Marine Propeller

Marine Propeller

Fixed PitchMarine Propeller

Propeller is usually composed of blade and hub.Ordinary propeller often 3 or 4 blades, 2 blades propeller is used only for boats. Large ships to avoid vibration normally use 5 or more blades propeller.

Ordinary transport ship has 1 ~ 2 propeller. Large propulsion power ships, can increase the number of propeller. Large fast passenger has 2-4 propellers. The propeller is generally 3 ~ 4 blades ,diameter according to HP and draft, the following end does not touch bottom; the upper end is not over load waterline shall prevail. Propeller speed should not be too high, the marine cargo ship about 100 rpm, small boat speed up to 400 ~ 500 rpm, but the efficiency will be affected.

Propeller is propulsion device with disk shaped helical surface for driving ship, consist of blade and hub. Propeller blades number normally 3 to 6. Including single propeller, ducted propeller, rotating propeller, tandem propeller, controllable pitch propeller, super cavitating propeller, large inclined propeller etc

Marine propeller generally speaking, in the same diameter and pitch ratio, the more number of propeller blades, the thrust better, the higher efficiency of propulsion.

Marine propeller material

Most use copper alloy, the reason mainly: (1) copper alloy corrosion resistance good, basically can meet the requirements of propeller in seawater; (2) copper alloy of low melting point, for melting and casting not need heat treatment but only need processing. Propeller materials are generally manganese bronze or corrosion resistant alloy, stainless steel, nickel aluminum bronze or cast iron.

Nickel aluminum bronze has excellent resistance to stress corrosion cracking, resistance to fatigue corrosion, cavitation erosion resistance, resistance to erosion and sea bio fouling Resistance. And with excellent thermal conductivity, electrical conductivity, good wear resistance, welding performance, and low price.

Marine propeller main technical paramaters

Propeller diameter: single propeller D= (0.7~0.8)Tw; Double propellers D= (0.6~0.7)Tw, Tw is the ship full loaded draft

Disk ratio: in the design propeller, are selected the smallest disk without bubble.

Blade outline shape: design close to ellipse

Propeller blade number: more is advance in reducing vibration, few is advance avoid cavitation favorable

Propeller speed: the speed related to host selection

Controllable Pitch propeller

According to the need adjust the pitch, fully use the host power, improve the efficiency of propulsion, when ship backward not need to change the direction of rotation. The pitch is by hub mechanical or hydraulic steering the rotating mechanism of each blade adjustment. CPP for propeller blade load change has good adaptability, widely used in fishing boats and tugs.

Controllable pitch propeller device, consist of hollow hub with radial uniform blades, blade connecting end is through the hub peripheral wall bearing hole and extends into hollow hub short shaft.The hollow propeller hub cavity set transmission structure which can simultaneously drive the short shaft of each blade rotating and adjust the working angle of propeller blade.

Controllable pitch propeller can not only regulate the working angle of propeller blades according to different working conditions, and improve the utilization output power ratio and service life of engine.

Marine Ventilation equipment summary

Marine Ventilation Equipment

Marine auxiliary equipment

Cabin unit

Model description:

"C": Ships

"UK": top type

"UQ": ball type

"E": electric heating

Composition: mainly consists of the shell, connecting pipe, regulating mechanism, diffuser, electric heating and so on.

Product function:

Air distributor is mainly used to send the air from air conditioner into the cabin to make it mixed with the indoor air evenly.

Product advantage:

The utility model has the advantages of small volume, low noise, convenient and simple operation, compact structure, space saving, stable performance, low energy consumption, shock resistance and swing, convenient maintenance etc. Appearance size can be customized according to customer requirements.

Air volume: 0~350m3/h

Electric heating power (electric heating air distributor): 400W-2000W

Widely used in various types of passenger ships, cargo ships, ships and offshore oil platforms and other places.

Marine Gooseneck Ventilator

Product function:

The ventilation tube is mainly installed on the weather deck ,upper end of the ventilation pipe and fan. To avoid rain falls to the cabin when the fan is sent to the cabin.

Product advantage:

The ventilation tube has the characteristics of reasonable structure, small resistance, convenient construction, complete specifications, wide applicability and good weather and rain density.

Widely used in various types of passenger ships, cargo ships, ships and offshore oil platform and open deck.

Mushroom Ventilator

Product function:

The ventilation tube is mainly installed on the upper end of the ventilation pipe and the fan which is used on the open deck of the ship.

Product advantage:

Reasonable structure, convenient opening and closing, beautiful appearance, complete specifications, good ventilation effect, and reliable, and can meet the needs of the marine industry;

Marine Fire Damper

Fire air valve is mainly used for fire safety requirements of the ventilation system of wind pipe, when fire, once the wind tube temperature rose to more than 70 DEG C, fire air valve quickly and automatically shut down, to achieve regional isolation to prevent fire along the duct and spread, control using Belimo actuators; the fire damper design is according to sea can effectively blocking water vapor, smoke seeps, ensure the work under this kind of environment, especially suitable for humid environment of ship, offshore platform and underground engineering.

