A backwashing multi-layer laminated pre-filter

Abstract

The present invention discloses a high-efficiency backwashing multi-layer laminated pre-filter, comprising a valve body, a main valve core, a filter assembly and a valve stem, wherein a valve core seat is arranged in the valve body, an upper cavity and a lower cavity are arranged in the valve body, a one-way valve for one-way flow toward the lower cavity is arranged between the upper cavity and the lower cavity, three flow channels including an inlet flow channel, a filter element inner cavity flow channel and an outlet flow channel are arranged in the valve core seat, three flow channel upper ports of the inlet flow channel, the outlet flow channel and the filter element inner cavity flow channel are all formed on the top of the valve core seat, the other end of the inlet flow channel is connected to the water inlet pipe, and the other end of the outlet flow channel is connected to the water outlet pipe; the main valve core is arranged on the valve core seat, and is used to make the upper parts of any two flow channels on the valve core seat conductive, the present invention adopts two pairs of plane-sealed valve cores and synchronous linkage, that is, four valve plates, two of which are fixed, and the other two can be rotated by external force to achieve synchronous linkage, thereby switching the flow channel to achieve the filtering, bypass and backwashing functions of the filter.

Description

Technical Field

[0001] The invention relates to a filter, in particular to a high-efficiency backwashing multi-layer laminated pre-filter. Background Art

[0002] The filter elements of pre-filters on the market are mainly mesh-type structures, and the cleaning methods include positive flushing, siphon cleaning or brushing. The limitation of mesh-type filter elements is that it is difficult to clean the filter element, especially automatic flushing or brushing. The filter element often needs to be removed and brushed to be cleaned more cleanly. Mesh-type pre-filtration often pollutes water due to corrosion of the filter, requiring long-term maintenance or replacement, and has a limited service life. The pre-filter of the prior art will interrupt the subsequent water supply when the filter element is automatically flushed or disassembled for cleaning, causing inconvenience to home life. There are also some pre-filters on the market that have backwashing functions, but the backwashing effect is poor, or the limited structure makes it difficult to remove dirt. Summary of the invention

[0003] The object of the present invention is to provide a high-efficiency backwashing multi-layer laminated pre-filter to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A high-efficiency backwashing multi-layer laminated pre-filter, comprising a valve body, a main valve core, a filter assembly and a valve stem, wherein a valve core seat is arranged in the valve body, an upper cavity and a lower cavity are arranged in the valve body, a one-way valve for one-way flow to the lower cavity is arranged between the upper cavity and the lower cavity, and three flow channels including a water inlet flow channel, a filter element inner cavity flow channel and a water outlet flow channel are arranged in the valve core seat, and the three flow channel upper ports of the water inlet flow channel, the water outlet flow channel and the filter element inner cavity flow channel are all formed on the top of the valve core seat, the other end of the water inlet flow channel is connected to the water inlet pipe, and the other end of the water outlet flow channel is connected to the water outlet pipe;

[0006] The main valve core is arranged on the valve core seat, and is used to make the upper parts of any two flow channels on the valve core seat conduct.

[0007] The filter assembly includes an outer cylinder, a lamination rack, a plurality of laminations and an auxiliary valve core, wherein the lamination rack is coaxially arranged in the outer cylinder, and a plurality of laminations are stacked and sleeved on the outside of the lamination rack. The outer cylinder is located on the outside of the lamination rack to form an outer cavity, and the outer cavity is communicated with the lower cavity. A drain port is provided at the bottom end of the outer cavity. An inner cavity is formed inside the lamination rack, and the inner cavity is communicated with the inner cavity flow channel of the filter element. A flow groove is formed on the peripheral side of the inner cavity. The auxiliary valve core is installed at the drain port to realize the opening and closing of the drain port.

[0008] The valve stem passes through the main valve core, the valve core seat, the inner cavity and the auxiliary valve core in sequence and is rotatably arranged so that the main valve core and the auxiliary valve core can be adjusted synchronously.

[0009] As a further solution of the present invention: the main valve core includes an active plate and a main stator plate, the main stator plate is fixedly mounted on the valve core seat, the active plate and the main stator plate are planarly sealed and coaxially rotated, the main stator plate is respectively provided with three through holes which are connected with the water inlet channel, the water outlet channel and the inner cavity channel of the filter element in sequence, a blind hole is provided on the active plate, the blind hole can make the upper parts of any two adjacent through holes on the main stator plate conductive, and the active plate is fixedly connected to the valve stem.

[0010] As a further solution of the present invention: the auxiliary valve core includes an auxiliary stator and an auxiliary movable plate. The auxiliary stator is fixedly installed at the drain outlet, and a valve hole connected to the drain outlet is opened on it. The auxiliary movable plate is plane-sealed and coaxially rotatably arranged on the auxiliary stator, and the auxiliary movable plate is fixedly connected to the valve stem.

[0011] As a further solution of the present invention: it also includes a shift fork, which is rotatably mounted on the valve body and placed in the upper cavity, the active plate is fixedly mounted on the bottom of the shift fork, and the shift fork is fixedly connected to the valve stem.

[0012] As a further solution of the present invention: the three through holes on the main stator are all arc-shaped through holes and are distributed in three equal parts in the circumferential direction.

[0013] As a further solution of the present invention: the blind hole on the active sheet is an arc-shaped hole occupying two-thirds of the circumference, and the active sheet is also provided with an arc-shaped through hole occupying one-third of the circumference.

[0014] As a further solution of the present invention: the stacking rack includes an upper round seat, a stacking support seat and a tube, the top of the upper round seat forms an inner port connected to the inner cavity flow channel of the filter element, a plurality of tubes are fixedly installed at the bottom of the upper round seat and are evenly distributed in a circumferential direction, the stacking support seat is movably arranged below the tube, a plurality of tubes and the stacking support seat together enclose the inner cavity, the flow groove is formed between adjacent tubes, a spring is arranged between the stacking support seat and the bottom of the outer tube, the spring squeezes the stacking support seat upward and squeezes a plurality of stacks sleeved on the outer periphery of the tube tightly.

[0015] As a further solution of the present invention: there is a lumen in the tube, the top of the lumen is open, the bottom is sealed, the opening at the top of the lumen is connected to the inner port, and a plurality of jet holes are vertically opened on the circumference of the tube, and the hole axis direction of the jet hole extends toward the tangent direction of the circle where the multiple tubes are located.

[0016] As a further solution of the present invention: a flow limiting valve core which conducts one-way from bottom to top is floatingly installed on the top of the inner cavity.

[0017] As a further solution of the present invention: jet steps are respectively provided on the upper and lower ends of the laminate, and the end faces where the jet steps are located face the center direction of the laminate.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention adopts two pairs of plane-sealed valve cores and synchronizes them, that is, four valve plates, two of which are fixed, and the other two can be rotated by external force to achieve synchronized linkage, thereby switching the flow channel and realizing the filtering, bypassing and backwashing functions of the filter.

[0020] 2. The active plate on the main valve core adopts a three-part structure, which maximizes the flow cross-sectional area of ​​the filter and thus increases the flow rate.

[0021] 3. In the filtering state, the multi-layer stacking sheets are kept in a compressed state to achieve the required filtering accuracy. In the backwashing state, the multi-layer stacking sheets are in a relaxed state, increasing the interval between the stacking sheets to facilitate the flushing of dirt.

[0022] 4. In the bypass state, the internal pressure of the filter assembly can be released, and the filter assembly is in a water-free state at this time, so the filter assembly can be disassembled and manually cleaned under the condition of uninterrupted water supply.

