JPH11257822A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a refrigerator provided with evaporators in its freezing compartment and cold-storage compartment and having a quick freezing function to freeze foods in a short time by lowering the evaporating temperature of the evaporator of the freezing compartment for a long time and, at the same time, to prevent the temperature in the freezing compartment from rising. SOLUTION: A refrigerating cycle is constituted of a compressor 6, a condenser 7, a first pressure reducing device 18, an evaporator 5 for cold-storage compartment, a second pressure reducing device 19 the pressure reducing amount of which can be adjusted, and an evaporator 4 for freezing compartment in this order in a closed loop in a refrigerator and, when a quick freezing device 21 is driven, the refrigerator controls the pressure reducing amount of the second pressure reducing device 19 to a large value. Consequently, the refrigerator can freeze foods in a short time at the time of quickly freezing the foods by preventing the temperature in the freezing compartment 3 from rising and suppressing the evaporating temperature of the evaporator 4 for freezing compartment for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator having a quick freezing function.

[0002]

2. Description of the Related Art In recent years, in the food environment, in addition to enrichment of frozen processed foods, frozen foods have become widespread. In addition, since the constituents of one household often cannot use up the ingredients in one cooking and store them in a frozen state, there is a demand for a quick freezing function with less deterioration of taste during re-thawing cooking.

A conventional refrigerator having a quick freezing function is disclosed in Japanese Utility Model Laid-Open No. 55-112182.

Hereinafter, the conventional refrigerator will be described with reference to the drawings. FIG. 9 is a block diagram of a conventional refrigerator, and FIG.
0 is the same refrigerant circuit diagram. 9 and 10, 1 is a refrigerator main body, 2 is a freezer compartment, 3 is a refrigerator compartment, 4 is a freezer compartment evaporator, 5 is a refrigerator compartment evaporator, 6 is a compressor, 7 is a condenser, 8,
Reference numerals 9 and 10 decompress devices made of capillaries and the like, 11 an electromagnetic valve for switching a refrigerant flow path, 12 a first refrigerant supply path, 13 a second refrigerant supply path, 14 a quick freeze control circuit, and 15 a sudden freezing control circuit. It is a switch for freezing. The decompression device 9 is set to have a lower decompression amount than the decompression device 10.

[0005] Regarding the refrigerator configured as described above,
The operation will be described below. First, in a normal case, the solenoid valve 11 for switching the refrigerant flow path is in an open state, and the refrigerant flows through the first refrigerant supply path 12 having a low resistance. 6, the condenser 7, the pressure reducing device 8, the solenoid valve 11, the pressure reducing device 9, the refrigerating room evaporator 5, and the freezing room evaporator 4 flow in this order, and return to the compressor 6 again. On the other hand, when the quick-freezing switch 15 is pressed, the quick-freezing control circuit 14 is driven and the solenoid valve 11 for switching the refrigerant flow path is closed, so that the refrigerant flows through the first refrigerant supply path 12. Since it cannot flow, it flows through the second refrigerant supply path 13. At this time, the evaporating temperature of the freezing room evaporator 4 is lower than usual because the decompression device 10 has a larger decompression amount than the decompression device 9.

[0006]

However, in the above-mentioned conventional configuration, the evaporating temperature of the freezing room evaporator 4 becomes low during the quick freezing control, and the freezing time of the food can be shortened. Since the temperature of the refrigerator compartment 3 rises because of the disappearance of the freezing, the quick freezing control must be completed in a short time, and when a large amount of food is frozen, the quick freezing control ends in the middle of freezing. There were drawbacks.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, in which the freezing room evaporator is cooled for a long time to freeze a large amount of food in a short time, and at the same time, the freezing room temperature is raised. It is an object of the present invention to provide a refrigerator that does not end up in the refrigerator.

[0008]

According to the present invention, there is provided a refrigerator, a freezer, a refrigerator, a compressor, a condenser, a first decompression device, and a variable decompression amount. A second decompression device, a decompression amount control means for controlling a decompression amount of the second decompression device, a freezing room evaporator in the freezing room, a refrigerating room evaporator in the refrigerating room, and a freezing room evaporator. A refrigerating compartment blower forcibly ventilating the refrigerator, a refrigerating compartment blower forcibly ventilating the refrigerating compartment, and a quick-freezing device for continuously operating the compressor for a certain period of time, wherein the compressor, the condenser, and the first Decompression device, refrigerator evaporator, second decompression device,
The refrigeration cycle is configured so as to be connected in series in the order of the freezer evaporator to form a closed loop, and when the quick freezing device is driven, the pressure reduction amount control means causes the pressure reduction amount of the second pressure reduction device to increase. It is to be controlled.

