Pre-filter

Abstract

The utility model relates to the field of water filtering equipment, in particular to a pre-filter, which mainly solves the problems of high production cost and low filtering efficiency of the pre-filter in the prior art, and comprises a shell, a filtering cover, a rotary cover, a metal support ring, a connecting plate, a first metal interface, a second metal interface, a switching mechanism and a filtering mechanism, the shell is provided with a cavity, an upper port and a lower port, the upper port and the lower port are communicated with the cavity, a water inlet and a water outlet are formed in the side faces of the shell respectively, the rotary cover rotatably covers the upper port of the shell, a drain outlet is formed in the rotary cover, and the filter cover is connected with the shell through a metal supporting ring. The lower end of the filter cover is provided with a lower end opening, the cavity is communicated with the interior of the filter cover through the lower end opening, the switching mechanism is arranged in the cavity and connected with the rotary cover, the switching mechanism is provided with a first water inlet assembly, a second water inlet assembly, a water outlet assembly and a sewage draining assembly, and the connecting plate is arranged on the switching mechanism.

Description

Technical Field

[0001] The utility model relates to the field of water filtration equipment, in particular to a pre-filter. Background Art

[0002] After the existing pre-filter works for a long time, impurities carried in the raw water are embedded in the mesh holes of the filter element, which easily causes the filter element to be blocked. When cleaning the filter element, relatively clean water flow is passed into the pre-filter as a cleaning liquid, and the filter element is flushed with the cleaning liquid. This cleaning method is also called the forward flushing type cleaning method. When flushing with the forward flushing type cleaning method, the cleaning liquid flushes downward along the surface of the stainless steel mesh, and most of the small particle impurities intercepted and trapped in the mesh holes cannot be effectively flushed, resulting in the blockage of the filter element.

[0003] The authorized announcement number CN113509773B discloses a pre-filter, which is characterized in that the pre-filter includes a filter housing part, a filter cartridge, an electric drain valve, a reduction motor, a cleaning and scraping component, and an electronic controller. The filter housing part includes a sealing cover at the top and a container part at the bottom. One side of the upper end of the container part is provided with a water inlet connection port, and a water inlet connector is arranged in the water inlet connection port. Correspondingly, a purified water outlet is arranged on the other side of the upper end, and a drain port is arranged on one side of the lower end. The electric drain valve is connected to the drain port. The filter cartridge is arranged in the filter housing part and is integrally tubular. An outwardly convex O-ring sealing structure is arranged on the periphery of each of the two end ports. The O-ring sealing structure is in sealing cooperation with the inner wall of the filter housing part, and an annular purified water cavity is formed between the two O-ring sealing structures. The purified water cavity communicates with the purified water outlet. A raw water inlet is arranged on one side surface of the upper port of the filter cartridge, and the raw water inlet and the front end of the water inlet connector form a sealed plug-in fit. A filter screen is arranged on the inner wall of the filter cartridge below the raw water inlet. The cleaning and scraping component is arranged on the central axis in the filter cartridge. A plurality of flexible scraping strips or bristles are arranged on its outer surface and are in contact with the surface of the filter screen. A rotating connecting rod is arranged at the center of the sealing cover, and the two form a dynamic sealing fit. The lower end of the rotating connecting rod is connected to the upper end of the cleaning and scraping component, and the upper end of the rotating connecting rod is connected to the reduction motor arranged on the sealing cover. The reduction motor can drive the cleaning and scraping component to rotate relatively in the filter cartridge. The electronic controller controls the operation of the electric drain valve and the reduction motor. A flow guiding and positioning device is further arranged inside the bottom of the container part. The flow guiding and positioning device is integrally cylindrical, and the periphery of its upper port is polygonal, and the inner side surface of the lower port of the filter cartridge is also polygonal, and the two are mutually adapted. A central axis is arranged on the central axis of the flow guiding and positioning device. A positioning hole is arranged on the central axis of the bottom end of the cleaning and scraping component, and the central axis extends into the positioning hole to ensure that the cleaning and scraping component is always on the central axis when rotating. A through hole is arranged on one side of the flow guiding and positioning device, and the through hole is docked with the drain port. The bottom surface of the flow guiding and positioning device is inclined at a certain angle and inclined towards the through hole and the drain port direction, so that sewage can be discharged smoothly from the drain port during sewage discharge. A process hole is arranged on the side wall of the container part opposite to the drain port, and a process hole plug is installed at the process hole. A convex body is arranged at the inner end of the process hole plug, and the convex body and a concave hole arranged at the corresponding part on the flow guiding and positioning device cooperate with each other to form further positioning and locking of the flow guiding and positioning device.

