CN103674389A - Test method of determining catheter sealing joint tightening torque - Google Patents
Test method of determining catheter sealing joint tightening torque Download PDFInfo
- Publication number
- CN103674389A CN103674389A CN201310576887.4A CN201310576887A CN103674389A CN 103674389 A CN103674389 A CN 103674389A CN 201310576887 A CN201310576887 A CN 201310576887A CN 103674389 A CN103674389 A CN 103674389A
- Authority
- CN
- China
- Prior art keywords
- screw
- torque value
- down torque
- minimum
- tightening torque
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a test method of determining a catheter sealing joint tightening torque. A minimum pre-tightening force and a maximum pre-tightening force are used to calculate a theoretical minimum tightening torque value and a theoretical maximum tightening torque value of the catheter sealing joint; while the theoretical minimum tightening torque value serves as a starting point, a tightening torque value gradually increases at a certain interval, and an air tightness test of the catheter sealing joint is carried out at each tightening torque value, so that a test minimum tightening torque value meeting a leakage ratio is obtained; the test minimum tightening torque value meeting the leakage ratio is multiplied by a torque attenuation coefficient so as to obtain a final tightening torque value; and based on the tightening torque which is obtained when the final tightening torque value is multiplied by 1.25, the catheter sealing joint is tightened, and a thread strength is determined whether thread strength meets requirements. If the thread strength does not meet the requirements, the catheter sealing joint structure is re-designed, and the final tightening torque value is determined; and if the thread strength meets the requirements, then the test comes to an end.
Description
Technical field
The present invention relates to a kind of test method of definite conduit sealing adaptor screw-down torque.
Background technology
As shown in Figure 1, the step conduit sealing adaptor that certain carrier rocket newly grinds comprises concave station rank joint 1, boss rank joint 2, metallic gasket 3 and cap nut 4, its sealing principle is to rely on the pressure producing that is threaded to make metallic gasket generation yield deformation, realize the filling in microcosmic gap between joint face, thereby guarantee sealing.By special-purpose tightening tool (being torque spanner) fastening nut, in rundown process, can show in real time screw-down torque value.For this kind of conduit sealing adaptor, according to leak rate, require as not higher than 1 * 10
-5pa.m
3the condition of/s, has carried out the research work that moment quantizes, and has formed a set of test method of rationally determining conduit sealing adaptor screw-down torque.
Summary of the invention
The object of the present invention is to provide a kind of test method of definite conduit sealing adaptor screw-down torque, to meet the request for utilization relying under the various operating modes of conduit sealing adaptor that are threaded, particularly in seal request high field, close.
The present invention includes following technical scheme:
A test method for definite conduit sealing adaptor screw-down torque, described conduit sealing adaptor comprises metallic gasket and nut, comprises the steps:
(1) according to minimum pretightning force and maximum pretightning force, calculate the minimum screw-down torque value of theory and the theoretical maximum screw-down torque value of conduit sealing adaptor;
(2) using the minimum screw-down torque value of described theory as starting point, with certain interval, increase gradually screw-down torque value, under each screw-down torque value, described conduit sealing adaptor is carried out to airtight detection, draw the minimum screw-down torque value of test that meets leak rate requirement;
(3) the described minimum moment values of test that meets leak rate requirement is multiplied by moment attenuation coefficient and draws final screw-down torque value;
(4) moment that final screw-down torque is multiplied by 1.25 acquisitions is tightened described conduit sealing adaptor, determines whether screw strength meets the demands;
If screw strength does not meet the demands, need design again conduit seal joint structure, and return to step (1);
If screw strength meets the demands, finish.
Described minimum pretightning force is determined by the seal pressure of metallic gasket.
Described moment attenuation coefficient is 1.25～1.3.
The present invention compared with prior art tool has the following advantages:
In test method of the present invention using the minimum screw-down torque value of theory as starting point, with certain interval, increase gradually screw-down torque value, under each screw-down torque value, described conduit sealing adaptor is carried out to airtight detection, draw the minimum screw-down torque value of test that meets leak rate requirement; The described minimum moment values of test that meets leak rate requirement is multiplied by moment attenuation coefficient and draws final screw-down torque value.The determined final screw-down torque value of the present invention can realize joint leak rate lower than 10
-7pa.m
3the use of/s magnitude, far above its designing requirement, has certain reliability.
Accompanying drawing explanation
Fig. 1 is the structural representation of conduit sealing adaptor;
Fig. 2 is for determining the process flow diagram of the test method of conduit sealing adaptor screw-down torque.
Embodiment
Below just by reference to the accompanying drawings the present invention is described further.
As shown in Figure 1, the steps type seal joint sealing by the realization of compressed metal packing ring of take is example, determines that the test method step of screw-down torque is as follows:
1,, according to the relational expression of pretightning force and screw-down torque, be met the minimum screw-down torque value of theory and the maximum screw-down torque value of sealing.
The relational expression of pretightning force and screw-down torque is as follows:
Wherein minimum pretightning force is determined (the minimum seal pressure that is metallic gasket is multiplied by compression area) by the seal pressure of metallic gasket, and maximum pretightning force is determined according to the yield stress of thread material.The yield stress of described thread material comprises screw thread shear stress τ, bending stress σ
w.According to screw thread shear stress τ, bending stress σ
wbe respectively with the relational expression of pretightning force:
with
determine respectively pretightning force corresponding to shear stress, the pretightning force that bending stress is corresponding, using a pretightning force minimum in these two pretightning forces as described maximum pretightning force.Wherein, Q: pretightning force, N; F
j: single pitch thread shear(ing) area, F
j=0.875 π dP, mm
2; X
l: the screw thread arm of force, X
l=0.325P, mm; W: single pitch thread section factor, W=0.128 π dP
2, mm
3; N: thread turns; D: screw thread nominal diameter, mm; P: pitch, mm.
2, by test, determine the minimum screw-down torque value M of test
0, the minimum screw-down torque of theory of take is tightened joint as starting point, carries out the airtight detection of normal temperature, if leak rate does not meet the demands, with certain moment interval, loads step by step, until leak rate meets the demands, corresponding moment values is M
0.Notice that moment loading should not exceed theoretical maximum screw-down torque value.Moment interval generally rule of thumb determines, as latus rectum specification be 4mm pipe joint element, the desirable 3N.m in moment interval.The airtight test example of normal temperature is as used helium Mass Spectrometer Method method.
3, the minimum screw-down torque value M determining in test
0on basis, be multiplied by moment attenuation coefficient, obtain final screw-down torque value M.Described moment attenuation coefficient is 1.25～1.3.
4, with 1.25 times of final screw-down torque value M, examine screw strength;
If screw strength does not meet the demands (occurring thread biting locking or screw thread damage), need conduit seal joint structure to design again (such as changing thread material coupling etc.), and redefine final screw-down torque value according to above-mentioned steps, if screw strength meets the demands (not occurring thread biting locking or screw thread damage), finish.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (3)
1. a test method for definite conduit sealing adaptor screw-down torque, described conduit sealing adaptor comprises metallic gasket and nut, it is characterized in that, described test method comprises the steps:
(1) according to minimum pretightning force and maximum pretightning force, calculate the minimum screw-down torque value of theory and the theoretical maximum screw-down torque value of conduit sealing adaptor;
(2) using the minimum screw-down torque value of described theory as starting point, with certain interval, increase gradually screw-down torque value, under each screw-down torque value, described conduit sealing adaptor is carried out to airtight detection, draw the minimum screw-down torque value of test that meets leak rate requirement;
(3) the described minimum moment values of test that meets leak rate requirement is multiplied by moment attenuation coefficient and draws final screw-down torque value;
(4) moment that final screw-down torque is multiplied by 1.25 acquisitions is tightened described conduit sealing adaptor, determines whether screw strength meets the demands;
If screw strength does not meet the demands, need design again conduit seal joint structure, and return to step (1);
If screw strength meets the demands, finish.
2. the method for claim 1, is characterized in that: described minimum pretightning force is determined by the seal pressure of metallic gasket.
3. the method for claim 1, is characterized in that: described moment attenuation coefficient is 1.25～1.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310576887.4A CN103674389B (en) | 2013-11-18 | 2013-11-18 | Test method of determining catheter sealing joint tightening torque |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310576887.4A CN103674389B (en) | 2013-11-18 | 2013-11-18 | Test method of determining catheter sealing joint tightening torque |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103674389A true CN103674389A (en) | 2014-03-26 |
| CN103674389B CN103674389B (en) | 2015-07-15 |
Family
ID=50312629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310576887.4A Active CN103674389B (en) | 2013-11-18 | 2013-11-18 | Test method of determining catheter sealing joint tightening torque |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103674389B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215381A (en) * | 2014-07-28 | 2014-12-17 | 北京强度环境研究所 | Method for calibrating mounting tightening torque of missile limiting strap |
| CN104215381B (en) * | 2014-07-28 | 2017-01-04 | 北京强度环境研究所 | Screw-down torque scaling method installed by the spacing band of body |
| CN106404245A (en) * | 2016-08-24 | 2017-02-15 | 北京星航机电装备有限公司 | Method for determining installation torque of sleeve nut of flared combined conduit |
| CN106931931A (en) * | 2017-03-29 | 2017-07-07 | 王洸泽 | A kind of fire-fighting flexibility plough groove type pipe joint deflection angle automatic testing equipment |
| CN106950109A (en) * | 2017-04-01 | 2017-07-14 | 山东省产品质量检验研究院 | A kind of fire-fighting carries torque automatic test equipment with plough groove type pipe joint |
| CN107538211A (en) * | 2017-09-30 | 2018-01-05 | 安徽江淮汽车集团股份有限公司 | A kind of determination method of the urgent torque of suspension system attachment bolt |
| CN109397170A (en) * | 2018-11-23 | 2019-03-01 | 中国航发北京航科发动机控制系统科技有限公司 | A kind of verification method of the effective screw-down torque of locking nut |
| CN111062101A (en) * | 2019-12-18 | 2020-04-24 | 西安航天动力研究所 | Method for determining tightening torque of threaded connection of pipeline |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0354430A (en) * | 1989-07-24 | 1991-03-08 | Kawasaki Steel Corp | Method for tightening coupling of oil well pipe and method for judging abnormality in tightening |
| US20030098585A1 (en) * | 2000-05-10 | 2003-05-29 | Takuya Tsujimura | Tightening method for a pipe joint |
| CN201876333U (en) * | 2010-12-02 | 2011-06-22 | 核动力运行研究所 | Torque testing device of valve electric actuating mechanism |
| CN102519652A (en) * | 2011-12-16 | 2012-06-27 | 天津大学 | Bolt pre-tightening force testing device and control method thereof |
| CN103149023A (en) * | 2013-03-18 | 2013-06-12 | 深圳市瑞格尔仪器有限公司 | Nut performance testing device and nut performance testing machine |
-
2013
- 2013-11-18 CN CN201310576887.4A patent/CN103674389B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0354430A (en) * | 1989-07-24 | 1991-03-08 | Kawasaki Steel Corp | Method for tightening coupling of oil well pipe and method for judging abnormality in tightening |
| US20030098585A1 (en) * | 2000-05-10 | 2003-05-29 | Takuya Tsujimura | Tightening method for a pipe joint |
| CN201876333U (en) * | 2010-12-02 | 2011-06-22 | 核动力运行研究所 | Torque testing device of valve electric actuating mechanism |
| CN102519652A (en) * | 2011-12-16 | 2012-06-27 | 天津大学 | Bolt pre-tightening force testing device and control method thereof |
| CN103149023A (en) * | 2013-03-18 | 2013-06-12 | 深圳市瑞格尔仪器有限公司 | Nut performance testing device and nut performance testing machine |
Non-Patent Citations (1)
| Title |
|---|
| 殷明霞等: "螺纹结构力矩及其衰退机理分析", 《强度与环境》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215381A (en) * | 2014-07-28 | 2014-12-17 | 北京强度环境研究所 | Method for calibrating mounting tightening torque of missile limiting strap |
| CN104215381B (en) * | 2014-07-28 | 2017-01-04 | 北京强度环境研究所 | Screw-down torque scaling method installed by the spacing band of body |
| CN106404245A (en) * | 2016-08-24 | 2017-02-15 | 北京星航机电装备有限公司 | Method for determining installation torque of sleeve nut of flared combined conduit |
| CN106404245B (en) * | 2016-08-24 | 2019-04-16 | 北京星航机电装备有限公司 | A kind of flared type combined catheter cap nut mounting torque determines method |
| CN106931931A (en) * | 2017-03-29 | 2017-07-07 | 王洸泽 | A kind of fire-fighting flexibility plough groove type pipe joint deflection angle automatic testing equipment |
| CN106950109A (en) * | 2017-04-01 | 2017-07-14 | 山东省产品质量检验研究院 | A kind of fire-fighting carries torque automatic test equipment with plough groove type pipe joint |
| CN106950109B (en) * | 2017-04-01 | 2023-08-08 | 山东省产品质量检验研究院 | Automatic test device for bearing moment of groove type pipe joint for fire control |
| CN107538211A (en) * | 2017-09-30 | 2018-01-05 | 安徽江淮汽车集团股份有限公司 | A kind of determination method of the urgent torque of suspension system attachment bolt |
| CN107538211B (en) * | 2017-09-30 | 2019-02-19 | 安徽江淮汽车集团股份有限公司 | A kind of determination method of the urgent torque of suspension system attachment bolt |
| CN109397170A (en) * | 2018-11-23 | 2019-03-01 | 中国航发北京航科发动机控制系统科技有限公司 | A kind of verification method of the effective screw-down torque of locking nut |
| CN109397170B (en) * | 2018-11-23 | 2020-11-13 | 中国航发北京航科发动机控制系统科技有限公司 | Method for verifying effective tightening torque of lock nut |
| CN111062101A (en) * | 2019-12-18 | 2020-04-24 | 西安航天动力研究所 | Method for determining tightening torque of threaded connection of pipeline |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103674389B (en) | 2015-07-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103674389B (en) | Test method of determining catheter sealing joint tightening torque | |
| US3139294A (en) | Flared tube fitting | |
| EP3708892B1 (en) | Threaded connection for steel pipe | |
| CN204785169U (en) | Pipeline connecting structure | |
| CN203585616U (en) | Son and mother sealing ring for connecting smooth metal pipes | |
| CN111062101B (en) | Method for determining tightening torque of threaded connection of pipeline | |
| RU160886U1 (en) | HIGH-SEALED THREADED JOINT OF ELECTRIC WELDED CASING OIL PIPES | |
| CN108050256B (en) | Large-clearance compensation type sealing device for high-temperature and high-pressure kettle | |
| CN110985783B (en) | Flexible graphite metal corrugated tooth composite gasket sealing structure | |
| CN105134673B (en) | The super-pressure conical surface is sealed from pretension accumulator firmly | |
| CN204942223U (en) | A kind of harmless adaptivity fastener assembly | |
| JPWO2018163829A1 (en) | Oil Well Pipe Threaded Fittings | |
| CN112628519B (en) | High-pressure self-tightening type pipeline plug and application thereof | |
| CN106404245B (en) | A kind of flared type combined catheter cap nut mounting torque determines method | |
| CN206504033U (en) | A kind of brake piping assembly and vehicle | |
| EP3387311B1 (en) | A tube-to-tube connection device and method of same | |
| CN203035112U (en) | Novel structural oil pipeline for oil and gas well | |
| CN205824430U (en) | A kind of vacuum pipe retractor device of adjustable sealing specific pressure | |
| CN206820446U (en) | A kind of X-ray machine X cable joint protector | |
| CN214579456U (en) | Pipeline sealing structure suitable for less oil equipment | |
| CN211667299U (en) | Connecting device of compressed air pulse valve and dust remover box | |
| CN202901598U (en) | Hydraulic pneumatic pipe connector | |
| CN103775760A (en) | Direct-type connecting piece for hydro-pneumatic pipes | |
| CN210317640U (en) | Electric pump with improved cable sealing structure | |
| CN210375510U (en) | Pressure gauge joint |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |