Automatic drainage device and automatic drainage method for new energy automobile air reservoir

Abstract

The invention discloses an automatic drainage device and method for a new energy automobile air reservoir, and relates to the field of new energy automobiles, the automatic drainage device comprises an air inlet cylinder body, a drainage shell, a sealing top cover, a drainage pipeline and a drainage connector, the air inlet cylinder body is located on one side of the drainage shell, and the sealing top cover is fixedly installed at the upper end of the drainage shell. According to the automatic drainage device and method for the new energy automobile air reservoir, wind power generated in the operation process of a new energy automobile is used as a power source, extra electric power or external energy is not needed, the complete automation of the drainage process is achieved, accumulated water at the bottom of the air reservoir is rapidly sucked through the drainage pipeline, and the drainage efficiency is improved. Compared with traditional gravity drainage or passive valve control drainage, the rotary water suction mode has the advantages that higher efficiency is achieved, air pressure in the air storage cylinder is increased, the drainage process is assisted, drainage difficulty caused by negative pressure of the air storage cylinder is effectively prevented, and drainage efficiency and reliability are improved.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicles, and in particular to an automatic drainage device and method for air tanks in new energy vehicles. Background Technology

[0002] As an important development direction of green transportation, new energy vehicles have a key component called the air tank, which is used to store compressed air and is usually related to the braking system or suspension system. During vehicle operation, condensate is easily accumulated inside the air tank. If it cannot be drained in time, it will lead to corrosion, reduced efficiency, or even safety hazards. Therefore, the automatic drainage device of the air tank of new energy vehicles is the core to ensure the long-term stable operation of the air tank.

[0003] Patent document CN213168042U discloses "a drainage device for an automotive air tank, comprising an air tank body, a drain outlet at the bottom of the air tank body, a connecting pipe sleeved on the drain outlet, a water tank sleeved at the end of the connecting pipe, and a sleeve at the lower end of the water tank." While it boasts advantages such as "automatic drainage, eliminating the need for the driver to crawl under the bus and manually pull the drain valve ring as in traditional methods, and allowing a small amount of water to remain in the water tank without affecting the air tank's use, and the snap-fit ​​connection between the water tank and air tank for easy disassembly during later replacement and maintenance," the device still presents challenges in the use of traditional air tanks. The existing drainage methods mainly rely on gravity drainage or electric and manual control valves. While these methods have some effect, they also have significant drawbacks. First, gravity drainage passively relies on the natural flow of water, which is inefficient and prone to water residue due to the structure or tilt angle of the air tank, increasing maintenance frequency. Second, while electric drainage devices can achieve a certain degree of automation, they require an additional power supply, which not only increases the energy consumption burden of new energy vehicles and does not conform to the concept of environmental protection, but also introduces the risk of circuit failure, which may cause safety problems in high-pressure environments. In addition, existing drainage mechanisms often ignore the issue of internal air pressure balance in the air tank. During the drainage process, negative pressure can easily form inside the tank, hindering the smooth discharge of water, while excessive pressurization lacks reliable protection and may cause equipment damage. Summary of the Invention

[0004] The main objective of this invention is to provide an automatic drainage device and method for air tanks in new energy vehicles, which can effectively solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An automatic drainage device for an air tank in a new energy vehicle includes an intake cylinder, a drainage shell, a sealing top cover, a drainage pipe, and a drainage connector. The intake cylinder is located on one side of the drainage shell. The sealing top cover is fixedly installed on the upper end of the drainage shell. The drainage pipe is fixedly installed on the upper end of the sealing top cover. The drainage connector is fixedly installed on the upper end of the sealing top cover. An exhaust port is integrally formed on the top of the intake cylinder. An exhaust connector is fixedly installed on the upper end of the exhaust port. An air guide pipe is welded to the upper end of the exhaust port through the exhaust connector. A worm gear fan is rotatably installed inside the intake cylinder. A drain pipe is fixedly installed on one side of the intake cylinder. A sealing mounting plate is fixedly installed. A transmission mounting base is fixedly installed on one side of the sealing mounting plate. A bearing sleeve is fixedly installed inside the transmission mounting base. A transmission connecting rod is movably installed inside the bearing sleeve. A drive conical wheel is fixedly installed at one end of the transmission connecting rod. A mating sleeve is fixedly installed on the opposite side of the transmission mounting base and the sealing mounting plate. A transmission housing is welded to the end of the mating sleeve away from the transmission mounting base. A transmission conical wheel is movably installed inside the transmission housing. A sealing connecting plate that is fixedly connected to the lower end of the drainage housing is fixedly installed at the upper end of the transmission housing. A drainage suction structure is fixedly installed inside the drainage housing.

