Shaft Seal Test Stand with Air-Gap Thermal Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing test devices for shaft seals lack efficient temperature control and dynamic measurement capabilities, and are limited in their ability to accurately measure friction torque due to contact-based thermal transfer and interference from ball bearings.
Innovation Solution
A test device with a chamber housing featuring annular grooves for non-contact temperature control, a rotatably mounted shaft connected to an electric motor, and a brake system for precise friction torque measurement, utilizing a Peltier element for efficient temperature regulation and a lever mechanism to detect deflection, allowing for dynamic measurements and relative friction torque analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If contact-based thermal transfer is used to control temperature, then temperature control is achieved, but thermal resistance increases and temperature control efficiency decreases
Solution Approach 1:
The patent introduces air as an intermediary medium between the housing and chamber housing. The air gap allows thermal energy to be transferred from the housing to the chamber housing without direct physical contact, eliminating the thermal resistance that would occur with contact-based thermal transfer while maintaining effective temperature control of the oil and chamber housing.
2Speed
If ball bearings are used to support the shaft, then rotational movement is achieved, but interference with friction torque measurement occurs
Solution Approach 1:
The patent removes the ball bearing from the system entirely. Instead of supporting the shaft with a ball bearing that interferes with measurements, the shaft is supported directly by the housing structure, eliminating the source of measurement interference while still enabling rotational movement of the shaft.
3Stability of the object's composition
If the chamber housing mass is increased for stability, then stability improves, but dynamic measurement capabilities decrease
Solution Approach 1:
The patent divides the housing structure into separate components: a stationary housing and a rotatable chamber housing. The chamber housing is supported on air bearings that provide stability while allowing rapid rotation. This segmentation enables the chamber housing to have low mass for dynamic measurements while the stationary housing provides structural stability.
4Temperature
If physical contact is used for thermal transfer, then heat transfer is achieved, but device complexity increases due to additional contact components
Solution Approach 1:
The patent uses air as a simple intermediary medium for thermal transfer between the housing and chamber housing. This eliminates the need for complex contact-based thermal transfer components such as heat exchangers or thermal conductors, reducing device complexity while maintaining effective heat transfer capability.
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
Enables efficient temperature control of the chamber housing and oil, precise measurement of friction torque, and relative change analysis, improving the dynamic measurement capabilities and reducing interference, while allowing for comparison of different oils and tribological systems.
Implementation Method 1
A temperature control unit having a Peltier element is arranged on the housing
Implementation Method 2
The annular grooves create a large surface area on the chamber housing, which faces a corresponding inner surface area, particularly with an air gap of constant radial width. This results in low thermal resistance, enabling heat to be transferred between the housing and the chamber housing without physical contact.
Implementation Method 3
a brake is provided, wherein the shaft is connected to a brake which is supported directly or by means of a torque support element on the support element
Implementation Method 4
the shaft is supported by means of a bearing, in particular a ball bearing, on the support part
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a device, in particular a testing device, having: a chamber housing; a shaft-sealing ring; a shaft; a bearing, in particular ball bearing; a brake; a supporting part; and a shaft part, in particular a shaft part which can be rotated by a motor. The shaft-sealing ring which is arranged, in particular runs, on the shaft part is accommodated in the chamber housing. The chamber housing is connected for conjoint rotation with the shaft, more particularly is formed integrally with the shaft. The shaft is mounted rotatably by means of the bearing, the bearing being accommodated in the supporting part. The shaft is connected to a brake which is supported on the supporting part directly or by means of a torque-supporting part. In particular, the shaft is connected for conjoint rotation with a first part of the brake, and a second part of the brake is connected to the supporting part directly or by means of a torque-supporting part.