JP2009203803A - Turbine housing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turbine housing capable of increasing degree of freedom in design of a bypass passage by avoiding stress concentration generated in an inner pipe shape member of a double structure part. <P>SOLUTION: This turbine housing 3A is provided with a scroll part 6 communicating to an inlet part 4 and extending to a wheel storage part 5, an outlet part 7 for discharging gas passing through a wheel storage part 5, and a bypass passage part 8 connecting the inlet part 4 and the outlet part 7 so as to bypass the wheel storage part 5. Part from the inlet part 4 to the scroll part 6 is constructed as the double structure part 10 in which the inner pipe shape member 11 and an outer pipe shape member 12 are combined with a gap S formed therbetween, The double structure part 10 is constructed in such a manner that gas can be introduced by making the gap S communicate with the inlet part 4 and the bypass passage part 8 is constructed to communicate with the gap S of the double structure part 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a turbine housing of a turbine incorporated in a turbocharger or the like.

  As a turbine housing, in order to prevent heat dissipation of gas introduced from the inlet of the turbine, a double structure portion is formed from the inlet portion to the scroll portion, and between the inner tubular member and the outer tubular member of the double structure portion. There is known a technique in which a gap is formed and the gap is closed at an inlet (Patent Document 1). In addition, Patent Documents 2 to 5 exist as prior art documents related to the present invention.

JP 2001-303962 A JP 2001-303963 A JP 2002-349275 A JP 2002-349276 A Japanese Utility Model Publication No. 61-49032

  The turbine housing of Patent Document 1 is provided with a bypass passage that connects the inlet portion and the outlet portion so as to bypass the wheel housing portion that houses the turbine wheel in order to avoid introducing excessive gas into the turbine wheel. Yes. The bypass passage is joined to the inner tubular member of the double structure portion by welding or the like. For this reason, stress concentration tends to occur at the joint portion with the inner tubular member. In order to alleviate the adverse effects of such stress concentration, the joint area must be reduced by reducing the passage area of the bypass passage. As a result, there is a restriction that the passage area of the bypass passage cannot be made sufficiently large.

  Therefore, an object of the present invention is to provide a turbine housing capable of expanding the degree of freedom of design of the bypass passage by avoiding stress concentration generated in the inner tubular member of the double structure portion.

  The turbine housing of the present invention includes an inlet portion for introducing gas, a wheel accommodating portion that accommodates a turbine wheel, a spiral scroll portion that communicates with the inlet portion and extends to the wheel accommodating portion, and the wheel accommodating portion. An outlet portion for discharging the gas that has passed through, and a bypass passage portion connecting the inlet portion and the outlet portion so as to be able to bypass the wheel housing portion, from the inlet portion to the scroll portion, In the turbine housing configured as a double structure portion in which a gap is formed between the inner tubular member and the outer tubular member, the double structure portion is configured such that the gap communicates with the inlet portion. By which gas can be introduced, and the bypass passage portion is configured to communicate with the gap of the double structure portion, To solve the problems mentioned (claim 1).

  In this turbine housing, since a gap formed between the inner tubular member and the outer tubular member communicates with the inlet portion, the gas introduced into the inlet portion is guided to the gap. Since the bypass passage portion communicates with the clearance, when the bypass passage is opened, the gas guided to the clearance is discharged to the outlet portion via the bypass passage portion. When the bypass passage is closed, there is no difference in pressure between the inside and outside of the double structure portion, so that the gas guided to the inlet portion passes through the inner tubular member and is discharged to the outlet portion via the turbine wheel. This turbine housing can realize such a function without joining the bypass passage portion to the inner tubular member, so the bypass passage portion is designed without considering the stress concentration at the joint portion between the bypass passage portion and the inner tubular member. become able to. That is, since the restriction in determining the passage area of the bypass passage portion is relaxed, the design freedom of the bypass passage portion can be expanded.

