CN205173488U - Composite seal mechanism with pressure compensation - Google Patents
Composite seal mechanism with pressure compensation Download PDFInfo
- Publication number
- CN205173488U CN205173488U CN201520979293.2U CN201520979293U CN205173488U CN 205173488 U CN205173488 U CN 205173488U CN 201520979293 U CN201520979293 U CN 201520979293U CN 205173488 U CN205173488 U CN 205173488U
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- China
- Prior art keywords
- piston
- seal
- left end
- hand member
- interference fit
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Abstract
The utility model provides a composite seal mechanism with pressure compensation, is applicable to full rotation type rotatory steerable drilling instrument in the pit, the go -between is through pack into the left end of seal cover of interference fit, the right -hand member of go -between and the welding of the left end of metal seal bellows together, the welding of the right -hand member of metal seal bellows is at the left end of pressure cylinder liner, pressure cylinder liner high order end is provided with the relief valve, and the right of relief valve is provided with the check valve, the pressure cylinder liner inside with piston interference fit, the piston simultaneously and guiding axle interference fit, the right -hand member face department of piston and the left end welding of spring, the right -hand member welding of spring is in the left end face department of helixseal, the interference fit cover is passed through on the guiding axle to the helixseal, and the helixseal right -hand member passes through the check ring location, the go -between is the sealed drilling fluid and inside lubricating oil that is got into by guiding axle activity space department mainly, and helixseal and piston be the drilling fluid and the inside lubricating oil of sealed clearance entering by spiral seal structure department jointly to the solid particle that fall in drilling fluid is considered by the helixseal, the utility model has the characteristics of high temperature and high pressure, corrosion -resistant, shock -resistant, stand wear and tear, sealing performance height, long -life etc.
Description
Technical field
The utility model relates to a kind of sealing being applicable to full rotation guiding type rotary steering drilling tool, and particularly one is with pressure compensated combination seal mechanism.
Background technique
The sealing of guide drilling tool mainly solves rotary sleeve or the sealing problem between non-rotating overcoat and axle.The sealing being usually used in rotary steering drilling tool mainly contains packing seal and lip seal, these two kinds of seal form are mainly realized by compressed gasketing material generation large deformation, be difficult to meet the performance requirement of controllable bent joint rotary steering drilling tool to sealing configuration under different drill mode and bad working environments condition, be mainly reflected in following some:
1. there is the pivot angle of scope of design in sealing surface, and therefore sealing configuration needs to realize sealing when leaving suitable swing space for the axis of guide, and during adjustment pivot angle size, sealing configuration needs automatic compensation function, ensures not produce leakage.
2. sealing configuration and material can bear down-hole high temperature, high pressure, can resist the shock and vibration that drill bit produces when broken rock.
3. sealing material is corrosion-resistant, wear-resistant, not easily aging.
4. sealing configuration has higher reliability and life-span.
Due to, packing seal is difficult to realize radial compensation when sealing surface swings, and can wear and tear comparatively fast near gland place; Lip seal is difficult to meet seal request when sealing surface pressure at both sides difference exists irregular change, and under high the tempering property drilling fluid environment of down-hole High Temperature High Pressure, is difficult to play sealing effect.So packing seal and lip seal are difficult to meet the above-mentioned requirements of controllable bent joint rotary steering drilling tool to sealing configuration.
Summary of the invention
In order to overcome the defect of above-mentioned prior art, the purpose of this utility model is to provide a kind of with pressure compensated combination seal mechanism, and this structure has high temperature high voltage resistant, corrosion-resistant, shock-resistant, wear-resistant, the features such as sealability is high, long lifetime.
In order to achieve the above object, the technical solution of the utility model is:
A kind of with pressure compensated combination seal mechanism, be applicable to pivoted down-hole rotary steering drilling tool, comprise connecting ring 3, connecting ring 3 loads the left end of stuffing box gland 5 by interference fit, the right-hand member of connecting ring 3 and the left end of metal sealing bellows 4 weld together, and the right-hand member of metal sealing bellows 4 is welded on the left end of pressure cylinder sleeve 8; Pressure cylinder sleeve 8 high order end is provided with safety valve 6, the right of safety valve 6 is provided with one-way valve 7, pressure cylinder sleeve 8 inside and piston 9 interference fit, with the axis of guide 14 interference fit while of piston 9, the right side place of piston 9 welds with the left end of spring 10, the right-hand member of spring 10 is welded on the left side place of spiral seal 12, and spiral seal 12 is enclosed within the axis of guide 14 by interference fit, and spiral seal 12 right-hand member is located by check ring.
