A catalytic oxidation coupling filtration integrated sewage treatment integrated filter tank

Abstract

The utility model belongs to sewage treatment technical field especially relates to a kind of catalytic oxidation coupling filtration integrated sewage treatment integrated filter tank, comprising: tank body, multiple filter screens are rotatably installed in the tank body, multiple discharge ports are formed in the side of the tank body, the inner side wall of multiple discharge ports is all formed with inner groove, when filter screen is blocked, start motor drives screw rod to rotate, when screw rod rotates, multiple sliding blocks are driven to move by multiple thread sleeves, multiple sliding blocks will drive multiple sealing plates to move, when multiple sealing plates descend, lifting plate is driven to descend by slide bar, since roller is contacted with filter screen, filter screen also changes with the descending angle of lifting plate, when sealing plate descends to the most lower position, filter screen also presents maximum inclination angle, the side of filter screen can be located in the side of discharge port at this time, start nozzle at this time, the water that nozzle sprays can flush the surface of filter screen.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to an integrated wastewater treatment filter tank that combines catalytic oxidation and filtration. Background Technology

[0002] Wastewater treatment is the process of purifying wastewater to meet the water quality requirements for discharge into a water body or for reuse. Wastewater treatment is widely used in construction, agriculture, transportation, medical care and catering, and is increasingly becoming a part of the daily lives of ordinary people.

[0003] Existing filter tanks typically use filter screens to pre-treat wastewater and remove impurities. However, due to long-term use, impurities can clog the filter screens, requiring regular cleaning. Many filter tanks have multiple filter screens installed inside, necessitating manual removal of each screen for cleaning, which is inconvenient. Therefore, we propose an integrated wastewater treatment filter tank that combines catalytic oxidation and filtration. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned technical problems by providing an integrated wastewater treatment filter tank that combines catalytic oxidation and filtration, thereby resolving the issues raised in the background section.

[0005] In view of this, the present invention provides an integrated wastewater treatment filter tank with catalytic oxidation coupled filtration, comprising:

[0006] The tank body has multiple filter screens rotatably installed inside it. Multiple discharge ports are opened on one side of the tank body. The inner walls of the multiple discharge ports are provided with inner grooves. Sealing plates are slidably installed in the multiple inner grooves. The multiple discharge ports are respectively located on one side of the multiple filter screens.

[0007] Multiple lifting plates are slidably installed on the inner side wall of the tank. Multiple fixing rods are fixedly installed on the top surface of each lifting plate. Each fixing rod has a rod groove at its top end. Rollers are rotatably installed in each rod groove. Each roller contacts the bottom surface of a multiple filter screen.

[0008] Multiple sluices are formed inside one side of the tank body. The multiple sluices are respectively connected to multiple inner grooves. Each of the multiple sluices has a sliding rod slidably installed in it. One end of each of the multiple sliding rods is fixedly connected to one side of multiple lifting plates, and the other end of each of the multiple sliding rods is fixedly connected to one side of multiple sealing plates.

[0009] A lifting assembly is mounted on the tank body and is used to move multiple sealing plates.

[0010] Multiple water inlet boxes are rotatably installed inside the tank. The multiple water inlet boxes are respectively located above multiple filter screens, and multiple nozzles are fixedly installed on one side of each of the multiple water inlet boxes.

[0011] Multiple sets of adjustment components are respectively installed inside the tank and are used to drive multiple water inlet boxes to rotate.

[0012] In the above technical solution, the lifting assembly further includes multiple side grooves, which are formed on one side of the tank body and are connected to multiple inner grooves. Each side groove contains a slider, one end of which is fixedly connected to one side of a plurality of sealing plates. Two mounting plates are fixedly mounted on one side of the tank body, and a lead screw is rotatably mounted between the two mounting plates. Multiple threaded sleeves are threaded onto the lead screw. The other ends of the sliders are fixedly connected to one side of the threaded sleeves. A motor is fixedly mounted on the top surface of one of the mounting plates, and the bottom end of the motor's output shaft is fixedly connected to the top end of the lead screw. Starting the motor drives the lead screw to rotate. When the lead screw rotates, it moves multiple sliders through the threaded sleeves, which in turn move multiple sealing plates. When the sealing plates descend, the lifting plate descends via a sliding rod. Because the rollers contact the filter screen, the filter screen changes angle as the lifting plate descends. When the sealing plate descends to its lowest position, the filter screen reaches its maximum tilt angle.

