JPH07280218A - Infrared burner and burning cooker using the same - Google Patents

Abstract

PURPOSE:To obtain an infrared burner which has fast combustion stability and exhaust of unburnt components such as CO, etc., is small, and a burning cooker which has excellent cooking performance by using the same. CONSTITUTION:A plurality of burner ports 6 in which the inside diameter of the port is increased in a tapered shape from the upstream side to the downstream side of a fuel premixed gas are near a peripheral end of a ceramic combustion board in which a plurality of penetrating burner ports 3 are formed at the opening of a burner case 2 made of refractory metal. Thus, when the gas is passed through the ports 6 at the peripheral end at the the time of combustion, the passing velocity of the gas is gradually reduced as the inner diameter of the port 6 is increased, and the burning velocity of the gas is balanced with the passing velocity near the port 6, and hence a backfire is prevented. The temperature of the peripheral end can be quickly raised to be steady, thereby obtaining rapid combustion stability of the entire combustion surface of the board 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared burner used for cooking and the like and a baking cooker using the infrared burner.

[0002]

2. Description of the Related Art A conventional infrared burner and a baking cooker using the infrared burner will be described below.

As shown in FIGS. 9 and 10, a convex portion 34 having a flame opening 33 and a concave portion 35 having no flame opening 33 are alternately formed on the combustion surface of a ceramic combustion plate 32 arranged in the burner body 31. There is a baking cooker 38 in which an infrared burner 36 having the structure provided is installed in a baking chamber 37 (for example, Japanese Patent Laid-Open No.
234707).

In this structure, the concave portion 35 is used as the non-flame area to reduce the heat capacity of the convex portion 3 having the flame opening 33.
Although it was tried to secure the combustibility by alternately sandwiching with No. 4, the combustibility was not sufficiently maintained at the peripheral end portion where the combustibility was poorest due to the most cooling effect. In particular, at the initial stage of ignition, the flame formed at the peripheral edge portion floats from the flame port 33, the temperature does not rise easily, and as a result, stabilization of the entire combustion surface of the infrared burner 36 is delayed, and CO Fuel components were also generated.

Further, in the baking cooker 38 using the infrared burner 36 as a cooking burner, since the stabilization of combustion after the ignition of the infrared burner 36 is delayed, quick infrared radiation cannot be obtained and a good cooking result is obtained. Was not obtained.

In addition, another conventional infrared burner is shown in FIG.
As shown in FIG. 1, a large number of flame openings 40 are arranged on the combustion surface of the ceramic combustion board 39 at substantially the same pitch over the entire surface.
The flame port 40 is a small-diameter flame port 40a in a high temperature portion during combustion.
And, as the large-diameter flame port 40b in the low temperature part of the peripheral end,
Some of them are arranged on the burner body 41 (see, for example, Japanese Utility Model Laid-Open No. 55-122039).

In this structure, a large-diameter flame port 40b is formed at the peripheral end portion of the ceramic combustion board 39 to prevent the temperature from decreasing at the peripheral end portion. When the fuel gas is used for combustion, the temperature of the peripheral edge portion rapidly rises, a flashback phenomenon occurs partially at the peripheral edge portion, or the entire combustion surface of the ceramic combustion board 39 flashes back. It became money and lacked combustion stability.

[0008]

As described above, in the conventional structure, the infrared burner 36 delays the stabilization of the entire combustion surface of the ceramic burner 32, resulting in the generation of unburned components such as CO. The problem is that it is not compatible with many types of fuel gas, and the infrared burner 36 is used for the baking cooker 3.
When used as a cooking burner of No. 8, there was a problem that good cooking results could not be obtained.

The present invention solves the above-mentioned problems of the prior art by ensuring quick combustibility on the entire combustion surface of a ceramic combustion disc, reducing unburned components such as CO, and converting it into various types of fuel gas. Another object of the present invention is to provide an infrared burner that can also be used, and to use the infrared burner as a cooking burner to provide a baking cooker with which good cooking results can be obtained.

