CN106763778B - A kind of upstream pumping mechanical seal ring with multiple coil slot - Google Patents
A kind of upstream pumping mechanical seal ring with multiple coil slot Download PDFInfo
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- CN106763778B CN106763778B CN201611139252.8A CN201611139252A CN106763778B CN 106763778 B CN106763778 B CN 106763778B CN 201611139252 A CN201611139252 A CN 201611139252A CN 106763778 B CN106763778 B CN 106763778B
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- slot
- multiple coil
- pressure side
- mechanical seal
- helicla flute
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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
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- General Engineering & Computer Science (AREA)
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Abstract
The present invention relates to a kind of upstream pumping mechanical seal rings with multiple coil slot, multiple multiple coil slots along the distribution of end face even circumferential are provided on end face, multiple coil channel opening is in end face low-pressure side, the circumferential width and depth of every grade of helicla flute are successively decreased from low-pressure side to high-pressure side, convergence gap is integrally formed, this all considerably increases end face hydrodynamic effect, so that the frictional resistance of mechanical seal during operation reduces, service life is greatly extended.
Description
Technical field
The present invention relates to a kind of upstream pumping mechanical seal rings with multiple coil slot, belong to mechanical sealing technology neck
Domain, the axle envelope especially suitable for the various rotating machineries such as pump, compressor, reaction kettle.
Background technique
In recent years, in order to improve the lubricating status and service life of seal face in mechanical seal, there are various utilizations
The special machine sealing structure of fluid dynamic and static pressure effect, including upstream pumping mechanical seal.So-called " pumping " is exactly
Pumping groove by the certain shapes opened up on seal face pumps sealing low pressure side buffering liquid or a small amount of leakage liquid
It is the most typical with helicla flute in all kinds of pumping grooves to high-pressure side and in the majority with single step helical slot.But fluid passes through single step helical
Dynamic pressure effect caused by slot is limited, makes the bearing capacity of mechanical seal fluid film or keeps non-contacting ability limited, is easy
The contact wear that end face occurs, largely counteracts the anti-attrition advantage of opened pumping groove, and causing starting to stop, effect is poor, holds
Surface wear and service life are short.
Summary of the invention
The purpose of the present invention is to provide a kind of upstream pumping mechanical seal rings with multiple coil slot, which can
The hydrodynamic effect of mechanical seal is effectively improved, friction and wear degree caused by mechanical seal end surface directly contacts is reduced,
So that the service life of mechanical seal is greatly extended.
The technical scheme is that
A kind of upstream pumping mechanical seal ring with multiple coil slot, the side of sealing ring end face is high-pressure side, another
Side is low-pressure side, and 3 ~ 25 multiple coil slots along the distribution of end face even circumferential are provided on sealing ring end face, and multiple coil slot is opened
Mouth forms seals dam in unslotted region in end face low-pressure side, sealing ring end face；Preferably, 5 ~ 18 are provided on sealing ring end face
Along the multiple coil slot of end face even circumferential distribution；
The series of each multiple coil slot is 2 ~ 10 grades；
Every level-one helicla flute is made of the equal log spiral of helical angle, helical angleα0 ° of < ∣ of rangeα∣ <
90°；Preferably, 10 ° ≤ ∣α∣≤30°；
The circumferential width of every grade of helicla flute is successively decreased step by step from low-pressure side to high-pressure side, forms convergence gap, and adjacent two-stage is handed over
Opposite on high-tension side side, cell wall are concavely formed angle into slot at boundaryθ, 0 ° of <θ90 ° of <；Preferably, 70 ° of <θ85 ° of <；
Every grade of helicla flute is close to the corresponding central angle of circumferential lengths of low-pressure sideβ, 10 ° of <β45 ° of <,βAngle from low
Pressure side reduces step by step to high-pressure side；
The depth of multiple coil slothIt is 1 ~ 100 μm, successively decreases step by step from low-pressure side to high-pressure side, i.e.,h n<h n-1, same to level-one
The groove depth of slot does not change.
Upstream pumping mechanical seal ring of the present invention with multiple coil slot can be used as dynamic in mechanical seal structure
Ring or stationary ring or rotating ring and stationary ring are the sealing ring simultaneously.
Upstream pumping mechanical seal ring end face of the present invention with multiple coil slot, can be used electrochemical corrosion, electricity
The techniques such as spark, laser processing process end face micro forming, detect machining accuracy using non-contact optical profilers.
