Diaphragm

Film-like elastic sensitive element.whenCoupling diaphragmWhen the two sides of the diaphragm are subjected to different pressures (or forces), the diaphragm moves to the side with lower pressure, causing it to produce a displacement related to the pressure difference.There are mainly three types of diaphragms: flat diaphragm, vertical chain diaphragm and corrugated diaphragm.The flat diaphragm can be divided into multiple forms according to whether the periphery is fixedly supported, whether it is open or not, and the force distribution of the diaphragm area. Among them, the flat diaphragm composed of a circular thin plate with constant cross section fixed on the periphery is commonly used.The vertical chain diaphragm consists of a circular plate with a groove near the edge, and its elastic strain mainly occurs at the edge annular groove. This kind of diaphragm compression strain tube or column is commonly used to achieve pressure measurement.The hard part of the vertical chain diaphragm is close to translation when it is moved under pressure, so it is better for capacitive sensors or piezoelectric sensors.The corrugated diaphragm is pressed with ring-shaped concentric corrugations.In order to increase the displacement of the diaphragm, two diaphragms can be welded together to form a diaphragm, or several diaphragms can be connected in series to form a diaphragm group.

It is composed of a single layer or multiple layers coated with glue on both sides, and there are also rubbers that do not sandwich the fabric.According to its shape, the method is divided into membrane pressure method.Diaphragms of different rubber materials and fabrics can be manufactured according to the requirements of use.The performance of the blend of nitrile rubber and polysulfide rubber used in the diaphragm, the performance of the rubber used in the canvas disc diaphragm (often called the diaphragm) and the development of some silicone rubber, fluorine rubber, and chlorohydrin rubber in recent years Diaphragm. 　　

The working temperature range and pressure range of the diaphragm itself depend on the type of rubber, fabric and structure.The diaphragm can work under the conditions of -50~100 degrees Celsius and 0.4~0.8MPa; the fluoroelastomer and silicone rubber diaphragm can work under the conditions of -80~232 degrees Celsius.The chlorohydrin rubber diaphragm can work under the pressure of 0.4~0.8MPa, with good air tightness, aging resistance, and the service life is equal to that of the engine overhaul.