Semi-automatic backwashing laminated filter

Abstract

The utility model discloses a semi-automatic backwashing laminated filter. The external structure of the semi-automatic backwashing laminated filter comprises a handle, a filter base body, a water inlet, a water outlet, a laminated shell, a blow-down valve, a blockage indicator, a filter screen flushing valve and the like, the internal structure comprises a flow direction selector, a butterfly check valve, a laminated filter element, a rotational flow centrifugal disc, a laminated compression inner cover, a laminated compression outer cover, a spring between the laminated compression inner cover and the laminated compression outer cover and the like. The channel position of the flow direction selector is switched by rotating the handle, so that the switching between the filtering mode and the backwashing mode is realized. In a filtering mode, muddy water flows into a raw water cavity outside the lamination after being accelerated by the rotational flow centrifugal disc, impurities are intercepted, and clear water flows into a downstream pipeline; and in a backwashing mode, the water flow is sprayed out from the spraying holes in the filter element frame by pressing the position of the lamination for compressing the inner cover and loosening the lamination, so that impurities are eluted from the lamination and discharged through the blow-down valve. In addition, a filter screen is arranged on the flow direction selector to intercept impurities of flushing water, and the filter screen can be flushed in a filtering mode. The utility model has the advantages of convenient use and simple structure.

Description

Technical Field

[0001] This utility model relates to a semi-automatic backwashing disc filter, belonging to the technical field of water purification equipment. Background Technology

[0002] A disc filter cartridge consists of a set of tightly stacked discs with grooves. When water flows through the discs, the intersections formed by the groove edges trap solids in the water. This dual effect of surface interception and deep coagulation significantly improves filtration efficiency. During normal operation, turbid water passes through the discs from the outside of the cartridge. The discs are tightly pressed together by spring force or other limiting structures, trapping impurities at the intersections. The filtered water flows out through the filter outlet via the inner cavity of the cartridge. When a large amount of impurities is trapped, the local pressure loss in the filter increases, requiring flushing of the discs. Currently, disc filters on the market offer manual flushing or automatic backwashing modes. Manual flushing requires the user to remove the filter cartridge, loosen the clamping nut or other limiting devices, and then wash the discs with water. This process is cumbersome and time-consuming. Furthermore, manual flushing requires an additional pressure gauge to monitor the pressure difference between upstream and downstream areas to indirectly determine filter clogging, occupying significant installation space and failing to provide a direct and timely indication of clogging, thus affecting irrigation efficiency. Automatic backwash disc filters, equipped with a three-way automatic backwash valve and backwash controller, automatically perform backwashing operations through differential pressure setting mode or time mode, greatly simplifying the cleaning process. However, the addition of these automated devices significantly increases the cost of the automatic backwash filter.

[0003] Therefore, developing a new type of semi-automatic backwashing disc filter technology is particularly important. The semi-automatic backwashing disc filter achieves fast and convenient maintenance and cleaning while effectively controlling costs, effectively solving the problems of time-consuming and labor-intensive cleaning in the current manual flushing mode. Furthermore, it eliminates the need for equipment such as a three-way automatic backwashing valve and a backwashing controller, making it more economical than automatic backwashing disc filters. Utility Model Content

[0004] Manually rinsing disc filters has the following drawbacks:

[0005] 1. When the filter element is severely clogged and requires cleaning and maintenance, the entire irrigation system must be shut down first, or the front-end valve must be closed to release the pressure. Then, the filter housing and filter element must be disassembled and cleaned manually. After maintenance, the system must be reinstalled and restarted. After startup, the system will require a considerable period of stable operation. The entire maintenance process is cumbersome, time-consuming, and labor-intensive, severely impacting the timeliness and continuity of irrigation operations.

[0006] 2. The clogging status inside the filter is difficult to monitor intuitively, in real-time, and accurately. An additional pressure gauge is required to monitor the pressure difference between the upstream and downstream sides to infer the degree of clogging. This monitoring method not only occupies additional installation space and increases equipment costs, but also suffers from a lack of intuitive monitoring.

[0007] Automatic backwashing disc filters have a high equipment cost, which is difficult for some users to afford.

[0008] If the turbid water contains a large amount of impurities, these impurities will accumulate inside the filter element during backwashing. When the filter switches from backwashing mode to filtration mode, the filtered water will also flow through the filter element into the downstream pipe. This process inadvertently introduces the impurities accumulated during backwashing into the downstream pipe system, failing to achieve the intended high-efficiency filtration. Furthermore, these impurities may clog the backwash nozzles, thus affecting the backwashing effect.

[0009] In addition, existing filters have a single installation connection method, mainly threaded or flanged interfaces. The installation method is relatively simple, and corresponding pipe fittings need to be equipped according to the interface type of the filter.

[0010] In view of this, the purpose of this utility model is to provide a semi-automatic backwashing disc filter, which can conveniently switch between filtration mode and backwashing mode; its backwashing process uses turbid water from the same water source to flow into the filter element cavity and then backwash the discs through the spray holes on the filter element; in addition, the disc filter can also be equipped with a blockage indicator. When the pressure difference between the inlet and outlet water reaches a certain level, the blockage indicator will automatically pop up, prompting the operator to switch the filter to backwashing mode. After the discs are flushed, when switching back to filtration mode, the blockage indicator will automatically reset.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] A semi-automatic backwash disc filter, comprising:

