Control device for a boiler
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Solution Overview
Problem
Existing water level control devices for boilers in hot drink dispensers fail to maintain adequate sealing over time, especially under high temperatures and pressure, leading to leakage issues and increased complexity and cost in manufacturing.
Innovation Solution
A control device featuring a fastening element with a through hole, an insulator with a circumferential groove for a sealing ring, and a level probe coated by the insulator, where the insulator is wedged into the fastening element by increased pressure, ensuring a hermetic seal without additional locking elements and maintaining effectiveness at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If known locking systems are used to secure the insulator to the fastening element, then the insulator is retained in position, but the sealing ability deteriorates under high pressure and temperature due to plastic deformation of the insulator
Solution Approach 1:
The system is segmented into distinct functional components: the fastening element with through-hole, the insulator, and the sealing ring. The sealing function is separated from the retention function, allowing the insulator to be retained by mechanical interference fit while the sealing ring provides the sealing interface that is not subjected to plastic deformation of the insulator material.
Solution Approach 2:
The sealing ring acts as an intermediary element between the insulator and the fastening element. It transfers the sealing function away from the insulator material itself, allowing the insulator to focus on electrical insulation and structural retention without compromising sealing integrity under thermal and pressure stress.
2Strength
If complex locking systems are used to secure the insulator, then the insulator is firmly retained, but the device complexity and manufacturing cost increase
Solution Approach 1:
The complex locking mechanisms are extracted and removed from the design. Instead of using threaded elements or precision fastening systems, the solution relies on a simple interference fit between the insulator and the through-hole of the fastening element, combined with the sealing ring to maintain retention strength while dramatically reducing device complexity and manufacturing cost.
Solution Approach 2:
The design employs simple, inexpensive components that can be easily manufactured and replaced if needed. The insulator and sealing ring are designed as straightforward parts without complex features, enabling cost-effective mass production while maintaining adequate retention through proper dimensional design of the through-hole interference fit.
3Strength
If threaded elements are used to fasten the insulator, then the insulator can be securely retained, but the risk of damaging the insulator material increases due to precise tightening force requirements
Solution Approach 1:
The threaded mechanical fastening system is replaced with a simpler interference fit mechanism. Instead of requiring threaded engagement and precise torque control, the insulator is retained through dimensional interference with the through-hole, eliminating the risk of thermal or mechanical damage associated with threaded fastening while maintaining adequate retention strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a perfect hermetic seal, preventing water or vapor leakage, even at elevated temperatures, while simplifying and cost-reducing the manufacturing process by eliminating the need for complex locking mechanisms and materials that can deform under pressure.
Implementation Method 1
when the liquid in the boiler is heated, the resulting pressure increase within the boiler pushes the insulator outwards, therefore it gets stuck with more strength into the fastening element
Implementation Method 2
when the liquid in the boiler is heated, the resulting pressure increase within the boiler
Implementation Method 3
a sealing ring (4), wherein there is provided a first abutment area (8) which is circumferential and internal to the fastening element (2)
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
A control device (1 ) of the water level in a boiler, comprising - a fastening element (2) for fastening the control device (1 ) to the boiler, - an insulator (3) inserted into the fastening element (2), - an o-ring (4), - a level probe (5) having a portion coated by the insulator (3) and one end (6) internal to the boiler when the control device (1 ) is fastened to the boiler, wherein the insulator has a circumferential groove (7) where the o-ring is accommodated, and wherein the o-ring (4) abuts against a first abutment area (8) of the fastening element (2).