[0023] 5. The inner cavity of the stacking rack is surrounded by a plurality of tubes, the top of which is open and connected to the inner port, and a plurality of jet holes are vertically opened on the circumference of the tube, the hole axis direction of the jet hole extends toward the tangent direction of the circumference of the plurality of tubes. During backwashing, the raw water enters the filter assembly from the inner port in two ways, one way enters the inner cavity and flows out from the flow groove between adjacent tubes to the outer cavity and washes the relaxed stacking sheets, and the other way enters the tube cavity from the top opening, and then jets along the tangent direction of the circumference from the plurality of jet holes distributed from the top on the side of the tube cavity. The two streams of water produce an impact turbulence effect at the stacking sheets, thereby increasing the impact force on the stacking sheets and increasing the impact contact surface, so that the stacking sheets produce greater vibrations, further improving the cleaning effect.

[0024] 6. A flow-limiting valve core that is unidirectionally conducted from bottom to top is installed floatingly on the top of the inner cavity. In the filtering mode, the filtered water of the present invention is normally discharged by pushing up the flow-limiting valve core from the inner cavity. In the backwashing mode, the flow-limiting valve core blocks the inner cavity, so that all the raw water enters the tube cavity and is ejected through the jet hole at high pressure, thereby increasing the jet pressure to achieve high-intensity flushing of the laminate.

[0025] 7. Jet steps are respectively provided on the upper and lower ends of the laminate, and the end face where the jet steps are located faces the center of the laminate. The raw water is ejected outward along the tangential direction of the circumference of the multiple tubes through the jet holes and acts on the jet steps on the laminate. Under the impact force of the raw water, the jet steps cause the laminate to be subjected to tangential impact force, and cause the laminate to rotate rapidly about its central axis, thereby causing the laminate to rotate relative to each other to achieve a scrubbing effect. Combined with the impact of the water flow, more than 95% of the accumulated dirt on the laminate can be scrubbed and removed, so that the laminate is in a clean state again, thereby improving the filtering effect of repeated use.

[0026] 8. The drain outlet is arranged at the bottom. The smooth flow channel makes it easy to discharge dirt and can generate a certain negative pressure, so that the rotation of the stacking sheets can achieve a better scrubbing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a high-efficiency backwash multi-layer laminated pre-filter;

[0028] Figure 2 is a top view of the valve body;

[0029] Figure 3 is a cross-sectional view of the valve body;

[0030] Figure 4 is a cross-sectional view of the valve body;

[0031] Figure 5 is a cross-sectional view of a filter assembly;

[0032] Figure 6 for Figure 5 A partial enlarged view of the middle drain outlet;

[0033] Figure 7 It is a structural schematic diagram of a lamination rack;

[0034] Figure 8 is a transverse cross-sectional view of a lamination rack;

[0035] Fig. 9 This is a schematic diagram of the structure of the main valve core;

[0036] Fig.10 It is a structural schematic diagram of the auxiliary valve core;

[0037] Fig.11 It is a schematic diagram of the structure of the lamination;

[0038] In the figure: valve body 1, valve core seat 11, water inlet flow channel 11a, water outlet flow channel 11b, filter inner cavity flow channel 11c, upper cavity 1d, lower cavity 1e, water inlet pipe 11a', water outlet pipe 11b', inner cavity interface 11c', outer cavity interface 1e', valve cover 12, one-way valve 13, fork 14, valve stem 15;

[0039] Main valve core 2, main stator plate 21, first through hole 21a, second through hole 21b, third through hole 21c, active plate 22, fourth through hole 22a, blind hole 22b;

[0040] Filter assembly 3, outer cylinder 31, laminated plate 33, jet step 33a, inner cavity 34, inner port 34a, outer cavity 35, outer port 35a, drain port 36, auxiliary valve core 37, auxiliary moving plate 371, auxiliary fixed plate 372, spring 38;

[0041] The lamination rack 32, the upper round seat 321, the lamination support seat 322, the tube 323, the tube cavity 323a, the jet hole 323a', and the flow groove 323b. DETAILED DESCRIPTION

[0042] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0043] See also Figure 1 In this embodiment, a high-efficiency backwashing multi-layer laminated pre-filter includes a valve body 1, a main valve core 2, a filter assembly 3, an auxiliary valve core 37 and a valve stem 15.

