WO1998025085A1

WO1998025085A1 - Heating device

Info

Publication number: WO1998025085A1
Application number: PCT/JP1997/004078
Authority: WO
Inventors: Hideki Terasawa; Kazuho Sakamoto
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 1996-12-03
Filing date: 1997-11-10
Publication date: 1998-06-11
Also published as: JPH10223366A; AU4886497A

Abstract

A heating device having an automatic thawing function which is simple and advantageous in cost compared with a conventional weight sensor and a system for detecting the field strength in a heating chamber with an antenna. A thermister (17) is exposed inside a heating chamber (1) and mounted to the inner surface of a plate constituting the heating chamber to detect the temperature in the heating chamber (1). Using output of the thermister, the progress of heating of a frozen food is measured. Control means (18) controls drive means (20) of high frequency generating means (16) on the basis of information detected.

Description

Heating equipment Technical field

The present invention relates to a heating apparatus having an automatic thawing function.

As a means to detect the thawing of frozen food in a heating chamber in a conventional heating device, a method of using a weight sensor to predict the thawing end time from the weight value, or a method of heating A method for determining the thawing time by detecting the electric field intensity in a room with an antenna, and a method using a radio wave absorber disclosed in US Pat. No. 4,870,235. and so on .

However, it is costly disadvantageous to use a weight sensor to predict the ending time of thawing of frozen food in the heating chamber based on the weight value of the weight sensor. In addition, the method of detecting the electric field strength in the heating chamber with an antenna requires a complicated method for measuring the electric field strength, and furthermore, a detection circuit is provided for the sensor. There was a problem that it was necessary and, if not as heavy as a weight sensor, was costly disadvantageous. DISCLOSURE OF THE INVENTION

The heating device according to the present invention includes: a heating chamber for accommodating an object to be heated; a high-frequency generating means for supplying microwave energy to the heating chamber; and a high-frequency generating means. Driving means for driving; temperature detecting means installed in the heating chamber; and information from the temperature detecting means. And control means for controlling the driving means based on the control information. The temperature detecting means continuously and temporally detects the temperature in the heating chamber, and based on the information detected by the temperature detecting means, the control means controls the driving means. Then, the object to be heated is heated, and the heating is automatically terminated. Particularly, the control means controls the magnitude of the output of the high-frequency generation means and the drive time based on the information detected by the temperature detection means. With this configuration, optimal heating is possible, and at the same time, the configuration is simple and the manufacturing cost is low.

Particularly, the object to be heated is in a frozen state before heating, and the control means has a function for thawing the object to be heated in the frozen state. This configuration enables optimal thawing of frozen foods and the like.

Particularly preferably, the temperature detecting means has a thermistor element thermally coupled to the inner surface of the heating chamber. With this configuration, the temperature of the object to be heated can be detected more accurately, so that remarkably excellent heating or thawing becomes possible.

Particularly preferably, the temperature detecting means is exposed inside the heating chamber and is in close contact with the inner surface of a plate forming the heating chamber. According to this configuration, the temperature of the object to be heated can be detected more accurately, so that remarkably excellent heating or thawing becomes possible.

