Power surfboard

Abstract

The utility model discloses a powered surfboard which comprises a shell (1), an engine (2) and an air inlet pipe (3). The isolation plate (4) is located in the containing cavity (11) and is annular, the upper end of the isolation plate (4) is connected with the inner surface of the top wall (12), the lower end of the isolation plate (4) is connected with the inner surface of the bottom wall (13), and the isolation plate (4), the top wall (12) and the bottom wall (13) define a mounting cavity (42) for mounting the engine (2); the isolation plate (4) is provided with a through hole (41) penetrating through the wall thickness; the air inlet pipe (3) is located outside the installation cavity (42), and an air inlet hole of the air inlet pipe (3), the through hole (41) of the isolation plate (4) and an air inlet of the engine (2) are communicated. And by arranging the isolation plate, the air inlet and waterproof requirements of the engine can be met at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of surfboards, in particular to a power surfboard. Background Art

[0002] The power surfboard is used for a person to ride on the water surface and generally floats on the water surface. For example, the "Power Surfboard with Improved Gasoline Engine" disclosed in the Chinese invention application with the publication number CN101927817A. The power surfboard includes an engine, and the engine needs sufficient air supply to operate normally. During normal riding, the power surfboard may sink into the water for several seconds, or due to the unskilled operation of the user and the influence of waves, the power surfboard may also roll or overturn up and down under the water surface. At this time, water may leak into the engine, causing engine damage.

[0003] Therefore, it is required that the power surfboard needs to balance the air intake and waterproof requirements of the engine. Specifically, during normal use (the top wall of the power surfboard shell is on the top and the bottom wall of the shell is on the bottom), the engine can still obtain sufficient air within several seconds of sinking into the water to keep the engine running normally. Another requirement is that when the surfboard rolls or overturns under the water surface out of the user's control (the top wall of the power surfboard shell is on the bottom and the bottom wall is on the top), water is prevented from seeping into the engine compartment, thereby avoiding water entering the engine and causing engine damage.

[0004] In addition, the engine of the power surfboard relies on the fuel tank to provide fuel and relies on the ECU (Electronic Control Unit) and the battery to supply power and control the ignition of the engine. Currently, the fuel tank, ECU, and battery are often located in the same compartment as the engine, and the temperature of the engine is relatively high, resulting in a relatively high temperature of the fuel tank, ECU, and battery, having a potential fire hazard and low safety. Summary of the Utility Model

[0005] The first technical problem to be solved by the utility model is to provide a power surfboard that can balance the air intake and waterproof requirements of the engine according to the current situation of the prior art.

[0006] The second technical problem to be solved by the utility model is to provide a power surfboard with relatively high safety according to the current situation of the prior art.

[0007] The technical solution adopted by the utility model to solve the above first technical problem is as follows: A power surfboard, characterized in that it includes

[0008] a housing having an accommodation cavity, and the cavity wall of the accommodation cavity includes a top wall and a bottom wall spaced from the top wall;

[0009] an engine disposed in the accommodation cavity;

[0010] An intake pipe is provided on the outer shell and extends out of the top wall of the outer shell. The intake pipe has an air inlet hole for allowing external air to enter the accommodation cavity.

[0011] It is characterized in that: it further includes

[0012] An isolation plate, which is located in the accommodation cavity and is annular. The upper end of the isolation plate is connected to the inner surface of the top wall, and the lower end is connected to the inner surface of the bottom wall. The isolation plate and the top wall and the bottom wall enclose an installation cavity for installing the engine; the isolation plate has a through hole penetrating the wall thickness.

[0013] The intake pipe is located outside the installation cavity, and the air inlet hole of the intake pipe, the through hole of the isolation plate, and the air inlet of the engine are connected and communicated.

[0014] For water and gas separation, a waterproof cover covering the through hole is provided outside the isolation plate. The waterproof cover has a perforation penetrating its own wall thickness. When the outer shell is in the normal state with the top wall on top, the position of the perforation is higher than the position of the through hole.

[0015] The air inlet hole of the intake pipe, the perforation, and the through hole are connected and communicated.

[0016] In this way, air enters the air inlet of the engine through the air inlet hole of the intake pipe, the accommodation cavity, the perforation, and the through hole. When the outer shell is in the normal state with the top wall on top, the position of the perforation is relatively high, and water is not easily able to cross the perforation and enter the engine, thus achieving water and gas separation.

