Bell Cup Clamping Connection for Rotary Atomizer
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Solution Overview
Problem
The existing screw connection method for attaching a bell cup to a rotary atomizer is prone to contamination, imbalance, and mechanical inertia issues, leading to potential bearing failure and damage, and requires time-consuming cleaning and multiple rotations for secure fastening.
Innovation Solution
A clamping connection using an annular circumferential clamping surface and centering cones, along with a clamping ring and ball mechanism, provides a secure, form-fitting attachment without screws, ensuring axial clamping and centering of the bell cup on the rotary atomizer, and an outer rinsing system for cleaning the bell cup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screw connection with fine thread is used to fasten the bell cup to the turbine shaft, then the bell cup can be securely attached, but the fine thread becomes contaminated requiring time-consuming cleaning and may cause imbalance leading to bearing failure
Solution Approach 1:
The invention extracts and removes the problematic fine thread screw connection from the fastening system. Instead of using a screw connection, the bell cup is fastened directly to the turbine shaft through a form-fitting connection with clamping elements, eliminating the thread that requires cleaning and maintenance.
Solution Approach 2:
The invention uses a simple form-fitting connection with clamping elements that can be easily replaced if contaminated or damaged, rather than maintaining a complex threaded connection that requires careful cleaning and protection.
2Reliability
If a screw connection is used to fasten the bell cup, then attachment is achieved, but numerous rotations are required to screw the bell cup onto the turbine shaft
Solution Approach 1:
The bell cup and turbine shaft are designed with pre-aligned form-fitting connections and clamping elements that automatically engage when the bell cup is placed on the shaft, eliminating the need for multiple rotational fastening operations.
3Reliability
If a screw connection is used to fasten the bell cup, then attachment is achieved, but there is a risk that the bell cup can tilt relative to the turbine shaft causing damage to the fine thread
Solution Approach 1:
The invention removes the vulnerable fine thread from the fastening system entirely, replacing it with a form-fitting connection that is not susceptible to tilting damage. The clamping elements engage directly with the bell cup body, providing tolerance to misalignment.
4Reliability
If a screw connection is used to fasten the bell cup, then attachment is achieved, but there is a risk of loosening due to mechanical inertia during jerky braking or bearing blockage
Solution Approach 1:
The invention uses clamping elements with curved or spherical contact surfaces that engage with corresponding surfaces on the bell cup, creating a mechanically interlocked connection that resists loosening from inertial forces during braking or blockage events.
Data Source
AI summary
The disclosure relates to a bell cup for a rotary atomizer for spraying coating agent (e.g. paint), with a spray-off body with a ring-shaped spray edge for spraying the coating agent, a hub part. Assembly of the bell cup on a rotatable hollow shaft of the rotary atomizer, and a fastening arrangement for form-fittingly fastening of the bell cup on the hollow shaft of the rotary atomizer. The disclosure provides that the fastening arrangement in the outer lateral surface of the hub part has a ring-shaped clamping surface that is inclined to the axis of rotation of the bell cup for the contact of a clamping element of the Rotary atomizer in order to clamp the bell cup with an axial clamping force on the hollow shaft of the rotary atomizer.