JP2009542948A - Automotive exhaust - Google Patents

Abstract

Automotive exhaust is described. The exhaust device of the present invention includes, as an extension tube, an extension tube 10 that forms a venturi conduit for increasing the flow velocity at the exhaust inflow end. The venturi line 20 is formed at the exhaust inflow end of the extension pipe for increasing the flow rate of the exhaust gas. The exhaust device has an outside air discharge nozzle 30 extending and projecting inside the venturi conduit, a reverse flow inlet 40 for inducing outside air at the exhaust discharge end of the tube, and the reverse flow inlet and the external air discharge nozzle communicate with each other. A cover 50 is further included to limit the chamber to. Therefore, the present invention uses the flow of outside air to reduce the backflow of exhaust gas and prevent back pressure. Also, the exhaust gas is washed and exhausted to increase engine output.
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Description

  The present invention relates to an exhaust device for exhausting combustion gas used in an internal combustion engine. More specifically, the present invention relates to an exhaust device for suppressing exhaust gas backflow by using an air flow in a tail pipe of a silencer provided in an exhaust gas exhaust path of an automobile. The present invention relates to an exhaust device for an automobile that is useful for improving fuel efficiency and output by reducing exhaust pressure and exhausting gas quickly.

  As is well known, in an automobile using an internal combustion engine, power is obtained by four strokes of suction, compression, explosion, and exhaust.

  The flow of air (intake and exhaust) in the stroke of the engine will be described. When the air passes through the air cleaner, the throttle valve, etc., the inflow is performed without a relatively large resistance.

  However, in the exhaust process, exhaust gas is exhausted to the tail pipe through an exhaust manifold, an air purification device using a catalyst, a silencer, and the like, thereby generating a considerable resistance to the exhaust flow.

  In the process of discharging from the engine cylinder to the silencer tail pipe, the exhaust manifold has a timing when a so-called valve overlap occurs, in which the intake valve and the exhaust valve are instantaneously opened simultaneously during the four strokes of the engine. There is a phenomenon that the gas discharged in this process flows into the cylinder again, and a vacuum state is instantaneously formed in the exhaust manifold, thereby forming a primary back pressure that prevents the exhaust gas from being discharged. Is done.

  Further, in the three-dimensional catalyst device that is an air purifier, the exhaust gas flow rate is remarkably reduced through the fine ventilation holes of the honeycomb-shaped exhaust gas purifier, and a secondary back pressure is formed. If it flows in, the third back pressure is formed when sound is absorbed around the multi-partitioned partitions.

In such an exhaust process, the exhaust gas is exhausted at a pressure of ^{3 to 5} kg / cm ³ and a temperature of about 600 ° C., and a silencer is absolutely necessary. The silencer has a volume approximately 15 to 20 times the displacement Designed, such a silencer has a problem that the combustion gas of the engine is not smoothly discharged due to air resistance, and 5 to 10% of the output is reduced.

  Therefore, it can be seen that the engine output can be improved and the fuel consumption can be improved simply by exhausting the exhaust gas smoothly.

  As described above, various proposals have been conventionally known in order to smoothly discharge exhaust gas.

  The following Patent Document 1 proposes an automobile exhaust pipe using an air flow, which is connected to a tailpipe using a stream of air generated by running of the automobile to connect the tail pipe to the streamline. A low pressure region is formed according to the flow velocity of the air passing through the main body of the gas, and the exhaust gas is sucked out rapidly by this low pressure to assist the exhaust.

  However, there is a disadvantage that it is structurally huge and complicated to attach such a streamlined exhaust body to an automobile, and it is not possible to induce a fast air flow when stopping or running at low speed, but rather only with a narrow exhaust passage There is a problem of hindering exhaust, and its practicality is low.

  Further, according to the tail pipe of the main silencer having the vortex generator of Patent Document 2 below, the vortex wing is provided in the middle of the tail pipe so as to be rotated by the exhaust gas. However, it is proposed that the vortex flow is generated and exhausted while rotating, but this provides a resistance to disturb the flow of the exhaust gas, so that it is substantially difficult to use.

  According to the automobile exhaust gas discharge device of Patent Document 3 below, a pipe attached with a bolt is provided at the end of the tail pipe, and a large number of vortex forming blades are radially formed on the inner peripheral edge of the pipe, Although it has been proposed to improve exhaust efficiency by swirling the exhaust gas, simply swirling the exhaust gas in this way is insufficient to exhaust quickly and smoothly, and as a result, the back pressure force In addition to being naturally evacuated, the efficiency is very low, with only a negligible effect that the vortex of the fluid partially assists the evacuation.

  Furthermore, according to the exhaust gas exhaust apparatus using the vortex flow described in Patent Document 4 below, eddy current generation having a vane that forms a vortex by letting external air flow into the pipe in front of the silencer formed in the exhaust gas path. It includes a sub duct in which a duct is formed and a valve whose opening degree is adjusted in proportion to the opening amount of the throttle valve is provided.

  However, this forms a duct through which the outside air flows into the front pipe of the silencer for removing the exhaust noise, so that the exhaust noise leaks into this duct and a large noise is generated, and the valve is large during acceleration. There is a problem that exhaust noise is generated even more when it is opened, and exhaust gas is exhausted to a sub duct with a lower air resistance compared to the inside of the silencer, so that the inflow air receives resistance and is difficult to put into practical use. There is.

  Furthermore, since the conventional technology allows outside air to flow into the inlet side of the silencer, the air resistance in the silencer exists as it is. Since the damper for adjusting the outside air that works with the throttle valve of the system is constructed, there is a problem that the equipment structure and facilities become complicated, and the outside air flows in and goes through the silencer, so it is included in the outside air inside the silencer There is a disadvantage that the foreign matter (dust, sand, etc.) that has been deposited accumulates and the function of the silencer is lowered.

  In order to solve the above-mentioned problems, the present inventor has proposed an automobile exhaust device of Patent Document 5 below.

  The patent has a structure that speeds up the flow rate by collecting the outside air from the traveling of the automobile in an expanded trumpet and increasing the exhaust pressure of the exhaust tailpipe.

  That is, the exhaust gas from the exhaust pipe is quickly discharged by increasing the air pressure passing through the small cross-sectional area by collecting the external air in the trumpet.

  Although this prior invention has some advantages in improving the output and fuel consumption by increasing the exhaust flow velocity, these proposals are also somewhat effective when stopped or running at low speed. It is insufficient.

  In addition, in the following Patent Document 6, the present inventor forms a quick exhaust airflow by separating fixed vanes that are notched at one end of the tail pipe and bent inward to form a fast exhaust airflow, and the outside air that flows back in the overlap state. In order to increase the engine output, the first and second fixings in which the tail pipe at the end of the silencer of the automobile is notched and bent inward through Patent Document 7 are proposed. The vanes 1 and 2 are provided, are spaced apart from each other by a predetermined distance, and are opposed to each other. The pipes 3 surround the first and second fixed vanes, and the first and second fixed vanes communicate with each other and are sealed with the atmosphere. Inventions related to a number of exhaust devices such as a proposal to induce a fast air flow at the exhaust end of a silencer by connecting a circulation exhaust device have been made.

The present invention is provided to improve the inventors' prior art.
Republic of Korea Patent Publication No. 2000-56951 Republic of Korea Published Patent No. 1998-75223 Korean Utility Model Registration No. 99434 Korean Patent Registration No. 257874 Korean Patent Registration No. 464711 Korean Patent Application No. 2004-13721 Republic of Korea Utility Model Registration No. 374553

  The present invention has been made in order to increase the efficiency by improving the problems of the prior art as described above and the prior application technique of the present inventor, and has the following objects.

  The object of the present invention is to exhaust the exhaust gas exhausted through the tail pipe of the silencer to increase the exhaust speed by the venturi phenomenon, to circulate and exhaust the inflowing outside air to accelerate the exhaust speed, and to quickly exhaust the exhaust gas. An object of the present invention is to provide an exhaust device for an automobile.

