Roots flowmeter | There are several types of gas meters available now

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1. What are the advantages and disadvantages of volumetric flow meters?

1. What are the advantages and disadvantages of volumetric flow meters? A volumetric flow meter is an instrument that directly accumulates flow based on the volume of the discharged fluid. It is widely used for measuring viscous media such as oil, and uses a fixed small volume to repeatedly measure the volume of fluid passing through the flow meter. According to different measuring components, volumetric flow meters can be divided into:

1. Double rotor flow meter. This is a main variety with multiple forms and specifications, and is commonly used for measuring various media such as liquids and gases.

2、 The flow measurement part of the elliptical gear flowmeter is mainly composed of two interlocking elliptical gears and their housing (measuring chamber).

3、 The waist wheel type volumetric flowmeter, also known as the Roots type volumetric flowmeter, works on the same principle and process as the elliptical gear type. The difference is that the waist wheel does not have teeth and does not directly mesh with each other for rotation. Instead, it is transmitted through a transmission gear set installed outside the housing.

4、 A fixed measuring chamber is formed between two adjacent scrapers, rotors, housing cavities, and upper and lower cover plates of a scraper flowmeter. The fluid drives the scraper and rotor to rotate, and the scraper extends and retracts radially along a special trajectory. For each rotation of the rotor, four (or six) measuring chamber volumes are discharged, which is the circulating volume. According to the non-contact between the scraper and the cavity wall, it can be divided into two t

5、 Piston flow meters are divided into two types: rotary piston flow meters and reciprocating piston flow meters. Rotary piston flow meters insert an annular piston into the housing of a two-layer cylindrical cylinder, forming a form in which the annular piston rotates inside the housing with the flow of liquid. It can be used for measuring oil and food products; The piston of the reciprocating piston flowmeter moves back and forth in the cylinder under the propulsion of the fluid, measuring the volumetric flow rate. This type is usually used in gas stations refueling machines.

6、 A disc flowmeter, also known as a nutation flowmeter, involves the nutation motion of a disc with a central ball rotating and swinging up and down within a measuring chamber.

7、 Rotary flowmeter, also known as wet gas meter, is used to measure the total amount of gas. The flowmeter housing contains about half of the sealing liquid (water or oil), and half of the rotating drum is immersed in the sealing liquid. Gas flows in to make it rotate, and its sealing form is leak free. It is mostly used in laboratories and is commonly used as a gauge or standard gauge for measuring value transmission.

2. What are the advantages and disadvantages of volumetric flow meters? As a mechanical flow meter, the characteristic of volumetric flow meters is that they have no requirements for front and rear straight pipelines and high measurement accuracy.

1. Advantages of volumetric flow meters

(1) High measurement accuracy.