Sliding Vane Compressor Back Pressure Oil Cavity Design
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Solution Overview
Problem
The sliding vane compressor faces issues with insufficient back pressure, leading to leakage and increased noise and vibration due to the sliding vane not being consistently attached to the inner wall of the cylinder.
Innovation Solution
A pump body assembly with a back pressure oil cavity at the tail end of the sliding vane chute, where the oil inlet is positioned lower than the oil outlet, ensuring a lubrication medium fills the cavity and provides sufficient back pressure to maintain the vane's attachment to the cylinder, along with a complex oil passage system involving central and radial oil holes, flanges, and chutes to ensure consistent lubrication and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sliding vane is designed to project out of the sliding vane chute to attach to the inner wall of the cylinder, then the compression function is improved, but the back pressure becomes insufficient causing the vane to detach
Solution Approach 1:
The patent introduces a hydraulic back pressure mechanism by designing the tail end of the sliding vane chute as a back pressure oil cavity with oil inlet and outlet. Lubricating medium flows through this cavity to generate back pressure that pushes the sliding vane toward the cylinder wall, ensuring reliable attachment during compression operation.
Solution Approach 2:
The patent changes the pressure parameter by creating a pressure differential within the back pressure oil cavity. The oil inlet is positioned lower than the oil outlet, causing the lubricating medium to fill the cavity and maintain a specific pressure level that provides the necessary back pressure for vane attachment.
2Stress or pressure
If the oil inlet is positioned lower than the oil outlet in the back pressure oil cavity, then the back pressure is improved, but the device complexity increases
Solution Approach 1:
The patent makes the lubricating medium serve multiple functions: it provides back pressure through the height-differential oil passage, lubricates the sliding vane and cylinder wall interface, and dissipates heat from the compression process. This multi-functionality justifies the additional oil passage structure.
Solution Approach 2:
The back pressure oil cavity structure uses the natural flow characteristics of the lubricating medium (entering at lower inlet, exiting at higher outlet) to automatically generate back pressure without requiring additional active control mechanisms. The system self-regulates the pressure through its geometric design.
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
This configuration ensures the sliding vane remains attached to the cylinder, reducing leakage and noise, improving the compressor's reliability and stability by providing adequate back pressure and effective lubrication and heat management.
Implementation Method 1
a lubrication medium enters the back pressure oil cavity through the oil inlet of the back pressure oil cavity and fills up the back pressure oil cavity and flows out from the top of the back pressure oil cavity
Implementation Method 2
ensuring a lubrication medium enters the back pressure oil cavity
Data Source
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AI summary
A pump body assembly and a compressor are provided. The pump body comprises: a spindle (100), wherein the spindle (100) has a sliding vane chute (110), a back pressure oil cavity (120) being at least a part of an oil passage (160) is located at a tail end of the sliding vane chute (110), an oil outlet (121) of the back pressure oil cavity is located at the top of the back pressure oil cavity (120), and a position of the oil inlet (122) of the back pressure oil cavity is lower than that of an oil outlet (121) of the back pressure oil cavity such that a lubrication medium enters the back pressure oil cavity (120) through the oil inlet (122) of the back pressure oil cavity and fills up the back pressure oil cavity (120) and flows out from the top of the back pressure oil cavity (120).