A prefilter

Abstract

The application discloses a pre-filter, relates to the technical field of filters, and comprises a valve head, a first filter bottle, a second filter bottle and an embedded part. The two ends of the valve head along a first direction are respectively communicated with water pipes, the first filter bottle is connected to the first end of the valve head along a second direction, the inside of the first filter bottle is provided with a first filter core, the second filter bottle is connected to the second end of the valve head along the second direction, the inside of the second filter bottle is provided with a second filter core and an adapter, the embedded part is arranged in the inside of the valve head, the embedded part is provided with a raw water cavity, a filtered water cavity and a clean water cavity, water enters the first filter bottle from the one end of the valve head along the first direction through the raw water cavity, is filtered by the first filter core, sequentially passes through the filtered water cavity and the adapter into the second filter bottle, is filtered by the second filter core again and is guided to the other end of the valve head along the first direction to be discharged by the clean water cavity. The pre-filter solves the problems of flux attenuation after long-term operation of the existing double-filter-screen filter, sharp reduction of water quantity at the rear end and limited service life of the whole machine.

Description

Technical Field

[0001] This application relates to the field of filter technology, and in particular to a pre-filter. Background Technology

[0002] Currently, with residents' increasing demands for drinking water quality, pre-filters are commonly installed in under-sink pipes to ensure the stable operation of downstream smart water terminals and water purification equipment.

[0003] Current solutions often employ a dual-filter structure: two filter layers, inner and outer, are housed in a single filter bottle and fixed to the inner and outer sides of the frame, respectively. During wastewater discharge, only the surface of the outer filter is rinsed, thereby achieving cleaning and wastewater removal. However, due to the narrow gap between the frame and the filter, impurities accumulate continuously within the interlayer after long-term operation, making it difficult to completely remove them. This easily leads to blockages, resulting in reduced flow rate, a sharp decrease in downstream water volume, and ultimately, a shortened lifespan of the entire machine. Utility Model Content

[0004] The purpose of this application is to provide a pre-filter that solves the problems of flow rate decline, sharp reduction in downstream water volume, and limited service life of existing dual-screen filters after long-term operation.

[0005] To achieve the above objectives, this application provides a pre-filter, comprising:

[0006] A valve head, with its two ends along the first direction respectively used to connect to water pipes;

[0007] The first filter bottle is connected to the first end of the valve head along the second direction, and the first filter bottle is provided with a first filter element inside;

[0008] The second filter bottle is connected to the second end of the valve head along the second direction. The second filter bottle is equipped with a second filter element and an adapter inside. The adapter is located inside the second filter element.

[0009] An embedded component, located inside the valve head, has a raw water chamber, a filtered water chamber, and a purified water chamber. The raw water chamber and the purified water chamber are located on opposite sides of the filtered water chamber along the first direction, so that water enters the first filter bottle from one end of the valve head along the first direction through the raw water chamber, is filtered by the first filter element, and then sequentially enters the second filter bottle through the filtered water chamber and the adapter. After being filtered by the second filter element, the water is guided from the purified water chamber to the other end of the valve head along the first direction for discharge.

[0010] In some embodiments, the prefilter further includes:

[0011] The water distributor, fixed in the first filter bottle, is used to receive water diverted through the raw water chamber;

[0012] A switching element, movably connected to the insert and engaging with the filtered water chamber, is used to move relative to the insert in a second direction and between a first position and a second position, so as to open the flow channel of the water distributor into the first filter bottle in the first position and close the flow channel of the water distributor into the first filter bottle in the second position.

[0013] In some embodiments, the prefilter further includes:

[0014] Connector, used to connect with the switching component;

[0015] An impeller assembly, connected to a connector, is configured to drive the connector and switching element to move in a second direction under the influence of water flow.

[0016] In some embodiments, the first filter element includes a first frame and a first filter screen disposed on the first frame;

[0017] The pre-filter also includes:

[0018] The scraping assembly is located on the outer periphery of the first frame and is connected to the impeller assembly;

[0019] The scraping device, installed on the scraping assembly, is used to scrape the outer surface of the first filter screen and the inner surface of the first filter bottle.

[0020] In some embodiments, the prefilter further includes:

[0021] The sealing element is installed at the end of the first filter bottle away from the second filter bottle and is equipped with a rib. The rib is used to drive the impeller assembly and the scraping assembly to rotate.

[0022] A ball valve, connected to a seal, is equipped with a switch to control sewage discharge.

[0023] In some embodiments, the pre-filter further includes an elastic element abutting between the switching element and the first frame, the elastic element being used to provide an elastic force to the switching element to give the switching element a tendency to move from the second position to the first position.

[0024] In some embodiments, the insert is further provided with a backwash chamber located on the outer periphery of the filter water chamber. When the switching member is in the second position, water that enters the raw water chamber from one end of the valve head along the first direction can enter between the second filter element and the adapter through the backwash chamber to backwash the second filter element.

[0025] In some embodiments, the adapter is provided with an adapter cavity, which is used to guide water filtered by the first filter element into the second filter bottle, and also to guide water after backwashing the second filter element into the interior of the first filter element to backwash the first filter element.

[0026] The outer wall of the adapter is provided with a flow guiding structure, which is used to guide the water filtered by the second filter element to the water purification chamber.

[0027] In some embodiments, the switching element includes:

[0028] The docking end mates with the embedded component.

[0029] The connecting end is provided with external threads for threaded connection with the connecting parts;

[0030] An annular protrusion is located between the docking end and the connecting end to contact and abut against the water distributor, thereby closing the flow channel from the water distributor into the first filter bottle.

[0031] In some embodiments, the prefilter further includes:

[0032] A pressure gauge, located on the valve head, is used to detect the pressure inside the valve head;

[0033] The display, connected to the pressure gauge signal, is used to show the pressure inside the valve head.

[0034] Compared to the aforementioned background technology, the pre-filter provided in this application includes a valve head, a first filter bottle, a second filter bottle, and an insert. The valve head is connected to water pipes at both ends along a first direction. The first filter bottle is connected to the first end of the valve head along a second direction and contains a first filter element. The second filter bottle is connected to the second end of the valve head along a second direction and contains a second filter element and an adapter. The adapter is located inside the second filter element. The insert is located inside the valve head and contains a raw water chamber, a filtered water chamber, and a purified water chamber. The raw water chamber and the purified water chamber are located on opposite sides of the filtered water chamber along the first direction, so that water enters the first filter bottle from one end of the valve head along the first direction through the raw water chamber, is filtered by the first filter element, then sequentially passes through the filtered water chamber and the adapter into the second filter bottle, is filtered again by the second filter element, and is then guided by the purified water chamber to the other end of the valve head along the first direction for discharge.

[0035] This application embodiment separates the filtration function into two independent filter bottles, and integrates an embedded part inside the valve head to form a filtration channel. Its beneficial effects mainly include:

[0036] Compared to existing dual-layer filters that share the same frame within a single filter bottle, this application places the first and second filter elements in separate filter bottles. Raw water first undergoes primary filtration in the first filter bottle and then flows through the second filter bottle for secondary filtration. This independent dual-bottle "cavity-to-cavity" filtration optimizes the filtration path, eliminates narrow interlayers, and ensures sufficient filtration clearance. Impurities can directly enter and be trapped in their respective filter bottles with the water flow, fundamentally eliminating the risk of interlayer buildup and clogging. This increases the flow rate and improves the filtration effect, allowing the designed flow rate to be maintained for a longer period and preventing a decrease in downstream water output. Simultaneously, due to the reduced probability of clogging and increased dirt-holding capacity, the filter element cleaning or replacement cycle is extended, reducing the mechanical load and chemical corrosion risk of the entire machine, thus extending its lifespan. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the overall structure of the pre-filter in an embodiment of this application.

[0039] Figure 2 for Figure 1 The diagram shows the internal structure of the valve head in the pre-filter.

[0040] Figure 3 for Figure 1 The diagram shows the structure of the mesh cover in the pre-filter.

[0041] Figure 4 for Figure 1 The diagram shows the structure of the second skeleton in the pre-filter.

[0042] Figure 5 for Figure 1 The diagram shows the structure of the adapter in the pre-filter.

[0043] Figure 6 for Figure 1 The cross-sectional view of the embedded component in the pre-filter is shown.