Particularly preferably, the heating chamber has a top plate, a rear plate, and a body plate, and the temperature control means is installed in a region behind the top plate or in a region on the exhaust port side of the top plate. It has been done. Particularly preferably, the heating chamber has a top plate, a rear plate, and a body plate, and the temperature control means includes the top plate and the body plate. It is fixed to the top plate by an “L” -shaped mounting bracket fixed to the rear plate. Particularly preferably, the temperature detecting means is fixed to a mounting bracket, and has a pair of a first bracket having a projection and a second bracket having a notch. A first concave portion formed between the protrusion and the inner surface, a second concave portion formed by the notch, and a second concave portion formed between the protrusion and the inner surface. During this time, the mounting bracket having the temperature detecting means is fitted. According to the above configuration, the temperature of the object to be heated can be detected more accurately, and at the same time, the assembling work of the heating device is simplified, and the manufacturing cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a heating device according to an embodiment of the present invention and a configuration diagram without the configuration, FIG. 2 is a plan view of the heating device shown in FIG. 1, and FIG. FIG. 4 is a perspective view of a heating chamber of the heating device shown in FIG. 4, FIG. 4 is a cross-sectional view of the temperature detecting means of the heating device shown in FIG. 1, and FIG. 5 is a heating device shown in FIG. FIG. 6 is a cross-sectional view of one embodiment of the mounting and fixing structure of the temperature detecting means of FIG. 6, and FIG. 6 is a sectional view of another embodiment of the mounting and fixing of the temperature detecting means of the heating device shown in FIG. FIG. 7 is a cross-sectional view, FIG. 7 is a graph showing the `` heating time-temperature detection means output '' characteristic of the heating device shown in FIG. 1, and FIG. 8 is a heating device shown in FIG. FIG. 9 is a plan view of the fixing structure for mounting the temperature detecting means of FIG. 9, and FIG. Plan diagram of a constant structure, when the first 0 Figure digits with which Ri taken in the heating chamber surfaces other preparative preparative only fitting with Ri dated only method Ri temperature detecting means of the heating device according to an embodiment of the present invention FIG. 1 is a plan view and a side view of a heating device, and FIG. 2 is a plan view of a mounting bracket of a temperature detecting means of a heating device according to an embodiment of the present invention. FIG. FIG. 13 is a plan view showing the configuration when the detection means is attached and fixed, and FIG. 13 shows a position where the thermistor is attached to the carothermal chamber of the heating device according to one embodiment of the present invention. FIG. 14 is a characteristic diagram showing “heating time-temperature detection means output” of the heating device according to one embodiment of the present invention. FIG. 15 is an embodiment of the heating device according to one embodiment of the present invention. FIG. 16 is a flow chart for explaining the operation of the present invention, and FIG. 16 is a view showing the relationship between “heating time and threshold” of the heating device according to one embodiment of the present invention. The figure shows the relationship between the "weight of food and the time to reach a threshold value" of the heating device according to one embodiment of the present invention. Oh Ru a plan view your good beauty left side view of the heating apparatus of the inventions of one embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 3 is a perspective view of a heating chamber of the heating device according to one embodiment of the present invention. In FIG. 3, the heating chamber 1 has an annular body 4, a front plate 6 and a rear plate 7. The annular body portion 4 includes a copper plate 2 bent in a U-shape, and a top plate 3 joined to the copper plate 2. The front plate 6 has an opening 5. The annular body 4 has a first air inlet 9. The rear plate 7 has a second air inlet 10. The top plate 3 has a thermistor mounting hole 8.

FIG. 1 is a configuration diagram showing a configuration of a heating device according to an embodiment of the present invention, and FIG. 2 is a plan view of the heating device. In FIGS. 1, 2 and 3, the door 24 on the front of the heating chamber 1 closes the opening 5 of the heating chamber 1 by opening and closing itself. From keyboard 21 Various commands are input by the operator, and the input commands are decoded by the control means 18. Then, the control means 18 displays the input cooking menu and numerical information on the display unit 22. Based on the input of the control means 18, the heating of the object 15 placed on the placing plate 14 in the heating chamber 1 is started. Heating is performed by energizing the heating means via the driving means 20. In this embodiment, a magnet port 16 is provided as a heating means, and the heating chamber 1 is irradiated with a microwave through the waveguide 11. . The mounting plate 14 is driven to rotate by the motor 13, and uneven heating of the object 15 is improved.