Working principle of the present invention: at runtime, the fluid sealed enters in slot sealing ring, due to unslotted on sealing ring
Part constitute seals dam throttling action, cause enter slot in Fluid pressure increase, under the promotion of this pressure, rotating ring with
Stationary ring mutually separates, and one layer of very thin fluid film is formed, to form non-contacting seal between making seal face.
The beneficial effects of the present invention are:
1, the convergence structure that the circumferential width of helicla flutes at different levels becomes narrow gradually from low-pressure side to high-pressure side facilitates fluid Jie
The reduced overall of matter is pressurized；The depth of helicla flutes at different levels is gradually reduced from low-pressure side to high-pressure side, so that intersection at different levels occurs
Stairstepping facilitates the partial Pressure of fluid media (medium)；What helicla flute junctions at different levels were formedθAngle is between typical three-dimensional restrains
Gap further increases the compression of fluid medium；To enable seal face to be radially formed multiple higher-pressure regions, enhance
The dynamic pressure effect of fluid film increases the unlatching performance of sealing, ensure that the stability of sealing operation；
2, multiple coil slot can fluid medium generate stronger compression effectiveness, to have more preferably hydrodynamic effect
It answers, so that the bearing capacity under being sealed in high-speed working condition is stronger, effectively improves the lubricating status of mechanical seal end surface, reduce
The fretting wear degree of seal face, extends the working life of sealing element, ensure that the operation steady in a long-term of equipment, eliminates
The security risk of equipment.
Detailed description of the invention
Fig. 1 is the schematic diagram of the upstream pumping mechanical seal ring described in embodiment 1 with three-level helicla flute；
Fig. 2 is the partial enlargement diagram of the upstream pumping mechanical seal ring described in embodiment 1 with three-level helicla flute；
Fig. 3 is that upstream pumping mechanical seal ring described in embodiment 1 with the three-level helicla flute line A-A along Fig. 2 cuts open
Face figure；
In figure: 1- first order helicla flute, the second level 2- helicla flute, 3- third level helicla flute,αConstitute the logarithm of helicla flute
The helical angle of helix,β 1First order helicla flute close to low-pressure side the corresponding central angle of circumferential lengths,β 2Second level helicla flute
The corresponding central angle of circumferential lengths of close low-pressure side,β 3Circumferential lengths corresponding circle of the third level helicla flute close to low-pressure side
Heart angle,θ 1What first order helicla flute and the opposite on high-tension side side cell wall of second level helicla flute intersection were concavely formed into slot
Angle,θ 2The angle that second level helicla flute and the opposite on high-tension side side cell wall of third level helicla flute intersection are concavely formed into slot.
Specific embodiment
Embodiment 1
As shown in Figure 1-3, a kind of upstream pumping mechanical seal ring with three-level helicla flute, the outside diameter of sealing ring end face
For high-pressure side, internal side diameter is low-pressure side, be provided on sealing ring end face 6 along end face even circumferential distribution three-level helicla flutes, three
Grade helicla flute is opened on end face low-pressure side, and unslotted region forms seals dam on sealing ring end face；
Every level-one helicla flute in three-level helicla flute is made of the equal log spiral of helical angle, helical angleαFor
15°；
The circumferential width of three-level helicla flute is successively decreased step by step from low-pressure side to high-pressure side, forms convergence gap；First order spiral
Slot 1 and the opposite on high-tension side side of 2 intersection of second level helicla flute, cell wall are concavely formed angle into slotθ 1,θ 1It is 83 °, the second level
Helicla flute 2 and the opposite on high-tension side side of 3 intersection of third level helicla flute, cell wall are concavely formed angle into slotθ 2,θ 2It is 80 °；
First order helicla flute 1 is close to the corresponding central angle of circumferential lengths of low-pressure sideβ 1,β 1It is 30 °, second level helicla flute
2 are close to the corresponding central angle of circumferential lengths of low-pressure sideβ 2,β 2It is 22 °, third level helicla flute 3 is long close to the circumferential direction of low-pressure side
Spending corresponding central angle isβ 3,β 3It is 15 °；
The depth of first order helicla flute 1h 1It is 80 μm, the depth of second level helicla flute 2h 2It is 60 μm, third level helicla flute 3
Depthh 3It is 40 μm, the groove depth with first-stage tank does not change.
Compared with equivalent single step helical slot: setting the internal diameter of single step helical groove sealing ring and three-level spiral groove seal ringR i=
20mm, slot root radiusR g=27mm, outer diameterR o=30mm, helical angleα=15 °, slot number 6, balancing film thickness ish b=10μm.Institute is different
, every grade of groove depth of three-level helicla flute is respectivelyh 1=80 μm,h 2=60 μm,h 3It=40 μm, is equivalent to single step helical groove deep and takes three
The average value of grade groove depth, as 60 μm.And sealed medium densityρ=1000kg/m3, viscosityμ=8.01×10-4Pas, sealing
Ring revolving speedω=300rad/s, pressure at outer diameterp o=501325Pa, inner radius pressurep i=101325Pa。
Single step helical groove sealing ring face opening powerF oFor 412N, leakage rateS tIt is 1.37 × 10-3kg/s；Three-level helicla flute
Sealing ring face opening powerF oFor 442N, leakage rateS tIt is 1.32 × 10-3kg/s；It can be seen that three-level spiral groove seal ring ratio
Single step helical groove sealing ring has stronger bearing capacity, and this effectively improves the lubricating status of mechanical seal end surface, reduces
The fretting wear degree of seal face, extends the working life of sealing element.Also, three-level spiral groove seal ring is than single-stage spiral shell
The slip of spin slot sealing ring is small, this explanation three-level helixseal ring under identical working condition is more advantageous to the sealing of medium.
Embodiment 2
A kind of upstream pumping mechanical seal ring with multiple coil slot, the outside diameter of sealing ring end face is high-pressure side, interior
Diameter side is low-pressure side, and 10 level Four helicla flutes along the distribution of end face even circumferential are provided on sealing ring end face, and level Four helicla flute is opened
Mouth forms seals dam in unslotted region in end face low-pressure side, sealing ring end face；
Every level-one helicla flute in level Four helicla flute is made of the equal log spiral of helical angle, helical angle be-
15 °, i.e. the hand of spiral with embodiment 1 of log spiral is opposite；
The circumferential width of level Four helicla flute is successively decreased step by step from low-pressure side to high-pressure side, forms convergence gap；First order spiral
Slot and the opposite on high-tension side side of second level helicla flute intersection, the angle that cell wall is concavely formed into slot are 83 °, second level spiral
Slot and the opposite on high-tension side side of third level helicla flute intersection, the angle that cell wall is concavely formed into slot are 80 °；Third level spiral
Slot and the opposite on high-tension side side of fourth stage helicla flute intersection, the angle that cell wall is concavely formed into slot are 77 °；
First order helicla flute is 28 ° close to the corresponding central angle of circumferential lengths of low-pressure side, and second level helicla flute is close to low
The corresponding central angle of circumferential lengths for pressing side is 23 °, circumferential lengths corresponding central angle of the third level helicla flute close to low-pressure side
It is 19 °；Fourth stage helicla flute is 14 ° close to the corresponding central angle of circumferential lengths of low-pressure side；
The depth of first order helicla flute is 90 μm, and the depth of second level helicla flute is 70 μm, the depth of third level helicla flute
It is 50 μm, the depth of fourth stage helicla flute is 30 μm, and the groove depth with first-stage tank does not change.
Compared with equivalent single step helical slot: setting the internal diameter of single step helical groove sealing ring and level Four spiral groove seal ringR i=
20mm, slot root radiusR g=27mm, outer diameterR o=30mm, helical angleα=-15 °, slot number 10, balancing film thickness ish b=10μm.Institute is not
With every grade of groove depth of level Four helicla flute is respectivelyh 1=90 μm,h 2=70 μm,h 3=50 μm,h 4=30 μm, it is equivalent to single step helical
Groove deep takes the average value of level Four groove depth, as 60 μm.And sealed medium densityρ=1000kg/m3, viscosityμ=8.01×10- 4Pas, sealing ring revolving speedω=300rad/s, pressure at outer diameterp o=501325Pa, inner radius pressurep i=101325Pa。
Single step helical groove sealing ring face opening powerF oFor 415N, leakage rateS tIt is 1.34 × 10-3kg/s；Level Four helicla flute
Sealing ring face opening powerF oFor 455N, leakage rateS tIt is 1.33 × 10-3kg/s；It can be seen that level Four spiral groove seal ring ratio
Single step helical groove sealing ring has stronger bearing capacity, and this effectively improves the lubricating status of mechanical seal end surface, reduces
The fretting wear degree of seal face, extends the working life of sealing element.Also, level Four spiral groove seal ring is than single-stage spiral shell
The slip of spin slot sealing ring is small, this explanation level Four helixseal ring under identical working condition is more advantageous to the sealing of medium.
