JPS5924332B2 - infrared gas grill - Google Patents

Description

Detailed Description of the Invention The present invention uses a pipe-shaped ceramic as a heating element as a heat source for heating food, and heats it with a burner to emit infrared rays with a wavelength distribution corresponding to the absorption wavelength of the heated object. This is a good infrared gas grill.

Generally, when baking something, the infrared absorption characteristics of the food being heated have a very large effect.

Figure 1 shows the reflection spectrum and transmission spectrum of the flesh of a horse mackerel.

The measurement was performed using a spectrophotometer capable of measuring up to an infrared region of 15 μm.

As can be seen from Figure 1, fish meat is 0.4 μm to 2.5 μm.
It reflects or transmits a relatively large amount of light or heat rays with a wavelength of m (difficult to absorb).

On the other hand, infrared rays with wavelengths longer than 2.5 μm are fully absorbed by fish meat, with almost no reflection or transmission.
It can be said that it is converted into thermal energy and used effectively for heating fish meat.

Similar results were obtained not only for fish (horse mackerel) but also for cake ingredients kneaded with 2001 flour and 200 g of water.
Not only fish and cake seeds, but also a wide variety of foods that contain a large amount of water.
This is considered to be a common thing when heating food.

In order to heat food efficiently, it is necessary to emit more infrared rays with wavelengths longer than 2.5 μm from the heating element.

Traditionally, home gas grills use a method in which a metal plate is heated to a high temperature using a gas burner, and then the food is heated using infrared radiation.

Schwank burners are also used as infrared burners.

However, even when the wavelength distribution of infrared rays emitted from these materials is measured, the main wavelength is 2 to 3 μm.

Figure 2A shows the wavelength distribution in a grill with stainless steel as a heating element and the wavelength distribution in a grill with a Schbank burner as a heating element at the mouth.

A considerable amount of radiant energy shorter than 2.5 μm is emitted from the heating element, but it is not sufficiently absorbed by the food and is inefficient.

In view of the above prior art, the present invention provides a new infrared gas grill that can efficiently heat food using gas, which is currently the most commonly used cooking heat source.

The details of the present invention will be explained below along with examples.

It is generally known that ceramics emit infrared rays with longer wavelengths than metals, but we are searching for a heating element that emits more wavelengths of 2.5 μm or more, which are thought to be better absorbed by the food being heated. As a result, TI Q2, Z
Among ceramics such as ro 22 B N , especially At
203. It has been found that a ceramic having a composition containing at least one of SiO2 as a main component is excellent as a heating element.

At 500°C, out of the total radiant energy of stainless steel with an oxidized surface, the radiant energy at wavelengths of 2.5 μm or more is only 78%, whereas At203°S i 0
2, it was found that out of the total radiant energy, the radiant energy with wavelengths of 2.5 μm or more was 94% and 92%, respectively.

Also, 2.5 μm of a mixture of At203 and 5i02
When the ratio of the radiant energy of the above wavelengths to the total radiant energy is measured, the results shown in FIG. 3 are obtained.

(500°C) As the proportion of At203 increases, 2.
The proportion of radiant energy with wavelengths of 5 μm or more increases, but in order to fire ceramics whose main components are such materials, it is necessary to raise the firing temperature, which has the disadvantage of increasing costs. , it can be expected to be sufficiently effective as a heating element.

A pipe-shaped heating element is preferable.

In the case of infrared radiation, the larger the area of the heating element is, the more advantageous it is.
Compared to a simple ceramic plate, a pipe has a larger surface area and is advantageous for heat radiation.

Moreover, it has a small heat capacity, and when heated, the temperature rises quickly. - It is lightweight, so it can be easily installed in a device.

There is also the advantage that the size of the heating element can be changed freely to match the size of the grill by increasing or decreasing the number of ceramic pipes.

The shape of the hole and the outside shape may be round, square, triangular, or elliptical, as long as it is hollow.

It is advantageous to have a rough surface, and even if the material is made of the same material, the intensity of infrared radiation will be stronger if the surface is uneven and if the surface is polished.

An example of the configuration of the heating element is shown in FIGS. 4 and 5.

As shown in FIG. 4, a support 1 having a groove having the same width as the outer diameter of the ceramic pipe and a stopper 2 are made by folding a material with excellent heat resistance such as stainless steel.