[0010]

In order to achieve this object, an infrared burner of the present invention and a baking cooker using the infrared burner penetrate a plurality of burner cases formed of a heat-resistant metal. A ceramic combustion board with a flame opening formed, the inner diameter of the flame opening near the peripheral end of the ceramic combustion board increasing from the upstream side to the downstream side where the fuel premix flows, and the ceramic combustion board The plate thickness in the vicinity of the peripheral end is 50 to 70% of the plate thickness of the portion of the ceramic combustion board where the flame openings other than the peripheral edge are provided, and the portion where the flame openings other than the peripheral edge are provided Configuration that gradually increases the plate thickness leading to
Alternatively, the infrared radiation coating is formed on both front and back surfaces of the burner case, and the infrared radiation coating or the uneven surface is provided on the surface of the ceramic burner facing the burner case, or it faces the ceramic burner of the burner case. The surface is provided with a Ni reflective coating or an Au reflective coating, and the infrared burner described above is disposed in the upper opening of the baking chamber having an exhaust port at one end.

[0011]

In this structure, by providing a plurality of flame openings whose flame diameters increase from the upstream side to the downstream side of the fuel premixture in the vicinity of the peripheral end portion of the ceramic combustion plate, the peripheral end portion at the time of ignition is provided. When the fuel premixture passes through the flame port of, the passage velocity of the fuel premixture decreases as the flame diameter increases,
The combustion speed and passage speed of the fuel pre-mixture are balanced in the vicinity of the flame mouth to prevent flashback, and the temperature at the peripheral edge rises rapidly and becomes steady to obtain quick combustion stability on the entire combustion surface. Will be done.

Further, by setting the plate thickness in the vicinity of the peripheral end portion of the ceramic combustion plate to be 50 to 70% of the plate thickness of the portion where the flame port is provided other than the peripheral end part of the ceramic combustion plate, the peripheral end portion The heat capacity decreases, the temperature rise at the peripheral edge is accelerated, rapid combustion stability of the entire combustion surface is obtained, and the plate thickness from the peripheral edge to the part other than the peripheral edge where the flame outlet is provided is The gradual increase results in a wide spread of infrared radiation.

Alternatively, the infrared radiation coatings are formed on both the front and back surfaces of the burner case, and the infrared radiation coatings are provided on the surface of the ceramic burner facing the burner case, so that heat radiation from the back surface of the ceramic burner during combustion is promoted. In addition, heat absorption from the surface of the burner case facing the ceramic burner and heat dissipation from the other surface of the burner case to the outside air are promoted, overheating in the burner case can be prevented, and ceramic combustion is suppressed while suppressing flashback. Since the thickness of the board can be reduced,
The rapid combustion stability of the ceramic burner can be maintained.Moreover, the surface of the ceramic burner facing the burner case has a large number of uneven surfaces, so that the area of heat radiation from the back surface of the ceramic burner during combustion can be increased. The burner case with infrared radiation coatings on both the front and back sides can radiate heat, so the thickness of the ceramic burner can be reduced while suppressing flashback, and the unevenness on the back surface of the ceramic burner can reduce burner burner thickness. Since it is possible to ensure uniform mixing of the fuel premixture in the case, it is possible to maintain quick combustion stability in the ceramic burner.

Alternatively, since the Ni reflective coating is provided on the surface of the burner case made of a heat-resistant metal facing the ceramic burner, the heat radiation from the back surface of the ceramic burner is efficiently performed by the Ni reflective coating. It is reflected on the back surface of the combustion board, and the combustion stability is obtained due to the rapid temperature rise of the ceramic combustion board. In particular, when the combustion quantity is narrowed down, the temperature decrease of the ceramic combustion board is suppressed, and a relatively wide combustion amount variable range Moreover, by providing an Au reflective coating on the surface facing the ceramic burner,
About 100% of the heat radiation from the back surface of the ceramic combustion board is reflected by the Au reflective coating to the back surface of the ceramic combustion board, and the rapid temperature rise of the ceramic combustion board provides the combustion stability. At this time, a relatively wide combustion amount variable range can be obtained by suppressing the temperature decrease of the ceramic combustion board, and the Au plating can realize high corrosion resistance of the burner case and enhance durability.

