JPS596232Y2 - refrigerator - Google Patents

Description

[Detailed Description of the Invention] The present invention is an improved defrosting means in a cold air forced circulation refrigerator.

Defrosting in this type of refrigerator usually involves stopping the fan motor to avoid circulation of warm air into the refrigerator, and energizing a heating element provided in the cooler to complete defrosting within the cooling chamber.

However, this method takes a long time to defrost,
This method had drawbacks such as frost remaining in parts of the cooler, and was not necessarily a good method.

Therefore, this invention was developed to provide a refrigerator that can defrost in a short time and can be expected to defrost completely.
One embodiment will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a refrigerator main body, which has a machine room in which a compressor 2 is mounted at the bottom, and a door 3 is pivotally attached to the front opening.

A partition plate 4 is provided on the back wall side of the main body 1, and is divided into a cooling chamber 5 on the back wall side and a refrigerator interior 6 on the door 3 side.

A suction port 7 is formed in the lower part of the cooling chamber 5, and a discharge port 8 is formed in the upper part thereof to communicate with the inside of the refrigerator 6.

Reference numeral 9 denotes a cooler arranged vertically within the cooling chamber 5, and is equipped with a defrosting heater 10 at the bottom.

A fan motor 11 is provided facing the discharge port 8 for circulating cold air.

On the other hand, a cooler 5 is provided on the back wall facing the cooler 9 in the cooling chamber 5.
A recess 12 is formed which is longer than the length of the recess 1 .
A partition plate 13 is disposed between the recess 12 and the cooler 9, thereby forming a bypass air passage 14 between the recess 12 and the partition plate 13.

Reference numerals 15 and 16 are ribs that project from both ends of the recess 12 to slightly cover the upper and lower outlet sides and inlet sides of the cooler 9.

A defrosting fan motor 17 faces the gap between the upper end of the partition plate 13 and the rib 15, and has a smaller air volume than the fan motor 11.

Further, during defrosting, the defrosting fan motor 17 is operated after a predetermined temperature rise by a thermostat 18 provided at the upper end of the cooler 9.

Therefore, when the defrosting fan motor 17 is operated, the rib 15
, 16 due to the presence of the partition plate 13, the air circulates between the cooler 15 and the bypass air path 14 as shown by the broken line arrow.

Next, to explain the electric circuit diagram in the above structure, 19 is an internal temperature thermostat that detects the temperature inside the refrigerator 6 and turns it on and off, and is interposed between the compressor 2, fan motor 11, etc., and the power source. .

20 is a well-known defrosting timer, which includes a cooling contact 20a connecting the compressor 2 fan motor 11, and a defrosting heater 1.
0 to the defrosting contact 20b.

Reference numeral 21 denotes a defrost termination thermostat which is interposed in series with the heater 10 and which terminates the defrosting operation when the temperature of the cooler 9 rises by a predetermined value.

The defrosting fan motor 17 and thermostat 18 are connected in series to the heater 10 in parallel.

Therefore, during the cooling operation, the cooling chamber 5 and the inside 6 are forced to circulate by the fan motor 11 as shown by solid arrows in FIG. 1, thereby performing cooling.

When the cooling operation continues for a predetermined period of time, frost will adhere to the cooler 9, so the timer 20 switches the contact to the defrosting contact 20b.
The compressor 2 and fan motor 11 are stopped and the heater 10 is stopped at the same time.
energize.

As a result, the temperature of the cooler 9 rises, but when the temperature rises to a certain extent, the thermostats 1 and 18 close or the defrosting fan motor 17 operates, and the air flow between the cooler 9 and the bypass air path 14 is as shown by the broken line arrow in FIG. circulate.

Therefore, as a result of the warm air generated by the heater 10 being circulated through the cooler 9, the defrosting time is shortened and defrosting unevenness is eliminated.

Also, since the air volume of this fan motor 17 is small, the cooling chamber 5
Less amount of warm air leaks outside.

When defrosting is completed and the temperature in the cooling chamber 5 rises, the end thermometer 21 turns off the power to the heater 10 and fan motor 17, and the timer 20 restarts the cooling operation.

As is clear from the above explanation, the refrigerator of the present invention circulates the warm air from the heating element to the cooler after the temperature of the cooler rises slightly during defrosting, so the defrosting time is shortened and the cooler is defrosted. This has great practical effects, such as eliminating unevenness and minimizing the amount of warm air leaking into the refrigerator during convection by the circulation fan motor.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a refrigerator according to an embodiment of the present invention, and FIG. 2 is a schematic electrical circuit diagram of the same refrigerator. 5... Cooling chamber, 9... Cooler, 10.
... Heater (heating element), 11 ... Fan motor, 14 ... Bypass air path, 17 ...
...Defrosting fan motor, 18...Thermostat.

Claims (1)

[Scope of utility model registration request] A cooler equipped with a defrosting heating element and a fan motor for circulating cold air into the refrigerator are arranged in the cooling chamber, and a bypass air path is formed in a part of the cooling chamber that communicates between the outlet and the entrance of the cooler. In this refrigerator, a defrosting fan motor is provided in the bypass air passage with a lower air volume than the fan motor, and is operated after a predetermined temperature rise of the cooler during defrosting to cause forced convection between the bypass air passage and the cooler. .