CN102367898B - Thin-wall flange flat-groove dual seal structure used under complex working condition and application thereof - Google Patents
Thin-wall flange flat-groove dual seal structure used under complex working condition and application thereof Download PDFInfo
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- CN102367898B CN102367898B CN201110284178XA CN201110284178A CN102367898B CN 102367898 B CN102367898 B CN 102367898B CN 201110284178X A CN201110284178X A CN 201110284178XA CN 201110284178 A CN201110284178 A CN 201110284178A CN 102367898 B CN102367898 B CN 102367898B
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Abstract
The invention provides a thin-wall flange flat-groove dual seal structure used under a complex working condition and application thereof. The thin-wall flange flat-groove dual seal structure is characterized in that: an end surface of a lower flange, which is in contact with an upper flange, is provided with two annular grooves; one annular groove at the outer side is a seal groove in which a rubber seal member is assembled, and the annular groove at the inner side is a flat groove in which a polytetrafluoroethylene gasket is assembled; the rubber seal member is arranged in the seal groove in which the rubber seal member is assembled, and the rubber seal member has the compression amount of 25-40%; and a gasket is arranged in the flat groove in which the polytetrafluoroethylene gasket is assembled, and is matched with the groove in shape, the height of the gasket is more than a depth value of the flat groove by 0.5-1.0mm, in addition, the volume filling rate of the polytetrafluoroethylene gasket in the flat groove is 75-100%. According to the invention, the flange dual seal structure is adopted, the rubber seal member of the seal structure undergoes flange deformation in a use process within a wide temperature range from low temperature to limit high temperature, and no surplus substances are generated after the rubber seal member is in contact with a strong corrosive medium and undergoes sealed usage at the limit high temperature.
Description
Technical field
The present invention relates to the sealing configuration under a kind of complex working conditions, be specifically related to a kind of thin-wall flange flat-groove double-channel sealing structure and application for complex working conditions.
Background technique
Rubber seal is simple with its sealing configuration form, sealing reliability is high and used widely.Under the prerequisite that requires to allow in sealing technique, rubber seal always is first-selected scheme for sealing.Usually, according to requirements such as serviceability temperature, Environmental Conditions, sealing loads, select corresponding rubber seal, flange facing reaches tight seamless link about requiring simultaneously, thereby guarantees the reliable sealing requirement.Yet, under some particular case, owing to be subject to the restriction of assembly space constraint and loss of weight requirement, can't design large-scale thick and heavy sealing configuration, require the flange design of sealing configuration necessary lightweight, thin thickness, assembling flexibly, this kind sealing configuration can produce distortion in assembly process, and in the applied at elevated temperature process, also can produce distortion, these distortion all cause the flange facing increase of cracking, therefore, use the conventional seals structural design of rubber seal, can't satisfy the sealing usage requirement, need to carry out and satisfy the lightweight that sealing is used about rubber seal, assemble the sealing configuration research that produces distortion in flexible and the using process.On the other hand, the General Purpose Rubber material produces fifth wheel in elevated-temperature seal using process meeting after contacting with strong corrosive medium, affect the normal use of the exquisite systems such as valve.
Summary of the invention
The purpose of this invention is to provide a kind of thin-wall flange flat-groove double-channel sealing structure and application for complex working conditions, its rubber seal produces to the wide temperature range using process of its limit high temperature at low temperature and does not produce fifth wheel after flange distortion and rubber seal contact with strong corrosive media after its limit high temperature lower seal uses.Described flange distortion comes from the distortion that produces in distortion that normal temperature assembling produces and the elevated-temperature seal using process, and the distortion that the normal temperature assembling produces makes up and down the flanged surface outside maximum of cracking reach 0.2mm; Maximum reaches 2.5mm so that crack in flange inside in the distortion that produces in the elevated-temperature seal using process, and the sealing surface of placing the rubber seal place maximum of cracking reaches 1.5mm.
A kind of thin-wall flange flat-groove double-channel sealing structure for complex working conditions of the present invention, wherein upper flange and lower flange dock, and pass being fastenedly connected of upper flange and the lower flange upper lower flange of realization by several parts that apply the flange pretightening force of circumferential setting; It offers the twice annular groove at the lower flange end face that contacts with upper flange; One annular groove in the outside is the seal groove of assembling rubber seal, and one inboard annular groove risen as high as the banks for the assembling teflon gasket; Place rubber seal in the seal groove of assembling rubber seal, the decrement of this rubber seal is 25%～40%; At the pad that the interior placement of rising as high as the banks of assembling teflon gasket matches with its shape, the height of this pad is greater than the depth value 0.5～1.0mm that rises as high as the banks, and the volume fill factor of teflon gasket in rising as high as the banks is 75～100%.
