JPS586385A - Fan type 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] The present invention relates to a fan-type refrigerator-freezer.

In a fan-type refrigerator/freezer, the most effective method for rapidly cooling desserts, beverages, etc. stored in the refrigerator compartment is to circulate cold air while continuously contacting the desserts, beverages, etc. It is thought that this is a way to

However, in conventional fan-type refrigerator-freezers, the drive of the fan motor for cold air circulation and the drive of the compressor motor are linked, so desserts, drinks, etc. can be quickly refrigerated at the operator's discretion. It is not possible.

The reason for this is that when the compressor motor is operating, low-temperature cold air is flowing through the freezer compartment, so there is no particular inconvenience caused by operating the cold air circulation fan motor and circulating some of the cold air into the refrigerator. However, if the cold air circulation fan motor continues to operate even when the compressor motor is stopped, will the cooling occur? The cold air inside the refrigerator flows into the refrigerator, and the relatively warm air inside the refrigerator flows into the freezer, causing the temperature inside the freezer to sweat, causing the compressor motor to operate at a high rate. It depends on what happens.

When it is desired to rapidly cool food stored in a refrigerator, the present invention operates the cold air circulation fan motor continuously (quick cooling operation) for a certain period of time regardless of the operation of the compressor motor. This eliminates the shortcomings.

That is, in the present invention, the relationship between the compressor->no motor and the cool air circulation fan motor during normal operation and during rapid refrigeration operation is as shown in Table 1.

Table 1 In conventional fan-type refrigerators and refrigerators, the compressor motor and the cold air circulation fan motor are linked, so one relay can control both, but in the present invention, the compressor motor is Since it is necessary to operate the cold air circulation fan motor regardless of the operation of the fan motor, two relays are required. And this 2
When the compressor motor is operating, only the conventional relays are driven, and the remaining relays are driven only when the compressor motor is stopped and the cool air circulation fan motor is driven. This prevents unnecessary increases in power consumption.

EMBODIMENT OF THE INVENTION Hereinafter, the fan-type refrigerator-freezer of the present invention will be described in detail with reference to the accompanying drawings showing one embodiment.

Figure 1 is an electrical wiring diagram of a fan-type refrigerator/freezer, with a relay contact (RY3) connected between both terminals of the commercial alternating power supply (AC').
and the defrosting heater (La) are connected in series, and the relay contact (Ryl) and the compressor motor (Ll) are connected in series, and the relay contact (Ry2), the cold air circulation fan motor (L2), and the freezer compartment door are connected in series. The switch (SWl) and the refrigerator compartment door switch (SW2) are connected in series in this order. Then, compress the normally closed terminal of the relay contact (Ry2) with the relay contact (Ryl) → No motor (Ll)
and the freezer compartment door switch (SWl).
), interior lights (L4) (L5) are connected to the normally open terminals of the refrigerator compartment door switch (SW2), respectively, and both normally open terminals are connected to each other. Therefore, relay contact (RYl)
By switching and operating the compressor motor (Ll
) and the cold air circulation fan motor (L2), and by switching and operating the relay contact (Ry2), the cold air circulation fan motor (L2) can be driven independently of the drive of the compressor motor (Ll). I can do it.

A nermostat (SW3) for controlling the temperature of the vegetable compartment and a heater (La) for preventing the layers of the vegetable compartment from being eroded are connected in series in parallel with the relay contact (RYl). Then, the impedance of the heater (La) is changed to the impedance of the compressor motor (
The impedance of the compressor motor (Ll) is set to be sufficiently high compared to the impedance of the heater (La) to prevent the compressor motor (Ll) from operating when the heater (La) is energized.

FIG. 2 is an electrical wiring diagram of the control unit, which is the most important aspect of the present invention, including a temperature control circuit (1) and a rapid refrigeration operation control circuit (2).
), the defrosting control circuit (3), and the relay contact (Ryl
) (Ry2) (Rya), respectively.

The temperature control circuit (1) detects that the temperature inside the refrigerator has become higher than the set temperature and outputs a high level signal, and the rapid refrigeration operation control circuit (2) detects that the temperature inside the refrigerator has become higher than the set temperature. When rapid refrigeration operation is selected by It detects that the amount has reached a predetermined amount and outputs a high level signal for a certain period of time.

The relay coil (RYE) is a switching transistor (Q
5) are connected in series.

The relay coil (RYl) is connected to a switching transistor (Q
l) is connected in series. Then, connect the base terminal of the switching transistor (Ql) to the defrost control port FI!
By connecting the collector terminal of the switching transistor (Q2), which is turned on with the high level output of 1 (3), the switching transistor's (Q2) switch is switched on during defrosting operation even if the temperature inside the refrigerator exceeds the set temperature. (Ql) is prevented from conducting.

The relay coil (RY2) is the rapid refrigeration operation control circuit (2)
The switching transistor (Q8) is connected in series with the switching transistor (Q8) which is turned on by the high level output of the transistor. Then, by connecting the base terminal r of the switching transistor (Qa) to the collector terminal of the switching transistor (Q4) which is made conductive by the high level output of the temperature control circuit (1) or the defrosting control circuit (3). , compressor motor (L
1) During operation or defrosting operation, the switching transistor (Qa) is not made conductive even if rapid cooling operation is selected.

The operation of the fan-type refrigerator-freezer having the above configuration is as follows.

When defrosting operation is performed, the defrost control circuit (3) outputs a high level voltage to make the switching transistor (Q5) conductive, so that the relay contact (Rya) is switched and the defrost heater (L3) is switched on. ) to perform defrosting operation. In this case, since the switching transistors (Q2) and (Q4) are made conductive at the same time, the switching transistors (Ql, ) ( Q
a) is in a cut-off state, and the compressor motor (Ll),
Both cold air and circulation fan motors (L2) are held in a stopped state.

When defrosting operation is not being performed, the switching transistor (Q5) is in a cut-off state to cut off power to the defrosting heater (L a ), and the switching transistor (Q2) (Q4 ) is cut off, and the switching transistors (Ql) (Qa) are made conductive.

In this state, if the temperature inside the refrigerator becomes higher than the set temperature, the temperature control circuit (1) outputs a high level voltage and makes the switching transistor (Ql) conductive, so the relay contact (
Ryl) is switched and the compressor motor (Ll)2
+ energize the cooling air circulation fan motor (L2) to perform normal cooling operation. At this time, the switching transistor (Q4) is made conductive, and the rapid refrigeration operation control circuit (2)
The switching transistor (Qa) is cut off regardless of the output signal level of the relay coil (RY2).
It is possible to cut off the power supply to.

In addition, if the temperature inside the refrigerator is lower than the first set temperature in the above state, the switching transistor (Ql) is cut off, so the relay coil (RYI) is not energized, and the compressor motor (Ll) is also not energized. It doesn't work at all. Also, at this time, the switching transistor (
Q4) is also in a blocked state.

In this state, if you select the quick refrigeration operation by operating a switch, etc. not shown, the quick refrigeration operation control circuit (
2) outputs a high level signal to make the switching transistor (Qa) conductive, thereby energizing the relay coil (RY2). Therefore, the relay contact (Ry2) switches and operates the cold air circulation fan motor (L2), which allows the food, etc. in the refrigerator to be rapidly cooled by continuously bringing the cold air into contact with the food, etc. .

As described above, the present invention enables the cold air circulation fan motor to be operated independently of the operation of the compressor motor when it is necessary to rapidly cool food etc. In any case during refrigeration operation, only one relay coil is energized, so the load balance in the control section is good, and the capacity of the power supply circuit for the control section consisting of a transformer, constant voltage circuit, etc. is reduced. It has unique effects such as being able to be made smaller and further reducing power consumption.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an electrical wiring diagram of a fan-type refrigerator-freezer. Figure 2 is an electrical wiring diagram of the control unit. ■ Temperature control circuit, 2...quick refrigeration operation control circuit,
3. Defrost control circuit, T, 1. Compressor motor,
L2...Fan motor for cold air circulation, L3/Defrost heater, RYI, RY2. R1...Relay coil, RYI, R
Y2, RY3...Relay contact, Ql, Q2. ..., Q
a...Switching transistor.

Claims (1)

[Claims] In a fan-type refrigerator-freezer that operates a cold air circulation fan motor in conjunction with the operation of a compressor motor using 11 relays, a relay that operates the cold air circulation fan motor when the compressor motor is stopped and a drive means that operates the relay are provided. A fan-type refrigerator-freezer characterized in that the fan-type refrigerator-freezer is further provided with means for preventing the operation of the driving means when the compressor motor is energized and during defrosting operation.