CN102536304A - High-pressure rotating sealed water delivery device - Google Patents
High-pressure rotating sealed water delivery device Download PDFInfo
- Publication number
- CN102536304A CN102536304A CN2012100393694A CN201210039369A CN102536304A CN 102536304 A CN102536304 A CN 102536304A CN 2012100393694 A CN2012100393694 A CN 2012100393694A CN 201210039369 A CN201210039369 A CN 201210039369A CN 102536304 A CN102536304 A CN 102536304A
- Authority
- CN
- China
- Prior art keywords
- water delivery
- high pressure
- delivery apparatus
- ring
- sealing
- Prior art date
- 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.)
- Pending
Links
Images
Landscapes
- Joints Allowing Movement (AREA)
Abstract
The invention discloses a high-pressure rotating sealed water delivery device. A moving ring assembled on a drill stem joint connected onto a shell is used as a rotating part, a fixed ring mounted on a spindle via an anti-rotating stop pin is used as a fixed part, and the moving ring, the fixed ring, an auxiliary O-shaped sealing ring, a compensation spring, a bearing, an end cap and the like form the high-pressure rotating sealed water delivery device. Under elastic force of the compensation spring and a guiding effect of the anti-rotating stop pin, fitting end surfaces of the moving ring and the fixed ring mounted on the spindle are axially compacted, so that a rotating sealing friction pair is formed. Under a matching effect of axial pressure of sealed high-pressure water to a right end surface of the fixed ring and sealing of the auxiliary O-shaped sealing ring, the high-pressure water only can axially flow through the fixed ring and the moving ring successively, and continuous delivery of the high-pressure water is realized in the rotating part. A mechanical sealing technical principle is adopted, process requirements of low leakage quantity and friction resistance and long service life are met, relative rotation between the rotating part and the fixed part is realized by the aid of the bearing, and the internal structure of the water delivery device cannot be 'jammed' assuredly forever when the water delivery device runs at high speed.
Description
Technical field
The present invention relates to a kind of connector, be specifically related to a kind of rational in infrastructure, high pressure rotary sealing water delivery apparatus that operational effect is good, belong to field of fluid machinery.
Background technology
Since the seventies in 20th century, along with the development of water-jet technology, this technology extensively is incorporated among the pit mining produced on-site equipment of colliery, to reach the purpose that improves production efficiency and disaster prevention accident.Like disclosed a kind of coal bed gas drainage method of Chinese patent CN100485163C and device; The disclosed a kind of device that creeps into the profound gas pumping of weak seam hole along layer of CN201826748U etc.; Water-jet technology is introduced gas discharge in mine boring equipment, and the pit mining scene has obtained good effect in the colliery.Be one of key technology that realizes above-mentioned water-jet technology The field up to the water under high pressure of tens MPas by the safe and reliable rotary drilling-head that flows to of pressure piping how with pressure.The rotation water delivery apparatus is a kind of equipment of realizing that fluid transmits between rotary connector; This equipment provides a kind of fluid that directly lets get into the inner transition passage of rotary body; One end can rotate with rotary body; Other end transfixion (being communicated with conveying equipment for fluid substances) is like the disclosed swivel joint that is used for high pressure and high relative rotation speed of Chinese patent CN1194685A, the disclosed dynamic sealing swivel coupling of CN1356490A; The disclosed swivel joints of CN1142578A etc. all provide a kind of rotatory sealing joint that in the different application occasion, is used for carrying between rotary connector fluid.
But for the rotation water delivery apparatus commonly used in the high-pressure water jet work progress under the present coal mine, above-mentioned swivel joint exists mostly that sealing load is low, working speed is low, application life is short, complex structure, internal construction are prone to " locking " difficult problem.Therefore, develop a kind of high pressure, at a high speed, long-lived, simple in structure, the high pressure rotary sealing water delivery apparatus that can prevent " locking ", aspects such as high pressure water jet and coal mine downhole safety production are had important practical significance.
Summary of the invention
The present invention is intended to overcome the shortcoming of prior art, provides a kind of water under high pressure of can realizing between the high speed rotary connector, to continue transmission, and is simple in structure, never the long-lived rotatory sealing water delivery apparatus of " locking ".
