Pre-filter and water purifying device comprising same

Abstract

The invention relates to the technical field of water purification equipment, and particularly provides a pre-filter and a water purification device comprising the pre-filter. The pre-filter comprises a valve head shell, a filter bottle shell, a filter screen framework, a filter screen, a pollution discharge assembly and a first cleaning assembly. Wherein the filter screen framework is fixed in a cavity of the filter bottle shell; the filter screen is fixed on the filter screen framework and divides the cavity of the filter bottle shell into a first cavity and a second cavity; the pollution discharge assembly is positioned at the other end of the filter bottle shell; the first cleaning assembly is located in the second cavity and comprises a first framework and a first cleaning support rotationally connected with the first framework, the first cleaning support is provided with a brush and a blade located on the water facing side, and the brush abuts against the inner wall of the filter screen. Through the arrangement, when the pollution discharge assembly is in an open state, water flow entering the second chamber impacts the blades to drive the first cleaning bracket to rotate, so that the brush cleans the inner wall of the filter screen, and the cleaning effect of the pre-filter is improved.

Description

Technical Field

[0001] The invention relates to the technical field of water purification equipment, and specifically provides a pre-filter and a water purification device comprising the pre-filter. Background Art

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

[0003] Usually, when the pre-filter is forward-flushed using the water pressure of tap water, the water flow can only flush away large particles of impurities, mud, etc. on the outer surface of the filter, and some impurities that have been embedded in the filter are not easy to be flushed away; when the pre-filter is reverse-flushed, the water flow flows from the inside to the outside of the filter, and there is a problem that impurities can easily block the inner surface of the filter, resulting in an unsatisfactory flushing effect for the pre-filter and a poor user experience.

[0004] Accordingly, the art needs a new pre-filter to solve the above problems. Summary of the invention

[0005] In order to solve the above problems in the prior art, that is, to solve the problem that the filter screen of the prior pre-filter is not cleaned thoroughly.

[0006] In a first aspect, the present invention provides a pre-filter, which includes: 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 and connected to the valve head housing; a filter screen frame fixed in the chamber of the filter bottle housing; a filter screen fixed on the filter screen frame, the filter screen dividing the chamber into a first chamber and a second chamber; the first chamber is connected to the first flow channel, and the second chamber is connected to the second flow channel; a sewage discharge assembly located at the other end of the filter bottle housing; and a first cleaning assembly, the first cleaning assembly being located in the second chamber; wherein the first cleaning assembly includes a first skeleton and a first cleaning bracket rotatably connected to the first skeleton, the first cleaning bracket being provided with a brush and a blade located on the water-facing side, the end of the brush abutting against the inner wall of the filter screen; when the sewage discharge assembly is in an open state, the water flow entering the second chamber impacts the blade and then drives the first cleaning bracket to rotate so that the brush cleans the inner wall of the filter screen circumferentially.

[0007] In the case of the preferred technical solution of the above-mentioned pre-filter, the first skeleton 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, the connecting seat of the support shaft is fixedly connected to one end of the annular connecting shell, and the other side of the support shaft is located in the second chamber; wherein, the other end of the annular connecting shell is connected to the second flow channel, a first water opening is provided on the side wall of the annular connecting shell, and the first flow channel is connected to the first water opening.

[0008] In the case of the preferred technical solution of the pre-filter mentioned above, the pre-filter also includes an annular flow guide cover, which is sleeved on the connecting seat of the support shaft, and is clamped and fixed to the filter bottle shell. A second water outlet is provided on the annular flow guide cover, and the first flow channel is connected to the first chamber through the second water outlet.

[0009] In the case of the preferred technical solution of the above-mentioned pre-filter, 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 cover; when the sewage discharge valve body is in a closed state, the elastic telescopic interface applies axial force along the support shaft to make the annular connecting shell enter the second flow channel to block the first water outlet.

[0010] In the case of the preferred technical solution of the above-mentioned pre-filter, the annular guide cover has an inscribed annular step, the second water outlet is formed on the annular step, the connecting seat of the support shaft has an annular edge, a protrusion is provided on the annular edge, and the protrusion is arranged toward the annular step.

[0011] In the case of the above-mentioned preferred technical solution of the pre-filter, the annular air guide cover is fixedly connected to one end of the filter frame.

