Filtering and backwashing system

Abstract

The utility model relates to a filtering and backwashing system which comprises N pressurizing and filtering units, N is greater than or equal to 2, and each pressurizing and filtering unit comprises a filter and a pressurizing pump which are connected in series; each pressurizing and filtering unit is correspondingly provided with one electric valve; the controller is electrically connected with the booster pump and the electric valve, and by adopting the filtering and backwashing system, the problem of production interruption caused by backwashing of a filter in the prior art can be improved.

Description

Technical Field

[0001] This application relates to the field of filtration equipment technology, and in particular to a filtration backwashing system. Background Technology

[0002] Filtration equipment is widely used in municipal water supply, waste gas treatment, sewage treatment, agricultural irrigation, seawater desalination and other fields. It plays a key role in improving the quality of materials. Filtration equipment generally improves the interception capacity of dirt through filter layer materials, removes impurities through filtration, and then removes the accumulated dirt in the filter layer materials through the backwashing process to restore the filtration capacity.

[0003] In related technologies, backwashing systems require shutdown or rely on external high-pressure water sources for backwashing. Filter backwashing necessitates pausing the filtration process, leading to production interruptions and impacting overall processing efficiency. Utility Model Content

[0004] Based on this, a filter backwashing system is provided to improve the problem of production interruption caused by filter backwashing in the prior art.

[0005] On the one hand, a filter backwashing system is provided, comprising:

[0006] There are N pressurized filter units, where N≥2, and each pressurized filter unit includes a filter and a pressurized pump connected in series.

[0007] Each of the aforementioned pressure-boosting filter units is equipped with one electric valve.

[0008] The controller is electrically connected to the booster pump and the electric valve;

[0009] Wherein, the inlet of the electric valve is connected to at least the outlet of the corresponding booster filter unit, and the outlet of the electric valve is connected to at least the backwash inlet of the filter in the previous booster filter unit;

[0010] The controller is used to sequentially shut down the booster pumps in the booster filter units to be backwashed, and to open at least the electric valve and the booster pump corresponding to the next booster filter unit.

[0011] In one embodiment, the outlet of the first electric valve is connected to at least the backwash inlet of the filter in the last pressurized filter unit.

[0012] In one embodiment, the number of the booster filter unit and the electric valve is greater than or equal to 3, and the inlet of the electric valve is connected only to the outlet of the corresponding booster filter unit, and the outlet of the electric valve is connected only to the backwash inlet of the filter in the previous booster filter unit.

[0013] In one embodiment, a differential pressure sensor is further included, electrically connected to the controller, the differential pressure sensor being used to sense the differential pressure of any of the filters.

[0014] In one embodiment, the inlet of each of the pressurized filter units is connected to the same feed pipe and the outlet is connected to the same discharge pipe, and the differential pressure sensor is disposed between the feed pipe and the discharge pipe.

[0015] In one embodiment, the feed pipe is a water inlet pipe, and the discharge pipe is a water outlet pipe.

[0016] In one embodiment, an isolation component is further included, which is provided for each of the pressurized filtration units. The isolation component includes a first isolation device and a second isolation device, wherein the first isolation device is provided at the inlet of the pressurized filtration unit and the second isolation device is provided at the outlet of the pressurized filtration unit.

[0017] In one embodiment, the first isolation device includes a first isolation valve, and the second isolation device includes a second isolation valve.

[0018] In one embodiment, the second isolation device further includes a check valve, the inlet of which is connected to the booster pump of the corresponding booster filter unit, and the outlet of which is connected to the second isolation valve.

[0019] In one embodiment, the controller includes a timing module and a sequence configuration module. The timing module transmits the time signal of the cyclic timing to the sequence configuration module, which records the order of each pressurized filter unit to be backwashed and updates the order according to the time signal of the cyclic timing.

[0020] The aforementioned filtration backwashing system uses multiple pressurized filtration units for filtration and multiple electric valves to connect the backwashing inlet of the previous pressurized filtration unit to the outlet of the next pressurized filtration unit, thus forming a cascaded backwashing loop. When a pressurized filtration unit needs backwashing, the controller shuts down its pressurized pump and starts the pressurized pumps and electric valves of the adjacent units, using the operating pressure of the adjacent units to drive the backwashing. During backwashing, a certain supply capacity is maintained to ensure the system's continuous filtration capacity and improve overall efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the control logic of a filter backwashing system in one embodiment;

[0022] Figure 2 This is a schematic diagram of the structure of a filter backwashing system in one embodiment;

[0023] Figure 3 This is a schematic diagram of the filter backwashing system in another embodiment;

[0024] Figure 4 This is a schematic diagram of the filter backwashing system in another embodiment.

