JP2016211512A - Turbine housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbine housing the whole of which can be efficiently cooled.SOLUTION: The turbine housing has an exhaust flow passage in which a turbine wheel is arranged, and a cooling water passage 40 in which cooling water passes. The turbine housing has a partitioning wall which extends so as to surround a rotation center of the turbine wheel in a shape of partitioning the inside of the cooling water passage 40 into a first water passage 41 which extends around a shroud part of the turbine wheel, and a second water passage 42 which extends at a portion other than a periphery of the shroud part. Furthermore, the turbine housing has: a distribution part 47 into which cooling water flows from the outside of the cooling water passage 40, and which distributes the cooling water to the first water passage 41 and the second water passage 42; an inside flow-out passage 50 which makes the first water passage 41 and the second water passage 42 communicate with each other, and makes the cooling water in the first water passage 41 flow out into the second water passage 42; and an outside flow-out passage 51 which makes the cooling water in the second water passage 42 flow out to the outside of the cooling water passage 40.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a turbine housing having a cooling water passage through which cooling water passes.

  An exhaust passage through which the exhaust gas from the internal combustion engine passes is provided inside the turbine housing of the turbocharger, and a turbine wheel is disposed inside the exhaust passage. Providing such a turbine housing with a cooling water passage through which cooling water passes is proposed (for example, Patent Document 1).

  In the turbine housing disclosed in Patent Document 1, the cooling water passage includes a scroll passage extending in a spiral shape around the entire circumference of the turbine wheel, a turbine wheel arrangement portion (shroud portion) in the exhaust passage, and a turbine wheel. It is formed in a shape surrounding the periphery of a discharge passage for discharging the exhaust that has passed through to the outside.

  Moreover, in the turbine housing of patent document 1, the inflow port which makes a cooling water flow in into the inside of a cooling water channel is provided in the part extended around the said scroll channel | path in the cooling water channel.

Japanese Patent Laying-Open No. 2015-1183

  In the turbine housing, the temperature around the shroud portion is likely to be higher than the temperature around the scroll passage and the temperature around the discharge passage. Therefore, if the flow rate of the cooling water in the cooling water passage is increased in order to sufficiently cool the shroud portion, the portions other than the shroud portion (the periphery of the scroll passage and the periphery of the discharge passage) will be excessively cooled. . On the other hand, if the flow rate of the cooling water in the cooling water channel is determined so as to maintain the temperature of the portion other than the shroud portion at an appropriate temperature, the cooling of the shroud portion is insufficient.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a turbine housing capable of efficiently cooling the whole.

  A turbine housing for achieving the above object is formed of an exhaust passage through which an exhaust gas of an internal combustion engine passes and a turbine wheel is disposed inside, and a shape surrounding the periphery of the exhaust passage, and the interior of the turbine housing includes cooling water. And a cooling water channel through which the water passes. The turbine housing includes a first water passage extending around the shroud portion of the turbine wheel in the exhaust passage and a second water passage extending at a portion other than the periphery of the shroud portion in the exhaust passage. And a partition wall extending so as to surround the rotation center of the turbine wheel. Further, the turbine housing includes a distribution unit that receives cooling water from the outside of the cooling water channel and distributes the cooling water to the first water channel and the second water channel, and the first water channel and the second water channel. An internal outflow passage for communicating cooling water in the first water passage into the second water passage and an external outflow passage for outflowing cooling water in the second water passage to the outside of the cooling water passage.

  Due to the structure of the turbine housing, the portion of the cooling water channel that extends around the shroud portion is located on the inner side (turbine wheel side) than the portion that extends outside the periphery of the shroud portion.

  According to the turbine housing, a part of the cooling water introduced from the outside into the distribution unit is distributed by the distribution unit, so that the cooling water is arranged on the inner side of the turbine housing in the periphery of the shroud unit. It can be made to flow into the extending part (first water channel). Therefore, the shroud part which becomes high temperature among the turbine housing can be suitably cooled using the cooling water having a small temperature rise due to the heat exchange with the turbine housing flowing into the first water channel from the distribution part. .

