JPH0719694A - Controlling device of refrigerator - Google Patents

Abstract

PURPOSE:To prevent a burning failure of a winding due to deterioration of the radiation performance of a rotary compressor by cooling the rotary compressor by rotating a compressor blower at a high speed when the compressor is driven continuously for a prescribed time or longer. CONSTITUTION:A control device 18 wherein a temperature detector 3 is connected to a microcomputer 19 having a timer 20 integrating time of a continuous operation of a rotary compressor 5 and wherein a driving means 6 for operating the rotary compressor 5, a driving means 8 for operating a blower 7 for the compressor and a revolution number control means 21 for the blower 7 for the compressor are connected respectively to outputs of the microcomputer 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator using a rotary compressor, and more particularly to a refrigerator in which the rotary compressor is cooled by a blower.

[0002]

2. Description of the Related Art In recent years, in many refrigerators, a small rotary compressor is used as a compressor of a refrigeration cycle in order to effectively use a space in a refrigerator.

As a conventional operation control of a refrigerator, there is one disclosed in Japanese Patent Application Laid-Open No. 2-136669. Hereinafter, operation control of a conventional refrigerator will be described with reference to the drawings.

FIG. 4 is a block diagram of a conventional refrigerator control device. In FIG. 4, reference numeral 1 denotes a control device, which is a control microcomputer 2 (hereinafter referred to as a microcomputer).
Further, the temperature detector 3 and the outside air temperature detector 4 are input. The output of the microcomputer 2 is connected to a drive means 6 for operating the rotary compressor 5 and a drive circuit 8 for operating the compressor blower 7, respectively.

FIG. 5 is a sectional view of a refrigerator provided with the control device having the above circuit configuration. 9 is a refrigerator body, and a partition wall 10
Is divided into a freezer compartment 11 at the top and a refrigerating compartment 12 at the bottom. A machine room 13 is provided below the refrigerator body 9. A rotary compressor 5 is provided in the machine room 13 together with the compressor blower 7. A condenser 14 is provided inside the outer wall of the refrigerator body 9. Reference numeral 15 is a cooler, 16 is a suction pipe, and the rotary compressor 5, condenser 14, decompression (not shown), cooler 1
5. The suction pipe 16 constitutes a series of refrigeration cycles.

Reference numeral 17 designates the freezing compartment 11 and the refrigerating compartment 12
A blower for forcedly convection the air cooled by the cooler 15. Reference numeral 3 is a temperature detector for detecting the temperature in the freezer compartment 11 and for instructing the operation of the rotary compressor 5 and the blower 17. Reference numeral 4 denotes an outside air temperature detector for detecting the outside air temperature, which is provided in a part of the outer shell of the refrigerator body 9.

Further, a control device 1 having the above-mentioned circuit is attached to the rear surface of the refrigerator body 9.

Referring to the flow chart of FIG. 6, the following will describe the control device for the refrigerator constructed as described above.
The operation will be described.

FIG. 6 is a flow chart showing the main part of the control program stored in the microcomputer 2. When the power is turned on, in step 100, all the microcomputer data is cleared and initialization is performed. Next, at step 101, the state of the temperature detector 3 is read, and if the temperature of the freezer compartment 11 is higher than the set value, at step 102, a signal is output to the driving means 6 to operate the rotary compressor 5, and cooling is performed. The vessel 15 performs a cooling action. At the same time, the blower 17 is operated to cool the cool air cooled by the cooler 15.
1. Ventilation is forced into the refrigerator compartment 12.

Next, in step 103, the state of the outside air temperature detector 4 is read, and when the temperature is, for example, 20 ° C. or higher, the driving means 7 is operated in step 104 to operate the compressor blower 7.
To the rotary compressor 5. For this reason,
The temperature of the surface of the rotary compressor 5 is lowered, and the seizure failure of the winding due to the deterioration of the heat radiation performance is suppressed.

In step 103, when the outside air temperature detector 4 is, for example, less than 20 ° C., in step 106, the signal of the drive circuit 8 is cut off so as to stop the blower 7 for the compressor. Therefore, when the temperature of the rotary compressor 5 does not originally rise, that is, when the outside air temperature is low, the compressor blower 7 provided for the rotary compressor 5 stops unnecessarily, so that the compressor blower is unnecessary. There is no need to operate 7 to waste power and shorten the life of the compressor blower 7.

After that, if the freezer compartment 11 is cooled to a predetermined temperature, it is judged at step 101 that the temperature detector 3 is low, and at step 105, the rotary compressor 5 and the blower 17
The signal of the driving means 6 is cut off in order to stop. Then, in step 106, the signal of the driving means 8 is cut off to stop the compressor blower 7.

Thereafter, this operation is repeated to perform a normal cooling operation.

[0014]

However, in the above-mentioned conventional structure, even in winter when the outside air temperature is low, when the door temperature is increased and the door temperature is increased and the internal temperature rises, the compressor is operated continuously. Even if the compressor blower does not operate and is synchronized with the rotary compressor, and the compressor blower operates, the rotation speed of the compressor blower is the same as during normal operation, so the cooling air volume does not change and heat dissipation performance However, there is a drawback in that it causes seizure failure of the winding due to deterioration of temperature.

The present invention solves the conventional problems.
The purpose of the invention is to prevent winding failure due to deterioration of heat radiation performance of the rotary compressor when the rotary compressor is frequently used.

