CN218112950U

CN218112950U - Pyramid-like energy-saving hub cap

Info

Publication number: CN218112950U
Application number: CN202222778886.5U
Authority: CN
Inventors: 刘洋浩; 黄少锋; 孙海素; 杨博; 陈康
Original assignee: Shanghai Sidarui Ship Sea Engineering Service Co ltd
Current assignee: Shanghai Sidarui Ship Sea Engineering Service Co ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2022-12-23
Anticipated expiration: 2032-10-21

Abstract

The utility model discloses a prismoid-like energy-saving hub cap which is arranged behind a propeller on a ship; the sealing device comprises side walls which are distributed annularly and a rear wall for sealing an opening at the rear end of each side wall; the side wall and the rear wall enclose an accommodating cavity; the front end of the side wall is a circular end part, the rear wall is a polygon with rounded corners, and the intersection of two adjacent sides of the polygon is a rounded corner structure; the number of the sides of the polygon is the same as the number of the blades of the propeller; the side walls and the rear wall are integrally formed. The utility model can obtain 0.5-1% of energy-saving benefit; the structure is simple, and the design and the manufacture are convenient.

Description

Pyramid-like energy-saving hub cap

Technical Field

The utility model relates to a boats and ships technical field, in particular to energy-conserving hub cap of kind of terrace with edge type.

Background

In all the civil operation ships, the propeller is the most widely applied propulsion form. On the premise of taking the propeller as a propeller, the energy-saving principle of the ship energy-saving device is divided into three categories from the hydrodynamic characteristics. Firstly, the forward flow of the propeller is changed, so that the efficiency of the whole propulsion system is improved, such as a propeller front guide vane, a propeller front guide pipe and the like; secondly, the design form of the propeller is changed, such as the trim optimization, the new blade section design form and the like; thirdly, the rotary energy loss in the propeller wake vortex is recovered. The design applies the third energy-saving principle. The existing energy-saving device for recovering the energy loss of the wake vortex mainly comprises a twisted rudder, a hub cap fin, a rudder with a thrust fin and the like. However, the structures of the numerous wake vortex recovery energy-saving devices are complex, the process requirement is high, the maintenance is difficult, the design difficulty is high, and meanwhile, the existing energy-saving devices are added with new structures on the basis of the original structures, so that the corresponding cost is also increased.

In the prior art, a device for recovering the rotation energy of the propeller wake vortex is mainly divided into two attached forms.

The first kind of attached body is hub cap fin, and the energy-saving attached body is fixed at the tail end of a propeller shaft, rotates along with the propeller, and disturbs water flow through blades on the energy-saving attached body to achieve the purpose of saving energy. The energy-saving target is mainly realized by the upper blade, various radial distributions, such as camber, blade width, pitch, trim, side inclination and the like, need to be considered in the design process of the blade, and the blade can generate considerable energy-saving effect only by reasonable distribution, and if the distribution is not reasonable enough, even negative effect can be generated, the design difficulty is high. Simultaneously, according to the intensity requirement, the thickness radial distribution of blade also needs to carry out reasonable design, need carry out complicated finite element intensity analysis even in order to ensure its safety when ship uses, and this has also increaseed the design degree of difficulty and design cycle undoubtedly. In addition, according to the test measurement result, the energy-saving effect of the energy-saving appendage is usually about 1%, the performance is not improved very much through the complicated design process, and the energy-saving appendage has low cost performance.

The second is an appendage structure attached to the rudder, such as a rudder ball, twisted rudder, etc. The structure is a fixed structure and does not need to rotate, so that power driving is not needed, the main principle of energy saving is that the additional thrust borne by the appendage when the appendage rotates in the wake of the propeller is larger than the resistance caused by the appendage, or the resistance received by the rudder is reduced due to the appendage, but the appendage is added or the shape is changed to adapt to the rotating wake of the propeller. However such are rigidly fixed to the rudder blade,

the energy-saving device mainly adopts direct sailing during test measurement, can capture the energy-saving effect, and has the advantages that in the real ship sailing process, the rudder needs to be steered at a certain rudder angle to run for balancing the deflection effect of the propeller and the sailing requirements such as steering, and under the working conditions, the energy-saving device fails, and the additional body resistance is increased on the basis of failure in a less additional installation state. Therefore, the energy-saving effect of the energy-saving device is discounted on the basis of test measurement by comprehensively considering the energy-saving device. In addition, because the structure of the rudder is the characteristic of the external skin of the internal skeleton and the rigid connection form of the rudder, the structural design form which is compatible with the strength also becomes one of the limiting factors. The energy saving effect of such an energy saving device is about 1%.

In addition, due to the design characteristics of the two types of complicated wake vortex recovery energy-saving devices, the design period is long, and a large amount of calculation verification is needed, so that a relatively ideal scheme is obtained. This is also one of the drawbacks of the prior art.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome the above-mentioned defect that prior art exists, provide an energy-conserving hub cap of kind terrace with edge type.

The utility model discloses an above-mentioned technical problem is solved through following technical scheme:

a prismoid-like energy-saving hub cap is arranged behind a propeller on a ship; the sealing device comprises side walls which are distributed annularly and a rear wall for sealing an opening at the rear end of each side wall; the side wall and the rear wall enclose an accommodating cavity; the front end of the side wall is a circular end part, the rear wall is a polygon with rounded corners, and the intersection of two adjacent sides of the polygon is a rounded corner structure; the number of the sides of the polygon is the same as the number of the blades of the propeller; the side wall and the rear wall are integrally formed.

The rear wall is a regular polygon with rounded corners.

The area of the rear wall is smaller than the area of the rounded end of the front end of the side wall.

The outer surface of the side wall is a transition surface extending from the rounded end of the front end of the side wall to the polygonal configuration of the rear wall.

The outer surface of the side wall is a convex transition surface.

The outer surface of the side wall is a concave transition surface.

The outer surface of the side wall is a straight transition surface.

The front end of the side wall is provided with a bolt groove; the bolt grooves are circumferentially distributed along the outer surface of the side wall.

And bolt holes are formed in the wall of the bolt groove.

When the frustum-shaped energy-saving hub cap is fixedly connected to the rear of the propeller, each vertex of the polygon of the rear wall has a phase corresponding relation with the position of the propeller blade.

The beneficial effects of the utility model reside in that: the prismoid-like energy-saving hub cap realizes energy conservation by weakening the rotary energy loss of the hub vortex, and can obtain 0.5-1% of energy-saving income; the structure is simple, and the design and the manufacture are convenient. The utility model discloses an energy-conserving hub cap of class terrace with edge type can obtain with other economizer higher energy-conserving effect of the same type, solved simultaneously design difficulty, structure complicacy, can't work in energy-conserving state lastingly and four drawbacks such as design cycle is longer, is more reasonable novel economizer.

Drawings

Fig. 1 is a perspective view of the preferred embodiment of the present invention.

Fig. 2 is a front view of the preferred embodiment of the present invention.

Fig. 3 is a rear view of the preferred embodiment of the present invention.

Detailed Description

The present invention will be more clearly and completely described below with reference to the accompanying drawings.

As shown in fig. 1, 2 and 3, a frustum pyramid-shaped energy-saving hub cap is arranged behind a propeller on a ship; the device comprises a side wall 10 and a rear wall 20, wherein the side wall 10 is distributed annularly, and the rear wall is used for sealing a rear end opening of the side wall; the side wall 10 and the rear wall 20 enclose a receiving cavity. The accommodating cavity enclosed by the side wall and the rear wall is a cavity for accommodating the hydraulic nut.

The front end of the side wall 10 is a circular end, and the rear wall 20 is a polygon with rounded corners, and the intersection of two adjacent sides of the polygon is a rounded corner structure. The number of the sides of the polygon is the same as the number of the blades of the propeller.

The side walls 10 and the rear wall 20 are integrally formed.

In the present embodiment, the rear wall 20 is a regular quadrangle having rounded corners.

The area of the rear wall 20 is smaller than the area of the rounded end of the front end of the side wall 10.

The outer surface of the side wall 10 is a transition surface extending from the rounded end of the front end of the side wall to the polygonal configuration of the rear wall.

The transition surface may take a variety of forms. In this embodiment, the outer surface of the sidewall is a concave transition surface. In another embodiment, the outer surface of the sidewall is a straight transition surface. In other embodiments, the outer surface of the sidewall is a convex transition surface.

