Graphite sealing structure with vein type dynamic pressure groove

Abstract

The utility model discloses a graphite sealing structure with vein type dynamic pressure grooves, which comprises a sealing seat, a graphite sealing ring petal and a circumferential spring, the inner circumferential surface of the graphite sealing ring petal is provided with a circumferential unloading groove, a plurality of axial unloading grooves and the vein type dynamic pressure grooves, and the axial unloading grooves are arranged at intervals along the circumferential direction of the graphite sealing ring petal. One end of the axial unloading groove is communicated with the high-pressure inlet side, the other end of the axial unloading groove is communicated with the circumferential unloading groove, the multiple vein type dynamic pressure grooves are formed in the circumferential direction of the graphite sealing ring petal at intervals, and each vein type dynamic pressure groove comprises a main vein groove, a first side vein groove and a second side vein groove; the first side pulse groove and the second side pulse groove are connected to the two sides of the main pulse groove in a spaced mode and are obliquely arranged in the rotating direction of the rotor. The graphite sealing structure with the vein type dynamic pressure groove is simple in structure and capable of enhancing dynamic pressure lubrication of graphite sealing fluid, reducing abrasion of the sealing structure and prolonging the service life of the sealing structure.

Description

Technical Field

[0001] The utility model relates to the field of aviation engine bearing cavity sealing, and in particular provides a graphite sealing structure with a blade vein type dynamic pressure groove. Background Art

[0002] Circumferential graphite seals are mainly used in aircraft engine bearing cavities. Their function is to prevent the leakage of lubricating oil in the bearing cavity under high temperature and high pressure difference, and to prevent the leakage of high pressure gas into the bearing cavity. They are ideal sealing devices for modern aircraft engines. However, under low engine speed conditions, the graphite sealing ring petals are very likely to rub against the rotor and fail, which seriously affects the engine performance and causes failure. The reason for the friction between the graphite sealing ring petals and the rotor is that under low speed conditions, the dynamic pressure lubrication effect generated by the graphite sealing ring petals fails functionally, that is, the dynamic pressure effect cannot ensure that the graphite sealing ring petals float, and due to the gravity of the graphite sealing ring petals themselves, they rest on the rotor, which will cause wear on the sealing surface.

[0003] Therefore, proposing a new type of graphite sealing structure to effectively enhance the fluid dynamic pressure effect, ensure the floating of the graphite sealing ring petals, and reduce the wear of the sealing ring has become an urgent problem to be solved. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a graphite sealing structure with a blade vein type dynamic pressure groove to solve the problem that the sealing ring petal is very likely to fail due to friction with the rotor at low engine speed stage, seriously affecting the engine performance and causing failure.

[0005] The technical solution provided by the utility model is: a graphite sealing structure with a blade vein type dynamic pressure groove, comprising: a sealing seat, a graphite sealing ring petal and a circumferential spring, wherein the graphite sealing ring petals are multiple, the multiple graphite sealing ring petals are arranged in the sealing seat and are tightly sealed to the outside of the rotor by the circumferential spring, the inner circumferential surface of the graphite sealing ring petal is provided with a circumferential unloading groove, an axial unloading groove and a blade vein type dynamic pressure groove, the axial unloading groove is multiple and is arranged at intervals along the circumference of the graphite sealing ring petal, the axial One end of the axial unloading groove is connected to the high-pressure inlet side, and the other end is connected to the circumferential unloading groove. There are multiple blade vein type dynamic pressure grooves and they are arranged at intervals along the circumference of the graphite sealing ring petal. The blade vein type dynamic pressure groove includes a main vein groove, a first side vein groove and a second side vein groove. One end of the main vein groove is vertically connected to the axial unloading groove. There are multiple first side vein grooves and second side vein grooves and they are respectively connected to both sides of the main vein groove at intervals. The first side vein groove and the second side vein groove are both inclined toward the rotation direction of the rotor.

[0006] Preferably, the circumferential unloading groove is close to the low-pressure side of the graphite sealing ring petal.

[0007] Further preferably, the first lateral groove and the second lateral groove have the same included angle with the main groove, and the included angle is 30° to 60°.

[0008] More preferably, the intervals between adjacent first side grooves and adjacent second side grooves are equal.

[0009] Further preferably, the first side grooves and the second side grooves are alternately arranged on both sides of the main groove.

[0010] Further preferably, the first side vein groove and the second side vein groove have the same size.

[0011] Further preferably, the depths of the first side vein groove and the second side vein groove both decrease gradually or in a stepwise manner along the rotation direction of the rotor.

[0012] Further preferably, overlapping grooves and overlapping joints are correspondingly provided at both ends of the graphite sealing ring petal.

[0013] Further preferably, the high-pressure inlet end face of the graphite sealing ring petal is provided with an axial spring accommodating groove, and an axial compression spring is installed in the axial spring accommodating groove. The axial compression spring is abutted against a fixed baffle plate and presses the graphite sealing ring petal onto the sealing seat through an elastic retaining ring that cooperates with the baffle plate.

[0014] The utility model provides a graphite sealing structure with a blade vein type dynamic pressure groove, which has a simple structure. By arranging a circumferential unloading groove, an axial unloading groove and a blade vein type dynamic pressure groove on the graphite sealing ring petal, the dynamic pressure lubrication of the graphite sealing fluid can be enhanced, the wear of the sealing structure can be reduced, and the service life of the sealing structure can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described in detail below with reference to the accompanying drawings and implementation modes:

[0016] Figure 1 An axial cross-sectional view of a ring-petal type floating ring seal with a circumferentially converging wedge-shaped micro-texture provided by the utility model;

[0017] Figure 2 This is the inner circumference development diagram of the graphite sealing ring;

[0018] Figure 3 for Figure 2 A partial enlarged view of . DETAILED DESCRIPTION

[0019] The present invention will be further explained below in conjunction with specific implementation schemes, but the present invention is not limited thereto.

[0020] like Figures 1 to 3As shown, the utility model provides a graphite sealing structure with a blade vein type dynamic pressure groove, comprising: a sealing seat 1, a graphite sealing ring petal 2 and a circumferential spring 3, wherein the graphite sealing ring petal 2 is multiple, the multiple graphite sealing ring petals 2 are arranged in the sealing seat 1 and are tightly sealed to the outside of the rotor 10 by the circumferential spring 3, and the inner circumferential surface of the graphite sealing ring petal 2 is provided with a circumferential unloading groove 21, an axial unloading groove 22 and a blade vein type dynamic pressure groove 23, the axial unloading groove 22 is multiple and is arranged at intervals along the circumference of the graphite sealing ring petal 2, and one end of the axial unloading groove 22 is connected to the high pressure The inlet side is connected, and the other end is connected to the circumferential unloading groove 21. The blade vein type dynamic pressure groove 23 is multiple and is arranged at intervals along the circumference of the graphite sealing ring petal 2. The blade vein type dynamic pressure groove 23 includes a main vein groove 231, a first side vein groove 232 and a second side vein groove 233. One end of the main vein groove 231 is vertically connected to the axial unloading groove 22. The first side vein groove 232 and the second side vein groove 233 are both multiple and are respectively connected to the two sides of the main vein groove 231 at intervals. The first side vein groove 232 and the second side vein groove 233 are both inclined toward the rotation direction of the rotor 10.

[0021] The graphite sealing structure with a blade vein type dynamic pressure groove is provided with a circumferential unloading groove, an axial unloading groove and a blade vein type dynamic pressure groove on the graphite sealing ring. The blade vein type dynamic pressure groove can significantly increase the number of areas that can generate fluid dynamic pressure effect compared with other groove types, and improve the utilization rate of the dynamic pressure groove. When the rotor rotates, the axial unloading groove plays a drainage role, so that the high-pressure side medium flows into the seal and enters the circumferential unloading groove and the blade vein type dynamic pressure groove respectively. The medium entering the circumferential unloading groove can reduce the unbalanced pressure load and prevent the graphite sealing ring from being aggravated by the inclination. The gas entering the blade vein type dynamic pressure groove from the axial unloading groove first flows into the main groove, and then is divided into each first side groove and the second side groove through the main groove. Each side groove can generate a dynamic pressure effect, thereby significantly enhancing the circumferential fluid dynamic pressure effect of the sealing structure, making the graphite sealing ring float, reducing the wear degree of the sealing ring under low speed conditions, and extending the service life of the sealing structure.

[0022] As an improvement of the technical solution, Figure 3 As shown, the circumferential unloading groove 21 is close to the low-pressure side of the graphite sealing ring petal 2.

[0023] As an improvement of the technical solution, Figure 3 As shown, the first side groove 232 and the second side groove 233 have the same included angle with the main groove 231 and the included angle is 30° to 60°.

[0024] As an improvement of the technical solution, Figure 3 As shown, the spacing between adjacent first side grooves 232 and adjacent second side grooves 233 is equal, and preferably, the spacing is between 1 and 3 mm.

[0025] As an improvement of the technical solution, Figure 3 As shown, the first side grooves 232 and the second side grooves 233 are alternately arranged on both sides of the main groove 231 .