High pressure rotary sealing water delivery apparatus of the present invention; Its by the rotating ring that assembles in the tool joint that is connected on the shell as revolving part; By being installed in stationary ring on the main shaft through the anti-rotation latch, in the cooperation of parts such as corresponding auxiliary O RunddichtringO, counterbalance spring, bearing, end cap formation down as static element.
In the said high pressure rotary sealing water delivery apparatus, the assembling rotating ring is as revolving part in tool joint.On main shaft, stationary ring is installed as static element through the anti-rotation latch, the right-hand member of stationary ring is installed in the counterbore of main shaft left end through O type circle hermetically, is pushed down by counterbalance spring; Left end cooperates with rotating ring; Under the guide effect of the elastic force of counterbalance spring and anti-rotation latch, the counterface of stationary ring and rotating ring is compressed vertically, form the rotatory sealing friction pair; Realize that transmission medium is in the sealing radially of contact end face; Under by the pressure and auxiliary O RunddichtringO sealing function cooperation of sealed high pressure water, make water under high pressure realize the lasting transmission of water under high pressure between revolving part vertically successively through stationary ring and rotating ring to the stationary ring right side.
Said stationary ring has a fit clearance (about 1mm) through be installed in the left end of main shaft along two anti-rotation latch of main shaft circumferencial direction symmetric arrangement between both ends of the surface, in order to compensation processing and rigging error, guarantee the good contact of rotatory sealing friction pair.Simultaneously, auxiliary O RunddichtringO is installed on the said stationary ring, this O RunddichtringO guarantees that said stationary ring can be installed in the counterbore of main shaft left end hermetically.In addition; The annulus area of said stationary ring right side with and the contact area of left side and rotating ring all have an optimal value; The Theoretical Calculation during by design provides according to on-the-spot service condition (like sealing medium characteristic, sealing load etc.) for this value, and through the finished product detection validation of dispatching from the factory.
Said rotating ring is installed in the right-hand member of tool joint through interference fit, rotates with tool joint and shell in the course of work.
Said stationary ring and rotating ring are respectively by the unlike material made; Wherein select softwood material (like tin bronze) for use for one; Another part is selected hard material material (like stainless steel) for use, and concrete matching method is selected according to on-the-spot service condition (like sealing medium characteristic, sealing load, working life etc.).
The guiding of said counterbalance spring is used to install the counterbore hole wall completion of stationary ring by the main shaft left end; There is an optimal value in pre compressed magnitude during its assembling; The Theoretical Calculation during by design provides according to on-the-spot service condition (like sealing medium characteristic, sealing load etc.) for this value, and through the finished product detection validation of dispatching from the factory.
Said shell is axially fixed on the main shaft by means of two bearings, can guarantee revolving part and static element axiality, realizes water delivery apparatus internal construction never " locking " when running up.
Have at least one leak in the said tool joint, get rid of the micro-leakage medium that water delivery apparatus allows in course of normal operation, guarantee water delivery apparatus being perfectly safe under hermetically-sealed construction catastrophic failure situation simultaneously.
The invention has the beneficial effects as follows:
Adopt the mechanical sealing technology principle, reached that leakage rate is few, frictional resistance is little and the technological requirement of long service life.
Adopt bearing to realize the relative motion between revolving part and the static element, can realize water delivery apparatus internal construction never " locking " under the condition of running up.
Have simple and reasonable, operate steadily reliably, advantage for ease of maintenaince, satisfied of the technical requirements of mining industry to mining high-voltage rotatory sealing water delivery apparatus.
Description of drawings
Fig. 1. be longitudinal sectional drawing through high pressure rotary sealing water delivery apparatus according to the invention;
Fig. 2. be longitudinal sectional drawing through tool joint according to the invention;
Fig. 3. be longitudinal sectional drawing through main shaft according to the invention;
Fig. 4. be the equipment connection layout that utilizes a specific embodiment of high pressure rotary sealing water delivery apparatus according to the invention.