[0025] The attached icons are numbered as follows:

[0026] First booster filter unit 1A, second booster filter unit 1B, third booster filter unit 1C, first filter 11, second filter 21, third filter 31, booster pump 2, first booster pump 12, second booster pump 22, third booster pump 32, electric valve 4, first electric valve 41, second electric valve 42, third electric valve 43, controller 5, first isolation valve 61, check valve 62, second isolation valve 63, feed pipe 7, discharge pipe 8, and sewage pipe 9. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0028] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0029] The structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0030] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "transverse," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] The core function of filtration equipment is to remove impurities (such as solid particles and suspended matter) from fluid materials, thereby improving the quality of the materials. It has many applications in the fine treatment of liquids, gases, and even biological fluids. For example, in water supply systems, filtration equipment uses filters to remove suspended matter, colloids, and microorganisms to ensure that the water quality meets the standards.

[0032] Filters achieve filtration based on physical filtration mechanisms. They trap impurities in materials by setting up filter layers. These filter layers typically have a porous structure. As filtration proceeds, the amount of impurities trapped by the filter layers increases, gradually clogging the pores and reducing the filter's filtration capacity.

[0033] To enable the reuse of filters, a backwashing system is typically installed. The backwashing system restores the filter's filtration capacity by introducing fluid in the opposite direction to normal filtration. For example, while the normal water flow to the filter is from top to bottom, backwashing is from bottom to top. The impact force of the water flow or air-water mixture loosens the filter media and carries away impurities.

[0034] In related technologies, backwashing requires interrupting production, which affects the overall processing efficiency. This application provides a filtration backwashing system that achieves backwashing through a cascaded structure, avoiding overall shutdown.

[0035] The filter backwashing system can be applied to gas filtration systems such as air conditioning systems and ventilation systems, as well as water treatment systems such as water supply systems and wastewater treatment systems. For example, in one embodiment, the provided filter backwashing system is applied to a water supply system, with the water supply system's inlet pipe serving as the feed pipe 7 and the water supply system's outlet pipe serving as the discharge pipe 8. The filter backwashing system is connected between the inlet pipe and the outlet pipe. Furthermore, the inlet of each of the pressurized filter units is connected to the same feed pipe 7, and the outlet is connected to the same discharge pipe 8.

[0036] In one embodiment, the filtration backwashing system includes a booster filtration unit, an electric valve 4, and a controller 5. The booster filtration unit includes a filter and a booster pump 2 connected in series, and its control logic is as follows: Figure 1 As shown.

[0037] The number of pressurized filter units is N, and N≥2. In Figure 2, N=3 is used as an example. The inlet of each pressurized filter unit is connected to the feed pipe 7, and the outlet is connected to the discharge pipe 8.

[0038] When backwashing of any filter is not required, booster pump 2 can remain off, relying on inlet water pressure to achieve filtration and water supply; or it can remain on to achieve pressurized water supply.

[0039] The filter includes a filter inlet and a filter outlet. During normal filtration, the inlet water enters through the filter inlet and flows out through the filter outlet. The filter also includes a backwash inlet and a backwash outlet. During backwashing, the backwash medium enters through the backwash inlet and flows out through the backwash outlet. The backwash outlet of the filter in each pressurized filter unit is connected to the drain pipe 9.

[0040] For example, the filter inlet is connected to the water inlet pipe, the filter outlet is connected to the inlet of the booster pump 2, and the outlet of the booster pump 2 is connected to the water outlet pipe. The water first passes through the filter and then is pressurized before entering the water outlet pipe. Therefore, the outlet of the booster pump 2 is the outlet of the booster filter unit. This is the case in this embodiment.

[0041] In another possible implementation, the order of booster pump 2 and filter is reversed. The inlet of booster pump 2 is connected to the water inlet pipe, the outlet of booster pump 2 is connected to the filter inlet, and the filter outlet is connected to the water outlet pipe. The water inlet is first pressurized and then filtered before entering the water outlet pipe.

