JPH1062049A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reduce the load of a compressor without halting halting the operation of a fan by changing over the rotary speed of a DC fan motor only for a predetermined time when it is detected that the temperature of a temperature sensor of a condenser exceeds the upper limit setting value after power is switched on. SOLUTION: When power is switched on, a control circuit 28 allows a compressor 4, a fan 7 and a DC fan motor 26 to start operation in normal mode and determines whether or not the detected temperatures of a room temperature sensor 14 and a refrigerating chamber temperature sensor 9 exceed a predetermined value. When both detected temperatures exceed the setting values, it is determined whether or not the detected value of the temperature sensor 27 of the condenser exceeds the upper limit value. In the case when it is over the upper limit value, an input load to a compressor 4 is increased so that the DC fan motor 26 may be switched over to higher rotary speed. Then, the DC fan motor 26 is switched over to normal mode after a predetermined time has elapsed.

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.
Temperature control device 1 with built-in 0 and refrigerator temperature sensor 11
2, the damper device 10 and the cooling chamber 5 are connected by a duct 13.

A room temperature sensor 14 is provided at a lower portion of the front surface of the freezer compartment door 2a. In FIG. 10, a freezer compartment temperature sensor 9 generates a temperature detection signal corresponding to the temperature of the freezer compartment 2, and a refrigerator compartment temperature sensor 11 generates a temperature detection signal according to the temperature of the refrigerator compartment 3. Reference numeral 14 denotes a configuration for generating a temperature detection signal corresponding to the installation atmosphere temperature DS of the refrigerator main body 1, and each of these temperature detection signals is 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 S3).

When the detected temperature DS is lower than the upper limit temperature Dmax, the normal control routine S7 is directly executed. When the detected temperature DS 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 rises rapidly 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)
The detected temperature DS of the room temperature 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 exhibiting the maximum Pdmax, the value is settled to a value corresponding to the temperature of the cooler 6, and an increase in the input load to the compressor 4 is suppressed.

[0017]

However, in the above configuration, when the outside air temperature is high (that is, when DS ≧ 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 cooling time to a predetermined temperature is prolonged, which has a problem of adversely affecting the preserved food. .

The present invention has been made in view of the above problems, and is intended 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. A room fan, a DC fan motor that drives a machine room fan, a unit that controls driving of the DC fan motor, and a unit that switches the rotation speed of the DC fan motor,
A room temperature sensor for detecting the installation atmosphere temperature, a condenser temperature sensor for detecting the temperature of the condenser, and a freezing room temperature sensor for detecting the freezing room temperature. When the temperature is detected to be equal to or higher than the set temperature, a predetermined time after the power is turned on, and when the condenser temperature sensor temperature is detected to be equal to or higher than the upper limit set temperature, the rotation speed of the DC fan motor is switched for a preset time. It was done.

A machine room accommodating a machine room radiator which is a part of the compressor and the condenser, a machine room fan for cooling the machine room radiator, a DC fan motor for driving the machine room fan, and a DC fan Means for controlling the driving of the motor, means for switching the number of rotations of the DC fan motor, a room temperature sensor for detecting the installation atmosphere temperature, a condenser temperature sensor for detecting the temperature of the condenser, and a refrigerator for detecting the temperature of the refrigerator compartment A temperature sensor is provided.When the temperature of the refrigerator compartment temperature sensor and the temperature of the room temperature sensor are detected to be equal to or higher than the set temperature immediately after the power is turned on, after a predetermined time has elapsed after the power is turned on, the temperature of the condenser temperature sensor is detected to be equal to or higher than the upper limit set temperature. In such a case, the rotation speed of the DC fan motor is switched for a preset time.

