CN2081371U

CN2081371U - Energy-saving contra-fin front paddle

Info

Publication number: CN2081371U
Application number: CN 90223236
Authority: CN
Inventors: 钱文豪
Original assignee: INST NO 708 RESEARCH ACADEMY N
Current assignee: INST NO 708 RESEARCH ACADEMY N
Priority date: 1990-11-10
Filing date: 1990-11-10
Publication date: 1991-07-24

Abstract

The utility model belongs to the field of energy-saving devices for ship ends, which is composed of fin blades whose cross section is airfoil-shaped or fractate-airfoil-shaped. The fin blades, which are in a sector installed on the front of the spiral side oar of the propeller, can decrease the energy loss of the propeller rear wash, matched with the propeller, so that the propulsion efficiency of the propeller is improved, and the power of the host machine is saved by 4-8%. The utility model, which has the advantages of a simple structure, and less investment, has only 1-4 fin blades; the investment of a newly produced ship is nearly not increased, and the loading expense cost of an old ship can be retracted within a few months, if the utility model, which can be adopted by any ship propelled by a propeller, is adopted.

Description

Energy-saving contra-fin front paddle

The utility model belongs to boats and ships afterbody energy saver field.

Under the situation that the cry that improves propeller for vessels propulsion coefficient, energy savings grows to even greater heights, emerge immediately to changeing oar.To changeing the loss that oar can reduce rotating energy in its wake flow effectively, thereby more common propeller propulsive efficiency height.But its structure more complicated, initial cost is bigger, applies to be restricted.For this reason, behind its improved type oar fixedly behind guide vane, the oar fixedly before impeller and the oar fixed guide vane (reaction fin before the oar) just arise at the historic moment.This device cooperates the rotating energy that can make propeller race to reduce with screw propeller, reach purpose of energy saving, and energy-saving effect is 4-8%, and structure has tangible simplification to changeing oar, and initial cost also greatly reduces.But its designs simplification is still not really desirable, still needs the 6-8 fin leaf, and initial cost is still higher, and Applicable scope is less, is only applicable to plentiful screw propeller and advances behind the boats and ships, particularly oar removing stage makeup and costume of screw propeller when fixedly impeller influences shiprepair behind the fixedly guide vane and oar, and intensity is difficult for guaranteeing, and is inapplicable.

The purpose of this utility model is to propose a kind of new rectification fin that cooperates with screw propeller, has simple in structurely, and initial cost is economized, advantage applied widely, and energy-saving effect reacts fin before being not less than oar.

Therefore the utility model provides a kind of oar preceding rectification fin (seeing accompanying drawing).It is made up of the fin leaf, and the tangent plane shape of fin leaf is generally airfoil type or knuckle airfoil type, and its exhibition length is 0.8～1.3 times of propeller radius, and chord length is for opening up long 0.1～1.0 times.Before the fin leaf is installed on fanwise and revolves the side oar on the screw propeller, with the fore-and-aft distance of screw propeller be 0.1～2.0 times of diameter of propeller.For single-blade ship dextrorotation oar situation, the fin leaf is loaded on the port side hull, left-handed oar situation, and the fin leaf is loaded on the starboard side hull; For two oar double tail fins type ship outward turning oar situations, the fin leaf is loaded on the inboard hull of double tail fins, inward turning oar situation, and the fin leaf is loaded on the hull of the double tail fins outside; For two oar bracing strut type ship outward turning oar situations, the fin leaf is loaded on the bracing strut of the inboard the place ahead of oar dish, inward turning oar situation, and the fin leaf is loaded on the bracing strut of the place ahead, the oar dish outside; For multiple-screw vessel, the installation site of fin leaf is by above situation appropriate combination, and as the triple screw vessel situation, middle oar is pressed single-blade ship situation and considered that outside oar is pressed the r Zweier situation and considered.Fin number of sheets amount is decided by the layout of propeller load, stern shape and bracing strut, gets 1～4 usually.Fin leaf setting angle is relevant with screw propeller rotation direction, load, stern shape or bracing strut layout, is generally-10 °～15 °.The setting angle of fin leaf shown in Figure 3 be on the occasion of.Before the rectification fin was loaded on common screw propeller, common ring stiffener at the outer end of fin leaf machine for casing-in or applying cover to book aerofoil profile tangent plane or other shape tangent planes was to increase the strength and stiffness of rectification fin.As before being loaded on shrouded propeller, then rectification fin outer end is fixed on the inwall of conduit usually, can save the ring stiffener of fin leaf outer end.

