CN203515327U - Double-sealing roller bit with sealing pressure adjusting device - Google Patents
Double-sealing roller bit with sealing pressure adjusting device Download PDFInfo
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- CN203515327U CN203515327U CN201320619436.XU CN201320619436U CN203515327U CN 203515327 U CN203515327 U CN 203515327U CN 201320619436 U CN201320619436 U CN 201320619436U CN 203515327 U CN203515327 U CN 203515327U
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- storage hole
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Abstract
The utility model relates to the technical field of drilling tools, in particular to a double-sealing roller bit with a sealing pressure adjusting device. A pressure adjusting device is arranged on the back conical surface of a roller, the pressure adjusting device comprises a pressure transmission hole, a small oil storage hole, a small oil storage bag and a small oil storage hole plug, the small oil storage hole is formed in the back conical surface of the roller, the pressure transmission hole is formed in a supporting baffle to enable a bearing sealing cavity and the small oil storage hole to be communicated, the small oil storage bag is fixed in the small oil storage hole, one end of the small oil storage bag is open, the other faces of the small oil storage bag are closed, the opening portion of the small oil storage bag faces the bearing sealing cavity, the small oil storage bag is fixed in the small oil storage hole through the small oil storage hole plug, and a pressure transmission through hole is formed in the middle of the small oil storage hole plug. The device can effectively balance the pressure difference on the two sides of a sand blocking ring, the sand blocking ring can work under the small pressure difference, and the service life of the sand blocking ring is prolonged.
Description
Technical field
The utility model relates to drilling tool technical field, relates in particular to a kind of double containment rock bit with sealing load adjusting device.
Background technology
Rock bit is the fields such as a kind of instrument of fractured rock in the earth's crust, extensive use and oil, gas drilling and other mining probings.Further exploitation along with petroleum resources, the minable oil well quantity of conventional drilling is fewer and feweri, the difficulty of exploitation is increasing, adopt the oil well of unconventional drilling well exploitation more and more, directional well, inclined shaft, extended reach well, horizontal well, the special wells such as Multilateral Wells shared ratio in oil exploitation is increasing, thereby use the chance more time of mud motor longer, the combined drilling mode that is added turntable rotation by power drilling tool obtains using more and more widely, its feature is exactly that drill speed is enhanced, surpassed the 2-3 of former rotary drilling doubly, reach 250-300 rev/min.Based on this, require modern double containment rock bit must under high rotating speed, keep the long life-span, the number of times making a trip to reduce drilling well, reduces non-drilling time, improves drilling efficiency and reduces drilling cost.
At the rock bit great majority that use aspect oil, gas drilling and other mining drill spies, are seal form.Sealed roller cone drill bit mainly consists of bit leg, bit leg axle, gear wheel, gear wheel hole, locking element and seal.The key factor that affects the application life of rock bit in oil, gas drilling is to be bearing life and sealing life in the life-span of bearing arrangement.By dissect and analyze rock bit failure mode we find that be again the most direct restraining factors in its rock bit life-span sealing life.Along with the development of rock bit technology has produced double containment rock bit, the ability that this kind of drill bit adapts to high rotating speed high temperature is strong.Single sealing rock bit that double containment rock bit is compared in the past has two seals circle, and outer sealing ring is sand retaining ring, and inner sealing ring is primary seal circle, sand retaining ring protection primary seal circle, primary seal circle protection bearing.Double containment rock bit has improved the application life of rock bit.The life-span that we find to improve sand retaining ring along with the use of double containment rock bit is again the key of double containment drill bit.Because the faster mud that sand retaining ring damages and landwaste contact primary seal are faster, primary seal circle is shorter service time, and final bit life is shorter.For rock bit, its bearing seal and lubricated quality directly affect the life-span of rock bit.
