Graphite sealing structure with high sealing performance

Abstract

The utility model discloses a graphite sealing structure with high sealing performance, which comprises a sealing seat and a graphite sealing ring, the graphite sealing ring is arranged on the periphery of a rotor and is fixed on the sealing seat, the graphite sealing ring comprises a gradually-shrinking section, and the inner diameter of the gradually-shrinking section is gradually reduced from a high-pressure side to a low-pressure side. According to the graphite sealing structure with the high sealing performance, through the gradual shrinking design of the graphite sealing ring, the sealing performance of the sealing structure can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of graphite sealing, and in particular provides a graphite sealing structure with high sealing performance. Background Art

[0002] Reliable aircraft engine operation relies on an efficient oil sealing system. While graphite seals are a common method, their traditional structure is gradually revealing its limitations in practical applications. Traditional graphite seals struggle to maintain an ideal seal, and the sealing surface is susceptible to minor defects due to the operating environment. Over time, these defects degrade the seal, increasing the risk of oil leakage and threatening engine operation.

[0003] Therefore, proposing a new type of graphite sealing structure to improve the sealing performance of the graphite sealing structure has become an urgent problem to be solved. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a graphite sealing structure with high sealing performance to solve the problems existing in traditional graphite sealing structures.

[0005] The technical solution provided by the utility model is: a high-sealing graphite sealing structure, comprising: a sealing seat and a graphite sealing ring, wherein the graphite sealing ring is arranged on the outer periphery of the rotor and fixed on the sealing seat, and the graphite sealing ring includes a tapered section, and the inner diameter of the tapered section tends to decrease from the high-pressure side to the low-pressure side.

[0006] Preferably, the inner diameter of the tapered section decreases continuously or in steps from the high-pressure side to the low-pressure side.

[0007] More preferably, the inclination angle of the inner circumferential surface of the tapered section is 3-10 degrees.

[0008] Further preferably, a plurality of axial bosses are arranged on the inner circumferential surface of the tapered section at intervals along the circumferential direction of the graphite sealing ring.

[0009] Further preferably, the distance between the axial boss and the rotor is equal to the distance between the rotor and the point where the inner diameter of the tapered section is the smallest.

[0010] Further preferably, the graphite sealing ring further includes a constant diameter section having equal inner diameters, the constant diameter section being connected to the tapered section and located on the low-pressure side of the tapered section, and a circumferential unloading groove being provided on the inner circumferential surface of the constant diameter section.

[0011] Further preferably, the graphite sealing ring is composed of a plurality of sealing ring petals, which are tightened by circumferential springs and fixed to the sealing seat by sequentially arranged axial compression springs, baffles and clamping rings.

[0012] Further preferably, one end of the sealing ring petal is fixedly connected to the sealing seat via an anti-rotation pin.

[0013] The high-sealing graphite sealing structure provided by the utility model can effectively improve the sealing performance of the sealing structure through the tapered design on the graphite sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0015] Figure 1 An axial cross-sectional view of the high-sealing graphite sealing structure provided by the utility model;

[0016] Figure 2 Schematic diagram of the structure of the sealing ring petal. DETAILED DESCRIPTION

[0017] The present invention will be further explained below in conjunction with specific implementation plans, but the present invention is not limited thereto.

[0018] In order to solve the problems existing in the prior art, such as Figure 1 、 Figure 2 As shown, the utility model provides a high-sealing graphite sealing structure, including: a sealing seat 1 and a graphite sealing ring 2, wherein the graphite sealing ring 2 is arranged on the outer periphery of the rotor 10 and fixed on the sealing seat 1, and the graphite sealing ring 2 includes a tapered section 21, and the inner diameter of the tapered section 21 tends to decrease from the high-pressure side to the low-pressure side.

[0019] This highly tight graphite sealing structure, through the tapered design of the graphite sealing ring, creates a tapered sealing gap between the graphite sealing ring and the rotor. As air flows axially from the high-pressure gas chamber to the lubricating oil chamber, the sealing gap decreases. According to the principles of fluid mechanics, the airflow velocity increases, thereby increasing the gas dynamic pressure. During the sealing process, the impact of the high-speed sealing gas creates a retarding force on the lubricating oil, hindering its axial flow. Simultaneously, the increased gas dynamic pressure promotes the formation of a more stable air film with a certain pressure gradient within the sealing gap. This air film not only effectively fills any tiny gaps that may exist on the sealing surface, but also provides a continuous barrier to the lubricating oil, significantly improving sealing performance. Especially under conditions of low sealing gas pressure, it can effectively complete the lubricating oil sealing task and ensure the stable operation of the aircraft engine.

