JP2001340237A - Electromagnetic induction heating smoke-less roaster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic induction heating smokeless roaster which uses a ceramic of very small linear expansion coefficient as a material of an insulator, and has an air blow system which uniformly and efficiently blows the cooling air to a work coil and a smoke exhaust system. SOLUTION: The ceramic insulator 1 has a composition consisting of 65-75% silica (SiO2), 20-33% alumina (Al2O3) and 1.5-4% lithium oxide (Li2O). An electromagnetic induction heater 28 is installed in a box body 18 having the air blow circuit 46 connected to an air blow fan F, and the smoke exhaust circuit 29 not in contact with the box body 18 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a cooling air blowing circuit for a work coil, a smoke exhausting circuit for smoke generated during roasting, and a ceramic heat insulator having an extremely small linear expansion coefficient. The present invention relates to an electromagnetic induction heating type smokeless roaster incorporated in an electromagnetic induction heating device.

[0002]

2. Description of the Related Art A conventional electromagnetic induction heating type roaster disclosed in Japanese Patent No. 3016732 is known. In this proposal, radiant heat from the heating body to the work coil is cut off between the heating body and the work coil via a heat insulator. However, since the ceramic used for the heat insulator is made of silica or alumina, its coefficient of linear expansion is relatively large at 3.5 × 10 ⁻⁶ or more. Therefore, when the roaster is started, the temperature rises sharply and cracks and cracks are likely to occur in the heat insulator. Also, during roasting, sauce and food juice fall onto the heat insulator and partially cool rapidly. As a result, cracks and cracks may occur. Further, the cooling means for the work coil directly blows the wind from the blower fan to the work coil, so that the wind does not evenly hit the work coil and the blown air is dissipated, so that effective cooling cannot be performed. In addition, there is no means for exhausting smoke from foods generated during roasting cooking.

[0003]

In order to solve the conventional problems, the electromagnetic induction heating type smokeless roaster of the present invention employs a ceramic material having a very small coefficient of linear expansion as a material of the heat insulator. In addition, an air blowing circuit is provided for uniformly blowing air to the work coil without dissipating the air to the work coil. Another object of the present invention is to provide an electromagnetic induction heating type smokeless roaster provided with a smoke exhaust circuit.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, an electromagnetic induction heating type smokeless roaster of the present invention is characterized in that the composition of the ceramic insulator is 65% to 75% silica (SiO ₂ ) and alumina (SiO ₂ ). Al ₂ O ₃ ) from 20% to 33
%, And lithium (Li ₂ O) in a range of 1.5% to 4%. In addition, an electromagnetic induction heating tool was installed in a box having a blower circuit connected to a blower fan, and a smoke exhaust circuit not in contact with the box was provided.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an electromagnetic induction heating type smokeless roaster according to the present invention will be described with reference to FIGS. T is a table in which a smoke exhaust circuit 29 is installed in a central opening H thereof. As a method of installing the smoke exhaust circuit 29, a plurality of locking pieces 54 are projected from the upper part of the outer periphery of the smoke exhaust ring 4 constituting the smoke exhaust circuit 29, and are engaged with the edge of the opening H of the table T. The bottom of the body 2 may be supported by a receiving piece not shown.

[0006] The smoke exhaust ring 4 has an outer wall 55 and an inner wall 56.
And a ring-shaped body 52 having a groove-shaped cross section formed by a bottom plate 16 connecting the lower portions of the side walls 55 and 56, and a ring-shaped lid 53. The smoke suction hole 48 is provided on the inner side wall 56 of the annular body 52.
Is provided. In the present embodiment, a long hole-shaped one is exemplified. A plurality of smoke outlets 20 are provided on the bottom plate 16 of the annular body 52, and a cylindrical connecting portion 26 forming the smoke outlet 20 protrudes downward. The lid 53 projects the fitting piece 33 downward from the bottom surface near the outer peripheral end and the inner peripheral end. Lid 53 is attached to ring body 5
2, the fitting piece 33 is fitted and fitted to the inside of the outer wall 55 and the inside of the inner wall 56 of the ring body 52.

