CN112855940A - Graphite circumference seal structure - Google Patents
Graphite circumference seal structure Download PDFInfo
- Publication number
- CN112855940A CN112855940A CN202110187993.8A CN202110187993A CN112855940A CN 112855940 A CN112855940 A CN 112855940A CN 202110187993 A CN202110187993 A CN 202110187993A CN 112855940 A CN112855940 A CN 112855940A
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- CN
- China
- Prior art keywords
- graphite
- rotation
- block
- sealing structure
- circumferential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 97
- 239000010439 graphite Substances 0.000 title claims abstract description 97
- 238000007789 sealing Methods 0.000 claims abstract description 51
- 230000004308 accommodation Effects 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims 5
- 230000002452 interceptive effect Effects 0.000 claims 1
- 238000005299 abrasion Methods 0.000 description 7
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 208000007101 Muscle Cramp Diseases 0.000 description 1
- 238000009414 blockwork Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/26—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings
- F16J15/30—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings with sealing rings made of carbon
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
- Mechanical Sealing (AREA)
Abstract
The application provides a graphite circumference seal structure includes: the sealing device comprises a sealing seat, a runway, a graphite block, a surrounding spring, an anti-rotation pin, an anti-rotation block, an axial elastic element and a clamping ring; wherein, seal receptacle and runway are formed with an accommodation space, and a plurality of graphite blocks splice into whole ring structure and arrange the accommodation space in, have the anti-rotating groove on the graphite block, and the anti-rotating block sets up in the anti-rotating groove to through preventing that the relative fastening of rotating pin is on the mount pad, enclose spring partial pressure at least and hold in a plurality of graphite block radial outside of annular, axial elastic element sets up in a plurality of graphite block axial outside of annular, realize spacing to the axial of a plurality of graphite blocks of annular through the rand. This application has the rotation-proof structure of "self-adaptation" ability for graphite circumference sealing device in the past, and this rotation-proof structure can be according to the graphite ring prevent that the trench position and angular variation angle of adjustment have guaranteed full operating condition's face contact, can effectively alleviate the wearing and tearing of preventing the trench department, improve graphite sealing device's life.
Description
Technical Field
The application belongs to the technical field of aeroengine sealing, and particularly relates to a graphite circumferential sealing structure.
Background
The graphite circumferential seal has good sealing performance, so that the graphite circumferential seal is widely applied to the lubricating oil seal between a rotor and a stator of a main bearing cavity of an aircraft engine.
The graphite circumferential seal is a contact seal structure, and is generally formed by overlapping 3-5 sections of graphite rings 11, as shown in fig. 1 and 2. In order to prevent the graphite ring 11 in the graphite circumferential seal from rotating, the graphite circumferential seal device needs to be designed to prevent rotation. The conventional graphite circumferential sealing structure adopts an anti-rotation pin 12 for preventing rotation. Because the working condition is bad, and the rotation-preventing pin type rotation is prevented into point contact, the abrasion amount of the main sealing surface and the auxiliary sealing surface (working surface) of the graphite ring decomposed during the overhaul of the engine is not large but the abrasion is serious at the rotation-preventing groove, as shown in figure 2. Due to the fact that abrasion at the anti-rotation groove is achieved, the service life of the graphite circumferential sealing device for the aircraft engine is greatly shortened. How to design the graphite circumferential sealing anti-rotation structure to reduce the abrasion between the anti-rotation pin and the graphite ring and improve the service life of the graphite circumferential sealing has no better solution in the previous design.
At present, the circumferential sealing of graphite mostly adopts an anti-rotation pin for preventing rotation, as shown in figure 1. The anti-rotation pin of the anti-rotation structure is in point contact with the graphite ring, and the local stress of the contact point is large. When the rotor of the aircraft engine rotates, the graphite hoop follows the runway under the action of the surrounding spring and generates sliding friction with the anti-rotation pin. Compared with the friction between the graphite ring and the runway, the friction coefficient is higher and the pressure at the position is higher, so that the abrasion at the position is serious, and the service life of the circumferential seal of the graphite is further prolonged. .
Disclosure of Invention
It is an object of the present application to provide a graphite circumferential sealing structure to solve or mitigate at least one problem of the background art.
The technical scheme of the application is as follows: a graphite circumferential seal structure comprising: the sealing device comprises a sealing seat, a runway, a graphite block, a surrounding spring, an anti-rotation pin, an anti-rotation block, an axial elastic element and a clamping ring; wherein, seal receptacle and runway are formed with an accommodation space, and a plurality of graphite blocks splice into whole ring structure and arrange in the accommodation space, the last anti-rotation groove that has of graphite block, prevent changeing the piece set up in prevent changeing the inslot, and pass through prevent changeing the relative fastening of pin and be in on the mount pad, enclose the at least partial pressure of spring and hold in a plurality of graphite block radial outside of annular, axial elastic element sets up in annular a plurality of graphite block axial outside, through the rand realization is spacing to annular a plurality of graphite block's axial.
Furthermore, the anti-rotation pin and the sealing seat are in interference fit.
Furthermore, the number of the anti-rotation grooves on the graphite block is one.
Furthermore, the anti-rotation groove is positioned in the middle of the circumference of the graphite ring.
Furthermore, the anti-rotation groove is in a U-shaped groove with a semicircular bottom and parallel side parts.
Furthermore, the anti-rotation block is of a track circular structure with semicircular ends and parallel side parts, and a pin hole for allowing an anti-rotation pin to pass through is formed in the middle of the anti-rotation block.
Furthermore, the outer surface of the anti-rotation block and the inner side surface of the pin hole are sprayed with wear-resistant coatings.
Further, the height of the graphite ring in the radial direction is higher than half of the height of the anti-rotation block.
Furthermore, the anti-rotation block is provided with a default part facing the front end face of the graphite block, and the default part is used for forming an anti-interference structure which does not interfere with the surrounding spring.
Furthermore, the width of the anti-rotation block is determined according to the linear expansion coefficients of the graphite block and the anti-rotation block, so that in a working state, the width of the anti-rotation block is equal to the width of the anti-rotation groove.
The utility model provides a graphite circumference seal structure has the rotation-proof structure of "self-adaptation" ability for graphite circumference sealing device in the past, and this rotation-proof structure can be according to the rotation-proof groove position and the angle change angle of adjustment of graphite ring, has guaranteed full operating condition's face contact, can effectively alleviate the wearing and tearing of rotation-proof groove department, improves graphite sealing device's life.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.
Fig. 1 is a schematic diagram of a graphite circumferential sealing structure in the prior art.
Fig. 2 is a sectional view of the graphite circumferential sealing structure a-a in fig. 1.
Fig. 3 is a schematic view of the initial position of a pin and graphite in the prior art.
Fig. 4 is a schematic diagram of the worn position of a pin and graphite in the prior art.
Fig. 5 is a schematic view of a graphite circumferential sealing structure of the present application.
FIG. 6 is a schematic view of the anti-rotation block structure of the present application.
Reference numerals
21-a sealing seat;
22-runway;
23-graphite blocks;
24-enclosing a spring;
25-anti-rotation block, 251-upper end, 252-lower end, 253-left end, 254-right end, 255-inner hole surface, 256-default part, 257-rear end surface;
26-anti-rotation pins;
27-an axial elastic element;
28-collar.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.
In order to overcome the problems in the prior art, the graphite circumferential sealing structure with the novel structure is provided, and the graphite circumferential sealing structure is provided with a special anti-rotation structure, so that the graphite circumferential sealing structure can prevent rotation of the graphite circumferential sealing structure, and can reduce the abrasion of the anti-rotation grooves in the graphite block/ring and prolong the service life of the graphite circumferential sealing structure.
As shown in fig. 5, the graphite circumferential sealing structure 20 of the present application mainly includes: sealing seat 21, runway 22, graphite block 23, round spring 24, prevent changeing piece 25, prevent changeing pin 26, axial elastic element 27 and rand 28. An accommodating space is formed between the sealing seat 21 and the runway 22, and a plurality of graphite blocks are spliced into a whole ring structure and are arranged in the accommodating space. Each graphite block 23 is provided with an anti-rotation groove, an anti-rotation block 25 is arranged in the anti-rotation groove, and the anti-rotation block 25 is relatively fastened on the mounting seat 21 through an anti-rotation pin 26. The surrounding spring 24 is at least partially pressed on the radial outer side of the plurality of annular graphite blocks 23 and is used for providing centripetal force for the plurality of annular graphite blocks 23. The axial elastic element 27 is arranged axially outside the plurality of annular graphite blocks 23, and axially limits the plurality of annular graphite blocks 23 by the collar 28. Because the graphite block 23 is before cooperating with runway 22, because of enclosing the spring action of spring 24, the clearance between the lap joint of graphite block 23 can be eaten, and the graphite ring internal diameter can reduce, and this state is graphite ring "cramps" state.
