Liquid Ejection Head Connecting Throttle Channel Resistance
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Solution Overview
Problem
The existing liquid ejection heads have connecting channels with higher channel resistance than supply and return channels, which impede the effective dispersion of pressure waves, thereby compromising the stability of liquid ejection.
Innovation Solution
The liquid ejection head incorporates connecting throttle channels with resistance equal to or less than the individual throttle channels, allowing adjacent channels to communicate effectively and improve pressure wave dispersion, thereby enhancing ejection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If connecting channels are made with higher channel resistance than supply and return channels, then pressure wave leakage to common manifolds is reduced, but pressure wave dispersion is impeded and ejection stability deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the channel resistance characteristics in different parts of the fluid path. The connecting throttle channels are designed with resistance equal to or less than individual throttle channels, while supply and return throttle channels maintain higher resistance. This localized variation in resistance properties enables effective pressure wave dispersion through connecting channels while preventing excessive pressure wave propagation to common manifolds, thereby resolving the contradiction between reducing pressure wave leakage and maintaining ejection stability.
2Object-generated harmful factors
If connecting channels are made with higher channel resistance, then common channel interference is reduced, but pressure wave dispersion effectiveness is compromised
Solution Approach 1:
The patent employs parameter changes by adjusting the channel resistance parameter of connecting throttle channels to be equal to or less than that of individual throttle channels. This parameter optimization enables the connecting channels to effectively disperse pressure waves generated during ejection, preventing pressure wave accumulation and interference in common manifolds. The controlled resistance parameter ensures both effective pressure wave dispersion and reduced common channel interference, resolving the technical contradiction.
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
This design improves the stability of liquid ejection by ensuring that pressure waves are dispersed and propagated uniformly, reducing interference and turbulence, and preventing intensive pressure wave propagation to common manifolds, thus stabilizing the ejection performance.
Implementation Method 1
The connecting throttle channel has a channel resistance less than or equal to a channel resistance of each of the individual throttle channels... sufficiently improve the stability in liquid ejection... pressure waves are dispersed and propagated uniformly
Data Source
AI summary
A liquid ejection head includes a supply manifold, a return manifold, a plurality of individual channels, and a connecting throttle channel. The supply manifold includes a supply port through which liquid is supplied from an exterior. The return manifold includes a return port through which liquid is discharged to the exterior. Each individual channel is connected, at an upstream end thereof, to the supply manifold and, at a downstream end thereof, to the return manifold. Each individual channel communicates with a corresponding one of nozzles and includes an individual throttle channel Through the connecting throttle channel, adjacent ones of the individual throttle channels communicate with each other. The connecting throttle channel has a channel resistance less than or equal to a channel resistance of each individual throttle channel.