A machine room accommodating a machine room radiator which is a part of the compressor and the condenser, a machine room fan for cooling the machine room radiator, a DC fan motor for driving the machine room fan, and a DC fan Means for controlling the driving of the motor, means for switching the number of rotations of the DC fan motor, a room temperature sensor for detecting the installation atmosphere temperature, means for detecting the power input value of the refrigerator body, and a freezing room for detecting the freezing room temperature A temperature sensor, and when the temperature of the freezer compartment temperature sensor and the temperature of the room temperature sensor are detected to be equal to or higher than a set temperature immediately after turning on the power, the number of rotations of the DC fan motor is switched for a preset time. .

A machine room accommodating a machine room radiator which is a part of the compressor and the condenser; a machine room fan for cooling the machine room radiator; a DC fan motor for driving the machine room fan; Means for controlling the driving of the motor, means for switching the number of rotations of the DC fan motor, a room temperature sensor for detecting the installation atmosphere temperature, means for detecting the power input value of the refrigerator body, and a refrigerator for detecting the temperature of the freezer compartment A temperature sensor, and when the temperature of the freezer compartment temperature sensor and the temperature of the room temperature sensor detect the temperature equal to or higher than the set temperature immediately after the power is turned on, after a predetermined time elapses after the power is turned on, the power input detection means detects the upper limit set value or more. In such a case, the rotation speed of the DC fan motor is switched for a preset time.

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

[0024]

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, and a machine room fan for cooling the machine room radiator. A DC fan motor to drive the machine room fan,
A means for controlling the drive of the DC fan motor, a means for switching the number of rotations of the DC fan motor, a room temperature sensor for detecting the installation atmosphere temperature, a condenser temperature sensor for detecting the condenser temperature, and a freezer compartment temperature detection When the temperature of the room temperature sensor and the temperature of the freezer temperature sensor are detected to be equal to or higher than the set temperature immediately after the power is turned on, the condenser temperature sensor temperature is equal to or higher than the upper limit set temperature after a predetermined time has elapsed after the power is turned on. When the DC fan motor is detected, the rotation speed of the DC fan motor increases for a preset time, the heat radiation performance of the machine room radiator improves, and the pressure on the discharge side of the compressor also moderates, reducing the load on the compressor. Is done. In addition, since the heat radiation performance of the machine room radiator is improved without stopping the blower fan, the cooling performance is improved, the time required to reach a predetermined temperature is shortened, and the stored food is not adversely affected.

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. DC fan motor, means for controlling the drive of the DC fan motor, means for switching the number of rotations of the DC fan motor, a room temperature sensor for detecting the installation atmosphere temperature, and a condenser temperature for detecting the condenser temperature A condenser and a refrigerator compartment temperature sensor for detecting a refrigerator compartment temperature. When the temperature of the room temperature sensor and the refrigerator compartment temperature sensor detects a temperature equal to or higher than a set temperature immediately after the power is turned on, and after a lapse of a predetermined time after the power is turned on, the condenser If the temperature sensor temperature is detected to be equal to or higher than the upper limit set temperature, the rotation speed of the DC fan motor will increase for a preset time, and the heat dissipation performance of the machine room radiator will improve. Elevated presser discharge pressure also load on the compressor for a gradual also reduced.
In addition, since the heat radiation performance of the machine room radiator is improved without stopping the blower fan, the cooling performance is improved, the time required to reach a predetermined temperature is shortened, and the stored food is not adversely affected.

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 DC fan motor that drives the DC fan motor, a unit that controls the drive of the DC fan motor, a unit that switches the number of rotations of the DC fan motor, a room temperature sensor that detects an installation atmosphere temperature, and a unit that detects a power input of a refrigerator, A freezer compartment temperature sensor for detecting a freezer compartment temperature, when the temperature of the room temperature sensor and the temperature of the freezer compartment temperature sensor are detected to be equal to or higher than a set temperature immediately after the power is turned on, and after a predetermined time elapses after the power is turned on, the power input detecting means is provided. If the detected value is equal to or higher than the upper limit value, the rotation speed of the DC fan motor increases for a preset time, the heat radiation performance of the machine room radiator improves, and the compressor discharge side Load on the compressor for increasing the force also becomes gentle is also reduced. Further, since the power input is detected, the load on the compressor can be detected with high accuracy without variation in mounting and workability as in the case of detecting means using a sensor or the like.

