WO2015045541A1

WO2015045541A1 - Compressor and supercharger

Info

Publication number: WO2015045541A1
Application number: PCT/JP2014/067415
Authority: WO
Inventors: 泰治手塚; 中村　敏夫
Original assignee: 三菱重工業株式会社
Priority date: 2013-09-25
Filing date: 2014-06-30
Publication date: 2015-04-02
Also published as: EP3173630B1; KR20160023893A; EP3009633B1; KR101799707B1; EP3009633A4; CN107701298A; JP6097188B2; EP3009633A1; CN107701298B; CN105531460A; EP3173630A1; JP2015063956A

Abstract

The purpose of the present invention is to provide a compressor and a supercharger, the compressor and the supercharger being configured to effectively prevent the breakage of bolts for fastening together a scroll chamber frame and frames which are adjacent to the scroll chamber frame, thereby enabling the frames to be consistently joined together. A compressor (10) has: an impeller (14) for compressing air; an air guide cylinder (16) for housing the impeller (14) and guiding air; a scroll chamber frame (20) provided adjacent to the air guide cylinder (16) and forming a scroll chamber (18) for guiding the air, which has passed through the air guide cylinder (16), to the outside; frames (22, 40) provided adjacent to the scroll chamber frame (20); bolts (25, 48) for fastening the scroll chamber frame (20) and the frames (22, 40) together; and spacers (28) provided between the heads (26, 52) of the bolts (25, 48) and the scroll chamber frame (20).

Description

Compressor and turbocharger

The present invention relates to a compressor and a supercharger used for an internal combustion engine.

Conventionally, as a supercharger for compressing air supplied to an internal combustion engine, an impeller for compressing air, an air guide cylinder for containing the impeller and guiding air, and an air guide cylinder are provided adjacent to the air guide cylinder. And a compressor including a scroll chamber frame that forms a scroll chamber for guiding the air that has passed through the air guide cylinder to the outside.
In the turbocharger described in Patent Document 1, when a part of the impeller bursts and scatters outward, the head tank of the lubricating oil for lubricating the journal bearing is not damaged and oil leakage does not occur. In addition, an impact absorbing partition wall is provided between the diffuser of the compressor and the head tank.

JP 2001-132465 A

By the way, when the impeller breaks in the compressor constituting a part of the supercharger, the impeller fragments may scatter toward the outer side in the radial direction of the impeller, and may collide with the air guide cylinder, the surrounding frame, or the like. When impeller fragments collide with the air guide cylinder or surrounding frame, tensile stress is generated in the bolt for fastening the scroll chamber frame adjacent to the air guide cylinder and the frame adjacent to the scroll chamber frame, and the bolt breaks. There was a possibility.
In this regard, Patent Document 1 describes a configuration for preventing the lubricant head tank from being damaged when a part of the impeller is scattered as described above, but the bolt is caused by the scattering of the impeller. Is not disclosed at all about the problem of breakage and the solution.

An object of some embodiments of the present invention is to effectively suppress breakage of bolts that fasten a frame adjacent to a scroll chamber frame and the scroll chamber frame, and realize a stable coupling state of these frames. It is to provide a compressor and a supercharger capable of

A compressor according to some embodiments of the present invention includes:
(1) an impeller for compressing air;
An air guide tube for accommodating the impeller and guiding the air;
A scroll chamber frame provided adjacent to the air guide tube and forming a scroll chamber for guiding the air that has passed through the air guide tube to the outside;
A first frame provided adjacent to the scroll chamber frame;
A first bolt that fastens the scroll chamber frame and the first frame;
A spacer provided between the head of the first bolt and the scroll chamber frame;
Have

When the impeller breaks in the compressor, the impeller fragments may scatter toward the outside in the radial direction of the impeller, and may collide with the air guide tube or the surrounding frame. When impeller fragments collide with the air guide cylinder or the surrounding frame, tensile stress is generated in the first bolt for fastening the scroll chamber frame adjacent to the air guide cylinder and the first frame adjacent to the scroll chamber frame, The first bolt could break.

