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In-built middle through-hole dynamic throttling element flow meter

A technology of throttling elements and flowmeters, which is applied in the direction of detecting fluid flow by measuring pressure difference, volume/mass flow generated by mechanical effects, etc. It can solve problems such as weak pressure resistance, errors, and unsuitable measurement occasions, and achieve pressure resistance Strong ability, high precision, and simple anti-clogging mechanism

Active Publication Date: 2013-11-13
YANGZHOU HONGWEI MASCH EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned flowmeter adopts a thin-walled elastic diaphragm or bellows, which has weak pressure resistance and is not suitable for measuring occasions where the absolute pressure of the measured fluid is high.
In addition, when the dynamic throttling element in the middle through hole is displaced in the axial direction, the thrust of the fluid acting on the dynamic throttling element is not only balanced by the rebound force of the elastic element of the force sensor, but part of the thrust is also balanced by the elastic diaphragm or bellows. The rebound force is balanced, and the stiffness of the elastic diaphragm or bellows is related to the absolute pressure of the measured fluid, which often produces additional errors

Method used

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  • In-built middle through-hole dynamic throttling element flow meter
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  • In-built middle through-hole dynamic throttling element flow meter

Examples

Experimental program
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Effect test

Embodiment 1

[0015] exist figure 1 In the embodiment, the dynamic Venturi tube 4 is built in a rigid pressure-resistant shell composed of the front end tube 3, the rear end tube 3 and the casing 5, and the weight of the dynamic Venturi tube 4 is determined by two pieces arranged at its two ends. Supported by two elastic supporting elements 9, in the present embodiment and the following embodiments, the elastic supporting elements 9 all adopt metal sheet slings 9, and the metal sheet slings 9 are made of very thin elastic metal sheets. is very small, so the rebound force generated by its deformation is also very small, so it can be considered that the thrust received by the moving Venturi tube 4 F It is only balanced by the rebound force of the force sensor 6 elastic elements. In this embodiment and the following embodiments, the elastic support element 9 can also be changed to a suspension wire, a cross-shaped leaf spring, a spoke-type circular spring and a flexible hinge. Most of the fl...

Embodiment 2

[0035] exist figure 2 In the implementation scheme, it can be seen that this example and figure 1 Embodiment 1 is substantially the same in structure, except that the flexible filter medium 1 is not filled in the two annular gaps between the moving Venturi tube 4 and the two end pipes 3, but two and end pipes 3 and 3 are used. A cylindrical filter membrane 2 with the same diameter as the movable venturi tube 4, the two ends of each filter membrane 2 are respectively connected to one end of the movable venturi tube 4 and the end pipe 3 near the end, and the filter membrane 2 can follow the moving The axial movement of the Venturi tube 4 makes the axial expansion and contraction of the same size to ensure that the fluid can only pass through the two filter membranes 2 to enter and exit the above two annular gaps. The cylindrical filter membrane 2 can be made of ordinary fiber fabric, or an inorganic microfiltration membrane or an organic microfiltration membrane using membrane...

Embodiment 3

[0037] exist image 3 In the embodiment, the Venturi tube 4 is built in a rigid pressure-resistant shell composed of the front and rear end pipes 3 and the casing 5. Use two ring-shaped first capacitor outer pole plates 10 and the second capacitor outer pole plate 12, the inner edges of these two capacitor outer pole plates 10,12 are all sealed with the moving Venturi tube 4 front ends; Large and small circular capacitor inner plates 11, the outer edges of the capacitor inner plates 11 are fixedly connected to the rigid pressure-resistant housing, and the above three plates constitute a differential capacitance sensitive element. Two annular elastic diaphragms 13 are used, the outer edges of the two annular elastic diaphragms 13 are respectively sealed and connected with the rigid pressure-resistant housing, and the inner edges of the two annular elastic diaphragms 13 are not directly sealed and connected with the moving Venturi tube 4, Instead, it is connected to the outer e...

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Abstract

The invention discloses an in-built middle through-hole dynamic throttling element flow meter, belonging to the technical field of automatic detection of a throttling flow meter. The flow meter is characterized in that an in-built middle through-hole dynamic throttling element is adopted; the internal and external pressures of the dynamic throttling element are balanced; the measured fluid pressure is born by a flow meter pressure hull, thus, a thin wall thick dynamic throttling element can be used; the main boy of an anti-blocking mechanism is a flexible filter medium or a filter membrane with a simple structure; compared with the used pore plates of a differential pressure flow meter, the flow meter provided by the invention mainly uses a dynamic venturi tube; the venturi tube has the advantages of small flowing resistance loss, long service life, high precision, and the tube is hard to block and the like. The flow meter provided by the invention is simple in structure, easiness in manufacturing, high in performance cost ratio, less in energy consumption for measurement, thus, the flow meter can be used for measuring the flow of small pipe diameter and dirty fluid, and has a development prospect for replacing differential pressure flow meters and partial small pipe diameter ultrasonic flow meters.

Description

technical field [0001] The invention relates to an instrument for realizing flow detection in the technical field of automatic detection, in particular to a throttling flow detection instrument. Background technique [0002] At present, flow measurement using the throttling principle is still the most widely used. Most of the throttling devices used are fixed throttling elements, and a small part are dynamic throttling elements. Among flowmeters made using the throttling principle, differential pressure flowmeters use fixed throttling elements, while target flowmeters and rotameters use dynamic throttling elements. Commonly used fixed throttling elements include orifice plates, nozzles and venturi tubes. They have a long history of use, complete test data, and standardized products, so they are also called "standard throttling devices". In the measurement, the orifice plate, nozzle and Venturi tube are fixedly installed in the pipeline, and the fluid flows through the throu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/36
Inventor 王可崇
Owner YANGZHOU HONGWEI MASCH EQUIP CO LTD
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