JPH0610928Y2 - Heat pipe type hot plate - Google Patents

Description

[Detailed Description of the Invention] "Industrial field of application" The present invention is a so-called heat pipe type hot plate in which a working liquid is enclosed in a metallic hollow panel whose upper surface is formed as a smooth heat radiating portion (cooking surface). It is about.

“Prior Art” For example, a commercial hot plate used for eating out places bake a large amount of food (hamburger steak, etc.) at a time. In such a case, in order to maintain the uniformity of quality, it is necessary to keep the temperature of the heat radiating surface of the hot plate as constant as possible over the entire surface, but the conventional hot plate made of a single plate of iron or stainless steel has less error. Since it is difficult to control the temperature, recently, a hot plate type that is capable of more accurate temperature control and has high thermal efficiency is being used as a hot plate.

As shown in FIG. 4, a conventional heat pipe type hot plate has a horizontal bottom plate which is a heat receiving portion in which a working liquid 2 is enclosed in a heat pipe 1 made of a hollow panel made of metal such as stainless steel or iron. 12 gas burners and other heating elements 3
The heat is transferred to the smooth heat radiating portion 11 on the upper surface, which is the cooking surface, through the working fluid 2, and the food is baked on the heat radiating portion 11 while maintaining the temperature of the heat radiating portion 11 at around 180 ° C.

[Problems to be solved by the invention] In such a hot plate, during the period from the heating of the bottom plate 12 which is the heat receiving portion to the transmission of the heat to the heat radiating portion 11, especially during the rising period (the heat radiating portion cooks). In the time until the temperature rises to an appropriate temperature), an extreme temperature difference occurs between the bottom plate 12 and the heat dissipation part 11, and the bottom plate 12 thermally expands.
A stress is generated in the side wall 13 which is a connection part with.

In a restaurant or the like, use / stop (heating and natural cooling) is repeated many times a day, so that the side wall 13 of the heat pipe may be fatigued / deteriorated and broken.

An object of the present invention is to provide a heat pipe type hot plate having a structure that prevents fatigue and deterioration of the side wall due to thermal expansion of the bottom plate as described above.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention is a hot plate as described above, wherein a gutter-shaped groove is formed in a bent state of the bottom plate constituting the heat receiving portion. Is.

The position at which the gutter-shaped grooves are formed and the number of the gutter-shaped grooves are not particularly limited, but it is preferable to form the gutter-shaped grooves in the central portion as much as possible, and it is preferable to arrange the gutter-shaped grooves in a well-balanced manner. Further, when a plurality of layers are formed, it is preferable to arrange them so that one of them intersects with the other.

The trough-shaped groove may be formed upward or downward.

Further, it is preferable that the bottom plate be as thin as possible within the constraint of strength, and it is more preferable that the trough-shaped groove is deeper than shallow.

[Operation] Since the heat pipe type hot plate according to the present invention is one in which one or more gutter-shaped grooves are formed upward or downward in a state in which the bottom plate that is the heat receiving portion is bent,
When the bottom plate is thermally expanded, the trough-shaped groove absorbs the expansion due to the cushioning action of the trough-shaped portion.

Therefore, the influence of thermal expansion of the bottom plate on the side wall is reduced to the extent that the trough-shaped groove absorbs it, and fatigue / deterioration of the side wall can be prevented.

"Embodiment" FIGS. 1 and 2 show a preferred example of the heat pipe type hot plate according to the present invention. The heat pipe 1 constituting the hot plate is made of an iron plate and has a wall thickness of about 9 mm. Consists of a part 11 and a bottom plate 12 and a side wall 13 each having a wall thickness of about 4.5 mm, depth 600 mm, width 1200 mm, height 1
It has a size of 20 mm.

In the bottom plate 12 which is the heat receiving portion, two bent grooves 4 in the depth direction and one groove groove 4 in the width direction are formed upward in a bent state of the bottom plate 12, respectively. The trough-shaped grooves 4 communicate with each other.

14 is a heat dissipation part 11 which is a cooking surface except the side where the cook is located.
The reference numeral 15 denotes an edge plate provided so as to surround the heat pipe 1, and 15 denotes a gas reservoir for storing the non-condensable gas generated inside, which communicates with the inside of the heat pipe 1.

The heat pipe 1 is filled with, for example, diphenyl or a mixed liquid of diphenyl and diphenyl oxide (for example, trade name "Therm S300") and other suitable working liquid 2, and the bottom plate 12 which is a heat receiving portion is covered with a gas burner. The heating is performed by the other heating element 3 and the temperature of the heat radiating portion 11 is controlled to be maintained at around 180 ° C.

When the heating plate 3 starts heating the bottom plate 12, the bottom plate 12
The bottom plate 12 thermally expands due to a large temperature difference between the heat sink 11 and the heat radiating portion 11. However, since the bottom plate 12 has the gutter-shaped groove 4 as described above, the expansion of the bottom plate 12 causes a cushioning action of the gutter-shaped groove 4. Or, it is absorbed by the spring action, and the change in outer shape is almost eliminated, and the influence on the side wall 13 is extremely reduced, and the fatigue and deterioration with time can be prevented.

Since the trough-shaped groove 4 of the bottom plate 12 is for absorbing the thermal expansion as described above, its cross-sectional shape is not limited as long as it produces a cushioning effect, and for the same reason, as shown in FIG. It is also possible to form the trough-shaped groove 4 on the bottom plate 12 downward.

[Advantage of the Invention] The heat pipe type hot plate according to the present invention is one in which an upward or downward gutter-shaped groove is formed in the bottom plate, and the thermal expansion of the bottom plate at the time of rising is absorbed by the gutter-shaped groove. The influence on the side wall due to the thermal expansion of the bottom plate is eliminated by an amount corresponding to the absorption, and fatigue and deterioration of the side wall can be prevented to obtain a durable hot plate.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an example of a hot plate according to the present invention, FIG. 2 is a sectional view, and FIG. 3 is a partial sectional view showing another embodiment. DESCRIPTION OF SYMBOLS IN THE MAIN FIGURE 1 is a heat pipe, 11 is a heat radiating portion, 12 is a bottom plate constituting a heat receiving portion, 13 is a side wall, 2 is hydraulic fluid, and 4 is a gutter-shaped groove.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Goro Ota 2-4-3, Okano, Nishi-ku, Yokohama-shi, Kanagawa Furukawa Electric Co., Ltd. Yokohama Research Laboratory (72) Inventor Junichi Mochizuki 1-5-20 Kaigan, Minato-ku, Tokyo No. Tokyo Gas Co., Ltd. (56) Reference JP-A-52-51268 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A hot plate comprising a heat pipe 1 made of a metal hollow panel, and a bottom plate 12 constituting a heat receiving portion.
One or more gutter-shaped grooves 4 with the bottom plate 12 bent.
Is formed so as to face upward or downward, a heat pipe type hot plate.