JPH04125633U - Turbocharger compressor casing - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the casting cost and processing effort of a compressor casing having a return flow path. [Structure] Casing body 1 forming air intake port 6, scroll outer peripheral wall 16, and part of scroll inner peripheral wall 17
9, and the casing body 19 is provided with a diffuser wall 2.
0, the remaining portion of the scroll inner circumferential wall 17, and the air intake passage 7
A substantially ring-shaped diffuser wall component 23 that forms part of the casing body 19 and the outer peripheral surface of the return flow path 14 is fitted, and the remaining portion of the air intake path 7 is fitted into the casing body 19 and the diffuser wall component 23. The substantially cylindrical air suction passage wall constituent member 23 forming the inner peripheral surface of the return flow passage 14 is fitted, and the casing body 19 and the diffuser wall constituent member 23 are connected to the air suction passage wall constituent member 29. Return flow path 1
form 4.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a compressor casing for a turbocharger. .

0002

[Conventional technology]

In general, a turbocharger refers to the exhaust gas 2 of an engine 1, as shown in Figure 3. By rotating the turbine 3, the compressor 4, which is coaxial with the turbine 3, is driven. The compressed air 5 is compressed and the compressed air 5 is sucked into the engine 1. It is.

0003 As shown in FIG. 4, the compressor 4 has an air intake port 6 and an air intake port 6. An air suction passage 7 extending from the inlet 6 as a starting end, and a radial direction extending from the terminal end of the air suction passage 7. The expanding diffuser 8 and the outer periphery of the air intake passage 7 are removed from the outer periphery of the diffuser 8. It is formed by integral casting to sequentially define a scroll 9 extending in a winding manner. A compressor fan wheel is installed inside the air suction passage 7 of the compressor casing 10 made of cast metal. 11 is rotatably housed, and the compressor fan 11 is rotationally driven by the turbine 3. Then, the air 5 is sucked into the air suction path 7 from the air suction port 6, and the air 5 is sucked into the air suction path 7. After the air 5 drawn into 7 passes through the diffuser 8 and is increased in pressure, the air 5 is The signal is sent to the engine 1 via the cable 9.

0004 In such a compressor 4, in a low flow area where the intake amount of air 5 is small, The air 5 whose pressure has been increased by the diffuser 8 is transferred to the air suction passage 7 and the compressor fan 1. Low-pitched vibrations called surging are produced by backflowing through the gap between 1 and 1. To prevent this type of surging from occurring or to remove areas where surging occurs. In order to shift it to the lower flow rate region, conventionally, when casting the compressor casing 10, , a ring-shaped ring opening at the periphery of the air intake port 6 and extending to surround the air intake passage 7; A space 12 is formed, and air is supplied to the cast compressor casing 10. A ring-shaped groove 13 (or is called casing treatment. A return flow path 14 is formed so that the air 5 flowing backward is released from the return flow path 14. Was.

[0005] In addition, in the figure, 15 indicates a plurality of holes in the ring-shaped space 12 of the compressor casing 10 in the circumferential direction. In addition, the return flow path 14 prevents reverse flow when surging occurs. The incoming air 5 is released, but when surging is not occurring, the air 5 is sucked in.

[0006]

[Problem that the idea aims to solve]

However, the compressor casing of the conventional turbocharger mentioned above has , there were the following problems.

[0007] That is, the compressor has a complicated shape having a ring-shaped space 12 for forming the return flow path 14. Since the compressor casing 10 was formed by integral casting, the compressor casing The cost of casting G10 was high.

[0008] Additionally, a cast compressor casing 10 is used to form the return passage 14. On the other hand, a ring-shaped structure is formed so as to communicate from the air intake passage 7 side to the inner part of the ring-shaped space 12. Since groove 13 (or multiple drilled holes) had to be cut, the processing It took a lot of effort.

[0009] In view of the above-mentioned circumstances, this invention is designed to reduce casting costs and processing effort. To provide a compressor casing for a turbocharger having a return flow path. The purpose is to

0010

[Means to solve the problem]

This invention surrounds the air inlet, the air intake path, the diffuser, and the outer periphery of the air intake path. The scroll is defined in order from the periphery of the air intake port to the middle of the air intake passage. For the compressor casing of a turbocharger, which has a return flow path that communicates with the forming an air inlet, an outer circumferential wall of the scroll, and a part of the inner circumferential wall of the scroll. A casing body is provided, and a diffuser wall and a scroll inner circumference are provided in the casing body. Approximately a ring forming the remainder of the wall and part of the air intake channel and the outer circumferential surface of the return channel A diffuser wall component having a shape is fitted to connect the casing body and the diffuser. The wall component has a substantially circular shape that forms the remaining part of the air intake passage and the inner circumferential surface of the return passage. The casing body and diffuser are assembled by fitting together the cylindrical air suction passage wall components. A return passage is formed between the wall constituent member and the air suction passage wall constituent member. This applies to the compressor casing of the turbocharger.

[0011]

[Effect]

According to the present invention, the compressor casing is made of a relatively simple shaped casing book. The casing is divided into three parts: the body, the diffuser wall component, and the air intake path component. Total casting cost for the main body, diffuser wall components, and air intake passage components becomes cheaper.

0012 Inserting the air suction passage component into the casing body and the diffuser wall component Since a return flow path was formed between these by No need for processing etc.

[0013]

【Example】

Embodiments of the present invention will be described below with reference to the drawings.

[0014] 1 and 2 show an embodiment of the present invention.

[0015] In addition, the diagram shows the basic configuration and each configuration of the turbocharger compressor casing. Some of the details of the parts include those similar to those shown in Figures 3 and 4, so Identical components will be given the same reference numerals and explanations will be omitted. Hereinafter, only the configuration specific to the present invention will be explained.

[0016] Air intake port 6, scroll outer peripheral wall 16, and scroll inner peripheral wall 17 The casing body 19 integrally forms the continuous portion 18 with the scroll outer peripheral wall 16. will be established.

[0017] Further, the diffuser wall 20 and the diffuser wall 20 of the scroll inner peripheral wall 17 and the continuous portion 22 of the air intake passage 7 with the diffuser wall 20. A ring-shaped diffuser wall component 23 is provided which is integrally formed.

[0018] The scroll outer peripheral wall 1 of the scroll inner peripheral wall 17 is attached to the casing body 19. A fitting hole 24 is formed that communicates the end of the continuous portion 18 with the air intake port 6, and , extending in the circumferential direction from the end of the diffuser wall component 23 on the opposite diffuser wall side 20. A fitting convex portion 25 is provided in a protruding manner so as to fit into the fitting hole 24 of the casing body 19. The fitting convex portion 25 of the user wall component 23 is fitted internally by shrink fitting, cold fitting, or the like.

[0019] Furthermore, a continuous portion 26 with the air intake port 6 of the air intake passage 7 is formed on the inner circumference, and a continuous portion 26 is formed on the outer circumference. The air inlet 6 of the casing body 19 and the diffuser wall component 23 are fitted into the casing body 19. There is a gap between the inner surface of the mating convex portion 25 and the end of the continuous portion 22, and the outer periphery Air intake ports 6 and a diffuser wall of the casing main body 19 are provided at multiple locations in the circumferential direction. Can be supported in contact with the inner surface of the fitting convex portion 25 of the component 23 and the end portion of the continuous portion 22 A substantially cylindrical air suction passage forming member 29 having flexible ribs 28 is provided.

[0020] The ribs 27 are attached to the casing body 19 at multiple locations in the circumferential direction.

[0021] Fitting of the air inlet 6 of the casing body 19 and the diffuser wall component 23 The air suction passage forming member 29 is fitted onto the inner surface of the mating convex portion 25 by shrink fitting, cold fitting, etc. The casing body 19 and the diffuser wall constituent member 23 are fitted into the air suction passage structure. A return flow path 14 is formed between the forming member 29 and the forming member 29 .

[0022] As described above, the compressor casing 10 is configured.

[0023] Next, the effect will be explained.

[0024] In the process of using engine exhaust gas to turn a turbine and drive a compressor. Since this is the same as in FIGS. 3 and 4, the explanation will be omitted.

[0025] According to the present invention, the compressor casing 10 is connected to the casing main body 19 and the differential. Since it has a three-part structure consisting of the user wall component 23 and the air suction path component 29, the case between the main body 19, the diffuser wall component 23, and the air suction path component 29. The shape of the compressor casing 10 is simpler than that of a one-piece compressor casing 10, and therefore, The casing body 19, the diffuser wall component 23, the air suction path component 29, and The total casting cost is compared to the casting cost of the one-piece compressor casing 10. All prices are low.

[0026] Also, the fitting of the air inlet 6 of the casing body 19 and the diffuser wall component 23 By fitting the air suction path forming member 29 into the inner surface of the mating convex portion 25, the case can be closed. Between the sing body 19, the diffuser wall component 23, and the air suction path component 29, Since the return flow path 14 is formed in between, the return flow path 14 is 14, the cast compressor casing 10 is A ring-shaped groove 13 (or This eliminates the need for cutting multiple drilled holes.

[0027] Note that the present invention is not limited to the above-mentioned embodiment, and the ribs 28 are Other main points of the present invention include that it may be provided on the user wall component 23 side. Of course, various changes can be made within the scope of the invention.

[0028]

[Effect of the idea]

As explained above, the compressor casing of the turbocharger of the present invention According to this method, the following excellent effects can be achieved.

[0029] (1) The compressor casing is connected to the casing body, which has a relatively simple shape, and the The casing body is divided into three parts: the fuser wall component and the air suction path component. The total casting cost of diffuser wall components and air intake passage components can be reduced to a lower price. can be converted into

[0030] (2) Fit the air intake passage component into the casing body and diffuser wall component. A return flow path was formed between these by inserting the It is possible to eliminate the need for cutting work etc. later.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is a view taken along arrow II-II in FIG. 1;

FIG. 3 is a principle diagram of a conventional turbocharger.

FIG. 4 is a side sectional view of the compressor casing in FIG. 3;

[Explanation of symbols]

6 Air intake port 7 Air intake path 8 Diffuser 9 Scroll 10 Compressor casing 14 Return flow path 16 Scroll outer peripheral wall 17 Scroll inner peripheral wall 19 Casing body 20 Diffuser wall 23 Diffuser wall component 29 Air suction passage wall component

Claims (1)

[Scope of utility model registration request] Claim 1: A return flow path that sequentially defines an air intake port, an air intake passage, a diffuser, and a scroll surrounding the outer periphery of the air intake passage, and communicates from the peripheral portion of the air intake opening to an intermediate portion of the air intake passage. In a compressor casing for a turbocharger, a casing body is provided that forms an air inlet, an outer circumferential wall of the scroll, and a part of the inner circumferential wall of the scroll, and the casing body has a diffuser wall, the remaining part of the inner circumferential scroll wall, and an air inlet. A substantially ring-shaped diffuser wall component forming a part of the passage and the outer peripheral surface of the return passage is fitted, and the remaining part of the air intake passage and the return passage are fitted onto the casing body and the diffuser wall component. A return flow path is formed between the casing body and the diffuser wall component and the air suction channel wall component by fitting a substantially cylindrical air intake channel wall component that forms the inner peripheral surface of the casing body and the diffuser wall component. A turbocharger compressor casing featuring: