Variable Speed Drive Rear Part Sealing and Insertion
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Solution Overview
Problem
Existing variable speed drive architectures face challenges in achieving tight sealing, particularly when non-removable fixing lugs are present, which complicates the insertion through openings in frames and prevents a one-piece rear part design, while existing solutions either require specific seals or complex frame sizing.
Innovation Solution
A variable speed drive design with a rear part having prominent fixing lugs and a clearance slot allows axial insertion through a frame opening, with a sealed cover and peripheral seal ensuring IP55 tightness, maintaining a simple two-part assembly and easy installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the opening in the frame is sized to accommodate prominent fixing lugs, then the fixing lugs can be non-removable and prominent, but the variable speed drive cannot be inserted through the opening
Solution Approach 1:
The rear part is segmented into a main body and a fixing base, with the fixing base containing the prominent fixing lugs. This segmentation allows the main body to have a reduced cross-section that can pass through the opening, while the fixing lugs remain prominent for secure mounting.
Solution Approach 2:
The fixing base extends the main body towards the rear along the main axis, positioning the fixing lugs in a different spatial dimension (rear direction) from the insertion path. This allows the lugs to be prominent without blocking the insertion path through the opening.
2Reliability
If a specific seal shape is used to seal the space between the variable speed drive and frame edges, then tightness is achieved, but the seal fitting becomes difficult and complex
Solution Approach 1:
A flexible seal element is used that can deform to conform to the opening periphery and the collar surface. This flexible membrane approach simplifies the seal shape while maintaining tightness, as the seal naturally adapts to the mating surfaces during insertion and compression.
Solution Approach 2:
The seal is pre-positioned on the collar before insertion, and its placement is guided by the insertion process itself. The collar's position relative to the opening ensures the seal is correctly positioned and compressed between the collar and the opening periphery, simplifying the fitting process.
3Ease of manufacture
If the opening contour follows the flange shape, then a standard seal can be used, but the rear part cannot have prominent fixing lugs
Solution Approach 1:
The rear part is divided into a main body with a reduced cross-section and a fixing base with prominent fixing lugs. This segmentation allows the main body to interface with the standard seal and opening, while the fixing lugs extend beyond the seal area to provide secure mounting.
Solution Approach 2:
The fixing lugs are positioned in the rear direction, extending beyond the plane of the collar and seal. This dimensional separation allows the lugs to be prominent for strong fixing while the main body maintains the proper profile for sealing against the standard opening.
4Ease of operation
If removable fixing lugs are used to allow insertion through the opening, then insertion is possible, but the manufacture of the rear part becomes complicated and cannot be a one-piece structure
Solution Approach 1:
The rear part is segmented into a main body and a fixing base that are integrally formed as a one-piece structure. The fixing base contains the prominent fixing lugs and is monolithically connected to the main body, simplifying manufacture while enabling insertion through the opening.
Solution Approach 2:
The fixing base extends the main body towards the rear, positioning the fixing lugs in a dimension that does not interfere with the insertion path. This allows the lugs to be prominent and permanent while the main body maintains a reduced cross-section for easy insertion through the opening.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
The drive (1) has a front part and a rear part (11) that are formed in such a way as to have passages to access from a front of the variable speed drive. Fixing tabs are situated at a rear side of the drive. The passages are produced parallel to a main axis, and an undercut is produced on a main body of the rear part, where the undercut includes sufficient depth to allow the fixing plinth to pass through an opening. A flange is arranged to serve as a bearing surface for a gasket. Independent claims are also included for the following: (1) a control system (2) a method for mounting a variable speed drive.