Unlined pipeline type necking electromagnetic water meter

Abstract

The invention discloses an unlined pipeline type necking electromagnetic water meter and relates to the technical field of measuring instruments. The unlined pipeline type necking electromagnetic water meter achieves the technical purposes that measuring errors are reduced and the reliability of measuring results is improved. The unlined pipeline type necking electromagnetic water meter comprises a measuring pipe, a water meter shell and two flanges. The unlined pipeline type necking electromagnetic water meter is characterized in that the water meter shell is fixedly provided with two diversion conical pipes, pipe openings in the two ends of the measuring pipe are coaxially in butt joint with pipe openings in the narrow ends of the two diversion conical pipes, and the pipe openings in the two ends of the measuring pipe and the pipe openings in the narrow ends of the two diversion conical pipes are fixed. The joint parts of the two ends of the measuring pipe are sealed and the two diversion conical pipes are sealed through sealing rings respectively. The two flanges are installed on the outer walls of the two diversion conical pipes respectively through clamp springs. The unlined pipeline type necking electromagnetic water meter is suitable for measuring the flow of media in pipelines.

Description

technical field [0001] The invention relates to the technology of measuring instruments, in particular to the technology of a liner-free pipeline necking electromagnetic water meter. Background technique [0002] The electromagnetic water meter is an instrument used to measure the flow of the medium in the pipeline. When it is used, it is connected to the flange of the pipeline under test to measure the flow of the medium in the pipeline under test. [0003] Electromagnetic water meters are usually used for closed full pipe flow measurement, such as Figure 4 As shown, the measuring tubes of traditional electromagnetic water meters are all straight tube double-layer structures, that is, the inner wall of the non-insulated tube body 21 is covered with a layer of insulating lining 22, and the insulating lining 22 is used to avoid eddy current loss during the measurement process, ensuring Measurement accuracy, the two ends of the pipe body 21 are respectively welded with flange...

AI Technical Summary

Problems solved by technology

[0004] 1) In the case of a certain pipe diameter, when the medium in the measured pipe is not full of the pipe, the medium in the measuring pipe is also not full of the pipe, which will lead to errors in the measurement results;

[0005] 2) The two flanges are directly welded on the measuring tube, and the two flanges will directly contact the measured medium, so the sealing surface of the flange is also covered with a layer of insulating lining, and the insulating lining on the flange surface is in the measurement The medium process is easily damaged by negative pressure and thermal shock, which will cause eddy current loss in the flange and affect the reliability of the measurement results;

[0006] 3) Once the insulating inner lining of the measuring tube is damaged during the process of measuring the medium, it is easy to cause eddy current loss in the measuring tube, thus affecting the reliability of the measurement results

Images