[0012] In the case of the preferred technical solution of the above-mentioned pre-filter, the first cleaning bracket is a cylindrical structure, and is also provided with a third water port, and the support shaft is provided with a fourth water port; during the rotation of the first cleaning bracket, the third water port is intermittently connected with the fourth water port.

[0013] In the case of the preferred technical solution of the above-mentioned pre-filter, the pre-filter also includes a second cleaning assembly located in the first chamber, the second cleaning assembly includes a second frame and a scraper bar arranged on the second frame, the scraper bar abuts against the outer wall of the filter screen and / or the scraper bar abuts against the inner wall of the filter bottle housing, and the second frame rotates around the outer wall of the filter screen.

[0014] In the case of the preferred technical solution of the above-mentioned pre-filter, one end of the second skeleton is fixedly connected to the drain valve body, and the drain valve body is sealingly and rotatably connected to the filter bottle housing.

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

[0016] It can be understood by those skilled in the art that the pre-filter of the present invention comprises a valve head housing, a filter bottle housing, a filter screen frame, a filter screen, a sewage discharge assembly and a first cleaning assembly. Among them, 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 and connected to the valve head housing; the filter screen frame is fixed in the chamber of the filter bottle housing; the filter screen is fixed on the filter screen frame, and the filter screen divides the chamber into a first chamber and a second chamber; the first chamber is connected to the first flow channel, and the second chamber is connected to the second flow channel; the sewage discharge assembly is located at the other end of the filter bottle housing; the first cleaning assembly is located in the second chamber, and the first cleaning assembly includes a first cleaning bracket rotatably connected to the first skeleton, and a brush and a blade are provided on the first cleaning bracket, and the end of the brush abuts against the inner wall of the filter screen. Through such a setting, when the sewage discharge assembly is in an open state, the water flow entering the second chamber impacts the blade and drives the first cleaning bracket to rotate so that the brush cleans the inner wall of the filter screen circumferentially, which is convenient for removing the deposited particles on the inner wall of the filter screen, and improves the cleaning effect of the pre-filter as a whole.

[0017] Furthermore, the first skeleton includes a support shaft with a hollow structure and an annular connection shell, one end of the annular connection shell is connected to the second flow channel, one side of the support shaft has a hollow bucket-shaped connection seat, the connection seat of the support shaft is fixedly connected to the other end of the annular connection shell, the other side of the support shaft is located in the second chamber, and the first cleaning bracket is sleeved on the support shaft; wherein, a first water opening is provided on the side wall of the annular connection shell, and the first flow channel is connected to the first water opening. Through such an arrangement, in the cleaning state, the water flow in the first flow channel can be diverted through the first water opening into the annular connection shell, and the diverted water flow can pass through the hollow connection seat on one side of the support shaft to drive the first cleaning bracket to rotate.

[0018] Furthermore, the pre-filter further comprises an annular flow guide cover, which is sleeved on the connection seat of the support shaft, and is fixedly connected to the filter bottle housing, and a second water inlet is provided on the annular flow guide cover, and the first flow channel is connected to the first chamber through the second water inlet. With such an arrangement, in the cleaning state, 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 expansion joint located at one end of the sewage discharge valve body, the elastic expansion joint 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 a closed state, the elastic expansion joint applies force along the axial direction of the support shaft so that the annular connecting shell enters the second flow channel to block the first water opening. Through such a setting, when the sewage discharge valve body is closed, the first water opening on the annular connecting shell is blocked by means of the elastic expansion joint so that the raw water can flow through the first chamber, the filter screen and the second chamber in sequence, so that the pre-filter automatically resumes the normal filtering working state.

[0020] Furthermore, the annular flow guide cover has an inscribed annular step, the second water opening is formed on the annular step, the connecting seat of the supporting shaft has an annular edge, a protrusion is provided on the annular edge, and the protrusion is arranged toward the annular step. With such an arrangement, in the flushing state, the water flow in the first flow channel impacts the annular edge along the axial direction, thereby driving the first water opening on the annular connecting shell to separate from the inner wall of the second flow channel so that the first flow channel is connected to the first water opening. In addition, the protrusion is used to prevent the annular edge from blocking the second water opening to ensure that a part of the water flow in the first flow channel enters the first chamber to flush the surface of the filter screen.

[0021] Furthermore, the annular flow guide cover is fixedly connected to one end of the filter frame. Through such an arrangement, the filter frame is reinforced with the aid of the annular flow guide cover, the structural design of the filter frame is simplified, and the cost is low.

[0022] Furthermore, the first cleaning bracket is a cylindrical structure, and a third water opening is also provided on the first cleaning bracket, and a fourth water opening is provided on the support shaft; during the rotation of the first cleaning bracket, the third water opening is intermittently connected with the fourth water opening. Through such an arrangement, when the third water opening is relatively connected with the fourth water opening, the water flow in the support shaft can be radially sprayed toward and impact the deposited particles on the filter screen to separate from the filter screen to enhance the cleaning effect.

[0023] Furthermore, the pre-filter further comprises a second cleaning assembly located in the first chamber, the second cleaning assembly comprising a second frame and a scraper disposed on the second frame, the scraper abutting against the outer wall of the filter screen and / or the scraper abutting against the inner wall of the filter bottle housing, and the second frame rotating around the outer wall of the filter screen. Rotating the second frame facilitates circumferential cleaning of the sediment on the filter bottle housing and the filter screen at the same time, thereby improving the cleaning efficiency.

[0024] Furthermore, one end of the second frame is fixedly connected to the drain valve body, and the drain valve body is sealed and rotatably connected to the filter bottle housing. Through such an arrangement, the drain valve body is rotated to drive the second frame to clean the outer wall of the filter screen and the inner wall of the filter bottle housing, which is simple to operate and low in cost.

[0025] In addition, the water purification device further provided by the present invention on the basis of the above-mentioned technical solution has the technical effects possessed by the above-mentioned pre-filter due to the adoption of the above-mentioned pre-filter. Compared with the existing pre-filter, the cleaning effect of the pre-filter of the water purification device of the present invention is better. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] Figure 1 It is a schematic diagram of the overall structure of the pre-filter of the present invention;

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

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

[0030] Figure 4 It is a structural schematic diagram of the annular connection shell of the pre-filter of the present invention;

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

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

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

[0034] Figure 8 It is a structural schematic diagram of the sewage discharge assembly of the pre-filter of the present invention;

[0035] Fig. 9 is a schematic structural diagram of a second skeleton of the pre-filter of the present invention;

[0036] Fig.10 It is a schematic diagram of water flow during normal filtration of the pre-filter of the present invention;

[0037] Fig.11 It is a schematic diagram of water flow in the flushing state of the pre-filter of the present invention.

[0038] List of reference numerals:

[0039] 11. Valve head housing; 111. Water inlet interface; 112. Water outlet interface; 1110. First flow channel; 1120. Second flow channel; 12. Filter bottle housing; 121. Card slot; 2. Filter screen frame; 3. Filter screen; 4. Second frame; 41. First scraper strip; 42. Second scraper strip; 5. Drain assembly; 51. Drain valve body; 52. Elastic telescopic interface; 6. First cleaning bracket; 61. Hollow sleeve; 62. Blade; 63. Brush; 64. Third water outlet; 7. Support shaft; 71. Hollow body; 711; Fourth water outlet; 72. Connecting seat; 73. Annular edge; 731. Protrusion; 74; Connecting rib; 8. Annular guide cover; 81. Second water outlet; 82. Annular step; 83. Card convex; 9. Annular connecting shell; 91. First water outlet. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0041] It should be noted that, in the description of the present invention, terms such as "upper", "lower", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the 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, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0042] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] Based on the problem of incomplete cleaning of the existing pre-filter screen pointed out in the background technology, the present invention provides a pre-filter, which aims to install a cleaning component on the inner side of the pre-filter screen to thoroughly clean the inner wall of the screen, thereby improving the user experience.

[0044] Specifically, Figures 1 to 11As shown, the pre-filter of the present invention comprises a valve head housing 11, a filter bottle housing 12, a filter screen frame 2, a filter screen 3, a sewage discharge assembly 5, a first cleaning assembly and a second cleaning assembly. Among them, 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 and connected to the valve head housing 11; the filter screen frame 2 is fixed in the chamber of the filter bottle housing 12; the filter screen 3 is fixed on the filter screen frame 2, and the filter screen 3 divides the chamber into a first chamber and a second chamber; the first chamber is connected to the first flow channel 1110, and the second chamber is connected to the second flow channel 1120; the sewage discharge assembly 5 is located at the other end of the filter bottle housing 12; the first cleaning assembly is located in the second chamber, and the first cleaning assembly comprises a first cleaning bracket 6 rotatably connected to the first skeleton, and the first cleaning bracket 6 is provided with a brush 63 and a blade 62 located on the water-facing side, and the end of the brush 63 abuts against the inner wall of the filter screen 3.

