Ozone catalytic reactor for improving sewage catalytic effect

Abstract

The invention discloses an ozone catalytic reactor for improving a sewage catalytic effect, and relates to the technical field of sewage treatment.The ozone catalytic reactor comprises a catalytic oxidation tower main body, an ozone generation main body is installed on one side of the catalytic oxidation tower main body, and the ozone generation main body is used for providing ozone for the interior of the catalytic oxidation tower main body; the side surface of the catalytic oxidation tower main body is fixedly connected with a sewage inlet pipe. In the using process, clean water is injected into the catalytic oxidation tower body through the cleaning water pump to clean the catalyst bed, compressed air is introduced into the catalytic oxidation tower body through the flushing gas tank while the clean water is injected into the catalytic oxidation tower body, and the clean water is driven to clean the catalyst bed through upward movement of gas; the surface of the catalyst bed can be kept clean conveniently, clean sewage enters the maintaining tank through a first connecting pipe, at the moment, a first valve is closed, a second valve is opened, and the clean sewage is discharged outwards through a second drainage pipe.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to an ozone catalytic reactor for improving the catalytic effect of sewage. Background Art

[0002] In sewage treatment systems, catalytic treatment of sewage through ozone catalytic reactors is a commonly used sewage treatment process. Ozone catalytic reactors are used to efficiently treat pollutants such as organic matter and ammonia nitrogen in sewage. Its main working principle is to use ozone gas as an oxidant, promote ozone decomposition through catalysts to generate hydroxyl radicals, and generate free radical chain reactions to remove COD in sewage. This process is simple and efficient, and is an advanced oxidation technology with strong applicability. It is often used in sewage treatment systems because it does not require the addition of chemical reagents, does not produce secondary pollution, and has good treatment effects.

[0003] For example, announcement number: CN220812038U discloses "an ozone photocatalytic reactor", which includes a tank body, a water inlet system, an air inlet system, an ozone generating system, a mixing zone, a reaction zone and a granular photocatalyst. The tank body is provided with a water inlet system, an air inlet system, a mixing zone, a reaction zone, a three-phase separator, a gas-water separator, a water outlet connecting pipe, an air outlet pipe, a riser pipe and a reflux pipe; the sewage in the water inlet system enters the tank body in sequence through an inlet pump, a riser, a circulating pump, an inlet pipe, an annular water inlet main pipe, an inlet branch pipe and a water nozzle; the inlet system is connected to the ozone generating system outside the tank body, and the inlet system includes an inlet pipe, an annular air inlet main pipe, an inlet branch pipe and an ozone releaser; a plurality of ultraviolet lamps are provided outside the reaction zone, and a granular photocatalyst is provided inside the reaction zone.

[0004] However, in the prior art, sewage and ozone are reacted by a catalyst inside a catalytic oxidation tower to accelerate the catalytic reaction, and during the long-term treatment process, the surface of the catalyst bed will be coated with particulate pollutants produced by the reaction of sewage and ozone, resulting in a reduction in the catalytic effect of the catalyst, thereby causing the overall sewage catalytic efficiency of the ozone catalytic reactor to decrease, and the treatment capacity to decrease, resulting in incomplete sewage treatment. Summary of the invention

[0005] The object of the present invention is to provide an ozone catalytic reactor with improved catalytic effect on sewage, so as to solve the problem proposed in the above-mentioned background technology that sewage and ozone are reacted by a catalyst inside a catalytic oxidation tower to accelerate the catalytic reaction and treat the sewage. During the long-term treatment process, the surface of the catalyst bed will be coated with particulate pollutants produced by the reaction of sewage and ozone, resulting in a reduction in the catalytic effect of the catalyst, thereby causing the overall sewage catalytic efficiency of the ozone catalytic reactor to decrease, the treatment capacity to decrease, and the problem of incomplete sewage treatment.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an ozone catalytic reactor for improving the catalytic effect of sewage, comprising a catalytic oxidation tower body, an ozone generating body installed on one side of the catalytic oxidation tower body, the ozone generating body being used to provide ozone to the inside of the catalytic oxidation tower body, a sewage inlet pipe being fixedly connected to the side of the catalytic oxidation tower body, and a catalyst bed being installed inside the catalytic oxidation tower body, a cleaning water pump being arranged on one side of the catalytic oxidation tower body, one end of the cleaning water pump being fixedly connected to a clean water inlet pipe, and the other end of the cleaning water pump being fixedly connected to a clean water drain pipe, a No. 1 connecting shaft being rotatably connected to the inner wall of the catalytic oxidation tower body, a water wheel being fixedly connected to one end of the No. 1 connecting shaft, a No. 1 bevel gear being fixedly connected to the side of the water wheel, a No. 2 connecting shaft being rotatably connected to the center position of the catalyst bed, a No. 2 bevel gear being fixedly connected to the bottom of the No. 2 connecting shaft, the No. 1 bevel gear being meshed with the No. 2 bevel gear, a cleaning brush being fixedly connected to the surface of the No. 2 connecting shaft, and the cleaning brush being in contact with the surface of the catalyst bed.

[0007] After the present invention has been used for a period of time, sewage is no longer introduced into the sewage inlet pipe, and clean water is injected into the main body of the catalytic oxidation tower using a cleaning water pump to clean the catalyst bed. While clean water is injected into the main body of the catalytic oxidation tower, compressed air is introduced into the main body of the catalytic oxidation tower through a flushing gas tank, and the clean water is driven to clean the catalyst bed by the upward movement of the gas. The clean sewage enters the interior of the maintenance tank through the No. 1 connecting pipe, and at this time, the No. 1 valve is closed and the No. 2 valve is opened, and the clean sewage is discharged outward through the No. 2 drainage pipe for collection;

[0008] Clean water is discharged from the end of the clean water drain pipe, and the power of the water flow drives the water wheel to rotate, which drives the No. 1 bevel gear and the No. 2 bevel gear to rotate, and the No. 2 bevel gear drives the No. 2 connecting shaft and the cleaning brush to rotate, and the cleaning brush is used to clean the surface of the catalyst bed, so that the surface of the catalyst bed can be cleaned more thoroughly, while improving the cleaning speed.

[0009] Preferably, the clean water inlet pipe is externally connected to a clean water storage tank, and the outlet end of the clean water discharge pipe is located above the water wheel.

[0010] Preferably, a No. 1 connecting pipe is fixedly connected to the upper portion of the catalytic oxidation tower body, and one end of the No. 1 connecting pipe is fixedly connected to a maintaining tank.

[0011] Preferably, a No. 1 drain pipe is fixedly connected to the side of the maintenance tank, and a No. 1 valve is fixedly connected to the surface of the No. 1 drain pipe.

[0012] Preferably, a No. 2 drain pipe is fixedly connected to the side of the No. 1 drain pipe, a No. 2 valve is fixedly connected to the surface of the No. 2 drain pipe, and the No. 2 drain pipe is externally connected to a sewage collection tank.

[0013] Preferably, a No. 2 connecting pipe is fixedly connected to the upper portion of the maintenance tank, and an exhaust gas destroyer is fixedly connected to one end of the No. 2 connecting pipe.

[0014] Preferably, a No. 4 connecting pipe is fixedly connected to one end of the ozone generating body, and a plurality of No. 1 connecting branch pipes are fixedly connected to the side of the No. 4 connecting pipe, and the plurality of No. 1 connecting branch pipes are evenly distributed on the side of the No. 4 connecting pipe.

[0015] Preferably, the end of the fourth connecting pipe is fixedly connected to an exhaust main pipe, and a plurality of exhaust branch pipes are installed on the upper part of the exhaust main pipe.

[0016] Preferably, a No. 3 connecting pipe is fixedly connected to the side of the No. 4 connecting pipe, a No. 3 valve is installed on the surface of the No. 3 connecting pipe, and a flushing gas tank is fixedly connected to one end of the clean water inlet pipe.

