CN206802309U - The device of dry gas seals fluting based on the design of bottom land micro forming - Google Patents
The device of dry gas seals fluting based on the design of bottom land micro forming Download PDFInfo
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- CN206802309U CN206802309U CN201720677184.4U CN201720677184U CN206802309U CN 206802309 U CN206802309 U CN 206802309U CN 201720677184 U CN201720677184 U CN 201720677184U CN 206802309 U CN206802309 U CN 206802309U
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Abstract
The utility model discloses the device of the dry gas seals fluting based on the design of bottom land micro forming, including housing and axle, it is characterised in that：The axle outer ring is provided with axle sleeve, and the axle sleeve is externally provided with stationary seat, and the stationary seat is connected with housing, and stationary ring and stop pin are provided between the stationary seat and axle sleeve, and rotating ring is provided with the left of the stationary ring, spring is provided with the right side of the stop pin；The utility model can solve the problems, such as to must take into consideration roughness and flatness precision during Dry Gas Seal Groove processing, reduce processing request and processing cost, simplify processing method and step, optimize trench structure, beneficial to the further commercial Application of dry gas seals.
Description
Technical field
The utility model belongs to sealing ring field, more particularly to a kind of dry gas seals fluting based on the design of bottom land micro forming
Device.
Background technology
In recent years, with raising of the high speed development and people of industry to environmental requirement, the correlations such as oil, petrochemical industry are promoted
Process industrial develops to the direction of pollution-free, long period, low energy consumption, high benefit, and such industrial sealing fluid has mostly
The features such as inflammable, explosive, hypertoxic, seriously polluted, traditional mechanical seal are difficult to the seal request for meeting equipment.And dry gas seals
The outstanding feature of technology is the non-contact and small―gap suture operation that seal interface is realized by very thin pressure air film, thus institute's table
The superior anti-leak characteristic revealed and long-life, low-maintenance characteristic, a weight of advanced technical field of sealing technology is become
Want research direction.
Abroad, the various operating mode dry gas seals such as low pressure, low speed, high pressure, high speed all occupy critical role.In state
Interior, dry gas seals introducing is later, and with foreign countries there is also very big gap, but increasing scientific research personnel just throws oneself into this at present
In the research and development of class water-tight equipment.The main distinction that dry gas seals are sealed in configuration aspects with standard machinery is its rotating ring or stationary ring
The various groove profiles that depth is generally 3 ~ 10 μm are machined with end face, separate seal face by hydrodynamic pressure.Thus, dry gas
The core technology of sealing is in terms of the dynamic pressure mechanism of production and the design and processing of groove profile for being embodied in its micron order groove depth.
During startup or parking, end face air-film thickness and the surface roughness of dry gas seals are the same order of magnitude, normally
Also only it is higher by 1 order of magnitude during operation, therefore the especially relatively large sized bottom land roughness of surface roughness is to sealing
The influence of energy can not be ignored.But because bottom land process technology is high, precision is relatively difficult to ensure card so that inappropriate bottom land roughness is even
Flatness has a strong impact on groove profile practical effect.
Therefore, it is the sharpest edges that play dry gas seals, is emphasizing zero leakage, low abrasion, outside low energy consumption performance, having very much must
To be directed to the microeffect of its bottom land and reasonable grooving method is studied.
To solve the problems, such as Dry Gas Seal roughness, domestic and foreign scholars are carried out in terms of dynamic and static ring end contact model
Substantial amounts of research, it is intended to theoretically disclose influencing mechanism and solution of the surface roughness to sealing property.1978,
Patir etc. proposes the concept of " Average Flow Model ", for studying under isothermy incompressible liquid in three-dimensional rough surface
Partial hydrodynamic lubrication problem in gap, influence of the surface roughness to clearance flow is described by introducing flow factor, is built
PC models are found, the lubricating effect that surface roughness is studied for people provides important means；Afterwards Elrod, Tripp,
Tonder, Hu, Makino etc. make further research and perfect to this model；2004, Wang etc. used mean flow
Movable model and Fast Fourier Transform (FFT) have solved the pressure distribution that liquid oil film contacts with rough peak.For compressible gas, greatly
Even industrial equipment structural analysis National Key Laboratory of Polytechnics appoints dawn and Wu Chengwei etc. based on liquid Average Flow Model
Basic thought, it is deduced the average flow equation of compressible gas static seal and has carried out corresponding leaking rate formulas, by right
The numerical simulation that gas flows in contact gap, analyze the rough surfaces such as surface roughness grain direction, r.m.s. and characterize ginseng
Influence of the number in nominal gas Thickness Variation to quantity of gas leakage and seal pressure, and give rough surface morphology parameter and
Relation between seal pressure and gas seal property.The foundation of the average flow equation of compressible gas static seal, can for research
Compressed gas dynamic sealing provides good reference and basis.