A kind of thin-wall flange flat-groove double-channel sealing structure for complex working conditions of the present invention, wherein lower flange embeds in the upper flange, block lower flange by the kink ring again, several parts that apply the flange pretightening force by circumferential setting pass being fastenedly connected of kink ring and the upper flange upper lower flange of realization simultaneously; It is offering annular groove with the lower flange top outer side surface of upper flange contact, is the seal groove of assembling rubber seal; On the lower flange end face of upper flange contact, also offer annular groove, be rising as high as the banks of assembling pad; The assembling rubber seal seal groove in place rubber seal, this rubber seal decrement 25%～40%; At the pad that the interior placement of rising as high as the banks of assembling teflon gasket matches with its shape, the height of this pad is greater than the depth value 0.5～1.0mm that rises as high as the banks, and the volume fill factor of teflon gasket in rising as high as the banks is 75～100%.
A kind of thin-wall flange flat-groove double-channel sealing structure for complex working conditions of the present invention, wherein lower flange docks with upper flange, the external diameter of lower flange is less than the external diameter of upper flange, block lower flange by the kink ring again, several parts that apply the flange pretightening force by circumferential setting pass being fastenedly connected of kink ring and the upper flange upper lower flange of realization simultaneously, it offers the twice annular groove at the lower flange end face that contacts with upper flange, one annular groove in the outside is the seal groove of assembling rubber seal, and one inboard annular groove risen as high as the banks for the assembling pad; The assembling rubber seal seal groove in place rubber seal, this rubber seal decrement 25%～40%; At the pad that the interior placement of rising as high as the banks of assembling teflon gasket matches with its shape, the height of this pad is greater than the depth value 0.5～1.0mm that rises as high as the banks, and the volume fill factor of teflon gasket in rising as high as the banks is 75～100%.
Aforesaid a kind of thin-wall flange flat-groove double-channel sealing structure for complex working conditions, its described interior rubber seal material selection fluorine rubber or fluoroether rubber or ethylene propylene rubber of seal groove that is placed on the assembling rubber seal.
Aforesaid a kind of thin-wall flange flat-groove double-channel sealing structure for complex working conditions, its described upper flange or lower flange are selected steel or aluminium material; The end surface thickness of described upper flange or lower flange is at 8mm～10mm.
Aforesaid a kind of thin-wall flange flat-groove double-channel sealing structure for complex working conditions, its described parts that apply the flange pretightening force are screw bolt and nut.
The application of the thin-wall flange flat-groove double-channel sealing structure for complex working conditions of the present invention, this flange flat-groove double-channel sealing structure are applied to-60 ℃ of wide temperature ranges sealings to rubber seal limit high temperature and use; Flange produces under the texturizing condition and rubber seal contacts with strong corrosive media afterwards and do not produce fifth wheel at its limit applied at elevated temperature in the using process.
The application of aforesaid a kind of thin-wall flange flat-groove double-channel sealing structure for complex working conditions, its described flange distortion comes from the distortion that produces in distortion that normal temperature assembling produces and the elevated-temperature seal using process, and the distortion that the normal temperature assembling produces makes up and down the flanged surface outside maximum of cracking reach 0.2mm; Maximum reaches 2.5mm so that crack in flange inside in the distortion that produces in the elevated-temperature seal using process, and the sealing surface of placing the rubber seal place maximum of cracking reaches 1.5mm.
The application of aforesaid a kind of thin-wall flange flat-groove double-channel sealing structure for complex working conditions, its described strong corrosive media is dinitrogen tetroxide gas or uns-dimethylhydrazine gas.
Effect of the present invention is:
Of the present invention for the flange flat-groove double-channel sealing structure under the complex working conditions, adopt flange double-channel sealing structure form, inner seal adopts teflon gasket, rubber seal is adopted in outer side sealing, solved the sealing problem of strong corrosive medium environment lower seal structure under texturizing condition, described distortion comes from the distortion that produces in distortion that normal temperature assembling produces and the elevated-temperature seal using process, and wherein the distortion that produces of normal temperature assembling makes up and down the flanged surface outside maximum of cracking reach 0.2mm; Maximum reaches 2.5mm so that crack in flange inside in the distortion that produces in the elevated-temperature seal using process, and the sealing surface of placing the rubber seal place maximum of cracking reaches 1.5mm.
The present invention has carried out respectively above-mentioned sealing configuration flange in the wide temperature range using process of-60 ℃～rubber seal limit high temperature and has produced under the texturizing condition and rubber seal contact with strong corrosive media afterwards and simulates certification test in the sealing of its limit applied at elevated temperature, test result shows that sealing configuration does not leak, and does not produce fifth wheel.Wherein, the maximum of cracking outside the flanged surface about the distortion of normal temperature assembling generation makes reaches 0.2mm; Maximum reaches 2.5mm so that crack in flange inside in the distortion that produces in the elevated-temperature seal using process, and the sealing surface of placing the rubber seal place maximum of cracking reaches 1.5mm.
Description of drawings
Fig. 1 is that embodiment 1 is described a kind of for the flange flat-groove double-channel sealing structure schematic representation under the complex working conditions;
Fig. 2 is that embodiment 3 is described a kind of for the flange flat-groove double-channel sealing structure schematic representation under the complex working conditions.
Fig. 3 is that embodiment 6 is described a kind of for the flange flat-groove double-channel sealing structure schematic representation under the complex working conditions.
Among the figure: the 1-upper flange; The 2-lower flange; Rising as high as the banks of 3-assembling teflon gasket; The seal groove of 4-assembling rubber seal; 5-applies the parts of flange pretightening force; 6-kink ring.
Embodiment
A kind ofly be further described for flange flat-groove double-channel sealing structure and application under the complex working conditions of the present invention below in conjunction with the drawings and specific embodiments.
Embodiment 1
As shown in Figure 1, a kind of for the flange flat-groove double-channel sealing structure under the complex working conditions, wherein upper flange 1 and lower flange 2 dock, and pass being fastenedly connected of upper flange 1 and the lower flange 2 upper lower flanges of realization by several parts 5 (screw bolt and nut) that apply the flange pretightening force of circumferential setting.The material of flange is 5A06, and the upper flange end surface thickness is 10mm; The material of lower flange is 1Cr18Ni9Ti, and the lower flange end surface thickness is 8mm.
Offer the twice annular groove at lower flange 2 end faces that contact with upper flange 1;
One annular groove in the outside is the seal groove 4 of assembling rubber seal, and the width of seal groove 4 is 4mm, and groove depth is 2.25mm.One inboard annular groove rises as high as the banks 3 for the assembling teflon gasket, and 3 the groove width of rising as high as the banks is 2mm, and groove depth is 1mm.
At the seal groove 4 interior fluoroether rubber O-ring seals of placing Ф 3 of assembling rubber seal, the decrement of this rubber seal is 25%.
At the pad that the 3 interior placements of rising as high as the banks of assembling teflon gasket match with its shape, the height 2mm of this pad, width 1mm.And the volume fill factor of teflon gasket in rising as high as the banks is 100%.
Above-mentioned as follows for the flange flat-groove double-channel sealing structure assembly process under the complex working conditions: as teflon gasket to be installed on to rise as high as the banks 3, the fluoroether rubber O-ring seals is installed in the seal groove 4.Adopt torque spanner, each bolt is tightened symmetrically, minutes 4～5 times bolt tightening moment is added to 20N.m, then, along the circumferential direction calibrates moment twice.Adopt feeler gauge, recording maximal clearance, the lower flange outside is 0.2mm.
The double-channel sealing structure of rising as high as the banks for above-mentioned assembling, carried out respectively-60 ℃ of leakage tests, the leakage test under (contact the is 0.4MPa) condition that contacts 150 hours at 40 ℃ with the dinitrogen tetroxide gas phase media, with normal temperature after the dinitrogen tetroxide gas phase media contacts, low temperature-20 ℃ and high temperature 360 ℃ of (test periods 10 minutes, test pressure 0.9MPa) leakage test, test result shows: all do not leak in above-mentioned process of the test.After test tool was cooled to normal temperature, through overhaul, cracked and reach 2.05mm in test flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 1.08mm, does not have fifth wheel in the cavity of test tool.
As a comparison, for the single track sealing structure (other condition is same as above) that does not comprise that the assembling teflon gasket is risen as high as the banks, carried out respectively corresponding test, test result shows :-60 ℃ of leakage test processes are leaked, normal temperature, low temperature seal process of the test behind medium contact process and the medium contact are not leaked, 360 ℃ of leakage test processes of high temperature are leaked.After test tool was cooled to normal temperature, through overhaul, cracked and reach 2.02mm in test flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 1.05mm, and the fluoroether rubber Sealing is extruded into test tool cavity inward flange.
Embodiment 2
As shown in Figure 1, a kind of for the flange flat-groove double-channel sealing structure under the complex working conditions, wherein upper flange 1 and lower flange 2 dock, and pass being fastenedly connected of upper flange 1 and the lower flange 2 upper lower flanges of realization by several parts 5 (screw bolt and nut) that apply the flange pretightening force of circumferential setting.The material of upper flange is 2A14, and the upper flange end surface thickness is 10mm; The material of lower flange is 1Cr18Ni9Ti, and the lower flange end surface thickness is 8mm.
Offer the twice annular groove at lower flange 2 end faces that contact with upper flange 1;
One annular groove in the outside is the seal groove 4 of assembling rubber seal, and the width of seal groove 4 is 4mm, and groove depth is 1.8mm.One inboard annular groove rises as high as the banks 3 for the assembling teflon gasket, and 3 the groove width of rising as high as the banks is 2mm, and groove depth is 1mm.
At the seal groove 4 interior ethylene propylene rubber O-ring seals of placing Ф 3 of assembling rubber seal, the decrement of this rubber seal is 40%.
At the pad that the 3 interior placements of rising as high as the banks of assembling teflon gasket match with its shape, the height 1.5mm of this pad, width 1mm.The volume fill factor of teflon gasket in rising as high as the banks is 75%.
Above-mentioned as follows for the flange flat-groove double-channel sealing structure assembly process under the complex working conditions: as teflon gasket to be installed on to rise as high as the banks 3, the ethylene propylene rubber O-ring seals is installed in the seal groove 4.Adopt torque spanner, each bolt is tightened symmetrically, minutes 4～5 times bolt tightening moment is added to 20N.m, then, along the circumferential direction calibrates moment twice.Adopt feeler gauge, recording maximal clearance, the lower flange outside is 0.2mm.
The double-channel sealing structure of rising as high as the banks for above-mentioned assembling, carried out respectively-60 ℃ of leakage tests, the leakage test under (contact the is 0.5MPa) condition that contacts 150 hours at 40 ℃ with the uns-dimethylhydrazine gas phase media, with normal temperature after the uns-dimethylhydrazine gas phase media contacts, low temperature-20 ℃ and high temperature 345 ℃ of (test periods 10 minutes, test pressure 0.95MPa) leakage test, test result shows: all do not leak in above-mentioned process of the test.After test tool was cooled to normal temperature, through overhaul, cracked and reach 1.75mm in test flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 0.85mm, does not have fifth wheel in the cavity of test tool.
As a comparison, for the single track sealing structure (other condition is same as above) that does not comprise that the assembling teflon gasket is risen as high as the banks, carried out respectively corresponding leakage test, test result shows :-60 ℃ of leakage test processes are leaked, normal temperature, low temperature seal process of the test behind medium contact process and the medium contact are not leaked, 345 ℃ of leakage test processes of high temperature are leaked.After test tool was cooled to normal temperature, through overhaul, cracked and reach 1.72mm in test flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 0.84mm, and the black paint-like substance is arranged in the test tool cavity.
Embodiment 3
As shown in Figure 2, a kind of for the flange flat-groove double-channel sealing structure under the complex working conditions, wherein lower flange 2 embeds in the upper flange 1, block lower flange 2 by kink ring 6 again, several parts 5 (screw bolt and nut) that apply the flange pretightening force by circumferential setting pass being fastenedly connected of kink ring 6 and the upper flange 1 upper lower flange of realization simultaneously.The material of upper flange is 2A12, and the upper flange end surface thickness is 18mm; The material of lower flange is 1Cr18Ni9Ti, and the lower flange end surface thickness is 8mm.
Offering annular groove with the lower flange 2 top outer side surfaces of upper flange 1 contact, be the seal groove 4 of assembling rubber seal, the width of seal groove 4 is 2.25mm, and groove depth is 4mm.At the seal groove 4 interior fluororubber O shape Sealings of placing Ф 3 of assembling rubber seal, this rubber seal decrement is 25%;
On lower flange 2 end faces of upper flange 1 contact, also offering annular groove, for the assembling pad rise as high as the banks 3, groove width is 2mm, groove depth is 1mm.At the pad that the 3 interior placements of rising as high as the banks of assembling teflon gasket match with its shape, the height 1.5mm of this pad, width are 1mm.The volume fill factor of teflon gasket in rising as high as the banks is 75%.
Above-mentioned as follows for the flange flat-groove double-channel sealing structure assembly process under the complex working conditions: as teflon gasket to be installed on to rise as high as the banks 3, fluorine rubber seal element is installed in the seal groove 4, place the kink ring at the lower flange place, then adopt torque spanner, each bolt is tightened symmetrically, bolt tightening moment is added to 20N.m minutes for 4～5 times, then, along the circumferential direction calibrates moment twice.Adopt feeler gauge, recording maximal clearance, the lower flange outside is 0.2mm.
The double-channel sealing structure of rising as high as the banks for above-mentioned assembling, carried out respectively-60 ℃ of leakage tests, the leakage test under (contact the is 0.5MPa) condition that contacts 150 hours at 40 ℃ with the uns-dimethylhydrazine gas phase media, with normal temperature after the uns-dimethylhydrazine gas phase media contacts, low temperature-20 ℃ and high temperature 355 ℃ of (test periods 10 minutes, test pressure 0.85MPa) leakage test, test result shows: all do not leak in above-mentioned process of the test.After test tool was cooled to normal temperature, through overhaul, cracked and reach 1.83mm in test flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 0.92mm, does not have fifth wheel in the cavity of test tool.
As a comparison, for the single track sealing structure (other condition is same as above) that does not comprise that the assembling teflon gasket is risen as high as the banks, carried out respectively corresponding leakage test, test result shows :-60 ℃ of leakage test processes are leaked, normal temperature, low temperature seal process of the test behind medium contact process and the medium contact are not leaked, 355 ℃ of leakage test processes of high temperature are leaked.After test tool was cooled to normal temperature, through overhaul, cracked and reach 1.82mm in test flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 0.91mm, and the black paint-like substance is arranged in the test tool cavity.
In addition as a comparison, fluorine rubber seal element in the above-mentioned single track sealing structure is replaced with hollow metal O shape ring, the width design of seal groove is 4.2mm, groove depth is designed to 2.25mm, placing cross-section size in this groove is the hollow metal O-ring packing of Ф 3, other condition is same as above, carried out respectively corresponding leakage test, test result shows: normal temperature, the low temperature seal process of the test behind-60 ℃ of leakage tests, medium contact process and medium contacts do not leaked, 355 ℃ of leakage test processes of high temperature are leaked.After test tool was cooled to normal temperature, through overhaul, cracked and reach 1.82mm in test flange inside, and the sealing surface of placing the Sealing place cracks and reaches 0.9mm, and the test tool cavity is interior without fifth wheel.
Embodiment 4
As shown in Figure 2, a kind of for the flange flat-groove double-channel sealing structure under the complex working conditions, wherein lower flange 2 embeds in the upper flange 1, block lower flange 2 by kink ring 6 again, several parts 5 (screw bolt and nut) that apply the flange pretightening force by circumferential setting pass being fastenedly connected of kink ring 6 and the upper flange 1 upper lower flange of realization simultaneously.The material of upper flange is 5A06, and the upper flange end surface thickness is 16mm; The material of lower flange is 1Cr18Ni9Ti, and the lower flange end surface thickness is 8mm.
Offering annular groove with the lower flange 2 top outer side surfaces of upper flange 1 contact, be the seal groove 4 of assembling rubber seal, the width of seal groove 4 is 1.8mm, and groove depth is 4mm.At the seal groove 4 interior fluoroether rubber O-ring seals of placing Ф 3 of assembling rubber seal, the decrement of this rubber seal is 40%.
On lower flange 2 end faces of upper flange 1 contact, also offering annular groove, for the assembling pad rise as high as the banks 3, groove width is 2mm, groove depth is 1mm.At the pad that the 3 interior placements of rising as high as the banks of assembling teflon gasket match with its shape, the height 2.0mm of this pad, width are 1mm.The volume fill factor of teflon gasket in rising as high as the banks is 100%.
Above-mentioned as follows for the flange flat-groove double-channel sealing structure assembly process under the complex working conditions: as teflon gasket to be installed on to rise as high as the banks 3, the fluoroether rubber O-ring seals is installed in the seal groove 4, place the kink ring at the lower flange place, then adopt torque spanner, each bolt is tightened symmetrically, bolt tightening moment is added to 20N.m minutes for 4～5 times, then, along the circumferential direction calibrates moment twice.Adopt feeler gauge, recording maximal clearance, the lower flange outside is 0.2mm.
The double-channel sealing structure of rising as high as the banks for above-mentioned assembling, carried out respectively-60 ℃ of leakage tests, the leakage test under (contact the is 0.4MPa) condition that contacts 150 hours at 40 ℃ with the dinitrogen tetroxide gas phase media, with normal temperature after the dinitrogen tetroxide gas phase media contacts, low temperature-20 ℃ and high temperature 360 ℃ of (test periods 10 minutes, test pressure 0.9MPa) leakage test, test result shows: all do not leak in above-mentioned process of the test.After test tool was cooled to normal temperature, through overhaul, cracked and reach 2.55mm in test flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 1.52mm, does not have fifth wheel in the cavity of test tool.