In a preferred embodiment of the present application, the anti-rotation pin 26 is in interference fit with the sealing seat 21 to ensure that the annular graphite blocks 23 maintain sufficient tightness under the whole working condition.
In addition, in the preferred embodiment of the present application, there is only one and only one anti-rotation groove on the graphite block 23, and at the same time, the anti-rotation groove is located approximately in the middle of the circumference of the graphite ring 23, so that the anti-rotation block 25 installed in the anti-rotation groove can rotate along with the rotation, thereby realizing "self-adaptation". The anti-rotation groove is in a U-shaped groove with a semicircular bottom and parallel side parts.
As shown in fig. 6, when viewed from the front (direction B in fig. 5), the upper end 251 and the lower end 252 of the rotation preventing block 25 are two semicircles, the left end 253 and the right end 254 of the middle portion are planes parallel to each other, and the middle portion is a pin hole through which the rotation preventing pin 26 passes. When the anti-rotation graphite block works, the upper semicircle and the lower semicircle of the anti-rotation block 25 are not contacted with the graphite block 23, and the plane parallel to the middle is contacted with the side surface of the U-shaped groove of the graphite ring 23 to form surface friction, so that the abrasion loss is reduced, and the service life of the graphite block 23 is prolonged.
In the preferred embodiment, the outer surface of the anti-rotation block 25 and the inner bore surface 255 of the pin hole are coated with a wear resistant coating to improve the service life of the anti-rotation block 25.
Further, in an embodiment of the present application, a portion of the surrounding spring 24 is pressed on the graphite block 23, a rear end face 257 of the rotation preventing block 25 facing the sealing seat 21 is a plane, a face facing the graphite block 23 is a stepped face, and a radial upper portion of the rotation preventing block 25 has a default 256, so as to ensure that the rotation preventing block 25 does not interfere with the surrounding spring 24 and has a maximum contact area in the entire working state of the graphite sealing structure 20. It is understood that in another embodiment of the present application, when the surrounding spring 24 is pressed on the graphite block 23, the front and rear surfaces of the rotation preventing block 25 can be flat.
In the preferred embodiment of the present application, in order to prevent the anti-rotation structure from being stuck in operation and in the "tightening" state, the length L of the anti-rotation block 25 is reasonably controlled to ensure that the outer diameter of the graphite block 23 for sealing is always higher than the (1/2) L of the anti-rotation block 25 in the full operating condition and in the "tightening" state.
In the preferred embodiment of this application, because of the coefficient of linear expansion of graphite material is less than metal material, should rationally design the width H who prevents changeing piece 2 to guarantee can not cause graphite piece 23 and prevent changeing piece 25 extrusion each other because of the difference of coefficient of linear expansion under full operating mode temperature, lead to unable realization normal function.
In the working process of the graphite circumferential sealing structure 20, the concentricity, the runout tolerance of the runway 22 and the deflection of the rotor caused by the machining and assembling processes are influenced together, so that the sealing runway 22 generates radial displacement along with the high-speed rotation of the rotor of the engine, and the change rate of the displacement is fast. The graphite block 23 is in close contact with the seal running track 22, and is subjected to a rotational friction force and also radially displaced. Because the rotation preventing block 25 can rotate freely around the rotation preventing pin 26, the rotation preventing block 25 can be well adapted to the angle and radial size change of the graphite block 23 to rotate freely, and the surface contact is kept, so that the service life of the graphite block 23 is prolonged.
