CN101906935B - Universal shaft of underground motor - Google Patents
Universal shaft of underground motor Download PDFInfo
- Publication number
- CN101906935B CN101906935B CN 201010222871 CN201010222871A CN101906935B CN 101906935 B CN101906935 B CN 101906935B CN 201010222871 CN201010222871 CN 201010222871 CN 201010222871 A CN201010222871 A CN 201010222871A CN 101906935 B CN101906935 B CN 101906935B
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- cardan
- mandrel
- feather key
- spherical
- oil sealing
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Abstract
The invention discloses a universal shaft of an underground motor, which comprises an upper universal joint, a spindle and a lower universal joint, which are arranged in a universal shaft housing, wherein the upper universal joint and the lower universal joint are arranged on two ends of the spindle respectively, the upper universal joint and the lower universal joint are contacted with the spindle through a spherical convex pieces respectively and both the upper and lower ends of the spindle are provided with a semi-spherical stop key which provided with a spherical sleeve; the periphery of the spindle is provided with a corrugated oil seal which is connected with the upper and lower universal joints, and the spherical surface of the corrugated oil seal is contacted with the spherical surface of the spherical sleeve; and the spindle is provided with a sphere ejecting pin surface sliding key which is in sliding key fit with the spindle, the upper universal joint and the lower universal joint. The universal joint has a simple and compact structure, flexible and reliable use, full functions, long service life, large transmission torque and wide application range, and is applicable to large-torque and low-rotation speed motors required for current drilling.
Description
Technical field
The present invention relates to a kind of oil gas field drilling equipment, relate in particular to a kind of universal shaft of underground motor.
Background technology
In the oil gas field drilling process, need to come broken formation with a kind of power drive bit, realize drilling well; Down-hole motor is exactly this take drilling fluid as power, can transfer fluid pressure to the positive displacement mud motor of mechanical energy.The slurry flows that pumps when slush pump enters motor through bypass valve, forms certain pressure differential at the import and export of motor, and drive rotor is around the axis rotation of stator, and rotating speed and moment of torsion are passed to drill bit by universal drive shaft and power transmission shaft, thereby realizes drillng operation.
Because the rotor of motor is eccentric, rotor produces the rotation around self center line when rotating in stator, can around the revolution of stator center line under the effect of eccentric throw, rotating speed be refused to be delivered to drill bit with turning round again; In transmittance process, jiggly eccentric rotary of rotor need to be delivered to the concentric smooth rotation of power transmission shaft, this process is just realized by universal drive shaft.
What at present, the motor universal drive shaft of domestic use adopted is petal type and ball-joint formula; The petal type processing technology is complicated, rubbing surface is unlubricated, so application life is short, can't satisfy rising turn round greatly the requirement of refusing slow-speed of revolution down-hole motor; Although ball-joint formula universal drive shaft has oil lubrication, transmit and to turn round the contact surface of refusing and belong to the line contact, same application life is short, can't satisfy rising turn round greatly the requirement of refusing slow-speed of revolution down-hole motor.
Summary of the invention
Goal of the invention: for the deficiencies in the prior art, the purpose of this invention is to provide a kind of universal shaft of underground motor, with satisfy turn round greatly refuse, slow-revving user demand.
Technical scheme: in order to realize the foregoing invention purpose, the technical solution used in the present invention is:
A kind of universal shaft of underground motor, comprise the upper cardan, mandrel and the lower cardan that are arranged in the universal shaft housing, described upper cardan and lower cardan are separately positioned on the two ends of mandrel, described upper cardan contacts with mandrel by spherical jacking block respectively with lower cardan, be equipped with the semicircle block key in two ends up and down at mandrel, be provided with spherical cover at the semicircle block key; Periphery at mandrel is provided with corrugated oil sealing, and corrugated oil sealing is connected with lower cardan with upper cardan, and the spherical of corrugated oil sealing contacts with the sphere of spherical cover; Be provided with ball fore-set face feather key at mandrel, described ball fore-set face feather key forms feather key with mandrel, upper cardan and lower cardan and cooperates.