As the temperature detecting means, a thermistor 17 is used, and the thermistor 17 is connected to a control means 18 via a detecting circuit 19. Further, the heat sink 17 is exposed into the heating chamber 1 via a heat sink mounting hole 8 opened in the top plate 3. According to the fan 23, the outside air taken in from the second intake port 10 is the first intake port consisting of the magnet port 16 and the punching metal. After passing through 9, the heat generated from the heated object 15 is transmitted to the summiter 17 and exhausted from the exhaust port 12 formed by the punching metal. . As the thermistor 17, for example, a hammer type thermistor is used. FIG. 4 shows a sectional view of the thermistor 17. In FIG. 4, a summit element 54 is provided at the end of a lead section 56 fixed to a metal case 52 with a filler 55, and the summit element is provided. The heater element 54 is bonded to the metal case 52 with a silicone resin 53 having excellent thermal conductivity and heat resistance. That is, the thermistor element 17 is thermally coupled to the metal case 52. At this point, the output characteristics of the thermistor 17 greatly differ depending on the method of mounting the thermistor 17. The method in which the thermistor 17 is mounted by way of the punching metal 31 and is not exposed to the heating chamber 1 and the thermistor One possible way is to expose 17 to heating chamber 1. The following two types of thermistor mounting methods were compared and examined. One method is to install a punching metal 31 on the top plate 3 of the heating chamber 1 as shown in Fig. 5, and to use a This is a method of mounting the thermistor 17 via the guide 32 with the above resin material. In this configuration, the thermistor element 54 in the thermistor 17 is not thermally coupled to the inner surface forming the heating chamber 1 and the thermistor 1 The output of 7 is governed by the ambient temperature in the heating chamber 1. As another method, as shown in Fig. 6, a method of exposing the collector 17 to the inside of the heating chamber 1 and attaching it directly to the top plate 3 constituting the heating chamber 1 is used. It is. In this configuration, the collector 17 is directly connected to the atmosphere in the heating chamber 1, and the collector element 54 is connected to the heater 54 as shown in FIG. It is thermally connected to the top plate 3 of the heating chamber 1 via the metal case 52.

These two methods were compared using a beef mince and loading loads of 450 g and 900 g, respectively. Figure 7 shows the results. In FIG. 7, the method of directly mounting the thermistor 17 on the surface of the heating chamber (a and b in FIG. 7) produces a large absolute value of the output change. In addition, it exhibited excellent "output change-load weight" characteristics. On the other hand, the method in which the thermistor 17 is mounted via the resin guide (Figs. 7c and d) shows the difference between the small output change value and the small difference. Output change-Load weight "characteristics. Excellent output change-heavy load In order to obtain the “amount” characteristic, the control of the temperature of the heating chamber is not based on the detection of only the ambient temperature. It is desirable to control with a composite monitor. Further, it is desirable that the temperature detecting means such as the thermostat 17 be exposed inside the heating chamber 1 and be in close contact with the inner surface of the plate forming the heating chamber 1.

In order to realize the above configuration, a method of fixing two types of thermistors 17 to the heating chamber 1 will be described. The first method is limited in the place of installation, but it is a method that makes the manufacturing cost cheaper, and the second method can be installed in almost any place This is a method that makes the manufacturing cost slightly higher. FIG. 6 is a cross-sectional view of the first method in which the thermistor 17 is attached to the top plate 3, and FIG. 8 is a plan view thereof. In FIGS. 6 and 8, the mounting bracket 51 is L-shaped. The thermistor 17 is inserted into the mounting hole 8, and then the protrusion 52 a of the metal case of the thermistor 17 is attached to the first area of the top plate 3. 3 a and the mounting bracket 51, and then use the screw 57 to fasten the rear plate 7 and the first area 3 a of the top plate 3 and the mounting bracket 51 together. . When the length of the first area 3a of the top plate 3 is short, a step is formed using the mounting bracket 51, and the rear plate 7 and the mounting bracket 51 alone are used. You may try to tighten it.

Further, as shown in FIG. 9, it is desirable that the mounting bracket 51 has a slit portion 25, and depending on the configuration, the lead portion is provided. It is possible to assemble without passing through the end of the mounting bracket 56 through the hole of the mounting bracket 51, and it is possible to improve production efficiency.

Describes the second method for mounting the thermostat in the heating chamber The explanatory diagrams for this purpose are shown in FIGS. 10, 11 and 12. In FIG. 10, the projection 26 a formed by bending the tip of one side of the L-shaped bracket 26 around the thermistor mounting hole 8 in FIG. The notch 27 b of the notched flat metal piece 27 is centered on the notch 27 b in the direction of the arrow so that the protrusion 27 a is directed into the heating chamber. The L-shaped fitting 26 and the flat metal fitting 27 are welded to the top plate 3 of the heating chamber 1 with the L-shaped fitting 26 and the flat metal fitting 27 facing each other.

10 to 12, the mounting bracket 28 has a notch 29. Insert the thermistor 17 into the mounting hole 8, then fit the notch 29 of the mounting bracket 28 into the projection 26 a, and then Then, twist the projection 27 a of the flat metal fitting 27. In this way, the mounting bracket 28 is fixed. The completed installation is shown in Fig. 12. In FIG. 12, the mounting bracket 28 has a slit portion 30, and the slit portion 30 passes through the lead portion 56. Are assembled.

Next, the position for mounting the thermistor 17 was examined from the viewpoint of the following items 1 to 3.

(Item 1) Is the absolute value of the output change large?

(Item 2) Is the "output change-load weight" characteristic good (ie, is the output change sharply with a small load, or is the output change slow with a large load)?

(Item 3) Check if the output changes according to the load shape.

From the above three viewpoints, the first mounting position 50 and the second mounting position 33 shown in FIG. 13 were compared. The first mounting position 50 is near the top of the top 3 and the second mounting position 33 is Near the center of the city. Figure 14 shows the results. In FIG. 14, when the thermistor was installed at the first mounting position 50, particularly excellent performance was exhibited. In other words, comparing the time required to reach the threshold value A, it was found that when installed at the second mounting position 33, 2 kg of the chicken with the higher value was 2 kg. A tall load as if frozen (dotted line, g) shows a change in output similar to a 3 kg low-profile pig surroin (dotted line, f). The characteristics of eye 2 were slightly inferior. On the other hand, when the thermistor 17 is installed at the first mounting position 50 behind the top plate 3, the time until the threshold value B is reached is reduced. By comparison, 2 kg of pork sausage (solid line, e) and 2 kg of chicken (solid line, g) show the same characteristics as each other, and the characteristic of item 2 is superior.

Next, Fig. 17 shows the results of an experiment on the relationship between the time required to reach the threshold value B and the weight of the food when the capacity of the heating chamber is different. The monitor was installed at the second mounting position 33 in Fig. 13. In FIG. 17, when the capacity of the heating chamber is small, the time required to reach the threshold value B increases as the weight of the food increases. On the other hand, when the capacity of the heating chamber is large, the time to reach the threshold value B with respect to the weight of the food shows a small change. In other words, when the volume in the warehouse is large, the correlation between the food weight and the time to reach the threshold value B tends to become poor. Let us consider the reason for this using the heating device shown in Fig. 18.

In FIG. 18, the blown air from the fan 23 removes the object to be heated 15 from the intake hole 9, and then the air flows through the vicinity of the thermistor mounting hole 8. After that, it is exhausted from the exhaust port 12. At this time, if the inside volume of the heating chamber is large, the object to be heated 15 is placed near the hole 8 for mounting the thermistor. The blown air becomes difficult to collect. Therefore, if the summiter 17 is mounted in the mounting hole formed at the third mounting position 49 near the left end of the top plate 3, the internal capacity of the cabinet will be large. Even at this time, at the threshold value approximately 1.3 times the threshold value B, when the internal capacity is small, the mounting formed at the first mounting position 50 is small. The characteristics of the time to reach the "food weight-threshold value" were obtained, which were almost the same as when the thermistor was attached to the attachment hole. In FIG. 18, the width of the heating chamber is A w, the depth is B d, and the height is Ch.

The mounting position is not limited to the first mounting position 50 near the top plate 3 as long as the above (items 1 to 3) are satisfied, and may be at any position. Alternatively, as shown in FIG. 13, a fourth mounting position 34 on the side surface of the copper plate 2 is also possible.

In automatic cooking using a sensor, the control algorithm is stored in the control means in advance, and driven according to the output of the sensor. A control signal is issued to the means to control the heating energy and determine the cooking time. Hereinafter, the present embodiment will be described.

First, the control algorithm will be described with reference to a flowchart shown in FIG. 15 and FIG. When the user puts the object to be heated 15 into the heating chamber 1 and selects “thaw” with the keyboard 21, the control means 18 firstly proceeds to the process 35 with the thermometer. Take in the output of unit 17 (this value is V (0)). After the completion of the output capture, the control means 18 drives the drive means 20 and the like in step 36 to start heating. During the heating, at step 37, the output of the monitor 17 is captured at regular intervals (this value is set to V (t)). In step 38, “AV (t) = V (t) —V (0)” Is calculated and compared with the threshold value VI stored in the control means 18 in advance in step 39, and if AV (t) becomes larger than VI, Proceed to the next step 40, but return to step 37 if it is less than V1. If V (t) is greater than V1, change the heating power in step 40. Next, in step 41, the additional heating time “△ T = K (T—TO) + B” is calculated. Here, “T” is the heating time until △ V (t) becomes V1 or more in step 39, and “T0” and “B” are the control means 1 in advance. This is the value stored in 8. In steps 42 and 43, the calculated ΔΤ is subtracted at regular intervals, and the heating is terminated when the difference becomes “0” or less.

The reason why the output taken in step 35 is used as the initial output will now be described with reference to FIG. Fig. 16 shows the relationship between the heating time (t) and the output change value (V) when heating 450 g of beef mince and 2 kg of pork surroin. Show the relationship. Normally, when performing output processing using a temperature sensor, a so-called minimum holder is used, but in this embodiment, a minimum holder is used. No. As shown in Fig. 16, the larger the weight of the object to be heated 15, the greater the amount of dip compared to the initial output of the thermistor There is a tendency . For example, waveform "e" is the output when 450 g of beef mince is used as the object to be heated, and the initial drop of waveform "e" is almost the same. In addition, the time from the captured output “V eI” to the point “V e2” where the threshold value C is reached is “t 11”. However, the waveform “f” is an output when 2 kg of pig surroin is used, and an initial dip in the waveform “f” occurs. When the change of the threshold value C from the maximum point "Vf2" of the drop is shown in Fig. 16 The interval is “t2!”. On the other hand, the time from the output “V fi” captured in step 35 to the point “V f 3” indicating the change of the threshold value C is “t 22”. . In other words, there is a difference between the times at which the weight of the object to be heated reaches a constant threshold value C by only △ t = t22-t2i. Out . Therefore, in order to increase the cooking time in proportion to the weight, take the value of “Vf1” instead of “Vf2”, that is, in step 35. Use the output as the reference value. This improves the "output change-load weight" characteristics.

Although the thermistor element thermally connected to the heating chamber is used in the present embodiment, the above-described items 1 to 3 can be applied even if the thermistor element is not thermally connected. A configuration that satisfies the condition, for example, a configuration that amplifies the output of the temperature detection means by a circuit is also possible. Industrial applicability

As described above, according to the present invention, the degree of heating progress of the frozen food is detected by the output of the temperature detecting means mounted in the heating chamber, and the driving means is controlled. The configuration is as follows. With this configuration, it is possible to easily detect the degree of heating of the defrosted food without using complicated conventional methods, and to realize the optimum defrosting. The cost can be reduced.

Further, by using a thermistor element thermally coupled to the heating chamber surface, the change in the output value of the thermistor is large and the thermistor element has a large change in the output value. The "output change-load weight" characteristic of the star is improved.

