JPS6327626Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improving the lid of a heat-retaining rice cooker, and specifically provides a heat-retaining rice cooker that can maintain heat efficiently with a simple structure and a small number of parts.

The structure of the lid in conventional heat-retaining rice cookers was to maintain heat retention by filling the inside with a heat insulating material, as seen in Utility Model Publication No. 48-41239 and Utility Model Publication No. 50-24339. Such a structure requires an extra member called a heat insulating material and has the disadvantage that the assembly structure is complicated.

The present invention aims to improve such drawbacks, and has a structure in which a flat plate-shaped reinforcing frame is provided to form a heat insulating space on the lower surface of the outer lid that freely opens and closes the upper opening of the rice cooker body. A flat heat sink is arranged on the lower surface of the reinforcing frame to form a sealed space, a heater is provided on the upper surface of the heat sink, a seal member is provided on the outer periphery, and the seal member is connected to the heat sink and the reinforcement. It is designed to be clamped and fixed with the frame, and as a result, the heat insulating space and the sealed space function as conventional heat insulators, making it possible to reduce the number of parts required.Moreover, the sealing member ensures that the inside of the lid can be accessed from the outside. can prevent steam from entering.

Next, embodiments of the present invention will be described based on the drawings.

Reference numeral 1 designates the main body of the heat-retaining rice cooker of the present invention, which includes a prismatic cylindrical frame 2 with an open top and a bottom, a prismatic cylindrical outer pot 3 with a bottom and a space within the frame 2;
A rectangular strip-shaped mounting frame 4 that connects the upper periphery of the outer pot 3 and the upper periphery of the frame 2, a heat insulating material 5 disposed within the interval, and can be inserted into and removed from the outer pot 3. A bottomed prismatic cylindrical inner pot 6 disposed in the bottom, a rice cooking heater 7 disposed in the inner bottom of the outer pot 3 and capable of heating the inner pot 6, and a top opening of the main body 1 that opens and closes. It consists of an outer lid 8 etc. that can be closed freely. A pair of hinge parts 9, 9 are attached to the upper outer periphery of the frame 2, and an engaging part 10 is attached to the upper outer periphery of the frame 2, which faces the hinge parts 9. The hinge parts 9, 9 and the engaging part 10 are both fixed via reinforcing metal fittings (not shown). The outer cover 8 has a substantially rectangular shape as shown in FIG. 4, and has a recess in the center.
0 is integrally formed, and a handle 11 is attached from one end of this recess 10 to the other. This outer lid 8 is rotatably attached to the hinge parts 9 and is connected to the engaging part 10 via a foot lever 12.
It can be detached from the connection at will. A flat plate-shaped reinforcing frame 13 is attached to the lower surface of the outer lid 8 with a gap between them, and a metal flat plate-shaped heat sink 14 is attached to the lower surface of the reinforcing frame 13 with a gap between them. The reinforcing frame 13 is molded from synthetic resin such as polypropylene,
A plurality of bosses 15 are integrally formed at appropriate positions on the back surface, and a steam guide cylinder 16 that communicates with the outside through the opening 8a of the outer cover 8 is integrally formed on the upper surface. A plurality of through holes 17 are bored in the upper surface of the steam guide cylinder 16. Further, a boss portion 20 facing the boss portion 15 of the reinforcing frame 13 is formed on the inner surface of the outer lid 8, and an annular projecting portion 21 is integrally provided vertically on the inner surface of the substantially central portion of the reinforcing frame 13. ing. The lower end surface of the projecting portion 21 is open. A bent portion 22 is integrally formed by bending the outer peripheral edge of the heat dissipation plate 14 upward, and a recess 24 is formed on the back surface of the approximately central portion, and a guide hole 25 communicating with the steam guide cylinder 16 is formed near the outside. ing. 26 is a rectangular band-shaped sealing member that is fitted into the bent portion 22 of the heat sink 14;
A contact piece 26a is integrally formed on the outer peripheral edge.

