CN103016743A - Mechanical seal capable of implementing zero wear, zero leakage and preventing solid particles - Google Patents
Mechanical seal capable of implementing zero wear, zero leakage and preventing solid particles Download PDFInfo
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- CN103016743A CN103016743A CN2012105363553A CN201210536355A CN103016743A CN 103016743 A CN103016743 A CN 103016743A CN 2012105363553 A CN2012105363553 A CN 2012105363553A CN 201210536355 A CN201210536355 A CN 201210536355A CN 103016743 A CN103016743 A CN 103016743A
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- aerofoil profile
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Abstract
The invention relates to a mechanical seal structure capable of implementing zero wear, zero leakage and preventing solid particles, which comprises a moving ring and a static ring in mechanical sealing. The sealed end face of the moving ring is provided with airfoil slots which are symmetrically distributed around the rotating center and of which the axial cross sections are airfoil contour lines; sealing weirs are formed between the slots; the upstream and the downstream of the sealed end face are respectively provided with continuous ring-shaped sealing dams; and moreover, the non-slot region of the sealed end face is provided with micropores which are symmetrical around the rotating center and are distributed in an interrupted sector shape along the circumferential direction and the radius direction. The seal structure can be suitable for the field of application of mechanical seals for all liquid mediums and is particularly suitable for harsh working conditions of high temperature, high pressure, high speed, solid particle mediums and the like.
Description
Technical field
The present invention relates to end surface mechanical sealing mechanism design technical field, specifically refer to a kind of mechanical sealing structure that realizes zero wearing and tearing and zero leakage and anti-solid particle, purpose is to obtain stronger fluid pumping ability and larger hydrodynamic effect, from reducing to the full extent the abrasive wear of seal ring end face.
Background technique
Mechanical seal is a kind of Aero-Space that are widely used in, defence and military, the running shaft axial end seal arrangement in the high-technology fields such as nuclear energy power generation and the fields such as oil, petrochemical industry and chemical industry, along with developing rapidly of science and technology, mechanical seal is had higher requirement, particularly in order to adapt to the requirement of High Temperature High Pressure harsh conditions at a high speed, proposed to be used for the upstream pumping mechanical seal of seal fluid medium; In recent years, because the research of upstream pumping mechanical seal mainly is the pattern that improves seal face around the target of " minimizing leakage rate " and " improving the dynamic pressure effect ".Chinese patent 96216242.6 discloses a kind of double-loop spiral-slot mechanical seal, this mechanical seal is to offer spiral chute in the middle of seal ring, a sealing dam is respectively arranged at the internal-and external diameter place, can increase to a certain extent like this bearing capacity of fluid film, but dynamic pressure effect still a little less than; Israel professor Etsion.I is at Model for mechanical seals with regularmicrosurface structure.Tribology transactions, 39 (3): proposed the surface in 677-683(1996)-one literary composition and had the mechanical seal of surrounding and watching cavity, calculate and experimental studies have found that by theory, the microcosmic cavity is conducive to produce the hydrodynamic effect, so this class mechanical seal is lubricated in improvement, improve fluid film rigidity aspect successful, but this nick chamber can not produce the pumping effect, so can't solve the minimizing leakage problem; Chinese patent 200710067282.7 relates to a kind of variable distribution porous end face mechanical sealing structure, the rotating ring and the stationary ring that comprise mechanical seal, at least one seal face has micropore in described rotating ring or stationary ring, described micropore differs in size, in the seal face distribution that is centrosymmetric, this mechanical seal increases the resistance to pressure of fluid film to a certain extent, wear resistance and convergence, thereby improved the dynamic pressure effect of fluid film, it is slow that but its dynamic pressure effect increases effect, pumping capacity a little less than, the improvement of Properties of Dry Friction Problems has little effect during especially for start, and the hydrodynamic effect that produces when not having seal face section distribution hole according to the full cloth of experimental verification seal face hole in addition is strong; Chinese patent 200510038704.9 discloses the end surface mechanical sealing that a kind of vallecular cavity mutually combines, this mechanical seal is to offer microcosmic lubricating cavity with certain distributing position and the macro pumping grooves of certain forms at the rotating ring of mechanical seal or stationary ring, the combination of these two kinds of moulding is so that the hydrodynamic effect of mechanical seal and pumping effect are more remarkable, be applicable to all liquid medium mechanical seals, major advantage is that the lubricating cavity of microcosmic and macroscopical pumping groove are combined, solved leakage and the lubricated anti-attrition problem of sealing, but obvious not for the lubrication state effect of improving when starting shooting.
Summary of the invention
Purpose of the present invention is exactly the deficiency in the above-mentioned technology and a kind of novel mechanical seal structure that proposes, it mainly be for the existing problem of existing Hydrodynamic pressure type mechanical seal such as leakage prevention capability (pumping ability) a little less than, dynamic pressure effect is not outstanding, have Properties of Dry Friction Problems etc. during start and invention have a stronger pumping ability, better dynamic pressure effect, desirable anti-solid particle ability, good moment unlatching and the Leakless non-contact mechanical seal of parking sealer performance, can take into account simultaneously and improve the lubrication effect, reduce thermal distortion, improve the operation stability of seal ring.
The present invention relates generally to the rotating ring of mechanical seal for achieving the above object, and its technical characteristics is: the seal face of moving sealing ring offer axial cross section be the aerofoil profile groove that forms of aerofoil profile line and along seal face circumferentially and radial direction be the micropore that is interrupted fan-shaped distribution.
The internal diameter r1 of aerofoil profile groove is greater than the internal diameter R1 of seal ring, the external diameter r2 of aerofoil profile groove is less than the external diameter R2 of seal ring, thereby form the fluid dynamic pressure groove end face with Double Seal Dam, axial cross section is that the aerofoil profile groove of aerofoil profile is positioned in the middle of the moving sealing ring, the number N that slots is 12～30, the depth H of groove is 5～30um, the aerofoil profile line is any aerofoil profile line in the middle of NACA series aerofoil profile and the circular arc aerofoil profile, along seal face circumferentially and radial direction be the micropore that is interrupted fan-shaped distribution and be distributed in to seal Ba Qu or be distributed in and seal the weir district, its circumferential perforate Length Ratio α=0.3～0.5, radial aperture Length Ratio β=0.45～0.85, the degree of depth h of the micropore of opening is 5～30um, the pore radius r that opens is 20～50um, micropore aspect ratio ε is not less than 0.1, the micropore of opening is rectangle or circular cross-section micropore, and being the micropore column number m that is interrupted fan-shaped distribution on the seal face is 12～38.
Each process parameter of this structure is by above value, and each process parameter can be so that this construction machine sealing reaches desirable hydrodynamic effect and pumping effect in this span.
This seal ring surface offer simultaneously axial cross section be the fluid dynamic pressure groove that forms of aerofoil profile line and along seal face circumferentially and the radial direction mechanical seal structure that is the micropore that is interrupted fan-shaped distribution be applicable to the sealing of any liquid medium.
Effect of the present invention mainly is: offering axial cross section at the rotating ring of mechanical seal is the aerofoil profile groove that the aerofoil profile line forms, sealing weir between groove and the groove is equivalent to pump blade, when mechanical seal is rotated, the pump blade of rotating ring end face rotates thereupon, whole rotating ring end face is equivalent to one " pump " with efficient acting ability (pumping capacity), to send the high pressure side back to by the fluid pump that the high pressure side leaks to low voltage side from seal face, diameter outwards moves under centrifugal action less than the solid particle of end face fluid film thickness simultaneously, thereby has prevented that effectively solid particle from entering seal face; Strengthen greatly the hydrodynamic effect by being the micropore " enrichment effect " that is interrupted fan-shaped distribution along circumferential and radial direction, lubrication state when effectively having improved start, thereby make the hydrodynamic effect of this mechanical sealing and pumping effect more remarkable, when reaching zero leakage, improved greatly like this bearing capacity of sealing, greatly strengthened the operation stability of mechanical seal ring, anti-solid particle ability obviously improves, lubrication effect obviously improves, and has greatly prolonged the working life of mechanical seal.
Description of drawings
Accompanying drawing 1 is rotating ring end-face structure schematic diagram of the present invention;
Accompanying drawing 2 is rotating ring face size structural representation of the present invention;
Accompanying drawing 3 is rotating ring end face A-A view of the present invention;
Accompanying drawing 4 partial enlarged drawing B of the present invention;
Accompanying drawing 5 partial enlarged drawing C of the present invention;
Accompanying drawing 6 is the fundamental diagram of mechanical seal;
The drawing of accompanying drawing 6 is described as follows:
1-stationary seal ring; 2-moving sealing ring; 3-driving pin; 4-spring; 5-spring seat; 6-Cock screw, 7-transmission screw; 8-rotating ring O shape circle; 9-stationary ring O shape circle; 10-stop pin; 11-gland; 12-throw-out collar; 13-axle sleeve;
Symbol description:
Circumferential perforate Length Ratio α=L1/L2;
Radial aperture Length Ratio β=﹙ R2-r1 ﹚/﹙ R2-R1 ﹚;
Micropore aspect ratio ε=h/2r.
Embodiment
The present invention can adopt laser processing mode to realize the design proposal on seal ring surface, and laser processing technology reaches its maturity and easily control, can realize the processing to required pattern.
