APPARATUS FOR REMOVING INTAKE PRESSURE AND PREVENTING BACKFLOW FOR INTERNAL COMBUSTION ENGINES

[Technical Field]

The present invention relates to an apparatus for removing intake pressure and preventing backflow for internal combustion engines. More particularly, the apparatus for removing intake pressure and preventing backflow includes a hollow second suction pipe, which has fixing flanges protruding from the outer circumference and a plurality of fixing holes in the fixing flange, and a Venturi-shaped fixed pipe fixed, at one end, to the inner circumference of the second suction pipe, tapered towards the other end, and having a plurality of fixed pipe flow holes in the circumference thereof, so that a backflow channel functioning as a Venturi tube is formed between the fixed pipe and the second suction pipe.

The fixed pipe and the second suction pipe are disposed in at least one selected from the group consisting of a joining portion of an air suction pipe and a throttle body, a joining portion of the throttle body and a surge tank and a joining portion of the suction manifold and the internal combustion engine .

According to the above-mentioned structure, the mixed air can be quickly introduced, and the backflow gas can be easily reintroduced to circulate in order to enable complete combustion, thereby improving the performance of an internal combustion engine while realizing advantages such as improved fuel

efficiency, enhanced power, reduced exhaust fumes and maximized energy efficiency.

Furthermore, a plurality of apparatuses for removing intake pressure and preventing backflow for internal combustion engines can be disposed inside a suction pipe structure of the internal combustion engine in order to more quickly and efficiently introduce the suction air and also quickly reintroduce the backflow gas to circulate.

[Background Art] In general, an internal combustion engine generates power through four strokes in the order of suction, compression, explosion and exhaust, and rotates a drive shaft using the power, thereby actuating a machine.

Among the four strokes, the suction stroke serves to introduce ambient air to mix with fuel, which is converted into fine particles while being carried, thereby feeding the mixed gas into a combustion chamber of a cylinder.

When the mixed gas enters the combustion chamber, the cylinder rises to compress the mixed gas, an ignition plug generates a spark, which makes the mixed gas explode, and then the cylinder is pushed down by the explosion, thereby generating power.

New mixed gas fills the combustion chamber again while exhaust gas, produced by the explosion, exits through an exhaust pipe .

The power is consecutively generated by the repetition of the four strokes, and the stroke time is shortened in order to increase the power.

In the exhaust and suction of the four strokes, new mixed gas, taken in after the exhaustion of the exhaust gas, is required in order to feed to the combustion chamber. However, residual combustion gas, which is not exhausted, and the exhaust gas flow backwards into the combustion chamber.

Then, the new mixed gas is filled, is compressed, and explodes together with the residual combustion gas, thereby degrading the power.

This is because exhaust pressure and valve overlap produce backflow gas (i.e., exhaust gas flowing backwards), which then enters again the combustion chamber. The backflow gas hinders the inflow of the mixed gas, thereby causing incomplete combustion.

Furthermore, when the mixed gas is taken in, the amount of mixed gas feeding the combustion chamber of the cylinder is smaller than the amount of mixed gas that is supplied. Since the mixed gas is continuously supplied by a throttle body, a portion of the mixed gas residing in a suction manifold flows backwards, thereby degrading suction. [Disclosure]

The present invention has been made to solve the foregoing problems with the prior art, and therefore the present invention provides an apparatus for removing intake pressure and preventing backflow for internal combustion engines. The apparatus for removing intake pressure and preventing backflow includes a hollow second suction pipe and a Venturi-shaped fixed pipe. The hollow second suction pipe has fixing flanges protruding from the outer circumference and a plurality of

fixing holes in the fixing flange, and the fixed pipe is fixed, at one end, to the inner circumference of the second suction pipe, is tapered towards the other end, and has a plurality of fixed pipe flow holes in the circumference thereof, so that a backflow channel functioning as a Venturi tube is formed between the fixed pipe and the second suction pipe.

The fixed pipe and the second suction pipe are disposed in at least one selected from the group consisting of a joining portion of an air suction pipe and a throttle body, a joining portion of the throttle body and a surge tank and a joining portion of the suction manifold and the internal combustion engine .

According to the above-mentioned structure, the mixed air can be quickly introduced, and the backflow gas can be easily reintroduced to circulate in order to realize complete combustion.

This structure can improve the performance of an internal combustion engine and achieve merits such as improved fuel efficiency, enhanced power, reduced exhaust fumes and maximized energy efficiency.

Furthermore, a plurality of the apparatuses for removing intake pressure and preventing backflow can be disposed inside a suction pipe structure of the internal combustion engine in order to more quickly and efficiently introduce the suction air and also quickly reintroduce the backflow gas to circulate.

According to an aspect of the present invention, the apparatus for removing intake pressure and preventing backflow for internal combustion engines includes a hollow second suction

pipe disposed in a suction pipe structure of the internal combustion engine to allow mixed gas of suction air and fuel, which are separately supplied, to pass through, thereby feeding the mixed gas to the internal combustion engine, wherein the suction pipe structure includes an air suction pipe, a throttle body, a surge tank and a suction manifold; and a Venturi-shaped fixed pipe fixed, at a first end, to an inner circumferential portion of the second suction pipe, tapered towards a second end, and having a plurality of fixed pipe flow holes in circumferential portions thereof. A backflow channel is formed between the fixed pipe and the second suction pipe to function as a Venturi tube to which backflow gas, produced from backflow of part of the introduced mixed gas that failed to enter a combustion chamber, is introduced, so that the backflow gas is introduced from the backflow channel through the fixed pipe flow holes into the fixed pipe, and is then reintroduced to circulate, by a continuous suction flow of mixed gas, to the combustion chamber. The fixed pipe and the second suction pipe are disposed in at least one selected from the group consisting of a joining portion of the air suction pipe and the throttle body, a joining portion of the throttle body and a surge tank and a joining portion of the suction manifold and the combustion chamber .

The second suction pipe may include a fixing flange protruding from the outer circumference thereof and a plurality of fixing holes in the fixing flange, wherein the fixing flange is disposed between respective ends of the at least one joining portion, and is fitted thereto by a separate fixing member.

The apparatus for removing intake pressure and preventing backflow may further include an internal communication vessel disposed at the second end of the fixed pipe, the internal communication vessel having a honeycomb structure. The apparatus for removing intake pressure and preventing backflow may further include a fixed pipe blade structure disposed inside the fixed pipe, wherein the fixed pipe blade structure increases the flow rate of the suction air, minimizes the collision with the suction air, and quickly reintroduces the backflow gas exiting the fixed pipe flow holes.

The fixed pipe blade structure may include a plurality of blades disposed on the inner circumferential portions of the fixed pipe at a predetermined interval, at positions between the fixed pipe flow holes, and a conical blade body disposed at a central portion of the fixed pipe, to which the blades join.

Here, the blades may be bent and inclined around a reference line, along the inflow direction of the suction air.

The apparatus for removing intake pressure and preventing backflow may further include a blade communication vessel disposed at the second end of the fixed pipe, the blade communication vessel having a honeycomb structure.

The apparatus for removing intake pressure and preventing backflow may further include a fixed pipe blade structure disposed inside the fixed pipe, wherein the fixed pipe blade structure has a tapered configuration, with its sectional area decreasing along the inflow direction of the suction air, in order to increase the flow rate of the suction air, and defines, with the inner circumference of the fixed pipe, a second

backflow channel to communicate with the fixed pipe flow holes .

The apparatus for removing intake pressure and preventing backflow may further include a blade communication vessel disposed inside the fixed pipe blade structure, at one end in the inflow direction of the suction air, the blade communication vessel having a honeycomb structure .

[Description of Drawings]

FIG. 1 is a perspective view illustrating an apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention;

FIG. 2 is a perspective cross-sectional view illustrating part of FIG. 1, taken along the line A-A' thereof;

FIG. 3 is a side cross-sectional view illustrating the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention;

FIG. 4 is a cross-sectional view illustrating the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, which further includes an internal communication vessel therein; FIG. 5 is a cross-sectional view illustrating an embodiment of the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, which further includes a fixed tube blade structure; FIG. 6 is a cross-sectional view illustrating another embodiment of the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, which further includes a fixed tube blade

structure;

FIG. 7 is a cross-sectional view illustrating another embodiment of FIG. 6, which further includes a blade communication vessel; FIG. 8 is a cross-sectional view illustrating a further embodiment of the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, which further includes a fixed tube blade structure; FIG. 9 is a cross-sectional view illustrating another embodiment of FIG. 8, which further includes a blade communication vessel;

FIG. 10 is a perspective cross-sectional view illustrating the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, which is fitted to a joining portion of an air suction pipe and a throttle body,-

FIG. 11 is a cross-sectional view illustrating the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, which is fitted to a joining portion of an air suction pipe and a throttle body via an auxiliary fixing member;

FIG. 12 a perspective view illustrating another embodiment of the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, to which a second suction pipe is applied;

FIG. 13 is a perspective cross-sectional view illustrating part of FIG. 12, taken along the line A-A' thereof;

FIG. 14 is a side cross-sectional view of FIG. 12; and FIG. 15 is a configuration view illustrating the construction state of the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention.

[Best Mode]

Hereinafter, the present invention will be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. These embodiments presented in the following description are provided by way of explanation only. It will be apparent to those skilled in the art that such features can be modified or altered within the scope of the invention.

FIG. 1 is a perspective view illustrating an apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, FIG. 2 is a perspective cross-sectional view illustrating part of FIG. 1, taken along the line A-A' thereof, FIG. 3 is a side cross- sectional view illustrating the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, FIG. 4 is a cross-sectional view illustrating the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, which further includes an internal communication vessel therein, FIG. 5 is a cross-sectional view illustrating an embodiment of the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, which further includes a fixed tube

blade structure, FIG. 6 is a cross-sectional view illustrating another embodiment of the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, which further includes a fixed tube blade structure, FIG. 7 is a cross-sectional view illustrating another embodiment of FIG. 6, which further includes a blade communication vessel, FIG. 8 is a cross-sectional view illustrating a further embodiment of the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, which further includes a fixed tube blade structure, FIG. 9 is a cross-sectional view illustrating another embodiment of FIG. 8, which further includes a blade communication vessel, FIG. 10 is a perspective cross-sectional view illustrating the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, which is fitted to a joining portion of an air suction pipe and a throttle body, FIG. 11 is a cross-sectional view illustrating the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, which is fitted to a joining portion of an air suction pipe and a throttle body via an auxiliary fixing member, FIG. 12 a perspective view illustrating another embodiment of the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention, to which a second suction pipe is applied, FIG. 13 is a perspective cross-sectional view illustrating part of FIG. 12, taken along the line A-A' thereof, FIG. 14 is a side cross-sectional view of FIG. 12, and FIG. 15 is a configuration

view illustrating the construction state of the apparatus for removing intake pressure and preventing backflow for internal combustion engines of the present invention.

As shown in the drawings, the apparatus for removing intake pressure and preventing backflow 10 includes a second suction pipe 100 and a fixed pipe 110, which are concentric and have different diameters.

The second suction pipe 100 is fixedly mounted inside a suction pipe structure 1, which introduces air into an internal combustion engine. Particularly, the second suction pipe 100 is fixed to a part to which respective components are connected.

The second suction pipe 100 is fitted to at least one selected from a joining portion of an air suction pipe 2 and a throttle body 3, a joining portion of the throttle body 3 and a surge tank 4 and a joining portion of a suction manifold 5 and an engine. The second suction pipe 100 removes intake pressure and quickly and efficiently introduces backflow gas into a combustion chamber, by reintroducing the backflow gas on a new suction air flow. The second suction pipe 100 has a hollow pipe structure, and is fitted into the suction pipe structure 1. Specifically, the second suction pipe 100 is fixed to the suction pipe structure 1 through face-to-face contact by a fixing member (not shown) . A fixed pipe 110 having a plurality of fixed pipe flow holes 112 along the circumference thereof is fitted inside the second suction pipe 100. A backflow channel 120 is formed between the fixed pipe 110 and the second suction pipe 100, and

is open in one direction.

Particularly, the fixed pipe 110 is fixed, at one end thereof, to the interior of the second suction pipe 100, and is tapered towards the other end thereof, so that the backflow channel 120 is open in the same direction as the other end of the fixed pipe 110.

The backflow channel 120 communicates, at portions opposite the open end thereof, with the fixed pipe flow holes

112. In the suction stroke of a four-stroke combustion process, intake pressure occurs in a combustion chamber of a cylinder due to the structure of an internal combustion engine. The intake pressure makes it difficult for mixed gas to enter, and due to the backflow of the mixed gas, caused in this way, introduced suction air also flows backwards. Accordingly, the backflow gas is introduced into the backflow channel 120, so that it can circulate.

The backflow gas, moving along the backflow channel 120 as described above, flows into the fixed pipe 110 through the fixed pipe flow holes 112, and is then quickly introduced, by new ambient air, into the combustion chamber of an engine 6, to thereby realizing complete combustion.

The fixed pipe 110, thanks to its funnel shape tapered from one end thereof coupled to the second suction pipe 110 towards the other end, increases the flow rate of the mixed gas.

The funnel shape also changes the interval from the second suction pipe 100, so that the opposite ends of the backflow channel 120 have different sectional areas.

The sectional area of the backflow channel 120, gradually- increasing from one end communicating with the fixed pipe flow holes 112 towards the other end, causes an increase in the flow rate of the backflow gas, introduced through the other end, thereby enabling the backflow gas to quickly and efficiently enter the backflow channel 120 and easily pass through the fixed pipe flow holes 112.

As shown in FIG. 4, an internal communication vessel 130 is fitted in the other end of the fixed pipe 110. The internal communication vessel 130 has a honeycomb structure, which prevents the suction air from dispersing at the verge of the fixed pipe 110, so that the suction air can more quickly and efficiently enter.

As shown in FIGS. 5 to 7, a fixed pipe blade structure 140 is fitted inside the fixed pipe 110 in order to more quickly introduce the suction air. The efficient introduction of the suction air can quickly introduce the backflow gas, which is introduced into the fixed pipe 110 through the fixed pipe flow holes 112. The fixed tube blade structure 140 includes a blade body and a plurality of blades. The blades are fitted to the interior of the fixed pipe 110, between the fixed pipe flow holes 112, and the blade body has a conical shape, and is disposed in the central portion to which the blades are joined. While the blade body has a conical shape in this embodiment of the present invention, this can be modified into any other shape as long as it can make the suction air quickly and efficiently flow inside the fixed pipe 110.

As shown in FIG. 6, a fixed tube blade structure 140' is provided as another embodiment . In the fixed tube blade structure 140, blades are bent and inclined around the reference line, along the inflow direction of the suction air, in order to quickly introduce the suction air. Accordingly, the backflow gas, passed through the fixed pipe flow holes 112, can be quickly reintroduced to circulate.

As shown in FIG. 7, a blade communication vessel 150 having a honeycomb structure is fitted to the other end of the fixed pipe 110, which is not fixed, in order to introduce the suction air more quickly. The efficient introduction of the suction air can make the backflow gas, introduced through the fixed pipe flow holes 112, flow quickly.

As shown in FIG. 8, a fixed pipe blade structure 140" is fitted inside the fixed pipe 110. The fixed plate structure 140" has one end connected to the inner circumference of the fixed pipe 110, and is tapered towards the other end.

The fixed pipe blade structure 140" has a tapered configuration, in which the sectional area thereof decreases in the inflow direction of the suction air (i.e., towards the other end) , thereby defining a second backflow channel 160" with the fixed pipe 110.

The fixed pipe blade 140", tapered towards the other end, can increase the flow rate of the suction air, introduced into the suction pipe structure 1, so that the suction air can easily enter.

The second backflow channel 160" is designed to prevent the backflow gas, introduced into the backflow channel 120, from

potentially flowing backwards while passing through the fixed pipe flow holes 112. With the second backflow channel 160", the backflow gas can be more quickly introduced.

As shown in FIG. 9, a blade communication vessel 150" having a honeycomb structure is fitted to the other end of the fixed pipe blade structure 140" in order to more easily introduce the suction air. Thanks to the efficient introduction of the suction air, the backflow gas, introduced through the fixed pipe flow holes 112, can be quickly introduced. FIGS. 10 and 11 show the apparatus for removing intake pressure and preventing backflow 10, which is fitted to the joining portion of the air suction pipe 2 and the throttle body 3, particularly, through the second suction pipe 100, interference-fitted into the throttle body 3. The air suction pipe 2 connected to the throttle body 3 is a bellows pipe, and an auxiliary fixing member 170 is provided on the outer circumference of the bellows-shaped air suction pipe 2. The fixing member 170 fixes the air suction pipe 2 by pressing toward the second suction pipe 110, thereby more securely fixing the apparatus for removing intake pressure and preventing backflow 10.

The auxiliary fixing member 170 is preferably shaped as a band that can be fixed by a separate clamp or clip.

As shown in FIGS. 12 to 14, a second suction pipe 110' has the form of a hollow pipe, and has a fixing flange 102' protruding from the outer circumference thereof and a plurality of fixing holes 104' in the fixing flange 102'.

The fixing flange 102' of the second suction pipe 100' is

inserted into the joining portion of the suction pipe 2 and the throttle body 3, the joining portion of the throttle body 3 and the surge tank 4 and the joining portion of the suction manifold 5 and the engine 6 in the suction pipe structure 1, and is fixed thereto by a separate fixing member (not shown) .

The fixing member may be implemented as a conventional fixing member that is used to connect respective components of the suction pipe structure 1. To fix the second suction pipe 100' to the suction pipe structure 1, the fixing flange 102' is fixed by fastening the fixing member in the direction parallel to the flow direction of the suction air.

As shown in FIG. 15, the apparatus for removing intake pressure and preventing backflow 10 including the second suction pipe 100 and the fixed pipe 110 is fitted to at least one selected from the joining portion of the air suction pipe 2 and the throttle body 3, the joining portion of the throttle body 3 and the surge tank 4 and the joining portion of the suction manifold 5 and the engine 6 in the suction pipe structure 1.

The apparatus for removing intake pressure and preventing backflow 10, fitted to the joining portion of the air suction pipe 2 and the throttle body 3, the joining portion of the throttle body 3 and the surge tank 4 and/or the joining portion of the suction manifold 5 and the engine 6, reintroduces and circulates the backflow gas occurring at respective joining portions, thereby quickly introducing it, by new suction air flow, into the combustion chamber.

[industrial Applicability] According to the apparatus for removing intake pressure

and preventing backflow for internal combustion engines of the present invention, the backflow gas, flowing backwards in the suction stroke, is introduced into the backflow channel, disposed between the second suction pipe and the fixed pipe to act as a Venturi tube, flows through the fixed pipe flow holes into the Venturi-shaped fixed pipe, and is then quickly and efficiently introduced, by new suction air, into the combustion chamber of the engine. Accordingly, the apparatus for removing intake pressure and preventing backflow can prevent the backflow gas from hindering the inflow of the suction air.

When the backflow gas is prevented from entering and intake pressure is thus removed, mixed air can be quickly and efficiently introduced, thereby enabling complete combustion. This, as a result, can improve the performance of the internal combustion engine, thereby achieving merits such as improved fuel efficiency, enhanced power, reduced exhaust fumes and maximized energy efficiency.

Furthermore, a plurality of the apparatuses for removing intake pressure and preventing backflow can be disposed inside a suction pipe structure of the internal combustion engine in order to more quickly and efficiently introduce the suction air and also quickly reintroduce the backflow gas to circulate.