A mechanical filter for waste water treatment facilitating cleaning

Abstract

The present application relates to the field of wastewater treatment, and more particularly to a mechanical filter for wastewater treatment convenient to clean, comprising a pipe body, water inlets and outlets are respectively arranged at both ends of the pipe body, an end cover is fixedly arranged at the upper end of the pipe body, a driving motor is fixedly installed on the end cover, a filter tank body is assembled and connected to the bottom of the pipe body, a bottom valve is assembled and connected to the bottom of the filter tank body, a filter screen sleeve is arranged inside the filter tank body, the top end of the filter screen sleeve is fixedly connected with the pipe body, a core shaft assembly is coaxially arranged inside the filter screen sleeve, the output end of the driving motor is connected with the core shaft assembly, a sweeping and scraping assembly is arranged inside the bottom valve, a clutch sleeve is arranged at the bottom of the core shaft assembly, a bottom plate is fixedly arranged in the bottom valve, a fixed screw sleeve is arranged in the center of the bottom plate, and a control bolt is screwedly installed in the fixed screw sleeve in a threaded manner. The filter clean water outlet and the cleaning wastewater outlet can be independently separated, so that pollution interference caused by the same drainage outlet during the drainage process is avoided.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a mechanical filter for wastewater treatment that is easy to clean. Background Technology

[0002] Mechanical filters, also known as pressure filters, are an important component of pretreatment and water purification systems in pure water production. They are made of steel lined with rubber or stainless steel, and are classified according to the filter media, such as natural quartz sand filters, multi-media filters, activated carbon filters, and manganese sand filters. They can also be classified according to the inlet water method, such as single-flow filters and dual-flow filters. They can be used in combination or individually, depending on the specific requirements.

[0003] Chinese Patent Publication No. CN216726053U discloses a filtration device for wastewater treatment, including a filter tank. A shaft connector is mounted on the top of the top cover, and a drive motor is mounted on the top of the shaft connector. An inlet and an outlet are located on one side of the filter tank's outer perimeter, and a gearbox is located on the other side of the filter tank's outer perimeter. A drive motor is mounted on the top of the gearbox. A baffle is installed between a primary filtration chamber and a secondary filtration chamber. A coarse filter screen is fitted inside the primary filtration chamber, and a fine filter screen is fitted inside the secondary filtration chamber. A scraper bucket is fitted around the outer perimeter of the coarse filter screen, and a scraper rod is installed inside the fine filter screen. During use, the filter tank has only one outlet on one side. When the filter tank is being scraped and rinsed, dirt and impurities in the rinsing wastewater easily remain at the outlet. During normal filtration, these residual dirt easily mixes with the filtered clean water, severely affecting the quality of the effluent in subsequent filtrations. Summary of the Invention

[0004] The purpose of this invention is to provide a mechanical filter for wastewater treatment that is easy to clean, thereby solving the aforementioned technical problems.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A mechanical filter for wastewater treatment and easy cleaning includes a pipe body with an inlet and an outlet connected to both ends. An end cap is fixedly mounted on the upper end of the pipe body, and a drive motor is fixedly installed on the end cap. A filter tank is assembled and connected to the bottom of the pipe body, and a bottom valve is assembled and connected to the bottom of the filter tank. A filter screen is installed inside the filter tank, and the top of the filter screen is fixedly connected to the pipe body. A spindle assembly is coaxially arranged inside the filter screen, and the output end of the drive motor is connected to the spindle assembly. A scraping assembly is installed inside the bottom valve, and a clutch sleeve is installed at the bottom of the spindle assembly. A base plate is fixedly installed inside the bottom valve, and a fixing screw sleeve is located in the center of the base plate. A control bolt is rotatably installed on the internal thread of the fixing screw sleeve, and the top of the control bolt rotatably engages with the bottom of the clutch sleeve. The control bolt switches between filtration and cleaning actions through the clutch sleeve. A valve plate for controlling the discharge of flushing wastewater is rotatably installed on the outside of the clutch sleeve.

