JPS5921689Y2 - Pot lid structure of electric boiler - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a pot lid structure for an electric cooking device.

Conventional electric rice cookers can only cook up to about 1 liter of rice at most, and cannot cook rice well beyond that amount.

In addition, in electric cooking devices such as conventional rice cookers in which an electric heating plate is arranged at the bottom and a rice cooking pot is placed on the upper surface of the electric heating plate so as to be pressed down by a pot lid pressing means, thermal distortion of the pot lid This causes a seal failure between the pot and the pot lid, which causes a drop in the temperature and pressure inside the pot, and in addition, heat loss occurs as the heat inside the pot is dissipated as conduction heat through the pot lid. They have the disadvantage that they are large, waste electricity, and take a long time to cook rice.

Furthermore, although gas-type cookers can cook a large amount of rice, the biggest problem is that there is always the risk of a gas explosion due to gas leakage.

In addition, the rice cooking temperature is extremely high at 800 to 1200°C (0 to 250°C in the case of electricity), and the indoor temperature rises significantly, especially in the summer, worsening the environment.

Also, gas poisoning accidents may occur if ventilation is not careful.

Furthermore, in the case of gas, the thermal efficiency is generally low at 50 to 60% (80 to 95% in the case of electricity) because the gas is discarded due to high-temperature combustion, and this invention has the above-mentioned drawbacks. The sealing accuracy between the pot and the pot lid is high, except for
An object of the present invention is to provide a pot lid structure for an electric cooking device such as a rice cooker, which prevents heat loss through the pot lid.

An embodiment of the rice cooker of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, the rice cooking outer box 10 includes an outer box main body 11 consisting of left and right side walls, a rear wall, and a bottom wall filled with a heat insulating material such as rock wool, and a hinge 12a that connects the outer box to the outside of the outer box. It consists of a front lid 12 whose lower part is pivoted so that it can be opened and closed, and whose inside is filled with a heat insulating material, and whose upper part is open.

An electric heating plate 20 is arranged in the lower part of the outer box 10, and a pot 30 is placed on the upper surface of the electric heating plate 20 so as to be freely put in and taken out in the front direction.

40 is a pot lid. As shown in the second figure, the electric heating plate 20 is divided into two parts in the horizontal left and right direction, and further divided into three parts in the horizontal front and rear direction, and is rectangular in plan view.
- Consists of 2Of and a sheathed heater 21 built into these divided pieces.

The sheathed heater 21 is housed in each divided piece in a meandering manner in a horizontal plane.

Divided piece 2 located in the middle in the front and back direction of the six-divided main body
Semicircular notches 22 and 22 for mounting a thermistor (not shown) are provided in each of the 0C and 20d facing the central portion of the entire electric heating plate.

These electric heating plates 20 are stored in an electric heating plate storage box 60 via an electric heating plate elastic push-up means 50.

The electric heating plate storage box 60 is box-shaped with an open top, and a notch 60a is provided in a part of the side wall for introducing a sheathed heater, and a cutout 60a is provided in a part of the side wall for introducing the sheathed heater, and an upper part is provided in the gap between the bottom and the electric heating plate division piece to push up the electric heating plate. A coil spring 51 is interposed to repel the ball.

The coil spring 51 is externally fitted and fixed to each annular metal fitting 52 protruding from the bottom upper surface of the electric heating plate storage box 60.

The coil springs 51 support each of the divided pieces of the electric heating plate at four locations, and evenly repel the divided pieces to bring them into close contact with the bottom of the pot.

The electric heating plate storage box 60 can be raised and lowered by a lifting means 70.

The pot 30 has a flange 32 formed on the top of a pot body 31.

The pot 40 is made up of an outer cover 41, which also serves as the lid of the outer rice cooking box 10, and an inner cover 42, which are assembled with a gap between the inner and outer cover fittings 43.

That is, as shown in the first figure, the outer cover 41 consists of a hollow main body 41a formed by bending a thin metal plate such as aluminum or alumite, and a short steam pipe 41b fitted in the center of the hollow main body 41a.

A through hole is provided in the center of the steam post short pipe 41b, and a female thread 41C is carved on the inner surface of the through hole.

Further, a gasket 4 is provided at the bottom of the steam post short pipe 41b.
An inner cover 42 made of a thin metal flat plate is fastened by a coupling fitting 43 via the upper and lower sides of the inner cover 2a.

That is, by screwing the male threaded cylindrical portion 43a of the coupling fitting 43 into the female thread 41C of the steam post short pipe 41b, the inner lid 42 is connected to the bottom of the steam post short pipe 41b and the coupling metal fitting 43. It is clamped and fixed between the provided flange portion 43b.

The male threaded cylindrical portion 43a is provided with a large diameter through hole 43C in the vertical direction at the center thereof.

Furthermore, a steam vent plug 44 having a flange 44a at the top and a small steam hole 44b at the center is removably screwed onto the upper part of the steam post short pipe 41b.

An airtight gasket 42b is attached to the lower surface of the periphery of the inner lid 42.

