Intelligent sealing device for ship tail shaft numerical control magnetic fluid

Abstract

The invention discloses an intelligent sealing device for ship tail shaft numerical control magnetic fluid. According to the main structure of the intelligent sealing device, a stuffing box is arranged at the sealed part of a tail shaft, one end of the box is provided with a gland, and the other end of the box is connected with a sternpost through a flange. Two layers of PTFE ring box sleeves are arranged in the middle of the box in parallel, and nx twelve radial hedging magnetic sector permanent magnets are embedded in each layer of box sleeve. Magnetic fluid circulating cavities are formed between the box sleeves in which the magnets are embedded and a shaft tube. The two sides of each permanent magnet box sleeve are each provided with a stainless steel circular ring and provided with eight magnetic fluid injecting or discharging holes, wherein the outer sides of the two stainless steel circular rings are each provided with a stainless steel clamping ring. An AH type metal framework teflon sealing ring is clamped on a tail shaft tube. An MCU is arranged, a magnetic fluid input pump and an electromagnetic overflow valve are controlled according to the pressure and temperature sensor information, the pressure in the magnetic fluid circulating cavities and the pressure at the draft of a warship and a submarine can be randomly the same, sealing, lubricating and cooling functions are achieved on the tail shaft tube through circulation of pressurized cold and hot magnetic fluid, and an electromagnetic sealing brake is arranged for strengthening static sealing of the tail shaft tube during downtime.

Description

1. Technical field: [0001] The present invention relates to the change and innovation of the stern shaft sealing principle, sealing method and sealing structure of various large and medium-sized ships driven by propellers (including aircraft carriers and various large and medium-sized submarines and warships), and eliminates various backward contact sealing methods. Realize the smart seal with no leakage, no wear, no noise, no heat radiation and good vibration absorption of the stern shaft in the sealing area. [0002] Regarding magnetic fluid intelligent sealing technology, the inventor Deng Haibo has obtained ZL 200820065400.0 utility model patent after more than 10 years of research; ZL 201420073652.3 utility model patent; The shaft dynamic seal reaches 3-5MPa (equivalent to bearing the pressure of 300-500 meters underwater), and has not leaked for more than a year. It has been popularized and applied in Karamay, Jilin and other oil fields, and the effect is good. Practice...

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Problems solved by technology

[0023] In order to adapt to the modernization, large-scale and high-speed development of ships, and to overcome many defects such as large friction resistance, large power consumption, large leakage, high energy consumption, poor safety and environmental protection, and complicated installation and maintenance of various contact stern shaft sealing devices, the A smart seal with no leakage, no wear, no noise, no heat radiation, and good vibration damping in the stern shaft seal area is replaced

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