Torsional heat refrigeration device with power recovery by planetary gears and method of refrigeration

Abstract

This invention discloses a work-recovery torsional heat-cooling device and its cooling method driven by planetary gears, belonging to the field of solid-state refrigeration. The device includes a planetary gear train, a first planetary carrier, a second planetary carrier, multiple clamps, and a heat exchange unit. The planetary gear train includes an internal gear sleeve and a sun gear arranged opposite each other. The first set of planetary gears meshes with the sun gear, and the second set of planetary gears meshes with the internal gear sleeve. The second planetary carrier is connected to a drive motor and drives the first planetary carrier to rotate synchronously via a transmission shaft. Two sets of planetary gears with clamps are respectively mounted on the first and second planetary carriers, with the clamp centerlines coinciding. The heat source and heat sink are arranged on the planetary gear revolution trajectory, and the heat exchange surface is tangent to the trajectory. When driven by the motor, the two sets of planetary gears generate opposite rotations, twisting or untwisting the shape memory alloy wire. This invention can effectively recover the mechanical work released during the untwisting of the shape memory alloy, increasing cooling capacity while reducing energy consumption and improving energy efficiency.

Description

Technical Field

[0001] This invention belongs to the field of solid-state refrigeration, specifically relating to a work-recovery torsional heat refrigeration device and its refrigeration method driven by planetary gears. Background Technology

[0002] Refrigeration technology plays a vital role in production and daily life, but traditional vapor compression refrigeration requires the use of gaseous-liquid refrigerants that contribute to the greenhouse effect. To address environmental challenges, solid-state refrigeration, based on the solid-state phase change effect, has become a research hotspot as a next-generation refrigeration technology. Solid-state refrigeration achieves cooling by alternating absorption and release of latent heat from solid-solid phase changes within shape memory alloys under stress field drive, offering advantages such as high energy efficiency and refrigerant-free operation. Among these technologies, torsional refrigeration utilizes the reversible martensitic phase change latent heat within the shape memory alloy to achieve heat pumping by driving the alloy to twist. Compared to other solid-state refrigeration technologies, torsional refrigeration requires less driving force, has higher Carnot efficiency, and is smaller in size. Currently, to increase cooling capacity, the common approach in this field is to increase the number or size of shape memory alloys.

[0003] However, in existing twisting-heat refrigeration devices, when increasing the number of shape memory alloys to improve cooling capacity, the drive mechanism needs to increase its input work exponentially to overcome the resistance torque generated during the twisting of multiple alloy wires. This leads to a significant increase in the total system energy consumption and a decrease in the coefficient of performance (COP). Specifically, most of the driving work is dissipated as mechanical energy during the alloy untwisting stage and cannot be effectively recovered and utilized. This greatly diminishes the economic and energy efficiency advantages of twisting-heat refrigeration in high-capacity applications. How to effectively reduce the energy consumption per unit cooling capacity while increasing the cooling capacity is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to address the problems in the prior art by providing a work-recoverable torsional heat-cooling device and its cooling method driven by planetary gears. This device effectively recovers the mechanical work released during the untwisting of shape memory alloys, increases the cooling capacity of the torsional heat-cooling device, reduces driving energy consumption, and improves the system's energy efficiency ratio.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, a work-recovery torsional heat refrigeration device driven by planetary gears is provided, comprising: The planetary gear train includes an internal gear sleeve, a sun gear, and multiple sets of planetary gears. The internal gear sleeve and the sun gear are arranged opposite each other. The first set of planetary gears meshes with the internal gear sleeve, and the second set of planetary gears meshes with the sun gear. The first planetary carrier and the second planetary carrier are connected to the output end of the drive motor. The first planetary carrier is connected to the second planetary carrier through a force transmission shaft so as to rotate synchronously with the second planetary carrier. The first set of planetary gears and the second set of planetary gears are respectively mounted on the first planetary carrier and the second planetary carrier. Multiple clamps, each mounted on a planetary gear, are used to clamp shape memory alloy wires. The center lines of the clamps on the first set of planetary gears coincide with those of the clamps on the second set of planetary gears. A heat exchange unit includes a heat source and a heat sink, which are arranged on the orbital trajectory of the planetary gear, and the heat exchange surfaces of the heat source and the heat sink are tangent to the orbital trajectory. When the drive motor drives the first planetary carrier and the second planetary carrier to rotate synchronously, the first set of planetary gears rotates in the opposite direction to the planetary carrier while revolving around it, and the second set of planetary gears rotates in the same direction as the planetary carrier while revolving around it. The difference in rotation angle caused by the two rotates the shape memory alloy wires clamped on the corresponding fixtures to twist or untwist them.