[0007] Preferably, one side of the intake cylinder body has an integrally formed through intake port, which is located on one side of the worm gear fan.

[0008] Preferably, a water tank gas pipe connector is fixedly installed at the upper end of the gas guide pipe, a vent valve is fixedly installed on the outer side of the gas guide pipe, and a vent connector is fixedly installed at the lower end of the vent valve.

[0009] Preferably, the drainage pipe is connected to the interior of the drainage shell through a sealed top cover, and the drainage shell has an integrally formed drainage outlet on one side of its exterior.

[0010] Preferably, the lower end of the transmission mounting base is fixedly installed with a through oil guide joint, one end of the transmission connecting rod passes through the sealing mounting plate to the inside of the intake cylinder and is fixedly connected to the worm gear fan, and the other end of the transmission connecting rod passes through the docking sleeve to the inside of the transmission housing.

[0011] Preferably, the drive cone wheel is located inside the transmission housing and is meshed with the transmission cone wheel.

[0012] Preferably, the drainage suction structure includes a rotating connecting rod, a drainage suction hood, water suction blades, and a water guide pipe. The rotating connecting rod is movably installed at the center of the drainage housing, the drainage suction hood is fixedly installed on the upper inner wall of the drainage housing, the water suction blades are rotatably installed inside the drainage suction hood, and the water guide pipe is fixedly installed on the lower side of the drainage suction hood.

[0013] Preferably, the lower end of the rotating connecting rod passes through the sealing connecting plate to the inner wall of the transmission housing and is fixedly connected to the upper end of the transmission cone wheel, and the upper end of the rotating connecting rod passes through the drainage suction hood and is fixedly connected to the lower end of the water suction blade.

[0014] Preferably, the upper end of the drainage suction hood is connected to the interior of the drainage pipe through a sealed top cover, and the water-absorbing blades are located below the drainage pipe.

[0015] An automatic drainage method for an automatic drainage device used in the air tank of new energy vehicles, the method specifically includes the following steps:

[0016] Step 1: The air inlet is connected to the car's air intake, the drain connector at the top of the drain pipe is installed at the drain outlet of the air tank, and the water tank air pipe connector at the top of the air guide pipe is connected to the inside of the air tank to achieve the overall installation of the device.

[0017] Step 2: Air enters the intake cylinder through the intake pipe, and the air blows the worm gear fan to rotate. The worm gear fan drives the transmission connecting rod to rotate, which in turn causes the drive cone wheel at one end of the transmission connecting rod to rotate. The drive cone wheel then meshes with the transmission cone wheel to drive the rotating connecting rod to rotate, and the rotating connecting rod drives the water suction blades inside the drainage suction hood to rotate.

[0018] Step 3: When the water-absorbing blades rotate, they generate suction, which draws water from the bottom of the air storage cylinder through the drain pipe. The water then flows through the drain suction hood and the water guide pipe into the drain housing for temporary storage, and is finally discharged through the drain outlet.

[0019] Step 4: The air after the worm gear fan rotates flows through the intake cylinder to the exhaust port and is then discharged. It is then fed into the air storage tank through the air guide pipe. After the air enters the air storage tank, the internal air pressure increases. When the water is drained through the water suction blades in the drain pipe, the increased air pressure in the air storage tank improves the water discharge efficiency and prevents water from being unable to be discharged due to negative pressure. When the air pressure in the air storage tank is too high, the air in the air guide pipe cannot enter the tank and is discharged through the vent valve.

[0020] The beneficial effects that can be achieved by the above embodiments of the present invention include: using the wind power generated during the operation of new energy vehicles as a power source, without the need for additional electricity or external energy, the drainage process is fully automated. The air inlet is connected to the air intake of the car, and the air blows the worm gear fan to rotate, thereby driving the entire drainage mechanism. This not only reduces energy consumption, but also conforms to the environmental protection concept of new energy vehicles and reduces maintenance costs.

