CN220059733U

CN220059733U - Ignition needle structure

Info

Publication number: CN220059733U
Application number: CN202321450240.2U
Authority: CN
Inventors: 杨瑞; 曹晶; 王俊
Original assignee: Wisdom Energy Technology Co Ltd
Current assignee: Wisdom Energy Technology Co Ltd
Priority date: 2023-06-07
Filing date: 2023-06-07
Publication date: 2023-11-21
Anticipated expiration: 2033-06-07

Abstract

The utility model provides an ignition needle structure which is used for igniting a device to be ignited and comprises an ignition needle main body and an outer sleeve sleeved outside the ignition needle main body, wherein a gap is formed between the outer sleeve and the ignition needle main body, a first cavity communicated with the gap is formed between the front end of the outer sleeve and the front end of the ignition needle main body, a second cavity communicated with the first cavity is formed at the front end of the ignition needle main body, a first hole communicated with the gap and the outside is formed in the outer sleeve, and a second hole communicated with the gap is formed in the side wall of the second cavity.

Description

Ignition needle structure

Technical Field

The utility model relates to the technical field of ignition devices, in particular to an ignition needle structure.

Background

The gas turbine is a machine which takes continuously flowing gas as working medium to drive an impeller to rotate at high speed so as to convert the energy of fuel into useful work. This transition is mainly accomplished by combustion of the fuel in the combustion chamber, so that successful ignition is an indicator of gas turbine start-up. Igniters are commonly employed in gas turbines to create ignition sources to ignite the fuel entering the combustion chamber, and thus, the performance of the igniters is important to the gas turbine. The existing ignition needle adopts high-voltage power to break down air, then an electric arc is generated, a gas turbine and the like use the electric arc to ignite a combustion chamber, and the arc generating end face of the ignition needle structure is easy to generate carbon deposition or fuel coking due to the fact that the vicinity of the ignition needle is rich in oil and burns during ignition, so that the ignition needle cannot generate the electric arc or the electric arc is unstable, further the ignition needle fails, and the ignition failure rate is increased.

Disclosure of Invention

In view of the above, the present utility model provides an ignition needle structure that can effectively solve the above-mentioned problems.

In an embodiment, the ignition needle body comprises an ignition needle electrode, an ignition needle ceramic tube sleeved outside the ignition needle electrode and an ignition needle shell sleeved outside the ignition needle ceramic tube, the gap is formed between the outer peripheral surface of the ignition needle shell and the inner peripheral surface of the outer sleeve, the first cavity is formed between the front end of the outer sleeve and the front end of the ignition needle shell, the second cavity is formed between the front end of the ignition needle ceramic tube and the front end of the ignition needle shell, and the second hole is formed on the side wall of the ignition needle shell corresponding to the second cavity.

In one embodiment, the first aperture is spaced from the front end of the outer sleeve a greater distance than the second aperture is spaced from the front end of the outer sleeve.

In an embodiment, the front end of the ignition needle electrode protrudes out of the front end of the ignition needle ceramic tube, and the distance from the front end surface of the ignition needle electrode to the front end inner surface of the ignition needle housing is smaller than the distance from the outer Zhou Mianju of the ignition needle electrode to the inner circumferential surface of the ignition needle housing.

In an embodiment, a first through hole is formed in the front end wall of the outer sleeve, a second through hole is formed in the front end wall of the ignition needle housing, and a high-voltage arc generated between the ignition needle housing and the ignition needle electrode extends to the outside through the second through hole and the first through hole.

In one embodiment, the first hole is disposed obliquely toward the front end of the jacket.

In one embodiment, the second hole is disposed obliquely toward the front end of the ignition needle housing; or the second hole is disposed toward a high-voltage arc generating end formed between the ignition needle housing and the ignition needle electrode.

In an embodiment, a first butt joint part is formed on the side wall of the ignition needle casing, a second butt joint part is formed at the rear end of the outer sleeve, the first butt joint part is fixedly connected with the second butt joint part, and a sealing gasket is arranged between the first butt joint part and the second butt joint part.

In an embodiment, the ignition needle structure further comprises a fixing seat, and the fixing seat is fixedly connected to the rear end of the ignition needle shell.

