High voltage-resistant bi-directional elliptic gear flow meter
An oval gear, high-pressure technology, applied in the measurement of flow/mass flow, liquid/fluid solid measurement, measurement devices, etc., can solve the problems of uneven pulse period of Hall element, low measurement accuracy and response speed, etc. Simple, easy to process, increase the effect of magnetic induction
Inactive Publication Date: 2008-01-02
ZHEJIANG UNIV +1
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Problems solved by technology
Traditional elliptical flowmeters can only be used in low-pressure environments and cannot fully meet the needs of the domestic market
The invention patent JP2306122 "Positive Displacement Flowmeter" discloses an oval gear flowmeter. The end surface of the oval gear is arranged with multiple magnetic steels. The Hall sensor is used to detect the rotor rotation angle displacement signal to measure the flow rate. The resolution is high, but due to the constant flow rate Due to the non-uniformity of the angular velocity of the oval gear, the pulse period output by the Hall element is uneven, and the measurement accuracy and response speed are not high. In addition, the upper end cover for placing the Hall element must be made of non-magnetic material, which is not suitable for For use with high-pressure liquids
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[0020] The present invention will be further described below in conjunction with drawings and embodiments.
[0021] As shown in Figures 1, 2, 3, and 4, the upper end cover 3, the shell 2 with an annular cavity in the middle, and the lower end cover 1 plus a sealing ring 16 form a high-pressure resistant airtight cavity; the airtight cavity has two parallel first 1. The second gear shafts 6, 7 are respectively supported in the corresponding shaft holes in the upper end cover 3 and the lower end cover 1, and the first and second gear shafts 6, 7 are respectively equipped with a first and second elliptical gears meshing with each other. Gears 4, 5; on one end face of the first oval gear 4, arranged at 180° with the first gear shaft 6 as the center, respectively embedded with the first and second magnetic steels 8, 9 with opposite N poles and S poles; the upper end cover 3, there are first and second small holes 14, 15 distributed at 90° with the first gear shaft 6 as the center r...
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The invention discloses a gear flow meter, which comprises: an anti-high pressure sealed cavity with a top cover, a hollow ring shell, and a bottom cover fixed by bolts, two parallel gear shifts fixed in the cavity and supported in the shift holes of top and bottom covers, two engaged oval gears every with two magnetic steels on the gear shift, two anti-high pressure non-magnetic insulation pieces every with a magneto-dependent sensor on top both welded on bottom ends of the top cover. Wherein, it compares the phase lead and lag of square wave signals from two sensors to decide the flow direction with high precision, stable performance, and large range.
Description
technical field [0001] The invention relates to a liquid volumetric flowmeter, in particular to a high-pressure resistant bidirectional oval gear flowmeter. Background technique [0002] In fields closely related to human development, such as industrial production, scientific experiments, energy measurement, transportation, and social life, flow is an important parameter that needs to be frequently measured and controlled. Oval gear flowmeters are widely used in industry because of their high measurement accuracy, small oil temperature influence and pressure loss, simple installation, stable performance, and large measuring range. Traditional elliptical flowmeters can only be used in low-pressure environments and cannot fully meet the needs of the domestic market. The invention patent JP2306122 "Positive Displacement Flowmeter" discloses an oval gear flowmeter. The end surface of the oval gear is arranged with multiple magnetic steels. The Hall sensor is used to detect the ...
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IPC IPC(8): G01F11/44G01F3/10
Inventor 丁凡李宾翁振涛李勇
Owner ZHEJIANG UNIV