Multi-layer automatic back-flushing liquid filtering device and method

Abstract

The invention relates to the technical field of liquid filtering, in particular to a multi-layer automatic back-flushing liquid filtering device and method.The multi-layer automatic back-flushing liquid filtering device comprises a shell and a filter element, during use, liquid to be filtered flows into the lower portion of a first cavity from a first water inlet and is filtered layer by layer through the filter element, and the filtered liquid flows into a second cavity from a second water outlet; when the filtered liquid needs to be used, the purified water outlet is opened to discharge the liquid, when backwashing is needed, the first water outlet is opened, the filter piece is subjected to backwashing and impurity removal by utilizing the dual effects of the gravity of the liquid in the second cavity and compressed air, the filter piece is a multi-layer filter layer, and the filter precision is gradually increased from outside to inside. The backwashing does not depend on the pressure of an external water source and the movement of a mechanical part, so that the condition that impurities are not cleaned thoroughly due to the problems of unstable pressure, mechanical wear and the like is avoided, the impurities on a filter element can be effectively cleaned, and the defects of an existing backwashing mode are overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid filtration, and in particular to a multi-level automatic backflushing liquid filtration device and method. Background Art

[0002] Liquid filtration devices play a vital role in industrial, commercial, and domestic water treatment. Their primary function is to remove impurities from liquids to meet the water quality requirements of various applications. However, most existing liquid filtration devices lack automatic backwashing capabilities.

[0003] Existing announcement number CN222342130U discloses a backwash filter, comprising a housing, a bottom plate disposed below the housing, a filtering device disposed within the housing, the filtering device comprising a filtering portion, the filtering portion being provided with a motor, a mounting rod, a filter cartridge, a spiral scraper, a sleeve, a spring, a slip ring, and a second gasket. The backwash filter filters water by providing a motor, a mounting rod, a filter cartridge, and a spiral scraper using the filter cartridge, and when the motor is started, the motor drives the mounting rod and the spiral scraper, causing the spiral scraper to clean the outer surface of the filter cartridge; and by providing a nozzle, a circular pipe, a connecting pipe, and a water pump, and when the water pump is started, the filtered water is extracted and introduced into the circular pipe through the connecting pipe and sprayed out from the nozzle, so that the water passes from the inside of the filter cartridge to the outside of the filter cartridge, causing impurities adhered to the outer surface of the filter cartridge to be washed off the filter cartridge, causing the impurities to float in the water outside the filter cartridge, facilitating the impurities to be discharged along the sewage outlet, thereby having a backwash function.

[0004] However, the aforementioned backwash filter mechanically cleans the outer surface of the filter cartridge using a motor-driven spiral scraper, combined with hydraulic flushing provided by a water pump. This backwashing method relies on the pressure of an external water source and the movement of mechanical components. Due to unstable pressure, mechanical wear, limited range of motion, and poor synergy, impurities on the filter cartridge surface may not be completely removed. In particular, when pressure is insufficient or mechanical components are worn, it is difficult to effectively remove attached impurities, resulting in incomplete cleaning. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-level automatic backwashing liquid filtration device and method, which solves the problem that the existing backwashing filter relies on the pressure of an external water source and the movement of mechanical parts, and may not be cleaned thoroughly.

[0006] To achieve the above-mentioned object, the present invention provides a multi-level automatic backflushing liquid filtering device, comprising a housing and a filter element;

[0007] The interior of the shell has a first cavity and a second cavity, the second cavity is located above the first cavity, the filter element is located in the first cavity, the shell has a first water inlet, a second water inlet and a clean water outlet, the first water inlet is located above the first cavity, the second water inlet is located at the connection between the second cavity and the filter element, and the clean water outlet is located above the second cavity.

[0008] Wherein, the shell has a first water outlet, and the first water outlet is located at the bottom of the first cavity.

[0009] Wherein, the filter element includes a connector and a multi-layer sintered mesh, the connector is connected to the shell, and the multi-layer sintered mesh is fixedly connected to the connector respectively.

