JPH1038430A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mitigate the load on a compressor without a bad influence on stored foods by stopping an air fan when the outdoor temperature is high. SOLUTION: When a defrosting completion sensor 32 detects a temperature higher than a set temperature immediately after a power is turned on and a condenser temperature sensor 27 detects a temperature DC of not less than an upper limit set value DCmax after a specified period of time has elapsed since the power is turned on, a small capacity running capacitor 28 is switched over to a large capacity running capacitor 29 for a predetermined period of time. Thereby, as the rotative speed of a PSC fan motor 26 is increased and the performance of a machine room radiator is improved, a rise in the delivery pressure of a compressor 4 is moderated and the load on the compressor 4 is mitigated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to reduction of load on a compressor in a refrigerator.

[0002]

2. Description of the Related Art As a conventional control for reducing the load applied to a compressor in a refrigerator, for example, Japanese Patent Application Laid-Open No. 5-240554 is known.

An example of a conventional refrigerator will be described below with reference to FIGS. 9, 10, 11 and 12. 9 is a longitudinal sectional view of a conventional refrigerator, FIG. 10 is a block diagram showing a schematic electric configuration of the refrigerator, FIG. 11 is a flowchart of control of the refrigerator, and FIG. 12 is a change characteristic diagram of a discharge pressure of a compressor in the refrigerator. It is.

In FIG. 9, a refrigerator body 1 has a structure including a freezer compartment 2 and a refrigerator compartment 3, and each compartment has a door (doors for the refrigerator compartment 2 and the refrigerator compartment 3 are denoted by reference numerals 2a and 3a, respectively). ) Is attached, and a compressor 4 is arranged at a lower portion of the rear surface thereof.

[0005] A cooling chamber 5 is formed at the back of the freezing chamber 2, and a cooler 6, a blower fan 7 and a defrost heater 8 are installed in the cooling chamber 5. Is provided with a freezer compartment temperature sensor 9.

[0006] A damper device 1 is provided at a rear portion of the refrigerator compartment 3.
0 and a temperature control device 12 having the cooling chamber temperature sensor 11 built therein, and the damper device 10 and the cooling chamber 5
Are connected by a duct 13. The freezer compartment door 2a
The greenhouse sensor 14 is installed in the lower part of the front.

In FIG. 10, a freezer compartment temperature sensor 9 generates a temperature detection signal corresponding to the temperature of the refrigerator compartment 2, a refrigerator compartment temperature sensor 11 generates a temperature detection signal corresponding to the temperature of the refrigerator compartment 3, and The sensor 14 is configured to generate a temperature detection signal corresponding to the installation atmosphere temperature DA of the refrigerator main body 1, and these temperature detection signals are given to the control circuit 15.

[0008] The defrost timer 16 generates a defrost signal every predetermined defrost cycle, and the defrost signal is provided to the control circuit 15. The control circuit 15 includes, for example, a microcomputer, and is configured to be supplied with power from a plug 17 connected to a commercial AC power supply via a DC power supply circuit 18.

The control circuit 15 relays the power supply to the compressor 4, the blower fan 7, the damper device 10, and the defrost heater 8 based on the input signals and the control program stored in advance. 19 through 22.

FIG. 11 shows only a part of the control by the control circuit 15 that is relevant to the gist of the present invention, which will be described below.

When the power is turned on, the compressor 4 and the blower fan 7 start operating (step S1), and wait in this state until a predetermined time ΔT1 has elapsed (step S2). When the time ΔT1 has elapsed, it is determined whether the temperature DS detected by the room temperature sensor 14 is equal to or higher than a predetermined upper limit temperature Dmax (step 3).

When the detected temperature DA is lower than the upper limit temperature Dmax, the normal control routine S7 is executed as it is, but when the detected temperature DA is higher than the upper limit temperature Dmax, that is, when the input load to the compressor 4 is reduced. Under the increasing condition, the blower fan 7 is stopped (step S4), and waits until the preset time ΔT2 has elapsed (step S5).

Thereafter, after ΔT2 has elapsed, the power supply to the blower fan 7 is restarted (step S6), and thereafter, the process proceeds to the normal control routine S7. The normal routine S7 is very general, and controls the operation of the compressor 4 and the blower fan 7 based on the temperature detection signal from the freezing room temperature sensor 9, and converts the operation to the temperature detection signal from the refrigerator compartment temperature sensor 11. Open / close control of the damper device 10 is performed based on the defrost signal from the defrost timer 16.
Is controlled.

FIG. 1 shows the operation in such control.
This will be described with reference to FIG. When the refrigerator is transported in summer and the power is turned on, the discharge-side pressure of the compressor 4 rapidly rises with the passage of time, and the load applied to the compressor 4 increases in proportion thereto.

Thereafter, when ΔT1 has elapsed (discharge-side pressure Pd1)
In addition, the detection temperature DA of the greenhouse sensor 14 is equal to the upper limit temperature Dma.
If it is equal to or more than x, the blower fan 7 stops for the time of ΔT2, and during this time, the amount of heat exchange between the cooler 6 and the air in the refrigerator decreases, and the discharge side pressure Pd of the compressor 4 also decreases. The input load to the compressor 4 also decreases.

However, during this time, since the operation of the compressor 4 is continued, the refrigerant continues to circulate in the cooling system, and the temperature of the cooler 6 decreases. Thereafter, after the elapse of ΔT2, when the operation of the blower fan 7 is restarted, the discharge side pressure Pd of the compressor 4 exhibits a relatively low value because the temperature of the cooler 6 has sufficiently decreased, and is relatively lower than when the power is turned on. After rising with a gentle curve and showing the maximum value Pdmax, the value is settled to a value corresponding to the temperature of the cooler 6, and the increase in the input load to the compressor 4 is also suppressed.

[0017]

However, in the above configuration, when the outside air temperature is high (that is, when DA ≧ Dmax),
Since the blower fan stops during ΔT2, the blowing of cool air to the freezing compartment and the refrigerator compartment is stopped, and the time for cooling to a predetermined temperature is prolonged, which has a problem of adversely affecting the preserved food.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is to reduce the load on a compressor without stopping a blower fan.

[0019]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a refrigerator according to the present invention comprises a machine room accommodating a machine room radiator which is a part of a compressor and a condenser, and a machine for cooling the machine room radiator. Room fan and PS to drive machine room fan
C fan motor, small-capacity running condenser provided in the circuit of PSC fan motor, large-capacity running condenser, defrosting completion detection sensor installed in cooler, and condensation detecting temperature of condenser Temperature sensor, means for controlling the driving of the PSC fan motor, means for switching between a small-capacity running condenser and a large-capacity running condenser. When a predetermined time has elapsed after power-on when a temperature equal to or higher than the set temperature is detected, and when the condenser temperature sensor temperature is higher than the upper limit set temperature, the capacity of the large-capacity running capacitor is reduced from a small-capacity running capacitor for a preset time. It is configured to switch to a running capacitor.

In addition, a defrosting completion detection sensor installed in the cooler and a means for detecting a power input value of the refrigerator body are provided, and when the temperature of the defrosting completion detection sensor is equal to or higher than a set temperature immediately after the power is turned on. After a lapse of a predetermined time after the power is turned on, when the power input detecting means detects a value equal to or higher than the upper limit set value, the running capacitor is switched from the small-capacity running capacitor to the large-capacity running capacitor for a preset time. It is.

Further, a defrosting completion detection sensor installed in the cooler and means for detecting a high pressure value of the refrigerator body are provided. When the temperature of the defrosting completion detection sensor is equal to or higher than a set temperature immediately after the power is turned on. After a lapse of a predetermined time after the power is turned on, when the power input detecting means detects a value equal to or higher than the upper limit set value, the running capacitor is switched from the small-capacity running capacitor to the large-capacity running capacitor for a preset time. It is.

