JPH08247604A - Refrigerator - Google Patents

Abstract

PURPOSE: To improve reliability of operation of a compressor when a power supply is turned on, and reduce time required for the temperature in a refrigerator to return to a predetermined temperature upon power interruption. CONSTITUTION: When the temperature DA of a condenser temperature sensor 23 and the temperature DF of a freezing chamber temperature sensor 9 are both set at a temperature Dmax or higher when power supply to a compressor 4 and an air fan 7 is started just after a power supply is turned on, when the temperature DC of the condenser temperature sensor 23 after the lapse of a predetermined time ΔT1 is an upper limit set value DCmax or higher, the air fan 7 is kept at a power interruption state thereafter only for a predetermined time ▵T2, after the power interruption state normal control is executed.

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 an indirect cooling type 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, JP-A-5-240554 is known.

An example of a conventional refrigerator will be described below with reference to FIGS. 9, 10, 11 and 12.

FIG. 9 is a vertical sectional view of a conventional refrigerator, FIG. 10 is a block diagram showing a schematic electric configuration of the refrigerator, FIG. 11 is a control flowchart of the refrigerator, and FIG. 12 is a discharge side pressure of a compressor in the refrigerator. It is a change characteristic view.

In FIG. 9, a refrigerator main body 1 has a structure including a freezing compartment 2 and a refrigerating compartment 3, and doors (reference numerals 2a and 3a for doors for the freezing compartment 2 and the refrigerating compartment 3, respectively) are provided in the respective compartments. Is attached), and the compressor 4 is arranged at the lower part of the back surface thereof.

A cooling chamber 5 is formed in the rear portion of the freezing chamber 2, and a cooler 6, a blower fan 7 and a defrosting heater 8 are installed in the cooling chamber 5, and a part of the cooling chamber 2 is provided. A freezer compartment temperature sensor 9 is attached to the.

A damper device 1 is provided on the rear surface of the refrigerator compartment 3.
0 and temperature controller 11 with built-in cold room temperature sensor 11
2 is installed, and the damper device 10 and the cooling chamber 5 are connected by a duct 13.

A room temperature sensor 14 is installed below the front surface of the freezer compartment door 2a. In FIG. 10, the freezer compartment temperature sensor 9 generates a temperature detection signal according to the temperature of the freezer compartment 2, the refrigeration compartment temperature sensor 11 generates a temperature detection signal according to the temperature of the refrigeration compartment 3, and the room temperature sensor 14 The refrigerator main body 1 is configured to generate a temperature detection signal according to the installation ambient temperature DS, and these temperature detection signals are given to the control circuit 15.

The defrost timer 16 generates a defrost signal for each predetermined defrost cycle, and the defrost signal is given 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 source via a DC power source circuit 18.

The control circuit 15 relays on / off control to the compressor 4, the blower fan 7, the damper device 10 and the defrost heater 8 on the basis of the above-mentioned input signals and the previously stored control program. It is configured to run via 19-22.

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

When the power is turned on, the compressor 4 and the blower fan 7 start operating (step S1), and in this state, the system waits 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 executed as it is, but when the detected temperature DS is higher than the upper limit temperature Dmax, that is, the input load to the compressor 4 is increased. Under the increasing condition, the blower fan 7 is stopped (step S4), and stands by until a preset time ΔT2 elapses (step S5). After the lapse of ΔT2, the power supply to the blower fan 7 is restarted (step S6), and then the process proceeds to the normal control routine S7.

The normal routine S7 is a very general one, and the operation of the compressor 4 and the blower fan 7 is controlled based on the temperature detection signal from the freezer compartment temperature sensor 9, and the temperature from the refrigerating compartment temperature sensor 11 is controlled. The opening / closing control of the damper device 10 is performed based on the 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 is shown in FIG.
This will be described with reference to 2. When the refrigerator is transported in the summer and the power is turned on, the pressure on the discharge side of the compressor 4 sharply increases with time, and the load applied to the compressor 4 also increases in proportion to it. After that, when ΔT1 has elapsed (discharge side pressure Pd1), if the temperature DS detected by the room temperature sensor 14 is equal to or higher than the upper limit temperature Dmax, the blower fan 7 is stopped for a period of ΔT2.
The amount of heat exchange between the air and the inside air decreases, the discharge side pressure Pd of the compressor 4 also decreases, and naturally the input load to the compressor 4 also decreases.