[0004] The above-mentioned pre-filter can regularly and automatically scrape and remove impurities on the filter screen, achieving synchronous cleaning and sewage discharge, improving the convenience of cleaning the pre-filter itself, and correspondingly extending the service life of the equipment. However, the setting of the reduction motor, the cleaning and scraping component, the electronic controller, and the electric sewage valve increases the production cost. Moreover, the cleaning and scraping component is arranged inside the filter cartridge and abuts against the inner side wall of the filter cartridge, which to a certain extent affects the filtering efficiency of the filter cartridge. Summary of the Invention

[0005] Therefore, in view of the above problems, the present invention provides a pre-filter, which mainly solves the problems of high production cost and low filtering efficiency of the pre-filter in the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A pre-filter includes a housing, a filter cover, a rotating cover, a metal support ring, a connecting plate, a switching mechanism, and a filtering mechanism. The housing has a chamber, an upper port and a lower port communicating with the chamber. An inlet and an outlet are respectively provided on the side surface of the housing. The rotating cover is rotatably covered on the upper port of the housing, and a sewage discharge port is provided on the rotating cover. The filter cover is connected to the housing through the metal support ring, and the interior of the chamber is communicated with the interior of the filter cover through the lower port. The switching mechanism is arranged in the chamber and connected to the rotating cover. The switching mechanism has a first water inlet assembly, a second water inlet assembly, a water outlet assembly, and a sewage discharge assembly. The connecting plate is arranged on the switching mechanism and distributed at the lower port. First through hole, second through hole, third through hole, and fourth through hole are respectively provided on the connecting plate. The filtering mechanism is arranged on the connecting plate and distributed in the filter cover, and divides the interior of the filter cover into an inner chamber and an outer chamber. When the rotating cover rotates 0°, the inlet is communicated with the inner chamber through the first water inlet assembly and the first through hole, and the outlet is communicated with the outer chamber through the water outlet assembly and the second through hole. When the rotating cover rotates 90°, the inlet is communicated with the outer chamber through the second water inlet assembly and the third through hole, and the sewage discharge port is communicated with the inner chamber through the sewage discharge assembly and the fourth through hole. When the rotating cover rotates 180°, the inlet, the outlet, and the sewage discharge port are closed.

[0008] Further, the filtering mechanism includes a filtering frame, a first elastic filtering layer, and a second elastic filtering layer. The filtering frame is provided with an adjusting component. The first elastic filtering layer is sleeved on the filtering frame, and the second elastic filtering layer is sleeved on the first elastic filtering layer. The first elastic filtering layer includes a plurality of elastic rings arranged along its axial direction. Filtering gaps are formed between adjacent elastic rings. The adjusting component abuts against one axial end of the first elastic filtering layer, and the extrusion force between adjacent elastic rings is adjusted through the adjusting component. The second elastic filtering layer is provided with a plurality of filtering holes, and the filtering gaps of the first elastic filtering layer and the filtering holes of the second elastic filtering layer are distributed in a staggered manner.

[0009] Further, first serrated portions and second serrated portions are respectively provided on the axial end faces of both ends of each elastic ring, and the first serrated portions and the second serrated portions on adjacent elastic rings are meshed and connected.

[0010] Further, the filtering frame includes an upper plate body, a lower plate body, and at least three guide rods. The upper plate body is fixedly arranged on the connecting plate. The upper plate body is provided with connection holes respectively communicating with the first through hole and the fourth through hole. The upper ends of the guide rods are fixedly arranged on the upper plate body. The lower plate body is slidably arranged on the guide rods. The adjusting component includes an adjusting screw rod, an adjusting nut, and a sliding plate. The upper end of the adjusting screw rod is fixedly arranged in the middle of the upper plate body and is distributed parallel to the guide rods. The sliding plate is slidably arranged on the guide rods and is distributed between the upper plate body and the lower plate body. The adjusting nut is connected to the lower part of the adjusting screw rod and abuts against the lower surface of the lower plate body.

[0011] Further, an embedding groove for embedding and clamping the lower end of the adjusting screw rod is arranged inside the filtering cover.

[0012] Further, a plurality of annular corrugated portions protruding radially outward are arranged at intervals in the axial direction of the second elastic filtering layer. Filtering portions are formed between adjacent corrugated portions. The filtering holes are arranged in a ring shape on each filtering portion. The elastic modulus of the corrugated portions is smaller than that of the filtering portions.

[0013] Further, the cross section of the corrugated portion is in a semi-circular structure. A circular structure having the same radius of curvature as that of the corrugated portion is defined as a reference circle. The ratio of the arc length dimension of the cross section of the corrugated portion to the circumference dimension of the reference circle is 3:5 to 3:4.

[0014] Further, the switching mechanism includes a switching housing rotatably arranged in the chamber and an end cover covering the upper port. The end cover connects the switching housing and the rotating cover. The first water inlet component, the second water inlet component, and the water outlet component are arranged in a ring shape inside the switching housing and are close to one side of the lower port. The sewage discharge component is arranged inside the switching housing and is distributed along the direction from the upper port to the lower port.

[0015] Further, the first water inlet assembly includes a first water inlet through hole provided on the side surface of the switching housing and opposite to the water inlet, a first water inlet pipe connecting the first water inlet through hole and the first through hole, and a pressure balance assembly for balancing the internal pressure of the filtering mechanism. The first water inlet pipe includes a first pipe body and a second pipe body. The central axis of the first pipe body is perpendicularly distributed to the central axis of the second pipe body. An axial end of the first pipe body away from the first water inlet through hole protrudes outward to form a buffer cavity. The pressure balance assembly is provided at the connection between the first pipe body and the second pipe body.

[0016] Further, the pressure balance assembly includes a mounting groove provided on the side surface of the first pipe body. A first spring and a balance plunger are provided in the mounting groove. The balance plunger includes a first part and a second part integrally connected. The first part has a cylindrical structure. The upper end surface of the second part is connected to the first part. The side surface of the second part has a curved surface structure, and the area of the upper end surface of the second part is smaller than the area of the lower end surface.

[0017] By adopting the foregoing technical solutions, the beneficial effects of the present utility model are as follows: In this pre-filter, through the settings of the rotary cover and the switching mechanism, the switching of the filtering mode, self-cleaning mode, and closing mode of the filter is realized. Its structure is simple, easy to use, has a low production cost, and a high filtering efficiency. Specifically, when the rotary cover rotates 0°, the water inlet is communicated with the inner chamber through the first water inlet assembly and the first through hole, and the water outlet is communicated with the outer chamber through the water outlet assembly and the second through hole. Tap water enters the inner chamber of the filtering mechanism through the water inlet, the first water inlet assembly, and the first through hole, is filtered by the filtering mechanism and then enters the outer chamber, and is discharged through the second through hole, the water outlet assembly, and the water outlet to realize the filtration of tap water; when the rotary cover rotates 90°, the water inlet is communicated with the outer chamber through the second water inlet assembly and the third through hole, and the sewage outlet is communicated with the inner chamber through the sewage discharge assembly and the fourth through hole. Tap water enters the outer chamber through the water inlet, the second water inlet assembly, and the third through hole to backwash the filtering mechanism in the reverse direction, and the tap water in the inner chamber carries a large amount of impurities and is discharged through the fourth through hole, the sewage discharge assembly, and the sewage outlet to realize self-cleaning. This kind of reverse flushing can remove the impurities adhering to the filtering mechanism, and omits the step of disassembling the filter, with high use convenience. And compared with installing an electric cleaning device, its production cost is greatly reduced, and by changing the flow path of tap water, the discharge of sewage is realized, ensuring cleanliness. Description of the Drawings

[0018] Figure 1 is the front view structural schematic diagram of the embodiment of the present utility model;

[0019] Figure 2 is the top view structural schematic diagram of the embodiment of the present utility model;

