Communication network construction method of compressor in large helium low-temperature system and communication network

By constructing a chain-structured communication network in a large-scale helium cryogenic system, and utilizing RS485 repeaters and DP-to-fiber modules combined with fiber optic transmission, the problem of excessively long transmission distances was solved, enabling stable transmission and automatic control of high-rate signals.

CN121814201APending Publication Date: 2026-04-07ZHONGSHAN ADVANCED CRYOGENIC TECH RES INST
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Patent Information

Application Number
CN202511774865.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-28
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

The existing PROFIBUS DP communication transmission method cannot meet the requirements of compressors in large helium cryogenic systems with transmission distances exceeding 400 meters, resulting in communication failure.

Method used

By using a chain structure to connect multiple refrigeration unit control cabinets and compressors, incorporating RS485 repeaters and DP-to-fiber optic modules, and through terminating resistor matching settings, combined with fiber optic transmission, a communication network for a large-scale helium cryogenic system was constructed, enhancing signal transmission capabilities.

Benefits of technology

High-rate signal transmission was achieved within a 20-kilometer range, ensuring stable automatic control of the compressor in the large-scale helium cryogenic system and avoiding network hardware failures.

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Abstract

The invention is suitable for the technical field of long-distance automatic control, provides a communication network construction method for a compressor in a large-scale helium low-temperature system and a communication network, and aims to solve the problem that the transmission rate of PROFIBUS DP communication cannot meet the rate requirement of automatic control of the large-scale helium low-temperature system after the distance exceeds 400 meters. Combining optical fibers with a PROFIBUS DP network is expected to expand the effective transmission range. And through the matching arrangement of the terminal resistors, the situation that the resistance of the whole network terminal is increased due to the addition of the RS485 repeater is reduced, and communication hardware faults are avoided. The effective transmission distance of PROFIBUS DP communication is effectively improved, and the technical effects of automatic control of a large helium low-temperature system and stable operation of a communication network are achieved.
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