Embodiment 3
A kind of upstream pumping mechanical seal ring with multiple coil slot, the outside diameter of sealing ring end face is high-pressure side, interior
Diameter side is low-pressure side, and 15 eight grades of helicla flutes along the distribution of end face even circumferential are provided on sealing ring end face, and eight grades of helicla flutes are opened
Mouth forms seals dam in unslotted region in end face low-pressure side, sealing ring end face；
Every level-one helicla flute in eight grades of helicla flutes is made of the equal log spiral of helical angle, helical angle be-
15 °, i.e. the hand of spiral with embodiment 1 of log spiral is opposite；
The circumferential width of eight grades of helicla flutes is successively decreased step by step from low-pressure side to high-pressure side, forms convergence gap；First order spiral
Slot and the opposite on high-tension side side of second level helicla flute intersection, the angle that cell wall is concavely formed into slot are 83 °, second level spiral
Slot and the opposite on high-tension side side of third level helicla flute intersection, the angle that cell wall is concavely formed into slot are 83 °；Third level spiral
Slot and the opposite on high-tension side side of fourth stage helicla flute intersection, the angle that cell wall is concavely formed into slot are 80 °；Fourth stage spiral
Slot and the opposite on high-tension side side of level V helicla flute intersection, the angle that cell wall is concavely formed into slot are 80 °, level V spiral
Slot and the opposite on high-tension side side of the 6th grade of helicla flute intersection, the angle that cell wall is concavely formed into slot are 77 °；6th grade of spiral
Slot and the opposite on high-tension side side of the 7th grade of helicla flute intersection, the angle that cell wall is concavely formed into slot are 77 °；7th grade of spiral
Slot and the opposite on high-tension side side of the 8th grade of helicla flute intersection, the angle that cell wall is concavely formed into slot are 74 °；
First order helicla flute is 25 ° close to the corresponding central angle of circumferential lengths of low-pressure side, and second level helicla flute is close to low
The corresponding central angle of circumferential lengths for pressing side is 23 °, circumferential lengths corresponding central angle of the third level helicla flute close to low-pressure side
It is 21 °；Fourth stage helicla flute is 19 ° close to the corresponding central angle of circumferential lengths of low-pressure side；Level V helicla flute is close to low pressure
The corresponding central angle of the circumferential lengths of side is 17 °, and the 6th grade of helicla flute is close to the corresponding central angle of circumferential lengths of low-pressure side
15 °, the 7th grade of helicla flute is 13 ° close to the corresponding central angle of circumferential lengths of low-pressure side；8th grade of helicla flute is close to low-pressure side
The corresponding central angle of circumferential lengths be 11 °；
The depth of first order helicla flute is 90 μm, and the depth of second level helicla flute is 80 μm, the depth of third level helicla flute
It is 70 μm, the depth of fourth stage helicla flute is 60 μm, and the depth of level V helicla flute is 50 μm, and the depth of the 6th grade of helicla flute is
40 μm, the depth of the 7th grade of helicla flute is 30 μm, and the depth of the 8th grade of helicla flute is 10 μm, and the groove depth with first-stage tank does not change.
Compared with equivalent single step helical slot: setting the internal diameter of single step helical groove sealing ring and eight grades of spiral groove seal ringsR i=
20mm, slot root radiusR g=27mm, outer diameterR o=30mm, helical angleα=-15 °, slot number 10, balancing film thickness ish b=10μm.Institute is not
With every grade of groove depth of eight grades of helicla flutes is respectivelyh 1=90 μm,h 2=80 μm,h 3=70 μm,h 4=60 μm,h 5=50 μm,h 6=40 μm,h 7=30 μm,h 8=10 μm, it is equivalent to the average value that single step helical groove deep takes eight grades of groove depths, as 53.75 μm.And it is situated between by sealing
Matter densityρ=1000kg/m3, viscosityμ=8.01×10-4Pas, sealing ring revolving speedω=300rad/s, pressure at outer diameterp o=
501325Pa, inner radius pressurep i=101325Pa。
Single step helical groove sealing ring face opening powerF oFor 430N, leakage rateS tIt is 1.22 × 10-3kg/s；Eight grades of helicla flutes
Sealing ring face opening powerF oFor 452N, leakage rateS tIt is 1.19 × 10-3kg/s；It can be seen that eight grades of spiral groove seal ring ratios
Single step helical groove sealing ring has stronger bearing capacity, and this effectively improves the lubricating status of mechanical seal end surface, reduces
The fretting wear degree of seal face, extends the working life of sealing element.Also, eight grades of spiral groove seal rings are than single-stage spiral shell
The slip of spin slot sealing ring is small, this explanation eight grades of helixseal ring under identical working condition is more advantageous to the sealing of medium.
