CN203285990U - Dovetail groove end face mechanical sealing structure capable of rotating in two directions - Google Patents
Dovetail groove end face mechanical sealing structure capable of rotating in two directions Download PDFInfo
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- CN203285990U CN203285990U CN2013200866062U CN201320086606U CN203285990U CN 203285990 U CN203285990 U CN 203285990U CN 2013200866062 U CN2013200866062 U CN 2013200866062U CN 201320086606 U CN201320086606 U CN 201320086606U CN 203285990 U CN203285990 U CN 203285990U
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- groove
- spiral chute
- arc groove
- dovetail groove
- dovetail
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- 238000007789 sealing Methods 0.000 title claims abstract description 30
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 15
- 238000002955 isolation Methods 0.000 claims 1
- 230000003068 static effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
A dovetail groove end face mechanical sealing structure capable of rotating in two directions comprises two mechanical sealing rings, namely the dynamic ring and the static ring. A plurality of dovetail grooves which are distributed along the circumference of the end face of the sealing ring and are capable of rotating in two directions are formed in the end face of at least one of the dynamic sealing ring and the static sealing ring, and each dovetail groove is composed of a pair of spiral grooves which are reversely arranged and a circular arc groove which is connected with the roots of the spiral grooves so that the grooves with the shapes being similar to forked tails can be formed. The spiral grooves are placed in the high-pressure side, namely the upstream, and the circular arc grooves are placed in the low-pressure side, namely the downstream. The directions of helix angles of the reversely-arranged spiral grooves are opposite.
Description
Technical field
The utility model relates to a kind of gas end surface mechanical sealing structure of rotary type fluid machine, but particularly a kind of gas seal end-face structure of bidirectional rotation is used for the shaft end seal of the rotating machineries such as various compressors, decompressor, pump, reactor.
Background technique
But the screw groove end face sealing of bidirectional rotation has been reported, as Chinese patent CN1364987A, CN1206801A and CN201496542U, Chinese science and technology periodical " lubricated and sealing " the 12nd phase in 2009, the page number is 60-62, foreign patent EP0499370A1, EP0632219A1, US6446976, US6575470 and US6726213 etc. all once openly reported, its end-face structure mainly is comprised of the several spiral chutes that are arranged symmetrically with and the sealing dam of not slotting, and some also comprises the radial air inlet groove.Although these Spiral Groove Dry Gas Seals by Uses have higher fluid film rigidity, larger bearing capacity and lower friction power loss etc. in certain rotating speed and pressure range, but but the bidirectional rotation spiral chute is due to the existence of opposing slot, opposing slot has interference effect for following current pumping dynamic pressure groove, make face opening power and gas film stiffness all decrease, particularly under high-speed condition, but the Dry Gas Seal type groove of existing bidirectional rotation still exists that gas film stiffness is large not, dynamic pressure effect is strong, face opening power reaches not greatly the deficiencies such as performance of noiseproof is poor.
Summary of the invention
For the deficiency such as overcome that but under the existing ubiquitous high speed of bidirectional rotation Spiral Groove Dry Gas Seals by Use, gas film stiffness is little, dynamic pressure effect is strong and face opening power is less or performance of noiseproof is poor, but the utility model provides a kind of dovetail groove end surface mechanical sealing structure of, bidirectional rotation that gas film stiffness large effective at high-speed working condition lower end surface hydrodynamic.
The technical solution of the utility model is:
But a kind of dovetail groove end surface mechanical sealing structure of bidirectional rotation, comprise two mechanical seal rings, be rotating ring, stationary ring, in described rotating ring and stationary ring, but the end face of at least one seal ring is provided with the dovetail groove of a plurality of bidirectional rotations along the end face circle distribution, each dovetail groove is comprised of the spiral chute of a pair of reversed arrangement and the arc groove of connection spiral chute root, form the type groove of the similar dovetail of profile, wherein to be positioned at high pressure side be upstream to spiral chute, and it is downstream that arc groove is positioned at low voltage side; Described reversed arrangement spiral fluted helix angle opposite direction, the occasion that mechanical seal is required applicable to different rotation directions; Described arc groove makes sealing medium can not form dead band in spiral chute, has strengthened the quick discharge of cooling and lubrication and the abrasive particle of end face.
Further, the described spiral fluted degree of depth is h
1=2～30 μ m, the preferred value scope is h
1=5～12 μ m; The degree of depth of described arc groove is h
2=2～30 μ m, the preferred value scope is h
2=2～10 μ m; Described dovetail groove arranges on end face number N is N=3～20, and the preferred value scope is N=4～16.
Further, described a pair of spiral chute edge in same dovetail groove circumferentially is arranged symmetrically with in pairs.
Further, described arc groove can be isocentric circular arc groove or straight-line groove or a pair of opposed type UNICOM type spiral chute.
Further, be provided with the radial air inlet groove in the middle of described spiral chute, described radial air inlet groove is not connected or connects perforation with arc groove.