[0020] Figure 3It is a front view structural schematic diagram of the filter cover omitted in the embodiment of the present utility model;

[0021] Figure 4 It is a structural schematic diagram of the second elastic filter layer omitted in the filter mechanism in the embodiment of the present utility model;

[0022] Figure 5 It is Figure 3 A sectional structural schematic diagram in the state where no pressure is applied to the adjustment component at A in

[0023] Figure 6 It is Figure 3 A sectional structural schematic diagram in the state where pressure is applied to the adjustment component at A in

[0024] Figure 7 It is Figure 4 A partial enlarged view at B in

[0025] Figure 8 It is a sectional structural schematic diagram in the filtering mode in the embodiment of the present utility model;

[0026] Figure 9 It is a sectional structural schematic diagram in the self-cleaning mode in the embodiment of the present utility model;

[0027] Figure 10 It is a sectional structural schematic diagram of the filter rack in the embodiment of the present utility model.

[0028] Explanation of reference numerals:

[0029] 1. Housing; 2. Filter cover; 3. Rotating cover; 4. Metal support ring; 5. Connecting plate; 6. First metal interface; 7. Second metal interface; 8. Switching mechanism; 9. Filter mechanism; 10. Chamber; 11. Upper port; 12. Lower port; 13. Water inlet; 14. Water outlet; 20. Embedded groove; 21. Inner chamber; 22. Outer chamber; 30. Drain port; 40. Vibration assembly;

[0030] 51. First through hole; 52. Second through hole; 53. Third through hole; 54. Fourth through hole;

[0031] 81. First water inlet assembly; 82. Second water inlet assembly; 83. Water outlet assembly; 84. Drainage assembly; 85. Switching housing; 86. End cover;

[0032] 91. Filter rack; 92. First elastic filter layer; 93. Second elastic filter layer;

[0033] 101. First pipe body; 102. Second pipe body; 201. First part; 202. Second part; 401. Relief groove; 402. Second spring; 403. Thumb rod; 404. Groove;

[0034] 811, First water inlet through hole; 812, First water inlet pipe; 813, Buffer chamber; 814, Installation groove; 815, First spring; 816, Balance plunger; 821, Second water inlet through hole; 822, Second water inlet pipe; 831, Water outlet through hole; 832, Water outlet pipe; 841, First sewage discharge through hole; 842, Second sewage discharge through hole; 843, Sewage discharge pipe;

[0035] 911, Upper plate body; 912, Lower plate body; 913, Guide rod; 914, Connection hole; 915, Adjusting screw; 916, Adjusting nut; 917, Slide plate; 921, Elastic ring; 922, Filter gap; 923, First serrated part; 924, Second serrated part; 931, Filter hole; 932, Pleated part; 933, Filter part. Detailed implementation mode

[0036] The present utility model will be further described in conjunction with the accompanying drawings and the detailed implementation mode.

[0037] An embodiment of the present utility model is as follows:

[0038] Reference Figures 1 to 10As shown in the figure, a pre-filter includes a housing 1, a filter cover 2, a rotary cover 3, a metal support ring 4, a connecting plate 5, a first metal interface 6, a second metal interface 7, a switching mechanism 8, and a filtering mechanism 9. The housing 1 has a chamber 10, an upper port 11 and a lower port 12 communicating with the chamber 10. An inlet 13 and an outlet 14 are respectively provided on the side of the housing 1. The first metal interface 6 is connected to the inlet 13, and the second metal interface 7 is connected to the outlet 14. The rotary cover 3 is rotatably disposed on the upper port 11 of the housing 1, and a sewage discharge port 30 is provided on the rotary cover 3. The filter cover 2 is connected to the housing 1 through the metal support ring 4, and the interior of the chamber 10 and the filter cover 2 are communicated through the lower port 12. The switching mechanism 8 is disposed in the chamber 10 and connected to the rotary cover 3. The switching mechanism 8 has a first water inlet assembly 81, a second water inlet assembly 82, a water outlet assembly 83, and a sewage discharge assembly 84. The connecting plate 5 is disposed on the switching mechanism 8 and distributed at the lower port 12. A first through hole 51, a second through hole 52, a third through hole 53, and a fourth through hole 54 are respectively provided on the connecting plate 5. The filtering mechanism 9 is disposed on the connecting plate 5 and distributed in the filter cover 2, and divides the interior of the filter cover 2 into an inner chamber 21 and an outer chamber 22. When the rotary cover 3 rotates 0°, the inlet 13 communicates with the inner chamber 21 through the first water inlet assembly 81 and the first through hole 51, and the outlet 14 communicates with the outer chamber 22 through the water outlet assembly 83 and the second through hole 52. When the rotary cover 3 rotates 90°, the inlet 13 communicates with the outer chamber 22 through the second water inlet assembly 82 and the third through hole 53, and the sewage discharge port 30 communicates with the inner chamber 21 through the sewage discharge assembly 84 and the fourth through hole 54. When the rotary cover 3 rotates 180°, the inlet 13, the outlet 14, and the sewage discharge port 30 are closed.