Offer about the edge of rotating center symmetry circumferentially and radial direction is the micropore that is interrupted fan-shaped distribution and be the aerofoil profile groove of aerofoil profile line composition about the symmetrical axial cross section of rotating center at mechanical sealing linkage ring, as shown in Figure 1; Offering of micropore and aerofoil profile groove can be carried out in the steps below: at first, offer the micropore that is interrupted fan-shaped distribution at the All Ranges of seal ring, the micropore degree of depth h of these micropores is 5～30um, the radius r of micropore is 20～50um, its circumferential perforate Length Ratio α is 0.3～0.5, radial aperture Length Ratio β is 0.45～0.85, as shown in Figure 5; Then, offering axial cross section in the zone line of seal ring is the aerofoil profile groove that the aerofoil profile line forms, the depth H of groove is (1 ~ 1.1) h, like this in the zone of aerofoil profile groove, the aerofoil profile groove can cover the micropore of offering in advance, realizes the seal face pattern that micropore and aerofoil profile groove combine, and institute's aerofoil profile groove of opening is symmetrical about rotating center, the number N of groove is 12～30, and the depth H of groove is 5～30um; Owing to being opened on the moving sealing ring, axial cross section is that the sense of rotation of the true dip direction of the aerofoil profile groove that forms of aerofoil profile line and rotating ring is opposite, as shown in Figure 1; The working procedure of seal ring: as shown in Figure 6, behind host-initiated, running shaft is by 5 revolutions of Cock screw 6 band flexible spring seats, spring seat 5 then drives spring 4 by transmission screw 7 and driving pin 3, throw-out collar 12, rotating ring sealing O shape circle 8 and moving sealing ring 2 rotate together, thereby the relative rotation motion that produces moving sealing ring 2 and stationary seal ring 1 contacts with good applying, like this, viscous fluid medium with certain pressure enters between the end face of moving sealing ring 2 and stationary seal ring 1, owing to offering the aerofoil profile groove that axial cross section is aerofoil profile line composition on the rotating ring of mechanical seal, sealing weir between groove and the groove is equivalent to pump blade, when mechanical seal is rotated, the pump blade of rotating ring end face rotates thereupon, whole rotating ring end face is equivalent to one " pump " with efficient acting ability (pumping capacity), to send the high pressure side back to by the fluid pump that the high pressure side leaks to low voltage side from seal face, diameter is less than solid particle outwards motion under centrifugal action of end face fluid film thickness simultaneously, thereby prevented that effectively solid particle from entering seal face, pumping effect and dynamic pressure effect significantly embody; Strengthen greatly the hydrodynamic effect by being the micropore " enrichment effect " that is interrupted fan-shaped distribution along circumferential and radial direction, the hydrodynamic effect makes fluid film produce axial opening force, the closing force that this opening force is made of sealed medium pressure and spring force by balance, two seal faces are separated, lubrication state when effectively having improved start is realized non-contact, zero leakage.
The present embodiment is explanation the present invention its grooved shape and distributing position, and the micropore distributing position is all unrestricted, can be all situations of mentioning in the summary of the invention.
Claims (4)
1. the mechanical seal structure that can realize zero wearing and tearing and zero leakage and anti-solid particle, the rotating ring and the stationary ring that comprise mechanical seal, it is characterized in that: offer on the seal face of described rotating ring about the symmetrical axial cross section of rotating center be the aerofoil profile groove that forms of aerofoil profile line and about the edge of rotating center symmetry circumferentially and radial direction be the micropore that is interrupted fan-shaped distribution, the upstream and downstream of described rotating ring seal face respectively is provided with a continuous ring packing dam.
2. a kind of mechanical seal structure of realizing zero wearing and tearing and zero leakage and anti-solid particle according to claim 1, it is characterized in that: the internal diameter r1 of the aerofoil profile groove of the seal face of described rotating ring is greater than the internal diameter R1 of seal ring, the external diameter r2 of aerofoil profile groove is less than the external diameter R2 of seal ring, thereby formation has the fluid dynamic pressure groove end face of Double Seal Dam; The aerofoil profile groove is positioned in the middle of the moving sealing ring, and groove is counted N=12～30, and the depth H of groove is (1 ~ 1.1) h, and h is the micropore degree of depth, the depth H of groove=5～30um; The true dip direction of aerofoil profile groove is opposite with the sense of rotation of rotating ring.
3. a kind of mechanical seal structure of realizing zero wearing and tearing and zero leakage and anti-solid particle according to claim 1, it is characterized in that: described aerofoil profile line is any aerofoil profile line in the middle of NACA series aerofoil profile and the circular arc aerofoil profile.
