Valve-Integrated Cavitation Sensing With Acoustic Waveguide Coupling
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Solution Overview
Problem
Existing cavitation sensing devices for hydrodynamic systems are not robust and require complex handling, often needing direct attachment to control valves, which increases costs and complexity.
Innovation Solution
A cavitation sensing unit with an elongated frame body and waveguide beam element acoustically connected to a control valve's housing, allowing for internal detection of cavitation without external sensors, using an acoustic coupling element and integrated electronic components like a printed circuit board for signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cavitation sensors are attached to the outer surface of the valve housing, then the device structure is simple, but the acoustic coupling and detection reliability are insufficient
Solution Approach 1:
The cavitation sensor is nested inside the valve housing, with the sensor element positioned within the valve body to achieve direct acoustic coupling with the cavitation source. This internal placement ensures reliable detection while the sensor can still be integrated during the manufacturing process.
Solution Approach 2:
An acoustic coupling element (such as a waveguide or acoustic bridge) is introduced as an intermediary between the sensor and the valve interior. This mediator transmits acoustic signals from the cavitation source to the sensor element, ensuring reliable acoustic coupling while allowing the sensor to be positioned optimally within or on the valve housing.
2Ease of operation
If external sensor attachments are used, then installation is simple, but the device requires additional external components increasing overall complexity
Solution Approach 1:
The cavitation sensor and the valve housing are merged into a single integrated unit. The sensor is either embedded within the housing during manufacturing or mounted using integrated mounting features, eliminating the need for separate external sensor attachments and reducing the overall number of components.
Solution Approach 2:
The valve housing serves multiple functions: it contains the valve mechanism, provides structural support, and acts as an acoustic coupling medium for the cavitation sensor. This multi-functionality reduces the need for additional dedicated sensor mounting structures.
3Reliability
If the sensor is integrated into the valve body, then detection reliability improves, but manufacturing complexity increases
Solution Approach 1:
The integrated sensor assembly is designed as a separate module that can be manufactured independently and then installed in the valve housing. This segmentation allows the sensor to be pre-tested and calibrated separately, while the valve housing can be manufactured using standard processes, reducing overall manufacturing complexity.
Solution Approach 2:
The sensor and its mounting structure are prepared in advance as a pre-assembled unit with pre-established acoustic coupling paths. This preliminary preparation ensures optimal acoustic coupling is achieved during installation without requiring complex adjustments or modifications to the valve housing during the manufacturing process.
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 more independent and cost-effective cavitation detection system, reducing material erosion and noise by enabling autonomous operation of control valves, eliminating the need for external sensor attachments and simplifying installation.
Implementation Method 1
a waveguide beam element having a first surface attached to an acoustic transducer and a second surface, opposite to said first surface
Implementation Method 2
an acoustic transducer attached to the waveguide beam element
Implementation Method 3
The connection between the cavitation sensing unit and the housing is acoustically coupling
Data Source
Figure 1~2
Figure 3a~5
AI summary
The invention relates to a cavitation sensing unit (14) for providing a cavitation sensing signal and being adapted to be connected to a control valve (16) of a hydrodynamic system (10) in an acoustically coupling manner, the control valve (16) comprising a housing (13) that comprises an inner chamber (15), characterized in that the cavitation sensing unit (14) comprises a frame body (32) and a connecting element having a first connecting partner (33) and a second connecting partner (34), wherein the first connecting partner (33) and the second connecting partner (34) are configured to connect to each other in an acoustically coupling manner, wherein the acoustic coupling element (38) comprises the first connecting partner (33) and wherein the frame body (32) comprises the second connecting partner (34). The invention provides an improved device for detecting cavitation in a hydrodynamic system (10), the device being more independent than in the prior art.