CN102628338B - Novel roller bit sealing ring - Google Patents
Novel roller bit sealing ring Download PDFInfo
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- CN102628338B CN102628338B CN201110165109.7A CN201110165109A CN102628338B CN 102628338 B CN102628338 B CN 102628338B CN 201110165109 A CN201110165109 A CN 201110165109A CN 102628338 B CN102628338 B CN 102628338B
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Abstract
The invention discloses a novel roller bit sealing ring, which belongs to the field of bearing sealing. The novel roller bit sealing ring is disposed in a sealing groove between a bearing shaft hole and a tooth palm journal. Both ends of the sealing groove are respectively communicated with an inside lubricating oil channel and an outside drilling fluid channel. The novel roller bit sealing ring comprises a metal framework fixed in the sealing groove, the metal framework separates the sealing groove into a lubricating oil sealing groove communicated with the inside lubricating oil channel and a drilling fluid sealing groove communicated with the outside drilling fluid channel. A lubricating oil sealing part is disposed in the lubricating oil sealing groove and completely seals and separates the inside lubricating oil channel together with the metal framework. A drilling fluid sealing part is disposed in the drilling fluid sealing groove and completely seals and separates the outside drilling fluid channel together with the metal framework. The novel roller bit sealing ring is more suitable for severe environment of drilling work, and capable of more effectively and simultaneously separating lubricating oil and drilling fluid, rock debris and the like. Separation of lubricating oil and separation of drilling fluid do not affect each other, and service life of a sealing device is prolonged.
Description
Technical field
The invention belongs to bearing seal field, relate in particular to for oil or geological drilling cone bit bearing and seal.
Background technology
The life-span of rock bit depends primarily on the life-span of bit bearing, and the life-span of bearing relies on the life-span of sealing to a great extent, and Hughes Electronics of the U.S. predicts bit life according to sealing reliability exactly.The current development trend of rock bit is rotating speed high speed, and work condition environment is also more and more severe, particularly oil drilling, and along with drilling depth is more and more darker, the vulnerability of this link of plain bearing sealing ring is more and more outstanding.
The function of bit bearing sealing is to separate bearing and shaft bottom drilling fluid, does not allow shaft bottom drilling fluid, landwaste etc. enter bearing, also wants retainer shaft bearing lubrication oil not leak simultaneously, thereby ensures the application life of drill bit.
The inefficacy of cone bit bearing sealing is mainly friction, the wearing and tearing of sealing contact surface, and the operating mode of rugged environment day by day that now cone bit bearing bears more and more cannot meet bearing seal to isolate the requirement of drilling fluid, landwaste etc. and lubrication oil simultaneously: the pressure of bottom pressure and bearing lubricant is all very high, and in running, both pressure is also often difficult to balance, contact condition and contact position in seal between the two are easily changed, impact sealing; The fluctuation that circulating fluid causes bottom pressure, also makes contact condition and the contact position generation respective change of seal; In drilling fluid, contain the tempering property media such as a large amount of solid particles, these materials easily enter in sealing ring, greatly aggravate the wearing and tearing of seal, and even directly cause seal failure.These factors all can be aggravated the wearing and tearing of seal, and accelerate the degraded of rubber parts.
Conventional rock bit seal form now, O-ring seals material selection high performance hydrogenated nitrile-butadiene rubber for its oil drilling, it has high temperature resistant (under 150 DEG C of conditions, can use for a long time), the Korrosionsmediums such as resistance to hydrogen sulfide, steam, well compression set ability, the higher advantage such as stretching and tearing strength.But the skin-friction coefficient of rubber is very large, and will play sealing function, must have larger interference with component, therefore under bearing High Rotation Speed condition, frictional resistance is large, rises heat high, and wearing and tearing and aging phenomenon are serious, cannot ensure the application life of bearing.Follow-on seal form has also occurred multiple in succession, and as dosed PTFE and molybdenum bisuphide etc. in rubber, though can suitably reduce the friction factor of rubber, frictional resistance is appointed very large, and movable sealing is also undesirable, is still difficult to meet the requirement of bearing life.Some other as increase metal movable sealing structure etc. also has various shortcomings, is therefore difficult to the requirement in application life that reaches desirable.
