JPS60240977A - Freezing 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 Field of Industrial Application The present invention relates to a fan motor for forcing cold air into a refrigerator, an indirect cooler, and a refrigerator with direct cooling installed inside the refrigerator. It is concerned with the control of the cooling system at the time.

Conventional configuration and its problems Inside a refrigerator with indirect cooling method using cold forced convection -7 In addition to the indirect cooler, a direct cooler is placed inside the freezer compartment, and food to be quickly frozen is stored in this area. There are known products that perform freezing.

Conventional examples are shown and explained in FIGS. 4, 5, and 6.

In FIGS. 4 and 6, reference numeral 1 denotes a refrigerator-freezer, which consists of an upper freezer compartment 1a and a lower refrigerator compartment 1b.

Reference numeral 2 denotes an indirect cooler that exchanges heat with the air inside the refrigerator, and is disposed within a dividing wall 1C between the freezing compartment 1a and the refrigerator compartment 1b. Reference numeral 3 denotes a fan motor that circulates the cold air heat-exchanged by the indirect cooler 2 into the refrigerator. 4 is a direct cooler provided in the freezing chamber 1a, and forms a part of the quick freezing chamber 4a having the direct cooler 4 as the bottom surface. Figure 6 shows a refrigeration cycle diagram, where 6 is a condenser, 6 and 7 are pressure reducing devices, and 8 is a condenser.
9 is an electromagnetic valve for switching whether the refrigerant flows into either the direct cooler 4 or the indirect cooler 2, and 10 is a compressor. In addition, 10a is a quick freezing start switch. During quick freezing, relay 10 and contact 10b open electromagnetic valve 9, and by closing electromagnetic valve 8, cold water is supplied to direct cooler 4 and indirect cooler 2. It is configured to flow a medium. On the other hand, during normal operation,
When the compressor 10 is operated by the thermostat 10c in the freezer compartment 1d, the solenoid valve 8 is opened by the relay contact 10b, and the solenoid valve 9 is closed, so that the refrigerant flows to the indirect cooler 2.

That is, the relay contact 10b is provided so as to be closed on the a side during normal operation, and closed on the b side during rapid freezing.

In such a configuration, when the power is turned on, heat is exchanged only by the indirect cooler 2 unless the quick freezing start switch 10a is pressed. In this case, indirect cooler 2
This has the disadvantage that it takes a long time for the temperature inside the refrigerator to drop, especially when the temperature inside the refrigerator is high at the time of installation.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned conventional drawbacks, and an object of the present invention is to shorten the cooling time inside the refrigerator when the power is turned on.

Structure of the Invention The present invention provides the following method: When the temperature inside the refrigerator is higher than a predetermined value when the power is turned on,
By exchanging heat with both the indirect cooler and the direct cooler, and at the same time increasing the rotation speed of the fan motor to improve heat exchange efficiency, effective cooling is achieved when the power is turned on.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 3. In Fig. 1, 5 is a condenser, 6.7 is a pressure reducing device, 8.9 is an electromagnetic valve for switching whether the refrigerant flows to direct cooler 4 or indirect cooling 2, and 1o is a compressor. , 100 is a control circuit that controls opening/closing of the electromagnetic valve 8.9 and operation/stop of the compressor 10 and fan motor 3.

FIG. 2 shows the circuit configuration of the control circuit 100.
is a comparison circuit, and one end of the input of this comparison circuit 110 is connected to a thermistor 12 installed in the freezer compartment 1a to sense the temperature of the freezer compartment 1a and a slide volume 13 that adjusts the temperature of the freezer compartment 1a. A voltage is input, and a resistor 14 is connected to the other end to control the output of the comparator circuit 11.
15, 16, and 17 are input. On the other hand, the output of the comparison circuit 11 is outputted via the inverter circuit 18.
It is connected to one end of the R circuit 19. Further, a connecting portion between the quick freeze start switch 20 and the grounding resistor 21 is connected to an input terminal 22a of a timer device 22, and a high level signal is outputted to an output terminal 22b of the timer device 22 for, for example, 9° minutes. An output terminal 22b of this timer device 22 is connected to one input terminal of an OR circuit 23.

Further, the voltage at the connection point between the thermistor 12 and the resistor 25 similar to that of the comparator 11 is input to one end of the input of the comparator circuit 24, and the resistors 26 and 27 are connected to the other end to control the output of the comparator circuit 24. A reference voltage according to .28.29 is input. On the other hand, the output of the comparison circuit 24 is transferred to the inverter circuit 30.
One is connected to one end of the OR circuit 23, and at the same time, one is connected to the base of a driver transistor 38 of a fan motor rotation speed control relay 39 via a resistor 37. Incidentally, the capacitors 40 and 41 determine the rotation speed of the fan motor 3. On the other hand, one side of the output of the OR circuit 23 is connected via a resistor 31 to a drive relay 32 for switching the solenoid valve 8.9. The other end is connected to the base of a driver transistor 35 of a compressor drive relay 36 via an OR circuit 19 and a resistor 34. 42 operates the electromagnetic valve 8.9 at a higher predetermined temperature than the normal operation control of the compressor 10 in the comparator circuit 24, and at the same time changes the rotation speed by switching the condenser 40.41 of the fan motor 3. This is a forced freezing device that increases the temperature.

