Oil-Free Screw Compressor Segmented Discharge Port
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Solution Overview
Problem
Conventional oil-free screw compressors face issues with excessive compression, increased power consumption, and temperature rise due to complex discharge port designs, which also lead to performance degradation and high manufacturing costs.
Innovation Solution
An oil-free screw compressor design featuring a pair of male and female screw rotors with twisted teeth, a casing with a suction port and discharge port, and a shaft sealing apparatus, including a processing slot that extends from the tooth bottom circle of the female rotor to the tooth top circle of the male rotor, preventing oil entry and optimizing discharge until the compression chamber volume reaches zero.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a complex discharge port design is used to prevent working gas remaining near the discharge port, then excessive compression is reduced, but manufacturing cost increases
Solution Approach 1:
The discharge port is segmented into multiple regions: a first discharge port region that opens early to allow working gas discharge, and a second discharge port region that opens later. This segmentation allows different timing for discharge at different locations, preventing excessive compression while using a relatively simple manufacturable structure.
Solution Approach 2:
The invention introduces a temporal dimension to the discharge port design by controlling the opening timing of different spatial regions. The first and second discharge port regions operate at different times during the compression cycle, effectively managing gas discharge timing without requiring complex three-dimensional shaping.
2Stability of the object's composition
If the rotor length is increased to suppress vibration in high-speed rotating apparatus, then vibration is reduced, but the casing depth is considerably restricted
Solution Approach 1:
The invention uses dynamic timing control of the discharge ports instead of relying solely on increased rotor length. By controlling when the first and second discharge port regions open during rotation, the system achieves effective gas discharge and vibration suppression without requiring excessive rotor or casing length.
3Reliability
If a shaft sealing apparatus is added to prevent oil from entering the compression chamber, then oil-free compression is achieved, but the rotor becomes longer
Solution Approach 1:
The shaft sealing apparatus is segmented into multiple sealing elements arranged along the rotor shaft. This segmentation allows effective oil prevention while distributing the sealing function across multiple smaller components rather than requiring a single long sealing structure.
4Temperature
If discharge cooling is positioned close to the discharge port, then discharge temperature is kept low and suction pressure rise is suppressed, but power consumption increases due to excessive compression
Solution Approach 1:
The discharge cooling system is integrated with the segmented discharge port design, allowing cooling to be applied to different gas volumes at different stages. This prevents excessive compression of residual gas while maintaining effective discharge temperature control, reducing power consumption.
Data Source
AI summary
An oil free screw compressor comprises: a pair of male and female screw rotors (1,2) in which two or more twisted teeth are formed; a casing (3) which receives both the rotors (1,2) and in which a suction port and a discharge port are formed; and bearings (11-14) which rotatably support shaft end parts of both the rotors (1,2) and are held in the casing (3). There is provided a slot (6), next to the discharge port of the casing (3), which comes into communication with the discharge port with timing where a volume of a compression chamber formed by both the rotors (1,2) and the casing (3) becomes substantially zero as both the rotors (1,2) rotate, to prevent problems such as excessive compression.