CN111322017A - Enhanced sealing structure of direct-connection sleeve joint - Google Patents
Enhanced sealing structure of direct-connection sleeve joint Download PDFInfo
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- CN111322017A CN111322017A CN202010242574.5A CN202010242574A CN111322017A CN 111322017 A CN111322017 A CN 111322017A CN 202010242574 A CN202010242574 A CN 202010242574A CN 111322017 A CN111322017 A CN 111322017A
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- 238000007789 sealing Methods 0.000 title claims abstract description 105
- 239000000463 material Substances 0.000 claims description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000035882 stress Effects 0.000 description 14
- 239000002184 metal Substances 0.000 description 9
- 238000013461 design Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005844 autocatalytic reaction Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910001510 metal chloride Inorganic materials 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 210000000323 shoulder joint Anatomy 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Gasket Seals (AREA)
Abstract
The invention relates to an enhanced sealing structure of a direct-connection type sleeve joint, wherein a sealing ring is filled in a gap formed by a joint male shoulder and a joint female shoulder of the direct-connection type sleeve joint in an interference manner, the gap formed by the joint male shoulder and the joint female shoulder is wide inside and narrow outside, the shoulder gap male end is an inclined shoulder, the female end is a straight shoulder, the gap forms a right-angle trapezoidal structure, the radial included angle α of the inclined shoulder is 20-60 degrees, the cross section shape of the sealing ring is matched with the shoulder gap, the outer diameter D of the cylindrical surface of the shoulder and the inner diameter D of the sealing ring meet the condition that D is less than or equal to D, D-D is 0.1-0.3 mm, the fillet R of the male shoulder and the fillet R of the sealing ring meet the condition that R is less than or equal to R, R is 0.3-1 mm, R is 1-1.5 mm, the shoulder height H and the width H of the sealing ring meet the condition that H is more than H, and H-H is 1-1.5 mm.
Description
Technical Field
The invention belongs to the technical field of processing and manufacturing of petroleum casing joints, and particularly relates to an enhanced sealing structure of a direct-connection casing joint.
Background
In the field of petroleum casing processing, a direct-connection type casing is a joint connection form without a coupling, the casing is processed into an internal thread and an external thread respectively, the overall external diameter after assembly is the same as that of a casing body, compared with the conventional casing with the coupling, the direct-connection type casing is small, the casing is required to smoothly pass through due to the fact that an original well is required to be utilized during well workover, and the external diameter of the casing coupling with the coupling cannot meet the requirement, so that the direct-connection type casing must be used; on the other hand, in the well cementation process, the clearance between the well and the outer wall of the pipe column is limited, the cement is difficult to return upwards, and the direct-connection casing without the coupling greatly increases the annular space, so that the well descending and well cementation are facilitated.
Because the male and female ends of the direct-connection type sleeve joint have the characteristic of equal outer diameter, the sleeve joint at least has an inner shoulder structure and an outer shoulder structure. The joint comprises a male end and a female end, and the male end structure comprises a male inner shoulder, a male inner sealing surface, a male thread and a male outer shoulder; the female end structure comprises a female inner shoulder, a female inner sealing surface, female threads and a female outer shoulder.
When the connector is assembled, the male thread is screwed into the female thread, the male inner sealing surface is contacted with the female inner sealing surface and generates radial interference along with continuous screwing, the interference is increased along with the screwing until the male inner shoulder and the female inner shoulder are butted to finish the assembly, and the interference contact of the metal sealing surface enables the whole connector to have sealing capacity and effectively isolates pressure media inside and outside the sleeve.
According to the theory of mechanical design, when two parts have step-type contact surfaces in the horizontal direction, the effective contact surfaces cannot be larger than one pair, and due to machining precision and errors, two or more pairs of contact surfaces cannot be ensured to be contacted simultaneously. In order to ensure the absolute advantages of the metal seal of the joint and achieve the design performance of the joint, the direct connection type sleeve joint with a multi-shoulder structure needs to avoid over-positioning. Two pairs of shoulders and above shoulders in the axial direction are over-positioning structures, complete opposite vertex can be realized only by one pair of shoulders after assembly, and positioning interference can be avoided only by carrying out clearance design on non-key shoulders in order to ensure that key parameters meet design requirements. For the direct-connection type sleeve joint with the inner shoulder and the outer shoulder, the male end thread is longer than the female end thread, the male inner shoulder and the female inner shoulder are butted after assembly, and a gap exists between the male outer shoulder and the female outer shoulder.