Facts have proved: the size of sealing ring inside and outside differential pressure is on there being vital impact the application life of sealing ring.It is the fundamental cause of sealing leakage on the one hand, and on the other hand, pressure reduction is crossed conference and made seal unstable wear, causes rock bit sealing and the too early inefficacy of whole rock bit.In order to guarantee the quality of cone bit bearing and sealing, the pressure balance that current single sealing ring rock bit designs on bit leg and oil storage compensating device (seeing Fig. 6 structure), be used for the pressure differential of balancing drill bearing sealed ring both sides to compensation consumes in bearing bore lubricating grease.This pressure balance and oil storage compensating device are generally comprised of oil storage hole, long oil hole, plug pin hole, pressure transmission hole in a plurality of parts such as oil storage bag, lubricating cup, gland, back-up ring, sealing ring and bit leg.This structure is equally applicable to the bearing lubrication of double containment rock bit and the poor adjusting of external and internal pressure of primary seal circle, but the adjusting that the external and internal pressure that is not suitable for Double seal ring sand retaining ring is poor, reason is that primary seal circle has played iris action to the pressure balance designing on sand retaining ring 4 and bit leg and oil storage compensating device, the external and internal pressure that cannot be adjusted to sand retaining ring 4 is poor, if opening pressure balance and the oil storage compensating device that a hole is communicated on bit leg at sand retaining ring position is also infeasible, if rear mud landwaste can enter into bearing bore by the pressure balance on bit leg and oil storage compensating device because sand retaining ring 4 loses efficacy, cause bearing and primary seal circle to damage too early.The independent pressure equaliser that so needs pressure balance on a kind of and bit leg and oil storage compensating device to be independent of each other regulates sand retaining ring.
Utility model content
The purpose of this utility model is to overcome the deficiency of above-mentioned technology, and provide a kind of double containment rock bit with sealing load adjusting device, can regulate timely and effectively the inside and outside pressure differential of sand retaining ring, sand retaining ring is worked under less pressure reduction, extend the application life of sand retaining ring, thereby extend the life-span of rock bit.
The utility model for achieving the above object, by the following technical solutions: a kind of double containment rock bit with sealing load adjusting device, comprise gear wheel, bit leg and locking ball form, described locking ball is arranged between gear wheel and bit leg " R " groove, bit leg is connected with gear wheel by bit leg journel, gear wheel endoporus forms bearing seal chamber by seal and bit leg journel, described bearing seal chamber is connected with the pressure balance arranging on bit leg and oil storage compensating device, position near gear wheel axis hole opening is provided with two seal grooves, two seal grooves separate by the thick supporting baffle of 2～6mm, an elastic seal ring is set respectively in two seal grooves, outer sealing ring is sand retaining ring, inner sealing ring is primary seal circle, it is characterized in that: at gear wheel back cone position, be provided with pressure-regulating device, described pressure-regulating device comprises pressure transmission hole, little oil storage hole, little oil storage bag, little oil storage hole plug, described little oil storage hole is opened on the back cone position of described gear wheel, described pressure transmission hole is arranged in described supporting baffle bearing seal chamber and little oil storage hole is communicated with, described little oil storage bag is fixed in described little oil storage hole, described all the other face closures of little oil storage bag one end opening, little oil storage bag split shed position is towards bearing seal chamber, described little oil storage hole plug is fixed on described little oil storage bag sealing in described little oil storage hole, on described little oil storage hole plug centre position, have pressure transmission through hole.
Preferably, described little oil storage hole plug is pressed into by interference fit or the mode that is threaded is contained on little oil storage hole.
Preferably, described little oil storage hole plug will be lower than gear wheel back cone plane.
Preferably, the diameter of described pressure transmission hole is 2mm～4mm.
Preferably, little oil storage bag is made by acrylonitrile-butadiene rubber, highly saturated nitrile rubber, acrylate rubber or fluorubber material.
