两位三通电磁阀结构设计与研究

发布时间：2018-10-21 12:23

【摘要】：自动反冲洗叠片过滤器的反冲洗采用两位三通电磁换向阀进行控制,本论文对两位三通电磁阀进行了结构设计,并且针对电磁阀在换向过程中极易产生水击现象,论文运用FLUENT动网格技术对阀杆的下降过程进行了动态模拟,得出了阀瓣形式及换向时间与阀门换向水击压力之间的关系,提出了通过优化阀瓣形状及换向时间来解决此类阀门水击问题的新思路,最后将阀瓣下降过程中水击压强的数值模拟结果与实验结果进行了对比,结果表明数值模拟的结果是符合实际的。一、根据对关键部位的应力分析和强度校核结果,并参考最新的国内外阀门设计标准对两位三通电磁阀进行了结构设计。二、用Gambit 2.3.16建立了阀门过滤状态及反冲洗状态时的稳态网格模型,对换向过程进行了分析与划分,将一个换向回合分为4个阶段,分别是阀瓣下降过程1、2及阀瓣上升过程1、2,并用Gambit建立了各个阶段初始时刻的动网格模型,设置了相应的动网格边界条件,之后将网格模型导入FLUENT6.3.26,对两位三通电磁换向阀进行了稳态及换向过程的动态模拟。模拟结果表明：通过观察换向过程最终时刻的速度和压力分布图,发现阀门在换向时没有发生气蚀和水击现象。三、除了两位三通电磁阀常用的快开阀瓣,本文将三种典型的调节阀阀瓣用于此阀主阀,对主阀阀瓣下降过程中的水击压强进行对比,结果发现快开阀瓣在下降的初始阶段压强较高,为了安全起见,建议采用调节阀阀瓣。四、通过对下降过程2、上升过程1不同换向时间的水击压强进行对比发现,阀瓣上升时间不同,最大压强分布的位置和数值也不同,为了安全起见,对于不同的换向时间,应该分别做模拟,找出最大压强所在的位置,采取必要措施,如阀体壁厚局部加厚等措施,提高阀体强度,保证阀门的安全运行。且换向时间越短,产生最大压强时,压力场的分布越不均匀,阀门流场内压力差越大,阀门运行越不平稳,此时容易造成阀体的振动。
[Abstract]:The backwash of automatic backwash laminated filter is controlled by two-position three-way electromagnetic directional valve. In this paper, the structure of two-position three-way solenoid valve is designed, and the phenomenon of water hammer is easy to occur in the process of reversing solenoid valve. In this paper, the dynamic simulation of the descending process of valve stem is carried out by using FLUENT dynamic grid technology, and the relationship between valve disc form and reversing time and valve reversing water hammer pressure is obtained. A new idea to solve the water hammer problem of this kind of valve by optimizing the disc shape and reversing time is put forward. Finally, the numerical simulation results of the water hammer pressure during the disc descent are compared with the experimental results. The results show that the numerical simulation results are in line with the actual results. The main contents are as follows: 1. According to the stress analysis and strength check results of the key parts, and referring to the latest valve design standards at home and abroad, the structure design of the two-position three-way solenoid valve is carried out. Secondly, using Gambit 2.3.16, the steady-state mesh model of valve filtration and backwash is established, and the commutation process is analyzed and divided into four stages. The disc descent process and the disc rising process are respectively 1 / 2 and 1 / 2 respectively. The dynamic mesh model at the initial time of each stage is established with Gambit, and the corresponding dynamic grid boundary conditions are set up. Then the grid model is introduced into FLUENT6.3.26, to simulate the steady-state and commutation process of the two-position three-way solenoid reversing valve. The simulation results show that there is no cavitation erosion and water hammer in the valve by observing the velocity and pressure distribution at the final moment of the reversing process. Third, in addition to the quick opening disc commonly used in the two-position three-way solenoid valve, this paper applies three typical regulating valve discs to this valve main valve, and compares the water hammer pressure during the main valve disc descent. It is found that the pressure of the fast-opening disc is high in the initial stage of lowering. For safety reasons, it is recommended to adopt the regulating valve disc. Fourthly, by comparing the water hammer pressure at different commutation times in the descending process 2 and the rising process 1, it is found that the position and value of the maximum pressure distribution are also different with the different rising time of the disc. For the sake of safety, for different commutation times, Simulation should be done separately to find out the location of the maximum pressure and take necessary measures such as partial thickening of the body wall to improve the strength of the valve and ensure the safe operation of the valve. The shorter the commutation time is, the more uneven the pressure field is, the greater the pressure difference in the valve flow field is, and the more unstable the valve operation is, and the vibration of the valve body is easy to be caused at this time.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH134

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