KR0182144B1 - A refrigerator - Google Patents

Abstract

The present invention provides a compressor for compressing a refrigerant, a plurality of evaporators for generating cool air for evaporating the refrigerant from the compressor, and supplying each of the plurality of cooling chambers, and heating the respective evaporators to remove frost around the evaporator. A refrigerator having a plurality of defrost heaters requiring different operation cycles, the refrigerator comprising: a thermoswitch for intermittent power supply to the compressor to drive the compressor when the temperature of each cooling chamber is higher than a predetermined temperature; When the cumulative value of the driving time reaches the operating cycle of each defrost heater, it characterized in that it comprises a timer switch for controlling the power supply to each defrost heater in accordance with the operation cycle of each defrost heater. As a result, manufacturing cost can be reduced, and a separate control program is not required to be prepared, and thus manufacturing is simple, and defrosting operations of a plurality of evaporators having different defrost cycles can be effectively performed by mechanical control.

Description

Refrigerators with mechanical cooling control

The present invention relates to a refrigerator having a mechanical cooling operation control device.

The refrigerator has a cooling system for supplying the refrigerator compartment and the freezer compartment. The cooling system is composed of a compressor, a condenser, an evaporator, etc. The compressor receives power from an external power source to compress the refrigerant, and the evaporator generates cold air by evaporating the compressed refrigerant. The cold air generated in the evaporator is blown into the refrigerating chamber and the freezing chamber by the blowing fan. In addition, the refrigerator has a defrost heater for removing frost generated on the surface of the evaporator during the cooling operation.

In order to control such a cooling system, a refrigerator is provided with a control device including a temperature sensor and a microcomputer for measuring the temperature of the refrigerator compartment and the freezer compartment. When the microcomputer needs a cooling operation based on the temperature measured from the temperature sensor, the microcomputer drives the compressor, and cold air is generated from the evaporator according to the driving of the compressor. While the compressor is stopped and the cooling operation is stopped, the microcomputer operates the defrost heater to heat the surroundings of the evaporator. Thus defrosting of the evaporator is performed. As such, the control of the cooling system and the control of the defrost heater to perform the cooling operation is performed by the microcomputer.

However, in the conventional method of controlling the electronic cooling operation by the refrigerator and the microcomputer, a plurality of separate temperature sensors for measuring the temperature in the refrigerating chamber and the freezing chamber should be provided, and for the control of the compressor based on the temperature sensor and the control of the defrost heater Since a separate microcomputer must be installed, the manufacturing cost in the manufacture of the refrigerator is increased, and a program for performing the control operation by the microcomputer must be separately prepared.

Therefore, an object of the present invention, by controlling the cooling operation and defrosting operation by a mechanical control device, it is possible to reduce the manufacturing cost and does not require the creation of a separate control program, the refrigerator is simple to manufacture and the cooling operation control method by such a refrigerator To provide. In addition, another object of the present invention is to provide a refrigerator in which a plurality of cooling chambers in the refrigerator require different defrosting cycles, and thus control of a defrosting cycle suitable for this is possible by mechanical control.

1 is a side cross-sectional view of a refrigerator according to the present invention;

2 is a circuit diagram of a cooling operation control apparatus of the refrigerator of FIG. 1.

* Explanation of symbols for the main parts of the drawings

1: freezer 3: refrigerator

2: middle bulkhead 4: compressor

5a: freezer evaporator 5b: freezer evaporator

6a: freezer compartment fan 6b: freezer compartment fan

9a: Refrigerator chamber heater 9b: Refrigerator chamber heater

11: power supply 13: thermoswitch

30: timer motor 31: timer switch

The object of the present invention is to provide a compressor for compressing a refrigerant, a plurality of evaporators for generating cool air for evaporating the refrigerant from the compressor and supplying the refrigerant to each of the plurality of cooling chambers, and heating the respective evaporators to surround the evaporator. A refrigerator having a plurality of defrost heaters that eliminate frost and require different operation cycles, the refrigerator comprising: a thermoswitch for interrupting power supply to the compressor to drive the compressor when the temperature of each cooling chamber is higher than a predetermined temperature; And a timer switch for interrupting power supply to each defrost heater according to an operation cycle of each defrost heater when a cumulative value of a driving time of the compressor reaches an operation cycle of each defrost heater. Is achieved.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a side cross-sectional view of a refrigerator according to the present invention. The refrigerator has a refrigerating compartment 3 and a freezing compartment 1 partitioned by an intermediate partition 2 in a main body 10 of a heat insulating structure. A compressor 4 for compressing the refrigerant is installed in the lower rear portion of the main body 10. In the rear wall of the refrigerating chamber 3 and the freezing chamber 1, the refrigerant compressed by the compressor 4 is received and evaporated. The refrigerator compartment evaporator 5b and the freezer compartment evaporator 5a which are produced | generated are provided. The cold air generated by the refrigerator compartment evaporator 5b and the freezer compartment evaporator 5a is supplied to the refrigerator compartment 3 and the freezer compartment 1 by the refrigerator compartment fan 6b and the freezer compartment fan 6a, respectively. In the regions adjacent to the refrigerator compartment evaporator 5b and the freezer compartment evaporator 5a, a refrigerator compartment defrost heater 9b and a refrigerator compartment defrost heater 9a are respectively installed to perform defrosting operations of the respective evaporators 5a and 5b. The compressor 4, the refrigerating chamber fan 6b, the freezer compartment fan 6a, and each defrost heater 9a, 9b are controlled by a mechanical cooling operation control device to be described later.