Thus, the load on the compressor is reduced without stopping the blower fan.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a machine room accommodating a machine room radiator which is a part of a compressor and a condenser, a machine room fan for cooling the machine room radiator, A PSC fan motor for driving the machine room fan, a small-capacity running condenser provided in the circuit of the PSC fan motor, a large-capacity running condenser, a defrost end detection sensor installed in the cooler, and condensation. A condenser temperature sensor for detecting the temperature of the condenser, a means for controlling the driving of the PSC fan motor, a means for switching between a small-capacity running condenser and a large-capacity running condenser, and a defrost end detection sensor immediately after power-on When the temperature of the condenser is detected to be equal to or higher than the set temperature, and after a predetermined time elapses after the power is turned on, when the temperature of the condenser temperature sensor is equal to or higher than the upper limit set temperature, Because switched from just capacity small running capacitor preset time, which switches to the capacitance sized running capacitor to the case, capacity-sized running capacitor in, PS
The number of revolutions of the C fan motor is increased, the heat radiation performance of the machine room radiator is improved, and the pressure on the compressor discharge side is also moderately increased, so that the load on the compressor is reduced.

Also, the cooling performance is improved because the heat radiation performance of the machine room radiator is improved without stopping the blower fan, the time required to reach a predetermined temperature is shortened, and the adverse effect on the preserved food is not caused. Disappears.

According to a second aspect of the present invention, there is provided a machine room accommodating a machine room radiator which is a part of a compressor and a condenser, a machine room fan for cooling the machine room radiator, and a machine room fan. A PSC fan motor that drives the PSC fan motor, a small-capacity running capacitor provided in the circuit of the PSC fan motor, a large-capacity running capacitor, a defrosting end detection sensor installed in the cooler, and a refrigerator power input. Means for controlling the driving of the PSC fan motor, means for switching between a small-capacity running capacitor and a large-capacity running condenser, and the temperature of the defrost end detection sensor is set to a temperature equal to or higher than the set temperature immediately after power-on. At the time of detection, after a lapse of a predetermined time after turning on the power, if the power input detection means detects the upper limit set value or more, only for a preset time. From the amount small of running capacitor,
The switching to the large-capacity running condenser is performed, and in this case, the switching to the large-capacity running condenser increases the rotation speed of the PSC fan motor, improves the heat radiation performance of the machine room radiator, and reduces the discharge pressure of the compressor. The load on the compressor is also reduced because the rise is slow.

On the other hand, the cooling performance is improved because the heat radiation performance of the machine room radiator is improved without stopping the blower fan, and the time required to reach a predetermined temperature is shortened. Disappears.

According to a third aspect of the present invention, there is provided a machine room accommodating a machine room radiator which is a part of a compressor and a condenser, a machine room fan for cooling the machine room radiator, and a machine room fan. A PSC fan motor that drives the PSC fan motor, a small-capacity running capacitor provided in the circuit of the PSC fan motor, a large-capacity running capacitor, a defrosting end detection sensor installed in the cooler, and a high-pressure pressure of the refrigerator. Means for controlling the driving of the PSC fan motor, means for switching between a small-capacity running capacitor and a large-capacity running condenser, and the temperature of the defrost end detection sensor is set to a temperature equal to or higher than the set temperature immediately after power-on. At the time of detection, after a lapse of a predetermined time after the power is turned on, if the high-pressure pressure detecting means detects the upper limit set value or more, only for a preset time. From the amount small of running capacitor,
The switching to the large-capacity running condenser is performed, and in this case, the switching to the large-capacity running condenser increases the rotation speed of the PSC fan motor, improves the heat radiation performance of the machine room radiator, and reduces the discharge pressure of the compressor. The load on the compressor is also reduced because the rise is slow.

On the other hand, without stopping the blower fan, the heat radiation performance of the machine room heat radiator is improved, so that the cooling performance is improved, the time required to reach a predetermined temperature is shortened, and the stored food is not adversely affected. Disappears.

An embodiment of the present invention will be described below with reference to FIGS. (Embodiment 1) A first embodiment of the present invention will be described with reference to FIGS. The same components as those of the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a front view of a machine room of a refrigerator according to a first embodiment of the present invention. Reference numeral 23 denotes a machine room, in which a compressor room 4 and a machine room radiator 24 which is a part of the condenser are housed. 25 is a machine room fan that cools the machine room radiator 24, 26 is a PSC fan motor that drives the machine room fan 25, and 27 is a condenser temperature sensor that detects the temperature of the condenser.

FIG. 2 is a block diagram showing a schematic electric configuration of the refrigerator according to the first embodiment of the present invention, and FIG. 3 is a flowchart of control of the refrigerator according to the first embodiment of the present invention.

In FIG. 2, the control circuit 33 includes a microcomputer, and is supplied with power from a plug 17 connected to a commercial AC power supply through a DC power supply circuit 18, and has a freezer compartment temperature. Sensor 9, refrigerator temperature sensor 11, defrost end detection sensor 32, defrost timer 1
6. The compressor 4, the blower fan 7, the damper device 10, and the defrost heater 8 are supplied to the compressor 4, the blower fan 7, the defrost heater 8 and the PSC fan motor 26 based on a control program stored in advance by receiving an input signal generated from the condenser temperature sensor 27. The power supply to the small-capacity running capacitor 28 and the large-capacity running capacitor 29 provided in the circuit is controlled by the relays 19 to 22 and the small-capacity running capacitor 28.
And a relay 31 that connects a large-capacity running capacitor 29.

FIG. 4 is a graph showing a change characteristic of the pressure on the discharge side of the compressor in the refrigerator of the present invention.

With respect to the refrigerator configured as described above,
Hereinafter, the control will be described. FIG. 3 shows the control circuit 33.
Of the control according to the present invention, only a portion relevant to the gist of the present invention is shown, and this will be described below. When the power is turned on, the compressor 4, the blower fan 7, and the PSC fan motor 26 start operating with the small-capacity running condenser 28 (step P1).

Immediately thereafter, it is determined whether or not the detected temperature DE of the defrost end detecting sensor 32 is equal to or higher than a set value DEmax (for example, 35 ° C.) (step P2).

If the detected temperature DE is less than the set value DEmax, the normal routine P8 is executed as it is. If the detected temperature DE is equal to or more than the set value DEmax, that is, at the time of high outside air temperature and uncooled When it is detected that the time has elapsed, the apparatus waits in this state until a predetermined time ΔT1 has elapsed (step 3).

When the time ΔT1 has elapsed, it is determined whether or not the temperature DC detected by the condenser temperature sensor temperature 27 is equal to or higher than a predetermined upper limit temperature DCmax (step P).
4).

The detected temperature DC is equal to the upper limit temperature DCmax.
If less than the normal control routine P8
When the detected temperature DC is equal to or higher than the upper limit temperature DCmax, that is, when the input load to the compressor 4 is increasing, the running capacitor 29 is switched to the large-capacity running capacitor 29 (step P5), and the preset value is set. Time
It waits until T2 has elapsed (step P6).

Thereafter, after ΔT2 has elapsed, the running capacitor 28 is switched to the small-capacity running capacitor 28 (step P7), and then the routine shifts to the normal control routine P8. The normal routine P8 is very general, and the freezing room temperature sensor 9
The operation control of the compressor 4, the blower fan 7 and the PSC fan motor 26 is performed based on the temperature detection signal from the chiller, and the opening / closing control of the damper device 10 is performed based on the temperature detection signal from the refrigerator compartment temperature sensor 11. The energization control of the defrost heater 8 is performed based on the defrost signal from 16.

FIG. 4 shows the operation in such control.
This will be described with reference to FIG. The conditions for transporting and installing the refrigerator in summer, that is, when the outdoor temperature is high and not cooled (DE ≧ DEm
In ax), when the power is turned on, the discharge side pressure of the compressor 4 rapidly rises with the passage of time, and the load applied to the compressor 4 increases in proportion thereto.

Thereafter, when ΔT1 has elapsed (discharge-side pressure Pd1)
If the detected temperature DC of the condenser temperature sensor 27 is equal to or higher than the upper limit temperature DCmax, the PSC that drives the machine room fan 25 for cooling the machine room radiator 24 for the time of ΔT2
When the circuit of the fan motor 26 is switched from the small-capacity running condenser 28 to the large-capacity running condenser 29, the rotation speed of the PSC fan motor 26 increases, the heat radiation performance of the machine room radiator 24 improves, and the discharge side pressure of the compressor 4 increases. The load on the compressor is reduced because the rise of Pd is also moderate.

After ΔT2 has elapsed, when the large-capacity running condenser 29 is switched to the small-capacity running condenser 28, the discharge-side pressure P of the compressor 4 is changed.
Since the temperature of the cooler 6 has also been lowered, d has a relatively low value and rises with a gentler curve than when the power is turned on, and after stabilizing after showing the maximum value Pdmax,
An increase in the input load to the compressor 4 is also suppressed.

