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 V·斯米利亚诺夫斯基 F·A·萨默候夫 J·克默林 H·M·金德尔 H·弗里德 于 2020-01-16 设计创作，主要内容包括：用于分离和排出冷凝物的流道。描述了一种具有内表面(5)、入口(2)和出口(3)的流道(1),其中入口(2)被设计用于与排气再循环流道的流体连接,并且出口(3)被设计用于与压缩机(20)的入口的流体连接。入口(2)包括中心线(4),并且至少一个涡流发生器(6)布置在入口(2)的下游和出口(3)的上游,所述涡流发生器在径向方向(16)上可移动。在流道(1)的内表面(5)中、在出口(3)的上游且在所述至少一个涡流发生器(6)的下游布置有沿出口(3)的圆周延伸的环形凹陷(8),其中环形凹陷(8)流体连接至流出部(12)。(A flow channel for separating and discharging the condensate. A flow channel (1) with an inner surface (5), an inlet (2) and an outlet (3) is described, wherein the inlet (2) is designed for fluid connection with an exhaust gas recirculation flow channel and the outlet (3) is designed for fluid connection with an inlet of a compressor (20). The inlet (2) comprises a centre line (4) and at least one vortex generator (6) is arranged downstream of the inlet (2) and upstream of the outlet (3), said vortex generator being movable in a radial direction (16). An annular recess (8) extending along the circumference of the outlet (3) is arranged in the inner surface (5) of the flow channel (1), upstream of the outlet (3) and downstream of the at least one vortex generator (6), wherein the annular recess (8) is fluidly connected to the outflow (12).)

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

it is characterized in that

The flow channel (1) comprises a centre line (4) and at least one vortex generator (6) is arranged downstream of the inlet (2) and upstream of the outlet (3), the vortex generator being movable in the radial direction (16) and being arranged in the inner surface (5) of the flow channel (1), upstream of the outlet (3) and downstream of the at least one vortex generator (6) with an annular recess (8) extending in the circumferential direction of the flow channel (1), wherein the annular recess (8) is fluidly connected to an outflow (12).

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

it is characterized in that

The at least one vortex generator (6) is movable in the radial direction (16) to a position where it terminates at the inner surface (5) of the flow channel (1).

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

it is characterized in that

The annular recess (8) comprises a condensate collector connected to the outflow (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) having a coolable arrangement.

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

it is characterized in that

The at least one vortex generator (6) is 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 vortex generator (6) is arranged in the axial direction at a distance (23) from the annular recess (8) that is 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 recirculation valve and/or a low pressure exhaust gas recirculation combination valve, or the inlet (2) is fluidly connected to a three-way exhaust gas recirculation valve and/or a low pressure exhaust gas recirculation combination valve.

8. A compressor (20) including an inlet,

it is characterized in that

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

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

it is characterized in that

The turbocharger comprises a compressor (20) according to the preceding claim.

10. 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.

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

it is characterized in that

The device is designed as a low-pressure exhaust gas recirculation device.

12. Method for operating an exhaust gas recirculation arrangement (27) according to one of claims 10 and 11,

it is characterized in that

The method comprises the following steps:

-if exhaust gas is being recirculated, said at least one vortex generator (6) is moved inwardly in said radial direction (16) into said flow channel (1), resulting in said vortex generator (6) protruding into said flow channel (1),

-if no exhaust gas is being recirculated, said at least one vortex generator (6) is moved outwardly in said radial direction (16), at least as far as said inner surface (5) of said flow channel (1).

13. The method of claim 12, wherein the first and second light sources are selected from the group consisting of,

it is characterized in that

If no exhaust gas is being recirculated, the at least one vortex generator (6) is moved outwardly in the radial direction (16), resulting in the vortex generator (6) terminating at the inner surface (5) of the flow channel (1).

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

Technical Field

The present invention relates to runners, and more particularly to runners used in conjunction with exhaust gas recirculation runners 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 achieve the desired emission limits of the exhaust gas, exhaust gas recirculation is often performed, particularly in conjunction with various exhaust aftertreatment methods, such as selective catalytic reduction using a lean NOx trap and a catalytic converter. 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 penetrate to the compressor. In this case, the action of the condensate droplets on the compressor blades can cause damage to the compressor wheel due to shear forces.

Therefore, it is important and challenging to avoid condensate formation and to remove condensate from the recirculated exhaust gas. In WO 2008/129076 a1, the vortex generator and the condenser are arranged directly upstream of the compressor of the turbocharger. Document US 6,748,741B 2 describes the possibility of collecting charge air condensate in connection with an exhaust gas recirculation system. For this purpose, an annular lip having an annular reservoir and an outflow is arranged in the flow channel. Another variant for collecting condensate formed during cooling of recirculated exhaust gas is described in document JP 6370147B 2, in which a condensate absorber is used.

