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Liquid filtration device and method for backwashing

A filter device, liquid technology, applied in the direction of chemical instruments and methods, filtration separation, separation methods, etc.

Active Publication Date: 2015-12-02
CHENGDU INTERMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in this application is to provide a liquid filtration device and method with high filtration efficiency and that can improve the pollution problem of the filter element

Method used

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  • Liquid filtration device and method for backwashing
  • Liquid filtration device and method for backwashing
  • Liquid filtration device and method for backwashing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 2 As shown, when the filter assembly 2 is in a cycle of filtering state, the operation mode switching control valve 3 is first in the closed state, that is, the filter assembly 2 operates in the first filter mode, and when the first filter mode operates for a period of time, the operation mode is switched The control valve 3 is opened, and the filter assembly 2 continues to operate in the second filter mode. After that, the filter assembly 2 enters a cycle of backwashing state. In this backwashing state, the operation mode switching control valve 3 is always open. Wherein, when the first filtration mode is switched to the second filtration mode, the operation mode switching control valve 3 can be triggered and opened by a set threshold. The threshold may be time, but it is preferably the filtration pressure difference between both sides of the filter element 202 . In this embodiment, it is preferable to open the operation mode switching control valve 3 w...

Embodiment 2

[0025] Such as image 3 As shown, when the filter assembly 2 is in a cycle of filtering state, the operation mode switching control valve 3 is first in an open state, that is, the filter assembly 2 operates in the second filter mode, and when the second filter mode operates for a period of time, the operation mode is switched The control valve 3 is closed, and the filter assembly 2 continues to operate in the first filter mode. After that, the filter assembly 2 enters a cycle of backwashing state. In this backwashing state, the operation mode switching control valve 3 is always open.

Embodiment 3

[0027] Such as Figure 4 As shown, when the filter assembly 2 is in a cycle of filtering state, the operation mode switching control valve 3 is first in the closed state, that is, the filter assembly 2 operates in the first filter mode, and when the first filter mode operates for a period of time, the operation mode is switched The control valve 3 is opened and the filter assembly 2 continues to operate in the second filter mode. When the second filter mode has been operated for a period of time, the operation mode switching control valve 3 is closed, and the filter assembly 2 continues to operate in the first filter mode. After that, the filter assembly 2 enters a cycle of backwashing state. In this backwashing state, the operation mode switching control valve 3 is always open. Similar to Embodiment 1, when the first filtration mode is switched to the second filtration mode, it is equivalent to cleaning the filter element 202 once, thereby prolonging the filtration time.

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Abstract

The invention discloses a liquid filtering device and method, which are high in filtering efficiency and can improve the pollution problem of a filtering element. The filtering device convenient to backwash comprises a filtering component positioned on a circulation flow passage; during the running process of the filtering component, when a to-be-filtered liquid passes through the filtering element from inward to outward, and a filtered liquid is discharged from a third end opening, the filtering component is at the filtering state; when a backwashing liquid enters a fourth end opening and passes through the filtering element from outward to inward, the filtering component is at the backwashing state; the filtering state and the backwashing state of the filtering component are switched periodically, and moreover, a second end opening and the circulation flow passage are connected through a running mode switch control valve, during the process that the filtering component is at the filtering state, the running mode switch control valve is always shut off or at least is shut off at partial time sections; during the process that the filtering component is at the backwashing state, the running mode switch control valve is started.

Description

Technical field [0001] The invention relates to a liquid filtering device and a method that are beneficial to backwashing. Background technique [0002] There are two most commonly used filter element forms in the field of liquid filtration. One is a tubular filter element with one end closed and the other end open. The filter element is installed in the housing of the filter assembly through an orifice plate at the open end. Under the action, it penetrates from the outside of the filter element into the cavity of the filter element, and then flows out from the open end of the filter element to become filtered liquid; the other is a tubular filter element with open ends, which is installed in the filter assembly through the orifice plates at both ends. In the housing, a closed cavity is formed between the filter element and the housing. When filtering, the filtrate to be filtered enters the cavity of the filter element from the front end of the filter element under pressure, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D35/12
Inventor 高麟汪涛樊彬
Owner CHENGDU INTERMENT TECH