Described ball fore-set face feather key comprises cylinder, and at the cylinder side of being provided with plate, the top of described side's plate is sphere.
Described feather key cooperates: the cylinder of ball fore-set face feather key is arranged in the cylindrical hole corresponding on the mandrel, can rotate in cylindrical hole corresponding to mandrel; The square plate of ball fore-set face feather key is arranged on upper cardan or keyway corresponding to lower cardan, the keyway root cylindrical surface that the sphere of ball fore-set face feather key is corresponding with upper cardan or lower cardan matches, and the face of cylinder of the keyway root that upper cardan or lower cardan are corresponding can be rotated at ball fore-set face feather key top sphere with the same center of circle along ball fore-set face feather key top sphere.
Be provided with 4 to 8 groups of ball fore-set face feather keys at the two ends of described mandrel.
Be equipped with floating plug at described upper cardan and lower cardan, be provided with O-ring seals between corrugated oil sealing and mandrel, described floating plug and O-ring seals are used up and down 2 annular seal spaces of rear formation universal drive shaft, are provided with lubricating grease in the sealing chamber.
Be equipped with the mobile cavity of floating plug at described upper cardan and lower cardan.
Described corrugated oil sealing is 2, and an end of described corrugated oil sealing is fixed end, and the other end is free end, and described fixed end is connected with upper cardan or lower cardan by screw thread; Described free end moves up and down at mandrel.
Described corrugated oil sealing comprises seal nipple, O type circle, pressure ring, packing element and lower seal joint; Upper seal nipple top is spherical, matches with the spherical of sphere cover, is provided with screw thread at upper seal nipple and matches with the internal thread of upper cardan or lower cardan; Described O type circle seals up corrugated oil sealing and upper cardan or lower cardan; Upper seal nipple and lower seal joint are fixedly installed on the two ends of packing element by pressure ring.
Universal drive shaft is the eccentric rotary with motor rotor, is delivered to the with one heart steadily rotation of power transmission shaft, is transmitting simultaneously huge turning round and is refusing drill bit and come fractured rock; In eccentric rotary being transformed into this process of steady rotation, universal drive shaft up and down two universal joints is finished this work, whole operating principle is: upper cardan is delivered to lower cardan with the eccentric rotary of rotor by the universal drive shaft mandrel, after be delivered to again power transmission shaft and produce steadily rotation; Up and down two universal joints transmission turn round refuse and rotating speed in, outside rotating with mandrel, also bob and weave at mandrel, eliminated the eccentric impact that brings, realized universal function; Universal drive shaft of the present invention up and down two universal joints has oil lubrication when mandrel is bobbed and woven, so that the movement parts in the universal drive shaft flexibly, has reliably greatly reduced wearing and tearing, prolonged application life.
Beneficial effect: universal shaft of underground motor of the present invention, in whole down-hole motor, play a part to form a connecting link, its flexibility and project organization directly affect whole down-hole motor transmission and turn round and refuse and the size of rotating speed, and the intensity of motor rotor and power transmission shaft, be related to application life of whole down-hole motor.The universal shaft of underground motor of this invention, simple in structure, compact, use flexible, reliable, multiple functional, long service life, transmission to turn round and refuse the advantages such as large, it is the substitute of Petal type cardan axle, have higher than ball-joint formula universal drive shaft intensity, transmit to turn round and refuse large, structure than simple characteristics, be suitable for current drilling well required turn round greatly refuse, slow-speed of revolution down-hole motor.
Use down-hole motor and can realize the drilling well of diameter, inclined shaft, extended reach well, horizontal well, Multilateral Wells, fishbone well, improve in the volume increase of oily company and store up; Reduce land occupation, be conducive to protection of the environment, shorten and see the well cycle, stop or the generation of minimizing accident; Be conducive to few input, fecund goes out, and has reduced greatly development cost.It is supporting that universal drive shaft of the present invention is suitable for the down-hole motor of 100,165,172,197,244 outside dimensions, and the down-hole motor of above-mentioned outside dimension has been included the required scope of application of drilling well substantially.
Description of drawings
Fig. 1 is the structural representation of down-hole motor.
Fig. 2 is the structural representation of universal shaft of underground motor.
Fig. 3 is the structural representation of corrugated oil sealing.
The structural representation of Fig. 4 ball fore-set face feather key.
Fig. 5 is that the B-B of Fig. 3 is to sectional view.
Fig. 6 is that the A of Fig. 3 is to view.
The specific embodiment
The present invention will be further explained below in conjunction with accompanying drawing.
As shown in Figure 1, be the down-hole motor structure.Down-hole motor comprises motor part 1, universal drive shaft part 4 and power transmission shaft part 5.Motor part 1 comprises motor stator 2 and the motor rotor 3 that is arranged in the motor stator 2.Power transmission shaft part 5 comprises power transmission shaft 6 and the power transmission shaft shell 7 that is arranged on outside the power transmission shaft 6.Universal drive shaft 4 shells upper end links to each other with motor stator 2, and universal drive shaft 4 shell lower ends link to each other with power transmission shaft shell 7; Universal drive shaft 4 upper ends link to each other with motor rotor 3, and universal drive shaft 4 lower ends link to each other with power transmission shaft 6.
As shown in Figure 2, be the structure of universal drive shaft.Universal drive shaft comprises floating plug 8, spherical jacking block 9, upper cardan 10, ball fore-set face feather key 11, semicircle block key 12, spherical cover 13, corrugated oil sealing 14, mandrel 15, lower cardan 16 and shell 17.
Existing universal drive shaft adopts 4 to 6 steel balls to transmit rotating speed and turn round and refuses between universal joint and mandrel; Half is sitting in steel ball in the mandrel, and second half contacts to transmit to turn round with the universal joint half slot and refuses, because steel ball is that line contacts with the universal joint half slot, so quick abrasion, application life are lacked, can't be born to turn round greatly and refuse.
Universal shaft of underground motor of the present invention, upper cardan 10, lower cardan 16 contacts with mandrel 15 by spherical jacking block 9 respectively, semicircle block key 12 is set in respectively mandrel, and about in the of 15 two ends, withstood on the semicircle block key 12 by sphere cover 13, spherical by corrugated oil sealing 14 contacts with the sphere of spherical cover 13 again, corrugated oil sealing 14 screw threads and upper cardan 10, lower cardan 16 is threaded, be provided with ball fore-set face feather key 11 at mandrel 15, ball fore-set face feather key 11 and mandrel 15, upper cardan 10 and lower cardan 16 form together feather key and cooperate, and just form whole universal drive shaft part 4.
Such as Fig. 4, Fig. 5 and shown in Figure 6, be the structure of ball fore-set face feather key 11.Ball fore-set face feather key 11 lower cylindrical bodies 24 on the universal shaft of underground motor of the present invention inject in the cylindrical hole of mandrel 15 correspondences, and the interior feather key that forms of keyway that ball fore-set face feather key 11 top feather keys dull and stereotyped 25 inject upper cardan 10 or lower cardan 16 correspondences cooperates; The keyway root cylindrical surface that the sphere 26 at ball fore-set face feather key 11 tops and upper cardan 10 or lower cardan 16 are corresponding is corresponding.This feather key cooperates: the cylinder 25 of ball fore-set face feather key 11 bottoms is inserted in the cylindrical hole of mandrel 15 correspondences, and can rotate in the cylindrical hole of mandrel 15 correspondences, stirs mandrel 15 and rotates to transmit to turn round and refuse and rotating speed, plays the part effect of universal rotational; Play to transmit to turn round in the keyway of the dull and stereotyped 25 reeve upper cardans 10 of ball fore-set face feather key 11 top feather keys or lower cardan 16 correspondences and refuse and rotating speed, the face of cylinder of the keyway root of its upper cardan 10 or lower cardan 16 correspondences can be rotated at ball fore-set face feather key 11 top spheres 26 with the same center of circle along ball fore-set face feather key 11 top spheres 26, realizes the effect of another part universal rotational; Above-mentioned two parts rotary action just forms whole universal drive shaft effect.The overall work principle is: upper cardan 10, lower cardan 16 be together with ball fore-set face feather key 11, can be on mandrel 15 left-right rotation; Upper cardan 10 and lower cardan 16 can on ball fore-set face feather key 11 and mandrel 15, rotate up and down.Up and down two ends on the universal shaft of underground motor, every end are equipped with 4 to 8 groups of ball fore-set face feather keys 11.
