Pump Clamping Arrangement for High Pressure Sealing
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Solution Overview
Problem
Conventional multistage pumps face issues with high pressure loads and hydraulic axial thrust during operation, leading to deformation and leakage, particularly in submersible pumps, due to the reliance on screw connections for sealing and load absorption.
Innovation Solution
A pump design featuring a clamping arrangement with a clamping element and means that secures the cover to the casing, allowing hydraulic thrust to be directed into the casing housing, reducing the load on screw connections and enhancing sealing by using a clamping force that is distributed through a clamping element and holding element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screw connections are used to secure the cover to the casing, then the cover can be closed and sealed, but the screw connection is subjected to high pressure loads and hydraulic axial thrust causing deformation and leakage
Solution Approach 1:
The clamping arrangement is divided into multiple clamping elements distributed around the cover-casing connection. Each clamping element independently absorbs local pressure loads and hydraulic axial thrust, preventing concentrated stress on screw connections and eliminating deformation-induced leakage.
2Strength
If conventional screw connections are used, then the cover can be secured to the casing, but the structure becomes complex and difficult to assemble
Solution Approach 1:
The clamping function and sealing function are merged into a single integrated clamping arrangement. The clamping elements simultaneously provide mechanical connection strength and sealing support, eliminating the need for separate screw connections and simplifying the assembly structure.
Solution Approach 2:
The screw connections are extracted from the design and replaced with the clamping arrangement. This removes the complex threading and fastening mechanisms while retaining the essential function of securing the cover to the casing under high pressure.
3Force
If screw connections are used to absorb hydraulic axial thrust, then the cover can be secured, but the screw connection deforms under high pressure affecting sealing behavior
Solution Approach 1:
The clamping elements are designed with localized contact surfaces that distribute the hydraulic axial thrust across multiple discrete points around the cover-casing interface. This local distribution prevents concentrated deformation and maintains uniform sealing pressure, preserving sealing precision under high axial loads.
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 2c
AI summary
The invention relates to a pump for conveying a fluid, comprising a casing (4) and a pump shaft (2) arranged inside the casing (4) and rotatable about an axis (A), with an impeller (34) arranged non-rotatably on the pump shaft (2) for acting on the fluid, wherein the pump (1) further comprises a pump inlet (7) for supplying the fluid to the interior and a pump outlet (6) for discharging the fluid from the interior, wherein one end of the casing (4) is closed with a cover (5, 51, 52), and the pump (1) comprises a clamping arrangement (10) for securing the cover (5, 51, 52) to the casing (4), wherein the clamping arrangement (10) comprises a clamping element (11) and a clamping means (12) that can be arranged in a bore (13) of the clamping element (11), wherein the clamping element (11) has a first contact surface (111) and a second contact surface (112) includes.The clamping device (12) is arranged to be movable relative to the clamping element (11) along a clamping axis (X) such that the clamping element (11) is clamped between the shell housing (4) and the cover (5, 51, 52) by interaction with the clamping device (12) in an installed state of the cover, wherein in the installed state a clamping force is exerted from the shell housing (4) via the first contact surface (111) to the second contact surface (112) on the cover, so that the cover (5, 51, 52) is secured in the installed state by the clamping force on the shell housing (4).