CN105822861A - Multi-channel rotary joint applicable to simultaneous transmission of multiple media - Google Patents
Multi-channel rotary joint applicable to simultaneous transmission of multiple media Download PDFInfo
- Publication number
- CN105822861A CN105822861A CN201610263346.XA CN201610263346A CN105822861A CN 105822861 A CN105822861 A CN 105822861A CN 201610263346 A CN201610263346 A CN 201610263346A CN 105822861 A CN105822861 A CN 105822861A
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- CN
- China
- Prior art keywords
- mandrel
- media
- overcoat
- annular
- rotary joint
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
- F16L27/087—Joints with radial fluid passages
Abstract
The invention relates to a multi-channel rotary joint applicable to simultaneous transmission of multiple media. A plurality of spindle media ports are formed in the upper end surface of a spindle and a plurality of annular media grooves are formed in the outer edge of the spindle from top to bottom. Each spindle media port is communicated with at least one annular media groove and all the spindle media ports are separated from each other. The outer edge part of each spindle, above and below each annular media groove, are both provided with a rotary sealing ring. At least one jacket media port is formed in a jacket corresponding to each annular media groove in position and is communicated with the corresponding annular media groove. According to the multi-channel rotary joint provided by the invention, a plurality of jacket media ports can provide media to one spindle media port and transmit multiple types of media simultaneously; high temperature resistant material, high pressure resistant material or common material can be used for the rotary sealing rings located between the spindle and the jackets, so that the sealing property of the transmission of the media is guaranteed; in conclusion, all the structures are combined with each other to form a rotary joint which is provided with multiple channels, capable of transmitting multiple media, good in sealing property, resistant to high temperature and high pressure and long in service life.
Description
Technical field
The invention belongs to swivel joint technical field, a kind of be applicable to the Multi-path rotary joint that multimedium transmits simultaneously.
Background technology
Swivel joint often use two parts relative between exist discontinuously, rotate continuously or in the connection of the action such as swing rotary, two parts can not be followed rotate together with owing to carrying the pipeline of these media, so the structure in swivel joint realizes the actions such as rotation, it is responsible for the pipeline of connection both sides simultaneously.Swivel joint is made up of mandrel and overcoat, and mandrel and overcoat can relatively rotate, and mandrel and the media port put outward can connect exterior line, internal then mandrel with medium runner and put outward the media port of correspondence and couple together.Mandrel and overcoat need according to operating mode all can be as rotor or stator, and the equipment coaxial rotating that rotor must and rotate, the media port on stator is connected with the fixing pipeline of pumped (conveying) medium, and the media port on rotor is connected with the pipeline on rotary part.Existing swivel joint mostly is unipath, single medium transmission, seal form many employings clearance seal, sealing effectiveness is poor, easily leak, service life is low, and need when the equipment for two respective rotary motions supplies to arrange two mandrels, an overcoat it is set with on each mandrel, so will certainly increase the number of devices at scene, cause on-the-spot crowded, cable is too much, in the application scenarios that some mandrel is longer, overcoat is also required to longer length, but precision when long outer being enclosed within processing, use is difficult to ensure that.In sum, be badly in need of a kind of be provided with multi-path and can realize medium carry simultaneously, good seal performance and high pressure resistant, high temperature resistant and the new structure that the equipment with different rotation rates is simultaneously connected with and supplies can be realized between each path.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that rational in infrastructure, good airproof performance, high temperature resistant, high pressure resistant and can be connected with the equipment of multiple different rotation rates a kind of be applicable to the Multi-path rotary joint that multimedium transmits simultaneously.
The present invention adopts the technical scheme that:
A kind of it is applicable to the Multi-path rotary joint that multimedium transmits simultaneously, including mandrel and overcoat, overcoat rotary sleeve is contained in mandrel outer rim, a bearing it is embedded in respectively between the mandrel outer rim of inner edge, overcoat two ends and homonymy, it is characterized in that: make multiple mandrel media port in mandrel upper surface, mandrel outer rim from top to bottom makes multiple annular media slot, each mandrel media port connects between at least one annular media slot and all mandrel media ports mutually isolated, mandrel outer rim above and below each annular media slot is respectively provided with a rotating seal ring, at least one overcoat media port connected with annular media slot at this is made with outer the putting of each annular media slot phase para-position.
