JPH08129423A - Heating cabinet - Google Patents

Abstract

PURPOSE: To provide a heating cabinet which can eliminate the harmful effects due to a humidifier pan heating device and can ensure the smooth temperature control. CONSTITUTION: The heating cabinet is provided with a humidifier pan 22 which humidifies the inside of a storeroom 8, a humidifying heater 42 which heats the pan 22, a temperature sensor which detects the inside temperature of the storeroom 8, a humidity sensor which detects the inside humidity of the storeroom 8, and a controller which keeps the inside temperature of the storeroom 8 at its set level by controlling a heater 14 based on the output of the temperature sensor and also keeps the inside humidity of the storeroom 8 at its set level by controlling the heater 42 based on the output of the humidity sensor. If the inside temperature of the storeroom 8 rises up to a prescribed level while the output of the heater 42 is stopped, the controller controls the heater 42 based on the output of the temperature sensor to keep the inside temperature of the storeroom 8 at its set level regardless of the output of the humidity sensor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator for thawing frozen foods such as frozen bento boxes and frozen hamburgers, heating them, and keeping them warm.

[0002]

2. Description of the Related Art Conventionally, this type of refrigerator has been disclosed in, for example, Japanese Patent Laid-Open No.
As disclosed in Japanese Laid-Open Patent Publication No. 307417 (G05D23 / 19), a heating heater is provided in the storage and the heating heater is controlled based on the internal temperature of the storage to heat the interior of the storage to a predetermined temperature, and at the same time, to receive the saucer and the saucer. A humidifier composed of a humidifying heater for heating is provided, and the humidifying heater is controlled based on the humidity in the refrigerator to maintain the inside of the refrigerator at a predetermined humidity.

[0003]

However, since the heat generated by the humidifying heater also affects the inside of the refrigerator, the heating of the heater is stopped when the temperature inside the refrigerator is low and the humidity is high. Nevertheless, there is a problem that the temperature inside the refrigerator becomes abnormally higher than the set value due to the heat generated by the humidifying heater. Further, when the temperature inside the refrigerator rises due to the heat generated by the humidifying heater, the humidity relatively decreases, so that the amount of heat generated by the humidifying heater increases and a vicious cycle occurs in which the temperature inside the refrigerator further increases.

The present invention has been made in order to solve the above-mentioned conventional technical problems, and provides a warming cabinet capable of smoothly controlling the temperature by eliminating the adverse effect of the humidifying dish heating device. The purpose is to

[0005]

A heating cabinet according to the present invention comprises a heating chamber for heating a storage chamber by a heating device, and a heating tray for humidifying the storage chamber and the heating tray. Humidification dish heating device, a temperature sensor for detecting the temperature in the storage chamber, a humidity sensor for detecting the humidity in the storage chamber, by controlling the heating device based on the output of the temperature sensor,
A controller for maintaining the temperature in the storage room at a set value and controlling the humidifying tray heating device based on the output of the humidity sensor to maintain the humidity in the storage room at the set value. When the temperature inside the storage chamber rises to a predetermined value while the output of the heating device is stopped,
Regardless of the output of the humidity sensor, the humidifying dish heating device is controlled based on the output of the temperature sensor to maintain the temperature in the storage chamber at the set value.

[0006]

According to the warming cabinet of the present invention, when the temperature in the storage chamber becomes higher than the set value and the temperature rises even when the output of the heating device is stopped, the temperature in the storage chamber becomes a predetermined value. From the time of rising, regardless of the output of the humidity sensor, the humidifying dish heating device is controlled based on the output of the temperature sensor to maintain the temperature in the storage chamber at the set value. The above adverse effect can be eliminated, and the temperature in the storage chamber can be smoothly maintained at the set value.

Further, since the heating value of the humidifying dish heating device can be set to an appropriate value without unnecessarily increasing, the humidity in the storage chamber can be maintained at a value close to the set value. is there.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a heat storage 1 of the present invention, and FIG. 2 is a heat storage 1
FIG. 3 is a vertical sectional view of the heating cabinet 1, FIG. 4 is a vertical sectional view of the heating cabinet 1 upper part, and FIG. 5 is another horizontal sectional view of the heating cabinet 1 upper part.

