Fan stator assembly connection structure and method for small thrust engine

Abstract

A small-thrust engine fan stator assembly connection structure and method, wherein the assembly connection structure comprises: an outer casing made of composite material, the front end and the rear end having annular connection edges, both of which are covered with front and rear metal edges; a containing ring made of composite material, wound around the outer circumference of the front end of the outer casing; an inner casing front section made of aluminum alloy, arranged in the outer casing front section, the front end and the rear end having annular connection edges, wherein the annular connection edge of the front end is connected with the rearward bent inward protruding part of the front metal edge of the outer casing front end annular connection edge by rivets; an inner casing rear section made of aluminum alloy, arranged in the outer casing rear section, the front end having an annular connection edge; a stator vane ring made of aluminum alloy, arranged in the outer casing, between the inner casing front section and the inner casing rear section, the outer ring front end and the rear end having annular connection edges, connected with the annular connection edges of the rear end of the inner casing rear section and the front end of the inner casing rear section by rivets, and matched with the outer casing with a small gap.

Description

Technical Field

[0001] This application belongs to the field of engine design technology, specifically relating to a stator assembly and connection structure and method for a small thrust engine fan. Background Technology

[0002] High-bypass turbofan engines typically have a diameter of 1900 mm or more, and their fans usually employ a single-layer casing structure, with the fan stator blades welded or bolted to the casing. Small-thrust engines have smaller, more compact fan stator profiles, with fan flow path diameters around 500 mm. While the aerodynamic configuration of the fan booster stage in small-thrust engines is consistent with that of high-bypass turbofan engines, it is not advisable to directly adopt the same fan stator assembly and connection structure, primarily for the following reasons:

[0003] The fan casing of a small thrust engine has a small diameter, thin wall thickness, and narrow stator blade pitch, making it compact in size. The fan stator blades are assembled on the casing by welding or bolting, resulting in low assembly and disassembly efficiency and insufficient structural rigidity.

[0004] It cannot meet the design requirements of lightweight and low-cost small thrust engines.

[0005] For small-thrust engines, the assembly and connection structure of the stator of the high-bypass engine fan needs to be simplified before it can be applied. In addition, the speed of the booster stage of the high-bypass engine fan is about 7,000 rpm, while the speed of the booster stage of the small-thrust engine fan is about 17,000 rpm. During the fan design process, containment, vibration reduction and weight reduction need to be considered.

[0006] In view of the aforementioned technical deficiencies, this application is hereby filed. Summary of the Invention

[0007] The purpose of this application is to provide a stator assembly and connection structure and method for a small thrust engine fan, so as to overcome or mitigate at least one of the known technical defects.

[0008] The technical solution of this application is:

[0009] A stator assembly and connection structure for a small thrust engine fan includes: an outer casing, a containment ring, a front section of an inner casing, a rear section of an inner casing, and a stator blade ring.

[0010] The outer casing is made of composite materials and has annular connecting edges at the front and rear ends, both of which are covered with front and rear metal edging.

[0011] The containment ring is made of composite material and is wrapped around the outer periphery of the front end of the outer casing, corresponding to the area where the rotor blades are located.

[0012] The front section of the inner casing is made of aluminum alloy and is located inside the front section of the outer casing. Its outer wall has multiple annular ribs, and the front and rear ends have annular connecting edges. The annular connecting edge at the front end is connected to the front metal edge of the annular connecting edge at the front end of the outer casing by rivets.

[0013] The rear section of the inner casing is made of aluminum alloy and is located inside the rear section of the outer casing, with an annular connecting edge at the front end;

[0014] A metal support ring is installed between the rear end of the inner casing and the outer casing to support the rear end of the outer casing.

[0015] An annular copper wire mesh is installed between the rear end of the inner casing and the outer casing. The annular copper wire mesh is attached to the back of the metal support ring and has a square cross-section. A sponge is installed inside it.

[0016] The stator blade ring is made of aluminum alloy and is installed inside the outer casing, between the front section and the rear section of the inner casing. Its outer ring has annular connecting edges at the front and rear ends, which are connected to the annular connecting edges at the rear end and front end of the rear section of the inner casing by rivets and fit with a small clearance between it and the outer casing.

[0017] According to at least one embodiment of this application, in the above-described small thrust engine fan stator assembly connection structure, the outer casing and the outer wall of the containment ring are coated with a fire-retardant and corrosion-resistant hard coating.

[0018] According to at least one embodiment of this application, in the above-described small thrust engine fan stator assembly connection structure, the inner wall of the front section of the inner casing is coated with an abrasive coating, which is located in the area where the rotor blades are located.

[0019] According to at least one embodiment of this application, in the above-described small thrust engine fan stator assembly connection structure, the metal support ring has a U-shaped cross-section, its bottom wall is riveted to the rear section of the inner casing, and its two side walls are fitted with the outer casing with a small clearance.

[0020] According to at least one embodiment of this application, in the above-described small thrust engine fan stator assembly connection structure, the rear end of the inner casing is fitted with a sealing rubber ring, and the sealing rubber ring is attached to the rear of the annular copper wire mesh.

[0021] According to at least one embodiment of this application, in the above-described small thrust engine fan stator assembly connection structure, the inner ring front end and rear end of the stator blade ring have annular sealing edges, wherein a silicone rubber ring is bonded to the outer side of the annular sealing edge at the front end and a silicone rubber ring is bonded to the inner side of the annular sealing edge at the rear end.

[0022] The space between the outer casing and the front section of the inner casing, and the rear section of the inner casing, is filled with composite honeycomb material.

[0023] According to at least one embodiment of this application, in the above-described small thrust engine fan stator assembly connection structure, a sealing ring is provided inside the inner ring of the stator blade ring. The outer edge of the sealing ring is formed at the front end of the inner ring of the stator blade ring, the inner edge is inclined backward, and an annular sealing edge is formed. A silicone rubber ring is bonded to the inner side of the annular sealing edge.

[0024] A method for assembling a stator assembly connection structure for a small thrust engine fan, used to assemble the aforementioned stator assembly connection structure for a small thrust engine fan, comprising:

[0025] External casing assembly assembly steps:

[0026] The outer casing assembly is formed by wrapping the containment ring around the outer periphery of the outer casing and covering the annular connecting edge at the rear end of the outer casing with front and rear metal edging. A fire-retardant and corrosion-resistant hard coating is applied to the outer wall of the outer casing and the containment ring.

[0027] Inner casing assembly assembly steps:

[0028] The inner casing assembly consists of the front section of the inner casing, the stator blade ring, and the rear section of the inner casing. A metal support ring is mounted on the rear section of the inner casing. The annular connecting edge of the front section of the inner casing and the front metal edging of the annular connecting edge of the front end of the outer casing are connected. An abrasive coating is sprayed inside the front section of the inner casing. Silicone rubber rings are bonded to the annular sealing edges of the front and rear ends of the inner ring of the stator blade ring. Silicone rubber rings are also bonded to the annular sealing edges of the sealing ring, thus forming the inner casing assembly.

[0029] Assembly steps for inner and outer casing components:

[0030] Install the inner casing assembly into the outer casing assembly from front to back, connect the front end of the outer casing to the front and rear metal edging, insert the annular copper wire mesh from the rear end between the rear end of the inner casing and the outer casing, and install the sealing rubber ring. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the assembly and connection structure of the fan stator of a small thrust engine provided in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the annular copper wire mesh and sponge body provided in the embodiments of this application;

[0033] Figure 3 This is a schematic diagram of the outer casing assembly provided in an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the inner casing assembly provided in an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of the assembly of the fan rotor unit, fan stator unit, booster stage rotor unit, and intermediate casing unit provided in the embodiments of this application;

[0036] Figure 6 This is a schematic diagram showing the assembled fan rotor unit, fan stator unit, booster stage rotor unit, and intermediate casing unit provided in the embodiments of this application;

[0037] in:

[0038] 1-Outer casing; 2-Enclosure ring; 3-Front section of inner casing; 4-Rear section of inner casing; 5-Stator vane ring; 6-Metal support ring; 7-Annular copper wire mesh; 8-Sponge body; 9-Sealing rubber ring; 10-Sealing ring.

[0039] To better illustrate this embodiment, some content in the accompanying drawings may be omitted, enlarged, or reduced. They are for illustrative purposes only and should not be construed as limiting the scope of this application. Detailed Implementation

[0040] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, and other related parts can be referred to the general design.

[0041] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The word "comprising" as used in this application description indicates that the concept preceding the word encompasses the concepts listed following the word and their equivalents, without excluding other related concepts.

[0042] Furthermore, the terms indicating location used in the description of this application are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation" and "connection" used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0043] A stator assembly and connection structure for a small thrust engine fan, such as Figure 1 As shown, it includes an outer casing 1, an enclosure ring 2, a front section of an inner casing 3, a rear section of an inner casing 4, and a stator blade ring 5.

[0044] The outer casing 1 is made of composite material and has annular connecting edges at the front and rear ends for connecting with the annular connecting edges on the front and rear component casings by bolts.

[0045] Since composite materials cannot directly withstand bolt compression, in order to prevent local stress concentration in the composite materials, the annular connecting edges at the front and rear ends of the outer casing 1 are designed to be covered with front and rear metal edgings, and connected to the metal edgings by rivets. The rivets do not extend beyond the end faces of the annular connecting edges at the front and rear ends of the outer casing 1.

[0046] The containment ring 2 is made of composite material, specifically aramid fiber reinforced epoxy resin-based composite satin fabric prepreg, which is wound around the front end of the outer casing 1 and hot-pressed in an autoclave to improve the rigidity of the structure, corresponding to the area where the rotor blades are located.

[0047] The outer walls of the outer casing 1 and the containment ring 2 are coated with a fire-retardant and corrosion-resistant hard coating.

[0048] The inner casing front section 3 is made of aluminum alloy and is set inside the outer casing 1 front section. Its outer wall has multiple annular ribs, and the front and rear ends have annular connecting edges. The annular connecting edge at the front end is connected to the front metal edge of the annular connecting edge at the front end of the outer casing 1 by rivets, and the two are positioned by a stop, so as to support the front end of the outer casing 1.

[0049] The inner wall of the front section 3 of the inner casing is coated with an abrasive coating, which corresponds to the area where the rotor blades are located.

[0050] The rear section 4 of the inner casing is made of aluminum alloy and is located inside the rear section of the outer casing 1, with an annular connecting edge at the front end.

[0051] A metal support ring 6 is installed between the rear end of the inner casing 4 and the outer casing 1 to support the rear end of the outer casing 1. The metal support ring 6 has a U-shaped cross-section, and its bottom wall is connected to the rear end of the inner casing 4 by rivets. The two side walls are fitted with the outer casing 1 with a small clearance to increase the rigidity of the casing and to bear the role of the stop fit.

[0052] An annular copper wire mesh 7 is installed between the rear end of the inner casing 4 and the outer casing 1 to improve the potential difference between the materials and prevent potential corrosion. The annular copper wire mesh 7 is attached to the rear of the metal support ring 6, has a square cross-section, and contains a sponge 8. Figure 2 As shown, it is used to absorb vibrations between the casings.

[0053] The rear end of the inner casing 4 is fitted with a sealing ring 9, which is attached to the back of the annular copper wire mesh 7 for end face sealing.

[0054] The stator blade ring 5 is made of aluminum alloy and is installed inside the outer casing 1, between the front section 3 and the rear section 4 of the inner casing. Its outer ring has annular connecting edges at the front and rear ends, which are connected to the annular connecting edges at the rear end and front end of the rear section 4 of the inner casing by rivets. It fits with the outer casing 1 with a small gap so as to support the middle section of the outer casing 1. Together, they form comprehensive support for the front, middle and rear sections of the outer casing 1 to improve the rigidity of the outer casing 1.

[0055] The inner ring of the stator blade ring 5 has annular sealing edges at the front and rear ends. A silicone rubber ring is bonded to the outer side of the annular sealing edge at the front end, and a silicone rubber ring is bonded to the inner side of the annular sealing edge at the rear end. This is used to seal the fan rotor and the booster stage rotor, replacing the powder coating. The silicone rubber ring is a flexible coating that can provide good anti-wear, vibration reduction and sealing at high speeds.

[0056] A sealing ring 10 is provided inside the inner ring of the stator vane ring 5. The outer edge of the sealing ring 10 is formed at the front end of the inner ring of the stator vane ring 5, and the inner edge is inclined backward to form an annular sealing edge. A silicone rubber ring is bonded to the inner side of the annular sealing edge for sealing with the booster stage rotor.

[0057] The stator blade ring 5 and sealing ring 10 are an integral structure, which not only reduces the assembly difficulty but also improves the rigidity of the entire stator.

[0058] The space between the outer casing 1 and the front section 3 and rear section 4 of the inner casing can be filled with composite honeycomb, specifically epoxy resin-based aramid fiber reinforced composite honeycomb, to improve the connection rigidity, vibration damping, sealing and impact resistance of the stator structure.

[0059] The small-thrust engine fan stator assembly and connection structure disclosed in the above embodiments can be assembled using the following method:

[0060] External casing assembly assembly steps:

[0061] The containment ring 2 is wound around the outer periphery of the outer casing 1, and the annular connecting edge at the rear end of the outer casing 1 is covered with front and rear metal edging. A fire-retardant and corrosion-resistant hard coating is applied to the outer wall of the outer casing 1 and the containment ring 2 to form the outer casing assembly, resulting in a lightweight outer casing, such as... Figure 3 As shown.

[0062] Inner casing assembly assembly steps:

[0063] The inner casing front section 3, stator vane ring 5, and inner casing rear section 4 are connected. A metal support ring 6 is installed on the inner casing rear section 4. The annular connecting edge of the inner casing front section 3 and the front metal edging of the annular connecting edge of the outer casing 1 are connected. An abrasive coating is sprayed inside the inner casing front section 3. Silicone rubber rings are bonded to the annular sealing edges at the front and rear ends of the inner ring of the stator vane ring 5. Silicone rubber rings are also bonded to the annular sealing edges of the sealing ring 10, forming the inner casing assembly. Figure 4 As shown.

[0064] Assembly steps for inner and outer casing components:

[0065] The inner casing assembly is inserted into the outer casing assembly from front to back. The front end of the outer casing 1 is connected to the front and rear metal edging. The annular copper wire mesh 7 is inserted from the rear end between the rear end of the inner casing 4 and the outer casing 1, and the sealing rubber ring 9 is installed.

[0066] The fan stator assembly and connection structure of the small-thrust engine disclosed in the above embodiments is a fan stator unit, which can greatly simplify the assembly process of fan components. The assembly of the fan is simplified to the transfer and assembly of four unit bodies: the fan rotor unit, the fan stator unit, the booster stage rotor unit, and the intermediate casing unit. Figure 5 As shown, the core air compression components of a small thrust engine, once assembled, are as follows: Figure 6 As shown.

[0067] The small-thrust engine fan stator assembly and connection structure disclosed in the above embodiments fully utilizes the advantages of composite material casing and metal casing in design, processing and assembly, forming a dual-material, double-layer casing unit with high rigidity and high assembly and disassembly efficiency. It uses an adhesive silicone rubber coating instead of a powder coating to provide a sealing coating with excellent vibration damping, sealing performance and low wear for the high-speed rotating rotor. While reducing costs and simplifying the assembly process, it achieves weight reduction and vibration reduction functions, which is more conducive to the structural design of small-thrust stage fan stators and meets the design requirements of lightweight and low cost for small-thrust engines.