[0013] In the above technical solution, the adjustment component further includes a second fixed seat, which is fixedly installed on one side of the water inlet box. A first fixed seat is fixedly installed on one side of the inside of the tank. An electric push rod is rotatably installed inside the first fixed seat. The bottom end of the electric push rod is rotatably installed inside the second fixed seat. When the nozzle washes the impurities on the surface of the filter screen, the electric push rod is activated. Through the cooperation of the first fixed seat and the second fixed seat, the water inlet box is rotated, thereby adjusting the angle of the water inlet box. This achieves the angle adjustment of the nozzle, enhances the convenience of washing the surface of the filter screen, and thus enhances the effect of washing the filter screen.

[0014] In the above technical solution, a water storage tank is fixedly installed on one side of the tank body, and multiple water delivery hoses are fixedly installed on one side of the water storage tank. The multiple water delivery hoses penetrate the outer wall of the tank body and extend into the tank body. One end of the multiple water delivery hoses is fixedly connected to one side of multiple water inlet boxes respectively. Water in the water storage tank can be transported to the water inlet boxes through the water delivery hoses, and then the filter screen can be rinsed through the nozzle.

[0015] In the above technical solution, a plurality of support legs are fixedly installed on the bottom surface of the tank, which enhances the stability of the tank when it is placed.

[0016] In the above technical solution, a discharge pipe is further fixedly installed on the bottom surface of the tank, and a valve is provided on the discharge pipe. After the solution is filtered, the valve is opened, and the filtered solution is discharged through the discharge pipe.

[0017] In the above technical solution, furthermore, a plurality of side platforms are fixedly installed on one side of the tank body, and a collection box is provided on the top surface of each of the plurality of side platforms. The plurality of collection boxes are respectively located on one side of a plurality of discharge ports. The filter screen is in an inclined state, and the impurities attached to the surface of the filter screen will also be washed to the discharge port, and then the impurities will be transported to the collection box through the discharge port, thereby realizing the collection of impurities.

[0018] In the above technical solution, furthermore, the diameter of the filter holes on the plurality of filter screens decreases sequentially from top to bottom.

[0019] The beneficial effects of this utility model are:

[0020] 1. This integrated wastewater treatment filter tank with catalytic oxidation coupling filtration works as follows: When the filter screen becomes clogged, the motor drives the lead screw to rotate. As the lead screw rotates, multiple threaded sleeves move multiple sliders, which in turn move multiple sealing plates. When the sealing plates descend, a lifting plate descends via a sliding rod. Because the rollers contact the filter screen, the filter screen's angle changes as the lifting plate descends. When the sealing plate reaches its lowest position, the filter screen is at its maximum tilt angle, with one side of the filter screen positioned near the discharge port. At this point, the spray nozzles are activated, and the water sprayed from the nozzles washes the surface of the filter screen. Since the filter screen is tilted, impurities adhering to its surface are washed to the discharge port and then transported to the collection tank, thus achieving self-cleaning of the device. This method enhances the convenience of cleaning the filter screen and improves its performance, making it quite practical.

[0021] 2. The integrated wastewater treatment filter tank with catalytic oxidation coupling filtration has multiple protective plates fixedly installed on the inner side wall of the tank. The multiple protective plates are respectively located above multiple water inlet boxes. The multiple protective plates are inclined in the tank and are located above the water inlet boxes. The protective plates can protect the nozzles on the water inlet boxes and prevent sewage from entering the nozzles and causing damage to the nozzles. Attached Figure Description

[0022] Figure 1 This is one of the three-dimensional structural schematic diagrams of this utility model;

[0023] Figure 2 This is the second three-dimensional structural schematic diagram of this utility model;

[0024] Figure 3This is the third three-dimensional structural schematic diagram of this utility model;

[0025] Figure 4 This is a schematic diagram of the internal structure of the tank of this utility model;

[0026] Figure 5 This is a schematic diagram of the filter screen in an inclined state according to this utility model;

[0027] Figure 6 This is the utility model Figure 5 Enlarged structural diagram of section A in the middle;

[0028] Figure 7 This is a schematic diagram of the cross-sectional structure of the tank body of this utility model.

