CN103410969A - Assembled type double-end-face corrugated pipe sealing device for high-temperature and easily-coked media - Google Patents
Assembled type double-end-face corrugated pipe sealing device for high-temperature and easily-coked media Download PDFInfo
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- CN103410969A CN103410969A CN2012105360818A CN201210536081A CN103410969A CN 103410969 A CN103410969 A CN 103410969A CN 2012105360818 A CN2012105360818 A CN 2012105360818A CN 201210536081 A CN201210536081 A CN 201210536081A CN 103410969 A CN103410969 A CN 103410969A
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Abstract
The invention discloses an assembled type double-end-face corrugated pipe sealing device for high-temperature and easily-coked media. The assembled type double-end-face corrugated pipe sealing device comprises blades, a shaft sleeve with one end provided with a circular conical surface, a movable ring, a baffle, a medium side static ring assembly, an atmospheric side static ring assembly, a scrapper, a locating sleeve, a contraction disc outer ring and a contraction disc inner ring. The medium side static ring assembly and the atmospheric side static ring assembly are respectively comprise a static ring, a static ring base, a metal corrugated pipe and a metal corrugated pipe base. The blades are arranged on the circular conical surface of the shaft sleeve. The movable ring, the medium side static ring assembly and the atmospheric side static ring assembly are respectively arranged on the shaft sleeve in a sleeved mode; the medium side static ring assembly and the atmospheric side static ring assembly are arranged on the medium side and the atmospheric side which are on the two sides of the movable ring respectively. The movable ring is fixed on the shaft sleeve through the locating sleeve and the baffle. The scrapper is arranged on the inner side of the end face of the static ring of the medium side static ring assembly. The contraction disc outer ring and the contraction disc inner ring which are arranged coaxially limit the shaft sleeve on a shaft. The assembled type double-end-face corrugated pipe sealing device for the high-temperature and easily-coked media is good in sealing performance, and prevents the media from being remained for a long term and being coked by high temperature.
Description
Technical field
The present invention relates to a kind ofly to be applicable to that road asphalt pump, steel works tar asphalt reclaim the transfer of highly viscous such as pump, oil refinery oil mud pump, hot oil pump, easily solidify, easily coking, high temperature can not cooling mediums and the shaft sealer that requires the rotating machinery of zero leakage medium such as inflammable, explosive, hypertoxic, especially for the unit loading type Double End bellow seal of the easy coking medium of high temperature.
Background technique
At present, for the road asphalt pump, the steel works tar asphalt reclaims pump, the oil refinery oil mud pump, the transfer of highly viscous such as hot oil pump, easily solidify, easily coking, high temperature can not cooling medium and inflammable, explosive, severe toxicity etc. requires the shaft sealing form of the rotating machinery of medium zero leakage to mainly contain single end face or adopts the Double End welded metal-bellows mechanical seal, near the easily coking seal face that the biggest problem that these two kinds of seal form run into while being used for above-mentioned medium is exactly seal ring, cause seal wears serious, cause seal failure, reason is that medium stops for a long time near seal face, owing to constantly absorbing heat and coking, another difficult problem is exactly that medium coking on corrugated pipe wall causes metal bellows to follow the string, thereby cause seal failure to cause dielectric leakage.
At present, method or the measure of the above-mentioned difficult problem of solution mainly contain: 1, pass into steam and carry out cooling; 2, injecting diesel oil or wax oil rinses cooling.The major defect that above-mentioned two kinds of methods or measure exist is: 1, have certain narrow limitation, do not have the equipment of above-mentioned supporting public system with it not adopt; 2, energy consumption is high, need expend a large amount of steam, diesel oil or wax oil; 3, easily produce the operation fluctuation, affect equipment safety production and quality of product.
Summary of the invention
For addressing the above problem, the invention discloses the unit loading type Double End bellow seal for the easy coking medium of high temperature, simple in structure, easy to use, debugging while installing without scene, good airproof performance, avoid long-term stop of medium and be subjected to high-temperature coking, and save energy and reduce the cost, improve the reliability of seal arrangement, extended the working life of seal arrangement.
