阅读说明：本技术 一种带引气槽的石墨密封壳体及装置 (Graphite sealing shell with air guide groove and graphite sealing device ) 是由 曹逸韬 吴悠 苏志敏 周琳 于 2021-09-10 设计创作，主要内容包括：本发明公开了一种带引气槽的石墨密封壳体及装置,其中壳体包括：引气挡板,为环形,引气挡板通过多个筋条与第一环形密封部固定连接；其中,引气挡板与第一环形密封部、多个筋条形成多个引气槽,引气槽的引导面设置在引气挡板的内侧,引导面的横截面包括直线段和弧形引导段,直线段靠近第一环形密封部一侧设置,直线段末端与弧形引导段连接；第二环形密封部,第二环形密封部一端与第一环形密封部连接,第二环形密封部另一端与第三环形密封部连接；其中,第三环形密封部内侧周向设置有环形限位槽。本发明结构实用,简单紧凑,易于加工,装配性好,易于检查维护；并且有效将泄漏的高温封严气引导至轴承外的区域,提高轴承使用寿命。(The invention discloses a graphite sealing shell with an air guide groove and a device, wherein the shell comprises: the air entraining baffle is annular and is fixedly connected with the first annular sealing part through a plurality of ribs; the air guide baffle, the first annular sealing part and the plurality of ribs form a plurality of air guide grooves, a guide surface of each air guide groove is arranged on the inner side of the air guide baffle, the cross section of the guide surface comprises a straight line section and an arc-shaped guide section, the straight line section is arranged on one side close to the first annular sealing part, and the tail end of the straight line section is connected with the arc-shaped guide section; one end of the second annular sealing part is connected with the first annular sealing part, and the other end of the second annular sealing part is connected with the third annular sealing part; wherein, the inboard circumference of third annular seal portion is provided with annular spacing groove. The invention has the advantages of practical structure, simplicity, compactness, easy processing, good assembly and easy inspection and maintenance; and effectively guide the high temperature of leaking to the region outside the bearing, improve bearing life.)

1. A graphite seal housing with an air entrainment channel, comprising:

the air entraining baffle (1) is annular, and the air entraining baffle (1) is fixedly connected with the first annular sealing part (3) through a plurality of ribs (2);

the air guide baffle (1), the first annular sealing part (3) and the ribs (2) form a plurality of air guide grooves (7), a guide surface of each air guide groove (7) is arranged on the inner side of the air guide baffle (1), the cross section of each guide surface comprises a straight line section (101) and an arc-shaped guide section (102), the straight line section (101) is arranged close to one side of the first annular sealing part (3), and the tail end of the straight line section (101) is connected with the arc-shaped guide section (102);

a second annular sealing part (4), wherein one end of the second annular sealing part (4) is connected with the first annular sealing part (3), and the other end of the second annular sealing part (4) is connected with a third annular sealing part (5);

and an annular limiting groove (501) is circumferentially arranged on the inner side of the third annular sealing part (5).

2. Graphite seal housing with air entrainment channel according to claim 1, characterized in that the air entrainment baffle (1), the first annular seal (3), the second annular seal (4) and the third annular seal (5) are arranged concentrically.

3. The graphite seal housing with the air guide groove as claimed in claim 2, wherein a first annular notch (301) is circumferentially formed in the lower left side end face of the first annular seal portion (3), a plurality of ribs (2) are uniformly arranged along the circumferential direction of the air guide baffle (1), one end of each rib (2) is connected with the air guide baffle (1), and the other end of each rib (2) is fixed in the first annular notch (301).

4. The graphite seal housing with the gas guiding groove as recited in claim 2, wherein the inner diameter of the first annular seal portion (3) is smaller than the inner diameter of the second annular seal portion (4), and the right side surface of the first annular seal portion (3) and the inner end surface of the second annular seal portion (4) form a limit step surface.

5. The graphite seal housing with the air guide groove according to claim 3, characterized in that the ribs (2) are arc-shaped plates, the upper end surfaces of the air guide baffle plates (1) are flush with the upper end surfaces of the ribs (2), and the inner diameter of the air guide baffle plates (1) is smaller than that of the first annular seal portion (3).

6. The graphite seal housing with gas introduction groove according to claim 2, characterized in that the third annular seal portion (5) has the same inner diameter as the second annular seal portion (4), and the third annular seal portion (5) has a larger outer diameter than the second annular seal portion (4).

7. The graphite seal housing with the gas guiding groove as claimed in any one of claims 1 to 6, wherein a first relief groove (302) is provided at the junction of the right side surface of the first annular seal portion (3) and the inner end surface of the second annular seal portion (4); and a second tool withdrawal groove (401) is formed at the joint of the third annular sealing part (5) and the outer end face of the second annular sealing part (4).

8. The graphite seal housing with the air guide groove as claimed in any one of claims 1 to 6, wherein a plurality of axial limit blocks (6) are uniformly distributed on the right side of the third annular seal part (5) in the circumferential direction.

9. The graphite sealing shell with the air guide groove as claimed in claim 8, wherein the axial limiting block (6) comprises a bent part (601) and a transverse part (602), one end of the bent part (601) is connected with the right side of the third annular sealing part (5), and the other end of the bent part (601) is connected with the transverse part (602).

10. A graphite sealing device with an air guide groove, which is characterized by comprising the shell as claimed in any one of the claims 1 to 9, and further comprising a graphite ring outer ring (8), a graphite ring (9), a gasket (10), a wave spring (11) and a retainer ring (12);

the graphite ring outer ring (8) is sleeved on the graphite ring (9), the graphite ring (9) is arranged between the first annular sealing part (3) and the gasket (10), the wave spring (11) is arranged between the gasket (10) and the retainer ring (12), and the upper end face of the retainer ring (12) is clamped in the annular limiting groove (501).

11. The graphite sealing device with the gas guiding groove as recited in claim 10, wherein the width of the annular limiting groove (501) is larger than the thickness of the retainer ring (12).

12. The graphite sealing device with the gas guiding groove as recited in claim 10, characterized in that the graphite ring (9) and the graphite ring outer ring (8) are rectangular in cross section, and the cross sectional area of the graphite ring outer ring (8) is smaller than that of the graphite ring (9).

13. The graphite sealing device with the gas guiding groove as recited in claim 12, characterized in that the lower end of the left side of the graphite ring (9) is provided with a second annular notch (901) along the circumference.

14. The graphite sealing device with the gas guide groove as claimed in claim 12, wherein the inner end face of the graphite ring outer ring (8) is circumferentially provided with a rectangular ring groove (801).

15. The graphite sealing device with the gas guiding groove as recited in claim 10, characterized in that the graphite ring outer ring (8) is spaced from the inner end face of the second annular sealing part (4).

Technical Field

The invention belongs to the technical field of sealing dynamics, and particularly relates to a graphite sealing shell with an air guide groove and a device.

Background

The graphite seal is a non-contact seal, has the advantages of good sealing performance, long service life, low friction power consumption and the like, and is often used under the working conditions of high speed and high pressure difference. The modern aeroengine design has widely used the technology to seal the bearing cavity, however, the gaps of the existing non-contact sealing structure have the condition of aligning with the bearing, which causes the leakage of high-temperature and high-pressure sealing gas from the gaps, if no blocking structure is added, the sealing gas is directly sprayed on the bearing outer ring, the end face of the retainer or the rolling body, which causes the temperature rise of the bearing and influences the safety of the engine.

In the prior art, under most conditions, leakage sealing gas is blocked by structures such as oil accumulation rings, oil throwers and the like in front of and behind a bearing inner ring, and direct injection is avoided.

In the prior art, leakage sealing gas is blocked by arranging a baffle structure between the sealing device and the bearing, as shown in fig. 1, an L-shaped oil collecting ring baffle is arranged between the sealing device and the bearing, and the L-shaped oil collecting ring baffle blocks the leakage sealing gas from being directly sprayed onto the bearing.

The graphite sealing device in the prior art has a single structural function and only provides mounting and limiting effects for the graphite ring. Because the structure of the bearing cavity of the aeroengine is complex and compact, when the structure of high-temperature and high-pressure sealing gas for blocking leakage cannot be arranged on a rotor part, the condition of overhigh bearing temperature can be caused.

Normally, the temperature of the sealing gas is far higher than the limit service temperature of the bearing, so that the high-temperature and high-pressure sealing gas which is leaked from the sealing gap needs to be prevented from being directly sprayed on the end face of the bearing. However, as the structure of the bearing cavity of the aero-engine is complex and compact, the situation that the oil thrower or the oil thrower cannot be arranged in the front and the back of the bearing inner ring and the oil collecting ring baffle cannot shield and seal air exists in the design of the engine. This causes the leaked high-temperature and high-pressure gas to be directly sprayed on the bearing, resulting in an increase in the temperature of the bearing, which affects safety.

Disclosure of Invention

Aiming at the problems, the invention provides a graphite sealing shell with an air guide groove and a device, which solve the problem that the temperature of a bearing is increased because sealing gas leaked from a gap of a graphite sealing device of an aeroengine and a gas turbine is directly sprayed on the bearing.

A graphite seal housing with an air entrainment channel, comprising: the air entraining baffle is annular and is fixedly connected with the first annular sealing part through a plurality of ribs;

the air guide baffle, the first annular sealing part and the plurality of ribs form a plurality of air guide grooves, a guide surface of each air guide groove is arranged on the inner side of the air guide baffle, the cross section of the guide surface comprises a straight line section and an arc-shaped guide section, the straight line section is arranged on one side close to the first annular sealing part, and the tail end of the straight line section is connected with the arc-shaped guide section;

one end of the second annular sealing part is connected with the first annular sealing part, and the other end of the second annular sealing part is connected with the third annular sealing part;

wherein, the inboard circumference of third annular seal portion is provided with annular spacing groove.

Further, the bleed air baffle, the first annular seal portion, the second annular seal portion and the third annular seal portion are concentrically arranged.

Furthermore, a first annular notch is formed in the circumferential direction of the end face of the lower left side of the first annular sealing portion, a plurality of ribs are evenly arranged along the circumferential direction of the air entraining baffle, one end of each rib is connected with the air entraining baffle, and the other end of each rib is fixed in the corresponding first annular notch.

Furthermore, the inner diameter of the first annular sealing part is smaller than that of the second annular sealing part, and the right side surface of the first annular sealing part and the inner end surface of the second annular sealing part form a limiting step surface.

Furthermore, the rib is the arc, and bleed baffle's up end and rib up end parallel and level, the internal diameter of bleed baffle is less than the internal diameter of first annular seal portion.

Further, the third annular sealing portion inner diameter is the same as the second annular sealing portion inner diameter, and the third annular sealing portion outer diameter is larger than the second annular sealing portion outer diameter.

Furthermore, a first tool withdrawal groove is formed at the joint of the right side surface of the first annular sealing part and the inner end surface of the second annular sealing part; and a second tool withdrawal groove is formed at the joint of the third annular sealing part and the outer end face of the second annular sealing part.

Furthermore, a plurality of axial limiting blocks are circumferentially and uniformly distributed on the right side of the third annular sealing part.

Further, the axial limiting block comprises a bending part and a transverse part, one end of the bending part is connected with the right side of the third annular sealing part, and the other end of the bending part is connected with the transverse part.

The invention also provides a graphite sealing device with an air guide groove, which comprises the shell, a graphite ring outer ring, a graphite ring, a gasket, a wave spring and a check ring;

the graphite ring outer ring is sleeved on the graphite ring, the graphite ring is arranged between the first annular sealing portion and the gasket, the wave spring is arranged between the gasket and the check ring, and the upper end face of the check ring is clamped in the annular limiting groove.

Furthermore, the width of the annular limiting groove is larger than the thickness of the check ring.

Furthermore, the cross sections of the graphite ring and the outer ring of the graphite ring are rectangular, and the area of the cross section of the outer ring of the graphite ring is smaller than that of the cross section of the graphite ring.

Furthermore, the lower end of the left side of the graphite ring is provided with a second annular notch along the circumferential direction.

Furthermore, a rectangular ring groove is formed in the circumferential direction of the inner end face of the outer ring of the graphite ring.

Furthermore, a gap is reserved between the outer ring of the graphite ring and the inner end face of the second annular sealing part.

The invention has the beneficial effects that: the invention has the advantages of practical structure, simplicity, compactness, easy processing, good assembly and easy inspection and maintenance; and the leaked high-temperature sealing gas can be effectively guided to the region outside the bearing, the temperature of the bearing is reduced, and the service life of the bearing is prolonged.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Figure 1 shows a baffle structure between a graphite seal and a bearing according to the prior art;

FIG. 2 is a schematic diagram of a graphite sealed housing with an air induction groove according to an embodiment of the invention;

FIG. 3 is a partial schematic diagram of a graphite sealed housing with an air induction groove according to an embodiment of the invention;

FIG. 4 is a schematic diagram showing the structure of a graphite sealing device with an air guide groove according to an embodiment of the invention;

FIG. 5 shows a schematic view of a graphite ring installation of a graphite seal with an air entrainment channel in accordance with an embodiment of the present invention;

fig. 6 shows a schematic view of the installation of a graphite sealing device with an air guide groove according to an embodiment of the present invention.

