CN104913066A - Mechanical sealing structure of gas lubricating end face with human pyramid-like combined groove deep grooves - Google Patents
Mechanical sealing structure of gas lubricating end face with human pyramid-like combined groove deep grooves Download PDFInfo
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- CN104913066A CN104913066A CN201510329342.2A CN201510329342A CN104913066A CN 104913066 A CN104913066 A CN 104913066A CN 201510329342 A CN201510329342 A CN 201510329342A CN 104913066 A CN104913066 A CN 104913066A
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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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
- F16J15/3408—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface
- F16J15/3412—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface with cavities
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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
- F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
-
- 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
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
Abstract
A mechanical sealing structure of a gas lubricating end face with human pyramid-like combined groove deep grooves comprises a moving ring and a static ring which are in mechanical seal. The end face of at least one seal ring between the moving ring and the static ring is provided with a plurality of human pyramid-like combined groove deep grooves spirally evenly distributed in the circumferential direction, and the human pyramid-like combined groove deep grooves are gradually narrowed from the upstream part to the downstream part. The human pyramid-like combined groove deep grooves are composed of basic dynamic pressure grooves and human pyramid-like grooves. The bottom surfaces of the basic dynamic pressure grooves are provided with the human pyramid-like grooves, and the depths of the human pyramid-like grooves become shallow gradually from the upstream part to the downstream part. The human pyramid-like grooves are formed by splicing multiple rows of sub-grooves, the adjacent sub-grooves on the same row are separated through sealing weirs with the depths equal to that of the basic dynamic pressure grooves, the sub-grooves on one downstream side stride over the sealing weirs between two sub-grooves of adjacent rows on the upstream side and are communicated with the sub-grooves on the two sides of the sealing weirs on the upstream side, and a sealing dam is arranged on the downstream part of the end face.
Description
Technical field
The present invention relates to a kind of Hydrodynamic pressure type gas lubrication end surface mechanical sealing structure of rotary type fluid machine, in particular to a kind of containing basic dynamic pressure groove and the composite slot deep end surface seal structure like human pyramid type groove, be applicable to the air film end face seal of the rotating machinery axle heads such as various compressor, blower fan, pump and reactor.
Background technique
Dry gas seals, since the exploitation sixties in last century, has been used widely on the high speed such as centrifugal compressor, blower fan rotating machinery with the performance advantage of its uniqueness.Dry gas seals is helix by offering molded line on seal face, the dynamic pressure groove of straight line or circular arc line, when rotating ring rotates, gas medium is pumped into seal face by the active and static pressure effect utilizing dynamic pressure groove stronger, the gas entering seal face is obstructed at groove root place boosting, produce certain fluid using dynamic and static pressures to push end face open, thus non-contact runs under making dry gas seals can maintain the condition of one deck micron order air film, but it is high that existing dry gas seals still also exists leak-down rate in the using process of high speed rotating machinery, gas film stiffness is large not, the problems such as anti-high speed disturbance ability, failure accidents happens occasionally.
For reducing the leak-down rate of dry gas seals under high-speed condition, improve sealing, a kind of screw groove end face sealing (US 6152452) of U. S. Patent proposes a kind of like splay helical groove structure, it is provided with following current pumping groove gas medium being pumped into seal face at seal face upstream side, and be provided with the adverse current pumping groove of anti-for gas leakage blowback upstream side in end face downstream side, between same group of following current pumping groove and adverse current pumping groove radial direction, be provided with the circumferential seal dam of not slotting.Although this structure can reduce the leakage of sealing medium to internal side diameter effectively, its gas film stiffness has decline to a certain degree, is unfavorable for the stable of air film under high-speed condition.
