Multifunctional filter

Abstract

The utility model provides a multifunctional filter and belongs to the technical field of filtration. The problem of how to avoid interference in installation of the filter is solved. A water inlet and a water outlet are formed in the outer wall of the top of the shell, the filter screen is fixed into the shell, the reversing piece is rotationally connected into the shell, a first overflowing hole and a third overflowing hole are formed in the side wall of the reversing piece, a filter groove with an opening in the top and a water passing channel are formed in the filter screen, and the two ends of the water passing channel penetrate through the filter groove and communicate with an inner cavity of the shell. The bottom of the reversing part is provided with a second flow passing hole communicated with the water passing channel and the first flow passing hole, the reversing part is internally provided with a flow passing groove communicated with the third flow passing hole and the filtering groove, the top of the shell is provided with a water drainage opening, and the side wall of the reversing part is provided with a fourth flow passing hole communicated with the flow passing groove. The outer wall of the reversing piece blocks the water outlet, the fourth overflowing hole is communicated with the water inlet, and the first overflowing hole is communicated with the water outlet. The multifunctional filter can avoid interference in installation of the filter.

Description

TECHNICAL FIELD

[0001] The utility model belongs to filter technical field relates to a multifunctional filter. BACKGROUND

[0002] Filter is the prior art common filter device, it mainly to tap the use before playing a filtering effect to tap tap water quality, ensure, such as Chinese patent (grant announcement number: CN106823535B) discloses a prefilter, including reversing valve, the reversing valve includes valve core, connecting pipe and valve cover, the valve core includes valve body, first connecting body and second connecting body, the first connecting body with the second connecting body opposite setting, and fixed respectively in both sides of the valve body, the cup body is equipped with the cavity that communicates with the through hole, the inner wall of the cavity is equipped with the convex ridge and the filter core assembly that can be set in the cavity of the cup body, the rotation of the valve body guides the water flow to enter the filter core assembly and carries out the filtration or is used for cleaning the filter core assembly.

[0003] Combining the drawings of the specification Figure 1 And Figure 2 It can be known that, when the prefilter is working normally, a user twists the force applying part, so that the valve body rotates by a certain angle, so that the third connecting hole is communicated with the through hole and the cavity in the cup body, and so that the fifth connecting hole is communicated with the fourth connecting hole through the first connecting hole, the second inlet and outlet, at this time, as shown in the figure, water enters the cup body through the first joint and is delivered, and impurities in the water are filtered through the filter screen and the inner core, and then the water is discharged outward from the second joint through the fifth connecting hole, the first connecting hole, the second inlet and outlet, and the fourth connecting hole. Figure 1 Conversely, when cleaning is performed, the user twists the force applying part, so that the valve body rotates by a certain angle, so that the first inlet and outlet are communicated with the third connecting hole, and water is input into the filter core assembly through the second inlet and outlet and the first connecting hole after entering the first channel of the valve body, and the impurities attached to the outside of the filter screen are washed off by the water, and the water accumulated in the cup body is discharged to the outside after the user opens the switch valve.

[0004] However, in order to complete the sewage discharge work, the prefilter needs to be installed with a switch valve structure at the bottom of the cup body, which will inevitably make the prefilter longer, and it is very likely that the installation will be inconvenient due to the size not meeting the installation space. SUMMARY

[0005] The utility model aims at the above problems existing in the prior art, and provides a multifunctional filter, and the technical problem to be solved by the utility model is how to avoid interference during installation of the filter.

[0006] The utility model discloses a top opening filter groove and water passage that are communicated with the overflow hole three in the reversing piece, and the water passage is communicated with the overflow hole two and the overflow hole one in the reversing piece, and the reversing piece is rotated clockwise or counterclockwise and positioned, and the outer wall of the reversing piece blocks the inner end port of the water outlet, the overflow hole four is communicated with the water inlet, and the overflow hole one is communicated with the drain port.