Also, without stopping the blower fan 7, the cooling performance is improved because the heat radiation performance of the machine room radiator 24 is improved, and the time required to reach a predetermined temperature is shortened. Will not give.

(Embodiment 2) A second embodiment of the present invention will be described with reference to FIGS. Note that the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a front view of a machine room of a refrigerator according to a second embodiment of the present invention. Reference numeral 25 denotes a machine room fan that cools the machine room radiator 24, and reference numeral 26 denotes a PSC fan motor that drives the machine room fan 25. FIG. 5 is a block diagram showing a schematic electric configuration of the refrigerator according to the second embodiment of the present invention, and FIG. 6 is a control flowchart of the refrigerator according to the second embodiment of the present invention. In FIG. 5, reference numeral 34 denotes a power input detection means, which generates a signal corresponding to a power input value.

The control circuit 35 includes a microcomputer, and is supplied with power from a plug 17 connected to a commercial AC power supply via a DC power supply circuit 18.
It receives the input signals generated from the freezer compartment temperature sensor 9, the refrigerator compartment temperature sensor 11, the defrost end detection sensor 32, the defrost timer 16 and the power input detection means 34, and based on a control program stored in advance, the compressor 4 in the previous period. ,
To the blower fan 7, the damper device 10 and the defrost heater 8,
Also, the PSC fan motor 26 is controlled by the relays 19 to 22 and the relay 30, which connects the small-capacity running capacitor 28, to the small-capacity running capacitor 28 and the large-capacity running capacitor 29 provided in the circuit. It is configured to execute the processing via a relay 31 that connects a large running capacitor 29.

Regarding the refrigerator configured as described above,
Hereinafter, the control will be described. FIG. 7 shows a control circuit 35.
Of the control according to the present invention, only a portion relevant to the gist of the present invention is shown, and this will be described below. When the power is turned on, the compressor 4, the blower fan 7, and the PSC fan motor 26 start operating with the small-capacity running condenser 28 (step P1).

Immediately thereafter, it is determined whether or not the detected temperature DE of the defrost end detecting sensor 32 is equal to or higher than a set value DEmax (for example, 35 ° C.) (step P2).

When the detected temperature DE is lower than the set value DEmax, the normal routine P8 is executed as it is, but when the detected temperature DE is higher than the set value DEmax, that is, at the time of high outside air temperature and uncooled. When it is detected that the time has elapsed, the process waits in this state until a predetermined time ΔT1 has elapsed (step P3).

When the time ΔT1 has elapsed, the detected input value W of the power input detecting means 34 becomes equal to a predetermined upper limit set value Wmax.
It is determined whether there is the above (step P4).

The detected input value W is equal to the upper limit set value Wmax.
If less than the normal control routine P8
When the detected input value W is equal to or greater than the upper limit set value Wmax, that is, when the input load to the compressor 4 is increasing, the running capacitor 29 is switched to the large-capacity running capacitor 29 (step P5). Set time △
It waits until T2 has elapsed (step P6).

Thereafter, after ΔT2 has elapsed, switching to the small-capacity running capacitor 28 is performed (step P7), and thereafter, the routine shifts to the normal control routine P8.

The normal routine P8 is very general, and controls the operation of the compressor 4, the blower fan 7, and the PSC fan motor 26 based on a temperature detection signal from the freezing room temperature sensor 9, and calculates the temperature of the refrigerator compartment. Sensor 1
1, the opening / closing control of the damper device 10 is performed based on the temperature detection signal, and the energization control of the defrost heater 8 is performed based on the defrost signal from the defrost timer 16.

FIG. 4 shows the operation in such control.
This will be described with reference to FIG. Conditions for transporting and installing the refrigerator in summer, that is, when the outdoor temperature is high and not cooled (DE ≧ D
In Emax), when the power is turned on, the discharge side pressure of the compressor 4 sharply increases with time, and the load applied to the compressor 4 increases in proportion thereto.

