Diaphragm Pump Chamber for Leak-Free Dialysate Flow Control
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Solution Overview
Problem
Existing pump devices for dialysate in hemodialysis systems suffer from liquid leakage at sealing parts and require additional pumps for liquid delivery, complicating the control of flow rates.
Innovation Solution
A pump device with a chamber divided by a flexible dividing membrane, which is displaced alternately into two areas by a core member driven by a motor, eliminating the need for additional pumps and ensuring high accuracy in flow rate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reciprocating metering pump with pistons and cylinders is used, then liquid delivery is enabled, but liquid leakage occurs at the sealing part
Solution Approach 1:
The invention extracts the sealing problem by eliminating the traditional piston-cylinder sealing structure. Instead of using pistons that require sealing against cylinder walls, the patent uses a diaphragm that seals the chamber internally, separating the liquid chamber into first and second areas without requiring external sealing parts that are prone to leakage.
Solution Approach 2:
The invention applies a flexible diaphragm (thin film) to seal the liquid chamber and separate the first and second areas. The diaphragm deforms elastically to enable volume change for liquid delivery while maintaining reliable sealing, avoiding the liquid leakage issues associated with rigid piston-sealing arrangements.
2Ease of operation
If electromagnetic valves are used to control flow paths, then arbitrary timing control is enabled, but additional pumps are necessary
Solution Approach 1:
The invention merges the functions of multiple components into a single integrated system. The diaphragm chamber structure combines the liquid delivery function and flow path control function, eliminating the need for separate electromagnetic valves and additional pumps. The drive source directly actuates the diaphragm to control both volume change and flow direction.
Solution Approach 2:
The diaphragm chamber structure serves multiple functions simultaneously: it acts as the liquid delivery mechanism through volume change, provides flow path separation into first and second areas, and enables arbitrary timing control through drive source actuation. This multi-functionality eliminates the need for separate electromagnetic valves and additional pumps.
3Manufacturing precision
If additional pumps are used for liquid delivery, then flow rate control is enabled, but device complexity increases
Solution Approach 1:
The invention merges the flow rate control function into the single diaphragm chamber system. By controlling the volume change of the diaphragm chamber through the drive source, the flow rate is precisely controlled without requiring additional pumps. The same structural element that delivers liquid also controls its flow rate.
Solution Approach 2:
The diaphragm chamber structure performs multiple functions: liquid delivery, flow path control, and flow rate control accuracy. By making the system multi-functional, the patent eliminates the need for additional pumps while maintaining precise flow rate control through the volume change mechanism.
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 device provides a sealed and efficient liquid transfer mechanism with high accuracy, reducing manufacturing costs and eliminating the need for additional pumps and electromagnetic valves.
Implementation Method 1
a core member provided to the dividing membrane and configured to undergo a reciprocating motion inside the chamber with activation of a drive source and in such a manner as to displace the dividing membrane into the first area and into the second area
Data Source
AI summary
A pump device includes a chamber capable of accommodating a predetermined volume of liquid; a dividing membrane made of a flexible member attached to the chamber, the dividing membrane dividing an inside of the chamber into a first area and a second area, the dividing membrane being displaced alternately into the first area and into the second area to cause the liquid to be suctioned into and discharged from the first area and cause drain liquid to be suctioned into and discharged from the second area; and a core member provided to the dividing membrane and configured to undergo a reciprocating motion inside the chamber with activation of a motor and in such a manner as to displace the dividing membrane into the first area and into the second area.