JPS60233477A - Controller for operation of refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an operation control device for a refrigerator.

Conventional configuration and its problems Conventionally, refrigerator control that changes the operating frequency of the compressor determines the operating frequency of the compressor based on the difference between the internal temperature of the refrigerator and the set temperature. If the temperature is high, run the compressor at high frequency;
When the internal temperature equals the set temperature, the compressor is operated at a low frequency, and when the internal temperature is equal to the set temperature, the compressor is turned off. For example, as shown in the table below, when the difference between the set temperature and the internal temperature is ±1°C (set temperature range), the compressor is operated at 30 Hz, and when the difference is below the set temperature range, the compressor is operated at 0FFI.

The compressor operates at 60Hz until the internal temperature is 6°C higher than the set temperature, and at 9oHz when it is higher than that.
The compressor is operated at

With this control method, the temperature inside the refrigerator is within the set temperature range.

When balanced, continuous operation is performed at 30 Hz, and as a result, the compressor rotates at a low speed, which tends to cause insufficient oil supply to its sliding parts, which has the disadvantage of interfering with operation.

However, the set temperature is 0°C.Purpose of the InventionThe present invention is intended to solve the problem of operational problems caused by insufficient oil supply to the sliding parts of the compressor.

Structure of the Invention To achieve this object, the present invention provides a first timer that operates at the lowest frequency of compressor operation determined by the control means at a frequency higher than OHz, and after expiration of this first timer, the high frequency By providing a second timer that stops the compressor after operation at low frequency, if the compressor continues to operate at low frequency for a certain period of time, the compressor is about to run out of oil, so it will run at high frequency once to eliminate the oil shortage. After this, the compressor is turned off to prevent an excessive shortage of oil during the next operation.

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

In FIG. 1, reference numeral 1 indicates an internal temperature detection means for detecting the internal temperature, and reference numeral 2 indicates a set temperature detection means for detecting a set temperature. Reference numeral 3 denotes a defrost switch that detects when the temperature of the cooler reaches a predetermined level during defrosting and ends defrosting. A control means consisting of a 4rli microcomputer,
Input terminal 11. I2゜Is, output terminals 01, 02 f
have. Then, the inputs from the chamber temperature detection means 1 and the set temperature detection means 2 are compared, and the operating frequency of the compressor 6 is determined depending on the magnitude of the temperature difference between the two.

6 is an operation control means connected to the output terminal 01 of the control means 4, and receiving the frequency determined by the control means 4,
For example, a transistor inverter operates the compressor 6 at that frequency. 7 is a first timer, which is determined by the control means 4 at a higher frequency than OH2. It operates during the time of the frequency (hereinafter referred to as the lowest frequency) and sends out an output after operating for a certain period of time. 8 is the second timer and the first
The output of the timer 7 is used for a certain period of time, and during this output, the compressor 6 is operated at high frequency by the operation control means. 9 is a defrosting start detection means that detects the amount of frost on the cooler and sends out an output when the amount of frost reaches a certain amount. 10 has a relay contact 1σ.

It is connected to the output terminal 01 of the control means 4.

When the control means 4 inputs the output from the defrosting start detection means 9 from the input terminal 4, this relay 10 is turned ON by the output of the output terminal 01 of the control means 4, and energizes the heater 11 to defrost. This is the start of the process.

The multiple operations will be explained below with reference to FIG. ! FIG. 2 is a 70-chart diagram of the entire refrigerator in this embodiment.

In FIG. 2, step 1 is the temperature detection means 1 in the refrigerator.
Input terminal for the detected internal temperature! Enter 1'. Next, in step 2, the set temperature detected by the set temperature detection means 2 is inputted from the input terminal I2. Next, in step 3, the internal temperature input in step 1 and the set temperature input in step 2 are compared, and in step 4, the operating frequency of the compressor 6 is determined, and the operating frequency of the compressor 6 is determined at the output terminal 01. Output to.

