CN112112968A - Combined type non-contact seal structure - Google Patents
Combined type non-contact seal structure Download PDFInfo
- Publication number
- CN112112968A CN112112968A CN202011012145.5A CN202011012145A CN112112968A CN 112112968 A CN112112968 A CN 112112968A CN 202011012145 A CN202011012145 A CN 202011012145A CN 112112968 A CN112112968 A CN 112112968A
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- Prior art keywords
- spring
- seal structure
- contact seal
- cushion
- composite non
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- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 238000007789 sealing Methods 0.000 claims description 20
- 239000002131 composite material Substances 0.000 claims description 15
- 230000000694 effects Effects 0.000 abstract description 6
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- 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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
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- 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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3244—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with hydrodynamic pumping action
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Sealing Devices (AREA)
Abstract
The application provides a combined type non-contact seal structure, includes: the front plate and the rear plate are fixedly connected to form a shell structure with a containing cavity; the first spring cushion and the second spring cushion are arranged in the containing cavity and are both of ring structures, wherein the first spring cushion and the second spring cushion are provided with elastic parts and airflow holes penetrating through the first spring cushion and the second spring cushion, and when airflow flows through the airflow holes, the elastic parts can move in the radial direction, so that gaps between the first spring cushion and the rotating shaft and gaps between the second spring cushion and the rotating shaft are adjusted. The application provides a have less area of contact and whole rigidity between two sets of spring pads among the combined type non-contact seal structure and between spring pad and the shell structure to can offset the adhesion effect that frictional force produced, the elastic component of two spring pads has better elasticity, thereby makes the follow-up nature of spring pad better, and life and stability obtain improving.
Description
Technical Field
The application belongs to the technical field of seal, in particular to a combined type non-contact seal structure.
Background
As shown in fig. 1, the fingertip seal is a novel seal, and is often used in the fields of missiles, rockets, aeroengines, etc., and has received much attention and use due to its excellent sealing performance, high pressure/high temperature resistance, and relatively low manufacturing cost.
However, the fingertip seal 10 also has certain problems in use, for example, friction force is objectively existed between the fingertip pieces 13 fixed on the housing 11, adhesion is easily generated under the influence of the air flow 14 or external force, so that elasticity is affected, and the fingertip pieces 13 are also easily worn with the shaft 12 violently, so that the gap of the sealing part 13 is enlarged, the leakage amount is increased, and the service life and reliability are reduced. In addition, the multilayer fingertip pieces 13 are tightly attached and rubbed under the harsher environment such as high temperature, high pressure, high linear velocity and the like, large heat generated inside is gradually accumulated, the heat dissipation effect is poor, the fingertip pieces with thin thickness are subjected to thermal deformation, the fingertip pieces are warped, the elasticity of the fingertip pieces is reduced, and the fingertip pieces are easy to damage.
Disclosure of Invention
It is an object of the present application to provide a composite non-contact sealing structure to solve or mitigate at least one problem of the background art.
The technical scheme of the application is as follows: a composite non-contact sealing structure comprising:
the front plate and the rear plate are fixedly connected to form a shell structure with a containing cavity;
the first spring cushion and the second spring cushion are arranged in the containing cavity and are both of ring structures, wherein the first spring cushion and the second spring cushion are provided with elastic parts and airflow holes penetrating through the first spring cushion and the second spring cushion, and when airflow flows through the airflow holes, the elastic parts can move in the radial direction, so that gaps between the first spring cushion and the rotating shaft and gaps between the second spring cushion and the rotating shaft are adjusted.
Preferably, the elastic part is provided with a hook, and the hook forms a limiting structure when the elastic part moves radially.
Preferably, the air flow holes in the circumferential directions of the first spring pad and the second spring pad are arranged in a staggered manner, so that the first spring pad can block the air flow holes in the second spring pad and/or the second spring pad can block the air flow holes in the first spring pad.
