Fluid transportation measuring device

Abstract

The invention discloses a fluid transportation measuring device, comprising a heat conducting frame, which is installed at the surface of the base, and provided with a pair of vertical brackets, wherein the brackets are provided with laterally opened buckle slots; a U-shaped sensing pipe, of which both ends in a horizontal middle part are respectively embedded in the buckle slots of two brackets and fixed to each other, wherein both ends of the bending part are respectively downwards crossed through the base in a sealing manner from the base surface, the horizontal middle part of the sensing oil is coiled with a sensing screw group; a pressing plate, which is installed at the base surface, and used or pressing the end part of a flat cable wire and fixing the end part on the base surface, wherein the flat cable wire is connected with a wiring head of the sensing screw group through a wiring terminal with an exposed end part; an outer cover, which is installed at the base surface, and used for covering the sensing pipe, the heat conducting frame and the pressing plate; the inner part of the outer cover is provided with a heat insulation type avoiding groove corresponding to appearances of the sensing pipe, the heat conducting frame, and the pressing plate. The fluid transportation measuring device can reduce the null shift, improve the anti-disturbing ability, reduce the sensitivity to the installing position, and realize the fluid transportation measurement with high precision and high response.

Description

technical field [0001] The present invention relates to the technical field of fluid measurement, and more particularly, to a fluid delivery measurement device. Background technique [0002] There are many types of measuring devices used to measure fluid flow, usually including volume flow and mass flow. Volume flow measurement is often affected by changes in working conditions such as temperature and pressure, and the measurement accuracy is affected. Therefore, in the occasions requiring precise metering, it is generally required to use a mass flow measurement device. In addition, according to the contact between the fluid and the device, it can be divided into two types: contact type and non-contact type. [0003] At present, the non-contact type is widely used in the industrial field because of its wide adaptability to the medium. Therefore, non-contact fluid mass flow measurement devices have important applications in scientific research and production in various fie...

AI Technical Summary

Problems solved by technology

However, even this small movement can have a fatal effect on the sensor, resulting in uneven heat distribution inside the sensor, making the sensor zero drift

[0007] 2) Although the copper bracket (5) and the sensing tube are connected by welding, the welding point is located at the U-shaped bending part of the sensing tube, and the distance between the winding in the middle of the sensing tube is too far, causing the sensing The temperature equilibration time between the upstream and downstream of the pipe is longer, resulting in a longer response time of the sensor

[0008] 3) The copper support (5) is fixed on the outer cover of the sensor by gluing, so that the glued place has an adverse effect on the heat conduction of the copper support (5); since the temperature of the outer cover of the sensor is easily affected by the ambient temperature, this This effect will be transmitted to the copper bracket (5), thereby affecting the temperature between the upstream and downstream of the sensing tube, making the sensor weak in resisting ambient temperature changes

[0009] 4) Although a semicircular groove is processed on the outer cover, and the sensor tube is located in the groove; however, from the actual operation point of view, it is difficult to ensure that the sensor tube is located in the middle of the groove

Since the small semi-circular groove is used, as long as the sensor tube deviates a little from the middle position of the groove, it will have a great impact on the performance of the sensor, resulting in a decrease in the pass rate of the sensor

[0010] 5) The flat cable is also fixed on the copper bracket (5) by gluing; since the flat cable needs to be connected to the external circuit board, when the flat cable is swung, the glued part often becomes loose, cause the sensor to be scrapped

[0011] Therefore, the above-mentioned existing fluid delivery measuring device has a complex internal structure, a large volume, a complicated manufacturing process, and high manufacturing costs.

In actual use, it is prone to shortcomings such as large zero drift, poor anti-interference ability, sensitivity to installation position, poor repeatability, and long response time.

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