Turbine force-bearing casing sealing heat insulation runner structure

Abstract

The application provides a turbine force-bearing casing sealing and heat-insulating flow channel structure, which comprises an outer flow channel ring, an outer flow channel plate, an outer flow channel ring mounting edge and a flexible ring. The front side of the outer flow channel ring is mounted on an outer layer connecting casing through the outer flow channel ring mounting edge, and the rear side of the outer flow channel ring is connected with a plurality of circumferentially distributed outer flow channel plates through a connecting assembly, so as to form an outer flow channel assembly. The flexible ring is arranged between the outer flow channel ring and the outer flow channel ring mounting edge. The application further provides an inner flow channel ring and an inner flow channel plate. The front side of the inner flow channel ring is mounted on an inner sealing ring, and the rear side of the inner flow channel ring is connected with a plurality of circumferentially distributed inner flow channel plates through a connecting assembly, so as to form an inner flow channel assembly. A support plate basin side heat-insulating cover and a support plate back side heat-insulating cover are arranged between the outer flow channel assembly and the inner flow channel assembly. The support plate basin side heat-insulating cover and the support plate back side heat-insulating cover wrap a force-bearing casing support plate and are connected with the outer flow channel plate and the inner flow channel plate through connecting assemblies, so as to form a support plate heat-insulating cover assembly.

Description

Technical Field

[0001] This application belongs to the field of aero-engines, and specifically relates to a turbine bearing casing sealing and heat insulation flow channel structure. Background Technology

[0002] The inner ring, outer ring, and connecting support plate of the turbine bearing casing of an aero-engine are mostly integral cast structures. The bearing casing, which bears both thermal stress and motor loads, is one of the weakest structures in the engine. Realizing a cooled bearing casing structure design to effectively alleviate thermal stress is of great significance for the design of engines with high thrust-to-weight ratio and long service life.

[0003] However, due to limitations in flow channel smoothness, thermal deformation coordination, assemblability, and structural dimensions, the connections between the inner / outer ring thermal insulation flow channels and the casing mounting edge, as well as the connections between the inner / outer ring thermal insulation flow channels and the support plate thermal insulation cover, are mostly overlapping structures, and often adopt circumferential segmented structures. This makes it impossible to construct a support plate cooling cavity with good sealing performance, resulting in the inability to realize a cooled load-bearing casing structure. Summary of the Invention

[0004] The purpose of this application is to provide a turbine bearing casing sealing and heat insulation flow channel structure to solve or mitigate at least one of the problems in the prior art.

[0005] The technical solution of this application is: a sealed and heat-insulating flow channel structure for a turbine bearing casing, comprising:

[0006] The outer flow channel ring, outer flow channel plate, outer flow channel ring mounting edge, and flexible ring are provided. The front side of the outer flow channel ring is mounted to the outer connecting casing via the outer flow channel ring mounting edge. The rear side of the outer flow channel ring is connected to multiple circumferentially distributed outer flow channel plates via connecting components to form an outer flow channel assembly. The flexible ring is disposed between the outer flow channel ring and the outer flow channel ring mounting edge.

[0007] The inner flow channel ring and the inner flow channel plate are configured such that the front side of the inner flow channel ring is installed on the inner sealing ring, and the rear side of the inner flow channel ring is connected to multiple circumferentially distributed inner flow channel plates through a connecting assembly to form an inner flow channel assembly.

[0008] The support plate basin-side heat insulation cover and the support plate back-side heat insulation cover are disposed between the outer flow channel assembly and the inner flow channel assembly. The support plate basin-side heat insulation cover and the support plate back-side heat insulation cover wrap around the load-bearing casing support plate and are connected to the outer flow channel plate and the inner flow channel plate respectively through connecting components, thereby forming the support plate heat insulation cover assembly.

[0009] The outer flow channel assembly, inner flow channel assembly, and support plate heat insulation cover assembly form a heat insulation flow channel structure, and together with the outer connecting casing, load-bearing casing, inner sealing ring, and outer duct casing, they constitute a cooling air duct chamber.

[0010] Furthermore, the flexible ring is an axially compressible circular ring structure with staggered bosses on both sides.

[0011] Furthermore, the outer flow channel ring mounting edge is equipped with multiple radially distributed protrusions that engage with grooves on the outer connecting casing to achieve radial centering of the front end of the outer flow channel.

[0012] Furthermore, at least one U-shaped ring structure is provided in the middle section of the outer flow channel ring mounting edge.

[0013] Furthermore, it also includes a support frame and radial pins. The back side of the support plate basin-side heat insulation cover and the back side of the support plate back-side heat insulation cover are connected to the support frame. The support frame is positioned and installed on the load-bearing casing by radial pins, realizing the overall axial, circumferential positioning and radial centering of the heat insulation channel structure.

[0014] Furthermore, the inner flow channel plate, outer flow channel plate, inner flow channel ring, and outer flow channel ring are formed by stamping thin-walled sheet metal parts.

[0015] Furthermore, the connecting assembly includes connecting screws, a support plate nut, and rivets. The support plate portion of the support plate nut is connected to the outer component of the flow channel assembly structure via rivets. The connecting screws cooperate with the support plate nut on the outer component from the inside out of the flow channel assembly, thereby realizing the connection of each component.

[0016] Furthermore, the connecting screw is a countersunk screw, and a flared structure is formed on the thin-walled sheet metal part by means of machining, and the conical head of the countersunk screw is sunk into the flared structure of the thin-walled sheet metal part.

[0017] Furthermore, the inner and outer flow channels are provided with back-protruding flared openings formed by stamping, which provide sufficient contact area for the connecting screws.

[0018] Furthermore, a bulge structure is provided at the connection points of the support plate nuts of the inner flow channel ring and the outer flow channel ring cylinder and the support plate basin-side heat insulation cover and the support plate back-side heat insulation cover, in order to avoid the protruding horn-shaped opening on the back of the inner flow channel plate and / or the outer flow channel plate. After the adjacent parts are connected, the bulge structure is pressed tightly around its perimeter by the mating surfaces on both sides and the rivet heads on both sides.

[0019] The turbine bearing casing sealing and heat insulation structure provided in this application constructs a support plate cooling cavity by establishing a sealed and heat-insulating flow channel, which can introduce cooling air for circulation to improve the thermal environment of the bearing casing and extend its service life. The turbine bearing casing sealing and heat insulation structure of this application has the characteristics of compact structure, high reliability, and good manufacturability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0021] Figure 1 This is a schematic diagram of the sealing and heat insulation flow channel structure of the turbine bearing casing in this application.

[0022] Figure 2 This is a schematic diagram of the flexible ring in this application.

[0023] Figure 3 This is a schematic diagram of the connection components of this application.

[0024] Figure 4 This is a schematic diagram of the bulge structure of this application. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0026] This application provides a turbine load-bearing casing sealing and heat-insulating flow channel structure with good sealing performance. The structure is composed of components such as inner / outer flow channel rings, inner / outer flow channel plates, and support plate heat insulation covers, which are connected by connectors. The entire sealing and heat-insulating flow channel structure is axially and circumferentially positioned by the load-bearing casing.

[0027] like Figure 1 As shown, the turbine bearing casing sealing and heat insulation flow channel structure 100 provided in this application includes: an outer flow channel ring 101, an outer flow channel plate 102, an outer flow channel ring mounting edge 103, a flexible ring 104, an inner flow channel ring 105, an inner flow channel plate 106, a support plate basin-side heat insulation cover 107, a support plate back-side heat insulation cover 108, and multiple connecting components 109.

[0028] The outer flow channel ring 101 is mounted to the outer connecting housing 201 via an outer flow channel ring mounting edge 103 at its front side. A flexible ring 104 is provided between the outer flow channel ring 101 and the outer flow channel ring mounting edge 103. The rear side of the outer flow channel ring 101 is connected to multiple circumferentially distributed outer flow channel plates 102 via a connecting assembly 109, thereby forming an outer flow channel assembly. The outer flow channel ring mounting edge 103 achieves radial centering of the front end of the outer flow channel by engaging with grooves on the outer connecting housing 201 through multiple circumferentially distributed radial protrusions.

[0029] The front side of the inner flow channel ring 105 is mounted on the inner sealing ring 204, and the rear side of the inner flow channel ring 105 is connected to multiple circumferentially distributed inner flow channel plates 106 via a connecting assembly 109, thereby forming an inner flow channel assembly. The inner flow channel ring 105 is connected to the load-bearing casing 202 via the relatively flexible inner sealing ring 204, achieving radial centering of the front end of the inner flow channel.

[0030] The basin-side heat insulation cover 107 and the back-side heat insulation cover 108 of the support plate are disposed between the outer flow channel assembly and the inner flow channel assembly. The basin-side heat insulation cover 107 and the back-side heat insulation cover 108 of the support plate wrap around the load-bearing casing support plate 203 and are connected to the outer flow channel plate 102 and the inner flow channel plate 106 respectively through the connecting assembly 109, thereby forming the support plate heat insulation cover assembly.

[0031] The outer flow channel assembly, the inner flow channel assembly, and the support plate heat insulation cover assembly form a heat insulation flow channel structure, which together with the outer connecting casing 201, the load-bearing casing 202, the inner sealing ring 204, and the outer duct casing 206 constitute a cooling air duct.

[0032] In addition, this application also includes a support frame 110, with the support plate basin-side heat insulation cover 107 and the support plate back-side heat insulation cover back side 108 connected to the support frame 110. The support frame 110 is positioned and installed on the load-bearing casing 202 by radial pins 111, realizing the overall axial, circumferential positioning and radial centering of the heat insulation flow channel structure.

[0033] In this application, the outer flow channel ring 101 is integrally formed by welding the front end forged connecting ring to the rear end sheet metal stamped cylinder.

[0034] The outer flow channel assembly is located at the gas inlet end. The radial inner side of the outer flow channel ring mounting edge 103 is subjected to a high temperature level due to gas impact, while the outer side is affected by the low-temperature bypass airflow and has a lower temperature level, resulting in a large radial temperature gradient. This leads to poor radial thermal deformation coordination and high thermal stress level in the outer flow channel ring mounting edge 103. To ensure structural reliability, this application provides at least one U-shaped ring structure in the middle section of the outer flow channel ring mounting edge 103, which can effectively coordinate radial thermal deformation and reduce the thermal stress of the mounting edge and the outer flow channel ring.

[0035] In this application, the outer flow channel assembly, formed by connecting the outer flow channel ring 101, the outer flow channel plate 102, the support plate basin-side heat insulation cover 107, and the support plate back-side heat insulation cover 108, is axially and simultaneously positioned at both the front and rear ends onto the outer connecting casing 201 and the load-bearing casing 202. Since a significant temperature difference between the two is unavoidable, the outer flow channel ring 101 needs to have good thermal deformation coordination capabilities. Therefore, in this application, an axially compressible flexible ring 104 with staggered bosses on both sides is provided between the outer flow channel ring mounting edge 103 and the outer flow channel ring 101. Figure 2 As shown.

[0036] In the non-working state, the flexible ring 104 has a certain amount of compression, allowing the outer flow channel ring 101 and the outer flow channel ring mounting edge 103 to engage axially through slightly raised stepped structures. In the working state, the outer flow channel assembly expands forward relative to the outer connecting casing 201, further compressing the flexible ring 104. The outer flow channel ring 101 and the outer flow channel ring mounting edge 103 no longer engage axially, and the outer flow channel ring 101 expands radially to fit tightly against the outer flow channel ring mounting edge 103, achieving a seal and radial centering function through the outer flow channel ring mounting edge 103.

[0037] Due to space constraints, structures such as the outer flow channel ring, outer flow channel plate, inner flow channel ring, and inner flow channel plate cannot be directly connected by bolts and nuts. This application provides a connection component 109 with a special structure, such as... Figure 3 As shown, the connecting assembly includes a connecting screw 1091, a support plate nut 1092, and a rivet 1093. This application will use the connection between the outer flow channel ring 101 and the outer flow channel plate 102 as an example for illustration. The support plate portion of the support plate nut 1092 is connected to the outer outer flow channel ring 101 via the rivet 1093. The connecting screw 1091 passes radially from the inside to the outside through the outer flow channel plate 102 and engages with the support plate nut 1092 on the outer flow channel ring 101, thereby achieving the connection between the outer flow channel ring 101 and the outer flow channel plate 102. It should be noted that the support plate nut 1092 is installed on the outer component of the flow channel assembly by rivets 1092—including but not limited to the outer flow channel ring 101, the inner flow channel ring 105, the support plate basin-side heat insulation cover 107, or the support plate back-side heat insulation cover 108, while the connecting screw 1091 is installed on the inner component of the flow channel assembly—for example, the outer flow channel plate 102 that mates with the outer flow channel ring 101 or the support plate basin-side heat insulation cover 107 / support plate back-side heat insulation cover 108, and the inner flow channel plate 106 that mates with the inner flow channel ring 105 or the support plate basin-side heat insulation cover 107 / support plate back-side heat insulation cover 108.

[0038] To control the manufacturing cost and weight of the insulated flow channel structure, the inner and outer flow channel plates and inner and outer flow channel rings in this application are formed by stamping thin-walled sheet metal parts. Furthermore, to avoid the head of the connecting bolt 1091 protruding from the gas flow channel and causing flow loss, the connecting screw 1091 in this application is usually a countersunk screw. At the same time, a flared structure is formed on the thin-walled sheet metal part by machining, and the conical head of the countersunk screw is sunk into the flared structure of the thin-walled sheet metal part, thereby forming a smooth surface on the inner wall of the flow channel.

[0039] Furthermore, due to wall thickness limitations, the machined flared structure cannot provide a sufficient contact area, compromising the reliability of the connection. Therefore, stamped, protruding flared openings are incorporated into the inner and outer flow channel plates to provide sufficient contact area for the countersunk screws, ensuring reliability. For example... Figure 4As shown, a bulge structure 112 is provided at the connection of the cylinder and the support plate basin / back side heat insulation cover of the inner / outer flow channel ring to avoid the protruding horn-shaped opening on the back of the inner / outer flow channel plate. After the adjacent parts are connected, the bulge structure 112 is pressed by the mating surfaces on both sides and the rivet heads on both sides to ensure the sealing of the mating surfaces.

[0040] The assembly process of the heat-insulating flow channel structure in this application is as follows:

[0041] After the load-bearing casing 202 and the support frame 110 are connected by radial pins 111, the heat insulation cover 107 on the basin side of the support plate is first installed onto the support frame 110 using countersunk screws and self-locking nuts.

[0042] Then the back heat insulation cover 108 of the support plate is connected to the basin heat insulation cover 107 of the support plate by countersunk screws, and is installed onto the support frame 110 by countersunk screws and self-locking nuts.

[0043] Then, while connecting the outer connecting housing 201 to the load-bearing housing 202, the protrusion of the outer flow channel ring mounting edge 103 is inserted into the groove of the outer connecting housing 201, and the inner flow channel assembly is connected to the inner sealing ring 204 before the inner sealing ring 204 is connected to the load-bearing housing 202.

[0044] Finally, the outer flow channel plate 102 is connected to the outer flow channel ring 101, the basin-side shroud 107 of the support plate, and the back-side shroud 108 of the support plate using countersunk screws. The inner flow channel plate 106 is connected to the inner flow channel ring 105, the basin-side shroud 107 of the support plate, and the back-side shroud 108 of the support plate using countersunk screws, thus completing the assembly of the heat-insulating flow channel structure.

[0045] The turbine bearing casing sealing and heat insulation structure provided in this application constructs a support plate cooling cavity by establishing a sealed and heat-insulating flow channel, which can introduce cooling air for circulation to improve the thermal environment of the bearing casing and extend its service life. The turbine bearing casing sealing and heat insulation structure of this application has the characteristics of compact structure, high reliability, and good manufacturability.

