Design of Spring Constants for Pressure Regulator and Flow-Field Analysis of the De-Humidifier for a Pneumatic System

• Main Authors: Chia-Hung Liu, 劉家宏
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/64466801046921408813

碩士 === 龍華科技大學 === 工程技術研究所 === 98 === Pneumatic system has been widely used in the industry as an essential power supply. For properly operating of the system, air pressure needs to be maintained at a stable range. However, air pressure is subject to change due to the load variation of the system. A pressure regulator is therefore installed to soothe the instability of the pressure. Pressure regulator is controlled by two springs, which acting on the valve of the regulator adjusts valve position for pressure control. The purpose of thisresearch is to propose a design method to determine the spring constants for the pressureregulator. Pressure distribution obtained from computation is adopted for spring force balance. Least square method is used to obtain the adequate spring constants based on the opening of the vale and forces on the valve such that outlet pressure can be maintain at constant value. Two different values, i.e. 200kPa and 400 kPa are considered just for verification purpose. To enhance the lifetime of the system, a de-humidifier is also installed to keep air clean and dry. It is believed that the de-humidifier creates a swirling velocity of the air thus generates centrifugal force to the water droplet for removing. This research adjusts the angle of the guide vane of the de-humidifier, and performs flow field simulation on the de-humidifier. The result shows that the smaller the angle of the guide vane is the larger its swirling velocity is, which could mean a better de-humidifying effect, however, larger pressure drop is obtained.