JPH08313139A - Refrigerator - Google Patents

Abstract

PURPOSE: To make it possible to shorten a time for returning to predetermined temperatures of a freezing chamber and refrigerating chamber after service interruption by a method wherein the number of rotation of a blast fan is reduced for a preset period of time when both of the refrigerating chamber temperature and a room temper ature are higher than a set temperature immediately after throwing power supply while a pressure is higher than an upper limit set pressure after a predetermined period of time has elapsed. CONSTITUTION: When power is supplied, and the operation of a compressor 6 and a blast fan 9 are started, and when the detecting temperature of a room temperature sensor 16 as well as the detecting temperature of a refrigerating chamber temperature sensor 11 are higher than set values thereof immediately after the starting of the operation of the compressor 6 and the blast fan 9, or when the detecting pressure of a pressure detecting means 25 is higher than an upper limit value after a predetermined time has elapsed, or under a condition that the input load of the compressor 6 is excessive, a control circuit 27 reduces the number of rotation of the blast fan 9 and such a condition is maintained until a preset time is elapsed. Accordingly, the returning time of an inside temperature to a predetermined temperature will never be elongated after the energization is restarted whereby effects on stored foodstuff can be reduced.

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 control for reducing the load applied to a compressor in a conventional refrigerator, for example,
JP-A-5-240554 is known.

An example of a conventional refrigerator will be described below with reference to FIGS. 6, 7, 8 and 9.

FIG. 6 is a flow chart of control of a conventional refrigerator, FIG. 7 is a block diagram showing a schematic electric configuration of the refrigerator,
FIG. 8 is a longitudinal sectional view of the refrigerator, and FIG. 9 is a change characteristic diagram of the discharge side pressure of the compressor in the refrigerator.

In FIG. 8, a refrigerator main body 1 has a structure including a freezing compartment 2 and a refrigerating compartment 3, and a freezing compartment door 4 and a refrigerating compartment door 5 are attached to each compartment. A compressor 6 is arranged in the lower rear portion of the refrigerator body 1.

A cooling chamber 7 is formed in the rear portion of the freezing chamber 2, a cooler 8, a blower fan 9 and a defrosting heater 10 are installed in the cooling chamber 7, and a freezing chamber is provided in the freezing chamber 2. A temperature sensor 11 is attached.

A damper device 1 is provided on the rear surface of the refrigerator compartment 3.
2 and a refrigerating room temperature sensor 13 built-in temperature control device 1
4 is installed, and the damper device 12 and the cooling chamber 7 are connected by a duct 15. A room temperature sensor 16 is installed below the front surface of the freezer compartment door 4.

In FIG. 7, the freezer compartment temperature sensor 11 generates a temperature detection signal according to the temperature of the freezer compartment 2, and the refrigerating compartment temperature sensor 13 generates a temperature detection signal according to the temperature of the refrigerating compartment 3 at room temperature. The sensor 16 is configured to generate a temperature detection signal according to the installation ambient temperature DS of the refrigerator main body 1, and these temperature detection signals are given to the control circuit 17.

The defrost timer 18 generates a defrost signal at every predetermined defrost cycle, and the defrost signal is given to the control circuit 17. The control circuit 17 is configured to include, for example, a microcomputer, and is configured to be supplied with power from a plug 19 connected to a commercial AC power supply via a DC power supply circuit 20.

The control circuit 17 controls the energization of the compressor 6, the blower fan 9, the damper device 12 and the defrosting heater 10 based on the above-mentioned input signals and the previously stored control program. It is configured to run via 24.

In FIG. 6, among the controls by the control circuit 17,
Only the portion related to the gist of the present invention is shown, and this will be described below.

When the power is turned on, the compressor 6 and the blower fan 9 start operating (step S1), and in this state, the system 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 16 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 6 is increased. Under the increasing condition, the blower fan 9 is stopped (step S4), and waits until the preset time ΔT2 elapses (step S5).

After the lapse of ΔT2, energization of the blower fan 9 is restarted (step S6), and then the normal control routine S7 is entered. Incidentally, this normal routine S7 is a very general one, and the operation control of the compressor 6 and the blower fan 9 is performed based on the temperature detection signal from the freezer compartment temperature sensor 11, and the temperature detection signal from the refrigerating compartment temperature sensor 13 is used. Based on the opening and closing control of the damper device 12,
The energization control of the defrost heater 10 is performed based on the defrost signal from the defrost timer 18.

