CN102927282A - Mechanical sealing device provided with depth-keeping ratio step groove end face sealing rings - Google Patents
Mechanical sealing device provided with depth-keeping ratio step groove end face sealing rings Download PDFInfo
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- CN102927282A CN102927282A CN2012104493117A CN201210449311A CN102927282A CN 102927282 A CN102927282 A CN 102927282A CN 2012104493117 A CN2012104493117 A CN 2012104493117A CN 201210449311 A CN201210449311 A CN 201210449311A CN 102927282 A CN102927282 A CN 102927282A
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Abstract
A mechanical sealing device provided with depth-keeping ratio step groove end face sealing rings comprises a rotary ring and a stationary ring, wherein the rotary ring is capable of rotating along with a rotation shift, the stationary ring is fixed on a stationary ring seat, end faces in opposite axial directions of the rotary ring and the stationary ring are sealing end faces, evenly distributed shallow grooves are arranged in the sealing end faces of at least one side, and the shallow grooves are divided by isolation parts with the end plane height and in the same form. The groove bottom of each shallow groove is composed of at least two steps which deepen successively, the height distance from each step to an adjacent former step and the depth distance from the step surface to the sealing end face meet a relation that (ti+ C0) / (hi) = m, the C0 in the relation is the thickness of a fluid film of the sealing end face when the sealing rings work, the value range of the C0 is 0-0.03 millimeter, the m is a definite ratio coefficient, and the value range of the m is 1.7-2.0. Compared with a flat groove and a groove with the inclined bottom, when working, the mechanical sealing device provided with the depth-keeping ratio step groove end face sealing rings has a more obvious end face fluid dynamic pressure effect, and has stronger bearing capacity and rigidity of the fluid film.
Description
Technical field
The present invention relates to a kind of shaft end seal device of rotating machinery, can be used for the shaft end seal of the rotation class machines such as compressor, decompressor, seperator, pump, reactor of various types.
Background technique
Mechanical seal is widely used in the axial end face seal of numerous rotating machineries.In the currently reported and/or fluid end face non-contact mechanical seal device that uses, generally include one group of rotating ring (being rotating ring) that can rotate with running shaft and be fixed in stationary ring (stationary ring) on the stationary seat that is connected with support, its axial relative end face is seal face.On the one or both sides end face in its two seal face, usually the same form isolated part (weir district) that all offers through having the Transverse plane height is separated into the horizontal bottom form of evenly arranging, or the shallow slot of the different wedged bottom form of bottom surface, the two ends degree of depth, wherein with the end face seal of equivalent gullet depth spiral chute and "T"-shaped groove typical case the most.How to strengthen the dynamic pressure effect of end face fluid, with increase end face fluid film bearing capacity and fluid film rigidity, thereby the lift-off seal operation stability finally increases the service life, and is one of main direction of non-contact mechanical seal research.And the shallow slot grooved of offering on the change seal face often is a kind of effective means that strengthens end face hydrodynamic effect.As: Chinese patent 02146449.9 discloses a kind of Unit for sealing end surface of 3 D helical flute with double helix angles.Its structure is that the spiral fluted upstream is that the high pressure side is wider, the downstream is that low voltage side is narrower, and the spiral fluted degree of depth is that the high pressure side is that low voltage side shoals gradually to the downstream from the upstream, thereby forms a kind of three-dimensional convergent contour spiral chute.This Unit for sealing end surface of 3 D helical flute with double helix angles can obtain larger fluid film rigidity, but processing is very difficult at the bottom of the spiral groove of its inclination.
Chinese patent 02132978.8 discloses a kind of spiral groove end face mechanical sealing by the angular microflute group composition.This angular microflute trend is consistent with the spiral chute direction, and sealing end face shallow slot structure seems and more complicated because this angular microflute moves towards to distribute along spiral chute, and do not have obvious collapsed shape, is difficult to significantly promote end face fluid film rigidity.
Summary of the invention
For above-mentioned situation, the invention provides a kind of new structure grooved seal face ring that has, specifically be a kind ofly to have depthkeeping than the mechanical seal device of stepped slot end face sealing ring, can have more preferably hydrodynamic effect.
