阅读说明：本技术 用于分离和排出冷凝物的流道 (Flow channel for separating and discharging condensate ) 是由 A·库斯克 F·A·萨默候夫 J·克默林 V·斯米利亚诺夫斯基 H·M·金德尔 H·弗里德 于 2020-01-08 设计创作，主要内容包括：本发明涉及用于分离和排出冷凝物的流道。描述一种具有内表面(5)、入口(2)和出口(3)的流道(1),其中入口(2)经配置以技术流动方式连接至排气回流通道,并且出口(3)经配置以技术流动方式连接至压缩机(20)的入口。流道(1)包括中心轴线(4),并且至少一个湍流发生器(6)布置在入口(2)的下游且在出口(3)的上游。至少一个湍流发生器(6)可在径向方向(16)上移位。在出口(3)上布置有冷凝物收集设备(8),该冷凝物收集设备(8)沿出口(3)的周边延伸,并且由流道(1)的内表面(5)径向向外界定并且在轴向方向上由收集边缘(9)界定,其中冷凝物收集设备(8)以技术流动方式连接至排出口(12)。(The invention relates to a flow channel for separating and discharging condensate. A flow channel (1) with an inner surface (5), an inlet (2) and an outlet (3) is described, wherein the inlet (2) is configured to be connected in a technical flow manner to an exhaust gas return channel and the outlet (3) is configured to be connected in a technical flow manner to an inlet of a compressor (20). 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). At least one turbulence generator (6) is displaceable in the radial direction (16). A condensate collecting device (8) is arranged on the outlet (3), which condensate collecting device (8) extends along the periphery of the outlet (3) and is delimited radially outwards by the inner surface (5) of the flow channel (1) and in the axial direction by a collecting edge (9), wherein the condensate collecting device (8) is connected to the discharge opening (12) in a technical flow manner.)

1. A flow channel (1) having an inner surface (5), an inlet (2) and an outlet (3), wherein the inlet (2) is configured for technical flow connection to an exhaust gas return channel and the outlet (3) is configured for technical flow connection to an inlet of a compressor (20),

it 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 displaceable in a radial direction (16), and a condensate collecting device (8) is arranged on the outlet (3), which condensate collecting device (8) extends along the periphery of the outlet (3) and is delimited radially outwards by the inner surface (5) of the flow channel (1), and which condensate collecting device (8) is delimited in an axial direction by a collecting edge (9), wherein the condensate collecting device (8) is connected to the drain (12) in a technical flow manner.

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

it is characterized in that

The at least one turbulence generator (6) is displaceable in a radial direction (16) to a position in which the at least one turbulence generator (6) ends at the inner surface (5) of the flow channel (1).

3. Flow channel (1) according to claim 1 or 2,

it is characterized in that

The condensate collecting device (8) comprises a condensate collector connected to the discharge opening (12).

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

it is characterized in that

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

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

it is characterized in that

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

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

it is characterized in that

The at least one turbulence generator (6) is arranged with a spacing (23) in axial direction from the condensate collecting device (8), the spacing (23) being at least twice the inner diameter (24) of the flow channel (1).

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

it 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 connected in a technical flow manner to a three-way exhaust gas return valve and/or a low pressure exhaust gas return combination valve.

8. A compressor (20) including an inlet (28),

it is characterized in that

The flow channel (1) according to any of claims 1 to 7 is arranged at the inlet.

9. The compressor (20) of claim 8,

it is characterized in that

The inlet (28) of the compressor (20) has an inner diameter (29) and the outlet (3) of the flow channel (1) has an inner diameter (30), the inner diameter (30) being determined by the collecting edge (9) and the inner diameter (30) being smaller than the inner diameter (29) of the inlet (28) of the compressor (20).

10. A turbocharger (22) for the gas turbine,

it is characterized in that

Comprising a compressor (20) according to claim 8 or 9.

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

it is characterized in that

The flow channel (1) according to any of claims 1 to 7 is arranged at the outlet.

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

it is characterized in that

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

13. Method for operating an exhaust gas recirculation device (27) according to one of claims 11 or 12,

it is characterized in that

The method comprises the following steps:

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

-if no exhaust gas is recirculated, the at least one turbulence generator (6) is displaced outwardly in the radial direction (16) at least as far as 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,

it is characterized in that

If no exhaust gas is recirculated, the at least one turbulence generator (6) is displaced outwardly in the radial direction (16) such that the turbulence generator (6) ends at the inner surface (5) of the flow channel (1).

15. Motor vehicle (25) comprising an exhaust gas recirculation arrangement (27) according to any one of claims 10 or 11 and/or a compressor (20) according to claim 8 and/or a turbocharger (22) according to any one of claims 9 or 10.

Technical Field

The present invention relates to flow passages, and more particularly to flow passages used in conjunction with exhaust gas return passages and compressors. 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 required exhaust emission limits, exhaust gas recirculation is often performed, in particular in combination with various exhaust aftertreatment methods, such as the use of lean NOx traps and catalytic converters that perform selective catalytic reduction. In this case, the high specific humidity in the exhaust gas causes a large amount of condensate to form 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. 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, it is important to prevent condensate formation or to drain condensate from the recirculated exhaust gas, and it is also a challenge. In document US 2011/011084 a1, upstream of the compressor, turbulence generators and grooves for discharging foreign bodies are provided. In document US 2010/0205949 a1, a turbulence generator for separating condensate is provided upstream of the compressor.

Disclosure of Invention

In view of the described background, it is an object of the present invention to provide an advantageous flow channel for use with an exhaust gas return and for arrangement upstream of a compressor, which flow channel removes and discharges condensate, in particular from the gas to be supplied to the compressor (i.e. for example return 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.

This object is achieved by a flow channel according to claim 1 of the present application, a compressor according to claim 8 of the present application, a turbocharger according to claim 10 of the present application, an exhaust gas recirculation device according to claim 11 of the present application, a method for operating an exhaust gas recirculation device according to claim 13 of the present application, and a motor vehicle according to claim 15 of the present application. The dependent claims contain further advantageous embodiments of the invention.

A flow channel according to the present invention comprises an inner surface, an inlet and an outlet. In this case, the inlet is configured for technical flow connection to the exhaust gas return channel. The outlet is configured for technical flow connection to the inlet of the compressor. The flow passage includes a central axis. At least one turbulence generator is disposed downstream of the inlet and upstream of the outlet. The at least one turbulence generator may be displaceable in a radial direction, that is to say it is configured to control or change the cross-section or flow cross-section of the flow channel in the inlet region. A condensate collecting device is arranged on the outlet, which condensate collecting device extends along the periphery of the outlet and is delimited radially outwards by the inner surface of the flow channel and in the axial direction by a collecting edge. The condensate collecting device is connected in a technical flow manner to a drain or outlet. In other words, the drain is configured to drain fluid, in particular condensed water.

The drain connected to the condensate collecting device is preferably arranged at the geodetically lowest point of the condensate collecting device. The condensate collecting device is arranged in a rim-like or channel-like manner along the periphery of the flow channel and guides the condensed water to the discharge opening.

The advantage of the invention is that, owing to the combination of at least one turbulence generator with a collecting device for condensed water arranged downstream thereof, condensed water present in the gas (for example recirculated exhaust gas or exhaust gas/air mixture) guided through the flow channel can be effectively separated and discharged. By means of the at least one turbulence 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 turbulence. The condensate film formed on the inner surface of the flow channel, which is promoted in particular by the wall temperature of the flow channel being below the dew point of water, is then collected in a condensate collecting device and discharged via a discharge opening.

A further advantage of the configuration of the condensate collecting device with a collecting edge according to the invention consists in that the separation length is shortened due to the corresponding dimensions of the collecting edge, in particular due to the high width of the collecting edge, and thus the flow channel with a uniform function in terms of condensate separation can be configured to be shortened in the axial direction. This is particularly advantageous in terms of an efficient use of installation space.

