JPS6322422Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a heating cooking device for heating and cooking an object, and particularly relates to a temperature control device in an oven during heating of this heating cooking device.

[Purpose of invention]

(Prior Art) Generally, a heater of this type of heating cooking device is installed in an oven (cooking chamber), and this heater is formed of a long meandering heating wire. An electric heating wire or the like is used as the heating wire of the heater. To cook using such a heater, first, the food to be cooked is placed in the oven and the heater is energized. Then, the cooked food is heated and cooked by the heat generated from the heater. Steam and mist generated by heating the cooked food are discharged to the outside air through an exhaust duct connected to the oven. In this case, a heat sensitive element such as a thermistor is provided in the exhaust duct, and the ambient temperature inside the oven is detected by the heat sensitive element. Then, the heat generated from the heater is controlled based on the detected temperature. This makes it possible to arbitrarily select a cooking temperature depending on the cooked food or the cooking method.

(Problem to be solved by the invention) However, conventionally, the heater of this type of heating cooking device uses heating means focused on the center of the oven based on the arrangement of the food to be cooked. The temperature distribution also became uneven. Therefore, a discrepancy occurs between the baked state of the cooked food and the temperature detected by the heat-sensitive element, making it impossible to properly control the temperature, which may cause problems in the finished cooking. Furthermore, while cooked food is directly heated by the radiant heat of the heater, the heat-sensitive element
Since it is installed in the exhaust duct, it does not effectively transfer the radiant heat of the heater, and is in an indirect detection state, which detects changes in the temperature rise of the cooked food and changes in the temperature detected by the heat-sensitive element. There is a risk that the correspondence relationship with

The present invention has been developed in view of the above-mentioned circumstances, and allows cooked food to be heated uniformly, as well as by having a heat-sensitive element accurately transmitting and receiving radiant heat from the heater to detect it. The purpose of the present invention is to provide a heating cooking device that can control the temperature.

[Structure of the idea]

(Means for Solving the Problems and Their Effects) In the present invention, an oven frame body is formed within a casing to separate the oven and the machine room, and approximately W. A shaped heater is installed horizontally, an exhaust hole is bored in a part of the top plate, an exhaust duct is attached to the top plate where the exhaust hole is located, and a heat-sensitive element is placed in the exhaust duct of the heater. The heater is attached so as to be located directly above the intermediate heating wire portion, and is configured so that the heat-sensitive element accurately detects the radiant heat of the heater.

(Example) Hereinafter, an example in which the present invention is applied to a high frequency heating device having an oven function will be described in detail based on the drawings.

As shown in FIGS. 1 and 2, the casing 1 has a box shape, and the casing 1 is provided with an oven frame 20 that is divided into an oven 2 and a machine room 3. As shown in FIGS. The oven 2 and machine room 3
is communicated with through a ventilation duct 4. In the machine room 3, there are provided a magnetron 5 that generates electromagnetic waves, a high voltage transformer (not shown), a blower 6 that supplies cooling air to these, and the like.

Further, a box-shaped waveguide 7 is provided on the ceiling plate 2a of the oven frame 20, and the waveguide 7 guides the electromagnetic waves generated by the magnetron 5 into the oven 2. .

Further, inside the oven 2, a heater 8 consisting of a long meandering heating wire is installed on the ceiling plate 2a.
The heater 8 is installed approximately parallel to the heater 8, and by using this heater 8, it is possible to brown the cooked food. The heater 8 is formed of two end heating wire portions 8a, 8a having a substantially U-shape having a long side and a short side, and an intermediate heating wire portion 8b formed in a straight line. The heating wire portions 8a, 8a are arranged so that their short sides are substantially parallel to each other and facing each other. The ends of the short sides are integrally formed by the intermediate heating wire portion 8b. In this case, the end heating wire portions 8a, 8a
The short side and the intermediate heating wire portion 8b intersect at a substantially right angle. Further, the tips of the long sides of the end heating wire portions 8a, 8a are connected to a
It is inserted into two sockets 9,9.

Furthermore, as shown in FIG. 1, the length W ₁ of the intermediate heating wire portion 8b is larger than the distance W ₂ between the long side and the short side of the end heating wire 8a.

That is, W ₁ >W ₂ , and in this embodiment, W ₁ is approximately twice as large as W ₂ . In this way, the heater 8 is formed into a substantially W shape.

Further, the ceiling plate 2a of the oven frame 20 is provided with a plurality of exhaust holes 11 that communicate the inside and outside of the oven 2. This exhaust hole 11 is arranged directly above the linear intermediate heating wire portion 8b. Further, an exhaust duct 12 is fixed around the exhaust hole 11, and the exhaust duct 12 covers the exhaust hole 11. Further, the outer end of the exhaust duct 12 communicates with an exhaust port 13 formed in the rear plate of the casing 1.