The sectional shape of high pressure resistant combination seal groove A, seal groove A that connecting ring 3 is identical with piston 9 being equipped with three is trapezoidal, and O RunddichtringO 17 is contained in the middle of seal groove A, and the equal symmetry in O RunddichtringO 17 both sides is equipped with wedge-type seal circle 15 and backup seal ring 16.
Pressure cylinder sleeve 8 left end outer surface is processed into wedge shape between safety valve 6.
The contact distance of piston 9 inner headed face and the axis of guide 14 is greater than the contact distance of piston 9 and pressure cylinder sleeve 8.
The utility model has the following advantages:
(1) the utility model is that the axis of guide leaves adequate space around the swing of guiding joint freedom and flexibility, and make the axis of guide comparatively be easy to reach the inclination maximum of designing requirement, sealing mechanism does not produce space constraint to it.
(2) the utility model adopts combined seal ring design, organic cooperation of wedge shape section metal o-ring, rectangular seal, O type circle, enhance the tolerance of seal ring to down-hole high pressure, reduce the seal ring produced because of pressure difference and lost efficacy, improve the operating life of sealing configuration.
(3) the utility model have employed the design method that pressure compensation mechanism coordinates other seal elements, and pressure compensation mechanism is made up of pressure cylinder sleeve 8, piston 9, spring 10, safety valve 6, one-way valve 7.Pressure cylinder sleeve left end and metal sealing bellows-welding, pressure cylinder sleeve two ends outer surface is processed into wedge shape, and there are safety valve and one-way valve in pressure cylinder sleeve left end place.Piston sleeve is on the axis of guide, and in piston, circle cross-section is slightly longer than outer circle cross-section, and piston inner hole and outer surface have groove, and the layout of each seal ring is arranged identical with connecting ring groove seal ring.Piston right-hand member welding spring, spring right-hand member is connected to spiral seal left end.Effectively reduce the pressure difference of both sides, seal interface, reduce the destruction that other seal elements cause because of high pressure difference, decrease leakage rate.
Accompanying drawing explanation
Fig. 1 is combined sealing structure schematic diagram.
Fig. 2 is seal ring composite structure schematic diagram.
In figure: 1 rotary sleeve, 2 guiding joints, 3 connecting rings, 4 metal sealing bellowss, 5 stuffing box glands, 6 safety valves, 7 one-way valves, 8 pressure cylinder sleeves, 9 pistons, 10 springs, 11 spiral seals, 12 elasticity gauzes, 13 check rings, 14 axis of guides, 15 wedge-type seal circles, 16 backup seal rings, 17O type circle.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
With reference to Fig. 1, a kind of with pressure compensated combination seal mechanism, be applicable to pivoted down-hole rotary steering drilling tool (controllable bent joint), comprise connecting ring 3, connecting ring 3 loads the left end of stuffing box gland 5 by interference fit, the right-hand member of connecting ring 3 and the left end of metal sealing bellows 4 weld together, and the right-hand member of metal sealing bellows 4 is welded on the left end of pressure cylinder sleeve 8; Pressure cylinder sleeve 8 high order end is provided with safety valve 6, the right of safety valve 6 is provided with one-way valve 7, pressure cylinder sleeve 8 inside and piston 9 interference fit, with the axis of guide 14 interference fit while of piston 9, the right side place of piston 9 welds with the left end of spring 10, and the right-hand member of spring 10 is welded on the left side place of spiral seal 12.Spiral seal 12 is enclosed within the axis of guide 14 by interference fit, and spiral seal 12 right-hand member is located by check ring.
With reference to Fig. 2, the high pressure resistant combination seal groove A that connecting ring 3 is identical with piston 9 being equipped with three, the sectional shape of seal groove A is trapezoidal, and O RunddichtringO 17 is contained in the middle of seal groove A, and the equal symmetry in O RunddichtringO 17 both sides is equipped with wedge-type seal circle 15 and backup seal ring 16.When regulating sealing surface pressure at both sides, piston 9 can move around along the axis of guide 14, and piston 9 inside and outside circle place is all main pressure-bearing surface and leakage way, therefore needs high pressure sealing.
Pressure cylinder sleeve 8 left end outer surface is processed into wedge shape between safety valve 6, produces downthrust to prevent pressure cylinder sleeve 8 and stuffing box gland 5 when the bending deflection of metal sealing bellows.