Unit loading type Double End for the easy coking medium of high temperature bellow seal of the present invention, comprise blade, one end is provided with the axle sleeve of conical surface, rotating ring, baffle plate, the side medium static components, the atmospheric side static components, scraper, setting sleeve, shrink disk outer ring and shrink disk inner ring, described side medium static components and atmospheric side static components include stationary ring, stationary seat, metal bellows and wavy metal base, described blade is arranged on the conical surface of axle sleeve, described rotating ring, side medium static components and atmospheric side static components all are set on axle sleeve and side medium static components and atmospheric side static components are separately positioned on side medium and the atmospheric side of rotating ring both sides, described rotating ring is fixed on axle sleeve by setting sleeve and baffle plate, described scraper is arranged on the end face inboard of the stationary ring of side medium static components, shrink disk outer ring and the shrink disk inner ring of described coaxial setting are limited to axle sleeve on axle.The present invention is processed into the conical surface with certain taper by the outer radius at axle sleeve one end, can increase the radial clearance of wavy metal bore and shaft room, thereby guarantees that when the termination of pumping material returned medium herein can flow out smoothly; By on the conical surface of axle sleeve, blade being set, make the medium High Rotation Speed, thereby the tube wall of metal bellows is washed away with cooling, can increase the flowing velocity of medium herein, prevent medium coking on the bellows tube wall, crystallization, obstruction; By rotating ring is arranged on axle sleeve, and respectively be provided with side medium static components and atmospheric side static components at side medium and atmospheric side, and to metal bellows and stationary seat and wavy metal base employing weld connection, form the structure of a double seals, effectively prevent near the medium coking sealing surface of rotating ring; By on axle sleeve one side end face, being provided with tapped hole, and can on axle sleeve, locate and fix rotating ring by baffle plate, setting sleeve; Ring packing end face inboard by the stationary ring at side medium arranges several scrapers, can periodically strike off the medium sticked near the certain area of rotating ring sealing surface, periodically like this strike off, supplement and can play cooling action to this zone, thereby prevent that effectively this regional medium is because the long-term localized hyperthermia caused that stops causes coking; By shrink disk outer ring and the shrink disk inner ring arranged, can on axle, reliably locate axle sleeve.Unit loading type Double End for the easy coking medium of high temperature bellow seal disclosed by the invention, simple in structure, easy to use, debugging while installing without scene, good airproof performance, by the scraper arranged, periodically strike off and stick near the medium in the certain area rotating ring sealing surface, thereby play cooling action, avoid long-term stop of medium to cause localized hyperthermia and coking, and energy-saving and cost-reducing, improved the reliability of seal arrangement, simultaneously at rotating ring, stationary ring, in the Seal cage that stationary seat and flange form, inject block liquid, thereby realized the zero leakage of medium, the maintenance cost of reduction equipment, extended the working life of seal arrangement.
A kind of improvement of the bellow seal of the unit loading type Double End for the easy coking medium of high temperature disclosed by the invention, the described bellow seal of unit loading type Double End for the easy coking medium of high temperature also comprises antirotation keys, described stationary seat outer surface is provided with keyway, described antirotation keys and keyway are equipped with, and described metal bellows is connected to the stationary seat outside by keyway.This improvement is by the keyway arranged and the antirotation keys be equipped with, and while effectively preventing from starting, metal bellows twists distortion and easily twisted off, and has improved Security and the operation stability of equipment operation, has extended the working life of bellows.
Another improvement of unit loading type Double End for the easy coking medium of high temperature bellow seal disclosed by the invention, the described bellow seal of unit loading type Double End for the easy coking medium of high temperature also is provided with seal ring, on described axle sleeve with on the cooperation place of rotating ring end face and setting sleeve, be provided with seal groove with the cooperation place of rotating ring end face, described seal ring is arranged in seal groove.This improvement is by the seal groove that arranges and be filled in the seal ring in seal groove, has improved the sealing effect of seal arrangement, has avoided the leakage of medium, has guaranteed the normal operation of equipment, has improved seal arrangement and has used operational efficiency.