[0021] With its designed drainage and suction structure, the suction blades rotate under the drive of the rotating connecting rod, generating strong suction. This allows the water accumulated at the bottom of the air storage tank to be quickly drawn in through the drainage pipe. Compared to traditional gravity drainage or passive valve-controlled drainage, the rotary suction method is more efficient. When the suction blades rotate, they create a negative pressure area that acts directly on the drain outlet of the air storage tank, actively extracting accumulated water and preventing water residue. When the drainage process stops, the suction blades are stationary, which acts as a seal to prevent water backflow or the entry of external contaminants, thus extending the life of the device.

[0022] The air generated by the rotating worm gear fan is introduced into the air storage tank through the air guide pipe, increasing the internal air pressure of the air storage tank and assisting the drainage process. This effectively prevents drainage difficulties caused by negative pressure in the air storage tank, improving drainage efficiency and reliability. At the same time, the air guide pipe is equipped with a vent valve and a vent connector. When the air pressure in the air storage tank is too high, it will automatically vent and discharge, avoiding equipment damage or safety hazards caused by pressure accumulation. This ensures the stability and safety of the device during long-term operation, and is particularly suitable for the high-pressure environment of new energy vehicles.

[0023] This invention achieves automation, efficiency, and safety in air tank drainage through innovations such as wind power drive, air pressure assistance, and overpressure protection. It is applicable to a wide range of new energy vehicle applications and has significant economic and practical benefits. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an automatic drainage device for an air tank in a new energy vehicle according to the present invention.

[0025] Figure 2 This is a rear view of an automatic drainage device for an air tank in a new energy vehicle according to the present invention.

[0026] Figure 3 This is an exploded view of the exhaust connector in an automatic drainage device for an air tank in a new energy vehicle according to the present invention.

[0027] Figure 4 This is a cross-sectional view of the transmission housing and the drainage housing in an automatic drainage device for an air tank of a new energy vehicle according to the present invention.

[0028] Figure 5 This is a cross-sectional view of the intake cylinder in an automatic drainage device for an air tank in a new energy vehicle according to the present invention.

[0029] Figure 6 This is an enlarged view of the drainage suction structure in an automatic drainage device for an air tank in a new energy vehicle according to the present invention.

[0030] In the diagram: 1. Intake cylinder block; 2. Exhaust port; 3. Worm gear fan; 4. Exhaust connector; 5. Air guide pipe; 6. Water tank air pipe connector; 7. Vent valve; 8. Vent connector; 9. Sealing mounting plate; 10. Transmission mounting base; 11. Oil guide connector; 12. Bearing sleeve; 13. Transmission connecting rod; 14. Drive cone wheel; 15. Connecting sleeve; 16. Transmission housing; 17. Transmission cone wheel; 18. Sealing connecting plate; 19. Drainage housing; 20. Sealing top cover; 21. Drain port; 22. Drainage suction structure; 23. Rotating connecting rod; 24. Drainage suction hood; 25. Water suction blade; 26. Water guide pipe; 27. Drainage pipe; 28. Drainage connector; 29. ​​Intake port. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0032] like Figures 1-6 As shown, an automatic drainage device for an air tank in a new energy vehicle includes an intake cylinder 1, a drainage shell 19, a sealing top cover 20, a drainage pipe 27, and a drainage connector 28. The intake cylinder 1 is located on one side of the drainage shell 19. The sealing top cover 20 is fixedly installed on the upper end of the drainage shell 19. The drainage pipe 27 is fixedly installed on the upper end of the sealing top cover 20. The drainage connector 28 is fixedly installed on the upper end of the sealing top cover 20. An exhaust port 2 is integrally formed on the top of the intake cylinder 1. An exhaust connector 4 is fixedly installed on the upper end of the exhaust port 2. An air guide pipe 5 is welded to the upper end of the exhaust port 2 through the exhaust connector 4. A worm gear fan 3 is rotatably installed inside the intake cylinder 1. A worm gear fan 3 is fixedly installed on one side of the intake cylinder 1. A sealing mounting plate 9 is provided. A transmission mounting base 10 is fixedly installed on one side of the sealing mounting plate 9. A bearing sleeve 12 is fixedly installed inside the transmission mounting base 10. A transmission connecting rod 13 is movably installed inside the bearing sleeve 12. A drive cone wheel 14 is fixedly installed at one end of the transmission connecting rod 13. A mating sleeve 15 is fixedly installed on the opposite side of the transmission mounting base 10 and the sealing mounting plate 9. A transmission housing 16 is welded to the end of the mating sleeve 15 away from the transmission mounting base 10. A transmission cone wheel 17 is movably installed inside the transmission housing 16. A sealing connecting plate 18, which is fixedly connected to the lower end of the drainage housing 19, is fixedly installed at the upper end of the transmission housing 16. A drainage suction structure 22 is fixedly installed inside the drainage housing 19.

