JP2001280786A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that freshness of articles stored in a refrigerating compartment deteriorates when a large quantity of articles are placed simultaneously in the refrigerating compartment and a freezing compartment and inner temperature of both compartments rise, and a problem that energy consumption increases because each compartment is cooled individually. SOLUTION: At the time of freeze cycle operation, refrigerant flows simultaneously through an evaporator 7 for refrigerating compartment and an evaporator 4 for freezing compartment or flows only through the evaporator 4 for freezing compartment.

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 refrigerating cycle having a plurality of evaporators.

[0002]

2. Description of the Related Art Conventionally, this kind of refrigerator is disclosed in
As disclosed in Japanese Patent Publication No. 0-47827, the refrigerator has a refrigerator compartment and a freezer compartment, and each of the compartments is provided with a refrigerator compartment temperature sensing device and a freezer compartment temperature sensing device for sensing room temperature, and a compressor;
A plurality of evaporators connected in parallel to the compressor, a throttle device provided corresponding to each of the evaporators, a condenser, and a refrigerant flow path, comprising a refrigeration cycle, The evaporator has a refrigerator compartment evaporator and a freezer compartment evaporator, and has a refrigerator compartment fan and a freezer compartment fan for cooling each of the evaporators, and cools at least a part of the condenser. A condenser fan to be provided, an open / close valve is provided between the expansion device and the condenser connected to the refrigerator compartment evaporator of the refrigeration cycle, and the refrigerator compartment fan and the freezer compartment fan are operated alternately, In some cases, the on-off valve is opened and closed in synchronization with the operation of the refrigerator compartment fan, and the refrigerating capacity is reduced during the cooling operation of the refrigerating compartment as compared with the cooling operation of the freezing compartment.

[0003]

In the above-described refrigerator, when the temperature of the refrigerator compartment and the temperature of the freezer compartment simultaneously become equal to or higher than the set temperature, for example, a large amount of newly stored articles are simultaneously placed in the refrigerator compartment and the freezer compartment. When the room temperature rises, the problem is that the freshness of the storage room stored in a non-priority storage room, for example, a refrigerator is reduced, and the energy consumption increases because each room is individually cooled. There was a problem that.

[0004]

SUMMARY OF THE INVENTION The refrigerator of the present invention has solved the above-mentioned problems, and the refrigerator of the present invention has at least a refrigerator room and a freezer room. A refrigerator temperature sensor and a freezer temperature sensor are provided, and a compressor whose capacity is variable, a plurality of evaporators connected in parallel in the refrigeration cycle, and a plurality of evaporators are provided corresponding to the respective evaporators. A refrigeration cycle comprising a throttle device, a condenser, and a refrigerant flow path, there are a refrigerator compartment evaporator and a freezer compartment evaporator corresponding to the refrigerator compartment and the freezer compartment, respectively, An on-off valve is provided between the expansion device and the condenser connected to the refrigerator compartment evaporator of the refrigeration cycle, and during the refrigeration cycle operation, does the refrigerant flow into the refrigerator compartment evaporator and the refrigerator compartment evaporator simultaneously? Whether the refrigerant flows only to the freezer evaporator. It is characterized in that at or misalignment.

The refrigerator of the present invention has at least a refrigerator compartment and a freezer compartment, and each of the compartments is provided with a refrigerator compartment temperature sensing device for sensing room temperature and a freezer compartment temperature sensing device, and the capacity is variable. A compressor, a plurality of evaporators connected in parallel in the refrigeration cycle, a throttling device provided corresponding to each of the evaporators, a condenser, and a refrigerant flow path include a refrigeration cycle. A refrigerating room evaporator and a freezing room evaporator corresponding to the refrigerating room and the freezing room, respectively, having a variable-speed fan for cooling each of the evaporators; An opening and closing valve is provided between the expansion device connected to the refrigerator compartment evaporator and the condenser, and the refrigerant flows simultaneously into the refrigerator compartment evaporator and the refrigerator compartment evaporator during the refrigeration cycle operation, or Does refrigerant flow only to the freezer evaporator? When the refrigerant is flowing through the refrigerator compartment evaporator and the freezer compartment evaporator, the refrigerator compartment fan and the freezer compartment fan are simultaneously operated, and the refrigerant flows only through the freezer compartment evaporator. Is characterized in that only the freezer compartment fan is operated.