[0039] This pre-filter realizes the mode switching of the filter's filtration mode, self-cleaning mode, and shutdown mode through the settings of the rotating cover 3 and the switching mechanism 8. It has a simple structure, is easy to use, has a low production cost, and a high filtration efficiency. Specifically, when the rotating cover 3 rotates 0°, the water inlet 13 is connected to the inner chamber 21 through the first water inlet assembly 81 and the first through hole 51, and the water outlet 14 is connected to the outer chamber 22 through the water outlet assembly 83 and the second through hole 52. Tap water enters the inner chamber 21 of the filtering mechanism through the water inlet 13, the first water inlet assembly 81, and the first through hole 51, is filtered by the filtering mechanism 9 and then enters the outer chamber 22, and is discharged through the second through hole 52, the water outlet assembly 83, and the water outlet 14 to realize the filtration of tap water. When the rotating cover 3 rotates 90°, the water inlet 13 is connected to the outer chamber 22 through the second water inlet assembly 82 and the third through hole 53, and the sewage outlet 30 is connected to the inner chamber 21 through the sewage discharge assembly 84 and the fourth through hole 54. Tap water enters the outer chamber 22 through the water inlet 13, the second water inlet assembly 82, and the third through hole 53 to backwash the filtering mechanism in the reverse direction, and the tap water in the inner chamber 21 carrying a large amount of impurities is discharged through the fourth through hole 54, the sewage discharge assembly 84, and the sewage outlet 30 to realize self-cleaning. This kind of reverse flushing can remove the impurities adhering to the filtering mechanism 9, omits the step of disassembling the filter, has a high convenience of use, and compared with installing an electric cleaning device, its production cost is greatly reduced. And by changing the flow path of tap water, the discharge of sewage is realized to ensure cleanliness.

[0040] Specifically, the filtering mechanism 9 includes a filter frame 91, a first elastic filter layer 92, and a second elastic filter layer 93. The filter frame 91 is provided with an adjusting component. The first elastic filter layer 92 is sleeved on the filter frame 91, and the second elastic filter layer 93 is sleeved on the first elastic filter layer 92. The first elastic filter layer 92 includes a plurality of elastic rings 921 arranged along its axial direction. A filtering gap 922 is formed between two adjacent elastic rings 921. The adjusting component abuts against one axial end of the first elastic filter layer 92, and the extrusion force between two adjacent elastic rings 921 is adjusted through the adjusting component. The second elastic filter layer 93 is provided with a plurality of filter holes 931. The filtering gaps 922 of the first elastic filter layer 92 and the filter holes 931 of the second elastic filter layer 93 are distributed in a staggered manner. First sawtooth portions 923 and second sawtooth portions 924 are respectively provided on the axial two end faces of each elastic ring 921, and the first sawtooth portions 923 and the second sawtooth portions 924 on two adjacent elastic rings 921 are meshed and connected.