The warm storage 1 of the embodiment is used for thawing frozen foods such as frozen bento boxes and frozen hamburgers, and for heating and keeping them, and the like.
The inner box 3 made of a steel plate, which also opens to the front side, is installed in the inside at a distance, is connected by a breaker (not shown), and is filled with a foamed heat insulating material 6 between the boxes 2, 3 and the breaker. The front opening 8A of the storage chamber 8 formed of the heat insulating box 7 and formed in the inner box 3 is vertically divided by the middle partition 9 extending left and right at the center. The upper and lower openings 8A are openably and closably closed by doors 11 and 11 (the upper door 11 is omitted in FIG. 2).

A rectangular through hole 12 is formed on the rear right side of the top wall 7A of the heat insulating box 7, and a heat insulating unit box 13 is formed so as to close the through hole 12 from above and open downward. It is attached and constitutes a part of the heat insulating box 7. A heating heater 14 as a heating device is installed in the unit box 13. A blower 16 made of a sirocco fan is attached to the left side of the unit box 13, a shaft 16S thereof penetrates a left wall of the unit box 13, and a motor 16M thereof is fixed to a left side surface of the unit box 13. The unit box 13 is partitioned by a fan casing 21 into a suction side where the heating heater 14 is present and a discharge side where the blower 16 is present.

A water injection valve 23 as a water injection device for injecting water into a humidifying tray 22, which will be described later, is mounted on the ceiling wall 7A of the heat insulating box 7 in parallel with the unit box 13, and a connection port 24 thereof is not shown. Connected to the pipe. A control panel 26 is attached to the front end of the ceiling wall 7A, and a control box 27 is arranged on the rear side thereof.

A substantially gate-shaped upper duct plate 28 is attached to the upper part of the heat insulating box 7, and its upper surface 28A and left and right side surfaces 28B and 28C are the top surface 3A and the left and right side surfaces 3 of the inner box 3.
There are intervals of B and 3C. Then, between the upper surface 28A and the top surface 3A and between the left and right side surfaces 28B and 28C and the left and right side surfaces 3B,
Upper duct 4 communicating with the inside of the unit box 13 between 3C
0 is configured.

A perspective view of the upper duct plate 28 is shown in FIG. An upper surface 28A and left and right side surfaces 28B of the upper duct plate 28,
Outer flanges 29A, 29B, 29C, 29D and 29 are provided on the front end of 28C and the lower ends of the left and right side surfaces 28B, 28C.
E is bent, and a plurality of through holes 31 ... Are formed in the flanges 29D and 29E. And each flange 29A, 29B, 29C, 29D and 2
9E are the top surface 3A, the left and right side surfaces 3B, 3C of the inner box 3, respectively.
Is in contact with

The upper surface 28A of the upper duct plate 28 extends from the rear to the front and is inclined to the right, and then the left side 28
An upper partition 32 for lowering the front portion of B to the flange 29D is attached. This upper partition 32 is the top surface 3A of the inner box 3.
And the left and right side surfaces 3B and 3C, and the rear portion thereof corresponds to the lower end of the fan casing 21. As a result, the inside of the upper duct 40 has a suction side 40S where the heating heater 14 is present, and a discharge side 40S where the blower 16 is present.
Partitioned into D. A plurality of suction ports 33, ... Are provided in the front portion of the upper surface 28A, the left and right side surfaces 28B, 28C and the flange 29A located on the suction side 40S.

The left-side corner of the upper duct plate 28 is recessed (not shown in FIG. 6), and the humidifying plate 22 constituting the humidifying device 41 and the humidifying heater 42 as the humidifying plate heating device are formed therein. It is arranged. In addition, 43 is a drainage pipe for draining overflow water from the humidifying tray 22, which is pulled down to the outside by descending the left side of the storage chamber 8.

On the other hand, left and right duct plates 51, 52 are attached to the left and right side faces 3B, 3C of the inner box 3 with a space therebetween, and the left and right ducts 53, 52 are provided between them and the left and right side faces 3B, 3C.
54 are formed, and the upper ends of the left and right ducts 53, 54 communicate with the discharge side 40D and the suction side 40S of the upper duct 40 by the through holes 31 formed in the flanges 29D, 29E of the upper duct plate 28, respectively.

A plurality of through holes 57 are formed in the left and right duct plates 51, and the left and right duct plates 51, 52 are formed.
The front surface of is closed. Then, the left and right duct plates 51,
Pillars 58, 58 are attached to the upper and lower sides of 52, respectively, and rails 59 ,. The tray 61 is placed and installed.

