JPH035628A - High frequency heat cooking device having heater - Google Patents

Abstract

PURPOSE:To improve the heating efficiency by inclining and curving the reflector plate to extend downwardly and outwardly and projecting the tubular casing in the through-hole for heater beyond the rim of said through-hole so that the high frequency waves may be prevented from leaking from the through-hole for heater without narrowing the effective heat generating zone of upper heater. CONSTITUTION:The reflector plate 18 is formed by drawing a sheet metal to protrude upwardly and sidewardly, and its lengthwise sides 19a and the adjacent sides 19b are inclined to extend downwardly and outwardly. The corners 19c, 19d joining the sides 19a, 19b are also drawn to have a curvature so that the concentration of electric field may be avoided. A through-hole 21 for heater is formed in the sides 19a of the reflector plate 19, and an upper heater 22 is inserted in the through-hole horizontally. The tubular section 24 that surrounds the through-hole 21 is formed by drawing a sheet metal, and its flange 24a is fixedly attached to the rim of the through-hole 21 in the reflector plate 19 from outside so that the tubular section 24 protrudes outwardly from the reflector plate 19. The heat is thus reflected to foodstuff on the turning tray 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Application Field) The present invention relates to a high-frequency heating cooking device with a heater, which is equipped with a tubular upper heater in the upper part of a heating cooking chamber.

(Prior Art) Conventionally, this type of high-frequency heating cooking device with a heater has a case-shaped reflector plate 3 so as to form a heater storage space 2 on the upper surface of a heating cooking chamber 1, as shown in FIG. 4, for example. were fixed and formed on both left and right side surfaces of this reflector plate 3. A tubular upper heater 5 passes through the heater through hole 4, and both ends of the upper heater 5 are supported by support members (not shown) outside the reflector plate 3. In order to prevent leakage of high frequency waves from the heater through hole 4, a cylindrical high frequency attenuator 6 is installed inside the heater through hole 4, and both sides of the upper heater 5 are covered by the high frequency attenuator 6. ing.

(Problem to be Solved by the Invention) However, the high frequency attenuator 6
If the high-frequency attenuator 6 covers the part covered with the high-frequency attenuator 6, the radiant heat of the upper heater 5 will be blocked, so the effective heat generation area of the upper heater 5 will be narrowed and the heating efficiency will deteriorate.

Moreover, since both the left and right sides of the reflector plate 3 stood vertically, heat and high frequency waves were not reflected downward from these surfaces.
Also from this point of view, there is a drawback that heating efficiency is reduced.

The present invention has been made in consideration of these circumstances, and therefore, its purpose is to provide a heater that can prevent high frequency leakage from the heater through hole portion without narrowing the effective heat generation area of the upper heater, and improve heating efficiency. To provide a high frequency heating cooking device.

[Structure of the Invention] (Means for Solving the Problems) The high-frequency heating cooking device with a heater of the present invention includes a magnetron for high-frequency heating of food in a heating cooking chamber, and a horizontally elongated heater stored in the upper surface of the heating cooking chamber. A case-like reflector provided to form a space, and a tubular upper heater penetrated by heater through holes formed on both longitudinal sides of the reflector, wherein Both sides in the longitudinal direction and surfaces adjacent thereto are inclined or curved so as to expand downward and outward, and a cylindrical part surrounding the heater through-hole is provided at the periphery of the heater through-hole so as to face outward. It has a protruding structure.

In this case, it is preferable that the cylindrical portion is formed so that the gap between the tip of the cylindrical portion and the upper heater is uniform over the entire circumference.

(Function) Both longitudinal sides of the reflector and the adjacent surfaces are sloped or curved so as to expand downward and outward, so that heat and high frequency waves are reflected downward toward the food being cooked on these surfaces. be able to.

Moreover, the cylindrical part provided outward at the periphery of the heater through-hole functions similarly to a conventional high-frequency attenuator, preventing leakage of high-frequency waves, and also allows the cylindrical part to prevent leakage of high-frequency waves. There is no need to narrow the heat generating area of the upper heater, and in combination with the above-mentioned reflection effect, heating efficiency can be improved.

In this case, if the gap between the tip of the cylindrical portion and the upper heater is formed to be uniform over the entire circumference, the high frequency attenuation effect of the cylindrical portion will be further enhanced, and leakage of high frequency waves can be more reliably prevented.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

First, in FIG. 3 which shows a longitudinal sectional front view of the whole (the outer box is not shown), 11 is an inner box whose inside is a heating cooking chamber 12. A rotating plate 14 is provided. This rotating plate 14
Rollers 15 are provided at multiple locations on the outer periphery of the inner box 11, and these rollers 15 move on the bottom plate of the inner box 11. Further, a lower heater unit 16 is disposed on the bottom plate of the inner box 11. On the other hand, a waveguide 17 is attached to the right side of the inner box 11, and a magnetron 18 is attached to the waveguide 17.
is fixed. Reference numeral 19 denotes a reflector plate attached to the center of the upper surface of the inner box 11 by welding or the like. This reflector plate 19 is formed by drawing a metal plate, and protrudes upward and extends in the left and right directions as shown in FIG. It is formed to extend, and both side surfaces 19a in the elongated direction (left-right direction) and a surface 19b adjacent thereto are inclined so as to expand downward and outward. In this case, the corner portion 19c of each surface 19a, 19b
, 19d is also R-shaped (rounded shape) by drawing.
This prevents the electric field from concentrating on the corner portions 19c and 19d. The heater storage space 20 inside the reflector 19 is formed by a rectangular opening 1 on the top surface of the inner box 11.
It is open into the heating cooking chamber 12 through 1a. Heater through holes 21 are formed in both left and right side surfaces 19a of the reflecting plate 19, and an upper heater 22 passes through the heater through holes 21 so as to extend left and right. The upper heater 22 is a glass tube heater in which a coiled heater wire 22b is housed in a glass tube 22a made of crystallized glass. It is inserted into and supported by the support tube portion 23a. Reference numeral 24 denotes a cylindrical portion surrounding the heater through hole 21, which is also formed by drawing a metal plate, and has a peripheral flange portion 24a.
is fixed to the periphery of the heater through hole 21 of the reflector plate 19 from the outside by welding or the like, so that the cylindrical part 24 is attached to the reflector plate 1.
It is projected outside of 9.

