Contemporary devices for draining exhaust gases from combustion engine exhaust pipes use simple sockets positioned in the middle or along the sides of the exhaust pipe. Attention is usually concentrated on the problem of regulating the quantity of the gases discharged, dependent on the momentarily- detected composition of exhaust gases, while not resolving the effectiveness of the collection of the exhaust gases itself. A contemporary device for re-circulating exhaust gases reached a re-circulation rate of at most 50 of the volume of gases emerging from a combustion engine. Patent record no. CZ 278864 shows us a device for discharging exhaust gases from exhaust pipes by means of a streamlined body with a leading edge and an outlet section installed inside the exhaust pipe, extending its outlet section into the socket of the collector, which faces into the exhaust flow and is linked to discharging pipes for the discharging of exhaust gases into the intake pipes of a combustion engine. The goal of this device is to collect those exhaust gases, which are flowing along the surface of the outlet section and use them for further processing either through combustion or by adding them to the combustion engine's intake pipes. Because of the diffusion effect which occurs in the outlet section, exhaust gases on the surface of the outlet section have a different composition than those in the streamlines further away from the surface, especially a higher concentration of carbon monoxide, water and unburned hydrocarbon. By then burning the exhaust gases thus discharged in the combustion engine or in a separate combustion device, an overall reduction of undesirable components is achieved in the exhaust gases emerging from the exhaust pipes. This device carries out a qualitative selection of those exhaust gases generated and flowing by means of the diffusion effect along the surface of the streamlined body's outlet section. From the dividing line between the leading and outlet sections of the body the flow speed along the surface of the streamlined body drops severely until at the edge of the outlet section it equals the flow speed behind the streamlined body. The quantity of exhaust gases collected by the socket at the outlet section of the streamlined body is not significantly larger than any other similarly sized cross-section sampled at a greater distance from the streamlined body. The purpose of this device is therefore restricted to the required separation of the components of exhaust gases, especially carbon monoxide, water and unburned hydrocarbon and does not contribute much to solving the problem of the quantity of exhaust gases collected.

The goal of the invention is to eliminate the disadvantages of the current technological state and to provide a device for discharging part of the exhaust gases from the exhaust pipe of a combustion motor by means of a return pipe for mixing the discharged gases with the intake mix. This would enhance by a technically simple and price competitive means the effectiveness of filling the return pipe with exhaust gases, and would thus influence the composition of the emerging exhaust gases in such a way as to reduce the amount of undesirable components. A further goal of the invention is to secure easy manufacturability of the device in question and simple installation on vehicles without an exhaust gas catalysator.

Disadvantages of the state of art are eliminated to a large extent and the aim of the invention fulfilled by a device for discharging flowing gases from pipes, particularly exhaust gases from exhaust pipe to a combustion engine by means of a return pipe, said device consisting of a streamlined body arranged at least by its part in a collector placed in the exhaust pipe facing with its open socket against the exhaust flow and linked to the return pipe, whereas the streamlined body equipped with its leading edge facing against the exhaust flow and the surface of the streamlined body having a compression and an expansion area of the streamlines of the medium flowing around the streamlined body according to the invention the nature of which consists in that the streamlined body protrudes from the opening of the socket of the collector into the area of compressed streamlines of the medium flowing around the surface of the streamlined body, whereas the opening of the socket of the collector is filled with only these compressed streamlines of the flowing medium. According to an advantageous execution of the invention, the streamlined body can put its leading edge through the intake of the collector socket, the socket can form a cover for at least section of the leading section of the streamlined body, the collector can be installed in the conducting channel linked to the exhaust pipe by its intake and including the inflow section, the internal profile of which passes from the intake to the perpendicular slot on the longitudinal axis of the conducting channel, where the streamlined body is installed with its leading edge opposite the slot. The inflow section can be linked to the outflow section, the internal profile of which passes from the slot to the outlet of the conducting channel, where the outflow section forms a cover for at least part of the leading section of the streamlined body protruding from the socket intake. The size of the flow opening for the flowing medium in the conducting channel can be constant, at least between the intake of the conducting channel and the socket intake. The collector can be connected in the direction of flow to the combustion engine'sintake pipes by means of the return pipe, and placed behind the mixing device which prepares the combustion mix. The slot can benefit from a longitudinal shape and the streamlined body can have a winged profile, where the body's leading edge lies parallel to the longitudinal slot or lies in the longitudinal slot, or the slot can be circular in shape with the streamlined body of rotary shape, where the leading edge is parallel with the longitudinal slot or lies in the longitudinal slot. Under other beneficial setups of the device, with the invention formed with a longitudinal slot shape and a wing- shaped streamlined body, the collector can have two rear outlets, linked to the return pipe by its arms, where one arm of the pipe can be led to the return pipe along one side of the outflow section of the conducting channel, while the second arm is led to it alongside the other side of the outflow section of the conducting channel and crosses over or under the inflow section of the conducting channel. The conducting channel can be placed in a case which has a front panel with an opening to link the exhaust pipe to the intake of the conducting channel and a further opening for the return pipe to pass through. The rear panel has an opening to link the conducting channel's outlet to the exhaust pipe. The advantage of the device for the discharging of flowing gases from pipes is that it is considerably more effective at filling the return pipe with exhaust gases up to 200, depending on the specific application.

In conjunction with the leading of discharged exhaust gases into the intake pipes of the combustion engine, the invention decreases the content of undesirable exhaust gas components emerging from the exhaust pipe. The invented device for discharging flowing gases from pipes can be easily produced at low cost as an integral piece, the installation of which on motor vehicles is quick and easy and does not require any extra changes to either the exhaust or the intake pipes. The invented device for discharging flowing gases from pipes can be installed on vehicles without an exhaust-gas catalysator in the same way as on vehicles with a catalysator, where the effects of the catalysator and the use of the invented device reinforce one another. The catalysator is thus considerably spared and its service life fundamentally prolonged.

The invented device for discharging flowing gases from pipes is explained in more detail with the help of the diagrams, where Fig. l shows the device installed in the exhaust pipe, in a partly vertical cross-section along the longitudinal axis of the streamlined body, Fig. 2 the device installed in the conducting channel and the case, in a side-angle view vertical cross-section along the longitudinal axis of the streamlined body, Fig. 3 another application of the device installed in an accelerating channel and in a case, as viewed from above in a vertical cross-section along the longitudinal axis of the streamlined body, Fig. 4 the device as in Fig. 3, with a case, viewed from the side in a vertical section cross-section along the longitudinal axis of the streamlined body, and Fig. 5 the device as in Fig. 3 as seen from the point of view of arrow A as indicated in Fig. 3.

As shown in Fig. l, inside the exhaust pipe 1 is placed the collector 2 with the socket 3 opening into the direction of exhaust flow as shown by arrow 4. The streamlined body 5 protrudes with its socket 3 into the collector 2, the body's leading edge 6 is installed in the opposite direction of the flow of the exhaust gases, and the leading section 7 passes along the transitional line 8 to the outflow section 9.

Generally speaking, the surface of the streamlined body 5 shows the area of compression and the area of expansion of the streamlines of the flowing medium. Compression of the streamlines of flowing medium takes place at the surface of the streamlined body 5 in the area where the crosscut (perpendicular to the axis of flow) of the streamlined body 5 widens. In the area of streamline compression, the flowing medium increases in speed at the surface of the streamlined body 5. In the area where the crosscut (perpendicular to the axis of flow) of the streamlined body 5 narrows, the streamlines of flowing medium break down and the speed of flow at the surface of the streamlined body 5 decreases. The streamlined body 5 protrudes into the socket 3 of the collector 2 in such a manner that the socket 3 is completely filled up by compressed streamlines of flowing gas medium. In the sample application, the socket 3 in essence goes through the middle part of the leading section 7, while the collector 2 creates a cover for the part of the leading section 7, which protrudes from the socket 3. The leading section 7 forms an angle with the longitudinal axis 10 of the streamlined body 5 at an inclined angle a with an advantage of 20DL. By increasing the inclined angle a, the speed of exhaust gas flow around the streamlined body 5 is increased. At the inclined angle given, laminar flow is maintained in the area where the leading section 7 emerges from the socket 3 of the collector 2 which causes a compression of the streamlines of exhaust gases. It is desirable that turbulent flow does not arise in the leading section. The side openings 11 of the collector's 2 final section are linked to the return pipe 12. The return pipe 12 is linked in the example application to the intake pipe 13 in the area after the mixing device 14 for the preparation of the mix for the combustion engine 15. For combustion engines with fuel injection into the intake pipe 13, it is possible to connect the return pipe 12 after the injection jet. In the case of fuel injected directly into the combustion cylinder, it is necessary to connect the return pipe 12 before the intake valve of the combustion engine 15. Tests have shown that the speed of those exhaust gases directed to the combustion engine, indicated by arrow 4a, is higher than the speed of those exhaust gases, shown here by arrow 4b, which emerge from the exhaust pipe 1.

In Fig. 2, the collector 2 is installed in the conducting channel 16, which has thrust its intake 17 and outlet 18 into the exhaust pipe 1 and is thus created by both the inflow section 19, the internal profile of which passes from the intake 17 to the longitudinal slot 20, placed across the axis 10 and parallel to the leading edge 6 of the streamlined body 5, and by the outflow section 21, the internal profile of which passes from the slot 20 to the outlet 18 of the conducting channel 16. The streamlined body 5, protruding into the collector 2, aims its leading edge 6 against the inflow section 19. The collector 2 creates a cover for part of the leading section 7 of the streamlined body 5, which extends from the socket 3. In the sample application the leading edge 6 of the streamlined body 5 lies in the slot 20. The slot 20 has an advantageous longitudinal shape, in the example the shape of a rectangle. The leading edge 6 of the streamlined body 5 lies beneficially in the slot 20, though horizontally conducted along the axis of symmetry. The outflow section 21 of the conducting channel 16 is by its shape adapted to the shape of the streamlined body 5 and the collector 2 and creates a cover for them. The conducting channel 16 is placed in a case 22, which has a front panel 23 with an opening 24 to link the exhaust pipe 1 to the intake 17 of the conducting channel 16 and a rear panel 25 with an opening 26 to link the outlet 18 of the conducting channel 16 to the exhaust pipe 1. The schematically represented return pipe 12, which passes through the openings 27 of the side walls of the case 22, links the end section of the collector 2 to the two side openings 11. The size of the flow opening of the inflow section 19, the slot 20, and the flow openings between the leading section 7 of the streamlined body 5 and the outflow section 21 remain unchanged, only the shape of the flow opening changes. The sum of the flow opening between the collector 2 and the outflow section 21 is the same as the flow opening between the collector 2 and the leading section 7 of the streamlined body 5. The sum of the flow opening of the return pipe 12 and its arms 12a and the exhaust pipe 1 are also the same size. These flowopening measurements are chosen in order to attain a uniform flow of exhaust gases and to prevent undesirable impacts in the pipes.

Adapting the invented device is a simple matter for the average professional in the field. The internal profile of the inflow section 19 basically changes from a circular profile at the intake 17 into the rectangular profile of the slot 20, which in essence is transferred into the rectangular profile of the outflow section 21, where the internal profile changes once again to the circular profile of the conducting channel's 16 outflow 18. The specific placement of the streamlined body 5 in the collector 2 is chosen in accordance with the need to maintain laminar flow at the surface of the streamlined body 5.

The placement of the streamlined body 5 in the conducting channel 16 and its placement in the case 22 is carried out in an unillustrated but known manner. The purpose of the conducting channel 16 is to influence the speed of flow in the slot's flow opening so as to effectively and to a high degree fill the opening 30 of the socket 3 of the collector 2 with exhaust gases, in order to drain them by means of the return pipe 12 back into the combustion engine. Tests have shown that the speed of those exhaust gases discharged back to the combustion engine's intake is higher than the speed of those exhaust gases coming out of the outflow 18 of the conducting channel 16 into the exhaust pipe 1. Without damages to the device, as shown in Fig. 2, the streamlined body S, the inflow section 19, the outflow section 21 and the collector 2 can be of rotary shape. In Fig. 3. and Fig. 4 we can see a beneficial installation of a device placed in a case 22 with the variation of linking the collector 2 to the return pipe 12. The two arms 12a, 12b feed into the return pipe 12 while passing through the side openings 28a and 28b in the back part of the outflow section 21 of the conducting channel 16 and are linked to two rear outlets 29a, 29b of the collector 2. The front panel 23 of the case 22 has both an opening 24 for linking the exhaust pipe 1 to the intake 27 of the conducting channel 16 and another opening 30 for the return pipe 12. One of the arms 12a leads to the return pipe 12 along one side of the outflow section 21, whilst the second arm 12b leads to it along the other side of the outflow section 21 of the conducting channel 16 and across obliquely over or under the inflow section 19. In Fig. 5 is the front panel 23 of the case 22 with the opening 24, in which sections of the device are visible inside the conducting channel 16, these being the leading edge 6, the streamlined body 5, the inside wall of the inflow section 19, and the slot 20. In the opening 30 of the panel 23 the arms 12a, 12b of the return pipe 12 are marked. The oval-shaped case 22 with the beneficially placed installation of the device creates an installation unit, which can be easily incorporated into the exhaust pipe 1.