JPH06300420A - Control apparatus for refrigerator - Google Patents

Abstract

PURPOSE:To prevent a rotary compressor from failing due to the burning of winding resulting from the deteriorated heat radiating performance of the rotary compressor by rotating a compressor blower at a high speed so as to cool the rotary compressor when the temperature in a machine chamber is particularly high, in a control apparatus for a refrigerator. CONSTITUTION:The tile apparatus is provided with a microcomputer 19 to the input side of which a temperature detector 3 for detecting the outside temperature and a temperature detector 21 for detecting the temperature in a machine chamber are connected. A driving means 6 for operating a rotary compressor 5, a driving means 8 for operating a compressor blower 7 and a rotational speed control means 20 for controlling the compressor blower 7 are respectively connected to the output side of the microcomputer 19. When the temperature in the machine chamber is especially high, the compressor blower 7 is rotated at a high speed in order to cool the rotary compressor 5.

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, and 16 is a suction pipe. The rotary compressor 5, condenser 14, decompression (not shown), cooler 15 and suction pipe 16 constitute a series of refrigeration cycles. . Reference numeral 17 denotes a blower for forcedly convection the air cooled by the cooler 15 into the freezer compartment 11 and the refrigerating compartment 12. 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 flowchart showing the entire 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 unnecessarily. There is no need to operate 7 and wasteful consumption of electric power and shortening of the life of the compressor blower 7 are prevented.

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 so as to stop the blower 7 for the compressor.

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

[0014]

However, according to the above-mentioned conventional configuration, when the machine room is hermetically closed under the condition that the refrigerator is installed when the outside air temperature is low, the blower for the compressor is stopped and the rotary compression is performed. There was a drawback that the machine became hot and the winding failure due to deterioration of heat dissipation performance was induced.

The present invention solves the conventional problems.
The purpose is to prevent winding failure due to deterioration of heat radiation performance of the rotary compressor when the machine room temperature is high.

[0016]

In order 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 when the temperature of a machine room is high,
This blower for a compressor is rotated at a high speed in synchronization with a rotary compressor to operate.

[0017]

In the controller of the refrigerator of the present invention, when the temperature of the machine room is high, the blower for the compressor operates at high speed,
The surface temperature of the rotary compressor decreases.

[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 rotation speed control means 20 for increasing the rotation speed of the compressor blower 7 is connected to the output of a control microcomputer 19 (hereinafter, referred to as a microcomputer).

A machine room temperature detector 21 provided in the machine room 13 is input to the microcomputer 19.

FIG. 2 is a sectional view of a refrigerator provided with the control device having the above-described circuit configuration 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 described 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 the data of 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, at step 203, the state of the machine room temperature detector 21 is read. For example, when the temperature is lower than 30 ° C., at step 204, the rotation speed of the compressor blower 7 is changed to normal rotation (for example, 3600 rpm). The rotation speed control means 20 is set. 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, when the temperature inside the machine room 13 becomes high during low outside air (for example, when the operating time of the rotary compressor 5 under high load increases), in step 203,
The machine room temperature detector 21 judges that the temperature is, for example, 30 ° C. or higher, and the rotation speed of the compressor blower 7 is set to a high speed rotation (for example, 4000 rpm) in step 206.
Set.

Then, in step 205, a signal is output to the drive means 7 to operate the compressor blower 7. Therefore, when the machine room temperature of the machine room 13 is 30 ° C. or higher,
Since the compressor blower 7 operates at high speed, the amount of cooling air increases, the surface temperature of the rotary compressor 5 decreases, and seizure failure of the winding due to deterioration of heat dissipation performance is suppressed.

After that, if the freezer compartment 11 is cooled to a predetermined temperature, it is judged in step 201 that the temperature detector 3 is low, and in step 207, the rotary compressor 5 and the blower 17 are installed.
The signal of the driving means 6 is cut off in order to stop. And
In step 208, the signal of the driving means 8 is cut off so as to stop the blower 7 for the compressor.

[0027]

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, and a temperature detector for detecting the temperature inside the refrigerator,
Provided in a machine room accommodating the rotary compressor, in synchronization with the operation of the rotary compressor, a blower for the compressor for forcibly cooling the rotary compressor, and a machine room temperature detector for detecting the temperature of the machine room. When the machine room temperature detector is above a predetermined temperature, since it is equipped with a control circuit for rotating the compressor blower at high speed, if the machine room temperature is particularly high, 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 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 21 Machine Room Temperature Detector

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. The blower for the compressor that forcibly cools the rotary compressor in synchronization with the operation of, the machine room temperature detector that detects the machine room temperature, and the blower for the compressor when the machine room temperature detector is equal to or higher than a predetermined temperature. A control device for a refrigerator including a control circuit for rotating the refrigerator at a high speed.