JPH0154631B2 - - Google Patents

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, drinks, etc. stored in the refrigerator is to circulate cold air while continuously contacting the desserts, drinks, etc. It is believed that 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 the operator cannot freely quickly refrigerate desserts, drinks, etc. Can not. 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 even if the cold air circulation fan motor is operated and some of the cold air is circulated inside the refrigerator. However, if the cold air circulation fan motor continues to operate even when the compressor motor is stopped, the cold air inside the freezer will flow into the refrigerator, and conversely, the relatively warm air inside the refrigerator will flow into the freezer. This is because the operating rate of the compressor motor increases because the temperature inside the freezer increases. The present invention allows the cold air circulation fan motor to operate continuously (quick cooling operation) for a certain period of time, regardless of the operation of the compressor motor, when it is desired to rapidly cool food stored in the refrigerator. This eliminates the shortcomings. That is, in the present invention, the relationship between the compressor motor and the cool air circulation fan motor during normal operation and during rapid refrigeration operation is as shown in Table 1.

[Table] In conventional fan-type refrigerator-freezers, the compressor motor and cold air circulation fan motor are linked, so one relay can control both. Since it is necessary to operate the cool air circulation fan motor independently of the operation of the fan motor, two relays are required. Regarding the drive of these two relays, when the compressor motor is operating, only the conventional relay is driven,
Unnecessary increases in power consumption are prevented by driving the remaining relays only when the compressor motor is stopped and the cold air circulation fan motor is driven. Below, regarding the fan type refrigerator-freezer of the present invention,
An embodiment will be described in detail with reference to the accompanying drawings. Figure 1 is an electrical wiring diagram of a fan-type refrigerator/freezer, with a relay contact between both terminals of the commercial AC power supply.
Connect Ry ₃ and defrost heater L ₃ in series,
Relay contact Ry ₁ and compressor motor L ₁ are connected in series, and relay contact Ry ₂ , cold air circulation fan motor L ₂ , freezer compartment 4 door switch SW ₁ , and refrigerator compartment 5 door switch SW ₂ are connected in series in this order. Connected. Then, connect the normally closed terminal of relay contact Ry ₂ to the connection point between relay contact Ry ₁ and compressor motor L ₁ , and connect the interior light L to the normally open terminal of freezer compartment door switch SW ₁ and refrigerator compartment door switch SW ₂ , respectively. ₄ , L ₅
and both normally open terminals are connected together. Therefore, by switching the relay contact Ry ₁ , the compressor motor L ₁ and the cold air circulation fan motor L ₂ can be driven, and by switching and operating the relay contact Ry ₂ , the cold air circulation fan motor L ₂ can be driven. can be driven independently of the drive of compressor motor _L1 . A thermostat SW ₃ for controlling the temperature of the vegetable compartment and a heater L ₆ for preventing the vegetable compartment from getting too cold are connected in series in parallel with the relay contact Ry ₁ . and,
The impedance of the heater _L6 is set to be sufficiently higher than the impedance of the compressor motor _L1 to prevent the compressor motor _L1 from operating when the heater _L6 is energized. FIG. 2 is an electrical wiring diagram of the control unit, which is the most important aspect of the present invention, and includes a temperature control circuit 1, a rapid refrigeration operation control circuit 2, a defrosting control circuit 3, and the relay contacts.
It is composed of relay coils RY1, _RY2 , and _RY3 that switch and operate Ry1, Ry2 _, and Ry3, 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 controls the rapid refrigeration operation by operating a switch (not shown). is selected, a high level signal is output for a certain period of time, and the defrosting control circuit 3 detects when the operating time of the compressor motor _L1 has reached the specified time or when the amount of frost has reached the specified amount. It detects when something has happened and outputs a high level signal for a certain period of time. The relay coil RY3 is connected in series with a switching transistor _Q5 which is turned on by the high level output of the defrosting control circuit 3. The relay coil RY1 is connected in series with a switching transistor _Q1 which is turned on at the high level output of the temperature control circuit 1. By connecting the base terminal of the switching transistor Q ₁ to the collector terminal of the switching transistor Q ₂ which is turned on by the high level output of the defrosting control circuit 3, the inside of the refrigerator can be controlled during the defrosting operation. Even if the temperature exceeds the set temperature, the switching transistor _Q1 is prevented from becoming conductive. Relay coil RY2 is rapid refrigeration operation control circuit 2
It is connected in series with a switching transistor _Q3 which is turned on at the high level output of Q3. Then, the base terminal of the switching transistor _Q3 is connected to
Switching transistor _Q4 conductive at high level output of temperature control circuit 1 or defrost control circuit 3
By connecting _the collector terminal of the
Even if rapid refrigeration operation is selected, the switching transistor _Q3 is not made conductive. The operation of the fan-type refrigerator-freezer having the above configuration is as follows. When performing defrosting operation, the defrosting control circuit 3 outputs a high level signal to make the switching transistor _Q5 conductive, so the relay contact
Ry ₃ is switched and energized to defrost heater L ₃ to perform defrosting operation. In this case, since switching transistors Q ₂ and Q ₄ are made conductive at the same time,
switching transistor regardless of the output signal level of temperature control circuit 1 and rapid refrigeration operation control circuit 2.
Q ₁ and Q ₃ are cut off, and the compressor motor
Both L ₁ and cold air circulation fan motor L ₂ are held in a stopped state. When defrosting operation is not being performed, switching transistor _Q5 is in a cut-off state to cut off the power to defrost heater _L3 , contrary to the above.
Switching transistors Q ₂ and Q ₄ are cut off, and switching transistors Q ₁ and Q ₃ 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 signal and makes the switching transistor _Q1 conductive.
Relay contact Ry ₁ switches and operates, driving compressor motor L ₁ to cool cooling chamber 6 by cooler 7, and energizing cold air circulation fan motor L ₂ to rotate fan 8 to cool the cold air. The freezing compartment 4 and the refrigerator compartment 5 are cooled by circulating the cold air between the compartment 6 and the freezing compartment 4 and dividing a part of the cold air between the freezing compartment 4 and the refrigerator compartment 5. In addition, at this time, the switching transistor
By making _Q4 conductive, the switching transistor _Q3 can be turned off regardless of the output signal level of the rapid refrigeration operation control circuit 2, and the current supply to the relay coil RY2 can be cut off. In addition, if the temperature inside the refrigerator is lower than the set temperature in the above condition, the switching transistor
Since _Q1 is cut off, relay coil RY1 is not energized, and therefore the compressor motor
L ₁ also doesn't work at all. Further, at this time, switching transistor _Q4 is also in a cut-off state. In this state, if the quick refrigerating operation is selected by operating a switch or the like (not shown), the quick refrigerating operation control circuit 2 outputs a high level signal to make the switching transistor _Q3 conductive and energize the relay coil RY2. Therefore, the relay contact Ry ₂ switches and operates the cold air circulation fan motor L ₂ , thereby rapidly cooling the food, etc. in the refrigerator by bringing the cold air into continuous contact with the food, etc. can. As described above, the present invention can operate the cold air circulation fan motor independently of the operation of the compressor motor when food etc. in the refrigerator needs to be cooled rapidly. In any case during rapid 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. In addition, the switching relay connected to the fan motor circuit is placed on the normally closed contact side while the compressor motor is driving, and the fan motor circuit is closed in this state, so the switching relay is not driven. This eliminates the need to energize the relay coil, which has unique effects such as reducing power consumption.

