CN111456635A - double-W-shaped combined metal sealing structure for roller bit - Google Patents
double-W-shaped combined metal sealing structure for roller bit Download PDFInfo
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- CN111456635A CN111456635A CN202010241346.6A CN202010241346A CN111456635A CN 111456635 A CN111456635 A CN 111456635A CN 202010241346 A CN202010241346 A CN 202010241346A CN 111456635 A CN111456635 A CN 111456635A
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- 238000007789 sealing Methods 0.000 title claims abstract description 200
- 239000002184 metal Substances 0.000 title claims abstract description 24
- 230000003068 static effect Effects 0.000 claims abstract description 88
- 239000002131 composite material Substances 0.000 claims 2
- 230000009977 dual effect Effects 0.000 claims 2
- 239000007788 liquid Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 239000004519 grease Substances 0.000 description 6
- 230000001050 lubricating effect Effects 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 3
- 230000009545 invasion Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/08—Roller bits
- E21B10/22—Roller bits characterised by bearing, lubrication or sealing details
- E21B10/25—Roller bits characterised by bearing, lubrication or sealing details characterised by sealing details
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sealing Devices (AREA)
Abstract
The roller bit is a double-W-shaped combined metal sealing structure, and the dynamic sealing ring is positioned at the top of the sealing cavity, is in interference fit with an inner hole of the roller and rotates along with the roller; the sealing cavity is enclosed by a cone inner hole and the root part of a cone leg shaft neck; the dynamic sealing ring and the static sealing ring rotate relatively, and the end surfaces of the dynamic sealing ring and the static sealing ring are matched with each other to form a dynamic sealing surface; an outer rectangular groove is formed in the outer cylindrical surface of the upper portion of the static sealing ring, an outer W-shaped rubber ring is embedded into the outer rectangular groove, the opening of the outer W-shaped rubber ring faces the outer cylindrical surface of the sealing cavity, and the outer W-shaped rubber ring is tightly attached to the static sealing ring and the outer cylindrical surface of the sealing cavity to form a static sealing surface; the bottom of the static sealing ring is embedded into a groove of the inner W special-shaped rubber ring; the inner W special-shaped rubber ring is compressed and embedded between the static sealing ring and the root part of the shaft neck of the bit leg, and is tightly attached to the static sealing ring, the lower end surface of the sealing cavity and the inner cylindrical surface to form a static sealing surface; the opening of the inner W-shaped rubber structure faces to the inner cylindrical surface of the sealing cavity; an oil storage tank is arranged on the groove of the inner W special-shaped rubber ring.
Description
Technical Field
The invention relates to a double-W-shaped combined metal sealing structure for a roller bit.
Background
The metal seal is a common rotary dynamic seal element in the underground roller bit, has the advantages of high temperature resistance, wear resistance, wide applicable rotating speed and the like compared with the traditional O-shaped ring rubber seal, and is widely used in related industries such as oil gas and ore exploitation. Taking a single metal seal as an example, the sealing structure is composed of a dynamic sealing ring, a static sealing ring, an O-shaped rubber ring and a rubber supporting ring. When the roller bit works, the roller bit is simultaneously pressed by lubricating grease on the inner side and mud slurry on the outer side of the sealing system, and the O-shaped rubber ring and the rubber support ring are compressed and deformed to be tightly attached to the static ring to form static seal; meanwhile, relative rotation exists between the movable ring and the static ring, and an oil film is formed at the sealing end face to form the dynamic seal. However, under the multiphase flow environment of high temperature and high pressure in the well, the metal sealing end face is easy to generate thermal deformation, and the high-frequency vibration of the roller bit makes the metal sealing in a long-term unstable working state, and meanwhile, abrasive particles in surrounding mud slurry continuously invade, so that the abrasive particle abrasion of the metal sealing end face is aggravated, the sealing failure is caused quickly, and the working efficiency and the service life of the bit are further influenced.
Therefore, in order to overcome the problems that the conventional metal sealing structure has short service life, is easy to generate sealing failure and has weak anti-vibration capability under the working conditions of high temperature, high pressure and grinding performance, a novel metal sealing structure needs to be further designed, external particles are effectively prevented from entering a sealing end face, the stable and reliable operation of metal sealing is maintained, and the service life of a sealing system is prolonged.
