CN212318132U - Exhaust pipe of two-stroke diesel engine - Google Patents

Abstract

The utility model discloses a two-stroke diesel engine blast pipe, including the blast pipe body, the blast pipe body is including the blast pipe anterior segment, exhaust diffuser, expansion section, the exhaust convergence section and the tail pipe that connect gradually, and the blast pipe anterior segment is used for being connected with the engine gas vent, and waste gas flows through blast pipe anterior segment, exhaust diffuser, expansion section, exhaust convergence section and tail pipe in proper order, sets up exhaust cross section adjusting device in the expansion section, and exhaust cross section adjusting device has the waste gas passageway that lets waste gas pass through, and waste gas passageway's cross section size is adjustable. The utility model discloses a two-stroke diesel engine blast pipe, through set up exhaust cross section adjusting device in the inflation section, and then can influence pressure variation through the circulation cross section in the change blast pipe and reach the inflation efficiency that increases the stage of taking a breath, improve the performance of engine.

Description

Exhaust pipe of two-stroke diesel engine

Technical Field

The utility model belongs to the technical field of the engine, specifically speaking, the utility model relates to a two-stroke diesel engine blast pipe.

Background

For a two-stroke diesel engine, the timing and phasing of the intake and exhaust gases is achieved by the reciprocal movement of the piston and the height of the intake and exhaust scavenging ports, which also directly affect the engine performance. Under limited conditions, the design and the configuration of the exhaust port are difficult, fresh mixed gas entering the cylinder is easy to lose from the exhaust port, so that the charging efficiency of the engine is insufficient, the performance of the engine is reduced, and meanwhile, the charging of the air inlet and the air outlet, the movement direction of the air flow of the air outlet and the speed of the air flow of the air inlet are also influenced by the instantaneous pressure in the cylinder and the instantaneous pressure difference of the air inlet and the air outlet.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a two-stroke diesel engine blast pipe, the purpose promotes the engine performance.

In order to realize the purpose, the utility model discloses the technical scheme who takes does: two-stroke diesel engine blast pipe, including the blast pipe body, the blast pipe body is including the blast pipe anterior segment, exhaust diffuser, expansion segment, exhaust convergence section and the tail pipe that connect gradually, and the blast pipe anterior segment is used for being connected with the engine exhaust mouth, and waste gas flows through the blast pipe anterior segment in proper order, exhaust diffuser, expansion segment, exhaust convergence section and tail pipe, sets up exhaust cross section adjusting device in the expansion segment, and exhaust cross section adjusting device has the waste gas passageway that lets waste gas pass through, and waste gas passageway's cross section size is adjustable.

Exhaust cross section adjusting device including set up in fixed flabellum in the inflation section and rotatable set up in the rotatory flabellum of deciding flabellum one side, decide the flabellum and have the circulation hole that lets waste gas pass through, the circulation hole sets up a plurality ofly, and rotatory flabellum has the shielding plate that is used for sheltering from the circulation hole, and the shielding plate sets up a plurality ofly and each shielding plate corresponds a circulation hole respectively.

Decide the flabellum for discoid and decide the flabellum with the inflation section is coaxial setting, all circulation holes are for deciding the even distribution of flabellum upper edge circumference.

And the fixed fan blades are provided with adjusting motors for driving the rotating blades to rotate.

The exhaust diffusion section is a conical pipe body, the small-diameter end of the exhaust diffusion section is connected with the front section of the exhaust pipe, and the large-diameter end of the exhaust diffusion section is connected with the expansion section.

The exhaust convergence section is a conical pipe body, the small diameter end of the exhaust convergence section is connected with the tail end, and the large diameter end of the exhaust convergence section is connected with the expansion section.

The utility model discloses a two-stroke diesel engine blast pipe, through set up exhaust cross section adjusting device in the inflation section, and then can influence pressure variation through the circulation cross section in the change blast pipe and reach the inflation efficiency that increases the stage of taking a breath, improve the performance of engine.

Drawings

The description includes the following figures, the contents shown are respectively:

FIG. 1 is an exploded view of a two-stroke diesel engine exhaust pipe of the present invention;

FIG. 2 is a schematic structural view of an exhaust pipe body;

labeled as: 1. a front section of the exhaust pipe; 2. an exhaust diffuser section; 3. an expansion section; 4. an exhaust convergence section; 5. a tail pipe; 6. adjusting the motor; 7. fixing fan blades; 8. rotating the fan blades; 9. and (4) a flow hole.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings, for the purpose of helping those skilled in the art to understand more completely, accurately and deeply the conception and technical solution of the present invention, and to facilitate its implementation.

As shown in fig. 1 and 2, the present invention provides a two-stroke diesel engine exhaust pipe, including an exhaust pipe body and an exhaust cross section adjusting device. The blast pipe body is including the blast pipe anterior segment 1 that connects gradually, exhaust diffusion section 2, expansion segment 3, exhaust convergence section 4 and tail pipe 5, blast pipe anterior segment 1 is used for being connected with the engine gas vent, waste gas flows through blast pipe anterior segment 1 in proper order, exhaust diffusion section 2, expansion segment 3, exhaust convergence section 4 and tail pipe 5, set up exhaust cross section adjusting device in the expansion segment 3, exhaust cross section adjusting device has the waste gas passageway that lets waste gas pass through, the cross section size of waste gas passageway is adjustable.

Specifically, as shown in fig. 1 and 2, the exhaust cross section adjusting device includes a fixed blade 7 disposed in the expansion section 3 and a rotating blade 8 rotatably disposed on one side of the fixed blade 7, the fixed blade 7 has a flow hole 9 through which the exhaust gas passes, the flow hole 9 is a through hole penetrating in a thickness direction of the fixed blade 7, the flow hole 9 is provided in plural, the rotating blade 8 has a shielding plate for shielding the flow hole 9, the shielding plate is provided in plural, the number of the shielding plate is the same as that of the flow hole 9, and each shielding plate corresponds to one flow hole 9. The expansion section 3 is a hollow cylinder, the inner cavity of the expansion section 3 is a circular cavity, the fixed fan blade 7 is disc-shaped, the fixed fan blade 7 and the expansion section 3 are coaxially arranged, the fixed fan blade 7 is fixedly connected with the expansion section 3, and all the circulation holes 9 are uniformly distributed on the fixed fan blade 7 along the circumferential direction by taking the axis of the fixed fan blade 7 as the central line. Rotating fan blade 8 is located between fixed flabellum 7 and exhaust diffuser 2, and rotating fan blade 8 and fixed flabellum 7 laminating decide flabellum 7 and be coaxial setting with rotating fan blade 8, and all shielding plates are along circumference evenly distributed with rotating fan blade 8's axis as the central line.

As shown in fig. 1 and 2, an adjusting motor 6 (model number of the motor is WS37GB3525) for driving the rotating blades to rotate is disposed on the fixed blades 7, a motor shaft of the adjusting motor 6 is fixedly connected with the rotating blades 8, and the adjusting motor 6 is mounted on the fixed blades 7. The circulation hole 9 is a fan-shaped hole, the circulation hole 9 forms an exhaust gas channel, and the exhaust gas entering the expansion section 3 flows to the exhaust convergence section 4 after passing through the circulation hole 9. The shielding plate is attached to the fixed fan blade 7, the adjusting motor 6 drives the rotating fan blade 8 to rotate, the change of the contact ratio of the shielding plate and the circulation hole 9 can be achieved, the opening size of the circulation hole 9 can be changed, the effective circulation area of the circulation hole 9 can be controlled, and the sectional area of the waste gas channel can be controlled.

As shown in fig. 1 and 2, in the present embodiment, four flow holes 9 are provided, and correspondingly, four shielding plates are provided.

As shown in fig. 1 and 2, the exhaust diffuser 2 is a conical pipe, the small diameter end of the exhaust diffuser 2 is connected to the exhaust pipe front section 1, and the large diameter end of the exhaust diffuser 2 is connected to the expansion section 3. The big footpath end of exhaust diffuser 2 holds and the relative both ends of footpath end for the axial of exhaust diffuser 2, the interior cavity of exhaust diffuser 2 is conical cavity, blast pipe anterior segment 1 is inside hollow cylinder, the interior cavity of blast pipe anterior segment 1 is circular cavity, the one end of blast pipe anterior segment 1 is connected with the gas vent of engine, the other end of blast pipe anterior segment 1 and the path end fixed connection of exhaust diffuser 2, the diameter of blast pipe anterior segment 1 is the same with the diameter size of the path end of exhaust diffuser 2, the diameter of the big footpath end of exhaust diffuser 2 is the same with the diameter size of expansion segment 3.

As shown in fig. 1 and 2, the exhaust convergence section 4 is a conical tube, the small diameter end of the exhaust convergence section 4 is connected to the tail end, and the large diameter end of the exhaust convergence section 4 is connected to the expansion section 3. The large-diameter end and the small-diameter end of the exhaust convergence section 4 are opposite ends of the exhaust convergence section 4 in the axial direction, the inner cavity of the exhaust convergence section 4 is a conical cavity, the tail pipe 5 is a cylinder with a hollow inner part, the inner cavity of the tail pipe 5 is a circular cavity, one end of the tail pipe 5 is communicated with the atmosphere, the other end of the tail pipe 5 is fixedly connected with the small-diameter end of the exhaust convergence section 4, the diameter of the tail pipe 5 is the same as that of the small-diameter end of the exhaust convergence section 4, and the diameter of the large-diameter end of the exhaust convergence section 4 is the same as that of the expansion section 3.

