Floor Spring Mixed Powder Sealing for Contamination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional automatic door closers with floor springs face contamination issues due to water and dust accumulation in the gap between the damper assembly and its case, posing safety and maintenance hazards.
Innovation Solution
A waterproof and dust-proof floor spring design featuring a case with a mixed powder filling, comprising 90% light calcium carbonate, 4% talc powder, 2% hard calcium carbonate, 1% calcium stearoyl, 1% antiseptic, and 1% antioxidant, which covers the damper assembly and includes a seal member to prevent ingress of water, dust, and insects, while maintaining the hydraulic oil's functionality in low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a gap is spared between damper assembly and case to facilitate assembly, then ease of manufacture is improved, but water and dust may enter and accumulate in the gap causing contamination and safety hazards
Solution Approach 1:
A seal member is introduced as an intermediary element between the damper assembly and the case. This seal member fills the gap that would otherwise allow water and dust to enter, while still permitting the damper assembly to be installed. The seal member thus mediates between the need for assembly clearance and the need to prevent contamination.
Solution Approach 2:
The seal member functions as a flexible barrier that can deform to accommodate the damper assembly during installation while maintaining its sealing function. This flexible element prevents water and dust from entering the gap between the rigid case and the damper assembly.
2Adaptability or versatility
If the case is imbedded in the floor for installation, then adaptability to door installation is improved, but water and dust can accumulate in the gap between damper assembly and case
Solution Approach 1:
The seal member serves as a protective intermediary that allows the case to remain imbedded in the floor for proper door installation while preventing the harmful effects of water and dust accumulation in the resulting gap.
3Reliability
If mixed powder is added to fill the space inside the case to prevent contamination, then reliability is improved, but device complexity increases
Solution Approach 1:
The mixed powder creates an inert, protective environment inside the case that prevents water and dust from contacting the damper assembly. The powder mixture, consisting of calcium carbonate, talc, and other protective substances, forms a barrier that protects internal components without requiring complex sealing mechanisms.
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 effectively prevents contamination, reduces the risk of rust and failure, and ensures the hydraulic oil does not freeze in low temperatures, enhancing the reliability and longevity of the door closer mechanism.
Implementation Method 1
mixed powder filling a space inside the case covering the damper assembly
Implementation Method 2
includes a seal member to prevent ingress of water, dust, and insects
Implementation Method 3
reduces the risk of rust and failure
Implementation Method 4
ensures the hydraulic oil does not freeze in low temperatures
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A floor spring includes a case, a damper assembly received in the case, and mixed powder filling a space inside the case covering the damper assembly. The damper assembly includes a spindle extending outwardly from the case. The mixed powder can prevent water, dust, or insects enter the case, such that the damper assembly is not tend to rust or fail.