Integrated stable and efficient ion flame detector for aero-engine

Abstract

The application relates to the technical field of aviation engine flame detection equipment, and particularly discloses an integrated stable and efficient aviation engine ion flame detector which comprises a shell, a mounting seat movably connected to the rear end of the shell, a central guide rod arranged in the shell, an insulation mechanism nested on the central guide rod, an inner detection electrode movably connected to one end of the central guide rod and extending out of the shell, an outer detection electrode nested on the outer part of the inner detection electrode and not in contact with the inner detection electrode, the outer detection electrode being buckled at one end with the end part of the shell and abutting against the end part of the insulation mechanism in the shell, and the surfaces of the inner detection electrode and the outer detection electrode being uniformly distributed with mesh holes for flame ion flow; a power socket is arranged on the upper part of the mounting seat, and the other end of the central guide rod extends into the mounting seat and is electrically connected with the power socket. The detection electrode is integrated, the current detection stability and efficiency are improved, the detection electrode is not affected by the installation position and distance between the detection electrodes, and the service life is long.

Description

Technical Field

[0001] This invention relates to the field of flame detection equipment technology for aero-engines, specifically to an integrated, stable, and efficient ion flame detector for aero-engines. Background Technology

[0002] The ion flame detector is one of the key components of the afterburner ignition system of an aero-engine. Its function is to sense the flame signal in the engine's afterburner and send the corresponding intensity of ion current signal to the signal control box to detect whether the afterburner has been successfully ignited.

[0003] An ionization flame detector is installed on the casing of the engine's afterburner. The probe of the flame detector extends into the flow channel of the afterburner. When afterburner ignition is successful, positive and negative ions are separated from the combustion oil and gas. The ion flow forms a loop between the positive and negative electrodes of the flame detector. When the loop current reaches a certain value, the signal controller transmits a flame control signal to the engine.

[0004] Currently, most traditional integrated ion flame detectors for aero engines use a single detection electrode, such as... Figure 1 As shown, when the engine ignites, the first detection electrode and the engine wall are ionized by the flame, and the current signal between them is collected by the signal controller. This method requires adjusting the relative position of the flame between the first detection electrode and the engine wall to ensure that the flame forms a circuit between them. This method is also greatly affected by the stability of the flame signal, easily causing problems such as inaccurate detection current and false alarms from the afterburner indicator. Besides the traditional integrated ion flame detector, there are also combined ion flame detectors with separate positive and negative electrodes. A second detection electrode is added to the engine wall and connected to it, forming a circuit between the flame ions and the first and second detection electrodes. The combined type increases the stability of the conduction circuit, but still requires adjusting the relative distance between the first and second detection electrodes and adding an installation position on the engine wall. Existing aero-engine ion flame detectors often use integrated stainless steel tubes for the first and second detection electrodes. These tubes have a short service life under the high temperature environment of the combustion chamber flame, and are prone to instability in the detection current signal due to flame signal instability. They are also easily affected by the installation position and distance between the detection electrodes, resulting in poor current detection stability, low efficiency, and high requirements for engine operation and maintenance. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an integrated, stable and efficient ion flame detector for aero-engines that is not affected by flame signals and has a long service life.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an integrated, stable, and efficient ion flame detector for aero-engines, comprising a housing, a mounting base movably connected to the rear end of the housing, a central guide rod disposed within the housing, an insulating mechanism nested on the central guide rod, an inner detection electrode extending out of the housing being movably connected to one end of the central guide rod, an outer detection electrode not in contact with the inner detection electrode being nested outside the inner detection electrode, one end of the outer detection electrode being fastened to the end of the housing and abutting against the end of the insulating mechanism within the housing, and mesh holes uniformly distributed on the surfaces of the inner and outer detection electrodes for the passage of flame ion flow; a power socket is disposed on the upper part of the mounting base, and the other end of the central guide rod extends into the mounting base and is electrically connected to the power socket.

[0007] The working principle of this technical solution is as follows: the outer detection electrode, mounting base, and housing are connected to the engine wall by bolts, forming an outer detection circuit; the inner detection electrode, central guide rod, and power socket form an inner detection circuit; a mesh structure between the outer detection electrodes creates a stable flame ion flow channel, guiding the flame flow to the inner detection electrode; the flame ions contact the inner detection electrode through the large mesh of the outer detection electrode, thus forming a stable conductive circuit. Because the inner detection electrode surface has mesh, the flame forms a stable ion flow in the middle channel, and some of the flame ion flow can flow back to the outer detection electrode through the mesh, enhancing the stability of the detection circuit connection after the flame is generated, efficiently acquiring the flame signal in the detection area, and the multiple meshes prevent localized overheating and thermal expansion cracking caused by the flame flow on the surfaces of the outer and inner detection electrodes.

[0008] To better realize the present invention, the mesh aperture of the inner detection electrode is further smaller than that of the outer detection electrode.

[0009] To better realize the present invention, the mesh aperture of the inner detection electrode is further half that of the mesh aperture of the outer detection electrode.

[0010] To better realize the present invention, the insulating mechanism further includes a ceramic tube placed inside the outer shell and an insulating component fixedly installed in the mounting base. A spring nested on the central guide rod is provided between the ceramic tube and the insulating component. One end of the ceramic tube abuts against the end of the external detection electrode, and the other end abuts against the spring. One end of the spring abuts against the ceramic tube, and the other end abuts against the insulating component. The central guide rod is fixed to the mounting base and the outer shell through the insulating component.

[0011] To better realize the present invention, a gasket is further provided between the spring and the ceramic tube, and between the spring and the insulating component.

[0012] To better realize the present invention, the mounting base is further provided with an openable rear cover on the side, the opening of which faces the central guide rod.

[0013] To better realize the present invention, the external detection electrode is further made of silicon carbide semiconductor material.

[0014] To better realize the present invention, the internal detection electrode is further made of high-temperature alloy steel.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] (1) The present invention integrates the detection electrodes together in a nested manner, which can avoid the problem of unstable detection current signal caused by unstable flame signal, and realize large-scale flame detection in combustion chamber. A stable flame ion circuit can be formed between the two, which improves the stability and efficiency of current detection.

[0017] (2) The present invention uses an outer detection electrode and an inner detection electrode with a differential mesh structure to detect the flame in the combustion chamber. It is not affected by the relative distance between the outer detection electrode and the inner detection electrode and the installation position, thus improving the assemblability of the product.

[0018] (3) By optimizing the materials of the external and internal detection electrodes, this invention can improve the service life of the ion flame detector, improve the reliability of the engine, reduce the number of maintenance times during the engine's lifespan, and reduce maintenance costs, making it suitable for widespread application. Attached Figure Description

[0019] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the structure of an existing aero-engine ion flame detector;

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 3 This is an enlarged cross-sectional view of a portion of the structure in this invention.

[0023] Wherein: 1—outer shell, 2—mounting base, 3—center guide rod, 4—inner detection electrode, 5—outer detection electrode, 6—power socket, 7—ceramic tube, 8—insulator, 9—spring, 10—washer, 11—back cover. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, the terms "first" and "second" are limited to descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly including one or more of the feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Example 1:

[0028] The main structure of this embodiment is as follows: Figure 2 As shown, the device includes a housing 1, with a mounting base 2 movably connected to the rear end of the housing 1. A central guide rod 3 is disposed inside the housing 1, and an insulating mechanism is nested on the central guide rod 3. An inner detection electrode 4 extending out of the housing 1 is movably connected to one end of the central guide rod 3. An outer detection electrode 5, which does not contact the inner detection electrode 4, is nested outside the inner detection electrode 4. One end of the outer detection electrode 5 is fastened to the end of the housing 1 and abuts against the end of the insulating mechanism inside the housing 1. Mesh holes for flame ion flow are evenly distributed on the surfaces of the inner detection electrode 4 and the outer detection electrode 5. A power socket 6 is disposed on the upper part of the mounting base 2, and the other end of the central guide rod 3 extends into the mounting base 2 and is electrically connected to the power socket 6.

[0029] In the specific implementation, the outer detection electrode 5, the mounting base 2 and the outer shell 1 are connected to the engine wall by bolts to form an outer detection circuit; the inner detection electrode 4, the central guide rod 3 and the power socket 6 form an inner detection circuit; the central conductor 3 is welded to the insulation mechanism by circumferential laser welding and connected to the inner detection electrode 4 by threads; the outer detection electrode 5 is fixed by pressing the ceramic tube 7 with a spring 9.