The present invention has depthkeeping than the mechanical seal device of stepped slot end face sealing ring, to include at present the rotating ring that can rotate with running shaft and be fixed in stationary ring on the static ring seat, its axial relative end face is seal face, and the same form isolated part that offers through having the Transverse plane height on the side sealing end face at least therein is divided on the shallow slot basis of evenly arranging, the step that the bottom land of each shallow slot is deepened by at least two successives consists of, and each step is adjacent the height distance h between a step
i, with and step surface to the depth distance t of seal face
iShould satisfy relation: (t
i+ C
0)/(h
i)=m.C in the formula
0The fluid film thickness of seal face when working for seal ring, 0 ~ 0.03 millimeter of span can consider various factors according to actual conditions and suitably adjust.For example, for the conventional machinery sealing, seal face is in gapless direct contact condition substantially; Usually be about 0.003 ~ 0.005 millimeter for the Dry Gas Seal gap; And generally be about 0.01 ~ 0.025 millimeter for some its end clearance of liquid film non-contact mechanical seal.M in the relation be the depthkeeping of step than coefficient, span 1.7 ~ 2.0.In the relation more preferably depthkeeping than Coefficient m=1.866.
The concrete structure of said shallow slot in the said structure, for adapting to different concrete or particular job conditioned disjunction needs, equally can according to actual conditions in the usual way currently reported and/or use such as straight-line groove, oblique trunking, spiral chute, arc groove, chevron-notch, T-slot etc. in selection.The shallow slot quantity of offering on the said seal face there is no too much restriction, but calculation and test shows, generally speaking, after the quantity of shallow slot surpasses 25, the further increase of quantity changes not obvious to effect, therefore consider that from dynamic pressure effect and technology capability aspect the shallow slot quantity on the seal face generally can be preferably 10 ~ 18.To the set-up mode of said seal face shallow slot middle slot base frame stage structure, can adopt the radial outside end that makes in the shallow slot step surface that has a maximum depth distance with seal face be positioned at groove, also can be positioned at the radially inner side end of groove; The shallow slot of offering on the seal face, can be the non-through slot of its radially inner side end by the blocking-up structure institute block with Transverse plane height, or for its radial outside end by the non-through slot of the blocking-up structure institute block with Transverse plane height, also can for connect its place seal face radially in the through slot etc. at two ends, the outside.
The above-mentioned seal arrangement that the stepped slot seal face is set of the present invention, the darkest step that has the maximum depth distance in the practical application with seal face, can be positioned at as required high pressure upstream side or downstream side, the former can increase the load-carrying properties of end face fluid film, use comparatively extensive, latter can reduce end face fluid leakage amount, uses in the place of need pumping.
Further, above-mentioned difference arranges in the shallow slot of form, preferably makes in said each shallow slot to have same depth apart from the radial outside edge of step surface with seal face, is in apart from the seal face axis of rotation to have on the circumference of same radius.
The seal face structure of the above-mentioned stepped slot form structure of the present invention with respect to the flat of present employing and wedged bottom flute profile formula, can have more superior hydrodynamic effect.For example: to C
0=3 microns, groove depth is 11 microns, radially flute length is 14 millimeters, the seal face that dam length is 2 millimeters, adopt respectively and only establish a step, establish two even depth steps that are evenly distributed and in three kinds of situations of two steps of the above-mentioned depth assignment ratio of the present invention, its fluid film bearing capacity is carried out computational analysis to be shown, the bearing capacity of its fluid film is respectively 520.5N, 682.1N and 767.6N, being fluid film bearing capacity of the present invention has promoted 47.5% when only establishing a step, be evenly distributed two even depth steps the time promoted 12.5%.
In the above-mentioned mechanical seal device of the present invention, said stepped slot with depthkeeping ratio, can be arranged on separately on rotating ring (rotating ring) seal face wherein, or be arranged on separately wherein on stationary ring (stationary ring) seal face, also can be arranged on simultaneously on the relative both sides sealing end face of rotating ring and stationary ring.
