JPH0814561A - Pilot torch - Google Patents

Abstract

PURPOSE:To suppress effectively a rise in temperature of a torch inner tube due to a combustion reaction of main fuel in a passage of combustion gas for ignition and to prevent occurrence of erosion or the like of a component member of a pilot tor ch due to a thermal load, by making fuel for cooling flow through a passage of the fuel for cooling. CONSTITUTION:This pilot torch is equipped with a torch inner tube 1 inside of which a passage 2 of combustion gas for ignition extending from an end part on the one end A side to an end part on the other end B side is provided, and a torch outer tube 3 is provided so that it surrounds the inner tube and in such a manner that the end part on the A side thereof is welded onto the end part on the A side of the torch inner tube 1 and that a passage 7 of fuel for cooling is formed between it and the outer peripheral surface of the torch inner tube 1. A main fuel supply pipe 15 and an oxidizing agent supply pipe 21 are provided in the part to the A side of the passage 2 of the combustion gas for ignition in which a spark plug 27 is provided, while a supply pipe 9 of the fuel for cooling is provided in the part to the A side of the passage 7 of the fuel for cooling. The torch inner tube 1 is cooled by making the fuel flow through the passage 7 of the fuel for cooling and thereby a rise in temperature thereof is suppressed effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition torch applied to a two-liquid type propulsion device for rockets.

[0002]

2. Description of the Related Art In a two-liquid type propulsion apparatus applied to a rocket or the like, thrust is generated by burning a mixed gas of a fuel such as hydrogen and an oxidant such as oxygen mixed in a main combustion chamber. .

To operate the two-component propulsion device, an ignition torch having a spark plug is arranged inside the main combustion chamber, and the ignition torch is supplied to the inside of the main combustion chamber. The fuel / oxidant for power generation is provided in a system different from that of the fuel / oxidant for ignition.

When the two-liquid type propulsion device is operated, the ignition torch is supplied with the ignition fuel and the oxidant, and the spark plug is used to generate a discharge spark to ignite the fuel and the oxidizer. By igniting and burning a mixed gas of the above, a combustion gas flow for ignition having a temperature of about 2000 ° C. is generated, and this combustion gas flow is used as a pilot fuel for the propulsion fuel and oxidant supplied to the main combustion chamber. The mixed gas with is ignited.

Usually, in a two-component type propulsion device, a mixed gas of an ignition fuel and an oxidizer is ignited and burned by an ignition torch only once when a rocket or the like is launched. When performing the combustion test of No. 1, the same two-liquid type propulsion device is ignited multiple times in the test stand.

[0006]

However, in the above-described ignition torch, the temperature of the combustion gas flow for ignition is about 200.
Since the temperature is around 0 ° C, if a combustion gas flow is generated, several tens of degrees
Erosion due to heat load occurs in each member constituting the ignition torch in about a second.

For this reason, when the combustion test for the same two-liquid type propulsion device is performed a plurality of times in the test stand, it is necessary to prepare a new ignition torch each time each test is carried out.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and has an object to reduce a heat load acting on an ignition torch.

[0009]

In order to achieve the above object, in the ignition torch of the present invention, an ignition combustion gas passage 2 extending from one end A side end to the other end B side end is provided inside. The torch inner cylinder 1 and the one end A side end portion thereof are in close contact with the one end A side end portion of the torch inner cylinder 1 and the cooling fuel flow path 7 is formed between the torch inner cylinder 1 and the outer peripheral surface thereof. A main fuel supply pipe 1 that communicates with a torch outer cylinder 3 that surrounds the torch inner cylinder 1 and a portion of the combustion gas flow path 2 for ignition that is closer to one end A side.
5 and the oxidant supply pipe 21, the cooling fuel supply pipe 9 communicating with the portion of the cooling fuel flow passage 7 near the one end A side, and a discharge spark is generated toward the ignition combustion gas flow passage 2. It has a configuration including a spark plug 27.

