CN101688461B - Apparatus for removing exhaust gas pressure and preventing backflow of exhaust gas - Google Patents

Abstract

This invention discloses a device for eliminating exhaust pressure and preventing exhaust backflow. The device according to the invention includes: a fixed pipe (100) mounted on the end of an exhaust pipe of an internal combustion engine and having a plurality of backflow gas guide holes (102) adjacent to the exhaust pipe; and a second exhaust pipe (110) surrounding the fixed pipe. In this device, a backflow channel (120) is formed between the fixed pipe and the second exhaust pipe, allowing a portion of the exhaust gas discharged through the fixed pipe to flow into the backflow channel. The backflow gas is then guided into the fixed pipe through the backflow gas guide holes and discharged back to the outside. Thus, this invention prevents backflow gas from being drawn into the exhaust pipe, thereby improving the performance of the internal combustion engine.

Description

A device for eliminating exhaust pressure and preventing exhaust backflow

technical field

The present invention generally relates to a device for eliminating exhaust gas pressure and preventing exhaust backflow (exhaust pulse), especially such a device for eliminating exhaust pressure and preventing exhaust backflow, including: a fixed pipe (mounting pipe), mounted at the rear end of the exhaust pipe extending from the internal combustion engine or the rear end of the boiler flue, and having a plurality of backflow gas guide holes formed in a line along the outer peripheral surface; and Two exhaust pipes are arranged around the fixed pipe, so that a return channel is defined between the fixed pipe and the second exhaust pipe and opens from the above-mentioned return gas guide hole to the exhaust gas discharge direction.

Therefore, the return gas (exhaust pulse) flowing back from the exhaust gas discharged through the fixed pipe can be guided to the return passage formed between the second exhaust pipe and the fixed pipe, and the guided return gas is guided by the return gas The guide hole is moved to the inside of the fixed pipe, and then discharged to the outside together with the exhaust gas which is then discharged, thereby preventing the return gas from flowing back into the exhaust pipe.

As mentioned above, in the case of preventing the return gas from flowing back into the exhaust pipe, the performance of the internal combustion engine can be improved, thereby improving mileage and fuel consumption and reducing smoke exhaust, thereby maximizing thermal energy efficiency, and, by forcibly fixing to the exhaust The tube ends are easily installed for the convenience of the user.

Background technique

Generally speaking, for internal combustion engines, the exhaust gas of pollutants generated due to combustion in the internal combustion engine is discharged at a relatively high pressure of about 3 to 5kg/ ^cm2 and a relatively high temperature of about 600°C, so it is necessary to install a catalytic device and silencer device.

In the internal combustion engine, when the exhaust gas is discharged from the internal combustion engine, a vacuum is formed in the exhaust manifold, thereby forming the first exhaust resistance that hinders the exhaust gas from being discharged. Subsequently, when this exhaust gas passes through the purifier, its flow rate is significantly reduced, thereby forming a second exhaust resistance.

Thereafter, when the exhaust gas flowing into the muffler passes through the partitions formed in stages, a third exhaust resistance will be formed.

During such exhaust gas discharge, the muffler is usually designed to have a volume that is 15 to 20 times larger than the engine displacement, so exhaust resistance is inevitably generated. As a result, the output of the engine is lowered, and the fuel consumption is increased by about 5 to 10% and the amount of pollutants is increased.

Therefore, it should be recognized that the efficiency of combustion, thereby improving mileage, output power, and heat, can be improved simply by smooth exhaust exhaust. In order to achieve the above objects, various conventional technical solutions have been proposed.

In the case of a boiler, if the flue encounters an upwind, the wind will penetrate into the combustion chamber due to the reverse flow of external air, resulting in incomplete combustion, and the steam and floating nitrogen-containing compounds generated during combustion will be adsorbed on the heat exchanger. On the surface.

In the case where the above phenomenon is repeated, the performance of the boiler heat exchanger will be reduced, resulting in a decrease in the heat exchange function. Therefore, many studies aimed at improving the above problems have also been conducted.

Meanwhile, as an illustrative example of a conventional technical solution, a vehicle exhaust device using air flow is proposed in Korean Patent Publication No. 2000-56951. This technical solution utilizes air flow, which is designed to combine the streamlined body of the exhaust with the exhaust pipe, so that when the vehicle is moving, a low pressure is created around the exhaust according to the velocity of air flowing over the surface of the streamlined body area, so that the exhaust gas is sucked away by the above-mentioned low pressure, thereby assisting the discharge of the exhaust gas.

However, the disadvantage of the above technical solution is that the structure of the streamlined main body is relatively large and complicated, so it is not easy to install it on the vehicle, and it is difficult to use this technical solution in practice.

Meanwhile, as another example of a conventional technical solution, a main muffler exhaust pipe with a vortex generator is proposed in Korean Patent Publication No. 1998-75223, and a vortex that can be rotated by exhaust gas is set in the middle of the exhaust pipe. produce leaves. This technical solution is configured to use the exhaust gas to rotate the blades, thereby generating a vortex, thereby promoting exhaust gas discharge. However, there are problems in that the vane becomes the source of some resistance against the flow of exhaust gas, and its structure is highly susceptible to thermal deformation, so it is difficult to utilize it in practice.

As another example of a conventional technical solution, Korean Patent Publication No. 257874 proposes an exhaust gas discharge device using vortex flow, and a pipeline that can suck external air is separately provided at the front end of the muffler disposed on the exhaust gas discharge path. In addition, a vane that can suck in external air and generate a vortex is installed in the above-mentioned piping. In addition, the device also has a damper for adjusting the amount of outside air taken in, which works in proportion to the opening degree of the throttle valve.

However, in this technical proposal, since a sub-pipe that communicates with the outside air is provided at the front end of the muffler that provides vortex flow to the exhaust gas removal path and eliminates exhaust noise, the exhaust noise is transmitted to the outside through this sub-pipe, causing a lot of noise. loud noise. Furthermore, since the outside air damper is installed in conjunction with the throttle valve of the engine, there is a disadvantage in that the structure and structure of the equipment become complicated.

As another example of a conventional technical solution, Korean Utility Model Application No. 20-0010194 proposes an exhaust gas discharge device for a vehicle in which an air inflow hole is formed, and a thread rolling board and a steel plate are formed around the air inflow hole so that when When the vehicle is running, the generated airflow is used to form a vortex.

However, the above-mentioned device is configured to form a vortex through the steel plate and the thread rolling plate in the flared tube, so the exhaust gas must pass through a relatively narrow path. Therefore, this device has problems in that the structure is unstable, exhaust resistance and backflow gas are generated, and aerodynamic noise is generated around the rear end of the muffler.

The above technical solution recognizes that the flow rate of the exhaust gas is increased, thereby increasing the output of the engine and reducing fuel consumption. However, their drawback is that they have little effect when the vehicle is stopped or traveling at low speeds, and when the vehicle is traveling at high speeds, they produce aerodynamic noise at the rear end of the muffler.

Contents of the invention

Therefore, the present invention is committed to overcoming the deficiencies of the prior art, and an object of the present invention is to provide a device for eliminating exhaust pressure and preventing exhaust backflow, comprising: a fixed pipe installed on the exhaust pipe extending from the internal combustion engine The rear end or the rear end of the boiler flue, and has a plurality of return gas guide holes at predetermined positions in a line along its peripheral surface; and the second exhaust pipe is arranged around the fixed pipe, so that the fixed pipe and the A recirculation channel opened from the recirculation gas guide hole to the exhaust gas discharge direction is defined between the second exhaust pipes.

Therefore, the return gas (exhaust pulse) flowing back from the exhaust gas discharged through the fixed pipe can be guided to the return passage formed between the second exhaust pipe and the fixed pipe, and the guided return gas is guided by the return gas The guide hole is moved to the inside of the fixed pipe, and then discharged to the outside together with the exhaust gas which is then discharged, thereby preventing the return gas from flowing back into the exhaust pipe.

As mentioned above, in the case of preventing the return gas from flowing back into the exhaust pipe, the performance of the internal combustion engine can be improved, thereby improving mileage and fuel consumption and reducing smoke exhaust, thereby maximizing thermal energy efficiency, and, by forcibly fixing to the exhaust The tube rear end is easy to install, which brings convenience to the user.

