WO2021111778A1

WO2021111778A1 - Heat transfer device

Info

Publication number: WO2021111778A1
Application number: PCT/JP2020/040599
Authority: WO
Inventors: 健太郎椎; 嘉孝中村; 達也仲村; 佑亮小城原
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2019-12-02
Filing date: 2020-10-29
Publication date: 2021-06-10
Also published as: US20230010884A1; CN114746705A; JPWO2021111778A1

Abstract

A heat transfer device 50 comprises a first member 11, a first heat transfer element 21, and a second heat transfer element 22. The first member 11 contains a first solid material that exhibits a thermoelastic effect. In the first heat transfer element 21, a first contact area, which is the contact area between the first heat transfer element 21 and the first member 11, varies. In the second heat transfer element 22, a second contact area, which is the contact area between the second heat transfer element 22 and the first member 11, varies. The first contact area when the magnitude of the first external force applied to the first member 11 is smaller than a first threshold is larger than the first contact area when the magnitude of the first external force is equal to or greater than the first threshold. The second contact area when the magnitude of the first external force is smaller than the first threshold is smaller than the second contact area when the magnitude of the first external force is equal to or greater than the first threshold.

Description

Heat transfer device

This disclosure relates to a heat transfer device.

Conventionally, a technique of using a solid material exhibiting a thermoelastic effect for heat transfer is known.

For example, Patent Document 1 describes that a regenerator of a cooling system is composed of a plurality of solid cooling materials capable of exhibiting a thermoelastic effect. The cooling system includes a heat sink, a freezing space, and a regenerator. The solid cooling material is, for example, a shape memory alloy and is molded into a shape such as a wire.

Patent Document 2 describes that a large number of heat strain materials are used in each of the cooling and heating parts of the cooling and heating module that cools and heats air. The thermal strain material is composed of, for example, a shape memory alloy. The heat strain material is formed in the form of wires extending vertically.

Patent Document 3 describes a heat pump that utilizes a shape memory alloy. The belt is formed of shape memory alloy.

Japanese Unexamined Patent Publication No. 2012-220184 Japanese Unexamined Patent Publication No. 2014-098552 Japanese Unexamined Patent Publication No. 57-192761

In the techniques described in Patent Documents 1 to 3, it is not assumed that heat transfer by heat conduction is performed by changing the contact area between a member containing a solid material exhibiting a thermoelastic effect and a heat transfer body.

Therefore, the present disclosure provides a novel heat transfer device for performing heat transfer by heat conduction by changing the contact area between a member containing a solid material exhibiting a thermoelastic effect and a heat transfer body.

This disclosure is
A first member containing a first solid material exhibiting a thermoelastic effect,
A first heat transfer body in which the first contact area, which is the contact area between the first member, varies.
A second heat transfer body having a variable second contact area, which is a contact area between the first member, is provided.
The first contact area when the magnitude of the first external force applied to the first member is smaller than the first threshold value which is the threshold value of the endothermic reaction and the exothermic reaction in the thermoelastic effect of the first solid material is the first. The magnitude of the external force is larger than the first contact area when it is equal to or greater than the first threshold value.
The second contact area when the magnitude of the first external force is smaller than the first threshold value is smaller than the second contact area when the magnitude of the first external force is equal to or greater than the first threshold value.
Provide a heat transfer device.

According to the heat transfer device of the present disclosure, heat transfer by heat conduction can be performed by changing the contact area between a member containing a solid material exhibiting a thermoelastic effect and a heat transfer body.

FIG. 1 is a perspective view showing an example of the heat transfer device of the present disclosure. FIG. 2 is a cross-sectional view of the heat transfer device along the plane II shown in FIG. FIG. 3 is a perspective view showing the first member of the heat transfer device shown in FIG. FIG. 4 is a perspective view showing an example of the heat transfer device of the present disclosure. FIG. 5 is an enlarged perspective view of a part of the heat transfer device shown in FIG. FIG. 6 is a perspective view showing another example of the heat transfer device of the present disclosure. FIG. 7 is a cross-sectional view taken along the plane VII of the heat transfer device shown in FIG. FIG. 8 is a perspective view showing still another example of the heat transfer device of the present disclosure. FIG. 9 is a cross-sectional view of the heat transfer device along the plane IX shown in FIG. FIG. 10 is another cross-sectional view of the heat transfer device along the plane IX shown in FIG.

(Knowledge on which this disclosure was based)
By using a solid material exhibiting a thermoelastic effect to mediate heat transfer from a specific heat transfer body to another heat transfer body, a heat transfer device can be constructed without using fluorocarbon, hydrofluorocarbon, or the like. Can be considered. Such a heat transfer device is advantageous from the viewpoint of preventing ozone layer depletion and preventing global warming. For example, when an external force is applied to a solid material exhibiting a thermoelastic effect to cause a phase transition, heat of transition is generated. If the heat absorption and heat generation associated with such a thermoelastic effect can be effectively used in the heat transfer device, the value of the heat transfer device can be increased. In addition, if a solid material exhibiting a thermoelastic effect and a plurality of heat transfer bodies can be brought into contact with each other to generate heat transfer by heat conduction, the characteristics of the heat transfer device can be easily enhanced.

The present inventors have made extensive studies on a new heat transfer device from this point of view. As a result, the present inventors utilize the deformation of the solid material due to the adjustment of the external force for causing heat absorption and heat generation in the solid material exhibiting the thermoelastic effect, and make contact between the solid material and the plurality of heat transfer bodies. We have newly found that the area can be adjusted to the desired state. Based on this new finding, the present inventors have devised the heat transfer device of the present disclosure.

(Summary of one aspect of the present disclosure)
The heat transfer device according to the first aspect of the present disclosure is
A first member containing a first solid material exhibiting a thermoelastic effect,
A first heat transfer body in which the first contact area, which is the contact area between the first member, varies.
A second heat transfer body having a variable second contact area, which is a contact area between the first member, is provided.
The first contact area when the magnitude of the first external force applied to the first member is smaller than the first threshold value which is the threshold value of the endothermic reaction and the exothermic reaction in the thermoelastic effect of the first solid material is the first. The magnitude of the external force is larger than the first contact area when it is equal to or greater than the first threshold value.
The second contact area when the magnitude of the first external force is smaller than the first threshold value is smaller than the second contact area when the magnitude of the first external force is equal to or greater than the first threshold value.

