JP3889777B1 - Vortex generator for internal combustion engine - Google Patents

Abstract

The present invention can make an intake flow smoothly vortex from a low flow rate state to a high flow rate state, improve the intake efficiency in the entire flow velocity range, and has a simple device configuration, cleaning, An eddy current generator for an internal combustion engine that can be easily replaced is provided.
A funnel-shaped vortex generator body having a proximal end connected to a distal end of an intake pipe of an internal combustion engine and gradually expanding in diameter toward an open end, and an inner peripheral surface of the vortex generator main body in substantially the same direction And a plurality of guide plates projecting at substantially equal intervals, the plurality of guide plates being substantially tangential from the inner peripheral edge of the opening end toward the inner circle formed by the base end portion, and the intake pipe The vortex generator body is configured to protrude substantially outside the intake pipe when virtually extended into the vortex generator body, and an air through hole is formed between the guide plates on the peripheral wall of the vortex generator body.
[Selection] Figure 4

Description

  The present invention relates to a vortex generator that generates a vortex in an intake pipe that supplies air to a combustion chamber of an internal combustion engine.

  For example, the air sucked into the internal combustion engine is sent from the suction port to the filter box through the intake pipe (hereinafter referred to as “first intake pipe”), and is filtered by the filter element. The filtered air is sent to the carburetor through an intake pipe (hereinafter referred to as “second intake pipe”) that communicates the filter box and the carburetor.

  At the intake port at the tip of the first intake pipe and at the connecting part between the filter box and the second intake pipe, the cross-sectional area of the intake passage is abruptly reduced, so that the intake flow is disturbed and the intake efficiency is deteriorated. As a technique for reducing the turbulence of the intake air flow, it is known that a vortex flow can be generated in the intake air flow to improve the intake efficiency. For example, Japanese Utility Model Laid-Open No. 5-24941 and Japanese Patent Application Laid-Open No. 2000-18108 are known. There is a technique disclosed in the publication.

  The technology disclosed in Japanese Utility Model Laid-Open No. 5-24941 discloses that “a negative pressure is prevented from being generated on the back surface of a blade for giving a swirling motion to an airflow passing through an intake passage or an exhaust passage of an internal combustion engine, thereby reducing a ventilation resistance. This technique is intended to reduce, and an outline of this technique will be described with reference to FIG. 8 is a vortex generator device according to an embodiment disclosed in Japanese Utility Model Laid-Open No. 5-24941. FIG. 8A is a cross-sectional view of the vortex generator device installed in an internal combustion engine. (B) is a perspective view of a vortex generator.

As shown in FIG. 8, the eddy current generating device 103 is provided on the inner peripheral side of the annular filter element 102a, and the eddy current generating device 103 is formed into a disk-shaped base portion 103a and one or more elongated slits 103c. The base portion 103a is adapted as a fixing part for bolts and nuts, and each wing member 103d is appropriately arranged radially and at equal intervals and with respect to the diameter line. It is installed on the base 103a with a slight inclination. Then, the swirling motion is given to the airflow that has passed through the filter element 102a by the vortex generator 103.
In another embodiment, the base portion is formed in a cylindrical shape, and the blade members 103d are radially arranged on the inner surface of the base portion at equal intervals and are arranged in the intake pipe. A propeller-like twist is added to each wing member 103d.
With this configuration, “the air sucked during the intake stroke of the internal combustion engine is filtered by the filter, and then flows into the combustion chamber as a swirl flow by the plurality of blade members of the vortex generator disposed in the intake passage. In addition, since the intake air flow also flows through the slits formed in each wing member, negative pressure is not generated on the back surface of the wing member, and the ventilation resistance does not need to be increased.

  The technique disclosed in Japanese Patent Application Laid-Open No. 2000-18108 is a technique aimed at “in an intake device of an internal combustion engine, aiming at further improvement of intake efficiency and consequently improving output of the internal combustion engine”. The outline of this technique will be described with reference to FIG. FIG. 9 is an intake device diagram of an internal combustion engine according to an embodiment disclosed in Japanese Patent Laid-Open No. 2000-18108. FIG. 9A is a front view showing the structure of the intake device of the internal combustion engine. (B) is IX-IX arrow sectional drawing of Fig.9 (a).