[0007] A flat U-shaped rectifying piece 36 is provided on the smoke exhaust port 20 of the smoke exhaust ring 4, and both side pieces abut against the inside of the inner side wall 56 of the annular body 52. In the present embodiment, the large and small rectifying pieces 36a and 36b are provided twice. Rectifying pieces 36a, 3
6b limits the amount of smoke sucked from the smoke suction holes 48 near the smoke outlet 20 and makes the amount of smoke from all the smoke smoke holes 48 uniform.
The rectifying pieces 36a and 36b can be provided on the back surface of the lid 53.

The smoke exhaust pipe 3 is fitted with the connecting portion 26 of the smoke exhaust ring 4 on the inner edge of the upper end 41 and the connecting portion 8 of the smoke collector 2 described below on the inner edge of the lower end 49. It is connected to the ring 4 and the smoke collector 2.

The smoke collection body 2 is divided into a smoke collection body 5 and a lid 6. The smoke collecting body 5 has a cylindrical shape with a bottom, and a cylindrical smoke outlet 7 projects downward at the center of the bottom. The smoke outlet 7 is connected to a smoke exhaust duct D connected to a smoke exhaust fan f (not shown). The lid 6 projects a plurality of cylindrical connecting portions 8 at the upper portion, and the inner edge of the lower end 49 of the smoke exhaust pipe 3 is fitted to the connecting portions 8. On the outer edge of the lid 6, a link-shaped connecting portion 10 that fits into the outer edge of the upper end 9 of the smoke collecting body 5 is formed.

A flat rectangular parallelepiped oil pan 11 having an opening 51 on the upper surface is provided on the lid 6 of the smoke collector 2. Both sides 12, 13 of this oil pan 11 and upper plate 14
A guide 15 is provided so as to wrap the oil pan 11 so that the oil pan 11 can be freely drawn in and out along the guide 15. A handle (not shown) is provided on the entrance side. The width of the guide 15 is set smaller than the inner width between the smoke exhaust pipes 3 so that the oil pan 11 can be pulled out as shown in FIG. The guide 15 is attached by attaching an end to a cabinet provided below the table T. (The illustration is omitted.) Further, an opening 17 communicating with the opening 51 of the oil pan 11 is provided in the center of the upper plate 14 of the guide 15.

A bottomed cylindrical box 18 is placed on the guide 15. The outer diameter of the box 18 is smaller than the inner diameter of the inner wall 56 of the smoke exhaust ring 4. A flange 19 is formed at the upper end of the outer wall 21 of the box 18. The flange 19 is provided with a plurality of through holes. The air outlet 22 and the air outlet 27 of the outer wall 21 are arranged between the smoke exhaust pipes 3 of the smoke exhaust ring circuit 29. Box 18
The stepped portion 24 is formed on the bottom surface 44 of the substrate, and the diameter is reduced further downward to provide the reduced diameter portion 25. Exhaust port 27 on outer wall 25 of reduced diameter portion
Is provided.

Note that rectifying plates P1 and P2 having substantially the same cross-sectional shape and the same size as the respective cross-sectional shapes are attached to the blower port 22 and the exhaust port 27 at an appropriate angle to the horizontal axis. The rectifying plates P1 and P2 may be provided with angle varying means.

Reference numeral 28 denotes an electromagnetic induction heating tool, which comprises a heating body 30, a heat insulator 1, and a work coil 31 disposed along the outer wall of the heat insulator 1 from the inside toward the outside.

