CN104154235A - Spiral distribution convergent micropore texture mechanical seal - Google Patents
Spiral distribution convergent micropore texture mechanical seal Download PDFInfo
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- CN104154235A CN104154235A CN201410191186.3A CN201410191186A CN104154235A CN 104154235 A CN104154235 A CN 104154235A CN 201410191186 A CN201410191186 A CN 201410191186A CN 104154235 A CN104154235 A CN 104154235A
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Abstract
A spiral distribution convergent micropore texture mechanical seal comprises a seal movable ring and a static ring, a sealing end face of at least one of the movable ring and the static ring is provided with convergent micropore textures distributed in a spiral mode, the textures are distributed on the whole sealing end face, or an annular dam area is arranged at the position close to the low-pressure side, center distribution lines of rows of micropores of the micropore textures are spiral lines, the micropore textures are convergent textures, when the outside of a sealing ring is a high-pressure side, the convergence direction of the micropores is opposite to the spreading direction of the spiral lines, and when the inner side of the sealing ring is a high-pressure side, the convergence direction of the micropores is the same as the spreading direction of the spiral lines. The mechanical seal effectively improves bearing capacity of the sealing end face so that the seal can be opened at a lower rotation speed, it is guaranteed that a lubrication film has larger rigidity on the condition of small film thickness and small pressure difference, and accordingly collision and friction during starting and stopping stages are reduced; the mechanical seal is suitable for gas and liquid media, friction of the seal is reduced, service life of the seal is prolonged and reliability of the seal is improved.
Description
Technical field
The invention belongs to the mechanical sealing technology field of running shaft, particularly Spiral distribution convergence type micropore texture mechanical seal.
Background technique
Surface Texture technology is widely used in antifriction and the drag reduction of friction pair, in mechanical seal field, is also successfully applied.Engineering practice shows that the antifriction function of Surface Texture can effectively improve wear resistance and the working life of seal face.
1996, Israel scholar Etsion proposed a kind of mechanical seal based on laser micropore technology at first, for the liquid shaft seal of pump class.In order to improve the dynamic pressure under dry gas seals and low speed operating mode of micropore texture, open the poor problem of ability, occurred successively that the end face texture of various new is to improve the action effect of surface micro-pores texture both at home and abroad.2007, patent CN101016949A disclosed a kind of micro-pore face mechanical seal structure of variation cloth, and the micropore of arranging and differing in size along Central Symmetry on seal face obtains more excellent resistance to pressure, wear resistance and convergence property; 2009, patent CN101672366A disclosed a kind of tilting directional microporous end surface mechanical sealing structure, used instead directional microporously, and made micropore long axis direction and end face diameter become the angle of inclination, obtained better hydrodynamic effect; 2010, patent 103090005A discloses the mechanical seal of a kind of Spiral distribution micro-pore face, on seal ring end face, be uniformly distributed vertically 10 to 20 spiral regions, and be uniformly distributed circular hole on each spiral region, thereby reduce friction torque, heat yield and fretting wear.These texture have effectively improved the opening force of sealing, and by the ability of microcellular structure holding solid particle, have extended the working life of sealing.But the fluid active and static pressure effect of these micropore texture is limited, can only under the operating mode of high rotating speed and little thickness, produce enough bearing capacities, in shutdown process, easy generation end face touches and rubs, and produces wearing and tearing, reliability and working life that impact seals.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide the mechanical seal of a kind of Spiral distribution convergence type micropore texture, it is the downstream pumping type mechanical seal device of the dynamic and static pressure combined type of a kind of fluid, under identical condition, there is larger fluid film thickness, or there is larger fluid film rigidity under identical fluid film thickness.
In order to achieve the above object, technological scheme of the present invention is:
The mechanical seal of Spiral distribution convergence type micropore texture, the rotating ring, the stationary ring that comprise mechanical seal, an end face of rotating ring and stationary ring is relative, form the seal face of ring, on at least one seal face of rotating ring and stationary ring, texture band is set, texture band is located on whole end face or close on high-tension side part end face; On texture band, arrange a series of micropore texture, the center of every row micropore texture distributes according to helix, the trend that is place, micropore texture center curve is approximate helix or approximate curve, skew lines, and when seal ring outside is high pressure, micropore convergence direction is contrary with helix expansion direction; When seal ring inner side is high pressure, micropore convergence direction is identical with helix expansion direction.
The pitch angle alpha will of described helix is defined as follows: establish smoothed curve (containing skew lines) from A point (or the A ' of the less inside radius of radius, A ") start, B point (or B ' to the larger outer radius place of radius, B ") till, the concentric circle at any radius R place between interior outer radius and this curve intersection are in P point (or P ', P "), curve is crossed P point (or P ', P ") tangent line (or straight line itself) and above-mentioned concentric circle cross P point (or P ', P ") tangent line between folded angle α be helix angle, the scope of the helix angle of distributing line is 0 ° of <| α | <90 °, pitch angle alpha will is constant or changes.