[0044] Combination Figure 2 and Figure 3 The valve body 1 is fixedly provided with a valve cover 12 on the top, a valve core seat 11 is provided inside the valve body 1, an inlet pipe 11a' and an outlet pipe 11b' are provided outside the valve body 1, an inlet flow channel 11a, a filter element inner cavity flow channel 11c and an outlet flow channel 11b are provided inside the valve core seat 11, an upper cavity 1d is formed above the valve body 1 and outside the valve core seat 11, a lower cavity 1e is formed below the valve body 1, and the three flow channel upper ports of the inlet flow channel 11a, the outlet flow channel 11b and the filter element inner cavity flow channel 11c are all formed The filter element has a plurality of inner chambers 11a and a plurality of outer chambers 11b, each of which is formed on the top of the valve core seat 11 and is evenly distributed in an annular direction. The water inlet channel 11a is connected to the water inlet pipe 11a', and the water outlet channel 11b is connected to the water outlet pipe 11b'. The bottom end of the inner chamber of the filter element forms an inner chamber interface 11c' in the lower chamber 1e, and the bottom end of the lower chamber 1e forms an outer chamber interface 1e'. The outer chamber interface 1e' is coaxially distributed with the inner chamber interface 11c', and a one-way valve 13 for one-way flow to the lower chamber 1e is installed between the upper chamber 1d and the lower chamber 1e.

[0045] Combination Figure 4 The fork 14 is rotatably mounted on the valve body 1 and placed in the upper chamber 1d. The main valve core 2 is arranged between the valve core seat 11 and the fork 14, and is used to switch the flow channels of the water inlet channel 11a, the water outlet channel 11b and the filter inner cavity channel 11c to change the water flow direction. The main valve core 2 includes an active plate 22 and a main fixed plate 21. The main fixed plate 21 is fixedly mounted on the valve core seat 11, and the two are sealed by a sealing ring. The active plate 22 is fixedly connected to the fork 14, and the active plate 22 and the main fixed plate 21 are plane-sealed and coaxially rotated. The active plate 22 is driven to rotate by the fork 14 to realize the switching of the flow channel.

[0046] See also Fig. 9The main stator 21 is a circular valve plate, which is fixedly mounted on the filter element seat, and is respectively provided with a first through hole 21a, a second through hole 21b and a third through hole 21c which are connected with the water inlet channel 11a, the water outlet channel 11b and the filter element inner cavity channel 11c in sequence. The three through holes on the main stator 21 are arc-shaped through holes and are distributed in three equal parts in a circumferential direction to provide a larger flow rate.

[0047] The active plate 22 is also a circular valve plate, which is fixedly mounted on the fork 14 and rotates synchronously with the fork 14. A blind hole 22b occupying two-thirds of the circumference and a fourth through hole 22a occupying one-third of the circumference are provided on the active plate 22. As the active plate 22 rotates, the blind hole 22b can connect the upper parts of any two adjacent through holes on the main stator plate 21, and the fourth through hole 22a can connect with another through hole on the active plate 22 except the two through holes connected by the blind hole 22b, thereby changing the direction of water flow.

[0048] See also Figure 5 The filter assembly 3 includes an outer cylinder 31, a stacking rack 32, a plurality of stacking plates 33 and an auxiliary valve core 37. The stacking rack 32 is coaxially arranged in the outer cylinder 31. The plurality of stacking plates 33 are annular sheet structures. The stacking plates 33 are stacked and sleeved on the outside of the stacking rack 32. The outer cylinder 31 is located on the outer side of the stacking rack 32 to form an outer cavity 35. The top of the outer cavity 35 forms an outer port 35a, and the bottom of the outer cavity 35 forms a drain port 36. The stacking rack 32 forms an inner cavity 34. The top of the inner cavity 34 forms an inner port 34a. The circumference of the inner cavity 34 forms a flow groove 323b to communicate with the outer cavity 35 through the flow groove 323b. The auxiliary valve core 37 is installed at the drain port 36 to realize the opening and closing of the drain port 36.

