The venturi nozzle consists of three parts: shrinkage section, throat (narrow diameter section), and diffusion section.  When the fluid passes through, it goes through the process of  "acceleration-depressurization-re-deceleration-pressure recovery":

◇ In the throat, the flow rate reaches its peak and the static pressure is minimized, resulting in a significant negative pressure effect (suction).

◇ In the diffusion section, the flow rate decreases and the pressure is partially restored.

Venturi effect structure diagram

The characteristics of this structure are obvious:

 ◇ High efficiency: The pressure loss is much lower than that of other flow control devices.

 ◇ Strong self-priming and mixing ability: can draw in and mix the second phase fluid without external power.

 ◇ Stable operation: no moving parts, very low maintenance cost.

 ◇ Complex structure and difficult to form: traditional drilling and milling cannot construct smooth shrinkage-diffusion transition surfaces at the micron scale.

 ◇ Rough inner cavity, affecting the flow state: machining is easy to produce burrs, knife patterns, and recasting layers, which destroys the hydrodynamic properties.

 ◇ Difficult to assemble and seal: There is a risk of micro-leakage in the multi-component splicing structure, which affects the vacuum degree and pressure stability.

 ◇ Material restrictions: cemented carbide, ceramics and other high-hardness materials are easy to crack and chip.

In the face of the above challenges, Yueqian Laser uses advanced ultrafast laser micromachining technology to realize the integrated molding of micro venturi nozzles. Complex micron-scale cavities are constructed directly inside stainless steel, ceramics, or carbide by laser.

It not only ensures a smooth transition from the shrinkage section to the diffusion section, but also achieves a surface finish to the mirror level. This integrated processing method completely eliminates the risk of leakage, allowing the nozzle to maintain precise dynamic characteristics on a small scale.

With  its leading ultrafast laser micromachining technology, Yueqian Laser  breaks through the processing bottleneck of micro-venturi structures,  extends the application boundary of this classic fluid dynamic structure  from macroscopic pipelines to microscopic precision components, and  realizes "if there is a venturi structure demand, there is Yueqian laser technology empowerment":

◇Industrial environmental protection: smooth  runners improve the efficiency of water treatment gas-liquid mixing;  Integrated molding ensures the stable suction of coatings and abrasives  in the painting and sandblasting processes.

◇Energy and metering: The  mirror inner wall and precise curved surface are constructed to ensure  the stability of the differential pressure of high-pressure fluids in a  wide flow range, which has become the cornerstone of reliable  measurement of natural gas and steam.

◇ Aviation and power: Used for engine fuel injection system and cockpit pressure adjustment to ensure precise control in complex environments.

◇ Microfluidics: Realize  the miniaturization and integration of venturis, and accurately control  trace fluids in medical dosing, inkjet printing and semiconductor  cleaning.