Summary of the invention
The technical problem to be solved in the present invention is: the problem existing for prior art, a kind of adverse circumstances that can be more suitable for drilling well work are proposed, more effectively while isolation lubricating oil and drilling fluid, landwaste etc., both are independent of each other, and extend the cone bit bearing sealing of seal life.
The object of the invention realizes by following technical proposals:
A kind of rock bit sealing ring, it is located in the seal groove between gear wheel axis hole and bit leg journel, described seal groove two ends are communicated with respectively internal lubrication oil passage and outside drilling fluid passage, comprise the metallic framework being fixed in described seal groove, sealing groove is separated into the seal oil groove that is communicated with internal lubrication oil passage and the drilling fluid seal groove that is communicated with outside drilling fluid passage by described metallic framework, in described seal oil groove, be provided with seal oil part, its complete internal lubrication oil passage described in seal isolation together with metallic framework, in described drilling fluid seal groove, be provided with drilling fluid seal, its complete outside drilling fluid passage described in seal isolation together with metallic framework.
As optimal way, described seal oil part one side static seal gear wheel axis hole inner face, another side movable sealing bit leg journel axial plane.As optimal way, described seal oil part is made up of the elasticity static seal of static seal gear wheel axis hole inner face and the dynamic radial seal part of movable sealing bit leg journel axial plane, and described dynamic radial seal part is made up of filled polytetrafluoroethylene.
As optimal way, described seal oil part forms by the dynamic radial seal part of movable sealing bit leg journel axial plane with by fixture fixing to itself and metallic framework, and described dynamic radial seal part is made up of filled polytetrafluoroethylene.
As optimal way, described seal oil part is high pressure rubber oil sealing.
Further, the movable sealing contact surface of described seal is provided with the first helicla flute, and its rotation direction is contrary with the rotation direction of bit leg journel.
As optimal way, described drilling fluid seal one side movable sealing bit leg journel end face.As optimal way, described drilling fluid seal is made up of the end face dynamic seal of movable sealing bit leg journel end face and the resilient infill of filling between end face dynamic seal and metallic framework, and described end face dynamic seal is made up of filled polytetrafluoroethylene.
Further, the movable sealing contact surface of described seal is provided with the second helicla flute, and its rotation direction is contrary with the rotation direction of bit leg journel.As optimal way, the movable sealing contact surface outside of described seal is the plane of smooth bit leg journel end face.
The course of work is: the gap between gear wheel axis hole and bit leg journel inevitably forms grease channel and drilling fluid passage, internal lubrication oil can enter seal groove by grease channel thus, outside drilling fluid, landwaste can enter seal groove by drilling fluid passage, and metallic framework is by seal oil part and the isolation of drilling fluid seal, and form two independently to lubrication oil and drilling fluid with both respectively simultaneously, the shielding system of landwaste: skeleton has enough rigidity to bear the pressure that inside and outside produces, can equilibrium pressure and keep the stable of the seal oil part of both sides and drilling fluid seal, lubrication oil is isolated completely by seal oil part, metallic framework, and has completely cut off the impact of lubricating oil pressure on drilling fluid seal, drilling fluid is isolated completely by drilling fluid seal, metallic framework, and has completely cut off drilling liquid pressure, the impact of landwaste on seal oil part.
Beneficial effect of the present invention: conventional seals mode mainly adopts single O shape to enclose to seal, this O shape circle is wanted sealed bearing internal lubrication oil, sealed external drilling fluid and landwaste etc. again, application life is very low.Substituted by some modifieds gradually now, comprising making static seal with O type circle, movable sealing adopts high-accuracy metal sealing, its sealing load encloses from O shape, but there is pressure reduction in internal lubrication oil and outside drilling fluid, and constantly change, same O shape circle bears inside and outside differential pressure simultaneously, therefore the decrement to O shape circle etc. has very accurate requirement, technique guarantee difficulty, and pair of metal pair of friction components seal inside and outside medium simultaneously, and sealing is affected, lubrication oil easily runs off, therefore the application life of bearing is still not very good.And advantage of the present invention is:
1, by inside and outside medium by two groups of sealings separately, avoided influencing each other of external and internal pressure: can meet the isolation completely to lubrication oil and drilling fluid, landwaste simultaneously, avoid that external and internal pressure is poor, the impact on sealing device such as bottom hole pressure surge, reduce wear, be more suitable for the harsh working environments such as drilling well; Cleverly radial seal and end face seal are combined, can reach optimal seal effect.
2, the pressure that elasticity static seal and resilient infill increase lubrication oil, drilling fluid by self sealss principle passes on adjacent dynamic seal, the sealing pressure that makes dynamic seal is all the time higher than the pressure of external agency, no matter how pressure medium changes, no matter be static or dynamic, can ensure sealing.Meanwhile, due to elasticity static seal and resilient infill not with bit leg journel generation dynamic friction, therefore there are not wearing and tearing, also meet the demands completely its application life.
3, filled polytetrafluoroethylene heat-resisting quantity is much better than rubber, can long-term work under the condition of 270 DEG C, and resistance to various corrosivity is all very good, and abrasion resistance is good, and its friction factor, compared with much lower times of rubber, has self lubricity simultaneously, not easy to wear in the time of movable sealing.The combination of elasticity static seal/resilient infill and dynamic seal, the favorable elasticity of elastic component has ensured the lasting sealing effectiveness reliably of filled polytetrafluoroethylene on the one hand, the superperformance of filled polytetrafluoroethylene has ensured to have ensured again the life-span of elastic component sealing life, and both perfect cooperations make sealing device reach best sealing effectiveness and the life-span.
4, its rotation direction of the first helicla flute of seal oil part and the direction of rotation of bit leg journel are anti-, can play good pump and inhale effect, can be by inside the lubrication oil leaking in rotary course pump pressure, thus play the effect of sealing.Simultaneously, because bit leg journel lubrication oil in rotary course forms the oil film that one deck is very thin between bit leg journel and seal always, therefore large radian has reduced the friction factor between seal and axle, makes frictional heat little, the wearing and tearing of seal are also very little, greatly extend its application life.
5, the second helicla flute of drilling fluid seal plays good pump suction effect equally, helicla flute is by outside the drilling fluid that enters into seal contact surface pumping, and outside is complete plane, with the laminating of bit leg journel end face, stop the solid particles such as landwaste to enter sealing surface all the time.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention 1;
Fig. 2 is the structural representation of dynamic seal radially in the embodiment of the present invention 1;
Fig. 3 is the structural representation of end face dynamic seal in the embodiment of the present invention 1;
Fig. 4 is the structural representation of the embodiment of the present invention 2;
Fig. 5 is the structural representation of the embodiment of the present invention 3.
