Disc fiber filter with automatic backwashing function

Abstract

This utility model relates to the field of water treatment technology and discloses a disc fiber filter device with automatic backwashing function. It includes a filter unit, a backwashing unit, and a PLC control unit. The filter unit includes multiple disc filters and multiple ultrafiltration fiber filters connected in parallel. The disc filters and ultrafiltration fiber filters are also connected in parallel. The backwashing unit includes multiple three-way valves connected in series with the disc filters and ultrafiltration fiber filters, respectively. The PLC control unit includes a PLC controller, a first differential pressure sensor, a second differential pressure sensor, and multiple solenoid valves. In this utility model, the disc filters and ultrafiltration membrane filters are used in series to fully utilize their respective advantages and increase the filtered water flow rate. The automatic backwashing function performs backwashing during the water production process without affecting the water production process.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, and in particular to a stacked fiber filter device with automatic backwashing function. Background Technology

[0002] Disc filters are a type of filter that uses the grooves of stacked plastic discs to form deep filtration. Its core component is a filter element made up of a set of plastic discs with grooves on both sides in different directions.

[0003] Existing patent (publication number: CN214551593U) discloses "a disc filter, including a housing, wherein multiple stacked discs are disposed within the housing, an inlet pipe is disposed on the side wall of the housing near the bottom edge, and an inlet valve is disposed on the inlet pipe, and an outlet pipe is disposed at the bottom of the housing, and an outlet valve is disposed on the outlet pipe; the discs include a tapered section with openings at the top and bottom, an annular section is disposed on the lower edge of the side wall of the tapered section, and a first inclined groove is disposed on both the inner and outer walls of the tapered section, and the first inclined grooves on the inner and outer walls of the tapered section have opposite inclination directions, and a second inclined groove is disposed on the top surface of the annular section, the second inclined groove having an inclination direction opposite to that of the first inclined groove on the outer wall of the tapered section. This utility model patent adopts the above structure, which can effectively improve the backwashing effect while achieving the purpose of automated backwashing of the disc filter."

[0004] In the process of developing this application, the inventors discovered the following problems with the existing technology: Traditional disc filters have limited filtration accuracy and cannot effectively remove fine particles and colloids. Ultrafiltration membrane fiber filtration has low coarse filtration efficiency and is easily clogged by large particles, affecting the utilization efficiency of the ultrafiltration fibers. Conventional backwashing methods require stopping water production and entering a dedicated backwashing mode, which cannot continuously produce water and requires shutdown for backwashing, affecting continuous production.

[0005] Therefore, those skilled in the art have provided a stacked fiber filter device with automatic backwashing function to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a disc fiber filter device with automatic backwashing function. This device combines a disc filter and an ultrafiltration membrane filter in series, fully leveraging their respective advantages to increase the filtered water flow rate. The automatic backwashing function performs backwashing during the water production process without affecting the overall water production process.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A disc fiber filter device with automatic backwashing function includes a filter unit, a backwashing unit and a PLC control unit. The filter unit includes multiple disc filters and multiple ultrafiltration fiber filters. The multiple disc filters are connected in parallel and the multiple ultrafiltration fiber filters are connected in parallel. The backwashing unit includes multiple three-way valves, which are connected in series with the multiple disc filters and the multiple ultrafiltration fiber filters, respectively.

[0009] The PLC control unit includes a PLC controller, a first differential pressure sensor, a second differential pressure sensor, and multiple solenoid valves. The PLC controller automatically starts the backwashing function according to the differential pressure trigger condition, supports differential pressure triggering, timed triggering, or mixed mode, and can adjust the backwashing duration and number of backwashes. The PLC controller is electrically connected to the first differential pressure sensor, the second differential pressure sensor, and the solenoid valves. The first differential pressure sensor is connected to multiple disc filters, the second differential pressure sensor is connected to multiple ultrafiltration fiber filters, and the multiple solenoid valves are respectively connected to multiple three-way valves.

[0010] Furthermore, the number of disc filters and ultrafiltration fiber filters can be increased or decreased according to the water production demand.

[0011] Furthermore, the disc filter is pre-positioned to trap particles >20μm and protect the ultrafiltration fibers.

[0012] Furthermore, the ultrafiltration fiber filter is placed after the filter for fine filtration, retaining particles larger than 0.01μm.

[0013] Furthermore, the first differential pressure sensor and the second differential pressure sensor are used to monitor the pressure difference between the inlet and outlet water of the multiple disc filters and the multiple ultrafiltration fiber filters, respectively.

[0014] Furthermore, multiple three-way valves are used to switch between water production and backwashing states.