And, the mandrel outer rim between two adjacent rotating seal rings makes annular lubricant oil groove, and outer the putting of this annular lubricant oil groove para-position makes at least one oilhole, and at the outer openings of this oilhole, setting-in is for the screw plug sealed.
And, described rotating seal ring is that exotic material is made or high pressure resistant material is made.
And, described mandrel is made at least one through hole from top to bottom.
And, described mandrel bottom arranges mounting flange.
It is a further object to provide and a kind of be applicable to the Multi-path rotary joint that multimedium transmits simultaneously, including mandrel and at least two overcoat, it is characterized in that: the rotary sleeve that multiple overcoats are the most adjacent is contained in mandrel outer rim, rotatable support structure or servo-actuated attachment structure are installed in the gap between two ends that two adjacent overcoats are relative, described rotatable support structure is for making adjacent two overcoat rotate with different rotating speeds, and described servo-actuated attachment structure rotates with same rotational speed for making adjacent two overcoat；
The mandrel outer rim of each overcoat inner edge para-position makes the multiple annular media slot arranged along mandrel axially spaced-apart, mandrel outer rim above and below each annular media slot is respectively provided with a rotating seal ring, each annular outer putting corresponding to media slot makes at least one overcoat media port connected with annular media slot at this, in mandrel, multiple mandrel media port is made in upper surface, one or more overcoat media ports or each mandrel media port in each mandrel media port one overcoat of connection connect the multiple overcoat media ports in multiple overcoats, between each mandrel media port mutually isolated.
And, the mandrel outer rim between two adjacent rotating seal rings makes annular lubricant oil groove, and outer the putting of this annular lubricant oil groove para-position makes at least one oilhole, and at the outer openings of this oilhole, setting-in is for the screw plug sealed.
And, described rotating seal ring is that exotic material is made or high pressure resistant material is made.
And, described mandrel is made at least one through hole from top to bottom.
And, described mandrel bottom arranges mounting flange.
Advantages of the present invention and good effect be:
nullIn the present invention，When mandrel outer rim one overcoat of suit，Each mandrel media port on mandrel is by the one or more annular media slot in medium runner one overcoat of connection，Each corresponding one or more overcoat media ports of annular media slot，Thus achieve multiple overcoat media port and a mandrel media port is interconnected，When the rotation that mandrel outer rim is the most adjacent is set with multiple overcoat，Each mandrel media port connects multiple annular media slot of multiple overcoats by the one or more annular media slot in medium runner one overcoat of connection or each mandrel media port，No matter the quantity of overcoat has how many，Overcoat media port can carry polytype medium by mandrel media port，Each media port、Runner、Medium kind and flow that the size of media slot can carry as required determine，For in different types of medium，Rotating seal ring between mandrel and overcoat is selected high temperature resistant、High pressure resistant or common material，Ensure that the sealing that medium carries，Simultaneously in order to ensure the rotation lubrication between mandrel and overcoat，It is provided with oilhole on outer set between two adjacent rotating seal rings，Operator can regularly add grease，Ensure the stable of work and safety，Additionally，In the structure of multiple overcoats，Two overcoats of rotatable support structure both sides can use different rotating speeds to rotate on mandrel，Two overcoats of servo-actuated attachment structure both sides can use identical rotating speed to rotate on mandrel，The former can make the equipment of the different rotating speeds that a mandrel connected by multiple overcoats provide medium，The latter can make the rotating speed of multiple overcoat identical and constitute a rotary body，Certainly，Rotatable support structure and servo-actuated attachment structure can be used in any combination，Can be so that certain a few overcoat on mandrel provide medium for different rotating speeds equipment，Certain a few overcoat synchronous axial system can also be made and provide medium for same equipment，Avoid defect of the prior art.