Among Fig. 1 to Fig. 4: 1-tool joint; 2-rotating ring; 3-spring shim; 4,14-oil sealing; 5,10-screw; 6-locking nut; 7-external bushing; 8-neck bush; 9-shaft block ring; 11-back-up ring; 12-main shaft; 13-union; 15-end cap; 16-bearing; 17-shell; 18-counterbalance spring; 19-stationary ring; 20-auxiliary O RunddichtringO; 21-anti-rotation latch; 22-counterbore; 23-leak; 24-water tank; 25-overflow valve; 26-high-pressure hydraulic pump; 27,29-stop valve; 28-abrasive can; 30-high-pressure rubber pipe; 31-high pressure rotary sealing water delivery apparatus; 32-hydraulic drill rig; 33-high pressure sealing drilling rod; 34-drill bit; 35-coal seam; 36-threephase asynchronous; 37-anti-shock pressure meter; 38-choke valve; 39-mixing chamber.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Referring to Fig. 1; High pressure rotary sealing water delivery apparatus of the present invention; Its by in the tool joint 1 that is connected on the shell 11 assembling rotating ring 2 as revolving part; By being installed in stationary ring 19 on the main shaft 12 through anti-rotation latch 21, in the cooperation of corresponding auxiliary O RunddichtringO 20, counterbalance spring 18, bearing 16, end cap 15, oil sealing 14, locking nut 6, shaft block ring 9, neck bush 8, external bushing 7, back-up ring 11, union 13, screw 3,10 formation down as static element.
Referring to Fig. 1; In the high pressure rotary sealing water delivery apparatus, be installed in stationary ring 19 on the main shaft 12 under the guide effect of the elastic force of counterbalance spring 18 and anti-rotation latch 21, the counterface of stationary ring 19 and rotating ring 2 is compressed vertically; Form the rotatory sealing friction pair; Reach under the sealing function of auxiliary O RunddichtringO 20 in the axial compression of sealed high pressure water, make water under high pressure realize the lasting transmission of water under high pressure between revolving part vertically successively through stationary ring 19 and rotating ring 2 to stationary ring 19 right sides.
Referring to Fig. 1 and Fig. 2; Stationary ring 19 is through being installed in the left end of main shaft 12 along two anti-rotation latch 21 of main shaft 12 circumferencial direction symmetric arrangement; One fit clearance (about 1mm) is arranged between both ends of the surface,, guarantee the good contact of rotatory sealing friction pair in order to compensation processing and rigging error; Simultaneously, auxiliary O RunddichtringO 20 is installed on the said stationary ring 19, this O type circle guarantees that said stationary ring 19 can be installed in the counterbore 22 of main shaft 12 left ends hermetically; In addition; The annulus area of said stationary ring 19 right sides with and the contact area of left side and rotating ring 2 all have an optimal value; The Theoretical Calculation during by design provides according to on-the-spot service condition (like sealing medium characteristic, sealing load etc.) for this value, and through the finished product detection validation of dispatching from the factory.
Referring to Fig. 1, rotating ring 2 is installed in the right-hand member of tool joint 1 through interference fit, in the course of work with tool joint 1 and shell 17 rotations.
Referring to Fig. 1; Stationary ring 19 and rotating ring 2 are respectively by the unlike material made; Wherein select softwood material (like tin bronze) for use for one; Another part is selected hard material material (like stainless steel) for use, and concrete matching method is selected according to on-the-spot service condition (like sealing medium characteristic, sealing load, working life etc.).
Referring to Fig. 1, under the guide effect of the elastic force of said counterbalance spring 18 and anti-rotation latch 21, the counterface of stationary ring 19 and rotating ring 2 in axial compression, is formed the rotatory sealing friction pair, realize that transmission medium is in the sealing radially of contact end face.
Referring to Fig. 1 and Fig. 2; The guiding of counterbalance spring 18 is to be accomplished by the hole wall that main shaft 12 left ends are used to install the counterbore 22 of stationary ring 19; There is an optimal value in pre compressed magnitude during its assembling; The Theoretical Calculation during by design provides according to on-the-spot service condition (like sealing medium characteristic, sealing load etc.) for this value, and through the finished product detection validation of dispatching from the factory.
Referring to Fig. 1, shell 17 is axially fixed on the main shaft 12 by means of two bearings 16, can guarantee the axiality of revolving part and static element, realizes water delivery apparatus internal construction never " locking " when running up.
