmetrical elastic rubbers in the fluid pipeline of the SMA bed, the control of the system flow rate can be realized, and the fluid can fully convectively exchange heat with the SMA bed, improving the heat transfer efficiency of the refrigeration system. Through the heat transfer fluid, the transfer of cold energy is realized. The refrigeration device uses two groups of elastocaloric SMA at the same time to alternately dissipate the cold energy and heat energy of the system, improving the working efficiency of the refrigeration device.

[0006] In order to achieve the above object, the present utility model adopts the following technical solutions to implement:

[0007] A heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration device based on a topological configuration elastic microchannel includes an SMA bed displacement sliding device 31. The first elastocaloric SMA bed 28 and the second elastocaloric SMA bed 30 are symmetrically arranged on both sides of the SMA bed displacement sliding device 31. The SMA bed displacement sliding device 31 is slidably connected to the positioning member 1. The top parts of both ends of the positioning member 1 are respectively symmetrically provided with driving SMA bed end fixing devices 32. Between one driving SMA bed end fixing device 32 and the SMA bed displacement sliding device 31 and on both sides of the first elastocaloric SMA bed 28, the first driving SMA bed 27 is symmetrically arranged. Between the other driving SMA bed end fixing device 32 and the SMA bed displacement sliding device 31 and on both sides of the second elastocaloric SMA bed 30, the second driving SMA bed 29 is symmetrically arranged. The top of the positioning member 1 is respectively symmetrically provided with elastocaloric SMA bed end fixing devices 33 located between the SMA bed displacement sliding device 31 and the driving SMA bed end fixing devices 32. The elastocaloric SMA bed end fixing devices 33 on both sides are respectively fixedly connected to the first elastocaloric SMA bed 28 and the second elastocaloric SMA bed 30. The first elastocaloric SMA bed 28, the second elastocaloric SMA bed 30, the first driving SMA bed 27 and the second driving SMA bed 29 are all SMA beds with the same structure. The SMA bed includes a fluid pipeline 34, and several nickel-titanium alloy sheets 37 are arranged at the middle position inside the fluid pipeline 34. Two elastic rubbers 35 are symmetrically arranged inside the fluid pipeline 34, and a flow channel 38 is arranged on the plane of each elastic rubber 35 close to the nickel-titanium alloy sheet 37.

[0008] The flow channel 38 is a rhombic flow channel, a flat hexagonal flow channel or an equilateral hexagonal honeycomb column flow channel; at the inlet of the rhombic flow channel, it branches into three-level rhombic branch flow channels and converges into the outlet of the rhombic flow channel at the same time; at the inlet of the flat hexagonal flow channel, it branches into three-level flat hexagonal branch flow channels and converges into the outlet of the flat hexagonal flow channel at the same time; at the inlet of the equilateral hexagonal honeycomb column flow channel, it branches into branch flow channels around several convex equilateral hexagonal honeycomb columns and converges into the outlet of the equilateral hexagonal honeycomb column flow channel at the same time.

[0009] The first elastocaloric SMA bed 28 and the second elastocaloric SMA bed 30 have the same length, the first driving SMA bed 27 and the second driving SMA bed 29 have the same length, and the length ratio of the elastocaloric SMA bed to the driving SMA bed is 1:2.

[0010] The elastocaloric SMA bed end fixing device 33 includes an SMA fixed end lower cover plate 3 connected to the top of the positioning member 1; a groove 39 is machined on the top surface in the middle of the SMA fixed end lower cover plate 3, an SMA fastener 4 matching the size of the groove 39 is arranged in the groove 39, and an SMA fixed end upper cover plate 5 is arranged on the top of the SMA fastener 4; the SMA fixed end lower cover plate 3, the SMA fixed end upper cover plate 5 are fixedly connected to the positioning member 1; the two side SMA fasteners 4 are respectively fixedly connected to the first elastocaloric SMA bed 28 and the second elastocaloric SMA bed 30.