[0033] In this embodiment, an intake port 29 is integrally formed on one side of the intake cylinder 1, and the intake port 29 is located on one side of the worm gear fan 3.

[0034] Specifically, the air intake port 29 is used to connect to the car's air intake pipe, so that the air generated by the car's operation can be input into the air intake port 29 to blow the worm gear fan 3 as a power source.

[0035] In this embodiment, a water tank gas pipe connector 6 is fixedly installed at the upper end of the gas duct 5, a vent valve 7 is fixedly installed on the outer side of the gas duct 5, and a vent connector 8 is fixedly installed at the lower end of the vent valve 7.

[0036] Specifically, the vent valve 7 is set with an upper limit on air pressure. When air cannot enter the air storage cylinder in the air guide pipe 5 and the air pressure is too high, the air is discharged through the vent valve 7 and the vent connector 8.

[0037] In this embodiment, the drainage pipe 27 is connected to the interior of the drainage housing 19 through the sealing top cover 20, and the drainage housing 19 has an integrally formed drainage port 21 on the outer side.

[0038] In this embodiment, a through-hole oil guide connector 11 is fixedly installed at the lower end of the transmission mounting base 10, one end of the transmission connecting rod 13 passes through the sealing mounting plate 9 to the inside of the intake cylinder body 1 and is fixedly connected to the worm gear fan 3, and the other end of the transmission connecting rod 13 passes through the docking sleeve 15 to the inside of the transmission housing 16.

[0039] In this embodiment, the drive cone wheel 14 is located inside the transmission housing 16 and is engaged with the transmission cone wheel 17.

[0040] Specifically, the transmission connecting rod 13 rotates inside the bearing sleeve 12, and the oil guide joint 11 injects lubricating oil into the bearing sleeve 12 inside the transmission mounting seat 10. The rotation of the worm gear fan 3 drives the drive cone wheel 14 to rotate through the transmission connecting rod 13, thereby achieving synchronous transmission to the transmission cone wheel 17.

[0041] In this embodiment, the drainage suction structure 22 includes a rotating connecting rod 23, a drainage suction hood 24, a water suction blade 25, and a water guide pipe 26. The rotating connecting rod 23 is movably installed at the center of the drainage housing 19, the drainage suction hood 24 is fixedly installed on the upper inner wall of the drainage housing 19, the water suction blade 25 is rotatably installed inside the drainage suction hood 24, and the water guide pipe 26 is fixedly installed on the lower side of the drainage suction hood 24.

[0042] In this embodiment, the lower end of the rotating connecting rod 23 passes through the sealing connecting plate 18 to the inner wall of the transmission housing 16 and is fixedly connected to the upper end of the transmission cone wheel 17. The upper end of the rotating connecting rod 23 passes into the drainage suction hood 24 and is fixedly connected to the lower end of the water suction blade 25.

[0043] In this embodiment, the upper end of the drain suction hood 24 is connected to the interior of the drain pipe 27 through the sealing top cover 20, and the water suction blade 25 is located below the drain pipe 27.

[0044] Specifically, the transmission cone wheel 17 drives the water suction blade 25 to rotate via the rotating connecting rod 23. When the water suction blade 25 is in a stopped state, it seals the drainage pipe 27. When the water suction blade 25 rotates, it draws water from the air storage tank through the drainage pipe 27 and guides it to the water guide pipe 26.

[0045] It should be noted that this invention is an automatic drainage device and method for an air tank in a new energy vehicle. In use, the air inlet 29 is connected to the vehicle's air intake, the drain connector 28 at the upper end of the drain pipe 27 is installed at the drain outlet of the air tank, and the water tank air pipe connector 6 at the upper end of the air guide pipe 5 is connected to the inside of the air tank to achieve overall installation of the device. When the vehicle issues a drainage command, the air generated by the vehicle's movement is directed to the air inlet 29, and air enters the intake cylinder 1. The air blows the worm gear fan 3 to rotate, which in turn drives the transmission connecting rod 13 to rotate. This ultimately causes the drive cone wheel 14 at one end of the transmission connecting rod 13 to rotate. The drive cone wheel 14 then meshes with the transmission cone wheel 17 to drive the rotating connecting rod 23 to rotate. The rotating connecting rod 23 then drives the suction in the drainage suction hood 24. The water blade 25 rotates, generating suction to draw water from the bottom of the air tank through the drain pipe 27. The water then flows through the drain suction hood 24 and the water guide pipe 26 into the drain housing 19 for temporary storage. Finally, the water is discharged through the drain outlet 21. The air tank is automatically drained by utilizing the wind power generated by the car's operation. The air after the worm gear fan 3 rotates flows through the intake cylinder 1 to the exhaust outlet 2 and then enters the air tank through the air guide pipe 5. The air entering the air tank increases its internal pressure. When the water is drained through the drain pipe 27 and the water blade 25, the increased pressure in the air tank improves the water discharge efficiency, achieving pressurization during drainage and preventing negative pressure from preventing water from being discharged. If the air pressure in the air tank is too high, the air in the air guide pipe 5 cannot enter and is discharged through the vent valve 7.

[0046] In the embodiments provided by this invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and other division methods may exist in actual implementation. Modules described as separate components may or may not be physically separated, and components shown as modules may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of the method in this embodiment according to actual needs.

[0047] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. An automatic drainage device for an air tank in a new energy vehicle, comprising an intake cylinder (1), a drainage shell (19), a sealing top cover (20), a drainage pipe (27), and a drainage connector (28), wherein the intake cylinder (1) is located on one side of the drainage shell (19), the sealing top cover (20) is fixedly installed on the upper end of the drainage shell (19), the drainage pipe (27) is fixedly installed on the upper end of the sealing top cover (20), and the drainage connector (28) is fixedly installed on the upper end of the sealing top cover (20), characterized in that: The top of the intake cylinder (1) is integrally formed with an exhaust port (2). An exhaust connector (4) is fixedly installed at the upper end of the exhaust port (2). An air guide pipe (5) is welded to the upper end of the exhaust port (2) through the exhaust connector (4). A worm gear fan (3) is rotatably installed inside the intake cylinder (1). A sealing mounting plate (9) is fixedly installed on one side of the intake cylinder (1). A transmission mounting seat (10) is fixedly installed on one side of the sealing mounting plate (9). A bearing sleeve (12) is fixedly installed inside the transmission mounting seat (10). A transmission is movably installed inside the bearing sleeve (12). A connecting rod (13) is fixedly mounted with a drive cone wheel (14) at one end. A mating sleeve (15) is fixedly mounted on the opposite side of the transmission mounting seat (10) and the sealing mounting plate (9). A transmission housing (16) is welded to the end of the mating sleeve (15) away from the transmission mounting seat (10). A transmission cone wheel (17) is movably mounted inside the transmission housing (16). A sealing connecting plate (18) is fixedly mounted on the upper end of the transmission housing (16) and fixedly connected to the lower end of the drainage housing (19). A drainage suction structure (22) is fixedly mounted inside the drainage housing (19).

2. The automatic drainage device for an air storage tank in a new energy vehicle according to claim 1, characterized in that: The intake cylinder block (1) has an integrally formed intake port (29) on one side, and the intake port (29) is located on one side of the worm gear fan (3).

