Double-layer flame tube sparking plug floating sleeve mounting seat and combustion chamber

Abstract

The utility model discloses a double-layer flame tube sparking plug floating sleeve mounting seat and a combustion chamber, and belongs to the field of aero-engines. The double-layer flame tube sparking plug floating sleeve mounting seat comprises a diverging wall mounting seat, an impact wall mounting seat, a pressing plate and a floating sleeve, the diverging wall mounting seat and the impact wall mounting seat are respectively configured to be integrally formed parts, and a protruding adapter ring is formed on the face, facing the inner side of a flame tube, of the impact wall mounting seat. The adapter ring extends into the gap between the impact wall and the diverging wall, and the limiting flange on the peripheral side is matched with the limiting boss on the diverging wall mounting base to form axial limiting. The double-layer flame tube sparking plug floating sleeve mounting seat is simple in structure, convenient to assemble and capable of prolonging the service life and improving the reliability of a combustion chamber.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of aero-engine, concretely relates to a double-layer flame tube electric mouth floating cover mounting seat and combustion chamber. BACKGROUND

[0002] The aero-engine combustion chamber organizes combustion in the flame tube, and the flame tube structure needs to withstand the repeated action of high-temperature combustion gas. At present, some engines adopt a double-wall flame tube structure, with the outer layer as the impact wall and the inner layer as the dispersion wall, to improve the heat dissipation effect of the flame tube and improve the service life of the flame tube. Since the ignition electric mouth of the combustion chamber needs to pass through the outer ring wall of the flame tube and extend into the flame tube for ignition, the ignition electric mouth is fixed on the relatively low-temperature combustion chamber case, and the thermal deformation caused by the temperature difference and the combustion vibration of the flame tube require that the ignition electric mouth and the flame tube can have a small displacement to absorb the deformation and vibration.

[0003] Patent CN113124424A discloses an electric mouth mounting seat, which adopts a multi-layer connection structure to provide axial floating space for the electric mouth and isolate thermal deformation. However, the electric mouth mounting seat has many parts, complex assembly, high manufacturing cost, and the reliability of long-term service under high-temperature conditions needs to be improved. Therefore, it is of positive significance to provide a more simple and reliable electric mouth mounting seat to improve the service life of the aero-engine combustion chamber. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a double-layer flame tube electric mouth floating cover mounting seat to improve the reliability of the combustion chamber. The utility model also provides a combustion chamber.

[0005] According to an embodiment of the utility model, provide a kind of double-layer flame tube electric mouth floating sleeve mounting seat, the mounting seat is installed on flame tube, the double-layer flame tube electric mouth floating sleeve mounting seat includes divergent wall mounting seat, impact wall mounting seat, pressing plate and floating sleeve, the divergent wall mounting seat is fixedly connected to the divergent wall of the flame tube, the impact wall mounting seat is set on the outside of the impact wall of the flame tube, the surface of the impact wall towards the outside of the flame tube is provided with concave floating groove, the pressing plate is covered in the floating groove to form the limiting position to the floating sleeve, the floating sleeve is movably connected to the floating groove, the mounting hole for installing flame tube electric mouth is provided in the center of the floating sleeve, the divergent wall mounting seat, the impact wall mounting seat and the pressing plate are respectively provided with through hole matched with the mounting hole, to allow the flame tube electric mouth to pass through.Wherein, the divergent wall mounting seat and the impact wall mounting seat are respectively configured as integrally formed parts;One side of the impact wall mounting seat towards the inside of the flame tube is formed with the raised adapter ring, the adapter ring extends into the gap between the divergent wall and the impact wall of the flame tube, and a limiting flange is formed on the outer circumferential side of the adapter ring;One side of the divergent wall mounting seat towards the outside of the flame tube is formed with the raised limiting boss, and the limiting boss cooperates with the limiting flange to form axial limiting.

[0006] The double-layer flame tube electric mouth floating sleeve mounting seat has simple structure, simplifies assembly process, and is beneficial to improve the assembly efficiency of the flame tube;By setting the limiting flange and the limiting boss, the connecting position of the divergent wall mounting seat and the impact wall mounting seat is moved outward, so that it is away from the high-temperature area in the flame tube, and the assembly difficulty caused by the collapse of the divergent wall is reduced.

[0007] Further, in some embodiments, one side of the divergent wall mounting seat towards the inside of the flame tube is provided with a thermal barrier coating.

[0008] The thermal barrier coating can protect the divergent wall mounting seat from being damaged by the high-temperature combustion gas in the flame tube.

