CN2934595Y

CN2934595Y - Natural gas engine

Info

Publication number: CN2934595Y
Application number: CNU2006201154402U
Authority: CN
Inventors: 于洪亮; 王磊
Original assignee: HUALING DIESEL ENGINE POWER CO Ltd WEIFANG
Current assignee: HUALING DIESEL ENGINE POWER CO Ltd WEIFANG
Priority date: 2006-05-17
Filing date: 2006-05-17
Publication date: 2007-08-15
Anticipated expiration: 2016-05-17

Abstract

The utility model relates to a natural gas engine in the power engineering field and includes a cylinder body, a cylinder, a cylinder liner, a piston, a combustion chamber, a spark plug, a crankshaft-connecting rod, a gas feeding outfit, a fuel supply outfit and a lubrication outfit. The piston is arranged in the cylinder, the cylinder liner is provided with an inlet channel and a spark plug, the inlet channel is connected with the inlet pipe, the spark plug is connected with an ignition device, a concave pit is arranged in the center of the top of the piston, the concave pit is a rotary body and is cylinder-shaped, and a conical desk that is upward convex is positioned in the middle of the bottom of the concave pit. The utility model, based on the existing 4JB1 type diesel engine whose combustion chamber is improved and whose spark plug is rationally arranged to be suitable for burning natural gas, significantly saves the development costs and improves the engine performance.

Description

Natural gas engine

Technical field

The utility model relates to the natural gas engine in a kind of field of dynamic engineering.

Background technique

Oil shortage and ecological degeneration are the subject matter that the present mankind face, and shortage of energy sources will directly influence various countries' sustainable development of economy, and environmental pollution is then directly threatening human beings'health and existence.Rock gas is the important component part of world today's energy, and it and coal, oil are listed as three big pillars of world energy sources.Data shows according to the study, and the explored petroleum reserves in the world is pressed the speed that automobile consumes now, can also support 40-70.The gas reserves of verifying, expectation can be exploited 200 years.

Rock gas is a kind of energy of cleaning, and main component is a methane, and the main resultant after the burning is carbon dioxide and water, and the greenhouse gases of its generation have only 1/2 of coal, is 2/3 of oil.Gas-fueled vehicles then are the automobiles that acts as a fuel with rock gas.In recent years, gas-fueled vehicles are very fast in global evolution, and are more successful aspect application and operation.Gas-fueled vehicles are a kind of desirable low pollution cars, compare with gasoline automobile, and CO descends approximately 90% in its exhaust emissions, and it is about 50% that HC descends, and it is about 30% that NOX descends, SO ₂It is about 70% to descend, CO ₂It is about 23% to descend, and it is about 40% that particle emission can reduce, and the leadization thing can reduce by 100%.As seen the rock gas pollution on the environment is far smaller than oil and coal, is the green substitute fuel of a kind of good motor car engine.Simultaneously, the user cost of gas-fueled vehicles is lower, takes about 50% than fuel-engined vehicle fuel saving.In addition, compare with electric vehicle, the continual mileage of gas-fueled vehicles is long.The relevant expert thinks that gas-fueled vehicles are the low emission vehicles that have promotional value most at present.

Existing gas-fueled vehicles mostly are to increase the dual-fuel automobile that a cover gas combustion apparatus forms on the basis of fuel-engined vehicle, and its motor does not pass through the change of essence.Thereby cause the combustion gas performance low.Show that mainly power character is lower, natural gas fuel is compared with gasoline, and the calorific value of mixed gas is low, and air inlet (air) amount is few, and coefficient of molecular change is few, and power character descends 20% approximately.

Summary of the invention

The purpose of this utility model provides a kind of combustion efficiency height, is specifically designed to the natural gas engine of gas-firing.

For achieving the above object, the utility model adopts following technological scheme:

Natural gas engine described in the utility model, it comprises cylinder body, cylinder, cylinder head, piston, firing chamber, spark plug, connecting rod, distribution device, fuel supply mechanism, lubricating structure, piston is installed in the cylinder, intake duct and spark plug are installed on the cylinder head, and intake duct is connecting suction tude, is connecting ignition mechanism on the spark plug, center, top at piston has a pit, this pit is a solid of rotation, is cylindrical body, and there is a circular cone that raises up the centre of bottom.

The diameter of said cylinder is the 90-95 millimeter, stroke is the 100-105 millimeter, the pit diameter at the top of piston is the 60-65 millimeter, it is 5 millimeters fillet that the end face of pit and bottom surface all have radius, the diameter of circular cone end face is 20 millimeters, circular cone is 14 millimeters to the distance of pit end face, and the subtended angle of circular cone is 140 degree.

In order to obtain higher ignition energy, each spark plug connects an independently spark coil power supply.

After adopting technique scheme, the utility model utilizes existing 4JB1 type diesel engine by to the improvement of firing chamber and the reasonable Arrangement of spark plug, makes its suitable gas-firing, has saved development cost greatly, has improved the performance of motor.