In order to achieve the above object, the present invention provides a device for eliminating exhaust pressure and preventing exhaust backflow, including: a fixed pipe, which has a structure that can be installed at the end of an exhaust pipe extending from an internal combustion engine or at the end of a boiler flue, and fixed The portion of the pipe that is not fixed to the end of the exhaust pipe protrudes outward beyond the rear end of the exhaust pipe, and the fixed pipe is hollow so that its interior communicates with the exhaust pipe, at a position adjacent to the end of the above-mentioned exhaust pipe. A plurality of return gas guide holes are formed in the fixed pipe along a line around its circumference; and a second exhaust pipe is arranged to have a shape surrounding the fixed pipe, wherein, between the above-mentioned fixed pipe and the above-mentioned second exhaust pipe The return channel is formed so that the return part of the exhaust gas discharged through the fixed pipe flows into the return channel, and the return gas is guided to the inside of the fixed pipe through the return gas guide hole, and the guided return gas is discharged to the outside again.

Preferably, the ends of the fixed pipe and the second exhaust pipe that are not fixed to the exhaust pipe are bent toward the longitudinal center direction, and the cross-sectional area of the space defined by the curved end of the second exhaust pipe is larger than that of the above-mentioned fixed pipe. The cross-sectional area of the space bounded by the curved ends.

The device may further include an internal flue provided at an end of the above-mentioned fixed pipe that is not fixed to the exhaust pipe, and the internal flue has a honeycomb structure.

In addition, the device also includes a gas guide blade unit, which is arranged inside the above-mentioned fixed pipe, so as to reduce the conflict between the backflow gas and the exhaust gas from the backflow gas guide hole, and increase the exhaust gas discharge speed, thereby quickly and smoothly exhaust exhaust.

In addition, the above gas guide vane unit includes: a plurality of vanes provided on the inner surface of the fixed pipe, each of the plurality of vanes is arranged between adjacent return gas guide holes; and a conical vane support body , located at the central part of the fixed tube where the plurality of blades meet.

In addition, each of the plurality of blades described above is bent so as to be inclined at a predetermined angle with respect to the exhaust gas discharge direction.

The device may also include a blade flue arranged at the end of the fixed pipe that is not fixed to the exhaust pipe, and the blade flue has a honeycomb structure.

In addition, the device may further include a gas guide vane unit, one end of which is inserted between the above-mentioned fixed pipe and the exhaust pipe, the gas guide vane unit having a longitudinal section curved toward its longitudinal center axis, whereby the gas guide vane unit The cross-sectional area of the defined space is reduced along the exhaust gas discharge direction, thereby increasing the flow velocity of the exhaust gas, and the gas guide vane unit forms a second channel between the gas guide vane unit and the inner peripheral surface of the fast fixed pipe, which communicates with the return gas guide hole. Two backflow channels.

In addition, the device may include a blade flue provided inside the rear end of the gas guide blade unit in the exhaust gas discharge direction, and the blade flue has a honeycomb structure.

In addition, the device may further include a third exhaust pipe disposed around the second exhaust pipe, and a locking hole is formed in one end of the third exhaust pipe adjacent to the end of the above-mentioned exhaust pipe to insert a locking bolt, Thus, the second exhaust pipe is more firmly fixed to the exhaust pipe through the third exhaust pipe.

Description of drawings

1 is a view showing a device for eliminating exhaust pressure and preventing exhaust backflow according to the present invention;

Fig. 2 is a partial sectional view along A-A' line of Fig. 1;

Fig. 3 is a side sectional view of the device for preventing exhaust backflow according to the present invention;

FIG. 4 is a view showing the exhaust gas flow of the exhaust gas backflow preventing device according to the present invention;

5 is a view showing another embodiment of the device for preventing backflow of exhaust gas according to the present invention;

6 is a view showing an exhaust gas backflow preventing device according to a modification of an embodiment of the present invention, which is provided with an internal flue;

7 is a view showing an exhaust gas backflow preventing device according to another embodiment of the present invention, which is provided with a fixed blade;

FIG. 8 is a view showing another embodiment of a stationary vane of an exhaust backflow preventing device according to the present invention;

Fig. 9 is a view showing a modification of Fig. 7, wherein blade flues are also provided;

10 is a view showing still another embodiment of the fixed vane of the exhaust gas backflow preventing device according to the present invention;

Fig. 11 is a view showing a modification of Fig. 10, in which blade flues are also provided; and

FIG. 12 is a view showing an exhaust backflow preventing device according to another embodiment of the present invention, which is provided with a third exhaust pipe.

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Although preferred embodiments of the present invention have been disclosed for illustrative purposes, these embodiments do not limit the scope of the present invention, and those skilled in the art should understand that, without departing from the technical scope and spirit of the present invention Various modifications, additions and substitutions are possible under certain conditions.

FIG. 1 is a view showing an apparatus for eliminating exhaust pressure and preventing backflow of exhaust gas according to the present invention. Fig. 2 is a partial sectional view along line A-A' of Fig. 1 . Fig. 3 is a side sectional view of the device for preventing backflow of exhaust gas according to the present invention. FIG. 4 is a view showing the exhaust gas flow of the exhaust gas backflow prevention device according to the present invention. FIG. 5 is a view showing another embodiment of the exhaust backflow preventing device according to the present invention. FIG. 6 is a view showing an exhaust gas backflow preventing device according to a modification of the embodiment of the present invention, which is provided including an internal flue. FIG. 7 is a view showing an exhaust backflow preventing device according to another embodiment of the present invention, which is provided with a fixed vane. FIG. 8 is a view showing another embodiment of the stationary vane of the exhaust backflow preventing device according to the present invention. Fig. 9 is a view showing a modification of Fig. 7 in which blade flues are also provided. FIG. 10 is a view showing still another embodiment of the fixed vane of the exhaust backflow preventing device according to the present invention. Fig. 11 is a view showing a modification of Fig. 10 in which blade flues are also provided. FIG. 12 is a view showing an exhaust backflow preventing device according to another embodiment of the present invention, which is provided with a third exhaust pipe.

As shown in the figure, the device 10 for eliminating exhaust pressure and preventing exhaust backflow according to the present invention includes a fixed pipe 100 and a second exhaust pipe 110 , which are in the shape of concentric circles with different diameters.

The fixed pipe 100 is combined on the outer surface of the rear end of the exhaust pipe 1 extending from the boiler or internal combustion engine. Also, a plurality of return gas guide holes 102 are formed along the circumference of the outer peripheral surface of the fixed pipe 100 at positions adjacent to the rear end of the exhaust pipe 1 .

A second exhaust pipe 110 is sheathed on the outside of the fixed pipe 100 , which forms a shape surrounding the fixed pipe 100 . Therefore, the second exhaust pipe 110 surrounds the fixed pipe 100 and forms a return channel 120 with one end open between the second exhaust pipe 110 and the fixed pipe 100 .

In other words, the fixed pipe 100 and the second exhaust pipe 110 are connected to each other at their front ends, and the return passage 120 is formed therebetween, which extends from the middle portion of the fixed pipe 100 and the second exhaust pipe 110 toward them. The backend is open. That is, the return passage 120 is formed between the fixed pipe 100 and the second exhaust pipe 110 so as to open from the return gas guide hole 102 to the exhaust gas discharge direction.

Usually, in the case of boilers or internal combustion engines, due to their structural characteristics, a backflow phenomenon occurs in which a gas backflow occurs at the rear end of the exhaust pipe 1 so that part of the exhaust gas flows back into the exhaust pipe 1 . However, in the present invention, the return gas enters the return passage 120 instead of entering the exhaust pipe 1 due to the above structure.

In other words, when the exhaust gas discharged from the exhaust pipe 1 passes through the fixed pipe 100 communicating with the exhaust pipe 1 , the backflow gas affected by the back pressure will be sucked into the backflow channel 120 to prevent the backflow gas from flowing back into the fixed pipe 100 .

In addition, the backflow gas drawn into the backflow channel 120 moves into the fixed pipe 100 through the backflow gas guide hole 102 formed in the fixed pipe 100 , and the backflow gas is discharged out of the fixed pipe 100 together with the subsequently discharged exhaust gas.

At this time, the fixed pipe 100 has a funnel shape whose longitudinal section is inclined toward the longitudinal central axis from the front end of the fixed pipe 100 combined with the rear end of the exhaust pipe 1 to the rear end of the fixed pipe 100, so that the Exhaust gas discharge speed. Moreover, due to the shape of the fixed pipe 100 , by changing the offset distance between the fixed pipe 100 and the second exhaust pipe 110 , the cross-sectional areas of the two ends of the return channel 120 are different.

As mentioned above, since the cross-sectional area of the return channel 120 increases from its front end communicating with the return gas guide hole 102 to its rear end, the speed of the return gas flowing into the end of the return channel 120 is increased, thereby facilitating the guiding of the return gas to flow into the return flow. channel, and make it easy to suck the fixed pipe through the return air guide hole 102.

As shown in FIG. 5 , the fixed pipe 100 and the second exhaust pipe 110 are configured such that their unfixed ends (rear ends) are bent toward the center axis direction. In this case, around the bent ends of the fixed pipe 100 and the second exhaust pipe 110, the discharge speed of the exhaust gas is further increased to facilitate the discharge of the exhaust gas.

In other words, the ends of the fixed pipe 100 and the second exhaust pipe 110 that are opposite to the rear end of the exhaust pipe 1 and that allow exhaust gas to be discharged are bent inward, so that the exhaust gas that is fastened to the front end of the fixed pipe 100 of the exhaust pipe 1 Velocity is greater than the exhaust velocity of its rear end, making it easier for the exhaust to escape.

In addition, in the case where the rear end of the fixed pipe 100 is bent toward its longitudinal central axis, it is possible to more effectively prevent the return gas from flowing back through the rear end of the fixed pipe 100 .

At this time, the cross-sectional area of the space defined by the rear end of the second exhaust pipe 110 is larger than the cross-sectional area of the space defined by the rear end of the fixed pipe 100 , thus forming the inlet of the return passage 120 . And the return channel 120 is used together with the second exhaust pipe 110 having a bent end to reduce the amount of return gas.

In addition, an internal flue 130 is provided at the rear end of the fixed pipe 100 . The inner flue 130 has a honeycomb structure to prevent undesired diffusion of exhaust gas from the rear end edge of the fixed pipe 100 so that the exhaust gas can be discharged to the outside more quickly and smoothly.

As shown in FIGS. 7 to 9 , by providing the gas guide vane unit 140 in the fixed pipe 100 , the exhaust gas can be discharged more smoothly through the exhaust pipe 1 . In addition, the backflow gas flowing in through the backflow gas guide hole 102 is efficiently discharged through the smooth discharge of the exhaust gas.

The gas guide vane unit 140 includes a vane support body and a plurality of vanes. The vanes are disposed inside the fixed pipe 100 , and each vane is arranged between adjacent return gas guide holes 102 . The blade supporting body has a conical shape and is arranged at the center of the fixed pipe where the plurality of blades are in contact.

In the embodiment of the present invention, although the blade supporting body is shown as a conical shape, the blade supporting body can also adopt other shapes, as long as the exhaust gas can be quickly and smoothly discharged through the fixed pipe 100 .

In addition, as shown in FIG. 8 , as another embodiment of the gas guide vane unit 140 ′, the gas guide vane unit has a structure in which each vane is inclined to a certain degree relative to the discharge direction and bent to form a Exhaust gas quickly. In this case, the exhaust gas can be discharged more quickly, so that the return gas passing through the return gas guide hole 102 can be discharged more efficiently.

In addition, a blade flue 150 with a honeycomb structure may be provided at the unfixed end (rear end) of the fixed pipe 100, so that exhaust gas can be discharged more easily. Thus, the backflow gas flowing into the fixed pipe 100 through the backflow gas guide hole 102 can be effectively discharged by smoothly discharging the exhaust gas.

In addition, as shown in FIGS. 10 to 11 , a gas guide vane unit 140 ″ is provided in the fixed pipe 100 and inserted between the exhaust pipe 1 and the fixed pipe 100 .

The gas guide vane unit 140" has a shape whose longitudinal cross-section is bent toward its longitudinal center axis, so that the cross-sectional area of the space defined by it becomes smaller toward the exhaust gas discharge direction from its front end to its rear end. A second return passage 160" is formed between the fixed pipe 100 and the gas guide vane unit 140".

Likewise, in the case where the rear end of the gas guide vane unit 140'' is inclined toward its longitudinal center axis, exhaust gas discharge becomes easier due to the increased discharge velocity of the exhaust gas passing through the exhaust pipe 1.

The function of the second return channel 160 ″ is to prevent the return gas flowing into the return channel 120 from flowing back into the exhaust pipe 1 after passing through the return gas guide hole 102 , so that the return gas can be discharged to the outside more reliably and effectively.

In addition, preferably, a honeycomb-structured blade flue 150″ is provided at the rear end of the gas guide blade unit 140″, so that the exhaust gas can be discharged more effectively, and by smoothly discharging the exhaust gas, it can be effectively discharged through the return gas guide hole. 102 Incoming return gas.

In addition, the present invention may have a structure in which the third exhaust pipe 170 is provided around the second exhaust pipe 110 . In this case, both ends of the third exhaust pipe 170 are disposed outside of both ends of the second exhaust pipe 110 such that the third exhaust pipe 170 completely shields the second exhaust pipe 110 .