On influence of the surface roughness to dry gas sealing property, domestic related seminar has done much for dry gas seals
Initiative work：Peng Xu east seminar is based on solving compressible flow average Reynolds equation, have studied and does under the conditions of friction speed
Influence of the isotropism surface roughness of hermetic seal end face different zones to sealing gas film stiffness and leakage rate, proposes end face not
Same region（Groove area and Fei Cao areas）Surface roughness it is different to sealing property affecting laws, and point out rotating speed in period
Influence very important；And by further studying, systematically analyze flexi-ring end surfaces, hard ring grooved faces bottom surface with it is non-slotted
Surface roughness influences on Performance of Spiral Groove Dry Gas Seal, the results showed that：Under certain condition, rough surface sealing opening force, gas
Film rigidity and friction torque are all higher than smooth surface, and leakage rate is smaller, within relevant critical field, the hard non-slotted surface of ring
The harder ring fluting bottom surface of influence of the roughness to sealing property parameter prediction value and flexi-ring surface roughness can be ignored, also simultaneously
The preferred value that surface roughness is demonstrated for Spiral Groove Dry Gas Seals by Use end face geometrical structure parameter does not influence；In the recent period, its class
Topic group personnel are corrected also directed to the slip flow effect first-order slip-flow model met on the rough surface of Gaussian Profile, research
Elaborate generation and gas molecule mean free path, the relation of roughness of sliding phenomenon.Song Peng clouds seminar is in recent years for dry
Hermetic seal real gas effect, slip flow effect and interior flow field law study are more deep, coarse for speed operation lower surface
The influence problem to dry gas sealing property is spent to point out：Under the conditions of specific thickness, when the ratio of thickness and roughness root mean square is big
When 3~4, influence of the surface roughness to sealing property can be ignored；Compared with large roughness, opened although sealing
Power, gas film stiffness increase and significantly improved with rotating speed, but leakage rate also substantially increases simultaneously, therefore as rotating speed increases, it is larger
Roughness is harmful to dry gas seals low-speed running performance.
Research for roughness value configuration, after the 1970s, Sayles, Thomas, Majumdar etc.
It was found that milled surface topography has fractal property, then fractal theory is used in the research that surface topography characterizes, to engineering gold
Metal surface pattern carries out Fractal Simulation.These researchs show, will be adopted in the rough surface morphology research description based on fractal theory
With more Fractal scale parameter, the non-intuitive property of these parameters greatly reduces the practicality of model.Zhang Qisheng etc., which is utilized, to be referred to
Number auto-correlation function and digital filtering technique establish two-dimentional roughness surface Statistical Distribution numerical model, and contrast finds to throw
Light granite surface roughness meets the Gauss regularities of distribution.Appoint dawn etc. that there is arbitrary shape auto-correlation also by computer simulation
The random rough surfaces of function, and the numerical computations flowed with Matlab to the two-dimentional leakage path of generation, finally
Go out influence of the surface roughness characteristics to gas pressure flow factor.Sun Jianjun and Wei Long etc. then introduces and studied respectively mechanical close
The contact model of rough surface is sealed, and is established and time correlation, the parallel end faces contacting mechanical seal based on fractal parameter
Leak model.Lv Xiangkui etc. establishes three-dimensional rough surface based on Gauss distribution functions and index auto-correlation function relation
Mathematical modeling, obtain the numerical value rough surface of sealing surface and carried out numerical computations, the work realizes quiet contact sealing knot
The numerical analysis method of structure leakage characteristics qualitative assessment, equally there is directive significance to the high precision design of dry gas sealing structure.
Compared to the method for dividing shape research based on rough surface, the rough surface configuration method based on distribution function have parameter it is simple, can
The advantages that property surveyed is strong, it is more practical in engineering practice.
Design studies about dry gas seals bottom land, Song Wenbo etc. will wait deep spiral groove to be modified to various convergence types and not wait deeply
Helicla flute simultaneously carries out numerical computations, the results showed that and convergence type ladder does not wait the sealing property of deep spiral groove dry gas seals superior,
Control leakage rate aspect more prominent.Zhang Yuelin etc. proposes that one kind deepens T-slot Dry Gas Seal structure, by with it is common etc.