[0042] In this embodiment, the number of electric valves 4 is the same as the number of pressurized filter units, and electric valves 4 are provided for each pressurized filter unit, for example... Figure 2 In the process, the electric valve 4 includes a first electric valve 41, a second electric valve 42, and a third electric valve 43, and the pressurized filter unit includes a first pressurized filter unit 1A, a second pressurized filter unit 1B, and a third pressurized filter unit 1C. The first electric valve 41 is set corresponding to the first pressurized filter unit 1A, the second electric valve 42 is set corresponding to the second pressurized filter unit 1B, and the third electric valve 43 is set corresponding to the third pressurized filter unit 1C.

[0043] For ease of understanding, the first booster filter unit 1A includes a first booster pump 12 and a first filter 11, the second booster filter unit 1B includes a second booster pump 22 and a second filter 21, and the third booster filter unit 1C includes a third booster pump 32 and a third filter 31.

[0044] The controller 5 is electrically connected to the booster pump 2 and the electric valve 4. "Electrical connection" refers to a connection established through a conductor (such as a wire, circuit board trace, connector, etc.) or an electromagnetic field (such as wireless communication), which enables the transmission of electrical energy, electrical signals, or data between devices. In this embodiment, the controller 5 controls the start or stop of the booster pump 2 and the opening or closing of the electric valve 4 through the electrical connection.

[0045] The controller 5 can serve as the execution carrier for the circuit structure. For example, each module / unit can be configured as a component of the product, and the connections between each module / unit can be configured as a defined connection relationship between the components of the product. Signal acquisition, processing, and output can be performed through the components of the product to realize the control functions of the booster pump 2 and the electric valve 4. For example, the controller 5 can adopt various units that can realize adjustable signals, such as various microcontrollers, microcontrollers 5, DSPs (digital signal processors), FPGAs (Field-Programmable Gate Arrays), host computers, or central processing units (CPUs). In this embodiment, the controller 5 can adopt a microcontroller, and various control functions can be realized by programming the microcontroller.

[0046] In this embodiment, the inlet of the electric valve 4 is connected to at least the outlet of the corresponding booster filter unit, and the outlet of the electric valve 4 is connected to at least the backwash inlet of the filter in the preceding booster filter unit. The controller 5 is used to sequentially shut down the booster pump 2 in the booster filter unit to be backwashed, and to at least open the electric valve 4 and the booster pump 2 corresponding to the following booster filter unit.

[0047] Understandably, in one approach, the concepts of "front" and "rear" can be defined based on the installation position of the booster filter unit. For example, taking the right side as the rear, the booster filter unit to the right of the current booster filter unit is defined as the rear booster filter unit, and the booster filter unit to the left of the current booster filter unit is defined as the front booster filter unit. In another approach, the concepts of "front" and "rear" can be defined based on the logical order of the booster filter units. For example, each booster filter unit can be assigned a number, such as the aforementioned first booster filter unit 1A, second booster filter unit 1B, etc. The booster filter unit after the first booster filter unit 1A is defined as the second booster filter unit 1B, and the second booster filter unit 1B is also the front booster filter unit of the third booster filter unit 1C.

[0048] On the other hand, the outlet of the first electric valve 4 is connected to the backwash inlet of the filter in the last booster filter unit, thereby completing the cascading of N parts. At this time, the first booster filter unit 1A is the next booster filter unit after the Nth booster filter unit.

[0049] The following is a detailed explanation:

[0050] One connection method between electric valve 4 and the booster filter unit is as follows: Figure 2As shown, the inlet of the first electric valve 41 is connected only to the outlet of the first booster pump 12, and the outlet of the first electric valve 41 is connected only to the backwash inlet of the third filter 31; the inlet of the second electric valve 42 is connected only to the outlet of the second booster pump 22, and the outlet of the second electric valve 42 is connected only to the backwash inlet of the first filter 11; the inlet of the third electric valve 43 is connected only to the outlet of the third booster pump 32, and the outlet of the third electric valve 43 is connected only to the backwash inlet of the second filter 21.

[0051] In actual control, the need for backwashing of filters in any booster filter unit can be determined based on the pressure difference.

[0052] For example, when it is determined that the first filter 11 needs to be backwashed, the first booster pump 12 is turned off, the second booster pump 22 and the second electric valve 42 are turned on, the water is diverted from the second booster pump 22, and the booster pump 22 is used to backwash the first filter 11. At this time, the third booster pump 32 and the third filter 31 supply water normally.