Preferably, the elastic parts of the first spring pad are multiple groups, and the multiple groups of elastic parts are uniformly distributed along the axis of the first spring pad.
Preferably, each group of elastic parts of the first spring pad comprises two elastic parts which are symmetrically arranged.
Preferably, the elastic parts of the second spring pad are multiple groups, and the multiple groups of elastic parts are uniformly distributed along the axis of the second spring pad.
Preferably, each group of the elastic parts of the second spring pad comprises two elastic parts, and the two elastic parts are symmetrically arranged.
Preferably, the clearance is determined according to the sealing requirement of the sealing structure.
Preferably, the sealing surfaces of the first spring pad and the second spring pad and the rotating shaft are covered with wear-resistant layers.
Compare with traditional fingertip seal structure, less area of contact and whole rigidity have between two sets of spring pads and between spring pad and the shell structure in the combined type non-contact seal structure that this application provided to can offset the adhesion effect that frictional force produced, the elastic component of two spring pads has better elasticity, thereby makes the follow-up nature of spring pad better, and life and stability obtain improving.
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 view of a fingertip sealing structure in the prior art.
Fig. 2 is a cross-sectional view of the composite non-contact seal structure of the present application.
Fig. 3 is an exploded view of the composite non-contact sealing structure of the present application.
Fig. 4 is a schematic view of the application showing the engagement of two spring pads.
Fig. 5 is a cross-sectional view of two spring pads of the present application as mated.
Fig. 6 is a schematic diagram of the spring pad structure of the present application.
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 problem that easy friction adhesion and fingertip piece warp the warpage problem between the fingertip piece that the fingertip seals among the prior art exists, this application has proposed a combined type non-contact seal structure.
As shown in fig. 2 and 3, the present application proposes a novel composite non-contact sealing structure, which includes: a front plate 21, a back plate 22, a first spring pad 23 and a second spring pad 24. The front plate 21 and the rear plate 22 are substantially annular and have an L-shaped cross-section, and the two plates are fixed to form a housing structure having a cavity. The first spring cushion block 23 and the second spring cushion block 24 are ring-shaped structures with a certain thickness, and the spring cushion part structures are arranged in the accommodating cavity and fastened into a whole through the front plate 21 and the back plate 22. The spring pad has an elastic part on one side close to the rotating shaft 25, and a through air flow groove or air flow hole is arranged on the spring pad body structure, when the air flow flows to the air flow groove or the air flow hole, the elastic part of the spring pad can move in the radial direction, so that the gap between the spring pad and the rotating shaft is adjusted, and sealing is realized.
The utility model provides a combined type non-contact seal structure has adopted the great spring pad of two-layer thickness to carry out the lapped form of circumference dislocation, makes the fingertip part of two spring pads form similar fingertip gasket, guarantees that the breach of two spring pads shelters from each other to form low leakage jointly with outside cladding's shell structure and seals. As shown in fig. 3, the first spring pad 23 and the second spring pad 24 are fastened together by the front plate 21 and the back plate 22, which block most of the airflow and form a sealing function together with the first spring pad 23 and the second spring pad 24. As shown in FIG. 4, the two groups of spring cushion blocks are staggered at an angle in the circumferential direction and attached in a staggered manner, and end face gaps are shielded from each other, so that the air flow throughput is reduced.
In this application, spring pad and pivot clearance fit, spring pad are designed into the structure that accords with the aerodynamics, under the air current effect, and centripetal depth descends, and the sealed clearance dwindles, forms non-contact seal with the axle. As shown in figure 5, the sealing part of the spring pad conforms to the structure of aerodynamics, can be centripetally settled under the action of airflow, is close to the rotating shaft and is contracted to a tiny gap, the gap of the end surface of the spring pad is reduced or closed after settlement, non-contact sealing is realized under a critical state, a wear-resistant layer can be plated on the contact surface according to requirements, and the service life is prolonged.
Specifically, as shown in fig. 6, the first spring pad 23 will be described. The first spring pad 23 is a ring structure with a certain thickness, and the end face of the ring structure is cut or processed by other processing methods to form a through hole or a wire groove on the inner edge of the first spring pad 23, so that the inner edge can generate an elastic part connected with the body structure, and the elastic part can realize the above functions under the action of air flow. Wherein, the elastic part is the multiunit in first spring pad, and its axis circumference equipartition with the spring pad, every group elastic part is including the left elastic part 231 and the right elastic part 232 of symmetry. In addition, the elastic part is also provided with a hook 233, the hook 233 is formed by a part protruding transversely (perpendicular to the movement direction of the elastic part), the hook 233 can play a limiting role, the spring pad can be guaranteed not to generate friction with the rotating shaft 23 after being settled under the action of air flow, meanwhile, the spring pad 23 has sufficient expansion space to contain the accidental jump of the rotating shaft 23, and the rotating shaft and the spring pad are prevented from generating structural damage due to hard contact.
In this application, can cover on pivot or spring pad and have wear-resisting coating for needs sealed structure one side, further improve the life of spring pad and pivot.
In this application, because have less area of contact between two spring pads and between spring pad and shell structure, the spring has better elasticity and whole rigidity fast simultaneously to offset the adhesion effect that frictional force produced, made the follow-up nature of spring pad better, life and stability have obtained improving. The composite non-contact seal can be suitable for more severe environments such as high temperature, high pressure, high linear speed and the like.
Compared with the traditional fingertip sealing structure, the combined type non-contact sealing structure provided by the application has the following advantages:
1) the two groups of spring pads and the shell structure have smaller contact areas and stronger overall rigidity, so that the adhesion effect generated by friction force can be counteracted, and the elastic parts of the two spring pads have better elasticity, so that the follow-up property of the spring pads is better, and the service life and the stability are improved;
2) the circumferential spring pad is in clearance fit with the rotating shaft, the structure of the spring pad conforms to the structure of aerodynamics, and the spring pad is deeply lowered towards the axis under the action of airflow, and the sealing clearance is reduced to form non-contact sealing with the shaft;
3) a large enough gap is formed between the two spring pads, so that heat dissipation is easy, heat accumulation is not easy to generate, and the influence of high heat on the performance of the spring pads can be prevented;
4) the spring pad and the shell structure coated on the outer side form an air bag chamber, so that the elasticity and the follow-up property of the spring pad are improved;
5) the method can be suitable for more severe environments such as high temperature, high pressure, high linear speed and the like;
6) has relatively low production cost.
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 (9)
1. A composite non-contact seal structure, comprising:
the front plate and the rear plate are fixedly connected to form a shell structure with a containing cavity;
the first spring cushion and the second spring cushion are arranged in the containing cavity and are both of ring structures, wherein the first spring cushion and the second spring cushion are provided with elastic parts and airflow holes penetrating through the first spring cushion and the second spring cushion, and when airflow flows through the airflow holes, the elastic parts can move in the radial direction, so that gaps between the first spring cushion and the rotating shaft and gaps between the second spring cushion and the rotating shaft are adjusted.
2. The composite non-contact seal structure of claim 1, wherein the resilient portion has a hook that forms a stop when the resilient portion moves radially.
3. The composite non-contact seal structure according to claim 1, wherein the first spring washer and the second spring washer have air flow holes in the circumferential direction that are staggered such that the first spring washer blocks the air flow holes in the second spring washer and/or the second spring washer blocks the air flow holes in the first spring washer.
4. The composite non-contact seal structure of claim 1, wherein the first spring pad has a plurality of sets of resilient portions, the plurality of sets of resilient portions being evenly spaced about an axis of the first spring pad.
5. The composite non-contact seal structure of claim 4, wherein each set of the first spring pad includes two spring portions, and the two spring portions are symmetrically disposed.
