CN107218396B - A kind of end face has the mechanical seal structure of vein shape shape slot - Google Patents
A kind of end face has the mechanical seal structure of vein shape shape slot Download PDFInfo
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- CN107218396B CN107218396B CN201710421524.1A CN201710421524A CN107218396B CN 107218396 B CN107218396 B CN 107218396B CN 201710421524 A CN201710421524 A CN 201710421524A CN 107218396 B CN107218396 B CN 107218396B
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- slot
- mechanical seal
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- circle
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Classifications
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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
-
- 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
Abstract
A kind of end face of the present invention has the mechanical seal structure of vein shape shape slot, its front end face, that is, sealing surface is made of outer ring (1), inner ring (2), sealing weir area (3), seals dam area (4) and vein shape shape slot (5), they are all located at the different location on the front end face i.e. sealing surface of the mechanical seal structure；The vein shape shape slot (5) shares 6~12, and number changes with the size of the mechanical seal structure；The vein shape shape slot (5) is by first slot (51), second slot (52), third branch slot (54), the 4th slot (55) and major trough (53) composition；The present invention effectively improves hydrodynamic effect, and side effect caused by reducing because of mechanical seal end surface unevenness improves the task performance of mechanical seal；The failure it is possible to prevente effectively from touching under the extreme operating condition of small film thickness, small pressure difference is rubbed, realize sealing it is non-contact, improve it is wear-resistant, extend service life, improve the reliability of sealing.
Description
Technical field
The present invention provides a kind of mechanical seal structure of the end face with vein shape shape slot, specifically, being one kind in rotating ring
Or a certain number of vein shape shape slots are opened up on the end face of stationary ring, belong to the rotation axis seal technical field in Fluid Sealing.
Background technique
Mechanical seal is a kind of first to the preload of dynamic and static ring end face seal pair and pressure medium and elasticity by elastic element
The compression of part pressure and the axial end face sealing device for reaching sealing, therefore also known as end face seal.Mechanical seal is widely applied
In in the equipment such as centrifugal pump, centrifuge, reaction kettle and compressor.With the fast development of industrial circle, required in practical application
Mechanical seal adapts to thus propose the performance of mechanical seal in high pressure, high speed, the more extreme working condition such as sudden load
Higher requirement.Stable liquid film, the abrasion of end face, sealing ring can not be formed between traditional contacting mechanical seal end face
Hot tearing etc. is all easy to cause the failure of sealing.And current non-contacting seal mainly carries out reshaping on dynamic and static ring end face
(shallow/deep groove type, shallow trench and texture type), these structures improve mechanical sealing performance on certain depth, but there is also some
Shortcoming: although its friction energy-dissipating for shallow/deep groove type is low, face opening ability is also relatively strong, and leakage rate is greater than identical rule
The common end surface mechanical sealing of lattice.The performance for working at the same time middle chip removal is poor, preferably causes the accumulation of particle；Various texture types are all deposited
Fluid film thickness is insufficient between anti-pressure ability, end face, or all fluid film insufficient rigidities lead to sealing system not to resist external interference
Normal table operation, there is also the problems of chip removal ability difference.Accordingly, a kind of mechanical seal structure end face configuration, Neng Goutong are designed
When generate hydrostatic pressure, hydrodynamic pressure, reduce seal face contact, the failure of sealing can be effectively avoided, simultaneously
Keep lesser end clearance to control leakage rate.
Summary of the invention
(1) purpose
In order to overcome the disadvantages of the above prior art, the present invention provides a kind of mechanical seal of the end face with vein shape shape slot
Structure, it is a kind of resistance to compression and strong antijamming capability, is had under high parameter compared with Small leak amount, shutdown process hydrodynamic effect
Well, the mechanical sealing structure of fluid bearings power abundance when operating normally.Improve mechanical sealing performance.
(2) technical solution
Existing mechanical seal structure (as shown in Figure 1) is cylindrical body: rear end face, cylindrical surface, front end face, general to make
What it is for sealing surface is front end face.