[0053] When it is determined that the second filter 21 needs to be backwashed, the second booster pump 22 is turned off, the third booster pump 32 and the third electric valve 43 are turned on, the water is diverted from the third booster pump 32, and the booster pump 32 is used to backwash the second filter 21. At this time, the first booster pump 12 and the first filter 11 supply water normally.

[0054] When it is determined that the third filter 31 needs to be backwashed, the third booster pump 32 is turned off, the first booster pump 12 and the first electric valve 41 are turned on, the water is diverted from the first booster pump 12, and the booster pump 12 is used to backwash the third filter 31. At this time, the second booster pump 22 and the second filter 21 supply water normally.

[0055] In the above multi-group cascaded scheme, when N=2, the two booster filter units backwash each other, and the system still retains a certain filtration and water supply capacity by relying on diversion for backwashing. When N≥3, only two booster filter units are affected, and the remaining booster filter units maintain normal filtration and water supply.

[0056] Therefore, by sequentially shutting down the booster pump 2 in the booster filter unit to be backwashed, the backwashing can be driven by the operating pressure of the adjacent unit without having to shut down all the units, thus ensuring the continuous filtration capacity of the system.

[0057] It is understandable that "in order" can be based on the aforementioned numbering order, or it can be based on other conditions (such as usage time, pressure difference, etc.) to sort the booster filter units.

[0058] In another configuration, the inlet or outlet of the electric valve 4 can be connected to more booster filter units, such as... Figure 3As shown, the inlet of the second electric valve 42 is also connected to the outlet of the third booster pump 32. When the first filter 11 needs to be backwashed, the second electric valve 42 is opened and the second booster pump 22 and the third booster pump 32 are run. The flow can be diverted from the second booster pump 22 and the third booster pump 32 to achieve a higher flow rate backwash. This method can be applied when the specifications of the first filter 11 are larger than those of other filters.

[0059] In one implementation, such as Figure 4 As shown, the outlet of the third electric valve 43 is also connected to the backwash inlet of the first filter 11. When the first filter 11 and the second filter 21 need to be backwashed at the same time, the third electric valve 43 is opened and the third booster pump 32 is run. Based on the boosting of the third booster pump 32, the first filter 11 and the second filter 21 can be backwashed at the same time. This method can be applied when the specifications of the third booster pump 32 are larger than those of other booster pumps 2.

[0060] In the above embodiments, the degree of blockage is determined based on the pressure difference. The pressure difference is obtained based on a pressure difference sensor, which is a device used to measure the pressure difference between two different locations. It compares the pressure values ​​of two input ports (usually labeled as the high-pressure end and the low-pressure end) and outputs an electrical signal proportional to the difference between the two.

[0061] For example, a differential pressure sensor is provided for each filter to sense the differential pressure of any filter. Specifically, the high-pressure end of the differential pressure sensor is located at the filter inlet, and the low-pressure end is connected to the filter outlet. The differential pressure sensor is electrically connected to controller 5 and sends an electrical signal to controller 5. Controller 5 identifies the differential pressure of each filter based on the electrical signal. When multiple differential pressures exceed corresponding thresholds, the corresponding filters are backwashed.

[0062] In another embodiment, a differential pressure sensor is installed between the feed pipe 7 and the discharge pipe 8. Specifically, the high-pressure end of the differential pressure sensor is installed in the water inlet pipe, and the low-pressure end is installed in the water outlet pipe. During normal water supply, each booster is kept closed, and filtration is performed by relying on the inlet water pressure. When the pressure difference between the inlet and outlet water reaches the corresponding threshold, it indicates that the overall system does not meet the filtration requirements. At this time, each filter is backwashed in turn.

[0063] When multiple filters need to be backwashed, backwashing switching is performed based on the timing module and the sequence configuration module. For example, the controller 5 includes a timing module and a sequence configuration module. The timing module is used for cyclic timing (e.g., timing for 10 minutes each time) and transmits the time signal to the sequence configuration module. The sequence configuration module records the order of each pressurized filter unit to be backwashed (e.g., the numbers of the pressurized filter units to be backwashed are recorded in an array in order of size) so that the controller can perform backwashing sequentially according to the recorded order. When the backwashing of the previous filter reaches 10 minutes, the sequence configuration module deletes its number, updates the recorded order, resets the timing of the timing module to zero, and the controller 5 starts the backwashing control of the next filter.

