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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
Add:
No.9 Gaoguannong,Daxue Road,Hangzhou,China
P.C:
310009
E-mail:
meem_contribute@163.com
Abstract: In order to solve seal ring abrasion and disc spring fracture of pressurizer spray valve during operation, taking a pressurizer spray valve in a nuclear power plant as an example, simulation analysis, experimental research, and optimization improvement were conducted on the stress distribution of the disc spring under seal failure. Firstly, a flow channel model of the spray valve with removed seal ring was established by the numerical simulation method. The flow field changes and the stress distribution on the disc spring of the spray valve under different pressure and difference conditions were analyzed. Then, the critical pressure difference of the disc spring being squeezed was obtained by two-dimensional simulation and verified by relevant experiment. Finally, a structural optimization was proposed to solve the problem of excessive pressure difference between the two sides of the disc spring, and numerical calculation was performed to verify it. The research results indicate that in the case of seal failure, the pressure difference on two sides of the disc spring is close to the pressure difference between the inlet and outlet. When the pressure difference on two sides of the disc spring exceeds 0.24MPa, the disc spring can be squeezed out of the valve body. Under normal working conditions, there can also be a large pressure difference on both sides of the disc spring, causing it to detach from the valve body.It is determined that it is one of the reasons for the failure of the disc spring's reciprocating motion and the problem can be effectively solved by using a wave spring instead of disk spring. The research results have certain guiding significance for the structural design of pressurizer spray valve.
Key words: control valve; seal ring abrasion; disc spring fracture; wave spring; pressure difference between two sides of disc spring; flow channel model of spray valve; flow field characteristics in valve
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