Plunger Pump Cleaning Groove Structure for Stable Piston Sealing
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Solution Overview
Problem
The sealing portion of the piston in a plunger pump is unstable during cleaning, leading to potential damage or loss of sealing members due to positional changes or misalignment.
Innovation Solution
A plunger pump design with a tubular cylinder featuring a body and cleaning tubular portion, where the piston head has a sealing portion that slides against the inner surface, and oblique cleaning liquid circulation grooves on the inner peripheral surface of the cleaning tubular portion, ensuring stable cleaning by restricting the piston's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sealing portion of the piston is arranged in the large-diameter portion of the cylinder for cleaning, then the cleaning accessibility is improved, but the piston cannot be restricted in the radial direction and assumes an unstable position
Solution Approach 1:
The cylinder is divided into two distinct portions: a large-diameter cleaning portion for cleaning operations and a small-diameter operation portion for normal pumping. This segmentation allows the piston to be positioned in the large-diameter portion during cleaning for better accessibility while maintaining stability through the transition to the small-diameter portion during operation.
Solution Approach 2:
The piston is moved to the large-diameter cleaning portion before cleaning begins, allowing cleaning liquid to be circulated effectively around the sealing portion. This preliminary positioning enables thorough cleaning while the piston remains stable due to the subsequent transition to the small-diameter operation portion.
2Ease of operation
If the piston is moved to the large-diameter portion of the cylinder, then cleaning liquid circulation is improved, but the sealing member may drop off due to positional changes
Solution Approach 1:
The cylinder's segmented structure with large-diameter and small-diameter portions ensures that during cleaning, the piston is positioned in the large-diameter portion for effective cleaning liquid circulation, while during operation, the piston transitions to the small-diameter portion where the sealing member is securely retained.
Solution Approach 2:
The transition from the large-diameter cleaning portion to the small-diameter operation portion acts as an intermediary mechanism that facilitates both effective cleaning and secure retention of the sealing member, preventing drop-off while maintaining cleaning effectiveness.
3Ease of operation
If the piston is moved to the large-diameter portion of the cylinder, then cleaning effectiveness is improved, but misalignment occurs when the plunger pump is operated again
Solution Approach 1:
The cylinder is segmented into cleaning and operation portions with different diameters. The piston moves between these segments, allowing effective cleaning in the large-diameter portion while ensuring precise alignment in the small-diameter operation portion through the geometric constraint of the narrower space.
Solution Approach 2:
The piston is preliminarily positioned in the large-diameter cleaning portion for effective cleaning, then subsequently positioned in the small-diameter operation portion where alignment is automatically improved due to the tighter geometric constraints, preventing misalignment during operation.
Data Source
AI summary
A plunger pump, including: a tubular cylinder that has an internal space communicating with inlet and outlet flow paths; and a piston that is movable along an axis of the cylinder, wherein a head of the piston includes, on an outer peripheral surface thereof, a sealing portion that is slidable against an inner peripheral surface of the cylinder, which includes a body tubular portion wherein the head is arranged during normal use, and a cleaning tubular portion wherein the head is arranged during cleaning, an inner peripheral surface of the cleaning tubular portion has an inner diameter equal to that of an inner peripheral surface of the body tubular portion, the cleaning tubular portion includes, on the inner peripheral surface thereof, at least one cleaning liquid circulation groove that is configured by a through hole or recess, and the cleaning liquid circulation groove extends obliquely with respect to the axis.