CN215861732U - End face dry gas sealing structure - Google Patents
End face dry gas sealing structure Download PDFInfo
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- CN215861732U CN215861732U CN202122009020.3U CN202122009020U CN215861732U CN 215861732 U CN215861732 U CN 215861732U CN 202122009020 U CN202122009020 U CN 202122009020U CN 215861732 U CN215861732 U CN 215861732U
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- 238000007789 sealing Methods 0.000 title claims abstract description 125
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- 230000003068 static effect Effects 0.000 claims description 12
- 230000001788 irregular Effects 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract description 8
- 230000017525 heat dissipation Effects 0.000 description 5
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Abstract
The utility model discloses an end face dry gas sealing structure which comprises a movable ring and a fixed ring, wherein at least one sealing end face in two sealing end faces between the movable ring and the fixed ring is a slotted sealing end face provided with a plurality of dragonfly-imitated wing-shaped grooves, a non-slotted region between adjacent dragonfly-imitated wing-shaped grooves in the outer diameter side of the slotted sealing end face forms a sealing weir, and a non-slotted annular region on the inner diameter side of the slotted sealing end face forms a sealing dam; a dragonfly wing-shaped groove comprises: the artificial dragonfly wing-shaped groove comprises a main vein groove and a plurality of branch vein grooves, wherein the main vein groove is positioned on the windward side of the artificial dragonfly wing-shaped groove and extends from the outer diameter side to the inner diameter side, the branch vein grooves are communicated with the main vein groove at an angle and are sequentially arranged at intervals along the radial direction, the roots of the main vein groove and the branch vein grooves are all intersected in the same molded line groove, and a grid groove is arranged in an area formed by the main vein groove, the branch vein groove, the molded line groove and the outer diameter end of the grooved sealing end surface. The utility model has the advantages of large end face opening force, vibration resistance and abrasion resistance.
Description
Technical Field
The utility model relates to the technical field of rotary non-contact dry gas sealing equipment, in particular to a dragonfly wing-imitating type groove end face dry gas sealing structure suitable for shaft end sealing of rotary machinery rotating shafts of various compressors, pumps, kettle stirrers and the like.
Background
At present, the non-contact dry gas seal is more and more widely applied in the fields of petroleum, petrifaction, chemical industry, metallurgy and the like with the advantages of low abrasion, high reliability and the like, the non-contact dry gas seal and the contact mechanical seal have no great difference on structure, and the non-contact dry gas seal also comprises a movable ring, a static ring, a spring and the like; the difference lies in that the end face of the moving ring is provided with a pneumatic dynamic pressure groove, the sealing end face of the groove of the moving ring is divided into two functional areas, namely an outer area and an inner area, the outer area is composed of the dynamic pressure groove and a sealing weir, and the inner area is also called a sealing dam and is a plane part of the moving ring. During operation, the moving ring rotates with the rotor, gas is introduced into the dynamic pressure groove, the gas introduced into the groove is compressed and blocked by the sealing weir, the pressure is further increased, the pressure overcomes the spring force behind the static ring and the fluid pressure acting on the static ring to push the static ring away, the contact surface between the moving ring and the static ring is separated to form a stable dynamic pressure gas film, the gas film provides sufficient lubrication and cooling for the end surfaces of the moving ring and the static ring, a certain sealing gap is kept between the sealing end surfaces by the gas film, and the gas medium is decompressed under the action of throttling and blocking when passing through the sealing gap, so that the sealing of the gas medium is realized.
The typical representatives of the sealing production enterprises are three international companies such as John Crane, Flownerve and Burgmann, domestic dry gas sealing backbone enterprises such as China dense control capital and Chengdu Tong, and the most difference of the products is the end face type groove. A large number of scientific researchers at home and abroad carry out series research on various types of grooves of non-contact dry gas sealing end faces for a long time, and invent various types of grooves (such as U.S. patents: US9239061, US8061984, US7144016, US9080612B2, US 9151390B2 and the like, and Chinese patents: CN201320637751.5, CN201210076971.5, CN201210057985.2, CN201420010332.3, CN201510580854.6 and the like), and a plurality of bionic groove dry gas seals (CN 201811286179.6, CN201710760403.X, CN201710748374.5, CN201710559577.X and the like) are invented by Pengxudong and the like, Zhejiang industrial university, based on bionic engineering. However, along with the development of the turbomachinery for the process industry to the high parameter working condition, besides the requirement of the leakage rate, the anti-interference property and the anti-vibration property of the dry gas seal are particularly required to be strong, but the anti-interference property and the bearing capacity of the non-contact dry gas seal of different groove end faces disclosed by the domestic patent are not strong, the anti-vibration property is weak, the bearing capacity of the gas film is not strong or the opening force of the end face is not ideal, so that the problems of end face gas film cracking, end face abrasion and the like are easily caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an end face dry gas sealing structure which can provide large end face opening force, has strong vibration resistance and high stability, and has strong heat dissipation capability and abrasion resistance.
In order to achieve the purpose, the utility model adopts the following technical scheme: terminal surface dry gas seal structure, including the rotating ring and the quiet ring of dry gas seal usefulness, its characterized in that: at least one of two opposite sealing end surfaces between the movable ring and the static ring is a slotted sealing end surface, a plurality of dragonfly-imitating wing-fin type grooves are circumferentially arranged on the outer diameter side of the slotted sealing end surface, a sealing weir is formed in an ungrooved area between adjacent dragonfly-imitating wing-fin type grooves in the outer diameter side of the slotted sealing end surface, and a sealing dam is formed in an ungrooved annular area on the inner diameter side of the slotted sealing end surface; the imitative dragonfly wing type groove includes: the artificial dragonfly wing-shaped groove comprises a main vein groove and a plurality of branch vein grooves, wherein the main vein groove is located on the windward side of an artificial dragonfly wing-shaped groove and extends from the outer diameter side to the inner diameter side of a groove sealing end face, the branch vein grooves are communicated with the main vein groove at an angle, the branch vein grooves are arranged at intervals along the radial direction, the roots of the main vein groove and the roots of all the branch vein grooves are intersected in the same molded line groove, a grid groove is arranged in an area formed by the main vein groove, the branch vein grooves, the molded line grooves and the outer diameter end of the groove sealing end face together, and the grid groove is communicated with the main vein groove and the branch vein groove at the same time.
Further, the aforesaid terminal surface dry gas seal structure, wherein: the shape of the molded line groove of the dragonfly-imitating wing-shaped groove is a logarithmic spiral line or an Archimedes spiral line or a circular arc line or a parabola line.
Further, the aforesaid terminal surface dry gas seal structure, wherein: the profile line groove shape of the dragonfly-like wing-shaped groove is a straight line, and the linear profile line groove, the main vein groove and the triangle formed by the outer diameter ends of the grooved sealing end surface are isosceles triangles or right-angled triangles.
Further, the aforesaid terminal surface dry gas seal structure, wherein: the grid shape of the grid groove is polygonal.
Further, the aforesaid terminal surface dry gas seal structure, wherein: the appearance of the grids in the dragonfly wing-shaped groove is orderly a regular close-packed quadrangle, a hexagon and an irregular sparse quadrangle from the windward side to the leeward side.
Further, the aforesaid terminal surface dry gas seal structure, wherein: the appearance of the grids in the dragonfly wing-shaped groove is a regular close-packed quadrangle, a hexagon and a random sparse quadrangle from the outer diameter side to the inner diameter side.
Further, the aforesaid terminal surface dry gas seal structure, wherein: the shape of the grid groove is triangular, quadrangular or hexagonal.
Further, the aforesaid terminal surface dry gas seal structure, wherein: the depth of the profile groove of the dragonfly-like wing-shaped profile groove becomes shallow gradually from the windward side to the leeward side along the circumferential direction and becomes shallow gradually from the outer diameter side to the inner diameter side.
