CN201241750Y

CN201241750Y - Natural gas engine

Info

Publication number: CN201241750Y
Application number: CNU2008201374473U
Authority: CN
Inventors: 缪雪中
Original assignee: ZHEJIANG GONOW AUTO CO Ltd
Current assignee: ZHEJIANG GONOW AUTO CO Ltd
Priority date: 2008-08-25
Filing date: 2008-08-25
Publication date: 2009-05-20
Anticipated expiration: 2018-08-25

Abstract

The utility model relates to a natural gas engine, belonging to the gas engine technical field, which comprises a cylinder body, a cylinder, a cylinder cover, a piston, a combustion chamber, a spark plug, a crank connecting rod mechanism, a gas distributing mechanism, a fuel feed system and a lubricating system, wherein the piston is mounted in the chamber of the cylinder. The natural gas engine is characterized in that the cylinder is provided with a gas intake channel, an exhaust channel and the spark plug communicated with the chamber of the cylinder, the gas intake channel is communicated with the fuel feed system, the exhaust channel is communicated with an exhaust pipe, the spark plug is connected with an ignition device, the middle at the top of the plug is downwards provided with a round concave of bathtub type, and the middle bottom of the round concave is provided with a circular cone protruded upwards. The utility model adopts a prior 4JA1 diesel engine, redesigns the combustion chamber and reasonable arranges the spark plug, to adapt the engine for natural gas combustion, thereby saving development cost and improving engine performance.

Description

Natural gas engine

Technical field:

The utility model belongs to the gas engine technical field, refers in particular to a kind of natural gas engine.

Background technique:

Oil shortage and ecological degeneration are the subject matter that the present mankind face, energy shortage will directly influence various countries' sustainable development of economy, environmental pollution then directly influences human beings'health and existence, rock gas is three big pillars of world today's energy, data shows according to the study, and the explored petroleum reserves in the world also can support about 70 years, and gas reserves, can be for exploitation about 200 years.

Rock gas is a kind of energy of cleaning, and main component is a methane, and the main component after the burning is water and carbon dioxide, the greenhouse gases of its generation have only coal 1/2, oil 2/3.Gas-fueled vehicles are to be the automobile of fuel with the rock gas, and in recent years, gas-fueled vehicles are very fast in global evolution, very successful aspect application and operation, gas-fueled vehicles are a kind of desirable low pollution cars, and it is compared with gasoline car, CO in its exhaust emissions can descend 90%, and it is about 50% that CH 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 this shows that rock gas is far smaller than oil and coal to the pollution of environment, is a kind of green alternative energy resources of good automobile.Simultaneously, the user cost of gas-fueled vehicles is lower, has only 50% of former fuel vehicle.In addition, compare with electric vehicle, the continual mileage of gas-fueled vehicles is long.Therefore, gas-fueled vehicles become the low emission vehicle that has promotional value at present.

Existing gas-fueled vehicles mostly are the dual-fuel automobiles that increases by a cover gas combustion apparatus on the basis of fuel-engined vehicle, its motor does not have the change of essence, it is best that thereby the performance that causes gas engine does not reach, show that mainly power character is relatively poor, power descends about about 10～15%, Fig. 1, Fig. 2 have provided the piston 1 of 4JB1 diesel engine and the structural representation of firing chamber 2 in the prior art, and diesel engine changes single-fuel engine into, need be optimized design to firing chamber and compression ratio, be better than former diesel engine to guarantee its power performance.

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

The purpose of this utility model is achieved in that

Natural gas engine, include cylinder block, cylinder, cylinder head, piston, the firing chamber, spark plug, connecting rod, distribution device, fuel supply system, lubrication system, piston is installed in the cylinder inner cavity, it is characterized in that: cylinder head is provided with the gas inlet passage that communicates with cylinder inner cavity, air outlet flue and spark plug, gas inlet passage and fuel supply system UNICOM, air outlet flue and outlet pipe UNICOM, spark plug is connected with ignition mechanism, to the circular pit that is arranged with the bathtub formula, a circular cone that raises up is arranged at the middle part of circular pit bottom surface at the middle part at the top of piston.

The diameter of above-mentioned cylinder is 93mm, the stroke of piston is 90～95mm, the upper base diameter of circular pit is 66～70mm, it is the fillet of 6～8mm that all there is radius the end face of circular pit and bottom surface, the diameter of circular cone upper base is 18～19mm, the upper base of circular cone 12 is 10.5～11.9mm to the distance of piston 10 end faces, and the angle of circular cone is 160～170 degree.

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

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, greatly reduces development cost, has improved the performance of motor.

