JPH04174269A - Electronic refrigerator - Google Patents

Abstract

PURPOSE:To largely improve a cooling efficiency by disposing an indoor side thermosiphon so that its heat radiator is disposed at an uppermost side of the thermosiphon and its heat absorber is disposed at a lowermost side, and disposing an outdoor side thermosiphon so that its heat absorber is disposed at the lowermost side and its heat radiator is disposed at the uppermost side. CONSTITUTION:An indoor side thermosiphon 9 is disposed so that its heat radiator is disposed at the uppermost side of the thermosiphon 9 and its heat absorber 9c is disposed at the lowermost side. On the other hand, an outdoor side thermosiphon 10 is disposed so that its heat absorber is disposed at the lowermost side of the thermosiphon 10 and its heat radiator 10c is disposed at the uppermost side. Refrigerant tanks 9a, 10a of the thermosiphons 9, 10 are formed substantially in the same flat box shape as that of a thermoelectric element 8, and are brought into close contact with the heat absorbing surface 8a and the heat radiating surface 8b of the element 8 as the heat radiator and the heat absorber. Accordingly, heat transfer between the thermosiphons 9, 10 and the element 8 can be directly efficiently performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an electronic refrigerator using a thermoelectric element as a cold source.

(Prior Art) In a conventional electronic refrigerator, as shown in, for example, Japanese Utility Model Application Publication No. 1-109771, a thermoelectric element is embedded in the back insulating wall of the refrigerator body, and the heat absorption surface of the thermoelectric element is used as a heat absorbing surface of the refrigerator. On the inside, the heat radiating surface faces the outside of the refrigerator, and aluminum heat exchangers are brought into contact with the heat absorbing surface and the heat radiating surface of the thermoelectric element, respectively. In this case, when a current is applied to the thermoelectric element, the Beltier effect causes a phenomenon in which it absorbs heat from its heat-absorbing surface and releases it from its heat-radiating surface, thereby transferring the heat inside the refrigerator to the aluminum heat exchanger inside the refrigerator. The heat absorbed by the thermoelectric element is absorbed through the heat absorption surface of the thermoelectric element to cool the inside of the refrigerator, while the heat absorbed in the thermoelectric element is radiated to the outside of the refrigerator from the heat radiation surface through the aluminum heat exchanger on the outside of the refrigerator.

(Problem to be Solved by the Invention) By the way, in order to improve the cooling efficiency inside the refrigerator, the air inside the refrigerator - the aluminum heat exchanger inside the refrigerator - the thermoelectric element - the aluminum heat exchanger outside the refrigerator - the heat to the outside air. It is necessary to efficiently transfer heat, but in the conventional configuration, there is a limit to heat transfer through the aluminum heat exchanger, and the cooling efficiency is inevitably kept low.

In recent years, in order to improve this problem of cooling efficiency,
As shown in Publication No. 4-41871 (see Figure 10),
A thermoelectric element 32 is provided on the back of the refrigerator main body 31, and
An aluminum heat exchange block 33 is brought into close contact with the heat absorption surface of the thermoelectric element 32 on the inside of the refrigerator.
There is one in which a thermosiphon 34 is brought into close contact with the cooling chamber 35, and the cooling chamber 35 is cooled by the thermosiphon 34. The principle of heat transport by the thermosiphon 34 is that the refrigerant in the heat absorption part 34a on the inside of the refrigerator absorbs heat from the cooling chamber 35 and evaporates, so that the refrigerant with reduced density rises inside the thermosiphon 34. The refrigerant reaches the heat dissipation section 34b on the thermoelectric element 32 side, where it dissipates heat and liquefies again, so that the refrigerant, whose density has increased, descends inside the thermosiphon 34 due to gravity and reaches the heat absorption section 34a on the inside of the refrigerator. Heat is transported by repeating this process. Therefore, heat transport (i.e. refrigerant circulation) by the thermosiphon 34
In order to promote this, the position of one heat absorbing part 34a on the inside of the refrigerator, which is the part where the density of the refrigerant decreases, is lower than the position of the heat radiating part 34b, which is the part where the density of the refrigerant increases, and the height of the two is adjusted. It is necessary to reduce the difference (lift head).