[0006] The refrigerator of the present invention is provided with a condenser fan for cooling at least a part of the condenser, and the condenser fan is controlled by changing the rotation speed as required. is there.

Further, the refrigerator of the present invention is characterized in that when the refrigerant flows into the refrigerator compartment evaporator and the freezer compartment evaporator at the same time, and when the refrigerant flows only into the freezer compartment evaporator,
The refrigerating capacity of the compressor and the number of revolutions of the condenser fan are changed and controlled as necessary.

Further, the refrigerator according to the present invention has a condenser fan. When the room temperature of the refrigerator is at or above a predetermined set temperature and the room temperature of the freezer is at or below a predetermined set temperature, the refrigerator is provided. A refrigerant is caused to flow simultaneously into the evaporator for the refrigerator and the evaporator for the freezer compartment, thereby reducing the number of revolutions of the condenser fan and reducing the refrigerating capacity of the compressor.

Further, in the refrigerator according to the present invention, when the room temperature of the refrigerator is equal to or higher than a predetermined temperature and the room temperature of the freezer is equal to or lower than the predetermined temperature, the evaporator for the refrigerator and the freezer are provided. The refrigerant is simultaneously flowed to the evaporator for use and the switching temperature for the freezer compartment by the freezer compartment temperature sensor is set to be higher.

Further, the refrigerator of the present invention is characterized in that the operation of the variable capacity compressor is controlled by both the refrigerator temperature sensor and the freezer temperature sensor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a refrigerator according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a refrigerator according to the present invention. In FIG. 1, reference numeral 1 denotes a compressor, 2 denotes a condenser, 3 denotes a freezing room throttle device connected to a freezing room evaporator 4, and 5 denotes an on-off valve. , 6 is a throttle device for the refrigerator compartment connected to the evaporator 7 for the refrigerator compartment, 8 is a condenser fan for cooling at least a part of the condenser 2, and 9 is cold air cooled by the evaporator 4 for the freezer compartment. Is a freezing room fan for sending out to the freezing room 10, 11 is a cooling room fan for sending out the cold air cooled by the cold room evaporator 7 to the cold room 12, 13 is a freezing room temperature sensing device, and 14 is It is a refrigerator room temperature sensing device.

The throttle device 3 for the freezer compartment and the evaporator 4 for the freezer compartment, the on-off valve 5, the throttle device 6 for the refrigerator compartment and the evaporator 7 for the refrigerator compartment are connected in parallel, and the compressor 1, the condenser 2, the freezing room throttle device 3, the freezing room evaporator 4, the on-off valve 5, the refrigerating room throttle device 6, and the refrigerating room evaporator 7 form a refrigerating cycle.

Then, the freezer compartment 10 and the refrigerator compartment 12 are both set at a set temperature (for example, the set temperature is -18 ° C.
When the temperature of the refrigerating compartment 12 is higher than 5 ° C.), the freezing compartment temperature sensing device 13 and the refrigerating compartment temperature sensing device 14 sense the room temperature, the compressor 1 is operated by the control device (not shown), and the condenser 2 liquefies. The refrigerant thus removed passes through the freezer compartment expansion device 3 and evaporates in the freezer compartment evaporator 4 while removing heat from the surrounding air and flows. The refrigerant liquefied in the condenser 2 is opened and closed by the open / close valve. 5 passes through the refrigerating room expansion device 6 and evaporates in the refrigerating room evaporator 7 while removing heat from the surrounding air, flows back to the compressor 1 in a vaporized state, and forms a series of refrigeration cycles.

At this time, the condenser fan 8, the freezing room fan 9 and the refrigerating room fan 11 are also operated in synchronism, and the condenser fan 8 cools the condenser 2 and assists the liquefaction of the refrigerant. The cooling fan 9 and the refrigerator compartment fan 11 send cold air cooled by the freezer compartment evaporator 4 and the refrigerator compartment evaporator 7 to the freezer compartment 10 and the refrigerator compartment 12, respectively.
2 will be cooled to a predetermined room temperature. for that reason,
Even if a large number of stored items are newly stored in the freezer compartment 10 or the refrigerator compartment 12 at the same time, they are immediately cooled and deterioration of the stored items can be prevented.

