CN111663968A

CN111663968A - Turbine housing, multi-channel turbine and multi-channel turbocharger

Info

Publication number: CN111663968A
Application number: CN201910174200.1A
Authority: CN
Inventors: P·霍滕巴赫; H·谢尔; R·维克特
Original assignee: BorgWarner Inc
Current assignee: BorgWarner Inc
Priority date: 2019-03-08
Filing date: 2019-03-08
Publication date: 2020-09-15

Abstract

The invention relates to a turbine housing, a multi-channel turbine and a multi-channel turbocharger. A turbine housing for a multi-channel turbine with a first screw and a second screw. The first screw has a first auxiliary channel and the second screw has a second auxiliary channel, wherein the first auxiliary channel and the second auxiliary channel are in fluid connection with each other at a connection area.

Description

Turbine housing, multi-channel turbine and multi-channel turbocharger

Technical Field

The invention relates to a turbine housing for a multi-channel turbine, to a corresponding multi-channel turbine and to a turbocharger having a multi-channel turbine.

Background

More and more new generation vehicles are equipped with a supercharging device to achieve the required purpose and legal requirements. In the development of supercharging devices, it is appropriate to optimize not only the individual components but also the system as a whole with regard to its reliability and efficiency.

Known exhaust-gas turbochargers have a turbine with a turbine wheel, which is driven by the exhaust-gas flow of the combustion engine. A compressor with a compressor wheel arranged on the same shaft as the turbine wheel compresses the fresh air which is drawn in for the engine. Thereby, the amount of air or oxygen supplied to the engine for combustion is increased. This in turn leads to a power boost of the combustion engine. In particular, multi-channel turbines are also known from the prior art, which are used, for example, for six-cylinder engines.

A disadvantage of known multi-channel turbines (e.g. twin turbine or twin-scroll turbines) is that: under certain operating conditions, for example from a certain speed of rotation, the separation into two spirals can have a negative effect on the performance of the turbocharger. In order to solve this problem, it is known in the prior art to provide overflow areas in which the exhaust gas can overflow from one spiral to the other and can overflow in the opposite direction. It is also known that these overflow areas can be opened and closed variably by a linear adjustment device. A disadvantage of the known multi-channel turbine with overflow area is the flow course between the two screws.

The object of the invention is therefore to provide a turbine housing for a multi-channel turbine and a corresponding multi-channel turbine with an optimized flow profile between two screws.

Disclosure of Invention

The invention relates to a turbine housing for a multi-channel turbine according to claim 1, and to a corresponding multi-channel turbine according to claim 7, and to a turbocharger with a multi-channel turbine according to claim 15.

The turbine housing for a multi-channel turbine according to the invention comprises a first screw and a second screw. The first screw has a first auxiliary channel and the second screw has a second auxiliary channel. The first auxiliary channel and the second auxiliary channel are in fluid connection with each other at a connection area. By means of a special flow guidance through the auxiliary channel, a targeted flow is generated into and through the connection region and from the first screw to the second screw and in the opposite direction when the valve is open (the valve closing body of the valve is arranged in the connection region in the closed state). Such an optimized flow guidance in the turbine housing brings about a reduction in the pressure drop when the valve is open, in particular in the rated power range of the engine, and thus leads to an improvement in the efficiency of the turbine with the turbine housing according to the invention. Furthermore, the mass flow of the exhaust gas can be adapted by the shape of the valve closing body of the valve for any opening angle of the valve by means of the fluid connection and almost independently of the connection region.

In one embodiment, the first auxiliary channel can project from the first spiral in the flow direction before the connection region and can enter the first spiral again after the connection region, and the second auxiliary channel can project from the second spiral in the flow direction before the connection region and can enter the second spiral again after the connection region.

In a design which can be combined with all the previously described designs, the first auxiliary channel, the second auxiliary channel and the connecting region can together form an X-shaped channel region in the turbine housing. Such a channel guidance optimizes the flow profile for the overflow area and the introduction and removal of exhaust gas in the overflow area.

