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七、示功图压力标定完整的示功图上应该有大气压力线(或某一已知压力线)和压力比例尺,以便建立压力座标,确定压力曲线上每一点压力绝对值。压力比例尺可由传感器本身特性曲线决定,也可在试验现场利用压力校验装置作出实际压力灵敏度特性曲线。压力标定的任务是在示功图上确定大气线(或已知压力线)。 1.三通阀切换压力传感器经过三通阀与气缸相联接,图16是示功专用三通旋塞阀,采用恒压紧力结构,用于低压测量。阀芯为倒锥体,锥度1/5,靠弹簧力压紧在阀体上。阀芯转动过程中,压紧力不变,操作灵活。该结构能保证阀芯阀体
VII. Kinetic chart pressure calibration The complete chart should have atmospheric pressure line (or a known pressure line) and pressure scale, in order to establish pressure coordinates, to determine the absolute pressure value of each point on the pressure curve. Pressure scale can be determined by the sensor itself characteristic curve, but also can be used at the test site pressure calibration device to make the actual pressure sensitivity curve. The task of pressure calibration is to determine the atmosphere (or known pressure line) on the dynamometer. 1. Three-way valve switching pressure sensor connected to the cylinder through the three-way valve, shown in Figure 16 is a dedicated three-way plug valve, the use of constant pressure force structure for low pressure measurement. Valve cone inverted body, taper 1/5, by the spring force on the valve body. Valve core rotation process, the same pressure, flexible operation. This structure ensures the valve body