Compressed-air Gun Thrust Piston Amplifies Ejection Pressure
Solution Overview
Problem
Compressed air guns for ejecting pasty to low-viscosity materials face limitations in generating effective ejection pressure due to the direct pressure acting on the cartridge piston, leading to potential leaks and reduced uniformity in material application, especially when working within narrow safety pressure limits.
Innovation Solution
An additional drive mechanism, comprising a thrust piston connected in series with the cartridge piston, increases the ejection pressure by amplifying the force exerted on the cartridge piston, allowing for higher viscosity materials to be processed efficiently without significantly increasing the working pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the pressure in the receiving space is increased to improve ejection pressure, then the ejection force on the cartridge piston increases, but the cartridge piston may show leaks and material ejection uniformity deteriorates
Solution Approach 1:
The patent introduces an intermediate piston as a mediator between the receiving space and the cartridge piston. This intermediate piston transfers the compressed air pressure to the cartridge piston while being contained within a strengthened intermediate space. The intermediate piston and its sealed intermediate space act as a buffer that prevents direct high-pressure contact between the receiving space and cartridge piston, thereby avoiding leaks and maintaining sealing reliability while still achieving high ejection force.
2Productivity
If the working pressure is increased to process higher viscosity materials faster, then productivity increases, but the cartridge may burst due to safety pressure limits
Solution Approach 1:
The patent segments the pressure system into two distinct parts: the receiving space and the intermediate space, each with different pressure levels. The intermediate space is equipped with a strengthened cylinder jacket capable of withstanding higher pressures. This segmentation allows the system to operate at higher pressures in the intermediate space to process high-viscosity materials quickly, while the receiving space maintains lower pressures to prevent cartridge bursting.
3Force
If the effective area on the cartridge piston is increased to generate higher ejection pressure, then the ejection force increases, but the device complexity increases due to additional components
Solution Approach 1:
The patent implements a nested structure where the intermediate piston and intermediate space are positioned within the existing receiving space and cartridge assembly. The intermediate piston fits within the receiving space, and the intermediate space is nested between the intermediate piston and the cartridge piston. This nesting approach allows the system to achieve higher ejection pressures without significantly increasing the overall device size or complexity, as the additional components are integrated into the existing structure.
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
The solution effectively doubles the ejection pressure, enabling faster processing of pasty materials with higher relative viscosity while maintaining safety within existing working pressure constraints, thereby enhancing the device's performance and preventing cartridge bursting.
Implementation Method 1
The feed force on the cartridge piston can be increased in that not only the receiving space but also the thrust chamber can be subjected to increased pressure, with the pressure on the side of the thrust piston opposite the thrust chamber being lower
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a compressed-air gun for ejecting pasty to highly viscous material, comprising an outer housing (1) which can be opened on at least one side and has a pressure-tight locating space (3) for a cartridge (4) containing the material, preferably comprising a handle (5) connected to the outer housing (1), comprising a compressed-air connection (6) for the locating space (3), the cartridge (4) to be used having a discharge tip (8) or the like at a front end face (7) and a cartridge piston (10) at the opposite end face (9), the locating space (3), when the cartridge (4) is inserted, also being sealed off at the discharge tip (8) passing through the end wall (2) of the outer housing (1), and it being possible, by pressurizing the locating space (3), for the cartridge piston (10) to be advanced in the cartridge (4) in the direction of the discharge tip (8), so that the material is ejected from the discharge tip (8). Provision is made for an additional compressed-air cylinder (13) having a thrust piston (14) displaceable therein in a sealed-off manner to be arranged on the outer housing (1), for the thrust piston (14) to form a thrust chamber (15) in the compressed-air cylinder (13) on the side remote from the locating space (3), which thrust chamber (15) is connected to or can be connected to the compressed-air connection (6), for the thrust piston (14), on the side facing the cartridge (4), to have a force-transmission element (16), in particular in the form of a piston rod, which enters the locating space (3) via a pressure-tight leadthrough (17) and, when the cartridge (4) is inserted, comes to bear against the cartridge piston (10) in a force-transmitting manner, and for the feed force at the cartridge piston (10) to be capable of being increased by virtue of the fact that increased pressure can be applied not only to the locating space (3) but also to the thrust chamber (15), a lower pressure, in particular ambient pressure, prevailing on the side of the thrust piston (14) opposite the thrust chamber (15).