CN113513592B - Foil end face air film sealing structure with boot-shaped dynamic pressure flexible sealing dam - Google Patents
Foil end face air film sealing structure with boot-shaped dynamic pressure flexible sealing dam Download PDFInfo
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- CN113513592B CN113513592B CN202110551875.0A CN202110551875A CN113513592B CN 113513592 B CN113513592 B CN 113513592B CN 202110551875 A CN202110551875 A CN 202110551875A CN 113513592 B CN113513592 B CN 113513592B
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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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
- F16J15/3408—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface
- F16J15/3428—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface with a wavy surface
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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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- 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
- F16J15/3268—Mounting of sealing rings
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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
- F16J15/3292—Lamellar structures
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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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/36—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member
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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
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
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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 discloses a foil end face air film sealing structure with a boot-shaped dynamic pressure flexible sealing dam, which comprises a ring body, sealing sheets, a radial annular sealing gasket, a bottom annular sealing gasket, an inner diameter clamping plate and an outer diameter clamping plate. The annular groove is formed in the upper surface of the ring body, and the bottom annular sealing gasket is paved at the bottom of the annular groove. The sealing sheets comprise a plurality of sealing sheets with boots and a plurality of sealing sheets without boots; the boot-carrying sealing piece comprises a body, a gap and a boot; the boot-free sealing piece comprises a body and a gap; the gaps of two adjacent sealing sheets are not communicated; the boot with the boot sealing piece is arranged on the upper end surface of the second split body in a gland mode, the boot sealing piece and the boot-free sealing piece are embedded into the annular groove to form a sealing dam, and an inner diameter clamping plate is arranged on the inner diameter side of the sealing dam; an outer diameter clamping plate is arranged on the outer diameter side of the sealing dam; the annular groove is externally connected with a circular ring platform, and a foil end face mechanism is arranged on the circular ring platform. The application has the advantages of higher stability, reliability, high temperature resistance, friction resistance, long service life and the like.
Description
Technical Field
The application relates to the field of dry gas sealing, in particular to a foil end face gas film sealing structure with a boot-shaped dynamic pressure flexible sealing dam.
Background
The dry gas seal is a non-contact mechanical seal taking gas as a lubricating medium, and the excellent working performance of the dry gas seal gradually replaces labyrinth seal, brush seal and the like, but with the appearance of a high-rotation-speed and large-journal compressor, the rigid surface of the dry gas seal is easy to break, severely abrade and the like under complex working conditions, so that the sealing element is damaged. When the flexible end face of the flexible end face air film sealing structure is subjected to impact disturbance, the end face flexible support deforms to absorb impact energy, so that the purpose of protecting the sealing element is achieved.
The foil end face of the conventional foil end face air film sealing structure has certain impact resistance, but when a sealing dam with a rigid surface is impacted, the situation that the sealing dam end face is broken, severely worn and the like easily occurs, so that a sealing device is invalid.
Disclosure of Invention
The application aims to provide a foil end face air film sealing structure with a boot-shaped dynamic pressure flexible sealing dam, which can solve one or more of the technical problems.
In order to achieve the above purpose, the technical scheme provided by the application is as follows:
a foil end face air film sealing structure with a boot-shaped dynamic pressure flexible sealing dam comprises a movable ring and a static ring, wherein the sealing structure is arranged on the movable ring or the static ring.
The sealing structure comprises a ring body, a sealing piece, a radial annular sealing gasket, a bottom annular sealing gasket, an inner diameter clamping plate and an outer diameter clamping plate.
The annular groove is formed in the upper surface of the ring body, and the bottom annular sealing gasket is paved at the bottom of the annular groove.