[0016]

To achieve this object, a control device for a refrigerator according to the present invention comprises a compressor blower for cooling a rotary compressor, and the rotary compressor is continuously operated for a predetermined time or longer. In this case, the blower for the compressor is operated at high rotation in synchronization with the rotary compressor.

[0017]

In the refrigerator control device of the present invention, when the rotary compressor is continuously operated for a predetermined time or longer, the blower for the compressor operates at a high speed, so that the cooling air volume increases and the surface of the rotary compressor increases. The temperature drops.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigerator according to an embodiment of the present invention will be described with reference to FIGS. It should be noted that the same components as those of the related art are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a block diagram of a control device for a refrigerator according to this embodiment. In FIG. 1, reference numeral 18 denotes a control device, and a control microcomputer 19 (hereinafter, referred to as a microcomputer) has a timer 20 for measuring a continuous operation time of a rotary compressor, and an output of the microcomputer 19 is provided. Is a rotation speed control means 2 for increasing the rotation speed of the blower 7 for the compressor.
1 is connected.

FIG. 2 is a sectional view of a refrigerator provided with the control device having the above-mentioned circuit structure of the present invention, and the control device 18 having the above-mentioned circuit is attached to the rear surface.

With reference to the flow chart of FIG. 3, the control device for the refrigerator constructed as above will be described below.
The operation will be described. FIG. 3 is a flowchart showing the entire control program stored in the microcomputer 19.

When the power is turned on, in step 200, all data in the microcomputer 19 is cleared and initialization is performed. Next, at step 201, the state of the temperature detector 3 is read, and if the temperature of the freezer compartment 11 is higher than the set value, at step 202 a signal is output to the driving means 6 to operate the rotary compressor 5. The cooler 15 performs a cooling action. At the same time, the blower 17 is operated and the cooler 15
The cold air cooled by is forcedly blown to the freezing compartment 11 and the refrigerating compartment 12.

Next, in step 203, the state of the timer 20 is read. For example, if it is less than 60 minutes, step 2
In 04, the rotation speed control means 21 is set to the normal rotation speed (for example, 3600 rpm) of the compressor blower 7. Then, in step 205, a signal is output to the drive means 7 to operate the compressor blower 7, and air is blown to the rotary compressor 5. Here, especially in a high load environment such as opening and closing of doors in winter, the rotary compressor 5 is continuously operated, and in step 203, for example, when the timer is determined to be 60 minutes or more, in step 206, the rotation of the compressor blower 7 is performed. The number
The rotation speed control means 21 is set to high speed rotation (for example, 4000 rpm). Then, in step 205, a signal is output to the drive means 7 to operate the compressor blower 7.
If the freezer compartment 11 is cooled to the predetermined temperature, it is determined in step 201 that the temperature detector 3 is low, and step 20
At 7, the signal of the driving means 6 is cut off to stop the rotary compressor 5 and the blower 17. Then, in step 208, the signal of the driving means 8 is cut off so as to stop the blower 7 for the compressor. For this reason, when the rotary compressor 5 continuously operates, the blower for the compressor operates at high speed when the rotary compressor 5 is continuously operated without being affected by the outside air temperature, especially when the environmental condition in winter is bad. The temperature of the surface of the compressor 5 drops,
Winding failure of the winding due to deterioration of heat dissipation performance is suppressed.

[0024]

As is apparent from the above embodiments, according to the present invention, a refrigeration cycle including a rotary compressor, a condenser, a cooler and a suction pipe, a temperature detector for detecting the temperature inside the refrigerator, and It has a compressor blower that is provided in a machine room that houses a rotary compressor and that forcibly cools the rotary compressor in synchronization with the operation of the rotary compressor, and a timer that integrates the continuous operation time of the rotary compressor. When the timer is equal to or longer than a predetermined time, it is equipped with a control circuit for rotating the blower for the compressor at a high speed. During operation, the blower for the compressor rotates at high speed, the amount of cooling air blown to the rotary compressor increases, the surface temperature of the rotary compressor decreases, and seizure failure of the winding due to deterioration of heat dissipation performance is suppressed. ,
It has a great effect.

[Brief description of drawings]

FIG. 1 is a block diagram of a control circuit of a refrigerator according to an embodiment of the present invention.

FIG. 2 is a sectional view of the refrigerator.

[Fig. 3] Flow chart of the refrigerator

FIG. 4 is a block diagram of a control circuit of a refrigerator showing a conventional example.

FIG. 5 is a sectional view of the refrigerator.

FIG. 6 is a flowchart of the refrigerator.

[Explanation of symbols]

 3 Temperature Detector 4 Outside Air Temperature Detector 5 Rotary Compressor 7 Compressor Blower 13 Machine Room 14 Condenser 15 Cooler 16 Suction Pipe 18 Control Device 19 Microcomputer 20 Rotation Speed Control Means

Claims (1)

[Claims] 1. A refrigeration cycle composed of a rotary compressor, a condenser, a cooler and a suction pipe, a temperature detector for detecting a temperature inside the refrigerator, and a rotary compressor provided in a machine room accommodating the rotary compressor. Of the compressor for forcibly cooling the rotary compressor in synchronization with the operation of, and a timer for integrating the continuous operation time of the rotary compressor, when the timer is a predetermined time or more, for the compressor A control device for a refrigerator equipped with a control circuit for rotating a blower at high speed.