CN2276985Y - Pressure balance sealed bearing tri-cone rotary drill bit - Google Patents

Abstract

The utility model discloses a pressure balance sealed bearing roller bit used for drilling a petroleum well. The utility model is composed of a cone leg shaft journal (1), a roller cone inner hole (2), a shaft sealing ring (3), clamp springs (4), a pressure balancer (5), screw plugs (7), gauge teeth (27), cutting teeth (28), back cone teeth (29) and other main components. The utility model is characterized in that the integration of the pressure balancer with a sealed bearing is realized, the sealed bearing has a novel structure, and the outside diameter of the sealed bearing is locked by the clamping springs with cylindrical surfaces; double-face spoon-shaped teeth (30), spoon-shaped conical ball teeth (34) with conical surfaces and cylindrical polycrystalline diamond teeth (38) with sleeves are adopted as teeth of a roller cone. The reliability of sealing a shaft and the reliability of locking the roller cone are enhanced, and the utility model is favorable for raising the work index of a drill bit and is favorable for reducing the cost of drilling wells.

Description

A kind of pressure balance seal bearing rock bit

The utility model relates to a kind of pressure balance seal bearing rock bit that oil and geological drilling are used, particularly a kind of incorporate rock bit of sealed bearing that has realized pressure equaliser and jump ring locking, adopt novel jump ring and bearing sealed ring to improve the reliability of locking gear wheel and bearing seal, adopt novel cutter teeth to improve efficiency of breaking rock, help improving bit life and bit performance.

Consult the Patent document data relevant, the background and the present situation of relevant prior art is provided with the utility model.

1, about pressure equaliser, every sealed bearing rock bit must have pressure equaliser, and balance drill bit sealed bearing external and internal pressure is poor, guarantees bearing sealed ring operate as normal under inside and outside differential pressure condition in a basic balance.Pressure during from drilling well in the pit shaft when pressure of mud column and drill bit work gear wheel broken formation rock make gear wheel produce high-frequency axial motion inside and outside sealed bearing, to produce pressure differential, need the distortion of the rubber pressure equalizer (also being pressure compensator) in the pressure equaliser to come balanced seal bearing external and internal pressure poor.Pressure equaliser generally is made up of five parts such as plug, gland, protection cup, pressurizer and pressure transmission hole, long oil hole, oil filler point, oil through and four holes and drill bit fat; pressure transmission hole communicates with well mud; other holes communicate with bearing; in pressure equaliser and sealed bearing, be full of drill bit lubricating grease; it is poor that pressurizer transmits pressure balance seal bearing external and internal pressure by drill bit fat, guarantees that sealing ring can long-time operate as normal.The sealed bearing rock bit that each drill bit company produces all has the pressure equaliser of oneself, and all be to be arranged in Dou face place, bit leg top (in Fig. 1 top Dou face centerline), because the there has bigger volume to come the setting pressure bascule, the prior art of Here it is pressure equaliser, the problem that exists is that this position is too far away apart from bearing sealed ring, transmit pressure and will pass to sealing ring, so its sensitivity and reliability are all relatively poor by the radial clearance of long oil hole, oil through and bearing.Each company is all updating prior art both at home and abroad, and the one, constantly improve existing apparatus; The 2nd, make this device summary and miniaturization, and make its more close bearing; The 3rd, this device is placed on sealed bearing inside.We have consulted the research and development trend of relevant Patent document data, particularly U.S. Hughes, Smith, end moral and Sai Kerui top grade four big drill produced companies both at home and abroad for this reason, and in general the drill bit new technology is often from this four major company.The pressure equaliser of the sealed bearing rock bit that these companies produce all is to be placed on Dou face place, bit leg top.For example U.S. Pat 4984643, US4811801, US4911255 and US4330158.About the patent of summary and miniaturization has US4386667 and US4380072, these two patents all are to have an easy pressure equaliser to be placed on the import department in long oil hole at bit leg top Dou face place, communicate with bearing by the oil through in long oil hole and the bearing or plug Xiao hole.But these patents have been authorized not see on drill bit about 10 years and have been used, and their poor practicability is described, poor reliability can not replace existing apparatus.Also have two patents such as US4519719 and US4597455, last patent is to have designed an easy pressure equaliser in bit leg back cone brill plug Xiao hole site to be communicated with the sealing ring position by a thin oil through, it is Patent right that this is that Hughes Electronics was invested on May 18th, 1985, but do not see that so far application note does not have practical value; The patent in back is the non-working surface (top) that a miniature pressure equaliser is placed on axle journal, and shortcoming is that equalizer is too little, and on July 1st, 1986 authorized, and did not see that so far application also illustrates its poor reliability, does not have practical value.Through consulting the technology identical or similar of finding to the utility model.

