JPS6078264A - 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 2 pages The present invention relates to operation control of a refrigerator.

Conventional configuration and its problems Conventionally, in the operation control of a refrigerator that performs 0N10FF control of the compressor, if defrosting starts while the compressor is in operation, the operation of the compressor is immediately stopped and defrosting begins. Met. This is because, as shown in Figure 1, when defrosting starts immediately after the compressor starts operating (time T'), the temperature inside the refrigerator is usually 0N because the interior of the refrigerator is not sufficiently cooled.
This has the disadvantage that the temperature increases compared to when operating at 10FF, which adversely affects the preservation of food. In order to avoid this, it is known to forcibly operate the compressor for a certain period of time using a timer before the start of defrosting. however,
Since this is a forced operation for a fixed period of time, it has the disadvantage that depending on the outside temperature and load conditions, the inside of the refrigerator may be cooled too much or the temperature may not reach the desired temperature.

Purpose of the Invention Therefore, the present invention promptly cools the temperature inside the refrigerator to a desired temperature before defrosting, eliminates the negative effects of food preservation, and immediately starts defrosting when the temperature inside the refrigerator reaches the desired temperature. The purpose is to eliminate excessive cooling.

Structure of the Invention In order to achieve this object, the present invention sets a defrosting standby state before the start of deregistration, and during this period, the variable speed compressor is operated at the highest frequency to cool the inside temperature to the desired temperature. By performing post-defrosting, the interior of the refrigerator is quickly cooled before defrosting, thereby eliminating an increase in temperature inside the refrigerator during defrosting and eliminating unnecessary cooling.

Description of examples An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 2, reference numeral 1 denotes an internal temperature detection means for detecting and transmitting the internal temperature of the refrigerator. Reference numeral 2 denotes 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 temperature rise in the cooler during defrosting and sends out a force when the temperature exceeds a set temperature. 4 is a defrost detection circuit, which is composed of resistors R1 and R2 and a photocoupler PH1. This defrost detection circuit 4 is attached to the cooler, and the output level of the output A decreases as the amount of frost increases, as shown in FIG. 6, 6 is comparator X
, comparator Y, and comparator X5 is set to the defrost detection level shown in FIG. 3, and sends out an output when the output of the defrost detection circuit 4 becomes below the defrost detection level. As shown in FIG. 3, the comparator Y6 is set to a defrost start level lower than the defrost detection level, and outputs an output when the defrost detection circuit 4 becomes below the defrost start level. 7 is a control means having input terminals Io, 11°I2. I3. I4, and are connected to the outputs of the internal temperature detection means 1, the set temperature detection means 2, the defrosting end detection means 3, the comparator 5, and the comparator 6, respectively. It also has output terminals 00 and 01. Output 0
0 is connected to a frequency control means 8, such as a transistor inverter, which outputs the operating frequency of the compressor 9, and the frequency control means 8 operates the compressor 9 based on a command from the stage 7 of the controller 6. Further, the output 01 is connected to a relay 10 that is turned ON during defrosting, supplies AC power to the heater 11, and is turned OFF during times other than defrosting.

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

In one step, the output of the internal temperature detection means 1 is input to the input terminal Io of the control means 7. Next, in step 2, the output of the set temperature detection means 2 is connected to the input terminal of the controller 7.
Enter 1. Next, in 3 steps, 1 step,
The internal temperature input in step 2 and the set temperature are compared, and in step 4, the frequency determined by comparison is outputted to the frequency control means 8 from the output terminal oO. The compressor 9 is then operated at the frequency determined by the frequency control means 8. Next, in step 6, the output of the comparator If no frost is detected, the process returns to step 1 and repeats the above loop, and if it is detected that defrosting is required for 6 pages, the process proceeds to step 6 and outputs the highest frequency to the frequency control means 8 from the output terminal OO. However, the frequency control means 8 operates the compressor 9 at the maximum rotation speed at the maximum frequency. Next, in step 7, the output of the chamber temperature detection means 1 is transferred to the input terminal of the control means 7.
Input from 0 and in step 8, it is determined whether the internal temperature shown in FIG. 6 has reached the set value. This set value is lower than the temperature inside the refrigerator, and is set at a level that prevents the temperature inside the refrigerator from rising during defrosting. At this time, if the temperature inside the refrigerator is above the set value, the process proceeds to step 9, where the output of the comparator Y6 is inputted from the input terminal check 4 of the control means 7, and the output A of the defrosting detection circuit 4 reaches the defrosting start level. It is determined whether the defrosting start level has been reached, and if the defrosting start level has not been reached, the process proceeds to step 6 and repeats the loop of step 6 → step 7 → step 8 → step 9 → step 6. If the defrosting start level has been reached, proceed to step 10. This defrosting start level is
It is set to a lower output level than the defrost detection level, and is a level at which the capacity of the cooler decreases when the output falls below the defrost start level. Therefore, even if the temperature inside the refrigerator has not reached the set value, if the output A of the defrosting detection circuit 4 reaches the defrosting start level, the cooling capacity will be reduced, so defrosting is started.

Next, in step 10, the control means 7 sends an OHz output to the frequency control means 8, and the frequency control means 8 turns off the compressor 9. Then, in step 11, an output is output from the output terminal 01 of the control means 7 to the relay 1o, the relay 1o is turned on, and the heater 9 is turned on to start defrosting.

Next, in step 12, the output of the defrosting end detection means 3 is inputted to the input terminal I2 of the control means 7, and it is determined whether the defrosting end signal is being sent out. If it is being sent out, step 1o→11 The loop of step → 12 steps is repeated, and if the defrosting end signal has been sent, the output of the output terminal 01 of the control means 7 is stopped in step 13, the relay 10 is turned off, and the heater 11 is returned to OFFFL1 step. be.

Therefore, after the compressor operates at the highest frequency, it enters defrosting.
78264 (3), the temperature inside the refrigerator is sufficiently cooled and defrosting is performed after the temperature inside the refrigerator reaches the desired low temperature, which prevents the temperature inside the refrigerator from rising due to defrosting and prevents precooling from supercooling or cooling. It can be done in a short time without any shortage.

Effects of the Invention As is clear from the above explanation, the present invention operates the compressor at the highest frequency when defrosting starts.
Since it is equipped with a control circuit that performs defrosting after the temperature inside the refrigerator has cooled to the desired temperature, the temperature inside the refrigerator is quickly cooled to the desired temperature 1, and preliminary cooling can be carried out in a short period of time without too much or too little. , it is possible to prevent the internal temperature from rising due to defrosting and reduce the negative effects of food preservation.

[Brief explanation of the drawing]

FIG. 1 is a conventional graph of internal temperature changes, and FIG. 2 is a block diagram showing an example of the refrigerator operation control device of the present invention.
FIG. 3 is a diagram showing changes in the output of the defrosting detection circuit in FIG. 2, FIG. 4 is a flowchart explaining the operation of the present invention, and FIG. 6 is a diagram showing changes in temperature inside the refrigerator according to the present invention. 9 Page... Internal temperature detection means, 2... Setting temperature detection means, 3... Defrosting end detection means, 4...
... Defrost detection circuit, 7 ... Control means, 8.
...Frequency control means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3: O frost amount (Ce) Figure 4

Claims (1)

[Claims] An internal temperature detection means for detecting the temperature inside the refrigerator, a set temperature detection means for detecting the set temperature inside the refrigerator, and a defrosting detection circuit that detects the amount of frost in the cooler and changes the output according to the amount of frost. ,
A removal completion detection means detects a temperature rise in the cooler and sends an output to end defrosting, a frequency control means operates the compressor at a desired frequency, the chamber temperature detection means, the set temperature detection means, and the removal A frost detection circuit and a control means for sending an operating frequency to the frequency control means and starting defrosting according to the input of the defrosting end detection means, and a control means for starting defrosting, A refrigerator operation control device that operates the compressor at a high frequency and starts defrosting based on the defrost detection output.