Plunger Pump Hydraulic End Assembly Sealing Structure
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Solution Overview
Problem
Conventional plunger pumps face challenges in maintaining continuous operation with high pressure and large displacement due to sealing failures caused by cyclic loading, leading to premature wear and potential hydraulic cutting of the valve housing, which reduces the service life and poses safety risks.
Innovation Solution
A new hydraulic end assembly structure replaces the O-ring or D-ring sealing form with a suction packing seal assembly comprising a support ring, soft packing, hard packing, and packing junk ring, which provides enhanced sealing and resistance to high pressure and fluid flushing, reducing abrasion and extending the service life of the suction gland and valve housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If O-ring or D-ring sealing is used in conventional hydraulic end assembly, then the structure is simple and easy to manufacture, but the sealing reliability deteriorates under high pressure and large displacement due to cyclic loading causing deformation and indentation
Solution Approach 1:
The sealing structure is divided into multiple segments: support ring, soft packing, hard packing, and packing junk ring. Each segment performs a specific function - the soft packing provides sealing, the hard packing provides structural support and resistance to indentation, and the support ring maintains the overall structure. This segmentation resolves the contradiction by distributing the sealing function across multiple specialized components rather than relying on a single O-ring or D-ring.
Solution Approach 2:
The invention uses composite sealing materials combining soft packing (flexible sealing material) and hard packing (rigid support material). This composite structure provides both the sealing capability of soft materials and the structural integrity of hard materials, preventing the indentation and deformation issues that plague single-material seals like O-rings or D-rings under high pressure and cyclic loading.
2Device complexity
If conventional O-ring or D-ring sealing is used, then the device complexity is low, but the service life of valve housing deteriorates due to hydraulic cutting and abrasion from high pressure fluid flushing
Solution Approach 1:
The invention changes the physical parameters of the sealing system by introducing multiple materials with different properties (soft and hard packings) and multiple structural elements (support ring, packing junk ring). This parameter changes approach creates a sealing system that can withstand high pressure and fluid flushing without causing hydraulic cutting or excessive abrasion to the valve housing, thereby extending service life despite increased assembly complexity.
Solution Approach 2:
The hard packing and support ring are positioned beforehand to cushion and distribute the high pressure loads before they can concentrate on the valve housing surfaces. This pre-cushioning effect prevents the hydraulic cutting and localized abrasion that would otherwise occur with simple O-ring or D-ring seals, protecting the valve housing and extending its service life.
3Productivity
If high pressure and large displacement operation is implemented, then the productivity of plunger pump increases, but the sealing ring deteriorates rapidly due to long period cyclic loading causing deformation and recovery
Solution Approach 1:
The sealing function is segmented across multiple components (soft packing, hard packing, support ring, packing junk ring) rather than relying on a single sealing ring. This segmentation allows each component to be optimized for its specific function - the soft packing handles sealing while the hard packing and support ring handle the mechanical stresses of high pressure and cyclic loading, thereby maintaining productivity while extending service life.
Solution Approach 2:
Different parts of the sealing assembly have different local qualities - the soft packing has high elasticity for sealing, while the hard packing and support ring have high rigidity for structural support. This local quality differentiation allows the sealing system to withstand the demanding conditions of high pressure and large displacement operation without rapid deterioration, maintaining both productivity and service life.
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 suction packing seal assembly effectively maintains sealing under high pressure and large displacement conditions, reducing wear and significantly prolonging the service life of the hydraulic end assembly components, ensuring continuous operation of the plunger pump.
Implementation Method 1
the suction packing seal assembly... which has a good sealability, more resistant to high pressure and fluid flushing
Implementation Method 2
can reduce the abrasion of the suction gland or/and the valve housing
Data Source
AI summary
A hydraulic end assembly structure of a plunger pump, comprising a valve housing assembly, a suction gland and a suction pressing cap. The suction gland is connected to the suction pressing cap, and the suction gland is connected to the valve housing assembly through the suction packing seal assembly.