CN201581810U - Sealed roller cone drill bit with pressure balancing device - Google Patents
Sealed roller cone drill bit with pressure balancing device Download PDFInfo
- Publication number
- CN201581810U CN201581810U CN2009202519188U CN200920251918U CN201581810U CN 201581810 U CN201581810 U CN 201581810U CN 2009202519188 U CN2009202519188 U CN 2009202519188U CN 200920251918 U CN200920251918 U CN 200920251918U CN 201581810 U CN201581810 U CN 201581810U
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Abstract
The utility model relates to the field of petroleum and geological drilling machinery, in particular to a sealed roller cone drill bit with a pressure balancing device, which comprises a roller bit and a roller cone; the roller bit is connected with the roller cone through a journal on the lower end; the inner hole of the roller cone is matched with the journal through a sealing piece to form a bearing cavity; the bearing cavity is communicated with a long oil hole of a pressure balancing and oil storage compensating device arranged on the roller bit; and the roller cone is provided with the pressure balancing device which is communicated with the bearing cavity. The sealed roller cone drill bit with the pressure balancing device can effectively balance the pressure balancing device of a roller cone drill bit bearing of the pressure difference of both sides of the sealing piece, so that the pressure difference of both sides of the roller cone drill bit sealing piece gets equal, so as to prolong the service life of the roller cone drill bit bearing sealing and the whole drill bit.
Description
Technical field
The utility model relates to a kind of oil, geological drilling mechanical field of being used for, and particularly relates to a kind of sealed rock bit with pressure equaliser.
Background technology
Rock bit is one of important instrument that uses in oil, the geological drilling process, and the quality of its quality directly influences the speed and the cost of drilling well.For rock bit, its bearing seal and lubricated quality can directly influence the application life of rock bit.Facts have proved: the size of the inside and outside differential pressure of bearing seal has fundamental influence to the life-span of bearing seal.It is the fundamental cause of sealing leakage on the one hand, and on the other hand, the pressure reduction conference makes seal aggravation wearing and tearing, causes rock bit sealing and whole drill bit premature failure.In order to make cone bit bearing can guarantee good quality, existing rock bit on bit leg all design pressure balance and oil storage compensation device (see figure 5) are arranged, be used for the pressure differential on balance bit bearing sealing two sides and the lubricating grease that compensation consumes in bearing bore.Existing pressure balance and oil storage compensation device generally are made up of oil storage hole, long oil hole, plug pin hole, pressure transmission hole on a plurality of parts such as oil storage bag, lubricating cup, gland, back-up ring, sealing ring and the bit leg.But this pressure balance and oil storage compensation device distance between bearing seal are too far away, and pressure will pass to seal by the radial clearance of long oil hole, plug pin hole and bearing, and the space of transmitting pressure is not only long but also little.Usually the bearing grease ratio of viscosities of drill bit is higher, and therefore, this pressure balance and oil storage compensation device sensitivity and reliability aspect the equalizer bearing inside and outside differential pressure is all poor.
In recent years,, all on bit leg, try every possible means though on the defective of above-mentioned existence, done different improvement in the industry, such structure more complicated, realizability, reliability and practical value are poor.
The utility model content
The purpose of this utility model aims to provide a kind of sealed rock bit with pressure equaliser, the technical problem that it solves is a kind of simple in structure, the pressure reacting condition sensitivity that is installed on the gear wheel that designs at the deficiency of prior art existence, the pressure equaliser of the cone bit bearing of energy active balance seal pressure at both sides difference, make rock bit seals pressure at both sides difference be tending towards equal, thereby improve the application life of cone bit bearing sealing, and then the application life of improving whole drill bit.
For realizing that the purpose of this utility model adopts following technical scheme: a kind of sealed rock bit with pressure equaliser, it is characterized in that: it comprises bit leg, gear wheel; Bit leg is connected with gear wheel by the axle journal of its lower end, the gear wheel endoporus relies on seal and the axle journal formation bearing bore that matches, the pressure balance that is provided with on its bearing bore and the bit leg and the long oil hole of oil storage compensation device are connected, and gear wheel is provided with the pressure equaliser that is connected with bearing bore.
