Packing Cartridge Interface for Front-Access Pump Maintenance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The replacement and maintenance of packing in positive displacement pumps are difficult due to obstructions from stay rods, and the fluid end experiences wear and leaks under high pressure and reciprocation, leading to potential failure.
Innovation Solution
A packing retaining component comprising a valve cartridge and packing cartridge housing, which are engaged to form a fluid-tight interface, allowing for easy insertion and removal from the front end of the fluid end block, reducing wear and facilitating maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If packing is replaced through the back end of the fluid end, then the packing can be replaced, but the operation is difficult due to obstruction from stay rods
Solution Approach 1:
The packing retaining component is divided into a packing cartridge and a valve cartridge, with the packing cartridge being separable from the valve cartridge. This segmentation allows the packing cartridge to be removed independently through the front end of the fluid end block, avoiding obstruction from stay rods at the back end.
Solution Approach 2:
Instead of accessing the packing from the back end of the fluid end where stay rods obstruct access, the invention inverts the approach by providing access through the front end of the fluid end block. The packing cartridge is designed to be removable from the front end, reversing the traditional maintenance access direction.
2Power
If the fluid end operates under high pressure and reciprocation, then the pump can perform hydraulic fracturing, but the fluid end experiences wear and leaks
Solution Approach 1:
The fluid-tight interface between the packing cartridge and valve cartridge provides protection against high pressure and reciprocation forces before wear can occur. This interface acts as a protective barrier that cushions the fluid end block from the harsh operating conditions, preventing leaks and wear during normal operation.
Solution Approach 2:
The fluid-tight interface acts as an intermediary element between the packing cartridge and valve cartridge, mediating the transmission of high pressure and reciprocation forces. This interface protects the fluid end block from direct exposure to these harsh conditions, reducing wear and improving reliability.
3Reliability
If the packing retaining component provides a fluid-tight interface, then leaks are prevented, but the component structure becomes more complex
Solution Approach 1:
The packing cartridge and valve cartridge are merged into a single integrated packing retaining component with a unified fluid-tight interface. This merging ensures leak prevention while maintaining a relatively simple structure, as the two cartridges work together as a coordinated assembly rather than separate components requiring multiple interfaces.
Data Source
AI summary
A fluid end of a fluid pump may include a fluid end block with a bore in which a plunger is to reciprocate. The fluid end may include a valve cartridge, configured for insertion into and removal from the bore as a unit, including a valve cartridge housing having an open end, and a plurality of valves operably connected to the valve cartridge housing. The fluid end may include a packing cartridge, configured for insertion into and removal from the bore as a unit, including a packing cartridge housing having a plunger bore, to receive the plunger, that defines a first open end and a second open end of the packing cartridge housing. The valve cartridge housing and the packing cartridge housing are engaged such that the open end of the valve cartridge housing and the first open end of the packing cartridge housing overlap.