Further, described radial air inlet groove and spiral chute and arc groove form whole dovetail groove.
Working principle of the present utility model:
Use for reference the fork-shaped tail structure feature of the swift likeness in form scissors that is fit to high-speed flight, adopt the face type channel profiles of fork-shaped empennage profile as dry gas seals.The fork-shaped empennage of swift likeness in form scissors is compared and is had higher ratio of lift coefficient to drag coefficient with other forms of empennage, can produce larger additional lift, and can effectively improve flexibility and the stability of flight in flight course.Simultaneously, the shape of empennage is adjusted at the expansion degree that swift can also be by changing empennage and sweepback angle etc., to realize stabilized flight under different flying speeds.In actual design, by changing the structural parameter such as radial width of spiral fluted helix angle and arc groove, can realize the uniformity that dovetail groove end face dry gas seals distributes on end face in friction speed operating mode downstream, can realize the through-flow of air-flow in dovetail groove, effective discharge of abrasive particle be can realize, and stable operation and normal unlatching of dry gas seals remained.
Advantage of the present utility model and beneficial effect:
(1) spiral chute and arc groove connect and conflux at groove root place, but fluid medium produces stronger compression effectiveness, thereby have better hydrodynamic effect, make the bearing capacity that is sealed under high-speed working condition stronger, and gas film stiffness is larger.Simultaneously, be arranged at the middle arc groove of end face end force is more evenly distributed, can further improve the gas film stiffness of sealing, strengthen the stability of sealing high speed operation.
(2) every pair of spiral chute that is arranged symmetrically with all comprises the following current pumping groove of a side and the adverse current pumping groove of opposite side, the following current pumping groove can produce stronger active and static pressure effect, flowing medium is pumped into seal face, and the adverse current pumping groove can will leak to the flowing medium blowback high pressure side of low voltage side, therefore can significantly reduce seal leakage.
(3) each arc groove has connected a pair of spiral fluted groove root; make sealing medium can not form dead band in spiral chute; be conducive to the quick discharge of contained solid particle in sealing medium or abrasive particle; reduced the abrasive wear of end face; arc groove also helps the Cooling and Lubricator situation of improving end face simultaneously; reduce power consumption and the envelope gas consumption of sealing, extended the working life of sealing.
(4) the utility model is by using for reference the fork-shaped tail structure of swift likeness in form scissors, be similar to swift and passing through to change the expansion degree of empennage to realize at a high speed or the stabilized flight under low speed under different flying speeds,, by changing the structural parameter such as radial width of spiral fluted helix angle and arc groove, can realize that dovetail groove end face dry gas seals remains stable operation and normal the unlatching under the friction speed operating mode.
(5) the utility model is applicable to that running shaft is rotated in the forward or the occasion of counter-rotating, all can form the fluid film of continous-stable between end face under different rotation directions require, and can effectively realize the sealing under the bidirectional rotation condition.
Description of drawings
But Fig. 1 is bidirectional rotation dovetail groove end view of the present utility model;
Fig. 2 is that the utility model arc groove is reverse opposed type UNICOM type spiral groove end plane schematic diagram;
Fig. 3 is the dovetail groove end view of the utility model band radial air inlet groove;
Fig. 4 is the dovetail groove end view of the utility model band radial air inlet groove;
Fig. 5 is that in the utility model, radially air inlet duct and spiral chute and arc groove form the end view of whole dovetail groove.
Embodiment
By reference to the accompanying drawings enforcement of the present utility model is described in further detail.
Embodiment one
With reference to Fig. 1, but a kind of dovetail groove end surface mechanical sealing structure of bidirectional rotation, comprise rotating ring, stationary ring of mechanical seal etc., in described rotating ring and stationary ring, but the end face of at least one seal ring is provided with the dovetail groove of a plurality of bidirectional rotations along the end face circle distribution, each dovetail groove is comprised of with the arc groove 3 of being connected and connect spiral chute 2 roots the spiral chute 21 of a pair of reversed arrangement, form the type groove of the similar dovetail of profile, wherein to be positioned at high pressure side be upstream to spiral chute 2, and it is downstream that arc groove 3 is positioned at low voltage side; Described reversed arrangement spiral chute 21 and 22 helix angle opposite direction, the occasion that mechanical seal is required applicable to different rotation directions; Described arc groove 3 makes sealing medium can not form dead band in spiral chute 2, has strengthened the quick discharge of cooling and lubrication and the abrasive particle of end face.
The degree of depth of described spiral chute 2 is h
1=2～30 μ m, the preferred value scope is h
1=5～12 μ m; The degree of depth of described arc groove 3 is h
2=2～30 μ m, the preferred value scope is h
2=2～10 μ m; Described dovetail groove arranges on end face number N is N=3～20, and the preferred value scope is N=4～16.
Described spiral chute 2 edge in same dovetail groove circumferentially is arranged symmetrically with in pairs.
Described arc groove 3 is the isocentric circular arc groove.
