High-pressure dynamic internal gear flowmeter

Abstract

The invention discloses a high-temperature dynamic internal gear flowmeter. An internal gear and a shell are fixed together, and the number of small pinions can be 2 to 4. Three pinions are taken as instance for description as follows: a liquid to be measured passes through a pintle valve and a retainer through an oil inlet to enter three oil inlet cavities of the internal gear; the three pinions and the retainer are pushed to move so as to bring the oil into three oil outlet cavities of the internal gear; the oil passes through the retainer and the pintle valve to reach an oil outlet; a flow rate signal of the liquid to be measured is converted to a rotating speed signal of the retainer, and the rotating speed signal is converted to an electric signal by a rotary transducer; and the dynamic flow rate of a system to be measured is determined by the measured electric signal finally. The pinions and the retainer are made of light wear resistant materials and have small moment of inertia; the tooth number of the internal gear is a non-three interger multiple, and the flow rate realizes dislocation and superposition; the flow pulsation of the flowmeter is very small, and the flow quality is obviously improved; and because the flowmeter belongs to a volumetric flowmeter, the flowmeter is not influenced by testing environmental conditions, can accurately measure the high-pressure flow rate of a hydraulic system, has the advantages of wide measuring range, high precision, good reliability and the like, and can be widely used for measuring the flow rate of high-pressure hydraulic systems in the industries such as chemical engineering, coal mine, metallurgy and the like.

Description

technical field [0001] The high-pressure dynamic internal gear flowmeter is suitable for systems that use mineral oil, emulsion or water as the working medium. It is a high-pressure flowmeter that can reliably measure the flow of high-pressure hydraulic systems. It belongs to the field of dynamic flow testing of fluid transmission. Background technique [0002] For the flow measurement of high-pressure hydraulic systems, there are no products that have been formed in China at present. Only in the laboratories of some research institutions and colleges, the flow can be accurately measured by indirect flow measurement under laboratory conditions. However, if the experiment If conditions change, such as fluid viscosity, temperature, flow velocity, pulsation, pressure, flow state, etc., it is difficult to accurately measure the flow rate of the high-pressure hydraulic system. A flow meter is a meter whose performance is strongly dependent on the conditions of use. Flowmeters ar...

AI Technical Summary

Problems solved by technology

Flowmeters are one of the few instruments that are much more difficult to use than to manufacture. In the laboratory they can be extremely accurate, but in the field, once conditions change, it is all for naught.

Invention patent JP2306122 "Positive displacement flowmeter" and invention patent 200610049716.6 "High pressure bidirectional oval gear flowmeter" are both based on oval gears as the research object. There is no flow pulsation that the oval gear flowmeter itself may bring to the measured system. Considering that it is difficult to measure high-pressure dynamic flow

The new utility patent ZL200620006026.8 "balanced multi-gear high-pressure dynamic flowmeter" is difficult to use because of its complex structure, many rotating parts, large moment of inertia, and the participation of external meshing gear pairs. For the measurement of dynamic flow in hydraulic systems

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