JP2022035191A - Heat pipe thermostatic bath - Google Patents

Abstract

To provide a heat pipe thermostatic bath improved in cooling efficiency of a Peltier element.SOLUTION: A heat pipe thermostatic bath comprises: first and second heat pipes in which a coolant is circulated between the inside and the outside of a thermostatic bath; a heat exchange section which transfers heat in the thermostatic bath to the first and second heat pipes inside of the thermostatic bath; a heat dissipation section which dissipates heat of the first and second heat pipes outside of the thermostatic bath; a heat absorption section which is provided between the heat exchange section and the heat dissipation section and absorbs the heat of the first and second heat pipes using the Peltier element; and a third heat pipe which is provided over the heat dissipation section and the heat absorption section and transfers heat discharged from the Peltier element to the heat dissipation section. The third heat pipe is disposed between the first and second heat pipes. The Peltier element is provided between the third heat pipe and the first and second heat pipes, respectively, in the heat absorption section. Each of heat absorption surfaces is in contact with the first and second heat pipes, and each of heat dissipation surfaces is in contact with the third heat pipe.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat pipe constant temperature bath.

A technique for improving cooling performance by using a Pelche element for a heat pipe is known. Since the perche element itself has a large amount of heat dissipation, it is necessary to cool the perche element. For example, Patent Document 1 discloses a technique for cooling a Pelche element using a blower fan.

Japanese Unexamined Patent Publication No. 2008-203211

However, there are cases where cooling of the Pelche element by a blower fan as disclosed in Patent Document 1 is insufficient. The present invention has been made in preparation for such an insufficient case, and an object of the present invention is to provide a heat pipe constant temperature bath having excellent cooling efficiency of a Pelche element.

The heat pipe constant temperature bath according to the present invention is
The first and second heat pipes provided in the constant temperature bath and outside the constant temperature bath and in which the refrigerant circulates, and
A heat radiating unit that dissipates heat from the first and second heat pipes outside the constant temperature bath.
A heat exchange unit provided in the constant temperature bath and transmitting heat in the constant temperature bath to the first and second heat pipes.
A heat absorbing section outside the constant temperature bath, which is provided between the heat exchange section and the heat radiating section and absorbs heat from the first and second heat pipes using a Pelche element.
A third heat pipe, which is provided over the heat radiating portion and the heat absorbing portion and transfers the heat released from the Pelche element to the heat radiating portion, is provided.
The third heat pipe is arranged between the first and second heat pipes.
The Pelche element is a pair of Pelche elements provided in the heat absorbing portion between the third heat pipe and the first and second heat pipes, respectively.
Each of the endothermic surfaces of the pair of Pelche elements is provided so as to be in contact with the first and second heat pipes.
Each of the heat dissipation surfaces of the pair of Pelche elements is provided so as to be in contact with the third heat pipe.
The heat released from the heat radiating surface of the pair of Pelche elements is transferred to the heat radiating portion via the third heat pipe.

In the heat pipe constant temperature bath according to the present invention, the third heat pipe is arranged between the first and second heat pipes, and in the heat absorbing portion, the third heat pipe and the first and second heats are provided. A pair of Pelche elements are arranged in each of the pipes. Each of the heat radiating surfaces of the pair of Pelche elements is provided so as to be in contact with the third heat pipe, and the heat released from the heat radiating surfaces of the pair of Pelche elements is transferred to the heat radiating portion via the third heat pipe. Be transmitted. Therefore, the cooling efficiency of the Pelche element is excellent.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a heat pipe constant temperature bath having excellent cooling efficiency of a Pelche element.

It is a perspective view of the heat pipe constant temperature bath which concerns on 1st Embodiment. It is a schematic sectional drawing which shows the structure of the heat pipe constant temperature bath which concerns on 1st Embodiment.

Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, in order to clarify the explanation, the following description and drawings are appropriately simplified.

(First Embodiment)
Hereinafter, the heat pipe constant temperature bath according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of a heat pipe constant temperature bath according to the first embodiment. FIG. 2 is a schematic cross-sectional view showing the configuration of the heat pipe constant temperature bath according to the first embodiment. As a matter of course, the right-handed xyz orthogonal coordinates shown in FIGS. 1 and 2 are for convenience in explaining the positional relationship of the components. Normally, the z-axis positive direction is vertically upward, and the xy plane is a horizontal plane, which is common between drawings.

As shown in FIG. 1, the heat pipe constant temperature bath 1 according to the first embodiment includes a heat pipe 11-13, a heat dissipation unit 20, a heat absorption unit 30, and a heat exchange unit 40. The heat pipe constant temperature bath 1 is used, for example, for testing and analysis under a constant temperature.