  And the remainder of the cooling water introduced into the distribution part from the outside of the turbine housing flows into a part (second passage) extending in a part other than the periphery of the shroud part in the cooling water channel. Therefore, portions other than the shroud portion in the turbine housing can also be cooled by the cooling water passing through the second passage.

  Further, the cooling water that has passed through the first water channel flows out to the second water channel through the internal outflow passage, and then flows out of the turbine housing through the external outflow passage. Therefore, although the first water channel extending around the shroud portion is disposed on the inner side of the turbine housing, the cooling water after passing through the first water channel flows out of the turbine housing through the second water channel. Can be made.

  Therefore, according to the turbine housing, the entire turbine housing can be efficiently cooled.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic which shows typically the turbocharger which has the turbine housing of 1st Embodiment, and its periphery structure. Sectional drawing which shows the cross-section of the turbine housing. The top view which shows separately the planar shape of the 1st water channel of the same turbine housing seen from the arrow B direction of FIG. 2, a 2nd water channel, and a 3rd water channel. The schematic diagram which shows typically the distribution | circulation aspect of the cooling water in the inside of the turbine housing. The perspective view which shows the internal structure of the cooling water channel in the distribution part periphery of the same turbine housing. The top view which shows the internal structure of the cooling water channel in the distribution part periphery of the same turbine housing. The top view which shows separately the planar shape of the 1st water channel of the turbine housing of 2nd Embodiment, a 2nd water channel, and a 3rd water channel. The top view which shows the internal structure of the cooling water channel of the turbine housing. The top view which shows the internal structure of the cooling water channel in the distribution part periphery of the same turbine housing.

(First embodiment)
Hereinafter, a first embodiment of the turbine housing will be described.
As shown in FIG. 1, the turbocharger 10 includes a compressor 20 disposed in the middle of the intake pipe 2 of the internal combustion engine 1, a turbine 30 disposed in the middle of the exhaust pipe 3 of the internal combustion engine 1, and A bearing housing 11 that connects the compressor 20 and the turbine 30 is provided.

  The compressor 20 has a compressor housing 21, and a compressor impeller 23 is disposed inside the compressor housing 21. The turbine 30 includes a turbine housing 31, and a turbine wheel 33 is disposed inside the turbine housing 31. The turbine wheel 33 and the compressor impeller 23 are coupled to each other via a rotary shaft 12 so as to be integrally rotatable. The rotary shaft 12 is rotatably supported by a bearing portion of the bearing housing 11.

Next, the turbine 30 and the surrounding structure will be described in detail.
As shown in FIG. 2, a duct portion 34 extending in a circular cross section around the rotation center L of the turbine wheel 33 is provided inside the turbine housing 31.

  A portion on one side (left side in FIG. 2) of the duct portion 34 is a shroud portion 35 of the turbine housing 31, and a turbine wheel 33 is disposed inside the shroud portion 35. Inside the turbine housing 31, a scroll passage 36 extending in a spiral shape is provided around the entire circumference of the turbine wheel 33. The scroll passage 36 is connected to a portion of the exhaust pipe 3 on the exhaust upstream side of the turbine 30 (upstream exhaust pipe 3A [see FIG. 1]). In the present embodiment, the duct portion 34 and the scroll passage 36 correspond to an exhaust passage through which the exhaust gas of the internal combustion engine 1 passes.

  Further, the portion of the duct portion 34 on the downstream side in the exhaust flow direction (the right side in FIG. 2) of the shroud portion 35 is a discharge passage 37 for discharging the exhaust to the outside of the duct portion 34. A portion of the exhaust pipe 3 on the exhaust downstream side of the turbine 30 (downstream exhaust pipe 3B [see FIG. 1]) is connected.

  Inside the turbine housing 31, there is provided a cooling water passage 40 for circulating cooling water in a shape surrounding the duct portion 34 and the scroll passage 36. The turbine housing 31 is a water-cooled type that is cooled through heat exchange with the cooling water by forcibly circulating the cooling water inside the cooling water passage 40. As shown in FIG. 1, the internal combustion engine 1 includes a water jacket 5 provided therein and supplied with cooling water, a radiator 6 for cooling the cooling water, a water pump 7 for pumping the cooling water, and the like. It has an engine cooling system. In the present embodiment, when the internal combustion engine 1 is operated, a part of the cooling water in the engine cooling system is supplied to the cooling water passage 40 and circulated.

Hereinafter, a specific structure of the cooling water channel 40 will be described.
As shown in FIGS. 2 and 3, the rotation center of the turbine wheel 33 is arranged inside the cooling water channel 40 so as to partition the inside into three water channels (first water channel 41, second water channel 42, and third water channel 43). Two partition walls 44 and 45 extending in an annular shape around L are provided. 3 shows the shapes of the first water channel 41, the second water channel 42, and the third water channel 43 separately.

  The partition wall 44 is formed in a shape that connects the outermost part of the outer wall of the scroll passage 36 and the outer wall of the turbine housing 31. Due to the partition wall 44, the portion formed around the scroll passage 36 in the cooling water passage 40 is the third water passage 43 and the discharge passage 37 side (in FIG. 2) which are the bearing housing 11 side (left side in FIG. 2). In the right side) (specifically, a part of the second water channel 42).

  The partition wall 45 is formed in a shape that connects the outer wall of the outer wall of the discharge passage 37 near the shroud portion 35 and the portion of the outer wall of the scroll passage 36 on the discharge passage 37 side. The partition wall 45 divides the first water channel 41 which is a portion including the periphery of the shroud portion 35 in the cooling water channel 40 and other parts (specifically, a part of the second water channel 42).

  The first water channel 41 extends in an annular shape surrounding the rotation center L of the turbine wheel 33 around the shroud portion 35 of the turbine wheel 33. The second water passage 42 is formed in a shape that surrounds the portion on the discharge passage 37 side around the scroll passage 36, the periphery of the discharge passage 37, and the periphery of the first water passage 41. Thus, the second water channel 42 extends at a portion not including the periphery of the shroud portion 35, that is, at a portion other than the periphery of the shroud portion 35. The third water passage 43 is formed in a shape surrounding a portion on the bearing housing 11 side around the scroll passage 36.

  As shown in FIGS. 3 to 5, an external inflow passage 46 is provided in the scroll passage 36 near the exhaust inflow port 36 </ b> A (see FIG. 2). Yes. The external inflow passage 46 has one end opened to the outside of the cooling water passage 40 and the other end communicated with the third water passage 43 and the distribution portion 47. The distribution unit 47 communicates with the first water channel 41 and the second water channel 42, respectively. And the cooling water which flowed into the distribution part 47 via the external inflow channel 46 is distributed to the 1st water channel 41 and the 2nd water channel 42. As shown in FIG.

  As shown in FIGS. 5 and 6, the distribution portion 47 is formed in a portion of the cooling water passage 40 on the discharge passage 37 side in a portion formed so as to surround the scroll passage 36. It arrange | positions at the edge part by the side of the exhaust inflow port 36A (refer FIG. 2). Specifically, in the cooling water passage 40, the scroll passage 36 extends at a position slightly away from the end of the scroll passage 36 on the exhaust inlet 36 </ b> A side in a direction intersecting the extending direction of the scroll passage 36, and the scroll passage of the cooling water passage 40. A rib 48 is formed to connect the inner wall closer to 36 and the inner wall farther from the scroll passage 36. 6, when the rib 48 is extended in the cooling water channel 40 so as to block the cooling water channel 40 by the rib 48, the portion surrounded by the rib 48 and the inner wall of the cooling water channel 40 ( A portion indicated by hatching in FIG. 6 functions as the distribution unit 47.

  As shown in FIG. 3 to FIG. 5, an internal inflow passage 49 that connects the distribution unit 47 and the first water channel 41 is connected to the distribution unit 47. The cooling water in the distribution part 47 flows into the first water channel 41 through the internal inflow passage 49. In the cooling water channel 40, the distribution unit 47 and the second water channel 42 communicate with each other through a gap S (FIG. 3) between the inner wall of the cooling water channel 40 and the rib 48. Through this gap S, the cooling water in the distribution part 47 flows into the second water channel 42. Thus, in the turbine housing 31, the cooling water that has flowed into the distribution portion 47 via the external inflow passage 46 is distributed to the first water passage 41 and the second water passage 42.