The refrigerating room 12 is at a predetermined room temperature (for example,
When the temperature reaches 3 ° C.), the on-off valve 5 is closed, and the refrigerant does not flow into the evaporator 7 for the refrigerator. Then, after a predetermined time has elapsed, the refrigerator compartment fan 11 is stopped.

At this time, if the freezing room 10 has not reached a predetermined temperature (for example, -18 ° C.), the operation of the compressor 1, the condenser fan 8 and the freezing room fan 9 is continued, and the compressor 1 Is reduced to a predetermined value by a control device (not shown), and at the same time, the number of rotations of the condenser fan 8 is also reduced to a speed corresponding to the capacity. Therefore, the compressor 1 and the condenser fan 8 are efficiently operated, which leads to energy saving.

If the operation of the refrigerating room fan 11 is reduced to a predetermined number of revolutions and the operation is continued, the cooling air in the refrigerating room 12 is agitated.
When the refrigerator compartment evaporator 7 is in a frosted state, the cold air in the refrigerator compartment 12 is useful for defrosting the refrigerator compartment evaporator 7, and the defrosting also serves to humidify the refrigerator compartment 12. Useful.

The temperature of the refrigerating room 12 becomes higher than a predetermined room temperature (for example, 5 ° C.).
When the temperature is equal to or lower than a predetermined room temperature (for example, −18 ° C.), the freezing room temperature sensing device 13 or the refrigerator room temperature sensing device 1
4 senses each room temperature, and based on the sensed temperature, the refrigerating room 10 and the refrigerating room 12 are both set at a set temperature (for example, the refrigerating room 12 is controlled by a control device (not shown)) according to the required capacity. The set temperature is higher than −18 ° C. in the freezer compartment 10 and 5 ° C. in the refrigerator compartment 12), and the operation is performed at a lower capacity than when the freezer compartment 10 and the refrigerator compartment 12 are simultaneously cooled. Since the rotation speed of the motor 9 is also lowered by the control device (not shown) in accordance with the operation, the compressor 1, the condenser fan 8 and the freezing room fan 9 are efficiently operated, which leads to energy saving.

At this time, in order to prevent the freezing room 10 from being excessively supercooled (for example, a temperature of −21 ° C. or less), the switching temperature for the freezing room by the freezing room temperature sensor 13 is set. Higher (for example, the switching temperature is -2
Raise from 1 ° C to -19 ° C. As described above, the setting of the control device (not shown) is changed based on the respective room temperatures, and the control device (not shown) is changed based on the sensing state of the freezing room temperature sensing device 13 and the refrigerator compartment temperature sensing device 14. In the drawing, the refrigerating capacity of the compressor 1 is changed according to the required capacity, and the refrigerating chamber 10 and the refrigerating chamber 12 are switched to be operated at a lower capacity than when they are simultaneously cooled. The number of revolutions of the room fan 9 is also switched by a control device (not shown) in accordance with the rotation of the room fan 9 so as to be operated.

As described above, the freezing compartment 10 is not excessively cooled (supercooled), but can be appropriately maintained in a cooling state against the invasion of heat from the outside.
The number of FFs does not increase, and therefore, the power consumption required in a large amount at the time of starting the compressor 1 does not increase, the power consumption is small, and the refrigerator compartment 12 and the freezer compartment 10 can be efficiently cooled, and the efficiency can be further improved. The compressor 1, the condenser fan 8, and the freezing room fan 9 are operated, which leads to further energy saving.

At this time, as a means for changing the refrigerating capacity of the compressor, a method of reducing the number of rotations of the compressor motor and reducing the number of times of compression of the piston moving in conjunction therewith to reduce the amount of circulating refrigerant in the refrigeration cycle, and The throttle device 3 and the refrigerating room throttle device 6 are made into a throttle device including at least a switching type throttle device of a combination of a variable throttle valve or an on-off valve and a capillary tube adapted to several types of states,
A restricting state in which the refrigerant flow and the pressure difference match those states (for example, the restricting device 3 for the freezing room and the restricting device 6 for the refrigerating room are throttled in accordance with the reducing ability of the compressor 1).

