JP3504180B2 - Refrigerator food temperature measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a refrigerator.

[0002]

2. Description of the Related Art Foods have a large specific heat because they contain a large amount of water, and the temperature of foods does not change much with respect to the temperature of air in the refrigerator. Therefore, conventionally, in order to know the temperature of food, it is necessary to make it less susceptible to the change in air temperature.

As this method, firstly, there is a method in which the temperature sensing part of an alcohol thermometer is immersed in 100 cc of water in a container for a while at the center of the shelf in the middle of the refrigerating room. Secondly, there is a method in which a lump of brass having a specific heat equivalent to food is attached with a thermocouple for measurement.

However, most recent refrigerators are of a type in which the temperature inside the refrigerator is controlled by a microcomputer. In this case, a temperature sensor is arranged on the wall surface inside the refrigerator, and based on the temperature detected by this temperature sensor. The refrigeration cycle is controlled to keep the temperature of the food stored in the refrigerator constant.

[0005]

However, there is actually a difference between the temperature detected by such a temperature sensor and the temperature of the food stored in the refrigerator. That is, as shown in the graph of FIG. 6, even in the refrigerating room and the freezing room, there is a difference between the temperature detected by the temperature sensor (dashed line in FIG. 6) and the actual food temperature (dotted line in FIG. 6), It was hard to say that the temperature of food was measured accurately.

In view of the above problems, the present invention provides a food temperature measuring device for a refrigerator capable of accurately measuring the temperature of food.

[0007]

According to a first aspect of the present invention, there is provided a food temperature measuring device for a refrigerator, wherein the food temperature measuring device is attached to a cooling chamber in a refrigerator,
Of a refrigerator that has a temperature sensor that measures
In the food temperature measuring device, the temperature detected by the temperature sensor is
The time constant obtained from the heat load equivalent to food, and the
Calculated from the temperature difference between the position and the mounting position of the temperature sensor
The corrected temperature is corrected based on the corrected value
The time constant is displayed on the temperature display and the time constant
Changes the time constant when the door of the cooling chamber is in the open state and the time constant when the door of the cooling chamber is in the closed state.

A food temperature measuring device for a refrigerator according to claim 2 is
According to the first aspect of the present invention, the time constant when the door of the cooling chamber is open is further changed according to the temperature detected by the outside air temperature sensor.

A food temperature measuring device for a refrigerator according to claim 3 is
It is installed in the cooling room inside the cabinet and measures the temperature inside the cabinet.
Sensor and a food temperature measuring device for a refrigerator having a temperature display section
The temperature detected by the temperature sensor at the heat load equivalent to that of food.
Time constant calculated from the position of the food and temperature sensor
Based on the correction value obtained from the temperature difference due to the mounting position of
The temperature is displayed on the temperature display.
The time constant depending on the usage or operating condition of the refrigerator.
The time constant is made larger than that during normal operation during the defrosting operation and during a predetermined time after the completion of the defrosting operation.

The food temperature measuring device for a refrigerator according to claim 4 is
It is installed in the cooling room inside the cabinet and measures the temperature inside the cabinet.
Sensor and a food temperature measuring device for a refrigerator having a temperature display section
The temperature detected by the temperature sensor at the heat load equivalent to that of food.
Time constant calculated from the position of the food and temperature sensor
Based on the correction value obtained from the temperature difference due to the mounting position of
The temperature is displayed on the temperature display.
The time constant depending on the usage or operating condition of the refrigerator.
The time constant is made smaller than that during normal operation for a predetermined time after the power is turned on.

A food temperature measuring device for a refrigerator according to claim 5 is
It is installed in the cooling room inside the cabinet and measures the temperature inside the cabinet.
In the refrigerator food temperature measuring device with
The temperature detected by the sensor was calculated from the heat load equivalent to food.
The time constant, the position of the food and the mounting position of the temperature sensor
Compensation based on the compensation value obtained from the temperature difference due to
When the corrected temperature reaches the specified temperature, it will be notified.
The time constant depending on the usage or operating condition of the refrigerator.
The time constant when the door of the cooling chamber is open and the time constant when the door of the cooling chamber is closed are changed.