The heat pipe 11 (first heat pipe) and the heat pipe 12 (second heat pipe) are metal pipes such as copper pipes in which a refrigerant circulates inside. However, depending on the target constant temperature bath temperature, energy saving performance, and allowable dimensions, the materials constituting the heat pipes 11 and 12 may be other metals having high thermal conductivity such as aluminum, iron, and stainless steel.
As shown in FIG. 1, the heat pipes 11 and 12 have a loop structure that circulates between the heat exchange unit 40 provided in the constant temperature bath, the heat dissipation unit 20 provided outside the constant temperature bath, and the heat absorption unit 30. There is. The refrigerant warmed in the heat exchange section 40 is sequentially cooled in the heat dissipation section 20 and the heat absorption section 30. The heat pipes 11 and 12 are provided substantially in parallel over the entire circumference.

Hereinafter, the configurations of the heat pipes 11 and 12 shown in FIG. 1 will be described in detail.
As shown in FIG. 1, in the constant temperature bath, the heat pipes 11 and 12 are branched in parallel in the x-axis direction and extended in the y-axis direction, and penetrate the inside of the heat exchange unit 40. ..
The heat pipes 11 and 12 extending along the x-axis direction along the y-axis negative side end of the heat exchange unit 40 are bent in an L shape at the x-axis negative side end, and the heat radiation unit 20 and Along the end surface on the negative side of the y-axis of the heat absorbing portion 30, it extends in the positive direction of the z-axis. Here, the x-axis positive side ends of the heat pipes 11 and 12 extending along the x-axis direction along the y-axis negative side end of the heat exchange unit 40 are closed.
Further, the heat pipes 11 and 12 are bent in an L shape at the end portion on the positive side of the z-axis, and extend in the positive direction on the y-axis along the side surface on the positive side of the z-axis of the heat radiating portion 20.

On the other hand, as shown in FIG. 1, the heat pipes 11 and 12 extending along the x-axis direction along the y-axis positive side end of the heat exchange unit 40 are U at the x-axis negative side end. It is bent in a shape and extends in the negative direction of the y-axis along the side surface of the heat absorbing portion 30 on the negative side of the z-axis. Here, the x-axis positive side ends of the heat pipes 11 and 12 extending along the x-axis direction along the y-axis positive side end of the heat exchange unit 40 are closed.
The heat pipes 11 and 12 extending in the y-axis direction along the z-axis positive side side surface of the heat radiating portion 20 and the z-axis negative side side surface of the endothermic portion 30 are branched side by side in parallel in the y-axis direction. It is extended in the z-axis direction and penetrates the inside of the heat radiating portion 20 and the heat absorbing portion 30. Here, the y-axis positive side end portions of the heat pipes 11 and 12 extending along the y-axis direction along the z-axis positive direction side surface of the heat radiating portion 20 are closed. Further, the y-axis negative side ends of the heat pipes 11 and 12 extending along the y-axis direction along the z-axis negative side side surface of the heat absorbing portion 30 are closed.

Like the heat pipes 11 and 12, the heat pipe 13 (third heat pipe) is also a metal pipe such as a copper pipe in which a refrigerant circulates inside. The heat pipes 13 extending in the y-axis direction along the z-axis positive side side surface of the heat radiating portion 20 and the z-axis negative side side surface of the endothermic portion 30 are branched in parallel in the y-axis direction and z. It extends in the axial direction and penetrates the inside of the heat radiating portion 20 and the heat absorbing portion 30.

As shown in FIG. 2, the heat pipe 13 extends in the z-axis direction over the heat radiating portion 20 and the heat absorbing portion 30, and is arranged between the heat pipes 11 and 12. Note that FIG. 2 is not a cross-sectional view obtained by cutting FIG. 1 on a specific plane, but is a schematic cross-sectional view for showing the internal structures of the heat radiating portion 20 and the heat absorbing portion 30. Here, as shown in FIG. 1, the y-axis positive side end portion and the y-axis negative direction side of the heat pipe 13 extending along the y-axis direction along the z-axis positive direction side surface of the heat dissipation portion 20. The ends are closed. Further, the y-axis positive side end portion and the y-axis negative direction end portion of the heat pipe 13 extending along the y-axis direction along the z-axis negative direction side surface of the heat absorbing portion 30 are closed.