The operation in such control is shown in FIG.
Will be described with reference to. When the refrigerator is transported in the summer and the power is turned on, the discharge side pressure of the compressor 6 sharply increases with time, and the load applied to the compressor 6 also increases in proportion to it. After that, when ΔT1 has elapsed (discharge side pressure Pdl) and the temperature DS detected by the room temperature sensor 16 is equal to or higher than the upper limit temperature Dmax, the blower fan 9 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 6 also decreases, and naturally the input load to the compressor 6 also decreases. However, during this time, the compressor 6
Since the operation is continued, the refrigerant continues to circulate in the cooling system and the temperature of the cooler 8 decreases. After that, when the operation of the blower fan 9 is restarted after the lapse of ΔT2, the discharge side pressure Pd of the compressor 6 has a relatively low value because the temperature of the cooler 8 is sufficiently lowered, and therefore the discharge side pressure Pd is lower than that at the time of power-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 8, and the increase in the input load to the compressor 6 is also suppressed.

[0016]

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 addresses the above problems and shortens 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.

[0018]

In order to solve the above-mentioned problems, the refrigerator of the present invention has a refrigerating compartment, a refrigerating compartment, a refrigerating cycle equipped with a compressor, a condenser, and a cooler, and is cooled by the cooler. A blower fan for forced convection of cold air to the freezing compartment and the refrigerating compartment, a high pressure detecting means for detecting the high pressure side pressure of the refrigeration cycle, a freezing compartment temperature sensor for detecting the temperature of the freezing compartment, and an outside air temperature detection. When the temperature of the freezer compartment temperature sensor and the temperature of the room temperature sensor are both above the set temperature immediately after the power is turned on, the pressure detecting means is above the upper limit set pressure after a predetermined time has passed after the power is turned on. In the case where the above is detected, a control circuit for reducing the rotation speed of the blower fan for a preset time is provided.

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 room temperature sensor detect a temperature equal to or higher than a preset temperature immediately after the power is turned on, a predetermined time is passed after the power is turned on. After the lapse of time, when the high pressure detecting means detects a pressure equal to or higher than the upper limit set pressure, a fan control circuit is provided to reduce the rotation speed of the blower fan for a preset time.

[0020]

With the above-described structure, the refrigerator of the present invention has the following features when the room temperature sensor and the freezer compartment temperature sensor or the refrigeration compartment temperature sensor are both above the set temperature when the power is turned on, that is, when the outside air temperature is high and uncooled. When it is detected, after a predetermined time has passed, the high pressure detection means is higher than the upper limit set value,
That is, only when the input load to the compressor is excessive, the rotation speed of the blower fan is reduced for a preset time, so that the load torque applied to the compressor is reduced and a power failure occurs in a sufficiently cooled state. However, when the temperature is restored in a short time, the temperatures of the freezer compartment temperature sensor and the refrigerating compartment temperature sensor are low and below the set temperature, so the above control is not performed and the normal control is maintained. 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 flowchart of the control of the refrigerator in the first embodiment of the present invention. FIG. 2 is a front view of the machine room of the refrigerator in the first and second embodiments of the present invention, in which 25 is a high pressure detection means, which is installed in a part of the high pressure side pipe 26 in the refrigeration cycle. The pressure detection signal corresponding to the pressure of the refrigerant discharged from the compressor 6 is generated.

FIG. 3 is a block diagram showing a schematic electric configuration of the refrigerator in the first and second embodiments of the present invention.

In FIG. 3, the control circuit 27 is configured to include a microcomputer, and is supplied with power from a plug 19 connected to a commercial AC power source via a DC power source circuit 20. The compressor 6, the blower fan 9, based on a control program stored in advance, which receives input signals generated from the sensor 11, the refrigerator compartment temperature sensor 13, the room temperature sensor 16, the defrost timer 18, and the high pressure detection means 25. The energization control of the damper device 12 and the defrost heater 10 is configured to be executed via the relays 21 to 24.