Disclosure of Invention
The invention provides a double-W-shaped combined metal sealing structure for a roller bit, which is simple in structure, strong in wear resistance and good in vibration resistance effect, and aims to overcome the problems in the prior art.
The invention relates to a double-W-shaped combined metal sealing structure for a roller bit, which is characterized in that:
the dynamic sealing ring is positioned at the top of a sealing cavity, is in interference fit with a cone inner hole and rotates along with a cone, the sealing cavity is formed by the cone inner hole and the root part of a cone leg shaft neck and comprises an upper end surface, a lower end surface, an outer cylindrical surface and an inner cylindrical surface, the dynamic sealing ring and the static sealing ring rotate relatively, the end surfaces are matched with each other to form a dynamic sealing surface, an outer rectangular groove is arranged on the outer cylindrical surface of the upper part of the static sealing ring, the outer W-shaped rubber ring is embedded into the outer rectangular groove, the opening of the outer W-shaped rubber ring faces to the outer cylindrical surface of the sealing cavity, the outer W-shaped rubber ring is tightly attached to the static sealing ring and the outer cylindrical surface of the sealing cavity to form a static sealing surface, the bottom of the static sealing ring is embedded into the groove of the inner W-shaped rubber ring, the inner W-shaped rubber ring comprises an inner W-shaped rubber structure on the upper part and an L-shaped rubber structure on the lower part, the static sealing ring is compressed and embedded between the static sealing ring and the root part of the cone leg shaft neck, and is tightly attached to the lower end surface and the inner cylindrical surface of the static sealing ring to form.
Preferably, the oil storage tank is provided with a plurality of grooves at intervals.
The invention relates to another technical scheme of a double-W-shaped combined metal sealing structure for a roller bit, which is characterized in that:
comprises a dynamic sealing ring, a static sealing ring, an outer W-shaped rubber ring, an inner W-shaped rubber ring and a rubber supporting ring. The dynamic sealing ring is positioned at the top of the sealing cavity, is in interference fit with an inner hole of the cone and rotates along with the cone. The sealing cavity is formed by enclosing a cone inner hole and the root part of a cone leg shaft neck and comprises an upper end surface, a lower end surface, an outer cylindrical surface and an inner cylindrical surface. The dynamic sealing ring and the static sealing ring rotate relatively, and the end surfaces of the dynamic sealing ring and the static sealing ring are mutually matched to form a dynamic sealing surface. An outer rectangular groove and an inner rectangular groove are respectively arranged on the outer cylindrical surface and the inner cylindrical surface of the upper part of the static sealing ring, and a lower rectangular groove is arranged on the end surface of the bottom part of the static sealing ring. An outer W-shaped rubber ring is embedded into the outer rectangular groove, the opening of the outer W-shaped rubber ring faces the outer cylindrical surface of the sealing cavity, and the outer W-shaped rubber ring is tightly attached to the static sealing ring and the outer cylindrical surface of the sealing cavity to form a static sealing surface. An inner W-shaped rubber ring is embedded in the inner rectangular groove, the opening of the inner W-shaped rubber ring faces the inner cylindrical surface of the sealing cavity, and the inner W-shaped rubber ring is tightly attached to the static sealing ring and the inner cylindrical surface of the sealing cavity to form a static sealing surface. The upper part of the rubber support ring is provided with an inner groove and an outer groove, and the bottom of the rubber support ring is embedded into the groove at the root of the bit leg shaft neck to form a static sealing surface. The bottom of the static sealing ring is embedded into the inner groove and the outer groove of the rubber supporting ring to be tightly attached to form a static sealing surface. And oil storage grooves are formed in the inner groove and the outer groove of the rubber support ring.
Preferably, the oil storage tanks are arranged on the inner groove and the outer groove at intervals of 1-3.
The invention has the beneficial effects that:
the double-W-shaped combined metal sealing structure for the roller bit adopts the form that the groove is formed in the side wall of the static sealing ring and the double-W-shaped rubber ring group is used as an auxiliary material, realizes multiple sealing in a narrow sealing space, and has the advantages of simple structure, convenience in installation, stability and reliability.
The double W-shaped rubber ring groups can be arranged on two sides of the static sealing ring in an up-down staggered manner or a symmetrical manner, and can also be integrated with the bottom rubber supporting ring into an integrated inner W-shaped rubber ring. Within the expected service life of the sealing system, only the W-shaped rubber ring can be replaced, and good overall sealing performance can be ensured.
The outer W-shaped rubber ring in the double W-shaped rubber ring group can serve as a first barrier before mud enters the dynamic sealing surface, and the multistage seal and the plurality of closed cavities formed by the outer W-shaped rubber ring can be used for blocking and retaining abrasive particles in advance, so that the possibility of the particles entering the dynamic sealing surface is greatly reduced; the inner W-shaped rubber ring (or the inner W-shaped rubber ring) can effectively resist outward leakage of lubricating grease on one hand, and on the other hand, under the combined action of the inner W-shaped rubber ring and the outer W-shaped rubber ring, the frequently-changed three-way acting force borne by the static sealing ring is counteracted through self compression expansion deformation and the dynamic balance action of the double-ring group on the side wall, so that the axial and radial vibration of a sealing system caused by the work of the roller bit is weakened. Even under a high-pressure state, the static sealing ring can be relatively stable and has small offset, and the reliability and the overall performance of the sealing system are enhanced.
The bottom of the static sealing ring is embedded into the inner W special-shaped rubber ring or the rubber supporting ring, so that the position of the static sealing ring can be kept relatively fixed, the vibration resistance is further enhanced, mud liquid can be effectively resisted to enter the sealing system from the bottom, and the reliability of the static sealing of the bottom is ensured. In addition, an oil storage groove is formed in the contact surface between the bottom of the static sealing ring and the rubber supporting ring, so that a small amount of invaded particles can be retained and buffered while friction is reduced, and the generation of abrasive particle abrasion is greatly reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of a roller cone bit shaft for use with the present invention.
Fig. 2 is a partially enlarged view of embodiment 1 of the present invention.
Fig. 3 is a partially enlarged view of embodiment 2 of the present invention.
Fig. 4 is a partially enlarged view of the outer W-shaped rubber ring of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
With reference to the accompanying drawings:
embodiment 1 the double-W-shaped combined metal sealing structure for the roller bit comprises a dynamic sealing ring 1, a static sealing ring 2, an outer W-shaped rubber ring 3 and an inner W-shaped rubber ring 4, wherein the dynamic sealing ring 1 is located at the top of a sealing cavity 5, is in interference fit with an inner hole of a roller cone 6 and rotates along with the roller cone 6, the sealing cavity 5 is formed by the inner hole of the roller cone 6 and the root of a cone leg journal 7, and comprises an upper end surface 51, a lower end surface 52, an outer cylindrical surface 53 and an inner cylindrical surface 54, the dynamic sealing ring 1 and the static sealing ring 2 rotate relatively, the end surfaces are mutually matched to form a dynamic sealing surface, an outer rectangular groove 21 is formed in the outer cylindrical surface at the upper part of the static sealing ring 2, the outer W-shaped rubber ring 3 is embedded in the outer rectangular groove 21, the outer W-shaped rubber ring 3 is opened towards the outer cylindrical surface 53 of the sealing cavity 5, the outer W-shaped rubber ring 3 is tightly attached to the static sealing ring 2 and the outer cylindrical surface 53 of the sealing cavity 5 to form a static sealing surface, the bottom of the static sealing ring 2 is embedded in a groove 41 of the inner W-shaped rubber ring 4, the inner W-shaped rubber ring 4 is embedded in the oil storage groove 41, the special-shaped rubber ring 4 is arranged between the inner W-shaped sealing structure, the special-shaped sealing cavity, the special-shaped rubber ring 2, the special-shaped sealing ring 4 is embedded in the special-shaped sealing.
The working principle of the invention is as follows:
when the roller bit works, the dynamic sealing ring 1 is positioned at the top of the sealing cavity 5, is in interference fit with an inner hole of the roller 6, rotates relative to the static sealing ring 2, and the end surfaces are mutually matched to form a dynamic sealing surface. And 1-2 rectangular grooves are formed in the side wall of the static sealing ring 2. The outer W-shaped rubber ring 3 is tightly attached to the static sealing ring 2 and the outer cylindrical surface 53 of the sealing cavity 5, and a static sealing surface is formed on the outer side of the static sealing ring 2; the inner W special-shaped rubber ring 4 (or the inner W-shaped rubber ring 8 and the rubber support ring 9) is tightly attached to the static seal ring 2, the lower end face 52 and the inner cylindrical surface 54 of the seal cavity 5, and static seal faces are formed on the inner side and the lower portion of the static seal ring 2.
