JPH0445652Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an electric heating container of an electric rice cooker, an electric pot, etc. whose lid unit can be completely removed from the outer case side.

<Prior art> Conventionally, in electric heating containers such as electric rice cookers and electric pots, a metal inner container is provided inside an outer case, a metal inner pot is housed in the inner container, and the inner pot is The inner lid is covered. For example, in an electric rice cooker as such an electric heating container, a lid heater installed in the lid unit heats the inner lid to prevent dew condensation from forming on the underside of the inner lid. It is common practice to heat the pot from the top.

However, in the electric rice cooker mentioned above, the structure of the lid unit is complicated, and the lead wire for the lid heater is introduced from the outer case side to the lid unit side, so there are problems such as the lid unit not being able to be removed from the outer case. There were flaws.

Therefore, in order to eliminate these drawbacks, the present applicant provided a heating element near the mouth edge of the inner container, brought the peripheral edge of the inner lid into contact with the vicinity of the mouth edge of the inner container, and removed the inner lid. By heating indirectly from the case side,
An electric heating container has been devised in which the structure of the lid unit can be simplified and the lid unit can be completely removed from the outer case (see Japanese Patent Application No. 187535/1986).

In this electric heating container whose lid unit can be removed from the outer case, the heating element is provided so as to surround the inner pot, so that the entire surface of the inner lid can be heated from the heating element through the peripheral edge of the inner lid. In this case, the peripheral edge of the inner lid had to be extended to the outer peripheral side of the mouth edge of the inner pot.

By the way, in this case, it is necessary to seal the space between the inner pot and the inner lid in order to prevent the dissipation of the steam inside the inner pot, but if the inner pot is brought into direct contact with the inner lid, There has been a problem in that the heat from the heating element flows into the inner pot from a position in the middle of the inner lid, making it impossible to efficiently and evenly heat the front of the inner lid.

Therefore, it is conceivable to attach a gasket to the lower surface of the inner lid that contacts the inner pot, but unless the shape and structure of the gasket is devised, it is not possible to provide a good seal between the inner pot and the inner lid.

For example, as a prior art,
The publication discloses an example of a gasket provided to seal the space between the inner pot and the inner lid. The gasket described in this publication is capable of sealing the space between the inner pot and the inner lid by having its tip vertically abut on the rim of the inner pot.

However, with such a packing that abuts in the vertical direction, even if the packing is made of an elastic material, it is difficult to expect a large elastic deformation, and when a large internal pressure is applied to the inner pot, the packing will deform. It had a tendency to succumb to pressure and deform outwards, reversing the internal pressure. Therefore, during assembly, there is a drawback that it takes time to adjust the position of attaching the gasket to the inner lid, the positional relationship between the inner pot and the inner lid, etc. In order to eliminate these drawbacks, in the product described in the above-mentioned publication, instead of changing the shape of the packing itself, the inner cover is biased downward by a cup-shaped elastic part, and it is in contact with the outer peripheral flange of the inner cover. The heat sink is elastically biased.

This invention was made against the background of such conventional technology, and an object of the present invention is to provide an electric heating container having a gasket that can be largely elastically deformed and can seal well between the inner pot and the inner lid. With the goal.

<Means for Solving the Problems> The electric heating container of this invention to achieve the above object includes an inner container having an outer case, an inner pot accommodated in the inner container, and an inner pot covered with the inner pot. The inner container includes a lid and a lid unit for the outer case, and a heating element is provided near the mouth edge of the inner container, and the peripheral edge of the inner lid is brought into contact with the heating element. In an electric heating container that is provided with a gasket on the periphery of the lid that presses against the rim of the inner pot to seal between the inner pot and the rim of the inner pot, the periphery of the inner lid has a gap along the inner periphery of the rim of the inner pot. forming an annular introduction wall that is fitted with a
This gasket is pressed against the rim of the inner pot as an annular seal lip bent inward from the outside so that the lower tip faces the introduction wall, and this gasket, the introduction wall of the inner lid, and the rim of the inner wall. The feature is that the gap between the two is a heat insulating space.

<Function> In the electric heating container configured as described above, an annular introduction wall is formed on the periphery of the inner lid, and is fitted with a gap along the inner periphery of the mouth edge of the inner pot. A patch is provided. Moreover, the gasket is pressed against the rim of the inner pot as an annular seal lip bent inward from the outside so that the lower tip faces the introduction wall, and the gasket, the introduction wall of the inner lid, and the rim of the inner pot are pressed against each other. The gap between the two is considered to be an insulating space. Therefore, when the lid is closed, even if the gap between the inner pot and the inner lid differs slightly due to assembly errors and adjustment errors that exist for each product, the packing will be able to accommodate the inner pot due to the large elastic deformation dimension of the annular seal lip. To sufficiently absorb errors in the gap between the pot and the inner lid, and to bring the inner pot and the inner lid into close contact with each other.

In particular, even when the internal pressure of the inner pot increases, the annular sealing lip acts in a direction to press against the inner lid and the lip of the inner pot in response to the increase in internal pressure, so that the sealing effect is good.

In addition, by forming a heat insulating space,
The heat that was escaping from the rim of the inner pot is stopped in the inner pot, improving the heat retention effect.

<Example> Hereinafter, an example will be described in detail based on the accompanying drawings showing an example.

FIG. 1 is a longitudinal sectional view showing an electric rice cooker as an electric heating container according to this invention. In the figure, the electric rice cooker includes a side member 2 made of a thin metal plate, a bottom member 3 made of synthetic resin formed on the lower side of this side member 2, and a synthetic resin made on the upper side of the side member 2. It is mainly composed of an outer case 1 having a substantially rectangular parallelepiped shape and a shoulder portion 4, and a lid unit 7 which is covered on the top surface of the outer case 1 so as to be openable and closable, and which is completely removable from the outer case 1. There is.

The outer case 1 has a cylindrical inner container 5 inside.
An inner pot 6 for cooking rice is removably housed inside the inner container 5. Furthermore, a side heater 50 for heating from the inner pot 6 and the side is provided on the outer periphery of the side of the inner container 5, and a heat insulating material 51 for preventing heat radiation is provided on the outside of the side heater 50. It is set up. moreover,
A center sensor 52 is attached to the penetration part formed in the center of the bottom of the inner container 5, and a hot plate 53 is provided between the bottom of the inner pot 6 and the inner container 5, so that the heat A bottom heater 54 that directly heats the inner pot 6 is embedded in the plate 53 so as to surround the center sensor 52 . A heating element 8 for heating the inner lid 9 is provided near the mouth edge 5a of the inner container 5.

FIG. 2 is a plan view of the outer case 1 with the lid unit 7 removed. As shown in the figure, on the shoulder 4 of the outer case 1, there is an operation switch 20 for manually controlling rice cooking conditions from the outside.
A liquid crystal display section 21 and the like for displaying the heating state are provided. A box 23 is provided directly below the shoulder 4 and between the outer case 1 and the inner container 5 to house electrical components such as a power supply board 22 as a unit.

The inner pot 6 is made of metal with high thermal conductivity,
The mouth edge 60 projects upwardly from the upper surface of the shoulder 4 of the outer case 1.

FIG. 3 is an enlarged sectional view of a main part showing the vicinity of the mouth edge 5a of the inner container 5. As shown in the same figure, the heating element 8 is covered with a metal cylindrical body 80 with good heat conduction, and this cylindrical body 80 is housed in a metal outer layer body 81. The lower end of the outer layer body 81 is fitted into the upper surface of the shoulder portion 4. Further, a shoulder ring 82 made of synthetic resin with excellent heat insulation properties is provided on the inner peripheral side of the shoulder portion 4.
is the side of the outer layer body 81 that is close to the inner pot 6 (inner peripheral side)
The outer layer body 81 is sandwiched between the shoulder portion 4 and the outer layer body 81 . The upper surfaces of the cylindrical body 80 and the outer layer body 81 are each formed flat in order to enhance the heat transfer effect to the peripheral edge 9a of the inner lid 9.

FIG. 4 is a plan view of the electric rice cooker with the lid unit 7 placed on the outer case 1. As shown in the figure, the lid unit 7 is provided with a locking mechanism 70 that can be engaged with the outer case 1 above the liquid crystal display section 21 of the shoulder section 4, and this locking mechanism 70 is also provided with a locking mechanism 70 that can be engaged with the outer case 1. A hinge mechanism 71 that can be freely connected to the outer case 1 is provided at an opposing position. Further, a steam exhaust port 72 is provided in the center of the lid unit 7, and a one-touch gasket 78 is attached below the steam exhaust port 72. Furthermore, an inner lid 9 that covers the inner pot 6 is provided on the lower surface of the lid unit 7, and a one-touch pin 75 with a built-in pressure regulator 74 is installed in the center of the upper surface of the inner lid 9, using screws or the like. It is fixed by a fixing member. The inner lid 9 is detachably attached to the one-touch gasket 73 of the lid unit 7. Note that the space between the lid unit 7 and the inner lid 9 is sealed by a gasket 76a attached to a recess 76 on the bottom surface of the lid unit 7 to prevent steam from leaking outside from sources other than the pressure regulator 74. ing.

