Parabolic rotary air funnel for ships

Abstract

The present application belongs to the field of ship technology, and discloses a parabolic rotary air duct for a ship. The parabolic rotary air duct for the ship comprises an air duct body, the air duct body is rotationally installed on a deck of the ship, the air duct body extends along a vertical direction, the air duct body is a rotary body, and a generatrix of the air duct body is a parabola. The parabola is used as the generatrix, so that the air duct body has a shape of a column body which is contracted towards two ends. Compared with a cylindrical air duct, the height of the air duct body is significantly reduced under the same thrust, the center of gravity of the air duct body is obviously reduced, the stability of the air duct body and the ship is increased, and the air duct body is easy to pass through a height-limited area. The air duct body has a smaller contact surface radius with the deck, so that the area occupied by the air duct body on the deck is reduced, and the air duct body is more easy to be arranged and operated in a port.

Description

Technical Field

[0001] This invention relates to the field of marine technology, and in particular to a parabolic rotating ventilation duct for ships. Background Technology

[0002] A rotary wind turbine is an energy-saving wind-powered propulsion device for ships. Utilizing the Magnus effect aerodynamic principle, it rotates and receives crosswinds perpendicular to the ship's direction of travel, generating a thrust in the same direction as the ship's movement, thus assisting in forward propulsion. Rotary wind turbines are simple in structure, easy to maintain, and highly feasible. The magnitude and direction of the thrust can be adjusted by changing its rotation speed and direction under different wind angles.

[0003] Rotary ventilation ducts were first installed on the German ship Buckau in 1924, but their poor economic performance prevented widespread adoption. However, with the depletion of oil resources and the increasing demand for energy conservation, rotary ventilation ducts have seen a resurgence in application. Over the years, numerous domestic and international shipping companies have used rotary ventilation ducts on various types of vessels, reducing fuel consumption by 5% to 30% and lowering emissions of harmful substances. The thrust generated by the rotary ventilation duct is related not only to the ship's speed and the duct's rotational speed but also closely to its aerodynamic shape. Currently, most rotary ventilation ducts are cylindrical in shape, resulting in significant height, which negatively impacts ship stability and hinders passage through height-restricted areas; they also occupy a large deck area, affecting the arrangement of other deck equipment and port operations. Therefore, there is an urgent need for a parabolic rotary ventilation duct for ships to address these issues. Summary of the Invention

[0004] The purpose of this invention is to provide a parabolic rotating ventilation duct for ships, in order to solve the problems of existing ventilation ducts being too high, having a significant impact on ship stability, affecting passage and operations, and occupying a large amount of deck area.

[0005] Based on the above concept, the technical solution adopted by this invention is as follows:

[0006] A parabolic rotating duct for ships includes: a duct body, which is rotatably mounted on the deck of a ship, the duct body extends vertically, the duct body is a rotating body, and the generatrix of the duct body is a parabola.

[0007] Furthermore, the duct body includes a first end face, a second end face, and a side face connected between the first end face and the second end face, which are disposed opposite to each other in the axial direction of the duct body.

[0008] Furthermore, the vertex of the generatrix of the duct body and the midpoint of the axis of the duct body are on the same horizontal plane.

[0009] Furthermore, the generatrix of the duct body comprises two parabolic segments, which originate from the vertex of the generatrix of the duct body and extend to the first end face and the second end face, respectively.

[0010] Furthermore, the radius of the first end face and the radius of the second end face are both a, and the distance between the vertex of the generatrix of the duct body and the axis of the duct body is b, where a < b ≤ a + 1.

[0011] Furthermore, the air duct body is mounted on the deck via a base, and the air duct body is rotatably mounted on the base.

[0012] Furthermore, the parabolic rotating duct for ships also includes a rotating component, one end of which is connected to the duct body and the other end of which is connected to the deck via the base.

[0013] Furthermore, the generatrix of the duct body comprises two parabolic segments. In the vertical direction, the vertices of the two parabolic segments are higher or lower than the midpoint of the axis of the duct body, and extend to the first end face and the second end face respectively; the diameter of the first end face and the diameter of the second end face are the same or different.

[0014] The beneficial effects of this invention are:

[0015] This invention provides a parabolic rotating duct for ships, comprising a duct body rotatably mounted on the ship's deck. The duct body extends vertically and is a rotating body with a parabolic generatrix, resulting in a cylindrical shape that tapers at both ends. Compared to a cylindrical duct, this significantly reduces the height of the duct body while generating the same thrust, thus lowering its center of gravity and increasing the stability of both the duct body and the ship. It also facilitates passage through height-restricted areas. Furthermore, the smaller radius of the duct body's contact surface with the deck reduces the deck area occupied, making it easier to install and operate in ports. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a parabolic rotating duct for ships provided in an embodiment of the present invention.

[0018] In the picture:

[0019] 1. Air duct body; 2. First end face; 3. Second end face; 4. Base; 5. Deck. Detailed Implementation

[0020] 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 will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0024] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0025] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or it can be located in between the component.

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] This embodiment provides a parabolic rotating duct for ships. The height of the parabolic rotating duct is significantly reduced, and the center of gravity of the duct body is lowered, which increases the stability of the duct itself and the ship. It is also easier to pass through height-restricted areas, and the area occupied on the deck is reduced, making it easier to install and operate in the port.

[0028] like Figure 1 As shown, the parabolic rotating duct for ships includes a duct body 1, which is rotatably mounted on the deck 5 of the ship. The duct body 1 extends vertically and is a rotating body. The generatrix of the duct body 1 is a parabola. It can be understood that by using a parabola as the generatrix, the duct body 1 is shaped like a cylinder that tapers towards both ends. Compared to a cylindrical duct, under the same thrust, the height of the duct body 1 is significantly reduced, and the center of gravity is also significantly lowered, increasing the stability of both the duct body 1 and the ship, and facilitating passage through height-restricted areas. Furthermore, the radius of the contact surface between the duct body 1 and the deck 5 is smaller, reducing the area of ​​the end face in contact with the deck 5, thereby reducing the area occupied by the duct body 1 on the deck 5, facilitating its placement and port operations.

[0029] Furthermore, the duct body 1 includes a first end face 2, a second end face 3, and a side surface (not shown in the figure) arranged opposite each other along the axial direction (i.e., the vertical direction) of the duct body 1. Specifically, in the vertical direction, the first end face 2 is located at the top of the duct body 1, and the second end face 3 is located at the bottom of the duct body 1. The duct body 1 is enclosed by the first end face 2, the second end face 3, and the side surface between the first end face 2 and the second end face 3. In other words, the duct body 1 is enclosed by a curved surface formed by rotating the first end face 2, the second end face 3, and the generatrix of the duct body 1 by 360°. The specific definition of the rotating body will not be elaborated in this embodiment.

[0030] Furthermore, the vertex O (or D) of the generatrix of the duct body 1 is on the same horizontal plane as the midpoint C of the axis of the duct body 1. In other words, in the vertical direction, the vertex O (or D) of the generatrix and the midpoint C of the axis of the duct body 1 are at the same height, that is, the diameter of the horizontal section at the midpoint C of the axis of the duct body 1 is the largest, and the duct body 1 is symmetrically arranged vertically with respect to the horizontal section at C.

[0031] For example, the generatrix of the wind duct body 1 includes two parabolic segments. These two parabolic segments originate from the vertex O (or D) of the generatrix of the wind duct body 1 and extend to the first end face 2 and the second end face 3, respectively. Specifically, the intersection point of the generatrix of the wind duct body 1 and the first end face 2 is B, and the intersection point of the generatrix of the wind duct body 1 and the second end face 3 is F. It can be understood that by setting two parabolic segments to form the generatrix of the wind duct body 1, and ensuring that the area at both ends of the parabolic rotating wind duct for ships is smaller than the horizontal cross-sectional area and design thrust at the middle position, the wind can smoothly transition along the entire side of the wind duct body 1 in the vertical direction, thereby improving operational stability.

[0032] Of course, in other embodiments, the duct body 1 can be designed as two asymmetrical upper and lower segments. In other words, the vertex O (or D) of the generatrix of the duct body 1 and the midpoint C of the axis of the duct body 1 may not be on the same horizontal plane. For example, in the vertical direction, the vertices of the two parabolas may be higher or lower than the midpoint of the axis of the duct body 1, and extend to the first end face 2 and the second end face 3 of equal diameter, respectively. Of course, the diameters of the first end face 2 and the second end face 3 may also be different, and the vertices of the two parabolas may, but are not limited to, be at the same height as the midpoint of the axis of the duct body 1.

[0033] Furthermore, the radius of the first end face 2 and the radius of the second end face 3 are both 'a', and the distance between the vertex O (or D) of the generatrix of the duct body 1 and the axis of the duct body 1 is 'b', where a < b ≤ a + 1. Specifically, the intersection point of the axis of the duct body 1 and the first end face 2 is A, the intersection point of the axis of the duct body 1 and the second end face 3 is E, the distances between AB and EF are both 'a', and the distance between CD is 'b'. It can be understood that by limiting the radius 'b' at the midpoint C of the axis of the duct body 1 by the size of the radius 'a' of the first end face 2, it is possible not only to ensure that the diameter of the duct body 1 is large in the middle and small at both end faces, but also to avoid the radius 'b' at the midpoint of the axis of the duct body 1 being too large, thus avoiding unreasonable phenomena in actual use.

[0034] For example, the radius of the first end face 2 and the radius of the second end face 3 are both 2m, and the radius at the midpoint of the axis of the duct body 1 is 3m. The radius at the midpoint of the axis of the duct body 1 is greater than the radius of the first end face 2 and the radius of the second end face 3.

[0035] Furthermore, the distance from the midpoint C of the axis of the duct body 1 to either the first end face 2 (A) or the second end face 3 (E) is h. Taking the vertex O of the generatrix of the duct body 1 as the origin of the two-dimensional coordinate system XOZ, the horizontal axis X is along the radial direction of the duct body 1, pointing positively towards the center of the duct body 1, and the vertical axis Z is along the height direction (i.e., the vertical direction) of the duct body 1, pointing positively towards the first end face 2 of the duct body 1, satisfying equation Z...2 =h 2 X is a segment of a parabola, where 0≤X≤1, and Z is the vertical distance from the X-axis to a point on the generatrix of the duct body 1.

[0036] Taking a cylindrical rotating duct of a certain size and the parabolic rotating duct for ships provided in this embodiment that generates equivalent thrust as examples, the beneficial effects of the present invention are explained. The duct parameters are shown in the table below.

[0037]

[0038] As shown in the table above, the main body of the cylindrical rotating air duct is cylindrical, with both the upper and lower end radius being 2.5m and the height being 40m.

[0039] The parabolic rotating duct for ships provided in this embodiment has a generatrix equation of Z. 2 =16 2 According to the parabolic equation, when X=0.5 (where the horizontal cross-sectional radius is the same as the radius of the cylindrical rotating wind tunnel, which is 2.5m), Z=11.31m. That is, in this embodiment, in the vertical direction, all the horizontal cross-sectional radii of the parabolic rotating wind tunnel for ships within a range of less than 11.31m from the midpoint C of the axis of the wind tunnel body 1 are greater than the radius of the cylindrical wind tunnel (2.5m). Under the same wind speed and wind tunnel rotation speed, each radius can generate a relatively larger linear velocity, thereby generating more thrust. Under the given parameters of the cylindrical and parabolic rotating wind tunnels, the parabolic rotating wind tunnel, by changing the shape of its main body, significantly reduces the height (from 40 meters to 32 meters, a reduction of 20%), reduces the upper and lower end radius (from 2.5 meters to 2 meters, a reduction of 20%), and increases the thrust by increasing the radius of the middle section. The overall thrust generated is comparable to that of the cylindrical wind tunnel. Because the height of the parabolic rotating duct is reduced, the center of gravity of the duct is effectively lowered, increasing stability; the radius of the lower end face is reduced, which can reduce the area occupied by deck 5 and make it easier to arrange.

[0040] Furthermore, the air duct body 1 is mounted on the deck 5 via the base 4 to prevent the air duct body 1 from rubbing against the deck 5 during rotation, thus avoiding affecting the rotation of the air duct body 1 and preventing wear on the deck 5.

[0041] Furthermore, the parabolic rotating duct for ships also includes a rotating component (not shown in the figure). One end of the rotating component is connected to the duct body 1, and the other end is connected to the deck 5 via the base 4. Specifically, one end of the rotating component can move relative to the other end. The end of the duct body 1 facing away from the first end face 2 has a mounting hole along its axial direction. One end of the rotating component is located in the mounting hole and connected to the duct body 1. The other end of the rotating component is fixed to the end of the base 4 facing away from the deck 5. It can be understood that when wind blows towards the parabolic rotating duct for ships, one end of the rotating component and the duct body 1 can rotate relative to the other end of the rotating component, thereby realizing the rotation of the parabolic rotating duct for ships.

[0042] For example, the rotating component can be a rotating shaft, with one end of the shaft located in the mounting hole and connected to the duct body 1, and the other end of the shaft connected to the end of the base 4 facing away from the deck 5, thereby satisfying the requirement that when wind blows towards the parabolic rotating duct of the ship, the duct body 1 can rotate relative to the deck 5. The specific structure of the rotating shaft is prior art, and will not be described in detail in this embodiment.

[0043] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A parabolic rotating ventilation duct for ships, characterized in that, Includes a duct body (1), which is rotatably mounted on the deck (5) of a ship. The duct body (1) extends vertically and is a rotating body. The generatrix of the duct body is a parabola. The duct body (1) includes a first end face (2), a second end face (3) disposed opposite to each other in the axial direction of the duct body (1), and a side surface connected between the first end face (2) and the second end face (3); The vertex of the generatrix of the duct body (1) and the midpoint of the axis of the duct body (1) are on the same horizontal plane. The generatrix of the duct body (1) includes two parabolic segments. The two parabolic segments start from the vertex of the generatrix of the duct body (1) and extend to the first end face (2) and the second end face (3) respectively. The radius of the first end face (2) and the radius of the second end face (3) are both a. The distance between the midpoint of the generatrix of the duct body (1) and the axis of the duct body (1) is b, where a < b ≤ a + 1.

2. The parabolic rotating ventilation duct for ships according to claim 1, characterized in that, The air duct body (1) is mounted on the deck (5) via a base (4), and the air duct body (1) is rotatably mounted on the base (4).

3. The parabolic rotating ventilation duct for ships according to claim 2, characterized in that, The parabolic rotating duct for ships also includes a rotating component, one end of which is connected to the duct body (1), and the other end is connected to the deck (5) through the base (4).

4. The parabolic rotating ventilation duct for ships according to claim 3, characterized in that, The rotating component is a rotating shaft.

5. The parabolic rotating ventilation duct for ships according to claim 1, characterized in that, The diameter of the first end face (2) is the same as or different from the diameter of the second end face (3).

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