According to the first aspect, the contact area between the first heat transfer body and the first member has a first external force larger than that when the first external force is equal to or larger than the first threshold value. Greater when less than one threshold. Therefore, when the magnitude of the first external force is smaller than the first threshold value, heat is easily transferred between the first heat transfer body and the first member by heat conduction. On the other hand, the contact area between the second heat transfer body and the first member is when the magnitude of the first external force is equal to or greater than the first threshold value as compared with the case where the magnitude of the first external force is smaller than the first threshold value. Greater than. Therefore, when the magnitude of the first external force is equal to or greater than the first threshold value, heat is likely to be transferred between the second heat transfer body and the first member by heat conduction. As described above, according to the first aspect, it is possible to transfer heat by heat transfer by changing the contact area between the solid material exhibiting the thermoelastic effect and the plurality of heat transfer bodies, and the solid material exhibiting the thermoelastic effect. Can mediate heat transport between the first and second heat transfer bodies. In addition, the thermoelastic effect can be exerted on the first solid material by the first external force, and the heat absorption and heat generation associated with the thermoelastic effect of the first solid material can be utilized in the heat transfer device.

In the second aspect of the present disclosure, for example, in the heat transfer device according to the first aspect, when the magnitude of the first external force is smaller than the first threshold value, the first contact area is larger than the second contact area. When the magnitude of the first external force is large and is equal to or greater than the first threshold value, the first contact area may be equal to or smaller than the second contact area. According to the second aspect, when the magnitude of the first external force is smaller than the first threshold value, heat transfer by heat conduction tends to be active between the first heat transfer body and the first member. In addition, when the magnitude of the first external force is equal to or greater than the first threshold value, heat transfer due to heat conduction tends to be active between the second heat transfer body and the first member.

In the third aspect of the present disclosure, for example, in the heat transfer device according to the first aspect or the second aspect, when the magnitude of the first external force is smaller than the first threshold value, the first solid material is the first. The first solid material may have a second phase different from the first phase when it has a phase and the magnitude of the first external force is equal to or greater than the first threshold value. According to the third aspect, the phase transition of the first solid material can be promoted by changing the magnitude of the first external force according to the first threshold value, and the thermoelastic effect can be exhibited.

In the fourth aspect of the present disclosure, for example, in the heat transfer device according to any one of the first to third aspects, the first member has a first inner circumference and a first outer circumference. One of the first heat transfer body and the second heat transfer body is arranged so as to face the first inner circumference, and the other of the first heat transfer body and the second heat transfer body faces the first outer circumference. May be arranged. According to the fourth aspect, the first contact area and the first contact area are adjusted by adjusting the first external force so that the first inner circumference or the first outer circumference of the first member is brought closer to the first heat transfer body or the second heat transfer body. The second contact area can be adjusted.

In the fifth aspect of the present disclosure, for example, in the heat transfer device according to the fourth aspect, the first member may be a first coil spring. According to the fifth aspect, the first contact area and the second contact area can be adjusted by adjusting the first external force around the axis of the first coil spring.

In the sixth aspect of the present disclosure, for example, in the heat transfer device according to the fifth aspect, a pair of cross sections perpendicular to the axis of the wire rod forming the first coil spring form the first inner circumference and the first outer circumference. It may contain parallel line segments. According to the sixth aspect, it is easy to increase the first contact area and the second contact area.

In the seventh aspect of the present disclosure, for example, the heat transfer device according to any one of the first to sixth aspects further includes a first drive mechanism for periodically increasing and decreasing the first external force. You may. According to the seventh aspect, the first external force can be periodically increased and decreased by the first driving mechanism.

In the eighth aspect of the present disclosure, for example, the heat transfer device according to any one of the first to seventh aspects is
A second member containing a second solid material exhibiting a thermoelastic effect,
A third heat transfer body in which the third contact area, which is the contact area between the second member, varies, is further provided.
The fourth contact area, which is the contact area between the second member and the second heat transfer body, fluctuates due to the fluctuation of the magnitude of the second external force applied to the second member.
When the magnitude of the second external force is smaller than the second threshold value which is the threshold value of the heat absorption reaction and the exothermic reaction in the thermoelastic effect of the second solid material, the magnitude of the second external force is the magnitude of the second external force. The fourth contact area, which is smaller than the third contact area when it is equal to or more than the second threshold value and the magnitude of the second external force is smaller than the second threshold value, has the magnitude of the second external force. It may be larger than the fourth contact area when it is equal to or more than the second threshold value.

According to the eighth aspect, the contact area between the third heat transfer body and the second member has a second external force larger than that when the second external force is smaller than the second threshold value. Greater when above the threshold. Therefore, when the magnitude of the second external force is equal to or greater than the second threshold value, heat is likely to be transferred between the third heat transfer body and the second member by heat conduction. On the other hand, the contact area between the second heat transfer body and the second member is when the magnitude of the second external force is smaller than the second threshold value as compared with the case where the magnitude of the second external force is equal to or larger than the second threshold value. Greater than. Therefore, when the magnitude of the second external force is smaller than the second threshold value, heat is easily transferred between the second heat transfer body and the second member by heat conduction. As described above, according to the eighth aspect, a plurality of members including a solid material exhibiting a thermoelastic effect and three or more heat transfer bodies are connected in series to increase the temperature difference between the plurality of heat transfer bodies. Cheap.

In the ninth aspect of the present disclosure, for example, in the heat transfer device according to the eighth aspect, when the magnitude of the second external force is smaller than the second threshold value, the third contact area is equal to or less than the fourth contact area. When the magnitude of the second external force is equal to or greater than the second threshold value, the third contact area may be larger than the fourth contact area. According to the ninth aspect, when the magnitude of the second external force is smaller than the second threshold value, heat transfer by heat conduction tends to be active between the second heat transfer body and the second member. In addition, when the magnitude of the second external force is equal to or greater than the second threshold value, heat transfer due to heat conduction tends to be active between the third heat transfer body and the second member.

In the tenth aspect of the present disclosure, for example, the heat transfer device according to any one of the first to seventh aspects is
A second member containing a second solid material exhibiting a thermoelastic effect,
A third heat transfer body in which the third contact area, which is the contact area between the second member, varies, is further provided.
The fourth contact area, which is the contact area between the second member and the second heat transfer body, fluctuates due to the fluctuation of the magnitude of the second external force applied to the second member.
When the magnitude of the second external force is smaller than the second threshold value which is the threshold value of the heat absorption reaction and the exothermic reaction in the thermoelastic effect of the second solid material, the magnitude of the second external force is the magnitude of the second external force. The fourth contact area, which is larger than the third contact area when the second threshold value or more and the magnitude of the second external force is smaller than the second threshold value, has the magnitude of the second external force. It may be smaller than the fourth contact area when it is equal to or more than the second threshold value.

According to the tenth aspect, the contact area between the third heat transfer body and the second member has a second external force larger than that when the second external force is equal to or larger than the second threshold value. Greater when less than 2 thresholds. Therefore, when the magnitude of the second external force is smaller than the second threshold value, heat is easily transferred between the third heat transfer body and the second member by heat conduction. On the other hand, the contact area between the second heat transfer body and the second member is when the magnitude of the second external force is equal to or greater than the second threshold value as compared with the case where the magnitude of the second external force is smaller than the second threshold value. Greater than. Therefore, when the magnitude of the second external force is equal to or greater than the second threshold value, heat is likely to be transferred between the second heat transfer body and the second member by heat conduction. As described above, according to the tenth aspect, a plurality of members including a solid material exhibiting a thermoelastic effect and three or more heat transfer bodies can be connected in series, and the temperature difference between the plurality of heat transfer bodies is increased. Cheap.

In the eleventh aspect of the present disclosure, for example, in the heat transfer device according to the tenth aspect, when the magnitude of the second external force is smaller than the second threshold value, the third contact area is larger than the fourth contact area. When the magnitude of the second external force is equal to or greater than the second threshold value, the third contact area may be equal to or smaller than the fourth contact area. According to the eleventh aspect, when the magnitude of the second external force is smaller than the second threshold value, heat transfer by heat conduction tends to be active between the third heat transfer body and the second member. In addition, when the magnitude of the second external force is equal to or greater than the second threshold value, heat transfer due to heat conduction tends to be active between the second heat transfer body and the second member.

In the twelfth aspect of the present disclosure, for example, in the heat transfer device according to any one of the eighth to eleventh aspects, when the magnitude of the second external force is smaller than the second threshold value, the second aspect is described. The solid material has a third phase, and when the magnitude of the second external force is equal to or greater than the second threshold value, the second solid material may have a fourth phase different from the third phase. Good. According to the twelfth aspect, the phase transition of the second solid material can be promoted by changing the magnitude of the second external force according to the second threshold value, and the thermoelastic effect can be exhibited.

In the thirteenth aspect of the present disclosure, for example, in the heat transfer device according to any one of the eighth to twelfth aspects, the second member has a second inner circumference and a second outer circumference, and the said One of the second heat transfer body and the third heat transfer body is arranged so as to face the second inner circumference, and the other of the second heat transfer body and the third heat transfer body faces the second outer circumference. May be arranged. According to the thirteenth aspect, the third contact area and the third contact area are adjusted by adjusting the second external force so that the second inner circumference or the second outer circumference of the second member is brought closer to the second heat transfer body or the third heat transfer body. The fourth contact area can be adjusted.

In the 14th aspect of the present disclosure, in the heat transfer device according to any one of the 8th to 13th aspects, the second member may be a second coil spring. According to the fourteenth aspect, the third contact area and the fourth contact area can be adjusted by adjusting the second external force around the axis of the second coil spring.

In the fifteenth aspect of the present disclosure, for example, in the heat transfer device according to any one of the eighth to the fourteenth aspects, the cross section of the wire rod forming the second coil spring is formed in the second aspect. It may include a pair of parallel line segments forming the circumference and the second outer circumference. According to the fifteenth aspect, it is easy to increase the third contact area and the fourth contact area.

In the 16th aspect of the present disclosure, for example, the heat transfer device according to any one of the 8th to 15th aspects further includes a second drive mechanism for periodically increasing and decreasing the second external force. You may. According to the 16th aspect, the second external force can be periodically increased and decreased by the second driving mechanism.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The following embodiments are merely examples, and the present disclosure is not limited to the following embodiments.

FIGS. 1 and 2 show an example of the heat transfer device of the present disclosure. The heat transfer device includes, for example, a main body 10a. The main body 10a includes a first member 11, a first heat transfer body 21, and a second heat transfer body 22. The first member 11 contains a first solid material that exhibits a thermoelastic effect. In the first heat transfer body 21, the first contact area, which is the contact area between the first heat transfer body 21 and the first member 11, varies. In the second heat transfer body 22, the second contact area, which is the contact area between the second heat transfer body 22 and the first member 11, varies. In the main body 10a, the first contact area when the magnitude of the first external force applied to the first member 11 is smaller than the first threshold value is larger than the first contact area when the magnitude of the first external force is equal to or greater than the first threshold value. Is also big. Therefore, when the magnitude of the first external force is smaller than the first threshold value, heat is easily transferred between the first heat transfer body 21 and the first member 11 by heat conduction. On the other hand, in the main body 10a, the second contact area when the magnitude of the first external force is smaller than the first threshold value is smaller than the second contact area when the magnitude of the first external force is equal to or larger than the first threshold value. The first threshold is the threshold of the endothermic reaction and the exothermic reaction in the thermoelastic effect of the first solid material. When the magnitude of the first external force is equal to or greater than the first threshold value, heat is easily transferred between the second heat transfer body 22 and the first member 11 by heat conduction. As described above, according to the heat transfer device provided with the main body 10a, the first contact area and the second contact area can be changed by adjusting the first external force, and the first member 11 is the first heat transfer. It can mediate heat transport between the body 21 and the second heat transfer body 22. In addition, by adjusting the first external force, the thermoelastic effect can be exerted in the first solid material, and the transition heat accompanying the thermoelastic effect can be utilized in the heat transfer device.

In the main body 10a, for example, when the magnitude of the first external force is smaller than the first threshold value, the first contact area is larger than the second contact area. As a result, when the magnitude of the first external force is smaller than the first threshold value, heat transfer due to heat conduction tends to be active between the first heat transfer body 21 and the first member 11. In addition, in the main body 10a, for example, when the magnitude of the first external force is equal to or greater than the first threshold value, the first contact area is equal to or less than the second contact area. As a result, when the magnitude of the first external force is equal to or greater than the first threshold value, heat transfer due to heat conduction tends to be active between the second heat transfer body 22 and the first member 11. The first contact area does not have to be larger than the second contact area in all periods when the magnitude of the first external force is smaller than the first threshold value. For example, the first contact is when the magnitude of the first external force is the minimum. The area is larger than the second contact area. The first contact area does not have to be less than or equal to the second contact area during all periods when the magnitude of the first external force is greater than or equal to the first threshold value. The area is larger than the second contact area.

The first contact area may be zero and the second contact area may be zero due to the fluctuation of the magnitude of the first external force. In other words, depending on the magnitude of the first external force, the first member 11 and the first heat transfer body 21 may not be in complete contact with each other, and the first member 11 and the second heat transfer body 22 may be in a state where they are not completely in contact with each other. May not be in complete contact with.

In the main body 10a, for example, when the magnitude of the first external force is smaller than the first threshold value, the first solid material has the first phase, and when the magnitude of the first external force is equal to or larger than the first threshold value, The first solid material has a second phase that is different from the first phase. By changing the magnitude of the first external force according to the first threshold value, the phase transition of the first solid material can be promoted and the thermoelastic effect can be exhibited. The second phase is, for example, a phase having a standard enthalpy of formation different from the standard enthalpy of formation of the first phase.

The first solid material is not limited to a specific material as long as it exhibits a thermoelastic effect. The first solid material may be, for example, a shape memory alloy, a thermoelastic polymer, or a plastic crystal. The shape memory alloy is, for example, a nickel-titanium alloy, a copper-aluminum-nickel alloy, or a copper-zinc-aluminum alloy. The thermoelastic polymer may be, for example, a block copolymer of polyethylene terephthalate (PET) and polyethylene oxide (PEO). The thermoelastic polymer may be, for example, a block copolymer containing polystyrene and poly (1,4-butadiene). The thermoelastic polymer may be, for example, an ABA triblock copolymer composed of poly (2-methyl-2-oxazoline) and polytetrahydrofuran. The thermoelastic polymer may be, for example, nylon or natural rubber. Plastic crystals include, for example, neopentyl glycol (NPG), pentaglycerin (PG), pentaerythritol (PE), 2-amino-2-methyl-1,3-propanediol (AMP), tris (hydroxymethyl) aminomethane (TRIS), 2-methyl-2-nitro-1-propanol (MNP) and 2-nitro-2-methyl-1,3-propanediol (NMP).

For example, when the first solid material is a nickel-titanium alloy, one of the first and second phases is an austenite phase, and the other of the first and second phases is a martensite phase. In this case, the first threshold is, for example, about 140 MPa. The first threshold value may be defined as a specific value, or may be defined as a set of values between a lower limit value and an upper limit value larger than the lower limit value.

FIG. 3 is a perspective view showing the first member 11. The first member 11 has, for example, a first inner circumference 11u and a first outer circumference 11s. As shown in FIG. 2, in the main body 10a, for example, the second heat transfer body 22 is arranged to face the first inner circumference 11u, and the first heat transfer body 21 is arranged to face the first outer circumference 11s. .. The first heat transfer body 21 may be arranged so as to face the first inner circumference 11u, and the second heat transfer body 22 may be arranged to face the first outer peripheral 11s. According to such a configuration, the first contact area is adjusted by adjusting the first external force so that the first inner circumference 11u or the first outer circumference 11s is brought closer to the first heat transfer body 21 or the second heat transfer body 22. And the second contact area can be adjusted.

In the main body 10a, the first heat transfer body 21 is, for example, an annular component arranged around the first member 11. The first heat transfer body 21 is formed of, for example, a metal material such as a metal or an alloy. The first heat transfer body 21 may be a hollow part or a solid part. When the first heat transfer body 21 is a hollow component, the inside of the first heat transfer body 21 may be filled with a liquid or powdery substance, or a fluid may flow.

In the main body 10a, the second heat transfer body 22 is, for example, a columnar or tubular part, and the first member 11 is arranged around the second heat transfer body 22. The second heat transfer body 22 is formed of, for example, a metal material such as a metal or an alloy. The second heat transfer body 22 may be a hollow part or a solid part. When the second heat transfer body 22 is a hollow component, the inside of the second heat transfer body 22 may be filled with a liquid or powdery substance, or a fluid may flow.

In the main body 10a, for example, the temperature of the first heat transfer body 21 is kept higher than the temperature of the second heat transfer body 22.

As shown in FIG. 3, the first member 11 is, for example, a first coil spring. According to such a configuration, the first contact area and the second contact area are adjusted by adjusting the first external force so as to twist the first coil spring 11 or to eliminate the twist of the first coil spring 11. Can be adjusted. In other words, the first contact area and the second contact area can be adjusted by adjusting the first external force around the axis of the first coil spring. The first member 11 may be a tubular component having a slit extending in the axial direction.

As shown in FIG. 2, in the main body 10a, the cross section perpendicular to the axis of the wire rod forming the first coil spring 11 includes, for example, a pair of parallel line segments forming the first inner circumference 11u and the first outer circumference 11s. .. According to such a configuration, it is easy to increase the first contact area and the second contact area. The cross section of the wire rod forming the first coil spring 11 perpendicular to the axis may be rectangular. For example, a gap is formed between the surface of the second heat transfer body 22 facing the first inner circumference 11u and the surface of the first heat transfer body 21 facing the first outer circumference 11s. The dimension of this gap in the direction perpendicular to the axis of the first coil spring 11 is larger than the distance between the pair of parallel line segments forming the first inner circumference 11u and the first outer circumference 11s. The first coil spring 11 is arranged in this gap.

As shown in FIG. 2, the main body 10a further includes, for example, a pin 35a, a rotating member 36, and a holding member 40a. The rotating member 36 is, for example, an annular member. The rotating member 36 is rotatably arranged around the axis of the first member 11 in contact with the first heat transfer body 21 in the axial direction of the first member 11. The pin 35a is attached to the rotating member 36, and a part of the pin 35a projects outward in the axial direction of the first member 11. One end of the first member 11 is fixed to the rotating member 36. The holding member 40a is, for example, an annular member. The holding member 40a is arranged in contact with the first heat transfer body 21 in the axial direction of the first member 11, for example. For example, the first heat transfer body 21 is arranged between the rotating member 36 and the holding member 40a in the axial direction of the first member 11. The end portion of the first coil spring 11 is housed inside the holding member 40a, and the end portion thereof is fixed to the holding member 40a.

As shown in FIG. 1, for example, when the pin 35a is in the initial position, most of the outer circumference 11s of the first member 11 is in contact with the first heat transfer body 21. Therefore, the temperature of the first member 11 rises due to the heat conduction between the first member 11 and the first heat transfer body 21. At this time, the first solid material contained in the first member 11 has a first phase. On the other hand, most of the inner circumference 11u of the first member 11 is separated from the second heat transfer body 22. The rotating member 36 can be rotated by moving the pin 35a around the axis of the first member 11. Thereby, the magnitude of the first external force applied to the first member 11 can be changed. For example, in FIG. 1, the rotating member 36 is rotated in the direction indicated by the arrow A. At this time, the first member 11 is deformed so as to be wound around the second heat transfer body 22. In addition, the first external force increases as the rotating member 36 rotates in the direction indicated by the arrow A. When the first external force becomes equal to or higher than the first threshold value with the rotation of the rotating member 36, the first phase shifts to the second phase in the first solid material. When the first external force becomes maximum, most of the inner circumference 11u of the first member 11 comes into contact with the second heat transfer body 22, and most of the outer circumference 11s of the first member 11 separates from the first heat transfer body 21. After that, the temperature of the first member 11 is lowered by the heat conduction between the first member 11 and the second heat transfer body 22. Next, in FIG. 1, the rotating member 36 is rotated toward the initial position of the pin 35a in the direction indicated by the arrow B. With this rotation, the first external force becomes smaller than the first threshold value, and the second phase shifts to the first phase in the first solid material. The temperature of the first member 11 is further lowered by the heat of transition accompanying the phase transition from the second phase to the first phase. When the pin 35a is returned to the initial position, most of the outer peripheral 11s of the first member 11 comes into contact with the first heat transfer body 21. At this time, the temperature of the first member 11 begins to rise due to the heat conduction between the first member 11 and the first heat transfer body 21.

As shown in FIG. 4, the heat transfer device 50 further includes, for example, a first drive mechanism 30 in addition to the main body 10a. The first drive mechanism 30 is a mechanism that periodically increases and decreases the first external force. As a result, the first contact area and the second contact area can be changed periodically.

The first drive mechanism 30 includes, for example, a motor 31, a rod 32, and a cam 33. As shown in FIG. 4, the rod 32 is connected to the motor 31, and the cam 33 is fixed to the tip of the rod 32. The cam 33 is, for example, an elliptical columnar component, and is in contact with, for example, the side surface of the pin 35a. The power generated by the motor 31 causes the rod 32 and the cam 33 to rotate around the axis of the rod 32. At this time, the pin 35a slides on the side surface of the cam 33. As a result, the motion of rotating the rotating member 36 in the direction indicated by the arrow A and the motion of rotating the rotating member 36 in the direction indicated by the arrow B in FIG. 1 are periodically repeated.

The heat transfer device 50 can be changed from various viewpoints. For example, the heat transfer device 50 may be modified to include the main body 10b shown in FIG. 6 instead of the main body 10a. The main body 10b is configured in the same manner as the main body 10a except for a portion to be described in particular. The same reference numerals are given to the components of the main body 10b that are the same as or corresponding to the components of the main body 10a, and detailed description thereof will be omitted. The description of the body 10a also applies to the body 10b, as long as there is no technical contradiction.

FIG. 7 is a cross-sectional view of the main body 10b along the plane VII shown in FIG. As shown in FIGS. 6 and 7, the main body 10b includes a second member 12 and a third heat transfer body 23 in addition to the first member 11, the first heat transfer body 21, and the second heat transfer body 22. Further prepared. The second member 12 contains a second solid material that exhibits a thermoelastic effect. In the main body 10b, the third contact area, which is the contact area between the third heat transfer body 23 and the second member 12, fluctuates. In addition, the fourth contact area, which is the contact area between the second member 12 and the second heat transfer body 22, fluctuates due to the fluctuation in the magnitude of the second external force applied to the second member 12. The third contact area when the magnitude of the second external force is smaller than the second threshold value is smaller than the third contact area when the magnitude of the second external force is greater than or equal to the second threshold value. Therefore, when the magnitude of the second external force is equal to or greater than the second threshold value, heat is easily transferred between the third heat transfer body 23 and the second member 12 by heat conduction. On the other hand, the fourth contact area when the magnitude of the second external force is smaller than the second threshold value is larger than the fourth contact area when the magnitude of the second external force is greater than or equal to the second threshold value. The second threshold is the threshold of the endothermic reaction and the exothermic reaction in the thermoelastic effect of the second solid material. Therefore, when the magnitude of the second external force is smaller than the second threshold value, heat is easily transferred between the second heat transfer body 22 and the second member 12 by heat conduction. According to the main body 10b, the first member 11 and the second member 12 and the first heat transfer body 21, the second heat transfer body 22, and the third heat transfer body 23 are connected in series, for example, the first heat transfer body. It is easy to increase the temperature difference between the heat body 21, the second heat transfer body 22, and the third heat transfer body 23.

In the main body 10b, for example, when the magnitude of the second external force is smaller than the second threshold value, the third contact area is equal to or less than the fourth contact area. As a result, when the magnitude of the second external force is smaller than the second threshold value, heat transfer due to heat conduction tends to be active between the second heat transfer body 22 and the second member 12. In addition, when the magnitude of the second external force is equal to or greater than the second threshold value, the third contact area is larger than the fourth contact area. As a result, when the magnitude of the second external force is equal to or greater than the second threshold value, heat transfer due to heat conduction tends to be active between the third heat transfer body 23 and the second member 12. The third contact area does not have to be less than or equal to the fourth contact area in all periods when the magnitude of the second external force is smaller than the second threshold value. The contact area is equal to or less than the fourth contact area. The third contact area does not have to be larger than the fourth contact area during all periods when the magnitude of the second external force is equal to or greater than the second threshold value. For example, when the magnitude of the second external force is maximum, the third contact area does not need to be larger. Is larger than the fourth contact area.

The third contact area may be zero and the fourth contact area may be zero due to the fluctuation of the magnitude of the second external force. In other words, depending on the magnitude of the second external force, the second member 12 and the second heat transfer body 22 may not be in complete contact with each other, and the second member 12 and the third heat transfer body 23 may be in a state where they are not completely in contact with each other. May not be in complete contact with.