[0011] The driving SMA bed end fixing device 32 includes an SMA fixed end lower cover plate 3 connected to the top of the positioning member 1; two grooves 39 are respectively machined on the top surfaces on both sides of the SMA fixed end lower cover plate 3, an SMA fastener 4 matching the size of the groove 39 is arranged in each groove 39, and an SMA fixed end upper cover plate 5 is arranged on the top of the SMA fastener 4; the SMA fixed end lower cover plate 3, the SMA fixed end upper cover plate 5 are fixedly connected to the positioning member 1; the two side SMA fasteners 4 are respectively fixedly connected to the first driving SMA bed 27 and the second driving SMA bed 29.

[0012] The SMA bed displacement sliding device 31 includes an SMA sliding device fixing member 11, three SMA bed fixing blocks 10 are respectively arranged on the two vertical sides of the SMA sliding device fixing member 11; SMA sliding device fixing grooves 36 are arranged on both horizontal sides of the SMA sliding device fixing member 11, the SMA sliding device fixing grooves 36 are fixedly connected to the convex blocks of the sliding device connecting member 6, the sliding device connecting member 6 is fixedly connected to the slider 7, the slider 7 is slidably connected to the sliding guide rail 8, the sliding guide rail 8 is fixedly connected to the sliding guide rail fixing block 9, and the sliding guide rail fixing block 9 is fixedly connected to the positioning member 1.

[0013] The present invention also provides an application of the above device in a heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration system based on a topological configuration elastic microchannel.

[0014] A heat exchange enhanced thermal-power coupled elastic-caloric refrigeration system based on a topologically configured elastic microchannel, comprising:

[0015] Driving module: including a heat exchange enhanced thermal-work coupled elasto-caloric cooling device based on a topologically configured elastic microfluidic channel. The driving SMA bed of the heat exchange enhanced thermal-work coupled elasto-caloric cooling device undergoes a phase change under high temperature conditions, generating a driving force, providing a phase change stress field for the elasto-caloric SMA bed of the heat exchange enhanced thermal-work coupled elasto-caloric cooling device. The elasto-caloric SMA bed generates an elasto-caloric effect under the phase change stress field provided by the driving SMA bed.

[0016] Heat exchange module: includes a high-temperature heat exchanger 25, a low-temperature heat exchanger 23, a first normal-temperature heat exchanger 24, and a second normal-temperature heat exchanger 26; the high-temperature heat exchanger 25 is used to provide high-temperature fluid for the drive module's SMA bed; the low-temperature heat exchanger 23 is used to collect the low-temperature fluid output by the elastic-calorific SMA bed; the first normal-temperature heat exchanger 24 and the second normal-temperature heat exchanger 26 are used to release the heat generated by the elastic-calorific SMA bed to the environment;

[0017] Refrigeration heat-work conversion module: includes a refrigeration circuit and a heat-work conversion circuit. The elastic heat SMA bed, the low-temperature heat exchanger 23 and the first normal-temperature heat exchanger 24 form a refrigeration circuit; the driving SMA bed, the high-temperature heat exchanger 25 and the second normal-temperature heat exchanger 26 form a heat-work conversion circuit.

[0018] Compared with the prior art, the present invention has the following technical effects:

[0019] 1. The utility model realizes refrigeration by adopting two sets of elastic thermal SMA beds, which can realize continuous output of cooling capacity of the refrigeration device. By setting the length ratio of the elastic thermal SMA and the driving SMA to 1:2, the working efficiency of the system is improved. The driving is carried out by two sets of driving SMA beds, which is pollution-free to the environment and meets the requirements of sustainable development. When the length of the driving SMA remains unchanged and the length of the elastic thermal SMA is shortened by half, when the same driving force is obtained, the displacement of the SMA bed displacement sliding device is constant, the elastic thermal SMA bed can achieve a larger phase change strain, and the latent heat released during the phase change process is greater, thereby improving the refrigeration efficiency of the system.

