An inverted filter pre-filter
Patent Information
- Application Number
- CN202522270896.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-27
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-10-27
AI Technical Summary
The filter bottle of existing pre-filters is usually located at the lower end of the valve head, which makes it impossible to install and use them properly in some homes with narrow installation spaces, and also makes sewage discharge inconvenient.
The filter bottle is placed on the upper side of the valve head and connected to the drain space through the drain pipe. The connection status of the filter component is controlled by pressure changes to achieve filtration and backwashing functions and ensure the effective discharge of impurities.
Even when the filter bottle is inverted, it still has filtration and backwashing functions to ensure effective removal of impurities and adapt to the needs of different installation locations.
Smart Images
Figure CN224925752U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of filter technology, and in particular to an inverted filter bottle pre-filter. Background Technology
[0002] The city's water supply pipelines are old and long, and rust, silt, and other impurities can cause water-using equipment to malfunction. Therefore, pre-filters are needed on these water-using devices. Pre-filters are typically installed after the water meter, and their main function is to restore the tap water to its pre-treatment standard, protecting downstream equipment.
[0003] Impurities are affected by gravity, so the filter bottle of existing pre-filters is usually located at the lower end of the valve head, and the drain port is located at the bottom of the filter bottle. However, the structure of the filter element assembly, drain valve, drain pipe and other components inside the filter bottle will cause the pre-filter to extend downwards for a long time. In some homes with narrow installation spaces, it cannot be installed and used correctly. Some users install it at an angle or even horizontally, which will cause dirt to be unable to be discharged smoothly.
[0004] Therefore, in view of the above-mentioned technical problems, how to design a pre-filter that places the filter bottle on top and does not affect the sewage discharge is a technical problem that needs to be solved by those skilled in the art. Utility Model Content
[0005] The purpose of this application is to provide an inverted filter bottle pre-filter, in which the filter bottle and filter assembly are set as a whole on the upper side of the valve head. At the same time, since the discharge of impurities is affected by gravity, the discharge port is still set on the lower side of the valve head to ensure the discharge effect of impurities.
[0006] To achieve the above objectives, this application provides an inverted filter bottle pre-filter, comprising:
[0007] A valve head includes an inlet and an outlet, wherein the valve head is provided with an opening structure communicating with the inlet;
[0008] A filter bottle is located above the valve head, and the lower end of the filter bottle is sealed and connected to the opening structure; the filter bottle has a filtration space and a drain space located above the filtration space, the filtration space is connected to the water inlet, and the drain space is connected to the filtration space;
[0009] A filter assembly is movably disposed in the filter space. The filter assembly connects the filter space and the water outlet. The movable filter assembly is used to change the connection state between the filter space and the water inlet. In the first connection state, the raw water from the water inlet flows from the filter space to the filter assembly. In the second connection state, the raw water from the water inlet flows from the filter assembly to the filter space.
[0010] The drain pipe has one end connected to the drain space and the other end extending downwards and connecting to a control valve after sealing through the valve head.
[0011] Optionally, the filter bottle is provided with a water distributor and a pressure cap movably disposed on the upper side of the water distributor. The water distributor and the pressure cap divide the interior of the filter bottle into: a sewage discharge space located between the filter bottle and the pressure cap, and a filtration space located between the pressure cap and the water distributor.
[0012] The outer ring of the water distributor is sealed against the inner wall of the filter bottle, and a first through hole is provided between the inner and outer rings of the water distributor, the first through hole connecting the filtration space and the water inlet;
[0013] The outer ring of the pressure cap slides and seals against the inner wall of the filter bottle. A second through hole is provided between the inner and outer rings of the pressure cap, and the second through hole connects the filtration space and the sewage discharge space.
[0014] Optionally, the filter assembly includes an inner frame, one end of which is fixedly connected to the pressure cap, and the other end is slidably and sealingly inserted into the inner ring of the water distributor and extends downward into the water outlet. The inner frame has an inner cavity that communicates the filter space and the water outlet.
[0015] Optionally, a water-blocking ring is provided on the inner frame on the lower side of the water distributor. The water-blocking ring corresponds to the first through hole in the vertical position. In the first connected state, the water-blocking ring is spaced apart from the first through hole so as to connect the filter space and the water inlet through the first through hole. In the second connected state, the water-blocking ring seals against the first through hole to shut off the first through hole.
[0016] The inner frame is provided with a backwash channel. The first end of the backwash channel is located below the water baffle ring, and the second end is located between the water distributor and the pressure cap. In the first connected state, the first end of the backwash channel is sealed and abuts against the inner wall of the water outlet. In the second connected state, the first end of the backwash channel is disengaged from the water outlet and connected to the water inlet.
[0017] Optionally, the upper end of the inner frame is provided with a buckle, and the lower side of the pressure cover is provided with a groove that rotates and engages with the buckle.
[0018] Optionally, the filter assembly includes a plurality of stacked plates sleeved on the outer periphery of the inner frame, and the stacked plates arranged regularly or irregularly form a filter screen with a preset pore size, with the stacked plate located at the bottom abutting against the water distributor.
[0019] In the first connected state, the pressure cap presses against the uppermost stacked piece; in the second connected state, the pressure cap disengages from the uppermost stacked piece.
[0020] Optionally, a return spring is provided between the upper side of the cap and the upper wall of the filter bottle. The return spring has an initial compression amount and is used to provide an elastic force for the cap to press the stacked sheets together.
[0021] Optionally, the first end of the backwash channel is provided with a backwash screen, and the water outlet direction of the second end of the backwash channel is opposite to the radial direction of the stacked plates, so as to generate a backwash water flow that drives the stacked plates to rotate.
[0022] Optionally, the drain pipe is slidably sealed to the inner ring of the gland, and the drain pipe is slidably sealed to the inner skeleton, and the drain pipe extends downward and sequentially penetrates the inner cavity of the inner skeleton, the outlet, and the pipe wall of the valve head.
[0023] Optionally, the inner wall of the valve head is provided with a lead separator, and the filter bottle is sealed with a pressure gauge for detecting the internal pressure of the filter bottle.
[0024] The beneficial effect of this application lies in the fact that the filter bottle is positioned above the valve head. By opening or closing the drain pipe, the pressure in the drain space inside the filter bottle changes. The filter assembly moves under the pressure change, thereby altering the connection between the filter space and the inlet. In the first connection state, the raw water from the inlet flows from the filter space to the filter assembly, achieving filtration. In the second connection state, the raw water from the inlet flows from the filter assembly to the filter space, achieving backwashing. It can be seen that the pre-filter of this application still has filtration and backwashing functions even when the filter bottle is inverted. Furthermore, the drain pipe connects to the drain space, extending downwards and sealingly penetrating to the lower side of the valve head, ensuring that the drain outlet remains located below the valve head, guaranteeing effective impurity removal. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the inverted filter bottle pre-filter structure provided in an embodiment of this application;
[0027] Figure 2 This is a schematic diagram of the valve head structure provided in an embodiment of this application;
[0028] Figure 3 This is a schematic diagram of the internal skeleton structure provided in the embodiments of this application;
[0029] Figure 4 This is a schematic diagram of the internal skeleton provided in an embodiment of this application from another perspective;
[0030] Figure 5 This is a schematic diagram of the water distributor structure provided in an embodiment of this application;
[0031] Figure 6 This is a schematic diagram of the gland structure provided in an embodiment of this application;
[0032] Figure 7 This is a schematic diagram of the overlay structure from another perspective, provided in an embodiment of this application.
[0033] Figure 8 A schematic diagram of the inverted filter bottle pre-filter in the filtration state provided in the embodiments of this application;
[0034] Figure 9 This is a schematic diagram of the inverted filter bottle pre-filter provided in the embodiment of this application in the backwashing state.
[0035] In the diagram: 1-Valve head; 2-Filter bottle; 3-Inner frame; 4-Water distributor; 5-Disc plate; 6-Cap; 7-Pressure gauge; 8-Reset spring; 9-Control valve; 10-Drain pipe;
[0036] 11-Inlet; 12-Outlet; 13-Open structure; 111-Raw water chamber; 121-Clean water chamber;
[0037] 21-Filtration space; 22-Sewage discharge space;
[0038] 31-Inner cavity; 32-Water baffle ring; 33-Backwash channel; 34-Snap fastener; 331-First end; 332-Second end;
[0039] 41-First through hole; 42-Rib;
[0040] 61-Slot; 62-Limiting slot; 63-Second through hole. Detailed Implementation
[0041] 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.
[0042] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0043] 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.
[0044] like Figure 1 As shown, in this embodiment, an inverted filter bottle pre-filter is provided. The pre-filter includes a valve head 1, a filter bottle 2, a filter assembly and a drain pipe 10. The valve head 1 is a metal corrosion-resistant structure. The two sides of the valve head 1 are an inlet 11 and an outlet 12, respectively. The diameter of the inlet 11 can be equal to the diameter of the outlet 12.
[0045] Please refer to Figure 2 The valve head 1 has an internally threaded opening structure 13 that communicates with the inlet 11. After the raw water enters the valve head 1 through the inlet 11, it first enters the raw water chamber 111, which is an annular cavity structure. After passing through the raw water chamber 111, the raw water reaches the opening structure 13. The outlet 12 has a purified water chamber 121, which is located in the raw water chamber 111 and the two are coaxially arranged. However, the purified water chamber 121 and the raw water chamber 111 are not directly connected to each other to prevent the raw water from being discharged from the outlet 12 without filtration.
[0046] The filter bottle 2 is located on the upper side of the valve head 1, and the lower end of the filter bottle 2 is sealed and connected to the opening structure 13. For example, the lower end of the filter bottle 2 is provided with an external thread structure. The filter bottle 2 and the valve head 1 are fixedly connected through the thread structure, and a sealing ring is added at the thread structure to achieve a sealed connection between the filter bottle 2 and the valve head 1.
[0047] Please refer to Figure 1 The filter bottle 2 has a filtration space 21 and a drain space 22 located on the upper side of the filtration space 21. The filtration space 21 is connected to the water inlet 11, so that the raw water in the raw water chamber 111 can enter the filtration space 21. The drain space 22 is connected to the filtration space 21, so that the impurities in the filtration space 21 can be flushed into the drain space 22.
[0048] The filter assembly is movably installed in the filter space 21. The filter assembly can connect the filter space 21 and the water outlet 12, so that the raw water in the filter space 21 can be filtered by the filter assembly and discharged to the water outlet 12 through the water purification chamber 121.
[0049] The movable filter component can be used to change the connection state between the filter space 21 and the inlet 11. In the first connection state, the raw water flows from the filter space 21 to the filter component to achieve the filtration of the raw water. In the second connection state, the raw water from the inlet 11 flows from the filter component to the filter space 21, thereby backwashing the filter component with the raw water to remove impurities. The impurities then enter the sewage discharge space 22.
[0050] One end of the drain pipe 10 is connected to the drain space 22, and the other end extends downward and seals through the valve head 1 before being connected to the control valve 9. When the control valve 9 is opened, the drain pipe 10 is opened, and impurities in the drain space 22 can be discharged downward through the drain pipe 10 to the filter bottle 2 and the valve head 1.
[0051] In summary, this application places the filter bottle 2 on the upper side of the valve head 1. By opening or closing the drain pipe 10, the pressure in the drain space 22 inside the filter bottle 2 changes. The filter assembly moves under the pressure change, thereby changing the communication state between the filter space 21 and the inlet 11. In the first communication state, the raw water in the inlet 11 flows from the filter space 21 to the filter assembly, achieving filtration. In the second communication state, the raw water in the inlet 11 flows from the filter assembly to the filter space 21, achieving backwashing. It can be seen that the pre-filter of this application still has filtration and backwashing functions even when the filter bottle 2 is inverted. At the same time, this application connects the drain space 22 through the drain pipe 10, which extends downward and seals through to the lower side of the valve head 1, ensuring that the drain outlet is still located on the lower side of the valve head 1, thus ensuring the discharge effect of impurities.
[0052] In some embodiments, a water distributor 4 and a pressure rod movably disposed on the upper side of the water distributor 4 are provided in the filter bottle 2. The water distributor 4 and the pressure cap 6 divide the interior of the filter bottle 2 into: a sewage discharge space 22 located between the filter bottle 2 and the pressure cap 6, and a filtration space 21 located between the pressure cap 6 and the water distributor 4. The filter assembly is fixedly disposed on the pressure cap 6 and located in the filtration space 21. The filter assembly can move up and down with the pressure cap 6, thereby changing the communication state between the filtration space 21 and the water inlet 11.
[0053] The outer ring of the water distributor 4 is in sealed contact with the inner wall of the filter bottle 2. Please refer to [reference needed]. Figure 5 Multiple ribs 42 can be provided on the outer ring of the water distributor 4. The ribs 42 and the grooves on the inner wall of the filter bottle 2 are engaged to achieve the two. A first through hole 41 is provided between the inner ring and the outer ring of the water distributor 4. When the first through hole 41 connects the filtration space 21 and the water inlet 11, it is in the first connected state. At this time, the raw water from the water inlet 11 enters the filtration space 21 through the raw water chamber 111 and the first through hole 41. After being filtered by the filtration component, it reaches the water outlet 12 through the clean water chamber 121.
[0054] The outer ring of the cap 6 slides and seals against the inner wall of the filter bottle 2. A second through hole 63 is provided between the inner and outer rings of the cap 6. Please refer to [reference needed]. Figure 7 The second through hole 63 connects the filter space 21 and the drain space 22. It should be noted that only when the control valve 9 is opened and the drain pipe 10 discharges sewage to the outside, the drain space 22 is depressurized, allowing water in the filter space 21 to flow into the drain space 22; when the control valve 9 is closed and the drain pipe 10 is shut off, water in the filter space 21 will not flow into the drain space 22.
[0055] In some embodiments, the filter assembly includes an inner frame 3, one end of which is fixedly connected to the pressure cap 6, and the other end is slidably and sealingly inserted into the inner ring of the water distributor 4 and extends downward into the outlet 12, specifically into the water purification chamber 121. The inner frame 3 has an inner cavity 31 that connects the filter space 21 and the outlet 12, thereby ensuring that the raw water in the filter space 21 passes through the filter port of the filter assembly and can completely enter the water purification chamber 121 through the inner cavity 31, and then be discharged from the outlet 12.
[0056] Please refer to Figure 3 and Figure 4 A water-blocking ring 32 is provided on the inner frame 3 on the lower side of the water distributor 4. The water-blocking ring 32 corresponds to the first through hole 41 in a vertical position. In the first connected state, the water-blocking ring 32 and the first through hole 41 have a certain distance, so that the raw water chamber 111 can be connected to the filter space 21 through the first through hole 41. In the second connected state, the water-blocking ring 32 and the first through hole 41 are sealed and abutted, thereby closing the first through hole 41. A sealing sleeve can be fitted on the water-blocking ring 32 to ensure the sealing effect between the water-blocking ring 32 and the first through hole 41.
[0057] Please refer to Figure 3 A backwashing channel 33 is provided on the inner frame 3. The first end 331 of the backwashing channel 33 is located below the water baffle ring 32, and the second end 332 is located between the water distributor 4 and the pressure cap 6. In the first connected state, the first end 331 of the backwashing channel 33 is sealed and abutted against the inner wall of the outlet 12. At this time, the backwashing channel 33 is closed, and the raw water in the raw water chamber 111 can only enter the filter space 21 through the first through hole 41. In the second connected state, the first end 331 of the backwashing channel 33 is dislodged from the raw water chamber 111, so that the backwashing channel 33 is opened, and the raw water can enter the filter space 21 through the backwashing channel 33.
[0058] As can be seen, in the first connected state, the raw water in the raw water chamber 111 can only enter the filter space 21 through the first through hole 41. At this time, the raw water will flow from the filter space 21 to the filter assembly to achieve the filtration function. In the second connected state, the raw water in the raw water chamber 111 can only enter the filter space 21 through the backwash channel 33. At this time, the raw water will flow from the filter assembly to the filter space 21 to achieve the backwash function.
[0059] Please refer to Figure 8 When the control valve 9 is closed, the pressure in the drain space 22 and the filter space 21 remains balanced, the pressure cap 6 is in the initial position at the bottom, the first end 331 of the backwash channel 33 is closed, and the first through hole 41 is opened. At this time, it is in the first connected state. The raw water in the raw water chamber 111 flows through the first through hole 41, the filter space 21, the filter assembly, and the clean water chamber 121 in sequence, and is finally discharged from the outlet 12.
[0060] Please refer to Figure 9 When control valve 9 is opened, the pressure in the drain space 22 decreases, and the water pressure in the filter space 21 pushes the pressure cap 6 upward, which in turn moves the inner frame 3 upward. This causes the first end 331 of the backwash channel 33 to gradually open until the water baffle ring 32 seals against the first through hole 41. At this point, the pressure cap 6 stops moving, and the system is in the second connected state. The raw water in the raw water chamber 111 flows sequentially through the backwash channel 33, the filter assembly, the filter space 21, the second through hole 63, the drain space 22, and the drain pipe 10, finally flowing out through control valve 9. In the second connected state, when the raw water flows from the filter assembly to the filter space 21, it can wash away impurities on the filter assembly, thereby achieving backwashing and draining.
[0061] When the control valve 9 switches from the open state to the closed state, the pressure in the drain space 22 gradually returns to the initial state, causing the pressure cap 6 to move downward to the initial position, thereby opening the first through hole 41 again and gradually closing the first end 331 of the backwash channel 33, realizing the switch from the second connection state to the first connection state, that is, the switch from the backwash state to the filtration state.
[0062] Please refer to Figure 3 and Figure 6 The inner frame 3 has a buckle 34 at the upper end, and the pressure cover 6 has a slot 61 on the lower side that rotates and engages with the buckle 34, so as to realize the detachable and fixed connection between the inner frame 3 and the pressure cover 6.
[0063] It should be noted that in this embodiment, the sealing connection (including static seal and sliding seal) can be in the form of a sealing ring.
[0064] The filter assembly includes several stacked plates 5 fitted around the outer periphery of the inner frame 3. Multiple regularly or irregularly arranged stacked plates 5 form a filter screen with a specific pore size, capable of filtering fine particles. The lowermost stacked plate 5 abuts against the water distributor 4. In the first connected state, the pressure cap 6 can press the uppermost stacked plate 5 tightly, causing the entire stacked plate 5 to be in a compressed and contracted state, achieving raw water filtration. In the second connected state, as the pressure cap 6 moves upward, it disengages from the uppermost stacked plate 5, causing the stacked plate 5 to loosen. Water then flows rapidly in the reverse direction from the backwash channel 33, flushing the stacked plate 5 and removing impurities.
[0065] In addition, a return spring 8 is provided between the upper side of the cap 6 and the upper wall of the filter bottle 2. The return spring 8 has an initial compression amount and can be stably engaged in the limiting groove 62 on the upper side of the cap 6. The return spring 8 provides the cap 6 with the elastic force to press the stacked pieces 5.
[0066] A backwashing screen is provided at the first end 331 of the backwashing channel 33 to filter the backwashing water flow; the water outlet direction of the second end 332 of the backwashing channel 33 is set radially with the stacked plates 5, thereby generating a backwashing water flow that drives the stacked plates 5 to rotate, improving the effect of the stacked plates 5 rotating and throwing away impurities.
[0067] Furthermore, the drain pipe 10 is fixedly installed as a whole, and the drain pipe 10 slides and seals with the inner ring of the gland 6, and slides and seals with the inner frame 3. The drain pipe 10 can be fixedly sealed with the valve head 1 through a sealing element. The drain pipe 10 extends downward and sequentially passes through the inner cavity 31 of the inner frame 3, the outlet 12 and the pipe wall of the valve head 1. In some embodiments, the control valve 9 can be a ball valve.
[0068] A lead separator is also provided on the inner wall of the valve head 1. The lead separator is made of plastic and is injection molded inside the metal valve head 1 to prevent the leaching of heavy metals. A pressure gauge 7 is sealed on the filter bottle 2 to detect the internal pressure of the filter bottle 2, so that the user can know the internal pressure status and react in time.
[0069] 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.
[0070] This document uses specific examples 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 method 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 the claims of this application.
Claims
1. A pre-filter with an inverted filter bottle, characterized in that, include: The valve head (1) includes an inlet (11) and an outlet (12), and the valve head (1) is provided with an opening structure (13) communicating with the inlet (11). The filter bottle (2) is located on the upper side of the valve head (1), and the lower end of the filter bottle (2) is sealed and connected to the opening structure (13); the filter bottle (2) has a filtration space (21) and a sewage discharge space (22) located on the upper side of the filtration space (21), the filtration space (21) is connected to the water inlet (11), and the sewage discharge space (22) is connected to the filtration space (21); A filter assembly is movably disposed in the filter space (21). The filter assembly connects the filter space (21) and the outlet (12). The movable filter assembly is used to change the connection state between the filter space (21) and the inlet (11). In the first connection state, the raw water from the inlet (11) flows from the filter space (21) to the filter assembly. In the second connection state, the raw water from the inlet (11) flows from the filter assembly to the filter space (21). The drain pipe (10) is connected at one end to the drain space (22) and at the other end extends downward and is connected to the control valve (9) after sealing through the valve head (1).
2. The inverted filter bottle pre-filter according to claim 1, characterized in that, The filter bottle (2) is provided with a water distributor (4) and a pressure cap (6) movably disposed on the upper side of the water distributor (4). The water distributor (4) and the pressure cap (6) divide the interior of the filter bottle (2) into: a sewage discharge space (22) located between the filter bottle (2) and the pressure cap (6) and a filtration space (21) located between the pressure cap (6) and the water distributor (4). The outer ring of the water distributor (4) is sealed against the inner wall of the filter bottle (2). A first through hole (41) is provided between the inner ring and the outer ring of the water distributor (4). The first through hole (41) connects the filter space (21) and the water inlet (11). The outer ring of the cap (6) slides and seals with the inner wall of the filter bottle (2). A second through hole (63) is provided between the inner and outer rings of the cap (6). The second through hole (63) connects the filtration space (21) and the sewage discharge space (22).
3. The inverted filter bottle pre-filter according to claim 2, characterized in that, The filter assembly includes an inner frame (3), one end of which is fixedly connected to the pressure cap (6), and the other end is slidably and sealingly inserted into the inner ring of the water distributor (4) and extends downward into the outlet (12). The inner frame (3) has an inner cavity (31) that connects the filter space (21) and the outlet (12).
4. The inverted filter bottle pre-filter according to claim 3, characterized in that, A water-blocking ring (32) is provided on the inner frame (3) on the lower side of the water distributor (4). The water-blocking ring (32) corresponds to the first through hole (41) in the vertical position. In the first connected state, the water-blocking ring (32) and the first through hole (41) are spaced apart to connect the filter space (21) and the water inlet (11) through the first through hole (41). In the second connected state, the water-blocking ring (32) seals against the first through hole (41) to close the first through hole (41). The inner frame (3) is provided with a backwash channel (33). The first end (331) of the backwash channel (33) is located below the water baffle ring (32), and the second end (332) is located between the water distributor (4) and the pressure cap (6). In the first connected state, the first end (331) of the backwash channel (33) is sealed and abutted against the inner wall of the outlet (12). In the second connected state, the first end (331) of the backwash channel (33) is dislodged from the outlet (12) and connected to the inlet (11).
5. The inverted filter bottle pre-filter according to claim 3, characterized in that, The upper end of the inner frame (3) is provided with a buckle (34), and the lower side of the pressure cover (6) is provided with a groove (61) that rotates and engages with the buckle (34).
6. The inverted filter bottle pre-filter according to claim 4, characterized in that, The filter assembly includes several stacked plates (5) sleeved on the outer periphery of the inner frame (3). The stacked plates (5) arranged regularly or irregularly form a filter screen with a preset pore size. The stacked plate (5) located at the bottom abuts against the water distributor (4). In the first connected state, the pressure cap (6) presses against the uppermost stacked piece (5); in the second connected state, the pressure cap (6) disengages from the uppermost stacked piece (5).
7. The inverted filter bottle pre-filter according to claim 6, characterized in that, A return spring (8) is provided between the upper side of the cap (6) and the upper wall of the filter bottle (2). The return spring (8) has an initial compression amount and is used to provide the cap (6) with an elastic force to press the stacked pieces (5).
8. The inverted filter bottle pre-filter according to claim 6, characterized in that, The first end (331) of the backwash channel (33) is provided with a backwash net, and the water outlet direction of the second end (332) of the backwash channel (33) is opposite to the radial direction of the stack (5) to generate a backwash water flow that drives the stack (5) to rotate.
9. The inverted filter bottle pre-filter according to claim 3, characterized in that, The drain pipe (10) slides and seals with the inner ring of the cap (6), the drain pipe (10) slides and seals with the inner frame (3), and the drain pipe (10) extends downward and passes through the inner cavity (31) of the inner frame (3), the outlet (12), and the pipe wall of the valve head (1) in sequence.
10. The inverted filter bottle pre-filter according to any one of claims 1-9, characterized in that, The valve head (1) has a lead separator on its inner wall, and the filter bottle (2) is sealed with a pressure gauge (7) for detecting the internal pressure of the filter bottle (2).