Extruded Air Pump Compression Chamber Unit Design
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Solution Overview
Problem
The existing die casting process for producing compression chamber units in air pumps lacks accuracy in forming units of the same volume with a smooth surface, leading to increased friction, uneven material distribution, and the need for sealing rings which are prone to defects due to temperature changes.
Innovation Solution
The compression chamber unit is created using an extruded cylindrical body part with a cap that engages without a sealing ring, featuring heat-dissipating ribs and a method where the cylindrical body part is extruded and the cap is moulded onto it, ensuring air-tightness and identical volume production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If die casting process is used to form compression chamber units, then production efficiency is improved, but manufacturing precision deteriorates due to inability to produce units of same volume with smooth surface
Solution Approach 1:
The compression chamber unit is divided into two separate components: an extruded cylindrical body part and a moulded cap. The cylindrical body part is produced by extrusion process which ensures consistent volume and smooth surface, while the cap is produced separately by moulding process. This segmentation allows each component to be manufactured with optimal precision for its specific requirements.
Solution Approach 2:
The cap is extracted as a separate component from the integrated die-casted unit. The cap includes the outlet nozzle, connecting flanges, and connecting bosses, which are moulded separately and then attached to the extruded cylindrical body part. This extraction allows the main compression chamber to be produced with high precision extrusion while the cap handles functions requiring moulding.
2Productivity
If die casting process is used, then production speed is improved, but material distribution becomes uneven due to suction in material
Solution Approach 1:
The production process is segmented into two separate manufacturing operations: extrusion for the cylindrical body part and moulding for the cap. The extrusion process inherently provides uniform material distribution through its continuous forming mechanism, eliminating the suction-related defects that plague die casting of the entire unit.
3Ease of operation
If sealing ring is used to ensure air-tight compression chamber unit, then ease of assembly is improved, but reliability deteriorates due to wear and tear and volume changes from temperature differences
Solution Approach 1:
The cap and cylindrical body part are designed with complementary engagement features (protrusions and recesses) that merge the two components into a unified air-tight structure. This direct mechanical engagement eliminates the need for separate sealing rings, creating a more reliable air-tight connection that is resistant to wear and temperature-induced volume changes.
Solution Approach 2:
The sealing ring is extracted from the design, removing the component that causes reliability issues. Instead of using a separate sealing ring that is prone to wear and thermal expansion, the air-tightness is achieved through the precise geometric fit between the cap and cylindrical body part engagement features.
4Ease of operation
If polishing is performed to reduce friction, then ease of operation is improved, but energy consumption increases and heat development increases
Solution Approach 1:
The smooth surface is created during the extrusion process itself through preliminary action, rather than requiring subsequent polishing operations. The extrusion die produces the cylindrical body part with an inherently smooth surface finish, eliminating the need for additional energy-consuming polishing steps and reducing overall heat development in the system.
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 approach results in compression chamber units with consistent volume and reduced friction, minimizing energy consumption and the risk of defects, while allowing for efficient heat dissipation and eliminating the need for sealing rings.
Implementation Method 1
the cylindrical body part is an extruded cylinder
Implementation Method 2
allowing heat dissipation from the exposed parts of the cylindrical body part
Data Source
AI summary
The present invention relates to a compression chamber unit (1) of an air pump, comprising a cylindrical body part (3) provided with at least one outlet nozzle (4), a number of connecting flanges (6) and a number of connecting bosses (7), wherein the cylindrical body part (3) is an extruded cylinder and a cap (2) is formed with outlet nozzle (4), connecting flanges (6) and connecting bosses (7), where the cap (2) is adapted to engage with a first end part (10) of the cylindrical body part (3). The present invention further more relates to a method for forming a compression chamber unit (1) which method comprises the following steps:the cylindrical body part (3) is extruded, andthe cap (2) is moulded onto the cylindrical body part (3).