Low Pressure Pump with Interacting Cycloidal Combs
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Solution Overview
Problem
Existing rotary piston pumps for gaseous media are expensive to produce, especially in large series, and struggle to efficiently cover a wide pressure range, including low pressures (vacuum) while maintaining high tightness and pumping power.
Innovation Solution
A 2-stage rotary piston pump design where the first power part is directly driven by an electric motor, and the second power unit is carried via a clutch, with elastic means like helical springs for tightness and a plug-in coupling for axial movement, allowing for economical manufacturing and assembly, and connecting the pumps in series for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two power parts are connected in parallel via a common ring to increase pumping power, then the conveying capacity increases, but the production cost increases significantly
Solution Approach 1:
The patent combines two power parts and two shut-off parts into a single integrated pump unit with a common drive shaft, eliminating the need for separate pump housings and drive mechanisms. This merging approach achieves the desired increased pumping capacity while significantly reducing production costs through unified manufacturing and assembly processes
Solution Approach 2:
The common ring serves multiple functions: it acts as a structural support element, a synchronization mechanism for the two power parts, and a mounting platform for the shut-off parts. This multi-functionality reduces the total number of components needed and simplifies the overall pump structure
2Reliability
If elastic means are used to press tooth combs onto shut-off parts for tightness, then sealing performance improves, but the device complexity increases
Solution Approach 1:
The patent uses elastic means (springs) to apply continuous axial force on the tooth combs, maintaining optimal contact pressure between the tooth combs and shut-off parts throughout operation. This dynamic parameter adjustment ensures consistent sealing performance under varying operating conditions without requiring complex adjustment mechanisms
Solution Approach 2:
The elastic means automatically compensate for wear and dimensional variations in the tooth combs and shut-off parts by adjusting the contact pressure as needed. The spring-loaded system self-regulates to maintain tight sealing without requiring external adjustment or monitoring systems
3Adaptability or versatility
If a 2-stage pump design is used to cover a larger pressure range, then the pressure range increases, but the manufacturing complexity increases
Solution Approach 1:
The pump is divided into two distinct stages, each with its own power part and shut-off part, allowing each stage to be optimized for specific pressure ranges. The first stage handles higher pressure differential while the second stage handles lower pressure differential, enabling the pump to cover a broad pressure range from atmospheric to vacuum conditions through modular design
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 design achieves a larger pressure range, including low pressures, with improved manufacturing efficiency and simplified service, while maintaining high pumping capacity and tightness, suitable for applications like vacuum pumps in brake boosters.
Implementation Method 1
elastic means, loading them in the direction of the shut-off parts, with a helical spring arranged coaxially with the power parts serving as the elastic means
Implementation Method 2
the first power part is driven by the rotating part of the electric motor
Data Source
Figure 1~3
AI summary
The invention relates to a low pressure pump/vacuum pump for gaseous media, comprising two interacting combs the teeth of which are configured as cycloidal components, the duplicate compressor stages being interconnected. A power unit of the pumps/compressors is driven and the power unit of the other pump/compressor, which is arranged coaxially, is entrained via a rotational connection.