CN101440901A - Pipe junction cutting sleeve suitable for high temperature condition - Google Patents
Pipe junction cutting sleeve suitable for high temperature condition Download PDFInfo
- Publication number
- CN101440901A CN101440901A CNA2008102441361A CN200810244136A CN101440901A CN 101440901 A CN101440901 A CN 101440901A CN A2008102441361 A CNA2008102441361 A CN A2008102441361A CN 200810244136 A CN200810244136 A CN 200810244136A CN 101440901 A CN101440901 A CN 101440901A
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- Prior art keywords
- graphite
- pipe fitting
- bolt
- nut
- cutting ferrule
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- 239000010439 graphite Substances 0.000 claims abstract description 65
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 62
- 239000003566 sealing material Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims description 2
- 240000003936 Plumbago auriculata Species 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 35
- 230000000694 effects Effects 0.000 abstract description 12
- 238000001125 extrusion Methods 0.000 abstract description 5
- 230000001131 transforming effect Effects 0.000 abstract 1
- 229910052572 stoneware Inorganic materials 0.000 description 21
- 239000002184 metal Substances 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 239000000919 ceramic Substances 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 238000003466 welding Methods 0.000 description 5
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 241000209456 Plumbago Species 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Ceramic Products (AREA)
Abstract
The invention relates to a pipe joint sleeve suitable for high temperature, comprising a screw cap, a screw bolt, a graphite pad as a sealing material, wherein, an inclined surface exists in the interfaces of the screw cap and graphite pad or the screw bolt and the graphite pad, thus not only prolonging the length of two sealing surfaces between the graphite pad and screw cap, and the graphite pad and work pipe fitting, but also partly transforming the extrusion pressure between the screw cap and screw bolt to the pressure from the graphite pad to the work pipe fitting so as to ensure the sealing effect and connecting strength. The sleeve is especially suitable for high-temperature seal and connection of the brittle material pipe fitting.
Description
Technical field:
The present invention relates to a kind of pipe junction cutting sleeve that is applicable under the high temperature condition, be particularly useful for being connected between ceramic pipe fitting and the metal pipe line.
Background technique:
Stupalith has excellent chemical stability and high-temperature stability, but its disadvantage is easy embrittlement.The connecting means of stoneware pipe and metal pipe line has 3 kinds usually: welding, bonding and mechanical connection.Welding process can be realized good sealing and have certain intensity, but metal and ceramic character are totally different, must adopt special welding procedure.The metal-ceramic welding process of reported in literature has a lot [Ye Dameng, Xiong Weihao, Xu Huaan. the present Research of ceramet and metal welding techniques and prospect. the material Leader, 2006,20 (8): 72～75.],, liquid phase transition synthetic as melting, soldering, pressure welding, beam of neutral atoms irradiation, self propagating high temperature etc., these methods also are in conceptual phase mostly on technology, and operation is very loaded down with trivial details.The difficulty of bonding method is to lack suitable high temperature adhesive, and this is because the physical and chemical performance and the expansion coefficient of metal and pottery have than big-difference, makes bonding strength and sealing effect be difficult to satisfy the requirement of high temperature service condition.The mechanical connection method be by joint, screw thread, flange, cutting ferrule wait the sealing that realizes stoneware pipe and with being connected of other parts, have simple, cost is low, the advantage of easy accessibility, but pottery belongs to brittle material, even at normal temperatures, the also necessary significant care of joint design and operating process, difficulty is bigger under high temperature condition, and sealing effect also more be cannot say for sure to demonstrate,prove.
Graphite is very desirable high-temperature sealing material.With graphite pads stoneware pipe being carried out the end face extruding is a kind of modal elevated-temperature seal mode [Y.Huang, R.Dittmeyer.J.Membr.Sci., 2006,282 (1-2): 296-310] [Hong Xuelun, Wu Diyong, Fu Guizhi, Qiu Guowen, Liu Chaopu. a kind of inorganic material and metallic seal connection part .CN 96225849.0,1996].The end face extrusion requires the end face of pipe fitting necessary smooth and vertical with body, and sealing effect then depends on the pressure size: underpressure is then poorly sealed, the excessive easy crushing stoneware pipe of pressure; In the temperature-rise period, the expanded by heating that also will consider each parts stoneware pipe of also may crushing.The end face extrusion obviously is not suitable for the ceramic pipe fitting that has than big L/D ratio.After the cooling, the sealing effect of end face extrusion descends.In addition, when the tube wall of stoneware pipe was thin, it may destroy sealing effect to the shearing force that graphite pads produces in extrusion process, still was difficult to solve root problem even employing includes metal-cored graphite pads.The sealing means of O shape circle formula is that the extrusion-deformation by O type circle realizes that sealing effect depends on the elasticity of O shape circle.Rubber o-ring non-refractory with favorable elasticity, but and resistant to elevated temperatures sealing material such as graphite lack flexibility, therefore this sealing means is also undesirable.This patent still with graphite as sealing material, sealing means is similar to O shape circle formula, but has designed a kind of connection cutting ferrule with special construction, solves these problems well.
Summary of the invention:
The objective of the invention is existing problem when adopting graphite pads to carry out elevated-temperature seal between brittle material and the metal pipe line, and proposed a kind of pipe junction cutting sleeve that is applicable to high temperature condition.
Technological scheme of the present invention is: a kind of high temperature connects cutting ferrule, it is characterized in that forming by nut (1), bolt (2) with as the graphite pads (4) of sealing material; Nut (1) and bolt (2) respectively have an inclined-plane towards graphite, and wherein nut (1) is 5-80 ° towards angle between the inclined-plane of graphite and the work pipe fitting, bolt (2) towards the inclined-plane of graphite with work that angle is 5-90 ° between the pipe fitting; The graphite length that is contacted with work pipe fitting (3) is 4-30mm.
Nut is 15-45 ° towards the inclined-plane of graphite and the angle that is between the pipe fitting of working; Bolt is 30-50 ° towards the inclined-plane of graphite with the angle that the work pipe fitting is; Two inclined-planes can be level and smooth, also can be to contain screw thread or concavo-convex curved surface.Can further increase the length of sealing surface like this.
Described work pipe fitting is brittle material pipe fitting (as a stoneware pipe, metal tube, plastic tube); Work pipe fitting external diameter is 5-100mm; Described nut and bolt external diameter are 8-120mm.
Nut (1) and nut (2) are metal material, preferred stainless steel, and the outside can screw with the spanner application of force.
Graphite pads as sealing material is the Gask-O-Seal that centers on the work pipe fitting; With mould moulding in advance, or the cavity place that graphite is directly put into nut and pipe fitting pushed then and there with bolt form.Described graphite is plumbago, graphite paper, graphite silk or graphite scrap.
As once the extruding after can be with the complete precession nut of screw thread, the bolt (2) of then outwarding winding continues to add graphite, bolt is vacated the 1-3mm screw thread behind the bolt and nut jam-packed.Owing to may contain unsettled impurity under the high temperature in the graphite, therefore graphite at high temperature should be handled in advance.
With the stoneware pipe is example, and the working principle of institute's invention cutting ferrule as shown in Figure 1.Forming the annular seal chamber of a trapezoid cross section between nut (1), bolt (2) and the stoneware pipe (3), is graphite sealing material (4) in the Seal cage.Sealing back gas may be revealed two lines: the interface of first nut (1) and graphite annulus (4), and it two is graphite annuluss (4) and the interface of stoneware pipe (2), these two interfaces promptly are sealing surfaces.Obviously, sealing material is big more with the surface of contact of nut and stoneware pipe, to contact tight more then sealing effect good more.Design proposal shown in Figure 1, the length that one side has prolonged these two sealing surfaces greatly, can realize that to the extruding of graphite annulus (4) graphite annulus contacts with the tight of the above two by nut (1) and bolt (2) simultaneously on the other hand, thereby can realize good seal action.The Seal cage of tradition cutting ferrule is the rectangular ring in cross section, and with graphite O shape circle or O shape ring as sealing gasket, cutting ferrule mainly is longitudinally to the extruding force of graphite, and the needs of the sealing between graphite pads and the stoneware pipe is lateral pressure, because graphite is not elastic material, longitudinal pressure seldom can transfer lateral force to, therefore can't realize good sealing.And the designed cutting ferrule of the present invention has utilized resolution of forces principle on the physics, has not only increased sealing surface but also realized combining closely of sealing material and sealing surface, thereby guaranteed sealing effect and join strength.
The external diameter of stoneware pipe is 5-100mm, and the internal diameter size and the stoneware pipe of bolt (2) are complementary, and stoneware pipe also may slightly be irregular cycle, and will guarantee that stoneware pipe can enter bolt smoothly this moment by the internal diameter that increases bolt (2).The height of Seal cage be graphite-filled height at 2-10mm, high more then nut of Seal cage (1) and bolt (2) need revolve tightly more sealing material is produced enough extruding forces; The long more then sealing surface of Seal cage is long more, and sealing effect is good more.Only can make cutting ferrule seem too heavy, and cutting ferrule can cover stoneware pipe more, so the optimum packed height of Seal cage is 3-6mm.Nut (1) and nut (2) are metal material, preferred stainless steel, and the outside can screw with the spanner application of force.The bottom of nut (1) can link to each other with metal pipe line, also can seal into the stoneware pipe plug.
The said stupalith of the present invention also comprises porous ceramics and is the composite material of matrix with the pottery.For example have good hydrogen performance with the porous ceramics be the palladium of matrix or palladium alloy membrane [Huang Yan, Li Xue, Fan Yiqun, Xu Nanping. the progress of hydrogen permeation palladium-based composite membrane: principle, preparation and sign. chemical progress, 2006,18 (2-3): 230-238.].
The elevated-temperature seal that the designed cutting ferrule of this patent also is applicable to metal pipe be connected.
Beneficial effect:
The pipe junction cutting sleeve of being invented has utilized resolution of forces principle on the physics dexterously, has not only increased sealing surface but also realized combining closely of sealing material and sealing surface, thereby guaranteed sealing effect and join strength.Solved the elevated-temperature seal difficult problem of brittle material.This cutting ferrule compact structure, be easy to processing, easy to use, good sealing effect.Traditional pipe junction cutting sleeve, after using once, the Sealing in the cutting ferrule will combine firmly with metal tube, metal tube can only be cut off when changing cutting ferrule.And the cutting ferrule of this patent is changed conveniently, only needs that bolt (2) is turned on the destruction graphite pads and can take off cutting ferrule.
Description of drawings:
Fig. 1. the cutting ferrule structural representation; 1-nut wherein; The 2-bolt; The 3-pipe fitting; The 4-graphite pads.
Fig. 2. the cutting ferrule structural representation; 1-nut wherein; The 2-bolt; The 3-pipe fitting; The 4-graphite pads; The 5-depression.
Specific embodiments:
Employed pipe fitting is the corundum ceramic pipe of external diameter 12mm, internal diameter 8mm, long 10cm.The two ends cutting ferrule designs as shown in Figure 1, and wherein the compressive plane angle of inclination of the sealing surface of STAINLESS STEEL NUTS and stainless steel bolt is respectively 40 and 45 °, and the graphite length that is contacted with stoneware pipe is 15mm.Sealing material is the fragment that the thick graphite paper of 0.5mm is cut into, in advance at 500 ℃ of roasting 3h.Graphite scrap is put into the Seal cage of cutting ferrule, screw bolt,, add graphite again bolt being outwarded winding after the graphite compacting.After alundum tube is sealed at both ends, end sealing, the other end links to each other with steel cylinder nitrogen by valve.Pressurization 0.4MPa in the alundum tube, throttle down is found pipe internal pressure no change in the 3min, illustrates air tight.With stoneware pipe be fastened in 450 ℃ of heating 3h, carry out air tightness test once more, find gas leakage yet.Black box through between room temperature～450 ℃ repeatedly 5 heating and cooling handle, find that tightness is without any variation.
Embodiment 2
With embodiment 1, but sealing material changes into and is plumbago, finds that tightness is good.
With embodiment 1, but pipe fitting changes the Stainless Steel Tube of external diameter 20mm, internal diameter 10mm, long 15cm into.The discovery tightness is good.
With embodiment 1, but the compressive plane angle of inclination of the sealing surface of STAINLESS STEEL NUTS and stainless steel bolt is respectively 20 and 50 °, and the graphite length that is contacted with stoneware pipe is 10mm.The discovery tightness is good.
With embodiment 1, but the cutting ferrule structure as shown in Figure 2: the sealing surface of nut (1) has increased a semicircular depression (5), has prolonged the interface between nut (1) and the graphite.
Above embodiment only is used for illustrating the present invention, and the variation of any equivalence of being done under the situation that does not break away from spirit of the present invention all belongs to the scope of claim of the present invention.
Claims (5)
1. pipe junction cutting sleeve that is applicable to high temperature condition is characterized in that forming by nut (1), bolt (2) with as the graphite pads (4) of sealing material; Nut (1) and bolt (2) respectively have an inclined-plane towards graphite, and wherein nut (1) is 5-80 ° towards angle between the inclined-plane of graphite and the work pipe fitting, bolt (2) towards the inclined-plane of graphite with work that angle is 5-90 ° between the pipe fitting; The graphite length that is contacted with work pipe fitting (3) is 4-30mm.
2. cutting ferrule as claimed in claim 1 is characterized in that nut is 15-45 ° towards the inclined-plane of graphite and the angle that is between the pipe fitting of working; Bolt is 30-50 ° towards the inclined-plane of graphite with the angle that the work pipe fitting is; Two inclined-planes are level and smooth, or contain screw thread or concavo-convex curved surface.
3. cutting ferrule as claimed in claim 1 is characterized in that described work pipe fitting is the brittle material pipe fitting; Work pipe fitting external diameter is 5-100mm; Described nut and bolt external diameter are 8-120mm.
4. cutting ferrule as claimed in claim 1 is characterized in that the graphite pads as sealing material is the Gask-O-Seal that centers on the work pipe fitting; With mould moulding in advance, or the cavity place that graphite is directly put into nut and pipe fitting pushed then and there with bolt form.
5. cutting ferrule as claimed in claim 4 is characterized in that described graphite is plumbago, graphite paper, graphite silk or graphite scrap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102441361A CN101440901B (en) | 2008-12-23 | 2008-12-23 | Pipe junction cutting sleeve suitable for high temperature condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102441361A CN101440901B (en) | 2008-12-23 | 2008-12-23 | Pipe junction cutting sleeve suitable for high temperature condition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101440901A true CN101440901A (en) | 2009-05-27 |
| CN101440901B CN101440901B (en) | 2010-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102441361A Active CN101440901B (en) | 2008-12-23 | 2008-12-23 | Pipe junction cutting sleeve suitable for high temperature condition |
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| Country | Link |
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| CN (1) | CN101440901B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979981A (en) * | 2012-11-23 | 2013-03-20 | 南京工业大学 | High temperature sealer for ceramic pipe |
| CN105424888A (en) * | 2015-12-10 | 2016-03-23 | 陆辰钊 | Testing device capable of being used for gas sensor calibration |
| CN108917508A (en) * | 2018-07-10 | 2018-11-30 | 中国人民解放军陆军工程大学 | Imderwater cutting device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB811077A (en) * | 1956-12-10 | 1959-04-02 | Tri Sil Chemicals & Equipment | Improvements in and relating to fluid tight tube couplings |
| CN2119550U (en) * | 1992-01-31 | 1992-10-21 | 中国科学院山西煤炭化学研究所 | High-temp and -pressure ball valve |
-
2008
- 2008-12-23 CN CN2008102441361A patent/CN101440901B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979981A (en) * | 2012-11-23 | 2013-03-20 | 南京工业大学 | High temperature sealer for ceramic pipe |
| CN105424888A (en) * | 2015-12-10 | 2016-03-23 | 陆辰钊 | Testing device capable of being used for gas sensor calibration |
| CN108917508A (en) * | 2018-07-10 | 2018-11-30 | 中国人民解放军陆军工程大学 | Imderwater cutting device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101440901B (en) | 2010-12-01 |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: YANGZHOU HUAYU PIPE FITTING CO., LTD. |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20110707 Address after: 210009 Zhongshan North Road, Jiangsu, No. 200, Co-patentee after: Yangzhou Huayu Tube Fittings Co., Ltd. Patentee after: Nanjing University of Technology Address before: 210009 Zhongshan North Road, Jiangsu, No. 200, Patentee before: Nanjing University of Technology |