[0026] As an improvement of the technical solution, the first side vein groove 232 and the second side vein groove 233 have the same size, preferably, a length between 2.0 and 2.3 mm, a width between 0.7 and 1 mm, and a depth between 10 and 20 μm.

[0027] As an improvement of the technical solution, the depths of the first side vein groove 232 and the second side vein groove 233 are gradually reduced or stepped along the rotation direction of the rotor 10. This design can further enhance the fluid dynamic pressure effect and increase the depth of the dynamic pressure groove, thereby solving the problem of failure of the dynamic pressure groove due to being worn out.

[0028] As an improvement of the technical solution, Figure 2 As shown, overlapping grooves and overlapping joints are correspondingly provided at both ends of the graphite sealing ring petal 2.

[0029] As an improvement of the technical solution, Figure 1 As shown, the high-pressure inlet end face of the graphite sealing ring petal 2 is provided with an axial spring accommodating groove 24, and an axial compression spring 4 is installed in the axial spring accommodating groove 24. The axial compression spring 4 abuts against a fixed baffle 5 and presses the graphite sealing ring petal 2 onto the sealing seat 1 through an elastic retaining ring 6 that cooperates with the baffle 5.

[0030] The specific implementation methods of the present utility model are written in a progressive manner, emphasizing the differences between the various implementation methods, and the similar parts thereof can be referenced to each other.

[0031] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A graphite sealing structure with a blade vein type dynamic pressure groove, characterized in that: include: A sealing seat (1), a graphite sealing ring flap (2) and a circumferential spring (3), wherein the graphite sealing ring flap (2) is in plurality, the plurality of graphite sealing ring flaps (2) are arranged in the sealing seat (1) and are clamped and sealed to the outer side of a rotor (10) by the circumferential spring (3), the inner circumferential surface of the graphite sealing ring flap (2) is provided with a circumferential unloading groove (21), an axial unloading groove (22) and a blade vein type dynamic pressure groove (23), the axial unloading groove (22) is in plurality and is arranged at intervals along the circumference of the graphite sealing ring flap (2), one end of the axial unloading groove (22) is connected to the high pressure inlet side, and the other end is connected to the circumferential unloading groove (23). The blade vein type dynamic pressure groove (23) is connected with the axial unloading groove (21), the blade vein type dynamic pressure groove (23) is multiple and is arranged at intervals along the circumference of the graphite sealing ring petal (2), the blade vein type dynamic pressure groove (23) includes a main vein groove (231), a first side vein groove (232) and a second side vein groove (233), one end of the main vein groove (231) is vertically connected with the axial unloading groove (22), the first side vein groove (232) and the second side vein groove (233) are multiple and are respectively connected to the two sides of the main vein groove (231), and the first side vein groove (232) and the second side vein groove (233) are both inclined toward the rotation direction of the rotor (10).

2. The graphite sealing structure with blade vein type dynamic pressure groove according to claim 1, characterized in that: The circumferential unloading groove (21) is close to the low-pressure side of the graphite sealing ring flap (2).

3. The graphite sealing structure with blade vein type dynamic pressure groove according to claim 2, characterized in that: The first side vein groove (232) and the second side vein groove (233) have the same included angle as the main vein groove (231), and the included angle is 30° to 60°.

4. The graphite sealing structure with blade vein type dynamic pressure groove according to claim 2, characterized in that: The spacing between adjacent first side vein grooves (232) and adjacent second side vein grooves (233) is equal.

5. The graphite sealing structure with blade vein type dynamic pressure groove according to claim 1, characterized in that: The first side vein grooves (232) and the second side vein grooves (233) are arranged alternately on both sides of the main vein groove (231).

6. The graphite sealing structure with blade vein type dynamic pressure groove according to claim 1, characterized in that: The first side vein groove (232) and the second side vein groove (233) have the same size.

7. The graphite sealing structure with blade vein type dynamic pressure groove according to claim 1, characterized in that: The depths of the first side vein groove (232) and the second side vein groove (233) are gradually reduced or step-wise reduced along the rotation direction of the rotor (10).

8. The graphite sealing structure with blade vein type dynamic pressure groove according to claim 1, characterized in that: Both ends of the graphite sealing ring petal (2) are correspondingly provided with overlapping grooves and overlapping joints.

9. The graphite sealing structure with blade vein type dynamic pressure groove according to claim 1, characterized in that: An axial spring receiving groove (24) is provided on the high-pressure inlet end face of the graphite sealing ring flap (2), an axial compression spring (4) is installed in the axial spring receiving groove (24), the axial compression spring (4) abuts against a fixed baffle (5) and presses the graphite sealing ring flap (2) onto the sealing seat (1) via an elastic retaining ring (6) that cooperates with the baffle (5).

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