[0029] The markings in the diagram are as follows:

[0030] 1. Tank body; 2. Filter screen; 3. Discharge port; 4. Inner groove; 5. Sealing plate; 6. Lifting plate; 7. Slide groove; 8. Slide rod; 9. Fixed rod; 10. Rod groove; 11. Roller; 12. Mounting plate; 13. Lead screw; 14. Motor; 15. Threaded sleeve; 16. Side groove; 17. Sliding block; 18. Discharge pipe; 19. Valve; 20. Support leg; 21. Water inlet box; 22. Nozzle; 23. Water storage tank; 24. Water delivery hose; 25. First fixed seat; 26. Second fixed seat; 27. Electric push rod; 28. Protective plate; 29. ​​Side platform; 30. Collection box. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0032] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0033] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0034] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0035] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples. Example 1

[0036] Please see Figures 1-7 As shown in the figure, this embodiment provides an integrated filter tank for wastewater treatment that combines catalytic oxidation and filtration.

[0037] include:

[0038] Tank 1, with multiple filter screens 2 rotatably installed inside. Multiple discharge ports 3 are located on one side of tank 1, each with an inner groove 4 on its inner wall. Sealing plates 5 are slidably installed within each inner groove 4. The discharge ports 3 are located on one side of each filter screen 2. Multiple lifting plates 6 are slidably installed on the inner wall of tank 1. Multiple fixing rods 9 are fixedly installed on the top surface of each lifting plate 6. Rod grooves 10 are formed at the top of each fixing rod 9, and rollers 11 are rotatably installed within each rod groove 10. Each roller 11 contacts the bottom surface of each filter screen 2. Multiple sliding grooves 7 are located on one side of the interior of tank 1. Each slide groove 7 is connected to multiple inner grooves 4. Each slide groove 7 has a sliding rod 8 slidably installed inside it. One end of each sliding rod 8 is fixedly connected to one side of each lifting plate 6, and the other end of each sliding rod 8 is fixedly connected to one side of each sealing plate 5. A lifting assembly is installed on the tank body 1 and is used to move the multiple sealing plates 5. Multiple water inlet boxes 21 are rotatably installed inside the tank body 1. Each water inlet box 21 is located above multiple filter screens 2, and multiple nozzles 22 are fixedly installed on one side of each water inlet box 21. Multiple adjustment assemblies are installed inside the tank body 1 and are used to drive the multiple water inlet boxes 21 to rotate. Example 2

[0039] This embodiment provides an integrated filter tank for catalytic oxidation coupled with filtration for wastewater treatment. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0040] The lifting assembly includes multiple side grooves 16, which are formed on one side of the tank body 1. Each side groove 16 is connected to multiple inner grooves 4. Sliding sliders 17 are slidably installed within each side groove 16. One end of each sliding slider 17 is fixedly connected to one side of each sealing plate 5. Two mounting plates 12 are fixedly installed on one side of the tank body 1. A single lead screw 13 is rotatably mounted between the two mounting plates 12. Multiple threaded sleeves 15 are threaded onto the lead screw 13. The other ends of each sliding slider 17 are fixedly connected to one side of each threaded sleeve 15. One of the mounting plates 1... A motor 14 is fixedly installed on the top surface of 2. The bottom end of the output shaft of the motor 14 is fixedly connected to the top end of the lead screw 13. When the motor 14 is started, the lead screw 13 is driven to rotate. When the lead screw 13 rotates, it will drive multiple sliders 17 to move through multiple threaded sleeves 15. The multiple sliders 17 will drive multiple sealing plates 5 to move. When the multiple sealing plates 5 descend, they will drive the lifting plate 6 to descend through the slide rod 8. Since the roller 11 is in contact with the filter screen 2, the filter screen 2 will also change its angle as the lifting plate 6 descends. When the sealing plate 5 descends to the lowest position, the filter screen 2 will also present the maximum tilt angle. Example 3

[0041] This embodiment provides an integrated filter tank for catalytic oxidation coupled with filtration for wastewater treatment. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0042] The adjustment assembly includes a second fixed base 26, which is fixedly installed on one side of the water inlet box 21. A first fixed base 25 is fixedly installed on one side of the tank body 1. An electric push rod 27 is rotatably installed inside the first fixed base 25. The bottom end of the electric push rod 27 is rotatably installed inside the second fixed base 26. When the nozzle 22 rinses impurities on the surface of the filter screen 2, the electric push rod 27 is activated. The interaction between the first fixed base 25 and the second fixed base 26 causes the water inlet box 21 to rotate, thereby adjusting the angle of the water inlet box 21. This achieves the angle adjustment of the nozzle 22, enhancing the convenience of rinsing the surface of the filter screen 2 and thus improving the rinsing effect. Example 4

