CN108506494B - Fish bone-like dry gas sealing structure - Google Patents
Fish bone-like dry gas sealing structure Download PDFInfo
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- CN108506494B CN108506494B CN201810368239.2A CN201810368239A CN108506494B CN 108506494 B CN108506494 B CN 108506494B CN 201810368239 A CN201810368239 A CN 201810368239A CN 108506494 B CN108506494 B CN 108506494B
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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
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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
Abstract
The invention discloses a fishbone-like dry gas sealing structure, which comprises a movable ring and a stationary ring; the outer diameter side of the end faces of the moving ring and the static ring is a sealing inlet, namely a high-pressure side, and the inner diameter side of the end faces of the moving ring and the static ring is a sealing outlet, namely a low-pressure side; a plurality of fishbone-like grooves are uniformly distributed on the high-pressure side of at least one end surface of the movable ring and the static ring along the circumferential direction; the non-perforated area between two circumferentially adjacent fish bone-like grooves is a sealing weir (4), and an annular sealing dam (8) is arranged below the fish bone-like grooves. The invention has the remarkable advantages of strong opening capability, high stability, low leakage, capability of reducing the deformation of the sealing end surface, capability of rotating in two directions and the like, and has wide market prospect.
Description
Technical Field
The invention relates to a fishbone-like dry gas sealing structure which is suitable for sealing various rotary machines.
Background
With the development of science and technology, the fields of energy power, petrochemical industry and the like put forward higher requirements on the sealing structure. The dry gas seal has been widely used in rotary machines due to its significant advantages of low leakage, low wear, long life, etc. At present, the dry gas seal widely applied is mostly a one-way rotary seal, and is not suitable for two-way rotary machinery. The existing dry gas seal capable of rotating in two directions has the defects of weak dynamic pressure opening effect, high leakage quantity, large deformation of a seal end face and the like. In view of such circumstances, it is necessary to develop a seal structure suitable for bidirectional rotation that can enhance the opening capability, lower the end surface temperature, reduce the amount of leakage, and operate stably.
Disclosure of Invention
The invention aims to provide a fishbone-like dry gas sealing structure which has the advantages of obvious dynamic pressure effect, strong opening capability and high stability and can be used for sealing various rotary machines.
The invention is realized by adopting the following technical scheme:
a fishbone-like dry gas sealing structure comprises a movable ring and a stationary ring; the outer diameter side of the end faces of the moving ring and the static ring is a sealing inlet, namely a high-pressure side, and the inner diameter side of the end faces of the moving ring and the static ring is a sealing outlet, namely a low-pressure side; a plurality of fishbone-like grooves are uniformly distributed on the high-pressure side of at least one end surface of the movable ring and the static ring along the circumferential direction; the non-perforated area between two adjacent fish bone-like grooves in the circumferential direction is a sealing weir, and an annular sealing dam is arranged below the fish bone-like grooves.
The invention has the further improvement that each fishbone-like groove comprises a radial drainage groove, a forward spiral groove, a reverse spiral groove and a fishtail combination groove which are connected with the radial drainage groove; the radial drainage groove is radially converged, the forward spiral groove and the reverse spiral groove are symmetrical about the central axis of the radial drainage groove and are connected to two sides of the radial drainage groove, the forward spiral groove and the reverse spiral groove are increased and then reduced in variation trend from a high-pressure area to a low-pressure area along the radial direction, and the spiral groove in the middle of the sealing end surface is the largest; the fish tail combined groove is symmetrical about the central axis of the radial drainage groove.
In a further refinement of the present invention, the radial drainage groove has a profile that includes a first arc, a first straight line, a second arc, and a second straight line connected in series, and the first straight line and the second straight line are symmetrical about the central axis.
The invention has the further improvement that the profile of the forward spiral groove comprises a first arc line, a first spiral line and a second arc line which are connected in sequence, and the profile of the reverse spiral groove comprises a third arc line, a second spiral line and a fourth arc line which are connected in sequence; the profile of the fishtail combined groove comprises a fifth arc line, a third spiral line, a sixth arc line, a fourth spiral line and a seventh arc line which are connected in sequence.
