Pre-filter and water purifying device comprising the same

Abstract

The present application relates to water purification equipment technical field, specifically provide a kind of prefilter and the water purification device comprising the prefilter.The prefilter includes valve head shell, filter bottle shell, filter screen framework, filter screen, blowdown assembly and first cleaning assembly.Wherein, filter screen framework is fixed in the chamber of filter bottle shell;Filter screen is fixed on filter screen framework, and filter screen separates the chamber of filter bottle shell into first chamber and second chamber;Blowdown assembly is located in the other end of filter bottle shell;First cleaning assembly is located in second chamber, and first cleaning assembly includes first cleaning support of first framework rotationally connected with first framework, and brush and vane located on water-approaching side are provided on first cleaning support, and brush abuts on the inner wall of filter screen.Through such setting, when blowdown assembly is in the open state, water flow into second chamber impacts vane and then drives first cleaning support to rotate to make brush clean the inner wall of filter screen, improve the cleaning effect of prefilter.

Description

Technical Field

[0001] This invention relates to the field of water purification equipment technology, specifically providing a pre-filter and a water purification device including the pre-filter. Background Technology

[0002] The main function of existing household pre-filters is to intercept and filter particulate impurities, sediment, and rust in the water to prevent damage to water pipes and water-related equipment.

[0003] When using tap water pressure to flush a pre-filter, the water flow can only wash away large particles of impurities and sediment on the outer surface of the filter screen, and some impurities that are already embedded in the filter screen are not easily washed away. When flushing the pre-filter in reverse, the water flow is from the inside to the outside of the filter screen, and there is a problem that impurities can easily clog the inner surface of the filter screen. The flushing effect of the pre-filter is not ideal, and the user experience is poor.

[0004] Accordingly, there is a need in the field for a new pre-filter to address the aforementioned problems. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the existing technology, namely, to solve the problem of incomplete cleaning of the existing pre-filter screen.

[0006] In a first aspect, the present invention provides a pre-filter comprising: a valve head housing having a first flow channel and a second flow channel therein; a filter bottle housing having a chamber, one end of the filter bottle housing being sealed to the valve head housing; a filter screen frame fixed within the chamber of the filter bottle housing; a filter screen fixed to the filter screen frame, the filter screen dividing the chamber into a first chamber and a second chamber; the first chamber communicating with the first flow channel, and the second chamber communicating with the second flow channel; a drain assembly located at the other end of the filter bottle housing; and a first cleaning assembly located within the second chamber; wherein the first cleaning assembly includes a first cleaning bracket rotatably connected to the first frame, the first cleaning bracket being provided with a brush and blades located on the water-facing side, the end of the brush abutting against the inner wall of the filter screen; when the drain assembly is in the open state, the water flow entering the second chamber impacts the blades, thereby driving the first cleaning bracket to rotate so that the brush performs circumferential cleaning of the inner wall of the filter screen.

[0007] In the preferred embodiment of the pre-filter described above, the first frame includes a support shaft with a hollow structure and an annular connecting shell. The first cleaning bracket is sleeved on the support shaft. One side of the support shaft has a hollow connecting seat, which is fixedly connected to one end of the annular connecting shell. The other side of the support shaft is located in the second chamber. The other end of the annular connecting shell communicates with the second flow channel. A first water inlet is provided on the side wall of the annular connecting shell, and the first flow channel communicates with the first water inlet.

[0008] In the preferred embodiment of the pre-filter described above, the pre-filter further includes an annular flow guide cover, which is sleeved on the connecting seat of the support shaft and is snapped and fixed to the filter bottle housing. The annular flow guide cover is provided with a second water inlet, and the first flow channel communicates with the first chamber through the second water inlet.

[0009] In the preferred embodiment of the pre-filter described above, the sewage discharge assembly includes a sewage discharge valve body and an elastic telescopic interface located at one end of the sewage discharge valve body. The elastic telescopic interface is fixedly connected to the other end of the support shaft, and the connecting seat of the support shaft is axially movably connected to the annular flow guide cover. When the sewage discharge valve body is in the closed state, the elastic telescopic interface applies force along the axial direction of the support shaft, causing the annular connecting shell to enter the second flow channel to block the first water inlet.