[0013] The filter substrate is an open-bottom cavity with an inlet and an outlet at the substrate inlet and outlet on its side wall, respectively. A disc housing is sealed and fixed to the bottom of the filter substrate, and a drain valve is located at its bottom. The disc housing is used to house the disc filter element. The disc filter element includes a filter element frame and discs fitted outside the filter element frame. The filter element frame has a disc limiting structure at the upper edge of the discs, and a disc clamping device is fixedly connected to the lower end of the filter element frame. The disc limiting structure and the disc clamping device... The devices work together to press the stacked discs together; the space surrounding the stacked discs forms a filter cartridge cavity, and the stacking disc pressing device seals the lower opening of the filter cartridge cavity; the semi-automatic backwashing disc filter also includes a flow direction selector and a filter cartridge holder; the flow direction selector is a cylindrical cavity housed within the filter body, closed at the top and open at the bottom, and is connected to a handle at the top; the filtration mode and backwashing mode of the semi-automatic backwashing disc filter are switched by rotating the handle; the filter cartridge holder is located within the stacking disc limiting structure. All the above structures are sealed and fixedly connected to the lower sidewall of the flow selector, and the filter cartridge cavity is in communication with the flow selector; the space between the stacked plates and the inner wall of the stacked plate housing forms the raw water cavity, and the filter cartridge cavity is only in communication with the raw water cavity through the filter holes on the stacked plates; the four sidewalls of the flow selector are provided with azimuth planes A, B, C, and D; the sidewall of the flow selector located on azimuth plane A has no openings, and there is a gap between the sidewall of the flow selector located on azimuth plane A and the sidewall of the filter base. There is a channel connecting the raw water chamber; a water outlet is provided on the side wall of the flow direction selector located on the azimuth plane B, and in the filtration mode, the water outlet connects the flow direction selector and the water outlet; a backwashing channel is provided on the side wall of the flow direction selector located on the azimuth plane C, and in the backwashing mode, the backwashing channel connects the water inlet and the flow direction selector; a completely sealed channel plug is provided on the side wall of the flow direction selector located on the azimuth plane D, for sealing the water outlet.

[0014] In the filtration mode, the water flow from the inlet enters the filter substrate through the substrate inlet hole. Due to being blocked by the side wall of the flow direction selector located on the orientation plane A, it can only enter the raw water chamber, then pass through the filter discs to enter the filter element chamber, then enter the flow direction selector, and finally flow into the outlet through the outlet channel and the substrate outlet hole.

[0015] In the backwashing mode, water from the inlet flows through the substrate inlet and the backwashing channel into the flow selector. Since the channel blockage blocks the substrate outlet, the water can only enter the filter cartridge chamber, then flow through the discs, carrying the dirt in the discs into the raw water chamber, and finally being discharged through the drain valve.

[0016] By adopting the above technical solution, the disc filter does not require backwash valves and backwash controllers, nor does it require manual cleaning of the disc filter element. It achieves efficient and convenient cleaning of the filter while maintaining economical manufacturing costs.

[0017] Preferably, the flow selector located on azimuth plane B has a sealing ring on its side wall that mates with the inner surface of the filter substrate's side wall around the water outlet of the substrate, to prevent water from flowing from the flow selector into the filter substrate in the filtration mode; the flow selector located on azimuth plane C has a sealing ring on its side wall that mates with the inner surface of the filter substrate's side wall around the water inlet of the substrate, to prevent water from flowing from the water inlet into the filter substrate in the backwashing mode; the flow selector located on azimuth plane D has a sealing ring on its side wall that mates with the inner surface of the filter substrate's side wall around the water outlet of the substrate, to prevent water from flowing from the filter substrate into the water outlet in the backwashing mode; The filter cartridge holder includes a connecting disc, a backwash frame, and a filter cartridge holder base. The connecting disc has a connecting disc body with an outer diameter larger than the inner diameter of the stacked discs, and a hollow cylindrical connecting disc insertion part that is fixedly connected to or integrally formed with the upper surface of the connecting disc body. The connecting disc insertion part is fixedly and sealed to the lower side wall of the flow direction selector. The stacked disc limiting structure is the connecting disc body. The backwash frame is a column located inside the filter cartridge cavity and arranged parallel to the axial direction of the filter cartridge cavity. The filter cartridge holder base is a disc body with an outer diameter smaller than the outer diameter of the stacked discs. The upper and lower ends of the backwash frame are fixedly connected to or integrally formed with the connecting disc body of the connecting disc and the filter cartridge holder base, respectively. The connecting disc body is provided with a filter cartridge outlet channel that connects the filter cartridge cavity and the flow direction selector.

[0018] By adopting the above technical solution, the semi-automatic backwashing disc filter has better sealing performance; the filter element has a simple structure and is easy to assemble.

[0019] Preferably, the backwash frame has multiple members and is positioned close to the stacked plates; the backwash frame has an internal cavity channel within its column, which connects to the connecting plate to form an open port and communicates with other frames through the connecting plate; the backwash frame has multiple axially spaced injection holes near the stacked plates, which communicate with the internal cavity channel of the backwash frame; a check valve is provided on the connecting plate, and the valve disc of the check valve covers the filter cartridge outlet channel, which only allows water to flow from the filter cartridge cavity through the filter cartridge outlet channel to the flow direction selector in the filtration mode.

[0020] By adopting the above technical solution, the setting of the check valve reduces the cross-sectional area of ​​the backwash water entering the filter cartridge cavity in the backwash mode, thereby increasing the kinetic energy of the water outlet of the jet hole and enhancing the backwash effect.

[0021] Preferably, the filter cartridge base has a through hole at the bottom of each backwash frame inner cavity channel; the disc clamping device is a disc spring cover device, which includes a disc clamping inner cover and a disc clamping outer cover, a spring, and a spring connecting rod; the spring connecting rod is vertically installed at the center of the disc clamping outer cover, and the upper end of the spring connecting rod passes through the circular hole in the center of the disc clamping inner cover and is bolted to the bottom of the filter cartridge base, thereby achieving a fixed connection between the disc clamping outer cover and the filter cartridge base; the spring is fitted onto the connecting rod and placed between the disc clamping inner cover and the disc clamping outer cover; the disc clamping inner cover has an upward-opening sleeve-like structure, and part of the side wall of the disc clamping inner cover is coaxially inserted into the disc clamping outer cover, and the upper part of the disc clamping inner cover is socket-type connected to the filter cartridge base. The upper outer edge of the stacked inner cover abuts against the lower edge of the stacked sheets; the stacked inner cover and the filter element frame base together form the inner cover chamber.

