Multi-rotor Pump with Truncated Hemisphere Housing
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Solution Overview
Problem
Existing rotary piston machines face challenges in manufacturing a housing with an easy-to-produce interior and sealing issues due to divided housing designs, which can lead to rotor damage and efficiency losses when handling high-speed operations with non-lubricating media.
Innovation Solution
A rotary piston machine design featuring a rotor, intermediate rotor, and counter-rotor with specific toothing configurations and axes orientations, allowing for a one-piece housing with a truncated hemisphere interior, eliminating the need for a divided housing and enabling precise gap maintenance to prevent contact and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the housing is divided into multiple parts with separate center points, then assembly and sealing become complex, but manufacturing precision and alignment accuracy deteriorate
Solution Approach 1:
The housing is designed as a single integrated piece rather than divided into multiple parts. This merging eliminates the complexity of assembling separate housing parts and ensures that the spherical interior surface and rotor mounting locations are precisely aligned from the outset, resolving the contradiction between ease of manufacture and manufacturing precision.
Solution Approach 2:
The housing is designed with a spherical interior that provides uniform geometric conditions for mounting the rotor and counter-rotor. This equipotential spherical geometry ensures that center points coincide naturally without requiring complex alignment procedures, achieving both manufacturing simplicity and precision.
2Ease of manufacture
If the housing is divided with separating surfaces, then sealing technology becomes complex, but rotor assembly and gap control become difficult
Solution Approach 1:
By merging the housing into a single piece, the patent eliminates separating surfaces that would require sealing technology. This unified housing structure provides a reliable environment for rotor assembly and maintains consistent gaps without the leakage risks associated with divided housings and sealing interfaces.
3Productivity
If gaps between rotors and inner wall are reduced to minimize leakage, then efficiency improves, but contact and damage risks increase
Solution Approach 1:
The housing incorporates a spherical interior surface that perfectly matches the curved outer contours of the rotor and counter-rotor. This spherical geometry creates uniform, optimized gaps throughout the rotation cycle, minimizing leakage while preventing localized contact and damage that would occur with flat or irregular surfaces.
Solution Approach 2:
The patent optimizes the gap parameter by designing the spherical interior surface with precise radius dimensions that match the rotor outer contours. This parameter optimization ensures minimal but safe gaps that prevent leakage while avoiding contact, balancing efficiency and reliability.
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 enhances manufacturing simplicity, prevents rotor damage, maintains efficiency by minimizing gaps, and allows for high-throughput medium transport, with the option for multi-stage and multi-flow operations, and can function as a transmission or motor.
Implementation Method 1
ridges of teeth of a rotating drive part run on a cycloid surface of a likewise toothed driven part to delimit working spaces and thereby drive this driven part. Between the teeth of the drive part and the driven part, the working spaces mentioned are formed, which are enlarged or reduced during the rotation of the parts for their work in order to generate the conveying effect on a gaseous or liquid medium.
Implementation Method 2
the housing is divided such that the parting plane contains the center point of the spherical interior space, resulting in a first housing part having a hemispherical interior space with a first center point and a second housing part having a hemispherical interior space and a second center point. As a result, particular attention should be paid to the design of the separating surfaces of the two housing parts in such a way that the first and second center points of the spherical interiors of the housing parts coincide in the assembled state.
Data Source
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AI summary
The invention relates to a rotary piston machine which operates as a pump, as a compressor or as a motor and which has a rotor (8), an intermediate rotor (6) and a counter rotor (4), wherein the intermediate rotor (6) is arranged between the rotor (8) and the counter rotor (4). The counter rotor (4) has a first end surface (12) with a first toothing (14). The intermediate rotor (6) has a second end surface (16) with a second toothing (18) and a third end surface (20) with a third toothing (22). The rotor (8) has a fourth end surface (24) with a fourth toothing (26). Each toothing (14, 18, 22, 26) is formed from at least one tooth (15, 19, 23, 27) and one tooth space (10). The toothings (14, 18, 22, 26) engage with one another such that first working chambers (28) are formed by meshing of the teeth (15) of the first toothing (14) with the teeth (19) of the second toothing (18) and such that second working chambers (30) are formed by meshing of the teeth (23) of the third toothing (22) with the teeth (27) of the fourth toothing (26), wherein volumes formed by the first (28) and second working chambers (30) are varied by the meshing of the teeth (15, 19, 23, 27). The rotors (4, 6, 8) are rotatably guided in a housing (32) which accommodates the rotors (4, 6, 8). An inner wall (34) of the housing (32) is formed so as to substantially match an outer contour of the rotors (4, 6, 8). The counter rotor (4) has a first axis of rotation (I), the intermediate rotor (6) has a second axis of rotation (II), and the rotor (4) has a third axis of rotation (III), wherein the first axis of rotation (I) and the second axis of rotation (II) enclose a first angle (f1) and the second axis of rotation (II) and the third axis of rotation (III) enclose a second angle (f2). Here, the first (f1) and the second angle (f2) are not equal to 0°. Furthermore, the rotor (8), the intermediate rotor (6) and the counter rotor (4), when mounted in the housing (32), form a truncated hemisphere.