CN101592275A - A kind of pipeline axial force elimination type pipe fitting - Google Patents
A kind of pipeline axial force elimination type pipe fitting Download PDFInfo
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- CN101592275A CN101592275A CNA2009101406967A CN200910140696A CN101592275A CN 101592275 A CN101592275 A CN 101592275A CN A2009101406967 A CNA2009101406967 A CN A2009101406967A CN 200910140696 A CN200910140696 A CN 200910140696A CN 101592275 A CN101592275 A CN 101592275A
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- pipe
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- axial force
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Abstract
The pipeline axial force elimination type pipe fitting is the temperature difference stress that a kind of work temperature difference that both can eliminate pipeline produces, can make O-ring seal have again can strengthen the novel pipe fitting of the self-tightening sealing interface function of sealing force with the working pressure of pipeline, so can thoroughly solve the leakage problems that traditional pipe fitting occurs.It is applicable to that the pipe of various calibers and various wall thickness uses.
Description
Technical field
Patent of the present invention relates to a kind of tubing, is particularly suitable for water delivery, gas transmission and oil transport pipeline and uses.
Background technique
Medium such as tap water, coal gas mainly arrives the user by line transportation, and pipe will could be installed the municipal administration road by connecting, the safe mass of the reliability decision pipeline that pipe connects.
The connection pipe fitting of known metallic conduit has threaded coupling connection (see figure 2) to be connected (see figure 3) with clamp-press type.It is to adopt the pressure-tight connection of screw thread that threaded coupling connects, though can dismantle, but tube wall total thickness 13 will increase the thickness of screw cutting groove depth 12, the waste that not only causes tubing that differs of tube wall total thickness 13 and tube wall effective thickness 11, and when the pipeline work temperature difference is big, also can cause interface seepage to be taken place by La Song.It mainly is to be applied in thin wall metal pipeline that clamp-press type connects, it utilizes pipe fitting 15 chucking pipes 16, rely on the frictional force between them to prevent pulling of pipe, so its anti-slip power is very low, its O-ring seal 14 is all to bear very big pretightening force by whole circumference to come sealed interface simultaneously, and its cushion rubber can follow the string because of excessive compressing accelerated ageing, occur seepage easily, these all are the reasons that seepage often takes place traditional pipe fitting.
Simultaneously, these Placements are when the work temperature difference of pipeline is big, and its drawback is bigger.For example internal diameter is that 19.6mm, effective thickness are the stainless steel pipeline of 1.2mm, and when the work temperature difference reached 25 ℃, the axial tensile force of generation reached 6.99kN (F=± α Eg Δ tA=± 1.73 * 10
5* 2.06 * 10
5N/mm
2* 25 ℃ * (19.6mm+1.2mm) * π * 1.2mm=6.99kN), and the tensile force that clamp-press type pipe can bear pipeline according to NBS has only 3.2kN, is lower than the working condition requirement of pipeline.For the pipeline that threaded coupling connects, because the pipe shaft wall thickness equals the degree of depth that effective thickness adds thread groove, then by last example, the total thickness of its pipe shaft is 2.5mm, and then pipeline reaches 15.5kN (F=± 1.73 * 10 at the axial tensile force that 25 ℃ of work temperature difference produce
5* 2.06 * 10
5N/mm
2* 25 ℃ * (19.6mm+2.5mm) * π * 2.5mm=15.5kN), at this moment can not eliminate temperature difference stress by axial displacement as pipeline, then the groove bottom of the threaded coupling tensile stress of bearing reaches 198MPa (δ
t=F ÷ A=15.5kN ÷ (19.6mm+1.2mm) * π * 1.2mm=198MPa),, therefore can cause thread groove to be stretched to be out of shape and make threaded coupling leakage problems occur above the permissible tensile stress of metallic material.
Therefore, the axial tensile stress of the work temperature difference generation of elimination pipeline is the key that improves the pipe safety quality.
Summary of the invention
The purpose of this invention is to provide a kind of axial tensile stress that the pipeline work temperature difference produces, novel connection pipe fitting that has good seal performance again both can eliminated.
Pipeline axial force elimination type pipe fitting of the present invention mainly is made up of pipe 1, pipe evagination annulus 2, pipe indent annulus 3, rope head 4, pipe fitting housing 5, pipe fitting threaded coupling 6, rope end surface 7, housing inclined-plane 8, O type O-ring seal 9, housing endoporus 10.
Catenation principle of the present invention is to utilize rope head 4 to screw in pipe fitting threaded coupling 6, make pipe 1 enter in the pipe fitting housing 5, at this moment the O type O-ring seal 9 that is installed in pipe indent annulus 3 is under the effect on housing inclined-plane 8, slip into housing endoporus 10, make the line footpath radial compression of O type O-ring seal 9 compare, thereby realize being tightly connected of pipe fitting interface greater than 15%.At this moment because the evagination annulus 2 of pipe has the axial displacement clearance greater than 1.8mm between rope end surface 7 and housing inclined-plane 8, so pipe can be eliminated the temperature stress that the pipeline work temperature difference produces by the axial displacement in pipe fitting.Simultaneously, the O-ring seal of this pipe fitting is owing to be to enter the pipe fitting endoporus by slipping into of inclined-plane, insert the situation that cushion rubber causes the undercut of cushion rubber to damage so solved clamp-press type pipe connection meeting again because of pipe, and because after O type O-ring seal enters the housing endoporus, some axial gaps are arranged in the indent annulus of pipe, make cushion rubber when pipeline is worked, the axial end of cushion rubber can directly bear the pressure of liquid, thereby the power that radially swells that makes cushion rubber increases with the pressure of fed sheet of a media, order seals that more science is reliable, solve the conventional seals cushion rubber and be and relied on when installing the pressure that the cushion rubber whole circumference is applied pretension to seal, when the pressure medium of line transportation greater than this pretightening force or cushion rubber is aging when following the string, leakage problems will take place.
Therefore, the present invention has not only created the novel connection pipe fitting that can eliminate pipeline work temperature difference stress, and created the novel pipe fitting structure that not damaged is installed the O-ring seal pipe fitting again, also created the self-tightening sealing interface function of the novelty that the sealing force of O-ring seal can increase with the pressure of line transportation medium.Simultaneously because the threaded coupling of this pipe fitting just restricts the axial tensile force of pipe, its screw-thread fit precision can be bigger, so when connecting thin walled tube, pipe fitting can adopt the thin walled tube manufacturing, its screw thread can adopt the technology manufacturing of roll forming screw thread, thereby the wall thickness that solves pipe fitting so not only effectively reduces the cost of pipe fitting because of the cutting forming screw thread needs the waste of increase thread groove height, pore occurs easily and leakage problems takes place but also can solve conventional cast pipe fitting technology.The pipe fitting of this novelty not only heavy wall pipe thin walled tube all is suitable for, and the caliber of all size also is suitable for, and is specially adapted to pipeline work temperature difference pipeline very big or that seepage definitely can not take place and uses.
Description of drawings
Fig. 1, pipeline axial force elimination type pipe fitting
1, pipe; 2, pipe evagination annulus; 3, pipe fitting indent annulus; 4, rope head; 5, pipe fitting housing; 6, pipe fitting threaded coupling; 7, rope end surface; 8, housing inclined-plane; 9, O type O-ring seal; 10, housing endoporus
Fig. 2, threaded coupling connect
11, pipe effective thickness; 12, the thread groove degree of depth; 13, tube wall total thickness
Fig. 3, clamp-press type pipe connect
14 O-ring seals; 15, pipe fitting; 16, pipe;
Embodiment
After rope head 4 is inserted in pipe 1 to be connected, adopt special-purpose rolling tools that the end of pipe 1 to be connected is rolled into respectively to having pipe evagination annulus 2 and pipe indent annulus 3, and O type O-ring seal 9 is inserted in the pipe indent annulus 3, again pipe fitting housing 5 is inserted in pipe 1, at this moment O type O-ring seal 9 is higher than the compression that the interior bore portion of body can pass through housing inclined-plane 8, slip into housing endoporus 10 smoothly, again rope head 4 is screwed in pipe fitting threaded coupling 6, make pipe evagination annulus 2 also have axial clearance between rope end surface 7 and the housing inclined-plane 8 (when the pipeline work temperature difference during greater than 25 ℃ greater than 1.2mm, should strengthen clearance distance), finish the pipeline of installation like this and not only can eliminate the temperature difference stress that the pipeline work temperature difference produces, and its O-ring seal also has the function of self-tightening sealing interface by the axial displacement of pipe in pipe fitting.Therefore use the seepy question that this pipe fitting can thoroughly solve traditional pipe fitting.
Above pipeline axial force elimination type pipe fitting can be pipe fittings such as butt joint, threeway, elbow and plug.Connect the very little pipeline of a few thing temperature difference, can make the evagination annulus 2 of rope end surface 7 and housing inclined-plane 8 clamping tubes, make pipeline achieve a fixed connection by screwing rope head 4.Simultaneously because the pipe of this connection also has dismountable advantage, so use very convenient.
Claims (7)
1, a kind of pipeline axial force elimination type pipe fitting is made up of pipe, pipe evagination annulus, pipe indent annulus, rope head, pipe fitting housing, pipe fitting threaded coupling, rope end surface, housing inclined-plane, O type O-ring seal, housing endoporus, it is characterized in that pipe evagination annulus places between rope end surface and the housing inclined-plane, pipe indent annulus places the housing endoporus.
2, a kind of pipeline axial force elimination type pipe fitting according to claim 1 is characterized in that when connecting, the evagination annulus of pipe has the axial displacement greater than 1.8mm between rope end surface and housing inclined-plane when pipe activity (eliminating axle power formula).
3, a kind of pipeline axial force elimination type pipe fitting according to claim 1 is characterized in that when pipe is fixedly connected, and the evagination annulus of pipe is clamped by rope end surface and housing inclined-plane.
4, a kind of pipeline axial force elimination type pipe fitting according to claim 1 is characterized in that an O type O-ring seal is arranged on pipe indent annulus.
5, a kind of pipeline axial force elimination type pipe fitting according to claim 4, the line footpath radial compression that it is characterized in that O type O-ring seal is than being to form from the housing inclined-plane slips into the process of housing endoporus, its cushion rubber line footpath radial compression ratio is greater than 15%, after O type O-ring seal enters the housing endoporus, the gap that also has some axial play in the indent annulus of pipe, the radially power of swelling in the line footpath of O type O-ring seal can increase along with the pressure of line transportation medium and increase.
6, a kind of pipeline axial force elimination type pipe fitting according to claim 1 is characterized in that detachable.
7, a kind of pipeline axial force elimination type pipe fitting according to claim 1 is characterized in that the pipe fitting with threaded coupling can adopt the thin walled tube manufacturing when being applied in when thin walled tube connects, and its screw thread is to adopt the method for rolling and molding manufacturing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101406967A CN101592275A (en) | 2008-11-25 | 2009-06-09 | A kind of pipeline axial force elimination type pipe fitting |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810219392.5 | 2008-11-25 | ||
| CNA2008102193925A CN101418895A (en) | 2008-11-25 | 2008-11-25 | Fitting for eliminating shaft force of pipe |
| CNA2009101406967A CN101592275A (en) | 2008-11-25 | 2009-06-09 | A kind of pipeline axial force elimination type pipe fitting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101592275A true CN101592275A (en) | 2009-12-02 |
Family
ID=40629824
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102193925A Pending CN101418895A (en) | 2008-11-25 | 2008-11-25 | Fitting for eliminating shaft force of pipe |
| CNA2009101406967A Pending CN101592275A (en) | 2008-11-25 | 2009-06-09 | A kind of pipeline axial force elimination type pipe fitting |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102193925A Pending CN101418895A (en) | 2008-11-25 | 2008-11-25 | Fitting for eliminating shaft force of pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN101418895A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104712865A (en) * | 2015-03-30 | 2015-06-17 | 邝月好 | Expansion compensation connecting pipe fitting |
| CN114294497A (en) * | 2021-12-31 | 2022-04-08 | 福建侨龙应急装备股份有限公司 | Telescopic pipe and emergency drainage vehicle |
-
2008
- 2008-11-25 CN CNA2008102193925A patent/CN101418895A/en active Pending
-
2009
- 2009-06-09 CN CNA2009101406967A patent/CN101592275A/en active Pending
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| Publication number | Publication date |
|---|---|
| CN101418895A (en) | 2009-04-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGZHOU LIFENG PIPELINE TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: CHENG YUTING Effective date: 20100907 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 510370 603, NO.216, HUADI AVENUE, FANGCUN VILLAGE, GUANGZHOU CITY, GUANGDONG PROVINCE TO: 511442 NO.28, NANYUAN ROAD, KENGTOU VILLAGE, NANCUN TOWN, FANYU DISTRICT, GUANGZHOU CITY, GUANGDONG PROVINCE |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20100907 Address after: 511442 Guangdong Province, Guangzhou City Southern towns Panyu District pit village south road No. 28 Applicant after: Guangzhou Lifeng Pipe Technology Co., Ltd. Address before: 510370 No. 216, flower garden avenue, Guangzhou, Guangdong, Fangcun 603 Applicant before: Cheng Yuting |
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20091202 |