2, relevant jump ring problem.The invention of U.S. Hughes Electronics is locked gear wheel with jump ring (elastic spring), its patent No. US4491428 (mandate on January 1st, 1985), and the said firm is the very fast steel ball locking gear wheel that replaces on the various sizes drill bit after on probation achieving success on the small bits.Using garden sectional area steel wire at the beginning, made approximate D tee section afterwards into, is exactly garden cylinder of jump ring internal diameter mill.Begin to find that from the nineties jump ring has two shortcomings: the one, be not suitable for high rotating speed, jump ring is that line contacts with 15 ° of Dou faces at bit leg jump ring groove place, makes a part of lubricating grease gasification influence the life-span of sealed bearing at the garden of high-speed condition lower circlip tee section and 15 ° of Dou face relative motions generation higher friction heat energy; The 2nd, axle journal quick-wearing very after the drill bit seal failure, grinding off behind the carburized layer the soft matrix of axle journal begins to be out of shape under the pressure of the drill effect the width of jump ring groove is diminished, when being contacting with jump ring of garden arc, the jump ring groove of gear wheel under the effect of borehole wall thrust, produces a lateral force entad, can in axle jump ring groove, push away jump ring, any point jump ring progressively is stuck in the bit leg journel groove, and the two ends of jump ring will be pushed into a jump ring groove generation lost cone accident under the thrust of gear wheel jump ring groove.Use steel ball locking gear wheel instead based on the decision of above 2 Hughes Electronicss, only still keep jump ring locking gear wheel on small bits, the Jianghan Bit Plant that introduces U.S. Hughes Electronics rock bit manufacturing technology is now also making steel ball locking gear wheel into.

3, relevant Simmer ring problem.At present the rock bit Simmer ring all is the rubber seal of real core, major part is the O tee section, but other shapes are also arranged.The ATM of U.S. Hughes Electronics type drill bit adopts the sealing ring of metal o-ring and rubber ring combination.Prior art that Here it is.There is a hollow rubber o-ring patent US4279250 (mandate on July 21st, 1981) in U.S. Sai Keruite company, does not use but see on drill bit so far, illustrates that it does not have practical value.The shortcoming of the real core O of prior art shape rubber seal is that the frictional heat of it and bearing seal face is higher, influences the bearing seal life-span.Do not find the technology identical with the utility model.

4, about the cutter teeth problem.U.S. Pat 4108260 (mandate on August 22nd, 1978), this is U.S. Hughes Electronics scoop chisel insert patent, afterwards again through improving several times, scoop chisel insert has its advantage, when breaking rock, there is spoonful shape just to increase the scope of freedom and helps improving efficiency of breaking rock, the shortcoming that it is also arranged, the one, scoop chisel insert back protuberance has compaction in the time of will leaving rock surface to tooth; The 2nd, there is other tooth that the veer problem is arranged, also there is a little spoon shape in Hughes Electronics on the conical surface of blunt conical-ended shape insert.It is fine that U.S. Smith, Rui De company all adopt the blunt conical-ended shape insert effect on high speed bit in addition, and the stratum that its adapts to is wider than scoop chisel insert, and blunt conical-ended shape insert do not have directional problems, and these company's gear wheel gauge compacts all adopt the tack hard-metal insert.

The purpose of this utility model is to improve above four problems that the aspect prior art exists, and specifically improves content: the one, realize that pressure equaliser and sealed bearing are integrated; The 2nd, adopting the external diameter that does not produce lateral force is reduce friction heat and prevent lost cone of the silver-plated jump ring of garden cylinder; The 3rd, adopt the flexible compound sealing ring, the frictional heat between reduction and the sealing surface improves bearing life; The 4th, the cutter teeth gauge teeth adopts two-sided scoop chisel insert, cutting teeth adopts does not have directionality spoon shape conical surface blunt conical-ended shape insert, gauge compact adopts the garden post polycrystalline diamond tooth of band carbide alloy cover, improves the reliability and the tooth life of locking gear wheel and sealed bearing, improves bit performance.

