CN203784293U - Mechanical sealing device - Google Patents
Mechanical sealing device Download PDFInfo
- Publication number
- CN203784293U CN203784293U CN201420126010.5U CN201420126010U CN203784293U CN 203784293 U CN203784293 U CN 203784293U CN 201420126010 U CN201420126010 U CN 201420126010U CN 203784293 U CN203784293 U CN 203784293U
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- China
- Prior art keywords
- pressure control
- ring
- sealing
- face
- rotating
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- Expired - Fee Related
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 41
- 230000000694 effects Effects 0.000 abstract description 9
- 230000003068 static effect Effects 0.000 abstract description 7
- 239000012530 fluid Substances 0.000 abstract description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract 2
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 230000002706 hydrostatic effect Effects 0.000 description 8
- 239000007788 liquid Substances 0.000 description 5
- CVOFKRWYWCSDMA-UHFFFAOYSA-N 2-chloro-n-(2,6-diethylphenyl)-n-(methoxymethyl)acetamide;2,6-dinitro-n,n-dipropyl-4-(trifluoromethyl)aniline Chemical compound CCC1=CC=CC(CC)=C1N(COC)C(=O)CCl.CCCN(CCC)C1=C([N+]([O-])=O)C=C(C(F)(F)F)C=C1[N+]([O-])=O CVOFKRWYWCSDMA-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000001138 tear Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Mechanical Sealing (AREA)
Abstract
The utility model discloses a mechanical sealing device which is arranged between a rotating shaft and an enclosure of a rotary machine, a stationary ring base and the enclosure are fixed, a stationary ring is mounted in the stationary ring base in a sleeving manner, a secondary seal O-shaped ring and a spring are mounted between the stationary ring and the stationary ring base, an anti-rotating pin is respectively inserted into the stationary ring base and the stationary ring, a movable ring is fixed on the rotating shaft, a pressure control cavity is formed in the side surface of the movable ring, a pressure control plug is mounted in the pressure control cavity, and one end, close to the outer diameter of the movable ring, of the pressure control cavity is communicated with a sealing high pressure area through a pore passage. The static pressure effect of the fluid between sealing end faces is strengthened through a flow guide pore passage, and the sealing abrasion is reduced when the sealing is operated at a low speed. Besides, when the sealing is at a normal working rotating speed, the regulating and controlling actions are stopped automatically due to the centrifugal force of the control plug rotating along with the shaft, the overlarge fluid leakage rate is avoided, the additional static pressure action of the sealing end faces is automatically regulated according to the rotating speed, and no external control is needed.
Description
Technical field
The utility model belongs to sealing machine field, is specifically related to a kind of mechanical seal device, and when can reducing the wearing and tearing in low speed process and preventing high speed, leak-down rate is excessive.
Background technique
Be sealed in and in machinery, there is very consequence.The performance performance of sealing and normal operation, can be related to machinery run well.Even lost efficacy once sealability declines, and may cause working medium or the leakage rate of Lubricants to increase, light affect the service behaviour of equipment, heavy produce significant fretting wear, make shortened equipment life and even be damaged.Be poisonous and harmful or the dangerous substance such as inflammable and explosive for sealing medium, the accident that also may cause jeopardizing the person, device security, brings the loss that cannot retrieve.Therefore, when improving the performance of sealing, extending as far as possible the sealing mechanism research and technology exploitation in working life, is one of the emphasis in current Research on Seal field.
Hydrodynamic mechanical seal is a kind of contactless motive sealing, is generally used as the shaft end seal of rotating machinery.Its working principle is liquid or the gas working dielectric between two parallel seal rings, due to hydrostatic pressure and dynamic pressure effect, forms liquid or the gas membrane with certain rigidity between seal ring, and making can non-contact running between sealing surface.Simultaneously because thickness is very little, can restrict, play the effect of sealing.But, in the time that hydrodynamic mechanical seal moves under the slow-speed of revolution, in device start and stopped process, because dynamic pressure effect is large not, between the seal face of slip, may be in contact with one another.Taking start-up course as example, rotating speed increases gradually by zero, and hydrodynamic effect strengthens gradually, before rotating speed reaches a certain critical value, the opening force that fluid film self produces is not enough to the whole closing forces of balance, therefore the mixed friction state in existing solid directly to contact between seal face., there is serious impact to sealability in the seal face Contact friction occurring in such slow-speed of revolution process: makes seal face produce larger power, thermal distortion, the service behaviour of impact sealing; May produce surface scratch at end face, cause seal leakage amount to increase; The accumulation of wearing and tearing damages end-face structure, and then reduces the working life of sealing.