However, in the one described in the above publication, the thermoelectric element 32
is arranged on the back of the refrigerator main body 31, and the heat absorption part 34a of the thermosiphon 34 is arranged from the upper part to the lower part of the side surface of the cooling chamber 35, so that the height of the lowest part of the heat absorption part 34H and the heat radiation part 34b is different. The disadvantage is that the difference (head) becomes too large, which impedes the circulation of the refrigerant (heat transport). Moreover, since the aluminum heat exchange block 33 is interposed in the heat transfer path from the heat radiation part 34b of the thermosiphon 34 to the heat absorption surface of the thermoelectric element 32, there is a limit to the heat transfer through the aluminum heat exchange block 33. This also causes poor cooling efficiency. Furthermore, since the heat radiation side of the thermoelectric element 32 is designed to radiate heat through the aluminum radiation fins 36 as in the past, heat cannot be actively radiated, which also causes poor cooling efficiency. .

The present invention has been made in consideration of such circumstances, and therefore, its purpose is to provide an electronic refrigerator that can significantly improve cooling efficiency.

[Structure of the Invention] (Means for Solving the Problems) The electronic refrigerator of the present invention uses a thermoelectric element as a cold heat source, in which the thermoelectric element is disposed on the ceiling of a cooling chamber, and the thermoelectric element absorbs heat. The refrigerant tank of the thermosiphon filled with refrigerant is brought into close contact with the surface and the heat radiation surface, and the refrigerant tank, which will become the heat radiation part, is at the top of the inside thermosiphon and the heat absorption part is at the bottom. The cooling chamber is cooled by its heat absorption part, while the outside thermosiphon is arranged so that the refrigerant tank, which becomes the heat absorption part, is at the bottom of the outside thermosiphon and the heat radiation part is at the top. The heat of the thermoelectric element is then radiated to the outside of the refrigerator by the heat radiating portion.

In this case, the heat absorbing part of the inside thermosyphon is arranged so as to be aligned with the back side of the inside plate of the ceiling insulation wall of the cooling room.
The inner plate may be used as a cooling surface.

Furthermore, at least one of the thermosiphons may have a configuration in which a plurality of refrigerant passages in and out of the refrigerant tank are provided in parallel.

(Function) When a thermoelectric element is energized, a phenomenon occurs in which heat is absorbed from the heat absorption surface due to the Beltier effect and released from the heat radiation surface, thereby changing the phase of the refrigerant in the thermosiphons on both sides and utilizing gravity. and self-heat circulation. As a result, the inside thermosiphon absorbs and cools the heat inside the cooling chamber in its heat absorption portion, and transports the heat absorbed from the cooling chamber to the heat absorption surface of the thermoelectric element by the circulation action of the refrigerant. and,
The heat absorbed in the thermoelectric element is transferred from its heat radiation surface to the refrigerant in the outside thermosiphon, and is radiated outside the refrigerator from the heat radiating part of the outside thermosiphon due to the circulation of this refrigerant. In this way, the circulation of the refrigerant can promote the transfer of heat from the cooling chamber to the outside of the refrigerator, making it possible to efficiently cool the cooling chamber.

In this case, the refrigerant tanks of the thermosiphons on both sides are in close contact with the heat absorption and heat radiation surfaces of the thermoelectric element as heat radiation and heat absorption parts, respectively, so the thermosiphon is Heat transfer between the siphon and the thermoelectric element takes place directly and efficiently.

In addition, the thermoelectric element is placed on the ceiling of the cooling room, and the inside thermosiphon is connected to its heat dissipation section (refrigerant tank).
The inside thermosiphon is placed at the top and the heat absorption part is at the bottom, while the outside thermosiphon is placed so that its heat absorption part (refrigerant tank) is at the bottom of the outside thermosiphon and the heat radiation part is at the top. This makes it an ideal thermosiphon arrangement where the part where the density of the refrigerant decreases (the heat absorption part) is lower than the part where the density of the refrigerant increases (the heat radiation part). In addition, gravity can be effectively utilized for the circulation of the refrigerant, and the height difference (lift head) between the two can be reduced, thereby promoting the circulation of the refrigerant within the thermosiphon.

In addition, the heat absorbing part (the part that functions as a cooler) of the inside thermosiphon can be placed on the ceiling of the cooling room, so the cooling effect allows the cold air in the cooling room to flow downward from the ceiling. It can efficiently cool every corner of the room.