Further, the aforesaid terminal surface dry gas seal structure, wherein: the depth range of the dragonfly-like wing-shaped groove is 1-30 mu m, wherein the depth range of the main vein groove is 5-30 mu m, the depth range of the branch vein groove is 5-30 mu m, and the depth range of the molded line groove is 1-5 mu m.
Through the implementation of the technical scheme, the utility model has the beneficial effects that: (1) the end face dry gas sealing structure is provided based on a special grid 'wing eye' structure of a dragonfly wing, the unique bionic structure can provide large end face opening force, and is beneficial to eliminating or alleviating air film rupture and strong vibration, so that the dragonfly wing has strong vibration resistance and high stability, and meanwhile, the heat dissipation capacity of the end face can be improved and the influence generated by gas condensation is eliminated or slowed down by the reasonable arrangement of the branch vessel grooves; the utility model is suitable for the shaft end dry gas sealing of turbomachines with different rotating speeds, is particularly suitable for high-speed occasions, and has the characteristics of vibration resistance, low leakage, strong convection heat exchange and high gas film rigidity;
(2) the main vein groove of the dragonfly-like wing-shaped groove is positioned at the windward side or the front edge of the dragonfly-like wing-shaped groove, plays a role of drainage on the end surface, introduces a sealing gas medium at the outer diameter side into the end surface, pumps the sealing gas medium to the inner diameter side along with gas flow, generates larger gas pressure rising amplitude, and reaches the maximum value at the position close to a sealing dam, thereby generating partial end surface opening force; meanwhile, the branch groove quickly guides the airflow introduced by the main groove to different radial positions of each dragonfly-like wing-shaped groove, so that the opening force of the end surface is further increased;
(3) grid grooves with different sizes and depths are distributed between the main vein groove and the branch vein groove of the dragonfly-like wing-shaped groove, and the dragonfly-like wing-shaped groove has the following main effects: the airflow flowing in the branch channel is more quickly distributed on the end face, and when the dry air seal is disturbed by the outside to generate vibration, the distribution of the airflow in the dragonfly-like wing-shaped groove and the pressure value and the speed value of the airflow are changed to play a role of vibration absorption, particularly the vibration of the dry air seal at high speed is eliminated, and the dragonfly-like wing-shaped groove has strong vibration resistance; meanwhile, the trend of the branch groove determines different dry gas sealing design requirements, if the branch groove extends from the windward side to the leeward side to the outer diameter side, the branch groove plays a role of pumping on the outer diameter side, the end face opening force is improved, meanwhile, the leakage effect can be reduced, if the branch groove extends from the windward side to the leeward side to the inner diameter side, the branch groove can further increase the end face opening force, and the capacity of improving the rigidity and stability of a dry gas sealing gas film is improved; in addition, the grid grooves (air flow in the grooves) not only play a role in absorbing vibration, but also play a role in strengthening heat and mass transfer, so that the heat dissipation capability is strong, the problem of local condensation of a high-pressure dry gas seal air film can be relieved, and the working stability of dry gas seal is further improved; compared with the traditional dry gas seal with the spiral groove end face, the grid groove has strong capability of independently absorbing abrasive particles, and can effectively prevent the condition that the abrasion of the sealing surface is caused by the high-speed rotational flow of the particles in the large spiral groove, so that the abrasion can be reduced to the maximum extent, and the service life of dry gas seal is effectively prolonged.
Drawings
Fig. 1 is a schematic structural diagram of an end face dry gas sealing structure according to a first embodiment of the present invention.
Fig. 2 is a schematic structural view of a grooved seal end face of the rotating ring in fig. 1.
Fig. 3 is an enlarged structural schematic view of the dragonfly-imitating wing-shaped groove in fig. 2.