[0009] Further, in some embodiments, the divergent wall mounting seat is provided with a through cooling hole, which communicates the gap between the divergent wall and the impact wall in the flame tube.

[0010] The cooling hole helps to improve the cooling effect of the divergent wall mounting seat, reduce the temperature of the divergent wall in working state, and prolong the service life.

[0011] Further, in some embodiments, the adapter ring of the impact wall mounting seat is welded to the inner wall of the through hole of the divergent wall mounting seat.

[0012] Further, in some embodiments, the adapter ring is circumferentially provided with a plurality of plug welding grooves, and the adapter ring is connected to the inner wall of the through hole of the divergent wall mounting seat by multi-point plug welding, and the plug welding points are located in the plug welding grooves.

[0013] The plug welding instead of the whole circumferential brazing can effectively reduce the heat input in the welding process, reduce the thermal deformation of the adapter ring, thereby reducing the assembly difficulty and improving the service life of the flame tube.

[0014] Further, in some embodiments, the impact wall mounting seat is provided with a through hole.

[0015] Further, in some embodiments, the pressure plate is welded to the impact wall mounting seat.

[0016] Further, in some embodiments, the divergent wall mounting seat is in a welded connection with the divergent wall, and the weld joint is of an electron beam welding joint.

[0017] The electron beam welding can reduce the heat input and reduce the collapse risk of the divergent wall in the welding process.

[0018] According to an embodiment of the other aspect of the utility model, a combustion chamber is provided, comprising a flame tube and an electric nozzle, the flame tube comprises an electric nozzle floating sleeve mounting seat, and the electric nozzle is mounted on the electric nozzle floating sleeve mounting seat. Wherein, the flame tube comprises a divergent wall and an impact wall, and the electric nozzle floating sleeve mounting seat adopts the double-layer flame tube electric nozzle floating sleeve mounting seat provided in any one of the foregoing embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the double-layer flame tube electric nozzle floating sleeve mounting seat in an embodiment;

[0020] Figure 2 It is a structural schematic view of the mounting seat assembly in an embodiment;

[0021] Figure 3 It is an assembly schematic view of the double-layer flame tube electric nozzle floating sleeve mounting seat in an embodiment.

[0022] Meaning of reference signs:

[0023] 1-divergent wall mounting seat; 2-impact wall mounting seat; 3-pressure plate; 4-floating sleeve; 5-divergent wall; 6-inner surface of divergent wall mounting seat; 7-inner wall surface of divergent wall; 8-thermal barrier coating; 9-impact wall; 10-plug welding groove; 11-floating groove; 12-cooling hole; 13-cooling hole; 14-limiting flange; 15-limiting boss; 16-adapter ring.

[0024] The purpose of the above-mentioned drawings is to make a detailed description of the utility model, so that those skilled in the art can understand the technical concept of the utility model, and is not intended to limit the utility model. In order to express briefly, the above-mentioned drawings only schematically draw the structure related to the technical features of the utility model, and the complete structure and all details are not strictly drawn according to the actual proportion. DETAILED DESCRIPTION

[0025] The utility model will be further described below through specific embodiments combined with the drawings.

[0026] Reference to "embodiments" herein means that the specific features, structures or characteristics described in combination with the embodiments can be contained in at least one embodiment herein. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it limited to mutually exclusive or alternative embodiments. Those skilled in the art should understand that the embodiments herein can be combined with other embodiments without structural conflict.

[0027] In the description herein, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection" and the like should be understood broadly, for example, it can be movable connection, or fixed connection or integral. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0028] In the description herein, the terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "transverse", "vertical", "height", "length", "width" and the like are intended to accurately describe the embodiments and simplify the description, and are not limited to the parts or structures involved must have a specific orientation, be installed or operated in a specific orientation, and cannot be understood as a limitation on the embodiments herein.

[0029] In the description herein, the terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating relative importance or limiting the number, specific order or primary and secondary relationship of the described technical features. In the description herein, the meaning of "multiple" is at least two.

[0030] The aircraft engine will mix the high pressure gas after the action of the compressor with the fuel in the combustion chamber, and then burn violently to produce high temperature gas, and the high temperature gas will drive the compressor to rotate after the turbine expansion work. The combustion chamber is the area where the aircraft engine organizes combustion to produce energy, which is mainly composed of diffuser, fuel nozzle, flame tube and ignition electrode. And the ignition electrode is a device that provides ignition energy to the combustion chamber to ignite the mixture after the engine starts.

