Trigger Dispensing Head Venting Seal to Prevent Product Leakage
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Solution Overview
Problem
Trigger dispensing devices face issues with product leakage through the venting duct during transport and storage, especially when subjected to impacts and improper handling.
Innovation Solution
The dispensing head incorporates a labyrinth seal and a fixed sleeve position within the cylinder chamber to create a high seal against product leakage, along with a bi-injected sealing ring and a bottom lip to further enhance sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the venting duct is opened to allow air entry during suction, then the suction function is improved, but product leakage occurs during transport and storage
Solution Approach 1:
The patent applies preliminary action by pre-positioning a seal member within the venting duct before the device is activated. This seal member is strategically placed to automatically seal the duct when the device is in transport or storage mode, preventing product leakage in advance. When the device is activated, the seal member is displaced to open the duct, allowing air entry for proper suction function. This preliminary sealing arrangement resolves the contradiction by preparing the system to prevent leakage while maintaining suction capability when needed.
Solution Approach 2:
The patent implements dynamics by making the venting duct sealable and openable based on operational state. The venting duct is equipped with a movable seal member that can transition between sealed and open positions. In transport or storage mode, the duct remains sealed to prevent leakage. During operation, the duct opens to allow air entry for suction. This dynamic configuration resolves the technical contradiction by adapting the venting duct's state according to the device's operational requirements.
2Ease of manufacture
If the device is packaged in standard-sized boxes for online commerce, then shipping convenience is improved, but the device is subjected to impacts and crushing causing leakage
Solution Approach 1:
The patent applies beforehand cushioning by incorporating a sealable venting duct with an automatically activating seal mechanism. This seal acts as a protective measure that is already in place before the device undergoes transport impacts. When subjected to shocks or pressure changes during shipping in standard boxes, the sealed venting duct prevents product leakage that would otherwise occur due to impacts and crushing. This preliminary protective sealing resolves the contradiction between shipping convenience and device integrity.
3Object-generated harmful factors
If a seal is added to prevent leakage, then leakage prevention is improved, but the suction function may be compromised
Solution Approach 1:
The patent resolves this contradiction through dynamics by implementing a movable seal member in the venting duct that can transition between sealed and open states. The seal member is positioned and configured to seal the venting duct during transport, preventing leakage. During suction operation, the seal member is displaced to open the duct, allowing air entry necessary for proper suction function. This dynamic sealing mechanism ensures that the seal does not permanently compromise suction capability while effectively preventing leakage when the device is not in use.
Solution Approach 2:
The patent applies preliminary action by pre-positioning the seal member in a default sealed state within the venting duct. This preliminary sealing arrangement prevents leakage during transport and storage before the device is activated. When the device is activated for suction, the seal member is displaced from its preliminary position to open the duct, allowing air entry. This preliminary sealing approach resolves the contradiction by establishing leakage prevention in advance while maintaining the capability to enable suction function when needed.
Data Source
Figure 1
Figure 2a
Figure 2b~2c
AI summary
A trigger dispensing head (4) applicable to a bottle of a trigger dispensing device comprises a cylinder chamber (14), a main vent passage (26), a sleeve (30), a secondary vent passage (50), a piston (80), a suction duct, a dispensing duct and a labyrinth seal (35) suitable for placing the main vent passage (26) in fluidic connection with the external environment, obtained on either the external surface (32a) of the sleeve (30) or the internal surface (24b) of the cylinder chamber (24).