Ship drainage system

Abstract

The invention discloses a ship drainage system which is mounted on a ship and comprises a drainage pipe, a first sewage disposal structure and an anti-backflow structure are arranged at the drainage pipe, and the drainage pipe is connected with a water pump; the water pumping pipe is provided with a second sewage disposal structure, sediments in the water pumping pipe are cleaned through the second sewage disposal structure, and the water pumping pipe is connected with a water pump; the water pump is installed on the ship, a water passing opening is formed in the ship, and the water pump is connected with the water passing opening through a connecting pipeline; the liquid level detection assembly is used for detecting the liquid level in the ship, when the liquid level is higher than a preset threshold value, a signal is sent to the control system to control the water pump to be started, and liquid in the ship is pumped out; and the control system is used for controlling the first sewage disposal structure, the second sewage disposal structure and the water pump. According to the ship drainage system, sediments in the drainage pipeline can be cleaned, the drainage efficiency is improved, and the ship drainage system belongs to the technical field of ship drainage.

Description

Technical Field

[0001] The present invention relates to the technical field of ship drainage, and in particular to a ship drainage system. Background Art

[0002] In traditional ship drainage systems, steel pipes are widely used due to their high strength and low cost. Currently, steel pipes for drainage are usually cleaned regularly by high-pressure water guns or flushing pumps, dismantling pipes for manual cleaning, and setting up sediment collection wells at low points in the pipes to clean sediment regularly.

[0003] In the above-mentioned cleaning structure, flushing the pipeline with a high-pressure water gun or a flushing pump has relatively high limitations. It is impossible to flush the pipeline located in the water, and the flushing effect is poor. Disassembling the pipeline requires a lot of manpower, material resources and time. Setting up a sediment collection well cannot clean the sediment on the pipe wall. In summary, the existing drainage pipe lacks an effective sediment cleaning structure, which will cause the drainage pipe to be blocked, corrosion to be aggravated, and even affect the normal operation and safety of the ship. Summary of the invention

[0004] In view of the above shortcomings, the present invention provides a ship drainage system to solve the problem that the existing drainage pipes lack an effective sediment cleaning structure, resulting in blockage and increased corrosion of the drainage pipes.

[0005] The specific technical solutions are as follows:

[0006] A ship drainage system, the drainage system is installed on a ship, comprising:

[0007] A drainage pipe is provided with a first cleaning structure and an anti-backflow structure. The first cleaning structure is used to clean the sediment in the drainage pipe, and the anti-backflow structure prevents the backflow of liquid in the drainage pipe. The drainage pipe is connected to a water pump;

[0008] A water pumping pipe is provided with a second cleaning structure, and the sediment in the water pumping pipe is cleaned by the second cleaning structure. The water pumping pipe is connected to a water pump;

[0009] A water pump is installed on the ship. The ship is provided with a water inlet, and the water pump is connected to the water inlet through a connecting pipe;

[0010] The liquid level detection component is used to detect the liquid level in the ship. When the liquid level is higher than the preset threshold, it sends a signal to the control system to start the water pump to pump out the liquid in the ship;

[0011] A control system is used to control the first sewage cleaning structure, the second sewage cleaning structure and the water pump.

[0012] Preferably, the first cleaning structure includes a driving motor, a first electric push rod, a guide assembly and a cleaning assembly, the number of the guide assemblies and the cleaning assembly is at least two groups, at least two groups of guide assemblies are evenly distributed circumferentially along the active end of the first electric push rod, and at least two groups of cleaning assemblies are evenly distributed circumferentially along the output shaft of the driving motor; the first electric push rod is installed on the outside or inside of the end of the drain pipe, the fixed end of the driving motor is fixedly connected to the active end of the first electric push rod, the guide assembly is connected to the active end rod of the first electric push rod, the cleaning assembly is connected to the output shaft of the driving motor, and the driving motor and the first electric push rod are both connected to the control system.

[0013] Preferably, the guide assembly includes a first connecting member, a second connecting member and a guide wheel, the two ends of the first connecting member are respectively hinged to the movable end of the first electric push rod and the guide wheel, and the two ends of the second connecting member are respectively hinged to the movable end of the first electric push rod and the first connecting member; wherein the second connecting member is a telescopic rod structure or a spring is connected between the first connecting sleeve and the second connecting sleeve.

[0014] Preferably, the cleaning assembly comprises a fixed rod and a brush, and two ends of the fixed rod are fixedly connected to the output shaft of the driving motor and the brush respectively.

[0015] Preferably, the backflow prevention structure is an electromagnetic valve, which is electrically connected to the control system, or the backflow prevention structure is a baffle-type backflow prevention structure.

[0016] Preferably, the second cleaning structure includes a second electric push rod, a rotating motor, a rotating shaft and a telescopic scraper. The second electric push rod is fixed at one end of the water suction pipe. The rotating motor is connected to the movable end of the second electric push rod for moving in the water suction pipe. The rotating shaft is connected to the output shaft of the rotating motor. The telescopic scraper is connected to the rotating shaft for scraping off the sediment in the water suction pipe. The second electric push rod and the rotating motor are both electrically connected to the control system.

[0017] Preferably, the drainage pipe includes a first horizontal section and a first connecting section, the first horizontal section is arranged horizontally or inclined, the first connecting section is connected to the middle part of the first horizontal section, and the first connecting section is connected to the water pump.

[0018] Preferably, the water pumping pipe includes a second horizontal section and a second connecting section, the second horizontal section is arranged horizontally or inclined, the second connecting section is connected to the middle part of the second horizontal section, and the second connecting section is connected to the water pump.

[0019] Preferably, filter screens are provided at the outer ends of the water suction pipe and the drainage pipe.

[0020] Preferably, a first fan blade and a second fan blade are provided in the connecting pipe, and the first fan blade and the second fan blade are rotatably arranged in the connecting pipe through a first rotating shaft and a second rotating shaft respectively. The first fan blade rotates in a radial direction relative to the connecting pipe, and the second fan blade rotates in an axial direction relative to the connecting pipe. The first rotating shaft is connected to the second rotating shaft through a transmission rod, the transmission rod and the first rotating shaft are connected through a bevel gear set, and the transmission rod and the second rotating shaft are connected through a bevel gear set.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The ship drainage system of the present invention can effectively solve the sediment accumulation problem by arranging corresponding pollution cleaning structures at the drainage pipe and the pumping pipe, improve drainage efficiency, extend the service life of the pipe, and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0024] Figure 1 A three-dimensional diagram of a ship drainage system.

[0025] Figure 2 A schematic diagram of a drainage pipe.

[0026] Figure 3 Schematic diagram of the water pipe.

[0027] Figure 4 Schematic diagram of the first cleaning structure.

[0028] Figure 5 Schematic diagram of the fixed rod.

[0029] Figure 6 This is a schematic diagram of a first fan blade and a second fan blade being arranged in a connecting pipe.

[0030] 1 is a drain pipe, 11 is a first horizontal section, 12 is a first connecting section, 2 is a first cleaning structure, 3 is an intermediate bin, 4 is a water suction pipe, 41 is a second horizontal section, 42 is a second connecting section, 5 is a second cleaning structure, 6 is a water pump, 7 is a connecting pipe, 811 is a second connecting piece, 812 is a first connecting piece, 82 is a guide wheel, 83 is a driving motor, 84 is a fixed rod, 85 is a brush, 91 is a rotating motor, 92 is a telescopic rod, 93 is a scraper, 841 is a fixed cylinder, 842 is a movable cylinder, 843 is a telescopic spring, 20 is a water outlet, 21 is a first fan blade, 22 is a second fan blade, 23 is a bevel gear set, and 24 is a transmission rod. DETAILED DESCRIPTION

[0031] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment 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.

[0032] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0033] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] like Figure 1-Figure 6 As shown, this embodiment provides a ship drainage system, which is installed on a ship and includes:

[0036] Drain pipe 1, a first cleaning structure 2 and a backflow prevention structure are provided at the drain pipe 1, the first cleaning structure 2 is used to clean the sediment in the drain pipe 1, and the backflow prevention structure prevents the backflow of liquid in the drain pipe 1, and the drain pipe 1 is connected to a water pump 6;

[0037] A water pumping pipe 4 is provided with a second cleaning structure 5, and the sediment in the water pumping pipe 4 is cleaned by the second cleaning structure 5. The water pumping pipe 4 is connected to a water pump 6;

[0038] A water pump 6 is installed on the ship. The ship is provided with a water inlet 20. The water pump 6 is connected to the water inlet 20 through a connecting pipe 7.

[0039] Specifically, an intermediate chamber 3 is connected between the water pump 6 and the water suction pipe 4 and the drainage pipe, and the water pumped out or pumped into the cabin is transferred through the intermediate chamber 3; corresponding solenoid valves can be set at the connection between the intermediate chamber and the water suction pipe 4 and the drainage pipe 1 to achieve connection or closing action.

[0040] The liquid level detection component is used to detect the liquid level in the ship. When the liquid level is higher than a preset threshold, a signal is sent to the control system to start the water pump 6 to pump out the liquid in the ship;

[0041] The control system is used to control the first sewage cleaning structure 2 , the second sewage cleaning structure 5 and the water pump 6 .

[0042] When the ship needs to drain water or the liquid level detection component detects that the liquid level height in the ship is higher than a preset threshold, the control system controls the water pump 6 to start. When the ship needs to draft and adjust the hull height, the control system controls the water pump 6 to pump water into the cabin. After draining and pumping water, the control system can control the first cleaning structure 2 and the second cleaning structure 5 to clean the suction pipe 4 and the drainage pipe 1 respectively to avoid blockage caused by accumulation of sediment in the suction pipe 4 and the drainage pipe 1.

[0043] The control system uses an existing controller, which will not be described in detail here.

[0044] The first cleaning structure 2 includes a driving motor 83, a first electric push rod, a guide assembly and a cleaning assembly. The first electric push rod is installed on the outside or inside of the end of the drain pipe 1. The fixed end of the driving motor 83 is fixedly connected to the movable end of the first electric push rod. The guide assembly is connected to the movable end rod of the first electric push rod. The cleaning assembly is connected to the output shaft of the driving motor 83. The driving motor 83 and the first electric push rod are both connected to the control system.

[0045] The guide assembly includes a first connector 812, a second connector 811 and a guide wheel 82. The two ends of the first connector 812 are respectively hinged to the movable end of the first electric push rod and the guide wheel 82, and the two ends of the second connector 811 are respectively hinged to the movable end of the first electric push rod and the first connector 812; wherein, the second connector 811 is a telescopic rod structure or a spring is connected between the first connecting sleeve and the second connecting sleeve. During the process of the movable end of the first electric push rod extending into the drain pipe 1, since there may be deviations in the extension direction, the movable end of the first electric push rod is assisted and guided to be coaxial with the drain pipe 1 by the guide assembly to ensure that the cleaning assembly can fully contact the inner wall of the drain pipe 1. The principle is that the movable end of the first electric push rod is assisted and supported by the first connector and the second connector of the telescopic rod structure. When the extension direction of the movable end of the first electric push rod deviates, the first connector and the second connector support it, so as to reset the movable end of the first electric push rod to be coaxial with the drain pipe as much as possible.

[0046] The cleaning assembly includes a fixed rod 84 and a brush 85, and the two ends of the fixed rod 84 are respectively fixedly connected to the output shaft of the drive motor 83 and the brush 85. The fixed rod 84 can be fixedly connected to the output shaft of the drive motor 83 by screws or latches, and the brush 85 can be fixedly connected to the fixed rod 84 by screws or latches. When the fixed rod 84 rotates with the output shaft of the drive motor 83, the brush 85 cleans the inner wall of the drain pipe 1 to remove the sediment, ensuring that the drain pipe 1 will not be blocked.

[0047] In some embodiments, taking into account the different inner diameters of the pipelines, if it is to be applied to different pipeline cleaning, the fixed rod 84 can be designed as a telescopic rod structure. For example, the fixed rod 84 includes a fixed cylinder 841, a movable cylinder 842 and a telescopic spring 843. The fixed cylinder 841 and the movable cylinder 842 are sleeved and slidably connected, and the telescopic spring 843 is fixedly connected to the fixed cylinder 841 and the movable cylinder 842 to achieve cleaning according to different inner diameters of pipelines.

[0048] The backflow prevention structure is an electromagnetic valve, which is electrically connected to the control system, or the backflow prevention structure is a baffle-type backflow prevention structure. Both the electromagnetic valve and the baffle-type backflow prevention structure are existing products or structures, which will not be described in detail here. They are mainly used to prevent water from entering the ship from the drainage pipe 1 or the pumping pipe 4 during the ship's travel.

[0049] In some embodiments, corresponding valves may also be provided at the water inlet of the ship.

[0050] The second cleaning structure 5 includes a second electric push rod, a rotating motor 91, a rotating shaft and a telescopic scraper. The second electric push rod is fixed at one end of the water pumping pipe 4. The rotating motor 91 is connected to the movable end of the second electric push rod to move in the water pumping pipe 4. The rotating shaft is connected to the output shaft of the rotating motor 91. The telescopic scraper is connected to the rotating shaft to scrape off the sediment in the water pumping pipe 4. The second electric push rod and the rotating motor 91 are both electrically connected to the control system. After the second electric push rod is started, it drives the rotating motor 91 to move into the water pumping pipe 4. The rotating motor 91 drives the rotating shaft to rotate. The rotating shaft drives the telescopic scraper to rotate. The telescopic scraper performs a scraping action on the inner wall of the water pumping pipe 4 to scrape off the silt sediment attached to and deposited on the inner wall of the water pumping pipe 4. The entire process of scraping and sweeping is repeated multiple times along the water pumping pipe 4 to ensure that the sediment in the water pumping pipe 4 has been scraped off.

[0051] In some embodiments, a corresponding guide structure may also be provided at the movable end of the second electric push rod to assist the extension direction of the second electric push rod to be coaxial with the water pumping pipe.

[0052] Specifically, the telescopic scraper includes a telescopic rod 92 and a scraper 93 , one end of the telescopic rod is fixedly connected to the output shaft of the rotating motor 91 , and the other end of the telescopic rod is connected to the scraper, and the telescopic rod can be consistent with the telescopic structure of the fixed rod 84 .

[0053] In some embodiments, the first cleaning structure 2 and the second cleaning structure 5 can be configured as detachable structures for easy maintenance. For example, they can be connected by bolts and nuts, and the nuts can be tightened during installation and loosened during disassembly.

[0054] The drain pipe 1 includes a first horizontal section 11 and a first connecting section 12. The first horizontal section 11 is arranged horizontally or obliquely. The first connecting section 12 is connected to the middle of the first horizontal section 11 and is connected to the water pump 6. It should be noted that the first horizontal section 11 is easily accumulated with sediments when it is immersed in water for a long time. Therefore, the first sewage cleaning structure 2 is arranged in the first horizontal section 11, and the first connecting section 12 extends upward and is connected to the water pump 6. When the ship is traveling in the water, water can only enter the position at the same height as the water surface. Considering that the sediments will move with the first horizontal section 11 under its own weight, there will be basically no sediments in the first connecting section 12, and there will be no blockage. Therefore, the first connecting section 12 does not need to be provided with a corresponding sewage cleaning structure.

[0055] The pumping pipe 4 includes a second horizontal section 41 and a second connecting section 42. The second horizontal section 41 is arranged horizontally or inclined. The second connecting section 42 is connected to the middle of the second horizontal section 41, and the second connecting section 42 is connected to the water pump 6. It should be noted that the pumping pipe 4 needs to pump water from the water in which the ship is traveling into the cabin so that the draft of the ship is adjusted to a corresponding height. In this process, the pumping pipe 4 can be arranged in the same manner as the drainage pipe 1, or it can be arranged inclined to reduce the accumulation of sediments in the pumping pipe 4. However, considering that some ships need to travel in areas with shallow water depths, if the pumping pipe 4 extends to a deeper depth, there is interference with the bottom of the water. Therefore, the pumping pipe 4 is generally arranged to be relatively horizontal and higher than the bottom of the ship. As long as the bottom of the ship does not contact the bottom of the water, the pumping pipe 4 will not interfere. The ship will drop a part in the water, and the pumping pipe 4 can extend into the water to achieve pumping.

[0056] The outer ends of the water pumping pipe 4 and the drainage pipe 1 are both provided with filter nets. By providing the filter nets at the outer ends of the water pumping pipe 4 and the drainage pipe 1, the filter nets can prevent relatively large garbage from entering the water pumping pipe 4 during the pumping process, while the drainage pipe 1 can prevent relatively large garbage from entering during the sailing process of the ship, causing the drainage pipe 1 to be blocked.

[0057] In some embodiments, a filter screen is also provided at the water inlet on the ship to prevent debris on the ship from entering the connecting pipe 7 through the water inlet, thereby preventing the water in the ship from being pumped out by the water pump 6 .

[0058] The number of guide components and cleaning components is at least two. Exemplarily, the number of guide components is three, and the three groups of guide components are evenly distributed on the active end of the first electric push rod. The number of cleaning components is four, and the four groups of cleaning components are evenly distributed on the output shaft of the drive motor 83. The guide wheels 82 of the three groups of guide components are used to contact and support the inner wall of the pipe, so that the active end of the first electric push rod is coaxial with the drain pipe 1, ensuring that the brushes 85 of the cleaning components are in contact with the inner wall of the pipe. When the drive motor 83 drives the brushes 85 to rotate in the pipe, the sediment on the inner wall of the pipe can be fully cleaned.

[0059] A first blade 21 and a second blade 22 are arranged in the connecting pipe, and the first blade and the second blade are rotatably arranged in the connecting pipe through the first rotating shaft and the second rotating shaft respectively. The first blade rotates in the radial direction relative to the connecting pipe, and the second blade rotates in the axial direction relative to the connecting pipe. The first rotating shaft is connected by a transmission rod and a second rotating shaft, and the transmission rod and the first rotating shaft are connected by a bevel gear set, and the transmission rod 24 and the second rotating shaft are connected by a bevel gear set 23. Specifically, since the first blade rotates in the radial direction relative to the connecting pipe, it needs to be connected to the transmission rod through a transfer transmission, and the bevel gear set on the first rotating shaft is transmitted to the transfer rod, and the transfer rod is transmitted to the transmission rod through the bevel gear set; when pumping or draining water, the water flow drives the second blade to rotate, the second blade drives the second rotating shaft to rotate, the second rotating shaft drives the transmission rod to rotate, the transmission rod drives the transfer rod to rotate, the transfer rod drives the first rotating shaft to rotate, and the first rotating shaft drives the first blade to rotate. The whole process does not need to add an additional drive motor, and the connecting pipe is cleaned by the first blade and the second blade to ensure that the connecting pipe will not be blocked.

[0060] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A ship drainage system, the drainage system is installed on a ship, characterized in that: include: A drainage pipe is provided with a first cleaning structure and an anti-backflow structure. The first cleaning structure is used to clean the sediment in the drainage pipe, and the anti-backflow structure prevents the backflow of liquid in the drainage pipe. The drainage pipe is connected to a water pump; A water pumping pipe is provided with a second cleaning structure, and the sediment in the water pumping pipe is cleaned by the second cleaning structure. The water pumping pipe is connected to a water pump; A water pump is installed on the ship. The ship is provided with a water inlet, and the water pump is connected to the water inlet through a connecting pipe; The liquid level detection component is used to detect the liquid level in the ship. When the liquid level is higher than the preset threshold, it sends a signal to the control system to start the water pump to pump out the liquid in the ship; A control system is used to control the first sewage cleaning structure, the second sewage cleaning structure and the water pump.

2. A ship drainage system according to claim 1, characterized in that: The first cleaning structure includes a driving motor, a first electric push rod, a guide assembly and a cleaning assembly. The number of the guide assembly and the cleaning assembly is at least two groups. At least two groups of guide assemblies are evenly distributed along the circumference of the active end of the first electric push rod. At least two groups of cleaning assemblies are evenly distributed along the circumference of the output shaft of the driving motor. The first electric push rod is installed on the outside or inside of the end of the drain pipe, the fixed end of the driving motor is fixedly connected to the active end of the first electric push rod, the guide assembly is connected to the active end rod of the first electric push rod, the cleaning assembly is connected to the output shaft of the driving motor, and the driving motor and the first electric push rod are both connected to the control system.

3. A ship drainage system according to claim 2, characterized in that: The guide assembly includes a first connecting member, a second connecting member and a guide wheel, wherein two ends of the first connecting member are respectively hinged to the movable end of the first electric push rod and the guide wheel, and two ends of the second connecting member are respectively hinged to the movable end of the first electric push rod and the first connecting member; wherein the second connecting member is a telescopic rod structure or a spring is connected between the first connecting sleeve and the second connecting sleeve.

4. A ship drainage system according to claim 2, characterized in that: The dirt cleaning component comprises a fixed rod and a brush, and two ends of the fixed rod are respectively fixedly connected to the output shaft of the driving motor and the brush.

5. A ship drainage system according to claim 1, characterized in that: The backflow prevention structure is an electromagnetic valve, which is electrically connected to the control system, or the backflow prevention structure is a baffle-type backflow prevention structure.

6. A ship drainage system according to claim 1, characterized in that: The second cleaning structure includes a second electric push rod, a rotating motor, a rotating shaft and a telescopic scraper. The second electric push rod is fixed at one end of the water suction pipe. The rotating motor is connected to the movable end of the second electric push rod for moving in the water suction pipe. The rotating shaft is connected to the output shaft of the rotating motor. The telescopic scraper is connected to the rotating shaft for scraping off the sediment in the water suction pipe. The second electric push rod and the rotating motor are both electrically connected to the control system.

7. A ship drainage system according to claim 1, characterized in that: The drainage pipe comprises a first horizontal section and a first connecting section. The first horizontal section is arranged horizontally or inclined. The first connecting section is communicated with the middle part of the first horizontal section and is connected to a water pump.

8. A ship drainage system according to claim 1, characterized in that: The water pumping pipe comprises a second horizontal section and a second connecting section. The second horizontal section is arranged horizontally or inclined. The second connecting section is communicated with the middle part of the second horizontal section and is connected to the water pump.

9. A ship drainage system according to claim 1, characterized in that: The outer ends of the suction pipe and the drainage pipe are both provided with filter screens.

10. A ship drainage system according to claim 1, characterized in that: A first fan blade and a second fan blade are provided in the connecting pipe, and the first fan blade and the second fan blade are rotatably arranged in the connecting pipe through a first rotating shaft and a second rotating shaft respectively. The first fan blade rotates in a radial direction relative to the connecting pipe, and the second fan blade rotates in an axial direction relative to the connecting pipe. The first rotating shaft is connected to the second rotating shaft through a transmission rod, the transmission rod and the first rotating shaft are connected through a bevel gear set, and the transmission rod and the second rotating shaft are connected through a bevel gear set.

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