[0022] By adopting the above technical solution, the backwash water flow entering the filter element cavity in the backwash mode can enter the inner cover cavity. Under the action of water pressure, the stacked discs press against the inner cover to overcome the resistance of the spring and move downward, thereby loosening the stacked discs and further enhancing the cleaning effect of the stacked discs.

[0023] Preferably, there are four backwash frames arranged in a cross-shaped symmetrical distribution; the filter element frame has an inner cavity, which is a cylindrical space closed at the bottom and open at the top. The inner cavity extends from the center of the filter element frame base to the connecting plate and has an opening on the connecting plate; the side wall of the inner cavity is integrally formed with a portion of the column of the backwash frame near the axis of the filter element cavity, connecting the backwash frame into one unit; the side wall of the inner cavity, the backwash frame, and the space between the stacked plates form the outer cavity channel of the filter element frame; the check valve is a butterfly check valve, which is designed as an open port at the upper opening of the inner cavity of the filter element frame and the inner cavity channel of the backwash frame, and as a one-way valve disc at the upper opening of the outer cavity channel of the filter element frame, so that water can flow from the outer cavity channel of the filter element frame to the flow selector, but prevents water from flowing directly into the outer cavity channel of the filter element frame from the flow selector.

[0024] By adopting the above technical solution, the cross-shaped backwash frame has the technical effect of simple structure and stability. The inner cavity of the filter element frame can further reduce the manufacturing material of the filter element frame and provide convenience for molding and other molding processes.

[0025] Preferably, the flow selector has a top column at its top, which passes vertically through the opening at the top of the filter base. A sealing ring is provided at the part of the top column that contacts the filter base. The handle is fixedly connected to the upper end of the top column. A sealing ring is provided at the mating part of the stacked disc pressing inner cover and the filter element frame base. Two O-rings are provided on the stacked disc pressing inner cover at the part where the connecting rod passes through.

[0026] By adopting the above technical solution, the overall sealing performance of the semi-automatic backwash disc filter is further improved.

[0027] Preferably, a flow guide column is provided on the side wall of the flow selector located in the azimuth plane A, which is perpendicular to the side wall of the flow selector and extends towards the inlet; a vortex centrifugal disc is provided between the stacked shell and the stacked filter element; a filter screen is provided at the backwash channel port; and a filter screen flushing valve is provided on the filter body, which can be connected to the backwash channel port in the filtration mode.

[0028] By adopting the above technical solution, the swirling centrifugal disc makes the effective filtration area of ​​the filter element more uniform and extends the effective working time. The filter screen reduces the cleanliness requirements of the backwash water, further improving the backwashing effect. Furthermore, the filter screen flushing valve allows the filter screen to be automatically cleaned in filtration mode, enabling convenient and quick cleaning and maintenance of the filter without disassembling the filter housing, filter element, or stopping the irrigation system. This results in efficient, convenient, and fast flushing.

[0029] Preferably, the mounting interfaces of the inlet and the outlet are provided with annular grooves for clamp connection, the grooves being used to clamp the flange to the mounting interfaces of the inlet and the outlet.

[0030] By adopting the above technical solution, the filter's installation interface adopts a dual-purpose installation of grooved clamps and flanges, which can be adapted to various forms such as threads, grooved clamps, and flanges. The installation method is flexible and diverse, and it is convenient to equip relevant installation accessories and assemble flexibly on site.

[0031] Preferably, a blockage indicator is also provided. The inlet has a filter inlet connection port, and the outlet has a filter outlet connection port. The blockage indicator is connected to the filter inlet connection port, and the filter outlet connection port is connected to the blockage indicator through a command pipe, so that the pressure of the inlet and outlet can directly act on the blockage indicator.

[0032] By adopting the above technical solution, the degree of clogging of the filter can be understood in real time and intuitively through the clogging indicator on the filter, saving installation space and material costs.

[0033] Preferably, the blockage indicator includes an indicator housing, a docking base, a diaphragm, a spring assembly, and a warning top cover; one end of the docking base is provided with a water inlet connection port connected to the filter inlet connection port, and the other end of the docking base is fixedly connected to the indicator housing, the indicator housing and the docking base together forming the indicator cavity; one end of the docking base located in the indicator cavity is provided with a diaphragm base; the docking base has a base channel inside, the base channel being open at the water inlet connection port and the diaphragm base, for transmitting the fluid pressure of the water inlet connection port to the lower surface of the diaphragm; the diaphragm has elastic deformation capability, and the periphery of the lower surface of the diaphragm can seal and fit against the diaphragm base and close the blockage. The base channel has an opening in the inner cavity of the indicator; the indicator housing has a water outlet connection port with an internal channel, which is connected to the command tube to transmit the fluid pressure from the water outlet to the upper surface of the diaphragm; the spring assembly is located between the top wall of the indicator housing and the diaphragm, and the warning top cover is linked to the diaphragm through the spring assembly; the lower surface of the diaphragm bears the pressure from the water inlet, and the upper surface bears the combined force of the pressure from the water outlet and the elastic force of the spring assembly; when the combined force is less than the pressure from the water inlet, the diaphragm is lifted, triggering the warning top cover to pop out and displaying a blockage alarm; it also includes a pressure monitoring interface on the water outlet for connecting a pressure monitoring instrument.

[0034] By adopting the above technical solution, after the filter element is rinsed and reaches a certain level of cleanliness, the clogging indicator automatically resets when switching back to the filtration mode, improving the automation level of the clogging indicator. The pressure monitoring interface provides more options for monitoring the working status of the filter.

