CN201526668U - Metal sealing structure for high-temperature and high-pressure connection - Google Patents
Metal sealing structure for high-temperature and high-pressure connection Download PDFInfo
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- CN201526668U CN201526668U CN2009200489690U CN200920048969U CN201526668U CN 201526668 U CN201526668 U CN 201526668U CN 2009200489690 U CN2009200489690 U CN 2009200489690U CN 200920048969 U CN200920048969 U CN 200920048969U CN 201526668 U CN201526668 U CN 201526668U
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Abstract
The utility model discloses a metal sealing structure for high-temperature and high-pressure connection, comprising three parts, namely, an upper sealing head flange (1), a metal sealing gasket (4) and a cylinder end part flange (8), wherein a sealed surface between the upper sealing head flange (1) and the cylinder end part flange is provided with a metal sealing gasket; the section of the metal sealing gasket and the section of the sealed surface between the upper sealing head flange (1) and the cylinder end part flange are respectively an angle provided with two edges, the angle is 70-110 degrees, and the shapes of the two sections are coincident; a conical surface is formed by the sections of two edges of the angle, namely, the contact surfaces of the upper sealing head flange (1) with the cylinder end part flange and the metal sealing gasket, the sections of the two sides are provided with toothed shape; the upper sealing head flange and the cylinder end part flange are provided with bolt holes (2) which are uniformly distributed and used for installing main bolts; the lower part of the upper sealing head flange (1) and the corresponding position of an arranged support ring (11) are provided with bolt holes (12) used for installing bolts; and the metal sealing gasket is fixed in the sealing groove of the upper sealing head flange by the support ring.
Description
Technical field
The utility model relates to a kind of sealing configuration, and especially High Temperature High Pressure connects and to use sealing configuration, can be used for the metallic seal linkage structure that High Temperature High Pressure and temperature, pressure all have pressurized container or other process device of fluctuation more specifically to a kind of.
Background technique
Pad is the key element that influence connects sealability.Along with pressurized container and pipeline develop to high temperature, high pressure and maximization direction, sealing is had higher requirement to High Temperature High Pressure.With regard to the High Temperature High Pressure seal element, that uses at present mainly contains the sealing of metal plain cushion, biconical ring seal, the sealing of C type ring, metal-O-ring sealing, octangonal ring sealing and seal with metal lens ring etc.Domestic and international many units and technical community have been carried out the metallic shim Research on Seal one after another.
The theoretical research aspect, abroad, Kollmann is according to Hooke's law, bullet, plastic stress strain under the high pressure operating mode analyzed to the metal plain cushion, find that under high pressure the metal plain cushion significant resiliently deformable takes place and influences its sealability, has obtained corresponding ess-strain formula.The metal plain cushion design that is established as of ess-strain formula provides theoretical foundation.The influence of surface roughness that Thomas has adopted G-W and the scale-model investigation of M-R Elastic Contact to the metallic seal Surface deformation, studies show that surface topography is very big to the metallic seal performance impact, under identical seal degree, make the contact area of sealing surface produce the needed contact force of resiliently deformable not necessarily less than producing the needed contact force of plastic deformation, the coarse more this situation of contact surface is obvious more.Korndorf has described the computational methods of biconical ring seal in detail, and the bipyramid ring of having considered to have frictional force in the method is because of the additional bolts power that inner pressuring load produced, but has ignored the bipyramid ring stress that is produced by pretightening force.Bertsch etc. have derived the bolt force of bipyramid ring and the relation of seal pressure and interior pressure, thereby can calculate effective sealing force of bipyramid ring more exactly.
