JPH0427475Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial technical field" The invention consists of a metal hollow body whose upper surface is formed into a smooth heat dissipation section (cooking surface), and a working fluid sealed inside it.
This relates to a so-called heat pipe type hot plate.

``Conventional technology'' For example, commercial hot plates used in restaurants etc. are used to handle large amounts of food (hamburgers,
Grill steaks, etc. In such cases, in order to maintain uniform quality, it is necessary to keep the temperature as constant as possible over the entire heat dissipation surface of the hot plate, but conventional hot plates made of a single plate of iron or stainless steel have little error. Since temperature control is difficult, recent attempts have been made to use a heat pipe type hot plate that allows more accurate temperature control and has good thermal efficiency.

Conventional heat pipe type hot plates are made by filling a stainless steel container with a wall thickness of approximately 4 mm with a smooth heat dissipating area on the entire top surface, and filling it with a working fluid such as diphenyl, which spreads over almost the entire surface of the heat receiving area at the bottom. The structure is such that a heating element such as a gas burner is provided to heat the engine, and the heat from the heater is transmitted to the heat radiating part via the working fluid.

``Problem that the invention aims to solve'' When this type of hot plate is used for a long period of time, it heats up in small amounts due to reactions between the container material and the hydraulic fluid, gas dissolution in the hydraulic fluid, and other causes. Initially, non-condensable gas is generated within the heat pipe. In the initial stage of heating, even if the entire bottom of the heat pipe is heated by the heating element, there will be parts with different temperatures inside the heat pipe, so the generated non-condensable gas will accumulate in the lower temperature parts.
There is a problem in that heat transfer in this part deteriorates, making it difficult to maintain uniform heat in the heat dissipation section, resulting in a decrease in performance as a hot plate.

The purpose of this invention is to prevent the generation of non-condensable gas in the heat pipe type hot plate.
The object of the present invention is to provide a hot plate having a structure that does not cause the above-mentioned deterioration in performance.

"Means for Solving the Problems" In order to achieve the above-mentioned object, the present invention provides a hot plate having a heat pipe having a smooth upper surface formed as a heat radiating part on a heating body such as a gas burner. A body is provided at one end of the heat pipe or a position close to the end, and the upper surface of the other end of the heat pipe is raised to a higher level than the heat radiating part to provide a gas reservoir part. It is something that

"Operation" When one end of the heat pipe is heated with a heating element, the temperature inside the heat pipe gradually increases from the end where the heating element is installed to the other end where the gas reservoir is formed. After heating for a certain period of time, the temperature becomes almost uniform throughout the entire area inside the heat pipe.
In many cases, non-condensable gas is generated at the beginning of heating (at startup) and has the property of moving to a lower temperature area (accumulating in a lower temperature space), so the generated non-condensable gas is The gas is guided toward the gas reservoir, and instead of collecting on the lower surface of the heat dissipation section, it accumulates in the gas reservoir.

In addition, the rising gas pool has a higher heat transfer coefficient with the outside air than the heat radiation part, so a considerable amount of steam condenses within this gas pool during operation, resulting in a relatively low temperature. Non-condensable gas generated within the pipe also accumulates in the gas reservoir.

``Example'' The drawing shows a preferred example of the heat pipe type hot plate according to the present invention. The heat pipe 1 constituting the hot plate is a hollow rectangular shape made of metal such as stainless steel or iron with a wall thickness of about 4 mm. It is formed into a panel shape, and the heat dissipation part 2, which is the cooking surface, is formed smoothly, and the interior is filled with diphenyl, diphenyl and diphenyl oxide (for example, a product of Nippon Steel Chemical Co., Ltd., trade name "Therm S300"), or other suitable material. Hydraulic fluid a is sealed.

In the heat pipe 1, a heating element 3 consisting of a gas burner is placed under a position near the end of the operating side b (slightly inward from the end) on which the cook usually stands, and is parallel to the edge of the operating side b. A cover 4 of the heating body 3 is provided at the bottom of the heat pipe 1 at the relevant position, and also serves as a leg.
is fixed, and a leg 5 is fixed to the other end of the bottom.

A gas reservoir section 6 communicating with the pipe 1 and rising to a higher level than the heat radiation section 2 is integrally formed on the opposite side of the heat pipe 1 from the operation side b.

These are side plates formed on both sides of the heat dissipation part 8.

In this embodiment, when the hot plate starts to be heated by the heating element 3, the working fluid a is heated by convection from the area near the heating element 3 to the area away from it.
Eventually, the entire temperature becomes uniform, but during this process, the temperature inside the heat pipe 1 increases sequentially from the part near the heating element 3 to the part far away where the gas reservoir 6 is located, so that the non-condensable gas generated also increases. The gas moves from the location where it occurs to the gas reservoir 6, which is a lower temperature region, and finally accumulates in the gas reservoir 6.

In addition, since the rising gas reservoir 6 has a higher heat transfer coefficient with the outside air than the heat radiating section, a considerable amount of steam condenses in this gas reservoir during operation, resulting in a temperature lower than that of the heat radiating section. Non-condensable gas generated within the medium heat pipe also accumulates in the gas reservoir.

Therefore, since the non-condensable gas does not hinder the release of latent heat to the heat radiating section, the performance of the heat pipe 1 does not deteriorate.

In the present invention, as illustrated by reference numeral 7 in the figure, a gas permeable material 7 (for example, palladium) that allows non-condensable gas to pass through is provided in the gas reservoir 6 in a state in which it is in contact with the gas inside and outside of the relevant part, Gas reservoir part 6
It is desirable that the structure be configured to eliminate non-condensable gas that accumulates in the air.

In addition, in the hot plate of the above embodiment, the heat dissipation section 2, the gas reservoir section 6, the side plate 8, and the bottom heating element 3 except for the cover 4 can be subjected to heat insulation processing to suppress heat dissipation. The interior of the pipe 1 can be divided into a plurality of chambers.
In this case, it is desirable to provide the heating element 3 and gas reservoir 6 in the same positional relationship for each chamber.

"Effect of the invention" The heat pipe type hot plate according to the invention prevents the non-condensable gas generated inside from accumulating on the lower surface of the heat radiation part, thereby preventing the latent heat of vaporization of the working fluid from being released to the heat radiation part. There is almost no problem, and there is no performance deterioration.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted sectional view showing an example of a heat pipe type hot plate according to the present invention. Explanation of main symbols in the figure: 1 is a heat pipe, 2 is a heat radiation part, 3 is a heating element, and 6 is a gas reservoir part.

Claims (1)

[Scope of utility model registration request] In a planar rectangular hot plate in which a heat pipe with a smooth upper surface formed as a heat radiating portion is provided on a heating body such as a gas burner, the heating body is placed at one end of the heat pipe or at a position close to the end. A heat pipe type hot plate characterized in that a gas reservoir is provided by raising an upper surface of the other end of the heat pipe to a higher level than the heat radiation part.