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 in connection with an exhaust gas recirculation system and for arrangement upstream of a compressor, which flow channel removes and discharges condensate, in particular from a gas to be 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.

Said object is achieved by a flow channel according to patent claim 1, a compressor according to patent claim 8, a turbocharger according to patent claim 9, an exhaust gas recirculation device according to patent claim 10, a method for operating an exhaust gas recirculation device according to patent claim 12 and a motor vehicle according to patent claim 14. 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 designed for fluid connection with the exhaust gas recirculation channel. The outlet is designed for fluid connection with the inlet of the compressor. The flow passage includes a centerline. At least one vortex generator is disposed downstream of the inlet and upstream of the outlet. The at least one vortex generator can be moved in the radial direction, i.e. in other words, is designed to control or change the cross section or flow cross section of the flow channel in the inlet region. An annular recess extending in the circumferential direction of the flow channel is arranged in the inner surface of the flow channel upstream of the outlet and downstream of the at least one vortex generator. The annular recess is fluidly connected to the outflow or outlet. In other words, the outflow is designed to discharge liquid, in particular condensate.

The outflow portion connected to the annular recess is preferably arranged at its geodetically lowest point. The annular recess is channel-shaped along the circumference of the flow channel and guides the condensate to the outflow portion.

An advantage of the invention is that, by means of the combination of at least one vortex generator with a condensate collecting device arranged downstream thereof, condensate present in the gas flowing through the flow channel, for example recirculated exhaust gas or an exhaust gas/air mixture, can be effectively separated and discharged. 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 generated as a result of the formation of the vortex. The condensation 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 the annular recess and discharged via the outflow.

In an advantageous variant, the at least one vortex generator is movable in the radial direction to a position in which it terminates at the inner surface of the flow channel. An advantage of this variant is that, depending on the operating conditions, vortex generators can be used on the one hand for generating vortices, while on the other hand the flow through the flow channel is not impeded if no vortex generators need to be used. In other words, for example in the case of recirculated exhaust gas, a vortex generator can be pushed radially into the flow channel, wherein the vortex generator (vortex generator) generates a vortex which has guide vanes for this purpose. The centrifugal force thus created ensures that the condensate droplets are carried towards the outer wall and into the annular duct. If no exhaust gas is being recirculated, i.e. for example only charge air is flowing through the flow channel, the at least one vortex generator can be pushed out of the flow channel in the radial direction, so that it is ensured that the flow cross section of the flow channel is not reduced. It is particularly advantageous here if the vortex generator ends up at the inner surface of the flow channel in such a "stop position", since in this case an undesired influence of possible depressions 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 recess may comprise a condensate collector or a condensate collection trough, for example in the form of a further recess in the annular recess for collecting condensate, which further recess is connected to the outflow. This has the advantage that a large amount of condensate can also be effectively drained off via the outflow.

The flow channel advantageously comprises at least one coolable wall. 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 have a coolable configuration, and condensate formation on the inner surface of the flow channel may be promoted by the cooling.

The at least one vortex generator may be in the form of a ring. Such a configuration promotes effective 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. Preferably, the at least one vortex generator is arranged in the axial direction at a distance from the annular recess which is at least twice as large as the inner diameter of the flow channel. For example, assuming a net inner diameter of the compressor inlet of 50mm, an inner diameter of the vortex generator of 30mm is advantageous. For example, the length of the ring in the direction of flow may be 5mm to 15mm by virtue of guide vanes located in the ring.

In another variation, the inlet of the flow path may include a three-way exhaust gas recirculation valve and/or a low pressure exhaust gas recirculation combination valve. Alternatively, 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 exhaust gas recirculation valve or the low pressure exhaust gas recirculation combination valve may be linked in control to control of the radial position of the vortex generator. Thus, for example, the radial position of the at least one vortex generator can be controlled as a function of the valve position.

By means of the invention, the risk of damaging a compressor arranged downstream of the flow passage is at least reduced. In particular, condensate in connection with low-pressure exhaust gas recirculation (cooling of the recirculated exhaust gas on the one hand by means of the lower temperature of the supplied and added charge air or, on the other hand, by contact with the cooler parts of the vortex generator channels used) can be separated by means of the acting centrifugal forces and then discharged. The flow channel can be dimensioned separately for the purpose of discharging the largest amount of condensate, in particular also with regard to the position and the dimensions of the at least one vortex generator and the annular recess as well as the position and the dimensions of the outflow. The use of low pressure exhaust gas recirculation is also useful for a wider range of applications by the present invention. Further, the throttle limit of the turbocharger disposed downstream of the flow passage can 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 previously described compressor according to the invention. The compressor according to the invention and the turbocharger according to the invention have the advantages already enumerated above. Especially in connection with low pressure exhaust gas recirculation, they can also be used in situations where high moisture content or low temperatures of the recirculated exhaust gas are present.