4. a kind of mechanical seal structure of realizing zero wearing and tearing and zero leakage and anti-solid particle according to claim 1, it is characterized in that: described micropore is rectangle or circular cross-section, be distributed in sealing Ba Qu or be distributed in sealing weir district, micropore column number m=12～38, its circumferential perforate Length Ratio α=0.3～0.5, radial aperture Length Ratio β=0.45～0.85, the micropore degree of depth h=5～30um that opens, pore radius r=20～the 50um that opens, micropore aspect ratio ε is not less than 0.1, is from upstream to downstream micropore area density and radially increases gradually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210536355.3A CN103016743B (en) | 2012-12-13 | 2012-12-13 | Mechanical seal capable of implementing zero wear, zero leakage and preventing solid particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210536355.3A CN103016743B (en) | 2012-12-13 | 2012-12-13 | Mechanical seal capable of implementing zero wear, zero leakage and preventing solid particles |
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| CN103016743A true CN103016743A (en) | 2013-04-03 |
| CN103016743B CN103016743B (en) | 2015-07-08 |
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| CN201210536355.3A Expired - Fee Related CN103016743B (en) | 2012-12-13 | 2012-12-13 | Mechanical seal capable of implementing zero wear, zero leakage and preventing solid particles |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103470770A (en) * | 2013-09-06 | 2013-12-25 | 浙江工业大学 | Micro-hole end face mechanical seal structure with air inlet grooves |
| CN103470771A (en) * | 2013-09-06 | 2013-12-25 | 浙江工业大学 | End face mechanical seal structure with air inlet grooves and micropores |
| CN103557334A (en) * | 2013-11-14 | 2014-02-05 | 江苏大学 | Multiple-end face combined type mechanical seal for realizing zero leakage and non-contact |
| CN103742652A (en) * | 2013-11-28 | 2014-04-23 | 成都欧浦特控制阀门有限公司 | Mechanical sealing structure |
| CN104728451A (en) * | 2015-04-09 | 2015-06-24 | 江西省科学院应用物理研究所 | Directivity large hole and three-dimensional groove combined non-contact type mechanical sealing structure |
| CN106838323A (en) * | 2017-03-30 | 2017-06-13 | 浙江工业大学 | A kind of end surface mechanical sealing structure of imitative shark skin surface three-dimensional appearance |
| CN114483962A (en) * | 2022-04-02 | 2022-05-13 | 东营海森密封技术有限责任公司 | Wing-shaped dynamic pressure non-contact sealing structure |
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| EP0466076A2 (en) * | 1990-07-09 | 1992-01-15 | Ebara Corporation | Spiral groove face seal |
| JPH0469309B2 (en) * | 1982-06-25 | 1992-11-05 | Maschf Augsburg Nuernberg Ag | |
| US5224714A (en) * | 1990-07-18 | 1993-07-06 | Ebara Corporation | Noncontacting face seal |
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| CN201582390U (en) * | 2009-09-08 | 2010-09-15 | 江苏大学 | Novel mechanical sealing ring with circumferential through groove added at inner-diameter end of radial spiral groove |
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2012
- 2012-12-13 CN CN201210536355.3A patent/CN103016743B/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US3109658A (en) * | 1957-02-04 | 1963-11-05 | Atomic Energy Authority Uk | Viscosity groove type shaft seal |
| JPH0469309B2 (en) * | 1982-06-25 | 1992-11-05 | Maschf Augsburg Nuernberg Ag | |
| EP0466076A2 (en) * | 1990-07-09 | 1992-01-15 | Ebara Corporation | Spiral groove face seal |
| US5224714A (en) * | 1990-07-18 | 1993-07-06 | Ebara Corporation | Noncontacting face seal |
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| CN1667302A (en) * | 2005-04-05 | 2005-09-14 | 江苏大学 | Method for realizing zero leakage and non-contact mechanical seal |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103470770A (en) * | 2013-09-06 | 2013-12-25 | 浙江工业大学 | Micro-hole end face mechanical seal structure with air inlet grooves |
| CN103470771A (en) * | 2013-09-06 | 2013-12-25 | 浙江工业大学 | End face mechanical seal structure with air inlet grooves and micropores |
| CN103557334A (en) * | 2013-11-14 | 2014-02-05 | 江苏大学 | Multiple-end face combined type mechanical seal for realizing zero leakage and non-contact |
| CN103742652A (en) * | 2013-11-28 | 2014-04-23 | 成都欧浦特控制阀门有限公司 | Mechanical sealing structure |
| CN104728451A (en) * | 2015-04-09 | 2015-06-24 | 江西省科学院应用物理研究所 | Directivity large hole and three-dimensional groove combined non-contact type mechanical sealing structure |
| CN106838323A (en) * | 2017-03-30 | 2017-06-13 | 浙江工业大学 | A kind of end surface mechanical sealing structure of imitative shark skin surface three-dimensional appearance |
| CN114483962A (en) * | 2022-04-02 | 2022-05-13 | 东营海森密封技术有限责任公司 | Wing-shaped dynamic pressure non-contact sealing structure |
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|---|---|
| CN103016743B (en) | 2015-07-08 |
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