JPS60277A - Controller for defrostation - 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] Conventionally, in a cooling device that employs the heater defrost method, in order to ensure defrosting using a defrost heater,
It is necessary to finish defrosting at a certain high temperature of the entire cooler, which may cause the low-pressure side pressure in the refrigeration cycle to rise and cause problems in restarting the refrigeration cycle after unboxing. Ta.

The present invention solves this problem in a very simple way, and one embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is a cooling circuit diagram of the cooling system, where 1 is a compressor, 2
is a condenser, 3 is a dryer, 4 is a pressure reducing tube, 5 is a cooler,
6 is an accumulator, which constitutes a continuous cooling cycle in an annular manner. The cooler 5 is provided with a defrosting heater, which will be described later, and is energized during defrosting.

Next, the electric circuit of the above embodiment will be explained with reference to FIG. 7 senses the temperature inside the refrigerator and turns the cooling cycle ON-OF.
F A thermostat to control, 8 is a defrosting control timer, a timer motor 9 and a single-pole double-throw changeover switch 10
: Constructed. The changeover switch 1o has one section 10.
a to switch between the cooling side contact 10b and the defrosting side contact 10c. The other piece 10d is in contact with the contact 10e during cooling. 11 is a bimetal thermometer for detecting the end of defrosting, and 12i is a fan motor for circulating cold air inside the refrigerator, which is connected in series with the bimetal thermometer 13 for detecting the outlet temperature of the cooler 6, which turns off at 6℃ or lower, for example, 0NL-6℃ or lower. It is connected in parallel with the motor 9. This parallel circuit is connected in series with the defrosting heater 14 and wired between the power supplies. A bypass circuit connected to a contact 10e between the fan motor 12 and the thermostat 13 is formed.

1- In the circuit described above, the cooling operation is performed when the intercept 10a is the contact point 1.
Since the cross section 10d connected to the contact point 10e connects to the contact point 10e, the compressor 1 is energized and operated. At this point, F/motor 12. The timer motor 9 is operated depending on the resistance ratio with the heater 11, and the heater 14 does not generate heat. When the cooling operation reaches a certain period of time, the cutter 10a switches to the contact 10c, and the switched cutter 10d is also turned off from the contact 10e, releasing the bypass circuit of the bimetal 13, and defrosting is started by the circuit of the bimetal 11° heater 14. 2), the fan motor 12. The timer motor 9 stops. Defrosting is completed and bimetal 11
When reaches a certain temperature (approximately 10° C.), the contact point of bimetal 11 is turned OFF, and at this time, the cooler outlet temperature detection bimetal 13. Fan motor 12. Timer motor 9 and heater 1
The heater 14 stops generating heat and the timer 9 starts operating. Also, at this time, if the outlet temperature of the cooler 5 has reached the set temperature (approximately 5°C or more) lower than the operating temperature of the bimetal 11 for detecting the end of residual frost, the bimetal 13
is ON+, if the fan motor 10 also restarts operation or the cooler outlet width is lower than 5°C, the bimetal 13 is turned O.
The fan motor 121/i does not operate due to the FF state.

When the fan motor 12 is operated prior to the cooling operation,
In the no-frost type, where the freezer compartment and cooler 5 are completely separated, the freezer compartment is maintained at a sufficiently low temperature even during defrosting, so the low-temperature air from the freezer compartment circulates to the cooler 5, lowering the temperature and creating a low pressure. After a certain period of time (approximately 1 to 2 minutes), the intercept 10a changes to the contact point 10, which reduces the side pressure.
Since the fan motor 12 cools the cooler 6 only when the temperature of the cooler 6 is high at the time of switching to mode b, the compressor 1 can be started smoothly when cooling is resumed.

Cooling resumes and the cooler 5 is sufficiently cooled (below -5°C)
The bimetal 13 is turned off, but the fan motor 12 has the timer section 10d connected to the contact 10e.
A bypass circuit for the bimetal 13 is formed and operation continues.

As described above, the defrost control device of the present invention is configured to operate the fan motor in advance of the cooling operation after defrosting depending on the temperature of the cooler, making it easy to start the compressor after defrosting. In addition, when the load on the cooler is light, the fan motor is not operated in advance, which has the effect of minimizing the temperature rise in the freezer compartment.

[Brief explanation of drawings]

FIG. 1 shows a refrigeration cycle diagram of a defrosting control device according to an embodiment of the present invention, and FIG. 2 shows its electric circuit diagram. 6...Cooler, 8...Timer, 12
...Fan motor, 14...Defrost heater.

Claims (1)

[Claims] It has a cooler equipped with a defrosting heater, a fan motor that circulates electricity from the cooler indoors, and a timer that controls defrosting, and only when the temperature of the cooler after defrosting is higher than a predetermined temperature. The present invention relates to a cooling device constituting a refrigeration cycle of a refrigerator, etc., in which the operation of the fan motor is performed in advance of the cooling operation after defrosting, and in particular, the present invention relates to a cooling device constituting a refrigeration cycle of a refrigerator, etc., and in particular to a starting load after defrosting in a heater defrost method for defrosting a cooler. The aim is to reduce the temperature increase in the freezer compartment, and also to minimize the rise in temperature in the freezer compartment.