[0007] The working principle of the multifunctional filter is as follows: when normal water inlet filtering is needed, the user controls the rotation of the reversing piece by a certain amplitude to make the water inlet and the flow hole one on the reversing piece communicate, at the same time, the flow hole three communicates with the water outlet, the external water source continuously supplies water to the water inlet, the water flows from the water inlet and enters through the flow hole one and the flow hole two, and enters the shell through the water passage of the filter screen, under the action of gravity, the water continuously fills the shell and fills the internal cavity, at the same time, due to the existence of the filter screen, the impurities in the water are effectively filtered through the large number of filter holes on the outer wall, the filtered water is left in the filter groove of the filter screen, and under the action of subsequent water pressure, the water left in the filter groove enters through the flow groove at the bottom of the reversing piece, then passes through the reversing piece and passes through the flow hole three to the water outlet of the shell, and finally the filtered water is discharged through the water outlet, and the impurities obtained by filtering are left in the shell (attached to the outer wall of the filter screen), conversely, when cleaning is performed, the user also rotates the reversing piece, this time the rotation makes the water outlet be blocked by the outer wall of the reversing piece, at this time, the water inlet of the shell is connected through the flow hole four, the water outlet of the shell is connected through the flow hole one, the water still enters through the water inlet, but the entering water enters the reversing piece through the flow hole four and is discharged to the filter groove of the filter screen through the flow groove, under the impact of the water flow, the filter screen is continuously scoured, so that the impurities attached to the outer wall of the filter screen fall off, as the water in the shell becomes more and more, the water carrying impurities enters the reversing piece through the water passage and the flow hole two in turn, and is discharged outward through the flow hole one and the water outlet, compared with the prior art, the application can change the conveying direction of the water in the shell by controlling the reversing piece, without other operations, both filtering of the water and effective cleaning of the impurities in the filter can be achieved, the use is more convenient, at the same time, the sewage generated by washing the filter core in the shell is discharged through the water outlet on the top outer wall of the shell and the reversing piece, without installing other control valve structures on the shell, the length of the filter can be effectively controlled, the installation feasibility can be effectively guaranteed, the manufacturing cost of the filter can also be controlled, in addition, when the user controls the reversing piece to block the water inlet with the outer wall, the input water flow is blocked outside the shell, so as to achieve the effect of cutting off the flow channel, the function is more diversified.

[0008] In the multifunctional filter, the filter screen comprises a cylindrical body, the filter groove is formed inside the body, the filter screen further comprises a water passing pipe fixed to the inner bottom wall of the filter groove and penetrating through the bottom of the body, the water passing channel is formed in the water passing pipe, the shell comprises a valve body at the top and a valve cover screwed to the bottom of the valve body, the inner wall of the valve cover is provided with a abutting rib along the circumference near the opening, the top edge of the body is provided with an outwardly folded flange, and the flange abuts against the abutting rib and is pressed by the valve body. Through the structural design of the filter screen, the filter screen is matched with the reversing element to realize the switching of the water path in different modes. The valve body is used to accommodate the reversing element and connect the water pipe. The cavity for storing water and mounting the filter screen is formed in the shell by the cooperation of the valve body and the valve cover. The body and the valve cover are matched by the cooperation of the abutting rib and the flange, and the valve body and the valve cover are screwed and pressed, so that the filter screen can be fixed in the valve cover and the assembly stability is ensured, and the filtering effect is ensured.

[0009] In the multifunctional filter, the bottom of the valve body is screwed with a positioning seat below the reversing element, the middle of the positioning seat is provided with a cylindrical pipe-shaped communication part, the overflow hole two is communicated with the upper end of the communication part, the water passing pipe is connected and fixed with the lower end of the communication part, and a plurality of water passing holes are arranged on the positioning seat along the circumference and surround the communication part, and the plurality of water passing holes are communicated with the overflow groove and the filter groove. Through the positioning seat, the water passing pipe in the body and the communication part are clamped and matched, the mounting stability of the filter screen is further improved, and in the filtering mode, water is communicated to the valve cover through the communication part, and in the cleaning mode, water is communicated to the inside of the filter screen through the water passing hole, so that the water flow is input in different paths in different modes of the filter.

[0010] In the multifunctional filter, the water inlet, the water outlet and the drain are arranged on the outer wall of the valve body, the detection port is arranged on the outer wall of the valve body, the main plug is screwed in the detection port, the connecting hole communicated with the detection port is arranged on the main plug, and the vice plug is screwed on the main plug to block the connecting hole. The filter comprises a valve body, a water inlet, a water outlet and a drain, and a detection port is arranged on the valve body. In the normal use state, the main plug and the vice plug are blocked. When the water pressure in the shell needs to be detected, the vice plug is removed and the detection end of the detection meter is arranged in the connecting hole.