For the gas film stiffness of Spiral Groove Dry Gas Seals by Use under raising high-speed condition, improve operation stability, Chinese patent double spiral groove three-dimensional spiral groove face seals (CN2594554Y), gas end surface sealing structure with three-dimensional feather-like textured bottom shaped grooves (CN101644333A) and U. S. Patent non-contacting mechanical face seal (US5441283A) etc., open source literature is if the performance study of bionical leafy aerofoil profile groove dry gas face seals is (see " tribology journal ", 33rd volume the 4th phase: pp372-381 in 2013), above-mentioned end face seal has certain performance advantage compared to common one-way spiral groove dry gas seals on Blanking cavity design under high-speed condition, but leak-down rate is higher when still there is high speed operation, comprehensive sealing performance is not good waits deficiency.
Summary of the invention
The present invention will overcome dry gas seals leak-down rate high, the gas film stiffness not large problem existing when high speed and high pressure condition is run, there is provided a kind of strong at high speed and high pressure condition lower end surface hydrodynamic, gas film stiffness is large, the seemingly human pyramid compound groove depth gas end surface mechanical sealing structure that leak-down rate is low.
Technological scheme of the present invention is:
Like human pyramid compound groove depth type groove gas lubrication end surface mechanical sealing structure, comprise rotating ring and the stationary ring of mechanical seal, the side of described rotating ring or stationary ring end face is high pressure side and upstream, the opposite side of described rotating ring or stationary ring end face is low voltage side and downstream, it is characterized by: in described rotating ring and stationary ring at least one seal ring end face on offer multiple along the circumferential direction equally distributed in the shape of a spiral like human pyramid compound groove depth type groove, described be from upstream to downstream like human pyramid compound groove depth type groove and narrow gradually; Described seemingly human pyramid compound groove depth type groove forms by basic dynamic pressure type groove with like human pyramid type groove, described basic dynamic pressure groove is opened in end face upstream, the groove bottom of described basic dynamic pressure groove is provided with like human pyramid type groove, and the degree of depth like human pyramid type groove shoals from upstream gradually to downstream; Described seemingly human pyramid type groove is spliced by arranging pilot trench more, is cut off between the adjacent pilot trench of same row by the sealing weir that the degree of depth is equal with basic dynamic pressure type groove depth; On sealing weir between two pilot trench that the pilot trench of side, downstream straddles the adjacent row in side, upstream;
The described end face downstream like human pyramid compound groove depth type groove is provided with sealing dam.
Further, the pilot trench of side, downstream is through with the pilot trench of the both sides on the sealing weir of the side, upstream straddled.
Or, separated by the fan-shaped sealing weir with basic dynamic pressure groove deep equality between the pilot trench of side, downstream and the pilot trench of the both sides on the sealing weir of side, upstream straddled.
Further, the width of the pilot trench of side, downstream is less than the pilot trench of the adjacent row of side, upstream.
Preferably, described seemingly human pyramid type groove is spliced by 3 row's pilot trench, and being wherein positioned at the pilot trench arranged upstream one has 3, and the pilot trench that downstream one is arranged has 1, and the middle pilot trench arranged has 2.
Further, described basic dynamic pressure groove is at groove root radius r
gthe circular arc angle theta at place
giwith at external diameter r
othe circular arc angle theta at place
goratio θ
gi/ θ
go=0 ~ 1; Described basic dynamic pressure groove is at external diameter r
othe circular arc angle theta at place
gthe circular arc angle theta of weir in same radius is sealed with corresponding
lratio θ
g/ θ
lchoosing value scope be θ
g/ θ
l=0.5 ~ 8; The degree of depth h of described basic dynamic pressure groove
0choosing value scope is 0 ~ 10 μm, the described degree of depth h like human pyramid type groove
ichoosing value scope is 1 ~ 30 μm.
Preferably, θ
gi/ θ
go=0.3 ~ 0.6, θ
g/ θ
l=1.5 ~ 4; The degree of depth h of described basic dynamic pressure groove
0preferred value scope is 0.5 ~ 5 μm, the described degree of depth h like human pyramid type groove
ifigure of merit scope is selected to be 2 ~ 18 μm.