The sealing sheets comprise a plurality of sealing sheets with boots and a plurality of sealing sheets without boots;
the boot-carrying sealing piece comprises a body, a gap and a boot; the gap divides the body into a plurality of inclined first split bodies downwards from the upper end face of the body, and boots protruding out of the first split bodies are arranged on the upper end face of each first split body;
the boot-free sealing piece comprises a body and a gap; the gap divides the body into a plurality of inclined second split bodies downwards from the upper end face of the body;
the gaps of two adjacent sealing sheets are not communicated; the boot with the boot sealing piece is arranged on the upper end face of the second split body in a gland mode, and the boot sealing piece and the boot-free sealing piece are embedded into the annular groove to form a sealing dam;
an inner diameter clamping plate is arranged on the inner diameter side of the sealing dam; a radial annular sealing gasket is arranged between the inner diameter clamping plate and the side wall of the annular groove, and a radial annular sealing gasket is arranged between the inner diameter clamping plate and the sealing dam;
an outer diameter clamping plate is arranged on the outer diameter side of the sealing dam; a radial annular sealing gasket is arranged between the outer diameter clamping plate and the side wall of the annular groove, and a radial annular sealing gasket is arranged between the outer diameter clamping plate and the sealing dam;
the annular groove is externally connected with an annular platform, and a foil end face mechanism is arranged on the annular platform.
Further: and each split upper end face is provided with an elliptical oblique cylinder cavity along the split oblique direction.
Further: the depth of the oblique elliptic cylinder cavity is 2-8 mu m.
Further: the slit comprises a vertical slit and a horizontal slit, the horizontal slit is communicated with the vertical slit below the vertical slit to form an L-shaped slit, wherein the width of the vertical slit is 0.1-1 mm, and the vertical slit lengths of two adjacent sealing sheets are different, so that the heights from the horizontal slit to the bottoms of the sealing sheets are different.
Further: the boot-strap sealing piece and the boot-less sealing piece are respectively two, and the boot-strap sealing piece is clamped between the boot-less sealing pieces.
Further: the foil end face mechanism comprises a wave foil and a flat foil; the wave foils are wavy, a plurality of wave foils are tiled on the circular ring platform end to end, and a flat foil is covered on each wave foil; the flat foil and the bump foil are fixed at one end and free at the other end.
Further: the ring body is provided with a T-shaped groove, and the bottom of the T-shaped groove is communicated with the second installation cavity; the second positioning block is embedded into the second mounting cavity, the fixed end of the flat foil and the fixed end of the wave foil are inserted into the T-shaped groove, and the fixed end of the flat foil and the fixed end of the wave foil are extruded by the second positioning block; the second screw enters the second installation cavity through the second threaded hole to prop against the second positioning block.
Further: the circumferential directions from the fixed end to the free end of the flat foil and the corrugated foil are consistent with the circumferential direction of the airflow; the upper surface of the free end of the flat foil is not lower than the upper surface of the sealing dam; the upper surface of the fixed end of the flat foil is lower than the upper surface of the sealing dam.
Further: the upper surface of the free end of the flat foil is 0.1-3 mu m higher than the upper surface of the sealing dam, and the upper surface of the fixed end of the flat foil is 1-20 mu m lower than the upper surface of the sealing dam.
Further: a first mounting cavity is formed in the outer side wall of the annular groove, and a first threaded hole penetrates through the external platform to the first mounting cavity; the first positioning block is embedded into the first mounting cavity and is propped against the outer radial annular sealing gasket; the front end of the first screw abuts against the first positioning block through the first threaded hole.
The application has the technical effects that:
the sealing structure provided by the application has the wear-resistant and impact-resistant flexible sealing dam and the flexible foil end surface with excellent opening performance, can effectively absorb impact energy through self-adaptive deformation of the whole sealing end surface, overcomes the defects of the conventional foil end surface air film sealing structure, and ensures the end surface impact resistance of the sealing device and excellent sealing performance.
The flexible end face air film sealing structure can be well adapted to the influence caused by external disturbance and working condition change, has the advantages of high stability, reliability, high temperature resistance, friction resistance, long service life and the like, and has excellent application background in a modern industrial system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
In the drawings:
fig. 1 is a schematic structural view of the present application.
Fig. 2 is a schematic three-dimensional explosion diagram of the present application.
Fig. 3 is a schematic view of the foil and seal arrangement of the present application.
Fig. 4 is a schematic cross-sectional structure of the present application.
Fig. 5 is an enlarged partial schematic view of fig. 4.
FIG. 6 is a schematic view of a ring body of the present application.
Fig. 7 is a schematic view of a bump foil of the present application.
Fig. 8 is a schematic view of a flat foil of the present application.
Fig. 9 is a schematic view of an outer boot seal of the present application.
Fig. 10 is a schematic view of the inner band shoe seal of the present application.
Fig. 11 is a schematic view of the boot seal after deformation.
Fig. 12 is an enlarged view of a portion of a slit before deformation of the sealing sheet.
Fig. 13 is an enlarged view of a part of the slit after the sealing sheet is deformed.
Fig. 14 is a schematic view of a bootless seal sheet of the present application.
Fig. 15 is a schematic view of a radial annular seal of the present application.
Fig. 16 is a schematic view of the bottom annular gasket of the present application.
Fig. 17 is a schematic view of an inner diameter splint and an outer diameter splint according to the present application.
FIG. 18 is a schematic view of the mounting of the internal components of the annular groove.
Fig. 19 is a schematic view of a bump foil, flat foil installation.
Wherein the above figures include the following reference numerals:
1-a ring body; 2-flat foil; 3-bump foil; 4-an oblique elliptic cylinder cavity; 5-boots; 6, a gap; 7-a first radial annular gasket; 8-a second radial annular gasket; 9-a third radial annular gasket; 10-fourth radial annular gasket; 11-an inner diameter splint; 12-an outer diameter splint; 13-a first bootless seal sheet; 14-a second bootless seal sheet; 15-a first boot seal; 16-a second boot seal; 17-a circular ring platform; 18-a circular groove; 19-a first mounting cavity; 20-a first threaded hole; 21-a first positioning block; 22—a first screw; 23-a second mounting cavity; 24-a second positioning block; 25-a second screw; 26- "T" shaped slots; 27-sealing a dam; 28-bottom annular gasket.
Description of the embodiments
The present application will be described in detail below with reference to the drawings and the specific embodiments thereof, wherein the exemplary embodiments and the description are for the purpose of illustrating the application only and are not to be construed as unduly limiting the application.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms ", and the like in the description and claims of the present application and the above-described drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be capable of being practiced otherwise than as specifically illustrated and described. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1-19. A foil end face air film sealing structure with a boot-shaped dynamic pressure flexible sealing dam comprises a ring body 1, sealing sheets, a radial annular sealing gasket, a bottom annular sealing gasket 28, an inner diameter clamping plate 11 and an outer diameter clamping plate 12.
The upper surface of the ring body 1 is provided with an annular groove 18, and the bottom annular sealing gasket 28 is paved at the bottom of the annular groove 18. The bottom annular gasket 28 has a width that corresponds to the width of the annular groove 18.
The sealing sheets comprise a plurality of sealing sheets with boots and a plurality of sealing sheets without boots;
the boot sealing piece comprises a body, a gap 6 and a boot 5; the gap divides the body into a plurality of inclined first split bodies downwards from the upper end face of the body, and each first split body is provided with a boot 5 protruding out of the first split body on the upper end face;
the boot-free sealing piece comprises a body and a gap; the gap divides the body into a plurality of inclined second split bodies downwards from the upper end face of the body;
the gaps of two adjacent sealing sheets are not communicated; the gaps 6 of the adjacent sealing sheets are uniformly staggered along the circumferential direction, namely, the gaps 6 of any sealing sheet are aligned with the non-slotting positions of the adjacent sealing sheets, so that a sealing wall is formed to prevent the medium from leaking along the radial direction.
In certain embodiments: the slit comprises a vertical slit and a horizontal slit, the horizontal slit is communicated with the vertical slit below the vertical slit to form an L-shaped slit, and specifically, the vertical slit is cut in an inclined mode at a certain angle, and the horizontal slit is cut in a horizontal mode to form a triangle shape. The width of the vertical seam is 0.1-1 mm, and the lengths of the vertical seams of two adjacent sealing sheets are different, so that the heights from the transverse seam to the bottoms of the sealing sheets are different, and the situation that the gaps 6 of the two adjacent sealing sheets are not communicated during installation is effectively ensured.
The boot 5 covers the upper end face of the second split body, the boot-carrying sealing piece and the boot-free sealing piece are embedded into the annular groove 18 to form a sealing dam 27, and an inner diameter clamping plate 11 is arranged on the inner diameter side of the sealing dam 27; a radial annular sealing gasket is arranged between the inner diameter clamping plate 11 and the side wall of the annular groove 18, and the radial annular sealing gasket is arranged between the inner diameter clamping plate 11 and the sealing dam 27; an outer diameter clamping plate 12 is arranged on the outer diameter side of the sealing dam 27; radial annular sealing gaskets are arranged between the outer diameter clamping plate 12 and the side wall of the annular groove 18, and radial annular sealing gaskets are arranged between the outer diameter clamping plate 12 and the sealing dam 27.
The annular groove circumscribes the annular platform 17, and a foil end face mechanism is arranged on the annular platform 17. In certain embodiments: the foil end face mechanism comprises a bump foil 3 and a flat foil 2; the wave foil pieces 3 are wavy, a plurality of wave foil pieces 3 are tiled on the circular ring platform 17 end to end, and a flat foil piece 2 is covered on each wave foil piece 3; the flat foil 2 and the bump foil 3 are fixed at one end and free at the other end.
In certain embodiments: a T-shaped groove 26 is formed in the ring body 1, and the bottom of the T-shaped groove 26 is communicated with the second mounting cavity 23; the second positioning block 24 is embedded into the second mounting cavity 23, the fixed end of the flat foil 2 and the fixed end of the bump foil 3 are inserted into the T-shaped groove 26, and the fixed end of the flat foil 2 and the fixed end of the bump foil 3 are extruded by the second positioning block 26; the second screw 25 enters the second installation cavity 23 through the second threaded hole and abuts against the second positioning block 24.
In certain embodiments: each of the split upper end surfaces is provided with an elliptical oblique cylinder cavity 4 (also called elliptical texture) along the split oblique direction.
In certain embodiments: the depth of the oblique elliptic cylinder cavity 4 is 2-8 mu m.
As shown in fig. 9, 10, in some embodiments: the shoe seal sheets (first shoe seal sheet 16 and second shoe seal sheet 15) and the non-shoe seal sheet are each two sheets, with the shoe seal sheet sandwiched therebetween.
The boot 5 with the boot seal is protruded outwards in opposite directions and just covers the adjacent boot-free seal; the shoe 5 of the second shoe 15 extends to the inner diameter side and the shoe 5 of the other first shoe 16 extends to the outer diameter side to form a support surface.
In certain embodiments: the circumferential directions from the fixed end to the free end of the flat foil 2 and the bump foil 3 are consistent with the circumferential direction of the airflow; the upper surface of the free end of the flat foil 2 is not lower than the upper surface of the sealing dam 27, and the upper surface of the fixed end of the flat foil 2 is lower than the upper surface of the sealing dam 27. The bump foil 3 and the flat foil 2 bear the main supporting function to protect the sealing dam from damage, and meanwhile, when the bump foil 3 and the flat foil 2 are in failure in supporting, the sealing dam 27 also has flexible shock resistance to protect the sealing dam 25 from damage, so that the sealing effect is achieved.
In certain embodiments: the upper surface of the free end of the flat foil is 0.1-3 mu m higher than the upper surface of the sealing dam, and the upper surface of the fixed end of the flat foil is 1-20 mu m lower than the upper surface of the sealing dam.
In certain embodiments: a first installation cavity 19 is formed in the outer side wall of the annular groove 18, and a first threaded hole 20 penetrates through the external connection platform 17 to the first installation cavity 24; the first positioning block 21 is embedded into the first mounting cavity 19 and abuts against the outer radial annular sealing gasket 7; the front end of the first screw 22 abuts against the positioning block 21 through the first threaded hole 20. The gap between the parts is compressed to achieve a better sealing effect, and the installation mode is simpler and more convenient to replace internal parts and easy to operate.
The inner side of the sealing end face adopts a mode of overlapping and installing a plurality of sealing sheets, each sealing sheet is uniformly provided with L-shaped gaps with the same shape and size, and the L-shaped gaps provide space for axial and circumferential deformation of the sealing sheets, so that the impact resistance of the sealing end face is ensured; the sealing piece is divided into a plurality of independent bearing units by the gaps, and when the pressure of the air film changes, each unit independently deforms, so that the stability, the reliability and the self-adaptability of the sealing operation are ensured;
meanwhile, the gaps of the sealing sheets are uniformly staggered during installation, so that leakage of a medium along the sealing end face and the bottom can be effectively prevented; the boot surface with the boot sealing piece provides a supporting surface for the sealing end surface, and elliptical textures are arranged on the boot surface, so that the dynamic pressure effect of the sealing device can be enhanced, and the sealing opening performance is improved; therefore, the flexible supporting structure with the corrugated foil and the sealing sheet as the sealing end faces can deform respectively to adapt to various working condition changes between the sealing end faces, and the dynamic balance of film thickness and film pressure between the sealing end faces is stably and efficiently realized, so that the stability and the shock resistance of sealing operation are improved, and the sealing service life is prolonged.
The wave foil piece divided into independent units is adopted as an elastic support outside the sealing end face, the independent units are favorable for the wave foil piece to independently work under the actions of thermal deformation and extrusion during sealing operation, the interaction influence is reduced, the deformation capacity of each independent unit is determined by the rigidity of the wave foil piece, and when the pressure of the air film changes, each independent unit correspondingly deforms to adapt to the change of working conditions.
Compared with the traditional dry gas seal and early foil seal, the application has more excellent stability, high temperature and high pressure resistance, impact resistance and sustainable operation capability under complex working conditions.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (9)
1. The utility model provides a foil terminal surface air film seal structure with flexible sealing dam of boots dynamic pressure, includes moving ring and quiet ring, and this seal structure sets up on moving ring or quiet ring, its characterized in that: comprises a ring body (1), a sealing piece, a radial annular sealing gasket, a bottom annular sealing gasket (28), an inner diameter clamping plate (11) and an outer diameter clamping plate (12);
an annular groove (18) is formed in the upper surface of the ring body (1), and the bottom annular sealing gasket (28) is paved at the bottom of the annular groove (18);
the sealing sheets comprise a plurality of sealing sheets with boots and a plurality of sealing sheets without boots;
the boot-carrying sealing piece comprises a body, a gap and a boot; the gap divides the body into a plurality of inclined first split bodies downwards from the upper end face of the body, and each first split body is provided with a boot (5) protruding out of the first split body on the upper end face;
the boot-free sealing piece comprises a body and a gap; the gap divides the body into a plurality of inclined second split bodies downwards from the upper end face of the body;
the gaps of two adjacent sealing sheets are not communicated; the boot (5) with the boot sealing piece is arranged on the upper end face of the second split body in a gland mode, and the boot sealing piece and the boot-free sealing piece are embedded into the annular groove (18) to form a sealing dam (27);
an inner diameter clamping plate (11) is arranged on the inner diameter side of the sealing dam (27); a radial annular sealing gasket is arranged between the inner diameter clamping plate (11) and the side wall of the annular groove (18), and a radial annular sealing gasket is arranged between the inner diameter clamping plate (11) and the sealing dam (27);
an outer diameter clamping plate (12) is arranged on the outer diameter side of the sealing dam (27); a radial annular sealing gasket is arranged between the outer diameter clamping plate (12) and the side wall of the annular groove (18), and a radial annular sealing gasket is arranged between the outer diameter clamping plate (12) and the sealing dam (27);
the annular groove is externally connected with an annular platform (17), a foil end face mechanism is arranged on the annular platform (17), and the foil end face mechanism comprises a corrugated foil (3) and a flat foil (2); the wave foils (3) are wavy, a plurality of wave foils (3) are tiled on the circular ring platform (17) end to end, and a flat foil (2) is covered on each wave foil (3); the flat foil (2) and the bump foil (3) are fixed at one end and free at the other end.
2. The foil end face gas film sealing structure with shoe dynamic pressure flexible sealing dam according to claim 1, wherein: and each split upper end face is provided with an elliptical oblique cylinder cavity (4) along the split oblique direction.
3. The foil end face gas film sealing structure with shoe dynamic pressure flexible sealing dam according to claim 2, wherein: the depth of the oblique elliptic cylinder cavity (4) is 2-8 mu m.
4. The foil end face gas film sealing structure with shoe dynamic pressure flexible sealing dam according to claim 1, wherein: the slit comprises a vertical slit and a horizontal slit, the horizontal slit is communicated with the vertical slit below the vertical slit to form an L-shaped slit, the width of the vertical slit is 0.1-1 mm, and the vertical slit lengths of two adjacent sealing sheets are different.
5. The foil end face gas film sealing structure with shoe dynamic pressure flexible sealing dam according to claim 1, wherein: the boot-strap sealing piece and the boot-less sealing piece are respectively two, and the boot-strap sealing piece is clamped between the boot-less sealing pieces.
6. The foil end face gas film sealing structure with shoe dynamic pressure flexible sealing dam according to claim 5, wherein: a T-shaped groove (26) is formed in the ring body (1), and the bottom of the T-shaped groove (26) is communicated with the second mounting cavity (23); the second positioning block (24) is embedded into the second mounting cavity (23), the fixed end of the Ping Bopian (2) and the fixed end of the bump foil (3) are inserted into the T-shaped groove (26), and the fixed end of the Ping Bopian (2) and the fixed end of the bump foil (3) are extruded by the second positioning block (26); the second screw (25) enters the second installation cavity (23) through the second threaded hole and abuts against the second positioning block (24).
7. The foil end face gas film sealing structure with shoe dynamic pressure flexible sealing dam according to claim 1, wherein: the circumferential directions from the fixed end to the free end of the flat foil (2) and the corrugated foil (3) are consistent with the circumferential direction of the airflow; the upper surface of the free end of the flat foil is not lower than the upper surface of the sealing dam; the upper surface of the fixed end of the flat foil is lower than the upper surface of the sealing dam.
8. The foil end face gas film sealing structure with shoe dynamic pressure flexible sealing dam according to claim 1, wherein: the upper surface of the free end of the flat foil is 0.1-3 mu m higher than the upper surface of the sealing dam, and the upper surface of the fixed end of the flat foil is 1-20 mu m lower than the upper surface of the sealing dam.
9. The foil end face gas film sealing structure with shoe dynamic pressure flexible sealing dam according to claim 1, wherein: a first mounting cavity (19) is formed in the outer side wall of the annular groove (18), and a first threaded hole (20) penetrates through the external connection platform (17) to the first mounting cavity (19); the first positioning block (21) is embedded into the first mounting cavity (19) to be propped against the outer radial annular sealing gasket; the front end of the first screw (22) is propped against the first positioning block (21) through the first threaded hole (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110551875.0A CN113513592B (en) | 2021-05-20 | 2021-05-20 | Foil end face air film sealing structure with boot-shaped dynamic pressure flexible sealing dam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110551875.0A CN113513592B (en) | 2021-05-20 | 2021-05-20 | Foil end face air film sealing structure with boot-shaped dynamic pressure flexible sealing dam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113513592A CN113513592A (en) | 2021-10-19 |
| CN113513592B true CN113513592B (en) | 2023-10-20 |
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| CN202110551875.0A Active CN113513592B (en) | 2021-05-20 | 2021-05-20 | Foil end face air film sealing structure with boot-shaped dynamic pressure flexible sealing dam |
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Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6446976B1 (en) * | 2000-09-06 | 2002-09-10 | Flowserve Management Company | Hydrodynamic face seal with grooved sealing dam for zero-leakage |
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| CN210343823U (en) * | 2019-07-07 | 2020-04-17 | 南京林业大学 | Combined non-contact double-end-face seal based on magnetic liquid seal and fluid dynamic pressure mechanical seal |
| CN112648379A (en) * | 2021-02-02 | 2021-04-13 | 昆明理工大学 | Elastic wave foil type cylindrical surface air film flexible supporting structure |
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2021
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| US6446976B1 (en) * | 2000-09-06 | 2002-09-10 | Flowserve Management Company | Hydrodynamic face seal with grooved sealing dam for zero-leakage |
| CN101749430A (en) * | 2009-12-25 | 2010-06-23 | 中国燃气涡轮研究院 | Finger tip sealing device and the flexible constrictor |
| CN102155269A (en) * | 2011-03-04 | 2011-08-17 | 北京航空航天大学 | Design method for gas film seal damping structure for aircraft engine rotor system and gas film seal damping structure |
| CN203791368U (en) * | 2014-01-13 | 2014-08-27 | 宛亚坤 | Coupling device |
| CN104896101A (en) * | 2015-05-26 | 2015-09-09 | 浙江工业大学 | End face gas film sealing structure for bump-type foil |
| CN204692585U (en) * | 2015-05-26 | 2015-10-07 | 浙江工业大学 | A kind of ripple foil-type paillon foil gas film face seal structure |
| CN104913064A (en) * | 2015-05-29 | 2015-09-16 | 浙江工业大学 | Gas film face seal structure for cantilever-type foils |
| CN105090512A (en) * | 2015-07-22 | 2015-11-25 | 哈尔滨工业大学 | Non-contact type dynamic-pressing foil sealing piece for rotary machine |
| CN105387213A (en) * | 2015-12-30 | 2016-03-09 | 北京交通大学 | Magnetic liquid and mechanical seal combined sealing device applied to nuclear reactor main pump seal |
| CN107269848A (en) * | 2017-07-06 | 2017-10-20 | 浙江工业大学 | foil end face air film sealing structure based on magnetic control shape memory effect |
| CN107289136A (en) * | 2017-07-06 | 2017-10-24 | 南阳神鹰装备制造有限公司 | A kind of air levitation sealing structure for rotating machinery |
| CN107906208A (en) * | 2017-12-13 | 2018-04-13 | 广西科技大学 | A kind of dome camber device for sealing magnetic fluid |
| CN109163094A (en) * | 2018-10-31 | 2019-01-08 | 中国计量大学 | A kind of paillon gas film face seal structure of extruding and dynamic pressure effect synergistic effect |
| CN209511114U (en) * | 2019-02-15 | 2019-10-18 | 中国航发商用航空发动机有限责任公司 | Diaphragm seal, fingertip sealing structure and double-shaft seal structure |
| CN210343823U (en) * | 2019-07-07 | 2020-04-17 | 南京林业大学 | Combined non-contact double-end-face seal based on magnetic liquid seal and fluid dynamic pressure mechanical seal |
| CN112648379A (en) * | 2021-02-02 | 2021-04-13 | 昆明理工大学 | Elastic wave foil type cylindrical surface air film flexible supporting structure |
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| CN113513592A (en) | 2021-10-19 |
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