The inner cover 9 is entirely made of a material with high thermal conductivity, such as metal such as aluminum, and as shown in FIG. Steam port 9b to guide and inner pot 6 to remove viscous
A discharge port 9c is provided for returning the water. Further, the peripheral edge 9a of the inner lid 9 is suspended so as to be able to come into contact with the upper surface of the outer layer 81 that houses the heating element 8.
The inner lid 9 can be heated indirectly by the heating element 8. Further, inside the peripheral edge 9a of the inner lid 9, a recess 90 is formed in which the mouth edge 60 of the inner pot 6 can be accommodated when the inner lid 9 is placed over the inner pot 6.

As shown in FIG. 3, the recess 90 is located in the inner pot 6
an annular introduction wall 91 that is fitted with a gap along the inner circumference of the mouth edge 60 of the inner pot 6; a hanging wall 93 that covers the outer circumference of the mouth edge 60 of the inner pot 6; It consists of an upper wall 92 that covers the. The hanging wall 93 is connected to the peripheral edge 9a of the inner pot 9. Above introduction wall 9
1, an annular collar 91b extending along the inner periphery of the mouth edge 60 of the inner pot 6 with a predetermined space A apart is formed integrally with the inner lid 9 by bending. ing. The annular collar 91b and the upper wall 92 form an annular engagement groove 91c. A rubber gasket 10 is attached to this engagement groove 91c.
are removably fitted, for example. The gasket 10 has an annular seal lip bent inward from the outside so that its lower end faces toward the introduction wall 91, and the annular seal lip is pressed against the rim of the inner pot. The annular seal lip can close a wide range of gaps, from relatively wide gaps to relatively narrow gaps, by changing its bending angle. Therefore, even if the gap between the mouth edge 60 of the inner pot 6 and the upper wall 92 of the inner lid 9 varies somewhat depending on the product, such variation is absorbed by the elastic deformation of the packing 10, and the inner pot 6 rim 60 and inner lid 9
The gasket 10 provides a good seal between the upper wall 92 and the upper wall 92. Note that the packing 10 is made of rubber having particularly low thermal conductivity.

Furthermore, an annular collar 9 is provided at the lower end of the introduction wall 91.
A curved surface portion 91a having a radius reaching around 1b is formed.

With the above configuration, the mouth edge 60 of the inner pot 6 and the inner lid 9 do not come into direct contact. For this reason, the heating element 8
from the inner lid 9 via the lid body 80 and the exterior body 81.
The heat transferred to the peripheral edge 9a can be prevented from escaping from the middle of the inner lid 9 toward the inner pot 6 side.

In addition, the introduction wall 91, especially the curved surface portion 91a,
A heat insulating space A is created by the mouth edge 60 and the packing 10.
Since this embodiment is formed, heat radiation, which conventionally was largely radiated from the mouth edge 60, can be prevented, and the heat retention effect is good.

Further, the packing 10 has an annular seal lip with a large elastic deformation rate, and the annular seal lip seals between the mouth edge 60 of the inner pot 6 and the inner lid 9, so that the steam inside the inner pot 6 is sealed. will not escape from between the inner pot 6 and the inner lid 9. In particular, when the internal pressure of the inner pot 6 increases, the annular seal lip acts in a direction to press against the inner lid 9 and the mouth edge 60 of the inner pot 6 in accordance with the increase in internal pressure, so the sealing effect of the annular seal lip is good. It is.

Further, in this embodiment, the packing 10 is made removable from the annular collar 91b. When removing the packing 10 from the inner lid 9, the annular collar 91
By simply releasing the locking of the gasket 10 by b, the gasket 10 can be removed from the engagement groove 91c. Therefore, the work of removing the gasket 10 from the inner lid 9 can be performed quickly and easily, and the gasket 10 can be removed from the inner lid 9 and washed frequently.

Furthermore, when attaching the gasket 10 to the inner lid 9, the gasket 10 is simply fitted into the introduction wall 91 and then pushed up along the introduction wall 91 to get over the annular collar 91b, and the gasket 10 is fitted into the engagement groove 91c. Can be easily fitted. At this time, since a curved surface part 91a with a large radius near the annular collar 91b is formed at the lower end of the introduction wall 91, by lifting the packing 10 along this radius 91a, the upper engagement groove 91a is formed.
1c can be easily guided.

Then, the gasket 10 fitted into the engagement groove 91c is locked to the annular collar 91b and the introduction wall 9
It is prevented from falling from 1.

The annular collar 91b is integrally formed by folding back the inner cover 9, so a special member for locking the gasket 10 is not required, and an increase in the number of parts can be suppressed. The entire surface of the inner lid 9 can be heated uniformly without inhibiting heat conduction in the inner lid 91.

Moreover, the side of the outer layer body 81 that is close to the inner pot 6 is
Since it is covered with a shoulder ring 82 made of synthetic resin, the outer layer body 81 housing the heating element 8 is attached to the mouth edge 6 of the inner pot 6.
Since the inner pot 6 is not exposed near 0, it is possible to prevent fingertips and the like from coming into contact with the outer layer body 81 and getting burned when the inner pot 6 is taken out from the inner container 5.

