JPH1062058A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the stress in a compressor generated in starting the compressor immediately after defrosting is completed by reducing the balance pressure in a refrigerating system which is increased when defrosting is completed. SOLUTION: A refrigerator comprises a compressor 18, an in-chamber fan device 23 to blow the cold air cooled in a cooler 21 into a chamber of the refrigerator, a defrosting device 24 to remove the frost attached to the cooler 21, and a machine room fan device 25 installed in a machine room of the refrigerator to improve the refrigerating cycle. Only the in-chamber fan device 23 is operated immediately after the defrosting control is completed, and immediately thereafter, the machine room fan device is operated to reduce the balance pressure in the refrigerating system and to prevent reduction of the flow rate of the refrigerant generated in starting the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control after defrosting a refrigerator.

[0002]

2. Description of the Related Art A conventional refrigerator is disclosed in Japanese Patent Laid-Open No. 7-4792.

Hereinafter, a control method after defrosting the above-described conventional refrigerator will be described with reference to the drawings. 5 is a refrigerator main body, 2 is a freezing room, 3 is a refrigerator, 4 is a machine room provided in the lower rear part of the refrigerator main body 1, 5 is a compressor installed in the machine room 4, 6 is a condenser, Reference numeral 7 denotes a capillary tube, 8 denotes a cooler, 9 denotes a suction pipe, 10 denotes a defroster, 11 denotes an internal fan device for blowing cool air cooled by the cooler 8 into a refrigerator, and 12 denotes the capillary tube 7. A bypass pipe 13 communicating with a connection portion of the suction pipe 9 is a two-way valve installed at an intermediate portion of the bypass pipe 12.

The refrigeration cycle operation of the refrigerator having the above-described structure after defrosting will be described below with reference to the flowchart of FIG.

First, in a refrigeration cycle, the high-temperature and high-pressure refrigerant discharged from the compressor 5 is liquefied in the condenser 6 and enters the capillary tube 7 where the pressure is reduced and the cooler 8 is cooled.
, And re-enters the compressor 5 through the suction pipe 9. The internal fan device 11 is operated together with the operation of the compressor 5, and the cool air cooled by the cooler 8 is blown into the refrigerator storage,
The freezer compartment 2 and the refrigerator compartment 3 are cooled.

[0006] With the lapse of time of the refrigeration cycle operation,
The cooler 8 starts the operation of the defrosting device 10 when the frost formation proceeds and the frost formation amount reaches a predetermined amount. After the completion of the defrosting, the compressor 5 and the in-compartment fan device 11 are operated to cool the inside of the refrigerator again.

However, when the compressor 5 is started, and particularly when the compressor 5 is started immediately after the end of defrosting, the suction pipe 9
In order to lower the temperature of the refrigerant flowing through the pipe, the two-way valve 13 is opened, the refrigerant in the two-layer state depressurized by the capillary tube 7 is mixed with the refrigerant heated by defrosting, and installed in heat exchange with the suction pipe 9. By cooling the capillary tube 7 thus heated, the flow rate of the refrigerant in the capillary tube 7 due to the heating is also maintained.

[0008]

However, in the above-described conventional configuration, the defrosting immediately after the completion of the defrost raises the balance pressure in the refrigeration system. There is a disadvantage that the life of the compressor is shortened if added repeatedly.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the balance pressure in a refrigeration system, which increases when defrosting is completed, and to prevent a decrease in the flow rate of refrigerant generated when the compressor is started.

[0010]

SUMMARY OF THE INVENTION In order to solve this problem, a refrigerator according to the present invention comprises a refrigerator body having a refrigeration cycle in which a compressor, a condenser, a capillary tube, a cooler, and a suction pipe are sequentially connected in a ring shape. And an in-compartment fan device for blowing the cool air of the cooler into the refrigerator compartment, a defrosting device for performing defrosting of the cooler, and starting the in-compartment fan device for a predetermined time immediately after the end of the defrosting. Further, immediately after that, a control means for operating the compressor after activating the machine room fan device for a predetermined time is constituted.