Embodiment 5
As shown in Figure 2, a kind of for the flange flat-groove double-channel sealing structure under the complex working conditions, wherein lower flange 2 embeds in the upper flange 1, block lower flange 2 by kink ring 6 again, several parts 5 (screw bolt and nut) that apply the flange pretightening force by circumferential setting pass being fastenedly connected of kink ring 6 and the upper flange 1 upper lower flange of realization simultaneously.The material of upper flange is 2A14, and the upper flange end surface thickness is 16.5mm; The material of lower flange is 1Cr18Ni9Ti, and the lower flange end surface thickness is 8mm.
Offering annular groove with the lower flange 2 top outer side surfaces of upper flange 1 contact, be the seal groove 4 of assembling rubber seal, the width of seal groove 4 is 2mm, and groove depth is 4mm.At the seal groove 4 interior ethylene propylene rubber O-ring seals of placing Ф 3 of assembling rubber seal, the decrement of this rubber seal is 33.3%.
On lower flange 2 end faces of upper flange 1 contact, also offering annular groove, for the assembling pad rise as high as the banks 3, groove width is 2mm, groove depth is 1mm.At the pad that the 3 interior placements of rising as high as the banks of assembling teflon gasket match with its shape, the height 1.8mm of this pad, width are 1mm, and the volume fill factor of teflon gasket in rising as high as the banks is 90%.
Above-mentioned as follows for the flange flat-groove double-channel sealing structure assembly process under the complex working conditions: as teflon gasket to be installed on to rise as high as the banks 3, the ethylene propylene rubber O-ring seals is installed in the seal groove 4, place the kink ring at the lower flange place, then adopt torque spanner, each bolt is tightened symmetrically, bolt tightening moment is added to 20N.m minutes for 4～5 times, then, along the circumferential direction calibrates moment twice.Adopt feeler gauge, recording maximal clearance, the lower flange outside is 0.2mm.
The double-channel sealing structure of rising as high as the banks for above-mentioned assembling, carried out respectively-60 ℃ of leakage tests, the leakage test under (contact the is 0.5MPa) condition that contacts 150 hours at 40 ℃ with the uns-dimethylhydrazine gas phase media, with normal temperature after the uns-dimethylhydrazine gas phase media contacts, low temperature-20 ℃ and high temperature 345 ℃ of (test periods 10 minutes, test pressure 0.85MPa) leakage test, test result shows: all do not leak in above-mentioned process of the test.After test tool was cooled to normal temperature, through overhaul, cracked and reach 2.2mm in test flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 1.25mm, does not have fifth wheel in the cavity of test tool.
Embodiment 6
As shown in Figure 3, a kind of for the flange flat-groove double-channel sealing structure under the complex working conditions, wherein upper flange 1 and lower flange 2 docking, the external diameter of lower flange 2 is less than the external diameter of upper flange 1, block lower flange 2 by kink ring 6 again, several parts 5 (screw bolt and nut) that apply the flange pretightening force by circumferential setting pass being fastenedly connected of kink ring 6, upper flange 1 and the lower flange 2 upper lower flanges of realization simultaneously.The material of upper flange is 5A06, and the upper flange end surface thickness is 10mm; The material of lower flange is 1Cr18Ni9Ti, and the lower flange end surface thickness is 8mm.
Offer the twice annular groove at lower flange 2 end faces that contact with upper flange 1;
One annular groove in the outside is the seal groove 4 of assembling rubber seal, and the width of seal groove 4 is 4mm, and groove depth is 2.25mm.One inboard annular groove rises as high as the banks 3 for the assembling teflon gasket, and 3 the groove width of rising as high as the banks is 2mm, and groove depth is 1mm.
At the seal groove 4 interior fluoroether rubber O-ring seals of placing Ф 3 of assembling rubber seal, the decrement of this rubber seal is 25%.
At the pad that the 3 interior placements of rising as high as the banks of assembling teflon gasket match with its shape, the height 2mm of this pad, width 1mm.And the volume fill factor of teflon gasket in rising as high as the banks is 100%.
Above-mentioned as follows for the flange flat-groove double-channel sealing structure assembly process under the complex working conditions: as teflon gasket to be installed on to rise as high as the banks 3, the fluoroether rubber O-ring seals is installed in the seal groove 4, place the kink ring at the lower flange place, then adopt torque spanner, each bolt is tightened symmetrically, bolt tightening moment is added to 20N.m minutes for 4～5 times, then, along the circumferential direction calibrates moment twice.Adopt feeler gauge, recording maximal clearance, the lower flange outside is 0.2mm.
The double-channel sealing structure of rising as high as the banks for above-mentioned assembling, carried out respectively-60 ℃ of leakage tests, the leakage test under (contact the is 0.4MPa) condition that contacts 150 hours at 40 ℃ with the dinitrogen tetroxide gas phase media, with normal temperature after the dinitrogen tetroxide gas phase media contacts, low temperature-20 ℃ and high temperature 360 ℃ of (test periods 10 minutes, test pressure 0.9MPa) leakage test, test result shows: all do not leak in above-mentioned process of the test.After test tool was cooled to normal temperature, through overhaul, cracked and reach 2.25mm in test flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 1.28mm, does not have fifth wheel in the cavity of test tool.
As a comparison, for the single track sealing structure (other condition is same as above) that does not comprise that the assembling teflon gasket is risen as high as the banks, carried out respectively corresponding test, test result shows :-60 ℃ of leakage test processes are leaked, normal temperature, low temperature seal process of the test behind medium contact process and the medium contact are not leaked, 360 ℃ of leakage test processes of high temperature are leaked.After test tool was cooled to normal temperature, through overhaul, cracked and reach 2.25mm in test flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 1.25mm, and the fluoroether rubber Sealing is extruded into test tool cavity inward flange.
Embodiment 7
As shown in Figure 3, a kind of for the flange flat-groove double-channel sealing structure under the complex working conditions, wherein upper flange 1 and lower flange 2 docking, the external diameter of lower flange 2 is less than the external diameter of upper flange 1, block lower flange 2 by kink ring 6 again, several parts 5 (screw bolt and nut) that apply the flange pretightening force by circumferential setting pass being fastenedly connected of kink ring 6, upper flange 1 and the lower flange 2 upper lower flanges of realization simultaneously.The material of upper flange is 2A14, and the upper flange end surface thickness is 10mm; The material of lower flange is 1Cr18Ni9Ti, and the lower flange end surface thickness is 8mm.
Offer the twice annular groove at lower flange 2 end faces that contact with upper flange 1;
One annular groove in the outside is the seal groove 4 of assembling rubber seal, and the width of seal groove 4 is 4mm, and groove depth is 1.8mm.One inboard annular groove rises as high as the banks 3 for the assembling teflon gasket, and 3 the groove width of rising as high as the banks is 2mm, and groove depth is 1mm.
At the seal groove 4 interior ethylene propylene rubber O-ring seals of placing Ф 3 of assembling rubber seal, the decrement of this rubber seal is 40%.
At the pad that the 3 interior placements of rising as high as the banks of assembling teflon gasket match with its shape, the height 1.5mm of this pad, width 1mm.And the volume fill factor of teflon gasket in rising as high as the banks is 75%.
Above-mentioned as follows for the flange flat-groove double-channel sealing structure assembly process under the complex working conditions: as teflon gasket to be installed on to rise as high as the banks 3, the ethylene propylene rubber O-ring seals is installed in the seal groove 4, place the kink ring at the lower flange place, then adopt torque spanner, each bolt is tightened symmetrically, bolt tightening moment is added to 20N.m minutes for 4～5 times, then, along the circumferential direction calibrates moment twice.Adopt feeler gauge, recording maximal clearance, the lower flange outside is 0.2mm.
The double-channel sealing structure of rising as high as the banks for above-mentioned assembling, carried out respectively-60 ℃ of leakage tests, the leakage test under (contact the is 0.5MPa) condition that contacts 150 hours at 40 ℃ with the uns-dimethylhydrazine gas phase media, with normal temperature after the uns-dimethylhydrazine gas phase media contacts, low temperature-20 ℃ and high temperature 345 ℃ of (test periods 10 minutes, test pressure 0.95MPa) leakage test, test result shows: all do not leak in above-mentioned process of the test.After test tool was cooled to normal temperature, through overhaul, cracked and reach 2.1mm in test flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 1.08m, does not have fifth wheel in the cavity of test tool.
As a comparison, for the single track sealing structure (other condition is same as above) that does not comprise that the assembling teflon gasket is risen as high as the banks, carried out respectively corresponding leakage test, test result shows :-60 ℃ of leakage test processes are leaked, normal temperature, low temperature seal process of the test behind medium contact process and the medium contact are not leaked, 345 ℃ of leakage test processes of high temperature are leaked.After test tool was cooled to normal temperature, through overhaul, cracked and reach 2.11mm in test flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 1.08mm, and the black paint-like substance is arranged in the test tool cavity.
Claims (7)
1. thin-wall flange flat-groove double-channel sealing structure that is used for complex working conditions, wherein lower flange (2) embeds in the upper flange (1), block lower flange (2) by kink ring (6) again, several parts (5) that apply the flange pretightening force by circumferential setting pass being fastenedly connected of lower flange in kink ring (6) and upper flange (1) realization simultaneously, it is characterized in that: offering annular groove with lower flange (2) the top outer side surface of upper flange (1) contact, be the seal groove (4) of assembling rubber seal; On lower flange (2) end face of upper flange (1) contact, also offer annular groove, be rise as high as the banks (3) of assembling pad; Place rubber seal in the seal groove (4) of assembling rubber seal, the decrement of this rubber seal is 25%～40%; Place the pad that matches with its shape in rise as high as the banks (3) of assembling teflon gasket, the height of this pad is greater than the depth value 0.5～1.0mm that rises as high as the banks, and the volume fill factor of teflon gasket in rising as high as the banks is 75～100%.
2. thin-wall flange flat-groove double-channel sealing structure that is used for complex working conditions, wherein lower flange (2) docks with upper flange (1), the external diameter of lower flange (2) is less than the external diameter of upper flange (1), block lower flange (2) by kink ring (6) again, several parts (5) that apply the flange pretightening force by circumferential setting pass being fastenedly connected of lower flange in kink ring (6) and upper flange (1) realization simultaneously, it is characterized in that: offer the twice annular groove at lower flange (2) end face that contacts with upper flange (1), one annular groove in the outside is the seal groove (4) of assembling rubber seal, and one inboard annular groove is rise as high as the banks (3) of assembling pad; The assembling rubber seal seal groove (4) in the placement rubber seal, this rubber seal decrement 25%～40%; Place the pad that matches with its shape in rise as high as the banks (3) of assembling teflon gasket, the height of this pad is greater than the depth value 0.5～1.0mm that rises as high as the banks, and the volume fill factor of teflon gasket in rising as high as the banks is 75～100%.
3. a kind of thin-wall flange flat-groove double-channel sealing structure for complex working conditions according to claim 1 and 2 is characterized in that: described interior rubber seal material selection fluorine rubber or fluoroether rubber or the ethylene propylene rubber of seal groove (4) that is placed on the assembling rubber seal.
4. a kind of thin-wall flange flat-groove double-channel sealing structure for complex working conditions according to claim 1 and 2, it is characterized in that: the described parts (5) that apply the flange pretightening force are screw bolt and nut.
5. a claim 1 or 2 described any one are used for application of the thin-wall flange flat-groove double-channel sealing structure of complex working conditions, it is characterized in that: this flange flat-groove double-channel sealing structure is applied to-60 ℃ of wide temperature ranges sealings to rubber seal limit high temperature and uses; Flange produces under the texturizing condition and rubber seal contacts with strong corrosive media afterwards and do not produce fifth wheel at its limit applied at elevated temperature in the using process.
6. the application of a kind of thin-wall flange flat-groove double-channel sealing structure for complex working conditions according to claim 5, it is characterized in that: described flange distortion comes from the distortion that produces in distortion that normal temperature assembling produces and the elevated-temperature seal using process, and the distortion that the normal temperature assembling produces makes up and down the flanged surface outside maximum of cracking reach 0.2mm; The distortion that produces in the elevated-temperature seal using process reaches 2.5mm so that crack in flange inside, and the sealing surface of placing the rubber seal place cracks and reaches 1.5mm.
7. the application of a kind of thin-wall flange flat-groove double-channel sealing structure for complex working conditions according to claim 5, it is characterized in that: described strong corrosive media is dinitrogen tetroxide gas or uns-dimethylhydrazine gas.
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| CN202302432U (en) * | 2011-09-22 | 2012-07-04 | 航天材料及工艺研究所 | Axial double-channel sealing structure for thin-wall flange flat groove for use under complex working condition |
| CN202301937U (en) * | 2011-09-22 | 2012-07-04 | 航天材料及工艺研究所 | Thin-walled flange flat groove radial dual sealing structure for complex working condition |
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| CN202301937U (en) * | 2011-09-22 | 2012-07-04 | 航天材料及工艺研究所 | Thin-walled flange flat groove radial dual sealing structure for complex working condition |
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