The small gaps present in the assembly of parts can produce crevice corrosion in corrosive media. In the corrosion principle, the difference between the concentration of metal ions or dissolved oxygen in the gap and the concentration around the gap causes chemical reaction, and due to the autocatalysis process of the corrosion, metal chloride among the gaps is hydrolyzed, so that the PH is reduced quickly to accelerate the corrosion of the metal; the direct-connection type sleeve joint realizes the isolation of pressure media inside and outside the sleeve through the interference contact of metal sealing surfaces and the complete opposite vertex of shoulders, but external corrosive pressure media invade the interior of threads through small gaps existing in non-opposite-vertex shoulders, so that the failure of the joint is accelerated.
The direct-connection type casing joint comprises appearance forms such as a pure direct-connection type, a semi-direct-connection type and a heading direct-connection type, the internal structure of the casing joint even has a double-section thread structure, but no matter how the internal structure changes, only one pair of shoulders can be used for realizing complete opposite-top contact, namely, non-opposite-top shoulders exist all the time. Shoulder gaps adversely affect the overall safety of casing joints in corrosive media, and no protection against the corrosive pressure medium intrusion of straight-on type casings other than the opposing shoulders is mentioned in the presently disclosed patents.
The direct-connected joint is not connected by adopting a coupling, so that the outer diameter of the whole tubular column is reduced. Although the outer diameter of the direct-connection type sleeve joint has two modes of complete flush (pure direct-connection type) and approximate flush (semi-direct-connection type and pier thick direct-connection type), the multi-shoulder structure is a design scheme which must be adopted by the direct-connection type joint, shoulder gaps caused by over-positioning problems have negative influence on the safe use of the joint, and the direct-connection type joint in the prior art has no good method for eliminating the shoulder gaps.
Therefore, based on the problems, the enhanced sealing structure of the casing joint, which is applied to the elimination of the gap of the direct-connection type casing joint non-opposite shoulder and has the effect of improving the overall safety performance of the joint, has important practical significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the enhanced sealing structure of the casing joint, which is applied to eliminate the gap of a non-abutting circular bead of a direct-connection casing joint and has the function of improving the overall safety performance of the joint.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
an enhanced sealing structure of a direct-connection type sleeve joint is characterized in that a sealing ring is filled in a gap formed by a joint male and female circular bead of the direct-connection type sleeve joint in an interference manner;
in addition, in order to ensure the stability of the sealing ring in the joint assembly, a gap formed by the male shoulder and the female shoulder of the joint is wide inside and narrow outside, the male end of the gap of the shoulders is an inclined shoulder, the female end of the gap of the shoulder is a straight shoulder, the gap forms a right-angled trapezoidal structure, and the radial included angle α of the inclined shoulder is 20-60 degrees;
wherein, the cross-sectional shape of the seal ring is matched with the shoulder clearance; the outer diameter D of the cylindrical surface of the shoulder and the inner diameter D of the sealing ring meet the condition that D is less than or equal to D, and D-D is 0.1-0.3 mm; the male end shoulder fillet R and the sealing ring fillet R meet the condition that R is less than or equal to R, and R is 0.3-1 mm, and R is 1-1.5 mm; the height H of the shoulder and the width H of the sealing ring meet the condition that H is larger than H, and H-H is 1-1.5 mm.
Furthermore, the direct-connection type sleeve joint is provided with at least one pair of non-opposite-top shoulders, a shoulder gap exists after assembly, and the gap range is 2-4 mm.
Further, the clearance formed by the male and female shoulders of the connector can be an outer shoulder clearance or an inner shoulder clearance.
The invention utilizes the PTFE hard material sealing ring to fill the gap of the shoulder of the direct-connection type joint. Because the seal ring is fundamentally different from a metal material, in the assembling process, the male shoulder and the female shoulder extrude the seal ring to generate certain contact stress, the seal ring with lower relative rigidity cannot generate negative influence on the interference of a metal seal surface of the joint and the design requirement of the top shoulder, and after the assembly, the seal ring with internal stress completely blocks a shoulder gap, so that the intrusion of an external corrosion medium is prevented, and the joint is better protected.
The PTFE (polytetrafluoroethylene) material adopted by the technical scheme has the advantages of high temperature resistance, corrosion resistance, ageing resistance and the like, and the sealing ring made of the PTFE material has good physical and chemical stability and good thermal stability and can normally work within the temperature range of-200 ℃ to 300 ℃.
The sealing ring in service is in a compressive stress state to fill the gap, before assembly, the static thickness of the sealing ring is larger than the designed gap of the shoulder, and the contact stress can be maintained only by enough compressive deformation; in addition, the sealing ring itself has a certain thickness to facilitate installation and fixation, which requires calculation to determine the minimum thickness of the sealing ring.
The relationship between the deformation amount of the seal ring and the contact stress satisfies the following formula:
stress/strain
＝(F/S)/((t-t1)/t)
＝σ/(△t/t)
＝σ*t/△t
Wherein, t-the initial thickness of the sealing ring is mm;
t 1-shoulder gap width, mm;
△ t-axial deformation of the seal ring, mm, △ t ═ t-t 1;
e-compression elastic modulus of the sealing ring, Mpa; (PTFE seal ring compression-resistant elastic modulus 280MPa)
Contact area between S-seal ring and shoulder, mm2；
F-contact force between the seal ring and the shoulder, N;
contact stress between the sigma-seal ring and the shoulder, Mpa;
then:
σ＝(E*△t/t)≥(k*P)
p-medium pressure, Mpa;
k-safety factor, which is determined according to working conditions (1.5-2);
the contact stress sigma between the sealing ring and the shoulder embodies the plugging capability of the sealing ring, and the compression deformation △ t of the sealing ring directly influences the contact stress sigma, so that the minimum thickness t of the sealing ring can be calculated according to the working condition of the joint.
The sealing ring is arranged before the connector is screwed in, the inner female shoulder is slowly close to the inner female shoulder along with the screwing of the thread, the thickness t of the sealing ring is larger than the designed clearance t1 of the shoulder, the sealing ring is extruded and deformed by the male and female shoulders until the positioning shoulders of the connector are completely in opposite contact and stop, the compression-resistant elastic modulus of the steel material is 206GPa, the compression-resistant elastic modulus of the sealing ring is 280MPa, the strength difference of the two materials is great,
(280/206000)*100％≈0.00136％
therefore, the influence of the resistance of the seal ring to deformation under pressure on the metal material is negligible.
In order to facilitate the manufacture of the sealing ring, the thickness t is preferably 4-10 mm, so that the sealing ring has enough rigidity and sufficient deformation to provide enough contact stress, and the shoulder gap value is the final extrusion thickness t1 of the sealing ring. The male end is connected with the length L1, the female end is connected with the length L2, and then the gap t1 is equal to L1-L2.
The invention has the advantages and positive effects that:
compared with the prior art, the PTFE sealing ring is used for plugging the non-positioning shoulder clearance of the direct-connection sleeve joint, the structural parameters of the sealing ring are determined through reasonable design, the sealing capability and the over-twisting resistance of the joint are not reduced, the shoulder clearance is thoroughly eliminated, and corrosive media are effectively prevented from invading the interior of the thread; the enhanced sealing structure of the casing joint is applied to eliminating the gap of the non-abutting circular bead of the direct-connection casing joint, and has an enhancing effect on the overall safety performance of the joint.
Drawings
The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a schematic structural view of an enhanced sealing structure of a direct connection type sleeve joint provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a seal ring of an enhanced sealing structure of a direct connection type sleeve joint provided by an embodiment of the invention;
FIG. 3 is a schematic diagram of a shoulder clearance of an enhanced seal configuration for a straight type sleeve joint provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view of the thread length configuration of the enhanced seal configuration of a straight connection type sleeve joint provided by an embodiment of the present invention;
Detailed Description
First, it should be noted that the specific structures, features, advantages, etc. of the present invention will be specifically described below by way of example, but all the descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implicit in any embodiment or any single feature shown or implicit in any drawing may still be combined or subtracted between any of the features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity, the same or similar features may be indicated in only one place in the same drawing.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The present invention will be specifically described with reference to fig. 1 to 4.