In this case, the heat absorbing part of the inside thermosyphon is arranged so as to be aligned with the back side of the inside plate of the ceiling insulation wall of the cooling room.
If the inner plate is used as a cooling surface, there is no need to expose the thermosiphon inside the cooling chamber, the appearance of the inside of the cooling chamber can be improved, and the effective volume of the cooling chamber can be further expanded.

Furthermore, if at least one thermosiphon is configured to have a plurality of parallel paths for refrigerant going in and out of the refrigerant tank, the refrigerant circulation ability and hence the heat transport ability can be further improved.

(Example) Hereinafter, a first example of the present invention will be described based on FIGS. 1 and 2.

The refrigerator main body 1 is composed of a heat insulating wall 5 filled with a heat insulating material 4 between an outer box 2 and an inner box 3, and an internal space surrounded by the heat insulating wall 5 is defined as a cooling chamber 6.

The front side of this cooling chamber 6 is opened and closed by a door 7.

On the other hand, a thermoelectric element 8 is installed on the heat insulating wall 5 at the ceiling of the cooling room 6.
is buried, and the heat absorption surface 8a of this thermoelectric element 8 is directed toward the inside (lower side) of the refrigerator, and the heat radiation surface 8b is directed toward the outside (upper side) of the refrigerator. Closed-loop thermosiphons 9 and 10 filled with refrigerant are arranged on the heat absorption side (inside the refrigerator) and the heat radiation side (outside the refrigerator) of the thermoelectric element 8, respectively. Each of these thermosiphons 9.10 is equipped with a refrigerant tank 9a, 10a for exchanging heat with the thermoelectric element 8. Each of these refrigerant tanks 9a, 10a is formed into a flat box shape that is approximately the same as or larger than the thermoelectric element 8 (see FIG. 2).
The entire surface of the heat absorbing surface 8a and the heat dissipating surface 8b are in close contact with each other. By connecting both ends of the vibrators 9b and 10b to both the front and rear sides of each refrigerant tank 9a and 10a, closed-loop type thermosiphons 9 and 10 are constructed, and the heat absorption part 9c of the inside thermosiphon 9 is A large number of fins 11 are provided in the heat absorbing portion 9C exposed to the ceiling portion of the cooling chamber 6. On the other hand, the heat radiating part 10c of the outside thermosiphon 10 is projected outside the refrigerator, and the heat radiating part 10c also has a
A large number of fins 12 are provided.

In this case, the inside thermosiphon 9 is arranged so that its heat radiation part (refrigerant tank 9a) is at the top of the inside thermosiphon 9 and the heat absorption part 9C is at the bottom, and the heat absorption part 9C is placed in the cooling room 9. It is placed on the ceiling inside. On the other hand, the outside thermosiphon 10 is arranged such that its heat absorbing part (refrigerant tank 10a) is at the bottom of the outside thermosiphon 10 and the heat radiating part 10C is at the top.

In this embodiment, the pipes 9b and 10b constituting the thermosiphon 9.10 are thin refrigerant pipes with an inner diameter of about 3 to 10 IIm, which are commonly used in refrigerators, etc., to reduce costs. Even in this case, the thermosiphon 9,
10 is configured in a closed loop type, so even if the vibe 9
Even if b and 10b are thin, the circulation of the refrigerant (heat transport) is carried out smoothly.

Next, the operation of the above configuration will be explained.

When the thermoelectric element 8 is energized to start cooling, a phenomenon occurs in which heat is absorbed from the heat absorbing surface 8a of the thermoelectric element 8 and released from the heat dissipating surface 8b due to the Bertier effect, thereby causing the thermosiphons 9 on both sides to Heat is transported by natural circulation of the refrigerant in the refrigerant 10 due to phase change and the action of gravity. The principle of heat transport by this thermosiphon 9.10 is that the refrigerant in the heat absorption part 9c and the refrigerant tank 10a absorbs heat from the outside and evaporates, so that the refrigerant with reduced density flows inside the thermosiphon 9.10. Rise to heat dissipation part 9a, refrigerant tank IOC
At this point, the refrigerant radiates heat and liquefies again, and the density of the refrigerant increases due to gravity.
Heat is transported by repeating a cycle of descending through the refrigerant tank 10 and reaching the heat absorbing section 9c and the refrigerant tank 10a. Therefore, the inside thermosiphon 9 absorbs the heat inside the cooling chamber 6 in the heat absorption part 9C, cools the inside of the cooling chamber 6, and cools the inside of the cooling chamber 6.
The heat absorbed from within is transported to the heat absorption surface 8a of the thermoelectric element 8 by the circulating action of the refrigerant. Then, the heat absorbed in the thermoelectric element 8 is transferred from the heat dissipation surface 8b to the outside thermosiphon 1.
The refrigerant is transmitted to the refrigerant inside the refrigerator, and is radiated to the outside of the refrigerator from the heat radiating portion 10c of the outside thermosiphon 10 due to the circulation of this refrigerant. In this way, the transport of heat from inside the cooling chamber 6 to the outside of the cooling chamber 6 can be promoted by the refrigerant circulation effect using phase change and gravity, compared to the conventional structure (one that does not use a thermosiphon). It is possible to have a heat transport capacity of about 10 to 100 times, and it becomes possible to efficiently cool the inside of the cooling chamber 6.