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 stored food is adversely affected. Is gone.

According to a fourth 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 DC fan motor that drives the DC fan motor, a unit that controls the drive of the DC fan motor, a unit that switches the number of rotations of the DC fan motor, a room temperature sensor that detects an installation atmosphere temperature, and a unit that detects a power input of a refrigerator, A refrigerator compartment temperature sensor for detecting a refrigerator compartment temperature, when the temperature of the room temperature sensor and the refrigerator compartment temperature sensor detects the temperature equal to or higher than the set temperature immediately after the power is turned on, and after a predetermined time has elapsed after the power is turned on, the power input detection means is provided. If the detected value is equal to or more than the upper limit set value, the discharge side pressure of the DC fan motor rises slowly for a preset time, so that the load on the compressor is reduced. Further, since the power input is detected, the load on the compressor can be detected with high accuracy without variation in mounting and workability as in the case of detecting means using a sensor or the like.

In addition, 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 stored food is adversely affected. Is gone.

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 DC 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.

Referring to FIG. 2, the control circuit 28 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.

Reference numeral 31 denotes a DC power supply for driving the DC fan motor 26, which is supplied with power from the plug 17. Control circuit 28
Is a freezer compartment temperature sensor 9, a refrigerator compartment temperature sensor 11,
Upon receiving the input signals generated from the room temperature sensor 14, the defrost timer 16, and the condenser temperature sensor 27, based on a control program stored in advance, the compressor 4, the blower fan 7, the damper device 10, and the defrost heater 8
Further, the power supply to the DC fan motor 26 is controlled via relays 19 to 22 and the relay 29 to control the power supply to the DC fan motor 26.

The rotation speed of the DC fan motor 26 is set by the control circuit 28. FIG. 4 is a change characteristic diagram of the discharge pressure 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 28.
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 DC fan motor 26 start operating at normal rotation (step P1).

Immediately thereafter, the detected temperature D of the room temperature sensor 14 is determined.
It is determined whether both A and the temperature DF detected by the freezer compartment temperature sensor 9 are equal to or higher than a set value Dmax (for example, 35 ° C.) (step P2).

If the detected temperatures DA and DF are both lower than the set value Dmax, the normal routine P8 is executed as it is. If both the detected temperatures DA and DF are higher than the set value Dmax, When it is detected that the temperature is at the time of the temperature and the temperature is not cooled, the process waits until a predetermined time ΔT1 elapses in this state (step P3).

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
However, if the detected temperature DC is equal to or higher than the upper limit temperature DCmax, that is, if the input load to the compressor 4 is increasing, the DC fan motor 26 is switched to high rotation (step P5) and preset. Time spent T
It waits until two passes (step P6).

Thereafter, after the elapse of ΔT2, the DC fan motor 26 is switched to the normal rotation (step P7), and thereafter, the process proceeds to the normal control routine P8. The normal routine P8 is very general, and the freezing room temperature sensor 9
The operation of the compressor 4, the blower fan 7, and the DC fan motor 26 is controlled based on the temperature detection signal from the CPU, the opening and closing control of the damper device 10 is controlled based on the temperature detection signal from the refrigerator compartment temperature sensor 11, and the defrost timer 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. Conditions for transporting and installing the refrigerator in summer, that is, when the outdoor temperature is high and not cooled (DA ≧ Dma
(x and DF ≧ Dmax), when the power is turned on, the discharge side pressure of the compressor 4 rises rapidly with the passage of time, and the load applied to the compressor 4 also increases in proportion thereto.

