Valve Accelerating Dispensing Pump for High Viscosity Resin
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Solution Overview
Problem
Existing dispensing pumps face limitations in dispensing liquids with high viscosity at high speeds due to structural constraints, particularly in the underfill process of semiconductor manufacturing, where the speed of the valve rod descent affects the efficiency and accuracy of resin dispensing.
Innovation Solution
A valve accelerating type dispensing pump is designed with a cam member featuring inclined cam protrusions and a cam follower with rollers that interact to enhance the descending speed of the valve rod, utilizing an elastic member and accelerating member to increase the rotational range and speed of the cam follower, allowing for faster dispensing of high viscosity liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional cam and cam follower structure is used, then the pump can dispense liquid, but the valve rod descent speed is limited and cannot dispense high viscosity liquid at high speed
Solution Approach 1:
The cam follower is designed to rotate relative to the cam member during operation, transforming the conventional static follower structure into a dynamic one. This relative rotation allows the follower to better track the cam profile and increases the valve rod descent speed, enabling high viscosity liquid dispensing at high speed while maintaining structural feasibility
Solution Approach 2:
The cam follower is divided into multiple rollers arranged circumferentially, with each roller contacting a different portion of the cam profile. This segmentation allows parallel interaction with multiple cam surfaces, effectively multiplying the descent speed while distributing the mechanical stress across multiple contact points
2Speed
If the cam follower is fixed without rotation capability, then the structure is simple, but the descending speed of the valve rod is limited
Solution Approach 1:
The cam follower is designed to rotate relative to the cam member during operation, transforming the conventional static follower structure into a dynamic one. This relative rotation allows the follower to better track the cam profile and increases the valve rod descent speed, enabling high viscosity liquid dispensing at high speed while maintaining structural feasibility
Solution Approach 2:
Multiple cylindrical rollers are arranged circumferentially on the cam follower, creating a curved contact interface with the cam member. This spherical/curved arrangement allows smooth relative rotation and continuous contact throughout the cam profile, enhancing speed while maintaining operational simplicity
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
The pump achieves a higher descending speed of the valve rod, enabling efficient and accurate dispensing of high viscosity liquids at increased speeds, improving the dispensing range and efficiency compared to conventional pumps.
Implementation Method 1
an elastic member installed between the pump body and the accelerating member and providing an elastic force to the accelerating member so that the accelerating member approaches the cam member
Implementation Method 2
a cam follower including rollers that roll on the inclined surfaces of the cam protrusions when the cam member rotates
Implementation Method 3
a valve rod pressurizing the liquid stored in the reservoir of the valve body and inserted in the reservoir of the valve body so that the liquid is discharged via the discharge path
Data Source
AI summary
A dispensing pump, and more particularly, a valve accelerating type dispensing pump that may be used in a process of manufacturing an electronic product and may dispense an accurate amount of a liquid, such as a liquid synthetic resin, at high speed. The valve accelerating type dispensing pump can descend a valve rod at high speed and thus can dispense a liquid with high viscosity at high speed. The valve accelerating type dispensing pump can dispense an accurate amount of a liquid at high speed. Also, the valve accelerating type dispensing pump can dispense a liquid having high viscosity at high speed due to a fast descending speed of a valve rod.