A valve with backwash function and urinal

Abstract

The application discloses a valve with back-flushing function and a urinal, which comprises a valve body and a filter core, the valve body is provided with a water passing cavity, the filter core is arranged in the water passing cavity of the valve body and divides the water passing cavity of the valve body into a raw water cavity and a clean water cavity; the valve body is further provided with a water inlet channel, a back-flushing channel, a filtering channel and a sewage discharge channel, one end of the back-flushing channel is communicated with the water inlet channel, and the other end is communicated with the clean water cavity; the back-flushing assembly further comprises a control component connected to the valve body and a dirt scraping piece, the control component controls the sewage discharge channel and the filtering channel to switch and open, and drives the dirt scraping piece to scrape off the impurities throttled on the raw water side of the filter core during the opening of the sewage discharge channel; when the filtering channel is opened, the raw water cavity and the water inlet channel are communicated through the filtering channel; when the sewage discharge channel is opened, the sewage discharge channel is communicated with the raw water cavity. The application can flush and scrape the filter core, greatly improves the cleaning effect of the filter core, thereby reducing the frequency of replacing the filter core and the trouble of disassembling and assembling the filter core.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a valve and urinal with backwash function. Background Technology

[0002] Valves, such as solenoid valves, angle valves, and ball valves, are commonly used to control fluid flow and regulate flow rate, and their applications are very widespread. Traditional valves typically lack filtration capabilities, making them prone to poor sealing or even clogging when the water contains high levels of impurities, thus failing to meet practical usage requirements. To address this, many existing valves incorporate filter elements, filtering the water entering the valve before it exits. However, after prolonged use, the filter element in valves with valve cores can become clogged, affecting performance. Currently, some solutions address this by periodically replacing the filter element, but this method is costly and usually requires professional valve disassembly and installation, which is cumbersome. Others add backwashing functions to valves with valve cores, hoping to clean the filter element through backwashing; however, this method typically involves only simple reverse flushing, which is ineffective at cleaning the filter element. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing a valve and urinal with a backwashing function, which can scrape and wash the filter element, thereby greatly improving the service life of the filter element.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a valve with backwashing function, including a valve body and a filter element, the valve body is provided with a water passage cavity, the filter element is disposed in the water passage cavity of the valve body, and the water passage cavity of the valve body is divided into a raw water cavity and a clean water cavity;

[0005] The valve body is also equipped with an inlet channel, a backwash channel, a filter channel and a drain channel. One end of the backwash channel is connected to the inlet channel and the other end of the backwash channel is connected to the clean water chamber.

[0006] It also includes a backwashing assembly, which includes a control component connected to the valve body and a scraper on the control component. The control component controls the switching of the drain channel and the filter channel. During the opening of the drain channel, the scraper removes impurities throttled on the raw water side of the filter element. When the filter channel is open, the raw water chamber and the inlet channel are connected through the filter channel. When the drain channel is open, the drain channel is connected to the raw water chamber.

[0007] Furthermore, the valve body is also equipped with a backwash filter screen, which filters the water flowing through the backwash channel.

[0008] Furthermore, the backwash filter is installed in the water inlet channel and located at one end of the backwash channel, and the filter surface of the backwash filter is perpendicular to the direction in which water flows from the water inlet channel to the filter channel.

[0009] Furthermore, the water flow area of ​​the backwash channel is smaller than that of the filter channel and also smaller than that of the inlet channel.

[0010] Furthermore, the control component includes a control rod, which is provided with a scraper, a first sealing part for opening and closing the sewage discharge channel, and a second sealing part for opening and closing the filter channel. The control rod is axially movable and / or rotatably connected to the valve body, with one end of the control rod located inside the raw water chamber and the other end of the control rod connected to an operating handle located outside the valve body.

[0011] Furthermore, the filter element includes a cylindrical main filter screen located around the control rod, and a scraper located inside the main filter screen. The scraper rotates with the control rod but does not move with the control rod. The control rod drives the first and second sealing parts to move by axial movement or rotation.

[0012] Furthermore, the first sealing part is a plug located at one end of the control rod, so as to move axially with the control rod; an impurity accumulation chamber is provided between the raw water chamber and the sewage discharge channel, and the first sealing part penetrates through the impurity accumulation chamber; the control rod is hollow, and the second sealing part is a baffle plate located on the side wall of the control rod. The side wall of the control rod is also provided with a first water passage hole and a second water passage hole connecting its inner cavity and the raw water chamber. The first water passage hole and the baffle plate switch to cooperate with each other at the end of the filter channel and the raw water chamber as the control rod rotates.

[0013] Furthermore, the scraper is cylindrical, with multiple scraping rods and multiple perforated holes on its four sides. The scraping rods and perforated holes are alternately distributed along the circumference of the scraper, and the scraping rods extend along the axial direction of the scraper. The scraper is fitted onto the control rod, and a connecting structure is provided between the two.

[0014] Furthermore, the connection structure includes multiple connecting rods distributed circumferentially on the inner side of the scraper and connection notches corresponding to each connecting rod on the outer side of the control rod. The connecting rods extend along the axial direction of the scraper, and the connecting rods and connection notches slide in fit with each other.

[0015] Furthermore, the control lever is threadedly connected to the valve body.

[0016] Furthermore, the valve body is provided with a water outlet and also includes a first valve core, which is located in the valve body and controls whether the water outlet is connected to the clean water chamber; the first valve core includes one of a pulse valve core and a mechanical valve core.

[0017] Furthermore, it also includes a second valve core, which is disposed on the water inlet channel of the valve body. The second valve core includes a valve core body and a knob. The valve core body is installed in the water inlet channel, and the knob is rotatably connected to the valve body. One end of the knob enters the water inlet channel along the radial direction of the water inlet channel and is connected to the valve core body. The other end of the knob is located outside the valve body and is provided with an operating notch. The second valve core is a ball valve core.

[0018] The present invention also provides a urinal, including a urinal body and a valve with a backwash function as described above. The valve is installed on the flushing water circuit of the urinal body to control whether the urinal body flushes.

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

[0020] 1. This invention, by incorporating a backwashing component, not only reverse-washes the filter element but also uses a scraper to remove impurities throttled on the raw water side of the filter element. This allows for both rinsing and scraping of the filter element, significantly improving its cleaning efficiency. Consequently, it effectively extends the filter element's lifespan, reducing the frequency of replacement and minimizing the hassle of disassembling and assembling it.

[0021] 2. The valve body is also equipped with a backwash filter. This backwash filter filters the water flowing through the backwash channel, ensuring that the water flowing from the backwash channel to the clean water chamber is clean water. Therefore, even if the backwash channel is always open, the overall filtration effect will not be affected. In particular, the backwash filter is located in the inlet channel and at one end of the backwash channel, allowing water to flow from the inlet channel to the filtration channel and continuously flush the backwash filter, reducing the accumulation of impurities on the backwash filter.

[0022] 3. The control component includes a control rod, which is equipped with a scraper, a first sealing part for opening and closing the sewage discharge channel, and a second sealing part for opening and closing the filter channel. The control rod is axially movable and / or rotatably connected to the water passage cavity of the valve body, and one end of the control rod is connected to an operating handle or drive mechanism located outside the valve body, making the structure of the control component relatively simple and easy to operate.

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the valve and urinal with backwash function of the present invention are not limited to the embodiments. Attached Figure Description

[0024] Figure 1 This is an exploded view of the valve of the present invention;

[0025] Figure 2 This is an exploded view of the backwashing assembly of the present invention;

[0026] Figure 3This is a three-dimensional structural diagram of the valve of the present invention;

[0027] Figure 4 This is a cross-sectional view of the valve of the present invention in an exploded state;

[0028] Figure 5 This is a cross-sectional view of the valve of the present invention in its assembled state;

[0029] Figure 6 This is a top view of the valve of the present invention in the filtering state;

[0030] Figure 7 yes Figure 6 AA section view;

[0031] Figure 8 This is a top view of the valve of the present invention in the backflushing state;

[0032] Figure 9 yes Figure 8 BB cross-sectional view;

[0033] Figure 10 This is a cross-sectional view of the present invention in the second valve core closed state (partially not shown);

[0034] Figure 11 This is a three-dimensional structural diagram of the urinal of the present invention;

[0035] Figure 12 This is a front view of the urinal of the present invention;

[0036] In the diagram: 1. Pulse valve core; 2. Operating handle; 3. Valve cover; 4. Main filter screen; 5. Scraper; 51. Scraper bar; 52. Hole; 53. Connecting rod; 6. Control rod; 61. Connecting notch; 62. First water passage hole; 63. Second water passage hole; 64. Baffle plate; 7. Plug; 8. Valve body; 81. Water passage chamber; 82. Water inlet channel; 83. Water outlet; 84. Filter channel; 85. Backwash channel; 86. Sewage discharge channel; 87. Impurity accumulation bin; 9. Backwash filter screen; 10. Ball valve core; 101. Valve core body; 102. Knob; 103. Screw; 104. Operating notch; 20. Urinal body. Detailed Implementation

[0037] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. 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. In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Please see Figures 1-9 As shown, a valve with backwashing function according to the present invention includes a valve body, a filter element, and a first valve core. The valve body has a water passage chamber 81 and a water outlet 83. The filter element is disposed in the water passage chamber 81 of the valve body, dividing the water passage chamber 81 of the valve body into a raw water chamber and a clean water chamber. The valve body also has an inlet channel 82, a backwashing channel 85, a filtration channel 84, and a drain channel 86. One end of the backwashing channel 85 is connected to the inlet channel 82, and the other end of the backwashing channel 85 is connected to the clean water chamber. The first valve core is disposed in the valve body and controls whether the water outlet 83 is connected to the clean water chamber. In this embodiment, the first valve core is a pulse valve core 1. Therefore, the valve of the present invention is a pilot-operated pulse solenoid valve, but it is not limited to this. In other embodiments, the first valve core is a mechanical valve core, making the valve of the present invention a mechanical valve.

[0039] The present invention also includes a backwashing assembly, which includes a control component connected to the valve body and a scraper 5 disposed on the control component. The control component controls the switching of the opening of the drain channel 86 and the filter channel 84, and during the opening of the drain channel 86, the scraper 5 scrapes away impurities throttled on the raw water side of the filter element. When the filter channel 84 is open, the raw water chamber and the inlet channel 82 are connected through the filter channel 84; when the drain channel 86 is open, the drain channel 86 is connected to the raw water chamber. Therefore, the present invention can flush and scrape the filter element, thereby greatly improving the cleaning effect of the main filter screen.

[0040] As a preferred embodiment, the valve body also includes a backwash filter 9, which filters the water flowing through the backwash channel 85. Thus, even if the backwash channel 85 is always open, the overall filtration effect is not affected. Specifically, the backwash filter 9 is located in the inlet channel 82 and at one end of the backwash channel 85, and the filter surface of the backwash filter 9 is perpendicular to the direction of water flow from the inlet channel 82 to the filter channel 84. Therefore, as water flows from the inlet channel 82 to the filter channel 84, it can flush the backwash filter 9 in real time, thereby reducing the accumulation of impurities on the backwash filter 9. This eliminates the need for a separate backwashing mechanism for cleaning the backwash filter 9. In particular, the water flow area of ​​the backwash channel 85 is much smaller than that of the filter channel 84 and also much smaller than that of the inlet channel 82. Therefore, when both the backwash channel 85 and the filter channel 84 are open, most of the water flows to the filter channel 84, and only a small portion flows to the backwash channel 85. This results in a very small filtration capacity of the backwash filter screen 9 under normal filtration conditions, making it less likely for the backwash filter screen 9 to be clogged by impurities.

[0041] In this embodiment, the control component includes a control lever 6, which has a scraper 5, a first sealing part for switching the drain channel 86 on and off, and a second sealing part for switching the filter channel 84 on and off. The control lever 6 is axially movable and / or rotatably connected to the valve body, with one end of the control lever 6 located inside the raw water chamber and the other end extending out of the valve body and connected to an operating handle 2 located outside the valve body. Specifically, this invention is described using the example of the control lever 6 being axially movable and rotatably connected to the valve body, but the connection method between the control lever 6 and the valve body is not limited to this. As a preferred embodiment, the control lever 6 is threadedly connected to the valve body. In other embodiments, the other end of the control lever 6 is connected to a drive mechanism, which can be an electronically controlled mechanism, such as an electronically controlled mechanism powered by a motor.

[0042] In this embodiment, the filter element includes a cylindrical main filter screen 4, located around the control rod 6. A scraper 5 is located inside the main filter screen 4, rotating with the control rod 6 but not moving with it. This allows the scraper 5 to scrape the main filter screen 4 when the control rod 6 rotates, but not when the control rod 6 moves axially, thus maintaining its position inside the main filter screen 4. The control rod 6 moves axially or rotates to activate the first and second sealing parts. Specifically, in this embodiment, the control rod 6 moves axially to open / close the drain channel 86 of the first sealing part and the filter channel 84 of the second sealing part. The main filter screen 4 and the backwash filter screen 9 use filter screens with a mesh size of 80 or larger, whose flow holes are much smaller than the pressure relief hole of the pulse valve core 1, effectively preventing impurities from blocking the pressure relief hole and reducing the risk of abnormal switching of the pulse valve core 1.

