CN104235372A - Dynamic pressure tank mechanical seal structure with improved liquid film cavitation characteristic - Google Patents
Dynamic pressure tank mechanical seal structure with improved liquid film cavitation characteristic Download PDFInfo
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- CN104235372A CN104235372A CN201410445507.8A CN201410445507A CN104235372A CN 104235372 A CN104235372 A CN 104235372A CN 201410445507 A CN201410445507 A CN 201410445507A CN 104235372 A CN104235372 A CN 104235372A
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- dynamic pressure
- groove
- pressure tank
- mechanical seal
- pressure groove
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Abstract
The invention relates to a dynamic pressure tank mechanical seal structure capable of effectively improving microclearance liquid film cavitation characteristic of a sealing end surface. The dynamic pressure tank mechanical seal structure comprises a movable ring and a static ring of a mechanical seal and is structurally characterized in that the inner diameter side of the sealing end surface of the movable ring or the static ring is provided with a novel dynamic pressure tank symmetrically distributed relative to a rotation center; the dynamic pressure tank consists of two groove types, the direction of a dynamic pressure tank 1 is opposite to the rotation direction of the mechanical seal and a common upstream pumping dynamic pressure tank; a dynamic pressure tank 2 is formed along a pumping inlet of the dynamic pressure tank 1 and is opposite to the dynamic pressure tank 1; the combination of the dynamic pressure tank 1 and the dynamic pressure tank 2 is the novel dynamic pressure tank provided by the invention; by use of the pumping effect of the dynamic pressure tank 2, a low-pressure region, namely a cavitation region, at the root of the dynamic pressure tank 1 is reduced, so that the cavitation characteristic of a liquid film is improved, the sealing stability is improved and cavitation phenomena are reduced. The seal structure is applicable to the field of mechanical seals of all liquid media, especially high-temperature, high-pressure and high-speed working conditions which easily cause serious cavitation.
Description
Technical field
The present invention relates to fluid machinery sealing technique and cavitation theory, specifically refer to utilize two kinds of different dynamic pressure grooveds be combined to form a kind of new dynamic pressure groove, the effective Cavitation Characteristics improving seal face microgap liquid film, reduce the cavitation erosion of end face, the stability and the prolonged mechanical that improve sealing seal working life.
Background technique
Along with the development of industrial technology, the service condition for mechanical seal is day by day harsh, has higher requirement to its performance, is mainly manifested in that serviceability temperature scope is wide, speed up, high-pressure trend, to the requirement of sealing material and working life also more and more stricter.Also there is some novel mechanical sealing technologies in recent years, as: surface modifications technology, control equilibrium ratio, multi-end surface combination seal, monitoring sealing, Magneticfluid Seal Technique, nanosecond science and technology material modification etc.
In surface modifications technology, occur that with nick chamber and dynamic pressure groove be representational surface modifications technology, Israel professor Etsion.I proposes the mechanical seal that surface has micro lubricative pores the earliest, be conducive to producing dynamic pressure effect and improve lubricating status, but in reduction leakage rate problem effect not obvious.Nineteen sixty-eight, Crane John Inc. Jia Dena developed arc surface non-contacting spiral groove mechanical seal, and obtain U. S. Patent 3499653, the said firm also been proposed upstream pumping mechanical seal in the 11 international pump forum subsequently.After this, surface modifications technology obtains development at full speed, and domestic and international technician proposes the end face shape structures such as arc groove, Y shape spiral chute, herringbone spiral groove, rectangle groove.Wherein, Chinese patent 96216242.6 discloses a kind of double-loop spiral-slot mechanical seal, increases the bearing capacity of fluid film to a certain extent.Chinese patent 2534428Y discloses a kind of single-row cross fluid dynamic pressure tank upstream pumping mechanical seal, has good moment unlatching ability.Chinese patent 202597706U, 203285989U and 103122998A disclose imitative flowers and plants fluid type, the imitative non-contacting mechanical seal such as pinion groove and the streamlined groove of imitative sharkskin respectively, improve the bearing capacity of sealing and the rigidity of fluid film.Chinese patent 103471771A discloses the visual multifunctional containment testing apparatus of a kind of cavitation, intuitively can observe the cavitation phenomenon of lubricating liquid film, accurately, comprehensively tests various sealability parameter.Chinese patent 103527792A discloses a kind of upstream pumping mechanical seal rotating ring and face type groove thereof, can effectively reduce negative pressuren zone area, improves bearing capacity, has good sealing effect.