[0010] In the preferred embodiment of the pre-filter described above, the annular guide shroud has an inner annular step, the second water inlet is formed on the annular step, the connecting seat of the support shaft has an annular edge, the annular edge is provided with a protrusion, and the protrusion is disposed toward the annular step.

[0011] In the preferred embodiment of the pre-filter described above, the annular flow guide is fixedly connected to one end of the filter screen frame.

[0012] In the preferred embodiment of the pre-filter described above, the first cleaning bracket is a cylindrical structure, and the first cleaning bracket is also provided with a third water inlet, and the support shaft is provided with a fourth water inlet; during the rotation of the first cleaning bracket, the third water inlet and the fourth water inlet are intermittently connected.

[0013] In the preferred embodiment of the pre-filter described above, the pre-filter further includes a second cleaning assembly located within the first chamber. The second cleaning assembly includes a second frame and a scraper disposed on the second frame. The scraper abuts against the outer wall of the filter screen and / or the scraper abuts against the inner wall of the filter bottle housing. The second frame rotates around the outer wall of the filter screen.

[0014] In the preferred embodiment of the pre-filter described above, one end of the second frame is fixedly connected to the drain valve body, and the drain valve body is rotatably and sealingly connected to the filter bottle housing.

[0015] In a second aspect, the present invention also provides a water purification device, which includes the aforementioned pre-filter.

[0016] Those skilled in the art will understand that the pre-filter of the present invention includes a valve head housing, a filter bottle housing, a filter screen frame, a filter screen, a drain assembly, and a first cleaning assembly. The valve head housing has a first flow channel and a second flow channel; the filter bottle housing has a chamber, and one end of the filter bottle housing is sealed to the valve head housing; the filter screen frame is fixed within the chamber of the filter bottle housing; the filter screen is fixed to the filter screen frame, and the filter screen divides the chamber into a first chamber and a second chamber; the first chamber communicates with the first flow channel, and the second chamber communicates with the second flow channel; the drain assembly is located at the other end of the filter bottle housing; the first cleaning assembly is located within the second chamber, and the first cleaning assembly includes a first cleaning bracket rotatably connected to the first frame, the first cleaning bracket being equipped with a brush and blades, the ends of the brush abutting against the inner wall of the filter screen. With this configuration, when the drain assembly is open, the water flow entering the second chamber impacts the blades, causing the first cleaning bracket to rotate, allowing the brush to perform circumferential cleaning of the inner wall of the filter screen, facilitating the removal of deposited particles on the inner wall of the filter screen and improving the overall cleaning effect of the pre-filter.

[0017] Furthermore, the first frame includes a hollow support shaft and an annular connecting shell. One end of the annular connecting shell communicates with the second flow channel. One side of the support shaft has a funnel-shaped hollow connecting seat, which is fixedly connected to the other end of the annular connecting shell. The other side of the support shaft is located within the second chamber, and the first cleaning bracket is sleeved on the support shaft. The annular connecting shell has a first water inlet on its side wall, and the first flow channel communicates with the first water inlet. With this configuration, during cleaning, the water flow in the first flow channel can be diverted into the annular connecting shell through the first water inlet. The diverted water flow can then drive the first cleaning bracket to rotate through the hollow connecting seat on one side of the support shaft.

[0018] Furthermore, the pre-filter also includes an annular flow guide shroud, which is fitted onto the connecting seat of the support shaft and snapped into place with the filter bottle housing. The annular flow guide shroud has a second water inlet, through which the first flow channel communicates with the first chamber. With this configuration, during cleaning, the water flow in the first flow channel can continue to enter the first chamber through the second water inlet to rinse the filter screen surface.

[0019] Furthermore, the sewage discharge assembly includes a sewage discharge valve body and an elastic telescopic interface located at one end of the sewage discharge valve body. The elastic telescopic interface is fixedly connected to the other end of the support shaft, and the connecting seat of the support shaft is axially movably connected to the annular guide shroud. When the sewage discharge valve body is in the closed state, the elastic telescopic interface applies force along the axial direction of the support shaft, causing the annular connecting shell to enter the second flow channel to block the first water inlet. With this configuration, when the sewage discharge valve body is closed, the first water inlet on the annular connecting shell is blocked by the elastic telescopic interface, allowing raw water to flow sequentially through the first chamber, the filter screen, and the second chamber, so that the pre-filter can automatically resume normal filtration operation.

