Detector for vacuum state in ship tail shaft sealing chamber

Abstract

The invention discloses a detector for the vacuum state in a ship tail shaft sealing chamber. A plurality of sealing chambers are arranged at a ship tail shaft part, wherein the detector comprises a detection port arranged on the side wall of each sealing chamber; the detection port of each sealing chamber is connected with an air inlet port of a one-way valve; the other end of the one-way valve is provided with a detector connection port; the detector comprises a detection tube; one end of the detection tube is connected with the other end of the one-way valve; the other end of the detectiontube is connected with a vacuum generator; a control valve is connected in series with the detection tube; a vacuum degree detection port is arranged on the detection tube at one side of the control valve; an elastic adhesive film is arranged on the vacuum degree detection port; a conductive layer is attached to the elastic adhesive film; the upper end or the lower end of the vacuum degree detection port is provided with a pair of electrodes which correspond to the conductive layer in position and are separated from each other; and the pair of electrodes are connected with a controller and thelike through a wire. When the negative pressure in the detection tube reaches a set negative pressure value, the elastic adhesive film is recessed to make the conductive layer connect or disconnect the pair of electrodes.

Description

Technical field [0001] The invention relates to the field of detection technology for the installation of a ship stern shaft, in particular to a sealing device for detecting the vacuum state of the ship stern shaft seal. Background technique [0002] The stern shaft of a ship is the connecting shaft between the propeller and the engine. The engine drives the propeller to rotate through the stern shaft of the ship, and the axial thrust generated by the rotation of the propeller is transmitted to the hull to drive the ship forward. In order to prevent sea water from entering the ship along the stern shaft or to prevent the lubricating oil in the engine from leaking out of the ship, it is necessary to install a stern shaft sealing device on the stern shaft of the ship. [0003] The existing ship stern shaft seal includes several sealing chambers, and each sealing chamber is provided with a connection port, and lubricating oil or air is passed into the sealing chamber to realize the se...

AI Technical Summary

Problems solved by technology

In order to ensure that the stern shaft can work normally after installation, it is necessary to inspect the sealing performance of the stern shaft seal, so as to prevent the stern shaft seal from being unqualified when the components are installed in place, and then disassemble the components, resulting in a lot of manpower, material resources and time waste of

[0004] At present, the inspection of the sealing of the stern shaft is generally done by sealing both ends of the sealing device with the sealing plate, the sealing plate and the outermost seal together form a sealing cavity, and then injecting water into the sealing cavity through the connection port to check this. The tightness of the seal, however, there are two problems in this inspection method. One is that it can only check the seal of the seal cavity formed between the seal plate and the outermost seal, and cannot check the tightness of the remaining seals. When checking the sealing performance, it is necessary to frequently disassemble the sealing plate, screw rod, and rubber. The process is cumbersome and the rubber consumes a lot. At the same time, the leak detection is carried out by observing the water pressure. The water vapor on the seal is processed, increasing the inspection process, thereby reducing the inspection efficiency

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