[0035] In summary, the present invention, by adopting the above-described technical solution, includes at least one of the following beneficial technical effects:

[0036] 1. No backwash valve or backwash controller is required, enabling efficient and convenient cleaning of the filter while maintaining cost-effectiveness;

[0037] 2. The filter can be easily and quickly cleaned and maintained without disassembling the filter housing, filter element, or stopping the irrigation system; the rinsing is efficient, convenient, and fast.

[0038] 3. A filter screen is designed at the backwash channel inlet to intercept impurities in the incoming water during backwashing mode, thereby ensuring that the performance of the filter is effectively maintained;

[0039] 4. The degree of filter clogging can be intuitively understood in real time through the clogging indicator on the filter, saving installation space and material costs;

[0040] 5. The filter's installation interface adopts a dual-purpose installation method of grooved clamps and flanges, which can be adapted to various forms such as threads, grooved clamps, and flanges. The installation method is flexible and diverse, making it easy to equip relevant installation accessories on site and flexibly assemble. Attached Figure Description

[0041] Figure 1 This is a diagram showing the external structure of a semi-automatic backwashing disc filter.

[0042] Figure 2 This is an exploded view of the internal structure of a semi-automatic backwash disc filter.

[0043] Figure 3 This is a diagram showing the internal structure of a semi-automatic backwashing disc filter element.

[0044] Figure 4 This is a cross-sectional view of the internal structure of the filter element in the backwashing mode of a semi-automatic backwashing disc filter.

[0045] Figure 5 This is a cross-sectional view of the internal structure of a semi-automatic backwashing disc filter cartridge in filtration mode.

[0046] Figure 6A A schematic diagram of the flow direction selector for a semi-automatic backwashing disc filter.

[0047] Figure 6B Schematic diagram of the flow direction selector for a semi-automatic backwash disc filter in different orientations;

[0048] Figure 7 A schematic diagram of the cyclone centrifugal disc structure of a semi-automatic backwashing disc filter;

[0049] Figure 8 This is a structural diagram of a semi-automatic backwashing disc filter cartridge holder.

[0050] Figure 9 This is a cross-sectional view of the internal structure of the filter element holder of a semi-automatic backwashing disc filter.

[0051] Figure 10 Top view of the internal structure of the filter element holder of an automatic backwashing disc filter;

[0052] Figure 11 Cross-sectional view of the disc spring cap device for a semi-automatic backwashing disc filter;

[0053] Figure 12 A schematic diagram of the flow direction selector operation for a semi-automatic backwash disc filter.

[0054] Figure 13 A schematic diagram illustrating the working principle of a semi-automatic backwashing disc filter in filtration mode.

[0055] Figure 14 This is a schematic diagram illustrating the working principle of the semi-automatic backwashing disc filter in backwashing mode.

[0056] Explanation of reference numerals in the attached figures:

[0057] 1. Handle; 2. Filter body; 3. Inlet / outlet connection flange; 4. Pressure monitoring interface; 5. Stainless steel clamp; 6. Disc housing; 7. Drain valve; 8. Filter inlet connection port; 9. Command pipe; 10. Blockage indicator; 11. Filter outlet connection port; 12. Filter screen flushing valve; 13. Flow direction selector; 14. Butterfly check valve; 15. Filter cartridge holder; 16. Cyclone disc; 17. Disc clamping inner cover; 18. Spring; 19. Disc clamping outer cover; 20. Sealing ring; 21. Top. 22. Main column, 23. Bolt, 24. Guide column, 25. Water outlet, 26. Backwash channel, 27. Channel plug, 28. Water inlet, 29. Raw water chamber, 30. Filter element frame inner cavity, 151. Filter element frame outer cavity channel, 152. Spray hole, 153. Filter element frame base, 154. Backwash frame, 155. Connecting plate, 156. Through hole, 157. Backwash frame inner cavity channel, 158. O-ring seal, 181. Inner cover chamber, 182. Spring connecting rod, 191. Detailed Implementation

[0058] 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 scope of protection of the present invention. It should also be noted that all directional indicators (such as up, down, left, right, front, back, inside, outside) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indicator will also change accordingly.

[0059] Figure 1 This is a diagram of the external structure of the filter.

[0060] As shown in Figure 1, this utility model provides a semi-automatic backwash disc filter, whose external structure includes a handle 1, a filter base 2, an inlet and outlet connecting flange 3, a pressure monitoring interface 4, a stainless steel clamp 5, a disc shell 6, a drain valve 7, a filter inlet connecting port 8, a command pipe 9, a blockage indicator 10, a filter outlet connecting port 11, a filter screen flushing valve 12, a water inlet 28, and a water outlet 29.

[0061] The filter base 2 has an overall cylindrical shape, narrower at the top and wider at the bottom, with a snap-fit ​​at the top for secure connection with the handle 1. Figure 1 and Figure 12 As shown, handle 1 is connected to flow selector 13 inside the filter structure via bolt 23. Rotating handle 1 allows for easy switching of the channel position within flow selector 13, enabling flexible switching between filtration and backwashing modes. The top housing is marked with "Backwash On" and "Backwash Off" indicator arrows to facilitate user identification of operating procedures. Figure 1 As shown, the bottom of the filter substrate 2 is sealed to the disc housing 6 using a stainless steel clamp 5.

[0062] The filter body 2 has inlets 28 and outlets 29 on both sides, both using a dual-purpose grooved clamp and flange installation, adaptable to various connector types, making installation simpler and more flexible. The inlets are marked with water flow direction indicators for easy identification by installers. Each inlet 28 and outlet 29 has a 1 / 4-inch male threaded through-hole, corresponding to the filter inlet connection port 8 and the filter outlet connection port 11, respectively. These two through-holes lead directly into the filter interior. The blockage indicator 10 can be directly connected to the filter inlet connection port 8, while the filter outlet connection port 11 is connected to the blockage indicator 10 via a command pipe 9. This allows the water pressure inside the inlet 28 and outlet 29 to directly act on the blockage indicator 10, and the pressure difference between the inlet and outlet triggers a blockage warning; the red top cover of the blockage indicator pops out, reminding the user to switch the filter to backwash mode for flushing.

[0063] The bottom of the laminated housing 6 has a male threaded interface for connection to the drain valve 7. To facilitate users in reading the pressure at the filter outlet, a pressure monitoring interface 4 is designed at the filter outlet, i.e., the water outlet 29. This interface has a female thread design and can be directly connected to a pressure gauge so that users can accurately and conveniently read the pressure value.

[0064] Figure 2 This is an exploded view of the filter's internal structure, such as... Figure 2 As shown, the internal structure of the filter includes a flow selector 13, a butterfly check valve 14, a filter element holder 15, a cyclone centrifugal disc 16, discs 17, a sealing ring 21, a disc clamping inner cover 18, a spring 19, and a disc clamping outer cover 20.

[0065] Figure 6A This is a schematic diagram of the filter flow direction selector structure. Figure 6B This is a schematic diagram of the filter flow direction selector in different orientations.

[0066] like Figure 6A ,6B As shown, the flow selector 13 has a hollow cylindrical structure and is a key component in the internal structure of this filter. Figure 1 and Figure 12 As shown, the top column 22, which is fixedly connected to the flow direction selector 13, is connected to the handle 1 via bolts 23, facilitating the switching of filter modes. Figure 2 As shown in Figure 6, the top column 22 is equipped with two sealing rings to ensure the sealing of the filter inside during the operation of the handle 1.

[0067] The flow selector 13 has four orientation planes A, B, C, and D, each with different functions and roles. For example, Figure 6B , Figure 3 and Figure 5 As shown, azimuth plane A has no opening. The function of azimuth plane A is to block the water flow from the inlet 28 into the flow selector 13 in filtration mode, and to guide the water flow through the guide column 24 on it, such as... Figure 13 As shown, the inlet water flow of the filter is guided to the swirling centrifugal disc 16 surrounding the lower end of the flow selector 13; the inlet water flow is accelerated by swirling through the swirling centrifugal disc 16 and flows evenly to the raw water chamber 30 on the outer side of the stack 17 under the action of centrifugal force. The structure of the swirling centrifugal disc 16 is as follows: Figure 7 As shown.

[0068] like Figure 6B As shown, the other three azimuth faces of the flow selector 13 are equipped with channel openings of different structures, each channel opening being equipped with a sealing ring to ensure the airtightness of the flow selector. Azimuth face B is designed as a completely open water outlet 25, as shown... Figure 13 As shown, it is used to transport the filtered clean water to the outlet 29; the azimuth surface C is designed as a backwash channel 26 with a filter screen to intercept impurities in the incoming water flow during the filter backwashing process.

[0069] During the backwashing process, water flows into the filter cartridge chamber and backwashes the discs through the spray nozzles on the cartridge. The backwashing process can utilize purified water from other sources by switching the upstream water supply pipe, but using the same water source in filtration mode will result in higher efficiency. If the incoming water contains a large amount of impurities, it will not only reduce the backwashing effect but also cause the impurities to accumulate inside the filter cartridge, making them difficult to remove during backwashing. Consequently, when the filter switches to filtration mode, the filtered water will carry these impurities into the downstream pipe, preventing the desired filtration effect from being achieved. Therefore, the filter is specially designed with a filter screen at the backwash channel port 26 on the flow selector 13 to intercept impurities. With continuous use, the intercepted impurities will gradually clog the filter screen. Therefore, if... Figure 1As shown, a 3 / 4-inch female threaded interface is designed on one side of the filter base 2, specifically for connecting the filter screen flushing valve 12. By turning the handle 1 to switch the channel position of the flow selector 13 and opening the filter screen flushing valve 12, the user can easily flush the filter screen, extending the filter's service life and maintaining its high-efficiency performance.

[0070] like Figure 6B , Figure 4 As shown, azimuth plane D is designed as a completely enclosed channel opening 27, as... Figure 14 As shown, it is used to block the filter outlet channel in backwashing mode, preventing the incoming water from flowing directly into the downstream pipeline.

[0071] Figure 8 This is a structural diagram of the filter cartridge holder. Figure 9 This is a cross-sectional view of the internal structure of the filter cartridge holder.

[0072] like Figure 8 , 9 As shown, the filter element holder 15 is integrally formed by a connecting plate 156, a filter element holder inner cavity 151, backwash frames 155, and a filter element holder base 154. The filter element holder inner cavity 151 has a cylindrical structure, with its upper end connected to the connecting plate to form an open port, and its lower end connected to the filter element holder base to form a closed structure. Four backwash frames 155 are connected to the outer side of the filter element holder inner cavity 151, and the four frames are distributed in a cross shape. The upper part of the backwash frame 155 is connected to the connecting plate 156 to form an open port and communicates with other backwash frames 155 through the connecting plate 156. The lower part of the backwash frame 155 is connected to the filter element holder base 154.

[0073] The connecting plate 156 is the junction of the filter element holder inner cavity 151, the backwash frame inner cavity channel 158, and the filter element holder outer cavity channel 152. For example... Figure 5 and Figure 9 As shown, a one-way valve, namely a butterfly check valve 14, is installed inside the connecting plate 156. The valve body is designed as an open port at the upper opening of the filter element holder inner cavity 151 and the skeleton inner cavity channel, allowing water to flow smoothly and freely. However, the butterfly check valve 14 is designed as a closed valve disc at the upper opening of the filter element holder outer cavity channel 152, allowing water to flow smoothly out of the filter element holder outer cavity channel 152 and be guided to the flow selector 13, but preventing water from directly flowing into the filter element holder outer cavity channel 152 through the flow selector 13. Therefore, it controls the direction of water flow inside the filter element holder in different filtration and backwashing modes.

[0074] Figure 10 This is a top view of the internal structure of the filter cartridge holder.

