JP2847545B2 - Flame holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention [Industrial Application Field] The present invention relates to a cylindrical base for an open end of a metal pipe for guiding combustion gas received from a combustion gas supply pipe. One end of the cylindrical base is attached to a combustion portion formed at the other end of the cylindrical base, and a flame stabilizer for burning a combustion gas by spark discharge between the spark rod and the cylindrical base. Both portions are formed of a conductive ceramic material, and the tip of a fixing screw screwed into a screw hole in the peripheral surface of the opening end of the metal pipe is engaged with the locking recess on the peripheral surface of one end of the cylindrical base. The present invention relates to a flame stabilizer inserted and attached to an open end of a metal pipe.

[Prior Art] Conventionally, as a flame stabilizer of this type, a cylindrical base for attaching to an opening end of a metal pipe and a cylinder base are integrally connected to each other to burn combustion gas with combustion air. In which the combustion part for this purpose is formed entirely of a metal material such as stainless steel has been proposed.

[Problems to be Solved] However, in the conventional flame stabilizer, since it is formed of a metal material such as stainless steel, when the amount of heat generated due to combustion of the combustion gas increases and becomes high temperature,
There is a disadvantage that (i) oxidation consumption becomes excessive, and (ii) a service life is shortened.

In view of the above, an object of the present invention is to provide a flame stabilizer in which both a tubular base and a combustion part are formed of a conductive ceramic material in order to eliminate these disadvantages.

(2) Configuration of the Invention [Means for Solving the Problem] The solution for the problem provided by the present invention is as follows: "The base portion of the spark rod whose distal end protrudes outward from the open end portion is the base portion. The combustion gas supplied to the base from the combustion gas supply pipe is guided toward the open end, and the base is connected to the power supply together with the base end of the spark rod. One end of the base is attached, and the combustion gas supplied from the open end of the metal pipe is guided toward the combustion portion formed at the other end, and is burned by a spark discharge by a spark rod at the combustion portion. In the flame stabilizer, the combustion part in which at least one air supply hole is formed in the cylindrical base and the connecting part to the other end of the cylindrical base is formed of a conductive ceramic material. A plurality of combustion gas supply holes are formed in a disk-shaped peripheral portion formed by holding a spark rod in a central holding hole through an insulating layer. A fixing screw that is connected to the peripheral surface and is screwed into a screw hole on the peripheral surface of the opening end of the metal pipe when one end of the cylindrical base is inserted into and attached to the opening end of the metal pipe. Characterized in that the distal end of the flame holder is engaged with a locking recess formed on the peripheral surface of one end of the cylindrical base with a conductive buffer member disposed on the peripheral surface of the one end interposed therebetween. .

[Operation] The flame stabilizer according to the present invention is, as clearly indicated in the above [Means for Solving the Problems], the base portion of the spark rod whose distal end protrudes outward from the open end. Holds and guides the combustion gas supplied to the base from the combustion gas supply pipe toward the open end, and the base is connected to the power supply with the base end of the spark rod. One end of the base is attached, and the combustion gas supplied from the open end of the metal pipe is guided toward the combustion portion formed at the other end, and is burned by a spark discharge by a spark rod in the combustion portion. A firearm, especially
A cylindrical base and a combustion part in which at least one air supply hole is formed at a connecting part to the other end of the cylindrical base are both formed of a conductive ceramic material, and are formed of a disc-shaped conductive ceramic material. A plurality of combustion gas supply holes are formed in the peripheral portion, and a holding portion for holding the spark rod via an insulating layer in the center holding hole is provided continuously with the inner peripheral surface of the other end of the cylindrical base. When one end of the cylindrical base is inserted into and attached to the open end of the metal pipe, the distal end of the fixing screw screwed into the screw hole on the peripheral surface of the open end of the metal pipe is attached to the cylindrical base. (I) The amount of heat generated due to the combustion of the combustion gas increases because the conductive cushioning member disposed on the one end peripheral surface is interposed and engaged with the locking concave portion on the one end peripheral surface. No action to prevent oxidative consumption even at high temperatures An action that prolonged the thus (ii) service life.