The fretting wear occurring in low cruise process in order to reduce hydrodynamic mechanical seal, mainly takes to reduce as far as possible the measure such as the endurance of low cruise or the hydrostatic effects of enhancing seal face.
For the latter in above-mentioned measure, i.e. the hydrodynamic mechanical seal of static pressure enhancement mode, existing method is between seal ring end face, to introduce outside high-pressure liquid, and changes hydrodynamic pressure to adapt to different operating modes by ACTIVE CONTROL.But above-mentioned measure is except carrying out particular design sealing configuration, also need extra air feed or liquid supply equipment and control system of arranging pressurization, have complex structure, cost high, need the shortcomings such as external control.If do not carry out ACTIVE CONTROL, keep outside air feed or liquid supply pressure constant, although can alleviate fretting wear at low-speed stage, after the rated speed reaching at rotating speed, be prone to thickness excessive, leak too much problem.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of mechanical seal device, can be the in the situation that of less change mechanical seal original structure design, directly utilize the pressure of Seal cage to provide static pressure to seal face, rely on the centrifugal force of follow-up ring rotation speed change, automatically control the hydrostatic effects of seal face, thereby in the time of low speed, reduce seal wears and in the time of high speed, avoid too much leakage.
To achieve these goals, the technical solution adopted in the utility model is:
A kind of mechanical seal device, be arranged between the rotating shaft 7 and casing of rotating machinery, comprise stationary seat 9, stationary seat 9 is fixed with casing, the cavity that rotating shaft 7 forms from stationary seat 9, coaxially passes, and stationary ring 3 is sleeved in stationary seat 9, secondary sealing O shape circle 5 and spring 4 are installed between the two, stop pin 8 inserts respectively stationary seat 9 and stationary ring 3, and rotating ring 1 is fixed in rotating shaft 7 by axle sleeve 6 and the shaft shoulder, and the end face of stationary seal ring 3 and rotating ring 1 is parallel and relatively rotate.
Rotating ring 1 is inner along some pressure control cavity bodies 10 that circumferentially distributing, the interior passing hole channel 11 of pressure control cavity body 10 is communicated with rotating ring 1 end face, pressure control cavity body 10 is interior has duct 11 near on the chamber wall of rotating ring 1 external diameter one side, duct 11 is communicated with the high voltage terminal of seal operation, in pressure control cavity body 10, lay pressure control plug 2, pressure control plug 2 has the space moving radially along seal ring in pressure control cavity body 10, in the time moving to pressure control cavity body 10 near rotating ring 1 external diameter one side, can seal aforementioned and duct 11 sealed high pressure end UNICOM completely.
Pressure control cavity 2 in described rotating ring 1 is set to single or multiple according to demand.
Described pressure control plug 2 is spherical, cylindricality or Tapered Column.
The pod apertures quantity of opening on the end face of described rotating ring 1 is single or multiple.
The arbitrary position of pod apertures in end face on the end face of described rotating ring 1, comprises fluting Cao district, Ba Qu or weir district; Or in circular groove.
The utility model can regulate the hydrostatic pressure between seal face automatically according to mechanical seal working speed, controls the opening state of sealing, reduces the wearing and tearing of seal face.
Brief description of the drawings
Fig. 1 is embodiment's 1 of the present utility model structural representation.
Fig. 2 is embodiment's 2 of the present utility model structural representation.
Fig. 3 is embodiment's 3 of the present utility model structural representation.
Fig. 4 is embodiment's 4 of the present utility model structural representation.
