A filter and water inlet valve, water tank device and flushing device without disassembly and washing

Abstract

The application discloses a filter without disassembly and washing, a water inlet valve, a water tank device and a flushing device. The filter comprises a shell, a filter screen, the shell is provided with a water inlet, a water outlet and a sewage outlet, and the filter screen is arranged in the shell. The filter further comprises a switching piece which is movably arranged in the shell and is used for switching the flowing direction of water in the shell, so that the filter screen is in a filtering state or a flushing state. In the filtering state, water flows from the raw water side of the filter screen to the clean water side of the filter screen through the filter screen and flows out of the water outlet. In the flushing state, at least part of water flows from the clean water side of the filter screen to the raw water side of the filter screen through the filter screen and is discharged from the sewage outlet. The application can perform reverse flushing on the filter screen, greatly improves the cleaning effect of the filter screen, does not need to make water flow reversely into the shell, thereby does not need to provide a power component for making water flow reversely and the like, and makes the overall structure simpler and the cost lower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filters, in particular to a filter free to disassemble and wash, a water inlet valve, a water tank device and a flushing device. BACKGROUND

[0002] The water in tap water often contains impurities, which can easily cause the fittings on the water inlet pipeline or flushing pipeline of sanitary wares to be blocked, damaged, etc. Therefore, many sanitary products, such as the water inlet valve of a toilet and the water tank device of a toilet, generally have a filter or filter screen to filter the impurities in the water. However, the filter screen needs to be cleaned regularly to prevent the screen holes from being blocked by impurities and affecting water flow. Currently, the cleaning methods for filter screens mainly include the following three methods:

[0003] 1. Disassemble and clean the filter screen, such as the water inlet valve disclosed in application No. 201910819630.4, which has a filter screen arranged on the upper end of the valve body and located at the front end of the control valve inlet of the water inlet valve. When the filter screen needs to be disassembled and cleaned, it can be directly disassembled by rotating the top of the valve body. Although it is convenient to disassemble and assemble without the need to remove the entire valve body, the filter screen needs to be manually cleaned after disassembly, which is time-consuming and labor-intensive. In addition, the water inlet pipeline needs to be closed before disassembling the filter screen, otherwise water may splash and wet the person and / or the surrounding environment.

[0004] 2. Discharge the impurities trapped by the filter screen, such as the filter disclosed in application No. 201920808639.0, which has a sewage discharge port and a movable water sealing assembly on the filter body. The water sealing assembly is driven to open and close the sewage discharge port, and when the sewage discharge port is opened, the impurities trapped by the filter screen can be discharged from the sewage discharge port. However, this method uses the water flow to flush the filter screen in the forward direction to flush the impurities out of the sewage discharge port. Obviously, it cannot completely flush the impurities trapped by the filter screen, and thus there is a problem of incomplete cleaning of the filter screen.

[0005] 3. Reverse flushing of the filter screen, such as the toilet flushing system disclosed in application No. 202122034460.4, which has a reverse flushing passage to clean the impurities on the filter screen in time. However, this method requires a liquid storage pump to provide the power for the reverse flow of water, and a reversing valve to realize the reverse flow of water into the filter. This results in a complex overall structure and high cost. SUMMARY

[0006] The present application provides a filter free to disassemble and wash, a water inlet valve, a water tank device and a flushing device, which can reverse flush the filter screen without the need for water to flow into the filter in the reverse direction.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a filter that does not require disassembly and cleaning, comprising a housing and a filter screen, the housing having an inlet, an outlet, and a drain outlet communicating with its internal cavity, the filter screen being installed inside the housing; it also includes a switching component, which is movably disposed within the housing and is used to switch the flow direction of water within the housing, so that the filter screen is in a filtering state or a rinsing state. In the filtering state, water flows from the raw water side of the filter screen through the filter screen to the clean water side of the filter screen and flows out from the outlet; in the rinsing state, at least a portion of the water flows from the clean water side of the filter screen through the filter screen to the raw water side of the filter screen and is discharged from the drain outlet.

