CN200996316Y - Multi-pulse conversion exhaust of straight-eight engine - Google Patents

Abstract

The utility model discloses a multi-pulse conversion exhaust device for an 8-cylinder in-line diesel engine. The exhaust pipe is divided into two sections with the same structure, each section of the exhaust pipe has four air inlets and two air outlets, and each section of the exhaust pipe is provided with two flow channels in parallel, of which the adjacent two air inlets The outlets share a flow channel and an air outlet, and the two air inlets on opposite sides share a flow channel and an air outlet. The two air outlets are arranged side by side on the side adjacent to the air inlet side of each exhaust pipe. Middle part; an exhaust pipe pulse converter communicated with the turbocharger on the diesel engine is arranged on the gas outlet of the two sections of the exhaust pipe. The exhaust device of the utility model has simple manufacture and assembly process, small overall volume and low cost, solves the problem of mutual interference between the exhaust of each cylinder, makes the exhaust of the engine unimpeded, and obtains good engine performance.

Description

8 cylinder straight-row diesel engine multi-pulse conversion exhausting devices

Technical field

The utility model relates to the venting gas appliance on a kind of turbocharged diesel engine, especially a kind of cylinder number that is used for is 8, ignition order is the multi-pulse conversion exhausting device on the turbocharged diesel engine in upright arrangement of 1-6-2-4-8-3-7-5, to solve the problem of phase mutual interference between each cylinder exhaust.

Background technique

The firing interval angle of 8 cylinder straight-row diesel engines is: 720 °/8=90 °, ignition order is 1-6-2-4-8-3-7-5.Because 1-2-3-4 cylinder situation is identical with 5-6-7-8 cylinder situation, only analyzes 1-2-3-4 cylinder situation and gets final product.According to 1-4 cylinder exhaust phase bitmap shown in Figure 9, analyze each cylinder exhaust disturbed condition, draw to draw a conclusion:

1), the 1st cylinder is got angry back 180 ℃ of A the 2nd cylinder initial burning.Because 180 ℃ of A of the 2nd cylinder lag of ignition the 1st cylinder, when promptly the 1st cylinder exhaust entered scavenging period in latter stage, the 2nd cylinder just began exhaust, and house steward's internal pressure rises, and the 1st cylinder scavenging can't normally be carried out, even phenomenon occurs pouring in down a chimney.

2), the 4th cylinder is got angry back 180 ℃ of A the 3rd cylinder initial burning.Because 180 ℃ of A of the 3rd cylinder lag of ignition the 4th cylinder, when promptly the 4th cylinder exhaust entered scavenging period in latter stage, the 3rd cylinder just began exhaust, and house steward's internal pressure rises, and the 4th cylinder scavenging can't normally be carried out, even phenomenon occurs pouring in down a chimney.

3), the 2nd cylinder is got angry back 90 ℃ of A the 4th cylinder initial burning.Because 90 ℃ of A of the 4th cylinder lag of ignition the 2nd cylinder, when promptly the 2nd cylinder exhaust entered scavenging period in latter stage, the 4th cylinder just began exhaust, and house steward's internal pressure rises, and the 2nd cylinder scavenging can't normally be carried out, even phenomenon occurs pouring in down a chimney.

4), the whole exhaust process of the 3rd cylinder almost is not subjected to the influence of other cylinder exhausts.

According to above analysis to port timing, knowing only needs the cylinder of exhaust generation phase mutual interference is separated, and just can avoid the exhaust interference problem of 8 cylinder machines well, makes the exhaust of motor unimpeded, obtains good engine performance.Yet when the cylinder of exhaust generation phase mutual interference is separated, often all brought the vent systems difficult arrangement, increase the venting gas appliance volume, problems such as manufacture cost height, as the patent No. is the Chinese utility model patent of " 200520124812.3 ", a kind of multi-runner type diesel exhaust gas pipe arrangement is disclosed, comprise the exhaust branch pipe that many one ends are connected with cylinder of diesel engine respectively, the other end of described exhaust branch pipe interconnects and is formed as one outlet pipe, and described outlet pipe is provided with the outlet pipe pulse converter that is communicated with turbosupercharger on the diesel engine.The multi-runner type diesel exhaust gas pipe arrangement of this structure, though can solve the problem that the gas of motor discharge pours in down a chimney to the firing chamber, its complex structure, volume is big, influences the layout of other parts on the diesel engine.And when adopting the vent systems of simple-arranged, have the exhaust interference problem, engine performance is worsened.Generally be difficult in this two aspect of exhaust system structure and engine performance and all obtain satisfied requirement.

