A cooling and anti-condensation device for distributed photovoltaic panels

Abstract

The present invention relates to a cooling and anti-condensation device for distributed photovoltaic panels. The device includes a photovoltaic panel body, a heat-conducting film, a heat-insulating wall, a heat-insulating shell, a liquid heat-conducting material, a phase change element, etc. The photovoltaic panel cooling and anti-condensation device provided by the present invention can reduce the surface temperature of the photovoltaic panel during the day, so that the photovoltaic panel is at the most suitable working temperature, improve the power generation efficiency, and reduce the impact of high temperature on the life of the photovoltaic panel; in addition, the device can use the energy stored during the day to heat the photovoltaic panel at night, inhibit condensation on the surface of the photovoltaic panel, thereby reducing the deposition and bonding of dust on the surface of the photovoltaic panel, and reducing the impact of dust pollution on photovoltaic power generation.

Description

Technical Field

[0001] The present invention belongs to the technical field of solar photovoltaic panels, and more specifically, relates to a cooling and anti-condensation device for distributed photovoltaic panels. Background Art

[0002] Today, the world is facing energy shortage and serious environmental pollution. As a continuous, environmentally friendly and safe energy source, solar energy is the most important part of the new energy field and has broad development prospects. At present, photovoltaic power generation is widely used as the core technology in the field of solar energy application. However, when photovoltaic panels are working during the day, the high ambient temperature and strong solar radiation make the surface temperature of photovoltaic panels too high, which not only reduces the efficiency of photovoltaic power generation, but also causes thermal stress on the components and shortens the life of photovoltaic panels. In addition, due to the surface radiation cooling effect, the surface temperature of photovoltaic panels will be lower than the dew point temperature in the early morning, and condensation will occur, which will aggravate the dust pollution on the surface of photovoltaic panels and further reduce the surface transmittance and power generation efficiency of photovoltaic panels. Therefore, in order to improve the efficiency of photovoltaic power generation, it is of great significance to study the cooling and anti-condensation of photovoltaic panels.

[0003] At present, the cooling of photovoltaic panels mainly adopts spray cooling, heat exchanger heat exchange (for example, a patent for a solar photovoltaic panel cooling system using isopentane as a working fluid), etc., which consumes a lot of electricity and a lot of heat is lost during use, which cannot be effectively converted and utilized. On the other hand, such devices take up a lot of space, generate a lot of noise during use, are expensive and easy to damage, and are difficult to develop in small photovoltaic power generation equipment. Therefore, it is of great significance to develop a simple, efficient and stable cooling and anti-condensation device for photovoltaic panels. Summary of the invention

[0004] The purpose of the present invention is to provide a cooling and anti-condensation device for distributed photovoltaic panels in view of the defects or deficiencies of the prior art. The cooling and anti-condensation device for photovoltaic panels provided by the present invention can reduce the surface temperature of photovoltaic panels during the day, so that photovoltaic panels are at the most suitable working temperature, improve power generation efficiency, and reduce the impact of high temperature on the life of photovoltaic panels; at the same time, the energy stored during the day is used to heat the photovoltaic panels at night to inhibit condensation on the surface of the photovoltaic panels, thereby reducing the deposition and bonding of dust on the surface of the photovoltaic panels, and reducing the impact of dust pollution on photovoltaic power generation. While reducing the surface temperature of photovoltaic panels and inhibiting the formation of dew points, the device has certain advantages over pump-type heat exchangers in terms of noise, energy consumption, cost, space, environmental protection, etc., and can be widely promoted on small photovoltaic power generation equipment in areas with large temperature differences and strong winds and sand.

[0005] In order to achieve the purpose of the above invention, the present invention adopts the following technical solutions:

[0006] A cooling and anti-condensation device for distributed photovoltaic panels, comprising a heat-conducting film and a heat-insulating wall stacked in sequence on a photovoltaic panel body; the heat-conducting film and the heat-insulating wall are wrapped in the photovoltaic panel body and a heat-insulating shell, and liquid heat-conducting material is filled between the heat-insulating wall and the heat-insulating shell; a temperature control switch for controlling whether the heat-conducting film and the liquid heat-conducting material are in contact or not is provided on the heat-insulating wall; phase change elements are distributed in the liquid heat-conducting material; the phase change element comprises a heat-conducting shell layer and a phase change material core.

[0007] The present invention provides a cooling and anti-condensation device for distributed photovoltaic panels. The device uses a thermal conductive film, an insulation wall, a temperature control switch, a liquid thermal conductive material and a phase change element to achieve better cooling and anti-condensation of distributed photovoltaic panels. It does not require a heat exchanger and has the advantages of low noise, low energy consumption, low cost, small space occupation and environmental protection. It can be widely promoted on small photovoltaic power generation equipment in areas with large temperature differences and strong winds and sand. The specific process is as follows:

[0008] In the device, the heat insulation wall and the temperature control switch realize whether the heat is transferred. The phase change element can realize heat conduction through the heat-conducting shell, the liquid heat-conducting material, and the heat-conducting film in contact with the photovoltaic panel body, and regulate the surface temperature of the photovoltaic panel to achieve cooling or anti-condensation: during the day (or when needed), the photovoltaic panel absorbs sunlight, the surface temperature rises, and the temperature control switch is controlled to make the heat-conducting film and the liquid heat-conducting material contact, and the heat is transferred to the core of the phase change material through the heat-conducting film, the liquid heat-conducting material, and the heat-conducting shell. At this time, the core of the phase change material undergoes phase change to absorb heat, and the surface temperature of the photovoltaic panel is controlled at a suitable lower temperature; at night (or when needed), the surface temperature of the photovoltaic panel drops, and the temperature control switch is controlled to make the heat-conducting film and the liquid heat-conducting material contact, and the phase change ball releases heat, and the heat is transferred to the surface of the photovoltaic panel again through the heat-conducting shell, the liquid heat-conducting material, and the heat-conducting film, so that the surface temperature of the photovoltaic panel reaches above the dew point. When heat transfer is not required, the temperature control switch is controlled so that the heat-conducting film and the liquid heat-conducting material do not contact.

[0009] Preferably, the thermally conductive film is a copper film or an aluminum film; the copper film and the aluminum film are materials with good thermal conductivity and have good thermal conductive effects.

[0010] Preferably, the material of the insulation wall is foam plastic or aerogel insulation film; foam plastic and aerogel insulation film have poor thermal conductivity and have good insulation effect.

[0011] Preferably, the heat-insulating wall is provided with an opening, and the temperature control switch is arranged in the opening.

[0012] Preferably, the liquid heat-conducting material is heat-conducting silicone oil.

[0013] The melting point of the phase change material can be selected according to the temperature of the photovoltaic panel surface, and the melting point of the material is required to be between the highest and lowest temperatures on the photovoltaic panel surface. When the photovoltaic panel surface needs to be cooled, the melting point of the phase change material is lower than the temperature of the photovoltaic panel surface. When the photovoltaic panel surface needs to resist condensation, the melting point of the phase change material is higher than the temperature of the photovoltaic panel surface.

[0014] Preferably, the melting point of the phase change material is 10-30° C. Within this range, it can be applied to cooling and anti-condensation treatment of photovoltaic panels in various places.

[0015] Preferably, the phase change element is spherical.

[0016] Preferably, the phase change material core is paraffin.

[0017] Preferably, the heat-conducting shell layer is a metal shell layer, such as a copper shell layer or an aluminum shell layer.

[0018] Preferably, fins are provided between the heat-conducting shell and the phase-change material, and the fins can realize heat transfer between the heat-conducting shell and the core of the phase-change material.

[0019] More preferably, the fins are fixed to the inner surface of the heat-conducting shell.

[0020] More preferably, there are multiple fins, which are evenly embedded and arranged in the heat-conducting shell, and adjacent fins are in contact with each other.

[0021] Preferably, the temperature control switch comprises a heat-conducting column and an electrically connected temperature detector, a temperature controller and a sliding switch;

[0022] One side of the sliding switch is in contact with the heat-conducting film, and the cross section of the other side includes a heat-conducting surface and a heat-insulating surface;

[0023] The temperature detector is arranged on the photovoltaic panel body and is used to obtain the temperature signal on the surface of the photovoltaic panel body;

[0024] The temperature controller receives the temperature signal of the photovoltaic panel body and converts it into a sliding signal for controlling the sliding of the sliding switch;

[0025] The slide switch receives a slide signal and slides so that only the heat-conducting surface or only the heat-insulating surface contacts the heat-conducting column;

[0026] The heat-conducting column is in contact with the liquid heat-conducting material.

