Ignition electrode tip device with retraction function

Abstract

The utility model discloses a kind of ignition electrode tip devices with retracting function, including shell and the center electrode tip assembly being set in the shell inside, the outside of the center electrode tip assembly is equipped with sleeve, sealing collar is arranged on the outer wall of the sleeve, the inner wall of the sealing collar and shell is closely slidingly fitted, to form airtight cavity in shell inside;Spring is arranged in the airtight cavity, the spring is equipped in the outside of sleeve, one end of the spring and the end surface of sealing collar abut, the other end of the spring and shell top abut;The utility model can effectively buffer the detonation impact force that electrode tip is received in the instant of ignition detonation, and make electrode tip retract away from high-temperature high-pressure environment during combustion process in combustion chamber, and then effectively prolong the service life of electrode tip.

Description

Technical Field

[0001] This utility model belongs to the technical field of ignition nozzles, specifically relating to an ignition nozzle device with a retraction function. Background Technology

[0002] The ignition electrode is a key component of the gas turbine ignition system. Its function is to convert the high-voltage electrical energy generated by the ignition device into an electric spark, igniting the fuel-air mixture in the combustion chamber to drive the gas turbine. In existing ignition electrode systems, the electrode structure extends directly into the combustion chamber of the gas turbine. Once the electrode structure ignites the combustion chamber, the high temperature and pressure generated by the deflagration of the combustible medium instantly impacts the ignition electrode, easily causing damage. Furthermore, the electrode structure of existing ignition electrode systems is exposed to the high temperature and pressure environment inside the combustion chamber for extended periods, accelerating erosion and severely reducing its service life.

[0003] Therefore, in response to the problem that the existing ignition nozzle structure cannot effectively resist the impact of deflagration and that its lifespan is reduced due to prolonged exposure to high temperature and high pressure, this utility model discloses an ignition nozzle device with a retraction function. Utility Model Content

[0004] This utility model discloses an ignition nozzle device with a retraction function, which can effectively buffer the deflagration impact force on the nozzle at the moment of ignition and deflagration, and retract the nozzle away from the high temperature and high pressure environment during combustion in the combustion chamber, thereby effectively extending the service life of the nozzle.

[0005] This utility model is achieved through the following technical solution:

[0006] An ignition nozzle device with a retraction function includes a housing and a central nozzle assembly disposed inside the housing. A sleeve is fitted around the outside of the central nozzle assembly, and a sealing ring is provided on the outer wall of the sleeve. The sealing ring slides tightly against the inner wall of the housing to form an airtight cavity inside the housing. A spring is disposed in the airtight cavity, and the spring is fitted around the outside of the sleeve. One end of the spring abuts against the end face of the sealing ring, and the other end of the spring abuts against the top of the housing. A balancing air port is provided on one side of the airtight cavity, and an exhaust assembly is installed at the balancing air port.

[0007] The working end of the central electric nozzle assembly extends from the opening at one end of the housing into the interior of the gas turbine combustion chamber. When not ignited, the sealing ring, under the force of a spring, causes the working end of the central electric nozzle assembly to extend from the opening at the end of the housing into the combustion chamber. After ignition inside the combustion chamber via the central electric nozzle assembly, the impact force of the combustion chamber's deflagration acts on the end of the sleeve, and this impact force is greater than the spring force. At this time, the spring compresses to buffer the impact force on the central electric nozzle assembly. Simultaneously, the spring compression causes the central electric nozzle assembly to retract into the housing, thus preventing the central electric nozzle assembly from directly contacting the high-temperature, high-pressure environment inside the combustion chamber, effectively extending the service life of the central electric nozzle assembly. During the upward movement of the sleeve and sealing ring, the air inside the airtight cavity is discharged through the exhaust assembly, thereby maintaining the balance and stability of the air pressure within the airtight cavity.

[0008] To better realize this utility model, a balancing air port is further provided on one side of the airtight cavity, and an exhaust assembly is installed at the balancing air port to balance the air pressure inside the airtight cavity.

[0009] To better realize this utility model, the exhaust assembly further includes an exhaust head, a composite filter, and a retaining ring. One end of the exhaust head is threadedly connected to a balance air port, and the other end of the exhaust head is provided with an outlet. The composite filter is press-fitted into the interior of the outlet through the retaining ring.

