How to distinguish between diaphragm, diaphragm box and diaphragm pressure gauge?
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I have always been confused about the structural classification of pressure gauges. I don’t know the differences and application scope of these three? What is the difference in the structure of pressure gauges?
There is no difference in appearance between diaphragm pressure gauges and ordinary pressure gauges, except that the measuring components are different. They are mainly used to measure micro-pressure, and they are both KPa pressure gauges.； Diaphragm pressure gauge as shown in the figure ； A diaphragm pressure gauge is actually a pressure gauge plus an isolation diaphragm, as shown in the figure.
Which is the first diaphragm pressure gauge? Do you need to add pressure-conducting oil to the connection between the pressure gauge and the diaphragm? Otherwise, how to detect the pressure? Is the inside of the second diaphragm also filled with silicone oil? The third one looks a bit like a spring tube. Is there a small diaphragm at the bottom?
Although the diaphragm pressure gauge is structurally composed of two parts, when it leaves the factory, the two parts have been connected and filled with silicone oil. The diaphragm is a mechanical mechanism. The connecting rod is welded to the metal diaphragm, which is then connected to the watch movement. The up and down movement displacement of the diaphragm is transmitted to the connecting rod, which in turn affects the gauge needle indication. Without silicone oil, the diaphragm pressure gauge is somewhat similar to a diaphragm. It is a mechanical connection, not silicone oil. A diaphragm is used instead of a spring tube, and the deformation of the diaphragm is used to drive the movement.
Do you think the diaphragm flange we use is composed of a spring tube and accessories, and then the space between the flange and the spring tube is filled with silicone oil?