[0020] 2. The utility model realizes the control of the system flow by arranging two symmetrical elastic rubbers in the fluid pipeline of the SMA bed, and enables the fluid to fully carry out convective heat exchange with the SMA bed; and flow channels of different shapes are arranged on the plane of the elastic rubber. Through the flow channels of different shapes, the heat exchange area of the fluid is increased, thereby improving the heat exchange efficiency of the refrigeration system.

[0021] In summary, the utility model induces the elastocaloric effect of the elastocaloric shape memory alloy (SMA) by setting the thermal energy to drive the phase change of the SMA. The length ratio of the elastocaloric SMA to the driving SMA is set to 1:2, and the elastocaloric SMA bed can achieve a larger phase change strain, and the latent heat released during its phase change process is greater. By setting two symmetric elastic rubbers in the fluid pipeline of the SMA bed, the control of the system flow rate can be realized, and the fluid can fully convect and exchange heat with the SMA bed. The transfer of cold energy is achieved through the heat transfer fluid, and the refrigeration device uses two groups of elastocaloric SMA beds at the same time to alternately dissipate the cold energy and thermal energy of the system, which can stably and efficiently perform periodic cyclic work and improve the working efficiency of the refrigeration system. Brief Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the heat transfer enhanced thermomechanical coupling elastocaloric refrigeration device based on the topological configuration elastic microchannel of the utility model.

[0023] Figure 2 It is a schematic structural diagram of the end fixing device of the elastocaloric SMA bed of the utility model.

[0024] Figure 3 It is a schematic structural diagram of the SMA bed displacement sliding device of the utility model.

[0025] Figure 4 It is a schematic structural diagram of the SMA bed of the utility model, wherein, Figure 4 (a) is a cross-sectional view, Figure 4 (b) is a schematic structural diagram of the diamond-shaped flow channel on the surface of the elastic rubber.

[0026] Figure 5 It is a schematic structural diagram of the SMA bed of the utility model, wherein, Figure 5 (a) is a cross-sectional view, Figure 5 (b) is a schematic structural diagram of the flat hexagonal flow channel on the surface of the elastic rubber.

[0027] Figure 6 It is a schematic structural diagram of the SMA bed of the utility model, wherein, Figure 6 (a) is a cross-sectional view, Figure 6 (b) is a schematic structural diagram of the equilateral hexagonal honeycomb column flow channel on the surface of the elastic rubber.

[0028] Figure 7 It is a schematic diagram of the fluid circuit principle of the first half cycle of the elastocaloric refrigeration system of the utility model.

[0029] Figure 8 It is a schematic diagram of the fluid circuit principle of the second half cycle of the elastocaloric refrigeration system of the utility model.

[0030] In the figure: 1. Positioning member; 2. Fixed gasket; 3. Lower cover plate of SMA fixed end; 4. SMA fastener; 5. Upper cover plate of SMA fixed end; 6. Connecting member of sliding device; 7. Slide block; 8. Slide rail; 9. Fixed block of slide rail; 10. Fixed block of SMA bed; 11. Fixed member of SMA sliding device; 12. First fluid pump; 13. Second fluid pump; 14. Third fluid pump; 15. First reversing valve; 16. Second reversing valve; 17. Third reversing valve; 18. Fourth reversing valve; 19. Fifth reversing valve; 20. Sixth reversing valve; 21. Seventh reversing valve; 22. Eighth reversing valve; 23. Low-temperature heat exchanger; 24. First normal-temperature heat exchanger; 25. High-temperature heat exchanger; 26. Second normal-temperature heat exchanger; 27. First driving SMA bed; 28. First elastocaloric SMA bed; 29. Second driving SMA bed; 30. Second elastocaloric SMA bed; 31. SMA bed displacement sliding device; 32. End fixing device of driving SMA bed; 33. End fixing device of elastocaloric SMA bed; 34. Fluid pipeline; 35. Elastic rubber; 36. Fixed groove of SMA sliding device; 37. Nitinol sheet; 38. Flow channel; 39. Groove. Detailed implementation mode

[0031] The following further elaborates on the specific content of the present utility model in conjunction with the attached drawings.

