Hammer Mechanism Power Tool With Segmented Cooling and Dust Exhaust
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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 first fan and a second fan, each generating separate air flows that are guided through distinct exhaust paths to prevent interference, with a baffle plate separating and directing these flows to minimize pressure loss and enhance cooling and suction power.
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 first air flow (cooling) and a second exhaust flow path for the second air flow (dust collection). These separate paths prevent the air flows from colliding and cause pressure loss, while both functions are maintained through the segmented exhaust system.
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 affecting performance
Solution Approach 1:
The exhaust system is segmented into separate exhaust flow paths (first exhaust flow path and second exhaust flow path) that remain distinct until discharge. This segmentation maintains high flow velocities by preventing collision, while the exhaust ports are positioned to minimize overall device complexity.
3Loss of energy
If separate exhaust flow paths are used for first air flow and second air flow, then pressure loss is suppressed and performance is maintained, but device complexity increases
Solution Approach 1:
The exhaust flow path is divided into a first exhaust flow path and a second exhaust flow path that are separated from each other. This segmentation prevents air flow collision and pressure loss while maintaining a relatively simple overall structure through efficient spatial arrangement.
Solution Approach 2:
The first and second exhaust flow paths are arranged in different spatial dimensions and directions, allowing separate exhaust flows to coexist without interference. This dimensional separation maintains performance while avoiding excessive complexity in the exhaust system design.
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 maintains effective motor cooling and dust collection performance by preventing air flow interference, thus enhancing the overall operational efficiency of the power tool.
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.