[0043] This embodiment provides an integrated filter tank for catalytic oxidation coupled with filtration for wastewater treatment. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0044] A water storage tank 23 is fixedly installed on one side of the tank body 1. Multiple water delivery hoses 24 are fixedly installed on one side of the water storage tank 23. The multiple water delivery hoses 24 penetrate through the outer wall of the tank body 1 and extend into the tank body 1. One end of the multiple water delivery hoses 24 is fixedly connected to one side of multiple water inlet boxes 21. Water in the water storage tank 23 can be transported to the water inlet box 21 through the water delivery hoses 24, and then the filter screen 2 is rinsed through the nozzle 22. Example 5

[0045] This embodiment provides an integrated filter tank for catalytic oxidation coupled with filtration for wastewater treatment. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0046] The bottom surface of the tank 1 is fixedly equipped with multiple support legs 20, which enhances the stability of the tank 1 when it is placed.

[0047] The bottom surface of the tank 1 is fixedly equipped with a discharge pipe 18, and a valve 19 is provided on the discharge pipe 18. After the solution is filtered, the filtered solution is discharged through the discharge pipe 18 by opening the valve 19.

[0048] The tank body 1 has multiple side platforms 29 fixedly installed on one side. Each side platform 29 has a collection box 30 on its top surface. The collection boxes 30 are located on one side of multiple discharge ports 3. The filter screen 2 is tilted. Impurities attached to the surface of the filter screen 2 will be washed to the discharge port 3 and then transported to the collection box 30 through the discharge port 3, thereby realizing the collection of impurities. Example 6

[0049] This embodiment provides an integrated filter tank for catalytic oxidation coupled with filtration for wastewater treatment. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0050] Among them, the diameter of the filter holes on the multiple filter screens 2 decreases from top to bottom.

[0051] Multiple protective plates 28 are fixedly installed on the inner side wall of the tank body 1. The multiple protective plates 28 are located above multiple water inlet boxes 21. The multiple protective plates 28 are inclined inside the tank body 1. The protective plates 28 are located above the water inlet boxes 21 to protect the nozzles 22 on the water inlet boxes 21 and prevent sewage from entering the nozzles 22 and causing damage to the nozzles 22.

[0052] In use: When the filter screen 2 becomes clogged, the motor 14 is started to drive the lead screw 13 to rotate. When the lead screw 13 rotates, it drives multiple sliders 17 to move through multiple threaded sleeves 15. The multiple sliders 17 drive multiple sealing plates 5 to move. When the multiple sealing plates 5 descend, they drive the lifting plate 6 to descend through the slide rod 8. Since the roller 11 is in contact with the filter screen 2, the filter screen 2 will also change its angle as the lifting plate 6 descends. When the sealing plate 5 descends to the lowest position, the filter screen 2 will also be at its maximum tilt angle. At this time, one side of the filter screen 2 will be located on the side of the discharge port 3. At this time, the nozzle 22 is started, and the water sprayed from the nozzle 22 will wash the surface of the filter screen 2. Since the filter screen 2 is in a tilted state, the impurities attached to the surface of the filter screen 2 will also be washed to the discharge port 3. Then, the impurities are transported to the collection box 30 through the discharge port 3, thereby realizing the self-cleaning of the device. In this way, the convenience of cleaning the filter screen 2 is enhanced, the use effect of the filter screen 2 is enhanced, and it is more practical.

[0053] When the nozzle 22 rinses the impurities on the surface of the filter screen 2, the electric push rod 27 is activated. Through the cooperation of the first fixed seat 25 and the second fixed seat 26, the water inlet box 21 is rotated, thereby adjusting the angle of the water inlet box 21. This achieves the angle adjustment of the nozzle 22, enhancing the convenience of rinsing the surface of the filter screen 2 and thus enhancing the rinsing effect of the filter screen 2.

