Backwash pre-filter

Abstract

When a second water inlet is communicated with a first water inlet, water flows into a switching piece through the first water inlet, the second water inlet, a lamination runner and an inner framework in sequence, and finally flows out through a water outlet; when the third water inlet is communicated with the first water inlet, water flows through the first water inlet, the third water inlet, the switching piece and the inner framework in sequence to flush the lamination runner from inside to outside, and finally the water flows through the drainage groove and is discharged through the sewage outlet. According to the technical scheme, an original filter screen is omitted, and the piston and the lamination assembly are arranged, so that the lamination assembly is washed more sufficiently and thoroughly in the washing process of the backwashing pre-filter, the filtering effect of the backwashing pre-filter is kept, and the service life of the backwashing pre-filter is prolonged; according to the scheme, a scraping strip assembly used for scraping and washing the inner wall of the filter bottle is arranged on the outer framework.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter technical field, especially relate to a backwash prefilter. BACKGROUND

[0002] The water supply pipeline of city is old and long, and the rust, silt and other impurities of pipeline can cause water equipment control failure, so the prefilter is usually installed on the household pipeline to improve water quality and guarantee the water of rear.

[0003] The prefilter is the first rough filter equipment for the water of whole house, can filter the silt, rust and large particle substance in tap water, prevents the harm of large amount of sediment impurities in city and community water supply pipe network to human body, and plays the positive preprotection role to the dark laid pipeline, faucet, water heating, water heater, boiler, central air conditioner, washing machine, dish washer, coffee machine and other water household electrical appliances (water purifier, pure water machine, soft water machine) etc.

[0004] The prefilter of prior art is usually stacked with multiple laminations and used with filter screen at the same time, but is difficult to flush clean in the use process, so that many impurities are blocked between adjacent laminations, the recovery rate is greatly reduced, and the service life of prefilter is affected. TECHNICAL SOLUTION

[0005] Therefore, the utility model provides a backwash prefilter, cancels the original filter screen, so that the backwash prefilter is more sufficient and thorough to the lamination assembly in the flushing process.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A backwash prefilter, comprising: a valve head, a switching piece, an inner framework, a lamination assembly, a piston, a ball valve, a filter bottle and a pressure sensitive spring;

[0008] The valve head has a first water inlet and a water outlet; the valve head is sleeved on the top of the filter bottle, the bottom of the filter bottle has a blowdown port; the ball valve is arranged at the blowdown port and used for opening and closing the blowdown port;

[0009] The filter bottle is sequentially sleeved with the switching piece, the pressure sensitive spring, the inner framework and the lamination assembly from inside to outside;

[0010] The top of the piston is connected to the bottom end of the switching piece, the bottom of the piston is provided with a drain groove leading to the blowdown port; the outer peripheral wall of the switching piece is provided with a first annular protrusion, the inner peripheral wall of the inner framework is provided with a second annular protrusion, and the pressure sensitive spring is located between the first annular protrusion and the second annular protrusion;

[0011] The lamination assembly is provided with a lamination flow channel; the inner framework has a second water inlet;

[0012] The switching piece is movably arranged in the inner framework, directly below the water outlet, has a third water inlet, and is used for switching the second water inlet and the first water inlet into communication and the third water inlet and the first water inlet into communication;

[0013] When the second water inlet and the first water inlet are in communication, water flows into the switching piece through the first water inlet, the second water inlet, the lamination flow channel and the inner framework in sequence, and finally flows out through the water outlet; when the third water inlet and the first water inlet are in communication, water flows out through the drain outlet via the drain groove, after washing the lamination flow channel from inside to outside through the first water inlet, the third water inlet, the switching piece and the inner framework.

[0014] Preferably, the lamination assembly comprises: a plurality of laminations stacked from top to bottom, and the surface of each lamination is uniformly provided with a plurality of flow guide ribs, and adjacent flow guide ribs form the lamination flow channel.

[0015] Preferably, the longitudinal section of the lamination flow channel gradually increases from inside to outside;

[0016] And / or, the extension direction of the lamination flow channel is arranged at an angle with the radial direction of the lamination.

[0017] Preferably, the outer peripheral wall of the inner framework is provided with a third annular protrusion; the outer peripheral wall of the piston is provided with a piston annular edge;

[0018] The upper end surface of the topmost lamination in the plurality of laminations can abut against the end surface of the third annular protrusion, and the piston annular edge is used to support the lower end surface of the lamination assembly.

[0019] Preferably, the inner framework is divided into a first part, a second part and a third part from top to bottom;

[0020] The outer peripheral wall of the first part is provided with a limiting protrusion, and the filter bottle is provided with a limiting groove matched with the limiting protrusion;

[0021] The peripheral wall of the second part is provided with an inclined impeller, and a plurality of water distribution blades are arranged on the outer peripheral wall of the inclined impeller at intervals, and the gap between adjacent water distribution blades forms a blade hole, and the blade hole is located in the second water inlet;

[0022] The third part is a cylindrical structure axially penetrating, and the third part is provided with a water outlet hole penetrating through the peripheral wall, and the penetration direction of the water outlet hole is arranged at an angle with the radial direction of the third part, and the water outlet hole communicates the lamination flow channel and the switching piece.

[0023] Preferably, further comprising: a silica gel plug arranged between the inner framework and the piston;

[0024] The silica gel plug has an outer convex edge in interference fit with the outer peripheral wall of the piston top, has an inner convex edge in interference fit with the inner peripheral wall of the piston top, and has a convex part for plugging into the bottom of the third part.

[0025] Preferably, the switching piece is divided into a switching top, a switching middle and a switching bottom from top to bottom;

[0026] The switching top is provided with a first backwashing water hole penetrating through the peripheral wall thereof, and the first backwashing water hole is the third water inlet;

[0027] The switching middle is provided with a first slot hole penetrating through the peripheral wall thereof, and the first slot hole communicates the third water inlet and the inner framework;

[0028] The switching bottom is threadedly connected with the piston top.

[0029] Preferably, further comprising: a backwashing framework;

[0030] The backwashing framework is sleeved on the top of the switching piece, and the backwashing framework is provided with a second backwashing water hole penetrating through the peripheral wall thereof; the second backwashing water hole is located between the third water inlet and the first slot hole, and the second backwashing water hole is provided with a backwashing filter screen.

[0031] Preferably, further comprising: a sealing piece, an outer framework and a scraper strip assembly;

[0032] The sealing piece is rotatably arranged in the blowdown port, and the bottom of the sealing piece is provided with the ball valve;

[0033] The outer framework is sleeved between the inner wall of the filter bottle and the outer wall of the lamination assembly, and the bottom of the outer framework is mounted on the top of the sealing piece;

[0034] The outer wall of the outer framework is provided with the scraper strip assembly, and the scraper strip assembly is used for scraping and washing the inner wall of the filter bottle.

[0035] Preferably, the scraper strip assembly comprises: a scraper strip and a scraper strip cover;

[0036] The scraper strip cover buckles the scraper strip on the outer wall of the outer framework, and the scraper strip is spirally arranged on the peripheral wall of the outer framework.

[0037] From the above technical scheme can be seen, the utility model provides a backwash prefilter, cancel the original filter screen, and utilize the setting of piston and laminated component, make the backwash prefilter of the utility model more thorough in the washing process to the laminated component, be favorable to keep the filtering effect of the backwash prefilter of the utility model, prolong the service life of the backwash prefilter of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will be briefly introduced the drawing needed to be used in the embodiment or prior art description, obviously, the drawing in the following description only some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0039] Figure 1 The sectional view structural schematic diagram of the backwash prefilter provided for the embodiment of the utility model is shown in the drawing.

[0040] Figure 2 The sectional view structural schematic diagram of the switching piece provided for the embodiment of the utility model is shown in the drawing.

[0041] Figure 3 The perspective view of the inner framework provided for the embodiment of the utility model is shown in the drawing.

[0042] Figure 4 The sectional view structural schematic diagram of the inner framework provided for the embodiment of the utility model is shown in the drawing.

[0043] Figure 5 The structural schematic diagram of the outer framework and the scraping strip assembly cooperation provided for the embodiment of the utility model is shown in the drawing.

[0044] Figure 6 The structural schematic diagram of the laminated sheet provided for the embodiment of the utility model is shown in the drawing.

[0045] Figure 7 The structural schematic diagram of the laminated sheet provided for the embodiment of the utility model is shown in the drawing.

[0046] Figure 8 The sectional view structural schematic diagram of the piston provided for the embodiment of the utility model is shown in the drawing.

[0047] Figure 9 The sectional view structural schematic diagram of the silica gel plug provided for the embodiment of the utility model is shown in the drawing.

[0048] Figure 10 The perspective view of the backwash framework provided for the embodiment of the utility model is shown in the drawing.

[0049] Figure 11 The water flow direction diagram when the backwash prefilter of the utility model filters.

[0050] Figure 12 Water flow direction diagram for backwashing of the pre-filter.

[0051] 1 is the valve head, 101 is the first water inlet, and 102 is the water outlet.

