Hydrodynamic Closure Core Blind Bore Thermal Response
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Solution Overview
Problem
Existing closures with thermal safety functions for hydrodynamic machines have a relatively long reaction time, which is not sufficient to prevent overheating as the machines are subjected to higher temperature requirements, and there is a need for an improved design that can react faster to temperature increases.
Innovation Solution
A closure with a closure core having a blind bore or hole that is filled with a working medium for enhanced heat transfer, connected to a melting element that can be melted on, allowing for rapid sealing and unsealing of the passage to prevent medium leakage, with a design that includes a thin-walled structure and a spherical outer face to prevent jamming and ensure reliable adhesive bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a closure core with solid cylinder or hollow cylinder structure is used, then the thermal safety function can be implemented, but the axial length becomes relatively great
Solution Approach 1:
The closure core is inserted into a passage of the closure body, nesting one component inside another. This eliminates the need for the closure core to protrude axially from the closure body, thereby reducing the overall axial length while maintaining the thermal safety function through direct exposure to the working medium via the open end of the blind bore.
Solution Approach 2:
The invention transitions from a protruding axial design to a recessed radial design by providing a blind bore within the closure core. The open end of the blind bore faces the working medium directly, allowing heat transfer to occur radially through the blind bore walls rather than requiring axial protrusion, thus reducing axial length while improving thermal response.
2Speed
If the closure core protrudes axially from the closure body, then fast heating up is achieved through intimate heat transmission, but the axial length increases
Solution Approach 1:
The blind bore is provided with a reduced outer diameter compared to the passage inner diameter, creating a localized thin-walled structure. This thin-walled region provides intimate heat transmission from the working medium to the closure core material while containing the heat transfer surface within the closure body, avoiding axial protrusion and reducing overall length.
Solution Approach 2:
Instead of achieving heat transfer through axial protrusion, the invention creates an internal blind bore with open end facing the working medium. This redirects the heat transfer path from axial to radial direction, allowing the closure core to be heated quickly through its blind bore walls without increasing axial length.
3Ease of operation
If the outer diameter of closure core is reduced, then jamming is prevented, but adhesive bonding area is reduced
Solution Approach 1:
The connection between closure core and closure body is segmented into two functional zones: the blind bore region with reduced outer diameter for free movement and jamming prevention, and the bottleneck region with larger diameter for adhesive bonding. This segmentation allows each region to optimize its specific function without compromising the other.
Solution Approach 2:
The closure core is provided with a spherical outer face in the bottleneck region. This curved surface increases the surface area for adhesive bonding compared to a flat surface of the same projection area, thereby compensating for the reduced overall diameter and ensuring sufficient bonding strength while maintaining the reduced diameter needed to prevent jamming.
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 significantly reduces the reaction time of the thermal safety function, allowing for faster heat transfer and quicker sealing, effectively preventing overheating and damage to the hydrodynamic machine by enabling rapid melting and unsealing of the closure core.
Implementation Method 1
the closure core, whose front face is closed and is subjected to the working medium over its whole surface... washed around with working medium along its external circumference and hence creates an intimate heat-transmitting connection with the working medium
Implementation Method 2
for fast heating up of the bolt (closure core)... creates an intimate heat-transmitting connection with the working medium
Implementation Method 3
connected to the closure body respectively to the intermediate element by means of a melting element which can be melted on, so that the passage is sealed off... in the case of a sudden temperature rise... prevent any damage to the hydrodynamic machine by overheating
Data Source
AI summary
The invention relates to a closure with a thermal safety function for a hydrodynamic or hydraulic machine, in particular a hydrodynamic clutch, designed for use in a housing of the hydrodynamic or hydraulic machine which holds a working medium, wherein the closure has a closure body for screwing or inserting into the housing or mounting on the housing in some other way; the closure body has a passage into which a closure core is introduced, which closure core is connected, by means of a melting element which can be melted on at a predefined temperature, directly to the closure body or to an intermediate element introduced in a seal-forming fashion in the closure body, in such a way that the passage is sealed off so as to prevent the working medium from passing through. The invention is characterized in such a way that the closure core has a blind bore or a blind hole which is open with respect to the working space, with the result that working medium can flow into the closure core.