JPS5831275A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerator in which a high-pressure refrigerant pipe serving as a condenser of a cooling cycle is attached inside the back of an outer box.

Conventionally, in order to keep the back of a refrigerator clean, a high-pressure refrigerant tube was attached to the back of the refrigerator's outer box using aluminum foil, and then a foam insulation material such as hard urethane foam was filled between the outer and inner boxes. Proposal 2...

has been done.

However, with this structure, the surface area of the condenser is limited compared to so-called wire-and-tube condensers, which are installed outside the insulation wall (outside the back of the outer box), and the capacity is limited to only one side. Due to external heat dissipation, the degree of decrease in condenser capacity is large with respect to an increase in endothermic load, the condensing temperature tends to increase, and therefore the compressor input tends to increase.

Furthermore, as the heat of condensation increases, the temperature gradient between the outer box and the inner box becomes larger, increasing the heat absorption load, and both of these have the disadvantage of becoming a power-increasing element.

In order to improve the above-mentioned drawbacks, the present invention uses a hollow plate when attaching the high-pressure refrigerant pipe to the back of the outer box, thereby greatly reducing the heat transfer to the inside of the refrigerator. This improves heat transfer.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a refrigerator body, which is made up of an outer box 2, an inner box 3, and a foamed heat insulating material 4 filled between the two boxes 2.3. 6 is a heat insulating door provided on the front side of the main body 1. 6 is a cooling cycle compressor, 7 is a high-pressure refrigerant pipe forming a condenser, and 8 is an evaporator. Reference numeral 9 denotes a back plate of the outer box 2, on which a high-pressure refrigerant pipe 7 is provided so as to meander laterally from above to below.

1o is a hollow panel in which a hollow part 12 with a high degree of vacuum is formed by welding or welding a plastic panel formed by blow molding or a metal panel formed by press molding. A groove 11 is formed,
The peak portion 11a of the groove 11 is in contact with the other surface. Then, this hollow panel 10 accommodates a high-pressure refrigerant pipe 7 in the groove 11 via a heat conduction seek 13, and installs this pipe 7 in contact with the back plate 9. Finally, foam insulation is formed between the inner and outer boxes 2 and 3. It is finally fixed by filling with material 4.

In such a thing, the outer box 2 on the back wall of the main body 1
and the distance between the inner box 3 and the inner box 3 is L-0.05m, and the inner box 3 and the hollow plate 1o.
The distance L1 = 0.04 m, the thickness L2-o of the hollow plate 1o,
01m, thermal conductivity of foam insulation material λ2: 0.0150
(K cal /mh 'C) Thermal conductivity of hollow plate λ2
= 0.0015 (Kcal/mh'c),
Becomes insulation material. On the other hand, the heat transfer resistance R' when the insulation wall is made of foam insulation material is L O,051 R'= -= -= 3.33 () λ10. ○15 Kcal /rrtb'c
This is a difference of approximately three times.

This reduces the transfer of heat from the high-pressure refrigerant pipe 7 to the inside of the refrigerator. Furthermore, since the high-pressure refrigerant pipe 7 is attached to the hollow plate 1° through the heat-conducting seek 13, heat conduction of the high-pressure refrigerant pipe 7 to the back plate 9 of the outer box 2 is well performed.

Further, the groove 11 of the hollow plate 10 is deepened so that the peak portion 11 of the hollow plate 10 is deepened.
If a is brought into contact with the other surface side, it can serve as a rib to prevent flattening due to the difference in internal and external pressure during vacuum.

As is clear from the above examples, in the present invention, the high-pressure refrigerant pipe is attached to the back of the outer box using a hollow panel, so the heat transfer to the inside of the refrigerator can be further reduced compared to using foam insulation only, and the cooling operation rate can be reduced. In addition, since the heat of the high-pressure refrigerant pipe is transmitted to the outer box side using a thermally conductive sieve, the heat is transmitted well and the heat dissipation of the high-pressure refrigerant pipe can be enhanced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a refrigerator according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main part of FIG. 2...Outer box, 3...Inner box, 4...
・・Foam insulation material 7 ・・・High pressure refrigerant pipe 1
0 , , , , hollow board, 11□, +□ groove, 12 ,,
, , , hollow part , 13 , . ...Thermal conductive sieve.

Claims (2)

[Claims] (1) Equipped with an outer box, an inner box, a foam insulation material filled between the two boxes, and a high-pressure refrigerant pipe for the cooling cycle provided in the outer box, and conducts heat through the high-pressure refrigerant pipe into the groove of the hollow board. In this refrigerator, the hollow disc is placed between a foamed heat insulating material and the wall of the outer box, and the hollow disc is placed between the foamed heat insulating material and the wall of the outer box, with the high-pressure refrigerant pipe facing the wall of the outer box. (2) The refrigerator according to claim 1, wherein the hollow portion of the hollow plate is evacuated.