Being appreciated that the present invention is above-mentioned has in the mechanical seal device of depthkeeping than stepped slot end face sealing ring, and each adjacent step successively decreases by said depthkeeping ratio m apart from the degree of depth of seal face in the step slot type shallow slot of offering in the seal ring end face.With respect to flat-bottom slot and wedged bottom groove, the shallow slot of this Step-edge Junction configuration on the seal face of the present invention, not only have more workability, and the end face fluid film has rigidity and the bearing capacity of larger opening force and Geng Gao when work, have more significant end face hydrodynamic effect.
Below in conjunction with the embodiment by the accompanying drawing illustrated embodiment, foregoing of the present invention is described in further detail again.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following example.Do not breaking away from the above-mentioned technological thought situation of the present invention, various replacements or change according to ordinary skill knowledge and customary means are made all should comprise within the scope of the invention.
Description of drawings
Fig. 1 is a kind of basic status structural representation that stepped slot is positioned at rotating ring (rotating ring) seal face outside diameter in the mechanical seal device of the present invention.
Fig. 2 is the structural representation of rotating ring seal face among Fig. 1.
Fig. 3 is the local structure for amplifying schematic representation of a stepped slot among Fig. 2.
Fig. 4 is to the structural representation that launches along stepped slot edge stepped ramp type wire diameter among Fig. 3.
Embodiment
Shown in Fig. 1-4 is that the present invention has depthkeeping than a kind of structure of the mechanical seal device of stepped slot end face sealing ring, and shown in the figure is a kind of form that stepped slot is positioned at rotating ring seal face outside diameter.This mechanical seal device is by formations such as quiet (ending) ring 1, rotating ring (rotating ring) 2, stationary seat 3, axle sleeve 4, driving pin 5, tolerance ring 6, clamping sleeve 7, throw-out collar 8, spring 9, stop pins 10.Stationary ring 1 and rotating ring 2 coaxial lines arrange face-to-face, and its relative end face forms sealing surface.Stationary ring 1 radially empty set on stationary seat 3, axially by throw-out collar 8 and spring 9 float supports, circumferentially by stop pin 10 location, so stationary ring 1 free floating vertically only.Rotating ring 2 radially by tolerance ring 6 swellings on the external cylindrical surface of axle sleeve 4, axially contact also compacted cover 7 axial compression with the step surface of axle sleeve 4, circumferentially be fixed together by driving pin 5 and axle sleeve 4, so rotating ring 2 can be with axle sleeve 4 and running shaft 15 synchronous rotaries.
(also can be stationary ring at Fig. 2 and rotating ring seal face shown in Figure 3, or simultaneously at the seal face of rotating ring and stationary ring) on, offer through having 12(weir, the same form isolation part district of Transverse plane height) be separated into 10 ~ 18 of quantity, generally be no more than 25 shallow slots of evenly arranging 11.The step 13 that the bottom land of each shallow slot 11 is deepened by at least two successives consists of (being three grades of steps shown in the figure), has same depth apart from t with seal face
iThe radial outside edge 16 of step surface is in apart from the seal face axis of rotation and has on the circumference of same radius.As shown in Figure 4, the height distance h between the upper step that is adjacent of steps at different levels
i, and its step surface is to the depth distance t of seal face
i, should satisfy relation: (t
i+ C
0)/(h
i)=m.C in the formula
0The fluid film thickness of seal face when working for seal ring, 0 ~ 0.03 millimeter of span can be selected according to concrete seal request; M is for to decide ratio coefficient, and span 1.7 ~ 2.0 is preferably m=1.866.At this moment, the h in the said relation in the most shallow one-level step in the stepped slot
i, with its bottom surface to seal face apart from t
iBe actually equal.
Has maximum depth apart from t with seal face in the shallow slot shown in the figure 11
1Step surface, employing be the radial outside end that is positioned at groove, and its radially inner side end is by the blocking-up structure 14(Ba Qu with Transverse plane height) form of the non-through slot of institute's block.Because the shallow slot 11 of step grooved is arranged on the outside diameter of seal ring end face, the degree of depth t of outside diameter step
1The darkest, all the other each steps radially ecto-entad successively decrease step by step.This structure is the sealing of upstream side applicable to the outside diameter of seal face.Fluid enters stepped slot by the darkest one-level step of outside diameter, to more shallow step-flow, under the effect of isolation part 12 between step and each adjacent slot, pressure raises gradually step by step, when fluid arrived blocking-up structure 14 intersection of radially inner side, hydrodynamic pressure can reach maximum.The structure of this kind form is used the most extensive, applicable to the sealing of various compressors, pump, blower fan etc.
