JPH10169999A - Cooker - Google Patents

Abstract

(57) [Problem] To provide a heating device having a heating element for heating and cooking outside a heating chamber so that the heating chamber can be efficiently heated without increasing the cost. SOLUTION: A wall portion of a heating chamber 23 (an upper plate 25 of an inner box 22).
And grooves 32, 33 are formed on the outer surface of the bottom plate 26) with the formation of ridges 34, 35 protruding inward of the heating chamber 23, and the heating elements 36, 37 are rod-shaped to be in close contact with the grooves 32, 33. Was inserted. As a result, the heating elements 36 and 37 reliably and directly contact the wall of the heating chamber 23 with an increased contact area. On the back side of the grooves 32 and 33, the ridges 3
4, 35, whereby the wall of the heating chamber 23 can be reinforced, so that the wall thickness of the wall of the heating chamber 23 can be reduced,
The transmission of the heat generated by the heating elements 36 and 37 into the heating chamber 23 is further improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device having a heating element for cooking outside a heating chamber.

[0002]

2. Description of the Related Art Conventionally, a heating cooker such as an electric oven or a microwave oven with a heater has a heating element (heater) for heating and cooking inside and outside a heating chamber. Has been provided. FIG. 6 shows a conventional structure in which a heating element is provided inside the heating chamber, in which the inside of the heating chamber 3 surrounded by the inner box 2 inside the outer box 1, especially the upper part. Heating elements 4,
5 are provided.

However, in this case, the effective internal volume of the heating chamber 3 is reduced by the amount of the heating elements 4 and 5 disposed inside the heating chamber 3, so that a large object to be heated is housed. Can not do. Dirt adheres to the inner wall surface of the heating chamber 3 as the object to be heated is heated, and the heating element disposed inside the heating chamber 3 is folded to wipe off the adhered dirt. It is difficult to work because 4 and 5 are in the way.

On the other hand, FIG. 7 shows a conventional structure in which a heating element is provided outside the heating chamber, and the heating element is provided outside the heating chamber 13 surrounded by the inner box 12 inside the outer box 11. In particular, heating elements 14 and 15 are disposed on the outer surface of the upper wall and the outer surface of the bottom wall, respectively.

In this case, since the heating elements 14 and 15 are located outside the heating chamber 13, the effective internal volume of the heating chamber 13 is not reduced by the heating elements 14 and 15, and a large object to be heated can be stored. Can be housed and heated.
In addition, when the cleaning is performed to wipe off dirt attached to the inner wall surface of the heating chamber 13, the work is easy without the heating elements 14 and 15 being in the way.

[0006]

As described above, the heating chamber having a heating element inside the heating chamber and the heating chamber having the heating element outside the heating chamber have a problem in terms of the effective internal volume and the cleanability of the heating chamber. It is more advantageous to have one on the outside.

In the case where the heating elements are provided outside the heating chamber, the heating elements 14 and 15 are heating wires such as nichrome wires in detail, and FIG. 8 shows the heating element 14 as an example. As described above, the heating element 14 (15) is wound around a winding frame 16 made of, for example, mica made of a rectangular flat frame, and the upper and lower sides thereof are sandwiched between insulating plates 17 and 18 also made of mica. Accordingly, the heating chamber 13 is attached to the outer surface of the upper wall and the outer surface of the bottom wall of the heating chamber 13 (the heating element 15 side is vertically symmetric with respect to this).

Therefore, in this case, the heating elements 14, 15
Are respectively connected to the heating chamber 1 via the insulating plate 17 on the heating chamber 13 side.
3 comes into contact with the outer surface of the upper wall portion and the outer surface of the bottom wall portion. However, the contact of the insulating plate 17 with the outer surface of the upper wall portion and the outer surface of the bottom wall portion of the heating chamber 13, and the generation of heat on the insulating plate 17. The contact between the bodies 14 and 15 was uncertain, and non-contact portions with the contact partner were formed in some places or almost entirely, and the heating chamber 13 could not be efficiently heated.

