Differential pressure adjusting cylinder for mechanical seal

Abstract

The invention discloses a differential pressure adjusting cylinder for mechanical seal. The differential pressure adjusting cylinder for mechanical seal comprises a cylindrical shell, and first and second end covers at the two ends, wherein the cylindrical shell has a cylinder barrel inside; and a first gap and a heat exchange coil are arranged between the cylinder barrel and the cylindrical shell. The lower end of the cylinder barrel and the inner side surface of the second end cover are tightly connected; and a second gap is left between the upper end of the cylinder barrel and the lower side surface of the first end cover. A rod hole is formed in the center of the first end cover; a transparent glass pipe is arranged at the outer side of the first end cover; and the periphery of one end of the transparent glass pipe is connected to the periphery of the rod hole. A piston rod is arranged in the rod hole; the inner end of the piston rod extends into the cylinder barrel, and is connected with a piston; and a liquid sealing cavity and a medium cavity are respectively formed in the two sides of the piston. The outer end of the piston rod penetrates through the first end cover to extend into the transparent glass pipe. A sealing liquid inlet is formed in the outer circle of the first end cover; and a medium inlet and a sealing liquid outlet are formed in the second end cover. The differential pressure adjusting cylinder for mechanical seal can prolong the service life of a mechanical sealing system, can supply sealing liquid to a machine pump and a mechanical sealing auxiliary system, and prevents a medium in the machine pump from leaking.

Description

technical field [0001] The invention relates to a hydraulic cylinder. Specifically, it is a differential pressure regulating cylinder used to provide sealing fluid for the pump and mechanical seal auxiliary system, and to avoid medium leakage in the pump. Background technique [0002] At present, in the petrochemical field, pipelines and pumps are used to transport various liquid chemical raw materials. Most of the chemical raw materials are flammable, explosive, toxic and harmful materials. Therefore, when transporting flammable, explosive, toxic and harmful materials, it is necessary to prevent the leakage of flammable, explosive, toxic and harmful materials. The traditional method is to install a mechanical seal auxiliary system at the end of the wheel shaft close to the pump, and the mechanical seal auxiliary system provides the sealing liquid, so that the sealing liquid circulates between the two seals, and the pressure of the sealing liquid is higher than the pressur...

AI Technical Summary

Problems solved by technology

However, in actual production, if the pressure of the chemical material being transported in the pump is high and fluctuates greatly, the setting value of the sealing fluid pressure in the sealing chamber outside the pump must be higher than the maximum pressure fluctuation value of the chemical material being transported. Make the seal on the outside of the pump run under high pressure conditions for a long time, which will shorten the service life of the mechanical seal system and make the service life of the mechanical seal system not long

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