JPH0627605B2 - Refrigerator with thawing room - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator having a thaw chamber using a high frequency generator, and more particularly to defrost control of frost attached to a cooler.

2. Description of the Related Art In recent years, the frozen food market has significantly expanded into frozen foods, and as a defrosting method when cooking frozen foods, it is required to thaw quickly without impairing the taste of foods.
There is thawing using high frequency as the means.

On the other hand, the defrosting method of the cooler integrates the operating time of the compressor with a timer regardless of whether it is thawed, and when the integrated time reaches the set value, the heater is energized and the heat defrosts the cooler. I was going. In addition, an air passage was constructed in which the cool air returned from the cooler to the cooler through the defrosting chamber by the fan motor.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned configuration, water vapor generated at the time of thawing adheres to the cooler as frost, and when thawing is frequently performed, or food having a high water content is thawed. For example, even if a large amount of frost adheres to the cooler and the cooling capacity is insufficient, the accumulated time of the compressor has not reached the specified value yet, so it is not defrosted and the refrigerator or freezer There are problems that the temperature rises and abnormal frosting occurs in the refrigerator, causing fan lock and the like.

In view of the above problems, the present invention prevents the lack of cooling capacity of the refrigerator due to abnormal frost formation on the cooler due to thawing, whatever the condition of thawing, and cools the refrigerator to an appropriate temperature,
Further, the present invention provides a refrigerator with a thawing chamber capable of preventing abnormal frost formation in the refrigerator.

Means for Solving the Problems In order to solve the above problems, a refrigerator with a defrosting chamber according to the present invention includes a timer device that individually integrates an operating time of a compressor and an operating time of the high frequency generator, and the timer device. And a defrost control device that performs defrost control according to an output signal from the device.

Operation According to the present invention, the operation of the compressor and the high-frequency generator is individually integrated by the above-described configuration, and when the integrated value reaches the set value, the defrost control device defrosts the cooler, so that cooling by defrosting is performed. It is possible to prevent abnormal frost formation on the vessel.

Therefore, it is possible to always keep the refrigerator at an appropriate temperature and prevent abnormal frost formation in the refrigerator.

Embodiment A refrigerator with a thawing compartment according to an embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a refrigerator body, which is composed of an outer box 2, an inner box 3 and a foamed heat insulating material 4 filled between these boxes, and a top plate 5a and a bottom plate 5b.
The partition wall 5 formed of the heat insulating material 5c divides and forms the freezer compartment 6 in the upper part and the refrigerating compartment 7 in the lower part. Further, a cooler 8 for the refrigeration cycle and a blower 9 for forced ventilation are provided behind the freezer compartment 6. Reference numeral 10 is a refrigerating compartment temperature control device provided behind the top of the refrigerating compartment 7, and 11 is a thawing compartment provided in the top of the refrigerating compartment 7, which is a bottom plate 5b of the partition wall 5.
Is a top plate, and is divided into a substantially hermetically sealed state by the bottom plate 12 and the door plate 13, and is in communication with the refrigerating compartment temperature control device 10 in opposition thereto. Reference numeral 14 is a damper thermostat for adjusting the amount of cold air to the refrigerating compartment 7, and 15 is a damper thermostat for adjusting the amount of cool air to the defrosting compartment 11, both of which are provided in the refrigerating compartment temperature control device 10. Also, 16
Is a cold air discharge passage to the refrigerating compartment 7, and 17 is a cold air discharge port.
Reference numeral 8 denotes a cold air discharge passage to the thawing chamber 11, and reference numeral 19 denotes a cold air discharge port thereof, which are all integrally formed in the refrigerating compartment temperature control device 10.

