Bellows Pump Shock Vibration Suppression via Elastic Space
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Solution Overview
Problem
Bellows pumps generate shock vibrations during suction and discharge cycles, leading to potential damage and performance reduction, with existing countermeasures either reducing flow rate or increasing installation size and cost.
Innovation Solution
A bellows pump design featuring a fluorine resin-made bellows with an elastically deformable space portion between the bellows end and actuation plate, which absorbs pressure rises through elastic deformation, reducing vibration transmission without affecting flow rate or requiring additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If flow rate in the pipe is reduced to suppress vibration, then shock vibration is suppressed, but discharge amount of the pump is reduced
Solution Approach 1:
The patent introduces a cushioning space (air chamber) between the bellows and the actuation plate, which is sealed by an O-ring. This cushioning space absorbs pressure rises and shock vibrations before they propagate through the system. The air chamber acts as a buffer that compresses during pressure spikes, thereby suppressing water hammer effects without requiring reduction of the pump's discharge amount.
2Object-affected harmful factors
If an accumulator is added to absorb generated vibration, then shock vibration is relaxed, but installation place is made large and cost is increased
Solution Approach 1:
The patent merges the vibration absorption function into the existing bellows structure by creating a cushioning space within the bellows assembly itself. The air chamber is formed by the space between the bellows end and the actuation plate, sealed by an O-ring. This integration eliminates the need for separate accumulators or vibration absorption devices, thereby reducing installation space and device complexity while still effectively absorbing shock vibrations.
3Object-affected harmful factors
If an accumulator is added to absorb generated vibration, then shock vibration is relaxed, but cost is increased
Solution Approach 1:
The vibration absorption function is merged into the existing bellows assembly through the cushioning space design. This eliminates the need for separate accumulator components, reducing material costs, assembly costs, and maintenance costs. The O-ring sealing solution is a low-cost method to create the air chamber, making the overall solution economically advantageous compared to adding dedicated vibration absorption devices.
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 design effectively suppresses shock vibrations, maintaining pump performance while avoiding damage and cost increases, and is suitable for clean applications like semiconductor washing and medical solution supply.
Implementation Method 1
a space-facing portion 20 which faces the space portion 19 in the other end 2c is elastically deformably configured so as to enable the space portion 19 to expand and contract
Data Source
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AI summary
A bellows pump which is further improved so that, without causing performance reduction and increases of the installation place and the cost, shock vibration which is generated in the timing of switching between suction and discharge can be suppressed is provided. A bellows pump having: a pump body 1 including a suction path 12 and discharge path 13 for a fluid; a bellows 2 which is placed in a state where a basal end flange 2a is airtightly fixed to the pump body 1 to form a pump chamber 11 with respect to the pump body 1; and an actuation plate 15 which is attached to a head portion 2c of the bellows 2 so as to cause the bellows 2 to expand and contract with respect to the pump body 1 is configured so that an airtight-like space portion 19 is formed with respect to the actuation plate 15 by forming the head portion 2c into a raised bottom shape, and a pressure rise can be absorbed and relaxed by contraction of the space portion 19 caused by elastic film deformation of the thin head portion 2c which faces the space portion 19.