However, during this period, the operation of the compressor 4 is continued, so that the refrigerant continues to circulate in the cooling system and the temperature of the cooler 6 is lowered. After that, when the operation of the blower fan 7 is restarted after a lapse of ΔT2, the discharge side pressure Pd of the compressor 4 has a relatively low value because the temperature of the cooler 6 has sufficiently decreased, and therefore the discharge side pressure Pd is lower than that when the power is turned on. The temperature rises in a gentle curve, reaches the maximum value Pdmax, and then stabilizes at a value according 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-mentioned structure, when the outside temperature is high (that is, when DS ≧ Dmax),
Even when a power failure occurs and the power is restored in a short time while the freezer compartment and the refrigerator compartment are sufficiently cooled, it is the same as when the power is turned on.
After the lapse of T1, the blower fan is stopped during ΔT2, so that the freezing room and the refrigerating room have a long time to return to a predetermined temperature, which causes a problem that stored foods are adversely affected.

The present invention has been made to solve the above problems and shortens the time required for the freezer compartment and the refrigerator compartment to return to a predetermined temperature after a power failure while ensuring the reliability of the compressor.

[0019]

In order to solve the above-mentioned problems, the refrigerator of the present invention has a condenser temperature sensor installed in a part of the high-pressure side pipe of a refrigeration cycle, and when the power is turned on, the freezer compartment temperature sensor and the condensation chamber are condensed. When both the condenser temperature sensors detect the set temperature or higher, or when the refrigerating room temperature sensor and the condenser temperature sensor both detect the set temperature or higher, the condenser temperature sensor further sets the upper limit set temperature when a predetermined time elapses thereafter. Only when the above is detected, the control means for stopping the operation of the blower fan for a preset time is provided. In addition, a means for detecting the power input value of the refrigerator body is provided, and when the power is turned on, both the freezer compartment temperature sensor and the condenser temperature sensor detect the set temperature or higher, or both the refrigerator compartment temperature sensor and the condenser temperature sensor set. A configuration in which a control unit is provided to stop the operation of the blower fan for a preset time only when the temperature is detected above the temperature and only when the power input value detection unit further detects above the upper limit set value when a predetermined time elapses thereafter. It is what

[0020]

With the above construction, the refrigerator of the present invention detects that both the condenser temperature sensor and the freezer compartment temperature sensor or the refrigeration compartment temperature sensor are above the set temperature when the power is turned on, that is, when the outside air temperature is high and uncooled. In that case, after a lapse of a predetermined time, the operation of the blower fan is stopped for a preset time only when the condenser temperature sensor or the power supply input value detection means is equal to or higher than the upper limit set value, that is, the input load to the compressor is excessive. When the load torque applied to the compressor is reduced and a power failure occurs in a sufficiently cooled state and the system recovers in a short time, the temperatures of the freezer compartment temperature sensor and the refrigeration compartment temperature sensor are low and are below the set temperature. Therefore, the above control is not performed and the normal control remains. Therefore, the time required for the freezer compartment and the refrigerator compartment to return to the predetermined temperature is not prolonged, and the stored food is not adversely affected.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigerator according to an embodiment of the present invention will be described below with reference to the drawings.

The same components as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 is a front view of a machine room portion in the refrigerator of the present invention. Reference numeral 23 denotes a condenser temperature sensor, which is installed in a part of the high-pressure side pipe 25 in the refrigeration cycle by a locking tool 24 formed of a material having high thermal conductivity such as metal. A temperature detection signal corresponding to the temperature of 25 is generated.

FIG. 2 is a block diagram showing a schematic electric configuration of a refrigerator according to the first and second embodiments of the present invention.
FIG. 3 is a flowchart of control of the refrigerator according to the first embodiment of the present invention, and FIG. 4 is a flowchart of control of the refrigerator according to the second embodiment of the present invention. In FIG. 2, the control circuit 26 is configured to include a microcomputer, and is configured to be supplied with power from a plug 17 connected to a commercial AC power source via a DC power source circuit 18, a freezer compartment temperature sensor 9, a refrigerating room. The compressor 4, the blower fan 7, the damper device 10, and the defrost heater 8 are received based on a control program stored in advance that receives input signals generated from the room temperature sensor 11, the defrost timer 16 and the condenser temperature sensor 23. It is configured to control the energization to the relays via the relays 19 to 22.