Thereafter, when ΔT1 has elapsed (discharge-side pressure Pd1)
Meanwhile, when the detected temperature DC of the condenser temperature sensor 24 is equal to or higher than the upper limit temperature DCmax, the DC fan motor 26 for driving the machine room fan 25 for cooling the machine room radiator 24 is rotated at a high speed for the time of ΔT2. The heat radiation performance of the machine room radiator 24 is improved, and the discharge-side pressure Pd of the compressor 4 rises gradually, so that the load on the compressor is reduced.

After ΔT2 has elapsed, when the DC fan motor 26 is returned to the normal rotation, the power is turned on while the discharge side pressure Pd of the compressor 4 exhibits a relatively low value because the temperature of the cooler 6 has also decreased. It rises in a gentler curve than at a time, stabilizes after showing the maximum value Pdmax, and the rise of the input load to the compressor 4 is also suppressed.

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 not be given.

(Embodiment 2) A second embodiment of the present invention will be described with reference to FIGS. In addition, the first of the present invention
Components having the same configurations as those of the first embodiment 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 the first embodiment of the present invention. 25 is a machine room fan that cools the machine room radiator 24, 26 is a DC 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 second embodiment of the present invention, and FIG. 5 is a flowchart of control of the refrigerator according to the second embodiment of the present invention.

In FIG. 2, the control circuit 28 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.

Reference numeral 31 denotes a power supply for driving the DC fan motor 26, which is supplied with power from the plug 17. The control circuit 28
The compressor 4, the blower fan and the input signal generated from the freezer compartment temperature sensor 9, the refrigerator compartment temperature sensor 11, the room temperature sensor 14, the defrost timer 16 and the condenser temperature sensor 27 are stored based on a control program stored in advance. 7, to the damper device 10 and the defrost heater 8,
The control of the energization of the DC fan motor 26 is performed via a relay 29.

The rotation speed of the DC fan motor 26 is set by the control circuit 28. FIG. 4 is a change characteristic diagram of the discharge pressure of the compressor in the refrigerator of the present invention. The control of the refrigerator configured as described above will be described below.

FIG. 5 shows the control by the control circuit 28.
Only the parts relevant to the gist of the present invention are shown, and this will be described below. When the power is turned on, the compressor 4, the blower fan 7, and the DC fan motor 26 start operating at normal rotation (step P1). Immediately thereafter, it is determined whether or not both the detected temperature DA of the room temperature sensor 14 and the detected temperature DP of the refrigerator compartment temperature sensor 9 are equal to or higher than a set value Dmax (for example, 35 ° C.) (step P2).

When the detected temperatures DA and DP are both lower than the set value Dmax, the normal routine P8 is executed as it is, but when both the detected temperatures DA and DP are higher than the set value Dmax, When it is detected that the temperature is at the time of the temperature and the temperature is not cooled, the process waits until a predetermined time ΔT1 elapses in this state (step P3).

When the time ΔT1 has elapsed, it is determined whether 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
However, if the detected temperature DC is equal to or higher than the upper limit temperature DCmax, that is, if the input load to the compressor 4 is increasing, the DC fan motor 26 is switched to high rotation (step P5) and preset. Time spent T
It waits until two passes (step P6).

Thereafter, after ΔT2 has elapsed, the DC fan motor 26 is switched to the normal rotation (step P7), and thereafter, the process proceeds 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 DC fan motor 26 based on the temperature detection signal from the freezing room temperature sensor 9 to determine 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.
The operation in such control will be described with reference to FIG.

The condition for transporting and installing the refrigerator in summer, that is, when the refrigerator is at a high outside air temperature and is not cooled (DA ≧ Dmax and DP ≧
In Dmax), 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 also increases in proportion thereto.

Thereafter, after the lapse of ΔT1 (discharge-side pressure Pd1)
Meanwhile, when the detected temperature DC of the condenser temperature sensor 24 is equal to or higher than the upper limit temperature DCmax, the DC fan motor 26 for driving the machine room fan 25 for cooling the machine room radiator 24 is rotated at a high speed for the time of ΔT2. The heat radiation performance of the machine room radiator 24 is improved, and the discharge-side pressure Pd of the compressor 4 rises gradually, so that the load on the compressor is reduced.