The utility model provides a graphite circumference seal structure for graphite circumference sealing device in the past has the rotation-proof structure of "self-adaptation" ability, should prevent rotation-proof structure, can guarantee full operating condition's face contact according to the position of graphite ring U-shaped groove and angular variation angle of adjustment, can effectively alleviate the wearing and tearing of rotation-proof groove department, improves graphite sealing device's life.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A graphite circumferential seal structure, comprising: the anti-rotation device comprises a sealing seat (21), a runway (22), a graphite block (23), a surrounding spring (24), an anti-rotation pin (26), an anti-rotation block (25), an axial elastic element (27) and a clamping ring (28); wherein, seal receptacle (21) and runway (22) are formed with an accommodation space, and a plurality of graphite blocks (23) splice into whole ring structure and arrange in the accommodation space, the anti-rotation groove has on graphite block (23), prevent changeing piece (25) set up in prevent changeing the inslot, and pass through prevent changeing round pin (26) relative fastening in on mount pad (21), enclose spring (24) at least partial pressure and hold in the radial outside of a plurality of graphite blocks (23) of annular, axial elastic element (27) set up in annular a plurality of graphite blocks (23) axial outside, through rand (28) realize spacing to the axial of a plurality of graphite blocks of annular (23).
2. The graphite circumferential sealing structure of claim 1, wherein the anti-rotation pin (26) is in interference fit with the sealing seat (21).
3. The graphite circumferential sealing structure of claim 1, wherein the number of the anti-rotation grooves on the graphite block (23) is one.
4. The graphite circumferential sealing structure of claim 3, wherein the anti-rotation groove is located in the circumferential middle of the graphite ring (23).
5. The circumferential graphite sealing structure of claim 3 or 4, wherein the anti-rotation grooves are in the shape of U-shaped grooves with semicircular bottoms and parallel sides.
6. The graphite circumferential sealing structure of claim 5, wherein the anti-rotation block (25) has a track circle structure with semicircular ends and parallel sides, and a pin hole for passing an anti-rotation pin (26) is formed in the middle.
7. The graphite circumferential sealing structure of claim 6, wherein the outer surface of the anti-rotation block (25) and the inner side surface of the pin hole are coated with a wear-resistant coating.
8. The graphite circumferential sealing structure of claim 6, wherein the front end face of the anti-rotation block (25) facing the graphite block (23) has a default portion (256), and the default portion (256) is used for forming an interference prevention structure without interfering with the surrounding spring (24).
9. The graphite circumferential sealing structure of claim 6, wherein the height of the graphite ring (23) in the radial direction is higher than half of the height of the anti-rotation block (25).
10. The graphite circumferential sealing structure of claim 6, wherein the width of the rotation prevention block (25) is determined according to the linear expansion coefficients of the graphite block (23) and the rotation prevention block (25) so that the width of the rotation prevention block (25) is equal to the width of the rotation prevention groove in the working state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110187993.8A CN112855940A (en) | 2021-02-18 | 2021-02-18 | Graphite circumference seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110187993.8A CN112855940A (en) | 2021-02-18 | 2021-02-18 | Graphite circumference seal structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112855940A true CN112855940A (en) | 2021-05-28 |
Family
ID=75988007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110187993.8A Pending CN112855940A (en) | 2021-02-18 | 2021-02-18 | Graphite circumference seal structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112855940A (en) |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1414154A (en) * | 1971-11-15 | 1975-11-19 | Hunger W | Arrangement of complementary machine elements with an adju stable sealing element operative against a pressure medium |