The improved technical scheme of the utility model and theing contents are as follows:

1, realize the integrated of pressure balance dress and sealed bearing, simplified structure and manufacturing process reduce production costs.The scheme that adopts is that pressurizer is placed in the hole at bit leg journel center, and little axis hole and fixing and sealing load equalizer are advanced in little axial compression, prevents that mud from entering bearing.Specific practice is to finish each position processing of axle journal, adopt the eccentric oil storage tank of car partial method at a dark 3mm of axle journal non-stress face car, there are 30 ° of Dou at the two ends of groove towards disappeared along stretching in 200 ° of scopes of axle journal non-stress face by force direction, then bit leg is sent to heat treatment, be coated with masking paste at the position of needs processing and boring.After the heat treatment axle journal is processed, drill centers at first, the degree of depth surpasses the last machined surface 10mm of axle journal, expand centre bore and become the pressurizer hole, at import department's little axis hole that drills and reams, 30 ° of Dou face places of the eccentric grove of close sealing surface drill through oilhole on axle journal top then, the degree of depth surpasses axle journal baseplane 10mm, contoured surface brill pressure transmission hole and centre bore at the bit leg trailing flank drill through, bore oil filler point again and oil through drills through, at the stifled screwed hole of its import department's tapping, the processing that this has just finished the various holes of bit leg pressure balance seal bearing is installed in pressurizer in the equalizer hole, littler axis hole is gone in little axial compression, tighten up little axle by interference fit, the sealing position in little axle cross section, lower seal face diameter compaction pressure equalizer import department garden can prevent that like this mud from entering bearing, compresses into little axle back axle journal is ground processing, big pilot pin grinds the axiality that guarantees them together, finishes after mill axle journal and the polishing sealing surface packing of axle journal being carried out carrying out behind the cleaning, drying gear wheel and bit leg; Simmer ring is enclosed within the axle journal bottom, jump ring is placed on jump ring groove place jump ring is pressed from both sides into bit leg journel jump ring groove with Circlip tongs, again the gear wheel that processes is buckled in the upper and lower pressure gear wheel promotion of axle journal Circlip tongs and removes Circlip tongs on earth, again gear wheel is pressed downwardly onto the baseplane, jump ring just flicked and entered gear wheel jump ring groove this moment.At last plug is tightened and prevent have water to enter bearing in the operation afterwards.Gear wheel and bit leg that branch installs, three assembly weldings are integral wagon drill head joint spiral shell mosquito, after bit face is cleaned up, remove plug and bearing are vacuumized and annotates lubricating grease, fill with the back plug is tightened, and three bit legs all will vacuumize and annotate lubricating grease.Whole processing of pressure balance seal bearing rock bit have so just been finished.

2, adopting external diameter is the jump ring of garden cylinder.For overcoming the shortcoming that Hughes's jump ring locking gear wheel exists, decision is worn into the garden cylinder to the external diameter of garden tee section jump ring, 15 ° of Dou faces are arranged on jump ring top, one section plane of mill, bottom, gear wheel jump ring groove is a right-angle plane, because of gear wheel jump ring groove does not have entad lateral thrust to jump ring, when drill bit is worked, gear wheel jump ring groove promotes jump ring, it is that 15 ° of faces contact that 15 ° of Dou faces on jump ring top interact with 15 ° of Dou faces at bit leg journel jump ring groove place, rather than line contact, the heat of under the certain condition of the pressure of the drill and rotating speed, will reducing friction.After the bit bearing seal failure, axle journal heavy wear and lead axle journal jump ring groove place distortion, garden cambered surface to jump ring internal diameter bottom after groove width diminishes has an outside thrust, and gear wheel jump ring groove does not have lateral thrust entad, therefore can not take place the stuck lost cone accident that causes in the jump ring groove of jump ring.For the heat of reducing friction jump ring is carried out silver-plated plaing in addition and subtract the mushroom effect, also help preventing to block jump ring generation lost cone accident.Jump ring after the improvement has improved the reliability of locking gear wheel and can make it be fit to high rotating speed.The jump ring cross section is modified into by present D shape

Shape, just in time opposite, make jump ring more can satisfy the needs of locking gear wheel.

3, adopt the flexible compound sealing ring.Adopt band low-melting alloy core O shape rubber seal, alloy core was with regard to liquefy when bearing temperature reached 57 ℃ when drill bit is gone into the well work, at this moment composite sealing ring becomes very soft, can reduce and sealing surface between frictional heat, and can adapt along with the variation of drill bit axle journal stress surface and non-stress face seal cavity, help improving bearing life.