[0027] By adjusting the sliding of the sliding switch, the heat-conducting surface / heat-insulating surface can be adjusted to contact with the heat-conducting column and the liquid heat-conducting material in turn, thereby realizing or blocking the transfer of heat.

[0028] Preferably, the temperature control switch further comprises a fixing frame fixed in the isolation wall for fixing the heat-conducting column.

[0029] Preferably, the heat insulating shell is fixed to the photovoltaic panel by a limiting plate.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The cooling and anti-condensation device for distributed photovoltaic panels provided by the present invention can reduce the surface temperature of photovoltaic panels during the day, so that photovoltaic panels can operate at the most suitable temperature, improve power generation efficiency, and reduce the impact of high temperature on the life of photovoltaic panels; at the same time, the energy stored during the day is used to heat the photovoltaic panels at night to inhibit condensation on the surface of the photovoltaic panels, thereby reducing the deposition and bonding of dust on the surface of the photovoltaic panels, and reducing the impact of dust pollution on photovoltaic power generation. While reducing the surface temperature of photovoltaic panels and inhibiting surface condensation, the device has certain advantages over pump-type heat exchangers in terms of noise, energy consumption, cost, space, environmental protection, etc., and can be widely promoted on small photovoltaic power generation equipment in areas with large temperature differences and strong winds and sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the cooling and anti-condensation device for distributed photovoltaic panels;

[0033] Figure 2 is a schematic diagram of a temperature control switch;

[0034] Figure 3 It is a schematic diagram of the structure of the insulation wall;

[0035] Figure 4 It is a schematic diagram of the structure of the phase change element;

[0036] Figure 5 It is a schematic diagram of the structure of the heat insulation package in the cooling and anti-condensation device for distributed photovoltaic panels;

[0037] Among them, 1-photovoltaic panel body; 2-thermal conductive film; 3-temperature control switch, 31-thermal conductive column, 32-temperature detector, 33-temperature controller, 34-sliding switch, 341-thermal conductive surface, 342-thermal insulation surface, 35-fixed frame; 4-thermal insulation wall, 401-opening; 5-liquid thermal conductive material; 6-phase change element, 61-thermal conductive shell, 62-phase change material core; 7-thermal insulation shell. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] It should be noted that when an element is referred to as being "located on" or "mounted on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "upper", "lower", "left", "right" and similar expressions used in the present invention are for illustrative purposes only and do not represent the only implementation method.

[0040] Example 1

[0041] This embodiment provides a cooling and anti-condensation device for distributed photovoltaic panels, such as Figure 1 , including a heat-conducting film 2 and a heat-insulating wall 4 stacked on a photovoltaic panel body 1 in sequence. Figure 5 The thermal conductive film 2 and the thermal insulation wall 4 are wrapped in the photovoltaic panel body 1 and the thermal insulation shell 7, and the thermal insulation wall 4 and the thermal insulation shell 7 are filled with liquid thermal conductive material 5; the thermal insulation wall 4 is provided with a temperature control switch 3 for controlling whether the thermal conductive film 2 and the liquid thermal conductive material 5 are in contact or not; the liquid thermal conductive material 5 is distributed with a phase change element 6; the phase change element 6 includes a thermal conductive shell layer 61 and a phase change material core 62.

[0042] Specifically, the thermally conductive film 2 is a copper film, the thermal insulation wall 4 is made of foam plastic, and the liquid thermally conductive material 5 is thermally conductive silicone oil; the phase change element 6 is spherical (i.e., a phase change ball), including a spherical thermally conductive shell 61 and a phase change material 62, and the phase change material 62 is paraffin; the thermally conductive shell 61 is a metal shell (such as a copper or aluminum metal shell).