Assembling the entire outer cover 8 with such a configuration involves bringing the overhang 21 of the reinforcing frame 13 into contact with the outer periphery of the recess 24 of the heat dissipating plate 14, and inserting the communication hole 30 bored in an appropriate position in the sealing member 26 and the reinforcing frame. The steam guide tube 16 of No. 13 and the guide hole 25 of the heat sink plate 14 are communicated with each other, and the outer cover 8, the reinforcing frame body 13, and the heat sink plate 14 are integrally fixed with the mounting screws 31. The seal member 26 is clamped and fixed between the bent portion 22 and the reinforcing frame 13, and the outer cover 8 and the reinforcing frame 13 form a heat insulating space A, and the reinforcing frame 13 and the heat sink 14 form a sealed space B. It is something that will be done. The communication portion between the steam guide tube 16 and the guide hole 25 of the heat sink plate 14 is completely sealed by the seal member 26. 3
Reference numeral 5 denotes a lid heat-retaining heater attached to the upper surface of the heat sink 14 by a mounting plate 36, which has an annular shape as a whole and has a fixed heater 35a that continuously generates heat, and a variable heater whose energization is controlled by a temperature controller (not shown). It is composed of a heater 35b. 37 is a side heat retention heater wrapped around the upper inner surface of the outer pot 3;
Similarly, it is fixed by a mounting plate 36 and has a larger calorific value than the total calorific value of the lid heat retaining heater 35. At least the hinge portion 9 and the engaging portion 10
A reinforcing portion 4a is integrally formed at the lower part of the mounting frame 4 that exists on the surface of the frame 2 that does not have a surface, and this reinforcing portion 4a is brought into contact with the inner wall of the frame 2. Note that the reinforcing portion 4a is attached to the frame 2.
They may be formed over the entire inner wall, or may be formed partially at appropriate intervals.

Reference numeral 40 denotes an inner lid having a rectangular shape as a whole, and its outer peripheral edge is removably placed on the upper opening edge of the inner pot 6. 41 is a metal knob 42 in the center
It is a disc-shaped saucer on which a holder is placed upright, and an annular packing 43 is attached to the outer periphery. This circular packing 4
3 are integrally formed with pressing pieces 43a, 43a, 43a which are oriented upwardly at appropriate intervals. A convex portion 45 is integrally formed approximately at the center of the inner lid 40, and an inclined surface 40a that slopes low toward the bottom of the convex portion 45 is formed. A plurality of steam holes 47 are bored around the hole 46, and the convex portion 45
A oneba return hole 48 is bored near the bottom of the.
Reference numeral 49 denotes a pressure gasket which also serves as a valve and is inserted into and fixed in the insertion hole 46 of the inner lid 40, and is inserted into the steam hole 4 during rice cooking.
An opening/closing valve part 50 that opens 7 and closes it during heat retention, and a skirt part 51 that can press the upper surface of the saucer 41 are integrally formed.

To explain the assembly with such a configuration, first, the valve-cum-pressing gasket 49 is inserted and fixed into the insertion hole 46 of the inner cover 40, and then the knob 42, which is erected on the saucer 41, is formed in the valve-cum-pressing gasket 49. The first washer 55 is inserted into the knob 42 through the hole 49a so as to be freely movable, and then the second washer 57 is fixed to the knob 42 by inserting a spring 56 having a biasing force capable of expanding outward. The normally open/close valve section 50 covers the steam hole 47, and the steam hole 47 and the one-bar return hole 48 are positioned above the saucer 41. Further, the inclined surface 40a of the inner lid 40 is inclined downwardly toward the saucer 41. Reference numeral 60 denotes an operation lever that controls power supply to the rice cooking heater 7.

According to such a configuration, when the outer cover 8 is opened,
With the first washer 55 fixed, the spring 56 pushes the second washer 57 upward, and eventually the entire saucer 41 moves upward as the knob 42 rises, as shown in FIG. , the annular packing 43 is tightly pressed against the back surface of the inner lid 40. Further, when the outer cover 8 is closed from the above-mentioned state, the tip of the recess 24 of the heat sink 14 is inserted and abutted, and the contact area between the heat sink 14 and the knob 42 is widened, so that the conduction from the heat sink 14 is increased. Heat is actively transferred to the saucer 41 via the knob 42. Even if the outer cover 8 is strongly closed and the knob 42 collides with the recess 24, the protrusion 21 of the reinforcing frame 13 is in contact with the outer periphery of the recess 24, so the periphery of the recess 24 is reinforced. and the recess 24
will not be dented.