Example 1
FIG. 1 is a schematic structural view of an enhanced sealing structure of a direct connection type sleeve joint provided by an embodiment of the invention; FIG. 2 is a schematic structural diagram of a seal ring of an enhanced sealing structure of a direct connection type sleeve joint provided by an embodiment of the invention; FIG. 3 is a schematic diagram of a shoulder clearance of an enhanced seal configuration for a straight type sleeve joint provided in accordance with an embodiment of the present invention; FIG. 4 is a schematic view of the thread length configuration of the enhanced seal configuration of a straight connection type sleeve joint provided by an embodiment of the present invention; as shown in fig. 1 to 4, the enhanced sealing structure of the direct connection type sleeve joint provided by the present embodiment includes a male end 1 and a female end 2, where the male end 1 has a male inner shoulder 1-1, a male inner sealing surface 1-2, a male thread 1-3, and a male outer shoulder 1-4; the female end 2 is provided with a female inner shoulder 2-1, a female inner sealing surface 2-2, female threads 2-3 and a female outer shoulder 2-4; and a seal ring 3 arranged in the male external shoulder 1-4 and the female external shoulder 2-4; after the connector is assembled, the male inner shoulder 1-1 and the female inner shoulder 2-1 are in metal abutting contact, and the sealing ring 3 is used for interference filling of a gap between the male outer shoulder 1-4 and the female outer shoulder 2-4;
the gap formed by the male shoulder and the female shoulder of the connector is wide inside and narrow outside, the male end of the gap of the shoulders is an inclined shoulder, the female end of the gap of the shoulders is a straight shoulder, the gap forms a right-angled trapezoid structure, and the radial included angle α of the inclined shoulder is 20-60 degrees;
the cross section shape of the sealing ring is matched with the shoulder gap, so that the sealing ring is not extruded out when being pressed and deformed; the outer diameter D of the cylindrical surface of the shoulder and the inner diameter D of the sealing ring meet the condition that D is less than or equal to D, and D-D is 0.1-0.3 mm; the male end shoulder fillet R and the sealing ring fillet R meet the condition that R is less than or equal to R, and R is 0.3-1 mm, and R is 1-1.5 mm; the height H of the shoulder and the width H of the sealing ring meet the condition that H is larger than H, and H-H is 1-1.5 mm.
The sealing washer material is PTFE hard material, and the thickness of sealing washer satisfies:
σ＝(E*△t/t)≥(k*P)
the method comprises the steps of measuring the initial thickness of a t-sealing ring, measuring the axial deformation of the △ t-sealing ring, measuring the compression elastic modulus of an E-sealing ring, measuring the contact stress between the sigma-sealing ring and a shoulder, measuring the pressure of a P medium, measuring the pressure of the sigma-sealing ring, and measuring the k-safety coefficient.
The direct-connection type sleeve joint is provided with at least one pair of non-opposite shoulders, a shoulder gap exists after assembly, and the gap range is 2-4 mm.
The clearance formed by the male shoulder and the female shoulder of the connector can be an outer shoulder clearance or an inner shoulder clearance.
For example, in the embodiment, before screwing assembly, the sealing ring is sleeved on the outer shoulder cylindrical surface of the male end 1, as the screw threads are screwed in, the male shoulder and the female shoulder approach slowly, and the sealing ring is extruded and deformed by the male shoulder and the female shoulder until the connector positioning shoulders are completely abutted and contacted to stop; the sealing ring is extruded and deformed to a designed gap t1, and the sealing ring forms contact pressure stress and a stress value sigma in a shoulder gap, so that the invasion of external pressure media can be effectively blocked; the casing joint in this embodiment is a 7in (177.8) specification certain direct connection type special buckle casing joint, and the joint is a single-section thread structure, as shown in fig. 4: the length L1 of the male thread is 123mm, the length L2 of the female thread is 120mm, shoulder structures are designed at two ends of the threads, wherein a tapered metal sealing surface is designed at the position of an inner shoulder, the lengths of the male thread and the female thread have difference, the male thread and the female thread are long, after assembly, the joint realizes complete opposite vertex positioning and metal sealing interference of the inner shoulder, and the outer shoulder has a designed clearance t1 of L1-L2 of 123-120 mm; the medium pressure outside the joint is 60Mpa, and the safety coefficient K is required to be 2; the compression-resistant elastic modulus of the sealing ring is 280 MPa; and (3) using the PTFE hard sealing ring to perform clearance plugging, and calculating the minimum thickness of the sealing ring:
σ＝(E*△t/t)＝(E*(t-t1)/t)≥(k*P)；
then: (280 x (t-3)/t) not less than (2 x 60)
The minimum thickness t of the seal ring was determined to be 5.25 mm.