In a design which can be combined with all the designs described so far, the first auxiliary channel and/or the second auxiliary channel can be separated from the first screw or the second screw at least partially by a housing portion of the turbine housing. Alternatively, the first auxiliary channel and/or the second auxiliary channel can be in fluid connection with the first spiral or the second spiral along its entire length.

In a design which can be combined with all the designs described so far, a valve region for accommodating the valve closing body can be formed in this connecting region.

In a design which can be combined with all the designs described so far, a bypass opening can be arranged in the connecting region. The connection region of the turbine housing according to the invention serves not only as a connection between the two screws but at the same time also as part of the turbine housing or of a bypass assembly of the turbine with the corresponding turbine housing. It is thereby advantageously possible to control not only the overflow region between the two screws but also the bypass opening with only a single valve and a single actuator for the valve. A valve seat can be formed around the bypass opening.

In a design which can be combined with all the previously described designs, the turbine housing furthermore has a through-opening for supporting the main shaft of the valve. Due to the special design of the turbine housing, the orientation of the through-hole can be selected relatively freely compared to known solutions. On the other hand, the orientation of the spindle relative to the valve closure can also be freely designed in this way, since the plane of movement of the spindle is independent of the orientation of the closure. This brings about advantageous degrees of freedom for the design process of the turbine housing.

The invention also includes a multi-channel turbine for an exhaust gas turbocharger with a turbine wheel and a bypass assembly. The turbine according to the invention comprises a turbine housing according to one of the preceding embodiments.

In one embodiment, the bypass assembly can have a valve. In particular, the valve can be a flap valve. The valve can include a valve closure and a spindle. A lever arm can be arranged between the spindle and the valve closing body. In particular, the lever arm can be welded to the valve closure body. The valve closing body can project into the connection region of the turbine housing through a bypass opening in the closed position of the valve and interacts with the valve region in order to prevent an overflow of exhaust gas from the first spiral to the second spiral. The valve closing body can have an annular sealing surface which, in the closed position of the valve, interacts with a valve seat of the turbine housing to close the bypass opening. The valve closing body can be formed partially hollow. The valve closing body can have a projection on the side facing away from the connecting region. The projection can extend, for example, perpendicularly from the side of the valve closure body facing away from the bypass opening and serve as a stop for the lever arm when the valve is installed. Functionally, the projection serves on the one hand for correct positioning when positioning the valve closing body. On the other hand, the projection helps to ensure the position of the valve closure with respect to the lever arm during the connection of the lever arm and the valve closure, for example when welding these two parts to each other. Thereby, the projection simplifies the mounting and avoids erroneous mounting.

In a configuration of the multi-channel turbine which can be combined with all the configurations described so far, the valve can be adjusted continuously from the closed position into the open position.

In a further embodiment of the multi-channel turbine, the bypass arrangement comprises an actuator for actuating the valve.

The invention also comprises a multi-channel turbocharger with a compressor and a turbine according to one of the preceding embodiments.

Further details and features of the invention are described below with the aid of the figures.

Drawings

Fig. 1 shows a view in partial cross-section of a first embodiment of a turbine housing according to the invention or of a turbine according to the invention;

FIG. 2 shows a view of the turbine housing according to the invention or of an enlarged partial cross-sectional area of the turbine according to the invention in FIG. 1;

FIG. 3 shows a cross-sectional view of the turbine housing according to the invention or the turbine according to the invention of FIG. 1;

FIG. 4 shows a view of a flow passage of a second embodiment of a turbine housing according to the invention or a turbine according to the invention;

FIG. 5 shows another view of a flow passage of a second embodiment of a turbine housing according to the invention or a turbine according to the invention;

FIG. 6 shows a side view of a valve of a turbine according to the present invention;

fig. 7 shows a perspective view of the valve of fig. 6.

Detailed Description

Embodiments of the turbine housing 100 according to the invention or of the turbine 10 according to the invention are described below with the aid of the figures.

Fig. 1 shows a multi-channel turbine 10 according to the invention with a turbine housing 100 according to the invention. Turbomachine 10 includes a bypass assembly 300 with a valve 310, which will be described in more detail below. The turbine housing 100 includes a first screw 110 and a second screw 120. The turbine housing 100 according to the invention is explained in more detail below with reference to fig. 4 and 5, wherein in fig. 4 and 5, for better illustration, the flow profile according to the invention is illustrated by a passage in the turbine housing 100. As can be seen from fig. 4 and 5, the first screw 110 has a first auxiliary channel 112 and the second screw 120 has a second auxiliary channel 122. The first and second

auxiliary channels

112, 122 extend along a portion of the first or

second screw

110, 120. The first auxiliary channel 112 and the second auxiliary channel 122 are in fluid connection with each other at a connection region 130. Thus, the connecting region 130 shows an overflow region from the first screw 110 into the second screw 120 and in the opposite direction. By means of the particular flow guidance through the

auxiliary channels

112, 122, when the valve 310 is open, the valve closing body 312 (see fig. 5) of which is arranged in the closed state in the connection region 130 (see fig. 1), a targeted flow is generated into and through the connection region 130 and from the first screw 110 to the second screw 120 and in the opposite direction. This optimized flow guidance in the turbine housing 100 leads to a reduction in the pressure drop of the exposed (compared to the unexposed) screws 110, 120 when the valve 310 is open, in particular in the rated power range of the engine, and thus to an improvement in the efficiency of the turbine 10 with the turbine housing 100 according to the invention. Furthermore, the mass flow of the exhaust gas can be adapted by the shape of the valve closing body 312 of the valve 310 for any opening angle of the valve 310 by means of the fluid connection and almost independently of the connection region 130.

Furthermore, a flow direction 400 through the turbine housing 100 is shown in fig. 5. Correspondingly, it can be seen from fig. 5 that: the first auxiliary channel 112 projects from the first spiral body 110 in the flow direction 400 before the connection region 130 and enters the first spiral body 110 again after the connection region 130. Likewise, the second auxiliary channel 122 projects out of the second spiral body 120 in the flow direction 400 before the connecting region 130 and enters the second spiral body 120 again after the connecting region 130 (see fig. 4). As can also be seen well in fig. 4 and also in fig. 5 in part, the first auxiliary channel 112 and the second auxiliary channel 122 are each approximately divided into two sub-channels 112a, 112b or 122a, 122b, wherein the

first sub-channel

112a, 122a leads from the respective first or

second spiral

110, 120 to the connecting region 130 and the

second sub-channel

112b, 122b leads from the connecting region 130 back to the first or

second spiral

110, 120. In other words, in the turbine housing 100 according to the invention, a special overflow region is correspondingly formed in the connecting region 130, which overflow region comprises two inflow channels (sub-channels 112a and 122a) and two outflow channels (sub-channels 112b and 122b), wherein any of the two

screws

110, 120 is connected to the inflow and outflow channels. The inflow channel and the outflow channel open into the connecting region 130 or into the overflow region, so that overall an X-shaped channel region is formed for the overflow from the first screw 110 to the second screw 120 and in the opposite direction. Such a channel guidance optimizes the flow profile for the overflow area and the introduction and removal of exhaust gas in the overflow area.

In the example of fig. 4 and 5, the first and second

auxiliary passages

112, 122 are separated from the first or

second spiral

110, 120 at least in part by a housing portion of the turbine housing 100. That is, at least a portion of the auxiliary channel 112, 122 (or a portion of the

respective sub-channel

112a, 112b or 122a, 122b) extends separately past the housing wall of the turbine housing 100 beside the first and

second screws

110, 120. Alternatively, the first secondary channel 112 and/or the second secondary channel 122 can be in fluid connection with the first or

second screw

110, 120 along their entire length. In other words, in this embodiment, the first and second

auxiliary channels

112, 122 do not extend completely separately from the first and

second screws

110, 120, but are designed to be interconnected to some extent, i.e. open to each other. Such an embodiment is shown, for example, in fig. 3. Here, the

openings

114, 124 of the first spiral 110 or the second spiral 120 in the connecting region 130 can be seen.