FIG. 4 is a flow chart of control of the refrigerator in the second embodiment of the present invention. FIG. 5 is a change characteristic diagram of 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. First, in the first embodiment, in FIG. 1 and FIG. 3, when the power is turned on, the compressor 6 and the blower fan 9 start operating (step P
1), immediately after that, the detected temperature DS of the room temperature sensor 16 and the detected temperature DF of the freezer compartment temperature sensor 11 are both set value D.
It is determined whether or not it is equal to or higher than max (for example, 35 ° C.) (step P2).

When both the detected temperatures DS and DF are less than the set value Dmax, the normal control routine P8 is executed as it is, but when both the detected temperatures DS and DF are the set value Dmax or more, that is, high. 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 pressure Pd of the pressure detection means 25 is set to the upper limit set value Pdmax.
It is determined whether (for example, 1.8 MPa) or more (step P4).

The detected pressure Pd is the upper limit set value Pdma.
If it is less than x, the normal control routine P is used as it is.
8 is executed, but the detected pressure Pd is the upper limit set value Pdmax.
When the above is the case, that is, when the input load to the compressor 6 is excessive, the control circuit 27 reduces the amount of current supplied to the blower fan 9 to reduce the rotation speed of the blower fan 9 (step P5). Preset time ΔT2
The state is maintained (for example, 45 minutes) (step P6).

After the lapse of ΔT2, the control circuit 27 restores the amount of current supplied to the blower fan 9 to the normal amount (step P7), and then shifts to the normal control routine P8.

In the second embodiment, as shown in FIGS. 3 and 4, when the power is turned on, the compressor 6 and the blower fan 9 start operating (step P1), and immediately after that, the temperature DS detected by the room temperature sensor 16 is detected. And cold room temperature sensor 13
Detected temperature DP of both is set value Dmax (for example, 35
(° C.) or higher (step P2).

When both the detected temperatures DS 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 DS and DF are the set value Dmax or more, that is, high. 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 pressure Pd of the pressure detection means 25 is set to the upper limit set value Pdmax.
It is determined whether (for example, 1.8 MPa) or more (step P4).

The detected pressure Pd is the upper limit set value Pdma.
If it is less than x, the normal control routine P is used as it is.
8 is executed, but the detected pressure Pd is the upper limit set value Pdmax.
When the above is the case, that is, when the input load to the compressor 6 is excessive, the control circuit 27 reduces the amount of current supplied to the blower fan 9 to reduce the rotation speed of the blower fan 9 (step P5). Preset time ΔT2
The state is maintained (for example, 45 minutes) (step P6).

After the lapse of ΔT2, the control circuit 27 restores the amount of current supplied to the blower fan 9 to the normal amount (step P7), and then 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 (DS ≧ Dm
ax and DF ≧ Dmax, or DS ≧ Dmax and D
In P ≧ Dmax), when the power is turned on, the discharge side pressure of the compressor 6 sharply increases with the passage of time, and the load applied to the compressor 6 also increases in proportion thereto.

After that, when ΔT1 has elapsed (discharge side pressure Pdl)
In addition, when the detected pressure Pd of the high pressure detection means 25 is equal to or higher than the upper limit set value Pdmax, the rotation speed of the blower fan 9 becomes low for a period of ΔT2 thereafter, and during this period, the cooler 8 and the air in the refrigerator are separated. The amount of heat exchange of the compressor 6 decreases, the discharge side pressure Pd of the compressor 6 also decreases, and naturally the input load to the compressor 6 also decreases.

However, during this time, the operation of the compressor 6 is continued, so that the refrigerant continues to circulate in the cooling system and the temperature of the cooler 8 is lowered. Then, after the lapse of ΔT2, when the number of rotations of the blower fan 9 returns to the normal value, the discharge side pressure Pd of the compressor 6 has a sufficiently low temperature of the cooler 8, so that the power is turned on while exhibiting a relatively low value. The curve rises in a gentler curve than the time, and after reaching the maximum value Pdmax, it reaches a value corresponding to the temperature of the cooler 8,
Stable operation is performed with the increase in the input load to the compressor 6 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 although the freezing compartment 2 or the refrigerating compartment 3 is higher than a predetermined temperature, it is still in a cooled state and the freezing compartment temperature is high. Since the detected temperature DF of the sensor 11 and the detected temperature DP of the refrigerating compartment temperature sensor 13 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 9 does not stop and continues to operate according to the normal control.

