Crude oil flow metering device

A crude oil flow metering device, comprising:

• a measuring part, which comprises:
• a measuring tube comprising a liquid inlet and a liquid outlet, an inner diameter of the measuring tube gradually increasing from the liquid inlet to the liquid outlet;
• and
• a float assembly, which is in-built in the measuring tube and comprises a float and a float connection rod integrally connected with the float, an end of the float connection rod being connected to a detection part;
• and
• a metering part, which comprises:
• a position detection module, which is arranged in a detection cavity located above the measuring tube and formed by a first housing:
• in which when the detection part at the end of the float connection rod extends into the detection cavity, the position detection module detects a position of the detection part at the end of the float connection rod to obtain a float height detection signal;
• and
• a processing module, which is connected to the position detection module to calculate a flow rate of measured crude oil according to the float height detection signal,
• wherein the position detection module is a sensor array, and when the detection part at the end of the float connection rod moves un and down in the detection cavity, sensors in the sensor array output the float height detection signal when they detect the detection part,
• wherein the sensor array is composed of a plurality of Hall sensors, which are arranged into a first array in an up-and-down vertical movement direction of the float connection rod, and the detection part at the end of the float connection rod is a magnet, and
• wherein there are a plurality of the first arrays, which are arranged in a spirally ascending manner on an outer surface of the first sensor sleeve in the up-and-down movement direction of the float connection rod, the float connection rod moves up and down in the first sensor sleeve, and each of the sensors corresponds to a unique detection position.