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

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

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

[0048] like Figure 8 , Fig.10 as well as Fig.11As shown, the sewage discharge assembly 5 of the pre-filter of the present invention is located at the lower end of the filter bottle housing 12, and the sewage discharge assembly 5 includes a sewage discharge valve body 51 and an elastic expansion joint 52 located at one end of the sewage discharge valve body 51. Specifically, the elastic expansion joint 52 is located in the second chamber, and a coil spring is sleeved on the outer side of the elastic expansion joint 52. The sewage discharge valve body 51 is rotatably connected to the lower end of the filter bottle housing 12 in a sealed manner.

[0049] like Figures 4 to 7 As shown, the first skeleton 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 is connected to the second flow channel 1120 in the valve head housing 11, and the inner wall of the lower end of the annular connecting shell 9 has an annular groove (not shown in the figure), and the side wall of the annular connecting shell 9 is evenly provided with four first water openings 91 in the circumferential direction, and the four first water openings 91 can all be connected to the first flow channel 1110 of the valve head housing 11.

[0050] like Figure 6 , Fig.10 as well as Fig.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 middle position of the connecting seat 72 of the support shaft 7 has an annular edge 73 and an annular convex rib located at the upper end. The annular convex rib 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 component. The lower end of the hollow body 71 of the support shaft 7 is located in the second chamber, and the side wall of the hollow body 71 is evenly provided with 3 groups of fourth water ports 711 in the circumferential direction, and the number of each group of fourth water ports 711 is 4.

[0051] like Figure 7 As shown, the first cleaning bracket 6 of the present invention is a hollow sleeve 61, and the hollow sleeve 61 is sleeved on the hollow body 71 of the support shaft 7. On the side of the connection seat 72 close to the bucket-shaped hollow structure, that is, the upper end of the hollow sleeve 61, 16 blades 62 are evenly distributed circumferentially (that is, the blades 62 are located on the water-facing side). On the side of the connection seat 72 away from the bucket-shaped hollow structure, two groups of brushes 63 and two groups of third water ports 64 are axially arranged on the side wall of the hollow sleeve 61. Among them, the number of each group of brushes 63 is 4, the number of each group of third water ports 64 is 3, and the end of each group of brushes 63 is against the inner wall of the filter 3. Among them, 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 connection seat 72.

[0052] When the water flow impacts the blade 62 and drives the hollow sleeve 61 to rotate, the third water opening 64 on the hollow sleeve 61 is intermittently connected with the fourth water opening 711 on the hollow body 71. In this way, after the brush 63 cleans the inner wall of the filter screen 3, the water flow flowing into the hollow body 71 can radially wash the inner wall of the filter screen 3 through the fourth water opening 711 and the third water opening 64, so as to more thoroughly wash the sediment on the filter screen 3.

[0053] like Figure 5 , Figure 7 , Fig.10 as well as Fig.11 As shown, the pre-filter of the present invention also includes an annular flow guide cover 8, and four clamping protrusions 83 are provided on the circumference of the outer wall of the annular flow guide cover 8. The four clamping protrusions 83 of the annular flow guide cover 8 are respectively fixed in the axial direction with the four clamping grooves 121 on the filter bottle housing 12. The annular flow guide cover 8 has an inscribed annular step 82 and a second water through port 81 formed on the annular step 82. The number of the second water through ports 81 is 32, and the 32 second water through ports 81 are evenly distributed along the circumference of the annular step 82. The first flow channel 1110 is connected to the first chamber through the second water through port 81. In addition, the annular step 82 of the annular flow guide cover 8 is fixed to the upper end of the filter screen skeleton 2.

[0054] The annular air guide cover 8 is sleeved on the outer wall of the connection seat 72 of the support shaft 7, and the connection seat 72 of the support shaft 7 is movably connected with the annular air guide cover 8 along the axial direction. Specifically, the inner wall of the annular step 82 of the annular air guide cover 8 is sleeved on the outer wall of the connection seat 72 of the support shaft 7, and the connection seat 72 of the support shaft 7 can move up and down in the annular step 82 along the axial direction. 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 opening 91 of the annular connecting shell 9 to enter or exit the second flow channel 1120 to block or open the first water opening 91.