[0030] The ion flame generated by the aero-engine flows from the mesh on the surface of the outer detection electrode 5 to the inner detection electrode 4. The flame ions come into contact with the inner detection electrode 4 through the mesh of the outer detection electrode 5, and then flow back to the outer detection electrode 5 through the mesh of the inner detection electrode 4, thereby forming a stable conductive circuit, and thus realizing the detection process of the ion flame.

[0031] Example 2:

[0032] This embodiment, based on the above embodiments, further defines the mesh aperture relationship between the inner detection electrode 4 and the outer detection electrode 5, such as... Figure 3 As shown, the mesh size of the inner detection electrode 4 is smaller than that of the outer detection electrode 5. A stable flame ion flow channel is achieved between the outer detection electrodes 5 through a differential mesh structure. Large mesh openings are uniformly distributed on the surface of the outer detection electrode 5 in the flame detection area to guide the flame flow to the inner detection electrode 4. Small mesh openings are uniformly distributed on the surface of the inner detection electrode 4 in the flame detection area. Flame ions contact the inner detection electrode 4 through the large mesh openings of the outer detection electrode 5, thereby forming a stable conductive loop. Due to the small mesh size on the surface of the inner detection electrode 4, a stable ion flow is formed in the middle channel. Part of the ion flow can flow back to the outer detection electrode 4 through the small mesh openings, enhancing the stability of the detection loop connection after the flame is generated, efficiently acquiring the flame signal in the detection area, and preventing localized overheating and thermal expansion cracking caused by the flame flow on the surfaces of the outer detection electrode 5 and the inner detection electrode 4. Other parts of this embodiment are the same as those in the above embodiment and will not be repeated.

[0033] Example 3:

[0034] This embodiment, based on the above embodiments, further defines the mesh aperture relationship between the inner detection electrode 4 and the outer detection electrode 5, such as... Figure 3 As shown, the mesh size of the inner detection electrode 4 is half that of the outer detection electrode 5. Through practical testing, it is preferable that the mesh size of the inner detection electrode 4 is half that of the outer detection electrode 5. This allows flame ions to flow back to the outer detection electrode 3 through the smaller mesh when they come into contact with the inner detection electrode 4 via the larger mesh, thus forming a stable conductive circuit and preventing localized overheating. Other parts of this embodiment are the same as those in the previous embodiment and will not be repeated here.

[0035] Example 4:

[0036] This embodiment, based on the above embodiments, further defines the structure of the insulation mechanism, such as... Figure 2 As shown, the insulating mechanism includes a ceramic tube 7 placed inside the outer casing 1 and an insulating component 8 fixedly installed in the mounting base 2. A spring 9 nested on the central guide rod 3 is provided between the ceramic tube 7 and the insulating component 8. One end of the ceramic tube 7 abuts against the end of the external detection electrode 5, and the other end abuts against the spring 9; one end of the spring 9 abuts against the ceramic tube 7, and the other end abuts against the insulating component 8. The central guide rod 3 is fixed to the mounting base 2 and the outer casing 1 by the insulating component 8. The insulating component 8 is fixedly installed in the mounting base 2 and can be used to fix the central guide rod 3 inserted inside it. The spring 9 is used to press the ceramic tube 7 and the external detection electrode 5 together to achieve fixation. This insulating mechanism changes the contact between the insulating mechanism and the external detection electrode 5 from rigid abutment to elastic abutment, achieving a tight fixation of the external detection electrode 5 while ensuring insulation. The other parts of this embodiment are the same as those in the above embodiment and will not be described again.

[0037] Example 5:

[0038] This embodiment, based on the above embodiments, further defines the structure of the insulation mechanism, such as... Figure 2 As shown, gaskets 10 are also provided between the spring 9 and the ceramic tube 7, and between the spring 9 and the insulating component 8. The function of the gaskets 10 is to protect the ceramic tube 7 and the insulating component 8, preventing them from being damaged by direct contact with the spring 9. The other parts of this embodiment are the same as those in the above embodiment, and will not be described again.

[0039] Example 6:

[0040] This embodiment further defines the structure of the mounting base 2 based on the above embodiments, such as... Figure 2 As shown, the mounting base 2 is also provided with an openable rear cover 11 on its side, with the opening of the rear cover 11 facing the central guide rod 3. The rear cover 11 is mainly provided to facilitate the installation, disassembly, and maintenance of structures such as the insulating component 8 and the central guide rod 3 through the opening of the rear cover 11. Other parts of this embodiment are the same as those in the above embodiment and will not be described again.

