Fluid pressure sensing device

A sensing device and fluid pressure technology, which is applied in the direction of fluid pressure measurement involving magnet displacement, can solve the problems of small pressure measurement range, low magnetic field strength, and reduced test sensitivity, so as to increase the pressure measurement range and radial magnetic field. The effect of strengthening the strength and expanding the measurement adaptation surface

Inactive Publication Date: 2009-08-05
苏文彪
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing fluid pressure sensing devices generally use the deformation of the diaphragm to convert it into an electrical signal; some also use a Hall sensor to capture the moving signal of a nearby magnet. Since the magnet needs to move with the fluid, it is impossible to use a larger volume magnet. Otherwise, the test lower limit is high and the adaptable surface is small; if a smaller volume magnet is used, the magnetic field strength is lower, which also leads to a decrease in test sensitivity; ordinary Hall sensors can only respond to positive or negative magnetic fields, and the pressure measurement range is small

Method used

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  • Fluid pressure sensing device

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Embodiment Construction

[0014] Refer to attached picture. Embodiment The housing is made into a barrel shape, and the housing 1 is integrated with a tubular object with an inlet 13 and an outlet 14 at the bottom, and the tubular object communicates with the inner cavity of the housing through a through hole 12, so that the measured fluid enters the inner cavity of the housing . The upper edge of the housing 1 and the end cover 2 are fastened by screws 10 and bonded to the upper cover 3 , or the upper cover 3 , the end cover 2 and the housing 1 are fastened together by the screws 10 . The housing 1 is equipped with a piston 8, and the top end of the piston rod 8.1 made of the piston 8 is fixed with a screw 4 to fix the ring-shaped upper magnet 5 and is located on the upper surface of the end cover 2, and the step made in the middle of the piston rod 8.1 is provided by a circlip 6. Fix the ring-shaped lower magnet 7, and the two magnets are arranged with polarities repelling each other, as shown in th...

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Abstract

The invention relates to a fluid pressure sensing device, comprising a casing (1) and an end cover (2), wherein a piston (8) is installed in the casing (1), and a piston rod (8.1) is arranged on the piston rod (8.1) with repulsive polarity. A magnet (5) and a lower magnet (7), a magnetic sensor is fixed between the two magnets with polarity repulsive, and a Hall sensor (11) is used for the magnetic sensor. The design of the invention strengthens the radial magnetic field strength of the ring-shaped magnet, and the sensitivity of the magnetic sensor is obviously improved; in addition, for different test lower limits, it is only necessary to replace the springs with different elastic forces, and the measurement adaptability is enlarged; the bipolar Hall is adopted. sensor to increase the pressure measurement range.

Description

Technical field: [0001] The invention relates to pressure measurement technology, in particular to a fluid pressure sensing device. Background technique: [0002] Existing fluid pressure sensing devices generally use the deformation of the diaphragm to convert it into an electrical signal; some also use a Hall sensor to capture the moving signal of a nearby magnet. Since the magnet needs to move with the fluid, it is impossible to use a larger volume magnet. Otherwise, the test lower limit is high and the adaptable surface is small; if a smaller volume magnet is used, the magnetic field strength is lower, which also leads to a decrease in test sensitivity; ordinary Hall sensors can only respond to positive or negative magnetic fields, and the pressure measurement range is small. Invention content: [0003] The purpose of the present invention is to provide a fluid pressure sensing device with a large adaptable range and high test sensitivity. [0004] A fluid pressure sen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L9/14
Inventor 苏文彪
Owner 苏文彪
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