阅读说明：本技术 用于分离和排放冷凝物的流动通道 (Flow channel for separating and discharging condensate ) 是由 A·库斯克 V·斯米利亚诺夫斯基 J·克默林 F·A·萨默候夫 H·M·金德尔 H·弗里德 于 2020-01-15 设计创作，主要内容包括：本发明涉及用于分离和排放冷凝物的流动通道。描述了一种流动通道(1),其具有内表面(5)、入口(2)和出口(3),其中入口(2)被设计成与排气再循环流动通道流体连接,并且出口(3)被设计成与压缩机(20)的入口流体连接。入口(2)包括中心轴线(4),并且至少一个涡流发生器(6)被布置在入口(2)的下游和出口(3)的上游,涡流发生器(6)在径向方向(16)上可移动。沿着出口(3)的周边延伸的捕获槽(8)被布置在出口(3)的上游和至少一个涡流发生器(6)的下游,捕获槽由流动通道(1)的内表面(5)径向向外限定,在轴向方向上由捕获边缘(9)限定,并且由在周向方向上与内表面(5)以一定间距延伸的边缘(10)径向向内限定,其中捕获槽(8)与流出设备(12)流体连接。(The invention relates to a flow channel for separating and discharging condensate. A flow channel (1) is described having an inner surface (5), an inlet (2) and an outlet (3), wherein the inlet (2) is designed to be in fluid connection with an exhaust gas recirculation flow channel and the outlet (3) is designed to be in fluid connection with an inlet of a compressor (20). The inlet (2) comprises a central axis (4) and at least one vortex generator (6) is arranged downstream of the inlet (2) and upstream of the outlet (3), the vortex generator (6) being movable in a radial direction (16). A catching groove (8) extending along the periphery of the outlet (3) is arranged upstream of the outlet (3) and downstream of the at least one vortex generator (6), the catching groove being defined radially outwards by an inner surface (5) of the flow channel (1), by a catching edge (9) in the axial direction and radially inwards by an edge (10) extending at a distance from the inner surface (5) in the circumferential direction, wherein the catching groove (8) is in fluid connection with an outflow device (12).)

1. A flow channel (1) having an inner surface (5), an inlet (2) and an outlet (3), wherein the inlet (2) is designed to be in fluid connection with an exhaust gas recirculation flow channel and the outlet (3) is designed to be in fluid connection with an inlet of a compressor (20),

the inlet (2) comprises a central axis (4) and at least one vortex generator (6) is arranged downstream of the inlet (2) and upstream of the outlet (3), the at least one vortex generator (6) being movable in a radial direction (16) and a capturing groove (8) extending along the periphery of the outlet (3) is arranged upstream of the outlet (3) and downstream of the at least one vortex generator (6), the capturing groove being defined radially outwards by the inner surface (5) of the flow channel (1), radially inwards by a capturing edge (9) in an axial direction and by an edge (10) extending at a distance from the inner surface (5) in a circumferential direction, wherein the capturing groove (8) is in fluid connection with an outflow device (12).

2. The flow channel (1) according to claim 1, characterized in that the at least one vortex generator (6) is movable in the radial direction (16) to a position where it ends at the inner surface (5) of the flow channel (1).

3. The flow channel (1) according to claim 1 or 2, characterized in that the catch tank (8) comprises a condensate collector (11) for collecting condensate, which condensate collector (11) is connected to the outflow device (12).

4. The flow channel (1) according to any one of claims 1 to 3, characterized in that the flow channel (1) comprises at least one outer wall (15) configured to be coolable.

5. The flow channel (1) according to any one of claims 1 to 4, characterized in that the at least one vortex generator (6) is configured in the form of a ring.

6. The flow channel (1) according to any one of claims 1 to 5, characterized in that the inlet (2) comprises a three-way exhaust gas recirculation valve and/or a low pressure exhaust gas recirculation combination valve, or the inlet (2) is fluidly connected with a three-way exhaust gas recirculation valve and/or a low pressure exhaust gas recirculation combination valve.

7. A compressor (20) comprising an inlet, characterized in that a flow channel (1) according to any one of claims 1-6 is arranged at the inlet.

8. A turbocharger (22), characterized in that it comprises a compressor (20) according to the preceding claim.

9. An exhaust gas recirculation arrangement (27) comprising an outlet, characterized in that a flow channel (1) according to any of claims 1-6 is arranged at the outlet.

10. Exhaust gas recirculation arrangement (27) according to the preceding claim, characterized in that it is designed as a low-pressure exhaust gas recirculation arrangement.

11. A method for operating an exhaust gas recirculation arrangement (27) according to claim 9 or 10, characterized in that the method comprises the steps of:

-moving (16) the at least one vortex generator (6) inwards in a radial direction into the flow channel (1) if exhaust gas is recirculated, such that the vortex generator (6) protrudes into the flow channel (1),

-if exhaust gases are not recirculated, moving (16) the at least one vortex generator (6) outwards in a radial direction at least to the inner surface (5) of the flow channel (1).

12. Method according to claim 11, characterized in that if exhaust gases are not recirculated, the at least one vortex generator (6) is moved (16) outwards in a radial direction so that the vortex generator (6) ends at the inner surface (5) of the flow channel (1).

13. A motor vehicle (25) comprising an exhaust gas recirculation arrangement (27) according to claim 9 or 10 and/or a compressor (20) according to claim 7 and/or a turbocharger (22) according to claim 8.

Technical Field

The present invention relates to a flow passage, particularly for use in conjunction with an exhaust gas recirculation flow passage and a compressor. Furthermore, the invention relates to a compressor, a turbocharger, an exhaust gas recirculation arrangement, a method for operating an exhaust gas recirculation arrangement and a motor vehicle.

Background

In order to meet the emission limit requirements of the exhaust gas, exhaust gas recirculation is commonly performed, particularly in conjunction with various exhaust aftertreatment procedures, such as selective catalytic reduction using lean NOx traps and catalytic converters. In this case, a high specific humidity (high specific humidity) in the exhaust gas causes a large amount of condensate to be formed when the exhaust gas is cooled. Especially in applications featuring low pressure exhaust gas recirculation, there is a risk that condensate will reach the compressor. In this case, the effect of condensate droplets on the compressor blades may cause damage to the compressor wheel due to shear forces.

Therefore, preventing condensate formation or draining condensate from the circulating exhaust is important and also presents challenges. In document US 6,748,741, a method of collecting charge air condensate in connection with an exhaust gas recirculation system is described. For this purpose, an annular lip with an annular reservoir and an outflow device is arranged in the flow channel. Another variant for capturing the condensate water produced upon cooling of the recirculated exhaust gas is described in document JP6370147B2, in which a condensate water absorber is used.

Against the background described, it is an object of the invention to provide an advantageous flow channel which is used with an exhaust gas recirculation system and which is arranged upstream of a compressor, in particular which can remove and remove condensate from the gas supplied to the compressor (i.e. for example recirculated exhaust gas, charge air or an exhaust gas/air mixture). Further objects are to provide an advantageous compressor, an advantageous turbocharger, an exhaust gas recirculation device, a method for operating an exhaust gas recirculation device, and a motor vehicle.

Disclosure of Invention

The object is achieved by a flow channel according to claim 1, a compressor according to claim 7, a turbocharger according to claim 8, an exhaust gas recirculation arrangement according to claim 9, a method for operating an exhaust gas recirculation arrangement according to claim 11 and by a motor vehicle according to claim 13. The dependent claims contain further advantageous configurations of the invention.

The flow channel according to the invention comprises an inner surface, an inlet and an outlet. In this case, the inlet is designed to be in fluid connection with the exhaust gas recirculation flow channel. The outlet is designed to be in fluid connection with the inlet of the compressor. The inlet includes a central axis. At least one vortex generator is arranged downstream of the inlet and upstream of the outlet. At least one vortex generator is movable in the radial direction, i.e. in other words is designed to control or vary the cross section or flow cross section of the flow channel in the inlet region. A catch groove extending along the periphery of the outlet is arranged upstream of the outlet and downstream of the at least one vortex generator. The depth of the catching groove preferably extends in the axial direction. The capture groove is defined radially outwardly by an inner surface of the flow channel, defined by a capture edge in an axial direction, and defined radially inwardly by an edge (e.g., a circumferential band) extending at a spacing from the inner surface in a circumferential direction. The capture tank is fluidly connected to an outflow facility or outlet. In other words, the outflow device is designed to discharge liquid, in particular condensed water.

The outflow device connected to the catch basin is preferably arranged at the deepest point of its geodetical line (geodetical). The catch basin is configured in a channel along the periphery of the flow channel and guides the condensed water to the outflow device.

The advantage of the invention is that, due to the at least one vortex generator in combination with a condensate capture device arranged downstream of said vortex generator, condensate present in the gas guided through the flow channel (for example recirculated exhaust gas or exhaust gas/air mixture) can be effectively separated and drained off. By means of the at least one vortex generator, the liquid contained in the gas is guided to the inner surface of the flow channel by the centrifugal force due to the formation of the vortex. The condensate film formed on the inner surface of the flow channel, which facilitates its formation, in particular by the temperature of the flow channel walls being below the dew point of water, is then collected in a catch tank and discharged via an outflow device.

In an advantageous variant, the at least one vortex generator is movable in the radial direction to a position in which it ends at the inner surface of the flow channel. The advantage of this variant is that the vortex generator can be implemented for generating vortices depending on the operating conditions on the one hand, and on the other hand, if the use of a vortex generator is not required, the flow through the flow channel is not impeded. In other words, for example in the case of exhaust gas recirculation, vortex generators can be pushed radially into the flow channel, wherein the vortices are generated by the vortex generators (vortex generators) which have guide blades for this purpose. The centrifugal force generated causes transport of the condensate droplets towards the outer wall and further into the annular channel. If the exhaust gas is not recirculated, i.e. for example only charge air is guided through the flow channel, the at least one vortex generator can be pushed or pulled out of the flow channel in the radial direction, so that the cross section of the flow channel is not reduced. In this case, it is particularly advantageous if the vortex generator ends in such a "parked position" at the inner surface of the flow channel, since in this case an undesired influence on the flow characteristics is prevented by a possible recess in the inner surface of the flow channel.

In another variant, the catch tank may comprise a condensate collector or condensate collection tank, for example in the form of a depression in the catch tank, for collecting condensate, which condensate collector or condensate collection tank is connected to the outflow device. This has the advantage that also large amounts of condensate can be discharged efficiently via the outflow device.

The flow channel advantageously comprises at least one wall which is configured to be coolable. For example, at least one wall of the flow channel may be connected to a cooling device, such as a heat exchanger. In this case, the entire wall and thus the inner surface of the flow channel may preferably be configured to be coolable, and as a result of the cooling, the formation of condensate on the inner surface of the flow channel may be promoted.

The at least one vortex generator may be configured in the form of a ring. This configuration promotes efficient vortex formation over the entire flow cross section.

The flow passage may have an inner diameter and a length, wherein the length is at least twice the inner diameter. The at least one vortex generator is preferably arranged at a distance from the outlet of the flow channel which is at least twice the size of the inner diameter of the flow channel. For example, in the case of a net inner diameter of 50mm at the compressor inlet, an inner diameter of 30mm for the vortex generator is advantageous. The length in the direction of flow may be, for example, 5 to 15 mm, due to the guide vanes located in the ring.

In another variation, the inlet may include a three-way exhaust gas recirculation valve and/or a low pressure exhaust gas recirculation combination valve. An alternative to this variant is that the inlet may be fluidly connected to a three-way exhaust gas recirculation valve and/or a low pressure exhaust gas recirculation combination valve. In this case, control of the three-way egr valve or the low pressure egr combiner valve may be fluidly connected with control of the radial position of the vortex generator. Thus, the radial position of the at least one vortex generator may be controlled in dependence of the valve position.

As a result of the invention, the risk of damaging a compressor arranged downstream of the flow channel is at least reduced. In particular, in connection with low-pressure exhaust gas recirculation systems, condensate can be separated and subsequently discharged via the vortex generators by means of active centrifugal forces, which condensate forms on the one hand as a result of the recirculated exhaust gas being cooled via the relatively low temperature of the supplied and mixed charge air or on the other hand as a result of the recirculated exhaust gas being cooled via contact with the relatively cold portions of the flow channels used. In order to drain a maximum amount of condensate, the size of the flow channel may be tailored, in particular depending on the position and size of the at least one vortex generator and the catch basin and the outflow device. Furthermore, low pressure exhaust gas recirculation may be applied in a wider range of applications as a result of the present invention. Further, a throttle limit (choke limit) of the turbocharger disposed downstream of the flow passage may be extended.

The compressor according to the invention comprises an inlet at which the aforementioned flow channel according to the invention is arranged. The turbocharger according to the invention comprises the aforementioned compressor according to the invention. The compressor according to the invention and the turbocharger according to the invention have the advantages described above. They can also be used in the case of recirculated exhaust gases with high moisture content or low temperatures, in particular in connection with low-pressure exhaust gas recirculation.

The exhaust gas recirculation device according to the invention comprises an outlet at which the flow channel according to the invention as described above is arranged. The exhaust gas recirculation device is preferably designed as a low-pressure exhaust gas recirculation device. The exhaust gas recirculation device according to the invention has the advantages already mentioned above. Furthermore, the exhaust gas recirculation device according to the present invention may include the above-described compressor and/or the above-described turbocharger.

The method according to the invention for operating the aforementioned exhaust gas recirculation device comprises the following steps: if the exhaust gas is recirculated, the at least one vortex generator is moved inward in the radial direction into the flow channel, so that the vortex generator projects into the flow channel. If the exhaust gas is not recirculated, the at least one vortex generator is moved in the radial direction outwards at least as far as the inner surface of the flow channel, i.e. such that the vortex generator does not project at least into the flow channel. If the exhaust gas is not recirculated, the at least one vortex generator is advantageously moved outwards in the radial direction such that it ends at the inner surface of the flow channel. The advantages with which the method according to the invention has been proposed above. In particular, this enables the implementation of the vortex generator to be adapted to the respective operating conditions in connection with the discharge of the condensate formed.

The motor vehicle according to the invention comprises the aforementioned exhaust gas recirculation device and/or compressor according to the invention, and/or the turbocharger according to the invention. The advantages that motor vehicles have been proposed above. The motor vehicle may be a car, truck, bus, mini-bus or motorcycle.

Drawings

Fig. 1 is a schematic longitudinal cross-section of a flow channel according to the present invention.

Fig. 2 is a schematic view of a flow channel according to the invention in a cross-section along II-II shown in fig. 1.

Fig. 3 is a schematic view of a motor vehicle according to the invention.

List of reference numerals

1 flow channel

2 inlet

3 outlet port

4 central axis

5 inner surface

6 vortex generator

7 movement of the liquid droplet

8 catch groove

9 catching edge

10 edge of

11 condensate collector

12-outflow device

13 direction of flow

14 direction of flow

15 outer wall

16 capability of movement in radial direction

17 condensate film

20 compressor

21 compressor impeller

22 turbo charger

23 space apart

24 inner diameter

25 Motor vehicle

26 space apart

27 exhaust gas recirculation device

Detailed Description

The flow channel 1 according to the invention shown in fig. 1 and 2 comprises an inlet 2, an outlet 3 and a central axis 4. In the shown variant, the central axis 4 is both the central axis of the inlet 2 and the outlet 3. In the alternative of the shown variant, the central axes of the inlet 2 and the outlet 3 may also deviate from each other, so that the flow channel 1 may also have one or more bends. The flow channel 1 according to the invention further comprises an inner surface 5 and an outer wall 15.

At least one vortex generator 6 is arranged downstream of the inlet 2 and upstream of the outlet 3. For example, the at least one vortex generator 6 may be arranged directly at the inlet 2 or at a distance 26, the distance 26 being less than one third of the length of the flow channel 1. At least one vortex generator 6 is displaceable in the radial direction. This is indicated by arrow 16. Thus, the at least one vortex generator 6 may be pushed radially inwards into the flow channel 1 such that it protrudes inwards in a radial direction beyond the inner surface 5. Furthermore, the at least one vortex generator 6 can be moved outwards in the radial direction 16, at least as far as the inner surface of the flow channel 1, in particular at least as far as it ends at the inner surface 5, i.e. does not protrude into the flow channel 1.

By means of the at least one vortex generator 6, a vortex is formed in the gas flowing through the flow channel 1, wherein droplets contained in the gas (e.g. in the circulating exhaust gas) are forced radially outwards by the centrifugal force acting thereon as a result of the vortex formation and are thus guided to the inner surface 5. This is indicated by arrow 7. The flow direction of the gas entering the flow channel 1 through the inlet 2 is indicated by reference numeral 14. The condensate guided by the centrifugal force to the inner surface 5 forms a condensate film 17 and subsequently flows in the direction of the outlet 3 due to the fluid in the flow channel 1.

The outer wall 15 of the flow channel 1 may preferably be cooled, i.e. for example provided with a cooling device. Thus, condensate formation is promoted, enabling more efficient separation and drainage of condensate or liquid.

A catch groove 8 extending along the periphery of the flow channel 1 (e.g. along the periphery of the outlet 3) is arranged upstream of the outlet 3 and downstream of the at least one vortex generator 6. In this case, the catch groove 8 extends over its depth in the axial direction (for example the flow direction 14). The catch groove 8 is defined radially outwardly of the inner surface 5 of the flow channel. In the axial direction 4 or in the flow direction 14, the catching groove 8 is defined by a catching edge 9, for example the catching edge 9 may be formed by a part of the outer wall 15. The capture groove 8 is defined radially inwards by an edge 10, which edge 10 extends at a distance from the inner surface 5 in the circumferential direction of the flow channel 1 and can be configured, for example, as a circumferential strip (circular circumferential strip). Furthermore, the catch basin 8 is in fluid connection with an outflow device 12. Preferably, a condensate collector 11 is additionally arranged upstream of the outflow device 12, which condensate collector 11 improves the collection and discharge of condensate. The direction of flow of condensate through the catch tank 8, the condensate collector 11 and the outflow device 12 is indicated by arrows 13.

In the variant shown in fig. 1, the flow channel 1 according to the invention is fluidly connected at its outlet 3 to a compressor 20, for example the compressor 20 of a turbocharger 22. The compressor 20 includes a compressor wheel 21. By discharging condensate, in particular condensate contained in the exhaust gas flow, by means of the flow channel 1 according to the invention, the compressor wheel 21 of the compressor 20 is protected against condensate water.

In the variant shown in fig. 1, at least one vortex generator 6 is arranged at a distance 23 from the outlet 3 or at a distance from the catch basin 8. The spacing 23 is preferably greater than twice the inner diameter 24 of the flow channel 1.

Fig. 3 shows a schematic view of a motor vehicle 25 according to the invention. The motor vehicle 25 includes a turbocharger 22 having a compressor 20 and an exhaust gas recirculation device 27. The exhaust gas recirculation device 27 and the compressor 20 are fluidly connected to each other via a flow channel 1 according to the invention.