Detailed description of the invention
Following non-limiting examples is used for illustrating the present invention:
As shown in Figure 1 to Figure 3, a kind of rock bit sealing ring, it is located at the seal groove interior 3 between gear wheel axis hole 1 and bit leg journel 2, described seal groove two ends are communicated with respectively internal lubrication oil passage 4 and outside drilling fluid passage 5, comprise the metallic framework 6 being fixed in described seal groove 3, sealing groove 3 is separated into the seal oil groove that is communicated with internal lubrication oil passage 4 and the drilling fluid seal groove that is communicated with outside drilling fluid passage 5 by described metallic framework 6, in described seal oil groove, be provided with seal oil part, its complete internal lubrication oil passage 4 described in seal isolation together with metallic framework 6, in described drilling fluid seal groove, be provided with drilling fluid seal, its complete outside drilling fluid passage 5 described in seal isolation together with metallic framework 6.As shown in the present embodiment is preferred, endless metal skeleton 6 cross sections are " Z " shape, be fixed on gear wheel axis hole 1, in the present embodiment, the large annulate shaft face of " Z " shape structure is close to gear wheel axis hole 1 inwall interference fit, fitting face can be coated with refractory seals glue, can seal inside and outside medium completely, " Z " shape metallic framework 6 is adjacent to bit leg journel 2 axial planes by seal oil part on the one hand, seal oil part is close to the large ring inner peripheral surface of " Z " shape metallic framework 6 to realize the static seal to gear wheel axis hole 1 inner face simultaneously, on the other hand drilling fluid seal is adjacent to bit leg journel 2 end faces.Described seal oil part one side static seal gear wheel axis hole 1 inner face, another side movable sealing bit leg journel 2 axial planes.As shown in the present embodiment is preferred, described seal oil part is made up of the elasticity static seal 7 of static seal gear wheel axis hole 1 inner face and the dynamic radial seal part 8 of movable sealing bit leg journel 2 axial planes, elasticity static seal 7 adopts rubber rectangular ring, its material selection hydrogenated nitrile-butadiene rubber, assembling radial compression amount generally selects 15～20%, described dynamic radial seal part 8 is an annular element, its cross section is L-shaped, sagittal plane is sandwiched between elasticity static seal 7 rubber rectangular rings and the middle end face of " Z " shape metallic framework 6, axial vane surface is sealing lip, be pressed under elasticity static seal 7 rubber rectangular rings, dynamic radial seal part 8 is made up of filled polytetrafluoroethylene, preferably ultra-fine fibre glass is as filler, can make polytetrafluoroethylene (PTFE) possess good elasticity, and dynamic radial seal part 8 sealing lips are by elasticity static seal 7 rubber seal radial compactions, the large radian of followability of sealing lip is improved, can meet the circular runout of 0.5 left and right of existence conventionally of gear wheel bearing.The movable sealing contact surface of described dynamic radial seal part 8 is provided with the first helicla flute 9, and its rotation direction is contrary with the rotation direction of bit leg journel 2.Described drilling fluid seal one side movable sealing bit leg journel 2 end faces.As optimal way, described drilling fluid seal is made up of the end face dynamic seal 10 of movable sealing bit leg journel 2 end faces and the resilient infill 11 of filling between end face dynamic seal 10 and metallic framework 6, the annular ring that described end face dynamic seal 10 is made up of filled polytetrafluoroethylene, preferably dose organosilicon and graphite etc., the preferred square type hydrogenated nitrile-butadiene rubber sealing ring of resilient infill 11, from rubber ring self sealss, in the time that extraneous drilling fluid pressure increases, the also corresponding increase of the axial pressure of sealing ring, the sealing load that has ensured end face dynamic seal 10 and rubber ring is all the time higher than the pressure of sealing medium.The movable sealing contact surface of described end face dynamic seal 10 is provided with the second helicla flute 12, and its rotation direction is contrary with the rotation direction of bit leg journel 2.The movable sealing contact surface outside 13 of described end face dynamic seal 10 is the plane of smooth bit leg journel 2 end faces.The situation lower seal that the present embodiment sealing device can lose efficacy at whole gear wheel not lose efficacy, thereby farthest ensured the application life of gear wheel, and sealing device can meet axle fitting face rotational line speed and reach the high speed gear wheel sealing of 5m/s.
As shown in Figure 4, in the present embodiment, when lubricating oil pressure is less than under the working condition of 1MPa, structure can suitably be adjusted, described seal oil part forms by the dynamic radial seal part 14 of movable sealing bit leg journel 2 axial planes with by fixture fixing to itself and metallic framework 6, fixture is made up of metal fixing 15 and rubber sheet gasket 16, make metal fixing 15 compress dynamic radial seal part 14 by metallic framework 6 crimpings, when metallic framework 6 crimping by metal fixing 15 and dynamic radial seal part 14 by strength transmission to rubber sheet gasket 16, make it produce compression, the salable lubrication oil from seepage between metal fixing 15 and rubber sheet gasket 16.Described dynamic radial seal part 14 is made up of filled polytetrafluoroethylene, and similarly, the movable sealing contact surface of described seal is respectively equipped with first and second helicla flute 9,12, and its rotation direction is contrary with the rotation direction of bit leg journel 2, and other are also identical with embodiment 1.
