Turbofan engine ionization flame detector
By designing bullet-type probe tubes and designing floating sleeves on the outside of the through-pipe, the problems of tube ablation and through-pipe breakage of the turbofan engine ionization flame detector in high temperature and vibration environments are solved, and the reliability and service life of the product are improved.
Patent Information
- Application Number
- CN202411694938.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-03-11
AI Technical Summary
In high temperature and vibration environments, the probe tube is prone to ablation and breaking through the pipe, resulting in a shortened product life and low reliability.
Bullet-type probe tube is designed to smoothly transition the end of the probe tube to avoid tip ablation; a floating sleeve is designed on the outside of the pipe, which serves as an auxiliary support for the pipe to prevent excessive stress deformation of the pipe in the vibrating environment.
It effectively avoids the ablation of the probe tip and the breaking of the pipe, and improves the reliability and service life of the ionization flame detector.
Smart Images
Figure CN119595030A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of aviation turbofan engine ionization flame detection, in particular to a turbofan engine ionization flame detector. Background Art
[0002] Ionization flame detector is an important part of turbofan engine afterburner, used to detect the flame in afterburner and cooperate with electronic controller to send afterburner connection signal. Ionization flame detector is installed on afterburner cylinder of afterburner diffusion section. The probe tube is cantilever beam structure, and its end is in combustion chamber. Therefore, the probe tube is in high temperature and vibration working environment above 850℃ for a long time, which seriously affects the life of the product, and is manifested in probe tube ablation, through tube rupture, etc. Summary of the invention
[0003] Purpose of the invention: To provide a turbofan engine ionization flame detector to meet the high temperature and vibration characteristics of the turbofan engine afterburner. By designing a bullet-shaped probe tube, the end of the probe tube has a smooth transition to avoid tip ablation. By designing a floating sleeve on the outside of the through-tube, the floating sleeve plays an auxiliary supporting role for the through-tube, which can prevent the through-tube from generating excessive stress deformation in a vibration environment, and avoid the fracture problem caused by vibration stress deformation at the root of the through-tube, so as to improve the reliability and service life of the ionization flame detector.
[0004] Technical solution:
[0005] A turbofan engine ionization flame detector comprises: a junction box component 1, a through pipe 2, a sleeve 3, an insulating tube 4, a connecting sleeve 5, a probe tube 6, a floating sleeve 7, and a cover 8, wherein one end of the through pipe 2 is sleeved on the central electrode 1b of the junction box component 1 and fixed by welding; the insulating tube 4 and the sleeve 3 are sleeved on the outside of the connecting sleeve 5 in sequence, and the end face of one end of the sleeve 3 and the end face of one end of the connecting sleeve 5 are fixed by welding; one end of the sleeve 3 is inserted into the other end of the through pipe 2 and fixed by welding; one end of the probe tube 6 is inserted into the other end of the connecting sleeve 5 and fixed by welding; the other end of the probe tube 6 is a bullet-shaped structure, and a plurality of air outlet holes 6a are opened at the other end of the probe tube 6; the floating sleeve 7 is sleeved on the outside of the insulating tube 4, and the cover 8 is sleeved on the floating sleeve 7; the cover 8 is welded and fixed to the stabilizer 3-1; the junction box component 1 is screwed and connected to the booster cylinder 2-1 by threads.
[0006] Furthermore, the outer circle of the central electrode 1b of the junction box component 1 and the inner hole of the through tube 2 are interference fit at the connection, and the interference is 10-20μm; the welding method of the central electrode 1b of the junction box component 1 and the through tube 2 includes argon arc welding, laser welding or electron beam welding.
[0007] Furthermore, the sleeve 3 and the through pipe 2 are connected at an interference fit, and the interference is 10-20 μm; the sleeve 3 and the through pipe 2 can be welded by argon arc welding, laser welding or electron beam welding.
[0008] Furthermore, the connecting sleeve 5 and the insulating tube 4 are clearance-matched, and the clearance is 0.05-0.1 mm.
[0009] Further, the floating sleeve 7 has a barrel-shaped small end and an annular large end, and the cover 8 has an annular structure and an inner hole diameter greater than the outer diameter of the small end of the floating sleeve 7, so that the floating sleeve 7 can float radially in the cover 8, and the floating amount is 0-10mm; the outer side of the cover 8 is provided with a flange, which is welded and fixed to the stabilizer 3-1 by the flange, and the thickness of the outer flange of the cover 8 is greater than the thickness of the annular large end of the floating sleeve 7, so that the floating sleeve 7 can float axially in the cover 8. Further, the total cross-sectional area of the air outlet hole 6a of the probe 6 is 0.85-0.95 times the cross-sectional area of the air inlet hole 1a.