Note that tray stoppers 62, 62, which are hits when the tray 61 is inserted, are mounted on the back surface of the storage chamber 8 in the vertical direction. Further, a transparent glass 63 is fitted in the doors 11 and 11, and a heater 64 for preventing fogging is attached to the transparent glass 63. Further, a gasket 65 is attached to the peripheral edge of the inner surface of the door 11, and a handle 66 is attached to the front surface on the non-pivotal side.

When the blower 16 is operated, warm air heated by the heating heater 14 is sucked through the fan casing 21 and directed toward the discharge side 40D on the left side of the upper partition 32 in the upper duct 40, as shown by the arrow in each figure. Is ejected. The warm air discharged to the discharge side 40D of the upper duct 40 travels along the upper surface 28A of the upper duct plate 28 and falls outside the left side surface 28B while being humidified by the humidifying device 41, and the through hole 31 of the flange 29D. Through the left duct plate 51 and the inner box 3 into the left duct 53.

The warm air descending in the left duct 53 is discharged into the storage chamber 8 from the through holes 57 ...
Most of the warm air discharged into the storage chamber 8 traverses the inside from left to right and is sucked into the right duct 54 from the through holes 57 formed in the right duct plate 52 and rises. Then, through the through hole 31 of the flange 29E of the upper duct plate 28, the upper duct 40
Flows into the suction side 40S. In addition, the warm air in the upper portion of the storage chamber 8 has a suction port 33, which is formed corresponding to the upper portion of the opening 8A.
-Is sucked from the suction side 40S. Then, the return warm air is circulated so as to be sucked into the blower 16 again via the heating heater 14.

Also, the upper door 11 for taking in and out food.
2 is opened, low-temperature (normal temperature) outside air flows into the storage chamber 8 as shown by the broken line arrow in FIG. 2, and instead warm air in the storage chamber 8 flows out from the upper part of the opening 8A as shown by the solid line arrow in the figure. try to. However, since a plurality of suction ports 33, ... Are formed corresponding to the upper part of the opening 8A, the warm air that is about to flow out is pulled back to the suction ports 33 ,. Will be done.

Next, FIG. 7 shows a block diagram of the control device 68 provided in the control box 27 of the refrigerator 1. The control device 68 is a general-purpose microcomputer 7.
The microcomputer 71 includes a temperature sensor 72 for detecting the temperature in the storage room 8 or the temperature of the intake air (hereinafter referred to as the inside temperature), and the humidity in the storage room 8 (hereinafter referred to as the inside humidity). Humidity sensor 73 for detecting
Outputs of a product temperature sensor 74 for detecting the surface temperature of the food (attached to the surface of the food) and a float switch 76 for detecting the water level in the humidifying tray 22 are input. On the other hand, the output of the microcomputer 71 is connected to the heating heater 14, the humidifying heater 42, the fog preventing heater 64, the blower 16 and the water injection valve 23.

The operation of the refrigerator 1 having the above-mentioned structure will be described. First, using the flow chart showing the program of the microcomputer 71 of FIG. 8 and the graph of FIG. 9, for example, defrosting of food such as bento after being cooked in advance-
The heating-warming operation will be described. The product temperature set value during the thawing operation described later is, for example, + 5 ° C, and the set value during the heat retention operation is + 80 ° C. Now, assuming that the frozen food is placed on the tray 61 as shown in FIG. 1 and the heating switch (not shown) of the microcomputer 71 is pressed, the microcomputer 71 detects the surface of the food by the product temperature sensor 74 in step S1. The temperature is measured, and it is determined in step S2 whether the temperature detected by the product temperature sensor 74 is decreasing.

If it is descending, the process proceeds to step S3 to clear the 30-minute counter which the microcomputer 71 has as its function. Then, in step S4, the temperature inside the refrigerator is set to, for example, X ° C from the product temperature set value (+ 5 ° C).
(For example, 30 ° C. In practice, it is determined in the same manner as the internal temperature setting value control during the defrosting operation described later.) The heating value of the heater 14 is set to a high + 35 ° C., and the heating value of the heater 14 is P (proportional) I (integrated) D
(Differentiation) control is performed to thaw food. The blower 16 is continuously operated.

After that, when the temperature detected by the product temperature sensor 74 stops decreasing and starts increasing, the process proceeds from step S2 to step S5, and it is judged whether or not the temperature detected by the product temperature sensor 74 is lower than + 7 ° C. . If it is lower, the process proceeds to step S6 to count the 30-minute counter, and in step S7, it is determined whether or not the integration of the counter has passed 30 minutes. If not, the process returns to step S4. As a result of the thawing operation, the product temperature (surface and center) is initially set as shown in FIG.
It gradually rises from about 20 ° C.

If the surface temperature detected by the article temperature sensor 74 reaches + 7 ° C. in step S5, or if the 30-minute counter has elapsed for 30 minutes in step S7, the microcomputer 71 proceeds to step S8 to perform heat retention control. It is determined whether or not the flag (FLG) is "H" (set). Here, since it is "L" (reset), the process proceeds to step S9, and it is determined whether or not the product temperature is higher than the set temperature (+ 80 ° C.). to decide. Then, if not, in step S10, the temperature inside the refrigerator is set to + 95 ° C., the heating heater 14 is controlled, and the food is heated.

Here, since the product temperature surface and the product temperature center are raised to a predetermined temperature of 0 ° C. or higher by the above-mentioned thawing operation, the product temperature surface and the product temperature center are raised at once by the setting of such a high inside temperature. (See Figure 9). By the way, food has a temperature zone in which bacteria easily propagate, and this corresponds to + 20 ° C. to + 40 ° C., but by thawing in advance as described above and heating at a high internal temperature, The times T1 and T2 during which the product temperature center passes through this temperature zone become extremely short, and the growth of bacteria is suppressed.

Here, in the prior art, since the frozen food was heated from the beginning at the internal temperature setting of + 95 ° C., there is a difference between the surface of the product temperature and the center of the product temperature as shown in FIG.
The times T1 and T2 for passing (+ 40 ° C.) were extremely long. Therefore, there was a risk that a large amount of bacteria would propagate in the food, but in the example, as described above, the bacteria could rapidly pass through this temperature range, so that such a problem could be solved.

When the product temperature (product temperature surface) becomes higher than the set temperature of + 80 ° C. by the heating operation, the microcomputer 71 proceeds from step S9 to step S11 to set the heat retention control flag, and in step S12, the inside of the refrigerator Set the temperature set value to + 80 ° C. and set the heating heater 14 to PI.
D control. After that, from step S8 to step S11
Proceed to and execute the heat insulation operation of the food.

Next, the microcomputer 71 shown in FIG.
The thawing operation of the food will be described with reference to the flowchart showing the program of FIG. The product temperature set value during the thawing operation described later is, for example, + 5 ° C. now,
Assuming that the frozen food is placed on the tray 61 as shown in FIG. 1 and the decompression switch (not shown) of the microcomputer 71 is pressed, the microcomputer 71 first sets the initial internal temperature reading flag to "H" in step S19. “(Set)”, it is not here, so step S
In step 20, it is determined whether the internal cold storage temperature detected by the temperature sensor 72 is decreasing. If it is descending, the process proceeds to step S29, where the temperature setting value in the refrigerator is set to the product temperature setting value (+ 5 ° C.) + 10.
Set to ℃ (that is, + 15 ℃)
As in 4), the heating heater 14 is PID-controlled.

Then, when the decrease of the internal cold storage temperature is completed, the process proceeds to step S21, the temperature sensor 72 measures the initial internal cold storage temperature R, and the initial internal cold storage temperature reading flag is set at step S22. Next, in step S23, it is determined whether or not the 5-minute elapsed flag is "H" (set). Since it is reset here, the process proceeds to step S24 to count the 5-minute counter which the microcomputer 71 has as its function, In step S25, it is determined whether 5 minutes have passed. Then, after 5 minutes have elapsed, a 5 minute elapsed flag is set in step S26, and in step S27, the temperature sensor 72 and the product temperature sensor 74 are used to measure the internal temperature S (5 minutes after R) and the product temperature T (product temperature at that time). Surface).

Next, in step S28, it is determined whether or not the product temperature T is higher than -5.degree. C., and if it is higher, the process proceeds to step S29, in which the inside temperature setting value is set to the product temperature setting value. The heater 14 is controlled to be + 10 ° C (that is, + 15 ° C). Here, foods such as hamburgers in a vacuum pack tend to warm up, but bento boxes and the like in packages do not warm up easily, but the product temperature T is −5 ° C. (initially −20 ° C.) 5 minutes after the lowering of the internal temperature is finished. If the temperature rises up to about ℃), it is determined that the food tends to warm up and the amount thereof is small, and the microcomputer 71 determines that the temperature is low (+15).
Thaw at ℃).

Next, when the product temperature T is -5 ° C. or lower in step S28, the microcomputer 71 determines in step S28.
It progresses from 28 to step S30, and this time the inside temperature S
(5 minutes later) and the difference between the product temperature T (ST) is calculated and this is 1
Judge whether the temperature is 0 ° C or higher. Here, when the difference S−T is smaller than 10 ° C., it can be determined that the food is likely to warm up, so the microcomputer 71 proceeds to step S31, and sets the internal temperature setting value to the product temperature setting value + X (40− (S −
(R)) ° C., the heating heater 14 is PID-controlled (however, 10 <X <30).

If the difference S-T is 10 ° C. or more, it can be determined that the food is difficult to warm, so the microcomputer 71 proceeds from step S30 to step S32 and sets the internal temperature set value to the product temperature set value + X. (60- (S-
R)) ° C. and PID control of the heater 14 is performed (however, 30 <X <50).

FIG. 14 shows how the determination control of the set temperature in the refrigerator is performed. When the SR is small, it can be determined that the temperature gradient in the refrigerator is small and the amount of food is large, and when the SR is large, the gradient is large and the amount of food is small. Therefore, when the food is easily warmed and the amount thereof is small, the base value becomes as low as 40 ° C., the difference SR becomes large, and the X becomes small. Further, when the amount is large, the difference SR becomes small and X becomes large.

On the other hand, when the food is hard to warm and its amount is large, the base value becomes as high as 60 ° C.,
The difference SR becomes smaller and the X becomes larger. When the amount is small, the difference SR becomes large and X becomes small. Therefore, depending on whether the food is easy to warm up or not, and whether it is large or small, set the internal temperature to a high value if it is difficult to warm up, and change it continuously to a low value if it is easy to warm up. Since it can be set to a value, thawing can be done quickly and properly (without overheating or lack).

The thawing operation is continued for 30 minutes from the time when the temperature inside the refrigerator rises to the set value, and thereafter, the product temperature set value of the inside temperature is set to + 5 ° C. Then, the time when the difference between the surface of the product temperature and the center of the product temperature is 2 ° C. is previously determined and set by experiment, and the thawing operation is terminated at that time.

Next, the microcomputer 71 shown in FIG.
The internal humidity control and the water injection control will be described with reference to the flowchart showing the program. In step S13, the microcomputer 71 measures the humidity inside the refrigerator with the humidity sensor 73, and in step S14, PID-controls the heat generation amount of the humidifying heater 42 so as to reach the set humidity based on the humidity inside the refrigerator.

Then, in step S15, it is judged based on the float switch 76 whether or not the water level in the humidifying tray 22 is lowered. If the water level is lowered, the process proceeds to step S16, the water injection valve 23 is opened and the humidifying tray 22 is opened. Start water injection. Next, in step S17, it is determined whether 10 seconds have elapsed from the start of water injection, and after waiting until the time has elapsed, the water injection valve 23 is closed and water injection is stopped in step S18. Thereby, the water level of the humidifying dish 22 is maintained.

The microcomputer 71 sets the internal humidity set value in the control in step S14 to, for example, 60% during the thawing operation, and sets it to a high humidity such as 95% during the heating-warming operation. To do. In this way, by thawing, heating and keeping heat under high humidity, deterioration of food due to drying is prevented.

Here, if the set value of the in-compartment temperature is relatively high when the set value of the in-compartment temperature during the thawing operation is low, the humidifying heater 42 adversely affects the storage chamber 8. That is, the output of the warming heater 14 is naturally stopped (output data = 0) by the PID control when the inside temperature reaches a set value, but when the inside humidity is less than the set value, the humidifying heater 42 Fever. This is because the heat heats the inside of the storage chamber 8 and the temperature rises abnormally.