[0017] For waterproofing, a waterproof cover for opening or closing the perforation is rotatably provided outside the perforation. The lower end of the waterproof cover is rotatably connected to the isolation plate, and the upper end of the waterproof cover is a free end.

[0018] When the outer shell is in the normal state with the top wall on top, the waterproof cover is in the state of opening the perforation.

[0019] When the outer shell is in the overturned state with the bottom wall on top, the waterproof cover is in the state of closing the perforation.

[0020] In this way, when the outer shell is in the normal state with the top wall on top, the waterproof cover flips downward to open the perforation, and air enters the air inlet of the engine through the air inlet hole of the intake pipe, the accommodation cavity, the perforation, and the through hole. Water is not easily able to cross the perforation and enter the engine, thus achieving water and gas separation.

[0021] When the outer shell is in the overturned state with the bottom wall on top, there may be a situation where the engine has not stopped and is still sucking air. The waterproof cover closes the perforation, and the water flow is blocked outside the waterproof cover, thus preventing water from being sucked into the engine.

[0022] For water-gas separation, an air filter for water-gas separation is further provided in the installation cavity at the air inlet of the engine; the air filter has a hollow inner cavity, a side air inlet, a side air outlet, and a bottom drain port that are respectively communicated with the hollow inner cavity. A U-shaped water guide edge surrounding the side air outlet is provided in the cavity wall of the hollow inner cavity, and the U-shaped water guide edge opens in a direction away from the side air inlet;

[0023] The side air outlet is docked with the air inlet of the engine;

[0024] When the outer shell is in the normal state with the top wall on top, the position of the bottom drain port is lower than the U-shaped water guide edge.

[0025] In this way, after the water entering the installation cavity enters the air filter, under the action of the U-shaped water guide edge and centrifugal force, it drains downward from the bottom drain port and will not enter the engine through the side air inlet, thus realizing water-gas separation.

[0026] To improve the waterproof effect, it further includes

[0027] A water guide plate is arranged in the accommodation cavity and is located between the intake pipe and the partition plate. The upper end of the water guide plate is connected to the inner surface of the top wall, and the lower end is connected to the inner surface of the bottom wall;

[0028] The water guide plate is C-shaped and opens towards the partition plate, and the through hole of the partition plate is opposite to the opening of the C-shaped;

[0029] Taking the forward direction of the power surfboard as the front-back direction and the width direction of the power surfboard as the left-right direction, the two ends of the C-shaped are located outside the partition plate and overlap with the partition plate in the left-right direction; there are gaps between the left and right sides of the water guide plate and the inner cavity wall of the accommodation cavity.

[0030] In this way, the water flowing in from the intake pipe is guided to the left and right sides and the rear part of the partition plate under the action of the water guide plate. The water flow is not easy to reach the through hole and is not easy to enter the installation cavity and is not easy to enter the engine; at the same time, the air flowing in from the intake pipe can smoothly enter the engine; setting the water guide plate is beneficial to increasing the strength of the power surfboard.

[0031] To further solve the second technical problem of the present application, preferably, a control module electrically connected to the engine and a fuel tank connected to the engine are spaced apart in the space defined by the water guide plate, and the control module and the fuel tank are located outside the installation cavity.

[0032] In this way, the control module and the fuel tank are in different chambers from the engine. The control module and the fuel tank are not easily affected by the high temperature of the engine working and will not catch fire, and the safety is relatively high. To facilitate the installation and maintenance of the engine, a first opening is provided in the top wall of the outer shell directly above the engine, and a first door panel capable of opening or sealing and closing the first opening is provided at the first opening.

[0033] To facilitate the installation and maintenance of the fuel tank, a second opening is provided in the top wall of the housing directly above the fuel tank, and a second door panel capable of opening or sealing and closing the second opening is provided at the second opening.

[0034] To facilitate the installation and maintenance of the control module, the control module includes a waterproof box, a battery and an electronic controller unit which are arranged in the waterproof box and are both electrically connected to the engine;

[0035] A third opening is provided in the top wall of the housing, and the waterproof box is installed at the third opening and is in sealing cooperation with the wall of the third opening, and the surface of the waterproof box is flush with the outer surface of the top wall.

[0036] To further prevent water from entering the engine, a first drainage pump and a first drainage pipe are arranged in the installation cavity, the top wall has a drainage hole located outside the first door panel, and two ends of the first drainage pipe are respectively communicated with the first drainage pump and the drainage hole.

[0037] In this way, the first drainage pump discharges the water in the installation cavity to the outside of the housing through the first drainage pipe and the drainage hole, and it is not easy for water to enter the engine.

[0038] Compared with the prior art, the advantages of the present utility model are as follows: by providing an annular isolation plate, when the power surfboard enters water, after the water flows into the accommodation cavity through the air inlet pipe, it is blocked by the isolation plate, and it is not easy for the water to enter the engine. At the same time, air can also enter the engine through the through holes on the isolation plate, which is beneficial for the engine to continue running for a certain period of time. In this way, the air intake and waterproof requirements of the engine can be taken into account simultaneously. Description of the Drawings

[0039] Figure 1 Schematic diagram of the power surfboard in the normal driving state according to the embodiment of the present utility model;

[0040] Figure 2 For Figure 1 Exploded view of the power surfboard;

[0041] Figure 3 For Figure 1 Another exploded view of the power surfboard;

[0042] Figure 4 Partial schematic diagram of the power surfboard according to the embodiment of the present utility model;

[0043] Figure 5 Assembly schematic diagram of the isolation plate, waterproof cover and waterproof lid according to the embodiment of the present utility model (the waterproof lid is in the state of opening the perforation);

[0044] Figure 6 For Figure 5 Cross-sectional view;

[0045] Figure 7 This is a schematic diagram of the power surfboard in the overturned state according to an embodiment of the present utility model;

[0046] Figure 8 is Figure 7 an exploded view of the power surfboard;

[0047] Figure 9 is Figure 8 a schematic diagram of another angle of the power surfboard;

[0048] Figure 10 This is an assembly schematic diagram of another state of the isolation plate, waterproof cover, and waterproof lid according to an embodiment of the present utility model (the waterproof lid is in the state of closing the perforation);

[0049] Figure 11 is Figure 10 a sectional view of;

[0050] Figure 12 This is a schematic diagram of the air filter according to an embodiment of the present utility model;

[0051] Figure 13 is Figure 12 a schematic diagram of another angle of the air filter;

[0052] Figure 14 is Figure 12 a sectional view of the air filter. Detailed implementation manners

[0053] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0054] Refer to Figures 1 to 14 , which is a preferred embodiment of the present utility model. The power surfboard includes a housing 1, an engine 2, an air intake pipe 3, an isolation plate 4, a waterproof cover 5, a waterproof lid 6, an air filter 100, a water guide plate 7, etc.

[0055] Among them, the housing 1 has a receiving cavity 11, and the cavity wall of the receiving cavity 11 includes a top wall 12 and a bottom wall 13 spaced from the top wall 12; a first opening 14 is provided in the top wall 12 of the housing 1 directly above the engine 2, and a first door panel 15 capable of opening or sealing and closing the first opening 14 is provided at the first opening 14. A sealing ring is provided between the first door panel 15 and the first opening 14, and then the first door panel 15 is detachably fixed to the housing 1 by screws.

[0056] The engine 2 is arranged in the receiving cavity 11.

[0057] The air intake pipe 3 is arranged on the housing 1 and extends out of the top wall 12 of the housing 1. The air intake pipe 3 has an air intake hole for allowing external air to enter the receiving cavity 11.

[0058] The partition plate 4 is located within the accommodation cavity 11 and is annular. The upper end of the partition plate 4 is connected to the inner surface of the top wall 12, and the lower end is connected to the inner surface of the bottom wall 13. The partition plate 4 and the top wall 12 and the bottom wall 13 enclose an installation cavity 42 for installing the engine 2; the partition plate 4 has a through-hole 41 penetrating the wall thickness. The intake pipe 3 is located outside the installation cavity 42, and the intake hole of the intake pipe 3, the through-hole 41 of the partition plate 4, and the intake port of the engine 2 are in communication.

[0059] The waterproof cover 5 is arranged outside the partition plate 4 and covers the through-hole 41. The waterproof cover 5 has a perforation 51 penetrating its own wall thickness. When the housing 1 is in the normal state with the top wall 12 on top, the position of the perforation 51 is higher than the position of the through-hole 41; the intake hole of the intake pipe 3, the perforation 51, and the through-hole 41 are in communication.

[0060] The waterproof lid 6 is rotatably arranged outside the perforation 51 and is used to open or close the perforation 51. Figure 4 Viewed from [position], the lower end of the waterproof lid 6 is rotatably connected to the partition plate 4, and the upper end of the waterproof lid 6 is a free end; when the housing 1 is in the normal state with the top wall 12 on top, the waterproof lid 6 is in the state of opening the perforation 51 ( Figure 4 ); when the housing 1 is in the overturned state with the bottom wall 13 on top, the waterproof lid 6 is in the state of closing the perforation 51 ( Figure 9 ).

[0061] Refer to Figure 3 、 Figure 8 , the air filter 100 is arranged in the installation cavity 42 and is located at the intake port of the engine 2. The air filter 100 is used for water-vapor separation. Refer to Figures 12 to 14 , the air filter 100 has a hollow inner cavity 100a, a side intake port 100b, a side outlet port 100c, and a bottom drain port 100d that are respectively in communication with the hollow inner cavity 100a. The inner wall of the cavity of the hollow inner cavity 100a has a U-shaped water guide edge 100e surrounding the side outlet port 100c. The U-shaped water guide edge 100e opens in a direction away from the side intake port 100b; the side outlet port 100c is docked with the intake port of the engine 2; when the housing 1 is in the normal state with the top wall 12 on top, the position of the bottom drain port 100d is lower than the U-shaped water guide edge 100e (i.e., Figure 14 shown).

[0062] The water guide plate 7 is arranged in the accommodation cavity 11 and is located between the intake pipe 3 and the partition plate 4. The upper end of the water guide plate 7 is connected to the inner surface of the top wall 12, and the lower end is connected to the inner surface of the bottom wall 13. The water guide plate 7 is in a C shape with an opening facing the partition plate 4, and the through hole 41 of the partition plate 4 is opposite to the opening of the C shape. Taking the forward direction of the power surfboard as the front-back direction and the width direction of the power surfboard as the left-right direction, the two ends of the C shape are located outside the partition plate 4 and overlap with the partition plate 4 in the left-right direction. There are gaps between the left and right sides of the water guide plate 7 and the inner cavity wall of the accommodation cavity 11, so that the air passage from the intake pipe 3 to the through hole 41 of the partition plate 4 is unobstructed.

[0063] A control module 8 electrically connected to the engine 2 and a fuel tank 9 connected to the engine 2 are arranged at intervals in the space defined by the water guide plate 7, and the control module 8 and the fuel tank 9 are located outside the installation cavity 42. A second opening 16 is formed in the top wall 12 of the housing 1 directly above the fuel tank 9. A second door panel 17 capable of opening or sealing and closing the second opening 16 is arranged at the second opening 16. A sealing ring is arranged between the second door panel 17 and the second opening 16, and then the second door panel 17 is detachably fixed to the housing 1 by screws.

[0064] The control module 8 includes a waterproof box, a battery and an electronic controller unit arranged in the waterproof box and both electrically connected to the engine 2. A third opening 18 is formed in the top wall 12 of the housing 1, and the waterproof box is installed at the third opening 18 and is in sealing cooperation with the wall of the third opening 18. For example, the sealing cooperation is achieved by arranging a sealing ring. The surface of the waterproof box is flush with the outer surface of the top wall 12, and the waterproof box and the housing 1 are detachably fixed by screws.

[0065] In order to drain the accumulated water in the installation cavity 42 out of the housing 1, a first drainage pump (not shown in the figure) and a first drainage pipe (not shown in the figure) are arranged in the installation cavity 42. The top wall 12 has a drainage hole 19 located outside the first door panel 15 (see Figures 1 to 3 ), and the two ends of the first drainage pipe are respectively communicated with the first drainage pump and the drainage hole 19. The first drainage pump is used to drain the water in the installation cavity 42 out of the housing 1 through the first drainage pipe and the drainage hole 19. In order to drain the accumulated water behind the partition plate 4 and outside the partition plate 4 out of the housing 1, a second drainage pump (not shown in the figure) and a second drainage pipe (not shown in the figure) are arranged at the tail of the power surfboard. The second drainage pump is located outside the partition plate 4 and below the exhaust pipe 200. One end of the second drainage pipe is communicated with the second drainage pump, and the other end is communicated with the outside. After the second drainage pipe passes through the partition plate 4 and penetrates into the installation cavity 42, it then penetrates out of the installation cavity 42. The second drainage pipe is in a U shape with an opening facing the exhaust pipe, so as to avoid spatial interference between the second drainage pipe and the exhaust pipe 200.

