Offset type paddle front energy-saving device

Abstract

The utility model discloses an offset type propeller front energy-saving device which comprises an offset type circumferential guide vane and a plurality of radial guide vanes, the offset type circumferential guide vane is provided with an offset circle center, the offset circle center deviates from the axis of a propeller, and the radial guide vanes are arranged at intervals in the circumferential direction and fixedly connected with a ship body. The offset type circumferential guide vane is located above the horizontal plane where the axis of the propeller is located and does not exceed the boundary swept by the outer edge of the rotating propeller; when the propeller is a right-handed propeller, the offset circle center is located on the upper left portion of the axis of the propeller, and the offset type circumferential guide blades are arranged in the mode that the whole offset type circumferential guide blades deflect towards the upper left portion. Or when the propeller is a left-handed propeller, the offset circle center is located on the upper right portion of the axis of the propeller, and the offset type circumferential guide blades are arranged in the mode that the whole offset type circumferential guide blades deflect to the upper right portion; the left upper direction and the right upper direction are defined by the view angle of the ship advancing direction. The device acts on water flow and adjusts the direction of the water flow to reduce eddy current and energy loss, so that the propeller can operate under more ideal conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical fields of energy-saving device for ship, concretely relates to a bias type pre-propeller energy-saving device. BACKGROUND

[0002] The pre-propeller energy-saving device for ship is a device installed in front of the propeller, and its purpose is to improve the propulsion efficiency of the ship and save fuel consumption by optimizing the water flow state. The device is mainly applied to large ships, such as container ships, oil tankers and bulk carriers, and with the increasing requirements for environmental protection and economy, its use is becoming more and more common. When designing such a pre-propeller energy-saving device, the characteristics of the ship, such as the hull lines, the propeller type and the speed, need to be considered, and its installation is usually carried out during the construction of the ship or when the ship is modified. As an important energy-saving device, the pre-propeller energy-saving device for ship has become an indispensable part of modern ship design and operation.

[0003] Therefore, how to provide an energy-saving device that can better assist the operation of the propeller has become a technical problem that technicians in the field urgently need to solve. SUMMARY

[0004] To achieve the above-mentioned purpose, the utility model provides a bias type pre-propeller energy-saving device. The specific technical scheme is as follows:

[0005] A bias type pre-propeller energy-saving device, when in use, the device is fixedly installed on the ship body and located adjacent to the front of the propeller, the front is the direction of the ship's advance, the bias type pre-propeller energy-saving device comprises a bias type circumferential guide vane and a plurality of radial guide vanes, the bias type circumferential guide vane has a bias center, the bias center deviates from the axis of the propeller, each of the plurality of radial guide vanes has a radial outer end and a radial inner end opposite to the radial outer end, when in use, the plurality of radial guide vanes are arranged in a circumferential interval, the radial outer ends are all fixedly connected to the inner circumferential side of the bias type circumferential guide vane, the radial inner ends are all fixedly connected to the ship body, the bias type circumferential guide vane is located above the horizontal plane where the axis of the propeller is located and does not exceed the boundary swept by the outer edge of the rotating propeller;

[0006] When the propeller is a right-handed propeller, the bias center is located above the left of the axis of the propeller, and the bias type circumferential guide vane is arranged in a way that the whole deviates to the left upper side; or when the propeller is a left-handed propeller, the bias center is located above the right of the axis of the propeller, and the bias type circumferential guide vane is arranged in a way that the whole deviates to the right upper side;

[0007] The left upper side and the right upper side are defined in the perspective of the direction of the ship's advance.

[0008] As preferred, the biasing circumferential guide vane comprises a first circumferential segment and a second circumferential segment, which are connected in sequence along the circumferential direction in use, the biasing center comprises a first center corresponding to the first circumferential segment and a second center corresponding to the second circumferential segment, the first center and the second center are located in the same vertical direction, the radius of the first circumferential segment is 0.7-0.9 times the radius of the propeller, the radius of the second circumferential segment is 0.5-0.7 times the radius of the propeller, and the sum of the lengths of the first circumferential segment and the second circumferential segment in the circumferential direction is 1 / 4-1 / 2 of the circumference of the circle swept by the outer edge of the rotating propeller.

[0009] When the propeller is a right-handed propeller, the first circumferential segment is located to the left of the second circumferential segment and the length of the first circumferential segment in the circumferential direction is greater than the length of the second circumferential segment in the circumferential direction; or when the propeller is a left-handed propeller, the first circumferential segment is located to the right of the second circumferential segment and the length of the first circumferential segment in the circumferential direction is greater than the length of the second circumferential segment in the circumferential direction.

[0010] As preferred, the number of radial guide vanes corresponding to the first circumferential segment is m, and the number of radial guide vanes corresponding to the second circumferential segment is n, and m>n.

[0011] As preferred, the m radial guide vanes are uniformly spaced along the circumferential direction of the first circumferential segment, and the n radial guide vanes are uniformly spaced along the circumferential direction of the second circumferential segment.

[0012] As preferred, the radial guide vanes have a common center, which is located on the axis of the propeller.

[0013] As preferred, the ship stern for fixedly mounting the biasing propeller front energy-saving device is used, the axis of the ship stern coincides with the axis of the propeller, and the radial inner ends of the radial guide vanes are fixedly connected to the ship stern in use.

[0014] As preferred, the first circumferential segment and the second circumferential segment of the biasing circumferential guide vane have the same NACA airfoil profile.

[0015] The biasing propeller front energy-saving device has the following technical effects:

[0016] The biasing propeller front energy-saving device is arranged in a specific mounting position regardless of the use of a right-handed propeller or a left-handed propeller, which can better act on the water flow, adjust the direction to reduce vortex and energy loss, and make the propeller operate in more ideal conditions.

[0017] The bias type circumferential guide vane has a two-section structure with different radii (the bias type circumferential guide vane comprises a first circumferential section and a second circumferential section, the first circumferential section and the second circumferential section are arranged in sequence and connected in the circumferential direction in use, the bias center comprises a first center and a second center corresponding to the first circumferential section and the second circumferential section, the first center and the second center are located in the same vertical direction, the radius of the first circumferential section is 0.7-0.9 times the radius of the propeller, the radius of the second circumferential section is 0.5-0.7 times the radius of the propeller, the total length of the first circumferential section and the second circumferential section in the circumferential direction is 1 / 4-1 / 2 of the circumference of the circle swept by the outer edge of the rotating propeller; when the propeller is a right-handed propeller, the first circumferential section is located on the left side of the second circumferential section and the length of the first circumferential section in the circumferential direction is greater than the length of the second circumferential section in the circumferential direction; or when the propeller is a left-handed propeller, the first circumferential section is located on the right side of the second circumferential section and the length of the first circumferential section in the circumferential direction is greater than the length of the second circumferential section in the circumferential direction); the energy saving effect (mainly represented by the reduction of propeller power) of the conventional propeller front energy saving device is about 3%-5%, the energy saving effect of the utility model patent can be improved by more than 20% compared with the conventional propeller front energy saving device, and the utility model patent has popularization and application value. It can be understood that the radii of the first section and the second section are different, that is, the case of the same radius of 0.7 times the radius of the propeller is not included. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A specific embodiment structure diagram of the bias type propeller front energy saving device provided by the utility model;

[0019] Figure 2 For Figure 1 The relative position structure diagram of the bias type propeller front energy saving device and the propeller installed on the ship;

[0020] Figure 3 The structure diagram of the first circumferential section and the second circumferential section included in the bias type circumferential guide vane;

[0021] Figure 4 The relative arrangement structure diagram of the bias type circumferential guide vane and the right-handed propeller.

[0022] Figures 1-4 The reference signs in the drawings are as follows:

[0023] 1 ship body, 2 propeller, 3 bias type circumferential guide vane, 4 radial guide vane, 5 axis, 6 right-handed propeller, 7 first circumferential section, 8 second circumferential section, 9 first center, 10 second center, 11 ship stern, 12 rudder. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will make further detailed description of the utility model of a kind of bias type paddle front energy-saving device combining with the drawings and specific embodiments.The advantages and features of the utility model will be more clearly according to the following description.It should be noted that the drawings are very simplified and all use non-precise scale, only for the purpose of convenient and clear auxiliary description of the embodiment of the utility model.In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the drawings.It is known that the structure, proportion, size and the like shown in the drawings attached to the present specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and are not used to limit the conditions for implementing the utility model, so they do not have the substantial meaning of technology, any modification of structure, change of proportion relationship or adjustment of size, as long as it does not affect the effect and purpose that the utility model can produce, should still fall within the scope covered by the technical content disclosed by the utility model.

[0025] The utility model provides a kind of bias type paddle front energy-saving device, combining Figure 2 As shown, the device is fixedly installed on the ship body 1 and located adjacent to the front of the propeller 2 during use, and the front is the direction of ship advancement.The bias type paddle front energy-saving device includes a bias type circumferential guide vane 3 and a plurality of radial guide vanes 4.The bias type circumferential guide vane 3 has a bias center, which deviates from the axis 5 of the propeller 2.Each of the plurality of radial guide vanes 4 has a radial outer end and a radial inner end opposite to the radial outer end.During use, the plurality of radial guide vanes 4 are arranged at intervals in the circumferential direction, and the radial outer ends are fixedly connected to the inner circumferential side of the bias type circumferential guide vane 3, and the radial inner ends are fixedly connected to the ship body 1.The bias type circumferential guide vane 3 is located above the horizontal plane of the axis of the propeller 2 and does not exceed the boundary swept by the outer edge of the rotating propeller 2. Figure 2 As shown, the rudder 12, the propeller 2 and the position relationship of the bias type paddle front energy-saving device are shown.

[0026] When the propeller 2 is a right-handed propeller 6, the bias center is located above and to the left of the axis 5 of the propeller 2, and the bias type circumferential guide vane 3 is arranged in a manner that the whole deviates to the upper left;or when the propeller 2 is a left-handed propeller, the bias center is located above and to the right of the axis 5 of the propeller 2, and the bias type circumferential guide vane 3 is arranged in a manner that the whole deviates to the upper right.

[0027] The upper left and upper right directions are defined from the perspective of the ship advancement direction.

[0028] As shown, Figures 1-4As shown in the drawings, in one embodiment, the circumferential guide vane 3 comprises a first circumferential section 7 and a second circumferential section 8, which are connected in sequence along the circumferential direction in use, the offset center comprises a first center 9 corresponding to the first circumferential section 7 and a second center 10 corresponding to the second circumferential section 8, the first center 9 and the second center 10 are located in the same vertical direction, the radius of the first circumferential section 7 is 0.7-0.9 times the radius of the propeller 2, the radius of the second circumferential section 8 is 0.5-0.7 times the radius of the propeller 2, and the sum of the lengths of the first circumferential section 7 and the second circumferential section 8 in the circumferential direction is 1 / 4-1 / 2 of the circumference of the circle swept by the outer edge of the rotating propeller 2.

[0029] When the propeller 2 is a right-handed propeller 6, the first circumferential section 7 is located to the left of the second circumferential section 8, and the length of the first circumferential section 7 in the circumferential direction is greater than the length of the second circumferential section 8 in the circumferential direction; or when the propeller 2 is a left-handed propeller, the first circumferential section 7 is located to the right of the second circumferential section 8, and the length of the first circumferential section 7 in the circumferential direction is greater than the length of the second circumferential section 8 in the circumferential direction.

[0030] As shown in the drawings, Figure 3 and Figure 4 are structural schematic diagrams of the circumferential guide vane 3 and its arrangement with the right-handed propeller 6 in the case where the propeller is a right-handed propeller 6. Similarly, for a left-handed propeller, the position relationship and arrangement are as described in the text (not shown in the drawings).

[0031] Among them, the number of radial guide vanes 4 corresponding to the first circumferential section 7 is m, and the number of radial guide vanes 4 corresponding to the second circumferential section 8 is n, and m≥n.

[0032] In one embodiment, for a right-handed propeller 6, the first circumferential section 7 connects 2-3 radial guide vanes 4, and the second circumferential section 8 connects 1-2 radial guide vanes 4; for a left-handed propeller, the first circumferential section 7 connects 2-3 radial guide vanes 4, and the second circumferential section 8 connects 1-2 radial guide vanes 4.

[0033] In one embodiment, the m radial guide vanes 4 are uniformly spaced along the circumferential direction of the first circumferential section 7, and the n radial guide vanes 4 are uniformly spaced along the circumferential direction of the second circumferential section 8.

[0034] Among them, the radial guide vanes 4 have a common center, and the common center is located on the axis 5 of the propeller 2.

[0035] In one embodiment, as shown in the drawings, Figure 1As shown, the ship stern 11 is used to fix the bias type pre-propeller energy-saving device, the axis of the ship stern 11 coincides with the axis 5 of the propeller 2, and the radial inner ends of the plurality of radial guide vanes 4 are fixedly connected to the ship stern 11 in use.

[0036] In a specific embodiment, the first and second circumferential segments 7 and 8 of the bias type circumferential guide vane 3 have the same NACA airfoil profile.

[0037] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A biased pre-propulsor energy saving device, characterized in that, The device is fixedly installed on the ship body and located in front of the propeller in the direction of the ship's forward movement. The device comprises a biasing circumferential guide vane and a plurality of radial guide vanes. The biasing circumferential guide vane has a biasing center which is offset from the axis of the propeller. Each radial guide vane has a radial outer end and a radial inner end opposite to the radial outer end. In use, the radial guide vanes are arranged in a circumferential direction and the radial outer ends are fixedly connected to the inner circumferential side of the biasing circumferential guide vane, and the radial inner ends are fixedly connected to the ship body. The biasing circumferential guide vane is located above the horizontal plane of the axis of the propeller and does not exceed the boundary swept by the outer edge of the rotating propeller. When the propeller is a right-handed propeller, the biasing center is located above and left of the axis of the propeller, and the biasing circumferential guide vane is arranged as a whole to be biased to the upper left; or when the propeller is a left-handed propeller, the biasing center is located above and right of the axis of the propeller, and the biasing circumferential guide vane is arranged as a whole to be biased to the upper right. The upper left and upper right positions are defined from the perspective of the direction of the ship's forward movement.

2. The biased pre-swirl energy saving device of claim 1, wherein, The biasing circumferential guide vane comprises a first circumferential segment and a second circumferential segment which are connected in sequence in the circumferential direction in use. The biasing center comprises a first center corresponding to the first circumferential segment and a second center corresponding to the second circumferential segment. The first center and the second center are located in the same vertical direction. The radius of the first circumferential segment is 0.7-0.9 times the radius of the propeller. The radius of the second circumferential segment is 0.5-0.7 times the radius of the propeller. The total length of the first circumferential segment and the second circumferential segment in the circumferential direction is 1 / 4-1 / 2 of the circumference of the circle swept by the outer edge of the rotating propeller. When the propeller is a right-handed propeller, the first circumferential segment is located to the left of the second circumferential segment and the length of the first circumferential segment in the circumferential direction is greater than the length of the second circumferential segment in the circumferential direction; or when the propeller is a left-handed propeller, the first circumferential segment is located to the right of the second circumferential segment and the length of the first circumferential segment in the circumferential direction is greater than the length of the second circumferential segment in the circumferential direction.

3. The biased pre-swirl energy saving device of claim 2, wherein, The number of radial guide vanes corresponding to the first circumferential segment is m, and the number of radial guide vanes corresponding to the second circumferential segment is n, and m≥n.

4. The biased pre-swirl energy saving device of claim 3, wherein, The m radial guide vanes are uniformly spaced in the circumferential direction of the first circumferential segment, and the n radial guide vanes are uniformly spaced in the circumferential direction of the second circumferential segment.

5. The biased pre-swirl energy saving device of claim 4, wherein, The plurality of radial guide vanes has a common center which is located on the axis of the propeller.

6. The biased pre-swirl energy saving device of claim 5, wherein, The ship stern is used to fixedly install the device, and the axis of the ship stern coincides with the axis of the propeller. In use, the radial inner ends of the radial guide vanes are fixedly connected to the ship stern.

7. The biased pre-swirl energy saving device of claim 6, wherein, The first circumferential segment and the second circumferential segment of the biasing circumferential guide vane have the same NACA airfoil profile.

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