JPS58136966A - 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 The present invention relates to a defrosting device during and immediately after rapid cooling in a refrigerator that performs rapid cooling operations such as rapid freezing or rapid refrigeration by continuously operating a compressor or the like.

Conventionally, in refrigerators equipped with rapid freezing or rapid cooling functions prior to rapid cooling, in the case of a compressor and forced ventilation system, an electric blower has also been forced to operate continuously.

On the other hand, especially in the case of a forced ventilation system, an automatic defrosting system with a set of timers that defrosts periodically by integrating a predetermined time is generally adopted, so the circuit is inevitably designed to prevent defrosting during rapid cooling operation. It is necessary to take into account.

Therefore, in general, the time integration of the defrost timer is interrupted during the rapid cooling operation, and when the rapid cooling operation is started when the rapid cooling operation is already in progress, the defrosting is temporarily interrupted and the defrosting is stopped at the same time as the rapid cooling operation ends. was being restarted. However, if you start the rapid cooling operation during defrosting as in the latter case, if you restart defrosting at the same time as the rapid cooling operation ends, the defrost will start immediately after the rapid cooling operation ends, and the temperature inside the refrigerator will rise. The temperature of items that have reached this temperature will immediately rise significantly, and especially in the case of rapid refrigeration for drinks and frozen desserts that need to be quickly cooled and served quickly, the purpose of rapid cooling will be lost if the timing of removal is missed. There is an inconvenience that it disappears. In addition, in the case of quick freezing, which preserves the freshness of fish and meat, it is common to end the quick freezing when it passes through the maximum ice crystal formation zone. In the conventional example in which the ice crystals are restarted, the object to be frozen, which has once quickly passed through the maximum ice crystal formation zone, is returned to its original state when the removal is resumed, which makes rapid freezing useless and makes it impossible to maintain freshness.

The present invention eliminates the above-mentioned drawback of the prior art by restarting defrosting after a predetermined time delay after the end of the rapid cooling operation when the rapid cooling operation is started during defrosting. It provides a reliable rapid cooling function, and one embodiment thereof will be described below with reference to the accompanying drawings.

In the figure, 1 is the refrigerator main body, a compressor 2 at the bottom,
Each is equipped with a condenser 3 on the back.

The interior of the main body 1 is divided into two compartments, an upper freezing compartment γ and a lower refrigerating compartment 8, by a partition wall 6 having an evaporator 4 and an electric blower 6 with a forced draft layer. Reference numeral 9 denotes a thermostat placed in the freezer compartment 7, which opens and closes depending on the temperature of the freezer compartment to control the compressor 2 and electric blower 6. Reference numeral 10 denotes a damper thermostat disposed at the cold air outlet of the refrigerator compartment 8, which controls opening and closing of the damper according to the temperature of the refrigerator compartment, thereby maintaining the temperature of the refrigerator compartment at a desired temperature. This damper thermostat 1o is provided with a temperature compensation heater 11 that compensates for the operation of this damper thermostat.

Reference numeral 12 denotes a timer device for removal from the register, which includes a defrosting timer motor 12a that operates in conjunction with the closing of the thermostat 9, and a driving side contact 12b' when this motor 12a accumulates a predetermined time.
13 is a bimetal thermostat that is connected to the defrosting side contact 12b'' to detect the completion of defrosting, and 14 is a bimetal thermostat that is connected to the defrosting side contact 12b'', and 14 is a defrosting switch disposed in the evaporator 4. The evaporator 4 is defrosted by energizing the heater 14. 1
Reference numeral 5 denotes a quenching switch with a built-in quenching timer mechanism, which is composed of a switch 15a having two contacts A and kl, and a motor 15b for driving the quenching timer. That is, switch 15
A contact point A constitutes a circuit that short-circuits the thermostand 9, and a contact point A constitutes a circuit that short-circuits the thermostand 9, while the quenching timer drive motor 1 is connected via the contact point A.
6b constitutes a circuit that starts integration. Further, this quenching switch 16 is configured such that when the quenching timer driving motor 15b accumulates a predetermined time, first only the A contact is opened via a Tom board, etc., and then the B contact is opened after a delay of a predetermined time. ing. 16 is a normally closed contact 16a and this contact 16
An electromagnetic relay (
The suction coil 16b is connected in parallel with the quenching timer driving motor 15b via the contact B, and the normally closed contact 16a is connected to the bimetal thermostat 13. Defrost heater 1
Connected via 4.

In this configuration, when a rapid cooling operation is started during a normal cooling operation, when the switch 15a of the rapid cooling switch 15 is operated, the A, B and contacts are closed, and the thermostand 9 is short-circuited via the A contact. The compressor 2 and the electric blower 6 are operated continuously, the B contact is valved, and the quench timer drive electric motor 1115b starts integration, and at the same time the electromagnetic relay 16 is activated.
The defrosting timer electric motor 12
Since no electricity is applied to a and the defrosting integration is interrupted during the rapid cooling, the defrosting does not start during the rapid cooling. On the other hand, when the rapid cooling operation is started during defrosting, the A and B contacts of the rapid cooling switch 16 are closed, and the changeover switch 12b of the defrosting timer 12 is switched to the defrosting side contact 12b'' via the A contact. The compressor 2 and the electric blower 6 are operated continuously even if the change is made.Also, when the quenching timer driving motor 15b starts integration via the B contact, the coil 16b of the electromagnetic relay 16 is energized to open the normally closed contact 16a. Then, in order to open the defrosting circuit, power supply to the defrosting heater 14 is stopped and defrosting is interrupted.

After that, when the quenching timer drive electric motor 15b has accumulated a predetermined quenching time, only the A contact is opened and the compressor 2
, the continuous operation of the electric blower 5 is canceled to end the rapid cooling, but since the B contact is opened after a predetermined time delay, the interrupted defrosting is restarted after a predetermined time delay.

As is clear from the above explanation, the present invention has a circuit in which the integration of the defrosting timer is stopped during the rapid cooling operation so that no division is performed during the rapid cooling, and when the rapid cooling is started during the defrosting operation, the circuit is temporarily removed. Although the defrosting is interrupted, a delay circuit is configured so that the defrosting does not resume for a predetermined period of time even after the rapid cooling operation ends, so the defrosting starts after the freezing and cooling reaches a sufficiently low temperature and stabilizes, as in the conventional case. Immediately after the rapid cooling ends, defrosting is restarted, and the temperature of the once frozen and cooled items immediately rises.The effect of soil is very large.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a refrigerator according to an embodiment of the present invention, and FIG. 2 is a schematic electrical circuit diagram of the refrigerator. 2... Compressor, 4... Evaporator, 9...
...Thermostat, 12 ... Defrost timer device, 14 ... Defrost heater, 15 ... Fist ... Rapid cooling switch, 16 ... Electromagnetic relay ( switch). Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure/-

Claims (1)

[Claims] A thermostat that controls the operation of a compressor, a defrost heater that removes frost from the evaporator, and a defrost timer device that integrates a certain amount of time and periodically energizes a defrost circuit that includes the defrost heater. and a quenching switch that short-circuits the thermostat for a predetermined period of time and stops energizing the timer device, and a switch that opens the defrosting circuit in conjunction with closing of the quenching switch,
The refrigerator is configured such that the rapid cooling switch is configured to close the defrosting circuit switch after a short circuit of the thermostat is delayed by a predetermined period of time.