Centrifugal Compressor Liquid Injection Modification
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Solution Overview
Problem
Existing centrifugal compressors face difficulties in precision and quality when modifying the casing to accommodate a liquid injection device, particularly in securing size precision for the supply pipe and ensuring proper welding and straightness of support members.
Innovation Solution
A multistage centrifugal compressor design that includes a liquid injection device with a liquid injection path penetrating through the casing at a return bend, an internal path in the diaphragm, and a support system for the liquid supply pipe, allowing for liquid injection without requiring drill processing or welding on the casing, enabling modification of existing compressors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid injection device is installed in an existing centrifugal compressor by drilling holes and welding support members, then the liquid injection function is achieved, but the manufacturing precision and welding quality cannot be ensured
Solution Approach 1:
The liquid injection path is pre-formed in the casing during manufacturing, and the support member position is pre-prepared. This allows the supply pipe to be simply inserted and fixed without requiring on-site drilling or welding operations, thereby ensuring manufacturing precision while achieving the liquid injection function.
2Ease of manufacture
If drill processing and welding are performed on the casing to install the liquid injection device, then the liquid supply pipe can be connected, but the on-site processing becomes extremely difficult
Solution Approach 1:
The casing is pre-equipped with a liquid injection path and a support member position during manufacturing. This preliminary preparation eliminates the need for difficult on-site drilling and welding operations, making the installation process simple and easy to perform at the installation location.
3Ease of operation
If the supply pipe is inserted through the casing with pre-formed liquid injection path, then easy installation is achieved, but the supply pipe must be precisely guided to the injection path
Solution Approach 1:
A guide member is introduced as an intermediary component to guide the supply pipe into the liquid injection path. The guide member ensures precise positioning of the supply pipe without requiring high precision in the insertion operation itself, thereby facilitating easy installation while maintaining positioning accuracy.
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
Enables effective liquid injection for cooling and cleaning without the need for on-site drill processing or welding, ensuring precise installation and maintaining compressor performance.
Implementation Method 1
cleaning liquid or cooling liquid is injected into the flow path from nozzles that are provided in a pipe inserted from an outside into an inside of a casing of the centrifugal compressor
Implementation Method 2
cleaning liquid or cooling liquid is injected into the flow path from nozzles that are provided in a pipe inserted from an outside into an inside of a casing of the centrifugal compressor
Data Source
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AI summary
A multistage centrifugal compressor includes a casing, a rotor including a plurality of impellers, a diaphragm defining a gas flow path that includes a return flow path, and at least one liquid injection device configured to inject liquid into the gas flow path. The liquid injection device includes a liquid injection path, an internal path, a chamber, and a plurality of nozzles. The liquid injection path penetrates through the casing at a position corresponding to a return bend. The internal path receives a liquid supply pipe inserted from the liquid injection path through the return bend. The chamber is provided in the diaphragm along a circumferential direction and the liquid is introduced into the chamber through the internal path. The plurality of nozzles inject the liquid introduced into the chamber, to the gas flow path from different positions of the chamber in the circumferential direction.