[0006] As a preferred embodiment, the planetary gear is a bearing gear.

[0007] As a preferred embodiment, the installation position of the force transmission shaft does not exceed the circle containing the center line of the planetary gear, to prevent interference with the heat source or heat sink during rotation.

[0008] As a preferred solution, at the beginning of installation, only one set of planetary gears, clamps, and shape memory alloy wires are installed on the heat source side. After the shape memory alloy wires have completed twisting and revolved to the heat sink side, another set of planetary gears, clamps, and shape memory alloy wires are installed on the heat source side. This allows the other set of shape memory alloy wires to untwist while one set is twisting. The energy released by untwisting is recovered through gear transmission and used to assist in twisting.

[0009] As a preferred embodiment, the number of teeth of the inner gear sleeve, the sun gear, the first set of planetary gears, and the second set of planetary gears satisfies the following relationship: when the number of teeth of the planetary gears on both sides is equal, the number of teeth of the inner gear sleeve = the number of teeth of the sun gear + 2 × the number of teeth of the planetary gears; The maximum number of twists of shape memory alloy = (number of teeth on the planetary gear side of the inner gear sleeve ÷ number of teeth on the planetary gear side of the inner gear sleeve + number of teeth on the sun gear ÷ number of teeth on the planetary gear side of the sun gear) × angle difference between the installation positions of the heat source and heat sink / 360°.

[0010] As a preferred embodiment, multiple sets of planetary gears are installed circumferentially on the first planetary carrier and / or the second planetary carrier. Each set of planetary gears is equipped with a clamp to hold shape memory alloy wires, and the heat exchange surface shape of the heat source and heat sink is adapted to the distribution of all shape memory alloy wires on the same side.

[0011] As a preferred embodiment, the regenerative heat recovery and cooling device driven by planetary gears further includes a base plate and a support structure. The drive motor, inner gear sleeve, and sun gear are respectively fixed above the base plate by the support structure. The base plate has multiple mounting holes at different positions. By changing the mounting position of the support structure, the mounting position of the inner gear sleeve and / or the sun gear can be adjusted to accommodate shape memory alloy wires of different lengths.

[0012] As a preferred embodiment, the heat source and heat sink are mounted via a heat source and heat sink fixing plate and can be tightly fitted with shape memory alloy wire to achieve solid-solid heat exchange; or, a fan is mounted on the heat source and heat sink fixing plate to perform heat exchange through forced convection.

[0013] As a preferred embodiment, each set of clamps holds at least two shape memory alloy wires, and the multiple shape memory alloy wires are twisted to form a spiral structure so that the twisted multiple shape memory alloy wires are on the same axis.

[0014] Secondly, a refrigeration method based on the aforementioned work recovery torsional heat refrigeration device driven by planetary gears is provided, comprising the following steps: Start the drive motor to drive the first planetary carrier and the second planetary carrier to rotate synchronously, which in turn causes the shape memory alloy wires on the first set of planetary gears to twist during the revolution, and at the same time causes the shape memory alloy wires on the second set of planetary gears to untwist during the revolution. When the twisted shape memory alloy wire revolves with the planetary gears and comes into contact with the heat sink, the drive motor is stopped, allowing the twisted shape memory alloy wire to release heat through the heat sink; The drive motor is reversed, driving the first planetary carrier and the second planetary carrier to rotate in the opposite direction, so that the twisted shape memory alloy wire is untwisted. When the corresponding shape memory alloy wire revolves with the planetary gears and comes into contact with the heat source, the drive motor is stopped, so that the shape memory alloy wire absorbs heat from the heat source. Repeat the above steps to achieve continuous cooling of the heat source.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: This invention transforms the single input rotation of the drive motor into efficient twisting and untwisting of multiple sets of shape memory alloy wires. Through periodic contact with the heat exchange surfaces of the heat source and heat sink, continuous cooling of the heat source is achieved. By setting up a double planetary carrier and a force transmission shaft, the invention achieves synchronous revolution of the planetary gears on both sides. Combined with a structure where the internal gear sleeve is fixed to the sun gear, the planetary gears on both sides rotate in opposite directions, with one end twisting while the other untwises. This invention enables the mechanical energy released by the shape memory alloy wires during the untwisting process to be directly transferred to the alloy wires being twisted through a gear transmission system, thereby achieving internal energy circulation and reuse, significantly reducing the total output power requirement of the external drive motor. When the number of shape memory alloy wires increases exponentially, the required driving force increases less than the number of shape memory alloy wires. Therefore, this invention significantly increases the cooling capacity per unit mass while maintaining or even improving the system's coefficient of performance (COP). It has significant advantages such as small size, low energy consumption, and zero greenhouse gas emissions, providing an efficient and feasible solution for the commercial application of solid-state refrigeration technology.

[0016] Furthermore, those skilled in the art will understand that the device of the present invention can also be used as a heat pump device. When heating is required, a cooling fan is simply installed on the "heat source" side (i.e., the side in contact with the shape memory alloy that absorbs heat during untwisting) to dissipate the heat from that side to the space to be heated; while the "heat sink" side (i.e., the side in contact with the shape memory alloy that releases heat during twisting) becomes the usage side, outputting heat to the outside or the target space. This mode switching does not require changing the main mechanical structure of the device; it can be achieved simply by adjusting the flow direction of the external air duct or the heat exchange medium. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A top view of the functional recovery torsion heat refrigeration device driven by planetary gears according to an embodiment of the present invention. Figure 2 A schematic diagram of the work recovery torsion heat refrigeration device driven by planetary gears in an embodiment of the present invention, viewed from a 45° top angle. Figure 3 A schematic diagram of the sun gear side structure of a work-recovery torsion heat refrigeration device driven by planetary gears according to an embodiment of the present invention; Figure 4 A schematic diagram of the inner gear sleeve side structure of a work recovery torsion heat refrigeration device driven by planetary gears according to an embodiment of the present invention. Figure 5 A schematic diagram of the motor input angle of a work recovery torsion heat refrigeration device driven by planetary gears according to an embodiment of the present invention; Figure 6 A schematic diagram of the heat exchange structure of a workable regenerative torsional heat refrigeration device driven by planetary gears according to an embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, those skilled in the art can obtain other embodiments without creative effort.