In this case, the refrigerant tanks 9a, 10a of the thermosiphons 9, 10 on both sides are formed into a flat box shape that is approximately the same as or larger than the thermoelectric element 8, and the refrigerant tanks 9a,
10a are in close contact with the heat absorption surface 8a and the heat radiation surface 8b of the thermoelectric element 8 as a heat radiation part and a heat absorption part, respectively, so compared to the conventional aluminum heat exchange block, the thermosiphon 9.10 Heat transfer to and from the thermoelectric element 8 can be performed directly and efficiently.

By the way, heat transport by thermosiphon 9.10 is performed by naturally circulating the refrigerant using gravity, so in order to increase the heat transport efficiency (refrigerant circulation efficiency), it is necessary to use gravity. The important thing is how to use it effectively.

In this regard, in the embodiment described above, the thermoelectric element 8 is disposed on the ceiling of the cooling chamber 6, and the inside thermosiphon 9 has a heat dissipating part (refrigerant tank 9a).
The outside thermosiphon 10 is arranged so that its heat absorbing part (refrigerant tank 10a) is at the bottom of the outside thermosiphon 10 and the heat radiating part 10c is at the top. Because they are arranged so that the density of the refrigerant decreases (the heat absorption part 9c,
0a) is lower than the position of the parts where the refrigerant density increases (refrigerant tank 9a, heat dissipation part 10c), which is an ideal layout, and gravity is effectively used to smoothly circulate the refrigerant. can be set. Moreover, by adopting the above-mentioned arrangement form, it is possible to reduce the height difference (lift head) between the heat absorption part and the heat radiation part. natural circulation can be carried out extremely smoothly.

Moreover, since the heat absorbing part 9C (the part that functions as a cooler) of the inside thermosiphon 9 can be placed on the ceiling of the cooling chamber 6, the cooling effect of the heat absorbing part 9C of the inside thermosyphon 9 directs the cold air inside the cooling chamber 6 downward from the ceiling. The air flows to every corner of the cooling chamber 6 efficiently.

Due to the above-mentioned effects, the cooling efficiency within the cooling chamber 6 can be significantly improved, and the internal volume can also be expanded.

In the above embodiment, the thermosiphons 9 and 10 are configured in a closed loop type, so even if the pipes gb and 1ob are thin, the circulation of the refrigerant (heat transport) can be carried out smoothly, and sufficient heat can be generated. Transport efficiency can be ensured. In this case, the pipes 9b and 10 constituting the thermosiphon 9°10
In b, since it is possible to use a thin refrigerant pipe with an internal diameter of about 3 to 10 mm, which is generally used in refrigerators, etc., there is also the advantage that costs can be reduced.

On the other hand, FIGS. 3 to 5 show a second embodiment of the present invention, and in this second embodiment, the heat absorption part 13C of the thermosiphon 13 inside the refrigerator is not exposed inside the cooling chamber 6. It is arranged in a meandering manner along the back surface of the metal inner plate 14 of the heat insulating wall 5, and the inner plate 14 is used as a cooling surface, and has a structure similar to that of a so-called pipe-on-sheet type cooler. There is. The heat absorbing portion 13c is bonded to the inner plate 14 in order to improve heat transfer (adhesion) between the heat absorbing portion 13c and the inner plate 14. Note that the upper surface (inside plate 14) of the cooling chamber 6 is inclined by 1° or more so as to be slightly diagonally upward toward the door 7 side. One of the reasons for this is to prevent as much as possible the upward flow of the refrigerant whose density has decreased due to vaporization within the heat absorbing portion 13C. Another reason is that depending on the outside air conditions and load conditions, water droplets or dew may form on the lower surface of the inner plate 14, which is the cooling surface.
The design is designed so that the water droplets flow down to the back side without falling onto the food.