A food temperature measuring device for a refrigerator according to claim 6 is
According to a fifth aspect of the present invention, the time constant when the door of the cooling chamber is opened is further changed according to the temperature detected by the outside air temperature sensor.

A food temperature measuring device for a refrigerator according to claim 7 is
It is installed in the cooling room inside the cabinet and measures the temperature inside the cabinet.
In the refrigerator food temperature measuring device with
The temperature detected by the sensor was calculated from the heat load equivalent to food.
The time constant, the position of the food and the mounting position of the temperature sensor
Compensation based on the compensation value obtained from the temperature difference due to
When the corrected temperature reaches the specified temperature, it will be notified.
The time constant depending on the usage or operating condition of the refrigerator.
The time constant is made larger than that during normal operation during the defrosting operation and during a predetermined time after the completion of the defrosting operation.

A food temperature measuring device for a refrigerator according to claim 8 is:
It is installed in the cooling room inside the cabinet and measures the temperature inside the cabinet.
In the refrigerator food temperature measuring device with
The temperature detected by the sensor was calculated from the heat load equivalent to food.
The time constant, the position of the food and the mounting position of the temperature sensor
Compensation based on the compensation value obtained from the temperature difference due to
When the corrected temperature reaches the specified temperature, it will be notified.
The time constant depending on the usage or operating condition of the refrigerator.
The time constant is made smaller than that during normal operation for a predetermined time after the power is turned on.

A food temperature measuring device for a refrigerator according to claim 9 is
It is installed in the cooling room inside the cabinet and measures the temperature inside the cabinet.
In the refrigerator food temperature measuring device with
The temperature detected by the sensor was calculated from the heat load equivalent to food.
The time constant, the position of the food and the mounting position of the temperature sensor
Compensation based on the compensation value obtained from the temperature difference due to
When the corrected temperature reaches the specified temperature, it will be notified.
The current correction temperature is Y (t) and the past correction temperature is Y
(T-1), the time constant is α, the correction value is T, and the current detected temperature of the outside air temperature sensor is X (t), the correction temperature Y (t).
Y (t) = α · Y (t−1) + (1−α) · X (t) +
It is obtained from T.

According to a tenth aspect of the present invention, there is provided a food temperature measuring device for a refrigerator according to the ninth aspect, wherein the time constant α and the past correction temperature Y are used.
It has an operating means for inputting an initial temperature Y0 which is an initial value of (t-1).

The refrigerator of food temperature measuring device according to claim 11, in claim 9, the initial temperature Y0, it is to change the detected temperature X of the outside air temperature sensor (t).

A food temperature measuring device for a refrigerator according to claims 1 and 5 corrects a temperature detected by a temperature sensor based on a time constant and a correction value, and notifies when the corrected temperature reaches a predetermined temperature. Therefore, the temperature closer to the temperature of the food can be estimated and notified. Moreover, since the time constant is changed depending on the usage state or the operation state of the refrigerator, the temperature of the food can be estimated more accurately.
Further, when the door is open, the outside air flows into the refrigerator, so that the temperature inside the refrigerator fluctuates greatly, the error of the correction temperature increases, and the time constant does not match. Therefore,
When the door is open, change the time constant to match the actual situation. This makes it possible to more accurately estimate the temperature of the food.

Also in the food temperature measuring device for a refrigerator according to claims 2 and 6, the time constant is similarly changed according to the temperature detected by the outside air temperature sensor.

A food temperature measuring device for a refrigerator according to claims 3 and 7 will be described.

During the defrosting operation, the warm air during defrosting results in warming the temperature sensor. Therefore, since the food temperature is detected higher, the difference from the actual food temperature becomes large. Therefore, during the defrosting operation and during a predetermined time after the defrosting operation is completed, the time constant is reduced so that the actual temperature change of the food is satisfied. This makes it possible to more accurately estimate the temperature of the food.