[0007] As a further embodiment of the present invention: the spindle assembly includes a drive shaft coaxially arranged with the filter screen sleeve, the output end of the drive motor is connected to the drive shaft, an outer bushing is sleeved on the outside of the drive shaft, an absorption filter element is uniformly arranged circumferentially on the outer wall of the outer bushing, the outer bushing is rotatably engaged with the bottom of the filter screen sleeve, a drive gear is sleeved on the bottom of the drive shaft, and a rotating gear is sleeved on the bottom of the outer bushing.

[0008] As a further aspect of the present invention: an annular protrusion is provided on the outer wall of the drive shaft, and an annular groove is provided on the inner wall of the outer bushing, wherein the annular protrusion is adapted to be rotatably installed in the annular groove.

[0009] As a further embodiment of the present invention: the scraping assembly includes a turntable, the turntable being rotatably engaged with a bottom valve, a scraper blade being evenly arranged circumferentially on the upper end of the turntable, the two sides of the scraper blade being respectively in contact with the inner wall of the filter tank and the outer wall of the filter screen sleeve, a sealing rotating seat being provided at the upper end of the scraper blade, the bottom end of the filter screen sleeve being rotatably engaged with the sealing rotating seat, an extension sleeve being provided in the center of the turntable, a scraping tooth groove being provided on the inner wall of the extension sleeve, and a water outlet hole being provided through the turntable.

[0010] As a further embodiment of the present invention: the clutch sleeve is coaxially disposed inside the extension sleeve, the inner wall of the clutch sleeve is provided with a drive tooth groove and a rotating tooth groove, the outer wall of the clutch sleeve is provided with a scraping gear, the drive gear is always meshed with the drive tooth groove, the rotating gear corresponds to the rotating tooth groove, and the scraping gear corresponds to the scraping tooth groove.

[0011] As a further aspect of the present invention, the distance between the rotating gear and the scraping tooth groove is greater than the distance between the rotating tooth groove and the scraping gear.

[0012] As a further embodiment of the present invention: the valve plate is attached to the bottom of the base plate, the base plate is provided with a first drain hole, and the valve plate is provided with a second drain hole, the first drain hole and the second drain hole are arranged in the same way.

[0013] As a further aspect of the present invention: the water inlet is connected to the filter tank, a water suction hole is provided through the pipe, and the water outlet is connected to the interior of the filter tank through the water suction hole.

[0014] The beneficial effects of this invention are:

[0015] (1) By setting up a pipe body, filter tank, filter screen sleeve and bottom valve, the filter screen sleeve can divide the filter tank into two chambers, an inner and an outer chamber. The inlet is connected to the outer chamber and the outlet is connected to the inner chamber. At the same time, the bottom of the filter tank is connected to the bottom valve. When the wastewater is filtered, the filtered clean water will be drawn out through the outlet. When the tank is rinsed and cleaned, the rinsed wastewater will be discharged from the bottom valve. This allows the filtered clean water and the rinsed wastewater to be discharged from different outlets, avoiding pollution interference caused by the same outlet during the drainage process.

[0016] (2) By setting a clutch sleeve, when rotation filtration is required, the control bolt is rotated to push the clutch sleeve upward until the rotating tooth groove meshes with the rotating gear. At this time, the scraping gear disengages from the scraping tooth groove, and the drive shaft will drive the outer shaft sleeve to rotate synchronously through the clutch sleeve, so as to drive the absorption filter element to adsorb and filter the water. When rinsing and cleaning are required, the control bolt is rotated in the opposite direction to pull the clutch sleeve downward until the scraping gear meshes with the scraping tooth groove. At this time, the rotating tooth groove disengages from the rotating gear, and the drive shaft will drive the turntable to rotate synchronously through the clutch sleeve, so as to drive the scraper plate to perform scraping and cleaning. Thus, the different clutch states of the clutch sleeve can be used to realize the flexible switching between filtration and cleaning actions.

[0017] (3) By setting up a scraping component, when the filter is internally flushed and cleaned, the drive shaft will drive the turntable to rotate inside the bottom valve. The turntable will drive the scraper to rotate and scrape the filter residue on the inner wall of the filter tank and the outer wall of the filter screen, ensuring the efficiency of the scraping and cleaning. At the same time, it is used in conjunction with clean water for rinsing. The rinsing wastewater will be discharged directly from the outlet through the bottom of the bottom valve. When the residual impurities are large, the bottom valve can also be disassembled to clean the impurities directly from the filter tank. The rinsing and cleaning process is simple and efficient, which is conducive to improving the quality of wastewater filtration. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is an exploded view of the structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the internal structure of the present invention.