Further, the contact of the heating elements 14 and 15 with the insulating plate 17 is based on one point at a time in the cross section orthogonal to the direction in which the heating elements 14 and 15 extend. Was slight. For these reasons, a heat insulating material 20 is further provided on the back side of each of the heating elements 14 and 15.
(See FIG. 7) to prevent the heat of the heating elements 14 and 15 from escaping to the outside (to the maximum extent possible toward the heating chamber 13). I was coming.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and therefore has as its object to provide a heating chamber having a heating element for heating and cooking outside the heating chamber without increasing the cost. It is an object of the present invention to provide a cooking device capable of efficiently heating.

[0011]

In order to achieve the above object, in a heating cooker according to the present invention, a heating chamber for accommodating an object to be heated and a heating element for heating the heating chamber from the outside are provided. A groove is formed on the outer surface of the wall of the heating chamber with the formation of a ridge projecting inward of the heating chamber, and the heating element is inserted into the groove in a close contact with the groove as a rod. It is characterized by having done.

According to this structure, the heating element is rod-shaped and is inserted into the groove on the outer surface of the wall of the heating chamber in a state of being in close contact with the wall of the heating chamber. Will come in contact. The back side of the groove is a ridge projecting inward of the heating chamber, and the ridge can reinforce the wall of the heating chamber. Therefore, even if the thickness of the wall of the heating chamber is reduced, the thickness of the wall can be reduced. By reducing the thickness, the heat generated by the heating element can be transmitted to the heating chamber even more.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a microwave oven with a heater will be described below with reference to FIG. First, FIG. 2 shows the entire configuration of a microwave oven with a heater. An inner box 22 is disposed inside an outer box 21, and a heating chamber 23 is formed by the inner box 22.

The inner box 22 is composed of a side plate 24, an upper plate 25, and a bottom plate 26, as shown in detail in FIG. Among them, the side plate 24 is formed by bending a metal plate such as an iron plate, which is a single heat conductive material, into a U-shape to integrally have a rectangular rear surface portion and the same rectangular left and right side surface portions. The upper plate 25 is a rectangular plate closing the open portion on the upper surface of the side plate 24, and the bottom plate 26 is a rectangular plate closing the open portion on the lower surface of the side plate 24. It is formed of a metal plate.

The side plate 24, the upper plate 25, and the bottom plate 26 are walls of the heating chamber 23. The rear surface of the side plate 24 is a rear wall, the left side is a left side wall, and the right side is a right side. The upper plate 25 functions as an upper wall portion, and the bottom plate 26 functions as a bottom wall portion. The peripheral portions are integrated by welding.

Further, plate receivers 27 and 28 are provided on the inner surfaces of the left and right side walls of the side plate 24 at upper and lower two stages, and both of these plate receivers 27 and 28 are formed in a bead shape extending forward and backward. I have. Further, an opening 29 is provided in the upper part of the right side wall of the side plate 24.
The side plate 2 is formed so as to surround the opening 29.
A waveguide 30 is mounted on the outer surface of the right side wall portion of 4, and a magnetron 31 (see FIG. 2) as a microwave oscillator is mounted on the lower outer surface of the waveguide 30. As a result, at the time of microwave cooking, microwaves emitted from the magnetron 31 are supplied from the opening 29 to the inside of the inner box 22, that is, to the heating chamber 23 through the waveguide 30.

On the other hand, grooves 32 and 33 are formed in the upper plate 25 and the bottom plate 26, respectively. These grooves 32, 33
Are formed on the outer surfaces of the upper plate 25 and the bottom plate 26 (the upper plate 25 is on the upper surface and the bottom plate 26 is on the lower surface) as shown in FIG. Projecting ridges 34 and 35 are formed. That is, the groove 3
Reference numerals 2 and 33 are formed on the back side by forming projections 34 and 35 projecting inward of the heating chamber 23, respectively.
Each of the grooves 32 and 33 and the ridges 34 and 35 has a substantially semicircular cross section. The grooves 32, 33
The projections 34 and 35 are formed by press working.