The working principle of invention is: when running like human pyramid compound groove depth type groove dry gas seals, process the more shallow basic dynamic pressure groove of the seal face upstream side degree of depth can by flowing medium by outside diameter to internal side diameter pumping, gas forms zone of high pressure near basic dynamic pressure groove groove root, and the convergence structure that basic dynamic pressure groove is narrowed gradually by upstream to downstream canal contribute to flowing medium in the type groove of upstream compression supercharging.Basis dynamic pressure groove lower floor is processed with from upstream to the seemingly human pyramid type groove that the downstream degree of depth shoals gradually, and the groove width of each pilot trench also narrows from upstream gradually to downstream, and so formation is typically three-dimensional restrains grooved, the compression of raising fluid medium further.Be positioned between each pilot trench with row and separated by the sealing weir of the degree of depth and basic dynamic pressure groove deep equality, pumped into by outer radial center the pilot trench that fluid can be separated from multiple circumference, this multiple-grooved flow guiding structure convection cell has stronger guide functions; The described upstream pilot trench like human pyramid type groove is connected through with contiguous downstream pilot trench one_to_one corresponding, same foundation dynamic pressure groove middle and lower reaches are few with row's pilot trench number row same compared with contiguous upstream pilot trench, furthermore downstream is less than contiguous upstream with arranging pilot trench with the degree of depth of row's pilot trench, cause the flowing medium be pumped to from upstream respectively to be arranged in downstream thus and constantly converge extruding like human pyramid type groove, form stronger dynamic pressure effect.At the root of the side channel windward place of each row's pilot trench and basic dynamic pressure groove, fluid constricted flow, pressure medium raises, thus form the pressure peak significantly radially distributed, from end face upstream to downstream side, each pressure peak raises step by step, and each pressure peak is mutually interfered superposition and forms more large-area zone of high pressure.
Advantage of the present invention and beneficial effect:
(1) this structure forms by basic dynamic pressure groove with like human pyramid type groove, the groove width of basis dynamic pressure groove narrows from upstream gradually to downstream, and processing shoaling gradually from upstream to downstream like its groove depth of human pyramid groove on basic dynamic pressure groove bottom surface, each row is also narrowed to downstream by upstream gradually like the groove width of human pyramid type groove, the exemplary three-dimensional convergence type groove fluid medium formed has stronger compression and pump draws effect, larger end face bearing capacity and fluid film rigidity can be obtained under identical fluid film thickness condition, improve sealing high speed operation stability.
(2) separated by the sealing weir of the degree of depth and basic dynamic pressure groove deep equality between each pilot trench like the same row of human pyramid type groove, the multiple-grooved flow guiding structure fluid medium formed has stronger guide functions, flowing medium can be made more uniformly to enter seal face, weaken seal ring eddy current effect in the type groove of high speed and high pressure operational condition lower end surface, thus improve the operation stability of sealing.
(3) multiple pressure peaks radially distributed with circumference that flowing medium is being formed like each pilot trench of same row of human pyramid type groove and the root of the side channel windward place of basic dynamic pressure groove superpose mutually, compared with the single zone of high pressure formed in the groove root place near end face internal side diameter with the Hydrodynamic pressure type groove such as normal spiral groove, U-type groove, V-type groove, arc groove or straight-line groove, thus form more large-area zone of high pressure, be conducive to the bearing capacity and the gas film stiffness that improve sealing, improve start and stop characteristic and the high speed operation stability of sealing; In addition, the distance like the multiple zone of high pressure and internal side diameter that are positioned at end face upstream side in human pyramid type groove is comparatively large, and choked flow effect strengthens, and significantly can reduce the leakage of flowing medium to internal side diameter, thus improve the sealing of such gas film sealing to a greater degree.
(4) by appropriate design basis dynamic pressure groove and the physical dimension like human pyramid type groove, can superpose with the interference like human pyramid Xing Caozhong fluid high-pressure district in fluid high-pressure district in optimized integration dynamic pressure groove, make the pressure distribution of seal face more even, and middle pressure peak value is higher, produce larger bearing capacity and gas film stiffness.
