JPS6011771B2 - infrared gas grill - Google Patents

Description

Detailed Description of the Invention The present invention uses ceramic as a heating element as a heat source for heating food and heats it with a burner, thereby emitting infrared rays with a wavelength distribution according to the absorption wavelength of the heated object. It provides an infrared gas grill.

Generally, when baking something, the influence of the infrared absorption characteristics of the food being heated is extremely large.

Figure 1 shows the reflection 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 mm. As can be seen from FIG. 1, fish meat has a relatively large number of tendrils that reflect or transmit light with a wavelength of 0.4 French m to 2.5 Am or a hot ant spring, making it difficult to absorb it. On the other hand, infrared rays with wavelengths longer than 2.5 m have almost no reflection or transmission.
It can be said that it is sufficiently absorbed by fish meat, converted into thermal energy, and used effectively for heating fish meat. Similar results were obtained not only for fish (mackerel) but also for cake seeds made by kneading 200 times of flour and 200 times of water. This is thought to be common when heating a wide variety of foods that contain large amounts of water, not just fish or cake seeds. In order to heat food efficiently, it is necessary to emit more heat rays in the infrared region that are longer than 2.5 meters 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 rays. Schwank burners are also used as infrared burners. However, even if we measure the wavelength distribution of infrared rays emitted from these devices, the dominant wavelength is 2 to 3 Am.
It is. Figure 2 shows the wavelength distribution of a grill with stainless steel as a heating element, and the wavelength distribution of a grill with a Schbank burner as a heating element at the mouth. It consists of a heating element and emits radiant energy shorter than 2.5 m, but it is not sufficiently absorbed by 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 they emit more wavelengths of 2.5 m or more, which are thought to be better absorbed by the food being heated. When searching for a heating element, Ti02, Z2,
Among ceramics such as BN, especially Aso203, Si02
It was discovered that a ceramic having a composition containing at least one of the following as a main component was superior as a heating element.

At 500oo, only 78% of the total radiant energy of stainless steel with an oxidized surface is at wavelengths of 2.5 m or more, whereas A〆203, Si02
It was found that out of the total radiant energy, radiant energy with wavelengths of 2.5 m or more accounted for 94% and 92%, respectively.

Also, 2.5 French m of a mixture of Aso203 and Sj02
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. (5
0000) As the proportion of American 203 increases, 2.5
The proportion of radiant energy with wavelengths of 1 m or more increases, but in order to fire ceramics whose main component is such materials, the firing temperature must be raised, which has the disadvantage of increasing costs. ``It can be expected to be sufficiently effective as a heating element.Porous ceramic bodies are excellent in terms of the shape of the heating element.

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 multilayer L type has a larger surface area and is advantageous for heat radiation. Also, because the surface is uneven and rough, it is ``better than a polished one made of the same material.
Much longer wavelength radiation can be performed. Because the specific gravity is low, the heat capacity is also small, and when heated with a burner, the temperature rises quickly, and because it is lightweight, it is easy to handle in the device. Unlike those that emit gas through holes and burn it on the surface, all you have to do is heat it with a burner.
The pores do not need to be continuous, and in terms of strength, it is better if only the surface heated by the burner is porous. Since precision is not required, it can be done at low cost.For porous ceramics, ceramic materials are mixed into a foaming synthetic resin stock solution and dispersed uniformly. There are products in which a ceramic slurry is coped and sintered on the finger, but any manufacturing method may be used.An example of the structure of the heating element is shown in FIGS. 4 and 5.

As shown in FIG. 4, the support frame vine, stopper 2, and bag lid 3 that support the porous ceramic prism are made of a material with excellent heat resistance such as stainless steel. A so2Q, Si02 on support frame 1
A porous ceramic containing at least one of the main components is cut into a prismatic shape with a diamond cutter, and the pieces 4 of the same length are arranged in parallel, fixed with a stopper 2 with screws, etc. The heating element 5 is formed by covering the parts. 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 6 and combusted at the flame port 8 of the burner 7. The high-temperature gas after combustion heats the heating element 5 on the upper part.The gas is radiated from the porous ceramic 4 incorporated in the heating element 5 to the saucer 9 on the lower surface. Built-in wire mesh I
Go to Q.

Further, the saucer is surrounded by a guide 11 and a stopper 12 at the back to prevent heat from dissipating to the outside. On the front side, a glass door turtle 3 connected to a saucer 9 and a handle turtle 4 installed thereon allow for easy access into and out of the refrigerator. The combustion gas that heated the heating element exits through the exhaust row 6 provided on the upper cover 15 and exits from the exhaust port 18 formed in the upper part of the exterior case 17. This is to prevent the temperature of the floor from rising.

Note that air necessary for combustion flows in through an air port 20 provided on the lower surface of the outer case 17. Place the object to be heated (food) on the gold steel turtle 0 and heat the heating element 5 with a burner.
To efficiently cook food by emitting a large amount of radiant energy effective for heating food with a temperature of more than 500 yen.

Example 1 Porous ceramic (A So20385%, Si0212%
) (discontinuous pores) to construct a heating element as shown in Fig. 5.

This was replaced with the grill of a commercially available gas staple stove with a grill, which was conventionally heated with a Bunsen burner using SUS430 gold steel as the heating element, but instead of the gold steel, a heating element made of porous ceramic was placed (Figure 6). Reference) A mixture of 200 grams of wheat flour and 200 grams of water was poured into a stainless steel rectangular plate set 7 feet below the burner and heated.

While the conventional product started to burn in 4 minutes, the product using the porous ceramic heating element started to burn in 3 minutes. Furthermore, when we took out the product after 5 minutes of heating, there were some parts of the conventional product that were not cooked all the way to the bottom, whereas those using the porous ceramic heating element were fully cooked all the way to the bottom. In addition, ``The burnt surface was less uneven and more evenly burnt compared to conventional products.
Arrange the fish on a metal plate set 7 feet above the burner and heat on a grill using a porous ceramic heating element for 7 minutes on the front and 6 minutes on the back.The food will be cooked perfectly and the surface will be evenly browned. It was grilled and looked delicious. On the other hand, even after heating for 13 minutes, the fish was not cooked well, the fish was watery, and the fish was not browned enough. Example 2 Porous ceramic (A So20369%, Si0228%
) to construct a heating element as shown in Figure 5, and as shown in Figures 6 and 7.
A test was conducted in the same manner as in Example 1 using a grill as shown in the figure (continuous pores).

When a tuna fillet (25 ribs thick) was heated on a grill using a porous ceramic heating element, it was completely cooked to the bottom in 4 minutes.

On the other hand, with the conventional product, even after 4 minutes, there was still some undercooked tuna fillet at the bottom. Example 3 Cordayrite (2Mg0/2A So203/$i02)
Using porous ceramic consisting of 5 fences x 6 sides x 20
I made a plate for my enemy and used it as a heating element.

Using this, the same test as in Example 1 was conducted. Commercially available cake premixes were mixed with water and heated. The product using a porous ceramic heating element made of cordierite was exposed to about 2/3 of silicic acid and began to become burnt, whereas the conventional product was exposed to about 3/4 of silicic acid and began to become burnt. I started. Also, when I took out the food after 6 minutes, I found that the porous ceramic heating element was completely cooked and the surface was evenly burnt, whereas with the conventional product, there were some areas that were not cooked all the way to the bottom, resulting in uneven cooking. There were many. As a comparative example of the above example, the component (A20385%; Si0
When comparing a heating element made of a porous ceramic body and a heating element made of a non-porous ceramic flat plate of the same size with the same configuration as in Example 1 (see Figure 6), the infrared radiation intensity on the wire mesh was When stable, the heating element made of a porous ceramic body had a heating value of 2 ratios per unit per hour, while when using a heating element made of a flat ceramic plate, the average temperature was 1 and a unit per unit per unit.

min, and the infrared radiation intensity was weak. In addition, when the surface temperature of the heating element was measured at a certain time after gas ignition, the average surface temperature was 780 pm for the above porous ceramic body and 660 pm for the above ceramic flat plate, and the variation in the surface temperature measured at each of the 6 locations was also found. The porous ceramic body heating element was smaller than the flat plate heating element.

As is clear from the above examples, the gas grill of the present invention uses a material that can emit a large amount of infrared wavelengths of 2.5 pm or more, which is effective for heating food, in a wide and uniform radiation area. Since the heating element is made of porous ceramic so as to radiate heat, the temperature rises quickly and the surface temperature of the heating element is uniform, allowing food to be cooked evenly and efficiently and quickly.

In addition, it has excellent effects such as low cost and light weight, making it easy to handle.

[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. Fig. 3 is a diagram showing the grille radiation wavelength distribution of the mixture of A203 and Si02.
．． Figure 4 is an exploded perspective view showing an example of a porous ceramic holder;
The figure is a perspective view showing an example of a heating element made of processed porous ceramic, FIG. 6 is a front cross-sectional view of an infrared gas grill in one embodiment of the present invention, and FIG. 7 is a side cross-sectional view of the same. 4... Porous ceramic, 5... Porous ceramic heating element, 6... Pipe, 7... Burner, 8... Burner port, 9...・Saucer, 13...
...Glass door, 17. ．． ．． ...Exterior case. Dormitory 1 Figure 2 *3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. An infrared gas grill that heats food by emitting infrared rays by heating a heating element made of porous ceramic containing at least one of Al_2O_3 and SiO_2 as a main component with a gas burner.