Deep Structure Comparison, it was demonstrated that structure is deepened under the conditions of low speed low pressure or high speed and high pressure more preferable air film supported ability and stably
Property.Liu Kun etc., which also demonstrates certain bottom land and deepens structure by the way that wild goose shape groove dry gas seals deepen with research, can improve end face
Between air film supported ability and stability, the unlatching performances of dry gas seals can be improved.Research shows above, dry gas seals bottom land moulding
There is direct significance for raising of the Journal of Sex Research to sealing property.Slawomir and Andriy passes through to dry gas seals microflute
The change in road, micropore and surface texture, and change of such change to the dynamic attribute of sealing medium layer by numerical analysis
Change, it is indicated that rational design and the selection of surface topography contribute to the raising of dry gas seals stability.It is but domestic by the field
The retrieval of outer document and Patent, be not yet related at present microeffect research of the dry gas seals bottom land interface in order under design and its
Guiding opinion to sealing grooving techniques so that still deposited very between the theoretical research of dry gas seals microgap sealing and practical application
Big gap, the problem of this is urgent need to resolve in dry gas seals commercial Application.
Utility model content
The purpose of the orderly moulding microeffect of dry gas seals bottom land is realized, while is directed to current dry gas seals roughness model
Present in deficiency make improvement, propose a kind of device of the dry gas seals fluting based on the design of bottom land micro forming.
The technical solution adopted in the utility model is as follows：
The device of dry gas seals fluting based on the design of bottom land micro forming, including housing and axle, it is characterised in that：The axle
Outer ring is provided with axle sleeve, and the axle sleeve is externally provided with stationary seat, and the stationary seat is connected with housing, is set between the stationary seat and axle sleeve
There are stationary ring and stop pin, rotating ring is provided with the left of the stationary ring, spring is provided with the right side of the stop pin.
Further, housing O-ring seal is provided between the stationary seat and housing.
Further, rotating ring O-ring is provided between the rotating ring and axle sleeve.
Further, the stationary seat is directly provided with stationary ring O-ring with stationary ring.
Further, the axle sleeve is provided with holding screw.
Further, it is seal cavity between the axle sleeve and housing.
Further, O-ring seal uses micro forming sealing structure circle.
Further, the micro forming sealing structure circle includes spiral flute type, T-slot type and arc-shaped grooves.
The utility model has the advantages that：
Originally it is that utility model can solve to must take into consideration asking for roughness and flatness precision during Dry Gas Seal Groove processing
Topic, processing request and processing cost are reduced, simplify processing method and step, optimized trench structure, enter one beneficial to dry gas seals
Walk commercial Application.
Flow pattern of the utility model according to the specific groove profile of dry gas seals, to improve sealing groove profile dynamic pressure as target, if
Count associated groove bottom micro-structural.For raising groove profile sealing property, reduce leakage, the requirement of reduction grooving techniques, reduction groove profile processing
Cost effectiveness is notable.
Brief description of the drawings
Fig. 1 is the utility model structure diagram.
Fig. 2 is the utility model structure micro forming sealing structure circle.
Fig. 3 is spiral flute type sealing structure circle.
Fig. 4 is T-slot type sealing structure circle.
Fig. 5 is arc-shaped grooves sealing structure circle.
Embodiment
The utility model is described further below in conjunction with the accompanying drawings：
As Figure 1-5, the device of the dry gas seals fluting based on the design of bottom land micro forming, including housing 1 and axle 8, its
It is characterised by：The outer ring of axle 8 is provided with axle sleeve 6, and the axle sleeve 6 is externally provided with stationary seat 3, and the stationary seat 3 is connected with housing 1,
Stationary ring 9 and stop pin 4 are provided between the stationary seat 3 and axle sleeve 6, the left side of stationary ring 9 is provided with rotating ring 12, the stop pin 4
Right side is provided with spring 5.Housing O-ring seal is provided between the stationary seat 3 and housing 1.Between the rotating ring 12 and axle sleeve 6
Provided with rotating ring O-ring.The stationary seat 3 is directly provided with stationary ring O-ring 10 with stationary ring 9.The axle sleeve 6 is provided with clamp screw
Nail.It is seal cavity 13 between the axle sleeve 6 and housing 1；O-ring seal uses micro forming sealing structure circle.
The micro forming sealing structure circle includes spiral flute type, T-slot type and arc-shaped grooves.
Embodiment：
A kind of dry gas seals grooving method based on the design of bottom land micro forming, including AR type two-dimensional digital filtering techniques, institute
It is as follows to state step：
Step 1：Rough surface method based on Gaussian Profile and linear auto-correlation function, filtered using AR types two-dimensional digital
Wave technology；
Step 2：Establish the microcosmic random feature model of simulated slot bottom interface roughness；
Step 3：Based on auto-correlation function rough surface 3D model of the model generation with corresponding random character in step 2
And functional relation is established, the rough surface auto-correlation function is as follows：
Wherein σ is surface Root Mean Square roughness, and τ x, τ y are respectively the time interval on x, y direction, and β x, β y are respectively x, y
Correlation length on direction, as β x=β y, surface is isotropism, and as β x ≠ β y, surface is anisotropy；
Step 4：It is roughness grain direction parameter to define λ r=β x/ β y, is isotropism surface during λ r=1, passes through regulation
β x and β y length ratio can change λ r values, so as to simulate the anisotropic surface with certain textural characteristics.