In one embodiment, the device to be ignited is a gas turbine, and the front end of the ignition needle structure extends into the combustion chamber of the gas turbine to ignite the gas turbine.

In summary, the ignition needle structure provided by the utility model has at least the following beneficial effects: a gap is formed between the outer sleeve and the ignition needle body, and an arc generated by the ignition needle body extends from the front end of the ignition needle body to the outside through the front end of the outer sleeve to ignite the device to be ignited, i.e., the arc sequentially passes through the second cavity and the first cavity to the outside. The gap is used for guiding a part of compressed air entering from the outside through the first hole into the first cavity so as to elongate the electric arc, improve the ignition success rate, the other part of compressed air enters the second cavity through the second hole so as to elongate the electric arc further, further improve the ignition success rate, and meanwhile, the air flow entering the second cavity can blow fuel away from the high-voltage arc generating end, so that the phenomena of carbon deposition, fuel coking and the like at the high-voltage arc generating end are effectively prevented, and the service life of the ignition needle structure is prolonged.

Drawings

Fig. 1 is a schematic perspective view of an exemplary ignition needle structure of the present utility model in one direction.

Fig. 2 is a schematic perspective view of the ignition needle structure in fig. 1 in another direction.

Fig. 3 is a cross-sectional view of the structure of the ignition needle of fig. 1.

Fig. 4 is an exploded view of the structure of the ignition needle of fig. 1.

Detailed Description

Before the embodiments are explained in detail, it is to be understood that the utility model is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the drawings. The utility model is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of the terms "comprising," "including," "having," and the like are intended to encompass the items listed thereafter and equivalents thereof as well as additional items. In particular, when "a certain element" is described, the present utility model is not limited to the number of the element as one, but may include a plurality of the elements.

As shown in fig. 1-4, the present utility model provides an ignition needle structure 10, where the ignition needle structure 10 may be used to ignite a device to be ignited, such as a gas turbine, an aeroengine, a boiler, a natural gas flare, etc., and in this embodiment, the gas turbine is described as an example, for example, a high voltage arc is generated at the front end of the ignition needle structure 10, that is, the front end of the ignition needle structure 10 is the ignition end, and the front end of the ignition needle structure 10 extends into the combustion chamber of the gas turbine to ignite the gas turbine.

The ignition needle structure 10 comprises an ignition needle body and an outer sleeve 12 sleeved outside the ignition needle body, wherein a gap 14 is formed between the outer sleeve 12 and the ignition needle body, and the gap 14 extends along the circumferential direction and is annular. A first cavity 16 communicating with the gap 14 is formed between the front end of the outer sleeve 12 and the front end of the ignition needle body, a second cavity 18 communicating with the first cavity 16 is formed at the front end of the ignition needle body, a first hole 20 communicating with the gap 14 and the outside is formed on the outer sleeve 12, and a second hole 22 communicating with the gap 14 is formed on the side wall of the second cavity 18. So designed, the arc generated by the needle body extends from the front end of the needle body to the outside through the front end of the outer sleeve 12 to ignite the gas turbine, i.e., the arc sequentially extends to the outside through the second chamber 18 and the first chamber 16. The gap 14 is used for guiding a part of compressed air entering from the outside through the first hole 20 into the first cavity 16 so as to elongate an electric arc and improve the ignition success rate, and the other part of compressed air enters the second cavity 18 through the second hole 22 so as to elongate the electric arc further and improve the ignition success rate, and meanwhile, the air flow entering the second cavity 18 can blow fuel away from the high-voltage arc generating end, so that phenomena of carbon deposition, fuel coking and the like at the high-voltage arc generating end are effectively prevented, and the service life of the ignition needle structure 10 is prolonged.

In the illustrated embodiment, the ignition needle structure 10 is generally cylindrical, the ignition needle structure 10 has a central axis, and the ignition needle structure 10 has axially opposite front and rear ends a and B, respectively, each element of the ignition needle structure 10 being referenced to a direction defined by the front and rear ends a and B.

More specifically, the ignition needle body includes an ignition needle electrode 24, an ignition needle ceramic tube 26 sleeved outside the ignition needle electrode 24, and an ignition needle housing 28 sleeved outside the ignition needle ceramic tube 26, for example, the ignition needle electrode 24 is located on a central axis of the ignition needle structure 10, the ignition needle ceramic tube 26, the ignition needle housing 28, and the outer sleeve 12 are sequentially arranged around the central axis around the ignition needle electrode 24, and the ignition needle electrode 24 and the ignition needle ceramic tube 26, and the ignition needle ceramic tube 26 and the ignition needle housing 28 are tightly connected, for example, in an interference fit, by screwing, or the like. The gap 14 is formed between the outer peripheral surface of the needle housing 28 and the inner peripheral surface of the jacket 12, i.e., in the region of the gap 14, the inner diameter of the jacket 12 is greater than the outer diameter of the needle housing 28. The first cavity 16 is formed between the front end of the outer sleeve 12 and the front end of the needle housing 28, the second cavity 18 is formed between the front end of the needle ceramic tube 26 and the front end of the needle housing 28, and the second hole 22 is provided in the side wall of the needle housing 28 corresponding to the second cavity 18.

In the illustrated embodiment, a plurality of, e.g., four, first apertures 20 are provided, the plurality of first apertures 20 being evenly spaced along the circumference of the jacket 12; the second holes 22 are also provided in plural, for example, four, and the plurality of second holes 22 are provided at regular intervals in the circumferential direction of the ignition needle housing 28. And, the plurality of first holes 20 and the plurality of second holes 22 are arranged in a staggered manner.

Further, the first aperture 20 is spaced from the front end of the sleeve 12 by a greater distance than the second aperture 22 is spaced from the front end of the sleeve 12, i.e., the second aperture 22 is located between the first aperture 22 and the front end of the sleeve 12.

Air is broken down by the high voltage power between the needle housing 28 and the needle electrode 24, thereby creating an arc, and thus, a high voltage arc generating end is formed between the needle housing 28 and the needle electrode 24, i.e., the high voltage arc generating end is located within the second chamber 18. The front end of the ignition needle electrode 24 protrudes beyond the front end of the ignition needle ceramic tube 26, and the distance from the front end surface of the ignition needle electrode 24 to the front end inner surface of the ignition needle housing 28 is smaller than the distance from the outer peripheral surface of the ignition needle electrode 24 to the inner peripheral surface of the ignition needle housing 28, so that the compressed air entering the second chamber 18 from the second hole 22 can blow off the fuel at the high-voltage arc generating end. Specifically, the front end of the ignition needle electrode 24 is located within the second cavity 18, i.e., the front end of the ignition needle electrode 24 is located between the front end face of the ignition needle ceramic tube 26 and the front end of the ignition needle housing 28. Optionally, the front end of the ignition needle electrode 24 is flush with the second through hole 32 of the ignition needle housing 28. Preferably, the front end of the ignition needle electrode 24 is substantially flush with the second hole 22, so that the compressed air entering from the second hole 22 can be directly blown to the fuel at the high-voltage arc generating end, thereby improving the effect of blowing off the fuel from the high-voltage arc generating end.

Preferably, the first holes 20 are inclined toward the front end of the outer jacket 12 so that the external compressed air can more smoothly flow to the first and second cavities 16 and 22 after entering the gap 14 from the first holes 20, thereby improving the arc elongation effect; the second hole 22 is inclined toward the front end of the ignition needle housing 28 so that the compressed air in the gap 14 can smoothly flow into the second cavity 18, thereby improving the arc elongation effect; or the second bore 22 is disposed toward the high voltage arc generating end formed between the needle housing 28 and the needle electrode 24 such that air flow from the second bore 22 into the second chamber 18 flows directly toward the high voltage arc generating end, enhancing the effect of blowing fuel away from the high voltage arc generating end.

The front end wall of the outer sleeve 12 is provided with a first through hole 30, the front end wall of the ignition needle housing 28 is provided with a second through hole 32, and a high-voltage arc generated between the ignition needle housing 28 and the ignition needle electrode 24 sequentially extends to the outside through the second through hole 32 and the first through hole 30.

