CN1046713A - Propeller protector - Google Patents

Abstract

The invention belongs to boats and ships propeller protector class.People adopt the method that common conduit or preposition conduit are set to improve propulsion coefficient before this, but various sink-float foreign material enter the propeller disk place and cause the damage oar in the water that conduit sucks, and the present invention has solved damage oar problem preferably.The present invention is made up of 3～20 of the fair water fins of conduit and screw propeller the place ahead, conduit installed inside, in order to obtain better effect, also can circle be installed outside blade according to circumstances, permeable ring is installed, the annulus of affixed blade etc.Fig. 1 is the propeller protector of dress fair water fin in the common conduit.It also is equipped with permeable ring, the annulus of affixed blade blade tip.

Description

Propeller protector

The invention belongs to boats and ships propeller protector class.

Load to full formed ship oceangoing ship or screw propeller is higher, power coefficitent B _pBigger boats and ships for obtaining propulsion quality preferably, use conduit-comprise common conduit and preposition conduit usually.By framing member and preposition conduit during to oar card place, water flow velocity is even as current as described in the clear 59-73392 of day disclosure special permission communique (A) B63H, and conduit can produce thrust, can prevent that the bilge whirlpool from taking place, thereby improve propulsion coefficient.

But when boats and ships used preposition conduit, the dead-wood that the proportion that sinks under water in the navigation channel is less, volume is bigger, slabstone and floating ice etc. easily were inhaled into conduit and enter propeller disk, thereby damaged blade; When meeting the obstacle that be difficult for to suck, after boats and ships were pressed in and pass through on the obstacle, in case stern sinks because of the supporting of clear or obstacle breaks away from the perk that presses down of hull, the blade that linear velocity is very high will strike on this class obstacle and cause damaging; If obstacle is in the side, riverbed, boats and ships are turned at this, or boats and ships break away from stranded state, or boats and ships retreat, and all have because of the impaired phenomenon of blade bump obstacle to take place.And when using common conduit, because of being blocked, blocked the situation of decreasing oar by ice cube, dead-wood and also occur repeatedly by finger stone between pipe inner wall and blade.At among the people how useful raising safety factor, thicken blade, select for use raising blade intensity such as high strength material to reduce the way of decreasing oar.But said method can reduce the propulsion functions of oar first, when meeting obstacle simultaneously, easily makes tailing axle, propeller shaft sleeve, gear, main frame etc. impaired.So the method for oar problem is decreased in the more satisfactory solution of neither one before this.

Simultaneously, owing to conduit can not the restricted passage propeller disk current flow along the oar hand of rotation and cause degradation of energy.

The present invention protects oar to put.Setting the objective of the invention is for when using at boats and ships or do not use conduit or preposition conduit, under the situation that does not influence propulsion quality, avoids that various sink-float foreign material cause damage to blade in the water.

The present invention includes conduit [6] (common conduit or preposition conduit), the invention is characterized in that it also is included in screw propeller the place ahead, [3] 3～20 of the fair water fins of conduit installed inside.Because stopping of fair water fin prevented to enter the oar card again after big obstacle is inhaled into conduit, improves the intensity of conduit, thereby reaches the purpose of protecting slurry.Simultaneously, because conduit can alleviate main unit load, fair water fin is then opposite, its coefficient result has reduced the amplitude that main unit load changes, active service boats and ships for duct free, no fair water fin install this device additional, then than a feeder apparatus conduit or only install fair water fin additional, more can reach purpose of energy saving, simultaneously, often can save the trouble that changes pitch, oar footpath or the change reduction ratio of oar because of changing load.

When conduit is preposition conduit, in order to protect the oar better effects if, except that conduit installed inside rectification fin, also at the peripheral fixedly circle [11] of installing 60 °～270 ° of screw propeller, leave the gap between circle and propeller blade tip, do not hinder the motion of screw propeller, circle is 0.04～0.4 times of diameter of propeller along the width of captain's direction.This circle can with hull or tail framework direct connection, also can connect by coupling plate, also can be connected as a single entity with preposition conduit, also can distinguish independence.When being connected as a single entity, can be at the perforate of the junction in oar the place ahead, fluting.Like this, no matter hull retreats or turns, and oar and obstacle can be separated by circle.The obstacle that comes from the place ahead makes that because of the synergy of fair water fin and conduit the obstacle yardstick that can enter the oar card is very little, also can be dished out at the circle opening part [12] of blade tip periphery.In addition, this circle still has the inhibition flow method to the function that flows.

As shown in Figure 1, also can be between blade and fair water fin, the conduit inboard, permeable ring [2] is set, it is, a thin-walled pory ring affixed with the conduit inboard, its internal diameter is less than diameter of propeller, its aperture is less than the distance of the blade tip and pipe inner wall, as when being preposition conduit, the aperture is less than the distance of the blade tip and the peripheral circle inwall of blade tip.Like this, can prevent from effectively that the hard things of small scale such as finger stone from entering to block blade between the blade tip and the adjacent wall and then cause the damage oar, and current can pass through more swimmingly.

When 0.5～2.0 times the garden ring [1] that is about blade blade tip width by its width with oar rotation when the screw blade blade tip connected, blade intensity can increase, and the garden ring can limit blade tip and streams simultaneously, thereby also can improve the propulsion quality of oar when protecting oar.

The present invention is through on probation, and screw propeller uses normal up to now.And before this, to damage a double helix oar in average three months usually, to damage several in January sometimes.Simultaneously, use this invention after, ship speed also obviously increases.These and former analysis result and laboratory result coincide.

Description of drawings:

Fig. 1 is one of embodiments of the invention, Fig. 2 is the A-A view of Fig. 1, Fig. 3, Fig. 4 are the A-A views that the fair water fin difference is provided with situation, Fig. 5 is the embodiment that permeable ring is arranged, Fig. 6 is the B-B view of Fig. 5, Fig. 7 has the embodiment that connects blade blade tip garden ring, and Fig. 8 is the embodiment of conduit and preposition conduit, and Fig. 9 is the C-C view of Fig. 8.

Code name among the figure:

1-connects blade blade tip garden ring

The permeable ring of 2-

The 3-fair water fin

The 4-screw propeller

The 5-hull

The 6-conduit comprises common conduit and preposition conduit

7-tail framework

The 8-rudder

9-rudder Fu Jin rotation revolves body shape rectifying device

The attached fin-shaped rectifying device of 10-rudder

The peripheral circle of 11-blade tip

The peripheral circle opening part of 12-blade tip

Claims (4)

1, propeller protector comprises conduit [6], the invention is characterized in that it also is included in [3] 3～20 of the fair water fins of screw propeller the place ahead, conduit installed inside.

2, propeller protector according to claim 1, it is characterized in that conduit is preposition conduit [6], screw propeller [4] blade tip periphery is equipped with 60 °～270 ° circle [11], leave between circle and blade tip and can make screw propeller motion gap freely, the circle width is 0.04～0.4 times of diameter of propeller.

3, propeller protector according to claim 1 and 2 is characterized in that in the conduit inboard, and the pory permeable ring of thin-walled [2] is set between fair water fin and the blade, and permeable ring internal diameter is less than the diameter of screw propeller.The aperture is less than the distance of blade blade tip and conduit inboard and the distance of blade tip and circle.

4, propeller protector according to claim 1 is characterized in that screw propeller [4] blade tip is connected with the affixed garden ring [1] with the blade rotation of blade by one.The width of garden ring is about 0.5～2.0 times of blade blade tip width.

Images