The present invention is a kind of mechanical seal structure of the end face with vein shape shape slot, it is characterised in that: the mechanical seal knot
Front end face, that is, sealing surface of structure is by outer ring (1), inner ring (2), sealing weir area (3), seals dam area (4) and vein shape shape slot (5)
Composition, they are all located at the different location on the front end face i.e. sealing surface of the mechanical seal structure.
The outer ring (1), is the periphery of the mechanical seal structure sealing surface；
The inner ring (2), is the inner headed face of the mechanical seal structure sealing surface；
The sealing weir area (3) is the part between two vein shape shape slots (5)；
The seals dam area (4), be vein shape shape slot (5) end (dotted line position in such as Fig. 2) and inner ring (2) it
Between ring part；
The vein shape shape slot (5), is provided on the sealing surface of the mechanical seal structure, because being shaped like in leaf
Vein, so being called vein shape shape slot；The vein shape shape slot (5) shares 6~12, and number is with the mechanical seal structure
Size and change, each vein shape shape slot (5) is arranged symmetrically with the axis centre of the mechanical seal structure.
The vein shape shape slot (5), as shown in figure 4, be by first slot (51), second slot (52), third branch slot (54),
4th slot (55) and major trough (53) composition；First, second, third and fourth totally four branch slots (51), (52), (54), (55) are all straight
Slot, groove width are equal, are 0.5~1.5mm；The major trough (53) is helicla flute, and helix is log spiral, helicla flute
Inclination angle be 18 °~28 °；Angle between four branch slots (51), (52), (54), (55) and major trough (53) is 20 °~45 °；
Four branch slots (51), (52), (54), the groove width of (55) and major trough (53) the ratio between groove width be 1: 2；Four branch slots (51), (52),
(54), the groove depth of (55) is identical as the groove depth of major trough (53), and groove depth is 2~6 μm.
As shown in figure 5, the end of first, fourth slot (51), (55) and major trough (53) is small arc-shaped, all in same half
On the circle of diameter R1, the center of circle of R1 is the center of circle of the mechanical seal structure；Branch slot (52) end and branch slot (54) end are also roundlet
Arc, this two sections of small arc-shapeds are on the circle with Radius R2, and the center of circle of R2 is the center of circle of the mechanical seal structure；The R2 is round and main
The intersection point of slot (53) is the beginning of branch slot (51) and branch slot (55)；The beginning of branch slot (52) and branch slot (54) is the circle that radius is R3
The center of circle with the intersection point of major trough (53), R3 is the center of circle of the mechanical seal structure；Second and third branch slot (52), (54) beginning
It is the intersection point of circle and major trough (53) that radius is R3, the center of circle of R3 is the center of circle of the mechanical seal structure.
Entire mechanical seal structure (as shown in Figure 3), internal diameter areOuter diameter isThe axial direction of mechanical seal structure
With a thickness of L；Whole blank is formed and then is machined out by casting, and seal face carries out accurate pattern processing.
(3) advantage and effect
The beneficial effects of the present invention are: (1) in the case where being strict with the irreversible service condition of rotary shaft, symmetrical vein shape
Shape slot effectively improves hydrodynamic effect, and side effect caused by reducing because of mechanical seal end surface unevenness improves machine
The task performance of tool sealing；(2) because the major trough opening of shape slot is directed towards higher-pressure region i.e. seal chamber, shape slot entire in this way has
Hydrostatic pressure effect, so that mechanical seal under action of hydrostatic pressure, is opened under stationary state.(3) entity sealing ring is avoided
The problem of leading to deformation or even mechanical seal end surface cracking because uneven heating is even, sealing fluid can be effectively prevented in vein shape shape slot
The accumulation of middle particle, the presence in seals dam area 4 may be implemented axis it is static when static seal.(4) it is possible to prevente effectively from it is small film thickness, small
Touching under the extreme operating condition of pressure difference is rubbed failure, realize sealing it is non-contact, improve wear-resistant, extend service life, improve
The reliability of sealing.
Detailed description of the invention
Fig. 1 is existing machinery sealed structural schematic diagram.
Fig. 2 is the main view of mechanical seal structure of the present invention.
Fig. 3 is the shaft side figure of mechanical seal structure of the present invention.
Fig. 4 is the enlarged view of vein shape shape slot.
Fig. 5 is the geometric dimension figure of vein shape shape slot.
Fig. 6 is the direction of rotation schematic diagram of mechanical seal structure of the present invention.
Serial number, code name explanation in Fig. 1:
Rear end face, cylindrical surface, front end face (sealing surface)
Serial number in Fig. 2, code name explanation:
1 is outer ring, and 2 be inner ring, and 3 be sealing weir area, 4 is seals dam area, 5 is vein shape shape slot.
Serial number in Fig. 3, code name explanation:
For the internal diameter of entire mechanical seal,For entire mechanical seal structure outer diameter, L is that mechanical seal structure is axial
Thickness.
Serial number in Fig. 4, code name explanation:
51 it is branch slot, 52 be branch slot, 53 be major trough, 54 be branch slot, 55 is branch slot.
Serial number in Fig. 5, code name explanation:
R1 is the radius of 53 end circular arc of 51 end of branch slot, 55 end of branch slot and major trough.R2 is 52 end of branch slot and branch slot
The intersection point of the radius of 54 end circular arcs, the circle and major trough 53 is 55 beginning of 51 beginning of branch slot and branch slot.R3 is with the circle of the radius
The intersection point of arc and major trough 53, as 54 beginning of 52 beginning of branch slot and branch slot.Serial number in Fig. 6, code name explanation:
High-pressure side (seal chamber), low-pressure side (sealing leak side), direction of rotation (rotation direction of rotary shaft).
Specific embodiment
The present invention is illustrated with reference to the accompanying drawings and detailed description.
The structure of the embodiment of the present invention is as shown in Fig. 1.Including outer ring (1), inner ring (2), sealing weir area (3), sealing
Ba Qu (4), vein shape shape slot (5).As shown in Fig. 2, being all the difference on the front end face (sealing surface) of mechanical seal structure
Position.Entirely the internal diameter of mechanical seal structure isOuter diameter isThe axial width of mechanical seal structure is L.Mechanical seal
It is provided with 8 vein shape shape slot (5) its numbers on the front end face (sealing surface) of structure to change with the size of mechanical seal structure, respectively
Vein shape shape slot is symmetrical with the axis centre of mechanical seal structure.Vein shape shape slot (5) includes first slot (51), second slot
(52), third branch slot (54), the 4th slot (55) and major trough (53).First, second, third and fourth totally four branch slots (51), (52),
(54), (55) are all straight troughs, and it is 0.6mm that groove width, which is equal,；The major trough (53) is helicla flute, and helix is logarithm spiral shell
Spin line, the inclination angle of helicla flute are 20 °；Angle between four branch slots (51), (52), (54), (55) and major trough (53) is 20 °
~45 °；Four branch slots (51), (52), (54), the groove width of (55) and major trough (53) the ratio between groove width be 1: 2；Four branch slots
(51), (52), (54), the groove depth of (55) are identical as the groove depth of major trough (53), and groove depth is 5 μm.
The end of first, fourth slot (51), (55) and major trough (53) is small arc-shaped, all in the circle of same Radius R1
On, the center of circle of R1 is the center of circle of the mechanical seal structure；Branch slot (52) end and branch slot (54) end are also small arc-shaped, and this two sections
Small arc-shaped is on the circle with Radius R2, and the center of circle of R2 is the center of circle of the mechanical seal structure；R2 circle and major trough (53)
Intersection point is the beginning of branch slot (51) and branch slot (55)；The beginning of branch slot (52) and branch slot (54) is the circle and major trough that radius is R3
(53) center of circle of intersection point, R3 is the center of circle of the mechanical seal structure；Second and third branch slot (52), (54) beginning be radius
For the circle of R3 and the intersection point of major trough (53), the center of circle of R3 is the center of circle of the mechanical seal structure.
A kind of major trough of mechanical seal structure of the end face of the present invention with vein shape shape slot is open towards high-pressure side namely
Seal chamber, so that high pressure side liquid can enter seal face under the action of hydrostatic pressure, will before shaft rotation
Dynamic and static ring separates, to avoid the abrasion of end face seal Ba Qu when rotation.When mechanical seal structure starts rotation, due to branch slot
Presence, form apparent hydrodynamic effect, and due to the symmetry of shape slot, it is constantly tired along direction of rotation Fluid pressure
Product generates enrichment effect；Sealing startup stage can be such that end face faster separates；In shutdown phase it is possible to prevente effectively from the mistake of end face
Degree rubs and causes the failure of sealing；Simultaneously in the presence of dynamic disturbances, the increase of small film thickness lower end surface film bearing capacity can have
Abrasion caused by the contact of end face is avoided to effect, the anti-interference ability of sealing is improved.When sealing normal operation, mechanical seal
Structure is rotated along direction of rotation shown in fig. 6, and four branch slots are to form dynamic pressure effect, especially third branch slot (54), the 4th
Branch slot (55), major trough (53) play discharge because of the particle of abrasion generation and form the effect thrown away outward as liquid.Exist simultaneously
The problems such as tradition machinery will be overcome to seal existing opening force, insufficient rigidity when normal operation, effectively improves sealing operation
Stability.
Claims (5)
1. the mechanical seal structure that a kind of end face has vein shape shape slot, it is characterised in that: the front end face of the mechanical seal structure
I.e. sealing surface is made of outer ring (1), inner ring (2), sealing weir area (3), seals dam area (4) and vein shape shape slot (5), they are all
Different location on front end face, that is, sealing surface of the mechanical seal structure；
The outer ring (1), is the periphery of the mechanical seal structure sealing surface；
The inner ring (2), is the inner headed face of the mechanical seal structure sealing surface；
The sealing weir area (3) is the part between two vein shape shape slots (5)；
The seals dam area (4) is the ring part between the end of vein shape shape slot (5) and inner ring (2)；
The vein shape shape slot (5), is provided on the sealing surface of the mechanical seal structure；The vein shape shape slot (5) shares 6~
12, number changes with the size of the mechanical seal structure；Each vein shape shape slot (5) is with the axis of the mechanical seal structure
Line is centrosymmetrically arranged；
The vein shape shape slot (5) be by first slot (51), second slot (52), third branch slot (54), the 4th slot (55) and
Major trough (53) composition；First slot (51), second slot (52), third branch slot (54) and the 4th slot (55) are all straight trough, slot
Width is equal；The major trough (53) is helicla flute；First slot (51), second slot (52), third branch slot (54) and the 4th
Angle between branch slot (55) and major trough (53) is 20 °~45 °；First slot (51), second slot (52), third branch slot (54)
And the ratio between the groove width of the 4th slot (55) and the groove width of major trough (53) are 1: 2；First slot (51), second slot (52), third
The groove depth of branch slot (54) and the 4th slot (55) is identical as the groove depth of major trough (53)；
The end of first slot (51), the 4th slot (55) and major trough (53) is small arc-shaped, all in the circle of same Radius R1
On, the center of circle of R1 is the center of circle of the mechanical seal structure；Second slot (52) end and third branch slot (54) end are also roundlet
Arc, this two sections of small arc-shapeds are on the circle with Radius R2, and the center of circle of R2 is the center of circle of the mechanical seal structure；The R2 is round and main
The intersection point of slot (53) is the beginning of first slot (51) and the 4th slot (55)；The beginning of second slot (52) and third branch slot (54)
End is the intersection point of the circle that radius is R3 and major trough (53), and the center of circle of R3 is the center of circle of the mechanical seal structure；Second slot
(52) and the beginning of third branch slot (54) be radius be R3 circle and major trough (53) intersection point, the center of circle of R3 is the mechanical seal knot
The center of circle of structure；
Entire mechanical seal structure, internal diameter areOuter diameter isThe axial width of mechanical seal structure is L.
2. the mechanical seal structure that a kind of end face according to claim 1 has vein shape shape slot, it is characterised in that: the machine
Tool sealing structure, whole blank are formed and then are machined out by casting, and seal face carries out accurate pattern processing.
3. the mechanical seal structure that a kind of end face according to claim 1 has vein shape shape slot, it is characterised in that: be spiral shell
The major trough (53) of spin slot, helix are log spiral, and the inclination angle of helicla flute is 18 °~28 °.
