Double-Bulkhead Darkroom Structure for Smoke Detector Flow Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing photoelectric smoke detectors with a wedge structure exhibit asymmetric flow characteristics and low gas flow velocities, leading to increased particle deposition due to varying inflow angles, which affects detection accuracy and increases the probability of particle adhesion.
Innovation Solution
A photoelectric smoke detector with a double-bulkhead structure is designed, featuring an outer bulkhead with an inclined internal flow guide portion and rounded edges, which increases the distance between bulkheads and accelerates gas flow by reducing pressure drop, ensuring uniform flow characteristics and high-concentration particle distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wedge structure is used in the darkroom, then the structure can block light effectively, but the gas flow velocity decreases and asymmetric flow characteristics occur depending on inflow angles
Solution Approach 1:
The single bulkhead structure is segmented into an outer bulkhead and an inner bulkhead, creating a double-bulkhead configuration. This segmentation allows the light-blocking function to be distributed while creating a more favorable flow path between the two bulkheads, thereby maintaining light blocking effectiveness while improving gas flow velocity and reducing asymmetric flow characteristics.
Solution Approach 2:
The invention transitions from a single-plane bulkhead to a multi-dimensional double-bulkhead structure with spaced-apart outer and inner bulkheads. This dimensional change creates a three-dimensional flow path that reduces flow resistance and minimizes the impact of inflow angles, thereby improving gas flow velocity while maintaining light blocking capability.
2Ease of manufacture
If the darkroom structure is simplified, then manufacturing becomes easier, but particle deposition increases due to low flow velocity regions
Solution Approach 1:
The bulkhead is divided into an outer bulkhead and an inner bulkhead that are relatively simple in shape but work together to create improved flow characteristics. This segmented approach maintains manufacturing simplicity while the spatial relationship between the two bulkheads eliminates low flow velocity regions, reducing particle deposition probability.
Solution Approach 2:
The outer bulkhead includes a rounded portion at its end, and the inner bulkhead is positioned to receive flow from this rounded portion. This curvature design smooths the flow path, preventing turbulence and low velocity regions that would cause particle deposition, while still maintaining relatively simple manufacturing requirements.
3Volume of moving object
If the bulkheads are placed close together, then the device size is reduced, but pressure drop increases and flow velocity decreases
Solution Approach 1:
The outer bulkhead includes a rounded portion that preliminarily conditions the flow before it reaches the inner bulkhead. This preliminary flow conditioning action reduces turbulence and pressure drop in the space between bulkheads, allowing for closer placement while maintaining acceptable flow velocity and minimizing energy loss.
Solution Approach 2:
The rounded portion of the outer bulkhead creates a smooth, curved flow path that reduces pressure drop. This curvature allows the bulkheads to be placed closer together while maintaining adequate flow velocity, thereby reducing the overall device size without significantly increasing energy loss.
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 double-bulkhead structure maintains a higher gas flow velocity, reduces particle deposition, and enhances detection performance by minimizing the influence of inflow direction on internal flow characteristics, resulting in a more reliable and efficient smoke detection system.
Implementation Method 1
a light emitting element for emitting light into the base and a light receiving element for receiving light, which is emitted by the light emitting element and scattered by smoke particles
Data Source
AI summary
The present invention relates to a photoelectric smoke detector having a double-bulkhead darkroom structure and, more particularly, to a photoelectric smoke detector having a double-bulkhead darkroom structure, comprising: a base having, on one side thereof, a light emitting element receiving part in which a light emitting element for irradiating light to the inside thereof is mounted and, on the other side thereof, a light receiving element part in which a light element for receiving scattered light generated by smoke particles from the light irradiated by the light emitting element is mounted; an outer bulkhead which protrudes toward a lower side of the base to form an outer wall of the smoke detector and in which a smoke inlet having a specific height is formed in a circumferential direction; a lower end surface coupled to a lower end of the outer bulkhead; and an inner bulkhead which protrudes from the lower end surface to an upper side, is disposed to be spaced apart from the outer bulkhead at a specific interval, and is formed to have a height smaller than the height of the outer bulkhead so as to form a gas flow area in an upper portion thereof, wherein smoke flows in through the smoke inlet and passes through a space between the outer bulkhead and the inner bulkhead, and the gas flow area.