The exhaust gas recirculation device according to the invention comprises an outlet at which the above-mentioned flow channel according to the invention 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 enumerated 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 above-mentioned exhaust gas recirculation device comprises the steps of: if exhaust gas is being recirculated, the at least one vortex generator moves radially inward into the flow passage, causing the vortex generator to protrude into the flow passage. If no exhaust gas is being recirculated, the at least one vortex generator is moved outwardly in the radial direction, at least as far as the inner surface of the flow channel, thus resulting in the vortex generator not protruding at least into the flow channel. If no exhaust gas is being recirculated, the at least one vortex generator advantageously moves outwardly in a radial direction, causing it to terminate at the inner surface of the flow passage. The process according to the invention has the advantages already enumerated above. In particular, it allows the use of vortex generators matched to the respective operating conditions in conjunction with the drainage of the condensate formed.

The motor vehicle according to the invention comprises the exhaust gas recirculation device described previously and/or the above-mentioned compressor according to the invention and/or the turbocharger according to the invention. Motor vehicles have the enumerated advantages. The motor vehicle may be a passenger car, a heavy goods vehicle, a bus, a mini bus or a motorcycle.

Drawings

In the figure:

fig. 1 schematically shows a flow channel according to the invention in longitudinal section.

Fig. 2 schematically shows 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 centre line 4. In the variant shown, the centre line 4 is the centre line of both the inlet 2 and the outlet 3. As an alternative to the variant shown, the centre lines of the inlet 2 and the outlet 3 may also differ from each other, i.e. the flow channel 1 may also have one or more bends. The flow channel 1 according to the invention also 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. The at least one vortex generator 6 may for example be arranged directly at the inlet 2 or at a distance 26 of less than one third of the length of the flow channel 1. The at least one vortex generator 6 is movable in a radial direction. This is indicated by arrow 16. Thus, the at least one vortex generator 6 can be moved radially inward into the flow channel 1, causing it to protrude inward into the flow channel in the radial direction through the inner surface 5. Furthermore, the at least one vortex generator 6 can be moved outward in the radial direction 16 at least as far as the inner surface 5 of the flow channel 1, in particular to such an extent that it ends at least 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 recirculated exhaust gas) are pushed radially outwards by the centrifugal force acting on the exhaust gas due to the formation of the vortex 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 reference numeral 14. The condensate guided to the inner surface 5 by centrifugal force forms a condensate film 17 and then flows in the direction of the outlet 3 due to the flow in the flow channel 1.

The outer wall 15 of the flow channel 1 can preferably be cooled, i.e. can be provided with a cooling device, for example. This promotes the formation of condensate and ensures a more efficient separation and drainage of condensate or liquid.

An annular recess 8 extending along the circumference of the flow channel 1 is arranged in the inner surface 5 of the flow channel 1 upstream of the outlet 3 and downstream of the at least one vortex generator 6. The annular recess 8 is also fluidly connected to the outflow portion 12. In addition, a condensate collector (not shown in fig. 1) may be arranged upstream of the outflow 12, which condensate collector improves the collection and drainage of condensate. The direction of flow of condensate through the annular recess 8 and the outflow 12 is indicated by arrow 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 means of the condensate contained in the flow (in particular the exhaust gas flow) being discharged by means of the flow channel 1 according to the invention, the compressor wheel 21 of the compressor 20 is protected against condensate damage.

In the variant shown in fig. 1, the at least one vortex generator 6 is arranged at a distance 23 from the annular recess 8. The distance 23 is preferably 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 recirculation device 27. The exhaust gas recirculation device 27 and the compressor 20 are fluidly connected to each other via the flow channel 1 according to the invention.

REFERENCE SIGNS LIST

1 flow channel

2 inlet

3 outlet port

4 center line

5 inner surface

6 vortex generator

7 movement of the droplets

8 annular recess

10 distance apart

12 outflow part

13 to the flow direction

14 to the flow direction

15 outer wall

16 movability in radial direction

17 condensation membrane

20 compressor

21 compressor impeller

22 turbo charger

23 distance apart

24 inner diameter

25 Motor vehicle

26 distance

27 exhaust gas recirculation device