[0017] Preferably, a plurality of No. 2 connecting branch pipes are fixedly connected to the side of the sewage inlet pipe, and the plurality of No. 2 connecting branch pipes are evenly distributed on the side of the sewage inlet pipe. The end of the No. 2 connecting branch pipe is fixedly connected to a drainage main pipe, a drainage branch pipe is fixedly connected below the drainage main pipe, and the drainage branch pipe is located above the exhaust branch pipe.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, a cleaning water pump is used to inject clean water into the main body of the catalytic oxidation tower to clean the catalyst bed. While the clean water is injected into the main body of the catalytic oxidation tower, compressed air is introduced into the main body of the catalytic oxidation tower through a flushing gas tank. The clean water moves upward to clean the catalyst bed, so that the surface of the catalyst bed can be kept clean. The clean sewage enters the maintenance tank through the No. 1 connecting pipe. At this time, the No. 1 valve is closed and the No. 2 valve is opened, and the clean sewage is discharged to the outside through the No. 2 drain pipe.

[0020] 2. In the present invention, clean water is discharged from the end of the clean water drainage pipe, and the water wheel is driven to rotate by the power of the water flow, and the water wheel drives the No. 1 bevel gear and the No. 2 bevel gear to rotate, and the No. 2 bevel gear drives the No. 2 connecting shaft and the cleaning brush to rotate, and the cleaning brush is used to clean the surface of the catalyst bed, so that the surface of the catalyst bed can be cleaned more fully, while improving the cleaning speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a first three-dimensional structural schematic diagram of an ozone catalytic reactor for improving the catalytic effect of sewage according to the present invention;

[0022] Figure 2 It is a second three-dimensional structural schematic diagram of an ozone catalytic reactor for improving the catalytic effect of sewage according to the present invention;

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of an exhaust pipe in an ozone catalytic reactor for improving the catalytic effect of sewage according to the present invention;

[0024] Figure 4 It is a schematic cross-sectional structure diagram of a catalytic oxidation tower body in an ozone catalytic reactor for improving the catalytic effect of sewage according to the present invention;

[0025] Figure 5 The present invention is a schematic diagram of the three-dimensional structure of a cleaning brush in an ozone catalytic reactor for improving the catalytic effect of sewage.

[0026] In the figure: 1. Catalytic oxidation tower body; 2. Ozone generating body; 3. Maintenance tank; 4. Tail gas destroyer; 5. Flushing gas tank; 6. No. 1 connecting pipe; 7. No. 1 drainage pipe; 8. No. 1 valve; 9. No. 2 drainage pipe; 10. No. 2 valve; 11. No. 2 connecting pipe; 12. No. 3 connecting pipe; 13. Sewage inlet pipe; 14. Cleaning water pump; 15. Clean water inlet pipe; 16. Clean water drainage pipe; 17. No. 4 connecting pipe; 18. No. 1 connecting branch pipe; 19. Exhaust main pipe; 20. No. 3 valve; 21. No. 2 connecting branch pipe; 22. Drainage main pipe; 23. Catalyst bed; 24. No. 1 connecting shaft; 25. Water wheel; 26. No. 1 bevel gear; 27. No. 2 connecting shaft; 28. No. 2 bevel gear; 29. ​​Cleaning brush. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1: Reference Figure 1 - Figure 5As shown: an ozone catalytic reactor for improving the catalytic effect of sewage, comprising a catalytic oxidation tower body 1, an ozone generating body 2 is installed on one side of the catalytic oxidation tower body 1, and the ozone generating body 2 is used to provide ozone to the inside of the catalytic oxidation tower body 1, a sewage inlet pipe 13 is fixedly connected to the side of the catalytic oxidation tower body 1, and a catalyst bed 23 is installed inside the catalytic oxidation tower body 1, a cleaning water pump 14 is arranged on one side of the catalytic oxidation tower body 1, one end of the cleaning water pump 14 is fixedly connected to a clean water inlet pipe 15, and the other end of the cleaning water pump 14 is fixedly connected to a clean water inlet pipe 15. A clean water drainage pipe 16 is fixedly connected, a No. 1 connecting shaft 24 is rotatably connected to the inner wall of the catalytic oxidation tower body 1, a water wheel 25 is fixedly connected to one end of the No. 1 connecting shaft 24, a No. 1 bevel gear 26 is fixedly connected to the side of the water wheel 25, a No. 2 connecting shaft 27 is rotatably connected to the center of the catalyst bed 23, a No. 2 bevel gear 28 is fixedly connected to the bottom of the No. 2 connecting shaft 27, the No. 1 bevel gear 26 is meshed with the No. 2 bevel gear 28, a cleaning brush 29 is fixedly connected to the surface of the No. 2 connecting shaft 27, and the cleaning brush 29 is in contact with the surface of the catalyst bed 23;

[0029] The clean water inlet pipe 15 is externally connected to a clean water storage tank, the outlet end of the clean water drain pipe 16 is located above the water wheel 25, the side of the No. 4 connecting pipe 17 is fixedly connected to the No. 3 connecting pipe 12, the surface of the No. 3 connecting pipe 12 is installed with a No. 3 valve 20, and one end of the clean water inlet pipe 15 is fixedly connected to a flushing gas tank 5, the upper part of the catalytic oxidation tower main body 1 is fixedly connected to the No. 1 connecting pipe 6, one end of the No. 1 connecting pipe 6 is fixedly connected to the maintenance tank 3, the side of the maintenance tank 3 is fixedly connected to the No. 1 drain pipe 7, the surface of the No. 1 drain pipe 7 is fixedly connected to the No. 1 valve 8, the side of the No. 1 drain pipe 7 is fixedly connected to the No. 2 drain pipe 9, the surface of the No. 2 drain pipe 9 is fixedly connected to the No. 2 valve 10, the No. 2 drain pipe 9 is externally connected to a sewage collection tank, the upper part of the maintenance tank 3 is fixedly connected to the No. 2 connecting pipe 11, and one end of the No. 2 connecting pipe 11 is fixedly connected to the exhaust gas destroyer 4.

[0030] During use of the present invention, the sewage treated inside the catalytic oxidation tower body 1 enters the maintenance tank 3 to increase the reaction time of the sewage and ozone, the treated sewage is discharged through the No. 1 drainage pipe 7, and the exhaust gas enters the tail gas destroyer 4 through the No. 2 connecting pipe 11, and the exhaust gas is treated and discharged through the tail gas destroyer 4;

[0031] After the device has been used for a period of time, the sewage inlet pipe 13 no longer enters the sewage, and the cleaning water pump 14 is used to inject clean water into the catalytic oxidation tower body 1 to clean the catalyst bed 23. While the clean water is injected into the catalytic oxidation tower body 1, compressed air is introduced into the catalytic oxidation tower body 1 through the flushing gas tank 5, and the clean water is driven to clean the catalyst bed 23 by the upward movement of the gas. The clean sewage enters the maintenance tank 3 through the No. 1 connecting pipe 6. At this time, the No. 1 valve 8 is closed and the No. 2 valve 10 is opened, and the clean sewage is discharged to the outside through the No. 2 drainage pipe 9 for collection;

[0032] Clean water is discharged from the end of the clean water drainage pipe 16, and the power of the water flow drives the water wheel 25 to rotate, and the water wheel 25 drives the No. 1 bevel gear 26 and the No. 2 bevel gear 28 to rotate, and the No. 2 connecting shaft 27 and the cleaning brush 29 are driven by the No. 2 bevel gear 28 to rotate, and the surface of the catalyst bed 23 is cleaned by the cleaning brush 29, so that the surface of the catalyst bed 23 can be more fully cleaned, and the cleaning speed is increased at the same time, sewage is injected into the catalytic oxidation tower main body 1 through the sewage inlet pipe 13, and ozone is introduced into the catalytic oxidation tower main body 1 from the ozone generating body 2.

[0033] Embodiment 2: According to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a No. 4 connecting pipe 17 is fixedly connected to one end of the ozone generating body 2, and a plurality of No. 1 connecting branch pipes 18 are fixedly connected to the side of the No. 4 connecting pipe 17, and the plurality of No. 1 connecting branch pipes 18 are evenly distributed on the side of the No. 4 connecting pipe 17, and an exhaust main pipe 19 is fixedly connected to the end of the No. 4 connecting pipe 17, and a plurality of exhaust branch pipes are installed on the upper part of the exhaust main pipe 19, and a plurality of No. 2 connecting branch pipes 21 are fixedly connected to the side of the sewage inlet pipe 13, and the plurality of No. 2 connecting branch pipes 21 are evenly distributed on the side of the sewage inlet pipe 13, and a drainage main pipe 22 is fixedly connected to the end of the No. 2 connecting branch pipe 21, and a drainage branch pipe is fixedly connected to the bottom of the drainage main pipe 22, and the drainage branch pipe is located above the exhaust branch pipe.

[0034] In the present invention, sewage is injected into the catalytic oxidation tower body 1 through the sewage inlet pipe 13, and at the same time, ozone is introduced into the catalytic oxidation tower body 1 through the ozone generating body 2. The ozone passes through the No. 4 connecting pipe 17, the No. 1 connecting branch pipe 18 and the exhaust main pipe 19, and is finally discharged from the exhaust branch pipe at the upper part of the exhaust main pipe 19. At this time, the sewage is discharged from the No. 2 connecting branch pipe 21 and the drainage branch pipe at the bottom of the drainage main pipe 22. At this time, the sewage and the ozone will produce mutual impact, resulting in a moving mixing effect, so that the sewage and the ozone can be fully integrated, and then move upward through the catalyst bed 23 for catalytic reaction.

[0035] The use method and working principle of the device: When the present invention is used, sewage is injected into the catalytic oxidation tower body 1 through the sewage inlet pipe 13, and ozone is introduced into the catalytic oxidation tower body 1 through the ozone generator body 2. The ozone passes through the No. 4 connecting pipe 17, the No. 1 connecting branch pipe 18 and the exhaust main pipe 19, and is finally discharged from the exhaust branch pipe at the top of the exhaust main pipe 19. At this time, the sewage is discharged from the No. 2 connecting branch pipe 21 and the drainage branch pipe at the bottom of the drainage main pipe 22. At this time, the sewage and the ozone will produce mutual impact, produce a mobile mixing effect, so that the sewage and the ozone can be fused, and then move upward through the catalyst bed 23 to perform a catalytic reaction;

[0036] The sewage treated in the catalytic oxidation tower body 1 enters the maintenance tank 3 to increase the reaction time of the sewage and ozone. The treated sewage is discharged through the No. 1 drainage pipe 7, and the exhaust gas enters the tail gas destroyer 4 through the No. 2 connecting pipe 11. The exhaust gas is treated and discharged through the tail gas destroyer 4.

[0037] After the device has been used for a period of time, the sewage inlet pipe 13 no longer enters the sewage, and the cleaning water pump 14 is used to inject clean water into the catalytic oxidation tower body 1 to clean the catalyst bed 23. While the clean water is injected into the catalytic oxidation tower body 1, compressed air is introduced into the catalytic oxidation tower body 1 through the flushing gas tank 5, and the clean water is driven to clean the catalyst bed 23 by the upward movement of the gas. The clean sewage enters the maintenance tank 3 through the No. 1 connecting pipe 6. At this time, the No. 1 valve 8 is closed and the No. 2 valve 10 is opened, and the clean sewage is discharged to the outside through the No. 2 drainage pipe 9 for collection;

[0038] Clean water is discharged from the end of the clean water drainage pipe 16, and the power of the water flow drives the water wheel 25 to rotate, and the water wheel 25 drives the No. 1 bevel gear 26 and the No. 2 bevel gear 28 to rotate, and the No. 2 connecting shaft 27 and the cleaning brush 29 are driven to rotate by the No. 2 bevel gear 28. The cleaning brush 29 cleans the surface of the catalyst bed 23, so that the surface of the catalyst bed 23 can be more fully cleaned.

[0039] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ozone catalytic reactor for improving the catalytic effect of sewage, comprising a catalytic oxidation tower body (1), an ozone generating body (2) installed on one side of the catalytic oxidation tower body (1), the ozone generating body (2) is used to provide ozone to the inside of the catalytic oxidation tower body (1), a sewage inlet pipe (13) is fixedly connected to the side of the catalytic oxidation tower body (1), and a catalyst bed (23) is installed inside the catalytic oxidation tower body (1), characterized in that: A cleaning water pump (14) is provided on one side of the catalytic oxidation tower body (1), one end of the cleaning water pump (14) is fixedly connected to a clean water inlet pipe (15), and the other end of the cleaning water pump (14) is fixedly connected to a clean water outlet pipe (16). A first connecting shaft (24) is rotatably connected to the inner wall of the catalytic oxidation tower body (1), one end of the first connecting shaft (24) is fixedly connected to a water wheel (25), and a first bevel gear (26) is fixedly connected to the side of the water wheel (25). A second connecting shaft (27) is rotatably connected to the center of the catalyst bed (23), and a second bevel gear (28) is fixedly connected to the bottom of the second connecting shaft (27), the first bevel gear (26) is meshed with the second bevel gear (28), and a cleaning brush (29) is fixedly connected to the surface of the second connecting shaft (27), and the cleaning brush (29) is in contact with the surface of the catalyst bed (23).

2. The ozone catalytic reactor for improving the catalytic effect of sewage according to claim 1, characterized in that: The clean water inlet pipe (15) is externally connected to a clean water storage tank, and the outlet end of the clean water discharge pipe (16) is located above the water wheel (25).

3. The ozone catalytic reactor for improving the catalytic effect of sewage according to claim 1, characterized in that: A first connecting pipe (6) is fixedly connected to the upper part of the catalytic oxidation tower body (1), and one end of the first connecting pipe (6) is fixedly connected to a maintenance tank (3).

4. The ozone catalytic reactor for improving the catalytic effect of sewage according to claim 3, characterized in that: A No. 1 drainage pipe (7) is fixedly connected to the side of the maintenance tank (3), and a No. 1 valve (8) is fixedly connected to the surface of the No. 1 drainage pipe (7).

5. The ozone catalytic reactor for improving the catalytic effect of sewage according to claim 4, characterized in that: The side of the No. 1 drainage pipe (7) is fixedly connected to a No. 2 drainage pipe (9), the surface of the No. 2 drainage pipe (9) is fixedly connected to a No. 2 valve (10), and the No. 2 drainage pipe (9) is externally connected to a sewage collection tank.

6. The ozone catalytic reactor for improving the catalytic effect of sewage according to claim 4, characterized in that: A second connecting pipe (11) is fixedly connected to the upper portion of the maintenance tank (3), and an exhaust gas destroyer (4) is fixedly connected to one end of the second connecting pipe (11).

7. The ozone catalytic reactor for improving the catalytic effect of sewage according to claim 1, characterized in that: A fourth connecting pipe (17) is fixedly connected to one end of the ozone generating body (2), and a plurality of first connecting branch pipes (18) are fixedly connected to the side of the fourth connecting pipe (17), and the plurality of first connecting branch pipes (18) are evenly distributed on the side of the fourth connecting pipe (17).

8. The ozone catalytic reactor for improving the catalytic effect of sewage according to claim 7, characterized in that: The end of the fourth connecting pipe (17) is fixedly connected to an exhaust main pipe (19), and a plurality of exhaust branch pipes are installed on the upper part of the exhaust main pipe (19).

9. The ozone catalytic reactor for improving the catalytic effect of sewage according to claim 8, characterized in that: The side of the No. 4 connecting pipe (17) is fixedly connected to the No. 3 connecting pipe (12), the surface of the No. 3 connecting pipe (12) is installed with a No. 3 valve (20), and one end of the clean water inlet pipe (15) is fixedly connected to a flushing gas tank (5).

10. The ozone catalytic reactor for improving the catalytic effect of sewage according to claim 1, characterized in that: A plurality of No. 2 connecting branch pipes (21) are fixedly connected to the side of the sewage inlet pipe (13), and the plurality of No. 2 connecting branch pipes (21) are evenly distributed on the side of the sewage inlet pipe (13). A drainage main pipe (22) is fixedly connected to the end of the No. 2 connecting branch pipe (21), and a drainage branch pipe is fixedly connected below the drainage main pipe (22), and the drainage branch pipe is located above the exhaust branch pipe.

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