Fusing temperature 70 + 3

Closing time < 2S

- the air leakage is less than or equal to 5m3/m2 - H

Control the power supply DC24V/AC110V/AC220V, 50/60Hz

Electrical protection class IP44/IP56

Explosion proof grade ExdIIBT4/ExdIICT4

Fire rating A0~A60

Fire damper is mainly used for ventilation, air conditioning system wind pipe, usually in the "normally open" state, when the air temperature reached 70 degrees Celsius, through the wind valve fuse action automatically closed. Widely used in various types of passenger ships, cargo ships, ships and offshore oil platform and the air duct.

Marine Spiral Duct

Model description:

"R" non adiabatic spiral air duct

"PR" pre heat insulation type spiral air duct

Product function:

Mainly used for Unicom between two air circulation spiral duct to ventilation effect.

Product advantage:

Spiral wind pipe with small ventilation resistance, ventilation and low noise characteristics, good strength and rigidity, suitable for all kinds of acid, alkali, such as the strong corrosive environment. According to the customer request, the specialized design, custom-made all kinds of air pipe;

- diameter: 80-1500mm;

Spiral wind pipe application in purification system air supply and return pipe, central air conditioning pipe, industrial send exhaust ventilation pipe, environmental protection system ceiling exhaust pipe etc., are widely used in various types of passenger ships, cargo ships, ships and offshore oil platform ventilation place tube

Marine Louver Vent

Diffuser is air conditioning or ventilation air outlet, that is, to let out the direction of wind direction into a multi direction flow, generally used in large areas such as the lobby of the air supply outlet set, so that fresh air distribution. Diffuser is used in the air conditioning system of air supply, with a uniform flow characteristics and simple and beautiful appearance, can be made in accordance with the requirements of the use of square or rectangular.

According to the diffuser types, (1) square (rectangular) shape diffuser, multi-layer circular cone powder flow device, a convex circular diffuser, the flow pattern in the flat send attached type; (2) self-operated temperature control variable flow diffuser (3) back to the suction dual-purpose diffuser

The double layer shutter air outlet is generally used as an air supply outlet, and can be directly matched with the fan coil pipe, and can be widely used for the terminal of the centralized air conditioning system, and also can be used for regulating the air flow rate.

Single louver can be adjusted under the direction of the wind, the air inlet can be combined with an air inlet filter screen, proglottid angle can be adjusted, the leaves have ABS plastic bracket. Fixed type filter can remove the filter from the slide in the cleaning, after cleaning and then continue to slide from the push after use.

Fixed air outlet used for heating and cooling air conditioning system, can be installed on the side wall or ceiling.

Marine Hydraulic Steering Gear Introduce

Marine Hydraulic Steering Gear 

Ram type electro-hydraulic steering gear

Consists of one set of ram type driving mechanism, two sets of motor kinetic tank for oil pump, one oil box, which has simple structure to install and is wildely used in navigation zone of inland rapid flowing river, normal navigation zone, and for sea ship. When use for navigation zone of inland rapid flowing river, the steering gear, specification below 16kn·m, is added an extra pressure accumulator or a set of manual emergency pump for emergency steering control; specification above 16kn·m,add an extra set of DC motor pump unit for emergency, to comply with CCS rules.

Control mode of this steering gear series includes direct control of hand-operated direction valve, direct control of steering mechanism, electronic control, pump control and etc. Electronic and pump control can be used together with any form of autopilot and follow-up pilot.

320-1000kN·m ram type electro-hydraulic steering gear (four cylinders with twin piston and one tiller type)The reciprocating and ram type electro-hydraulic steering gear series consists of two sets of reciprocating and ram type rudder mechanism, two sets of motor kinetic tank for oil pump, one reserve tank. Control mode, including electronic control, pump control, can be used together with any form of autopilot or follow-up pilot. To meet cunstomer's requirement, two sets of rudder mechanism, can be used together or separately. One of which fails to

 work, can be used separated to ensure normal work of steering control. It is widely used for ships with high safety performance such as large ship, oil tanker, liquefied-gas carrier, chemical tanker and etc.

cylinder type electro-hydraulic steering gear

Consists of one set of rudder mechanism with two piston type of cylinders, two sets of oil pump units, one reserve tank, one electric control station. To finish procedure of steering control, rotate steerting switch of solenold valve in wheel house, though steering mechanism controls hydraulic oil to cylinder

access, thereby rudder blades work. When power is failure, steering mechanism can be used to complete emergency steering control. It is widely used in navigation zone of inland rapid flowing river, normal zone, and for fishing vessel or small size if sightseeing lunch.

The linked cylinder type electro-hydraulic steering gear series consists of one set of rudder mechanism with two piston type of cylinders, two oil pump power units, one reserve tank. One set of emergency pumps, pressure accumulator or DC motor pump unit is added for using in navigation zone of inland rapid flowing river, to comply with CCS rules.

Control modes includes direct control of manual direction valve, electronic control, pump control, among which, electronic and pump control can be used together with any form of autopilot and follow-up pilot.