Further, by installing the infrared burner of the present invention in the opening at the upper part of the baking oven having an exhaust port at one end, the infrared burner exhibits quick combustion stability from the time of ignition, and the infrared rays are stable in the cooked food from early on. Since radiation is performed, efficient use of combustion energy can be achieved and good cooking results can be obtained.

[0016]

【Example】

(Embodiment 1) An embodiment of an infrared burner of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a ceramic combustion plate 4 having a plurality of penetrating flame ports 3 and 6 is arranged in the opening of a burner case 2 made of a heat-resistant metal of the burner body 1 to form a ceramic. A mixing chamber 5 for premixed fuel is formed in a space between the combustion board 4 and the burner case 2. In the vicinity of the peripheral end portion of the ceramic combustion plate 4, a plurality of flame openings 6 having a tapered inner diameter is formed from the upstream side to the downstream side of the fuel premix.

As described above, according to this embodiment, the inner diameter of the flame port 6 near the peripheral end portion of the ceramic combustion plate 4 is increased from the upstream side to the downstream side through which the fuel premixed gas flows. When the ceramic burner 4 is ignited and the fuel premixture passes through the flame end 6 at the peripheral end portion, the passage velocity of the fuel premixture gradually decreases as the inner diameter of the flame mouth 6 increases. Since the combustion speed and passage speed of the fuel pre-mixture are in balance, flashback is prevented, the temperature at the peripheral edge can be rapidly raised and stabilized, and stable combustion stability of the entire combustion surface of the ceramic combustion plate 4 can be achieved. The property can be secured, and the generation of unburned components such as CO can be reduced.

(Second Embodiment) A second embodiment of the infrared burner of the present invention will be described below.

As shown in FIG. 2, in this embodiment, a ceramic combustion board 4 having a flame outlet 6 is added to the structure of the above-mentioned embodiment 1.
A ceramic combustion disk 8 is formed in the vicinity of its peripheral end portion, in which a plurality of flame openings 7 whose inner diameters of the flame openings rapidly increase in two steps from the upstream side to the downstream side of the fuel premixed gas are formed.

As described above, according to the present embodiment, when the ceramic combustion board 8 is ignited and the fuel premixture passes through the flame opening 7 at the peripheral end, the fuel premixing is performed at the location where the inner diameter of the flame opening 7 increases. At the point where the flow velocity of the air-fuel mixture sharply decreases and the inner diameter of the flame port 7 increases, the combustion speed and passage speed of the fuel pre-mixture are balanced, so flashback is prevented, and the temperature at the peripheral edge is reduced. It can be rapidly raised and stabilized, and the same effect as that of the first embodiment can be obtained.

(Embodiment 3) A third embodiment of the infrared burner of the present invention will be described below.

As shown in FIG. 3, in this embodiment, in addition to the structure of the first embodiment, the thickness of the portion of the ceramic combustion board 4 where the flame port 3a is formed in the vicinity of the peripheral end portion is set to other than the peripheral end portion. 50 to 70% of the plate thickness of the portion where the flame opening 3 is formed, and the flame opening 3
This is a configuration of a ceramic combustion platen 9 in which the plate thickness up to the portion where is formed is gradually increased.