4, about the cutter teeth problem.It should cut the outer rows of teeth of gear wheel (gauge teeth) borehole wall and cut bottom rock again, therefore adopts scoop chisel insert more suitable, in order to overcome the shortcoming of Hughes's scoop chisel insert, adopts two-sided scoop chisel insert, is exactly that original scoop chisel insert back of tooth bump pad increases a little spoon shape face.Improved reason is that the tooth fractured rock mainly contains three processes: the one, and there is spoonful shape can increase the scope of freedom when beginning to contact rock; The 2nd, rock produced volumetric fracture when tooth vertically acted on rock surface; The 3rd, when beginning to leave rock surface, the back of tooth has a compaction to rock, if the back of tooth also has a little spoon shape just to increase the scope of freedom and reduced compaction, therefore there are two spoon shape faces better than one, scoop chisel insert also has a shortcoming, be exactly indivedual tooth veers, at anti-groove that turns to of the following increase of interior spoon face.The cutting teeth of gear wheel adopts spoon shape conical surface blunt conical-ended shape insert, form by three parts, tooth top is spherical, the bottom is a taper, spoon shape conical surface shape on the centre, these are different with Hughes's spoon shape blunt conical-ended shape insert, and it has directionality, what adopt now then is not have directionality spoon shape blunt conical-ended shape insert, and the gear wheel gauge compact adopts the garden post polycrystalline diamond tooth of band carbide alloy cover.

The utility model compared with prior art has following advantage:

1, realized that pressure equaliser and sealed bearing are integrated, make pressurizer more near sealing ring, pressure balance has increased reliability, simplify the structure to greatest extent and manufacturing process, reduced cost of production, mud plays cooling effect to bearing around entering centre bore and equalizer, helps the raising of bearing life, more than these all are that prior art is not accomplished, be better than prior art;

2, adopting silver-plated external diameter is the reliability that the jump ring of garden cylinder has improved the locking gear wheel, and the heat of reducing friction prevents the lost cone accident, has improved bearing life, and these all are better than prior art;

3, adopt the flexible compound sealing ring, the frictional heat between reduction and the sealing surface helps improving bearing life, and this is that prior art is unexistent;

4, gear wheel adopts two-sided scoop chisel insert gauge teeth, the garden post polycrystalline diamond gauge compact of spoon shape conical surface blunt conical-ended shape insert cutting teeth and band carbide alloy cover, more than three kinds of teeth all be the novel tooth form that meets brokenly the rock rule, it is optimum Match that the three is contained on the same gear wheel, be that prior art is not accomplished, help the raising of efficiency of breaking rock and the guarantor footpath of drill bit, help improving bit performance.

Further describe concrete structure of the present utility model below in conjunction with accompanying drawing.

Fig. 1 is the utility model pressure balance seal bearing integral structure schematic diagram;

Fig. 2 is the utility model jump ring locking cone structure schematic diagram;

Fig. 3 is that this reality is made novel flexible composite sealing ring structural representation;

Fig. 4 is the two-sided scoop chisel insert structural representation of the utility model;

Fig. 5 is the utility model spoon shape conical surface blunt conical-ended shape insert structural representation;

Fig. 6 is the utility model band cover garden post polycrystalline diamond toothing schematic diagram;

The utility model accompanying drawing number: 1-bit leg journel; 2-gear wheel endoporus; 3-Simmer ring; 4-jump ring; 5-little axle, 6-pressurizer; 7-plug; 8-centre bore; 9-equalizer hole, 10-little axis hole; 11-pressure transmission hole; 12-eccentric grove; 30 ° of Dou faces of 13-eccentric grove; 14-oil through; 15-oil filler point; 16-plug spiral shell mosquito hole; 17-drill bit fat; 18-axle jump ring groove; 15 ° of Dou faces of 19-jump ring groove; 15 ° of Dou faces of 20-jump ring; 21-jump ring external diameter; 22-jump ring baseplane;

23-gear wheel jump ring groove; 24-flexible compound sealing ring; 25-low-melting alloy core; 26-rubber ring; 27-gauge teeth; 28-cutting teeth, 29-gauge compact; 30-two-sided scoop chisel insert; 31-interior spoon shape face; 32-outer spoon shape face; 33-anti-the groove that turns to; 34-spoon shape conical surface blunt conical-ended shape insert; 35-sphere; 36-spoon shape conical surface; 37-garden conical surface; 38-band cover garden post polycrystalline diamond tooth; 39-garden post polycrystalline diamond tooth; 40-carbide alloy cover.