Accompanying drawing illustrates:
Fig. 1 is the fluting end view of the invention process case one;
Fig. 2 is the fluting end face geometrical structure parameter unified definition schematic diagram of the invention process case one;
Fig. 3 is the tomograph of the invention process case one;
Fig. 4 is the working principle schematic diagram of the invention process case one;
Fig. 5 is the fluting end view of the invention process case two;
Fig. 6 is the tomograph of the invention process case two;
Fig. 7 is the fluting end view of the invention process case three;
Fig. 8 is the tomograph of the invention process case three;
Fig. 9 is the fluting end view of the invention process case four;
Figure 10 is the tomograph of the invention process case four.
Embodiment
By reference to the accompanying drawings enforcement of the present invention is described in further detail.
Embodiment one
See Fig. 1, Fig. 2 and Fig. 3, a kind of like human pyramid compound groove depth type groove gas lubrication end surface mechanical sealing structure, comprise rotating ring and the stationary ring of mechanical seal, the side of described rotating ring or stationary ring end face is high pressure side and upstream, the opposite side of described rotating ring or stationary ring end face is low voltage side and downstream, it is characterized by: in described rotating ring and stationary ring at least one seal ring end face on offer multiple along the circumferential direction equally distributed like human pyramid compound groove depth type groove, described seemingly human pyramid compound groove depth type groove forms by basic dynamic pressure type groove 4 with like human pyramid type groove 1, described basic dynamic pressure groove 4 is opened in end face upstream, the groove bottom of described basic dynamic pressure groove 4 is processed with like human pyramid type groove 1, the described upstream pilot trench 11 like adjacent two row's type grooves in human pyramid type groove 1, 13 to compare the width of contiguous downstream pilot trench with 15 larger, with row's pilot trench 11 and 13, 13 and 15 and between 21 and 23 respectively by the sealing weir 12 of the degree of depth and the deep equality of basic dynamic pressure type groove 4, 14 and 22 cut off, the described end face downstream like human pyramid compound groove depth type groove is provided with the annulus smooth surface of not slotting and namely seals dam 6.
Described like in human pyramid type groove, the pilot trench of side, downstream is through with the pilot trench of the both sides on the sealing weir of the side, upstream straddled.Adjacent two arrange pilot trench 11,13 and 21,13,15 and 23,21, between 23 and 3, correspondence is through.
Described basic dynamic pressure groove 4 is at groove root radius r
gthe circular arc angle theta at place
giwith at external diameter r
othe circular arc angle theta at place
goratio θ
gi/ θ
gochoosing value scope be θ
gi/ θ
go=0 ~ 1, preferred value scope is θ
gi/ θ
go=0.3 ~ 0.6.
Described basic dynamic pressure groove 4 is at external diameter r
othe circular arc angle theta at place
gthe circular arc angle theta of weir 5 in same radius is sealed with corresponding
gratio θ
g/ θ
lchoosing value scope be θ
g/ θ
l=0.5 ~ 8, preferred value scope is θ
g/ θ
l=1.5 ~ 4.
The degree of depth h of described basic dynamic pressure groove 4
0choosing value scope is 0 ~ 20 μm, and preferred value scope is 0.5 ~ 5 μm, the described degree of depth h like human pyramid type groove 1
ichoosing value scope is 1 ~ 100 μm, selects figure of merit scope to be 2 ~ 20 μm.Described each row's pilot trench degree of depth shoals from end face upstream gradually to downstream, is also the groove depth h of upstream row pilot trench 11,13,15
3, the groove depth h of middle row's pilot trench 21 and 23
2, the groove depth h of downstream row pilot trench 3
1meet: h
1< h
2< h
3.
With reference to Fig. 1 and Fig. 4, the process that flowing medium is dynamic from outside diameter to internal diameter effluent, at the root of side channel windward 110,130 and 150 place of upstream row pilot trench 11,13 and 15, the root of side channel windward 210 and 230 place of middle row's pilot trench 21 and 23, the root of side channel windward 30 of downstream row pilot trench 3 and the root 40 of the side channel windward place of basic dynamic pressure groove 4 form multiple pressure peak radially distributed with circumference, the pressure of seal face is divided into more even, and each pressure peak is mutually interfered superposition and forms more large-area zone of high pressure, contributes to improving air film supported power and gas film stiffness.
