CN1018012B - Combined flexible connecting shaft resisting tension and compression - Google Patents

Abstract

The present invention relates to a flexible transmission shaft which can transfer larger power and bear the combined functions of pressing, pulling and twisting. The present invention is mainly used for connecting a single screw motor and the transmission shaft which are acted in petroleum industry and the well drilling operation of geological exploration. The present invention transfers torque and generates flexibility by the cooperation of a tubular spring, a supporting ring and an outer lantern ring; the present invention bears pressure load by the cooperation of a mandrel, a ball table, a ball seat and a spherical joint; the present invention bears pulling force load by the combination of the mandrel, the spherical joint, a spherical pad and a nut; the planetary motion of a rotor of the single screw motor can be effectively changed into the fixed-shaft rotation of the transmission shaft and a drill bit.

Description

Combined flexible connecting shaft resisting tension and compression

The present invention a kind ofly can transmit more high-powerly, bears pressure, draws and reverse symphyogenetic flexible drive axle, is mainly used in to connect employed single screw motor and transmission shaft in petroleum industry and the geologic prospecting drillng operation.

The cardan shaft of existing helicoid hydraulic motor inside, following three classes are generally arranged: (one) lobe shape cardan shaft: as the Dyna drill cardan shaft of U.S. Smith International company, two end connectors system cuts into three lobe shape structures by steel pipe through special process unit, make chimeric mutually linking portion produce angular difference by the cutting slit, by lobe tooth transmitting torque with carry pulling force when boring, transmit pressure by the locking ball at joint center.One of shortcoming of this cardan shaft is that the less bearing capacity of lobe tooth intensity is lower, and the normal force when transmitting Operating torque on the lobe tooth produces bigger bending moment in lobe tooth root portion, promptly turns to bending and comes transmitted load reversing; And the point of action of normal force is relevant with the wearing and tearing of centralized positioning steel ball with numerical value, can cause contact condition to worsen when worn steel ball, and the normal force point of action is moved down, it is big that numerical value becomes rapidly, causes disconnected lobe malicious event, and influence is crept into when serious, be forced to pull out of hole, this type of example once took place at the scene; Two of its shortcoming is outside this cardan shaft two ends lobe shape part the rubber that fills lubricating grease in two to be housed to protect capsule; in order to the protection locking ball in order to avoid contact mud and apply lubricated reducing wear; but find in the practice that this capsule usually is the most flimsy part; the capsule that bears the high frequency alternating stress is broken into fragment under the impact of high speed mud; cause screw drill transmission shaft shunting mud liquid road to stop up; thereby burn out a bearing; cause motor bypass valve hydrophthalmia congestion affects regular event; cause the bit port congestion affects to creep into, or the like.These have formed the outstanding disadvantage of this cardan shaft; Three of its shortcoming is technological equipments of lobe shape split requirement special use, invests greatlyyer, and cost is higher, and because of adopting the flame cutting, requires heat treatment process also complicated.In a word, above-mentioned accident in use once took place in the helicoid hydraulic motor of China's import, and influence is produced.(2) ball tooth cardan shaft: as the helicoid hydraulic motor that the Soviet Union makes, the joint part at its two ends system adopts spherical gear to connect, and one of its shortcoming is the processing technology complexity, the precision prescribed height, thereby cost is higher; Two of its shortcoming is that intensity is lower; Three of its shortcoming is poor to the adaptive capacity of environment, when it is worked in the mud of drilling tool inside, very easily causes wear-out failure; If improve purification requirement to mud system, can improve drilling cost again, and penetration and promotion is restricted, mention the weak link that this cardan shaft is a helicoid hydraulic motor in the relevant document of the Soviet Union several times.(3) polished rod flexible shaft: as the cardan shaft of the homemade helicoid hydraulic motor of the Soviet Union and China, its shortcoming is that length is excessive.The principle of this cardan shaft is to rotate by the dead axle that the flexibility of slender axles comes the planetary motion of motor rotor to be converted into transmission shaft, but because of receiving bigger moment of torsion (work moment), pressure and pulling force, the minimum diameter that has limited this axle again can not be too small, under certain minimum diameter, select oblique performance for guaranteeing that the desired flexibility of transmission only adds length, so just caused the helicoid hydraulic motor axial length obviously to increase to have reduced.Other has two kinds of transmission equipments, as helical spring type drain cleaner and automobile cardan shaft, the former compares the difference part and is not to be that planetary motion is become dead axle rotates with the present invention, do not bear bigger load and transmit more high-power, only be to realize non-coaxial flexible transmission, bear slight moment of torsion; The latter compares the difference part and is only to transmit non-coaxial rotation and moment with the present invention, employing be the crosshead gimbal structure.