In this case, as shown in FIG. 1, by forming the upper part of the cylindrical part 24 to be parallel to the upper heater 22,
The cylindrical part 24 is formed so that the gap between its tip and the upper heater 22 is uniform over the entire circumference.

The reason why the lower part of the cylindrical part 24 is not formed parallel to the upper heater 22 is that it is difficult to form an acute angle (less than 90') between the peripheral flange part 24a and the cylindrical part 24 in drawing forming. This takes into account the fact that

According to the present embodiment described above, since the cylindrical portion 24 that partially covers both end portions of the upper heater 22 protrudes outward, the heat generating area of the upper heater 22 inside the reflector plate 19 is not narrowed. Therefore, the heat generating area of the upper heater 22 can be expanded compared to the conventional one. Moreover, since both side surfaces 19a in the left and right direction of the reflecting plate 19 and the surface 19b adjacent thereto are inclined so as to expand downward and outward, these surfaces 19a, 19b
In this case, heat can be reflected toward the food to be cooked on the rotary plate 14 below, and together with the above-mentioned expansion of the heat generating area, heating efficiency can be improved, contributing to power saving.

Moreover, the cylindrical portion 24 provided outward at the periphery of the heater through-hole 21 acts in the same manner as the conventional high-frequency attenuator described above, and suppresses the high-frequency waves that tend to leak through the heater wire 22b of the upper heater 22. It can be attenuated inside the shaped portion 24 and leakage of high frequencies can be prevented.

In particular, as in the above embodiment, if the cylindrical portion 24 is formed so that the gap between its tip and the upper heater 22 is uniform over the entire circumference, the high frequency attenuation effect of the cylindrical portion 24 is further enhanced. This makes it possible to more reliably prevent high frequency leakage. Note that when the cylindrical portion 24 is simply drawn (when the entire circumference of the cylindrical portion 24 is formed perpendicular to the peripheral flange portion 24a), the gap between the tip and the upper heater 22 is larger on the upper side. It will be in an open state.

Further, in the above embodiment, each surface 19a, 19 of the reflection plate 19
The corner portions 19c and 19d of b are also formed into an R shape (
Since the corner portions 19c and 19d are formed in a rounded shape, electric fields can be prevented from concentrating on the corner portions 19c and 19d, and high frequency waves can be reflected well in these portions.

In the above embodiment, the cross-sectional shape of the reflection plate 19 is approximately trapezoidal, but it is not limited to this, and may be pentagonal, hexagonal, other polygonal, semicircular, or curved. In short, each surface 19a, 19b of the reflection plate 19 may be formed to be inclined or curved so as to expand downward and outward.

In addition, the present invention is not limited to the above-mentioned embodiment, and various modifications are possible, for example, the support structure of the upper heater 22 may be changed.

[Effects of the Invention] As is clear from the above description, the present invention inclines or curves both longitudinal side surfaces of the reflector and the surfaces adjacent thereto so as to expand downward and outward, and also allows the heater to pass through. Since the cylindrical part surrounding the heater through-hole is formed protruding outward on the periphery of the hole, the effective heat generation area of the upper heater inside the reflector can be expanded compared to the conventional one, and the Each surface can reflect heat and high frequency waves toward the food being cooked below, ensuring improved heating efficiency.

Furthermore, the cylindrical portion provided outward at the peripheral edge of the heater through-hole functions similarly to a conventional high-frequency attenuator, thereby preventing leakage of high-frequency waves.

In this case, if the gap between the tip of the cylindrical portion and the upper heater is formed to be uniform over the entire circumference, the high frequency attenuation effect of the cylindrical portion will be further enhanced, and leakage of high frequency waves can be more reliably prevented.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention,
FIG. 1 is an enlarged longitudinal sectional front view of the main part, FIG. 2 is a partial enlarged perspective view of the reflector, and FIG. 3 is a longitudinal sectional front view of the cooking chamber. FIG. 4 is a vertical sectional front view of the upper part of the heating cooking chamber showing a conventional example. In the drawing, 11 is an inner box, 12 is a heating cooking chamber, 14 is a rotating plate, 16 is a lower heater unit, 18 is a magnetron, 19
1 is a reflection plate, 20 is a heater storage space, 1 is a heater through hole, 22 is an upper heater, and 24 is a cylindrical portion.

Claims (1)

[Claims] 1. A magnetron that heats food in the heating cooking chamber with high frequency; a case-shaped reflector plate provided on the upper surface of the cooking chamber to form a horizontally elongated heater storage space; and both sides of the reflector in the longitudinal direction. and a tubular upper heater penetrated by a heater through hole formed in the surface, wherein both longitudinal side surfaces of the reflector and the surface adjacent thereto are inclined or expanded downwardly and outwardly. A high-frequency heating cooking device with a heater, characterized in that the heater through-hole is curved and has a cylindrical portion surrounding the heater through-hole protruding outward from the periphery of the heater through-hole. 2. Claim 1, wherein the cylindrical part is formed so that the gap between the tip and the upper heater is uniform over the entire circumference.
The described high-frequency heating cooking device with a heater.