Rotary Compressor Discharge Valves for Controlled Backflow
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Solution Overview
Problem
Rotary displacement compressors face issues with backflow of compressed air when the compressor stops, leading to noise and potential damage due to reverse rotation of rotary parts, and existing check valves may malfunction, making it difficult to determine failure and causing reduced compressor life.
Innovation Solution
A rotary displacement compressor design that includes a check valve to prevent backflow and a backflow control valve in series, allowing a controlled rate of backflow to occur, which limits the flow rate and prevents damage while enabling detection of check valve failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve is provided to prevent backflow of compressed air, then reverse rotation of rotary parts is prevented, but if the check valve fails, high-speed reverse rotation occurs causing damage
Solution Approach 1:
The invention provides a backup protection mechanism by installing a backflow prevention device downstream of the check valve. This device acts as a safety cushion that limits reverse rotation speed to below dangerous levels even when the primary check valve fails, preventing catastrophic damage to the compressor body
Solution Approach 2:
The backflow prevention device serves as an intermediary safety mechanism between the check valve and the compressor body. It mediates the harmful effect of potential check valve failure by introducing a secondary control element that limits reverse rotation speed without interfering with normal compressor operation
2Reliability
If only a check valve is provided, then backflow is prevented, but it becomes difficult to determine when the check valve has failed
Solution Approach 1:
The invention implements a feedback mechanism where the backflow prevention device monitors the operational status of the check valve. When the check valve fails, the backflow prevention device detects the abnormal condition through increased backflow or reverse rotation attempts, providing feedback that enables detection of the failure state
Solution Approach 2:
The backflow prevention device acts as an intermediary monitoring system that observes the check valve's performance. It translates the check valve's failure state into detectable signals through its own operational responses, making the failure visible and measurable
3Object-generated harmful factors
If compressed air flows backward into the compression chamber, then noise is generated, but complete blockage may cause pressure buildup
Solution Approach 1:
The backflow prevention device serves as an intermediary flow control element between the discharge pipe and the check valve. It mediates the backflow by allowing controlled limited flow that prevents noise-generating turbulence and pressure buildup, while still blocking catastrophic reverse rotation
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 prevents compressor damage and allows for the determination of check valve failures, ensuring the compressor body's longevity and safe operation by controlling backflow and detecting valve malfunctions.
Implementation Method 1
a check valve that shuts off the compressed medium flowing backward to the compressor body
Implementation Method 2
a backflow control valve that allows a predetermined rate of the compressed medium to flow backward
Data Source
AI summary
An object of the present invention is to provide a rotary displacement compressor capable of determining whether a check valve has failed, and preventing the life of a compressor body from being reduced when a compression operation stops. In order to achieve the object, a rotary displacement compressor includes a compressor body that compresses a medium by reducing a volume of the medium using rotation; a discharge pipe through which a compressed medium, which is discharged through a discharge port of the compressor body, flows; a check valve that shuts off the compressed medium flowing backward to the compressor body; and a backflow control valve that allows a predetermined rate of the compressed medium to flow backward. The check valve and the backflow control valve are disposed in series via the discharge pipe.