JP3948924B2 - Freezer refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigerator-freezer provided with an evaporator for a refrigerator compartment and an evaporator for a freezer compartment.
[0002]
The refrigerator-freezer is provided with an evaporator and a fan in ducts formed on the back side of the freezer compartment and the refrigerator compartment, respectively, and refrigerant is supplied from the condenser of the refrigeration cycle to the evaporator, and the cold air passing through the duct Is cooled by exchanging heat with an evaporator, and the cold air is blown out from the outlet through the fan to the freezer compartment and the refrigerator compartment.
[0003]
This refrigeration cycle includes, for example, a compressor 1 that compresses refrigerant gas and a condenser 2 that liquefies the refrigerant gas, as shown in FIG. 3, and a three-way valve 3 is provided downstream of the condenser 2. By switching this three-way valve 3, both evaporators 4, 5, evaporator 4 (R evaporator) provided on the refrigerator compartment R side and evaporator 5 (F evaporator) provided on the freezer compartment F side, Alternatively, the refrigerant is supplied only to the F evaporator 5. Then, the refrigerant returns from the F evaporator 5 to the compressor 1. The refrigerant circulates in the refrigeration cycle. The cold air generated by the evaporators 4 and 5 is circulated in the cabinet by the fans 8 and 9.
[0004]
That is, this refrigerator-freezer has a first mode in which a refrigerant flows through both evaporators 4 and 5 and a second mode in which the refrigerant flows only through the freezer 5. Prepare.
[0005]
During normal operation, the three-way valve 3 is appropriately switched to allow the refrigerant to flow to the necessary evaporator.
[0006]
When the inside of the refrigerator is sufficiently cooled by the cooling operation of the refrigerator, the compressor 1 is turned off and the cooling operation is turned off.
[0007]
When this cooling operation is turned off, the three-way valve 3 closes both refrigerant flow paths. This stops the flow of the refrigerant, keeps the refrigerant in the freezer compartment evaporator 5, and maintains heat exchange (cooling action) by this refrigerant. That is, when the compressor 1 is turned off, the refrigerant flow path is closed, the refrigerant is retained in the freezer compartment evaporator 5, and the freezer compartment fan 9 is continuously rotated for 1-2 minutes to continue the cooling operation. .
[0008]
Thereby, energy saving of the refrigerator is achieved.
[0009]
[Problems to be solved by the invention]
However, in such a refrigerator-freezer, since the refrigerant flow path is closed, the pressure on the high-pressure side and the low-pressure side is also maintained.
[0010]
For this reason, the starting torque of the compressor 1 must operate well even at this high differential pressure.
[0011]
Conventionally, the compressor 1 is driven by an inverter to obtain a high torque. Moreover, when driving by direct supply of commercial power, the high torque compressor 2 had to be adopted. However, in this case, not only the compressor becomes expensive, but also the power consumption increases and the energy saving is reversed.
[0012]
That is, the energy-saving method that closes the refrigerant flow path when the compressor is off is only practical with an inverter-driven compressor.
[0013]
This invention is made | formed in view of such a present condition, and it aims at providing the refrigerator-freezer which can save energy even if it is a compressor of what kind of drive system.
[0014]
[Means for Solving the Problems]
The present invention provides the first mode in which the refrigerant flows through the evaporators (4, 5) of the refrigerator compartment evaporator (4) and the freezer compartment evaporator (5) and the refrigerant only in the freezer compartment evaporator (5). Valve means (3) for switching the flow path of the refrigerant to the second mode in which the refrigerant flows , wherein the valve means (3) is a refrigerator-freezer that closes the flow path when the compressor (1) is turned off .
The flow path is closed at the time of turning off and the fan (9) in the freezer compartment is continuously rotated, and the rotation is stopped after a predetermined time, and after the rotation is stopped, the valve means (3) is controlled to control the first means . A one-mode flow path is opened.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a refrigerator-freezer according to the present invention will be described. Here, the same reference numerals are used for the same members as in the conventional example described above.
[0019]
FIG. 1 shows an example of a refrigerator-freezer, which includes a refrigerator compartment R and a freezer compartment F. A duct 6 is formed on the back side of the refrigerator compartment R, and an R evaporator 4 and an R fan 8 are disposed in the duct 6. Similarly, in the freezer compartment F, a duct 7 is formed on the back side, and an F evaporator 5 and an F fan 9 are provided.
[0020]
In the refrigerator compartment R, the cold air in the duct 6 is cooled by heat exchange with the refrigerant when passing through the R evaporator 4, and the cold air is blown through the R fan 8 to form a plurality of blowouts formed in the refrigerator compartment R. It is blown out from the mouth 10 into the cabinet. A part of the cold air is blown downward from the grill 12 at the tip through the upper duct 6a. Thus, during normal operation, the refrigerator compartment R is operated at a temperature of about 3 ° C. The cold air blown into the chamber flows into the duct 6 from the lower return port 13 and is cooled again by the R evaporator 4 and then blown into the chamber.
[0021]