FIG. 5 is a block diagram showing a schematic electric configuration of a refrigerator according to the third and fourth embodiments of the present invention.
FIG. 6 is a flowchart of control of the refrigerator in the third embodiment of the present invention, and FIG. 7 is a flowchart of control of the refrigerator in the fourth embodiment of the present invention.

In FIG. 5, reference numeral 27 is a power input detecting means for generating a signal according to the power input value. The control circuit 28 is configured to include a microcomputer, and is configured to be supplied with power from a plug 17 connected to a commercial AC power source via a DC power supply circuit 18, and includes a freezer compartment temperature sensor 9 and a refrigerating compartment temperature sensor. 11, the defrost timer 16 and the input signal generated from the power input detection means 27 is received, and the compressor 4, the blower fan 7, the damper device 10 and the defrost heater 8 are energized based on a control program stored in advance. Control is performed via relays 19-22. FIG. 8 is a change characteristic diagram of the discharge side pressure of the compressor in the refrigerator of the present invention.

Regarding the refrigerator configured as described above,
The control will be described below. First, in the first embodiment, in FIG. 2 and FIG. 3, when the power is turned on, the compressor 4 and the blower fan 7 start operating (step P
1), immediately after that, the temperature D detected by the condenser temperature sensor 23
It is determined whether both A and the detected temperature DF of the freezer compartment temperature sensor 9 are equal to or higher than the set value Dmax (for example, 35 ° C.) (step P2).

When the detected temperatures DA and DF are both less than the set value Dmax, the normal control routine P8 is executed as it is, but when the detected temperatures DA and DF are both the set value Dmax or more, that is, the high temperature is reached. When it is detected that the temperature is outside and the temperature is not cooled, a predetermined time after that △
After T1 (for example, 20 minutes) has elapsed (step P3), the temperature DC detected by the condenser temperature sensor 23 is set to the upper limit set value DCm.
It is determined whether or not the temperature is ax (for example, 70 ° C.) or higher (step P4).

The detected temperature DC is the upper limit set value Dmax.
If it is less than the normal control routine P8
However, when the detected temperature DC is equal to or higher than the upper limit set value Dmax, that is, when the input load to the compressor 4 is excessive, the blower fan 7 is stopped from being energized (step P5) and preset. Time ΔT2 (for example 45
It waits until a lapse of (minutes) (step P6). Then, after ΔT2 has elapsed, the power supply to the blower fan 7 is restarted (step P7), and then the routine proceeds to the normal control routine P8.

2 and 4, in the second embodiment, when the power is turned on, the compressor 4 and the blower fan 7 start operating (step P1), and immediately after that, the condenser temperature sensor 23 It is determined whether both the detected temperature DA and the detected temperature DP of the refrigerating compartment temperature sensor 11 are equal to or higher than a set value Dmax (for example, 35 ° C.) (P2-1).

When both the detected temperatures DA and DP are less than the set value Dmax, the normal control routine P8 is executed as it is, but when the detected temperatures DA and DP are both the set value Dmax or more, that is, the high value is reached. When it is detected that the temperature is outside and the time is uncooled, after a predetermined time ΔT1 (for example, 20 minutes) has elapsed (step P3),
The temperature DC detected by the condenser temperature sensor 23 is the upper limit set value D.
It is determined whether or not there is Cmax (for example, 70 ° C.) or more (step P4).

Then, the detected temperature DC is the upper limit set value Dmax.
If it is less than the normal control routine P8
However, when the detected temperature DC is equal to or higher than the upper limit set value Dmax, that is, when the input load to the compressor 4 is excessive, the blower fan 7 is stopped from being energized (step P5) and preset. Time ΔT2 (for example 45
It waits until a lapse of (minutes) (step P6). Then, after ΔT2 has elapsed, the power supply to the blower fan 7 is restarted (step P7), and then the routine proceeds to the normal control routine P8.

5 and 6, in the third embodiment, when the power is turned on, the compressor 4 and the blower fan 7 start operating (step P1), and immediately after that, the condenser temperature sensor 23 It is determined whether the detected temperature DA and the detected temperature DF of the freezer compartment temperature sensor 9 are both set value Dmax (for example, 35 ° C.) or more (step P2).

When both the detected temperatures are less than the set value Dmax, the normal control routine P8 is executed as it is, but when the detected temperatures are both the set value Dmax or more, that is, when the outside air temperature is high, When it is detected that it is not cooled, a predetermined time ΔT1 (for example, 20 minutes)
After the elapse (step P3), it is determined whether or not the detection input value W of the power input detection means 27 is equal to or more than the upper limit set value Wmax (step P4-1).

Then, the detection input value W is the upper limit set value Wmax.
If it is less than the normal control routine P8
If the detected input value W is equal to or higher than the upper limit set value Wmax, that is, if the input load to the compressor 4 is excessive, the blower fan 7 is deenergized (step P5) and preset. The time ΔT2 (eg 45
It waits until a lapse of (minutes) (step P6). Then, after ΔT2 has elapsed, the power supply to the blower fan 7 is restarted (step P7), and then the routine proceeds to the normal control routine P8.

Next, in the fourth embodiment, in FIGS. 5 and 7, when the power is turned on, the compressor 4 and the blower fan 7 start operating (step P1), and immediately after that, the condenser temperature sensor 23 It is determined whether both the detected temperature DA and the detected temperature DP of the refrigerating compartment temperature sensor 11 are equal to or higher than a set value Dmax (for example, 35 ° C.) (P2-1).

When both the detected temperatures DA and DP are less than the set value Dmax, the normal control routine P8 is executed as it is, but when the detected temperatures DA and DP are both the set value Dmax or more, that is, the high value is reached. When it is detected that the temperature is outside and the time is uncooled, the detection input value W of the power supply input detecting means 27 is set to the upper limit set value Wma after a lapse of a predetermined time ΔT1 (for example, 20 minutes) (step P3).
It is determined whether x or more (step P4-1).

Then, the detection input value W is the upper limit set value Wmax.
If it is less than the above, the normal control routine P8 is executed as it is, but if the detected input value W is equal to or more than the upper limit set value Wmax, that is, if the input load to the compressor 4 is excessive, it is sent to the blower fan 7. Is stopped (step P5), and the process stands by until a preset time ΔT2 (for example, 45 minutes) elapses (step P6). Then △
After the lapse of T2, the power supply to the blower fan 7 is restarted (step P7), and then the routine shifts to the normal control routine P8.

The operation of the above control will be described with reference to FIG. Under conditions where the refrigerator is transported and installed in the summer, that is, when the outside temperature is high and uncooled (DA ≧ Dm
ax and DF ≧ Dmax, or DA ≧ Dmax and D
In P ≧ Dmax), when the power is turned on, the discharge side pressure of the compressor 4 sharply increases with the passage of time, and the load applied to the compressor 4 also increases in proportion thereto.

After that, when ΔT1 has elapsed (discharge side pressure Pd1)
If the detected temperature DC of the condenser temperature sensor 23 is equal to or higher than the upper limit set value DCmax, or if the detected input value W of the power input detecting means 27 is equal to or higher than the upper limit set value Wmax, then only the time of ΔT2. Since the blower fan 7 stops, the amount of heat exchange between the cooler 6 and the air in the refrigerator decreases during this period, and the discharge side pressure Pd of the compressor 4 also decreases.
Naturally, the input load on the compressor 4 also decreases.

However, during this time, the operation of the compressor 4 is continued, so that the refrigerant continues to circulate in the cooling system and the temperature of the cooler 6 is lowered. After that, when the operation of the blower fan 7 is restarted after a lapse of ΔT2, the discharge side pressure Pd of the compressor 4 has a relatively low value because the temperature of the cooler 6 has sufficiently decreased, and therefore the discharge side pressure Pd is lower than that when the power is turned on. The temperature rises in a gentle curve, reaches the maximum value Pdmax, then settles down to a value according to the temperature of the cooler 6, and stable operation is performed in a state where the increase in the input load to the compressor 4 is also suppressed.

After that, a power failure occurs at T3,
When the energization is restarted at a very short time T4, the control circuit 26 recognizes that the power is turned on, but the freezing compartment 2 or the refrigerating compartment 3 is still in a cooled state although it is higher than a predetermined temperature, Since the detected temperature DF of the temperature sensor 9 and the detected temperature DP of the refrigerating compartment temperature sensor 11 are both lower than the upper limit set temperature Dmax, the subsequent control is performed according to the normal control. Therefore, in the conventional example, after the energization is restarted after the power failure, ΔT2 is maintained even after ΔT1 has elapsed from the time point T4.
However, in the present embodiment, the blower fan 7 does not stop and continues to operate according to normal control.