Accompanying drawing explanation
Fig. 1 is present invention structural representation when having an overcoat；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is the I portion enlarged drawing of Fig. 1；
Fig. 4 is present invention structural representation when having two overcoats；
Fig. 5 is the top view of Fig. 4.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described, and following embodiment is illustrative, is not determinate, it is impossible to limits protection scope of the present invention with following embodiment.
A kind of it is applicable to the Multi-path rotary joint that multimedium transmits simultaneously, such as Fig. 1, 2, shown in 3, including mandrel 1 and overcoat 13, overcoat rotary sleeve is contained in mandrel outer rim, a bearing 4 it is embedded in respectively between the mandrel outer rim of inner edge, overcoat two ends and homonymy, the innovation of the present invention is: make multiple mandrel media port 15 in mandrel upper surface 3, mandrel outer rim from top to bottom makes multiple annular media slot 10, each mandrel media port connects between at least one annular media slot and all mandrel media ports mutually isolated, mandrel outer rim above and below each annular media slot is respectively provided with a rotating seal ring 8, at least one overcoat media port 11 connected with annular media slot at this is made with outer the putting of each annular media slot phase para-position, 17, 19.
In the present embodiment, mandrel media port is as in figure 2 it is shown, have 12, overcoat media port is as it is shown in figure 1, have 16, i.e. annular media slot has 16, multiple overcoat media ports connect same amount of annular media slot, and having multiple in 16 annular media slot is to connect same mandrel media port.Specifically can be referring to Fig. 3, the overcoat media port of label 17,19 is respectively communicated with a mandrel media port, and label 11 is two overcoat media ports and is respectively communicated with an annular media slot 10, two annular media slot connect a medium runner 7 jointly by two medium tube 9, and medium runner 7 connects a mandrel media port.
Mandrel outer rim between two adjacent rotating seal rings makes annular lubricant oil groove 16, outer the putting of this annular lubricant oil groove para-position makes at least one oilhole 5, at the outer openings of this oilhole, setting-in is for the screw plug 6 sealed, periodically inject grease from oilhole, rotating seal ring is lubricated.
Owing to the parameters such as the kind of medium, character are otherwise varied, so the corresponding rotating seal ring used should use different materials, such as: the overcoat media port of label 17 is used for carrying air, so the rotating seal ring 8 used at this uses common material, the overcoat media port of label 19 is used for carrying high-temperature water, so the rotating seal ring 18 used at this uses exotic material, the overcoat media port of label 11 is for conveying high-pressure oil, so the rotating seal ring 20 used at this uses high pressure resistant material.
In addition to the structures such as above-mentioned media port, runner, also can need the through hole 2 at the centrally disposed any latus rectum of mandrel according to operating mode, quantity can be more than one, and it can be as the passage of cable, pipeline or fluid.Described mandrel bottom arranges mounting flange 14, and it can connect electric slip ring, can realize the transmission of current signal in slewing.
The axle diameter of swivel joint is relevant with the quantity of media port and diameter, number of openings and diameter, it may be assumed that media port quantity is the most, and diameter is the biggest, and through hole is the most, and diameter is the biggest, and axle diameter is the biggest.Swivel joint maximum permissible revolution is relevant with axle diameter, medium temperature and pressure medium, it may be assumed that axle diameter is the biggest, and medium temperature is the highest, and pressure medium is the biggest, and maximum permissible revolution is the lowest.
Some application scenarios there will be following situation: 1. need the multiple equipment for rotating speed is different to provide medium；2. mandrel is longer, and the machining accuracy of single overcoat is difficult to ensure that.So in order to solve this problem, producer develops the structure of multiple overcoat, as seen in figures 3-5, swivel joint includes mandrel 1 and at least two overcoat 13,23, the rotary sleeve that multiple overcoats are the most adjacent is contained in mandrel outer rim, in gap 21 between two ends that two adjacent overcoats are relative, rotatable support structure 22 or servo-actuated attachment structure 22 are installed, described rotatable support structure is for making adjacent two overcoat rotate with different rotating speeds, and described servo-actuated attachment structure rotates with same rotational speed for making adjacent two overcoat.
