Low Vibration Pump with Integrated Pulsation Absorbing Chamber
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Solution Overview
Problem
Conventional reciprocating liquid pumps with pulsation absorbing units are complex and large, making them unsuitable for small-sized pumps with short reciprocation periods, as they struggle to effectively absorb high-frequency pulsations.
Innovation Solution
A low vibration pump design featuring a liquid pump unit with an electric rotary motor, eccentric cam, and connecting rod, combined with a pulsation absorbing unit that includes a spring-biased diaphragm to absorb high-frequency pulsations, allowing for downsizing while maintaining effective pulsation absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pulsation absorbing unit is used in a reciprocating liquid pump, then pulsation can be absorbed, but the structure becomes complicated and the size increases
Solution Approach 1:
The pulsation absorbing unit is integrated with the pump housing to form a unified structure. The pulsation absorbing chamber is formed within the housing itself, eliminating the need for separate pulsation absorption devices and reducing overall structural complexity while maintaining pulsation absorption functionality.
Solution Approach 2:
The pump housing serves multiple functions: it contains the pump chamber, provides structural support, and incorporates the pulsation absorbing chamber. This multi-functionality reduces the number of separate components needed, simplifying the overall structure while maintaining both pumping and pulsation absorption capabilities.
2Reliability
If a conventional pulsation absorbing unit is used in a reciprocating liquid pump, then pulsation can be absorbed, but the size becomes large
Solution Approach 1:
The pulsation absorbing chamber is nested within the pump housing structure. By utilizing the space within the existing housing boundaries and forming the pulsation absorbing chamber as an integrated part of the housing, the design achieves compact dimensions without compromising pulsation absorption effectiveness.
3Productivity
If the reciprocation period is shortened to increase pumping speed, then productivity increases, but the pulsation absorbing unit becomes ineffective
Solution Approach 1:
The pulsation absorbing chamber is designed with dynamic characteristics that allow it to respond to high-frequency pulsations generated during rapid reciprocation. The chamber volume and configuration are optimized to provide effective pulsation absorption across a range of operating frequencies, maintaining effectiveness even when reciprocation period is shortened for increased productivity.
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 solution enables proper absorption of high-frequency pulsations, allowing the pump to operate at high frequencies without reducing rotational speed and enables downsizing of the pulsation absorbing unit, resulting in a compact and efficient pump.
Implementation Method 1
a spring member biasing the second diaphragm toward the pulsation absorbing chamber
Implementation Method 2
the second diaphragm can properly absorb the pulsation
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
There is provided a liquid pump in which pulsation can be properly absorbed even if the pump is driven at a high frequency. A pulsation absorbing unit 14 for absorbing pulsation includes a pulsation absorbing housing 44 disposed on a pump housing member, a second diaphragm 48 attached to the pulsation absorbing housing member and defining a pulsation absorbing chamber 46 communicating with a liquid outlet passage 32 of a liquid pump unit, and a disc spring 50 for biasing the second diaphragm toward the pulsation absorbing chamber. Selected Figure; Fig.1