The important technological parameters of existing 4JB1 diesel engine is as follows:

Pattern: in-line four cylinder, water-cooled, four-stroke, direct injection combustion chamber

Cylinder diameter * stroke (mm): 93*102

Discharge capacity (L): 2.771

Power/rotating speed (KW/r/min): 57/3600

Moment of torsion/rotating speed (N.m/r/min): 174/2000

Minimum fuel oil consumption (g/KW.h) :≤218

Compression ratio: 18.2: 1

The important technological parameters of natural gas engine:

Cylinder diameter * stroke (mm): 93*102

Discharge capacity (L): 2.771

Power/rotating speed (KW/r/min): 35/2000

Moment of torsion/rotating speed (N.m/r/min): 150/1400

Minimum gas consumption rate (g/KW.h) :≤265

Compression ratio: 12: 1

Description of drawings

Fig. 1 is the structural representation of existing 4JB1 burning chamber of diesel engine;

Fig. 2 is the plan view of Fig. 1;

Fig. 3 is the structural representation of an embodiment firing chamber of the present utility model;

Fig. 4 is the plan view of Fig. 3;

Fig. 5 is the partial structurtes schematic representation of cylinder head spark plug part.

Embodiment

In order to realize the lean combustion of natural gas engine, guarantee combustion mixture average excess air coefficient near or surpass under the situation of flammable limits and can fully burn, we change the 4JB1 diesel engine into the Spark ignition type natural gas engine, and combustion system, fuel supply system, gas handling system and control system are improved accordingly.

Shake cruelly for fear of motor, and guarantee that motor has enough scarce fire safety surplus and complete machine performance, adjusts to present 12: 1 with the compression ratio of motor by original 18.2: 1.

Consider that existing 4JB1 motor forms more intense intake swirl in cylinder, improve the combustion-chamber shape of piston 1, shorten flame travel, improve the thermal efficiency.And spark plug is arranged on the position of the former oil sprayer of cylinder head.

Like this, natural gas engine described in the utility model, it comprises cylinder body, cylinder, cylinder head, piston 1, firing chamber, spark plug 2, connecting rod, distribution device, fuel supply mechanism, lubricating structure, piston 1 is installed in the cylinder, intake duct and spark plug 2 are installed on the cylinder head, intake duct is connecting suction tude, connecting ignition mechanism on the spark plug 2, the pit 11 that has a formation firing chamber in the center, top of piston 1, this pit 11 is a solid of rotation, be cylindrical body, there is a circular cone that raises up 12 centre of bottom.

The diameter of said cylinder is 93 millimeters, stroke is 102 millimeters, pit 11 diameters at the top of piston 1 are 62 millimeters, it is 5 millimeters fillet that the end face of pit 11 and bottom surface all have radius, the diameter of circular cone 12 end faces is 20 millimeters, circular cone is 14 millimeters to the distance of pit end face, and the subtended angle of circular cone is 140 degree.

In addition, increase electronically controlled throttle valve in former gas handling system, be convenient to control the burning of mixed gas under the excess air coefficient of determining in the engine cylinder, closure is by step motor control, and its aperture is regulated at will as requested.The closure place is provided with air bypass valve, so that compensation and the air mass flow of control during idling.

The fuel supply system of this natural gas engine mainly comprises: compositions such as gas cylinder, filter, cut-out solenoid valve, reduction valve.This is existing known technology, no longer repeats at this.

Natural gas engine after the improvement because the kindling temperature of rock gas is all higher than diesel oil and gasoline, requires ignition system that high pressure and high ignition energy are provided by the original compression-ignited Spark ignition type that changes into.Ignition system mainly is made up of controller, spark coil, high voltage wire and spark plug, spark plug 2 is arranged on the position of former oil sprayer, and the angle that is inclination with piston axis is arranged.As long as on the basis of existing gasoline engine ignition system, suitably improve ignition energy as required.

In order to obtain higher ignition energy, can also be with each spark plug 2 by an independently spark coil power supply.

Claims

1, a kind of natural gas engine, it comprises cylinder body, cylinder, cylinder head (3), piston (1), the firing chamber, spark plug (2), connecting rod, distribution device, fuel supply mechanism, lubricating structure, piston (1) is installed in the cylinder, it is characterized in that: intake duct and spark plug (2) are installed on the cylinder head (3), intake duct is connecting suction tude, spark plug is connecting ignition mechanism on (2), center, top at piston (1) has a pit (11), this pit (11) is a solid of rotation, be cylindric, there is a circular cone that raises up (12) centre of bottom.

2, natural gas engine according to claim 1, it is characterized in that: the diameter of cylinder is 90---95 millimeters, stroke is 100---105 millimeters, the pit diameter at the top of piston (1) is 60---65 millimeters, it is 5 millimeters fillet that the end face of pit and bottom surface all have radius, the diameter of circular cone end face is 20 millimeters, and circular cone is 14 millimeters to the distance of pit end face, and the subtended angle of circular cone is 140 degree.

3, natural gas engine according to claim 1 and 2 is characterized in that: each spark plug (2) connects an independently spark coil power supply.