The invention has the further improvement that the adjacent spiral grooves of the two circumferentially adjacent fishbone-like grooves are connected through an arc groove.
The invention has the further improvement that the downstream positions of the forward spiral groove and the reverse spiral groove are provided with directional big holes, and the directional big holes are elliptical big holes or rhombic big holes.
The fish bone-like groove is further improved in that the fish bone-like groove is an equal-depth groove, a step-shaped unequal-depth groove or a cone angle convergence type unequal-depth groove.
The invention has the further improvement that the sealing dam is uniformly provided with a plurality of micropores, and the micropores are circular micropores, oval micropores, rhombic micropores or square micropores.
The invention is further improved in that a plurality of ball socket/ball convex heat exchange structures are uniformly distributed on the outer diameter surface of the sealing structure.
The invention is further improved in that the arrangement mode of the ball socket/spherical convex heat exchange structure is arranged in a sequential or staggered mode, and the shape of the ball socket/spherical convex heat exchange structure is spherical, ellipsoidal or teardrop-shaped.
The invention has the following beneficial technical effects:
the invention provides a fishbone-like dry gas sealing structure which comprises a moving ring and a static ring. The outside diameter side of the end faces of the moving ring and the static ring is a sealing inlet, namely a high-pressure side, and the inside diameter side is a sealing outlet, namely a low-pressure side. The high-pressure side on at least one end surface of the movable ring and the static ring is evenly distributed with fishbone-like grooves along the circumferential direction. The non-perforated area between the circumferentially adjacent fish bone-like grooves is a sealing weir, and an annular sealing dam is arranged below the fish bone-like grooves. The fishbone-like dry gas sealing structure adopted by the invention can rotate in two directions, and has the advantages of strong opening capability, uniform end surface pressure distribution, low end surface temperature, small leakage and strong stability.
Furthermore, the fishbone-like groove is symmetrical about the central axis, is suitable for the working condition of bidirectional rotation, and has good sealing performance in both forward rotation and reverse rotation; the radial drainage groove is in a convergent shape, so that the dynamic pressure effect can be enhanced, and the lubrication state of the sealing end face is improved; a plurality of spiral groove structures are distributed in the fishbone-like groove along the radial direction, a plurality of high-pressure areas are formed in the radial direction, and compared with common dry gas sealing, the dynamic pressure effect is obviously enhanced, and the opening capacity is enhanced; when the sealing device rotates in a sealing mode, the forward spiral groove can form an obvious dynamic pressure effect, and the reverse spiral groove can return working media in a sealing gap to a high-pressure side, so that the leakage amount is reduced; the arc groove at the fish tail part can balance the circumferential pressure distribution of the sealing end face, reduce the force deformation influence and enhance the sealing stability;
furthermore, the arc groove between the adjacent spiral grooves of the two circumferentially adjacent fishbone-like grooves can ensure that the circumferential pressure of the sealing end surface is uniformly distributed, the influence of force deformation is reduced, and the sealing stability is enhanced; the circumferential flow of the gas in the arc groove enhances the damping effect of the end face and can reduce the leakage amount;
furthermore, the directional macropores arranged at the downstream of the spiral groove play a role in guiding flow, can adsorb solid particles and reduce the risk of seal damage;
furthermore, the sealing dam is provided with a microporous structure, so that solid particles can be adsorbed, heat exchange in a sealing inner diameter area is enhanced, the temperature of a sealing end face is reduced, and the influence of thermal deformation is reduced;
furthermore, the ball socket/spherical convex heat exchange structure is arranged on the outer diameter of the sealing ring, so that the heat exchange of the sealing ring is enhanced, the temperature of the sealing end face is reduced, and the influence of thermal deformation is reduced;
furthermore, parameters of each spiral groove can be flexibly adjusted to adapt to different working conditions.
In conclusion, the fishbone-like dry gas sealing structure can obviously improve the opening capability of the sealing end face, reduce the temperature of the end face, reduce the leakage amount, improve the stability and reduce the deformation of the sealing end face, and is suitable for occasions of forward rotation or reverse rotation.
Drawings
Fig. 1 is a schematic view of a fishbone-like dry gas sealing structure of the invention.
FIG. 2 is a diagram of the shape of the fishbone-like groove of the invention.
Fig. 3 is a sectional view of the equal-depth fish-bone-imitating groove of the invention.
FIG. 4 is a sectional view of the fish bone-shaped groove of the present invention.
Fig. 5 is a sectional view of the tapered unequal-depth fish-bone-imitating groove of the invention.
FIG. 6 is a schematic view of a linear drainage groove of the present invention.
FIG. 7 is a schematic view of a circular arc of a drainage groove of the present invention.
FIG. 8 is a schematic view of a spiral drainage groove of the present invention.
FIG. 9 is a schematic view of the wave-shaped drainage grooves of the present invention.
FIG. 10 is a schematic view of the directional macro-apertures of the present invention.
FIG. 11 is a schematic view of a microwell of the present invention.
FIG. 12 is a schematic view of the outer diameter arrangement of the sealing ring of the present invention with a ball and socket/bulb configuration.
Fig. 13 is a schematic view of the arrangement of the ball sockets/knobs in a row.
Fig. 14 is a schematic view of a staggered ball socket/bulb arrangement.
Fig. 15 is a schematic view of a ball socket/bulb.
Fig. 16 is a schematic view of an ellipsoidal ball socket/bulb.
Fig. 17 is a schematic view of a teardrop shaped ball and socket/bulb.
In the figure: the heat exchanger is characterized in that the heat exchanger is provided with a radial drainage groove 1, a forward spiral groove 2, a reverse spiral groove 3, a sealing weir 4, an arc groove 5, a directional large hole 6, a fish tail combined groove 7, a sealing dam 8, a micropore 9, a ball socket/spherical convex heat exchange structure 10, a first spiral line 21, a first arc line 22, a second arc line 23, a second spiral line 31, a third arc line 32, a fourth arc line 33, an elliptical large hole 61, a rhombic large hole 62, a fifth arc line 71, a third spiral line 72, a sixth arc line 73, a fourth spiral line 74, a seventh arc line 75, a circular micropore 91, an elliptical micropore 93, a rhombic micropore 94, a square micropore 101, a first arc line 102, a second arc line 103, a first straight line 104 and a second straight line 104.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. It should not be understood that the scope of the above-described subject matter of the present invention is limited to the following. Various substitutions and alterations according to the knowledge and routine of those skilled in the art are intended to be included within the scope of the present invention without departing from the spirit and scope of the present invention as defined by the appended claims.
Referring to fig. 1, the fish bone-like dry gas sealing structure provided by the invention comprises a moving ring and a static ring. The outside diameter side of the end faces of the moving ring and the static ring is a sealing inlet, namely a high-pressure side, and the inside diameter side is a sealing outlet, namely a low-pressure side. The high-pressure side on at least one end surface of the movable ring and the static ring is periodically provided with fish bone-like grooves along the circumferential direction. The fishbone-like groove is composed of a radial drainage groove 1, a forward spiral groove 2, a reverse spiral groove 3 and a fishtail combination groove 7. The radial drainage groove 1 is converged along the radial direction, is connected with the forward spiral groove 2, the reverse spiral groove 3 and the 'fishtail' combined groove 7, and is symmetrical about the central axis. The forward spiral groove 2 and the reverse spiral groove 3 are increased and then reduced along the radial direction from a high pressure area to a low pressure area, and the spiral groove in the middle of the sealing end face is the largest. The fish tail combination groove 7 is composed of a spiral groove and an arc groove which are symmetrical about a central axis. The adjacent spiral grooves of the circumferentially adjacent fishbone-like grooves are connected by arc grooves 5. The downstream positions of the forward spiral groove 2 and the reverse spiral groove 3 are provided with directional large holes 6. The non-perforated area between the circumferentially adjacent fish bone-like grooves is a sealing weir 4, and an annular sealing dam 8 is arranged below the fish bone-like grooves. The sealing dam 8 is provided with micropores 9.
Referring to fig. 2, the fishbone-like groove comprises a radial drainage groove 1, a forward spiral groove 2, a reverse spiral groove 3 and a fish tail combination groove 7. The profile of the forward spiral groove 2 is formed by a first helical line 21, a first circular arc line 22 and a second circular arc line 23. Correspondingly, the profile of the reverse spiral groove 3 is formed by a second spiral line 31, a third circular arc line 32 and a fourth circular arc line 33. The contour of the fishtail combination groove 7 is composed of a fifth circular arc line 71, a third spiral line 72, a sixth circular arc line 73, a fourth spiral line 74 and a seventh circular arc line 75. Further, referring to fig. 3, 4 and 5, the fishbone-like groove may be configured in different types, such as a constant depth groove, a step-shaped non-constant depth groove, a cone-shaped non-constant depth groove, etc.
Referring to FIG. 6, linear radial drainage groove 1 is formed by a first arc 101, a second arc 102, a first straight line 103, and a second straight line 104. Wherein the first line 103 and the second line 104 are symmetrical with respect to the central axis. Referring to fig. 7, 8 and 9, the radial drainage groove profiles can also be arranged in other patterns, such as circular arc drainage grooves, spiral drainage grooves and wave drainage grooves.
Referring to fig. 10, the directional macro-apertures 6 may be in the form of oval macro-apertures 61, diamond macro-apertures 62, etc.
Referring to fig. 11, the micro holes 9 may be selected from the group consisting of circular micro holes 91, oval micro holes 92, diamond micro holes 93, and square micro holes 94.
Referring to fig. 12, the outer diameter surface of the sealing ring is provided with a ball and socket/bulb heat exchange structure 10. Referring to fig. 13, 14, 15, 16 and 17, the ball and socket/convex heat exchange structure 10 may have different arrangement and shapes, the arrangement may be in a row or in a staggered row, and the shape may be a spherical shape, an ellipsoidal shape, a teardrop shape, etc.
The working principle of the invention is as follows:
under the working state, the sealing working medium flows into the sealing end face from the high-pressure area on the outer diameter side, the sealing working medium is rapidly introduced into the end face under the drainage action of the radial drainage grooves 1, and the convergence structure generates a strong compression effect on the sealing working medium. As the rotating ring rotates, the sealing working medium enters the forward spiral groove 2 of each step by step along the radial direction, is compressed, the pressure rises rapidly, and a plurality of high-pressure areas are formed on the sealing end face. The reverse spiral groove 3 returns part of gas at the downstream of the seal to the high-pressure side, and the leakage amount is reduced. The arc groove 5 between the roots of the adjacent spiral grooves of the two circumferentially adjacent fishbone-like grooves enables the circumferential pressure distribution of the end face to be more uniform, and the lubrication condition of the end face is improved. The directional micropores at the downstream of the spiral groove 5 play a role of drainage and can adsorb solid particles in gas. The combined structure of the fish tail combination groove 7 and the arc groove 5 of the fish bone-shaped groove further evenly distributes the end face pressure. And sealing the microporous structure arranged in the dam region to further adsorb solid particles and cool the sealing end face.
