Axially-sealed fluid pressure switcher with reciprocating sliders

Abstract

The invention discloses an axially-sealed fluid pressure switcher with reciprocating sliders. The fluid pressure switcher comprises a high-pressure section shell and a decompression section cylinder which are connected, wherein a fluid (high pressure saline water) inlet pipe, a water pressure cylinder connecting pipe and a decompression connecting pipe are arranged on the high-pressure section shell; a decompression port baffle ring is arranged on the end part of the high-pressure section shell; a high-pressure cavity baffle ring, a distance ring for limiting and fixing the high-pressure cavity baffle ring and a connecting baffle ring are arranged in the high-pressure section shell; four connected pull rods are arranged in the radial center of the high-pressure section shell and the decompression section cylinder; and a fixed sealing block which is matched with the high-pressure cavity baffle ring, a connecting baffle ring sliding sealing block and a decompression port baffle ring sliding sealing block are arranged on the pull rods. The invention has the advantages that: complicated fluid switch is realized by a simple structure, an internal structure is formed by assembling a plurality of small elements, the fluid pressure switcher is easy to process and mount, has high replaceability and is reliably operated, and pressure and flow in the process of getting in and out of the fluid pressure switcher do not wave.

Description

technical field [0001] The invention relates to an axial seal fluid pressure switcher of a reciprocating sliding block, belonging to a component device of a reverse osmosis seawater desalination energy recovery device. Background technique [0002] Reverse osmosis seawater desalination technology has been widely used in my country as a major freshwater resource increment technology. Reverse osmosis seawater desalination is a pressure-driven membrane separation process. The raw seawater needs to be pressurized to 5.5-8.0MPa through a high-pressure pump and enter the reverse osmosis membrane module. About 45% of the raw seawater is separated into desalination through the reverse osmosis membrane. Product water, while the remaining 55% concentrated seawater is discharged in the form of high-pressure brine (pressure>5.0MPa) equivalent to the pressure of raw seawater, resulting in a huge waste of energy. Therefore, using an energy recovery device to efficiently recover and u...

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Problems solved by technology

The disadvantages of this patent design are: first, the sealing surface of the fluid in the switch is the circumferential seal between the piston cylindrical surface and the inner surface of the housing, the device requires high machining accuracy, and the sealing effect of the piston is not easy to guarantee; It is a sandwich structure, and the inner cylinder of the shell is provided with a grid type flow groove, the processing technology is complicated, and the manufacturing cost of the device is relatively high

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