Further, the control means is configured to start the machine room fan device for a predetermined time immediately after the completion of the defrosting, and to start the compressor after immediately starting the internal fan device for a predetermined time immediately thereafter. is there. As a result, a reduction in the balance pressure in the refrigeration system after the completion of the defrosting can be obtained.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a compressor, a condenser, a capillary tube, a cooler,
A refrigerator body in which a refrigeration cycle in which suction pipes in which the capillary tubes are installed in a heat-exchange manner are sequentially connected in an annular manner, a refrigerator fan device for blowing cool air cooled by a cooler into a refrigerator refrigerator, and a refrigerator. After operating the internal fan device for a predetermined time immediately after the end of the defrosting control in the machine room fan device installed in the machine room for improving the performance of the refrigeration cycle and the defrosting device for removing frost adhering to the cooler. Further, the control is such that the machine room fan device is operated for a predetermined time, and when the cooler is defrosted by the defrost device, the balance pressure in the refrigeration system once decreases, but gradually increases, and the defrost ends. Sometimes maximum. Then, immediately after the completion of the defrosting, when the in-compartment fan device that blows the cool air of the cooler into the refrigerator compartment is started for a predetermined time, the temperature of the cooler is reduced due to the stirring by the in-compartment fan and the forced convection of the low ambient temperature around the cooler is performed. Heat transfer reduces the balance pressure in the refrigeration system accordingly. Further, immediately after that, since the machine room fan device is started for a predetermined time, the temperature of the entire compressor can be reduced, and the balance pressure in the refrigeration system can be further reduced. After some time,
When the refrigeration cycle including the lowered cooler is started, that is, when the compressor is started, the high-temperature gas flows through the suction pipe and the capillary tube is not abnormally heated, so that a decrease in the refrigerant flow rate can be prevented. Further, the reduction of the balance pressure in the refrigeration system also has the effect of reducing the stress applied to the compressor when starting the compressor.

According to a second aspect of the invention, immediately after the defrosting control is completed, the machine room fan device is operated for a predetermined time, and then the internal fan device is further operated for a predetermined time. Immediately after starting the machine room fan device installed in the machine room where the compressor, condenser, etc. are installed, the temperature of the compressor body and the condenser becomes lower than the ambient temperature around the machine room due to stirring by the machine room fan device. Decreased by forced convection heat transfer, thereby reducing the balance pressure in the refrigeration system. Immediately after that, in order to start the internal fan device for a predetermined time, stirring by the internal fan,
This has the effect of lowering the temperature of the cooler due to forced convection heat conduction at a low ambient temperature around the cooler, and further reducing the balance pressure in the refrigeration system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.

(Embodiment 1) FIGS. 1 and 2 are diagrams schematically showing a refrigeration system of a refrigerator according to the present invention.

In FIG. 1, 14 is a refrigerator body, 15 is a refrigerator, 16 is a freezing room, 17 is a vegetable room, 18 is a compressor,
19 is a condenser, 20 is a capillary tube, 21 is a cooler, 22 is a suction pipe, 23 is a fan device in a refrigerator,
24 is a defrosting device.

In FIG. 2, reference numeral 25 denotes a machine room fan device for cooling the compressor 18 and the condenser 19.

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

First, usually in a refrigeration cycle, the high-temperature and high-pressure refrigerant discharged from the compressor 18 is liquefied in the condenser 19 and enters the capillary tube 20, where it is evaporated in the depressurized cooler 21 and is evaporated in the suction pipe 22. Through the compressor 18 again.

The operation of the compressor 18 and the operation of the in-compartment fan device 23 allow the cool air cooled by the cooler 21 to be cooled.
5. Ventilation is sent to the freezing room 16 and the vegetable room 17, and the interior of each refrigerator is cooled.

Further, the machine room fan device 25 is operated together with the operation of the compressor 18 to cool the compressor 18 and the condenser 19.

