Pre-filter of double-filtering system

Abstract

The utility model discloses a pre-filter with double filter systems, which relates to the technical field of purification equipment and comprises a valve body, a lower filter bottle, a first filter component, an upper filter bottle and a second filter component, the lower filter bottle and the upper filter bottle are connected with the valve body, the first filter component is arranged in the lower filter bottle, and a first filter cavity is formed between the first filter component and the lower filter bottle; the first filtering cavity is communicated with an inner cavity of the first filtering assembly; the second filtering assembly is arranged in the upper filtering bottle, and a second filtering cavity is formed between the second filtering assembly and the upper filtering bottle and is communicated with the inner cavity of the second filtering assembly. According to the pre-filter with the double filtering systems, first-layer filtering is carried out through the lamination in the cavity of the lower filtering bottle, second-layer filtering is carried out through the filtering net in the cavity of the upper filtering bottle, enough filtering working gaps are guaranteed, the filtering effect is good, the liquid flux is large, and the pre-filter is suitable for filtering water in different environments; when the switching piece moves downwards, back flushing is carried out, impurities on the lamination and the filter screen are flushed and discharged, sewage is discharged cleanly and thoroughly, and the service life of the filter is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of purification equipment, and particularly relates to a pre-filter with a double filtration system. Background Art

[0002] A pre-filter is a kind of filtration equipment on the whole-house pipeline, which can filter rust, sediment, impurities, etc. in tap water to ensure the cleanliness of water quality. At present, generally only one filtration system is set in the pre-filter, and its filtration effect is not good, making it difficult to adapt to water quality in different environments.

[0003] To ensure the filtration effect, in the existing pre-filter with double filters, two filters are installed on the inner and outer sides of the skeleton in one filter bottle for two-stage filtration. When discharging sewage, the surface of the outer filter is rinsed to achieve the effect of cleaning and sewage discharge. However, with the increase of the use time of the existing pre-filter with double filters, more and more impurities accumulate between the inner and outer filters, and it is not easy to drain the impurities completely, resulting in a blocking phenomenon. As a result, the liquid flux decreases, leading to a reduction in the water output at the rear end, which not only affects household water use but also shortens the service life of the pre-filter. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a pre-filter with a double filtration system, which solves the technical problems that impurities in the existing pre-filter with double filters are not easy to be drained completely, resulting in a blocking phenomenon, affecting household water use and service life.

[0005] To achieve the above purpose, the utility model provides a pre-filter with a double filtration system, including:

[0006] A valve body;

[0007] A lower filter bottle, connected to the valve body;

[0008] A first filtration component, arranged in the lower filter bottle and forming a first filtration chamber therebetween, and the first filtration chamber is communicated with the inner chamber of the first filtration component;

[0009] An upper filter bottle, connected to the valve body;

[0010] A second filtration component, arranged in the upper filter bottle and forming a second filtration chamber therebetween, and the second filtration chamber is communicated with the inner chamber of the second filtration component.

[0011] Preferably, a connecting member is arranged in the valve body, and the connecting member is provided with a first water inlet chamber, a second water inlet chamber, a third water inlet chamber, a fourth water inlet chamber and a cavity hole. Among them,

[0012] The first water inlet chamber is communicated with the water inlet end of the valve body and the first filtration chamber;

[0013] The second water inlet chamber communicates with the third water inlet chamber, and the cavity hole communicates with the first water inlet chamber;

[0014] The third water inlet chamber communicates with the inner chamber of the first filter assembly and the second filter chamber;

[0015] The fourth water inlet chamber communicates with the water outlet end of the valve body.

[0016] Preferably, the first filter assembly includes:

[0017] A lower skeleton;

[0018] A stack plate assembly, including a plurality of stack plates sleeved outside the lower skeleton;

[0019] An outer turbine, rotatably arranged at the upper end of the stack plate assembly;

[0020] A lower water distributor, connected to the lower skeleton and arranged at the top of the first filter chamber.

[0021] Preferably, it further includes a switching assembly. The switching assembly is movably arranged inside the first filter assembly and its top extends into the valve body. The switching assembly includes:

[0022] A switching member, movably arranged inside the lower skeleton;

[0023] A top cover, connected to the switching member, arranged at the second water inlet chamber, and the top of the top cover extends into the cavity hole;

[0024] A rotating seat, sleeved outside the switching member;

[0025] An elastic member, arranged between the lower skeleton and the rotating seat. One end of the elastic member abuts against the bottom of the rotating seat, and the other end of the elastic member abuts against the lower skeleton;

[0026] A piston, arranged at the bottom of the switching member, and the bottom of the switching member is sleeved inside the piston.

[0027] Preferably, the first filter assembly further includes an inner turbine. The inner turbine is sleeved outside the switching member and is supported on the rotating seat.

[0028] Preferably, the second filter assembly includes:

[0029] An upper skeleton;

[0030] A scraping member, arranged outside the upper skeleton, and a plurality of brushes are arranged on the scraping member;

[0031] A filter screen, arranged between the scraping member and the upper skeleton;

[0032] The upper water divider is connected to the upper framework and is arranged at the bottom of the second filtering chamber.

[0033] Preferably, a seal and a fixing member are further arranged at the bottom of the lower filter bottle. The seal is located at the lower end of the first filtering component. The fixing member is connected to the lower filter bottle, and the seal is threadedly connected to the fixing member.

[0034] Preferably, a ball valve is further included, which is arranged at the bottom of the lower filter bottle and is fixedly threadedly connected to the fixing member. When the ball valve is closed, the pre-filter of the double-filtering system is in the filtering state; when the ball valve is opened, it can drive the switching member to move downward, so that the first water inlet chamber is communicated with the fourth water inlet chamber, and the pre-filter of the double-filtering system is in the flushing state.

[0035] Preferably, an upper support and a lower support are further arranged in the lower filter bottle. The bottom of the upper support abuts against the top of the stack disc assembly. The outer turbine is sleeved outside the upper support. The top of the lower support abuts against the bottom of the stack disc assembly. The bottom of the lower support abuts against the piston.

[0036] Preferably, an adapter is further included. The lower end of the adapter is hermetically connected to the fourth water inlet chamber, and the upper end of the adapter is hermetically connected to the bottom end of the upper framework.

[0037] Compared with the above-mentioned background art, the pre-filter of the double-filtering system provided by the present utility model filters through the stack discs in the lower filter bottle cavity for the first layer, and then filters through the filter screen in the upper filter bottle cavity for the second layer, ensuring sufficient filtering working clearance, resulting in good filtering effect and large liquid throughput, and being applicable to filtering water quality in different environments; when the switching member moves downward, the water flow is reversely flushed, and the impurities on the stack discs and the filter screen are washed away and discharged, with thorough sewage discharge, which can effectively improve the service life of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0039] Figure 1 It is a cross-sectional view of the pre-filter of the double-filtering system provided by the embodiment of the present utility model;

[0040] Figure 2 It is a schematic diagram of the filtering state of the pre-filter of the double-filtering system provided by the present utility model;

[0041] Figure 3Schematic diagram of the flushing state of the pre-filter of the dual-filter system provided by the present utility model;

[0042] Figure 4 Schematic diagram of the structure of the valve body provided by the present utility model;

[0043] Figure 5 Schematic cross-sectional structure diagram of the connecting member provided by the present utility model;

[0044] Figure 6 Top view schematic diagram of the connecting member provided by the present utility model;

[0045] Figure 7 Schematic diagram of the structure of the switching member provided by the present utility model;

[0046] Figure 8 Schematic diagram of the structure of the lower water distributor provided by the present utility model;

[0047] Figure 9 Schematic diagram of the structure of the top cover provided by the present utility model;

[0048] Figure 10 Schematic diagram of the structure of the lower skeleton provided by the present utility model;

[0049] Figure 11 Schematic diagram of the structure of the piston provided by the present utility model;

[0050] Figure 12 Schematic diagram of the structure of the scraping and washing member provided by the present utility model.

[0051] Figures 1 to 12 In the drawings, reference numerals: 1, valve body; 101, water inlet end; 102, water outlet end; 2, connecting member; 201, first water inlet cavity; 202, second water inlet cavity; 203, third water inlet cavity; 204, fourth water inlet cavity; 205, cavity hole; 3, top cover; 301, second annular groove; 302, first limiting portion; 4, switching member; 401, third annular groove; 402, limiting convex ring; 403, threaded portion; 5, lower water distributor; 501, convex block; 502, water distribution blade; 503, buckle; 6, stack of sheets; 7, lower filter bottle; 8, lower support; 9, piston; 901, fourth annular groove; 902, reserved drain port; 10, seal; 11, fixing member; 12, ball valve; 13, lower skeleton; 131, first water passing hole; 132, first sealing groove; 14, elastic member; 15, swivel base; 16, inner turbine; 17, upper support; 18, outer turbine; 19, adapter; 20, upper water distributor; 21, upper skeleton; 22, filter screen; 23, gland; 24, buffer member; 25, scraping and washing member; 251, brush; 26, upper filter bottle; 27, first filter cavity; 28, second filter cavity. Detailed implementation manners

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0053] In order to enable those skilled in the art of this technology to better understand the solution of the present utility model, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] The present utility model provides a pre-filter for a double filtration system. The raw water first passes through the inside of the lower filter bottle 7 and is filtered for the first time by the stack discs 6, and then flows through the inside of the upper filter bottle 26 and is filtered for the second time by the filter screen 22, ensuring sufficient filtration working intervals, resulting in good filtration effect, large liquid throughput, thorough backwashing and sewage discharge, and effectively improving the service life of the filter.

[0055] Please refer to Figures 1 to 3 together. The pre-filter for the double filtration system provided by the present utility model includes a valve body 1, an upper filter bottle 26, a lower filter bottle 7, a first filtration component, and a second filtration component.

[0056] The valve body 1 is connected to the upper filter bottle 26 and the lower filter bottle 7. The first filtration component is arranged inside the lower filter bottle 7, and a first filtration chamber 27 is formed between them. The first filtration chamber 27 is communicated with the inner chamber inside the first filtration component; the second filtration component is arranged inside the upper filter bottle 26, and a second filtration chamber 28 is formed between them. The second filtration chamber 28 is communicated with the inner chamber inside the second filtration component. Two-stage filtration is carried out through the first filtration component and the second filtration component to ensure the filtration effect.

[0057] Please refer to Figure 1 and Figure 4 together. In this embodiment, the valve body 1 is a four-way valve. The valve body 1 is provided with a water inlet end 101 and a water outlet end 102. Among them, the left end of the valve body 1 is the water inlet end 101, and the right end of the valve body 1 is the water outlet end 102. The upper end of the valve body 1 is threadedly connected to the upper filter bottle 26, and the lower end of the valve body 1 is threadedly connected to the lower filter bottle 7.

[0058] The water inlet end 101 and the water outlet end 102 correspond to the inlet and outlet of the liquid filtered by the pre-filter. This liquid can be water or other liquids that need to be filtered. In addition, both the water inlet end 101 and the water outlet end 102 are used for connecting to the liquid supply pipeline, such as the indoor water pipe.

[0059] The valve body 1 is made of metal. A connecting member 2 is arranged inside the valve body 1. The connecting member 2 is injection-molded inside the valve body 1. By providing the connecting member 2, the problem of heavy metal precipitation in the metal valve body 1 can be prevented, and water quality pollution can be avoided.

[0060] Please also refer to Figures 1 to 6 , a first water inlet chamber 201, a second water inlet chamber 202, a third water inlet chamber 203, a fourth water inlet chamber 204 and a cavity hole 205 are arranged inside the connecting member 2.

[0061] Among them, the first water inlet chamber 201 is communicated with the water inlet end 101 of the valve body 1 and the first filter chamber 27. The liquid entering from the water inlet end 101 of the valve body 1 can enter the first filter chamber 27 through the first water inlet chamber 201;

[0062] The second water inlet chamber 202 is communicated with the third water inlet chamber 203. The second water inlet chamber 202 is communicated with the fourth water inlet chamber 204 through the cavity hole 205. The cavity hole 205 is communicated with the first water inlet chamber 201. The fourth water inlet chamber 204 is communicated with the water outlet end 102 of the valve body 1;

[0063] The third water inlet chamber 203 is communicated with the inner cavity of the first filter assembly and the second filter chamber 28.

[0064] Please also refer to Figures 1 to 3 , the lower filter bottle 7 is generally in the structure of a bottle body with openings at both ends. The first filter assembly is arranged inside the lower filter bottle 7; The first filter assembly includes a lower water distributor 5, a lower skeleton 13, an outer turbine 18 and a stack plate assembly arranged outside the lower skeleton 13.

[0065] Please also refer to Figure 1 and Figure 10 , a plurality of first water passing holes 131 are arranged on the lower skeleton 13. The plurality of first water passing holes 131 are evenly distributed on the side surface of the lower skeleton 13. First sealing grooves 132 are provided at the upper end of the lower skeleton 13 and the lower end of the upper skeleton 21. Sealing rings are arranged in the first sealing grooves 132. By providing the sealing rings, a relative seal is formed to prevent liquid from flowing in or out through the gap between the two, affecting the use effect.

[0066] Please also refer to Figure 1 and Figure 8 , the lower water distributor 5 is connected to the lower skeleton 13 and is arranged at the top of the first filter chamber 27. A limiting step is arranged on the inner wall of the lower filter bottle 7. A convex block 501 is arranged on the outer wall of the lower water distributor 5. When the lower water distributor 5 is installed in the lower filter bottle 7, the convex block 501 abuts against the limiting step. Through the cooperation of the convex block 501 and the limiting step, the lower water distributor 5 is fixed in the lower filter bottle 7.

[0067] In this embodiment, the number of bumps 501 is four, and the four limiting steps are distributed in a circular array. In other embodiments, the number of bumps 501 can be three, five or more, and is not specifically limited.

[0068] A plurality of water distribution vanes 502 are arranged on the lower water distributor 5, and the plurality of water distribution vanes 502 are evenly distributed. By arranging the water distribution vanes 502, the inflowing liquid can be evenly distributed.

[0069] Clasps 503 are arranged on the inner wall of the lower water distributor 5, and the lower water distributor 5 and the lower skeleton 13 are snap-connected through the clasps 503.

[0070] The lower water distributor 5 is located at the top of the first filtration chamber 27. The liquid flows into the first water inlet chamber 201 through the water inlet end 101 of the valve body 1, and then flows into the first filtration chamber 27 through the gap of the lower water distributor 5, so that the liquid enters evenly for filtration operation.

[0071] The stack assembly includes a plurality of stacks 6 sleeved outside the lower skeleton 13. The first-stage filtration of the liquid is carried out through the plurality of stacks 6, and larger particle impurities can be filtered out.

[0072] The outer turbine 18 is rotatably arranged at the upper end of the stack assembly. Through the flow-around action of the outer turbine 18, the liquid flowing out of the gap of the lower water distributor 5 is evenly distributed between the outer surfaces of the lower filter bottle 7 and the stacks 6, ensuring that the liquid is fully and evenly dispersed in the first filtration chamber 27 for filtration.

[0073] An inner turbine 16 is further arranged inside the lower skeleton 13. The inner turbine 16 is sleeved outside the switching member 4, and the inner turbine 16 is supported on the swivel base 15.

[0074] Before the liquid flows into the inner cavity of the first filtration assembly, the water flow makes the inner turbine 16 rotate. Through the flow-around action of the inner turbine 16, the liquid evenly flows to the inner cavity of the first filtration assembly, making the flushing more sufficient and effective, and ensuring the flushing effect of the filter.

[0075] Please refer to Figures 1 to 3 together. The pre-filter of the dual-filtering system provided by the present utility model further includes a switching assembly. The switching assembly is movably arranged inside the first filtration assembly and its top extends into the connecting member 2. The switching assembly includes a top cover 3, a switching member 4, a swivel base 15, an elastic member 14 and a piston 9. The switching member 4 is movably arranged inside the lower skeleton 13, and the switching between the filtration state and the flushing state is realized through the movement of the switching member 4.

[0076] Please refer to Figure 1 and Figure 9, the top cover 3 is located at the top of the switching member 4 and is disposed at the second water inlet chamber 202. The top of the top cover 3 extends into the cavity hole 205 inside the connecting member 2. At least two sealing rings are provided on the outer periphery of the top cover 3 for filling the gaps between the top cover 3 and the second water inlet chamber 202, and between the top cover 3 and the cavity hole 205, so as to play a sealing role. A second annular groove 301 is provided on the outer periphery of the top cover 3, and the sealing ring is sleeved at the second annular groove 301 on the outer periphery of the top cover 3.

[0077] Please also refer to Figure 1 and Figure 7 , a third annular groove 401 is provided at the upper end of the switching member 4, and a first limiting portion 302 is correspondingly provided on the top cover 3. The third annular groove 401 and the first limiting portion 302 are connected in cooperation, and the connection between the top cover 3 and the switching member 4 is realized through the first limiting portion 302 and the third annular groove 401.

[0078] The swivel base 15 is sleeved outside the switching member 4. A limiting convex ring 402 is provided at the lower part of the switching member 4, and the limiting convex ring 402 abuts against the top of the swivel base 15.

[0079] The elastic member 14 is disposed between the lower skeleton 13 and the swivel base 15. Specifically, one end of the elastic member 14 abuts against the bottom of the swivel base 15, and the other end of the elastic member 14 abuts against the lower skeleton 13. In the filtering state, the elastic member 14 supports the switching member 4. In the flushing state, the filter is in negative pressure and the elastic member 14 is compressed, and the flushing channel is opened.

[0080] Please also refer to Figure 1 and Figure 11 , the piston 9 is disposed at the bottom of the switching member 4. The threaded portion 403 at the bottom of the switching member 4 is sleeved inside the piston 9, and the piston 9 and the threaded portion 403 are connected by threads. The axial up and down movement of the switching member 4 can drive the piston 9 to move together. A fourth annular groove 901 is provided in the middle of the piston 9, and a sealing ring is provided in the fourth annular groove 901 for sealing the gap between the lower skeleton 13 and the piston 9 to prevent liquid from flowing out of the gap and affecting the use effect. A sealing ring is also provided at the lower part of the piston 9 for sealing the gap between the lower part of the piston 9 and the lower filter bottle 7 to prevent liquid from flowing out of the gap. A reserved drain port 902 is further provided at the bottom of the side of the piston 9 for discharging impurities or sewage during the flushing state.

[0081] In addition, please also refer to Figures 1 to 3 , a sealing member 10 is provided at the lower end of the first filter assembly. At least two sealing rings are provided on the outer periphery of the sealing member 10 to fill the gap between the sealing member 10 and the lower filter bottle 7.

[0082] The lower filter bottle 7 is also provided with a fixing member 11 for fixedly connecting the sealing member 10 to the lower filter bottle 7. The fixing member 11 is provided with internal threads, and the bottom of the sealing member 10 is provided with external threads. The sealing member 10 is threadedly connected to the fixing member 11.

[0083] A ball valve 12 is further provided at the bottom of the lower filter bottle 7. The ball valve 12 is threadedly connected to the fixing member 11; a switching member is provided on the ball valve 12. When the switching member is opened, sewage can be discharged, and when the switching member is closed, filtration is carried out.

[0084] When the switching member is opened, the filter is in a negative pressure state, the switching member 4 moves downward, and the piston 9 moves downward accordingly. At this time, the flushing channel is opened, and impurities or sewage are discharged through the ball valve 12 from the reserved discharge port 902 of the piston 9. The filter is in a flushing state; when the switching member is closed, the switching member 4 maintains its original state, and the filter is in a filtering state.

[0085] In some embodiments, please also refer to Figures 1 to 3 , an upper support 17 and a lower support 8 are further provided in the lower filter bottle 7. The top of the lower support 8 abuts against the bottom of the stack disc assembly, the bottom of the lower support 8 abuts against the piston 9, and the lower support 8 presses the stack disc 6 during filtration. The bottom of the upper support 17 abuts against the top of the stack disc assembly, and the outer turbine 18 is sleeved outside the upper support 17.

[0086] Please also refer to Figures 1 to 3 , the upper filter bottle 26 is generally in the structure of a bottle body with an open bottom. The bottom of the upper filter bottle 26 is threadedly connected to the top end of the valve body 1.

[0087] The second filtering component is arranged in the upper filter bottle 26, and a second filtering chamber 28 is formed therebetween. The second filtering chamber 28 is communicated with the inner cavity of the second filtering component;

[0088] The second filtering component includes an upper water distributor 20, an upper skeleton 21, and a filter screen 22 arranged outside the upper skeleton 21. The upper water distributor 20 is clamped to the upper filter bottle 26. The upper water distributor 20 is connected to the upper skeleton 21 and is arranged at the bottom of the second filtering chamber 28. A plurality of second water passing holes are arranged on the side of the upper skeleton 21. The liquid in the second filtering chamber 28 passes through the filter screen 22 and then passes through the second water passing holes on the side of the upper skeleton 21 to enter the inner cavity of the second filtering component, and the filter screen 22 filters out smaller impurity particles.

[0089] The upper water distributor 20 is located at the bottom of the second filtering chamber 28. After the liquid passes through the first filtration, it flows from the inner cavity of the first filtering component through the second water inlet chamber 202 and the third water inlet chamber 203 into the second filtering chamber 28, passes through the filter screen 22 for the second filtration, and then enters the inner cavity of the second filtering component. After that, it enters the fourth water inlet chamber 204 from the inner cavity of the second filtering component, and finally flows out from the water outlet end 102 of the valve body 1.

[0090] The pre-filter of the double filtration system provided by the present utility model further includes an adapter 19. The lower end of the adapter 19 is hermetically connected to the fourth water inlet chamber 204 of the connecting member 2 through a sealing ring. The upper end of the adapter 19 is connected to the upper skeleton 21, and the bottom end of the upper skeleton 21 is hermetically connected to the upper end of the adapter 19 through a sealing ring.

[0091] In some embodiments, please refer to Figure 1 and Figure 12 together. There is a scraping member 25 outside the upper skeleton 21. The filter screen 22 is located between the scraping member 25 and the upper skeleton 21. There are a plurality of brush hairs 251 on the scraping member 25. The brush hairs of some of the brush hairs 251 are in contact with the filter screen 22, and the brush hairs of some other brush hairs 251 are in contact with the inner wall of the upper filter bottle 26. The filter screen 22 and the inner wall of the upper filter bottle 26 are scrubbed by the brush hairs 251.

[0092] In some embodiments, a gland 23 is provided at the top of the upper skeleton 21 to press the filter screen 22 tightly to prevent the filter screen 22 from coming off the upper skeleton 21 during use.

[0093] In some embodiments, a buffer member 24 is provided between the upper skeleton 21 and the upper filter bottle 26. The buffer member 24 is made of a soft material, such as rubber or silica gel. The buffer member 24 is respectively in contact with the top end of the upper skeleton 21 and the inner wall of the upper filter bottle 26, playing a role of buffering and decompressing to prevent water hammer.

[0094] In some embodiments, a pressure gauge may be provided on the valve body 1 to facilitate observing the pressure condition of the liquid.

[0095] Optionally, scale inhibitor filter materials can be placed inside the upper skeleton 21 and the lower skeleton 13 to prevent scaling.

[0096] The operation process of filtering and flushing of the pre-filter of the double filtration system provided by the present utility model is as follows:

[0097] Please refer to Figures 1 to 12 together. The liquid enters the water inlet end 101 of the valve head from the water inlet pipe. At this time, the elastic member 14 is in a released state to support the switching member 4. At this time, it is in the filtering state. The water flow flows into the first water inlet chamber 201 from the water inlet end 101 of the valve body 1, and then flows into the first filtration chamber 27 through the gaps of the lower water distributor 5. At this time, the outer turbine 18 is driven to achieve the function of circumferential water flow, so that the water flow is more fully and evenly filtered between the inner part of the lower filter bottle 7 and the first filtration component. Some tightly adsorbed dirt will fall off. The raw water first passes through the stack 6 for the first filtration to block larger particulate impurities outside. After the raw water passes through the stack 6 for filtration, it enters the inner cavity of the first filtration component;

[0098] The raw water after the first filtration flows from the inner cavity of the first filtration component through the second water inlet cavity 202 and the third water inlet cavity 203 into the second filtration cavity 28, and is finely filtered for the second time through the filter screen 22. After filtering out fine particles, it enters the inner cavity of the second filtration component. Then, it enters the fourth water inlet cavity 204 from the inner cavity of the second filtration component, and finally flows out from the water outlet end 102 of the valve body 1 and is transported to the rear end of water use.

[0099] Open the switch on the ball valve 12. Since the negative pressure switching component 4 moves downward and switches to the flushing state, the raw water flows into the second filtration component through the cavity hole 205 for reverse flushing operation. The particles on the filter screen 22 are washed out, and the raw water carrying the impurities flushed out from the upper filter bottle 26 continues to flow and enters the first filtration component from the second filtration cavity 28.

[0100] As the switching component 4 moves downward, the stack of wafers 6 becomes loose, and the water flows outwards from the inside of the first filtration component through the dispersed stack of wafers 6. The impurity particles on the stack of wafers 6 are washed out from the gaps of the stack of wafers 6 and finally discharged through the sewage discharge channel of the ball valve 12. Through two reverse flushes, the impurities on the stack of wafers 6 and the filter screen 22 are finally discharged, avoiding the accumulation and residue of impurities between the two-stage filtration components.

[0101] The pre-filter of the double-filtration system provided by the present utility model filters for the first layer through the stack of wafers 6 in the inner cavity of the lower filter bottle 7, and then filters for the second layer through the filter screen 22 in the inner cavity of the upper filter bottle 26, ensuring sufficient filtration working clearance, resulting in good filtration effect and large liquid throughput, and being applicable to filtering water quality in different environments. When the switching component 4 moves downward, the water flow performs reverse flushing, and the impurities on the stack of wafers 6 and the filter screen 22 are washed away and discharged, with thorough sewage discharge, which can effectively improve the service life of the filter.

[0102] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0103] Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the present utility model.

Claims

1. A pre-filter for a dual filtration system, characterized in that, Comprising: Valve body; Lower filter bottle, connected to the valve body; First filter component, disposed inside the lower filter bottle and forming a first filter chamber therebetween, the first filter chamber communicating with the inner chamber of the first filter component; Upper filter bottle, connected to the valve body; Second filter component, disposed inside the upper filter bottle and forming a second filter chamber therebetween, the second filter chamber communicating with the inner chamber of the second filter component.

2. The pre-filter of the double filtration system according to claim 1, characterized in that, A connecting member is provided inside the valve body, and a first water inlet chamber, a second water inlet chamber, a third water inlet chamber, a fourth water inlet chamber and a cavity hole are provided inside the connecting member. Among them, The first water inlet chamber communicates with the water inlet end of the valve body and the first filter chamber; The second water inlet chamber communicates with the third water inlet chamber, and the cavity hole communicates with the first water inlet chamber; The third water inlet chamber communicates with the inner chamber of the first filter component and the second filter chamber; The fourth water inlet chamber communicates with the water outlet end of the valve body.

3. The pre-filter of the double filtration system according to claim 2, characterized in that, The first filter component includes: Lower skeleton; Laminated sheet assembly, including a plurality of laminated sheets sleeved outside the lower skeleton; Outer turbine, rotatably disposed at the upper end of the laminated sheet assembly; Lower water distributor, connected to the lower skeleton and disposed at the top of the first filter chamber.

4. The pre-filter of the double filtration system according to claim 3, characterized in that, A switching component is further included. The switching component is movably disposed inside the first filter component and its top extends into the valve body. The switching component includes: Switching member, movably disposed inside the lower skeleton; Top cover, connected to the switching member, disposed at the second water inlet chamber, and the top of the top cover extends into the cavity hole; Rotating seat, sleeved outside the switching member; Elastic member, disposed between the lower skeleton and the rotating seat, one end of the elastic member abuts against the bottom of the rotating seat, and the other end of the elastic member abuts against the lower skeleton; Piston, disposed at the bottom of the switching member, and the bottom of the switching member is sleeved inside the piston.

5. The pre-filter of the double filtration system according to claim 4, characterized in that, The first filter component further includes an inner turbine, the inner turbine is sleeved outside the switching member, and the inner turbine is supported on the rotating seat.

6. The pre-filter of the double filtration system according to claim 2, characterized in that The second filter component includes: Upper skeleton; Scrubbing member, disposed outside the upper skeleton, and a plurality of brushes are provided on the scrubbing member; Filter screen, disposed between the scrubbing member and the upper skeleton; Upper water distributor, connected to the upper skeleton and disposed at the bottom of the second filter chamber.

7. The pre-filter of the double filtration system according to claim 4, characterized in that, A sealing member and a fixing member are further provided at the bottom of the lower filter bottle. The sealing member is located at the lower end of the first filter component. The fixing member is connected to the lower filter bottle, and the sealing member is threadedly connected to the fixing member.

8. The pre-filter of the double filtration system according to claim 7, characterized in that, A ball valve is further included, disposed at the bottom of the lower filter bottle and fixedly threadedly connected to the fixing member. When the ball valve is closed, the pre-filter of the double-filter system is in the filtering state; when the ball valve is opened, it can drive the switching member to move downward, so that the first water inlet chamber communicates with the fourth water inlet chamber, and the pre-filter of the double-filter system is in the flushing state.

9. The pre-filter of the double filtration system according to claim 4, characterized in that, An upper support and a lower support are further provided inside the lower filter bottle. The bottom of the upper support abuts against the top of the laminated sheet assembly. The outer turbine is sleeved outside the upper support. The top of the lower support abuts against the bottom of the laminated sheet assembly. The bottom of the lower support abuts against the piston.

10. The pre-filter of the double filtration system according to claim 6, characterized in that, It further includes an adapter. The lower end of the adapter is sealingly connected to the fourth water inlet cavity, and the upper end of the adapter is sealingly connected to the bottom end of the upper skeleton.

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