On the other hand, a heating element 36 for heating and cooking is used.
Reference numeral 37 denotes a rod-shaped member, which is not shown in detail, but both are made of a sheathed heater in which a heating tube such as a nichrome wire is inserted into a metal tube having a circular cross section, and an insulating powder such as magnesia is filled around the tube. For each outer diameter, the grooves 32, 33 define an inner diameter approximately equal to them.
As shown in FIG. 3, the heating elements 36 and 37 are bent into smaller rectangular shapes in accordance with the shapes of the upper plate 25 and the bottom plate 26 of the inner box 22, and the grooves 32 and 33 are formed.
The ridges 34, 35 are also formed in the same shape.

In this configuration, the heating element 36 is inserted into the groove 32, the heating element 37 is inserted into the groove 33, and approximately half of each outer peripheral surface thereof (the heating element 36 is approximately the lower half, 37 is approximately the upper half of the groove 32, 33 in close contact with the inner peripheral surface of the groove 32, 33 (see FIG. 1).

The heating element 3 for the grooves 32, 33
After the insertion of the holding plates 38, 39, the holding plates 38, 39
And fixing them to the upper plate 25 and the bottom plate 26 by screws 40 and 41, respectively, so that the grooves 32,
The heating elements 36, 37 are prevented from coming off from 33. The holding plates 38 and 39 have holes 4 respectively.
2 and 43 are formed, and the outlets 36a and 37a of the heating elements 36 and 37 are led out of the outlets 42 and 43. The upper plate 25, the bottom plate 26, and the heating element 36
And the heating element 37, the holding plate 38 and the holding plate 39, and the screw 40.
The screw 41 and the screw 41 are the same parts, and are used upside down to facilitate manufacture and assembly.

In addition, FIG. 3 partially shows a front plate 44 to be attached to the front opening portion of the outer box 21. The front plate 44 has an object entrance / exit 45 and a panel mounting opening 46 arranged side by side. The inner box 2 assembled with the side plate 24, the upper plate 25, and the bottom plate 26 as shown in FIG.
2, and an operation panel 47 (not shown in detail) for various operations for heating and cooking is mounted on the panel mounting opening 46. Further, the heated object entrance 45
, A door 48 is provided.

FIGS. 4 and 5 show a cooking dish 49, which is formed in a shallow-bottom rectangular container shape from a metal plate such as an iron plate, which is a good heat conducting material, and has a peripheral portion around it. The dish tray 2 when housed in a portion above the bottom surface of the heating chamber 23
A groove 50 is formed on the outer surface (lower surface) of the bottom surface of the bottom plate 26 so as to fit with the ridge 35 on the back side of the groove 33 of the bottom plate 26 in the same shape (rectangular shape). Is formed. Note that the groove 51 is also formed on the back side (bottom upper surface side) by forming a ridge 52.

Further, in the wall of the heating chamber 23, the groove 3
A coating layer 53 having a self-cleaning action is provided on the inner surfaces of the upper and
Is formed. The coating layer 53 having a self-cleaning action is made of a self-cleaning enamel mainly using manganese dioxide and aluminum oxide as main catalysts, and has high-temperature heat resistance capable of withstanding high heat of 500 to 600 [° C.] or more. ing. Further, a coating layer 54 made of a material having a high slip property is formed on the inner surface of the side plate 24 which is a wall other than the wall in which the grooves 32 and 33 are formed. And its heat-resistant temperature is 300 ° C. or lower.

Now, in the case of the configuration as described above,
The heating cooking by the heating elements 36 and 37 is performed by storing an object to be heated (not shown) placed on a cooking dish 49 in the heating chamber 23 and causing the heating elements 36 and 37 to generate heat. The heating elements 36 and 37 are both rod-shaped, and are inserted into grooves 32 and 33 formed on the upper surface of the upper plate 25 and the lower surface of the bottom plate 26, which are the outer surfaces of the walls of the heating chamber 23, respectively, so as to be in close contact with each other.
As a result, the heating elements 36 and 37 are in direct contact with the wall of the heating chamber 23 more reliably and more directly than in the prior art, and the contact area is further increased. Therefore, the heating chamber 23 can be heated more efficiently than the conventional one.