Referring to fig. 2 and 3, a valve area 140 for accommodating a valve closing body 312 is formed in the connecting area 130. The controlled valve 310 with the valve closing body 312 arranged at or in the turbine housing 100 is designed for (approximately) closing or opening a fluid connection in the connection region 130. The valve region 140 and the valve closing body 312 are shaped in a coordinated manner. Depending on the kinematics of the valve 310, the valve 310 can completely or only approximately close the fluid connection in the connection region 130, i.e. a small gap remains between the turbine housing 100 of the valve region 140 and the valve closing body 312. Through the valve 310, it is possible to specifically control when and how much exhaust gas can flow from the first screw 110 to the second screw 120 and vice versa. Here, the valve region 140 is defined by a connection 180 of the turbine housing 100, which separates the first screw 110 from the second screw 120 (see fig. 3).

With further reference to fig. 2 and 3, a bypass opening 150 (see also fig. 4) is arranged in the connection region 130. The connection region 130 of the turbine housing 100 according to the invention serves not only as an overflow region between the two

screws

110, 120, but at the same time also as part of the turbine housing 100 or of a bypass assembly 300 of the turbine 10. It is thereby advantageously possible to control not only the overflow area between the two

screws

110, 120 but also the bypass opening 150 with only a single valve 310 and a single actuator for the valve 310 (not shown in the figures). The bypass opening 150 is part of a bypass assembly 300 through which exhaust gas can be directed from the first and

second screws

110, 120 and into the bypass formed by the bypass opening 150 via the first and second

auxiliary channels

112, 122 and the connecting region 130 so as to avoid the turbine wheel 200 of the turbine 10. A valve seat 160 (see fig. 2 and 3) is formed around the bypass opening 150. The valve seat 160 interacts with a valve closing body 312 of the controlled valve 310 in order to open and close the bypass opening 150 in a targeted manner. In the closed state of the valve 310, the valve closing body 312 lies on the valve seat 160 and closes the bypass opening 150. In this position of the valve 310, the overflow region in the connecting region 130 is also (almost) completely closed, so that the first and

second screws

110, 120 are flowed through (largely) separately from one another by the exhaust gas.

As can be seen in fig. 1 and 2, the turbine housing 100 additionally has a through-bore 170 for supporting a main shaft 314 of the valve 310. Due to the special design of the turbine housing 100, the orientation of the through-hole 170 can be selected relatively freely compared to known solutions. That is, for example, the main shaft 314 supported in the through-hole 170 need not be arranged at a particular angle to the flow direction 400 in these screws. On the other hand, the orientation of the spindle 314 relative to the valve closure 312 can also be freely designed in this way, since the plane of movement of the spindle 314 is independent of the orientation of the closure 312. This brings about advantageous degrees of freedom for the design process of the turbine housing 100.

