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Abstract: PE-steel gas valve is an important connecting device for urban gas pipeline network. The structural form of the end connection of PE gas valve is especially important. The finite element software was used to analyze the influence of the PE end joint structure on the seal, and the analysis data was compared with the actual one. The research results show that the theoretical analysis and experimental results are in good agreement, and the reasonable structural form design can effectively avoid the uncertain factors, and its sealing performance is more stable and reliable.
Key words: PE-steel gas valve finite element analysis structure optimization annular double-sided helical tooth groove 1 Overview With the rapid development of gas pipelines, PE materials are commonly used as gas materials, and PE-steel gas valves are important as urban gas pipeline network systems. Equipment, its application is very extensive, so considering the safety of gas pipeline network operation equipment, is the main factor considered by the valve manufacturer. However, the conventional structure generally adopts the PE tube sleeved on the outer circumference of the metal steel pipe member, and a steel sealing member is sleeved on the outer circumference of the PE pipe to press and fix the plastic pipe body. The fixing method is not only the sealing property, but also the sealing method. And the stability of the connection is also general, the transmission medium is not only easy to leak during transmission. Especially in the case of buried construction of the installed pipe network system, when the tensile force and pressure change of the site are complicatedly combined, the plastic pipe body is easy to be detached from the steel pipe fitting under the force, so that the joint structure seal is invalid or even disintegrated on site.
2 Structural analysis optimization and verification The anti-leakage and leakage prevention of the PE end of the PE-steel gas valve is the key to the reliability of the valve seal. The anti-extraction structure is a connection form of PE and steel metal parts, and mainly has a tapered bevel shape, a zigzag shape, a threaded spiral tooth structure, and the like; and the sealing structure affecting the end structure has a seal structure, a material property, a welding process Parameters, etc.
Aiming at the deficiencies of the prior art, a new annular double-sided oblique tooth groove structure + double-channel sealing ring + adjustable pre-tensioning device is proposed between the pipe fitting mounting portion and the pipe body mounting portion to realize the pipe fitting and the pipe body. The reliability of the seal structure (as shown). That is, a plurality of annular double-sided helical bevels for preventing the PE pipe from being detached from the metal pipe member are disposed at the outer circumference of the metal pipe member at the end of the valve body, and the double-sided helical tooth groove is favorable for the installation of the PE pipe, and the PE pipe is prevented from being The metal pipe is separated from the metal pipe by the pulling force. A sealing ring structure is arranged on both inner and outer ends of the double-sided helical tooth groove, which can effectively compensate the gap between the PE pipe and the metal pipe member to form a double-channel seal. The external adopts the adjustable pre-tightening device sealing structure, and the PE end is firmly positioned on the metal steel pipe member, and is integrated with the metal steel pipe to form an integral type.
The structure adopts three-dimensional modeling software and finite element analysis software, and the existing commonly used structures such as inverted tooth shape, thread spiral tooth shape and ring double-sided oblique tooth shape are drawn into a three-dimensional model to define material properties, mesh, and add. Constrained load and analytical test values, etc. Under the specific conditions, simulate the results of the analysis of the applied internal pressure load, as shown in the following chart:
It is known from the above table that under certain working conditions and load conditions, when the tooth profile is a ring-shaped double-sided helical tooth, the corresponding equivalent stress and contact stress are optimal. Because the mechanical properties of PE pipe and metal steel are quite different, the theoretical analysis alone cannot be quasi-deterministic. Therefore, only the theoretical data parameters can be verified and compared with the test results. The structural members are subjected to static pressure strength test and dynamic load sealing test, and bending deformation, tensile force, pressure and torsion force in an uncertain direction are applied to check the sealing reliability of the PE end.
Through the test data, the comprehensive toughness of the annular double-sided helical tooth shape is good, and the installation is convenient during hot melt. The helical tooth structure and the adjustable pre-tensioning device mechanism can effectively ensure the connection of the PE pipe and the steel metal piece is firm, and the structure is It is beneficial to the construction operation, and will not cause the PE pipe to break or break due to the uncertainty of construction. At the same time, the ground settlement adaptability is very strong, with seismic performance and good resistance to slow crack growth (SCG) and rapid crack propagation ( RCP) capabilities.
3 Conclusion By changing the design parameters, using the combination of finite element analysis method and experiment, the data is compared. The structural form is an important factor affecting the reliability of the seal. Only reasonable design and analysis, and verified by experiments, can effectively avoid the unfavorable factors. In the actual production, it is necessary to improve the serial design of various specifications and find out the regularity in order to meet the safety development and standardization requirements of the gas pipeline network system.
references:
[1] Liu Yuan. Discussion on the performance of PE pipe material [J]. Building Materials World, 2006.
[2] Liu Limei, Yang Dawei. Application of PE Pipe in Gas Pipeline Network[J]. 交通与港航, 2001,.
[3] Fan Yang. Stress analysis and optimization of PE end joints [D]. Xi'an Shiyou University, 2017.
[4] Zuo Jiandong. Numerical analysis of safety assessment of gas pipelines containing defects[D]. Beijing Jiaotong University, 2017.
[5] Yang Yuanquan. Valve Design Manual [M]. Mechanical Industry Press, 1992.
[6] Shen Guilan. Discussion on the application of PE ball valve in PE gas pipeline[J]. 广州化工,2013.
