JP2903022B1 - Heat sink set of rice cooker - Google Patents

Abstract

An object of the present invention is to provide a radiating plate set comprising a combination of a radiating plate, a lid packing, and a radiating plate ring, even if these three members have different coefficients of thermal expansion, a seal between the radiating plate and the lid packing. Is to ensure that SOLUTION: A plurality of ribs 36 and 37 are formed on the inner surface of a mounting base 34 of a lid packing 29 with a gap in the vertical direction, and the ribs 36 and 37 are brought into close contact with the rising portions 32 of the heat radiating plate 28. The configuration is such that the upper ribs 36 maintain contact even when the lower ribs 37 are separated from the heat sink 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink set for a rice cooker, and more particularly to a seal structure for the heat sink set.

[0002]

2. Description of the Related Art It has been conventionally known that a lid of a rice cooker is constituted by a lid set and a heat sink set detachably attached to the lower surface of the lid set (for example, Japanese Utility Model Laid-Open No. 7-27415). reference).

The above-mentioned heat sink set includes a heat sink having the function of an inner lid, a lid packing mounted on an outer peripheral edge thereof, and a heat sink ring for integrally combining these. It is detachably attached to the lower surface of the heater mounting plate on the lower surface of the lid set.

Conventionally, the inner lid was simply attached to the lower surface of the lid set. However, in this case, dew condensation occurs on the inner lid when the rice is kept warm after cooking, and the dew condenses into the cooked rice to improve the taste. In view of the lowering, a heater was provided in the lid set, thereby heating the inner lid to prevent dew condensation. Because of this, the inner lid has a role of dissipating the heat of the heater to the inside of the jar body, and is therefore called a heat sink. Further, in order to prevent the lid packing from easily coming off, the inner lid (heat sink) ) And the packing are fixed by a heat sink ring, and such an assembly is called a heat sink set. The above-mentioned heat radiating plate is sometimes called a heating plate or a heat retaining plate.

FIG. 7 shows an example of the structure of a conventional heat sink set. The radiator plate set includes a radiator plate 28 made of stainless steel or aluminum and a rubber lid packing 29.
And a heat sink ring 31 made of plastic.

The heat radiating plate 28 is formed in a circular shape, and the outer periphery of the flange 40 is composed of a rising portion 32 and an outward projecting portion 33, and a downward bent edge 46 is formed around the outside of the projecting portion 33. .

The lid packing 29 has a mounting base 34 along the rising portion 32, and an outer flange 48 is formed at the upper end of the mounting base 34, and the outer peripheral edge of the flange 48 is further formed. , A downward bent edge 45 is formed. A lip 35 is formed at the lower end of the mounting base 34. One rib 37 is formed on the inner periphery of the boundary between the lip 35 and the lower end of the mounting base 34.

The inner mounting groove 3 is formed on the upper surface of the heat sink ring 31.
8 and an outer mounting groove 39 are formed in parallel, and an engaging projection 41 for mounting to the lid set is provided.

The collar 40 of the radiator plate 28 is fixed by a screw at a wide portion of the radiator plate ring 31 (not shown).

[0010]

In the above-mentioned radiator plate set, the radiator plate 28 is made of metal, the lid packing 29 is made of rubber, and the radiator plate ring 31 is made of plastic. Different expansion rates. For this reason, a gap is formed between the three members, such as when the rib 37 is separated from the rising portion 32 of the heat sink 28 during rice cooking, whereby the sealing property is impaired and steam leakage occurs, or the lid packing 2
There is a problem that the temperature of the lip portion 35 is lowered due to loss of thermal conductivity with the lip 9 and dew condensation occurs at that portion.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a radiator plate set having good sealing performance and less decrease in thermal conductivity irrespective of differences in thermal expansion coefficients of three members constituting the radiator plate set.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a combination of a heat sink, a lid packing and a heat sink ring which integrates them, and a rising portion is provided on the outer peripheral edge of the heat sink. And a flange comprising an outwardly extending portion, and a mounting base of the lid packing is attached to an inner peripheral surface of the heat sink plate ring, and a rising portion of the collar is arranged along an inner peripheral surface of the mounting base. In a radiator plate set of a rice cooker in which the upper end surface of the mounting base is pressed by the overhang portion of the collar and the overhang portion is fixed to the upper surface of the radiator plate ring, on the inner peripheral surface of the mounting base portion of the lid packing. A plurality of ribs spaced apart in the vertical direction are formed, and the ribs are in close contact with the rising portions of the heat sink.

It is possible to adopt a configuration in which a closed space is formed between each of the ribs and the rising portion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a heat sink set 1
5 shows an entire rice cooker using No. 5; In this rice cooker, a lid 12 is attached to a jar main body 11 by a hinge 13 (see FIG. 2) so as to be freely opened and closed. The lid 12 is composed of a lid set 14 and the heat sink set 15 described above.
A steam port set 16 is attached to the lid set 14, and a steam hole 17 is provided at a required position of the heat sink set 15 that matches the steam port set 16.

On the lower surface of the lid set 14 (the lower surface when the lid is closed, the same applies hereinafter), a mounting portion 18 of the heat sink set 15 is formed so as to be recessed one step. An arc-shaped finger-holding recess 1 is formed at both front corners of the inner peripheral surface of the mounting portion 18.
9 and 19 are provided, and finger-hung protrusions 21 and 21 of the heat sink set 15 are fitted into the finger-hook recesses 19.

A hook 22 is provided on the front surface of the jar main body 11, and is engaged with a locking claw 23 projecting from the center of the front end of the lid set 14 so as to be freely detachable.

A heater mounting plate 25 on which a heater 24 is mounted is mounted on the lower surface of the lid set 14 as shown in FIG. Further, the locking claw 23 is slidably mounted in the front-rear direction inside the front end portion of the lid set 14, and the coil spring 20 pressed against a part of the locking claw 23 is moved backward in the locking claw 23. Exerts an urging force.

A guide inclined surface 30 (see FIG. 4A) is provided at the rear end of the locking claw 23, and a continuous front engaging recess 26 is provided above the guide inclined surface 30 (FIG. 2). 4 (a)). The front engagement concave portion 26 is
When it is retracted by the urging force of the coil spring 20, it protrudes inside the mounting portion 18. As will be described later, when the radiator plate set 15 is attached, the locking claw 23 moves forward by being pushed by the radiator plate set 15, and projects forward of the lid set 14 to be engaged with the hook 22.

A shallow rear engagement recess 27 is provided at the rear end (the end on the hinge 13 side) of the mounting portion 18 facing the front engagement recess 26.

In FIG. 2, the lid 12 is a hinge 13
A state of being opened by pivoting about is indicated by a two-dot chain line.

As shown in FIGS. 3 to 5, the radiator plate set 15 includes a radiator plate 28 made of metal, a lid packing 29, and a radiator plate ring 31 made of plastic. The radiator plate 28 has the steam hole 17 formed at an eccentric position and a collar 40 formed at a peripheral edge. As shown in FIG. 5, the collar 40 includes a rising portion 32, an outward projecting portion 33 formed at the upper end thereof, and a bent edge 46 formed downward at the outer end of the projecting portion 33.

As shown in FIG. 5, the lid packing 29 has a lip portion 35 having a U-shaped cross section formed at the lower end of a mounting base 34, and a collar portion 48 is formed at the upper end of the mounting base 34. Further, a bent edge 45 is formed downward at the outer end of the collar portion 48. Also, two ribs 3 are provided on the inner peripheral surface at the lower end of the mounting base 34 with a required gap up and down.
6, 37 are formed.

The heat sink ring 31 has an inner mounting groove 38 and an outer mounting groove 39 formed on the upper surface thereof, and a front engaging projection 41 formed on the front end of the outer peripheral surface thereof. A rear engaging projection 42 (see FIG. 4) is formed at the rear end.

As shown in FIG. 3, on both sides of the front engaging projection 41, the above-mentioned finger hanging projections 21, 21 are provided symmetrically at positions about 45 degrees left and right with respect to the central angle, and Wide portions 43 are formed on both sides of the projecting pieces 21, 21. Similar wide portions 43 are also formed on both sides of the rear engaging projection 42, and screw holes 44 (see FIGS. 4B and 6) are respectively formed.

As shown in FIG. 5, the lid packing 29 is mounted by fitting its bent edge 45 into the inner mounting groove 38 of the heat sink ring 31, and the bent edge 4 of the heat sink 28.
6 is similarly fitted into the outer mounting groove 39 of the heat sink plate 31 and mounted.

The flange 40 of the radiator plate 28 is fixed by screwing a screw 47 into the screw hole 44 in the wide portion 43 of the radiator plate ring 31. The lid packing 29 is pressed by the overhang portion 33 of the collar 40, and
Sealing is achieved by pressing the ribs 36 and 37 of the book against the outer peripheral surface of the rising portion 32. In addition, each rib 36, 37
A sealed space 49 is formed between the upper part 32 and the rising part 32.

The front engagement projection 41 and the rear engagement projection 42 of the heat sink set 15 are respectively formed with the front engagement recess 26 and the rear engagement recess 26 of the lid set 14, as shown by the dashed line in FIG. 2
7 and is attached by engaging
1 and 21 are provided with a required clearance,
19 (see FIG. 2).

Heat sink set 15 of rice cooker of embodiment
Is used as described above. The steam generated inside the jar body 11 is discharged from the steam hole 17 through the steam port set 16 to the outside.

At this time, the temperature of the radiator plate set 15 also rises, and the lower ribs 37 due to differences in the thermal expansion coefficients of the metal radiator plate 28, rubber lid packing 29 and plastic radiator plate ring 31. May be separated from the rising portion 32 of the heat sink 28. However, since the upper rib 36 maintains the close contact with the rising portion 32, a seal is ensured, and vapor is prevented from leaking from between the lid packing 29 and the heat radiating plate 28.

As long as the two ribs 36 and 37 are in contact with the rising portion 32, the heat of the radiator plate 28 is transmitted to the lip 35 of the lid packing 29 through these ribs 36 and 37. Since the temperature of the portion 35 rises, no dew condensation occurs in that portion, and the rib 3
The closed space 49 between the ports 6 and 37 serves as a heat insulating space to keep the heat.

Further, as described above, even if the lower rib 37 may be separated from the rising portion 32 based on the difference in the coefficient of thermal expansion, heat conduction is performed by the upper rib 36, so that the lip portion The temperature at 35 rises as in the above case, thus preventing condensation.

If two or more of the ribs 36 and 37 are provided, the above operation becomes more remarkable.

[0033]

As described above, according to the present invention, by providing a plurality of ribs on the lid packing at the contact surface between the flange of the heat sink and the lid packing, the closed space between the ribs becomes a heat insulating space to keep heat. The performance is improved. In addition, even if some ribs are separated from the heat sink due to the difference in the coefficient of thermal expansion between the plurality of members, the other ribs come into contact with the heat sink, so that the sealing performance is ensured and the lip of the lid packing is secured. This has the effect of preventing the occurrence of dew condensation in the part.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment.

FIG. 2 is a partial sectional view of the above.

FIG. 3A is a partially cutaway bottom view of the heat sink set according to the embodiment, and FIG. 3B is a sectional view taken along line bb in FIG.

4 (a) is a partially omitted enlarged sectional view of the heat sink set of the above, and (b) is an enlarged sectional view taken along line IV-IV of FIG. 3 (a).

FIG. 5 is a partially enlarged cross-sectional view of the heat sink set of the above.

FIG. 6 is an exploded perspective view of the heat sink set according to the first embodiment;

FIG. 7 is a partially enlarged cross-sectional view of a conventional heat sink set.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Jar main body 12 Lid 13 Hinge 14 Lid set 15 Heat sink set 16 Steam port set 17 Steam hole 18 Mounting part 19 Finger recess 20 Coil spring 21 Finger projection 22 Hook 23 Locking claw 24 Heater 25 Heater mounting plate 26 Front Engaging concave portion 27 Rear engaging concave portion 28 Heat radiating plate 29 Lid packing 30 Guide inclined surface 31 Heat radiating plate ring 32 Rising portion 33 Overhanging portion 34 Mounting base 35 Lip portion 36, 37 Rib 38 Inner mounting groove 39 Outer mounting groove 40 Collar 41 Front Part engaging convex part 42 Rear engaging convex part 43 Wide part 44 Screw hole 45 Bending edge 46 Bending edge 47 Screw 48 Collar part 49 Sealed space

Claims (2)

(57) [Claims] 1. A radiator plate, a lid packing, and a combination of a radiator plate ring that integrates the radiator plate and a radiator plate ring, and a rim formed by a rising portion and an outwardly extending portion is formed on an outer peripheral edge of the radiator plate. Along with the mounting base of the lid packing along the inner peripheral surface of the plate ring, the rising portion of the collar is attached to the inner peripheral surface of the mounting base, and the upper end surface of the mounting base is pressed by the overhanging portion of the collar. In a heat sink set of a rice cooker in which the overhang portion is fixed to an upper surface of the heat sink ring, a plurality of vertically spaced ribs are formed on an inner peripheral surface of a mounting base of the lid packing,
A radiator plate set for a rice cooker, wherein each of the ribs is in close contact with a rising portion of the radiator plate. 2. The radiator plate set of a rice cooker according to claim 1, wherein a closed space is formed between each of the ribs and the rising portion.