Dead Tank Circuit Breaker Mounting Structure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional dead tank circuit breakers face issues with inaccurate tank placement and poor bolt connections due to large tolerances and low strength materials, leading to play and instability in the mounting structure.
Innovation Solution
A mounting structure featuring a tank flange with elongated first bores and transverse second bores, where pins with threaded pin bores are used to secure the tank to the support structure, allowing for accurate alignment and high-torque connections despite tolerance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bolts are used to secure tanks to support structure, then the mounting structure is simple, but large tolerances result in play and poor bolt connections
Solution Approach 1:
A pin with a threaded bore is introduced as an intermediary component between the bolt and the tank flange. The pin is first inserted into the tank flange, and then the bolt threads into the pin, creating a more reliable connection that accommodates tolerance variations while maintaining connection integrity
Solution Approach 2:
The pin is pre-inserted into the tank flange before the bolt is installed. This preliminary action establishes a precise reference point and threaded pathway that guides the bolt, ensuring accurate alignment and reducing the impact of tolerance accumulation during assembly
2Manufacturing precision
If through holes with large tolerances are used for bolts, then manufacturing is easier, but placement accuracy of tanks deteriorates
Solution Approach 1:
The mounting connection is divided into two separate operations: first inserting the pin into the flange, then threading the bolt into the pin. This segmentation allows the flange holes to be larger and easier to manufacture while still achieving precise tank placement through the two-stage assembly process
Solution Approach 2:
The pin serves as a mediator that decouples the tolerance requirements of the flange holes from the final placement accuracy. The pin can be precisely manufactured and fitted into the flange, while the bolt provides the final positioning, separating the manufacturing tolerances from the assembly precision
3Strength
If bolts are used directly in low strength material, then the structure is simple, but connection strength deteriorates
Solution Approach 1:
The pin acts as an intermediary that distributes and transfers loads more effectively through the low-strength flange material. By threading the bolt into the pin rather than directly into the flange, the connection strength is enhanced while the flange material requirements remain less stringent
Solution Approach 2:
The mounting connection creates a composite structure combining the pin and bolt as stronger elements with the low-strength flange material. This composite approach allows the connection to achieve higher strength through the pin-bolt assembly while the flange provides adequate support
Data Source
AI summary
Mounting structure is provided for mounting a tank to support structure. The tank has a flange extending from a body thereof. The mounting structure includes at least a pair of first bores extending into the flange in a first direction. At least a pair of second bores. Each second bore extends into the flange in a direction generally transverse with respect to an associated first bore so that each second bore communicates with the associated first bore. A pin is disposed in each of the second bores. Each pin has a threaded pin bore that aligns axially with the associated first bore. A bolt is disposed through a bolt hole in the support structure, into an associated first bore and in threaded engagement with the threaded pin bore of an associated pin so as to secure the tank to the support structure.