CN202176425U

CN202176425U - Combustion engine mechanical spray tube type exhaust gas recirculation system

Info

Publication number: CN202176425U
Application number: CN201120259266XU
Authority: CN
Inventors: 顾德富; 刘洋; 孙曙
Original assignee: SHANGHAI INTERNAL-COMBASTION ENGINE INST
Current assignee: SHANGHAI INTERNAL-COMBASTION ENGINE INST; Shanghai Internal Combustion Engine Research Institute
Priority date: 2011-07-21
Filing date: 2011-07-21
Publication date: 2012-03-28
Anticipated expiration: 2021-07-21

Abstract

The utility model relates to the technical field for purifying exhaust gas in combustion engine, especially relates to a combustion engine mechanical spray tube type exhaust gas recirculation system, comprising a suction flange, a circulation exhaust gas tube, an opening-degree control exhaust gas tube, an exhaust gas recirculation valve opening-degree execution mechanism, an exhaust gas recirculation valve and a gas inlet spray tube, wherein the exhaust gas recirculation valve opening-degree execution mechanism comprises an opening-degree valve, an adjustment bolt, a swing arm, a rotation axle and the exhaust gas recirculation valve; one end of the opening-degree valve in the exhaust gas recirculation valve opening-degree execution mechanism is connected with the suction flange by the opening-degree control exhaust gas tube, another end of the opening-degree valve is connected with one end of the swing arm by the adjustment bolt, another end of the swing arm is connected with the exhaust gas recirculation valve. It is only necessary to process the corresponding flange on the prior gas inlet tube without a primary sensor, a control unit CPU and an electric control execution mechanism and also without performing relative large change on the gas inlet system of the engine. The manufacture and use cost is low and the maintenance of the system is easy.

Description

Internal-combustion engine machinery jet tube gas recirculation system

Technical field

The utility model relates to the internal-combustion engines exhaust gas purifying field, relates in particular to a kind of engine exhaust gas recirculating system.

Background technique

Want combustion gas during internal combustion engine operation.Contain multiple harmful components in the waste gas, the befouling environment and the harm people's health.Harmful components wherein mainly contain carbon monoxide, hydrocarbon, oxynitrides, solid particle.The exhaust gas recirculation egr system is to one of harmful gas in the waste gas set Exhaust gas purifying device of oxynitrides.The part of I. C. engine exhaust is diluted concentration of oxygen in the fresh mixed air through EGR equipment backflow gas handling system, causes velocity of combustion to reduce; Improve the specific heat capacity of incoming mixture, thereby FT is reduced, to suppress the generation of oxynitrides.EGR is one of effective measures that reduce at present diesel engine oxynitrides discharging; Obtained widespread usage abroad; But existing egr system basically all is to control through circuit; Sensor through oxygen or other type feeds back engine operation condition, burning and emission information to motor CPU, controls exhaust gas flow and ER EGR Rate by position actuator.Though such egr system can be realized accurate control; But component are more, and required installing space is big, and manufacturing cost and use cost is high; Easy fault can't be popularized in market engine at light-duty commercial car, particularly low-speed truck that China has a large capacity and a wide range.

Summary of the invention

The utility model technical problem to be solved provides a kind of internal-combustion engine machinery jet tube gas recirculation system; The exhaust gas flow that gets into suction tude in this circulatory system is controlled by mechanical device; Acquiring of this device need not engine aspirating system is done bigger change; Manufacturing cost and use cost is extremely low, is easy to safeguard.

The utility model is achieved in that a kind of internal-combustion engine machinery jet tube gas recirculation system; Comprise exhaust flange, cycle gas pipe, aperture control flue gas leading, exhaust gas recirculation (egr) valve aperture actuator, exhaust gas recirculation valve body and air inlet jet pipe; Said exhaust gas recirculation (egr) valve aperture actuator comprises the aperture valve, regulates double-screw bolt, rocking arm, rotating shaft and exhaust gas recirculation valve; Exhaust gas recirculation (egr) valve aperture actuator is installed on the exhaust gas recirculation valve body; One end of aperture valve links to each other with exhaust flange, and the other end of aperture valve links to each other with rocking arm one end through regulating double-screw bolt, and the rocking arm the other end links to each other with exhaust gas recirculation valve through rotating shaft; Said exhaust flange is installed on the gas exhaust manifold, and two relief openings on the exhaust flange are connected with cycle gas pipe and aperture control flue gas leading respectively; The suction port of said exhaust gas recirculation valve body links to each other with the cycle gas pipe, and the air outlet is connected with the air inlet jet pipe through exhaust gas recirculation valve; The air inlet jet pipe is installed on the intake manifold, and drainage comes from the EGR gas and the fresh air that comes from the intake manifold of exhaust gas recirculation valve body.

