Screw Spindle Pump Coupling Element Flow Cross-Section
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Solution Overview
Problem
Existing screw pumps face challenges with coupling devices that significantly reduce the flow cross-section, impeding fluid flow and affecting delivery performance.
Innovation Solution
A screw spindle pump with a disc-shaped coupling element that has a plug-in receptacle for the drive shaft and is coupled in a rotationally fixed manner to the drive spindle via positive engagement with axially projecting projections. The coupling element is designed to minimize interference with the flow cross-section, ensuring that the fluid can flow axially without significant obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional coupling element is used to connect the drive shaft to the drive spindle, then the coupling provides rotationally fixed connection, but the flow cross-section is significantly reduced, impeding fluid flow
Solution Approach 1:
The coupling element is divided into multiple functional zones: a central hub region for rotational coupling and peripheral regions with reduced material presence to maintain flow cross-section. The coupling features radially extending arms or fins that provide structural integrity for torque transmission while leaving the central flow path open, segmenting the solid material distribution to balance mechanical and fluidic requirements.
Solution Approach 2:
The coupling element utilizes three-dimensional spatial arrangement to resolve the contradiction. By designing the coupling with axial thickness and radial extensions, it creates a multi-dimensional structure where the rotational connection function is achieved in the radial plane while the flow cross-section is preserved in the axial and central radial regions. The coupling arms extend axially and radially to provide torque transmission paths without blocking the central fluid passage.
2Stability of the object's composition
If the coupling element is designed with larger diameter to ensure robust connection, then the rotational stability is improved, but the delivery performance is reduced due to flow obstruction
Solution Approach 1:
The coupling element exhibits local quality variations where different regions serve different functions. The peripheral regions contain thicker material or structural features for rotational stability and torque transmission, while the central region maintains reduced material presence to preserve flow cross-section. This spatial variation in material distribution allows the coupling to provide robust rotational connection locally while maintaining high delivery performance globally by not obstructing the flow path.
Data Source
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AI summary
Screw spindle pump comprising a spindle housing (5) in which a drive spindle (6) and at least one meshing spindle (7) are received in spindle bores, wherein the drive spindle (6) has a cylindrical spindle core (11) and at least two spindle profiles (12) rotating around the spindle core (11), and a disc-shaped coupling element (10) is arranged on an end face of the drive spindle (6) in a recess (14) axially limited by a flat bottom surface (15), in which the two profile valleys (13) between the two spindle profiles (12) open offset by 180°, the coupling element having a socket (24) for a drive shaft (9) of a drive motor (8), and the coupling element being engaged in at least one direction of rotation of the drive spindle (6) by means of a positive engagement with axially projecting projections (16) that laterally limit the recess (14) and that engage in lateral receptacles (20) of the coupling element. (10) intervene,is rotationally fixed to the drive spindle (6), wherein the bottom surface (15) in the area of the openings of the two profile valleys (13) is limited by the spindle core (11) and the coupling element (10) is rounded in the element areas (18) adjacent to the areas of the opening, corresponding to the shape of the spindle core (11), wherein the diameter (DB) of the coupling element (10) in the area of the rounded element areas (18) is at most equal to or less than the diameter (DK) of the spindle core (11).