According to the structural parameters of the shoulder clearance, the outer diameter D of the cylindrical surface, the height H of the shoulder, the round corner R of the shoulder and the radial included angle α of the inclined shoulder, the structural parameters of the matched sealing ring are continuously determined:
the inner diameter D of the sealing ring is equal to D +0.1 mm;
the width H of the sealing ring is H-1 mm;
the fillet r of the sealing ring is 1.0 mm; (R is 0.6mm)
The radial included angle α (radial included angle of inclined shoulder) of the sealing ring is 30 deg
The thickness t of the sealing ring is 5.3 mm; (t.gtoreq.5.25 mm)
The sealing ring is sleeved on the cylindrical surface of the outer shoulder of the male end, and the sealing ring is extruded and deformed by the male shoulder and the female shoulder along with the screwing of the threads until the inner shoulders are completely butted and contacted, and then the sealing ring is stopped. The sealing ring is extruded and deformed to a designed gap of 3mm, and the sealing ring forms a contact pressure stress sigma of 121.5Mpa in a shoulder gap, so that the intrusion of an external pressure medium can be effectively blocked.
It should be noted that, in this embodiment, the inner shoulder of the direct-connection type sleeve joint is an opposite shoulder, which plays a key role in ensuring interference and screwing positioning of the metal sealing surface of the joint, and the sealing ring is disposed at the outer shoulder of the sleeve.
L1 male end connection length, L2 female end connection length, t 1-L1-L2, △ t-t1
sigma-E- △ t/t-E-t (t-t1)/t is not less than k-P;
and (3) knowing the property E of the sealing ring material, determining a proper safety coefficient K and an external pressure P according to the working condition, and calculating the minimum thickness t of the sealing ring according to the shoulder gap width t1 which can be determined by the joint structure design.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (4)
1. The utility model provides an enhancement mode seal structure of direct connection type sleeve joint which characterized in that: a sealing ring is filled in a gap formed by the male and female shoulders of the joint of the direct-connection type sleeve joint in an interference manner;
the gap formed by the male shoulder and the female shoulder of the connector is wide inside and narrow outside, the male end of the gap of the shoulders is an inclined shoulder, the female end of the gap of the shoulders is a straight shoulder, the gap forms a right-angled trapezoid structure, and the radial included angle α of the inclined shoulder is 20-60 degrees;
wherein, the cross-sectional shape of the seal ring is matched with the shoulder clearance; the outer diameter D of the cylindrical surface of the shoulder and the inner diameter D of the sealing ring meet the condition that D is less than or equal to D, and D-D is 0.1-0.3 mm; the male end shoulder fillet R and the sealing ring fillet R meet the condition that R is less than or equal to R, and R is 0.3-1 mm, and R is 1-1.5 mm; the height H of the shoulder and the width H of the sealing ring meet the condition that H is larger than H, and H-H is 1-1.5 mm.
2. The enhanced sealing structure of a direct connection type sleeve joint according to claim 1, wherein: the sealing washer material is PTFE hard material, and the thickness of sealing washer satisfies:
σ＝E*△t/t≥k*P
the method comprises the steps of measuring the initial thickness of a t-sealing ring, measuring the axial deformation of the △ t-sealing ring, measuring the compression elastic modulus of an E-sealing ring, measuring the contact stress between the sigma-sealing ring and a shoulder, measuring the pressure of a P medium, measuring the pressure of the sigma-sealing ring, and measuring the k-safety coefficient.
3. The enhanced sealing structure of a direct connection type sleeve joint according to claim 1, wherein: the direct-connection type sleeve joint is provided with at least one pair of non-opposite shoulders, a shoulder gap exists after assembly, and the gap range is 2-4 mm.
4. The enhanced sealing structure of a direct connection type sleeve joint according to claim 1, wherein: the clearance formed by the male shoulder and the female shoulder of the connector can be an outer shoulder clearance or an inner shoulder clearance.
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| CN202010242574.5A CN111322017B (en) | 2020-03-31 | 2020-03-31 | Enhanced sealing structure of direct-connection sleeve joint |
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| CN202010242574.5A CN111322017B (en) | 2020-03-31 | 2020-03-31 | Enhanced sealing structure of direct-connection sleeve joint |
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| CN111322017B CN111322017B (en) | 2024-07-05 |
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2020
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|---|---|---|---|---|
| CA1084545A (en) * | 1977-10-17 | 1980-08-26 | Winfred J. Wiese | Mechanical seal assembly |
| CN1030285A (en) * | 1987-06-29 | 1989-01-11 | 达尔米尼合股公司 | Sleeveless tubes for hydrocarbon pumping pipes |
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