As shown in Figure 5, in the present embodiment, when lubricating oil pressure is less than under the working condition of 1MPa, structure can suitably be adjusted, and described seal oil part is conventional high pressure rubber oil sealing 17, is made up of rubber, and other are identical with embodiment 1.High pressure rubber oil sealing 17 is a kind of high voltage bearing oil enveloping structures, and this class formation uses in a large number at other field.The object of herein mentioning is to show inside and outside every all to adopt hydrodynamic seal principle and all should be subject to patent protection with the similar combination sealing mode of the present invention.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. a rock bit sealing ring, it is located in the seal groove between gear wheel axis hole and bit leg journel, described seal groove two ends are communicated with respectively internal lubrication oil passage and outside drilling fluid passage, it is characterized in that: comprise the metallic framework being fixed in described seal groove, sealing groove is separated into the seal oil groove that is communicated with internal lubrication oil passage and the drilling fluid seal groove that is communicated with outside drilling fluid passage by described metallic framework, in described seal oil groove, be provided with seal oil part, its complete internal lubrication oil passage described in seal isolation together with metallic framework, in described drilling fluid seal groove, be provided with drilling fluid seal, its complete outside drilling fluid passage described in seal isolation together with metallic framework, described seal oil part one side static seal gear wheel axis hole inner face, another side movable sealing bit leg journel axial plane, described seal oil part is made up of the elasticity static seal of static seal gear wheel axis hole inner face and the dynamic radial seal part of movable sealing bit leg journel axial plane, and described dynamic radial seal part is made up of filled polytetrafluoroethylene.
2. a rock bit sealing ring, it is located in the seal groove between gear wheel axis hole and bit leg journel, described seal groove two ends are communicated with respectively internal lubrication oil passage and outside drilling fluid passage, it is characterized in that: comprise the metallic framework being fixed in described seal groove, sealing groove is separated into the seal oil groove that is communicated with internal lubrication oil passage and the drilling fluid seal groove that is communicated with outside drilling fluid passage by described metallic framework, in described seal oil groove, be provided with seal oil part, its complete internal lubrication oil passage described in seal isolation together with metallic framework, in described drilling fluid seal groove, be provided with drilling fluid seal, its complete outside drilling fluid passage described in seal isolation together with metallic framework, described seal oil part forms by the dynamic radial seal part of movable sealing bit leg journel axial plane with by fixture fixing to itself and metallic framework, and described dynamic radial seal part is made up of filled polytetrafluoroethylene.
3. a rock bit sealing ring, it is located in the seal groove between gear wheel axis hole and bit leg journel, described seal groove two ends are communicated with respectively internal lubrication oil passage and outside drilling fluid passage, it is characterized in that: comprise the metallic framework being fixed in described seal groove, sealing groove is separated into the seal oil groove that is communicated with internal lubrication oil passage and the drilling fluid seal groove that is communicated with outside drilling fluid passage by described metallic framework, in described seal oil groove, be provided with seal oil part, its complete internal lubrication oil passage described in seal isolation together with metallic framework, in described drilling fluid seal groove, be provided with drilling fluid seal, its complete outside drilling fluid passage described in seal isolation together with metallic framework, described seal oil part is high pressure rubber oil sealing, described drilling fluid seal one side movable sealing bit leg journel end face, described drilling fluid seal is made up of the end face dynamic seal of movable sealing bit leg journel end face and the resilient infill of filling between end face dynamic seal and metallic framework, and described end face dynamic seal is made up of filled polytetrafluoroethylene.
4. a kind of rock bit sealing ring as claimed in claim 1 or 2, is characterized in that: the movable sealing contact surface of described seal oil part is provided with the first helicla flute, and its rotation direction is contrary with the rotation direction of bit leg journel.
5. a kind of rock bit sealing ring as claimed in claim 1 or 2, is characterized in that: described drilling fluid seal one side movable sealing bit leg journel end face.
