Filtration device

Abstract

This invention provides a filtration device, comprising: a receiving cavity for containing particulate filter media, the receiving cavity including a first sub-receiving cavity, a second sub-receiving cavity, and a third sub-receiving cavity connected sequentially along the flow direction of the liquid to be filtered; the bottom of the first sub-receiving cavity is connected to the top of the second sub-receiving cavity, and the bottom of the second sub-receiving cavity is connected to the top of the third sub-receiving cavity; along the flow direction of the liquid to be filtered, the cross-sectional area of ​​the first sub-receiving cavity gradually decreases, the cross-sectional area of ​​the second sub-receiving cavity remains constant, and the cross-sectional area of ​​the third sub-receiving cavity gradually increases; the top of the first sub-receiving cavity is provided with a liquid inlet; an arched filter screen, including: a first screen body arched towards the liquid inlet; and a support portion, one end of which is connected to the outer periphery of the first screen body and is sealed to the inner wall of the second sub-receiving cavity. Using the above solution, the service life of the particulate filter media can be extended and the backwashing effect can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of liquid purification, and more particularly to a filtration device. Background Technology

[0002] Filtration devices play a crucial role in semiconductor pure water systems, primarily removing large molecular organics, iron oxides, and residual chlorine from the water. These impurities can negatively impact subsequent water treatment processes; the filtration device includes granular filter media for filtering the liquid.

[0003] However, existing filtration devices suffer from reduced lifespan and backwashing efficiency of particulate filter media. Extending the lifespan of particulate filter media and improving backwashing efficiency has become a challenge. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide a filtration device that extends the service life of particulate filter media and improves the backwashing effect.

[0005] This invention provides a filtration device for extending the service life of particulate filter media and improving backwashing effect. The device includes: a receiving cavity for accommodating the particulate filter media, the receiving cavity comprising a first sub-receiving cavity, a second sub-receiving cavity, and a third sub-receiving cavity connected sequentially along the flow direction of the liquid to be filtered; the bottom of the first sub-receiving cavity is connected to the top of the second sub-receiving cavity, and the bottom of the second sub-receiving cavity is connected to the top of the third sub-receiving cavity; wherein, along the flow direction of the liquid to be filtered, the cross-sectional area of ​​the first sub-receiving cavity gradually decreases, the cross-sectional area of ​​the second sub-receiving cavity remains constant, and the cross-sectional area of ​​the third sub-receiving cavity gradually increases; an inlet is provided at the top of the first sub-receiving cavity; and an arched filter screen, comprising: a first mesh body arched towards the inlet; and a support portion, one end of which is connected to the outer periphery of the first mesh body and is sealed to the inner wall of the second sub-receiving cavity.

[0006] Optionally, the arched filter screen further includes: a second mesh body, the other end of which is connected to the outer periphery of the second mesh body; the cross-section of the second mesh body perpendicular to the flow direction of the liquid to be filtered is parallel to the plane where the bottom of the second sub-receiving cavity is located; the top end face of one end of the support portion and the bottom of the first sub-receiving cavity are located in a first plane, and the bottom end face of the other end of the support portion and the bottom of the second sub-receiving cavity are located in a second plane.

[0007] Optionally, the first sub-receiving cavity is an upper frustum that is larger at the top and smaller at the bottom, the second sub-receiving cavity is a cylinder with openings at both ends, and the third sub-receiving cavity is a lower frustum that is smaller at the top and larger at the bottom.

[0008] Optionally, the particulate filter medium includes one or more of the following: resin particles, montmorillonite particles, ion exchange fiber particles, and activated carbon particles.

[0009] Optionally, the bottom of the third sub-receiving cavity is provided with a bottom filter screen for supporting the particulate filter medium.

[0010] Optionally, the filtering device further includes: a connecting rod, one end of which is detachably and fixedly connected to the arched filter screen; and a motor, the other end of which is connected to the motor to drive the arched filter screen to move forward and backward along the axial extension direction of the receiving cavity.

[0011] Optionally, the filtration device further includes: a fourth sub-receptacle, the top of which is connected through to the bottom of the third sub-receptacle; and a pH meter located on the inner wall of the fourth sub-receptacle.

[0012] Optionally, the filtration device further includes: a first residual chlorine tester located in the first sub-containment cavity, and a second residual chlorine tester located in the fourth sub-containment cavity.

[0013] Optionally, the device further includes a turbidimeter located on the outer wall of the fourth sub-receiving cavity.

[0014] Optionally, the filtration device further includes: a multi-layer pressure sensor located in the third sub-receptacle and arranged along the flow direction of the liquid to be filtered, for detecting the increase in interlayer pressure difference.

[0015] Compared with the prior art, the technical solution of the embodiments of the present invention has the following advantages: The filtration device provided in this embodiment of the invention includes: a first sub-receptacle, a second sub-receptacle, and a third sub-receptacle connected sequentially along the flow direction of the liquid to be filtered. Along the flow direction of the liquid to be filtered, the cross-sectional area of ​​the first sub-receptacle gradually decreases, the cross-sectional area of ​​the first sub-receptacle remains constant, and the cross-sectional area of ​​the third sub-receptacle gradually increases. The top of the first sub-receptacle is provided with a liquid inlet; an arched filter screen includes: a first mesh body arched towards the liquid inlet; and a support portion, one end of which is connected to the outer periphery of the first mesh body and sealed to the inner wall of the second sub-receptacle. When filtering the liquid to be filtered, the particulate filter medium is located in the third sub-receptacle. Along the flow direction of the liquid to be filtered, the cross-sectional area of ​​the third sub-receptacle gradually increases, the overall flow velocity of the liquid to be filtered decreases, and the radial flow velocity distribution of the liquid to be filtered tends to be uniform, so that the particulate filter medium participates in filtration synchronously, the particulate filter medium is saturated synchronously, the utilization rate is improved, thereby extending the service life of the particulate filter medium. When backwashing the particulate filter media, the particulate filter media can be dispersed in the first sub-cavity, the second sub-cavity, and the third sub-cavity, increasing the distance between the particulate filter media. This allows for better backwashing and removal of impurities between the particulate filter media and those attached to them, improving the backwashing effect and extending the service life of the particulate filter media. Along the flow direction of the liquid to be filtered, the cross-sectional area of ​​the first sub-cavity gradually increases, and the backwash liquid carries the particulate filter media towards the inner wall of the first sub-cavity, further dispersing the particulate filter media and increasing the distance between them, thus improving the backwashing effect. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained as provided without creative effort.

[0017] Figure 1 This is a schematic diagram of a cylindrical filter device.

[0018] Figures 2 to 3 This is a schematic diagram of the structure of a filtering device according to an embodiment of this application.

[0019] Figure 4 This is a schematic diagram of an optional hardware structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] As can be seen from the background technology, existing filtration devices suffer from reduced lifespan and backwashing efficiency due to particulate filter media. The reasons are analyzed below.

[0022] refer to Figure 1 This is a schematic diagram of a cylindrical filter device.

[0023] The cylindrical filtration device includes a filtration chamber 100 and a particulate filter medium 101 located in the filtration chamber 100. The particulate filter medium 101 is activated carbon particles and is used to filter the liquid to be filtered.

[0024] The filter chamber 100 is cylindrical in shape, and the particulate filter medium is placed inside the cylinder. This presents the following problem: First, the service life of the entire particulate filter medium 101 within the filter chamber 100 is reduced.

[0025] The flow rate of the liquid to be filtered is unevenly distributed across the cross-section of the cylinder. Most of the liquid to be filtered flows through the path of least resistance (usually the central region Q2 of the cylinder), resulting in the particulate filter media in other regions Q2 not being fully utilized. That is, the particulate filter media 101 in the central region Q1 undertakes the main filtration task, and the impurities accumulate rapidly. The particulate filter media 101 in the central region Q1 becomes saturated prematurely, which reduces the overall service life of the particulate filter media 101 in the filter chamber 100.

[0026] It should be noted that the filter chamber 100 is cylindrical in shape. The flow rate of the liquid to be filtered in the central region Q1 of the cylinder is greater than that in other regions Q2 of the cylinder. That is, along the radial direction of the cylinder, from the central region Q1 to the other regions Q2 of the cylinder, the flow rate of the liquid to be filtered is unevenly distributed. Along the radial direction of the cylinder, the flow rate of the liquid to be filtered gradually decreases.

[0027] Second, it reduces the backwashing effect on the particulate filter media 101.

[0028] (1) The particulate filter medium 101 in the central area Q1 of the cylinder undertakes the main filtration task. Impurities accumulate quickly, which increases the difficulty of backwashing the particulate filter medium 101 and thus reduces the backwashing effect of the particulate filter medium 101.

[0029] (2) During backwashing, the flow rate of the backwash liquid in other areas Q1 of the cylinder is low, which reduces the backwashing effect on the particulate filter media 101 in other areas Q1.

[0030] (3) During backwashing, the particulate filter media 101 is confined within the cylinder, and impurities between the particulate filter media 101 and attached to the particulate filter media 101 cannot be effectively backwashed and removed, thereby reducing the backwashing effect and service life of the particulate filter media 101.

[0031] In summary, existing filtration devices suffer from reduced lifespan and backwashing efficiency due to the use of particulate filter media.

[0032] This invention provides a filtration device for extending the service life of particulate filter media and improving backwashing efficiency. The device includes: a receiving cavity for accommodating the particulate filter media, the receiving cavity comprising a first sub-receiving cavity, a second sub-receiving cavity, and a third sub-receiving cavity connected sequentially along the flow direction of the liquid to be filtered; the bottom of the first sub-receiving cavity is connected to the top of the second sub-receiving cavity, and the bottom of the second sub-receiving cavity is connected to the top of the third sub-receiving cavity; wherein, along the flow direction of the liquid to be filtered, the cross-sectional area of ​​the first sub-receiving cavity gradually decreases, the cross-sectional area of ​​the second sub-receiving cavity remains constant, and the cross-sectional area of ​​the third sub-receiving cavity gradually increases; the top of the first sub-receiving cavity is provided with a liquid inlet; an arched filter screen, comprising: a first mesh body arched towards the liquid inlet; and a support portion, one end of which is connected to the outer periphery of the first mesh body and is sealed to the inner wall of the second sub-receiving cavity.

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0034] refer to Figures 2 to 3 This is a schematic diagram of the structure of a filtering device according to an embodiment of this application; wherein, Figure 3 This is a schematic diagram of the structure of an arched filter screen according to an embodiment of this application.

[0035] In this embodiment, the filtration device is used to extend the service life of the particulate filter media 200 and improve the backwashing effect.

[0036] The granular filter medium 200 includes one or more of the following: resin particles, montmorillonite particles, ion exchange fiber particles, and activated carbon particles. In this embodiment, the granular filter medium 200 is resin particles; all the resin particles have the same shape and size. In a specific embodiment, the resin particles are all spherical ion exchange resins with a particle size range selected from [0.45 mm, 0.55 mm], which is not intended to limit this application.

[0037] refer to Figure 2 The filtration device includes: a receiving cavity for containing particulate filter media 200, the receiving cavity including a first sub-receiving cavity 202, a second sub-receiving cavity 204 and a third sub-receiving cavity 206 connected in sequence along the flow direction F1 of the liquid to be filtered, the bottom of the first sub-receiving cavity 202 being connected to the top of the second sub-receiving cavity 204 being connected to the bottom of the second sub-receiving cavity 204 being connected to the top of the third sub-receiving cavity 206; along the flow direction F1 of the liquid to be filtered, the cross-sectional area of ​​the first sub-receiving cavity 202 gradually decreases, the cross-sectional area of ​​the second sub-receiving cavity 204 is constant, and the cross-sectional area of ​​the third sub-receiving cavity 206 gradually increases.

[0038] In one specific embodiment, the liquid to be filtered flows vertically into the third sub-receiving cavity 206.

[0039] The first sub-receiving cavity 202 is used to contain the liquid to be filtered and also to contain part or all of the particulate filter media 200 during backwashing of the filtration device. That is, during backwashing, the particulate filter media 200 are dispersed in the first sub-receiving cavity 202, the second sub-receiving cavity 204 and the third sub-receiving cavity 206, which increases the distance between each particulate filter media 200, thereby removing foreign matter mixed between adjacent particulate filter media 200 and impurities attached to the inside or surface of particulate filter media 200, extending the service life of particulate filter media 200 and improving the backwashing effect.

[0040] By controlling the flow rate of the backwash liquid, the particulate filter medium 200 is dispersed in the first sub-receptacle 202, the second sub-receptacle 204, and the third sub-receptacle 206.

[0041] The second sub-receiving cavity 204 is used to install the arched filter screen 212, and the third sub-receiving cavity 206 is used to contain the particulate filter medium 200.

[0042] For other beneficial effects of the second sub-receiving cavity 204 and the third sub-receiving cavity 206, please refer to the description in the first sub-receiving cavity 202 above.

[0043] The backwashing includes an expansion stage and a spray cleaning stage for the particulate filter media 200.

[0044] During the expansion phase of the particulate filter medium 200, the backwash liquid (or cleaning liquid) enters from the lower large end and flows out from the upper small end of the third sub-receiving cavity 206, so that the expansion rate of the particulate filter medium 200 reaches the preset expansion rate (to meet the filtration requirements of the liquid to be filtered).

[0045] During the spray cleaning stage, the backwash liquid flows through the particulate filter media 200 in the opposite direction to the flow direction F1 of the liquid to be filtered, in order to remove foreign matter trapped between adjacent particulate filter media 200, as well as impurities attached to the inside or surface of the particulate filter media 200, and restore its filtration capacity as a regeneration operation.

[0046] When the filter device is backwashed, the gravity of the particulate filter medium 200 is greater than the gravity of the foreign object, making it easier for the foreign object to peel off from the particulate filter medium 200.

[0047] The backwashing also cleans the first sub-receiving cavity 202, the second sub-receiving cavity 204, and the third sub-receiving cavity 206, for example, by cleaning foreign matter attached to the inner sidewalls.

[0048] Along the flow direction F1 of the liquid to be filtered, the cross-sectional area of ​​the third sub-receptacle 206 gradually increases. That is, along the flow direction F1 of the liquid to be filtered, the cross-sectional area enclosed by the inner sidewall of the third sub-receptacle 206 gradually increases, or the flow cross-sectional area of ​​the liquid to be filtered gradually increases. The increase in cross-sectional area reduces the overall flow velocity of the liquid to be filtered, and at the same time, the radial velocity distribution of the liquid to be filtered tends to be uniform, so that all the particulate filter media 200 participate in filtration simultaneously. The particulate filter media 200 are saturated simultaneously, the utilization rate is improved, and thus the service life of the particulate filter media 200 is extended. Moreover, the reduction in the overall flow velocity of the liquid to be filtered in the third sub-receptacle 206 can increase the interaction between the liquid to be filtered and the particulate filter media 200. The contact time is increased, improving the filtration effect; and, during backwashing of the particulate filter media 200 (spray cleaning stage), the backwash liquid used for backwashing flows from the bottom (large end) of the third sub-receiving cavity 206 to the top (small end) of the third sub-receiving cavity 206, which can increase the flow rate of the backwash liquid, thereby increasing the speed at which the particulate filter media 200 flows into the first sub-receiving cavity 202, reducing the risk of the particulate filter media 200 agglomerating, so that the particulate filter media 200 sprayed into the first sub-receiving cavity 202 can be better dispersed, making it easier to remove foreign matter between the particulate filter media 200 and impurities attached to the inside or surface of the particulate filter media 200, thus extending the service life of the particulate filter media 200.

[0049] Along the flow direction F1 of the liquid to be filtered, the cross-sectional area of ​​the second sub-receiving cavity 204 is constant. That is, along the flow direction F1 of the liquid to be filtered, the cross-sectional area enclosed by the inner sidewall of the second sub-receiving cavity 204 is constant, or the flow cross-sectional area of ​​the liquid to be filtered is constant. This is used to stabilize the flow velocity of the liquid to be filtered flowing out of the first sub-receiving cavity 202 before it flows to the third sub-receiving cavity 206, that is, to stabilize the flow velocity of the liquid to be filtered. This provides a basis for making the radial velocity distribution of the liquid to be filtered flowing through the third sub-receiving cavity 206 tend to be uniform.

[0050] Along the flow direction F1 of the liquid to be filtered, the cross-sectional area of ​​the first sub-receptacle 202 gradually decreases. That is, along the flow direction F1 of the liquid to be filtered, the cross-sectional area enclosed by the inner sidewall of the first sub-receptacle 202 gradually decreases, or the flow cross-sectional area of ​​the liquid to be filtered gradually decreases. This is used to accelerate the flow velocity of the liquid to be filtered in the first sub-receptacle 202 to compensate for the reduced flow velocity of the liquid to be filtered as it flows through the third sub-receptacle 206. Furthermore, during backwashing of the particulate filter media 200 (spray cleaning stage), the backwash liquid flowing from the third sub-receptacle 206 to the first sub-receptacle 202 increases in radial velocity along the first sub-receptacle 202. This allows the particulate filter media 200 flowing into the first sub-receiving cavity 202 to disperse, and the backwash liquid flowing from the third sub-receiving cavity 206 to the first sub-receiving cavity 202 to have a reduced velocity along the axial direction of the first sub-receiving cavity 202. This reduces the impact force of the particulate filter media 200 on the arched filter screen, thereby reducing the probability of the particulate filter media 200 breaking and extending its service life. Furthermore, the reduced velocity of the backwash liquid flowing from the third sub-receiving cavity 206 to the first sub-receiving cavity 202 along the axial direction of the first sub-receiving cavity 202 reduces the risk of the particulate filter media 200 clogging the arched filter screen.

[0051] The particulate filter medium 200 is dispersed in the first sub-receiving cavity 202, the second sub-receiving cavity 204 and the third sub-receiving cavity 206, which can better clean the inner walls of the first sub-receiving cavity 202, the second sub-receiving cavity 204 and the third sub-receiving cavity 206, and further improve the backwashing effect.

[0052] Continue to refer to Figure 2 The top of the first sub-receiving cavity 202 is provided with a liquid inlet 210, through which the liquid to be filtered flows into the first sub-receiving cavity 202.

[0053] The shape of the liquid inlet 210 includes one or more of the following: a cylinder with openings at both ends, an elliptical cylinder with openings at both ends, a square cylinder with openings at both ends, a rectangular cylinder with openings at both ends, and a polygonal cylinder with openings at both ends. In this embodiment, the shape of the liquid inlet 210 is a cylinder with openings at both ends.

[0054] In this embodiment, the shape formed by the inner sidewall of the liquid inlet 210 is the same as the shape formed by the inner sidewall of the second sub-accommodating cavity 204, and the dimensions (length, width, height, upper base diameter, lower base diameter) of the shape formed by the inner sidewall of the liquid inlet 210 are equal to the dimensions of the shape formed by the inner sidewall of the second sub-accommodating cavity 204; the inner sidewall of the liquid inlet 210 and the inner sidewall of the second sub-accommodating cavity 204 are flush with each other along the flow direction F1 of the liquid to be filtered.

[0055] It should be noted that, along the flow direction F1 perpendicular to the filtrate to be tested, the cross-sectional shape of the cylindrical tube open at both ends is a circular ring, the cross-sectional shape of the elliptical tube open at both ends is an elliptical ring, the cross-sectional shape of the square tube open at both ends is a square ring, the cross-sectional shape of the rectangular tube open at both ends is a rectangular ring, and the cross-sectional shape of the polygonal tube open at both ends is a polygonal ring.

[0056] Continue to refer to Figure 2 The first sub-receiving cavity 202 is an upper frustum that is larger at the top (larger end) and smaller at the bottom (smaller end), that is, the first sub-receiving cavity 202 is a frustum that is larger at the top and smaller at the bottom; the second sub-receiving cavity 204 is a cylinder with openings at both ends; the third sub-receiving cavity 206 is a lower frustum that is smaller at the top (smaller end) and larger at the bottom (larger end), that is, the third sub-receiving cavity 206 is a frustum that is smaller at the top and larger at the bottom.

[0057] It should be noted that, for the sake of brevity and clarity, Figure 2 The spatial outlines of the first sub-receiving cavity 202, the second sub-receiving cavity 204, the third sub-receiving cavity 206, and the liquid inlet 210 are shown only by line segments and are not intended to limit this application.

[0058] In this embodiment, the inner wall of the upper truncated cone forms a first sub-receiving cavity 202, the inner wall of the cylinder with openings at both ends forms a second sub-receiving cavity 204, and the inner wall of the lower truncated cone forms a third sub-receiving cavity 206.

[0059] In this embodiment, the small end of the upper frustum is connected through to the top of the cylinder with openings at both ends, and the bottom of the cylinder with openings at both ends is connected through to the small end of the lower frustum.

[0060] In this embodiment, the small end of the upper truncated cone, the top of the cylinder with open ends, the bottom of the cylinder with open ends, and the top of the lower truncated cone all have the same cross-sectional shape and size formed by their inner sidewalls.

[0061] In this embodiment, the first sub-receiving cavity 202, the second sub-receiving cavity 204, and the third sub-receiving cavity 206 are integrally formed. In other embodiments, the first sub-receiving cavity 202, the second sub-receiving cavity 204, and the third sub-receiving cavity 206 are independently formed and assembled to form a receiving cavity.

[0062] In this embodiment, the first sub-accommodating cavity 202 is a frustum-shaped cavity with a larger upper end and a smaller lower end, with an inner diameter (diameter) of 1.5D at the larger end, an inner diameter (diameter) of D at the smaller end, and a semi-cone angle of 3° to 7°; the second sub-accommodating cavity 204 is a cylindrical cavity with an inner diameter (diameter) of D, and a height H, wherein the height H is 2 to 5 times the inner diameter D of the cylinder, preferably 3 to 4 times; the third sub-accommodating cavity 206 is a frustum-shaped cavity with a smaller upper end and a larger lower end, with an inner diameter (diameter) of D at the smaller end, an inner diameter (diameter) of 1.5D at the larger end, and a semi-cone angle of 3° to 7°.

[0063] It should be noted that the height H of the second sub-receptacle is 2 to 5 times the inner diameter D of the cylinder, which better achieves a more uniform radial flow velocity distribution of the liquid to be filtered flowing through the third sub-receptacle 206.

[0064] The semi-cone angle refers to the angle between the side wall of the frustum and the axis of the frustum. The value A is equal to (inner diameter of the large end of the frustum - inner diameter of the small end of the frustum) / (twice the height of the frustum). The semi-cone angle is equal to arctan(A).

[0065] The filtration device includes: an arched filter screen 212.

[0066] refer to Figure 3 , combined Figure 2 The arched filter screen 212 is used to confine the particulate filter medium 200 within the third sub-receiving cavity 206 when filtering the liquid to be filtered; it is also used to perform initial filtration of the liquid to be filtered within the first sub-receiving cavity 202; and it is also used to confine the particulate filter medium 200 within the first sub-receiving cavity 202, the second sub-receiving cavity 204, and the first sub-receiving cavity 202 when backwashing the filter device.

[0067] Continue to refer to Figure 3 , combined Figure 2 The arched filter screen 212 includes: a first mesh body 214, which arches towards the liquid inlet 210 to increase the contact area between the first mesh body 214 and the liquid to be filtered, thereby improving the filtration efficiency.

[0068] In this embodiment, the axis F2 of the first mesh body 214 coincides with the axis of the first sub-accommodating cavity 202. That is, the axis F2 of the first mesh body 214 coincides with the axis of the upper truncated cone, the axis of the lower truncated cone, the axis of the cylinder with openings at both ends, and the axis of the liquid inlet.

[0069] The arched filter screen 212 further includes a second mesh body 216, the cross section of which along the flow direction F1 perpendicular to the liquid to be filtered is parallel to the plane containing the bottom of the second sub-accommodating cavity 204.

[0070] The second mesh 216 is used to confine the particulate filter medium 200 within the third sub-receptacle 206.

[0071] The cross section of the second mesh 216 along the flow direction F1 perpendicular to the liquid to be filtered is parallel to the plane where the bottom of the second sub-receiving cavity 204 is located, so that the flow rate of the liquid to be filtered flowing out of the second sub-receiving cavity 204 is uniform.

[0072] The arched filter screen 212 also includes a support portion 218.

[0073] The support portion 218 is used to provide strength support for the first mesh body 214 and the second mesh body 216, so as to reduce the risk of deformation caused by the weight and impact force of the liquid to be filtered during filtration.

[0074] The shape of the support part 218 includes one or more of the following: a support cylinder with openings at both ends, a support elliptical cylinder with openings at both ends, a support square cylinder with openings at both ends, a support rectangular cylinder with openings at both ends, and a support polygonal cylinder with openings at both ends. In this embodiment, the shape of the support part 218 is a support cylinder with openings at both ends.

[0075] It should be noted that, along the flow direction F1 perpendicular to the filtrate to be tested, the cross-sectional shape of the supporting cylindrical tube open at both ends is a circular ring, the cross-sectional shape of the supporting elliptical tube open at both ends is an elliptical ring, the cross-sectional shape of the supporting square tube open at both ends is a square ring, the cross-sectional shape of the supporting rectangular tube open at both ends is a rectangular ring, and the cross-sectional shape of the supporting polygonal tube open at both ends is a polygonal ring.

[0076] In this embodiment, the material of the support portion 218 is stainless steel.

[0077] One end of the support portion 218 is connected to the outer periphery of the first mesh body 214, and the other end of the support portion 218 is connected to the outer periphery of the second mesh body 216. In this embodiment, the top end face of the open-ended support cylinder is fixedly connected to the outer periphery of the first mesh body 214 by welding or bonding, and the bottom end face of the open-ended support cylinder is fixedly connected to the outer periphery of the second mesh body 216 by welding or bonding. The welding is argon arc welding or laser welding, and the bonding is epoxy resin adhesive.

[0078] The top end face of one end of the support portion 218 and the bottom of the first sub-receiving cavity 202 are located in a first plane, and the bottom end face of the other end of the support portion 218 and the bottom of the second sub-receiving cavity 204 are located in a second plane; in this embodiment, the top end face of the support cylinder with openings at both ends and the bottom of the first sub-receiving cavity 202 are located in a first plane, and the bottom end face of the support cylinder with openings at both ends and the bottom of the second sub-receiving cavity 204 are located in a second plane.

[0079] The bottom end face of the support cylinder with openings at both ends is located in a second plane with the bottom of the second sub-receiving cavity 204, so as to confine the particulate filter medium 200 in the third sub-receiving cavity 206 and restrict the movement of the particulate filter medium 200 in the third sub-receiving cavity 206.

[0080] The arched filter screen 212 also includes a sealing rubber ring (not shown) that wraps around the outer wall of the support portion 218, for sealing the support portion 218 with the inner wall of the second sub-receiving cavity 204, so that the liquid to be filtered flows from the second sub-receiving cavity 204 to the third sub-receiving cavity 206.

[0081] In this embodiment, the sealing rubber ring wraps around the outer wall of the support portion 218. In some embodiments, the sealing rubber ring covers the inner wall of the second sub-receiving cavity 204.

[0082] In one specific embodiment, the first mesh 214 is a woven mesh or sintered mesh made of metal or polymer material, and the design specifications of the first mesh 214 include at least the following parameters: The material of the woven mesh of the first mesh body 214 is stainless steel; the mesh size of the first mesh body 214 is selected from [1 mm, 2 mm]; the mesh count of the first mesh body 214 is selected from [10, 20] (according to GB / T5330 or ASTME11 standard); the wire diameter of the woven mesh of the first mesh body 214 is selected from [30 micrometers, 60 micrometers]; the opening ratio of the woven mesh of the first mesh body 214 is selected from [35%, 50%]; the height of the first sub-accommodating cavity 202 is h, and the arch height of the first mesh body 214 is selected from [0.25h, 0.5h].

[0083] It should be noted that the material of the woven mesh of the first mesh body 214 is such that the deformation of the first mesh body 214 caused by the torsion of the liquid to be filtered by gravity and impact during filtration is within a preset error range, that is, the deformation of the first mesh body 214 can be ignored.

[0084] In one specific embodiment, the second mesh 216 is a woven mesh or sintered mesh made of metal or polymer material, and the design specifications of the second mesh 216 include at least the following parameters: The woven mesh of the second mesh body 216 is made of stainless steel; the mesh size of the second mesh body 216 is selected from [0.15 mm, 0.25 mm]; the mesh count of the second mesh body 216 is selected from [60, 100] (according to GB / T5330 or ASTM E11 standards); the wire diameter of the woven mesh of the second mesh body 216 is selected from [90 micrometers, 140 micrometers]; the opening rate of the woven mesh of the second mesh body 216 is selected from [30%, 45%].

[0085] It should be noted that the material of the woven mesh of the second mesh body 216 is such that the deformation caused by the twisting of the liquid to be filtered during filtration is within a preset error range, that is, the deformation of the second mesh body 216 can be ignored.

[0086] In some embodiments, the first mesh body 214, the second mesh body 216, and the support portion 218 are integrally formed.

[0087] The axes of the first mesh body 214, the support part 218 and the second mesh body 216 coincide, and the coinciding axis is F2.

[0088] It should be noted that, for the sake of brevity and clarity, Figure 2 and Figure 3 The specific structures of the first and second meshes are not shown in the text, and the structures of the first and second meshes are designed according to the size of the particulate filter medium 200, which does not limit this application.

[0089] Continue to refer to Figure 2 The bottom of the third sub-receiving cavity 206 is provided with a bottom filter screen (not shown) for supporting the particulate filter medium 200, which provides support for the particulate filter medium 200.

[0090] In this embodiment, the cross-section of the bottom filter screen along the flow direction F1 perpendicular to the liquid to be filtered is parallel to the plane where the bottom of the third sub-accommodating cavity 206 is located.

[0091] In this embodiment, the structural design of the bottom filter can refer to the design of the second mesh 216.

[0092] In this embodiment, the first mesh body 214, the second mesh body 216 and the bottom filter are all rigid filter screens, which can maintain their shape during the filtration process of the filter screen to be filtered and the backwashing step.

[0093] In this embodiment, the height of the support portion 218 along its axial direction is equal to the height of the second sub-accommodating cavity 204 along its axial direction, but this does not limit the present application.

[0094] Continue to refer to Figure 2 The filtering device includes a connecting rod 220 and a motor 222.

[0095] The motor 222 drives the connecting rod 220, which in turn drives the arched filter screen 212 to move away from and towards the inlet 210 along the flow direction F1 of the liquid to be filtered.

[0096] The shape of the connecting rod 220 includes one or more of the following: cylindrical, elliptical, square, and polygonal. In this embodiment, the connecting rod 220 is cylindrical. Figure 2 As shown, the connecting rod 220 is illustrated with line segments, but this is not intended to limit the scope of this application; the size and shape of the connecting rod 220 are designed so as not to affect filtration and backwashing.

[0097] One end of the connecting rod 220 is detachably and fixedly connected to the arched filter screen 212. In this embodiment, one end of the connecting rod 220 is detachably and fixedly connected to the arched filter screen 212 by a screw and nut. The axis of the connecting rod 220 coincides with the axis F2 of the arched filter screen 212. The nut is located at the highest point of the top of the arched filter screen 212. One end of the connecting rod 220 is screw-shaped.

[0098] The other end of the connecting rod 220 is connected to the motor 222. The motor 222 drives the arched filter screen 212 to move forward and backward along the axis F2 of the receiving cavity. In this embodiment, the other end of the connecting rod 220 is detachably fixed to the motor 222 by screws, nuts or bolts. Before filtering the liquid to be filtered, the motor 222 drives the connecting rod 220 to move downward (forward) along the flow direction F1 of the liquid to be filtered, so that the support part 218 of the arched filter screen 212 is sealed to the inner wall of the second sub-receiving cavity 204, and the bottom end face of the other end of the support part 218 is sealed to the second sub-receiving cavity 204. The bottom of the cavity 204 is located in the same plane, that is, in the same second plane. Before backwashing the particulate filter medium 200, the motor 222 drives the connecting rod 220 to move (reverse) in the opposite direction of the flow direction F1 of the liquid to be filtered, and moves into the inlet 210. The support 218 is sealed to the inner wall of the inlet 210. When cleaning the arched filter screen 212, the motor 222 drives the arched filter screen 212 to move through the inlet 210 to the outside of the inlet 210, so that the connecting rod 220 can be disassembled from the arched filter screen 212 for cleaning.

[0099] The motor 222 includes a servo motor or a stepper motor. For the working principle and structure of the motor 222, please refer to the relevant description in the published literature. The motor 222 is sufficient to drive the arched filter screen 212 to move forward and backward along the axis F2 of the receiving cavity.

[0100] Continue to refer to Figure 2 The filtering device includes a fourth sub-receiving cavity 208, the top of which is connected through to the bottom of the third sub-receiving cavity 206.

[0101] The fourth sub-receptacle 208 is used to contain the liquid to be filtered after being filtered by the particulate filter medium 200, i.e., the filtered pure liquid.

[0102] The shape of the fourth sub-receiving cavity 208 includes one or more of the following: a cylinder with openings at both ends, an elliptical cylinder with openings at both ends, a square cylinder with openings at both ends, a rectangular cylinder with openings at both ends, and a polygonal cylinder with openings at both ends. In this embodiment, the shape of the fourth sub-receiving cavity 208 is a cylinder with openings at both ends.

[0103] The fourth sub-receiving cavity 208 also includes a liquid outlet 224 located at the bottom of the fourth sub-receiving cavity 208.

[0104] Continue to refer to Figure 2 The filtration device includes a pH meter 226.

[0105] The pH meter 226 is used to test the acidity or alkalinity of the filtered pure liquid.

[0106] In this embodiment, the pH tester 226 is located on the inner wall of the fourth sub-accommodation cavity 208.

[0107] In this embodiment, the pH meter 226 mainly consists of two parts: a pH composite sensor and a transmitter. The pH composite sensor includes: a sensitive glass bulb for sensing the hydrogen ion concentration in water and generating a potential signal; an internal reference electrode and an external reference electrode for providing a stable reference potential; and a liquid junction for connecting the measurement circuit. The transmitter is electrically connected to the pH composite sensor and is used to receive the potential signal and convert it into a pH value output.

[0108] The position of the pH meter 226 can be set according to actual needs. In some embodiments, the pH meter 226 is located in the filtered pure liquid.

[0109] For detailed information on the structure and testing principle of the pH meter 226, please refer to the existing publicly available literature.

[0110] Continue to refer to Figure 3The filtration device includes: a first residual chlorine tester 228 and a second residual chlorine tester 230.

[0111] The first residual chlorine tester 228 and the second residual chlorine tester 230 are used together to obtain the dynamic adsorption rate of residual chlorine.

[0112] In this embodiment, the first residual chlorine tester 228 is located on the inner wall of the first sub-receiving cavity 202, and the second residual chlorine tester 230 is located on the inner wall of the fourth sub-receiving cavity 208. In some embodiments, the first residual chlorine tester 228 is suspended in the liquid to be filtered in the first sub-receiving cavity 202, and the second residual chlorine tester 230 is suspended in the filtered pure liquid in the fourth sub-receiving cavity 208. The positions of the first residual chlorine tester 228 and the second residual chlorine tester 230 can be set according to actual needs.

[0113] In this embodiment, the first residual chlorine tester 228 mainly consists of a residual chlorine sensor and a transmitter. The residual chlorine sensor includes a working electrode (gold or platinum electrode), a counter electrode (platinum electrode), and a reference electrode (Ag / AgCl electrode). These three electrodes are immersed in the liquid to be filtered. Under the condition of applying a constant potential, the residual chlorine in the water undergoes an electrochemical reaction on the surface of the working electrode, generating a current signal proportional to the residual chlorine concentration. The transmitter is electrically connected to the residual chlorine sensor and is used to receive the current signal and convert it into a first residual chlorine concentration value for output.

[0114] In this embodiment, the second residual chlorine tester 230 mainly consists of a residual chlorine sensor and a transmitter. The residual chlorine sensor includes a working electrode (gold or platinum electrode), a counter electrode (platinum electrode), and a reference electrode (Ag / AgCl electrode). These three electrodes are immersed in the filtered pure liquid. Under the condition of applying a constant potential, the residual chlorine in the water undergoes an electrochemical reaction on the surface of the working electrode, generating a current signal proportional to the residual chlorine concentration. The transmitter is electrically connected to the residual chlorine sensor and is used to receive the current signal and convert it into a second residual chlorine concentration value for output.

[0115] The dynamic adsorption rate of residual chlorine is obtained by the ratio of the second residual chlorine concentration to the first residual chlorine concentration. Based on the obtained dynamic adsorption rate of residual chlorine, it is determined whether the particulate filter medium 200 needs to be backwashed.

[0116] In this embodiment, the liquid to be filtered is water containing impurities (such as macromolecular organic matter, iron oxides, and residual chlorine), and the filtered pure liquid is pure water with impurities removed.

[0117] For detailed information on the structure and testing principles of the first residual chlorine tester 228 and the second residual chlorine tester 230, please refer to the existing publicly available literature.

[0118] Continue to refer to Figure 2 The filtration device includes: a turbidimeter 232.

[0119] The turbidimeter 232 is used to test the turbidity (turbidity) of the filtered pure liquid.

[0120] In this embodiment, the turbidimeter 232 is located on the outer wall of the fourth sub-receiving cavity 208. The position of the turbidimeter 232 can be set according to actual needs.

[0121] In this embodiment, the fourth sub-receptor cavity 208 is made of a transparent material; in other embodiments, the turbidimeter 232 corresponding to the fourth sub-receptor cavity 208 is made of a transparent material.

[0122] In this embodiment, the turbidimeter 232 mainly consists of four parts: a light source system, a sample cell, a photodetector, and a signal processing unit. The light source system typically uses a tungsten lamp or LED to emit a stable light beam, illuminating the filtered pure liquid within the fourth sub-receptor cavity 208. Suspended particles in the filtered pure liquid scatter the incident light. The photodetector (generally a photodiode or photomultiplier tube) detects the intensity of the scattered light at a 90° angle to the incident light. This intensity is proportional to the turbidity of the filtered pure liquid. The signal processing unit converts the detected light signal into a turbidity value. The unit of turbidity is NTU.

[0123] For detailed information on the structure of the turbidimeter 232 and the calculation method for turbidity testing, please refer to the existing publicly available literature.

[0124] Continue to refer to Figure 2 The filtration device includes: a multi-layer pressure sensor arranged in the third sub-receptacle 206 along the flow direction F1 of the liquid to be filtered.

[0125] The multilayer pressure sensor is used to detect the increase in interlayer pressure difference, that is, to detect the real-time pressure at different positions within the third sub-accommodation cavity 206.

[0126] The pressure sensor includes one or more of the following: a miniature diaphragm gauge pressure sensor with a porous sintered metal protective cover, a capillary pressure sensor, and a fiber optic grating pressure sensor. In this embodiment, the pressure sensor is a miniature diaphragm gauge pressure sensor with a porous sintered metal protective cover.

[0127] The multilayer micro diaphragm pressure sensor is embedded in the particulate filter medium 200 at intervals not greater than a preset interval along the flow direction F1 of the liquid to be filtered. The pressure-sensing diaphragm of the micro diaphragm pressure sensor faces the flow direction F1 of the liquid to be filtered, and the pressure-sensing diaphragm is covered with a porous sintered metal protective cap. The micro diaphragm pressure sensor detects the fluid pressure of the liquid to be filtered at the corresponding depth in real time (real-time fluid pressure). The processor calculates the interlayer pressure difference increase corresponding to each micro diaphragm pressure sensor based on the real-time fluid pressure and the initial fluid pressure. When the interlayer pressure difference increase of any one layer exceeds the preset pressure difference increase, it is determined that the particulate filter medium 200 in that area is blocked, and the particulate filter medium 200 needs to be backwashed.

[0128] In this embodiment, there are four multilayer micro diaphragm pressure sensors, namely micro diaphragm pressure sensor 234, micro diaphragm pressure sensor 236, micro diaphragm pressure sensor 238, and micro diaphragm pressure sensor 240.

[0129] In one specific embodiment, during the initial filtration stage of the liquid to be filtered, the initial fluid pressure P0 measured by the micro diaphragm pressure sensors 234, 236, 238, and 240 is all equal. As the time for filtering the liquid to be filtered increases, the real-time flow rate measured by the micro diaphragm pressure sensors 234, 236, 238, and 240 increases. The pressures are respectively pressure P1, pressure P2, pressure P3, and pressure P4. The interlayer pressure difference increase Z1 corresponding to the micro diaphragm pressure sensor 234 is (P1-P0) / P0, the interlayer pressure difference increase Z2 corresponding to the micro diaphragm pressure sensor 236 is (P2-P0) / P0, the interlayer pressure difference increase Z3 corresponding to the micro diaphragm pressure sensor 238 is (P3-P0) / P0, and the interlayer pressure difference increase Z4 corresponding to the micro diaphragm pressure sensor 240 is (P4-P0) / P0. If any one of the interlayer pressure difference increase Z1, Z2, Z3, or Z4 exceeds the preset pressure difference increase, it is determined that the particulate filter media 200 in that area is clogged, and the particulate filter media 200 needs to be backwashed.

[0130] For detailed information on the structure and testing principle of the aforementioned miniature diaphragm pressure sensor, please refer to the existing publicly available literature.

[0131] In this embodiment, the axes of the first sub-accommodating cavity 202, the second sub-accommodating cavity 204, the third sub-accommodating cavity 206, the fourth sub-accommodating cavity 208, the arched filter screen 212, and the liquid inlet 210 coincide with the axis of the connecting rod 220, and the liquid to be filtered is water containing impurities.

[0132] In this embodiment, the pH tester 226, the first residual chlorine tester 228, and the second residual chlorine tester 230 are detachably fixed to the inner wall of the containment cavity layer; the turbidimeter 232 is detachably fixed to the outer wall of the containment cavity layer.

[0133] To better understand this application, embodiments of this application provide a filtration method for the liquid to be filtered, applied to the filtration device. The following, in conjunction with... Figure 2 and Figure 3 Please provide an explanation.

[0134] In this embodiment, the filtering method includes: Step S500: The motor 222 drives the connecting arched filter screen 212 to move downward along the axial direction of the first sub-accommodating cavity 202 into the second sub-accommodating cavity 204 via the connecting rod 220, so that the arched filter screen 212 is sealed to the inner wall of the second sub-accommodating cavity 204, and the top end face of one end of the support part 218 is in the same plane (in the first plane) as the bottom of the first sub-accommodating cavity 202, and the bottom end face of the other end of the support part 218 is in the same plane (in the second plane) as the bottom of the second sub-accommodating cavity 204.

[0135] Step S501: The liquid to be filtered flows into the first sub-receiving cavity 202 through the inlet 210, undergoes preliminary filtration through the first mesh 214 and the second mesh 216 of the arched filter screen 212, and then flows into the third sub-receiving cavity 206; the particulate filter medium 200 in the third sub-receiving cavity 206 continues to filter the liquid to be filtered; after filtration by the particulate filter medium 200, a filtered pure liquid is obtained, which flows into the fourth sub-receiving cavity 208.

[0136] During the filtration of the filtrate, the following steps are performed simultaneously: The pH meter 226 measures the acidity or alkalinity of the filtered pure liquid in real time. If the acidity or alkalinity exceeds the preset pH threshold, the filtration device stops filtration and backwashes the filtration device.

[0137] The first residual chlorine tester 228 measures the first chlorine content in the first sub-containment chamber 202 in real time, and the second residual chlorine tester 230 measures the second chlorine content in the fourth sub-containment chamber 208 in real time. The processor calculates the chlorine content ratio of the second content to the first content in real time. If the chlorine content ratio exceeds a preset chlorine content threshold, the filtration device stops filtration to backwash the filtration device.

[0138] The multi-layer pressure sensor measures the pressure value at the corresponding depth in real time and calculates the interlayer pressure difference increase in real time. If at least one of the multiple interlayer pressure difference increases exceeds the preset pressure difference increase threshold, the filtration device stops filtration to backwash the filtration device.

[0139] The turbidimeter 232 measures the turbidity of the filtered pure liquid in the fourth sub-containment chamber 208 in real time. If the turbidity exceeds the turbidity threshold, the filtration device stops filtration to backwash the filtration device.

[0140] It should be noted that if any of the pH, chlorine content ratio, interlayer pressure difference increase, or turbidity exceeds its corresponding threshold, the filtration device will stop filtration (i.e., stop inputting the liquid to be filtered into the filtration device).

[0141] After replacing the particulate filter medium 200, the liquid to be filtered is filtered again according to the above steps.

[0142] To better understand this application, embodiments of this application provide a backwashing method for the particulate filter medium, applied to the filtration device.

[0143] The backwashing includes an expansion stage and a spray cleaning stage for the particulate filter media 200.

[0144] In this embodiment, the expansion stage includes: Step S600: Soak the particulate filter medium 200 until its expansion rate reaches the preset expansion rate.

[0145] In this embodiment, the arched filter screen 212 is moved outside the liquid inlet 210 by the motor 222; the granular filter medium 200 is loaded into the third sub-accommodation cavity 206. The arched filter screen 212 is moved into the second sub-accommodating cavity 204 by the motor 222, and the arched filter screen 212 is sealed to the inner wall of the second sub-accommodating cavity 204.

[0146] The backwash solution enters from the lower large end and flows out from the upper small end of the third sub-receiving cavity 206, immersing the particulate filter medium 200 to achieve a preset expansion rate.

[0147] When the pH exceeds a preset pH threshold, or the chlorine content ratio exceeds a preset chlorine content threshold, or at least one of the interlayer pressure difference increases exceeds a preset pressure difference increase threshold, or the turbidity exceeds a turbidity threshold, the particulate filter media 200 is backwashed (spray cleaning stage).

[0148] In this embodiment, the spray cleaning stage includes: Step S601: Discharge the remaining liquid to be filtered and the filtered pure liquid from the receiving cavity.

[0149] Stop supplying the liquid to be filtered into the containment cavity from the inlet 210. Using a pump (not shown), the liquid to be filtered in the first sub-containment cavity 202, the second sub-containment cavity 204 and the third sub-containment cavity 206 are pumped out through the outlet 224 at the bottom of the fourth sub-containment cavity 208, as well as the filtered pure liquid in the fourth sub-containment cavity 208.

[0150] Step S602: The motor 222 drives the connecting rod 220, and the connecting rod 220 drives the arched filter screen 212 to move towards the inlet 210 in the opposite direction of the flow direction F1 of the liquid to be filtered, until the arched filter screen 212 moves out of the inlet 210.

[0151] The arched filter screen 212 is rinsed with a high-pressure cleaning fluid (e.g., deionized water) to remove foreign matter adhering to the arched filter screen 212.

[0152] After the arched filter screen 212 is cleaned, the motor 222 drives the arched filter screen 212 to move along the flow direction F1 of the liquid to be filtered until the bottom end face of the support part 218 is flush with the bottom end face of the liquid inlet 210. When backwashing the particulate filter medium 200, the particulate filter medium 200 is confined in the first sub-accommodating cavity 202, the second sub-accommodating cavity 204 and the third sub-accommodating cavity 206.

[0153] Step S603: Backwashing fluid (cleaning fluid) (e.g., deionized water) is introduced through the outlet 224 at the bottom of the fourth sub-receptacle 208, carrying a portion of the particulate filter media 200 in the third sub-receptacle 206 into the second sub-receptacle 204 and the first sub-receptacle 202. This disperses the particulate filter media 200 in the first sub-receptacle 202, the second sub-receptacle 204, and the third sub-receptacle 206, improving the backwashing effect of the particulate filter media 200 and extending its service life.

[0154] In this embodiment, while backwashing the particulate filter medium 200, the inner walls of the third sub-receptacle 206, the second sub-receptacle 204, and the first sub-receptacle 202 are also cleaned. In addition, the pressure sensor, the first residual chlorine tester 228, the second residual chlorine tester 230, the pH tester 226, and the bottom filter screen are also cleaned. Because of the dispersion of the particulate filter medium 200, the backwashing effect is greatly improved.

[0155] Step S603: After backwashing is completed, stop the flow of backwash liquid through the outlet 224 at the bottom of the fourth sub-receptacle 208, and use a pump to extract the backwash liquid from the first sub-receptacle 202, second sub-receptacle 204, third sub-receptacle 206, and fourth sub-receptacle 208 from the outlet 224, so that the particulate filter media 200 dispersed in the receptacle returns to the third sub-receptacle 206 along with the backwash liquid. Alternatively, the liquid to be filtered is introduced through the inlet, so that the particulate filter media 200 dispersed in the receptacle returns to the third sub-receptacle 206 along with the liquid to be filtered. Repeat step S603 until the particulate filter media 200 returns to the third sub-receptacle 206.

[0156] The motor 222 drives the arched filter screen 212 to move along the flow direction F1 of the liquid to be powered into the second sub-accommodating cavity 204, so that the arched filter screen 212 is sealed to the inner wall of the second sub-accommodating cavity 204.

[0157] Step S604: The liquid to be filtered is introduced into the receiving cavity through the liquid inlet 210 to filter the liquid. The liquid to be filtered is tested by the pH tester 226, the first residual chlorine tester 228, the second residual chlorine tester 230, the turbidity meter 232, and the pressure sensor. If at least one of the real-time data from the pH tester 226, the first residual chlorine tester 228, the second residual chlorine tester 230, the turbidity meter 232, and the pressure sensor does not meet its corresponding preset threshold, the particulate filter medium 200 is backwashed again according to the above backwashing steps until the backwashing effect meets the requirements.

[0158] For information regarding the filtration device, the filtration of the liquid to be filtered, and backwashing, please refer to the relevant descriptions in the foregoing embodiments, which will not be repeated here.

[0159] This embodiment also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can run on the processor, wherein when the processor runs the computer program, it performs the filtering method and the backwashing method as described above.

[0160] refer to Figure 4 This is a schematic diagram of an optional hardware structure of the electronic device provided in the embodiments of this application.

[0161] The device of the present invention includes: at least one processor 900, at least one communication interface 901, at least one memory 902 and at least one communication bus 903.

[0162] In some embodiments, the number of processor 900, communication interface 901, memory 902 and communication bus 903 is at least one, and processor 900, communication interface 901 and memory 902 communicate with each other through communication bus 903.

[0163] The communication interface 901 can be an interface for a communication module used for network communication, such as an interface for a GSM module.

[0164] The processor 900 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the filtering and backwashing methods of this embodiment.

[0165] The memory 902 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0166] The memory 902 stores one or more computer instructions, which are executed by the processor 900 to implement the aforementioned filtering and anti-washing methods.

[0167] It should be noted that the above-mentioned electronic device may also include other devices (not shown) that may not be essential to the content of this application; given that these other devices may not be essential for understanding the application content of the embodiments of this invention, this invention will not describe them one by one.

[0168] Accordingly, the present invention also provides a computer program product, including a computer program / instruction, which, when executed by a processor, is used to implement a filtering method and a reverse washing method.

[0169] The present invention also provides a computer-readable storage medium storing one or more computer instructions for implementing a filtering method and a backwashing method.

[0170] It should be understood that in the embodiments of this application, the processor can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0171] It should be understood that the memory in this embodiment can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Non-volatile memory can be ROM, programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), which serves as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0172] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, all or part of the processes or functions described in this embodiment are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program can be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means.

[0173] While the embodiments disclosed in this application are as described above, the invention is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of this invention; therefore, the scope of protection of this invention should be determined by the scope defined in the claims.

Claims

1. A filtration device, characterized in that, Used to extend the service life of particulate filter media and improve backwashing efficiency, including: A receiving cavity for containing particulate filter media, the receiving cavity comprising a first sub-receiving cavity, a second sub-receiving cavity and a third sub-receiving cavity connected in sequence along the flow direction of the liquid to be filtered, the bottom of the first sub-receiving cavity being connected through the top of the second sub-receiving cavity, and the bottom of the second sub-receiving cavity being connected through the top of the third sub-receiving cavity. Along the flow direction of the liquid to be filtered, the cross-sectional area of ​​the first sub-receptacle gradually decreases, the cross-sectional area of ​​the second sub-receptacle remains constant, and the cross-sectional area of ​​the third sub-receptacle gradually increases. The top of the first sub-cavity is provided with a liquid inlet; Arched filter screen, including: The first mesh body arches towards the liquid inlet; The support portion has one end connected to the outer periphery of the first mesh body and is sealed to the inner wall of the second sub-accommodating cavity.

2. The filtration device as described in claim 1, characterized in that, The arched filter screen further includes: a second mesh body, with the other end of the support portion surrounding and connected to the outer periphery of the second mesh body; The cross-section of the second mesh body perpendicular to the flow direction of the liquid to be filtered is parallel to the plane containing the bottom of the second sub-containment cavity; The top end face of one end of the support portion and the bottom of the first sub-receiving cavity are located in a first plane, and the bottom end face of the other end of the support portion and the bottom of the second sub-receiving cavity are located in a second plane.

3. The filtration device as described in claim 1, characterized in that, The first sub-cavity is an upper frustum that is larger at the top and smaller at the bottom; the second sub-cavity is a cylinder that is open at both ends; and the third sub-cavity is a lower frustum that is smaller at the top and larger at the bottom.

4. The filtration device as described in claim 1, characterized in that, The particulate filter media includes one or more of the following: resin particles, montmorillonite particles, ion exchange fiber particles, and activated carbon particles.

5. The filtration device as claimed in claim 1, characterized in that, The bottom of the third sub-receptacle is provided with a bottom filter screen for supporting the particulate filter medium.

6. The filtration device as described in claim 5, characterized in that, Also includes: A connecting rod, one end of which is detachably and fixedly connected to the arched filter screen; A motor is provided, with the other end of the connecting rod connected to the motor, for driving the arched filter screen to move forward and backward along the axial extension direction of the receiving cavity.

7. The filtration device as claimed in claim 1, characterized in that, Also includes: A fourth sub-receiving cavity, the top of which is connected through to the bottom of the third sub-receiving cavity; The pH meter is located on the inner wall of the fourth sub-containment chamber.

8. The filtration device as claimed in claim 7, characterized in that, Also includes: The first residual chlorine tester is located in the first sub-containment cavity, and the second residual chlorine tester is located in the fourth sub-containment cavity.

9. The apparatus as claimed in claim 7, characterized in that, Its characteristic is that it further includes: a turbidimeter, located on the outer wall of the fourth sub-accommodating cavity.

10. The filtration device as claimed in claim 1, characterized in that, Also includes: A multi-layer pressure sensor, located within the third sub-containment cavity and arranged along the flow direction of the liquid to be filtered, is used to detect the increase in interlayer pressure difference.

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