[0041] Moreover, the filter rack 91 includes an upper plate body 911, a lower plate body 912 and three guide rods 913. The upper plate body 911 is fixedly arranged on the connecting plate 5. A connecting hole 914 communicating with the first through hole 51 and the fourth through hole 54 respectively is arranged on the upper plate body 911. The upper ends of the guide rods 913 are fixedly arranged on the upper plate body 911. The lower plate body 912 is slidably arranged on the guide rods 913. The adjusting assembly includes an adjusting screw rod 915, an adjusting nut 916 and a sliding plate 917. The upper end of the adjusting screw rod 915 is fixedly arranged in the middle of the upper plate body 911 and is parallel to the guide rods 913. The sliding plate 917 is slidably arranged on the guide rods 913 and is distributed between the upper plate body 911 and the lower plate body 912. The adjusting nut 916 is connected to the lower part of the adjusting screw rod 915 and abuts against the lower surface of the lower plate body 912. An embedding groove 20 for embedding and clamping the lower end of the adjusting screw rod 915 is arranged inside the filter cover 2.

[0042] Furthermore, a plurality of annular folding parts 932 protruding radially outward are arranged at intervals in the axial direction of the second elastic filter layer 93. A filtering part 933 is formed between two adjacent folding parts 932. The filtering holes 931 are arranged in a ring shape on each filtering part 933. The elastic coefficient of the folding part 932 is smaller than that of the filtering part 933. The cross section of the folding part 932 is in a semi-circular structure. A circular structure with the same radius of curvature as that of the folding part 932 is defined as a reference circle a. The ratio of the arc length dimension of the cross section of the folding part 932 to the circumference dimension of the reference circle a is 3:5 to 3:4, preferably 3:4.

[0043] In use, by rotating the adjusting nut 916, the lower plate body 912 and the sliding plate 917 are driven to slide up and down along the guide rod 913, so that the extrusion pressure between two adjacent elastic rings 921 on the first elastic filter layer 92 changes, that is, the pressure at which tap water seeps out through the filter gap 922 changes, and the filtering diameter of the filter gap 922 changes. At the same time, the pleated portion 932 on the second elastic filter layer 93 is squeezed or stretched, so that the shielding area of the filter holes 931 on the filter portion 933 between two adjacent pleated portions 932 changes, thereby stabilizing the pressure of the tap water in the inner chamber 21. In use, the tap water uses a certain amount of potential energy to do work, pushing open the elastic ring 921, and thus seeping outwards through the filter gap 922 on the first elastic filter layer 92. Impurities with a larger diameter are caught on the filter gap 922 between the elastic rings 921. The meshing connection between the first serrated portion 923 and the second serrated portion 924 can increase the contact area between two adjacent elastic rings 921, thereby increasing the length of the filter gap 922, and thus improving the filtering efficiency. Moreover, secondary filtration is carried out through the filter holes 931 on the second elastic filter layer 93. At the same time, the pleated portion 932 on the second elastic filter layer 93 occupies the front space of the filter holes 931 after being squeezed, so that the filtering path changes, which can improve the filtering effect, realize slight vibration and swinging of the first elastic filter layer 92 and the second elastic filter layer 93 during the filtering process, reduce the adhesion of impurities, and improve the filtering efficiency.

[0044] Moreover, the switching mechanism 8 includes a switching housing 85 rotatably disposed in the chamber 10 and an end cap 86 covering the upper port 11. The end cap 86 connects the switching housing 85 and the rotating cover 3. The first water inlet assembly 81, the second water inlet assembly 82, and the water outlet assembly 83 are arranged annularly in the switching housing 85 and are close to the side of the lower port 12. The sewage discharge assembly 84 is disposed in the switching housing 85 and is distributed along the direction from the upper port 11 to the lower port 12. The first water inlet assembly 81 includes a first water inlet through hole 811 disposed on the side surface of the switching housing 85 and opposite to the water inlet 13, a first water inlet pipe 812 connecting the first water inlet through hole 811 and the first through hole 51, and a pressure balance assembly for balancing the internal pressure of the filtering mechanism 9. The first water inlet pipe 812 includes a first pipe body 101 and a second pipe body 102. The central axis of the first pipe body 101 is perpendicularly distributed to the central axis of the second pipe body 102. An axial end of the first pipe body 101 far from the first water inlet through hole 811 protrudes outward to form a buffer chamber 813. The pressure balance assembly is disposed at the connection between the first pipe body 101 and the second pipe body 102. The pressure balance assembly includes a mounting groove 814 disposed on the side surface of the first pipe body 101. A first spring 815 and a balance plunger 816 are disposed in the mounting groove 814. The balance plunger 816 includes a first part 201 and a second part 202 integrally connected. The first part 201 has a cylindrical structure. The upper end surface of the second part 202 is connected to the first part 201. The side surface of the second part 202 has a curved surface structure, and the area of the upper end surface of the second part 202 is smaller than the area of the lower end surface. The second water inlet assembly 82 includes a second water inlet through hole 821 disposed on the side surface of the switching housing 85 and opposite to the water inlet 13, and a second water inlet pipe 822 connecting the second water inlet through hole 821 and the third through hole 53. The water outlet assembly 83 includes a water outlet through hole 831 disposed on the side surface of the switching housing 85 and opposite to the water outlet 14, and a water outlet pipe 832 connecting the water outlet through hole 831 and the second through hole 52. The sewage discharge assembly 84 includes a first sewage discharge through hole 841 disposed on the lower end surface of the switching housing 85 and opposite to the fourth through hole 54, a second sewage discharge through hole 842 disposed on the upper end surface of the switching housing 85 and connected to the sewage discharge port 30, and a sewage discharge pipe 843 connecting the first sewage discharge through hole 841 and the second sewage discharge through hole 842.