The heating element 30 is formed in a funnel shape using a stainless steel sheet. A tubular portion 23 is provided at the center. The outer edge of the heating body 30 projects downward to form an upper flange 32. In addition, the lower flange 34 extends horizontally from the lower end of the central cylindrical portion 23.
To form

The heat insulator 1 is made of ceramic and has a composition of silica (SiO ₂ ) of 65% to 75%, alumina (Al ₂ O ₃ ) of 20% to 33%, and lithium (Li ₂
O) from 1.5% to 4%. The coefficient of linear expansion is extremely small, and a range of 0.5 × 10 ⁻⁶ to 3.0 × 10 ⁻⁶ is obtained. Incidentally, lithium-free alumina,
The linear expansion coefficient of the silica-based ceramic is 3.5 × 10 ^−6.
That is all. The heat insulator 1 is formed in the same funnel shape as the heating body 30. A flange 35 is provided on the outer edge. A cylindrical portion 37 is provided at the center.

The work coil 31 is disposed along the outer wall of the heat insulator 1, and its lower part is covered with the silicone rubber S for insulation. Electric wiring to the work coil 31 can be made directly from the power supply, between the smoke exhaust pipes 3 and 3, and through the box 18.

The heating element 3 is placed on the step portion 24 of the box 18.
An aluminum heat radiator 38 having a funnel shape similar to that of the heat radiator 0 and the heat insulator 1 is provided. A heat dissipating rib 39 is formed below the heat dissipating body 38. A ferrite 40 whose entire periphery is insulated with silicon rubber S is adhered to the upper surface of the heat radiator 38. Ferrite 4
The work coil 31 is set on the “0”. The flange 35 of the heat insulator 1 is placed on the flange 19 of the box 18, and the central cylindrical portion 37 of the heat insulator 1 is fitted into the center hole 42 of the annular portion 45 of the box 18. The outer edge 50 of the flange portion 35 is fitted to the inner periphery of the smoke exhaust ring 4. A set screw is inserted into a plurality of through holes provided in the flange portion 19 of the box body 18 and the flange portion 35 of the heat insulator 1, and a nut is screwed in for connection. The outer wall of the heat insulator 1, the inner periphery of the outer wall 21 of the box 18, the bottom surface 44,
The air passage 46 is formed by the annular portion 45.

The heater 30 is placed on the heat insulator 1. A space 43 is provided between the heating body 30 and the heat insulator 1 at an appropriate distance by the upper flange 32 and the lower flange 34 of the heating body 30.
Is formed. The outer edge of the wire mesh M or Rostor E is placed on the heating element 30, and roasting dishes are performed on the outer edge.

Next, the operation and effect of the electromagnetic induction heating type smokeless roaster according to the present invention will be described. When a main switch (not shown) is turned on and the work coil 31 is energized, the heating element 30 glows red in several minutes and reaches about 800 ° C. The air on the upper surface of the heating body 30 is heated by the heating body 30 that has become red, and rises, and the food is baked by the radiant heat from the heating body 30 and near-infrared rays, mid-infrared rays, and far-infrared rays.

When the main switch is turned on, the blower fan F also operates at the same time to start blowing. As shown in FIG. 1, the air blown from the blower fan F is blown by the rectifying plate P <b> 1 through the space between the heat insulator 1 and the work coil 31 and the radiator 3.
8 and a blow B directed toward the lower part. At this time, each of the airflows A and B joins in the reduced diameter portion 25 of the box 18 and is discharged from the exhaust port 27. Further, if the rectifying plate P2 is provided at the exhaust port 27, the amount of exhaust can be adjusted similarly to the rectifying plate P1 of the blowing port 22, and the internal pressure of the blowing circuit 46 can be increased, so that the work coil 31 can be evenly blown.

The heat dissipator 38 is made of aluminum and has a high thermal conductivity. Further, a heat dissipating rib 39 is provided below the heat dissipator 38 to increase the heat dissipating area. Prevent the coil 31 from overheating.

The ferrite 40 blocks the magnetic flux leaking from the work coil 31 and prevents heat generation from anything other than the heating element 30.

During the roasting cooking, the smoke exhaust fan f is operated, and the smoke generated from the food material is sucked into the smoke suction holes 48 of the smoke exhaust ring 4 and introduced into the smoke exhaust pipe 3, and further, the smoke collector 2 and is discharged outside through a smoke exhaust duct D from a cylindrical smoke exhaust port 7 at the center of the bottom of the smoke collector 2. In the flue gas duct D, a filter for removing oil, dust and the like, and a filtering device may be incorporated. In addition, the juice such as the oil of food dripping from the wire mesh M or the roast E during the roasting dish falls on the inclined upper surface of the heating body 30, then travels along the inner wall of the central cylindrical portion 37, passes through the opening 51 of the oil pan 11, and becomes water. Oil pan 1 filled with appropriate amount of W
Fall into one. In addition, the juice dripping from the outer edge of the wire mesh or the roaster also falls on the flange 35 of the heat insulator 1 and reaches the oil pan 11 along the upper surface of the inclined portion. In daily maintenance such as cleaning of appliances, the heating element 30 that is particularly easily contaminated is removed. Further, the oil pan 11 is taken out from the guide 15 and cleaned.

The cleaning of the smoke exhaust circuit 29 is performed by
The smoke exhaust pipe 3 and the smoke collector 2 are separated from each other by removing their respective connecting portions. Furthermore, the smoke exhaust ring 4 can be separated into a ring body 52 and a lid 53, and the smoke collector 2 can also be separated into the smoke collector 5 and the lid 6, so that cleaning can be performed reliably and easily.

[0025]

As described in detail above, according to the electromagnetic induction heating type smokeless roaster of the present invention, the composition of the ceramic heat insulator is made of a ceramic material having an extremely small coefficient of linear expansion. No cracks or cracks occur, and no cracks or cracks occur even if the juice of the food drops during roasting cooking and is locally quenched. In addition, since a circuit for blowing air to the work coil and a circuit for exhausting smoke generated from food materials are provided, a great effect in practical use, such as an abnormal rise in temperature of the work coil can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view of a main part of an electromagnetic induction heating type smokeless roaster of the present invention.

FIG. 2 is a plan view of the electromagnetic induction heating type smokeless roaster of the present invention.

FIG. 3 is a perspective view in which a part of a smoke exhaust circuit constituting the electromagnetic induction heating type smokeless roaster of the present invention is broken.

FIG. 4 is a central sectional view showing a main part of an embodiment of a heat insulator.

FIG. 5 is a bottom view of FIG. 4;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat insulator 2 smoke collector 3 smoke exhaust pipe 4 smoke exhaust ring 11 oil pan 28 electromagnetic induction heating tool 29 smoke exhaust circuit 30 heating element 31 work coil 46 ventilation circuit F ventilation fan H table center opening T table

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3K051 AB04 AB05 AB10 AB12 AC37 AD10 AD26 AD34 CD42 CD43 CD44 4B040 AA01 AA08 AB12 AC02 AC03 AE11 AE13 CA06 CA08 CA14 CA16 CB06 CB13 CB23 EB03 JA03 JA07 JA12 JA16 JA17 NA04 NA13 NA15

Claims (1)

[Claims] A blower circuit (4) for disposing an electromagnetic induction heating tool (28) inside and cooling a work coil (31).
6) An electromagnetic induction heating type smokeless roaster provided with a box (18) provided with a box (18) and a smoke exhaust circuit (29) in non-contact with the box (18), wherein the electromagnetic induction heating tool (28) From the inside toward the outside, a funnel-shaped heating element (30), a heat insulator (1) having the same shape as the heating element (30), and a work coil (31) provided along the outer wall of the heat insulator (1). ) Are arranged at appropriate intervals, and the heat insulator (1) comprises silica (SiO ₂ ) of 65% to 75% and alumina (Al
₂ O ₃₎ 33% 20%, an electromagnetic induction heating type smokeless roaster, characterized in that lithium _(Li 2 O) is made of ceramic which forms comprise 4% from 1.5%.