In the main body 10b, when the magnitude of the second external force is smaller than the second threshold value, the second solid material 12 has the third phase, and when the magnitude of the second external force is equal to or larger than the second threshold value, the second solid material 12 has a third phase. The 2 solid material 12 may have a fourth phase different from the third phase. According to such a configuration, the phase transition of the second solid material can be promoted by changing the magnitude of the second external force according to the second threshold value, and the thermoelastic effect can be exhibited. The fourth phase is, for example, a phase having a standard enthalpy of formation different from the standard enthalpy of formation of the third phase.

The second solid material is not limited to a specific material as long as it exhibits a thermoelastic effect. The second solid material can be, for example, the material shown as an example of the first solid material. The second solid material may be the same type of material as the first solid material, or may be a different type of material from the first solid material.

For example, when the second solid material is a nickel-titanium alloy, one of the third and fourth phases is an austenite phase, and the other of the third and fourth phases is a martensite phase. In this case, the second threshold is, for example, about 140 MPa. The second threshold value may be defined as a specific value, or may be defined as a set of values between a lower limit value and an upper limit value larger than the lower limit value.

As shown in FIG. 7, in the main body 10b, the second member 12 has a second inner circumference 12u and a second outer circumference 12s. The second heat transfer body 22 may be arranged so as to face the second inner circumference 12u, and the third heat transfer body 23 may be arranged so as to face the second outer circumference 12s. The third heat transfer body 23 may be arranged so as to face the second inner circumference 12u, and the second heat transfer body 22 may be arranged to face the first outer peripheral 11s. According to such a configuration, the third contact area is adjusted by adjusting the second external force so that the second inner circumference 12u or the second outer circumference 12s is brought closer to the second heat transfer body 22 or the third heat transfer body 23. And the fourth contact area can be adjusted. The second member 12 may be a tubular component having a slit extending in the axial direction.

As shown in FIG. 7, the second member 12 is a second coil spring. According to such a configuration, the third contact area and the fourth contact area can be adjusted by adjusting the second external force so as to twist the second coil spring 12 or to eliminate the twist of the second coil spring 12. Can be adjusted. In other words, the third contact area and the fourth contact area can be adjusted by applying a second external force around the axis of the second coil spring.

In the main body 10b, the cross section perpendicular to the axis of the wire rod forming the second coil spring 12 includes, for example, a pair of parallel line segments forming the second inner circumference 12u and the second outer circumference 12s. According to such a configuration, it is easy to increase the third contact area and the fourth contact area. The cross section of the wire rod forming the second coil spring 12 perpendicular to the axis may be rectangular. For example, a gap is formed between the surface of the second heat transfer body 22 facing the second inner circumference 12u and the surface of the third heat transfer body 23 facing the second outer circumference 12s. The dimension of this gap in the direction perpendicular to the axis of the second coil spring 12 is larger than the distance between the pair of parallel line segments forming the second inner circumference 12u and the second outer circumference 12s. The second coil spring 12 is arranged in this gap.

As shown in FIGS. 6 and 7, the main body 10b further includes, for example, a pin 35b, a rotating member 36, a first holding member 40b, and a second holding member 40c. The pin 35b is attached to the rotating member 36, and a part of the pin 35b projects outward in a direction perpendicular to the axis of the first member 11. One ends of the first member 11 and the second member 12 are fixed to the rotating member 36, respectively. Each of the first holding member 40b and the second holding member 40c is, for example, an annular member. The first holding member 40b is arranged in contact with the first heat transfer body 21 in the axial direction of the first member 11, for example. The second holding member 40c is arranged in contact with the third heat transfer body 23 in the axial direction of the second member 12, for example. For example, the first heat transfer body 21 is arranged between the rotating member 36 and the first holding member 40b in the axial direction of the first member 11, and the rotating member 36 and the second member 12 are arranged in the axial direction of the second member 12. The first heat transfer body 21 is arranged between the two holding members 40c. The end of the first coil spring 11 is housed inside the first holding member 40b, and the end thereof is fixed to the holding member 40b. The end of the second coil spring 12 is housed inside the second holding member 40c, and the end thereof is fixed to the holding member 40c.

As shown in FIG. 7, in the main body 10b, the second heat transfer body 22 is, for example, a columnar or tubular part, and the first member 11, the second member 12, and the rotation around the second heat transfer body 22. The member 36 is arranged. The second heat transfer body 22 is formed of, for example, a metal material such as a metal or an alloy. The second heat transfer body 22 may be a hollow part or a solid part. When the second heat transfer body 22 is a hollow component, the inside of the second heat transfer body 22 may be filled with a liquid or powdery substance, or a fluid may flow.

In the main body 10b, the third heat transfer body 23 is, for example, an annular component arranged around the second member 12. The third heat transfer body 23 is formed of, for example, a metal material such as a metal or an alloy. The third heat transfer body 23 may be a hollow part or a solid part. When the third heat transfer body 23 is a hollow component, the inside of the third heat transfer body 23 may be filled with a liquid or powdery substance, or a fluid may flow.

In the main body 10b, for example, the temperature of the first heat transfer body 21 is kept higher than the temperature of the second heat transfer body 22, and the temperature of the second heat transfer body 22 is higher than the temperature of the third heat transfer body 23. It is kept high.

As shown in FIG. 7, for example, when the pin 35b is in the initial position, most of the outer circumference 11s of the first member 11 is in contact with the first heat transfer body 21. Therefore, the temperature of the first member 11 rises due to the heat conduction between the first member 11 and the first heat transfer body 21. On the other hand, most of the inner circumference 12u of the second member 12 is in contact with the second heat transfer body 22. Therefore, the temperature of the second member 12 rises due to the heat conduction between the second member 12 and the second heat transfer body 22. At this time, the second solid material contained in the second member 12 has a third phase. On the other hand, most of the outer circumference 12s of the second member 12 is separated from the third heat transfer body 23. The rotating member 36 can be rotated by moving the pin 35b around the axis of the first member 11. Thereby, the magnitude of the first external force applied to the first member 11 and the magnitude of the second external force applied to the second member 12 can be changed. When the second external force becomes equal to or higher than the second threshold value, the third phase shifts to the fourth phase in the second solid material, and the temperature of the second member 12 rises due to the transition heat accompanying the phase transition from the third phase to the fourth phase. It will rise further. In addition, the second member 12 is deformed so as to be pressed against the third heat transfer body 23, and most of the outer circumference 12s of the second member 12 comes into contact with the third heat transfer body 23, and the inside of the second member 12 Most of the circumference 12s is separated from the second heat transfer body 22. After that, the temperature of the second member 12 drops due to heat conduction between the second member 12 and the third heat transfer body 23. Next, the rotating member 36 is rotated in the opposite direction so as to return the pin 35b to the initial position. At this time, the second external force becomes smaller than the second threshold value, and the fourth phase shifts to the third phase in the second solid material. The temperature of the second member 12 is further lowered by the heat of transition accompanying the phase transition from the fourth phase to the third phase. When the pin 35b is returned to the initial position, most of the inner circumference 12u of the second member 12 comes into contact with the second heat transfer body 22, and the heat conduction between the second member 12 and the second heat transfer body 22 causes the second member 12 to come into contact with the second heat transfer body 22. 2 The temperature of the member 12 begins to rise.