Referring to Fig. 3, have at least one leak 23 in the tool joint 1, get rid of the micro-leakage medium that water delivery apparatus allows in course of normal operation, guarantee water delivery apparatus being perfectly safe under hermetically-sealed construction catastrophic failure situation simultaneously.
Providing certain colliery below in conjunction with accompanying drawing utilizes high pressure rotary sealing water delivery apparatus according to the invention to realize the instance that water under high pressure transmits between two rotary connectors.
Be a kind of coal bed gas drainage method that high pressure rotary sealing water delivery apparatus according to the invention is used for Chinese patent CN100485163C bulletin and the system equipment connection layout that installs as shown in Figure 4, its detailed operation principle and practical implementation step are referring to Chinese patent CN100485163C.
Referring to Fig. 1 and Fig. 4; High pressure rotary sealing water delivery apparatus 31 according to the invention is connected in the whole system through high-pressure rubber pipe 30 and high pressure sealing drilling rod 33; Wherein, High-pressure rubber pipe 30 is connected with the union 13 of high pressure rotary sealing water delivery apparatus 31 according to the invention, and high pressure sealing drilling rod 32 is connected with the tool joint 1 of high pressure rotary sealing water delivery apparatus 31 according to the invention.In system's running; The stationary ring 19 that is rigidly connected in the main shaft 12 on the union 13 and is installed on it is as static element; Together keep static relatively with high-pressure rubber pipe 30; And be rigidly connected in the tool joint 1 on the shell 17 and the rotating ring 2 that is installed on it as revolving part, under the drive of the high pressure sealing drilling rod 33 that drives by hydraulic drill rig 32,, so just can realize the lasting transmission of water under high pressure between two relative revolving parts with the desired speed rotation.
Show through test application: the said high pressure rotary sealing water delivery apparatus of patent of the present invention can finely satisfy system's operation continues conveying to water under high pressure requirement.
Except that the foregoing description, the present invention can also have other embodiment.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all fall into the protection domain of requirement of the present invention.
Claims (9)
1. a high pressure rotary sealing water delivery apparatus comprises shell (17), tool joint (1) and main shaft (12), and said tool joint (1) is fixedly connected on shell (17) front end, it is characterized in that:
Said shell (17) is axially fixed on the main shaft (12) through bearing (16);
Go up assembling rotating ring (2) as revolving part in said tool joint (1);
Go up through anti-rotation latch (21) installation stationary ring (19) as static element at main shaft (12); Stationary ring (19) right-hand member is installed in the counterbore (22) of main shaft (12) left end hermetically through O type circle; Pushed down by counterbalance spring (18), left end cooperates with rotating ring (2), under the guide effect of the elastic force of counterbalance spring (18) and anti-rotation latch (21); The counterface of stationary ring (19) and rotating ring (2) is compressed vertically; Formation rotatory sealing friction pair is realized transmission medium in the sealing radially of contact end face, is being reached under the sealing function cooperation of auxiliary O RunddichtringO (20) by the pressure effect of sealed high pressure water to stationary ring (19) right side; Make water under high pressure realize the lasting transmission of water under high pressure between revolving part vertically successively through stationary ring (19) and rotating ring (2).
2. high pressure rotary sealing water delivery apparatus according to claim 1; It is characterized in that: said stationary ring (19) is installed in the left end of main shaft (12) through two the anti-rotation latch (21) along main shaft (12) circumferencial direction symmetric arrangement, and between main shaft (12) left side one fit clearance is arranged.
3. high pressure rotary sealing water delivery apparatus according to claim 2 is characterized in that: said fit clearance is 1mm.
4. high pressure rotary sealing water delivery apparatus according to claim 1 is characterized in that: said rotating ring (2) is installed in the right-hand member of tool joint (1) through interference fit.
5. high pressure rotary sealing water delivery apparatus according to claim 1 is characterized in that: the right-hand member of said counterbalance spring (18) and stationary ring (19) all is installed in the counterbore (22) of main shaft (12) left end.
6. according to each described high pressure rotary sealing water delivery apparatus of claim 1-5, it is characterized in that: said stationary ring (19) and rotating ring (2) are respectively by the unlike material made.
7. high pressure rotary sealing water delivery apparatus according to claim 6; It is characterized in that: the annulus area of said stationary ring (19) right side with and the contact area of left side and rotating ring (2) by the sealing load decision of said water delivery apparatus, calculate and experiment draws through theory according to the mechanical rotary seal principle.
8. high pressure rotary sealing water delivery apparatus according to claim 6 is characterized in that: the pre compressed magnitude of said counterbalance spring (18) is drawn through theory calculating and experiment according to the mechanical rotary seal principle by the initial sealing pressure decision of said water delivery apparatus.
9. high pressure rotary sealing water delivery apparatus according to claim 6 is characterized in that: be provided with a leak (23) in the said tool joint (1) at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100393694A CN102536304A (en) | 2012-02-21 | 2012-02-21 | High-pressure rotating sealed water delivery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100393694A CN102536304A (en) | 2012-02-21 | 2012-02-21 | High-pressure rotating sealed water delivery device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102536304A true CN102536304A (en) | 2012-07-04 |
Family
ID=46344177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100393694A Pending CN102536304A (en) | 2012-02-21 | 2012-02-21 | High-pressure rotating sealed water delivery device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102536304A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295248A (en) * | 2014-09-18 | 2015-01-21 | 平顶山市安泰华矿用安全设备制造有限公司 | Drill pipe water supply device |
| CN106194048A (en) * | 2016-08-29 | 2016-12-07 | 王国良 | Conduct electricity quiet dynamic conversion attachment means |
| CN107283325A (en) * | 2017-06-09 | 2017-10-24 | 中国铁建重工集团有限公司 | It is a kind of to be used to convey the swivel joint containing solid abrasive two phase flow |
| CN108750057A (en) * | 2018-06-28 | 2018-11-06 | 中国船舶重工集团公司第七0四研究所 | The distance-adjustable oar hub of double-crank transmission |
| CN109236176A (en) * | 2018-11-23 | 2019-01-18 | 湖南湘江水力环保设备科技有限公司 | high-pressure water jet rock drilling machine |
| CN109733578A (en) * | 2019-03-12 | 2019-05-10 | 中国船舶重工集团公司第七0四研究所 | High-power, large scale distance-adjustable oar hub |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4565410A (en) * | 1982-12-18 | 1986-01-21 | Gebr. Eickhoff Maschinenfabrik Und Eisengiesserei Mbh | Apparatus for controlling the supply of high-pressure liquid to a cutter drum assembly |
| GB2172364A (en) * | 1985-03-15 | 1986-09-17 | West & Son | Fluid coupling |
| CN2081928U (en) * | 1991-01-08 | 1991-07-31 | 冶金工业部自动化研究院 | Rotating joint for fluid |
| CN2141488Y (en) * | 1992-09-22 | 1993-09-01 | 杭州碱泵厂 | Built-in forced refrigerating mechanic sealing |
| CN2256964Y (en) * | 1996-04-11 | 1997-06-25 | 张家港市机械密封件厂 | Single-spring rotation type mechanical sealing device |
| CN101117893A (en) * | 2007-09-07 | 2008-02-06 | 重庆大学 | Coal bed gas drainage method and device |
| CN201129315Y (en) * | 2007-12-10 | 2008-10-08 | 大庆市顺达石油设备制造有限公司 | Ultra-high pressure anti-scaling mechanical sealing device |
| CN101806203A (en) * | 2010-03-31 | 2010-08-18 | 重庆大学 | High-pressure hydraulic rotary plug-removing device |
-
2012
- 2012-02-21 CN CN2012100393694A patent/CN102536304A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4565410A (en) * | 1982-12-18 | 1986-01-21 | Gebr. Eickhoff Maschinenfabrik Und Eisengiesserei Mbh | Apparatus for controlling the supply of high-pressure liquid to a cutter drum assembly |
| GB2172364A (en) * | 1985-03-15 | 1986-09-17 | West & Son | Fluid coupling |
| CN2081928U (en) * | 1991-01-08 | 1991-07-31 | 冶金工业部自动化研究院 | Rotating joint for fluid |
| CN2141488Y (en) * | 1992-09-22 | 1993-09-01 | 杭州碱泵厂 | Built-in forced refrigerating mechanic sealing |
| CN2256964Y (en) * | 1996-04-11 | 1997-06-25 | 张家港市机械密封件厂 | Single-spring rotation type mechanical sealing device |
| CN101117893A (en) * | 2007-09-07 | 2008-02-06 | 重庆大学 | Coal bed gas drainage method and device |
| CN201129315Y (en) * | 2007-12-10 | 2008-10-08 | 大庆市顺达石油设备制造有限公司 | Ultra-high pressure anti-scaling mechanical sealing device |
| CN101806203A (en) * | 2010-03-31 | 2010-08-18 | 重庆大学 | High-pressure hydraulic rotary plug-removing device |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295248A (en) * | 2014-09-18 | 2015-01-21 | 平顶山市安泰华矿用安全设备制造有限公司 | Drill pipe water supply device |
| CN106194048A (en) * | 2016-08-29 | 2016-12-07 | 王国良 | Conduct electricity quiet dynamic conversion attachment means |
| CN107283325A (en) * | 2017-06-09 | 2017-10-24 | 中国铁建重工集团有限公司 | It is a kind of to be used to convey the swivel joint containing solid abrasive two phase flow |
| CN108750057A (en) * | 2018-06-28 | 2018-11-06 | 中国船舶重工集团公司第七0四研究所 | The distance-adjustable oar hub of double-crank transmission |
| CN109236176A (en) * | 2018-11-23 | 2019-01-18 | 湖南湘江水力环保设备科技有限公司 | high-pressure water jet rock drilling machine |
| CN109236176B (en) * | 2018-11-23 | 2023-12-15 | 湖南湘江水力环保设备科技有限公司 | High-pressure water jet rock drilling machine |
| CN109733578A (en) * | 2019-03-12 | 2019-05-10 | 中国船舶重工集团公司第七0四研究所 | High-power, large scale distance-adjustable oar hub |
| CN109733578B (en) * | 2019-03-12 | 2024-03-22 | 中国船舶重工集团公司第七0四研究所 | High-power and large-size adjustable pitch propeller hub |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102536304A (en) | High-pressure rotating sealed water delivery device | |
| CN102410381A (en) | Bidirectional hard seal ball valve for coal chemical industry | |
| US8899314B2 (en) | Stuffing box | |
| RU50590U1 (en) | ANTI-EMISSION ORIENTAL OIL SEAL | |
| CN105386737A (en) | Blowout preventing hole opener for casing pipe | |
| CN113374436A (en) | Anticorrosion gas production wellhead assembly | |
| CN204113106U (en) | Washing pipe assembly and top drive drilling system are driven in mechanical seal top | |
| CN106089085A (en) | A kind of machinery vertical drilling tool | |
| CN101696729B (en) | Combined sealing structure of combined sealing device and steering drilling tool | |
| CN105570580B (en) | A kind of pair of medium chicksan | |
| US7926559B2 (en) | Oilfield stuffing box | |
| CN101403456B (en) | High-pressure high-rotation speed rotary connector | |
| CN114635662B (en) | Rotary blowout preventer capable of monitoring rubber core state and preventing drilling fluid from overflowing and system | |
| CN114635663B (en) | Closed-loop control method of rotary blowout preventer | |
| CN202125283U (en) | High-pressure filling type rotary sliding well head | |
| CN202188153U (en) | Bidirectional hard-seal fixed-type ball valve used in coal chemical industry | |
| CN111577192B (en) | Orifice pressure-bearing sealing device for underground coal mine water prevention and control composite directional drilling | |
| CN201277164Y (en) | Oil-draining lubricator type oil pump | |
| RU2527054C1 (en) | Spherical circular rotary preventer | |
| RU191857U1 (en) | High reliability ring preventer | |
| CN202926254U (en) | Cardan joint for rotary drilling rig | |
| CN202900073U (en) | High-inclination well hollow sucker rod self-righting device | |
| CN201225401Y (en) | Spiral groove end plane adverse current mechanical sealing device | |
| CN211598523U (en) | Roller bit with single metal seal and rubber seal double seals | |
| CN101238269A (en) | Rod lock for ram blowout preventer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120704 |