[0064] On the other hand, the timing module also provides timing for the opening and closing of the electric valve 4. For example, when the first filter 11 is backwashed, the first booster pump 12 is turned off, the second booster pump 22 and the second electric valve 42 are turned on, and the timing starts for 10 minutes. When the 10 minutes are over, the second booster pump 22 is turned off, and after 5 seconds of timing, the second electric valve 42 is turned off, the first booster pump 12 is turned on, and then the second filter 21 is backwashed.

[0065] In some embodiments, the pressure-boosting filter unit is individually controlled by an isolation component. When a single pressure-boosting filter unit needs to stop working, it can be isolated from the pipeline network using the isolation component. For example, an isolation component is set for each pressure-boosting filter unit. The isolation component includes a first isolation device and a second isolation device. The first isolation device is set at the inlet of the pressure-boosting filter unit, for example, between the pressure-boosting filter unit and the feed pipeline 7. The second isolation device is set at the outlet of the pressure-boosting filter unit, that is, between the pressure-boosting filter unit and the discharge pipeline 8.

[0066] The first isolation device includes, for example, a first isolation valve 61, and the second isolation device includes, for example, a second isolation valve 63. The first isolation valve 61 and the second isolation valve 63 can be manual valves.

[0067] The second isolation device also includes a check valve 62, the inlet of which is connected to the booster pump 2 of the corresponding booster filter unit, and the outlet of which is connected to the second isolation valve 63. The check valve can backwash the system to prevent pressurized effluent from flowing back to the low-pressure booster filter unit that is being backwashed.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A filter backwashing system, characterized in that, include: The number of pressurized filter units is N, where N≥2, and each pressurized filter unit includes a filter and a pressurized pump connected in series (2); Electric valve (4), one electric valve (4) is provided for each of the pressurized filter units; The controller (5) is electrically connected to the booster pump (2) and the electric valve (4); Wherein, the inlet of the electric valve (4) is at least connected to the outlet of the corresponding booster filter unit, and the outlet of the electric valve (4) is at least connected to the backwash inlet of the filter in the previous booster filter unit; The controller (5) is used to sequentially shut down the booster pump (2) in the booster filter unit to be backwashed, and to open at least the electric valve (4) and the booster pump (2) corresponding to the next booster filter unit.

2. The filter backwashing system according to claim 1, characterized in that, The outlet of the first electric valve (4) is connected to at least the backwash inlet of the filter in the last pressurized filter unit.

3. The filter backwashing system according to claim 1, characterized in that, The number of the booster filter unit and the electric valve (4) is greater than or equal to 3, and the inlet of the electric valve (4) is only connected to the outlet of the corresponding booster filter unit, and the outlet of the electric valve (4) is only connected to the backwash inlet of the filter in the previous booster filter unit.

4. The filtration backwashing system according to claim 1, characterized in that, It also includes a differential pressure sensor electrically connected to the controller (5), the differential pressure sensor being used to sense the differential pressure of any of the filters.

5. The filtration backwashing system according to claim 4, characterized in that, The inlet of each of the pressurized filter units is connected to the same feed pipe (7), and the outlet is connected to the same discharge pipe (8). The differential pressure sensor is located between the feed pipe (7) and the discharge pipe (8).

6. The filter backwashing system according to claim 5, characterized in that, The feed pipe (7) is a water inlet pipe, and the discharge pipe (8) is a water outlet pipe.

7. The filter backwashing system according to claim 1, characterized in that, It also includes an isolation component, which is provided for each of the pressurized filtration units. The isolation component includes a first isolation device and a second isolation device. The first isolation device is provided at the inlet of the pressurized filtration unit, and the second isolation device is provided at the outlet of the pressurized filtration unit.

8. The filter backwashing system according to claim 7, characterized in that, The first isolation device includes a first isolation valve (61), and the second isolation device includes a second isolation valve (63).

9. The filter backwashing system according to claim 8, characterized in that, The second isolation device also includes a check valve (62), the inlet of which is connected to the booster pump (2) of the corresponding booster filter unit, and the outlet of which is connected to the second isolation valve (63).

10. The filter backwashing system according to any one of claims 1-9, characterized in that, The controller (5) includes a timing module and a sequence configuration module. The timing module is used to transmit the time signal of the cyclic timing to the sequence configuration module. The sequence configuration module is used to record the order of each pressurized filter unit to be backwashed and update the order according to the time signal of the cyclic timing.

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