Particulate Sensor Using Venturi Negative Pressure
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Solution Overview
Problem
Existing particulate sensors require a compressed air source, such as a pump, for operation, which increases system size and cost and leads to service life issues.
Innovation Solution
The particulate sensor utilizes negative pressure generated by the Venturi effect in the discharge port to introduce and discharge gas under measurement, eliminating the need for a compressed air source by using a tapered discharge port and multiple introduction ports on the outer circumference, and incorporates an internal ion source for ionization within the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compressed air source such as a pump is used to introduce and discharge exhaust gas in the particulate sensor, then the gas flow and detection function are achieved, but the system size increases and cost increases
Solution Approach 1:
The patent extracts and eliminates the compressed air source (pump) from the system by utilizing the natural negative pressure already present in the exhaust gas flow to achieve gas introduction and discharge, thereby reducing system size while maintaining detection functionality
Solution Approach 2:
The exhaust gas flow itself generates the negative pressure needed for gas introduction and discharge through its own movement, making the system self-sufficient without requiring external compressed air sources
2Reliability
If a compressed air source such as a pump is used to operate the detection section, then gas introduction and discharge are achieved, but the service life decreases
Solution Approach 1:
The patent removes the pump component that has limited service life, replacing it with a passive negative pressure utilization mechanism that has no moving parts and therefore no service life limitations
Solution Approach 2:
The system uses the exhaust gas flow's own negative pressure to perform the gas introduction and discharge functions, eliminating the need for mechanical pumps that wear out and require maintenance
3Reliability
If a compressed air source is used in the particulate sensor, then the detection operation is enabled, but the cost increases
Solution Approach 1:
The patent eliminates the compressed air source component, thereby removing the associated manufacturing costs, maintenance costs, and system integration costs while maintaining the essential detection operation through negative pressure utilization
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 allows for effective introduction and discharge of gas without a compressed air source, reducing system size and cost while maintaining efficient particulate detection through ionization and electrification.
Implementation Method 1
the discharge port is provided at a tubular distal end portion which is tapered off. In this case, due to the so-called Venturi effect, the flow velocity of the gas under measurement increases outside the discharge port, whereby a negative pressure is produced in the discharge port.
Data Source
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AI summary
A particulate sensor (1) which detects particulates (S) contained in a gas under measurement (EG) flowing within a gas flow pipe (EP) has a space forming portion (12) and an ion source (15). The space forming portion (12) projects into the gas flow pipe (EP) and forms an internal space (MX). The space forming portion (12) has an introduction port (43I) for introducing the gas under measurement (EG) into the internal space (MX) and a discharge port (480) for discharging from the internal space (MX) the gas (EGI) introduced through the introduction port (43I). The source (15) produces ions (CP) by gaseous discharge. The space forming portion (12) is configured such that, through utilization of a negative pressure produced in the discharge port (480) by the gas under measurement (EG) flowing within the gas flow pipe (EP), the introduced gas (EGI) is discharged from the internal space (MX) through the discharge port (480), the gas under measurement (EG) is introduced into the internal space (MX) through the introduction port (43I), and the introduced gas (EGI) is mixed with the ions (CP) produced by the ion source (15).