[0010] To better realize this utility model, the sealing ring further includes a first sealing body, a second sealing body, a mounting ring, and an elastic element. The mounting ring is integrally formed and disposed on the outside of the sleeve, and an annular groove is provided on the outer ring surface of the mounting ring. The first sealing body and the second sealing body are slidably disposed in the annular groove. The first end of the first sealing body and the first end of the second sealing body both extend to the outside of the annular groove and are tightly slidably connected to the inner wall of the outer shell. An elastic element is provided between the second end of the first sealing body and the inner wall of the annular groove.

[0011] To better realize this utility model, a first set of elastic elements is provided between the second end of the first sealing body and the inner wall of the annular groove, and a second set of elastic elements is provided between the second end of the second sealing body and the first sealing body.

[0012] To better realize this utility model, a first protrusion extending toward the second seal is provided on one side of the first seal, and a second protrusion extending toward the first seal is provided on one side of the second seal, forming a labyrinth tooth sealing structure between the first protrusion and the second protrusion.

[0013] To better realize this utility model, the central electrode assembly further includes a housing, a semiconductor, a central electrode, a contact head, and an electrode spring. The central electrode is coaxially mounted inside the housing. The first end of the central electrode extends to the outside of the housing and is provided with a semiconductor. The second end of the central electrode extends to the inside of the housing and is provided with a contact head. An insulating layer is provided on the outside of the central electrode, and an electrode spring is provided between the insulating layer and the inside of the housing.

[0014] To better realize this utility model, the insulating layer further includes a first insulator and a second insulator. The first insulator is sleeved on the outside of the first end of the central electrode, and the second insulator is sleeved on the outside of the second end of the central electrode. An electrode spring is provided between the first insulator and the second insulator.

[0015] To better realize this utility model, a mounting cavity is further formed between the inner wall of the first insulator and the outer wall of the central electrode, and a stainless steel anti-wave sleeve wrapped around the outside of the central electrode is provided inside the mounting cavity.

[0016] To better realize this utility model, one end of the outer shell is provided with an opening for the central electric nozzle assembly to extend out, and the end of the sleeve near the opening is provided with a pressure-bearing surface.

[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0018] This invention features a sleeve that slides inside the outer casing, with a central ignition nozzle assembly housed within the sleeve. A spring is positioned outside the sleeve, allowing the central ignition nozzle assembly to extend stably into the combustion chamber via the spring's elasticity, thus achieving stable ignition of the combustible medium within the combustion chamber. Furthermore, at the moment of ignition, the spring compression buffers the deflagration impact on the central ignition nozzle assembly, effectively preventing damage. Simultaneously, during combustion within the combustion chamber, the spring compression causes the sleeve and central ignition nozzle assembly to retract into the outer casing, distancing the central ignition nozzle assembly from the high-temperature, high-pressure environment inside the combustion chamber, effectively reducing erosion and significantly extending its service life. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the internal structure of the ignition nozzle device.

[0020] Figure 2 This is a schematic diagram of the central electric nozzle assembly;

[0021] Figure 3 This is a schematic diagram of the installation of the sealing ring sleeve;

[0022] Figure 4This is a schematic diagram of the exhaust assembly.

[0023] Figure 5 This is a schematic diagram of the sealing ring sleeve.

[0024] The components are as follows: 1. Central electric nozzle assembly; 2. Sleeve; 3. Spring; 4. Adapter seat; 5. Mounting seat; 6. Exhaust assembly; 7. Sealing ring; 8. Front housing; 9. Semiconductor; 10. Central electrode; 11. First insulator; 12. Contact head; 13. Electrode spring; 14. Rear housing; 15. Retaining ring; 16. Second insulator; 17. Stainless steel anti-surge sleeve; 18. Exhaust head; 19. Composite filter screen; 20. Retaining ring; 71. First seal; 72. Second seal; 73. Mounting ring; 711. First protrusion; 721. Second protrusion; 100. Airtight cavity; 200. Ring groove; 300. Mounting cavity. Detailed Implementation