[0008] Furthermore, it also includes a scraper, which is movably disposed within the housing and located on the raw water side of the filter screen, and the scraper removes impurities from the filter screen by moving relative to the filter screen.

[0009] Furthermore, the filter screen is cylindrical, the switching element is sleeved with the filter screen, and the switching element switches the flow direction of water in the housing by rotation; the scraper is sleeved with the filter screen, and the scraper removes impurities from the filter screen by rotation.

[0010] Furthermore, the switching component is fitted over the filter screen, and the scraping component is located inside the switching component and fitted over the filter screen; the scraping component is provided with a plurality of scraping strips distributed at intervals along its circumference, and each scraping strip extends along the axial direction of the filter screen.

[0011] Furthermore, the switching component is provided with a first water passage structure and a second water passage structure. In the filtration state, water entering the housing flows to the raw water side of the filter screen through the first water passage structure. In the rinsing state, water entering the housing flows to the clean water side of the filter screen through the second water passage structure.

[0012] Furthermore, the second water passage structure is located on the raw water side of the filter screen, so that in the rinsing state, the water flowing to the second water passage structure is first filtered by the filter screen and then flows to the clean water side of the filter screen.

[0013] Furthermore, the scraper is driven by the water flow entering the housing to move relative to the filter screen; it also includes a water distribution component disposed in the housing, which has a water inlet groove connected to the water inlet and multiple inclined water channels. The multiple inclined water channels are distributed circumferentially along the water distribution component and connected to the water inlet groove. An impeller is provided at one end of the scraper near the water distribution component. After the water flows out from the inclined water channels, it impacts the impeller, causing the impeller to drive the scraper to rotate.

[0014] Furthermore, one end of the switching component is provided with a first water-passing structure and a second water-passing structure distributed circumferentially thereon. The first water-passing structure includes multiple water inlets, which open into the inner cavity of the switching component. In the filtration state, the water inlets are connected to the inclined water channel, and water flows through the water inlets to the raw water side of the filter screen. The second water-passing structure includes multiple water-passing grooves, each extending radially along the switching component. In the rinsing state, the water-passing grooves are connected to the inclined water channel, and water flows through the water-passing grooves to the clean water side of the filter screen. One end of the switching component is located between the impeller and the water distributor.

[0015] Furthermore, in the filtration state, the switching element blocks the drain outlet; in the flushing state, the switching element opens the drain outlet; and / or, the switching element is partially located outside the housing and can be driven; the portion of the switching element outside the housing is an arc-shaped piece extending circumferentially, and the outer surface of the arc-shaped piece is provided with an anti-slip structure.

[0016] The present invention also provides a water inlet valve, including a water inlet valve body and a filter as described above, which is designed to be easy to clean without disassembly. The housing is disposed on the water inlet pipe of the water inlet valve body, so that the filter filters the water entering the water inlet pipe.

[0017] The present invention also provides a water tank device, including a water tank and an inlet valve for replenishing water to the water tank, and further including a non-disassembly and cleaning filter as described above, wherein the filter is installed upstream of the inlet valve so that water flows to the inlet valve after being filtered by the filter.

[0018] The present invention also provides a flushing device, including a flushing valve and a non-disassembly-cleaning filter as described above, wherein the filter is installed upstream of the flushing valve so that water flows to the flushing valve after being filtered by the filter.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Because this invention also includes a switching component, which is movably disposed within the housing and used to switch the flow direction of water within the housing, allowing the filter screen to be in either a filtering or rinsing state, this invention can perform backwashing of the filter screen, thereby greatly improving the cleaning effect of the filter screen, effectively preventing impurities from clogging the filter screen's mesh, and ensuring the filter screen's service life and the normal water output of the housing. Furthermore, this invention only requires the switching component to change the flow direction of water within the housing to achieve both normal filtration and backwashing of the filter screen, thus eliminating the need for water to flow backward into the housing. This eliminates the need for power components and reversing components to reverse the water flow, resulting in a simpler overall structure and lower cost.