In the heat absorbing portion 30 outside the constant temperature bath, the Pelche element 50 is arranged between the heat pipe 11 and the heat pipe 13, and between the heat pipe 12 and the heat pipe 13. The heat pipe 13 is used to transfer the heat released from the Pelche element 50 by the heat absorbing unit 30 to the heat radiating unit 20. In other words, the heat pipe 13 is used for cooling the Pelche element 50. By adopting a three-layer structure composed of three heat pipes of the heat pipes 11-13, the cooling of the Pelche element 50 can be made more efficient. The mechanism for improving the cooling efficiency of the Pelche element 50 will be described later with reference to FIG. Further, by adopting a structure in which the pair of Pelche elements 50 are cooled by one heat pipe 13, the number of heat pipes is one as compared with the case where the pair of Pelche elements 50 are cooled by two different heat pipes. It can be reduced and miniaturized.

In the example shown in FIG. 2, the heat pipe constant temperature bath 1 has a three-layer structure of heat pipes 11-13. The heat pipe constant temperature bath 1 may have a five-layer structure in which another Pelche element is newly provided on the outside of the heat pipes 11 and 12 and a heat pipe dedicated to cooling the Pelche element is separately provided. In this case, the power consumption is large, but the cooling capacity can be improved. In addition to the three-layer structure and the five-layer structure, the heat pipe constant temperature bath 1 may have a multi-layer structure in which the number of layers provided with the Perche element and the heat pipe for cooling the Perche element is arbitrarily increased.

The heat radiating unit 20 is a heat exchanger provided outside the constant temperature bath in order to dissipate the heat of the heat pipes 11-13. In the example shown in FIG. 1, the heat radiation unit 20 has a rectangular parallelepiped shape whose main surface is parallel to the yz plane and extends in the z-axis direction. In the heat radiating unit 20, it is important to increase the cooling capacity. Therefore, in the heat radiating unit 20, a porous metallic copper fin having a heat transport amount of 6 times or more that of a normal metal fin made of, for example, copper or aluminum may be used. As a result, the cooling efficiency of the heat pipes 11-13 can be improved in the heat radiating unit 20. Since porous metallic copper has a higher cooling efficiency than copper or aluminum metal fins, the amount of fins themselves used can be reduced as compared with the case where copper or aluminum metal fins are used. This makes it possible to reduce the size of the heat radiating unit. In addition, because of its porosity, it also leads to weight reduction. As a matter of course, copper or aluminum metal fins can also be used as cooling fins.

The heat absorbing unit 30 is a heat exchanger provided outside the constant temperature bath in order to dissipate the heat of the heat pipe 11-13 and the Pelche element 50. Further, a pelche element 50 is provided inside the heat absorbing portion 30, and the heat of the heat pipes 11 and 12 is absorbed by the pelche element 50. In the example shown in FIG. 1, the endothermic portion 30 has a rectangular parallelepiped shape whose main surface is parallel to the yz plane and extends in the z-axis direction. The endothermic unit 30 has a structure in which a large number of aluminum fins, which are metals having high thermal conductivity, are laminated, for example. The material used for the endothermic portion 30 may be changed to other metals having high thermal conductivity such as copper, iron, and stainless steel instead of aluminum. The detailed configuration of the endothermic unit 30 will be described later with reference to FIG.

The heat exchange unit 40 is provided in a constant temperature bath and is a heat exchanger for maintaining a constant temperature in the constant temperature bath. In the example shown in FIG. 1, the heat exchange unit 40 has a rectangular parallelepiped shape whose main surface is parallel to the xy plane and extends in the y-axis direction. The heat exchange unit 40 has a structure in which a large number of aluminum fins, which are metals having high thermal conductivity, are laminated, for example. The material used for the heat exchange unit 40 may be changed to another metal having high thermal conductivity such as copper, iron, and stainless steel instead of aluminum.

As described above, the heat exchange portions 40 are filled with heat pipes 11 and 12 branched in parallel in the x-axis direction. As a result, the heat exchange area in which the heat exchange unit 40 and the heat pipes 11 and 12 are in contact with each other can be increased, so that the efficiency of heat exchange is improved. The heat pipes 11 and 12 penetrating the heat exchange unit 40 may be single pipes. Further, in FIG. 1, in the heat exchange unit 40, a rectangular heat exchanger through which the heat pipe 11 penetrates and a rectangular heat exchanger through which the heat pipe 12 penetrates are parallel to the xy plane, respectively. It is provided separately so that it becomes. The heat exchange unit 40 may be provided integrally instead of separately.

Similarly, heat pipes 11-13 branched side by side in the y-axis direction penetrate inside the heat radiating section 20 and the heat absorbing section 30. As a result, the heat exchange areas of the heat pipe 11-13 and the heat radiating unit 20, and the heat exchange areas of the heat pipe 11-13 and the heat absorbing unit 30 can be increased, so that the efficiency of heat exchange is improved. Improving the efficiency of heat exchange means improving the cooling efficiency. The heat pipes 11-13 penetrating the heat radiating portion 20 and the heat absorbing portion 30 may be single pipes.

Further, in FIG. 1, the heat radiating portion 20 is penetrated by a rectangular heat exchanger through which the heat pipe 11 penetrates, a rectangular heat exchanger through which the heat pipe 13 penetrates, and a heat pipe 12 penetrate. The square-shaped heat exchangers are provided separately on a plane from each other. The heat exchangers are not adhered to each other and have a space. As a result, the surface area outside the constant temperature bath that comes into contact with the outside air increases, and the cooling efficiency can be improved. The heat radiating unit 20 may be provided integrally instead of separately.

Similarly, regarding the heat absorbing portion 30, a rectangular heat exchanger through which the heat pipe 11 penetrates, a rectangular heat exchanger through which the heat pipe 13 penetrates, and a rectangular shape through which the heat pipe 12 penetrates. The heat exchangers of the above are separately provided in parallel with each other. The endothermic unit 30 may be provided integrally instead of separately.

Further, since the heat pipes 11 and 12 can be designed with one circulation path each, the refrigerant can be filled and the vacuum can be drawn at the same time. Furthermore, the structure having this circulation path (loop structure) makes it possible to make the flow path including the state transition between the liquid phase and the gas phase unidirectional, so that the pressure loss can be reduced.

Next, the structure of the endothermic unit 30 will be described in detail with reference to FIG. FIG. 2 is a schematic cross-sectional view showing the configuration of the heat pipe constant temperature bath 1 according to the first embodiment. As shown in FIG. 2, in the heat absorbing portion 30, a pair of rectangular bodies having a main surface parallel to the yz plane are located between the heat pipe 11 and the heat pipe 13 and between the heat pipe 12 and the heat pipe 13. The Pelche element 50 is arranged.

The surface on which the Pelche element 50 faces the heat pipe 11 is an endothermic surface 51 that absorbs heat from the heat pipe 11. Similarly, the surface on which the Pelche element 50 faces the heat pipe 12 is the endothermic surface 52 that absorbs the heat of the heat pipe 12. That is, each of the heat absorbing surfaces 51 and 52 of the pair of Pelche elements 50 is provided so as to be in contact with the heat pipes 11 and 12, respectively.

On the other hand, the surface of the Pelche element 50 facing the heat pipe 13 is the heat dissipation surface 53 that dissipates the heat of the heat pipe 11. Similarly, the surface of the Pelche element 50 facing the heat pipe 13 is the heat dissipation surface 54 that dissipates the heat of the heat pipe 12. That is, each of the heat radiating surfaces 53 and 54 of the pair of Pelche elements 50 is provided so as to be in contact with the heat pipe 13.

With such a configuration, the heat absorbing surfaces 51 and 52 of the Pelche element 50 absorb the heat of the heat pipes 11 and 12, and the heat radiating surfaces 53 and 54 of the Pelche element 50 dissipate the heat to the heat pipe 13. The released heat is transferred to the heat radiating unit 20 via the heat pipe 13 to cool the Pelche element 50.

Here, with reference to FIGS. 1 and 2, a mechanism for controlling the constant temperature of the heat pipe constant temperature bath 1 and a mechanism for increasing the cooling efficiency of the Pelche element 50 will be described. In the heat pipe constant temperature bath 1 of the present invention, the heat pipe 11-13 is filled with a refrigerant. The refrigerant in the heat pipes 11 and 12 having a loop structure circulates between the inside of the constant temperature bath and the outside of the constant temperature bath.

The environmental load can be reduced by using a non-fluorocarbon refrigerant having GWP (Global Warming Potential) = 1 in consideration of environmental friendliness. The refrigerant can be selected according to the control temperature range of the constant temperature bath. As the refrigerant, water may be used, or a refrigerant having a boiling point lower than that of water such as alcohol may be used. When a refrigerant having a boiling point lower than that of water is used, it is more likely to evaporate even when the ambient temperature is lower than that of water. Therefore, the efficiency of lowering the temperature to the ambient temperature or lower is improved, and the control temperature range of the constant temperature bath can be expanded.

In the heat exchange unit 40 of FIG. 1, the heat of the constant temperature bath is transferred to the refrigerants in the heat pipes 11 and 12, respectively. The refrigerant that has received heat becomes a gas phase and moves to the heat radiating section 20 outside the constant temperature bath through the heat pipes 11 and 12.

In FIG. 2, the moving direction of the refrigerant is indicated by an arrow in the heat radiating unit 20. The refrigerant that has received heat in the heat exchange unit 40 becomes the gas phase, and the heat pipes 11 and 12 move in the negative z-axis direction (direction of the arrow). At this time, the heat radiating unit 20 is cooled by the ambient temperature.

After that, the refrigerant moves to the endothermic portion 30 on the negative direction side of the z-axis, and is endothermic by the endothermic surfaces 51 and 52 of the Pelche element 50. As a result, it is possible to cool the temperature below the temperature already cooled by the heat radiating unit 20. The endothermic refrigerant becomes a liquid phase and returns (circulates) from outside the constant temperature bath to the inside of the constant temperature bath. Although not shown, with respect to cooling the Pelche element 50, an appropriate current is applied to the Pelche element 50 according to the temperature to be cooled. At the time when the refrigerant becomes a liquid phase, there is a possibility of either the heat dissipation unit 20 or the endothermic unit 30 depending on the type of the refrigerant and the ambient temperature.

On the other hand, the heat absorbed by the heat absorbing unit 30 is transferred to the refrigerant in the heat pipe 13 through the heat radiating surfaces 53 and 54 of the Pelche element 50. The refrigerant in the heated heat pipe 13 becomes a gas phase, moves to the heat radiating portion 20 on the positive direction side of the z-axis, and is cooled by the ambient temperature. The cooled refrigerant changes its state to the liquid phase and recirculates in the negative direction of the z-axis again (FIG. 2, up and down arrows in the heat pipe 13).

The mechanism of constant temperature control of the heat pipe constant temperature bath 1 will be described. First, the constant temperature bath is cooled to the extent possible by the heat pipes 11 and 12 according to the ambient temperature. When controlling to a temperature range equal to or lower than the cooled temperature, the Pelche element 50 is controlled and the heat absorbing unit 30 is used for cooling. By performing this two-step control, the temperature of the constant temperature bath can be controlled below the ambient temperature, and the constant temperature performance below the ambient temperature can be obtained. With such a configuration, the temperature can be controlled efficiently. Since the endothermic surface and the heat radiating surface of the Pelche element 50 are reversed by applying a reverse current, temperature control such as heating by the endothermic unit 30 is possible as well as cooling.

As described above, by cooling the Pelche element 50 with the heat pipe 13, the cooling efficiency of the Pelche element 50 can be improved. That is, it is possible to provide a heat pipe constant temperature bath having excellent cooling efficiency of the Pelche element 50.

If the cooling efficiency of the Pelche element 50 can be increased, it is not necessary to separately cool the Pelche element 50 by using another cooling device, so that the power consumption for using the cooling device can be reduced. Further, if the cooling efficiency of the Pelche element 50 can be increased, the amount of the Pelche element 50 used for predetermined temperature control can also be reduced, so that the power consumption for using the Pelche element 50 can be reduced. can. From the above, the power consumption can be reduced by using the heat pipe constant temperature bath 1 according to the present invention. By reducing power consumption, it is possible to contribute to the reduction of CO2 emissions.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit.

1 Heat pipe constant temperature bath 11, 12, 13 Heat pipe 20 Heat dissipation part 30 Endothermic part 40 Heat exchange part 50 Pelche element 51, 52 Heat absorption surface 53, 54 Heat dissipation surface

Claims (1)

The first and second heat pipes provided in the constant temperature bath and outside the constant temperature bath and in which the refrigerant circulates, and
A heat radiating unit that dissipates heat from the first and second heat pipes outside the constant temperature bath.
A heat exchange unit provided in the constant temperature bath and transmitting heat in the constant temperature bath to the first and second heat pipes.
A heat absorbing section outside the constant temperature bath, which is provided between the heat exchange section and the heat radiating section and absorbs heat from the first and second heat pipes using a Pelche element.
A third heat pipe, which is provided over the heat radiating portion and the heat absorbing portion and transfers the heat released from the Pelche element to the heat radiating portion, is provided.
The third heat pipe is arranged between the first and second heat pipes.
The Pelche element is a pair of Pelche elements provided in the heat absorbing portion between the third heat pipe and the first and second heat pipes, respectively.
Each of the endothermic surfaces of the pair of Pelche elements is provided so as to be in contact with the first and second heat pipes.
Each of the heat dissipation surfaces of the pair of Pelche elements is provided so as to be in contact with the third heat pipe.
The heat released from the heat radiating surface of the pair of Pelche elements is transferred to the heat radiating portion via the third heat pipe.
Heat pipe constant temperature bath.

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