[0022] Figure 4 yes Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0023] Figure 5 This is a schematic diagram of the mandrel assembly in this invention.

[0024] Figure 6 yes Figure 5 Enlarged schematic diagram of the structure at point B.

[0025] Figure 7 This is a schematic diagram of the sweeping component in this invention.

[0026] Figure 8 This is a schematic diagram of the clutch sleeve in this invention.

[0027] In the diagram: 1. Pipe body; 101. Inlet; 102. Outlet; 103. Pumping hole; 2. End cap; 201. Drive motor; 3. Filter tank; 4. Bottom valve; 401. Bottom plate; 402. First drain hole; 5. Spindle assembly; 501. Drive shaft; 5011. Annular protrusion; 502. Outer bushing; 5021. Annular groove; 503. Absorption filter element; 504. Drive gear; 505. Rotary gear; 6. Filter screen sleeve; 7. Sweeping assembly; 701. Turntable; 702. Scraper; 703. Sealing rotating seat; 704. Extension sleeve; 705. Sweeping tooth groove; 706. Outlet; 8. Clutch sleeve; 801. Drive tooth groove; 802. Rotary tooth groove; 803. Sweeping gear; 9. Valve plate; 901. Second drain hole; 10. Control bolt; 11. Fixing screw sleeve. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-4As shown, this invention is a mechanical filter for wastewater treatment that is easy to clean. It includes a pipe body 1 with an inlet 101 and an outlet 102 connected to both ends. An end cap 2 is fixedly mounted on the upper end of the pipe body 1, and a drive motor 201 is fixedly installed on the end cap 2. A filter tank 3 is assembled and connected to the bottom of the pipe body 1, and a bottom valve 4 is assembled and connected to the bottom of the filter tank 3. A filter screen sleeve 6 is installed inside the filter tank 3, with its top end fixedly connected to the pipe body 1. A spindle assembly 5 is coaxially arranged inside the filter screen sleeve 6. The drive motor... The output end of 201 is connected to the spindle assembly 5. The bottom valve 4 is equipped with a scraping assembly 7. The bottom of the spindle assembly 5 is equipped with a clutch sleeve 8. The bottom valve 4 is fixedly equipped with a base plate 401. The center of the base plate 401 is equipped with a fixing screw sleeve 11. The fixing screw sleeve 11 is rotatably installed with a control bolt 10. The top of the control bolt 10 is rotatably engaged with the bottom of the clutch sleeve 8. The control bolt 10 realizes the clutch switching between the filtering action and the cleaning action through the clutch sleeve 8. The outer side of the clutch sleeve 8 is rotatably equipped with a valve plate 9 for controlling the discharge of flushing wastewater.

[0030] Specifically, by setting up a pipe body 1, a filter tank 3, a filter screen sleeve 6, and a bottom valve 4, the filter screen sleeve 6 can divide the filter tank 3 into inner and outer chambers. The inlet 101 is connected to the outer chamber, and the outlet 102 is connected to the inner chamber. At the same time, the bottom of the filter tank 3 is connected to the bottom valve 4. During wastewater filtration, wastewater enters the filter tank 3 through the inlet 101. The control bolt 10 controls the clutch sleeve 8 to engage with the spindle assembly 5. At this time, the drive motor 201 will drive the spindle assembly 5 to rotate, and the wastewater passes through the filter screen sleeve 6. After initial filtration, the water enters the filter screen sleeve 6 for secondary filtration. The filtered clean water is then drawn out through the outlet 102. During the tank rinsing and cleaning, the clutch sleeve 8 is controlled by the control bolt 10 to engage with the scraping assembly 7. At this time, the drive motor 201 will drive the scraping assembly 7 to scrape and clean the filter screen sleeve 6 and the filter tank 3. Meanwhile, the wastewater after rinsing will be discharged from the bottom valve 4, thus separating the filtered clean water outlet and the cleaning wastewater outlet to avoid pollution interference caused by the same drain outlet during the drainage process.

