JPH0118976Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Technical Field of the Invention] The present invention relates to a cooking device such as an oven or a microwave oven having an oven function, and particularly relates to an improvement in the mounting structure of a thermistor for controlling the temperature inside the oven chamber. [Technical background of the invention] Microwave ovens and high-end ovens equipped with an oven function have traditionally been equipped with a thermistor to control the temperature inside the oven chamber. FIG. 1 schematically shows a conventional microwave oven 1 equipped with an oven function, in which a duct-shaped air distribution path 4 is opened in the upper wall 3 of an oven chamber 2, and a thermistor 5 is installed in this air distribution path 4. was installed to detect the temperature of the exhaust air. [Problems in the Background Art] However, in the configuration in which the thermistor 5 is disposed in the air distribution path 4 as described above, there is a difference between the temperature in the central part of the oven chamber 2 and the temperature in the air distribution path 4. It is not possible to accurately control the temperature inside 2,
In addition, since the air distribution path 4 opens at the rear of the microwave oven 1, if there is a wall W near the rear of the microwave oven 1 as shown in the figure, the exhaust air will be poor and the sensitivity of the thermistor 5 will be reduced. This causes the heater to turn off too late or too early, and the temperature inside the oven chamber 2 does not reach the desired set temperature. [Purpose of the invention] An object of the present invention is to provide a cooking device that eliminates the drawbacks of the conventional devices described above and allows accurate temperature control within the oven chamber. [Summary of the invention] According to the invention, a thermistor facing into the oven chamber is installed vertically on the upper wall of the oven chamber near the door, and in front of this thermistor is an oven front plate extending downward from the thermistor. This is achieved by directly detecting the temperature inside the oven chamber using a thermistor. [Embodiments of the invention] The invention will be described below with reference to embodiments shown in the drawings. 2 and 3 show a first embodiment of the present invention, and this embodiment shows a microwave oven 11 equipped with a heater. However, transformers, magnetrons, waveguides, starvation tubes, etc. are not shown because they are not directly related to the gist of the present invention. In these figures, a door 13 that can be opened and closed is attached to the front surface of a microwave oven main body 12, and a lower panel 14 is stretched over the main body 12 below this door 13. Inside the main body 12, the door 13 is provided.
An oven chamber 15 is formed which is opened and closed by. This oven chamber 15 has an upper wall 16 and a lower wall 1.
7, an end wall 18 and both side walls (not shown), and an air distribution path 19 is opened at the rear side of the upper wall 16. An upper heater 20 and a lower heater 21 are disposed in the oven chamber 15, and a thermistor 22 facing the oven chamber 15 is housed in a glass tube (not shown) on the upper wall 16 of the oven chamber 15 near the door 13. It is installed vertically. This thermistor 22
is for detecting the temperature inside the oven chamber 15, and the heaters 20 and 21 are controlled on/off according to the temperature inside the oven chamber 15 detected by this thermistor 22, and the temperature inside the oven chamber 15 is set to the set temperature. It is becoming more and more controlled. The thermistor 22 is installed at a location farther from the air distribution path 19 and the red-hot part of the heater 20, and not far from the center of the oven chamber 15. Then,
As shown in FIG. 4, the thermistor 22 is located at the center of the upper heater 20 in the left-right direction. In front of the thermistor 22, the main body 12
An oven front plate 24 integrally formed with the front plate 23 of the oven chamber 15 is vertically disposed so as to cover the upper part of the front opening 25 of the oven chamber 15. The vertical length A of the oven front plate 24 from the oven chamber upper wall 16 is the vertical length B of the thermistor 22 in the oven chamber 15.
It is made longer so that the thermistor 22 is hidden from the front of the oven chamber 15. Further, this oven front plate 24 is connected to the upper heater 20.
It has sufficient dimensions to hide the Next, the operation of the embodiment described above will be explained. When the upper heater 20 and lower heater 21 are heated, the temperature inside the oven chamber 15 increases, but not all of the heat from both heaters 20 and 21 is involved in heating the food, and some of the heat is transferred to the air distribution path 19. , it will leak from the gap between the door 13 and the like. This leakage of heat generates wind in the oven chamber 15, but if the thermistor 22 is exposed to this wind, the temperature detected by the thermistor 22 will not be accurate due to the influence of the wind. However, in this embodiment, since the oven front plate 24 is located in front of the thermistor 22, no wind passing through the thermistor 22 is generated. Therefore, the thermistor 22 is not affected by the wind and is accurately positioned in the oven chamber 1.
The average temperature within 5 can be detected. Also,
Since the thermistor 22 is disposed at the center of the upper heater 20 in the left-right direction, it receives the radiant heat of the upper heater 20 uniformly from the left and right sides, so that the average temperature in the oven chamber 15 can also be detected from this point of view. I can do it. Therefore, the set temperature 250 as shown in Figure 5
°C, the variation in the maximum and minimum temperatures for each of the 5 on/off cycles, and the average difference between the maximum and minimum temperatures are:

[Table], allowing much more accurate control than conventional methods. Note that by disposing the thermistor 22 at the center of the upper heater 20 in the left-right direction, the operation panel 26
The length of the lead wire 27 from the to the thermistor 22 can also be shortened. In addition, like the conventional one described above, the air distribution path 1
Even if the thermistor 22 is placed inside the 6th
As shown in the figure, if a baffle plate 29 is arranged in the air distribution path 19 near the punching part 28 from which the wind flows to the outside, and a thermistor 22 is provided inside this baffle plate 29, the thermistor 22 It is less susceptible to the effects and has improved detection accuracy compared to conventional methods. [Effects of the invention] As explained above, the cooking apparatus according to the invention has an oven chamber that is opened and closed by a front door, and an upper heater is disposed near the upper wall of the oven chamber. A thermistor facing into the oven chamber is installed vertically on the upper wall near the door, and an oven front plate extending downward from the thermistor is installed in front of the thermistor, so that the thermistor is protected from the influence of wind inside the oven chamber. The temperature inside the oven chamber can be detected without being affected by the temperature, and therefore the temperature inside the oven chamber can be accurately controlled.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a conventional cooking device, and FIG. 2 is a perspective view showing an embodiment of the cooking device according to the present invention.
3 is a longitudinal cross-sectional view of both sides of FIG. 2, FIG. 4 is a cross-sectional plan view of FIG. 2, FIG. 5 is a graph showing the temperature inside the oven chamber, and FIG. FIG. 11...Microwave oven, 12...Main unit, 13...
Door, 15... Oven chamber, 20... Upper heater, 2
1... lower heater, 22... thermistor, 24...
Oven front board.

Claims (1)

[Claims for Utility Model Registration] 1. In a cooking device having an oven chamber that is opened and closed by a front door and an upper heater disposed near the upper wall of the oven chamber, an oven is installed on the upper wall near the door. A cooking device characterized in that a thermistor is provided vertically facing into a room, and in front of the thermistor, an oven front plate is provided that extends downward from the thermistor. 2. The cooking apparatus according to claim 1, wherein the thermistor is vertically disposed on the upper wall of the oven chamber at the center of the upper heater in the left-right direction.