Screw Compressor Slide Valve for Variable Internal Volume Ratio
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Solution Overview
Problem
Fixed-frequency screw compressors suffer from inefficiencies and noise due to fixed internal volume ratios, leading to under-compression or over-compression states, resulting in high energy consumption and noise.
Innovation Solution
A slide valve with a slider that adjusts its position based on internal and external pressures, allowing the internal volume ratio to match the external pressure, reducing power loss and noise by varying the exhaust aperture size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a fixed internal volume ratio is used in the screw compressor, then the structure is simple and stable, but the compressor operates in under-compression or over-compression states leading to high energy consumption and noise
Solution Approach 1:
The patent applies the dynamics principle by making the exhaust aperture adjustable through a slider mechanism. The slider can move along the pressure discharge surface to change the size of the exhaust aperture, allowing the internal volume ratio to be dynamically adjusted to match external pressure conditions. This resolves the contradiction by enabling energy-efficient operation under varying conditions while maintaining a relatively simple structural design.
Solution Approach 2:
The patent applies parameter changes by varying the exhaust aperture size through slider movement. By changing the aperture parameter, the internal volume ratio is adjusted to optimize compression efficiency. This allows the compressor to adapt to different operating conditions and avoid under-compression or over-compression states, thereby reducing energy consumption without requiring a completely complex system redesign.
2Object-affected harmful factors
If the exhaust aperture size is fixed, then the device structure is simple, but noise is generated due to pressure mismatch between internal and external pressures
Solution Approach 1:
The slider mechanism enables dynamic adjustment of the exhaust aperture size to match pressure conditions. When internal pressure exceeds external pressure, the slider moves to increase the aperture; when external pressure is higher, the aperture decreases. This dynamic adaptation eliminates pressure mismatch noise while maintaining structural simplicity through the straightforward slider-guide rod-spring arrangement.
Solution Approach 2:
The spring-loaded slider mechanism automatically adjusts the exhaust aperture in response to pressure differential changes without external control. The system self-regulates by allowing the slider to move freely based on pressure forces, eliminating the need for sensors or actuators, thus reducing noise while keeping the structure simple.
3Productivity
If a variable internal volume ratio is implemented, then operating efficiency is improved under varying conditions, but the device structure becomes more complex
Solution Approach 1:
The patent implements variable internal volume ratio through the dynamic slider mechanism that adjusts the exhaust aperture. This allows the compressor to optimize its operating efficiency by matching the internal volume ratio to external pressure conditions. The structural complexity is minimized by using a simple slider-guide rod-spring assembly rather than complex control systems, achieving a balance between productivity improvement and structural simplicity.
4Reliability
If the slider is allowed to move freely to adjust exhaust aperture, then pressure matching is improved, but the slider may become unstable or mispositioned
Solution Approach 1:
The guide rod acts as an intermediary element that provides stable guidance for the slider movement. It ensures the slider moves smoothly along the pressure discharge surface while maintaining proper positioning. The guide rod works in conjunction with the spring to provide both movement freedom and positional stability, ensuring reliable pressure matching without requiring complex control mechanisms.
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 improves operating efficiency and reduces noise by dynamically adjusting the internal volume ratio to match external pressure, minimizing power consumption and noise under varying conditions.
Implementation Method 1
a spring connected to the slider and configured to drive the slider to slide to a position where the outer edge of the slider is flush with the pressure discharge surface
Implementation Method 2
a guide rod fixedly connected to the support surface and extending in a direction parallel to a sliding direction of the slider
Data Source
AI summary
This application provides a screw compressor and a slide valve thereof. The slide valve includes: a valve body having a cylindrical shape extending in an axial direction, with a side surface having a pressure discharge surface that matches an outer peripheral contour of a rotor of the screw compressor; a discharge chamber provided at an end of the pressure discharge surface along the axial direction; a slider provided in the discharge chamber, and configured to slide along a radial direction of the valve body, a shape of an outer edge of the slider matching a shape of the pressure discharge surface; and a spring connected to the slider and configured to drive the slider to slide to a position where the outer edge of the slider is flush with the pressure discharge surface.