Filter Container Fixing with Separated Sealing and Detachment Interfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing filter devices require strong force to detach the filter container, risking contamination and reducing analysis accuracy due to friction with the rubber plug or O-ring, as airtightness and fixing are established in the same part.
Innovation Solution
A filter device with a funnel, filter container, and elastic body, using a filter fixing tool that separates the airtightness establishment from the fixing point, allowing easy detachment with minimal force by pressing the filter container against the elastic body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter container is fixed using the same part that establishes airtightness (rubber plug or O-ring contact), then the airtightness is maintained, but strong force is required to detach the filter container, risking contamination and reducing analysis accuracy
Solution Approach 1:
The invention divides the filter container into two separate functional parts: an airtightness-establishing portion that contacts the rubber plug/O-ring, and a fixing portion that abuts against the filter fixing tool. This segmentation allows independent optimization of airtightness and fixing strength, enabling easy detachment without compromising airtightness.
Solution Approach 2:
The invention introduces a new dimensional aspect by adding a vertical abutting surface (fixing portion) to the filter container that extends beyond the lateral contact area with the rubber plug. This additional dimensional feature provides a new interface for the filter fixing tool to apply detachment force, separating the airtightness function from the fixing function.
2Measurement precision
If a small-diameter filter is used to improve concentration rate and detection sensitivity, then the analysis sensitivity is improved, but a large-diameter funnel creates an unstable shape requiring special fixing measures
Solution Approach 1:
The filter container is segmented into distinct functional zones: a large-diameter funnel portion for sample introduction, a small-diameter filtering portion for high concentration rate, and an abutting portion for stable fixing. This segmentation allows each part to optimize its function while maintaining overall structural stability.
Solution Approach 2:
The filter fixing tool acts as an intermediary that provides mechanical support to the unstable large-funnel/small-filter configuration. The tool's support surface abuts against the filter container's abutting portion, stabilizing the assembly during operation without interfering with the filtration function.
3Ease of operation
If the filter container is pulled out with strong force to overcome friction with the rubber plug, then the filter container can be detached, but the risk of contamination increases and analysis accuracy is reduced
Solution Approach 1:
By segmenting the filter container into separate airtightness and fixing portions, the invention enables detachment force to be applied to the fixing portion without transmitting stress to the filtering portion where collected samples are located. This prevents contamination while maintaining easy detachment.
Solution Approach 2:
The invention extracts the detachment function from the airtightness-establishing portion and relocates it to a dedicated fixing portion. This extraction allows the airtightness portion to remain undisturbed during detachment operations, preventing contamination of the collected samples.
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 easy attachment and detachment of the filter container with maintained airtightness, reducing contamination risk and improving analysis accuracy by separating the airtightness and fixing points.
Implementation Method 1
an elastic body 40 that has a through-hole 41 serving as a flow path for the sample that has passed through the filter 23
Implementation Method 2
the filter fixing tool 30 presses the filter container 20 against the elastic body 40 to hermetically seal the inlet periphery of the through-hole 41 in the elastic body 40 by means of a contact surface of the filter container 20 which corresponds to the inlet periphery
Data Source
Figure 1(A)~1(C)
Figure 2
Figure 3
AI summary
By separating the part where the airtightness is established between the filter container and the elastic body from the part where the filter container is fixed, the filter container is easily attached or detached with a small force while maintaining the airtightness between the filter container and the elastic body. The filter device includes: a funnel 10 having an inlet 11 through which the liquid sample is introduced and an outlet 12 having an opening area smaller than an opening area of the inlet 11; a filter container 20 to which a tip portion which includes the outlet 12 of the funnel 10 is inserted and a filter 23 that collects an object contained in the liquid sample; a rubber plug 40 having a through-hole 41 serving as a flow path for the liquid sample that has passed through the filter 23; and a filter fixing tool 30 that abuts on the filter container 20 to support the filter container 20 and that presses the filter container 20 against the rubber plug 40.