Hand Pump Sealing Arrangement with Adjustable Coupling Cap
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Solution Overview
Problem
Conventional hand pumps experience oil leakage at the joint between the handle and pump housing after long-term use due to wear and tear, leading to inefficiencies in fluid discharge.
Innovation Solution
A hand pump design featuring a pump body with connectors, a piston assembly, a driving mechanism, and a sealing arrangement that includes multiple sealing gaskets and a coupling cap to maintain an effective seal, allowing for the restoration of the seal by adjusting the coupling cap when the first sealing gaskets wear out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-seal design is used, then the structure is simple, but the seal fails after long-term use causing leakage
Solution Approach 1:
The sealing arrangement is divided into multiple independent sealing gaskets (first sealing gasket, second sealing gasket, third sealing gasket) positioned at different locations. This segmentation allows each gasket to independently perform sealing functions, and if one wears out, the others continue to provide sealing, thus resolving the contradiction between reliability and complexity.
Solution Approach 2:
The coupling cap is designed with an adjustable pressing mechanism that can be tightened to restore sealing pressure on the third sealing gasket when it shows signs of wear. This preliminary action allows the seal to be restored without complete replacement of the sealing system, extending the service life and maintaining reliability.
2Ease of repair
If the coupling cap is made tightly fixed, then the seal is initially effective, but it cannot be adjusted when sealing wears out
Solution Approach 1:
The coupling cap transitions from a static fixed structure to a dynamic adjustable structure. The cap can be rotated or tightened to increase pressing force on the third sealing gasket, allowing the sealing pressure to be restored as the sealing surfaces wear. This dynamic adjustment capability enables repair without replacing the entire pump assembly.
3Duration of action of stationary object
If multiple sealing gaskets are used, then the seal durability is improved, but the manufacturing complexity increases
Solution Approach 1:
The sealing system is segmented into three distinct gaskets that can be manufactured separately using standard sealing gasket production methods. Each gasket is a simple radial or axial seal that can be produced independently, allowing for modular manufacturing and assembly, which mitigates the increase in manufacturing complexity while extending sealing lifespan.
Data Source
AI summary
A hand pump for pumping out fluid from a reservoir, comprising a pump body, a faucet, a driving mechanism and a sealing arrangement. The pump body has at a side a connector defining a receptacle radially extending into a cavity of the pump body. The driving mechanism includes an axle inserted in the receptacle of the connector, a sealing sleeve mounted around the axle, a coupling cap axially secured to the sealing sleeve, and a L-shaped handle. The handle having at one end inserted through the coupling cap and the axle, and at the other hand extending outside the coupling cap. Operation of the handle in cyclically up and down motion drives the axle to rotate, which causes a piston in the cavity to move upward and downward so as to suck the fluid into the faucet. The sealing arrangement has at least three O-rings disposed among the parts of the driving mechanism to provide an effective seal between the driving mechanism and the pump body.