The beneficial effects of the utility model are: compared with prior art, the utility model double containment rock bit, at gear wheel back cone position, be provided with and pressure equaliser, thereby the pressure differential of effective balance sand retaining ring both sides, sand retaining ring is worked under less pressure reduction, improve the application life of sand retaining ring.Above-mentioned pressure equaliser consists of pressure transmission hole, little oil storage hole, little oil storage bag, little oil storage hole plug, and little oil storage hole is arranged on the gauge compact position of gear wheel back cone, is convenient to like this processing and pressure transmission.Because pressure transmission hole is opened the pressure reduction that can regulate timely like this sand retaining ring both sides at sand retaining ring position, make sand retaining ring in less pressure reduction work, thereby extend its life-span, finally make the life of rock bit, improve drilling efficiency and reduced drilling cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment drill bit;
Fig. 2 is the medium and small oil storage hole of the utility model embodiment drill bit and pressure transmission hole structural representation;
Fig. 3 is the medium and small oil storage bag schematic diagram of the utility model embodiment drill bit;
Fig. 4 is the medium and small oil storage hole plug of the utility model embodiment drill bit schematic diagram;
Fig. 5 is the supporting baffle side schematic view between sand retaining ring and primary seal circle;
Fig. 6 is the structural representation of double containment rock bit in prior art;
Fig. 7 is the schematic diagram after little oil storage bag and little oil storage hole plug are installed in little oil storage hole;
1, bit leg; 2, gear wheel; 3, primary seal circle; 4, sand retaining ring; 5, supporting baffle; 51, upper end; 52, lower end; 6, pressure transmission hole; 7, little oil storage hole; 8, little oil storage bag; 9, little oil storage hole plug; 10, hole; 11, locking steel ball; 12, oil storage hole; 13, oil storage bag; 14, oil storage cup; 15, gland; 16, jump ring; 17, long oil hole; 18, plug pin hole; 19, plug.
The specific embodiment
Below in conjunction with accompanying drawing and preferred embodiment, describe the specific embodiment of the present utility model in detail.As shown in the figure: a kind of double containment rock bit with sealing load adjusting device comprises gear wheel 2, bit leg 1, be provided with locking steel ball 11 between gear wheel axis hole and bit leg journel, bit leg is connected with gear wheel by bit leg journel.In the utility model, gear wheel endoporus relies on primary seal circle 3 and axle journal to match and forms bearing seal chamber, is provided with pressure balance and oil storage compensating device and is connected with bearing bore by long oil hole on bit leg 1.Described pressure balance and oil storage compensating device comprise the oil storage hole 12 being arranged on bit leg 1, and oil storage bag 13, oil storage cup 14, gland 15, jump ring 16 and plug 19 are installed in oil storage hole.Oil storage hole 12 is communicated with bearing bore by long oil hole 17 and plug pin hole 18, as shown in Figure 6.This structure can regulate the pressure differential of primary seal circle 3 both sides, but cannot regulate the pressure differential of its sand retaining ring 4 both sides.
We arrange a kind of pressure-regulating device at the position of gear wheel back cone for this reason, and this device can effectively regulate the pressure differential of sand retaining ring 4 both sides, and described pressure-regulating device comprises that pressure transmission hole 6, little oil storage hole 7, little oil storage bag 8, little oil storage hole plug 9 form.Described pressure transmission hole is arranged in described supporting baffle bearing seal chamber and little oil storage hole is communicated with, be that pressure transmission hole 6 will penetrate little oil storage hole 7 baseplanes and supporting baffle 5 sides but can not exceed the 51He lower end, upper end 52 of side, otherwise can damage sealing ring, the pressure that could effectively carry out like this sand retaining ring 4 regulates.Before boring pressure transmission hole 6, first get out a processing of being convenient to like this pressure transmission hole 6 perpendicular to the hole 10 of pressure transmission hole 6, process rear hole 10 in electricity consumption soldering.Pressure transmission hole 6 angles become 0 °～10 ° with gear wheel baseplane, length can be regulated by gear wheel matrix thickness.Described all the other face closures of little oil sac 8 one end openings, smear lubricating grease and opening towards gear wheel bearing bore in little oil sac during installation, this little oil sac wall thickness is 0.5mm～2mm, and outer contour shape is hemispherical, square, rectangle etc.Little oil storage bag 8 relies on little oil storage hole plug 9 that its sealing is fixed in little oil storage hole 7, as shown in Figure 7.On described little oil storage hole plug 9 centre positions, have 2mm～4mm aperture and be convenient to pressure transmission, little oil storage hole plug 9 is pressed into by interference fit or the mode that is threaded is contained in little oil storage hole 7, little oil storage hole plug 9 packs little oil storage hole 7 into will, lower than gear wheel back cone, prevent little oil storage hole plug 9 and wall friction after interior.
