Sealing rubber ring for air inlet channel of aero-engine

Abstract

The invention belongs to the technical field of test bed infrastructure maintenance, and particularly relates to an aero-engine air inlet channel sealing rubber ring which is used for sealing a splicing gap between an engine air inlet and an engine ground test process air inlet channel. The sealing rubber ring comprises an upper ring edge, a straight ring edge, a lower ring edge and a convex ring edge which are connected in sequence; the upper ring edge and the lower ring edge are arranged in parallel; the straight ring edge and the convex ring edge are oppositely arranged on the two sides of the upper ring edge and the lower ring edge; an annular cavity is formed among the upper ring edge, the straight ring edge, the lower ring edge and the convex ring edge; the convex ring edge protrudes out of the annular cavity; the rubber ring adopts the arched design, so that the pressure resistance of the contact surface is improved, and the vibration resistance and the sealing property of the part are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of test bench infrastructure maintenance, and in particular relates to an aero-engine air intake duct sealing rubber ring. Background Art

[0002] During the ground test of aircraft engines, in order to ensure the tightness of the connection between the process air inlet and the engine and prevent the gas that has not been rectified by the air inlet from being inhaled into the engine to cause turbulence and surge, it is necessary to design a sealing rubber ring for the connection. The rubber ring must not only have excellent anti-aging function, good vibration resistance, and effective sealing performance, but also be evenly stressed on the contact surface and will not cause local rupture due to stress concentration.

[0003] In the prior art, the sealing ring here uses EPDM rubber with a square cross section. Although this material has strong heat resistance, oxidation resistance and light resistance, it has poor oil resistance, wear resistance and sealing performance. In addition, the cross section of the old rubber ring is rectangular, and the stress surface is uneven, which is easy to concentrate stress. Cracks often appear on the contact surface with the engine, and sometimes cracks, so it is urgent to optimize and improve the design of the rubber ring. Summary of the invention

[0004] In view of this, the present invention provides an aero-engine air intake duct sealing rubber ring, which adopts an arched design to improve the pressure resistance of the contact surface and enhance the vibration resistance and sealing performance of the part.

[0005] The technical solution of the present invention is:

[0006] A sealing rubber ring for an aircraft engine air intake duct, used for sealing a joint gap between an engine air intake port and an engine ground test process air intake duct; the sealing rubber ring comprises an upper ring edge, a straight ring edge, a lower ring edge and a convex ring edge connected in sequence; the upper ring edge is arranged in parallel with the lower ring edge; the straight ring edge and the convex ring edge are arranged oppositely on both sides of the upper ring edge and the lower ring edge; an annular cavity is formed between the upper ring edge, the straight ring edge, the lower ring edge and the convex ring edge; the convex ring edge protrudes from the annular cavity;

[0007] The sealing rubber ring is connected to the air inlet based on the straight ring edge, and the outer side of the convex ring edge contacts the air inlet.

[0008] Furthermore, a wheel rim is provided between the sealing rubber ring and the air inlet; the wheel rim includes a straight ring edge and an upper ring edge that are annularly wrapped from the outside of the sealing rubber ring;

[0009] The lower annular edge contacts the end of the air inlet passage.

[0010] Furthermore, the cross-section of the convex ring edge is an arc shape.

[0011] Furthermore, a plurality of bolt holes are arranged on the straight ring edge, and the sealing rubber ring is connected to the air inlet duct based on bolts passing through the bolt holes.

[0012] Furthermore, the bolt holes are distributed symmetrically with respect to the center, and the angle between adjacent bolt holes is 18°.

[0013] Furthermore, the bolt passes through the bolt hole and the wheel rim and is connected to the air inlet; a spring is sleeved on the bolt column of the bolt, and the spring is arranged between the air inlet and the wheel rim;

[0014] Furthermore, a gasket is provided between the rim and the spring.

[0015] Furthermore, the sealing rubber ring is made of nitrile rubber.

[0016] Furthermore, the thickness of the convex ring edge is greater than that of the upper ring edge, the straight ring edge and the lower ring edge.

[0017] The beneficial effects of the present invention are:

[0018] The invention solves the problems of oil resistance, wear resistance, poor sealing, cracks, stress concentration, etc. from material selection to appearance design. The sealing rubber ring of the invention adopts an arch design to improve the pressure resistance of the contact surface, and adopts nitrile rubber to improve the material's anti-aging function, air tightness and adhesion, thereby improving the vibration resistance and sealing of this part. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a cross-sectional schematic diagram of a sealing rubber ring of an aircraft engine air intake duct in a specific embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall structure of an aero-engine air intake duct sealing rubber ring in a specific embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the installation position of a sealing rubber ring of an aircraft engine air intake duct in a specific embodiment of the present invention;

[0023] Figure 4 It is a cross-sectional view of the installation of a sealing rubber ring of an aircraft engine air intake duct in a specific embodiment of the present invention;

[0024] Among them: 1. Air inlet; 2. Air inlet; 3. Sealing rubber ring; 31. Upper ring edge; 32. Straight ring edge; 33. Lower ring edge; 34. Convex ring edge; 35. Bolt hole; 4. Wheel rim; 5. Bolt; 6. Spring. DETAILED DESCRIPTION

[0025] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0026] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0027] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0028] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The drawings only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0029] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0030] In one embodiment of the present invention, an aero-engine air intake duct sealing rubber ring is provided, such as Figure 1-4As shown, it is used to seal the joint gap between the engine air inlet 2 and the engine ground test process air inlet 1; the sealing rubber ring 3 includes an upper ring edge 31, a straight ring edge 32, a lower ring edge 33 and a convex ring edge 34 connected in sequence; the upper ring edge 31 and the lower ring edge 33 are arranged in parallel; the straight ring edge 32 and the convex ring edge 34 are arranged on both sides of the upper ring edge 31 and the lower ring edge 33 oppositely; an annular cavity is formed between the upper ring edge 31, the straight ring edge 32, the lower ring edge 33 and the convex ring edge 34; the convex ring edge 34 protrudes from the annular cavity;

[0031] The sealing rubber ring 3 is connected to the air inlet 1 based on the straight ring edge 32 , and the outer side of the convex ring edge 34 contacts the air inlet 2 .

[0032] In this embodiment, a wheel rim 4 is further provided between the sealing rubber ring 3 and the air inlet 1; the wheel rim 4 includes a straight ring edge 32 and an upper ring edge 31 that are annularly wrapped from the outside of the sealing rubber ring 3;

[0033] The lower ring edge 33 contacts the end of the air inlet duct 1 .

[0034] In this embodiment, the cross section of the convex ring edge 34 is an arc shape.

[0035] In this embodiment, a plurality of bolt holes 35 are provided on the straight ring edge 32 , and the sealing rubber ring 3 is connected to the air inlet duct 1 based on bolts 5 passing through the bolt holes 35 .

[0036] In this embodiment, the bolt holes 35 are distributed symmetrically with respect to the center, and the angle between adjacent bolt holes 35 is 18°.

[0037] In this embodiment, the bolt 5 passes through the bolt hole 35 and the wheel rim 4 and then connects to the air inlet 1; a spring 6 is sleeved on the bolt column of the bolt 5, and the spring 6 is arranged between the air inlet 1 and the wheel rim 4;

[0038] In this embodiment, a gasket is provided between the wheel rim 4 and the spring 6 .

[0039] In this embodiment, the sealing rubber ring 3 is made of nitrile rubber.

[0040] In this embodiment, the thickness of the convex ring edge 34 is greater than that of the upper ring edge 31 , the straight ring edge 32 and the lower ring edge 33 .

[0041] The sealing rubber ring 3 of this embodiment is a sealing connector between the process air inlet 1 and the mounting surface of the engine air inlet 2 during ground test of a certain type of aircraft engine, and mainly plays the role of vibration reduction, sealing and fixing.

[0042] Material superiority: Nitrile rubber has stronger oil resistance and wear resistance than EPDM rubber, and has good air tightness and adhesion. It is very suitable for the material of the intake duct 1 rubber ring.

