WO2010050848A1 - Diaphragm pump - Google Patents

Abstract

The diaphragm pump (3), for supplying salt water to a desalinator (10) at a high pressure, comprises a body, the inner cavity of which is divided into three isolated sections by two symmetrically arranged flexible diaphragms. The central section (Б) is provided with a salt water inlet and an outlet for supplying the salt water to the desalinator (10). The side sections (A, B) contain a high viscosity liquid; furthermore, a multiplier (7) acting on the flexible diaphragm through the high-viscosity liquid, when the brine, flowing into the first side section from the desalinator (10), performs an action thereon, is accommodated in the first side section. A reciprocating plunger (4) is arranged in the second side section so that an action is produced on the flexible diaphragm through the high-viscosity liquid.

Description

 Diaphragm pump

Technical field

The alleged invention relates to diaphragm pumps, more specifically to diaphragm pumps for supplying high-pressure salt water to a desalination plant of reverse osmosis plants for the purification and desalination of sea water.

BACKGROUND OF THE INVENTION JVf-! 2007109399, published on September 20, 2008, and application N ° 2007130523, published on February 20, 2009, a diaphragm pump for supplying high-pressure salt water to a desalination plant, the internal cavity of the casing of which is divided by two symmetrically mounted flexible diaphragms into three insulated sections, the central of which is made with an input for receiving salt water and with an outlet for supplying salt water to the desalination plant, the side sections contain a liquid with a high viscosity, while a multiplier acting on a flexible diameter is installed in the first of the side sections Ragmi through the liquid with high viscosity, when exposed to the brine entering the first side section of the distiller.

A disadvantage of the known high-pressure diaphragm pump for supplying salt water to the desalination plant is the presence of an hydraulic oil actuator acting on the flexible diaphragm, which complicates the design and increases its cost. Disclosure of invention

The technical result achieved in the claimed invention is to simplify the design and operation, increase compactness and increase the reliability of the diaphragm pump, reducing its cost.

The indicated technical results are achieved in a diaphragm pump for supplying high-pressure salt water to a desalination plant, the internal cavity of the casing of which is divided by two symmetrically mounted flexible diaphragms into three isolated sections, the central of which is made with an input for receiving salt water and with an output for supplying salt water into desalination plant, the side sections contain a liquid with a high viscosity, while in the first of the side sections there is a multiplier acting on the flexible diaphragm through the liquid be highly viscous, when exposed to the brine entering the first side section of the distiller, and the second side section of the plunger is mounted with the possibility of reciprocating movement and effects on the flexible diaphragm through the high viscosity liquid. The central section can be made with an inlet equipped with a valve for receiving salt water under a pressure of 2.3 kg / cm ² and with an outlet equipped with a valve for supplying salt water to a desalination plant with a pressure of 59 kg / cm.

Brief Description of the Drawings

Ha FIG. 1 shows a schematic diagram of the claimed diaphragm pump for supplying high-pressure salt water to a desalination plant. The implementation of the invention

The arrangement and operation of the claimed diaphragm pump is illustrated using the circuit shown in FIG. 1, taking into account its interaction with other devices that are part of the desalination plant reverse osmosis for the purification and desalination of sea water, including:

1 - pipeline supply of salt water under low pressure, about 2.5 kg / cm ² ); 2 - entrance with a check valve into the central section;

3 - diaphragm high pressure pump;

4 - a plunger;

5 - plunger drive;

6 - aperture; 7 - multiplier piston;

8 - exit with a check valve from the central section;

9 - pipeline supply of salt water of high pressure;

10 - a block of membrane elements (desalination);

11 - pipeline desalination of desalinated water; 12 - high pressure brine outlet pipe;

13 - valve distribution of brine;

14 - brine discharge pipe.

The diaphragm pump 3 includes three diaphragms 6, a piston of the multiplier 7 and has a cavity B for salt water, cavity A for a liquid with a high viscosity, compressible pressure of about 60 kg / cm ² , cavities B and D for a liquid with a high viscosity to transfer brine energy through diaphragm 6 to the plunger piston and further diaphragm 6 for supplying salt water. The internal cavity of the pump casing 3 is divided by two symmetrically mounted flexible diaphragms 6 into three isolated sections A, B, B. The central section B is connected at the inlet through a check valve 2 with a salt water supply device 1 under a pressure of 2.3 - - .2.5 kg / cm ² , and at the outlet through a non-return valve 8 with a pressure of 59 ... 60 kg / cm ² with an inlet 9 into the desalination unit 10. Side section A is connected to the plunger 4 with cyclic compression from the fluid drive 5 to a pressure of 59 ... 60 kg / cm ² . The actuator 5 can be made in the form of a cam mechanism or a crank mechanism that provides a cyclic reciprocating movement of the plunger 4. The lateral section B through the multiplier 7 is connected to the distribution valve of the brine 13 connected to the drain 14 and to the desalination unit 10. The diaphragm pump 3 with the multiplier 7 increases the pressure of the brine leaving the desalination plant 10 to 59 ... 60 kg / cm. The brine after the distributor 13 falls periodically into the side section D of the high-pressure pump 3, acting on the third diaphragm 6, which is located in the pump casing 3 between the cavities G and D, or on the drain 14. The ratio of the squares of the larger and smaller diameter of the multiplier piston is equal to the ratio of the pressures in salt water pressure line 9 and brine line 12. D ² . Salted water 60 = 1,053 for medium salted sea water,

U 'brine e' where

D is the larger diameter of the multiplier piston; d is the smaller diameter of the multiplier piston; Brine water - pressure in the line 9 of the salt water supply to the desalination plant; P _brine - pressure in line 12 of the brine outlet from the desalination plant. Desalination plant reverse osmosis works as follows. From the pipeline 1, through the check valve 2, salt water enters the cavity B of the hydraulic cylinder and bends outward of the diaphragm 6. After filling the cavity B with water, a sufficient force is applied to create the osmotic pressure in the membrane elements of the desalination unit 10, and a brine under high pressure from past cycles and presses on the plunger piston and diaphragm 6. Cavities A, B, D filled with a high-viscosity fluid transmit pressure, and diaphragms 6 in cavity B pump salt water under high pressure through the check valve 8 into the pipeline 9. Part of the water is supplied by moving the plunger 4, and the other part by moving the piston of the multiplier 7. Water from the pipe 9 enters the membrane elements of the desalination unit 10 and through the pipe 11 the desalinated water leaves the installation. The brine formed during desalination under high pressure enters the pipeline 12 and from it into the distribution valve of the brine 13, through which, during injection, the brine under high pressure is fed into the cavity D. When filling the cavity B with water, the brine from the cavity D is discharged through valve 13 into the pipeline fourteen.

Claims

Claim 1. A diaphragm pump for supplying high-pressure salt water to the desalination plant, the internal cavity of the casing of which is divided by two symmetrically mounted flexible diaphragms into three isolated sections, the central of which is made with an input for receiving salt water and with an outlet for supplying salt water to the desalination unit, side sections contain a liquid with high viscosity, while in the first side section there is a multiplier acting on the flexible diaphragm through a liquid with high viscosity, when exposed to sol entering the first side section of the distiller, characterized in that it further comprises a plunger mounted in the second side section, with reciprocating movement and effects on the flexible diaphragm through the high viscosity liquid. 2. The diaphragm pump according to claim 1, characterized in that the central section is made with an inlet for receiving salt water under a pressure of more than 2.3 kg / cm and with an outlet for supplying salt water to a desalination plant with a pressure of 59 kg / cm ²