Self-cleaning filter capable of realizing double-sided backwashing

Abstract

The invention relates to a self-cleaning filter capable of realizing double-sided backwashing, comprising a filtering part, a backwashing driving part for driving a dirt suction device assembly to rotate and a high-pressure washing device; the high-pressure washing device comprises a high-pressure washing pump and a high-pressure branch pipe which is arranged on the external wall of a fine filter screen of the filter and is synchronously operated with the dirt suction device assembly; the high-pressure branch pipe is provided with a plurality of nozzles at intervals over against the external wall of the fine filter screen; each nozzle corresponds to each suction nozzle arranged on a dirt suction pipe of the dirt suction device assembly, and the nozzles are oppositely arranged on the internal wall and the external wall of the fine filter screen; water discharged by the high-pressure washing pump is sprayed to the external wall of the fine filter screen via the high-pressure branch pipe and the nozzles and used for washing away or loosening dirt on the internal surface and the external surface of the fine filter screen, so that the dirt can be effectively sucked up by the suction nozzles; in combination with the rotation and translation of a dirt suction device, the internal surface and the external surface of the whole fine filter screen can be completely cleaned; and the self-cleaning filter is more suitable for online purification of a low-pressure circulating water system.

Description

technical field [0001] The invention relates to a filter for purifying industrial circulating water, in particular to a self-cleaning filter which can automatically remove dirt and impurities on the filter net. Background technique [0002] For the basic working principle of the filter for on-line purification of industrial circulating water, please refer to the specifications of multiple Chinese inventions and utility model patents previously applied by the applicant, and its basic structure can be combined with the present invention figure 1 As shown, the raw water is input into the coarse filter chamber 103 from the water inlet 101, and the impurities with large particles in the raw water are intercepted by the coarse filter screen 102, and then enters the fine filter chamber 104, and after being further filtered by the fine filter screen 105, the purified water flows from the water outlet 106 discharge. After filtering for a certain period of time, a layer of impurities...

AI Technical Summary

Problems solved by technology

[0003] The main defect of the above-mentioned backwashing device is: when the filter is used for a long time, it is inevitable that impurities, dirt and sticky deposits that cannot be sucked away by the suction nozzle 202 on the sewage suction device 201 assembly are attached to the fine filter screen. The suction force of the suction nozzle 202 is not enough, and these impurities accumulate over time, which may affect the automatic cleaning effect and service life of the self-cleaning filter, especially in low-pressure raw water systems, the pressure difference between the sewage chamber 108 and the fine filter chamber 104 is small , the suction of the suction nozzle 202 is not enough to remove the above-mentioned various impurities, resulting in poor backwashing effect of the filter and reduced filtration performance after long-term use

[0005] However, even if these backwashing devices are added, first of all, because the adhesion direction of the aforementioned various impurities on the inner wall of the fine filter screen is generally from the inside to the outside, which is consistent with the washing direction of the aforementioned high-pressure water flow, there are still some attached to the The impurities on the inner wall of the fine filter, especially those with strong adhesion, are difficult to completely loosen during the high-pressure flushing process and are absorbed and removed by the suction nozzle 202; The medium has been in a blind spot, and the various attachments attached to the outer wall of the fine filter have not been removed. Long-term use will also affect the filtration efficiency of the filter; third, in low-pressure raw water systems, this filter The defect of poor backwashing effect has not been effectively resolved

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