  In one aspect of the turbine housing of the present invention, a flange portion is formed at a tip of the inlet portion, the outer tubular member of the double structure portion is joined to the flange portion on the entire circumference, and the inner tubular portion is formed. The gap may communicate with the inlet portion by separating the member from the flange portion (Claim 2). According to this aspect, since the outer tubular member of the double structure portion is joined to the flange portion all around and the inner tubular member is separated from the flange portion, a gap that opens in an annular shape is formed in the flange portion. Since the inner tubular member is not entirely joined to the flange portion, it is possible to prevent stress concentration from occurring at the joint portion between the inner tubular member and the flange portion.

  In one aspect of the turbine housing of the present invention, the inner tubular member of the double structure portion is composed of two tubular members so that the scroll portion is divided into two regions aligned in the rotation axis direction of the turbine wheel. The bypass passage portion is configured to communicate with the first passage connecting the tubular member closer to the outlet portion of the two tubular members and the outlet portion, and the gap. It may have two passages (Claim 3). This embodiment is configured as a so-called twin scroll type turbine housing, and two tubular members as inner tubular members are arranged inside the outer tubular member. If the bypass passage portion connected to each of the two tubular members is formed, the tubular member closer to the outlet portion becomes an obstacle when the tubular member far from the outlet portion is connected to the outlet portion. It becomes difficult to handle the bypass passage. As a result, there arises a problem that the path of the bypass passage portion becomes long. According to this aspect, the first passage connecting the tubular member on the side close to the outlet portion and the outlet portion, and the second passage configured to communicate with the gap formed between the inner tubular member and the outer tubular member. Therefore, the second passage can be configured without considering the routing of the passage between the tubular member far from the outlet portion and the outlet portion. Thereby, it can prevent easily that the path | route of a bypass channel | path part becomes long. Further, since the configuration of the second passage does not affect the arrangement and shape of the two tubular members, the arrangement and shape of the tubular members can be freely designed.

  In this aspect, a flange portion is formed at the tip of the inlet portion, and the outer tubular member of the double structure portion is joined to the flange portion all around, and the outlet of the two tubular members is formed. A tubular member on the side closer to the portion is joined to at least one of the flange portion or the outer tubular member, and the tubular member on the side farther from the outlet portion of the two tubular members is separated from the flange portion. The gap may communicate with the inlet (claim 4). In this case, since the gap formed between the tubular member on the side close to the outlet and the outer tubular member is closed, gas leakage into the gap can be suppressed. Thereby, it can prevent that the advantage of a twin scroll type turbine housing reduces.

  As described above, according to the present invention, there is no need to join the bypass passage portion to the inner tubular member, so that the bypass passage portion can be formed without considering the stress concentration at the joint portion between the bypass passage portion and the inner tubular member. It becomes possible to design. That is, since the restriction in determining the passage area of the bypass passage portion is relaxed, the degree of freedom in designing the bypass passage portion can be expanded.

(First form)
1 is a view showing a main part of a turbine in which a turbine housing according to a first embodiment of the present invention is incorporated, FIG. 2 is a view showing a state seen from the direction of arrow II in FIG. 1, and FIG. It is sectional drawing regarding the III-III line of 1. FIG. The turbine 1A is incorporated in a turbocharger of an internal combustion engine, and is used to rotationally drive a centrifugal compressor (not shown) using exhaust energy. The turbine 1A includes a turbine wheel 2 and a turbine housing (hereinafter referred to as a housing) 3A that accommodates the turbine wheel 2 and rotatably supports the turbine wheel 2. The turbine wheel 2 is provided with a plurality of turbine blades (not shown) in the circumferential direction.

  The housing 3A includes an inlet portion 4 for introducing gas such as exhaust, a wheel housing portion 5 that houses the turbine wheel 2, a spiral scroll portion 6 that communicates with the inlet portion 4 and extends to the wheel housing portion 5, and a wheel. An outlet portion 7 for discharging the gas that has passed through the housing portion 5, a bypass passage portion 8 that connects the inlet portion 4 and the outlet portion 7 so that the wheel housing portion 5 can be bypassed, and opening and closing that opens and closes the bypass passage portion 8 And a valve 9.

  From the entrance part 4 to the scroll part 6 of the housing 3A, a so-called double structure part 10 is formed. The double structure portion 10 includes an inner tubular member 11 and an outer tubular member 12 having a predetermined shape, and these members 11 and 12 are combined in a state where a gap S is formed. The inner tubular member 11 and the outer tubular member 12 are each made of stainless steel.

  As shown in FIG. 2, a flange portion 15 made of cast iron is formed at the tip of the inlet portion 4, and the outer tubular member 12 is joined to the flange portion 15 by a welding means or the like around the circumference. Yes. On the other hand, the inner tubular member 11 is separated from the flange portion 15 (outer tubular member 12), and the gap S communicates with the inlet portion 4. As a result, the gap S is annularly opened in the flange portion 15. Therefore, the housing 3 </ b> A can introduce gas into the gap S as well as the inside of the inner tubular member 11. As shown in FIG. 3, the bypass passage portion 8 is configured to communicate with the gap S. In other words, the bypass passage 8 is opened to the gap S side through the outer tubular member 12. In this embodiment, the outer tubular member 12 extends to the outlet portion 7 and is entirely joined to a flange portion 16 formed at the tip of the outlet portion 7 by a joining means such as welding.

  With the above configuration, when the on-off valve 9 is held at the position of the solid line in FIG. 3 and the bypass passage portion 8 is opened, the gap S and the bypass passage portion 8 communicate with each other, so that the gas guided to the gap S is bypassed. It is discharged to the exit part 7 via 8. On the other hand, when the on-off valve 9 is held at the position of the imaginary line in FIG. 3 and the bypass passage portion 8 is closed, the pressure difference between the inside and outside of the double structure portion 10 does not occur. It passes through the inner tubular member 11 and is discharged to the outlet portion 7 via the turbine wheel 2. Since the housing 3A can realize such a function without joining the bypass passage portion 8 to the inner tubular member 11, the bypass passage can be performed without considering the stress concentration at the joint portion between the bypass passage portion 8 and the inner tubular member 11. The part 8 can be designed. That is, since the restriction at the time of determining the passage area of the bypass passage portion 8 is relaxed, the design freedom of the bypass passage portion 8 can be expanded. Further, since the inner tubular member 11 is not joined to the flange portion 15 all around, it is possible to prevent stress concentration from occurring at the joint portion between the inner tubular member 11 and the flange portion 15.

(Second form)
Next, a second embodiment of the present invention will be described with reference to FIGS. 4 is a view showing a main part of a turbine in which a turbine housing according to the second embodiment of the present invention is incorporated, FIG. 5 is an enlarged view of a section taken along the line V-V in FIG. 4, and FIG. FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. In addition, about the structure which is common in a 1st form, description is abbreviate | omitted by attaching | subjecting the same referential mark to these figures.

  The turbine 1B according to the second embodiment is used by being incorporated in a turbocharger as in the first embodiment, and includes a turbine housing (hereinafter referred to as a housing) 3B. As is apparent from FIG. 5, the housing 3B is configured as a so-called twin scroll type housing. The housing 3B includes an inlet portion 21 for introducing gas, a wheel accommodating portion 22 that accommodates the turbine wheel 2, a spiral scroll portion 23 that communicates with the inlet portion 21 and extends to the wheel accommodating portion 22, and a wheel accommodating portion. An outlet portion 24 for discharging the gas that has passed through 22, a bypass passage portion 25 that connects the inlet portion 21 and the outlet portion 24 so as to bypass the wheel housing portion 22, and an on-off valve 26 that opens and closes the bypass passage portion 25. And.

  As in the first embodiment, the housing 3B is configured as a double structure portion 27 from the inlet portion 21 to the scroll portion 23. The double structure portion 27 has a predetermined shape and has an inner tubular member 28 and an outer tubular member 29 made of stainless steel, and these members 28 and 29 are in a state in which a gap S is formed. Are combined. The inner tubular member 28 is composed of two tubular members 28A and 28B. As shown in FIG. 5, the tubular members 28 </ b> A and 28 </ b> B divide the scroll portion 23 into two regions AR <b> 1 and AR <b> 2 that are aligned in the rotation axis direction of the turbine wheel 2.

  As shown in FIG. 7, the bypass passage portion 25 includes a first passage 25A that connects the tubular member 28A on the side close to the outlet portion 24 and the outlet portion 24, and a second passage 25B that is configured to communicate with the gap S. have. The first passage 25A passes through the outer tubular member 29 and the tubular member 28A and opens to the tubular member 28A. As shown in FIGS. 6 and 7, a flange portion 30 made of cast iron is formed at the tip of the inlet portion 21. The outer tubular member 29 of the double structure portion 27 is joined to the flange portion 30 all around by a joining means such as welding. The tubular member 28A on the side close to the outlet portion 24 is joined to the outer tubular member 29 by joining means such as welding. The other tubular member 28B is partly separated from the flange portion 30 (outer tubular member 29), and the remaining part is joined to the outer tubular member 29 by joining means such as welding. As a result, the gap S leads to the inlet portion 21. As shown in FIG. 6, the tubular members 28 </ b> A and 28 </ b> B are configured such that their openings are aligned in the rotation axis direction of the turbine wheel 2 (up and down direction in FIG. 6). As shown in FIG. 7, the outer tubular member 29 of the present embodiment extends to the outlet portion 24, and the entire circumference of the outer tubular member 29 is welded to a cast iron flange portion 31 formed at the tip of the outlet portion 24 by welding means or the like. It is joined.

  With the above configuration, when the on-off valve 26 is held at the position of the solid line in FIG. 7 and the first passage 25A and the second passage 25B of the bypass passage portion 25 are opened, the tubular member 28A on the side close to the outlet portion 24 and the first passage The gas guided to the first tubular member 28A is discharged to the outlet 24 via the first passage 25A, and the gas guided to the gap S is connected to the first passage 25A via the second passage 25B. It is discharged to the outlet 24. On the other hand, when the opening / closing valve 26 is held at the position indicated by the imaginary line in FIG. The gas guided to the gas passes through the tubular members 28A and 28B and is discharged to the outlet 24 via the turbine wheel 2.

  According to the second embodiment, as in the first embodiment, the second passage 25B of the bypass passage portion 25 and the tubular member 28B on the side far from the outlet portion 24 are not joined, so the design of the bypass passage portion 25 is free. The degree can be expanded. Further, since the bypass passage portion 25 has two passages 25A and 25B, and the second passage 25B of these passages leads to the gap S, the tubular member 28B far from the outlet portion 24 and the outlet portion 24 The second passage 25B can be configured without considering the handling of the passage between them. Furthermore, since the gap S formed between the tubular member 28A on the side close to the outlet portion 24 and the outer tubular member 29 is blocked by the flange portion 30, gas leakage into the gap S can be suppressed. Thereby, it can prevent that the advantage of a twin scroll type turbine housing reduces.

(Third form)
Next, a third embodiment of the present invention will be described with reference to FIGS. 8 is a view showing a main part of a turbine in which a turbine housing according to a third embodiment of the present invention is incorporated, FIG. 9 is an enlarged view of a section taken along line IX-IX in FIG. 8, and FIG. FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. In addition, about the structure which is common in a 1st form, description is abbreviate | omitted by attaching | subjecting the same referential mark to these figures.

  A turbine 1C according to the third embodiment is used by being incorporated in a turbocharger as in the first embodiment, and includes a turbine housing (hereinafter referred to as a housing) 3C. As is apparent from FIG. 9, the housing 3C is configured as a so-called twin scroll type housing as in the second embodiment. The housing 3C includes an inlet portion 32 for introducing gas, a wheel accommodating portion 33 that accommodates the turbine wheel 2, a spiral scroll portion 34 that communicates with the inlet portion 32 and extends to the wheel accommodating portion 33, and a wheel accommodating portion. An outlet portion 35 for discharging the gas that has passed through 33, a bypass passage portion 36 that connects the inlet portion 32 and the outlet portion 35 so as to bypass the wheel housing portion 33, and an on-off valve 37 that opens and closes the bypass passage portion 36. And.

  Similar to the first and second embodiments, the housing 3 </ b> C is configured as a double structure portion 38 from the inlet portion 32 to the scroll portion 34. The double structure portion 38 has a predetermined shape and has an inner tubular member 39 and an outer tubular member 40 made of stainless steel, and these members 39, 40 are in a state in which a gap S is formed. Are combined. The inner tubular member 39 is composed of two tubular members 39A and 39B. As shown in FIG. 9, the tubular members 39 </ b> A and 39 </ b> B divide the scroll portion 34 into two regions AR <b> 1 and AR <b> 2 aligned in the rotation axis direction of the turbine wheel 2.

  As shown in FIG. 11, the bypass passage portion 36 includes a first passage 36A that connects the tubular member 39A on the side close to the outlet portion 35 and the outlet portion 35, and a second passage 36B that is configured to communicate with the gap S. have. The first passage 36A passes through the outer tubular member 40 and the tubular member 39A on the side close to the outlet portion 35 and opens to the tubular member 39A. A cast iron flange portion 41 is formed at the tip of the inlet portion 32. As shown in FIGS. 10 and 11, the outer tubular member 40 of the double structure portion 38 is joined to the flange portion 41 by a joining means such as welding. The tubular member 39A on the side close to the outlet portion 35 is joined to the outer tubular member 40 by joining means such as welding. The other tubular member 39B is partly separated from the flange portion 41 (outer tubular member 40), and the remaining part is joined to the outer tubular member 40 by a joining means such as welding. As a result, the gap S leads to the inlet portion 32. As shown in FIG. 10, the tubular members 39 </ b> A and 39 </ b> B are configured such that their openings are aligned in a direction (left-right direction in FIG. 10) orthogonal to the rotation axis direction of the turbine wheel 2. That is, as shown in FIG. 11, the tubular members 39 </ b> A and 39 </ b> B are arranged inside the outer tubular member 40 in a state where the tubular members 39 </ b> A and 39 </ b> B are twisted by approximately 90 ° from the inlet portion 32 to the scroll portion 34. In addition, the outer tubular member 40 of this embodiment extends to the outlet portion 35, and is entirely joined to a cast iron flange portion 42 formed at the tip of the outlet portion 35 by a welding means such as welding.

  With the above configuration, when the on-off valve 37 is held at the position of the solid line in FIG. 11 and the first passage 36A and the second passage 36B of the bypass passage portion 36 are opened, the tubular member 39A on the side near the outlet portion 35 and the first passage The gas guided to the first tubular member 39A is discharged to the outlet portion 35 via the first passage 36A, and the gas guided to the gap S is connected to the first passage 36A via the second passage 36B. It is discharged to the outlet part 35. On the other hand, when the on-off valve 37 is held at the position indicated by the imaginary line in FIG. 11 and the passages 36A and 36B of the bypass passage portion 36 are closed, the pressure difference between the inside and outside of the double structure portion 38 does not occur. The gas led to is passed through the tubular members 39A, 39B and is discharged to the outlet portion 35 via the turbine wheel 2.

  According to the 3rd form, the effect equivalent to a 2nd form can be exhibited. That is, since the second passage 36B of the bypass passage portion 36 and the tubular member 39B on the side far from the outlet portion 35 are not joined, the degree of freedom in designing the bypass passage portion 36 can be expanded. Further, since the bypass passage portion 36 has two passages 36A and 36B, and the second passage 36B of these passages leads to the gap S, the tubular member 39B far from the outlet portion 35 and the outlet portion 35 are connected to each other. The second passage 36B can be configured without considering the routing of the passage between them. Furthermore, since the gap S formed between the tubular member 39A near the outlet portion 35 and the outer tubular member 40 is blocked by the flange portion 41, gas leakage into the gap S can be suppressed. Thereby, it can prevent that the advantage of a twin scroll type turbine housing reduces.

  The present invention is not limited to the above embodiments, and can be implemented in various forms within the scope of the gist of the present invention. The turbine housing according to the present invention is not necessarily applied to a turbine incorporated in a turbocharger. Therefore, the turbine housing of the present invention can be applied to a turbine used for some applications.

The figure which showed the principal part of the turbine in which the turbine housing which concerns on the 1st form of this invention was integrated. The figure which showed the state seen from the direction of arrow II of FIG. Sectional drawing regarding the III-III line of FIG. The figure which showed the principal part of the turbine in which the turbine housing which concerns on the 2nd form of this invention was integrated. The figure which expanded the cross section regarding the VV line | wire of FIG. The figure which showed the state seen from the direction of arrow VI of FIG. Sectional drawing regarding the VII-VII line of FIG. The figure which showed the principal part of the turbine in which the turbine housing which concerns on the 3rd form of this invention was integrated. The figure which expanded the cross section regarding the IX-IX line of FIG. The figure which showed the state seen from the direction of the arrow X of FIG. Sectional drawing regarding the XI-XI line of FIG.

Explanation of symbols

2 Turbine wheel 3A-3C Turbine housing 4 Inlet part 5 Wheel accommodating part 6 Scroll part 7 Outlet part 8 Bypass passage part 10 Duplex structure part 11 Inner tubular member 12 Outer tubular member 15 Flange part 21 Inlet part 22 Wheel accommodating part 23 Scroll Portion 24 Exit portion 25 Bypass passage portion 25A First passage 25B Second passage 27 Dual structure portion 28 Inner tubular members 28A, 28B Tubular member 29 Outer tubular member 30 Flange portion 32 Inlet portion 33 Wheel accommodating portion 34 Scroll portion 35 Outlet portion 36 Bypass passage portion 36A First passage 36B Second passage 38 Dual structure portion 39 Inner tubular members 39A, 39B Tubular member 40 Outer tubular member 41 Flange portion S Clearance AR1, AR2 region

Claims (4)

An inlet portion for introducing gas, a wheel accommodating portion for accommodating a turbine wheel, a spiral scroll portion that communicates with the inlet portion and extends to the wheel accommodating portion, and discharges the gas that has passed through the wheel accommodating portion. And a bypass passage portion connecting the inlet portion and the outlet portion so as to be able to bypass the wheel housing portion, the inner tubular member and the outer tubular member extending from the inlet portion to the scroll portion. In a turbine housing configured as a double structure in which a gap is formed between
The double structure portion is configured such that gas can be introduced when the gap communicates with the inlet portion, and the bypass passage portion is configured to communicate with the gap of the double structure portion. Turbine housing.   A flange portion is formed at a distal end of the inlet portion, the outer tubular member of the double structure portion is joined to the flange portion all around, and the inner tubular member is separated from the flange portion, thereby The turbine housing according to claim 1, wherein a gap communicates with the inlet portion.   The inner tubular member of the double structure portion is composed of two tubular members so that the scroll portion is divided into two regions aligned in the rotational axis direction of the turbine wheel, and the bypass passage portion is And a first passage connecting the tubular member closer to the outlet portion of the two tubular members and the outlet portion, and a second passage configured to communicate with the gap. The turbine housing according to claim 1.   A flange portion is formed at the distal end of the inlet portion, and the outer tubular member of the double structure portion is joined to the flange portion on the entire circumference, and the side closer to the outlet portion of the two tubular members. When the tubular member is joined to at least one of the flange portion or the outer tubular member, and the tubular member on the side farther from the outlet portion of the two tubular members is separated from the flange portion, the gap becomes the inlet. The turbine housing according to claim 3, wherein the turbine housing communicates with the portion.

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