On the other hand, as shown in FIG. 5, the heat dissipation section 16C of the outside thermosiphon 16 is bent in a meandering manner to enlarge the contact area (heat exchange area) with the air. This heat radiation part 16
As in the first embodiment, a large number of fins 17 are provided to improve heat dissipation.

In this case, the heat radiation part 16C of the outside thermosiphon 16 is arranged in the ventilation duct 18 provided at the upper part of the refrigerator main body 1, and the electric fan 19 is located behind the heat radiation part 16c.
is provided. During the cooling operation (while the thermoelectric element 8 is energized), the electric fan 19 rotates to send cooling air to the heat radiation section 16c to promote heat radiation. In order to improve the flow of this cooling air and improve heat dissipation, the heat dissipation section 1
The fins 17 of 6C are arranged in the air blowing direction (fifth direction) of the electric fan 19.
The fins 17 are arranged in parallel along the arrow A direction in the figure, and the arrangement pitch (interval) of the fins 17 becomes smaller toward the windward.

Other parts that are the same as those in the first embodiment described above are given the same reference numerals and their explanations will be omitted.

In the second embodiment, the heat absorbing part 13c of the inside thermosiphon 13 is arranged so as to be aligned with the back surface of the inside plate 14 of the heat insulating wall 5, so the thermosiphon 13 does not need to be exposed inside the cooling chamber 6. This has the advantage that the appearance of the inside of the cooling chamber 6 can be improved and the effective volume of the cooling chamber 6 can be further expanded.

Furthermore, the electric fan 19 operates the thermosiphon 16 outside the warehouse.
Since the heat dissipation portion 16c is forcedly cooled, the heat dissipation performance can be further improved.

Note that the electric fan 19 is not limited to a propeller fan, and for example, a cross-flow fan may be used (if a cross-flow fan is used, the ventilation duct 18 can be made thinner);
The location of the electric fan is not limited to the rear of the heat radiating section 16c, but may be in front or on the side.

Further, in each of the above embodiments, each thermosiphon is 9° 10°.
In 13.16, the refrigerant in the refrigerant tanks 9a, 10a is circulated through one vibrator 9b, 10b, but at least one thermosiphon is connected to the refrigerant tank 9a.
, 10a may be configured such that a plurality of refrigerant passages are provided in parallel. For example, as shown in Figure 6,
The inside thermosiphon 21 connects two or more vibrators 9b to one refrigerant tank 9a, and connects each pipe 9b.
The refrigerant may be circulated through.

Alternatively, as in the inside thermosiphon 22 shown in FIG. 7, the vibrator 23 connected to the refrigerant tank 9a may be branched to provide two branch passages 23a, 23b in parallel, and both branch passages 23a, 23b may be formed. The refrigerant may be divided into two parts. In addition, the inside thermosiphon 21 of FIGS. 6 and 7.
22 has a heat absorbing part arranged in a meandering manner along the back surface of a metal inner plate 14 of the heat insulating wall 5, and the inner plate 14 is used as a cooling surface, and has a structure similar to that of a so-called vibe-on-sheet type cooler. It becomes.

On the other hand, as shown in FIG.
Also, two or more pipes 10b may be connected to one refrigerant tank 10a, and the refrigerant may be circulated through each vibrator 10b. Alternatively, the refrigerant tank 10a, like the thermosiphon 25 outside the warehouse shown in FIG.
Two branch passages 2 are created by branching the pipe 26 connected to the
6a.

26b may be provided in parallel to separate the refrigerant into both branch passages 26a and 26b.

As shown in FIGS. 6 to 9 described above, for at least one thermosiphon 21, 22.24° 25,
If a configuration is adopted in which a plurality of refrigerant passages in and out of the refrigerant tanks 9a and 10a are provided in parallel, there is an advantage that the refrigerant circulation ability is further improved and the heat transport ability is further improved.

Note that the number of refrigerant passages provided in parallel is not limited to two, but may be three.
Needless to say, it can be more than a book.