In order to avoid such an inconvenience, in the present invention, the microcomputer 71 performs the control shown in FIG. That is, the microcomputer 71 determines in step S33 based on the output of the temperature sensor 72 whether or not the current temperature is lower than the set temperature (in-chamber temperature set value) -α. If it is low, the humidification heater temperature control flag is cleared (reset) in step S39, and it is determined in step S37 whether or not this is "H" (set). Here, of course, no, so the routine proceeds to step S38, where the microcomputer 71 executes the above-mentioned normal control operation.

Here, the temperature inside the chamber rises, and step S3
When the current temperature becomes equal to or higher than the set temperature −α in 3, the process proceeds to step S34, and it is determined whether the data of the heating heater 14 (output data of the PID control) is 0 or not. Here, when the internal temperature becomes higher than the set temperature, the heating heater 1
Since the data of 4 becomes 0 as a matter of course, the microcomputer 71 proceeds to step S35 to determine whether the present temperature is higher than the set temperature + β this time. If the temperature inside the refrigerator still rises due to the influence of the humidifying heater 42 and becomes higher than the set temperature + β, even though the data of the heating heater 14 is 0, the microcomputer 71 In step S36, the humidification heater temperature control flag is set, and in step S37, it is determined whether or not this is "H" (set). Since it is set here, the routine proceeds to step S40, and the microcomputer 71 comes to execute the temperature control operation by the humidifying heater 42.

In the temperature control by the humidifying heater 42,
The microcomputer 71 uses the output of the temperature sensor 72 regardless of the output of the humidity sensor 73.
The inside temperature is maintained at a set value (set temperature) by PID control of No. 2.

Then, when the temperature inside the storage chamber falls and becomes lower than the preset temperature -α, the steps S33 to S3 are performed.
9, the humidifying heater temperature control flag is cleared, the process proceeds from step S37 to step S38, and the microcomputer 71 returns to the normal control operation. Therefore, according to the present invention, the adverse effect of the humidifying heater 42 on the temperature of the storage chamber 8 can be eliminated, and the temperature in the storage chamber 8 can be smoothly maintained at the set value. In addition, the humidifying heater 42
Since the heat generation amount can be set to an appropriate value without unnecessarily increasing, the humidity in the storage chamber 8 can be maintained at a value close to the set value.

Next, the microcomputer 71 shown in FIG.
The control of the fog-preventing heater 64 will be described with reference to the flowchart showing the program. The microcomputer 71 sends the temperature sensor 7 in step S41.
2 and the humidity sensor 73 measure the inside temperature and the inside humidity, and it is determined in step S42 whether the inside temperature is lower than + 60 ° C. When the temperature inside the refrigerator is lower than + 60 ° C., the temperature difference from the outside air is small, so that the inner surface of the transparent glass 63 is unlikely to fog. Therefore, the microcomputer 7
In step S43, the energization time of the heater 64 is set to 0.

On the other hand, in step S42, the inside temperature is +60.
If the temperature is ℃ or above, the process proceeds to step S44, and the inside humidity is 60.
Judge whether it is lower than%. Then, even if the humidity is low, fogging is unlikely to occur, so the flow proceeds to step S43. On the other hand, if the internal humidity is 60% or more, the process proceeds to step S45, and it is determined whether the internal temperature is lower than + 80 ° C. When the temperature is + 60 ° C. or higher and lower than + 80 ° C., the process proceeds to step S46, and this time, it is determined whether or not the internal humidity is lower than 80%.

In this case, when the inside humidity is lower than 80%, a slight amount of fogging is likely to occur.
The heater 64 is energized for 4 minutes and rested for 6 minutes (non-energized). By controlling the energization of the heater 64 under such temperature and humidity conditions, the transparent glass 63 is slightly fogged (the inside can be seen through).

Next, in step S45, the temperature in the refrigerator is +80.
If the temperature is higher than ℃, the process proceeds to step S48, and the inside humidity is 80
Judge whether it is lower than%. And even if the humidity is low, it becomes more likely that clouding will occur,
Since clouding is likely to occur even when the internal humidity is 46% or more in 46, in any case, the heater 64 is controlled by energizing for 6 minutes and resting for 4 minutes (non-energized) in step S49. As a result, the amount of heat generated increases, and even in this state, the transparent glass 63 is slightly fogged (the inside can be seen through).

