JPH0760046B2 - refrigerator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator provided with a quick freezing device for forcibly operating a compressor for a certain period of time.

2. Description of the Related Art A conventional example will be described with reference to FIGS. In the figure, reference numeral 1 denotes a refrigerator main body, which is composed of an outer box 2, an inner box 3 and a heat insulating material 4 filled between the boxes 2 and 3. Reference numeral 5 denotes a partition wall, in which a cooler 6 and a blower 7 for forced ventilation are housed, and a partition plate 8 and a back surface of the partition plate 8 are thermally conductively contacted to the front end surface of the partition plate 8 to form a surface. The high-pressure refrigerant pipe 9 of the refrigeration cycle is provided to prevent dew condensation. Further, a freezing room 10 is formed above the partition wall 5, and a refrigerating room 11 is formed below. Reference numeral 12 is a duct for guiding the cool air cooled by the cooler 6 to the freezer compartment 10 and the refrigerating compartment 11 by the blower 7, and cold air flows into the inlet of the refrigerating compartment 11 according to the temperature of the refrigerating compartment 11. A damper thermostat 13 for adjusting the quantity is provided. 14 is a refrigeration cycle compressor, 15 is this compressor
14 is a temperature detector such as a thermistor provided in the freezer compartment 10 for controlling the operation and stop of the blower 7.

Next, the control circuit will be described.

After the compressor 14 and blower 7 are connected in parallel, relay contact
Connected to power supply through 16. Reference numeral 17 denotes a temperature control device, which is provided with a temperature detector 15 such as a thermistor, resistors R ₁ , R ₂ , R ₃ and a comparison circuit including a comparator 18, an OR circuit 19, a transistor 20, and a relay coil 21. The output of 18 is connected to one input of the OR circuit 19. The output of the OR circuit 19 is connected to the base of the transistor 20, and the collector of the transistor 20 is connected to a suction relay coil 21 for opening and closing the relay contact 16. Reference numeral 22 denotes a quick freezing device, which is composed of a quick freezing switch 23 and a timer 24. The timer 24 outputs an output signal "High" (hereinafter referred to as "H") only for a certain time when the quick freezing switch 23 is turned on. Occur. The output of the timer 24 is the OR circuit of the temperature control device 17.
Connected to the other 19 inputs.

In such a configuration, when the temperature of the freezer compartment 10 is higher than the predetermined value, the resistance value R _TH of the temperature detector 15 is small, and the potential at the point A determined by the resistance value R _TH and the resistance R _1. Becomes higher than the potential at point B determined by resistors R ₂ and R ₃ ,
Since the output of the comparator 18 becomes "H", one input of the OR circuit 19 becomes "H", that is, the output also becomes "H", and the transistor 20
Turns on and the relay coil 21 becomes conductive. Then, the relay contact 16 is closed to operate the compressor 14 and the blower 7, and the freezer compartment
10. Cool the refrigerator compartment 11. After that, if the freezer compartment 10 is cooled to a predetermined temperature, the resistance value R _TH of the temperature detector 15 increases and the A potential becomes smaller than the B potential, so the comparator 18 is "Low" (hereinafter referred to as "L"). ) Generate a signal. Therefore, one input of the OR circuit 19 becomes "L", and if the quick freezing switch 23 is not turned on, the other input is also "L", and its output also becomes "L". Then, the transistor 20 is turned off, the conduction to the relay coil 21 is cut off, the relay contact 16 is opened, and the compressor 14 and the blower 7 are stopped.

Next, the case where quick freezing is performed will be described. When the quick freezing switch 23 is turned on, the "H" signal is input to the timer 24, and the timer 24 starts integrating for a predetermined fixed time and continues to output the "H" signal during that time. Therefore, one input of the OR circuit 19 is always "H" for a certain period of time, and the output of the OR circuit 19 is "H" regardless of the output of the comparator 18 of the temperature control device 17. That is, the transistor 20 is turned on, the relay coil 21 is turned on, and the relay contact 16 is closed. Then, the compressor 14 and the blower 7 are forcibly operated for a certain period of time to exert the quick freezing effect as shown in FIG.