Above-mentioned pressure equaliser is by the logical hole of pressing, and pressure transmission elastic body and the logical hole plug of pressing are formed; The logical hole of pressing is located on the gear wheel wheel wall, and at the logical fixedly pressure transmission elastic body of pressing in the hole, the pressure transmission elastic body will lead to presses the hole sealing, and the logical hole plug of pressing is fixed on logical the pressure in the hole with the pressure transmission elastic body.
Logical press the hole to be located at gear wheel carbide button position and on cone outer row tooth position.
Described pressure transmission elastic body one end opening, the other end are sealing hemisphere, and opening is towards the gear wheel bearing bore.
Described logical pressure hole plug is installed in logical gear wheel surface one side of pressing the hole by interference fit or the mode that is threaded.
Above-mentioned pressure equaliser is mounted on the close gear wheel of associated sealing arrangement for bearings.
The beneficial effects of the utility model are:
1, because the close bearing seal position of this pressure equaliser, to the pressure reacting condition sensitivity inside and outside the bearing, can effectively reduce the pressure differential on bearing seal both sides, can further strengthen the reliability of bearing seal, prolong the application life of bearing seal, thereby prolong the application life of rock bit, reduce drilling cost.
2, this device is fit to the bearing of the various seals style of rock bit.
3, this apparatus structure is simple, at the bottom of the manufacturing cost, is convenient to make and installs.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is for offering logical position and structural representation of pressing the hole on gear wheel among embodiment of the utility model;
Fig. 3 is a logical structural representation of pressing the hole plug among embodiment of the utility model;
Fig. 4 is the elastomeric structure enlarged diagram of pressure transmission among embodiment of the utility model;
Fig. 5 is pressure balance and oil storage compensation device schematic diagram in the existing rock bit.
The specific embodiment
Further specify embodiment of the present utility model below in conjunction with accompanying drawing.
Bit leg 1 is connected with gear wheel 2 by the axle journal of its lower end, the gear wheel endoporus relies on sealing device 7 and the axle journal formation bearing bore that matches, bit leg 1 is provided with pressure balance and the oil storage compensation device is connected with bearing bore by the long oil hole, described pressure balance and oil storage compensation device comprise the oil storage hole 8 that is located on the bit leg 1, and oil storage bag 9, oil storage cup 10, gland 11, jump ring 12 and plug 15 are installed in the oil storage hole.Oil storage hole 8 is by long oil hole 13 and plug pin hole 14 and bearing bore conducting, as shown in Figure 5.Near on the gear wheel of associated sealing arrangement for bearings a bearing pressure bascule is being set again, described pressure equaliser comprises the logical hole 6 of pressing, it is arranged on gear wheel carbide button position and on cone outer row tooth position, the guide hole diameter design that links to each other with bearing bore is at 2～5mm, and length can be regulated arbitrarily according to the gear wheel wall thickness.The logical pressure installed pressure transmission elastic body 5 in the hole 6.
Described pressure transmission elastic body one end opening, the other end are sealing hemisphere, and opening is towards the gear wheel bearing bore during installation, and this elastic body wall thickness is designed to 0.5～1.5mm.This elastic body relies on the logical hole plug 4 of pressing that its sealing and fixing is pressed in the hole 6 logical, and above-mentioned logical pressure hole plug 4 is installed in logical gear wheel surface one side of pressing hole 6 by interference fit or the mode that is threaded.Should logically press the diameter of hole plug interstitial hole is 1～5mm.When this pressure equaliser was higher than gear wheel bearing chamber pressure when ambient pressure, pressure can in time pass to pressure transmission elastic body 5 by the logical hole plug interstitial hole of pressing, and pressure transmission elastic body 5 is turned over to the inside, replenishes gear wheel bearing chamber pressure.When ambient pressure was lower than gear wheel bearing chamber pressure, pressure transmission elastic body 5 can turn over laterally, fitted with the logical concave surface of hole plug 4 of pressing.Such reciprocating motion is the balance and the pressure differential of regulating the inside and outside both sides of sealing device timely and effectively just.
Rock bit described in the utility model can be single-cone rotary drill bit or polydonita wheel drill bit, and polydonita wheel drill bit is generally tricone bit, and the bearing bore of each palm of roller bits all can be provided with described bearing pressure bascule relatively in polydonita wheel drill bit.
The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from 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 (7)
1. sealed rock bit with pressure equaliser, its feature exists: comprise bit leg (1), gear wheel (2); Bit leg (1) is connected with gear wheel (2) by the axle journal of its lower end, gear wheel (2) endoporus relies on seal (7) and the axle journal formation bearing bore that matches, its bearing bore goes up the pressure balance of setting with bit leg (1) and the long oil hole of oil storage compensation device is connected, and gear wheel (2) is provided with the pressure equaliser that is connected with bearing bore.
2. the sealed rock bit of band pressure equaliser according to claim 1 is characterized in that: above-mentioned pressure equaliser is by the logical hole (6) of pressing, and pressure transmission elastic body (5) and the logical hole plug (4) of pressing are formed; The logical hole (6) of pressing is located on gear wheel (2) the wheel wall, and at the logical fixedly pressure transmission elastic body (5) of pressing in the hole (6), pressure transmission elastic body (5) will lead to pressure hole (6) and seal.
3. the sealed rock bit of band pressure equaliser according to claim 2 is characterized in that: described logical pressure hole (6) is located on the gear wheel carbide button position.
4. the sealed rock bit of band pressure equaliser according to claim 2 is characterized in that: described logical pressure hole (6) is located on the cone outer row tooth position.
5. the sealed rock bit of band pressure equaliser according to claim 2 is characterized in that: described pressure transmission elastic body (5) one end openings, the other end are sealing hemisphere, and opening is towards the gear wheel bearing bore.
6. the sealed rock bit of band pressure equaliser according to claim 2 is characterized in that described in the logical surperficial side of gear wheel of pressing the logical pressure hole plug (4) that plays fixedly pressure transmission elastic body (5) effect in the hole (6) to be installed in logical pressure hole (6) by interference fit or the mode that is threaded.
7. according to the sealed rock bit of any described band pressure equaliser in the claim 1 to 6, it is characterized in that: above-mentioned pressure equaliser is mounted on the close gear wheel of associated sealing arrangement for bearings (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202519188U CN201581810U (en) | 2009-12-22 | 2009-12-22 | Sealed roller cone drill bit with pressure balancing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202519188U CN201581810U (en) | 2009-12-22 | 2009-12-22 | Sealed roller cone drill bit with pressure balancing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201581810U true CN201581810U (en) | 2010-09-15 |
Family
ID=42723808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202519188U Expired - Fee Related CN201581810U (en) | 2009-12-22 | 2009-12-22 | Sealed roller cone drill bit with pressure balancing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201581810U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104806167A (en) * | 2014-01-23 | 2015-07-29 | 山东天工岩土工程设备有限公司 | Roller bit with brand-new structure |
| CN107740679A (en) * | 2017-10-06 | 2018-02-27 | 西南石油大学 | A kind of coiled tubing drilling combination sealing drill bit |
| WO2020134912A1 (en) * | 2018-12-28 | 2020-07-02 | 湖北鸣利来合金钻具股份有限公司 | Roller-cone bit capable of switching between sealed and unsealed state and switching method |
-
2009
- 2009-12-22 CN CN2009202519188U patent/CN201581810U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104806167A (en) * | 2014-01-23 | 2015-07-29 | 山东天工岩土工程设备有限公司 | Roller bit with brand-new structure |
| CN107740679A (en) * | 2017-10-06 | 2018-02-27 | 西南石油大学 | A kind of coiled tubing drilling combination sealing drill bit |
| WO2020134912A1 (en) * | 2018-12-28 | 2020-07-02 | 湖北鸣利来合金钻具股份有限公司 | Roller-cone bit capable of switching between sealed and unsealed state and switching method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20161222 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |