JP2002223955A - Heating cabinet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cabinet in which the temperature in a heat insulation room never becomes too high though the temperature in the heat insulation room droops temporarily. SOLUTION: This heating cabinet is provided with a control part 2 for controlling the outputs of heaters 6, 7, and 8 provided on wall surfaces 1a, 1b, 1c, and 1d in a heat insulation room 1, wall temperature sensors 15 and 16 for detecting the temperatures T3 and T4 of the wall surfaces in the room 1, and cabinet inside temperature sensors 17 and 18 for detecting the temperatures T1 and T2 in the room 1. The part 2 controls the outputs of the heaters 6, 7, and 8 based on the temperatures T3 and T4 of the wall surfaces in the room 1 and the temperatures T1 and T2 in the room 1. Thus, the temperatures T1 and T2 in the room 1 are controlled to be a set temperature T0 set previously by an operation part 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage cabinet used for storing cooked foods and the like in a warm room to keep the temperature.

[0002]

2. Description of the Related Art In this type of storage, for example, a heater is provided on a wall surface in a heat insulation room, and the heater is used to heat the heat insulation room. Temperature was detected. Then, the heater is controlled so that the detected temperature in the heat insulation room becomes a predetermined temperature.

In some of the above-mentioned storage cabinets, a circulation fan is provided in the insulation room, and the circulation fan circulates air in the storage room to make the temperature in the insulation room uniform.

[0004]

For example, when the door of the storage compartment is frequently opened and closed in order to store foods and the like in the storage compartment, the temperature in the thermal insulation room temporarily drops. in this case,
In the conventional storage room, even if the heater can recover the temperature in the heat insulation room immediately, the temperature of the heater is controlled to rise due to the temperature decrease in the heat insulation room. Temperature may be too high.

[0005] In the case where a circulation fan is provided in the heat insulation room, there is a problem in that the storage space for foods and the like in the heat insulation room becomes narrow. In addition, the ingredients cooked in the kitchen etc. are stored in the insulated room of the storage room, and in this state, the storage room is moved to the banquet room, etc., and the ingredients are taken out of the insulated room and distributed to the table in the banquet room. In some cases, it is necessary to maintain the temperature inside the heat insulation room even when moving foods in the storage room or distributing ingredients in the banquet hall.

[0006] It is an object of the present invention to provide a storage cabinet in which the temperature in the heat insulation room does not become too high even if the temperature in the heat insulation room temporarily drops. Another object of the present invention is to make it possible to make the temperature in the heat insulation chamber uniform without providing a circulation fan in the heat insulation room. It is another object of the present invention to be able to maintain the temperature in the heat insulation room even during the movement of the storage room.

[0007]

The temperatures T1 and T2 in the heat-retaining chamber 1 are controlled so that the temperature of the storage room to which the present invention is applied is set to a preset temperature T0 by the internal temperature setting means 20. You. In the present invention, the wall surface 1 in the heat insulation room 1 is provided.
a control means 2 for controlling the outputs of heaters 6, 7, 8 provided in a, 1b, 1c, 1d;
・ Wall temperature detecting means 15 and 16 for detecting T4 and thermal insulation room 1
Temperature detecting means 17 for detecting temperatures T1 and T2 in the chamber
18 is provided, and the control means 2 controls the outputs of the heaters 6, 7, and 8 based on the temperatures T3 and T4 of the wall surfaces in the heat retaining chamber 1 and the temperatures T1 and T2 in the heat retaining chamber 1. ,
The temperatures T1 and T2 in the heat insulation room 1 are controlled so as to become the set temperature T0. Here, the output of the heaters 6, 7, 8 is controlled by controlling on / off of the current to the heater 6, that is, by so-called switching control, or by controlling the amount of current to the heaters 6, 7, 8 by increasing or decreasing. Things etc. correspond.