In addition, the temperature detection means is exposed into the heating chamber, and at the same time, is brought into close contact with the inner surface of the plate forming the heating chamber, so that the temperature sensor is exposed. The change in force value is also large, and the "output change-load weight" characteristic in the summer is improved.

In addition, the temperature detection means is attached to the rear of the tabletop, so that the stable output of thermistor is independent of the shape of the load. Characteristic ”is improved.

In addition, the temperature detection means can be attached to the left side of the top plate to increase the threshold value and increase the size of the inside of the cabinet. The characteristics of "time to reach the threshold value of CJCI weight" are improved.

In addition, by using the output of the thermistor before the start of heating as a reference value and processing the subsequent output, the “output change-load weight of the The characteristics are improved.

Furthermore, by fixing the temperature detecting means using L-shaped brackets that contact the rear plate and upper plate of the heating chamber, the mounting configuration is simplified, and The downsizing is achieved, and the workability is further improved.

Further, the workability is improved by fixing the thermistor by using the slit-formed bracket.

Claims

Scope of request Heating chamber for storing the object to be heated in a frozen state,

A high-frequency generation means for supplying microwave energy to the heating chamber;

Driving means for driving the high frequency generating means;

A temperature detecting means installed in the heating chamber;

A heating device comprising: control means for detecting the degree of progress of heating of the object to be heated from the output of the temperature detecting means and controlling the driving means.

A heating chamber for storing the object to be heated

A high frequency generating means for supplying microwave energy to the heating chamber;

Driving means for driving the high frequency generating means;

A temperature detecting means installed in the heating chamber;

A heating device comprising: control means for determining a subsequent heating time based on a heating time from a temperature before the start of heating to a predetermined temperature.

A heating chamber having a top plate, a rear plate, a side plate, and a bottom plate, and for storing an object to be heated;

Driving means for driving the high frequency generating means;

A temperature detecting means installed in the heating chamber;

The drive unit is controlled based on information from the temperature detection unit. Control means and

The heating device, wherein the temperature detecting means is fixed using an L-shaped bracket fixed to the top plate and the rear plate.

A heating chamber for storing the object to be heated

A high-frequency generating means for supplying microwave energy to the heating chamber;

Driving means for driving the high frequency generating means;

Temperature detecting means installed in contact with the inner surface of the heating chamber, and control means for controlling the driving means based on information from the temperature detecting means,

The inner surface of the heating chamber has a mounting bracket having a slit formed therein, and the temperature detecting means is fitted in the slit and fixed in the heating chamber. Heating equipment.

In any one of the first, second, third and fourth aspects of the present invention, the temperature detecting means is a thermistor element thermally coupled to an inner surface of the heating chamber. A heating device characterized by having: In any one of the first, second, third, and fourth aspects of the present invention, the temperature detecting means is exposed inside the heating chamber, and forms the heating chamber. A heating device characterized by being in close contact with the inner surface of a slab.

In any one of the first, second, third and fourth aspects of the present invention, the temperature detecting means is installed in a region behind a top plate forming the heating chamber. A heating device characterized in that:

In any one of the first, second, third and fourth aspects of the present invention, the temperature detecting means may be configured to discharge a top plate forming the heating chamber. Heating device characterized by being installed in the pore side area. A heating chamber for storing the object to be heated, and

Driving means for driving the high frequency generating means;

Temperature detection means installed in the heating chamber;

Control means for controlling the drive means based on information from the temperature detection means,

The temperature detecting means detects the temperature in the heating chamber by connecting the temperature with time.

The control means controls the driving means based on the information detected by the 度 m degree detecting means, thereby heating the object to be heated, and automatically terminating the heating. Heating equipment.

10. The heating device according to claim 9, wherein the temperature detecting means has a thermostat element thermally coupled to an inner surface of the heating chamber. 0

The ninth aspect of the present invention is characterized in that the temperature detecting means is exposed inside the heating chamber and is in close contact with an inner surface of a plate forming the heating chamber. The heating device.