[0011] In the multifunctional filter, the water inlet, the water outlet, the drain port and the detection port are arranged in a circumferential interval along the outer wall of the valve body, the water inlet and the water outlet are opposite, and the drain port and the detection port are opposite, the flow hole one, the flow hole three and the flow hole four are arranged in a circumferential interval of 90 degrees along the reversing piece. The water inlet, the water outlet, the drain port and the detection port are arranged in a circumferential interval along the valve body, and the interval is 90 degrees. Meanwhile, the flow hole one, the flow hole three and the flow hole four are arranged in a circumferential interval of 90 degrees along the reversing piece. That is to say, when the reversing piece is in a state of rotation of 0 degrees, the filter is in a normal filtering state. When the reversing piece is in a state of clockwise rotation of 90 degrees, the filter is in a cleaning state. When the reversing piece is in a state of counterclockwise rotation of 90 degrees, the filter is in a state of cutting off the flow channel. The operation is more clear and simple.

[0012] In the multifunctional filter, the valve body top is rotationally provided with a valve rod fixedly connected with the reversing piece. The valve body is provided with a handle fixedly arranged in a circumferential interval with the valve rod, and the handle can axially slide relative to the valve rod. The outer wall of the valve body top has a limiting block protruding outward. The handle is provided with a limiting groove one and a limiting groove two in a circumferential interval. The limiting groove one and the limiting groove two are arranged in an axial interval along the valve rod. The limiting groove one and the limiting groove two are both arc-shaped grooves, and the central angles of the arcs are both 90 degrees. The limiting block one is slidably connected in the limiting groove one or the limiting groove two. The reversing piece is rotationally controlled by the handle. Since the limiting groove one or the limiting groove two is matched with the limiting block on the outer wall of the valve body top, and the handle needs to be pulled or pressed by the user when switching between the filtering state and the cleaning state, the handle can be rotated by an angle of 90 degrees each time, which ensures the switching between the working states of the filter to be more accurate and ensures the operation to be more convenient.

[0013] In the multifunctional filter, the handle is T-shaped and internally vertically provided with a plug-in hole, the valve rod is inserted into the plug-in hole and locked in the circumferential direction by a fastener, the lower end of the handle is circumferentially provided with a sleeve slot around the plug-in hole, the limiting slot one and the limiting slot two are located above the sleeve slot, the valve body top is provided with a boss part one and a boss part two in concentric arrangement, the boss part one has a larger outer diameter than the boss part two, the limiting block is formed on the outer wall of the boss part two, and the handle is sleeved on the outer wall of the boss part one through the sleeve slot and forms an axial movable gap between the handle and the top surface of the boss part one. The handle is specifically sleeved on the outer wall of the valve body through the sleeve slot, the sleeve slot inner wall and the boss part one outer wall are matched to limit the handle in the circumferential direction, the plug-in hole, the fastener and the valve rod are matched to stabilize the connection between the handle and the valve rod in the circumferential direction, and the axial movable gap between the handle and the boss part one ensures that the handle can slide axially relative to the valve rod, so that the limiting block can slide in the limiting slot one or the limiting slot two, and the purpose of switching the filter working mode is achieved.

[0014] In the multifunctional filter, the handle is T-shaped and internally vertically provided with a plug-in hole, the valve rod is inserted into the plug-in hole and locked in the circumferential direction by a fastener, the lower end of the handle is circumferentially provided with a sleeve slot around the plug-in hole, the limiting slot one and the limiting slot two are located above the sleeve slot, the valve body top is provided with a boss part one and a boss part two in concentric arrangement, the boss part one has a larger outer diameter than the boss part two, the limiting block is formed on the outer wall of the boss part two, and the handle is sleeved on the outer wall of the boss part one through the sleeve slot and forms an axial movable gap between the handle and the top surface of the boss part one. The handle is specifically sleeved on the outer wall of the valve body through the sleeve slot, the sleeve slot inner wall and the boss part one outer wall are matched to limit the handle in the circumferential direction, the plug-in hole, the fastener and the valve rod are matched to stabilize the connection between the handle and the valve rod in the circumferential direction, and the axial movable gap between the handle and the boss part one ensures that the handle can slide axially relative to the valve rod, so that the limiting block can slide in the limiting slot one or the limiting slot two, and the purpose of switching the filter working mode is achieved.

[0015] Compared with the prior art, the multifunctional filter has the following advantages: the cooperation of the flow holes one, two, three and four and the flow groove on the reversing piece and the water inlet, water outlet and drain on the shell ensures that the filter can realize the functions of filtering water, cleaning the filter screen and cutting off the flow channel only by rotating the reversing piece, ensures the convenience of operation, effectively reduces the length of the filter, effectively prevents interference during installation and reduces the manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the multifunctional filter.

[0017] Figure 2 is a sectional view of the filter in the filtering mode.

[0018] Figure 3 is Figure 2 is an enlarged view of part A in

[0019] Figure 4 is a sectional view of the filter in the cleaning mode.

[0020] Figure 5 is Figure 4 is a partial enlarged view of B in the middle.

[0021] Figure 6 is another perspective view of the filter in the cleaning mode.

[0022] Figure 7 is a sectional view of the filter in the flow channel cutting-off mode.

[0023] Figure 8 is Figure 7 is a partial enlarged view of C in the middle.

[0024] Figure 9 is a structural schematic view of the filter screen and a partial enlarged view thereof.

[0025] Figure 10 is a structural schematic view of the reversing piece.

[0026] Figure 11 is a structural schematic view of the valve body.

[0027] Figure 12 is a bottom view of the handle.

[0028] Figure 13 is a structural schematic view of the positioning seat.

[0029] Figure 14 is a structural schematic view of the valve cover and a partial enlarged view thereof.

[0030] in the drawings,

[0031] 1, housing; 11, water inlet; 12, water outlet; 13, filter screen; 131, flange; 132, water passage; 133, filter groove; 134, body; 135, water pipe; 14, drain port; 15, valve body; 151, positioning seat; 1511, communication part; 1512, water passage hole; 152, valve rod; 153, limiting block; 154, boss part one; 155, boss part two; 16, valve cover; 161, abutting edge; 17, detection port; 171, main plug; 1711, connecting hole; 1712, auxiliary plug;

[0032] 2, reversing piece; 21, flow hole one; 22, flow hole three; 23, flow hole two; 24, flow groove; 25, flow hole four;

[0033] 3, handle; 31, limiting groove one; 32, limiting groove two; 33, insertion hole; 34, sleeving groove; 35, annular groove; 351, spring;

[0034] 4, axial movable gap. DETAILED DESCRIPTION

[0035] The utility model discloses the specific embodiment of the utility model is as follows and further describes the technical scheme of the utility model in connection with the drawings, but the utility model is not limited to these embodiments.

[0036] As Figure 1 , Figure 2 , Figure 11 And Figure 14 As shown in the figure, the multi-functional filter includes a shell 1, the shell 1 includes a valve body 15 and a valve cover 16 fixedly connected to the bottom of the valve body 15, the outer wall of the valve body 15 is provided with a water inlet 11, a water outlet 12, a drain 14 and a detection port 17 along the circumference, the four are arranged at intervals along the valve body 15, and the interval between the adjacent two ports is 90 degrees, a reversing piece 2 is rotatably connected between the water inlet 11, the water outlet 12, the drain 14 and the detection port 17 in the valve body 15, and the inner end of the water inlet 11, the water outlet 12, the drain 14 and the detection port 17 is clamped with an annular plug capable of abutting against the outer wall of the reversing piece 2 to realize sealing, a main plug 171 is fixedly connected in the detection port 17 to block the outer end port of the detection port 17, a connecting hole 1711 is formed in the main plug 171 and communicated with the inner end of the detection port 17, and a secondary plug 1712 is fixedly connected in the connecting hole 1711 to block the connecting hole 1711, a valve rod 152 is rotatably connected to the top of the valve body 15, the lower end of the valve rod 152 extends into the valve body 15 and is clamped and fixed with the clamping groove formed in the top of the reversing piece 2, and the upper end of the valve rod 152 extends out of the valve body 15.

[0037] In combination Figure 12 , the top of the valve body 15 is provided with a T-shaped handle 3, the bottom of the handle 3 is provided with a sleeving groove 34 along the circumference, the top of the valve body 15 has a disc-shaped boss part one 154 and a boss part two 155, which are concentrically arranged and the outer diameter of the boss part one 154 is larger than that of the boss part two 155, the handle 3 is sleeved on the outer side of the boss part one 154 through the sleeving groove 34 and the inner side wall thereof is in close contact with the outer side wall of the boss part one 154, an insertion hole 33 is vertically formed in the handle 3 and extends through both ends thereof, the upper end of the valve rod 152 is inserted into the insertion hole 33 and locked by a screw, it is worth mentioning that the upper end of the valve rod 152 and the insertion hole 33 are both non-circular, so that after the two are inserted, the circumferential positioning of the handle 3 and the valve rod 152 can be realized by the cooperation of the hole walls, and the insertion hole 33 has an annular stop along the circumference, so that after the screw is screwed with the valve rod 152, the axial connection stability of the two is ensured, in addition, the distance between the annular stop and the outer end port of the insertion hole 33 is greater than the height of the axial movement gap 4 between the groove bottom wall of the sleeving groove 34 and the top surface of the boss part one 154, so as to prevent the screw from being exposed.

[0038] The outer side wall of the boss part one 154 has an outward protruding limiting block 153, and the inner side of the handle 3 above the sleeve connecting groove 34 is axially provided with a limiting groove one 31 and a limiting groove two 32 which are connected at one end and are arranged in a staggered manner along the axial direction of the handle 3, and the limiting groove one 31 and the limiting groove two 32 are both arc-shaped grooves and the corresponding central angles of the arcs are both 90 degrees, that is, the sum of the corresponding central angles of the arcs of the limiting groove one 31 and the limiting groove two 32 is 180 degrees, the limiting block 153 is slidably connected in the limiting groove one 31 and transitions to the limiting groove two 32, and vice versa, and the inner side wall of the handle 3 above the limiting groove one 31 and the limiting groove two 32 is provided with an annular groove 35 surrounding the plug-in hole 33, and a spring 351 is embedded in the annular groove 35, one end of the spring 351 abuts against the inner bottom wall of the annular groove 35, and the other end abuts against the top surface of the boss part one 154.

[0039] In combination Figure 9 With Figure 13 The bottom of the valve body 15 below the reversing part 2 is screw-connected and fixed with a positioning seat 151, the middle part of the positioning seat 151 has a communicating part 1511 which is downwardly inserted into the valve cover 16 and is in a cylindrical tubular shape, an limiting groove is axially arranged at the upper end of the communicating part 1511, and a sealing groove in which a sealing ring is embedded is arranged on the inner side wall of the limiting groove, the lower end of the reversing part 2 is embedded in the limiting groove and abuts against the sealing ring, so that the overflow hole two 23 and the upper end of the communicating part 1511 are communicated, and the filter screen 13 specifically includes a body 134 which is in a cylindrical shape, the body has a filtering groove 133 which is in an open top, and a water passing pipe 135 is integrally formed in the body 134 in a vertical direction, the water passing pipe 135 has a water passing channel 132 inside, the lower end of the water passing pipe 132 penetrates through the bottom of the body 134 and is arranged so that the lower end of the water passing channel 132 communicates with the cavity inside the valve cover 16, and the upper end of the water passing channel 132 is clamped with the lower end of the communicating part 1511, so that the water passing channel 132 is communicated with the overflow hole two 23 through the communicating part 1511, the upper end outer edge of the body 134 has an outwardly folded flange 131 in a circumferential direction, the open end of the valve cover 16 has an abutting rib 161 in a circumferential direction, and the body 134 abuts against the abutting rib 161 through the circumferential flange 131, when the valve body 15 and the valve cover 16 are screw-connected and tightly fixed, the lower end surface outer edge of the valve body 15 can press the flange 131 on the abutting rib 161, and a plurality of water passing holes 1512 which are in a strip shape and are curved in an arc shape are arranged around the communicating part 1511 on the positioning seat 151, and the water passing holes 1512 communicate the filtering groove 133 and the overflow groove 24.

[0040] The working of the multifunctional filter is divided into three states, which are a filtering mode, a cleaning mode and a cut-off flow channel mode.

[0041] For the filtering mode, as Figure 2 With Figure 3As shown, the user does not need to rotate the handle 3, at this time the limiting block 153 is embedded in the limiting groove one 31 under the elastic force of the spring 351 and abuts against the inner wall of one end of the limiting groove two 32, in this state, the overflow hole one 21 is opposite to the water inlet 11, the overflow hole three 22 is opposite to the water outlet 12, and the overflow hole four 25 is opposite to the detection port 17 (because of the existence of the main plug 171 and the auxiliary plug 1712, the overflow hole four 25 is in a blocked state), at this time, the external water flow enters the overflow hole one 21 and the overflow hole two 23 of the reversing piece 2 through the water inlet 11, and enters the valve cover 16 through the communication part 1511 and the water passage 132, with the continuous inflow of water flow, the water flow that has entered enters the filter groove 133 through the small holes on the filter screen 13 under the action of the subsequent water pressure, is filtered by the filter screen 13, and the filtered water enters the overflow groove 24 of the reversing piece 2 through the water flow hole 1512 under the action of the subsequent water pressure, transitions to the overflow hole three 22 through the overflow groove 24, and is finally discharged outward through the water outlet 12 on the valve body 15.

[0042] As shown in the cleaning mode, on the basis of the filtering mode, Figures 4-6 As shown, on the basis of the filtering mode, the user presses the handle 3 to overcome the elastic force of the spring, so that the limiting block 153 slides from the limiting groove one 31 to the limiting groove two, and the user rotates the handle 3 clockwise by ninety degrees, so that the limiting block 153 slides from one end of the limiting groove two to the other end, in this state, the overflow hole four 25 is opposite to the water inlet 11, the overflow hole one 21 is opposite to the drain 14, and the overflow hole three 22 is opposite to the detection port 17 (because of the existence of the main plug 171 and the auxiliary plug 1712, the overflow hole three 22 is in a blocked state), at this time, the external water flow enters the overflow hole three 22 of the reversing piece 2 through the water inlet 11, and enters the filter groove 133 through the overflow hole two 23, under the action of strong water pressure, the impurities attached to the outer wall of the filter screen 13 are washed off, thereby completing the cleaning of the filter screen 13, and the washed-off impurities enter the reversing piece 2 through the communication part 1511 and the overflow hole two 23 along with the water, and are finally discharged outward through the overflow hole one 21 and the drain 14.

[0043] As shown in the cleaning mode, on the basis of the filtering mode, Figure 7 As shown in the cleaning mode, on the basis of the filtering mode, Figure 8 As shown, on the basis of the cleaning mode, the user rotates the handle 3 counterclockwise by ninety degrees, so that the limiting block 153 slides from one end of the limiting groove one 31 to the other end, in this state, the overflow hole one 21 is opposite to the detection port 17, the overflow hole three 22 is opposite to the drain 14, and the overflow hole four 25 is opposite to the water outlet 12, and the water inlet 11 is blocked by the outer wall of the reversing piece 2, at this time, the external water flow cannot enter the shell 1 through the water inlet 11, thereby achieving the effect of cutting off the flow channel.

[0044] The specific embodiments described herein are merely illustrative of the present application. Various modifications or changes can be made to the specific embodiments described herein by those skilled in the art without departing from the spirit of the present application, or the scope of the appended claims.

[0045] Although the terms housing 1, water inlet 11, water outlet 12, filter screen 13, flange 131, water passage 132, filter groove 133, body 134, water passage pipe 135, water outlet 14, valve body 15, positioning seat 151, communication part 1511, water passage hole 1512, valve rod 152, limiting block 153, boss part one 154, boss part two 155, valve cover 16, abutting edge 161, detection opening 17, main plug 171, connecting hole 1711, secondary plug 1712, reversing element 2, flow passage one 21, flow passage three 22, flow passage two 23, flow groove 24, flow passage four 25, handle 3, limiting groove one 31, limiting groove two 32, insertion hole 33, sleeving groove 34, annular groove 35, spring 351, axial movable gap 4, etc. are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the present application; any interpretation of them as an additional limitation is contrary to the spirit of the present application.

Claims

1. A multifunction filter, comprising a shell (1) with a water inlet (11) and a water outlet (12) on the top outer wall, a filter screen (13) fixed in the shell (1), and a reversing piece (2) rotatably connected in the shell (1), the side wall of the reversing piece (2) is provided with a flow hole one (21) and a flow hole three (22), characterized in that, The filter screen (13) has a filter groove (133) with a top opening and a water passage (132) penetrating through both ends and communicating with the cavity in the shell (1), and the filter groove (133) is arranged around the water passage (132), the reversing piece (2) is provided with a second flow hole (23) communicating with the water passage (132) and the first flow hole (21), the reversing piece (2) has a flow groove (24) communicating with the third flow hole (22) and the filter groove (133), the shell (1) is further provided with a water outlet (14) on the top outer wall, and the reversing piece (2) is further provided with a fourth flow hole (25) on the side wall and communicating with the flow groove (24), when the reversing piece (2) rotates clockwise or counterclockwise and is positioned, the outer wall of the reversing piece (2) blocks the inner end port of the water outlet (12), the fourth flow hole (25) communicates with the water inlet (11), and the first flow hole (21) communicates with the water outlet (14).