To technology contents of the present utility model, concrete structure and enforcement are described further and illustrate in conjunction with the accompanying drawings.

Fig. 1 is the utility model pressure balance seal bearing integral structure schematic diagram, it has realized the integrated of pressure equaliser and sealed bearing, make pressurizer more near Simmer ring, simplify the structure and manufacturing process, improved pressure balanced reliability, as seen from Figure 1 pressure equaliser is simplified to only remaining plug and two parts of pressurizer, pressurizer is placed on the distance that has shortened pressurizer and Simmer ring in the hole of journal centre, make pressure balance rapider, sensitiveer.The pressure balance seal bearing is integrated to be because four holes of seven parts and drill bit fat 17 compositions such as bit leg journel 1, gear wheel endoporus 2, Simmer ring 3, jump ring 4, little axle 5, pressurizer 6, plug 7, centre bore 8, pressure transmission hole 9, oil through 14, oil filler point 15, pipe plug openings 16.Concrete enforcement is that appearance and size at bit leg journel processes, car eccentric grove 12 increases the bearing oil storage and improves bearing lubrication, send heat treatment then, little axis hole to needs processing, oil through, each position such as pressure transmission hole and oil filler point all will be coated with masking paste, after heat treatment is intact, at first auger spindle neck centre bore 8 degree of depth surpass the last machined surface 10mm of axle journal, the car equalizer hole 9 and the little axis hole 10 that drills and reams again, drill through oilhole 14 degree of depth at 30 ° of Dou face 13 places of eccentric grove and surpass axle journal baseplane 10mm near the sealing surface place, boring pressure transmission hole 11 at bit leg trailing flank outer surface drills through with centre bore, boring oil filler point 15 drills through with oil through 14, in the stifled spiral shell mosquito hole 16 of import department's tapping of oil filler point, so just finished the processing in various holes.Pressurizer 6 is put into equalizer hole 9, little axle 5 is compressed into little axis hole 10 tighten up little axle by interference fit, the sealing position in the cross section, diameter compaction pressure equalizer import department garden of little axle bottom, guarantee that mud can not enter in the bearing, grind axle journal, sealing surface and little shaft diameter then, guarantee their axiality.Carry out the packing of bit leg and gear wheel after axle journal cleaned up, at first Simmer ring 3 is enclosed within the root of bit leg journel 1, jump ring 4 is enclosed within on the jump ring groove, with Circlip tongs it is pressed from both sides in the jump ring groove 18, the gear wheel that processes is enclosed within past pressing down on the axle journal, promotes Circlip tongs and descend, remove Circlip tongs gear wheel is pressed onto the end, this moment, jump ring entered gear wheel jump ring groove 23 automatically, had water to enter bearing in the operation after plug 7 is screwed into plug screwed hole 16 and prevents.Just can remove plug behind the car finishing drilling joint spiral shell mosquito and sealed bearing be vacuumized and annotates drill bit lubricating grease, tighten plug after filling with, finish the processing of drill bit like this.Gear wheel outer cone iron chains have three kinds of teeth such as gauge teeth 27, cutting teeth 28 and gauge compact 29.