  Another object of the present invention is to exhaust the exhaust gas quickly, and to circulate and exhaust the exhaust gas flowing backward from the tail pipe to the atmosphere, so that the exhaust gas flows back into the engine or back pressure. It is an object of the present invention to provide an exhaust device for an automobile which can solve the problem of acting as an engine and achieve an increase in engine output.

  Still another object of the present invention is to increase the durability remarkably by making a rigid structure, and can be applied without changing the structure of an existing silencer, and has excellent compatibility. It is to provide an exhaust device.

  Still another object of the present invention is to reduce the backflow of exhaust gas and reduce the accumulation of combustion residues such as carbon, thereby extending the life of the engine and various exhaust systems such as an expensive soot purifier. It is an object of the present invention to provide an automotive exhaust that keeps parts clean and increases life.

  In order to achieve the above object, the present invention provides an exhaust device fitted to a tail pipe of a silencer in order to improve an exhaust gas flow of an automobile, and has an increased flow velocity at its exhaust inflow end as an extension tube. An extension tube forming a venturi conduit for the tube, an outside air discharge nozzle extending and projecting to the inside of the venturi conduit, a reverse flow inlet for inducing the inflow of outside air at the exhaust discharge end of the tube, and the reverse flow A cover attached to the extension tube to limit the chamber so that the inlet and the outside air discharge nozzle communicate with each other. Therefore, the exhaust is improved by suppressing the fast air flow and the reverse flow inflow at the exhaust end, and the output is improved.

  According to the present invention, since the circulation exhaust tool is additionally formed and coupled to the tail pipe of the silencer from which exhaust gas is exhausted, it can be easily attached without changing the design of the existing exhaust system. The exhaust gas is exhausted quickly due to the venturi phenomenon, and the outside air that flows back in is blocked from flowing in as a back air flow, and is received inside the chamber and circulated and exhausted, so the back pressure of the exhaust system is suppressed. This has the effect of improving exhaust efficiency and increasing engine output. In addition, the design of the outside air discharge nozzle and the reverse flow inlet is variably formed to facilitate the low pressure design inside the chamber, and the simple and robust structure makes the durability significantly increased. It can be applied without changing the structure of the silencer, has excellent compatibility, and minimizes exhaust gas backflow to reduce the accumulation of combustion residues such as carbon, thereby extending the life of the engine. It has various effects such as keeping various parts of the exhaust system clean, such as an expensive soot purifier, and increasing the service life. Although the main description of the present invention is directed to an automobile exhaust, it can be applied to the tail pipes of all silencers that use an internal combustion engine.

  Hereinafter, a detailed description will be given with reference to the accompanying drawings.

  2 to 4 of the accompanying drawings show basic embodiments of the present invention.

  It comprises an extension tube 10 fitted to a tail pipe at the end of a silencer of an automobile, and a venturi pipe 20 having a narrow pipe diameter for increasing the flow velocity is formed at the exhaust inflow end of the pipe. An outside air discharge nozzle 30 extending from the pipe line is formed on the inside of the pipe 20, and a backflow inlet 40 for inducing the inflow of outside air is formed at the exhaust discharge end of the tube body. A cover 50 attached to the extension tube 10 is formed so as to limit the chamber 52 so as to communicate with each other.

  On the other hand, in the present invention, as shown in FIG. 5, a second venturi pipe 22 having both ends expanded on the inner diameter of the venturi pipe 20 is further formed, and the outside air discharge nozzle 30 is extended to extend the second venturi pipe. A nozzle end is communicated with the passage 22, and the conduit 22 is formed so as to be supported by the nozzle 30 at the center of the venturi conduit 20.

  An outside air discharge nozzle 30 extending from the tube body 10 into the venturi pipe line 20 is formed so as to be inclined in the exhaust direction, and the nozzle is inclined so that the nozzle gradually becomes narrower from the chamber 52 side toward the discharge end. Consists of the body.

  In addition, the outside air discharge nozzle 30 may preferably be formed selectively from 2 to 4 (see FIG. 3).

  The reverse flow inlet 40 through which the outside air flows is formed at the exhaust end portion of the tube body 10 and is formed of a long hole-like pipe, and preferably formed selectively from 2 to 4 pipes. Yes (see FIG. 4).

  Reference numeral 16 (not shown) indicates a slit formed for pipe connection to the tail pipe of the silencer.

  The operation of the present invention having the technical configuration as described above will be described more specifically below.

  As shown in FIG. 6, the circulating exhaust device 100 of the present invention is fitted around the outside of a normal silencer 60 tail pipe and fixedly coupled with a clamp or the like to facilitate installation.

  If exhaust gas exhausted through a normal process by driving the engine flows into the silencer, the exhaust is silenced in the expansion chamber of the silencer 60 and then exhausted.

  As shown in FIG. 7, the exhaust gas discharged flows into the tube body 10 of the circulating exhaust device 100 of the present invention and proceeds at a high flow velocity in the Venturi pipeline 20 having a narrow tube diameter. In addition to increasing the exhaust speed, the outside air in the chamber 52 is drawn through the outside air discharge nozzle 30 extending into the venturi pipe 20 and is discharged together with the exhaust gas, and an instantaneous low pressure is formed inside the chamber. Then, the backflow is sucked into the backflow inlet 40 that forms a low pressure.

  Thus, in the cycle in which the reverse airflow does not act in the engine direction and is exhausted again through the chamber 52 of the circulating exhaust device, the process of being drawn into the venturi conduit and exhausted as described above is very quick. Repeatedly occurs.

  Therefore, the exhaust gas discharged with the negative pressure wave has a function of removing the back pressure by removing the negative pressure wave of the reverse airflow by the circulating exhaust tool.

  Here, looking at the engine driving process in which intake and exhaust are repeated dozens to hundreds of times per second, exhaust gas is generated such that exhaust and exhaust are repeated dozens to hundreds and dozens of times. At this time, the positive and negative pressures are repeatedly generated in the exhaust system, and the exhaust gas having the exhaust inertia generates a reverse inflow of outside air in the process of applying a negative pressure to the exhaust system. Although it has a side effect of reducing the engine output by acting as a back pressure, the present invention forms a low pressure inside the chamber 52 when the exhaust inertia acts in a state where the exhaust stops instantaneously. Since the outside air has a relatively low pressure and flows into the backflow inlet 40 having a small inflow resistance, the back pressure due to the backflow acting on the exhaust system is removed.

  Accordingly, exhaust gas is exhausted more rapidly into the silencer pipe from which exhaust gas is exhausted. At the same time, the reverse exhaust airflow during the overlap of the engine is circulated between the intake and exhaust by the circulating exhaust device 100. Since the exhaust is immediately re-discharged, the exhaust flow is prevented from being obstructed by the back flow, and the exhaust is smoothly performed. Therefore, the output is increased, the fuel is reduced, and the combustion foreign matter remaining in the exhaust system is smoothly discharged. This protects the equipment of the exhaust system and acts to extend the service life.

  As shown in FIG. 5, the present invention having the above-described structure can be modified.

  That is, according to the invention as shown in FIG. 5, the circulation action of the venturi conduit 20 and the chamber 52 described above is the same, and the second venturi conduit 22 is further added to the inner diameter portion of the venturi conduit 20. 2. The outside air discharge nozzle 30 is circulated and discharged through the two venturi line 22 to obtain a higher exhaust flow rate in addition to the fast flow rate of the venturi line 20 (see FIG. 8).

  The outside air discharge nozzle 30 has a function of increasing exhaust acceleration by forming a tube body having an inclined surface so as to become gradually narrower toward the end of the discharge nozzle as compared to the inflow end on the chamber 52 side. It is formed so as to incline in the traveling direction of the gas, and acts to reduce the resistance to the flow of exhaust.

  The reverse flow inlet 40 is located at the final end of the circulation exhaust tool, and acts to suppress the inflow of outside air into the exhaust gas discharge pipe as much as possible. 52 can be designed by selectively adjusting the area of the opening so that a temporary low pressure state is formed through the outside air discharge nozzle 30, as shown in FIG. It can be distributed along concentric circles.

  As shown in FIG. 9, the present invention in which the exhaust velocity is accelerated and exhausted quickly by the above-described configuration and the back pressure acting on the exhaust system is circulated and exhausted is modified for ease of manufacturing as shown in FIG. You can also.

