JPS6237657A - Evaporator for 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 Field of the Invention The present invention relates to an evaporator for a refrigerator used in a refrigerator or the like.

2. Description of the Related Art A conventional evaporator for a refrigerator used in a refrigerator or the like will be explained with reference to FIGS. 4 and 6. Reference numeral 1 denotes an evaporator for a refrigerator, which is composed of a vertical section 2 and an inclined section 3. Said vertical part 2
, and the inclined portion 3 are each composed of a fin 4 and a refrigerant pipe 5. Further, the vertical portion 2 and the inclined portion 3 are connected in series in the refrigerant circuit. 6 and 7 are vertical portions 2. and 7, respectively. A defrosting heater 6.7 provided in close proximity to the inclined part 3 periodically generates heat to remove frost adhering to the evaporator 1 by heat conduction. There is.

Moreover, the air flow path is from the upper part 3a of the inclined part 3 to the lower part 3b,
Then, it is installed inside a refrigerator or the like so that airflow flows from the lower part 2a of the vertical part 2 to the upper part 2b.

Problems to be Solved by the Invention However, with such a structure, during defrosting, the amount of frost formed on the inclined portion 3, which is upstream of the airflow, is larger, so the evaporator 1
The overall defrosting time was not uniform, and it was necessary to heat the vertical section 2 more than necessary, which caused an increase in the temperature inside the refrigerator, etc., and also became a factor that hindered the reduction in the thickness of the evaporator 1. .

Therefore, the present invention aims to equalize the defrosting temperature of the evaporator, shorten the defrosting time, and make it possible to make the evaporator thinner.

Means for Solving the Problems In order to solve the above problems, the evaporator of the present invention is provided with a defrosting heater at the connection between the vertical coil and the oblique coil, and at the inlet and outlet of the evaporator. An evaporator for a refrigerator is constructed by having an on-off valve in the refrigerant circuit that is closed during defrosting.

Effect The present invention has the above-described configuration, so that during defrosting, the inlet of the evaporator,
By closing the opening/closing valve at the outlet, the evaporator has the same configuration as a single heat pipe, and the refrigerant heated by the defrosting heater installed at the connection between the vertical coil and the inclined coil is heated. Since evaporation rises and condensation falls efficiently within the evaporator, defrosting can be done in a short time and the temperature rise in the evaporator can be made uniform.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

Reference numeral 8 denotes an evaporator for the refrigerator, which consists of a vertical coil 9 and an inclined coil 10. Both coils 9 and 10 each include a refrigerant pipe 11 and a fin 12.

Both coils 9 and 10 are assembled by inserting the refrigerant pipe 11 into the fin 12 and then expanding the refrigerant pipe 11. Both coils 9 and 1o are connected in series, and the refrigerant flow is from the upper part 10A of the oblique coil 10 to the lower part 1oB of the vertical coil 9, and then to the lower part 9A of the vertical coil 9.

It flows to the upper part 9B. Reference numeral 14 denotes a defrosting heater, which is fixed so as to reliably contact the connecting portion 13 of both the coils 9 and 1o. The upper part of the heater mounting plate 16 has a sealed structure to prevent defrosting water and the like from falling directly onto the heater 14.

1eA and 1sB are on-off valves that close only when the compressor (not shown) is stopped and when defrosting.

In the above configuration, when defrosting, first the on-off valve 16A is activated.

16B is closed. The liquid refrigerant inside the evaporator 8 is
It accumulates in the connection part 13 of the evaporator 8. Next, the defrosting heater 14
The liquid refrigerant is heated and evaporated. Since the inlet and outlet of the evaporator 8 are provided with on-off valves 16A and 18B, respectively, and are closed, the evaporator 8 becomes two heat pipes centered around the connection part 13, and the evaporated steam is transferred to the evaporator 8. Coil 9° rises to the top of coil 1o, and each coil 9, 1
By melting the frost attached to the surface of the refrigerant, the refrigerant is cooled and condensed to become a liquid, which flows through the inner surface of the refrigerant pipe 11 and returns to the connection part 13 of the μ generator 8. The returned liquid refrigerant is heated again by the defrosting heater 14 and evaporated. By repeating the above operations, the heat of the defrosting heater 14 installed at the connection part 13 of the evaporator 8 is transferred to each coil 9 of the evaporator 8.
Since it can be moved effectively and at high speed to the top of 1o, the capacity of the defrosting heater is smaller compared to conventional ones.
Moreover, the defrosting time can be shortened.

Effects of the Invention The present invention has two coils connected in series, one of the two coils is positioned vertically, and the other is located below the connecting portion with the vertically installed coil. It is installed at an angle, has a defrosting heater at the connection part, and has on-off valves at the refrigerant inlet and outlet of the vertical coil and the inclined coil, which are closed during defrosting. In this case, the evaporator has the same configuration as two heat pipes around the connection part, and the refrigerant in the evaporator heated by the defrosting heater at the evaporator connection part efficiently evaporates and rises in the evaporator and condenses. Since it lowers, it is possible to defrost in a short time and to equalize the temperature rise of the evaporator, which reduces the amount of electricity required for the defrost heater, resulting in power savings and reducing the temperature rise inside the refrigerator during defrosting. can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an evaporator according to an embodiment of the present invention, and FIG.
The figure is a front view of the evaporator extended from the connection part in figure 1,
The figure is a side view of a conventional evaporator, and FIG. 4 is a front view of the evaporator extended from the connection portion shown in FIG. 3. 8... Evaporator, 9... Vertical coil,
10... Slanted coil, 13... Connection portion, 14... Defrosting heater, 16A, 16B
・・・・・・Opening/closing valve. Name of agent: Patent attorney Toshio Nakao and 1 other person 80
, Arayaki 9... Koi 'shi/68 hj3...
Novel, choki de... Coil 14... 1 extra million waste heater f3... Sanrinya section 3rd figure 4th figure!

Claims (1)

[Claims] It has two coils connected in series, one of the two coils is installed vertically, and the other coil is installed diagonally with the connection part with the vertically installed coil located downward. The refrigerant inlets of the vertically installed coil and the diagonally installed coil have on-off valves that close during defrosting, and a defrosting valve is provided at the connection between the two coils. An evaporator for refrigerators equipped with a heater.