Description of drawings:

Fig. 1 (a) faces sketch for the preceding fan-shaped rectification fin of conventional single-blade quarter of a ship dress oar; Fig. 1 (b) faces sketch for the preceding fan-shaped rectification fin of two oar double tail fins type ship afterbody dress oars; Fig. 1 (c) faces sketch for the preceding fan-shaped rectification fin of two oar bracing strut type ship afterbody dress oars; Fig. 2 (a) and (b), (c) face sketch for the preceding fan-shaped rectification fin reduced form of two oar bracing strut type ship afterbody dress oars; Fig. 2 (d), (e), (f), (g), (h), (i), (j), (k) face sketch for the reduced form of the preceding fan-shaped fin of single-blade quarter of a ship dress oar; Fig. 3 is a rectification fin stagger angle scheme drawing before the oar.More than each figure all for seeing view by the stern-on bow.

1-propeller blade tip scanning line among the figure; 2-bracing strut support arm; 3-rectification fin blade; 4-rectification fin end of blade ring stiffener; 5-shipful waterline; 6-screw propeller tailing axle; The 7-boats and ships; Boats and ships cross-sectional upper thread in rectification fin place before the 8-dress oar; θ-rectification fin stagger angle.

The fan-shaped rectification fin of simplification shown in Figure 2 is to be simplified according to stern shape and attached body layout feature by fan-shaped rectification fin shown in Figure 1.

The utility model is applicable to the various boats and ships that screw advances, and comprises single-blade ship, two oar ship, multiple-screw vessel and double tail fins, many tail fins, the two oar ships of bracing strut type, multiple-screw vessel. New and old boats and ships all can adopt. The utility model is simple in structure, easy for installation, initial cost is very little, once invests in 1 year recoverable. Adopt the utility model almost not increase cost in new shipbuilding, install additional at obsolete vessel, expense is also very low, and can not affect the depressed place and repair the cycle. The utility model energy-saving effect is obvious, and is different with stern shape according to the screw load, can save main engine power 4～8% by more similar ship. Adopt the test of the utility model (two fins) model such as 2640 horsepowers push boat (ducted propellers), 13～14 kilometers/hour of towing speeds, energy-saving effect reach 6%, two month recyclable installation fee. The utility model also can be used in combination with energy-conservation device behind other energy-conservation shipform such as asymmetric tail etc. and the oar such as kuppe, can further improve energy-saving effect.

Claims

1, rectification fin before a kind of oar, fin leaf (3) by the airfoil type tangent plane is formed, before its technical characterictic is to be installed on fanwise and revolves the side screw propeller on the screw propeller, with the distance of screw propeller be 0.1～2.0 times of diameter of propeller, quantity is 1～4, and setting angle is-10 °～15 °.

2, rectification fin according to claim 1, its technical characterictic are that fin leaf (3) is loaded on the hull port side for single-blade ship dextrorotation oar situation, left-handed oar situation, and fin leaf (3) is loaded on the hull starboard side; Two oar double tail fins type ship outward turning oar situations, fin leaf (3) are loaded on the inboard hull of double tail fins, inward turning oar situation, and fin leaf (3) is loaded on the hull of the double tail fins outside; Two oar bracing strut type ship outward turning oar situations, fin leaf (3) are loaded on before the oar dish inboard on the bracing strut, inward turning oar situation, and fin leaf (3) is loaded on the bracing strut of the place ahead, the oar dish outside; The multiple-screw vessel situation is pressed with the upper type appropriate combination.

3, rectification fin according to claim 1 and 2, its technical characterictic are that the exhibition length of airfoil type tangent plane fin leaf is 0.8～1.3 times of propeller radius, and chord length is 0.1～1.0 times of exhibition length.

4, rectification fin leaf outer end was provided with ring stiffener (4) before rectification fin according to claim 1, its technical characterictic were common screw propeller.