In addition, since the outer layer body 81 is held between the shoulder ring 82 and the shoulder portion 4, it is covered with the cylindrical body 80.
Moreover, it is possible to prevent the heating element 8 housed in the outer layer body 81 from shaking.

FIGS. 6 and 7 are enlarged sectional views of main parts near the mouth edge 5a of the inner container 5 showing other embodiments. 6 and 7, the packing 10 is also provided with an annular seal lip whose lower end is bent inward from the outside. By using the packing 10 having such an annular seal lip, the elastic deformation rate of the annular seal lip is sufficiently large, so that even if there is some dimensional error in the width of the gap in which the packing 10 is placed, the dimensional error can be avoided. Therefore, the gap can be sealed well. 6, the difference from the above embodiment is that the inner cover 9 is formed substantially flat from the lower surface of the annular flange 91b to the center of the inner cover 9 without providing an introduction wall 91. be. In this case, it goes without saying that the gasket 10 can be easily fitted into the engagement groove 91c.
It is easy to mold the annular collar 91b.

In FIG. 7, the difference from the previous embodiment is that the gasket 10 is held in a sandwiched state by the annular collar 91b.

In the above-mentioned embodiment, the packing 10 was explained as having a removable structure, but the packing 10 is attached to the inner lid 9.
It may also be configured to be fixed to. The fixing can be carried out, for example, by firmly clamping the gasket 10 between the annular collar 91b and the upper wall 92 of the inner lid 9.

In the above embodiments, an electric rice cooker has been described, but this invention is not limited to the above embodiments, and can also be implemented in, for example, electric pots and other electric heating containers. In addition, various design changes can be made without changing the gist of the invention.

<Effect of the invention> As described above, according to the electric heating container according to the present invention, the annular introduction wall is fitted to the peripheral edge of the inner pot with a gap along the inner periphery of the mouth edge of the inner pot. A seal is provided on the top of the introduction wall.
Furthermore, the seal is pressed against the rim of the inner pot as an annular seal lip bent inward from the outside so that its lower end faces toward the introduction wall. Therefore, it is possible to provide an electric heating container that has a higher elastic deformation rate than conventional gaskets and is configured to better seal the space between the inner pot and the inner lid.

In addition, since the inner pot and the inner lid do not come into direct contact, heat conduction from the heating element installed near the rim of the inner container to the inner pot is not hindered, and the entire surface of the inner lid is efficiently and evenly distributed. It can be heated to.

Furthermore, since the gap between the packing, the introduction wall of the inner lid, and the rim of the inner pot is an insulating space,
Heat that conventionally escaped from the rim of the inner pot can be stopped within the inner pot, resulting in a product with improved heat retention efficiency.

Furthermore, when the internal pressure of the inner pot increases, the annular sealing lip of the packing acts in a direction to press against the inner lid and the lip of the inner pot in response to the increase in internal pressure, so that a good sealing effect is achieved.

In addition, if the packing is configured to be removable from the annular collar, the packing can be easily attached and removed from the inner lid, and the packing can be removed from the inner lid and washed. It also has this effect.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an electric rice cooker showing an embodiment of the electric heating container according to this invention, Fig. 2 is a plan view showing the lid unit removed from the outer case, and Fig. 3 is a view of the inner container. FIG. 4 is a plan view of the electric rice cooker, FIG. 5 is a plan view of the inner lid, and FIGS. 6 and 7 are enlarged main portions showing other embodiments. FIG. 1...outer case, 5...inner container, 6...inner pot,
7... Lid unit, 8... Heating element, 9... Inner lid,
10... Packing, 5a... Mouth rim of inner container, 9
a...Periphery of inner lid, 60...Edge of inner pot, 9
1b...Annular tsuba.

Claims (1)

[Scope of Claim for Utility Model Registration] An inner container having an outer case, an inner pot housed in the inner pot, an inner lid covering the inner pot, and a lid unit for the outer case. A heating element is provided near the rim of the inner container, the edge of the periphery of the inner lid is brought into contact with the heating element, and the rim of the inner pot is pressed against the rim of the inner pot to form the inner pot. In an electric heating container provided with a gasket for sealing between the inner lid and the inner lid, an annular introduction wall is formed on the periphery of the inner lid, and is fitted with a gap along the inner periphery of the mouth edge of the inner pot. The above-mentioned gasket is provided on the upper part of the introduction wall, and this gasket is pressed against the rim of the inner pot as an annular seal lip bent inward from the outside so that the lower tip faces the introduction wall. An electric heating container characterized in that a gap between the introduction wall and the rim of the inner pot is an insulating space.