In this manner, the refrigerant is also supplied to the refrigerator compartment evaporator during the rapid freezing control in which the evaporation temperature of the freezer compartment evaporator is lowered for a long time and a large amount of food is frozen in a short time. It is possible to prevent the temperature of the refrigerating compartment from rising during quick freezing.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be embodied by the configurations described in the claims. That is, the invention according to claim 1 includes a refrigerator main body, a freezing compartment, a refrigerator compartment, a compressor, a condenser, a first decompression device, a second decompression device capable of varying a decompression amount, A decompression amount control means for controlling a decompression amount of the second decompression device, a freezing room evaporator in the freezing room, a refrigerating room evaporator in the refrigerating room, and a freezing room blower forcibly ventilating the freezing room evaporator. A refrigerating compartment blower for forcibly ventilating the refrigerating compartment, and a quick freezing device for continuously operating the compressor for a certain period of time, wherein the compressor, condenser, first decompression device, refrigerating compartment evaporator, A refrigeration cycle is configured so as to form a closed loop by connecting the decompression device and the freezer evaporator in series in this order, and when the quick freezing device is driven, the decompression amount control means reduces the decompression amount of the second decompression device. It is characterized by controlling it to be large

[0011] When the quick freezing device is driven, the evaporating temperature of the freezing compartment evaporator becomes lower because the decompression amount is larger than usual. Therefore, the temperature of the cold air supplied into the freezer compartment is lowered, and as a result, the freezing speed of the food is increased. On the other hand, since the refrigerant flows through the refrigerator compartment evaporator, the temperature of the refrigerator compartment does not rise. Therefore, the quick-freezing device can be driven for a long time, and even if a large amount of food is frozen, it is not necessary to stop the quick-freezing device on the way.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, there is provided a freezer evaporator temperature detecting means capable of detecting the temperature of the freezer evaporator. It is.

[0013] By maintaining the temperature of the freezer evaporator at the set temperature, the amount of decompression in the second decompression device can be maintained at a predetermined set amount.
It is possible to control the amount of decompression of the decompression device, thereby keeping the temperature of cold air supplied to the freezing room during the quick freezing control at a constant temperature, and supplying excessively low cold air to the freezing room. With the rapid freezing function, which can prevent the problem that the frozen food cannot be effectively frozen rapidly due to the high supply air temperature, which increases the heat loss to the surroundings, and the low cost and easy manufacturing Refrigerator can be provided.

According to a third aspect of the present invention, in addition to the configuration of the first aspect of the present invention, a refrigerating compartment blower control means for controlling the amount of air blown by the refrigerating compartment blower, and controlling the speed of the compressor. It is provided with a compressor control means and a freezing room blower control means for controlling the amount of air blown by the freezing room blower.

When the quick-freezing device is driven, the amount of air blown from the refrigerator compartment is controlled to decrease, and at the same time, the speed of the compressor is increased so that the amount of air blown from the freezer increases. In this way, the heat exchange capacity of the refrigerator compartment evaporator is suppressed, the input of the refrigerator compartment blower is reduced, and the heat conductivity inside the refrigerator is reduced by reducing the circulation wind speed of the refrigerator compartment. As a result, the cooling load of the refrigerator compartment is reduced. Furthermore, by reducing the evaporating temperature of the freezer evaporator during the quick freezing control, the specific volume of the suction gas of the compressor is increased, and as a result, the circulation amount of the refrigerant flowing through the refrigeration cycle is reduced. And circulates a certain amount or more of refrigerant without excess or shortage. In addition, the heat exchange capacity of the freezer evaporator during the rapid freezing control is improved, and the refrigerant can be reliably evaporated, and the heat transfer coefficient on the food surface is improved by increasing the wind speed on the food surface, This is to shorten the freezing time. Therefore, an efficient and powerful quick freezing function can be realized.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, a timer device for measuring an elapsed time from the start of driving of the quick freezing device is provided. The control is performed such that the pressure reduction amount of the second pressure reduction device is gradually increased every time a predetermined time elapses from the driving.

In a state where the temperature of the food is still high immediately after the input of the food, the pressure reduction amount of the second pressure reducing device is not increased so much that the temperature of the food itself gradually decreases as time passes. The temperature difference between the food and the evaporator of the freezer compartment can be kept within a certain range by increasing the pressure reduction amount of the second decompression device to lower the evaporating temperature of the freezer compartment. , And wasteful power consumption is suppressed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a refrigerator according to the present invention will be described below with reference to the drawings. 9 and 10
The same reference numerals are given to portions having the same configuration and the same function as those of the related art, and detailed description thereof is omitted.

(Embodiment 1) FIG. 1 is a block diagram of a refrigerator in Embodiment 1 of the present invention, and FIG. 2 is a refrigerant circuit diagram of the refrigerator in the embodiment.

1 and 2, reference numeral 1 denotes a refrigerator body,
2 is a freezer compartment, 3 is a refrigerator compartment, 4 is a freezer compartment evaporator in the freezer compartment 2, 5 is a refrigerator compartment evaporator in the refrigerator compartment 3,
Reference numeral 16 denotes a freezing room blower forcibly ventilating the freezing room evaporator 4, 17 denotes a refrigerating room blower forcibly ventilating the refrigerating room evaporator 5, 6 denotes a compressor, 7 denotes a condenser, and 18 denotes a capillary tube or the like. A first decompression device comprising: a second decompression device 19, which can arbitrarily change a decompression amount by driving a needle by a stepping motor; and 20, a decompression amount for controlling the decompression amount of the second decompression device 19. Control means 21 is a quick freezing device for continuously operating the compressor 6 for a predetermined time, and 15 is a quick freezing switch. The refrigerant flow path is connected in series with the compressor 6, the condenser 7, the first decompression device 18, the refrigerating room evaporator 5, the second decompression device 19, and the freezing room evaporator 4 to form a closed loop. The refrigeration cycle is configured as follows. Reference numeral 22 denotes a freezing compartment temperature detecting means for detecting the temperature of the freezing compartment 2, reference numeral 23 denotes a refrigerator compartment temperature detecting means for detecting the temperature of the refrigerating compartment 3, and reference numeral 24 denotes the freezing room blower 16.
Is a refrigerator drive unit for controlling the operation of the refrigerator, 25 is a refrigerator drive unit for controlling the operation of the refrigerator 17, 26 is a compressor drive unit for controlling the operation of the compressor 6, 27 is a microcomputer The signals from the quick-freezing device 21, the freezing room temperature detecting means 22, and the refrigerator compartment temperature detecting means 23 are inputted, and the freezing room blower driving device 24, the refrigerator room blowing device driving device 25, and the compressor driving device 26 are inputted. The operation signal is output to.

Regarding the refrigerator configured as described above,
The operation will be described below. Normally, the temperature inside the freezer 2 is detected by the freezer
Output to When the temperature of the freezing room 2 input to the microcomputer 27 is higher than a preset temperature, the microcomputer 27 controls the freezing room blower driving device 24 and the compressor driving device 2
6 to output a drive signal. Next, the freezing room blower driving device 24 to which the driving signal has been input drives the freezing room blower 16. Further, the compressor drive device 26 to which the drive signal is input drives the compressor 6. Then, the freezer 2
Is cooled and the temperature in the freezing room 2 detected by the freezing room temperature detecting means 22 becomes lower than the set value, the microcomputer 27 outputs a signal to the freezing room blower driving device 24 and the compressor driving device 26. Then, the freezing room blower 16 and the compressor 6 are stopped. On the other hand, the refrigerator compartment temperature detecting means 23 detects the temperature inside the refrigerator compartment 3 and outputs it to the microcomputer 27. At this time, the temperature of the refrigerator compartment 3 is compared with a set value. If the temperature is high, the refrigerator compartment fan 17 is operated via the refrigerator compartment fan drive device 25, and if the temperature is low, the refrigerator compartment fan 17 is stopped. .

Next, control during rapid freezing will be described. When the quick-freezing switch 15 is pressed, the signal is input to the quick-freezing device 21. Next, the quick-freezing device 21 outputs a signal to the freezing room blower driving device 24 and the compressor driving device 26 via the microcomputer 27 to drive the compressor 6 and the freezing room blower 16. At the same time, the quick freezing device 21
The built-in timer circuit starts counting the accumulated time. Next, the quick freezing device 21 outputs a signal to the pressure reduction amount control means 20. The decompression amount control means 20 which has received the signal drives the stepping motor of the second
The pressure reduction amount in the pressure reduction device 19 is increased. As a result, during the rapid freezing control, the pressure of the refrigerant flowing into the freezing room evaporator 4 decreases, that is, the evaporation temperature of the refrigerant in the freezing room evaporator 4 decreases. Along with this, the temperature of the cold air that cools the freezing compartment 2 becomes low, and as a result, the food can be frozen in a short time, and even if the frozen food is re-thawed and cooked, deterioration of the taste due to freezing is minimized. Can be suppressed. Further, since the inside of the freezing compartment 2 can be cooled by forced ventilation, even if a large amount of food is put into the freezing compartment 2, it can be cooled to every corner. At the same time, since the refrigerant is also flowing into the refrigerator compartment evaporator 5 during the quick freezing control, even if the temperature in the refrigerator compartment 3 rises due to the taking in and out of food in the refrigerator compartment 3, the refrigerator compartment blower 17 is operated. By driving, the temperature of the refrigerator compartment 3 can be quickly cooled to a predetermined temperature, and the freshness of the food in the refrigerator compartment 3 is maintained even during the quick freezing control,
It can be saved.

As described above, the refrigerator according to the present embodiment is a specific configuration example of the first aspect of the present invention, and includes a refrigerator main body 1, a freezing room 2, a refrigerating room 3, and a compressor 6. , Condenser 7
A first decompression device 18, a second decompression device 19 capable of varying the decompression amount, a decompression amount control means 20 for controlling the decompression amount of the second decompression device 19, and a refrigeration in the freezing chamber 2. A room evaporator 4, a refrigerator room evaporator 5 in the refrigerator room 3, a freezing room blower 16 forcing the freezing room evaporator 4 to ventilate,
A refrigerating compartment blower 17 for forcibly ventilating the refrigerating compartment 3; and a quick freezing device 21 for continuously operating the compressor 6 for a certain period of time. The compressor 6, the condenser 7, the first decompression device 18, The refrigerating room evaporator 4, the second decompression device 19, and the freezing room evaporator 4 are connected in series in this order to form a closed cycle and form a closed loop. When the quick freezing device 21 is driven, the decompression amount control means 20 Is characterized by controlling the amount of pressure reduction of the second pressure reducing device 19 to be large.
When the quick freezing device 21 is driven, the freezing room evaporator 4 has a larger decompression amount than usual, so that the evaporation temperature becomes lower. Therefore, the temperature of the cold air supplied into the freezer 2 becomes low,
As a result, the freezing speed of the food is increased. On the other hand, since the refrigerant flows through the refrigerator compartment evaporator 5, the temperature of the refrigerator compartment 3 does not rise. Therefore, the long-time quick freezing device 2
1 can be driven, and even if a large amount of food is frozen, it is not necessary to stop the quick freezing device 21 on the way.

(Embodiment 2) FIG. 3 is a block diagram of a refrigerator in Embodiment 2 of the present invention, and FIG. 4 is a flowchart showing the operation of the refrigerator.

In FIG. 3, reference numeral 28 denotes the freezer evaporator 4.
Is a means for detecting the temperature of the freezing room evaporator, and can output the temperature of the freezing room evaporator 4 to the microcomputer 27.

In this embodiment, the refrigerator of the first embodiment is further provided with a freezer evaporator temperature detecting means 28.

With respect to the refrigerator configured as described above,
The operation will be described below with reference to the flowchart of FIG.

First, the normal cooling operation is the same as in the first embodiment. Next, at the time of quick freezing control,
In step 1, it is checked whether the quick freeze switch 15 has been pressed. If it is pressed, the process proceeds to step 2; if it is not pressed, step 1 is repeated. Next, in step 2, a signal for starting quick freezing control is output to the quick freezing device 21. Next, in step 3, the quick freezing device 21 outputs a signal to the freezing room blower driving device 24 to drive the freezing room blower 16. In step 4, the quick freezing device 21 outputs a signal to the compressor driving device 26 to drive the compressor 6. Next, in step 5, the quick freezing device 21 starts counting the accumulated time of the built-in timer circuit. Next, in step 6, the quick freezing device 21 outputs a signal to the reduced pressure control means 20. The decompression amount control means 20 that has received the signal drives the stepping motor of the second decompression device 19 to increase the decompression amount in the second decompression device 19. Next, in step 7, the freezing room evaporator temperature detecting means 28 outputs the temperature of the freezing room evaporator 4 to the microcomputer 27. At step 8, the microcomputer 27 compares the temperature of the freezer compartment evaporator 4 with a preset temperature of the freezer compartment evaporator 4 at the time of rapid freezing. If the temperature is high, the process proceeds to step 9; Proceed to. In step 9, the microcomputer 27 outputs a signal to the pressure reduction amount control means 20 to drive the stepping motor of the second pressure reduction device 19 to reduce the pressure reduction amount in the second pressure reduction device 19. As a result, the pressure of the refrigerant in the freezer compartment evaporator 4 decreases, and the temperature of the freezer compartment evaporator 4 decreases. Thereafter, the process proceeds to step 11. In step 10, the microcomputer 27 outputs a signal to the pressure reduction amount control means 20 to drive the stepping motor of the second pressure reduction device 19 to increase the pressure reduction amount in the second pressure reduction device 19. As a result, the pressure of the refrigerant in the freezer evaporator 4 increases, and the temperature of the freezer evaporator 4 increases. afterwards,
Proceed to step 11. In step 11, the count of the accumulated time of the timer circuit of the quick freezing device 21 is checked. If the set time has not been reached, the process returns to step 8, and if the set time has been reached, the process proceeds to step 12. In step 12, the quick freezing device 21 is operated by the freezing room blower driving device 24 and the compressor driving device 26.
To the compressor 6 and the freezer blower 16
To stop. Next, in step 13, the microcomputer 27 outputs a signal to the decompression amount control means 20 and the second decompression device 1
9 is driven to drive the second pressure reducing device 19
Is returned to the normal setting of the pressure reduction amount. Then, the quick freezing control is terminated.

As described above, since the refrigerator in the first embodiment is further provided with the freezer compartment evaporator temperature detecting means 28, the temperature of the freezer compartment evaporator 4 is maintained at the set temperature, so that the second condition is maintained. By keeping the decompression amount in the decompression device 19 constant, it is possible to control the decompression amount of the second decompression device 19 by a simple method of temperature measurement, and thereby the freezing room during the quick freezing control In this case, the temperature of the cool air supplied to the cooling room 2 is maintained at a constant temperature, so that excessively low cool air is supplied to increase only the heat loss from the freezing compartment 2 to the surroundings. It is possible to provide a refrigerator with a quick freezing function that can prevent food from being rapidly frozen and that is low-cost and easy to manufacture.

(Embodiment 3) FIG. 5 is a block diagram of a refrigerator according to a third embodiment of the present invention, and FIG. 6 is a flowchart showing the operation of the refrigerator.

In FIG. 5, reference numeral 29 denotes a freezer compartment blower control means for controlling the amount of air blown by the freezer blower 16, 30 denotes a refrigerator compartment blower control means for controlling the amount of air blown by the refrigerator compartment blower 17,
Reference numeral 31 denotes compressor control means for controlling the speed of the compressor 6, and the freezer compartment blower control means 29, the refrigerator compartment blower control means 30, and the compressor control means 31 are capable of inputting the man-con 27.

In the present embodiment, the refrigerator in the first embodiment is further provided with a freezer compartment blower control means 29, a refrigerator compartment blower control means 30, and a compressor control means 31.

With respect to the refrigerator configured as described above,
The operation will be described below with reference to the flowchart of FIG.

First, the normal cooling operation is the same as that of the first embodiment. Next, at the time of quick freezing control,
In step 1, it is checked whether the quick freeze switch 15 has been pressed. If it is pressed, the process proceeds to step 2; if it is not pressed, step 1 is repeated. next,
In step 2, a signal for starting quick freezing control is output to the quick freezing device 21. Next, in step 3, the quick freezing device 21 outputs a signal to the freezing room blower driving device 24 to drive the freezing room blower 16. At this time, the microcomputer 27 outputs a signal to the freezing room blower control means 29, and sets the freezing room blower 16 to operate at a higher speed than during normal cooling. Next, in step 4, the quick freezing device 21 outputs a signal to the compressor driving device 26 to drive the compressor 6. Also in this case, the microcomputer 27 outputs a signal to the compressor control means 31 to set the compressor 6 to operate at a higher speed than during normal cooling. Next, in step 5, the microcomputer 27 outputs a signal to the refrigerator compartment blower control means 30 to set the refrigerator compartment blower 17 to operate at a lower speed than during normal cooling. Accordingly, when the temperature inside the refrigerator compartment 3 detected by the refrigerator compartment temperature detecting means 23 is higher than the set value, the refrigerator compartment blower 17 operates at a lower speed than during normal cooling. Next, in step 6, the quick freezing device 21 starts counting the accumulated time of the built-in timer circuit.
Next, in step 7, the quick freezing device 21
Output the signal. Reduced pressure control means 20 receiving the signal
Drives the stepping motor of the second decompression device 19 to increase the amount of decompression in the second decompression device 19. In step 8, the count of the accumulated time of the timer circuit of the quick freezing device 21 is checked. If the set time has not been reached, step 8 is repeated, and if the set time has been reached, the process proceeds to step 9. In step 9, the quick freezing device 21 outputs a signal to the freezing room blower driving device 24 and the compressor driving device 26 to stop the compressor 6 and the freezing room blower 16. Next, at step 10, the microcomputer 27 outputs a signal to the pressure reduction amount control means 20 to drive the stepping motor of the second pressure reduction device 19 to return the pressure reduction amount of the second pressure reduction device 19 to the normal setting. In the next step 11, the microcomputer 27
Are the freezer compartment blower control means 29 and the refrigerator compartment blower control means 3
0, output to the compressor control means 31 and
6, The rotation speed setting of the refrigerator 17 and the compressor 6 is returned to the setting of the normal cooling state. Then, the quick freezing control is terminated.