[0046] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A sealed and heat-insulating flow channel structure for a turbine bearing casing, characterized in that, include: The outer flow channel ring (101), outer flow channel plate (102), outer flow channel ring mounting edge (103), and flexible ring (104) are provided. The front side of the outer flow channel ring (101) is mounted on the outer connecting casing (201) through the outer flow channel ring mounting edge (103). The rear side of the outer flow channel ring (101) is connected to multiple circumferentially distributed outer flow channel plates (102) through a connecting component (109) to form an outer flow channel assembly. The flexible ring (104) is disposed between the outer flow channel ring (101) and the outer flow channel ring mounting edge (103). The flexible ring (104) is an axially compressible circular ring structure with staggered bosses on both sides. In the non-working state, the flexible ring (104) has a certain amount of compression. In the working state, the flexible ring (104) is further compressed, and the outer flow channel ring (101) and the outer flow channel ring mounting edge (103) no longer engage axially. The inner flow channel ring (105) and the inner flow channel plate (106) are respectively installed on the front side of the inner flow channel ring (105) and connected to the rear side of the inner flow channel ring (105) and multiple circumferentially distributed inner flow channel plates (106) through the connecting assembly (109) to form an inner flow channel assembly. The support plate basin-side heat insulation cover (107) and the support plate back-side heat insulation cover (108) are disposed between the outer flow channel assembly and the inner flow channel assembly. The support plate basin-side heat insulation cover (107) and the support plate back-side heat insulation cover (108) wrap the load-bearing casing support plate (203) and are connected to the outer flow channel plate (102) and the inner flow channel plate (106) respectively through the connecting assembly (109), thereby forming the support plate heat insulation cover assembly. The outer flow channel assembly, inner flow channel assembly and support plate heat insulation cover assembly form a heat insulation flow channel structure, and together with the outer connecting casing (201), load-bearing casing (202), inner sealing ring (204) and outer duct casing (206) form a cooling air duct.

2. The turbine bearing casing sealing and heat insulation flow channel structure as described in claim 1, characterized in that, The outer flow channel ring mounting edge (103) achieves radial centering of the front end of the outer flow channel by cooperating with the groove provided on the outer connecting casing (201) through multiple radially distributed radial protrusions in the circumferential direction.

3. The turbine bearing casing sealing and heat insulation flow channel structure as described in claim 2, characterized in that, At least one U-shaped ring structure is provided in the middle section of the outer flow channel ring mounting edge (103).

4. The turbine bearing casing sealing and heat insulation flow channel structure as described in claim 1, characterized in that, It also includes a support frame (110) and radial pins (111). The heat insulation cover (107) on the basin side of the support plate and the back side (108) of the heat insulation cover on the back side of the support plate are connected to the support frame (110). The support frame (110) is positioned and installed on the load-bearing casing (202) by the radial pins (111), so as to realize the overall axial and circumferential positioning and radial centering of the heat insulation flow channel structure.

5. The turbine bearing casing sealing and heat insulation flow channel structure as described in claim 1, characterized in that, The inner flow channel plate (106), outer flow channel plate (102), inner flow channel ring (105), and outer flow channel ring (101) are formed by stamping thin-walled sheet metal parts.

6. The turbine bearing casing sealing and heat-insulating flow channel structure as described in claim 5, characterized in that, The connecting assembly includes a connecting screw (1091), a support plate nut (1092), and a rivet (1093). The support plate portion of the support plate nut (1092) is connected to the outer component of the flow channel assembly structure by the rivet (1093). The connecting screw (1091) is inserted from the inside of the flow channel assembly to the outside and engages with the support plate nut (1092) on the outer component, thereby realizing the connection of each component.

7. The turbine bearing casing sealing and heat-insulating flow channel structure as described in claim 6, characterized in that, The connecting screw (1091) is a countersunk screw, which is formed into a flared structure on the thin-walled sheet metal part by means of machining. The conical head of the countersunk screw is sunk into the flared structure of the thin-walled sheet metal part.

8. The turbine bearing casing sealing and heat-insulating flow channel structure as described in claim 7, characterized in that, The inner flow channel plate (106) and the outer flow channel plate (102) are provided with back protruding flared mouths formed by stamping, which are used to provide sufficient contact area for connecting screws.

9. The turbine bearing casing sealing and heat insulation flow channel structure as described in claim 8, characterized in that, A bulge structure (112) is provided at the connection of the support plate nuts of the inner flow channel ring (105) and the outer flow channel ring (101) cylinder and the support plate basin side heat insulation cover (107) and the support plate back side heat insulation cover (108) to avoid the protruding horn mouth on the back of the inner flow channel plate and / or the outer flow channel plate. After the adjacent parts are connected, the bulge structure (112) is pressed by the mating surface on both sides and the rivet heads on both sides.

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