After ΔT2 has elapsed, when the DC fan motor 26 is returned to the normal rotation, the power is turned on while the discharge side pressure Pd of the compressor 4 exhibits a relatively low value because the temperature of the cooler 6 has also been lowered. It rises in a gentler curve than at a time, stabilizes after showing the maximum value Pdmax, and the rise of 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 be given.

(Embodiment 3) A third embodiment of the present invention will be described with reference to FIGS. In addition, the first of the present invention
Components having the same configurations as those of the first embodiment 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 for cooling the machine room radiator 24, and reference numeral 26 denotes a DC fan motor for driving the machine room fan 25. FIG. 6 is a block diagram showing a schematic electric configuration of a refrigerator according to the third embodiment of the present invention, and FIG. 7 is a flowchart of control of the refrigerator according to the third embodiment of the present invention.

In FIG. 6, reference numeral 30 denotes a power input detection means, which generates a signal corresponding to a power input value. The control circuit 28 includes 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.

Reference numeral 31 denotes a power supply for driving the DC fan motor 26, which is supplied with power from the plug 17. The control circuit 28
Freezer compartment temperature sensor 9, refrigerator compartment temperature sensor 11, room temperature sensor 14, defrost timer 16, power input detection means 3
0, based on a control program stored in advance and controlling the compressor 4, the blower fan 7, the damper device 10, and the defrost heater 8 and controlling the energization of the DC fan motor 26 through a relay 29. Is configured to run through

The number of revolutions of the DC fan motor 26 is set by the control circuit 28. FIG. 4 is a graph showing a pressure change characteristic 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. 7 shows a control circuit 28.
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 DC fan motor 26 start operating at normal rotation (step P1).

Immediately thereafter, the detected temperature D of the room temperature sensor 14
It is determined whether both A and the temperature DF detected by the freezer compartment temperature sensor 9 are equal to or higher than a set value Dmax (for example, 35 ° C.) (step P2).

If the detected temperatures DA and DF are both lower than the set value Dmax, the normal routine P8 is executed as it is. If both the detected temperatures DA and DF are higher than the set value Dmax, When it is detected that the temperature is at the time of the temperature and the temperature is not cooled, the process waits until a predetermined time ΔT1 elapses in this state (step P3).

When the time ΔT1 has elapsed, the detected input value W of the power input detecting means 27 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
Is executed, but the detection input value W is equal to the upper limit set value Wmax.
If this is the case, that is, if the input load to the compressor 4 is increasing, the DC fan motor 26 is switched to high rotation (step P5), and waits until the preset time ΔT2 has elapsed (step P6). ).

Thereafter, after the elapse of ΔT2, the DC fan motor 26 is switched to the normal rotation (step P7), and thereafter, the process proceeds 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 DC fan motor 26 based on the temperature detection signal from the freezing room temperature sensor 9 to determine the temperature of the refrigerator compartment. Sensor 1
The opening and closing control of the damper device 10 is performed based on the temperature detection signal from the control unit 1, and the normal control of the defrost heater 8 is performed based on the defrost signal from the defrost timer 16.
The operation in such control will be described with reference to FIG.

The condition in which the refrigerator is transported and installed in the summer, that is, when the refrigerator is at a high outside air temperature and is not cooled (DA ≧ Dmax and DP ≧
Dmax), 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 in proportion thereto increases.

