JP3947514B2 - Metal knit burner - Google Patents

Description

  The present invention relates to a metal knit burner, and more particularly to a technique for preventing ignition failure over time.

  2. Description of the Related Art Conventionally, a metal knit burner is known in which a combustion surface is formed by knitting heat-resistant metal fibers in a knit shape, and a premixed gas supplied to the combustion surface is ignited by discharge (see, for example, Patent Document 1).

In general, the ignition method of the metal knit burner includes a piezoelectric ignition or a continuous spark ignition method. Moreover, the outer peripheral part of the heat-resistant metal fiber 7 of the knit net | network which comprises a combustion surface is being fixed by the flange part of the burner housing. Conventionally, the combustion surface is used as a discharge target, and the premixed gas is ignited by sparking between the discharge electrode and the combustion surface. For this reason, if ignition and extinguishing are repeated, as shown in FIG. 7, the refractory metal fiber 7 of the knit net is bent with time and comes into contact with the tip 32a of the discharge electrode 32, so that the ignition device 30 'does not ignite. Further, as shown in FIG. 8, the knitted net heat-resistant metal fiber 7 may protrude from the thread-like fiber end portion 2b into the discharge space, and the discharge space distance G is ensured despite the fact that the discharge space distance G is secured. There was a problem of sparking in places other than where it could be ignited.
Utility Model Registration No. 3014297

  The present invention was invented in view of the above-described conventional problems, and an object of the present invention is to provide a metal knit burner capable of obtaining reliable ignition energy by eliminating ignition failure over time. .

  In order to solve the above problems, in the present invention, the combustion surface 2 is formed by knitting heat-resistant metal fibers 7 in a knit shape, and the premixed gas 3 supplied to the combustion surface 2 is ignited by the discharge of the ignition device 30. A metal knit burner is disposed, and a target member 31 serving as a discharge target is disposed along the combustion surface 2, the tip 31 a of the target member 31 is opposed to the tip 32 a of the discharge electrode 32, and the target member 31 is combusted. A planar restraining portion 33 for restraining the surface portion 2a in the vicinity of the electrode on the surface 2 is provided integrally.

  With such a configuration, the premixed gas 3 is ignited by sparking between the discharge electrode 32 and the target member 31 with the surface suppressing portion 33 suppressing the surface portion 2a in the vicinity of the electrode of the combustion surface 2. Therefore, the surface portion 2b in the vicinity of the electrode facing the discharge electrode 32 of the combustion surface 2 is not bent over time by the planar suppressing portion 33, and the end portion of the fiber-shaped fiber of the heat-resistant metal fiber 7 is not bent. Since it can be prevented from protruding into the discharge space, the discharge ignition performance can be stabilized over time. Furthermore, by providing the planar holding portion 33 integrally with the target member 31, an increase in the number of components can be prevented.

  In addition, it is preferable to form the planar restraining portion 33 in a disc shape. In this case, the restraining area of the combustion surface 2 by the planar restraining portion 33 can be widened, and yet it is a useless corner portion unlike a square plate or the like. Therefore, the surface portion 2a to be suppressed of the combustion surface 2 can be efficiently suppressed, and ignition failure can be more efficiently and reliably prevented.

  According to the present invention, the discharge space distance can be kept constant at all times, so that the discharge ignition performance can be stabilized with time and reliable ignition energy can be obtained.

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

  The metal knit burner 1 according to the present embodiment is used, for example, in an upper-fire type pottery device 10 shown in FIG. The upper-fire type pottery device 10 is used, for example, as a commercial yakitori device. The metal-knit burner 1 is installed as an upper-fire burner above the pottery support 15 on which the object to be fired is placed. A saucer or a water tank 16 for receiving oil or the like from the fired product is disposed below the ceramic support 15. In addition, 31 in FIG. 3 is a top plate with an exhaust hole.

  A metal knit burner 1 according to the present invention is shown in FIGS. The combustion surface 2 of the metal knit burner 1 is formed long and narrow as shown in FIG. The combustion surface 2 is made of a metal knit material in which heat-resistant metal fibers 7 are knitted, and an outer peripheral portion thereof is fixed to a flange portion 28 a on the lower outer periphery of the burner housing 28.

  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 through which the premixed gas 3 passes. The premixed gas 3 from the gas outlet 4 is prevented from excessively flowing into the center of the combustion surface 2 and is burned. Temperature unevenness can be prevented by spreading to both ends of the surface 2.

  Behind the uniform plate 6 is provided a cylindrical space 8 for temporarily storing the premixed gas 3. A gas outlet 4 is provided on the center side of the cylindrical space 8, and a gas inlet 9 is provided on the one end 8 a side of the cylindrical space 8. The fuel gas supplied from the gas pipe is premixed with primary air by a mixer (not shown), and this premixed gas 3 is introduced into the cylindrical space 8 from the gas inlet 9 by a direct current fan (not shown). Inflow.

  Further, as shown in FIG. 4, a first baffle plate 11 is erected in the cylindrical space portion 8 so as to block between the gas inlet 9 and the gas outlet 4. The baffle plate 11 prevents the premixed gas 3 from flowing out of the gas outlet 4 directly, and as shown in FIG. 5, the premixed gas is supplied from the vents 19 on both sides of the baffle plate 11. 3 can pass through. As a result, a part of the premixed gas 3 hits the first baffle plate 11 and rebounds, or the remaining part passes through the ventilation portion 19, so that the premixed gas 3 reaches the both end portions 8 a and 8 b of the cylindrical space portion 8. It spreads and is uniformly dispersed in the cylindrical space 8 and flows out from the gas outlet 4 when the gas pressure increases.

  Further, a second baffle plate 12 facing the central portion 6 a of the uniform plate 6 is disposed below the gas outlet 4. The baffle plate 12 is formed in a bowl shape when viewed from the side. When the premixed gas 3 flowing out from the gas outlet 4 hits the second baffle plate 12, the premixed gas 3 is in the center of the uniform plate 6. As shown by the arrow b in FIG. 4A, the premixed gas 3 diffuses toward the both end portions 6b and 6b of the uniform plate 6 as shown in FIG. The mixed gas 3 reaches the both end portions 6b and 6b of the uniform plate 6. Reference numeral 17 in FIG. 5 denotes a fixing plate that supports the tip of the metal knit burner 1.

  In the present invention, as shown in FIG. 1, an ignition device 30 is disposed below the combustion surface 2. The ignition device 30 includes a discharge electrode 32 for spark discharge, a target member 31 to be a target for discharge, a discharge electrode 32 and a target member in a state where a tip 31a of the target member 31 and a tip 32a of the discharge electrode 32 face each other. And an electrical insulator 34 such as glass that supports the substrate 31. The electrical insulator 34 has a flat shape, and is provided with, for example, a mounting hole 35 that is fixed to the burner housing with screws or the like. The discharge electrode 32 is connected to the power supply side, and the target member 31 is connected to the ground side. Here, the discharge electrode 32 protrudes from the electric insulator 34 and is formed in an approximately L shape inclined obliquely upward, while the target member 31 protrudes from the electric insulator 34 and bends right above. The target member 31 and each of the tip portions 31a and 32a of the discharge electrode 32 are closest to each other with a discharge space distance G (set gap) therebetween. It has become.

  Further, a plate-like surface holding portion 33 is integrally provided on the upper surface of the tip portion 31 a of the target member 31. In this example, the planar holding portion 33 is made of a heat-resistant metal plate and is fixed to the target member 31 by spot welding or the like. As shown in FIG. 2, the shape of the planar restraining portion 33 is formed in a disk shape in plan view, and has a structure that restrains the surface portion 2 a near the electrode of the combustion surface 2 from below. The planar shape suppressing portion 33 is not limited to a disc shape, and may be a square plate shape such as a quadrangle, and the shape is not particularly limited.

  According to the above configuration, when the ignition operation is performed, the premixed gas 3 flows out from the gas outlet 4 of the cylindrical space 8 and is uniformly distributed by the uniform plate 6 and then uniformly supplied over the entire combustion surface 2. Is done. At this time, ignition is performed by a spark discharge between the discharge electrode 32 and the target member 31, and the entire combustion surface 2 is red-heated and burns uniformly.

  Here, the premixed gas 3 can be ignited by sparking between the discharge electrode 32 and the target member 31 in a state where the surface portion 2a in the vicinity of the electrode of the combustion surface 2 is suppressed by the planar suppressing portion 33. That is, instead of using the combustion surface 2 as a discharge target as in the prior art, a target member 31 serving as a discharge target is disposed along the combustion surface 2. Since the surface portion 2a in the vicinity of the electrode is suppressed, it is possible to prevent poor ignition due to the deflection of the combustion surface 2 over time, and the fiber-like fiber end portion 2b (FIG. 8) of the heat-resistant metal fiber 7 enters the discharge space. Therefore, the discharge space distance G can be kept constant at all times, and no spark is generated outside the place where ignition can be surely performed. As a result, the discharge ignition performance can be stabilized over time, and a reliable ignition energy can be obtained.

  In addition, by forming the planar restraining portion 33 in a disc shape, the restraining area of the combustion surface 2 can be increased, and unlike the square plate or the like, there is no useless corner, so the restraining of the combustion surface 2 is suppressed. There is an advantage that the desired surface portion 2a can be efficiently suppressed. Furthermore, it is possible to fix the discharge electrode 32 and the target member 31 in an insulated state simply by screwing the electric insulator 34 to the burner housing 28 side, and it takes less time to mount the discharge electrode 32 and the target member. 31 can be easily arranged at a predetermined position, and the ignition device 30 can be assembled accurately. In addition, since the planar restraining portion 33 is provided integrally with the target member 31, there is an advantage that an increase in the number of components can be prevented.

  Further, the metal knit burner 1 of this example has the following effects as compared with 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 1 can secure a large heat load, so it can solve the problems of ceramic burners, and it is thin and compact. Easy to handle because it does not take up installation space, (5) is strong against external impacts, (6) is quick in heating and cooling, halves the preheating time, and can increase the turndown ratio. At the same time, the effect of realizing high-efficiency operation, (7) The effect of reducing the pressure loss of the burner, (8) The effect of high-efficiency heating by radiation from the burner surface and convection of high-temperature fuel gas, There is no generation of substances 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 structure in which the discharge target member 31 is arranged along the combustion surface 2 and the surface for suppressing the surface of the combustion surface 2 are further provided. By adopting the structure provided with the shape restraining portion 33, there is an original effect that cannot be obtained by the conventional metal knit burner, that is, the discharge ignition performance of the ignition device 30 is stabilized with time.

  The metal knit burner 1 according to the present invention is widely applicable to various heat treatment related fields such as cooking appliances other than gas combustors, and further heating, boilers, dryers and the like.

It is a side view explaining the positional relationship of the ignition device of a metal knit burner used for one Embodiment of this invention, and a combustion surface. It is a top view of an ignition device same as the above. It is a perspective view of the top-fire type pottery using the same metal knit burner. (A) is a partially cutaway front view of the same 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. It is explanatory drawing of the state which the conventional combustion surface drooped and contacted the discharge electrode. It is explanatory drawing when the fiber of the conventional combustion surface hangs down and discharges other than a setting gap.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal knit burner 2 Combustion surface 2a Surface part 7 Heat-resistant metal fiber 30 Ignition device 31 Target member 31a Tip 32 Discharge electrode 32a Tip 33 Planar shape suppression part

Claims (2)

  A metal knit burner having a combustion surface formed by knitting heat-resistant metal fibers in a knit shape and igniting a premixed gas supplied to the combustion surface by discharge, and a target member that is a discharge target along the combustion surface The metal knit burner is characterized in that the tip of the target member is opposed to the tip of the discharge electrode, and the target member is integrally provided with a planar restraining portion for restraining the surface portion of the combustion surface near the electrode. .   2. The metal knit burner according to claim 1, wherein the planar restraining portion is formed in a disc shape.

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