  In other words, a tube body from which the engine exhaust gas is discharged is separated into an inflow side first tube body 12 and an exhaust side second tube body 14, and a venturi tube is formed at one end of the first tube body 12. A bending part 12a formed by a narrow pipe line is formed so as to form a path, a bending part 14a is also formed at one end of the second tubular body 14, and the bending parts 12a and 14a are opposed to each other and fixed by a cover 52. The bending portions 12a and 14a having a narrow diameter by being combined function as a venturi conduit and also serve as a ring-shaped outside air discharge nozzle.

  This has the advantage that the outside air discharge nozzle can be easily manufactured in the Venturi line, and it can be seen that the operation is the same as the basic embodiment of the present invention described above.

  The first and second tubular bodies 12 and 14 formed separately can be formed by radially welding small connecting plates 15 to the outer diameter of the tubular body in consideration of structural rigidity.

  As described above, the venturi structure that performs quick exhaust by increasing the flow rate of the exhaust gas of the engine and the exhaust in which the outside air discharge nozzle and the reverse flow inlet are formed so that the inside of the chamber forms a low-pressure chamber inside the venturi pipe It is apparent that the structure of the tool can be designed in various ways by the technology described in the claims, and modifications including the gist of the technology are included in the claims of the present invention.

  On the other hand, although the main description of the present invention is directed to an automobile exhaust device, it can be applied to the tail pipe of any silencer using an internal combustion engine.

FIG. 3 is a cross-sectional view showing an automobile exhaust device, which is a prior art filed earlier by the present inventor. 1 is a configuration cross-sectional view as one embodiment of the present invention. FIG. 3 is a cross-sectional configuration diagram taken along the line AA of the invention shown in FIG. 2. FIG. 3 is a right side view of the invention shown in FIG. 2. It is a structure sectional view as other embodiments of the present invention. It is an installation state figure of the present invention. FIG. 3 is an operational state diagram showing an exhaust flow of the invention shown in FIG. 2. It is an operation state figure which shows the flow of the exhaust_gas | exhaustion of invention shown in FIG. It is a structure sectional view as another embodiment of the present invention.

Claims (5)

An exhaust fitting that fits into the tailpipe of a silencer to improve the flow of exhaust gas in an automobile,
As an extension pipe, an extension pipe that forms a venturi pipe for increasing the flow velocity at the exhaust inflow end, an outside air discharge nozzle that protrudes inside the venturi pipe, and an exhaust discharge end of the pipe An automotive exhaust device comprising a reverse flow inlet for inducing outside air inflow, and a cover attached to the extension pipe so as to limit the chamber so that the reverse flow inlet and the external air discharge nozzle communicate with each other.   As the auxiliary venturi pipe, both ends are expanded to the inner diameter of the venturi pipe, the outside air discharge nozzle is extended long, and the nozzle end portion is communicated with the auxiliary venturi pipe. The auxiliary venturi pipe 22 is connected to the venturi pipe. The automobile exhaust device according to claim 1, further comprising an auxiliary venturi pipe supported by the outside air discharge nozzle 30 at a center of the road.   The outside air discharge nozzle extended from the extension pipe body into the venturi pipe is formed so as to incline in the exhaust direction, and the outside air discharge nozzle has an inclined surface so that it gradually narrows from the chamber side toward the end of discharge. It consists of a pipe body, The exhaust device for motor vehicles of Claim 1 or 2 characterized by the above-mentioned.   The exhaust device for an automobile according to claim 1 or 2, wherein the outside air discharge nozzle and the backflow inlet include at least two.   The extension pipe is formed into a first pipe body on the inflow side and a second pipe body on the discharge side, and is formed with a narrow pipe diameter so as to form a venturi conduit at one end of the first pipe body. A bending portion is provided, a bending portion is formed at one end of the second tube, the bending portions of the first and second tubes are opposed to each other and fixedly coupled by a cover, and the bending portion having a narrow diameter is a venturi conduit The vehicle exhaust device according to claim 1, wherein the exhaust device functions as a ring and also serves as a ring-shaped outside air discharge nozzle.

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