[0054] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An integrated wastewater treatment filter tank with catalytic oxidation coupled with filtration, characterized in that, include: Tank (1), a plurality of filter screens (2) are rotatably installed inside the tank (1), a plurality of discharge ports (3) are opened on one side of the tank (1), an inner groove (4) is opened on the inner side wall of the plurality of discharge ports (3), a sealing plate (5) is slidably installed in the plurality of inner grooves (4), and the plurality of discharge ports (3) are respectively located on one side of the plurality of filter screens (2); Multiple lifting plates (6) are slidably installed on the inner side wall of the tank (1). Multiple fixing rods (9) are fixedly installed on the top surface of each of the multiple lifting plates (6). A rod groove (10) is opened at the top of each of the multiple fixing rods (9). A roller (11) is rotatably installed in each of the multiple rod grooves (10). The multiple rollers (11) are in contact with the bottom surface of the multiple filter screens (2). Multiple slids (7) are formed inside one side of the tank body (1). The multiple slids (7) are connected to multiple inner grooves (4) respectively. Each of the multiple slids (7) has a sliding rod (8) slidably installed inside it. One end of each sliding rod (8) is fixedly connected to one side of multiple lifting plates (6) respectively, and the other end of each sliding rod (8) is fixedly connected to one side of multiple sealing plates (5). A lifting assembly is mounted on the tank body (1) and is used to move multiple sealing plates (5); Multiple water inlet boxes (21) are rotatably installed inside the tank (1). The multiple water inlet boxes (21) are respectively located above multiple filter screens (2). Multiple nozzles (22) are fixedly installed on one side of each of the multiple water inlet boxes (21). Multiple sets of adjustment components are respectively installed inside the tank (1) and are used to drive multiple water inlet boxes (21) to rotate.

2. The integrated wastewater treatment filter tank with catalytic oxidation coupling filtration as described in claim 1, characterized in that, The lifting assembly includes multiple side grooves (16), which are opened on one side of the tank body (1). The multiple side grooves (16) are connected to multiple inner grooves (4) respectively. Slider (17) is slidably installed in each of the multiple side grooves (16). One end of each of the multiple sliders (17) is fixedly connected to one side of each of the multiple sealing plates (5). Two mounting plates (12) are fixedly installed on one side of the tank body (1). The same lead screw (13) is rotatably installed between the two mounting plates (12). Multiple threaded sleeves (15) are threadedly connected to the lead screw (13). The other end of each of the multiple sliders (17) is fixedly connected to one side of each of the multiple threaded sleeves (15). A motor (14) is fixedly installed on the top surface of one of the mounting plates (12). The bottom end of the output shaft of the motor (14) is fixedly connected to the top end of the lead screw (13).

3. The integrated wastewater treatment filter tank with catalytic oxidation coupling filtration as described in claim 1, characterized in that, The adjustment assembly includes a second fixed seat (26), which is fixedly installed on one side of the water inlet box (21). A first fixed seat (25) is fixedly installed on one side of the inside of the tank (1). An electric push rod (27) is rotatably installed inside the first fixed seat (25). The bottom end of the electric push rod (27) is rotatably installed inside the second fixed seat (26).

4. The integrated wastewater treatment filter tank with catalytic oxidation coupling filtration as described in claim 1, characterized in that, A water storage tank (23) is fixedly installed on one side of the tank (1), and a plurality of water delivery hoses (24) are fixedly installed on one side of the water storage tank (23). The plurality of water delivery hoses (24) penetrate the outer wall of the tank (1) and extend into the tank (1). One end of the plurality of water delivery hoses (24) is fixedly connected to one side of a plurality of water inlet boxes (21).

5. The integrated wastewater treatment filter tank with catalytic oxidation coupling filtration as described in claim 1, characterized in that, Multiple support legs (20) are fixedly installed on the bottom surface of the tank (1).

6. The integrated wastewater treatment filter tank with catalytic oxidation coupling filtration as described in claim 1, characterized in that, A discharge pipe (18) is fixedly installed on the bottom surface of the tank (1), and a valve (19) is provided on the discharge pipe (18).

7. The integrated wastewater treatment filter tank with catalytic oxidation coupling filtration as described in claim 1, characterized in that, Multiple side platforms (29) are fixedly installed on one side of the tank (1), and collection boxes (30) are provided on the top surface of the multiple side platforms (29). The multiple collection boxes (30) are located on one side of the multiple discharge ports (3).

8. The integrated wastewater treatment filter tank with catalytic oxidation coupling filtration as described in claim 1, characterized in that, The diameter of the filter holes on the multiple filter screens (2) decreases from top to bottom.

9. The integrated wastewater treatment filter tank with catalytic oxidation coupling filtration according to claim 1, characterized in that, Multiple protective plates (28) are fixedly installed on the inner side wall of the tank (1). The multiple protective plates (28) are located above the multiple water inlet boxes (21) respectively, and the multiple protective plates (28) are inclined inside the tank (1).

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