[0020] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Please see Figure 1 and Figure 2 The present invention provides a planetary gear-driven, work-recovery torsion heat refrigeration device, comprising: The planetary gear train includes an inner gear sleeve 107, a sun gear 111, and multiple sets of planetary gears. The inner gear sleeve 107 and the sun gear 111 are arranged opposite to each other. The first set of planetary gears meshes with the sun gear 111, and the second set of planetary gears meshes with the inner gear sleeve 107. The first planetary carrier 106-1 and the second planetary carrier 106-2 are connected to the output end of the drive motor 102. The first planetary carrier 106-1 is connected to the second planetary carrier 106-2 through a force transmission shaft so as to rotate synchronously with the second planetary carrier 106-2. The first set of planetary gears and the second set of planetary gears are respectively mounted on the first planetary carrier 106-1 and the second planetary carrier 106-2. Multiple clamps, each mounted on a planetary gear, are used to hold shape memory alloy wire 113. The center lines of the clamps on the first set of planetary gears coincide with those of the clamps on the second set of planetary gears. The heat exchange unit 116 includes a heat source and a heat sink, which are arranged on the orbital trajectory of the planetary gear, and the heat exchange surfaces of the heat source and the heat sink are tangent to the orbital trajectory. When the drive motor 102 drives the first planetary carrier 106-1 and the second planetary carrier 106-2 to rotate synchronously, the first set of planetary gears rotates in the opposite direction to the planetary carrier while revolving around the planet, and the second set of planetary gears rotates in the same direction as the planetary carrier while revolving around the planet. The angular difference caused by the two rotates twists or untwistresses the shape memory alloy wire 113 clamped on the corresponding fixture.

[0022] In one possible implementation, the first set of planetary gears is the sun gear-side planetary gear 110-1, and the second set of planetary gears is the internal rack-side planetary gear 110-2. (See also...) Figure 3 and Figure 4 All planetary gears use bearing gears, which can allow them to rotate freely with respect to the central shaft.

[0023] In one possible implementation, the force transmission shaft includes an upper force transmission shaft 108-1 and a lower force transmission shaft 108-2, and the installation positions of both the upper and lower force transmission shafts 108-1 and 108-2 do not exceed the circle containing the center line of the planetary gear, preventing interference with heat sources or heat sinks during rotation. Through the connection of the force transmission shafts, the second planetary carrier 106-2 located on the inner gear sleeve 107 side is the driving side, and the first planetary carrier 106-1 located on the sun gear 111 side is the driven side, further effectively avoiding interference problems during installation.

[0024] In one possible implementation, the planetary gear-driven, work-recovering, twisting-heat-cooling device of this embodiment initially installs only one set of planetary gears, clamps, and shape memory alloy wires 113 on the heat source side. After the shape memory alloy wires 113 have completed twisting and revolved to the heat sink side, another set of planetary gears, clamps, and shape memory alloy wires 113 are installed on the heat source side. This allows one set of shape memory alloy wires 113 to be twisted while the other set is untwisted. The work released by untwisting is recovered through gear transmission and used to assist in twisting, thereby reducing the total output power of the motor.

[0025] In one possible implementation, the number of teeth of the inner gear sleeve 107, the sun gear 111, the first set of planetary gears, and the second set of planetary gears satisfy the following relationship: when the number of teeth of the planetary gears on both sides is equal, the number of teeth of the inner gear sleeve = the number of teeth of the sun gear + 2 × the number of teeth of the planetary gears. If the number of teeth on the two planetary gears is not equal, the number of teeth on the inner gear sleeve 107 and the number of teeth on the planetary gears can be designed arbitrarily, but the center lines of the fixed shafts of the two planetary gears must coincide.

[0026] The maximum number of twists of shape memory alloy = (number of teeth on the planetary gear side of the inner gear sleeve ÷ number of teeth on the planetary gear side of the inner gear sleeve + number of teeth on the sun gear ÷ number of teeth on the planetary gear side of the sun gear) × angle difference between the installation positions of the heat source and heat sink / 360°.

[0027] The angle difference between the installation positions of the heat source and heat sink is generally 180°.

[0028] In one possible implementation, the clamp includes a sun gear side clamp 109-1 and an internal rack side clamp 109-2. Multiple sets of planetary gears are installed circumferentially on the first planetary carrier 106-1 and / or the second planetary carrier 106-2. Each set of planetary gears is correspondingly equipped with a clamp and holds the shape memory alloy wire 113. The heat exchange surface shape of the heat source and heat sink is adapted to the distribution of all shape memory alloy wires 113 on the same side.

[0029] In one possible implementation, the work recovery torsional cooling device driven by planetary gears further includes a base plate 101 and a support structure. The support structure includes a motor support plate 104, an inner gear sleeve support plate 114, and a sun gear support plate 112. The drive motor 102 is fixed at a certain height above the base plate 101 via the motor support plate 104 and the motor connecting plate 103. The inner gear sleeve 107 is fixed above the base plate 101 via the inner gear sleeve support plate 114, and the sun gear 111 is fixed above the base plate 101 via the sun gear support plate 112. The base plate 101 has multiple mounting holes at different positions. By changing the mounting position of the support structure, the mounting position of the inner gear sleeve 107 and / or the sun gear 111 can be adjusted to accommodate shape memory alloy wires 113 of different lengths.

[0030] In one possible implementation, the heat source and heat sink are mounted via a heat source / heat sink fixing plate 115, and can be tightly fitted with the shape memory alloy wire 113 to achieve solid-solid heat exchange; alternatively, a fan is fixed in a suitable position via the heat source / heat sink fixing plate 115, and cool air is provided to the outside through forced convection by the fan. In this embodiment, the heat sink has parallel straight fins, and the heat sink uses forced convection by a fan, or utilizes the high emissivity surface coating of the air-cooled heat exchange structure to dissipate heat through natural convection and thermal radiation.

[0031] In one possible implementation, in order to achieve near-line-surface contact in solid-solid contact, at least two shape memory alloy wires 113 are clamped on each set of clamps. A single shape memory alloy wire will undergo spatial twisting during the twisting process, and multiple shape memory alloy wires 113 will form a spiral structure after twisting, so that the multiple twisted shape memory alloy wires 113 are on the same axis.

[0032] Three or more planetary gears can be installed simultaneously on the heat source and heat sink sides without interference, increasing the number of shape memory alloys by more than three times. From a structural perspective, increasing the number of shape memory alloys increases the number of clamps in the device, increasing the possibility of motion interference and requiring excessive motor torque. Conversely, too few alloys result in insufficient cooling capacity as the heat source receives less cooling from the shape memory alloys. Therefore, the number should be appropriate, neither too many nor too few.

[0033] Please see Figure 5 The following is a brief description of the torsional heat refrigeration principle and power recovery principle of the device in the embodiment of the present invention: Since the two ends of the shape memory alloy are fixed on the two clamps, it rotates as the clamps rotate. When the internal stress of the shape memory alloy is greater than the minimum stress required for the martensitic phase transformation to occur at the corresponding temperature, the shape memory alloy material begins to transform from austenite to martensite. The entropy of the material decreases, and heat is released at the same time. It comes into contact with the heat sink and dissipates the heat into the air. Then, the drive motor rotates in the opposite direction, causing the shape memory alloy to rotate in the opposite direction. The internal stress decreases, and it recovers from the martensitic phase to the austenitic phase. The entropy increases and it absorbs heat. It comes into contact with the heat source and releases cold energy.

[0034] At the beginning of installation, only the planetary gear and shape memory alloy SMA#1 on the heat source side are installed. After the shape memory alloy is twisted, the previously installed planetary gear has rotated to the heat sink side. Then, a new planetary gear, clamp, and shape memory alloy SMA#2 are installed on the heat source side. This way, while one set of shape memory alloys is being twisted, the other set is being untwisted. The work done by untwisting can be recovered through the gears and used to load the work required for the other set of twisting, thereby reducing the total output power of the motor.

[0035] See Figure 6 The installation of the heat exchange unit 116 (including heat source and heat sink) requires adjusting the heat source and heat sink fixing plate 115 to make the heat source and heat sink fit tightly with the shape memory alloy in order to achieve better solid-solid heat exchange.

