JPH10238932A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress temperature rise in a refrigerator at the time of defrosting by bent extending a lower part of a heat transfer plate provided at the rear of an evaporator under a defrosting heater, and efficiently utilizing radiant heat of the heater, thereby shortening the defrosting time. SOLUTION: In the refrigerator, cold gas is supplied to a deep freezing chamber 7, a cold storage chamber and a vegetable chamber 9, and then it is returned to an evaporator 10 via cold gas circulating channels 6a, 6b formed at a heat insulation partition between the chambers 7 and 9. In this case, a lower part of a heat transfer plate 21 mounted on the surface of an inner box 3 is bent extended to a lower part of defrosting heater 15, and at the time of defrosting, radiant heat from the heater 15 is efficiently transferred to an upper part of the evaporator 10. And, a protective cover 16 disposed between the evaporator 10 and the heater 15 is inclined forward, and its rear part is extended rearward from a back surface of the evaporator 10, defrosted water dropped from the evaporator 10 to the cover 16 is fed forward to prevent the plate 21 from being moistened with the water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator, and more particularly, to a structure of a heat transfer plate provided at least in front of or behind a evaporator in order to further reduce defrosting time.

[0002]

2. Description of the Related Art A refrigerator has a freezer compartment 7, a refrigerating compartment 8, and a vegetable compartment 9 as shown in FIG. 1, for example, and cool air generated by an evaporator 10 arranged behind the freezer compartment 7 is provided. Blower 1
1 to the freezing compartment 7 and the cold air distribution compartment 12
Is supplied to the refrigerator compartment 8 and the vegetable compartment 9 through the cold air duct 13 connected to the refrigerator compartment 7, and the cold air supplied to each compartment is supplied to the freezing compartment 7
The heat is returned to the evaporator 10 through the cool air recirculation passages 6a and 6b formed in the heat insulating partition body 6 between the food compartment 9 and the vegetable compartment 9.

[0003] The temperature of the evaporator 10 is controlled by the compressor 20.
During the operation of, the temperature drops to about −30 ° C. On the other hand, the cool air returning to the evaporator 10 through the cool air recirculation path 6b has risen to about 5 to 7 ° C. and is accompanied by moisture, so that the evaporator 1
Frost is generated on the surface of No. 0 and freezes. The amount of frost adhering to the evaporator 10 increases as the operation time of the compressor 20 elapses, and accordingly, the heat exchange performance of the evaporator 10 decreases. Therefore, a defrost heater 15 is arranged in parallel below the evaporator 10 and the radiant heat is used to defrost the evaporator 10, while an aluminum plate is formed between the evaporator 10 and the defrost heater 15. A protective cover 16 is provided so that the defrost heater 15 is
It is designed to protect against defrost water flowing down from zero.
Also, as shown in FIG.
4, a heat insulating material 23 and a heat transfer plate 22 a are superimposed and attached, and the heat transfer plate 22 a absorbs radiant heat radiated from the defrost heater 15 at the time of defrost, and transfers the heat to the upper portion of the evaporator 10. The defrosting time is shortened.

[0004]

However, even with the above structure, it takes a considerable time for the radiant heat of the defrosting heater to be transmitted to the upper part of the evaporator, and the defrosting time is prolonged. There is a problem that the rise of the internal temperature becomes large. Therefore, in the present invention, by efficiently using the radiant heat of the defrost heater to shorten the defrost time,
It is an object of the present invention to provide a refrigerator that suppresses a rise in the internal temperature during defrosting.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a heater for defrosting is disposed substantially in parallel and horizontally below an evaporator disposed behind a freezing compartment. In addition, a protective cover is provided between the evaporator and the defrosting heater to protect the heater from defrost water, and cool air generated by the evaporator is supplied to a freezing room by a blower, and through a cool air duct. It is supplied to the refrigerator compartment and the vegetable compartment, and is returned to the evaporator through the cool air return path formed in the heat insulating partition between the freezer compartment and the refrigerator compartment or between the freezer compartment and the vegetable compartment, and forward or backward of the evaporator. In a refrigerator provided with a heat transfer plate on at least one of the above, the radiant heat radiated from the heater for defrosting during the defrosting is transferred to the evaporator, the heat transfer plate provided behind the evaporator The lower part A configuration in which by extending bent to below the frost heater.

In addition, a lower portion of a heat transfer plate provided in front of the evaporator is bent and extended to the front of the defrosting heater, and a plurality of ventilation holes are provided in the extension surface. In addition, the protective cover disposed between the evaporator and the defrosting heater is inclined forward, and the rear portion extends rearward from the back surface of the evaporator. The heat transfer plate is made of aluminum.

[0007]