Thereafter, when ΔT1 has elapsed (discharge-side pressure Pd1)
Meanwhile, when the detected temperature DC of the condenser temperature sensor 27 is equal to or higher than the upper limit temperature DCmax, the DC fan motor 26 for driving the machine room fan 25 for cooling the machine room radiator 24 is rotated at a high speed for the time of ΔT2. The heat radiation performance of the machine room radiator 24 is improved, and the discharge-side pressure Pd of the compressor 4 rises gradually, so that the load on the compressor is reduced. After ΔT2 has elapsed, the DC fan motor 2
When the compressor 6 is returned to the normal rotation, the discharge-side pressure Pd of the compressor 4 rises along a gentler curve than when the power is turned on while exhibiting a relatively low value because the temperature of the cooler 6 is also reduced. After showing the value Pdmax, it becomes stable, and the rise of the input load to the compressor 4 is suppressed. Further, since the power input is detected, the load on the compressor can be detected with high accuracy without variation in mounting and workability as in the case of detecting means using a sensor or the like.

In addition, the cooling performance is improved because the heat radiation performance of the machine room heat radiator 24 is improved without exhibiting the blower fan 7, the time required to reach a predetermined temperature is shortened, and the stored food is adversely affected. Will not be given.

(Embodiment 4) A fourth embodiment of the present invention will be described with reference to FIGS. In addition, the first of the present invention
Components having the same configurations as those of the first embodiment 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 fourth embodiment of the present invention. Reference numeral 25 denotes a machine room fan for cooling the machine room radiator 24, and reference numeral 26 denotes a DC fan motor for driving the machine room fan 25. FIG. 6 is a block diagram showing a schematic electric configuration of a refrigerator according to the fourth embodiment of the present invention, and FIG. 8 is a flowchart of control of the refrigerator according to the fourth embodiment of the present invention.

In FIG. 6, reference numeral 30 denotes a power input detection means, which generates a signal corresponding to the power input value. The control circuit 28 includes 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.

Reference numeral 31 denotes a power supply for driving the DC fan motor 26, which is supplied with power from the plug 17. The control circuit 28
Freezer compartment temperature sensor 9, refrigerator compartment temperature sensor 11, room temperature sensor 14, defrost timer 16, power input detection means 3
0, based on a control program stored in advance and controlling the compressor 4, the blower fan 7, the damper device 10, and the defrost heater 8 and controlling the energization of the DC fan motor 26 through a relay 29. Is configured to run through

The rotation speed of the DC fan motor 26 is set by the control circuit 28. FIG. 4 is a change characteristic diagram of the discharge pressure of the compressor in the refrigerator of the present invention.

The refrigerator configured as described above
Hereinafter, the control will be described. FIG. 8 shows a control circuit 28.
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 DC fan motor 26 start operating at normal rotation (step P1).

Immediately thereafter, the detected temperature D of the room temperature sensor 14
It is determined whether both A and the temperature DP detected by the refrigerator temperature sensor 9 are equal to or higher than a set value Dmax (for example, 35 ° C.) (step P2).

If both the detected temperatures DA and DP are lower than the set value Dmax, the normal routine P8 is executed as it is. If both the detected temperatures DA and DP are higher than the set value Dmax, When it is detected that the temperature is at the time of the temperature and the temperature is not cooled, the process waits until a predetermined time ΔT1 elapses in this state (step P3).

When the time ΔT1 has elapsed, the detected input value W of the power input detecting means 30 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 DC fan motor 26 is switched to high rotation (step P5), Preset time ΔT
It waits until two passes (step P6).

Then, after the elapse of ΔT2, the DC fan motor 26 is switched to the normal rotation (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 DC fan motor 26 based on the temperature detection signal from the freezing room temperature sensor 9 to control 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.
The operation in such control will be described with reference to FIG.

The condition in which the refrigerator is transported and installed in summer, that is, when the refrigerator is at a high outside air temperature and is not cooled (DA ≧ Dmax and DP ≧
In Dmax), 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 also increases in proportion thereto.

Thereafter, when ΔT1 has elapsed (discharge side pressure Pd1)
If the detected input value W of the power input detecting means 27 is equal to or larger than the upper limit set value Wmax, the DC fan motor 26 for driving the machine room fan 25 for cooling the machine room radiator 24 is set at a high level for ΔT2. As a result, the heat radiation performance of the machine room heat radiator 24 is improved, and the discharge side pressure Pd of the compressor 4 rises slowly, so that the load on the compressor is reduced.