  As shown in FIGS. 3 to 5, the cooling water passage 40 is provided with an internal outflow passage 50 that communicates the first water passage 41 and the second water passage 42. The cooling water in the first water passage 41 flows out to the second water passage 42 through the internal outflow passage 50. Further, the cooling water channel 40 is provided with an external outflow passage 51 for allowing cooling water to flow out from the inside of the cooling water channel 40 to the outside. The external outflow passage 51 (two locations in the present embodiment) has one end communicating with the second water passage 42 and the third water passage 43 and the other end opened to the outside of the cooling water passage 40. Yes.

(Function)
Hereinafter, the operation of the turbine housing 31 of the present embodiment will be described.
As shown in FIG. 4, in the turbine housing 31, cooling water flows into the third water passage 43 from the outside of the turbine housing 31 (cooling water passage 40) through the external inflow passage 46. And the part by the side of the bearing housing 11 of the scroll channel | path 36 (refer FIG. 2) is cooled with the cooling water which passes the 3rd water path 43. FIG.

  On the other hand, the cooling water also flows into the distribution portion 47 from the outside of the turbine housing 31 through the external inflow passage 46. Then, the cooling water that has flowed into the distribution unit 47 is distributed and flows into the first water channel 41 and the second water channel 42. As a result, the shroud portion 35 (see FIG. 2) is cooled by the cooling water passing through the first water passage 41, and the portion of the scroll passage 36 on the discharge passage 37 side is cooled by the cooling water passing through the second water passage 42. The discharge passage 37 is cooled.

  The cooling water that has passed through the first water channel 41 flows out into the second water channel 42 through the internal outflow passage 50 and merges. The cooling water that has passed through the second water passage 42 and the cooling water that has passed through the third water passage 43 are discharged to the outside of the turbine housing 31 via the external outflow passage 51.

  As shown in FIG. 2, in the turbine housing 31, the first water passage 41 extending around the shroud portion 35 in the cooling water passage 40 is second in the structure other than the periphery of the shroud portion 35 due to its structure. The position is on the inner side (turbine wheel 33 side) in the turbine housing 31 than the water passage 42. Therefore, it can be said that the turbine housing 31 has a structure in which it is difficult to supply cooling water to the first water passage 41 from the outside.

  In the turbine housing 31, a distribution portion 47 is formed at a portion of the cooling water passage 40 disposed at the end of the scroll passage 36 on the exhaust inflow port 36 </ b> A side, and as shown by an arrow in FIG. Cooling water is introduced into the portion 47 from the outside of the turbine housing 31. A part of the cooling water introduced into the distribution unit 47 is distributed by the distribution unit 47 and flows into the first water channel 41 through the internal inflow passage 49. As described above, according to the turbine housing 31, the cooling water is distributed by the distribution unit 47, thereby allowing the cooling water to flow into the first water channel 41 arranged on the inner side of the turbine housing 31 in the cooling water channel 40. Can do.

  Further, according to the turbine housing 31, the cooling water that has passed through only the distribution portion 47 in the cooling water passage 40 and has flowed into the first water passage 41, in other words, the temperature rise due to heat exchange with the turbine housing 31. The shroud portion 35 that is at a high temperature in the turbine housing 31 can be suitably cooled using the cooling water with a small degree.

  In addition, as shown in FIGS. 3 and 4, the remainder of the cooling water introduced from the outside of the turbine housing 31 to the distribution portion 47 except for the amount flowing into the first water channel 41 flows into the second water channel 42. To come. Further, the cooling water introduced into the cooling water passage 40 through the external inflow passage 46 is also introduced into the third water passage 43 which is a portion extending around the bearing housing 11 side portion of the scroll passage 36 in the cooling water passage 40. Therefore, portions other than the shroud portion 35 (the scroll passage 36 and the discharge passage 37) in the turbine housing 31 can be cooled by the cooling water passing through the second water passage 42 and the third water passage 43.

  In the turbine housing 31, the cooling water that has passed through the first water passage 41 flows out to the second water passage 42 through the internal outflow passage 50, and then flows out of the turbine housing 31 through the external outflow passage 51. Therefore, although the first water channel 41 extending around the shroud portion 35 is disposed on the inner side of the turbine housing 31, the cooling water after passing through the first water channel 41 is more external than the first water channel 41. It can flow out to the outside of the turbine housing 31 via the second water channel 42 arranged on the side. As described above, according to the present embodiment, since the low-temperature cooling water can be circulated through the first water channel 41 arranged around the shroud portion 35 that is at a high temperature in the turbine housing 31, the entire turbine housing 31 is provided. Can be efficiently cooled.

  As shown in FIG. 2, in the turbine housing 31, the partition wall 45 connects the portion near the shroud portion 35 on the outer wall of the discharge passage 37 and the portion on the discharge passage 37 side on the outer wall of the scroll passage 36. Is formed. Therefore, the heat of the outer wall of the shroud portion 35 that becomes high temperature can be released to the outer wall of the relatively low temperature scroll passage 36 through heat conduction by the partition wall 45. Thereby, the excessive rise of the temperature of the shroud part 35 can be suppressed.

  In the turbine housing 31, since the partition walls 44 and 45 are provided, the strength of the turbine housing 31 is higher than that in which the partition walls 44 and 45 are not provided. Thereby, the thermal deformation of the turbine housing 31 is suppressed, and the change in the gap between the inner wall of the shroud portion 35 and the turbine wheel 33 can be suppressed. Therefore, the reduction in the supercharging efficiency of the turbocharger 10 can be suppressed.

As described above, according to the present embodiment, the following effects can be obtained.
(1) The entire turbine housing 31 can be efficiently cooled.
(Second Embodiment)
Hereinafter, a second embodiment of the turbine housing will be described focusing on differences from the first embodiment.

The turbine housing of the present embodiment is different from the turbine housing of the first embodiment in the structure of the cooling water channel.
Hereinafter, the specific structure of the cooling water channel of the turbine housing of this embodiment will be described. The basic structure of the turbocharger of the present embodiment is the same as that of the turbocharger 10 of the first embodiment (see FIGS. 1 and 2). Therefore, the same components are denoted by the same reference numerals, and details thereof are shown. I will omit the explanation.

  As shown in FIG. 7, the inside of the cooling water channel 70 is partitioned into three water channels (a first water channel 71, a second water channel 72, and a third water channel 73) by two partition walls 44 and 45 (see FIG. 2). ing. 7 shows the planar shapes of the first water channel 71, the second water channel 72, and the third water channel 73 separately. A portion formed around the scroll passage 36 in the cooling water passage 70 by the partition wall 44 is a portion on the third water passage 73 on the bearing housing 11 side and a portion on the discharge passage 37 side (specifically, one portion of the second water passage 72 Part). Further, the partition wall 45 divides a first water channel 71 that is a portion including the periphery of the shroud portion 35 in the cooling water channel 70 and other parts (specifically, a part of the second water channel 72).

  The first water channel 71 extends in an annular shape surrounding the rotation center L of the turbine wheel 33 around the shroud portion 35 of the turbine wheel 33. The second water passage 72 is formed in a shape surrounding a portion on the discharge passage 37 side around the scroll passage 36, the periphery of the discharge passage 37, and the periphery of the first water passage 71. As described above, the second water channel 72 extends at a portion other than the periphery of the shroud portion 35. The third water passage 73 is formed in a shape surrounding a portion on the bearing housing 11 side around the scroll passage 36.

  As shown in FIGS. 8 and 9, an external inflow passage 76 for allowing cooling water to flow into the inside from the outside of the cooling water passage 70 is provided in the middle of the scroll passage 36 in the exhaust flow direction on the outer wall of the turbine housing. Is provided. One end of the external inflow passage 76 is opened to the outside of the cooling water passage 70, and the other end is communicated with the third water passage 73 and the distribution portion 77. An internal inflow passage 79 that connects the distribution portion 77 and the first water channel 71 is connected to the distribution portion 77. Cooling water in the distributor 77 flows into the first water channel 71 through the internal inflow passage 79.

  As shown in FIGS. 8 and 9, the distribution portion 77 is a portion on the discharge passage 37 side (second water passage 72) in a portion formed so as to surround the scroll passage 36 in the cooling water passage 70. ) In the middle of the scroll passage 36 in the exhaust flow direction. In the turbine housing of the present embodiment, the flow direction of the cooling water flowing into the distribution portion 47 from the external inflow passage 76 matches the flow direction of the cooling water flowing into the internal inflow passage 49 from the distribution portion 47. The internal inflow passage 79 and the external inflow passage 76 are arranged. A portion surrounded by a surface connecting the end portion of the opening in the distribution portion 47 of the internal inflow passage 49 and the end portion of the opening in the distribution portion 47 of the external inflow passage 46 (a portion indicated by hatching in FIG. 9). Functions as the distribution unit 47.

  The distributor 77 having such a structure is surrounded by a second water channel 72. Therefore, the cooling water that has flowed into the distribution unit 77 from the external inflow passage 46 also flows into the second water channel 72 from the distribution unit 47. Thus, in the turbine housing of the present embodiment, the cooling water that has flowed into the distribution portion 77 via the external inflow passage 76 is distributed to the first water passage 71 and the second water passage 72.

  The cooling water passage 70 is provided with an internal outflow passage 80 that connects the first water passage 71 and the second water passage 72. The cooling water in the first water channel 71 flows out to the second water channel 72 through the internal outflow channel 80. Further, the cooling water passage 70 is provided with external outflow passages 81 (two in this embodiment) for allowing the cooling water to flow out from the inside of the cooling water passage 70 to the outside. The outer outflow passage 81 has one end communicating with the second water passage 72 and the third water passage 73 and the other end opened to the outside of the cooling water passage 70.

According to such a turbine housing, the same effect as the turbine housing 31 of the first embodiment can be obtained.
(Other embodiments)
Each of the above embodiments may be modified as follows.

  In each embodiment, the partition wall 44 may be omitted.

  DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Intake pipe, 3 ... Exhaust pipe, 3A ... Upstream exhaust pipe, 3B ... Downstream exhaust pipe, 5 ... Water jacket, 6 ... Radiator, 7 ... Water pump, 10 ... Turbocharger, 11 ... Bearing housing, 12 ... Rotating shaft, 20 ... Compressor, 21 ... Compressor housing, 23 ... Compressor impeller, 30 ... Turbine, 31 ... Turbine housing, 33 ... Turbine wheel, 34 ... Duct section, 35 ... Shroud section, 36 ... Scroll path 36A ... Exhaust inlet, 37 ... Discharge passage, 40, 70 ... Cooling channel, 41, 71 ... First channel, 42, 72 ... Second channel, 43, 73 ... Third channel, 44, 45 ... Partition wall, 46,76 ... external inflow passage, 47,77 ... distribution part, 48 ... rib, 49,79 ... internal inflow passage, 50,80 ... internal flow Passage, 51, 81 ... outflow passage.

Claims (1)

An exhaust passage through which the exhaust of the internal combustion engine passes and in which the turbine wheel is disposed;
A cooling water passage formed in a shape surrounding the periphery of the exhaust passage and through which cooling water passes;
In the shape of partitioning the inside of the cooling water channel into a first water channel extending around the shroud part of the turbine wheel in the exhaust flow channel and a second water channel extending in a part other than the periphery of the shroud part in the exhaust flow channel, A partition wall extending around the rotation center of the turbine wheel;
A distribution unit that flows in the cooling water from the outside of the cooling water channel and distributes the cooling water to the first water channel and the second water channel;
An internal outflow passage through which the first water channel and the second water channel communicate with each other, and the cooling water in the first water channel flows out into the second water channel;
A turbine housing comprising an external outflow passage for allowing the cooling water in the second water passage to flow out of the cooling water passage.