초록 ▼

In apparatus for the reverse osmosis purification of water or other fluid in a module containing a membrane, the water is forced into the module under pressure using two piston-cylinder assemblies mechanically interconnected with the pressurized fluid from the module applied to the rear face of the

In apparatus for the reverse osmosis purification of water or other fluid in a module containing a membrane, the water is forced into the module under pressure using two piston-cylinder assemblies mechanically interconnected with the pressurized fluid from the module applied to the rear face of the piston which, from its front face, is driving water into the module, a low pressure continuously operating pump providing a low pressure on the other piston to supply the necessary extra pressure. Valve means automatically reverse the functions of the two cylinders at each end of each stroke.

대표청구항 ▼

Apparatus for the reverse osmosis purification of water or other fluid comprising a fluid supply, a module including a reverse osmotic membrane, a fluid inlet and fluid outlet for the passage of fluid over one surface of the membrane and an outlet for the passage of purified fluid out of the module

Apparatus for the reverse osmosis purification of water or other fluid comprising a fluid supply, a module including a reverse osmotic membrane, a fluid inlet and fluid outlet for the passage of fluid over one surface of the membrane and an outlet for the passage of purified fluid out of the module from the opposite surface of the membrane together with a plurality of similar cylinders each having a piston or diaphragm means dividing the cylinder into a front end and a rear end, the front end of each cylinder having a larger swept volume than the rear end, fluid connections connecting the front end of each cylinder to the fluid inlet of the module, a separate non-return valve in each fluid connection from the front end of each cylinder, each said cylinder having its piston or diaphragm means for forcing fluid at a pressure in excess of, at least, the normal osmotic pressure of water from the front face of the piston or diaphragm means through said separate valve to the fluid inlet of the module, operating rod means mechanically interconnecting said piston or diaphragm means, which operating rod means extend from the rear faces of said piston or diaphragm means, said piston or diaphragm means mechanically operating in a cyclic sequence, separate fluid connections have a separate non-return or controlled distribution valve for the front end of each cylinder means arranged for supplying fluid, under a relatively low pressure, compared with the normal osmotic pressure of water, from said fluid supply to the front end of each cylinder through said separate fluid connections with the separate non-return valve or controlled distribution valve therein, and controlled valve means being operative to connect the fluid outlet of the module to the rear ends of said cylinders in synchronism with said cyclic sequence so that all the fluid leaving said fluid outlet flows back to said cylinders into the rear ends thereof in cyclic sequence to drive the piston or diaphragm means towards the front ends, said controlled valve means furthermore being operative to connect said rear ends of each of the cylinders to a discharge in sequence when the respective piston or diaphragm means are moving back towards those ends.