Except above-mentioned form, as required, this stepped slot also can be opened in the internal side diameter of seal face, and namely its radial outside end is by the non-through slot of the blocking-up structure institute block with Transverse plane height, and makes with seal face and have maximum depth apart from t
1Step surface be positioned at the radially inner side end of groove, namely the degree of depth on each level rank is shoaled to outside diameter step by step by internal side diameter.This structure is in the pumping type sealing of upstream side applicable to the internal side diameter of seal face generally, particularly leakage rate is had some pumps, the compressor of specific (special) requirements.
In addition, under special circumstances, above-mentioned stepped slot also can be adopted as the form of the through slot that connects two ends, the radially interior outside of its place seal face.
The above embodiments have only related to the single-stage sealing configuration.In actual use, the total arrangement of sealing can have multiple pattern as required, such as labyrinth (more than the two-stage) in the middle of mechanical single seal, double seals, tandem seal (more than the two-stage), the series connection band, also can follow other seal style such as floating-ring seal, carbon ring seal, labyrinth seal to form combined labyrinth and carbon gland, all can adopt the structural design of the above-mentioned step grooved of the present invention in its seal arrangement.
Claims (8)
1. has depthkeeping than the mechanical seal device of stepped slot end face sealing ring, comprise the rotating ring (2) that can rotate with running shaft (15) and be fixed in stationary ring (1) on the static ring seat (3), its axial relative end face is seal face, at least therein the same form isolation part (12) that offers on the side sealing end face through having the Transverse plane height is separated into the shallow slot (11) of evenly arranging, it is characterized in that the bottom land of each shallow slot (11) by step (13) formation of at least two successives intensifications, each step is adjacent the height distance (h between a step
i) and its step surface to the depth distance (t of seal face
i) should satisfy relation: (t
i+ C
0)/(h
i)=m, the C in the formula
0The fluid film thickness of seal face when working for seal ring, 0 ~ 0.03 millimeter of span, m is for deciding ratio coefficient, span 1.7 ~ 2.0.
2. mechanical seal device as claimed in claim 1 is characterized in that the m=1.866 in the said relation.
3. mechanical seal device as claimed in claim 1 is characterized in that having maximum depth distance (t with seal face in the said shallow slot (1)
i) step surface be positioned at the radial outside end of groove.
4. mechanical seal device as claimed in claim 1 is characterized in that having maximum depth distance (t with seal face in the said shallow slot (1)
i) step surface be positioned at the radially inner side end of groove.
5. mechanical seal device as claimed in claim 1 is characterized in that said shallow slot (1) is the non-through slot of its radially inner side end by the blocking-up structure institute block with Transverse plane height.
6. mechanical seal device as claimed in claim 1 is characterized in that said shallow slot (1) is the non-through slot of its radial outside end by the blocking-up structure institute block with Transverse plane height.
7. mechanical seal device as claimed in claim 1 is characterized in that said shallow slot (1) is for connecting the through slot at two ends, the radially interior outside of its place seal face.