[0020] Furthermore, the annular guide shroud has an inner annular step, and the second water inlet is formed on the annular step. The connecting seat of the support shaft has an annular edge with a protrusion facing the annular step. With this arrangement, in the flushing state, the water flow in the first channel impacts the annular edge axially, thereby causing the first water inlet on the annular connecting shell to disengage from the inner wall of the second channel, so that the first channel and the first water inlet are connected. In addition, the protrusion prevents the annular edge from blocking the second water inlet, ensuring that a portion of the water flow in the first channel enters the first chamber to flush the filter screen surface.

[0021] Furthermore, the annular flow guide is fixedly connected to one end of the filter screen frame. This design reinforces the filter screen frame, simplifies its structural design, and reduces cost.

[0022] Furthermore, the first cleaning support has a cylindrical structure and is equipped with a third water inlet, while a fourth water inlet is provided on the support shaft. During the rotation of the first cleaning support, the third and fourth water inlets are intermittently connected. With this configuration, when the third and fourth water inlets are connected, the water flow inside the support shaft can be sprayed radially and impact the deposited particles on the filter screen to dislodge them, thereby enhancing the cleaning effect.

[0023] Furthermore, the pre-filter also includes a second cleaning assembly located within the first chamber. The second cleaning assembly includes a second frame and scrapers disposed on the second frame. The scrapers abut against the outer wall of the filter screen and / or against the inner wall of the filter housing. The second frame rotates around the outer wall of the filter screen. Rotating the second frame facilitates simultaneous circumferential cleaning of deposits on the filter housing and the filter screen, improving cleaning efficiency.

[0024] Furthermore, one end of the second frame is fixedly connected to the drain valve body, which is rotatably and sealingly connected to the filter bottle housing. With this configuration, the second frame is driven by rotating the drain valve body to clean the outer wall of the filter screen and the inner wall of the filter bottle housing, making operation simple and cost-effective.

[0025] Furthermore, the water purification device provided by the present invention, based on the above technical solution, has the same technical effects as the above-mentioned pre-filter due to the use of the pre-filter. Compared with existing pre-filters, the pre-filter of the water purification device of the present invention has a better cleaning effect. Attached Figure Description

[0026] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0027] Figure 1 This is an exploded view of the overall structure of the pre-filter of the present invention;

[0028] Figure 2 This is a schematic diagram of the valve head housing of the pre-filter of the present invention;

[0029] Figure 3 This is a schematic diagram of the filter bottle housing of the pre-filter of the present invention;

[0030] Figure 4 This is a schematic diagram of the annular connecting shell of the pre-filter of the present invention;

[0031] Figure 5 This is a schematic diagram of the annular flow guide shroud of the pre-filter of the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of the support shaft of the pre-filter of the present invention;

[0033] Figure 7 This is a schematic diagram of the assembly structure of the first cleaning component of the pre-filter of the present invention;

[0034] Figure 8 This is a schematic diagram of the sewage discharge component of the pre-filter of the present invention;

[0035] Figure 9 This is a schematic diagram of the structure of the second skeleton of the pre-filter of the present invention;

[0036] Figure 10 This is a schematic diagram of the normal water flow filtered by the pre-filter of the present invention;

[0037] Figure 11 This is a schematic diagram of the water flow during the flushing process of the pre-filter of the present invention.

[0038] List of reference numerals in the attached diagram:

[0039] 11. Valve head housing; 111. Inlet port; 112. Outlet port; 1110. First flow channel; 1120. Second flow channel; 12. Filter bottle housing; 121. Slot; 2. Filter screen frame; 3. Filter screen; 4. Second frame; 41. First scraper; 42. Second scraper; 5. Sewage discharge assembly; 51. Sewage discharge valve body; 52. Elastic telescopic interface; 6. First cleaning bracket; 61. Hollow sleeve; 62. Blade; 63. Brush; 64. Third water inlet; 7. Support shaft; 71. Hollow body; 711. Fourth water inlet; 72. Connecting seat; 73. Annular edge; 731. Protrusion; 74. Connecting rib; 8. Annular guide shroud; 81. Second water inlet; 82. Annular step; 83. Slot protrusion; 9. Annular connecting shell; 91. First water inlet. Detailed Implementation

[0040] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0041] It should be noted that in the description of this invention, terms such as "upper," "lower," "inner," and "outer" that indicate direction or positional relationship are based on the direction or positional relationship shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0042] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. In addition, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] Based on the background art's description of the problem of incomplete cleaning of existing pre-filter screens, this invention provides a pre-filter designed to install a cleaning component on the inside of the pre-filter screen to thoroughly clean the inner wall of the screen, thereby improving the user experience.

[0044] Specifically, such as Figures 1 to 11As shown, the pre-filter of the present invention includes a valve head housing 11, a filter bottle housing 12, a filter screen frame 2, a filter screen 3, a drain assembly 5, a first cleaning assembly, and a second cleaning assembly. The valve head housing 11 has a first flow channel 1110 and a second flow channel 1120; the filter bottle housing 12 has a chamber, and one end of the filter bottle housing 12 is sealed to the valve head housing 11; the filter screen frame 2 is fixed within the chamber of the filter bottle housing 12; the filter screen 3 is fixed to the filter screen frame 2, and the filter screen 3 divides the chamber into a first chamber and a second chamber; the first chamber communicates with the first flow channel 1110, and the second chamber communicates with the second flow channel 1120; the drain assembly 5 is located at the other end of the filter bottle housing 12; the first cleaning assembly is located within the second chamber, and the first cleaning assembly includes a first cleaning bracket 6 rotatably connected to the first frame, the first cleaning bracket 6 having a brush 63 and a blade 62 located on the water-facing side, the end of the brush 63 abutting against the inner wall of the filter screen 3.

[0045] like Figure 2 As shown, the valve head housing 11 of the pre-filter of the present invention has an inlet port 111, an outlet port 112, and a threaded connection cover on one side. A second flow channel 1120 is located at the center of the threaded connection cover, and a first flow channel 1110 surrounds the second flow channel 1120. The first flow channel 1110 communicates with the inlet port 111, and the second flow channel 1120 communicates with the outlet port 112.

[0046] like Figure 3 As shown, the upper end of the filter housing 12 of the pre-filter of the present invention has an externally threaded opening, and four slots 121 are provided on the inner wall of the opening of the filter housing 12. In the installed state, the threaded connection cap of the valve head housing 11 is screwed and sealed to the opening of the filter housing 12.

[0047] like Figure 1 , Figure 10 as well as Figure 11 As shown, the filter screen frame 2 and filter screen 3 of the pre-filter of the present invention are both cylindrical structures, with the filter screen 3 fixed to the outer wall of the filter screen frame 2. A first chamber is formed between the outer wall of the filter screen 3 and the inner wall of the filter bottle housing 12, and a second chamber is formed inside the filter screen 3. The first chamber communicates with the first flow channel 1110 of the valve head housing 11, and the second chamber communicates with the second flow channel 1120 of the valve head housing 11.

[0048] like Figure 8 , Figure 10 as well as Figure 11As shown, the pre-filter of the present invention has a drain assembly 5 located at the lower end of the filter housing 12. The drain assembly 5 includes a drain valve body 51 and an elastic telescopic interface 52 located at one end of the drain valve body 51. Specifically, the elastic telescopic interface 52 is located in the second chamber, and a helical spring is sleeved on the outside of the elastic telescopic interface 52. The drain valve body 51 is rotatably and sealingly connected to the lower end of the filter housing 12.

[0049] like Figures 4 to 7 As shown, the first frame of the pre-filter of the present invention includes a support shaft 7 with a hollow structure and an annular connecting shell 9. The upper end of the annular connecting shell 9 communicates with the second flow channel 1120 inside the valve head housing 11. The lower end of the annular connecting shell 9 has an annular groove (not shown in the figure) on its inner wall. Four first water inlets 91 are evenly provided on the circumferential direction of the side wall of the annular connecting shell 9. All four first water inlets 91 can communicate with the first flow channel 1110 of the valve head housing 11.