[0043] The cooling and anti-condensation device for distributed photovoltaic panels provided in this embodiment realizes cooling and anti-condensation of photovoltaic panels through the following process: during the day, the photovoltaic panel absorbs sunlight, the surface temperature rises, the temperature control switch makes the thermal conductive film contact with the liquid thermal conductive material, and the heat is transferred to the phase change material through the thermal conductive film, the liquid thermal conductive material, and the thermal conductive shell. At this time, the phase change material (paraffin) undergoes a phase change from solid to liquid to absorb heat, and the surface temperature of the photovoltaic panel is controlled at a suitable lower temperature; at night, the surface temperature of the photovoltaic panel drops, the temperature control switch is controlled to make the thermal conductive film contact with the liquid thermal conductive material, and the liquid phase change material (paraffin) changes to solid to release heat, and the heat is transferred to the surface of the photovoltaic panel again through the thermal conductive shell, the liquid thermal conductive material, and the thermal conductive film, so that the surface temperature of the photovoltaic panel reaches above the dew point. When heat transfer is not required, the temperature control switch makes the thermal conductive film and the liquid thermal conductive material not contact.

[0044] Example 2

[0045] This embodiment provides a cooling and anti-condensation device for distributed photovoltaic panels, including a heat-conducting film 2 and a heat-insulating wall 4 stacked on a photovoltaic panel body 1. Figure 5The thermal conductive film 2 and the thermal insulation wall 4 are wrapped in the photovoltaic panel body 1 and the thermal insulation shell 7, and the thermal insulation wall 4 and the thermal insulation shell 7 are filled with liquid thermal conductive material 5; the thermal insulation wall 4 is provided with a temperature control switch 3 for controlling whether the thermal conductive film 2 and the liquid thermal conductive material 5 are in contact or not; the liquid thermal conductive material 5 is distributed with a phase change element 6; the phase change element 6 includes a thermal conductive shell layer 61 and a phase change material core 62.

[0046] Specifically, the thermally conductive film 2 is a copper film, the thermal insulation wall 4 is made of foam plastic, and the liquid thermally conductive material 5 is thermally conductive silicone oil; the phase change element 6 is spherical (i.e., a phase change ball), including a spherical thermally conductive shell 61 and a phase change material 62, and the phase change material 62 is paraffin; the thermally conductive shell 61 is a metal shell (such as a copper or aluminum metal shell).

[0047] In addition, it also includes:

[0048] The heat insulation wall 4 is provided with a circular opening 41. Figure 2 and Figure 3 The temperature control switch 3 includes a semi-cylindrical heat-conducting column 31 (for example, an aluminum column) and an electrically connected temperature detector 32, a temperature controller 33 and a sliding switch 34. The sliding switch 34 is a cylinder matching the opening 41 and is embedded in the opening 41. One end of the sliding switch 34 contacts the heat-conducting film 2, and the cross-section of the other end is circular, including a matching semi-circular heat-conducting surface 341 and a semi-circular heat-insulating surface 342. The heat-conducting surface 341 or the semi-circular heat-insulating surface 342 contacts the heat-conducting column 31. The temperature detector 32 is arranged on the photovoltaic panel body 1 to obtain the temperature signal of the surface of the photovoltaic panel body 1; the temperature controller 33 receives the temperature signal of the photovoltaic panel body 1 and converts it into a sliding signal for controlling the sliding of the sliding switch 34; the sliding switch 34 receives the sliding signal and slides (rotates 180°) so that only the heat-conducting surface 341 or only the heat-insulating surface 342 contacts one end of the heat-conducting column 31; the other end of the heat-conducting column 31 contacts the liquid heat-conducting material 5.

[0049] In addition, the temperature control switch 3 also includes a fixing frame 35 (such as an aluminum frame) fixed in the isolation wall, and the fixing frame 35 is provided with a screw hole (35). The fixing frame 35 and the heat-conducting column 31 are fixed by using the screw hole 35 and a fastener matching the screw hole.

[0050] In this embodiment, the cooling process is as follows: the temperature detector detects the surface temperature of the photovoltaic panel body and transmits the temperature signal to the temperature controller, the temperature controller receives the temperature signal of the photovoltaic panel body, when the surface temperature of the photovoltaic panel body is higher than a preset value, the temperature controller is triggered to send a sliding signal to control the sliding of the sliding switch, the sliding switch receives the sliding signal and slides (rotates 180°) so that only the heat conductive surface is in contact with one end of the heat conductive column, thereby realizing that heat is transferred from the surface of the photovoltaic panel body through the heat conductive film, the heat conductive surface, the heat conductive column, and the liquid heat conductive material to the core of the phase change material, so that the core of the phase change material undergoes a phase change reaction, from solid to liquid, absorbs heat, and realizes the reduction of the temperature of the photovoltaic panel body.

[0051] The anti-condensation process is as follows: the temperature detector detects the surface temperature of the photovoltaic panel body and transmits the temperature signal to the temperature controller. The temperature controller receives the temperature signal of the photovoltaic panel body. When the surface temperature of the photovoltaic panel body is lower than a preset value, the temperature controller is triggered to send a sliding signal to control the sliding of the sliding switch. The sliding switch receives the sliding signal and slides (rotates 180°) so that only the heat conductive surface is in contact with one end of the heat conductive column, thereby realizing the heat of the phase change material from the liquid heat conductive material, the heat conductive column, the heat conductive surface, and the heat conductive film to the surface of the photovoltaic panel body, thereby increasing the temperature of the photovoltaic panel body and achieving the anti-condensation effect.

[0052] When the temperature controller is not triggered, the heat-insulating surface contacts one end of the heat-conducting column, and the photovoltaic panel body and the phase change material core are separated by the heat-insulating wall, and no heat is transferred.

[0053] Example 3

[0054] The present invention provides a cooling and anti-condensation device for distributed photovoltaic panels, comprising a heat-conducting film 2 and a heat-insulating wall 4 sequentially stacked on a photovoltaic panel body 1. Figure 5 The thermal conductive film 2 and the thermal insulation wall 4 are wrapped in the photovoltaic panel body 1 and the thermal insulation shell 7, and the thermal insulation wall 4 and the thermal insulation shell 7 are filled with liquid thermal conductive material 5; the thermal insulation wall 4 is provided with a temperature control switch 3 for controlling whether the thermal conductive film 2 and the liquid thermal conductive material 5 are in contact or not; the liquid thermal conductive material 5 is distributed with a phase change element 6; the phase change element 6 includes a thermal conductive shell layer 61 and a phase change material core 62.

[0055] Specifically, the thermally conductive film 2 is a copper film, the thermal insulation wall 4 is made of foam plastic, and the liquid thermally conductive material 5 is thermally conductive silicone oil; the phase change element 6 is spherical (i.e., a phase change ball), including a spherical thermally conductive shell 61 and a phase change material 62, and the phase change material 62 is paraffin; the thermally conductive shell 61 is a metal shell (such as a copper or aluminum metal shell).

[0056] The heat insulation wall 4 is provided with a circular opening 41. Figure 2 and Figure 3The temperature control switch 3 includes a semi-cylindrical heat-conducting column 31 (for example, an aluminum column) and an electrically connected temperature detector 32, a temperature controller 33 and a sliding switch 34. The sliding switch 34 is a cylinder matching the opening 41 and is embedded in the opening 41. One end of the sliding switch 34 contacts the heat-conducting film 2, and the cross-section of the other end is circular, including a matching semi-circular heat-conducting surface 341 and a semi-circular heat-insulating surface 342. The heat-conducting surface 341 or the semi-circular heat-insulating surface 342 contacts the heat-conducting column 31. The temperature detector 32 is arranged on the photovoltaic panel body 1 to obtain the temperature signal of the surface of the photovoltaic panel body 1; the temperature controller 33 receives the temperature signal of the photovoltaic panel body 1 and converts it into a sliding signal for controlling the sliding of the sliding switch 34; the sliding switch 34 receives the sliding signal and slides (rotates 180°) so that only the heat-conducting surface 341 or only the heat-insulating surface 342 contacts one end of the heat-conducting column 31; the other end of the heat-conducting column 31 contacts the liquid heat-conducting material 5.

[0057] In addition, the temperature control switch 3 also includes a fixing frame 35 (such as an aluminum frame) fixed in the isolation wall, and the fixing frame 35 is provided with a screw hole (35). The fixing frame 35 and the heat-conducting column 31 are fixed by using the screw hole 35 and a fastener matching the screw hole.

[0058] In addition, it also includes: fins (63) fixedly mounted on the inner surface of the heat-conducting shell 61. Figure 4 There are a plurality of fins (63), which are evenly embedded and arranged in the heat-conducting shell 61, and adjacent fins (63) are in contact with each other.

[0059] The design of the fins can better achieve heat transfer between the heat-conducting shell 61 and the phase change material 62 .

[0060] The cooling process and anti-condensation process of this embodiment are basically the same as those of Embodiment 2.

[0061] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A cooling and anti-condensation device for distributed photovoltaic panels, characterized in that: The invention comprises a heat-conducting film (2) and a heat-insulating wall (4) which are sequentially stacked on a photovoltaic panel body (1); the heat-conducting film (2) and the heat-insulating wall (4) are wrapped in the photovoltaic panel body (1) and a heat-insulating shell (7); a liquid heat-conducting material (5) is filled between the heat-insulating wall (4) and the heat-insulating shell (7); a temperature control switch (3) for controlling whether the heat-conducting film (2) and the liquid heat-conducting material (5) are in contact or not is provided on the heat-insulating wall (4); a phase change element (6) is distributed in the liquid heat-conducting material (5); and the phase change element (6) comprises a heat-conducting shell (61) and a phase change material core (62).

2. The cooling and anti-condensation device for distributed photovoltaic panels according to claim 1, characterized in that: The heat-conducting film (2) is a copper film or an aluminum film.

3. The cooling and anti-condensation device for distributed photovoltaic panels according to claim 1, characterized in that: The material of the thermal insulation wall (4) is foam plastic or aerogel thermal insulation film.

4. The cooling and anti-condensation device for distributed photovoltaic panels according to claim 1, characterized in that: The heat insulation wall (4) is provided with an opening (41), and the temperature control switch (3) is arranged in the opening (41).

5. The cooling and anti-condensation device for distributed photovoltaic panels according to claim 1, characterized in that: The liquid heat-conducting material (5) is heat-conducting silicone oil; the melting point of the phase change material core (62) is 10-30°C.

6. The cooling and anti-condensation device for distributed photovoltaic panels according to claim 1, characterized in that: The phase change element (6) is spherical.

7. The cooling and anti-condensation device for distributed photovoltaic panels according to claim 1, characterized in that: The phase change material core (62) is paraffin; and the heat conductive shell layer (61) is a metal shell layer.

8. The cooling and anti-condensation device for distributed photovoltaic panels according to claim 1, characterized in that: Fins (63) are provided between the heat-conducting shell layer and the phase-change material core.

9. The cooling and anti-condensation device for distributed photovoltaic panels according to claim 1, characterized in that: The temperature control switch (3) comprises a heat-conducting column (31) and an electrically connected temperature detector (32), a temperature controller (33) and a sliding switch (34); One side surface of the sliding switch (34) contacts the heat-conducting film (2), and the cross-section of the other side surface includes a heat-conducting surface (341) and a heat-insulating surface (342); The temperature detector (32) is arranged on the photovoltaic panel body (1) and is used to obtain a temperature signal on the surface of the photovoltaic panel body (1); The temperature controller (33) receives a temperature signal of the photovoltaic panel body (1) and converts it into a sliding signal for controlling the sliding of the sliding switch (34); The sliding switch (34) receives a sliding signal and slides so that only the heat-conducting surface (341) or only the heat-insulating surface (342) contacts the heat-conducting column (31); The heat-conducting column (31) is in contact with the liquid heat-conducting material (5).

10. The cooling and anti-condensation device for distributed photovoltaic panels according to claim 9, characterized in that: The heat-conducting surface (341) and the heat-insulating surface (342) are both semicircular and are combined to form a circle; The heat-conducting column (31) is a semi-cylinder that matches the heat-conducting surface (341) and the heat-insulating surface (342), one end of which is in contact with the liquid heat-conducting material (5), and the other end of which is in contact with the heat-conducting surface (341) or the heat-insulating surface (342); The temperature control switch (3) also includes a fixing frame (35) fixed in the isolation wall and used for fixing the heat-conducting column (31).

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