JP3679669B2 - Cooking equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooking device provided with a magnetron and a heater, and more particularly to a cooking device of a type in which a heater cannot be disposed on the bottom surface of a heating chamber.
[0002]
[Background Art and Problems to be Solved by the Invention]
Some conventional cooking devices include a magnetron and a heater as heating means, such as an oven microwave oven. In such a cooking device, the magnetron and the heating chamber are connected by a waveguide. And the microwave which the magnetron oscillated is supplied to a heating chamber via a waveguide. The connecting portion of the heating chamber with the waveguide is covered with a plate having a low dielectric loss so that dust, food juice or the like does not enter the waveguide. In such a cooking device, the heater is mounted on the heating chamber.
[0003]
Some conventional cooking devices have heaters above and below the heating chamber in order to perform heater heating more powerfully.
[0004]
Some conventional cooking devices connect the heating chamber to the waveguide at the bottom. This is because the microwave generated by the magnetron is uniformly supplied into the heating chamber.
[0005]
However, in the conventional cooking device, there has been a problem when the microwave is uniformly supplied into the heating chamber and the heater is heated strongly. As described above, when the microwave is to be supplied uniformly into the heating chamber, the waveguide is connected to the bottom surface of the heating chamber. That is, a waveguide is provided below the heating chamber. And it is because it is difficult to provide a heater below the heating chamber here for reasons such as thermal efficiency.
[0006]
Accordingly, it has been proposed that when the waveguide is connected to the bottom surface of the heating chamber and microwaves are supplied to the heating chamber from the bottom surface, the heater is strongly heated from the entire back surface of the heating chamber. Such a heating cooking apparatus will be described with reference to FIG. FIG. 7 is a rear view of a main body frame portion of a conventional cooking device.
[0007]
A heating chamber is provided inside the main body frame 100. The main body frame 100 includes a back surface 101 that constitutes the rear surface of the heating chamber. The back surface 101 is provided with a heater 102 for heating the heating chamber from the rear over the entire top, bottom, left and right. The back surface 101 is provided with a fan 103 for efficiently guiding the heat radiated from the heater 102 to the heating chamber.
[0008]
However, in such an example, in the heating chamber, the vicinity of the back surface inevitably becomes a high temperature exceeding the temperature required for cooking by heating, even temporarily. This is because heat necessary for heating the entire heating chamber is generated at a stretch in the vicinity of the back surface of the heating chamber. This leads to the following problems.
[0009]
As described above, the connection portion of the heating chamber with the waveguide is covered with a plate body having a low dielectric loss (hereinafter abbreviated as a low dielectric plate). When the low dielectric plate constitutes the bottom surface of the heating chamber, the periphery of the low dielectric plate is sealed with silicon or the like so that juice or the like does not leak out of the heating chamber. Such a sealing material such as silicon has a property of being vulnerable to heat. Accordingly, as described above, when the vicinity of the back surface of the heating chamber becomes a high temperature exceeding the temperature required for cooking, the sealing material located near the back surface is cured and the sealing performance is lost. Arise.
[0010]
In other words, as described above, in the conventional cooking device, it has been difficult to heat the heater strongly after supplying microwaves uniformly into the heating chamber.
[0011]
The present invention has been conceived in view of such circumstances, and an object of the present invention is to provide a cooking device that can uniformly supply microwaves into a heating chamber and can perform heater heating strongly.
[0012]
[Means for Solving the Problems]
The heating cooking apparatus according to the present invention as set forth in claim 1 is provided inside the body frame, accommodates food, and has a rear surface formed with a plurality of exhaust holes at the center and a plurality of intake holes at the bottom. A chamber, a bottom plate that is provided at the bottom of the heating chamber for placing food, the periphery is sealed with a sealing material such as silicon, and made of a material with low dielectric loss, and a magnetron that oscillates microwaves A waveguide having one end connected to the magnetron and the other end connected to the bottom surface of the main body frame below the heating chamber , and the magnetron provided via the waveguide, provided below the heating chamber. A rotating antenna for diffusing the microwaves and supplying the heating chamber to the heating chamber via the bottom plate, and a linear heater mounted on the plane above the heating chamber. To heat And one of the heater, and housed in a case member and the casing member is formed of a tube heater comprising a heating element wound helically, the bottom plate around the seal timber is suppressed in the output can be avoided to cure A second heater that mainly heats a lower portion of the heating chamber; a fan that sends air heated by the second heater into the heating chamber; and a second heater that is attached to the rear of the heating chamber, A heater unit that houses the fan provided above the second heater, and the heater unit rotates the fan to transfer the air heated by the second heater to the rear surface of the heating chamber. feed from the intake hole in the lower portion within the heating chamber, characterized in that it mainly heat the bottom of the heating chamber.
[0013]
According to the first aspect of the present invention, the microwave oscillated by the magnetron is supplied into the heating chamber from the bottom surface of the heating chamber. Regarding the heater heating, the upper part of the heating chamber can be heated by the first heater, and the lower part of the heating chamber can be heated by the second heater. The second heater is attached to the rear of the heating chamber.
[0014]
Thereby, regarding the heater heating, the upper and lower portions of the heating chamber can be efficiently heated, and a part of the heating chamber can be heated while avoiding reaching a high temperature exceeding the temperature required for cooking. It is not necessary to provide the second heater below the heating chamber, and it is not necessary to provide a heater only on the rear surface of the heating chamber and to heat the entire heating chamber only from the rear of the heating chamber as in the prior art. is there. Therefore, even when the sealing material is present at the connection portion between the heating chamber and the waveguide, it is possible to avoid curing the sealing material. Furthermore, regarding heating by a magnetron, microwaves can be uniformly supplied to the heating chamber from the bottom surface thereof. That is, in the cooking device, microwaves can be supplied uniformly into the heating chamber and the heater can be heated strongly.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Below, the microwave oven which can be oven-cooked which is one embodiment of this invention is demonstrated, referring drawings. FIG. 1 is a perspective view of a microwave oven.
[0016]
With reference to FIG. 1, a microwave oven 1 mainly includes a main body 2 and a door 3. The main body 2 is covered with an exterior part 4 at its outer shell. An operation panel 6 is provided on the front surface of the main body 2 so that the user can input various information to the microwave oven 1. The main body 2 is supported by a plurality of legs 8.
[0017]
The door 3 is configured to be openable and closable with the lower end as an axis. A handle 3 a is provided on the upper portion of the door 3. In FIG. 2, the front view of the microwave oven 1 which looked at the microwave oven 1 when the door 3 was made into the open state from the front is shown.
[0018]
A body frame (a body frame 5 described later) is provided inside the body 2. A heating chamber 10 is provided inside the main body frame 5, and a front plate 50 is provided on the front surface of the main body frame 5. A hole 10 a is formed in the upper right side of the heating chamber 10. A detection path member 40 is connected to the hole 10 a from the outside of the heating chamber 10. A bottom plate 9 is provided at the bottom of the heating chamber 10. The bottom plate 9 is preferably made of a material having high heat resistance and strength and low dielectric loss.
[0019]
A food is placed on the bottom plate 9. The periphery of the bottom plate 9 is sealed with silicon 99 so that food juice or the like does not spill below the bottom plate 9.
[0020]
Guides 10b and 10c are formed on the right side of the heating chamber 10, and guides 10d and 10e are formed on the left side. The guides 10b, 10c, 10d, and 10e are formed to support a heating dish (not shown) at the upper stage or the lower stage in the heating chamber 10. Specifically, the heating pan is set at the upper stage in the heating chamber 10 by supporting the right end thereof with the guide 10b and the left end thereof with the guide 10d. Further, the heating pan is set at the lower stage in the heating chamber 10 by being supported by the guide 10c at the right end and the guide 10e at the left end. The guides 10b, 10c, 10d, and 10e are formed by pressing the corresponding portions of the side surface of the heating chamber 10 in the main body frame 5 from the outside of the heating chamber 10, respectively. Moreover, the heating dish said here is a heating dish used at the time of oven cooking in a general microwave oven.
[0021]
FIG. 3 is a front view of the microwave oven 1 with the exterior portion 4 removed. An opening 51 for opening the heating chamber 10 and a hole 52 for fitting the operation panel 6 are formed in the front plate 50. Various parts such as a magnetron 12 on the lower right side of the heating chamber 10 are attached to the main body frame 5. In order to explain the structure of these components, FIG. 4 shows a front view of the microwave oven 1 with the front plate 50 further removed from the state shown in FIG. 5 is a right side view of the main body frame 5, and FIG. 6 is a left side view of the main body frame 5.
[0022]
3 to 6, the magnetron 12 includes a magnetron antenna 12a. The magnetron 12 is connected to one end of the waveguide 19. The magnetron antenna 12 a is located inside the waveguide 19. The other end of the waveguide 19 is connected to the bottom surface of the main body frame 5 and below the heating chamber 10.
[0023]
A rotating antenna 15 is provided below the heating chamber 10. A motor 17 is provided below the rotating antenna 15 and below the waveguide 19. The motor 17 and the rotating antenna 15 are connected by a shaft 16 penetrating the waveguide 19. When the motor 17 is driven, power is transmitted by the shaft 16 and the rotating antenna 15 rotates. In the microwave oven 1, the microwave oscillated by the magnetron 12 is supplied into the heating chamber 10 through the waveguide 19 so as to be diffused by the rotating antenna 15.
[0024]
As described above, one end of the detection path 40 is connected to the hole 10 a of the heating chamber 10. An infrared sensor 7 is attached to the other end of the detection path 40. The infrared sensor 7 has a visual field in the heating chamber 10. Thereby, the infrared sensor 7 can detect the temperature of the food in the heating chamber 10 via the detection path 40. In addition, a plurality of small holes are formed on the side surface of the detection path 40 so that the lens portion of the infrared sensor 7 is not fogged by the vapor generated by the food.
[0025]
An upper heater 13 is provided on the main body frame 5 and above the heating chamber 10. The upper heater 13 is configured by placing a linear heater on a flat surface and covering it with plate-like asbestos from above and below. The upper heater 13 is covered with a heater cover 13a.
[0026]
A heater unit 140 is provided on the main body frame 5 and behind the heating chamber 10. The lower heater 14 is housed in the lower part of the heater unit 140. A fan 14 a is provided in the heater unit 140 and above the lower heater 14.
[0027]
A plurality of intake holes 41 are formed in the lower portion of the rear surface of the heating chamber 10. Further, on the rear surface of the heating chamber 10, above the intake holes 41, a plurality of intake holes 42 are formed on the left side, a plurality of exhaust holes 43 are formed in the center, and a plurality of intake holes 44 are formed on the right side. The intake holes 41, 42, 44 and the exhaust hole 43 are all small holes having a diameter of about 3 to 5 mm.
[0028]
As the lower heater 14 dissipates heat, the air near the lower heater 14 is heated. The heated air is sent to the lower part of the heating chamber 10 through the intake holes 41, 42 and 44 as the fan 14a rotates. Air is sent to the fan 14a through the exhaust hole 43.
[0029]
A plurality of convex portions 45 are formed on the rear surface of the heating chamber 10. The convex portion 45 is formed by pressing the main body frame 5. As shown in FIG. 4, the convex portion 45 is omitted so that the convex portion 45 can be distinguished from the intake holes 41, 42, 44 and the exhaust hole 43.
[0030]
In the microwave oven 1 described above, the food in the heating chamber 10 can be heated by the magnetron 12 oscillating microwaves. The microwave oscillated by the magnetron 12 is supplied into the heating chamber 10 from the bottom surface of the heating chamber 10 through the bottom plate 9.
[0031]
In the microwave oven 1, the upper heater 13 mainly heats the upper part of the heating chamber 10, and the lower heater 14 mainly heats the lower part of the heating chamber 10. The output of the upper heater 13 is 900 W, for example, and the output of the lower heater 14 is 450 W, for example. As described above, since the heater that mainly heats the upper part of the heating chamber 10 and the heater that mainly heats the lower part are provided, in the microwave oven 1, even if the output of the lower heater 14 is suppressed to 450 W, the heating chamber 10. The whole can be heated sufficiently.
[0032]
Generally, a sealing material such as silicon 99 that seals the periphery of the bottom plate 9 is cured when the temperature exceeds 250 to 270 ° C. In the microwave oven 1, the output of the lower heater 14 is suppressed to about 450 W, so that the silicon 99 (particularly the portion located behind the heating chamber 10) can be avoided from being cured. The heat radiated from the lower heater 14 is efficiently guided into the heating chamber 10 by the fan 14a.
[0033]
Although not shown in the microwave oven 1, a control circuit for overall control of the operation of the microwave oven 1 is provided behind the operation panel 6. The control circuit includes a microcomputer and controls operations of various components such as the magnetron 12, the upper heater 13, the lower heater 14, the fan 14a, the motor 17, and the infrared sensor 7.
[0034]
The control circuit can intermittently supply power to the lower heater 14 so as to repeat “35 seconds on, 5 seconds off”. In addition, the control circuit controls the amount of heat radiated per unit time of the lower heater 14 by adjusting the time for supplying power to the lower heater 14 (the above-described number of seconds for turning on the lower heater 14). can do.
[0035]
As described above, in the microwave oven 1, the heating dish can be set in the upper stage or the lower stage in the heating chamber 10. That is, the position of the food in the height direction can be defined in the heating chamber 10. Further, the amount of heat radiated by the lower heater 14 can be adjusted according to the position in the height direction of the food.
[0036]
If it demonstrates concretely, the user can input into the operation panel 6 the setting position (upper stage or lower stage) of a heating pan at the time of heater heating. The above control circuit is configured to lower the amount of heat radiated by the lower heater 14 when the upper stage is input as the setting position of the heating dish in the operation panel 6 than when the lower stage is input. The amount of power supplied to the lower heater 14 is controlled. Thereby, heater heating can be performed more efficiently.
[0037]
In the microwave oven 1, the lower heater 14 has a cylindrical shape as can be understood from FIGS. 4 to 6 (the lower heater 14 is omitted in FIG. 3). Specifically, the lower heater 14 is a so-called tube heater composed of a cylindrical case member and a linear heating element housed in a spiral shape (that is, in a coil shape). is there.
[0038]
The lower heater 14 is configured by storing a helically wound heating element in a case member, so that the case member is configured to store a linear heating element extending in the longitudinal direction of the case member. While increasing the heat generation amount per unit length of the lower heater 14, it is possible to suppress the risk of breakage. This is because the heat generating element generally has a higher risk of breakage as the amount of heat generated per unit increases. This is because if the heating element is wound and stored in a spiral shape, the heating element that can be stored in the case member per unit length can be made longer than storing the heating element in a straight line. In the microwave oven 1, the heating element is made of a metal wire such as a nichrome wire, for example. The case member is made of ceramic or quartz.
[0039]
In the present embodiment described above, the upper heater 13 constitutes a first heater, and the lower heater 14 constitutes a second heater. The guides 10b to 10e constitute height defining means. The control circuit provided at the rear of the operation panel 6 constitutes a heat amount adjusting means.
[0040]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[Brief description of the drawings]
FIG. 1 is a perspective view of a microwave oven according to an embodiment of the present invention.
FIG. 2 is a front view of the microwave oven of FIG.
3 is a front view of a main body frame portion of the microwave oven of FIG. 1. FIG.
4 is a front view of the microwave oven with a front plate removed from the state of FIG.
5 is a right side view of a main body frame portion of the microwave oven of FIG. 1. FIG.
6 is a left side view of a main body frame portion of the microwave oven of FIG. 1. FIG.
FIG. 7 is a rear view of a main body frame portion of a conventional cooking device.
[Explanation of symbols]
1 microwave oven, 5 body frame, 6 operation panel, 10 heating chamber, 10b to 10e guide, 12 magnetron, 13 upper heater, 14 lower heater, 14a fan, 15 rotating antenna, 19 waveguide.

Claims (1)

A heating chamber provided inside the main body frame for containing food, having a rear surface in which a plurality of exhaust holes and a plurality of air intake holes are formed in the center, and a bottom of the heating chamber for placing food A peripheral plate sealed with a sealing material such as silicon, a bottom plate made of a material with low dielectric loss, a magnetron that oscillates microwaves, one end connected to the magnetron, and the other end to the heating chamber A waveguide connected to the bottom surface of the main body frame below and a heating chamber provided below the heating chamber, diffusing microwaves of the magnetron that has passed through the waveguide, and through the bottom plate A rotary antenna that is supplied to the heating chamber, a linear heater that is mounted above the heating chamber on a flat surface, a first heater that mainly heats the upper portion of the heating chamber, a case member, and the case member Fit in And is constituted by a tube heater comprising a heating element wound helically, second heating the bottom of mainly the heating chamber is suppressed to output the bottom plate around the seal timber can be avoided to cure A heater, a fan for sending air heated by the second heater into the heating chamber, and a fan mounted behind the heating chamber and provided above the second heater and the second heater. a housing with a heater unit, the heater unit sends the air heated by the second heater by rotating the fan from the intake hole of the heating chamber rear in the lower portion within the heating chamber, mainly A cooking apparatus for heating a lower portion of the inside of the heating chamber.

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