Embodiment two
With reference to Fig. 5 and Fig. 6, the difference of the present embodiment and embodiment one is, described like in human pyramid type groove, separated by the fan-shaped sealing weir with basic dynamic pressure groove deep equality between the pilot trench of side, downstream and the pilot trench of the both sides on the sealing weir of side, upstream straddled.
Separated by the sealing dam 42 with the deep equality of basic dynamic pressure groove 4 between each pilot trench of upstream row 11,13,15 and each pilot trench of contiguous downstream row 21,23, separated by the sealing dam 41 with the deep equality of basic dynamic pressure groove 4 between each pilot trench 21,23 of row and contiguous downstream row pilot trench 3 in the middle of described, all the other structures are identical with embodiment one with mode of execution.
Embodiment three
With reference to Fig. 7 and Fig. 8, the difference of the present embodiment and embodiment one is, in the middle of described, each pilot trench 21 and 23 of row is embedded in contiguous upstream row pilot trench 11 and 13 and between 13 and 15 respectively, and described downstream row pilot trench 3 is embedded between middle row's pilot trench 21 and 23, all the other structures are identical with embodiment one with mode of execution.
Embodiment four
With reference to Fig. 9 and Figure 10, the difference of the present embodiment and embodiment one is, the sidewall molded line of described basic dynamic pressure groove 4 is radial alignment, described is straight line like the sidewall molded line of each arhat groove in human pyramid type groove 1, described basic dynamic pressure groove 4 and seemingly human pyramid type groove 1 are the two-way chutes about radius symmetry, this kind is applicable to bidirectional rotation fluid machinery occasion like human pyramid compound groove depth type groove gas lubrication end surface mechanical sealing, and all the other structures are identical with embodiment three with mode of execution.
Content described in this specification embodiment is only enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as being only limitted to the concrete form that embodiment states, protection scope of the present invention also and in those skilled in the art conceives thinkable equivalent technologies means according to the present invention.
Claims (6)
1. like human pyramid compound groove depth type groove gas lubrication end surface mechanical sealing structure, comprise rotating ring and the stationary ring of mechanical seal, the side of described rotating ring or stationary ring end face is high pressure side and upstream, the opposite side of described rotating ring or stationary ring end face is low voltage side and downstream, it is characterized by: in described rotating ring and stationary ring at least one seal ring end face on offer multiple along the circumferential direction equally distributed in the shape of a spiral like human pyramid compound groove depth type groove, described be from upstream to downstream like human pyramid compound groove depth type groove and narrow gradually; Described seemingly human pyramid compound groove depth type groove forms by basic dynamic pressure type groove with like human pyramid type groove, described basic dynamic pressure groove is opened in end face upstream, the groove bottom of described basic dynamic pressure groove is provided with like human pyramid type groove, and the degree of depth like human pyramid type groove shoals from upstream gradually to downstream; Described seemingly human pyramid type groove is spliced by arranging pilot trench more, is cut off between the adjacent pilot trench of same row by the sealing weir that the degree of depth is equal with basic dynamic pressure type groove depth; On sealing weir between two pilot trench that the pilot trench of side, downstream straddles the adjacent row in side, upstream; The described end face downstream like human pyramid compound groove depth type groove is provided with sealing dam.
2. sealing configuration according to claim 1, is characterized in that: the pilot trench of side, downstream is through with the pilot trench of the both sides on the sealing weir of the side, upstream straddled.
3. sealing configuration according to claim 1, is characterized in that: separated by the fan-shaped sealing weir with basic dynamic pressure groove deep equality between the pilot trench of side, downstream and the pilot trench of the both sides on the sealing weir of side, upstream straddled.
4. sealing configuration as claimed in claim 2 or claim 3, is characterized in that: described seemingly human pyramid type groove is spliced by 3 row's pilot trench, and being wherein positioned at the pilot trench arranged upstream one has 3, and the pilot trench that downstream one is arranged has 1, and the pilot trench that centre is arranged has 2.