[0021] 2. The present invention further includes the aforementioned scraper, which is capable of scraping off impurities adhering to the surface of the filter screen on the raw water side, thereby further improving the cleaning effect of the filter screen. In particular, the scraper is driven by water flow, which ensures that the scraper can automatically perform scraping action every time water enters the filter, thereby further ensuring the cleaning effect of the filter screen and the normal water output of the housing.

[0022] 3. The second water passage structure is located on the raw water side of the filter screen. In the rinsing state, the water flowing to the second water passage structure is filtered by the filter screen before flowing to the clean water side of the filter screen. This ensures that the water entering the clean water side of the filter screen is always filtered water rather than raw water, thereby avoiding the introduction of impurities in the raw water into the clean water side of the filter screen, and thus ensuring the quality of the water output from the housing.

[0023] 4. The water distribution component not only allows the water flow to better drive the scraper, but also cooperates with the first and second water passage structures of the switching component to enable the switching component to better switch the flow direction of water in the housing.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the present invention's non-disassembly and cleaning-free filter, inlet valve, water tank device, and flushing device are not limited to the embodiments. Attached Figure Description

[0025] Figure 1 This is an exploded view of the water inlet valve of the present invention;

[0026] Figure 2 This is a three-dimensional structural diagram of the switching component of the present invention. Figure 1 ;

[0027] Figure 3 This is a three-dimensional structural diagram of the switching component of the present invention. Figure 2 ;

[0028] Figure 4 This is a three-dimensional structural schematic diagram of the scraper component of the present invention;

[0029] Figure 5 This is a three-dimensional structural schematic diagram of the water distribution component of the present invention;

[0030] Figure 6 This is a three-dimensional structural schematic diagram of the water inlet valve of the present invention;

[0031] Figure 7 This is a top view of the water inlet valve of the present invention in the open state;

[0032] Figure 8 yes Figure 7 AA section view;

[0033] Figure 9 yes Figure 8An enlarged schematic diagram of section D in the middle;

[0034] Figure 10 yes Figure 8 BB section view;

[0035] Figure 11 This is a top view of the water inlet valve of the present invention in the closed state;

[0036] Figure 12 yes Figure 11 CC section view;

[0037] Figure 13 yes Figure 12 An enlarged schematic diagram of section E in the middle;

[0038] Figure 14 This is a simplified schematic diagram of the water tank device of the present invention;

[0039] Figure 15 This is a simplified schematic diagram of the rinsing device of the present invention;

[0040] The components include: 1. Shell; 11. Main shell; 111. Inlet; 112. Drain; 12. Cover; 121. Outlet; 2. Filter screen; 3. Switching component; 31. Water inlet; 32. Water channel; 33. Arc-shaped plate; 34. Through hole; 35. Protective rib; 36. Sealing component; 37. Sealing ring; 4. Scraper component; 41. Scraper strip; 42. Impeller; 421. Spiral blade; 43. Small hole; 5. Water distribution component; 51. Inlet channel; 52. Inclined water channel; 6. Water-stopping assembly; 61. 62. Valve body, 63. Upper guide pipe, 64. Water-stop rubber gasket, 7. Water-stop cover, 8. Lower guide pipe, 9. Upper sleeve, 10. Lower sleeve, 11. Float assembly, 12. Float, 13. Adjusting rod, 14. Lifting rod, 20. Upper rubber gasket, 20. Mounting assembly, 201. Flange, 202. Triangular gasket, 203. Locking nut, 30. Anti-siphon assembly, 301. Anti-siphon cover, 302. Anti-siphon core, 40. Water tank, 50. Inlet valve, 60. Filter, 70. Flushing valve. Detailed Implementation

[0041] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," etc., to indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings is solely for the convenience of describing the invention and does not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation on the scope of protection of this invention. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] Furthermore, in the description of this invention, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0043] Please see Figures 1-13 As shown, an inlet valve of the present invention includes an inlet valve body and a filter that does not require disassembly and cleaning. The housing of the filter is disposed on the inlet pipe of the inlet valve body, so that the filter filters the water entering the inlet pipe.

