JPH0330726Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a cooking device that heats and cooks food using a heater.

[Conventional technology]

A so-called oven-type heating cooker has a heater installed in the cooking chamber, a thermostat connected to this heater, and this thermostat placed outside the cooking chamber, and uses its heat sensitive body to control the temperature inside the cooking chamber by convection air. Based on this sensing, the contact mechanism is opened and closed to control the energization of the heater, and through this control, the temperature in the cooking chamber is maintained at a set temperature that corresponds to the appropriate cooking temperature of the food to be cooked. .

[Problem that the invention attempts to solve]

However, in a configuration in which the thermostat is placed outside the cooking chamber and the temperature inside the cooking chamber is sensed by convective air, the actual temperature inside the cooking chamber and the operating temperature of the thermostat are different, as shown in Figure 8. During this period, a large deviation called H1 occurs, which means a lack of responsiveness, and this increases the fluctuation range L1 of the temperature inside the cooking chamber, which becomes a major hindrance to delicate cooking. An over-problem P occurs in which the temperature in the cooking chamber becomes much higher than the set temperature at startup, so you must wait until a certain period of time has passed and the temperature in the cooking chamber stabilizes to the set temperature before starting actual use. An unavoidable difficulty arose.

In order to keep the range of temperature fluctuations within the cooking chamber small, a slow opening/closing thermostat is sometimes used, but such slow opening/closing thermostats can cause radio interference when the contact mechanism opens and closes. There is a drawback that a large amount of noise is generated continuously.

Therefore, it may be possible to improve the response by directly exposing the heat sensitive element of the thermostat into the cooking chamber. However, the heat sensitive body of a thermostat is made of metal, and its surface exhibits a metallic luster, which makes it highly reflective of heat.As a result, there is a delay in sensing temperature changes in the cooking chamber, and the response is still insufficient. difficult to obtain.

In addition, if the thermostat's heat sensitive element is directly exposed in the cooking chamber, the surface of the heat sensitive body may become contaminated with oils and fats that are scattered during roasting of meat, fish, etc., and as a result, the shiny metallic surface may become dirty. The surface condition of the thermosensitive element at the initial stage, which exhibits the following properties, changes greatly when it is coated with oils and fats, and as a result, there is a large difference in the heat absorption and dissipation functions between the initial state and the state after oils and fats have been attached. This results in a large error between the actual temperature in the cooking chamber and the set temperature. One idea is to cover the heat-sensitive element with a cover as a countermeasure against the adhesion of fats and oils, but in this case, the heat shielding effect of the cover causes a decrease in response, and it is still difficult to properly control the temperature in the cooking chamber. I become confused. This invention aims to solve these problems.

[Means for solving problems]

In order to solve these problems, this idea is
The heat sensitive body of the thermostat is directly exposed in the cooking chamber, and at least the exposed portion thereof is coated with a dark colored coating layer.

[Effect]

The dark-colored coating layer made of self-cleaning paint applied to the heat sensitive element improves heat absorption and dissipation, and removes fats and oils that adhere to the heat sensitive body, ensuring the thermostat's responsiveness to temperature changes in the cooking chamber. stabilize.

〔Example〕

Examples of this invention will be described below.

A first embodiment is shown in FIGS. 1 to 4. In the figures, 1 is the main body of the heating cooker, and this main body 1 is constructed in the shape of a box with an open front. is rotatably mounted. Main body 1
The interior of the cooking chamber 3 is a cooking chamber 3, and within this cooking chamber 3, sheathed heaters 4, 4 each having a substantially rectangular shape are provided as heaters in upper and lower two stages. A temperature sensing section 5 is provided in a part. A thermostat 6 is disposed in the temperature sensing section 5, and this thermostat 6 is equipped with a rod-shaped heat sensitive body 7, which senses the temperature inside the cooking chamber 3, and in response to this sensing, the thermostat is activated. 6
opens and closes a contact mechanism (not shown) to control energization of the sheathed heaters 4, 4, and based on this control, the temperature in the cooking chamber 3 is maintained at the set temperature.

The thermostat 6 is covered with a cover 8, and the heat sensitive element 7 protrudes from the cover 8 and is exposed directly into the cooking chamber 3. A dark colored coating layer 9, for example a brown colored coating layer 9, is applied to the outer surface of the heat sensitive body 7 using a self-cleaning paint. The colored coating layer 9 made of this self-cleaning paint is made of methylphenyl silicone resin, a catalyst such as manganese dioxide (MnO _{2 ), silica powder (SiO 2 )} , magnesium oxide (MgO), and aluminum oxide (Al ₂ O ₃ ).
It is prepared by adding inorganic additives such as, and when it is applied and dried, the above-mentioned catalyst is scattered on the surface, forming a porous and rough surface. It has a self-cleaning function that decomposes oils and fats into gases such as CO ₂ and water vapor and purifies them by interacting with O ₂ in the air.

In addition, 10 is an operation part equipped with a temperature setting dial 11, etc., and 12... is a stepped part that supports a cooking mesh shelf (not shown) in the cooking chamber 3 in a detachable manner.

