Seal Shaft-Holding Force Measurement Across Wide Temperature Ranges
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Solution Overview
Problem
Existing methods for measuring the shaft-holding force of seals fail to account for high or low temperature conditions due to the force-measuring sensor being directly installed between two half-shafts, limiting the measurement range of the sensor.
Innovation Solution
A measuring device and method that includes a test box, pressure sensor outside the box, and an adiabatic rod connecting the sensor to a conical shaft within the box, allowing the sensor to operate independently of the box's temperature, thus enabling measurements across a wider temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the force-measuring sensor is directly installed between the two half-shafts, then the structure is simple and easy to operate, but the sensor cannot measure shaft-holding force under high or low temperature conditions due to temperature limitation
Solution Approach 1:
The measuring device is divided into two separate parts: a test box containing the seal and conical shaft, and a pressure sensor located outside the test box. This segmentation allows the sensor to operate in a controlled environment while the test box can be subjected to various temperature conditions, resolving the contradiction between operational simplicity and temperature adaptability.
Solution Approach 2:
An adiabatic rod is introduced as an intermediary element to connect the conical shaft inside the test box with the pressure sensor outside. The adiabatic rod transmits mechanical force while blocking thermal transfer, enabling the sensor to accurately measure shaft-holding force under high or low temperature conditions without being directly exposed to extreme temperatures.
2Device complexity
If the force-measuring sensor is directly installed between the two half-shafts, then the device complexity is low, but the measurement precision is limited by the sensor's use temperature conditions
Solution Approach 1:
The device is segmented into a test box and a separate pressure sensor system. This segmentation allows the sensor to operate in a stable, controlled environment away from extreme temperatures, thereby improving measurement precision while maintaining relatively simple device complexity through modular design.
Solution Approach 2:
The adiabatic rod serves as an intermediary that transmits mechanical force from the conical shaft to the pressure sensor while preventing thermal interference. This enables high-precision measurements under high or low temperature conditions by isolating the sensor from temperature effects while maintaining the measurement function.
3Adaptability or versatility
If the pressure sensor is placed outside the test box connected by an adiabatic rod, then the sensor can operate independently of the test box temperature, but the device complexity increases
Solution Approach 1:
The adiabatic rod is introduced as an intermediary element that connects the conical shaft inside the test box with the pressure sensor outside. This intermediary structure enables the sensor to operate independently of the test box temperature while maintaining a relatively simple overall device configuration through straightforward mechanical connection.
Solution Approach 2:
The adiabatic rod functions as a thermal insulation barrier that allows mechanical force transmission while blocking thermal transfer. This flexible yet protective element enables temperature-independent sensor operation without requiring complex thermal management systems, thus balancing adaptability with device complexity.
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 accurate measurement of shaft-holding force under high or low temperature conditions by isolating the pressure sensor from the test box's environment, expanding the usable temperature range for seal performance evaluation.
Implementation Method 1
an adiabatic rod slidably passes through the second support, and the pressure sensor and the conical shaft are respectively fixed at two ends of the adiabatic rod
Data Source
AI summary
The present disclosure provides a measuring device and measuring method for a shaft-holding force of a seal, relating to the technical field of sealing. The measuring device of a shaft-holding force of a seal includes a driving assembly, a first pressing plate, a pressure sensor, an adiabatic rod, a conical shaft, a first support, a second support, a test box and a seal, a working temperature of the seal may be simulated by the test box, the conical shaft is located inside the test box, the pressure sensor is located outside the test box, the adiabatic rod is connected between the pressure sensor and the conical shaft, and the pressure sensor and the conical shaft are in different environments. Through separating the pressure sensor from the test box by the adiabatic rod, a temperature of the test box will not affect the pressure sensor.