Summary of the invention

The technical problems to be solved in the utility model is the problem that has phase mutual interference between each cylinder exhaust at existing diesel exhaust gas pipe arrangement, a kind of multi-pulse conversion exhausting device is provided, make 8 cylinders turbocharged diesel engine in upright arrangement when making full use of pulse energy, can avoid each cylinder exhaust to disturb again well.

For solving the problems of the technologies described above, the utility model comprises the outlet pipe that is connected with the straight-row diesel engine cylinder, have the suction port that is connected to successively on each cylinder of straight-row diesel engine on the outlet pipe, its structural feature is that described outlet pipe is divided into identical two sections of structure, every section outlet pipe has four suction ports and two air outlets, walk abreast in every section outlet pipe and be provided with two runners, the shared runner of two wherein adjacent suction ports and an air outlet, be in the shared runner of two suction ports and an air outlet on relative both sides, two air outlets are located at every section outlet pipe middle side part adjacent with air inlet side side by side; Be provided with the outlet pipe pulse converter that is communicated with turbosupercharger on the diesel engine on the air outlet of two sections outlet pipes.

Described outlet pipe pulse converter has the pulse runner that is symmetrical set, the underpart of each pulse runner is provided with two suction ports of corresponding setting with two air outlets on the described outlet pipe, and the top of outlet pipe pulse converter is provided with the air outlet that is communicated with turbosupercharger.

The intermediate portion of each runner in described every section outlet pipe is provided with the cut water to the direction projection of its air outlet.

After adopting said structure, the utility model is divided into identical two sections of structure, the shared outlet pipe of 1,2,3,4 these four cylinders, the shared outlet pipe of 5,6,7,8 these four cylinders with 8 cylinder straight-row diesel engine outlet pipes.1-4, each shared runner of 2-3 two cylinders is up introduced one of them suction port of pulse converter from the outlet pipe middle part together; 5-8, each shared runner of 6-7 two cylinders is up introduced another suction port of pulse converter together from outlet pipe middle part.Last engine exhaust enters pressurized machine from two runners outflows of pulse converter, forms double pulsing.The utility model walks abreast in every section outlet pipe and is provided with two runners, the device overall volume is reduced, and the suction port that is connected on each cylinder of straight-row diesel engine is arranged in parallel, butt joint is convenient, therefore the outlet pipe manufacturing and the assembly technology of the utility model employing are simple, cost is low, this outlet pipe adds that the structural configuration of pulse converter is also very simple, thoroughly solved the problem of phase mutual interference between each cylinder exhaust, improved the performance of motor greatly, make the exhaust of motor unimpeded, obtain good engine performance.And the intermediate portion of each runner in every section outlet pipe is provided with the cut water to the direction projection of its air outlet, can avoid answering back to of the interior air-flow of runner, reduces the loss of exhaust energy.

Description of drawings

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail:

Fig. 1 is the overall structure schematic representation of the utility model venting gas appliance;

Fig. 2 is the overall structure schematic representation of one section outlet pipe among Fig. 1;

Fig. 3 is the cross section structure schematic representation of Fig. 2;

Fig. 4 is the A-A part section structural representation of Fig. 3;

Fig. 5 is the overall structure schematic representation of pulse converter among Fig. 1;

Fig. 6 is the B-B cross-sectional view of Fig. 5;

Fig. 7 is that the D of Fig. 6 is to partial view;

Fig. 8 is the C-C cross-sectional view of Fig. 6;

Fig. 9 is a 1-4 cylinder exhaust phase bitmap.

