Roots Pump Connecting Channels in Intermediate Walls
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Solution Overview
Problem
Roots pumps have a complex and costly design due to large housing volumes required for connecting channels, leading to high external dimensions and material usage, which complicates manufacturing and increases costs.
Innovation Solution
The Roots pump design features multi-tooth rotary piston pairs with connecting channels arranged in intermediate walls, reducing external dimensions and material usage, and allowing for simpler production of straight or circular-cylindrical channels, eliminating the need for curved channels outside the piston chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If connecting channels are arranged radially outside the piston chambers, then gas can be conveyed between pump stages, but the housing volume and external dimensions become large
Solution Approach 1:
The connecting channels are relocated from a radial arrangement outside the piston chambers to an axial arrangement within the intermediate partitions. This dimensional change allows the channels to be integrated into the partition structure, significantly reducing the housing volume and external dimensions while simplifying the manufacturing process by eliminating complex curved channel geometries.
2Quantity of substance
If connecting channels are arranged in the housing surrounding pump chambers, then gas transport between stages is achieved, but the amount of metal used increases
Solution Approach 1:
The connecting channels are merged with the intermediate partitions that separate adjacent pump stages. Instead of being separate components arranged in the housing, the channels are now integral parts of the partition structure. This merging reduces the total amount of metal required while simultaneously simplifying the design by eliminating complex curved channel geometries.
3Ease of manufacture
If curved connecting channels are provided radially outside piston chambers, then gas can be conveyed between stages, but production becomes technically difficult
Solution Approach 1:
The channel geometry is changed from curved radial channels to straight axial channels by relocating them to the intermediate partitions. This dimensional change transforms the complex curved geometry into simple straight or circular-cylindrical channels that can be easily produced using standard drilling or boring operations, significantly simplifying the manufacturing process.
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 design results in a more compact, cost-effective, and lightweight pump with reduced pressure losses and lower maintenance requirements, as well as reduced power consumption and equalized load peaks and heat of compression.
Implementation Method 1
The two rotary pistons are driven in opposite directions, so that gas is sucked in through the individual chambers created through a main inlet and expelled again through a main outlet
Implementation Method 2
the connecting channels can be arranged in the housing of the Roots pump, the connecting channels surrounding the pump chambers in which the rotary pistons are arranged or being arranged radially outside the pump chambers
Implementation Method 3
the connecting channels are arranged in intermediate walls which separate adjacent pump stages from one another
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A Roots pump has a plurality of multiple-tooth rotary piston pairs (10, 48, 49) which form in each case one pump stage (50, 52, 54, 56, 58, 60). Adjacent pump stages (50, 52, 54, 56, 58, 60) are connected to one another via connecting ducts (30, 34, 77, 84, 86, 88, 90). In order to reduce the production costs, it is provided according to the invention to arrange the connecting ducts (30, 34, 77, 84, 86, 88, 90) in intermediate walls (74, 76, 78, 80, 82) which separate adjacent pump stages (50, 52, 54, 56, 58, 60) from one another.