The operating principle of this pressure equaliser is for passing on little oil storage bag 8 when the shaft bottom ambient pressure aperture that pressure can be timely has on by little oil storage hole plug 9 during higher than sand retaining ring 4 inside pressure, make little oil storage bag 8 turn over fuel feeding to the inside, supplement the pressure of sand retaining ring 4 inner sides.When shaft bottom ambient pressure during lower than the pressure of sand retaining ring 4 inner sides little oil storage bag 8 turn over laterally and fit tightly with the inner cavity surface of little oil storage hole plug 9.Such reciprocating motion just can regulate the pressure differential of sand retaining ring 4 inside and outside both sides timely, and it is worked under less pressure reduction, has increased like this application life, and then has extended the application life of whole drill bit.
The above is only preferred embodiment of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (5)
1. the double containment rock bit with sealing load adjusting device, comprise gear wheel, bit leg and locking ball form, described locking ball is arranged between gear wheel and bit leg " R " groove, bit leg is connected with gear wheel by bit leg journel, gear wheel endoporus forms bearing seal chamber by seal and bit leg journel, described bearing seal chamber is connected with the pressure balance arranging on bit leg and oil storage compensating device, position near gear wheel axis hole opening is provided with two seal grooves, two seal grooves separate by the thick supporting baffle of 2～6mm, an elastic seal ring is set respectively in two seal grooves, outer sealing ring is sand retaining ring, inner sealing ring is primary seal circle, it is characterized in that: at gear wheel back cone position, be provided with pressure-regulating device, described pressure-regulating device comprises pressure transmission hole, little oil storage hole, little oil storage bag, little oil storage hole plug, described little oil storage hole is opened on the back cone position of described gear wheel, described pressure transmission hole is arranged in described supporting baffle bearing seal chamber and little oil storage hole is communicated with, described little oil storage bag is fixed in described little oil storage hole, described all the other face closures of little oil storage bag one end opening, little oil storage bag split shed position is towards bearing seal chamber, described little oil storage hole plug is fixed on described little oil storage bag sealing in described little oil storage hole, on described little oil storage hole plug centre position, have pressure transmission through hole.
2. the double containment rock bit with sealing load adjusting device according to claim 1, is characterized in that: described little oil storage hole plug is pressed into by interference fit or the mode that is threaded is contained on little oil storage hole.
3. the double containment rock bit with sealing load adjusting device according to claim 1 and 2, is characterized in that: described little oil storage hole plug will be lower than gear wheel back cone plane.
4. the double containment rock bit with sealing load adjusting device according to claim 3, is characterized in that: the diameter of described pressure transmission hole is 2mm～4mm.
5. the double containment rock bit with sealing load adjusting device according to claim 4, is characterized in that: little oil storage bag is made by acrylonitrile-butadiene rubber, highly saturated nitrile rubber, acrylate rubber or fluorubber material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320619436.XU CN203515327U (en) | 2013-10-08 | 2013-10-08 | Double-sealing roller bit with sealing pressure adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320619436.XU CN203515327U (en) | 2013-10-08 | 2013-10-08 | Double-sealing roller bit with sealing pressure adjusting device |
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| Publication Number | Publication Date |
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| CN203515327U true CN203515327U (en) | 2014-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320619436.XU Expired - Lifetime CN203515327U (en) | 2013-10-08 | 2013-10-08 | Double-sealing roller bit with sealing pressure adjusting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103470188A (en) * | 2013-10-08 | 2013-12-25 | 天津立林钻头有限公司 | Dual-seal cone bit with sealing pressure adjusting device |
-
2013
- 2013-10-08 CN CN201320619436.XU patent/CN203515327U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103470188A (en) * | 2013-10-08 | 2013-12-25 | 天津立林钻头有限公司 | Dual-seal cone bit with sealing pressure adjusting device |
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