As shown in FIG. 9, a gas introduction port 231 extending in the tangential direction of the inner peripheral surface of the intake device 230 is formed on the side surface of the distal end portion of the intake device 230. The gas introduction port 231 is provided to give a vortex to the intake air flowing from the surge tank 212 to the intake pipe 211 through the intake device 230. The intake air collected in the surge tank 212 is sucked into the intake pipe 211 through the intake device 230 as the piston of the internal combustion engine descends. At this time, the intake air in the surge tank 212 flows into the intake device 230 from the gas inlet 231 in addition to the opening at the tip of the intake device 230. The intake air flowing from the gas inlet 231 flows along the inner peripheral surface of the intake device 230. As a result, a vortex is imparted to the intake air flowing through the intake device 230 and the intake pipe 211.
According to this configuration, “a negative pressure is generated at the center of the vortex flow, so that intake of the intake air is generated by this negative pressure. As a result, the intake air flow rate in the intake pipe 211 is increased. Accordingly, the wall resistance between the main flow of the intake air flowing through the center of the vortex flow and the inner peripheral surface of the intake pipe 211 can be greatly reduced. In addition, the wall resistance between the main flow of intake air and the inner peripheral surface of the intake pipe 211 is reduced, thereby improving the intake efficiency and, consequently, improving the output of the internal combustion engine. It is said.
Japanese Utility Model Publication No. 5-24941 JP 2000-18108 A

However, in the technique disclosed in Japanese Utility Model Laid-Open No. 5-24941, the air sucked during the intake stroke of the internal combustion engine is filtered by the filter element and then the plurality of blades of the eddy current generator disposed in the intake passage. Although the swirl motion is given by the member 103d to make the intake air flow in the vertical direction, the flow of the intake air flow is not smooth because the air flow is bent from the horizontal direction to the vertical direction. Has its own limits.
Further, in another embodiment arranged in the intake pipe, each wing member 103d inside the intake passage becomes an obstacle to be installed in the intake pipe.

  The technique disclosed in Japanese Patent Laid-Open No. 2000-18108 is a device that is attached to a surge tank, not a filter box, and requires an intake vortex flow imparting mechanism for causing air to flow out from the gas inlet 231 in order to generate a vortex flow. Since the apparatus becomes relatively large and exhaust gas is used for the air flowing out from the gas introduction port 231, not only a reflux pipe from the exhaust port to the gas introduction port 231 is required but also the intake air is contaminated. There is a risk that the exhaust gas is mixed. Further, when this device is used in a filter box, the filter element is contaminated, and the intake efficiency and life of the filter element are reduced.

  Therefore, the present invention can smoothly make the intake flow vortex from a low flow rate state to a high flow rate state, improve the intake efficiency in the entire flow velocity range, and the configuration of the device is simple, cleaning and replacement. An object of the present invention is to provide an eddy current generator for an internal combustion engine that can be easily operated.

In order to achieve the above object, a vortex generator for an internal combustion engine according to claim 1 of the present application is connected to an upstream end of an intake pipe of the internal combustion engine and is provided downstream of a filter box (54) containing a filter element (52) therein. In the overflow generator also serving as a box, a funnel-shaped overflow generator body (1, 2) gradually expanding from the base end connected to the intake pipe toward the upstream opening end, and the overflow generator A plurality of guide plates (30) on the funnel-shaped inner peripheral surface of the generator body at substantially the same direction and at substantially equal intervals, on the circumference of the inner circle formed by the base end portion from the inner peripheral edge of the upstream opening end. The guide plate is projected on a virtual tangent line that is drawn so as to be in contact with the guide plate, and the end portion in the center direction of the overflow generator extends to a position where the intake pipe is virtually extended into the previous overflow generator body. An air through hole (20) is formed between the guide plates of the funnel-shaped peripheral wall of the flow generator body. Wherein, it is characterized in that.
The cylindrical intake pipe refers to an intake pipe (first intake pipe described above) communicating with the filter box and an intake pipe (second intake pipe described above) connecting the filter box and the vaporizer.
The “substantially the same direction” means that the inclination of the plurality of guide plates with respect to the inner peripheral surface and the inclination of the inner peripheral surface of the plurality of guide plates with respect to the inner peripheral surface of the mounting portion are substantially the same.
In addition, “projecting substantially on the tangent” means that the length of the fixed portion of the guide plate to the inner peripheral surface of the vortex generator main body is equal to or less than the total length of the tangent, and the tangent is centered on the tangent. Means that the guide plate is fixed, and the fixed portion of the guide plate may be a straight line or a curved line.