[0041] Example 7:

[0042] This embodiment, based on the above embodiments, further specifies the material of the external detection electrode 5, which is silicon carbide semiconductor material. Using silicon carbide semiconductor material for the external detection electrode 5 improves the detector's tolerance to external temperature environments, enhances conductivity under high-temperature conditions in the afterburner, and significantly reduces the ablation of the internal detection electrode 4 by the engine flame. The external detection electrode 5 is manufactured from silicon carbide semiconductor material through processes such as cutting, grinding, and perforation. After the rear stepped surface contacts the outer shell 1 and the ceramic tube 7, it is fixed by a spring 3 to ensure good conductivity at the contact position of the external detection circuit. Other parts of this embodiment are the same as those in the above embodiments and will not be repeated.

[0043] Example 8:

[0044] This embodiment, based on the above embodiments, further specifies the material of the internal detection electrode 4 as high-temperature alloy steel. The internal detection electrode 4 is machined from high-temperature alloy steel and threadedly connected to the central guide rod 3, enhancing its service life under high-temperature impact. Other parts of this embodiment are the same as those in the above embodiments and will not be repeated.

[0045] It is understood that the working principle and process of components such as the power socket 6 and the spring 9 in the aircraft engine ion flame detector structure according to an embodiment of the present invention are prior art and well known to those skilled in the art, and will not be described in detail here.

[0046] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An integrated, stable, and efficient ion flame detector for aero-engines, characterized in that, The device includes a housing (1), a mounting base (2) movably connected to the rear end of the housing (1), a central guide rod (3) inside the housing (1), an insulating mechanism nested on the central guide rod (3), an inner detection electrode (4) extending out of the housing (1) movably connected to one end of the central guide rod (3), an outer detection electrode (5) not in contact with the inner detection electrode (4) nested outside the inner detection electrode (4), one end of the outer detection electrode (5) fastened to the end of the housing (1) and abutting against the end of the insulating mechanism inside the housing (1), and the inner detection electrode (4) and the outer detection electrode (5) have uniformly distributed mesh holes for flame ion flow to pass through on their surfaces; a power socket (6) is provided on the upper part of the mounting base (2), and the other end of the central guide rod (3) extends into the mounting base (2) and is electrically connected to the power socket (6).

2. The integrated, stable, and efficient ion flame detector for aero-engines according to claim 1, characterized in that, The mesh size of the inner detection electrode (4) is smaller than that of the outer detection electrode (5).

3. The integrated, stable, and efficient ion flame detector for aero-engines according to claim 2, characterized in that, The mesh size of the inner detection electrode (4) is half that of the mesh size of the outer detection electrode (5).

4. An integrated, stable, and efficient ion flame detector for aero-engines according to any one of claims 1 to 3, characterized in that, The insulation mechanism includes a ceramic tube (7) placed inside the outer shell (1) and an insulating component (8) fixedly installed in the mounting base (2). A spring (9) nested on the central guide rod (3) is provided between the ceramic tube (7) and the insulating component (8). One end of the ceramic tube (7) abuts against the end of the external detection electrode (5), and the other end abuts against the spring (9). One end of the spring (9) abuts against the ceramic tube (7), and the other end abuts against the insulating component (8). The central guide rod (3) is fixed inside the mounting base (2) and the outer shell (1) through the insulating component (8).

5. The integrated, stable, and efficient ion flame detector for aero-engines according to claim 4, characterized in that, Gaskets (10) are also provided between the spring (9) and the ceramic tube (7), and between the spring (9) and the insulating part (8).

6. An integrated, stable, and efficient ion flame detector for aero-engines according to any one of claims 1 to 3, characterized in that, The mounting base (2) is also provided with an openable back cover (11) on its side, and the opening of the back cover (11) faces the central guide rod (3).

7. An integrated, stable, and efficient ion flame detector for aero-engines according to any one of claims 1 to 3, characterized in that, The external detection electrode (5) is made of silicon carbide semiconductor material.

8. An integrated, stable, and efficient ion flame detector for aero-engines according to any one of claims 1 to 3, characterized in that, The internal detection electrode (4) is made of high-temperature alloy steel.

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