Syringe Pump Cover Member Segmentation for Compact Chassis Design
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Solution Overview
Problem
The existing syringe pumps have a large chassis due to the elongated contracted state of the bellows-shaped cover member, which increases the distance between the syringe pusher driving part and the housing, limiting the downsizing of the device.
Innovation Solution
A syringe pump design featuring a cover member with alternating first and second protruded parts of different diameters, allowing for a reduced contracted length and storage of the cover member within the moving member, thereby minimizing the distance between the syringe pusher driving part and the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the cover member is designed with uniform ridge parts to ensure long extension length, then the extension capability is improved, but the contracted length becomes excessively long, increasing the chassis size
Solution Approach 1:
The cover member is divided into multiple ridge parts with different outline dimensions. Specifically, alternating ridge parts have different diameters (first ridge parts with larger diameter, second ridge parts with smaller diameter), creating a segmented structure that allows more efficient packing during contraction while maintaining extension capability.
Solution Approach 2:
The ridge parts are designed with asymmetric dimensions where alternating ridge parts have different outline dimensions. This asymmetric design allows the cover member to contract more compactly by creating varying compression zones, reducing the overall contracted length compared to uniform ridge designs.
2Length of moving object
If the cover member is made longer to accommodate the slider movement, then the slider movement range is improved, but the distance between the moving member and housing part increases, requiring a larger chassis
Solution Approach 1:
The segmented ridge structure allows the cover member to compress more efficiently during slider movement. By having alternating ridge parts with different dimensions, the cover can compactly store the slider's movement range within a shorter axial length, reducing the distance required between the moving member and housing part.
Solution Approach 2:
The outline dimension parameter of the ridge parts is varied along the length of the cover member. By changing the diameter parameter of alternating ridge parts, the cover achieves variable compression characteristics that maximize movement range accommodation while minimizing the overall contracted length.
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 design enables a more compact syringe pump chassis while maintaining the necessary movement range for the syringe pusher, allowing for the use of syringes with capacities from 2.5 mL to 50 mL.
Implementation Method 1
the cover member is pushed by the slider and is elastically deformed and contracted
Data Source
Figure 1
Figure 2
Figure 3(A)~3(C)
AI summary
A syringe pump in which it is possible to reduce a length of a cover member of when the cover member is contracted and to reduce a distance between a moving member of a syringe pusher driving part and a housing part of when the moving member becomes the closest to a side of the housing part and which can be downsized is provided. A syringe pusher driving part 7 includes a boot 800 included as a cover member which covers a feed screw 135 and which can be elastically deformed and contracted as a syringe pusher pushing member 10 moves to a side of a syringe body 201. The boot 800 includes a plurality of first protruded parts 811 to 816 and at least one second protruded part 821 or 822 formed between two successively-formed first protruded parts and next two successively-formed first protruded parts. An outer diameter dimension DG1 of a connection part 990 between the two successively-formed first protruded parts is set smaller than an outer diameter dimension DG2 of a connection part 995 between the second protruded part and the first protruded part.