Screw Compressor Exhaust Structure for Noise Reduction
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Solution Overview
Problem
In semi-closed screw compressors without a built-in oil separating core, the proximity of the exhaust port to the oil separating barrel discharge port hampers effective noise insulation due to gas flow pulsation, as the discharge port must be located at the lower part to allow refrigerant oil discharge, leading to insufficient noise reduction.
Innovation Solution
The compressor exhaust structure includes a first exhaust chamber in the exhaust bearing seat, a second exhaust chamber in the machine body, and a third exhaust chamber between the bearing seat and the oil separating barrel, with fluid communication between these chambers, extending the gas flow path and reducing noise pulsation by facilitating gas flow insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the discharge port of the exhaust bearing seat is positioned in the lower part to allow refrigerant oil discharge, then refrigerant oil can be smoothly discharged, but the discharge port becomes too close to the discharge port of the oil separating barrel, resulting in insufficient noise insulation
Solution Approach 1:
The exhaust system is segmented into multiple independent chambers: the exhaust bearing seat contains a first exhaust chamber, the machine body contains a second exhaust chamber, and the oil separating barrel contains a third exhaust chamber. These chambers are connected through fluid communication passages, allowing the exhaust gas to flow sequentially through each chamber. This segmentation increases the overall flow path length and provides sufficient spacing between discharge ports, thereby achieving both effective refrigerant oil discharge and adequate noise insulation.
2Ease of operation
If the discharge port of the exhaust bearing seat is positioned in the lower part, then refrigerant oil can be smoothly discharged, but gas flow pulsation occurs that hampers effective noise insulation
Solution Approach 1:
The second exhaust chamber in the machine body serves as an intermediary chamber between the first exhaust chamber (in the exhaust bearing seat) and the third exhaust chamber (in the oil separating barrel). This intermediary chamber receives exhaust gas from the first chamber and directs it to the third chamber through a fluid communication passage. The intermediary chamber acts as a buffer that smooths out gas flow pulsation while maintaining the lower position discharge port for refrigerant oil discharge, thereby reducing noise generation.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Disclosed are a compressor exhaust structure, a screw compressor and an air-conditioning unit, wherein the compressor exhaust structure comprises a machine body (2), an exhaust bearing seat (1) provided on an exhaust end of the machine body (2), and an oil separating barrel (5) covering the exhaust bearing seat (1). The exhaust bearing seat (1) is provided with a first exhaust chamber, the machine body (2) is provided with a second exhaust chamber (21), and a third exhaust chamber is formed between the exhaust bearing seat (1) and an inner wall of the oil separating barrel (5); the first exhaust chamber is in fluid communication with the second exhaust chamber (21), the second exhaust chamber (21) is in fluid communication with the third exhaust chamber, and the third exhaust chamber is in fluid communication with a discharge port of the oil separating barrel (5). The above-mentioned compressor exhaust structure enables gas flow to firstly enter the machine body (2) via the exhaust bearing seat (1) and then to flow out of the machine body (2), which extends the flow path of the gas flow, facilitates the isolation of gas flow noise, and reduces gas flow pulsation.