Maintenance-free vacuum valve of negative pressure system of movable sand sucker for ship

Abstract

The invention relates to a maintenance-free vacuum valve of a negative pressure system of a movable sand sucker for a ship. The vacuum valve is installed on a negative pressure pipe of the movable sand sucker and structurally comprises a support, a guide pipe and a seal plate. The support comprises a baseplate (1) and columns (2) fixed to the baseplate, the guide pipe (3) is of a cylindrical structure with open upper and lower ends and is fixed to the negative pressure pipe (12) through connection flanges (4), the lower half portion of the guide pipe (3) is located on the portion, in the support, of the negative pressure pipe (12), the connection flanges (4) are fixed to the tops of the columns (2), the seal plate (5) is arranged in the support and located below the guide pipe (3), and theupper surface of the seal plate (5) abuts against the lower end face of the guide pipe (3) through spring force. The maintenance-free vacuum valve is simple in structure, convenient to install and use, sensitive to respond and capable of achieving automatic continuous operation.

Description

Technical field [0001] The invention relates to the field of ships, in particular to a maintenance-free vacuum valve structure used as an accessory of a negative pressure system on a mobile sand suction machine for ships. Background technique [0002] The negative pressure system of the marine mobile sand suction machine refers to a conveying system that uses a vacuum pump to generate system negative pressure, and pumps abrasive, sand and dust and other bulk materials uniformly mixed with air at the receiver to the storage device through a pipeline. In the process of using the negative pressure system, it is necessary to provide different vacuum degrees according to the use occasion and the different materials to be sucked, so that the negative pressure system can achieve the best working condition. In particular, it is required that the negative pressure system cannot exceed the rated vacuum when in use. Exceeding the rated vacuum may not only cause damage to the equipment, but ...

AI Technical Summary

Problems solved by technology

[0004] There are two problems in the solution of the above-mentioned prior art. One is that the cost is relatively high, and sensors, regulating valves and controllers need to be configured. The other is that the adjustment accuracy is affected by the measurement accuracy of the sensor and the adjustment accuracy of the control valve. A problem with a component will affect the degree of vacuum, thereby affecting the spraying speed of the headbox

At the same time, due to the presence of a large number of wearing parts in the regulating valves provided in the prior art, the service life of the regulating valves is usually short and needs to be replaced frequently

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