More specifically, the upper heater 6 is arranged on the upper half wall in the heat insulation room 1 and the heat insulation room 1
The lower heaters 7 and 8 are arranged on the lower half wall surface of the lower heater.
The wall temperature detecting means 15 and 16 detect the temperature T3 of the upper half wall surface and the temperature T4 of the lower half wall surface, respectively. The control means 2 controls the output of the upper heater 6 based on the temperature T3 of the upper half wall surface and the temperatures T1 and T2 in the heat retaining chamber 1, while controlling the temperature T4 of the lower half wall surface and the heat retention. The outputs of the lower heaters 7 and 8 are controlled based on the temperatures T1 and T2 in the chamber 1. Of the front, rear, left and right side walls in the heat retaining room 1,
The upper half part of at least one side wall surface corresponds to the upper wall surface in the heat insulation room 1. The lower half side wall surface in the heat insulation room 1 corresponds to the lower half portion of at least one of the front, rear, left and right side wall surfaces in the heat insulation room 1, and also includes the bottom wall surface 1 d in the heat insulation room 1. .

The control means 2 controls the temperature T of the wall surface in the heat insulation room 1.
Control can be performed such that the output of the heaters 6, 7, 8 decreases as 3.T4 increases.
The control means 2 determines that the temperature in the heat insulation chamber 1 is equal to the set temperature T.
Control can be performed such that the output of the heaters 6, 7, 8 increases as the value becomes lower than 0.

The in-compartment temperature detecting means 17 and 18 are provided in the heat insulation room 1.
The temperature T1 of the upper part in the inside of the heat insulation chamber and the temperature T2 of the lower part in the heat insulation room 1 are respectively detected, and the control means 2 controls the temperature T1 of the upper part in the heat insulation room 1 and the temperature T2 of the lower part in the heat insulation room 1. The output of the heaters 6, 7, 8 can be controlled so that the temperature difference between the heaters 6, 7, and 8 is reduced. Heaters 6 and 7 here
Control of the output of 8 includes turning off the output of the upper heater 6 or reducing the output amount when the upper temperature T1 in the heat insulation room 1 is higher than the lower temperature T2, and controlling the heat insulation room 1 When the upper temperature T1 is lower than the lower temperature T2 by a predetermined temperature or more, control such as turning off the outputs of the lower heaters 7 and 8 or reducing the output amount corresponds to the above.

Further, a heat storage unit 9 heated by the heaters 6, 7, 8 can be provided so that the temperature in the heat retaining chamber 1 is maintained by the heated heat storage unit 9.

[0012]

According to the warming room of the present invention, the warming room 1
It is possible to prevent the temperature in the heat retaining chamber 1 from becoming too high while controlling the temperatures T1 and T2 in the chamber to become the set temperature T0. In other words, even if the temperature in the heat retaining room 1 is low, when the temperatures T3 and T4 of the wall surfaces in the heat retaining room 1 are high,
Since the temperature inside the heat retaining room 1 rises due to the heat of the wall surface inside the heat retaining room 1, if the output of the heaters 6, 7 and 8 is controlled only by the temperatures T 1 and T 2 inside the heat retaining room 1, Temperature is too high. In the present invention, the outputs of the heaters 6, 7, and 8 are controlled based on the temperatures T3 and T4 of the wall surfaces in the heat retaining room 1 and the temperatures T1 and T2 in the heat retaining room 1. Since the output of the heaters 6, 7, 8 can be controlled based on the temperatures T3, T4 of the wall surfaces in the chamber 1,
It is prevented that the temperature in the heat retaining room 1 becomes too high.
That is, the temperatures T1 and T2 in the heat insulation room 1 are controlled so as to appropriately reach the set temperature T0.

The output of the upper heater 6 is controlled based on the temperature T3 of the upper half wall surface and the temperatures T1 and T2 in the heat insulation chamber 1, while the temperature T4 of the lower half wall surface and the temperature in the heat insulation room 1 are controlled. When the outputs of the lower heaters 7 and 8 are controlled based on the temperatures T1 and T2, the temperatures of the upper portion and the lower portion in the heat retaining chamber 1 are uniformly controlled. In other words, the temperature of the high-temperature air tends to rise, so that a temperature difference is likely to occur between the upper part and the lower part in the heat retaining chamber 1,
By controlling the output of the upper heater 6 and the output of the lower heaters 7 and 8 independently of each other, it is possible to reduce the temperature difference between the upper part and the lower part in the heat insulation room 1 and to make the temperature inside the heat insulation room 1 uniform Can be. In addition, since the temperature inside the heat retaining chamber 1 can be made uniform without providing a circulation fan or the like, the storage space for foods and the like in the heat retaining chamber 1 can be widened by the amount without the circulation fan and the like. Further, it is possible to prevent the food from drying as much as there is no need to provide a circulation fan or the like.

As the temperatures T3 and T4 of the wall surface in the heat retaining chamber 1 increase, the outputs of the heaters 6, 7 and 8 are finely controlled so as to decrease, and the temperature in the heat retaining chamber 1 becomes higher than the set temperature T0. As heaters become lower,
If the control is finely controlled so as to increase the output of 8, the temperature in the heat retaining room 1 can be prevented from becoming too high, and the temperatures T1 and T2 in the heat retaining room 1 can be more appropriately set to the set temperature T0. Controlled.

The temperature T1 of the upper part in the heat insulating room 1 and the temperature of the heat insulating room 1
When the outputs of the heaters 6, 7, 8 are controlled so that the temperature difference from the temperature T2 in the lower part of the inside is reduced, the temperature in the heat retaining chamber 1 can be more reliably made uniform.

If the temperature in the heat retaining chamber 1 is maintained by the heat storage body 9 heated by the heaters 6, 7, 8, for example, when the heaters 6, 7, 8 are turned off and the refrigerator is moved. In such a case, the temperature in the heat insulation room 1 is maintained, and the food and the like in the heat insulation room 1 are reliably prevented from cooling down during the movement of the storage room.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 5 show an example of a refrigerator according to the present invention. As shown in FIG. 2, the storage compartment includes a heat insulation room 1 for keeping the food and the like after heating at a predetermined temperature, a control unit (control means) 2 for controlling the temperature in the heat insulation room 1, and the like. And four machine wheels 3 provided at four corners of the bottom surface, respectively.
Can be moved. The front of the thermal insulation room 1 (Fig. 2
The opening provided on the left side (in FIG. 2) can be swingably opened and closed by a door 5. The temperature in the heat insulation room 1 is, for example, 70 to 80 ° C.
Is set within the temperature range.

As shown in FIG. 3, the rear side wall surface 1a of the heat insulating chamber 1 is provided.
An upper heater 6 and a lower heater 7 are arranged vertically on left and right side walls 1b and 1c, respectively, and a bottom heater 8 as a lower heater is arranged on a bottom wall 1d of the heat retaining chamber 1. That is, the upper heater 6 is disposed on the upper half wall surface in the heat retaining chamber 1, and the lower heater 7 and the bottom heater 8 are disposed on the lower half wall surface in the heat retaining chamber 1. Then, the inside of the heat retaining chamber 1 is heated by these heaters 6, 7, and 8.

Further, as shown in FIG.
The heat storage bodies 9 are arranged so as to face 7.8. The heaters 6, 7, 8 and the heat storage body 9 are unitized by being covered by a panel 10 forming the inner surface of the heat retaining chamber 1 shown in FIG. The heat storage body 9 is for maintaining the temperature in the heat retaining chamber 1 even after the power supply to the heaters 6, 7, 8 is turned off in order to move the hot storage after heating by the heaters 6, 7, 8. is there. Note that heater 6
The heat storage body 9 is disposed so as to be closer to the heat insulation room 1 than to the storage areas 7 and 8.

As shown in FIG. 3, vertically extending shelf columns 12 are arranged near the four corners and the right side wall 1c in the heat retaining room 1, respectively. The loaded trays 13 (see FIG. 2) are held in a state of being arranged in a plurality of upper and lower stages via locking members (not shown). On the left side wall 1b side of the heat insulation room 1, the left side wall 1
b) two upper and lower wall temperature sensors (wall temperature detecting means) 15 and 16 for detecting the temperature of b;
And two internal temperature sensors (internal temperature detecting means) 17 and 18.

As shown in FIG. 5, each of the internal temperature sensors 17 and 18 is supported by a support 19 at a position away from the left side wall 1b, thereby keeping the temperature without being affected by the temperature of the left side wall 1b. The temperature in the chamber 1 can be detected. Then, the upper internal temperature sensor 17
Detects the upper temperature (upper internal temperature) T1 in the heat retaining room 1, and the lower internal temperature sensor 18 detects the lower temperature (lower internal temperature) T2 in the heat retaining room 1. It has become.

As shown in FIG. 5, each of the wall temperature sensors 15 and 16 is attached so as to come into contact with a shelf 12 disposed at the front end of the left wall 1b, and detects the temperature of the left wall 1b via the shelf 12. It is designed to detect. The upper wall temperature sensor 15 detects the upper half temperature (upper wall temperature) T3 of the left wall surface 1b, and the lower wall temperature sensor 16
Is the temperature of the lower half of the left side wall 1b (lower wall temperature) T4
Is to be detected.

The sensors 15, 16, 17, 18 and the heaters 6, 7, 8 are connected to the control unit 2 as shown in FIG. An operation unit (inside temperature setting means) 20 for setting the preset temperature (T0) in advance is connected. The operation unit 20 is also provided with a power switch and the like. The control unit 2 controls the outputs (heat generation amounts) of the heaters 6, 7, 8 based on the set temperature T0, the inside temperature T1, T2, and the wall surface temperature T3, T4, respectively. That is, the control unit 2 performs so-called switching control on the current to the heaters 6, 7, and 8. As the ON period becomes longer, the heater 6
・ The output of 7.8 increases.

More specifically, the control unit 2 includes a first map (Table 1) for setting the output of the heater 6 and a heater 7.
A storage unit 2a for storing various data such as a second map (Table 2) for setting the output of the heater 8;
Output setting means 2b for obtaining the output data of each of the heaters 6, 7, and 8;
It has an output control means 2c for controlling the outputs 7 and 8. The operation of obtaining the output data of the heaters 6, 7, 8 and controlling the outputs of the heaters 6, 7, 8 is continuously performed, for example, only while the power switch is on.

The output setting means 2b calculates the average value (average temperature in the refrigerator) T5 as the temperature of the heat-insulating chamber 1 from the upper and lower temperatures T1 and T2 in the heat-insulating chamber 1,
And output data of the heaters 6, 7, 8 with reference to the second map. For example, the inside temperature average value T5 is lower than the set temperature T0 by 3 ° C. [T5 = (T0−
3)] When the upper wall surface temperature T3 is 87 ° C., 40% is obtained as output data of the upper heater 6 from the first map shown in Table 1.

[0026]

[Table 1]

At this time, for example, the lower wall surface temperature T4 is 85 ° C.
In this case, 70% is obtained as output data of the lower heater 7 and the bottom heater 8 from the second map shown in Table 2. In addition, as mentioned above, the inside of the heat insulation room 1 is, for example, 70 to
It is set within a temperature range of 80 ° C.

[0028]

[Table 2]

If the output data of the upper heater 6 obtained by the output setting means 2b is, for example, 40%, the output control means 2c sets the ON period to 40 in the switching cycle of the current to the upper heater 6. %. The control unit 2 controls the upper heaters 6 on the rear wall surface 1a and the left and right side wall surfaces 1b and 1c of the heat retaining chamber 1 at the same time, and controls the lower heater 7 and the bottom heater 8 at the same time. In the first and second maps, for example, when the average temperature T5 in the refrigerator reaches the set temperature T0, the output data of the heaters 6, 7, 8 becomes 0%.
And the heaters 6, 7, 8 are turned off.

In the first and second maps, when the average in-chamber temperature T5 is equal, the outputs of the heaters 6, 7, 8 decrease as the wall temperatures T3, T4 increase. For example, if the average temperature T5 in the refrigerator is "the set temperature T
0-4 ° C.] [T5 <(T0-4
° C)], and as the wall surface temperatures T3 and T4 increase, "10
0% "," 70% "," 40% "," 0% "and heater 6
・ Output of 7 ・ 8 is small.

When the wall temperatures T3 and T4 are equal, the output of the heaters 6, 7, and 8 increases as the average temperature T5 in the refrigerator becomes lower than the set temperature T0. For example, when the wall surface temperatures T3 and T4 are “less than 81 ° C.”, “0%”, “20%”, “70%”, “100” as the in-chamber temperature average value T5 becomes lower than the set temperature T0.
% "And the outputs of the heaters 6, 7, 8 are large.