Next, in step S48, the humidity in the refrigerator is 80%.
In the above case, clouding is more likely to occur, so the heater 64 is controlled by energizing for 8 minutes and resting for 2 minutes (non-energized) in step S50. As a result, the amount of heat generated is further increased, and even in this state, the transparent glass 63 is slightly clouded (the inside can be seen through).

Here, if all the fog on the transparent glass 63 is eliminated by continuously energizing the heater 64,
At first glance, it becomes impossible for the user or the like to determine whether or not the refrigerator 1 is operating. When the door 11 is opened in a high temperature and high humidity condition, there is a risk that hot air may blow out to cause burns. However, in the embodiment, since the energization of the heater 64 is controlled to such an extent that the transparent glass 63 is slightly fogged, it may be a glance. Thus, the operating state can be determined, and such inconvenience can be avoided.

As a means for avoiding such inconvenience, a thermo label may be attached to the transparent glass 63 near the handle 66 to confirm that the high temperature and high humidity operation is being performed by letters or pictures. However, it goes without saying that if the heater 64 is controlled as described above, such a thermolabel is not necessary.

[0053]

As described above in detail, according to the present invention, when the temperature in the storage chamber becomes higher than the set value and the temperature rises even when the output of the heating device is stopped, the temperature in the storage chamber becomes high. From the time of rising to a predetermined value, regardless of the output of the humidity sensor, the humidification dish heating device is controlled based on the output of the temperature sensor to maintain the temperature in the storage chamber at the set value, so the storage chamber by the humidification dish heating device is controlled. Therefore, it is possible to eliminate the adverse effect on the temperature of the storage chamber and smoothly maintain the temperature in the storage chamber at the set value.

Further, since the heating value of the humidifying dish heating device can be set to an appropriate value without unnecessarily increasing, the humidity in the storage chamber can be maintained close to the set value. is there.

[Brief description of drawings]

FIG. 1 is a front view of a heating cabinet according to the present invention.

FIG. 2 is a vertical sectional side view of the heating cabinet of the present invention.

FIG. 3 is a vertical cross-sectional front view of the heating cabinet of the present invention.

FIG. 4 is a plan sectional view of the upper part of the heating cabinet of the present invention.

FIG. 5 is another plan sectional view of the upper part of the heating cabinet of the present invention.

FIG. 6 is a perspective view of an upper duct plate.

FIG. 7 is a block diagram of the control device for the heating cabinet of the present invention.

FIG. 8 is a flowchart showing a program of a microcomputer.

FIG. 9 is a diagram showing a temperature inside a refrigerator and a product temperature in the refrigerator according to the present invention.

FIG. 10 is a diagram showing a temperature inside a refrigerator and a product temperature in a conventional refrigerator.

FIG. 11 is a flow chart showing a program of the same microcomputer.

FIG. 12 is a flow chart showing a program of the same microcomputer.

FIG. 13 is a diagram showing the internal temperature and the product temperature of the same refrigerator according to the present invention.

FIG. 14 is a diagram illustrating control of the microcomputer of FIG.

FIG. 15 is a flow chart showing a program of the same microcomputer.

FIG. 16 is a flowchart showing a program of the same microcomputer.

[Explanation of symbols]

 1 Heat Storage 8 Storage Room 14 Heating Heater (Heater) 16 Blower 22 Humidifying Plate 42 Humidifying Heater (Humidifying Plate Heating Device) 68 Controller 71 Microcomputer 72 Temperature Sensor 73 Humidity Sensor

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G05D 27/00 A // A23L 3/365 Z

Claims (1)

[Claims] 1. A warming cabinet formed by heating a storage chamber with a heating device, a humidifying plate for humidifying the storage chamber, a humidifying plate heating device for heating the humidifying plate, and a temperature in the storage chamber. A temperature sensor for detecting the temperature, a humidity sensor for detecting the humidity in the storage chamber, and by controlling the heating device based on the output of the temperature sensor, the temperature in the storage chamber is maintained at a set value, the humidity A control device for maintaining the humidity in the storage chamber at a set value by controlling the humidifying dish heating device based on the output of the sensor, the control device stopping the output of the heating device. In the state, when the temperature in the storage chamber rises to a predetermined value, regardless of the output of the humidity sensor, the humidifying tray heating device is controlled based on the output of the temperature sensor to control the temperature in the storage chamber. To the set value Heating cabinet, characterized in that the lifting.