Bearing 4 it is embedded between inner edge, outer set upper side above and the mandrel outer rim of homonymy, each media port on overcoat and mandrel, annular media slot isostructural self and between the structure that connects identical with the description in the scheme with an overcoat, the structure shown in Fig. 3 also apply be applicable to overcoat 23 with on mandrel matching relationship.
Bearing 26 it is embedded between the inner edge, overcoat lower end and the mandrel outer rim of homonymy of lower section, following overcoat also has overcoat media port 24, annular media slot 27, rotating seal ring 29, oilhole 28, oil-way 30, screw plug 31, medium runner 32, and concrete structure is:
nullMandrel 1 outer rim of overcoat 23 inner edge para-position makes the multiple annular media slot 27 arranged along mandrel axially spaced-apart，Mandrel outer rim above and below each annular media slot is respectively provided with a rotating seal ring 29，Each annular outer putting corresponding to media slot makes at least one overcoat media port 24 connected with annular media slot at this，In mandrel, multiple mandrel media port 33 is made in upper surface、34，One or more overcoat media ports in mandrel media port connection overcoat 13 or mandrel media port connection overcoat 13、Multiple overcoat media ports in 23，Between each mandrel media port mutually isolated，Preferably scheme is: mandrel media port 33 one or more overcoat media ports made with overcoat 13 above connect，Mandrel media port 34 connects with the made one or more overcoat media ports of overcoat 23 being positioned at lower section，Make the through hole 25 that at least one through hole 2 from top to bottom makes with mounting flange 14 on mandrel to connect.
Overcoat is divided into 13 and 23, and when two overcoat rotary speed differences, two overcoats can be respectively relative to each spinning of mandrel and non-interference, can realize a fixed central spindle and provide multi-path multimedium for multiple rotary sleeves and relevant device simultaneously.Rotatable support structure 22 between two overcoats can be the parts that can play rotation supporting role that bearing, thrust washer etc. are common.
When mandrel length is longer, overcoat 13 and 23 is processed respectively, and machining accuracy is ensured, difficulty of processing reduces, and the servo-actuated attachment structure 22 between two overcoats can be that grab, buckle, key block etc. can play two servo-actuated parts of overcoat.
Certainly, rotatable support structure and servo-actuated attachment structure can be used on same longer mandrel simultaneously, such as: four overcoats are set on mandrel, it is positioned at the top and two overcoats under it use servo-actuated attachment structure synchronous axial system, and bottom and two overcoats thereon use rotatable support structure asynchronous rotary, between two middle overcoat adjacent end portions, rotatable support structure is also installed to realize asynchronous rotary, so can connect more equipment on a mandrel, simplify on-the-spot structure, reduce floor space, improve work efficiency.
Swivel joint parameter is as follows:
(1) the quantity of the path that rated pressure: 0～40MPa, media port and runner are constituted: 1～30 tunnels, diameter: Ф 6～300mm
(2) operating temperature :-100～+260 DEG C, operating rate: maximum line velocity 2m/s
(3) working media: the various fluid pressure medium such as gas, liquid, such as: empty gas and water, oil, emulsion, water glycol etc..
Parts machining precision in above-mentioned each structure is high, uses the imported bearing of precision, and driving torque is little, operates steadily.
