Lotion Pump Slope Seal Prevents Water Ingress
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Solution Overview
Problem
Existing lotion pumps allow water to seep into containers during showering and tubbing, contaminating personal care products, especially problematic for infant care due to the risk of skin issues from degraded products.
Innovation Solution
An anti-water-ingress lotion pump design featuring a neck sleeve with a first and second slope configuration that forms a seal in the standby state to prevent water ingress and allows air intake during use, ensuring the product remains dry and preventing negative pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an air replenishment channel is provided in the lotion pump, then negative pressure inside the container is prevented, but water can seep into the container through the air replenishment channel during bathing
Solution Approach 1:
The air replenishment channel is designed to dynamically switch between open and closed states. During normal use, the channel is open to allow air intake and prevent negative pressure. During water exposure (showering or accidental immersion), the channel automatically closes to prevent water ingress, thus resolving the contradiction between maintaining atmospheric pressure and preventing water contamination.
Solution Approach 2:
The patent changes the state parameter of the air replenishment channel from static to dynamic. By controlling the opening and closing of the channel based on operational conditions, the system adapts its permeability parameter to prevent water ingress while maintaining air flow capability during normal operation.
2Ease of operation
If a gap is provided where the pressing head mates with the threaded sleeve, then air can flow into the lotion pump during bathing, but water is likely to seep into the lotion pump through the gap
Solution Approach 1:
The patent applies different functional qualities to different regions of the pressing head assembly. The sealing surface between the pressing head and threaded sleeve is designed with specific local properties (smooth, continuous contact surface) to prevent water seepage, while the air replenishment channel provides localized air flow capability without compromising the overall seal integrity.
3Ease of manufacture
If the lotion pump is designed with conventional structure, then manufacturing is simple, but water ingress occurs during showering and tubbing
Solution Approach 1:
The patent segments the pressing head assembly into distinct functional components: a pressing head body, a neck sleeve with sealing features, and a threaded sleeve with air replenishment channel. This segmentation allows each component to be optimized for its specific function (sealing, air flow, structural support) while maintaining relative manufacturing simplicity through modular design.
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
Effectively prevents water from entering the container during both showering and accidental immersion, maintaining product integrity and safety, especially for infant care products.
Implementation Method 1
a maximum outer diameter of the first part of the neck sleeve is greater than a minimum inner diameter of the cylinder head at the second slope, so that when the lotion pump is in a standby state or an upper locked state, there is an interference fit between the first slope and the second slope to form a seal between the cylinder head and the neck sleeve
Data Source
AI summary
Disclosed is a lotion pump comprising: a pressing head (10) comprising a pressing head body (11); a cylinder (30); a cylinder head connected to an upper end of the cylinder and having an inner hole; a threaded sleeve (20) connected to the cylinder head; and a piston rod (40), with one end being connected to the pressing head body, and the other end extending into the cylinder and being provided with a piston (50). The lotion pump further comprises a neck sleeve (13) formed on the pressing head body. A first slope is formed on a lower portion of the neck sleeve, and a second slope matching the first slope is formed on the top of the threaded sleeve. The lotion pump having the foregoing structure can ensure the sealing against the outside when the lotion pump is in a standby state or an upper locked state, so as to prevent water from seeping into the lotion pump during bathing.