As can be seen, for example, in fig. 1, a multi-channel turbine 10 according to the present invention additionally includes a turbine wheel 200 and the aforementioned bypass assembly 300. The bypass assembly 300 includes a valve 310. The valve 310 shown in fig. 1, 3, and 5-7 is a flap valve. The valve 310 is described in more detail below with reference to fig. 6 and 7. The valve 310 includes a valve closure 312 and a spindle 314. A lever arm 316 is arranged between the main shaft 314 and the valve closing body 312. In particular, the lever arm 316 can be welded to the valve closure body 312. The lever arm 316 and the spindle 314 can be of one-piece design. The valve closing body 312 projects through the bypass opening 150 into the connecting region 130 of the turbine housing 100 in the closed position of the valve 310 and interacts with the valve region 140 in order to prevent an overflow of exhaust gas from the first spiral body 110 to the second spiral body 120. The valve closing body 312 has an annular sealing surface 312a which, in the closed position of the valve 310, interacts with the valve seat 160 of the turbine housing 100 to close the bypass opening 150. In other words, the shape of the valve closing body 312 is also referred to in the illustrated case as approximately hat-shaped, wherein the hat-shaped flange forms an annular sealing surface 312 a. However, the cross-sectional shape of the valve closing body 312 in the region of the sealing surface 312a can also be designed in other shapes (for example oval/elliptical) or have a completely custom shape in order to optimize the flow in the connecting region 130 in the region around the valve 310. The valve seat 160 is then correspondingly adapted. Furthermore, as can be seen in fig. 7, the valve closing body 312 can be formed at least partially hollow. In the hollow valve closure 312, a cylindrical bulge 320 extends from the bottom of the valve closure 312, for example, which is connected at its upper end to the lever arm 316. The shape of the valve closing body 312 can be, for example, conical or spherical or a combination of conical and spherical. However, the valve closing body 312 can also take any other three-dimensional shape in order to optimize the flow profile in the connecting region 130 in the closed and/or partially open state of the valve 310. Furthermore, the valve closing body 312 shown in fig. 7 additionally has a projection 318 in the installed state on the side facing away from the connecting region 130. The projection 318 can extend, for example, perpendicularly with respect to the cap-shaped flange from a side of the valve closure 312 facing away from the connection region 130. The protrusion 318 acts as a stop for the lever arm 316 when the valve 310 is installed. Functionally, the projection 318 serves on the one hand for correct positioning relative to the lever arm 316 and correspondingly the spindle 314 when positioning the valve closing body 312. On the other hand, the protrusion 318 helps to ensure the position of the valve closure 312 relative to the lever arm 316 during attachment of the lever arm 316 to the valve closure 312, such as when welding the two components to one another. When the valve 300 is installed, the valve closing body 312 is placed on the valve seat 160 and thus in the connecting region 130. Next, lever arm 316 is placed in position, wherein in this step, protrusion 318 determines and fixes the position of valve body 312 relative to lever arm 316. A closing force is then applied to the lever arm 316 via the spindle 314. The lever arm 316 is then welded to the valve closure 312 in this position. Thus, the projection 318 simplifies installation and avoids erroneous installation.

In particular, the actuator of the turbine 10 may be designed such that the valve 310 can be adjusted steplessly from the closed position to the open position. Depending on the position of the valve 310, i.e. the opening angle of the valve 310, the released overflow surface in the connecting region 130 changes, so that an overflow between the first and

second screws

110, 120 can be achieved; and the released bypass surface of the bypass opening 150 is changed to guide the exhaust gas aside the turbine wheel 200. The overflow and bypass surfaces can be indicated as percentage values indicating the ratio of the overflow or bypass surface to the cross-section of the sub-channel 112a or 122 a. The cross section is measured at a distance in the range of 19 to 25mm, in particular 20 to 24mm, preferably 21 to 23mm, for example about 22mm, from the outlet of the first or second

auxiliary channel

112, 122 of the first or

second screw

110, 120. That is, the cross-section is measured 19 to 25mm, in particular 20 to 24mm, preferably 21 to 23mm, for example about 22mm, after the start of the sub-channel 112a or 122 a. Here, the pitch refers to a pitch along an assumed center line of the sub-channel 112a or 122 a. The position of the cross-sections of the sub-channels 112a, 122a, with reference to which the values of the cross-section to the overflow surface and the bypass surface are indicated, is indicated in fig. 4 by dashed lines 113. The cross-sections of the sub-channels 112a, 122a are largely the same size in this region, so the values indicated below are based on the ratio of the overflow or bypass surface to the cross-section of the sub-channel 112a or 122 a.

At an opening angle of 5 ° of the valve 310, the percentage ratio of the overflow surface to the cross section of the sub-channel 112a or 122a is between 15% and 45%, in particular between 20% and 40%, preferably between 25% and 35%. At an opening angle of 15 ° of the valve 310, the percentage ratio of the overflow surface to the cross section of the sub-channel 112a or 122a is between 65% and 95%, in particular between 70% and 90%, preferably between 75% and 85%. At an opening angle of 25 ° of the valve 310, the percentage ratio of the overflow surface to the cross section of the

partial channel

112a or 122a is between 110% and 140%, in particular between 115% and 135%, preferably between 120% and 130%.

At an opening angle of 5 ° of the valve 310, the percentage ratio of the bypass area to the cross section of the

partial channel

112a or 122a is between 5% and 25%, in particular between 10% and 20%, preferably between 12% and 18%. At an opening angle of 15 ° of the valve 310, the percentage ratio of the bypass area to the cross section of the

partial channel

112a or 122a is between 10% and 30%, in particular between 15% and 25%, preferably between 17% and 23%. At an opening angle of 25 ° of the valve 310, the percentage ratio of the bypass area to the cross section of the

partial channel

112a or 122a is between 30% and 50%, in particular between 35% and 45%, preferably between 37% and 43%.

The invention also comprises a multi-channel turbocharger with a compressor and the aforementioned turbine 10 with a turbine housing 100 according to the invention.

Although the invention is described above and defined in the appended claims, it should be understood that the invention can alternatively be defined according to the following embodiments:

1. a turbine housing (100) for a multi-channel turbine (10), the turbine housing having:

a first screw (110);

a second screw (120);

characterized in that the first screw (110) has a first auxiliary channel (112) and the second screw (120) has a second auxiliary channel (122), wherein the first auxiliary channel (112) and the second auxiliary channel (122) are in fluid connection with each other in a connection region (130).

2. The turbine housing according to embodiment 1, characterized in that the first auxiliary channel (112) projects from the first spiral body (110) in the flow direction before the connection region (130) and enters the first spiral body (110) again after the connection region (130); and is

The second auxiliary channel (122) projects in the flow direction from the second screw body (120) before the connecting region (130) and enters the second screw body (120) again after the connecting region (130).

3. The turbine housing according to embodiment 1 or embodiment 2, characterized in that the first auxiliary channel (112), the second auxiliary channel (122) and the connecting region (130) together form an X-shaped channel region in the turbine housing (10).

4. The turbine housing according to one of the preceding embodiments, characterized in that the first auxiliary channel (112) and/or the second auxiliary channel (122) is separated from the first spiral (110) or the second spiral (120) at least partially by a housing portion of the turbine housing (100).

5. The turbine housing according to one of the preceding embodiments is characterised in that a valve region (140) for accommodating a valve closing body (312) is formed in the connecting region (130).

6. The turbine housing according to one of the preceding embodiments, characterized in that a bypass opening (150) is arranged in the connection region (130).

7. The turbine housing according to embodiment 6, characterized in that a valve seat (160) is formed around the bypass opening (150).

8. The turbine housing according to one of the preceding embodiments, characterized in that the turbine housing (100) furthermore has a through-opening (170) for supporting a main shaft (314) of the valve (310).

9. A multi-channel turbine (10) for an exhaust-gas turbocharger, having:

a turbine wheel (200); and

a bypass assembly (300);

characterized by a turbine housing (100) according to any of the preceding embodiments.

10. The multi-channel turbine according to embodiment 9, characterized in that the bypass assembly (300) has a valve (310), in particular wherein the valve (310) is a flap valve.

11. The multi-channel turbine according to embodiment 10, characterized in that the valve (310) comprises a valve closing body (312) and a main shaft (314).

12. The multiple-channel turbine according to embodiment 11, characterized in that a lever arm (316) is arranged between the main shaft (314) and the valve closing body (312), in particular wherein the lever arm (316) is welded to the valve closing body (312).

13. The multi-channel turbine as claimed in embodiment 11 or embodiment 12, characterized in that the valve closing body (312) projects into the connecting region (130) of the turbine housing (100) through a bypass opening (150) in the closed position of the valve (310) and interacts with the valve region (140) in order to prevent an overflow of exhaust gas from the first spiral (110) to the second spiral (120).

14. The multi-channel turbine as claimed in one of embodiments 11 to 13, characterized in that the valve closure body (312) has an annular sealing surface (312a) which, in the closed position of the valve (320), interacts with a valve seat (160) of the turbine housing (100) in order to close off the bypass opening (150).

15. The multi-channel turbine according to one of the embodiments 11 to 14, characterized in that the valve closing body (312) is formed partially hollow.

16. The multi-channel turbine as claimed in one of embodiments 11 to 15, characterized in that the valve closing body (312) has a projection (318) on the side facing away from the connecting region (130).

17. The multi-channel turbine according to any of the embodiments 10 to 16, characterized in that the valve (310) is steplessly adjustable from a closed position to an open position.

18. The multi-channel turbine according to one of the embodiments 10 to 17, characterized in that, furthermore, the bypass assembly (300) comprises an actuator for actuating the valve (310).

19. A multi-channel turbocharger having:

a compressor; and

the turbine according to any one of embodiments 9 to 18.

Claims

a first screw (110);

a second screw (120);

2. The turbine housing as claimed in claim 1, characterized in that the first auxiliary channel (112) emerges from the first spiral (110) before the connection region (130) in the flow direction and enters the first spiral (110) again after the connection region (130); and is

The second auxiliary channel (122) emerges from the second spiral body (120) in the flow direction before the connecting region (130) and enters the second spiral body (120) again after the connecting region (130).

3. The turbine housing as claimed in claim 1 or claim 2, characterized in that the first auxiliary channel (112), the second auxiliary channel (122) and the connecting region (130) together form an X-shaped channel region in the turbine housing (10).

4. The turbine housing according to claim 1 or 2, characterized in that the first auxiliary channel (112) and/or the second auxiliary channel (122) is separated from the first spiral (110) or the second spiral (120) at least partially by a housing portion of the turbine housing (100).

5. Turbine housing according to claim 1 or 2, characterised in that a valve region (140) for accommodating a valve closing body (312) is formed in the connecting region (130).

6. The turbine housing as claimed in claim 1 or 2, characterized in that a bypass opening (150) is arranged in the connection region (130).

7. A multi-channel turbine (10) for an exhaust-gas turbocharger, having:

a turbine wheel (200); and

a bypass assembly (300);

characterized by a turbine housing (100) according to claim 1 or 2.

8. The multi-channel turbine according to claim 7, wherein the bypass assembly (300) has a valve (310), in particular wherein the valve (310) is a flap valve.

9. The multiple flow channel turbine as claimed in claim 8, wherein the valve (310) comprises a valve closing body (312) and a main shaft (314); and is

Wherein a lever arm (316) is arranged between the spindle (314) and the valve closing body (312), in particular wherein the lever arm (316) is welded to the valve closing body (312).

10. The multi-channel turbine as claimed in claim 9, characterized in that the valve closure body (312) projects into the connecting region (130) of the turbine housing (100) through a bypass opening (150) in the closed position of the valve (310) and interacts with a valve region (140) in order to prevent an overflow of exhaust gas from the first spiral (110) to the second spiral (120).

11. The multi-channel turbine as claimed in claim 9, characterized in that the valve closure body (312) has an annular sealing surface (312a) which, in the closed position of the valve (320), interacts with a valve seat (160) of the turbine housing (100) to close off the bypass opening (150).

12. The multiple flow channel turbine as claimed in claim 9, characterized in that the valve closure body (312) is formed partially hollow.

13. The multi-channel turbine as claimed in claim 9, characterized in that the valve closure body (312) has a projection (318) on the side facing away from the connecting region (130).

14. The multiple flow channel turbine as claimed in claim 8, wherein the valve (310) is steplessly adjustable from a closed position to an open position.

15. A multi-channel turbocharger having:

a compressor; and

the turbine of claim 7.