8. such as the described mechanical seal device of one of claim 1 to 7, it is characterized in that having same depth distance (t with seal face in said each shallow slot (1)
i) the radial outside edge (16) of step surface, be in apart from the seal face axis of rotation and have on the circumference of same radius.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104493117A CN102927282A (en) | 2012-11-12 | 2012-11-12 | Mechanical sealing device provided with depth-keeping ratio step groove end face sealing rings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104493117A CN102927282A (en) | 2012-11-12 | 2012-11-12 | Mechanical sealing device provided with depth-keeping ratio step groove end face sealing rings |
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| CN102927282A true CN102927282A (en) | 2013-02-13 |
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ID=47642155
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104493117A Pending CN102927282A (en) | 2012-11-12 | 2012-11-12 | Mechanical sealing device provided with depth-keeping ratio step groove end face sealing rings |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982662A (en) * | 2014-06-11 | 2014-08-13 | 湘潭电机股份有限公司 | Rotary sealing device |
| CN104235371A (en) * | 2014-09-03 | 2014-12-24 | 浙江工业大学 | Mechanical sealing structure for end face of lightning groove |
| CN104930193A (en) * | 2015-06-04 | 2015-09-23 | 霍凤伟 | Sealing ring |
| CN104989821A (en) * | 2015-06-04 | 2015-10-21 | 霍凤伟 | Mechanical seal with shallow slots |
| CN105114626A (en) * | 2015-07-24 | 2015-12-02 | 西华大学 | Mechanical seal device for end face seal ring with controllable bellows seal |
| CN106089794A (en) * | 2016-07-07 | 2016-11-09 | 合肥通用环境控制技术有限责任公司 | A kind of ultra-low temperature pump axle head mechanically-sealing apparatus |
| CN106439037A (en) * | 2016-11-18 | 2017-02-22 | 西华大学 | Seal ring and mechanical seal device with combination groove end |
| CN106439023A (en) * | 2016-07-28 | 2017-02-22 | 浙江工业大学 | Cosine curve mechanical seal end surface structure |
| CN107477185A (en) * | 2017-09-07 | 2017-12-15 | 沈阳鼓风机集团核电泵业有限公司 | A kind of oil lubrication thrust bearing mechanical sealing system and cooling medium pump |
| CN110242751A (en) * | 2019-06-28 | 2019-09-17 | 清华大学 | The multi-level biserial slot seal face structure of rotating machinery |
| CN110594418A (en) * | 2019-10-10 | 2019-12-20 | 大连因联科技有限公司 | Mechanical seal end face structure of Lei-column step shallow groove |
| CN111473115A (en) * | 2020-05-13 | 2020-07-31 | 清华大学 | Mechanical seal end face structure with auxiliary weir area |
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| CN202867843U (en) * | 2012-11-12 | 2013-04-10 | 西华大学 | Mechanical sealing device with depthkeeping ratio step groove end face sealing ring |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982662A (en) * | 2014-06-11 | 2014-08-13 | 湘潭电机股份有限公司 | Rotary sealing device |
| CN104235371A (en) * | 2014-09-03 | 2014-12-24 | 浙江工业大学 | Mechanical sealing structure for end face of lightning groove |
| CN104235371B (en) * | 2014-09-03 | 2016-06-15 | 浙江工业大学 | A kind of lightning class groove end surface mechanical sealing structure |
| CN104930193A (en) * | 2015-06-04 | 2015-09-23 | 霍凤伟 | Sealing ring |
| CN104989821A (en) * | 2015-06-04 | 2015-10-21 | 霍凤伟 | Mechanical seal with shallow slots |
| CN105114626A (en) * | 2015-07-24 | 2015-12-02 | 西华大学 | Mechanical seal device for end face seal ring with controllable bellows seal |
| CN106089794A (en) * | 2016-07-07 | 2016-11-09 | 合肥通用环境控制技术有限责任公司 | A kind of ultra-low temperature pump axle head mechanically-sealing apparatus |
| CN106439023A (en) * | 2016-07-28 | 2017-02-22 | 浙江工业大学 | Cosine curve mechanical seal end surface structure |
| CN106439037A (en) * | 2016-11-18 | 2017-02-22 | 西华大学 | Seal ring and mechanical seal device with combination groove end |
| CN107477185A (en) * | 2017-09-07 | 2017-12-15 | 沈阳鼓风机集团核电泵业有限公司 | A kind of oil lubrication thrust bearing mechanical sealing system and cooling medium pump |
| CN110242751A (en) * | 2019-06-28 | 2019-09-17 | 清华大学 | The multi-level biserial slot seal face structure of rotating machinery |
| CN110242751B (en) * | 2019-06-28 | 2024-07-16 | 清华大学 | Multi-layer double-row groove sealing end face structure of rotary mechanical equipment |
| CN110594418A (en) * | 2019-10-10 | 2019-12-20 | 大连因联科技有限公司 | Mechanical seal end face structure of Lei-column step shallow groove |
| CN111473115A (en) * | 2020-05-13 | 2020-07-31 | 清华大学 | Mechanical seal end face structure with auxiliary weir area |
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Application publication date: 20130213 |