Shaft seal structure of threaded-rod steam compressor and monitoring system thereof

Abstract

The invention discloses a shaft seal structure of a threaded-rod steam compressor and a monitoring system thereof. The threaded-rod steam compressor comprises a shell, a threaded-rod rotor arranged inthe shell, the shaft seal structure, high-pressure-side bearings and a low-pressure-side bearing; the threaded-rod rotor comprises a threaded-rod compression part and two-side rotor shaft parts, thethreaded-rod compression part compresses steam, and the high-pressure-side bearings and the low-pressure-side bearing sleeve the two rotor shaft parts; the shaft seal structure is characterized by comprising a high-pressure-side shaft seal assembly and a low-pressure-side shaft seal assembly which are arranged on the rotor shaft parts and located between the high-pressure-side bearings and the threaded-rod compression part and the low-pressure-side bearing and the threaded-rod compression part, the high-pressure-side shaft seal assembly comprises high-pressure-side front-arranged seals, a high-pressure-side skeleton air seal and a high-pressure-side skeleton oil seal, and the low-pressure-side shaft seal assembly comprises low-pressure-side front-arranged seals, a low-pressure-side skeleton air seal and a low-pressure-side skeleton oil seal. The monitoring system monitors working states of the high-pressure-side skeleton air seal, the low-pressure-side skeleton air seal, the high-pressure-side skeleton oil seal and the low-pressure-side skeleton oil seal. The structure is simplified, the emptying amount of steam is decreased, injection of compressed air is canceled, and the cost issaved; monitoring of the shaft seal structure is achieved under the condition that the machine is not disassembled.

Description

technical field [0001] The invention belongs to the technical field of compressor sealing, in particular to a shaft sealing structure of a screw steam compressor, and also relates to a monitoring system for monitoring the shaft sealing structure. Background technique [0002] The screw steam compressor has a large operating temperature difference, high efficiency, convenient flow adjustment, and simple operation. It has been successfully used in sewage treatment, exhaust steam recovery, superheated drying, heat pump rectification and other fields. The structure of the screw steam compressor is similar to that of the oil-free screw air compressor. The biggest difference is that the design of the shaft seal structure of the screw steam compressor is more difficult. It is necessary to prevent the lubricating oil from entering the steam system to pollute the gas, and to prevent the steam from entering the lubricating oil system. Destroy the quality of lubricating oil. [0003] ...

AI Technical Summary

Problems solved by technology

[0005] The primary task of the present invention is to provide a shaft seal structure of a screw steam compressor, which solves the problems of complex shaft seal structure and its application system, large steam venting volume and large compressed air consumption in conventional screw steam compressors

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