Fig. 4 is a schematic structural view of a grooved seal end face of a stationary ring in the end face dry gas seal structure according to the second embodiment of the present invention.
Fig. 5 is an enlarged structural schematic view of the dragonfly-imitating wing-shaped groove in fig. 4.
Fig. 6 is a schematic structural view of a grooved seal end face of a moving ring in an end face dry gas seal structure according to a third embodiment of the present invention.
Fig. 7 is an enlarged structural schematic view of the dragonfly-imitating wing-shaped groove in fig. 6.
Fig. 8 is an enlarged structural view of the grid grooves in fig. 7.
Fig. 9 is a schematic structural view of a grooved seal end face of a stationary ring in the end face dry gas seal structure according to the third embodiment of the present invention.
Fig. 10 is an enlarged structural schematic view of the dragonfly-imitating wing-shaped groove in fig. 9.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example one
As shown in fig. 1, 2, and 3, the end face dry gas sealing structure includes a moving ring 1 and a stationary ring 2 for dry gas sealing, at least one of two opposite sealing end faces between the moving ring 1 and the stationary ring 2 is a grooved sealing end face, in this embodiment, the sealing end face of the moving ring is a grooved sealing end face, and the sealing end face of the stationary ring is a non-grooved sealing end face; a plurality of dragonfly-imitating wing-shaped grooves 3 are circumferentially arranged on the outer diameter side of the slotted sealing end surface of the movable ring 1, a sealing weir 4 is formed in an ungrooved area between the adjacent dragonfly-imitating wing-shaped grooves 3 in the outer diameter side of the slotted sealing end surface, and a sealing dam 5 is formed in an ungrooved annular area on the inner diameter side of the slotted sealing end surface; the dragonfly-imitating wing-shaped groove 3 comprises: the main vein groove 31 is positioned on the windward side of the dragonfly-imitated wing-shaped groove 3 and extends from the outer diameter side to the inner diameter side of the slotting sealing end face, the three branch vein grooves 32 are communicated with the main vein groove 31 at an angle, the three branch vein grooves 32 are sequentially arranged at intervals along the radial direction, the root of the main vein groove 31 and the roots of all the branch vein grooves 32 are intersected with the same molded line groove 33, the main vein groove 31, the molded line grooves 33 and the outer diameter end of the slotting sealing end face jointly form a dragonfly wing profile, a grid groove 34 is arranged in an area jointly formed by the main vein groove 31, the branch vein grooves 32, the molded line grooves 33 and the outer diameter end of the slotting sealing end face, and the grid groove 34 is communicated with the main vein groove 31 and the branch vein grooves 32; the shape of the molded line groove of the dragonfly-imitated wing-shaped groove is a logarithmic spiral line or an Archimedes spiral line or a circular arc line or a parabola line; in the embodiment, the shape of the molded line groove of the dragonfly-like wing-shaped groove is a logarithmic spiral line; the shape of the lattice of the grid groove 34 is polygonal such as triangle, quadrangle or hexagon, in the embodiment, the shape of the lattice of the grid groove 34 is hexagonal, and the air resistance of the hexagon is the minimum in comparison with other polygons under most working conditions and environmental conditions, so that the dry gas seal is suitable for the running occasions of near ultra-high speed (80-100 m/s) or ultra-high speed (more than or equal to 100 m/s); in the embodiment, the depth 33 of the profile groove of the dragonfly-like wing-shaped groove 3 gradually becomes shallow along the circumferential direction from the windward side to the leeward side and gradually becomes shallow from the outer diameter side to the inner diameter side, the depth range of the dragonfly-like wing-shaped groove 3 is 1-30 mu m, the depth range of the main vessel groove 31 is 5-30 mu m, the depth range of the branch vessel groove is 5-30 mu m, and the depth range of the molded line groove is 1-5 mu m.
