CN201546793U

CN201546793U - Diesel engine exhaust pipe piping structure

Info

Publication number: CN201546793U
Application number: CN2009202494528U
Authority: CN
Inventors: 熊军; 李大军; 王召
Original assignee: CNR Dalian Locomotive and Rolling Stock Co Ltd
Current assignee: CRRC Dalian Co Ltd
Priority date: 2009-11-27
Filing date: 2009-11-27
Publication date: 2010-08-11
Anticipated expiration: 2019-11-27

Abstract

The utility model relates to a diesel engine exhaust pipe piping structure, which is characterized in that single exhaust main pipes are serially connected with each other through a corrugated pipe to form an exhaust pipe main pipe piping system, one end of the exhaust main pipe piping system is connected with a diesel engine turbocharger, and an angle between the axis of a branch pipe section of the single exhaust header pipe and the axis of the main pipe section is of an acute angle; and the pipe pore of the single exhaust header pipe branch pipe section, which is connected with the main pipe section, is reduced. The pipe core of the exhaust main pipe, which is connected with the diesel engine turbocharger, is enlarged. The angle between the axis of the branch pipe section of the single exhaust header pipe and the axis of the main pipe section can be 30 to 50 degrees. The pipe core of the single exhaust header pipe branch pipe section, which is connected with the main pipe section, is reduced by 25 percent. The diesel engine exhaust pipe piping structure has the advantages that: when the exhaust pipe piping structure is arranged in a small space, and the limit of the 240ZJ diesel engine can be realized; the quantity of the turbocharger for the diesel engine is reduced from two to one, so the oil-water pipeline arrangement can be simplified; the novel exhaust pipe piping structure with a structure which is serially connected with a pulse conversion MPC form can prevent the large scavenging interference, can increase the scavenging quantity and can ensure the uniform scavenging among different oil cylinders; and partial load performance of the diesel engine can be optimized.

Description

A kind of Diesel Engine Exhaust Pipe tube structure

Technical field the utility model relates to a kind of Diesel Engine Exhaust Pipe tube structure.

Background technique 240ZJ diesel engine pressurization system is constant pressure supercharging, mainly is made up of exhaust-gas turbocharger, air intercooler, suction tude piping and outlet pipe piping.For existing Diesel Engine Exhaust Pipe piping, mitre joint is bordering on 90 ° between tubular portion and the house steward, thereby the air-flow major part that makes the single-unit exhaust manifold prop up pipeline section can vertically enter exhaust manifold, cause big flow perturbation loss, and its adjacent cylinder exhaust can strengthen also to its scavenging interference.In a word, unfavorable to scavenging, flow losses are big, the poor-performing during work of diesel engine sub load, and this structure Design form is unfavorable for the requirement of diesel engine of locomotive gauge simultaneously, makes the diesel engine overall height tend towards superiority.

Summary of the invention: the purpose of this utility model is to overcome deficiency of the prior art, and the angle that the single-unit exhaust manifold props up pipeline section axis and total pipeline section axis changes acute angle into, the diesel engine overall height is lowered, and help scavenging.

The technical solution of the utility model is: the single-unit exhaust manifold constitutes the exhaust manifold piping by the bellows series connection, one end of exhaust manifold piping links to each other with diesel pressure booster, and the angle that the single-unit exhaust manifold props up pipeline section axis and total pipeline section axis is acute angle (30 °-50 °); Each single-unit exhaust manifold props up the pore reducing 25% that pipeline section links to each other with total pipeline section; The pore enlarging of the exhaust manifold that links to each other with diesel pressure booster.

New structure outlet pipe tube structure innovation and creation content: a. diesel engine supercharging form still is a constant pressure supercharging, but similar serial connection pulses switch MPC form on the outlet pipe tube structure: serial connection be each cylinder arm waste gas when entering house steward form class be similar to serial fashion; Pulse is pulse pressure-charging, refers to that each cylinder waste gas directly enters turbosupercharger and drives turbine; The MPC form be in each cylinder arm exhaust flow to house steward in exhaust flow to certain angle is arranged.Above-mentioned three combines the serial connection pulses switch MPC form that is; B. the pressurized machine of diesel engine dress usefulness becomes one by two before improving; C. single gas house steward diesel engine two ends pressurized machine air inlet becomes single gas house steward diesel engine one end pressurized machine air inlet.

Follow fluid mechanics principle, change the single-unit exhaust manifold and insert the exhaust manifold structure, make the exhaust flow that comes out from cylinder head to exhaust manifold exhaust flow to roughly consistent, make when waste gas enters exhaust manifold in the single-unit exhaust manifold, acutangulate with house steward, each single-unit exhaust manifold links to each other with exhaust manifold and contraction, pore reducing 25% partly occur simultaneously, form larynx shape structure, can stop airflow reflux; In addition, carry out the enlarging structural design, certain diffusion action is arranged when making waste gas enter booster turbine like this for exhaust manifold internal diameter near the booster turbine entrance point.

Compared with prior art the utlity model has following advantage: a. at small space arranging exhaust air pipe tube structure, can reach 240ZJ diesel engine gauge purpose; B. the diesel engine dress becomes one with pressurized machine by two, can simplify corresponding profit line arrangement; C. be similar to the new structure outlet pipe tube structure of serial connection pulses switch MPC form, can avoid scavenging big between each cylinder to disturb, strengthen swept volume and make each cylinder scavenging even; D. can reach and optimize diesel engine part load performance purpose.

Description of drawings

Fig. 1 is existing single-unit exhaust manifold cross-sectional view.

Fig. 2 is a single-unit exhaust manifold cross-sectional view of the present utility model.

Fig. 3 is a single-unit enlarging design exhaust manifold cross-sectional view of the present utility model.

Fig. 4 is an exhaust manifold tube structure schematic representation of the present utility model.

Embodiment now further specifies the utility model in conjunction with the accompanying drawings:

Find out from accompanying drawing 1, before the improvement, in the arm exhaust flow to house steward in exhaust flow to becoming 90 ° of angles, so the waste gas major part can vertically enter house steward in the arm, will cause big flow perturbation loss.Simultaneously the diesel engine dress is with two pressurized machines, and its intake type be that exhaust flow is to the two ends air inlet among the house steward, so exhaust is bound to that big scavenging interference will be arranged between the adjacent cylinder.In addition, 90 ° of angle structural types between arm and the house steward are unfavorable for the requirement of diesel engine gauge, and the diesel engine overall height will be tended towards superiority.

Find out from accompanying drawing 2, in the exhaust manifold arm of the present utility model exhaust flow to house steward in exhaust flow to becoming 40 ° of angles, form MPC structural type, diesel engine is adorned with a pressurized machine, its intake type be among the house steward exhaust flow to an end air inlet, make in the arm exhaust flow exhaust flow in basic and house steward can reduce the flow perturbation loss like this, reduce the scavenging interference between the adjacent cylinder to consistent.The pore reducing 25% that each single-unit exhaust manifold links to each other with exhaust manifold can stop the backflow of waste gas among the house steward like this.In addition, 40 ° of angle structural types can reduce the diesel engine overall height between each single-unit exhaust manifold and the exhaust manifold, help the requirement of diesel engine gauge.

Find out that from accompanying drawing 3 the exhaust manifold structural type near the pressurized machine end of the present utility model when this structural type meets the structural design of accompanying drawing 2, has been carried out the enlarging design, like this waste gas among the house steward is had diffusion action, can improve exhaust gas utilization efficient.

Find out from accompanying drawing 4, single-unit exhaust manifold 1 and single-unit exhaust manifold 3 constitute the exhaust manifold piping by bellows 2 series connection, one end of exhaust manifold 3 links to each other with diesel pressure booster 4, and the axis of single-unit exhaust manifold 1 and 3 pipeline sections is 40 ° with the axis angle of total pipeline section; The pore reducing 25% that single-unit exhaust manifold 1 and 3 pipeline section link to each other with total pipeline section.The pore enlarging of the exhaust manifold 3 that links to each other with diesel pressure booster 4.

Claims

1. Diesel Engine Exhaust Pipe tube structure, the single-unit exhaust manifold constitutes the exhaust manifold piping by the bellows series connection, and it is characterized in that: an end of exhaust manifold piping links to each other with diesel pressure booster; The angle that the single-unit exhaust manifold props up pipeline section axis and total pipeline section axis is an acute angle; The single-unit exhaust manifold props up the pore reducing that pipeline section links to each other with total pipeline section.

2. Diesel Engine Exhaust Pipe tube structure according to claim 1 is characterized in that: the pore enlarging of the exhaust manifold that links to each other with diesel pressure booster.

3. Diesel Engine Exhaust Pipe tube structure according to claim 1 is characterized in that: the angle that the single-unit exhaust manifold props up pipeline section axis and total pipeline section axis can be 40 °.

4. Diesel Engine Exhaust Pipe tube structure according to claim 1 is characterized in that: the single-unit exhaust manifold props up the pore reducing 25% that pipeline section links to each other with total pipeline section.