On the other hand, according to the compressor described in (1) above, since the spacer is provided between the head of the first bolt and the scroll chamber frame, the shaft is compared with the case where no spacer is provided. The scroll chamber frame and the first frame can be fastened using a first bolt having a long portion (length under the neck). Therefore, compared with the case where a spacer is not provided, when the axial load is applied to the first bolt, the amount of extension that can be extended without breaking the first bolt can be increased. Thereby, even if the tensile stress resulting from the fracture | rupture of an impeller arises with respect to the 1st volt | bolt which fastens a scroll chamber frame and a 1st flame | frame as mentioned above, the fracture | rupture of a 1st volt | bolt is suppressed effectively. Can do. That is, a stable coupling state between the scroll chamber frame and the first frame can be realized.

Further, in order to manufacture the compressor described in (1) above, it is only necessary to add a spacer and replace the first bolt with respect to an existing compressor without procuring all the new components. . That is, the compressor described in (1) also has an advantage from the viewpoint of ease of production.
The “first frame” in the compressor described in (1) is used to include at least the silencer frame and the bearing frame described in the embodiment for carrying out the invention. In the compressor described in (1) above, when the first bolt is a stud bolt, the head of the first bolt means a nut used for the stud bolt.

In some embodiments, in the compressor described in (1) above,
(2) The spacer is formed in a sleeve shape so as to surround the shaft portion of the first bolt,
The inner diameter of the spacer is smaller than the head diameter of the first bolt.

According to the compressor described in (2) above, since the head of the first bolt can be uniformly supported by the sleeve-like spacer provided so as to surround the shaft portion of the first bolt, the impeller as described above. Even if the tensile stress resulting from the breaking of the first bolt is generated, the breaking of the first bolt can be effectively suppressed. Therefore, a stable coupling state between the scroll chamber frame and the first frame adjacent to the scroll chamber can be realized.

In some embodiments, in the compressor according to (1) or (2) above,
(3) The dimension of the spacer in the axial direction of the first bolt is larger than the dimension of the spacer in the radial direction of the first bolt.

By using a spacer suitable for increasing the length of the shaft portion of the first bolt as in the compressor described in (3) above, the first bolt is subjected to a tensile load in the axial direction. It is possible to easily increase the amount of extension that can be extended without breaking one bolt.

Thereby, even if the tensile stress resulting from the fracture | rupture of an impeller arises with respect to the 1st volt | bolt which fastens a scroll chamber frame and a 1st flame | frame as mentioned above, the fracture | rupture of a 1st volt | bolt is suppressed effectively. Can do. Therefore, a stable coupling state between the scroll chamber frame and the first frame adjacent to the scroll chamber frame can be realized.

In some embodiments, in the compressor described in any one of (1) to (3) above,
(4) further comprising a silencer for reducing the sound generated by the compressor;
The first frame is a frame of the silencer.

According to the compressor described in (4), even if the tensile stress resulting from the breakage of the impeller is generated on the first bolt that fastens the frame of the silencer and the scroll chamber frame, the first bolt Can be effectively suppressed. Therefore, it is possible to effectively prevent the silencer from dropping from the compressor.

In some embodiments, in the compressor according to any one of (1) to (4) above,
(5) a second frame disposed adjacent to the scroll chamber frame;
A second bolt for fastening the scroll chamber frame and the second frame;
A clamp configured to sandwich the scroll chamber frame and the second frame.

When the impeller breaks in the compressor, the impeller fragments may scatter toward the outside in the radial direction of the impeller, and may collide with the air guide cylinder or the scroll chamber frame. When impeller fragments collide with the air guide cylinder or the scroll chamber frame, a tensile stress is generated in the second bolt for fastening the second frame and the scroll chamber frame adjacent to the scroll chamber frame, and the second bolt There was a possibility of breaking.
On the other hand, according to the compressor as described in said (5), it is suppressed that a tensile stress arises in a 2nd volt | bolt with the clamp comprised so that a scroll chamber frame and a 2nd frame may be pinched | interposed, and a 2nd volt | bolt. Can be effectively suppressed. Therefore, a stable coupling state between the scroll chamber frame and the second frame adjacent to the scroll chamber frame can be realized.
The “second frame” in the compressor described in (5) above is used to include at least the silencer frame and the bearing frame described in the embodiment for carrying out the invention.

In some embodiments, in the compressor described in (5) above,
(6) The second frame is a bearing frame provided with a bearing portion that pivotally supports a rotating shaft of the impeller.

According to the compressor described in (6) above, even if tensile stress resulting from breakage of the impeller occurs as described above with respect to the second bolt that fastens the scroll chamber frame and the bearing frame, Breakage can be effectively suppressed. Therefore, a stable coupling state between the scroll chamber frame and the bearing frame can be realized.

In some embodiments, in the compressor described in (6) above,
(7) The scroll chamber frame is
A scroll chamber forming portion for forming the scroll chamber;
A flange portion extending radially outward of the impeller from the scroll chamber forming portion to couple the scroll chamber frame and the bearing frame;
Have
The second bolt fastens the flange portion and the bearing frame;
The clamp is configured to sandwich the flange portion and the bearing frame.

In the configuration in which the flange portion extending from the scroll chamber forming portion toward the radially outer side of the impeller and the bearing frame are coupled, it is difficult to secure a space between the flange portion and the scroll chamber forming portion, and the second bolt It may be difficult to provide a spacer between the head of the second bolt and the scroll chamber frame to prevent breakage.

Even in such a case, according to the compressor described in the above (7), it is possible to suppress the tensile stress from being generated in the second bolt by the clamp configured to sandwich the scroll chamber frame and the bearing frame, The breakage of the second bolt can be effectively suppressed. Therefore, a stable coupling state between the scroll chamber frame and the bearing frame can be realized.

In some embodiments, in the compressor described in (7) above,
(8) The clamp includes a push bolt that applies a pressing force to the bearing frame from a side opposite to the flange portion of the scroll chamber frame.

Even in such a case, as in the compressor described in (8) above, if a push bolt that applies a pressing force to the bearing frame from the side opposite to the flange portion of the scroll chamber frame is provided, the second It is possible to suppress the tensile stress from being generated in the bolt with a simple configuration and to effectively suppress the breakage of the second bolt. Therefore, a stable coupling state between the scroll chamber frame and the bearing frame can be realized with a simple configuration.

(9) A supercharger according to some embodiments of the present invention includes the compressor according to any one of (1) to (8).
In the supercharger according to some embodiments of the present invention, even if tensile stress due to impeller breakage occurs, breakage of the first bolt can be effectively suppressed. That is, a stable coupling state between the scroll chamber frame and the first frame can be realized.

According to some embodiments of the present invention, it is possible to effectively suppress breakage of bolts that fasten a frame adjacent to a scroll chamber frame and the scroll chamber frame, and realize a stable coupling state of these frames. Can do.

1 is a schematic diagram illustrating an overall configuration of an internal combustion engine system according to some embodiments. It is a schematic sectional drawing of a part of the supercharger which concerns on some embodiment. It is a schematic sectional drawing of the periphery of the volt | bolt which fastens a scroll chamber frame and a silencer frame. It is a figure which shows the state which the tensile force was produced in the volt | bolt which a scroll chamber frame deform | transforms and fastens a scroll chamber frame and a bearing frame. The figure which looked at the flange part of the scroll chamber frame and the flange part of the bearing frame from the P direction in FIG. It is a schematic sectional drawing for demonstrating the structure of the clamp which concerns on some embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

FIG. 1 is a schematic diagram illustrating an overall configuration of an internal combustion engine system 100 according to some embodiments.
An internal combustion engine system 100 shown in FIG. 1 includes an internal combustion engine 2, a supercharger 4 that pressurizes intake air to the internal combustion engine 2, and a generator 8 that is driven by a turbine 6 that the supercharger 4 has.