[0066] The working principle and usage method are as follows.

[0067] See also Figures 1 to 6 In a normal state, the waterproof cover 6 is in a state of opening the perforation 51. After the air enters the accommodating chamber 11 through the air intake pipe 3, it passes through the perforation 51, the through hole 41, the mounting chamber 42, the side air inlet 100b of the air filter 100, the hollow inner chamber 100a, and the side air outlet 100c to reach the air inlet of the engine 2 to provide oxygen for the operation of the engine 2. Figure 6 The arrow in shows the path of air from the accommodating cavity 11 into the mounting cavity 42 .

[0068] If the power surfboard sinks into the water for several seconds (at this time the power surfboard has not turned upside down, the top wall 12 is still on the top and the bottom wall 13 is on the bottom) and there is some water in the air intake pipe 3, the incoming water flow is discharged to the left and right sides of the isolation plate 4 under the action of the water guide plate 7. The isolation plate 4 plays a role in isolating the water flow, and the water flow is not easy to enter the installation cavity 42 surrounded by the isolation plate 4 and will not enter the engine 2; in addition, the position of the perforation 51 is relatively high (at this time the position of the perforation 51 is higher than the through hole 41), and it can block the water flow at a higher water level; when the water level continues to rise to pass through the perforation 51 and enter the hollow inner cavity 100a from the side air inlet 100b of the air filter 100, the water flow is subjected to a certain centrifugal effect under the action of the U-shaped water guide edge 100e and falls, and is discharged from the bottom surface drainage port 100d of the air filter 100; the water entering the installation cavity 42 is discharged to the outside of the housing 1 through the first drainage pump and the first drainage pipe through the drainage hole 19.

[0069] See also Figures 7 to 11 If the power surfboard is turned upside down (the top wall 12 is at the bottom and the bottom wall 13 is at the top), after the water flows in from the air inlet pipe 3, the water flows in are discharged to the left and right sides of the isolation plate 4 under the action of the water guide plate 7. The isolation plate 4 plays the role of isolating the water flow, and the water flow is not easy to enter the installation cavity 42 surrounded by the isolation plate 4 and will not enter the engine 2; in addition, when the power surfboard is turned upside down, under the action of gravity, the waterproof cover 6 is in a state of closing the perforation 51. At this time, the engine 2 may not be turned off and still sucking air. The waterproof cover closes the perforation 51, and the water flow is blocked outside the waterproof cover, which can prevent water from being sucked into the engine 2; even if a small amount of water enters the perforation 51, the perforation 51 is still a certain height away from the through hole 41 (after the power surfboard is turned upside down, the position of the through hole 41 is higher than the perforation 51), and the water flow can continue to be blocked. In this way, the water flow entering the engine 2 can be reduced or limited within a certain period of time.

[0070] In addition, the battery, electronic controller unit, fuel tank 9 and engine 2 are located in different chambers and are not easily affected by the high temperature of the engine 2. The fuel and batteries in the fuel tank 9 are in a safe and normal temperature environment and will not catch fire, so the safety is relatively high.

Claims

1. A powered surfboard, characterized in that: Comprising a housing (1) having a receiving cavity (11), the cavity wall of the receiving cavity (11) including a top wall (12) and a bottom wall (13) spaced from the top wall (12); an engine (2) disposed within the receiving cavity (11); an intake pipe (3) disposed on the housing (1) and protruding from the top wall (12) of the housing (1), the intake pipe (3) having an intake hole for allowing external air to enter the receiving cavity (11); It is characterized in that: it further comprises a partition plate (4) located within the receiving cavity (11) and in a ring shape, the upper end of the partition plate (4) being connected to the inner surface of the top wall (12) and the lower end being connected to the inner surface of the bottom wall (13), the partition plate (4) and the top wall (12), bottom wall (13) enclosing an installation cavity (42) for installing the engine (2); the partition plate (4) has a through hole (41) penetrating the wall thickness; The intake pipe (3) is located outside the installation cavity (42), and the intake hole of the intake pipe (3), the through hole (41) of the partition plate (4), and the intake port of the engine (2) are in communication.

2. The powered surfboard according to claim 1, wherein: A waterproof cover (5) covering the through hole (41) is disposed outside the partition plate (4), the waterproof cover (5) having a perforation (51) penetrating its own wall thickness, and when the housing (1) is in the normal state with the top wall (12) on top, the position of the perforation (51) is higher than the position of the through hole (41); The intake hole of the intake pipe (3), the perforation (51), and the through hole (41) are in communication.

3. The power surfboard according to claim 2, wherein: A waterproof cover (6) for opening or closing the perforation (51) is rotatably disposed outside the perforation (51), the lower end of the waterproof cover (6) being rotatably connected to the partition plate (4), and the upper end of the waterproof cover (6) being a free end; When the housing (1) is in the normal state with the top wall (12) on top, the waterproof cover (6) is in a state of opening the perforation (51); When the housing (1) is in the overturned state with the bottom wall (13) on top, the waterproof cover (6) is in a state of closing the perforation (51).

4. The powered surfboard according to claim 1, characterized in that: An air filter (100) for water-vapor separation is further disposed within the installation cavity (42) at the intake port of the engine (2); The air filter (100) has a hollow inner cavity (100a), a side intake port (100b), a side outlet port (100c), and a bottom drainage port (100d) respectively communicating with the hollow inner cavity (100a), and a U-shaped water guide edge (100e) surrounding the side outlet port (100c) is provided within the cavity wall of the hollow inner cavity (100a), the U-shaped water guide edge (100e) opening in a direction away from the side intake port (100b); The side outlet port (100c) is docked with the intake port of the engine (2); When the housing (1) is in the normal state with the top wall (12) on top, the position of the bottom drainage port (100d) is lower than the U-shaped water guide edge (100e).

5. The powered surfboard according to claim 1, wherein: It further comprises a water guide plate (7) disposed within the receiving cavity (11) and located between the intake pipe (3) and the partition plate (4), the upper end of the water guide plate (7) being connected to the inner surface of the top wall (12) and the lower end being connected to the inner surface of the bottom wall (13); The water guide plate (7) is C-shaped with an opening facing the isolation plate (4), and the through hole (41) of the isolation plate (4) is opposite to the opening of the C-shape. Taking the forward direction of the power surfboard as the front-back direction and the width direction of the power surfboard as the left-right direction, the two ends of the C-shape are located outside the isolation plate (4) and overlap with the isolation plate (4) in the left-right direction; there are gaps between the left and right sides of the water guide plate (7) and the inner cavity wall of the accommodation cavity (11).

6. The power surfboard according to claim 5, wherein: A control module (8) electrically connected to the engine (2) and a fuel tank (9) connected to the engine (2) are spaced apart in the space defined by the water guide plate (7), and the control module (8) and the fuel tank (9) are located outside the installation cavity (42).

7. The powered surfboard according to claim 1, characterized in that: A first opening (14) is provided in the top wall (12) of the outer shell (1) directly above the engine (2), and a first door panel (15) capable of opening or sealing and closing the first opening (14) is provided at the first opening (14).

8. The power surfboard according to claim 6, wherein: A second opening (16) is provided in the top wall (12) of the outer shell (1) directly above the fuel tank (9), and a second door panel (17) capable of opening or sealing and closing the second opening (16) is provided at the second opening (16).

9. The power surfboard according to claim 6, characterized in that: The control module (8) includes a waterproof box, a battery and an electronic controller unit which are arranged in the waterproof box and are both electrically connected to the engine (2). A third opening (18) is provided in the top wall (12) of the outer shell (1), the waterproof box is installed at the third opening (18) and is in sealing cooperation with the wall of the third opening (18), and the surface of the waterproof box is flush with the outer surface of the top wall (12).

10. The power surfboard according to claim 7, wherein: A first drainage pump and a first drainage pipe are provided in the installation cavity (42), the top wall (12) has a drainage hole (19) located outside the first door panel (15), and the two ends of the first drainage pipe (20) are respectively communicated with the first drainage pump (10) and the drainage hole (19).

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