[0052] 2 is the lead partition;

[0053] 3 is the switching part, 301 is the third water inlet, 302 is the water blocking ring, 303 is the first annular groove, 304 is the second slot hole, 305 is the first slot hole, 306 is the bottom thread, and 307 is the first annular protrusion.

[0054] 4 is the inner skeleton, 401 is the limiting convex point, 402 is the blade hole, 403 is the water outlet hole, 404 is the inner water groove, 405 is the inner skeleton convex rib, 406 is the inner skeleton outer wall, 407 is the first abutting annular edge, 408 is the upper inner wall of the inner skeleton, 409 is the first slot, 410 is the second abutting annular edge, 411 is the second annular protrusion, 412 is the second water inlet, and 413 is the third annular protrusion.

[0055] 5 is the outer skeleton, 501 is the outer skeleton protruding part, 502 is the scraping strip, 503 is the polygonal edge, and 504 is the scraping strip cover.

[0056] 6 is the laminated sheet, 601 is the flow guide rib, and 602 is the laminated sheet flow channel.

[0057] 7 is the silica gel cover.

[0058] 8 is the piston, 801 is the top inner thread, 802 is the piston annular edge, 803 is the second annular groove, and 804 is the drainage groove.

[0059] 9 is the sealing part, and 10 is the ball valve.

[0060] 11 is the silica gel plug, 1101 is the outer convex edge, 1102 is the inner convex edge, and 1103 is the protruding part.

[0061] 12 is the filter bottle, 121 is the sewage outlet, and 13 is the pressure sensing spring.

[0062] 14 is the backwashing skeleton, 1401 is the second backwashing water hole, and 1402 is the buckle.

[0063] 15 is the pressure gauge. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present utility model.

[0065] The backwashing pre-filter provided by the embodiment of the present utility model comprises a valve head 1, a switching piece 3, an inner framework 4, a laminated assembly, a piston 8, a ball valve 10, a filter bottle 12 and a pressure-sensitive spring 13. Figures 1-12 As shown in the figure, the valve head 1 has a first water inlet 101 and a water outlet 102; the valve head 1 is sleeved on the top of the filter bottle 12, and the filter bottle 12 has a blowdown port 121 at the bottom; the ball valve 10 is arranged at the blowdown port 121 and is used for opening and closing the blowdown port 121.

[0066] As shown in the figure, the valve head 1 has a first water inlet 101 and a water outlet 102; the valve head 1 is sleeved on the top of the filter bottle 12, and the filter bottle 12 has a blowdown port 121 at the bottom; the ball valve 10 is arranged at the blowdown port 121 and is used for opening and closing the blowdown port 121. Figure 11 As shown in the figure, the valve head 1 has a first water inlet 101 and a water outlet 102; the valve head 1 is sleeved on the top of the filter bottle 12, and the filter bottle 12 has a blowdown port 121 at the bottom; the ball valve 10 is arranged at the blowdown port 121 and is used for opening and closing the blowdown port 121.

[0067] Figure 1 As shown in the figure, the valve head 1 has a first water inlet 101 and a water outlet 102; the valve head 1 is sleeved on the top of the filter bottle 12, and the filter bottle 12 has a blowdown port 121 at the bottom; the ball valve 10 is arranged at the blowdown port 121 and is used for opening and closing the blowdown port 121.

[0068] The piston 8 is connected to the bottom end of the switching piece 3 at the top, and the piston 8 is provided with a water drainage groove 804 leading to the blowdown port 121 at the bottom; the outer peripheral wall of the switching piece 3 is provided with a first annular protrusion 307, the inner peripheral wall of the inner framework 4 is provided with a second annular protrusion 411, and the pressure-sensitive spring 13 is located between the first annular protrusion 307 and the second annular protrusion 411, as shown in the figure. Figure 11

[0069] As shown in the figure, the valve head 1 has a first water inlet 101 and a water outlet 102; the valve head 1 is sleeved on the top of the filter bottle 12, and the filter bottle 12 has a blowdown port 121 at the bottom; the ball valve 10 is arranged at the blowdown port 121 and is used for opening and closing the blowdown port 121. Figure 6 As shown in the figure, the valve head 1 has a first water inlet 101 and a water outlet 102; the valve head 1 is sleeved on the top of the filter bottle 12, and the filter bottle 12 has a blowdown port 121 at the bottom; the ball valve 10 is arranged at the blowdown port 121 and is used for opening and closing the blowdown port 121. Figure 11 The switching piece 3 is movably arranged in the inner framework 4 and is located directly below the water outlet 102 and has a third water inlet 301 for switching the second water inlet 412 and the first water inlet 101 to be communicated and the third water inlet 301 and the first water inlet 101 to be communicated.