[0055] like Fig.10 and Fig.11 As shown, the annular edge 73 on the connecting seat 72 of the present invention is located on the inner side of the annular air deflector 8 , and the annular edge 73 is provided with two protrusions 731 facing the annular step 82 , and the two protrusions 731 are symmetrically distributed on the annular edge 73 .

[0056] like Figure 1 , Fig. 9 as well as Fig.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 a scraper disposed on the second frame 4, the scraper abuts against the outer wall of the filter screen 3 and the scraper abuts against the inner wall of the filter bottle housing 12. Specifically, the second frame 4 is a cylindrical structure, the second frame 4 is provided with two groups of scrapers symmetrically along the radial direction, each group of scrapers has two scrapers, and the scrapers are arranged parallel to 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 on the inner side of the second skeleton 4, and the first scraper 41 abuts against the outer wall of the filter screen 3. The second scraper 42 is located on the outer side of the second skeleton 4, and the second scraper 42 abuts against the inner wall of the filter bottle housing 12. The lower end of the second skeleton 4 is fixedly connected to the drain valve body 51. When the drain valve body 51 is rotated, the drain valve body 51 drives the second skeleton 4 to rotate around the filter screen 3 in the first chamber, and then the outer wall of the filter screen 3 and the inner wall of the filter bottle housing 12 are cleaned with the help of the first scraper 41 and the second scraper 42.

[0058] When the drain valve body 51 and the water inlet interface 111 are opened and the water outlet interface 112 is closed, the pre-filter enters the flushing state. Since 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 in the valve head housing 11, the inlet water flow impacts and squeezes the annular edge 73 of the connecting seat 72 located in the annular flow guide cover 8, so that the connecting seat 72 drives the first skeleton to move downward as a whole. That is, under the drive of the connecting seat 72, the first water opening 91 on the annular connecting shell 9 withdraws from the inner wall of the second flow channel 1120, thereby connecting the first flow channel 1110 with the first water opening 91. In this way, the water flow in the first flow channel 1110 is diverted through the first water opening 91 into the annular connecting shell 9 downward and passes through the bucket-shaped hollow structure at the lower end of the connecting seat 72 to drive the first cleaning bracket 6 to rotate. That is, the water flowing out of the bucket-shaped hollow structure directly impacts the blades 62 to drive the hollow sleeve 61 to rotate, and the brush 63 on the hollow sleeve 61 cleans the sediment on the inner wall of the filter 3. At the same time, another part of the water flow in the annular connecting shell 9 enters the hollow body 71. During the rotation of the hollow body 71, when the third water port 64 is connected or misaligned with the fourth water port 711, the water flow can intermittently wash the surface of the filter 3 in the radial direction to separate the sediment from the surface of the filter 3.

[0059] In addition, by rotating the drain valve body 51, the second frame 4 is driven to rotate outside the filter 3, the first scraper 41 on the second frame 4 cleans the outer surface of the filter 3, and the second scraper 42 on the second frame 4 cleans the inner wall of the filter bottle housing 12. When the first frame is driven by water pressure to move downward as a whole, the protrusion 731 of the annular edge 73 abuts against the annular platform, so that the water flow in the first flow channel 1110 can continue to enter the first chamber along the second water opening 81 to flush the outer wall of the filter 3 and the inner wall of the filter bottle housing 12. The above-mentioned sewage after flushing flows out from the drain valve body 51 below.

[0060] Close the drain valve body 51, open the water inlet interface 111 and the water outlet interface 112, and the pre-filter enters the normal filtering working state. After closing the drain valve body 51, the pressure difference between the second chamber and the first flow channel is weakened, and the elastic expansion interface 52 of the drain assembly 5 applies axial force so that the first water opening 91 of the annular connecting shell 9 on the first skeleton enters the second flow channel 1120 to close the first water opening 91. Therefore, the water flow of the water inlet interface 111 passes through the first flow channel 1110, the second water opening 81, the first chamber, the filter 3, the second chamber, the bucket-shaped hollow structure, the annular connecting shell 9, enters the second flow channel 1120, and finally the clean water flows out from the water outlet interface 112.

