JPH08303929A - Refrigerator - Google Patents

Abstract

PURPOSE: To shorten a period of time for the returning to specified temperatures of a freezer chamber and refrigerator chamber by a method wherein when a defrosting completion-detecting means detects a temperature which is a set temperature or higher at the time of turning-on of the power, the operation of a blowing fan is stopped for a previously set period of time only when the defrosting completion-detecting means detects a condensation temperature sensor upper limit set temperature or higher after a specified period of time has passed. CONSTITUTION: When a detected temperature of a defrosting completion-detecting means 9 right after the start of operations of a compressor 4 and blowing fan 7 is a set value or higher at the time of turning on of a power source, i.e., when it is detected that the outside air temperature is high, and a cooling is not done yet, a judgement whether a detected temperature of a condenser temperature sensor 24 is an upper limit set value or higher or not is performed after a specified period of time has passed after the detection. Then, when the detected temperature is the upper limit set value or higher, i.e., under a state wherein an input load to the compressor is too large, power is prevented from being connected to the blowing fan 7, and the blowing fan is made to stand by until a previously set period of time passes. Then, after the specified period of time has passed, the power connection to the blowing fan 7 is resumed, and the control is transferred to a normal control routine.

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, there is one disclosed in Japanese Patent Laid-Open No. 5-240554.

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 characteristic view which shows change.

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 cooling device 6, a blower fan 7, and a cooling chamber 5 are formed in the cooling chamber 5.
A defrost heater 8 and a defrost end detection means 9 are installed, and a freezer compartment temperature sensor 10 is attached to a part of the freezer compartment 2.

At the rear portion of the refrigerating compartment 3, a damper device 1 is provided.
1 and a refrigerating room temperature sensor 12
3 is installed, the damper device 11 and the cooling chamber 5 are ducts 1
They are connected by 4. A room temperature sensor 15 is installed at the lower front portion of the freezer compartment door 3a.

In FIG. 10, a freezer compartment temperature sensor 10 is shown.
Generates a temperature detection signal according to the temperature of the freezer compartment 2, the refrigerating compartment temperature sensor 12 generates a temperature detection signal according to the temperature of the refrigerating compartment 3, and the room temperature sensor 15 changes the installation ambient temperature DS of the refrigerator body 1 The temperature detection signal is generated according to the temperature detection signal, and each of the temperature detection signals is given to the control circuit 16.

The defrost timer 17 generates a defrost signal for each predetermined defrost cycle, and the defrost signal is given to the control circuit 16. The defrost end is detected by the defrost end detection means 9. .

The control circuit 16 is composed of, for example, a microcomputer, and has a plug 18 connected to a commercial AC power source.
From the DC power supply circuit 19.

The control circuit 16 relays on / off control to the compressor 4, the blower fan 7, the damper device 11 and the defrost heater 8 on the basis of the above-mentioned input signals and the previously stored control program. ˜23 to be executed.

FIG. 11 shows only the part of the control by the control circuit 16 which 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 in this state, the operation waits until a predetermined time ΔT1 elapses (step S2). When the time ΔT1 has elapsed, it is determined whether the temperature DS detected by the room temperature sensor 15 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 situation, the blower fan 7 is stopped (step S
4) Wait until the preset time ΔT2 has elapsed (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.

The energization routine S7 is very general, 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 10 to detect the temperature from the refrigerating compartment temperature sensor 12. The opening / closing control of the damper device 11 is performed based on the signal, the energization control of the defrost heater 8 is performed based on the defrost signal from the defrost timer 17, and the defrost heater 8 is energized by the defrost end detection means 9. It is supposed to stop.

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) and 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 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 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 been sufficiently lowered, and the discharge side pressure Pd is milder than when the power is turned on. The temperature rises in a different 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.

[0019]

However, in the above-mentioned structure, when the outside temperature is high (that is, when DS ≧ Dmax),
Even when a power failure occurs in a state where the freezer compartment 2 and the refrigerating compartment 3 are sufficiently cooled and the power is restored in a short time, the blast fan 7 is stopped for a period of ΔT2 after ΔT1 as in the case of turning on the power. Therefore, there is a problem that the freezing compartment 2 and the refrigerating compartment 3 take a long time to return to a predetermined temperature, which adversely affects the stored food.

The present invention has been made to solve the above problems and shortens the time required for the freezing room and the refrigerating room 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 the refrigeration cycle, and when the power is turned on, the defrosting end detecting means is A control circuit that stops the operation of the blower fan for a preset time only when the temperature detected above the set temperature, and only when the condenser temperature sensor further detects the upper set temperature or above at the time when a predetermined time has elapsed after that. It is configured to be provided.

Further, a means for detecting a power input value of the refrigerator body is provided, and when the defrosting end detecting means detects a temperature equal to or higher than a preset temperature when the power is turned on, the power input value detecting means further detects when a predetermined time has elapsed. Only when the upper limit set value or more is detected, a control circuit for stopping the operation of the blower fan for a preset time is provided.

Further, means for detecting the pressure of the refrigeration cycle is provided, and when the defrosting end detecting means detects a temperature equal to or higher than the set temperature when the power is turned on, the pressure detecting means further exceeds the upper limit set value when a predetermined time elapses thereafter. A control circuit is provided to stop the operation of the blower fan for a preset time only when the above is detected.

[0024]

In the refrigerator of the present invention having the above-described structure, when the defrosting completion detecting means detects that the temperature is equal to or higher than the set temperature when the power is turned on, that is, when the outside temperature is high and uncooled, the refrigerator is condensed after a predetermined time. The load torque applied to the compressor is stopped because the blower fan operation is stopped for a preset time only when the device temperature sensor, the power supply input value detection means, or the pressure detection means is above the upper limit set value, that is, when the input load to the compressor is excessive. The temperature of the defrosting completion detection means is low and is below the set temperature when a power failure occurs in a sufficiently cooled state and it returns in a short time. Will remain. 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.

[0025]

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 of the refrigerator of the present invention. In FIG. 1, reference numeral 24 denotes a condenser temperature sensor, which is installed in a part of the high-pressure side pipe 26 in the refrigeration cycle by a locking tool 25 formed of a material having high heat conductivity such as metal. A temperature detection signal corresponding to the temperature of the high pressure side pipe 26 is generated.

FIG. 2 is a block diagram showing a schematic electric configuration of the refrigerator according to the first embodiment of the present invention, and FIG. 3 is a flowchart of control of the refrigerator according to the first embodiment of the present invention. In FIG. 2, the control circuit 27 is configured to include a microcomputer, and has a plug 18 connected to a commercial AC power supply.
Power is supplied from the DC circuit 19 via the DC circuit 19, and the inputs generated from the defrosting end detecting means 9, the freezing compartment temperature sensor 10, the refrigerating compartment temperature sensor 12, the defrosting timer 17 and the condenser temperature sensor 24. Based on a control program that receives a signal and is stored in advance, the compressor 4,
The blower fan 7, the damper device 11, and the defrost heater 8 are configured to control the energization via the relays 20 to 23.

Regarding the refrigerator configured as described above,
The control will be described below. 2 and 3, when the power is turned on, the compressor 4 and the blower fan 7 start operating (step P1), and immediately thereafter, the temperature DE detected by the defrosting completion detecting means 9 is set to a set value Dmax (for example, 35 ° C.). ) It is judged whether or not there is more (step P
2).

When the detected temperature DE is less than the set value Dmax, the normal control routine P8 is executed as it is, but when the detected temperature DE is not less than the set value Dmax, that is, when the outside temperature is high and the temperature is not yet high. When it is detected that the cooling is being performed, after a predetermined time ΔT1 (for example, 20 minutes) has elapsed (step P3), it is determined whether the temperature DC detected by the condenser temperature sensor 24 is equal to or higher than the upper limit set value DCmax (for example, 70 ° C.). A judgment is made (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).

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

FIG. 4 is a block diagram showing a schematic electric configuration of a refrigerator according to the second embodiment of the present invention, and FIG. 5 is a flow chart of control of the refrigerator according to the second embodiment of the present invention. In FIG. 4, 28 is a power supply input detecting means, which generates a signal according to the power supply input value.

The control circuit 29 is configured to include a microcomputer, and is configured to be supplied with power from a plug 18 connected to a commercial AC power source via a DC circuit 19. The compressor 4, the blower fan 7, and the damper device are received based on the control program stored in advance, which receives the input signals generated from the room temperature sensor 10, the refrigerating room temperature sensor 12, the defrost timer 17, and the power input detection means 28. 11 and the defrost heater 8 are energized to control the relays 20 to 23.

Regarding the refrigerator constructed as described above,
The control will be described below. 4 and 5,
When the power is turned on, the compressor 4 and the blower fan 7 start operating (step P1), and immediately thereafter, whether or not the temperature DE detected by the defrosting end detecting means 9 is equal to or higher than a set value Dmax (for example, 35 ° C.). Is determined (step P2).

