PRESSURE SENSOR WITH A DIAPHRAGM AND DEPTH GAUGE COMPRISING THE SAME
First Claim
1. A pressure sensor including a body with a pressure chamber for receiving a fluid and a support element around said chamber, a cover secured to the body and provided with a stop strip that has a closed contour in correspondence with the support element of the body, a diaphragm, which is arranged between the body and the cover to seal off the pressure chamber, and which is capable of bending under the effect of a pressure difference between the two surfaces thereof, with a peripheral region of the diaphragm arranged between said support element and said stop strip, and transmission means, connected to a central region of the diaphragm for transmitting diaphragm deflection data to measuring or indicating means, wherein the diaphragm has an approximately flat shape, in that the peripheral region of the diaphragm can pivot on the stop strip when the diaphragm bends under the effect of an increase in fluid pressure in the pressure chamber, in that said support element is a sealing gasket mounted on the body and compressed between the body and the peripheral region of the diaphragm to press said peripheral region permanently against the stop strip, and in that the sealing gasket is located approximately opposite the stop strip.
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Accused Products
Abstract
The invention concerns a pressure sensor (5), particularly for a depth gauge (1), capable of having a high level of precision, owing to sufficient elastic deflection amplitude of the diaphragm (or membrane), while avoiding any risk of plastic deformation. The diaphragm (12) is formed by a flat metal disc. The peripheral region (13) thereof is neither welded nor inset, but it is pre-stressed against a stop strip (25) with a closed, preferably circular contour, and can pivot on the stop strip (25) when the diaphragm bends under the effect of fluid pressure in the pressure chamber (10). The pre-stressing may be achieved via a sealing gasket (21) located opposite the stop strip (25). Between said strip and a central aperture (15), a concave stop surface (20) limits the deflection of the diaphragm (12) and prevents any plastic deformation in the event of excessive pressure. Manufacture of the diaphragm is simple, with a high level of reproducibility, assembly is easy and the seal quality is high.
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Citations
8 Claims
- 1. A pressure sensor including a body with a pressure chamber for receiving a fluid and a support element around said chamber, a cover secured to the body and provided with a stop strip that has a closed contour in correspondence with the support element of the body, a diaphragm, which is arranged between the body and the cover to seal off the pressure chamber, and which is capable of bending under the effect of a pressure difference between the two surfaces thereof, with a peripheral region of the diaphragm arranged between said support element and said stop strip, and transmission means, connected to a central region of the diaphragm for transmitting diaphragm deflection data to measuring or indicating means, wherein the diaphragm has an approximately flat shape, in that the peripheral region of the diaphragm can pivot on the stop strip when the diaphragm bends under the effect of an increase in fluid pressure in the pressure chamber, in that said support element is a sealing gasket mounted on the body and compressed between the body and the peripheral region of the diaphragm to press said peripheral region permanently against the stop strip, and in that the sealing gasket is located approximately opposite the stop strip.
- 7. The depth gauge with a case containing a pressure sensor including a body with a pressure chamber for receiving a fluid and a support element around said chamber, a cover secured to the body and provided with a stop strip that has a closed contour in correspondence with the support element of the body, a diaphragm, which is arranged between the body and the cover to seal off the pressure chamber, and which is capable of bending under the effect of a pressure difference between the two surfaces thereof, with a peripheral region of the diaphragm arranged between said support element and said stop strip, and transmission means, connected to a central region of the diaphragm for transmitting diaphragm deflection data to measuring or indicating means, wherein the diaphragm has an approximately flat shape, in that the peripheral region of the diaphragm can pivot on the stop strip when the diaphragm bends under the effect of an increase in fluid pressure in the pressure chamber, in that said support element is a sealing gasket mounted on the body and compressed between the body and the peripheral region of the diaphragm to press said peripheral region permanently against the stop strip, and in that the sealing gasket is located approximately opposite the stop strip.
Specification