[0032] As Figure 1 shown, a heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration device based on a topological configuration elastic microchannel includes an SMA bed displacement sliding device 31. On both sides of the SMA bed displacement sliding device 31, a first elastocaloric SMA bed 28 and a second elastocaloric SMA bed 30 are symmetrically arranged; the SMA bed displacement sliding device 31 is slidably connected to the positioning member 1. At the top of both ends of the positioning member 1, end fixing devices 32 of the driving SMA bed are symmetrically arranged respectively. Between one side of the end fixing device 32 of the driving SMA bed and the SMA bed displacement sliding device 31 and on both sides of the first elastocaloric SMA bed 28, first driving SMA beds 27 are symmetrically arranged. Between the end fixing device 32 of the driving SMA bed on the other side and the SMA bed displacement sliding device 31 and on both sides of the second elastocaloric SMA bed 30, second driving SMA beds 29 are symmetrically arranged; at the top of the positioning member 1, elastocaloric SMA bed end fixing devices 33 located between the SMA bed displacement sliding device 31 and the end fixing device 32 of the driving SMA bed are symmetrically arranged respectively. The elastocaloric SMA bed end fixing devices 33 on both sides are fixedly connected to the first elastocaloric SMA bed 28 and the second elastocaloric SMA bed 30 respectively; the lengths of the first elastocaloric SMA bed 28 and the second elastocaloric SMA bed 30 are equal, the lengths of the first driving SMA bed 27 and the second driving SMA bed 29 are equal, and the lengths of the first elastocaloric SMA bed 28 and the second elastocaloric SMA bed 30 are half of the lengths of the first driving SMA bed 27 and the second driving SMA bed 29.

[0033] As shown Figure 2 in FIG. 1, the end fixing device 33 of the elastocaloric SMA bed includes an SMA fixed-end lower cover plate 3 connected to the top of the positioning member 1, and a fixing gasket 2 is arranged between the SMA fixed-end lower cover plate 3 and the positioning member 1; a groove 39 is machined on the top surface in the middle of the SMA fixed-end lower cover plate 3, and an SMA fastener 4 matching the size of the groove 39 is arranged in the groove 39, and an SMA fixed-end upper cover plate 5 is arranged on the top of the SMA fastener 4; the SMA fixed-end lower cover plate 3, the SMA fixed-end upper cover plate 5 and the positioning member 1 are fixedly connected by bolts; the SMA fasteners 4 of the end fixing devices 33 of the elastocaloric SMA beds on both sides are respectively fixedly connected to the first elastocaloric SMA bed 28 and the second elastocaloric SMA bed 30.

[0034] The end fixing device 32 of the driving SMA bed includes an SMA fixed-end lower cover plate 3 connected to the top of the positioning member 1, and a fixing gasket 2 is arranged between the SMA fixed-end lower cover plate 3 and the positioning member 1; two grooves 39 are respectively machined on the top surfaces on both sides of the SMA fixed-end lower cover plate 3, and an SMA fastener 4 matching the size of the groove 39 is arranged in each groove 39, and an SMA fixed-end upper cover plate 5 is arranged on the top of the SMA fastener 4; the SMA fixed-end lower cover plate 3, the SMA fixed-end upper cover plate 5 and the positioning member 1 are fixedly connected by bolts; the SMA fasteners 4 of the end fixing devices 33 of the driving SMA alloy sheets on both sides are respectively fixedly connected to the first driving SMA bed 27 and the second driving SMA bed 29.