Further, the above-mentioned main fuel supply pipe 15 and oxidant supply pipe 21 are provided with flow rate adjusting means 16 and 22, so that the flow rate of the oxidant supply pipe 21 becomes excessive with respect to the flow rate of the main fuel supply pipe 15. The flow rate adjusting means 16 and 22 are set.

Further, the flow passage cross-sectional shape of the cooling fuel flow passage 7 described above is set so that the flow passage cross-sectional area becomes the minimum near the other end B side end portion.

Furthermore, one end A of the combustion gas passage 2 for ignition is used.
A hollow member 17 that communicates with the ignition combustion gas flow channel 2 in a substantially coaxial manner is provided at a side end portion thereof, and a spark generating portion 29 of a spark plug 27 is arranged inside the hollow member 17 to form the hollow member 1.
A plurality of protrusions 30 projecting to the vicinity of the spark generating portion 29 of the spark plug 27 are provided on the inner peripheral portion of the spark plug 7, and the oxidizing gas is ignited by the combustion gas flow passage through a space 31 formed between the protrusions 30. The oxidant supply pipe 21 is connected to the hollow member 17 so as to be supplied to the hollow member 17.

[0013]

In the ignition torch of the present invention, the cooling fuel Fc is circulated from the cooling fuel supply pipe 9 to the cooling fuel flow passage 7, and the cooling fuel Fc is supplied.
Thus, the torch inner cylinder 1 is effectively cooled from the outer peripheral surface side thereof.

Further, when the flow rate adjusting means 16 and 22 are provided, the main fuel Fm supplied from the main fuel supply pipe 15 to the ignition combustion gas flow passage 2 is supplied from the oxidant supply pipe 21 to the combustion gas flow passage for ignition. The flow rate of the oxidant O supplied to 2 is made excessive, and the temperature of the combustion gas flow G ₁ in the combustion gas flow passage 2 for ignition is made relatively low.

Further, if the cooling fuel flow passage 7 is formed so that the flow passage cross-sectional area is minimized near the other end B side end, the cooling fuel flow passage 7 is discharged from the torch outer cylinder 3 to the outside. By increasing the speed of the cooling fuel Fc, the cooling fuel Fc discharged from the cooling fuel passage 7 to the outside of the torch outer cylinder 3 and the cooling fuel Fc discharged from the combustion gas passage 2 to the outside of the torch inner cylinder 1. The combustion gas stream G ₁ is effectively mixed.

Furthermore, one end A of the combustion gas channel 2 for ignition is used.
A hollow member 17 is provided at a side end portion, a spark generating portion 29 of the spark plug 27 is arranged inside the hollow member 17, and a spark generating portion 29 of the spark plug 27 is disposed inside the hollow member 17.
On the other hand, when the plurality of protrusions 30 are provided so that a predetermined spark gap is formed, even if a large amount of the oxidant flows in the space 31, the ignition performance due to the discharge spark generated in the spark generation part 29 does not deteriorate.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the ignition torch of the present invention.

Reference numeral 1 denotes a torch inner cylinder, and an inner peripheral surface and an outer peripheral surface of the torch inner cylinder 1 gradually increase in inner diameter and end from the one end A side end portion to the middle part toward the other end B side end portion. The torch inner cylinder 1 is formed to have a funnel shape with a reduced outer diameter and to have a straight pipe shape in which the inner diameter and the outer diameter are substantially the same from the middle portion to the end portion on the other end B side. The inside is the ignition combustion gas flow path 2.

Reference numeral 3 denotes a torch outer cylinder, and one end A of the torch inner cylinder 1 is provided on an inner peripheral surface of an end portion of the torch outer cylinder 3 on the one end A side.
An annular outer fitting portion 4 that circumscribes the side end portion is provided, and the torch outer cylinder 3 is attached to the main combustion chamber wall of the rocket on the outer peripheral surface of the portion of the torch outer cylinder 3 near the other end B side. Provided support member 5
Is provided with a mounting flange portion 6 for mounting on.