A food temperature measuring device for a refrigerator according to claims 4 and 8 will be described.

When the power is turned on, for example, when a refrigerator is purchased, there is the largest difference between the temperature detected by the temperature sensor and the food temperature. Therefore, the time constant is reduced for a predetermined time after the power is turned on, and the value is close to the actual food temperature. This makes it possible to more accurately estimate the temperature of the food.

According to the food temperature measuring device of the refrigerator of claim 9 , the correction temperature Y (t) is calculated by Y (t) = α · Y (t-1) + (1-α) · X (t) +.
It is possible to accurately estimate the food temperature by obtaining the value from the formula of T 1 and displaying this value.

In the refrigerator food temperature measuring device according to the tenth aspect of the present invention, since the time constant α and the initial temperature Y0 are included in the operating means, it is possible to input the time constant and the initial temperature that match the actual conditions.

According to the temperature detecting device of the refrigerator of claim 11 , since the initial temperature Y0 is changed by the detected temperature X of the outside air temperature sensor, the food temperature in the initial state can be more accurately estimated.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION A refrigerator 10 according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of the refrigerator 10, FIG. 2 is a cross-sectional view as seen from the front, and FIG. 3 is a vertical cross-sectional view as seen from the side of the refrigerator 10, which also serves as an explanation of the electric system. is there. Further, FIG. 4 is an explanatory diagram of the refrigeration cycle of the refrigerator 10.

An outline of the refrigerator 10 will be described with reference to FIG.

The cabinet 12 of the refrigerator 10 includes a refrigerator compartment 14, a vegetable compartment 16, an ice making compartment 17, and a freezing compartment 18 from the top.
Is provided. Further, on the side of the ice making chamber 17, there is provided a switching chamber 19 capable of switching the set temperature inside the refrigerator via a partition wall.

On the door of the refrigerating compartment 14, a liquid crystal display section capable of displaying the temperatures of the refrigerating compartment 14, the switching compartment 19 and the freezing compartment 18, and a display operation panel 15 having operation buttons for operating the refrigerator 10. Are arranged.

The internal structure will be described with reference to FIG.

A machine room 22 in which a compressor 20 of a DC inverter is arranged is provided at the bottom of the rear surface of the freezing room 18. Further, a freezer compartment evaporator (hereinafter referred to as “F evaporator”) 24 is disposed behind the freezer compartment 18, and above the F evaporator 24, a refrigeration system that blows cold air generated in the F evaporator 24 to the freezer compartment 18. A room fan (hereinafter referred to as F fan) 26 is provided. Below the F evaporator 24, a defrost heater (hereinafter, referred to as F defrost heater) 28 for defrosting the F evaporator 24 is provided. In the vicinity of the upper part of the F-evaporator 24, an F-evaluator sensor 3 for detecting the temperature of the F-evaluator 24
0 is provided.

On the rear surface of the freezer compartment 18, a temperature sensor for the freezer compartment (hereinafter referred to as an F sensor) for measuring the temperature inside the refrigerator.
32 is provided.

On the back surface of the vegetable compartment 16, a refrigerator evaporator (hereinafter referred to as R evaporator) 34 is provided.
Above the 4 is a fan for the refrigeration room (hereinafter referred to as R fan)
36 is provided, and an R evaluation sensor 38 that detects the temperature of the R evaluation 34 is provided. Below the R Eva 34, R
A defrost heater (hereinafter, referred to as R defrost heater) 40 for defrosting the evaporator 34 is provided.

On the back surface of the refrigerating compartment 14, a temperature sensor for the refrigerating compartment (hereinafter referred to as R sensor) for measuring the temperature inside the refrigerator.
42 are provided.

On the ceiling surface of the cabinet 12, the refrigerator 1
An outside air temperature sensor 70 for measuring the temperature of the room in which 0 is placed is provided.

The outside air temperature sensor 70, the F fan 26,
F defrost heater 28, F evaporation sensor 30, F sensor 32,
The R fan 36, the R evaporation sensor 38, the R defrost heater 40, and the R sensor 42 are connected to a control device 44 including a microcomputer. Further, the control device 44 includes
The DC motor of the compressor 20 is also connected. The control device 44 is composed of one board and is used in the cabinet 1
It is provided on the upper part of the back surface of No. 2.

The flow of cold air will be described with reference to FIG.

The cold air cooled by the F evaporator 24 is F
The air is blown by the fan 26 and circulates in the freezer compartment 18.

The cold air cooled by the R evaporator 34 is R
The fan 36 blows air to the vegetable compartment 16 and the refrigerator compartment 14 for circulation.

The structure of these refrigeration cycles will be described with reference to FIG.

A condenser 46 is connected to the compressor 20, and a three-way valve 68 is connected to the condenser 46. One of the bifurcated refrigerant flow paths from the three-way valve 68 is connected to the R evaporator 34 via a refrigerating chamber capillary tube (hereinafter, referred to as R capillary tube) 50. Also,
The other refrigerant flow path separated from the three-way valve 68 is a freezer compartment capillary tube (hereinafter referred to as an F capillary tube).
It is connected to 52. Then, the refrigerant channels of the F capillary tube 52 and the R evaporation 34 become one, and the F evaporation 2
4 and further to the compressor 20.

The operating state of the refrigerator 10 will be described.

1. Alternate cooling operation (1) Refrigerating mode The three-way valve 68 is switched to allow the refrigerant to flow to the R and F eva 34 and 24. When the R fan 36 and the F fan 26 are operated, respectively, the cooled air is
It is sent to the refrigerator compartment 14, the vegetable compartment 16, and the freezer compartment 18, and these rooms are cooled. Hereinafter, this state is referred to as a refrigerating mode.

(2) Refrigerating mode The three-way valve 68 is switched so that the refrigerant flows only through the F capillary tube 52 and the F evaporator 24. And F
Only the fan 26 is operated. In this state, F Eva 2
The cold air cooled by 4 is sent only to the freezer compartment 18 by the F fan 26, and the internal temperature of the compartment decreases. And, cold air is not sent into the refrigerator compartment 14. Hereinafter, this state is referred to as a freezing mode.

(3) Alternate cooling operation The alternating refrigeration mode and the refrigeration mode are referred to as alternating cooling operation.

2. Defrosting Operation In the refrigerator 10, when performing the defrosting operation, the F-evaporator 24 and the R-evaporator 34 are simultaneously removed from the defrosting heater 2 from the structure of the refrigeration cycle shown in FIG.
There are cases where defrosting is performed by 8 and 40 and cases where only the F evaporator 24 is defrosted by the F defrosting heater 28.

3. Estimation of Food Temperature (Example 1) As shown in the related art, there is a difference between the temperature detected by the R sensor 42 and the food S1 stored in the refrigerator compartment 14. Similarly, the temperature detected by the F sensor 32 and the freezer compartment 18
There is also a difference with the food S2 stored in. Therefore, a method of estimating the food temperature will be described. The estimation is performed by the control device 44.

Since the refrigerator compartment 14 and the freezer compartment 18 have different internal temperatures but are handled in the same manner, only the refrigerator compartment 14 will be described and the freezer compartment 18 will not be described.

The calculation method is performed in two steps.

In the first step, the temperature detected by the R sensor 42 is multiplied by a time constant α corresponding to the specific heat of food.

The second step is the correction of the temperature difference due to the difference between the position of the R sensor 42 and the assumed position of the food (food S1 in FIG. 3). This is because, as a general rule, as shown in FIG. 3, the position of the R sensor 42 is arranged above the position where the temperature change is large, rather than below, so that the temperature control reaction is better.

Since the time response of heat is an exponential function, the temperature calculation result of the nth sample is Y (n) from the sampling data at constant time intervals, and the temperature detected by the R sensor 42 is X.
If (n) and the correction value according to the time constant α and the position of the R sensor 42 is T, the following approximation can be made.

Y (n) = α · Y (n−1) + (1−α) · X (n) + T (1) For example, when the sampling interval is 1 minute, α =
When 0.98 and T = 1.2, the state is close to the food temperature (state of the dotted line) as shown by the chain double-dashed line in FIG. This is closer to the sensor temperature in the conventional example.

Then, the corrected temperature Y estimated in this way
(N) is digitally displayed on the display operation panel 15.

Example 2 The correction temperature Y (n) in Example 1 described above is
Although the value is quite close to the food temperature, the distribution of the temperature inside the refrigerator is not always constant, and the temperature changes during cooling and during non-cooling. Further, during defrosting, the temperature change of the R sensor 42 or the F sensor 32 is different from the normal temperature, and tends to deviate from the calculation by the equation (1). Further, when the door is opened, unlike the cooling from the wall surface, warm outdoor air enters from the front, so that the approximation of the equation (1) is deviated.

Even if the difference between the actual food temperature and the corrected temperature finally settles to the same average value, it takes the form of delay or advance of the follow-up when the temperature is fluctuated depending on the use condition or operation condition of the refrigerator 10.

Therefore, in the second embodiment, a method of correcting the estimated temperature of the food product calculated by the equation (1) in consideration of the usage state or the operation state of the refrigerator 10 will be described.

Although a plurality of correction methods will be shown below, only one of these correction methods may be adopted, a plurality of them may be arbitrarily combined, and all of them may be adopted. Good.

(1) First correction method When the food temperature is estimated and calculated, the time constant is calculated by using a JIS gold ingot or a water equivalent of 100 cc, which is close to the change in the food temperature, or the thermoelectric conversion is applied to the actual food. A pair is inserted and calculation is performed based on actual measurement data.

The time constant also changes depending on the water content of food and the weight of the same food.

Therefore, the time constant corresponding to the type and amount of food is stored in the memory of the control device 44 in the control device 44, and when the user selects the food to be measured, the time constant corresponding to it is called from this memory. Then, the time constant is substituted into the equation (1) for calculation.

For example, as the type and amount of food to be stored in the refrigerating compartment 14, 1 canned beer, 3 canned beers, 5 canned beers, small watermelon, medium watermelon, large watermelon, beverage bottle 1
It is possible to select liter and wine, and to call the stored time constants corresponding to the kinds and amounts of these foods from the memory to calculate the formula (1).

Specifically, this is performed as follows.

FIG. 5 is an enlarged front view of the display / operation unit 15. This liquid crystal display unit 72 shows, from the left, the first display unit 74 showing the type of product selected in the refrigerating compartment 14 and the refrigerating compartment 14. A second display unit 76 showing the temperature inside the refrigerator, a third display unit showing the switching state of the switching chamber 19, a fourth display unit showing the selected product in the freezing chamber 18, and a fifth display showing the temperature inside the freezing chamber 18. It consists of a display section.

The first display section 74 and the fourth display section 80 perform dot matrix display, and the temperature display of the second display section and the fifth display section performs 7-segment display.

Below the liquid crystal display unit 72, the cold storage button 84, the food setting button 86 for setting food in the refrigerating compartment 14, the initial temperature after operating the temperature adjustment of the refrigerating compartment 14 or the food setting button 86. Refrigerator button 8 for selection
8, a switching room button 90 for switching the internal temperature of the switching room, a freezing room button 92 for performing operations after the operation of adjusting the temperature of the freezing room 18 and the food setting button, and setting the food stored in the freezing room 18 A food setting button 94, a quick freeze button 96, and a quick ice making button 98 are provided.

Then, the user of the refrigerator 10 selects the food to be stored by the food selection button 86.

With this operation, the food setting button 8
The time constant corresponding to the food (three canned beer) selected by 6 is called from the memory, and the equation (1) is calculated based on this time constant. Then, the calculated value is displayed as the food temperature on the second display unit 76.

The same applies to the freezer compartment 18.

By doing so, the food temperature can be displayed more accurately.

Immediately after selecting the time constant (food) as described above, the initial value of the food temperature in the equation (1) is required. The initial value in this case is confirmed by pressing the refrigerating room button 88. Then, when the refrigerating room button 88 is pressed, for example, the following items can be selected as the initial value of the food.

1) F temperature (when food is stored in the freezer compartment 18) 2) R temperature (when food is stored in the refrigerating compartment 14) 3) Temperature detected by an outside air temperature sensor (food is stored outside) 4) Temperature equivalent to a cold dark place (when food is stored in a cool dark place of 10 ° C to 20 ° C) 5) Temperature of heated food (4 when food is cold tea)
0 ℃, 30 ℃) 6) Frozen foods bought outside and whose temperature has risen slightly (-
10 ° C.) With this method, it is possible to determine whether or not the purchased food (frozen sashimi, frozen meat) has been thawed, in addition to whether or not the target food has cooled.

(2) Second correction method When the air in the refrigerating compartment 14 is circulated by the R fan 36 and when it is not circulated, the food is more likely to be cold and warmer when circulated.

Therefore, the time constant α is decreased when the air is circulated by the R fan 36, and the time constant α is increased when the R fan 36 is stopped (for example, α =
If 0.98, α = 0.99). This allows
The calculated value in equation (1) can be followed by the temperature change of the food.

Even in the freezer compartment 18, the F fan 2
The same can be done in the operation and stop condition of 6.

(3) Third Correction Method When the door 17 of the refrigerator compartment 16 is opened, the refrigerator compartment 14
Since the outside air flows into the inside, the fluctuation of the air temperature becomes large, and the error of the equation (1) becomes large, so that the time constant α cannot match.

Therefore, when the door 17 is opened, the time constant α is changed so as to match the actual condition. That is, when warm air flows in, the time constant α is increased (for example, if α = 0.98, α = 0.99).

Since it naturally depends on the outside air temperature, the accuracy is further improved by changing the time constant according to the temperature detected by the outside air temperature sensor 70. That is, the higher the temperature detected by the outside air temperature sensor 70, the larger the time constant α.

The same applies to the freezer compartment 18.

(4) Fourth Correction Method When the R defrost heater 40 is energized, the R evaporator 34 in the wall surface is warmed, the warm air is transmitted through the duct, and the R sensor 42 is easily warmed. However, during defrosting, the R fan 36 is stopped so that warm air does not flow into the refrigerating compartment 14, so that the temperature of the R sensor 42 rises more than usual. Also, the R defrost heater 40
For a few minutes after the power is turned on, the R fan 36 is not rotated and the warmed R
Since the control for cooling the evaporator 34 and the air around it is performed first, the temperature of the R sensor 42 remains elevated for a while even after defrosting, so the temperature calculated by the equation (1) tends to be high.

Therefore, by decreasing the time constant α during the defrosting operation and for several minutes after the defrosting operation is completed (for example, α
If α = 0.98, α = 0.97), so that the calculated value matches the actual temperature change of the food.

The same applies to the freezer compartment 18.

(5) Fifth Correction Method Immediately after the power is turned on, such as when the refrigerator 10 is purchased, (1)
There is no Y (n-1) data in the equation and some initial temperature is required. In this case, the temperature detected by the R sensor 42 when the power is introduced is usually used. However, immediately after purchase, the refrigerator 10 is not cold, but the food is cold, and the situation is varied such that the refrigerator compartment 14 is cooled to some extent before the food is put in.
Even when it gets cold, there will be a difference depending on the outside temperature. In such a case, the detected temperature of the R sensor 42 is most different from the calculated value, and at the same time, the user is most concerned about the cooling state of the food.

Therefore, in order to bring the actual temperature and the actual difference closer to the initial temperature as soon as possible after the power is turned on, the time constant is made small (for example, if α = 0.98, α = 0.9).
7). The predetermined time may be, for example, a case where the temperature detected by the R sensor 42 falls within a certain temperature range from the target temperature, or a case where the rate of change of the calculated temperature falls within a certain temperature range.

(6) Sixth correction method Since the influence when the outside air temperature is different affects the heat leak amount of the refrigerator 10, this influence also affects the temperature distribution inside the refrigerator.

Therefore, the position of the R sensor 42 and the food S1
The temperature difference from the position of becomes larger as the outside air temperature becomes higher.
Therefore, the correction value T may be changed based on the temperature detected by the outside air temperature sensor 70 to match the actual condition. That is, the correction value T (for example, T
= 1.2, T = 1.3).

(7) Modification Example In the above correction method, the calculated temperature is displayed on the operation unit 1.
However, instead of this, the user may be informed by an alarm means such as a lamp or an alarm buzzer when the designated product has an appropriate temperature or is thawed.

Further, only the alarm may be issued by the above-mentioned alarm means without displaying on the display operation unit 15.

In the first correction method, the initial temperature may not be selected by the user, and the temperature detected by the outside air temperature sensor 70 may be used as the initial temperature.

(8) Experimental Results The results obtained by performing all the first to sixth correction methods are the results of Example 2 (solid line) in FIG. As shown in this graph, the corrected temperature in Example 2 is closer to the food temperature (dotted line).

[0093]

As described above, with the food temperature measuring device of the present invention, the temperature of the food stored in the cooling chamber can be measured more accurately and easily.

[Brief description of drawings]

FIG. 1 is a front view of a refrigerator according to this embodiment.

FIG. 2 is a sectional view of the refrigerator according to the present embodiment as viewed from the front.

FIG. 3 is a cross-sectional view of the refrigerator according to the present embodiment viewed from the side.

FIG. 4 is an explanatory diagram of a refrigeration cycle.

FIG. 5 is an enlarged front view of the operation display unit.

FIG. 6 is a graph when Example 1 and Example 2 are carried out.

[Explanation of symbols]

10 refrigerator 15 Display operation unit 19 Switching room 20 compressor 24 F Eva 26 Fan for freezer 28 Defrost heater 30 F EVA sensor 32 F sensor 34 R Eva 38R EVA sensor 44 Control device 68 three-way valve 70 Outside temperature sensor 72 LCD display

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F25D 11/00 101 F25D 29/00

Claims (11)

(57) [Claims] 1. It is mounted in a cooling chamber inside a chamber to measure the temperature inside the chamber.
Refrigerator food with temperature sensor and temperature indicator
In the temperature measuring device, the temperature detected by the temperature sensor is calculated from the heat load equivalent to food.
Time constant, position of food and mounting position of temperature sensor
Corrected based on the correction value obtained from the temperature difference due to
Then, the corrected temperature is displayed on the temperature display, and the time constant is changed according to the usage condition or operating condition of the refrigerator.
Changed, and the time constant door of the cooling chamber is open, the refrigerator of the food temperature measuring apparatus and changes the time constant of the door of the cooling chamber is in the closed state. Wherein the time constant door of the cooling chamber is open, the refrigerator of the food temperature measuring device according to claim 1, wherein the further modified by detecting the temperature of the outside air temperature sensor. 3. It is attached to a cooling chamber inside the chamber to measure the temperature inside the chamber.
Refrigerator food with temperature sensor and temperature indicator
In the temperature measuring device, the temperature detected by the temperature sensor is calculated from the heat load equivalent to food.
Time constant, position of food and mounting position of temperature sensor
Corrected based on the correction value obtained from the temperature difference due to
Then, the corrected temperature is displayed on the temperature display, and the time constant is changed according to the usage condition or operating condition of the refrigerator.
Modified, during the defrosting operation and during defrosting operation ends after a predetermined time, a refrigerator, characterized in that larger than normal operation the time constant of the food temperature measuring device. 4. It is attached to a cooling chamber inside the chamber to measure the temperature inside the chamber.
Refrigerator food with temperature sensor and temperature indicator
In the temperature measuring device, the temperature detected by the temperature sensor is calculated from the heat load equivalent to food.
Time constant, position of food and mounting position of temperature sensor
Corrected based on the correction value obtained from the temperature difference due to
Then, the corrected temperature is displayed on the temperature display, and the time constant is changed according to the usage condition or operating condition of the refrigerator.
A food temperature measuring device for a refrigerator, which is changed and a time constant is made smaller than that during normal operation for a predetermined time after power-on. 5. It is attached to a cooling chamber inside the chamber to measure the temperature inside the chamber.
For food temperature measuring device of refrigerator having temperature sensor
The temperature detected by the temperature sensor is calculated from the heat load equivalent to food.
Time constant, position of food and mounting position of temperature sensor
Corrected based on the correction value obtained from the temperature difference due to
Then, when the corrected temperature reaches the specified temperature, it is reported.
Know the time constant, depending on the usage or operating condition of the refrigerator.
Changed, and the time constant door of the cooling chamber is open, the refrigerator of the food temperature measuring apparatus and changes the time constant of the door of the cooling chamber is in the closed state. 6. The food temperature measuring device for a refrigerator according to claim 5 , wherein the time constant when the door of the cooling chamber is open is further changed according to the temperature detected by the outside air temperature sensor. 7. It is attached to a cooling chamber inside the chamber to measure the temperature inside the chamber.
For food temperature measuring device of refrigerator having temperature sensor
The temperature detected by the temperature sensor is calculated from the heat load equivalent to food.
Time constant, position of food and mounting position of temperature sensor
Corrected based on the correction value obtained from the temperature difference due to
Then, when the corrected temperature reaches the specified temperature, it is reported.
Know the time constant, depending on the usage or operating condition of the refrigerator.
Modified, during the defrosting operation and during defrosting operation ends after a predetermined time, a refrigerator, characterized in that larger than normal operation the time constant of the food temperature measuring device. 8. It is attached to a cooling chamber inside the chamber to measure the temperature inside the chamber.
For food temperature measuring device of refrigerator having temperature sensor
The temperature detected by the temperature sensor is calculated from the heat load equivalent to food.
Time constant, position of food and mounting position of temperature sensor
Corrected based on the correction value obtained from the temperature difference due to
Then, when the corrected temperature reaches the specified temperature, it is reported.
Know the time constant, depending on the usage or operating condition of the refrigerator.
A food temperature measuring device for a refrigerator, which is changed and a time constant is made smaller than that during normal operation for a predetermined time after power-on. 9. It is attached to a cooling chamber inside the chamber to measure the temperature inside the chamber.
For food temperature measuring device of refrigerator having temperature sensor
The temperature detected by the temperature sensor is calculated from the heat load equivalent to food.
Time constant, position of food and mounting position of temperature sensor
Corrected based on the correction value obtained from the temperature difference due to
Then, when the corrected temperature reaches the specified temperature, it is reported.
The current correction temperature is Y (t) and the past correction temperature is Y (t-
1), the time constant is α, the correction value is T, and the current detected temperature of the outside air temperature sensor is X (t), the correction temperature Y (t) is Y (t) = α · Y (t-1) + (1-α) · X (t) +
A food temperature measuring device for a refrigerator characterized by being obtained from T. 10. A time constant α and a past correction temperature Y (t-
The food temperature measuring device for a refrigerator according to claim 9, further comprising operation means for inputting an initial temperature Y0 which is an initial value of 1). 11. The initial temperature Y0, claim and changes by detecting the temperature X of the outside air temperature sensor (t) 9
The refrigerator food temperature measuring device described.