JP2988194B2 - Refrigerator door open / close detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator door open / close detector.

[0002]

2. Description of the Related Art FIG. 1 relates to a conventional door opening / closing detecting device disclosed in Japanese Utility Model Laid-Open Publication No. 1-126273, for example.
In the figure, 1 is a refrigerator box, 6 is a refrigerator control unit, 3 is inside the packing when the door packing 8 attached to the door 2 is in a closed state, and is installed so that an optical signal can be reflected on the door packing 8 and received. The door open / close detection device 7 is a compressor that is turned on / off by the control unit 6 based on the characteristics of the thermistor 11. Reference numeral 5 denotes a fan motor that is turned on / off by the control unit 6 based on the characteristics of the thermistor 11 and the state of the door switch 3, and reference numeral 4 denotes a light emitted from a light emitting unit 3 a of the door switch 3, for example, a light emitting diode, and reflected on the door packing 8. This is an interior lamp that is turned off by the control unit when an optical signal is received by, for example, the light receiving unit 3b including a phototransistor.

A conventional door opening / closing detecting device is configured as described above. When the door is opened / closed, it is turned on at a period of, for example, 20 Hz transmitted from the light emitting section 3a as shown in FIGS.
The optical signal to be turned off is reflected by the packing 8 and received by the light receiving unit 3b. Therefore, only when it is determined that the transmitted optical signal cycle is equal to the received optical signal cycle, the control unit 6 regards the door as closed and turns off the interior light 4. When the door is opened, the light signal transmitted from the light emitting unit 3a is transmitted to the light receiving unit 3b as shown in FIGS.
And the outside brightness is received. Therefore, the refrigerator outside when the brightness is determined is dark and the control unit as it is necessary to light the interior light, i.e., FIG. 13 (a conventional example in interior light operation) medium T _c ~T _d · T _e ~T in _f or the like, interior light 4 is turned, when it is determined that not dark, i.e. 14 in the (conventional interior lamp operation) was _{T d ~T e · T f ~T} g etc., interior light 4 Is turned off.

[0004]

In the conventional door opening / closing detecting device as described above, when the door is closed, minute gaps generated when food in the refrigerator hits the door, and the packing itself deteriorates or deforms. As a result, even if the door is closed, it is not possible to detect such a small gap as would occur even if the door is closed, resulting in poor cooling due to cold air leakage or excessive frost formation on the cooler.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a door opening / closing detecting device capable of detecting a small gap between a door packing portion and a contact portion of a box. It is intended to be.

[0006]

According to the present invention, there is provided a door opening / closing detecting device for a refrigerator, comprising: a door opening / closing detecting device provided with detecting means for detecting whether the door is opened or closed. Calculating frost amount calculating means, and determining means for determining whether the calculated frost amount is greater than a stored past frost amount by a predetermined amount or more, and when the determination by the determining means is large, It is provided with a detecting means for detecting that there is a minute gap between the door packing portion and the contact portion between the refrigerator box. Further, the frost amount calculation means calculates the amount of frost on the cooler using a conversion function from the operation rate of the compressor, the temperature of the refrigerant pipe entering the cooler and the temperature of the refrigerant pipe exiting the cooler. Means for calculating using a conversion function from the temperature difference with the means, means for calculating using a conversion function from the temperature hunting width of the room where the cooler is installed, and at least means for calculating using a conversion function from the defrost time One or more. Further, when the judgment by the judgment means is large, the defrosting interval is shortened.

[0007]

The refrigerator door open / close detection device according to the present invention determines whether or not the frost amount calculated by the frost amount calculation means is larger than a stored past frost amount by a predetermined amount or more. It is provided with a detecting means for detecting that there is a minute gap between the door packing portion and the contact portion between the refrigerator box.

[0008]

【Example】

Embodiment 1 FIG. Hereinafter, an embodiment of the present invention will be described.
1 and 2, 1 is a refrigerator box, 2 is a door, and 7 is ON / O by the refrigerator control unit 6 based on the characteristics of the thermistor 11.
This is a compressor to be flipped. 5 is a control unit 6 based on the characteristics of the thermistor 11 and the state of the door open / close detection device 10 according to the present invention.
The motor 4 is turned ON / OFF by the switch 4. When the door 10 detects that the door packing 8 and the box are in close contact with each other,
It is an interior light which is turned off by the light. 12 is the cooler 1
6 is a cooler room thermistor that detects the end of defrosting performed by using the defrost heater 13 to remove frost formed on 6. 14 is an inlet thermistor for measuring the temperature of the refrigerant pipe entering the cooler 16, and 15 is an outlet thermistor for measuring the temperature of the refrigerant pipe exiting the cooler 16.

Next, the operation will be described with reference to FIGS. First, a program for calculating the amount of frost will be described with reference to FIG. In S1, it is determined whether or not defrosting is being performed.
In the case of O, it is determined whether or not the defrosting is completed in S2, and in the case of NO, the normal operation mode is calculated, and in the case of YES, the defrosting operation end mode is calculated. In normal operation mode, for example, the current than the average operating rate U _m of the compressor of S3 in susceptible last 24 hours of the variation due to the door opening and closing of a user frost formation amount g _m using the conversion function shown in FIG. 5 , S4
Is calculated. Further, for example, the average temperature difference between the inlet T _Ri and the outlet T _Rd of the cooler of S5 for about 24 hours (T _Rd −
From T _Ri ), the current amount of frost is calculated in S6 using a conversion function as shown in FIG. FIG. 7 shows the average temperature hunting width T _FX -T _Fn of the cooler installation room calculated in S7.
Is calculated in S8 using a conversion function such as In the defrosting operation end mode, the time T required for the defrosting in S9 is calculated.
_S is calculated from S using a conversion function as shown in FIG. 4, and from S11, for example, the operation rate U _{e for} 6 hours before defrosting in FIG.
S12 is calculated using a conversion function such as The frost formation amount may be determined by any combination of the above methods, for example, three frost formation amounts g _m calculated in the normal operation mode as shown in FIG.
, G _R, and g _F are averaged values as in S13 and are used as the current frost amount g _now, and 2 calculated at the end of defrosting in S14.
The correction coefficient _Ag is calculated using the average values g _FIN and S 15 of the two frost amounts g _s and g _e . If it is determined in step S16 that the current frost amount g _now is larger than the maximum frost amount g _max predicted in the design stage, it is displayed in step S17 that abnormal frost is formed. Note for abnormality judgment may be subject to comparison by calculating the maximum frost quantity g _max from frost amount calculated in the past of a certain period. If it is smaller than g _max, S
For example, 11 of the average frost amount g _ave calculated from 19
The magnitude of 0% and g _now is determined. If it is determined in S18 that it is large (YES), in S20, there is much drainage.
An indication that there is a gap in the door is displayed. In the case of the opposite determination (NO), for example, a moving average value is calculated in S19, and g _ave
Update. For example, the refrigerator door open / close detection device of the present invention calculates the amount of frost from the operation rate, the temperature difference between the coolers, the temperature hunting width of the cooling chamber, and the like, and at each defrost, the amount of frost calculated from the defrost time. In comparison, it can be determined from the cumulative operation time of the compressor whether it is excessive. In the above embodiment, the abnormality notification means of S17 and S20 is displayed, but a buzzer or blinking of the interior light may be used. In particular, there is an effect that a buzzer sounds when the door is opened and closed, that is, when a person is near the refrigerator. In addition,
The display in S20 blinks the interior light when the door is opened and closed. The display of S19 may be a method that combines a plurality of means such as a buzzer.

Embodiment 2 FIG. Further, in the first embodiment, when it is determined that there is an abnormality, only the display is performed. However, not only the display but also the display is performed as shown in the flowchart of FIG. 10 and the defrost interval (compressor integrated operation time) is set in S21. , S22, it is possible to prevent the refrigerator from being cooled down by the normal control during the abnormal frosting operation as shown in FIG. With the above configuration, by detecting excessive frost formation, the clearance between the packing and the box can be detected.

[0011]

According to the present invention, when an object is caught between the door packing part and the refrigerator box, or by detecting the excessive frost of the cooler due to the contact with food with the door opening / closing detecting device, it is possible to detect the cold air from the door. And cooling failure due to excessive frost on the cooler. In addition, the user is notified that there is a gap between the door packing part and the refrigerator box, and can notify the user of the fact.

Since defrosting is performed before cooling failure due to excessive frost formation, problems such as cooling failure due to excessive frost formation can be prevented.

[Brief description of the drawings]

FIG. 1 is a connection diagram related to refrigerator control of the present invention.

FIG. 2 is a block diagram according to an embodiment of the present invention.

FIG. 3 is an operation flowchart of the embodiment of the present invention.

FIG. 4 is a function graph of the embodiment of the present invention.

FIG. 5 is a function graph of the embodiment of the present invention.

FIG. 6 is a function graph of the embodiment of the present invention.

FIG. 7 is a function graph of the embodiment of the present invention.

FIG. 8 is an operation flowchart of the embodiment of the present invention.

FIG. 9 is an efficiency diagram of the embodiment of the present invention.

FIG. 10 is a flowchart of another embodiment of the present invention.

FIG. 11 is a block diagram according to a conventional example.

FIG. 12 is an enlarged view of a main part of a conventional example.

FIG. 13 is an enlarged view of a main part of a conventional example.

FIG. 14 is a timing chart of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator box 2 Door 3 Door opening / closing detection device 4 Interior light 5 Fan motor 6 Control part 7 Compressor 8 Door packing 10 Door opening / closing detection device 11 Freezer compartment thermistor 12 Cooler room thermistor 13 Defrost heater 14 Cooler entrance thermistor 15 Cooler outlet thermistor 16 Cooler 17 Buzzer

Claims (3)

(57) [Claims] A door provided with a detecting means for detecting whether the door is opened or closed;
In the opening / closing detection device, a frost amount calculating means for calculating the amount of frost formed on the cooler of the refrigerator, and the calculated amount of frost is a predetermined amount or more than the stored frost amount in the past. Determining means for determining whether the value is large.
The contact between the door packing and the refrigerator box
It is characterized by having detection means to detect that there is a gap
A refrigerator door opening / closing detecting device provided with notifying means for notifying when there is the gap . 2. A frost quantity calculating means, means for calculating using the conversion function from the operation ratio of the compressor frost amount to the cooler, cooling
The temperature of the refrigerant pipe entering the heat exchanger and the refrigerant exiting the cooler
Means for calculating using a conversion function from the temperature difference with the temperature of the pipe, means for calculating using the conversion function from the temperature hunting width of the room in which the cooler is installed, and calculation using the conversion function from the defrost time 2. The refrigerator door open / close detection device according to claim 1, wherein the device is at least one of the means. 3. The defrosting interval is shortened when the judgment of the judging means is large.
A door open / close detection device for a refrigerator as described in the above.