CN103527792B - The rotating ring of upstream pumping mechanical seal and face type groove thereof - Google Patents
The rotating ring of upstream pumping mechanical seal and face type groove thereof Download PDFInfo
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- CN103527792B CN103527792B CN201310544633.4A CN201310544633A CN103527792B CN 103527792 B CN103527792 B CN 103527792B CN 201310544633 A CN201310544633 A CN 201310544633A CN 103527792 B CN103527792 B CN 103527792B
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- rotating ring
- type groove
- face type
- groove
- mechanical 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
- F16J15/34—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
- F16J15/3412—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 cavities
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
This technology provides rotating ring and the rotating ring face type groove of the good upstream pumping mechanical seal of a kind of sealing effect.The spiral chute of this rotating ring face type groove to be inside and outside two side be helix, the end of inside and outside two side respectively with the Inner arc extended inside spiral chute and external arc tangent, Inner arc and external arc are connected to form the closed end of face type groove.This rotating ring, the seal face of rotating ring has 8-15 rotating ring face type groove, and each face type groove is symmetrical with the axis centre of rotating ring.
Description
Technical field
This technology relates to upstream pumping mechanical seal, specifically, is a kind of rotating ring and face type groove thereof of upstream pumping mechanical seal.
Background technique
Upstream pumping mechanical seal is a kind of novel non-contact end face seal based on Modern fluid hydrodynamic lubrication theory.The rotating ring end face relative with stationary ring has type groove, rotating ring rotates relative to stationary ring around axis, a small amount of spacer medium draws in Seal cage along sealed end face-pumping by " the end face pump " that utilize the type groove of the seal face of rotating ring to be formed, and liquid film is stablized in formation between two seal ring end faces, thus stop by envelope dielectric leakage.Owing to being sealed the pressure of pressure higher than spacer medium of medium, and the flow direction of spacer medium is the Seal cage chamber being flowed to high pressure by the spacer medium chamber of low pressure, so be referred to as " upstream " pumping.
Compared with upstream pumping mechanical seal seals with conventional machinery, its feature is that it utilizes grooved faces technology to improve the hydrodynamic effect of sealing.It is contrary that the sticky shearing stream and the high pressure that produce due to type concentrated flow body dynamic pressure effect are sealed the pressure reduction flow path direction that medium and low pressure spacer medium produce, and therefore total leakage rate of sealing can be made to be zero when shear flow is equal with pressure reduction stream flow.In addition, grooved faces is formed " end face pump " can make the spacer medium supercharging gradually of inflow.The face opening that elasticity can be made to install after fluid pressure increases forms stable liquid film, serves lubrication, substantially increases the working life of mechanical seal.
The sealing mechanism of upstream pumping mechanical seal relies on hydrodynamic effect to make spacer medium flow to high pressure side from low voltage side, produces opening force with balance closure power, realizes noncontact seal.Upstream pumping mechanical seal face type groove is generally about rotating shaft center's symmetrical structure, and the profile line of groove mostly is straight line, helix, circular arc; Groove number is generally 8 to 15, and groove depth is micron order, and sealed width is larger.Single line style type groove structure is succinct, and modeling is convenient.
Fig. 1 is the rotating ring schematic diagram with helix-type flute structure in upstream pumping mechanical seal.When rotating ring 1 rotates along direction as shown, spacer medium speedup along the spiral chute line of rabbet joint constantly to outside diameter conveying, form shear flow under the effect of screw type line of rabbet joint convex surface in spiral chute 2 groove, by the stop on sealing dam 3 and sealing weir 4, and then forms dynamic pressure liquid film; Meanwhile, sealed medium flows to low voltage side 6 from high pressure side 5 due to differential pressure action, forms pressure reduction stream, realizes zero leakage when shear flow and pressure reduction stream balance each other.The formation of dynamic pressure liquid film, make contactless wearing and tearing between the end face of rotating ring and stationary ring, seal life also improves greatly.