[Brief explanation of drawings]

The drawings show an 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 section. FIG. 3 is a longitudinal cross-sectional view of a main part of the fan-type refrigerator-freezer according to the present invention. 1...Temperature control circuit, 2...Quick refrigeration operation control circuit, 3...Defrosting control circuit, _L1 ...Compressor motor, _L2 ...Cold air circulation fan motor, _L3 ...
... Defrost heater, RY1, RY2, RY3 ... Relay coil, Ry ₁ , Ry ₂ , Ry ₃ ... Relay contact, Q ₁ ,
Q ₂ ,...,Q ₆ ...Switching transistor.

Claims (1)

[Claims] 1 In a fan-type refrigerator-freezer in which a relay that operates depending on the internal temperature is connected in series to a parallel circuit of a compressor motor and a cold air circulation fan motor, the cold air circulation fan motor is connected to the relay side. A switching relay that switches between a normally closed contact and a normally open contact that connects to the power supply without going through the relay side is connected, and the switching relay is operated to the normal contact side for a certain period of time by arbitrary operation to control the fan motor for cold air circulation. The present invention is characterized by providing a drive means for connecting the compressor motor to a power source without going through a series relay of the compressor circuit, and a blocking means for blocking the operation of the drive means when the compressor motor is energized and during defrosting operation. A fan-type refrigerator/freezer.