全压式交变机的设计与试验  

Design and Experiment of Comprehensive Alternating Pressure Testing Machine

作　　者：甘蓉[1] 郝罗亮[1] 汪帅[1] 张剑霜 刘莎 GAN Rong;HAO Luoliang;WANG Shuai;ZHANG Jianshuang;LIU Sha(National Institute of Measurement and Testing Technology,Chengdu 610021,China)

机构地区：[1]中国测试技术研究院

出　　处：《西南交通大学学报》2019年第6期1293-1297,共5页Journal of Southwest Jiaotong University

摘　　要：由于目前活塞往复式交变试验机无法对气体介质压力仪表、真空仪表、正负压压力仪表及差压类压力仪表在静压环境下进行交变试验,设计了能在上述环境下进行交变试验的全压式交变机.首先按照一般压力表、精密压力表和数字压力计型评大纲中对交变试验要求的上限、下限、频率和次数等参数进行分析;其次通过对可产生正弦压力波的发生装置进行选型,通过计数器采集正弦波频率,并控制进气电磁阀在规定的交变次数内试验自动停止.样机试验结果表明:通过可控进、出气电磁阀产生的压力正弦波上限、下限和频率范围覆盖型评大纲要求的范围,上、下限控制误差不大于0.3%;通过可控进、出气流量阀控制的交变频率误差为型评大纲要求的不大于±5次/min;计数模块统计次数与实际试验次数一致.At present, the piston reciprocating alternating testing machine can not be used in the alternating tests for gas medium pressure instruments, vacuum instruments, positive and negative pressure gauges and differential pressure instruments under a static pressure environment. A comprehensive alternating pressure testing machine was designed to operate under this environment. Firstly, according to the upper and lower limits of the alternating test requirements for general pressure gauges, precision pressure gauges and digital pressure gauges, frequency and times parameters are analyzed. Secondly, the sinusoidal pressure pulse generator is selected, the sinusoidal frequency is collected by a counter, and the inlet solenoid valve is controlled to automatically stop testing within the preset alternating times. The experimental results of the designed prototype show that the upper limit, lower limit and frequency range of the pressure sine wave produced by the controllable inlet and outlet solenoid valves fall in the range of the evaluation program, and the control error between upper and lower limited data is limited as 0.3%.The alternating frequency error by the controllable inlet and outlet flow valves shall be no more than± 5 times/min, which meets the requirement of the evaluation program. The number recorded by the counter is consistent with the number of actual tests.

关 键 词：压力交变试验 电磁阀 自动控制 

分 类 号：TH812[机械工程—仪器科学与技术]