[0031] The combustion chamber organizes combustion in the flame tube, and the structure of the flame tube needs to withstand the repeated action of high-temperature gas. High temperature and cold deformation make the flame tube withstand harsh tests, so the material and process requirements of the flame tube are quite high, and its cooling design is also extremely important. At present, many engines use double-wall flame tube structure, the outer layer is impact wall, and the inner layer is divergent wall. Impact cooling holes are opened on the impact wall to impact cool the divergent wall. In addition, the inner wall of the divergent wall is often sprayed with thermal barrier coating for protection. The double-wall impact and divergent cooling structure design and the thermal barrier coating greatly improve the service life of the flame tube. However, the ignition electrode needs to pass through the outer ring wall of the flame tube to extend into the flame tube for ignition, and the ignition electrode is fixed on the relatively low-temperature combustion chamber case. There is a problem of deformation and incoordination between the two in the working state, and the flame tube combustion vibration also requires the ignition electrode to relatively absorb the small displacement of the flame tube, so as not to damage the ignition device due to the misalignment and vibration of the flame tube. Therefore, in order to solve the above problems, an electrode floating sleeve device needs to be arranged on the flame tube to absorb the deformation and vibration of the flame tube in all directions. The double-wall of the flame tube is a thin-wall structure, and the floating sleeve mounting seat is often fixed on the double-wall by welding. At this time, the welding method and structure between the floating sleeve mounting seat and the flame tube will affect the processing difficulty of the entire flame tube assembly.

[0032] The electrode floating sleeve mounting seat usually includes an impact wall mounting seat and a divergent wall mounting seat, as well as a floating sleeve and other structures, which need to be welded and fixed to form the entire floating sleeve mounting seat structure. The divergent wall mounting seat is welded on the divergent wall, which is flush with the inner wall of the divergent wall of the flame tube, and is also sprayed with a thermal barrier coating. In order to avoid affecting the installation of the double-wall, the divergent wall mounting seat is often not too high above the outer wall of the divergent wall, so the existing floating sleeve impact wall mounting seat needs to be lowered to the divergent wall for whole-circle welding to fix and connect. This method is easy to cause the coating to fall off due to the welding being too close to the inner wall of the divergent wall, thereby easily causing the risk of local overheating at the divergent wall mounting seat of the flame tube. In addition, the divergent wall mounting seat needs to be whole-circle welded on the divergent wall hole by argon arc welding, which has a wide heat-affected zone and high energy, often causing local collapse of the divergent wall. The length of the impact wall mounting seat extending into the divergent wall is limited by the gap between the double-walls. After local collapse, the lap amount of the impact wall mounting seat and the divergent wall mounting seat becomes small or even cannot lap, thereby failing to weld and connect the double-wall mounting seats.

[0033] Patent CN113124424A discloses an electrode mounting seat, which uses a multi-layer connection structure to provide axial floating space for the electrode, and uses a multi-layer axial structure to isolate thermal deformation. However, the electrode mounting seat uses many parts, has complex assembly, and has high manufacturing cost, which is not conducive to further improving the installation efficiency of the flame tube.

[0034] To solve the above problems, an embodiment of one aspect of the present application provides a double-layer flame tube electric nozzle floating sleeve mounting seat, which has a structure as shown in the figure. Figure 1 The double-layer flame tube electric nozzle floating sleeve mounting seat is mounted on the flame tube, the flame tube is provided in a double-layer structure, including a diverging wall 5 of an inner layer and an impact wall 9 of an outer layer, a gap is formed between the diverging wall 5 and the impact wall 9, and the inner side of the diverging wall 5 is a space where combustion occurs in the combustion chamber. The double-layer flame tube electric nozzle floating sleeve mounting seat includes a diverging wall mounting seat 1, an impact wall mounting seat 2, and a pressing plate 3. The diverging wall mounting seat 1 is fixedly connected to the diverging wall 5, the impact wall mounting seat 2 is arranged on the outer side of the impact wall 9, the surface of the impact wall mounting seat 2 towards the outside of the combustion cylinder is provided with a concave floating groove 11, the pressing plate 3 covers the floating groove 11 to limit the floating sleeve 4, the floating sleeve 4 is movably connected in the floating groove 11, the center of the floating sleeve 4 is provided with a mounting hole for mounting the flame tube electric nozzle, and correspondingly, the diverging wall mounting seat 1, the impact wall mounting seat 2, and the pressing plate 3 are also respectively provided with through holes matched with the mounting hole, so as to allow the flame tube electric nozzle (not shown) to pass through and extend from the outside of the flame tube to the inside of the flame tube.