[0049] Combination Fig.10 The auxiliary valve core 37 includes an auxiliary stator 372 and an auxiliary movable plate 371. The auxiliary stator 372 is fixedly installed at the drain outlet 36, and is provided with a valve hole connected to the drain outlet 36. The auxiliary movable plate 371 is plane-sealed and coaxially rotatably arranged on the auxiliary stator 372 to open or close the valve hole on the auxiliary stator 372 to realize the opening and closing of the drain outlet 36.

[0050] When the filter assembly 3 is installed, the outer port 35a at the top of the outer cylinder 31 is connected to the outer cavity interface 1e' at the bottom of the valve body 1, so that the lower cavity 1e is connected to the outer cavity 35 of the filter assembly 3, and the inner port 34a at the top of the stacking rack 32 is connected to the inner cavity interface 11c' at the bottom of the valve body 1, so that the filter element inner cavity flow channel 11c in the valve body 1 is connected to the inner cavity 34 of the filter assembly 3.

[0051] The valve stem 15 serves as a synchronous linkage part of the main valve core 2 and the auxiliary valve core 37, and passes through the shift fork 14, the main valve core 2, the valve core seat 11, the inner cavity 34 and the auxiliary valve core 37 in sequence. The shift fork 14, the active plate 22 and the auxiliary moving plate 371 are fixedly connected. When the shift fork 14 rotates, the active plate 22 and the auxiliary moving plate 371 are driven to rotate synchronously through the valve stem 15 to realize flow channel regulation.

[0052] The high-efficiency backwashing multi-layer laminated sheet 33-type pre-filter of the present invention has three working modes, including:

[0053] In filtering mode, the active plate 22 rotates to the filtering mode position. At this time, the blind hole 22b on the active plate 22 connects the second through hole 21b and the upper part of the third through hole 21c on the main stator 21, so that the filter element inner cavity flow channel 11c and the upper part of the outlet flow channel 11b are connected, and the fourth through hole 22a is connected with the first through hole 21a, so that the water inlet pipe 11a', the water inlet flow channel 11a, the upper cavity 1d, the one-way valve 13, the lower cavity 1e, the outer cavity 35 of the filter assembly 3, the inner cavity 34, the filter element inner cavity flow channel 11c, the outlet flow channel 11b, and the outlet pipe 11b' are connected in sequence; the auxiliary valve core 37 is in a closed state, that is, the drain port 36 is closed. As a result, external raw water flows in from the water inlet pipe 11a', enters the upper chamber 1d through the water inlet channel 11a, and then enters the lower chamber 1e through the one-way valve 13, and then enters the outer chamber 35 of the filter assembly 3, is filtered by a number of stacked sheets 33 to form clean water and enters the inner chamber 34, and then flows back to the inner chamber flow channel 11c of the filter element, passes through the blind hole 22b into the water outlet channel 11b, and is discharged from the water outlet pipe 11b'. This mode is a conventional water purification treatment mode, so that the raw water is filtered to generate clean water.

[0054] In the backwash mode, the active plate 22 rotates to the backwash mode position. At this time, the blind hole 22b on the active plate 22 connects the first through hole 21a and the upper part of the third through hole 21c on the main fixed plate 21, so that the water inlet channel 11a is connected to the upper part of the inner cavity channel 11c of the filter element, the fourth through hole 22a is connected to the second through hole 21b, the auxiliary valve core 37 is in an open state, and the drain port 36 is opened, so that the water inlet pipe 11a', the water inlet channel 11a, the inner cavity 34, the outer cavity 35, and the lower cavity 1e of the filter assembly 3 are connected, and the raw water enters the water inlet pipe 11a' After passing through the flow channel 11a, the sewage enters the filter element inner cavity flow channel 11c through the blind hole 22b and enters the inner cavity 34, and then passes through the flow groove 323b to enter the outer cavity 35, thereby flushing the multi-layer laminate 33. The sewage after flushing is discharged from the drain port 36 at the bottom, and the backwash water can be filled into the lower cavity 1e from the outer cavity 35. However, since a one-way valve 13 is provided between the lower cavity 1e and the upper cavity 1d, the sewage will not enter the upper cavity 1d from the lower cavity 1e and then be discharged through the outlet flow channel 11b, that is, the outlet pipe 11b' will not drain water at this time, and the sewage will only be discharged from the drain port 36.

[0055] In bypass mode, the active plate 22 rotates to the bypass mode position. At this time, the blind hole 22b on the active plate 22 connects the first through hole 21a and the upper part of the second through hole 21b on the main fixed plate 21, so that the water inlet channel 11a is directly connected to the water outlet channel 11b, and the fourth through hole 22a is correspondingly connected to the third through hole 21c, so that the water inlet pipe 11a' is directly connected to the water outlet pipe 11b'. The raw water flows into the water inlet channel 11a from the water inlet pipe 11a', enters the water outlet channel 11b through the blind hole 22b, and is directly discharged from the water outlet pipe 11b'. That is, at this time, the raw water does not pass through the filter component 3, but only serves to pass water. At this time, the internal pressure of the filter component 3 is released and is in a waterless state, thereby achieving the purpose of releasing the internal pressure of the filter component 3, and the filter component 3 can be directly disassembled to achieve manual cleaning and disassembly of the filter component 3 and cleaning of stubborn dirt under uninterrupted water supply.

[0056] In summary, the present invention adopts two pairs of planar sealing linkage structures, and uses four valve plates, two of which are fixed, and the other two can be rotated by external force to achieve linkage, thereby switching the flow channel, realizing the functions of filter filtering, bypassing, and backwashing, and improving practicality.

[0057] See also Figure 6 , 7 In this embodiment, in order to achieve a better cleaning effect on the stack 33 in the backwash mode, in this embodiment, the stack frame 32 includes an upper round seat 321, a stack support seat 322 and a tube 323. The top of the upper round seat 321 forms the inner port 34a. The tube 323 is fixedly installed at the bottom of the upper round seat 321. The tube 323 can be set to three, four or five. In this embodiment, four tubes 323 are taken as an example. The four tubes 323 are evenly distributed in an annular direction at the bottom of the upper round seat 321. The stack support seat 322 is provided with a plurality of tubes 323, each of which is provided with a plurality of tubes 323. 2 is movably arranged below the tube 323, and the four tubes 323 and the laminated support seat 322 together enclose the inner cavity 34, and the flow groove 323b is formed between the adjacent tubes 323. A spring 38 is arranged between the laminated support seat 322 and the bottom of the outer tube 31, and the spring 38 presses the laminated support seat 322 upward and squeezes the plurality of laminated sheets 33 sleeved on the outer periphery of the tube 323 tightly. The laminated support seat 322 is provided with a hole for the valve stem 15 to pass through, and the laminated support seat 322 slides up and down in a sealed manner relative to the valve stem 15.

[0058] In the filtering mode, the outer cavity 35 is in a positive pressure state, and the stack support seat 322 presses the plurality of stacks 33 upward and compacts them under the action of the external positive pressure and the elastic tension of the spring 38, and gaps are formed between adjacent stacks 33 for raw water to pass through. The raw water is filtered by the plurality of stacks 33 to form clean water and enters the inner cavity 34 through the flow groove 323b, and is then discharged from the outlet pipe 11b'; in the backwash mode, the inner cavity 34 is in a positive pressure state, and the positive pressure water in the inner cavity 34 overcomes the elastic force of the spring 38 and causes the stack support seat 322 to move downward, thereby causing the plurality of stacks 33 to be in a relaxed state, and the positive pressure water flows from the inner cavity 34 to the outer cavity 35, and washes the dirt accumulated on the stacks 33 when they are in a relaxed state, and the generated sewage enters the outer cavity 35 and is discharged from the bottom drain port 36. Therefore, in the filtering state, the multi-layer laminate 33 is kept in a compressed state to achieve the required filtering accuracy. In the backwashing state, the multi-layer laminate 33 is in a relaxed state, increasing the interval between the laminates 33 to ensure smooth cleaning of dirt and improve the cleaning effect of the laminate 33.

