JPH0385115A - Electric heating vessel - Google Patents

Abstract

PURPOSE:To prevent drip from being attached on the lower surface side of a cover by covering the lower surface of an internal cover with a resin film having water- repelling property. CONSTITUTION:The lower surface of an internal cover 3 is covered with a resin film A having water-repelling property. As resin for forming the film A, the material of ethylene tetrafluoride resin is especially suitable, and this is excellent in the water- repelling property, heat resistance, oil resistance, impact resistance, chemicals resistance, peeling-off resistance, and the like, and durability can be secured in good order, and the material is sanitarily desirable. Water W condensed on the lower surface side of the internal cover 3 at the time of retaining heat is turned into one in the shape of a ball having a small area in contact with the resin film A, and before the ball-shaped one is grown larger, it is dropped, and so as a result, the quantity of the water W condensed on the lower surface of the internal cover 3 is reduced. Specially at the time of retaining the heat, the internal cover 3 is properly heated by a heat retaining heater 19 via an internal pot 14, and so a difference between an atmospheric temperature in the internal pot 14 and the temperature of the internal cover 3 is reduced, and condensation can be effectively prevented from being generated on the lower surface side of the internal cover 3.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electric heating container having a heat retention function, such as an electronic jar or a rice cooker.

<Prior art> Conventionally, as an electric heating container having the above-mentioned heat retention function, an inner container is provided inside an outer case, and an inner pot is removably housed in the inner container, and an inner pot is removably housed in the inner container. A lid unit is provided to cover the outer case, and an inner lid for closing the inner pot is removably attached to the lid unit.

In this type of electrically heated container, the inner lid is generally made of alumite-treated aluminum. Therefore, since dew tends to adhere to the bottom surface of the inner lid when keeping warm, a lid heater is installed near the mouth edge of the lid unit or inner pot, and this lid heater heats the inner lid to prevent dew condensation. things are being done.

<Problems to be Solved by the Invention> In the electric heating container described above, since the lid heater heats the inner lid without detecting the temperature of the inner lid, changes in room temperature, voltage fluctuations, etc. The lid may overcook or undercook. For this reason, for example, in rice cookers, etc., there is a problem that rice becomes hard or browns due to overheating of the inner lid. There has been a problem in that dew adheres to the lid and this dew drips onto the rice, causing what is called a white blur or causing the rice to rot.

In addition, when heating the inner lid with a lid heater,
There is a problem in that the mounting structure of the lid heater becomes complicated, and especially when the lid heater is installed in the lid unit, it is necessary to take measures to insulate against steam with packing etc., which increases the cost and increases the cost. Because it is necessary to draw the lead wire from the container body to the lid unit side,
The lead wires are repeatedly bent when the lid unit is opened and closed, and there is a problem in preventing wire breakage due to the bending.

An object of the present invention is to provide an electric heating container that can solve these problems all at once.

<Means for Solving the Problems> In an electrically heated container of the present invention for achieving the above objects, the lower surface of the inner lid is covered with a water-repellent resin film.

Effects> According to the electric heating container configured as described above, the water-repellent resin coating covering the lower surface of the inner lid prevents moisture from adhering to the lower surface of the lid during cooking or especially when keeping warm. It is possible to prevent dew from adhering to the lower surface of the lid as much as possible.

<Example> Hereinafter, embodiments will be described in detail with reference to the accompanying drawings showing examples.

FIG. 2 is a longitudinal cross-sectional view showing a rice cooker that also serves as an electric heating container and heat insulation. In the above rice cooker, the outer case 1 is
A cylindrical cover member 10 made of a thin metal plate, a synthetic resin bottom member 11 formed on the lower side of the cover member 10, and a synthetic resin formed on the upper side of the cover member 10. It is formed by a shoulder member 12 made of. Further, a lid unit 2 that closes the upper part of the outer case 1 is rotatably connected to the outer case 1 via a hinge mechanism 7 having a hinge bin 70 and the like. A locking mechanism 8 that can be secured to the outer case 1 is provided at a position facing the hinge mechanism 7.

A cylindrical inner container 13 is provided inside the outer case 1, and an inner pot 14 for cooking rice is removably accommodated in the inner container 13.