[Effects of the Invention] As is clear from the above description, the present invention provides a thermosyphon refrigerant in which a thermoelectric element is arranged on the ceiling of a cooling chamber, and a refrigerant is filled in the heat absorption surface and the heat radiation surface of the thermoelectric element, respectively. The tanks are placed in close contact with each other, and the inside thermosiphon is arranged so that the heat dissipation part (refrigerant tank) is at the top of the inside thermosiphon and the heat absorption part is at the bottom. ) is placed at the bottom of the outside thermosiphon and the heat dissipation part is at the top, making it possible to ideally arrange the thermosiphon and allow the thermosyphon to cool the refrigerator from inside the cooling room. By transferring heat to the outside extremely efficiently, cooling efficiency can be greatly improved and the internal volume of the refrigerator can be expanded.

In this case, the heat absorbing part of the inside thermosyphon is arranged so as to be aligned with the back side of the inside plate of the ceiling insulation wall of the cooling room.
If the inner plate is used as a cooling surface, there is no need to expose the thermosiphon inside the cooling chamber, the appearance of the inside of the cooling chamber can be improved, and the effective volume of the cooling chamber can be further expanded.

Furthermore, if at least one thermosiphon is configured to have a plurality of parallel paths for refrigerant going in and out of the refrigerant tank, the refrigerant circulation ability and hence the heat transport ability can be further improved.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention, with FIG. 1 being a longitudinal sectional side view of the entire system, and FIG. 2 being a cutaway perspective view of a refrigerant tank portion of a thermosiphon. 3 to 5 show the second embodiment of the present invention, and the third embodiment shows the second embodiment of the present invention.
4 is a perspective view showing the arrangement of thermosiphons inside the refrigerator, and FIG. 5 is a perspective view showing the arrangement of thermosiphons outside the refrigerator. On the other hand, FIGS. 6 and 7 are perspective views showing modified examples of the inside thermosiphon, and FIGS. 8 and 9 are perspective views showing modified examples of the outside thermosiphon. FIG. 10 is an overall longitudinal sectional side view showing a conventional example. In the drawing, 1 is the refrigerator body, 2 is an outer box, 3 is an inner box, 4 is a heat insulator, 5 is a heat insulating wall, 6 is a cooling chamber, 8 is a thermoelectric element, 8a is a heat absorption surface, 8b is a heat radiation surface, 9 is a heat radiation surface Inside thermosiphon, 1
0 is a thermosiphon on the outside of the refrigerator, 9a and 10a are refrigerant tanks, 9b and 9C are pipes, 9c is a heat absorption part, 10c is a heat radiation part, 11 and 12 are fins, 13 is a thermosiphon on the inside of the refrigerator, 14 is an inside plate, 16 is a Outside thermosiphon, 1
7 is a fin, 19 is an electric fan, 21 and 22 are thermosiphons inside the refrigerator, 23 is a vibrator, 23g and 23b are branch passages, 24 and 25 are thermosiphons outside the refrigerator, 26 is a vibrator, and 26a and 26b are branch passages. . Agent Patent Attorney Tsuyoshi Sato 10 Outside (III Thermosiphon Figure 1 Figure 2 Figure 3 Figure 4 JP, 5 Tsuzawa Figure 6 Figure Day C Figure 7 Figure 8 Figure 9

Claims (3)

[Claims] 1. In an electronic refrigerator using a thermoelectric element as a cold heat source, the thermoelectric element is disposed on the ceiling of the cooling chamber, and a refrigerant tank of a thermosiphon filled with refrigerant is closely attached to the heat absorption surface and the heat radiation surface of the thermoelectric element, respectively. The refrigerator inside thermosiphon is arranged so that the refrigerant tank, which becomes the heat dissipation part, is at the top of the refrigerator interior thermosiphon and the heat absorption part is at the bottom, and the cooling chamber is cooled by the heat absorption part, while the refrigerator outside thermosiphon is arranged so that the heat absorption part is at the bottom. The refrigerant tank, which becomes the heat absorption part, is arranged at the lowest part of the outside thermosiphon and the heat radiating part is at the top, so that the heat of the thermoelectric element is radiated outside the refrigerator by the heat radiating part. Features of electronic refrigerators. 2. 2. The electronic refrigerator according to claim 1, wherein the heat absorbing part of the internal thermosiphon is arranged so as to be aligned with the back surface of an inner plate of a ceiling insulation wall of the cooling chamber, and the inner plate is used as a cooling surface. 3. 3. The electronic refrigerator according to claim 1, wherein at least one of the thermosiphons is provided with a plurality of parallel refrigerant passages in and out of the refrigerant tank.