Sterile Spray Pump with Filtered Air Supply
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Solution Overview
Problem
Conventional spray pumps have open structures that lead to medicinal liquid deterioration, contamination due to air exposure, and limited capacity and dosage stability, especially when using vacuum pumps.
Innovation Solution
A sterile spray pump design with a main piston, secondary piston, and filter element that allows external air supply, maintaining sterility and preventing contamination, while enabling full container usage without dosage reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an open spray head structure is used, then the spray pump structure is simple and easy to manufacture, but the medicinal liquid contacts with air directly causing deterioration and contamination
Solution Approach 1:
The patent introduces a filter element as an intermediary component between the medicinal liquid and the external air. The filter element allows air to pass through while blocking contaminants, thus mediating the interaction between the open spray head structure and the medicinal liquid to prevent contamination while maintaining structural simplicity
2Reliability
If a vacuum pump is used to achieve sterile spray, then the spray pump can maintain sterility, but the container capacity is limited to 2/3 and dosage becomes unstable when container is too large
Solution Approach 1:
The patent uses pneumatic principles by introducing air through a filter element to replace the vacuum pump mechanism. This allows the system to handle containers of any capacity without creating excessive negative pressure, maintaining stable dosage while achieving sterility through filtration rather than vacuum
3Ease of operation
If air return structure is added to supply external air, then the spray pump can work normally, but the medicinal liquid in container is polluted by direct air entry
Solution Approach 1:
The filter element serves as an intermediary in the air return structure, allowing external air to be supplied into the container for normal spray pump operation while blocking contaminants that would otherwise pollute the medicinal liquid
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
Ensures normal operation and sterility by using compression spaces and exhaust members for air exchange, allowing full container usage and preventing contamination, thus overcoming capacity and dosage limitations.
Implementation Method 1
a filter element covering the air supply port is fixedly provided in the air supply port
Implementation Method 2
a first compression space and a second compression space are formed between the secondary piston and the main piston
Data Source
AI summary
A sterile spray pump, including a main piston (30), a spray head (40), and a secondary piston (50) fixed inside the spray head (40) and mounted in a vertically movable manner on the main piston (30). A first compression space (10) and a second compression space (20) are formed between the secondary piston (50) and the main piston (30); a main liquid suction cavity (301) communicating with the inner cavity of a container and an air supply port (302) communicating with the main liquid suction cavity (301) are provided in the main piston (30); the air supply port (302) communicates with the second compression space (20), a filter element (601) is fixedly provided in the air supply port (302); the secondary piston (50) includes a secondary liquid suction cavity (501) communicating with the main liquid suction cavity (301), a first exhaust member (502), and a second exhaust member (503).