nullIn the present invention，When mandrel outer rim one overcoat of suit，Each mandrel media port on mandrel is by the one or more annular media slot in medium runner one overcoat of connection，Each corresponding one or more overcoat media ports of annular media slot，Thus achieve multiple overcoat media port and a mandrel media port is interconnected，When the rotation that mandrel outer rim is the most adjacent is set with multiple overcoat，Each mandrel media port connects multiple annular media slot of multiple overcoats by the one or more annular media slot in medium runner one overcoat of connection or each mandrel media port，No matter the quantity of overcoat has how many，Overcoat media port can carry polytype medium by mandrel media port，Each media port、Runner、Medium kind and flow that the size of media slot can carry as required determine，For in different types of medium，Rotating seal ring between mandrel and overcoat is selected high temperature resistant、High pressure resistant or common material，Ensure that the sealing that medium carries，Simultaneously in order to ensure the rotation lubrication between mandrel and overcoat，It is provided with oilhole on outer set between two adjacent rotating seal rings，Operator can regularly add grease，Ensure the stable of work and safety，Additionally，In the structure of multiple overcoats，Two overcoats of rotatable support structure both sides can use different rotating speeds to rotate on mandrel，Two overcoats of servo-actuated attachment structure both sides can use identical rotating speed to rotate on mandrel，The former can make the equipment of the different rotating speeds that a mandrel connected by multiple overcoats provide medium，The latter can make the rotating speed of multiple overcoat identical and constitute a rotary body，Certainly，Rotatable support structure and servo-actuated attachment structure can be used in any combination，Can be so that certain a few overcoat on mandrel provide medium for different rotating speeds equipment，Certain a few overcoat synchronous axial system can also be made and provide medium for same equipment，Avoid defect of the prior art.
Claims (10)
1. one kind is applicable to the Multi-path rotary joint that multimedium transmits simultaneously, including mandrel and overcoat, overcoat rotary sleeve is contained in mandrel outer rim, a bearing it is embedded in respectively between the mandrel outer rim of inner edge, overcoat two ends and homonymy, it is characterized in that: make multiple mandrel media port in mandrel upper surface, mandrel outer rim from top to bottom makes multiple annular media slot, each mandrel media port connects between at least one annular media slot and all mandrel media ports mutually isolated, mandrel outer rim above and below each annular media slot is respectively provided with a rotating seal ring, at least one overcoat media port connected with annular media slot at this is made with outer the putting of each annular media slot phase para-position.
The most according to claim 1 a kind of it is applicable to the Multi-path rotary joint that multimedium transmits simultaneously, it is characterized in that: the mandrel outer rim between two adjacent rotating seal rings makes annular lubricant oil groove, outer the putting of this annular lubricant oil groove para-position makes at least one oilhole, and at the outer openings of this oilhole, setting-in is for the screw plug sealed.
The most according to claim 1 and 2 a kind of it is applicable to the Multi-path rotary joint that multimedium transmits simultaneously, it is characterised in that: described rotating seal ring is that exotic material is made or high pressure resistant material is made.
The most according to claim 3 a kind of it is applicable to the Multi-path rotary joint that multimedium transmits simultaneously, it is characterised in that: make at least one through hole from top to bottom on described mandrel.
5. it is applicable to, according to a kind of described in claim 1 or 2 or 4, the Multi-path rotary joint that multimedium transmits simultaneously, it is characterised in that: described mandrel bottom arranges mounting flange.
6. one kind is applicable to the Multi-path rotary joint that multimedium transmits simultaneously, including mandrel and at least two overcoat, it is characterized in that: the rotary sleeve that multiple overcoats are the most adjacent is contained in mandrel outer rim, rotatable support structure or servo-actuated attachment structure are installed in the gap between two ends that two adjacent overcoats are relative, described rotatable support structure is for making adjacent two overcoat rotate with different rotating speeds, and described servo-actuated attachment structure rotates with same rotational speed for making adjacent two overcoat；
The mandrel outer rim of each overcoat inner edge para-position makes the multiple annular media slot arranged along mandrel axially spaced-apart, mandrel outer rim above and below each annular media slot is respectively provided with a rotating seal ring, each annular outer putting corresponding to media slot makes at least one overcoat media port connected with annular media slot at this, in mandrel, multiple mandrel media port is made in upper surface, one or more overcoat media ports or each mandrel media port in each mandrel media port one overcoat of connection connect the multiple overcoat media ports in multiple overcoats, between each mandrel media port mutually isolated.
