Segmented Stuffing Box Assembly for Hydraulic Pump Sealing
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Solution Overview
Problem
Existing hydraulic fluid pumps face challenges in effectively sealing the plunger bore, leading to fluid leakage and reduced efficiency.
Innovation Solution
A stuffing box assembly comprising a first stuffing box member with a plunger bore and a second stuffing box member with a threaded stuffing nut bore, secured together by fasteners, which houses a plurality of seals and a stuffing nut to ensure proper sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing sealing methods are used in hydraulic fluid pumps, then the structure is simpler, but fluid leakage occurs and sealing effectiveness is reduced
Solution Approach 1:
The stuffing box is divided into multiple members (first stuffing box member, second stuffing box member, third stuffing box member) that can be assembled in segments. This segmentation allows for better sealing surface contact and distribution of sealing forces across multiple interfaces, improving overall sealing effectiveness while maintaining manageable structural complexity
Solution Approach 2:
The seals are nested within grooves in the stuffing box members, and the stuffing nut is threaded into the stuffing box assembly. This nested configuration allows the seals to be contained and compressed within the stuffing box structure, enhancing sealing capability through progressive compression while organizing components in a compact hierarchical arrangement
2Productivity
If existing sealing methods are used, then the assembly is simpler, but fluid leakage reduces pump efficiency
Solution Approach 1:
Different stuffing box members are designed with specific local features: the first member has a plunger bore and seal grooves, the second member has a stuffing nut bore, and the third member provides additional sealing surfaces. This local differentiation optimizes sealing at each specific location within the assembly, preventing leakage that would reduce pump efficiency
Solution Approach 2:
The seals are pre-installed in grooves within the stuffing box members before final assembly. The stuffing nut is threaded into position to pre-compress the seals against the plunger and stuffing box surfaces. This preliminary positioning and compression ensures seals are properly seated and loaded before operation, preventing leakage and maintaining pump efficiency
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 solution provides enhanced sealing capabilities, reducing fluid leakage and improving the overall efficiency of the hydraulic fluid pump by effectively compressing and maintaining the seals within the stuffing box assembly.
Implementation Method 1
A stuffing nut is inserted into the stuffing nut bore, thereby applying an axial force on the plurality of seals
Data Source
AI summary
A stuffing box assembly for a fluid end of a hydraulic fluid pump includes a first stuffing box member having a first plunger bore configured to receive a plunger of the hydraulic fluid pump and a plurality of seals. The first stuffing box member further comprises a first bore spaced apart from the plunger bore. A second stuffing box member has a threaded stuffing nut bore configured to receive a stuffing nut of the hydraulic fluid pump. The second stuffing box member further comprises a second bore spaced apart from the stuffing nut bore. A fastener is configured to extend through the first and second bores to secure the first stuffing box member to the second stuffing box member.