JPS6051633B2 - Refrigerator temperature display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature display device for a refrigerator that informs a user of the temperature in a freezer compartment, refrigerator compartment, etc.

Conventionally, in this type of temperature display device, the air temperature in the freezer or refrigerator compartment is detected by a temperature sensor with a small heat capacity, and the detected temperature is converted into a temperature value by an arithmetic circuit and displayed with good followability. That's what I do.

However, such conventional devices generally only display the temperature inside the refrigerator as is, so they do not display the temperature inside the refrigerator depending on the loading and unloading of food, the opening and closing of the door, or the turning on and off of the compressor. Changes in the values are also displayed as they are. In other words, in the conventional device, the displayed temperature value constantly changes even when the internal temperature is within the appropriate temperature range, which may make the user feel suspicious of the displayed temperature, so it is difficult to provide a temperature display device itself. There was a risk that it would become meaningless. Therefore, an object of the present invention is to display the average detected temperature for a predetermined period when the temperature detected by the temperature sensor is within the appropriate temperature range of the refrigerator, so that the displayed temperature value does not change silently. To provide a temperature display device for a refrigerator, which can eliminate the possibility of giving a user a feeling of suspicion regarding the displayed temperature.

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

In Fig. 1, reference numeral 1 denotes the main body of a two-temperature refrigerator, inside which a freezer compartment 3 and a refrigerator compartment 4 are separated by a heat insulating partition wall 2, and the freezer compartment 3 is a box-shaped freezer compartment. A cooler 5 for the refrigerator compartment is formed, and a cooler 6 for the refrigerator compartment is disposed within the refrigerator compartment 4.

7 is a thermistor as a temperature sensor arranged in the freezing compartment 3 to detect its temperature; 8 is a thermistor also as a temperature sensor arranged in the refrigerator compartment 4 to detect its temperature; 9 is a refrigeration unit The door 10 is for the room 3 and the door 10 is the door for the refrigerator room 4.

Incidentally, each of the thermistors 7 and 8 is set to have a relatively small heat capacity. Reference numeral 11 denotes a display mechanism section erected at the front of the upper surface of the refrigerator body 1. On the front side of this section, a digital numeric display 12 made of light emitting diodes and a changeover switch 13 are arranged as shown in FIG.

Further, 14 is a compressor. Now, FIG. 3 shows the electrical configuration of the present invention.

That is, +■Cc is the output terminal of a DC constant voltage source (not shown), and between this and the ground, a series circuit of the thermistor 7 and the standard resistor 15 and a series circuit of the thermistor 8 and the standard resistor 1 are connected.
Connect the series circuit with 6. Therefore, from point a in the figure, the partial voltage corresponding to the resistance value of the thermistor 7 (that is, the temperature inside the freezer compartment 3 detected by the thermistor 7) becomes the temperature information signal S.
From point b in the figure, the resistance value of the thermistor 8 (that is, the temperature inside the refrigerator compartment 4 detected by the thermistor 8) is output as 1.
A divided voltage corresponding to the temperature information signal S2 is output as the temperature information signal S2. Further, the above point a is the contact c1 of the changeover switch 13.
-a1, the voltage comparator circuit 1 in the arithmetic processing circuit 17
The point b is connected to the input terminal N of the voltage comparison circuit 18 through the contacts C1 and b1 of the changeover switch 13. Then, the select terminal SL of the voltage comparator circuit 18 is connected to the ground via the contact C2-■ of the changeover switch 13. Now, the voltage comparison circuit 18 includes, for example, a window comparator, an analog switch, etc.
It has the functions described below. That is, between the contacts C1 and a1 of the changeover switch 13, C
2-A2 is turned on, in other words, when the temperature information signal S1 is input to the input terminal N and the select terminal SL is open, the detected temperature T1 corresponding to the input temperature 4 degree information signal S1 is within the appropriate temperature range of the freezer compartment 3 (for example, -18°C≦T1≦-15°C), the temperature information signal S1 is output from the output terminal PA, and the detected temperature T
1 is outside the appropriate temperature range of the freezer compartment 3 (T1 <-18℃, T1
>-15° C.), the temperature information signal S1 is output from the output terminal PB. In addition, the contact C1 of the changeover switch 13
When the temperature information signal S2 is input to the input terminal N and the select terminal SL is grounded, the detected temperature corresponds to the input temperature information signal S2. When T2 is within the appropriate temperature range of the refrigerator compartment 4 (for example, 0°C × T2≦10°C), the temperature information signal S2 is outputted from the output terminal PA, and the detected temperature T2 is within the appropriate temperature range of the refrigerator compartment 4. Outside (T2≦0℃, T2>
10°C), the temperature information signal S2 is output to the terminal P.
Output from B. On the other hand, in the arithmetic processing circuit 17, 1
9 and 20 are output terminals PA and PI of the voltage comparison circuit 18, respectively.
These A-D converters receive outputs from 3 to 7, and these convert the input temperature information signals Sl and S2 into digital signals sequentially at a predetermined sampling period. In particular, the signals digitized by the A-D converter 19 are , are once sequentially stored in the memory register 21.