Further, a heat insulating heater 19 is provided on the outer periphery of the inner container 13, and a heat insulating material 15 is interposed between the inner container 13 and the cover member 10 to prevent heat radiation from the inner pot 14. There is. Furthermore, a center sensor 16 is provided in a penetration portion formed at the center of the bottom surface of the inner container 13, and a hot plate 17 is provided between the bottom surface of the inner pot 14 and the inner container 13. An annular rice cooking heater 18 that directly heats the inner pot 14 is embedded in the hot plate 17 so as to surround the center sensor 16 .

The lid unit 2 is formed into a hollow structure by an outer cover 20 made of synthetic resin provided on the outer surface side and an inner cover 21 made of synthetic resin provided on the inner surface side. Also,
A steam exhaust port 22 is provided approximately at the center of the lid unit 2, and a one-touch bottle attachment hole 5 is provided below the steam exhaust port 22. One-touch bin mounting hole 5
A rubber one-touch gasket 23 is attached to the. Further, below the lid unit 2, an inner pot 1 is provided.
An inner lid 3 is provided at the center of the bottom 30 of the inner lid 3 to allow steam introduced from inside the inner pot 14 to the upper part of the inner lid 3 through the steam hole 34 of the inner lid 3. One-touch bin 24 with built-in pressure regulator 4 for releasing to the outside
is fixed by a fixing member 25 such as a screw.

The pressure regulating device 4 is a so-called open-hole regulating valve type that can maintain pressure while constantly releasing steam little by little through the gap between the valve body 41 and the valve seat 40, and as the rice cooking process progresses, the steam temperature rises. Then, the shape memory alloy spring 42
expands, the valve body 41 is pushed up, and steam is released to the outside.

The inner M3 is removably attached to the lid unit 2 via a one-touch bottle 24 which is detachably attached to the one-touch gasket 23. Further, the space between the lid unit 2 and the inner lid 3 is sealed by a gasket 21a attached to the inner cover 21 to prevent steam from leaking outside from the pressure regulating device 4.

FIG. 1 is a sectional view showing the details of the main part of the inner lid 3, which is entirely made of a material with high thermal conductivity, such as alumite-treated aluminum, and the bottom 3 of the inner lid 3.
A plurality of viscous drop holes 35 are formed around the periphery of the container 0 to return the viscous introduced above the inner lid 3 together with the steam into the inner pot 14. Further, a plurality of the steam holes 34 that guide the steam in the inner pot 14 to the upper surface side of the inner lid 3 are formed in the peripheral wall 31 of the inner lid 3 at positions higher than the viscous drop holes 35.

The steam hole 34 is set to have a larger opening diameter than the viscous drop hole 35 described above.

Furthermore, the lower surface of the inner lid 3 is covered with a water-repellent resin coating A.

As the resin forming this film A, it is particularly suitable to use a polytetrafluoroethylene resin, which exhibits excellent water repellency and has heat resistance, oil resistance, impact resistance, chemical resistance, and This is because it has excellent releasability, can ensure good durability, and is also hygienic. In addition, the resin coating A can be formed of various water-repellent resins such as polypropylene resin, polyethylene resin, and silicone resin. In addition, as a specific example of the above-mentioned tetrafluoroethylene resin, it shows strong water repellency and is resistant to air and
Boreflon (trade name) manufactured by Sumitomo Electric Industries, Ltd., which allows gas to pass through, can be exemplified as a suitable example.

As a method for forming the resin coating A, in addition to coating, a method of attaching a resin sheet (or film) can be adopted. In addition, at home, a resin coating A is formed by spraying liquid resin on the lower surface of the inner lid 3, and after a certain amount of use, the resin coating A is peeled off and a new resin coating A is formed in the same manner as above. It may also be formed by

With the above configuration, as shown in Fig. 3, the water W condensing on the lower surface of the inner lid 3 during heat retention becomes spherical with a small contact area with the resin coating A, and falls before it grows large. As a result, the amount of water W condensing on the lower surface of the inner lid 3 is reduced. In this regard, conventionally, the water W that has condensed on the lower surface of the inner lid 3 is largely elongated on the lower surface of the inner lid, as shown by the dashed line in the same figure, and as a result, the water W that has condensed on the lower surface of the inner lid 3 is condensed on the lower surface of the inner lid 3. The amount of water W increases.