The dead axle that the objective of the invention is to provide a kind of planetary motion single helicoid hydraulic motor, motor rotor to change transmission shaft and drill bit into rotates, simultaneously the motor rotor transmission of torque is crept into to drill bit, bear and transmit the combined flexible connecting shaft resisting tension and compression of the weight of the pulling force that produces under rotor axial pressure that motor produces in the course of the work and some operating mode.

The object of the present invention is achieved like this: it is by formations such as axle 1, spring (pipe spring) 2, outer sleeve 3, supporting ring 4, billiard table 5, ball seat 6, spherical joint 7, connecting rod 10 and fastening pieces.Pipe spring 2, outer sleeve 3 and supporting ring 4 combinations, pipe spring 2 peripheral hardware outer sleeves 3, in establish supporting ring 4 and produce flexiblely, planetary motion is changed into dead axle rotates, and transmit big moment.Axle 1, billiard table 5, ball seat 6 and spherical joint 7 combinations are born and the axial pressure when transmitting working rotor.The deadweight (pulling force) of proposing bottom combination when boring is born in combinations such as axle 1, spherical joint 7, ball ring 8 and nut 9.

Supporting ring 4 outer side surfaces have the flange of 0.5mm.The lead angle of pipe spring is less than 7 °, and the number of turns is 3-8, and the best is 5, and is left-handed.The external diameter of supporting ring 4 has slight magnitude of interference, itself and the slight interference fit of pipe spring 2 inwalls.Adopt 8 supporting rings 4, its total thickness is slightly larger than the spring section length of pipe spring.The hardness of supporting ring 4 is less than pipe spring hardness.Axle 1 has public affairs, two kinds of screw threads of English.The centre of sphere of billiard table 5 is positioned on the pipe spring 2 mid point axis.The big end sphere of spherical joint 7 is concentric with billiard table 5, and spherical joint 7 diameter of bores are not collided with the axle pull bar.

The present invention utilizes the crooked easily mechanical characteristic of spring to design, and it is flexible that combined type flexible connection axle is had, in order to throw of eccentric and the motion angular difference of compensation rotor because of producing between planetary motion and drive shaft axis, the influence of shock absorbing load simultaneously.

Advantage of the present invention:

1. bearing capacity height, long working life.

2. processing technology is simple, does not need special technological equipment, and the oil field tubulars substation can process, thereby cost is low.

3. length is short, thereby can make the helicoid hydraulic motor shorten length, improved drilling tool towards tiltedly and turn round azimuthal capability, can satisfy the requirement that high angle hole and horizontal well creep into.

4. have dismoutability and versatility,, can be respectively applied for homemade helicoid hydraulic motor of connection and import helicoid hydraulic motor because of its axle that has public affairs, two kinds of different screw threads of English.Can be the import helicoid hydraulic motor universal connecting shaft spare part is provided, the restorer ability to function can lack import, saves foreign exchange, produces high economic benefit.

The concrete structure of invention is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is the sectional drawing of the combined flexible connecting shaft resisting tension and compression of proposition according to the present invention.

Fig. 2 is the structural drawing of pipe spring 2.

Fig. 3 is the structural drawing of supporting ring 4.

It is flexible that Fig. 4 is that flexible connection axle of the present invention has, and can become the principle schematic that dead axle rotates to planetary motion.

Describe detail and the working condition that proposes according to the present invention in detail below in conjunction with Fig. 1～4.

This coupling shaft comprises axle 1 main body, and pipe spring 2 is to be got on the bus at lathe by pipe to make its peripheral hardware outer sleeve 3, in establish supporting ring 4, the 0.5mm flange of supporting ring outer side surface is that supporting ring is in contact with one another by flange, thereby does not cause the wearing and tearing at external cylindrical surface edge when the pipe spring is crooked.Supporting ring 4 and the slight interference fit of pipe spring 2 inwalls produce initial assembling pre-tensile stress; Supporting ring 4 external diameters have slight magnitude of interference, have the running-in of counteracting wearing and tearing, prolong the effect of operating life.Supporting ring 4 hardness, are promptly handled supporting ring 4 less than pipe spring hardness through heat treatment as easily damaged parts, change supporting ring when the gap of pipe spring 2 and supporting ring 4 reaches predetermined value.Adopt eight supporting rings 4, its total thickness guarantees to be slightly larger than the spring section length of pipe spring.Axle 1, billiard table 5, ball seat 6 and spherical joint 7 combinations are born and the axial pressure when transmitting working rotor.The pulling force that produces under some operating mode is born in combinations such as axle 1, spherical joint 7, ball ring 8 and nut 9.Axle has public affairs, two kinds of screw threads of English, all the other structures all with, can assemble different axles as required, connecting import drilling tool, homemade drilling tool or to load in mixture drilling tool, thereby make flexible connection axle of the present invention have versatility.Billiard table 5 on the axle 1 and the ball seat 6 on the spherical joint 7 are except that support pressure, another effect is to cause the pure flexure of spring distortion, the centre of sphere of billiard table 5 is positioned on the pipe spring 2 mid point axis, also restricted with prevent to manage spring 2 issuable corresponding deformation under axial force and centrifugal inertia force effect.The big end sphere of spherical joint 7 is concentric with billiard table 5.Spherical joint 7 diameter of bore sizes guarantee not collide with the axle pull bar.