Each micropore of described micropore texture is convergence type shape downstream along upstream, the length in Length Ratio downstream that is micropore texture upstream side is large, along Spiral distribution line pore size from greatly to little variation and the large end of micropore towards high pressure side, micropore be shaped as triangle, water-drop-shaped, trapezoidal and other possess the geometrical shape of convergence type feature.
The orientation of described convergence type micropore, the screw type distributing line of medial axis direction and position is approximate tangent.
The scope of the described micropore degree of depth is: 0.005～0.2mm; The scope of large end width is: 0.005～0.1mm; Small end is 0～0.5 with the scope of the ratio of the width of large end; Micropore length with the scope of the ratio of large end width is: 0.2～5; Texture micropore along the spacing of distributing line direction and the scope of micropore length ratio is: 0.1～1; Texture micropore in the angular interval scope of circumferencial direction is: 4 °～40 °; The area density scope of micropore texture is: 0.1～0.6; The width of Ba Qu on radial direction is 0～0.5 with the scope of the ratio of anchor ring width, and above-mentioned parameter is constant or changes in given scope.
Working principle of the present invention:
Micropore texture has geometric convergence type characteristic, make fluid from upstream high voltage terminal low voltage terminal inflow downstream micropore texture, along being pushed by the geometrical shape of texture in the direction of micropore medial axis, thereby the end (downstream) in each micropore texture forms high pressure, thereby increased the hydrodynamic effect of texture, produced larger bearing capacity.
Meanwhile, the convergence type micropore texture of Spiral distribution can adapt to sealing ring surface mobile difference everywhere.On seal ring, from outer radius to inner radius, the turning radius reduces gradually, and along this direction, the circumferential speed of sealing medium is also downward trend.Between seal face, sealing medium is the synthetic of its circumferential flow and Radial Flow along end face mobile, thereby total flow direction of medium gradually changes along direction from outside to inside, and the closer to outside, circumferential speed component is larger.In the present invention, convergence type micropore texture, according to spiral distribution, can farthest be utilized this mobile feature, and comprehensive utilization fluid active and static pressure effect, increases bearing capacity.
Beneficial effect of the present invention is mainly manifested in: 1, seal face can be opened under lower rotating speed or pressure reduction, improves the start and stop effect of sealing; 2, at equal load-up condition lower seal, can form larger thickness, or there is larger axial rigidity at the situation lower seal of equal thickness, thereby preventing from sealing to touch rubs, and make seal operation more stable, improve the reliability of sealing.
Accompanying drawing explanation
Fig. 1 is end-face structure schematic diagram of the present invention.
Fig. 2 is the enlarged view of microcellular structure of the present invention.
Fig. 3 is micropore texture distributing line helix angle explanation schematic diagram of the present invention.
Fig. 4 is sealed structural representation of the present invention.
Fig. 5 is micro-pore shape schematic diagram of the present invention.
Fig. 6 is the embodiment's two of structure of the present invention end-face structure schematic diagram.
Fig. 7 is the embodiment's three of structure of the present invention end-face structure schematic diagram.
Fig. 8 is the embodiment's four of structure of the present invention end-face structure schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Referring to figs. 1 through Fig. 4, the mechanical seal of Spiral distribution convergence type micropore texture, between the casing and axle of rotating machinery, the rotating ring 4, the stationary ring 5 that comprise mechanical seal, an end face of rotating ring 4 and stationary ring 5 is relative, forms the seal face of ring, one side of sealing surface is high pressure side, be upstream, opposite side is low voltage side, i.e. downstream; Texture band 1 (R is set at least one seal face of described rotating ring 4 and stationary ring 5
3-R
2), texture band 1 is positioned at the high pressure side of sealing surface; The downstream of micropore texture band is provided with untextured dam district 2 (R
2-R
1); On texture band 1, arrange a series of micropore texture, the center 7 of every row micropore texture distributes according to helix 3, the trend of distributing line that is the center 7 of each row micropore texture is approximate helix (not necessarily mathematical accurate helix), or approximate curve, skew lines, as equiangular helical spiral, spiral of Archimedes, circular arc line, oblique broken line.When seal ring outside is high pressure, micropore convergence direction is contrary with helix expansion direction; When seal ring inner side is high pressure, micropore convergence direction is identical with helix expansion direction.