[0010] Wherein, the connecting head has a second water outlet, and the second water outlet is connected to the second water inlet.

[0011] A multi-level automatic backwashing liquid filtration method comprises the following steps:

[0012] The liquid to be filtered flows into the lower part of the first cavity from the first water inlet;

[0013] The liquid is filtered layer by layer by the filter element, and the filtered liquid flows into the second cavity from the second water outlet;

[0014] When the filtered liquid needs to be used, open the purified water outlet to discharge the liquid.

[0015] When the filtered liquid needs to be used, the purified water outlet is opened to discharge the liquid, and the steps further include:

[0016] When backwashing is required, the first water outlet is opened, and the filter element is backwashed by utilizing the dual effects of the liquid gravity in the second cavity and the compressed air to remove impurities on the filter element.

[0017] Wherein, the filter element is a multi-layer filter layer, and the filtering accuracy of the multi-layer filter layer increases from the outside to the inside.

[0018] The present invention relates to a multi-level automatic backwash liquid filtration device and method. When in use, the liquid to be filtered flows from the first water inlet into the lower part of the first cavity, is filtered layer by layer by the filter element, and the filtered liquid flows into the second cavity from the second water outlet. When the filtered liquid is needed, the clean water outlet is opened to discharge the liquid. When backwashing is required, the first water outlet is opened, and the dual effects of the gravity of the liquid in the second cavity and compressed air are used to backwash the filter element to remove impurities. The filter element has multiple filter layers, and the filtration accuracy increases from the outside to the inside. Its backwashing does not rely on external water source pressure or the movement of mechanical components, avoiding the situation where impurity cleaning is not thorough due to problems such as unstable pressure and mechanical wear. It can effectively remove impurities on the filter element, solving the shortcomings of existing backwashing methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0020] Figure 1 It is a schematic diagram of a multi-level automatic backwash liquid filtering device according to a first embodiment of the present invention.

[0021] Figure 2 1 is a schematic diagram of a filter element according to a first embodiment of the present invention.

[0022] Figure 3 1 is a flow chart of the steps of a multi-level automatic backwash liquid filtration method according to a second embodiment of the present invention.

[0023] In the figure: 101-housing, 102-first cavity, 103-second cavity, 104-first water inlet, 105-second water inlet, 106-purified water outlet, 107-first water outlet, 108-connector, 109-sintered mesh, 110-second water outlet. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] The first embodiment of this application is:

[0026] See also Figure 1 and Figure 2 ,in, Figure 1 It is a schematic diagram of a multi-level automatic backwash liquid filtering device according to a first embodiment of the present invention. Figure 2 1 is a schematic diagram of a filter element according to a first embodiment of the present invention.

[0027] The present invention provides a multi-level automatic backwash liquid filtration device: comprising a shell 101 and a filter element, wherein the interior of the shell 101 has a first cavity 102 and a second cavity 103, the shell 101 has a first water inlet 104, a second water inlet 105, a clean water outlet 106 and a first water outlet 107, the filter element comprises a connector 108 and a multi-layer sintered mesh 109, and the connector 108 has a second water outlet 110. The above-mentioned solution solves the problem that the existing backwash filter relies on the pressure of an external water source and the movement of mechanical components, and may not be cleaned thoroughly.

[0028] In this specific embodiment, the interior of the housing 101 has a first cavity 102 and a second cavity 103. The second cavity 103 is located above the first cavity 102, and the filter element is located within the first cavity 102. The housing 101 has a first water inlet 104, a second water inlet 105, and a purified water outlet 106. The first water inlet 104 is located above the first cavity 102, the second water inlet 105 is located at the connection between the second cavity 103 and the filter element, and the purified water outlet 106 is located above the second cavity 103. The housing 101 is divided into three parts: upper, middle, and lower. The lower part of the first cavity 102 is where tap water flows through, the middle part is where the filter element is located, and the upper part of the second cavity 103 is where filtered purified water or compressed air flows through. Tap water first flows into the lower part from the first water inlet 104, and then flows out from the clean water outlet 106 at the upper part of the second cavity 103 after being filtered by the filter element. The filter element is a cylinder, and the whole is made of a stainless steel sintered mesh 109, which is injection molded or welded with stainless steel plates to achieve a completely sealed state. The filter element is arranged at the lower part of the shell 101. Except for the second water outlet 110 of the filter element, the lower and upper parts are completely sealed. The clean water outlet 106 is arranged at the upper part of the shell 101, but not at the top. A first water outlet 107 is also provided at the lower part of the shell 101.

[0029] The housing 101 has a first water outlet 107 , and the first water outlet 107 is located at the bottom of the first cavity 102 .

[0030] Secondly, the connector 108 is connected to the outer shell 101, and the multi-layer sintered mesh 109 is fixedly connected to the connector 108 respectively. Taking the stainless steel sintered mesh 109 cylinder as an example, the sintered mesh 109 has at least two layers, inner and outer, and the sintered mesh 109 with different densities is used to achieve different filtration accuracy requirements; the bottoms of the two different layers of sintered mesh 109 are sealed separately, and the tops are sealed at the same time through the connector 108, leaving a water outlet at the top, that is, the second water outlet 110. The multi-layer sintered mesh 109 must follow the filtration accuracy from the outside to the inside. For example, if the filtration accuracy of the outer filter layer is 40μm, the filtration accuracy of the inner filter layer must exceed 40μm, such as 20μm or 15μm.

[0031] At the same time, the connector 108 has a second water outlet 110 , and the second water outlet 110 is connected to the second water inlet 105 .

[0032] Using the multi-level automatic backwash liquid filtration device of this embodiment, during normal operation, after the tap water in the lower portion of the first chamber 102 is filled, it passes through the filter element and is filtered. The filtered water then flows through the second water outlet 110 into the upper portion of the second chamber 103, causing the water level in the upper portion to rise. When purified water is needed, the purified water outlet 106 is opened for access. The basic water level in the upper portion of the housing 101 may fluctuate slightly due to changes in water pressure. If the water pressure is too low, the purified water level may fall below the purified water outlet 106. When the purified water outlet 106 is opened, the water level rapidly rises to the same level as or even slightly above the purified water outlet 106. Under no circumstances will the purified water level reach the top of the device, leaving compressed air between the water level and the top. When the first water outlet 107 is opened, the purified water level rapidly drops due to the combined forces of gravity of the purified water in the upper portion and the compressed air, and the purified water backwashes the filter element through the second water outlet 110 of the filter element. Therefore, whether two or multiple layers of filtration are used, flushing can be performed simultaneously without affecting filtration effectiveness or causing clogging. Practical applications can implement multi-layer filtration using the filter element as needed. For example, waterworks and sewage treatment plants can utilize this technology to achieve additional layers of filtration as needed. This technology is also suitable for PP cotton or any other filter layer, as long as the design adheres to the principle of "outside-in, layer-by-layer" filtration accuracy. Backwashing is independent of external water pressure and mechanical component movement, avoiding incomplete impurity removal due to unstable pressure and mechanical wear. It effectively removes impurities from the filter element, addressing the shortcomings of existing backwashing methods.

[0033] The second embodiment of this application is:

[0034] Based on the first embodiment, please refer to Figure 3 ,in, Figure 31 is a flow chart of the steps of a multi-level automatic backwash liquid filtration method according to a second embodiment of the present invention.

[0035] A multi-level automatic backflushing liquid filtration method of this embodiment includes the following steps:

[0036] S201: The liquid to be filtered flows into the lower part of the first cavity 102 from the first water inlet 104;

[0037] S202: The liquid is filtered layer by layer through the filter element, and the filtered liquid flows into the second cavity 103 through the second water outlet 110;

[0038] S203: When the filtered liquid needs to be used, the purified water outlet 106 is opened to discharge the liquid.

[0039] S204: When backwashing is required, the first water outlet 107 is opened, and the filter element is backwashed by utilizing the dual effects of the gravity of the liquid in the second cavity 103 and the compressed air to remove impurities on the filter element.

[0040] Specifically, during normal operation, after the lower portion of the first cavity 102 is filled with tap water, it is filtered through the filter element. The filtered water then flows through the second water outlet 110 into the upper portion of the second cavity 103, causing the water level in the upper portion to rise. When purified water is needed, the purified water outlet 106 is opened for access. The basic water level in the upper portion of the housing 101 may fluctuate slightly due to changes in water pressure. If the water pressure is too low, the purified water level may fall below the purified water outlet 106. When the purified water outlet 106 is opened, the water level rapidly rises to the same level as, or even slightly above, the purified water outlet 106. Under no circumstances will the purified water level reach the top of the device, leaving compressed air between the water level and the top. When the first water outlet 107 is opened, the purified water level rapidly drops due to the combined forces of gravity of the purified water in the upper portion and the compressed air. The purified water then flows through the second water outlet 110 of the filter element to backwash the filter element. Therefore, whether two or multiple layers of filtration are used, flushing can be performed simultaneously without affecting filtration effectiveness or causing clogging. Practical applications can implement multi-layer filtration using the filter element as needed. For example, waterworks and sewage treatment plants can utilize this technology to achieve additional layers of filtration as needed. This technology is also suitable for PP cotton or any other filter layer, as long as the design adheres to the principle of "outside-in, layer-by-layer" filtration accuracy. Backwashing is independent of external water pressure and mechanical component movement, avoiding incomplete impurity removal due to unstable pressure and mechanical wear. It effectively removes impurities from the filter element, addressing the shortcomings of existing backwashing methods.

[0041] The above disclosure is merely one or more preferred embodiments of the present application and is not intended to limit the scope of the present application. A person skilled in the art will understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.

Claims

1. A multi-level automatic backflushing liquid filtration device, comprising a housing, characterized in that: Also includes filters; The interior of the shell has a first cavity and a second cavity, the second cavity is located above the first cavity, the filter element is located in the first cavity, the shell has a first water inlet, a second water inlet and a clean water outlet, the first water inlet is located above the first cavity, the second water inlet is located at the connection between the second cavity and the filter element, and the clean water outlet is located above the second cavity.

2. The multi-level automatic backflushing liquid filtration device according to claim 1, characterized in that: The shell has a first water outlet, and the first water outlet is located at the bottom of the first cavity.

3. The multi-level automatic backflushing liquid filtration device according to claim 1, characterized in that: The filter element includes a connector and a multi-layer sintered mesh. The connector is connected to the shell, and the multi-layer sintered mesh is fixedly connected to the connector respectively.

4. The multi-level automatic backflushing liquid filtration device according to claim 3, characterized in that: The connector has a second water outlet, and the second water outlet is communicated with the second water inlet.

5. A multi-level automatic backflushing liquid filtration method, applicable to the multi-level automatic backflushing liquid filtration device according to any one of claims 1 to 4, characterized in that: The following steps are involved: The liquid to be filtered flows into the lower part of the first cavity from the first water inlet; The liquid is filtered layer by layer by the filter element, and the filtered liquid flows into the second cavity from the second water outlet; When the filtered liquid needs to be used, open the purified water outlet to discharge the liquid.

6. The multi-level automatic backflushing liquid filtration method according to claim 5, characterized in that: When the filtered liquid needs to be used, the purified water outlet is opened to discharge the liquid, and the steps further include: When backwashing is required, the first water outlet is opened, and the filter element is backwashed by utilizing the dual effects of the liquid gravity in the second cavity and the compressed air to remove impurities on the filter element.

7. The multi-level automatic backflushing liquid filtration method according to claim 5, characterized in that: The filter element comprises multiple filter layers, and the filtering accuracy of the multiple filter layers increases from the outside to the inside.

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