The inner peripheral surface of the torch outer cylinder 3 gradually decreases in inner diameter toward the other end B side end portion from the other end B side end surface of the outer fitting portion 4 at the one end A side end portion to the intermediate portion. In addition, the inner diameter is formed to be substantially the same from the intermediate portion to the end portion on the other end B side.

The overall lengths of the torch inner cylinder 1 and the torch outer cylinder 3 are substantially equal to each other, and the outer peripheral surface of one end A side of the torch inner cylinder 1 is in close contact with the outer fitting portion 4 inside the torch outer cylinder 3. The outer peripheral surface of the torch inner cylinder 1 and the torch outer cylinder 3 are arranged as follows.
A cooling fuel passage 7 is formed between the inner peripheral surface and the inner peripheral surface.

Regarding the cross-sectional shape of the cooling fuel flow path 7, the cross-sectional area of the cooling fuel flow path 7 gradually decreases toward the other end B side between the one end A side end part and the middle part, and from the middle part. The flow passage cross-sectional areas are substantially the same up to the other end B side end portion.

Further, in the torch outer cylinder 3, the inside of the large diameter portion near the one end A side end, that is, the portion near the one end A side of the cooling fuel passage 7 and the outside of the torch outer cylinder 3. A cooling fuel supply hole 8 that communicates with the other side is formed.

Reference numeral 9 denotes a cooling fuel supply pipe, and the cooling fuel supply pipe 9 has its tip end joined to the cooling fuel supply hole 8, and a cooling fuel is supplied from a fuel supply source (not shown). The cooling fuel (hydrogen gas) Fc supplied to the supply pipe 9 is supplied to the cooling fuel passage 7.

Further, the cooling fuel supply pipe 9 is provided with an orifice 10 as a flow rate adjusting means for setting the flow rate of the cooling fuel Fc flowing through the inside thereof.

Reference numeral 11 is a hollow main fuel supply pipe mounting seat, and the main fuel supply pipe mounting seat 11 is the torch inner cylinder 1 described above.
And an annular base portion 12 that is in close contact with the end portion on the one end A side of the torch outer cylinder 3, and a tapered tubular pipe mounting portion 13 that is continuous with the base portion 12 and that gradually decreases in inner diameter and outer diameter toward the one end A side. The base 12 is fixed to the torch outer cylinder 3.

Further, a main fuel supply hole 14 is formed in the pipe mounting portion 13 of the main fuel supply pipe mounting seat 11 so as to connect the inside and outside of the pipe mounting portion 13.

Reference numeral 15 is a main fuel supply pipe, and the tip of the main fuel supply pipe 15 is joined to the main fuel supply hole 14.

Further, the main fuel supply pipe 15 is provided with an orifice 16 as a flow rate adjusting means for setting the flow rate of the main fuel (hydrogen gas) Fm flowing therein.

Reference numeral 17 denotes an oxidant supply pipe mounting seat having a hollow structure with one end A side end and the other end B side end open, and the inner peripheral surface and the outer peripheral surface of the oxidant supply pipe mounting seat 17 are at one end. A large diameter is formed between the A-side end portion and the middle portion, and a small diameter is formed between the middle portion and the other end B-side end portion. The other end B side of the oxidant supply pipe mounting seat 17 is formed. The spark generating chamber 23 is a portion near the inside, that is, the inside of the small diameter portion.

A portion of the oxidant supply pipe mounting seat 17 closer to the other end B side from the middle portion is internally provided in the main fuel supply pipe mounting seat 11, and the other end B side of the oxidant supply pipe mounting seat 17 is provided. The end portion is inscribed and fixed to the base portion 12, and the oxidant supply pipe mounting seat 17 is provided.
Since the middle part of the pipe is inscribed and fixed to the end on the one end A side of the pipe mounting portion 13, the one end A side end surface of the base 12 of the main fuel supply pipe mounting seat 11 and the inner peripheral surface of the pipe mounting portion 13 and the oxidizer are A main fuel chamber 18 is formed that is surrounded by the intermediate portion of the supply pipe mounting seat 17 and the outer peripheral surface from the other end B side.

At a portion of the oxidant supply pipe mounting seat 17 closer to the other end B side, a fuel discharge port 19 that connects the one end A side end of the ignition combustion gas flow path 2 and the main fuel chamber 18 described above. Are drilled at a plurality of locations in the circumferential direction.

The main fuel Fm supplied from the fuel supply source (not shown) to the above-mentioned main fuel supply pipe 15 passes through the main fuel chamber 18 and the fuel discharge port 19 and the combustion gas flow path 2 for ignition.
It is designed to flow into.

Further, the oxidant supply pipe mounting seat 17 is provided with an oxidant supply hole 20 for communicating the inside of the large-diameter portion near the one end A side end thereof, that is, the main fuel chamber 18 and the outside thereof. Has been done.

Reference numeral 21 is an oxidant supply pipe, and the tip of the oxidant supply pipe 21 is joined to the oxidant supply hole 20.

Further, the oxidant supply pipe 21 is provided with an orifice 22 as a flow rate adjusting means for setting the flow rate of the oxidant (oxygen gas) O flowing therein.

Reference numeral 24 denotes a plug mounting seat, and an outer peripheral surface of one end A side of the plug mounting seat 24 is an annular inscribed portion inscribed in the end A side end of the oxidant supply pipe mounting seat 17. 25
Are formed.

Also, one end A formed in the plug mounting seat 24
A spark plug 27 connected to a high voltage generator (not shown) is screwed into a plug mounting hole 26 penetrating from the side end portion to the other end B side end portion.

The plug mounting seat 24 has a portion closer to the other end B side than the inner contact portion 25 is internally provided in the oxidant supply pipe mounting seat 17, and the inner contact portion 25 corresponds to the oxidant supply pipe mounting seat 17. By being internally fixed to the end A side portion, an oxidant chamber 28 surrounded by the outer peripheral portion of the plug mounting seat 24 and the inner peripheral surface of the large diameter portion of the oxidant supply pipe mounting seat 17 is formed.

The oxidant O supplied from the oxidant supply source (not shown) to the oxidant supply pipe 21 is the oxidant chamber 2
8, through the spark generation chamber 23, the combustion gas flow path 2 for ignition
It is designed to flow into.

The spark generating portion 29 at the tip of the spark plug 27 is located near the fuel discharge port 19 of the spark generating chamber 23, and is used for ignition when a high voltage is applied to the spark plug 27. A discharge spark is generated toward the combustion gas passage 2.

Further, the orifices 10, 16 and 22 respectively provided in the cooling fuel supply pipe 9, the main fuel supply pipe 15 and the oxidant supply pipe 21 described above are provided in the combustion gas flow passage 2 for ignition. In order that the weight ratio of the hydrogen gas (main fuel Fm) and the oxygen gas (oxidant O) is about 1:50 (the oxidant O is rich in the main fuel Fm),
Further, hydrogen gas (cooling fuel Fc) and oxygen gas (residual oxidant that has not reacted with the main fuel Fm) at the combustion gas outlet of the torch (ends on the other end B side of the torch inner cylinder 1 and the torch outer cylinder 3) The weight ratio with O) is set to about 1: 6.

The torch inner cylinder 1, the torch outer cylinder 3, the main fuel supply pipe mounting seat 11, and the oxidant supply pipe mounting seat 1 described above are used.
7, each member such as the plug mounting seat 24 is made of stainless steel (SUS316).

The operation of this embodiment will be described below.

When the combustion gas flow G ₂ for ignition is generated by the torch, the main fuel supply pipe 15 is supplied from the fuel supply source.
The main fuel Fm, the oxidant O from the oxidant supply source to the oxidant supply pipe 21, and the cooling fuel Fc from the fuel supply source to the cooling fuel supply pipe 9.

Further, when the spark generator 27 of the spark plug 27 is used to generate a discharge spark in the spark generation chamber 23 by activating the high voltage generator, the main fuel supply pipe 15 causes the main fuel chamber 18 and the fuel discharge port 19 to move. A mixed gas of the main fuel Fm that flows into the combustion gas flow passage 2 for ignition and the oxidant O that flows into the combustion gas flow passage 2 for ignition from the oxidant supply pipe 21 to the oxidant chamber 28 and the spark generation chamber 23 is generated. Ignite and burn.

The combustion gas flow G ₁ of the mixed gas is discharged to the outside of the torch inner cylinder 1 while being accelerated by the inner peripheral surface shape of the torch inner cylinder 1 when flowing through the ignition combustion gas flow passage 2. .

The temperature of the combustion gas flow G _{1 in} the ignition combustion gas flow passage 2 is such that the weight ratio of the main fuel Fm supplied to the ignition combustion gas flow passage 2 and the oxidant O is about 1:50. Since the oxidant O is rich, the temperature is about 1700 ° C.

Further, the cooling fuel Fc is continuously circulated in the cooling fuel passage 7 and the torch inner cylinder 1 is
Is actively cooled from the outer peripheral surface side thereof, so that a large heat load due to the combustion reaction of the main fuel Fm does not act on the torch inner cylinder 1.

On the other hand, the cooling fuel Fc discharged from the cooling fuel flow path 7 to the outside of the torch outer cylinder 3 is accelerated due to the flow passage cross-sectional shape when flowing through the cooling fuel flow path 7. To be done.

Therefore, the cooling fuel Fc discharged from the cooling fuel flow path 7 to the outside of the torch outer cylinder 3 and the combustion gas flow G ₁ discharged from the combustion gas flow path 2 to the outside of the torch inner cylinder 1 are formed. A speed difference is generated between them, and the cooling fuel Fc and the combustion gas flow G ₁ are effectively mixed by this speed difference, and the combustion fuel flow path 2 for ignition mainly contained in the combustion gas flow G ₁ The remaining oxidant O that has not reacted with the fuel Fm and the cooling fuel Fc efficiently react and burn.

This cooling fuel Fc and combustion gas flow G
The temperature of the combustion gas flow for ignition (secondary combustion gas flow) G ₂ generated by the reaction with ₁ is the fuel F for cooling.
By appropriately adjusting the flow rate of c, it is possible to change the temperature to about 3000 ° C.

Thus, in this embodiment, the torch is
Combustion gas flow G inside the inner cylinder 1 ₁Temperature is about 170
It is about 0 ° C, and also flows through the cooling fuel flow path 7.
The torch inner cylinder 1 etc. is cooled by the cooling fuel Fc.
The combustion gas flow G for about 300 seconds.
₁Torch inner cylinder 1 and torch outer cylinder
Erosion on the components of ignition torch including 3
Etc. does not occur, therefore, for the same two-component propulsion device
Perform each test when conducting multiple combustion tests
No need to prepare a new ignition torch every time
It

Further, since the combustion gas flow G ₂ for ignition having high heat energy can be generated, it becomes possible to more reliably ignite the mixed gas of the propelling fuel and the oxidant.

FIGS. 2 and 3 show another embodiment of the ignition torch of the present invention. In the drawings, the parts designated by the same reference numerals as those in FIG. 1 represent the same parts.

In the present embodiment, a plurality of protrusions 30 are provided on the inner peripheral portion of the above-mentioned hollow structure oxidant supply pipe mounting seat 17 near the other end B side end.

These protrusions 30 are provided on the inner peripheral portion of the oxidant supply pipe mounting seat 17 at substantially equal intervals in the circumferential direction, and are formed between the respective tip portions and the spark generating portion 29 of the spark plug 27. A spark gap is formed.

Inside each of the protrusions 30, the fuel discharge port 1 that connects the main fuel chamber 18 and the spark generation chamber 23 is communicated.
9 is provided.

Further, the oxidant chamber 28 and the combustion gas flow path 2 for ignition are communicated with each other by the oxidant discharge port 31 which is a space formed between the respective projections 30. Oxidizing agent supply pipe mounting seat 1 including the discharge port 31
The amount of protrusion of the protrusion 30, that is, the size of the spark gap is determined in accordance with the flow rate of the oxidant flowing inside 7.

Although not shown in FIG. 2, the cooling fuel supply pipe 9, the main fuel supply pipe 15, and the oxidant supply pipe 21 are provided with orifices (flow rate adjustments) as in the above-described embodiment. Means) 10, 16, 22 (see FIG. 1) are provided, and the flow rate ratio of each is set to a similar value.

The operation of this embodiment will be described below.

The main fuel Fm is supplied to the main fuel supply pipe 15, and
The oxidant O is supplied to the oxidant supply pipe 2 and the cooling fuel Fc is supplied to the cooling fuel supply pipe 9.
And a spark spark is generated in the spark generation chamber 23 by the spark plug 27, the main fuel Fm flowing from the main fuel supply pipe 15 into the ignition combustion gas flow path 2 through the main fuel chamber 18 and the fuel discharge port 19. Then, the mixed gas of the oxidant O flowing from the oxidant supply pipe 21 through the oxidant chamber 28 and the spark generation chamber 23 into the ignition combustion gas flow path 2 is ignited and burned.

At this time, in this embodiment, since the plurality of protrusions 30 are provided so that a predetermined spark gap is formed with respect to the spark generating portion 29 of the spark plug 27, the oxidant discharge port 31 is provided. Even if a large amount of the oxidant O flows, the ignition performance due to the discharge spark generated in the spark generation part 29 does not deteriorate.

Further, the oxidant O contained in the combustion gas flow G ₁ of the mixed gas discharged from the combustion gas flow path 2 to the outside, and the cooling fuel Fc discharged from the cooling fuel flow path 7 to the outside. However, they react and burn efficiently as in the above-described embodiment.

As described above, in this embodiment, since the ignition performance of the discharge spark generated in the spark generating portion 29 of the spark plug 27 does not deteriorate, the reliability of the ignition torch can be further improved.

The ignition torch of the present invention is not limited to the above-described embodiment, but the cooling fuel F is used.
Cooling fuel flow path 7 for improving the ignitability of c
A member for applying a swirling force to the cooling fuel Fc flowing through the cooling fuel flow passage 7 is provided in the cooling fuel flow path 7, and the ignition torch is applied to the ignition means of equipment other than the two-liquid type propulsion device. It goes without saying that other various modifications can be made without departing from the scope of the present invention.

[0068]

As described above, according to the ignition torch of the present invention, various excellent effects as described below can be obtained.

(1) In any one of the ignition torches described in claims 1 to 4 of the present invention, the combustion fuel Fc is circulated in the cooling fuel flow path 7 to ignite the combustion gas flow path 2 for ignition. Since it is possible to effectively suppress the temperature rise of the torch inner cylinder 1 due to the combustion reaction of the main fuel Fm, the combustion gas flow G in the combustion gas flow passage 2 for ignition.
_{Even if 1} is continuously generated, erosion and the like due to heat load do not occur in the components of the ignition torch including the torch inner cylinder 1, and therefore the ignition torch operating time becomes long.

(2) In any one of the ignition torches described in claims 1 to 4 of the present invention, the ignition torch is discharged from the cooling fuel supply pipe 9 through the cooling fuel flow path 7 to the outside of the torch outer cylinder 3. This cooling fuel Fc is adjusted by appropriately adjusting the flow rate of the cooling fuel Fc.
It is possible to change the temperature of the combustion gas flow G ₂ for ignition generated by the reaction between the combustion gas flow G ₁ and the combustion gas flow G ₁ .

(3) In the ignition torch according to claims 2 to 4 of the present invention, the flow rate adjusting means 16 and 22 are provided.
As a result, the flow rate of the oxidant O supplied from the oxidant supply pipe 21 to the ignition combustion gas flow passage 2 is excessive with respect to the main fuel Fm supplied from the main fuel supply pipe 15 to the ignition combustion gas flow passage 2. Is set so that the temperature of the combustion gas flow G ₁ in the ignition combustion gas flow path 2 can be made relatively low, and the heat load acting on the components of the ignition torch including the torch inner cylinder 1 Can be further reduced.

(4) In the ignition torch described in claim 3 and claim 4 of the present invention, due to the flow passage cross-sectional shape of the cooling fuel flow passage 7, the torch outer cylinder 3 extends from the cooling fuel flow passage 7. Since the cooling fuel Fc discharged to the outside of the torch outer cylinder 3 is accelerated, the cooling fuel Fc discharged to the outside of the torch outer cylinder 3 from the cooling fuel flow path 7 and the torch inner cylinder 1 from the combustion gas flow path 2. A velocity difference is generated between the combustion gas flow G ₁ discharged to the outside, and the cooling fuel Fc and the combustion gas flow G ₁ are effectively mixed by this velocity difference, and the combustion gas flow G ₂ for ignition is changed. The combustion efficiency can be improved.

(5) In the ignition torch according to claim 4 of the present invention, a plurality of spark plugs are formed in the inner peripheral portion of the hollow member 17 so that a predetermined spark gap is formed with respect to the spark generating portion 29 of the spark plug 27. Since the protruding portion 30 of the spark generating portion 2 is provided, even if a large amount of the oxidant flows in the space 31,
The ignition performance due to the discharge spark generated in 9 does not deteriorate, and the reliability of the ignition torch can be further improved.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing an embodiment of an ignition torch of the present invention.

FIG. 2 is a sectional view schematically showing another embodiment of the ignition torch of the present invention.

FIG. 3 is a view taken along the line III-III in FIG.

[Explanation of symbols]

 1 Torch inner cylinder 2 Ignition combustion gas flow path 3 Torch outer cylinder 7 Cooling fuel flow path 9 Cooling fuel supply pipe 15 Main fuel supply pipe 16, 22 Orifice (flow rate adjusting means) 17 Oxidant supply pipe mounting seat (hollow) 21) Oxidant supply pipe 27 Spark plug 29 Spark generation part 30 Projection part 31 Oxidant discharge port (space)

Claims (4)

[Claims] 1. Inside from one end (A) side end to the other end (B)
A torch inner cylinder (1) having an ignition combustion gas flow path (2) extending to a side end, and an end (A) side end portion of the torch inner cylinder (1).
Outer cylinder which surrounds the inner torch cylinder (1) so that a cooling fuel flow path (7) is formed between the outer peripheral surface of the inner torch cylinder (1) and one end (A) side end of the torch inner cylinder (1). (3)
A main fuel supply pipe (15) and an oxidant supply pipe (21) communicating with a portion of the ignition combustion gas flow path (2) closer to one end (A) side, and the cooling fuel flow path ( 7) A fuel supply pipe (9) for cooling, which communicates with a portion near one end (A) side, and a spark plug (27) which generates a discharge spark toward a combustion gas flow passage (2) for ignition. Ignition torch characterized by becoming. 2. The main fuel supply pipe (15) is provided with a flow rate adjusting means (16) and the oxidant supply pipe (21) is provided with a flow rate adjusting means (22) so that the flow rate of the main fuel supply pipe (15) is The ignition torch according to claim 1, wherein the flow rate adjusting means (16) (22) is set so that the flow rate of the oxidant supply pipe (21) becomes excessive. 3. The cooling fuel flow passage (7) has a flow passage cross-sectional shape set so that the flow passage cross-sectional area is minimized in the vicinity of the other end (B) side end portion. Alternatively, the ignition torch according to claim 2. 4. One end (A) of an ignition combustion gas channel (2)
A hollow member (17) communicating with the ignition combustion gas flow channel (2) substantially coaxially is provided at a side end portion, and a spark generating portion (29) of a spark plug (27) is provided inside the hollow member (17). And a plurality of protrusions (30) projecting near the spark generating portion (29) of the spark plug (27) are provided on the inner peripheral portion of the hollow member (17). An oxidant supply pipe (21) is connected to the hollow member (17) so that the oxidant is supplied to the ignition combustion gas flow channel (2) through a space (31) formed therebetween. An ignition torch according to claim 1, 2 or 3.