Fig. 2 is the novel jump ring locking of this a reality cone structure schematic diagram, the gear wheel endoporus 2 of rock bit and bit leg journel 1 are formed bearing, gear wheel is rotation along with the revolution of drill bit, must there be a locking part to tangle gear wheel, prevent that it from falling down, generally all adopt steel ball, adopting jump ring is the simplest a kind of locking part.The utility model adopts a kind of new construction jump ring to improve the shortcoming that prior art exists.Be that jump ring 4, axle jump ring groove 18,15 ° of Dou faces 19 of jump ring groove, 15 ° of Dou faces 20 of jump ring, jump ring external diameter 21, jump ring baseplane 22, the gear wheel jump ring groove 23 of garden cylindroid formed by external diameter as seen from Figure 2.Illustrate the structural requirement that improves the back jump ring, the jump ring that is used for  215.9mm rock bit is to adopt the elastic wire of  4.88mm to make, require the jump ring external diameter is worn into the garden cylinder, the baseplane of regrinding makes width equal 2mm, at 15 ° of Dou faces of jump ring top mill to internal diameter direction, parallel with 15 ° of Dou faces of jump ring groove, 15 ° of Dou face width degree wearing into are 1mm, the jump ring internal diameter is the garden cambered surface of former steel wire, right-angle plane is formed in the external diameter of jump ring and baseplane, so gear wheel jump ring groove is the right-angle plane shape.When drill bit is worked, produce the axial motion of upper frequency during tooth broken formation rock, when borehole wall counter-force promotes the gear wheel back cone, gear wheel jump ring groove right-angle plane promotes jump ring, 15 ° of Dou faces of 15 ° of Dou face contact jump ring grooves of jump ring, gear wheel jump ring groove after the improvement is not garden cambered surface but right-angle plane, it does not have entad lateral thrust to jump ring, after bearing seal was lost efficacy, axle journal heavy wear and being out of shape, axle jump ring well width diminishes and also can not block jump ring, produce mutual thrust because axle journal contacts with garden, jump ring bottom cambered surface, make jump ring can not enter a jump ring groove, both made and certain has taken place a bit blocked jump ring, two end faces of jump ring can be by cone groove cardan shaft jump ring groove yet because the gear wheel jump ring poor be right-angle plane can not produce this thrust.Silver-plated for the heat of reducing friction in addition to jump ring, new jump ring to the contact of 15 ° of Dou faces of jump ring groove be not line contact but 15 ° of Dou in the face of 15 ° of Dou faces, under the pressure of the drill and rotating speed certain condition, can reduce frictional heat.Adopt can reduce friction heat and prevent lost cone of new jump ring.The jump ring cross section is modified into by the D shape of prior art

Shape can be satisfied the needs of locking gear wheel better.

Fig. 3 is the utility model flexible compound ring structure schematic diagram.Flexible compound sealing ring 24 among Fig. 3 is made up of low-melting alloy core 25 and rubber ring 26. and manufacture method is the low-melting alloy ring that produces the cross section, garden with mould, the fusing point of alloy is 57 ℃, suppress Ban Yuan ring section rubber ring blank with mould again, be placed on alloy hoop between two rubber mass and compacting, the mould of putting into the compacting O-ring seals behind the interface integrator of two blanks is put on the sulfuration flat board, just can suppress this flexible compound sealing ring, to be in the liquid airproof circle very soft for alloy core when taking out sealing, alloy core becomes solid-stately when temperature is reduced to below 57 ℃, and the feel of sealing ring at this moment and common real core sealing ring are much at one.This sealing ring is contained in goes into the well on the drill bit when using, because down-hole slurry temperature, the frictional heat that bit bearing when work produces surpasses 57 ℃ soon, makes the alloy core liquefy, particularly when the following well depth of 1800mm uses under the drill bit during to the shaft bottom alloy core just liquefied naturally.Illustrate, if make the bearing sealed ring that is applicable to  215.9mm rock bit, the low-melting alloy core diameter is  1.5mm, and the O-ring seals diameter of section is  5.5mm, and the wall thickness of rubber ring is 2mm.Use the flexible compound sealing ring to be specially adapted to the deep-well drill bit, the high regional drilling well of geotemperature is with drill bit and high-speed slide bearing rock bit, its flexibility helps reducing the frictional heat between sealing ring and the sealing surface, owing to can make the frictional heat at shaft strength face and each position of non-stress face equal substantially.Help improving bearing life.

Fig. 4 is the two-sided scoop chisel insert structural representation of the utility model, and the gauge teeth 27 of drill bit adopts two-sided scoop chisel insert 30, and the flank of tooth is by interior spoon shape face 31, and outer spoon shape face 32 and the anti-groove 33 that turns to are formed, and improved content is to increase an outer spoon shape face and the anti-groove that turns to.The tooth fractured rock has three main processes, and the one, when tooth begins the wedging rock, there is a spoon shape face just to increase the scope of freedom and helps improving efficiency of breaking rock; The 2nd, the vertical rock crushing of tooth tooth top makes rock produce volumetric fracture; The 3rd, tooth begins to leave the moment before the rock, and the back of tooth protuberance of existing scoop chisel insert has compaction to rock, increases a little spoon shape face and just reduce compaction plane even increased a scope of freedom again on the back of tooth, helps rock and enlarges the plane of disruption.Therefore there are two spoon shape faces better than a spoon shape face, in order to prevent indivedual teeth because the magnitude of interference of permanent tooth is little or to drill bit use later stage individual teeth the phenomenon of veer is arranged sometimes, for preventing to turn to anti-groove 33 that turns to of bottom processing at interior spoon shape face, wide 2mm, dark 1mm, long 2mm, this groove does not influence the permanent tooth effect, can on trough rim gear wheel matrix, play distortion with the ream head, also can not beat in the drill bit use behind the tooth wedging rock, rock is compressed into groove to the gear wheel matrix on limit, hole and is just played anti-turning to and acted on.A profile spoon face and the anti-groove that turns to have compared with prior art been increased after improving like this.

