JPH0660777B2 - Operation control device for refrigerator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a refrigerator operation control device.

Conventional configuration and its problems Conventionally, the control of the refrigerator that changes the rotation speed of the compressor is to determine the rotation speed of the compressor by the difference between the internal temperature of the refrigerator and the set temperature,
When the internal temperature is higher than the set temperature, the compressor is operated at high rotation speed, when the internal temperature is equal to the set temperature, the compressor is operated at low speed, and when the internal temperature is lower than the set temperature, the compressor is turned off. It was a thing. For example, as shown in FIG. 3, when the difference between the set temperature and the internal temperature is ± 1 ° C. (set temperature zone), the compressor is operated at 1800 rpm, and if it is below the set temperature zone, the compressor is turned off and When the temperature is higher than the set temperature by 5 ° C., the compressor is operated at 3600 rotations, and when the temperature is higher than the set temperature, the compressor is operated at 5400 rotations. In this control method, if the temperature inside the refrigerator equilibrates in the set temperature zone, continuous operation of 1800 rotations is performed, and this causes the compressor to rotate at a low speed, so it is easy to run out of oil to the sliding parts It had the drawback of causing trouble.

SUMMARY OF THE INVENTION Therefore, the present invention is to eliminate the trouble of operation due to insufficient oil supply to the sliding portion of the compressor.

To achieve this object, the present invention provides a timer that operates at a rotation speed higher than 0 rotation and a rotation speed lower than a fixed rotation speed, so that the compressor operates at a rotation speed higher than a fixed rotation speed. When is continued for a certain time, the compressor is turned off.

Description of Embodiments An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 is an inside temperature detecting means for detecting the inside temperature, and 2 is a set temperature detecting means for detecting a set temperature. Reference numeral 3 denotes a defrost switch that detects when the temperature during cooling reaches a predetermined temperature or more during defrost and terminates the defrost. 4 is a control means composed of a microcomputer,
It has I ₁ , I ₂ , I ₃ , I ₄ , I ₅ , and output terminals O ₁ , O ₂ . Then, the inputs from the internal temperature detection means 1 and the set temperature detection means 2 are compared, and the rotation speed of the compressor 5 is determined according to the magnitude of the temperature difference between the two.

Reference numeral 6 is a rotation speed detection means for detecting the rotation speed of the compressor 5, and inputs the rotation speed of the compressor 5 to the input terminal I ₅ of the control means 4.

Reference numeral 7 denotes an operation control means, which is connected to the output terminal O ₁ of the control means 4 and receives the frequency determined by the control means 4,
It is, for example, a DC motor or the like that operates the compressor 5 at the rotation speed. Reference numeral 8 is a timer in which the number of revolutions detected by the revolution number detecting means 6 is higher than 0 and is equal to or less than a certain number of revolutions (hereinafter referred to as the minimum number of revolutions;
00 rotations. ) During operation, the output is sent after a certain time of operation. Defrosting start detection means 9 detects the amount of frost on the cooler and outputs an output when the amount of frost reaches a certain amount. 10 is a relay having a contact 10 ',
It is connected to the output terminal O ₁ of the control means 4. This relay 10 is turned on by the output of the output terminal O ₁ of the control means 4 when the output of the defrosting start detection means 9 is input from the input terminal I ₄ by the control means 4, and the heater 1 is energized. It is what starts the frost.

The operation will be described below with reference to FIG. FIG. 2 is a flowchart of the entire refrigerator in this embodiment.

In FIG. 2, in step 1, the inside temperature detected by the inside temperature detecting means 1 is input from the input terminal I ₁ . Next, in step 2, the set temperature detected by the set temperature detecting means 2 is input from the input terminal I ₂ . Then 3
In the step, the internal temperature input in the first step is compared with the set temperature input in the second step. In 4 steps, it is judged whether or not it is forcibly OFF, and if it is not forcibly OFF, the operation proceeds to 5 steps. In 5 steps, the rotational speed at which the compressor 5 operates is determined and output to the operation control means 7 from the output terminal O ₁ .