In the ninth aspect of the present invention, the object to be heated is in a frozen state before heating, and the self-control means thaws the heated object in the frozen state. A heating device characterized by having a function of:

In the ninth aspect of the present invention, the control unit may be configured to control the high frequency based on the information detected by the temperature detection unit. A heating device characterized by controlling the magnitude of the output of the generating means and the driving time.

14. In the ninth aspect of the present invention, based on the information on the amount of change in temperature after a predetermined time from the start of heating the object to be heated, detected by the temperature detecting means. The heating device, wherein the control means controls the driving means to control the magnitude of the output of the high frequency generating means and the driving time.

15. In the ninth aspect of the present invention, the object to be heated is in a frozen state before heating, and the heating of the object to be heated detected by the temperature detecting means is started. The control means controls the magnitude of the output of the high frequency generation means and the drive time on the basis of the information on the amount of change in temperature after a predetermined time from A heating device characterized in that it has a function for thawing things.

16. In claim 12, the control means reads an output “V (0)” of the temperature detection means at an early stage of heating, and the control means reads the predetermined time of the temperature detection means. The subsequent output “V (t)” is read, and when “V (t) —V (0)” is larger than the threshold value “VI” stored in the control means, A heating device, wherein the control means controls and changes the magnitude of the output of the high frequency generation means.

17. In claim 12, the control means has a first storage value “T 0”, a second storage value “B”, and a third storage value “K”. When the “V (t)” is a time larger than “1”, the control means sets “ΔΤ = ΚΚ (T—TO)”. The heating device is characterized in that the heating is calculated so that the heating is continued until “△ T” becomes “zero”.

18. The method according to claim 12, wherein the temperature detecting means has a thermistor element thermally coupled to an inner surface of the heating chamber. Heating equipment.

19. In claim 12, the inner surface of the heating chamber has a hole, and the temperature detecting means is a metal case and a heat conductive member electrically connected to the metal case. A metal element, wherein the metal case is located in the hole of the heating chamber, and an outer surface of the metal case is fixed in contact with an inner surface of the heating chamber. A heating device that specializes in:

20. In Claim 12, the heating chamber has a top plate, a rear plate, and a body plate, and the temperature control means is installed in a rear area of the top plate. A heating device characterized by this.

21. In claim 12, the heating chamber has a top plate, a rear plate, and a body plate, and the temperature control means is provided in an area of the top plate on the side of the exhaust port. A heating device characterized in that:

22. In Claim 12, the heating chamber has a top plate, a rear plate, and a body plate, and the temperature control means is fixed to the top plate and the rear plate. A heating device characterized in that the heating device is fixed to the top plate by an “L” -type mounting bracket.

23. In Claim 22 of the claims, the "L" -shaped mounting bracket forms a slit portion, and the lead portion of the temperature detecting means has the slit portion. A heating device characterized in that it is assembled through a gating part.

24. In claim 12, wherein the temperature detecting means is fixed to a mounting bracket, and has a notch formed with the first metal fitting having a projection. A pair of metal fittings having two metal fittings are installed so as to face the inner surface of the heating chamber, and the first notch formed between the protrusion and the inner surface and the notch form a notch. A heating device characterized in that the mounting bracket having the temperature detecting means is fitted between the formed second concave portion and the second concave portion.

25. In Claim 24, the inner surface of the heating chamber has a first hole, and the mounting bracket has a second hole formed in a central part, The first hole and the second hole are fitted with each other, and the temperature detecting means is installed in the −− hole and the second hole, and the temperature detection unit is disposed in the −th hole and the second hole. A heating device characterized in that both ends of the mounting bracket are fitted and fixed in the one concave portion and the second concave portion, respectively.

26. In claim 25, wherein the mounting bracket has a second notch formed at one end thereof, wherein the second notch is provided. A heating device, characterized in that a notch is fitted in the first recess.

27. In claim 24, the second metal fitting is twisted and bent so as to push the mounting metal about the notch. A heating device characterized by: