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 G·H·格劳希 F·A·萨默候夫 H·M·金德尔 H·弗 于 2019-12-30 设计创作，主要内容包括：本申请题为“用于分离和排放冷凝物的流动通道”。本申请描述了一种具有内表面(5)、入口(2)和出口(3)的流动通道(1),其中入口(2)被配置成与排气回流通道流体连通,并且出口(3)被配置成与压缩机(20)的入口流体连通。入口(2)包括中心轴线(4),并且至少一个湍流发生器(6)被布置在入口(2)的下游和出口(3)的上游并且可以在径向方向(16)上移动。在流动通道(1)的内表面(5)中布置有位于出口(3)的上游和至少一个湍流发生器(6)的下游的环形凹槽(8),该环形凹槽沿出口(3)的外围延伸并且在出口(3)的方向上与可在径向方向(19)上移动的液滴分离器(9)邻接,其中环形凹槽(8)与排放口(12)流体连通。(The application is entitled "flow channel for separating and discharging condensate". The present application describes a flow channel (1) having an inner surface (5), an inlet (2) and an outlet (3), wherein the inlet (2) is configured to be in fluid communication with an exhaust gas return channel and the outlet (3) is configured to be in fluid communication with an inlet of a compressor (20). The inlet (2) comprises a central axis (4) and at least one turbulence generator (6) is arranged downstream of the inlet (2) and upstream of the outlet (3) and is movable in a radial direction (16). An annular groove (8) is arranged in the inner surface (5) of the flow channel (1) upstream of the outlet (3) and downstream of the at least one turbulence generator (6), which annular groove extends along the periphery of the outlet (3) and adjoins a droplet separator (9) which is movable in the radial direction (19) in the direction of the outlet (3), wherein the annular groove (8) is in fluid communication with the discharge opening (12).)

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

the method is characterized in that:

the flow channel (1) comprises a central axis (4) and at least one turbulence generator (6) is arranged downstream of the inlet (2) and upstream of the outlet (3) and is movable in a radial direction (16), wherein an annular groove (8) is arranged in the inner surface (5) of the flow channel (1) upstream (6) of the outlet (3) and downstream of the at least one turbulence generator (6), which annular groove extends in the circumferential direction of the flow channel (1) and adjoins a droplet separator (9) in the direction of the outlet (3), which droplet separator (9) is movable in a radial direction (19), wherein the annular groove (8) is in fluid communication with a drain (12).

2. The flow channel (1) according to claim 1,

the method is characterized in that:

the at least one turbulence generator (6) is movable in a 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 claim 2,

the method is characterized in that:

the droplet separator (9) is movable in a radial direction (19) to a position where it ends at the inner surface (5) of the flow channel (1).

4. The flow channel (1) according to any one of claims 1 to 3,

the method is characterized in that:

the annular groove (8) comprises a condensate collector connected to the drain (12).

5. The flow channel (1) according to any one of claims 1 to 4,

the method is characterized in that:

the flow channel (1) comprises at least one wall (15) configured to be coolable.

6. The flow channel (1) according to any one of claims 1 to 5,

the method is characterized in that:

the at least one turbulence generator (6) is configured in the form of a ring.

7. The flow channel (1) according to any one of claims 1 to 6,

the method is characterized in that:

the at least one turbulence generator (6) is arranged with a spacing (23) from the droplet separator (8) in axial direction that is at least twice the inner diameter (24) of the flow channel (1).

8. The flow channel (1) according to any one of claims 1 to 7,

the method is characterized in that:

the inlet (2) comprises a three-way exhaust gas return valve and/or a low pressure exhaust gas return combination valve, or the inlet (2) is in fluid communication with the three-way exhaust gas return valve and/or the low pressure exhaust gas return combination valve.

9. A compressor (20) comprising an inlet,

the method is characterized in that:

at the inlet a flow channel (1) according to any one of claims 1 to 8 is arranged.

10. A turbocharger (22) of the type described,

the method is characterized in that:

comprising a compressor (20) according to the preceding claim.

11. An exhaust gas recirculation arrangement (27) comprising an outlet,

the method is characterized in that:

a flow channel (1) according to any one of claims 1 to 8 is arranged at the outlet.

12. Exhaust gas recirculation arrangement (27) according to the preceding claim,

it is characterized in that the preparation method is characterized in that,

which is configured as a low pressure exhaust gas recirculation device.

13. A method for operating an exhaust gas recirculation device (27) according to claim 11 or claim 12, characterized in that:

the method comprises the following steps:

if the exhaust gas flows back, the at least one turbulence generator (6) and the droplet separator (9) are moved inward in a radial direction (16, 19) into the flow channel (1) such that the turbulence generator (6) and the droplet separator (9) protrude into the flow channel (1),

if there is no exhaust gas recirculation, the at least one turbulence generator (6) and the droplet separator (9) are moved in a radial direction (16, 19) outwards at least to the inner surface (5) of the flow channel (1).

14. The method of claim 13, wherein the first and second light sources are selected from the group consisting of,

the method is characterized in that:

if there is no exhaust gas recirculation, the at least one turbulence generator (6) and the droplet separator (9) are moved outward in a radial direction (16, 19) such that the turbulence generator (6) and the droplet separator (9) end at the inner surface (5) of the flow channel (1).

15. A motor vehicle (25) comprising an exhaust gas recirculation arrangement (27) according to claim 11 or claim 12 and/or a compressor (20) according to claim 9 and/or a turbocharger (22) according to claim 10.

Technical Field

The invention relates to a flow channel, in particular for connecting an exhaust gas return channel and a compressor. The invention also relates to a compressor, a turbocharger, an exhaust gas recirculation device, a method for operating an exhaust gas recirculation device and a motor vehicle.

Background

In order to reach the desired emission limits of the exhaust gas, an exhaust gas recirculation is usually carried out, in particular together with various exhaust gas aftertreatment methods, such as selective catalytic reduction using lean NOx traps and catalytic converters. In this case, the high specific humidity in the exhaust gas leads to the formation of a large amount of condensate during cooling of the exhaust gas. Especially in applications with low pressure exhaust gas recirculation, there is a risk that condensate will reach the compressor or compactor (compactor). In this case, the action of the condensate droplets on the compressor blades can lead to damage of the compressor wheel as a result of shear forces.

Therefore, preventing condensate formation or draining condensate from the returning exhaust is important and also presents challenges. In document US 6,748,741, a possibility is described for collecting charge air condensate together with the exhaust gas return flow. For this purpose, an annular lip with an annular reservoir and a discharge opening are arranged in the flow channel. Another variant for collecting the condensed water produced when the recirculated exhaust gas is cooled is described in document JP 6370147B2, in which a condensed water absorber is used.

Disclosure of Invention

In the context of the description, it is an object of the invention to provide an advantageous flow channel for use with an exhaust gas return and arranged upstream of a compressor, in particular which can remove and discharge condensate from the gas intended to be supplied to the compressor (that is to say, for example, returned exhaust gas, charge air or an exhaust gas/air mixture). Further objects relate to the provision of an advantageous compressor, an advantageous turbocharger, an exhaust gas recirculation device, a method for operating an exhaust gas recirculation device, and a motor vehicle.

The above object is achieved by a flow channel, a compressor, a turbocharger, an exhaust gas recirculation device, a method for operating an exhaust gas recirculation device and a motor vehicle according to the invention. The preferred embodiments include other advantageous embodiments of the present invention.

A flow channel according to the present invention comprises an inner surface, an inlet and an outlet. In this example, the inlet is configured to be in fluid communication with the exhaust gas return passage. The outlet is configured to be in fluid communication with an inlet of the compressor. The flow passage includes a central axis. At least one turbulence generator is arranged downstream of the inlet and upstream of the outlet. The at least one turbulence generator may be movable in a radial direction, that is to say it is configured to control or change the cross-section of the flow channel or the flow cross-section in the inlet region. In the inner surface of the flow channel, upstream of the outlet and downstream of the at least one turbulence generator, an annular groove is arranged, which extends in the peripheral direction of the flow channel and adjoins, in the direction of the outlet, a droplet separator, which is movable in the radial direction. The annular groove is fluidly connected to a drain or outlet. In other words, the drain is configured to drain fluid, in particular condensed water.

For example, the droplet separator may be configured in the form of a collecting edge or in the form of an edge extending in a peripheral direction or in the form of a barrier extending in a peripheral direction. For example, the droplet separator may be arranged with a spacing from the outlet that is less than half the inner diameter of the flow channel.

The discharge opening connected to the annular groove is preferably arranged at its geodetically lowest point. The annular groove is configured in a channel-like manner along the periphery of the flow channel and guides the condensate water to the drain.

The invention has the following advantages: since the combination of at least one turbulence generator has a collecting device for condensed water arranged downstream thereof, condensed water present in the gas guided through the flow channel (for example recirculated exhaust gas or exhaust gas/air mixture) can be effectively separated and discharged. By means of the at least one turbulence generator, the liquid contained in the gas can be guided due to the centrifugal forces generated by the formation of turbulence on the inner surface of the flow channel. The condensation film formed on the inner surface of the flow channel (which is promoted in particular by the temperature of the flow channel walls being below the dew point of water) is then collected in the annular groove and discharged via the discharge opening.

In an advantageous variant, the at least one turbulence generator and/or droplet separator can be moved in the radial direction to a position where they end at the inner surface of the flow channel. This variant has the following advantages: on the one hand turbulence generators and/or droplet separators can be used, depending on the operating conditions, in order to generate turbulence and separate condensate, but on the other hand the flow through the flow channel is not impeded if their use is not required. That is to say, for example in the case of recirculated exhaust gas, the turbulence generator and/or the droplet separator can be pushed radially into the flow channel, wherein turbulence is generated by the turbulence generator (vortex generator) having guide vanes for this purpose. The centrifugal force generated transports the condensate droplets towards the outer wall and further into the annular channel. If there is no exhaust gas recirculation, that is to say, for example, only charge air is conducted through the flow channel, the at least one turbulence generator and/or droplet separator can be pushed out of the flow channel in the radial direction, so that the flow cross section of the flow channel is not reduced. In this case, it is particularly advantageous for the turbulence generator and/or the droplet separator to end up at the inner surface of the flow channel in such a "parking position", because in this case an undesired influence of potential recesses in the inner surface of the flow channel on the flow characteristics is prevented. Therefore, the present invention is also advantageous in reducing fuel consumption and pollutant emissions.

In another variant, the annular groove may comprise a condensate collector or a condensate collecting container, for example in the form of another of the annular grooves for collecting condensate, which is connected with the drain. This has the advantage that a large amount of condensate can also be effectively discharged through the discharge opening.

Advantageously, the flow channel 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 condensate formation on the inner surface of the flow channel may be promoted as a result of this cooling.

The at least one turbulence generator may be configured in the form of a ring. Such an embodiment promotes an efficient turbulence formation over the entire flow cross section. The droplet separator is also preferably constructed in an annular manner.

The flow passage may have an inner diameter and a length, wherein the length is at least twice the inner diameter. Preferably, the at least one turbulence generator is arranged with a spacing from the droplet separator in the axial direction of at least twice the inner diameter of the flow channel. For example, in case the net inner diameter of the compressor inlet is 50mm, an inner diameter of the turbulence generator of 30mm is advantageous. Since the guide vanes are located in the ring, their length in the direction of flow may be, for example, 5mm to 15 mm.

In another variation, the inlet of the flow passage may include a three-way exhaust gas return valve and/or a low pressure exhaust gas return combination valve. Alternatively, the inlet may be in fluid communication with a three-way exhaust gas return valve and/or a low pressure exhaust gas return combination valve. In this case, the control of the three-way exhaust gas return valve or the low-pressure exhaust gas return combination valve can be connected in terms of control to the control of the radial position of the turbulence generator and/or of the droplet separator. Thus, it is for example possible to control the radial position of the at least one turbulence generator and the droplet separator in dependence on 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, the condensate formed in connection with the low-pressure exhaust gas return can cool the returned exhaust gas on the one hand by the lower temperature of the supplied and added charge air or on the other hand by contact with the cooler parts of the flow channel used and subsequently be discharged by the turbulence generator by means of active centrifugal forces. In order to drain the maximum amount of condensate, the flow channels can be dimensioned separately, in particular also with regard to the position and dimensions of the at least one turbulence generator, the annular groove and the droplet separator and the drain. As a result of the present invention, the use of low pressure exhaust gas recirculation may have a wider range of applications. Furthermore, the so-called "throttle limit" (chokelimit) of the turbocharger arranged downstream of the flow channel can be extended.

The compressor according to the invention comprises an inlet at which the above-mentioned flow channel according to the invention is arranged. The turbocharger according to the invention comprises the above-described compressor according to the invention. The compressor according to the invention and the turbocharger according to the invention have the advantages mentioned above. In particular, they can also be connected with a low-pressure exhaust gas return with a high humidity level or a low return exhaust gas temperature.

The exhaust gas recirculation apparatus according to the present invention includes an outlet at which the above-described flow passage according to the present invention is arranged. Preferably, the exhaust gas recirculation device is configured as a low pressure exhaust gas recirculation device. The exhaust gas recirculation apparatus according to the present invention has the above-mentioned advantages. Further, the exhaust gas recirculation apparatus according to the present invention may include the above-described compressor and/or the above-described turbocharger.

The method for operating the above exhaust gas recirculation apparatus according to the present invention includes the steps of: if the exhaust gas flows back, the at least one turbulence generator and the droplet separator move inward in the radial direction into the flow channel, so that the turbulence generator and the droplet separator protrude into the flow channel. If there is no exhaust gas recirculation, the at least one turbulence generator and the droplet separator are moved in the radial direction at least to the inner surface of the flow channel outwards, i.e. such that the turbulence generator and the droplet separator do not protrude at least into the flow channel. Advantageously, if there is no exhaust gas recirculation, the at least one turbulence generator and the droplet separator are moved outwards in the radial direction such that they end at the inner surface of the flow channel. The method according to the invention has the advantages mentioned above. In particular, this enables the use of turbulence generators to be adapted to the respective operating conditions and to the droplet separator to be associated with the discharge of the condensate formed.

The motor vehicle according to the invention comprises the above-mentioned exhaust gas recirculation device and/or the above-mentioned compressor according to the invention and/or the turbocharger according to the invention. The motor vehicle has the advantages already mentioned above. The motor vehicle may be a passenger car, truck, bus or motorcycle. The exhaust gas recirculation device according to the invention and/or the compressor according to the invention and/or the turbocharger according to the invention can also be used in combination with a stationary motor.

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 motor vehicle according to the invention.

Detailed Description

The flow channel 1 according to the invention shown in fig. 1 comprises an inlet 2, an outlet 3 and a central axis 4. In the variant shown, the central axis 4 is both the central axis of the inlet 2 and the outlet 3. Instead of the shown variant, the central axes of the inlet 2 and the outlet 3 may also differ 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 turbulence generator 6 is arranged downstream of the inlet 2 and upstream of the outlet 3. For example, the at least one turbulence generator 6 may be arranged directly at the inlet 2 or at a spacing 26 of less than one third of the length of the flow channel 1. At least one turbulence generator 6 can be moved in the radial direction. This is indicated by arrow 16. Thus, the at least one turbulence generator 6 can be pushed radially inwards into the flow channel 1 such that it projects in the radial direction inwards into the flow channel 1 past the inner surface 5. Furthermore, the at least one turbulence generator 6 can be moved outward in the radial direction 16 at least to the inner surface 5 of the flow channel 1, in particular until it ends at the inner surface 5, that is to say does not protrude into the flow channel 1.

By means of the at least one turbulence generator 6, turbulence is created in the gas flowing through the flow channel 1, wherein droplets contained in the gas (e.g. return exhaust gas) are pressed radially outwards due to the centrifugal force exerted thereon by the turbulence formation and are thus guided onto the inner surface 5. This is indicated by arrow 7. The flow direction of the gas flowing through the inlet 2 into the flow channel 1 is indicated by 14. The condensate guided by the centrifugal force onto the inner surface 5 forms a condensate film 17 and subsequently flows in the direction of the outlet 3 due to the flow in the flow channel 1.

Preferably, the outer wall 15 of the flow channel 1 may be cooled, which is for example provided with cooling means. The formation of condensate is thereby promoted and a more efficient separation and drainage of condensate or liquid is achieved.

Upstream of the outlet 3 and downstream of the at least one turbulence generator 6, an annular groove 8 extending along the periphery of the flow channel 1 is arranged in the inner surface 5 of the flow channel 1. The annular groove 8 adjoins a droplet separator 9 in the direction of the outlet 3, which droplet separator can be moved in the radial direction.

For example, the droplet separator 9 may be arranged directly at the outlet 3 or at a spacing 10 of less than one third of the length of the flow channel 1. The droplet separator 9 can be moved in a radial direction. This is indicated by arrow 19. The droplet separator 9 can thus be moved radially inward into the flow channel 1, so that it projects in the radial direction through the inner surface 5 inward into the flow channel 1. Furthermore, the droplet separator 9 can be moved in the radial direction 19 outwards at least to the inner surface 5 of the flow channel 1, in particular until it ends at least at the inner surface 5, i.e. it does not protrude into the flow channel 1.

Furthermore, the annular groove 8 is fluidly connected to a drain 12. In addition, a condensate collector may be arranged upstream of the discharge 12, which is not shown in fig. 1 and may improve the collection and discharge of condensate. The direction of flow of condensate through the collection channel 8 and the discharge 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. Since condensate, in particular contained in the exhaust gas, is discharged by means of the flow channel 1 according to the invention, the compressor wheel 21 of the compressor 20 is protected against condensate.

In the variant shown in fig. 1, at least one turbulence generator 6 is arranged with a spacing 23 from the droplet separator 9 or with a corresponding spacing from the annular groove 8. Preferably, the spacing 23 is greater than twice the inner diameter 24 of the flow channel 1.

Fig. 2 schematically shows a motor vehicle 25 according to the invention. The motor vehicle 25 includes a turbocharger 22 having a compressor 20 and an exhaust gas return 27. The exhaust gas recirculation device 27 and the compressor 20 are in fluid communication with each other through the flow channel 1 according to the present invention.

List of reference numerals

1 flow channel

2 inlet

3 outlet port

4 central axis

5 inner surface

6 turbulence generator

7 movement of the liquid droplet

8 annular groove

9 droplet separator

10 space apart

12 discharge port

13 direction of flow

14 direction of flow

15 outer wall

16 radial displacement

17 condensation membrane

19 radial displacement

20 compressor

21 compressor impeller

22 turbo charger

23 space apart

24 inside diameter

25 Motor vehicle

26 space apart

27 exhaust gas recirculation device