JPH03211372A - Thermo-siphon and electronic refrigerator - Google Patents

Abstract

PURPOSE:To obtain a low cost thermo-siphon with a simple construction by a method wherein a closed loop path is formed which includes an evaporator section at the upper part and a condenser section at the lower part and is filled with working fluid, and an air-lift pump is provided at the lower part of the path to pump the liquid working fluid up to the evaporator section. CONSTITUTION:A closed path 10 is formed in a rectangular loop shape, its upper horizontal pipe works as an evaporator section 11, its rising pipe 12 is heat-insulated around the periphery, the lower part of its falling pipe 13 works as a condenser section 14, and the lower end of the falling pipe 13 is connected to the lower end of the rising pipe 12 by a nearly horizontal connecting pipe 15. An air-lift pump 16 is provided at the lower end of the rising pipe 12 of the closed path 10 to pump liquid working fluid from the lower part up to the evaporator section 11. When a heating element 17 of the air-lift pump 16 is energized, the working fluid around a small pipe 16a is heated and boiled, and bubbles glow on the outer surface and finally leave from the outer surface of the small pipe 16a. As a result, a mechanical pump and a separator become unnecessary and the cost can be reduced with a simple construction.

Description

Detailed Description of the Invention [Purpose of the Invention (Industrial Application Field) The present invention provides a loop-shaped device having an evaporating section at the top, a condensing section at the bottom, and a working fluid sealed inside. The present invention relates to a thermosiphon constituted by a sealed conduit, and an electronic refrigerator using this thermosiphon.

(Prior Art) Conventionally, as shown in FIG. 7, in a thermosiphon 2 having an evaporator 1 at the top, the working fluid condensed and liquefied in the condensing section 3 at the bottom is not returned to the evaporator 1 at the top. A mechanical pump such as a gear pump is used as the pump 4 for this purpose.

(Three problems to be solved by the invention) However, since the pump 4 is mechanical, it is expensive, and if more than a certain amount of gas is mixed into the suction side of the pump 4, the pump cannot function properly. In order to prevent gas from flowing into the pump 4, it is necessary to provide a relatively large gas-liquid separation tank 5, which has the disadvantage of increasing costs overall.

Further, an electronic refrigerator using a thermo module has been considered, but this requires a fairly large heat radiator on the back of the housing, which has the disadvantage of increasing the overall size.

Therefore, an object of the present invention is to provide a thermosiphon that is simple in structure and can be manufactured at low cost, and also to provide a small-sized electronic refrigerator by using the above-mentioned thermosiphon.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a loop-shaped sealed conduit having an evaporating section in the upper part and a condensing part in the lower part, in which a working fluid is sealed. , provides a thermosiphon characterized in that a bubble pump is provided at the bottom of this sealed pipe line to push the working fluid in a liquid state to an evaporation section; A heat absorber is provided in the body in contact with the cooling side of the electronic cooling element, and an upper evaporation part is in contact with the heating side of the electronic cooling element, and the parts other than the contact portion are arranged along the outer wall of the heat insulating casing. A condensing section is formed by a loop-shaped sealed pipe in which a working fluid is sealed, and a bubble pump is installed at the bottom of this sealed pipe to push the working fluid in a liquid state to an evaporating part. It provides a refrigerator.

(Function) According to the above-described means, a mechanical pump and a gas-liquid separation tank are not required, the structure is simple, the cost can be reduced, and the electronic refrigerator can be downsized.

(Example) A first example of the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 10 denotes a sealed pipe line formed in a substantially rectangular loop shape, the upper, substantially horizontal part of which is an evaporator part 11, the surrounding part of the rising part]2 is insulated, and the lower part of the falling part 1B is a condensing part 14.
The lower end of the falling portion 13 and the lower end of the rising portion 12 are connected by a substantially horizontal connecting portion 15. A bubble pump 16 is provided at the lower end of the rising portion 12.

This part has a large diameter outer circumferential part, and a small diameter part 16a that extends downwardly is provided in the center part, and the small diameter part 16a
A heating element 17 is inserted into the inner circumference of the housing.

Note that metal powder is thermally sprayed on the outer periphery of the small diameter portion 16a to promote boiling. Further, inside the sealed conduit 10, Freon gas such as R12R13, R113, etc. is sealed as a working fluid.

Next, the operation of the above configuration will be explained. bubble pump 16
When the heating element 17 is energized, the working fluid around the small diameter portion 16a is heated and boils, and bubbles grow on the surface and eventually separate from the surroundings of the small diameter portion 16a. The released bubbles are
Thereafter, they become larger and move up the rising portion 12 while merging with each other. For this reason, the liquid mixed with air bubbles flows into the evaporator 11 due to the density difference between the liquid and the liquid from the condensing part 14 due to the presence of air bubbles, and the rise of the liquid due to the rise of the air bubbles.
The first liquid absorbs heat from its surroundings and evaporates, flows down the falling portion 13, releases heat to the surroundings in a condensing portion 14, and liquefies again. In this case, since the rising portion 12 is insulated, bubbles will not disappear during the rise.

