JPS6040768B2 - infrared gas grill - Google Patents

Description

Detailed Description of the Invention The present invention uses a ceramic with a cordierite composition added with aluminum titanate as a heat source for food heating, and heats it with a burner to generate a wavelength distribution according to the absorption wavelength of the heated object. This provides an efficient infrared gas grill that emits infrared rays.

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

Figure 1 shows the reflection spectrum and transmission spectrum of the flesh of a horse mackerel. The measurements were carried out using a spectrophotometer capable of measuring infrared radiation up to 15 mm. As can be seen from Figure 1, fish meat reflects or transmits a relatively large amount of light or heat rays with a wavelength of 0.41 m to 2.5 m.
Difficult to absorb. On the other hand, it can be said that infrared rays with wavelengths longer than 2.5 m are sufficiently absorbed by fish meat, with almost no reflection or transmission, and the infrared rays are converted into thermal energy and used effectively for heating the fish meat.

Similar results were obtained not only for fish (mackerel) but also for cake seeds kneaded with 200 times of flour and 200 times of water. This is thought to be common when heating a wide range of foods containing large amounts of water, not just fish or cake seeds. In order to heat food efficiently, it is necessary for the heating element to emit more infrared rays with wavelengths longer than 2.5 meters. 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, the dominant wavelength is 2 to 3 m. Figure 2A shows the wavelength distribution in a grill with stainless steel as the heating element, and the wavelength distribution in a grill with a Schbank burner as the heating element. A considerable amount of radiant energy is emitted from the heating element, which is shorter than 2.5 mm, and for the reasons mentioned above, 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 heating elements emit more wavelengths of 2.5 mm or more, which are thought to be better absorbed by the food being heated. When searching for Ti02, Zr02
Among ceramics such as , BN, Aso203, Si02, etc., we have found that ceramics with a cordierite composition and aluminum titanate added are particularly excellent as heat generating elements.

In 500OO, only 78% of the total radiant energy of stainless steel with an oxidized surface is at wavelengths of 2.5 fm or more, whereas aluminum titanate has a composition of copierite (2Mg012A and 2030$i02). (Ti02・Aso203) at 15 weight/f-
With cent addition, 2.0% of the total radiated energy.
It was found that 93% of the radiation energy is at wavelengths of 5 mm or more.

The shape of the heating element is one in which the metal surface is coated with a ceramic coating by plasma spraying.
One possibility is to use ceramic itself.

In particular, when thermal spraying is performed, ceramics with aluminum titanate added to the cordierite composition have low expansion and thermal shock resistance, so they adhere well to metal even in applications that are constantly exposed to high temperatures like the present invention. , can be expected to have a long life. It also has a small heat capacity, so it quickly heats up when heated, and is lightweight, making it easy to install inside equipment. Alternatively, the ceramic itself may be fixed with a suitable holder and used as a heating element without thermal spraying.

An example of the configuration of the heating element is shown in FIGS. 3 and 4. As shown in Figure 3, materials with excellent heat resistance such as stainless steel are folded and ceramics made of fired cordierite and aluminum titanate are cut into the same length using a diamond cutter. The stopper 2 is fixed with screws or the like to constitute the heating element 4.The fired ceramic used may have a plate-like shape, a prismatic shape, or a porous surface. FIG. 3 is a cross-sectional view of an example of an applied configuration.

FIG. 6 is a side sectional view.

The gas is led through a pipe 5 and burns at a flame port 7 of a burner 6.
After the combustion is completed, the high-temperature gas radiates effective infrared rays from the pipe-shaped ceramic 1 incorporated in the heating element 5 that heats the heating element 4 on the upper side, and heats the food on the metal steel 9 built in the saucer 8 on the lower surface. . Also, the saucer has guide 10 and stopper 1 at the back.
1 to prevent heat from dissipating to the outside. The front side has a glass door 12 connected to a saucer 8 and a handle 1 installed on it.
31 allows you to freely take things in and out of the warehouse. The combustion gas that has heated the heating element exits through an exhaust port 15 provided in the middle of the upper cover 14 and exits through an exhaust port 17 provided in the upper part of the outer case 16 to the outside.

The outer case is provided with a slight gap from the mounting surface by the leg turtle 8 to prevent the temperature of the floor surface 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 the metal steel 9, the heating element 4 is heated by the burner 6, and a large amount of radiant energy effective for heating food with a wavelength of 2.5 mm or more is radiated to efficiently cook the food. .

Example 1 Cordierite composition (2Mg0・Matsujime203・$i0
2) Aluminum titanate (Ti) per 100 parts by weight
A wire net made of metal trunk US430 was coated with plasma jet to a thickness of 0.3 ribs, to which 15 parts by weight of 02.Aso203) had been added, and was used as a heating element.

This is used in place of the wire mesh on the grill of a conventional commercially available gas stove with a grill, which uses a metal (SUS430) wire as the heating element and is heated with a Bunsen burner. That is, the fifth
The configuration shown in Fig. 6 was used. A mixture of 200 g of a commercially available cake premix and 120 cc of water was poured into a stainless steel plate placed on a wire mesh and heated.

With the conventional product, the surface burnt after 4 minutes and 19 steps, and it took 6 minutes and 19 minutes of sand to reach the bottom of the cake, but this product is coated with a ceramic containing aluminum titanate added to 10 parts by weight of cordierite. The one using the heated heating element started burning in 3 minutes and was completely cooked to the bottom in 5 minutes. In addition, grills that use ceramic-coated heating elements can handle tuna fillets (thickness 16 mm).
When I heated it up, it took 3 minutes and 19 minutes and the fire went all the way to the bottom. On the other hand, with the conventional grill, there was still some undercooked tuna fillet at the bottom even after four minutes. Example 2 A heating element as shown in FIG. 4 was constructed using a pipe-shaped ceramic fired material in which 1 part by weight of aluminum titanate was added to 10 parts by weight of cordierite composition. A similar test was conducted.

When two medium horse mackerel (150 yen) were lined up on a wire mesh and heated with a pipe-shaped ceramic heating element, 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 uses a material that can emit a large amount of infrared wavelengths of 2.5 m or more, which is effective for heating food, in a wide and uniform radiation area. The heating element is made of ceramic so that it radiates heat, so the temperature rises quickly and cooking can be done efficiently.

The cost of the heating element is low, and it has excellent effects such as being lightweight and easy to handle.

[Brief explanation of drawings]

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 shows an exploded perspective view of an example of a pipe-shaped ceramic holder; Figure 4 shows an example of a heating element made from processed pipe-shaped ceramic. A perspective view, FIG. 5 is a front cross-sectional view of an infrared gas grill according to an embodiment of the present invention, and FIG. 6 is a side cross-sectional view of the same side of the present invention. 3...Pipe-shaped ceramic, 4...Pipe-shaped ceramic heating element, 6...Burner, 12...Glass door. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. An infrared gas grill that heats food by emitting infrared rays by heating a heating element made of ceramic with a cordierite composition and aluminum titanate added with a gas burner.