Ventilation device for domestic use and method for assembling or maintenance of a ventilating device
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Solution Overview
Problem
Existing ventilation units with radial fans and backward-curved blades face challenges in precise differential pressure measurement due to potential influences from dust, moisture, and mounting tolerances, which affect the accuracy of volume flow control.
Innovation Solution
The differential pressure sensor is positioned in a receiving chamber within the junction area of two housing parts, isolated from the air flow, with a connection to the ducts for stable pressure measurement, and is mounted on a separate bracket for easy removal and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the differential pressure sensor is positioned within the air flow path for direct pressure measurement, then the measurement responsiveness is improved, but the sensor is exposed to dust and moisture causing measurement inaccuracies
Solution Approach 1:
The housing is divided into a first housing part and a second housing part, with the differential pressure sensor arranged in the connection area between them. This segmentation allows the sensor to be positioned in a protected receiving chamber that is isolated from the direct air flow path, yet still accessible to pressure conditions through controlled connections.
Solution Approach 2:
A receiving chamber is introduced as an intermediary space between the air flow path and the differential pressure sensor. This receiving chamber is defined by the housing parts and provides a protected environment for the sensor, allowing pressure measurement without direct exposure to harmful particles in the air stream.
2Reliability
If the differential pressure sensor is securely fixed within the housing for stable measurement, then the measurement stability is improved, but the sensor replacement and maintenance becomes difficult
Solution Approach 1:
The mounting solution provides dynamic characteristics by allowing the differential pressure sensor to be easily inserted and removed from the connection area between the housing parts. The sensor can be securely positioned during operation for stable measurement, yet quickly replaced when maintenance is needed, adapting between fixed and movable states.
Solution Approach 2:
The housing is pre-configured with a connection area and receiving chamber structure that anticipates future sensor replacement needs. The geometry of the connection area between the first and second housing parts is designed to facilitate easy sensor access and removal, preparing the structure in advance for maintenance operations.
3Object-affected harmful factors
If the differential pressure sensor is positioned away from the air flow for protection, then the sensor is protected from particles, but the pressure measurement may be affected by mounting tolerances
Solution Approach 1:
The receiving chamber in the connection area provides localized protection for the differential pressure sensor while maintaining appropriate pressure connection characteristics. The specific geometry and positioning of the receiving chamber in the connection area between housing parts creates optimal local conditions for both protection and accurate pressure measurement.
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
This configuration ensures precise and continuous pressure measurement, minimizing measurement inaccuracies and facilitating easy maintenance of the sensor, thereby maintaining stable volume flow control.
Implementation Method 1
Differential pressure measurement is typically used for volume flow control in such fans. During differential pressure measurement, pressures within the housing are measured at at least two points using a differential pressure sensor. The resulting differential pressure, which is preferably proportional to the volume flow rate in the supply or exhaust air duct, serves as the control variable
Implementation Method 2
Highly efficient ventilation units, especially residential ventilation units, utilize radial fans with backward-curved blades to generate the supply or exhaust airflow
Data Source
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AI summary
The invention relates to a ventilation device (100) for building services, comprising a housing (102), at least one supply air and/or exhaust air duct (104, 106) arranged in the housing (102) for guiding a supply air or exhaust air flow (108, 110) through the housing (102), at least one radial fan (116) with backward-curved blades (120) arranged in the supply air and/or exhaust air duct (104, 106) for generating the supply air or exhaust air flow (108, 110), and at least one differential pressure sensor (128) arranged inside the housing (102), which is configured to detect pressure conditions at at least two measuring points (132, 132') in the housing (102), on the basis of which a supply air or exhaust air volume flow flowing through the supply air and/or exhaust air duct (104, 106) is controlled. becomes.The housing (102) is formed from at least one first housing part (112) and a second housing part (114) corresponding to the first housing part (112) and forming a connection area (124), wherein the differential pressure sensor (128) is arranged in the connection area (124) of the first and second housing parts (112, 114) in a receiving space (126) defined by at least one of the housing parts (112, 114) which is unaffected by the supply air or exhaust air flow (108, 110).