Segmented Valve Rod for Pump Nozzle Sealing
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Solution Overview
Problem
In depression head type discharge pumps, atmospheric air flows back into the pump, causing content drying and solidification, which hampers smooth discharge and can deteriorate the quality of the content due to friction-induced delays in nozzle closure.
Innovation Solution
A depression head design with a valve rod member divided into a base and tip portion, where a second bias means is used to ensure quick sealing of the nozzle valve by the tip portion, preventing air inflow and maintaining a liquid-tight seal, even under negative pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the head body is elevated to shut the nozzle after piston reaches lower limit position, then the valve shuttling function is achieved, but friction resistance causes time delay allowing air to flow back into the pump
Solution Approach 1:
The valve rod member is divided into a base portion and a tip portion that can move independently. The tip portion responds directly to pressure changes to shut the nozzle, while the base portion moves with the head body. This segmentation allows the sealing action to occur independently and immediately when pressure differential arises, eliminating the time delay caused by friction in the overall valve mechanism.
2Device complexity
If the valve rod member is formed as a single piece, then the structure is simple, but the response speed to pressure changes is slow due to friction in the valve mechanism
Solution Approach 1:
The valve rod member is segmented into a base portion (58) and a tip portion (66) that can move independently relative to each other. The tip portion, which directly contacts the valve seat (35), responds immediately to pressure changes by moving forward to seal the nozzle. The base portion moves with the head body during normal operation. This segmentation isolates the critical sealing action from the friction-induced delays of the overall valve mechanism.
3Object-affected harmful factors
If atmospheric air flows back into the pump, then the content in the cylinder dries and solidifies, but this is a consequence rather than a controllable parameter
Solution Approach 1:
The tip portion of the valve rod member is designed to shut the nozzle valve in advance before atmospheric air can flow back into the pump. When the piston reaches the lower limit position and pressure in the cylinder decreases, the pressure differential immediately acts on the tip portion to seal the nozzle, preventing air ingress. This preliminary sealing action counteracts the harmful effect of air inflow before it can occur.
4Ease of manufacture
If the tip portion of the valve rod member is made separately from the base portion, then assembly operation is facilitated, but additional bias means are required
Solution Approach 1:
The first bias means (62) serves dual functions: it biases the base portion forward and simultaneously provides the biasing force for the tip portion through the engagement portion (64). This merging of biasing functions into a single component achieves the segmented valve rod structure with improved manufacturability and assembly ease, while avoiding the need for additional separate biasing 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
Prevents air inflow, maintains content quality, and ensures smooth operation by ensuring the nozzle is sealed quickly and securely, reducing friction-induced delays and solidification issues.
Implementation Method 1
a first bias means 62 for forwardly biasing the base portion 58
Implementation Method 2
a second bias means 70 for forwardly biasing the tip portion 66 against the base portion 58
Implementation Method 3
when the internal pressure of the cylinder portion 30 is increased, to release the tip portion 66 from the valve seat 35 against the bias force of the second bias means 70, and to shut the valve seat 35 when the internal pressure of the cylinder portion 30 is decreased
Data Source
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AI summary
The present invention provide a depression head type discharge pump with a nozzle being open and shut by forward and backward displacements of the valve rod member by means of a lever member and a first bias member, wherein a second bias means is interposed between base and tip portions of the valve rod member to prevent the air from flowing back. A depression head for a pump comprises a head body 24 having a liquid conduit 36 communicating with a stem 6 of a discharge pump and hanging from a lower face of a transverse cylinder portion 30 provided with a nozzle 34 opened at its leading edge portion, and is constructed so that a valve rod 52 provided in the cylinder portion 30 is displaced backwardly and forwardly when the head body 24 is depressed; the valve rod member 52 is formed by a base portion 58 and a tip portion 66; and a second bias means 70 is interposed between the base portion 58 and the tip portion 66.