[0035] As shown Figure 3 in FIG. 2, the displacement sliding device 31 of the SMA bed includes an SMA sliding device fixing member 11, and three SMA bed fixing blocks 10 are respectively arranged on the vertical two sides of the SMA sliding device fixing member 11 for fixing the driving SMA bed and the elastocaloric SMA bed; further, a plurality of threaded holes are arranged on the SMA sliding device fixing member 11, and the SMA alloy sheets in the driving SMA bed and the elastocaloric SMA bed are fixed to the SMA sliding device fixing member 11 through the SMA alloy sheet fixing blocks 10 and bolts; SMA sliding device fixing grooves 36 are arranged on both horizontal sides of the SMA sliding device fixing member 11, and the SMA sliding device fixing grooves 36 are fixedly connected to the convex blocks of the sliding device connecting member 6, the sliding device connecting member 6 is fixedly connected to the slider 7, the slider 7 is slidably connected to the sliding guide rail 8, the sliding guide rail 8 is fixedly connected to the sliding guide rail fixing block 9, and the sliding guide rail fixing block 9 is fixedly connected to the positioning member 1;

[0036] The first elastic SMA bed 28, the second elastic SMA bed 30, the first driving SMA bed 27 and the second driving SMA bed 29 are all SMA beds with the same structure. The SMA bed includes a fluid pipeline 34. At the middle position inside the fluid pipeline 34, a number of nickel-titanium alloy sheets 37 are arranged. When the heat transfer fluid flows through the nickel-titanium alloy sheets, it absorbs energy and conducts the transfer. On the inner pipe wall of the fluid pipeline 34, two elastic rubbers 35 are symmetrically arranged. On the plane of each elastic rubber 35 close to the nickel-titanium alloy sheet 37, a flow channel 38 for increasing the convective heat transfer area is arranged. By changing the shape of the flow channel 38, the boundary layer of the fluid flow can be destroyed, thereby forming a secondary flow, increasing the convective heat transfer area, enabling the fluid to absorb more cold energy, improving the heat transfer efficiency, and enhancing the performance of the refrigeration system.

[0037] The flow channel 38 is a diamond-shaped flow channel, a flat hexagonal flow channel or an equilateral hexagonal honeycomb column flow channel; as Figure 4 shown, at the entrance of the diamond-shaped flow channel, the flow divides to form a three-stage diamond-shaped branch flow channel, and simultaneously converges at the exit of the diamond-shaped flow channel; as Figure 5 shown, at the entrance of the flat hexagonal flow channel, the flow divides to form a three-stage flat hexagonal branch flow channel, and simultaneously converges at the exit of the flat hexagonal flow channel; as Figure 6 shown, at the entrance of the equilateral hexagonal honeycomb column flow channel, the flow divides to form branch flow channels around a number of outwardly convex equilateral hexagonal honeycomb columns, and simultaneously converges at the exit of the equilateral hexagonal honeycomb column flow channel; compared with the flat flow channel, the convective heat transfer area of the diamond-shaped flow channel, the flat hexagonal flow channel or the equilateral hexagonal honeycomb-shaped flow channel is significantly increased, and the heat transfer efficiency of the refrigeration system can be improved.

[0038] The above heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration device based on the topological configuration elastic microchannel is applied to a heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration system based on the topological configuration elastic microchannel; the heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration system based on the topological configuration elastic microchannel includes:

[0039] A driving module: including a heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration device based on the topological configuration elastic microchannel. The driving SMA bed of the heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration device undergoes a phase change under high temperature conditions, generating a driving force to provide a phase change stress field for the elastocaloric SMA bed of the heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration device. The elastocaloric SMA bed generates an elastocaloric effect under the phase change stress field provided by the driving SMA bed.

[0040] A heat transfer module: including a high-temperature heat exchanger 25, a low-temperature heat exchanger 23, a first normal-temperature heat exchanger 24 and a second normal-temperature heat exchanger 26; the high-temperature heat exchanger 25 is used to provide high-temperature fluid for the driving SMA bed of the driving module; the low-temperature heat exchanger 23 is used to collect the low-temperature fluid output by the elastocaloric SMA bed; the first normal-temperature heat exchanger 24 and the second normal-temperature heat exchanger 26 are used to release the heat generated by the elastocaloric SMA bed to the environment.

[0041] Refrigeration and thermomechanical conversion module: It includes a refrigeration circuit and a thermomechanical conversion circuit. The elastocaloric SMA bed, the low-temperature heat exchanger 23, and the first normal-temperature heat exchanger 24 form the refrigeration circuit; the driving SMA bed, the high-temperature heat exchanger 25, and the second normal-temperature heat exchanger 26 form the thermomechanical conversion circuit.

