JPS60144582A - 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] 21゛-go Industrial applications The present invention relates to an operation control device for a refrigerator.

Conventional configuration and its problems In the conventional operation control of a refrigerator that performs 0N10FF control of the compressor, if the compressor starts defrosting the cooler while it is running, the compressor operation is immediately stopped and started. Ta. This is because, as shown in Figure 1, when defrosting starts immediately after the compressor starts operating (17 hours), the temperature inside the refrigerator is usually lower than that of 0N10FF operation when defrosting is finished because the interior of the refrigerator is not sufficiently cooled as shown in the diagram. This has the disadvantage that the concentration increases, which adversely affects the preservation of food.

In order to avoid this, it is known that the compressor is forcibly operated for a certain period of time before the start of defrosting. However, since this is a forced operation at the commercial frequency of 601 or 60, the forced operation time is It must be long,
In addition, the temperature inside the refrigerator may not be cooled down to a desired temperature, and therefore the temperature may rise during defrosting.

Purpose of the Invention Therefore, an object of the present invention is to reliably cool the temperature inside the refrigerator to a desired temperature in a short period of time before defrosting. A defrost standby state is set, a timer is activated, and the variable speed compressor is operated at a commercial frequency or higher for a certain period of time during this period, and defrosting is then performed.The temperature inside the refrigerator is cooled down to the desired temperature reliably and in a short period of time. This eliminates the rise in internal temperature during defrosting and reduces the negative impact on food preservation.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.
In the figure, reference numeral 1 denotes an internal temperature detection means for detecting and transmitting the internal temperature of the refrigerator. 2 is a set temperature detection means that detects and sends out what temperature the inside temperature of the refrigerator is set to.
Reference numeral 3 denotes a defrosting end detection means that detects a rise in temperature of the cooler during defrosting and sends out an output when the temperature exceeds a set temperature.

4 is a control means and an input terminal I. 111112, and are connected to the internal temperature detection means 1, the set temperature detection means 2, and the defrosting end detection means 3, respectively. Also, the output terminal is 0°.

01. The output terminal Oo is connected to frequency control means 5, such as a transistor inverter, which outputs the operating frequency of the compressor 6. The frequency control means 5 operates the compressor 6 based on commands from the control means 4.

Further, the output o1 is connected to a relay 7 that is turned ON during defrosting to supply AC power to the heater 8, and is turned OFF during times other than defrosting. Reference numeral 9 denotes an integration timer that integrates the operating time of the compressor 6, and outputs an output when a set time is reached. A timer 1o starts operating after the integration timer 9 reaches a set time and outputs an output, and stops operating after operating for a certain period of time.

The operation of the above configuration will be explained below based on the flowchart of FIG.

In one step, the output of the chamber temperature detection means 1 is inputted to the input end check 0 of the 6-page control means 4. Next, in step 2, the output of the set temperature detection means 2 is inputted to the input terminal 11 of the control means 4. Next, in step 3, the internal temperature input in steps 1 and 2 is compared with the set temperature, and in step 4, the frequency determined by comparison is outputted to frequency control means 6 through output terminal O8. Then, the compressor 6 is operated at the frequency determined by the frequency control means 4.

The control means 4 outputs, for example, 90 Hz when the temperature inside the refrigerator is greater than the set temperature, 30 Hz when the temperature inside the refrigerator is less than the set temperature, and OHZ when the temperature inside the refrigerator is less than the set temperature. Assume that the compressor 6 is ONI. Next, in 6 steps, the compressor 6 is set to 0N.
75. If it is not ON, it returns to step 1, and if it is ON, it proceeds to step 6, and the integration timer 9 is activated. Next, in step 7, it is determined whether the integration timer 9 has reached the set time, and if it has not reached the set time, the process returns to step 1. This continues to cool the inside of the refrigerator. However, when the set time is reached, the process proceeds to step 8 and the integration timer 9 is cleared, and in step 9, the control means 4 outputs a frequency higher than the commercial frequency (the highest frequency in this embodiment) to the frequency control means 6, The frequency control means 6 operates the compressor 6 at the highest frequency. Then, in step 1o, the timer 1o is operated, and in step 11, it is determined whether the timer 1o has reached the set time. This timer time is set to a time that allows the temperature inside the refrigerator to be cooled to a desired temperature even when the load is the highest. If the timer 1o has not reached the set time in step 11, the process returns to step 9 and steps 9-1
Repeat the operations from step 0 to step 11. If 11
If the timer 10 has reached the set time in step 12, the process advances to step 12 and clears the timer 10.
In step 13, the control means 4 sends a signal to the frequency control means 6 to set the operating frequency to 01, and in response to this signal, the frequency control means 6 turns off the )57 Par-Z compressor 6. Next, in 14 steps,
The control means 4 outputs an output from the output terminal 01, turns on the relay 7, turns on the heater 8, and starts defrosting. Next, in step 16, the control means 4 takes in the output of the defrosting end detection means 3 from the input terminal (2), and if no output is sent out, it returns to step 13 and repeats the operations from step 13 to step 14 to step 15. If the output of the defrosting end detection means 3 is sent out repeatedly in the 15th step, the process proceeds to the 16th step and the control means 4 outputs the output terminal o.
1, the relay 7 is turned off, and the heater 8 is returned to the 0FFL1 step.

Therefore, since the compressor is operated at a commercial frequency or higher for a certain period of time before defrosting, the temperature inside the refrigerator can be cooled reliably and in a short period of time to the temperature required to prevent the temperature inside the refrigerator from rising during defrosting operation. Can be done.

Effects of the Invention As is clear from the above explanation, the present invention includes a control circuit that sets a defrost standby state before the start of defrosting, operates a timer, and operates the compressor at the highest frequency while the timer is operating. Therefore, it is possible to reliably cool the temperature inside the refrigerator to a desired temperature in a short period of time, eliminate the rise in temperature inside the refrigerator during defrosting, and reduce the adverse effect on food preservation.

[Brief explanation of the drawing]

FIG. 1 is a diagram of the internal temperature change curve of a conventional refrigerator operation control device, FIG. 2 is a block diagram showing an embodiment of the refrigerator operation control device of the present invention, and FIG. 3 is a detailed explanation of the present invention. This is a flowchart. 1... Internal temperature detection means, 2... Preset temperature detection means, 3... Defrosting end detection means, 4.
... control means, 6 ... frequency control means,
9... Integration timer, 1°... Timer.

Claims (1)

[Claims] An internal temperature detection means for detecting the internal temperature of the refrigerator, a set temperature □ detection means for detecting the set temperature, and a defrosting end detection means for detecting a temperature rise in the cooler and sending out an output to end defrosting. , a frequency control □ means for operating the compressor at a desired frequency, an integration timer for integrating the operating time of the compressor, a timer that operates for a certain period of time after the integration timer reaches a set time, and the temperature inside the refrigerator is detected. The operating frequency of the compressor is output to the frequency control means according to the output of the means and the set temperature detection means, and the operating frequency of the compressor is output to the frequency control means, and the output of the defrosting end detection means □ Control means for terminating defrosting, and operating the compressor at a commercial frequency frequency 1 while the timer is operating.