At203. A heating element 4 is constructed by cutting a pipe-shaped ceramic whose main component is at least one of SiO3 into the same length with a diamond cutter 3 and fixing the best collar 2 with screws or the like.

FIG. 6 shows a cross-sectional view of one applied configuration example of the present invention, and FIG. 7 is a side cross-sectional view.

The gas is led through a pipe 5 and burned in the lower flame of a burner 6. The high-temperature gas that has completed combustion is radiated from the pipe-shaped ceramic 1 incorporated in the heating element 5 that heats the heating element 4 on the upper part to the saucer 8 on the lower surface. Go to the built-in gold steel 9.

Further, the saucer is surrounded by a guide 10 and a stopper 11 at the back to prevent heat from dissipating to the outside.

On the front side, a glass door 12 connected to a saucer 8 and a handle 13 installed thereon allow for easy access to and from the inside of the refrigerator.

The combustion gas that has heated the heating element exits through an exhaust port 15 provided in the upper cover 14 and exits through an exhaust port 17 opened in the upper part of the exterior case 16 to the outside.

The outer case is provided with a slight gap from the installation surface by legs 18 to prevent the temperature of the floor from rising.

Note that the air necessary for combustion flows in through an air port 19 provided on the lower surface of the outer case 16.

An object to be heated (food) is placed on a gold copper 9, a heating element 4 is heated by a burner 6, and a large amount of radiant energy effective for heating food with a wavelength of 2.5 μm or more is radiated to efficiently cook the food.

Example l Pipe-shaped ceramic (At20388, 5iO210
A heating element as shown in Fig. 5 was constructed using the above.

This is the grill of a commercially available gas staple stove with a grill, which is conventionally heated with a Bunsen burner using a metal 5US430 gold steel as the heating element, but instead of gold copper, the heating element is made of pipe-shaped ceramic in Figure 6.

It was set up as shown in Figure 7.

Commercially available cake premix 2001 and 130 cc of water were mixed, poured into a stainless steel plate placed on gilt copper, and heated.

With the conventional product, the surface burned in 4 minutes and 20 seconds, and it took 6 minutes and 20 seconds for the bottom of the cake to be completely cooked, whereas with the pipe-shaped ceramic heating element, it started to burn in 3 minutes and 10 seconds. The bottom of the cake was completely cooked in minutes.

Furthermore, when a fillet of tuna (18 rrrm thick) was heated on a grill using a pipe-shaped ceramic heating element, it was completely cooked to the bottom in 3 minutes and 30 seconds.

On the other hand, with the conventional product, there was still some undercooked tuna fillet at the bottom even after 4 minutes.

Example 2 Pipe-shaped ceramic (At20347, 5iO249
A heating element as shown in FIG. 5 was constructed and tested in the same manner as in Example 1.

When two medium horse mackerel (160f) were placed side by side on a gilt bronze plate and heated with a pipe-shaped ceramic, they were cooked faster than conventional products, and the surface was well browned.

As is clear from the above examples, the gas grill of the present invention is made of a material that can emit a large amount of infrared wavelength of 2.5 μm or more, which is effective for heating food, and has a wide radiation area and is designed to emit radiation uniformly. Since the heating element is made of pipe-shaped ceramic, the temperature rises quickly and cooking can be done efficiently.

Since the heating element is pipe-shaped, it has excellent effects such as high strength, low risk of breakage, low cost, and light weight and easy handling.

[Brief explanation of the drawing]

Figure 1 shows the reflection spectrum and transmission spectrum of fish (mackerel), and Figure 2 shows the radiation wavelength distribution of a conventional grill. Figure 3 is a diagram showing the radiation wavelength distribution of the grill opening used as a heating element. Fig. 4 is an exploded perspective view showing an example of a pipe-shaped ceramic holder, Fig. 5 is a perspective view showing an example of a heating element made of processed pipe-shaped ceramic, and Fig. 6 is a front view of an infrared gas grill in an embodiment of the present invention. 1 is a sectional view of the same side of the present invention. 3... Pipe-shaped ceramic, 4... Pipe-shaped ceramic heating element, 6... Burner, 12
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Claims (1)

[Claims] An infrared gas grill characterized in that it radiates infrared rays and heats food by heating a heating element made of pipe-shaped ceramic, one of which is a main component, with a gas burner.