Then, the signal stored in the memory register 21 is read out by a predetermined number of successive samplings by the output of the clock pulse generator 22 which is initialized at a predetermined period, and is inputted to the averaging circuit 23, where it is input to the averaging circuit 23. Averaged.
Therefore, the averaging circuit 23 outputs a digital signal obtained by averaging the temperature information signals Sl and S2 over a predetermined period. 24 is a ROM (read only memory) which inputs the digital signal from the A-D converter 20 or the digital signal from the averaging circuit 23 as an address value, and stores temperature value information stored in advance in the address group. Read out.

It goes without saying that the temperature value information is obtained by quantizing the temperature values corresponding to the detected temperatures Tl and T2 corresponding to the temperature information signals Sl and S2. 25 is a display drive circuit that receives the output from the ROM 24, which decodes the numerical value corresponding to the input temperature value information and displays it on the digital numeric display 1.
Display on 2.

Next, the operation of the above configuration will be explained with reference to FIG. 4 as well.

In FIG. 4, the temperature changes over time in the freezer compartment 3 and refrigerator compartment 4 are shown by solid lines A and B, respectively, and the temperature changes in the freezer compartment 3 and refrigerator compartment 4 indicated by the digital numeric display 12 are shown by solid lines A and B, respectively. The temporal changes in temperature are shown by broken lines C and D, respectively. If you want to know the temperature inside the freezer compartment 3 now, press the selector switch 13
The temperature information signal S1 corresponding to the temperature T1 in the freezer compartment 3 detected by the thermistor 7 is turned on between the contacts c1 and a1 and between C2 and A2, and the temperature information signal S1 is sent to the voltage comparator circuit 18 via the contacts c1 and a1. so that it is input to input terminal N. and,
The detected temperature T1 is the appropriate temperature range FG (fourth
(see figure), the temperature information signal S1 is applied from the output terminal PA to the A-D converter 19, where it is digitized at a predetermined sampling period, and further passed through the memory register 21 and the averaging circuit 23. As a result, a digital signal obtained by averaging the temperature information signal S1 for a predetermined period is RO.
Given to M24. Then, temperature value information corresponding to the digital signal is read from the ROM 24, and the display drive circuit 25 displays on the digital numeric display 12 a numerical value corresponding to the temperature value information read as described above. That is,
When the inside of the freezing compartment 3 is within the appropriate temperature range FG, the average value for a predetermined period is displayed as the temperature inside the freezing compartment 3, and therefore, the temperature inside the freezing compartment 3 changes as shown in FIG. 4 by turning on and off the compressor 14. Even if the temperature changes as shown by the solid line A, the temperature displayed by the digital number display 12 remains constant.
On the other hand, the temperature inside the freezer compartment 3 rises when dishes are stored in the freezer compartment 3 or the door 9 is left open for a relatively long time, so that the temperature T1 detected by the thermistor 7 becomes higher than that of the freezer compartment 3. When the temperature rises to outside the appropriate temperature range FG, the voltage comparator circuit 18