Another improvement of unit loading type Double End for the easy coking medium of high temperature bellow seal disclosed by the invention, the outer radius of described axle sleeve also is provided with the anti-rotation pin-and-hole and stop pin is housed, the inner radius of rotating ring is provided with the anti-rotation keyway, and described stop pin is inserted in the anti-rotation keyway.This improvement is by the stop pin and the anti-rotation keyway that arrange, effectively improved the linkage of axle sleeve and rotating ring, effectively avoid the friction of skidding of axle sleeve and rotating ring in running, avoid equipment to be in operation because of insufficient the bumping that be connected, reduced the wear rate of axle sleeve and rotating ring, extend working life, reduced maintenance cost.
Another improvement of unit loading type Double End for the easy coking medium of high temperature bellow seal disclosed by the invention, the described bellow seal of unit loading type Double End for the easy coking medium of high temperature also is provided with flange I, flange II and clamping bolt, described flange I and flange II are set in the antirotation keys outside side by side, and by clamping bolt, connect between flange I and flange II.This improvement by being fixed on rotating ring on axle sleeve and side medium static components and flange I thereof, atmospheric side static components and the flange II is bolted the shrink disk outer ring and shrink disk inner ring, limiting stopper form unit loading type Double End wavy metal tube sealing device, in the Seal cage that rotating ring, stationary ring, stationary seat and flange form, inject block liquid, thereby realized the zero leakage of medium.This improvement is by the flange that is connected and fixed use arranged, and simple in structure, stable connection, be easy to demolition and maintenance simultaneously, improved the maintenance efficiency of equipment.
Another of unit loading type Double End for the easy coking medium of high temperature bellow seal disclosed by the invention improved, and on described flange II, also is provided with through hole and covers the dust cover on through hole.This improvement is convenient to inject block liquid in the Seal cage of rotating ring, stationary ring, stationary seat and flange formation by the through hole arranged, be convenient to guarantee Seal cage internal congestion liquid abundance in continuous operations, keep the Seal cage internal pressure stable, the stability of raising equipment sealability in the continuous operations process, the using effect of raising equipment, guarantee continuous production and stability.
Unit loading type Double End for the easy coking medium of high temperature bellow seal disclosed by the invention, taked to prevent that medium from the structural design of coking occurring at some position, with the prior art scheme, compare and can save energy and reduce the cost, improve reliability and the working life of seal arrangement, adopt simultaneously the form of unit loading type design, make installation and maintenance convenient, adopt the double seals form, can realize the zero leakage of medium, simple in structure, easy to use, good airproof performance, coking occurs in the equipment that effectively prevents in running, effectively reduce simultaneously the wear rate of equipment component in running, the maintenance cost of reduction equipment, increase the service life, continuity and the stability of equipment operation have been improved, improved the efficiency of producing, thereby meet the requirement that people are more and more higher to this type of medium-tight device.
The accompanying drawing explanation
Fig. 1, general assembly drawing of the present invention;
The structural representation of Fig. 2, stationary ring of the present invention;
Reference numerals list: 1, limiting stopper, 2, scraper, 3, the shrink disk outer ring, 4, shrink disk inner ring, 5, metal bellows, 6, baffle plate, 7, setting sleeve, 8, antirotation keys, 9, the atmospheric side static components, 10, rotating ring, 11, the side medium static components, 12, the flange I, 13, V-type circle, 14, axle sleeve, 15, seal ring, 16, stop pin, 17, the flange II, 18, dust cover.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand following embodiment and only be used to the present invention is described, is not used in and limits the scope of the invention.
As depicted in figs. 1 and 2, the bellow seal of the unit loading type Double End for the easy coking medium of high temperature of the present invention, comprise blade, one end is provided with the axle sleeve 14 of conical surface, rotating ring 10, baffle plate 6, side medium static components 11, atmospheric side static components 9, scraper 2, setting sleeve 7, shrink disk outer ring 3 and shrink disk inner ring 4, described side medium static components 11 and atmospheric side static components 9 include stationary ring, stationary seat, metal bellows 5 and wavy metal base, described blade are arranged on the conical surface of axle sleeve 14, described rotating ring 10, side medium static components 11 and atmospheric side static components 9 all are set on axle sleeve 14 and side medium static components 11 and atmospheric side static components 9 are separately positioned on side medium and the atmospheric side of rotating ring 10 both sides, described rotating ring 10 is fixed on axle sleeve 14 by setting sleeve 7 and baffle plate 6, described scraper 2 is arranged on the end face inboard of the stationary ring of side medium static components 11, and shrink disk outer ring 3 and the shrink disk inner ring 4 of described coaxial setting are limited to axle sleeve 14 on axle.The present invention is processed into the conical surface with certain taper by the outer radius at axle sleeve one end, can increase the radial clearance of wavy metal bore and shaft room, thereby guarantees that when the termination of pumping material returned medium herein can flow out smoothly; By on the conical surface of axle sleeve, blade being set, make the medium High Rotation Speed, thereby the tube wall of metal bellows is washed away with cooling, can increase the flowing velocity of medium herein, prevent medium coking on the bellows tube wall, crystallization, obstruction; By rotating ring is arranged on axle sleeve, and respectively be provided with side medium static components and atmospheric side static components at side medium and atmospheric side, and to metal bellows and stationary seat and wavy metal base employing weld connection, form the structure of a double seals, effectively prevent near the medium coking sealing surface of rotating ring; By on axle sleeve one side end face, being provided with tapped hole, and can on axle sleeve, locate and fix rotating ring by baffle plate, setting sleeve; Ring packing end face inboard by the stationary ring at side medium arranges several scrapers, can periodically strike off the medium sticked near the certain area of rotating ring sealing surface, periodically like this strike off, supplement and can play cooling action to this zone, thereby prevent that effectively this regional medium is because the long-term localized hyperthermia caused that stops causes coking; By shrink disk outer ring and the shrink disk inner ring arranged, can on axle, reliably locate axle sleeve.Disclosed by the inventionly for the easy coking medium of high temperature, be assembled into unit loading type Double End bellow seal, simple in structure, easy to use, debugging while installing without scene, good airproof performance, by the scraper arranged, periodically strike off and stick near the medium in the certain area rotating ring sealing surface, thereby play cooling action, avoid long-term stop of medium to cause localized hyperthermia and coking, and energy-saving and cost-reducing, improved the reliability of seal arrangement, simultaneously at rotating ring, stationary ring, in the Seal cage that stationary seat and flange form, annotate and inject block liquid, thereby realized the zero leakage of medium, the maintenance cost of reduction equipment, extended the working life of seal arrangement.Inject
As a kind of preferred, the described bellow seal of unit loading type Double End for the easy coking medium of high temperature also comprises antirotation keys 8, described stationary seat outer surface is provided with keyway, and described antirotation keys 8 is equipped with keyway, and described metal bellows 5 is connected to the stationary seat outside by keyway.The present invention is by the keyway arranged and the antirotation keys be equipped with, and while effectively preventing from starting, metal bellows twists distortion and easily twisted off, and has improved Security and the operation stability of equipment operation, has extended the working life of bellows.
As a kind of preferred, the described bellow seal of unit loading type Double End for the easy coking medium of high temperature also is provided with seal ring 15, on described axle sleeve 14 with on the cooperation place of rotating ring end face and setting sleeve, be provided with seal groove with the cooperation place of rotating ring end face, described seal ring 15 is arranged in seal groove.The present invention is by the seal groove that arranges and be filled in the seal ring in seal groove, has improved the sealing effect of seal arrangement, has avoided the leakage of medium, has guaranteed the normal operation of equipment, has improved seal arrangement and has used operational efficiency.
As a kind of preferred, the outer radius of described axle sleeve 14 also is provided with the anti-rotation pin-and-hole and stop pin 16 is housed, and the inner radius of rotating ring is provided with the anti-rotation keyway, and described stop pin 16 is inserted in the anti-rotation keyway.The present invention is by the stop pin and the anti-rotation keyway that arrange, effectively improved the linkage of axle sleeve and rotating ring, effectively avoid the friction of skidding of axle sleeve and rotating ring in running, avoid equipment to be in operation because of insufficient the bumping that be connected, reduced the wear rate of axle sleeve and rotating ring, extend working life, reduced maintenance cost.