[0031] like Figure 5 As shown, the spindle assembly 5 includes a drive shaft 501 coaxially arranged with the filter screen sleeve 6. The output end of the drive motor 201 is connected to the drive shaft 501. An outer shaft sleeve 502 is sleeved on the outside of the drive shaft 501. Absorption filter elements 503 are evenly arranged circumferentially on the outer wall of the outer shaft sleeve 502. The outer shaft sleeve 502 is rotatably engaged with the bottom of the filter screen sleeve 6. A drive gear 504 is sleeved on the bottom of the drive shaft 501, and a rotating gear 505 is sleeved on the bottom of the outer shaft sleeve 502.

[0032] like Figure 6As shown, an annular protrusion 5011 is provided on the outer wall of the drive shaft 501, and an annular groove 5021 is provided on the inner wall of the outer bushing 502. The annular protrusion 5011 is adapted to be rotatably installed in the annular groove 5021.

[0033] Specifically, by setting the spindle assembly 5, due to the rotational engagement of the annular protrusion 5011 and the annular groove 5021, the outer bushing 502 is subject to axial movement constraint relative to the drive shaft 501. That is, the outer bushing 502 can only rotate around the axis of the drive shaft 501. When the clutch sleeve 8 engages with the spindle assembly 5, the drive shaft 501 will drive the outer bushing 502 to rotate synchronously, so that the absorption filter element 503 rotates continuously within the filter screen sleeve 6 and continuously absorbs suspended particles in the filtered water, thereby achieving a further filtration process for the water and ensuring the filtration effect of the wastewater.

[0034] like Figure 7 As shown, the scraping assembly 7 includes a turntable 701, which is rotatably engaged with the bottom valve 4. Scraper blades 702 are evenly arranged circumferentially on the upper end of the turntable 701. The two sides of the scraper blades 702 are respectively attached to the inner wall of the filter tank 3 and the outer wall of the filter screen sleeve 6. A sealing rotating seat 703 is provided on the upper end of the scraper blades 702. The bottom end of the filter screen sleeve 6 is rotatably engaged with the sealing rotating seat 703. An extension sleeve 704 is provided in the center of the turntable 701. Scraping tooth grooves 705 are provided on the inner wall of the extension sleeve 704. A water outlet hole 706 is provided through the turntable 701.

[0035] Specifically, by setting up the scraping assembly 7, when the filter is internally rinsed and cleaned, the rinsing water source enters from the inlet 101. At the same time, the clutch sleeve 8 cooperates with the scraping assembly 7. At this time, the drive shaft 501 will drive the turntable 701 to rotate inside the bottom valve 4. The turntable 701 will drive the scraper 702 to rotate and scrape the filter residue dirt on the inner wall of the filter tank 3 and the outer wall of the filter screen sleeve 6. The rinsing wastewater will be discharged directly from the outlet 706 through the bottom of the bottom valve 4. When the residual impurities are large, the bottom valve 4 can also be disassembled to clean the impurities directly from the bottom of the filter tank 3.

[0036] It should be noted that the sealing rotating seat 703 is always rotating and engaged with the bottom of the filter screen sleeve 6. This ensures that, while the turntable 701 can rotate normally, the impurities filtered by the filter screen sleeve 6 will not penetrate into the interior of the filter screen sleeve 6.

[0037] like Figure 8 As shown, the clutch sleeve 8 is coaxially disposed inside the extension sleeve 704. The inner wall of the clutch sleeve 8 is provided with a drive tooth groove 801 and a rotating tooth groove 802. The outer wall of the clutch sleeve 8 is provided with a scraping gear 803. The drive gear 504 is always meshed with the drive tooth groove 801. The rotating gear 505 corresponds to the rotating tooth groove 802. The scraping gear 803 corresponds to the scraping tooth groove 705.

[0038] Furthermore, the distance between the rotating gear 505 and the scraping tooth groove 705 is greater than the distance between the rotating tooth groove 802 and the scraping gear 803.