A temperature information signal S1 input to the temperature information signal S1 is applied from its output terminal PB to the A-D converter 20, digitized at a predetermined sampling period, and then applied to the ROM 24. Therefore, the temperature value information corresponding to the digital signal is read out from the ROM 24 at a cycle that matches the sampling cycle of the A-D converter 20, and the numerical value corresponding to the temperature value information thus read out is read out as a digital signal. It is displayed on the numeric display 12. That is, when the inside of the freezing compartment 3 is outside the appropriate temperature range FG, the temperature inside the freezing compartment 3 is displayed as is. On the other hand, when you want to know the temperature inside the refrigerator compartment 4, turn on the contacts C1-F and C2-■ of the changeover switch 13,
Thus, the temperature information signal S2 corresponding to the temperature T2 in the refrigerator compartment 4 detected by the thermistor 8 is inputted to the input terminal N of the voltage comparison circuit 18 via the contacts C1 and b1. Then, the detected temperature T1 falls within the appropriate temperature range RG of the refrigerator compartment 4.
(See Figure 4), when the temperature information signal S2
is given to the A-D converter 19 from the output terminal PA, so that the average value for a predetermined period of time is displayed on the digital numeric display 12 as the temperature inside the refrigerator compartment 4, as described above. Therefore,
When the inside of the refrigerator compartment 4 is within the appropriate temperature range RG, even if the temperature inside the refrigerator compartment 4 changes as shown by the solid line B in FIG. 4, the temperature displayed by the digital number display 12 remains constant. On the other hand, when the temperature inside the refrigerator compartment 4 increases or decreases and the temperature T2 detected by the thermistor 8 rises or decreases outside the appropriate temperature range RG of the refrigerator compartment 4, the temperature information input to the voltage comparison circuit 18 The signal S2 is at its output terminal P
Since the temperature inside the refrigerator compartment 4 is given from B to the A-D converter 20, the temperature inside the refrigerator compartment 4 is displayed as is on the digital numeric display 12 as described above. In addition, as a method of determining the average temperature in the appropriate temperature ranges FG and RG, it is also possible to differentiate the temperature information signals Sl and S2 and take the average between the points in time when the signs of the differential coefficients are reversed.

According to the present invention, as is clear from the above explanation, the temperature detected by the temperature sensor is at an appropriate temperature for the refrigerator. When the temperature is within the temperature range, the average detected temperature for a predetermined period is displayed so that the displayed temperature value does not change silently, thereby eliminating the possibility of giving the user a sense of suspicion regarding the displayed temperature. It is possible to provide a temperature display device for a refrigerator that can display the temperature of a refrigerator.

[Brief explanation of the drawing]

The drawings relate to one embodiment of the present invention, in which Fig. 1 is a schematic longitudinal side view of the refrigerator, Fig. 2 is a front view of the display, and Fig. 3 is a schematic longitudinal side view of the refrigerator.
The figure shows the electrical configuration, and FIG. 4 and FIG. 7 show the state of temperature change inside the refrigerator.

Claims (1)

[Claims] 1. A temperature sensor installed to detect the temperature inside the refrigerator and output a temperature information signal according to the detected temperature, and whose heat capacity is set to a small value, and a temperature sensor that converts the temperature information signal into a temperature value and displays it on a display. and an arithmetic processing circuit for displaying the information, the arithmetic processing circuit converts the temperature information signal for a predetermined period into an averaged temperature value when the temperature detected by the temperature sensor is within the appropriate temperature range of the refrigerator. A temperature display device for a refrigerator, comprising: