RU17063U1 - EXHAUST GAS FLOW ACCELERATOR OF INTERNAL COMBUSTION ENGINE WITH EJECTOR - Google Patents

Description

ACCELERATOR OF FLOW OF EXHAUST GASS INTERNAL COMBUSTION MOTOR WITH EJECTOR.

The alleged invention relates to the automotive industry and can be used, in particular, in exhaust devices to increase engine efficiency and engine power, to save gas mileage, as well as to improve the manufacturability of the accelerator.

An exhaust device of an internal combustion engine is known in which pressure fluctuations due to processes occurring during exhaust are used to accelerate the movement of the exhaust gas stream. The device comprises an exhaust pipe, a diffuser, a cylindrical part and a return channel at the inlet of the muffler arranged in series in the direction of gas movement. These elements, arranged one after another, are combined with one another so that the direct pressure wave of the exhaust gases changes its direction 2n n - .1 times along the flow axis with the number of 2p pairs of back reflections and the number J / reflections in the direction of the gas flow. (see French Patent No. 2644510 CL F 02 B 27/04, 1990) Considered procedure for use

Pressure fluctuations in technology are called resonance or acoustic boost. It is theoretically proved that pressure fluctuations in the suction and exhaust systems have a significant impact on the operation of the engine and: nn the power it gives. Theoretically, the limit of increasing the filling factor of cylinders by the acoustic method approaches 41, which can give an average increase in power by. However, the collector of an automobile engine is a very thin dynamic, acoustic system and it is almost impossible to achieve full resonance between the amplitude and phase ratios of pressure fluctuations in the exhaust line to achieve resonance without a tracking system.

The disadvantage of the considered device due to the above reasons is the relatively low efficiency of increasing engine power and low manufacturing technology of the device.

The closest in technical essence and the achieved result is the Accelerator of the exhaust gases of an internal combustion engine with an ejector adopted as a prototype (see Patent Pi No. 2059839 IPC F 01 AG 1/08, F 02 B 27/04, publ. 10.05. 96. Bull.No 13.)

The accelerator contains an exhaust pipe connected on one side with an adapter to the exhaust system, and on the other, through a bell with an atmosphere and an accelerator block located between the adapter and the inner surface of the socket, the accelerator block being made in the form of a truncated cone mounted behind the adapter along the axis a pipeline with a vertex facing the direction of movement of the exhaust gas flow and additional channels of the secondary ejected air, and the cross section of the flow channels in the direction from the top of the cone to the end, it is transformed from triangular to trapezoidal, respectively, and triangular cross sections are obtained by dividing the area and the cross section

. 2. 12

on n sectors ().

This design provides a decrease in pressure in the mixing chamber and, accordingly, an increase in the speed of exhaust gases at the inlet of the proto-channels and the outlet of the accelerator. This leads to an increase in BKOHOI; michnosti and engine power.

An even greater effect is achieved when running flow channels with twisting them along a helix. In this case, a vortex is formed from the swirl of the exhaust gas flow, which significantly increases the negative pressure and, accordingly, the outlet velocity of the gases, which in turn enhances the ejection of atmospheric air.

With all the considered positive qualities, this patent has several disadvantages. The main one is technological d: the complexity of manufacturing the accelerator block, due to the need to perform additional channels of the secondary ejected air, in which the cross section of the side channels in the direction from the top of the cone to the end is transformed from triangular to trapezoidal, respectively, and triangular sections are obtained by dividing the cross-sectional area sections on n sectors (n 2). The ejector is formed by an annular profile gap between the inner surface of the socket in the place of its interface with the end of the cone and the external surfaces of the flow channels and additional channels of the secondary ejected air, and the area and the cross sections of the additional channels in the direction from the end of the cone to its apex are made decreasing to zero . All this makes the accelerator manufacturing technology very complicated.

The aim of this invention is to increase the manufacturability of the manufacture of the accelerator due to the simplification of the design.

The goal is achieved by the fact that in the accelerator of the exhaust gas flow of an internal combustion engine with an ejector containing an exhaust pipe connected on one side by an adapter with

 3 "

the outlet cHCTeMoip, on the other, through the socket with the atmosphere and the accelerator block located between the adapter and the inner surface of the socket, the outlet section of the socket made in the form of a Laval nozzle, the accelerator block made in the form of a faceted cone mounted behind the adapter coaxially with the exhaust pipe, on the external side of the cone made flow channels in the form of a set of thin-walled tubes of small diameter at the base resting on the edges of the cone, and in the upper part - on the socket, while the axis of the flow channel they are relative to the axis of the exhaust pipe at an angle of more than 15 °., and the shape of thin-walled tubes of small diameter may differ from a straight-through cylindrical

Conducted patent research, as well as a comparative analysis of the inventive accelerator with the prototype allows us to conclude that the set of essential features given in the utility model formula is not known from the level of automotive technology. Therefore, the claimed device accelerator flow of exhaust gases of an internal combustion engine with an ejector meets the criterion

 novelty

The accelerator is industrially applicable, because can be used in the automotive industry: more precisely in exhaust devices, using a simpler technology compared to the prototype.

Figure 1 shows the design of the accelerator of the exhaust gas flow of an internal combustion engine with an ejector for a particular case with three flow channels; figure 2 - section a - a with three flow channels with a swivel angle of more than 15 °; in Fig 3 - SECV - In at the place of its connection with the adapter; figure 4 (a, b) shows the shape of thin-walled tubes that differs from a straight-through cylindrical tube, for example, a - in VI, 1; e of a truncated cone, b "spiral. The numbers in the figures indicate:

.4. LGM) Jt ()

I - raetrub, 2 - cone, 3 - flow channels, 4 - profile insert, 5 - adapter, b - ejector, 7 - vehicle exhaust pipe, 8 thin-walled tubes of small diameter, 9 - chamber for mixing exhaust gas flows and ejected atmospheric air.

The bell I is made in the form of a truncated cone with a small angle of narrowing / towards the outlet of the exhaust gas stream. The input edge of the bell I is bent outward with a ra, 1, a rounding radius sufficient to form an input collector. At the outlet of the socket I, a profile insert 4 is placed, for example, having a triangular nonepetjHoe casing forming a Laval nozzle C (Fig. 1).

The cone 2 is made faceted (figure 2). This design is simpler and more technologically advanced than that of the prototype. In this case, it is convenient to place and fix flow channels on the edges of the cone.

The flow channels 3 are formed by thin-walled tubes of small diameter 8. The use of tubes provides the formation of flow channels of any shape. In this case, the shape of the tubes may differ from straight-through cylindrical and may be, for example, conical or spiral, bottom. The ejector is formed by an annular profile gap between the inner surface of the socket I and the outer surfaces of the flow channels 3, formed by the outer surfaces of the thin-walled tubes 8 and the gaps between and in them.

The exhaust gas accelerator of the internal combustion engine with an ejector operates as follows.

The exhaust gases of the engine enter the flow channels 3 through thin-walled tubes 8 (section B - B of FIG. 3) and upon exiting them, i.e. at the entrance to the mixing chamber 9 (in section A - A of FIG. 2), atmospheric air is taken along through the annular profile slit and the slots between the tubes 8, forming an ejector b.

- 5 pressure is maintained by the flow of exhaust gases and, in addition to the tinned air, when the car moves in proportion to its

speed. All this helps to accelerate the flow of exhaust gases. For the same purpose, the bell I is made in the form of a truncated cone with a malm narrowing angle in the direction of the gas flow and a profile insert 4, which creates regions of expansion and expansion, forming a Laval nozzle. The value of the narrowing of the bell I is selected experimentally by changing the dimensions of the profile branch 4. In this case the angle of narrowing of the socket should not exceed 7 ° (in FIG. this is angle A).

The execution of thin-walled tubes 8 in the form of a truncated cone (Fig. 4 - a) is even more effective, with the apex of the cone being directed along the gas movement. The narrowing of the channels leads to an increase in the rate of entry of exhaust gases into the ejector, or rather, into the mixing chamber. In this case, the negative pressure and, accordingly, the outlet velocity of the gases significantly increase, which in turn enhances the ejection of atmospheric air. The same thing happens with the spiral shape of the tubes (Fig.4 - b).

As you know from theory, lowering the pressure at the outlet of the exhaust pipe leads to increased efficiency and engine power. In addition, due to more complete combustion of the fuel in the cylinder, the percentage of CO decreases

Thus, all the advantages of the prototype are preserved with a significant simplification of the design of the flow channels 3 and the technology of their manufacture.

A set of thin-walled tubes with the ability to change their shape when forming flow channels makes it easy to switch to different modifications of the accelerator design without complicating the technology.

All this proves the achievement of the goal.

- 6

Claims (3)

1. The accelerator of the exhaust gas flow of an internal combustion engine with an ejector, containing an exhaust pipe connected on one side with an adapter to the exhaust system, and on the other through a socket - with the atmosphere, and an accelerator block located between the adapter and the inner surface of the socket, and the output the cross-section of the bell is made in the form of a Laval nozzle, characterized in that the accelerator block is made in the form of a faceted cone, mounted behind the adapter coaxially with the exhaust pipe, on the outside The cone has flow channels in the form of a set of thin-walled tubes of small diameter at the base resting on the edges of the cone, and in the upper part, on the bell. 2. The accelerator according to claim 1, characterized in that the axis of the flow channels are deflected relative to the axis of the exhaust pipe by an angle of more than 15 ^o . 3. The accelerator according to claim 1, characterized in that the shape of the thin-walled tubes of small diameter may differ from the straight-through cylindrical.