[0043] In this embodiment, the first sealing part is a plug 7 located at one end of the control rod 6. An impurity accumulation chamber 87 is provided between the raw water chamber and the sewage discharge channel 86 of the valve body to reduce impurity blockage of the sewage discharge channel 86. The first sealing part (i.e., the plug 7) penetrates the impurity accumulation chamber 87, allowing the plug 7 to lift and loosen the impurities accumulated in the impurity accumulation chamber 87 when the control rod 6 moves axially, thus facilitating impurity discharge. The control rod 6 is hollow, and the second sealing part is a baffle plate 64 located on the side wall of the control rod 6. The side wall of the control rod 6 also has a first water passage hole 62 and a second water passage hole 63 connecting its inner cavity. The first water passage hole 62 and the baffle plate 64 are distributed circumferentially along the control rod 6 and switch their engagement with the end of the filter channel 84 that engages with the raw water chamber as the control rod 6 rotates. Specifically, the first water passage hole 62 and the baffle plate 64 are arranged opposite each other, and the control rod 6 rotates 180° each time.

[0044] like Figure 1 , Figure 2 As shown, the scraper 5 of the present invention is cylindrical, with multiple scraping rods 51 and multiple perforated holes 52 on its surrounding sidewalls. The scraping rods 51 and perforated holes 52 are alternately distributed along the circumference of the scraper 5, and the scraping rods 51 extend along the axial direction of the scraper 5. The scraper 5 is fitted onto the control rod 6, and a connecting structure is provided between the two to allow the scraper 5 to rotate with the control rod 6 but not to move with the control rod 6. The connecting structure specifically includes multiple connecting rods 53 distributed along the circumference of the inner side of the scraper 5 and connecting notches 61 corresponding to each connecting rod 53 on the outer side of the control rod 6. The connecting rods 53 extend along the axial direction of the scraper 5, and the connecting rods 53 and the connecting notches 61 are slidably engaged one-to-one. In this embodiment, the connecting rods 53 correspond one-to-one with the scraping rods 51, and the connecting rods 53 are integrally formed on the inner side of the scraping rods 51, but this is not limited to this.

[0045] The present invention also includes a second valve core disposed on the water inlet channel 82 of the valve body, which can be used to adjust the flow rate of the water inlet channel 82 or to close the water inlet channel 82 to facilitate maintenance of the first valve core or the main filter screen 4, etc. The second valve core is preferably a ball valve core 10, but is not limited thereto. The ball valve core 10 includes a valve core body 101 and a knob 102. The valve core body 101 is installed in the water inlet channel 82. The knob 102 is rotatably connected to the valve body and is limited by a screw 103 to prevent the knob 102 from detaching from the valve body. One end of the knob 102 enters the water inlet channel 82 and is connected to the valve core body 101. The other end of the knob 102 protrudes from the valve body and is provided with an operating notch 104. The operating notch 104 is in the shape of a straight line, but is not limited thereto. In other embodiments, the operating notch 104 is in the shape of a cross, etc. Thus, when it is necessary to operate knob 102, the user can insert a screw or other tool into the operating notch 104 to rotate knob 102, thereby opening and closing the ball valve core 10 or regulating the flow rate. Figure 7 , Figure 9 , Figure 10 As shown, Figure 7 , Figure 9 This indicates the open state of the ball valve core 10. Figure 10 This indicates the closed state of the ball valve core 10.

[0046] In this embodiment, the valve body includes a valve housing 8 and a valve cover 3. The valve housing 8 is provided with a water passage chamber 81, an inlet channel 82, a filter channel 84, a backwash channel 85, and an outlet 83, and is equipped with the first valve core and the second valve core. The water passage chamber 81 of the valve housing 8 has an opening, and the valve cover 3 is sealed to the opening. Specifically, the valve cover 3 is threaded to the end of the valve housing 8 with the opening, and a sealing ring is provided between the two. The control rod 6 is threaded to the valve cover 3, and a sealing ring is provided between the two. One end of the main filter screen 4 and one end of the scraper 5 are fitted into the first annular limiting groove provided in the valve cover 3, and the other end of the backwash filter screen 9 and the other end of the scraper 5 are fitted into the corresponding second annular limiting groove provided in the valve housing 8. Therefore, during assembly, the backwash assembly, the main filter screen 4, and the valve cover 3 are first combined together, and then installed on the valve housing 8, as follows. Figure 4 , Figure 5 As shown. This makes the installation and removal of the backwashing assembly more convenient, thus facilitating later maintenance. The operating handle 2 is fitted onto the outside of the valve cover 3, and the valve cover 3 is provided with a rotation indicator to indicate the current state of the operating handle 2.

[0047] This invention provides a valve with a backwashing function, which has a filtration state and a backwashing state. When the invention is in the filtration state, the plug 7 blocks the drain channel 86, and the first water passage 62 on the control rod 6 is aligned with the end of the filter channel 84 facing the raw water chamber. With the first valve core (i.e., pulse valve core 1) and the second valve core (i.e., ball valve core 10) open, water sequentially enters the control rod 6 along the inlet channel 82, the filter channel 84, and the first water passage 62, and flows into the raw water chamber through the second water passage 63 of the control rod 6. After being filtered by the main filter screen 4, it flows into the clean water chamber, then through the pulse valve core 1 to the outlet 83, and finally outputs from the outlet 83. Figure 7 As shown in the diagram, the arrows indicate the direction of water flow. During this process, a small portion of the water flows through the backwash filter 9 and then into the clean water chamber via the backwash channel 85. The water flowing from the inlet channel 82 to the filter channel 84 washes the raw water side surface of the backwash filter 9, effectively providing a reverse flushing effect and preventing dirt buildup. Furthermore, the smaller water flow from the backwash filter 9 to the backwash channel 85 results in a smaller filtration volume for the backwash filter 9 during filtration, further reducing the likelihood of dirt accumulation.

[0048] When backwashing the main filter screen 4 is required, turn the operating handle 2 counterclockwise (the handle 2 rotates 180° each time), causing the control lever 6 to move upward axially a certain distance, opening the drain channel 86 with the plug 7. Simultaneously, the control lever 6 rotates 180° counterclockwise, causing the baffle plate 64 near it to rotate to the end of the filter channel 84 facing the raw water chamber, thus closing the filter channel 84. During the rotation of the control lever 6, the scraper 5 rotates along with it, causing each scraper bar 51 to scrape away impurities trapped on the raw water side of the main filter screen 4. With the second valve core (i.e., ball valve core 10) open, water in the inlet channel 82 flows into the filter channel 84 after being filtered by the backwash filter screen 9, and then flows into the clean water chamber through the filter channel 84, rinsing the main filter screen 4. The water then flows sequentially from the second water passage 63 and the first water passage 62 of the control lever 6 to the drain channel 86, finally being discharged along with impurities from the drain channel 86. Figure 9 As shown. The design of the second water passage 63 of the control lever 6 results in an asymmetrical water flow above the impurity accumulation chamber 87, thereby reducing the water flow area, increasing the flushing force, and achieving powerful flushing of impurities. During the opening of the sewage discharge channel 86, the control lever 6 and the plug 7 lift and loosen the impurities accumulated in the impurity accumulation chamber 87. Combined with the flushing action of the flushing water, this allows the impurities to be smoothly discharged from the sewage discharge channel 86, thus preventing impurities from clogging the sewage discharge channel 86.

[0049] After rinsing the filter element, turn the operating handle 2 clockwise to rotate the control lever 6 180° in the opposite direction, and drive the plug 7 back to the closed state of the drain channel 86. At the same time, the baffle 64 on the control lever 6 moves away from the other end of the filter channel 84, so that the filter channel 84 returns to the open state, preparing for the subsequent normal filtration operation.

[0050] Therefore, the valve with backwashing function of the present invention can flush and scrape the filter element, which greatly improves the cleaning effect of the filter element, can effectively extend the service life of the filter element, thereby reducing the frequency of filter element replacement and reducing the trouble of disassembling and assembling the filter element.

[0051] Please see Figures 1-11 As shown, a urinal of the present invention includes a urinal body 20 and a valve with a backwash function as described above. This valve is installed on the flushing water path of the urinal body 20 to control whether the urinal body 20 flushes. Specifically, the valve is installed on the top of the back side of the urinal, but is not limited thereto. Since the valve of the present invention is a solenoid valve, the present invention enables the urinal to achieve automatic flushing by incorporating a sensor, such as an infrared sensor, in conjunction with the solenoid valve and its main control board.

[0052] The present invention relates to a valve and urinal with a backwashing function. The parts not described herein are the same as or can be implemented using existing technology.

[0053] The above embodiments are only used to further illustrate a valve and urinal with backwashing function according to the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations 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 valve with backwashing function, comprising a valve body and a filter element, wherein the valve body has a water passage chamber, the filter element is disposed within the water passage chamber of the valve body, and the water passage chamber of the valve body is divided into a raw water chamber and a clean water chamber; characterized in that: The valve body is also provided with a water inlet channel, a backwash channel, a filter channel and a sewage discharge channel. One end of the backwash channel is connected to the water inlet channel and the other end of the backwash channel is connected to the water purification chamber. It also includes a backwashing assembly, which includes a control component connected to the valve body and a scraper disposed on the control component. The control component controls the opening and closing of the drain channel and the filter channel, and during the opening of the drain channel, it drives the scraper to scrape off impurities throttled on the raw water side of the filter element. When the filter channel is open, the raw water chamber and the inlet channel are connected through the filter channel. When the drain channel is open, the drain channel is connected to the raw water chamber. The control component includes a control lever, which is provided with the scraper, a first sealing part for opening and closing the sewage channel, and a second sealing part for opening and closing the filter channel. The control lever is axially movable and / or rotatably connected to the valve body.

2. The valve with backflushing function according to claim 1, characterized in that: The valve body is also equipped with a backwash filter screen, which filters the water flowing through the backwash channel.

3. The valve with backflushing function according to claim 2, characterized in that: The backwash filter is disposed in the water inlet channel and located at one end of the backwash channel, and the filter surface of the backwash filter is perpendicular to the direction in which water flows from the water inlet channel to the filter channel.

4. The valve with backflushing function according to claim 1, characterized in that: The water flow area of ​​the backwash channel is smaller than that of the filter channel and also smaller than that of the inlet channel.

5. The valve with backflushing function according to claim 1, characterized in that: One end of the control rod is located inside the raw water chamber, and the other end of the control rod is connected to an operating handle located outside the valve body.

6. The valve with backflushing function according to claim 5, characterized in that: The filter element includes a cylindrical main filter screen located around the control rod, and a scraper located inside the main filter screen. The scraper rotates with the control rod but does not move with the control rod. The control rod moves axially or rotates to activate the first and second sealing parts.

7. The valve with backflushing function according to claim 6, characterized in that: The first sealing part is a plug and is located at one end of the control rod, so as to move axially with the control rod; an impurity accumulation chamber is provided between the raw water chamber and the sewage discharge channel, and the first sealing part penetrates the impurity accumulation chamber; the control rod is hollow, and the second sealing part is a baffle plate provided on the side wall of the control rod. The side wall of the control rod is also provided with a first water passage hole and a second water passage hole that connect its inner cavity and the raw water chamber. The first water passage hole and the baffle plate switch to cooperate with each other at the end of the filter channel that cooperates with the raw water chamber as the control rod rotates.

8. The valve with backflushing function according to claim 6, characterized in that: The scraper is cylindrical, with multiple scraping rods and multiple perforated holes on its four sides. The scraping rods and perforated holes are alternately distributed along the circumference of the scraper, and the scraping rods extend along the axial direction of the scraper. The scraper is fitted onto the control rod, and a connecting structure is provided between the two.

9. The valve with backflushing function according to claim 8, characterized in that: The connection structure includes multiple connecting rods distributed circumferentially on the inner side of the scraper and connection notches corresponding to each connecting rod on the outer side of the control rod. The connecting rods extend along the axial direction of the scraper, and the connecting rods and connection notches slide in fit with each other.

10. The valve with backflushing function according to claim 5, characterized in that: The control rod is threadedly connected to the valve body.

11. The valve with backflushing function according to claim 1, characterized in that: The valve body is provided with a water outlet and also includes a first valve core, which is disposed in the valve body and controls whether the water outlet is connected to the clean water chamber; the first valve core includes one of a pulse valve core and a mechanical valve core.

12. The valve with backflushing function according to claim 1, characterized in that: It also includes a second valve core, which is disposed on the water inlet channel of the valve body. The second valve core includes a valve core body and a knob. The valve core body is installed in the water inlet channel, and the knob is rotatably connected to the valve body. One end of the knob enters the water inlet channel along the radial direction of the water inlet channel and is connected to the valve core body. The other end of the knob is located outside the valve body and is provided with an operating notch. The second valve core is a ball valve core.

13. A urinal, comprising a urinal body, characterized in that: It also includes a valve with a backwash function as described in any one of claims 1-12, the valve being installed on the flushing water path of the urinal body to control whether the urinal body flushes.

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