JPH03260579A - Refrigerator - Google Patents

Abstract

PURPOSE:To preserve frozen foods without damaging the foods at the start of operation or when warm food is placed in a refrigerator, by detecting a temperature gradient of a temperature detecting means, and lowering values of set temperature data when the temperature gradient is steep. CONSTITUTION:Input data from a temperature detecting means 8 is taken in, and the input value is stored in Told. A timer is started, and upon timer runout, input data from the temperature detecting means 8 is again taken in, and the input value is stored in Tnew. The difference between Tnew and Told is detected, and when the difference is not less than a set value, it is judged that the temperature gradient is steep. When Tnew (input temperature data) is higher than the set temperature data, a signal is outputted from a controlling means 13 so as to turn ON a compressor 9. When Tnew is lower than the set temperature data, on the other hand, a signal for turning OFF the compressor 9 is outputted from the controlling means 13.

Description

[Detailed description of the invention] Industrial applications The present invention relates to operational control for refrigerators.

BACKGROUND OF THE INVENTION In recent years, models using microcomputers have become mainstream for controlling the operation of refrigerators.

Conventionally, this type of operation control was carried out by Kenko Denki Sangyo.
The configuration shown in the NR-D35A refrigerator released in April 2010 was common. Below is the fourth section about its structure.
The explanation will be made according to FIGS. 6 to 6.

Reference numeral 1 denotes a refrigerator main body, which is a forced draft type refrigerator in which air cooled by a cooler 4 housed in a cooling chamber 3 configured within a partition wall 2 is circulated by a blower 6 to a freezing chamber 6 and a refrigerating chamber 7. Reference numeral 8 denotes an internal temperature detecting means comprising a thermistor or the like that detects the temperature of the freezer compartment 6 and sends an operation control signal to the compressor 9. A damper thermostat 10 is provided at the entrance of the refrigerator compartment 7 to adjust the amount of cold air inflow.

Next, the control circuit will be explained. Reference numeral 11 denotes a control means composed of a microcomputer or the like, and an internal temperature detection means 8 is connected to its input terminal. A drive means 12 for moving the compressor 9 is connected to the output terminal.

The operation of this configuration will be explained with reference to FIG. 4.

First, in step 200, input data from the refrigerator temperature detection means 8 is fetched. Next, in step 201, input temperature data is compared with preset temperature data. If the Nutev 201 determines that the input temperature data is high, the process advances to step 202 and the compressor 9 is turned off.
The control means 11 outputs the signal to N. Also step 20
If it is determined that the input temperature data is low in step 1, step 2
03, the control means 11 outputs an output to turn off the compressor 9. Drive means 1 based on the output of control means 11
2 operates or stops the compressor 9. Thereafter, the above operations are repeated to maintain the temperatures in the freezer compartment 6 and refrigerator compartment 7 at appropriate levels.

Problems to be Solved by the Invention However, in such a configuration, if operation is started with the freezer compartment 6 not sufficiently cooled (installation takes place at a later time or when the power is restored after a power outage), or if warm food is frozen during operation, When the frozen food is placed in the chamber 6, etc., due to the difference in heat capacity between the frozen food and the temperature detection means 8, the multi-temperature detection means 8 is cooled down faster than the set temperature data, and the compressor 9 is stopped. cormorant. Therefore, there are problems in that it takes time for the frozen food to be sufficiently frozen, the food is easily damaged, and it is not suitable for storage.

The present invention solves the above-mentioned problems, and aims to preserve frozen foods without damaging them at the start of operation or when warm foods are added.

Means for Solving the Problems In order to solve the above problems, the refrigerator of the present invention is configured to detect the temperature gradient of the temperature detection means and lower the value of the set temperature data when the temperature gradient is steep. It is something.

Effect: With the above-described configuration, when the cooling action starts when the freezer compartment is not sufficiently cooled, the lower slope of the temperature detection means becomes steep, and the set temperature data is set to a lower value than normal. Unfortunately, the operating time of the compressor becomes longer. Therefore, the cooling time of the frozen food is increased, the food is cooled quickly, and the food can be stored without being damaged.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3. In addition, the same reference numerals are attached to the conventional and restricted configurations,
A detailed explanation thereof will be omitted and only different parts will be described.

Reference numeral 13 is a control means such as a microcomputer and has an internal timer for counting time.

The operation of this configuration will be explained with reference to FIG. 1. In step 10o, input data from the temperature detection means 8 is taken and its value is set to T. Store in ld. Next step 1
The timer is started at step 01, and at step 102 the timer waits at 1 for time-up, and when the time-up is reached, the process proceeds to step 103. In step 103, the input data from the temperature detection means 8 is read again and its value is stored in "new". In step 104, it is written as "new". The difference in ld is detected, and if the value is greater than or equal to the set value, it is determined that the slope is steeper as the temperature decreases, and the process proceeds to step 106. Also, step 10
If the value is less than the set value in step 4, the process advances to step 106. Step 1
In both steps 05 and 106, the "new temperature" and the set temperature data are compared, but the set temperature data (To) in step 105 and the set temperature data (T1) in step 106 have a relationship of To T1. , step 10
6 is compared at a lower temperature. If Tn9W (input temperature data) is higher than the set temperature data in step 105 and step 106, step 1
07, the control means 13 outputs an output to turn on the compressor 9. Conversely, if it is low, the process proceeds to step 108 and the control means 13 outputs an output to turn off the compressor 9.

Therefore, if the temperature gradient is steep when comparing old temperature data and new temperature data during the cooling process, it is likely that the inside of the freezer compartment 6 is not cooled sufficiently or that warm food has been placed in the freezer compartment 6. Can be determined and compressor 9 is turned off
By lowering the set temperature, the cooling effect can be extended,
Frozen foods freeze quickly.

As described above, according to the refrigerator of the present invention, the degree of heat load in the freezer compartment can be detected based on the gradient of temperature drop, and when the gradient is steep, the state of heat load is heavy. Turn off the machine
You can lower the set temperature and extend the cooling time. Therefore, by bringing the frozen food to a low temperature quickly, it is possible to prevent the frozen food from going bad.

[Brief explanation of drawings]

Fig. 1 is a flowchart of a refrigerator showing an embodiment of the present invention, Fig. 2 is a control circuit diagram of the same refrigerator, Fig. 3 is a sectional view of the same refrigerator, and Fig. 4 is a flowchart of a refrigerator showing a conventional example. FIG. 6 is a control circuit diagram of the refrigerator, and FIG. 6 is a sectional view of the refrigerator. 1... Refrigerator, 6... Freezer, 7...
...Refrigerating room, 8...Temperature detection means, 9...
. . . Compressor, 13 . . . Control means.

Claims (1)

[Claims] It consists of a freezing compartment, a refrigeration compartment, and a temperature detection means for detecting the temperature of the freezing compartment and stopping the operation of the compressor of the refrigeration cycle, and a gradient of change in the temperature of the freezing compartment detected by the temperature detection means. A refrigerator comprising: a control means for storing the stored data, and changing the temperature at which the compressor is stopped based on the stored data.