JPS63123974A - 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 Industrial Application] The present invention relates to a refrigerator, and more particularly to a refrigerator suitable for preventing a temperature rise in a freezer compartment when defrosting an evaporator.

[Conventional technology]

As a means to prevent the temperature rise in the freezing room during defrosting of the evaporator, as described in Japanese Patent Application Laid-Open No. 60-30977,
A damper device is provided above the evaporator to prevent the heat of the defrosting heater from flowing into the freezer compartment during defrosting.

[The problem that the invention attempts to solve]

In the above conventional technology, the damper opens and closes only during defrosting, and does not operate during normal cooling operation. Therefore, if moisture etc. adheres to the movable part of the damper, the movable part may freeze during defrosting. Sometimes it doesn't work.

To solve this problem, is it okay to heat the frozen part with a heater when the damper is operating?If frost grows on the moving part, the melting time will take a long time, delaying the damper's closing action, and causing warm air to flow into the freezer compartment. In some cases, this may be inconvenient for prevention.

The purpose of the present invention is to melt and remove the box attached to the evaporator (
To provide a refrigerator which prevents warm air around an evaporator from rising into a freezer compartment and warming food in the freezer compartment.

[Means for solving problems]

The above purpose is to provide a refrigerator in which cold air from the main evaporator is blown into the freezer compartment by a fan, and to provide an auxiliary evaporator above the main evaporator. This is achieved by cooling warm air.

[Effect]

When the defrosting heater is energized, the compressor is operated with the valve device flowing the refrigerant flow path to the auxiliary cooler at the top of the main cooler, so the warm air at the bottom heated by the defrosting heater rises. In addition, since heat is exchanged with the cooled auxiliary evaporator, it is possible to prevent the temperature of food stored in the frozen room from rising during defrosting.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. 1.2. 1 is a compressor, 2 is a condenser, 3 is a capillary tube,
4 is a main evaporator, 5 is an auxiliary evaporator, and 6 is a valve device that controls whether the refrigerant from the condenser 2 flows to the main evaporator 4 or to the auxiliary evaporator 5, forming a series of refrigeration cycles. are doing. 7 is a refrigerator box, 8 is a freezer compartment, 9 is a refrigerator compartment, 10 is a fan, and 11 is a motor that rotates the fan 10.

12 is a damper device for regulating the flow of cold air into the refrigerator compartment 9 to maintain a constant temperature, and 13 is a defrosting heater.

During normal cooling operation, the valve device 6 is in a state where the refrigerant from the condenser 2 flows to the main evaporator 4, and the air cooled here is sent to the freezing compartment 8 and the refrigerator compartment 9 by the fan 10. , the temperature of the freezer compartment 8 is -18°C by the operation of the damper device 12, etc.
The refrigerator compartment 9 is maintained at 3°C. If frost grows on the main evaporator 4 during this cooling operation, the fan 10 will stop and the valve device 6 will stop.
Since the refrigerant from the condenser 2 is controlled to flow to the auxiliary evaporator 5, the auxiliary evaporator 5 located above the main evaporator 4 is cooled. Thereafter, the defrosting heater 13 is energized, and the warm air heated here melts the frost attached to the main evaporator 4. At this time, the warm air passing through the main evaporator 4 exchanges heat with the auxiliary evaporator 5 to be cooled and flows into the freezer compartment 8 to prevent the temperature of the frozen food from rising. Furthermore, during normal cooling operation, no refrigerant is flowed into the auxiliary evaporator, so frost does not grow in this area and there is no need for defrosting.

〔Effect of the invention〕

According to the present invention, it is possible to prevent warm air from flowing into the freezing chamber during defrosting of the evaporator and increasing the temperature of the frozen food without using a movable part such as a damper.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle configuration diagram according to an embodiment of the present invention;
The figure is a longitudinal sectional view of a refrigerator that is an embodiment of the present invention. l...Compressor, 2...Condenser, 3...Capillary tube, 4...Main evaporator, 5...Auxiliary evaporator, 6
... Valve device, 7... Refrigerator box, 8... Freezer compartment,
9... Refrigerator room, IO... Fan, 11... Drive motor, 12°°° damper device, 13... Defrosting heater. Tea 1 diagram

Claims (1)

[Claims] 1. In a refrigerator that blows cold air from the main evaporator into the freezer compartment using a fan, an auxiliary evaporator is provided above the main evaporator, and the auxiliary evaporator collects warm air generated during defrosting from the main evaporator. A refrigerator characterized by cooling.