[0010] Furthermore, the air outlet hole 6 a is arranged on the leeward side of the probe tube 6 .
[0011] Furthermore, the air outlet holes 6a are arranged along the axis direction of the probe tube 6 and include three rows, one row of the air outlet holes 6a is opened along the wind direction, and the other two rows are symmetrically distributed on both sides.
[0012] Furthermore, the angle between the plane where the center line of the middle row of ventilation holes 6 a is located and the plane where the center line of any row of ventilation holes 6 a on both sides is located is 45°.
[0013] Furthermore, the material of the insulating tube 4 is any one of alumina ceramics, zirconium oxide ceramics and yttrium oxide ceramics.
[0014] Beneficial effects:
[0015] 1. The present invention designs a bullet-shaped probe tube with a smooth transition at the end of the probe tube, thereby avoiding the problem of ablation at the tip of the probe tube; by designing the ratio of the total cross-sectional area of the air outlet holes to the cross-sectional area of the air inlet holes to be 0.85 to 0.95 times, the cooling gas is compressed in the inner cavity of the probe tube, which can ensure that the cooling airflow adheres to all the inner walls of the probe tube and that the cooling gas passes through all the air outlet holes, thereby achieving the effect of cooling the probe tube.
[0016] 2. The present invention designs a floating sleeve on the outside of the through pipe, which plays an auxiliary supporting role for the through pipe, thereby preventing the through pipe from generating excessive stress deformation in a vibration environment, and avoiding the problem of fracture of the root of the through pipe due to vibration stress deformation; by controlling the radial and axial floating amounts of the floating sleeve, thermal deformation compensation of the stabilizer and the force-added cylinder in a high temperature environment can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of a cross-sectional embodiment of a turbofan engine ionization flame detector of the present invention.
[0018] Figure 2It is a schematic diagram of an axonometric embodiment of a junction box component of the present invention.
[0019] Figure 3 It is a schematic diagram of an axonometric embodiment of the through pipe of the present invention.
[0020] Figure 4 It is a schematic diagram of an axonometric embodiment of the sleeve of the present invention.
[0021] Figure 5 It is a schematic diagram of an axonometric embodiment of the insulating tube of the present invention.
[0022] Figure 6 It is a schematic diagram of an axonometric embodiment of the connecting sleeve of the present invention.
[0023] Figure 7 It is a schematic diagram of an axonometric embodiment of the probe tube of the present invention.
[0024] Figure 8 It is a schematic diagram of an axonometric embodiment of a floating sleeve of the present invention.
[0025] Fig. 9 It is a schematic diagram of an axonometric embodiment of the cover of the present invention.
[0026] Among them, 1 junction box component, 1a air inlet hole, 1b center electrode, 1c air outlet hole, 2 through pipe, 3 sleeve, 4 insulating tube, 5 connecting sleeve, 6 probe tube, 6a air outlet hole, 7 floating sleeve, 8 cover, 2-1 booster cylinder, 3-1 stabilizer. DETAILED DESCRIPTION
[0027] The present invention designs a bullet-shaped probe tube with a smooth transition at the end of the probe tube, thereby avoiding the problem of ablation at the tip of the probe tube; by designing the ratio of the total cross-sectional area of the outlet holes to the cross-sectional area of the inlet holes to be 0.85 to 0.95 times, the cooling gas is compressed in the inner cavity of the probe tube, which can ensure that the cooling gas flow is attached to all the inner walls of the probe tube and that all the outlet holes have cooling gas passing therethrough, thereby achieving the effect of cooling the probe tube; by designing a floating sleeve on the outside of the through tube, the floating sleeve plays an auxiliary supporting role for the through tube, thereby preventing the through tube from generating excessive stress deformation in a vibration environment, thereby avoiding the problem of fracture at the root of the through tube caused by vibration stress deformation; by controlling the radial and axial floating amount of the floating sleeve, thermal deformation compensation of the stabilizer and the booster cylinder in a high temperature environment can be achieved. The following is a detailed description in conjunction with the accompanying drawings.
[0028] Combined with Figures 1 to 9, a turbofan engine ionization flame detector, comprising: a junction box component 1, a through pipe 2, a sleeve 3, an insulating tube 4, a connecting sleeve 5, a probe tube 6, a floating sleeve 7, and a cover 8; one end of the through pipe 2 is sleeved on the central electrode 1b of the junction box component 1 and fixed by welding; the insulating tube 4 and the sleeve 3 are sleeved on the outside of the connecting sleeve 5 in sequence, and the end face of one end of the sleeve 3 and the end face of one end of the connecting sleeve 5 are fixed by welding; one end of the sleeve 3 is inserted into the other end of the through pipe 2 and fixed by welding; one end of the probe tube 6 is inserted into the other end of the connecting sleeve 5 and fixed by welding; the other end of the probe tube 6 is a bullet-shaped structure, and the other end of the probe tube 6 is provided with a plurality of air outlet holes 6a; the floating sleeve 7 is sleeved on the outside of the insulating tube 4, and the cover 8 is sleeved on the floating sleeve 7; the cover 8 is welded and fixed to the stabilizer 3-1; the junction box component 1 is screwed and connected to the booster cylinder 2-1 by threads;
[0029] The outer circle of the central electrode 1b of the junction box component 1 and the inner hole of the through pipe 2 are interference fit at the connection, and the interference is 10-20μm; the central electrode 1b and the through pipe 2 are welded and fixed, and the welding method includes argon arc welding, laser welding or electron beam welding.
[0030] The outer circle of the center electrode 1b forms a cylindrical structure support for the inner hole of the through tube 2 to prevent displacement deformation of the inner hole of the through tube 2 and the outer circle of the center electrode 1b under vibration stress, so as to improve the stress load resistance strength of the welding point between the center electrode 1b and the through tube 2.
[0031] The sleeve 3 and the through pipe 2 are connected at an interference fit, and the interference is 10-20 μm; the sleeve 3 and the through pipe 2 are fixed by welding, and the welding method includes argon arc welding, laser welding or electron beam welding.
[0032] The outer circle of the sleeve 3 forms a cylindrical structure support for the inner hole of the through pipe 2 to prevent displacement and deformation of the inner hole of the through pipe 2 and the outer circle of the sleeve 3 under vibration stress, so as to improve the stress load resistance strength of the welding point between the sleeve 3 and the through pipe 2.
[0033] The connection sleeve 5 and the insulating tube 4 are clearance-matched, and the clearance is 0.05-0.1 mm, so as to prevent the expansion of the connection sleeve 5 in a high temperature environment from causing the insulating tube 4 to burst.
[0034] The material of the insulating tube 4 is any one of alumina ceramics, zirconia ceramics, and yttria ceramics.
[0035] The floating sleeve 7 has a barrel-shaped small end and an annular large end, and the cover 8 is an annular structure with an inner hole diameter larger than the outer diameter of the small end of the floating sleeve 7, so that the floating sleeve 7 can float radially in the cover 8, and the floating amount is 0 to 10 mm.
[0036] The outer side of the cover 8 is provided with a flange, which is welded and fixed to the stabilizer 3 - 1 by the flange; the thickness of the flange on the outer side of the cover 8 is greater than the thickness of the large annular end of the floating sleeve 7, so that the floating sleeve 7 can float axially in the cover 8.
[0037] By controlling the radial and axial floating amounts of the floating sleeve, thermal deformation compensation of the stabilizer and the booster cylinder in a high temperature environment can be achieved.
[0038] The air outlet hole 6 a is provided on the leeward side of the probe tube 6 .
[0039] The air outlet holes 6a are arranged along the axis of the probe tube 6 and include three rows, one row of the air outlet holes 6a is opened along the wind direction, and the other two rows are symmetrically distributed on both sides.
[0040] The angle between the plane where the center line of the middle row of ventilation holes 6a is located and the plane where the center line of any row of ventilation holes 6a on both sides is located is 45°.
[0041] The air inlet hole 1a of the junction box component 1 is connected to the cooling air duct of the engine. After the cooling air flows into the air inlet hole 1a, it passes through the air outlet hole 1c, the inner hole of the through pipe 2, the inner hole of the connecting sleeve 5, the inner hole of the probe tube 6 in sequence, and finally flows out from the air outlet hole 6a of the probe tube 6.
[0042] The total cross-sectional area of the air outlet holes 6a of the probe tube 6 is 0.85 to 0.95 times the cross-sectional area of the air inlet holes. The cooling gas is compressed in the inner cavity of the probe tube 6, which can ensure that the cooling gas flow adheres to all the inner walls of the probe tube 6 and that cooling gas passes through all the air outlet holes 6a, thereby achieving the effect of cooling the probe tube 6.