Further, inside the exhaust duct 12, a heat-sensitive element 14 made of, for example, a thermistor is provided. This heat-sensitive element 14 is provided in a protruding manner on a support box 15 attached to the outer surface of the exhaust duct 12, and extends downward through a mounting hole (not shown) provided through the exhaust duct 12. It is prominent.

This heat-sensitive element 14 is connected to the exhaust hole 11.
It is located directly above the That is, the intermediate heating wire portion 8b of the heater 8 is connected to the exhaust hole 1.
It is located directly below the heat-sensitive element 14 via 1.

It is convenient to adopt a structure in which a control circuit for receiving signals generated by the heat-sensitive element 14 is provided in the support box 15, since a simple temperature control structure can be obtained. Further, as shown in FIGS. 3 and 4, the support box 15 is connected to the exhaust duct 1 by screws 16.
2 is tightened and fixed. That is, the support box 15 is provided with a plurality of fixing holes 15a, and the exhaust duct 12 is provided with screw holes 17. In this embodiment, the screw hole 17 is formed by burring.

Then, the support box 15 is arranged at a position where the fixing hole 15a and the screw hole 17 almost match, and the screw 16 is inserted from above the fixing hole 15a toward the screw hole 17, and the screw 16 is driven with a screwdriver 18. The support box 15 is fixed to the exhaust duct 12 by tightening.

In this case, as shown in FIG.
7 is formed into a conical tapered slope 19,
The screw hole 17 is arranged at the bottom of the recess formed by the tapered slope 19. In this way, even if the position of the fixing hole 15a of the support box 15 and the position of the screw hole 17 are slightly shifted, the screw 1
6 into the fixing hole 15a, the tip of the screw 16 comes into contact with the tapered slope 19 and slides down toward the screw hole 17, so the support box 15 cannot be placed in the correct position. The screw 16 can be tightened even if the

In the heating cooking device having the above configuration, when cooking using the heater 8, first,
Place the cooked food in oven 2. Next, heater 8
Turn on the switch to generate heat from the heater 8.

This heat is mainly radiated and conducted to the cooked food to heat the cooked food to a high temperature, thereby cooking the food. In this case, in the heating wire of the heater 8, the length of the intermediate heating wire portion 8b is long and the center portion is wide apart, so that the heating action is not biased toward the center of the oven 2, and the cooked food is almost uniformly heated. It is heated and cooked. Furthermore, the temperature distribution within the oven 2 is also approximately uniform. Steam and mist are generated from the cooked food during cooking, and the steam and mist flow through the oven 2 by convection or the like.
Exhaust port 1 passes from exhaust port 11 to exhaust duct 12
3 is discharged to the outside.

On the other hand, the radiant heat generated from the heater 8 is transferred to and detected by the heat-sensitive element 14 through the exhaust hole 11 arranged directly above the intermediate heating wire portion 8b.
Since the heat sensitive element 14 is placed in substantially the same heating condition as the entire food being cooked in the oven 2, the heat sensitive element 14 can detect the same temperature as the food being cooked in the oven 2.

[Effect of idea]

As described above, in the present invention, an oven frame is formed inside a casing to separate the oven and a machine room, and a substantially W-shaped heater is installed horizontally in the oven near the top plate of the oven frame. , an exhaust hole is bored in a part of the top plate, an exhaust duct is attached to the top plate where the exhaust hole is located, and a heat-sensitive element is placed in the exhaust duct directly above the intermediate heating wire portion of the heater. Since the heat-sensitive element and the whole cooked food are heated under almost the same conditions, and the temperature change between them is also almost the same, even when cooking is done by rapid heating, the cooked food can be easily heated. It is possible to accurately detect temperature changes using a heat-sensitive element, and the temperature of the cooked food can be closely related to the detected temperature, dramatically improving the temperature response or reliability of the heat-sensitive element. Therefore, it has the effect of making the cooking condition extremely good.

[Brief explanation of the drawing]

1 and 2 are a plan view and a side view of a heating cooking device according to an embodiment of the present invention, and FIG. 3 is a perspective view showing a state in which a support box for a heat-sensitive element is attached.
FIG. 4 is a sectional view of a screw for attaching the support box shown in FIG. 3 and a screw hole for attaching the screw. 2...Oven, 2a...Ceiling plate, 8...Heater, 8a...End heating wire section, 8b...Intermediate heating wire section, 11...Exhaust hole, 14...Heating element, 15...
...Support box.

Claims (1)

[Scope of utility model registration request] An oven frame body is formed inside the casing to separate the oven and the machine room, and a substantially W-shaped heater is installed horizontally in the oven near the top plate of the oven frame body, and a part of the top plate is provided with an exhaust gas. A hole is bored, an exhaust duct is attached to the top plate where the exhaust hole is located, and a heat-sensitive element is attached to the exhaust duct so as to be located directly above the intermediate heating wire portion of the heater. A heating cooking device.