JP4095539B2 - Long surface combustion burner - Google Patents

Description

  The present invention relates to a long surface combustion burner, and more particularly to a technique for eliminating temperature unevenness of a long surface combustion burner.

  Conventionally, as a long surface combustion burner, a ceramic burner having a combustion surface formed of a ceramic plate or a metal knit burner formed by knitting a heat-resistant metal fiber in a knit shape (see, for example, Patent Document 1). Are known.

However, in a conventional long surface combustion burner, a gas outlet is usually disposed behind the center of the elongated combustion surface, and the premixed gas flows out from the gas outlet toward the center of the combustion surface. The premixed gas is excessively supplied to the center of the combustion surface, and the premixed gas is less likely to spread as it goes from the center to both ends, and as a result, temperature unevenness tends to occur as it goes from the center to both ends. there were.
JP 2001-235117 A

  The present invention has been invented in view of the above-described conventional problems, and provides a long surface combustion burner capable of spreading premixed gas over the entire long burner and improving temperature unevenness. It is to be an issue.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention is a gas flow in which the combustion surface 2 is formed in an elongated shape and the premixed gas 3 is supplied to the combustion surface 2 behind the center of the combustion surface 2. A long surface combustion burner in which an outlet 4 is disposed, and a long uniform plate 6 having a plurality of opening holes 5 is disposed between the elongated combustion surface 2 and the gas outlet 4, The opening area of the opening 5 is formed so that the both end portions 6b and 6b are larger than the central portion 6a of the uniform plate 6, and the premixed gas 3 is temporarily stored behind the uniform plate 6. A cylindrical space portion 8 is provided, a gas inlet 9 is provided on the end 8 a side of the cylindrical space portion 8, and the gas outlet 4 is provided on the center side of the cylindrical space portion 8. The premixed gas 3 taken in from the gas intake 9 is placed between the gas intake 9 and the gas outlet 4 in the cylinder. It is characterized in that a first baffle plate 11 for diffusing both end portions 8a of the space 8 and 8b side.

With such a configuration, the opening area is small at the central portion 6a of the uniform plate 6 and the opening area is large at both end portions 6b, 6b of the uniform plate 6, so both end portions 6b, Since the premixed gas 3 spreads to the 6b side, the feeding amount per unit time of the premixed gas 3 can be made substantially the same on the central portion 6a side and both end portions 6b side of the uniform plate 6. Furthermore, it is possible to prevent the premixed gas 3 fed into the cylindrical space portion 8 from the gas intake port 9 from flowing out directly from the gas outlet 4 provided on the center side of the cylindrical space portion 8, When the premixed gas 3 hits the first baffle plate 11 provided between the gas inlet 9 and the gas outlet 4 and rebounds or climbs over the premixed gas 3, both ends 8 a of the cylindrical space portion 8, 8b is spread over each side, and is uniformly dispersed in the cylindrical space 8. As a result, temperature unevenness can be improved, and the effect of realizing more uniform heating on the surface of the long combustion surface 2 can be obtained.

  In the invention described in claim 2, the combustion surface 2 is preferably a metal knit burner 1A formed by knitting heat-resistant metal fibers 7 in a knit shape. In this case, the size of the combustion surface 2 can be freely changed. . Further, the burner can be easily processed, for example, the shape of the burner can be arbitrarily designed according to the shape of the object to be heated. In addition, the shape of the combustion surface 2 can be freely processed into various shapes such as corrugated, semi-cylindrical, etc., and as a result, the heat load (burner surface load) per unit area can be increased, so the combustion range is wide and the gas pressure and air volume are wide. Stable combustion that does not affect fluctuations can be secured. Furthermore, it can be made thin and compact, does not take up installation space, and can be made strong against external impacts.

According to the third aspect of the present invention, the premixed gas 3 flowing out from the gas outlet 4 is diffused between the gas outlet 4 and the uniform plate 6 toward both ends 6b and 6b of the uniform plate 6, respectively. In this case, the premixed gas 3 flowing out from the gas outlet 4 hits the second baffle plate 12 and excessively flows out to the central portion 6a of the uniform plate 6. Since the premixed gas 3 diffuses toward the both end portions 6b and 6b of the uniform plate 6, the flow velocity distribution of the premixed gas 3 can be made uniform throughout the uniform plate 6 and temperature unevenness can be prevented. It becomes more effective for prevention.

In the invention described in claim 4 , it is preferable that each opening hole 5 formed in the uniform plate 6 is a circular hole. In this case, the uniform plate 6 can be easily configured by using a perforated plate such as a punching metal. This makes it easy to manufacture the uniform plate 6 and is advantageous in terms of cost.

  In the long surface combustion burner according to the present invention, the temperature unevenness can be improved by spreading the premixed gas over the entire long burner.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  1 to 3 show an example of a metal knit burner 1A as the long surface combustion burner 1 of this embodiment. The elongated combustion surface 2 of the metal knit burner 1A is formed by knitting heat-resistant metal fibers 7 in a knit shape as shown in FIG. The outer peripheral portion of the combustion surface 2 is fixed to a flange portion 28 a on the lower outer periphery of the burner housing 28. An ignition device (not shown) for igniting the premixed gas 3 by discharge is provided near the lower surface of the combustion surface 2.

  A long uniform plate 6 is disposed behind the combustion surface 2 in parallel with the combustion surface 2 as shown in FIG. The uniform plate 6 has a large number of opening holes 5 through which the premixed gas passes. By preventing the premixed gas 3 from the gas outlet 4 from flowing into the center of the combustion surface 2 excessively. It works to eliminate temperature unevenness. In this example, as shown in FIG. 4, the uniform plate 6 is formed of a bowl-shaped heat-resistant metal plate, and a large number of flat portions surrounded by the wall portions 18, 18 on both sides are spaced apart in the longitudinal direction A. A small hole group consisting of the opening holes 5 is formed. The small hole group is provided in the width direction B, for example, about 2 to 4 rows. Each opening hole 5 is formed by a circular punching hole that is punched from the upper surface of the uniform plate 6 toward the lower surface side, as indicated by an arrow a in FIG. Here, the uniform plate 6 is divided into three zones as shown in FIG. 4 (a). In the zone of the central portion 6a of the uniform plate 6, for example, a small opening hole 5 'having a diameter of 2 mm is formed. For example, a large opening hole 5 ″ having a diameter of 3 mm is used.

  In this example, the opening hole 5 (5 ′, 5 ″) is a circular hole, but other than the circular hole, for example, a square hole or a slit-like hole may be used. 4 does not need to be divided into three zones 6a, 6b, and 6b as shown in Fig. 4 (a), and in Fig. 4 (a), among the opening holes 5 'in the central portion 6a, The smallest hole may be the smallest hole, and the opening holes on both sides away from the center may be slightly larger (for example, holes of 2 mm or more and 3 mm or less). In short, from the center of the uniform plate 6 to both ends. As long as it has a structure larger than the opening area, the shape, size, arrangement, etc. of the holes can be appropriately changed.

  Behind the uniform plate 6 is a cylindrical space 8 for temporarily storing the premixed gas 3 as shown in FIG. A gas outlet 4 is provided on the center side of the cylindrical space portion 8, and a gas inlet 9 is provided on the one end 8 a side of the cylindrical space portion 8. Combustion gas supplied from the gas pipe is premixed with primary air in a mixer (not shown), and this premixed gas 3 is passed through the gas intake port 9 into the cylindrical space 8 by a direct current fan (not shown). To flow into.

  Further, as shown in FIG. 5, a wall-shaped first baffle plate 11 is erected in the cylindrical space 8 so as to block between the gas inlet 9 and the gas outlet 4. . Vent portions 19 through which the premixed gas 3 can pass are provided on both sides of the baffle plate 11 as indicated by an arrow d in FIG. As shown in FIG. 5, the lower part 11a of the baffle plate 11 is bent in an L shape, and is, for example, three-point spot welded at a position shifted from the gas outlet 4 to the gas inlet 9 side. It is fixed to the bottom surface of the part 8. The baffle plate 11 functions to uniformly disperse the premixed gas 3 in the cylindrical space 8. Incidentally, in order to uniformly disperse the premixed gas 3 in the cylindrical space portion 8, it can be solved by increasing the volume of the cylindrical space portion 8, but in this case, the burner size becomes too large. However, this problem can be eliminated by using the first baffle plate 11 in this example.

  Further, a second baffle plate 12 facing the central portion 6 a of the uniform plate 6 is disposed below the gas outlet 4. In this example, the second baffle plate 12 is formed in a bowl shape when viewed from the side, and both end portions 12a of the baffle plate 12 are fixed to both sides of the lower surface of the gas outlet 4 by, for example, three-point spot welding. Has been. The bowl-shaped baffle plate 12 is opened to both ends 6b and 6b of the uniform plate 6 so that the premixed gas 3 flowing out from the gas outlet 4 flows into the central portion 6a of the uniform plate 6 excessively. At the same time, as shown by the arrow b in FIG. 5 (b), the uniform plate 6 can be diffused to both ends 6b and 6b. The length of the metal knit burner 1A is 700 mm, for example, but it is not limited to this value. Note that reference numeral 17 in FIG. 2 denotes a fixing plate that supports the tip of the metal knit burner 1A.

  In the above configuration, the premixed gas 3 that has flowed in from the one end 8a side of the cylindrical space 8 hits the first baffle plate 11 and does not flow out as it is to the gas outlet 4 behind it, but the premixed gas 3 3 is rebounded to the first baffle plate 11, and the remainder passes through the ventilation part 19, so that the premixed gas 3 spreads to both ends 8 a and 8 b of the cylindrical space part 8. It is uniformly dispersed in the cylindrical space 8. Thereafter, when the gas pressure increases, the premixed gas 3 flows out from the gas outlet 4 and hits the second baffle plate 12. As a result, the premixed gas 3 can be prevented from excessively flowing out to the central portion 6a of the uniform plate 6 and diffused toward both ends 6b, 6b of the uniform plate 6, so that the flow velocity distribution of the premixed gas 3 is The entire uniform plate 6 is uniform. Furthermore, since each opening hole 5 ′ on the central portion 6a side of the uniform plate 6 is small and each opening hole 5 ″ on both end portions 6b side away from the gas outlet 4 is formed large, both end portions of the uniform plate 6 are formed. The premixed gas 3 is sufficiently distributed to the 6b and 6b sides, and the feeding amount per unit time of the premixed gas 3 on the central portion 6a side and the both end portions 6b side of the uniform plate 6 is made approximately the same. As a result, the premixed gas 3 spreads over the entire long burner, and the entire combustion surface 2 is red-heated and burns uniformly, so that temperature unevenness can be improved and the long combustion surface 2 is more uniform. The effect which can implement | achieve simple heating cooking is acquired.

  Moreover, the baffle plates 11 and 12 are easy to install, and the structure can be simplified. In addition, the uniform plate 6 can be easily constructed using a perforated plate such as a punching metal, and the production of the uniform plate 6 is facilitated, which is advantageous in terms of cost.

  Further, the metal knit burner 1A of the present example has the following effects compared to the conventional ceramic burner. That is, (1) the effect that the size of the combustion surface 2 can be freely changed, (2) the effect that the shape of the burner can be designed according to the shape of the object to be heated, and the burner can be easily processed, (3) the combustion surface 2 Can be processed into various shapes such as corrugated, semi-cylindrical, etc., so that the heat load (burner surface load) per unit area can be increased, so the combustion range is wide and it affects gas pressure and air flow fluctuations. (4) Since the conventional ceramic plate has only a fixed size plate, the surface load per burner is small, the amount of combustion is limited, and the burner is required when thermal power is required. Although it is necessary to increase the number, the metal knit burner 1A can secure a large heat load, so it can solve the problems of ceramic burners, and is thin and compact. Easy to handle because it does not take up installation space, (5) In addition, it is resistant to external impacts, (6) Quick response to heating and cooling, preheating time is halved and turn-down ratio can be increased (7) The effect of realizing high-efficiency operation at the same time, (7) The effect of reducing the pressure loss of the burner, (8) The effect of heating with high efficiency by the radiation from the burner surface and the convection of the high-temperature combustion gas, (9) There is no generation of nitrogen oxides or carbon monoxide, and there is an excellent effect in terms of environment. In the metal knit burner 1 having such various excellent effects, in the present invention, the temperature unevenness is improved by adopting the structure in which the uniform plate 6 is arranged and the structure in which the baffle plates 11 and 12 are arranged. This is a unique effect that cannot be obtained with conventional metal knit burners.

  FIGS. 7-9 has shown an example of the top-fire type pottery device 10 using the metal knit burner 1A (FIGS. 1-3) which concerns on this invention. The upper-fire type pottery device 10 is used, for example, as a commercial yakitori device. Of course, it can be used for other than yakitori. Here, a metal knit burner 1 </ b> A constituting the upper-burn burner 14 is installed above the pottery support 15 on which the object to be fired is placed. It is arranged below. In FIG. 7, 29 is a gas pipe insertion portion, 30 is an operation handle or lever, and 31 in FIG. 8 is a top plate with an exhaust hole. Thus, during cooking, the air flow from the cooling blower 32 is blown out from two locations, the slit portion 21 at the bottom of the aquarium installation table 22 and the side wall portion 23 of the aquarium 16 as shown in FIG. It becomes an air flow that cools the water tank 16, and this air flow further becomes an air curtain H for heat insulation that cools the grilled chicken skewer 60 and further cools the cook's hand that returns the skewer 60. . Further, the air curtain H serves to discharge the exhaust gas G during heating to the outside while cooling, thereby improving the cooking environment. Further, the metal knit burner 1A according to the present invention is all primary air combustion that does not require secondary air, and therefore can be used without being affected by exhaust. Further, by using the metal knit burner 1A having no temperature unevenness according to the present invention, cooking unevenness can be eliminated and the baking quality can be improved.

  In addition, the structure which arrange | positioned the uniform board 6 of this invention, and also the structure which provided the baffle plates 11 and 12 are applicable similarly to elongate surface combustion burners 1, such as a ceramic burner, besides metal knit burner 1A.

  Moreover, the long surface combustion burner 1 which concerns on this invention is applicable also to the double-sided ceramic device which provided the burner in the upper and lower sides other than the upper-fired-type ceramic device 10 of FIGS. The present invention can be widely applied to various heat treatment related fields such as heating, boilers and dryers.

1 shows an embodiment of the present invention, in which (a) is a partially cutaway front view of a metal knit burner, (b) is a left side view, and (c) is a right side view. It is a top view of a metal knit burner same as the above. It is a bottom view of a metal knit burner same as the above. (A) is a top view of the uniform board same as the above, (b) is a front view, (c) is a side view. (A) is a top view of a cylindrical space part same as the above, (b) is a front sectional view. It is a side view of the cylindrical space part same as the above. (A) is a front view of the upper-fire type pottery using the same long surface combustion burner, and (b) is a side view. It is a top view of an upper-fire type pottery same as the above. It is explanatory drawing of the internal structure of an upper-fire type pottery same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Long surface combustion burner 1A Metal knit burner 2 Combustion surface 3 Premixed gas 4 Gas outlet 5 Open hole 6 Uniform plate 6a Center part 6b End part 7 Heat-resistant metal fiber 8 Cylindrical space part 8a, 8b End part 9 Gas intake Mouth 10 Upper-fired pottery 11 First baffle plate 12 Second baffle plate 14 Upper-burner 15 Pottery support 16 Water tank

Claims (4)

A long surface combustion burner having a long and narrow combustion surface and a gas outlet for supplying premixed gas toward the combustion surface behind the center of the combustion surface, the elongated combustion surface and the gas outlet between placing a uniform plate elongated having a plurality of openings, and forming as toward the both ends than the central portion of uniform plate opening area of the plurality of openings is increased A cylindrical space part for temporarily storing the premixed gas behind the uniform plate, a gas intake port is provided on the end side of the cylindrical space part, and the gas outlet is located on the center side of the cylindrical space part. And a first baffle plate for diffusing the premixed gas taken from the gas intake port to both ends of the cylindrical space portion between the gas intake port and the gas outlet port in the cylindrical space portion. A long surface combustion burner characterized by being arranged .   The long surface combustion burner according to claim 1, wherein the combustion surface is a metal knit burner formed by knitting heat-resistant metal fibers in a knit shape. 2. A second baffle plate for diffusing the premixed gas flowing out from the gas outlet to both ends of the uniform plate is disposed between the gas outlet and the uniform plate. Or the long surface combustion burner of 2. Long surface combustion burners according to any one of claims 1 to 3, characterized in that the formation of the respective openings formed in said uniform plate with a circular hole.

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