CN111677871B - Mechanical sealing device for double-channel three-stage series-parallel rotary transmission - Google Patents
Mechanical sealing device for double-channel three-stage series-parallel rotary transmission Download PDFInfo
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- CN111677871B CN111677871B CN202010553134.1A CN202010553134A CN111677871B CN 111677871 B CN111677871 B CN 111677871B CN 202010553134 A CN202010553134 A CN 202010553134A CN 111677871 B CN111677871 B CN 111677871B
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- Prior art keywords
- shell
- ring
- mechanical sealing
- inner ring
- channel
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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
- F16J15/3436—Pressing means
- F16J15/3452—Pressing means the pressing force resulting from the action of a spring
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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
- F16J15/3464—Mounting of the seal
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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
- F16J15/3496—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member use of special materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a double-channel three-stage series-parallel rotary transmission mechanical sealing device, which relates to the technical field of mechanical dynamic sealing and particularly comprises a shell and an inner ring, wherein the inner wall of the shell is fixedly connected with bearings, the inner wall of the shell is movably connected with a mechanical sealing pair, the inner ring is fixedly connected inside the bearings, the mechanical sealing pair is movably sleeved on the side surface of the inner ring, the side surface of the shell is provided with a liquid inlet cavity, the inner wall of the shell is provided with liquid return cavities, the number of the bearings is two, and the two bearings are respectively fixedly connected at the positions of the top and the bottom of the inner wall of the shell. By arranging the inner ring, the shell and the mechanical sealing pair, the effect of perfect sealing under severe environment is achieved, and the problems that the ceramic mechanical seal bears severe environments such as temperature impact, wide temperature range and mechanical vibration impact are solved.
Description
Technical Field
The invention relates to a mechanical dynamic seal, in particular to a double-channel three-stage series-parallel rotary transmission mechanical seal device.
Background
The mechanical seal is a device for preventing fluid leakage, which is formed by at least one pair of end surfaces perpendicular to a rotation axis and keeping adhesion and relative sliding under the action of a fluid pressure and a compensation mechanism (or magnetic force) and the cooperation of auxiliary seals, and the mechanical dynamic seal using the ceramic seal ring has the advantages of good sealing performance, long service life and strong corrosion resistance, and is widely and well-developed in the industries of nuclear power, petrochemical industry, ships and the like. Under the environmental conditions of temperature impact, wide temperature range and mechanical vibration impact, the ceramic seal has the problem of easy stress damage, and meanwhile, the design direction of the product also tends to have high flow, small volume and high environmental adaptability.
The stability of the mechanical seal ring during operation is an important factor affecting the stability of the mechanical seal, and improving the structural rigidity, the rotational support rigidity and the rotational accuracy of the sealing device is the most effective method.
Ceramic ring stiffness is an important parameter affecting mechanical sealing performance, increasing ceramic ring height is an effective method for improving stiffness, but increasing ceramic ring height will reduce the flow area and flow of liquid, directly affecting the cooling effect of the device.
The invention adopts a minimum three-stage series-parallel mechanical sealing structure for the first time to form the double-channel liquid rotary transmission device. The three-stage ceramic sealing assembly is adopted to form two independent closed cavities with rotary dynamic sealing boundaries, so that rotary fluid transmission is realized, and the height and rigidity of the ceramic ring are improved on the premise of realizing the same flow area and flow capacity.
The device shell and the inner ring adopt an integral, split or combined structure, a high-rigidity supporting piece is formed on the premise of being convenient for processing and forming, the rigidity of the whole device is improved, the stability of mechanical dynamic seal in the operation process is ensured, a bearing capable of eliminating gaps is used as a rotary support of the mechanical seal device and a back-to-back pairing installation mode, the rotary support rigidity is improved, and the structural member adopts corrosion-resistant materials such as stainless steel, titanium alloy and the like, so that the problem of environmental adaptability of the mechanical seal device under severe conditions such as temperature impact, wide temperature range, mechanical vibration impact, salt fog and the like is solved, and the service life and reliability of dynamic seal are improved.
At present, no relevant report is made on a high-reliability long-service-life dual-channel three-stage hybrid rotary transmission mechanical sealing device under severe environmental conditions such as temperature impact, wide temperature range, mechanical vibration impact and the like.
Disclosure of Invention
The invention aims to provide a double-channel three-stage series-parallel rotary transmission mechanical sealing device, which is used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a tertiary series-parallel rotary transmission mechanical seal device of binary channels, includes shell and inner ring, mechanical seal is vice including narrow ring and wide ring, one side swing joint of narrow ring and one side swing joint of wide ring, the surface of the metal base of wide ring is provided with the chamfer, the inner wall fixedly connected with bearing of shell, the inner wall swing joint of shell has mechanical seal vice, inner ring fixed connection is in the inside of bearing, mechanical seal vice activity cup joints the side at the inner ring, the feed liquor chamber has been seted up to the side of shell, the liquid return chamber has been seted up to the inner wall of shell.
As a further scheme of the invention: the number of the bearings is two, and the two bearings are respectively and fixedly connected at the positions of the topmost part and the bottommost part of the inner wall of the shell.
As a further scheme of the invention: the shell and the inner ring can be in an integral, split or combined structure.
As a further scheme of the invention: the materials of the outer shell and the inner ring can be corrosion-resistant materials such as stainless steel, titanium alloy, aluminum alloy and the like.
As a further scheme of the invention: the number of the mechanical seal pairs is three, and the three mechanical seal pairs are uniformly and movably connected in the shell.
As a further scheme of the invention: the narrow ring adopts an integral structure.
As a further scheme of the invention: and bearing rotary supporting pieces capable of eliminating gaps are adopted at two ends of the mechanical sealing pair.
As still further aspects of the invention: the operation steps are as follows:
step one, installing the sealing device at a position which is required to be sealed on related machinery;
step two, the inner ring and the outer shell form relative rotation, the wide ring and the outer shell are connected into a whole, and the narrow ring and the inner ring are connected in a floating way;
and step three, the wide ring and the narrow ring rotate relatively along with the shell and the inner ring, and the joint planes of the wide ring and the narrow ring always keep joint, so that the fluid is sealed in the cavity, and the rotary dynamic seal of the fluid is realized.
Compared with the prior art, the invention has the beneficial effects that:
1. through setting up inner ring, shell and mechanical seal pair, inner ring and shell form relative rotation, and wide ring and shell link as an organic wholely, and narrow ring and inner ring float to be connected, and wide ring and narrow ring both follow shell and inner ring relative rotation, and the plane of laminating between them remains the laminating throughout to seal fluid in the cavity, realize fluidic rotatory dynamic seal through the mechanical seal pair of tertiary setting, reached also can perfect seal's effect under adverse circumstances, solved ceramic mechanical seal and born the problem of adverse circumstances such as temperature impact, wide temperature range and mechanical vibration impact.
2. The ceramic material is used as the auxiliary material of the mechanical seal, the shell and the inner ring are made of corrosion-resistant high-strength materials, the service life of the ceramic material is prolonged, and the service life of the ceramic material can reach 5 ten thousand hours or 10 years through testing.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a dual-channel three-stage series-parallel rotary transmission mechanical sealing device.
Fig. 2 is a schematic diagram of the internal structure of a dual-channel three-stage series-parallel rotary transmission mechanical sealing device.
Fig. 3 is a schematic diagram of a mechanical seal ring structure in a two-channel three-stage series-parallel rotary transmission mechanical seal device.
Fig. 4 is a structural outline diagram of the wide ring position in the double-channel three-stage series-parallel rotary transmission mechanical sealing device.