But between the seal face run up, the runner caused due to seal face micro forming, distortion etc. shrinks and expansion, easily causes microgap liquid film to produce cavitation phenomenon.Spiral chute is the structure of best performance in single type groove, found that according to cfdrc and related experiment: due to the comprehensive function of pump action and dynamic pressure effect, negative pressure appearance is there is in spiral chute internal diameter inlet edge section, when pressure is lower than saturation pressure, namely there is cavitation phenomenon.In liquid lubrication mechanical seal, the existence of cavitation phenomenon, seal face fluid film is made to lose bearing capacity because positive/negative pressure offsets, but under high speed conditions, serious cavitation phenomenon can be there is, when after the degree that cavitation reaches certain, end face will be caused to lose opening force, seal face wearing and tearing aggravation even makes seal failure.And, along with cavity development and crumble and fall, also can, at seal face generation cavitation phenomenon, sealing surfaces be damaged.In the analytical calculation of Current mechanical sealing theory and actual product specification, great majority all have ignored cavitation phenomenon, and this situation has become one of high-performance mechanical sealing technique obstacle realizing new breakthrough.
Summary of the invention
Based on the problems referred to above, object of the present invention makes up the deficiency in prior art and proposes, it is a kind of novel dynamic pressure groove non-contacting mechanical seal structure, it does not mainly consider the problem of cavitation phenomenon for the design of existing Hydrodynamic pressure type mechanical seal, propose a kind of effective dynamic pressure groove mechanical seal structure improving seal face microgap liquid film Cavitation Characteristics, ensure sealability.
For achieving the above object, the surface that the present invention relates generally to seal face changes shape problem, on the basis of the upstream pumping mechanical seal dynamic pressure groove of routine, a kind of Novel movable indent structure proposed, it is characterized in that: Novel movable indent structure is combined by dynamic pressure groove 1 and dynamic pressure groove 2, wherein dynamic pressure groove 1 and dynamic pressure groove 2 grooved can be spiral line types, circular arc line style, bias type, T font, chevron shaped, or the combination of not synteny, and dynamic pressure groove 1 groove width weir is wide compares γ
1=0.5 ~ 1, β is compared in groove footpath
1=0.3 ~ 0.6, groove number N
g=6 ~ 20, groove depth can circumferentially linearly restrain or the change in stepped ramp type.Dynamic pressure groove 2 groove width weir is wide compares γ
2=1 ~ 1.2 γ
1, β is compared in groove footpath
2=0.5 ~ 0.8 β
1, groove number is the same with dynamic pressure groove 1, and the starting point of dynamic pressure groove 2 is the Pump Suction Nozzle of dynamic pressure groove 1, and the two kinds of parameter that grooved is concrete needs carry out optimal design according to the operating conditions of reality and dielectric property.
Effect of the present invention is mainly: the dynamic pressure groove of improvement seal face microgap liquid film Cavitation Characteristics proposed by the invention, namely on dynamic pressure groove 1 basis of routine, the direction dynamic pressure groove contrary with dynamic pressure groove 12 is offered from seal face internal diameter Pump Suction Nozzle, utilize the pump action of dynamic pressure groove 2 to improve the pressure of the negative pressure region at dynamic pressure groove 1 groove root edge, reduce cavitation zone, improve liquid film bearing capacity.By under identical operating conditions, the Novel movable indent propose the present invention and conventional single dynamic pressure groove 1 have carried out numerical simulation calculation, and its performance such as liquid film stiffness and opening force is all better than single dynamic pressure groove 1.