After the elapse of ΔT2, when the DC fan motor 26 is returned to the normal rotation, the power is turned on while the discharge side pressure Pd of the compressor 4 shows a relatively low value because the temperature of the cooler 6 is also lowered. It rises in a gentler curve than at a time, stabilizes after showing the maximum value Pdmax, and the rise of the input load to the compressor 4 is also suppressed.

Further, since the power input is detected, the load of the compressor is accurately detected without any variation in mounting and workability as in a detecting means such as a sensor.

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, the time required to reach a predetermined temperature is shortened, and the stored food is adversely affected. Will not be given.

[0095]

As described above, according to the present invention, 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 DC fan motor, means for controlling the drive of the DC fan motor, means for switching the number of rotations of the DC fan motor, a room temperature sensor for detecting the installation atmosphere temperature, and a condenser temperature for detecting the condenser temperature It consists of a sensor and a freezer temperature sensor that detects the freezer temperature.When the temperature of the room temperature sensor and the freezer temperature sensor exceeds the set temperature immediately after turning on the power, the refrigerator is installed and the freezer is cooled sufficiently. If the condenser temperature sensor temperature is detected to be higher than the upper limit set temperature after a predetermined time elapses after turning on the power, the DC fan is set for a preset time. Rotation speed of over motor is up to improve heat radiation performance of the machine room radiator, increasing the discharge pressure of the compressor is also load on the compressor for a gradual also reduced. In addition, since the heat radiation performance of the machine room radiator is improved without stopping the blower fan, the cooling performance is improved, the time required to reach a predetermined temperature is shortened, and the stored food is not adversely affected. The effect is obtained.

Also, a machine room accommodating a machine room radiator which is a part of the compressor and the condenser, a machine room fan for cooling the machine room radiator, a DC fan motor for driving the machine room fan, and a DC fan Means for controlling the driving of the motor, means for switching the number of rotations of the DC fan motor, a room temperature sensor for detecting the installation atmosphere temperature, a condenser temperature sensor for detecting the temperature of the condenser, and a refrigerator for detecting the temperature of the refrigerator compartment. It consists of a room temperature sensor, and when the temperature of the room temperature sensor and the refrigerator room temperature sensor detects the set temperature or more immediately after turning on the power, that is, when the refrigerator is installed and the refrigerator is not sufficiently cooled, If the condenser temperature sensor temperature is detected to be equal to or higher than the upper limit set temperature after the lapse of a predetermined time, the rotation speed of the DC fan motor increases for a preset time. Heat dissipation performance is improved in 械室 radiator,
Since the pressure on the discharge side of the compressor also rises slowly, the load on the compressor is reduced. 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, the arrival time to the predetermined temperature is shortened, and the stored food is not adversely affected. The effect is obtained.

Further, a machine room containing a machine room radiator which is a part of the compressor and the condenser, a machine room fan for cooling the machine room radiator, a DC fan motor for driving the machine room fan, and a DC fan Means for controlling the drive of the motor, means for switching the number of revolutions of the DC fan motor, a room temperature sensor for detecting the installation atmosphere temperature, means for detecting the power input of the refrigerator, and a freezer temperature sensor for detecting the freezer temperature. When the temperature of the room temperature sensor and the temperature of the freezer compartment temperature sensor are detected to be equal to or higher than the set temperature immediately after the power is turned on, that is, when the refrigerator is installed and the freezer compartment is not sufficiently cooled, the temperature of the condenser temperature sensor is reduced. If the power input detection means detects a value equal to or higher than the upper limit set value after a predetermined time has elapsed after turning on the power, the rotation speed of the DC fan motor is increased for a preset time. And improved heat radiation performance of the machine room radiator, increasing the discharge pressure of the compressor is also load on the compressor for a gradual also reduced. Further, since the power input is detected, the load on the compressor can be detected with high accuracy without variation in mounting and workability as in the case of detecting means using a sensor or the like.