It is good and bad that sealing configuration, material behavior etc. are related to its sealability, wherein the geometrical construction of face type groove and parameter having the greatest impact to sealing effect thereof.Spiral chute is the structure that in single type groove, performance is comparatively good, and its liquid film bearing capacity and liquid film stiffness are all greater than oblique trunking and chevron-notch, and the type groove parameter affecting its sealability mainly contains: angle of groove inclination, groove footpath width-diameter ratio etc.Relevant research shows, after groove footpath width-diameter ratio is greater than 0.73, although pumping amount is also in increase, liquid film stiffness reduces rapidly, is unfavorable for sealing stability; Carry out the analysis of pressure flow field stimulation according to FLUENT software to groove internal pressure, internal diameter inlet pressure is minimum, and groove terminal pressure reaches maximum, but has part area to occur negative pressure appearance, and liquid film bearing capacity is declined.
Summary of the invention
The object of this technology is to provide the rotating ring face type groove of the good upstream pumping mechanical seal of a kind of sealing effect.
The rotating ring face type groove of the upstream pumping mechanical seal of this technology, the spiral chute of this face type groove to be inside and outside two side be helix, the end of inside and outside two side respectively with the Inner arc extended inside spiral chute and external arc tangent, Inner arc and external arc are connected to form the closed end of face type groove.
The rotating ring face type groove of above-mentioned upstream pumping mechanical seal, helix is log spiral.
The rotating ring face type groove of above-mentioned upstream pumping mechanical seal, type groove deep 3-7um, spiral fluted tilt angle is 15 °-22 °.
This technology provides a kind of rotating ring of upstream pumping mechanical seal of good sealing effect simultaneously.
The rotating ring of this upstream pumping mechanical seal, the seal face of rotating ring has the individual above-mentioned rotating ring face type groove of 8-15, each face type groove is symmetrical with the axis centre of rotating ring.
The rotating ring of above-mentioned upstream pumping mechanical seal, groove footpath width-diameter ratio is 0.5-0.75.
The beneficial effect of this technology: the type groove end of this technology is the arc groove between Inner arc and external arc, can say that this poly-talented groove is the combination of spiral chute and arc groove, under equal conditions simulation analysis is carried out by carrying out pressure flow field to the pressure in the combined groove of this technology and single spiral fluted pressure, for the combined groove of this technology, negative pressuren zone area reduces to some extent, bearing capacity increases, and the performances such as the liquid film stiffness of the combined groove of this technology and opening force are better than single spiral chute.Claimant analyzes, it may be adding of arc groove, change original spiral fluted Way out, namely make pumping fluid by the original backflow becoming and return lower pressure downstream that to liquidate with upstream incoming flow, thus form stable zone of high pressure barrier at groove end, like this, zone of high pressure barrier is energy more effective blocking-up upstream incoming flow just, and sealing effect is better.Add tangent arc groove at spiral groove end, groove footpath width-diameter ratio remains unchanged, and namely increases the area of bearing groove, and when film pressure distribution is constant, opening force will increase.
Accompanying drawing explanation
Fig. 1 has spiral fluted rotating ring schematic diagram in existing upstream pumping mechanical seal;
Fig. 2 is the rotating ring schematic diagram with combined groove in the upstream pumping mechanical seal of this technology;
Fig. 3 is computational domain schematic diagram.
Fig. 4 is the computational domain rotating ring end face static pressure distribution cloud atlas under rotating ring 900r/min when pressure is 0.4MPa.
Fig. 5 is the computational domain rotating ring end face static pressure distribution cloud atlas under rotating ring 2500r/min when pressure is 0.4MPa.
Fig. 6 is the computational domain rotating ring end face static pressure distribution cloud atlas under rotating ring 4000r/min when pressure is 0.4MPa.
Fig. 7 is each color (gray scale) and pressure corresponding diagram in static pressure distribution cloud atlas.