As shown in Figure 3, be the structure of corrugated oil sealing.Corrugated oil sealing 14 comprises that mainly seal nipple 18, O type circle 19, pressure ring 20, packing element 21 and lower seal joint 22 form; Upper seal nipple 18 tops are spherical, match with the spherical of sphere cover 13, can rotate up and down with the same center of circle on sphere is overlapped 13 spherical; The internal thread of the screw thread of upper seal nipple 18 and upper cardan 10 or lower cardan 16 matches, and the O type circle 19 on it seals up corrugated oil sealing 14 and upper cardan 10 or lower cardan 16; After inside and outside corrugated rubber cover and the bonding extruding of wavy metal enhancement layer, be sulfided into corrugated packing element 21; Packing element 21 and upper seal nipple 18, pressure ring 20, the 22 inside and outside bonding extruding of lower seal joint, after packing element and upper seal nipple 18, pressure ring 20, lower seal joint 22 are linked together firmly, form corrugated oil sealing 14.
The corrugated oil sealing 14 of universal shaft of underground motor of the present invention and floating plug 8 have formed the movable sealing to all movable parts in the universal drive shaft, and some O-ring seals form the static seal to all movable parts in the universal drive shaft; The corrugated oil sealing 14 of universal drive shaft, floating plug 8 have formed up and down two annular seal spaces of universal drive shaft with some O type circles, fill with resistant to elevated temperatures lubricating grease in the annular seal space; The annular seal space internal pressure that resistant to elevated temperatures lubricating grease is filled with on ground is very little, work as G.I.H, thousands of meters wellbore pressures form huge pressure reduction to annular seal space, at this moment, just by the movement of floating plug 8, corrugated oil sealing 14, the high temperature resistant lubricating grease in the compression seal chamber has carried out the pressure compensation in the annular seal space, greatly dwindled the pressure reduction between annular seal space internal pressure and the outer surface pressure, and so that the lubricating grease of pressure chamber internal loss replenished.
Corrugated oil sealing 14, one ends of universal shaft of underground motor of the present invention are connected with universal joint and upper cardan 10, lower cardan 16 are connected with mandrel 15, have one O type circle that annular seal space is sealed between the two; Corrugated oil sealing 14 other ends are free ends, are enclosed within on the mandrel 15, and can move up and down at mandrel 15, and corrugated oil sealing 14 has O-ring seals between mandrel 15, annular seal space is sealed; The free end of corrugated oil sealing 14 is mobile inwards under the effect of external pressure, high temperature resistant lubricating grease in the compressible seal chamber, so that the outer pressure maintenance balance of pressure and annular seal space in the annular seal space, thereby protected the seal sealing effectiveness, prolonged application life of seal; In addition, the free end of corrugated oil sealing 14 is mobile inwards under the effect of external pressure, has remedied because the lubricating grease that the motion of each movable part loses in the annular seal space;
The floating plug 8 at universal shaft of underground motor of the present invention two ends, one section mobile cavity is arranged in upper cardan 10, lower cardan 16, floating plug 8 is mobile inwards under external pressure, lubricating grease in the compression seal chamber, so that the outer pressure of the pressure in the annular seal space and annular seal space keeps balance, remedied simultaneously because the lubricating grease that the motion of each movable part loses in the annular seal space.