Detailed description of the utility model
As shown in fig. 4 and 5, the end face dry gas sealing structure includes a moving ring 1 and a stationary ring 2 for dry gas sealing, at least one of two opposite sealing end faces between the moving ring 1 and the stationary ring 2 is a grooved sealing end face, in this embodiment, the sealing end face of the moving ring 1 is a non-grooved sealing end face, and the sealing end face of the stationary ring 2 is a grooved sealing end face; a plurality of dragonfly-imitating wing-shaped grooves 3 are circumferentially arranged on the outer diameter side of the slotted sealing end surface of the static ring 2, a sealing weir 4 is formed in an ungrooved area between the adjacent dragonfly-imitating wing-shaped grooves 3 in the outer diameter side of the slotted sealing end surface, and a sealing dam 5 is formed in an ungrooved annular area on the inner diameter side of the slotted sealing end surface; the dragonfly-imitating wing-shaped groove 3 comprises: the main vein groove 31 is positioned on the windward side of the dragonfly-imitated wing-shaped groove 3 and extends from the outer diameter side to the inner diameter side of the slotting sealing end face, the three branch vein grooves 32 are communicated with the main vein groove 31 at an angle, the three branch vein grooves 32 are sequentially arranged at intervals along the radial direction, the root of the main vein groove 31 and the roots of all the branch vein grooves 32 are intersected with the same molded line groove 33, the main vein groove 31, the molded line grooves 33 and the outer diameter end of the slotting sealing end face jointly form a dragonfly wing profile, a grid groove 34 is arranged in an area jointly formed by the main vein groove 31, the branch vein grooves 32, the molded line grooves 33 and the outer diameter end of the slotting sealing end face, and the grid groove 34 is communicated with the main vein groove 31 and the branch vein grooves 32; the shape of the molded line groove of the dragonfly-imitated wing-shaped groove is a logarithmic spiral line or an Archimedes spiral line or a circular arc line or a parabola line; in the embodiment, the shape of the molded line groove of the dragonfly-like wing-shaped groove is a logarithmic spiral line; in the embodiment, the lattice shapes of the grid grooves 34 in the dragonfly-like wing-shaped groove 3 are regular close-packed quadrangles, hexagons and irregular sparse quadrangles from the windward side to the leeward side in sequence; in the embodiment, the depth of the profile groove of the dragonfly-like wing-shaped profile groove 3 gradually becomes shallow from the windward side to the leeward side along the circumferential direction and gradually becomes shallow from the outer diameter side to the inner diameter side, the depth range of the dragonfly-like wing-shaped profile groove 3 is 1-30 mu m, the depth range of the main vein groove 31 is 5-30 mu m, the depth range of the branch vein groove 32 is 5-30 mu m, and the depth range of the molded line groove 33 is 1-5 mu m; in the implementation application, for high-speed turbomachinery (more than or equal to 5000 rpm), when parameters such as speed and pressure are high and the speed is considered to be dominant during design, the structure of the embodiment is recommended.