In the illustrated embodiment, the needle ceramic tube 26, the needle housing 28, and the outer sleeve 12 are all of an axial through configuration, with the needle electrode 24 having a T-shaped configuration. The side wall of the ignition needle housing 28 extends outwards to form a first butt joint part 34, the rear end of the outer sleeve 12 extends outwards to form a second butt joint part 36, the first butt joint part 34 is fixedly connected with the second butt joint part 36, for example, screw holes are respectively formed in the first butt joint part 34 and the second butt joint part 36 and are fixed by screws, and then the outer sleeve 12 is fixedly connected with the ignition needle body. Preferably, a sealing gasket 38 is provided between the first and second abutments 34 and 36 to seal the end of the gap 14 remote from the forward end. The rear end of the ceramic tube 26 of the ignition needle expands and forms a cavity, and the bottom expanded portion of the ignition needle electrode 24 is located within the cavity and against the end wall of the cavity.

In the illustrated embodiment, the ignition needle structure 10 further includes a fixing base 40, the fixing base 40 being fixedly connected to the outside of the rear end side wall of the ignition needle housing 28. The fixing base 40 is, for example, a six-sided nut, and the six-sided nut is connected to the outer surface of the rear end sidewall of the ignition needle housing 28 by a screw connection.

Optionally, a spacer 42 is also provided on the front end face of the second docking portion 36 to facilitate mounting connection of the ignition needle structure 10 to the combustor side wall of the gas turbine.

The concepts described herein may be embodied in other forms without departing from the spirit or characteristics thereof. The particular embodiments disclosed are illustrative and not restrictive. The scope of the utility model is, therefore, indicated by the appended claims rather than by the foregoing description. Any changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. The utility model provides an ignition needle structure for a device that ignites, its characterized in that includes ignition needle main part and cover are located the overcoat in ignition needle main part outside, the overcoat with form the clearance between the ignition needle main part, the overcoat the front end with form between the front end of ignition needle main part with the first chamber of clearance intercommunication, just the front end of ignition needle main part be formed with the second chamber of first chamber intercommunication, be equipped with the intercommunication on the overcoat the first hole of clearance and outside, be equipped with on the lateral wall of second chamber with the second hole of clearance intercommunication.

2. The ignition needle structure according to claim 1, wherein the ignition needle main body comprises an ignition needle electrode, an ignition needle ceramic tube sleeved outside the ignition needle electrode, and an ignition needle housing sleeved outside the ignition needle ceramic tube, the gap is formed between an outer peripheral surface of the ignition needle housing and an inner peripheral surface of the outer sleeve, the first cavity is formed between a front end of the outer sleeve and a front end of the ignition needle housing, the second cavity is formed between a front end of the ignition needle ceramic tube and a front end of the ignition needle housing, and the second hole is formed on a side wall of the ignition needle housing corresponding to the second cavity.

3. The ignition needle structure of claim 2, wherein a spacing distance between said first aperture and a forward end of said outer sleeve is greater than a spacing distance between said second aperture and a forward end of said outer sleeve.

4. The ignition needle structure according to claim 2, wherein the front end of the ignition needle electrode protrudes outside the front end of the ignition needle ceramic tube, and the front end face of the ignition needle electrode is spaced from the front end inner surface of the ignition needle housing by a distance smaller than the distance of the outer Zhou Mianju of the ignition needle electrode to the inner peripheral surface of the ignition needle housing.

5. The ignition needle structure according to claim 2, wherein a first through hole is provided in a front end wall of the outer sheath, a second through hole is provided in a front end wall of the ignition needle housing, and a high-voltage arc generated between the ignition needle housing and the ignition needle electrode extends to the outside through the second through hole and the first through hole.

6. The ignition needle structure of claim 1, wherein said first aperture is disposed obliquely toward a front end of said outer sleeve.

7. The ignition needle structure of claim 2, wherein said second aperture is disposed obliquely toward a front end of said ignition needle housing; or the second hole is disposed toward a high-voltage arc generating end formed between the ignition needle housing and the ignition needle electrode.

8. The ignition needle structure of claim 2, wherein a first butt joint part is formed on a side wall of the ignition needle housing, a second butt joint part is formed at a rear end of the outer sleeve, the first butt joint part is fixedly connected with the second butt joint part, and a sealing gasket is arranged between the first butt joint part and the second butt joint part.

9. The ignition needle structure of claim 2, further comprising a mounting fixedly attached to the rear end of the ignition needle housing.

10. The ignition needle structure of any one of claims 1-9, wherein the device to be ignited is a gas turbine, and a front end of the ignition needle structure extends into a combustion chamber of the gas turbine to ignite the same.