6. a kind of rock bit sealing ring as claimed in claim 5, it is characterized in that: described drilling fluid seal is made up of the end face dynamic seal of movable sealing bit leg journel end face and the resilient infill of filling between end face dynamic seal and metallic framework, and described end face dynamic seal is made up of filled polytetrafluoroethylene.
7. a kind of rock bit sealing ring as claimed in claim 5, is characterized in that: the movable sealing contact surface of described drilling fluid seal is provided with the second helicla flute, and its rotation direction is contrary with the rotation direction of bit leg journel.
8. a kind of rock bit sealing ring as claimed in claim 7, is characterized in that: the plane that the movable sealing contact surface outside of described drilling fluid seal is smooth bit leg journel end face.
9. a kind of rock bit sealing ring as claimed in claim 6, is characterized in that: the movable sealing contact surface of described drilling fluid seal is provided with the second helicla flute, and its rotation direction is contrary with the rotation direction of bit leg journel.
10. a kind of rock bit sealing ring as claimed in claim 9, is characterized in that: the plane that the movable sealing contact surface outside of described drilling fluid seal is smooth bit leg journel end face.
11. a kind of rock bit sealing rings as claimed in claim 3, is characterized in that: the movable sealing contact surface of described drilling fluid seal is provided with the second helicla flute, and its rotation direction is contrary with the rotation direction of bit leg journel.
12. a kind of rock bit sealing rings as claimed in claim 11, is characterized in that: the plane that the movable sealing contact surface outside of described drilling fluid seal is smooth bit leg journel end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110165109.7A CN102628338B (en) | 2011-06-20 | 2011-06-20 | Novel roller bit sealing ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110165109.7A CN102628338B (en) | 2011-06-20 | 2011-06-20 | Novel roller bit sealing ring |
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| CN102628338A CN102628338A (en) | 2012-08-08 |
| CN102628338B true CN102628338B (en) | 2014-06-11 |
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| CN201110165109.7A Active CN102628338B (en) | 2011-06-20 | 2011-06-20 | Novel roller bit sealing ring |
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| DE102012102834A1 (en) * | 2012-03-08 | 2013-09-12 | Endress + Hauser Gmbh + Co. Kg | Sealing ring and pressure transducer with at least one such sealing ring |
| US10458186B2 (en) | 2013-09-10 | 2019-10-29 | Halliburton Energy Services, Inc. | Sacrificial spacer for well tool inner seal |
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| CN108533178A (en) * | 2018-04-03 | 2018-09-14 | 西南石油大学 | Rock bit tooth form sealing structure |
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| CN108487863B (en) * | 2018-05-22 | 2023-07-04 | 西南石油大学 | Drill bit with torsional impact function |
| CN108442879B (en) * | 2018-05-22 | 2023-07-04 | 西南石油大学 | Split drill bit with axial impact function |
| CN108360979B (en) * | 2018-05-22 | 2023-07-14 | 西南石油大学 | Split single-cone bit |
| CN112797079B (en) * | 2021-01-29 | 2022-06-07 | 长沙鑫航机轮刹车有限公司 | Oil deflector ring in airplane wheel and oil deflector ring assembly thereof |
| CN113819048A (en) * | 2021-10-22 | 2021-12-21 | 江西立新机液化设备制造有限公司 | Structure suitable for automatic compensation seal abrasion clearance of high pressure water plunger pump |
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| CA2025853C (en) * | 1989-11-02 | 1996-08-13 | Theodore R. Dysart | Double seal with lubricant gap between seals for sealed rotary drill bits |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5360076A (en) * | 1992-04-03 | 1994-11-01 | Hughes Tool Company | Dual metal face seal with single recessed energizer |
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| US4176848A (en) * | 1978-06-30 | 1979-12-04 | Dresser Industries, Inc. | Rotary bearing seal for drill bits |
| CA2025853C (en) * | 1989-11-02 | 1996-08-13 | Theodore R. Dysart | Double seal with lubricant gap between seals for sealed rotary drill bits |
| US6045029A (en) * | 1993-04-16 | 2000-04-04 | Baker Hughes Incorporated | Earth-boring bit with improved rigid face seal |
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