The linked cylinder type electro-hydraulic steering gear (four cylinder) consists of one rudder mechanism with four piston type of cylinder, two sets of motor kinetic tanker of oil pump, one reserve oil tank. Control modes, including electronic and pump control, can be used together with any form of autopilot and follow up pilot. Four cylinders can be used together or in couples. One of which fails to work, can be separated to ensure normal work of steering control. It is widely used for ships with high safety performance such as large ship, oil tanker, liquefied-gas carrier, chemical tanker and etc.

Rotary vane electro-hydraulic steering gear

Consists of one set of rotary vane type of rudder mechanism, two sets of motor units of oil pump, one reserve oil tank. It has features of firm structure, minimum space occupation, easy installation, which maximum rudder turning angle is ±65° .Its control modes, including electronic, pump control, can be used together with any form of autopilot and follow-up pilot. Rotary vane steering gear does make navigation through narrow straits safer, because of the vessel increased manoeurablity and improved control when docking.

The rotary vane principle also ensure a constant torque through the steering sequence, providing the steering gear with maximum power output, the unique technical solutions ensure very low noise and vibration level

The compact and simple design reduce weight and secures fact, easy installation of steering gear. The actuators are mounted directly on rudder stock, without necessary use of key, facilicating easier assembly and dismantling of rudder stock. The rudder torque is transmitted by hydraulic coupling or by expansion rings.

synchronous steering gear

In order to meet the requirements of special ships on the steering gear, after special research and test, produce a type steering gear can overcome two rudder inner and outer resistance difference, in the whole operating process in synchronized state, a synchronous servo mechanism that the connecting rod does not need; the synchronous state same as us a connecting rod and avoids the defects by connecting rod. The electric hydraulic control synchronous servo, performance than the previous control synchronization is much superior; applicable to catamaran, wide boat.

The synchronous steering gear can accept autopilot control, such as asynchronous steering, can have state of same direction with asynchronous and different direction with asynchronous manipulation. Can instead azimuth thruster function. Can be used in the marine engineering ship tugboat, catamaran, dynamic positioning.

Synchronous steering gear has 24V electric operation, steering handwheel operation and emergency steering handwheel three ways. By a set of hydraulic pump station to provide power to drive the four cylinders two steering gear.

Inflatable Buoy use as yacht fender,mooring buoy,channel buoy ,finshing buoy etc

Inflatable Buoy

Inflatableyacht buoy fender

Inflatable yacht fender supply protective effect and buffer to yacht. It is widely used in yacht, yacht dock, floating platform, etc.

Using high-quality PVC raw material made of airtight container, after full compressed air can be floating on the water surface, as boats and docks important buffer medium. And Inflatable yacht buoy can absorb a large number of ship motion impact energy and reduce the boat recoil, greatly improves the boats docked security.

Raw materials: yacht fender with high quality PVC, in line with the country's environmental protection requirements, environmental protection, non-toxic, seawater anti-corrosion. Raw materials to add anti Ultraviolet rays ingredients, Sunscreen, even for a long time exposure to the sun will not fade.           

Yacht buoy use overall rotate molding, ears and body as a whole. Ears have strength processing, so very strong solid, suitable for hanging, not easy to break.

Inflatablebathhouse life buoy

PVC bathing beach life buoy can be used as a warning float ball, but also can be used as a life buoy. The tourists feel tired of swimming, can lie on the floating ball, restore strength.

PVC Inflatable Aquaculture Buoy                                               

Raw materials: PVC aquaculture buoy with high quality PVC, in line with the country's environmental protection requirements, environmental protection, non-toxic, seawater anti-corrosion. Raw materials to add anti Ultraviolet rays ingredients, Sunscreen, even for a long time exposure to the sun will not fade.          

PVC aquaculture buoy, the general service life about 3-5 years. Products can be inflated, high elastic, encountered waves, storms and will not easily break. The mounting structure is simple, each floating buoy has ears, and can be directly fixed.

Inflatable Mooring Buoy

Anchor buoy also known as mooring buoy, can be used as a signal of foreign trade vessels, privateers, military mooring and emergency anchor release.

Anchor buoy ear part is strong, not easy to break. Floating performance is good, the color is bright.

Mooring buoy has good sealing performance, no leakage, anti-ultraviolet, and corrosion resistance.

                                                                          

Inflatable Channel Buoy

Inflatable Channel Buoy is in the vast sea as reference, for navigation or mark channel and shoals rapids, for fishing nets in the water, detection equipment marking. They are usually anchored to prevent flow in water.

The color of channel buoy must be bright, in the sea can be very clear to be seen. And in the roaring waves of sea, channel buoy required for anti-collision performance very high.

Simple installation mode, bright color, strong anti-collision performance, and seawater corrosion resistance property, deserves to be the best choices as fairway buoy. "

Polyurethane buoy fender

It is polyurea material make outer protection layer, the internal use closed cell foam rubber materials as buffer medium, with large buoyancy, seawater corrosion resistance advantages, and can be made into various shapes.

Polyurethane buoy fender with good floating performance and is not affected by tidal range; bright color, can according to user requirements to provide variety colors; compared with inflatable buoy has better safety and free maintenance; flange or cable connection and installation, convenient to move and use.

Polyurethane Floating fender use spray painting, more colorful also more durable. Products according to customer requirements can with chain, shackle etc.