The contact distance of piston 9 inner headed face and the axis of guide 14 is greater than the contact distance of piston 9 and pressure cylinder sleeve 8; In order to increase servo-actuated compensatory when the axis of guide 14 frequent swing of piston 9.
Working principle of the present utility model: controllable bent joint is when vertically creeping into, and the axis of guide 14 and rotary sleeve are in same axis, the high pressure resistance sealing structure at connecting ring 3 place and piston 9 and spiral seal play main seal effect.The drilling fluid that connecting ring 3 main seal is entered by the axis of guide 14 activity space and inner lubricant oil, spiral seal 12 and piston 9 seal the drilling fluid and internal lubrication oil that are entered by the gap of spiral seal 12 structure jointly, and are filtered the solid particle in drilling fluid by spiral seal 12.
Controllable bent joint is when guide digging, by the plastic deformation of metal sealing bellows 4, sealing configuration is made to produce pendulum angle with the axis of guide, and ensure the stability of connecting ring 3 and pressure balance mechanism, reduce the floating elastic requirement to seal ring, decreasing fretting wear destroys, improve overall performance, in addition, certain damping, buffering effect is also played in the axial deformation of spring 10 and metal sealing bellows 4, is also very favorable to maintenance the relatively stable of high pressure sealing face.Elasticity gauze 12 has good servo-actuated compensatory, can make up the gap that the axis of guide produces when beat in time, and effectively filters the solid particle in drilling fluid, prevents solids particles precipitate from hindering the swing of the axis of guide.
In whole guide digging process, pressure compensation mechanism makes respective change to downhole drill hydraulic coupling all constantly, remains within designing requirement, improve sealing configuration life-span and performance by the mobile sealing configuration pressure at both sides difference that regulates of piston 9.
Claims (4)
1. one kind with pressure compensated combination seal mechanism, be applicable to pivoted down-hole rotary steering drilling tool, it is characterized in that, comprise connecting ring (3), connecting ring (3) loads the left end of stuffing box gland (5) by interference fit, the right-hand member of connecting ring (3) and the left end of metal sealing bellows (4) weld together, and the right-hand member of metal sealing bellows (4) is welded on the left end of pressure cylinder sleeve (8), pressure cylinder sleeve (8) high order end is provided with safety valve (6), the right of safety valve (6) is provided with one-way valve (7), pressure cylinder sleeve (8) inside and piston (9) interference fit, with the axis of guide (14) interference fit the while of piston (9), the right side place of piston (9) welds with the left end of spring (10), the right-hand member of spring (10) is welded on the left side place of spiral seal (12), spiral seal (12) is enclosed within the axis of guide (14) by interference fit, and spiral seal (12) right-hand member is located by check ring.
2. one according to claim 1 is with pressure compensated combination seal mechanism, it is characterized in that, the high pressure resistant combination seal groove (A) that connecting ring (3) is identical with piston (9) being equipped with three, the sectional shape of seal groove (A) is trapezoidal, O RunddichtringO (17) is contained in the middle of seal groove (A), and the equal symmetry in O RunddichtringO (17) both sides is equipped with wedge-type seal circle (15) and backup seal ring (16).
3. one according to claim 1 is with pressure compensated combination seal mechanism, it is characterized in that, pressure cylinder sleeve (8) left end outer surface is processed into wedge shape between safety valve (6).
4. one according to claim 1 is with pressure compensated combination seal mechanism, it is characterized in that, the contact distance of piston (9) inner headed face and the axis of guide (14) is greater than the contact distance of piston (9) and pressure cylinder sleeve (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520979293.2U CN205173488U (en) | 2015-11-30 | 2015-11-30 | Composite seal mechanism with pressure compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520979293.2U CN205173488U (en) | 2015-11-30 | 2015-11-30 | Composite seal mechanism with pressure compensation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205173488U true CN205173488U (en) | 2016-04-20 |
Family
ID=55737482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520979293.2U Expired - Fee Related CN205173488U (en) | 2015-11-30 | 2015-11-30 | Composite seal mechanism with pressure compensation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205173488U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105333156A (en) * | 2015-11-30 | 2016-02-17 | 西安石油大学 | Combined sealing structure with pressure compensation |
-
2015
- 2015-11-30 CN CN201520979293.2U patent/CN205173488U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105333156A (en) * | 2015-11-30 | 2016-02-17 | 西安石油大学 | Combined sealing structure with pressure compensation |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160420 Termination date: 20181130 |