[0044] Figure 7 for Figure 1 The diagram shows the overall structure of the embedded component in the pre-filter.

[0045] Figure 8 for Figure 1 The diagram shows the structure of the water distributor in the pre-filter.

[0046] Figure 9 for Figure 1 The diagram shows the structure of the switching element in the pre-filter.

[0047] Figure 10 for Figure 1 The diagram shows the structure of the first skeleton in the pre-filter.

[0048] Figure 11 for Figure 1 The diagram shows the structure of the scraping component in the pre-filter.

[0049] Figure 12 for Figure 1 The diagram shows the overall structure of the impeller assembly in the pre-filter.

[0050] Figure 13 for Figure 1 The exploded view of the impeller assembly in the pre-filter is shown.

[0051] Figure 14 for Figure 1 The diagram shows the structure of the scraping condition in the pre-filter.

[0052] Figure 15 for Figure 1 The diagram shows the pre-filter in filtration mode.

[0053] Figure 16 for Figure 1 The diagram shows the pre-filter in the flushing state.

[0054] in:

[0055] 1. Hot melt head;

[0056] 2. Nuts;

[0057] 3. Valve head; 301. First thread; 302. Second thread; 303. Third thread; 304. Fourth thread; 305. Welding point;

[0058] 4. Second filter bottle;

[0059] 5. Mesh cover; 501. First buckle; 502. Circular edge;

[0060] 6. Second frame; 601. First annular groove; 602. Second annular groove; 603. Inner annular rib; 604. Outer wall;

[0061] 7. Adapter; 701. Third annular groove; 702. Adapter cavity;

[0062] 8. Embedded components; 801. Raw water chamber; 802. Filtered water chamber; 803. Backwash chamber; 804. Clean water chamber;

[0063] 9. Takeover;

[0064] 10. Water distributor; 1001. Rib clamp; 1002. Water distribution blade; 1003. Circular rib;

[0065] 11. Switching component; 1101. Dating end; 1102. Fourth annular groove; 1103. Annular protrusion; 1104. Fifth annular groove; 1105. Connecting end;

[0066] 12. Elastic components;

[0067] 13. First frame; 1301. Sixth annular groove; 1302. Water passage hole; 1303. Sewage outlet; 1304. Second buckle;

[0068] 14. Scraping assembly; 1401. Polygonal hole; 1402. Spiral rib; 1403. Turbine;

[0069] 15. Impeller assembly; 1501. Inclined hole; 1502. Polygonal shaft;

[0070] 16. Sealing components;

[0071] 17. Ball valve;

[0072] 18. Connectors;

[0073] 19. Scraping conditions; 1901. Inner scraper; 1902. Outer scraper;

[0074] 20. First filter bottle. Detailed Implementation

[0075] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0076] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0077] Please see Figure 1 The pre-filter provided in this application embodiment includes a hot-melt head 1, a nut 2, a valve head 3, a first filter bottle 20, a second filter bottle 4, and an insert 8.

[0078] The heat fusion head 1 is used to heat fuse the household pipes. Its left end is the water inlet and its right end is the water outlet. Before heat fusion, the nut 2 needs to be put into it.

[0079] Nut 2 is fitted onto the heat fusion joint and threadedly connected to valve head 3 to fix valve head 3 and press its sealing gasket.

[0080] Please refer to the following: Figure 2 The valve head 3 is connected to water pipes at both ends along the first direction. The valve head 3 is made of metal. Inside, the connecting pipe 9 and the inner insert 8 are welded together by welding point 305. The connecting pipe 9 is welded to the left and right ends of the inner insert 8 to isolate the water from the metal contact area and prevent heavy metal precipitation. The first thread 301 and the second thread 302 are respectively connected to the internal thread of the nut 2. The third thread 303 is connected to the second filter bottle 4 (also called the upper filter bottle), and the fourth thread 304 is connected to the first filter bottle 20 (also called the lower filter bottle).

[0081] The first filter bottle 20 is used to receive filtered water. The first filter element is provided inside the first filter bottle 20. The external thread of the first filter bottle 20 is screwed into the fourth thread 304 of the first end of the valve head 3 along the second direction.

[0082] The second filter bottle 4 is used to receive filtered water. The second filter bottle 4 has a second filter element inside. The external thread of the second filter bottle 4 is screwed into the third thread 303 of the second end of the valve head 3 along the second direction.

[0083] Please refer to the following: Figure 5 The second filter bottle 4 is further equipped with a connector 7 located inside the second filter element. The connector 7 has a connector cavity 702, which guides the water filtered by the first filter element into the second filter bottle 4 so that the filtered water can be filtered again by the second filter element. A sealing ring is installed in the third annular groove 701 to seal its gap. Furthermore, the connector cavity 702 of the connector 7 also guides the water after backwashing the second filter element into the interior of the first filter element for backwashing the first filter element.

[0084] In addition, the outer wall of the adapter 7 is provided with a flow guiding structure, which is used to guide the water filtered by the second filter element to the water purification chamber 804 of the inner insert 8.

[0085] Please refer to the following: Figure 6 and Figure 7 The embedded part 8 is located inside the valve head 3. The left and right ends of the embedded part 8 are welded to the connecting pipe 9. The embedded part 8 has a raw water chamber 801, a filtered water chamber 802, and a purified water chamber 804. The raw water chamber 801 and the purified water chamber 804 are located on both sides of the filtered water chamber 802 along the first direction, so that water flows from one end of the valve head 3 along the first direction (e.g., ...). Figure 1 The water (shown at the left end) enters the first filter bottle 20 through the raw water chamber 801, is filtered by the first filter element, and then sequentially passes through the filtered water chamber 802 and the adapter 7 to enter the second filter bottle 4. After being filtered by the second filter element, the water is guided by the purified water chamber 804 to the other end of the valve head 3 along the first direction (as shown at the left end). Figure 1(As shown on the right end) is discharged.

[0086] As can be seen, unfiltered raw water can flow into the first filter bottle 20 through the raw water chamber 801, and after the first filtration, it flows into the second filtration system through the filtered water chamber 802. The purified water after the second filtration is transported to the end of the water supply through the purified water chamber 804.

[0087] It should be noted that the first direction mentioned above is as follows: Figure 1 The X-axis direction or the horizontal direction shown is the second direction, which is as follows: Figure 1 The Y-axis direction or vertical direction shown.

[0088] This application embodiment separates the filtration function into two independent filter bottles, and integrates an embedded part 8 inside the valve head 3 to form a filtration channel. Its beneficial effects mainly include:

[0089] Compared to existing dual-layer filters that share the same frame in a single filter bottle, this application places the first and second filter elements in separate filter bottles. Raw water first undergoes first-stage filtration in the first filter bottle 20, and then flows through the second filter bottle 4 for second-stage filtration. This independent dual-bottle "cavity-to-cavity" filtration optimizes the filtration path, eliminates narrow interlayers, and ensures sufficient filtration working gaps. Impurities can directly enter their respective filter bottles with the water flow and be trapped, fundamentally eliminating the risk of interlayer accumulation and clogging. This increases the flow rate and improves the filtration effect, allowing the designed flow rate to be maintained for a long time and preventing a decrease in downstream water output. Simultaneously, due to the reduced probability of clogging and increased dirt-holding capacity, the filter element cleaning or replacement cycle is extended, and the mechanical load and chemical corrosion risk of the entire machine decrease simultaneously, thus extending the overall lifespan of the machine.

[0090] Please refer to the following: Figure 3 and Figure 4 The pre-filter also includes a mesh cover 5, and the second filter element includes a second frame 6 and a second filter screen disposed on the second frame 6. The mesh cover 5 has a first buckle 501 inside, which engages with the second annular groove 602 of the second frame 6. The annular edge 502 presses against the outer end of the second filter screen of the second frame 6 to prevent the second filter screen from coming out. A layer of stainless steel filter screen is fitted onto the outer end of the outer wall 604 of the second frame 6, forming a two-stage filtration system. An O-ring is installed in the first annular groove 601 to seal its gap, and the end face of the inner annular rib 603 limits and abuts against the adapter 7. Multiple slots and holes are used for water flow.

[0091] Please refer to the following: Figure 8 and Figure 9 The pre-filter also includes a water distributor 10 and a switching element 11.

[0092] The water distributor 10 is fixed in the first filter bottle 20. The water distributor 10 is used to receive water guided by the raw water chamber 801. The water distributor 10 is provided with four retaining ribs 1001, which are engaged in the four slots of the first filter bottle 20. The water distribution blades 1002 are used to annularly divide the raw water to form turbulent water. The annular ribs 1003 are engaged with the second buckles 1304 on the first frame 13. The switching member 11 is movably connected to the inner insert 8 and the switching member 11 is connected to the filtered water chamber 802. The switching member 11 is used to move relative to the inner insert 8 along the second direction and between the first position and the second position, so as to open the flow channel of the water distributor 10 into the first filter bottle 20 when in the first position and close the flow channel of the water distributor 10 into the first filter bottle 20 when in the second position.

[0093] Specifically, the switching component 11 includes a docking end 1101, a connecting end 1105, and an annular protrusion 1103. The docking end 1101 docks with the insert 8; the connecting end 1105 has an external thread and is used to thread it to the connector 18; the annular protrusion 1103 is located between the docking end 1101 and the connecting end 1105 and is used to contact and abut against the distributor 10 to close the flow channel of the distributor 10 into the first filter bottle 20.

[0094] The pre-filter also includes an elastic element 12 (specifically a compression spring), which abuts against the switching element 11 and the first frame 13. The elastic element 12 provides an elastic force to the switching element 11, causing the switching element 11 to tend to move from the second position to the first position. That is, the elastic element 12 serves to reset the switching element 11.

[0095] As can be seen, the switching component 11 is used to switch the water path. During filtration, the switching component 11 is supported and the filtration water path is opened. During flushing, the switching component 11 presses down the spring, the annular protrusion 1103 closes with the water distributor 10, and the filtration water flow channel is closed. The fourth annular groove 1102 is fitted with a sealing ring to seal its gap. The fifth annular groove 1104 is fitted with a sealing gasket and is in low contact with the drain port 1303 of the first frame 13. The docking end 1101 docks with the filtration water chamber 802, and the connecting end 1105 (specifically, the thread) docks with the inner thread of the connecting component 18.

[0096] Please refer to the following: Figure 10 , Figure 11 and Figure 14The first filter element includes a first frame 13 and a first filter screen disposed on the first frame 13. The first frame 13 is snapped into the inside of the water distributor 10, and its outer ring is fitted with a filter screen to support the filter screen and prevent deformation. A sealing ring is installed in the sixth annular groove 1301 to seal its gap. Several water passage holes 1302 are opened around the first frame 13. During sewage flushing, sewage is discharged from the sewage outlet 1303. The pre-filter also includes a scraping assembly 14 and a scraping condition 19. The scraping assembly 14 is located on the outer periphery of the first frame 13 and is connected to the impeller assembly 15. The polygonal hole 1401 at the bottom of the scraping assembly 14 engages with the polygonal rotating shaft 1502 extending from the impeller assembly 15. The scraping assembly 14 has staggered brush strips distributed on it. The pressure cap fixes it to the scraping assembly 14 to ensure stability. When water flows through the spiral rib 1402, it can increase the rotation speed of the scraping assembly 14. The top of the scraping assembly 14 is snapped with a turbine 1403, which can drive the drive assembly to rotate and reduce its starting flow when water flows through it. The scraping condition 19 is snapped onto the scraper cover, and the scraper cover is then snapped onto the scraping assembly 14. The scraping condition 19 includes an inner scraper 1901 and an outer scraper 1902, which are used to scrape the outer surface of the first filter screen and the inner surface of the first filter bottle 20, respectively.

[0097] Please refer to the following: Figure 12 and Figure 13 The pre-filter also includes a connector 18 and an impeller assembly 15.

[0098] The connector 18 connects the impeller assembly 15 and the switching component 11, and has a magnet inside to achieve magnetized water purification. The impeller assembly 15 is connected to the connector 18 and is configured to drive the connector 18 and the switching component 11 to move in a second direction under the driving force of water flow. Specifically, the impeller assembly 15 is a drive assembly consisting of an upper cover, a lower cover, an impeller, and an outer silicone ring. When discharging sewage, the water flow through the inclined hole 1501 can drive the impeller assembly 15 to rotate rapidly, thereby driving the scraping component 14 to rotate rapidly. The impeller assembly 15 moves downward, and through the connector 18, it drives the switching component 11 to compress the reset spring and move downward, opening the flushing water path.

[0099] In some embodiments, the pre-filter further includes a seal 16 and a ball valve 17.

[0100] The sealing element 16 is installed at the end of the first filter bottle 20 away from the second filter bottle 4. The top of the sealing element 16 is provided with two horn ribs, which are used to drive the impeller assembly 15 and the scraping assembly 14 to rotate, so as to achieve the purpose of forced sewage discharge. The annular groove of the sealing element 16 is equipped with two sealing rings to seal the gap between it and the filter bottle. The middle water passage hole is used to discharge sewage. The internal thread is engaged with the external thread of the ball valve 17. When the impeller assembly 15 is stuck due to impurities, it can be adjusted to the sewage discharge mode and switch to the manual scraping function.

[0101] Ball valve 17 is connected to seal 16, and ball valve 17 is equipped with a switch to control sewage discharge. Opening ball valve 17 allows for sewage discharge, and closing ball valve 17 enables filtration. The external thread on ball valve 17 mates with seal 16.

[0102] To facilitate the backwashing function, the embedded part 8 is also provided with a backwashing chamber 803, which is located on the outer periphery of the filter water chamber 802. The backwashing chamber 803 is also called the backwashing flow channel. When the switching part 11 moves down, the backwashing water path opens, and water flows into this chamber to the inner cavity of the second frame 6. Specifically, when the switching part 11 is in the second position, the water that enters the original water chamber 801 from one end of the valve head 3 along the first direction can enter between the second filter element and the adapter 7 through the backwashing chamber 803 to backwash the second filter element.

[0103] To facilitate real-time pressure monitoring, the pre-filter also includes a pressure gauge and a display.

[0104] The pressure gauge is located on the valve head 3 and is used to detect the pressure inside the valve head 3; the display is connected to the pressure gauge signal and is used to display the pressure inside the valve head 3.

[0105] The filtration and backwashing process of the pre-filter in this embodiment is described in detail below:

[0106] Please refer to the following: Figure 15 During filtration, the source water enters from the left end of the valve head 3, passes through the raw water chamber 801 and enters the first filter bottle 20, and is filtered by the first filter element. The filtered water is then transported from the middle of the first filter element to the inside of the second filter bottle 4 and the outside of the second filter element for a second stage of filtration. Finally, it is transported from the inner cavity of the second filter bottle 4 to the water end through the clean water chamber 804.

[0107] Please refer to the following: Figure 16 When the bottom drain ball valve 17 is opened, the filter bottle is under negative pressure. The switching element 11 moves down and the spring is compressed, opening the drain channel inside the valve head 3. Water flows from the top of the switching element 11 into the backwash chamber 803 and then backwashes the first filter screen from inside the second frame 6. Dirt flows into the first filter element with the water inside the adapter 7 for backwashing. At this time, both the second-stage filter drain hole and the first-stage filter drain hole are open. Simultaneously, the drain avoids the accumulation and residue of impurities between the two-stage filter components.

[0108] This pre-filter features a dual-bottle filtration design. Raw water first undergoes a first-stage filtration in the lower filter chamber on the left, then a second-stage fine filtration in the upper filter chamber. This dual-bottle "chamber-to-chamber" filtration optimizes the water flow and achieves efficient connection. Finally, water exits from the right outlet, ensuring sufficient filtration working gap, increasing flow rate and improving filtration efficiency. During wastewater discharge, water flows from the inside of the upper filter element to the outside for backwashing, then backwashes from the inside of the lower filter. Both stages of the dual-filtration system have their wastewater outlets open for backwashing and wastewater discharge, ensuring efficient flushing. Finally, the water is discharged from the lower outlet. This design incorporates a welded lead-blocking design to prevent lead leaching from the interior.

[0109] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0110] The pre-filter provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A prefilter, characterized by, include: The valve head (3) has two ends along the first direction for connecting water pipes; The first filter bottle (20) is connected to the first end of the valve head (3) along the second direction, and the first filter bottle (20) is provided with a first filter element inside; The second filter bottle (4) is connected to the second end of the valve head (3) along the second direction. The second filter bottle (4) is provided with a second filter element and an adapter (7) inside. The adapter (7) is located inside the second filter element. An embedded component (8) is provided inside the valve head (3) and has a raw water chamber (801), a filtered water chamber (802) and a purified water chamber (804). The raw water chamber (801) and the purified water chamber (804) are respectively located on both sides of the filtered water chamber (802) along the first direction, so that water enters the first filter bottle (20) from one end of the valve head (3) along the first direction through the raw water chamber (801), is filtered by the first filter element, and then enters the second filter bottle (4) through the filtered water chamber (802) and the adapter (7) in sequence. After being filtered by the second filter element, it is guided by the purified water chamber (804) to the other end of the valve head (3) along the first direction for discharge.

2. The prefilter of claim 1, wherein, The pre-filter also includes: The water distributor (10) is fixed in the first filter bottle (20) and is used to receive the water guided through the original water chamber (801); A switching element (11) is movably connected to the insert (8) and docks with the filter water chamber (802) for moving relative to the insert (8) in a second direction and between a first position and a second position, so as to open the flow channel of the water distributor (10) into the first filter bottle (20) in the first position and close the flow channel of the water distributor (10) into the first filter bottle (20) in the second position.

3. The prefilter of claim 2, wherein, The pre-filter also includes: Connector (18) is connected to the switching element (11); An impeller assembly (15) is connected to the connector (18), and the impeller assembly (15) is configured to drive the connector (18) and the switching member (11) to move in a second direction under the driving action of water flow.

4. The pre-filter as described in claim 3, characterized in that, The first filter element includes a first frame (13) and a first filter screen disposed on the first frame (13); The pre-filter also includes: The scraping assembly (14) is located on the outer periphery of the first frame (13) and is connected to the impeller assembly (15); The scraping condition (19) is installed on the scraping assembly (14) and is used to scrape the outer surface of the first filter screen and the inner surface of the first filter bottle (20).

5. The prefilter of claim 4, wherein, The pre-filter also includes: A sealing element (16) is installed at the end of the first filter bottle (20) away from the second filter bottle (4) and is provided with a horn rib. The horn rib is used to drive the impeller assembly (15) and the scraping assembly (14) to rotate. A ball valve (17) is connected to the seal (16) and is equipped with a switch for controlling sewage discharge.

6. The pre-filter as described in claim 4, characterized in that, The pre-filter also includes an elastic element (12) that abuts against the switching element (11) and the first frame (13). The elastic element (12) is used to provide an elastic force to the switching element (11) so that the switching element (11) has a tendency to move from the second position to the first position.

7. The prefilter of claim 2, wherein The insert (8) is also provided with a backwash chamber (803), which is located on the outer periphery of the filter water chamber (802). When the switching member (11) is in the second position, the water that enters the original water chamber (801) from one end of the valve head (3) along the first direction can enter between the second filter element and the adapter (7) through the backwash chamber (803) to backwash the second filter element.

8. The prefilter of claim 7, wherein, The adapter (7) is provided with an adapter cavity (702), which is used to guide the water filtered by the first filter element to the second filter bottle (4), and also to guide the water after backwashing the second filter element to the interior of the first filter element so as to backwash the first filter element. The outer wall of the adapter (7) is provided with a flow guiding structure, which is used to guide the water filtered by the second filter element to the water purification chamber (804).

9. The prefilter of claim 3, wherein, The switching element (11) includes: The docking end (1101) docks with the embedded part (8); The connecting end (1105) is provided with an external thread for threaded connection with the connecting piece (18); An annular protrusion (1103) is provided between the docking end (1101) and the connecting end (1105) for contacting and abutting against the water distributor (10) to close the flow channel of the water distributor (10) into the first filter bottle (20).

10. The pre-filter as described in any one of claims 1-9, characterized in that, The pre-filter also includes: A pressure gauge is installed on the valve head (3) to detect the pressure inside the valve head (3); The display is connected to the pressure gauge signal and is used to display the pressure inside the valve head (3).

Images