Helicoid hydraulic motor in the course of the work, its motor rotor is done planetary motion because of hydraulic action, transmission shaft then rotates in fixed axis around the drilling tool body axis.One eccentric e is arranged, as shown in Figure 2 between rotor axis and drive shaft axis.In Fig. 1, the pipe spring satisfies above-mentioned eccentric e because of its flexible generation bending deflection.Because the centre of sphere of billiard table 5, ball seat 6 even parts is positioned in the middle of the spring, thus spring be deformed into the pure flexure distortion, thereby each cross section equal strength of assurance spring silk.

Under right-handed moment M effect, spring silk (left-handed) dwindles and is pressed on the interior support ring.Supporting ring hinders to contract in the spring silk and produces the Daqu stress in the bar.The spring silk produces under the supporting ring supporting and stretches, and is uniform tensile stress in the spring silk cross section, thereby turns to stretching reversing, and has brought into play the potentiality of material, has improved bearing capacity.

Spring expanded outward when outer sleeve 3 was used for preventing accidental the counter-rotating, the Daqu rod bending stress that restriction produces.This flexible shaft behind the ring of lagging can bear torque reaction (left-handed moment) in a small amount.

Rotor axial pressure is by axle 1, billiard table 5 and ball seat 6 even parts, and spherical joint 7, screw thread are delivered on the connecting rod 10, guarantees that spring itself does not bear axial pressure.Billiard table and ball seat idol part is and transmit outside the axial pressure except that the pure flexure distortion that guarantees spring, also restricted with prevent the additional deformation that spring produces under centrifugal action.When need changing, this even part should change in pairs.

Axle 1, spherical joint 7, face pad 8, nut 9 assemblies bear disassembly process, carry the pulling force and the following pulling force that produces of other fortuitous events that produce in the brill process, are elongated with spring free.Cotter pin B2 uses so that nut 9 location.

Connecting rod 10 is used for connecting two ends symmetric component and transmitted load.

The phenomenon that releases appears in the effect of Cock screw B1 when being to prevent to dismantle.Rubber washer 11 and plug screw B3 are used to seal pouring orifice, in case mud enters.

Claims (9)

1, a kind of combined flexible connecting shaft resisting tension and compression that is used for connecting petroleum industry and employed single screw motor of geologic prospecting drillng operation and transmission shaft, it is made of axle 1, pipe spring 2, it is characterized in that also being provided with outer sleeve 3, supporting ring 4, billiard table 5, ball seat 6, spherical joint 7, ball ring 8, connecting rod 10 and fastening piece etc.:

(1) pipe spring 2, outer sleeve 3 and supporting ring 4 combinations, pipe spring 2 peripheral hardware outer sleeves 3, in establish supporting ring 4, produces flexiblely, planetary motion is changed into dead axle rotates, transmit moment greatly;

(2) axle 1, billiard table 5, ball seat 6 and spherical joint 7 combinations are born and the axial pressure when transmitting working rotor;

(3) pulling force that produces under some operating mode is born in combinations such as axle 1, spherical joint 7, ball ring 8 and nut 9.

2, coupling shaft as claimed in claim 1 is characterized in that supporting ring 4 outer side surfaces have the flange of 0.5mm.

3, coupling shaft as claimed in claim 1, the lead angle that it is characterized in that managing spring 2 is less than 7 °, and the number of turns is 3-8, and is left-handed.

4, coupling shaft as claimed in claim 1, the number of turns the best that it is characterized in that managing spring 2 is 5.

5, coupling shaft as claimed in claim 1 is characterized in that the external diameter of supporting ring 4 has slight magnitude of interference, itself and the slight interference fit of pipe spring 2 inwalls; Adopt 8 supporting rings 4, its total thickness is slightly larger than the spring section length of pipe spring.

6, coupling shaft as claimed in claim 1, the hardness that it is characterized in that supporting ring 4 is less than pipe spring hardness.

7, coupling shaft as claimed in claim 1 is characterized in that axle 1 has public affairs, two kinds of screw threads of English.

8, coupling shaft as claimed in claim 1 is characterized in that the centre of sphere of billiard table 5 is positioned on the pipe spring 2 mid point axis.

9, coupling shaft as claimed in claim 1 is characterized in that the big end sphere of spherical joint 7 is concentric with sphere 5, and spherical joint 7 diameter of bores are not collided with the axle pull bar.

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