[0025] Example 1:

[0026] 10. An ignition nozzle device with a retraction function according to this embodiment, such as... Figure 1 , Figure 3 As shown, the device includes a housing and a central electric nozzle assembly 1 disposed inside the housing. A sleeve 2 is fitted around the outside of the central electric nozzle assembly 1. A sealing ring 7 is provided on the outer wall of the sleeve 2. The sealing ring 7 is tightly slidably fitted against the inner wall of the housing to form an airtight cavity 100 inside the housing. A spring 3 is disposed in the airtight cavity 100. The spring 3 is fitted around the outside of the sleeve 2. One end of the spring 3 abuts against the end face of the sealing ring 7, and the other end of the spring 3 abuts against the top of the housing. A balance air port is provided on one side of the airtight cavity 100, and an exhaust assembly 6 is installed at the balance air port.

[0027] The housing includes an adapter 4 and a mounting base 5 coaxially connected. A sleeve 2 is coaxially slidably mounted inside the adapter 4 and mounting base 5. A central ignition nozzle assembly 1 is coaxially mounted inside the sleeve 2. The working end of the central ignition nozzle assembly 1 extends downwards to the outside of the adapter 4 and into the combustion chamber of the gas turbine. The receiving end of the central ignition nozzle assembly 1 extends upwards to the outside of the mounting base 5 and is connected to an external cable. In the non-ignition state, the sealing ring 7 outside the sleeve 2 is subjected to the downward force of the spring 3, which in turn causes the central ignition nozzle assembly 1 to extend out of the adapter 4. At this time, a high-energy, high-voltage electrical pulse can be applied to the central ignition nozzle assembly 1 through the cable, thereby initiating an electric arc at the working end of the central ignition nozzle assembly 1 and achieving ignition of the combustion chamber.

[0028] After ignition inside the combustion chamber, a high-temperature and high-pressure environment is created. At this time, the impact force on the bottom of the sleeve 2 is greater than the elastic force of the spring 3, which causes the sleeve 2 to move the central electric nozzle assembly 1 upward. Finally, the central electric nozzle assembly 1 retracts into the interior of the adapter 4, preventing the central electric nozzle assembly 1 from directly contacting the high-temperature and high-pressure environment inside the combustion chamber during combustion, thus effectively extending the service life of the central electric nozzle assembly 1. At the same time, at the moment when the central electric nozzle assembly 1 initiates arc ignition, the compression of the spring 3 buffers the impact force of the violent vibration inside the combustion chamber, preventing the central electric nozzle assembly 1 from being damaged by excessive impact force. During the upward movement of the sleeve 2 and the sealing ring 7, the air inside the airtight cavity 100 is discharged through the exhaust assembly 6, thereby maintaining the balance and stability of the air pressure in the airtight cavity 100.

[0029] Furthermore, such as Figure 4 As shown, the exhaust assembly 6 includes an exhaust head 18, a composite filter 19, and a retaining ring 20. One end of the exhaust head 18 is threadedly connected to a balance air port, and the other end of the exhaust head 18 has an outlet. The composite filter 19 is press-fitted into the outlet through the retaining ring 20. The composite filter 19 is composed of overlapping aluminum mesh and 304 stainless steel wire mesh, which is embedded in the outlet of the exhaust head 18. The retaining ring 20, the composite filter 19, and the exhaust head 18 are formed by stamping.

[0030] Furthermore, one end of the outer shell is provided with an opening for the central electric nozzle assembly 1 to extend out, and the end of the sleeve 2 near the opening is provided with a pressure-bearing surface, which is used to bear the pressure inside the combustion chamber and prevent the sleeve 2 from deforming.

[0031] Example 2:

[0032] This embodiment discloses an ignition nozzle device with a retraction function, which is an optimization based on Embodiment 1, such as... Figure 5 As shown, the sealing ring 7 includes a first sealing body 71, a second sealing body 72, a mounting ring 73, and an elastic element. The mounting ring 73 is integrally formed and disposed on the outside of the sleeve 2. An annular groove 200 is provided on the outer annular surface of the mounting ring 73. The first sealing body 71 and the second sealing body 72 are slidably disposed in the annular groove 200. The first end of the first sealing body 71 and the first end of the second sealing body 72 both extend to the outside of the annular groove 200 and are tightly slidably connected to the inner wall of the outer shell. An elastic element is provided between the second end of the first sealing body 71 and the inner wall of the annular groove 200.