Universal shaft of underground motor plays a part to form a connecting link in whole down-hole motor, its flexibility and project organization directly affect whole down-hole motor transmission and turn round and refuse and the size of rotating speed, and the intensity of motor rotor and power transmission shaft, be related to application life of whole down-hole motor.The universal shaft of underground motor of this invention, simple in structure, compact, use flexible, reliable, multiple functional, long service life, transmission to turn round and refuse the advantages such as large, it is the substitute of Petal type cardan axle, have higher than ball-joint formula universal drive shaft intensity, transmit to turn round and refuse large, structure than simple characteristics, be suitable for current drilling well required turn round greatly refuse, the rotating speed down-hole motor.
Use down-hole motor and can realize the drilling well of diameter, inclined shaft, extended reach well, horizontal well, Multilateral Wells, fishbone well, improve in the volume increase of oily company and store up; Reduce land occupation, be conducive to protection of the environment, shorten and see the well cycle, stop or the generation of minimizing accident; Be conducive to few input, fecund goes out, and has reduced greatly development cost.It is supporting that universal drive shaft of the present invention is suitable for the down-hole motor of 100,165,172,197,244 outside dimensions, and the down-hole motor of above-mentioned outside dimension has been included the required scope of application of drilling well substantially.
Claims (6)
1. universal shaft of underground motor, comprise the upper cardan (10) that is arranged in the universal shaft housing (17), mandrel (15) and lower cardan (16), described upper cardan (10) and lower cardan (16) are separately positioned on the two ends of mandrel (15), it is characterized in that: described upper cardan (10) contacts with mandrel (15) by spherical jacking block (9) respectively with lower cardan (16), be equipped with semicircle block key (12) in two ends up and down at mandrel (15), be provided with spherical cover (13) at semicircle block key (12); Periphery at mandrel (15) is provided with corrugated oil sealing (14), corrugated oil sealing (14) is connected 16 with upper cardan (10) with lower cardan) be connected, the spherical of corrugated oil sealing (14) contacts with the sphere of spherical cover (13); Be provided with ball fore-set face feather key (11) at mandrel (15), described ball fore-set face feather key (11) forms feather key with mandrel (15), upper cardan (10) and lower cardan (16) and cooperates;
Described ball fore-set face feather key (11) comprises cylinder (24), and at cylinder (24) side's of being provided with plate (25), the top of described side's plate (25) is sphere (26);
Described feather key cooperates: the cylinder (24) of ball fore-set face feather key (11) is arranged in the upper corresponding cylindrical hole of mandrel (15), rotates in cylindrical hole corresponding to mandrel (15); The square plate (25) of ball fore-set face feather key (11) is arranged on upper cardan (10) or keyway corresponding to lower cardan (16), the keyway root cylindrical surface that the sphere (26) of ball fore-set face feather key (11) is corresponding with upper cardan (10) or lower cardan (16) matches, and rotate at ball fore-set face feather key (11) top sphere with the same center of circle along ball fore-set face feather key (11) top sphere on the face of cylinder of the keyway root that upper cardan (10) or lower cardan (16) are corresponding.
2. universal shaft of underground motor according to claim 1 is characterized in that: be provided with 4 to 8 groups of ball fore-set face feather keys (11) at the two ends of described mandrel (15).
3. universal shaft of underground motor according to claim 1, it is characterized in that: be equipped with floating plug (8) at described upper cardan (10) and lower cardan (16), between corrugated oil sealing (14) and mandrel (15), be provided with O-ring seals, described floating plug (8) is used up and down 2 annular seal spaces of rear formation universal drive shaft with O-ring seals, is provided with lubricating grease in the sealing chamber.
4. universal shaft of underground motor according to claim 3 is characterized in that: the mobile cavity that is equipped with floating plug (8) at described upper cardan (10) and lower cardan (16).
5. universal shaft of underground motor according to claim 3, it is characterized in that: described corrugated oil sealing (14) is 2, one end of described corrugated oil sealing (14) is fixed end, the other end is free end, and described fixed end is connected with upper cardan (10) or lower cardan (16) by screw thread; Described free end moves up and down at mandrel (15).
6. according to claim 1 or 3 described universal shaft of underground motor, it is characterized in that: described corrugated oil sealing (14) comprises seal nipple (18), O type circle (19), pressure ring (20), packing element (21) and lower seal joint (22); Upper seal nipple (18) top is spherical, matches with the spherical of sphere cover (13), is provided with screw thread at upper seal nipple (18) and matches with the internal thread of upper cardan (10) or lower cardan (16); Described O type circle (19) seals up corrugated oil sealing (14) and upper cardan (10) or lower cardan (16); Upper seal nipple (18) and lower seal joint (22) are fixedly installed on the two ends of packing element (21) by pressure ring (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010222871 CN101906935B (en) | 2010-07-08 | 2010-07-08 | Universal shaft of underground motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010222871 CN101906935B (en) | 2010-07-08 | 2010-07-08 | Universal shaft of underground motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101906935A CN101906935A (en) | 2010-12-08 |
| CN101906935B true CN101906935B (en) | 2013-03-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010222871 Expired - Fee Related CN101906935B (en) | 2010-07-08 | 2010-07-08 | Universal shaft of underground motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101906935B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103510865B (en) * | 2012-06-20 | 2016-01-20 | 襄阳博亚精工装备股份有限公司 | Ball-cage-type universal shaft of screw drill |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5860864A (en) * | 1997-01-10 | 1999-01-19 | Camco International, Inc. | Joint assembly having self-biasing mechanism to bias two shafts into coaxial alignment |
| US6196922B1 (en) * | 1994-02-10 | 2001-03-06 | Netzsch Mohnopumpen Gmbh | Universal joint coupling in particular arranged on a universal joint shaft of an eccentric worm machine |
| CN2451719Y (en) * | 2000-11-30 | 2001-10-03 | 何元君 | Petroleum well screw drilling tool cardan shaft |
| CN2526495Y (en) * | 2001-12-13 | 2002-12-18 | 天津市渤海石油机械有限公司 | Sphere-shaped cardan shaft assembly for screw drilling tool |
| CN201763265U (en) * | 2010-07-08 | 2011-03-16 | 扬州天业石油机械有限公司 | Underground motor cardan shaft |
-
2010
- 2010-07-08 CN CN 201010222871 patent/CN101906935B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6196922B1 (en) * | 1994-02-10 | 2001-03-06 | Netzsch Mohnopumpen Gmbh | Universal joint coupling in particular arranged on a universal joint shaft of an eccentric worm machine |
| US5860864A (en) * | 1997-01-10 | 1999-01-19 | Camco International, Inc. | Joint assembly having self-biasing mechanism to bias two shafts into coaxial alignment |
| CN2451719Y (en) * | 2000-11-30 | 2001-10-03 | 何元君 | Petroleum well screw drilling tool cardan shaft |
| CN2526495Y (en) * | 2001-12-13 | 2002-12-18 | 天津市渤海石油机械有限公司 | Sphere-shaped cardan shaft assembly for screw drilling tool |
| CN201763265U (en) * | 2010-07-08 | 2011-03-16 | 扬州天业石油机械有限公司 | Underground motor cardan shaft |
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| Publication number | Publication date |
|---|---|
| CN101906935A (en) | 2010-12-08 |
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Application publication date: 20101208 Assignee: Yangzhou Kai Lin Yinyan Combustion Equipment Co Ltd Assignor: Yangzhou Tianye Petroleum Machinery Co., Ltd. Contract record no.: 2016320000108 Denomination of invention: Universal shaft of underground motor Granted publication date: 20130320 License type: Exclusive License Record date: 20160315 |
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