Gas-oil pressure converter

Abstract

The invention provides a gas / hydraulic power converter enabling the flexibility of the design of an accumulation part and the easy reduction in size of a drive part. This gas / hydraulic power converter for converting a gas pressure into a hydraulic pressure and supplying the hydraulic pressure to an operating machine operating valves installed in a pipeline comprises a hollow cylinder closed at both end parts by covers, a rod supported on the covers coaxially with the center axis of a cylinder, a piston slidably supported on the rod inside the cylinder and formed to receive and discharge a gas on one side of the cylinder and receive and supply a hydraulic pressure on the other side, and a limit switch for starting an oil pump operated by the rod formed by extending to be passed from the covers to the outside. The rod is supported axially movably relative to the covers, and the movement of the rod is performed by a specified length according to the movement of the piston by a gas pressure.

Description

Technical field [0001] The present invention relates to a gas-oil pressure converter used in a gas-hydraulic drive device used as an actuator for operating valves and the like. Background technique [0002] In the past, a gas-hydraulic drive unit was used as a power source for driving. The high-pressure gas of the pipeline used for the operation of the pipeline ball valve was converted into a converter for hydraulic pressure. The converter was installed vertically without using a piston. Vertical. At this time, rubber membranes are often used to isolate gas and oil inside the converter. [0003] Considering the problems in the past, the pressure of nitrogen in the gas tank as the accumulator is used as the power source, and the piston used in the gas-oil pressure converter that converts to oil pressure is used as described in Patent Literature 1—The device described in Japanese Patent Application Laid-Open No. 8-54083 that converts air pressure into oil pressure by means of a pis...

AI Technical Summary

Problems solved by technology

[0004] When an air-oil pressure converter that does not use the above-mentioned piston is used for the drive unit, it has to be installed vertically, making it impossible to downsize the drive unit

In addition, in order to isolate gas and oil, when using a rubber membrane, due to the equal pressure of gas and oil, the gas permeates the gas membrane and mixes into the oil during long-term use, which may cause poor operation of the drive device.

[0005] In addition, when the gas-oil pressure converter uses a piston pressurization method, a small rod is arranged at the top of the piston rod. Since the small rod only protrudes outward with the same stroke length as the stroke of the piston, it is necessary to have a Indicators or protective caps that protrude out of the cylinder, so there is a problem with the overall length becoming longer

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