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 stored food is adversely affected. Is obtained.

A machine room accommodating a machine room radiator which is a part of the compressor and the condenser, a machine room fan for cooling the machine room radiator, a DC fan motor for driving the machine room fan, and a DC fan Means for controlling the driving of the motor, means for switching the number of revolutions of the DC fan motor, a room temperature sensor for detecting the installation atmosphere temperature, means for detecting the power input of the refrigerator, and a refrigerator temperature sensor for detecting the refrigerator temperature. Assuming that the temperature of the room temperature sensor and the temperature of the refrigerator compartment temperature sensor are higher than the set temperature immediately after turning on the power, that is, when the refrigerator is installed and the freezer compartment is not sufficiently cooled, the temperature of the condenser temperature sensor is reduced. If the power input detection means detects a value equal to or higher than the upper limit set value after a predetermined time has elapsed after the power is turned on, the discharge side pressure of the DC fan also increases for a preset time. The load on the compressor to become a burned is also reduced. Also, to detect power input,
It is possible to accurately detect the load on the compressor without variation in mounting and workability as in the case of detecting means using a sensor or the like.

In addition, 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 stored food is adversely affected. Is obtained.

[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 flowchart of control of a refrigerator according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a schematic electric configuration of a refrigerator according to a third embodiment of the present invention.

FIG. 7 is a flowchart of control 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 fourth 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 14 Room temperature sensor 23 Machine room 24 Machine room radiator 25 Machine room fan 26 DC fan motor 27 Condenser temperature sensor 30 Power input detection means

Claims (4)

[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 DC fan motor for driving the machine room fan, a unit for controlling the driving of the DC fan motor, a unit for switching the number of rotations of the DC fan motor, a room temperature sensor for detecting an installation atmosphere temperature, and a condenser for the condenser. A condenser temperature sensor for detecting a temperature, and a freezing room temperature sensor for detecting the freezing room temperature, wherein the temperature of the freezing room temperature sensor and the temperature of the room temperature sensor are equal to or higher than a set temperature after a lapse of a predetermined time immediately after power-on. When the condenser temperature sensor temperature is detected to be equal to or higher than an upper limit set temperature after a predetermined time has elapsed after turning on the power, the rotation speed of the DC fan motor is increased by a preset time. . 2. A freezing room, a refrigerator room, 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 DC fan motor for driving the machine room fan, a unit for controlling the driving of the DC fan motor, a unit for switching the number of rotations of the DC fan motor, a room temperature sensor for detecting an installation atmosphere temperature, and a condenser for the condenser. A condenser temperature sensor for detecting a temperature, and a refrigerator temperature sensor for detecting the refrigerator temperature, wherein the temperature of the refrigerator temperature sensor and the temperature of the room temperature sensor are equal to or higher than a set temperature after a lapse of a predetermined time immediately after power-on. When the condenser temperature sensor temperature is detected to be equal to or higher than an upper limit set temperature after a predetermined time has elapsed after turning on the power, the rotation speed of the DC fan motor is increased by a preset time. . And a means for detecting a power input to the refrigerator, wherein when the temperatures of the freezer compartment temperature sensor and the room temperature sensor detect a temperature equal to or higher than a set temperature immediately after the power is turned on, the power supply is turned on after a lapse of a predetermined time after the power is turned on. When the input detecting means detects a value equal to or higher than the upper limit set value, the rotation speed of the DC fan motor is increased by a preset time. 4. A means for detecting a power input of a refrigerator, wherein when a temperature of the refrigerator temperature sensor and the temperature of the room temperature sensor are equal to or higher than a set temperature immediately after the power is turned on, the power source is turned on after a lapse of a predetermined time after the power is turned on. When the input detecting means detects a value equal to or higher than the upper limit set value, the rotation speed of the DC fan motor is increased by a preset time.