(Iii) Air and combustion gas are mixed in the combustion part, and the combustion part and the inside of the cylindrical base part are separated by the holding part, so that there is no backflow of flame and the operation is safe. (Iv) The tip part of the spark rod Is held in the holding hole of the holding portion via the insulating layer, so that the position of the spark rod is accurately positioned and fixed around the tip of the spark rod. (V) A conductive buffer member is provided on the peripheral surface of one end of the cylindrical base. Since it is arranged and the tip of the fixing screw is engaged with the locking recess through the cushioning member, the effect of absorbing and relaxing the difference in thermal expansion between the metal pipe main body and the cylindrical base and the stress of the fixing screw is obtained. Embodiment] Next, a preferred embodiment of the flame stabilizer according to the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments described below are described for facilitating or facilitating the understanding of the present invention, but not for limiting the present invention. In other words, each member disclosed in the embodiments described below includes all design changes and equivalent replacements that fall within the spirit and scope of the present invention.

(Description of Additional Drawing) FIG. 1 is a cross-sectional view showing an embodiment of a flame stabilizer according to the present invention.

(Configuration of Example) First, the configuration of an example of the flame stabilizer according to the present invention will be described in detail with reference to FIG.

Reference numeral 10 denotes a flame stabilizer according to the present invention, which is used by being attached to an open end of a metal pipe 20 , and a cylindrical base 11, a combustion part 12, and a holding part 13 are integrally formed of a conductive ceramic material as a whole. Is formed.

The cylindrical base 11 of the flame stabilizer 10 according to the present invention has one end 11A.
Is inserted into and attached to the open end 21A of the metal pipe body 21 contained in the metal pipe 20 , and the combustion gas (eg, natural gas) given from the open end 21A of the metal pipe body 21 is supplied to the other end. Guided to part 11B.

In the cylindrical base 11, the thickness of the one end 11A is reduced as desired. One end 11A of the cylindrical base 11 is inserted into the open end 21A of the metal pipe main body 21 and, when inserted and attached, engages the tip of the fixing screw 22 to stabilize the peripheral surface. At least one locking recess 11a is formed. A buffer member 11b made of a copper film or the like may be disposed on the peripheral surface of the one end portion 11a of the cylindrical base 11 for the purpose of stabilizing the fixation by the distal end portion of the fixing screw 22 as needed (hereinafter, this is referred to as a "buffer"). The case will be described). At one end 11A of the cylindrical base 11, adhesive layers 11c and 11d made of a heat-resistant adhesive are used for the purpose of preventing the leakage of the combustion gas within a range that does not block the conductive path between the metal pipe main body 21. It may be formed.

The combustion part 12 of the flame stabilizer 10 according to the present invention is connected to the other end part 11B of the cylindrical base 11, and combustion gas is burned in the internal space. The combustion part 12 has a cylindrical base 11
At least one air supply hole 12a is formed in a portion connecting to the other end 11B of the air supply port.

The holding portion 13 of the flame stabilizer 10 according to the present invention is provided continuously with the inner peripheral surface of the other end portion 11B of the cylindrical base portion 11, and the combustion gas is supplied to the peripheral portion of the holding portion 13 in the internal space of the combustion portion 12. Combustion gas supply holes 13a are formed at desired angular intervals for supply toward the center, and a later-described spark rod 25 is formed in the center of the insulating layer 14a.
It has a holding hole 13b for holding it through.

The metal pipe 20 has a metal pipe main body 21 in which one end 11A of the cylindrical base 11 of the flame stabilizer 10 is inserted and attached to the open end 21A, and a peripheral surface of the open end 21A of the metal pipe main body 21. When screwed into the formed screw hole 21a, the tip end is
A fixing screw 22 which presses 1b and is engaged with the locking recess 11a,
A combustion gas supply pipe 23 that is open to the base 21B of the metal pipe body 21 and supplies combustion gas from a combustion gas supply source (not shown), and an insulating layer for the base 21B of the metal pipe body 21. And a power supply terminal 27 for connecting the spark rod 25 and the metal pipe main body 21 to an appropriate power supply (not shown) via a power supply line 26. Have. The tip of the spark rod 25 extends through the internal space of the cylindrical base 11 of the flame stabilizer 10 and then protrudes from the internal space of the combustion part 12 (that is, the combustion space).

(Assembly Capacity) Further, an assembly area of an embodiment of the flame stabilizer according to the present invention will be briefly described with reference to FIG.

The flame stabilizer 10 according to the present invention has an end portion of the cylindrical base portion 11.
A heat-resistant adhesive for arranging the cushioning member 11b on the periphery of the 11A and for preventing the leakage of the combustion gas to the front end face and the step end face (this forms the adhesive layers 11c and 11d).
Is inserted into the open end 21A of the metal pipe main body 21 in a state where is disposed.

At this time, the spark rod 25 is
It is inserted into 13b and is held via the insulating layer 14.

After that, the fixing screw 22 is screwed into the screw hole 21a of the metal pipe main body 21 so that the cushioning member is formed at the tip.
11b is pressed to engage the locking recess 11a.

As described above, the flame stabilizer 10 according to the present invention is a metal pipe.
Mounted against 20 .

(Operation of Embodiment) In addition, the operation of an embodiment of the flame stabilizer according to the present invention will be described in detail with reference to FIG.

Flame holder 10 according to the present invention is supplied as indicated by arrow A ₁ from the combustion gas supply by the combustion gas supply pipe 23 arrow
The combustion gas guided as shown by A ₂ is
Combustion space of the After guided to the holding member 13 by the receiving tubular base portion 11 from the opening end portion 21A, as shown by arrow A ₃ via the combustion gas supply hole 13a formed in the peripheral edge portion of the holding member 13 combustion section 12 To supply.

In the combustion space of the combustion section 12, the combustion gas flows through the air supply holes 12a.
After being mixed with the combustion air given as indicated by an arrow B, the fuel gas is ignited by the spark discharge generated between the spark rod 25 and the inner peripheral surface of the combustion portion 12 and burned.

(Specific Example) In addition, in order to facilitate understanding of the flame stabilizer according to the present invention, specific description will be given using numerical values and the like.

Example 1 One end of a tubular base of a flame stabilizer made by reaction sintering using silicon carbide had an inner diameter of 15.5 mm and an outer diameter of 15.5 mm.
It was 21.8 mm, and three locking recesses having a diameter of 4 mm and a depth of 1 mm were formed by sandblasting at equal angular intervals with respect to the peripheral surface.

The open end of the metal pipe body made of stainless steel (Japanese Industrial Standard SUS310) has an inner diameter of 22.2 mm and an outer diameter of 30 mm, and is 4 mm in diameter at equal angular intervals with respect to the peripheral surface. Three screw holes were formed.

One end of the cylindrical base of the flame stabilizer has a thickness of 0.
The copper buffer member 2 having a width of 05 mm and a width of 25 mm was wound twice and inserted into the opening end of the metal pipe body.

In the locking concave portion formed on the peripheral surface at one end of the cylindrical base portion of the flame stabilizer, the tip of a hexagonal-hole fixing screw screwed into the screw hole of the metal pipe main body via a buffer member. I was involved.

As described above, after the flame stabilizer is inserted into the metal pipe main body and attached, the flame stabilizer is installed in the combustion furnace in a well-known manner, and while the natural gas is supplied from the combustion gas supply pipe as the combustion gas, the flame stabilizer is placed in an air atmosphere. The temperature was kept at 500C for 500 hours.

After that, the flame stabilizer stopped the supply of the combustion gas from the combustion gas supply pipe to terminate the combustion, cooled the combustion furnace, removed it from the combustion furnace, and observed it visually. There was no abnormal looseness in the state of attachment to the part, and no damage such as cracks was observed.

Example 2 One end of a tubular base of a flame stabilizer made by reaction sintering using silicon carbide had an inner diameter of 15.5 mm and an outer diameter of 15.5 mm.
It is 21.8 mm, and three engagement recesses having a diameter of 4 mm and a depth of 1 mm are formed at equal angular intervals with respect to the peripheral surface by a sandblast method.

The open end of the metal pipe body made of stainless steel (Japanese Industrial Standard SUS310) has an inner diameter of 22.2 mm and an outer diameter of 30 mm, and is 4 mm in diameter at equal angular intervals with respect to the peripheral surface. Three screw holes were formed.

One end of the cylindrical base of the flame stabilizer has a thickness of 0.
A copper cushioning member with a width of 25 mm and a width of 25 mm is double-wrapped, and a heat-resistant adhesive (“Aron Ceramics” manufactured by Toa Gosei Chemical Co., Ltd.) is applied to the tip and step end faces, and then the metal pipe body At the open end.

In the locking concave portion formed on the peripheral surface at one end of the cylindrical base portion of the flame stabilizer, the tip of a hexagonal-hole fixing screw screwed into the screw hole of the metal pipe main body via a buffer member. I was involved.

As described above, the flame stabilizer is inserted into the metal pipe body and attached, and then installed in the combustion furnace in a known manner,
While being supplied with natural gas as a combustion gas from a combustion gas supply pipe, the temperature was maintained at a temperature of 600 ° C. for 500 hours in an air atmosphere.

After that, the flame stabilizer stopped the supply of combustion gas from the combustion gas supply pipe to terminate the combustion, cooled the combustion furnace, removed it from the combustion furnace, and visually inspected it. There was no abnormal looseness in the state of attachment to the device, and no damage such as cracks was observed.

(Modification) In the above description, the opening end of the metal pipe main body 21 is described.
Although a step end surface is formed in which the end surface of the distal end portion 11A of the cylindrical base 11 is in contact with the inner peripheral surface of 21A, the present invention is not limited to this. It is included even if it is removed.

Further, in the above description, the stepped section in which the end surface of the open end 21A of the metal pipe main body 21 is in contact with the peripheral surface of the distal end 11A of the cylindrical base 11, is formed. However, the present invention is not limited to the case, and the case where the step end face is removed is also included.

(3) Effects of the present invention As is clear from the above, the flame stabilizer according to the present invention has the following features.
As disclosed in the above [Means for Solving the Problems], the base portion holds the base end of the spark rod protruding outward from the open end at the base and is provided to the base from the combustion gas supply pipe. One end of the tubular base is attached to the open end of the metal pipe whose base is connected to the power source together with the base end of the spark rod and the combustion gas guided toward the open end. A flame stabilizer that guides a combustion gas given from an open end toward a combustion portion formed at the other end portion and burns it by a spark discharge by a spark rod in the combustion portion, particularly a cylindrical base and Both the combustion part is formed of a conductive ceramic material, and when one end of the cylindrical base is inserted and attached to the open end of the metal pipe, it is screwed into a screw hole on the peripheral surface of the open end of the metal pipe. Fixing screw Since the distal end is engaged with the locking concave portion on the peripheral surface of one end of the cylindrical base, (i) the amount of heat generated by combustion of the combustion gas increases, and even if the temperature becomes high, it is oxidized and consumed. (Ii) The effect of extending the useful life (iii) The air and the combustion gas are mixed in the combustion section, and the combustion section and the inside of the cylindrical base are separated by the holding section. (Iv) Since the tip of the spark rod is held in the holding hole of the holding part via the insulating layer, the effect of accurately positioning and fixing the spark rod at the center is provided. (V) Since a conductive buffer member is disposed on the peripheral surface of one end of the cylindrical base and the tip of the fixing screw is engaged with the locking recess through the buffer member, the metal buffer body and Absorbs the thermal expansion difference of the cylindrical base and stress of the fixing screw It has the effect of.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a flame stabilizer according to the present invention. 10 flame stabilizer 11 cylindrical base 11A one end 11B other end 11a locking recess 11b cushioning member 11c, 11d adhesive layer 12 burning part 12a Air supply hole 13 Holder 13a Combustion gas supply hole 13b Holder 14 Insulating layer 20 Metal pipe 21 Metal pipe body 21A Open end 21B Base 21a Screw Hole 22… Fixing screw 23… Combustion gas supply pipe 24… Insulating layer 25… Spark rod 26… Power supply line 27… Power supply terminal

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masatoshi Onishi 30 Soya, Hadano-shi, Kanagawa Toshiba Ceramics Co., Ltd. Central Research Laboratory (56) References JP-A-58-148411 (JP, A) (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F23D 14/26 F23D 14/74 F23Q 3/00 102

Claims (1)

(57) [Claims] 1. A spark rod whose tip end projects outward from an open end holds a base end of the spark rod at a base and directs combustion gas supplied to the base from a combustion gas supply pipe toward the open end. One end of the cylindrical base is attached to the open end of the metal pipe whose base is connected to the power source together with the base end of the spark rod, and the combustion gas supplied from the open end of the metal pipe In the flame holder which is guided toward the combustion portion formed at the other end portion and is burned by spark discharge by the spark rod in the combustion portion, at least the cylindrical base portion and the connecting portion to the other end portion of the cylindrical base portion. The combustion part in which one air supply hole is formed is both formed of a conductive ceramic material, and a plurality of combustion gas supply holes are formed in a disk-shaped peripheral portion formed of the conductive ceramic material. A holding portion for holding the spark rod via the insulating layer in the holding hole of the core portion is provided continuously with the inner peripheral surface of the other end of the cylindrical base, and one end of the cylindrical base has an opening of the metal pipe. When inserted and attached to the end, the distal end of the fixing screw screwed into the screw hole in the peripheral surface of the open end of the metal pipe has one end surrounding the locking recess on the peripheral surface of one end of the cylindrical base. A flame stabilizer characterized by being engaged with a conductive buffer member disposed on a surface.