| US5039115A (en) * | 1989-03-08 | 1991-08-13 | Societe Nationale'etude De Et Construction De Moteurs D'aviation | Seal for a rotating shaft |
| CN2765010Y (en) * | 2005-01-27 | 2006-03-15 | 大连华阳光大密封有限公司 | Mechanical sealed driving device |
| US20070013143A1 (en) * | 2005-07-18 | 2007-01-18 | Kalsi Engineering, Inc. | Filled hydrodynamic seal with contact pressure control, anti-rotation means and filler retention means |
| CN101240853A (en) * | 2007-02-06 | 2008-08-13 | 韩宏波 | Sliding positioning angle-shaped joint follow-up seal device |
| US20100072712A1 (en) * | 2008-09-25 | 2010-03-25 | Hoerbiger Kompressortechnik Holding Gmbh | Pressure packing comprised of packing rings secured against rotation with injection-molded segments |
| CN103486076A (en) * | 2013-09-19 | 2014-01-01 | 丹东克隆集团有限责任公司 | Nuclear power charging pump mechanical seal device |
| CN103486270A (en) * | 2013-09-20 | 2014-01-01 | 丹东克隆集团有限责任公司 | Mechanical seal device for nuclear power waste heat removal pump |
| CN103486075A (en) * | 2013-09-19 | 2014-01-01 | 丹东克隆集团有限责任公司 | Static ring component of nuclear power charging pump mechanical seal device |
| CN203516739U (en) * | 2013-09-20 | 2014-04-02 | 丹东克隆集团有限责任公司 | Mechanical sealing device for nuclear power residual heat removal pump |
| CN203516175U (en) * | 2013-09-19 | 2014-04-02 | 丹东克隆集团有限责任公司 | Stationary ring assembly of mechanical sealing device for nuclear power charging pump |
| CN203516176U (en) * | 2013-09-19 | 2014-04-02 | 丹东克隆集团有限责任公司 | Mechanical sealing device for nuclear power charging pump |
| CN205806463U (en) * | 2016-07-21 | 2016-12-14 | 浙江强力重工有限公司 | Seal carbocyclic ring |
| CN207569192U (en) * | 2017-10-31 | 2018-07-03 | 中国航发商用航空发动机有限责任公司 | Circumferential sealing component and engine |
| CN109630280A (en) * | 2018-12-14 | 2019-04-16 | 中国航发沈阳发动机研究所 | Sealing element and sealing device |
| CN112303234A (en) * | 2019-08-02 | 2021-02-02 | 凯登环形密封股份有限公司 | High clearance seal assembly |
-
2021
- 2021-02-18 CN CN202110187993.8A patent/CN112855940A/en active Pending
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1414154A (en) * | 1971-11-15 | 1975-11-19 | Hunger W | Arrangement of complementary machine elements with an adju stable sealing element operative against a pressure medium |
| US5039115A (en) * | 1989-03-08 | 1991-08-13 | Societe Nationale'etude De Et Construction De Moteurs D'aviation | Seal for a rotating shaft |
| CN2765010Y (en) * | 2005-01-27 | 2006-03-15 | 大连华阳光大密封有限公司 | Mechanical sealed driving device |
| US20070013143A1 (en) * | 2005-07-18 | 2007-01-18 | Kalsi Engineering, Inc. | Filled hydrodynamic seal with contact pressure control, anti-rotation means and filler retention means |
| CN101240853A (en) * | 2007-02-06 | 2008-08-13 | 韩宏波 | Sliding positioning angle-shaped joint follow-up seal device |
| US20100072712A1 (en) * | 2008-09-25 | 2010-03-25 | Hoerbiger Kompressortechnik Holding Gmbh | Pressure packing comprised of packing rings secured against rotation with injection-molded segments |
| CN103486075A (en) * | 2013-09-19 | 2014-01-01 | 丹东克隆集团有限责任公司 | Static ring component of nuclear power charging pump mechanical seal device |
| CN103486076A (en) * | 2013-09-19 | 2014-01-01 | 丹东克隆集团有限责任公司 | Nuclear power charging pump mechanical seal device |
| CN203516175U (en) * | 2013-09-19 | 2014-04-02 | 丹东克隆集团有限责任公司 | Stationary ring assembly of mechanical sealing device for nuclear power charging pump |
| CN203516176U (en) * | 2013-09-19 | 2014-04-02 | 丹东克隆集团有限责任公司 | Mechanical sealing device for nuclear power charging pump |
| CN103486270A (en) * | 2013-09-20 | 2014-01-01 | 丹东克隆集团有限责任公司 | Mechanical seal device for nuclear power waste heat removal pump |
| CN203516739U (en) * | 2013-09-20 | 2014-04-02 | 丹东克隆集团有限责任公司 | Mechanical sealing device for nuclear power residual heat removal pump |
| CN205806463U (en) * | 2016-07-21 | 2016-12-14 | 浙江强力重工有限公司 | Seal carbocyclic ring |
| CN207569192U (en) * | 2017-10-31 | 2018-07-03 | 中国航发商用航空发动机有限责任公司 | Circumferential sealing component and engine |
| CN109630280A (en) * | 2018-12-14 | 2019-04-16 | 中国航发沈阳发动机研究所 | Sealing element and sealing device |
| CN112303234A (en) * | 2019-08-02 | 2021-02-02 | 凯登环形密封股份有限公司 | High clearance seal assembly |
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Application publication date: 20210528 |
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