According to the present invention, the lower part of the heat transfer plate provided behind the evaporator is bent and extended to below the heater for defrosting provided at the lower part of the evaporator. age,
In addition, the lower part of the heat transfer plate provided in front of the evaporator is bent and extended to the front of the defrost heater, and a plurality of ventilation holes are provided on the extension surface. Heat can be transferred to the upper part of the evaporator more quickly, and the protective cover disposed between the evaporator and the defrosting heater is tilted forward, and the rear part is located behind the back of the evaporator. As a result, the defrost water that has fallen on the protective cover from the rear of the evaporator can flow forward, and the defrost water can be prevented from dropping on the rear heat transfer plate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the inside of the refrigerator from the side. Reference numeral 1 denotes a refrigerator main body including an outer box 2, an inner box 3, and a foam insulating material 4 filled between the two. The inside of the inner box 3 is divided into a freezer compartment 7, a refrigerator compartment 8 and a vegetable compartment 9 by two upper and lower heat insulating partitions 5 and 6. Behind the freezing room 7, there is an evaporator 10 and a blower 11 for circulating the cool air generated by the evaporator 10 to each of the above-mentioned rooms 7 to 9. The cool air to the refrigerating room 8 and the vegetable room 9 is supplied to the freezing room. Through a cool air duct 13 connected to a cool air distribution chamber 12 at the rear of the refrigerator 7, the cool air is first sent from a cool air outlet 8 a to the cool room 8, and then not shown through a cool air inlet 8 b at the bottom of the cool room 8. It is sent to the vegetable room 9 via the vegetable room duct. Each room 7-9
The cool air sent to the evaporator 10 is configured to return to the evaporator 10 through cool air return paths 6a and 6b formed in the heat insulating partition 6 between the freezing compartment 7 and the vegetable compartment 9.

In addition, at the rear of the heat insulating partition 6 located directly below the evaporator 10, there is a gutter-shaped dew receiving portion 14,
Almost at the center of the dew receiving section 14, a defrost heater (glass tube heater) 15 which is turned on at the time of defrost, and an aluminum-made heater for protecting the defrost heater 15 from defrost water flowing down from the evaporator 10. A protection cover 16 is provided. The defrost water flowing down to the dew receiving portion 14 is discharged through a drain pipe 17 to an evaporating dish 19 in a machine room 18 formed at a lower rear portion of the refrigerator main body 1 and utilizes heat generated by the compressor 20 and the like. It is designed to evaporate. Further, a heat transfer plate described below is provided on one or both of the rear and the front of the evaporator 10.

FIGS. 2 and 3 show a first embodiment in which an aluminum heat transfer plate 21 is provided behind the evaporator 10. The feature of the first embodiment is that it is mounted on the surface of the inner box 3. The lower part of the heat transfer plate 21 to be bent and extended to the lower part of the heater 15 for defrosting, and the radiant heat radiated from the heater 15 for defrosting during defrosting is efficiently transmitted to the upper part of the evaporator 10. That is to say. Evaporator 1
0 and the defrosting heater 15, the protective cover 16 is inclined forward, and the rear portion extends rearward from immediately below the back of the evaporator 10. The defrost water that has fallen to
No. 1 is to prevent the defrost water from getting wet.

FIG. 4 shows a second embodiment in which the heat transfer plate 21 described above is provided behind the evaporator 10 and another heat transfer plate 22 is provided in front of the evaporator 10. Hot plate 2
The upper part of 2 is attached to a front partition plate 24 via a heat insulating material 23, and the lower part is bent and extended to the front of the heater 15 for defrosting, and a plurality of through-holes as shown in FIG. Pores 25 are formed. The ventilation holes 25 are for passing cool air returning to the evaporator 10 from the cool air recirculation paths 6a and 6b during the cooling operation.

[0012]

As described above, if the refrigerator is provided with the heat transfer plate as described above, the heat of the defrost heater is efficiently transferred to the evaporator by the heat transfer, and the flow of warm air to the evaporator is increased. And the frost that has reached the evaporator is efficiently defrosted,
By shortening the defrosting time, an increase in the internal temperature during defrosting is suppressed, and power consumption is reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a schematic configuration of a refrigerator according to the present invention and a conventional example.

FIG. 2 is an enlarged side sectional view of a main part showing a first embodiment according to the present invention.

FIG. 3 is an enlarged perspective view of a main part showing a first embodiment based on the present invention.

FIG. 4 is an enlarged side sectional view showing a main part of a second embodiment according to the present invention.

FIG. 5 is an enlarged perspective view of a main part showing a second embodiment according to the present invention.

FIG. 6 is an enlarged side sectional view of a main part of a refrigerator showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator main body 5 Heat insulation partition body 6 Heat insulation partition body 6a Cold air return path 6b Cold air return path 7 Freezing room 8 Refrigeration room 9 Vegetable room 10 Evaporator 15 Defrosting heater (glass tube heater) 16 Protective cover 21 Heat transfer plate 22 Transfer Heat plate 23 Insulation material 24 Partition plate 25 Vent

Claims (4)

[Claims] 1. A heater for defrosting is disposed substantially in parallel and horizontally below an evaporator disposed behind a freezing room,
A protective cover for protecting the heater from defrost water is provided between the evaporator and the defrosting heater, and the cool air generated by the evaporator is supplied to the freezing room by a blower, and the cold room and the cold room through the cool air duct. It is supplied to the vegetable compartment and returned to the evaporator through a cool air return path formed in the heat insulating partition between the freezer compartment and the refrigerator compartment or between the freezer compartment and the vegetable compartment, and at least one of the front and rear of the evaporator In the refrigerator, a heat transfer plate is provided, and radiant heat radiated from the heater for defrosting is transferred to the evaporator at the time of defrosting. A refrigerator characterized by being bent and extended below a heater for defrosting. 2. A method according to claim 1, wherein a lower portion of the heat transfer plate provided in front of the evaporator is bent and extended to the front of the heater for defrosting, and a plurality of ventilation holes are provided in the extension surface. The refrigerator according to claim 1. 3. A protective cover disposed between the evaporator and the heater for defrosting is tilted forward, and a rear portion of the protective cover extends rearward from a back surface of the evaporator. The refrigerator according to claim 1. 4. The refrigerator according to claim 1, wherein said heat transfer plate is made of aluminum.