[0043] Working principle:
[0044] 1. A floating sleeve 7 is designed on the outside of the through pipe 2. The floating sleeve 7 plays an auxiliary supporting role for the through pipe 2, which can prevent the through pipe 2 from generating excessive stress deformation under a vibration environment, and avoid the fracture problem caused by vibration stress deformation at the root of the through pipe 2; and by controlling the radial and axial floating amount of the floating sleeve 7, thermal deformation compensation of the stabilizer 3-1 and the booster cylinder 2-1 in a high temperature environment can be achieved;
[0045] 2. The probe tube 6 is designed as a bullet-shaped probe tube with a smooth transition at the end of the probe tube to avoid the problem of ablation at the tip of the probe tube; at the same time, the air inlet hole 1a of the junction box component 1 is connected to the cooling air duct of the engine. After the cooling air flows into the air inlet hole 1a, it passes through the air outlet hole 1c, the inner hole of the tube 2, the inner hole of the connecting sleeve 5, and the inner hole of the probe tube 6 in sequence, and finally flows out at the air outlet hole 6a of the probe tube 6. The total cross-sectional area of the air outlet holes 6a of the probe tube 6 is 0.85 to 0.95 times the cross-sectional area of the air inlet holes. The cooling air is compressed in the inner cavity of the probe tube 6, which can ensure that the cooling airflow adheres to all the inner walls of the probe tube 6 and that all the air outlet holes 6a have cooling gas passing through, so as to achieve a cooling effect on the probe tube 6.
Claims
1. A turbofan engine ionization flame detector, characterized in that: include: A junction box component (1), a through pipe (2), a sleeve (3), an insulating tube (4), a connecting sleeve (5), a probe tube (6), a floating sleeve (7), and a cover (8), wherein one end of the through pipe (2) is sleeved on the central electrode (1b) of the junction box component (1) and fixed by welding; the insulating tube (4) and the sleeve (3) are sleeved on the outside of the connecting sleeve (5) in sequence, and one end face of the sleeve (3) and one end face of the connecting sleeve (5) are fixed by welding; one end of the sleeve (3) is inserted into the through pipe (2) and fixed by welding; one end of the probe tube (6) is inserted into the other end of the connecting sleeve (5) and fixed by welding; the other end of the probe tube (6) is a bullet-shaped structure, and the other end of the probe tube (6) is provided with a plurality of air outlet holes (6a); the floating sleeve (7) is sleeved on the outside of the insulating tube (4), and the cover (8) is sleeved on the floating sleeve (7); the cover (8) is welded and fixed to the stabilizer (3-1); and the junction box component (1) is screwed and connected to the force cylinder (2-1) by means of threads.
2. The turbofan engine ionization flame detector according to claim 1, characterized in that: The outer circle of the central electrode (1b) of the junction box component (1) and the inner hole of the through pipe (2) are interference-fitted at the connection point, and the interference amount is 10 to 20 μm; the welding method of the central electrode (1b) of the junction box component (1) and the through pipe (2) includes argon arc welding, laser welding or electron beam welding.
3. The turbofan engine ionization flame detector according to claim 1, characterized in that: The sleeve (3) and the through pipe (2) are connected at an interference fit, with the interference being 10 to 20 μm. The sleeve (3) and the through pipe (2) are welded by argon arc welding, laser welding or electron beam welding.
4. The turbofan engine ionization flame detector according to claim 1, characterized in that: The connection sleeve (5) and the insulating tube (4) are clearance-matched, and the clearance is 0.05-0.1 mm.
5. The turbofan engine ionization flame detector according to claim 1, characterized in that: The floating sleeve (7) has a barrel-shaped small end and an annular large end, and the cover (8) has an annular structure and an inner hole diameter greater than the outer diameter of the small end of the floating sleeve (7), so that the floating sleeve (7) can float radially in the cover (8), and the floating amount is 0 to 10 mm; a flange is provided on the outer side of the cover (8), and is welded and fixed to the stabilizer (3-1), and the thickness of the flange on the outer side of the cover (8) is greater than the thickness of the annular large end of the floating sleeve (7), so that the floating sleeve (7) can float axially in the cover (8).
6. The turbofan engine ionization flame detector according to claim 1, characterized in that: The total cross-sectional area of the air outlet through hole (6a) of the probe tube (6) is 0.85 to 0.95 times the cross-sectional area of the air inlet through hole (1a).
7. The turbofan engine ionization flame detector according to claim 1, characterized in that: The air outlet hole (6a) is arranged on the leeward side of the probe tube (6).
8. The turbofan engine ionization flame detector according to claim 7, characterized in that: The air outlet holes (6a) are arranged along the axis of the probe tube (6) and include three rows, one row of the air outlet holes (6a) has its opening direction arranged along the wind direction, and the other two rows are symmetrically distributed on both sides.
9. The turbofan engine ionization flame detector according to claim 8, characterized in that: The included angle between the plane where the center line of the middle row of air-venting holes (6a) is located and the plane where the center line of any row of air-venting holes (6a) on both sides is located is 45°.
10. The turbofan engine ionization flame detector according to claim 1, characterized in that: The material of the insulating tube (4) is any one of alumina ceramics, zirconium oxide ceramics and yttrium oxide ceramics.