When the detected temperature is less than the set value Dmax, the normal control routine P8 is executed as it is, but when both the detected temperature are the set value Dmax or more, that is, when the outside temperature is high and the temperature is not yet reached. When it is detected that the cooling is being performed, after a predetermined time ΔT1 (for example, 20 minutes) has elapsed (step P3), it is determined whether or not the detection input value W of the power input detection means 28 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. Time ΔT2 (for example 45
It waits until a lapse of (minutes) (step P6). After the lapse of ΔT2, the energization of the blower fan 7 is restarted (step P7), and then the normal control routine P8 is entered.

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 flow chart of control of the refrigerator according to the third embodiment of the present invention. In FIG. 6, reference numeral 30 is a pressure detecting means, which generates a pressure detection signal corresponding to the pressure. The control circuit 31 is configured to include a microcomputer, and is configured to be supplied with power from a plug 18 connected to a commercial AC power source via a DC circuit 19. The defrosting completion detecting means 9 and the freezer compartment temperature sensor. 10, cold room temperature sensor 12, defrost timer 1
7 and the input signal generated from the pressure detection means 30, based on the control program stored in advance, the energization of the compressor 4, the blower fan 7, the damper device 11 and the defrost heater 8 is controlled via the relays 20 to 23. Configured to run. FIG. 8 is a characteristic diagram showing changes in the discharge side pressure of the compressor in the refrigerator of the present invention.

Regarding the refrigerator constructed as described above,
The control will be described below. 6 and 7,
When the power is turned on, the compressor 4 and the blower fan 7 start operating (step P1), and immediately thereafter, whether or not the temperature DE detected by the defrosting end detecting means 9 is equal to or higher than a set value Dmax (for example, 35 ° C.). Is determined (P2-1).

When the detected temperature DE is less than the set value Dmax, the normal control routine P8 is executed as it is, but when the detected temperature DE is the set value Dmax or more, that is, when the outside temperature is high and the temperature is not yet high. When it is detected that it is cooling, after a predetermined time ΔT1 (for example, 20 minutes) elapses (step P3), the detected pressure Pd of the pressure detection means 29 is detected.
Is determined to be equal to or greater than the upper limit set value Pdmax (step 4-1).

Then, the detected pressure value Pd is the upper limit set value Pdm.
If it is less than ax, the normal control routine P8 is directly used.
However, the detected pressure value Pd is set to the upper limit set value Pdmax.
If the above is the case, that is, if the input load to the compressor 4 is excessive, the power supply to the blower fan 7 is stopped (step P5), and the process waits until the preset time ΔT2 (for example, 45 minutes) elapses. (Step P6).

After the lapse of ΔT2, the energization of the blower fan 7 is restarted (step P7), and then the energization 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 (DE ≧ Dm
In ax), when the power is turned on, the discharge side pressure of the compressor 4 rapidly rises with the passage of time, and the load applied to the compressor 4 also increases in proportion thereto. After that, when ΔT1 has elapsed (discharge side pressure Pd1), the detected temperature DC of the condenser temperature sensor 24 is set to the upper limit set value DCm.
If it is ax or more, or the power input detection means 28
If the detected input value W of is greater than or equal to the upper limit set value Wmax, or if the detected pressure value Pd of the pressure detection means 30 is greater than or equal to the upper limit set value Pdmax, then the blower fan 7 is stopped for a period of ΔT2. The amount of heat exchange between the cooler 6 and the air in the cold storage 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 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 decreases.

After that, when the operation of the blower fan 7 is restarted 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 been sufficiently lowered, so that when the power is turned on. The temperature rises along a gentler curve, reaches the maximum value Pdmax, and then stabilizes at a value according to the temperature of the cooler 6, and stable operation is performed in a state in which the increase in the input load to the compressor 4 is also suppressed. .

After that, a power failure occurs at time T3,
When the energization is restarted at a very short time T4, the control circuit 27 recognizes that the power is turned on, but the freezing compartment 2 or the refrigerating compartment 3 is still above the predetermined temperature but is still cooled and defrosted. Since the detected temperature DE of the end detection means 9 is 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, ΔT1 is maintained even after ΔT1 has elapsed from the time point T4.
Although the blower fan 7 was stopped for 2 hours, the blower fan 7 does not stop in this embodiment, and the operation is continued according to the normal control.

In short, according to the configuration of this 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 restarted 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.

[0047]

As described above, according to the present invention, a 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 and the defrosting completion detecting means detects the upper limit set temperature or more, After that, only when the condensation temperature sensor detects a temperature equal to or higher than the upper limit set temperature when a predetermined time has elapsed, a control circuit for stopping the operation of the blower fan for a preset time is provided. At the time of uncooling, the load applied to the compressor after turning on the power is reduced, the reliability of the compressor is secured, and at the time of power failure, the internal temperature of the freezing room and the refrigerating room is kept at a predetermined temperature after resuming energization. It is possible to obtain the effect of reducing the influence on the stored food without unnecessarily prolonging the time required to return to 0.

Further, means for detecting the power input value of the refrigerator main body is provided, and when the power is turned on, when the defrosting end detecting means detects a temperature equal to or higher than the upper limit set temperature, a predetermined time after that, the power input value detecting means is further provided. When the temperature exceeds the upper limit set temperature, only when the power supply input value detecting means further detects the upper limit set value or more at a time when a predetermined time has elapsed after that,
By configuring a control circuit that stops the operation of the blower fan for a preset time, the accuracy of detecting the input load applied to the compressor after power is turned on is increased, and the input load reduction control applied to the compressor is executed more reliably. The effect is obtained.

Further, a pressure detecting means is provided in a part of the high-pressure side pipe of the refrigeration cycle, and when the defrosting completion detecting means detects a temperature above the upper limit set temperature when the power is turned on, the pressure is further detected at a predetermined time after that. By providing a control circuit that stops the operation of the blower fan for a preset time only when the means detects the upper limit set value or more,
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 the refrigerator according to the first embodiment of the present invention.

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

FIG. 4 is a block diagram showing a schematic electric configuration of a refrigerator according to a second embodiment of the present invention.

FIG. 5 is a flowchart of control of the refrigerator in the 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 a refrigerator control according to the third embodiment of the present invention.

FIG. 8 is a characteristic diagram showing changes in 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 characteristic diagram showing changes in discharge side pressure of a compressor in a conventional refrigerator.

[Explanation of symbols]

 2 Freezer 3 Refrigerator 4 Compressor 6 Cooler 7 Blower fan 9 Defrosting end detection means 10 Freezer temperature sensor 12 Refrigerator temperature sensor 24 Condenser temperature sensor 27 Control circuit 28 Power input detection means 29 Control circuit 30 Pressure detection means 31 Control circuit

Claims (3)

[Claims] 1. A freezer, a refrigerator, a compressor,
A condenser, a refrigeration cycle including a cooler, a blower fan for forcing convection of the cool air cooled by the cooler into the freezer compartment and a refrigerating compartment, a condenser temperature sensor for detecting the temperature of the condenser, and Defrosting completion detection means installed in the cooler, and a control circuit for controlling the energization of the blower fan, when the temperature of the defrosting completion detection means immediately after turning on the power detects a set temperature or more, A refrigerator characterized by stopping energization to the blower fan for a preset time when the condenser temperature sensor temperature is detected to be equal to or higher than an upper limit set temperature after a lapse of a predetermined time after power-on. 2. A refrigeration cycle including a freezer, a refrigerator, a compressor, 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, and the condenser. A condenser temperature sensor for detecting the temperature of the cooler, a defrosting completion detecting means installed in the cooler, a control circuit for controlling energization of the blower fan, and a power input detecting means for detecting the power input of the refrigerator With and
When the temperature of the defrosting completion detection means is detected to be equal to or higher than the set temperature immediately after the power is turned on, and when the power input detection means detects the upper limit set value or higher after a predetermined time has passed after the power is turned on, the preset value is set. A refrigerator characterized in that energization to the blower fan is stopped for a certain period of time. 3. A refrigeration cycle including a freezer, a refrigerator, a compressor, 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, and the condensing A condenser temperature sensor for detecting the temperature of the cooler, a defrosting completion detecting means installed in the cooler, a control circuit for controlling energization to the blower fan, and a pressure detecting means for detecting the pressure of the refrigeration cycle. When the temperature of the defrost detecting means is detected to be equal to or higher than the set temperature immediately after the power is turned on, if the pressure detecting means detects the upper limit set value or more after a predetermined time has passed after the power is turned on, the preset value is set. A refrigerator characterized in that energization of the blower fan is stopped for a predetermined time.