  Moreover, the eddy current generator of the internal combustion engine according to claim 2 of the present application is the eddy current generator of the internal combustion engine according to claim 1, wherein the area of the air through hole is 40% to 120% of the area of the guide plate. %.

  An eddy current generator for an internal combustion engine according to claim 3 of the present application is the eddy current generator for an internal combustion engine according to claim 1, wherein the area of the air through hole is 70% to 100% of the area of the guide plate. %.

Moreover, the eddy current generator of the internal combustion engine which concerns on this-application Claim 4 is an overflow generator of the internal combustion engine in any one of Claims 1-3, Comprising: The funnel-shaped surrounding wall of the said overflow generator main body is the above-mentioned. By cutting along the edge of the plane figure with the tangent as the base, and bending the plane figure at an appropriate angle inside the vortex generator body with the tangent as the fold line, or the side of the plane figure The guide plate and the air through hole are formed by cutting out along the edge and fixing the bottom of the plane figure along the tangent line to the inside of the overflow generator body at a predetermined angle; It is characterized by.
In this invention, two are shown with respect to the method of forming a guide plate and an air through-hole.
That is,
(1) A guide plate and an air through hole are formed by making a cut along an edge other than the bottom of the plane figure and folding the plane figure at an appropriate angle inside the eddy current generator body with a tangent as a fold line. How to
(2) A guide plate and an air through hole are formed by cutting out along all edges of the plane figure and fixing the bottom side of the plane figure along the tangent to the inside of the vortex generator main body at an appropriate angle. Is the method.

  And the eddy current generator of the internal combustion engine which concerns on this-application Claim 5 is an overflow generator of the internal combustion engine in any one of Claims 1-4, Comprising: The said eddy current generator main body is attached or detached with respect to the said intake pipe. It is characterized by being free.

According to the invention according to claim 1 of the present application, the eddy current generator is composed only of a funnel-shaped eddy current generator main body and a plurality of guide plates protruding from the inner peripheral surface of the eddy current generator main body. The structure is extremely simple. For example, when the eddy current generator is made of a synthetic resin, it can be integrally formed, so that the manufacturing cost can be kept low.
Furthermore, since the funnel-shaped vortex generator body with the open end is connected to the tip of the intake pipe, the intake flow smoothly flows linearly from the vortex generator body into the intake pipe.
For this reason, the intake efficiency is improved and the drive efficiency is increased.
In addition, air around the intake flow that flows in linearly is also sucked into the intake pipe along the peripheral wall of the funnel-shaped vortex generator body. Since the air around the intake flow that flows linearly by the guide plate generates vortices, the air around these is also drawn into the intake pipe smoothly by the vortices.

  In addition, since an air through hole is formed between the guide plates on the peripheral wall of the vortex generator body, even when the installation space of the vortex generator is narrow, such as a filter box, intake air from the horizontal direction This is possible, and it is possible to prevent the accumulation of air in the filter box or the like.

Furthermore, according to the invention according to claim 2 or 3, the area of the air through hole is preferably approximately 40% to 120%, more preferably approximately 70% to 100% with respect to the area of the guide plate.
If the area of the air through hole is small, the negative pressure described above cannot be effectively eliminated, and if the area of the air through hole is large, the vortex of the surrounding air is disturbed. Is preferably about 90% of the area of the guide plate.

Further, according to the invention of claim 4 of the present application, a cut is made or cut out along the edge of the plane figure drawn on the peripheral wall of the eddy current generator body, and it is bent or fixed at an appropriate angle. By doing so, a guide plate and an air through hole are formed.
Accordingly, since there is no material loss in manufacturing, initial costs such as manufacturing costs are low.
The appropriate angle means an angle at which the vortex-making effect by the guide plate is maximized, but the angle varies depending on the shape, area, etc. of the guide plate.

