Differential pressure type flow sensor capable of realizing direct pressure tapping and two-way measurement

Abstract

The invention relates to a differential pressure type flow sensor capable of realizing direct pressure tapping and two-way measurement, which solves the problems that a differential pressure type flowmeter must be provided with a pressure guiding pipe, has large occupation space, lower measuring precision and narrower range and can only measure flow along one direction in prior art. The differential pressure type flow sensor is characterized in that a shell is internally welded with a throttle disc with symmetrical double surfaces, a pipe wall of the shell is provided with pressure guiding hole, the shell is provided with a pressure tapping sylphon corresponding to the pressure guiding hole, the pressure tapping sylphon is internally provided with a coplanar pressure tapping type differential pressure transmitter with the precision of 0.04 percent, and the pressure tapping sylphon is also externally connected with a differential pressure flow converter which can realize the two-direction measurement of flow, has flow output ranged from 4 to 20 mA and a zero point of 12 mA. The invention has the advantage that the pressure tapping sylphon is attached to the wall of the shell so as to omit the traditional pressure guiding pipe, thereby having compact structure, eliminating the standstill space of bubbles on mechanism and overcoming the flow measurement fluctuation caused in such a way that the bubbles stop in the pressure guiding pipe, and the differential pressure transmitter can realize positive and negative two-direction flow measurement.

Description

technical field [0001] The invention belongs to a differential pressure flow sensor, in particular to a differential pressure flow sensor which is suitable for measuring the flow of liquid, gas and vapor and can realize direct pressure acquisition and bidirectional measurement. technical background [0002] Differential pressure flowmeter is the most typical and most widely used flow sensor for flow detection at home and abroad. The differential pressure flowmeter in the prior art must be equipped with a pressure guide conduit, which is connected to the differential pressure transmitter through the pressure guide conduit. When the instrument is put into operation for the first time, bubbles will be trapped in the pressure guide conduit, causing measurement errors; and the pressure guide conduit The installation of the vertical or horizontal planes should be kept at an inclination of not less than 1:10, and gas, condensate, particle collectors and settlers need to be installe...

AI Technical Summary

Problems solved by technology

[0003] (1) The measurement accuracy is generally low;

[0004] (2) The range is relatively narrow, generally only 3:1 to 4:1;

[0005] (3) High requirements for on-site installation conditions;

[0006] (4) Large pressure loss (such as orifice plate, nozzle, etc.)

[0007] In addition, the differential pressure flowmeter in the prior art can only measure the flow in one direction. In order to realize the two-way measurement, two differential pressure transmitters and two sets of pressure guide conduit systems need to be installed, which takes up more space and makes the installation more complicated.

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