In an advantageous variant, the at least one turbulence generator can be displaced in the radial direction to a position in which it terminates at the inner surface of the flow channel. The advantage of this variant is that on the one hand the turbulence generator can be used according to the operating conditions in order to generate turbulence, and on the other hand the flow through the flow channel is not impeded if the use of a turbulence generator is not required. That is to say, for example in the case of recirculated exhaust gas, the turbulence generator can be pushed radially into the flow channel, wherein turbulence is generated via the turbulence generator (swirl generator) which has guide vanes for this purpose. The centrifugal force thus created ensures that the condensate droplets are carried by the belt towards the outer wall and further into the annular channel. If no exhaust gas is recirculated, that is to say, for example, only charge air is conducted through the flow channel, the at least one turbulence generator 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. It is particularly advantageous in case the turbulence generator ends up in the inner surface of the flow channel in such a "stop position", because in this case undesired effects of potential grooves in the inner surface of the flow channel on the flow characteristics are prevented. Therefore, the present invention is also advantageous in reducing fuel consumption and pollutant emissions.

In another variant, the condensate collecting device may comprise a condensate collector or condensate collecting container for collecting condensate, for example in the form of a radial groove in the condensate collecting device, which is connected to 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 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, preferably, the entire wall and thus the inner surface of the flow channel can be configured to be coolable, and the formation of condensate on the inner surface of the flow channel can be promoted as a result of the cooling.

The at least one turbulence generator may be configured in the form of a ring. Such embodiments promote effective turbulence 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. Preferably, the at least one turbulence generator is arranged spaced apart from the condensate collecting device in the axial direction, the spacing being 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 connected in a technical flow manner to 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 technical control to the control of the radial position of the turbulence generator. Thus, for example, the radial position of the at least one turbulence generator may be controlled in dependence on the valve position.

As a result of the invention, the risk of damaging a compressor arranged downstream of the flow passage is at least reduced. In particular, the condensate formed in connection with the low-pressure exhaust gas return can be separated by the turbulence generator by means of active centrifugal forces and subsequently discharged, on the one hand by cooling the return exhaust gas by means of the lower temperature of the supplied and added charge air or, on the other hand, by means of contact with the cooler parts of the flow channels used. The flow channels may be dimensioned separately in order to drain a maximum amount of condensate, in particular also with respect to the position and the dimensions of the at least one turbulence generator and the condensate collecting device and the drain. As a result of the invention, the use of a low pressure exhaust gas return flow is further made available for a wider range of applications. Furthermore, the closing limit (throttle limit) of the turbocharger arranged downstream of the flow passage 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. Advantageously, the inlet of the compressor has an internal diameter, while the outlet of the flow channel has an internal diameter determined by the collecting edge, which is smaller than the internal diameter of the inlet of the compressor. As a result of such an embodiment, the compressor is protected in an optimum manner against undesired penetration of the condensate water, wherein at the same time the separation length and thus the length of the flow channel is shortened.

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 already mentioned above. They may also be used in particular with low-pressure exhaust gas recirculation with recirculated exhaust gas having a high humidity level or a low 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 device according to the invention has the advantages already mentioned above. Furthermore, 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 is recirculated, at least one turbulence generator is displaced inward in the radial direction into the flow channel, so that the turbulence generator projects into the flow channel. If there is no exhaust gas recirculation, the at least one turbulence generator is displaced in the radial direction outwards as far as the inner surface of the flow channel, i.e. such that the turbulence generator at least does not protrude into the flow channel. Advantageously, if there is no exhaust gas backflow, the at least one turbulence generator is displaced outwards in the radial direction such that it terminates at the inner surface of the flow channel. The method according to the invention has the advantages already mentioned above. In particular, it enables the use of turbulence generators adapted to the respective operating conditions associated with the drainage of the formed condensate.

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. Motor vehicles have the advantages already mentioned. The motor vehicle may be a passenger car, truck, bus, mini-bus or motorcycle.

Drawings

In the figure:

fig. 1 is a schematic longitudinal sectional view of a flow channel according to the invention.

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

Fig. 3 is a schematic longitudinal sectional view of another variant of the flow channel according to the invention.

FIG. 4 is an exemplary motor vehicle according to the present invention.

Detailed Description

The flow channel 1 according to the invention shown in fig. 1 to 3 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 central axis of the outlet 2. As an alternative to the shown variant, the central axes of the inlet 2 and the outlet 3 can also differ from each other, so that the flow channel 1 can also have one or more curves. The flow channel 1 according to the invention also 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. The at least one turbulence generator 6 may for example 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 is displaceable 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 protrudes inwards in the radial direction into the flow channel on the inner surface 5. Furthermore, the at least one turbulence generator 6 can be displaced in the radial direction 16 outwards as far as the inner surface 5 of the flow channel 1, in particular until it at least ends at the inner surface 5, i.e. it 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 (for example in the recirculated exhaust gas) are pushed radially outwards by the centrifugal force acting thereon as a result of the formation of turbulence and are thus guided to the inner surface 5. This is indicated by arrow 7. The direction of flow of the gas through the inlet 2 into the flow channel 1 is indicated by 14. The condensate guided by centrifugal force onto the inner surface 5 forms a condensate film 17 and subsequently flows as a result of the flow in the flow channel 1 in the direction of the outlet 3.

Preferably, the outer wall 15 of the flow channel 1 can be cooled, i.e. for example provided with a cooling device. Thereby promoting the formation of condensate and achieving a more efficient separation and drainage of condensate or liquid.

At the outlet 3, a condensate collecting device 8 is arranged, which extends along the periphery of the flow channel 1. The condensate collecting device 8 is delimited in the radial direction by the inner surface 5 of the flow channel 1 and in the axial direction by the collecting edge 9, i.e. it is thus configured in the form of an edge in the shown variant.

In the variant shown in fig. 1, at least one turbulence generator 6 is arranged with a spacing 23 from the condensate collecting device 8. Preferably, the spacing 23 is greater than twice the inner diameter 24 of the flow channel 1.

Furthermore, the condensate collecting device 8 is connected in a technical flow manner to the discharge opening 12. Furthermore, a condensate collector 11 may be arranged upstream of the discharge opening 12, which condensate collector 11 improves the collection and discharge of condensate. The direction of flow of condensate through the condensate collecting device 8, the condensate collector 11 and the discharge opening 12 is indicated by an arrow 13. Fig. 2 is a schematic cross-sectional view along II-II of the flow channel according to the invention shown in fig. 1. In this case, the condensate collector 11 is arranged in the geographically lowest region of the condensate collecting device 8, i.e. in the 6 o' clock region.

In the variant shown in fig. 1, the flow channel 1 according to the invention is connected at its outlet 3 in a technical flow manner to a compressor 20, for example the compressor 20 of a turbocharger 22. The compressor 20 includes an inlet 28 having an inner diameter 29 and a compressor wheel 21. The compressor wheel 21 of the compressor 20 is protected from condensate water by means of the flow channel 1 according to the invention, in particular as a result of the discharge of condensate contained in the exhaust gas flow.

The inner diameter 30 of the outlet 23 of the flow channel 1 is formed by the collecting edge 9. In the variant shown in fig. 1, the internal diameter 30 of the outlet 3 of the flow channel is equal to the internal diameter 29 of the inlet 28 of the compressor 20. The flow cross section of the compressor inlet is thus fully used. The total length of the flow channel 1 shown in fig. 1 is indicated with 32.

In the variant shown in fig. 3, the inner diameter 30 of the outlet 3 of the flow channel is smaller than the inner diameter 29 of the inlet 28 of the compressor 20. Although the flow cross section of the compressor inlet is thus not fully used, the separation length and thus the total length 31 is reduced. The difference between the total length 31 and the total length 32 is indicated by arrow 33. From the viewpoint of space requirements, it is particularly advantageous to shorten the overall length.

Fig. 4 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 connected to one another in a technical flow manner by means of the flow channel 1 according to the invention.

List of reference marks

1 flow channel

2 inlet

3 outlet port

4 central axis

5 inner surface

6 turbulence generator

7 movement of the droplets

8 condensate collecting device

9 collecting edge

11 condensate collector

12 discharge of

13 direction of flow

14 direction of flow

15 outer wall

16 displacement in radial direction

17 condensation membrane

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

28 compressor inlet

29 inner diameter of compressor inlet

Inner diameter of 30 flow passage outlet

31 total length

32 total length

33 difference in length