Hand Air Pump Integrating Large and Small Pumps
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Solution Overview
Problem
Existing hand air pumps face inefficiency in inflating inflatable products, as they require a large pump for initial inflation and a small pump for high-pressure stages, leading to inconvenient switching between modes.
Innovation Solution
A hand air pump design integrating a large pump and a small pump with a switch mechanism, allowing users to choose the mode based on inflating conditions, featuring a slider-adjustable switch mechanism for easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large pump is used for initial inflation, then inflation speed is improved, but operation difficulty increases due to high resistance force
Solution Approach 1:
The pump integrates two different pump chambers (large and small) that can be dynamically switched between based on inflation needs. The large pump chamber provides high inflation speed initially, while the small pump chamber handles high-pressure finishing, making the pump adaptable to different operation stages and reducing operation difficulty.
Solution Approach 2:
The pump is divided into two separate pump chambers - a large pump chamber for initial inflation and a small pump chamber for high-pressure inflation. This segmentation allows each chamber to be optimized for its specific function, with the large chamber providing high volume displacement and the small chamber providing high pressure, thereby resolving the contradiction between inflation speed and operation ease.
2Ease of operation
If a small pump is used for high-pressure inflation, then operation ease is improved, but inflation speed decreases
Solution Approach 1:
The pump allows dynamic switching between small and large pump chambers based on the inflation stage. During high-pressure inflation when operation ease is prioritized, the small pump chamber is used. When inflation speed becomes the priority during initial stages, the large pump chamber is engaged, thus resolving the contradiction between operation ease and inflation speed.
Solution Approach 2:
The pump system is segmented into two functional chambers that can be independently selected. The small pump chamber is optimized for ease of operation during high-pressure stages, while the large pump chamber is optimized for inflation speed during initial stages. This segmentation resolves the contradiction by allowing the user to select the appropriate chamber for each inflation phase.
3Device complexity
If a single pump is used, then device complexity is reduced, but adaptability decreases
Solution Approach 1:
The pump merges two different pump chambers (large and small) into a single integrated device with a unified handle and switching mechanism. This merging maintains relatively simple device structure while providing adaptability to handle both initial inflation (large chamber) and high-pressure inflation (small chamber), thus resolving the contradiction between device complexity and inflation adaptability.
Solution Approach 2:
The pump achieves multi-functionality by integrating two pump chambers that can be switched between based on inflation needs. The single pump device can adapt to different inflation stages and requirements, providing both high-speed initial inflation and high-pressure finishing inflation, thereby resolving the contradiction between device simplicity and adaptability.
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
Enables efficient inflation by allowing users to switch between large and small pump modes according to the inflating condition, improving convenience and ease of use through a simple and effective switch mechanism.
Implementation Method 1
a piston (90) mounted on a bottom end of the inner cylinder and matched with an inner wall of the outer cylinder
Implementation Method 2
a one-way valve (31) mounted on the bottom end of the inner cylinder
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A hand air pump is provided with a main body (10) including a base (11) and a top cover (12); an outer cylinder (20) including a cavity (21), a plurality of second air intake holes (22), and a second circular hole (23); an inner cylinder (30), a handle (40), an air tube (50), and a switch mechanism (60). A first air chamber (70) is formed between the outer cylinder (20) and the main body (10) and communicates with the first air intake hole (122). A second air chamber (80) is formed between the inner cylinder (30) and the outer cylinder (20) and communicates with the second air intake holes (22). Therefore, the switch mechanism (60) switches between the large pump and the small pump, and convenience of inflating is improved.