For example, as a general rule, the difference between the set temperature and the internal temperature is ±1°C.
If the temperature is within the set temperature range, the compressor is operated at 30Hz, and when the temperature is below the set temperature range, the compressor is turned off, and the frequency is 60Hz until the internal temperature is higher than the set temperature range and 6°C higher than the set temperature. The operating frequency is determined so that the compressor 6 is operated at a frequency of 90 Hz, and when the frequency is higher than that, the compressor 6 is operated at a frequency of 90 Hz.

At this time, the compressor 5 is operated at the frequency determined by the operation control means eFi.

Next, in step 6, it is determined whether the operating frequency determined and outputted by the control means 4 is the lowest frequency,
If the frequency is the lowest, in step 6, the first timer 7
make it work. Next, in step 7, it is determined whether the first timer 7 has reached the set time, and if it is the set time, then in step 8, the second timer 8 is activated. When the second timer 8 is activated in step 8, the compressor 6, which has been operating at the lowest frequency until now, is set to a high frequency and operated at step 9. That is, the compressor 5 was operated at aoHz, but now it is operated at a frequency of 60Hz, which is higher than the 5oHz. Then as step 1o this second step
The timer 8 determines whether or not the set time has elapsed, and if it is still within the set time, the operation is repeated by repeating steps 9 and 1o. Then, when it is determined in step 10 that the second timer 8 has reached the set time, in step 11, the control means 4 outputs the operating frequency OHZ to the output terminal 01 to the operation control means 6. 6 turns off the compressor 5. Next, in step 12, the first timer 7 and second timer 8 are cleared. Note that in step 5, if the frequency is not the lowest, the process proceeds to step 12. Next, in step 13, whether or not the defrosting start detection means 9 has output is received from the input terminal I4 of the control means 4, and if there is an output, the process proceeds to step 14;
If there is no output, return to step 1. Note that step 14
Then, the control means 4 outputs the operating frequency OHz from the output terminal 01 to the operation control means 6, and in step 15 outputs it from the output terminal 02, turning the relay 10 ON L,
The heater 11 is energized to start defrosting. Next, in step 16, the output of the defrosting end detection means 3 is input to the input terminal x3.
It is determined whether or not there is an output from the defrosting end detection means 3. If there is no output, the same operation is repeated in step 16. If there is an output, the process proceeds to step 17 and the relay 10 is turned OFF L and the heater is 11 is stopped, defrosting is completed, and the process returns to step 1.

Therefore, when the compressor 5 is operating at the lowest frequency, the first timer 7 can be operated, and then the second timer can be turned off after operating the compressor at a high frequency for 80 hours, and when operating at a frequency lower than the commercial frequency. It is possible to eliminate problems with operation caused by insufficient oil supply to the sliding parts of the compressor.

In addition, by returning from low frequency to high frequency and operating on the second timer for a certain period of time, the compressor will be completely refueled and stopped after insufficient refueling, so it will take more time before the next compressor operation. Even if this occurs, the compressor's drive unit is less likely to seize, allowing smooth operation.

Effects of the Invention As is clear from the above explanation, the present invention operates the first timer when the output from the control means is at the lowest frequency, and when the compressor continues to operate at the lowest frequency for a certain period of time, the second timer is activated. Since the timer turns off the compressor once after high-frequency operation, the compressor is stopped after resolving the lack of oil supply to the sliding parts of the compressor during low-frequency operation, thereby preventing seizure during the next compressor operation. This prevents the vehicle from becoming inoperable.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a refrigerator operation control device of the present invention, and FIG. 2 is a flowchart. 1... Inner temperature detection means, 2... Preset temperature detection means, 4... Control means, 6...
・Operation control means, 7... First bearer, 8...
...Second timer.

Claims (1)

[Claims] An internal temperature detection means for detecting the internal temperature, a set temperature detection means for detecting the set temperature of the internal temperature, and an operating frequency of the compressor based on the inputs from the internal temperature detection means and the set temperature detection means. a control means for determining and sending the compressor; A refrigerator operation control device comprising a first timer that operates, and a second timer that operates a compressor at a frequency ranging from the lowest frequency to a higher frequency for a certain period of time and then stops the compressor after the time set by the first timer expires.