JPS61101781A - Operation controller for 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;

Configuration of a conventional example and its problems A conventional refrigerator operation control device will be explained with reference to FIGS. 4 and 5.

Reference numeral 1 indicates an internal temperature detection means for detecting the internal temperature of the refrigerator, 2 indicates a set temperature detection means for detecting the set temperature, and 3 detects the amount of frost accumulated in the cooler, and issues a defrosting start signal when a predetermined amount of frost is reached. Output. The defrosting start detection means 4 detects the temperature of the cooler during defrosting.
3 is a defrosting end detection means that detects when the temperature reaches a predetermined temperature or higher and ends defrosting. 5 is a control means having input terminals Io, 11°I2. I3. It has output terminals 0° and 01. 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 according to the magnitude of both temperatures. For example, if the chamber temperature is less than the set temperature, It is decided to stop the Brefusa 6, to operate the compressor 6 at a high frequency when the temperature inside the refrigerator is greater than the set temperature, and to operate the compressor 6 at a low frequency when the temperature inside the refrigerator is the set temperature, and to change the output. It is output from terminal O0. Reference numeral 7 denotes an operation control means (hereinafter referred to as frequency III control means), which is, for example, a transistor inverter, which operates the compressor 6 at the frequency determined by the control means. 8 is a relay, contact 8' is 0N10FFL,
This is to turn the defrosting heater 9 on and off.

In this configuration, when the refrigerator is first turned on, the temperature inside the refrigerator is the same as the outside temperature.
The temperature inside the refrigerator becomes the set temperature, and the control means 5 uses the compressor 6
Decide to operate at high frequency. For this reason, the compressor is operated at a high frequency. FIG. 2 shows changes in the motor current of the compressor 6 at this time. That is, after a while after the power is turned on, as shown at point A in FIG.
The time T from the time to the peak of the semi-flow value varies depending on the outside temperature, the internal temperature, and the cooling system.

Therefore, a very large current flows at point A, and elements such as transistors that can withstand this current must be used in the operation control means 7, which is expensive.

Purpose of the Invention Therefore, the present invention lowers the current peak value after power-on,
A control device that reduces the cost of the operation control means by using elements such as transistors with a small capacity for use in the operation control means, and reduces the peak value of current even if the outside temperature, internal temperature, and cooling system change. The purpose is to provide

Structure of the Invention To achieve this object, the present invention detects the inlet temperature and outlet temperature of the cooler, and changes the operating frequency of the compressor when the temperature difference between the cooler inlet temperature and outlet temperature falls within a set value. In order to reduce the current peak value after power-on,
It is designed to be versatile with respect to changes in outside temperature, inside temperature, and cooling/stem.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. The internal temperature detection means 1, set temperature detection means 2, defrost start means 3, defrost end detection means 4, compressor 6, operation control means 7, relay 8, and heater 9 are the same as those of the conventional example. A detailed explanation will be omitted. 10 is an inlet temperature detection means for detecting the inlet temperature of the cooler and sending out an output;
Reference numeral 11 denotes an outlet temperature detection means for detecting the outlet temperature of the cooler and sending out an output. Reference numeral 12 denotes a control means, in addition to the configuration of the control means 6 shown in the conventional example, input terminals I4. I5 are connected to the outputs of the inlet temperature detection means 10 and the outlet temperature detection means 11, respectively, and in addition to the function of the control means 5 shown in the conventional example, input terminals I4. The operating frequency of the compressor is determined by the input from I5.

The operation will be explained below with reference to FIG.

In one step, the temperature inside the refrigerator detected by the temperature inside the refrigerator 1 is inputted from the input terminal IO.

Next, in two steps, the set temperature detected by the set temperature detection means 2 is inputted from the input terminal check 1. Next, in 3 steps, the internal temperature input in 1 step is compared with the set temperature input in 2 steps, and in 4 steps, the operating frequency of the compressor 6 is determined. In step 5, the inlet temperature of the cooler detected by the inlet temperature detection means 10 is input.

Next, at step 6, the outlet temperature of the cooler detected by the outlet temperature detection means 11 is detected, and at step 7, the inlet temperature input at step 5 and the outlet temperature detected at step 6 are compared. Next, in step 8, it is determined whether the temperature difference between the inlet temperature and the outlet temperature of the cooler is within the set value, and if it is within the set value, the process proceeds to step 9. If it is not within the set value, the process proceeds to step 11, and the frequency determined in step 4 is output to the operation control means 7. If the result of the judgment in 8 steps is to proceed to step 11, it is the first time the refrigerator is turned on, or the first time it starts operating after defrosting. Next, the process proceeds to step 12, and it is determined whether or not defrosting has started based on the output of the defrosting start detection means 3. If defrosting has started, the process proceeds to step 13;
Return to step. And the paddy JIJI when the power is turned on?
('In the initial stage of operation after the completion of IA, the above operation is repeated.Then, the compressor 6 is operated to perform cooling operation, and when the inlet temperature and outlet temperature of the cooler are within the set value, steps 8 to 9 are performed. Proceed to step.

