Overall flowmeter

『Overall flowmeter』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)

1. What is the construction principle of a pointer scale flowmeter?

A pointer scale flowmeter is a direct reading mechanical flow meter that converts flow signals into mechanical angular displacement of the pointer through fluid mechanics, directly displaying instantaneous or cumulative flow. The key is the mechanical linkage between flow and pointer displacement.

1. Typical structural composition (1) Fluid sensing unit 1 Measurement chamber: a fluid flow channel integrated into the instrument housing, divided into a volumetric closed chamber or a velocity flow guide channel according to the instrument type, providing a stable measurement environment for the measured fluid. 2. Detection element: It is the core component of flow induction, and volumetric flow meters often use elliptical gears and waist wheel rotors, with fluid pushing the rotors to rotate alternately; Velocity flow meters often use turbine impellers and rotors, with fluid impact blades driving the rotor to rotate. The motion parameters of the rotor are directly positively correlated with the flow rate. 3. Sealing components: including a static seal for the housing and a dynamic seal for the detection element. The static seal uses gaskets or sealant to prevent medium leakage from the housing joints, while the dynamic seal uses sealing rings made of polytetrafluoroethylene and nitrile rubber materials to ensure no medium leakage and reduce frictional resistance during rotor rotation. （2） Mechanical transmission unit 1 Gear transmission group: Adjust the high-speed rotation of the rotor according to the preset transmission ratio, match the range of the dial, and transmit the rotation signal to the pointer component. Some instruments will be

equipped with a counter transmission structure for cumulative flow recording. 2. Limit structure: Limit the maximum rotation angle of the pointer to avoid exceeding the range operation, which may cause the transmission mechanism to jam, gear teeth or pointer to fall off. 3. Transmission connectors: including connecting rods, shafts, etc., used to transmit the rotation signal of the rotor to the pointer component without error. The small float type pointer flowmeter uses the linear displacement of the float to drive the connecting rod to convert it into pointer angular displacement. （3） Display unit 1 Scale dial: Made using printing or etching technology, printed with instantaneous flow scale and numerical identification corresponding to the range, some with mechanical counter windows for cumulative flow. Transparent protective glass is installed on the outside of the dial to prevent dust and oil pollution of the scale. 2. Pointer component: Made of lightweight aluminum alloy or engineering plastic material, linked with the transmission mechanism through a shaft, connecting rod, and rotor, it points to the corresponding scale value with the rotation of the rotor. Some pointers have a luminous coating for easy reading in low light environments.

II. Core Working Principle 1 After the fluid enters the measurement chamber, corresponding driving force is generated according to the instrument type: in a volumetric flowmeter, two rotors and the chamber form a fixed volume measuring chamber. After the fluid fills the measuring chamber, the rotor is pushed to rotate, and a fixed volume of fluid is discharged for each rotation. The cumulative number of rotations is proportional to the total flow rate; In a speed flowmeter,

1. What is the construction principle of a pointer scale flowmeter?

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