Method of starting diesel engine of life boat and device for realization of this method

FIELD: marine power engineering; diesel engines for life boats.

SUBSTANCE: proposed method includes setting the manual starting unit in motion with shaft transmitting the torque to crankshaft through chain transmission. Shaft is provided with pulley with one end of rope wound on it; other end of rope is secured on fixed rod which is used for connecting both boat davits. Life board is suspended from boat davits. Device for starting the diesel engine has shaft transmitting the torque to crankshaft through chain transmission. Shaft is provided with pulley on which one end of rope is wound; other end of rope is secured on fixed rod connecting boat davits from which life boat is suspended.

EFFECT: enhanced reliability; reduction of time required for starting the diesel engine.

3 cl, 1 dwg

 

The invention relates to marine energy, in particular to energy units of collective rescue of the crews of vessels (lifeboats).

Known methods of diesels lifeboats: electrical and mechanical, the latter in turn is divided into manual, hydraulic, pneumatic and other [1. Alwahab M.M. Engines lifeboats and boats. - Leningrad: Sudostroenie, 1980, p.15]. However, these methods have inherent shortcomings that significantly reduce the reliability of the launch of the diesel lifeboats and, thereby, threatening the successful rescue of human life in the event of Maritime accidents or disasters. So the muscular force of the person is often not enough to ensure the speed of movement of the piston, which will happen guaranteed ignition of the fuel in the cylinder, especially at low temperatures. Battery capacity is able to rapidly decrease with decreasing ambient temperature, which leads to lack of energy required to reliably start the engine.

The closest basically the solution is to start diesel lifeboats manually which includes a cranking arm allopourinola device two or four l is Dimi [2. Alwahab M.M. Engines lifeboats and boats. - Leningrad: Sudostroenie, 1980, p.18]. The disadvantages of this method is, firstly, the low speed of the piston required for reliable ignition of the fuel in the combustion chamber; secondly, the use of flammable liquids (e.g., “Cold-D”) at low ambient temperatures, which requires additional equipment. The start of the engine is not less than 60 seconds.

The technical objective is to develop more reliable and fast way to start diesel lifeboats with the use of gravity of the boat during its descent from the vessel and the device for its implementation.

The technical result - increasing the reliability and reducing the time of starting the diesel engine of the rescue boat. It is achieved by the fact that during the descent the lifeboats from the ship on the water under the action of gravity, the boat is driven starter, torque the crankshaft of the engine up to speed, which ensures reliable ignition of the fuel in the cylinder of a diesel engine and its subsequent steady work.

Example I the complete method.

When the emergency situation of the magnetic actuator was powered electric winch, which with the help of ropes and blocks down the life boat. The boat was placed person overseeing the operation of the diesel engine. Using the force of gravity descending on ropes of the boat, with 3-5 set in motion by the crankshaft of the diesel engine to the desired start speed at the minimum ambient temperature is 10-15° C. by means of the cable rigidly mounted on the rod and associated with the davits, pulley shaft manual start and chain drive powered starting device for transmitting torque to the crankshaft of the diesel engine. When the boat below deck diesel started to work at a sustainable pace. After this has landed people in the boat.

The method was implemented using the starting device shown in the drawing. It contains the body of the boat 1, Davit crane 2, a rod 3, a cable 4, a pulley 5, a shaft for manual start 6, chain drive 7, the crankshaft 8.

The device operates as follows: when lowering the lifeboats 1 cable 4, is rigidly fixed on the rod 3 connecting Davit crane 2, rotates the pulley 5. The pulley 5 mounted on the shaft for manual start 6, transmits the force of the chain transmission 7, which creates a torque on the crankshaft 8, which results in the start of a diesel engine (not labeled).

Below is the calculation of the elements of the starter with the known mass of the lifeboat closed type, is equal to 273 kg, and diesel 4 private agricultural company 8,5/11 equal to 450 kg

Jdw/dt=Ml-Mc;

where J is the moment of inertia;

dw/dt is the change in velocity;

Mlthe moment created by the force of gravity of the boat:

Mwith- the drag torque on the crankshaft.

As under the action slows down the device, the winch lowers the boat at a constant speed (i.e. dw/dt=0), then Ml-Mwith=0

Ml=T*R,

where T is the tensile force of the rope,

R is the radius of the pulley.

Mwithequals 272 N*m [3. Alwahab M.M. Engines lifeboats and boats. - Leningrad: Sudostroenie, 1980, p.21]

Calculation of torque and pulley diameter.

To determine the reactions of the supports used method of three moments. For the conversion of the specified statically indeterminate system in statically determinate must be eliminated from the excess links. This purpose is drawn up the basic system.