In addition, at one end of the third exhaust pipe 170 adjacent to the exhaust pipe 1, a locking hole is formed to insert a locking bolt B. As shown in FIG. The locking bolt B is rotatably inserted into the locking hole 172 to press a portion of the outer surface of the exhaust pipe 1 .

In this way, the third exhaust pipe 170 and the second exhaust pipe 110 are fixed, and the lock bolt B is pressed in opposite directions on a part of the outer surface of the exhaust pipe 1 . Thus, the third exhaust pipe 170 is firmly fixed to the exhaust pipe 1 .

In addition, in this embodiment, since the third exhaust pipe 170 is provided in a shape surrounding the fixed pipe 100 and the second exhaust pipe 110, the fixed pipe 100 and the second exhaust pipe 110 are protected by the third exhaust pipe 170. , and keep the appearance of the device beautiful to meet the needs of consumers.

Industrial Applicability

As described above, the present invention provides a device for relieving the exhaust pressure and preventing the backflow of the exhaust gas, which is configured to guide the backflow part of the exhaust gas to the backflow formed between the second exhaust pipe and the fixed pipe. In the channel, the guided return gas is sucked into the interior of the fixed pipe through the return gas guide hole, and is discharged to the outside together with the subsequently discharged exhaust gas, thereby preventing the return gas from flowing back into the exhaust pipe.

Where exhaust pressure is eliminated by preventing the influx of backflow gases, internal combustion engine performance is improved, resulting in improved mileage and reduced smoke emissions, thereby maximizing thermal efficiency. Moreover, the device of the present invention can be easily installed only by being forcibly fixed on the exhaust pipe, which brings convenience to users. As such, the invention described is effective and practical.

Claims (5)

1. device of eliminating exhaust pressure and preventing exhaust gas recirculation comprises:

Fixed tube, have and be installed on from outlet pipe end that internal-combustion engine extends or the structure of the flue end of boiler, the end is outwards outstanding thereby the part except the part that is fixed to the outlet pipe end of described fixed tube exceeds outlet pipe, described fixed tube is hollow, thereby it is inner is communicated with outlet pipe, and the edge is formed with a plurality of reflux gas guide holes around a line of its circumference in the position that is close to described outlet pipe end is in fixed tube; And

Second exhaust pipe is set to have the shape around fixed tube, wherein,

Be limited with the return flow line between described fixed tube and described second exhaust pipe, so that the backflow from the waste gas that fixed tube is discharged partly flows in described return flow line, and be directed in fixed tube by the reflux gas guide hole, and the reflux gas that is guided is expelled to the outside again

Wherein, not described fixed tube and second exhaust pipe not crooked towards longitudinal center's axis direction with outlet pipe fixing each end, and the section area in the space that the section area in the space that the curved end of second exhaust pipe defines defines greater than the curved end of described fixed tube

Described device also comprises:

Fixed tube be not provided with inner flue with outlet pipe fixing end, described inner flue has cellular structure.

2. elimination exhaust pressure according to claim 1 and prevent the device of exhaust gas recirculation also comprises:

Gas guide blade unit is arranged in described fixed tube, in order to reduce conflicting between the reflux gas of discharging from the reflux gas guide hole and waste gas, and improves the velocity of discharge of waste gas, thus combustion gas successfully rapidly.

3. elimination exhaust pressure according to claim 2 and prevent the device of exhaust gas recirculation,

Wherein, described gas guide blade unit comprises:

A plurality of blades are arranged on the internal surface of described fixed tube, and each in described a plurality of blades is arranged between adjacent reflux gas guide hole; And

Conical blade supportive body is positioned at the central part that above-mentioned a plurality of blade engages the described fixed tube at place.

4. elimination exhaust pressure according to claim 3 and prevent the device of exhaust gas recirculation, wherein, each in described a plurality of blades is all crooked, tilts at a predetermined angle in order to discharge direction with respect to waste gas.

5. elimination exhaust pressure according to claim 1 and prevent the device of exhaust gas recirculation also comprises:

The 3rd outlet pipe, arrange around described second exhaust pipe, be formed with locking aperture in an end of described the 3rd outlet pipe adjacent with described outlet pipe end, inserting lock(ing) bolt, thereby by the 3rd outlet pipe, second exhaust pipe be firmly fixed at outlet pipe.

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