With the lapse of time of the refrigeration cycle operation,
The cooler 21 starts the operation of the defrosting device 24 when the frost formation advances and reaches a predetermined frost formation amount. When the cooler 21 is defrosted by the defrosting device 24, the balance pressure in the refrigeration system once decreases, but gradually increases, and reaches a maximum at the end of the defrosting.

Immediately after the completion of the defrosting, only the in-compartment fan device 23 for blowing the cool air of the cooler 21 into the refrigerator compartment is activated for several tens of seconds. Reduced by forced convection heat transfer at low ambient temperatures, and accordingly the balance pressure in the refrigeration system is reduced.

Immediately after that, when the machine room fan device 25 for cooling the machine room in which the compressor 5, the condenser 19 and the like are mounted is started for several tens of seconds, the compressor 18 body and the condenser temperature are stirred by the machine room fan. Is reduced by forced convection transmission of the ambient temperature around the machine room, and the balance pressure in the refrigeration system is further reduced accordingly. Thereafter, the refrigeration cycle including the lowered cooler 21 is started, that is, the compressor 18
Start.

As described above, in the refrigerator according to the present embodiment, only the internal fan device is activated for several tens of seconds immediately after the end of defrosting, and immediately thereafter, the machine room fan device is activated. When the temperature of the cooler decreases, the high-temperature gas at the time of starting the next compressor does not flow through the suction pipe, and does not abnormally heat the capillary tube. Further, the balance pressure in the refrigeration system is reduced due to the decrease in the cooler temperature, and the response to the compressor at the time of starting the compressor is reduced, which leads to an improvement in the life of the compressor.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to the drawings. The same components as those in the first embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and the operation will be described with reference to the flowchart of FIG.

First, as a refrigeration cycle, the high-temperature and high-pressure refrigerant discharged from the compressor 18 is liquefied in the condenser 19 and enters the capillary tube 20, where the pressure is reduced and evaporated in the cooler 21, and the suction pipe 22 is discharged. Again enters the compressor 18.

The in-compartment fan device 23 is operated together with the operation of the compressor 18, and the cool air cooled by the cooler 21 is supplied to the refrigerator compartment 1.
5. Ventilation is sent to the freezing room 16 and the vegetable room 17, and the interior of each refrigerator is cooled.

Further, the machine room fan device 25 is operated together with the operation of the compressor 18 to cool the compressor 18 and the condenser 19.

With the lapse of time of the refrigeration cycle operation,
The cooler 21 starts the operation of the defrosting device 24 when the frost formation advances and reaches a predetermined frost formation amount. When the cooler 21 is defrosted by the defrosting device 24, the balance pressure in the refrigeration system once decreases, but gradually increases, and reaches a maximum at the end of the defrosting.

Immediately after the completion of defrosting, when only the in-compartment fan device 23 that blows cool air from the cooler 21 into the refrigerator compartment is started for several tens of seconds, the temperature of the cooler around the cooler becomes low due to stirring by the in-compartment fan. It is reduced by forced convection heat transfer at ambient temperature, thereby reducing the balance pressure in the refrigeration system.

Immediately after that, when the machine room fan device 25 for cooling the machine room in which the compressor 5, the condenser 19 and the like are mounted is started for several tens of seconds, the compressor 18 body and the condenser temperature are stirred by the machine room fan. Is reduced by forced convection transmission of the ambient temperature around the machine room, and the balance pressure in the refrigeration system is further reduced accordingly.

Thereafter, the refrigeration cycle including the lowered cooler 21 is started, that is, the compressor 18 is started.

As described above, in the refrigerator of the present invention, only the internal fan device is activated for several tens of seconds immediately after the completion of defrosting, and the mechanical room fan device is activated immediately thereafter. When the compressor temperature drops, the high temperature gas at the time of starting the next compressor does not flow through the suction pipe and does not abnormally heat the capillary tube, so that a decrease in the flow rate of the refrigerant can be prevented. Further, the balance pressure in the refrigeration system is reduced due to the decrease in the cooler temperature, and the stress applied to the compressor at the time of starting the compressor is also reduced, which leads to an improvement in the life of the compressor.

