SU1216386A1 - Exhaust manifold of two-stroke internal combustion engine - Google Patents

Description

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The invention relates to the field of mechanical engineering, namely engine building, and can be used in exhaust devices of two-stroke internal combustion engines.

The aim of the image is to reduce the hydraulic resistance of the exhaust manifold of a two-stroke internal combustion engine.

FIG. Figure 1 shows the design of the proposed exhaust manifold; FIG. 2 is a section A-A in FIG. 1,

The exhaust manifold contains a cylindrical shell 1 with a partition wall 2, two gas vents 3 and 4 for separate removal of gases from two groups of cylinders 5 and 6 and guide vanes 7 with inter-blade channels 8 installed in the exhaust manifolds 9.

The partition 2 and the flue cavities 3 and 4 are located inside the shell 1.-Cavities 3 and 4 are separated by the partition 2 and connected via exhaust nozzles 9 to the corresponding cylinder group 5 and 6. Inter-blade channels 8 are equipped with mortars 10 with a minimum cross-section. The central axis 11 of the shell 1 and the axis 12 of the entrance window 13 are located in the longitudinal plane 14 of the shchindrov 5 and 6.

The guide vanes 7 are installed between the two walls 15 and 16 of the exhaust pipes 9.

The vapor spaces 3 and 4. are made in the form of an oval, the partition 2 is in the form of a part of the oval, one of the walls 15 of each exhaust pipe 9 is made with a smooth connection to the partition 2 and a part of the wall connecting the cylinder 5, 6, is placed under angle of 17 to the longitudinal plane of 14 cylinders. Angle 17 is equal to 14-18. The other wall 16 is arranged in such a way that each interscapular channel 8 of the exhaust pipe 9 is made first narrowing along the pelvis, to a minimum

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The throat section 10, and then expanding with a smooth connection to the raf-outlet cavity 4. The partition 2 is placed between the discharge lines 3 and 4 in the center of the shell 1 and is located at an angle of 18 to the longitudinal plane of 14 cylinders. Angle 18 is equal to 72-90 °. The ratio of the distance is 19 from the entrance window. 13 to

JO of the minimum cross section of the neck 10 of the interscapular channel 8 of the exhaust manifold 9 to the height 20 of the window 13 is 0.9-1.3, and the ratio of the cross section area of each gas outlet 3 of the water cavity 3 and 4 to the cross section area of the entrance window 13 is 1.2 1.3,

The collector works as follows.

2Q When opening the inlet window 13 of the exhaust pipe 9 of each of the cylinders 5 or 6, the exhaust gases through the interscapular channels 8 of the guide vanes 7 installed between

25 by walls 15 and 16, enter into the vapor compartments 3 and 4, placed in the cylindrical shell 1.

At the same time, the angles 17 and 18 of the inclination of the wall 15 and the partition 2. to the longitudinal plane 14 prevent the flow from separating and forming tear-off ZOI, and the shape of the bore section of the interscapular channels 8 of the exhaust pipes 9 creates favorable conditions for an unstressed flow inlet

 in the outlet collector, restructuring its structure when the flow direction changes and during flow on the linear sections of the collector. Completion of the ratio of the distance 19 from the entrance window 13 to the minimum cross section of the neck 10 to the height 20 of the window 13 equal to Og9-1j, 3 and the ratio of the area of the orifice section of each flue gas cavity 3 and 4 to the area of the through passage of the input window 13 equal to 1.2-1s35 as well as optimum angles 17 and 18, the hydraulic losses and the resistance of the high-altitude collector are minimized.

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Editor L. Gratilllo

Compiled by V. Kozlov Tehred T. Tulik

Order 975/38 Circulation 501. Subscription

VNIIBI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

Branch PPP Patent, Uzhgorod, st. Design, And

FIG. 2

Proofreader. Lugova

Claims (1)

EXHAUST COLLECTOR OF A TWO-STROKE INTERNAL COMBUSTION ENGINE, containing a cylindrical shell with a partition dividing it into two cavities for separate exhaust of gases from two groups of cylinders, connected through exhaust pipes to the corresponding group of cylinders, and installed in the exhaust pipes between two ducts between the vanes having necks with a minimum bore, and the Central axis of the shell and the entrance window of each exhaust pipe are located in longitudinal th cylinder plane, characterized in that, in order to reduce hydraulic resistance, the gas outlet cavities are made in the form of an oval, the partition is made as part of the oval, one of the walls of each exhaust pipe is made with smooth connection to the partition and the part of the wall adjacent to the cylinder is placed at an angle of 14 18 ° to the longitudinal plane of the cylinders, and the other wall is located so that each interscapular channel of the exhaust pipe is first tapering along the gas to a minimum neck section, and then expanding with a smooth connection to the gas outlet cavity, and the partition · g ka is located between the gas outlet cavities in the center of the shell and is located at an angle of 72-90 to the longitudinal plane of the cylinders, the ratio of the distance from the inlet window to the minimum section of the neck of the interscapular channel of the exhaust pipe to the window height is 0.9-1.3, and the ratio of the passage area of each gas outlet cavity to the area of the passage section of the input window is 1.2-1.3. SU <.. 1216386 ί 121