JPS64191Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention relates to a rice cooker that cooks rice and keeps the rice warm after cooking.

BACKGROUND ART A rice cooker was originally provided with a rice cooking heater and a heat-retaining heater only on the side of the container housing the rice bowl. However, although the lid of the rice bowl receives heat from the body of the rice bowl, it is susceptible to the influence of outside air that enters through the gap between the rice bowl and the lid, and the temperature tends to be lower than that of the rice inside the rice bowl. This caused the steam generated by the rice to condense, causing the rice to become sticky and white due to the condensed water dripping onto the rice. Recently, a heater has also been installed inside the lid of the vessel.
The condensation is prevented by heating the rice bowl lid by radiating heat from a heat sink on the lower surface of the lid. In this case, the problem of condensation will be solved, but the upper part of the rice, especially the part facing the lid heater or heat sink, will tend to overheat, causing browning phenomenon in which the rice becomes hard and brown. Providing a heater increases the product cost and also increases power consumption.

Purpose The purpose of this invention is to provide a rice cooker that can eliminate the above-mentioned drawbacks of the conventional rice cooker by adopting a rice cooker lid structure that easily receives heat from the inner container and is less susceptible to the influence of outside air.

Features This device is equipped with a rice bowl lid that is removably suspended from the center of the rice bowl lid to close the rice bowl. It has a combination structure of a metal heat receiving plate whose outer periphery is mounted directly or through the flange of the rice bowl, and a heat insulating part provided on the upper surface side of the heat receiving plate, and the suspension structure in the center of the lid of the vessel. A steam venting passage is formed in at least one of the and the vicinity thereof.

As a result, this invention makes it easy for the heat receiving plate on the lower surface of the rice bowl lid to be easily heated by heat conduction directly from the meat container or through the rice bowl, and that the heat receiving plate is a heat insulator of the rice bowl lid. Due to the insulation effect of the two solid wall structure with wood, it is not easily affected by the outside air, and in order to suppress heat radiation from the inside of the rice bowl to the outside through the lid of the rice bowl, there was no lid heater, so there was no browning like conventional methods. It is possible to prevent steam from condensing on the lid of the rice cooker, and to ensure a sufficient heat retention function, without causing problems, complicating the assembly structure, or increasing power consumption. The heat insulating structure of the rice bowl lid may be simply a hollow double wall filled with a heat insulating material, and the structure is simple and can be provided at relatively low cost.

Example The example shown in the figure below will be described below.
In the embodiment shown in FIG. 1, a rice bowl lid 4 that is located at the lower part of the rice bowl lid 1 and closes a metal rice bowl 3 housed in the bowl body 2 has the same thermal conductivity as the rice bowl 3. It is a hollow double wall with a heat receiving plate 5 made of high-quality aluminum or the like as the bottom plate, and a top plate 6 made of stainless steel or the like with poor thermal conductivity as the top plate, and the inner and outer peripheries are caulked together 7, and the inside is coated with glass wool or rock wool. This is a heat insulating lid filled with a heat insulating material 8 such as foamed synthetic resin. The rice bowl lid 4 is suspended by an elastic bush 9 attached to its center hole so that it can be attached to and removed from a hanging pin 10 that is protruded from the center of the back surface of the rice bowl lid 1. 1 opens and closes at the same time.

The rice cooker 3 includes a rice cooker heater 13 which is held at the bottom of an inner container 11 made of a good thermal conductor such as aluminum of the container body 1 so as to be upwardly movable by a spring 12.
The mouth flange 3a is pressed against the built-in aluminum heating plate 14 by its own weight, and the shoulder portion 11 to which the insulating heater 15 is attached to the inside of the inner container 11 is attached.
The heat from the rice cooking heater 13 and the heat retention heater 15 is directly conducted from the heating plate 14 and the inner container 11. Reference numeral 16 denotes a heat-sensitive operating element that automatically switches from cooking to keeping rice warm.

Such a rice bowl storage type rice bowl lid 4 has a skirt in which the heat receiving plate 5 is attached to the base of the hanging pin 10 to the upper surface of the flange 3a of the rice bowl 3 when the rice bowl lid 1 is in the closed state. It is pressed by a shaped seal packing 17 to close the rice bowl 3 and receive heat transfer from the inner container 11 via the flange 3a of the rice bowl 3.

As a result, when keeping warm, the rice bowl lid 4 easily receives heat from the heat retention heater 15 to its heat receiving plate 5 by heat conduction via the shoulder 11a of the inner container 11 and the flange 3a of the rice bowl 3. , and the container body 2 and the container lid 1
Even if outside air flows in through the safety gap 18 formed between them, it will hardly affect the back heat receiving plate 5 due to the heat insulating structure of the rice cooker lid 4 itself. Therefore, the heat receiving plate 5
The required temperature is sufficiently maintained only by the heat-retaining heater 15 on the side of the vessel 2, and the steam generated from the rice does not condense. Moreover, the rice bowl lid 4 also suppresses heat radiation from the inside of the rice bowl 3 to the outside, and exhibits a sufficient heat retention effect without a lid heater.

A steam release passage 19 is provided between the rice cooker lid 4 and the seal packing 17 and within the suspension pin 10 to restrict and release steam generated within the rice cooker 3 during rice cooking and to regulate the pressure inside the rice cooker 3. It is being The steam release is restricted by the restricting action of the steam hole 20 formed in the close-fitting double wall 4a around the center hole of the rice cooker lid 4 and the steam hole 21 formed at the upper end of the hanging pin 10. Passage 19 between container lid 4 and seal packing 17
The expanded portion temporarily diffuses the outflow steam, weakens the oneva accompanying force, and acts as a oneva retaining chamber 22 that separates the accompanying oneva from the steam and retains it.

In this embodiment, it goes without saying that the rice bowl 3 may be of a so-called indirect cooking type in which the bottom of the rice bowl 3 is separated from the rice cooking heat source such as a heating plate. Further, the heat-retaining heater 15 is not limited to the inside of the shoulder portion 11a of the inner container 11, but may be provided at various positions depending on the necessary conditions, such as in the vicinity thereof, or may be provided separately at one or more locations. . The top plate 6 of the rice cooker lid 4 is preferably made of a material with low thermal conductivity in terms of heat insulation, and may be made of synthetic resin, since a sufficient heat insulation effect can be obtained by the double wall structure containing a heat insulating material. The material of the top plate 6 is not particularly limited.

In FIG. 2, a oneva return hole 23 is provided in a oneva retaining chamber 22 between the rice cooker lid 4 and the seal packing 17, and oneba, which is separated from steam in the chamber 22, is passed from the chamber 22 through the return hole 23. A large amount of oneba is returned to the rice bowl 3 and remains in the narrow chamber 22, preventing the separated oneba from being blown out to the outside by the released steam.

In FIG. 3, a pressure regulating valve 24 is provided in the middle of the steam release passage 19 formed in the hanging pin 10, and is pushed open when the pressure inside the rice bowl 3 is higher than a predetermined pressure. It is reliable and remains closed during heat retention to cut off communication to the outside inside the rice bowl 3 and prevent a drop in heat retention performance due to the steam release passage 19. The valve 24 is
Main body part 1 with fastening flange 10a of suspension pin 10
0b and a cap nut portion 10 with a fastening flange 10c.
The passage 19 is opened and closed by the valve seat 10e between the valve seat 10e and the cap nut 10d, and is kept normally closed by a spring 25 acting between the valve seat 10e and the cap nut 10d. Valve 24 is valve stem 2
4a is held on the top plate portion of the cap nut portion 10d in a vertically slidable manner and operates stably.

The embodiment shown in FIG.
1 is provided with a movable shoulder portion 31 which is made of the same material and has a built-in heat retention heater 15, and the movable shoulder portion 31
The flange 3a is reliably brought into close contact with the shoulder 31 while the rice bowl 3 is placed on the rice cooking heat source fixed to the inner bottom of the bowl 2 by absorbing dimensional errors and molding errors of each part by vertical movement of the rice cooker 3. The heat from the heater 15 can be efficiently transmitted to the heat receiving plate 5 of the rice cooker lid 4 by heat conduction.

The movable shoulder portion 31 is a hollow annular body, and cylinder feet 32 vertically provided at appropriate locations are fitted into the inner peripheral stepped portion 11b of the mouth edge of the inner container 11 so as to be vertically movable.
It is biased upward by a hollow elastic tube 33 provided above. A spring may be used instead of the tube 33. The tube leg 32 also passes through the tube 33, and a retaining nut 34 is attached to the lower end. The lead wire 35 of the heat retention heater 15 is
It is drawn into the vessel body 2 through one of the cylinder legs 32.

In the embodiment shown in FIG. 5, the heat receiving plate 5 of the rice bowl lid 4 is placed directly on the shoulder 11a of the internal container 11, and receives the heat of the heat retaining heater 15 directly from the shoulder 11a. The efficiency of heat conduction to the heat receiving plate 5 is further increased. The heat receiving plate 5 is connected to the inner container shoulder 1
The rice bowl 3 is closed by coming into contact with the mouth of the rice bowl 3 while being loaded onto the rice bowl 1a.
1 is installed and the rice bowl 3 is placed directly on the heating plate 14 fixed to the bottom of the container body 2, the rice bowl 3
The elastic edge wrapping portion 41 absorbs the height error between the inner container shoulder portion 11a and the molding error of the heat receiving plate 5, so that the heat receiving plate 5 is securely attached to the inner container shoulder portion 11a when the rice bowl 3 is closed. Accepted.

The rice bowl lid 4 has a top plate 6 made of synthetic resin to enhance its heat insulation effect. The top plate 6 is coupled to the heat receiving plate 5 by force fitting between the fitting grooves 42 formed on the inner and outer peripheries of the top plate 6 and the edge wraps 5a on the inner and outer peripheries of the heat receiving plate 5.

The embodiment shown in FIG.
A protruding portion 51 that also serves as a knob that forms a steam release passage 19 is integrally formed in the outer circumferential annular groove 51a of the protruding portion 51, and an elastic ring 53 attached to the inner periphery of the through hole 52 of the lid 1 of the container body. By elastically fitting, the rice bowl lid 4 is suspended from the container lid 1 in a detachable manner. A steam cylinder 54 with a steam retaining chamber 22 is screwed 55 to the inside of the protrusion 51 to form a steam discharge passage 19 . The top plate 6 is made of synthetic resin, and the protrusions 51 and the like can be easily integrally molded therein, but it may also be made of metal or the like. The elastic ring 53 is made of rubber or synthetic resin, and has a pair of ferrules 5 that connect the edges of the through hole 52 of the container lid 1 with each other by threading 56.
It is pinned between 7 and 58.

In the embodiment shown in FIG. 7, an opening at the bottom of the rice bowl retaining chamber 22 between the seal packing 17 and the rice bowl lid 4 is not provided, and the hanging pin 10 is inserted into the rice bowl 3 from inside the rice bowl lid 4. The steam release passage 19 to the outside is formed to have an opening 61 to the Oneva retaining chamber 22 on the way and a loop hole 62 from the Oneva retaining chamber 22 to the outside. A relief hole 63 is provided at a lower position than 61. As a result, the steam released from the passage 19 to the outside once flows into the wide Oneva retaining chamber 22, but is diffused by the expansion of the passage in the Oneva retaining chamber 22 and from the escape hole 63. Due to the sudden drop in steam momentum due to the pressure escape, the accompanying oneva is efficiently separated and left in the oneva retaining chamber 22, and the oneva is reliably prevented from blowing out to the outside. According to this invention, the metal heat-receiving plate of the rice bowl lid, which is removably suspended from the center of the rice bowl lid and closes the rice bowl, conducts heat directly from the inner container or through the flange of the rice bowl. The rice cooker is easily heated by the rice cooker, and is not easily affected by outside air due to the heat insulating effect of the heat insulating section provided in combination with the upper surface of the heat receiving plate, and it suppresses heat radiation from inside the rice bowl to the outside through the rice bowl lid. , it is possible to prevent steam generated in the rice cooker from condensing on the rice cooker lid during rice cooking without a lid heater, and to ensure sufficient heat retention function.

In particular, the steam release passage that restricts and releases the steam is provided by utilizing the fact that the central suspension structure of the container lid and its vicinity do not have an insulating structure. Steam can be released using the existing hanging structure without impairing the heat insulation effect of the rice cooker lid, and there is no need to provide a complicated steam passage in the rice cooker lid, and the insulation part has a simple structure. In addition, it can be provided at a relatively low cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part of a rice cooker showing one embodiment of this invention, Figs. 2 and 3 are partial sectional views showing different modifications, and Figs. 4 to 7 are respectively FIG. 7 is a partial cross-sectional view showing other embodiments. 1... Vessel lid, 2... Vessel body, 3... Rice utensil, {5
...Heat receiving plate, 6...Top plate, 8...Insulating material}4...
Rice bowl lid, {9... elastic bushing, 10... hanging pin} hanging structure section, 11... inner container, 15... heat retention heater, {19... steam release passage, 20, 21...
...Steam vent} Steam vent passage.

Claims (1)

[Scope of utility model registration request] A rice bowl lid is provided at the center of the rice bowl to close the rice bowl and is removably suspended from the center of the rice bowl. It has a combination structure of a metal heat receiving plate whose outer periphery is supported through a flange and a heat insulating part provided on the upper surface side of the heat receiving plate, and at least the suspension structure part in the center of the container lid and its vicinity. A rice cooking jar characterized by having a steam release passage formed on one side.