3. An automatic drainage device for an air storage tank in a new energy vehicle according to claim 1, characterized in that: The upper end of the air duct (5) is fixedly installed with a water tank air pipe connector (6), the outer side of the air duct (5) is fixedly installed with a vent valve (7), and the lower end of the vent valve (7) is fixedly installed with a vent connector (8).

4. An automatic drainage device for an air storage tank in a new energy vehicle according to claim 1, characterized in that: The drainage pipe (27) is connected to the interior of the drainage shell (19) through the sealing top cover (20), and the drainage shell (19) has an integrally formed drainage port (21) on the outer side.

5. An automatic drainage device for an air storage tank in a new energy vehicle according to claim 1, characterized in that: The lower end of the transmission mounting base (10) is fixedly installed with a through oil guide joint (11). One end of the transmission connecting rod (13) passes through the sealing mounting plate (9) to the inside of the intake cylinder (1) and is fixedly connected to the worm gear fan (3). The other end of the transmission connecting rod (13) passes through the docking sleeve (15) to the inside of the transmission housing (16).

6. An automatic drainage device for an air tank in a new energy vehicle according to claim 1, characterized in that: The drive cone wheel (14) is located inside the transmission housing (16) and is engaged with the transmission cone wheel (17).

7. An automatic drainage device for an air storage tank in a new energy vehicle according to claim 1, characterized in that: The drainage suction structure (22) includes a rotating connecting rod (23), a drainage suction hood (24), a water suction blade (25), and a water guide pipe (26). The rotating connecting rod (23) is movably installed in the center of the drainage housing (19). The drainage suction hood (24) is fixedly installed on the upper inner wall of the drainage housing (19). The water suction blade (25) is rotatably installed inside the drainage suction hood (24). The water guide pipe (26) is fixedly installed on the lower side of the drainage suction hood (24).

8. An automatic drainage device for an air tank in a new energy vehicle according to claim 7, characterized in that: The lower end of the rotating connecting rod (23) passes through the sealing connecting plate (18) to the inner wall of the transmission housing (16) and is fixedly connected to the upper end of the transmission cone wheel (17). The upper end of the rotating connecting rod (23) passes into the drainage suction hood (24) and is fixedly connected to the lower end of the water suction blade (25).

9. An automatic drainage device for an air tank in a new energy vehicle according to claim 7, characterized in that: The upper end of the drainage suction hood (24) is connected to the interior of the drainage pipe (27) through the sealing top cover (20), and the water suction blade (25) is located below the drainage pipe (27).

10. An automatic drainage method for an automatic drainage device for an air tank in a new energy vehicle, as described in any one of claims 1-9, characterized in that, The method specifically includes the following steps: Step 1: The air inlet (29) is connected to the car's air inlet, the drain connector (28) at the upper end of the drain pipe (27) is installed at the drain outlet of the air tank, and the water tank air pipe connector (6) at the upper end of the air guide pipe (5) is connected to the inside of the air tank to realize the overall installation of the device; Step 2: Air enters the intake cylinder (1) through the intake port (29). The air blows the worm gear fan (3) to rotate. The worm gear fan (3) drives the transmission connecting rod (13) to rotate. Finally, the drive cone wheel (14) at one end of the transmission connecting rod (13) rotates. Then, the drive cone wheel (14) is connected to the transmission cone wheel (17) to drive the rotating connecting rod (23) to rotate. The rotating connecting rod (23) drives the water suction blade (25) in the drainage suction hood (24) to rotate. Step 3: When the water-absorbing blade (25) rotates, it generates suction force, which draws water from the bottom of the air storage cylinder through the drain pipe (27). The water then flows through the drain suction hood (24) and the water guide pipe (26) into the drain housing (19) to achieve temporary storage. Finally, the water is discharged through the drain pipe (21). Step 4: The air after the worm gear fan (3) rotates flows through the intake cylinder (1) to the exhaust port (2) and is then discharged. It is then input into the air storage tank through the air guide pipe (5). After the air enters the air storage tank, the internal air pressure increases. When the water is drained through the water suction blade (25) in the drain pipe (27), the increased air pressure in the air storage tank improves the water discharge efficiency and prevents the water from being unable to be discharged due to negative pressure. When the air pressure in the air storage tank is too high, the air in the air guide pipe (5) cannot enter it and is discharged through the vent valve (7).

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