Detailed description of the preferred embodiment
As shown in fig. 6, 7, 8, 9, and 10, the end face dry gas sealing structure includes a moving ring 1 and a stationary ring 2 for dry gas sealing, at least one of two opposite sealing end faces between the moving ring 1 and the stationary ring 2 is a grooved sealing end face, in this embodiment, the sealing end face of the moving ring 1 is a grooved sealing end face, and the sealing end face of the stationary ring 2 is also a grooved sealing end face; a plurality of dragonfly-imitating wing-shaped grooves 3 are circumferentially arranged on the outer diameter sides of the slotted sealing end surfaces of the movable ring 1 and the static ring 2, a sealing weir 4 is formed in an ungrooved area between the adjacent dragonfly-imitating wing-shaped grooves 3 in the outer diameter side of the slotted sealing end surface, and a sealing dam 5 is formed in an ungrooved annular area on the inner diameter side of the slotted sealing end surface; the dragonfly-imitating wing-shaped groove 3 comprises: the main vein groove 31 is positioned on the windward side of the dragonfly-imitated wing-shaped groove 3 and extends from the outer diameter side to the inner diameter side of the slotting sealing end face, the three branch vein grooves 32 are communicated with the main vein groove 31 at an angle, the three branch vein grooves 32 are sequentially arranged at intervals along the radial direction, the root of the main vein groove 31 and the roots of all the branch vein grooves 32 are intersected with the same molded line groove 33, the main vein groove 31, the molded line grooves 33 and the outer diameter end of the slotting sealing end face jointly form a dragonfly wing profile, a grid groove 34 is arranged in an area jointly formed by the main vein groove 31, the branch vein grooves 32, the molded line grooves 33 and the outer diameter end of the slotting sealing end face, and the grid groove 34 is communicated with the main vein groove 31 and the branch vein grooves 32; the dragonfly-imitating wing-shaped groove is in a shape of a logarithmic spiral line or an Archimedes spiral line or a circular arc line or a parabola line, and in the embodiment, the dragonfly-imitating wing-shaped groove is in a shape of a logarithmic spiral line; in the present embodiment, the lattice shape of the grid grooves 34 in the dragonfly-like wing-shaped groove 3 is a regular close-packed quadrangle, a hexagon and a random open-packed quadrangle in sequence from the outer diameter side to the inner diameter side; in the embodiment, the depth of the profile groove of the dragonfly-like wing-shaped groove 3 gradually becomes shallow along the circumferential direction from the windward side to the leeward side and gradually becomes shallow from the outer diameter side to the inner diameter side, the depth range of the dragonfly-like wing-shaped groove 3 is 1-30 mu m, the depth range of the main vessel groove 31 is 5-30 mu m, the depth range of the branch vessel groove 32 is 5-30 mu m, and the depth range of the molded line groove 33 is 1-5 mu m. In the implementation application, for a high-speed turbomachine, when parameters such as speed and pressure are high and medium pressure is considered to be dominant in design, the structure of the embodiment is recommended.
Detailed description of the utility model
An end face dry gas sealing structure comprises a moving ring 1 and a static ring 2 for dry gas sealing, wherein at least one sealing end face of two opposite sealing end faces between the moving ring 1 and the static ring 2 is a slotted sealing end face; a plurality of dragonfly-imitating wing-shaped grooves 3 are circumferentially arranged on the outer diameter side of the slotted sealing end surface of the movable ring 1, a sealing weir 4 is formed in an ungrooved area between the adjacent dragonfly-imitating wing-shaped grooves 3 in the outer diameter side of the slotted sealing end surface, and a sealing dam 5 is formed in an ungrooved annular area on the inner diameter side of the slotted sealing end surface; the dragonfly-imitating wing-shaped groove 3 comprises: the main vein groove 31 is positioned on the windward side of the dragonfly-imitated wing-shaped groove 3 and extends from the outer diameter side to the inner diameter side of the slotting sealing end face, the three branch vein grooves 32 are communicated with the main vein groove 31 at an angle, the three branch vein grooves 32 are sequentially arranged at intervals along the radial direction, the root of the main vein groove 31 and the roots of all the branch vein grooves 32 are intersected with the same molded line groove 33, the main vein groove 31, the molded line grooves 33 and the outer diameter end of the slotting sealing end face jointly form a dragonfly wing profile, a grid groove 34 is arranged in an area jointly formed by the main vein groove 31, the branch vein grooves 32, the molded line grooves 33 and the outer diameter end of the slotting sealing end face, and the grid groove 34 is communicated with the main vein groove 31 and the branch vein grooves 32; the shape of the molded line groove of the dragonfly-imitating wing-shaped groove is a logarithmic spiral line or an Archimedes spiral line or an arc line or a parabola line or a straight line, in the embodiment, the shape of the molded line groove 33 of the dragonfly-imitating wing-shaped groove 3 is a straight line, and triangles formed by the linear molded line groove 33, the main pulse groove 31 and the outer diameter end of the grooved sealing end surface are isosceles triangles or right-angled triangles; (ii) a The shape of the lattice groove 34 is a polygon such as a triangle, a quadrangle or a hexagon, in this embodiment, the shape of the lattice groove 34 is a hexagon; in the embodiment, the depth 33 of the profile groove of the dragonfly-like wing-shaped groove 3 gradually becomes shallow along the circumferential direction from the windward side to the leeward side and gradually becomes shallow from the outer diameter side to the inner diameter side, the depth range of the dragonfly-like wing-shaped groove 3 is 1-30 mu m, the depth range of the main vessel groove 31 is 5-30 mu m, the depth range of the branch vessel groove is 5-30 mu m, and the depth range of the molded line groove is 1-5 mu m.
The utility model has the advantages that: (1) the end face dry gas sealing structure is provided based on a special grid 'wing eye' structure of a dragonfly wing, the unique bionic structure can provide large end face opening force, and is beneficial to eliminating or alleviating air film rupture and strong vibration, so that the dragonfly wing has strong vibration resistance and high stability, and meanwhile, the heat dissipation capacity of the end face can be improved and the influence generated by gas condensation is eliminated or slowed down by the reasonable arrangement of the branch vessel grooves; the utility model is suitable for the shaft end dry gas sealing of turbomachines with different rotating speeds, is particularly suitable for high-speed occasions, and has the characteristics of vibration resistance, low leakage, strong convection heat exchange and high gas film rigidity;
(2) the main vein groove of the dragonfly-like wing-shaped groove is positioned at the windward side or the front edge of the dragonfly-like wing-shaped groove, plays a role of drainage on the end surface, introduces a sealing gas medium at the outer diameter side into the end surface, pumps the sealing gas medium to the inner diameter side along with gas flow, generates larger gas pressure rising amplitude, and reaches the maximum value at the position close to a sealing dam, thereby generating partial end surface opening force; meanwhile, the branch groove quickly guides the airflow introduced by the main groove to different radial positions of each dragonfly-like wing-shaped groove, so that the opening force of the end surface is further increased;
(3) grid grooves with different sizes and depths are distributed between the main vein groove and the branch vein groove of the dragonfly-like wing-shaped groove, and the dragonfly-like wing-shaped groove has the following main effects: the airflow flowing in the branch channel is more quickly distributed on the end face, and when the dry air seal is disturbed by the outside to generate vibration, the distribution of the airflow in the dragonfly-like wing-shaped groove and the pressure value and the speed value of the airflow are changed to play a role of vibration absorption, particularly the vibration of the dry air seal at high speed is eliminated, and the dragonfly-like wing-shaped groove has strong vibration resistance; meanwhile, the trend of the branch groove determines different dry gas sealing design requirements, if the branch groove extends from the windward side to the leeward side to the outer diameter side, the branch groove plays a role of pumping on the outer diameter side, the end face opening force is improved, meanwhile, the leakage effect can be reduced, if the branch groove extends from the windward side to the leeward side to the inner diameter side, the branch groove can further increase the end face opening force, and the capacity of improving the rigidity and stability of a dry gas sealing gas film is improved; in addition, the grid grooves (air flow in the grooves) not only play a role in absorbing vibration, but also play a role in strengthening heat and mass transfer, so that the heat dissipation capability is strong, the problem of local condensation of a high-pressure dry gas seal air film can be relieved, and the working stability of dry gas seal is further improved; compared with the traditional dry gas seal with the spiral groove end face, the grid groove has strong capability of independently absorbing abrasive particles, and can effectively prevent the condition that the abrasion of the sealing surface is caused by the high-speed rotational flow of the particles in the large spiral groove, so that the abrasion can be reduced to the maximum extent, and the service life of dry gas seal is effectively prolonged.
The description is only intended to be an exemplification of the utility model, which is not intended to limit the utility model to the particular forms disclosed, but also to cover all equivalent technical means that can be conceived by one skilled in the art based on the teachings of the utility model.