Problems to be Solved by the Invention However, in such a configuration, as shown in FIG.
At the end of the quick freezing, the temperature of the temperature detector 15 is also extremely low because the inside of the freezing chamber 10 is maintained at a considerably low temperature, and after the quick freezing is completed, the compressor 14 and the blower 7 are stopped. Even if the temperature starts to rise, it takes a very long time to reach the temperature at which the compressor 14 and the blower 7 should be operated next. That is, during normal cooling stable operation
Although the cycle is repeated with ON / OFF time t ₁ / t ₂ min, the OFF time immediately after the end of quick freezing is t ₃ min, which is normally t ₂
If it is ≅15 min, it will be extended to about t ₃ ≅60 min, and this tendency will actually become stronger as the outside air temperature becomes lower. Therefore, for example, when the outside air temperature is 30 ° C., the compressor 14 is stopped during a long OFF time immediately after rapid freezing and the heat source to the high pressure refrigerant pipe 9 is lost, so that the cooler 6 and the freezer compartment 1
0, the surface temperature of the partition plate 8 is greatly reduced due to the influence of the low temperature source of the refrigerating room 11. For example, the surface temperature of the partition plate 8 is significantly lower than the dew point temperature T = 27.2 ° C when the relative humidity of the outside air is 85%. As a result, there is a problem that a large amount of dew condensation occurs in the peripheral part and drops as water drops. At the same time,
Refrigerating room that does not actively perform supercooling even during quick freezing
Regarding No. 11 as well, there was a problem that the room temperature greatly rises because there is no cooling source at the time of long OFF immediately after the end of quick freezing.

The present invention solves the above-mentioned problems, and an object of the present invention is to prevent dew condensation on the partition plate surface and temperature rise in the refrigerating compartment at the time of stopping immediately after the end of quick freezing.

Means for Solving the Problems In order to solve the above problems, the present invention relates to the time when the quick-freezing operation is actually performed within a certain time after completion of the quick-freezing and after interruption of the quick-freezing according to the outside air temperature. The operation of the compressor is controlled based on a predetermined stop and operation cycle.

Effect The present invention has the above-described structure, and immediately after the end of the quick freezing and immediately after the interruption of the quick freezing, the compressor is intermittently operated without a normal temperature control device at a predetermined cycle according to the time when the quick freezing is actually performed. Forced operation, shifting to control by a normal temperature control device while satisfying most of the required heating amount for the partition plate and the required cooling amount for the refrigerating room,
Prevents the formation of condensation around the partition plate and the temperature rise in the refrigerator compartment.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In addition, the same reference numerals are given to the same configurations as the conventional ones,
Detailed description thereof will be omitted and only different parts will be described.

In the figure, 25 is a quick freezing device, which is a quick freezing switch 23, an outside air temperature detecting device 26, inverters 27, 28, 29, and an AND circuit.
It consists of 30, 31, 32, 33, timers 34, 35, 36, 37, and integration timer 38. Here, the outside air temperature detecting device 26 is an outside air temperature detector such as a thermistor attached to a part of the outer shell of the main body.
It is composed of a comparator circuit including 39, resistors R ₄ , R ₅ , R ₆ , and a comparator 40. The timers 34 and 35 will be described. Both timers 34 and 35 start integrating for a fixed time at the same time when the "H" signal is input, and during that time, the output keeps generating the "H" signal. When a certain accumulated time has elapsed, this is also switched to a predetermined “L” → “H” time cycle, and after the switching, the total time including “L” and “H” has passed a certain time. It is configured to reset for the first time. In addition, input (e and g) and output (f
And h) and further i and j as reset terminals,
When the "L" signal is input, the output is reset to "L". Of these, the timer 34 is for relatively high outside air temperature, and the timer 35 is for low outside air temperature "H" / ("H" + "depending on the outside air temperature. L ")
Is changing the ratio of. The total time including "L" and "H" is also changed according to the outside air temperature. Further, the timers 36 and 37 will be described. Both timers 36 and 37 output the predetermined “L” → “H” time cycle when the “H” signal is input, and the total time including “L” and “H” is a constant time. It is configured to reset after the passage of. The timers 36 and 37 also change the ratio of "H" / ("H" + "L") in the time cycle of "L" → "H", and the total time including "L" and "H" is also changed. Changing. Next, the integration timer 38 will be described. It consists of input terminal a and output terminals b, c, d, and
Although the b output outputs the signal as it is to the input, when the "H" signal is input to the a input, the "H" signal is output from the c output for a certain period of time, and the d output is changed to " H "
The signal is output.

