Micro-disturbing flow grating specially-shaped gas flow path for speed type ultrasonic meter

Abstract

The invention provides a micro-disturbing flow grating specially-shaped gas flow path for a speed type ultrasonic meter. The micro-disturbing flow grating specially-shaped gas flow path comprises a flow path body, a transducer gland, a transducer seat, a transducer, and a rubber gasket. A flattened double-elliptical intersecting structure is formed at the inner side of the flow path body. A plurality of metal rectiblocks are arranged in a flat and straight cavity of the middle part of the flow path body. The transducer gland has a hollow semi-spindle-body structure; and a plurality of transducer pressing columns are arranged inside the transducer gland. After the rubber gasket is installed by cooperating with the transducer, the transducer is compressed and fixed in the transducer seat tightly. A reserved hole having the size corresponding to that of a piezoelectric ceramic is formed in the piezoelectric ceramic side of the transducer to realize convenient ultrasonic access to the channel. A plurality of micro-disturbing flow gratings are arranged outside the transducer seat along the periphery uniformly; some gratings are arranged in a direction perpendicular to the circumferential tangential direction and certain angles are formed between the residual gratings and the central axis; and parts of micro-disturbing flow gratings outside the transducer seat are higher than other gratings to realize cooperative fixation with reserved channels formed in the openings at two ends of the flow path. According to the invention, with the specially designed micro-disturbing flow grating specially-shaped flow path, uniform gas field distribution is realized; and the gas can be rectified to be in a stable flowing state. The stabilizing effect is good and the application range is wide.

Description

technical field [0001] The invention belongs to the technical field of metering instruments, in particular to an ultrasonic measuring channel with rectification, which can be used for gas meters and flow meters for gas metering. Background technique [0002] Ultrasonic gas flowmeters generally use ordinary circular tubular flow channels. Through professional flow field analysis, it can be known that the flow velocity at the edge of the pipe is faster and the flow velocity at the center is slower, resulting in a large difference in the flow velocity of the ordinary circular flow channel on the cross section. The linear velocity at the center point represents the velocity of each point in the entire cross section, which will cause a large measurement error when measuring. [0003] Compared with various forms of ultrasonic measurement paths, the through-beam type is undoubtedly the installation method with the least attenuation and the largest receiving amplitude. Contents of...

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Problems solved by technology

[0002] Ultrasonic gas flowmeters generally use ordinary circular tubular flow channels. Through professional flow field analysis, it can be known that the flow velocity at the edge of the pipe is faster and the flow velocity at the center is slower, resulting in a large difference in the flow velocity of the ordinary circular flow channel on the cross section. The linear velocity at the center point represents the velocity of each point in the entire cross section, which will cause a large measurement error when measuring

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