Said air inlet jet pipe is the three-way pipe of a band Rafael nozzle shape line.

Described aperture valve is a diaphragm valve.

Described exhaust gas recirculation valve is a rotary valve.

The exhaust gas flow that gets into suction tude in the utility model internal-combustion engine machinery jet tube gas recirculation system is controlled by mechanical device; Built-in spring power in this system in the aperture valve provides the unlatching moment of rotary valve through regulating double-screw bolt; The exhaust pressure of motor provides the moment of closing of rotary valve through overcoming built-in spring power in the aperture valve; When sub load, open moment greater than closing moment, valve is in opening state; Waste gas gets into the air inlet pipeline of motor through the exhaust gas recirculation valve body, thereby reduces NO in the waste gas _XContent.When full load, open moment less than closing moment, rotary valve cuts out to guarantee the power of motor; The air inlet jet pipe adopts Rafael nozzle shape line, is intended to reduce the pressure of fresh air at air inlet jet pipe exhaust gas entrance place, and promotion waste gas mixes with fresh air.The utility model is simple in structure, compares with automatically controlled gas recirculation system, and native system need not primary transducer, control unit CPU and electrical control actuator; Acquiring of this device also need not engine aspirating system is done bigger change, only needs the corresponding flange of processing on former suction tude, just can install, and implements easily; Manufacturing cost and use cost is extremely low, is easy to safeguard.

Description of drawings

Fig. 1 looks schematic representation for the utility model internal-combustion engine machinery jet tube gas recirculation system structure master;

Fig. 2 is the utility model internal-combustion engine machinery jet tube gas recirculation system structure schematic top plan view.

Among the figure: 1 motor, 2 gas exhaust manifolds, 3 exhaust flanges, 4 cycle gas pipes, 5 apertures control flue gas leading, 6 exhaust gas recirculation (egr) valve aperture actuators, 61 aperture valves, 62 are regulated double-screw bolt, 63 rotating shafts, 64 rocking arms, 65 exhaust gas recirculation valve, 7 exhaust gas recirculation valve bodies, 8 air inlet jet pipes, 9 intake manifold, 10 intake manifolds, 11 pressurized machines.

Embodiment

Below in conjunction with specific embodiment, further set forth the utility model.Should be understood that these embodiments only to be used to the utility model is described and be not used in the restriction the utility model scope.Should be understood that in addition those skilled in the art can do various changes or modification to the utility model after the content of having read the utility model statement, these equivalent form of values fall within the application's appended claims institute restricted portion equally.

Embodiment 1

Like Fig. 1, shown in 2; A kind of internal-combustion engine machinery jet tube gas recirculation system; Comprise exhaust flange 3, cycle gas pipe 4, aperture control flue gas leading 5, exhaust gas recirculation (egr) valve aperture actuator 6, exhaust gas recirculation valve body 7 and air inlet jet pipe 8; Said exhaust gas recirculation (egr) valve aperture actuator comprises aperture valve 61, regulates double-screw bolt 62, rocking arm 63, rotating shaft 64 and exhaust gas recirculation valve 65; Exhaust gas recirculation (egr) valve aperture actuator 6 is installed on the exhaust gas recirculation valve body 7; One end of aperture valve 61 links to each other with exhaust flange 3, and the other end of aperture valve 61 links to each other with rocking arm 63 1 ends through regulating double-screw bolt 62, and rocking arm 63 the other ends link to each other with exhaust gas recirculation valve 65 through rotating shaft 64; Said exhaust flange 3 is installed on the gas exhaust manifold 2, and two relief openings on the exhaust flange 3 are connected with cycle gas pipe 4 and aperture control flue gas leading 5 respectively; The suction port of said exhaust gas recirculation valve body 7 links to each other with cycle gas pipe 4, and the air outlet is connected with air inlet jet pipe 8 through exhaust gas recirculation valve 65; Air inlet jet pipe 8 is installed on the intake manifold 9, and drainage comes from the EGR gas and the fresh air that comes from intake manifold 10 of exhaust gas recirculation valve body 7.

Aperture valve 61 is a diaphragm valve in the present embodiment; One end of aperture valve 61 links to each other with the exhaust pressure of induction generator with exhaust flange 3 through aperture control flue gas leading 5; The other end of aperture valve 61 links to each other with rocking arm 63 1 ends through regulating double-screw bolt 62; Diaphragm valve pushes away, draws rocking arm 63 under the acting in conjunction of its built-in spring power and engine back pressure, rocking arm 63 the other ends link to each other with exhaust gas recirculation valve 65 through rotating shaft 64, and rotating shaft 64 issues the male character types in Chinese operas, usu. referring tov the bearded character displacement in the effect that pushes away, draws of rocking arm 63; The aperture that realizes exhaust gas recirculation valve 65 changes, and the initial opening of exhaust gas recirculation valve 65 can be realized by regulating double-screw bolt 62 adjustment.

In the present embodiment, said air inlet jet pipe 8 is the three-way pipe of a band Rafael nozzle shape line, and air inlet jet pipe 8 links to each other with intake manifold 10, intake manifold 9 and exhaust gas recirculation valve body 7 respectively.Fresh air gets into air inlet jet pipe 8 through intake manifold 10; Under the effect of your shape line of daraf(reciprocal of farad); The suction pressure here reduces, flow velocity increases, and the engine exhaust that better drainage comes from exhaust gas recirculation valve body 7 mixes with the fresh air that comes from intake manifold 10 through intake manifold 9 entering engine cylinder-bodies 1.

During work: the discharging waste gas through engine cylinder-body 1 is divided into three strands at exhaust flange 3 places: discharge after first strand of most of waste gas directly flows to pressurized machine 11 work; Second burst of few part gets into intake manifold 9 down through cycle gas pipe 4, exhaust gas recirculation valve body 7 and the drainage that has an air inlet jet pipe 8 of Rafael nozzle shape line.The control of exhaust gas flow is that the charge flow rate through motor, the acting in conjunction of engine exhaust pressure realize.Double-screw bolt 6-is regulated in adjustment, makes exhaust gas recirculation valve 65 before motor is opened, be in suitable aperture; Behind engine start; The 3rd strand of waste gas gets into aperture valve 61 through aperture control flue gas leading 5; The exhaust gas pressure that gets in the aperture valve 61 changes along with the variation of engine operation condition; When engine back pressure during greater than the intrinsic spring force of aperture valve 61, aperture valve 61 promotes rocking arms 63 through regulating double-screw bolt 62, exhaust gas recirculation valve 65 is applied one close moment.Exhaust gas recirculation valve 65 apertures reduce with the power increase of motor; When full engine load was moved, the valve Close All was to guarantee the power of motor.The air inlet jet pipe is your shape of daraf(reciprocal of farad) line gas-entered passageway of gradual shrinkage in this device, can produce the suction function with engine intake airflow/rotating speed associated, helps the suction of engine exhaust.

Claims

1. internal-combustion engine machinery jet tube gas recirculation system; Comprise exhaust flange (3), cycle gas pipe (4), aperture control flue gas leading (5), exhaust gas recirculation (egr) valve aperture actuator (6), exhaust gas recirculation valve body (7) and air inlet jet pipe (8); It is characterized in that: said exhaust gas recirculation (egr) valve aperture actuator comprises aperture valve (61), regulates double-screw bolt (62), rocking arm (63), rotating shaft (64) and exhaust gas recirculation valve (65); Exhaust gas recirculation (egr) valve aperture actuator (6) is installed on the exhaust gas recirculation valve body (7); One end of aperture valve (61) links to each other with exhaust flange (3); The other end of aperture valve (61) links to each other with rocking arm (63) one ends through regulating double-screw bolt (62), and rocking arm (63) the other end links to each other with exhaust gas recirculation valve (65) through rotating shaft (64); Said exhaust flange (3) is installed on the gas exhaust manifold (2), and two relief openings on the exhaust flange (3) are connected with cycle gas pipe (4) and aperture control flue gas leading (5) respectively; The suction port of said exhaust gas recirculation valve body (7) links to each other with cycle gas pipe (4), and the air outlet is connected with air inlet jet pipe (8) through exhaust gas recirculation valve (65); Air inlet jet pipe (8) is installed on the intake manifold (9), and drainage comes from the EGR gas and the fresh air that comes from intake manifold (10) of exhaust gas recirculation valve body (7).

2. internal-combustion engine machinery jet tube gas recirculation system as claimed in claim 1 is characterized in that: said air inlet jet pipe (8) is the three-way pipe of a band Rafael nozzle shape line.

3. according to claim 1 or claim 2 internal-combustion engine machinery jet tube gas recirculation system, it is characterized in that: described aperture valve (61) is a diaphragm valve.

4. according to claim 1 or claim 2 internal-combustion engine machinery jet tube gas recirculation system, it is characterized in that: described exhaust gas recirculation valve (65) is rotary valve.