As shown in the figure: 1. a mechanical seal pair; 2. an inner ring; 3. a housing; 4. a liquid inlet cavity; 5. a liquid return cavity; 6. and (3) a bearing.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1-4, in the embodiment of the invention, a dual-channel three-stage series-parallel rotary transmission mechanical sealing device comprises a housing 3 and an inner ring 2, wherein the inner ring 2 is rotationally connected with the housing 3 through a support bearing, a fluid flow channel is also designed in the inner ring 2, the difficult problems of rigidity of a rigidity structural member and manufacturing of a complex flow channel are solved by adopting technologies such as casting, welding, machining and the like, the housing 3 and the inner ring 2 can be in an integral, split or combined structure, the housing 3 and the inner ring 2 can be made of corrosion-resistant materials such as stainless steel, titanium alloy, aluminum alloy and the like, the inner wall of the housing 3 is fixedly connected with two bearings 6, the two bearings 6 are respectively and fixedly connected at the positions of the topmost part and the bottommost part of the inner wall of the housing 3, the inner wall of the housing 3 is movably connected with a mechanical sealing pair 1 which is a key component of the device, the number of the mechanical sealing pair 1 is three, the three layers of mechanical sealing pair 1 are uniformly and movably connected in the shell 3, the mechanical sealing pair 1 comprises a narrow ring 101 and a wide ring 102, one side of the narrow ring 101 is movably connected with one side of the wide ring 102, the narrow ring 101 adopts an integral structure, the bottom of the narrow ring 101 is provided with elastic compensation elements such as a cylindrical spring, a wave spring, a cylindrical spring group and the like, the elastic compensation elements are used as pre-compression elements of the paired mechanical sealing pair 1 and height compensation elements after the abrasion of the narrow ring 101, the mechanical sealing pair 1 can keep fit no matter what working condition, the narrow ring 1 adopts an integral structure, a peripheral metal base is removed, the problem of heated extrusion caused by the difference of thermal expansion coefficients of ceramics and metals is avoided, the static sealing link is reduced, the sealing reliability is improved, the surface of the metal base of the wide ring 102 is provided with chamfer angles, the chamfer is added on the mounting base of the wide ring 102, on the premise of not influencing the structural rigidity and strength, the flow area of fluid is increased, the sharp edge after the chamfer is increased is converted into a gradual transition structure, the turbulence phenomenon of the fluid in the flowing process is reduced, the flow resistance is reduced, the weight of a structural member is lightened, the specific rigidity of the structural member is improved, the two ends of the mechanical sealing pair 1 adopt bearing rotary supporting pieces capable of eliminating gaps, the two ends adopt bearings with larger rotary supporting rigidity, capable of eliminating gaps and smaller friction moment as rotary supporting, a back-to-back pairing assembly structure is adopted, the rotary supporting rigidity is improved, the stability of the mechanical sealing pair 1 in the running process is ensured, the inner ring 2 is fixedly connected in the bearing 6, the mechanical sealing pair 1 is movably sleeved on the side surface of the inner ring 2, the side surface of the shell 3 is provided with a liquid inlet cavity 4, the inner wall of the shell 3 is provided with the liquid return cavity 5, the division of the liquid inlet cavity 4 and the liquid return cavity 5 and external dynamic sealing are realized by using the least number of pairs of mechanical sealing pairs 1, so that the structural size of the ceramic ring is increased, the rigidity of the ceramic ring is improved, under the condition that the volume and the external dimension of the device are unchanged, the flow area and the flow are increased to the greatest extent, a pair of ceramic rings is used for dividing the liquid inlet cavity 4 and the liquid return cavity 5, external leakage is changed into internal leakage of the system, the possibility of the device for external leakage is reduced, a pair of ceramic rings is used for dividing the liquid inlet cavity 4 and the liquid return cavity 5, the pressure difference at two sides of the mechanical sealing pair 1 made of ceramic is reduced, the reliability of dynamic sealing is improved, three pairs of mechanical sealing pairs 1 are vertically distributed from top to bottom, and a three-stage series-parallel structure of upper independent closed cavities and lower independent closed cavities is formed, and the specific operation steps are as follows:
step one, installing the sealing device at a position which is required to be sealed on related machinery;
step two, the inner ring 2 and the outer shell 3 form relative rotation, the wide ring 102 and the outer shell 3 are connected into a whole, and the narrow ring 101 is in floating connection with the inner ring 2;
and step three, the wide ring 102 and the narrow ring 101 rotate relatively along with the outer shell 3 and the inner ring 2, and the joint planes of the wide ring 102 and the narrow ring are always kept joint, so that the fluid is sealed in the cavity, and the rotary dynamic seal of the fluid is realized.