Accompanying drawing explanation
Fig. 1 routine offer spiral fluted upstream pumping mechanical seal schematic diagram
The Novel movable indent machinery sealed structural representation that Fig. 2 the present invention proposes
The 1/N that Fig. 3 the present invention proposes
gnovel movable indent machinery sealed structural representation
The Novel movable indent mechanical seal schematic three dimensional views that Fig. 4 the present invention proposes
Embodiment
The dynamic pressure groove of the improvement seal face microgap liquid film Cavitation Characteristics that the present invention proposes is opened on mechanical sealing linkage ring end face, the processes end face micro forming such as electrochemical corrosion, electricity cremate, laser beam machining can be adopted, utilize non-contact optical profilers to detect machining accuracy.
What Figure 1 shows that routine offers spiral fluted upstream pumping mechanical seal structural drawing, the grooved of dynamic pressure groove 1 is log spiral, the Novel movable indent that the present invention proposes is then improve on the basis of dynamic pressure groove 1, as shown in Figure 2, mechanical sealing linkage ring is offered along the symmetrical Novel movable indent of rotating center, comprise dynamic pressure groove 1 and dynamic pressure groove 2, wherein, dynamic pressure groove 1 grooved is log spiral 3, helixangleθ=18 °, and groove width weir is wide compares γ
1=1, β is compared in groove footpath
1=0.5, groove number N
g=12, groove depth h
1=3 μm.The grooved of dynamic pressure groove 2 is the direction log spiral 4 and 5 contrary with dynamic pressure groove 1, and boundary line is circular arc line 6 and log spiral 3 respectively, and groove width weir is wide compares γ
2=1, β is compared in groove footpath
2=0.25, groove depth h
2=3 μm, concrete structure as shown in Figure 3.
The above; only enumerating the way of realization that the present invention conceives; not any type of restriction is done to the present invention; protection scope of the present invention comprises those skilled in the art and conceives thinkable equivalent technologies means according to the present invention; allly according to the present invention, the change of any equivalent variations, modification and differentiation etc. are done to above embodiment, all belong to protection scope of the present invention.
Claims (4)
1. one kind is improved the dynamic pressure groove mechanical seal structure of liquid film Cavitation Characteristics, comprise rotating ring and the stationary ring of mechanical seal, it is characterized in that: described rotating ring or stationary ring end face internal side diameter offer about the symmetrical Novel movable indent of rotating center, and described Novel movable indent is made up of dynamic pressure groove 1 and dynamic pressure groove 2.
2. the dynamic pressure groove mechanical seal structure improving liquid film Cavitation Characteristics according to claim 1, it is characterized in that: described dynamic pressure groove 1 grooved can be spiral line type, circular arc line style, bias type, T font, chevron shaped, or the combination of not synteny, its groove is opened in end face downstream, groove depth h
1=3 ~ 8 μm, groove width weir is wide compares γ
1=0.5 ~ 1, β is compared in groove footpath
1=0.3 ~ 0.6, groove number N
g=6 ~ 20, groove depth can circumferentially linearly restrain or the change in stepped ramp type.
3. the dynamic pressure groove mechanical seal structure improving liquid film Cavitation Characteristics according to claim 1, it is characterized in that: described dynamic pressure groove 2 grooved can be spiral line type, circular arc line style, bias type, T font, chevron shaped, or the combination of not synteny, the starting point of groove is the Pump Suction Nozzle of dynamic pressure groove 1, groove depth h
2=3 ~ 8 μm, groove width weir is wide compares γ
2=1 ~ 1.2 γ
1, β is compared in groove footpath
2=0.5 ~ 0.8 β
1, groove number is the same with dynamic pressure groove 1.