[0042] The working principle of a thermomechanical coupling elastocaloric refrigeration system based on the elastocaloric effect of the present utility model is as follows:

[0043] In the initial state, an initial stress is applied to the first driving SMA bed 27 and the first elastocaloric SMA bed 28, causing them to undergo a phase change and generate corresponding initial strains; the second driving SMA bed 29 and the second elastocaloric SMA bed 30 are placed in the heat transfer enhanced thermomechanical coupling elastocaloric refrigeration device in a zero-stress state; the first driving SMA bed 27 is in the martensite phase, the second driving SMA bed 29 is in the austenite phase, and the first elastocaloric SMA bed 28 and the second elastocaloric SMA bed 30 are in the austenite phase in the stress-free state;

[0044] The first half cycle: As Figure 7 shown, the second fluid pump 13 is turned on, and the high-temperature fluid in the high-temperature heat exchanger 25 flows into the first driving SMA bed 27 through the fifth reversing valve 19. The high-temperature fluid conducts convective heat transfer with the first driving SMA bed 27. The first driving SMA bed 27 absorbs heat and its temperature rises. After undergoing a phase change, it contracts. When the first driving SMA bed 27 contracts, it drives the SMA bed displacement sliding device 31 to slide to the left. During the sliding process of the SMA bed displacement sliding device 31, the first elastocaloric SMA bed 28 is unloaded and the second elastocaloric SMA bed 30 is loaded. At the same time, the second driving SMA bed 29 is stretched by the traction of the SMA bed displacement sliding device 31; the medium-low temperature fluid generated after the convective heat transfer of the first driving SMA bed 27 enters the high-temperature heat exchanger 25 through the sixth reversing valve 20 to be heated to continue generating high-temperature fluid; at the same time, the third fluid pump 14 is turned on, and the normal-temperature fluid in the second normal-temperature heat exchanger 26 flows through the seventh reversing valve 21 into the second driving SMA bed 29 for convective heat transfer to generate medium-low temperature fluid. The medium-low temperature fluid flows back to the second normal-temperature heat exchanger 26 through the eighth reversing valve 22 to absorb heat and generate normal-temperature fluid; subsequently, the first fluid pump 12 is turned on, and the normal-temperature fluid in the first normal-temperature heat exchanger 24 enters the second elastocaloric SMA bed 30 through the second reversing valve 16 to carry cold and generate low-temperature fluid. The low-temperature fluid flows into the low-temperature heat exchanger 23 for heat transfer to generate normal-temperature fluid. The normal-temperature fluid enters the second elastocaloric SMA bed 30 through the first reversing valve 15 to exhaust heat and generate medium-low temperature fluid. The medium-low temperature fluid flows into the first normal-temperature heat exchanger 24 through the fourth reversing valve 18 for heat dissipation to generate normal-temperature fluid.

[0045] The second half cycle: As Figure 8As shown, after the convective heat transfer ends, switch the valve switches of the fifth reversing valve 19, the sixth reversing valve 20, the seventh reversing valve 21, and the eighth reversing valve 22, turn on the second fluid pump 13 and the third fluid pump 14. The high-temperature fluid enters the second driving SMA bed 29 through the fifth reversing valve 19. The high-temperature fluid heats the second driving SMA bed 29 to cause a phase change and generate a driving force. The contraction process of the second driving SMA bed 29 drives the SMA bed displacement sliding device 31 to slide to the right. During the sliding process, the second elastocaloric SMA bed 30 is unloaded by the SMA bed displacement sliding device 31, and the first elastocaloric SMA bed 28 is loaded. The first driving SMA bed 27 is stretched again under traction; switch the valve switches of the first reversing valve 15, the second reversing valve 16, the third reversing valve 17, and the fourth reversing valve 18, turn on the first fluid pump 12. The normal-temperature fluid in the first normal-temperature heat exchanger 24 flows through the second elastocaloric SMA bed 30 to carry out cold load on it to generate low-temperature fluid. The low-temperature fluid enters the low-temperature heat exchanger 23 for heat exchange to generate normal-temperature fluid. The normal-temperature fluid enters the first elastocaloric SMA bed 28 for heat rejection to generate medium-low temperature fluid. The medium-low temperature fluid enters the first normal-temperature heat exchanger 24 for heat dissipation to generate normal-temperature fluid.

[0046] In this way, the thermo-mechanical coupling elastocaloric refrigeration device based on the elastocaloric effect of the present utility model can achieve continuous output of cold energy by two groups of elastocaloric SMAs, and the periodic operation of the refrigeration system can be realized by switching the fluid pumps and reversing valves.

Claims

1. A heat transfer enhanced thermo-mechanical elastocaloric refrigeration device based on a topological configuration elastic microchannel, comprising an SMA bed displacement sliding device (31), with a first elastocaloric SMA bed (28) and a second elastocaloric SMA bed (30) symmetrically arranged on both sides of the SMA bed displacement sliding device (31); the SMA bed displacement sliding device (31) is slidably connected to a positioning member (1), and at the top of both ends of the positioning member (1), driving SMA bed end fixing devices (32) are symmetrically arranged respectively. Between one side of the driving SMA bed end fixing device (32) and the SMA bed displacement sliding device (31) and on both sides of the first elastocaloric SMA bed (28), first driving SMA beds (27) are symmetrically arranged. Between the driving SMA bed end fixing device (32) on the other side and the SMA bed displacement sliding device (31) and on both sides of the second elastocaloric SMA bed (30), second driving SMA beds (29) are symmetrically arranged; at the top of the positioning member (1), elastocaloric SMA bed end fixing devices (33) located between the SMA bed displacement sliding device (31) and the driving SMA bed end fixing devices (32) are symmetrically arranged respectively, and the elastocaloric SMA bed end fixing devices (33) on both sides are fixedly connected to the first elastocaloric SMA bed (28) and the second elastocaloric SMA bed (30) respectively. It is characterized in that: The first elastic-heat SMA bed (28), the second elastic-heat SMA bed (30), the first driving SMA bed (27) and the second driving SMA bed (29) are all SMA beds with the same structure. The SMA bed includes a fluid pipeline (34), and several nickel-titanium alloy sheets (37) are arranged at the middle position inside the fluid pipeline (34); two elastic rubbers (35) are symmetrically arranged inside the fluid pipeline (34), and a flow channel (38) is arranged on the plane of each elastic rubber (35) close to the nickel-titanium alloy sheet (37).

2. The heat transfer enhanced thermo-mechanical elastocaloric refrigeration device based on a topological configuration elastic microchannel according to claim 1, wherein: The flow channel (38) is a diamond-shaped flow channel, a flat hexagonal flow channel or an equilateral hexagonal honeycomb column flow channel; at the entrance of the diamond-shaped flow channel, it branches into three-level diamond-shaped branch flow channels and converges into the exit of the diamond-shaped flow channel at the same time; at the entrance of the flat hexagonal flow channel, it branches into three-level flat hexagonal branch flow channels and converges into the exit of the flat hexagonal flow channel at the same time; at the entrance of the equilateral hexagonal honeycomb column flow channel, it branches into branch flow channels around several outwardly convex equilateral hexagonal honeycomb columns and converges into the exit of the equilateral hexagonal honeycomb column flow channel at the same time.

3. The heat transfer enhanced thermo-mechanical elastocaloric refrigeration device based on a topological configuration elastic microchannel according to claim 1 or 2, characterized in that: The first elastic-heat SMA bed (28) and the second elastic-heat SMA bed (30) have the same length, the first driving SMA bed (27) and the second driving SMA bed (29) have the same length, and the length ratio of the elastic-heat SMA bed to the driving SMA bed is 1:

2.

