Large-overload stop structure of diaphragm type pressure signal device

Abstract

The invention relates to a large-overload stop structure of a diaphragm type pressure signal device, and belongs to aviation airborne technologies. The large-overload stop structure includes a stop plate with a step profile, and a sensing portion of the pressure signal device is composed of a ripple diaphragm and the stop plate; peaks of the ripple diaphragm are in one to one correspondence with steps of the stop plate, and heights of the steps of the stop plate correspond to displacement values of the peaks in the working pressure state of the ripple membrane. The large-overload stop structure has the advantages of compact size, low weight and good stop effect, the overload born by a diaphragm can be removed fully, the overload stress is reduced, and the fatigue life of the diaphragm is improved.

Description

technical field [0001] The invention belongs to the aviation airborne technology, and relates to a large overload stop structure of a diaphragm pressure signal device. Background technique [0002] The working principle of the diaphragm pressure signal see figure 1 , The corrugated diaphragm deflects and deforms after feeling the working pressure from below, and produces an upward displacement, thereby changing the on-off state between the contacts and outputting a switch signal. See the basic structure of the pressure signal figure 2 , Compared with the working principle diagram, the stop plate assembly is added in the actual structure. When assembling, the stop plate is close to the top of the diaphragm. Its function is to limit the diaphragm corrugation when the diaphragm bears a load exceeding the working pressure, remove the load, prevent excessive deformation of the diaphragm, and avoid failure and damage. [0003] The stop plate can significantly improve the overl...

AI Technical Summary

Problems solved by technology

Its characteristic is that the stop profile is completely consistent with the diaphragm, and the unloading is sufficient, but the product structure is complex, the process is cumbersome, and the volume and weight are large; Figure 4b It is a mechanically processed stop plate with a tapered surface. Under the action of pressure, the peak of the diaphragm fits on the tapered surface of the stop plate to stop.

Its structure is simple and compact, and it is easy to process and assemble, but the shape of the stop cone surface and the diaphragm working strain state cannot be completely matched, and the unloading effect is poor.

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