[0075] like Figure 10As shown, the backwash frame 155 is a hollow column structure, forming an internal cavity channel 158; the filter element holder base 154 has a through hole 157 at the bottom of each internal cavity channel 158 of the backwash frame. Axially spaced, equally spaced injection holes 153 are provided on the chamfered surface of the outer periphery of the backwash frame 155. Figure 8 , 9 and Figure 10 As shown, a semi-circular channel is formed between the adjacent backwash frame 155 and the side wall of the inner cavity 151 of the filter element frame, namely the outer cavity channel 152 of the filter element frame.

[0076] Figure 11 This is a cross-sectional view of the filter disc spring cap assembly.

[0077] like Figure 11 As shown, connected to the bottom of the filter element holder base 154 is a stacked spring cover device, which consists of a stacked inner cover 18, a stacked outer cover 20, a spring 19, and a spring connecting rod 191. The spring connecting rod 191 is vertically installed at the center of the stacked outer cover 20. The upper end of the connecting rod 191 passes through the stacked inner cover 18 and is securely connected to the filter element holder base 154 by bolts. The spring 19 is fitted onto the connecting rod 191 and positioned between the stacked inner cover 18 and the stacked outer cover 20.

[0078] The inner cover 18, which is a sleeve-shaped structure, forms an inner cover chamber 182. The central circular hole of the inner cover 18 allows the connecting rod 191 to pass through, thereby achieving a stable connection between the outer cover 20 and the filter element holder base 154. The upper end of the inner cover 18 is inserted into the filter element holder base 154 and equipped with a sealing ring 21 to ensure the sealing of the connection. The lower end is spring-connected to the outer cover 20 via a spring 19 and a connecting rod 191, and two O-rings 181 are provided at the passage of the connecting rod 191.

[0079] The working principle is explained below.

[0080] In filter mode:

[0081] Figure 12 This is a schematic diagram of the flow direction selector switching operation. Figure 13 This is a schematic diagram illustrating the working principle of the filter's filtration mode.

[0082] like Figure 12 As shown, when the disc 17 is in the clean state, turbid water flows into the filter through the inlet 28; at this time, as... Figure 13As shown, the orientation surface A of the flow selector 13 is aligned with the inlet 28. Under the guidance of the guide column 24, the turbid water undergoes fluid separation and flows directly into the vortex centrifugal disc 16. As the vortex centrifugal disc 16 rotates, the turbid water is accelerated by rotation and flows to the raw water chamber 30 outside the filter disc 17 through the action of centrifugal force. The turbid water passes through the disc 17 from the outside. At this time, the disc 17 is subjected to the spring force generated by the spring 19 through the disc pressing inner cover 18, and is tightly pressed together. Impurity particles are trapped at the intersection of the discs. After deep filtration, the clean water enters the outer cavity channel 152 of the filter element frame, and then flows into the connecting plate 156 on the upper part of the filter element frame. The connecting plate 156 has a built-in butterfly check valve 14. At this time, the butterfly check valve 14 is in an open state due to the water pressure below, allowing the filtered clean water to flow directly into the flow direction selector 13. Subsequently, the clean water flows out through the water outlet 25 on the flow direction selector 13 to the water outlet 29, and enters the downstream pipe of the filter.

[0083] In backwash mode:

[0084] When the disc 17 becomes severely clogged, the local pressure loss generated by the filter increases, leading to a decrease in pressure within the outlet 29. The clogging indicator 10, connected to the inlet 28 and outlet 29, will issue a clogging alarm; the red top cover of the indicator will pop out, reminding the user that the filter needs cleaning. At this time, if... Figure 12 As shown, simply rotating handle 1 90° clockwise will cause the flow direction selector 13 connected to it to switch the azimuth plane.

[0085] Figure 14 This is a schematic diagram illustrating the working principle of the filter backwashing mode.

[0086] like Figure 14As shown, the azimuth plane A, which was originally facing the inlet 28, is switched to azimuth plane C, so that the backwash channel 26 with the filter screen is connected to the inlet 28, while the completely sealed channel plug 27 is connected to the outlet 29. This prevents the incoming water from flowing directly to the outlet 29, but instead flows through the interior of the flow selector 13 to the butterfly check valve 14 at its bottom. At this time, the butterfly check valve 14 is in the closed state, blocking the outer cavity channel 152 of the filter element frame, while the inner cavity channel 158 of the backwash frame is allowed to flow through. The water flows into the stacked disc pressing inner cover chamber 182 through the inner cavity channel 158 of the backwash frame and the through hole 157 on the filter element frame base 154 connected to it. Under water pressure, the spring 19 is compressed, and the inner cover 18 of the stacked plates moves downward, causing the originally compressed stacked plates 17 to loosen. At the same time, water is sprayed out from the spray hole 153, and the pressure applied by the sprayed water effectively washes the stacked plates 17. The impurity particles that were originally intercepted in the filtration mode are washed along with the sprayed water to the original water chamber 30 on the outside of the stacked plates 17, and then discharged through the drain valve 7 connected to the bottom of the stacked plate housing 6, thereby achieving the washing and cleaning of the stacked plates 17.

[0087] Filter rinsing:

[0088] As the filter continues to be used, impurities trapped in the inlet water during backwashing will gradually clog the filter screen. To extend the filter's lifespan, the filter screen at the backwash channel 26 needs to be flushed regularly.

[0089] Therefore, simply keep the filter in filtration mode, that is, align the azimuth face A of the flow selector 13 with the inlet 28, i.e. Figure 13 , Figure 12 and Figure 1 As shown, the orientation surface C of the flow direction selector 13 is aligned with the filter screen flushing valve 12. When the filter is running normally, the filter screen flushing valve 12 is opened, and the water flow into the filter completes the filtration according to the working principle of the filtration mode. The filtered clean water flows into the interior of the flow direction selector 13 through the outer cavity channel 152 of the filter element frame. The clean water will be discharged from the filter body through the filter screen flushing valve 12, completing the flushing of the filter screen at the backwashing channel port 26.

[0090] The above description is a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model. These improvements and modifications are also considered to be within the protection scope of the present utility model, and the protection scope of the present utility model shall be defined by the claims.

Claims

1. A semi-automatic backwashing disc filter, comprising: The filter substrate (2) is a cavity with an open bottom. The substrate inlet (28) and the substrate outlet (29) are respectively provided at the substrate inlet hole and the substrate outlet hole on its side wall. The disc housing (6) is sealed and fixed to the bottom of the filter base, and a drain valve (7) is provided at the bottom. The disc housing (6) is used to accommodate the disc filter element. A stacked filter element includes a filter element frame (15) and stacked discs (17) sleeved outside the filter element frame (15). The filter element frame (15) has a stacked disc limiting structure at the upper edge of the stacked discs (17). A stacked disc pressing device is fixedly connected to the lower end of the filter element frame (15). The stacked disc limiting structure and the stacked disc pressing device cooperate with each other to press the stacked discs (17) together. The stacked discs (17) surround a space that forms a filter element cavity, and the stacked disc pressing device closes the lower opening of the filter element cavity; Its features are, The semi-automatic backwash disc filter also includes a flow direction selector (13) and a filter element holder (15). The flow selector (13) is a cylindrical cavity housed within the filter substrate (2), closed at the top and open at the bottom. It is connected to the handle (1) through the top. The filtration mode and backwashing mode of the semi-automatic backwashing disc filter are switched by rotating the handle (1). The entire structure of the filter element frame (15) above the stacked plate limiting structure is sealed and fixedly connected to the lower side wall of the flow direction selector (13), and the filter element cavity is connected to the flow direction selector (13); The space between the stacked plates (17) and the inner wall of the stacked plate shell (6) forms the raw water cavity (30), and the filter element cavity is connected to the raw water cavity (30) only through the filter holes on the stacked plates (17); The flow direction selector (13) has four sidewalls with azimuth planes A, B, C, and D; The sidewall of the flow selector (13) located in the azimuth plane A has no openings, and there is a channel between the sidewall of the flow selector (13) located in the azimuth plane A and the sidewall of the filter substrate (2) that connects to the raw water chamber (30). A water outlet (25) is provided on the side wall of the flow selector (13) located on the azimuth plane B. In the filtration mode, the water outlet (25) connects the flow selector (13) and the water outlet (29). A backwashing channel (26) is provided on the side wall of the flow selector (13) located on the azimuth plane C. In the backwashing mode, the backwashing channel (26) connects the water inlet (28) and the flow selector (13). The flow direction selector (13) located on the azimuth plane D has a completely closed channel plug (27) on its side wall for sealing the outlet (29). In the filtration mode, the water flow from the inlet (28) enters the filter substrate (2) through the substrate inlet hole. Due to being blocked by the side wall of the flow direction selector (13) located on the orientation plane A, it can only enter the raw water chamber (30), then enter the filter element chamber through the filter plate (17), then enter the flow direction selector (13), and finally flow into the outlet (29) through the outlet channel (25) and the substrate outlet hole. In the backwash mode, water from the inlet (28) flows through the substrate inlet hole and the backwash channel (26) into the flow selector (13). Since the channel block (27) blocks the substrate outlet hole, the water can only enter the filter cartridge cavity, then flow through the stack (17), carrying the dirt in the stack (17) into the raw water cavity (30), and finally discharged through the drain valve (7).

2. The semi-automatic backwashing disc filter according to claim 1, characterized in that: The flow selector (13) located on the orientation plane B is provided with a sealing ring that matches the inner surface of the side wall of the filter substrate (2) around the water outlet of the substrate, so as to block water from flowing from the flow selector (13) into the filter substrate (2) in the filtration mode. The flow selector (13) located on the azimuth plane C is provided with a sealing ring that matches the inner surface of the side wall of the filter substrate (2) around the water inlet of the substrate, so as to block water from flowing into the filter substrate (2) from the water inlet (28) in the backwash mode. The flow selector (13) located on the orientation plane D is provided with a sealing ring that matches the inner surface of the side wall of the filter substrate (2) around the water outlet of the substrate, so as to block water from flowing from the filter substrate (2) into the water outlet (29) in the backwash mode. The filter element holder (15) includes a connecting plate (156), a backwash frame (155), and a filter element holder base (154). The connecting disc (156) has a connecting disc body with an outer diameter larger than the inner diameter of the stack (17) and a hollow cylindrical connecting disc insertion part that is fixedly connected to or integrally formed with the upper surface of the connecting disc body. The connecting disc insertion part is fixedly and sealed to the lower side wall of the flow selector (13). The stack limiting structure is the connecting disc body. The backwash frame (155) is a column located inside the filter element cavity and arranged parallel to the axial direction of the filter element cavity; The filter element holder base (154) is a disc with an outer diameter smaller than that of the stacked discs (17); The upper and lower ends of the backwash frame (155) are fixedly connected to the connecting plate body of the connecting plate (156) and the filter element frame base (154) or integrally formed. The connecting plate body is provided with a filter cartridge outlet channel that connects the filter cartridge cavity and the flow direction selector (13).

3. The semi-automatic backwashing disc filter according to claim 2, characterized in that: The backwash frame (155) has multiple components and is positioned close to the stack (17). The backwash frame (155) has an inner cavity channel (158) inside its column. The inner cavity channel (158) is connected to the connecting plate (156) to form an open port and communicates with other frames through the connecting plate (156). The backwash frame (155) has a plurality of axially spaced spray holes (153) near the stack (17), and the spray holes (153) are connected to the inner cavity channel (158) of the backwash frame. A check valve is provided on the connecting plate (156). The valve disc of the check valve is covered on the water outlet channel of the filter element. The check valve only allows water to flow from the filter element cavity through the water outlet channel to the flow selector (13) in the filtration mode.

4. The semi-automatic backwashing disc filter according to claim 3, characterized in that: The filter cartridge base (154) has a through hole (157) at the bottom of each backwash frame inner cavity channel (158). The stacked plate pressing device is a stacked plate spring pressing device, which includes a stacked plate pressing inner cover (18) and a stacked plate pressing outer cover (20), a spring (19) and a spring connecting rod (191). A spring connecting rod (191) is vertically installed at the center of the stacked plate pressing outer cover (20). The upper end of the spring connecting rod (191) passes through the round hole in the center of the stacked plate pressing inner cover (18) and is bolted to the bottom of the filter element frame base (154), thereby realizing the fixed connection between the stacked plate pressing outer cover (20) and the filter element frame base (154). The spring (19) is fitted onto the connecting rod (191) and placed between the inner cover (18) and the outer cover (20); The inner cover (18) of the stacked plates is a sleeve-shaped structure with an upward opening. Part of the side wall of the inner cover (18) is coaxially inserted into the outer cover (20) of the stacked plates. The upper part of the inner cover (18) is connected to the filter element frame base (154) in a socket-type connection. The upper outer edge of the inner cover (18) abuts against the lower edge of the stacked plates (17). The stacked inner cover (18) and the filter element frame base (154) together form the inner cover chamber (182).

5. The semi-automatic backwashing disc filter according to claim 4, characterized in that: The backwash frame (155) has four parts and is arranged in a cross-shaped symmetrical distribution; The filter element holder (15) has a filter element holder cavity (151), which is a cylindrical space that is closed at the bottom and open at the top. The filter element holder cavity (151) extends from the center of the filter element holder base (154) to the connecting plate (156) and has an opening on the connecting plate (156). The side wall of the inner cavity (151) of the filter element frame is integrally formed with the part of the column of the backwash frame (155) near the axis of the filter element cavity, thus connecting the backwash frame (155) into one piece. The space between the inner cavity (151) of the filter element frame, the backwash frame (155), and the stacked plates (17) forms the outer cavity channel (152) of the filter element frame. The check valve is a butterfly check valve (14). The butterfly check valve (14) is designed as an open port at the upper opening of the inner cavity (151) of the filter element frame and the inner cavity channel (158) of the backwash frame. The butterfly check valve is designed as a one-way valve at the upper opening of the outer cavity channel (152) of the filter element frame, so that the water flow can flow from the outer cavity channel (152) of the filter element frame to the flow direction selector (13), but prevents the water flow from the flow direction selector (13) to flow directly into the outer cavity channel (152) of the filter element frame.

6. The semi-automatic backwashing disc filter according to claim 5, characterized in that: The flow selector (13) is provided with a top column (22) at the top. The top column (22) passes vertically through the opening at the top of the filter base (2). The part of the top column (22) that contacts the filter base (2) is provided with a sealing ring. The handle (1) is fixedly connected to the upper end of the top column (22). The mating part of the stacked inner cover (18) and the filter element frame base (154) is equipped with a sealing ring (21). The stacked inner cover (18) has two O-rings (181) at the passage of the connecting rod (191).

7. The semi-automatic backwashing disc filter according to any one of claims 1 to 6, characterized in that: A flow guide column (24) is provided on the side wall of the flow selector (13) located on the azimuth plane A, which is perpendicular to the side wall of the flow selector (13) and extends toward the inlet (28). A vortex centrifugal disc (16) is provided between the stacked shell (6) and the stacked filter element. The backwash channel opening (26) is equipped with a filter screen; The filter substrate (2) is provided with a filter screen flushing valve (12), which can be connected to the backwashing channel (26) in the filtration mode.

8. The semi-automatic backwashing disc filter according to any one of claims 1 to 6, characterized in that: The mounting interfaces of the inlet (28) and the outlet (29) are provided with annular grooves for clamp connection. The grooves are used to clamp the flange to the mounting interfaces of the inlet (28) and the outlet (29).

9. The semi-automatic backwashing disc filter according to any one of claims 1 to 6, characterized in that: A blockage indicator (10) is also provided. The inlet (28) is provided with a filter inlet connection port (8), and the outlet (29) is provided with a filter outlet connection port (11). The blockage indicator (10) is connected to the filter inlet connection port (8), and the filter outlet connection port (11) is connected to the blockage indicator (10) through a command pipe (9), so that the pressure of the inlet (28) and the outlet (29) can directly act on the blockage indicator (10).

10. The semi-automatic backwashing disc filter according to claim 9, characterized in that: The blockage indicator (10) includes an indicator housing, a docking base, a diaphragm, a spring assembly, and a warning top cover; One end of the docking base is provided with a water inlet connection port that is connected to the filter inlet connection port (8), and the other end of the docking base is fixedly connected to the indicator housing. The indicator housing and the docking base together form the indicator cavity. The docking base is provided with a diaphragm base at one end of the inner cavity of the indicator; The docking base has a base channel inside, which opens into the water inlet connection port and the diaphragm base to transmit the fluid pressure of the water inlet connection port to the lower surface of the diaphragm. The diaphragm has elastic deformation capability, and the periphery of the lower surface of the diaphragm can seal and fit the diaphragm base and close the opening of the base channel in the inner cavity of the indicator. The indicator housing is provided with a water outlet connection port with an internal channel. The water outlet connection port is connected to the command tube (9) and is used to transmit the fluid pressure of the water outlet (29) to the upper surface of the diaphragm. The spring assembly is disposed between the top wall of the indicator housing and the diaphragm, and the warning top cover and the diaphragm are linked together by the spring assembly; The lower surface of the diaphragm bears the pressure from the inlet (28), and the upper surface bears the combined force of the pressure from the outlet (29) and the elastic force of the spring assembly; When the combined force is less than the pressure at the inlet (28), the diaphragm is lifted, triggering the warning top cover to pop out and displaying a blockage alarm; It also includes a pressure monitoring interface (4) located on the outlet (29) for connecting a pressure monitoring instrument.

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