The output of the quick freezing switch 23 is one input of each of the AND circuits 30 and 31, and the reset input parts i and j of the timers 34 and 35.
Connected via the inverters 27, 29 to the A
Each of the ND circuits 32 and 33 is connected to one input. The A
The outputs of the ND circuits 30 and 31 are connected to the inputs e and g of the timers 34 and 35, respectively. The outputs f and h of the timers 34 and 35 merge and are connected to the input a of the integration timer 38. The output c of the integration timer 38 is the other input of the AND circuit 32, or
The output d of the integration timer 38 is connected to the other input of the AND circuit 33, and the outputs of the AND circuits 32 and 33 are respectively the timer 3
6, 37, the outputs of the timers 36, 37 and the output b of the integration timer 38 are merged and connected to the input of the OR circuit 19 of the temperature controller 17. One of the outputs of the comparator 40 of the outside air temperature detection device 26 is connected to the AND circuit 30 and the other is connected to the AND circuit 31 via the inverter 28.

In such a configuration, when the quick freezing switch 23 is closed, the "H" signal is input to one of the AND circuits 30 and 31, respectively.
Further, the AND circuits 32 and 33 are converted into "L" by the inverters 27 and 29 and input. At this time, the outside air temperature is relatively high (for example,
30 ° C.), the resistance value R _TH ′ of the temperature detector 39 of the outside air temperature detecting device 26 becomes small, and the potential at the point C determined by this resistance value R _TH ′ and the resistance R ₄ becomes the resistance R _{TH. 5} , D determined by R ₆
It becomes higher than the potential of the point, and the output of the comparator 40 becomes "H". Therefore, the "H" signal also enters the other input to the AND circuit 30, and is converted into "L" by the inverter 28 and input to the AND circuit 31. Therefore, as outputs, the AND circuit 30 becomes "H" and the AND circuit 31 becomes "L", and the timer 34 is selected. When the "H" signal is input to the timer 34, the time integration is started and the "H" signal continues to be output from the output b of the integration timer 38. Therefore, regardless of the other input, the OR circuit 19 outputs The output becomes “H” and the transistor 20
When turned on, the relay coil 21 becomes conductive. And relay contact 16
Is closed, the compressor 14 and the blower 7 are forcedly operated, and quick freezing is performed. After that, the timer 34 integrates a certain period of time, and when the quick freezing ends, the timer 34 follows the predetermined stop and operation cycle, and the timer 34 goes to "L" → "H" cycle.
Repeat the output signal of "H". It is recommended that the operating rate and the operating time / (operating time + stopping time) of this stop / intermittent cycle be set lower than the operating rate during normal stable cooling.