The control unit 2 determines that the average internal temperature T5 is, for example, 60 ° C. or more, and the upper internal temperature T1 is lower than the lower internal temperature T2.
If lower, the output of each upper heater 6 is turned off. In addition, when the lower internal temperature T2 is higher than the upper internal temperature T1 by, for example, 2 ° C. or more, the control unit 2 turns off the output of each of the lower heater 7 and the bottom heater 8. Further, the internal temperature average value T5 is, for example, the set temperature T0.
4 ° C. or more, and the lower wall surface temperature T4 is, for example, 81
If the temperature is not lower than ℃, the output of each upper heater 6 is turned off.

In the above description, the wall temperature sensors 15 and 16 and the inside temperature sensors 17 and 18 are connected to the left side wall 1b of the heat insulation room 1.
Side, but these sensors 15, 16, 17, 1
8 may be arranged on the right wall surface 1c side or the rear wall surface 1a side. Further, the upper heater 6 may be arranged on the upper wall surface of the heat retaining room 1.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control system of a refrigerator according to the present invention.

FIG. 2 is a longitudinal sectional view of a storage cabinet.

FIG. 3 is a front view showing the heat storage room of the storage cabinet.

FIG. 4 is a perspective view showing a heater and a heat storage element, and a panel and a cover that cover the heater and the heat storage element.

FIG. 5 is a front view showing an attached state of the wall temperature sensor and the inside temperature sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat insulation room 1a Rear wall surface 1b Left wall surface 1c Right wall surface 1d Bottom wall 2 Control part 6 Upper heater 7 Lower heater 8 Bottom heater 9 Heat storage body 15 Upper wall temperature sensor 16 Lower wall temperature sensor 17 Upper chamber temperature Sensor 18 Lower chamber temperature sensor

Claims (6)

[Claims] 1. A temperature control device for controlling temperatures T1 and T2 in a heat-retaining room 1 to a preset temperature T0 preset by a temperature-in-compartment temperature setting means 20. Control means 2 for controlling the output of heaters 6, 7, 8 provided in
Wall temperature detecting means 15 for detecting the temperatures T3 and T4 of the inner wall surface
・ 16, and internal temperature detecting means 17 ・ 18 for detecting the temperatures T1 ・ T2 in the heat retaining room 1 are provided. The control means 2 controls the temperature T3 ・ T4 of the wall surface inside the heat retaining room 1 and the temperature keeping room 1 Heaters 6, 7,.
8, the temperature T1 in the heat insulation room 1 is controlled.
-A refrigerator which is controlled so that T2 becomes the set temperature T0. 2. An upper heater 6 is disposed on an upper half wall surface in the heat retaining chamber 1, and lower heaters 7.8 are disposed on a lower half wall surface in the heat retaining chamber 1. 16 detects the temperature T3 of the upper half-side wall surface and the temperature T4 of the lower half-side wall surface, respectively, and the control means 2 controls the temperature T3 of the upper half-side wall surface and the temperature keeping room 1 While controlling the output of the upper heater 6 on the basis of the temperatures T1 and T2 in the inside, the lower heater 7 and the temperature of the lower heater 7 on the basis of the temperature T4 of the wall surface on the lower half side and the temperatures T1 and T2 in the heat insulation chamber 1 are controlled.
8. The storage according to claim 1, wherein the output of the storage is controlled. 3. The storage device according to claim 1, wherein the control means controls the output of the heaters to decrease as the temperatures T3 and T4 of the wall surface in the heat retaining chamber increase. Warehouse. 4. The controller 2 controls the heaters 6, 7,... As the temperature in the heat retaining chamber 1 becomes lower than a set temperature T0.
The storage according to claim 1, wherein the output is controlled to increase. 5. The internal temperature detecting means 17 and 18 include an upper temperature T1 in the heat insulation room 1 and a lower temperature T2 in the heat insulation room 1.
The control means 2 determines that the temperature difference between the upper temperature T1 in the heat retaining chamber 1 and the temperature T2 in the lower temperature inside the heat retaining chamber 1 becomes smaller.
5. The storage according to claim 1, wherein the output of the heaters 6, 7, 8 is controlled. 6. A heat storage unit 9 heated by heaters 6, 7, 8 is provided, and the heat storage unit 9 is heated by the heat storage unit 9.
4. The method according to claim 1, wherein the internal temperature is maintained.
Or the storage of 4 or 5.