4. The heat transfer enhanced thermo-mechanical elastocaloric refrigeration device based on a topological configuration elastic microchannel according to claim 1, wherein: The elastic-heat SMA bed end fixing device (33) includes an SMA fixed-end lower cover plate (3) connected to the top of the positioning member (1); a groove (39) is machined on the top surface in the middle of the SMA fixed-end lower cover plate (3), and an SMA fastener (4) matching the size of the groove (39) is arranged in the groove (39), and an SMA fixed-end upper cover plate (5) is arranged on the top of the SMA fastener (4); the SMA fixed-end lower cover plate (3), the SMA fixed-end upper cover plate (5) and the positioning member (1) are fixedly connected; the two side SMA fasteners (4) are respectively fixedly connected to the first elastic-heat SMA bed (28) and the second elastic-heat SMA bed (30).

5. The heat transfer enhanced thermo-mechanical elastocaloric refrigeration device based on a topological configuration elastic microchannel according to claim 1, characterized in that: The driving SMA bed end fixing device (32) includes an SMA fixed-end lower cover plate (3) connected to the top of the positioning member (1); two grooves (39) are respectively machined on the top surfaces on both sides of the SMA fixed-end lower cover plate (3), and an SMA fastener (4) matching the size of the groove (39) is arranged in each groove (39), and an SMA fixed-end upper cover plate (5) is arranged on the top of the SMA fastener (4); the SMA fixed-end lower cover plate (3), the SMA fixed-end upper cover plate (5) and the positioning member (1) are fixedly connected; the two side SMA fasteners (4) are respectively fixedly connected to the first driving SMA bed (27) and the second driving SMA bed (29).

6. The heat transfer enhanced thermo-mechanical elastocaloric refrigeration device based on a topological configuration elastic microchannel according to claim 1, characterized in that: The SMA bed displacement sliding device (31) includes an SMA sliding device fixing member (11). Three SMA bed fixing blocks (10) are respectively arranged on the vertical two sides of the SMA sliding device fixing member (11). SMA sliding device fixing grooves (36) are arranged on the horizontal two sides of the SMA sliding device fixing member (11). The SMA sliding device fixing grooves (36) are fixedly connected with the convex blocks of the sliding device connecting member (6). The sliding device connecting member (6) is fixedly connected with the slider (7). The slider (7) is slidably connected with the sliding guide rail (8). The sliding guide rail (8) is fixedly connected with the sliding guide rail fixing block (9). The sliding guide rail fixing block (9) is fixedly connected with the positioning member (1).

7. Application of a heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration device based on a topological configuration elastic microchannel in a heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration system according to any one of claims 1-6.

8. The heat transfer enhanced thermo-mechanical elastocaloric refrigeration system based on a topologically configured elastic microchannel according to claim 7, wherein, Comprising: Drive module: It includes a heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration device. The drive SMA bed of the heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration device undergoes a phase change under high-temperature conditions to generate a driving force, providing a phase change stress field for the elastocaloric SMA bed of the heat transfer enhanced thermo-mechanical coupling elastocaloric refrigeration device. The elastocaloric SMA bed generates an elastocaloric effect under the phase change stress field provided by the drive SMA bed. Heat transfer module: It includes a high-temperature heat exchanger (25), a low-temperature heat exchanger (23), a first normal-temperature heat exchanger (24), and a second normal-temperature heat exchanger (26). The high-temperature heat exchanger (25) is used to provide high-temperature fluid for the drive SMA bed of the drive module. The low-temperature heat exchanger (23) is used to collect the low-temperature fluid output by the elastocaloric SMA bed. The first normal-temperature heat exchanger (24) and the second normal-temperature heat exchanger (26) are used to release the heat generated by the elastocaloric SMA bed to the environment. Refrigeration thermo-mechanical conversion module: It includes a refrigeration circuit and a thermo-mechanical conversion circuit. The elastocaloric SMA bed, the low-temperature heat exchanger (23), and the first normal-temperature heat exchanger (24) form a refrigeration circuit. The drive SMA bed, the high-temperature heat exchanger (25), and the second normal-temperature heat exchanger (26) form a thermo-mechanical conversion circuit.

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