The most according to claim 6 a kind of it is applicable to the Multi-path rotary joint that multimedium transmits simultaneously, it is characterized in that: the mandrel outer rim between two adjacent rotating seal rings makes annular lubricant oil groove, outer the putting of this annular lubricant oil groove para-position makes at least one oilhole, and at the outer openings of this oilhole, setting-in is for the screw plug sealed.
8. it is applicable to, according to a kind of described in claim 6 or 7, the Multi-path rotary joint that multimedium transmits simultaneously, it is characterised in that: described rotating seal ring is that exotic material is made or high pressure resistant material is made.
The most according to claim 8 a kind of it is applicable to the Multi-path rotary joint that multimedium transmits simultaneously, it is characterised in that: make at least one through hole from top to bottom on described mandrel.
10. it is applicable to, according to a kind of described in claim 6 or 7 or 9, the Multi-path rotary joint that multimedium transmits simultaneously, it is characterised in that: described mandrel bottom arranges mounting flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610263346.XA CN105822861A (en) | 2016-04-25 | 2016-04-25 | Multi-channel rotary joint applicable to simultaneous transmission of multiple media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610263346.XA CN105822861A (en) | 2016-04-25 | 2016-04-25 | Multi-channel rotary joint applicable to simultaneous transmission of multiple media |
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| Publication Number | Publication Date |
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| CN105822861A true CN105822861A (en) | 2016-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610263346.XA Pending CN105822861A (en) | 2016-04-25 | 2016-04-25 | Multi-channel rotary joint applicable to simultaneous transmission of multiple media |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114151638A (en) * | 2021-10-18 | 2022-03-08 | 太原重工股份有限公司 | Coupling device with medium connecting and disconnecting function |
| CN114382975A (en) * | 2021-12-11 | 2022-04-22 | 首钢京唐钢铁联合有限责任公司 | Multi-medium rotary joint |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000079174A1 (en) * | 1999-06-23 | 2000-12-28 | Framo Engineering As | Swivel apparatus |
| CN201007404Y (en) * | 2007-01-23 | 2008-01-16 | 浙江柏润液压有限公司 | Multipath oil feeding rotary joint |
| CN202733253U (en) * | 2012-07-17 | 2013-02-13 | 江苏博威铸业集团有限公司 | Connector of centrifuge hydraulic driver and oil pipe |
| CN103423540A (en) * | 2012-05-25 | 2013-12-04 | 中国石油天然气集团公司 | Multichannel rotary connector |
| CN205716142U (en) * | 2016-04-25 | 2016-11-23 | 天津优瑞纳斯液压机械有限公司 | A kind of it is applicable to the Multi-path rotary joint that multimedium transmits simultaneously |
-
2016
- 2016-04-25 CN CN201610263346.XA patent/CN105822861A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000079174A1 (en) * | 1999-06-23 | 2000-12-28 | Framo Engineering As | Swivel apparatus |
| CN201007404Y (en) * | 2007-01-23 | 2008-01-16 | 浙江柏润液压有限公司 | Multipath oil feeding rotary joint |
| CN103423540A (en) * | 2012-05-25 | 2013-12-04 | 中国石油天然气集团公司 | Multichannel rotary connector |
| CN202733253U (en) * | 2012-07-17 | 2013-02-13 | 江苏博威铸业集团有限公司 | Connector of centrifuge hydraulic driver and oil pipe |
| CN205716142U (en) * | 2016-04-25 | 2016-11-23 | 天津优瑞纳斯液压机械有限公司 | A kind of it is applicable to the Multi-path rotary joint that multimedium transmits simultaneously |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114151638A (en) * | 2021-10-18 | 2022-03-08 | 太原重工股份有限公司 | Coupling device with medium connecting and disconnecting function |
| CN114382975A (en) * | 2021-12-11 | 2022-04-22 | 首钢京唐钢铁联合有限责任公司 | Multi-medium rotary joint |
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Application publication date: 20160803 |