2 is a circuit diagram of a cooling operation control apparatus of the refrigerator of FIG. 1. As shown in the figure, the cooling operation control apparatus according to the present invention, the power source 11, the thermoswitch 13 for intermittent between the compressor 4 and the power source 11, the compressor 4 and the thermos A first timer switch 31a interposed between the positions 13 and the first timer switch 31a for controlling the connection of the power source 11 to the compressor 4, and the first timer switch 31a and the freezer compartment heater 9a. It consists of two timer switches 31b. The freezer compartment heater 9a is connected to the power source 11 through the first timer switch 31a and the second timer switch 31b, and the refrigerator compartment defrost heater 9b is connected to the power source (1) through the first timer switch 31a. 11). In a normal state, the first timer switch 31a connects the compressor 4 and the thermo switch 13, and the second timer switch 31b maintains the off state. Fuses 32a and 32b are connected to the freezer compartment heater 9a and the refrigerator compartment heater 9b, respectively, and serve as a protector to cut off power during overcurrent.

The thermo switch 13 is turned on / off in accordance with the temperature of the refrigerating chamber 3 to interrupt the power supply 11 and the compressor 4. That is, since the first timer switch 31a is connected between the compressor 4 and the thermo switch 13 in a normal state, when the temperature of the refrigerating chamber 3 rises above a predetermined value in this state, the first timer switch 31a is connected according to this temperature. To connect the power source 11 to the compressor 4. Accordingly, power from the power source 11 is supplied to the compressor 4 so that cold air is generated through each of the evaporators 5a and 5b, and power is not supplied to the refrigerator compartment defrost heater 9b and the refrigerator compartment defrost heater 9a. do. In addition, the electric power is supplied to the refrigerator compartment fan 6b and the freezer compartment 6a at the same time as the power supply to the compressor 4, and the cold air is blown to the refrigerator compartment 3 and the freezer compartment 1. When the refrigerating chamber 3 is cooled below a predetermined temperature, the thermo switch 13 is turned off, the driving of the compressor 4 is stopped, and the cooling operation is stopped.

Each timer switch 31 is driven by a timer motor 30. At this time, each timer switch 31 operates based on the accumulated value of the compressor 4 driving time. That is, when the thermo switch 13 is in the on state, the timer motor 31 is driven, and the rotation speed of the timer motor 30 is proportional to the time that power is supplied to the compressor 4. Each timer switch 31 measures the time according to the rotation speed.

The switching drive cycle of each timer switch 31 is set to correspond to the defrost cycle required by each defrost heater 9a, 9b. For example, if the defrost cycle required by the refrigerator real defrost heater 9b is 6 hours and the defrost cycle required by the freezer defrost heater 9a is 12 hours, the switching cycle of the first timer switch 31a is set to 6 hours, The second timer switch 31b is set to 12 hours. Each timer switch 31 counts the time of a preset period, and when the counted time reaches the set time, the timer switch 31 switches by switching the switching state for the time required to perform the defrosting operation (for example, about 30 minutes). That is, the timer motor 30 repeatedly drives and stops the drive according to the on / off repetition of the thermo switch 13. When the driven time reaches 6 hours, the first timer switch 31 a is connected to the power source 11. The defrosting heaters 9a and 9b are switched so as to be connected, and the switched state is maintained for about 30 minutes. As a result, the refrigerator compartment defrost heater 9b is operated to defrost the refrigerator compartment evaporator 5b.

When defrosting is finished and the power supply to the compressor 4 is continued and the cumulative value of the compressor 4 driving time reaches 12 hours, the first timer switch 31a for switching to 6 hours and the second timer switch for switching to 12 hours 31b are all switched, whereby the refrigerator compartment defrost heater 9b and the freezer compartment defrost heater 9a both perform defrosting operations. By this process, defrosting by the operation of the compressor 4 takes place at different cycles according to the freezer compartment evaporator 5a and the refrigerator compartment evaporator 5b. In addition, since the cooling operation and the defrosting operation are performed by the thermo switch 13 and the timer switch 31 without a separate microcomputer, the manufacturing process can be simplified and the manufacturing cost can be reduced. In addition, although the timer switch 31 may be installed for each defrost heater and controlled individually, in such a case, if there is a slight error in time between the timer switches, the accumulated value of the error increases as the use of the refrigerator continues. Therefore, one side may perform defrosting and one side may perform a contradiction such as performing a cooling operation. Therefore, as shown in the circuit diagram of the present invention, by allowing each timer switch 31a, 31b to be driven by the same timer motor 30, it is possible to prevent malfunction due to accumulation of such an error.

As described above, according to the present invention, by controlling the cooling operation and the defrosting operation by a mechanical control device, the manufacturing cost can be reduced, and the production is simple because no separate control program is required, and a plurality of different defrosting cycles are provided. The defrosting operation of the evaporator can be effectively performed by mechanical control.

Claims (1)

A compressor for compressing the refrigerant, a plurality of evaporators for generating cool air for evaporating the refrigerant from the compressor and supplying the cooling chambers to the plurality of cooling chambers, and heating each of the evaporators to remove frost around the evaporator, each having a different operation cycle In the refrigerator provided with a plurality of defrost heaters that require, A thermoswitch for controlling the power supply to the compressor to drive the compressor when the temperature of each cooling chamber is higher than a predetermined temperature; And a timer switch for interrupting power supply to each defrost heater according to an operation cycle of each defrost heater when a cumulative value of the driving time of the compressor reaches an operation cycle of each defrost heater.