[0044] The filter housing 1 has an inlet 111, an outlet 121, and a drain 112 communicating with its internal cavity. The filter also includes a filter screen 2, which is installed inside the housing 1. The filter further includes a switching element 3, which is movably disposed inside the housing 1. The switching element 3 is used to switch the flow direction of water within the housing 1, so that the filter screen 2 is in either a filtering state or a rinsing state. In the filtering state, water flows from the raw water side of the filter screen 2 through the filter screen 2 to the clean water side of the filter screen 2 and flows out from the outlet 121. In the rinsing state, at least a portion of the water flows from the clean water side of the filter screen 2 through the filter screen 2 to the raw water side of the filter screen 2 and is discharged from the drain 112. The raw water side of the filter screen 2 refers to the space on one side of the filter screen 2, where the water is not filtered by the filter screen 2, but can pass through the mesh of the filter screen 2 during filtration. The clean water side of the filter screen 2 refers to the space on the other side of the filter screen 2, where the water has been filtered by the filter screen 2 into clean water. The switching component 3 is partially located outside the housing 1 and can be driven to achieve the switching function. The specific driving method can be directly driven by human power, such as rotation, pushing, pressing, etc., or it can be driven by a driving mechanism, which is powered by electricity, such as a motor drive mechanism.

[0045] The switching component 3 specifically includes a first water-passing structure and a second water-passing structure. In the filtration state, water entering the housing 1 flows through the first water-passing structure to the raw water side of the filter screen 2. In the rinsing state, water entering the housing 1 flows through the second water-passing structure to the clean water side of the filter screen 2. Specifically, the second water-passing structure is located on the raw water side of the filter screen 2, so that in the rinsing state, the water flowing to the second water-passing structure is first filtered by the filter screen 2 before flowing to the clean water side of the filter screen 2. This ensures that the water entering the clean water side of the filter screen 2 is always filtered water, not raw water, thereby preventing impurities from the raw water from being introduced into the clean water side of the filter screen 2, and thus ensuring the quality of the water output from the housing 1.

[0046] In a preferred embodiment, the filter further includes a scraper 4, which is movably disposed within the housing 1 and located on the raw water side of the filter screen 2. The scraper 4 removes impurities from the filter screen 2 by moving relative to it, thereby improving the cleaning effect of the filter screen 2. Specifically, the scraper 4 is driven by the water flow entering the housing 1 to move relative to the filter screen 2, but this is not limited to this. In other embodiments, the scraper 4 is partially located outside the housing 1 and can be driven. In this case, the scraper 4 can be driven directly by human power or by a drive mechanism.

[0047] The filter screen 2 is cylindrical; therefore, the space on one side of the filter screen 2 refers to the outer space of the filter screen 2, and the space on the other side refers to the inner space of the filter screen 2. The switching element 3 is fitted together with the filter screen 2, and the switching element 3 switches the flow direction of water within the housing 1 by rotation. The scraper element 4 is also fitted together with the filter screen 2, and the scraper element 4 scrapes away impurities from the filter screen 2 by rotation. Specifically, the switching element 3 is fitted over the filter screen 2, and the scraper element 4 is located inside the switching element 3 and fitted over the filter screen 2. Figure 4 As shown, the scraper 4 is provided with multiple scraper strips 41 spaced apart along its circumference, each scraper strip 41 extending along the axial direction of the filter screen 2. Thus, when the scraper 4 rotates, its scraper strips 41 can scrape the surface of the filter screen 2 on the raw water side, and the gaps between adjacent scraper strips 41 can allow water to pass through, so that the water on the raw water side can flow normally through the filter screen 2.

[0048] In a preferred embodiment, the filter further includes a water distribution element 5 disposed within the housing 1, such as... Figure 5 As shown, the water distribution component 5 has a circular outline. It is equipped with an inlet groove 51 connecting to the inlet 111 and multiple inclined channels 52. These inclined channels 52 are distributed circumferentially along the water distribution component 5 and connected to the inlet groove 51. An impeller 42 is located at one end of the scraper component 4 near the water distribution component 5. Water flows out from the inclined channels 52 and impacts the impeller 42, causing it to rotate. Therefore, in this embodiment, the scraper component 4 utilizes water flow to provide driving force, ensuring that it automatically performs scraping action each time water enters the filter, thereby further ensuring the cleaning effect of the filter screen 2 and the normal water output of the housing 1 (if the mesh of the filter screen 2 is blocked by impurities, the water output will be affected). The number of inclined channels 52 is specifically two, but not limited to this; the two inclined channels 52 are approximately centrally symmetrically arranged on the water distribution component 5. The impeller 42 of the scraper component 4 includes multiple spiral blades arranged in the same direction, such as... Figure 10As shown, the impeller 42 of the scraper 4 has multiple small holes 43 distributed circumferentially at its root. These holes are inclined water holes, which facilitate upward water flow and allow the water flow to generate a reverse thrust as it passes through the inclined water holes, thus driving the scraper 4 to rotate more smoothly. In other embodiments, water can also flow through the gap between the scraper 4 and the switching member 3.

[0049] The switching component 3, near the end of the water distribution component 5, is provided with a first water-passing structure and a second water-passing structure distributed circumferentially thereon. For example... Figure 2 As shown, the first water passage structure includes multiple water inlets 31, each water inlet 31 having a through-type structure in the axial direction of the switching member 3, and each water inlet 31 leading to the inner cavity of the switching member 3. In the filtration state, the water inlet 31 is connected to the inclined water channel 52 of the water distribution member 5, and water flows through the water inlet 31 to the raw water side of the filter screen 2. The second water passage structure includes multiple water channels 32, each water channel 32 being located on the end face of the switching member 3 near the water distribution member 5, and extending radially along the switching member 3. In the rinsing state, the water channel 32 is connected to the inclined water channel 52, and water flows through the water channel 32 to the clean water side of the filter screen 2. The number of water inlets 31 and water channels 32 is two each, but not limited to this. The water inlets 31 and water channels 32 are alternately distributed in the circumferential direction of the switching member 3, and the water inlet 31 is an arc-shaped elongated hole, the length of which is greater than the length of the inclined water channel 52. One end of the switching component 3 is located between the impeller 42 and the water distribution component 5, so that in the filtration state, after the water flows from the inclined channel 52 of the water distribution component 5 to the water outlet 31, it can not only flow to the raw water side of the filter screen 2, but also quickly impact the impeller 42, causing the impeller 42 to drive the entire scraper component 4 to rotate. When the filter of the present invention does not include the water distribution component 5, the water inlet 111 can be matched with the first water passage structure / second water passage structure, so that the water inlet 111 can directly cooperate with the first water passage structure / second water passage structure.

[0050] The portion of the switching element 3 located inside the housing 1 has four side walls. The drain port 112 of the housing 1 is located on the outer side of the four side walls of the switching element 3. Therefore, in the filtration state, the switching element 3 blocks the drain port 112 to prevent water from being discharged from the drain port 112. In the rinsing state, the switching element 3 opens the drain port 112, allowing water and impurities to be discharged from the drain port 112. Specifically, a through hole 34 is provided on the four side walls of the switching element 3. When the switching element 3 is rotated to the position corresponding to the rinsing state, the through hole 34 is exactly opposite to the drain port 112, thereby opening the drain port 112. To ensure sealing in the filtration state, the portion of the outer side of the switching element 3 used to block the drain port 112 is provided with a sealing element 36 that seals against the inner side of the housing 1. The sealing element 36 is approximately elliptical in shape, so that in the filtration state, water will not flow from the gap between the switching element 3 and the housing 1 to the drain port 112.