[0020] The inner diameter of the tapered section 21 decreases continuously or in steps from the high-pressure side to the low-pressure side.

[0021] As an improvement to the technical solution, the inclination angle of the inner circumference of the tapered section 21 is 3-10 degrees.

[0022] As an improvement of the technical solution, Figure 2 As shown, a plurality of axial bosses 211 are provided on the inner circumferential surface of the tapered section 21 at intervals along the circumference of the graphite sealing ring 2 to limit the circumferential rotational velocity of the flow field and improve the sealing performance.

[0023] As an improvement of the technical solution, Figure 2 As shown, the distance between the axial boss 22 and the rotor 10 is equal to the distance between the rotor 10 and the point where the inner diameter of the tapered section 21 is the smallest.

[0024] As an improvement of the technical solution, Figure 1 、 Figure 2 As shown, the graphite sealing ring 2 also includes a constant diameter section 22, the inner diameter of the constant diameter section 22 is equal, the constant diameter section 22 is connected to the tapered section 21 and is located on the low-pressure side of the tapered section 21, and a circumferential unloading groove 221 is provided on the inner circumferential surface of the constant diameter section 22. Preferably, the distance between the constant diameter section and the rotor 10 is equal to the distance between the rotor 10 and the minimum inner diameter of the tapered section 21.

[0025] As an improvement of the technical solution, the graphite sealing ring 2 is composed of multiple sealing ring petals, such as Figure 1 As shown, the sealing ring petal is tightened by the circumferential spring 3 and is pressed and fixed on the sealing seat 1 by the axial compression spring 4, the baffle 5 and the clamping ring 6 which are arranged in sequence.

[0026] As an improvement of the technical solution, Figure 1 As shown, one end of the sealing ring petal is fixedly connected to the sealing seat 1 through an anti-rotation pin 7.

[0027] The specific implementation methods of the present invention are written in a progressive manner, emphasizing the differences between the various implementation methods, and similar parts can be referenced to each other.

[0028] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A graphite sealing structure with high sealing performance, characterized in that: include: A sealing seat (1) and a graphite sealing ring (2), wherein the graphite sealing ring (2) is arranged on the outer periphery of a rotor (10) and fixed on the sealing seat (1), and the graphite sealing ring (2) includes a tapered section (21), and the inner diameter of the tapered section (21) tends to decrease from the high-pressure side to the low-pressure side.

2. The high-sealing graphite sealing structure according to claim 1, characterized in that: The inner diameter of the tapered section (21) decreases continuously or in steps from the high-pressure side to the low-pressure side.

3. The high-sealing graphite sealing structure according to claim 1, characterized in that: The inclination angle of the inner peripheral surface of the tapered section (21) is 3-10 degrees.

4. The high-sealing graphite sealing structure according to claim 1, characterized in that: A plurality of axial bosses (211) are provided on the inner circumferential surface of the tapered section (21) at intervals along the circumference of the graphite sealing ring (2).

5. The high-sealing graphite sealing structure according to claim 4, characterized in that: The distance between the axial boss (211) and the rotor (10) is equal to the distance between the rotor (10) and the minimum inner diameter point of the tapered section (21).

6. The high-sealing graphite sealing structure according to claim 1, characterized in that: The graphite sealing ring (2) further comprises a constant diameter section (22), the inner diameters of the constant diameter section (22) being equal, the constant diameter section (22) being connected to the tapered section (21) and being located on the low-pressure side of the tapered section (21), and a circumferential unloading groove (221) being provided on the inner circumferential surface of the constant diameter section (22).

7. The high-tightness graphite sealing structure according to claim 1, characterized in that: The graphite sealing ring (2) is composed of a plurality of sealing ring petals, which are clamped by a circumferential spring (3) and fixed to the sealing seat (1) by an axial compression spring (4), a baffle (5) and a clamping ring (6) which are arranged in sequence.

8. The high-tightness graphite sealing structure according to claim 7, characterized in that: One end of the sealing ring petal is fixedly connected to the sealing seat (1) via an anti-rotation pin (7).

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