Fig. 5 is the embodiment one who convinces discharge orifice at rotating ring end face by patient analysis.
Fig. 6 is the embodiment two who convinces discharge orifice at rotating ring end face by patient analysis.
Fig. 7 is the embodiment three who convinces discharge orifice at rotating ring end face by patient analysis.
Fig. 8 is the embodiment four who convinces discharge orifice at rotating ring end face by patient analysis.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further details.
Embodiment one
With reference to Fig. 1 and Fig. 4, a kind of mechanical seal device, be arranged between the rotating shaft 7 and casing of rotating machinery, comprise stationary seat 9, stationary seat 9 is fixed with casing, the cavity that rotating shaft 7 forms from stationary seat 9, pass coaxially, stationary ring 3 is sleeved in stationary seat 9, secondary sealing O shape circle 5 and spring 4 are installed between the two, stop pin 8 inserts respectively stationary seat 9 and stationary ring 3, prevents that stationary ring 3 from rotating, and rotating ring 1 is fixed in rotating shaft 7 by axle sleeve 6 and the shaft shoulder, rotate with rotating shaft, the end face of stationary seal ring 3 and rotating ring 1 is parallel and relatively rotate.
Rotating ring 1 is inner along some pressure control cavity bodies 10 that circumferentially distributing, the interior passing hole channel 11 of pressure control cavity body 10 is communicated with rotating ring 1 end face, pressure control cavity body 10 is interior has duct 11 near on the chamber wall of rotating ring 1 external diameter one side, duct 11 is communicated with the high voltage terminal of seal operation, in pressure control cavity body 10, lay pressure control plug 2, pressure control plug 2 has the space moving radially along seal ring in pressure control cavity body 10, in the time moving to pressure control cavity body 10 near rotating ring 1 external diameter one side, can seal aforementioned and duct 11 sealed high pressure end UNICOM completely.
Pod apertures position of opening and arrangement, according to the working environment of mechanical seal and performance requirement, can select rotating ring end face zones of different, with reference to Fig. 5, Fig. 6, Fig. 7, Fig. 8.
Working principle of the present utility model is: the pressure control cavity 10 in rotating ring is by water conservancy diversion duct 11, by regional connectivity between the high-pressure area of mechanical seal and seal face, in conjunction with the throttle effect of duct 11 and other runners, hydrostatic pressure effect between seal face is strengthened.When hydrodynamic effect is weak when being sealed in operation under the slow-speed of revolution, give opening force by above-mentioned extra introducing static pressure necessarily to compensate, stationary ring 3 can be opened under lower rotating speed, disengage friction phase, thereby reduce the wearing and tearing of seal ring.By multiple above-mentioned pressure control cavities are circumferentially set at rotating ring 1, pressure distribution is even everywhere to make end face.Quantity and the arrangement of pod apertures are rationally set at rotating ring end face, can effectively strengthen above-mentioned compared with the effect of less wear.
Pressure control plug 2 in cavity is ball plug.In the time that rotating speed is lower, the centrifugal force of pressure control plug 2 is less than the power of inside and outside differential pressure to its generation, and the fluid that therefore pressure control plug 2 can not blocked above-mentioned introducing hydrostatic pressure flows, but can flow cause certain flow resistance, forms certain throttling action.When rotating speed is increased to while exceeding a certain critical value, the centrifugal force of controlling plug 2 will be greater than differential pressure action power thereon, pressure control plug 2 will block the through flow hole of chamber lid 1 completely, between seal face no longer with zone of high pressure UNICOM, additional hydrostatic effects disappears completely, sealing, by the dynamic pressure and the hydrostatic effects work that rely on end face trench structure self to produce completely, prevents that thickness is excessive, leaks too much.Said process realized under the slow-speed of revolution, introduce static pressure make sealing open in advance to reduce wear, after entering normal working speed, stop introducing the function of static pressure to reduce to leak, and this function is regulated automatically by rotating speed completely, do not need external control, there is the adaptive intelligent function of rotating speed.Shut down in moderating process and various speed-change process in sealing, when seal face weares and teares minimizing and high speed when identical principle also makes low speed, avoid leaking too much.
Embodiment two
The present embodiment is identical with embodiment one basic structure, and difference is the structure in pressure control cavity 2, and in this example, pressure control plug 2 is cylindrical plag or the conical plug with sphenocephaly, as shown in Figure 2.
Embodiment three
Sealing in the present embodiment is made up of face-to-face opposed two cover sealings, and the basic structure of every suit sealing is identical with the single-stage sealing in embodiment one.Both share a rotating ring 1, have and the pod apertures of pressure control cavity UNICOM on two end faces of rotating ring 1, match respectively with the stationary ring 3 of two covers sealings.
Embodiment four
The present embodiment is identical with embodiment two basic structure, and difference is that embodiment one sealing is inner flow seal, and zone of high pressure is positioned at seal outer diameter place, and fluid flow direction points to internal diameter direction, and open to rotating ring 1 outer radius in the duct of pressure control cavity and zone of high pressure UNICOM.And embodiment four the outer-flowing type that is sealed into seals, zone of high pressure is positioned at seal inner diameter place, and fluid flow direction points to external diameter direction, and open to rotating ring 1 inner radius in the duct of pressure control cavity and zone of high pressure UNICOM.
Implementing sealing of the present utility model total arrangement can be various ways: single sealing, face-to-face formula double-sealing, back-to-back double-sealing, two-stage series connection sealing, three grades of series seals, the double-sealing of formula combined or single sealing and two-stage series connection seal combined sealing etc. with single sealing.
Implementing seal face structure of the present utility model can be various ways: end face has deep trouth, end face has shallow slot and laser surface texture etc.The form of deep trouth comprises lineal shape, semicircle, crescent shape, rectangle and other various forms of deep trouths.The form of shallow slot comprises spirality, lineal shape, V-arrangement, circular arc, T shape and other various forms of shallow slots.The form of laser surface texture comprises circular port, rectangular opening, tri-angle-holed and other various forms of texture holes.
Claims (5)
1. a mechanical seal device, be arranged between the rotating shaft (7) and casing of rotating machinery, it is characterized in that, comprise stationary seat (9), stationary seat (9) is fixed with casing, the cavity that rotating shaft (7) forms from stationary seat (9), pass coaxially, stationary ring (3) is sleeved in stationary seat (9), secondary sealing O shape circle (5) and spring (4) are installed between the two, stop pin (8) inserts respectively stationary seat (9) and stationary ring (3), rotating ring (1) is fixed in rotating shaft (7) by axle sleeve (6) and the shaft shoulder, the end face of stationary seal ring (3) and rotating ring (1) is parallel and relatively rotate,
Rotating ring 1 is inner along the some pressure control cavity bodies (10) that circumferentially distributing, the interior passing hole channel of pressure control cavity body (10) (11) is communicated with rotating ring 1 end face, in pressure control cavity body (10), have duct (11) near on the chamber wall of rotating ring (1) external diameter one side, duct (11) is communicated with the high voltage terminal of seal operation, in pressure control cavity body (10), lay pressure control plug (2), pressure control plug (2) has the space moving radially along seal ring in pressure control cavity body (10).
2. a kind of mechanical seal device according to claim 1, is characterized in that, the pressure control plug (2) in described rotating ring (1) is set to single or multiple according to demand.
3. a kind of mechanical seal device according to claim 1, is characterized in that, described pressure control plug (2) is spherical, cylindricality or Tapered Column.
4. a kind of mechanical seal device according to claim 1, is characterized in that, the pod apertures quantity of opening on the end face of described rotating ring (1) is single or multiple.
5. a kind of mechanical seal device according to claim 1, is characterized in that, the arbitrary position of pod apertures in end face on the end face of described rotating ring (1) comprises fluting Cao district, Ba Qu or weir district; Or in circular groove.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201420126010.5U CN203784293U (en) | 2014-01-26 | 2014-03-19 | Mechanical sealing device |
Applications Claiming Priority (3)
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CN201420051428.4 | 2014-01-26 | ||
CN201420051428 | 2014-01-26 | ||
CN201420126010.5U CN203784293U (en) | 2014-01-26 | 2014-03-19 | Mechanical sealing device |
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CN203784293U true CN203784293U (en) | 2014-08-20 |
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CN201420126010.5U Expired - Fee Related CN203784293U (en) | 2014-01-26 | 2014-03-19 | Mechanical sealing device |
CN201410103540.2A Active CN103836196B (en) | 2014-01-26 | 2014-03-19 | A kind of rotating speed self-adapting intelligent type hydrodynamic mechanical seal device |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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CN201410103540.2A Active CN103836196B (en) | 2014-01-26 | 2014-03-19 | A kind of rotating speed self-adapting intelligent type hydrodynamic mechanical seal device |
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CN (2) | CN203784293U (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103836196A (en) * | 2014-01-26 | 2014-06-04 | 清华大学 | Intelligent fluid dynamic pressure mechanical seal device achieving rotating speed self-adaption |
WO2019165740A1 (en) * | 2018-02-27 | 2019-09-06 | 清华大学 | Adjustable mechanical sealing device |
CN111022647A (en) * | 2019-11-22 | 2020-04-17 | 利辛县宝隆橡塑密封件有限责任公司 | Rubber-plastic sealing element for automobile engine |
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CN112923060B (en) * | 2021-02-04 | 2023-05-23 | 河北华通重工机械制造有限公司 | Multi-end-face self-regulation and starting steam turbine shaft end sealing method |
CN112923061B (en) * | 2021-02-04 | 2023-05-16 | 河北华通重工机械制造有限公司 | Multi-end-face self-regulating and starting steam turbine shaft end sealing device |
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Family Cites Families (8)
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US5193974A (en) * | 1991-07-01 | 1993-03-16 | Bw/Ip International, Inc. | Dynamic pressure recovery seal |
JP2994270B2 (en) * | 1996-08-09 | 1999-12-27 | 日本ピラー工業株式会社 | Non-contact type mechanical seal |
CN2432391Y (en) * | 2000-06-13 | 2001-05-30 | 石油大学(华东) | Linear fluid dynamic channel upstream pumping machine seal |
US8585060B2 (en) * | 2007-11-20 | 2013-11-19 | Eagle Industry Co., Ltd. | Tandem 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 |
CN101776152B (en) * | 2010-03-05 | 2013-08-21 | 北京化工大学 | Outside pressurized type dynamic and static pressure gas lubricating and sealing device |
CN103267132B (en) * | 2013-05-28 | 2015-08-05 | 南京林业大学 | From the mechanical seal of pumping Hydrodynamic pressure type |
CN203784293U (en) * | 2014-01-26 | 2014-08-20 | 清华大学 | Mechanical sealing device |
-
2014
- 2014-03-19 CN CN201420126010.5U patent/CN203784293U/en not_active Expired - Fee Related
- 2014-03-19 CN CN201410103540.2A patent/CN103836196B/en active Active
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103836196A (en) * | 2014-01-26 | 2014-06-04 | 清华大学 | Intelligent fluid dynamic pressure mechanical seal device achieving rotating speed self-adaption |
CN103836196B (en) * | 2014-01-26 | 2016-04-13 | 清华大学 | A kind of rotating speed self-adapting intelligent type hydrodynamic mechanical seal device |
WO2019165740A1 (en) * | 2018-02-27 | 2019-09-06 | 清华大学 | Adjustable mechanical sealing device |
CN111022647A (en) * | 2019-11-22 | 2020-04-17 | 利辛县宝隆橡塑密封件有限责任公司 | Rubber-plastic sealing element for automobile engine |
CN111022647B (en) * | 2019-11-22 | 2021-06-25 | 利辛县宝隆橡塑密封件有限责任公司 | Rubber-plastic sealing element for automobile engine |
Also Published As
Publication number | Publication date |
---|---|
CN103836196B (en) | 2016-04-13 |
CN103836196A (en) | 2014-06-04 |
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C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20170319 |
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CF01 | Termination of patent right due to non-payment of annual fee |