Venturi Powder Pump Assembly for Stable Gas Flow Alignment
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Solution Overview
Problem
Existing Venturi powder pumps suffer from performance variability due to imprecise positioning and assembly of the injector and ejector components, leading to inefficiencies and potential clogging, particularly when the drive gas flow is turbulent and misaligned.
Innovation Solution
The injector and ejector are positioned parallel and straight within the pump body, with indexing means ensuring precise alignment and a cone-on-cone interface for stable gas flow, and a sleeve for dilution air circulation, minimizing pressure drops and clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the injector and ejector are mounted in the pump body with separate housings, then the assembly can be manufactured with standard machining processes, but the positioning precision and coaxiality between injector and ejector deteriorate due to accumulation of machining and assembly errors
Solution Approach 1:
The patent merges the injector and ejector into a single integrated assembly where the injector is mounted directly on the ejector body. This eliminates the intermediate pump body housing and its associated machining tolerances, directly achieving the desired positioning precision and coaxiality between the two components while reducing overall assembly complexity.
2Productivity
If the drive gas flow turns 90° before injection into the ejector, then the injector can be supplied from the side, but the gas flow becomes turbulent and suction efficiency deteriorates
Solution Approach 1:
Instead of supplying drive gas from the side with a 90° turn, the patent inverts the approach by supplying drive gas axially through the injector directly into the ejector. This eliminates the turbulent 90° turn and creates stable, laminar gas flow that significantly improves suction efficiency and overall pump performance.
3Adaptability or versatility
If the injector-ejector assembly turns about the longitudinal axis within the pump body, then some alignment flexibility is achieved, but misalignment between injector outlet and ejector inlet occurs
Solution Approach 1:
By merging the injector and ejector into a single rigid assembly, the patent eliminates the problem of rotational misalignment entirely. The fixed relative positioning between injector and ejector ensures precise alignment of the injector outlet with the ejector inlet, while the entire assembly can still be oriented as needed in the pump body.
4Device complexity
If the suction chamber is built directly into the pump body, then the structure is compact, but the risk of clogging increases and cleaning becomes difficult
Solution Approach 1:
The patent extracts the suction chamber function from the pump body by positioning the ejector inlet directly at the reservoir opening. This eliminates the enclosed suction chamber that is difficult to clean, while maintaining structural compactness through the direct connection between the ejector and reservoir.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration stabilizes the drive gas flow, enhances efficiency by reducing turbulence, and minimizes clogging, ensuring consistent performance and ease of maintenance.
Implementation Method 1
The injector is designed to inject drive gas at high velocity into a suction chamber of a pump casing where it expands. The expansion of the drive gas generates a vacuum in the suction chamber
Implementation Method 2
the coating preferably being fluidised by the addition of a fluidising gas, by means of a porous plate located at the bottom of the reservoir
Data Source
AI summary
The present invention relates to a Venturi powder gun comprising a body, an injector of drive gas and an ejector of a mixture comprising the powder product, mounted in the body. The body defines a duct for circulating the mixture, upstream of the ejector. The injector and the ejector are straight and extend respectively along an injector axis and an ejector axis, which coincide when the powder pump is in the assembled configuration. Means for indexing the position of the ejector within the pump body, in rotation about the ejector axis, make it possible to align an inlet of a suction chamber with the mixture circulation duct defined by the pump body.