On the back side of the grooves 32, 33 are ridges 34, 35 projecting inward of the heating chamber 23.
The walls (the upper plate 25 and the bottom plate 26) of the heating chamber 23 can be reinforced by the components 4, 35. Therefore, the wall portion of the heating chamber 23 can be reduced even if the plate thickness is temporarily reduced. By reducing the plate thickness, the heat generated by the heating elements 32 and 33 is more effectively transmitted into the heating chamber 23. Therefore, in this case, the heating chamber 23 can be heated more efficiently.

Further, the configuration required in these cases is such that the grooves 32, 33 and the ridges 34,
Since only the 35 is formed, there is no need for an extra heat insulating material 20 unlike the conventional one, so that an increase in cost can be avoided. Further, the heating elements 36 and 37 are also inserted into the grooves 32 and 33 so as to be positioned at regular positions, thereby facilitating assembly.

On the other hand, as shown in FIG. 5, with respect to the heating element 37 inserted into the groove 33 formed on the outer surface (lower surface) of the bottom plate 26, a ridge on the back side (inside the heating chamber 23) of the groove 33 is provided. The cooking dish 49 can be placed on the 35 in a state of direct contact. Accordingly, rapid heating or high-heat heating can be performed by directly applying the heat of the heating element 37 to the object to be heated placed on the cooking dish 49. For example, a hamburger or a steak that browns the surface of the object to be heated, Cooking such as okonomiyaki can be performed well.

In this case, a groove 51 is formed on the bottom surface of the cooking dish 49 which is in contact with the ridge 35, so that the cooking dish 49 and the ridge are formed. By increasing the contact area with the portion 35, rapid heating and high heating power of the object to be heated can be more effectively performed. In addition, the fitting of the grooves 51 and the ridges 35 allows the cooking dish 49 to be stably disposed at the bottom of the heating chamber 23, thereby eliminating rattling and the like. By the ridge 52 on the back side, the cooking dish 49 can be reinforced,
Deformation during high heat cooking can be prevented.

The inner surfaces of the left and right side walls of the heating chamber 23 are provided with upper and lower trays 27 and 28, respectively, and the cooking tray 49 can be selectively placed on these trays. When the cooking dish 49 is laid on the upper tray tray 27, the object to be heated is brought close to the upper heating element 36, and grilling of grilled fish or the like to be grilled by the heat can be conveniently performed. On the other hand, when the cooking dish 49 is laid on the lower tray tray 28, the object to be heated is separated from the upper heating element 36 and approached to the lower heating element 37, and the roast beef and the roast bean are heated by the heat over time. Oven cooking of chicken, cake, cream puff, etc. can be done conveniently.

Further, the groove 3 is formed in the wall of the heating chamber 23.
The inner surfaces of the upper plate 25 and the bottom plate 26 which are the walls on which the heat generating elements 3 and 2 are formed are respectively formed in the grooves 32 and 33.
By installing 6,37, 500-
The temperature is raised to about 600 ° C. For this reason, even after heating, the temperature does not decrease quickly, and it is necessary to work so that the hands do not touch them when cleaning to wipe off dirt attached to them, which is troublesome and troublesome. Have difficulty.

In this respect, in the above configuration, the coating layer 53 having a self-cleaning action is formed on those surfaces, and the adhered dirt is naturally removed by the coating layer 53. It is not necessary to wipe each time, and it is convenient and convenient to work without touching the hot surface.

On the other hand, in the wall of the heating chamber 23, the groove 3
On the inner surface of the side plate 24, which is a wall other than the wall formed with 2, 33, the heating elements 36, 37 are not provided outside, so that the temperature is raised only up to about 250 to 300 [° C.] during heating and cooking. After cooking, the temperature quickly drops. Therefore, the cleaning to wipe off the dirt attached to them can be performed without worrying about touching them, and the coating layer 54 made of a highly slippery material is formed here. Therefore, the adhered dirt has good releasability, and the user can wipe it off as desired.

In this case, the coating layer 53 having a self-cleaning action is more expensive than the coating layer 54 made of a material having a high slip property. However, since the formation of the expensive coating layer 53 is limited only to the surface where the temperature becomes extremely high during the heating and cooking as described above, the increase in cost is further suppressed in accordance with the arrangement structure of the heating elements 36 and 37. be able to.

Further, the surface on which the coating layer 53 having the self-cleaning action is formed is the inner surface of the side plate 24 in the case of the above-described structure, and the inner surface of the side plate 24 is more contaminated with dirt scattered from the object to be heated. Therefore, by forming the coating layer 53 having a self-cleaning action here, cleaning by the user can be more effectively performed.

In the above embodiment, the present invention is applied to a microwave oven with a heater. However, the present invention is not limited to this, and the present invention can be similarly applied to an electric oven having no microwave oven function. Further, the heating element may be provided only on the bottom plate 26 of the inner box 22 or may be provided on the side plate 24.

Further, the inner box 22 may have the rear surface of the side plate 24 and the left and right side surfaces separately, or may have the rear surface of the side plate 24 and the upper plate 25 and the bottom plate 26 integrally.
The left and right side portions may be separately provided, and the combination may be set as appropriate. In addition, upper plate 2
Although the fifth and bottom plates 26, the heating element 36 and the heating element 37, the holding plate 38 and the holding plate 39, and the screws 40 and 41 are the same parts in the above embodiment, they may be separate parts.

[0037]

The present invention is as described above.
The following effects are obtained. According to the cooking device of claim 1,
In a heater having a heating element for heating and cooking outside the heating chamber, the heating element can be reliably and directly brought into contact with the wall of the heating chamber with an increased contact area. Since the heat generated by the heating element can be transmitted to the heating chamber better by reducing the plate thickness, the heating chamber can be efficiently heated without increasing the cost.
Further, the heating element can be easily assembled.

According to the heating cooker of the second aspect, rapid heating or high heating power by directly applying the heat of the heating element to the object to be heated placed on the cooking dish can be desired. Claim 3
According to the heating cooker described above, rapid heating and high heat heating of the object to be heated can be performed more effectively, and the cooking dish can be stably arranged at the bottom of the heating chamber.

According to the heating cooker of the fourth aspect, the cleaning function and the cleaning assisting function can be appropriately obtained according to different temperatures depending on the arrangement of the heating elements around the heating chamber, which can be convenient and increase the cost. It can be less.

[Brief description of the drawings]

FIG. 1 is an enlarged vertical sectional front view of a main part showing an embodiment of the present invention.

FIG. 2 is an overall vertical front view.

FIG. 3 is an exploded perspective view of a main part.

FIG. 4 is a perspective view including a main part of a cooking dish.

FIG. 5 is a longitudinal sectional front view of a cooking dish placing portion in a main portion.

FIG. 6 is a diagram corresponding to FIG. 2 showing a conventional example.

FIG. 7 is a diagram corresponding to FIG. 2, showing a different conventional example.

FIG. 8 is an exploded perspective view of a heating element.

[Explanation of symbols]

22 is an inner box (wall portion of the heating chamber), 23 is a heating chamber, 24 is a side plate (rear wall portion, left side wall portion, right side wall portion), 25 is an upper plate (upper wall portion), and 26 is a bottom plate (bottom wall portion). Parts), 32 and 33 are grooves, 3
Reference numerals 4 and 35 denote projecting portions, 36 and 37 denote heating elements, 49 denotes a cooking dish, 51 denotes a groove, 52 denotes a projecting portion, 53 denotes a coating layer having a self-cleaning action, and 54 denotes a coating made of a material having high slipperiness. Show layers.

Claims (4)

[Claims] 1. A heating apparatus comprising: a heating chamber for accommodating an object to be heated; and a heating element for heating the heating chamber from the outside thereof. A heating cooker, wherein a groove is formed along with the formation of the ridge, and the heating element is inserted into the groove in a tightly-closed state. 2. A groove is formed on at least the outer surface of the bottom wall of the heating chamber, and the cooking dish is placed in direct contact with the ridge on the inside of heating. The cooking device according to claim 1. 3. The heating cooker according to claim 2, wherein a groove is formed on a bottom surface of the cooking dish in contact with the ridge, the groove being fitted with the ridge. 4. A coating layer having a self-cleaning action is formed on an inner surface of a wall portion having a groove of a heating chamber, and a coating layer made of a highly slippery material is formed on an inner surface of the other wall portion. The heating cooker according to claim 1, wherein