Hammer Mechanism Power Tool with Segmented Cooling and Suction Paths
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Solution Overview
Problem
The configuration of existing power tools with hammer mechanisms, such as hammer drills, often results in a pressure loss of air flows used for cooling the motor and generating suction power for dust collection, leading to reduced performance in both cooling and dust collection efficiency.
Innovation Solution
The power tool incorporates a dual-fan system with separate exhaust flow paths for the cooling and suction air flows, utilizing a baffle plate to prevent interference and maintain airflow velocity, and includes a baffle plate with ribs to enhance airflow separation and reduce pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two fans are used to generate air flow for cooling the motor and air flow for dust collection, then both cooling and dust collection functions are achieved, but the air flows collide and cause pressure loss reducing performance
Solution Approach 1:
The exhaust flow path is divided into a first exhaust flow path for the cooling air flow and a second exhaust flow path for the dust collection air flow. These separate paths prevent collision between the two air flows, eliminating pressure loss while maintaining both cooling and dust collection functions simultaneously.
2Device complexity
If air flow for cooling and air flow for dust collection are joined and discharged from a common exhaust port, then device complexity is reduced, but flow velocities decrease due to collision
Solution Approach 1:
Instead of using a common exhaust port, the invention provides separate first and second exhaust ports for the cooling and dust collection air flows respectively. This segmentation maintains high flow velocities by preventing collision, while the overall device complexity remains manageable through integrated flow path design.
3Reliability
If separate exhaust flow paths are provided for cooling and dust collection air flows, then pressure loss is suppressed and performance is maintained, but device complexity increases
Solution Approach 1:
The exhaust flow path is segmented into separate first and second paths that diverge after the fans and lead to different exhaust ports. This segmentation ensures reliable cooling and dust collection performance by preventing air flow collision, while the paths are integrated into the housing structure to minimize overall complexity.
Solution Approach 2:
Different regions of the housing are assigned different flow path characteristics - the first exhaust flow path is optimized for cooling air flow while the second exhaust flow path is optimized for dust collection air flow. This local optimization maintains high reliability without requiring complete system redesign.
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 effectively suppresses pressure loss, maintaining the cooling efficiency of the motor and the suction power of the dust collector, thereby enhancing overall performance without increasing the number of components.
Implementation Method 1
The first fan is connected with a second end part of the rotating shaft and configured to rotate with the rotating shaft and blow the air in a centrifugal direction, so as to generate a first air flow that serves to cool down the motor
Implementation Method 2
The second fan is stacked on the first fan via a middle wall portion in an axial direction of the rotating shaft and configured to rotate with the first fan and blow the air in the centrifugal direction, so as to generate a second air flow that serves to generate the suction power
Data Source
AI summary
A power tool having a hammer mechanism, including: a connecting part connectable with a dust collector, and with a connection flow path to suck in the air from the dust collector to generate a suction power in the dust collector; a motor with a rotating shaft; a first fan to rotate with the rotating shaft and generate a first air flow to cool down the motor; a second fan to rotate with the first fan and generate a second air flow to generate the suction power; a housing with a first exhaust port to discharge the first air flow and a second exhaust port to discharge the second air flow; a first exhaust flow path to guide the first air flow to the first exhaust port; and a second exhaust flow path separated from the first exhaust flow path to guide the second air flow to the second exhaust port.