A supercharger 4 shown in FIG. 1 is connected to a centrifugal compressor (compressor) 10 that pressurizes intake air to the internal combustion engine 2, and the compressor 10 via a rotary shaft 12 and is driven by exhaust gas from the internal combustion engine 2. A turbine 6 and a silencer 13 for reducing sound generated by the compressor 10 are provided.

The turbocharger 4 shown in FIG. 1 uses an exhaust turbine type supercharger (so-called turbocharger) that drives the compressor 10 by the turbine 6 driven by the exhaust gas of the internal combustion engine 2 as described above. In the supercharger 4 according to another embodiment, a mechanical supercharger (so-called supercharger) that drives the compressor 10 by power extracted from the output shaft of the internal combustion engine 2 via a belt or the like may be used. As the internal combustion engine 2, for example, a diesel engine or a gasoline engine can be selected as appropriate.

Next, a specific configuration example of the supercharger 4 will be described below with reference to FIG.

FIG. 2 is a schematic cross-sectional view of a part of the supercharger 4 according to some embodiments.
The compressor 10 shown in FIG. 2 includes an impeller 14 for compressing air, an air guide cylinder 16 for housing the impeller 14 and guiding air, a scroll chamber frame 20, and a bearing frame 40. The impeller 14 includes a hub 15 and a plurality of wings 17 provided around the hub 15. The scroll chamber frame 20 is provided adjacent to the air guide tube 16 and has a scroll chamber forming portion 19 that forms a scroll chamber 18 for guiding the air that has passed through the air guide tube 16 to the outside. The bearing frame 40 is provided with a bearing portion 44 that supports the rotating shaft 12 of the impeller 14.

The silencer 13 includes a silencer frame 22 provided adjacent to the scroll chamber frame 20. In the scroll chamber frame 20 and the silencer frame 22, a flange portion 23 of the scroll chamber frame 20 and a flange portion 24 of the silencer frame 22 are fastened by bolts 25. A spacer 28 (see FIG. 3) is provided between the head 26 of the bolt 25 and the scroll chamber frame 20.

The bearing frame 40 and the scroll chamber frame 20 are fastened to the flange portion 46 of the bearing frame 40 and the flange portion 29 of the scroll chamber frame 20 by bolts 48.

When the impeller 14 breaks in the compressor 10 constituting a part of the turbocharger 4 shown in FIG. There is a case.

For example, when impeller fragments collide with the inclined portion 30 of the air guide tube 16, the entrance portion 32 of the air guide tube 16 moves in the direction of arrow S (see FIG. 3) toward the silencer 13 due to the impact, and the silencer frame. It collides with the exit part 43 of 22. As a result, the flange portion 24 of the silencer frame 22 tends to move away from the flange portion 23 of the scroll chamber frame 20, and tensile stress is generated in the bolt 25.

Even when tensile stress is generated in the bolt 25 as described above, according to the compressor 10 and the supercharger 4, the spacer 28 is provided between the head portion 26 of the bolt 25 and the scroll chamber frame 20. As compared with the case where the spacer 28 is not provided, the scroll chamber frame 20 and the silencer frame 22 are fastened by using the bolt 25 having a long shaft portion 31 (see FIG. 3) (the length under the neck). Can do. Therefore, as compared with the case where the spacer 28 is not provided, when the axial load is applied to the bolt 25, the extension amount that the bolt 25 can extend without breaking is increased. Thereby, even if the tensile stress resulting from the fracture | rupture of the impeller 14 arises with respect to the volt | bolt 25 which fastens the scroll chamber frame 20 and the silencer frame 22, as mentioned above, the fracture | rupture of the volt | bolt 25 is suppressed effectively. Can do. Therefore, the scroll chamber frame 20 and the silencer frame 22 can be stably coupled, and the silencer 13 can be effectively prevented from falling off from the supercharger 4 and the compressor 10.