When the engine works and operates, in the descending process of the piston, the exhaust port is opened firstly, and because of huge pressure difference formed between the crankcase and the exhaust pipe, waste gas can rush out from the exhaust port, and the exhaust pipe front section 1 passes through the exhaust diffusion section 2 and then enters the expansion section 3, and the exhaust section adjusting device is arranged in the expansion section 3, so that the purpose of changing the exhaust section is achieved by changing the rotating angle of the rotating fan blades 8 according to the real-time phase and different rotating speeds of the engine. The exhaust gas enters the rear half of the expansion section 3 through the fan blades and then moves towards the exhaust convergence section 4 behind the expansion chamber. The exhaust gas is discharged through the exhaust converging section 4 into the tail pipe 5.

When the exhaust port is opened and the scavenging port is not opened, the engine is in a free exhaust stage, the exhaust gas in the cylinder needs to be rapidly exhausted at the moment, the rotating fan blades 8 are rotated for a certain angle, when the shapes of the two fan blades are consistent, namely the circulation hole 9 is not shielded, the circulation hole 9 is in a maximum opening state, the exhaust flow can reach the maximum, and the pressure in the exhaust pipe is gradually reduced along with the continuous exhaust of the exhaust gas; when the scavenging port is opened, the engine is in the forced scavenging stage, from opening to this process of closing at the air inlet, the gas vent is in the open mode always, fresh air gets into the cylinder fast this moment, mix with remaining waste gas, the pressure differential has been formed between the jar and the blast pipe, fresh gas and gas mixture can have the cylinder to discharge to the blast pipe fast, let rotatory flabellum 8 continue to rotate certain angle this moment, can adjust the rotation angle of rotatory flabellum 8 according to the phase place and the real-time rotational speed of engine, along with the exhaust flow reduces gradually, the pressure of flabellum department can rise gradually, and formed the pressure differential again between the gas vent, can with some gas back-thrusting of exhaust in the cylinder, can avoid appearing the direct exhaust phenomenon of fresh gas short circuit. The piston continues to move upwards, the air inlet is closed, only the air outlet is reserved, at the moment, the fan blades are required to rotate to the position with the minimum section, and the pressure in the whole pipe is guaranteed to be higher than the air outlet as much as possible. After the exhaust port is also closed, the rotation angle of the fan blade needs to be continuously adjusted to the maximum section, so that the residual gas can be rapidly exhausted and preparation is also made for the next circulation.

The invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-described manner. Various insubstantial improvements are made by adopting the method conception and the technical proposal of the utility model; or without improvement, the above conception and technical solution of the present invention can be directly applied to other occasions, all within the protection scope of the present invention.

Claims (6)

1. Two-stroke diesel engine exhaust pipe, including the blast pipe body, its characterized in that: the exhaust pipe body comprises an exhaust pipe front section, an exhaust diffusion section, an expansion section, an exhaust convergence section and a tail pipe which are connected in sequence, wherein the exhaust pipe front section is used for being connected with an engine exhaust port, waste gas flows through the exhaust pipe front section, the exhaust diffusion section, the expansion section, the exhaust convergence section and the tail pipe in sequence, an exhaust section adjusting device is arranged in the expansion section, the exhaust section adjusting device is provided with a waste gas channel through which the waste gas passes, and the section size of the waste gas channel is adjustable.

2. The exhaust pipe for a two-stroke diesel engine according to claim 1, characterized in that: exhaust cross section adjusting device including set up in fixed flabellum in the inflation section and rotatable set up in the rotatory flabellum of deciding flabellum one side, decide the flabellum and have the circulation hole that lets waste gas pass through, the circulation hole sets up a plurality ofly, and rotatory flabellum has the shielding plate that is used for sheltering from the circulation hole, and the shielding plate sets up a plurality ofly and each shielding plate corresponds a circulation hole respectively.

3. The exhaust pipe for a two-stroke diesel engine according to claim 2, characterized in that: decide the flabellum for discoid and decide the flabellum with the inflation section is coaxial setting, all circulation holes are for deciding the even distribution of flabellum upper edge circumference.

4. The exhaust pipe for a two-stroke diesel engine according to claim 2, characterized in that: and the fixed fan blades are provided with adjusting motors for driving the rotating fan blades to rotate.

5. The exhaust pipe for a two-stroke diesel engine according to any of claims 1 to 4, characterized in that: the exhaust diffusion section is a conical pipe body, the small-diameter end of the exhaust diffusion section is connected with the front section of the exhaust pipe, and the large-diameter end of the exhaust diffusion section is connected with the expansion section.

6. The exhaust pipe for a two-stroke diesel engine according to any of claims 1 to 4, characterized in that: the exhaust convergence section is a conical pipe body, the small-diameter end of the exhaust convergence section is connected with the tail end, and the large-diameter end of the exhaust convergence section is connected with the expansion section.

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