In such a configuration, the heat sensitive element 7 of the thermostat 6 is directly exposed in the cooking chamber 3, and therefore the sheathed heaters 4, 4 are connected to this heat sensitive body 7.
Heat is transferred quickly by convection and radiation with almost no time delay. A dark colored coating layer 9 is applied to the outer surface of the heat sensitive body 7, which suppresses the reflection of heat and absorbs heat when the temperature inside the cooking chamber 3 rises and when the temperature falls. Since the colored coating layer 9 is a self-cleaning paint and has a porous rough surface, it has a large heat receiving area and has excellent heat absorption properties. 7 accurately detects the temperature change in the cooking chamber 3 with only a small deviation of H2 as shown in FIG. The energization is controlled, and as a result, as shown in FIG. 4, the temperature in the cooking chamber 3 is maintained at an appropriate set temperature with a small fluctuation range of L2 from the beginning of startup. Therefore, use can be started immediately without requiring waiting time due to over-trouble. Further, there is an advantage that it is possible to use a quick opening/closing type thermostat 6 that generates less noise, instead of using a slow opening/closing type that generates noise.

Since the heat sensitive element 7 is directly exposed to the cooking chamber 3, fats and oils from roasting meat and fish adhere to the heat sensitive element 7, but the outer surface of the heat sensitive element 7 is coated with a colored self-cleaning paint. Since it is covered with the layer 9, the self-cleaning function of the self-cleaning paint in the colored coating layer 9 quickly and automatically removes the oils and fats, so it can be kept clean without having to clean it every time. The responsiveness of the thermostat 6 to temperature changes within the cooking chamber 3 can always be stabilized.

In addition, it is also possible to apply such a self-cleaning paint to the entire inner wall surface of the cooking chamber 3, or especially to the upper wall surface where oils and fats are likely to scatter.In this way, it is possible to suppress stains in the cooking chamber 3 and make it easier to clean. This is effective in that it can reduce the frequency of

FIG. 5 shows a second embodiment of this invention, in which the heat sensitive body 7 of the thermostat 6 is connected to an L-shaped heat transfer plate 7a.
and a box-shaped heat receiving plate 7b connected to one end of this heat transfer plate 7a, and the heat receiving plate 7b is connected to the cooking chamber 3.
The outer surface of the exposed heat receiving plate 7b is coated with a dark colored coating layer 9 made of self-cleaning paint. FIG. 6 shows a third embodiment, in which the heat sensitive body 7 is configured in an L shape, one end of the heat sensitive body 7 is exposed inside the cooking chamber 3, and the exposed end is provided with self-cleaning A dark colored coating layer 9 made of paint is applied, and the second and third embodiments also provide the same effects as the first embodiment.
Of course, the dark-colored coating layer 9 is not limited to being applied only to the exposed portion, but may be applied to the entire heat-sensitive member 7 without any problem. and colored coating layer 9
In addition to brown, the color tone may be black or dark purple.

Here, an example of a specific structure of the thermostat will be explained with reference to FIG. Reference numeral 7 denotes a heat sensitive body, and this heat sensitive body 7 is formed into a cylindrical shape from a metal material having a large coefficient of linear expansion, such as stainless steel, and a movable piece 15 is attached to the base end of this heat sensitive body 7. Inside the heat sensitive body 7, there is a core rod 16 made of a metal material with a small coefficient of linear expansion, such as amber.
One end of this core rod 16 is fastened and fixed to the tip of the heat sensitive element 7, and the other end is connected to the movable piece 15. In addition, a fixed contact plate 1 is provided near the movable piece 15.
7 and a movable contact plate 18 are provided, and a presser 15a at the tip of the movable piece 15 is disposed to face the tip surface of the movable control plate 18.

The movable piece 15 is pulled and curved due to the expansion difference between the heat sensitive element 7 and the core rod 16 depending on the temperature, and this curved deformation causes the movable contact plate 18 to be pressed by the presser 15a, and the movable contact plate 18a of the movable contact plate 18 is
is separated from the fixed contact 17a of the fixed contact plate 17,
Further, as the temperature decreases, the presser 15a separates from the movable contact plate 18, and the movable terminal 18a closes again to the fixed terminal 17a. and heat sensitive body 7
A dark colored coating layer 9 is applied to the outer surface of the holder. Note that 20 is an adjustment screw that displaces the fixed contact plate 17 and adjusts the opening/closing timing of the movable terminal 18a and the fixed terminal 17a depending on the temperature.

[Effect of idea]

As explained above, this invention has a simple structure in which the heat sensitive body of the thermostat is exposed in the cooking chamber, and at least the exposed portion of the heat sensitive body is coated with a dark colored coating layer made of self-cleaning paint. As a result, the responsiveness of the thermostat to the temperature in the cooking chamber can be reliably improved, and the temperature in the cooking chamber can be controlled appropriately and accurately at all times.

[Brief explanation of the drawing]

Figure 1 is an overall perspective view showing the first embodiment of this invention, Figure 2 is a perspective view of the main parts, and Figure 3 is a diagram showing the relationship between the temperature of the cooking chamber and the operating temperature of the thermostat. 4 is a curve diagram showing the temperature situation in the cooking chamber in comparison with the conventional one, FIG. 5 is a perspective view showing the second embodiment of this invention, and FIG. 6 is the same as the third embodiment. FIG. 7 is a sectional view showing an example of a specific structure of the thermostat.
FIG. 8 is a curve diagram showing the relationship between the temperature of the cooking chamber and the operating temperature of the thermostat in a conventional heating cooker. 3... Cooking chamber, 4... Heater, 6... Thermostat, 7... Heat sensitive element, 9... Colored coating layer.

Claims (1)

[Scope of utility model registration request] A heater is installed in the cooking chamber, a thermostat is connected to this heater, the temperature in the cooking chamber is sensed by the heat sensitive element of this thermostat, and the thermostat operates based on this sensing to control the energization of the heater to cook. 1. A heating cooker for maintaining a room at a set temperature, characterized in that the heat sensitive body is directly exposed in the cooking chamber, and at least the exposed portion thereof is coated with a dark colored coating layer made of self-cleaning paint.