In the above configuration, during normal operation, the compressor 10 to the condenser 6
Cooling flows to the electromagnetic valve 8, the pressure reducing device 6, the indirect cooler 2, and the compressor 1o. On the other hand, during rapid freezing operation and when the power is turned on, the refrigerant is configured to flow from the compressor 10 to the condenser 6 to the solenoid valve 9 to the pressure reducing device 7 to the direct cooler 4 to the indirect cooler 2 to the compressor 10. .

That is, when the temperature inside the refrigerator is higher than a predetermined value during normal operation, the resistance value of the thermistor 12 for detecting the temperature in the freezer compartment becomes small, the output of the comparison circuit 11 becomes a LOW level (hereinafter simply referred to as L), and the inverter circuit 12 High level (
(hereinafter simply referred to as H), the relay 36 is operated by the transistor 35 via the OR circuit 19, and its contact 36a.

36b is closed and the compressor 10 operates. At this time, the fan motor 3 is operated at the normal rotation speed by the rotation speed determining capacitor 4°, and the solenoid valve 8 is opened. That is, when the resistance value of the resistor 26 is set so that the output of the comparator circuit 24 becomes H, the output is converted to L by the inverter circuit 3o, so the transistor 38 maintains the OFF state, and the contact 39a of the relay 39 closes to the a side. Therefore, the capacitor 4o acts on the operation of the fan motor 3.

Similarly, since the transistor 31 is off and the relay 32 does not operate, its contact 32a is closed to the a side!
As a result, the solenoid valve 8 opens.

On the other hand, when the internal temperature of the freezer compartment 1a becomes lower than the predetermined value, the output of the comparator circuit 11 becomes H, and the transistor 36 turns off L, and the relay contact 36a.

36b is opened, the compressor 10 and fan motor 3
stops.

Next, when you press the quick freezing start switch 20, the timer device 2
2 operates, the output terminal becomes H during the rapid freezing time (T minutes), and the transistor 33 turns on L through the OR circuit 23.
, the relay 32 operates and its contact 32a closes to the b side, and at the same time the solenoid valve 9 is opened, the transistor 35 is turned on via the OR circuit 19, and the compressor 1o is operated.

Next, when the power is turned on, if the temperature of the thermistor 12 that senses the temperature inside the freezer compartment 1a is higher than a predetermined value (for example, when the temperature in the freezer compartment 1a
(when the internal temperature is 0°C or higher), the output of the comparator circuit 24 of the forced quick freezing device 42 becomes L, which is converted to H by the inverter circuit 3o, and then passed through the OR circuit 23, in the same way as during the quick freezing. When the compressor 1o is turned on, the solenoid valve 9 is turned on.
L, and at the same time transistor 38 turns on, fan motor rotation speed control relay 39 turns on L, its contact 39
When a is closed to the b side and the capacitor 41 is activated, the rotation speed of the fan motor 30 increases.

When the temperature inside the freezer compartment 1a falls below a predetermined value that is slightly higher than the temperature at which the compressor 1o is stopped, the output of the comparison circuit 24 becomes H, the transistors 33 and 38 turn oHl, and the solenoid valve 9 closes, at the same time the fan The rotational speed of the motor 3 becomes the normal rotational speed, and from this point on, the control for normal operation begins.The operation and effects of this embodiment will be explained with reference to FIG. 3, while comparing them with the conventional example. Conventionally, when the power was turned on, heat exchange was performed only in the indirect cooler, so it took 12 hours as shown by the solid line, but in the present invention, the rapid freezing mode is forced and at the same time the rotation speed of the fan motor 3 is increased. By utilizing the workload of both the indirect cooler 2 and the direct cooler 4 and increasing the heat exchange efficiency, the time required for the conventional T minutes can be reduced to 11 minutes.

On the other hand, the temperature of the freezer compartment 1a once reaches the predetermined temperature T.

When the temperature drops below ℃, it enters normal operation mode.

In FIG. 3, A shows the characteristics of the conventional example, and B shows the characteristics of the embodiment of the present invention.

Effect of the invention 10 - As is clear from the above explanation, according to the present invention, when the power is turned on, even if the quick freezing operation is not in progress, the refrigerant is forced to flow directly into the cooler and at the same time the rotation speed of the fan motor is reduced. High,
In order to increase the heat exchange efficiency by wind, the cooling time inside the refrigerator can be shortened, and normal operation can be automatically resumed. The forced freezing time can be controlled according to the temperature inside the refrigerator, and unnecessary cooling is not performed. be effective.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle and circuit diagram according to an embodiment of the present invention, Fig. 2 is a control circuit diagram thereof, Fig. 3 is a diagram showing the state of cooling action of the present invention, and Fig. 4 is a refrigeration cycle showing a conventional example. FIG. 6 is an enlarged sectional view of the main part of the refrigerator, and FIG. 6 is a refrigeration cycle and circuit diagram thereof. 2...Indirect cooler, 3...Fan motor, 4...Direct cooler, 42...
Forced rapid freezing device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 4 Figure 5

Claims (1)

[Claims] A fan motor for forced convection of cool air into the refrigerator, an indirect cooler, a direct cooler installed in a part of the refrigerator, and a refrigerant flowing through the direct cooler during quick freezing operation, and when the power is turned on. A forced freezing device is provided that forcibly enters the quick freezing operation when the temperature inside the refrigerator is higher than a predetermined temperature and increases the rotation speed of the fan motor, and cancels the quick freezing operation when the temperature inside the refrigerator falls below the predetermined temperature. Freezer/refrigerator.