Helical Spindle Pump Floating Seal Gap Elimination
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Solution Overview
Problem
Helical spindle pumps experience inefficiency due to internal return flow caused by a gap between the feed screw and housing, leading to radial force deflection and limited pressure difference, resulting in wear and reduced operational effectiveness.
Innovation Solution
A floatingly mounted separating element is introduced between the feed screws and the inner wall of the feed housing, allowing for contact without a gap, reducing wear and maintaining efficiency by accommodating shaft deflection through radial movement and elastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is provided between the outer wall of the feed screw and the inner wall of the feed housing to accommodate shaft deflection, then contactless operation is ensured, but internal return flow occurs causing efficiency loss
Solution Approach 1:
A separating element is introduced as an intermediary component between the feed screw outer wall and the feed housing inner wall. This separating element can move radially to accommodate shaft deflection while maintaining contact with the feed screw, thereby preventing internal return flow and efficiency loss without compromising contactless operation.
2Reliability
If the permitted pressure difference is limited to avoid contact between the feed screw and housing, then shaft deflection is controlled, but pump performance is restricted
Solution Approach 1:
The separating element acts as a mediator that allows the feed screw to maintain contact during shaft deflection without directly contacting the housing. This enables the pump to handle higher pressure differences and improve performance while the separating element absorbs the deflection, maintaining reliability.
Solution Approach 2:
The separating element is designed with radial movement capability, allowing it to dynamically adjust its position according to shaft deflection. This dynamic adaptation enables the system to handle varying pressure differences and loads while maintaining proper clearance and preventing damage.
3Reliability
If a gap is provided to accommodate shaft deflection, then contact wear is avoided, but a gap is created causing internal return flow and efficiency loss
Solution Approach 1:
The separating element serves as a mediator that maintains continuous contact with the feed screw outer wall, preventing gap formation and internal return flow. Meanwhile, it accommodates shaft deflection through radial movement, ensuring wear prevention is maintained without sacrificing efficiency.
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 solution eliminates the gap between the feed screws and housing, preventing internal return flow and maintaining contact, thereby enhancing the pump's efficiency and operational stability by reducing wear and maintaining pressure difference.
Implementation Method 1
the separating element is able to be radially elastically deformed and/or radially moved at least in some portions
Data Source
AI summary
The invention relates to a dual-spindle helical spindle pump with a single-entry design, comprising a pump housing (11) which has a pump portion (12), a bearing portion (13) and a gear portion (14) with a gear chamber, wherein the bearing portion (13) and the pump portion (12) are designed separately from one another, comprising a feed housing part (50) as a component of the pump portion (12) in which two feed screws (17, 18) are provided, said feed screws having flanks (46) and being arranged on shafts (15, 16) in a feed space (51), wherein the shafts (15, 16) are mounted in the bearing portion (13) (external bearing system) and extend into the gear portion (14), and wherein the feed housing part (50) has at least one feed portion (52) with an inner wall (58) which faces the outer face (59) of the feed screws (17, 18). The invention provides that at least one separating element (60), which is in contact with at least one portion of the outer face (59) of the feed screws (17, 18), is between the inner wall (58) of the feed portion (52) and the outer face (59) of the feed screws (17, 18), at least in the region (57) of the feed screws (17, 18), and in that the separating element (60) is floatingly mounted in the feed housing part (50) relative to the inner wall (58) of the feed portion (52).