Reference numeral 20 denotes a ventilation duct, one end of which is opened to the discharge side of the forced ventilation fan 9 and the other end of which is branched by a branching port 21, one of which is used as the damper thermostat 14 for the refrigerating chamber and the other of which is used as the thawing chamber. The opening is opposed to the damper thermostat 15 for. Reference numerals 22, 23, and 24 denote suction passages of the freezing compartment, the refrigerating compartment, and the thawing compartment, respectively, which are relative to the lower end portion of the cooler 8 through the freezing compartment suction opening 25, the refrigeration compartment suction opening 26, and the thawing compartment suction opening 27, respectively. And communicate with each other. Reference numeral 28 denotes a cavity formed of a high-frequency reflecting material such as metal forming the inner wall surface of the thawing chamber 11, and a door punching plate 29 that reflects radio waves is attached to the front surface of the cavity integrally with the door plate 13. Reference numeral 30 denotes a choke dielectric for preventing electric wave leakage, which is provided on the entire circumference of the door plate 13. The cool air ventilation holes 3 are provided on the rear wall and the front surface of the ceiling wall of the cavity 28.
1 is provided. The cold air ventilation hole 31 has a diameter sufficiently smaller than 1/10 of the wavelength λ of the high frequency used for thawing. Therefore, these holes show a very large impedance to the radio wave of that frequency, so that the cold air vents 3
High frequency leakage from 1 is very small. 32 is a freezer 6
A thermostat provided inside controls the operation of the compressor 33 and the fan motor 9.

A high frequency generator 35 is also placed in the machine room 34 in which the compressor 33 is placed, and high frequency radio waves are guided to the decompression chamber 11 by the waveguide 36.

In such a configuration, the cool air generated in the cooler 8 during normal cooling is supplied into the freezing chamber 6 by the blower 9 to cool the freezing chamber 6 and is collected from the freezing chamber suction port 25 and passed through the freezing chamber suction passage 22. It is returned to the cooler 8. Simultaneously with this, after being controlled to an appropriate amount from the cold air discharge passage 16 and the discharge port 17 to the refrigerating chamber 7 through the ventilation duct 20 and the damper thermostat 14, on the other hand, it is recovered from the refrigerating chamber suction port 26 and sucked in the refrigerating chamber suction port 26. It is returned to the cooler 8 through the passage 23, and on the other hand, the branch port 21 provided in the ventilation duct 20.
After being branched from the cold air discharge passage 18 and the cold air discharge opening 19 via the damper thermostat 15 in an appropriate amount and recovered, it is collected from the defrosting room suction opening 27 and then cooled through the defrosting room suction passage 24. Returned to.

Therefore, the water vapor generated from the thawed food also reaches the cooler 8 through this path and is frosted there to reduce the cooling capacity.

Next, the electric circuit will be described.

37 is a commercial AC power supply. Reference numeral 32 is a thermostat, which opens when the temperature inside the refrigerator becomes equal to or lower than a predetermined temperature. 38 is a relay that is switched by a signal from a frost control device 39, which will be described later, and a normally open contact 38a is connected in series with a defrosting heater 40 of the cooler 8 and a bimetal thermostat 41 for detecting defrosting completion, A compressor 33 is connected in series to the normally-closed contact 38b, and an in-compartment agitation fan motor 9 is connected in parallel with the compressor 33. 42 is a decompression switch.

Next, the defrost control device 39 will be described. Defrost switch 4
2 and the ground resistance 43 are connected to the input terminal A of the timer device 44, the connection portion of the compressor 33 and the fan motor 9 is connected to the input terminal B, and the defrosting completion detection for detecting the contact opening of the bimetal thermo 41 is detected. The output signal of the circuit 45 is used as an input terminal R for receiving the R input, and the output terminal C is connected to a driver transistor 48 of a high frequency generator driving relay 47 via a resistor 46. Reference numeral 49 denotes a defrosting start signal which is the other output terminal D of the timer device 44.
An SR flip-flop circuit that changes its state by using the input and the output signal of the defrosting end detection 45 as the R input, and 30 is a transistor that drives the relay 38 by the output 49a of the SR flip-flop circuit 49.

The operation of the above configuration will be described. When the thawing switch 42 is pushed, the timer device 44 is activated, the C output terminal becomes High level during the thawing time, and the transistor 4
8 is turned on, the high frequency generator driving relay 47 is turned on, and the high frequency generator 35 operates. The operation is repeated by pushing the defrosting switch 42, and the operating time of the high frequency generator 35 is accumulated in the timer device 44.

On the other hand, the compressor 3 dominated by the thermostat 32
The operating time of 3 is also integrated from the input terminal B by the timer device 44 independently of the operating time of the high frequency generator 35.

