Rotary Pump Mechanical Seal with Perpendicular Locking Pin
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Solution Overview
Problem
Existing rotating pumps face challenges in achieving a secure seal, particularly in hygienic areas like the food and cosmetics industry, where traditional shaft sealing methods are complex and prone to damage, and require disassembly for maintenance, which complicates the process and risks contamination.
Innovation Solution
A rotating pump design featuring a mechanical seal with a form-fit position lock perpendicular to the shaft axis, utilizing a pin guided through a bore in the wall with an internal thread and a sealing screw to secure the seal, ensuring easy handling and prevention of seal rotation or shifting, and incorporating a sheet-metal protection for the leakage space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical seal is used to ensure secure sealing, then sealing reliability is improved, but device complexity increases due to the need for additional securing structures
Solution Approach 1:
The mechanical seal is divided into two functional parts: a stationary seal ring integrated into the product space wall and a rotating seal ring connected to the shaft. This segmentation allows each component to be optimized independently while working together to provide reliable sealing without requiring complex external securing structures.
2Reliability
If a flange or receptacle is used to secure the mechanical seal, then axial securing is improved, but ease of operation deteriorates due to the need for complete disassembly for maintenance
Solution Approach 1:
The stationary seal ring is nested directly into a recess in the product space wall, eliminating the need for separate flanges or receptacles. This nested design allows the seal to be secured axially while maintaining clean access to the product space, enabling maintenance without complete disassembly of the pump structure.
3Reliability
If the mechanical seal is installed on the product side, then sealing performance is improved, but ease of manufacture deteriorates due to difficult assembly from the narrow leakage space
Solution Approach 1:
The stationary seal ring is pre-installed into the recess in the product space wall before the shaft and rotating seal ring are assembled. This preliminary action allows the seal components to be positioned correctly before final assembly, making installation from the product side straightforward and avoiding the need for complex assembly procedures through narrow spaces.
4Reliability
If the shaft is sealed against the wall, then product contamination is prevented, but ease of operation worsens due to restricted access for seal maintenance
Solution Approach 1:
The stationary seal ring is extracted from the traditional flange or receptacle structure and integrated directly into the product space wall recess. This extraction allows the seal to maintain effective contact with the shaft for contamination prevention while being accessible from the product side for maintenance without requiring removal of external securing structures.
Data Source
Figure 1
Figure 2
AI summary
A rotary pump is presented with at least one driven conveying element (10, 11) arranged in a product chamber through which the product to be conveyed flows and driven by a shaft (12, 13) projecting from the outside into the product chamber, wherein the shaft (12, 13) is sealed against a wall (50) of the product chamber, and wherein the seal is designed as a product-side mechanical seal (51, 52) and includes a positive locking mechanism to prevent rotation of the mechanical seal (51, 52) as well as displacement of the mechanical seal (51, 52) towards the product chamber. The pump is characterized in that the locking mechanism comprises a locking element (61) extending through the wall (50) approximately perpendicular to an axial direction of the shaft (12, 13).