As described above, the refrigerator according to the first embodiment is provided with the freezer compartment blower control means 29, the refrigerator compartment blower control means 30, and the compressor control means 31, so that when the quick freezing device 21 is driven, Control is performed such that the amount of air blown from the refrigerator compartment fan 17 is reduced, and simultaneously, the speed of the compressor 6 is controlled to increase, and further, the amount of air blown from the freezer room blower 16 is controlled to increase. By doing so, the wind speed passing through the freezing compartment evaporator 4 is increased, the heat exchange capacity is improved, and the freezing capacity of the freezing compartment 2 can be increased. At the same time, by increasing the circulating wind speed in the freezer 2, the wind speed on the food surface can be increased, thereby improving the heat transfer coefficient on the food surface and shortening the freezing time. Further, by reducing the circulating wind speed in the refrigerator compartment 3, the thermal conductivity inside the refrigerator can be reduced, and the cooling load of the refrigerator compartment 3 can be reduced. Furthermore, the specific volume of the suction gas of the compressor 6 is increased by increasing the pressure reduction amount of the second pressure reducing device 19 and reducing the evaporation temperature of the freezing room evaporator 4 during the rapid freezing control, thereby flowing through the refrigeration cycle. Although the amount of circulation of the refrigerant is reduced, it is possible to circulate a certain amount or more of the refrigerant by increasing the operating rotation speed of the compressor 6, and evaporate the refrigerant in the freezer evaporator 4 without excess or shortage. It is something that can be done. Therefore, an efficient and powerful quick freezing function can be realized.

(Embodiment 4) FIG. 7 is a block diagram of a refrigerator according to a fourth embodiment of the present invention, and FIG. 8 is a temperature / pressure characteristic diagram of the refrigerator.

In FIG. 7, reference numeral 32 denotes a timer device for measuring an elapsed time from the start of driving of the quick-freezing device 21, and the timer device 32 can output an integrated time to the microcomputer 27. 8, T1 is the temperature of the freezer evaporator 4, T2 is the temperature of the food put into the freezer 2, P1
Is the pressure of the refrigerant in the freezer evaporator 4, t0, t1, t
2 indicates the elapsed time from the start of the quick freeze control.

In this embodiment, a timer device 32 is further provided in the refrigerator of the first embodiment.

With respect to the refrigerator configured as described above,
The operation will be described below. First, the normal cooling operation is the same as in the first embodiment. Next, regarding the control at the time of quick freezing, for example, when a food at 30 ° C. to be cooled is put into the freezing room 2 and the quick freezing switch 15 is pressed, the signal is input to the quick freezing device 21. . Next, the quick-freezing device 21 outputs a signal to the freezer-room blower driving device 24 and the compressor driving device 26 to drive the compressor 6 and the freezing-room blower 16. At the same time, the timer device 32 built in the quick freezing device 21 starts counting the accumulated time. Next, the quick freezing device 21 outputs a signal to the pressure reduction amount control means 20. The decompression amount control means 20 that has received the signal drives the stepping motor of the second decompression device 19 to increase the decompression amount in the second decompression device 19. Thereby, the pressure of the refrigerant flowing into the freezer evaporator 4 is reduced during the rapid freezing control. For example, the pressure is normally 0.077 MPa, but is 0.067 MPa at the start of the quick freezing control. Thereby, the evaporation temperature of the refrigerant in the freezer evaporator 4 decreases from -32 ° C to -35 ° C. Next, when the food is gradually frozen and the timer reaches the freezing temperature of -1 ° C. and the count of the timer device 32 elapses t1 (30 minutes), the quick-freezing device 21 again controls the pressure reduction amount. A signal is output to the means 20. The pressure reduction amount control means 20 that has received the signal drives the stepping motor of the second pressure reduction device 19 to further increase the pressure reduction amount in the second pressure reduction device 19, and reduces the pressure of the refrigerant flowing into the freezer evaporator 4. Reduce to 0.052 MPa. As a result, the evaporation temperature of the refrigerant in the freezer evaporator 4 decreases from −35 ° C. to −40 ° C. Next, when the count of the timer device 32 elapses t2 (120 minutes) from the start of the quick freezing, the quick freezing device 21 outputs a signal to the freezing room blower driving device 24 and the compressor driving device 26, and 6 and the freezer blower 16 are stopped. At the same time, quick freeze device 2
1 outputs a signal to the pressure reduction amount control means 20. The pressure reduction amount control means 20 that has received the signal drives the stepping motor of the second pressure reduction device 19 to return the pressure reduction amount of the second pressure reduction device 19 to the setting for normal cooling. Then, the quick freezing control ends.

As described above, since the refrigerator of the present embodiment is provided with the timer device 32 in the refrigerator of the first embodiment, the second decompression device 19 is gradually released from the quick-freezing device 21 every predetermined time. Can be controlled so as to increase the depressurized amount of the food, and when the temperature of the food is still high immediately after the input of the food, there is a sufficient temperature difference between the freezing compartment 2 and the input food (rapid freezing to t1). Then too much freezer evaporator 4
The compressor 6 is operated at a low compression ratio without reducing the evaporating temperature of the refrigerant at the time of reducing the power consumption.
Then, after a lapse of time, the food temperature is the freezing temperature-
When the temperature reaches 1 ° C. and the temperature difference between the freezing compartment 2 and the food becomes small, the pressure reduction amount of the second decompression device 19 is increased again to lower the evaporation temperature of the refrigerant in the freezing compartment evaporator 4. ,
Food can be frozen at a stretch with cold air. Therefore, the temperature difference between the food and the freezer evaporator 4 can be maintained within a certain range, and the effect of suppressing unnecessary power consumption without impairing the freezing time can be obtained.

[0041]

As described above, according to the first aspect of the present invention, the refrigerator body, the freezing room, the refrigerating room, the compressor, the condenser, the first pressure reducing device, and the pressure reducing amount are provided. A second decompression device, a decompression amount control means for controlling a decompression amount of the second decompression device, a freezing room evaporator in the freezing room, a refrigerating room evaporator in the refrigerating room, A refrigerating room blower forcibly ventilating the room evaporator, a refrigerating room blower forcibly ventilating the refrigerating room, and a quick-freezing device for continuously operating the compressor for a certain period of time; 1, a decompression device, a refrigerator evaporator, a second decompression device,
A refrigeration cycle is configured to form a closed loop connected in series with the freezer evaporator, and when the quick freezing device is driven,
The pressure reducing amount control means controls the pressure reducing amount of the second pressure reducing device to be large.

When the quick-freezing device is driven, the evaporating temperature of the freezing compartment evaporator becomes lower because the decompression amount is larger than usual. Therefore, the temperature of the cold air supplied into the freezer compartment is lowered, and as a result, the freezing speed of the food is increased. On the other hand, since the refrigerant flows through the refrigerator compartment evaporator, the temperature of the refrigerator compartment does not rise. Therefore, the quick-freezing device can be driven for a long time, and even if a large amount of food is frozen, it is not necessary to stop the quick-freezing device on the way.

According to the second aspect of the present invention, there is provided a freezer evaporator temperature detecting means capable of detecting the temperature of the freezer evaporator.

Then, by maintaining the temperature of the freezer evaporator at the set temperature to keep the pressure reduction amount in the second pressure reduction device constant, the second method can be performed by a simple method called temperature measurement.
It is possible to control the amount of decompression of the decompression device, thereby keeping the temperature of cold air supplied to the freezing room during the quick freezing control at a constant temperature, and supplying excessively low cold air to the freezing room. With the rapid freezing function, which can prevent the problem that the frozen food cannot be effectively frozen rapidly due to the high supply air temperature, which increases the heat loss to the surroundings, and the low cost and easy manufacturing Refrigerator can be provided.

According to the third aspect of the present invention, a refrigerating compartment blower control means for controlling an amount of air blown by a refrigerating compartment blower;
The compressor is provided with compressor control means for controlling the speed of the compressor, and freezer compartment blower control means for controlling the amount of air blown by the freezer blower.

When the quick-freezing device is driven, control is performed such that the amount of air blown from the refrigerator compartment is reduced, and simultaneously, the speed of the compressor is increased so that the amount of air blown by the freezer compartment blower is increased. Control the heat exchange capacity of the refrigerator compartment evaporator and reduce the input of the refrigerator compartment blower, and at the same time, reduce the heat conductivity inside the refrigerator by reducing the circulating wind speed of the refrigerator compartment. It is possible to reduce the cooling load of the refrigerator compartment. Furthermore, by reducing the evaporating temperature of the freezer evaporator during the quick freezing control, the specific volume of the suction gas of the compressor is increased, and as a result, the circulation amount of the refrigerant flowing through the refrigeration cycle is reduced. In this way, a certain amount or more of the refrigerant can be circulated without excess or shortage, and the heat exchange capacity of the freezer evaporator during the quick freezing control can be improved, and the refrigerant can be reliably evaporated. In addition, by increasing the wind speed on the food surface, the heat transfer coefficient on the food surface is improved, and the freezing time is shortened. Therefore, an efficient and powerful quick freezing function can be realized.

According to the fourth aspect of the present invention, there is provided a timer device for measuring an elapsed time from the start of driving of the quick-freezing device, and the second device is gradually provided every time a predetermined time elapses from the driving of the quick-freezing device. The control is performed so as to increase the pressure reduction amount of the pressure reduction device.

In the state where the temperature of the food is still high immediately after the input of the food, the amount of reduced pressure of the second pressure reducing device is not increased so much that the temperature of the food itself gradually decreases as time passes. The temperature difference between the food and the evaporator of the freezer compartment can be kept within a certain range by increasing the pressure reduction amount of the second decompression device to lower the evaporating temperature of the freezer compartment. , And wasteful power consumption is suppressed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a refrigerator according to a first embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram of the refrigerator.

FIG. 3 is a block diagram of a refrigerator according to a second embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the refrigerator.

FIG. 5 is a block diagram of a refrigerator according to a third embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the refrigerator.

FIG. 7 is a block diagram of a refrigerator according to a fourth embodiment of the present invention.

FIG. 8 is a temperature / pressure characteristic diagram of the refrigerator.

FIG. 9 is a block diagram of a conventional refrigerator.

FIG. 10 is a refrigerant circuit diagram of the refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator main body 2 Freezer room 3 Refrigerator room 4 Refrigerator room evaporator 5 Refrigerator room evaporator 6 Compressor 7 Condenser 15 Quick freezing switch 16 Freezer room blower 17 Refrigerator room blower 18 First decompression device 19 Second decompression device REFERENCE SIGNS LIST 20 Decompression amount control means 21 Quick freezing device 22 Freezing room temperature detecting means 23 Refrigerator room temperature detecting means 24 Freezing room blower driving device 25 Refrigerator room blowing device driving device 26 Compressor driving device 27 Microcomputer 28 Freezing room evaporator temperature detecting device 29 Freezing Room blower control means 30 Refrigerator room blower control means 31 Compressor control means 32 Timer device

Claims (4)

[Claims] 1. A refrigerator body, a freezer compartment, a refrigerator compartment, a compressor, a condenser, a first decompression device, a second decompression device capable of changing a decompression amount, and the second decompression device. A decompression amount control means for controlling the decompression amount, a freezing room evaporator in the freezing room, a refrigerating room evaporator in the refrigerating room, a freezing room blower forcibly ventilating the freezing room evaporator, and A refrigerating compartment blower for forced ventilation, and a quick freezing device for continuously operating the compressor for a certain period of time, wherein the compressor, condenser, first decompression device, refrigerating compartment evaporator, second decompression device,
A refrigeration cycle is configured to form a closed loop connected in series with the freezer evaporator, and when the quick freezing device is driven,
The refrigerator according to claim 1, wherein the pressure reduction amount control means controls the pressure reduction amount of the second pressure reduction device to increase. 2. A freezing-room evaporator temperature detecting means capable of detecting the temperature of the freezing-room evaporator, and maintaining the temperature of the freezing-room evaporator at a set temperature to reduce the pressure in the second decompression device. 2. The refrigerator according to claim 1, wherein the amount is kept at a predetermined set amount. 3. A refrigerating compartment blower control means for controlling an amount of air blown by a refrigerating compartment blower, a compressor control means for controlling a speed of a compressor, and a freezing room blower control means for controlling a blowing amount of a freezing room blower. When the quick-freezing device is driven, control is performed such that the air volume of the refrigerator compartment air blower is reduced, and simultaneously, the speed of the compressor is increased so that the air volume of the freezer air blower is increased. 2. The refrigerator according to claim 1, wherein the temperature is controlled to a predetermined value. 4. A timer device for measuring an elapsed time from the start of driving of the quick-freezing device, wherein the pressure-reducing amount of the second pressure-reducing device is gradually increased every elapse of a predetermined time from the driving of the quick-freezing device. 2. The refrigerator according to claim 1, wherein the temperature is controlled to a predetermined value.