Claims (4)
1. A fishbone-like dry gas sealing structure is characterized by comprising a movable ring and a static ring; the outer diameter side of the end faces of the moving ring and the static ring is a sealing inlet, namely a high-pressure side, and the inner diameter side of the end faces of the moving ring and the static ring is a sealing outlet, namely a low-pressure side; a plurality of fishbone-like grooves are uniformly distributed on the high-pressure side of at least one end surface of the movable ring and the static ring along the circumferential direction; a non-hole area between two circumferentially adjacent fish bone-like grooves is a sealing weir (4), and an annular sealing dam (8) is arranged below the fish bone-like grooves;
each fishbone-imitating groove comprises a radial drainage groove (1), and a forward spiral groove (2), a reverse spiral groove (3) and a fishtail combined groove (7) which are connected with the radial drainage groove (1); the radial drainage groove (1) is converged along the radial direction, the forward spiral groove (2) and the reverse spiral groove (3) are symmetrical about the central axis of the radial drainage groove (1) and are connected to two sides of the radial drainage groove (1), the forward spiral groove (2) and the reverse spiral groove (3) are increased from a high-pressure area to a low-pressure area along the radial direction and then decrease in variation trend, and the spiral groove in the middle of the sealing end surface is the largest; the fish tail combined groove (7) is symmetrical about the central axis of the radial drainage groove (1); adjacent spiral grooves of two circumferentially adjacent fishbone-like grooves are connected through an arc groove (5); the downstream positions of the forward spiral groove (2) and the reverse spiral groove (3) are provided with directional macropores (6), and the directional macropores (6) are elliptical macropores (61) or rhombic macropores (62); the sealing dam (8) is uniformly provided with a plurality of micropores (9);
the profile of the radial drainage groove (1) comprises a first arc line (101), a first straight line (103), a second arc line (102) and a second straight line (104) which are sequentially connected, and the first straight line (103) and the second straight line (104) are symmetrical about a central axis;
the profile of the forward spiral groove (2) comprises a first arc line (22), a first spiral line (21) and a second arc line (23) which are connected in sequence, and the profile of the reverse spiral groove (3) comprises a third arc line (32), a second spiral line (31) and a fourth arc line (33) which are connected in sequence; the profile of the fishtail combined groove (7) comprises a fifth arc line (71), a third spiral line (72), a sixth arc line (73), a fourth spiral line (74) and a seventh arc line (75) which are connected in sequence;
the outer diameter surface of the sealing structure is uniformly provided with a plurality of ball socket/ball convex heat exchange structures (10).
2. The fishbone-like dry gas seal structure of claim 1, wherein the fishbone-like groove is a constant depth groove, a step-like non-constant depth groove or a cone angle convergent non-constant depth groove.
3. The fish bone-like dry gas sealing structure according to claim 1, wherein the micropores (9) are round micropores (91), oval micropores (92), diamond micropores (93) or square micropores (94).
4. The fishbone-like dry gas sealing structure of claim 1, wherein the ball socket/ball-convex heat exchange structures (10) are arranged in a staggered manner, and are spherical, ellipsoidal or teardrop-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810368239.2A CN108506494B (en) | 2018-04-23 | 2018-04-23 | Fish bone-like dry gas sealing structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810368239.2A CN108506494B (en) | 2018-04-23 | 2018-04-23 | Fish bone-like dry gas sealing structure |
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| CN108506494A CN108506494A (en) | 2018-09-07 |
| CN108506494B true CN108506494B (en) | 2020-03-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112334690B (en) | 2018-08-01 | 2023-02-28 | 伊格尔工业股份有限公司 | Sliding assembly |
| EP3842673A4 (en) | 2018-08-24 | 2022-05-04 | Eagle Industry Co., Ltd. | Sliding member |
| CN109185461A (en) * | 2018-10-26 | 2019-01-11 | 清华大学 | The seal face structure of rotating machinery |
| WO2020110922A1 (en) | 2018-11-30 | 2020-06-04 | イーグル工業株式会社 | Sliding component |
| US11821521B2 (en) | 2018-12-21 | 2023-11-21 | Eagle Industry Co., Ltd. | Sliding component |
| CN109538762A (en) * | 2019-01-14 | 2019-03-29 | 东营海森密封技术有限责任公司 | A kind of shaft end mechanical seal structure |
| CN113439167B (en) * | 2019-02-04 | 2023-06-02 | 伊格尔工业股份有限公司 | Sliding member |
| US11933405B2 (en) | 2019-02-14 | 2024-03-19 | Eagle Industry Co., Ltd. | Sliding component |
| EP3929454A4 (en) * | 2019-02-21 | 2022-11-16 | Eagle Industry Co., Ltd. | Sliding component |
| EP4345342A2 (en) | 2019-07-26 | 2024-04-03 | Eagle Industry Co., Ltd. | Sliding component |
| CN110578801A (en) * | 2019-09-29 | 2019-12-17 | 西安石油大学 | Anchor-shaped dry gas sealing device |
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| RU2177572C2 (en) * | 2000-11-20 | 2001-12-27 | ООО "Самаратрансгаз" | Contact-free end sealing (variants) |
| CN1364987A (en) * | 2001-01-18 | 2002-08-21 | 王玉明 | Spiral groove end sealer capable of being rotated in both directions |
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