JPH10160314A - Absorption type refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heating effect by forming a structure for concentrating heating radiating holes of a back surface plate to upper and lower ends of the plate and blocking its intermediate part. SOLUTION: Since a constitution in which heat radiating holes 22 are concentrated at upper and lower ends of a back surface plate 20 and its intermediate part is blocked is adopted, a duct is formed of a heat insulation case back surface and the surface plate. Accordingly, heat is transferred by natural convection between two parallel flat surfaces, and hot air radiated from a cooling system 5 is raised between the two walls. Cold air is effectively supplied from heat radiating holes 24 at a lower stage of the surface plate by a stack effect. Heat radiating holes 23 and 22 of an upper stage of the surface plate become special purpose of heat radiating to smoothly radiate and circulate the heat. In addition, since its wind velocity is accelerated, the radiating efficiency of the system 5 is raised. A distance between the case and the surface plate is set so as to optimize a ventilating area of the duct formed of the back surface of the case and the surface plate, and hence high heat radiating effect can be always maintained irrespective of the distance between the back surface side of the refrigerator and a wall.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an absorption refrigerator.

[0002]

2. Description of the Related Art A conventional absorption refrigerator is disclosed, for example, in Japanese Patent Application Laid-Open No. 7-310967. As a feature of the absorption refrigerator, ammonia is used as a refrigerant, and since it has no mechanical noise and vibration as compared with a compressor type, it has been mainly used for guest rooms such as hotels and inns.

However, in recent years, the destruction of the ozone layer of specific CFCs has become a problem, and switching to alternative CFCs has also been carried out at a rapid pace in refrigerators. Against this background, absorption refrigerators that use ammonia as a refrigerant are being reviewed, because they have nothing to do with ozone depletion. Demand is gradually increasing even in ordinary households, and a second refrigerator is required to have a larger capacity and a freezer.

A conventional absorption refrigerator will be described below with reference to the drawings. FIG. 4 is a rear perspective view of a conventional absorption refrigerator.

[0005] 1 is an absorption refrigerator, 2 is a heat insulating box, and a heat insulating material 4 is filled between an outer box 3 and an inner box (not shown).

[0006] Hydrogen gas and ammonia water are sealed in the cooling system 5 and mainly include a generator 6, a rectifier 8,
It is configured by sequentially connecting a condenser 9, an evaporator (inside of the refrigerator, not shown), a liquid receiver 11, an absorber 10, and the like.

Next, the operation of the cooling system 5 will be described.
The ammonia gas heated and boiled by the generator 6 reaches a high temperature and reaches the rectifier 8, and is cooled by the rectifier 8 to condense and separate the contained water and return to the generator 6, and only the ammonia gas is condensed. 9 and is cooled and liquefied. The liquefied ammonia enters an evaporator (inside the storage, not shown) and evaporates and diffuses in the hydrogen gas there to produce a cooling effect. The evaporated ammonia gas mixes with the hydrogen gas to increase the specific gravity, flows down to the liquid receiver 11, flows into the absorber 10 from below, and rises. In the absorber 10, since the ammonia dilute solution flows down from above, only the ammonia in the mixed gas is absorbed by the mixed gas and becomes only hydrogen gas and reaches the evaporator (inside the storage, not shown). The interior (not shown) is cooled by repeating the above.

Reference numeral 20 denotes a back plate for preventing the cooling system 5 from coming into contact with the high-temperature portion. In order to release the heat of the rectifier 8, the condenser 9 and the absorber 10, a human finger is used. A heat radiating hole 21 of such a size that it does not enter is provided on the entire back plate. In addition, on the upper rear part of the outer box 3, so as not to hinder the rising natural convection due to heat radiation from the cooling system 5,
A heat radiating hole 22 having a size that does not allow a human finger to enter is provided.

[0009]

However, the conventional structure is
Since the heat radiating holes are provided on the entire back plate, the following problems are caused. FIG. 2 is a schematic view of a heat radiation path of a conventional absorption refrigerator. In the conventional structure, a heat radiation hole 21 is provided on the entire surface of a back plate 20, so that heat is released only by heat transfer by natural convection in an open space. As shown by the arrow in the figure, the heat dissipation hole 21
There is a problem in that the heat radiated from the lower stage is re-inhaled from the upper stage, so that heat is circulated wastefully, and the wind speed cannot be obtained, resulting in poor heat radiation efficiency. Depending on the distance A to the wall surface on the back side of the refrigerator at the time of installation, a duct may be formed between the back surface of the heat-insulating box and the wall surface, and the chimney effect may be obtained, which may be a slight solution. However, the effect is the distance A from the wall on the back side of the refrigerator.
It depends on.

An object of the present invention is to provide an absorption refrigerator having high heat radiation efficiency.

[0011]

In order to achieve the above object, a refrigerator according to the present invention is an absorption type refrigerator comprising a cooling system, a back plate and a heat insulating box, wherein heat radiating holes in the back plate are formed at the upper and lower ends of the back plate. It has a structure in which the middle is closed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a refrigerator according to the present invention will be described below with reference to FIG.

FIG. 1 is a rear perspective view of an absorption refrigerator according to an embodiment of the present invention. 1 is an absorption refrigerator, 2 is a heat insulating box, and a heat insulating material 4 is filled between an outer box 3 and an inner box (not shown). In the upper part of the back of the outer box 3, so as not to hinder the upward natural convection due to heat radiation from the cooling system,
A heat radiating hole 22 having a size that does not allow a human finger to enter is provided. Reference numeral 20 denotes a back plate for preventing the absorption cooling system 5 from coming into contact with a high-temperature portion. The rear plate 20 has a configuration in which a heat radiating hole 23 is provided at an upper end and a heat radiating hole 24 is provided at a lower end, and an intermediate portion thereof is closed. Heat dissipation hole 23
Is formed with a slit having a size that does not allow a human finger to enter, and the total opening area of the heat radiation holes is equal to or greater than the ventilation area of the duct formed by the back of the heat-insulating box and the back plate. The heat radiating hole 24 is also formed by a slit having a size that does not allow human fingers to enter, and the total opening area of the heat radiating hole is equal to the ventilation area of the duct formed by the back of the heat insulating box and the back plate. Above.

The effect of this configuration will be described with reference to FIG.

FIG. 3 is a schematic diagram of a heat radiation path as viewed from the side of the box of the absorption refrigerator of the present invention. Since the heat radiating holes are concentrated at the upper and lower ends of the back plate 20 and block the middle thereof, a duct is formed between the back of the heat insulating box and the back plate. Therefore, heat is transferred by natural convection between two parallel planes, and the hot air radiated from the cooling system 5 rises between the two wall surfaces as indicated by arrows in the figure. Due to the chimney effect, the cool air is reliably supplied from the heat radiating holes 24 at the lower stage of the back plate, and the heat radiating holes 23 and 22 at the upper stage of the rear plate are exclusively used for heat radiating, so that heat circulating is smoothly performed. In addition, because the wind speed increases,
The heat radiation efficiency of the cooling system 5 increases. In addition, by setting the distance B between the rear surface of the heat insulating box and the rear plate so as to optimize the ventilation area of the duct formed by the rear surface of the heat insulating box and the rear plate, the distance between the rear wall of the refrigerator and the wall surface of the refrigerator can be reduced. Irrespective of the distance A, a high heat radiation effect can always be maintained.

[0016]

According to the present invention, there is provided an absorption refrigerator comprising an absorption cooling system, a back plate, and a heat insulating box, wherein the heat radiating holes of the back plate are concentrated at the upper end and the lower end of the back plate, and the middle thereof is closed. Because of the structure, there is no waste of heat circulating such as radiating hot air from the lower heat radiating hole and re-inhaling the hot air from the upper heat radiating hole. Efficiency can be increased. In addition, by optimizing the distance B between the rear surface of the heat insulating box and the rear plate, a high heat radiation effect can always be maintained without being affected by the distance A between the wall surface on the rear side of the refrigerator.

[Brief description of the drawings]

FIG. 1 is a perspective view of an absorption storage according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a heat radiation path of a conventional absorption refrigerator.

FIG. 3 is an explanatory diagram of a heat radiation path of the absorption refrigerator of the present invention.

FIG. 4 is a perspective view of a conventional absorption refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Absorption refrigerator, 2 ... Insulated box, 3 ... Outer box, 4 ... Heat insulation material, 5 ... Cooling system, 6 ... Generator, 8 ... Rectifier, 9 ... Condenser, 10 ... Absorber, 11 ... Liquid receiver, 20: back plate, 22, 23, 24: radiating hole.

Claims (1)

[Claims] 1. A heat insulating box, a cooling system attached to the rear side of the heat insulating box, and a back plate covering the rear surface of the heat insulating box to prevent contact of the cooling system with a high-temperature portion. An absorption refrigerator, wherein the heat radiating holes of the rear plate are concentrated at the upper end and the lower end of the rear plate, and the intermediate portion is closed.