JPH0144962Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a cooking device such as a high-frequency heating device that includes a heater heating mechanism in a heating chamber.

[Technical background of the invention and its problems]

2. Description of the Related Art Cooking devices that include a heater heating mechanism in a heating chamber of a high-frequency heating device and cook food by heating with a heater are in widespread use. This heating cooker has heaters disposed at the upper and lower parts of the heating chamber, and heats the food by applying electricity to the heater to cook food, such as bread or cake.

However, in the case of breads and cakes, the heating chamber becomes dry due to the heat of the heater, and the surface of the food becomes dry and hard, resulting in poor cooking quality.

Therefore, in order to eliminate the above-mentioned drawbacks, a cooking device with a steam heating mechanism that combines heater heating and steam heating is known.
This is constructed as shown in FIG. In other words, 1 is a main body, and inside this main body 1 is a heating chamber 2.
is provided, and heaters 3, 3 are installed in the lower part and lower part of this heating chamber 2, respectively. Furthermore, a steam generator 5 containing an electric heater 4 is provided outside the heating chamber 2 . and,
Water injected from the water tank 6 is stored in the steam generator 5, this water is heated by the electric heater 4 to generate steam, and this steam is spouted into the heating chamber 2 through the pipe 7. It is configured as follows.

Therefore, the structure of the heating cooker not only becomes complicated and large, but also causes an increase in cost.

[Purpose of invention]

This invention was made with attention to the above-mentioned circumstances, and its purpose is to automatically generate steam in the heating chamber when the temperature inside the heating chamber exceeds the set value, and to improve the structure. To provide a simple, inexpensive and highly reliable heating cooker.

[Summary of the idea]

In order to achieve the above object, this invention provides a water tank storage section for storing a water tank in the upper part of the heating chamber, and also provides a valve at the water inlet of the water tank.
When the temperature of the heating chamber exceeds a set temperature, a thermally responsive member senses this and opens the valve, thereby causing water droplets to drip into the heating chamber and generating steam.

[Example of idea]

An embodiment of this invention will be described below based on the drawings.

FIG. 1 schematically shows the entire heating cooker, and 11 is the main body. A heating chamber 12 is provided within the main body 11, and a front opening of the heating chamber 12 is opened and closed by a door body 13. A high frequency generator 15 is provided on the ceiling plate 14 of this heating chamber 12, and heaters 17, 17 that protrude from the upper and lower parts of the heating chamber 12 are attached to the back plate 16, forming a heater heating mechanism. ing. Furthermore, a placing plate 19 on which food 18 is placed is provided within the heating chamber 12 .

As shown in FIGS. 2 and 3, a water tank accommodating portion 20 is provided at the upper part of the main body 11 of the heating cooker constructed in this way. This water tank storage section 20 is constituted by a cylindrical cover 22 formed integrally with the top plate 21 of the main body 11. A small diameter communication path 24 is provided at the lower end of the cover 22 via a step 23.
The lower end of the heating chamber 12 is connected to the ceiling plate 14 of the heating chamber 12. A water tank 25 is detachably housed in the water tank housing section 20. The water tank 25 is provided with an opening 26 at the lower end, and a cap 28 having a water inlet 27 is attached to the opening 26. Furthermore, this cap 28 is provided with a valve 30 having a valve shaft 29, and the water inlet 2
7 to open and close. In other words, valve 30
When the water tank 25 is turned upside down, it falls under its own weight and closes the water inlet 27 to prevent water from dripping. In this state, the valve shaft 29 of the valve 30 hangs down through the communication passage 24, and the lower end of the valve shaft 29 passes through the opening 31 formed in the ceiling plate 14 and passes through the heating chamber 29. protrudes inward.
Further, a heating plate 33 is attached to the lower surface of the ceiling plate 14 via a bracket 32 so as to face the opening 31, and receives water droplets dripping by means to be described later, and generates steam on the upper surface of the heating plate 33. It's summery. Furthermore, a coil spring-shaped thermally responsive member 35 is provided in the communication passage 24 and is fitted onto the valve shaft 29 and whose lower end is supported by a stopper 34 . This thermally responsive member 35 is made of a shape memory alloy that expands and contracts depending on the temperature within the heating chamber 12. That is, the thermally responsive member 35 made of this shape memory alloy is an ii-based alloy, and its parent phase (high temperature phase) is formed in such a state that it expands and pushes up the valve 30, as shown in FIG. This shape memory alloy is plastically deformed at room temperature and compressed into a shape that separates it from the valve 30 as shown in FIG. In this state, the shape memory alloy undergoes martensitic transformation and forms a martensitic phase. The temperature at which the shape memory alloy starts to undergo reverse transformation from the martensitic phase to the parent phase is set at a temperature necessary to generate steam in the heating chamber 12.

Next, the operation of the heating cooker configured as described above will be explained. A water tank 25 containing water is stored in a water tank storage part 20. At this time, the temperature in the heating chamber 12 is at room temperature because no electricity is being applied to the heaters 17, 17, and the thermally responsive member 35 made of a shape memory alloy is in a martensitic phase, that is, in a compressed state. Therefore, as shown in FIG. 2, the valve 30 is lowered to close the water inlet 27. When the heaters 17, 17 are energized from this state to heat the food 18, the temperature of the heating chamber 12 rises and becomes dry. As the temperature of the heating chamber 12 rises, the hot plate 33 is also heated, so the temperature of the thermally responsive member 35 also rises. When the reverse transformation temperature is reached, the thermally responsive member 35 returns from the martensitic phase to the parent phase, expands as shown in FIG. 3, and pushes up the valve 30. Therefore, the water inlet 27 is opened, and the water in the water tank 25 drips from the water inlet 27, travels along the valve shaft 29, and drips onto the hot plate 33 from the opening 31. The dropped water droplets turn into steam on the hot plate 33 and prevent the interior of the heating chamber 12 from drying out. When the temperature of the thermally responsive member 35 falls below the set temperature due to contact with water droplets and a decrease in the temperature of the hot plate 33, the thermally responsive member 35 returns to the martensite phase and is compressed. Therefore, the valve 30 descends and closes the water inlet 27. By repeating this operation, the inside of the heating chamber 12 is kept in a constant humidified state, so that the food 18 can be prevented from drying out.

In the above embodiment, the thermally responsive member is made of a shape memory alloy, but it may be made of a bimetal, for example.

[Effects of the invention] As explained above, according to this invention, the temperature of the heating chamber is sensed during cooking using a heater, and when the temperature exceeds the set temperature, the water tank valve is automatically opened and water is poured from the water inlet. Since water droplets are dropped into the heating chamber to generate steam, it is possible to prevent the object to be heated from drying out while maintaining the temperature of the heating chamber.
In addition, it is structurally simple, can be provided at low cost, and has the advantage of improving reliability.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view of a heating cooker showing an embodiment of this invention, Figs. 2 and 3 are longitudinal side views for explaining the operation of the main parts, and Fig. 4 is a conventional steam generator. FIG. 2 is a longitudinal sectional front view of the heating cooker with mechanism. 12...Heating chamber, 17...Heater (heater heating mechanism), 20...Water tank storage section, 25...Water tank, 27...Water inlet, 35...Thermal response member.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A heating chamber having a heater heating mechanism, a water tank storage section provided in the upper part of this heating chamber, and a water tank stored in this water tank storage section and having a water inlet at the lower end. a tank, a valve provided in the water tank to open and close the water inlet, and a valve that responds to the temperature of the heating chamber and opens the valve when the temperature of the heating chamber reaches a set temperature or higher to allow water droplets to flow from the water tank into the heating chamber. A heating cooking device characterized by comprising a heat-responsive member that drips and generates steam. (2) The heating cooker according to claim 1, wherein the thermally responsive member is made of a shape memory alloy.