[0043] Lifespan: The old square sealing rubber ring 3 made of EPDM rubber needs to be replaced after one year of use, and fatigue cracks will appear in the second year. However, the new arched surface sealing rubber ring 3 made of nitrile rubber will not have fatigue cracks or cracks after two years of use. This shows that the wear resistance and stress absorption performance are excellent.

[0044] For safety reasons, the current conservative design life of the rubber ring is 2 years. The new design of the sealing rubber ring 3 plays a vital role in improving the safety of engine test and the test pass rate.

[0045] Appearance design: The design of the rubber ring installation surface is flat in the direction of the air inlet 1, and arched in the direction of the engine air inlet 2. To ensure that the rubber ring has a certain degree of elasticity and strong support, the internal arched surface is thickened and the inside of the rubber ring is square, which ensures support without affecting the force. There is an opening on the bottom surface for installing bolts 5. The mounting holes of bolts 5 on the rubber ring are symmetrically designed to ensure balanced force after installation.

[0046] Note when installing: Pay attention to the direction when installing the sealing rubber ring 3 on the wheel rim 4. The flat bottom surface is installed in the direction of the air intake 1, and the arched surface is installed in the direction of the engine. When installing, the bolts 5 should be installed on the opposite side. First install the four points of up, down, left, and right, and then install the bolts 5 on the opposite side of other parts.

[0047] Rubber ring installation order:

[0048] During installation, bolt 5 is first installed on the rubber ring, and then bolt 5 is installed on the wheel rim 44.

[0049] Install the washer, spring 6 and washer on the bolt 5.

[0050] The bolt 5 is installed into the mounting edge of the air intake duct 1 .

[0051] Then install the nuts, fuses, and clips.

[0052] Install all bolts 5 on the rubber ring.

[0053] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An aero-engine air intake duct sealing rubber ring, characterized in that: Used to seal the joint gap between the engine air inlet and the engine ground test process air inlet; the sealing rubber ring includes an upper ring edge, a straight ring edge, a lower ring edge and a convex ring edge connected in sequence; the upper ring edge is arranged in parallel with the lower ring edge; the straight ring edge and the convex ring edge are arranged on both sides of the upper ring edge and the lower ring edge oppositely; an annular cavity is formed between the upper ring edge, the straight ring edge, the lower ring edge and the convex ring edge; the convex ring edge protrudes from the annular cavity; The sealing rubber ring is connected to the air inlet based on the straight ring edge, and the outer side of the convex ring edge contacts the air inlet.

2. The aero-engine air intake duct sealing rubber ring according to claim 1, characterized in that: A wheel rim is also provided between the sealing rubber ring and the air inlet; the wheel rim includes a straight ring edge and an upper ring edge that are annularly wrapped from the outside of the sealing rubber ring; The lower annular edge contacts the end of the air inlet passage.

3. The aero-engine air intake duct sealing rubber ring according to claim 2, characterized in that: The cross section of the convex ring edge is an arc shape.

4. The aero-engine air intake duct sealing rubber ring according to claim 3, characterized in that: A plurality of bolt holes are arranged on the straight ring edge, and the sealing rubber ring is connected to the air inlet duct based on bolts passing through the bolt holes.

5. The aero-engine air intake duct sealing rubber ring according to claim 4, characterized in that: The bolt holes are distributed symmetrically with respect to the center, and the angle between adjacent bolt holes is 18°.

6. The aero-engine air intake duct sealing rubber ring according to claim 5, characterized in that: The bolt is connected to the air inlet after passing through the bolt hole and the wheel rim; a spring is sleeved on the bolt column of the bolt, and the spring is arranged between the air inlet and the wheel rim.

7. The aero-engine air intake duct sealing rubber ring according to claim 6, characterized in that: A gasket is arranged between the wheel rim and the spring.

8. The aero-engine air intake duct sealing rubber ring according to claim 7, characterized in that: The material of the sealing rubber ring is nitrile rubber.

9. The aero-engine air intake duct sealing rubber ring according to claim 8, characterized in that: The thickness of the convex ring edge is greater than that of the upper ring edge, the straight ring edge and the lower ring edge.

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