[0045] In use, since the side surface of the second part 202 of the balance plunger 816 has a curved surface structure, and the area of the upper end surface of the second part 202 is smaller than that of the lower end surface, the acting area with tap water is increased, and the lifting efficiency of the balance plunger 816 is increased. Thus, tap water enters the first water inlet pipe 812 from the water inlet 13. Under the action of the tap water pressure, the second part 202 of the balance plunger 816 can lift the balance plunger 816 and overcome the lifting force through the action of the first spring 815, so as to balance the pressure of the tap water entering the inner chamber 21 and combine with the regulating component, thereby controlling the filtering speed of the tap water and improving the filtering effect.

[0046] In this embodiment, a vibration assembly 40 for driving the filtering mechanism 9 to vibrate is provided between the switching housing 85 and the connecting plate 5. The vibration assembly 40 includes a relief groove 401 recessed in the lower end surface of the switching housing 85, a second spring 402 disposed in the relief groove 401, a push rod 403 slidable along the relief groove 401, and a groove 404 annularly distributed on the upper surface of the connecting plate 5. The central axis of the push rod 403 is parallel to the central axis of the switching housing 85, and the distance between the central axis of the push rod 403 and the switching housing 85 is 8 mm. The lower end of the push rod 403 abuts against the groove 404 through the second spring 402. By rotating the switching housing 85, the push rod 403 is driven to rotate. Under the action of the groove 404 and the second spring 402, the push rod 403 performs telescopic movement, thereby hitting the connecting plate 5 and the filtering mechanism 9, so that the impurities adhering to the filtering mechanism 9 fall off, further improving the filtering effect.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0048] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0050] Although the present utility model is specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present utility model in terms of form and details without departing from the spirit and scope of the present utility model defined by the appended claims, and all such changes are within the protection scope of the present utility model.

Claims

1. A pre-filter, characterized in that: The invention comprises a shell, a filter cover, a rotating cover, a metal support ring, a connecting plate, a switching mechanism and a filtering mechanism. The shell has a chamber and an upper port and a lower port connected to the chamber. The sides of the shell are respectively provided with a water inlet and a water outlet. The rotating cover is rotatably covered on the upper port of the shell. The rotating cover is provided with a sewage outlet. The filter cover is connected to the shell through a metal support ring, and the chamber is connected to the interior of the filter cover through the lower port. The switching mechanism is arranged in the chamber and connected to the rotating cover. The switching mechanism has a first water inlet component, a second water inlet component, a water outlet component and a sewage outlet component. The connecting plate is arranged on the switching mechanism. The first through hole, the second through hole, the third through hole and the fourth through hole are respectively arranged on the connecting plate, the filtering mechanism is arranged on the connecting plate and distributed in the filtering cover, and the interior of the filtering cover is divided into an inner chamber and an outer chamber, when the rotating cover rotates 0°, the water inlet is communicated with the inner chamber through the first water inlet component and the first through hole, and the water outlet is communicated with the outer chamber through the water outlet component and the second through hole; when the rotating cover rotates 90°, the water inlet is communicated with the outer chamber through the second water inlet component and the third through hole, and the sewage outlet is communicated with the inner chamber through the sewage outlet component and the fourth through hole; when the rotating cover rotates 180°, the water inlet, the water outlet and the sewage outlet are closed; The filter mechanism includes a filter frame, a first elastic filter layer and a second elastic filter layer. The filter frame is provided with an adjustment component. The first elastic filter layer is sleeved on the filter frame, and the second elastic filter layer is sleeved on the first elastic filter layer. The first elastic filter layer includes a plurality of elastic rings arranged along its axial direction, and a filter gap is formed between two adjacent elastic rings. The adjustment component is against one axial end of the first elastic filter layer, and the extrusion force between the two adjacent elastic rings is adjusted by the adjustment component. The second elastic filter layer is provided with a plurality of filter holes, and the filter gap of the first elastic filter layer and the filter hole of the second elastic filter layer are staggered.

2. The pre-filter according to claim 1, characterized in that: A first sawtooth portion and a second sawtooth portion are respectively provided on both axial end surfaces of each elastic ring, and the first sawtooth portions on two adjacent elastic rings are meshedly connected with the second sawtooth portions.

3. The pre-filter according to claim 2, characterized in that: The filter frame includes an upper plate body, a lower plate body and at least three guide rods, the upper plate body is fixedly mounted on the connecting plate, the upper plate body is provided with connecting holes which are respectively connected with the first through hole and the fourth through hole, the upper end of each guide rod is fixedly mounted on the upper plate body, the lower plate body is slidably mounted on the guide rod, the adjustment assembly includes an adjusting screw, an adjusting nut and a slide plate, the upper end of the adjusting screw is fixedly mounted on the middle part of the upper plate body and is distributed parallel to the guide rod, the slide plate is slidably mounted on the guide rod and is distributed between the upper plate body and the lower plate body, the adjusting nut is connected to the lower part of the adjusting screw, and it abuts against the lower surface of the lower plate body.

4. The pre-filter according to claim 3, characterized in that: An embedding groove for the lower end of the adjusting screw to be embedded and clamped is arranged inside the filter cover.

5. The pre-filter according to any one of claims 1 to 4, characterized in that: The second elastic filter layer is provided with a plurality of annular pleated portions protruding radially outward at intervals in the axial direction, a filter portion is formed between two adjacent pleated portions, the filter hole ring is provided on each filter portion, and the elastic coefficient of the pleated portion is smaller than the elastic coefficient of the filter portion.

6. The pre-filter according to claim 5, characterized in that: The cross section of the fold portion is a semicircular structure, a circular structure with the same curvature radius as the fold portion is defined as a reference circle, and the ratio of the arc length of the cross section of the fold portion to the circumference of the reference circle is 3:5 to 3:

4.

7. The pre-filter according to claim 6, characterized in that: The switching mechanism includes a switching shell rotatably arranged in the chamber and an end cover arranged at the upper port, the end cover connects the switching shell and the rotating cover, the first water inlet assembly, the second water inlet assembly and the water outlet assembly are arranged in a ring in the switching shell and close to the lower port side, and the sewage discharge assembly is arranged in the switching shell and distributed along the direction from the upper port to the lower port.

8. The pre-filter according to claim 7, characterized in that: The first water inlet assembly includes a first water inlet through hole arranged on the side of the switching shell and opposite to the water inlet, a first water inlet pipe connecting the first water inlet through hole and the first through hole, and a pressure balancing assembly for balancing the internal pressure of the filtering mechanism. The first water inlet pipe includes a first tube body and a second tube body. The central axis of the first tube body is vertically distributed with the central axis of the second tube body. A buffer cavity is protruding outward from the axial end of the first tube body away from the first water inlet through hole. The pressure balancing assembly is arranged at the connection between the first tube body and the second tube body.

9. The pre-filter according to claim 8, characterized in that: The pressure balancing assembly includes a mounting groove on the side of a first tube body, a first spring and a balancing plunger are arranged in the mounting groove, the balancing plunger includes a first part and a second part connected as one piece, the first part is a cylindrical structure, the upper end surface of the second part is connected to the first part, the side of the second part is a curved structure, and the area of ​​the upper end surface of the second part is smaller than the area of ​​the lower end surface.

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