[0039] Specifically, by setting the clutch sleeve 8, when rotary filtration is required, the control bolt 10 is rotated to push the clutch sleeve 8 upward until the rotating tooth groove 802 meshes with the rotating gear 505. At this time, the scraping gear 803 disengages from the scraping tooth groove 705, and the drive shaft 501 will drive the outer shaft sleeve 502 to rotate synchronously through the clutch sleeve 8, so as to drive the absorption filter element 503 to adsorb and filter the water. When rinsing and cleaning are required, the control bolt 10 is rotated in the opposite direction to pull the clutch sleeve 8 downward until the scraping gear 803 meshes with the scraping tooth groove 705. At this time, the rotating tooth groove 802 disengages from the rotating gear 505, and the drive shaft 501 will drive the turntable 701 to rotate synchronously through the clutch sleeve 8, so as to drive the scraper plate 702 to perform scraping and cleaning. Thus, the different clutch states of the clutch sleeve 8 can be used to achieve flexible switching between filtration and cleaning actions.

[0040] It should be noted that the drive tooth groove 801 in this embodiment has a certain height, so that the drive gear 504 always remains engaged with the drive tooth groove 801, regardless of whether the clutch sleeve 8 moves upward or downward.

[0041] like Figure 7 and Figure 8 As shown, the valve plate 9 is attached to the bottom of the base plate 401. A first drain hole 402 is provided through the base plate 401, and a second drain hole 901 is provided through the valve plate 9. The first drain hole 402 and the second drain hole 901 are arranged in the same way.

[0042] like Figure 3 As shown, the inlet 101 is connected to the filter tank 3, and a water suction hole 103 is provided through the pipe 1. The outlet 102 is connected to the inside of the filter tank 3 through the water suction hole 103.

[0043] Specifically, during normal rotary filtration, rotating the valve plate 9 causes the first drain hole 402 and the second drain hole 901 to be staggered. At this time, the valve plate 9 will close the first drain hole 402 to prevent water leakage during filtration. Thus, the water pump at the outlet 102 (not shown in the figure) can draw out the filtered clean water from the water inlet 103. During rinsing and cleaning, rotating the valve plate 9 causes the first drain hole 402 and the second drain hole 901 to overlap. At this time, the first drain hole 402 is opened, and the rinsing wastewater will be discharged directly from the bottom of the bottom valve 4 through the first drain hole 402, thereby preventing the rinsing wastewater from contaminating the drainage channel of the filtered clean water.

[0044] The working principle of this invention is as follows: Figures 1-8 As shown, during use, the filter sleeve 6 divides the filter tank 3 into two chambers, an inner and an outer chamber. The inlet 101 is connected to the outer chamber, and the outlet 102 is connected to the inner chamber. Simultaneously, the bottom of the filter tank 3 is connected to the bottom valve 4. During wastewater filtration, wastewater enters the filter tank 3 through the inlet 101. Rotating the control bolt 10 pushes the clutch sleeve 8 upwards until the rotating tooth groove 802 meshes with the rotating gear 505. At this point, the scraping gear 803 disengages from the scraping tooth groove 705. The drive shaft 501 then drives the outer shaft sleeve 502 to rotate synchronously through the clutch sleeve 8. The wastewater undergoes preliminary filtration through the filter sleeve 6 before entering the inner chamber. Secondary filtration is performed by the absorption filter element 503. The filtered clean water is drawn out through the outlet 102. During the tank rinsing and cleaning, the control bolt 10 is rotated in the opposite direction to pull the clutch sleeve 8 downward until the scraping gear 803 meshes with the scraping tooth groove 705. At this time, the rotating tooth groove 802 disengages from the rotating gear 505. The drive shaft 501 drives the turntable 701 to rotate synchronously through the clutch sleeve 8, so as to drive the scraper 702 to perform scraping and cleaning. At the same time, the wastewater after rinsing will be discharged from the bottom valve 4 at the bottom. This allows the filtered clean water outlet and the cleaning wastewater outlet to be independently separated, avoiding pollution interference caused by the same drain outlet during the drainage process.