For example, as a general rule, the difference between the set temperature and the internal temperature is ± 1 ° C.
If it is (set temperature range), the compressor 5 is set to 1800
The compressor 5 is turned on at a rotation speed of less than the set temperature range, and the compressor 5 is turned off. If the internal temperature is higher than the set temperature range and higher than the set temperature by 5 ° C, the compressor 5 is rotated at 3600 rotations.
Is determined, and the rotation speed is determined so that the compressor 5 is driven at 5400 rotations when the above value is exceeded. At this time, the operation control means 6 operates the compressor 5 at the determined rotation speed.

Next, in 6 steps, it is judged whether or not the rotation speed detected by the rotation speed detecting means 6 is the minimum rotation speed. If it is the minimum rotation speed, the timer 8 is operated in 7 steps. Then 8 wherein said control means in said long timer 8 is determined whether reaches a set time set time 9 Step in Step 4 rpm than the output terminals O ₁ to the operation control means 7 = 0 the number of revolutions Then, the operation control means 7 turns off the compressor 5. And in 10 steps,
1 if it is not the set time to remember that it was forcibly turned off
Go to step 2.

Next, in step 11, the timer 8 is cleared. 6
Even if the number of revolutions is not the lowest in the step, the process proceeds to step 11. Next, in step 12, whether the defrosting start detection means 9 has output is fetched from the input terminal I ₄ of the control means 4, and if there is output, the operation proceeds to step 15; if there is no output, the operation returns to step 1.

Then, the process proceeds in the order of 1 step → 2 step → 3 step → 4 step, and in 4 steps, it is judged whether or not it is forced OFF. If it is forcibly turned off, it is judged in step 13 whether the difference between the internal temperature and the set temperature is 1 ° C. or more. If it is not 1 ° C. or more, the process returns to step 1 again.

When the temperature becomes 1 ° C. or higher, forced OFF is reset in 14 steps, and the rotation speed is output in 5 steps. In the 15th step, the control means 4 outputs the rotation speed = 0 rotation from the output terminal O ₁ to the operation control means 7, and outputs it from the output terminal O ₂ in the 16th step to turn on the relay 10 and turn on the heater 11. Energize to start defrosting.

Next, in step 17, the output of the defrosting end detection means 3 is input from the input terminal I _{3, and} it is determined whether or not there is an output of the defrosting end detection means 3. The operation is repeated, and if there is an output, the process proceeds to step 18, the relay 10 is turned off, the energization of the heater 11 is stopped, the defrosting is completed, and the process returns to step 1.

Therefore, by operating the timer 8 while the compressor 5 is operating at the minimum rotation speed, the compressor 5 can be turned off when the operation at the minimum rotation speed continues for a certain period of time, so It is possible to eliminate an obstacle to the operation due to insufficient oil supply to the sliding portion of the compressor 5 when operating at the rotational speed.

EFFECTS OF THE INVENTION As is clear from the above description, according to the present invention, the timer is operated when the output from the control means is at the minimum rotation speed, and the compressor is turned off when the operation of the compressor at the minimum rotation speed continues for a certain time. Since the operation control means for doing so is provided, it is possible to eliminate the trouble of operation due to insufficient oil supply to the sliding portion of the compressor during low-speed operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing operation control of the refrigerator of the present invention,
FIG. 2 is a flow chart, and FIG. 3 is an operation state diagram showing a conventional refrigerator control method based on the internal cold storage temperature. 1-internal temperature detecting means, 2-set temperature detecting means, 4
...... Control means, 7 ...... Operation control means, 8 ...... Timer.

Claims (1)

[Claims] Claim: What is claimed is: 1. An inside temperature detecting means for detecting the inside temperature,
A set temperature detecting means for detecting a set temperature of the inside temperature of the refrigerator, a control means for determining and outputting the number of revolutions of the compressor to be operated by inputs from the inside temperature detecting means and the set temperature detecting means, and the control means. The operation control means for operating the compressor at a rotation speed determined by the above, and a timer that operates at a rotation speed higher than 0 and at a fixed rotation speed or less. A refrigerator operation control device that controls to turn off the compressor when the operation continues for a certain period of time.