Rolling positioning type high-accuracy metal tube floater flow meter

Abstract

The invention discloses a rolling positioning type high-accuracy metal tube floater flow meter. The rolling positioning type high-accuracy metal tube floater flow meter comprises a measurement tube and a floater, wherein the axis of the measurement tube coincides with the axis of the floater. A disc is arranged on the floater. The diameter of the disc is larger than those of other portions of the floater. The floater is positioned in the center of the measurement tube through a positioning device connected with the inner wall of the measurement tube and can freely move up and down. The disc is arranged at the lower end of the floater. The outer surface of the lower end of the disc is in an arc shape. The positioning device comprises two positioning units which are arranged up and down and are identical in structure. Each positioning device comprises three positioning posts fixedly connected with the inner wall of the measurement tube. Every three positioning posts are located on the same horizontal plane and the included angle between every two adjacent positioning posts is 120 degrees. The end, close to the axis of the measurement tube, of each positioning post is provided with a ball. The upper portion of the floater is clamped and limited by every three balls and the floater can be made to freely move up and down but cannot move horizontally. Due to the fact that the positioning device is located on the upper portion, flowing of fluid is not influenced, and the measurement accuracy is remarkably increased.

Description

Technical field [0001] The invention belongs to the field of flow meters, and particularly relates to a rolling positioning type high-precision metal tube float flowmeter. Background technique [0002] The metal tube float flowmeter uses the function of fluid to make the float move upwards downstream in the vertically installed measuring tube. The displacement of the float is proportional to the flow. Through the magnetic transmission system, the float displacement indicator directly indicates the flow in a non-contact manner. It has simple structure, convenient maintenance, single-axis or dual-axis drive pointer, reliability High, wide applicability, can be used to measure the flow of liquid, gas and steam. [0003] The float in the metal tube float flowmeter must be coaxial with the measuring tube to ensure accurate measurement. Therefore, a positioning device is installed in the measuring tube to position the float at the center of the measuring tube and allow it to move up and...

AI Technical Summary

Problems solved by technology

[0004] The defect of the above-mentioned traditional metal tube float flowmeter is that when the fluid passes through the positioning body, the flow direction will inevitably change to a certain extent, and this change will change the pressure distribution of the fluid on the float disc to a certain extent, making it difficult to be subjected to an absolute upward force. pressure, thereby reducing the measurement accuracy; in addition, because the positioning body at the lower end offsets part of the fluid pressure, the fluid is reduced relative to its original pressure, which will also lead to a decrease in its measurement accuracy, and will increase the minimum measurement value of the fluid flow. For low pressure Fluid flow measurement will be subject to certain restrictions

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