Bow thruster mounting device, design method thereof and bow thruster system

Abstract

The invention belongs to the technical field of ships, and discloses a bow thruster mounting device, a design method thereof and a bow thruster system.The bow thruster mounting device is used for mounting a propeller of the bow thruster system and comprises a mounting barrel, and the mounting barrel penetrates through a ship body in the preset direction; the installation cylinder is provided with an inlet edge extending to the outer surface of one side of the ship body, the inlet edge is provided with a first arc-shaped chamfer, and the first arc-shaped chamfer is used for guiding fluid to enter the installation cylinder. The propulsive efficiency of the bow thruster system is guaranteed, fluid is not separated from the inner wall of the mounting barrel, so that a flow field is uniform, the non-uniform flow field is the main root cause of vibration and noise, harmful vibration and noise are reduced, and normal work of equipment and personnel on a ship and comfort of the personnel are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of cruise ships, and in particular to a bow thruster installation device and a design method thereof, and a bow thruster system. Background Art

[0002] Bow thruster, that is, bow thruster system device, is installed on the bow thruster of the ship to improve the maneuverability of the ship. Specifically, during the docking process of the cruise ship at the operating terminal, in order to dock effectively and accurately and smoothly dock at the dock mooring point, the cruise ship will involve multiple bow thruster systems, which can achieve lateral thrust by rotating the bow thruster system forward or reversely, and slowly adjust the docking posture of the cruise ship through speed control to achieve an accurate predetermined docking position. Usually, the bow thruster system includes power equipment such as motors and propellers. Through motor control, the forward or reverse rotation of the propeller can achieve lateral movement of the ship.

[0003] In the prior art, the bow thruster system is installed in a mounting tube, and the mounting tube is connected to the hull. The edge of the mounting tube in the prior art is provided with a planar section. However, due to the angularity between the edge of the mounting tube and the outer surface of the hull, the flow field is uneven when the fluid flows through this position, which in turn generates large vibrations and noise. The bow thruster area of ​​large cruise ships is often arranged with cabins such as living quarters, restaurants, conference rooms and driving cabs that are sensitive to vibrations. In order to avoid harmful vibrations and noise, ensure the normal operation of equipment and personnel on board, and personnel comfort, in addition to meeting various processes, bow thruster vibration reduction and noise reduction requirements should also be considered during the design of the bow thruster of the ship. Summary of the invention

[0004] The object of the present invention is to provide a bow thruster installation device and a design method thereof, and a bow thruster system, so as to solve the problems of high vibration and noise existing in the prior art.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] A bow thruster installation device is used to install a propeller of a bow thruster system, comprising an installation cylinder, which is arranged to penetrate the hull along a preset direction, and has an inlet edge extending to the outer surface of one side of the hull, and the inlet edge is provided with a first arc chamfer, and the first arc chamfer is used to guide fluid into the installation cylinder.

[0007] Preferably, the hull is provided with a mounting hole, the mounting cylinder is mounted in the mounting hole, the first port of the mounting cylinder is located on the first surface of the hull, and the surface where the first port is located is coplanar with the first surface, the second port of the mounting cylinder is located on the second surface of the hull, and the surface where the second port is located is coplanar with the second surface;

[0008] Alternatively, part of the hull forms the mounting cylinder.

[0009] Preferably, the transverse contour line of the first arc-shaped chamfer is a first contour line, and the radius of the circle where the first contour line is located is 250 mm to 350 mm.

[0010] Preferably, the transverse contour line of the first arc chamfer is a first contour line, the first contour line is arc-shaped, and a tangent line of the first contour line close to an end point of the inner wall of the installation cylinder is parallel to the axis of the installation cylinder;

[0011] The transverse cross-sectional profile of the surface of one side of the hull is an arc-shaped second contour line, the second contour line is connected to the first contour line, and the tangent of the second contour line close to one end point of the first contour line is the first tangent line, the tangent of the first contour line close to one end point of the second contour line is the second tangent line, and the first tangent line coincides with the second tangent line.

[0012] Preferably, the installation cylinder has an outlet edge extending to the other side surface of the hull, and the outlet edge is provided with a second arc chamfer, and the second arc chamfer is used to guide the fluid to flow out of the installation cylinder.

[0013] Preferably, the transverse contour line of the second arc chamfer is a third contour line, the third contour line is arc-shaped, and the tangent line of the third contour line close to one end of the inner wall of the installation cylinder is parallel to the axis of the installation cylinder;

[0014] The transverse cross-sectional profile of the other side surface of the hull is an arc-shaped fourth contour line, the fourth contour line is connected to the third contour line, and the tangent of the fourth contour line close to one end point of the third contour line is the third tangent, the tangent of the third contour line close to one end point of the fourth contour line is the fourth tangent, and the third tangent coincides with the fourth tangent.

[0015] Preferably, the bow thruster installation device further comprises a first flow guide member, the first flow guide member is streamlined, the first flow guide member is arranged on the inner wall of the installation cylinder, and one end of the first flow guide member extends to the inlet edge;

[0016] The installation cylinder has an outlet edge extending to the other side surface of the hull, and the bow thruster installation device also includes a second flow guide member, which is streamlined and arranged on the inner wall of the installation cylinder, and one end of the second flow guide member extends to the outlet edge.

[0017] A design method for a bow thruster installation device is used to design the bow thruster installation device as described above, and the design method for the bow thruster installation device comprises the following steps:

[0018] A mounting cylinder is formed on the hull, the mounting cylinder is arranged to penetrate the hull along a preset direction, and the mounting cylinder has an opening extending to the outer surface of one side of the hull;

[0019] The opening is chamfered to form an inlet edge with a first arc-shaped chamfer.

[0020] A bow thruster system, comprising the bow thruster installation device as described above, or comprising a bow thruster installation device designed according to the design method of the bow thruster installation device as described above;

[0021] The bow thruster system further comprises a power device and a propeller. The power device is mounted on the bow thruster mounting device and is used to drive the propeller to rotate. The propeller is arranged in the mounting cylinder.

[0022] Preferably, at least part of the power equipment is arranged in the installation cylinder, and the corners of the part of the power equipment located in the cylinder are provided with arc chamfers.

[0023] Beneficial effects of the present invention:

[0024] The bow thruster installation device and design method thereof, and the bow thruster system provided by the present invention have a mounting cylinder having an inlet edge extending to the outer surface of one side of the hull, and the inlet edge is provided with a first arc chamfer, the first arc chamfer is used to guide the fluid into the mounting cylinder, and the inlet edge has no ridge design, thereby optimizing the inlet edge, thereby reducing the separation of the fluid from the inner wall of the mounting cylinder under the action of the inlet edge, thereby ensuring the propulsion efficiency of the bow thruster system, because the fluid is not separated from the inner wall of the mounting cylinder, the flow field is more uniform, and the uneven flow field is the main source of vibration and noise, therefore, the present embodiment also reduces harmful vibration and noise, and ensures the normal operation of equipment and personnel on board, as well as the comfort of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0026] Figure 1 The structure diagram of a partial hull and a bow thruster installation device provided by an embodiment of the present invention is shown in FIG. Figure 1 ;

[0027] Figure 2 is a schematic structural diagram of a first arc chamfer of an inlet edge provided by an embodiment of the present invention;

[0028] Figure 3 is a partial structural schematic diagram of a bow thruster system provided by an embodiment of the present invention;

[0029] Figure 4 The structure diagram of a partial hull and a bow thruster installation device provided by an embodiment of the present invention is shown in FIG. Figure 2 ;

[0030] Figure 5 The structure diagram of a partial hull and a bow thruster installation device provided by an embodiment of the present invention is shown in FIG. Figure 3 ;

[0031] Figure 6 It is a partial structural schematic diagram of the bow thruster system in the prior art provided by the present invention;

[0032] Figure 7 It is a schematic diagram of the edge of the installation tube in the prior art provided by the present invention;

[0033] Figure 8 It is a flow field diagram of the fluid in and around the installation cylinder in the prior art provided by the present invention.

[0034] In the figure:

[0035] 1. Install the cylinder; 11. Inlet edge; 12. First arc chamfer; 121. First contour line; 13. Outlet edge; 14. Second arc chamfer; 141. Third contour line;

[0036] 10, hull; 101, second contour line; 102, fourth contour line; L1, first tangent line; L2, third tangent line; 20, section; 30, eddy region;

[0037] 100. Power equipment; 200. Propeller. DETAILED DESCRIPTION

[0038] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly stipulated and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0042] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0043] It should be noted that when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or there may be a central element.

[0044] In the prior art, such as Figures 6 to 8 As shown in the figure, the edge of the mounting tube is provided with a planar section 20, resulting in an angle between the edge of the mounting tube and the outer surface of the hull 10. When the fluid passes through the angle, under the action of the angle, the original design simulation results show that there is a large amount of flow separation at the bottom of the middle section of the side thrust hole. This separation may affect the torque fluctuation of the propeller 200, resulting in an uneven flow field and may also produce the following Figure 8 The vortex region 30 shown has vortices, which in turn generate a large amount of vibration and noise. Therefore, it is necessary to reduce flow separation by improving the shape of the side thrust hole inlet, thereby reducing the torque fluctuation of the propeller 200.

[0045] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0046] First, as Figures 1 to 4 As shown, this embodiment provides a bow thruster installation device for installing the propeller 200 of the bow thruster system, which can reduce vibration and noise, thereby ensuring the normal operation of the equipment and personnel on board, as well as the comfort of the personnel.

[0047] like Figure 1 As shown, the bow thruster installation device includes an installation cylinder 1. The installation cylinder 1 is arranged to penetrate the hull 10 along a preset direction. In some optional embodiments, the preset direction is Figure 1 The left and right directions shown may also be the left and right directions of the hull 10. In addition, the mounting cylinder 1 has an inlet edge 11 extending to the outer surface of one side of the hull 10. In this embodiment, the inlet edge 11 is annular, and the inlet edge 11 is provided with a first arc chamfer 12, that is, the corner of the inlet edge 11 is a circular arc chamfer. The first arc chamfer 12 is used to guide the fluid into the mounting cylinder 1, and the fluid contacts the first arc chamfer 12 when passing through the first arc chamfer 12.

[0048] The bow thruster installation device provided in the present embodiment has a mounting cylinder 1 having an inlet edge 11 extending to the outer surface of one side of the hull 10, and the inlet edge 11 is provided with a first arc chamfer 12, the first arc chamfer 12 is used to guide the fluid into the mounting cylinder 1, and the inlet edge 11 does not have a convex ridge design, thereby optimizing the inlet edge 11, thereby reducing the separation of the fluid from the inner wall of the mounting cylinder 1 under the action of the inlet edge 11, thereby ensuring the propulsion efficiency of the bow thruster system, and since the fluid is not separated from the inner wall of the mounting cylinder 1, the flow field is more uniform, and the uneven flow field is the main source of vibration and noise. Therefore, the present embodiment also reduces harmful vibration and noise, and ensures the normal operation of equipment and personnel on board, as well as the comfort of personnel.

[0049] In some optional embodiments, the hull 10 is provided with a mounting hole, and the mounting cylinder 1 is installed in the mounting hole, that is, the hull 10 and the mounting cylinder 1 are two independent structures, and the mounting cylinder 1 can be installed in the mounting hole of the hull 10 through multiple transportation and turning eye plates. The inlet edge 11 in this embodiment is arranged on the mounting cylinder 1, which avoids modification of the structure of the hull 10 and the modification is relatively small.

[0050] In the present embodiment, the first port of the mounting cylinder 1 is located on the first surface of the hull 10, and the surface where the first port is located is coplanar with the first surface, and the second port of the mounting cylinder 1 is located on the second surface of the hull 10, and the surface where the second port is located is coplanar with the second surface, so that the setting of the mounting cylinder 1 will not affect the line shape of the hull 10, thereby ensuring that the resistance of the hull 10 will not increase, and it is also convenient for the replacement of the mounting cylinder 1, with high flexibility and reliability.

[0051] Of course, it is understandable that the hull 10 and the mounting cylinder 1 can also be an integrated structure. For example, part of the hull 10 forms the mounting cylinder 1, thereby improving the integrity of the hull 10 and the mounting cylinder 1.

[0052] Exemplarily, the transverse contour line of the first arc chamfer 12 is the first contour line 121, and the radius of the circle where the first contour line 121 is located is 250 mm to 350 mm. For example, the radius of the circle where the first contour line 121 is located is 250 mm, 280 mm, 300 mm, 350 mm, etc., so that the setting of the first arc chamfer 12 is neither too large nor too small, thereby ensuring the flow guiding effect on the fluid and facilitating manufacturing.

[0053] Alternatively, if Figure 4 As shown, the transverse contour line of the first arc chamfer 12 is the first contour line 121. The first contour line 121 is arc-shaped, and the tangent line of the first contour line 121 close to one end point of the inner wall of the mounting cylinder 1 is parallel to the axis of the mounting cylinder 1, that is, the inner wall of the mounting cylinder 1 is the section 20 of the first contour line 121. By making the tangent line of the first contour line 121 close to one end point of the inner wall of the mounting cylinder 1 parallel to the axis of the mounting cylinder 1, the first arc chamfer 12 and the inner wall of the mounting cylinder 1 can be smoothly transitioned, thereby preventing the occurrence of convex edges at the connection between the first arc chamfer 12 and the inner wall of the mounting cylinder 1 that affect the fluid flow field, further reducing the generation of vibration and noise, and ensuring the propulsion efficiency of the bow thruster system. In this embodiment, the longitudinal contour line of the first arc chamfer 12 is a circular ring.

[0054] In some optional embodiments, please continue to see Figure 4, the transverse cross-sectional profile of one side surface of the hull 10 (i.e., the first surface) is an arc-shaped second contour line 101. The second contour line 101 is butted with the first contour line 121, and the tangent of the second contour line 101 close to one end point of the first contour line 121 is the first tangent line L1, and the tangent of the first contour line 121 close to one end point of the second contour line 101 is the second tangent line, and the first tangent line L1 coincides with the second tangent line. In this way, the first surface of the hull 10 and the first arc chamfer 12 can smoothly transition, thereby preventing the problem of convex edges appearing at the connection between the first arc chamfer 12 and the first surface to affect the fluid flow field and the line shape of the hull 10, further reducing the generation of vibration and noise, and ensuring the propulsion efficiency of the bow thruster system.

[0055] Exemplarily, the mounting cylinder 1 has an outlet edge 13 extending to the other side surface (i.e., the second surface) of the hull 10. The outlet edge 13 is provided with a second arc chamfer 14, that is, the corner of the outlet edge 13 is a circular arc chamfer. The second arc chamfer 14 is used to guide the fluid to flow out of the mounting cylinder 1, and when the fluid passes through the second arc chamfer 14, it contacts the second arc chamfer 14 to reduce the situation of increased vibration due to the generation of vortex.

[0056] In this embodiment, by setting the first arc chamfer 12 and the second arc chamfer 14, the flow of the fluid in the mounting cylinder 1 is improved and optimized, reducing the probability and amount of separation of the fluid from the inner wall of the mounting cylinder 1. Fluid separation will form backflow and cause blockage. Therefore, this embodiment reduces the separation of the fluid, thereby reducing the torque fluctuation of the propeller 200. On the one hand, it reduces the damage to the propeller 200 due to torque shifting and extends the service life of the propeller 200. On the other hand, it reduces the vibration and noise levels.

[0057] Further optionally, if Figure 4 As shown, the transverse contour line of the second arc chamfer 14 is the third contour line 141, the third contour line 141 is arc-shaped, and the tangent of the third contour line 141 close to one end of the inner wall of the mounting cylinder 1 is parallel to the axis of the mounting cylinder 1, so that the second arc chamfer 14 and the inner wall of the mounting cylinder 1 can smoothly transition, thereby preventing the occurrence of convex edges at the connection between the second arc chamfer 14 and the inner wall of the mounting cylinder 1 and affecting the fluid flow field, further reducing the generation of vibration and noise, and ensuring the propulsion efficiency of the bow thruster system. In this embodiment, the longitudinal contour line of the second arc chamfer 14 is a circular ring.

[0058] In some optional embodiments, the transverse cross-sectional profile of the other side surface of the hull 10 (i.e., the second surface mentioned above) is an arc-shaped fourth contour line 102. The transverse cross-sectional profile of the outlet edge 13 is a third contour line 141, the fourth contour line 102 is butted against the third contour line 141, and the tangent of the fourth contour line 102 close to one end point of the third contour line 141 is the third tangent line L2, the tangent of the third contour line 141 close to one end point of the fourth contour line 102 is the fourth tangent line, and the third tangent line L2 coincides with the fourth tangent line. This arrangement enables the second surface of the hull 10 to smoothly transition with the second arc chamfer 14, thereby preventing the occurrence of ridges at the connection between the second arc chamfer 14 and the second surface, which affects the fluid flow field and the line shape of the hull 10, further reducing the generation of vibration and noise, and ensuring the propulsion efficiency of the bow thruster system.

[0059] In some optional embodiments, such as Figure 5 As shown, the bow thruster installation device further includes a first flow guide. The first flow guide is streamlined, arranged on the inner wall of the installation cylinder 1, and one end of the first flow guide extends to the inlet edge 11. The first flow guide is used to guide the fluid entering the installation cylinder 1, so as to further reduce the probability of the fluid located downstream of the first flow guide being separated from the inner wall of the installation cylinder 1, reduce the backflow formed by the fluid separation, and reduce the probability of blockage, reduce the torque fluctuation of the propeller 200, and further reduce vibration and noise.

[0060] Exemplarily, the first flow guide may be annular and disposed on the inner wall of the mounting cylinder 1 , or a plurality of first flow guides may be provided, and the plurality of first flow guides are spaced apart along the circumference of the mounting cylinder 1 .

[0061] Exemplarily, when the installation cylinder 1 has an outlet edge 13 extending to the other side surface of the hull 10, the bow thruster installation device further includes a second flow guide (not shown in the figure), the second flow guide is streamlined, and the second flow guide is arranged on the inner wall of the installation cylinder 1 and is used for guiding the fluid, and one end of the second flow guide extends to the outlet edge 13. The cooperation between the first flow guide and the second flow guide can further improve the distribution of the flow field.

[0062] In a second aspect, the present embodiment provides a design method for a bow thruster installation device, which is used to design the bow thruster installation device of the first aspect, wherein the design method for the bow thruster installation device comprises the following steps:

[0063] S1. Forming a mounting cylinder 1 on the hull 10, the mounting cylinder 1 is arranged to penetrate the hull 10 along a preset direction, and the mounting cylinder 1 has an opening extending to the outer surface of one side of the hull 10;

[0064] S2. Chamfer the opening to form an inlet edge 11 having a first arc-shaped chamfer 12.

[0065] In step S1 , the installation cylinder 1 may be assembled on the hull 10 , or the installation cylinder 1 may be directly opened on the hull 10 , which is not limited in this embodiment.

[0066] In step S2 , a chamfering tool may be used to perform chamfering on the mounting cylinder 1 to obtain an inlet edge 11 .

[0067] The design method of the bow thruster installation device provided in the present embodiment is that the designed installation cylinder 1 has an inlet edge 11 extending to the outer surface of one side of the hull 10, and the inlet edge 11 is provided with a first arc chamfer 12, and the first arc chamfer 12 is used to guide the fluid into the installation cylinder 1. The inlet edge 11 does not have a convex ridge design, thereby optimizing the inlet edge 11, thereby reducing the separation of the fluid from the inner wall of the installation cylinder 1 under the action of the inlet edge 11, thereby ensuring the propulsion efficiency of the bow thruster system. Since the fluid is not separated from the inner wall of the installation cylinder 1, the flow field is more uniform, and the uneven flow field is the main source of vibration and noise. Therefore, the present embodiment also reduces harmful vibration and noise, and ensures the normal operation of equipment and personnel on board, as well as the comfort of personnel.

[0068] In a third aspect, the present embodiment provides a bow thruster system, comprising the bow thruster installation device as described in the first aspect, or comprising a bow thruster installation device designed according to the design method of the bow thruster installation device described in the second aspect.

[0069] like Figure 3 As shown, the bow thruster system further includes a power device 100 and a propeller 200. The power device 100 is installed on the bow thruster installation device and is used to drive the propeller 200 to rotate. The propeller 200 is arranged in the installation cylinder 1. The power device 100 in this embodiment can be a motor, etc., which is not limited in this embodiment.

[0070] In some optional embodiments, at least a portion of the power device 100 is disposed in the mounting cylinder 1. For example, the power device 100 includes a mounting seat, which is located in the mounting cylinder 1, and the corners of the portion of the power device 100 located in the cylinder (i.e., the mounting seat) are provided with arc chamfers to avoid the problem of more eddies being generated due to the 90-degree corners affecting the flow field of the fluid, thereby further reducing vibration and noise.

[0071] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A bow thruster installation device, used for installing a propeller (200) of a bow thruster system, It is characterized in that The invention comprises a mounting cylinder (1), wherein the mounting cylinder (1) is arranged to penetrate a hull (10) along a preset direction, and the mounting cylinder (1) has an inlet edge (11) extending to an outer surface of one side of the hull (10), and the inlet edge (11) is provided with a first arc chamfer (12), and the first arc chamfer (12) is used to guide fluid to enter the mounting cylinder (1).

2. The bow thruster mounting device according to claim 1, It is characterized in that The hull (10) is provided with a mounting hole, the mounting cylinder (1) is mounted in the mounting hole, a first port of the mounting cylinder (1) is located on a first surface of the hull (10), and the surface where the first port is located is coplanar with the first surface, and a second port of the mounting cylinder (1) is located on a second surface of the hull (10), and the surface where the second port is located is coplanar with the second surface; Alternatively, part of the hull (10) forms the mounting cylinder (1).

3. The bow thruster installation device according to claim 1, It is characterized in that The transverse contour line of the first arc chamfer (12) is a first contour line (121), and the radius of the circle where the first contour line (121) is located is 250 mm to 350 mm.

4. The bow thruster mounting device according to claim 1, It is characterized in that The transverse contour line of the first arc chamfer (12) is a first contour line (121), the first contour line (121) is arc-shaped, and the tangent line of the first contour line (121) close to one end of the inner wall of the installation cylinder (1) is parallel to the axis of the installation cylinder (1); The transverse cross-sectional profile of the surface of one side of the hull (10) is an arc-shaped second contour line (101), the second contour line (101) is connected to the first contour line (121), and the tangent of the second contour line (101) close to one end point of the first contour line (121) is a first tangent line (L1), and the tangent of the first contour line (121) close to one end point of the second contour line (101) is a second tangent, and the first tangent line (L1) coincides with the second tangent line.

5. The bow thruster mounting device according to claim 1, It is characterized in that The installation cylinder (1) has an outlet edge (13) extending to the other side surface of the hull (10), and the outlet edge (13) is provided with a second arc chamfer (14), and the second arc chamfer (14) is used to guide the fluid to flow out of the installation cylinder (1).

6. The bow thruster mounting device according to claim 5, It is characterized in that The transverse contour line of the second arc chamfer (14) is a third contour line (141), the third contour line (141) is arc-shaped, and the tangent line of the third contour line (141) close to one end of the inner wall of the installation cylinder (1) is parallel to the axis of the installation cylinder (1); The transverse cross-sectional profile of the other side surface of the hull (10) is an arc-shaped fourth contour line (102), the fourth contour line (102) is connected to the third contour line (141), and the tangent of the fourth contour line (102) close to one end point of the third contour line (141) is a third tangent (L2), the tangent of the third contour line (141) close to one end point of the fourth contour line (102) is a fourth tangent, and the third tangent (L2) coincides with the fourth tangent.

7. The bow thruster mounting device according to claim 1, It is characterized in that The bow thruster installation device further comprises a first flow guide member, the first flow guide member is streamlined, the first flow guide member is arranged on the inner wall of the installation cylinder (1), and one end of the first flow guide member extends to the inlet edge (11); The installation cylinder (1) has an outlet edge (13) extending to the other side surface of the hull (10), and the bow thruster installation device also includes a second flow guide member, which is streamlined and arranged on the inner wall of the installation cylinder (1), and one end of which extends to the outlet edge (13).

8. A method for designing a bow thruster installation device, used for designing a bow thruster installation device as claimed in any one of claims 1 to 7, It is characterized in that The design method of the bow thruster installation device comprises the following steps: A mounting cylinder (1) is formed on the hull (10), wherein the mounting cylinder (1) is arranged to penetrate the hull (10) along a preset direction, and the mounting cylinder (1) has an opening extending to the outer surface of one side of the hull (10); The opening is chamfered to form an inlet edge (11) having a first arc-shaped chamfer (12).

9. Bow thruster system, It is characterized in that A bow thruster installation device comprising the bow thruster installation device according to any one of claims 1 to 7, or a bow thruster installation device designed according to the design method of the bow thruster installation device according to claim 8; The bow thruster system further comprises a power device (100) and a propeller (200); the power device (100) is installed on the bow thruster installation device and is used to drive the propeller (200) to rotate; the propeller (200) is arranged in the installation cylinder (1).

10. The bow thruster system according to claim 9, It is characterized in that At least part of the power device (100) is arranged in the installation cylinder (1), and the corners of the part of the power device (100) located in the installation cylinder (1) are all provided with circular chamfers.

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