The front end of the side wall 10 is provided with a bolt groove 11; the bolt grooves are circumferentially distributed along the outer surface of the side wall. The wall of the bolt slot 11 is provided with a bolt hole 12.

The prismatic table energy-saving hub cap is formed by casting and is an integrally formed structure.

The utility model discloses an energy-conserving hub cap of class arris platform type through the bolt fastening in screw rear, with screw rigid connection and synchronous rotation, this hub cap can effectively protect the hydraulic nut that is located the holding intracavity, protects whole shafting end. Meanwhile, the hub cap has the appearance that the common circular truncated cone shape is abandoned, and the shape similar to a prismoid is used, so that the aim of saving energy is fulfilled.

When the propeller runs, the water flow form at the position near the propeller hub also presents a polygon-like distribution with the same number of blades, when the flow characteristic reaches the frustum-like energy-saving hub cap, when the ridge or the groove of the side wall of the frustum-like energy-saving hub cap, which forms a certain inclination angle with the axial direction, the side wall acts on the water flow with force, the force reduces the rotary motion in the hub vortex, correspondingly, the water flow also acts on the side wall, so that the hub cap recovers a part of torque to drive the propeller to rotate, and the recovery of the part of torque realizes the aim of energy saving.

The utility model discloses an energy-conserving hub cap of class arris platform type realizes energy-conservingly through the mode that weakens hub vortex rotation energy loss. Through numerical analysis, the prismatic table-like energy-saving hub cap can obtain 0.5-1% of energy-saving benefit.

The utility model discloses an energy-conserving hub cap of class terrace with edge type has simple structure's characteristics, and it does not have the blade that the shape is complicated, consequently need not consider the radial distribution form of six key elements of blade, does not talk about more and checks consequently its design degree of difficulty and obtained reducing substantially. The defect that the structural form and the design flow are complex in the prior art is overcome.

The utility model discloses a class arris platform type energy-conserving hub cap passes through the bolt fastening in screw rear, with screw rigid connection and synchronous rotation. The connection form avoids the connection form of fixing the hiding ball, the twisted rudder and the like on the rudder blade, thereby ensuring that the rudder blade can continuously and stably work right behind the propeller to recover energy.

The utility model discloses an energy-conserving hub cap of class terrace with edge type can obtain with other higher energy-conserving effects of economizer of the same type, solved simultaneously design difficulty, the structure is complicated, can't work in energy-conserving state lastingly and four drawbacks such as design cycle is longer, is more reasonable novel economizer.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments can be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. A prismoid-like energy-saving hub cap is arranged behind a propeller on a ship; the sealing device is characterized by comprising side walls distributed annularly and a rear wall used for sealing an opening at the rear end of each side wall; the side wall and the rear wall enclose an accommodating cavity; the front end of the side wall is a circular end part, the rear wall is a polygon with rounded corners, and the intersection of two adjacent sides of the polygon is a rounded corner structure; the number of the sides of the polygon is the same as the number of the blades of the propeller; the side walls and the rear wall are integrally formed.

2. The energy saving cap of claim 1, wherein the rear wall is a regular polygon with rounded corners.

3. The energy saving spinner of claim 1 in which the area of the rear wall is less than the area of the rounded end at the forward end of the side wall.

4. The energy saving cap of claim 1, wherein the outer surface of the side wall is a transition surface extending from the rounded end of the front end of the side wall to the polygonal configuration of the rear wall.

5. The energy saving cap of claim 4, wherein the outer surface of the sidewall is a convex transition surface.

6. The energy-saving hub cap of claim 4, wherein the outer surface of the side wall is a concave transition surface.

7. The energy saving cap of claim 4, wherein the outer surface of the sidewall is a straight transition surface.

8. The frustum-shaped energy-saving hub cap as claimed in claim 1, wherein the front end of the side wall is provided with a bolt groove; the bolt grooves are circumferentially distributed along the outer surface of the side wall.

9. The energy-saving boss cap of claim 8, wherein the slot wall of the bolt slot has a bolt hole.

10. The energy-saving hub cap of claim 1, wherein when the energy-saving hub cap is fixed behind the propeller, each vertex of the polygon of the rear wall has a phase corresponding relationship with the position of the propeller blades.