The spacer 28 shown in FIG. 3 is formed in a sleeve shape so as to surround the shaft portion 31 of the bolt 25, and the inner diameter d _{1 of the} spacer 28 is smaller than the diameter d ₂ of the head portion 26 of the bolt 25. . Therefore, since the head portion 26 of the bolt 25 can be uniformly supported by the spacer 28, even if the tensile stress resulting from the breakage of the impeller 14 is generated in the bolt 25 as described above, the breakage of the bolt 25 is effectively suppressed. be able to.

Further, the dimension d ₃ of the spacer 28 in the axial direction of the bolt 25 shown in FIG. 3 is larger than the dimension d ₄ of the spacer 28 in the radial direction of the bolt 25. In this manner, by using the spacer 28 suitable for increasing the length of the shaft portion 31 of the bolt 25, the bolt 25 can be extended without breaking when the bolt 25 is subjected to an axial tensile load. The amount can be easily increased. Thereby, even if the tensile stress resulting from the fracture | rupture of the impeller 14 arises with respect to the volt | bolt 25 which fastens the scroll chamber frame 20 and the silencer frame 22, as mentioned above, the fracture | rupture of the volt | bolt 25 is suppressed effectively. Can do.

In FIG. 3, an example in which tensile stress is generated due to the breakage of the impeller 14 in the bolt 25 that fastens the scroll chamber frame 20 and the silencer frame 22 is described. 48, a tensile stress may be generated due to the breakage of the impeller 14.

For example, when an impeller fragment enters the diffuser unit 50 of FIG. 2 and is caught by the diffuser unit 50, the diffuser unit 50 is pushed and expanded in the axial direction of the impeller 14 by the impeller fragment. As a result, the scroll chamber frame 20 and the bearing frame receive forces in directions away from each other, so that the scroll chamber frame 20 is deformed and tensile stress is generated in the bolts 48 as shown in FIG.

In order to prevent the bolt 48 from being broken by this tensile stress, in some embodiments, the spacer 48 described with reference to FIG. 3 is provided between the head 52 of the bolt 48 and the scroll chamber frame 20. The shaft portion 53 may be longer than that shown in FIG. However, as shown in FIG. 2, since the flange portion 29 of the scroll chamber frame 20 extends from the scroll chamber forming portion 19 toward the radially outer side of the impeller 14, the flange portion 29 and the scroll chamber forming portion 19 are provided. It is difficult to secure a space between the bolt 48 and it may be difficult to provide a spacer between the head 52 of the bolt 48 and the scroll chamber frame 20 in order to prevent the bolt 48 from being broken.

Therefore, the supercharger 4 and the compressor 10 shown in FIG. 2 have a clamp 54 configured to sandwich the scroll chamber frame 20 and the bearing frame 40 as shown in FIGS. FIG. 5 is a view of the flange portion 29 of the scroll chamber frame 20 and the flange portion 46 of the bearing frame 40 viewed from the direction P in FIG. 2, and shows the arrangement of the bolts 48 and the clamps 54. FIG. 6 is a schematic cross-sectional view for explaining the structure of the clamp 54.

Thus, by using the clamp 54 configured to sandwich the flange portion 29 of the scroll chamber frame 20 and the flange portion 46 of the bearing frame 40, the spacer described above is interposed between the flange portion 29 and the scroll chamber forming portion 19. Even in a configuration in which it is difficult to secure a sufficient space for providing the bolt 48, it is possible to suppress the tensile stress from being generated in the bolt 48 and to effectively prevent the bolt 48 from breaking. Therefore, the scroll chamber frame 20 and the bearing frame 40 can be stably coupled.

