Hydraulic oil type high-stability pressure sensor

Abstract

The invention discloses a hydraulic oil type high-stability pressure sensor, belonging to the field of sensors and solving the problems of very difficult assembly, uneven thrust surfaces of pressure sensitive diaphragms, and inaccurate pressure detection caused by the mechanical transmission method of the existing sensor. The technical point is that the sensor comprises: a lower pressing block, asensor upper casing, a hydraulic column and a sensor lower casing, wherein the middle part of the bottom end of the sensor upper casing is fixedly connected to the hydraulic column, and the bottom side of the hydraulic column is connected to the sensor lower casing through a threaded portion. As the applied pressure is received by arranging the lower pressing block that can slide up and down in the sensor upper casing or the pressure receiving base abuts against the pressure applying object, the detection signal is transmitted by the sensor core after applying force to or detecting the siliconpiezoresistive sensing element by transmitting the hydraulic oil to the diaphragm of the force sensitive area, which eliminates the influence of the hydraulic oil chamber on its dynamic test, fully guarantees the dynamic frequency response characteristics of the sensor, and fully meets the response frequency required by the dynamic pressure test.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a hydraulic oil type highly stable pressure sensor. Background technique [0002] A pressure sensor is a device or device that can sense pressure signals and convert the pressure signals into usable output electrical signals according to certain rules. It is the most commonly used sensor in industrial practice. Pressure sensors are also widely installed on motor vehicles. With the rapid development of sensor technology, the types of sensors include differential pressure sensors, pressure sensors, ultrasonic sensors, etc. Among them, pressure sensors often have poor static pressure performance due to the internal structure of the sensor and the layout of the chip, resulting in poor sensor performance. The working stability during the working process is not good; at the same time, the overvoltage performance is usually determined by the sensor chip, which leads to the limitation of the over...

AI Technical Summary

Problems solved by technology

With the rapid development of sensor technology, the types of sensors include differential pressure sensors, pressure sensors, ultrasonic sensors, etc. Among them, pressure sensors often have poor static pressure performance due to the internal structure of the sensor and the layout of the chip, resulting in poor sensor performance. The working stability is not good during the working process; at the same time, the overvoltage performance is usually determined by the sensor chip, which leads to the limitation of the overvoltage performance of the pressure sensor, making it difficult for the sensor to adapt to a more complex working environment

[0003] Chinese patent CN207964133U discloses a pressure sensor with good insulation, including: connector, housing, sensor inner core, insulating sleeve 1, limit buckle, insulating pad, insulating sleeve 2, insulating ring, circuit board, sealing waterproof layer, Signal line, the housing is fixed above the joint, the sensor inner core is assembled inside the joint, and an insulating sleeve 1 is assembled on the periphery of the sensor inner core, and the limit buckle is installed above the sensor inner core. It realizes the advantages of novel structure and good sealing performance. However, this kind of pressure sensor is difficult to assemble, the force surface of the pressure-sensitive diaphragm is uneven, and the mechanical transmission method causes inaccurate pressure detection.

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