[0051] The portion of the switching element 3 located outside the housing 1 is an arc-shaped piece 33 extending circumferentially. This arc-shaped piece 33 constitutes a rotating operating part, and its outer surface is provided with an anti-slip structure. This anti-slip structure specifically includes multiple anti-slip ribs arranged circumferentially along the arc-shaped piece 33, but is not limited to this. Thus, by rotating the arc-shaped piece 33, the entire switching element 3 can be rotated, and the switching element 3 can be rotated in both directions, thereby realizing the switching function. To ensure sealing, a sealing ring 37 is fitted inside the housing 1 near the root of the arc-shaped piece 33. The housing 1 includes a main shell 11 and a cover 12 with a water outlet 121. One end of the main shell 11 has a water inlet 111, and the other end is open. The cover 12 is sealed to the other end of the main shell 11, and the arc-shaped piece 33 of the switching element 3 extends out from the space reserved between the cover 12 and the main shell 11 in a sealed manner.

[0052] The main body of the inlet valve includes a water-stop assembly 6, a lower guide tube 7, an upper sleeve 8, a lower sleeve 9, a siphon assembly 30, a float assembly 10, and an installation assembly 20. The water-stop assembly 6 consists of a valve body 61, an upper guide tube 62 mounted on the valve body 61, a water-stop gasket 63, and a water-stop cover 64. The upper guide tube 62 is sealed to the upper end of the lower guide tube 7, forming the inlet pipe of the main body of the inlet valve. The main shell 11 of the filter housing 1 is sealed to or integrally formed on the top of the lower guide tube 7, and the cover 12 is sealed to or integrally formed on the upper guide tube 62. The anti-siphon assembly 30 includes an anti-siphon upper cover 301 mounted on the valve body 61 and an anti-siphon core 302 that fits between the anti-siphon upper cover 301 and the large air inlet of the valve body 61. The lower sleeve 9 is fitted over the lower guide tube 7, and the upper sleeve 8 is fitted over the lower sleeve 9, and is sealed to the bottom end of the valve body 61. The three components cooperate to form the outlet pipe of the main body of the inlet valve. The float assembly 10 includes a float 101, an adjusting rod 102, and a lifting rod 103. The float 101 is fitted over the upper sleeve 8. The adjusting rod 102 passes through the float 101 in the vertical direction, and its upper end is movably connected to one end of the lifting rod 103. The other end of the lifting rod is movably connected to the waterstop cover 64 and is provided with an upper rubber gasket 104, which is used to open and close the pressure relief hole provided on the waterstop cover 64. The mounting assembly 20 includes a flange 201, a triangular washer 202, and a locking nut 203. The flange 201 and the triangular washer 202 are sequentially fitted over the bottom of the lower sleeve 9, and the locking nut 203 is threadedly connected to the outer side of the bottom of the lower sleeve 9.

[0053] When filter screen 2 is in the filtering state, when the inlet valve is opened, such as Figures 7-10As shown, at this time, water flows upward along the lower conduit 7 into the inlet 111 of the housing 1, and enters from the inlet 111 of the water distribution component 5. Then, it flows out along the inclined water channel 52 of the water distribution component 5 and flows into the switching component 3 through the water outlet 31 of the switching component 3. On the one hand, the water flow impacts the impeller 42 of the scraper component 4, causing the impeller 42 to drive the entire scraper component 4 to rotate and scrape impurities off the surface of the filter screen 2 on the raw water side. On the other hand, water flows from the raw water side of the filter screen 2 through the filter screen 2 to the clean water side of the filter screen 2, so that the raw water is effectively filtered of impurities by the filter screen 2 to form clean water, and flows out from the outlet 121, and finally outputs from the outlet end of the water outlet pipe of the main body of the inlet valve.

[0054] With the inlet valve closed, when cleaning the filter screen 2 is required, first rotate the arc-shaped plate 33 of the switching component 3 to rotate the switching component 3 to a preset angle until the drain port 112 is opened, and its water tank 32 is connected to the inclined water channel 52 of the water distribution component 5. At this time, as Figures 11-13 As shown, water entering the housing 1 flows from the inclined channel 52 to the water passage 32, and then along the water passage 32 to the filter screen 2. After being filtered by the filter screen 2, it enters the clean water side of the filter screen 2. Since the inlet valve is closed at this time, the water entering the clean water side of the filter screen 2 will not be discharged from the outlet 121, but will all flow through the filter screen 2 to the raw water side of the filter screen 2, thereby performing a reverse flushing of the filter screen 2, washing out the impurities attached to the filter screen 2, and discharging them with the water flow from the drain port 112. The drain port 112 can be connected to the overflow pipe of the drain valve, but is not limited to this. After the filter screen 2 finishes cleaning, the switching component 3 is rotated in the opposite direction to reset the switching component 3 to the state of closing the drain port 112 and connecting its water passage 31 to the inclined channel 52, preparing for the filtration action when the inlet valve is opened next time.

[0055] Therefore, when the filter screen 2 needs cleaning, it is not necessary to remove the filter screen 2. Furthermore, the filter screen 2 is cleaned by backwashing, which greatly improves the cleaning effect of the filter screen 2, effectively preventing impurities from clogging the mesh of the filter screen 2, and ensuring the service life of the filter screen 2 and the normal water output of the housing 1. At the same time, the present invention only needs to use the switching component 3 to switch the flow direction of water within the housing 1 to achieve both normal filtration and backwashing of the filter screen 2. Therefore, it is not necessary to reverse the flow of water into the housing 1, thus eliminating the need for power components and reversing components to reverse the water flow, making the overall structure simpler and the cost lower.

[0056] Please see Figure 14 As shown, a water tank device of the present invention includes a water tank 40, an inlet valve 50 for replenishing water to the water tank 40, and a filter 60. The filter 60 adopts a non-disassembly and cleaning filter provided by the present invention, and the filter 60 is installed upstream of the inlet valve 50 so that water flows to the inlet valve 50 after being filtered by the filter 60.

[0057] Please see Figure 15 As shown, a flushing device of the present invention is used for flushing toilets or squat toilets and other sanitary ware. It includes a flushing valve 70 and a filter 60. The filter 60 is a non-removable filter of the present invention, and is installed upstream of the flushing valve 70, so that water flows to the flushing valve 70 after being filtered by the filter 60. The flushing valve 70 is preferably a solenoid valve, but is not limited thereto.

[0058] The present invention provides a filter, inlet valve, water tank device, and flushing device that do not require disassembly and cleaning. The parts not covered (such as the working principle of the inlet valve) are the same as or can be implemented using existing technologies.

[0059] The above embodiments are only used to further illustrate a filter, inlet valve, water tank device and flushing device that does not require disassembly and cleaning according to the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A non-disassembly and washable filter, comprising a housing and a filter screen, wherein the housing has an inlet, an outlet, and a drain outlet communicating with its internal cavity, and the filter screen is installed inside the housing; characterized in that: It also includes a switching element, which is movably disposed within the housing. The switching element is used to switch the flow direction of water within the housing, so that the filter screen is in either a filtering state or a rinsing state. In the filtering state, water flows from the raw water side of the filter screen through the filter screen to the clean water side of the filter screen and flows out from the outlet. In the rinsing state, at least a portion of the water flows from the clean water side of the filter screen through the filter screen to the raw water side of the filter screen and is discharged from the drain outlet. The switching component switches the flow direction of water within the housing by rotation; the switching component is provided with a first water passage structure and a second water passage structure. In the filtration state, water entering the housing flows to the raw water side of the filter screen through the first water passage structure. In the rinsing state, water entering the housing flows to the clean water side of the filter screen through the second water passage structure. The first water passage structure includes a water inlet that leads to the inner cavity of the switching element. In the filtration state, water flows through the water inlet to the raw water side of the filter screen. The second water passage structure includes a water channel that extends radially along the switching element. In the rinsing state, water flows through the water channel to the clean water side of the filter screen.

2. The filter that does not require disassembly and cleaning according to claim 1, characterized in that: It also includes a scraper, which is movably disposed within the housing and located on the raw water side of the filter screen. The scraper removes impurities from the filter screen by moving relative to the filter screen.

3. The filter that does not require disassembly and cleaning according to claim 2, characterized in that: The filter screen is cylindrical, and the switching component is sleeved together with the filter screen; the scraper is sleeved together with the filter screen, and the scraper removes impurities from the filter screen by rotating.

4. The filter that does not require disassembly and cleaning according to claim 3, characterized in that: The switching component is fitted over the filter screen, and the scraping component is located inside the switching component and fitted over the filter screen; the scraping component is provided with a plurality of scraping strips distributed at intervals along its circumference, and each scraping strip extends along the axial direction of the filter screen.

5. The filter that does not require disassembly and cleaning according to claim 1, characterized in that: The second water passage structure is located on the raw water side of the filter screen, so that in the rinsing state, the water flowing to the second water passage structure is first filtered by the filter screen and then flows to the clean water side of the filter screen.

6. The non-disassembly and washable filter according to any one of claims 2-4, characterized in that: The scraper is driven by the water flow entering the housing to move relative to the filter screen; it also includes a water distribution component disposed in the housing, which has a water inlet groove connected to the water inlet and multiple inclined water channels. The multiple inclined water channels are distributed circumferentially along the water distribution component and connected to the water inlet groove. The scraper is provided with an impeller. After the water flows out from the inclined water channels, it impacts the impeller, causing the impeller to drive the scraper to rotate.

7. The filter that does not require disassembly and cleaning according to claim 6, characterized in that: One end of the switching component is provided with a first water passage structure and a second water passage structure distributed circumferentially thereon; there are multiple water passages; in the filtration state, the water passages are connected to the inclined water channel; there are multiple water passage troughs; in the flushing state, the water passage troughs are connected to the inclined water channel; one end of the switching component is located between the impeller and the water distribution component.

8. The non-disassembly and washable filter according to any one of claims 1-5, characterized in that: In the filtration state, the switching element blocks the drain outlet; in the flushing state, the switching element opens the drain outlet; and / or, the switching element is partially located outside the housing and can be driven; the portion of the switching element outside the housing is an arc-shaped piece extending circumferentially, and the outer surface of the arc-shaped piece is provided with an anti-slip structure.

9. A water inlet valve, comprising a water inlet valve body, characterized in that: It also includes a filter that does not require disassembly and cleaning as described in any one of claims 1-8, wherein the housing is disposed on the water inlet pipe of the water inlet valve body, so that the filter filters the water entering the water inlet pipe.

10. A water tank device, comprising a water tank and an inlet valve for replenishing water to the water tank, characterized in that: It also includes a non-removable filter as described in any one of claims 1-8, the filter being installed upstream of the inlet valve so that water flows to the inlet valve after being filtered by the filter.

11. A flushing device, comprising a flushing valve, characterized in that: It also includes a non-disassembly and washable filter as described in any one of claims 1-8, the filter being installed upstream of the flushing valve so that water flows to the flushing valve after being filtered by the filter.

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