The outer lid 41 is a lid retainer 1 provided at the top of the rice cooking outer box 10.
4, it is mounted in close contact with the outer box.

The inner lid 42 has flexibility in the vertical direction so that the amount of displacement increases as it approaches its periphery.

A receiving part 15 is protruded from the inner periphery of the upper part of the outer box 10, and when weight is added to the pot 30, the flange part 32 is supported by the receiving part 15, so that the electric heating plate 2 due to the heavy pressure of the pot.
0, its attached parts, and the coil spring 51 are prevented from being subjected to excessive pressure.

The electric heating plate storage box lifting means 70 is constructed as follows.

As shown in FIGS. 1, 3 to 5, the cam rollers are connected to roller brackets 71, two of which are provided in each direction in a row at symmetrical positions on the bottom surface of the electric heating plate storage box 60, through roller shafts 72a. 72 is attached with its axis directed in the left-right direction of the rice cooker, and is configured to move up and down along the cam surface of the cam plate 73.

That is, when the front lid 12 is closed, the connecting plate 13 is fixed to the lower front surface of the lid.

Below the axis of the hinge 12a of the connecting plate 13,
A pin 13a is provided horizontally to protrude laterally.

The pin 13a engages with a vertically long pin locking hole 73d provided at the front end of the cam plate 73.

Therefore, the cam 73 is given a backward and forward movement as the front cover 12 is opened and closed.

The cam plate 73 has a cam surface formed at a portion where it comes into contact with the cam roller 72 due to its reciprocating motion, forming an edge between a rear upper horizontal surface 73 a and a front lower horizontal portion 73 b via an inclined surface 73 C.

When the cam plate 73 reciprocates in the front-rear direction, the cam roller 72 moves up and down along the cam surface.

That is, when the cam plate 73 moves forward and the cam roller 72 is on the rear upper horizontal portion 73a, the hook 30 is pushed upward together with the electric heating plate storage box 60, and the upper surface of the flange portion 32 of the hook 30 is brought into contact with the inner lid. The airtightness is maintained by being pressed against the airtight gasket 42b on the lower surface.

As shown in the third and fifth figures, the cam plate 73 is slidable in the front-rear direction within a groove 74a of a cam plate guide 74 which has a butt-shaped steel shape when viewed in longitudinal section.

The cam plate guide 74 is provided with a notch 74a so that the roller bracket 71 does not come into contact with the cam plate guide 74 when the cam roller 72 moves up and down.

A plurality of free rollers 16 are arranged in parallel on the inner surface of the front lid 12 so that the pot 30 can move thereon in the front-rear direction of the rice cooker when the front lid is opened.

The operation mode of the above structure will be explained.

When the front lid 12 is opened forward about the hinge 12a during non-cooking, the cam plate 73 is in the retreat position due to the backward movement of the pin 13a, as shown in the first figure, and the cam roller 72
is guided onto the front lower horizontal surface 73b of the cam plate 73.

As a result, the electric heating plate storage box 60 is lowered, and the lower surface of the flange 32 of the pot 30 is supported by the receiving portion 15 of the outer box, so that the pot 30 is held at the lowest position.

Therefore, even if the pot 30 is housed in the outer box 10, the close contact with the pot lid 40 is released and the pot is opened.

Next, when the front lid 12 is closed, the pin 13a moves forward and downward of the front lid 12, moving the cam plate 73 to the cam plate guide 74.
Pull it forward along the

Therefore, the cam roller 72 climbs the inclined surface 73C of the cam plate 73, reaches the rear upper horizontal surface 10, and raises the electric heating plate storage box 60 to the highest position.

Therefore, the hook 30 has a coil spring 51. It is lifted up via the electric heating plate 20, and its flange 32 is pressed into the airtight packing 42b on the lower surface of the inner lid 42 to maintain airtightness.

When electricity is applied to the electric heating plate 20, rice cooking begins.

The coiled length and elastic strength of the coil spring 51 are set in advance so that the coil spring 51 exhibits a lower limit or an upper limit state, respectively, when the hook 30 is housed in the outer box 10 or when it is not housed.

The steam vent plug 44 is attached when cooking rice, but is removed when the pot 30 is used as a steam generating pot.

This allows the steam to flow through the large diameter through hole 43 of the inner and outer lid coupling fittings 43.
It is possible to emit a larger amount than C.

As described above, the pot lid 40 has a double structure with an inner and outer lid, and the outer lid 41 consists of a hollow body 41a that is in close contact with the outer box 10, and the inner lid 42 is flexible and Lid 41
Since air is present in the gap between the container and the inner lid, the sealing condition between the container and the inner lid is good, and the heat inside the container 30 is extremely unlikely to be dissipated to the outside of the outer case body.

Further, the electric heating plate 20 is divided into six parts in the front, rear, left, and right directions, and each divided part is brought into close contact with the bottom surface of the pot by the elastic push-up means, so that the heating efficiency is extremely high.

That is, the electric heating plate is divided into a plurality of parts in the horizontal direction, and each divided piece of the electric heating plate is provided with a hot plate elastic pushing means, so that the electric heating plate is pressed against the bottom of the pot in each divided piece.

Therefore, there is little distortion of the electric heating plate, and even if there is some thermal deformation in the bottom of the pot, each electric heating plate segment comes into contact with the bottom, so the contact area increases as a whole, and therefore, heat dissipates. There is no dissipation and the thermal efficiency is high, resulting in a significant effect on the effective use of thermal energy and power savings.

In addition, there are more contact points than the total area of the bottom of the pot, and they are not concentrated in one place but are distributed, so boiling occurs from these contact points and internal convection is good.
This prevents the rice from being cooked unevenly.

As mentioned above, the present invention achieved an unexpectedly high thermal efficiency, completely overturning the conventional wisdom that the electricity cost for cooking rice is generally much higher than for gasification.

By the way, these comparative experimental values are shown below (cooked rice amount: 4 sho).

In addition, since the electric heating plate divided pieces are smaller, there is less distortion, so there is no need for much precision in the processing of the divided pieces or the cooking pot.
Easy to manufacture.

FIG. 6 shows another embodiment of the pot lid, in which when the rice cooker is used as a steamer, the through hole 4 of the steam post short pipe 41b is
In order to prevent the steam ejected from 1b from turning into water droplets and flowing down onto the outer lid 41 and collecting thereon, a dish-shaped water receiver 45 is fitted onto the steam post short pipe 41b, and the gasket 45 a
It is attached to the lid 41 via the through hole 41b, and is secured by tightening with a cap nut 46 having an upper hole 46a having the same diameter as the through hole 41b.

In addition, in this embodiment, the coupling fitting 43 is connected to the steam rear short pipe 41b.
Fitted externally at the bottom.

Further, an airtight gasket 42b is attached to sandwich the outer edge of the inner lid 42 from above and below, and this gastight gasket 42b
also serves as a cushioning material for the inner cover 42 with respect to the outer cover 41, sealing the gap between the inner covers and forming an insulating air layer 47 in the gap between the inner covers.

When the rice cooker is used for its original purpose, the upper hole 46a of the cap nut 46 is replaced with a smaller diameter hole (not shown).

Further, the electric heating plate storage box elevating means 70 is not necessarily operated in conjunction with the front cover 12, but may be operated by a separate actuating means such as another lever.

In the rice cooker of the present invention, the outer lid and the inner lid, which has an airtight gasket pasted on the lower surface of the periphery, are joined by the inner and outer lid joining fittings with a gap in the vertical direction. It is difficult for heat to be transferred to the pot and there is no thermal distortion, and the sealing between the pot and the pot lid is ensured, and no heat radiation or pressure release phenomenon occurs from the gap.

In addition, there is very little heat dissipated from the surface of the pot lid, resulting in good thermal efficiency and a correspondingly shorter cooking time, resulting in a significant power saving effect.

The airtight gasket is attached to the underside of the thin plate-shaped inner lid, so it is easy to install, and in the unlikely event that the inner lid is deformed and does not fit well with the lid, just the inner lid can be replaced. It's enough.

[Brief Description of the Drawings] Fig. 1 is a partially cutaway side view showing one embodiment of the present invention, Fig. 2 is a partially cutaway side view showing an embodiment of the present invention;
The figure is a partially cutaway plan view, Figure 3 is a III-III sectional view of Figure 1, Figure 4 is a side view of the cam plate, Figure 5 is a side view of the cam plate guide, and Figure 6 shows another embodiment. FIG. 10...Rice cooking outer box, 12...Front lid, 2
0... Electric heating plate, 30... Pot, 40...
...Pot lid, 41...Outer lid, 42...
・Inner lid, 43... Inner and outer lid connecting hardware, 44...
... Steam vent plug, 50 ... Electric heating plate elastic push-up means, 51 ... Coil spring, 60 ... Electric heating plate storage box, 70 ... Electric heating plate Storage box lifting means, 7
1...Roller bracket, 72...Cam roller, 73...Cam plate, 74...
Cam plate guide.

Claims (4)

[Scope of utility model registration request] (1) An electric heating plate is placed at the bottom of the heat-insulated outer box,
In an electric cooking device in which a pot sealed by a pot lid is placed on the top surface of the electric heating plate, the pot lid has a gap in the vertical direction between the outer cover and the inner cover having an airtight gasket attached to the bottom surface. A pot lid structure for an electric cooking device, characterized in that the inner and outer lids are connected by a connecting metal fitting, and the connecting metal fitting is provided with a steam vent hole. (2) The pot lid structure of the electric cooking device according to claim 1, wherein the electric heating plate is divided into a plurality of pieces in the horizontal direction. (3) The outer cover is made of a hollow body that fits tightly to the outer box, the coupling fitting has a flange portion at the lower part, and the inner cover is made of a thin metal plate and has flexibility, and the inner cover is made of a thin metal plate and is flexible. The pot lid structure for an electric cooking apparatus according to claim 2, wherein the lid is clamped and fixed between the flange portion of the coupling fitting and the outer lid. (4) The pot lid structure according to claim 3, wherein a dish-shaped water receptacle is attached to the coupling fitting protruding from the outer surface of the outer lid.