[0015] Furthermore, multiple solenoid valves are used to execute PLC control commands to switch the operating state of the three-way valve.

[0016] This utility model has the following beneficial effects:

[0017] 1. The stacked fiber filter device with automatic backwashing function proposed in this utility model has a stacked filter in the front, which can effectively intercept particulate impurities larger than 20 microns, reducing the burden on the subsequent ultrafiltration fiber filter. The ultrafiltration fiber filter in the back can perform fine filtration, intercepting particles larger than 0.01 microns, ensuring that the effluent water quality reaches a higher standard. The two are used together to give full play to their respective advantages and increase the filtered water flow rate.

[0018] 2. The stacked fiber filter device with automatic backwashing function proposed in this utility model has a PLC controller that automatically starts the backwashing function according to the pressure difference or timing conditions, without the need for manual intervention, which improves the convenience of operation and the degree of automation. At the same time, the device supports multiple triggering modes, which can be flexibly selected according to different working conditions, making it highly adaptable. During the backwashing process, other filters still remain in the water production state, without affecting normal water production, ensuring continuous water supply, and is particularly suitable for occasions that require uninterrupted water supply. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the water purification system of this utility model;

[0020] Figure 2 This is a schematic diagram of the water production process of this utility model;

[0021] Figure 3 This is a schematic diagram of the backwashing state of this utility model.

[0022] Legend:

[0023] 1. First differential pressure sensor; 2. Second differential pressure sensor; 3. Disc filter; 4. Three-way valve; 5. Ultrafiltration fiber filter; 6. Solenoid valve. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Reference Figure 1 , Figure 2 and Figure 3 One embodiment provided by this utility model:

[0026] A disc fiber filter device with automatic backwashing function includes a filter unit, a backwashing unit and a PLC control unit. The filter unit includes multiple disc filters 3 and multiple ultrafiltration fiber filters 5. The multiple disc filters 3 are connected in parallel and the multiple ultrafiltration fiber filters 5 are connected in parallel. The backwashing unit includes multiple three-way valves 4, which are connected in series with the multiple disc filters 3 and the multiple ultrafiltration fiber filters 5 respectively.

[0027] The PLC control unit includes a PLC controller, a first differential pressure sensor 1, a second differential pressure sensor 2, and multiple solenoid valves 6. The PLC controller automatically starts the backwashing function according to the differential pressure triggering condition, supports differential pressure triggering, timed triggering, or mixed mode, and can adjust the backwashing duration and number of backwashes. The PLC controller is electrically connected to the first differential pressure sensor 1, the second differential pressure sensor 2, and the solenoid valves 6. The first differential pressure sensor 1 is connected to multiple disc filters 3, the second differential pressure sensor 2 is connected to multiple ultrafiltration fiber filters 5, and the multiple solenoid valves 6 are respectively connected to multiple three-way valves 4.

[0028] The number of disc filters 3 and ultrafiltration fiber filters 5 can be increased or decreased according to the water production demand. Disc filters 3 are placed in the front to intercept particles >20μm and protect the ultrafiltration fibers. Ultrafiltration fiber filters 5 are placed in the back for fine filtration, intercepting particles larger than 0.01μm. The first differential pressure sensor 1 and the second differential pressure sensor 2 are used to monitor the pressure difference between the inlet and outlet water of the disc filters 3 and the ultrafiltration fiber filters 5, respectively. Multiple three-way valves 4 are used to switch between water production and backwashing states. Multiple solenoid valves 6 are used to execute PLC control commands to switch the working state of the three-way valves 4.

[0029] Specifically, the filtration section of the device consists of a stacked disc filter unit composed of multiple disc filters 3 and an ultrafiltration fiber filter unit composed of multiple ultrafiltration fiber filters 5 connected in series. In water production mode, water flows in through the inlet, and the three-way valve 4 is in water production mode. After diversion, the water flows directly into the disc filter 3 through the three-way valve 4 for coarse filtration, removing large particulate impurities and effectively reducing the burden on the subsequent filtration units. After being filtered by the disc filter unit, the water flows through the manifold and then diverts through another set of three-way valves 4 to enter the ultrafiltration fiber filter 5 for secondary ultrafiltration. After filtration, the water flows back together and then exits, completing the entire filtration process.

[0030] When entering backwash mode, the PLC controller individually polls and switches the three-way valve 4 according to the backwash duration and number of cycles. Each time, one three-way valve 4 is switched to enter backwash mode. When a designated three-way valve 4 enters backwash mode, the single filter connected to it is backwashed, while other filters continue normal filtration and water production. The produced water flows back through the collection pipe from the filter currently being backwashed, achieving backwashing. The backwashed water flows through the three-way valve 4 in backwash mode and is discharged through the drain pipe. The water flow directions of the three-way valve 4 in water production and backwash modes are as follows: Figure 2 and Figure 3 As shown, backwashing does not require stopping water production. When one filter is being backwashed, the other filters continue to produce water without affecting water production.

[0031] The PLC controller automatically starts the backwashing function based on the differential pressure trigger condition, and sequentially polls each solenoid valve 6 to drive the connected three-way valve 4 into the backwashing state.

[0032] Working Principle: When in use, water enters the filtration system through the inlet, first passing through a three-way valve 4 (in water production mode). After passing through valve 4, the water enters the disc filter 3 for coarse filtration. The disc filter 3 can trap particles larger than 20 microns, effectively reducing the burden on subsequent filtration units. The water filtered by the disc filter 3 is collected through a manifold and then diverted through another set of three-way valves 4 to the ultrafiltration fiber filter 5. The ultrafiltration fiber filter 5 performs secondary filtration, trapping particles larger than 0.01 microns, further improving water quality. The water, after fine filtration, is collected again and flows out from the outlet, completing the entire filtration process. The first differential pressure sensor 1 and the second differential pressure sensor 2 monitor the disc filter 3 and the ultrafiltration fiber filter, respectively. The pressure difference between the inlet and outlet water of filter 5 changes. When the pressure difference reaches the set threshold, the PLC controller automatically starts the backwash function according to the pressure difference trigger condition. The PLC controller supports pressure difference trigger, timed trigger or mixed mode, and can adjust the backwash duration and backwash number. According to the set conditions, the PLC controller polls each solenoid valve 6 in turn and drives the connected three-way valve 4 to enter the backwash state. When the designated three-way valve 4 enters the backwash state, the single filter connected to it starts backwashing, while other filters remain in the water production state, without affecting water production. During backwashing, the produced water flows back from the backwashing filter through the collection pipeline to achieve backwashing. The backwashed water flows into the drain pipe through the three-way valve 4 in the backwash state and is discharged. After the backwash is completed, the three-way valve 4 returns to the water production state and continues the normal filtration and water production process.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A laminated fiber filter device with automatic backwashing function, comprising a filter unit, a backwashing unit and a PLC control unit, characterized in that: The filtration unit includes multiple disc filters (3) and multiple ultrafiltration fiber filters (5), the multiple disc filters (3) are connected in parallel, the multiple ultrafiltration fiber filters (5) are connected in parallel, and the backwashing unit includes multiple three-way valves (4), the multiple three-way valves (4) are connected in series with the multiple disc filters (3) and the multiple ultrafiltration fiber filters (5). The PLC control unit includes a PLC controller, a first differential pressure sensor (1), a second differential pressure sensor (2), and multiple solenoid valves (6). The PLC controller automatically starts the backwashing function according to the differential pressure triggering condition, supports differential pressure triggering, timed triggering, or mixed mode, and can adjust the backwashing duration and number of backwashes. The PLC controller is electrically connected to the first differential pressure sensor (1), the second differential pressure sensor (2), and the solenoid valves (6). The first differential pressure sensor (1) is connected to multiple disc filters (3), the second differential pressure sensor (2) is connected to multiple ultrafiltration fiber filters (5), and the multiple solenoid valves (6) are respectively connected to multiple three-way valves (4).

2. The stacked fiber filter device with automatic backwashing function according to claim 1, characterized in that: The number of disc filters (3) and ultrafiltration fiber filters (5) can be increased or decreased according to the water production demand.

3. The stacked fiber filter device with automatic backwashing function according to claim 1, characterized in that: The disc filter (3) is pre-positioned to trap particles >20μm and protect the ultrafiltration fibers.

4. The stacked fiber filter device with automatic backwashing function according to claim 1, characterized in that: The ultrafiltration fiber filter (5) is placed after the filter and is used for fine filtration to retain particles larger than 0.01μm.

5. The stacked fiber filter device with automatic backwashing function according to claim 1, characterized in that: The first differential pressure sensor (1) and the second differential pressure sensor (2) are used to monitor the pressure difference between the inlet and outlet water of multiple disc filters (3) and multiple ultrafiltration fiber filters (5), respectively.

6. The stacked fiber filter device with automatic backwashing function according to claim 1, characterized in that: Multiple three-way valves (4) are used to switch between water production and backwashing states.

7. The stacked fiber filter device with automatic backwashing function according to claim 1, characterized in that: Multiple solenoid valves (6) are used to execute PLC control commands to switch the working state of the three-way valve (4).

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