In short, according to the configuration of the present embodiment, the load applied to the compressor 4 is reduced at the time of high outside temperature and in the uncooled state, the reliability of the compressor 4 is ensured, and the power supply is resumed at the time of power failure. , Freezer 2 and refrigerator 3
The effect on stored food can be reduced without unnecessarily prolonging the time required for the internal temperature of the container to return to a predetermined temperature.

[0043]

As described above, according to the present invention, the condenser temperature sensor is installed in a part of the high-pressure side pipe of the refrigeration cycle, and when the power is turned on, both the freezer compartment temperature sensor and the condenser temperature sensor are set temperature or higher. When it is detected, or when both the refrigerating room temperature sensor and the condenser temperature sensor detect the set temperature or more, and when the condenser temperature sensor detects the upper limit set temperature or more at a predetermined time after that, the preset value is set. The configuration is such that the control means that stops the operation of the blower fan for a specified period of time is provided to reduce the load on the compressor after the power is turned on and the reliability of the compressor when the outside temperature is high and when it is not cooled. In addition, it is possible to unnecessarily prolong the time for the internal temperature of the freezer compartment and the refrigerator compartment to return to a predetermined temperature after the resumption of power when a power failure occurs. The effect is obtained that to reduce the impact of the no stored food.

Further, means for detecting the power input value of the refrigerator main body is provided, and when the power is turned on, when both the freezer compartment temperature sensor and the condenser temperature sensor detect the set temperature or higher, or the refrigerator compartment temperature sensor and the condenser temperature sensor. When both of them detect a temperature equal to or higher than the set temperature, and only when the power supply input value detecting means further detects the upper limit set value or more when a predetermined time elapses thereafter, the control means for stopping the operation of the blower fan for a preset time. With such a configuration, the accuracy of detecting the input load applied to the compressor after the power is turned on is increased, and the effect of more reliably performing the input load reduction control applied to the compressor is obtained.

[Brief description of drawings]

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

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

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

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

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

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

FIG. 7 is a flowchart of a refrigerator control according to a fourth embodiment of the present invention.

FIG. 8 is a change characteristic diagram of the discharge side pressure of the compressor in the refrigerator of the present invention.

FIG. 9 is a vertical 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 the discharge side pressure of the compressor in the conventional refrigerator.

[Explanation of reference numerals] 2 freezer compartment 3 refrigerating compartment 4 compressor 7 blower fan 9 freezer compartment temperature sensor 11 refrigerating compartment temperature sensor 23 condenser temperature sensor 26 control circuit 27 power input detection means 28 control circuit

Claims (4)

[Claims] 1. A freezer compartment, a refrigerator compartment, a compressor,
A condenser, a refrigeration cycle including a cooler, a blower fan for forcibly convection the cool air cooled by the cooler to the freezer compartment and a refrigerating compartment, a condenser temperature sensor for detecting the temperature of the condenser, and the refrigeration A freezing room temperature sensor for detecting the temperature of the room and a means for controlling the energization of the blower fan are provided, and the temperatures of the freezing room temperature sensor and the condenser temperature sensor both detect the set temperature or more immediately after the power is turned on. When the condenser temperature sensor temperature is detected to be equal to or higher than the upper limit set temperature after a lapse of a predetermined time after the power is turned on, the electric power supply to the blower fan is stopped for a preset time. 2. A refrigerating compartment temperature sensor for detecting the temperature of the refrigerating compartment is provided, and when both the refrigerating compartment temperature sensor and the condenser temperature sensor detect a temperature equal to or higher than a preset temperature immediately after the power is turned on, after the power is turned on. The refrigerator according to claim 1, wherein when the condenser temperature sensor temperature is equal to or higher than an upper limit set temperature after a lapse of a predetermined time, energization of the blower fan is stopped for a preset time. 3. A refrigerator is provided with means for detecting power input, and when both the temperature of the freezer compartment temperature sensor and the temperature of the condenser temperature sensor detect a temperature equal to or higher than a preset temperature immediately after the power is turned on, a predetermined time elapses after the power is turned on. The refrigerator according to claim 1, wherein when the power input detecting means detects a value equal to or higher than an upper limit set value, the power supply to the blower fan is stopped for a preset time. 4. A means for detecting power input to a refrigerator, wherein a predetermined time has elapsed after power is turned on when both the temperature of the refrigerating compartment temperature sensor and the temperature of the condenser temperature sensor are above a preset temperature immediately after power is turned on. The refrigerator according to claim 2, wherein when the power input detection means detects a value equal to or higher than the upper limit set value, the power supply to the blower fan is stopped for a preset time.