[0033] Under the elastic force of the elastic element, the first sealing body 71 and the second sealing body 72 move toward the inner wall of the outer shell, thereby making the first end of the first sealing body 71 and the first end of the second sealing body 72 in close sliding contact with the inner wall of the outer shell, which ensures that the sleeve 2 can slide smoothly and also ensures the airtightness of the airtight cavity 100.

[0034] Furthermore, a first set of elastic elements is provided between the second end of the first sealing body 71 and the inner wall of the annular groove 200, and a second set of elastic elements is provided between the second end of the second sealing body 72 and the first sealing body 71. The first set of elastic elements provides elastic force to press the first sealing body 71 against the inner wall of the outer shell, and the second set of elastic elements provides elastic force to press the second sealing body 72 against the inner wall of the outer shell, thereby forming a multi-level, multi-layer annular sealing structure to ensure the airtightness of the airtight cavity 100.

[0035] Furthermore, a first protrusion 711 extending toward the second seal 72 is provided on one side of the first seal 71, and a second protrusion 721 extending toward the first seal 71 is provided on one side of the second seal 72, forming a labyrinth tooth sealing structure between the first protrusion 711 and the second protrusion 721.

[0036] The labyrinth tooth sealing structure formed by the interlocking of the first protrusion 711 and the second protrusion 721 further ensures the airtightness of the mating surface between the first seal 71 and the second seal 72.

[0037] The rest of this embodiment is the same as that of Embodiment 1, so it will not be described again.

[0038] Example 3:

[0039] This embodiment discloses an ignition nozzle device with a retraction function, which is an optimization based on embodiment 1 or 2, such as... Figure 2 As shown, the central electrode assembly 1 includes a housing, a semiconductor 9, a central electrode 10, a contact head 12, and an electrode spring 13. The central electrode 10 is coaxially mounted inside the housing. The first end of the central electrode 10 extends to the outside of the housing and is provided with the semiconductor 9. The second end of the central electrode 10 extends to the inside of the housing and is provided with the contact head 12. An insulating layer is provided on the outside of the central electrode 10, and an electrode spring 13 is provided between the insulating layer and the inside of the housing.

[0040] The housing includes a front housing 8 and a rear housing 14, which are welded together using electron beam welding. The first end of the central electrode 10 is the working end and is equipped with a semiconductor 9. The second end of the central electrode 10 is the receiving end and is equipped with a contact head 12, which is connected to an external cable. High-energy, high-voltage electrical pulses are input to the contact head 12 and the central electrode 10 via the external cable, thereby generating an electric arc at the working end of the central electrode 10 in conjunction with the semiconductor 9. This electric arc ignites the combustion medium inside the combustion chamber of the gas turbine. An insulating layer is provided on the outside of the central electrode 10 to ensure insulation between the central electrode and the housing. An electrode spring 13 is also provided to press the central electrode 10 towards the working end.

[0041] Furthermore, such as Figure 2 As shown, the insulating layer includes a first insulator 11 and a second insulator 16. The first insulator 11 is sleeved on the outside of the first end of the central electrode 10, and the second insulator 16 is sleeved on the outside of the second end of the central electrode 10. An electrode spring 13 is provided between the first insulator 11 and the second insulator 16. The outer surface of the first insulator 11 is slidably connected to the inner wall of the front housing 8, and the working end of the first insulator 11 is axially engaged with the semiconductor 9. The first insulator 11 and the semiconductor 9 are pressed and fixed by the elastic force applied towards the working end by the electrode spring 13.

[0042] Furthermore, the rear housing 14 has an opening at the end away from the front housing 8, and a retaining ring 15 is fitted inside the opening. The retaining ring 15 is used to axially press the second insulator 16.

[0043] Furthermore, an installation cavity 300 is formed between the inner wall of the first insulator 11 and the outer wall of the center electrode 10, and a stainless steel anti-wave sleeve 17 is provided inside the installation cavity 300 and is wrapped around the outside of the center electrode 10.

[0044] The rest of this embodiment is the same as that of embodiment 1 or 2, so it will not be described again.

[0045] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An ignition nozzle device with a retraction function, comprising a housing and a central nozzle assembly (1) disposed inside the housing, characterized in that, The central electric nozzle assembly (1) is fitted with a sleeve (2), and a sealing ring (7) is provided on the outer wall of the sleeve (2). The sealing ring (7) is tightly slidably fitted with the inner wall of the outer shell to form an airtight cavity (100) inside the outer shell. A spring (3) is provided in the airtight cavity (100). The spring (3) is fitted on the outside of the sleeve (2). One end of the spring (3) abuts against the end face of the sealing ring (7), and the other end of the spring (3) abuts against the top of the outer shell. A balance air port is provided on one side of the airtight cavity (100), and an exhaust assembly (6) is installed at the balance air port.

2. The ignition nozzle device with retraction function according to claim 1, characterized in that, The exhaust assembly (6) includes an exhaust head (18), a composite filter (19), and a retaining ring (20). One end of the exhaust head (18) is threadedly connected to the balance air port, and the other end of the exhaust head (18) is provided with an outlet. The composite filter (19) is press-fitted into the interior of the outlet through the retaining ring (20).

3. An ignition nozzle device with a retraction function according to claim 1 or 2, characterized in that, The sealing ring (7) includes a first sealing body (71), a second sealing body (72), a mounting ring (73), and an elastic element. The mounting ring (73) is integrally formed and disposed on the outside of the sleeve (2). An annular groove (200) is provided on the outer annular surface of the mounting ring (73). The first sealing body (71) and the second sealing body (72) are slidably disposed in the annular groove (200). The first end of the first sealing body (71) and the first end of the second sealing body (72) both extend to the outside of the annular groove (200) and are tightly slidably connected to the inner wall of the outer shell. An elastic element is provided between the second end of the first sealing body (71) and the inner wall of the annular groove (200).

4. The ignition nozzle device with retraction function according to claim 3, characterized in that, A first set of elastic elements is provided between the second end of the first sealing body (71) and the inner wall of the annular groove (200), and a second set of elastic elements is provided between the second end of the second sealing body (72) and the first sealing body (71).

5. The ignition nozzle device with retraction function according to claim 4, characterized in that, The first seal (71) has a first protrusion (711) extending toward the second seal (72) on one side, and the second seal (72) has a second protrusion (721) extending toward the first seal (71) on one side, and a labyrinth tooth sealing structure is formed between the first protrusion (711) and the second protrusion (721).

6. An ignition nozzle device with retraction function according to claim 1 or 2, characterized in that, The central electrode assembly (1) includes a housing, a semiconductor (9), a central electrode (10), a contact head (12), and an electrode spring (13). The central electrode (10) is coaxially mounted inside the housing. The first end of the central electrode (10) extends to the outside of the housing and is provided with the semiconductor (9). The second end of the central electrode (10) extends to the inside of the housing and is provided with the contact head (12). An insulating layer is provided on the outside of the central electrode (10), and an electrode spring (13) is provided between the insulating layer and the inside of the housing.

7. An ignition nozzle device with retraction function according to claim 6, characterized in that, The insulating layer includes a first insulator (11) and a second insulator (16). The first insulator (11) is sleeved on the outside of the first end of the center electrode (10), and the second insulator (16) is sleeved on the outside of the second end of the center electrode (10). An electrode spring (13) is provided between the first insulator (11) and the second insulator (16).

8. The ignition nozzle device with retraction function according to claim 7, characterized in that, An installation cavity (300) is formed between the inner wall of the first insulator (11) and the outer wall of the center electrode (10), and a stainless steel anti-surge sleeve (17) is provided inside the installation cavity (300) and is wrapped around the outside of the center electrode (10).

9. An ignition nozzle device with a retraction function according to claim 1 or 2, characterized in that, One end of the outer shell is provided with an opening for the central electric nozzle assembly (1) to extend out, and the end of the sleeve (2) near the opening is provided with a pressure-bearing surface.

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