JPH08247598A - Operation controller for refrigerator - Google Patents

Abstract

PURPOSE: To enable keeping of a discharge-side pressure-peak of a compressor lower by operating the compressor below the maximum number of revolutions simultaneously with the closing of a power source and at the initial number of revolutions until a discharge pipe sensor temperature falls below a specified value when the sensor temperature is at the specified value or higher after the setting up of a timer. CONSTITUTION: When a power source is closed, a compressor 20 is operated, for example, at the number of revolutions 90% of the maximum number of revolutions, while a blower 22 is energized electrically to start the cooling of the inside of a storage. Under such a condition, standing-by is made for a specified time and after a specified time passes, the detected temperature (t) of a temperature sensor mounted on a discharge pipe of the compressor 22 is compared with a set temperature t1 and when t>t1, standing-by is also made under such a condition. On the other hand, when t<t1, the number of revolutions of the compressor 22 is raised to 100% and thereafter, the operation enters the normal control routine. This enables lowering of a pressure peak at the start without stopping the blower while eliminating the stoppage of the blower thereby restricting changes in the discharge side pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for a refrigerating storage room such as a refrigerator and a showcase.

[0002]

2. Description of the Related Art Conventionally, as operation control of a refrigerator used for a cooling device such as a refrigerator, for example, Japanese Patent Laid-Open No. 5-2405 has been proposed.
That is the example shown in Japanese Patent Publication No. 56-56, and FIGS.
Follow the explanation below.

FIG. 4 shows a vertical sectional structure of a refrigerator.
Reference numeral 1 denotes a refrigerator main body, which includes an outer box 2, an inner box 3, and a foamed heat insulating material 4 filled between the outer box 2 and the inner box 3. Reference numeral 5 is a freezing room, 6 is a refrigerating room, and a cooler 8, a blower 9 and the like are provided at the back of a back wall 7 of the freezing room 5. Reference numeral 10 is a freezer compartment sensor that detects the temperature of the freezer compartment 5, and 11 is a compressor.

FIG. 5 partially shows an electric control device for a refrigerator. Reference numeral 12 is a control circuit, which is constituted by including a microcomputer, for example, from a plug 13 connected to a commercial AC power supply to a DC power supply circuit. Power is supplied via 14.

This control circuit 12 includes a freezer compartment sensor 10.
Based on the control program stored in advance on the basis of information from the relay 1 and the like, the relay 1 is used to connect and disconnect the compressor 11 and the blower 9.
5, 16 are configured to be executed.

FIG. 6 is a flow chart for explaining a part of the control contents by the control circuit 12. The operation of the above structure will be described below. When the power is turned on, that is, when the plug 13 is connected to the commercial AC power source, the compressor 11
And the fan 9 is electrically connected. The cool air produced by the cooler 8 is guided to the freezer compartment 5 and the refrigerating compartment 6 by the blower 9 to cool the interior (step S1). In this state, the predetermined time Δ
It waits until T1 passes (step S2). Time Δ
When T1 elapses, the blower 9 is cut off to stop its operation and suspend the cooling of the inside of the warehouse (step S
3).

In this state, the process stands by until a predetermined time ΔT2 elapses (step S4). When the time ΔT2 has elapsed, the blower 9 is energized again (step S5), and thereafter, the process proceeds to the normal control routine S6.

Attention will be paid to the pressure on the discharge side of the compressor in the process from step S1 after the power is turned on to the normal control routine S6. First, in step S1 after the power is turned on, the amount of heat exchange between the cooler 8 and the inside air is large, and the evaporation temperature is high.
Therefore, the discharge side pressure of the compressor rises rapidly.

Next, when the blower 9 is stopped in step S3, the heat exchange in the cooler 8 is also stopped, so that the evaporation temperature sharply drops. That is, the evaporating power in the cooler 8 is changed to a low state, and during that time, the rise of the evaporating temperature of the discharge side pressure of the compressor is controlled.

When the operation of the blower 9 is restarted in step S5, the discharge side pressure is also increased with the increase of the evaporation temperature, but immediately after the operation of the blower 9 is restarted, the temperature of the cooler 8 is sufficiently lowered. Therefore, the discharge side compression of the compressor exhibits a relatively low value, rises once and then reaches the maximum value, and then settles to a value corresponding to the temperature of the cooler 8.

FIG. 7 illustrates the discharge side pressure transition of these series of compressors. As is apparent from FIG. 7, when the blower 9 is stopped, the discharge side pressure peak of the compressor is Δ.
P is suppressed to a low level, and the load torque of the compressor can be reduced accordingly and the size of the compressor can be reduced (dotted line indicates pressure transition when the blower 9 is not stopped).

[0012]

However, in the above-mentioned configuration, the blower operation is stopped in order to survive the high load at the time of start-up, during which the cooling of the inside of the refrigerator is stopped and the cooling rate is increased. It will become dull.

Further, there is a large difference in the load amount of the compressor between when the blower is stopped and when the blower is in operation, and there is a great problem in the reliability of the compressor against load fluctuations.

In view of the above problems, the present invention is intended to prevent a decrease in cooling rate as much as possible and further improve the reliability of the compressor.

[0015]

In order to solve the above problems, a refrigerator according to the present invention controls a compressor, a rotation speed control means for controlling the rotation speed of the compressor, and a temperature of a discharge pipe of the compressor. It consists of a discharge pipe sensor for detecting and a timer that integrates for a predetermined time, and at the same time as turning on the power, the compressor is operated at a maximum rotation speed or less and the timer is started.
After the timer setup, when the discharge pipe sensor temperature is below a predetermined temperature, the compressor is operated at the maximum rotation speed, and when the discharge pipe sensor temperature is above a predetermined temperature, the discharge pipe sensor temperature is below a predetermined temperature. The compressor will be operated at the initial speed until it becomes.

[0016]

According to the present invention, with the above-described structure, the compressor is operated at the maximum rotation speed or less when the power is turned on. Therefore, the discharge side pressure peak of the compressor can be suppressed to a low level without stopping the blower. Further, since the blower is not stopped, the extreme fluctuation of the discharge side pressure of the compressor is eliminated.

[0017]

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

FIG. 1 is a diagram showing a schematic electric control device for a refrigerator according to an embodiment of the present invention. Reference numeral 17 denotes a control circuit including a microcomputer, for example, a plug 18 connected to a commercial AC power source to a DC power source circuit 19. The power is supplied via the.

Reference numeral 20 is a compressor, 21 is a rotation speed control means for controlling the compressor 20, 22 is a blower, and 23 is a blower 22.
An on / off relay of No. 24, and 24 is an inside temperature detecting means. 25
Is a timer that starts its operation at the same time when the power is turned on and outputs an output after a lapse of a certain time. A discharge pipe sensor 26 detects the temperature of the discharge pipe of the compressor 20.

FIG. 2 is a flow chart for explaining a part of control contents by the control circuit 17. The operation of this configuration will be described below. When the power is turned on, that is, when the plug 18 is connected to the commercial AC power source, the compressor 20 is operated at a rotation speed of 90% of the maximum rotation speed, and the blower 22 is also energized to start cooling the inside of the refrigerator. Yes (step S7).

In this state, the process stands by until a predetermined time ΔT3 has passed (step S8). After the time ΔT3 has passed,
Discharge pipe sensor temperature t attached to the discharge pipe of the compressor 22
1 is compared with a preset temperature t1 to determine its magnitude. If t> t1, it stands by in this state (step S9).

When the discharge pipe sensor temperature becomes t≤t1, the compressor 22 increases its rotation speed to 100% (step S1).
0), and then the normal control routine is entered. Although description of normal control is omitted in particular, it means control to control ON / OFF of the compressor from the freezer room sensor signal and to control opening / closing of the damper from the refrigerating room sensor signal to maintain the inside of the refrigerator at a predetermined temperature. To do.

FIG. 3 shows the transition of pressure on the discharge side of the compressor in the process from step S7 after the power is turned on to the normal control routine S11. First, in step S7 after the power is turned on, the compressor 20 and the blower 22 are energized. The discharge side pressure rises.

However, the compressor 22 is 90% of the maximum rotation speed.
Since it is operated at the number of revolutions, the refrigerant circulation amount is about 9
It becomes 0% and the pressure on the discharge side changes as shown by the solid line.
The pressure P1 is a pressure peak at 90% rotation. The broken line shows the pressure change at 100% rotation speed, and P2 is the pressure peak.

Next, in step S9, after confirming the elapse of a predetermined time ΔT3, the discharge pipe sensor temperature (pressure in the discharge pipe) is checked to determine the number of revolutions of the compressor thereafter. This is when the discharge side pressure is high. When the number of revolutions of the compressor is increased by, the pressure peak P3 generated after the number of revolutions switching may exceed P1, and a high load at the time of starting cannot be overcome and a compressor protection device (not shown) may operate. Because.

Thus, the pressure peak at the time of starting can be lowered from P2 to P1 by ΔP without stopping the blower. Further, since the blower is not stopped, the discharge side pressure does not change extremely.

[0027]

As described above, according to the present invention, the compressor, the rotation speed control means for controlling the rotation heat of the compressor, the discharge pipe sensor for detecting the temperature of the discharge pipe of the compressor, and the predetermined time period are provided. It consists of a timer that integrates, and at the same time when the power is turned on, the compressor is operated at the maximum rotation speed or less and the timer is started, and after the timer setup, the compressor is operated when the discharge pipe sensor temperature is below a predetermined temperature. When the discharge pipe sensor temperature is equal to or higher than a predetermined temperature, the compressor is operated at the initial rotation speed until the discharge pipe sensor temperature becomes equal to or lower than a predetermined temperature. The discharge side pressure peak of the compressor can be kept low by ΔP without stopping. Therefore, since the load torque of the compressor is reduced, the size of the compressor can be reduced, and since it is not necessary to stop the blower after the power is turned on, the cooling speed does not become extremely slow.

Further, since the blower is not stopped, the discharge side pressure is not extremely changed, and the reliability of the compressor can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic electric control device of a refrigerator according to an embodiment of the present invention.

FIG. 2 is a control flowchart of the refrigerator in the embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a transition of pressure on a discharge side of a compressor according to an embodiment of the present invention.

FIG. 4 is a vertical sectional view of a conventional refrigerator.

FIG. 5 is a block diagram showing a schematic electric control device of a conventional refrigerator.

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

FIG. 7 is a characteristic diagram showing a transition of pressure on a discharge side of a compressor in a conventional refrigerator.

[Explanation of symbols]

 17 Control Circuit 19 DC Power Supply Circuit 20 Compressor 21 Rotation Speed Control Means 25 Timer 26 Discharge Pipe Sensor

Claims (1)

[Claims] 1. A power supply comprising a compressor, a rotation speed control means for controlling a rotation speed of the compressor, a discharge pipe sensor for detecting a temperature of a discharge pipe of the compressor, and a timer for integrating for a predetermined time. At the same time as turning on, the compressor is operated at a maximum rotation speed or less and the timer is started.After the timer setup, when the discharge pipe sensor temperature is a predetermined temperature or less, the compressor is operated at the maximum rotation speed, and An operation control device for a refrigerator characterized in that, when the discharge pipe sensor temperature is equal to or higher than a predetermined temperature, the compressor is operated at an initial rotation speed until the discharge pipe sensor temperature becomes equal to or lower than a predetermined temperature.