When the inner ring and the outer ring rotate relatively, the wide ring and the outer ring are connected into a whole, the narrow ring 101 is connected with the inner ring 2 in a floating way, the wide ring 102 and the narrow ring 101 rotate relatively along with the narrow ring, a cavity formed between the inner ring 2 and the outer ring 3 is a fluid flow channel, fluid exists in the cavity and is not influenced by the relative rotation of the inner ring 2 and the outer ring 3, so that the rotary transmission of the fluid is realized, the sealing ring of the mechanical sealing pair 1 made of ceramics is a dynamic sealing element, the compensating spring is an elastic element for ensuring the mechanical sealing pair 1 made of ceramics to be always attached, the compensating element is also an element after the narrow ring 101 is worn, and the planes attached to the two are always attached, so that the fluid is sealed in the liquid return cavity 5, and the rotary sealing of the fluid is realized, and the rotary sealing effect is achieved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the foregoing embodiments may be modified or equivalents may be substituted for elements thereof, and that any modifications, equivalents, improvements or changes that fall within the spirit and principles of the present invention are intended to be within the scope of the present invention, and that those not specifically described in the present specification are within the skill of the art.
Claims (6)
1. The double-channel three-stage series-parallel rotary transmission mechanical sealing device comprises a shell (3) and an inner ring (2), and is characterized in that a bearing (6) is fixedly connected to the inner wall of the shell (3), a mechanical sealing pair (1) is movably connected to the inner wall of the shell (3), the inner ring (2) is fixedly connected to the inside of the bearing (6), and the mechanical sealing pair (1) is movably sleeved on the side face of the inner ring (2); the mechanical sealing pair (1) comprises a narrow ring (101) and a wide ring (102), one side of the narrow ring (101) is movably connected with one side of the wide ring (102), the shell (3) and the inner ring (2) can be in an integral, split or combined structure, the surface of a metal base of the wide ring (102) is provided with a chamfer, on the premise that the structural rigidity and strength are not affected, the flow area of fluid is increased, a sharp edge after the chamfer is increased is converted into a gradual transition structure, the phenomenon of parameter turbulence of the fluid in the flowing process is reduced, the flow resistance is reduced, the weight of a structural member is lightened, and the specific rigidity of the structural member is improved; a liquid inlet cavity (4) is formed in the side face of the shell (3), and a liquid return cavity (5) is formed in the inner wall of the shell (3); the number of the mechanical sealing pairs (1) is three, and the three mechanical sealing pairs (1) are uniformly and movably connected in the shell (3).
2. The dual-channel three-stage series-parallel rotary transmission mechanical sealing device according to claim 1, wherein the number of the bearings (6) is two, and the two bearings (6) are respectively fixedly connected at the positions of the topmost part and the bottommost part of the inner wall of the shell (3).
3. The double-channel three-stage series-parallel rotary transmission mechanical sealing device according to claim 1 is characterized in that stainless steel, titanium alloy and aluminum alloy can be adopted as the materials of the outer shell (3) and the inner ring (2).
4. The dual-channel three-stage series-parallel rotary transmission mechanical sealing device according to claim 1, wherein the narrow ring (101) adopts an integral structure.
5. The mechanical sealing device for the double-channel three-stage series-parallel rotary transmission of the claim 1 is characterized in that bearing rotary supporting pieces capable of eliminating gaps are adopted at two ends of the mechanical sealing pair (1).