Thereafter, when ΔT1 has elapsed (discharge-side pressure Pd1)
If the detection input value W of the power input detection means 34 is equal to or more than the upper limit set value Wmax, the circuit of the PSC fan motor 26 that drives the machine room fan 25 for cooling the machine room radiator 24 for the time of ΔT2 is used. When switching from the small-capacity running condenser 28 to the large-capacity running condenser 29, the rotation speed of the PSC fan motor 26 is increased, the heat radiation performance of the machine room radiator 24 is improved, and the rise of the discharge side pressure Pd of the compressor 4 is also moderate. Therefore, the load on the compressor is reduced.

After ΔT2 has elapsed, the running condenser 29 is switched from the large-capacity running condenser 29 to the small-capacity running condenser 28.
Since the temperature of the cooler 6 has also been lowered, d has a relatively low value and rises with a gentler curve than when the power is turned on, and after stabilizing after showing the maximum value Pdmax,
The increase in the input load to the compressor 4 is also controlled.

Further, without stopping the blower fan 7, the cooling performance is improved because the heat radiation performance of the machine room radiator 24 is improved, and the time required to reach a predetermined temperature is shortened. Will give.

(Embodiment 3) A third embodiment of the present invention will be described with reference to FIGS. Note that the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a front view of a machine room of a refrigerator according to a third embodiment of the present invention. Reference numeral 25 denotes a machine room fan that cools the machine room radiator 24, and reference numeral 26 denotes a PSC fan motor that drives the machine room fan 25. FIG. 7 is a block diagram showing a schematic electric configuration of a refrigerator according to the third embodiment of the present invention, and FIG. 8 is a flowchart of control of the refrigerator according to the third embodiment of the present invention.

In FIG. 2, reference numeral 36 denotes a high pressure detecting means, which generates a signal corresponding to the high pressure value.

The control circuit 37 includes a microcomputer, and is supplied with power from a plug 17 connected to a commercial AC power supply via a DC power supply circuit 18.
Upon receiving input signals generated from the freezing room temperature sensor 9, the refrigerator compartment temperature sensor 11, the defrosting end detecting sensor 32, the defrosting timer 16, and the high pressure detecting means 36, and based on a control program stored in advance, the compressor 4 ,
To the blower fan 7, the damper device 10 and the defrost heater 8,
The PSC fan motor 26 is connected to the relays 19 to 22 and the small-capacity running capacitor 28 by controlling the energization of the small-capacity running capacitor 28 and the large-capacity running capacitor 29 provided in the circuit. It is configured to execute the processing via a relay 31 that connects a large running capacitor 29.

With respect to the refrigerator configured as described above,
Hereinafter, the control will be described. FIG. 8 shows the control circuit 37.
Of the control according to the present invention, only a portion relevant to the gist of the present invention is shown, and this will be described below. When the power is turned on, the compressor 4, the blower fan 7, and the PSC fan motor 26 start operating with the small-capacity running condenser 28 (step P1). Immediately thereafter, it is determined whether or not the detected temperature DE of the defrost end detection sensor 32 is equal to or higher than a set value DEmax (for example, 35 ° C.) (Step P)
2).

When the detected temperature DE is lower than the set value DEmax, the normal routine P8 is executed as it is, but when the detected temperature DE is higher than the set value DEmax, that is, at the time of high outside air temperature and uncooled. When it is detected that the time has elapsed, the process waits in this state until a predetermined time ΔT1 has elapsed (step P3).

When the time ΔT1 has elapsed, the detected pressure value P of the high pressure detecting means 36 becomes equal to a predetermined upper limit set value Pmax.
It is determined whether there is the above (step P4).

The detected pressure value P is equal to the upper limit set value Pmax.
If less than the normal control routine P8
When the detected pressure value P is equal to or higher than the upper limit set value Pmax, that is, when the input load to the compressor 4 is increasing, the running capacitor 29 is switched to the large-capacity running capacitor 29 (step P5). Set time △
It waits until T2 has elapsed (step P6).

Thereafter, after ΔT2 has elapsed, the running capacitor 28 is switched to the small-capacity running capacitor 28 (step P7), and then the routine shifts to the normal control routine P8.

The operation in such control is shown in FIG.
This will be described with reference to FIG. Conditions for transporting and installing the refrigerator in summer, that is, when the outdoor temperature is high and not cooled (P ≧ Pma
In x), when the power is turned on, the compressor 4
The pressure on the discharge side rapidly rises with the passage of time, and the load applied to the compressor 4 increases in proportion thereto.