The main body 10b may further include a second drive mechanism in addition to the first drive mechanism 30, for example. The second drive mechanism is a mechanism that periodically increases and decreases the second external force. The first drive mechanism 30 may also serve as the second drive mechanism. For example, the cam 33 of the first drive mechanism 30 is brought into contact with the side surface of the pin 35b. The power generated by the motor 31 causes the rod 32 and the cam 33 to rotate around the axis of the rod 32. At this time, the pin 35b slides on the side surface of the cam 33. Thereby, the second external force can be increased and decreased periodically. The second drive mechanism may be configured as a mechanism independent of the first drive mechanism 30.

The main body 10b may be changed as shown in the main body 10c shown in FIGS. 8 to 10. The main body 10c is configured in the same manner as the main body 10b except for a portion to be described in particular. The same components as or corresponding to the components of the main body 10b are designated by the same reference numerals, and detailed description thereof will be omitted. The description of the

main bodies

10a and 10b also applies to the main body 10c, unless technically inconsistent.

As shown in FIGS. 8 to 10, the main body 10c has the second member 12 and the third member 12 in addition to the first member 11, the first heat transfer body 21, and the second heat transfer body 22, similarly to the main body 10b. It includes a heat transfer body 23. 9 and 10 are cross-sectional views of the main body 10c along the plane IX shown in FIG. FIG. 9 shows the state of the main body 10c when the magnitude of the first external force is smaller than the first threshold value and the magnitude of the second external force is smaller than the second threshold value. On the other hand, FIG. 10 shows the state of the main body 10c when the magnitude of the first external force is equal to or greater than the first threshold value and the magnitude of the second external force is equal to or greater than the second threshold value. The main body 10c is configured so that the third contact area when the magnitude of the second external force is smaller than the second threshold value is larger than the third contact area when the magnitude of the second external force is greater than or equal to the second threshold value. Has been done. In this case, the main body 10c so that the fourth contact area when the magnitude of the second external force is smaller than the second threshold value is smaller than the fourth contact area when the magnitude of the second external force is greater than or equal to the second threshold value. Is configured. According to such a configuration, when the magnitude of the second external force is smaller than the second threshold value, heat is easily transferred between the third heat transfer body 23 and the second member 12 by heat conduction. Further, when the magnitude of the second external force is equal to or larger than the second threshold value, heat is easily transferred between the second heat transfer body 22 and the second member 12 by heat conduction.

The main body 10c may be further configured as follows. For example, in the main body 10c, when the magnitude of the second external force is smaller than the second threshold value, the third contact area is larger than the fourth contact area. As a result, when the magnitude of the second external force is smaller than the second threshold value, heat transfer due to heat conduction tends to be active between the third heat transfer body 23 and the second member 12. In addition, when the magnitude of the second external force is equal to or greater than the second threshold value, the third contact area is equal to or less than the fourth contact area. When the magnitude of the second external force is equal to or greater than the second threshold value, heat transfer due to heat conduction tends to be active between the second heat transfer body 22 and the second member 12. The third contact area does not have to be larger than the fourth contact area in all periods when the magnitude of the second external force is smaller than the second threshold value. For example, when the magnitude of the second external force is the minimum, the third contact The area is larger than the fourth contact area. The third contact area does not have to be less than or equal to the fourth contact area during all periods when the magnitude of the second external force is greater than or equal to the second threshold value. The area is equal to or less than the fourth contact area.

As shown in FIG. 9, the main body 10c includes a first rotating member 36a and a second rotating member 36b. The first rotating member 36a is fixed to the first heat transfer body 21, and the second rotating member 36b is fixed to the third heat transfer body 23. The first heat transfer body 21 is formed in a rotating body shape including, for example, a base portion and a protruding portion protruding from the base portion. The second heat transfer body 22 is formed in a rotating body shape including, for example, a tubular portion having a bottom portion and a protruding portion protruding from the bottom portion of the tubular portion. The third heat transfer body 23 is formed in a rotating body shape including a tubular portion having a bottom portion. The axis of the first heat transfer body 21, the axis of the second heat transfer body 22, and the axis of the third heat transfer body 23 extend on the same straight line, for example. One end of the first member 11 is fixed to the base of the first heat transfer body 21. The other end of the first member 11 is fixed to the inner surface of the bottom portion of the tubular portion of the second heat transfer body 22. One end of the second member 12 is fixed to the inner surface of the bottom of the third heat transfer body 23. The other end of the second member 12 is fixed to the outer surface of the bottom portion of the tubular portion of the second heat transfer body 22. The first member 11 is arranged around the protruding portion of the first heat transfer body 21, and is housed inside the tubular portion of the first heat transfer body 21. The second member 12 is arranged around the protruding portion of the second heat transfer body 21, and is housed inside the tubular portion of the third heat transfer body 23.

As shown in FIG. 9, the main body 10c further includes a heat insulating material 21d, a heat insulating material 22d, a heat insulating material 22k, and a heat insulating material 23k. The thermal conductivity of these heat insulating materials is lower than, for example, the thermal conductivity of the first member 11 and the second member 12. The heat insulating material 21d is annular and covers the base portion at the boundary between the base portion and the protruding portion in the first heat transfer body 21. The heat insulating material 22d is annular and covers the outer surface of the bottom portion of the second heat transfer body 22 at the boundary between the bottom portion and the protruding portion of the tubular portion. The heat insulating material 22k covers the inner surface of the bottom portion of the tubular portion in the second heat transfer body 22. The heat insulating material 23k covers the inner surface of the bottom portion of the tubular portion in the third heat transfer body 23.

