[The latest patent of the instrument] a differential pressure flow meter

Today we introduce a national utility model patent - a differential pressure flow meter.
The invention relates to the technical field of flow measurement, in particular to a differential pressure flow meter.

Background of the invention

At present, flow measurement technology plays an indispensable role in industrial production, energy measurement, environmental protection and other fields, and is closely related to national economy and scientific research. The flow meter has a differential pressure flow meter, a rotameter, and the like. Among them, the differential pressure flowmeter is a meter that measures the flow rate according to the differential pressure generated at different points of the flow detecting member installed in the pipeline, the known fluid condition, and the geometrical dimensions of the detecting member and the pipe.

Patent No. CN103424149A, discloses an olive-shaped differential pressure flowmeter. The differential pressure flowmeter in the patent has a complicated structure and is difficult to install; the positive pressure is small, the pressure difference is small, and the sensitivity is not high enough. The throttling element has a complicated structure and is not suitable for processing.

In addition, the existing flowmeters are mostly made of metal and are easily corroded. Therefore, in view of the above deficiencies, it is necessary to improve the design of the existing flowmeter.

Summary of the invention

The technical problem to be solved by the invention is to provide a differential pressure type flowmeter to solve the complicated structure of the existing differential pressure type flowmeter, the change of the measured pressure difference is small, the sensitivity is not high enough, the throttling element is not easy to be processed and installed, and the flowmeter is easy Corrosion problem.

Schematic diagram of a differential pressure flowmeter according to the first embodiment
In order to solve the above technical problem, the present invention provides a differential pressure type flowmeter including a measuring tube, a throttling element disposed in the measuring tube, having a fitting surface adapted to the inner wall of the measuring tube, and being separated and passed through The first pressure collecting pipe and the second pressure collecting pipe extending into one side of the measuring tube into the measuring tube cavity are convenient for pressure collection, and a large stable pressure difference in the measuring tube can be obtained, so that the flow meter has higher Response sensitivity and accuracy.

Preferably, the throttling element is a cylinder that forms a narrow channel with the inner wall of the measuring tube. The first pressure collecting tube extends outside the wall perpendicular to the fitting side tube wall of the measuring tube after being bent in the measuring tube cavity. The first pressure collecting pipe and the second pressure collecting pipe are respectively disposed at two sides of the throttle element, and an inlet pipe axis of the first pressure collecting pipe is parallel to an axis of the measuring pipe.

The second pressure collecting pipe is in close contact with the radial end surface of one side of the throttle element. The second pressure collecting pipe passes through the throttle element, and the inlet port is located on a side surface of the throttle element. The pipe of the second pressure collecting pipe on the throttle element is perpendicular to the wall of the measuring pipe. The measuring tube, the throttling element, the first pressure collecting tube and the second pressure collecting tube are made of quartz glass, ceramic or plastic material having high temperature resistance, high pressure resistance and corrosion resistance.

The above technical solution of the present invention has the following advantages: the throttling element has a fitting surface adapted to the wall of the measuring tube, which can both block the fluid and have a guiding effect, and the relationship between the throttling element and the measuring tube The two form a stable positional relationship without additional flow guiding and fixing device; the first pressure collecting tube and the second pressure collecting tube extend into the measuring tube cavity, and a large stable pressure difference in the measuring tube can be obtained. The differential pressure type flowmeter of the invention has the advantages of simple structure, easy processing and molding, convenient installation, low cost and wide application range.

In a preferred embodiment of the invention, the throttling element is a cylinder that forms a narrow channel with the inner wall of the measuring tube, which both obstructs the fluid and creates a throttling effect, while the throttling element in the form of a cylinder facilitates the machining installation.

In another preferred embodiment of the present invention, the first pressure collecting pipe and the second pressure collecting pipe are respectively disposed at two sides of the throttle element, and the inlet pipe axis of the first pressure collecting pipe is parallel to the axis of the measuring pipe, so that The fluid flow direction is perpendicular to the pressure tapping nozzle, and the position setting is reasonable and effective, which is convenient for pressure collection, and the shortest distance reduces the pressure loss of the pipe wall.

In still another preferred embodiment of the present invention, the second pressure collecting pipe is in close contact with the radial end surface on one side of the throttle element, and a stable maximum pressure difference can be obtained. In a further preferred embodiment of the invention, the second pressure collecting tube passes through the throttling element, the inlet opening of which is situated on the side surface of the throttling element, as well as a stable maximum differential pressure.

In a preferred embodiment of the present invention, the first pressure collecting tube and the second pressure collecting tube are arranged perpendicularly to the measuring tube wall, and the setting method is simple and effective, and the maximum pressure difference between the upstream and the downstream of the throttle element can be obtained, so that the flow meter has a higher height. Sensitivity and accuracy. In another preferred embodiment of the present invention, the flowmeter is made of quartz glass, ceramic or plastic material resistant to high temperature, pressure and corrosion, and can be applied in special environments such as high temperature, acid and alkali, and the application range of the instrument is expanded. .

For further information, please download the full specification of the patent.

Huaheng Instrument

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