[0023]

According to the present invention, since the refrigerator of the present invention has the above-described structure, the refrigerator and the freezer can obtain an optimum cooling effect in accordance with the load fluctuation, and have a low energy loss. A refrigerator having an efficient refrigeration cycle is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a refrigerator of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3 Refrigerating room throttle device 4 Refrigerating room evaporator 5 On-off valve 6 Refrigerating room throttle device 7 Refrigerating room evaporator 8 Condenser fan 9 Freezing room fan 10 Freezing room 11 Refrigerating room fan 12 refrigerator compartment 13 freezer compartment temperature sensing device 14 refrigerator compartment temperature sensing device

Claims (8)

[Claims] 1. A refrigerator having at least a refrigerator compartment and a freezer compartment, wherein each of the compartments is provided with a refrigerator compartment temperature sensing device and a freezer compartment temperature sensing device for sensing room temperature, and a compressor having variable capacity, and a refrigerating cycle. A refrigerating cycle comprising: a plurality of evaporators connected in parallel within each other; a throttling device provided corresponding to each of the evaporators; a condenser; and a refrigerant flow path; There is a refrigerator compartment evaporator and a freezer compartment evaporator respectively corresponding to the freezer compartment, and an opening / closing valve is provided between the condensing device and a throttle device connected to the refrigerator compartment evaporator of the refrigeration cycle, A refrigerator characterized in that, during a refrigeration cycle operation, the refrigerant flows into the refrigerator compartment evaporator and the freezer compartment evaporator at the same time, or the refrigerant flows only into the freezer compartment evaporator. 2. A refrigerator having at least a refrigerating compartment and a freezing compartment, wherein each of the compartments is provided with a refrigerating compartment temperature sensing device and a freezing compartment temperature sensing device for sensing room temperature, and a compressor having variable capacity, and a refrigerating cycle. A refrigerating cycle comprising: a plurality of evaporators connected in parallel within each other; a throttling device provided corresponding to each of the evaporators; a condenser; and a refrigerant flow path; And a freezer compartment evaporator and a freezer compartment evaporator, respectively, having a variable-speed fan for cooling each of the evaporators, and a refrigerator compartment evaporator of the refrigeration cycle. An opening / closing valve is provided between the expansion device connected to the condenser and the condenser, and during the refrigeration cycle operation, the refrigerant flows into the refrigerator compartment evaporator and the refrigerator compartment evaporator simultaneously, or only the refrigerator compartment evaporator. The refrigerant flows into the refrigerator compartment When the refrigerant is flowing through the evaporator and the freezer compartment evaporator, the refrigerator compartment fan and the freezer compartment fan are simultaneously operated, and when the refrigerant flows only through the freezer compartment evaporator, only the freezer compartment fan is operated. A refrigerator characterized by being driven. 3. The condenser fan according to claim 1, wherein a condenser fan for cooling at least a part of the condenser is provided, and the condenser fan is controlled by changing a rotation speed as needed. The refrigerator as described. 4. The refrigerating capacity of the compressor and the condensing capacity when the refrigerant flows through the refrigerator compartment evaporator and the freezer compartment evaporator at the same time and when the refrigerant flows only through the freezer compartment evaporator. 4. The refrigerator according to claim 1, wherein the number of rotations of the dexterous fan is changed and controlled as needed. 5. An evaporator for a refrigerator and a freezer when a room temperature of the refrigerator is equal to or higher than a predetermined temperature and a room temperature of the freezer is equal to or lower than a predetermined temperature. The refrigerator according to any one of claims 1 to 4, wherein a refrigerant is caused to flow at the same time as the evaporator for use, thereby reducing the number of revolutions of the fan for the condenser and reducing the refrigerating capacity of the compressor. 6. When the room temperature of the refrigerator is equal to or higher than a predetermined temperature and the room temperature of the refrigerator is equal to or lower than the predetermined temperature, the refrigerant is simultaneously supplied to the refrigerator evaporator and the freezer evaporator. The refrigerator according to any one of claims 1 to 5, wherein the temperature is set so that the switching temperature for the freezer compartment by the freezer compartment temperature sensing device is increased. 7. The squeezing device provided for each of the evaporators is of a variable type and is adjusted according to the sensed refrigerated room temperature and frozen room temperature. The refrigerator according to any one of the above. 8. The refrigerator according to claim 1, wherein the operation of the variable capacity compressor is controlled by both a refrigerator temperature sensor and a freezer temperature sensor.