Embodiment
The rotating ring 1 of upstream pumping mechanical seal shown in Figure 2, endoporus 11 diameter of rotating ring is 50mm, and external diameter is 100mm.The seal face 2 of rotating ring has 12 combined grooves 3, various groove 3 is symmetrical with the axis centre of rotating ring.The entrance point of type groove communicates with rotating ring endoporus.Combined groove 3 comprises spiral chute 31 and is positioned at the arc groove 32 of spiral groove end.Spiral fluted madial wall 311 and outer side wall 312 are log spiral, and the sidewall of arc groove 32 mainly comprises Inner arc 321 and external arc 322.The end of madial wall 311 is tangent with the Inner arc 321 extended inside spiral chute, and the end of outer side wall 312 is tangent with the external arc 322 extended inside spiral chute, and Inner arc and external arc are smoothly connected to form the closed end of face type groove.Type groove deep 5um, spiral fluted tilt angle is 21 °.Groove footpath width-diameter ratio is 0.7.
As follows to the test of this rotating ring end face static pressure distribution.
Because the grooved on whole end face becomes periodic distribution, groove number N=12, therefore the 1/N rounding seal face is as computational domain.Computational domain has two circular arcs and two helixes to surround, and combined groove 3 is positioned at the side of computational domain.Computational domain as shown in Figure 3.
The pressure cloud atlas of the liquid film of upstream pumping mechanical seal is calculated see Fig. 4-7 after manual modeling.Fig. 7 is each color (gray scale) and pressure corresponding diagram in static pressure distribution cloud atlas, and Tu Zhong numerical value unit is Pa, and dark colour as most in lower end in Fig. 7 represents that pressure is minimum, and numerical value is-1.18*10
5pa(negative pressure), in Fig. 7, upper end low haze represents that pressure is maximum, and numerical value is 1.84*10
6pa.
Fig. 4-6 for sealed medium is when pressure is 0.4MPa, the static pressure distribution cloud atlas of liquid film in computational domain under rotating ring 3 kinds of different rotating speeds (900r/min, 2500 r/min, 4000 r/min).Contrast Fig. 7, can find out, the maximum static pressure higher than pressure medium is there is at combined groove water jacket root place, this is one of key factor increasing liquid film opening force, high pressure side liquid can be stoped partly to flow to low voltage side, thus play certain seal action, and due to the backflow effect of arc groove, make pumping fluid by the original backflow becoming and return lower pressure downstream that to liquidate with upstream incoming flow, thus form stable zone of high pressure barrier at type groove end, block upstream incoming flow.At inside groove root there is minimum static pressure in place, and the leakage liquid that high pressure side can be flowed to low voltage side absorbs also pumping to high pressure side, plays the effect reducing or stop to leak.Combined groove can improve the stability of liquid film to a certain extent, forms high compression ring at groove bottom, effectively stops by envelope dielectric leakage.As can be seen from the figure, negative pressuren zone area is less, and bearing capacity increases, and the performances such as the liquid film stiffness of combined groove and opening force are better than single spiral chute.
Claims (5)
1. the rotating ring face type groove of upstream pumping mechanical seal, the spiral chute of this face type groove to be inside and outside two side be helix, it is characterized in that: the end of inside and outside two side respectively with the Inner arc extended inside spiral chute and external arc tangent, Inner arc and external arc are connected to form the closed end of face type groove.
2. the rotating ring face type groove of upstream pumping mechanical seal as claimed in claim 1, is characterized in that: helix is log spiral.
3. the rotating ring face type groove of upstream pumping mechanical seal as claimed in claim 1, it is characterized in that: type groove deep 3-7um, spiral fluted tilt angle is 15 °-22 °.
4. the rotating ring of upstream pumping mechanical seal, is characterized in that: the seal face of rotating ring has the rotating ring face type groove described in 8-15 claim 1,2 or 3, and each face type groove is symmetrical with the axis centre of rotating ring.
5. rotating ring as claimed in claim 4, is characterized in that: groove footpath width-diameter ratio is 0.5-0.75.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310544633.4A CN103527792B (en) | 2013-11-06 | 2013-11-06 | The rotating ring of upstream pumping mechanical seal and face type groove thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310544633.4A CN103527792B (en) | 2013-11-06 | 2013-11-06 | The rotating ring of upstream pumping mechanical seal and face type groove thereof |
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| Publication Number | Publication Date |
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| CN103527792A CN103527792A (en) | 2014-01-22 |
| CN103527792B true CN103527792B (en) | 2015-09-09 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982662A (en) * | 2014-06-11 | 2014-08-13 | 湘潭电机股份有限公司 | Rotary sealing device |
| US20180187785A1 (en) * | 2015-06-27 | 2018-07-05 | Eagle Industry Co., Ltd. | Sliding component |
| CN105465371A (en) * | 2015-12-30 | 2016-04-06 | 南京林业大学 | Bidirectional-rotation self-pumping fluid dynamic pressure type mechanical seal |
| CN108825788A (en) * | 2018-07-19 | 2018-11-16 | 天津科技大学 | Mechanical sealing end face structure |
| CN110925426A (en) * | 2019-12-26 | 2020-03-27 | 温州市天成密封件制造有限公司 | Upstream pumping mechanical sealing ring with elliptical groove |
| CN111365249A (en) * | 2020-03-12 | 2020-07-03 | 扶冉(上海)流体技术有限公司 | Mechanical seal for sanitary pump |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6237573A (en) * | 1985-08-12 | 1987-02-18 | Ebara Res Co Ltd | Shaft seal device |
| JPS6237572A (en) * | 1985-08-12 | 1987-02-18 | Ebara Res Co Ltd | Shaft seal device |
| JPH076579B2 (en) * | 1987-08-17 | 1995-01-30 | 株式会社荏原製作所 | Shaft seal device |
| CN201306445Y (en) * | 2008-10-16 | 2009-09-09 | 东营海森密封技术有限责任公司 | Liquid film lubrication double end surface non-contact mechanical seal device |
| CN101793324B (en) * | 2009-08-06 | 2011-12-28 | 浙江工业大学 | Hydrodynamic mechanical seal structure for three-dimensional fish scale-like texture bottom surface type groove |
| CN101644333B (en) * | 2009-08-20 | 2011-08-31 | 浙江工业大学 | Gas end surface sealing structure with three-dimensional feather-like textured bottom shaped grooves |
| CN201521636U (en) * | 2009-08-20 | 2010-07-07 | 浙江工业大学 | Gas face seal structure of three-dimensional shaped groove with bottom similar to feather texture |
| CN103115151B (en) * | 2013-02-04 | 2014-04-16 | 北京理工大学 | Spiral groove rotary sealing ring with porous end surface for vehicle |
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Application publication date: 20140122 Assignee: Chuzhou Monte tech Environmental Protection Technology Co., Ltd. Assignor: Nanjing Forestry University Contract record no.: 2018320000280 Denomination of invention: Rotating seal ring with upstream pumping mechanical seal and end face type grooves thereof Granted publication date: 20150909 License type: Common License Record date: 20181101 Application publication date: 20140122 Assignee: Nanjing Rui Zhao Environmental Protection Technology Co., Ltd. Assignor: Nanjing Forestry University Contract record no.: 2018320000271 Denomination of invention: Rotating seal ring with upstream pumping mechanical seal and end face type grooves thereof Granted publication date: 20150909 License type: Common License Record date: 20181031 |
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Application publication date: 20140122 Assignee: Anhui Arrow Electronics Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2020320000233 Denomination of invention: Moving ring and end face groove of upstream pumping mechanical seal Granted publication date: 20150909 License type: Common License Record date: 20201123 |