Thereafter, when ΔT1 has elapsed (discharge-side pressure Pd1)
If the detection input value P of the high-pressure detection means 36 is equal to or more than the upper limit set value Pmax, the circuit of the PSC fan motor 26 for driving the machine room fan 25 for cooling the machine room radiator 24 for the time of ΔT2 is used. When switching from the small-capacity running condenser 28 to the large-capacity running condenser 29, the rotation speed of the PSC fan motor 26 is increased, the heat radiation performance of the machine room radiator 24 is improved, and the rise of the discharge side pressure Pd of the compressor 4 is also moderate. Therefore, the load on the compressor is reduced.

After a lapse of ΔT2, the running condenser 29 is switched from the large-capacity running condenser 29 to the small-capacity running condenser 28.
Since the temperature of the cooler 6 has also been lowered, d has a relatively low value and rises with a gentle curve when the power is turned on, and after reaching the maximum value Pdmax, stabilizes. Is also suppressed.

Also, without stopping the blower fan 7, the cooling performance is improved because the heat radiation performance of the machine room heat radiator 24 is improved, and the time required to reach a predetermined temperature is shortened. Will not give.

[Brief description of the drawings]

FIG. 1 is a front view of a machine room of a refrigerator according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic electric configuration of the refrigerator according to the first embodiment of the present invention.

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

FIG. 4 is a change characteristic diagram of a discharge side pressure of a compressor in the refrigerator of the present invention.

FIG. 5 is a block diagram showing a schematic electric configuration of a refrigerator according to a second embodiment of the present invention.

FIG. 6 is a flowchart of control of a refrigerator according to a second embodiment of the present invention.

FIG. 7 is a block diagram showing a schematic electric configuration of a refrigerator according to a third embodiment of the present invention.

FIG. 8 is a flowchart of control of a refrigerator according to a third embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a conventional refrigerator.

FIG. 10 is a block diagram showing a schematic electric configuration of a conventional refrigerator.

FIG. 11 is a flowchart of control of a conventional refrigerator.

FIG. 12 is a change characteristic diagram of a discharge side pressure of a compressor in a conventional refrigerator.

[Explanation of symbols]

 2 Freezer room 3 Refrigerator room 4 Compressor 6 Cooler 23 Machine room 24 Machine room radiator 25 Machine room fan 26 PSC fan motor 27 Condenser temperature sensor 28 Small capacity running condenser 29 Large capacity running condenser 32 Defrosting end detection sensor 34 power input detecting means 36 high pressure detecting means

Claims (3)

[Claims] A refrigerator, a refrigerator, a compressor,
Condenser, refrigeration cycle equipped with a cooler, a machine room containing a machine room radiator that is part of the compressor and the condenser, and a machine room fan that cools the machine room radiator,
A PSC fan motor for driving the machine room fan, a small-capacity running condenser provided in the circuit of the PSC fan motor, a large-capacity running condenser, and a defrost end detection sensor installed in the cooler; A condenser temperature sensor for detecting a temperature of the condenser;
Means for controlling the driving of the SC fan motor, means for switching between the small-capacity running condenser and the large-capacity running condenser, wherein the temperature of the defrost end detection sensor is equal to or higher than a set temperature immediately after power-on. When the condenser temperature sensor temperature is detected to be equal to or higher than the upper limit set temperature after a predetermined time has elapsed after turning on the power, switching from the small-capacity running condenser to the large-capacity running condenser for a preset time is performed. A refrigerator characterized by the following. 2. A power supply input detecting means, comprising means for detecting a power input of a refrigerator, and when a predetermined time has elapsed after the power is turned on when the temperature of the defrosting end detecting sensor detects a temperature equal to or higher than a set temperature immediately after the power is turned on. 2. The refrigerator according to claim 1, wherein, when the detected value is equal to or more than the upper limit set value, the small capacity running capacitor is switched to the large capacity running capacitor for a preset time. 3. A high-pressure pressure detecting means for detecting a high-pressure pressure of the refrigerator. 2. The refrigerator according to claim 1, wherein, when the detected value is equal to or more than the upper limit set value, the small capacity running capacitor is switched to the large capacity running capacitor for a preset time.