5. sealing configuration according to claim 4, is characterized in that: the width of the pilot trench of side, downstream is less than the pilot trench of the adjacent row of side, upstream.
6. sealing configuration according to claim 5, is characterized in that: described basic dynamic pressure groove is at groove root radius r
gthe circular arc angle theta at place
giwith at external diameter r
othe circular arc angle theta at place
goratio θ
gi/ θ
go=0 ~ 1; Described basic dynamic pressure groove is at external diameter r
othe circular arc angle theta at place
gthe circular arc angle theta of weir in same radius is sealed with corresponding
lratio θ
g/ θ
lchoosing value scope be θ
g/ θ
l=0.5 ~ 8; The degree of depth h of described basic dynamic pressure groove
0choosing value scope is 0 ~ 10 μm, the described degree of depth h like human pyramid type groove
ichoosing value scope is 1 ~ 30 μm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510329342.2A CN104913066B (en) | 2015-06-15 | 2015-06-15 | Like the compound groove depth type groove gas lubrication end surface mechanical sealing structure of pyramid |
| CN201811187170.XA CN109237039B (en) | 2015-06-15 | 2015-06-15 | Mechanical sealing structure for gas lubrication end face of deep groove of quasi-laminated arhat composite groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510329342.2A CN104913066B (en) | 2015-06-15 | 2015-06-15 | Like the compound groove depth type groove gas lubrication end surface mechanical sealing structure of pyramid |
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|---|---|---|---|
| CN201811187170.XA Division CN109237039B (en) | 2015-06-15 | 2015-06-15 | Mechanical sealing structure for gas lubrication end face of deep groove of quasi-laminated arhat composite groove |
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| CN104913066A true CN104913066A (en) | 2015-09-16 |
| CN104913066B CN104913066B (en) | 2019-02-01 |
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| CN201510329342.2A Active CN104913066B (en) | 2015-06-15 | 2015-06-15 | Like the compound groove depth type groove gas lubrication end surface mechanical sealing structure of pyramid |
| CN201811187170.XA Active CN109237039B (en) | 2015-06-15 | 2015-06-15 | Mechanical sealing structure for gas lubrication end face of deep groove of quasi-laminated arhat composite groove |
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| CN201811187170.XA Active CN109237039B (en) | 2015-06-15 | 2015-06-15 | Mechanical sealing structure for gas lubrication end face of deep groove of quasi-laminated arhat composite groove |
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Cited By (8)
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| CN107314112A (en) * | 2017-07-24 | 2017-11-03 | 浙江工业大学 | A kind of mechanical seal end surface structure of sharpening disk texture |
| CN107327577A (en) * | 2017-08-31 | 2017-11-07 | 江苏益通流体科技有限公司 | Dynamic pressure pumping formula non-contacting mechanical seal |
| CN108825788A (en) * | 2018-07-19 | 2018-11-16 | 天津科技大学 | Mechanical sealing end face structure |
| CN108999980A (en) * | 2017-06-06 | 2018-12-14 | 祥景精机股份有限公司 | Shaft seal device |
| CN109826960A (en) * | 2019-03-05 | 2019-05-31 | 浙江工业大学 | A kind of axial multilayer runner superposition reflux pumping mechanical seal structure |
| CN109838562A (en) * | 2019-03-05 | 2019-06-04 | 浙江工业大学 | A kind of axial multilayer runner superposition reinforcing pumping machine sealing structure |
| CN111981126A (en) * | 2019-05-23 | 2020-11-24 | 浙江大学宁波理工学院 | Compound sealed end surface structure of three fens of collection micropores and ladder spiral groove |
| CN116733975A (en) * | 2023-08-14 | 2023-09-12 | 东营海森密封技术有限责任公司 | Dynamic and static pressure combined type air film sealing device |
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| CN109237039A (en) | 2019-01-18 |
| CN109237039B (en) | 2019-12-24 |
| CN104913066B (en) | 2019-02-01 |
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