The important technological parameters contrast of 4JA1 natural gas engine of the present utility model and existing 4JA1 diesel engine is as follows:

The important technological parameters of existing 4JA1 diesel engine is as follows:

Pattern: array, four cylinders, water-cooled, four-stroke, direct injection combustion chamber

Bore/stroke (mm): 93 * 92

Discharge capacity (L): 2.499

Power/rotating speed (kw/r/min): 50/3600

Maximum Torque/rotating speed (N.m/r/min): 160/2000～2300

Compression ratio: 18.2:1

The important technological parameters of 4JA1 natural gas engine of the present utility model:

Bore/stroke (mm): 93 * 92

Discharge capacity (L): 2.499

Power/rotating speed (kw/r/min): 52/3600

Maximum Torque/rotating speed (N.m/r/min): 160/2000～2300

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 piston of the present utility model and firing chamber;

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

Fig. 5 is the partial enlarged drawing of Fig. 3.

Embodiment:

With specific embodiment the utility model is further described below, referring to Fig. 3-5:

In order to realize the lean combustion of natural gas engine, guarantee mixed gas average excess air coefficient near or surpass under the situation of flammable limits and can fully burn, we change the 4JA1 diesel engine into the Spark ignition type natural gas engine, and combustion system, air inlet supply system and control system have been carried out relating to accordingly improvement.

For fear of engine knock, the compression ratio of motor is adjusted to present 12:1 by original 18.2:1, consider that existing 4JA1 motor forms stronger intake swirl in cylinder, improve the combustion-chamber shape of former diesel motor piston, shorten flame travel, improve the thermal efficiency, and spark plug is arranged on the position of the former oil sprayer of cylinder head.

Natural gas engine, include cylinder block, cylinder, cylinder head, piston, the firing chamber, spark plug, connecting rod, distribution device, fuel supply system, lubrication system, piston is installed in the cylinder inner cavity, it is characterized in that: cylinder head is provided with the gas inlet passage that communicates with cylinder inner cavity, air outlet flue and spark plug, gas inlet passage and fuel supply system UNICOM, air outlet flue and outlet pipe UNICOM, spark plug is connected with ignition mechanism, to the circular pit 11 that is arranged with the bathtub formula, one circular cone that raises up 12 is arranged at the middle part at the top of piston 10 at the middle part of circular pit 11 bottom surfaces.

The diameter D1 of above-mentioned cylinder is 93mm, the stroke of piston is 92mm, the upper base diameter D2 of circular pit is 66mm, it is the fillet of R1=R2=7mm that all there is radius the end face of circular pit 11 and bottom surface, the diameter D3 of circular cone 12 upper bases is 18mm, the upper base of circular cone 12 is 11.8mm to the distance H 1 of piston 10 end faces, and the included angle B 1 of circular cone is 167 degree.

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

In addition, under the excess air coefficient of determining, burn, in gas handling system, increase closure for guaranteeing motor, by the λ value of lambda sensor feedback, the aperture of control closure and the air inflow of rock gas.

The fuel supply system of this natural gas engine mainly comprises: steel cylinder, solenoid valve, reduction valve, pressure duct and rock gas filter cleaner etc., this is existing known technology, no longer repeats at this.

Natural gas engine after the improvement is by the original compression-ignited Spark ignition type that changes into, because the burning-point of rock gas is higher, require ignition system that high ignition energy is provided, ignition system mainly is made up of spark coil, high voltage wire and spark plug, spark plug is arranged on the position of former oil sprayer, the angle that is inclination with piston axis is arranged.

The foregoing description only is one of preferred embodiment of the present utility model; be not to limit practical range of the present utility model with this; so: all equivalences of doing according to shape of the present utility model, structure, principle change, and all should be covered by within the protection domain of the present utility model.

Claims

1, natural gas engine, include cylinder block, cylinder, cylinder head, piston, the firing chamber, spark plug, connecting rod, distribution device, fuel supply system, lubrication system, piston is installed in the cylinder inner cavity, it is characterized in that: cylinder head is provided with the gas inlet passage that communicates with cylinder inner cavity, air outlet flue and spark plug, gas inlet passage and fuel supply system UNICOM, air outlet flue and outlet pipe UNICOM, spark plug is connected with ignition mechanism, to the circular pit that is arranged with the bathtub formula, a circular cone that raises up is arranged at the middle part of circular pit bottom surface at the middle part at the top of piston.

2, natural gas engine according to claim 1, it is characterized in that: the diameter of described cylinder is 93mm, the stroke of piston is 90～95mm, the upper base diameter of circular pit is 66～70mm, it is the fillet of 6～8mm that all there is radius the end face of circular pit and bottom surface, the diameter of circular cone upper base is 18～19mm, and the upper base of circular cone (12) is 10.5～11.9mm to the distance of piston (10) end face, and the angle of circular cone is 160～170 degree.