Patent ID: 7048839
Filing Date: 2006-05-23
Classification: C25B,Y02E,Y02P

Abstract:
1. A system for generating high pressure hydrogen by direct electrolysis of pure water using an electrolysis cell comprising polyelectrolyte membranes, wherein an electrolysis cell disposed in hydrogen gas generated and stored in a high pressure vessel that serves as a storage tank of hydrogen generated and electrolysis pure water stored in another high pressure vessel that communicates with the electrolysis cell and serves as a storage tank of oxygen generated, wherein the system has pressure control means for controlling a differential pressure between the inner pressure of the high pressure vessel for storing hydrogen and the inner pressure of the high pressure vessel for storing oxygen to a pressure below the pressure resistance of the electrolysis cell, wherein the pressure control means is provided for adjusting the differential pressure to a pressure below the pressure resistance of the electrolysis cell by allowing pure water to be transferred by switching the valves in the vessels connected to pipe lines communicating with the pure water in the respective high pressure vessels, and wherein the pressure control means has a differential pressure gauge which is comprising: a cylinder of a non-magnetic material having both ends sealed with elastic bellows disposed in the axial direction by the pressures of respective high pressure vessels and filled with an inert fluid; a main unit comprising an internal magnetic body provided in close contact with the inner surface of the cylinder and an external magnetic body provided in close contact with the outer surface of the cylinder; and a sensor for sensing the differential pressure based on the position of the external magnetic body that changes by elastic deformation of the bellows.