The clamp 54 shown in FIGS. 5 and 6 has a push bolt 56 that applies a pressing force to the bearing frame 40 from the side opposite to the flange portion 29 of the scroll chamber frame 20. Thereby, even if it is difficult to provide a spacer between the head portion 52 of the bolt 48 and the scroll chamber frame 20 for the purpose of preventing the breakage of the bolt 48, tensile stress is generated in the bolt 48. This can be suppressed with a simple configuration, and the breakage of the bolt 48 can be effectively suppressed. Therefore, the scroll chamber frame 20 and the bearing frame 40 can be stably coupled with a simple configuration. In another embodiment, a push bolt that applies a pressing force to the flange portion 29 of the scroll chamber frame 20 from the side opposite to the bearing frame 40 may be used.
In the embodiment described with reference to FIG. 6, the clamp 54 configured to sandwich the scroll chamber frame 20 and the bearing frame 40 is illustrated. However, in another embodiment, the scroll chamber frame 20 and the silencer frame 22 are sandwiched. A configured clamp may be used. Thereby, the scroll chamber frame 20 and the silencer frame 22 can be stably coupled.

2 Internal combustion engine 4 Supercharger 6 Turbine 8 Generator 10 Compressor 12 Rotating shaft 13 Silencer 14 Impeller 16 Air guide cylinder 17 Blade 18 Scroll chamber 19 Scroll chamber forming part 20 Scroll chamber frame 22 Silencer frames 23, 24, 29, 46

Flange Portions

25, 48

Bolts

26, 52 Head 28 Spacer 30 Inclined portion 31 Shaft portion 32 Entrance portion 40 Bearing frame 43 Exit portion 44 Bearing portion 50 Diffuser portion 54 Clamp 56 Push bolt 100 Internal combustion engine system d1 Inner diameter d2 Diameter d3, d4 Dimensions

Claims

An impeller for compressing air;
An air guide tube for accommodating the impeller and guiding the air;
A scroll chamber frame provided adjacent to the air guide tube and forming a scroll chamber for guiding the air that has passed through the air guide tube to the outside;
A first frame provided adjacent to the scroll chamber frame;
A first bolt that fastens the scroll chamber frame and the first frame;
A spacer provided between the head of the first bolt and the scroll chamber frame;
Having a compressor.
The spacer is formed in a sleeve shape so as to surround the shaft portion of the first bolt,
The compressor according to claim 1, wherein an inner diameter of the spacer is smaller than a head diameter of the first bolt.
The compressor according to claim 1 or 2, wherein the dimension of the spacer in the axial direction of the first bolt is larger than the dimension of the spacer in the radial direction of the first bolt.
A silencer for reducing noise generated by the compressor;
The compressor according to any one of claims 1 to 3, wherein the first frame is a frame of the silencer.
A second frame disposed adjacent to the scroll chamber frame;
A second bolt for fastening the scroll chamber frame and the second frame;
The compressor according to any one of claims 1 to 4, further comprising a clamp configured to sandwich the scroll chamber frame and the second frame.
The compressor according to claim 5, wherein the second frame is a bearing frame provided with a bearing portion that pivotally supports a rotating shaft of the impeller.
The scroll chamber frame is
A scroll chamber forming portion for forming the scroll chamber;
A flange portion extending radially outward of the impeller from the scroll chamber forming portion to couple the scroll chamber frame and the bearing frame;
Have
The second bolt fastens the flange portion and the bearing frame;
The compressor according to claim 6, wherein the clamp is configured to sandwich the flange portion and the bearing frame.
The compressor according to claim 7, wherein the clamp has a push bolt that applies a pressing force to the bearing frame from a side opposite to the flange portion of the scroll chamber frame.
A supercharger comprising the compressor according to any one of claims 1 to 8.