[0061] It should be noted that the number of the first water opening 91, the second water opening 81, the third water opening 64, the fourth water opening 711, the slot 121, the cam 83, the protrusion 731, the scraper strip, the brush 63, the blade 62, and the connecting rib 74 described above is not restrictive, and 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 the present invention and should be limited within the scope of protection of the present invention.

[0062] Finally, the present invention also provides a water purification device, which includes the above-mentioned pre-filter.

[0063] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle 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 fall within the protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: 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 sealedly 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 is in communication with the first flow channel (1110), and the second chamber is in communication with the second flow channel (1120); A sewage discharge assembly (5) located at the other end of the filter bottle housing (12); and a first cleaning component, the first cleaning component being located in the second chamber; The first cleaning component comprises a first frame and a first cleaning bracket (6) rotatably connected to the first frame, the first cleaning bracket (6) is provided with a brush (63) and a blade (62) located on the water-facing side, and the end of the brush (63) abuts against the inner wall of the filter (3); When the sewage discharge component (5) is in an open state, the water flow entering the second chamber impacts the blade (62) and drives the first cleaning bracket (6) to rotate so that the brush (63) cleans the inner wall of the filter (3) in a circumferential direction.

2. The pre-filter according to claim 1, characterized in that: The first skeleton comprises a support shaft (7) with a hollow structure and an annular connecting shell (9), the first cleaning bracket (6) is sleeved on the support shaft (7), one side of the support shaft (7) has a connecting seat (72) with a hollow structure, the connecting seat (72) of the support shaft (7) is fixedly connected to one end of the annular connecting shell (9), and the other side of the support shaft (7) is located in the second chamber; wherein the other end of the annular connecting shell (9) is connected to the second flow channel (1120), a first water opening (91) is provided on the side wall of the annular connecting shell (9), and the first flow channel (1110) is connected to the first water opening (91).

3. The pre-filter according to claim 2, characterized in that: The pre-filter further comprises an annular flow guide cover (8), the annular flow guide cover (8) being sleeved on the connecting seat (72) of the supporting shaft (7), the annular flow guide cover (8) being fixedly connected to the filter bottle housing (12), the annular flow guide cover (8) being provided with a second water passage (81), and the first flow channel (1110) being connected to the first chamber via the second water passage (81).

4. The pre-filter according to claim 3, characterized in that: The sewage discharge assembly (5) comprises a sewage discharge valve body (51) and an elastic telescopic interface (52) located at one end of the sewage discharge valve body (51), wherein the elastic telescopic interface (52) is fixedly connected to the other end of the support shaft (7), and the connecting seat (72) of the support shaft (7) is movably connected to the annular guide cover (8) along the axial direction; when the sewage discharge valve body (51) is in a closed state, the elastic telescopic interface (52) applies an axial force along the support shaft (7) so that the annular connecting shell (9) enters the second flow channel (1120) to block the first water outlet (91).

5. The pre-filter according to claim 4, characterized in that: The annular flow guide cover (8) has an inscribed annular step (82), the second water outlet (81) is formed on the annular step (82), the connecting seat (72) of the support shaft (7) has an annular edge (73), a protrusion (731) is provided on the annular edge (73), and the protrusion (731) is arranged toward the annular step (82).

6. The pre-filter according to claim 2, characterized in that: The annular air guide cover (8) is fixedly connected to one end of the filter frame (2).

7. The pre-filter according to claim 2, characterized in that: The first cleaning bracket (6) is a cylindrical structure, and is also provided with a third water opening (64), and the support shaft (7) is provided with a fourth water opening (711); during the rotation of the first cleaning bracket (6), the third water opening (64) is intermittently connected to the fourth water opening (711).

8. The pre-filter according to claim 4, characterized in that: The pre-filter also includes a second cleaning component located in the first chamber, the second cleaning component includes a second frame (4) and a scraper arranged on the second frame (4), the scraper abuts against the outer wall of the filter screen (3) and / or the scraper abuts against the inner wall of the filter bottle housing (12), and the second frame (4) rotates around the outer wall of the filter screen (3).

9. The pre-filter according to claim 8, characterized in that: One end of the second skeleton is fixedly connected to the sewage discharge valve body (51), and the sewage discharge valve body (51) is sealingly rotatably connected to the filter bottle housing (12).

10. A water purification device, characterized in that: The pre-filter comprises the pre-filter according to any one of claims 1 to 9.

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