Differential pressure sensor

Abstract

The invention discloses a differential meter, comprising a sealed shell, a first sensing element, a second sensing element, two cavities respectively surrounded by the two sensing elements, a long connecting bar, a short connecting bar, a swing stem and a gear cluster which are used for transmitting and amplifying the deformation of the sensing elements, a pointer used for indicating pressure change and a spring which can lead the pointer to reset. The differential meter also comprises a deformation sensing device used for sensing the deformation of the first sensing element or the second sensing element. The differential meter has two output ways of mechanical header display and electric signal output, thus being capable of feedbacking the pressure difference of a container and a device to be measured to an electric control system and facilitating industrial control; in addition, not only static pressure is increased but also the manufacturing process is simplified.

Description

technical field [0001] The invention relates to a pressure measuring device, in particular to a differential pressure sensor for pressure differential control. Background technique [0002] In industries such as electrical engineering and instrumentation, it is often required to control the pressure difference of containers and equipment. At this time, differential pressure sensors are often used. At present, in the preparation of differential pressure sensors, most of the elastic sensitive elements in them use Bourdon tubes, bellows and diaphragms. For Bourdon tube type and bellows type differential pressure sensors, the positive and negative pressure chambers are the same elastic element, and the pressure acts on one side of the elastic element, so there is a problem of low static pressure during use. However, the structure of the diaphragm type differential pressure sensor is complicated, and the inside needs to be filled with oil and vacuumized, thus making the cost hig...

AI Technical Summary

Problems solved by technology

For Bourdon tube type and bellows type differential pressure sensors, the positive and negative pressure chambers are the same elastic element, and the pressure acts on one side of the elastic element, so there is a problem of low static pressure in use

The structure of the diaphragm type differential pressure sensor is complex, and the interior needs to be filled with oil and vacuumized, which makes the cost higher

At the same time, these differential pressure sensors only have a mechanical gauge display, cannot output electrical signals, and cannot be connected to an automatic control system. Therefore, they cannot effectively control the rate of change of internal and external pressure of containers and equipment and the size of the pressure difference, which greatly restricts the differential pressure. Sensor application

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