As a kind of preferred, the described bellow seal of unit loading type Double End for the easy coking medium of high temperature also is provided with flange I 12, flange II 17 and clamping bolt, described flange I 12 and flange II 17 are set in antirotation keys 8 outsides side by side, and by clamping bolt, connect between flange I 12 and flange II 17.The present invention by being fixed on rotating ring on axle sleeve and side medium static components and flange I thereof, atmospheric side static components and the flange II is bolted the shrink disk outer ring and shrink disk inner ring, limiting stopper form unit loading type Double End wavy metal tube sealing device, in the Seal cage that rotating ring, stationary ring, stationary seat and flange form, inject block liquid, thereby realized the zero leakage of medium.The present invention is by the flange that is connected and fixed use arranged, and simple in structure, stable connection, be easy to demolition and maintenance simultaneously, improved the maintenance efficiency of equipment.
As a kind of preferred, on described flange II 17, also be provided with through hole and cover the dust cover 18 on through hole.The present invention is convenient to inject block liquid in the Seal cage of rotating ring, stationary ring, stationary seat and flange formation by the through hole arranged, be convenient to guarantee Seal cage internal congestion liquid abundance in continuous operations, keep the Seal cage internal pressure stable, the stability of raising equipment sealability in the continuous operations process, the using effect of raising equipment, guarantee continuous production and stability.
As shown in Figure 1, inner radius at axle sleeve 14 is provided with seal groove and V-type circle 13 is housed, for preventing that medium from leaking along axle sleeve 14 and the annular space of axle, an end inner radius at axle sleeve 14 is processed with the conical surface coordinated with shrink disk inner ring 4, on a side end face of axle sleeve 14, be provided with some tapped holes, outer radius at the opposite side of axle sleeve 14 is processed into taper shape, and be provided with some blades, outer radius at axle sleeve 14 also is provided with the anti-rotation pin-and-hole, and stop pin 16 is housed, the inner radius of rotating ring 10 is provided with the anti-rotation keyway, rotating ring 10 is packed on axle sleeve 14, stop pin 16 is inserted in the anti-rotation keyway.On end face of rotating ring 10 and axle sleeve 14, have the end contact of seal groove, in seal groove, place seal ring 15, other end and the end contact that is enclosed within the setting sleeve 7 on axle sleeve 14, be used to stoping medium along the rotating ring end face to external leakage.Rotating ring 10 is accurately located and fixes on axle sleeve 14 by setting sleeve 7, baffle plate 6, clamping bolt acting in conjunction.Axle sleeve 14 can accurately be located and fix by shrink disk outer ring 3, shrink disk inner ring 4, clamping bolt on axle.Side medium static components 11 is assembled by stationary ring, stationary seat, metal bellows 5, wavy metal base, and be combined into side medium stationary ring unit with flange I 12, antirotation keys 8, stationary ring seal face inner radius is provided with several scrapers 2, outer radius at stationary seat is provided with keyway, and this keyway and antirotation keys 8 form stationary ring anti-rotation unit.Atmospheric side static components 9 is assembled by stationary ring, stationary seat, metal bellows 5, wavy metal base, and be combined into atmospheric side stationary ring unit with flange II 17, antirotation keys 8, outer radius at stationary seat is provided with keyway, and forms stationary ring anti-rotation unit with antirotation keys 8.Flange I 12 is connected by clamping bolt with flange II 17, and appropriate location guarantees the coaxality of flange I 12 and flange II 17 by the seam of processing on flange, the sealing between end face of flange realizes by the seal groove of offering on flange II 17 the seal ring of installing.Through hole is offered in appropriate location in flange II 17, and in Seal cage, injects block liquid at this.Limiting stopper 1, bolt form the location unit between rotating ring and stationary ring jointly, and seal arrangement, after on the pump housing, end being installed, needs this location unit is removed.
Unit loading type Double End for the easy coking medium of high temperature bellow seal disclosed by the invention, taked to prevent that medium from the structural design of coking occurring at some position, with the prior art scheme, compare and can save energy and reduce the cost, improve reliability and the working life of seal arrangement, adopt simultaneously the form of unit loading type design, make installation and maintenance convenient, adopt the double seals form, can realize the zero leakage of medium, simple in structure, easy to use, install and use effect high, good airproof performance, coking occurs in the equipment that effectively prevents in running, effectively reduce simultaneously the wear rate of equipment component in running, the maintenance cost of reduction equipment, increase the service life, continuity and the stability of equipment operation have been improved, improved the efficiency of producing, thereby meet the requirement that people are more and more higher to this type of medium-tight device.