[0036] Another embodiment of the present invention provides a refrigeration method based on the aforementioned work recovery torsional heat refrigeration device driven by planetary gears, comprising the following steps: Start the drive motor 102 to drive the first planetary carrier 106-1 and the second planetary carrier 106-2 to rotate synchronously, which in turn causes the shape memory alloy wire 113 on the first set of planetary gears to twist during the revolution, and at the same time causes the shape memory alloy wire 113 on the second set of planetary gears to untwist during the revolution. When the twisted shape memory alloy wire 113 revolves with the planetary gear and comes into contact with the heat sink, the drive motor 102 is stopped, so that the twisted shape memory alloy wire 113 releases heat through the heat sink. The drive motor 102 is reversed, driving the first planetary carrier 106-1 and the second planetary carrier 106-2 to rotate in the opposite direction, so that the twisted shape memory alloy wire 113 is untwisted. When the corresponding shape memory alloy wire 113 revolves with the planetary gears and comes into contact with the heat source, the drive motor 102 is stopped, so that the shape memory alloy wire 113 absorbs heat from the heat source. Repeat the above steps to achieve continuous cooling of the heat source.

[0037] In this invention, the shape memory alloy wire rotates in different directions on the sun gear side and the internal gear sleeve side, thus twisting it. Its spatial position moves synchronously, periodically contacting the heat source and heat sink to provide cooling. The designed multiple sets of clamps can provide multiple times the cooling capacity of the device. The shape memory alloys on the heat source and heat sink sides are installed in a 180° opposite position. While one end is twisted, the other end is untwisted. This converts the work of untwisting into the work of twisting another set of shape memory alloys, thus achieving the effect that when the shape memory alloy wire is multiplied, the increase in driving force required is less than the increase in the number of shape memory alloy wires. Because multiple sets of shape memory alloys can be twisted and untwisted simultaneously with a relatively small driving force, this invention's device has significant advantages in cooling capacity per unit mass and system COP, while also possessing advantages such as small size and zero greenhouse gas emissions.

[0038] At the same time, the device can also be used as a heat pump device. Simply install a cooling fan on the heat source and change the heat sink side to the user side.

[0039] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical details; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A power recovery type turbo refrigerating apparatus driven by a planetary gear, characterized in that, include: The planetary gear train includes an inner gear sleeve (107), a sun gear (111), and multiple sets of planetary gears. The inner gear sleeve (107) and the sun gear (111) are arranged opposite to each other. The first set of planetary gears meshes with the sun gear (111), and the second set of planetary gears meshes with the inner gear sleeve (107). The first planetary carrier (106-1) and the second planetary carrier (106-2) are connected to the output end of the drive motor (102). The first planetary carrier (106-1) is connected to the second planetary carrier (106-2) through a force transmission shaft so as to rotate synchronously with the second planetary carrier (106-2). The first set of planetary gears and the second set of planetary gears are respectively mounted on the first planetary carrier (106-1) and the second planetary carrier (106-2). Multiple clamps, each clamp mounted on a planetary gear, are used to clamp shape memory alloy wire (113), and the center lines of the clamps on the first set of planetary gears coincide with the center lines of the clamps on the second set of planetary gears; The heat exchange unit (116) includes a heat source and a heat sink, which are arranged on the orbital trajectory of the planetary gear, and the heat exchange surfaces of the heat source and the heat sink are tangent to the orbital trajectory. When the drive motor (102) drives the first planetary carrier (106-1) and the second planetary carrier (106-2) to rotate synchronously, the first set of planetary gears rotates in the opposite direction to the planetary carrier while revolving around the planet, and the second set of planetary gears rotates in the same direction as the planetary carrier while revolving around the planet. The difference in rotation angle caused by the two rotates the shape memory alloy wire (113) clamped on the corresponding fixture to twist or untwist.

2. The work recovery torsion heat refrigeration device driven by planetary gears according to claim 1, characterized in that, The planetary gears are bearing gears.

3. The work recovery torsion heat refrigeration device driven by planetary gears according to claim 1, characterized in that, The installation position of the force transmission shaft does not exceed the circle containing the center line of the planetary gear, to prevent interference with the heat source or heat sink during rotation.

4. The work recovery torsion heat refrigeration device driven by planetary gears according to claim 1, characterized in that, At the beginning of the installation, only one set of planetary gears, clamps and shape memory alloy wires (113) are installed on the heat source side. After the set of shape memory alloy wires (113) has completed twisting and revolved to the heat sink side, another set of planetary gears, clamps and shape memory alloy wires (113) are installed on the heat source side. This allows the other set of shape memory alloy wires (113) to untwist while one set of shape memory alloy wires (113) is twisting. The work released by untwisting is recovered through gear transmission and used to assist in twisting.

5. The work-recovery torsion heat refrigeration device driven by planetary gears according to claim 1, characterized in that, The number of teeth of the inner gear sleeve (107), the sun gear (111), the first set of planetary gears and the second set of planetary gears satisfy the following relationship: when the number of teeth of the planetary gears on both sides is equal, the number of teeth of the inner gear sleeve = the number of teeth of the sun gear + 2 × the number of teeth of the planetary gears; The maximum number of twists of shape memory alloy = (number of teeth on the planetary gear side of the inner gear sleeve ÷ number of teeth on the planetary gear side of the inner gear sleeve + number of teeth on the sun gear ÷ number of teeth on the planetary gear side of the sun gear) × angle difference between the installation positions of the heat source and heat sink / 360°.

6. The work-recovery torsion heat refrigeration device driven by planetary gears according to claim 1, characterized in that, Multiple sets of planetary gears are installed in the circumferential direction of the first planetary carrier (106-1) and / or the second planetary carrier (106-2). Each set of planetary gears is equipped with a clamp to hold the shape memory alloy wire (113), and the heat exchange surface shape of the heat source and heat sink is adapted to the distribution of all shape memory alloy wires (113) on the same side.

7. The work-recovery torsion heat refrigeration device driven by planetary gears according to claim 1, characterized in that, It also includes a base plate (101) and a support structure. The drive motor (102), the inner gear sleeve (107) and the sun gear (111) are respectively fixed above the base plate (101) through the support structure. The base plate (101) has multiple mounting holes at different positions. By changing the mounting position of the support structure, the mounting position of the inner gear sleeve (107) and / or the sun gear (111) can be adjusted to adapt to shape memory alloy wires (113) of different lengths.

8. The work recovery torsion heat refrigeration device driven by planetary gears according to claim 1, characterized in that, The heat source and heat sink are installed through a heat source and heat sink fixing plate (115) and can be tightly attached to the shape memory alloy wire (113) to achieve solid-solid heat exchange; or, a fan is installed on the heat source and heat sink fixing plate (115) to perform heat exchange through forced convection.

9. The work-recovery torsion heat refrigeration device driven by planetary gears according to claim 1, characterized in that, Each set of clamps holds at least two shape memory alloy wires (113), and the multiple shape memory alloy wires (113) are twisted to form a spiral structure so that the multiple twisted shape memory alloy wires (113) are on the same axis.

10. A refrigeration method based on the work-recovery torsional heat refrigeration device driven by planetary gears as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Start the drive motor (102) to drive the first planetary carrier (106-1) and the second planetary carrier (106-2) to rotate synchronously, which drives the shape memory alloy wire (113) on the first set of planetary gears to twist during the revolution, and at the same time drives the shape memory alloy wire (113) on the second set of planetary gears to untwist during the revolution; When the twisted shape memory alloy wire (113) revolves with the planetary gear and comes into contact with the heat sink, the drive motor (102) is stopped, so that the twisted shape memory alloy wire (113) releases heat through the heat sink; The drive motor (102) is reversed, driving the first planetary carrier (106-1) and the second planetary carrier (106-2) to rotate in opposite directions, causing the twisted shape memory alloy wire (113) to untwist. When the corresponding shape memory alloy wire (113) revolves with the planetary gears to contact the heat source, the drive motor (102) is stopped, allowing the shape memory alloy wire (113) to absorb heat from the heat source. Repeat the above steps to achieve continuous cooling of the heat source.

Images