[0068] The technical solution of this application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A stator assembly and connection structure for a small thrust engine fan, characterized in that, include: Includes outer casing (1), containment ring (2), front section of inner casing (3), rear section of inner casing (4), and stator blade ring (5); The outer casing (1) is made of composite material and has annular connecting edges at the front and rear ends, both of which are covered with front and rear metal edging. The containment ring (2) is made of composite material and is wrapped around the outer periphery of the front end of the outer casing (1), corresponding to the area where the rotor blades are located; The front section (3) of the inner casing is made of aluminum alloy and is set inside the front section of the outer casing (1). Its outer wall has multiple annular ribs, and the front and rear ends have annular connecting edges. The annular connecting edge at the front end is connected to the front metal edge of the annular connecting edge at the front end of the outer casing (1) by rivets. The rear section (4) of the inner casing is made of aluminum alloy and is located inside the rear section of the outer casing (1), with an annular connecting edge at the front end; A metal support ring (6) is provided between the rear end of the inner casing (4) and the outer casing (1) to support the rear end of the outer casing (1); An annular copper wire mesh (7) is provided between the rear end of the inner casing (4) and the outer casing (1). The annular copper wire mesh (7) is attached to the back of the metal support ring (6), and has a square cross-section. A sponge (8) is provided inside it. The stator blade ring (5) is made of aluminum alloy and is installed inside the outer casing (1), located between the front section (3) and the rear section (4) of the inner casing. Its outer ring has annular connecting edges at the front and rear ends, which are connected to the annular connecting edges at the rear end and front end of the rear section (4) of the inner casing by rivets and fit with a small gap between it and the outer casing (1).

2. The small thrust engine fan stator assembly and connection structure according to claim 1, characterized in that, The outer casing (1) and the outer wall of the containment ring (2) are coated with a fireproof and corrosion-resistant hard coating.

3. The small thrust engine fan stator assembly and connection structure according to claim 2, characterized in that, The inner wall of the front section (3) of the inner casing is coated with an abrasive coating, which corresponds to the area where the rotor blades are located.

4. The small thrust engine fan stator assembly and connection structure according to claim 3, characterized in that, The metal support ring (6) has a U-shaped cross section, and its bottom wall is connected to the rear section (4) of the inner casing with rivets. The two side walls are fitted with the outer casing (1) with a small gap.

5. The small thrust engine fan stator assembly and connection structure according to claim 4, characterized in that, The rear end of the inner casing (4) is fitted onto the sealing ring (9), and the sealing ring (9) is attached to the back of the annular copper wire mesh (7).

6. The small thrust engine fan stator assembly and connection structure according to claim 5, characterized in that, The inner ring of the stator leaf ring (5) has annular sealing edges at the front and rear ends. A silicone rubber ring is bonded to the outer side of the annular sealing edge at the front end and a silicone rubber ring is bonded to the inner side of the annular sealing edge at the rear end. The outer casing (1) is filled with composite honeycomb material between the front section (3) of the inner casing and the rear section (4) of the inner casing.

7. The small thrust engine fan stator assembly and connection structure according to claim 6, characterized in that, A sealing ring (10) is provided inside the inner ring of the stator blade ring (5). The outer edge of the sealing ring (10) is formed at the front end of the inner ring of the stator blade ring (5), and the inner edge is inclined backward and forms an annular sealing edge. A silicone rubber ring is bonded to the inner side of the annular sealing edge.

8. A method for assembling a stator assembly connection structure for a small thrust engine fan, used to assemble the stator assembly connection structure for a small thrust engine fan as described in claim 7, characterized in that... include: External casing assembly assembly steps: The containment ring (2) is wrapped around the outer periphery of the outer casing (1), and the annular connecting edge at the rear end of the outer casing (1) is covered with front and rear metal edging. Fireproof and corrosion-resistant hard coating is applied to the outer walls of the outer casing (1) and the containment ring (2) to form the outer casing assembly. Inner casing assembly assembly steps: Connect the front section (3) of the inner casing, the stator blade ring (5) and the rear section (4) of the inner casing. Install a metal support ring (6) on the rear section (4) of the inner casing. Connect the annular connecting edge of the front section (3) of the inner casing and the front metal edge of the annular connecting edge of the outer casing (1). Spray a wear-resistant coating inside the front section (3) of the inner casing. Adhere silicone rubber rings to the annular sealing edges at the front and rear ends of the inner ring of the stator blade ring (5). Adhere silicone rubber rings to the annular sealing edges of the sealing ring (10) to form the inner casing assembly. Assembly steps for inner and outer casing components: Insert the inner casing assembly into the outer casing assembly from front to back, connect the front end of the outer casing (1) with the front and rear metal edging, insert the annular copper wire mesh (7) from the rear end between the rear end of the inner casing (4) and the outer casing (1), and insert the sealing rubber ring (9).

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