4. the dynamic pressure groove mechanical seal structure improving liquid film Cavitation Characteristics according to claim 1, is characterized in that: dynamic pressure groove 1 groove depth h
1with dynamic pressure groove 2 groove depth h
2relation and choosing of other grooved parameters need to carry out optimal design according to the operating conditions of reality and dielectric property.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410445507.8A CN104235372A (en) | 2014-08-29 | 2014-08-29 | Dynamic pressure tank mechanical seal structure with improved liquid film cavitation characteristic |
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| CN201410445507.8A CN104235372A (en) | 2014-08-29 | 2014-08-29 | Dynamic pressure tank mechanical seal structure with improved liquid film cavitation characteristic |
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| CN104235372A true CN104235372A (en) | 2014-12-24 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952902A (en) * | 2016-06-20 | 2016-09-21 | 成都通密封股份有限公司 | Mechanical seal |
| CN106439037A (en) * | 2016-11-18 | 2017-02-22 | 西华大学 | Seal ring and mechanical seal device with combination groove end |
| CN107218395A (en) * | 2017-07-06 | 2017-09-29 | 浙江工业大学 | Ternary distorts type groove end surface mechanical sealing structure |
| CN109630685A (en) * | 2018-11-13 | 2019-04-16 | 扬州弘跃机械有限公司 | A kind of axial-flow pump double mechanical seal |
| CN110822084A (en) * | 2019-11-19 | 2020-02-21 | 潍柴动力股份有限公司 | Sealing member and engine |
| CN114922978A (en) * | 2022-06-13 | 2022-08-19 | 江苏海洋大学 | Liquid membrane sealing ring with super-hydrophilic, super-smooth and flow guide characteristics and processing method thereof |
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| WO2012125714A1 (en) * | 2011-03-15 | 2012-09-20 | Flowserve Management Company | Tapered channel macro/micro feature for mechanical face seals |
| CN103267132A (en) * | 2013-05-28 | 2013-08-28 | 南京林业大学 | Self-pumping fluid-dynamic-pressure-type mechanical seal |
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| CN1828098A (en) * | 2006-01-27 | 2006-09-06 | 浙江工业大学 | Non-contact mechanical end face sealing structure |
| CN201225401Y (en) * | 2008-07-04 | 2009-04-22 | 沈阳北碳密封有限公司 | Spiral groove end plane adverse current mechanical sealing device |
| WO2012125714A1 (en) * | 2011-03-15 | 2012-09-20 | Flowserve Management Company | Tapered channel macro/micro feature for mechanical face seals |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952902A (en) * | 2016-06-20 | 2016-09-21 | 成都通密封股份有限公司 | Mechanical seal |
| CN106439037A (en) * | 2016-11-18 | 2017-02-22 | 西华大学 | Seal ring and mechanical seal device with combination groove end |
| CN107218395A (en) * | 2017-07-06 | 2017-09-29 | 浙江工业大学 | Ternary distorts type groove end surface mechanical sealing structure |
| CN109630685A (en) * | 2018-11-13 | 2019-04-16 | 扬州弘跃机械有限公司 | A kind of axial-flow pump double mechanical seal |
| CN110822084A (en) * | 2019-11-19 | 2020-02-21 | 潍柴动力股份有限公司 | Sealing member and engine |
| CN110822084B (en) * | 2019-11-19 | 2021-12-21 | 潍柴动力股份有限公司 | Sealing member and engine |
| CN114922978A (en) * | 2022-06-13 | 2022-08-19 | 江苏海洋大学 | Liquid membrane sealing ring with super-hydrophilic, super-smooth and flow guide characteristics and processing method thereof |
| CN114922978B (en) * | 2022-06-13 | 2023-10-24 | 江苏海洋大学 | Liquid film sealing ring with super-philic, super-smooth and diversion characteristics and processing method thereof |
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Application publication date: 20141224 |