In the figure: 1. a bleed air baffle; 2. ribs; 3. a first annular seal portion; 4. a second annular seal portion; 5. a third annular seal portion; 6. an axial limiting block; 7. an air introducing groove; 8. an outer ring of the graphite ring; 9. a graphite ring; 10. a gasket; 11. a wave spring; 12. a retainer ring; 13. an angle α; 14. sealing the runway with graphite; 15. a bearing; 16. an L-shaped oil collecting ring baffle; 101. a straight line segment; 102. an arc-shaped guide section; 301. a first annular notch; 302. a first tool withdrawal groove; 401. a second tool withdrawal groove; 501. an annular limiting groove; 601. a bending section; 602. a transverse portion; 801. a rectangular ring groove; 901. a second annular notch.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the directional terms "upper, lower, left and right" used in the embodiments of the present invention are generally directed to the directions shown in the drawings; likewise, "inner and outer" refer to inner and outer relative to the profile of the components themselves for ease of understanding and description. The terms "first", "second" and "third" are used for descriptive purposes only.

The invention aims to solve the problem that the temperature of a bearing 15 is increased because sealing gas leaked from a gap of a graphite sealing device of an aeroengine and a gas turbine is directly sprayed on the bearing 15. The invention reduces the temperature load borne by the bearing 15, prolongs the service life of the bearing 15 and ensures the safety of the aeroengine and the gas turbine.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a graphite sealed housing with an air guide groove according to an embodiment of the invention.

The embodiment of the invention provides a graphite sealing shell with an air guide groove, which comprises an air guide baffle plate 1, ribs 2, a first annular sealing part 3, a second annular sealing part 4, a third annular sealing part 5 and an axial limiting block 6.

Bleed baffle 1 is the annular, bleed baffle 1 through a plurality of ribs 2 and first annular sealing portion 3 fixed connection.

In particular, the bleed air baffle 1, the first annular seal 3, the second annular seal 4 and the third annular seal 5 are arranged concentrically.

Specifically, 3 left downside terminal surface circumference of first annular seal portion is equipped with first annular notch 301, and rib 2 evenly sets up a plurality ofly along bleed baffle 1 circumference, and 2 one ends of rib are connected with bleed baffle 1, and the 2 other ends of rib are fixed in first annular notch 301 of first annular seal portion 3.

Bleed baffle 1 is used for preventing that the gas that seals from spouting to bearing 15, and rib 2 is used for fixing bleed baffle 1 on first annular seal portion 3.

Specifically, rib 2 is the arc, and bleed baffle 1's up end and rib 2 up end parallel and level, and bleed baffle 1's internal diameter is less than the internal diameter of first annular seal portion 3.

The air guide baffle plate 1, the first annular sealing part 3 and the plurality of ribs 2 form a plurality of air guide grooves 7, and the air guide grooves 7 are used for guiding sealing air leaked into the bearing cavity.

Referring to fig. 3, fig. 3 is a partial structural schematic diagram of a graphite sealing shell with an air guiding groove according to an embodiment of the invention.

Specifically, the guide surface setting of bleed groove 7 is in bleed baffle 1's inboard, and the cross section of guide surface includes straightway 101 and arc guide section 102, and straightway 101 is close to first annular seal portion 3 one side and sets up, and straightway 101 bottom and the clearance bottom parallel and level of obturating, and straightway 101 is terminal to be connected with arc guide section 102.

The outlet of the arc-shaped guide section 102 is arranged according to the position of the bearing 15, and the extension line of the outlet tangent does not intersect with the bearing 15.

It should be noted that the extension line of the outlet tangent of the arc-shaped guide section 102 does not intersect with the bearing 15, so as to seal the outlet of the gas passing through the gas guiding groove 7 from the area where the bearing 15 is located.

Referring to fig. 6, fig. 6 is a schematic view illustrating an installation of a graphite sealing device with a gas introduction groove according to an embodiment of the present invention.

In specific implementation, the outlet tangent extension of the arc-shaped guide section 102 can be ensured not to intersect with the bearing 15 by setting the angle α 13 between the outlet tangent extension and the outer side surface of the bleed air baffle 1.

Further, the outlet end of the arc-shaped guiding section 102 is provided with a fillet, and the fillet can be used for reducing stress concentration and enhancing the strength of the arc-shaped guiding section 102.

One end of the second annular sealing portion 4 is connected to the first annular sealing portion 3, and the other end of the second annular sealing portion 4 is connected to the third annular sealing portion 5.

The inner diameter of the first annular sealing part 3 is smaller than that of the second annular sealing part 4, and the right side surface of the first annular sealing part 3 and the inner end surface of the second annular sealing part 4 form a limiting step surface.

Furthermore, a first tool withdrawal groove 302 is formed in the joint of the right side face of the first annular sealing portion 3 and the inner end face of the second annular sealing portion 4, manufacturing manufacturability is guaranteed, machining is facilitated, and part machining precision is guaranteed.

Preferably, the left outer end face of the first annular sealing portion 3 is provided with a chamfer, and subsequent installation of the shell is facilitated through the chamfer of the outer end face of the first annular sealing portion 3.

An annular limiting groove 501 is circumferentially arranged on the inner side of the third annular sealing part 5, and the annular limiting groove 501 is used for limiting the subsequent installation of the retainer ring 12.

Illustratively, the annular retaining groove 501 is rectangular in cross-section.

The third annular seal portion 5 has an inner diameter equal to the inner diameter of the second annular seal portion 4, and the third annular seal portion 5 has an outer diameter larger than the outer diameter of the second annular seal portion 4.

The reason why the outer diameter of the third annular seal portion 5 is larger than the outer diameter of the second annular seal portion 4 is to ensure the connection strength between the third annular seal portion 5 and the second annular seal portion 4 after the annular stopper groove 501 is formed inside the third annular seal portion 5.

Further, a second tool withdrawal groove 401 is formed in the joint of the outer end face of the third annular sealing portion 5 and the outer end face of the second annular sealing portion 4, and the second tool withdrawal groove 401 is formed in the joint of the third annular sealing portion 5 and the second annular sealing portion 4, so that manufacturing manufacturability is guaranteed, machining is facilitated, and part machining precision is guaranteed.

A plurality of axial limiting blocks 6 are circumferentially and uniformly distributed on the right side of the third annular sealing portion 5, each axial limiting block 6 comprises a bending portion 601 and a transverse portion 602, one end of each bending portion 601 is connected with the right side of the third annular sealing portion 5, and the other end of each bending portion 601 is connected with the transverse portion 602.

It should be noted that, the outer side of the transverse portion 602 of the axial limiting block 6 is a finish machining plane, which is used for forming axial limiting with the end surfaces of other components during subsequent installation of the housing, and preventing the housing from coming off.

The shell of the embodiment of the invention has the advantages of strong practicability, simple and compact structure, high reliability, easy processing, good assembly and easy inspection and maintenance.

The shell of the embodiment of the invention not only provides the mounting and limiting functions for the graphite ring 9, but also can effectively guide the leaked high-temperature sealing gas to the region outside the bearing 15, and reduce the temperature of the bearing 15.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a graphite sealing device with a gas introduction groove according to an embodiment of the invention.

The embodiment of the invention also provides a graphite sealing device with an air guide groove, which comprises the shell, and further comprises a graphite ring outer ring 8, a graphite ring 9, a gasket 10, a wave spring 11 and a retainer ring 12.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating installation of a graphite ring of a graphite sealing device with an air guide groove according to an embodiment of the present invention.

Graphite ring outer lane 8 suit is on graphite ring 9, and graphite ring 9 sets up between first annular sealing 3 and packing ring 10, and wave spring 11 sets up between packing ring 10 and retaining ring 12, and the up end card dress of retaining ring 12 is in annular spacing groove 501.

During specific implementation, the graphite ring outer ring 8 is sleeved on the graphite ring 9, the graphite ring 9 is placed on a limiting step surface formed by the right side surface of the first annular sealing portion 3 and the inner end surface of the second annular sealing portion 4, then the gasket 10 and the wave spring 11 are sequentially installed on the right side of the graphite ring 9, finally the lower end of the retainer ring 12 is abutted against the wave spring 11, and the upper end of the retainer ring 12 is clamped in the annular limiting groove 501, so that the sealing device is assembled.