[0070] As shown in the figure, when the second water inlet 412 and the first water inlet 101 are communicated, water flows into the switching piece 3 in sequence through the first water inlet 101, the second water inlet 412, the laminated flow channel 602 and the inner framework 4, and finally flows out through the water outlet 102.

[0071] Figure 11 As shown in the figure, when the second water inlet 412 and the first water inlet 101 are communicated, water flows into the switching piece 3 in sequence through the first water inlet 101, the second water inlet 412, the laminated flow channel 602 and the inner framework 4, and finally flows out through the water outlet 102. Figure 12 ​​​As shown, when the third water inlet 301 is communicated with the first water inlet 101, water flows from inside to outside through the first water inlet 101, the third water inlet 301, the switching piece 3 and the inner framework 4 to wash the laminated flow channel 602, and finally is discharged through the drain outlet 121.

[0072] In the above technical solution, the normal filtering process of the back-flushing pre-filter is as follows: Figure 11 As shown (the arrow direction in the figure is the flow direction of the filtered water), the water to be filtered flows into the switching piece 3 through the first water inlet 101, the second water inlet 412, the laminated flow channel 602 and the inner framework 4, and finally flows out through the water outlet 102, the water flowing out is the water that has been filtered; when it is needed to wash the laminated assembly in the back-flushing pre-filter, as shown Figure 12 As shown (the arrow direction in the figure is the flow direction of the back-flushing water), the ball valve 10 is opened to open the drain outlet 121, under the action of negative pressure, the water flows downward, the piston 8 also moves downward, and then drives the switching piece 3 to move downward, while the switching piece 3 moves downward, the third water inlet 301 is communicated with the first water inlet 101, the back-flushing water flows from inside to outside through the first water inlet 101, the third water inlet 301 and the inner framework 4 to wash the laminated flow channel 602, and finally is discharged through the drain outlet 121, in this process, the back-flushing water washes the laminated flow channel 602 in the opposite direction, so that the impurities in the laminated assembly are washed away.

[0073] Compared with the prior art, the piston 8 and the laminated assembly are arranged to cancel the original filter screen (the original filter screen is arranged between the laminated assembly and the inner framework), so that the back-flushing pre-filter can wash the laminated assembly more completely during the washing process, which is beneficial to maintaining the filtering effect of the back-flushing pre-filter and prolonging the service life of the back-flushing pre-filter.

[0074] The above technical solution is optimized, as shown in Figure 6 and Figure 7 The laminated assembly comprises: a plurality of laminated sheets 6 stacked from top to bottom, the surface of each laminated sheet is uniformly provided with a plurality of flow guide ribs 601, adjacent flow guide ribs 601 form a laminated flow channel 602, and the arrangement of the plurality of laminated sheets 6 makes the filtering effect better and the filtering speed faster.

[0075] The longitudinal section of the laminated flow channel 602 gradually increases from inside to outside, in the technical solution, when it is needed to filter water, the water flows from outside to inside (i.e. from the large end of the laminated flow channel 602 to the small end of the laminated flow channel 602), and when it is needed to back-flush, the water flows from inside to outside (i.e. from the small end of the laminated flow channel 602 to the large end of the laminated flow channel 602), so that the impurities are more easily washed away during back-flushing.

[0076] And / or, the extension direction of the lamination flow channel 602 is arranged at an angle with the radial direction of the lamination 6. In this way, the water flow can drive the lamination 6 to rotate, thereby facilitating the flushing of the lamination 6. As a preferred embodiment, the lamination flow channel 602 is an arc-shaped flow channel.

[0077] Further optimization of the above technical solutions, such as Figure 3 As shown in the figure, the outer peripheral wall of the inner framework 4 is provided with a third annular protrusion 413; as Figure 8 As shown in the figure, the outer peripheral wall of the piston 8 is provided with a piston annular edge 802;

[0078] The upper end surface of the topmost lamination 6 in the plurality of laminations 6 can abut against the end surface of the third annular protrusion 413, and the piston annular edge 802 is used to support the lower end surface of the lamination assembly.

[0079] In the technical solution, when the backwashing pre-filter is filtering, the piston annular edge 802 presses the laminations between the piston annular edge 802 and the third annular protrusion 413 upward. As a preferred embodiment, the projections of the lamination flow channels 602 of adjacent laminations in the vertical direction are staggered after being pressed. When the backwashing pre-filter is backwashing, the piston 8 moves downward under the action of negative pressure, and the pressed laminations 6 are released axially. In the process of flushing, the laminations 6 rotate under the action of the water flow, so that the flushing is more thorough.

[0080] In the technical solution, as Figure 3 And Figure 4 As shown in the figure, the inner framework 4 is divided into a first part, a second part and a third part from top to bottom;

[0081] The outer peripheral wall of the first part is provided with a limiting protrusion 401, and the filter bottle 12 is provided with a limiting groove matched with the limiting protrusion 401. The limiting groove and the limiting protrusion 401 are arranged to make the fixation between the filter bottle 12 and the inner framework 4 more stable;

[0082] The peripheral wall of the second part is sleeved with an inclined impeller, and a plurality of water distribution blades are arranged on the outer peripheral wall of the inclined impeller at intervals. The gap between adjacent water distribution blades forms a blade hole 402, and the blade hole 402 is located in the second water inlet 412.

[0083] The third part is a cylindrical structure penetrating in the axial direction, and the third part is provided with a water outlet hole 403 penetrating through the peripheral wall thereof. The penetration direction of the water outlet hole 403 is arranged at an angle with the radial direction of the third part. The water outlet hole 403 communicates the lamination flow channel 602 and the switching piece 3.

[0084] In the above technical solution, when the backwashing pre-filter starts backwashing, water flows from the water outlet hole 403 to the small end of the laminated flow channel 602; preferably, the laminated flow channel 602 is an arc-shaped flow channel, and the water outlet hole 403 is an arc-shaped hole, and the curvature radii of the two are the same, so that the speed of the backwashing water flow is faster; preferably, a first slot 409 is arranged between the second part and the third part, and the first slot 409 is used to accelerate the water flow after being filtered by the laminated sheet 6, as shown in Figure 11 .

[0085] The above technical solution is optimized, as shown in Figure 8 and Figure 9 , further comprising: a silica gel plug 11 arranged between the inner framework 4 and the piston 8;

[0086] The silica gel plug 11 has an outer convex edge 1101 in interference fit with the outer peripheral wall of the top of the piston 8, has an inner convex edge 1102 in interference fit with the inner peripheral wall of the top of the piston 8, and has a convex part 1103 for plugging the bottom of the third part, and the silica gel plug 11 is plugged into the bottom of the inner framework 4 to seal the bottom waterway; preferably, the bottom of the piston 8 is further provided with a second annular groove 803, and the second annular groove 803 is arranged to install a silica gel ring to seal the gap with the inner wall of the outer framework 5.

[0087] In the technical solution, as shown in Figure 2 , the switching piece 3 is divided into a switching top, a switching middle and a switching bottom from top to bottom;

[0088] The switching top is provided with a first backwashing water hole penetrating through the peripheral wall thereof, and the first backwashing water hole is the third water inlet 301;

[0089] The switching middle is provided with a first slot hole 305 penetrating through the peripheral wall thereof, and the first slot hole 305 communicates the third water inlet 301 and the inner framework 4;

[0090] The switching bottom is threadedly connected with the top of the piston 8.

[0091] In the technical solution, when the backwashing pre-filter needs to be backwashed, water flows from the first water inlet 101 into the first backwashing water hole, and then flows into the first slot hole 305, and then flows to the inner framework 4 to flush the laminated sheet assembly; preferably, the peripheral wall of the switching top is further provided with a second slot hole 304 penetrating through the peripheral wall thereof, the second slot hole 304 is located between the first slot hole 305 and the first backwashing water hole, the laminated sheet 6 is filtered, and the filtered water flow flows into the second slot hole 304 from the first slot 409, and then flows to the water outlet 102.

[0092] The above technical solution is optimized, as shown in Figure 10 , further comprising: a backwashing framework 14;

[0093] The flushing framework 14 is sleeved in the top of the switching piece 3, the backflushing framework 14 is provided with a second backflushing water hole 1401 penetrating through the peripheral wall thereof; the second backflushing water hole 1401 is located between the third water inlet 301 and the first slot hole 305, and the second backflushing water hole 1401 is provided with a flushing filter screen; the flushing filter screen can filter sundries; in an embodiment, the inner wall of the backflushing framework and the flushing filter screen are integrally formed by an injection molding process, and the flushing filter screen is a stainless steel filter screen; in another embodiment, the backflushing framework 14 is further provided with a buckle 1402, which is buckled with the switching piece 3; it should be noted that the flushing filter screen contains scale inhibiting filter material to prevent scale formation.

[0094] In the technical solution, as shown in Figure 5 It further comprises a sealing piece 9, an outer framework 5 and a scraping strip assembly.

[0095] The sealing piece 9 is rotatably arranged in the blowdown port 121, and the bottom of the sealing piece 9 is provided with a ball valve 10.

[0096] The outer framework 5 is sleeved between the inner wall of the filter bottle 12 and the outer wall of the lamination assembly, and the bottom of the outer framework 5 is mounted on the top of the sealing piece 9.

[0097] The outer wall of the outer framework 5 is provided with a scraping strip assembly, which is used for scraping and washing the inner wall of the filter bottle 12.

[0098] In the technical solution, the rotation of the sealing piece 9 drives the rotation of the outer framework 5, and in the process of rotation of the outer framework 5, the scraping strip assembly scrapes and washes the inner wall of the filter bottle 12; of course, in an embodiment, the water flow can drive the rotation of the sealing piece 9 in the process of flushing, and then the sealing piece 9 drives the rotation of the outer framework 5.

[0099] The above technical solution is optimized, as shown in Figure 5 The scraping strip assembly comprises a scraping strip 502 and a scraping strip cover 504.

[0100] The scraping strip cover 504 buckles and presses the scraping strip 502 on the outer wall of the outer framework 5, so that the scraping strip 502 is fixed on the outer wall of the outer framework 5 and avoids falling off; and the scraping strip 502 is arranged in a spiral shape on the peripheral wall of the outer framework 5, so that the cleaning effect on the inner wall of the filter bottle 12 is better.

[0101] In some embodiments, as Figure 1As shown, the upper internal thread of the valve head 1 is screwed with the external thread on the filter bottle 12, the sealing ring installed on the groove of the bottle body 12 is compressed to form a seal to prevent water from flowing out of the bottle body from the gap between the two threads, the left side of the valve head 1 is the first water inlet 101, and the right side is the water outlet 102, the diameter of the first water inlet 101 is equal to that of the water outlet 102; the external threads on both sides of the valve head 1 play a connecting role with the pre-installed adapter. The lead isolation member 2 is arranged on the inner wall of the valve head 1 to isolate the water from each other and avoid the precipitation of heavy metal substances from the valve head 1; the switching member 3 can move axially up and down, the outer sleeve of the water blocking ring 302 is sleeved with a silica gel sleeve, which can seal the axial movement of the water inlet and outlet, the first backwashing water hole is used for water flow to flow in when backwashing, and is also connected with the backwashing frame 14; when backwashing, the water flow only flows out from the first slot hole 305, the first slot hole 305 is connected with the internal water groove 404 to deliver the backwashing water flow, the annular groove 303 is installed with a sealing ring to seal the gap between other assembled parts, and the bottom thread 306 is matched with the internal thread of the piston 8; in addition, the valve head 1 is provided with a pressure gauge 15.

[0102] In some embodiments, as shown in Figure 1 and Figure 3 , the outer wall 406 is sleeved into a plurality of laminates 6, the four limiting convex points 401 are matched with the limiting groove of the filter bottle 12, the water to be filtered forms a rotating turbulent flow when passing through the blade hole 402, and then is filtered through the laminates 6, and the filtered water enters the second slot hole 304 and the first slot hole 305 as shown in Figure 11 ; when backwashing, the switching member 3 moves down, the third slot of the first annular groove 303 abuts against the first annular edge 407, the fourth slot abuts against the second annular edge 410, and the second slot abuts against the upper inner wall 408 of the inner frame (the upper part of the inner wall of the inner frame is the upper inner wall 408 of the inner frame, as shown in Figure 4 ), which closes the first slot 409, the water outlet hole 403 is connected with the internal water groove 404, the water outlet hole 403 sprays water obliquely to drive the laminates 6 to rotate, and the inclined hole column can be arranged in multiple columns in the axial direction, and each column can be provided with a plurality of hole positions. Figure 2

[0103] In some embodiments, as shown in Figures 1-12 , the polygonal edge 503 is sleeved on the sealing member 9, the sealing member 9 rotates to drive the outer frame 5 to scrape and wash the inner wall of the filter bottle 12, the outer frame is provided with a scraping strip 502 and a scraping strip cover 504, the scraping strip cover 504 buckles the scraping strip 502 on the outer frame to make it stable and not easy to fall off, and the scraping strip is also arranged in a circle according to the inclined line pattern of the frame, which can enhance the circular rotating water flow. ​

[0104] In some embodiments, a plurality of laminations 6 are arranged in a neat set on the outer wall 406 of the inner skeleton, and the outer ring sawteeth can form a rough filtering barrier. Fine particles are filtered through the lamination flow channel 602, and the holes of the lamination flow channel 602 gradually change from large to small. The silica gel cover 7 is provided with buckles that are clamped with the convex ribs 405 of the inner skeleton, and the silica gel plug 11 is compressed. The sealing member 9 is installed inside the bottle body and has internal threads that cooperate with the ball valve.

[0105] In some embodiments, the piston 8 has internal threads 801 at the top end that are screwed to cooperate with the bottom end threads 306 of the switching member, and the annular edge 802 of the piston drags the bottom end of the lamination. During filtration, the piston and the switching member 3 are lifted by the pressure spring 13 to press the laminations 6. The second annular groove 803 is used to install the silica gel ring seal and the gap between the inner wall of the outer skeleton 5. The drainage groove 804 is used to drain sewage. When the sewage discharge channel is opened, the piston drives the switching member 3 to move downward to close the filtered water hole and enter the backwashing state. The ball valve 10 has external threads that cooperate with the internal threads of the sealing member. The ball valve is closed to filter, and the ball valve 10 is opened to switch to the backwashing state. The filter bottle 12 receives filtered water and is internally provided with a filter core assembly with external threads that are screwed with the internal threads of the valve head 1.

[0106] The technical features mentioned above, the technical features to be mentioned below, and the technical features shown in the drawings alone can be combined with each other arbitrarily, as long as the combined technical features are not contradictory to each other. All feasible combinations of features are explicitly described herein. Any one of the multiple sub-features contained in the same sentence can be applied independently, without necessarily being applied together with other sub-features.

[0107] The present solution will be further described below in conjunction with specific embodiments:

[0108] As shown in ​ , the source water enters from the left end of the valve head, is filtered by the lamination filter core, and reaches the inside of the filter core. The clean water is then delivered to the water outlet and then to the water outlet. The sewage discharge mode is as follows: the sewage discharge ball valve is opened, the piston drives the switching member to move downward, the pressure spring is compressed, the filter core enters the reverse washing state, the laminations are axially dispersed, the water flow is washed from the inside to the outside of the water outlet, and the laminations can be rotated. The dirt, impurities, and mud are quickly washed out and finally discharged outside.

[0109] The advantages of the present technical solution are as follows: The laminations are upgraded and arranged in a plurality of numbers and are overlapped and connected together in a regular manner. The cross section of the water hole is not uniform, forming a complex water hole (i.e., the lamination flow channel). The pre-filter can satisfy pure lamination filtration. During backwashing, the laminations can be axially released and loosened, and can be rotated, so that the washing is more complete. During filtration, the original state can be restored. In the process of washing, the movable sealing member can be driven to scrape and wash the inner wall of the outer skeleton of the filter bottle, and finally the dirt is discharged to the outside of the bottle with the water flow.

[0110] The various embodiments described in this specification are presented by way of example, and each embodiment describes a specific implementation of the present application. Each embodiment is not intended to exclude other embodiments, and the same or similar features can be used in other embodiments.

[0111] The above description of disclosed embodiments is intended to be illustrative and not restrictive. Many modifications of these embodiments by one having ordinary skill in the art are intended to be within the scope of the application. Thus, the application is not to be limited to the embodiments described herein but rather can be practiced with modification and alteration within the scope and spirit of the appended claims. Accordingly, the specification is to be regarded in an illustrative manner and all such modifications are intended to be included within the scope of the application.

Claims

1. A backflush prefilter, characterized in that The valve head (1), the switching piece (3), the inner skeleton (4), the laminated assembly, the piston (8), the ball valve (10), the filter bottle (12) and the pressure sensitive spring (13) are included. The valve head (1) has a first water inlet (101) and a water outlet (102); the valve head (1) is sleeved on the top of the filter bottle (12), and the bottom of the filter bottle (12) has a sewage outlet (121); the ball valve (10) is arranged on the sewage outlet (121) and is used for opening and closing the sewage outlet (121). The filter bottle (12) is sequentially sleeved with the switching piece (3), the pressure sensitive spring (13), the inner skeleton (4) and the laminated assembly from inside to outside. The top of the piston (8) is connected to the bottom end of the switching piece (3), and the bottom of the piston (8) is provided with a drainage groove (804) leading to the sewage outlet (121); the outer peripheral wall of the switching piece (3) is provided with a first annular protrusion (307), the inner peripheral wall of the inner skeleton (4) is provided with a second annular protrusion (411), and the pressure sensitive spring (13) is located between the first annular protrusion (307) and the second annular protrusion (411). The laminated assembly is provided with a laminated flow channel (602); and the inner skeleton (4) has a second water inlet (412). The switching piece (3) is movably arranged in the inner skeleton (4) and located directly below the water outlet (102), has a third water inlet (301) and is used for switching the second water inlet (412) and the first water inlet (101) into communication and switching the third water inlet (301) and the first water inlet (101) into communication. When the second water inlet (412) and the first water inlet (101) are in communication, water flows into the switching piece (3) through the first water inlet (101), the second water inlet (412), the laminated flow channel (602) and the inner skeleton (4) in sequence and finally flows out through the water outlet (102); when the third water inlet (301) and the first water inlet (101) are in communication, water flows into the laminated flow channel (602) from inside to outside through the first water inlet (101), the third water inlet (301), the switching piece (3) and the inner skeleton (4) in sequence and finally flows out through the sewage outlet (121) through the drainage groove (804). The laminated assembly includes a plurality of laminated sheets (6) stacked from top to bottom, and the surface of each laminated sheet is uniformly provided with a plurality of guide ribs (601), and adjacent guide ribs (601) form the laminated flow channel (602).

2. The backflushing prefilter according to claim 1, characterized in that The longitudinal section of the laminated flow channel (602) gradually increases from inside to outside; 3. The backflushing prefilter according to claim 2, characterized in that And / or, the extension direction of the laminated flow channel (602) is arranged at an angle with the radial direction of the laminated sheet (6). The outer peripheral wall of the inner skeleton (4) is provided with a third annular protrusion (413), and the outer peripheral wall of the piston (8) is provided with a piston annular edge (802).

4. The backflushing prefilter of claim 2, wherein, ​ The upper end face of the topmost one of the plurality of laminations (6) can abut against the end face of the third annular protrusion (413), and the piston annular edge (802) is configured to support the lower end face of the lamination assembly.

5. The backflushing prefilter of claim 1, wherein, The inner skeleton (4) is divided into a first part, a second part and a third part from top to bottom. The first part outer peripheral wall is provided with a limiting convex point (401), and the filter bottle (12) is provided with a limiting groove matched with the limiting convex point (401). The peripheral wall of the second part is sleeved with an inclined impeller, and a plurality of water distribution blades are arranged along the outer peripheral wall of the inclined impeller, the gaps between adjacent water distribution blades form blade holes (402), and the blade holes (402) are located in the second water inlet (412). The third part is a cylinder structure penetrating in the axial direction, and the third part is provided with a water outlet hole (403) penetrating through the peripheral wall thereof, the penetrating direction of the water outlet hole (403) is arranged at a certain angle with the radial direction of the third part, and the water outlet hole (403) communicates the lamination flow channel (602) and the switching piece (3).

6. The backflushing prefilter of claim 5, wherein, Further comprising: A silica gel plug (11) is arranged between the inner skeleton (4) and the piston (8). The silica gel plug (11) has an outer convex edge (1101) in interference fit with the top outer peripheral wall of the piston (8), has an inner convex edge (1102) in interference fit with the top inner peripheral wall of the piston (8), and has a convex part (1103) for plugging into the bottom of the third part.

7. The backflushing prefilter of claim 1, wherein, The switching piece (3) is divided into a switching top, a switching middle and a switching bottom from top to bottom. The switching top is provided with a first backwashing water hole penetrating through the peripheral wall thereof, and the first backwashing water hole is the third water inlet (301). The switching middle is provided with a first slot hole (305) penetrating through the peripheral wall thereof, and the first slot hole (305) communicates the third water inlet (301) and the inner skeleton (4). The switching bottom is threadedly connected with the top of the piston (8).

8. The backflushing prefilter according to claim 7, characterized in that Further comprising: A backwashing skeleton (14); The backwashing skeleton (14) is sleeved in the top of the switching piece (3), and the backwashing skeleton (14) is provided with a second backwashing water passing hole (1401) penetrating through the peripheral wall thereof; the second backwashing water passing hole (1401) is located between the third water inlet (301) and the first slot hole (305), and the second backwashing water passing hole (1401) is provided with a backwashing filter screen.

9. The backflushing prefilter according to any one of claims 1-8, characterized in that, Further comprising: A sealing piece (9), an outer skeleton (5) and a scraper assembly; The sealing piece (9) is rotatably arranged in the blowdown port (121), and the ball valve (10) is arranged at the bottom of the sealing piece (9). The outer skeleton (5) is sleeved between the inner wall of the filter bottle (12) and the outer wall of the lamination assembly, and the bottom of the outer skeleton (5) is mounted on the top of the sealing piece (9). The outer wall of the outer skeleton (5) is provided with a scraper assembly, and the scraper assembly is used for scraping and washing the inner wall of the filter bottle (12).

10. The backflushing prefilter of claim 9, the wiper bar assembly comprising: A scraper (502) and a scraper cover (504); The scraping strip cover (504) buckles the scraping strip (502) to the outer wall of the exoskeleton (5), and the scraping strip (502) is spirally arranged on the outer peripheral wall of the exoskeleton (5).

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