The disclosed technological means of the present invention program is not limited only to the disclosed technological means of above-mentioned technological means, also comprises the technological scheme be comprised of above technical characteristics combination in any.The above is the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also are considered as protection scope of the present invention.
Claims (6)
1. for the unit loading type Double End bellow seal of the easy coking medium of high temperature, it is characterized in that: it comprises blade, one end is provided with the axle sleeve of conical surface, rotating ring, baffle plate, the side medium static components, the atmospheric side static components, scraper, setting sleeve, shrink disk outer ring and shrink disk inner ring, described side medium static components and atmospheric side static components include stationary ring, stationary seat, metal bellows and wavy metal base, described blade is arranged on the conical surface of axle sleeve, described rotating ring, side medium static components and atmospheric side static components all are set on axle sleeve and side medium static components and atmospheric side static components are separately positioned on side medium and the atmospheric side of rotating ring both sides, described rotating ring is fixed on axle sleeve by setting sleeve and baffle plate, described scraper is arranged on the end face inboard of the stationary ring of side medium static components, shrink disk outer ring and the shrink disk inner ring of described coaxial setting are limited to axle sleeve on axle.
2. the bellow seal of the unit loading type Double End for the easy coking medium of high temperature according to claim 1, it is characterized in that: the described bellow seal of unit loading type Double End for the easy coking medium of high temperature also comprises antirotation keys, described stationary seat outer surface is provided with keyway, described antirotation keys and keyway are equipped with, and described metal bellows is connected to the stationary seat outside by keyway.
3. the bellow seal of the unit loading type Double End for the easy coking medium of high temperature according to claim 1, it is characterized in that: the described bellow seal of unit loading type Double End for the easy coking medium of high temperature also is provided with seal ring, on described axle sleeve with on the cooperation place of rotating ring end face and setting sleeve, be provided with seal groove with the cooperation place of rotating ring end face, described seal ring is arranged in seal groove.
4. the bellow seal of the unit loading type Double End for the easy coking medium of high temperature according to claim 1, it is characterized in that: the outer radius of described axle sleeve also is provided with the anti-rotation pin-and-hole and stop pin is housed, the inner radius of rotating ring is provided with the anti-rotation keyway, and described stop pin is inserted in the anti-rotation keyway.
5. the bellow seal of the unit loading type Double End for the easy coking medium of high temperature according to claim 1 and 2, it is characterized in that: the described bellow seal of unit loading type Double End for the easy coking medium of high temperature also is provided with flange I, flange II and clamping bolt, described flange I and flange II are set in the antirotation keys outside side by side, and by clamping bolt, connect between flange I and flange II.
6. the bellow seal of the unit loading type Double End for the easy coking medium of high temperature according to claim 6, is characterized in that: on described flange II, also be provided with through hole and cover the dust cover on through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105360818A CN103410969A (en) | 2012-12-13 | 2012-12-13 | Assembled type double-end-face corrugated pipe sealing device for high-temperature and easily-coked media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105360818A CN103410969A (en) | 2012-12-13 | 2012-12-13 | Assembled type double-end-face corrugated pipe sealing device for high-temperature and easily-coked media |
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| Publication Number | Publication Date |
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| CN103410969A true CN103410969A (en) | 2013-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105360818A Pending CN103410969A (en) | 2012-12-13 | 2012-12-13 | Assembled type double-end-face corrugated pipe sealing device for high-temperature and easily-coked media |
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| CN (1) | CN103410969A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105909799A (en) * | 2016-06-20 | 2016-08-31 | 成都通密封股份有限公司 | Ultralow-temperature dry gas seal |
| CN110486475A (en) * | 2019-09-12 | 2019-11-22 | 中国石油大学胜利学院 | A kind of wave bullet formula mechanically-sealing apparatus |
-
2012
- 2012-12-13 CN CN2012105360818A patent/CN103410969A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105909799A (en) * | 2016-06-20 | 2016-08-31 | 成都通密封股份有限公司 | Ultralow-temperature dry gas seal |
| CN110486475A (en) * | 2019-09-12 | 2019-11-22 | 中国石油大学胜利学院 | A kind of wave bullet formula mechanically-sealing apparatus |
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Application publication date: 20131127 |