2. The multifunction filter of claim 1, wherein The filter screen (13) includes a cylindrical body (134), the filter groove (133) is formed in the body (134), the filter screen (13) further includes a water passage pipe (135) fixed to the bottom wall in the filter groove (133) and penetrating through the bottom of the body (134), the water passage (132) is formed in the water passage pipe (135), the shell (1) includes a valve body (15) at the top and a valve cover (16) screwed and fixed at the bottom of the valve body (15), the inner wall of the valve cover (16) is provided with an abutting rib (161) near the opening in the circumferential direction, the top edge of the body (134) is provided with an outwardly folded flange (131), the flange (131) abuts against the abutting rib (161) and is pressed by the valve body (15).

3. The multifunctional filter according to claim 2, characterized in that, The bottom of the valve body (15) is screwed and fixed with a positioning seat (151) below the reversing piece (2), the positioning seat (151) has a cylindrical pipe-shaped communication part (1511) in the middle, the second flow hole (23) and the upper end of the communication part (1511) communicate, and the water passage pipe (135) and the lower end of the communication part (1511) are connected and fixed, the positioning seat (151) is provided with a plurality of water holes (1512) around the communication part (1511) in the circumferential direction, and a plurality of the water holes (1512) communicate the flow groove (24) and the filter groove (133).

4. The multifunction filter according to claim 2 or 3, characterized in that, The water inlet (11), the water outlet (12) and the water outlet (14) are all provided on the outer wall of the valve body (15), the outer wall of the valve body (15) is further provided with a detection port (17), the detection port (17) is screwed with a main plug (171), the main plug (171) is provided with a connecting hole (1711) communicating with the detection port (17), and the main plug (171) is screwed with a secondary plug (1712) blocking the connecting hole (1711).

5. The multifunctional filter according to claim 4, characterized in that, The water inlet (11), the water outlet (12), the drain port (14) and the detection port (17) are arranged along the outer wall of the valve body (15) circumferentially, the water inlet (11) and the water outlet (12) are opposite, and the drain port (14) and the detection port (17) are opposite, the flow hole one (21), the flow hole three (22) and the flow hole four (25) are opened along the reversing piece (2) circumferentially and spaced 90 degrees.

6. The multifunction filter according to claim 2 or 3, characterized by The valve body (15) is rotatably provided with a valve rod (152) fixedly connected with the reversing piece (2) at the top, the valve body (15) is provided with a handle (3) fixed circumferentially with the valve rod (152), the handle (3) can axially slide relative to the valve rod (152), the outer side wall of the top of the valve body (15) has a limiting block (153) protruding outward, a limiting groove one (31) and a limiting groove two (32) are opened in the handle (3) and connected in communication, the limiting groove one (31) and the limiting groove two (32) are arranged axially offset along the valve rod (152), the limiting groove one (31) and the limiting groove two (32) are both arc-shaped grooves and the central angles of the arcs are both 90 degrees, and the limiting block (153) is slidably connected in the limiting groove one (31) or the limiting groove two (32).

7. The multifunctional filter according to claim 6, characterized in that The handle (3) is T-shaped and internally vertically has a plug-in hole (33), the valve rod (152) is inserted into the plug-in hole (33) and circumferentially locked by a fastener, the lower end of the handle (3) circumferentially has a sleeve groove (34) arranged around the plug-in hole (33), the limiting groove one (31) and the limiting groove two (32) are located above the sleeve groove (34), the top of the valve body (15) has a boss part one (154) and a boss part two (155) arranged concentrically, the outer diameter of the boss part one (154) is larger than that of the boss part two (155), the limiting block (153) is formed on the outer wall of the boss part two (155), and the handle (3) is sleeved on the boss part one (154) through the sleeve groove (34) and forms an axial movable gap (4) between the top surface of the boss part one (154).

8. The multifunctional filter according to claim 7, characterized in that, The handle (3) internally located inside the limiting groove one (31) and the limiting groove two (32) has an annular groove (35) arranged around the plug-in hole (33), a spring (351) is embedded in the annular groove (35), and the spring (351) elastically acts between the bottom wall of the annular groove (35) and the top surface of the boss part two (155).

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