High-pressure lubricating grease enters the sealing cavity 5 from the flow channel I, mainly flows into the dynamic sealing surface along a gap between the inner wall surface of the dynamic sealing ring 1 and the bit leg shaft neck 7, in addition, a small amount of lubricating grease entering the gap between the inner cylindrical surface of the static sealing ring 1 and the bit leg shaft neck 7 is sealed by the inner W-shaped rubber ring 4 (or the inner W-shaped rubber ring 8), and the lubricating grease leaking from the dynamic sealing surface and entering the gap between the outer cylindrical surface of the static sealing ring 1 and the cone 6 is sealed by the outer W-shaped rubber ring 3.
The mud liquid enters the sealing cavity 5 from the flow channel II, part of the mud liquid flows towards the direction of the dynamic sealing surface along the outer cylindrical surface 53 of the sealing cavity 5 and is sealed by the outer W-shaped rubber ring 3, the other part of the mud liquid flows towards the other side of the static sealing ring along the lower end surface 54 of the sealing cavity 5 and is sealed by the inner W-shaped rubber ring 4 (or the rubber support ring 9).
Taking the flowing process of the mud liquid in the outer W-shaped rubber ring 3 as an example, the working principle of the W-shaped rubber ring is specifically explained: the outer W-shaped rubber ring 3 is tightly attached to the static sealing ring 2 and the outer cylindrical surface 53 of the sealing cavity 5 to form five closed spaces, and mud liquid is further shunted when flowing through the outer W-shaped rubber ring 3 and flows towards a gap (namely a flow channel III) between the outer W-shaped rubber ring 3 and the outer cylindrical surface 53 of the sealing cavity 5 and a gap (namely a flow channel IV) between the outer W-shaped rubber ring 3 and the outer rectangular groove 21 respectively. In the flow channels III and IV, the slurry liquid is sequentially subjected to 3-stage sealing and 4-stage sealing, under the action of multi-stage sealing, most of abrasive particles in the slurry liquid are retained in the five closed spaces, and abrasion and disturbance caused by the invasion of the slurry liquid to the metal sealing end face are reduced to a great extent.
In addition, an oil storage groove is arranged on the contact surface of the bottom of the static sealing ring 2 and the inner W special-shaped rubber ring 4 (or the rubber support ring 9), so that leaked lubricating grease can be stored in a small amount, the end surface friction is reduced, and a good buffering effect on the invasion of outside slurry can be achieved.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but includes equivalent technical means as would be recognized by those skilled in the art based on the inventive concept.
Claims (4)
1. Roller bit is with two W type combination formula metal seal structure, its characterized in that:
the oil-storage cone roller bearing comprises a movable sealing ring, a static sealing ring, an outer W-shaped rubber ring and an inner W-shaped rubber ring, wherein the movable sealing ring is located at the top of a sealing cavity, is in interference fit with a cone inner hole and rotates along with a cone, the sealing cavity is formed by enclosing a cone inner hole and the root of a cone leg shaft neck and comprises an upper end surface, a lower end surface, an outer cylindrical surface and an inner cylindrical surface, the movable sealing ring and the static sealing ring rotate relatively, the end surfaces are matched with each other to form a movable sealing surface, an outer rectangular groove is formed in the outer cylindrical surface of the upper portion of the static sealing ring, the outer W-shaped rubber ring is embedded into the outer W-shaped rubber ring, the opening of the outer W-shaped rubber ring faces the outer cylindrical surface of the sealing cavity, the outer W-shaped rubber ring is tightly attached to the static sealing ring and the outer cylindrical surface of the sealing cavity to form a static sealing surface, the bottom of the static sealing ring is embedded into the groove of the inner W-shaped rubber ring, the inner W-shaped rubber ring comprises an inner W-shaped rubber structure on the upper portion and an L-shaped rubber structure, the outer W-shaped rubber ring is compressed and embedded between.
2. The dual W-shaped composite metal seal structure for a roller cone drill bit of claim 1, wherein: the oil storage tank is provided with a plurality of grooves at intervals.
