JPH09113091A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operational reliability of a compressor when the power supply is turned on and also to shorten the time required for the refrigerator temperature during a power failure to return to a prescribed temperature. SOLUTION: In a refrigerator, a compressor 4 and a blower fan 7 are turned on immediately after the power supply is switched on. When both of the temperature DA of a condenser temperature sensor 23 and the temperature DF of a freezing chamber temperature sensor 9 are a set temperature Dmax or above at this time and further when the temperature DC of the condenser temperature sensor 23 is an upper-limit set value Dcmax or above at the time point after a prescribed time ΔT1 passes from that time, the blower fan 7 is held in a state of low-speed operation only for a prescribed time ΔT2 thereafter and a normal control is conducted after this state of low-speed operation passes.

Description

Detailed Description of the Invention

[0001]

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

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 body 1 has a freezer compartment 2 and a refrigerator compartment 3, and each compartment has a door (the 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.

A cooling chamber 5 is formed on the rear surface 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, and a part of the freezing chamber 2 is provided. Is equipped with a freezer temperature sensor 9.

[0007] A damper device 1 is provided on the rear side of the refrigerator compartment 3.
Temperature control device 1 with built-in 0 and refrigerator 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, a freezer compartment temperature sensor 9 generates a temperature detection signal corresponding to the temperature of the freezer 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 DS of the refrigerator main body 1, and these temperature detection signals are given to the control circuit 15.

The defrost timer 16 generates a defrost signal every 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 supply via a DC power supply 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. ˜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 normal control routine S7 is started. Incidentally, this normal control routine S7
This is a very general one, and the compressor 4 and the blower fan 7 are based on the temperature detection signal from the freezer temperature sensor 9.
The operation control is performed, the opening / closing control of the damper device 10 is performed based on the temperature detection signal from the refrigerating compartment temperature sensor 11, and the energization control of the defrost heater 8 is performed based on the defrost signal from the defrost timer 16. It has become.

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.

After that, when ΔT1 has elapsed (the discharge side pressure Pd
In l), the detected temperature DS of the room temperature sensor 14 is the upper limit temperature D.
If it is more than max, the blower fan 7 is stopped for a period of ΔT2, so that the heat exchange amount between the cooler 6 and the air in the refrigerator is reduced during this time, and the discharge side pressure Pd of the compressor 4 is also lowered. The input load on 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, when the operation of the blower fan 7 is resumed after ΔT2 has elapsed, the discharge side pressure Pd of the compressor 4 is turned on while exhibiting a relatively low value because the temperature of the cooler 6 has sufficiently decreased. It rises in a gentler curve than at the time, shows the maximum value Pdmax, and then calms down to a value corresponding to the temperature of the cooler 6.
The increase in the input load to the motor is also suppressed.

[0019]

However, in the above configuration, when the outside air temperature is high (that is, when DS ≧ Dmax),
When a power failure occurs in a state where the freezing room and the refrigerator compartment are sufficiently cooled and the power is restored in a short time, the same as when the power is turned on.
After the elapse of T1, the blower fan is stopped during ΔT2, so that the time required for the freezing compartment and the refrigerator compartment to return to the predetermined temperature is prolonged, which has a problem of adversely affecting the stored food.

The present invention has been made to solve the above-mentioned problems and aims at shortening the time required for the freezing chamber and the refrigerating chamber to return to a predetermined temperature after a power failure while ensuring the reliability of the compressor.

[0021]

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 setting the operation of the blower fan to the low speed operation for a preset time is provided.

Further, means for detecting the power input value of the refrigerator 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. Only when both the sensors detect a temperature equal to or higher than the set temperature, and the power input value detecting means further detects the upper limit set value or more when a predetermined time elapses thereafter, the operation of the blower fan is set to a low speed operation for a preset time. The control means for controlling is provided.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION With the above configuration, the refrigerator of the present invention has a condenser temperature sensor and a freezer compartment temperature sensor or a refrigerating compartment temperature sensor both at or above a preset temperature when the power is turned on, that is, when the outside air temperature is high and uncooled When a certain condition is detected, after a lapse of a predetermined time, only when the condenser temperature sensor or the power supply input value detection means exceeds the upper limit set value, that is, the input load to the compressor is excessive, the blower fan is operated for a preset time. Since it operates at low speed, the load torque applied to the compressor is reduced and
If 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 refrigerator compartment temperature sensor are low and below the set temperature, so the above control is not performed and normal control is continued. Becomes 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.

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 denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a front view of a machine room in a refrigerator according to the present invention. Reference numeral 23 denotes a condenser temperature sensor, which is provided at 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 a 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 embodiment and the second embodiment 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, and a refrigerator. 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 damper device 10 and the defrost heater 8 on the basis of a control program stored in advance which receives input signals generated from the room temperature sensor 11, the defrost timer 16 and the condenser temperature sensor 23. The energization control is performed 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. 27 in FIG.
Is a power input detection means, which generates a signal according to a 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,
Relay of energization control to the compressor 4, the blower fan 7, the damper device 10, and the defrost heater 8 based on a control program stored in advance that receives input signals generated from the defrost timer 16 and the power input detection means 27. 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,
Hereinafter, the control will be described. First, in the first embodiment, in FIGS. 2 and 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 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).

When both the detected temperatures DA and DF are 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 value is reached. When it is detected that the temperature is outside and the temperature is not cooled, a predetermined time after that △
After a lapse of T1 (for example, 20 minutes) (step P3), the detected temperature DC of the condenser temperature sensor 23 becomes the upper limit set value DCm.
ax (for example, 70 ° C.) or more is determined (step P4).

Then, the detected temperature DC is the upper limit set value Dmax.
If less than the normal control routine P8
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 operated at a low speed (step P5) and preset. The low speed operation state is maintained until the lapsed time ΔT2 (for example, 45 minutes) has elapsed (step P6).

After the lapse of ΔT2, the operation of the blower fan 7 is returned to the normal operation (step P7), and then the normal control routine P8 is entered).

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 detected temperature DC of the condenser temperature sensor 23 is the upper limit set value D.
It is determined whether the temperature is equal to or higher than Cmax (for example, 70 ° C.) (step P4). The detected temperature DC is equal to the upper limit set value D.
If it is less than max, the normal control routine P8 is executed as it is, but if the detected temperature DC is equal to the upper limit set value Dma
When it is equal to or more than x, that is, when the input load to the compressor 4 is excessive, the blower fan 7 is operated at a low speed (step P5), and the preset time ΔT2 is reached.
The low-speed operation state is maintained (for example, 45 minutes) (step P6). After that, after the lapse of ΔT2, the operation of the blower fan 7 is returned to the normal operation (step P7),
After that, the routine shifts 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 unit 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 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 operated at a low speed (step P5), and The low speed operation state is maintained until the set time ΔT2 (for example, 45 minutes) has elapsed (step P6).

Thereafter, after the lapse of ΔT2, the operation of the blower fan 7 is returned to the normal operation (step P7), and then the normal control routine P8 is entered.

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 both the detected temperatures DA and DP are the set value Dmax or more, that is, the high value. 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 or not there is x or more (step P4-1).

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, under the condition that the input load to the compressor 4 is excessive, the blower fan 7 The operation is set to the low speed operation (step P5), and the low speed operation state is maintained until the preset time ΔT2 (for example, 45 minutes) has elapsed (step P6). Then, after ΔT2 has elapsed, the operation of the blower fan 7 is returned to the normal operation (step P7), and then the normal control routine P8 is entered.

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
When (P ≧ 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 increases in proportion thereto.

After that, when the result of ΔT1 is reached (discharge side pressure Pdl)
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 operates at a low speed, the heat exchange amount between the cooler 6 and the air in the refrigerator decreases during this period, the discharge side pressure Pd of the compressor 4 also decreases, and naturally the input load to the compressor 4 also decreases. come.

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 decreases.

After that, when the operation of the blower fan 7 returns to the normal operation after the 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. However, the temperature rises in a gentler curve than when the power is turned on, and after reaching the maximum value Pdmax, it reaches a value corresponding to the temperature of the cooler 6, and the increase in the input load to the compressor 4 is also suppressed. It will be stable operation.

After that, a power failure occurs at time T3,
When the power supply is resumed at a very short time T4, the control circuit 26 recognizes that the power is turned on, but the freezing room 2 or the refrigerating room 3 is still cooled even though the temperature is higher than a predetermined temperature, and Since both the detected temperature DF of the temperature sensor 9 and the detected temperature DP of the refrigerator compartment temperature sensor 11 are 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, the blower fan 7 is stopped for a period of ΔT2 even after ΔT1 has passed from the time point T4, but in the present embodiment, the blower fan 7 is stopped. Without it, it will continue 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 when the outside air temperature is high and uncooled, the reliability of the compressor 4 is ensured, and the power supply is restarted during a power failure. , Freezer 2 and refrigerator 3
The effect on the stored food can be reduced without unnecessarily prolonging the time for the internal temperature of the refrigerator to return to the predetermined temperature.

[0048]

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. It is configured to provide a control means for operating the blower fan at a low speed for a predetermined time,
When the outside temperature is high and uncooled, the load on the compressor after power is turned on is reduced, and the reliability of the compressor is ensured. It is possible to obtain the effect of reducing the influence on the stored food without unnecessarily lengthening the time required to return to the predetermined temperature.

Further, means for detecting the power input value of the refrigerator 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. Only when both the sensors detect a temperature equal to or higher than the set temperature, and the power input value detecting means further detects the upper limit set value or more when a predetermined time elapses thereafter, the operation of the blower fan is set to a low speed operation for a preset time. By providing the control means for controlling, the detection accuracy of 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 the drawings]

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

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

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

FIG. 4 is a flowchart of control of a refrigerator in a 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 control of a refrigerator in a 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 a discharge side pressure of a compressor in the refrigerator 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 3 Refrigerator 4 Compressor 7 Blower fan 9 Refrigerator temperature sensor 11 Refrigerator temperature sensor 23 Condenser temperature sensor 26 Control circuit 27 Power input detection means 28 Control circuit

Claims (4)

[Claims] A refrigerator, a refrigerator, 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 operation of the blower fan is set to a low speed operation for a preset time. Refrigerator to do. 2. A freezing room, a refrigerator room, a compressor,
A refrigeration cycle including a condenser and a cooler, a blower fan for forcedly convection the cool air cooled by the cooler into the freezer compartment and the refrigerating compartment, a condenser temperature sensor for detecting the temperature of the condenser, and the refrigeration A refrigerating compartment temperature sensor for detecting the temperature of the compartment and a means for controlling the energization of the blower fan are provided, and both the refrigerating compartment temperature sensor and the condenser temperature sensor both detect a temperature equal to or higher than a preset temperature 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 operation of the blower fan is set to a low speed operation for a preset time. Refrigerator to do. 3. 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 freezer compartment temperature sensor for detecting the temperature of the compartment, a means for controlling the energization of the blower fan,
And a means for detecting the power input of the refrigerator, and when both the temperature of the freezer compartment temperature sensor and the temperature of the condenser are both set temperature or more 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. A refrigerator characterized in that, when the input detection means detects a value equal to or higher than the upper limit set value, the blower fan is operated at a low speed for a preset time. 4. A refrigerator, a refrigerator, a compressor,
A refrigeration cycle including a condenser and a cooler, a blower fan for forcedly convection the cool air cooled by the cooler into the freezer compartment and the refrigerating compartment, a condenser temperature sensor for detecting the temperature of the condenser, and the refrigeration A refrigerating compartment temperature sensor for detecting the temperature of the compartment, a means for controlling the energization of the blower fan,
And a means for detecting a power input of the refrigerator, and when both the temperature of the refrigerating compartment temperature sensor and the temperature of the condenser are both set temperature or more immediately after the power is turned on, the power source is turned on after a predetermined time has passed after the power is turned on. A refrigerator characterized in that, when the input detection means detects a value equal to or higher than the upper limit set value, the blower fan is operated at a low speed for a preset time.