At home, the deformation compatibility condition that Lanzhou petro-Chemical Machine Factory's two subsidiary factory's technology groups connect according to biconical ring seal, describe with analytic method that the biconical ring seal structure is boosted and the working procedure of step-down, proposed the bolt force of each working stage and the analytic relationship of sealing force and pressure loading, and attempted with in addition intuitively explanation of the mechanics diagram simplified.Nest is built the big high pressure that exceeds critical field and the stressing conditions of major diameter octangonal ring analyzed theoretically, provided the formula of bolt load under pretension and the operating conditions, the calculating of bolt load is not based on m, y value in this formula, but, and notice when having proposed design using octangonal ring relevant with scantling, the friction angle of pretension specific pressure, operation pressure, bolt and octangonal ring.Liang Naizhang has analyzed the problem that exists in the German-style metal lensring connected system bolt load formula of present domestic employing, has inquired into the influence to bolt load of frictional force, medium kind and working pressure emphatically, and has proposed preliminary improvement idea.Feng Xiu and Gu Baiqin are by measuring the metallic shim sealing surfaces profilogram under the different pressure stress, studied the fractal characteristic of metallic shim sealing surfaces pattern according to Fractal Geometry Theory, adopt fractal dimension, scale coefficient and the characteristic dimension coefficient of structure function method gauging surface profile, inquired into the influence of pressure stress to fractal parameter, and according to Fractal Geometry Theory, in conjunction with the incompressible viscous fluid laminar flow theory, foundation is leaked model based on the metallic shim of fractal parameter, and this model has disclosed the relation between leak-down rate and the sealing surfaces pattern.
The experimental research aspect, abroad, Buchter seals metallic shim and has carried out a series of experimental study discovery, make the contact force of the contact area generation resiliently deformable of metallic sealing section can not form high voltage bearing tight seal, only when the sealing contact force makes surface of contact produce permanent deformation, can form sealing, and the sealing contact force is the twice of gasket material yield strength.The seal element that high pressure sealing connects does not need very high surface finishment.Bazergui has carried out experimental study to oval ring, found that the increase along with pad stress, and leak-down rate underspeeds very fast, and after reaching a certain pad stress, leak-down rate is very little with the pad STRESS VARIATION.The thin polycarbonate (PC) film of utilizations such as Matsuzaki Yoshil has been observed metal plain cushion contact condition.
At home, various metallic shim experimental studies are also very active.Hefei General Machinery research Institute's high pressure sealing course group has been carried out leakage test to the metal "O of φ 1000mm, explored bolt pretightening, flattening degree, temperature and radially the changing of the relative positions sealability is influenced, compared the sealability of all size "O.Lee presses and bright two kinds of small size stainless steel "Os has been carried out mechanical property and experiments of sealing performance research and elastic strength analysis, has set up the relation of linear sealing specific pressure and tightness coefficient.The result of study of Wang Liye and Wang Xuewen etc. shows, no matter is octangonal ring, or oval ring, and the hardness of gasket material and the roughness of sealing surface are all influential to sealability, and the influence degree of roughness is more much smaller than the influence of hardness.Shi Zehua etc. have carried out the research of normal temperature firm gas tightness test to the hollow metal "O, studies show that hollow metal "O sealability in the helium medium is good, and can reuse.High pressure seminar of Hefei General Machinery research Institute tests biconical ring seal, has explored the sealing mechanism of bipyramid ring at pretension stage and working stage, has pointed out to influence the principal element of biconical ring seal, preliminary identification the design method of biconical ring seal.Zhong Daming has analyzed sealing characteristics parameter, seal f ace width and the sealing surface contact condition etc. that add aluminium pad bipyramid ring according to a large amount of tests.Zhang Liquan etc. have carried out experimental study to seal with metal lens ring, find rationally to choose the important assurance that pretightening force is the German-style metal lensring reliable sealing.In novelty the sealability of metal lens pad has been done deep experimental study, the factors such as pressure medium, specific pressure, surface roughness, medium kind of having inquired into are to the seal with metal lens ring Effect on Performance.Hu Shaobo etc. have carried out experimental study to the ambient temperature mechanical properties and the sealability of metal octangonal ring, the formula method for expressing of compression recovery performance and sealability has been proposed, regression analysis by test data has obtained the coefficient in the formula, on this basis, set up a kind of new method of definite octangonal ring prefastening load.
