Screw Compressor Discharge Passage Enlarged Cross Section
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Solution Overview
Problem
Screw compressors experience pressure loss in the discharge passage due to the presence of oil and the need to curve the passage to bypass bearings, leading to vortex generation and increased pressure loss, especially in oil-supply compressors.
Innovation Solution
A screw compressor design with a discharge passage that extends in the rotational axis direction and gradually enlarges its cross-sectional area from the discharge port to the downstream side, reducing vortex formation and pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge passage is curved to bypass the discharge-side bearings, then the bearing support structure is maintained, but vortexes are generated and pressure loss increases
Solution Approach 1:
The discharge passage extends in the rotational axis direction (another dimension) rather than curving laterally to bypass bearings. This dimensional change allows the passage to avoid bearing interference while maintaining a straighter flow path, reducing vortex generation and pressure loss.
Solution Approach 2:
The flow passage cross-sectional area is gradually enlarged from the discharge port toward the downstream side. This parameter change in geometry reduces flow velocity and minimizes pressure loss while maintaining effective bearing support through the journal section configuration.
2Device complexity
If the flow passage cross-sectional area is constant, then the passage structure is simple, but pressure loss increases due to higher flow velocity
Solution Approach 1:
The flow passage cross-sectional area is gradually enlarged from the discharge port toward the downstream side. This parameter change in geometry reduces flow velocity and minimizes pressure loss while maintaining manufacturing feasibility through the journal section configuration.
3Loss of energy
If the discharge passage extends in the rotational axis direction, then pressure loss is reduced, but the arrangement flexibility with downstream devices may be limited
Solution Approach 1:
The discharge passage extends in the rotational axis direction (another dimension relative to the lateral arrangement) to reduce pressure loss. The journal section configuration allows the passage to extend axially while still providing bearing support, maintaining arrangement flexibility through this dimensional approach.
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 effectively suppresses pressure loss in the discharge passage by reducing flow velocity and minimizing vortex generation, improving the compressor's performance and flexibility in arrangement with other devices.
Implementation Method 1
a flow passage cross-sectional area of the enlarged flow passage section is gradually enlarged from the discharge port to a downstream side in a compressed gas flow direction
Data Source
AI summary
A screw compressor includes: a male rotor 2 and a female rotor 3 including a rotor tooth section 21, 31 that has multiple helical teeth, the male rotor 2 and the female rotor 3 rotating in engagement with each other; a casing 4 including a main casing 41 with a bore 45 formed to accommodate the male rotor 2 and the female rotor 3, and a discharge-side casing 43 closing a discharge side of the bore 45; and a discharge passage 60 including a discharge port 61 that opens in a rotational axis direction of the male rotor 2 and the female rotor 3 on a bore side surface of the discharge-side casing 43, compressed gas flowing from the discharge port 61 circulating in the discharge passage 60. The male rotor 2 and the female rotor 3 are configured such that a discharge-side end surface 21a, 31a of the rotor tooth section 21, 31 serves as a discharge-side distal end of the male rotor 2 or the female rotor 3 in the rotational axis direction. The discharge passage 60 includes an enlarged flow passage section 63 formed such that the enlarged flow passage section 63 extends from the discharge port 61 in the rotational axis direction of the male rotor 2 and the female rotor 3 and that a flow passage cross-sectional area is gradually enlarged from the discharge port 61 to a downstream side in a compressed gas flow direction.