Fig. 5 is the utility model spoon shape conical surface ball toothing schematic diagram.

The cutting teeth 28 of gear wheel adopts spoon shape conical surface blunt conical-ended shape insert 34, form by sphere 35, the spoon shape conical surface 36 and the garden conical surface 37, so just common blunt conical-ended shape insert is modified into a spoonful shape conical surface blunt conical-ended shape insert, the main content of improving is to have increased the spoon shape conical surface between the sphere and the garden conical surface, and this tooth is become has not had the scoop chisel insert of directionality.

Fig. 6 is the utility model band cover garden post polycrystalline diamond toothing schematic diagram.

The gauge compact 29 of gear wheel adopts band cover garden post polycrystalline diamond tooth 38, and the abrasion resistance that improves it has just increased the footpath ability of protecting, and is made up of carbide alloy cover 40 and garden post polycrystalline diamond tooth 39.But garden post polycrystalline diamond tooth be placed in the copper base WC powder adopt pressure sintering just sintering go out garden post polycrystalline diamond tack tooth with the carbide alloy cover, behind the mill external diameter it is compressed into gear wheel back cone hole, this tooth has crept into and has protected the footpath ability preferably grinding the stratum.

Can see that from the above description characteristics of the present utility model are that realization pressurizer and sealed bearing are integrated, adopt the sealing ring of new construction and the reliability that the gear wheel jump ring has improved bearing seal and locking gear wheel, adopt gauge teeth, cutting teeth and the gauge compact of new construction to improve guarantor's footpath ability and efficiency of breaking rock, help improving bit performance and reduce drilling cost.

Claims (7)

1, a kind of pressure balance seal bearing rock bit, by bit leg journel (1), gear wheel endoporus (2), Simmer ring (3), jump ring (4), little axle (5), pressurizer (6), plug (7), gauge teeth (27), cutting teeth (28) and gauge compact major parts such as (29) are formed, it is characterized in that realizing that pressurizer (6) and external diameter are that the new construction sealed bearing of garden cylinder jump ring (4) locking is integrated, pressurizer (6) is arranged in bit leg journel (1) the center pressure equalizer hole (9), little axle (5) is compressed into the fixing and sealing load equalizer of little axis hole (10), and Simmer ring (3) adopts the non-stress face of flexible compound sealing ring (24) and bit leg journel (1) that the rock bit of oil storage eccentric grove (12) and gear wheel outer cone iron chains dress new construction cutter teeth is arranged.

2, rock bit according to claim 1 is characterized in that adopting the O tee section jump ring (4) of electroplate, is made up of 15 ° of Dou faces of jump ring (20) and jump ring baseplane (22) on garden cylindricality jump ring external diameter 21, arc internal diameter top, garden.

3, rock bit according to claim 1 is characterized in that Simmer ring adopts flexible compound sealing ring (24), is made up of low-melting alloy core (25) and rubber ring (26).

4, rock bit according to claim 1 is characterized in that the eccentric oil storage tank in 200 ° of scopes of bit leg journel (1) non-stress face, is made up of 30 ° of Dou faces of eccentric grove (13) at eccentric grove (12) and two ends.

5, root is put forward the described rock bit of claim 1, it is characterized in that gauge cutter (27) adopts two-sided scoop chisel insert (30), and profile of tooth is by interior spoon shape face (31), and outer spoon shape face (32) and the anti-groove (33) that turns to are formed.

6, rock bit according to claim 1 is characterized in that gear wheel cutting teeth (28) adopts spoon shape conical surface blunt conical-ended shape insert (34), and profile of tooth is made up of sphere (35), the spoon shape conical surface (36) and the garden conical surface (37).

7, rock bit according to claim 1 is characterized in that gear wheel gauge compact (29) adopts band cover garden post polycrystalline diamond tooth (38), is made up of garden post polycrystalline diamond tooth (39) and carbide alloy cover (40).

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