Further, the resin coating A may be formed of a porous material made of water-repellent resin, as shown in FIG.

This porous material made of water-repellent resin may be any material as long as it exhibits water-repellency, repels water, and allows air gas to pass through, such as the aforementioned tetrafluoroethylene resin, polypropylene resin, polyethylene resin, silicone, etc. Examples include porous materials made of resin and the like.

In particular, porous materials made of polytetrafluoroethylene resin are highly water repellent and allow air gas to pass through them well, so they are highly effective in preventing condensation.

The reason for condensation on the underside of the inner lid of a heat-retaining rice cooker is said to be that the lower surface of the inner lid has a lower temperature than other parts, so the water vapor that comes into contact with that surface becomes lower than the dew point.

Therefore, as mentioned above, the porous resin coating A is formed on the lower surface of the inner lid.
When applied, air gas enters this resin coating A,
Due to the heat insulating effect of air gas, the temperature of the surface that comes into contact with water vapor increases, so the amount of dew water distributed therein also decreases.

In addition, if the porous hole diameter is such that some water vapor can pass through, dew condensation will occur not only on the inner lid surface but also within the resin coating A, and will be dispersed within this coating A and condensation on the inner lid surface. amount is reduced. In addition, since the resin coating A itself is water repellent, as mentioned above, the particle size of the condensed water that adheres to the inner lid surface becomes minute, preventing it from falling onto the surface of the rice inside the rice cooker. .

In this way, since dew condensation on the lower surface of the inner M3 is not prevented by heating the inner lid 3, rice may become hardened or brown due to overheating of the inner lid by the lid heater, or rice may become brown due to insufficient heating. Conventional inconveniences such as white blurring can be solved.

In particular, in the embodiment, since the inner lid 3 is appropriately heated by the insulation heater 19 via the inner pot 14 during heat retention, the difference between the ambient temperature inside the inner pot 14 and the temperature of the inner lid 3 is small. Therefore, it is possible to more effectively prevent dew condensation from forming on the lower surface side of the inner lid 3.

Furthermore, with conventional products equipped with a lid heater, the inner lid is heated to a high temperature, so the steam inside the inner pot is likely to be released to the outside through the pressure regulating device when keeping warm, resulting in the inconvenience that the rice is likely to dry out. However, in this design, the inner lid is not heated to a high temperature, so the steam is difficult to escape and is maintained in a saturated state, giving the rice an appropriate amount of moisture and keeping it fresh for a long time. can.

Note that the present invention can be applied to various electrically heated containers having a heat retention function, such as electronic jars.

<Effects of the Invention> As described above, according to the electrically heated container of the present invention, condensation on the lower surface of the inner lid is prevented by using water repellent coating on the lower surface of the inner lid instead of heating the inner lid with a lid heater. Since this is done using a resin coating having a coating, there is no risk of inconveniences such as hardening, browning, and self-blurring of the rice caused by overheating or underheating the inner lid.

In addition, since there is no need for a lid heater for heating the inner lid, the structure can be simplified, and there is no need for insulation measures against steam or wiring for the lid heater, which were previously required, which is advantageous in terms of cost. becomes.

Moreover, since there is no possibility of the inconvenience of the wiring being cut, excellent durability can be exhibited.

[Brief explanation of drawings]

Fig. 1 is an enlarged cross-sectional view of the main part showing the inner lid, Fig. 2 is a longitudinal cross-sectional view showing an embodiment of the electric heating container according to the present invention, and Fig. 3 is an enlarged cross-sectional view of the main part showing the state of condensation formation. , FIG. 4 is an enlarged sectional view of a main part showing the state of dew condensation when the resin coating is made porous. DESCRIPTION OF SYMBOLS 1... Outer case, 2... Lid unit, 3... Inner lid, 3... Inner container, 14... Inner pot, A... Resin coating.

Claims (1)

[Claims] 1. It has an inner container provided inside the outer case, an inner pot removably housed in the inner container, a lid unit that closes the upper part of the outer case, and an inner lid that closes the inner pot. An electric heating container, wherein the lower surface of the inner lid is covered with a water-repellent resin film.