[0035]

As described above, according to the present invention, a compressor,
A condenser body, a capillary tube, a cooler, a refrigerator body in which a refrigeration cycle in which suction pipes in which the capillary tubes are installed in a heat-exchange manner are sequentially connected in an annular shape, and cool air cooled by the cooler are placed in the refrigerator compartment. It consists of an internal fan device for blowing air, a machine room fan device installed in the refrigerator machine room for improving the performance of the refrigeration cycle, and a defrosting device for removing frost adhering to the cooler. Immediately after the control is completed, the internal fan device is operated for a predetermined time, and then the machine room fan device is further operated for a predetermined time, so that the cool air of the cooler is blown into the refrigerator immediately after the defrost is completed. When the in-compartment fan device is started for a predetermined time, the temperature of the cooler is reduced by forced convection heat transfer at a low ambient temperature around the cooler due to stirring by the in-compartment fan. Brought balance the pressure in the refrigeration system is reduced. Further, immediately after that, since the machine room fan device is started for a predetermined time, the temperature of the entire compressor can be reduced, and the balance pressure in the refrigeration system can be further reduced. After the elapse of time, when the refrigeration cycle including the lowered cooler is started, that is, when the compressor is started, the high-temperature gas flows through the suction pipe and does not abnormally heat the capillary tube, thereby preventing a decrease in the refrigerant flow rate. . Further, the effect of reducing the stress applied to the compressor when the compressor is started can be obtained by reducing the balance pressure in the refrigeration system.

In addition, since the machine room fan device is operated for a predetermined time immediately after the end of the defrosting control, and further the internal fan device is operated for a predetermined time, the compressor and the condensing unit are operated immediately after the defrosting is completed. When the machine room fan device installed in the machine room with the compressor etc. is started for a predetermined time, the temperature of the compressor body and the condenser decreases due to forced convection heat transfer of the ambient temperature around the machine room due to stirring by the machine room fan device And
The balance pressure in the refrigeration system decreases accordingly. Immediately thereafter, in order to start the in-compartment fan device for a predetermined time, the temperature of the cooler is reduced by forced convection heat conduction at a low ambient temperature around the cooler by stirring by the in-compartment fan. The effect of reducing the balance pressure is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a refrigerator according to a first embodiment of the present invention.

FIG. 2 is a schematic view of a machine room showing a refrigerator according to the first embodiment of the present invention.

FIG. 3 is a control flowchart according to the first embodiment of the present invention;

FIG. 4 is a control flowchart according to a second embodiment of the present invention;

FIG. 5 is a sectional view showing a conventional refrigerator.

FIG. 6 is a conventional control flowchart.

[Explanation of symbols]

 14 Refrigerator body 15 Refrigerator room 16 Freezer room 17 Vegetable room 18 Compressor 19 Condenser 20 Capillary tube 21 Cooler 22 Suction pipe 23 Inside fan device 24 Defroster 25 Machine room fan device

Claims (2)

[Claims] 1. A compressor, a condenser, a capillary tube,
A refrigerator, in which a refrigerator and a refrigeration cycle in which suction pipes in which the capillary tubes are installed in a heat-exchange manner are sequentially connected in an annular manner, and an in-compartment fan device for blowing cool air cooled by the cooler into the refrigerator compartment And a machine room fan device installed in the refrigerator machine room for improving the performance of the refrigeration cycle, and a defrost device for removing frost adhering to the cooler, the fan device in the refrigerator immediately after the end of the defrost control for a predetermined time. And a control for operating the machine room fan device for a predetermined time after the operation. 2. The refrigerator according to claim 1, further comprising control for operating the machine room fan device for a predetermined time immediately after the defrosting control is completed, and then further operating the internal fan device for a predetermined time.