4. the mechanical seal structure that a kind of end face according to claim 1 has vein shape shape slot, it is characterised in that: this
One slot (51), second slot (52), third branch slot (54), the 4th slot (55) and major trough (53) groove depth be 2~6 μm.
5. the mechanical seal structure that a kind of end face according to claim 1 has vein shape shape slot, it is characterised in that: this
One slot (51), second slot (52), third branch slot (54), the 4th slot (55) groove width be 0.5~1.5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710421524.1A CN107218396B (en) | 2017-06-07 | 2017-06-07 | A kind of end face has the mechanical seal structure of vein shape shape slot |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710421524.1A CN107218396B (en) | 2017-06-07 | 2017-06-07 | A kind of end face has the mechanical seal structure of vein shape shape slot |
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| CN107218396A CN107218396A (en) | 2017-09-29 |
| CN107218396B true CN107218396B (en) | 2019-01-15 |
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Families Citing this family (6)
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| CN107542934B (en) * | 2017-10-31 | 2019-04-30 | 南昌工程学院 | A kind of mechanical seal structure for imitating petal type groove |
| CN108050258B (en) * | 2017-11-22 | 2019-06-07 | 南昌工程学院 | A kind of mechanical seal structure of imitative brambles shape type groove |
| CN108223799B (en) * | 2017-12-26 | 2021-03-30 | 南昌工程学院 | Bidirectional rotary fluid dynamic pressure type mechanical sealing structure |
| CN108916386A (en) * | 2018-08-30 | 2018-11-30 | 大连威尔博合金科技有限公司 | A kind of mechanical seal ring |
| CN110410504B (en) * | 2019-07-15 | 2021-06-18 | 北京航空航天大学 | Mechanical seal end face structure of variable-depth spiral T-shaped groove |
| CN110848392B (en) * | 2019-11-19 | 2021-11-19 | 潍柴动力股份有限公司 | Sealing structure and engine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1206801A (en) * | 1998-08-13 | 1999-02-03 | 王玉明 | Bidirectional rotation double-row double-blade spiral groove face sealing |
| CN2934785Y (en) * | 2006-01-27 | 2007-08-15 | 浙江工业大学 | Non-contact mechanical end surface sealing structure |
| CN201496542U (en) * | 2009-08-06 | 2010-06-02 | 浙江工业大学 | Three-dimensional fish scale-constructed underside-type trough fluid dynamic-pressure type liquid mechanical sealing structure |
| CN202501012U (en) * | 2012-03-22 | 2012-10-24 | 成都一通密封有限公司 | Bidirectional dry air sealing friction pair |
| CN103791097A (en) * | 2014-02-28 | 2014-05-14 | 江苏大学 | Combination fluid dynamic pressure groove mechanical seal ring capable of automatically discharging particles |
| CN104728451A (en) * | 2015-04-09 | 2015-06-24 | 江西省科学院应用物理研究所 | Directivity large hole and three-dimensional groove combined non-contact type mechanical sealing structure |
-
2017
- 2017-06-07 CN CN201710421524.1A patent/CN107218396B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1206801A (en) * | 1998-08-13 | 1999-02-03 | 王玉明 | Bidirectional rotation double-row double-blade spiral groove face sealing |
| CN2934785Y (en) * | 2006-01-27 | 2007-08-15 | 浙江工业大学 | Non-contact mechanical end surface sealing structure |
| CN201496542U (en) * | 2009-08-06 | 2010-06-02 | 浙江工业大学 | Three-dimensional fish scale-constructed underside-type trough fluid dynamic-pressure type liquid mechanical sealing structure |
| CN202501012U (en) * | 2012-03-22 | 2012-10-24 | 成都一通密封有限公司 | Bidirectional dry air sealing friction pair |
| CN103791097A (en) * | 2014-02-28 | 2014-05-14 | 江苏大学 | Combination fluid dynamic pressure groove mechanical seal ring capable of automatically discharging particles |
| CN104728451A (en) * | 2015-04-09 | 2015-06-24 | 江西省科学院应用物理研究所 | Directivity large hole and three-dimensional groove combined non-contact type mechanical sealing structure |
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