[0059] In this embodiment, preferably, the tube 323 has a tube cavity 323a, the tube cavity 323a is open at the top and sealed at the bottom, the opening at the top of the tube cavity 323a is connected to the inner port 34a, and a plurality of jet holes 323a' are vertically opened on the circumference of the tube 323, and the hole axis direction of the jet hole 323a' extends toward the tangent direction of the circumference of the four tubes 323, and its function is that during backwashing, the raw water enters the filter assembly 3 from the inner port 34a in two ways, and enters the inner cavity 34a in one way. One of the water flows out from the flow grooves 323b between adjacent tubes 323 to the outer cavity 35 and rinses the laminate 33 in a relaxed state. The other way enters the tube cavity 323a from the top opening, and then jets out along the tangential direction of the circumference from multiple jet holes 323a' distributed from top to bottom on the side of the tube cavity 323a. The two streams of water produce impact turbulence at the laminate 33, thereby increasing the impact force on the laminate 33 and increasing the impact contact surface, so that the laminate 33 produces greater vibration, further improving the cleaning effect.

[0060] In the present embodiment, preferably, in order to further increase the water outlet pressure of the jet hole 323a' in the backwash mode and improve the jet flushing force on the laminate, a limiting flow valve core (not shown in the figure) is floatingly installed on the top of the inner cavity 34, and the limiting flow valve core makes the inner cavity 34 unidirectional from bottom to top. In the filtration mode, raw water enters the inner cavity 34 from the outer cavity 35, and the limiting flow valve core on the top is lifted up and flows upward through the inner port 34a; in the backwash mode, raw water flows in from the inner port 34a, and the top of the inner cavity 34 is blocked under the action of the limiting flow valve core, leaving only the tube cavity conductive, and the water flowing in from the inner port 34a enters the tube cavity 323a, and is then ejected from the jet hole 323a' along the tangential direction, thereby increasing the jet pressure to achieve high-intensity flushing of the laminate 33.

[0061] See also Fig.11In this embodiment, preferably, jet steps 33a are respectively provided on the upper and lower ends of the stack 33, and the end face of the jet step 33a faces the center of the stack 33. The raw water passes through the jet hole 323a' and flows outward at high pressure along the tangent direction of the circle where the four tubes 323 are located, and acts on the jet step 33a on the stack 33. The jet step 33a causes the stack 33 to be subjected to tangential impact force under the impact force of the raw water, and causes the stack 33 to rotate rapidly around its central axis, thereby causing the stack 33 to rotate relative to the stack 33 to achieve a scrubbing effect. With the impact of the water flow, more than 95% of the accumulated dirt on the stack 33 can be scrubbed and removed, so that the stack 33 is in a clean state again, and the filtering effect of repeated use is improved. In addition, with the drainage port 36 arranged at the bottom, the smooth flow channel can not only easily discharge dirt, but also generate a certain negative pressure, so that the scrubbing effect of the stack 33 is better.

[0062] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "include..." or "comprise..." do not exclude the existence of other elements in the process, method, article or terminal device including the elements. In addition, in this article, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself.

[0063] Although the above embodiments have been described, once those skilled in the art know the basic creative concepts, they can make additional changes and modifications to these embodiments. Therefore, the above description is only an embodiment of the present invention and does not limit the patent protection scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A backwash multi-layer laminated pre-filter, comprising a valve body, a main valve core, a filter assembly and a valve stem, wherein a valve core seat is arranged in the valve body, and characterized in that: An upper cavity and a lower cavity are arranged in the valve body, a one-way valve for one-way flow to the lower cavity is arranged between the upper cavity and the lower cavity, three flow channels including a water inlet flow channel, a filter inner cavity flow channel and a water outlet flow channel are arranged in the valve core seat, and the three flow channel upper ports of the water inlet flow channel, the water outlet flow channel and the filter inner cavity flow channel are all formed on the top of the valve core seat, the other end of the water inlet flow channel is connected to the water inlet pipe, and the other end of the water outlet flow channel is connected to the water outlet pipe; The main valve core is arranged on the valve core seat, and is used to make the upper parts of any two flow channels on the valve core seat conduct. The filter assembly includes an outer cylinder, a lamination rack, a plurality of laminations and an auxiliary valve core, wherein the lamination rack is coaxially arranged in the outer cylinder, and a plurality of laminations are stacked and sleeved on the outside of the lamination rack. The outer cylinder is located on the outside of the lamination rack to form an outer cavity, and the outer cavity is communicated with the lower cavity. A drain port is provided at the bottom end of the outer cavity. An inner cavity is formed inside the lamination rack, and the inner cavity is communicated with the inner cavity flow channel of the filter element. A flow groove is formed on the peripheral side of the inner cavity. The auxiliary valve core is installed at the drain port to realize the opening and closing of the drain port. The valve stem passes through the main valve core, the valve core seat, the inner cavity and the auxiliary valve core in sequence and is rotatably arranged so that the main valve core and the auxiliary valve core can be adjusted synchronously; The main valve core includes an active plate and a main stator plate, the main stator plate is fixedly mounted on the valve core seat, the active plate and the main stator plate are planarly sealed and coaxially rotated, the main stator plate is respectively provided with three through holes connected with the water inlet flow channel, the water outlet flow channel and the filter element inner cavity flow channel in sequence, the active plate is provided with a blind hole, the blind hole can make the upper parts of any two adjacent through holes on the main stator plate conduct, and the active plate is fixedly connected to the valve stem; The auxiliary valve core includes an auxiliary fixed plate and an auxiliary movable plate. The auxiliary fixed plate is fixedly installed at the drain outlet and is provided with a valve hole connected to the drain outlet. The auxiliary movable plate is plane-sealed and coaxially rotatably arranged on the auxiliary fixed plate. The auxiliary movable plate is fixedly connected to the valve stem. The three through holes on the main stator are all arc-shaped through holes and are distributed in three equal parts in the annular direction.

2. The backwashing multi-layer laminated pre-filter according to claim 1 is characterized in that: It also includes a shift fork, which is rotatably mounted on the valve body and placed in the upper cavity, the active plate is fixedly mounted on the bottom of the shift fork, and the shift fork is fixedly connected to the valve stem.

3. The backwashing multi-layer laminated pre-filter according to claim 1 is characterized in that: The blind hole on the active sheet is an arc-shaped hole occupying two-thirds of the circumference, and the active sheet is also provided with an arc-shaped through hole occupying one-third of the circumference.

4. The backwashing multi-layer laminated pre-filter according to claim 1 is characterized in that: The stacking frame includes an upper round seat, a stacking support seat and a tube. The top of the upper round seat forms an inner port connected to the inner cavity flow channel of the filter element. A plurality of tubes are fixedly installed at the bottom of the upper round seat and are evenly distributed in a circumferential direction. The stacking support seat is movably arranged below the tube. A plurality of tubes and the stacking support seat together enclose the inner cavity. The flow groove is formed between adjacent tubes. A spring is arranged between the stacking support seat and the bottom of the outer tube. The spring squeezes the stacking support seat upward and squeezes a plurality of stacks sleeved on the outer periphery of the tube tightly.

5. The backwashing multi-layer laminated pre-filter according to claim 4 is characterized in that: The tube has a lumen with an opening at the top and a sealed bottom. The opening at the top of the lumen is connected to the inner port. A plurality of jet holes are vertically opened on the circumference of the tube. The axis of the jet holes extends toward the tangent direction of the circle where the tubes are located.

6. The backwashing multi-layer laminated pre-filter according to claim 5 is characterized in that: A flow limiting valve core which conducts one way from bottom to top is installed in a floating manner on the top of the inner cavity.

7. The backwashing multi-layer laminated pre-filter according to claim 6 is characterized in that: The upper and lower ends of the laminate are respectively provided with jet steps, and the end faces where the jet steps are located face the center direction of the laminate.

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