The left side of the graphite ring 9 is contacted with the right side surface of the first annular sealing part 3 to form a sealing surface, so that axial sealing is realized; the limiting step surface and the retainer ring 12 act together to limit the graphite ring 9 axially.

Two annular gaskets 10 and a retainer ring 12 are respectively arranged at two ends of the wave spring 11 in a cushioning manner, so that the elastic force of the wave spring 11 cannot directly act on the positioning surface of the graphite ring 9, and the structure of the graphite ring 9 is prevented from being extruded or damaged.

Because the wave spring 11 is of an integral structure, the elastic force provided by the wave spring is uniform, the structure is compact, the required installation space is small, the vibration and the axial movement of the graphite ring 9 can be reduced, the working noise is reduced, and the service life of the graphite sealing device is prolonged.

Further, the width of the annular limiting groove 501 is larger than the thickness of the retainer ring 12, and the retainer ring 12 can axially move in the annular limiting groove 501.

The width of the annular limiting groove 501 is larger than the thickness of the retainer ring 12, so that the retainer ring 12 can be conveniently mounted and dismounted.

The wave spring 11 can limit the axial displacement of the graphite ring 9, and simultaneously, the left side surface of the graphite ring 9 can always contact the right side surface of the first annular sealing part 3 of the shell through elastic force to form sealing through the elastic positioning effect of the wave spring 11.

8 suits of graphite ring outer lane are on graphite ring 9, the graphite ring outer lane 8 leaves the clearance with the 4 interior terminal surfaces of second annular seal portion, allow graphite ring 9 to produce radial floating, the size in clearance is set for according to the right flank area of contact of graphite ring 9 with first annular seal portion 3, when 8 outer terminal surfaces of graphite ring outer lane support the interior terminal surface of second annular seal portion 4, graphite ring 9 left side still with the right flank contact seal of first annular seal portion 3, satisfy the location and the sealed requirement of graphite ring 9.

Specifically, the cross sections of the graphite ring 9 and the graphite ring outer ring 8 are rectangular, and the cross section area of the graphite ring outer ring 8 is smaller than that of the graphite ring 9.

Further, the inner end face and the outer end face of the graphite ring 9 and the graphite ring outer ring 8 are provided with chamfers, and burrs of the inner end face and the outer end face of the graphite ring 9 and the graphite ring outer ring 8 are removed through the chamfers, so that the sealing effect is not influenced by the burrs. Meanwhile, the chamfers on the outer end faces of the graphite ring 9 and the graphite ring outer ring 8 are convenient to install and guide, so that the assembly is easier.

Further, 9 left sides lower extremes of graphite ring are opened circumference and are equipped with second annular notch 901, and second annular notch 901 is the characteristic notch, prevents that graphite ring 9 from adorning in reverse, plays the mistake proofing effect, guarantees assembly quality.

Further, a rectangular ring groove 801 is circumferentially formed in the inner end face of the graphite ring outer ring 8.

It should be noted that, the graphite ring outer ring 8 and the graphite ring 9 are in interference fit, and under the condition that the sealing effect between the inner end face of the graphite ring outer ring 8 and the outer end face of the graphite ring 9 is ensured, the rectangular ring groove 801 is circumferentially formed in the inner end face of the graphite ring outer ring 8, so that the contact area between the inner end face of the graphite ring outer ring 8 and the outer end face of the graphite ring 9 is reduced, the installation is convenient, and the installation efficiency is improved.

When the sealing device of this embodiment uses, the high temperature high pressure that leaks seals gas from the clearance department of sealing between sealing device and the graphite runway 14 that seals, get into bleed baffle 1 and first annular sealing portion 3, in a plurality of bleed grooves 7 that a plurality of ribs 2 formed, high temperature high pressure seals gas and is guided to the region outside bearing 15 through the guide face in bleed groove 7, reduce bearing 15 temperature, the life of bearing 15 has been prolonged, guarantee aeroengine, gas turbine safety.

According to the sealing device provided by the embodiment of the invention, the L-shaped oil collecting ring baffle 16 shown in figure 1 does not need to be arranged between the sealing device and the bearing, so that the structural design requirement of the bearing cavity of the aeroengine is met.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.