Graphite sealing structure for inhibiting lubricating oil leakage

Abstract

The utility model discloses a graphite sealing structure for inhibiting lubricating oil leakage, which comprises a sealing seat and a graphite sealing ring, the graphite sealing ring is arranged on the periphery of a rotor and fixed on the sealing seat, the graphite sealing ring comprises a divergent section, and the inner diameter of the divergent section is in a trend of increasing from a high-pressure side to a low-pressure side. According to the graphite sealing structure for restraining lubricating oil leakage, through the gradual expansion design on the graphite sealing ring, lubricating oil leakage can be effectively restrained.

Description

Technical Field

[0001] The utility model relates to the field of graphite seals, and in particular provides a graphite seal structure for suppressing lubricating oil leakage. Background Art

[0002] Graphite sealing technology plays a crucial role in lubricating oil sealing in aircraft engines. Traditional graphite sealing structures face numerous challenges in achieving lubricating oil sealing. Their sealing mechanisms require extremely high levels of sealing surface flatness and stability. However, during actual engine operation, these surfaces are susceptible to wear, deformation, and relative displacement, making them susceptible to oil leakage under pressure.

[0003] Therefore, proposing a new type of graphite sealing structure to suppress lubricating oil leakage 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 for suppressing lubricating oil leakage, so as to solve the problems existing in the traditional graphite sealing structure.

[0005] The technical solution provided by the utility model is: a graphite sealing structure for suppressing lubricating oil leakage, 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 gradually expanding section, and the inner diameter of the gradually expanding section tends to increase from the high-pressure side to the low-pressure side.

[0006] Preferably, the inner diameter of the gradually expanding section increases continuously or stepwise from the high-pressure side to the low-pressure side.

[0007] More preferably, the inclination angle of the inner circumference of the gradually expanding section is 3-10 degrees.

[0008] Further preferably, a plurality of axial bosses are arranged on the inner circumferential surface of the gradually expanding 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 gradually expanding section is the smallest.

[0010] Further preferably, the graphite sealing ring further includes a constant diameter section having the same inner diameter, the constant diameter section being connected to the gradually expanding section and located on the low-pressure side of the gradually expanding 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 graphite sealing structure for suppressing lubricating oil leakage provided by the utility model can effectively suppress lubricating oil leakage through the gradual expansion 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 This is an axial cross-sectional view of a graphite sealing structure for suppressing lubricating oil leakage provided by the present invention;

[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] like Figure 1 、 Figure 2 As shown, the utility model provides a graphite sealing structure for suppressing lubricating oil leakage, comprising: 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 gradually expanding section 21, and the inner diameter of the gradually expanding section 21 tends to increase from the high-pressure side to the low-pressure side.

[0019] The graphite sealing structure for suppressing lubricating oil leakage forms a gradually expanding sealing gap between the graphite sealing ring and the rotor through the gradually expanding design of the graphite sealing ring, which can effectively suppress lubricating oil leakage. The suppression principle is as follows: when the rotor rotates at high speed, a centrifugal field will be generated. In this centrifugal field, the lubricating oil is driven by centrifugal force, and the lubricating oil entering the sealing gap is directionally migrated along the gradually expanding circumferential surface toward the lubricating oil cavity. In this process, the lubricating oil obtains a larger radial migration power due to the action of centrifugal force, and its movement trajectory closely fits the gradually expanding circumferential surface. This can not only reduce the tendency of the lubricating oil to flow in the axial reverse direction in the sealing gap, but also form a continuous oil film with a certain thickness on the surface of the gradually expanding circumferential surface. The existence of this oil film can not only increase the resistance of the lubricating oil to pass through the sealing gap, but also fill the tiny irregularities in the sealing gap to a certain extent, thereby playing a preliminary sealing role. At the same time, compared to lubricating oil, gas is less affected by centrifugal force. Therefore, under the same centrifugal force field environment, gas moves closer to the rotor. As a result, within the sealing gap, gas and lubricating oil form a radially distributed layered structure. Gas gathers in the inner area close to the rotor and forms a relatively dense airflow layer. This airflow layer can effectively block the airflow channel, preventing lubricating oil from leaking to the high-pressure airflow area under the action of pressure difference, and builds a stable isolation barrier between the lubricating oil and the high-pressure airflow. In addition, the structural characteristics of the gradually expanding sealing gap cause the flow path of the lubricating oil to gradually expand under the action of centrifugal force, reducing the flow rate of the lubricating oil and further reducing the dynamic factors of lubricating oil leakage. Through the above-mentioned multi-faceted synergistic mechanism, the graphite sealing structure can effectively suppress lubricating oil leakage, significantly improve the oil sealing performance, and provide a reliable sealing guarantee for the stable operation of related equipment.

[0020] As an improvement to the technical solution, the inner diameter of the gradually expanding section 21 increases continuously or stepwise 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 gradually expanding 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 gradually expanding 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 211 and the rotor 10 is equal to the distance between the rotor 10 and the minimum inner diameter point of the gradually expanding section 21 .

[0024] As an improvement of the technical solution, Figure 1 、 Figure 2As 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 gradually expanding section 21 and is located on the low-pressure side of the gradually expanding 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 point of the gradually expanding 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 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 for inhibiting lubricating oil leakage, 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 gradually expanding section (21), and the inner diameter of the gradually expanding section (21) tends to increase from the high-pressure side to the low-pressure side.

2. The graphite sealing structure for suppressing lubricating oil leakage according to claim 1, characterized in that: The inner diameter of the gradually expanding section (21) increases continuously or stepwise from the high-pressure side to the low-pressure side.

3. The graphite sealing structure for suppressing lubricating oil leakage according to claim 1, characterized in that: The inclination angle of the inner peripheral surface of the gradually expanding section (21) is 3-10 degrees.

4. The graphite sealing structure for suppressing lubricating oil leakage according to claim 1, characterized in that: A plurality of axial bosses (211) are provided on the inner circumferential surface of the gradually expanding section (21) at intervals along the circumference of the graphite sealing ring (2).

5. The graphite sealing structure for suppressing lubricating oil leakage 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 gradually expanding section (21).

6. The graphite sealing structure for suppressing lubricating oil leakage 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 gradually expanding section (21) and being located on the low-pressure side of the gradually expanding section (21), and a circumferential unloading groove (221) being provided on the inner circumferential surface of the constant diameter section (22).

7. The graphite sealing structure for suppressing lubricating oil leakage 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) arranged in sequence.

8. The graphite sealing structure for suppressing lubricating oil leakage 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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