If the operation cumulative time of the high frequency generator 35 reaches a predetermined value before the operation cumulative time of the compressor 33 reaches a predetermined value due to frequent thawing, the timer device 4
4, the defrosting start signal is input to the SR flip-flop circuit 49 to enter the set state, and the transistor 50 is turned on.
Then, the relay 38 is turned on. That is, the normally closed contact 38b opens, the normally open contact 38a closes, the compressor 33 and the fan motor 9 are disconnected from the tributary power source 37, and the cooling operation is stopped.
The cooler defrosting heater 40 is connected to a power source. Then, the temperature of the cooler 8 rises, and the temperature rises to the bimetal thermo 4
When the value exceeds the set value of 1, the bimetal thermostat 41 is opened and the defrosting ends. At the same time, the defrosting end detection circuit 45 that detects the opening of the contact of the bimetal thermo 41 is input to the SR flip-flop circuit 49 to enter the reset state, and the relay 38 is turned off.
a is opened and the normally closed contact 38b is closed. That is, the compressor 33 and the fan motor 9 are again connected to the power source 37 to start the cooling operation. The defrosting end signal from the defrosting end detection circuit 45 is also input to the timer device 44, and the compressor 3
3 and the operation measurement time of the high-frequency generator 35 are also reset, and integration is performed again from zero.

On the other hand, when the operation cumulative time of the compressor 33 reaches a predetermined value before the operation time of the high frequency generator 35 reaches a predetermined value, the same operation as above is performed.

As described above, according to this embodiment, in the refrigerator in which the cool air is forcedly circulated in the refrigerator by the fan and the defrosting chamber using the high frequency generator is provided, the operating time of the compressor and the operating time of the high frequency generator are By providing a timer device that individually integrates and a defrost control device that performs defrost control by the output signal from the timer device, no matter what conditions the thawing is used, abnormal frost formation on the cooler due to the thawing It is possible to prevent insufficient cooling capacity of the refrigerator, cool the refrigerator to an appropriate temperature, and prevent abnormal frost formation in the refrigerator.

EFFECTS OF THE INVENTION As described above, the present invention is a high-frequency generator provided outside the refrigerator, a thaw chamber provided inside the refrigerator,
A waveguide for guiding high-frequency radio waves from the high-frequency generator to the defrosting chamber, a cooler, a fan motor for forcibly circulating cool air by the cooler in the refrigerator, an operating time of a compressor and an operation of the high-frequency generator. By providing a timer device that individually integrates the time and a defrost control device that performs defrost control by the output signal from the timer device, no matter what condition is used for the defrosting, abnormal adhesion to the cooler due to defrosting will occur. It is possible to prevent insufficient cooling capacity of the refrigerator due to frost, cool the refrigerator to an appropriate temperature, and prevent abnormal frost formation in the refrigerator such as fan lock.

[Brief description of drawings]

1 is a sectional view of a refrigerator with a thawing chamber according to an embodiment of the present invention, FIG. 2 is a partial sectional view of a damper thermostat for cooling the refrigerating chamber side of FIG. 1, and FIG. 3 is a thawing chamber of FIG. 4 is a sectional view of FIG. 4, and FIG. 4 is an electric circuit diagram of FIG. 1 ... Refrigerator, 8 ... Cooler, 9 ... Fan motor, 1
1 ... Thawing room, 33 ... Compressor, 35 ... High frequency generator, 36 ... Waveguide, 39 ... Defrost control device, 44 ...
Timer device, 45 ... Defrosting completion detection circuit.

Claims (2)

[Claims] 1. A high-frequency generator provided outside the refrigerator, a defrosting chamber provided inside the refrigerator, a waveguide for guiding high-frequency radio waves from the high-frequency generator to the defrosting chamber, and cooling. , A fan motor for forcibly circulating the cool air by the cooler in the refrigerator, a timer device for individually integrating the operating time of the compressor and the operating time of the high-frequency generator, and the output signal from the timer device. A defroster-equipped refrigerator, comprising: a defrost control device that controls frost. 2. The operation measurement time of the compressor of the timer device and the high frequency generator is reset by inputting a defrost end signal from the defrost control device to the timer device. Refrigerator with a thawing chamber according to claim 1.