With this structure, when the ceramic burner 9 is ignited and the fuel premixture passes through the flame port 3a near the peripheral end, a film-like flame is generated from the peripheral end of the ceramic burner 9 to the entire combustion surface. Although formed, the heat capacity of the peripheral end portion of the ceramic combustion board 9 is reduced to about 50 to 70% like the plate thickness as compared with the portion where the flame port 3 is formed, so the temperature rises rapidly from the initial stage of ignition. However, quick combustion stability of the entire combustion surface can be obtained, and CO emission from the peripheral end can be suppressed to a low level. Further, a wide spread of infrared radiation can be obtained from the portion where the plate thickness gradually increases from the peripheral end portion to the portion where the flame port 3 is formed. In addition, in most cases, a normal ceramic burner has a plate thickness of about 13 to 14 mm, and the plate thickness of the peripheral end portion is 14 mm in consideration of strength retention. In that case, the optimum value is 9 to 10 mm, which is a reduction of about 70%.

(Fourth Embodiment) An infrared burner according to a fourth embodiment of the present invention will be described below.

As shown in FIG. 4, in this embodiment, in addition to the structure of the first embodiment, infrared radiation coatings 10 and 11 are provided on both front and back surfaces of the burner case 2, and a ceramic having a plurality of penetrating flame openings 3 is formed. An infrared radiation coating 13 is also provided on the surface of the combustion plate 12 facing the burner case 2.

With this structure, when the ceramic burner 12 is ignited and the fuel premixture passes through the flame port 3, a film-like flame is formed over the entire burning surface of the ceramic burner 12, but the infrared radiation coating 13 is formed. The heat radiation from the back surface of the ceramic burner 12 is promoted through the heat radiation from the surface of the burner case 2 facing the ceramic burner 12 through the infrared radiation coating 11 on the inner surface, and then through the infrared radiation coating 10 on the outer surface of the burner case 2. Since heat dissipation from the other surface is promoted and overheating in the burner case 2 can be prevented, the thickness of the ceramic combustion board 12 can be reduced while suppressing flashback. Therefore, since the heat capacity of the entire ceramic burner 12 is reduced, rapid combustion stability can be maintained, and an infrared burner having a relatively thin shape can be obtained. Therefore, normally, a ceramic combustion plate having a plate thickness of about 13 to 14 mm was used.
It can be thinned to about 10 mm.

(Fifth Embodiment) A fifth embodiment of the infrared burner of the present invention will be described below.

As shown in FIG. 5, in this embodiment, in addition to the structure of the above-mentioned fourth embodiment, a concavo-convex surface 15 is formed on the surface of the ceramic burner 14 facing the burner case 2 instead of the infrared radiation coating 13. Is.

With this configuration, when the ceramic combustion disc 14 is ignited and the fuel premixture passes through the flame port 3, a film-like flame is formed over the entire combustion surface of the ceramic combustion disc 14. The uneven surface 15 increases the heat radiation area, promotes heat radiation from the back surface of the ceramic combustion disc 14, and further absorbs heat from the surface of the burner case 2 facing the ceramic combustion disc 14 through the infrared radiation coating 11 on the inner surface, Through the infrared radiation coating 10 on the outer surface, heat dissipation from the other surface of the burner case 2 to the outside air is promoted, and overheating in the burner case 2 can be prevented. Therefore, the thickness of the ceramic burner 14 can be reduced while suppressing flashback. Moreover, the uneven surface 15 of the back surface of the ceramic combustion disk 14 can ensure uniform mixing of the fuel premixed gas in the burner case 2. Therefore, the combustion stability of the ceramic burner 14 can be maintained quickly, and the infrared burner can have a relatively thin shape.

(Embodiment 6) A sixth embodiment of the infrared burner of the present invention will be described below.

As shown in FIG. 6, this embodiment is the same as the structure of the first embodiment except that a Ni reflection coating 16 is provided on the surface of the burner case 2 facing the ceramic combustion board 4.

With this structure, when the ceramic combustion disc 4 is ignited and the fuel premixture passes through the flame port 3, a film-like flame is formed over the entire combustion surface of the ceramic combustion disc 4. The heat radiation from the back surface of the burner case 2 is reflected by the Ni reflective film 16 of the burner case 2 and fed back to the back surface of the ceramic combustion board 4, whereby the combustion stability is obtained due to the rapid temperature rise of the ceramic combustion board 4. In particular, a decrease in temperature of the ceramic combustion board 4 when the combustion amount is reduced is suppressed, CO emission is reduced, and a relatively wide combustion amount variable range can be obtained.

(Embodiment 7) A seventh embodiment of the infrared burner of the present invention will be described below.

As shown in FIG. 7, the present embodiment is the same as the first embodiment except that an Au reflective coating 17 is provided on the surface of the burner case 2 facing the ceramic combustion plate 4.

With this structure, when the ceramic combustion disc 4 is ignited and the fuel premixture passes through the flame port 3, a film-like flame is formed over the entire combustion surface of the ceramic combustion disc 4. Near 100% of the heat radiation from the back surface of the burner case 2 is reflected by the Au reflective coating 17 of the burner case 2 and is directly fed back to the back surface of the ceramic burner 4, so that the burner has the same effect as in the sixth embodiment. The corrosion resistance of the case 2 can be improved.

(Embodiment 8) An embodiment of the baking cooker of the present invention will be described below.

As shown in FIG. 8, an infrared burner 20 provided with the ceramic burner 9 of the above-described third embodiment is arranged in the upper opening of a baking chamber 19 having an exhaust port 18 at one end, and cooked food is prepared. A lower heat source 22 made of a sheathed heater is arranged in the lower part of the baking storage 19 via a slatting net 21 to be placed. Reference numeral 23 in the figure denotes a mixing tube provided in the burner case.

With this structure, when the cooking product is placed on the drainboard net 21, the lower heat source 22 is energized and the infrared burner 20 is ignited, the cooking product is simultaneously heated from both upper and lower sides, at which time the ceramic of the infrared burner 20 is heated. The heat capacity of the peripheral end portion of the combustion board 9 is 50 to 70 compared with the portion where the flame port 3 is provided.
%, The temperature rises rapidly from the initial stage of ignition, CO emission from the peripheral end is suppressed to a low level, and rapid combustion stabilization is performed, so that stable infrared radiation can be obtained. Further, since the infrared radiation can be spread from the portion where the plate thickness gradually increases from the peripheral end portion to the portion where the flame port 3 is provided, the heating range of the cooked food can be wide, and the rising speed is fast as a whole. In addition, since stable infrared radiation is emitted to the food from an early stage, the combustion energy can be made efficient and good cooking results can be obtained.

In the present embodiment, the baking cooker using the infrared burner of the third embodiment has been described, but good cooking results can be obtained using any of the infrared burners of the first to seventh embodiments. .

[0041]

As is apparent from the above description, according to the present invention, the inner diameter of the flame opening near the peripheral end of the ceramic combustion plate having a plurality of penetrating flame openings allows the fuel premixture to flow therethrough. The configuration is increased from the upstream side to the downstream side, and the plate thickness near the peripheral end of the ceramic combustion plate is 50 to 70% of the plate thickness other than the peripheral end of the ceramic combustion plate. The configuration is such that the plate thickness from the peripheral edge to the part where the flame openings other than the peripheral edge are provided is increased stepwise, or infrared radiation coatings are formed on both front and back surfaces of the burner case, and Infrared radiation coating or uneven surface is formed on the surface facing the burner case, or Ni reflective coating or Au reflective coating is formed on the surface of the burner case facing the ceramic burner, and one end of the baking cooker Grill with an exhaust port The above-mentioned infrared burner is installed in the opening in the upper part of the chamber to ensure quick combustibility on the entire combustion surface of the ceramic combustion disc, reduce unburned components such as CO, and reduce various types of fuel gas. It is possible to realize an excellent infrared burner that can also be applied to, and by using the infrared burner as a cooking burner, an excellent baking cooker that can obtain good cooking results can be realized.

[Brief description of drawings]

FIG. 1A is an external perspective view of an infrared burner according to a first embodiment of the present invention. FIG. 1B is an enlarged front schematic view of a main part of a ceramic combustion board of the infrared burner. FIG. 1C is an enlarged sectional view of FIG.

FIG. 2 (a) is a schematic front view of a main part of a ceramic combustion plate of an infrared burner according to a second embodiment of the present invention. (B) is an enlarged sectional view of (a).

FIG. 3A is a schematic front view of a main part of a ceramic combustion plate of an infrared burner according to a third embodiment of the present invention, and FIG. 3B is an enlarged sectional view of FIG.

FIG. 4 is a schematic sectional view showing an essential part of an infrared burner according to a fourth embodiment of the present invention.

FIG. 5 is a schematic sectional view of an essential part of an infrared burner according to a fifth embodiment of the present invention.

FIG. 6 is a schematic sectional view of an essential part of an infrared burner according to a sixth embodiment of the present invention.

FIG. 7 is a schematic sectional view of an essential part of an infrared burner according to a seventh embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view showing the concept of the configuration of a baking cooker using an infrared burner according to an embodiment of the present invention.

9A is an external perspective view of a conventional infrared burner, FIG. 9B is a schematic front view of a ceramic burner of the same infrared burner, and FIG. 9C is an enlarged front view of a main part of FIG.

FIG. 10 is a schematic sectional view of a baking cooker using a conventional infrared burner.

FIG. 11 is a schematic front view of a ceramic combustion plate of another conventional infrared burner.

[Explanation of symbols]

 2 Burner case 3,3a, 6,7 Flame opening 4,8,9,12,14 Ceramic burner 10,11,13 Infrared radiation coating 15 Rough surface 16 Ni reflective coating 17 Au reflective coating 18 Exhaust vent 19 Firing cabinet 20 Infrared burner

Front page continuation (72) Inventor Yuji Nakabayashi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Miki Moriguchi, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. Inventor Yoshiyuki Kajitani 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. A burner case made of a heat-resistant metal, and a ceramic combustion plate provided with a plurality of penetrating flame holes arranged in the burner case, the ceramic combustion plate near a peripheral end portion of the ceramic combustion plate. An infrared burner characterized in that the inner diameter of the flame opening increases from the upstream side through which the fuel premixture flows to the downstream side. 2. A burner case made of a heat-resistant metal, and a ceramic combustion plate having a plurality of penetrating flame openings arranged in the burner case, the ceramic combustion plate near the peripheral end portion of the ceramic combustion plate. The plate thickness is 50 to 50 times the plate thickness of the portion where the flame port is formed except the peripheral end portion of the ceramic combustion plate.
70%, and an infrared burner characterized in that the plate thickness from the peripheral end portion to the portion other than the peripheral end portion where the flame port is formed is gradually increased. 3. A burner case made of a heat-resistant metal having infrared radiation coatings on both front and back surfaces, and a ceramic burner having a plurality of penetrating flame openings arranged in the burner case. An infrared burner in which an infrared radiation coating is provided on the surface of the ceramic burner facing the burner case. 4. A burner case made of a heat-resistant metal having infrared radiation coatings on both front and back surfaces, and a ceramic burner in which a plurality of penetrating flame openings are formed in the burner case. An infrared burner in which an uneven surface is formed on the surface of the ceramic combustion plate facing the burner case. 5. A burner case made of a heat-resistant metal, and a ceramic combustion plate provided with a plurality of penetrating flame openings arranged in the burner case, and facing the ceramic combustion plate of the burner case. Infrared burner with Ni reflective coating on its surface. 6. A burner case made of a heat-resistant metal, and a ceramic combustion plate provided with a plurality of penetrating flame openings arranged in the burner case, and opposed to the ceramic combustion plate of the burner case. Infrared burner with Au reflective coating on its surface. 7. A baking cooker equipped with an infrared burner according to any one of claims 1 to 6, wherein the baking cooker has an exhaust port at one end, and the baking cooker is provided in an opening at an upper portion of the baking cooker.