According to the invention of claim 5 of the present application, the vortex generator body is detachable from the intake pipe.
That is, since the vortex generator itself is detachable from the intake pipe, it is very easy to attach and remove, and it is not necessary to attach it at the time of manufacture, and it can be attached to an existing internal combustion engine.
Further, since the eddy current generator can be removed and cleaned, the cleaning operation can be performed very easily.
In addition, detachable can be made detachable by well-known means such as screwing, fitting, insertion, or clamping between the base end portion and the intake pipe.

  Embodiments 1 and 2 of an internal combustion engine vortex generator (hereinafter simply referred to as “vortex generator”) according to the best mode for carrying out the invention of the present application will be described below with reference to FIGS. explain. 1 is a perspective view of the eddy current generator according to the first embodiment, FIG. 2 is an operation explanatory view of the eddy current generator according to the first embodiment, FIG. 2A is a plan view, and FIG. ) Is a cross-sectional view taken along the line II-II in FIG. 2 (a), FIG. 3 is a view showing an attachment state of the eddy current generator according to the first embodiment, and FIG. 4 is a perspective view of the eddy current generator according to the second embodiment. 5A and 5B are diagrams for explaining the operation of the eddy current generator according to the second embodiment. FIG. 5A is a plan view, FIG. 5B is a cross-sectional view taken along the line V-V in FIG. FIG. 7 is an attachment situation diagram of the eddy current generator according to the second embodiment, and FIG. 7 is an attachment situation diagram of the eddy current generator according to the first and second embodiments.

  1 to 7, reference numeral 1 denotes a vortex generator according to the first embodiment, reference numeral 2 denotes a vortex generator according to the second embodiment, reference numeral 10 denotes a vortex generator body, reference numeral 12 denotes a vortex generator funnel, reference numeral 14. Is a vortex generator joint, 16 is an inner circle, 18 is a peripheral wall, 20 is an air through hole, 30 is a guide plate, 50 is an intake pipe, 501 is a first intake pipe, and 502 is a first intake pipe. Reference numeral 52 denotes a filter element, reference numeral 54 denotes a filter box, reference numeral 56 denotes a carburetor, reference numeral A denotes a main intake flow, and reference B denotes a sub-intake flow.

First, the eddy current generator 1 according to the first embodiment will be described with reference to FIGS. 1 to 3.
The eddy current generator 1 includes a vortex generator main body 10 and four guide plates 30, and the eddy current generator main body 10 includes an eddy current generator funnel portion 12 and an eddy current generator joint portion 14. . In the embodiment, the number of guide plates 30 is four, but it is sufficient that the number is at least two.

  The eddy current generator funnel portion 12 has a funnel shape that gradually increases in diameter from the proximal end portion toward the opening end, and a cylindrical eddy current generator joint portion 14 is formed at the proximal end portion of the eddy current generator funnel portion 12. The eddy current generator main body 10 is formed continuously. The outer diameter of the vortex generator joint 14 is substantially the same as the inner diameter of the cylindrical intake pipe 50. By inserting the vortex generator joint 14 into the cylindrical intake pipe 50, The vortex generator body 10 is fitted to the intake pipe 50. The vortex generator main body 10 may be fitted to the intake pipe 50 so that the inner diameter of the vortex generator joint 14 substantially matches the outer diameter of the cylindrical intake pipe 50, or the vortex generator The vortex generator joint 14 and the intake pipe 50 may be screwed together by threading a male screw on the inner peripheral surface of the joint 14 and a female screw on the inner peripheral surface of the intake pipe 50.

  The guide plate 30 is a substantially triangular flat plate, and is along a substantially tangent line from the inner peripheral edge of the open end of the vortex generator funnel portion 12 toward the inner circle 16 formed by the base end portion in the plan view of the vortex generator main body 10. Projecting on the peripheral wall 18. The tangent and the inner circle 16 have a number 6 shape as shown in FIG. 2A, and the bottom side of the guide plate 30 substantially matches the entire length of the tangent. Of course, the shape of the guide plate 30 is not limited to a triangle, and may be a rectangle, a trapezoid, a semicircle, or the like.

Here, the operation of the vortex generator 1 will be described.
When the vortex generator 1 is fitted to the intake pipe 50 and an internal combustion engine (not shown) is operated, the intake pipe 50 sucks air.

  The sucked air becomes a main intake flow A and is sucked into the intake pipe 50 through the vortex generator 1, and a negative pressure is generated around the main intake flow A, and the main intake air is generated by this negative pressure. Air around the flow A is also sucked into the intake pipe 50 so as to be drawn along the peripheral wall 18 of the funnel-shaped vortex generator body 10. When the air around the main intake flow A is sucked into the intake pipe 50, the air is swirled by the plurality of guide plates 30, 30,... Projecting from the peripheral wall 18 of the vortex generator main body 10. A secondary intake air flow B (left-handed vortex in the embodiment) is generated. Due to this spiral sub-intake flow B, turbulence generated by the techniques disclosed in Japanese Utility Model Laid-Open Nos. 5-24941 and 2000-18108 is generated at the connection between the vortex generator 1 and the intake pipe 50. Therefore, the air is sucked into the intake pipe 50 smoothly, and the inside of the intake pipe 50 is sent to an internal combustion engine (not shown).

FIG. 3 is a diagram showing an example of the state of attachment of the eddy current generator 1. In FIG. 3, the eddy current generator 1 is installed on the downstream side of the filter element 52, and the eddy current generator body 10 is attached to the filter box. 54. Therefore, when the vortex generator 1 is also used as the filter box 54, the filter box 54 becomes unnecessary, the number of parts can be reduced, and an extra space for mounting the vortex generator 1 is not required.
Of course, the vortex generator 1 can be installed in the filter box 54 as shown in FIG.

Next, the eddy current generator 2 according to the second embodiment will be described with reference to FIGS.
The vortex generator 2 has substantially the same configuration as that of the vortex generator 1 and differs from the air through hole 20 formed in the peripheral wall 18 of the vortex generator body 10. A configuration different from the device 1 will be described.

  The eddy current generator 2 is composed of the eddy current generator main body 10 and the four guide plates 30, and the eddy current generator main body 10 is composed of the eddy current generator funnel portion 12 and the eddy current generator joint portion 14. Since this is the same as that of the vortex generator 1, description of the vortex generator body 10 and the guide plate 30 is omitted.

Four rectangular air through holes 20 are formed in the peripheral wall 18 between the guide plates 30 and 30 of the four vortex generator funnels 12. The air through hole 20 is formed on the right side of the numeral 6 formed by the tangent to which the bottom of the guide plate 30 is fixed and the inner circle 16, and the area of the guide plate 30 and the area of the air through hole. Are substantially identical.
In the second embodiment, the shape of the air through-hole 20 is rectangular. However, like the guide plate 30, it may be triangular, rectangular, trapezoidal or semicircular. Accordingly, a plane figure is drawn with the tangent to which the bottom side of the guide plate 30 is fixed to the peripheral wall 18 of the eddy current generator body 10 as the base, and cut along the edges of the plane figure excluding the bottom, Even if the guide plate 30 and the air through hole 20 are formed by bending at an appropriate angle inside the vortex generator main body 10 along the tangent line, the vortex generator having the same configuration and effect as in the second embodiment is obtained. Can be obtained.

  The action of the vortex generator 2 is substantially the same as that of the vortex generator 1, but since the air through hole 20 is formed, the air in the filter box 54 is not only the opening end of the vortex generator 2. Suction is also taken from the outer periphery of the vortex generator 2. For this reason, the air in the filter box 54 can be efficiently fed into the intake pipe 50 without causing air accumulation in the filter box 54.

(Usage example and effect of vortex generator 1 and vortex generator 2)
Here, the usage example and effect of the vortex generator 1 and the vortex generator 2 will be described with reference to FIG.
FIG. 7 is a conceptual diagram showing how the vortex generator 1 and the vortex generator 2 are attached.
In FIG. 7, the vortex generator 2 → the first intake pipe 501 → the filter element 52 → the vortex generator 1 → the second intake pipe 502 → the carburetor 56 are connected in order from the upstream side of the intake flow. Yes. Of course, the vortex generator 1 may be installed instead of the vortex generator 2, or the filter box 54 may be installed instead of the vortex generator 1, and the vortex generator 2 may be installed therein.

With the configuration shown in FIG. 7, a demonstration experiment was conducted in which approximately 100 kg of cargo was placed on a passenger car with a displacement of 3500 cc and a total vehicle weight of 2420 kg and traveled on a highway 104 km including approximately 20 km uphill.
As a result, when the vortex generator 2 is used in the first intake pipe 501 provided with the duct fan of the electric motor, the power consumption of the electric motor is reduced by about 20%, and the vortex generator 1 is connected to the second intake pipe. When attached to the tip of the tube 502, the fuel efficiency of the vehicle increased by about 20% at the maximum.

FIG. 1 is a perspective view of the eddy current generator according to the first embodiment. 2A and 2B are diagrams for explaining the operation of the eddy current generator according to the first embodiment. FIG. 2A is a plan view, and FIG. 2B is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a view showing how the eddy current generator according to the first embodiment is attached. FIG. 4 is a perspective view of the eddy current generator according to the second embodiment. FIGS. 5A and 5B are diagrams for explaining the operation of the eddy current generator according to the second embodiment. FIG. 5A is a plan view and FIG. 5B is a cross-sectional view taken along the line VV in FIG. FIG. 6 is a view showing an installation state of the eddy current generator according to the second embodiment. FIG. 7 is a view showing how the eddy current generators according to the first and second embodiments are attached. FIG. 8 is a diagram of an eddy current generator according to an embodiment disclosed in Japanese Utility Model Laid-Open No. 5-24941. FIG. 8A is a sectional view of the eddy current generator installed in an internal combustion engine, and FIG. ) Is a perspective view of the vortex generator. FIG. 9 is an intake device diagram of an internal combustion engine according to an embodiment disclosed in Japanese Patent Laid-Open No. 2000-18108. FIG. 9A is a front view showing the structure of the intake device of the internal combustion engine, and FIG. ) Is a cross-sectional view taken along the line IX-IX in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Eddy current generator concerning Example 1 2 Eddy current generator concerning Example 2 10 Eddy current generator main body 16 Inner circle 18 Peripheral wall 20 Air through-hole 30 Guide plate 50 Intake pipe 54 Filter box 56 Vaporizer

Claims (5)

An overflow generator connected to an upstream end of an intake pipe of an internal combustion engine and also serving as a downstream box of a filter box (54) containing a filter element (52) therein, the overflow generator body (1, 2) is The funnel shape gradually increases in diameter from the base end portion connected to the intake pipe toward the upstream opening end, and a plurality of guides are provided in substantially the same direction and at substantially equal intervals on the funnel-shaped inner peripheral surface of the overflow generator body. The plate (30) is projected along the virtual tangent line drawn on the funnel-shaped inner circumferential surface so as to contact the circumference of the inner circle formed by the base end portion from the inner circumferential edge of the upstream opening end. The guide plate extends to the position where the end of the overflow generator in the central direction extends virtually to the intake pipe in the previous overflow generator body, and the funnel-shaped peripheral wall (12) of the previous overflow generator body. An overflow generator for an internal combustion engine, wherein an air through hole (20) is formed between the guide plates. The overflow generator for an internal combustion engine according to claim 1, wherein an area of the through hole is 40% to 120% with respect to an area of the guide plate. The overflow generator for an internal combustion engine according to claim 1, wherein an area of the through hole is 70% to 100% with respect to an area of the guide plate. The funnel-shaped peripheral wall of the overflow generator body is cut along an edge of a plane figure having the tangent as a base, and the plane figure is formed at an appropriate angle inside the overflow generator body with the tangent as a fold line. The guide is cut out along the edge of the plane figure and fixed at a predetermined angle to the inner side of the vortex generator body along the tangent line. The overflow generator for an internal combustion engine according to any one of claims 1 to 3, wherein a plate and the air through hole are formed. The overflow generator for an internal combustion engine according to any one of claims 1 to 4, wherein the overflow generator body is detachable from the intake pipe.

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