In the freezer compartment F, in a similar manner, the cold air in the duct 7 is cooled by heat exchange with the refrigerant when passing through the F evaporator 5. The cold air is blown out into the refrigerator through a plurality of outlets 11 formed in the freezer compartment F via the F fan 9. Thus, during normal operation, the freezer compartment F is operated so that the temperature is about -18 ° C. The cold air blown into the refrigerator flows into the duct 7 from the lower return port 14, is cooled again by the F evaporator 5, and then blown into the freezer compartment.
[0022]
The refrigeration cycle in the present embodiment is the same as the conventional one. A condenser 2 is connected to the compressor 1 as shown in FIG. 2, a three-way valve 3 is provided downstream of the condenser 2, and the refrigerator compartment R side. The R evaporator 4 and the three-way valve 3 installed in are connected by a capillary A. The F evaporator 5 installed on the freezer compartment F side and the three-way valve 3 are connected by a capillary B. The R evaporator 4 and the F evaporator 5 are connected. The F evaporator 5 and the compressor 1 are connected.
[0023]
The refrigerant gas is compressed by the compressor 1 and then liquefied by the condenser 2, and is supplied only to both the evaporators 4 and 5 or the F evaporator 5 by switching the three-way valve 3. Reference numeral 16 denotes a condenser fan.
[0024]
These components 1, 3, 8, 9, 16 are controlled by the control circuit 17. Reference numeral 18 denotes a temperature sensor for the refrigerator compartment, 19 denotes a temperature sensor for the freezer compartment, and 20 denotes an outside air temperature sensor.
[0025]
Control by the control circuit 17 in this refrigerator-freezer will be described.
[0026]
During the normal cooling operation, the first and second modes are switched as in the conventional case to perform appropriate cooling.
[0027]
In the first mode, the valve on the side communicating with the capillary A of the three-way valve 3 is opened, the valve communicating with the capillary B is closed, and the liquefied refrigerant from the condenser 2 is supplied to the R evaporator 4 and the F evaporator 5. The refrigerant is returned to the compressor 1 via the F evaporator 5.
[0028]
In the second mode, the valve on the side communicating with the capillary A of the three-way valve 3 is closed, the valve on the side communicating with the capillary B is opened, and the liquefied refrigerant from the condenser 2 is supplied only to the F evaporator 5. The refrigerant gas is returned to the compressor 1.
[0029]
While the compressor 1 is stopped, the room temperature is checked by the freezer temperature sensor 19 and the refrigerator temperature sensor 18.
[0030]
For example, the freezing room cooling operation start temperature is −15 ° C., and the cooling operation start temperature of the refrigerator compartment (R) is 6 ° C.
[0031]
Here, if the freezer temperature detected by the freezer temperature sensor 19 is −12 ° C. and the cold room temperature detected by the freezer temperature sensor 18 is 7 ° C., the cooling operation is performed in the first mode. Do. During the cooling operation, if the refrigerator compartment is sufficiently cooled (for example, 2 ° C.), the mode is switched to the second mode, and the cooling operation is continued and stopped until the freezing chamber is sufficiently cooled (for example, −20 ° C.).
[0032]
Further, when the compressor 1 is stopped, the freezer temperature detected by the freezer temperature sensor 19 is −12 ° C., and the cold room temperature detected by the cold room temperature sensor 18 is 4 ° C., Cooling operation is performed in the second mode.
[0033]
When the interior (freezer compartment) is sufficiently cooled by such a cooling operation, the compressor 1 is turned off. At this time, the three-way valve 3 is controlled to close both flow paths. Thereby, the flow of the refrigerant is stopped.
[0034]
The rotation of the F fan 9 is continued for 1 minute after the compressor 1 is turned off, the refrigerant is sublimated, and the cooling operation is continued.
[0035]
Then, after the rotation of the F fan 9 is stopped, the three-way valve 3 is controlled to open the refrigerator compartment side. Open the refrigerated chamber side, to reduce the differential pressure. Further, the attenuation of the differential pressure is practically required for several minutes. In this embodiment, the three-way valve 3 is opened immediately after the F fan 9 stops rotating. Furthermore, the compressor 1 of this embodiment is a type driven by direct supply of commercial power, and is not driven by an inverter.
[0036]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, in the refrigerator-freezer, the refrigerator-freezer which can prevent an increase in production cost and can save energy can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an example of a refrigerator-freezer.
FIG. 2 is a block for explaining a refrigeration cycle according to the present invention.
FIG. 3 is a block diagram of a refrigeration cycle in a conventional example.
[Explanation of symbols]
1 ... compressor,
2 ... condenser,
3 ... three-way valve,
4 ... R evaporator,
5 ... F evaporator,
8 ... R Juan,
9 ... F fans,
16… Condenser fan,
17 ... Control circuit,
A, B ... Capillary,
R ... Refrigerator room,
F ... Freezer room.

Claims (1)

The first mode in which the refrigerant flows through both the evaporators (4, 5) of the refrigerator compartment evaporator (4) and the freezer compartment evaporator (5), and the second mode in which the refrigerant flows only through the freezer compartment evaporator (5). and a mode provided with valve means (3) carried out by switching the flow path of the refrigerant, the valve means (3), in the flow path closed refrigerator when off the compressor (1),
The flow path is closed at the time of turning off and the fan (9) in the freezer compartment is continuously rotated, and the rotation is stopped after a predetermined time, and after the rotation is stopped, the valve means (3) is controlled to control the first means . A refrigerator-freezer characterized by opening a one-mode flow path.

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