Embodiment

With reference to accompanying drawing, this 8 cylinder straight-row diesel engine multi-pulse conversion exhausting device comprises the outlet pipe 1 that is connected with the straight-row diesel engine cylinder, have the suction port 3 that is connected to successively on each cylinder of straight-row diesel engine on the outlet pipe 1, outlet pipe 1 is divided into identical two sections of structure, the shared one section outlet pipe of the 1-2-3-4 cylinder of straight-row diesel engine, the shared one section outlet pipe of 5-6-7-8 cylinder.Every section outlet pipe 1 has four suction ports 3 and two air outlets 5, walk abreast in every section outlet pipe 1 and be provided with two runners 4, wherein adjacent two suction ports, 3 a shared runner 4 and air outlets 5, be in two suction ports, 3 a shared runner 4 and air outlets 5 on relative both sides, the i.e. shared outlet pipe of 1,2,3,4 these four cylinders, the shared outlet pipe of 5,6,7,8 these four cylinders.1-4, each shared runner of 2-3 two cylinders is up introduced one of them suction port of pulse converter from the outlet pipe middle part together; 5-8, each shared runner of 6-7 two cylinders is up introduced another suction port of pulse converter together from outlet pipe middle part, and two air outlets 5 on every section outlet pipe 1 are located at every section outlet pipe 1 middle side part adjacent with suction port 3 sides side by side, form two the outlet.The intermediate portion of each runner 4 in every section outlet pipe 1 is provided with the cut water 9 to the direction projection of its air outlet 5, to avoid answering back to of air-flow in the runner, reduces the loss of exhaust energy.On the air outlet 5 of two sections outlet pipes 1, be provided with the outlet pipe pulse converter 2 that is communicated with turbosupercharger on the diesel engine.This outlet pipe pulse converter 2 has the pulse runner 7 that is symmetrical set, the underpart of each pulse runner 7 be provided with described outlet pipe 1 on two suction ports 8 of two air outlets, 5 corresponding settings, the top of outlet pipe pulse converter 2 is provided with the air outlet 6 that is communicated with the turbine inlet of turbosupercharger, two of being arranged side by side about being in this air outlet 6 form double pulsing.The outlet pipe of this structure and the pulse converter manufacturing is simple, cost is low, be easy to arrange, volume is little has solved the problem of phase mutual interference between each cylinder exhaust again simultaneously, has improved the performance of motor.

Claims (3)

1. A multi-pulse conversion exhaust device for an 8-cylinder in-line diesel engine, comprising an exhaust pipe (1) connected to the cylinder of the in-line diesel engine, and the exhaust pipe (1) is provided with an air inlet connected to each cylinder of the in-line diesel engine in turn (3), characterized in that the exhaust pipe (1) is divided into two sections with the same structure, and each section of the exhaust pipe (1) has four air inlets (3) and two air outlets (5), Each section of the exhaust pipe (1) is provided with two flow passages (4) in parallel, in which two adjacent air inlets (3) share one flow passage (4) and one air outlet (5), which are located on opposite sides The two air inlets (3) share one flow channel (4) and one air outlet (5), and the two air outlets (5) are arranged side by side on each exhaust pipe (1) and the air inlet (3) side Adjacent to the middle part of one side; an exhaust pipe pulse converter (2) communicated with a turbocharger on the diesel engine is provided on the gas outlets of the two sections of exhaust pipes (1). 2. The multi-pulse conversion exhaust device for an 8-cylinder in-line diesel engine according to claim 1, characterized in that the exhaust pipe pulse converter (2) has a left-right symmetrical pulse channel (7), each pulse The lower end of the runner (7) is provided with two air inlets (8) corresponding to the two air outlets (5) on the exhaust pipe (1), and the exhaust pipe pulse converter (2) The top of the top is provided with the air outlet (6) that is communicated with turbocharger. 3. The multi-pulse conversion exhaust device for an 8-cylinder in-line diesel engine according to claim 1, characterized in that the middle part of each flow channel (4) in each section of the exhaust pipe (1) is provided with an outlet to it. A septum (9) protruding in the direction of the air port (5).

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