[0050] like Figure 6 , Figure 10 as well as Figure 11 As shown, the support shaft 7 of the present invention includes a hollow body 71 and a connecting seat 72 located on the upper side of the hollow body 71. The hollow body 71 and the connecting seat 72 form a bucket-shaped hollow structure through four circumferentially distributed connecting ribs 74. The connecting seat 72 of the support shaft 7 has an annular edge 73 in the middle and an annular protrusion at the upper end. The annular protrusion is sleeved and fixed with the annular groove of the annular connecting shell 9 so that the support shaft 7 and the annular connecting shell 9 form an integral part. The lower end of the hollow body 71 of the support shaft 7 is located in the second cavity. The side wall of the hollow body 71 is uniformly provided with three sets of fourth water inlets 711 in the circumferential direction, and each set of fourth water inlets 711 has four inlets.

[0051] like Figure 7 As shown, the first cleaning bracket 6 of the present invention is a hollow sleeve 61, which is fitted onto the hollow body 71 of the support shaft 7. On the side near the connecting seat 72 of the funnel-shaped hollow structure, i.e., the upper end of the hollow sleeve 61, 16 blades 62 are evenly distributed circumferentially (i.e., the blades 62 are located on the water-facing side). On the side away from the connecting seat 72 of the funnel-shaped hollow structure, two sets of brushes 63 and two sets of third water inlets 64 are axially arranged on the side wall of the hollow sleeve 61. Each set of brushes 63 has 4 brushes, and each set of third water inlets 64 has 3 water inlets. The ends of each set of brushes 63 abut against the inner wall of the filter screen 3. After the lower end of the hollow body 71 is fixedly connected to the elastic telescopic interface 52, the hollow sleeve 61 is confined between the elastic telescopic interface 52 and the connecting seat 72.

[0052] When the water flow impacts the blades 62, causing the hollow sleeve 61 to rotate, the third water inlet 64 on the hollow sleeve 61 intermittently connects with the fourth water inlet 711 on the hollow body 71. In this way, after the brush 63 cleans the inner wall of the filter screen 3, the water flowing into the hollow body 71 can radially flush the inner wall of the filter screen 3 through the fourth water inlet 711 and the third water inlet 64, thus more thoroughly flushing away the deposits on the filter screen 3.

[0053] like Figure 5 , Figure 7 , Figure 10 as well as Figure 11 As shown, the pre-filter of the present invention also includes an annular flow guide shroud 8. The outer wall of the annular flow guide shroud 8 has four locking protrusions 83 arranged circumferentially. The four locking protrusions 83 of the annular flow guide shroud 8 are respectively axially engaged and fixed with four locking grooves 121 on the filter housing 12. The annular flow guide shroud 8 has an inner annular step 82 and second water inlets 81 formed on the annular step 82. The number of second water inlets 81 is 32, and the 32 second water inlets 81 are evenly distributed circumferentially along the annular step 82. The first flow channel 1110 communicates with the first chamber through the second water inlets 81. Furthermore, the annular step 82 of the annular flow guide shroud 8 is fixed to the upper end of the filter screen frame 2.

[0054] The annular guide shield 8 is fitted onto the outer wall of the connecting seat 72 of the support shaft 7, and the connecting seat 72 of the support shaft 7 is axially movably connected to the annular guide shield 8. Specifically, the inner wall of the annular step 82 of the annular guide shield 8 is fitted onto the outer wall of the connecting seat 72 of the support shaft 7, and the connecting seat 72 of the support shaft 7 can move up and down axially within the annular step 82. After the support shaft 7 and the annular connecting shell 9 are assembled to form an integral component, the support shaft 7 drives the first water inlet 91 of the annular connecting shell 9 to enter or exit the second flow channel 1120 to block or open the first water inlet 91.

[0055] like Figure 10 and Figure 11 As shown, the annular edge 73 on the connecting seat 72 of the present invention is located inside the annular guide shroud 8. The annular edge 73 is provided with two protrusions 731 facing the annular step 82. The two protrusions 731 are symmetrically distributed on the annular edge 73.

[0056] like Figure 1 , Figure 9 as well as Figure 10 As shown, the pre-filter of the present invention further includes a second cleaning assembly located in the first chamber. The second cleaning assembly includes a second frame 4 and scrapers disposed on the second frame 4. The scrapers abut against the outer wall of the filter screen 3 and against the inner wall of the filter bottle housing 12. Specifically, the second frame 4 has a cylindrical structure and is provided with two sets of scrapers symmetrically arranged in the radial direction. Each set of scrapers consists of two scrapers, which are arranged parallel to each other along the axial direction of the second frame 4.

[0057] The scraper includes a first scraper 41 and a second scraper 42. The first scraper 41 is located inside the second frame 4 and abuts against the outer wall of the filter screen 3. The second scraper 42 is located outside the second frame 4 and abuts against the inner wall of the filter bottle housing 12. The lower end of the second frame 4 is fixedly connected to the drain valve body 51. When the drain valve body 51 is rotated, it drives the second frame 4 to rotate around the filter screen 3 in the first chamber, thereby cleaning the outer wall of the filter screen 3 and the inner wall of the filter bottle housing 12 with the help of the first scraper 41 and the second scraper 42.

[0058] When the drain valve body 51 and the inlet port 111 are opened, and the outlet port 112 is closed, the pre-filter enters the flushing state. Because the pressure difference between the second chamber and the first flow channel increases after the drain valve body 51 is opened, when the water flows through the first flow channel 1110 inside the valve head housing 11, the incoming water impacts and squeezes the annular edge 73 of the connecting seat 72 located inside the annular guide shroud 8, causing the connecting seat 72 to drive the entire first frame downwards. That is, under the drive of the connecting seat 72, the first water inlet 91 on the annular connecting shell 9 exits from the inner wall of the second flow channel 1120, thus connecting the first flow channel 1110 with the first water inlet 91. In this way, the water flow in the first flow channel 1110 is diverted through the first water inlet 91 into the annular connecting shell 9, flows downwards, and drives the first cleaning bracket 6 to rotate through the funnel-shaped hollow structure at the lower end of the connecting seat 72. The water flowing out from the funnel-shaped hollow structure directly impacts the blades 62, causing the hollow sleeve 61 to rotate. The brush 63 on the hollow sleeve 61 cleans the deposits on the inner wall of the filter screen 3. At the same time, another part of the water flow from the annular connecting shell 9 enters the hollow body 71. During the rotation of the hollow sleeve 61, when the third water inlet 64 and the fourth water inlet 711 are connected or misaligned, the water flow can intermittently wash the surface of the filter screen 3 radially to remove the deposits from the surface of the filter screen 3.

[0059] Furthermore, by rotating the drain valve body 51, the second frame 4 is driven to rotate outside the filter screen 3. The first scraper 41 on the second frame 4 cleans the outer surface of the filter screen 3, and the second scraper 42 on the second frame 4 cleans the inner wall of the filter bottle housing 12. As the water pressure drives the first frame to move downwards, the protrusion 731 of the annular edge 73 abuts against the annular step 82, allowing the water flow in the first flow channel 1110 to continue entering the first chamber along the second water inlet 81 to rinse the outer wall of the filter screen 3 and the inner wall of the filter bottle housing 12. The wastewater after rinsing flows out through the drain valve body 51 below.

[0060] When the drain valve 51 is closed and the inlet 111 and outlet 112 are opened, the pre-filter enters normal filtration operation. Because the pressure difference between the second chamber and the first flow channel is reduced after the drain valve 51 is closed, the elastic telescopic interface 52 of the drain assembly 5 applies axial force, causing the first water inlet 91 of the annular connecting shell 9 on the first frame to enter the second flow channel 1120 and close the first water inlet 91. Therefore, the water flow from the inlet 111 sequentially passes through the first flow channel 1110, the second water inlet 81, the first chamber, the filter screen 3, the second chamber, the funnel-shaped hollow structure, and the annular connecting shell 9 into the second flow channel 1120, and finally, the purified water flows out from the outlet 112.

[0061] It should be noted that the number of the first water inlet 91, the second water inlet 81, the third water inlet 64, the fourth water inlet 711, the slot 121, the protrusion 83, the protrusion 731, the scraper, the brush 63, the blade 62, and the connecting rib 74 described above is not limiting. Those skilled in the art can flexibly set the specific number of the above features according to actual applications. Such flexibility and changes do not deviate from the principle and scope of this utility model and should be limited to the protection scope of this utility model.

[0062] Finally, this utility model also provides a water purification device, which includes the aforementioned pre-filter.

[0063] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A prefilter, characterized by, The utility model relates to a filter head and filter bottle assembly, comprising: a valve head housing (11) having a first flow channel (1110) and a second flow channel (1120) therein; a filter bottle housing (12) having a chamber, one end of the filter bottle housing (12) being sealingly connected to the valve head housing (11); a filter screen frame (2) fixed in the chamber of the filter bottle housing (12); a filter screen (3) fixed on the filter screen frame (2), the filter screen (3) dividing the chamber into a first chamber and a second chamber, the first chamber being in communication with the first flow channel (1110), and the second chamber being in communication with the second flow channel (1120); a blowdown assembly (5) located at the other end of the filter bottle housing (12); and a first cleaning assembly located in the second chamber; wherein the first cleaning assembly comprises a first cleaning support (6) rotatably connected to a first frame, the first cleaning support (6) being provided with a brush (63) and a vane (62) located at a water-facing side, the end of the brush (63) abutting against the inner wall of the filter screen (3); when the blowdown assembly (5) is in an open state, the water flow entering the second chamber impacts the vane (62) to drive the first cleaning support (6) to rotate so that the brush (63) circumferentially cleans the inner wall of the filter screen (3); the first frame comprises a support shaft (7) having a hollow structure and an annular connecting shell (9), the first cleaning support (6) being sleeved on the support shaft (7), one side of the support shaft (7) being provided with a connecting seat (72) having a hollow structure, the connecting seat (72) of the support shaft (7) being fixedly connected to one end of the annular connecting shell (9), the other side of the support shaft (7) being located in the second chamber; wherein the other end of the annular connecting shell (9) is in communication with the second flow channel (1120), the sidewall of the annular connecting shell (9) is provided with a first water inlet (91), and the first flow channel (1110) is in communication with the first water inlet (91); the pre-filter further comprises an annular flow guide cover (8), the annular flow guide cover (8) being provided with a second water inlet (81), the annular flow guide cover (8) having an inscribed annular step (82), the second water inlet (81) being formed on the annular step (82), the first flow channel (1110) being in communication with the first chamber through the second water inlet (81), the connecting seat (72) of the support shaft (7) being provided with an annular edge (73), and the annular edge (73) being provided with a protrusion (731) facing the annular step (82).

2. The prefilter of claim 1, wherein, the annular flow guide cover (8) is sleeved on the connecting seat (72) of the support shaft (7), and the annular flow guide cover (8) is clamped and fixed to the filter bottle housing (12).

3. The prefilter of claim 2, wherein, The blowdown assembly (5) comprises a blowdown valve body (51) and an elastic expansion joint (52) at one end of the blowdown valve body (51), the elastic expansion joint (52) is fixedly connected with the other end of the support shaft (7), the connecting seat (72) of the support shaft (7) is movably connected with the annular flow guide cover (8) in the axial direction; when the blowdown valve body (51) is in the closed state, the elastic expansion joint (52) exerts force along the axial direction of the support shaft (7) so that the annular connecting shell (9) enters the second flow channel (1120) to block the first water inlet (91).

4. The prefilter of claim 1, wherein, The annular flow guide cover (8) is fixedly connected with one end of the filter screen framework (2).

5. The prefilter of claim 1, wherein, The first cleaning support (6) is a cylindrical structure, and a third water inlet (64) is further arranged on the first cleaning support (6), and a fourth water inlet (711) is arranged on the support shaft (7); during rotation of the first cleaning support (6), the third water inlet (64) and the fourth water inlet (711) are intermittently communicated.

6. The prefilter of claim 3, wherein, The pre-filter further comprises a second cleaning assembly in the first chamber, the second cleaning assembly comprises a second framework (4) and a scraping strip arranged on the second framework (4), the scraping strip abuts against the outer wall of the filter screen (3) and / or the scraping strip abuts against the inner wall of the filter bottle shell (12), and the second framework (4) rotates around the outer wall of the filter screen (3).

7. The prefilter of claim 6, wherein, One end of the second framework is fixedly connected with the blowdown valve body (51), and the blowdown valve body (51) is sealingly and rotatably connected with the filter bottle shell (12).

8. A water purifying apparatus characterized by comprising: The pre-filter comprises any one of claims 1 to 7. The pre-filter comprises any one of claims 1 to 7.

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