Content described in above embodiments is only enumerating to the way of realization of inventive concept, protection scope of the present invention
It should not be construed as being limited to the specific forms stated in the embodiments, protection scope of the present invention also includes those skilled in the art
The thinkable equivalent technologies mean of the institute of design according to the present invention.
Claims (10)
1. a kind of upstream pumping mechanical seal ring with multiple coil slot, the side of sealing ring end face is high-pressure side, the other side
For low-pressure side, be provided with multiple multiple coil slots along the distribution of end face even circumferential on sealing ring end face, multiple coil channel opening in
End face low-pressure side, unslotted region forms seals dam on sealing ring end face；
Every level-one helicla flute is made of the equal log spiral of helical angle；
The circumferential width of every grade of helicla flute is successively decreased step by step from low-pressure side to high-pressure side, forms convergence gap, adjacent two-stage intersection
Opposite on high-tension side side, cell wall are concavely formed angle into slotθ；
Every grade of helicla flute is close to the corresponding central angle of circumferential lengths of low-pressure sideβ,βAngle from low-pressure side to high-pressure side step by step
Reduce；
The depth of every grade of helicla flute is successively decreased step by step from low-pressure side to high-pressure side, and the groove depth with first-stage tank does not change.
2. the upstream pumping mechanical seal ring according to claim 1 with multiple coil slot, it is characterised in that: sealing ring
The multiple coil slot opened up on end face is 3 ~ 25.
3. the upstream pumping mechanical seal ring according to claim 2 with multiple coil slot, it is characterised in that: sealing ring
The multiple coil slot opened up on end face is 5 ~ 18.
4. the upstream pumping mechanical seal ring according to claim 1 with multiple coil slot, it is characterised in that: each
The series of multiple coil slot is 2 ~ 10 grades.
5. the upstream pumping mechanical seal ring according to claim 1 with multiple coil slot, it is characterised in that: constitute spiral shell
The helical angle of the log spiral of spin slotαRange be 0 ° of < ∣α90 ° of ∣ <.
6. the upstream pumping mechanical seal ring according to claim 5 with multiple coil slot, it is characterised in that: constitute spiral shell
The helical angle of the log spiral of spin slotαRange be 10 ° ≤ ∣α∣≤30°。
7. the upstream pumping mechanical seal ring according to claim 1 with multiple coil slot, it is characterised in that: adjacent two
The angle that the opposite on high-tension side side cell wall of grade intersection is concavely formed into slotθRange be 0 ° of <θ90 ° of <.
8. the upstream pumping mechanical seal ring according to claim 7 with multiple coil slot, it is characterised in that: adjacent two
The angle that the opposite on high-tension side side cell wall of grade intersection is concavely formed into slotθRange be 70 ° of <θ85 ° of <.
9. the upstream pumping mechanical seal ring according to claim 1 with multiple coil slot, it is characterised in that: every grade of spiral shell
Circumferential lengths corresponding central angle of the spin slot close to low-pressure sideβRange be 10 ° of <β45 ° of <.
10. the upstream pumping mechanical seal ring according to claim 1 with multiple coil slot, it is characterised in that: multistage
The depth of helicla flute is 1 ~ 100 μm.
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| CN109185461A (en) * | 2018-10-26 | 2019-01-11 | 清华大学 | The seal face structure of rotating machinery |
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| CN202091511U (en) * | 2011-05-24 | 2011-12-28 | 纽威数控装备（苏州）有限公司 | Composite type sealing device |
| CN204083241U (en) * | 2014-09-18 | 2015-01-07 | 自贡蜜蜂牌机械密封有限责任公司 | Mechanical seal device |
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| CN206361150U (en) * | 2016-12-12 | 2017-07-28 | 昆明理工大学 | A kind of upstream pumping mechanical seal ring with multiple coil groove |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11852244B2 (en) | 2019-02-04 | 2023-12-26 | Eagle Industry Co., Ltd. | Sliding component and method of manufacturing sliding member |
| US11852241B2 (en) | 2019-02-04 | 2023-12-26 | Eagle Industry Co., Ltd. | Sliding component |
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