In step 9, it is determined whether the temperature inside the refrigerator is low or not.

If the internal temperature is low, proceed to step 11; if the internal temperature is high, proceed to step 10. The reason for proceeding to step 11 is that stable operation is considered when the temperature difference between the inlet temperature and the outlet temperature is within the set value and the temperature inside the refrigerator is low.

In the 10th step, the control means 5 outputs the intermediate frequency to the operation control means 7, and the process continues in the 12th step. Proceed to step 12. If the start of defrosting is detected in step 12, the process proceeds to step 13. In 13 steps, the operating frequency of the compressor 6 is set to 0±(OFF), and the output terminals O0 to 7,
・The defrost signal is output from the output terminal 01 and the relay 8 is turned ON at 4.
, the heater 9 is energized to start defrosting.

Next, in step 15, a check is made to see if there is an output from the defrosting completion detection means 4, and if there is no output, the process returns to step 15 and the output of the defrosting completion detection means 4 is input again. If there is a low output, the process proceeds to step 16, turns off the heater 9, completes defrosting, and returns to step 1.

As shown in FIG. 3, when the refrigerator is powered on for the first time, there is initially a temperature difference between the inlet temperature and the outlet temperature of the cooler, and the temperature difference gradually disappears. Then, when the inlet temperature and the outlet temperature become the same, the point A (conventional is shown by a broken line), which is the peak value of the undercurrent, is shown in FIG. Therefore, the inlet and outlet temperatures of the cooler are the same,
If the temperature inside the refrigerator is high, the current will reach its peak value, so it is determined that the inlet temperature and outlet temperature are within the set value before this, and the operating frequency of the compressor 6 is operated at an intermediate frequency. When the temperature inside the refrigerator becomes low, the operating frequency is returned to the one determined by the temperature inside the refrigerator and the set temperature, so that the cooling performance is not significantly affected.

Therefore, by detecting the inlet temperature and outlet temperature of the cooler and operating the compressor 6 at an intermediate frequency when the temperature inside the refrigerator is high, the peak value of the current can be reduced.
Elements such as transistors used in the control means 7 can be made small in capacity, the configuration of the operation control means γ can be made inexpensive, and it can also be made resistant to changes in outside temperature, internal temperature, and cooling system. Electric current can be prevented and versatile control is possible.

Effects of the Invention As is clear from the above explanation, the present invention detects the inlet temperature and outlet temperature of the cooler, and detects when the temperature difference between the inlet temperature and the outlet temperature is within a set value and the temperature inside the refrigerator is high. The compressor is operated at an intermediate frequency, and if the temperature inside the refrigerator falls, it is operated at a frequency determined by the temperature inside the refrigerator and the set temperature, so the capacitance of elements such as transistors used for operation control means must be made small. It is famous because it can be used as an inexpensive operation control means.

Moreover, Qll 1m can be realized which is versatile even with changes in the outside temperature, the inside temperature, and the cooling system.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the refrigerator operation control device of the present invention, Fig. 2 is a flowchart of the same Fig. 1, and Fig. 3 shows the motor current when using the operation control device of the present invention. FIG. 4 is a diagram showing the configuration of a conventional refrigerator operation control device, and FIG. 6 is a diagram showing changes in motor current after power is turned on according to a conventional control method. 1...Inner c blackness detection means, 2...Setting temperature detection means, 6...Control means, 7...
Operation control means, 10...Inlet temperature detection means, 11
...Exit profit detection means. Name of agent: Patent attorney Toshio Nakao, I.Oka, or one person; Figure 3, page 2

Claims (1)

[Claims] an internal temperature detecting means for detecting the internal temperature of the refrigerator; a set temperature detecting means for detecting the preset temperature of the internal refrigerator; an inlet temperature detecting means for detecting the temperature at the inlet of a cooler attached to the refrigerator; The operating frequency of the compressor is determined based on inputs from the outlet temperature detection means for detecting the temperature at the outlet of the container, the chamber temperature detection means, the set temperature detection means, the inlet temperature detection means, and the outlet temperature detection means. comprising a control means and an operation control means for operating the compressor at an operating frequency determined by the control means,
When the input difference from the inlet temperature detection means and the outlet temperature detection means goes from above a predetermined value to within a predetermined value and the temperature inside the refrigerator is high, the temperature inside the refrigerator becomes lower than the predetermined value. A refrigerator operation control device that changes and controls the operating frequency of the compressor.