Although both at home and abroad doing a large amount of work aspect the theory of metallic shim and the experimental research, when operating conditions was relatively harsher, under all having than the great fluctuation process situation at high temperature, high pressure and temperature and pressure, the situation that metallic seal takes place to leak still took place frequently.This certainly will cause equipment or unit by forced-stopping machine, brings bigger economic loss, even causes the accident.At above problem, design a kind of sealing surface and had the profile of tooth pattern, resilience is good and have a metallic seal linkage structure of self-tightening effect.This structure can realize operating mode downforce container that High Temperature High Pressure and temperature and pressure fluctuation ratio are bigger and effective sealing of pipeline.
Summary of the invention
The purpose of this utility model is: solve in the bigger occasion downforce container of high temperature, high pressure and temperature and pressure fluctuation and the problem of seal for pipe joints difficulty, provide a kind of High Temperature High Pressure to connect and use the metallic seal linkage structure, plastic deformation takes place to form linear sealing in this metal gasket easily under the prefastening load effect, goes up the problem of the conical surface contact stress following conical surface contact stress of the less than normal and interior pressure effect seal failure that causes less than normal down thereby overcome the pretension effect; The bipyramid structure that the inboard has " C " type groove makes the pad resilience good, and has the self-tightening effect, can realize the effective sealing under the complex working condition condition.
The technical solution of the utility model is as follows: High Temperature High Pressure connects uses shape metallic leak-proof structure, comprises upper cover flange, metallic packing and cylindrical shell end flange three parts composition.Sealing surface between upper cover flange and the cylindrical shell end flange is provided with metallic packing, and the cross section of the sealing surface between the cross section of metallic packing and upper cover flange and the cylindrical shell end flange all is the angles with two limits, its angle is 70-110 °, and the shape in two cross sections is coincide; The surface of contact of upper cover flange and cylindrical shell end flange and metallic packing is that two limits at angle constitute conical surface, article two, has profile of tooth on limit (cross section), upper cover flange and cylindrical shell end flange are provided with equally distributed bolt hole, are used to install kingbolt, provide impacting force to realize sealing.The relevant position is provided with bolt hole on upper cover flange bottom and the filler ring, is used for construction bolt, with filler ring metallic packing is fixed in the upper cover flange sealing trough.
Upper cover flange 1 has identical gradient with the surface of contact of cylindrical shell end flange and metallic packing, the upper and lower sealing surface of metallic packing is a conical surface 6,7, has profile of tooth (pattern) on two limits (cross section) of conical surface, when the effect lower flange of pretightening force contacts with metallic packing, plastic deformation takes place with the realization linear sealing in metallic packing easily, thereby can overcome the problem that goes up the seal failure that causes less than normal of the conical surface contact stress following conical surface contact stress of less than normal and interior pressure effect under the pretension effect.
Improvement of the present utility model is: the major character of metallic seal linkage structure is that this metallic seal not only has the advantage of seal with double-cone, and the inboard has one " C " type groove 5 in the cross section at formation angle, two limits of metallic packing, it has effectively increased the resilience of pad, reduce bolt pretightening, for installation brings convenience.This metallic seal linkage structure as shown in Figure 4.
The beneficial effects of the utility model are: metallic seal linkage structure of the present utility model is simple, processing request is not high, easy accessibility, required bolt pretightening is less, and can realize that High Temperature High Pressure and temperature and pressure all have the effective sealing than great fluctuation process occasion downforce container and pipeline.
Description of drawings:
Fig. 1 is the flange schematic cross-section
Fig. 2 is the metallic packing schematic cross-section
Fig. 3 is a cylindrical shell end cross-sectional schematic representation
Fig. 4 is a metallic seal linkage structure schematic representation
Wherein: 1-upper cover flange, 2-bolt hole, 3-seal groove, 4-metallic packing, 5-" C " type groove, the last conical surface of 6-, the conical surface under the 7-, 8-cylindrical shell end flange, 9-kingbolt, 10-packing ring, 11-filler ring, 12-bolt
Embodiment
The utility model comprises upper cover flange 1, metallic packing 4 and cylindrical shell end flange 8 three parts composition.Sealing surface between upper cover flange 1 and the cylindrical shell end flange is provided with metallic packing, and the cross section of the sealing surface between the cross section of metallic packing and upper cover flange 1 and the cylindrical shell end flange all is the angles with two limits, its angle is 70-110 °, and the shape in two cross sections is coincide; Upper cover flange 1 is two limits formation conical surfaces at angle with the surface of contact of cylindrical shell end flange and metallic packing, article two, has profile of tooth (pattern) on limit (cross section), upper cover flange and cylindrical shell end flange are provided with equally distributed bolt hole 2, be used to install kingbolt 9, provide impacting force to realize sealing.The relevant position is provided with bolt hole on upper cover flange bottom and the filler ring 11, is used for construction bolt 12, with filler ring metallic packing is fixed in the upper cover flange sealing trough.
After the manufacturing of finishing all component, in factory, should adopt the method for vertical assembling, earlier with metallic packing by filler ring be bolted in the upper cover flange sealing trough, again itself and cylindrical shell are assembled, tighten kingbolt.Can carry out the hydrostatic test in factory after device assembles finishes, pass the test just can drop into normal use.
Claims (2)
1. High Temperature High Pressure connects and to use shape metallic leak-proof structure, it is characterized in that comprising upper cover flange (1), metallic packing (4) and cylindrical shell end flange (8) three parts composition, sealing surface between upper cover flange (1) and the cylindrical shell end flange is provided with metallic packing, and the cross section of the sealing surface between the cross section of metallic packing and upper cover flange (1) and the cylindrical shell end flange all is the angles with two limits, its angle is 70-110 °, and the shape in two cross sections is coincide; Upper cover flange (1) is the section constitution conical surface on two limits at angle with the surface of contact of cylindrical shell end flange and metallic packing, article two, has profile of tooth on the cross section on limit, upper cover flange and cylindrical shell end flange are provided with the equally distributed bolt hole (2) that is used to install kingbolt, upper cover flange bottom and the filler ring (11) that is provided with are gone up the relevant position and are provided with the bolt hole (12) that is used for construction bolt, with filler ring metallic packing are fixed in the upper cover flange sealing trough.
2. High Temperature High Pressure according to claim 1 connects uses shape metallic leak-proof structure, it is characterized in that having one " C " type groove (5) in the inboard in the cross section on two limits at metallic packing angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200489690U CN201526668U (en) | 2009-10-30 | 2009-10-30 | Metal sealing structure for high-temperature and high-pressure connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200489690U CN201526668U (en) | 2009-10-30 | 2009-10-30 | Metal sealing structure for high-temperature and high-pressure connection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201526668U true CN201526668U (en) | 2010-07-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200489690U Expired - Fee Related CN201526668U (en) | 2009-10-30 | 2009-10-30 | Metal sealing structure for high-temperature and high-pressure connection |
Country Status (1)
| Country | Link |
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| CN (1) | CN201526668U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104024705A (en) * | 2012-01-20 | 2014-09-03 | 超级高压有限公司 | Sealing ring for container |
| CN104455435A (en) * | 2014-11-26 | 2015-03-25 | 天津太钢天管不锈钢有限公司 | High-temperature seal assembly |
| CN110333057A (en) * | 2019-07-02 | 2019-10-15 | 合肥海川石化设备有限公司 | A kind of deep well submerged electric pump motor water pressure test tank |
-
2009
- 2009-10-30 CN CN2009200489690U patent/CN201526668U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104024705A (en) * | 2012-01-20 | 2014-09-03 | 超级高压有限公司 | Sealing ring for container |
| CN104455435A (en) * | 2014-11-26 | 2015-03-25 | 天津太钢天管不锈钢有限公司 | High-temperature seal assembly |
| CN110333057A (en) * | 2019-07-02 | 2019-10-15 | 合肥海川石化设备有限公司 | A kind of deep well submerged electric pump motor water pressure test tank |
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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: 20100714 Termination date: 20181030 |