In addition, the prismatic cylindrical frame 2 is weaker against external forces than conventional cylindrical frames and tends to dent easily, but in the present invention, the frame 2 is strengthened by a reinforcing portion 4a integrally formed with the mounting frame 4. By being reinforced from the inside, it is possible to prevent such a situation from occurring. Then, the hinge part 9 and the engaging part 1
Since reinforcing metal fittings for attaching these parts are provided on the frame surface having 0, it is not necessary to form the reinforcing part 4a, or it may be formed.

Furthermore, when the outer lid 8 is closed, the knob 42 on the heat sink 14 is slightly lowered together with the saucer 41, and a gap is formed between the annular packing 43 and the back surface of the inner lid 40. The pressing pieces 43a, 43a, 43a of the annular packing 43 come into contact with the back surface of the inner lid 40 to maintain the saucer 41 substantially horizontally.

The rice that is generated during cooking is transferred from the gap to the saucer 4.
1, and a part of it flows out from the steam return hole 48 to the upper surface of the inner lid 40, while the steam is stored in the steam hole 4.
7, push up the on-off valve part 50 and open the steam guide cylinder 1.
6 to the outside. Further, the dew deposited on the back surface of the inner lid 40 is actively guided into the saucer 41 along the inclined surface 40a, and is prevented from falling onto the surface of the rice as much as possible.
Furthermore, since the oneba return hole 48 is formed above the saucer 41, the oneba that has flowed out onto the upper surface of the inner lid 40 after the rice cooking is completed can be positively returned to the saucer. Moreover, the steam hole 47 is located above the saucer 41.
As shown in FIG. 3, even if the outer lid 8 is removed and the spring 56 fails, the steam generated in the inner pot 6 will hit the saucer 41 and bypass the gap. Since the steam flows out by pushing up the on-off valve section 50 from the steam hole 47, it does not directly hit the user's hands or face. Of course, the same thing will happen even if the on-off valve section 50 breaks down.

The skirt portion 51 of the valve/pushing gasket 49, which is a single component, maintains the saucer 41 substantially horizontally, and the on-off valve 50 can perform operations such as opening and closing the steam hole 47.

Furthermore, a heat insulating space A and a sealed space B are formed by the reinforcing frame 13, so that the outer cover 8 can obtain a sufficient heat insulating effect without using a heat insulating material as in the conventional case. Moreover, the seal member 26 can reliably prevent steam from entering the closed space B.

Furthermore, since the steam guide tube 16 is integrally formed with the reinforcing frame 13, its molding is extremely simple and leakage of steam can be reliably prevented.

Immediately after rice cooking is finished, a large amount of dew adheres to the upper inner wall of the inner pot 6 and the back surface of the inner lid 40, and when the mode is switched to keeping the rice warm, this dew tends to fall onto the surface of the rice. Because of its large calorific value, the dew that adheres to the inner wall of the inner pot 6 is evaporated, and the lid heat retention heater 35, which has a small calorific value, does not actively evaporate the dew that has adhered to the back surface of the inner lid 40 and evaporates it into the saucer 41. It allows for natural flow storage.
During the heat retention operation, the side heat retention heater 37
The oneba stored in the saucer 41 is evaporated by the lid heat-retaining heater 35, and the steam generated at that time is circulated over the surface of the rice to prevent the rice from becoming dry.

Since the present invention is constructed as described above,
Sufficient heat insulation can be achieved without using a heat insulating material in the lid as in the conventional case, and the sealing member can prevent steam from entering, thereby preventing adverse effects of steam on the heater.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the inventive heat-retaining rice cooker with the inner lid removed, Figure 2 is a schematic sectional view of the inventive heat-retaining rice cooker, and Figure 3 is the same view with the outer lid open. 4 is an external perspective view of the outer cover, and FIG. 5 is an external perspective view of the annular packing. 8... Outer lid, 13... Reinforcement frame, 14... Heat sink, A... Heat insulating space, B... Sealed space.

Claims (1)

[Scope of utility model registration request] A flat reinforcing frame is provided to form a heat insulating space on the underside of the outer cover that can open and close the opening on the top of the rice cooker main body, and a flat plate heat dissipating frame is provided to form a sealed space on the underside of the reinforcing frame. A heat-retaining rice cooker characterized in that a plate is provided, a heater is provided on the upper surface of the heat sink, a seal member is provided on the outer periphery, and the seal member is sandwiched and fixed between the heat sink and the reinforcing frame. .