6. The composite non-contact seal structure of claim 1, wherein the plurality of sets of elastic portions of the second spring pad are evenly distributed about an axis of the second spring pad.
7. The composite non-contact seal structure of claim 6, wherein each set of resilient portions of the second spring pad includes two resilient portions, and the two resilient portions are symmetrically disposed.
8. The composite non-contact seal structure of claim 1, wherein the gap is determined according to the sealing requirements of the seal structure.
9. The composite non-contact seal structure of claim 1, wherein the sealing surfaces of the first and second spring washers and the shaft are coated with a wear resistant layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011012145.5A CN112112968A (en) | 2020-09-23 | 2020-09-23 | Combined type non-contact seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011012145.5A CN112112968A (en) | 2020-09-23 | 2020-09-23 | Combined type non-contact seal structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112112968A true CN112112968A (en) | 2020-12-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011012145.5A Pending CN112112968A (en) | 2020-09-23 | 2020-09-23 | Combined type non-contact seal structure |
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| Country | Link |
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| CN (1) | CN112112968A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102911A (en) * | 1993-06-04 | 1995-05-24 | Prc公司 | Sealing method and arrangement for turbine compressor and laser emploing same |
| US20040188947A1 (en) * | 2003-03-26 | 2004-09-30 | Siemens Westinghouse Power Corporation | Seal assembly for a rotary machine |
| CN102985727A (en) * | 2010-07-07 | 2013-03-20 | 西门子公司 | Shaft sealing device |
| CN103982248A (en) * | 2014-05-21 | 2014-08-13 | 南京博沃科技发展有限公司 | Blade type sealing device having clearance control function |
| CN206987893U (en) * | 2017-05-10 | 2018-02-09 | 昆明理工大学 | A kind of compound seal of non-contact Finger seal shoe guide brush seal |
| CN108506497A (en) * | 2018-07-06 | 2018-09-07 | 中国科学院上海高等研究院 | A kind of plastic seal ring and the shutdown sealing device with plastic seal ring |
| US20190101014A1 (en) * | 2017-09-29 | 2019-04-04 | United Technologies Corporation | Dual hydrostatic seal assembly |
| CN109844380A (en) * | 2016-11-23 | 2019-06-04 | 舍弗勒技术股份两合公司 | Sealing device |
| CN110195617A (en) * | 2019-07-19 | 2019-09-03 | 中国航发沈阳发动机研究所 | A kind of finger sealing device |
-
2020
- 2020-09-23 CN CN202011012145.5A patent/CN112112968A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102911A (en) * | 1993-06-04 | 1995-05-24 | Prc公司 | Sealing method and arrangement for turbine compressor and laser emploing same |
| US20040188947A1 (en) * | 2003-03-26 | 2004-09-30 | Siemens Westinghouse Power Corporation | Seal assembly for a rotary machine |
| CN102985727A (en) * | 2010-07-07 | 2013-03-20 | 西门子公司 | Shaft sealing device |
| CN103982248A (en) * | 2014-05-21 | 2014-08-13 | 南京博沃科技发展有限公司 | Blade type sealing device having clearance control function |
| CN109844380A (en) * | 2016-11-23 | 2019-06-04 | 舍弗勒技术股份两合公司 | Sealing device |
| CN206987893U (en) * | 2017-05-10 | 2018-02-09 | 昆明理工大学 | A kind of compound seal of non-contact Finger seal shoe guide brush seal |
| US20190101014A1 (en) * | 2017-09-29 | 2019-04-04 | United Technologies Corporation | Dual hydrostatic seal assembly |
| CN108506497A (en) * | 2018-07-06 | 2018-09-07 | 中国科学院上海高等研究院 | A kind of plastic seal ring and the shutdown sealing device with plastic seal ring |
| CN110195617A (en) * | 2019-07-19 | 2019-09-03 | 中国航发沈阳发动机研究所 | A kind of finger sealing device |
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Application publication date: 20201222 |