6. The mechanical sealing device for double-channel three-stage series-parallel rotary transmission according to claim 1, which is characterized by comprising the following operation steps:
step one, installing the sealing device at a position which is required to be sealed on related machinery;
step two, the inner ring (2) and the outer shell (3) form relative rotation, the wide ring (102) and the outer shell (3) are connected into a whole, and the narrow ring
(101) Is connected with the inner ring (2) in a floating way;
step three, the wide ring (102) and the narrow ring (101) rotate relatively along with the outer shell (3) and the inner ring (2), and are attached to each other
The plane is always kept in contact, so that the fluid is sealed in the cavity, and the rotary dynamic seal of the fluid is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010553134.1A CN111677871B (en) | 2020-06-17 | 2020-06-17 | Mechanical sealing device for double-channel three-stage series-parallel rotary transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010553134.1A CN111677871B (en) | 2020-06-17 | 2020-06-17 | Mechanical sealing device for double-channel three-stage series-parallel rotary transmission |
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| Publication Number | Publication Date |
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| CN111677871A CN111677871A (en) | 2020-09-18 |
| CN111677871B true CN111677871B (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010553134.1A Active CN111677871B (en) | 2020-06-17 | 2020-06-17 | Mechanical sealing device for double-channel three-stage series-parallel rotary transmission |
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Families Citing this family (1)
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| CN114683101A (en) * | 2022-04-29 | 2022-07-01 | 中国电子科技集团公司第十四研究所 | Forming method of fluid rotary joint rotating shaft |
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| GB1104896A (en) * | 1965-12-21 | 1968-03-06 | Robert Martin Voitik | Fluid seal |
| US3888495A (en) * | 1972-06-09 | 1975-06-10 | Ehrhard Mayer | Dual-cooled slide ring seal |
| JPH10159714A (en) * | 1996-12-03 | 1998-06-16 | Keihin Corp | Swash plate type pump |
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| CN202710746U (en) * | 2012-03-21 | 2013-01-30 | 北京航天星汉科技有限公司 | Water hinge sealed by machinery end face |
| CN202812562U (en) * | 2012-09-29 | 2013-03-20 | 北京航天星汉科技有限公司 | Self-adjusting type machine end face sealed water hinge |
| CN206398087U (en) * | 2016-12-31 | 2017-08-11 | 宁波伏尔肯陶瓷科技有限公司 | A kind of oil pump mechanical sealing device of silicon carbide |
| CN206571970U (en) * | 2017-03-22 | 2017-10-20 | 山东济炼石化工程有限公司 | A kind of mechanical seal hinders the sealing liquid circulatory system |
| CN107420674A (en) * | 2017-05-31 | 2017-12-01 | 中国工程物理研究院总体工程研究所 | High performance multi-channel water swivel joint |
| CN108240351A (en) * | 2016-12-23 | 2018-07-03 | 南京金能新型材料制造厂 | Packaging type cools down anhydrous mechanical seal certainly |
| CN109000062A (en) * | 2018-09-06 | 2018-12-14 | 中国电子科技集团公司第三十八研究所 | A kind of binary channels liquid in rotation joint |
| CN210372013U (en) * | 2019-06-06 | 2020-04-21 | 密友集团有限公司 | Mechanical sealing device suitable for multiple working conditions |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1104896A (en) * | 1965-12-21 | 1968-03-06 | Robert Martin Voitik | Fluid seal |
| US3888495A (en) * | 1972-06-09 | 1975-06-10 | Ehrhard Mayer | Dual-cooled slide ring seal |
| JPH10159714A (en) * | 1996-12-03 | 1998-06-16 | Keihin Corp | Swash plate type pump |
| CN201547429U (en) * | 2009-11-13 | 2010-08-11 | 四川日机密封件股份有限公司 | Double-channel rotatable water joint device |
| CN202493825U (en) * | 2012-03-21 | 2012-10-17 | 北京航天星汉科技有限公司 | Flexible sealing water joint |
| CN202710746U (en) * | 2012-03-21 | 2013-01-30 | 北京航天星汉科技有限公司 | Water hinge sealed by machinery end face |
| CN202812562U (en) * | 2012-09-29 | 2013-03-20 | 北京航天星汉科技有限公司 | Self-adjusting type machine end face sealed water hinge |
| CN108240351A (en) * | 2016-12-23 | 2018-07-03 | 南京金能新型材料制造厂 | Packaging type cools down anhydrous mechanical seal certainly |
| CN206398087U (en) * | 2016-12-31 | 2017-08-11 | 宁波伏尔肯陶瓷科技有限公司 | A kind of oil pump mechanical sealing device of silicon carbide |
| CN206571970U (en) * | 2017-03-22 | 2017-10-20 | 山东济炼石化工程有限公司 | A kind of mechanical seal hinders the sealing liquid circulatory system |
| CN107420674A (en) * | 2017-05-31 | 2017-12-01 | 中国工程物理研究院总体工程研究所 | High performance multi-channel water swivel joint |
| CN109000062A (en) * | 2018-09-06 | 2018-12-14 | 中国电子科技集团公司第三十八研究所 | A kind of binary channels liquid in rotation joint |
| CN210372013U (en) * | 2019-06-06 | 2020-04-21 | 密友集团有限公司 | Mechanical sealing device suitable for multiple working conditions |
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| CN111677871A (en) | 2020-09-18 |
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