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Besonance sensor for measuring liquid density

A liquid density and sensor technology, applied in measuring devices, specific gravity measurement, instruments, etc., can solve the problems of affecting the accuracy of measurement, difficult to work stably and reliably, and achieve the effect of small heat affected zone, simple mode shape, and stable and reliable work.

Inactive Publication Date: 2006-09-20
BEIHANG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent 89217849.3 discloses a vibrating diaphragm density sensor. Its diaphragm is fixed on the base through a die, and there is a slope attenuation band between the fixed periphery and the effective vibration surface, and it is separated. The vibrator of the type density sensor uses an electromagnetic coil, and the vibrator uses a semiconductor strain gauge, and it must be installed on both sides of the diaphragm. If the density of the liquid is to be measured, both sides of the diaphragm must be in contact with the liquid. , in fact, this structure needs to be completely insulated for protection, otherwise it will affect the accuracy of the measurement, and the work is not easy to be stable and reliable

Method used

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  • Besonance sensor for measuring liquid density
  • Besonance sensor for measuring liquid density
  • Besonance sensor for measuring liquid density

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Embodiment Construction

[0020] Such as Figure 1-10 As shown, the present invention consists of a diaphragm circuit box 1, a diaphragm base 2, a piezoelectric exciter 3, a diaphragm 4, a diaphragm box flange structure 5, a piezoelectric vibration pickup 6 and an end cover 7, Diaphragm 4 and diaphragm base 2 are welded together by vacuum electron beam welding, diaphragm base 2 and diaphragm box flange structure 5 are connected by thread, diaphragm base 3 and diaphragm circuit box 1 are connected by thread , The piezoelectric vibrator 3 and the piezoelectric pickup 6 are pasted on the same side of the diaphragm, which is different from the previous diaphragm density sensor. The measured liquid is connected with the liquid container through the flange connection 5 of the box body, and the end cover 7 covers the diaphragm circuit box 1 .

[0021] As shown in Figures 2 and 3, the diaphragm 4 is the most important part of the sensor, so the elastic alloy steel 3J53 is used, and its processing quality dire...

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Abstract

This invention relates to resonant-type measuring liquor density sensor. It includes chaff, chaff base seat, r, piezo-electric vibration pick-up, chaff circuit box, chaff box flange structure and end shield. Chaff processing must ensure planeness and parallelism of the two surfaces in sensor structure. The chaff and the base seat is welded as a integer by vacuum digital bundle welding, the flange structure is connected to the base seat through screw thread, the piezo-electric vibration pick-up and piezo-electric vibrator are separately pasted to same side of the chaff. Then chaff circuit is connected to the seat though screw thread. There is no need of insulation in this system; measuring precision is high, stable and reliable.

Description

technical field [0001] The invention relates to a resonant sensor for measuring liquid density, which is used for measuring liquid density. Background technique [0002] At present, many scientific researchers are already studying the method of measuring density with the principle of resonance, but most of them are in the research and development stage and have not yet reached the stage of finished product. Since the measurement of density is often affected by temperature and pressure, in addition to measuring mass and volume, the pressure and temperature must also be accurately measured. Chinese patent 89217849.3 discloses a vibrating diaphragm density sensor. Its diaphragm is fixed on the base through a die, and there is a slope attenuation band between the fixed periphery and the effective vibration surface, and it is separated. The vibrator of the type density sensor uses an electromagnetic coil, and the vibrator uses a semiconductor strain gauge, and it must be install...

Claims

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Application Information

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IPC IPC(8): G01N9/24
Inventor 樊尚春张欲晓
Owner BEIHANG UNIV
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