[0045] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A mechanical filter for wastewater treatment that is easy to clean, comprising a pipe body (1), wherein an inlet (101) and an outlet (102) are respectively connected to both ends of the pipe body (1), characterized in that, An end cap (2) is fixedly installed at the upper end of the tube body (1), and a drive motor (201) is fixedly installed on the end cap (2). A filter tank (3) is assembled and connected to the bottom of the tube body (1), and a bottom valve (4) is assembled and connected to the bottom of the filter tank (3). A filter screen sleeve (6) is installed inside the filter tank (3), and the top end of the filter screen sleeve (6) is fixedly connected to the tube body (1). A spindle assembly (5) is coaxially arranged inside the filter screen sleeve (6). The output end of the drive motor (201) is connected to the spindle assembly (5). A sweeping device is installed inside the bottom valve (4). The scraper assembly (7) has a clutch sleeve (8) at the bottom of the spindle assembly (5), a base plate (401) is fixedly installed inside the bottom valve (4), a fixing screw sleeve (11) is provided in the center of the base plate (401), a control bolt (10) is rotatably installed on the internal thread of the fixing screw sleeve (11), the top of the control bolt (10) is rotatably engaged with the bottom of the clutch sleeve (8), the control bolt (10) realizes the clutch switching between the filtering action and the cleaning action through the clutch sleeve (8), and a valve plate (9) for controlling the discharge of flushing wastewater is rotatably installed on the outside of the clutch sleeve (8). The spindle assembly (5) includes a drive shaft (501) coaxially arranged with the filter sleeve (6), the output end of the drive motor (201) is connected to the drive shaft (501), an outer sleeve (502) is sleeved on the outside of the drive shaft (501), an absorption filter element (503) is uniformly arranged circumferentially on the outer wall of the outer sleeve (502), the outer sleeve (502) is rotatably engaged with the bottom of the filter sleeve (6), a drive gear (504) is sleeved on the bottom of the drive shaft (501), and a rotating gear (505) is sleeved on the bottom of the outer sleeve (502). The outer wall of the drive shaft (501) is provided with an annular protrusion (5011), and the inner wall of the outer bushing (502) is provided with an annular groove (5021). The annular protrusion (5011) is adapted to be rotatably installed in the annular groove (5021). The scraping assembly (7) includes a turntable (701), which is rotatably engaged with the bottom valve (4). Scraper blades (702) are evenly arranged around the upper end of the turntable (701). The two sides of the scraper blades (702) are respectively in contact with the inner wall of the filter tank (3) and the outer wall of the filter screen sleeve (6). A sealing rotating seat (703) is provided at the upper end of the scraper blades (702). The bottom end of the filter screen sleeve (6) is rotatably engaged with the sealing rotating seat (703). An extension sleeve (704) is provided in the center of the turntable (701). Scraping tooth grooves (705) are provided on the inner wall of the extension sleeve (704). A water outlet hole (706) is provided through the turntable (701). The clutch sleeve (8) is coaxially disposed inside the extension sleeve (704). The inner wall of the clutch sleeve (8) is provided with a drive tooth groove (801) and a rotating tooth groove (802). The outer wall of the clutch sleeve (8) is provided with a scraping gear (803). The drive gear (504) is always meshed with the drive tooth groove (801). The rotating gear (505) corresponds to the rotating tooth groove (802). The scraping gear (803) corresponds to the scraping tooth groove (705).

2. The mechanical filter for wastewater treatment that is easy to clean according to claim 1, characterized in that, The distance between the rotating gear (505) and the scraping tooth groove (705) is greater than the distance between the rotating tooth groove (802) and the scraping gear (803).

3. A mechanical filter for wastewater treatment that is easy to clean, as described in claim 1, is characterized in that... The valve plate (9) is attached to the bottom of the base plate (401). A first drain hole (402) is provided through the base plate (401), and a second drain hole (901) is provided through the valve plate (9). The first drain hole (402) and the second drain hole (901) are arranged in the same way.

4. A mechanical filter for wastewater treatment that is easy to clean, as described in claim 1, is characterized in that... The inlet (101) is connected to the filter tank (3), and a water extraction hole (103) is provided inside the pipe (1). The outlet (102) is connected to the inside of the filter tank (3) through the water extraction hole (103).

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