Step 5：Based on step 4, change λ r values, as λ r>When 1, the surface of generation has cross grain feature, and
λ r values are bigger, and cross grain is more obvious.Conversely, λ r<When 1, the surface with longitudinal textural characteristics can be generated, λ r level off to
When zero, there is obvious longitudinal stripe.
Step 6：According to dry gas seals bottom land Flow Field Distribution rule, all kinds of groove profiles are established（Such as Fig. 3-5）；
Step 7：Based on groove profile（Such as Fig. 3-5）, define λ g be groove profile flow field direction parameter, it is specified that λ g level off to zero when table
The direction of sign and moulding streamline when tangent, it is specified that λ g=1 when be moulding streamline and flow field streamline angle is α=45 degree direction, it is specified that λ
It is moulding streamline and flow field streamline vertical direction during g=λ r-max；It can be changed by adjusting moulding streamline and flow field streamline angle α
Become λ g values, the anisotropic surface with certain textural characteristics is characterized so as to corresponding with λ r；
Step 8：Based on the average flow equation of compressible gas, with reference to the coarse 3D models that quantize, compiled using Matlab
Journey, calculate the flow factor of rough surface gap gas flowing and its relation with grain direction；Calculate sealing dynamic pressure and let out
Leak rate characterisitic parameter, draw the relation between rough surface shape characteristic and characterisitic parameter.
It is described above, only specific embodiment of the present utility model, but the protection domain of utility model is not limited to
This, any those skilled in the art the change that can readily occur in or replace in the technical scope that the utility model discloses
Change, should all cover within the protection domain of utility model.
Claims (8)
1. the device of the dry gas seals fluting based on the design of bottom land micro forming, including housing（1）And axle（8）, it is characterised in that：Institute
State axle（8）Outer ring is provided with axle sleeve（6）, the axle sleeve（6）It is externally provided with stationary seat（3）, the stationary seat（3）With housing（1）Connection,
The stationary seat（3）With axle sleeve（6）Between be provided with stationary ring（9）And stop pin（4）, the stationary ring（9）Left side is provided with rotating ring（12）,
The stop pin（4）Right side is provided with spring（5）.
2. the device of the dry gas seals fluting according to claim 1 based on the design of bottom land micro forming, it is characterised in that：Institute
State stationary seat（3）With housing（1）Between be provided with housing O-ring seal.
3. the device of the dry gas seals fluting according to claim 1 based on the design of bottom land micro forming, it is characterised in that：Institute
State rotating ring（12）With axle sleeve（6）Between be provided with rotating ring O-ring.
4. the device of the dry gas seals fluting according to claim 1 based on the design of bottom land micro forming, it is characterised in that：Institute
State stationary seat（3）With stationary ring（9）It is directly provided with stationary ring O-ring（10）.
5. the device of the dry gas seals fluting according to claim 1 based on the design of bottom land micro forming, it is characterised in that：Institute
State axle sleeve（6）It is provided with holding screw.
6. the device of the dry gas seals fluting according to claim 1 based on the design of bottom land micro forming, it is characterised in that：Institute
State axle sleeve（6）With housing（1）Between be seal cavity（13）.
7. the device of the dry gas seals fluting based on the design of bottom land micro forming according to claim 2-4 any one, its
It is characterised by：O-ring seal uses micro forming sealing structure circle.
8. the device of the dry gas seals fluting according to claim 7 based on the design of bottom land micro forming is characterized in that：Institute
Stating micro forming sealing structure circle includes spiral flute type, T-slot type and arc-shaped grooves.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720677184.4U CN206802309U (en) | 2017-06-12 | 2017-06-12 | The device of dry gas seals fluting based on the design of bottom land micro forming |
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| CN201720677184.4U CN206802309U (en) | 2017-06-12 | 2017-06-12 | The device of dry gas seals fluting based on the design of bottom land micro forming |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021200938A1 (en) * | 2020-03-31 | 2021-10-07 | イーグル工業株式会社 | Sliding component |
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2017
- 2017-06-12 CN CN201720677184.4U patent/CN206802309U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021200938A1 (en) * | 2020-03-31 | 2021-10-07 | イーグル工業株式会社 | Sliding component |
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