Sonic nozzle

Abstract

The invention relates to a sonic nozzle. The sonic nozzle comprises a body; the body is of a middle-through mechanism, an inner cavity of the body is in a spindle shape, and the inner cavity comprisesa gas inlet cavity and a gas outlet cavity which communicate with each other through a gas channel; the inner diameter of the gas channel is less than that of the gas inlet cavity and the gas outletcavity; a diameter adjusting assembly is arranged on the side wall of the gas channel; the diameter adjusting assembly comprises an adjusting protruding block and an adjusting rod for driving the adjusting protruding block; the adjusting protruding block is arranged in a movable cavity in the side wall of the gas channel and can move in the movable cavity, and a sealing piece is arranged between the adjusting protruding block and the side wall of the movable cavity; and the adjusting rod is connected to the inner wall of a driving cavity of the adjusting protruding block through a lead screw at the end, and the moving direction of the adjusting protruding block is perpendicular to the central axis of the body. The sonic nozzle has the beneficial effects that measurement is more precise, gas directly impacts a scattering assembly to realize pressure measurement, the speed in the gas flow direction can be better reflected, and thus a flow value is obtained more precisely by combining theinner diameter.

Description

technical field [0001] The invention belongs to the technical field of nozzles, in particular to a sonic nozzle. Background technique [0002] The sonic nozzle is a channel that gradually shrinks and expands. When the airflow passes through the tapering section, the speed increases and the pressure decreases. The sound velocity reaches the critical airflow at the smallest cross-section, and then the velocity kinetic energy is converted into pressure energy through the gradual expansion section, so that the pressure can be restored. . [0003] In many occasions in metallurgy, chemical industry and pneumatic industries, it is necessary to control and adjust the gas flow. The adjustment of gas flow is very important for automatic control. Therefore, regulating valves are widely used in industry. For the gas flow regulating valve, there are many researches at home and abroad, and the technology is relatively mature. [0004] Although the existing nozzles can also realize the...

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Problems solved by technology

[0004] Although the existing nozzles can also realize the adjustment of the gas flow rate, they generally install sensors on the side wall of the cavity to calculate the gas flow rate by monitoring the air pressure in the air cavity and then matching the inner diameter of the gas cavity. Although this method is more Facilitate the manufacture of equipment, but its accuracy will be affected to a certain extent;

[0005] To a certain extent, because the air cavity is not a completely sealed environment, and because the gas has been flowing rapidly, the air pressure sensor on the inner wall of the air cavity cannot respond to the air pressure well.

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