Claims (9)
1. Terminal surface dry gas seal structure, including the rotating ring and the quiet ring of dry gas seal usefulness, its characterized in that: at least one of two opposite sealing end surfaces between the movable ring and the static ring is a slotted sealing end surface, a plurality of dragonfly-imitating wing-fin type grooves are circumferentially arranged on the outer diameter side of the slotted sealing end surface, a sealing weir is formed in an ungrooved area between adjacent dragonfly-imitating wing-fin type grooves in the outer diameter side of the slotted sealing end surface, and a sealing dam is formed in an ungrooved annular area on the inner diameter side of the slotted sealing end surface; the imitative dragonfly wing type groove includes: the artificial dragonfly wing-shaped groove comprises a main vein groove and a plurality of branch vein grooves, wherein the main vein groove is located on the windward side of an artificial dragonfly wing-shaped groove and extends from the outer diameter side to the inner diameter side of a groove sealing end face, the branch vein grooves are communicated with the main vein groove at an angle, the branch vein grooves are arranged at intervals along the radial direction, the roots of the main vein groove and the roots of all the branch vein grooves are intersected in the same molded line groove, a grid groove is arranged in an area formed by the main vein groove, the branch vein grooves, the molded line grooves and the outer diameter end of the groove sealing end face together, and the grid groove is communicated with the main vein groove and the branch vein groove at the same time.
2. The end face dry gas seal structure of claim 1, wherein: the grid shape of the grid groove is polygonal.
3. The end face dry gas seal structure of claim 2, wherein: the appearance of the grids in the dragonfly wing-shaped groove is orderly a regular close-packed quadrangle, a hexagon and an irregular sparse quadrangle from the windward side to the leeward side.
4. The end face dry gas seal structure of claim 2, wherein: the appearance of the grids in the dragonfly wing-shaped groove is a regular close-packed quadrangle, a hexagon and a random sparse quadrangle from the outer diameter side to the inner diameter side.
5. The end face dry gas seal structure of claim 2, wherein: the shape of the grid groove is triangular, quadrangular or hexagonal.
6. The end face dry gas seal structure of any one of claims 1 to 5, wherein: the shape of the molded line groove of the dragonfly-imitating wing-shaped groove is a logarithmic spiral line or an Archimedes spiral line or a circular arc line or a parabola line.
7. The end face dry gas seal structure of claim 6, wherein: the profile line groove shape of the dragonfly-like wing-shaped groove is a straight line, and the linear profile line groove, the main vein groove and the triangle formed by the outer diameter ends of the grooved sealing end surface are isosceles triangles or right-angled triangles.
8. The end face dry gas seal structure of claim 6, wherein: the depth of the profile groove of the dragonfly-like wing-shaped profile groove becomes shallow gradually from the windward side to the leeward side along the circumferential direction and becomes shallow gradually from the outer diameter side to the inner diameter side.
9. The end face dry gas seal structure of claim 8, wherein: the depth range of the dragonfly-like wing-shaped groove is 1-30 mu m, wherein the depth range of the main vein groove is 5-30 mu m, the depth range of the branch vein groove is 5-30 mu m, and the depth range of the molded line groove is 1-5 mu m.
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| CN202122009020.3U CN215861732U (en) | 2021-08-25 | 2021-08-25 | End face dry gas sealing structure |
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| CN202122009020.3U CN215861732U (en) | 2021-08-25 | 2021-08-25 | End face dry gas sealing structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669454A (en) * | 2021-08-25 | 2021-11-19 | 江苏金鹰流体机械有限公司 | End face dry gas sealing structure |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669454A (en) * | 2021-08-25 | 2021-11-19 | 江苏金鹰流体机械有限公司 | End face dry gas sealing structure |
| CN113669454B (en) * | 2021-08-25 | 2024-05-17 | 江苏金鹰流体机械有限公司 | End face dry gas sealing structure |
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