About the author: Xia Shengjian (1987-), male, Han nationality, Zhejiang Yongjia, engineer, undergraduate, Baoyi Group Co., Ltd., engaged in valve technology research and development and standardization work.
Key words: PE-steel gas valve finite element analysis structure optimization annular double-sided helical tooth groove 1 Overview With the rapid development of gas pipelines, PE materials are commonly used as gas materials, and PE-steel gas valves are important as urban gas pipeline network systems. Equipment, its application is very extensive, so considering the safety of gas pipeline network operation equipment, is the main factor considered by the valve manufacturer. However, the conventional structure generally adopts the PE tube sleeved on the outer circumference of the metal steel pipe member, and a steel sealing member is sleeved on the outer circumference of the PE pipe to press and fix the plastic pipe body. The fixing method is not only the sealing property, but also the sealing method. And the stability of the connection is also general, the transmission medium is not only easy to leak during transmission. Especially in the case of buried construction of the installed pipe network system, when the tensile force and pressure change of the site are complicatedly combined, the plastic pipe body is easy to be detached from the steel pipe fitting under the force, so that the joint structure seal is invalid or even disintegrated on site.
2 Structural analysis optimization and verification The anti-leakage and leakage prevention of the PE end of the PE-steel gas valve is the key to the reliability of the valve seal. The anti-extraction structure is a connection form of PE and steel metal parts, and mainly has a tapered bevel shape, a zigzag shape, a threaded spiral tooth structure, and the like; and the sealing structure affecting the end structure has a seal structure, a material property, a welding process Parameters, etc.
Aiming at the deficiencies of the prior art, a new annular double-sided oblique tooth groove structure + double-channel sealing ring + adjustable pre-tensioning device is proposed between the pipe fitting mounting portion and the pipe body mounting portion to realize the pipe fitting and the pipe body. The reliability of the seal structure (as shown). That is, a plurality of annular double-sided helical bevels for preventing the PE pipe from being detached from the metal pipe member are disposed at the outer circumference of the metal pipe member at the end of the valve body, and the double-sided helical tooth groove is favorable for the installation of the PE pipe, and the PE pipe is prevented from being The metal pipe is separated from the metal pipe by the pulling force. A sealing ring structure is arranged on both inner and outer ends of the double-sided helical tooth groove, which can effectively compensate the gap between the PE pipe and the metal pipe member to form a double-channel seal. The external adopts the adjustable pre-tightening device sealing structure, and the PE end is firmly positioned on the metal steel pipe member, and is integrated with the metal steel pipe to form an integral type.
The structure adopts three-dimensional modeling software and finite element analysis software, and the existing commonly used structures such as inverted tooth shape, thread spiral tooth shape and ring double-sided oblique tooth shape are drawn into a three-dimensional model to define material properties, mesh, and add. Constrained load and analytical test values, etc. Under the specific conditions, simulate the results of the analysis of the applied internal pressure load, as shown in the following chart:
It is known from the above table that under certain working conditions and load conditions, when the tooth profile is a ring-shaped double-sided helical tooth, the corresponding equivalent stress and contact stress are optimal. Because the mechanical properties of PE pipe and metal steel are quite different, the theoretical analysis alone cannot be quasi-deterministic. Therefore, only the theoretical data parameters can be verified and compared with the test results. The structural members are subjected to static pressure strength test and dynamic load sealing test, and bending deformation, tensile force, pressure and torsion force in an uncertain direction are applied to check the sealing reliability of the PE end.
Through the test data, the comprehensive toughness of the annular double-sided helical tooth shape is good, and the installation is convenient during hot melt. The helical tooth structure and the adjustable pre-tensioning device mechanism can effectively ensure the connection of the PE pipe and the steel metal piece is firm, and the structure is It is beneficial to the construction operation, and will not cause the PE pipe to break or break due to the uncertainty of construction. At the same time, the ground settlement adaptability is very strong, with seismic performance and good resistance to slow crack growth (SCG) and rapid crack propagation ( RCP) capabilities.
3 Conclusion By changing the design parameters, using the combination of finite element analysis method and experiment, the data is compared. The structural form is an important factor affecting the reliability of the seal. Only reasonable design and analysis, and verified by experiments, can effectively avoid the unfavorable factors. In the actual production, it is necessary to improve the serial design of various specifications and find out the regularity in order to meet the safety development and standardization requirements of the gas pipeline network system.
references:
[1] Liu Yuan. Discussion on the performance of PE pipe material [J]. Building Materials World, 2006.
[2] Liu Limei, Yang Dawei. Application of PE Pipe in Gas Pipeline Network[J]. 交通与港航, 2001,.
[3] Fan Yang. Stress analysis and optimization of PE end joints [D]. Xi'an Shiyou University, 2017.
[4] Zuo Jiandong. Numerical analysis of safety assessment of gas pipelines containing defects[D]. Beijing Jiaotong University, 2017.
[5] Yang Yuanquan. Valve Design Manual [M]. Mechanical Industry Press, 1992.
[6] Shen Guilan. Discussion on the application of PE ball valve in PE gas pipeline[J]. 广州化工,2013.
About the author: Xia Shengjian (1987-), male, Han nationality, Zhejiang Yongjia, engineer, undergraduate, Baoyi Group Co., Ltd., engaged in valve technology research and development and standardization work.
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