Compressor Slide Valve Grooved Lubrication High Pressure
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Solution Overview
Problem
Existing slide valve assemblies in compressors tend to seize up and get damaged due to high discharge-suction pressure differentials, particularly exceeding 27.6 bar (400 psi), which is a limitation in high-pressure environments.
Innovation Solution
A slide valve assembly with contoured and grooved surfaces to facilitate lubrication and prevent seizing, using a slide valve carriage with separate grooves for high and low pressure areas, and clamping mechanisms made from heat-treated steel to secure the slide valve members, allowing for independent movement and adjustment between full load and part load positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional slide valve assemblies are used in compressors, then the compressor can operate at normal pressure differentials, but the slide valve mechanisms seize up and get damaged when discharge-suction pressure differential exceeds 27.6 bar (400 psi)
Solution Approach 1:
The patent changes the material parameter of the clamping mechanism from conventional materials to heat-treated steel, which has superior mechanical properties including higher strength and better wear resistance. This material parameter change enables the clamping mechanism to withstand the high contact pressures generated when operating at discharge-suction pressure differentials exceeding 27.6 bar, preventing seizure and damage while maintaining reliable operation
Solution Approach 2:
The patent employs composite material construction in the slide valve assembly, specifically using heat-treated steel for the clamping mechanism components that experience high stress. This selective use of enhanced materials in critical areas allows the assembly to handle high pressure differentials without compromising the overall structure, resolving the contradiction between operating pressure capability and component reliability
2Stress or pressure
If the clamping mechanism is made from heat-treated steel, then the slide valve assembly can function in high pressure environments up to 55.2 bar (800 psi), but the manufacturing complexity and cost increase
Solution Approach 1:
The patent applies local quality enhancement by using heat-treated steel specifically for the clamping mechanism components that are subject to high contact pressures, rather than making the entire slide valve assembly from high-strength material. This localized application of enhanced material properties achieves the necessary pressure tolerance while minimizing the overall manufacturing complexity and cost increase
Solution Approach 2:
The patent modifies the material parameter (heat treatment) of specific components to achieve high pressure capability. The heat treatment process changes the microstructure and mechanical properties of the steel, enabling it to withstand high pressures. This parameter change is applied selectively to only those components that require high strength, balancing manufacturing feasibility with performance requirements
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 slide valve assembly effectively operates in high-pressure environments up to 55.2 bar (800 psi) without seizing, ensuring reliable compressor operation and minimizing damage, while allowing for efficient capacity and volume control.
Implementation Method 1
A slide valve assembly with contoured and grooved surfaces to facilitate lubrication and prevent seizing
Implementation Method 2
clamping mechanisms made from heat-treated steel to secure the slide valve members
Data Source
Figure 1
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Figure 3A~3B
AI summary
A compressor having a high pressure slide valve assembly is disclosed. The slide valve assembly includes: a volume slide valve mechanism, the mechanism slidably movable to control compressor volume ratio and power input to the compressor. The assembly also includes a capacity slide valve mechanism that is in operational association with the volume slide valve mechanism, the capacity slide valve mechanism slidably movable to control compressor capacity. At least one of the volume slide valve mechanism and the capacity slide valve mechanism includes at least one groove or channel, and the at least one groove or channel provides for lubrication to ensure relative movement between the slide mechanisms in a high pressure environment. A method of controlling compressor volume ratio, power input and capacity in a compressor operating in a high pressure environment is also disclosed.