Radiator Nipple Design with Toroidal Seal for Reduced Tightening Torque
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Solution Overview
Problem
Existing radiator nipples are heavy, expensive to manufacture, require high tightening torques, and often fail to maintain a fluid seal over time due to their large size and inadequate sealing mechanisms.
Innovation Solution
A lightweight nipple design featuring a cylindrical shape with inclined chamfers and a toroidal seat, combined with a radially arranged elliptic seal and teeth on the inner edge, ensures a secure and efficient hydraulic seal with reduced tightening torque, using a sealing wall and chamfers to evenly compress the seal, and inclined walls for assembly and radial blockage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional hollow cylindrical nipples are used for connecting radiator elements, then the connection provides structural strength, but the nipple becomes heavy and expensive to manufacture
Solution Approach 1:
The nipple is divided into multiple functional segments: an external threading portion for mechanical connection, a sealing portion with chamfers and toroidal seat for fluid sealing, and a reduced-thickness intermediate section. This segmentation allows each portion to be optimized independently, reducing overall material usage while maintaining connection strength.
Solution Approach 2:
Different portions of the nipple have different wall thicknesses tailored to their specific functions. The threading portion maintains sufficient thickness for mechanical strength, while the intermediate section has reduced thickness to minimize weight. The sealing portion incorporates localized features (chamfers, toroidal seat) only where needed for sealing, rather than uniformly thickening the entire nipple.
2Reliability
If traditional nipples are designed to ensure fluid seal, then sealing capability is achieved, but high tightening torques (up to 20 Kgm) are required
Solution Approach 1:
A toroidal seal element is introduced as an intermediary between the nipple and radiator element connecting ends. This seal mediator distributes the sealing load around the entire circumference, converting the concentrated high-torque requirement into a distributed low-torque application, thereby reducing the required tightening torque while maintaining reliable fluid sealing.
Solution Approach 2:
The toroidal (ring-shaped with circular cross-section) geometry of the seal provides curved contact surfaces that naturally distribute stress and pressure more evenly compared to flat sealing surfaces. This curvature allows the seal to conform to the mating surfaces and maintain sealing under lower clamping forces, reducing the required tightening torque.
3Duration of action of stationary object
If traditional nipples are used, then connection is achieved, but the sealing mechanism fails to maintain fluid seal over time
Solution Approach 1:
The toroidal seal is pre-compressed between the chamfered surfaces of the nipple and the radiator element connecting ends during assembly. This pre-cushioning compensates for future settling, thermal expansion/contraction, and vibration, maintaining the fluid seal over time without requiring excessive initial tightening torque that could cause deformation or failure.
4Ease of operation
If larger nipple sizes are used to reduce tightening torque, then assembly effort is reduced, but the nipple becomes heavier and more expensive
Solution Approach 1:
The invention changes the geometric parameters of the nipple, specifically the wall thickness distribution and the inclusion of chamfer angles, to optimize the balance between assembly effort and weight. By carefully selecting the thickness of each segment and the angles of the chamfers, the design achieves adequate sealing and connection with minimal material, reducing weight while keeping assembly torque requirements reasonable.
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 results in a lighter, less expensive nipple that maintains a perfect fluid seal over time with reduced assembly effort, allowing for larger water flow and electrical resistance installation, while requiring only moderate tightening torque and ensuring even compression for long-term sealing performance.
Implementation Method 1
using a sealing wall and chamfers to evenly compress the seal
Implementation Method 2
inclined walls for assembly and radial blockage
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
A nipple (4) for radiator elements (8) that allows a quick and safe connection between radiator elements (8), ensuring perfect fluid seal even over time. The nipple (4) is inexpensive and light to make, and requires an especially moderate tightening torque.