As shown in FIG. 8, the main body 10c further includes, for example, a cylinder 15. The first member 11, the second member 12, the first heat transfer body 21, the second heat transfer body 22, and the third heat transfer body 23 are housed inside the cylinder 15. The inner surface of the cylinder 15 is made of a heat insulating material. The thermal conductivity of this heat insulating material is, for example, lower than the thermal conductivity of the first member 11 and the second member 12. The axis of the cylinder 15 extends on the same straight line as, for example, the axis of the first heat transfer body 21, the axis of the second heat transfer body 22, and the axis of the third heat transfer body 23.

For example, when the first rotating member 36a is rotated in the direction of the arrow A1 in FIG. 8 by a predetermined drive mechanism (not shown), the first external force becomes large and the first external force becomes equal to or higher than the first threshold value. After that, the first rotating member 36a is rotated in the direction of the arrow B1 in FIG. 8 by the driving mechanism, so that the first external force becomes small and the first external force becomes smaller than the first threshold value. On the other hand, the second external force is increased by rotating the second rotating member 36b in the direction of the arrow A2 in FIG. 8 by a predetermined drive mechanism (not shown). After that, the second rotating member 36b is rotated in the direction of the arrow B2 in FIG. 8 by the driving mechanism, so that the second external force is reduced.

In the main body 10c, for example, the temperature of the second heat transfer body 22 is kept higher than the temperature of the first heat transfer body 21, and the temperature of the third heat transfer body 23 is higher than the temperature of the second heat transfer body 22. It is kept high.

Claims

A first member containing a first solid material exhibiting a thermoelastic effect,
A first heat transfer body in which the first contact area, which is the contact area between the first member, varies.
A second heat transfer body having a variable second contact area, which is a contact area between the first member, is provided.
The first contact area when the magnitude of the first external force applied to the first member is smaller than the first threshold value which is the threshold value of the endothermic reaction and the exothermic reaction in the thermoelastic effect of the first solid material is the first. The magnitude of the external force is larger than the first contact area when it is equal to or greater than the first threshold value.
The second contact area when the magnitude of the first external force is smaller than the first threshold value is smaller than the second contact area when the magnitude of the first external force is equal to or greater than the first threshold value.
Heat transfer device.
When the magnitude of the first external force is smaller than the first threshold value, the first contact area is larger than the second contact area.
The heat transfer device according to claim 1, wherein when the magnitude of the first external force is equal to or greater than the first threshold value, the first contact area is equal to or smaller than the second contact area.
When the magnitude of the first external force is smaller than the first threshold value, the first solid material has a first phase, and when the magnitude of the first external force is equal to or larger than the first threshold value, the first solid material has the first phase. The heat transfer device according to claim 1 or 2, wherein the first solid material has a second phase different from the first phase.
The first member has a first inner circumference and a first outer circumference.
One of the first heat transfer body and the second heat transfer body is arranged so as to face the first inner circumference.
The other of the first heat transfer body and the second heat transfer body is arranged so as to face the first outer periphery.
The heat transfer device according to any one of claims 1 to 3.
The heat transfer device according to claim 4, wherein the first member is a first coil spring.
The heat transfer device according to claim 5, wherein the cross section perpendicular to the axis of the wire rod forming the first coil spring includes a pair of parallel line segments forming the first inner circumference and the first outer circumference.
The heat transfer device according to any one of claims 1 to 6, further comprising a first drive mechanism for periodically increasing and decreasing the first external force.
A second member containing a second solid material exhibiting a thermoelastic effect,
A third heat transfer body in which the third contact area, which is the contact area between the second member, varies, is further provided.
The fourth contact area, which is the contact area between the second member and the second heat transfer body, fluctuates due to the fluctuation of the magnitude of the second external force applied to the second member.
When the magnitude of the second external force is smaller than the second threshold value which is the threshold value of the endothermic reaction and the exothermic reaction in the thermoelastic effect of the second solid material, the magnitude of the second external force is the magnitude of the second external force. It is smaller than the third contact area when it is equal to or more than the second threshold value.
The fourth contact area when the magnitude of the second external force is smaller than the second threshold value is larger than the fourth contact area when the magnitude of the second external force is equal to or greater than the second threshold value.
The heat transfer device according to any one of claims 1 to 7.
When the magnitude of the second external force is smaller than the second threshold value, the third contact area is equal to or less than the fourth contact area.
When the magnitude of the second external force is equal to or greater than the second threshold value, the third contact area is larger than the fourth contact area.
The heat transfer device according to claim 8.
A second member containing a second solid material exhibiting a thermoelastic effect,
A third heat transfer body in which the third contact area, which is the contact area between the second member, varies, is further provided.
The fourth contact area, which is the contact area between the second member and the second heat transfer body, fluctuates due to the fluctuation of the magnitude of the second external force applied to the second member.
When the magnitude of the second external force is smaller than the second threshold value which is the threshold value of the endothermic reaction and the exothermic reaction in the thermoelastic effect of the second solid material, the magnitude of the second external force is the magnitude of the second external force. Larger than the third contact area when it is equal to or higher than the second threshold value,
The fourth contact area when the magnitude of the second external force is smaller than the second threshold value is smaller than the fourth contact area when the magnitude of the second external force is equal to or greater than the second threshold value.
The heat transfer device according to any one of claims 1 to 7.
When the magnitude of the second external force is smaller than the second threshold value, the third contact area is larger than the fourth contact area.
When the magnitude of the second external force is equal to or greater than the second threshold value, the third contact area is equal to or smaller than the fourth contact area.
The heat transfer device according to claim 10.
When the magnitude of the second external force is smaller than the second threshold value, the second solid material has a third phase, and when the magnitude of the second external force is equal to or greater than the second threshold value, the second solid material has the third phase. The heat transfer device according to any one of claims 8 to 11, wherein the second solid material has a fourth phase different from the third phase.
The second member has a second inner circumference and a second outer circumference.
One of the second heat transfer body and the third heat transfer body is arranged so as to face the second inner circumference.
The heat transfer device according to any one of claims 8 to 12, wherein the second heat transfer body and the other of the third heat transfer bodies are arranged so as to face the second outer periphery.
The heat transfer device according to any one of claims 8 to 13, wherein the second member is a second coil spring.
The heat transfer device according to claim 14, wherein a cross section perpendicular to the axis of the wire forming the second coil spring includes a pair of parallel line segments forming the second inner circumference and the second outer circumference.
The heat transfer device according to any one of claims 8 to 15, further comprising a second drive mechanism for periodically increasing and decreasing the second external force.