Embodiment two
With reference to Fig. 2, the present embodiment and embodiment's one difference is that described arc groove 3 is a pair of opposed type UNICOM type spiral chute 31 and 32.All the other structures and mode of execution are identical with embodiment one.
Embodiment three
With reference to Fig. 3, the present embodiment and embodiment's one difference is to have radial air inlet groove 5 between described spiral chute 21 and 22, and described radial air inlet groove 5 forms the communication type dovetail groove with spiral chute 2 and arc groove 3.All the other structures and mode of execution are identical with embodiment one.
Embodiment four
With reference to Fig. 4, the present embodiment and embodiment's two difference is to have radial air inlet groove 5 between described spiral chute 21 and 22, and described radial air inlet groove 5 forms the communication type dovetail groove with spiral chute 2 and opposed type UNICOM type spiral chute 31 and 32.All the other structures and mode of execution are identical with embodiment two.
Embodiment five
With reference to Fig. 5, the present embodiment and embodiment's one difference is that described radial air inlet groove and spiral chute and arc groove form whole dovetail groove.All the other structures and mode of execution are identical with embodiment one.
The described content of this specification embodiment is only enumerating the way of realization of model utility design; protection domain of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection domain of the present utility model also reaches in those skilled in the art according to the thinkable equivalent technologies means of the utility model design.
Claims (6)
1. but the dovetail groove end surface mechanical sealing structure of a bidirectional rotation, comprise two mechanical seal rings, be rotating ring, stationary ring, it is characterized in that: but in described rotating ring and stationary ring, the end face of at least one seal ring is provided with the dovetail groove of a plurality of bidirectional rotations along the end face circle distribution, each dovetail groove is comprised of the spiral chute of a pair of reversed arrangement and the arc groove of connection spiral chute root, form the type groove of the similar dovetail of profile, wherein to be positioned at high pressure side be upstream to spiral chute, and it is downstream that arc groove is positioned at low voltage side; Described reversed arrangement spiral fluted helix angle opposite direction.
2. sealing configuration according to claim 1, it is characterized in that: the described spiral fluted degree of depth is h
1=2 ~ 30 μ m, the preferred value scope is h
1=5 ~ 12 μ m; The degree of depth of described arc groove is h
2=1 ~ 30 μ m, the preferred value scope is h
2=1 ~ 10 μ m; Described dovetail groove arranges on end face number N is N=3 ~ 20, and the preferred value scope is N=4 ~ 16.
3. sealing configuration according to claim 2 is characterized in that: described a pair of spiral chute in same dovetail groove along circumferentially being arranged symmetrically with.
4. sealing configuration according to claim 3 is characterized in that: described arc groove can be isocentric circular arc groove or straight-line groove or a pair of opposed type UNICOM type spiral chute.
5. sealing configuration according to claim 4, is characterized in that: be provided with the radial air inlet groove in the middle of described spiral chute, radial air inlet groove and arc groove perforation.
6. sealing configuration according to claim 4, is characterized in that: be provided with the radial air inlet groove in the middle of described spiral chute, radial air inlet groove and arc groove isolation.
7.According to claim 5, or 6 described sealing configurations is characterized in that: described radial air inlet groove and spiral chute and arc groove form whole dovetail groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200866062U CN203285990U (en) | 2013-02-26 | 2013-02-26 | Dovetail groove end face mechanical sealing structure capable of rotating in two directions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200866062U CN203285990U (en) | 2013-02-26 | 2013-02-26 | Dovetail groove end face mechanical sealing structure capable of rotating in two directions |
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| Publication Number | Publication Date |
|---|---|
| CN203285990U true CN203285990U (en) | 2013-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200866062U Expired - Lifetime CN203285990U (en) | 2013-02-26 | 2013-02-26 | Dovetail groove end face mechanical sealing structure capable of rotating in two directions |
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| CN (1) | CN203285990U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103133697A (en) * | 2013-02-26 | 2013-06-05 | 浙江工业大学 | Bilaterally rotatable end surface mechanical sealing structure with dovetail grooves |
| CN107906206A (en) * | 2017-12-28 | 2018-04-13 | 温州市天成密封件制造有限公司 | It is a kind of can bidirectional rotation barrel cover type groove end surface mechanical sealing structure |
-
2013
- 2013-02-26 CN CN2013200866062U patent/CN203285990U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103133697A (en) * | 2013-02-26 | 2013-06-05 | 浙江工业大学 | Bilaterally rotatable end surface mechanical sealing structure with dovetail grooves |
| CN103133697B (en) * | 2013-02-26 | 2015-11-25 | 浙江工业大学 | Can the dovetail groove end surface mechanical sealing structure of bidirectional rotation |
| CN107906206A (en) * | 2017-12-28 | 2018-04-13 | 温州市天成密封件制造有限公司 | It is a kind of can bidirectional rotation barrel cover type groove end surface mechanical sealing structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131113 Effective date of abandoning: 20151125 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20131113 Effective date of abandoning: 20151125 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |