Energy-saving conduit

Abstract

The invention provides an energy-saving guide pipe which is installed on the upstream portion of a propeller on the tail portion of a ship body, the energy-saving guide pipe comprises a nearly-semi-ring-shaped pipe assembly, the pipe assembly comprises a main body part and an extension part, the main body part is located in the middle of the pipe assembly in the circumferential direction, and the extension part is located in the middle of the pipe assembly in the circumferential direction. The two ends of the main body part in the circumferential direction extend outwards to form extension parts. According to the energy-saving guide pipe, the main body part and the extension parts in the pipe assembly are integrally arranged, so that the structure of the pipe assembly is relatively complete, the extension parts are formed by extending the two ends of the main body part in the circumferential direction, and the pipe assembly is installed in an offset mode, so that the wake flow of a stern can be improved, the power received by a propeller is reduced, and the energy-saving effect is finally achieved; wherein the pipe assembly replaces the rectification effect of part of the guide vanes, so that the number of the guide vanes is reduced, and the manufacturing cost and the maintenance and repair difficulty of the energy-saving guide pipe are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of energy-saving conduits, and in particular to an energy-saving conduit. Background Art

[0002] In the context of reducing carbon emissions in ship operations, energy-saving ducts have become the mainstream energy-saving equipment on the market with their obvious energy-saving effects and convenient modification methods. However, the inflow angles of each component of the energy-saving duct have a significant impact on its energy-saving effect. The level of production and installation manufacturers directly affects the operational energy-saving effect of the energy-saving duct.

[0003] The energy-saving catheter shapes currently under development are as follows: Figure 5 and 6 As shown, it can be roughly divided into "conventional duct" and "ray-type duct", both of which are composed of a duct structure and more than three guide vanes. In the design stage, the inflow angles of multiple guide vanes need to be finely set. However, in the production stage, due to the limitations of the processing and installation environment, the installation accuracy of the above-mentioned design variables will be affected, which in turn affects the actual operation effect of the ship.

[0004] It can be seen that the above existing energy-saving conduits have the following disadvantages:

[0005] Complex structure: Energy-saving ducts on the market are usually composed of multiple ducts and more than three guide vanes, which not only increases the manufacturing cost, but also increases the difficulty of maintenance and repair;

[0006] Complex installation and positioning: The inflow angle of each component has a significant impact on the energy-saving effect of the energy-saving duct. Therefore, the installation of the duct must have high precision. However, the actual installation site environment is simple, which makes it difficult to control the posture of the duct.

[0007] Therefore, in order to solve the above problems, the present invention proposes an energy-saving conduit that can reduce manufacturing costs and the difficulty of maintenance and repair, and can also reduce the difficulty of installation. Summary of the invention

[0008] In order to solve the technical problems existing in the above-mentioned existing energy-saving conduits, the present invention provides an energy-saving conduit.

[0009] According to one object of the present invention, the present invention provides an energy-saving duct, which is installed upstream of a propeller at the rear of a hull, and comprises:

[0010] A pipe assembly in a nearly semi-circular shape, comprising a main body and an extension, wherein the main body is located in the middle of the pipe assembly in the circumferential direction, and both ends of the main body extend outwardly to form extensions, and the ends of the extensions are respectively connected to the port side and the starboard side of the stern of the hull, and a deflection angle is set between the axis of the pipe assembly and the mid-longitudinal section of the hull;

[0011] A guide vane, wherein an angle of attack is set between the guide vane and the stern wake, and the guide vane is connected between the tube assembly and the stern of the hull.

[0012] Preferably, the offset distance between the axis of the tube assembly and the axis of the stern of the hull ranges from 0.15 times to 0.45 times the radius of the propeller at the stern of the hull.

[0013] Preferably, the deflection angle between the axis of the tube assembly and the longitudinal section of the hull is not greater than 15°.

[0014] Preferably, the radial cross-section of the tube assembly is in the shape of a fan ring, and the angle of the fan ring is not less than 90°.

[0015] Preferably, the number of the guide vanes does not exceed 3, and adjacent guide vanes are arranged at intervals along the circumferential direction of the tube assembly.

[0016] Preferably, the two radial side surfaces of the tube assembly are respectively an inner side surface and an outer side surface, the radial cross-sectional dimension of the outer side surface of the tube assembly gradually decreases as it approaches the propeller at the rear of the hull, and the radial cross-sectional dimension of the inner side surface of the tube assembly gradually increases as it approaches the axial ends of the tube assembly.

[0017] Preferably, the guide vane includes: a light guide vane, one end of the light guide vane in the length direction is connected to the stern of the hull located inside the tube assembly, and the other end of the light guide vane in the length direction passes through the tube assembly to the radially outer side of the tube assembly.

[0018] Preferably, the guide vane further comprises: a conventional guide vane, one end of which in the length direction is connected to the stern of the hull located inside the tube assembly, and the other end of which in the length direction is connected to the tube assembly.

[0019] Preferably, the radial cross-section of the tube assembly is fan-shaped, the angle of the fan-shaped is close to 90°, the guide vanes include two conventional guide vanes and one ray guide vane, and in the circumferential direction of the tube assembly, one conventional guide vane is respectively provided on both sides of the ray guide vane.

[0020] Preferably, the guide vane is connected to the central position of the tube assembly in the axial direction, and in the axial direction of the tube assembly, the end of the tube assembly and the end of the guide vane are spaced apart;

[0021] One end of the conventional guide vane connected to the tube assembly extends to the inner side of the tube wall of the tube assembly, and one end of the conventional guide vane connected to the tube assembly is flush with the outer side surface of the tube assembly.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The energy-saving duct makes the structure of the pipe assembly relatively complete by integrally arranging the main body and the extension part in the pipe assembly, and forms the extension part by extending the two ends of the main body in the circumferential direction, and offsets the pipe assembly, and sets a deflection angle between the pipe assembly and the mid-longitudinal section of the hull, so that the water flow entering the propeller disc surface is accelerated and pre-swirled, which can improve the wake at the stern, reduce the power received by the propeller, and finally achieve energy-saving effect;

[0024] The tube assembly replaces part of the guide vane's rectifying effect, thereby reducing the number of guide vanes, thereby reducing the manufacturing cost of the energy-saving duct and the difficulty of maintenance and repair;

[0025] The end of the extension part is in direct contact with the hull, which makes the installation of the energy-saving duct relatively simple. The energy-saving duct with fewer components has fewer welding areas, which can reduce the installation difficulty and welding deformation risk of the energy-saving duct.

[0026] The present invention is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of an energy-saving conduit as a whole according to the present invention from one viewing angle;

[0028] Figure 2 Another schematic diagram of the energy-saving conduit as a whole according to the present invention from another viewing angle;

[0029] Figure 3 It is a cross-sectional schematic diagram of an energy-saving conduit according to the present invention;

[0030] Figure 4 It is a schematic diagram of one embodiment of an energy-saving duct guide vane according to the present invention;

[0031] Figure 5 It is a schematic diagram of a "ray-type catheter" of the prior art;

[0032] Figure 6 It is a schematic diagram of a “conventional catheter” in the prior art. DETAILED DESCRIPTION

[0033] The following description is used to fully explain the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0034] See also Figure 1-4 The present invention provides a technical solution: an energy-saving conduit, comprising:

[0035] The energy-saving duct is installed upstream of the propeller 100 at the stern of the hull, and is characterized in that the energy-saving duct includes:

[0036] A pipe assembly 200 in a nearly semi-circular shape, comprising a main body 201 and an extension 202, wherein the main body 201 is located in the middle of the pipe assembly 200 in the circumferential direction, and both ends of the main body 201 in the circumferential direction extend outward to form the extension 202, and the ends of the extension 202 are respectively connected to the port side and the starboard side of the stern 100 of the hull, and a deflection angle is set between the axis of the pipe assembly 200 and the mid-longitudinal section of the hull;

[0037] The guide vane 300 has an attack angle set between the guide vane 300 and the stern wake, and the guide vane 300 is connected between the pipe assembly 200 and the stern 100 of the hull.

[0038] The energy-saving duct makes the structure of the pipe assembly 200 relatively complete by integrally arranging the main body 201 and the extension 202 in the pipe assembly 200, and forms the extension 202 by extending the two ends of the main body 201 in the circumferential direction, and offsets the pipe assembly 200, and sets a deflection angle between the pipe assembly 200 and the mid-longitudinal section of the hull, so that the water flow entering the propeller disk surface is accelerated and pre-swirled, which can improve the wake of the stern 100 of the hull, reduce the power received by the propeller, and finally achieve energy-saving effect;

[0039] The pipe assembly 200 replaces part of the guide vanes for rectifying effect, reducing the number of guide vanes, thereby reducing the manufacturing cost of the energy-saving duct and the difficulty of maintenance and repair;

[0040] The end of the extension part 202 is in direct contact with the hull, making the energy-saving duct relatively simple to install. The energy-saving duct with fewer components has fewer welding areas, which can reduce the installation difficulty and welding deformation risk of the energy-saving duct.

[0041] Further, the two radial side surfaces of the pipe assembly 200 are respectively the inner side surface 200a and the outer side surface 200b, the radius of the pipe assembly 200 gradually decreases from the water inlet to the outlet, that is, the pipe assembly 200 is approximately a nozzle shape, and the cross-section of the pipe assembly 200 is an airfoil profile. In other words, the radial cross-sectional size of the outer side surface 200b of the pipe assembly 200 gradually decreases in a manner close to the propeller of the stern 100 of the hull, and the radial cross-sectional size of the inner side surface 200a of the pipe assembly 200 gradually increases in a manner close to the axial ends of the pipe assembly 200, that is, the inner wall thickness of the pipe assembly 200 at the axial ends is less than the thickness at the axial middle position. Further, the two axial ends of the pipe assembly 200 are respectively the first end and the second end, the first end is close to the propeller of the stern 100 of the hull, and the angle between the inner side surface 200a of the first end and the outer side surface 200b of the first end is not greater than the angle between the inner side surface 200a of the second end and the outer side surface 200b of the second end. Preferably, the angle between the first end inner side surface 200a and the first end outer side surface 200b is smaller than the angle between the second end inner side surface 200a and the second end outer side surface 200b.

[0042] Furthermore, the offset distance between the axis of the tube assembly 200 and the axis of the stern 100 of the hull is in the range of 0.15 to 0.45 times the radius of the propeller of the stern 100 of the hull.

[0043] Furthermore, the deflection angle between the axis of the tube assembly 200 and the longitudinal section of the hull is not greater than 15°.

[0044] Furthermore, the radial cross section of the tube assembly 200 is in the shape of a fan ring, and the angle of the fan ring is not less than 90°.

[0045] Further, the number of the guide vanes 300 does not exceed 3, and adjacent guide vanes 300 are arranged at intervals along the circumference of the tube assembly 200. Preferably, the number of the guide vanes 300 is 2 to 3.

[0046] The guide vane 300 includes: a light guide vane 301, one end of the light guide vane 301 in the length direction is connected to the hull tail 100 located inside the tube assembly 200, and the other end of the light guide vane 301 in the length direction passes through the tube assembly 200 to the radial outer side of the tube assembly 200.

[0047] The guide vane 300 further includes: a conventional guide vane 302, one end of the conventional guide vane 302 in the length direction is connected to the hull tail 100 located inside the pipe assembly 200, and the other end of the conventional guide vane 302 in the length direction is connected to the pipe assembly 200.

[0048] In one embodiment, see Figure 4 The number of the guide vanes 300 is 3, the radial cross-section of the tube assembly 200 is fan-shaped, the angle of the fan-shaped is close to 90°, the guide vanes 300 include two conventional guide vanes 302 and one light guide vane 301, and in the circumferential direction of the tube assembly 200, one conventional guide vane 302 is respectively arranged on both sides of the light guide vane 301.

[0049] In another embodiment, see Figure 1-3 , so the guide vane 300 includes a light guide vane 301 .

[0050] It should be noted that the existing ray-type duct, that is, the energy-saving duct with the guide vane extending out of the duct structure, is a cantilever beam structure, and the probability of vibration during the operation of the ship is relatively high, which will damage the duct and even cause the duct to fall off. The energy-saving duct proposed in the present technical solution, on the one hand, replaces part of the guide vane function through the extension part 202, and has a smaller number. On the other hand, the end of the extension part 202 is directly connected to the hull, thereby improving the overall stability performance and avoiding vibration during the operation of the ship.

[0051] Preferably, the light guide vanes 301 are correspondingly arranged on the main body 201 .

[0052] In order to improve the stability of the energy-saving duct, further, the guide vane 300 is connected to the central position of the tube assembly 200 in the axial direction, and the end of the tube assembly 200 and the end of the guide vane 300 are arranged at intervals in the axial direction of the tube assembly 200. Further, one end of the conventional guide vane 302 connected to the tube assembly 200 extends to the inner side of the tube wall of the tube assembly 200, and further, one end of the conventional guide vane 302 connected to the tube assembly 200 is flush with the outer side surface 200b of the tube assembly 200. A stable connection between the guide vane 300 and the tube assembly 200 is achieved, wherein the interval between the end of the tube assembly 200 and the end of the guide vane 300 can provide support for the relative position of the two in the axial direction of the tube assembly 200. Further, one end of the extension part 202 connected to the stern 100 of the hull extends to the inner side of the stern 100, and one end of the guide vane 300 connected to the stern 100 of the hull extends to the inner side of the stern 100. To ensure the stability of the connection between the energy-saving duct and the hull. Preferably, the pipe assembly 200 and the stern 100 of the hull are welded and fixed, and the pipe assembly 200 is an integrated design.

[0053] In summary, the axis of the tube assembly 200 and the axis of the stern are arranged eccentrically, and the end of the tube assembly 200 is directly welded to the hull. The tube assembly 200 can play a certain role in guiding flow, thereby replacing the guide vanes 300 located on the left and starboard sides; the guide vanes 300 generate pre-swirl in the opposite direction of the propeller rotation upstream of the propeller. The tube assembly 200 and the guide vanes 300 in the energy-saving duct work together to improve the stern wake, reduce the power received by the propeller, and ultimately achieve an energy-saving effect.

[0054] The entire energy-saving duct structure is streamlined, which greatly improves the production and processing efficiency of the duct. In addition, the number of guide vanes 300 is reduced, so that the cantilever beam structure of the extended tube assembly 200 is limited, which can effectively weaken the energy-saving duct vibration caused by wake flow, propellers, etc., and extend the service life of the energy-saving duct.

[0055] The embodiments described above are only used to illustrate the technical ideas and features of the present invention, and their purpose is to enable technicians in this field to understand the contents of the present invention and implement them accordingly. The patent scope of the present invention cannot be limited only by this embodiment, that is, any equivalent changes or modifications made according to the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. An energy-saving duct installed upstream of a propeller at the stern of a ship (100), characterized in that: The energy-saving conduit comprises: A pipe assembly (200) in a nearly semi-circular shape, the pipe assembly (200) comprising a main body (201) and an extension (202), the main body (201) being located in the middle of the pipe assembly (200) in the circumferential direction, two ends of the main body (201) in the circumferential direction extending outward to form an extension (202), the ends of the extension (202) being respectively connected to the port side and the starboard side of the stern (100) of the hull, and a deflection angle being arranged between the axis of the pipe assembly (200) and the mid-longitudinal section of the hull; A guide vane (300) is connected between the tube assembly (200) and the stern of the ship hull (100), and an angle of attack is set between the guide vane (300) and the stern wake.

2. An energy-saving conduit according to claim 1, characterized in that: The offset distance between the axis of the tube assembly (200) and the axis of the stern (100) of the hull is in the range of 0.15 to 0.45 times the radius of the propeller of the stern (100) of the hull.

3. An energy-saving conduit according to claim 1, characterized in that: The deflection angle between the axis of the pipe assembly (200) and the longitudinal section of the hull is not greater than 15°.

4. An energy-saving conduit according to claim 1, characterized in that: The radial cross section of the tube assembly (200) is in the shape of a fan ring, and the angle of the fan ring is not less than 90°.

5. An energy-saving duct according to claim 4, characterized in that: The number of the guide vanes (300) does not exceed three, and adjacent guide vanes (300) are arranged at intervals along the circumferential direction of the tube assembly (200).

6. An energy-saving conduit according to claim 1, characterized in that: The two radial side surfaces of the tube assembly (200) are respectively an inner side surface (200a) and an outer side surface (200b); the radial cross-sectional dimension of the outer side surface (200b) of the tube assembly (200) gradually decreases in a manner close to the propeller at the stern of the hull (100), and the radial cross-sectional dimension of the inner side surface (200a) of the tube assembly (200) gradually increases in a manner close to the axial ends of the tube assembly (200).

7. An energy-saving duct according to claim 5, characterized in that: The guide vane (300) comprises: a light guide vane (301), one end of the light guide vane (301) in the length direction is connected to the hull tail (100) located inside the tube assembly (200), and the other end of the light guide vane (301) in the length direction passes through the tube assembly (200) to the radial outer side of the tube assembly (200).

8. An energy-saving duct according to claim 7, characterized in that: The guide vane (300) further comprises: a conventional guide vane (302), one end of the conventional guide vane (302) in the length direction being connected to the hull stern (100) located inside the pipe assembly (200), and the other end of the conventional guide vane (302) in the length direction being connected to the pipe assembly (200).

9. An energy-saving duct according to claim 8, characterized in that: The radial cross-section of the tube assembly (200) is in the shape of a fan ring, and the angle of the fan ring is close to 90 degrees. The guide vane (300) comprises two conventional guide vanes (302) and one light guide vane (301). In the circumferential direction of the tube assembly (200), one conventional guide vane (302) is respectively arranged on both sides of the light guide vane (301).

10. An energy-saving duct according to claim 8, characterized in that: The guide vane (300) is connected to the central position of the tube assembly (200) in the axial direction, and in the axial direction of the tube assembly (200), the end of the tube assembly (200) and the end of the guide vane (300) are arranged at intervals; One end of the conventional guide vane (302) connected to the tube assembly (200) extends to the inner side of the tube wall of the tube assembly (200), and one end of the conventional guide vane (302) connected to the tube assembly (200) is flush with the outer side surface (200b) of the tube assembly (200).

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