The pitch angle alpha will of described helix is defined as follows: establish smoothed curve (containing skew lines) from A point (or the A ' of the less inside radius of radius, A ") start, B point (or B ' to the larger outer radius place of radius, B ") till, the concentric circle at any radius R place between interior outer radius and this curve intersection are in P point (or P ', P "), described curve is crossed P point (or P ', P ") tangent line (or straight line itself) and above-mentioned concentric circle cross P point (or P ', P ") tangent line between folded angle α be helix angle, the scope of the helix angle of described distributing line is 0 ° of <| α | <90 °, optimum range is 5 °～30 °, pitch angle alpha will can be constant, also can change.
Each micropore of described micropore texture is convergence type shape downstream along upstream, and the length in the Length Ratio downstream of micropore texture upstream side is large, along Spiral distribution line 3 pore sizes from greatly to little variation and the large end of micropore towards high pressure side.Micropore be shaped as triangle, water-drop-shaped, trapezoidal and other possess the geometrical shape of convergence type feature.
The orientation of described micropore, the medial axis direction 6 of micropore and the screw type distributing line of position are similar to tangent (only referring to general tangential, might not be mathematical tangent accurately);
The scope of the described micropore degree of depth is: 0.005～0.2mm; The scope of large end width is: 0.005～0.1mm; Small end is 0～0.5 with the scope of the ratio of the width of large end; Micropore length with the scope of the ratio of large end width is: 0.2～5; Texture micropore along the spacing of distributing line direction and the scope of micropore length ratio is: 0.1～1; Texture micropore in the angular interval scope of circumferencial direction is: 4 °～40 °; The area density scope of micropore texture is: 0.1～0.6; The width of Ba Qu on radial direction is 0～0.5 with the scope of the ratio of anchor ring width, and above-mentioned parameter can be constant in given scope, or change.
Embodiment one
Fig. 1 is the schematic diagram of the embodiment of the present invention one.Sealing shown in Fig. 1, the outside of its seal ring end face is high pressure side, i.e. upstream, the inner side of seal face is low voltage side, i.e. downstream.In the convergence type micropore texture of the upper processing Spiral distribution of stationary ring 5 and rotating ring 4 one of (or both), texture band 1 is positioned at end face near outside diameter, and dam district 2 is positioned at end face near internal side diameter.
Embodiment two
Fig. 6 is the schematic diagram of the embodiment of the present invention two.Sealing shown in Fig. 6, the outside of its seal ring end face is high pressure side, i.e. upstream, the inner side of seal face is low voltage side, i.e. downstream.In the convergence type micropore texture of the upper processing Spiral distribution of stationary ring 5 and rotating ring 4 one of (or both), texture band 1 is covered with whole anchor ring, Wu Baqu.
Embodiment three
Fig. 7 is the schematic diagram of the embodiment of the present invention three.Sealing shown in Fig. 7, the inner side of its seal ring end face is high pressure side, i.e. upstream, the outside of seal face is low voltage side, i.e. downstream.In the convergence type micropore texture of the upper processing Spiral distribution of stationary ring 5 and rotating ring 4 one of (or both), texture band 1 is positioned at end face near internal side diameter, and dam district 2 is positioned at end face near outside diameter.
Embodiment four
Fig. 8 is the schematic diagram of the embodiment of the present invention four.Sealing shown in Fig. 8, the inner side of its seal ring end face is high pressure side, i.e. upstream, the outside of seal face is low voltage side, i.e. downstream.In the convergence type micropore texture of the upper processing Spiral distribution of stationary ring 5 and rotating ring 4 one of (or both), texture band 1 is covered with whole anchor ring, Wu Baqu.
Claims (5)
1. Spiral distribution convergence type micropore texture mechanical seal, the rotating ring, the stationary ring that comprise mechanical seal, an end face of rotating ring and stationary ring is relative, form the seal face of ring, it is characterized in that: at least one seal face of rotating ring and stationary ring, texture band is set, texture band is located on whole end face or close on high-tension side part end face; On texture band, arrange a series of micropore texture, the center of every row micropore texture distributes according to helix, the trend that is place, micropore texture center curve is approximate helix or approximate curve, skew lines, and when seal ring outside is high pressure, micropore convergence direction is contrary with helix expansion direction; When seal ring inner side is high pressure, micropore convergence direction is identical with helix expansion direction.
2. Spiral distribution convergence type micropore texture according to claim 1 mechanical seal, it is characterized in that: the pitch angle alpha will of described helix is defined as follows: establish smoothed curve (containing skew lines) from A point (or the A ' of the less inside radius of radius, A ") start, B point (or B ' to the larger outer radius place of radius, B ") till, the concentric circle at any radius R place between interior outer radius and this curve intersection are in P point (or P ', P "), curve is crossed P point (or P ', P ") tangent line (or straight line itself) and above-mentioned concentric circle cross P point (or P ', P ") tangent line between folded angle α be helix angle, the scope of the helix angle of distributing line is 0 ° of <| α | <90 °, pitch angle alpha will is constant or changes.
3. Spiral distribution convergence type micropore texture according to claim 1 mechanical seal, it is characterized in that: each micropore of described micropore texture is the convergence type shape downstream along upstream, the length in Length Ratio downstream that is micropore texture upstream side is large, along Spiral distribution line pore size from greatly to little variation and the large end of micropore towards high pressure side, micropore be shaped as triangle, water-drop-shaped, trapezoidal and other possess the geometrical shape of convergence type feature.
4. Spiral distribution convergence type micropore texture according to claim 1 mechanical seal, is characterized in that: the orientation of described convergence type micropore, the screw type distributing line of medial axis direction and position is approximate tangent.
5. Spiral distribution convergence type micropore texture according to claim 1 mechanical seal, is characterized in that: the scope of the described micropore degree of depth is: 0.005～0.2mm; The scope of large end width is: 0.005～0.1mm; Small end is 0～0.5 with the scope of the ratio of the width of large end; Micropore length with the scope of the ratio of large end width is: 0.2～5; Texture micropore along the spacing of distributing line direction and the scope of micropore length ratio is: 0.1～1; Texture micropore in the angular interval scope of circumferencial direction is: 4 °～40 °; The area density scope of micropore texture is: 0.1～0.6; The width of Ba Qu on radial direction is 0～0.5 with the scope of the ratio of anchor ring width, and above-mentioned parameter is constant or changes in given scope.
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| CN201410191186.3A CN104154235B (en) | 2014-05-07 | 2014-05-07 | Spiral distribution convergent micropore texture mechanical seal |
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| CN201410191186.3A CN104154235B (en) | 2014-05-07 | 2014-05-07 | Spiral distribution convergent micropore texture mechanical seal |
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| CN104154235B CN104154235B (en) | 2017-01-25 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864102A (en) * | 2015-04-03 | 2015-08-26 | 清华大学 | Non-contact fingertip seal device with rear baffle adopting micropore texture |
| CN106015580A (en) * | 2016-07-27 | 2016-10-12 | 浙江工业大学 | Dynamic and static pressure type cylindrical micro-convex body waviness distribution mechanical sealing structure |
| CN111473116A (en) * | 2020-05-25 | 2020-07-31 | 清华大学 | Upstream pumping microtextured mechanical seal end face structure |
| WO2022088272A1 (en) * | 2020-10-26 | 2022-05-05 | 常熟理工学院 | Sealing device for variable-working-condition gas-liquid two-phase fluid medium |
| US11692628B2 (en) | 2020-10-26 | 2023-07-04 | Changshu Institute Of Technology | Sealing device for gas-liquid two-phase fluid medium under variable working conditions |
| EP4102112A4 (en) * | 2020-04-07 | 2023-10-18 | Eagle Industry Co., Ltd. | Sliding component |
| CN117109909A (en) * | 2023-10-24 | 2023-11-24 | 张家港市赛斯机械密封有限公司 | Detection and early warning method and system for mechanical sealing performance of large-shaft-diameter semi-split type machine |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864102A (en) * | 2015-04-03 | 2015-08-26 | 清华大学 | Non-contact fingertip seal device with rear baffle adopting micropore texture |
| CN106015580A (en) * | 2016-07-27 | 2016-10-12 | 浙江工业大学 | Dynamic and static pressure type cylindrical micro-convex body waviness distribution mechanical sealing structure |
| EP4102112A4 (en) * | 2020-04-07 | 2023-10-18 | Eagle Industry Co., Ltd. | Sliding component |
| US11994217B2 (en) | 2020-04-07 | 2024-05-28 | Eagle Industry Co., Ltd. | Sliding component |
| CN111473116A (en) * | 2020-05-25 | 2020-07-31 | 清华大学 | Upstream pumping microtextured mechanical seal end face structure |
| WO2022088272A1 (en) * | 2020-10-26 | 2022-05-05 | 常熟理工学院 | Sealing device for variable-working-condition gas-liquid two-phase fluid medium |
| US11692628B2 (en) | 2020-10-26 | 2023-07-04 | Changshu Institute Of Technology | Sealing device for gas-liquid two-phase fluid medium under variable working conditions |
| CN117109909A (en) * | 2023-10-24 | 2023-11-24 | 张家港市赛斯机械密封有限公司 | Detection and early warning method and system for mechanical sealing performance of large-shaft-diameter semi-split type machine |
| CN117109909B (en) * | 2023-10-24 | 2023-12-22 | 张家港市赛斯机械密封有限公司 | Detection and early warning method and system for mechanical sealing performance of large-shaft-diameter semi-split type machine |
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