In short, according to the configuration of the present embodiment, the load applied to the compressor 9 is reduced at high outside air temperature and in the uncooled state, the reliability of the compressor 6 is ensured, and the energization is resumed after a 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.

[0038]

As described above, according to the present invention, a known refrigerating cycle including a freezer compartment, a refrigerating compartment, a compressor, a condenser and a cooler, and cold air cooled by the cooler are stored in the freezer compartment and the refrigerating compartment. A blower fan forcibly convection to the chamber, a high pressure detection means for detecting the high pressure side pressure of the refrigeration cycle,
A freezer compartment temperature sensor that detects the temperature of the freezer compartment and a room temperature sensor that detects the outside air temperature are provided, and when the temperatures of the freezer compartment temperature sensor and the room temperature sensor are both above a set temperature immediately after power-on. When a predetermined time has elapsed after turning on the power and the pressure detecting means detects a pressure equal to or higher than the upper limit set pressure, a control circuit for reducing the rotation speed of the blower fan for a preset time is provided. At high outside air temperature and uncooled, the load on the compressor is reduced after the power is turned on to ensure the reliability of the compressor, and at the time of power failure, the temperature inside the freezer and refrigerating compartments is reopened after the power is turned on again. It is possible to obtain the effect of reducing the influence on the stored food without unnecessarily prolonging the time required for the product to return to a predetermined temperature.

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 room temperature sensor detect a temperature equal to or higher than a preset temperature immediately after the power is turned on, a predetermined time is passed after the power is turned on. After the lapse of time, when the high pressure detection means detects a pressure higher than the upper limit set pressure, a control circuit for reducing the rotation speed of the blower fan to a low speed for a preset time is provided. In the uncooled state, the load applied to the compressor after the power is turned on is reduced, and the reliability of the compressor is secured.At the time of a power failure, the internal temperature of the freezer compartment and the refrigerator compartment is set to a predetermined temperature after the power supply is restarted. It is possible to obtain the effect of reducing the influence on the stored food without unnecessarily prolonging the time required to return to.

[Brief description of drawings]

FIG. 1 is a flowchart for controlling a refrigerator according to a first embodiment of the present invention.

FIG. 2 is a front view of a machine room portion of a refrigerator according to the first and second embodiments of the present invention.

FIG. 3 is a block diagram showing a schematic electric configuration of a refrigerator according to the first and second embodiments 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 change characteristic diagram of the discharge side pressure of the compressor in the refrigerator of the present invention.

FIG. 6 is a flowchart of control of a conventional refrigerator.

FIG. 7 is a block diagram showing a schematic electric configuration of a conventional refrigerator.

FIG. 8 is a vertical sectional view of a conventional refrigerator.

FIG. 9 is a change characteristic diagram of the discharge side pressure of the compressor in the conventional refrigerator.

[Explanation of symbols]

 2 Freezing room 3 Refrigerating room 6 Compressor 9 Blower fan 11 Freezing room temperature sensor 13 Refrigerating room temperature sensor 16 Room temperature sensor 25 Pressure detection means 27 Control circuit

Claims (2)

[Claims] 1. A freezer compartment, a refrigerator compartment, 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 refrigerating compartment and a refrigerating compartment, and a high pressure detecting means for detecting a high pressure side pressure of the refrigerating cycle, A freezer compartment temperature sensor that detects the temperature of the freezer compartment and a room temperature sensor that detects the outside air temperature are provided, and when the temperatures of the freezer compartment temperature sensor and the room temperature sensor are both above a set temperature immediately after power-on. A control circuit is provided which, when a predetermined time has elapsed after the power is turned on and the pressure detecting means detects a pressure equal to or higher than the upper limit set pressure, reduces the rotation speed of the blower fan for a preset time. refrigerator. 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 room temperature sensor detect a temperature equal to or higher than a preset temperature immediately after the power is turned on, a predetermined time after the power is turned on. The control circuit for reducing the rotation speed of the blower fan for a preset time when the high pressure detection means detects a pressure higher than or equal to an upper limit pressure after a lapse of time is provided. Refrigerator.