In the above-mentioned embodiment, there is no need to provide the conventional gas-liquid separation tank 5, and there is no need to provide the mechanical pump 4, so the overall size can be made smaller and cheaper, and there is no mechanically operating part. , therefore, it has excellent reliability.

Note that a bubble pump may be constructed by wrapping a heater wire around the outer periphery of the rising portion 12, or a sheathed heater may be inserted directly into the rising portion 12.

3 to 6 show a second embodiment of the present invention, and only the parts different from the first embodiment will be explained.

Reference numeral 18 denotes a heat insulating case with a door 18a that can be opened and closed on the front side, an electronic cooling element]9 is attached to a mounting part 18b formed on the back side of this case, and a heat absorbing part is attached to the cooling part on the front side of this case. Fins 20 for heat absorption are provided. A heat absorption case 21 as an evaporator is provided on the back side of the electronic cooling element 19, and the upper end of a riser pipe 22 is connected to the bottom of this case.

Further, the riser pipes 23, 23 as condensing parts connected to the upper side surface of the heat absorption case 21 are arranged in a meandering manner along the inside of the outer surface of the heat insulating case 18, and the riser pipes 23. It is connected to the lower end of 22. This riser pipe 22
A bubble pump 16 similar to that of the first embodiment is provided at the lower end of the
is provided.

Next, the operation of the above configuration will be described. Electronic cooling element 19
When energized and the heating element 17 is energized, the heat absorbing section on the front side is cooled by the action of the electronic cooling element 19, and the heat inside the heat insulating casing 18 is removed from the heat absorbing fins 20. At the same time, the back surface of the electronic cooling element 19 becomes highly heated, and heat is applied to the working fluid in the heat-absorbing case 21 to vaporize the working fluid.

The working fluid that has been vaporized by removing heat in this way descends ten times down the meandering arrangement of the riser pipe 23, radiating heat to the surroundings and condensing, and is liquefied at the lower end of the riser pipe 22. reach. On the other hand, the working fluid around the small diameter portion 16a of the riser pipe 22 is heated and boiled by the heating element 17, and the bubbles generated thereby cause the liquid working fluid flowing down to the lower part of the down pipe 23 to boil in the same manner as described above. and ascend the riser pipe 22.

In this embodiment, since there is no need for large heat dissipation fins as in the conventional refrigerator, it is possible to downsize the electric refrigerator and reduce the area required for installation.

[Effects of the Invention 1] As is clear from the above description, the present invention provides a loop-shaped sealed conduit having an evaporating section at the upper part, a condensing section at the F section, and a working fluid sealed inside. Since this thermosiphon is characterized in that a bubble pump is provided at the bottom of this sealed pipe to push up the working fluid in a liquid state to an evaporation section, a mechanical pump and a gas-liquid separation tank are not required, and the structure is simple. is simple and can reduce costs. In addition, an insulated casing is provided, and a heat absorber is provided in this insulated casing in contact with the cooling side of the electronic cooling element, so that the upper evaporation part is connected to the electronic cooling element. A condensing section is formed by arranging the part other than the contacting part along the outer wall of the heat insulating casing, which is in contact with the heating side. Since a bubble pump is provided at the bottom of the conduit to push up the working fluid in liquid state to the evaporation section, an excellent effect is achieved in that the electronic refrigerator can be made smaller.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention, in which FIG. 1 is an enlarged sectional view of the main part, FIG. 2 is a side view of the overall configuration, and FIGS. 3 to 6. 3 shows the second embodiment of the present invention, FIG. 3 is an overall longitudinal sectional view, FIG. 4 is a exploded view of the thermosiphon, FIG. 5 is a rear view, and FIG. 6 is a side view. , FIG. 7 is a diagram corresponding to FIG. 2 of the conventional configuration. In the drawing, 10 is a sealed pipe, 11 is an evaporation section, 12 is a rising section, 13 is a falling section, 14 is a condensing section, 16 is a bubble pump, 17 is a heating element, 18 is a heat insulating casing, and 19 is an electronic cooling unit. 20 is a heat absorption fin (heat absorber), 21 is a heat absorption case (evaporation part), 22 is a riser pipe, and 3 is a fall pipe (condensation part).

Claims (1)

[Claims] 1. A loop-shaped sealed pipe in which an evaporating section is provided at the top and a condensing section is provided at the bottom, and a working fluid is sealed inside; A thermosiphon that is equipped with a bubble pump that pushes the working fluid up to the evaporation section. 2. A heat-insulating casing, a heat absorber provided in the heat-insulating casing and in contact with the cooling side of the electronic cooling element, and an upper evaporator part that is in contact with the heating side of the electronic cooling element, and the parts other than the contact portion are insulated. A sealed pipe line arranged along the outer wall of the casing to form a condensing section and in which a working fluid is sealed in a loop shape; and a bubble pump that pushes up working fluid to the evaporation section.