[0035] Specifically, in combination with Figure 2 , the diverging wall mounting seat 1 and the impact wall mounting seat 2 are respectively configured as an integrally formed part. One side of the impact wall mounting seat 2 towards the inside of the flame tube is formed with a protruding adapter ring 16, the adapter ring 16 extends into the gap between the diverging wall 5 and the impact wall 9 of the flame tube, and a limiting flange 14 is formed on the circumferential outer side of the adapter ring 16. One side of the diverging wall mounting seat 1 towards the outside of the flame tube is formed with a protruding limiting boss 15, the limiting boss 15 cooperates with the limiting flange 14 to form axial limiting, so as to limit the axial displacement of the impact wall mounting seat 2 and prevent the impact wall mounting seat 2 from excessively displacing towards the inside of the flame tube.

[0036] In the preferred embodiment, the diverging wall inner wall surface 7 and the diverging wall mounting seat inner surface 6 are coated with a thermal barrier coating 8, so as to protect the diverging wall 5 and the diverging wall mounting seat 1 from being eroded by high-temperature combustion gas.

[0037] In the preferred embodiment, the diverging wall mounting seat 1 is provided with a penetrating cooling hole 12, the cooling hole 12 connects the inside of the flame tube with the gap between the diverging wall 5 and the impact wall 9, thereby playing a role of providing cooling for the diverging wall mounting seat 1.

[0038] In the preferred embodiment, the adapter ring 16 is fixedly connected to the inner wall of the through hole of the divergent wall mounting seat 1 by welding. In a further embodiment, the adapter ring 16 is circumferentially provided with a plurality of plug welding grooves 10, and the welding connection is achieved by multi-point plug welding in the plug welding grooves 10. The use of multi-point plug welding instead of full-circle vacuum brazing at the connection position of the divergent wall mounting seat 1 and the impact wall mounting seat 2 can avoid the overall heating of the flame tube into the furnace, prevent the thermal barrier coating 8 from falling off, and prevent the collapse of the divergent wall 5 of the flame tube from causing the mounting seat to be unable to be connected. Further, the multi-point plug welding in the plug welding grooves 10 of the adapter ring 16 can reduce the heat-affected zone and reduce the thermal deformation generated during welding.

[0039] In the preferred embodiment, the impact wall mounting seat 2 is provided with a through cooling hole 13, which can improve the cooling of the impact wall mounting seat 2.

[0040] In the preferred embodiment, the pressure plate 3 is welded to the impact wall mounting seat to prevent the floating sleeve 4 from coming out of the floating groove 11.

[0041] In the preferred embodiment, the divergent wall mounting seat 1 is connected to the divergent wall 5 by electron beam welding, which has a smaller heat-affected zone and can reduce the thermal deformation generated during welding and reduce the risk of thermal barrier coating 8 falling off.

[0042] The assembly method of the double-layer flame tube electrode nozzle floating sleeve mounting seat is as follows:

[0043] In combination Figure 3 , the divergent wall mounting seat 1 is first welded to the divergent wall 5 by electron beam welding process, and the thermal barrier coating 8 is sprayed on the inside of the flame tube, covering the divergent wall inner wall surface 7 of the divergent wall 5 and the inner surface 6 of the divergent wall mounting seat.

[0044] Next, the impact wall mounting seat 2 is installed from the outside of the impact wall 9 of the flame tube, the adapter ring 16 is inserted into the through hole in the center of the divergent wall mounting seat 1, and the limiting flange 14 on the outer circumferential side of the adapter ring 16 is matched with the limiting boss 15 of the divergent wall mounting seat 1. The limiting boss 15 can axially limit the impact wall mounting seat 2 to prevent the impact wall mounting seat 2 from being inserted too deeply. During assembly, the extension length of the floating sleeve 4 can also be adjusted according to the actual state to adapt to different flame tube collapse depths.

[0045] Next, the floating sleeve 4 is placed in the floating groove 11 of the impact wall mounting seat 2, and the pressure plate 3 is welded to the upper surface of the impact wall mounting seat 2 to limit the floating sleeve 4 and prevent it from coming out.

[0046] According to the embodiment of the utility model, the aero-engine combustion chamber is provided with the double-layer flame tube and the electric nozzle floating sleeve mounting seat, the electric nozzle is mounted in the electric nozzle floating sleeve mounting seat, the electric nozzle floating sleeve mounting seat is arranged on the inner side of the double-layer flame tube, the electric nozzle floating sleeve mounting seat is arranged on the outer side of the double-layer flame tube, and the electric nozzle floating sleeve mounting seat is arranged on the outer side of the double-layer flame tube.

[0047] The combustion chamber provided by the above embodiment can effectively reduce the risk of flame tube wall surface collapse and thermal barrier coating peeling caused by the welding heat affected zone in the electric nozzle floating sleeve mounting seat assembly process, improve the assembly efficiency, simplify the assembly process, and improve the overall reliability and service life of the combustion chamber.

[0048] The purpose of the above embodiment is to make a further detailed description of the utility model in combination with the drawings, so that those skilled in the art can understand the technical concept of the utility model. Within the scope disclosed by the utility model, the additional structures involved are optimized or equivalently replaced, and the implementation manners in different embodiments are combined without structural and principle conflicts, which all fall within the protection scope of the utility model.

Claims

1. A double-layer flame tube electrode nozzle floating sleeve mounting seat mounted on a flame tube, the double-layer flame tube electrode nozzle floating sleeve mounting seat comprising a divergence wall mounting seat, an impingement wall mounting seat, a pressing plate and a floating sleeve, the divergence wall mounting seat being fixedly connected to a divergence wall of the flame tube, the impingement wall mounting seat being arranged outside an impingement wall of the flame tube, a surface of the impingement wall towards an outside of the flame tube being provided with a concave floating groove, the pressing plate covering the floating groove to form a limit for the floating sleeve, the floating sleeve being movably connected to the floating groove, a center of the floating sleeve being provided with a mounting hole for mounting a flame tube electrode nozzle, the divergence wall mounting seat, the impingement wall mounting seat and the pressing plate being respectively provided with a through hole matched with the mounting hole to allow the flame tube electrode nozzle to pass through; characterized in that: the divergence wall mounting seat and the impingement wall mounting seat are respectively configured as an integrally formed part; a protruding adapter ring is formed on a side of the impingement wall mounting seat towards an inside of the flame tube, the adapter ring extending into a gap between the divergence wall and the impingement wall of the flame tube, a limit flange being formed on an outer circumferential side of the adapter ring; a protruding limit boss is formed on a side of the divergence wall mounting seat towards an outside of the flame tube, the limit boss cooperating with the limit flange to form axial limiting; a thermal barrier coating is arranged on a side of the divergence wall mounting seat towards the inside of the flame tube; the divergence wall mounting seat is provided with a cooling hole penetrating therethrough, the cooling hole communicating a gap between the divergence wall and the impingement wall inside the flame tube; the adapter ring of the impingement wall mounting seat is welded to an inner wall of the through hole of the divergence wall mounting seat; the adapter ring is circumferentially provided with a plurality of plug welding grooves, the adapter ring being connected to the inner wall of the through hole of the divergence wall mounting seat by multi-point plug welding, plug welding points being located in the plug welding grooves; the impingement wall mounting seat is provided with a through hole penetrating therethrough; the pressing plate is welded to the impingement wall mounting seat; the divergence wall mounting seat is welded to the divergence wall, a weld joint structure being an electron beam welding structure; the flame tube comprises a divergence wall and an impingement wall, and the electrode nozzle floating sleeve mounting seat adopts the double-layer flame tube electrode nozzle floating sleeve mounting seat according to any one of claims 1 to 8. ​ ​ ​ 2. The dual layer flame tube electrical nozzle float sleeve mounting seat of claim 1, wherein, ​ 3. The dual layer flame tube electrical nozzle float sleeve mounting seat of claim 1 or 2, wherein, ​ 4. The dual layer flame tube electrical nozzle float sleeve mounting seat of claim 1, wherein, ​ 5. The dual layer flame tube electrical nozzle float sleeve mounting seat of claim 4, wherein, ​ 6. The dual layer flame tube electrical nozzle float sleeve mounting seat of claim 1 or 4 or 5, wherein, ​ 7. The dual layer flame tube electrical nozzle float sleeve mounting seat of claim 1 or 4 or 5, wherein, ​ 8. The dual layer flame tube electrical nozzle float sleeve mounting seat of claim 1, wherein, ​ 9. A combustion chamber comprising a flame tube and an electrical nozzle, the flame tube comprising an electrical nozzle floating sleeve mount, the electrical nozzle mounted to the electrical nozzle floating sleeve mount, characterized in that, ​

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