Next, when the outside air temperature is lower than a predetermined value (for example, 10 ° C.), the resistance value R _TH ′ of the outside air temperature detector 39 is large and the potential at the point C is lower than the potential at the point D. Therefore, the output of the comparator 40 becomes "L". Therefore AN
One input of the D circuit 30 becomes "L" and the output also becomes "L", but on the contrary, the input of the AND circuit 31 becomes "H" and the timer 31 is selected by way of the inverter 28. still,
Generally, at low outside temperatures, the stop time immediately after the end of quick freezing is particularly long, so the total time for the intermittent cycle of stop and operation is set to be long. Also, since the operating rate during normal stable cooling is different from that during high outside air temperature, the setting of the intermittent cycle operating rate is different from that during high outside air temperature so that it is lower than the operating rate during normal operation. .

Next, when the quick freezing switch 23 is opened during the quick freezing to interrupt the quick freezing operation, the output becomes "L" and the timer 34,3
The “L” signal is input to the reset terminal of 5, and the timer 34, 35
Output is "L". Inverters 27 and 29 convert it to "H" and input it to one of AND circuits 32 and 33, respectively. Also, the time since the start of quick freezing is integrated by the integration timer 38, and when the time is less than the set time, "H" is output from output c.
It is input to the AND circuit 32, the output of the AND circuit 32 becomes "H", and the timer 36 is selected. It is input to the timer 36 and a predetermined “L”, “H” intermittent cycle is output, and OR is set accordingly.
Circuit 19 becomes "L", "H", transistor 20 is OFF, ON
Then, when the transistor 20 is ON, the relay coil 21 becomes conductive and the relay contact 16 is closed. Therefore, the compressor 14 and the blower 7 are operated. When the transistor 20 is off, the relay coil 21 is not conductive, the relay contact 16 is open,
The compressor 14 and the blower 7 stop. In addition, it is preferable that the operating rate of the intermittent cycle of stop and operation is the same as that during normal operation. Also, after the quick freezing starts, if the integration timer 38 integration exceeds the set time, "H" is output from the output d of the integration timer 38.
Is output and input to the AND circuit 33, the output of the AND circuit 33 becomes “H”, and the timer 37 is selected. A predetermined "L" and "H" intermittent cycle is input to the timer 37, and the same operation is performed thereafter, the compressor 14 and the blower 7 are stopped, and the operation cycle is repeated. The operating rate of the intermittent cycle of stop and operation is preferably lower than the operating rate of normal operation.

As a result, the temperature of the partition plate surface does not fall significantly below the dew point temperature even after the rapid freezing ends at high and low outdoor temperatures and after the rapid freezing is interrupted, and during that time, the refrigerating chamber 11 also has Since an appropriate amount of cold air is supplied, the rise in the temperature of the refrigerating room can be suppressed and the desired effect can be obtained.

Effects of the Invention As is apparent from the above description, according to the present invention, the following effects can be obtained.

(1) A large amount of dew condensation around the partition plate immediately after the end of quick freezing can be uniformly prevented regardless of the change in the outside air temperature.

(2) It is possible to suppress the temperature rise in the refrigerating chamber after the completion of the quick freezing and after the interruption of the quick freezing.

(3) A large amount of dew condensation around the partition plate can be uniformly prevented even after interruption of quick freezing.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a refrigerator showing an embodiment of the present invention,
2 is a vertical sectional view of the refrigerator, FIG. 3 is a vertical sectional view of a refrigerator showing a conventional example, FIG. 4 is a control circuit diagram of the refrigerator, and FIG.
The figure is a temperature characteristic diagram at the outside air temperature of 30 ° C. 10 ... Freezer room, 11 ... Refrigerator room, 14 ... Compressor, 17 ... Temperature control device, 25 ... Quick freezing device, 26 ... Outside air temperature detection device.

Claims (1)

[Claims] 1. A freezer compartment, a refrigerating compartment, a temperature controller for detecting the temperature in the freezer compartment and controlling the operation of a compressor in a refrigerating cycle, and a quick freezer for forcibly operating the compressor for a certain period of time. Immediately after the completion of quick freezing, the compressor is stopped and operated at a predetermined cycle within a certain period of time according to the outside air temperature. Stop the compressor at a predetermined cycle,
A refrigerator equipped with means for controlling the operation.