3. Roller bit is with two W type combination formula metal seal structure, its characterized in that:
the sealing device comprises a movable sealing ring, a static sealing ring, an outer W-shaped rubber ring, an inner W-shaped rubber ring and a rubber supporting ring; the dynamic sealing ring is positioned at the top of the sealing cavity, is in interference fit with an inner hole of the cone and rotates along with the cone; the sealing cavity is formed by enclosing a cone inner hole and the root part of a cone leg shaft neck and comprises an upper end surface, a lower end surface, an outer cylindrical surface and an inner cylindrical surface; the dynamic sealing ring and the static sealing ring rotate relatively, and the end surfaces of the dynamic sealing ring and the static sealing ring are matched with each other to form a dynamic sealing surface; an outer rectangular groove and an inner rectangular groove are respectively arranged on the outer cylindrical surface and the inner cylindrical surface of the upper part of the static sealing ring, and a lower rectangular groove is arranged on the end surface of the bottom; an outer W-shaped rubber ring is embedded in the outer rectangular groove, the opening of the outer W-shaped rubber ring faces to the outer cylindrical surface of the sealing cavity, and the outer W-shaped rubber ring is tightly attached to the static sealing ring and the outer cylindrical surface of the sealing cavity to form a static sealing surface; an inner W-shaped rubber ring is embedded into the inner rectangular groove, the opening of the inner W-shaped rubber ring faces to the inner cylindrical surface of the sealing cavity, and the inner W-shaped rubber ring is tightly attached to the static sealing ring and the inner cylindrical surface of the sealing cavity to form a static sealing surface; the upper part of the rubber support ring is provided with an inner groove and an outer groove, and the bottom of the rubber support ring is embedded into the groove at the root part of the bit leg shaft neck to form a static sealing surface; the bottom of the static sealing ring is embedded into the inner groove and the outer groove of the rubber supporting ring and tightly attached to form a static sealing surface; and oil storage grooves are formed in the inner groove and the outer groove of the rubber support ring.
4. The dual W-shaped composite metal seal structure for a roller cone drill bit of claim 3, wherein: the oil storage tank is provided with 1-3 oil storage tanks on the inner groove and the outer groove at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010241346.6A CN111456635A (en) | 2020-03-31 | 2020-03-31 | double-W-shaped combined metal sealing structure for roller bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010241346.6A CN111456635A (en) | 2020-03-31 | 2020-03-31 | double-W-shaped combined metal sealing structure for roller bit |
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| Publication Number | Publication Date |
|---|---|
| CN111456635A true CN111456635A (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010241346.6A Pending CN111456635A (en) | 2020-03-31 | 2020-03-31 | double-W-shaped combined metal sealing structure for roller bit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201826754U (en) * | 2010-06-18 | 2011-05-11 | 北京石油化工学院 | Roller bit metal floating sealing device |
| CN102287139A (en) * | 2010-06-18 | 2011-12-21 | 北京石油化工学院 | Cone bit metal floating-sealing device |
| CN108533179A (en) * | 2018-04-03 | 2018-09-14 | 西南石油大学 | Rock bit dumbbell type sealing structure |
| CN110359850A (en) * | 2018-04-03 | 2019-10-22 | 西南石油大学 | Rock bit novel sealing structure |
| CN212454254U (en) * | 2020-03-31 | 2021-02-02 | 浙江工业大学 | double-W-shaped combined metal sealing structure for roller bit |
-
2020
- 2020-03-31 CN CN202010241346.6A patent/CN111456635A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201826754U (en) * | 2010-06-18 | 2011-05-11 | 北京石油化工学院 | Roller bit metal floating sealing device |
| CN102287139A (en) * | 2010-06-18 | 2011-12-21 | 北京石油化工学院 | Cone bit metal floating-sealing device |
| CN108533179A (en) * | 2018-04-03 | 2018-09-14 | 西南石油大学 | Rock bit dumbbell type sealing structure |
| CN110359850A (en) * | 2018-04-03 | 2019-10-22 | 西南石油大学 | Rock bit novel sealing structure |
| CN212454254U (en) * | 2020-03-31 | 2021-02-02 | 浙江工业大学 | double-W-shaped combined metal sealing structure for roller bit |
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