Discusses span 0-1

Σ M(0)=0: -q1*l

2
1
/2-q2*l2(l1+l2/2)+B1*(l1+l2)=0

B1=(q1*l

2
1
/2+q2*l2(l1+l2/2)/(l1+l2)

B1=(3714*0,732/2+6203*1,77*1,615)/2,5=7487 (H)

Σ M(1)=0: q2*l

2
2
/2+q1*l1(l2+l1/2)-A0*(l1+b)=0

A0=(q2*l

2
2
/2+q1*l1(l2+l1/2))/(l1+l2)

And0=(3714*0,73*2,135+6203*1,772/2)/2,5=6203 (H)

0≤ z≤ l1

Mp=A0*z-q1*z

2
1
/2

Mp1=A0*z; Mp2=-q1*z

2
1
/2

Mp1=(0;4547)N*m; Mp2=(0; 990) N*m

0≤ z≤ l2

Mp=B1*z-q2*z

2
1
/2

Mp1=B1*z; Mp2=-q2*z

2
1
/2

Mp1=(0;13250)N*m; Mp2=(0; 9722) N*m

Discusses the span of 1-2

Σ M(1)=0: B2*l3-q3*l

2
3
/2=0

B2=(q3*l

2
3
/2)/l3

In2=(3714*2,92/2)/2,9=5390(H)

Σ M(2)=0: A1*l3-q3*l

2
3
/2=0

And1=(q3*l

2
3
/2)/l3

A1=(3714*2,92/2)/2,9=5390(H)

0≤ z≤ l3

MR/I=1,45=5390*1,45-3714*1,452/2=3920(N*m)

Defined static moment

S1,the lion=(0,73*4528/2)*(2/3)*0,73-(0,73*990/3)*(3/4)*0,73+(1.77 in*13250/2)*(0,73+1,77/3)-(1,77*9722/3)*(0,73+1,77/4)=9428 (N*m3)

S2,rights=(2/3)*2,9*3920*2,9/2=10986(N*m3)

The data obtained are substituted in equation (1)

1500*2,5+2*M1*5,4-1500*2,9=-6*(9428/2,5+10986/2,9)

M1=4253(H*M)

To determine the reactions of the supports is considered:

the blinds 0-1

Σ M(0)=0: -M1-q1*l

2
1
/2-q2*l2(l1+l2/2)+B1*(l1+l2)+M0=0

B1=(q1*l

2
1
/2+q2*l2(l1+l2/2)+M1-M0)/(l1+l2)

B1=(3714*0,732/2+6203*1,77*near 1.615+4253-1500)/2,5=8585(H)

The span of 1-2

Σ M(2)=0: M1-M2-A1*l3+q3*l

2
3
/2=0

A1=(M1-M2+q3*l

2
3
/2)/l3

A1=(4253-1500+3714*2,92/2)/2,9=7350 (N*m)

T=A1+B1

T=8585+7350=15935 N

To overcome the drag torque must comply with the conditions Mkr>Mwith

Then Mwith<T*R

R>Mwith/T

R>272/15935=0,017 m =17 mm

Then the diameter of the pulley DW>34 mm

Calculation of beams for strength.

As the beam channel is used.

l1=2.5 m; l2=2.9 m

Defines the reaction supports.

Σ M(0)=0: -T*l1+B*(l1+l2)=0

B=T*l1/(l1+l2)

In=15935*2,5/(2,5+2,9)=7377 N

Σ M(2)=0: T*l2-A*(l1+l2)=0

A=T*l2/(l1+l2)

And=15935*2,9/(2,5+2,9)=8558 N

Defines the maximum time

Span 0-1

0≤ z≤ l1

Mx=A*z

Mx=8558*2,5=21395 N*m

Because the beam only apply bending forces, then from the condition of strength

σmax[σ ]=σt/n

where n is the safety factor (assumed equal to 1.5),

σt- the yield stress (assumed equal to 210 MPa)

σmax=Mx/Wx

Wx=Mxmax=Mx*n/σt

Wx=(21395*1,5*10-2)/210=1,53 cm3

From [2] for the given values of Wxselect the channel No. 5

Check shaft torsion

τ =T/Wk,

where Wkthe moment of resistance at the free torsion

Wk=π *d3/16-b*t(d-t)2/d

Where d is the shaft diameter,

b - the width of the key way,

t - the height of the key way.

Wk=3,14*2,93/16-0,8*0,4(2,9-0,4)2/2,9=4.1 cm3

τ ≤ [τ ]=σt/√ 3

τ 15935*2,9/4,1=11,27 N/m 2

σt11,27*√ 3=19,5 H/m2=195 MPa

This condition corresponds to the steel Article 6 GOST 1050-74. The length of the pins is equal to 70 mm

The choice of rope.

T=N

Tp- breaking strength

n=Tp/T

n is equal to 3

Tp=15935*3=48 kN

For this disruptive force in [3] is double lay rope type LK-R design 6× 19 according to GOST 2688-80 with a diameter of 9.1 mm marking group 1960(200).

Since a large number of turns of rope on the pulley will increase the torque (due to the increase in radius), which is not desirable when starting the diesel engine. Therefore, the number of turns of the rope equals 15.

Rope length is taken equal to 2.5 m

This method can significantly reduce the time of starting the diesel engine, as well as to minimize human effort.

1. Way to start the diesel engine and rescue boats, including the actuated device for manual start diesel with shaft transmitting torque to the crankshaft via a chain transmission, characterized in that on said shaft manual install the pulley from the wound thereon with one end of the rope, the other end are rigidly fixed to the transverse rod, which connects both suited to which hung the boat.

2. The device to start the diesel engine of the rescue boat, the soda is containing the shaft, transmitting torque to the crankshaft via a chain transmission, characterized in that on said shaft handheld device has a pulley with wound thereon with one end of the rope, the other end of which is fixedly mounted on a transverse rod connecting both suited to which is suspended from the boat.



 

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