| With the concept of "Smart City" put forward, based on information technology and automation, infrastructure operators are seeking to deal with the challenge of pop-ulation growth and resource waste through intelligent solutions.Dynamic flow balance valve, as a kind of self-operated flow control valve is becoming increasingly popular in the field of Heating Ventilation Air Conditioning (HVAC) and building automation center. However, domestic products are mainly got from imitation, research methods are relatively backward and products long-term depend on imports. In the theoretical research aspects of dynamic flow balance valve, the traditional physical samples and tests and the theory calculation formula of opening curve can not satisfy the require-ment of flow control accuracy today. At the same time, prominent vibration problems seriously affect the usefulness of the device in the condition of high differential pres-sure and small opening. In response to this series of questions, taking dynamic flow balance valve developed by Lanzhou University of Technology and Zhejiang Dunan Valve Co., Ltd. as study objects, completed with funding from Zhejiang Province Technology Innovation Project (NO.:xxx), a series of studies are carried out.(1)The structural features of dynamic flow balance valve were introduced detai-ledly. The working principle of dynamic flow balance valve to maintain constant flow was described. The lateral variable opening curve’s theoretical calculation formula of dynamic flow balance valve core was deduced and revised, and the improved formula of gap flow was obtained.(2)The flow model of dynamic flow balance valve for static, dynamic visualiza-tion research was performed by using Fluent of CFD commercial software, and all kinds of information of internal flow field were obtained through simulation. The dia-gram of pressure, velocity inside the flow field under different working conditions were received through static simulation, and focus on the research of the quasi dy-namic imbalance force’s effect on the flow control accuracy, at the same time discuss the regularity of gap flow between valve core and valve core shell. The flow field in-formation under different time was gained through dynamic simulation, and focus on the research of the valve core inside with sleeve structure optimizations on pressure, velocity fluctuations.(3)The vibration mechanism of the dynamic flow balance valve was researched, and the model of fluid-solid coupling was analyzed by using software ANSYS Work- bench, the optimization scheme to relieve vibration was proposed combined with theoretical studies and simulation, different optimization schemes which act on com-ponent frequencies of valve core and the maximum displacement of vibration ampli-tude was explored.(4)Dynamic flow balance valve’s initial prototype was tested by building a high-precision test bench, and proposed a series of modification plans, researched the influence of different modification plans on flow control accuracy, and verified the reliability of numerical simulation and the feasibility of correction method.Through a series of analysis and optimization research of dynamic flow balance valve, flow control accuracy was reached±5%, stability was gradually increased, and the accuracy of the simulation was verified. The series of studies which provides a reference for improving valve design in future. |
