A ship gas drag reduction device and drag reduction method

Abstract

The present invention relates to a ship gas drag reduction device and drag reduction method, comprising a hull, two U-shaped plates are fixed on the bottom surface of the hull, a bubble plate is attached between the U-shaped plates, a limit assembly for fixing the bubble plate is provided on the U-shaped plate at the tail, a plurality of jet holes connected to a straight groove are opened on the bottom surface of the bubble plate, and a cleaning mechanism for scrubbing the bubble plate to avoid clogging of the jet holes is provided on the bottom surface of the bubble plate. When the ship gas drag reduction device is used, the bubble plate is connected to an external gas source device, and the gas source device is controlled to transport gas into the bubble plate, the gas forms bubbles through the jet holes, and the bubbles gather into an air film at the bottom of the hull, thereby reducing the resistance of the hull during driving through the gas, and the bottom surface of the bubble plate can be scrubbed by the cleaning mechanism, and the bubble plate is prevented from being immersed in the water for a long time to block the jet holes by water plants, so as to ensure that the bubble plate can produce a good quality air film to reduce the drag of the hull.

Description

Technical Field

[0001] The present invention relates to the technical field of ship drag reduction, and in particular to a ship gas drag reduction device and a drag reduction method. Background Art

[0002] Speed ​​is an important indicator to measure the performance of ships and underwater vehicles. Under the same input power, the speed is closely related to the resistance they encounter. The resistance encountered by ships and underwater vehicles is composed of three parts: friction resistance, pressure difference resistance and wave-making resistance, among which friction resistance accounts for the largest proportion.

[0003] In order to reduce the friction resistance between the ship and the water body during the driving process, the current mainstream drag reduction methods include groove drag reduction and gas drag reduction. For example, a Chinese patent (Announcement No.: CN 208602639 U) discloses an air film drag reduction device, which is firstly provided with a bubble generating device, and secondly provided with a ventilation pipe network and a jet hole. During the driving process of the hull, bubbles are introduced into the ventilation pipe network through the bubble generating device, and the bubbles are sprayed through the jet hole to form an air film layer between the bottom of the hull and the water body, thereby reducing the navigation resistance of the ship.

[0004] However, it still has some shortcomings. The ventilation pipe network is located at the bottom of the hull and is therefore immersed in the water body. The water body is a complex environment. The ventilation pipe network will slowly grow some aquatic plants when immersed in the water body for a long time. If these aquatic plants are not cleaned, they will block the jet holes, thereby making the bubbles ejected from the ventilation network pipe uneven, which is not conducive to the formation of a bubble film to reduce the drag of the hull, reducing the drag reduction effect of the hull and causing certain inconveniences in use. Therefore, a ship gas drag reduction device and a drag reduction method are proposed to solve the above problems. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a ship gas drag reduction device and a drag reduction method, which have the advantage of ensuring the quality of the air film and solve the problem that the above-mentioned search patent may cause uneven bubbles and thus affect the quality of the air film under certain circumstances.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a ship gas drag reduction device, including a hull, two U-shaped plates are fixed on the bottom surface of the hull from front to back, a baffle is fixed on the outer side of the U-shaped plate near the stern, a bubble plate is fitted between the two U-shaped plates, and a limiting component for fixing the bubble plate is provided on the U-shaped plate near the bow, a transverse groove is provided in the bubble plate, a plurality of straight grooves connected to the transverse groove are provided in the bubble plate, a plurality of jet holes connected to the straight grooves are provided on the bottom surface of the bubble plate, and a cleaning mechanism for brushing the bubble plate to prevent the jet holes from being blocked is provided on the bottom surface of the bubble plate.

[0007] The cleaning mechanism comprises two support plates fixed to the bottom surface of the hull and respectively located on both sides of the bubble plate, wherein the two support plates are provided with slide grooves on opposite sides, wherein a slider is slidably connected in the slide groove, a bottom plate is fixed between the two sliders, two telescopic rods distributed left and right are fixed on the top surface of the bottom plate, a U-shaped frame is fixed on the top of the telescopic rod, abutment springs are mounted on the outer peripheral wall of the telescopic rod, a scrubbing block is fixed between the inner walls on the left and right sides of the U-shaped frame, a motor is fixed on the inner bottom wall of the stern of the hull, a transmission warehouse is fixed on the bottom surface of the hull and directly below the motor, a rotating shaft is fixed on the output shaft of the motor, the rotating shaft is rotatably connected to the hull, a threaded block is fixed on the top surface of the bottom plate, a screw having one end penetrating the transmission warehouse and extending into the interior thereof is threadedly connected to the threaded block, the screw is rotatably connected to the transmission warehouse, a main bevel gear is fixed on the bottom end of the rotating shaft, and a slave bevel gear meshing with the main bevel gear is fixed on the screw.

[0008] Preferably, the U-shaped plate buckle forms a transversely penetrating rectangular hole between the bottom surface of the hull and the hull, and the bubble plate is gap-matched with the rectangular hole.

[0009] Preferably, the plurality of straight grooves are divided into two groups, and the plurality of straight grooves in the same group are equidistantly distributed front to back, and the two groups of straight grooves are respectively located on the left and right sides of the transverse groove, and a connecting pipe connected to the transverse groove is fixed on the front side of the bubble plate.

[0010] Preferably, the top ends of the two telescopic rods are fixed on the same U-shaped frame, the scrubbing block is a cloth block, and the threaded block is provided with a threaded hole for the screw to penetrate and be threadedly connected thereto.

[0011] Preferably, the transmission chamber is in the shape of a rectangular parallelepiped with a hollow interior and a missing top surface, and the connection portion between the screw and the transmission chamber and the connection portion between the rotating shaft and the hull are both sealed and waterproofed.

[0012] Preferably, the limit assembly includes two connecting plates respectively fixed on the left and right sides of the U-shaped plate, the bottom surface of the U-shaped plate is provided with a plurality of through holes distributed on the left and right, the bottom surface of the bubble plate is provided with a plurality of limit grooves distributed on the left and right, the top surface of the connecting plate is slidably connected with a connecting rod whose bottom end passes through the connecting plate and extends to the bottom thereof, a support plate is fixed to the bottom end of the connecting rod, and a plurality of limit blocks distributed on the left and right and respectively passing through a plurality of through holes are fixed to the top surface of the support plate, and a limit spring is mounted on the outer peripheral wall of the connecting rod.

[0013] Preferably, the top surface of the connecting plate is provided with a guide hole for the connecting rod to pass through and to fit with the connecting rod with clearance, the top end of the connecting rod is fixed with a limit rod, the top end of the limit spring is fixed on the limit rod, and the bottom end thereof is fixed on the connecting plate.

[0014] Preferably, the through hole and the limiting groove are opposed to each other in upper and lower directions, and the limiting block is clearance-matched with the through hole and the limiting groove.

[0015] A method for reducing gas drag on a ship, comprising the following steps:

[0016] S1. Connect the bubble plate to the air source device on the hull through the connecting pipe, start the air source device and control the air source device;

[0017] S2, transporting gas into the connecting pipe, so that the gas enters the bubble plate and forms bubbles through the jet holes, and the bubbles gather into an air film at the bottom of the hull;

[0018] S3, driving the hull to travel, when the jet hole is blocked, starting the motor, the motor drives the scrubbing block to scrub the bottom surface of the bubble plate, remove the blockage on the bottom surface of the bubble plate, and ensure that a uniform air film can be formed on the bottom of the hull;

[0019] S4. After the bubble plate is cleaned, turn off the motor;

[0020] S5. When the bubble plate is corroded and damaged and needs to be replaced, remove the connection between the connecting pipe and the external air source device, pull down the support plate, the support plate drives the limit block to move down and out of the limit groove, pull out the bubble plate forward for replacement, and after replacement, reverse this operation to complete the installation.

[0021] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0022] 1. When the ship gas drag reduction device is in use, the bubble plate is connected to an external gas source device, and the gas source device is controlled to transport gas into the bubble plate. The gas forms bubbles through the jet holes, and the bubbles gather into an air film at the bottom of the hull, thereby reducing the resistance of the hull during driving through the gas. The bottom surface of the bubble plate can be scrubbed by the cleaning mechanism, and the bubble plate is prevented from being immersed in the water for a long time to block the jet holes by water plants, so as to ensure that the bubble plate can produce a good quality air film to reduce the drag of the hull.

[0023] 2. For the ship's gas drag reduction device, when the bubble plate is immersed in water for a long time and some parts are corroded and damaged, the limit assembly can quickly release the limit of the bubble plate, and then replace the bubble plate. The limit assembly does not use fasteners such as bolts, which can avoid the situation where it is inconvenient to disassemble due to corrosion and rust of the bolts, and is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the top view of the structure of the bubble plate of the present invention;

[0026] Figure 3For the present invention Figure 1 The enlarged schematic diagram of point A in the middle;

[0027] Figure 4 It is a side view schematic diagram of the cleaning mechanism of the present invention;

[0028] Figure 5 It is a side view schematic diagram of the limiting assembly of the present invention.

[0029] In the figure: 1 hull, 2 U-shaped plate, 3 baffle, 4 bubble plate, 5 limit assembly, 501 connecting plate, 502 through hole, 503 limit groove, 504 connecting rod, 505 support plate, 506 limit block, 507 limit spring, 6 transverse groove, 7 vertical groove, 8 jet hole, 9 cleaning mechanism, 901 support plate, 902 slide groove, 903 slider, 904 bottom plate, 905 telescopic rod, 906 U-shaped frame, 907 abutment spring, 908 scrubbing block, 909 motor, 910 transmission compartment, 911 rotating shaft, 912 threaded block, 913 screw, 914 main bevel gear, 915 slave bevel gear. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-4, a ship gas drag reduction device in this embodiment includes a hull 1, two U-shaped plates 2 are fixed to the bottom surface of the hull 1 from front to back, a baffle 3 is fixed to the rear side of the U-shaped plate 2 near the stern, a bubble plate 4 is fitted between the two U-shaped plates 2, the baffle 3 is mainly used to limit the bubble plate 4, and a limiting component 5 for fixing the bubble plate 4 is provided on the left U-shaped plate 2. When the bubble plate 4 is immersed in water for a long time and some parts are corroded and damaged, the limiting component 5 can be used to quickly release the limiting of the bubble plate 4, and then the bubble plate 4 can be replaced. The limiting component 5 does not use fixing parts such as bolts, which can avoid the situation that it is inconvenient to disassemble due to corrosion and rust of the bolts. A transverse groove 6 is opened in the bubble plate 4, and the bubble plate 4 is provided with a transverse groove 6. A plurality of straight grooves 7 connected with the transverse grooves 6 are provided, and a plurality of air jet holes 8 connected with the straight grooves 7 are provided on the bottom surface of the bubble plate 4. When in use, the bubble plate 4 is connected to an external air source device, and the air source device is controlled to transport gas into the bubble plate 4. The gas forms bubbles through the air jet holes 8, and the bubbles gather into an air film at the bottom of the hull 1, thereby reducing the resistance of the hull 1 during driving through the gas. A cleaning mechanism 9 is provided on the bottom surface of the bubble plate 4 for scrubbing the bubble plate 4 to avoid clogging of the air jet holes 8. The cleaning mechanism 9 can be used to scrub the bottom surface of the bubble plate 4 to avoid the bubble plate 4 being immersed in the water for a long time to cause the air jet holes 8 to be blocked by water plants, so as to ensure that the bubble plate 4 can produce an air film of good quality to reduce the resistance of the hull 1.

[0032] It should be noted that the gas source device is used to provide gas source to the bubble plate 4. The gas source provided can be air or other harmless gases. This type of gas source device is a mature and public technology in the prior art. Therefore, the structure and working principle of the gas source device are not described in detail in this article.

[0033] The cleaning mechanism 9 includes two support plates 901 fixed to the bottom surface of the hull 1 and located on both sides of the bubble plate 4 respectively. A slide groove 902 is provided on the opposite side of the two support plates 901. A slider 903 is slidably connected in the slide groove 902. A bottom plate 904 is fixed between the two sliders 903. Two telescopic rods 905 are symmetrically fixed to the top surface of the bottom plate 904. A U-shaped frame 906 is fixed to the top of the telescopic rod 905. Abutment springs 907 are set on the outer peripheral wall of the telescopic rod 905. A scrubbing block 908 is fixed between the inner walls of the left and right sides of the U-shaped frame 906. The scrubbing block 908 can be better contacted with the bottom surface of the bubble plate 4 through the abutment springs 907. Then, the scrubbing block 908 is driven to scrub the bottom surface of the bubble plate 4 by sliding back and forth on the slide groove 902 through the bottom plate 904. A motor 909 is fixed to the inner bottom wall of the hull 1 and close to the right side. The bottom surface of the hull 1 and located at A transmission bin 910 is fixed directly below the motor 909, and a rotating shaft 911 is fixed on the output shaft of the motor 909, the bottom end of which passes through the hull 1 and extends into the transmission bin 910, and the rotating shaft 911 is rotatably connected to the hull 1, and a threaded block 912 is fixed to the top surface of the bottom plate 904, and a screw 913 with one end passing through the transmission bin 910 and extending into the inside thereof is threadedly connected to the threaded block 912, and the screw 913 is rotatably connected to the transmission bin 910, and a main bevel gear 914 is fixed to the bottom end of the rotating shaft 911, and a slave bevel gear 915 meshing with the main bevel gear 914 is fixed at one end of the screw 913. When the motor 909 is started, the motor 909 drives the rotating shaft 911 to rotate, and the rotating shaft 911 drives the screw 913 to rotate through the main bevel gear 914 and the slave bevel gear 915, and the screw 913 cooperates with the threaded block 912 to drive the bottom plate 904 to move back and forth, so that automatic cleaning can be achieved, which is more convenient.

[0034] In this embodiment, the U-shaped plate 2 is buckled between the bottom surface of the hull 1 and the hull 1 to form a transversely penetrating rectangular hole, and the bubble plate 4 is gap-matched with the rectangular hole. Such a structure facilitates the bubble plate 4 to be more stably fixed to the bottom surface of the hull 1.

[0035] The plurality of straight grooves 7 are evenly divided into two groups. The plurality of straight grooves 7 in the same group are evenly distributed front to back. The two groups of straight grooves 7 are respectively located on the left and right sides of the transverse groove 6. Such a structure is conducive to the bubble plate 4 to produce a uniform bubble film, so as to utilize the bubble film to reduce the friction between the hull 1 and the water body. A connecting pipe connected to the transverse groove 6 is fixed on the bubble plate 4, and the connection and disconnection with the air source device is facilitated by the connecting pipe.

[0036] The top ends of the two telescopic rods 905 are fixed on the same U-shaped frame 906. The scrubbing block 908 is a cloth block. The threaded block 912 is provided with a threaded hole for the screw rod 913 to penetrate and be threadedly connected thereto.

[0037] The shape of the transmission compartment 910 is a rectangular parallelepiped with a hollow interior and a missing top surface. The connection part between the screw 913 and the transmission compartment 910 and the connection part between the shaft 911 and the hull 1 are both sealed and waterproof. It should be noted that sealing and waterproofing is a mature and public technology in the prior art, so the specific method will not be described in detail in this article.

[0038] See also Figure 5 In order to facilitate the removal of the bubble plate 4, in this embodiment, the limiting assembly 5 includes two connecting plates 501 respectively fixed on the left and right sides of the U-shaped plate 2, the bottom surface of the U-shaped plate 2 is provided with a plurality of through holes 502 distributed left and right, the bottom surface of the bubble plate 4 and near the left side is provided with a plurality of limiting grooves 503 distributed left and right, the top surface of the connecting plate 501 is slidably connected with a connecting rod 504 with a bottom end penetrating the connecting plate 501 and extending to the bottom thereof, the bottom end of the connecting rod 504 is fixed with a supporting plate 505, and the top surface of the supporting plate 505 is fixed with a plurality of left-distributed The limit blocks 506 are distributed on the right and penetrate multiple through holes 502 respectively. When the bubble plate 4 needs to be removed, the support plate 505 is pulled downward so that the support plate 505 drives the limit blocks 506 to move downward and out of the limit groove 503. At this time, the bubble plate 4 can be removed. The limiting spring 507 is installed on the outer peripheral wall of the connecting rod 504. When the support plate 505 moves downward, it also drives the connecting rod 504 to move downward, and the limiting spring 507 is squeezed by the connecting rod 504, so that when the bubble plate 4 is installed, the limit block 506 is driven to move up for limiting by the limiting spring 507.

[0039] In this embodiment, a guide hole is provided on the top surface of the connecting plate 501 for the connecting rod 504 to pass through and to fit with the connecting rod 504 with a clearance. A limiting rod is fixed to the top end of the connecting rod 504. The top end of the limiting spring 507 is fixed on the limiting rod, and the bottom end thereof is fixed on the connecting plate 501. Such a structure facilitates more stable fixing of the bubble plate 4.

[0040] The through hole 502 and the limiting groove 503 are vertically opposed to each other, and the limiting block 506 is loosely matched with the through hole 502 and the limiting groove 503 .

[0041] A method for reducing gas drag on a ship, comprising the following steps:

[0042] S1, connecting the bubble plate 4 to the air source device on the hull 1 through the connecting pipe, starting the air source device and controlling the air source device;

[0043] S2, transporting gas into the connecting pipe, so that the gas enters the bubble plate 4 and forms bubbles through the air jet holes 8, and the bubbles gather into an air film at the bottom of the hull 1;

[0044] S3, driving the hull 1 to travel, when the jet hole 8 is blocked, starting the motor 909, the motor 909 drives the scrubbing block 908 to scrub the bottom surface of the bubble plate 4, remove the blockage on the bottom surface of the bubble plate 4, and ensure that a uniform air film can be formed on the bottom of the hull 1;

[0045] S4, after the bubble plate 4 is cleaned, the motor 909 is turned off;

[0046] S5. When the bubble plate 4 is corroded and damaged and needs to be replaced, remove the connection between the connecting pipe and the external air source device, pull down the support plate 505, and the support plate 505 drives the limit block 506 to move down and out of the limit groove 503, and pull out the bubble plate 4 forward for replacement. After replacement, reverse this operation to complete the installation.

[0047] The above steps can effectively ensure that the bubble plate 4 produces a uniform air film, thereby ensuring the drag reduction effect of the hull 1.

[0048] The working principle of the above embodiment is:

[0049] 1. When in use, the bubble plate 4 is connected to an external air source device, and the air source device is controlled to transport gas into the bubble plate 4. The gas forms bubbles through the jet holes 8, and the bubbles gather into an air film at the bottom of the hull 1, thereby reducing the resistance of the hull 1 during driving through the gas. The motor 909 is started, and the motor 909 drives the rotating shaft 911 to rotate. The rotating shaft 911 drives the screw 913 to rotate through the main bevel gear 914 and the slave bevel gear 915. The screw 913 cooperates with the threaded block 912 to drive the bottom plate 904 to move forward and backward. The bottom plate 904 drives the U-shaped frame 906 to move forward and backward through the telescopic rod 905, so that the scrubbing block 908 scrubs the bottom surface of the bubble plate 4 to remove the blockage on the bottom surface of the bubble plate 4.

[0050] 2. When the bubble plate 4 needs to be removed, pull the support plate 505 downward so that the support plate 505 drives the limit block 506 to move downward and out of the limit groove 503. At this time, the bubble plate 4 can be removed. When the support plate 505 moves downward, it also drives the connecting rod 504 to move downward, and the limit spring 507 is squeezed by the connecting rod 504, so that when the bubble plate 4 is installed, the limit block 506 is driven to move upward for limiting through the limit spring 507.

[0051] In the description of this patent, it should be understood that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0052] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A ship gas drag reduction device, comprising a hull (1), characterized in that: Two U-shaped plates (2) are fixed on the bottom surface of the hull (1) from front to back, a baffle (3) is fixed on the outer side of the U-shaped plate (2) near the stern, a bubble plate (4) is bonded between the two U-shaped plates (2), a limiting component (5) for fixing the bubble plate (4) is provided on the U-shaped plate (2) near the bow, a transverse groove (6) is provided in the bubble plate (4), a plurality of straight grooves (7) connected to the transverse groove (6) are provided in the bubble plate (4), a plurality of air jet holes (8) connected to the straight grooves (7) are provided on the bottom surface of the bubble plate (4), and a cleaning mechanism (9) for brushing the bubble plate (4) to prevent the air jet holes (8) from being blocked is provided on the bottom surface of the bubble plate (4); The cleaning mechanism (9) comprises two support plates (901) fixed to the bottom surface of the hull (1) and respectively located on both sides of the bubble plate (4); a slide groove (902) is provided on the opposite sides of the two support plates (901); a slider (903) is slidably connected in the slide groove (902); a bottom plate (904) is fixed between the two sliders (903); two telescopic rods (905) distributed on the left and right are fixed to the top surface of the bottom plate (904); a U-shaped frame (906) is fixed to the top of the telescopic rod (905); a contact spring (907) is mounted on the outer peripheral wall of the telescopic rod (905); a scrubbing block (908) is fixed between the inner walls on the left and right sides of the U-shaped frame (906); and a motor (904) is fixed to the inner bottom wall of the tail of the hull (1). 09), a transmission bin (910) is fixed on the bottom surface of the hull (1) and directly below the motor (909), a rotating shaft (911) is fixed on the output shaft of the motor (909), the bottom end of which passes through the hull (1) and extends into the transmission bin (910), the rotating shaft (911) is rotatably connected to the hull (1), a threaded block (912) is fixed on the top surface of the bottom plate (904), a screw rod (913) is threadedly connected to the threaded block (912), one end of which passes through the transmission bin (910) and extends into the interior thereof, the screw rod (913) is rotatably connected to the transmission bin (910), a main bevel gear (914) is fixed on the bottom end of the rotating shaft (911), and a slave bevel gear (915) meshing with the main bevel gear (914) is fixed on the screw rod (913).

2. A ship gas drag reduction device according to claim 1, characterized in that: The U-shaped plate (2) is buckled between the bottom surface of the hull (1) and the hull (1) to form a rectangular hole that runs transversely through the hull, and the bubble plate (4) is gap-matched with the rectangular hole.

3. A ship gas drag reduction device according to claim 1, characterized in that: The plurality of straight grooves (7) are evenly divided into two groups. The plurality of straight grooves (7) in the same group are evenly distributed frontally and rearwardly. The two groups of straight grooves (7) are respectively located on the left and right sides of the transverse groove (6). A connecting pipe connected to the transverse groove (6) is fixed on the front side of the bubble plate (4).

4. A ship gas drag reduction device according to claim 1, characterized in that: The top ends of the two telescopic rods (905) are fixed on the same U-shaped frame (906), the scrubbing block (908) is a cloth block, and the threaded block (912) is provided with a threaded hole for the screw rod (913) to penetrate and be threadedly connected thereto.

5. A ship gas drag reduction device according to claim 1, characterized in that: The transmission chamber (910) is in the shape of a rectangular parallelepiped with a hollow interior and a missing top surface. The connection portion between the screw rod (913) and the transmission chamber (910) and the connection portion between the rotating shaft (911) and the hull (1) are both sealed and waterproof.

6. A ship gas drag reduction device according to claim 1, characterized in that: The limiting assembly (5) comprises two connecting plates (501) respectively fixed on the left and right sides of the U-shaped plate (2); the bottom surface of the U-shaped plate (2) is provided with a plurality of through holes (502) distributed on the left and right; the bottom surface of the bubble plate (4) is provided with a plurality of limiting grooves (503) distributed on the left and right; the top surface of the connecting plate (501) is slidably connected with a connecting rod (504) whose bottom end penetrates the connecting plate (501) and extends to the bottom thereof; a supporting plate (505) is fixed at the bottom end of the connecting rod (504); a plurality of limiting blocks (506) distributed on the left and right and respectively penetrating the plurality of through holes (502) are fixed on the top surface of the supporting plate (505); and a limiting spring (507) is sleeved on the outer peripheral wall of the connecting rod (504).

7. A ship gas drag reduction device according to claim 6, characterized in that: The top surface of the connecting plate (501) is provided with a guide hole for the connecting rod (504) to pass through and to fit with the connecting rod; the top end of the connecting rod (504) is fixed with a limit rod; the top end of the limit spring (507) is fixed on the limit rod, and the bottom end thereof is fixed on the connecting plate (501).

8. A ship gas drag reduction device according to claim 6, characterized in that: The through hole (502) and the limiting groove (503) are opposed to each other in upper and lower directions, and the limiting block (506) is clearance-matched with the through hole (502) and the limiting groove (503).

9. A ship gas drag reduction method for a ship gas drag reduction device according to any one of claims 6 to 8, characterized in that: The following steps are involved: S1, connecting the bubble plate (4) to the air source device on the hull (1) through a connecting pipe, starting the air source device and controlling the air source device; S2, delivering gas into the connecting pipe, so that the gas enters the bubble plate (4) and forms bubbles through the air jet holes (8), and the bubbles gather into an air film at the bottom of the hull (1); S3, driving the hull (1) to travel, when the jet hole (8) is blocked, starting the motor (909), the motor (909) drives the scrubbing block (908) to scrub the bottom surface of the bubble plate (4), remove the blockage on the bottom surface of the bubble plate (4), and ensure that a uniform air film can be generated on the bottom of the hull (1); S4, after the bubble plate (4) is cleaned, the motor (909) is turned off; S5. When the bubble plate (4) is corroded and damaged and needs to be replaced, the connection between the connecting pipe and the external air source device is removed, and the support plate (505) is pulled down. The support plate (505) drives the limit block (506) to move down and out of the limit groove (503), and the bubble plate (4) is pulled forward for replacement. After replacement, the installation is completed by reversing this operation.

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