JPS6241998A - Compressor for supercharger - Google Patents

Abstract

PURPOSE:To eliminate use of any core in casting a housing and to make air feed smooth by constituting a scroll chamber from a scroll groove in the housing body and a bent projection on a lid, and by forming this bent projection and a continuing part from said groove in a curvature. CONSTITUTION:A lid 5b covering an opening 11 provided in the housing body 5a is formed from a bearing part 19 and a ring-shaped periphery 21, and a bent projection 23 is formed consolidated with the inside of said periphery 21. This bent projection 23 protrudes toward the periphery while it is bent, and its continuing part with a scroll groove 3a in the housing body 5a constitutes a smooth curvature, and this bent projection 23 and the scroll groove 3a form a scroll chamber 3 of the compressor concerned C. Thus a housing 5 can be cast without use of any core, which provides manufacture of ones easy to cast and with no risk of failure. Further, air feed can be made smoothly from diffuser 14 to the scroll chamber 3 to ensure easy supercharging with good filling efficiency at a high air content.

Description

DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention) (Industrial Application Field) This invention relates to a compressor for a supercharger with an improved housing.

[Prior art]

Supercharger (generally mechanically driven for 1 hour)
A compressor used in a turbocharger or the like supercharges air and supplies the conventional 9 or more air to the engine. Among compressors for automobiles, turbochargers are the mainstream.

As shown in FIG. 4, this compressor C includes a housing 5 having an inlet 1 and a scroll chamber 3;
It is composed of a rotary impeller 7 that rotates inside. Here, the scroll chamber 3 is for supercharging the air compressed by the rotary impeller 7 and converting the air into efficient pressure in a part of the diffuser without loss, and the cross-sectional shape needs to be rounded. It is formed in a substantially circular shape.

Therefore, when casting the housing 5, a core must be used to form the souffle call chamber 3. However, when a core is used to form the scroll chamber 3, internal defects such as blowholes are likely to occur in a portion of the housing 5. In addition, gas defects occur on the inner wall surface of the scroll chamber 3, reducing the quality of the housing 5.Furthermore, the opening to the outside is small and the core has a large volume, so it has poor burning resistance. There was an inconvenience that it took time to remove the core sand after casting.

Therefore, in order to form the housing 5 without using a core, the scroll chamber 3 is divided into a scroll groove 38 having a U-shaped cross section and a protruding diffuser wall member 3b, as shown in FIG. 1: A groove 3a is formed in the housing 5, and the diffuser wall member 3b is
A method has been devised in which the diffuser wall member 3h is processed and formed as a separate body (casting, cutting out the nails 9j) and fixed to the housing 5.

[Problems with conventional technology]

However, since the product manufactured by this method does not use a core, the inconvenience caused by the use of a core is eliminated, but since the lower part 9 of the scroll chamber 3 is a right angle, the rotor wheel 7 When the air flowing along the diffuser wall member 31) flows into the scroll chamber 3, it collides with the right-angled corner lower part 9, causing backflow and turbulence, which changes into heat and increases the air density. becomes smaller and the filling efficiency decreases. For this reason, there was a drawback that efficient supercharging was difficult to be performed in the scroll chamber 3.

(Structure of the Invention) [Means for Achieving the Aforesaid Object] This invention has been made to solve the above-mentioned problems, and the gist thereof is to have an inlet approximately in the center, and to have a wall 1 of the inlet. It is equipped with a λ housing having a scroll chamber formed in its periphery, and a rotary wheel rotatably installed within the housing, and when the rotary wheel is rotated by an appropriate means, outside air is drawn from the intake port. In the supercharger compressor that sucks air into the housing and sends air to the scroll chamber, the housing includes a housing body having an opening and a lid body covering the opening of the housing body, The suction port is formed approximately in the center of the hacking body, and a scroll groove having an IJ-shaped cross section is formed on the outer periphery of the suction port. A curved protrusion protruding in a curved shape is formed, and when the lid covers the opening of the housing body, the scroll groove of the housing body and the curved protrusion of the lid form the scroll chamber. The compressor for a supercharger is characterized in that a continuous portion between the curved protrusion and the scroll groove has a smooth curved surface.

[Action of the invention]

The compressor for a supercharger according to the present invention is configured as described in (h), that is, the housing includes a housing body having an opening and a lid body that covers the opening of the housing body. The housing body has a suction port formed approximately in the center thereof, and a scroll recess with a U6-shaped cross section is formed on the outer periphery of the suction port, and eleven scroll recesses are formed on the peripheral edge of the lid body. is formed with a curved protrusion that protrudes in a curved manner toward the periphery, and when the lid covers the opening of the housing body, the scroll groove of the housing body and the curved protrusion of the 77 bodies Since the continuous portion between the curved protrusion and the scroll groove has a smooth curved shape, the housing can be cast without using a core, and
Air compressed by the rotating W wheel can be smoothly supplied from the diffuser part where it is converted into an efficient pressure to the SFU 1 call chamber, making it easy to supercharge with high air density and high filling efficiency.

Part-1, in the compressor for a supercharger according to this invention,
Since no core is used in casting the housing, die casting is also possible, and as a result, a housing that is easy to cast and free from casting defects can be obtained.

DESCRIPTION OF EMBODIMENTS Hereinafter, the present invention used in a turbocharger will be described in detail based on FIGS. 1 and 2.

In describing the embodiment, the same reference numerals are used for parts common to the conventional example.

In the figure, 54 is a housing of a compressor C, and 5a is a main body of the housing 5.

The housing body 5a has an opening 11 at the bottom and an air intake port 1 approximately at the center of the housing body 5a.

The scroll groove has an IJ-shaped cross section and is formed around the air intake hole 11 in the housing body 5a.The scroll groove 38 and the air intake port 1 communicate with each other via the diffuser wall 13. .

The housing main body 5a configured in this way has a scroll>+? j Since it does not have a convex curved part inward of 3a,
As shown in FIG. 2, it can be cast using an upper mold 15 and a double mold 17 without using a core.

Next, in FIG. 1, 5h is a lid of the housing, which covers the opening 11 of the housing body 5a.

The lid body 5h is composed of a bearing portion 19 that supports a rotary impeller 7 (which is rotated by driving a turbine wheel (not shown) by engine exhaust gas) and an annular peripheral portion 21. Reference numeral 23 denotes a curved protrusion, which is integrally formed inside the peripheral portion 21 . This curved protrusion 2]J protrudes in a curved manner toward the circumferential edge, and the portion connected to the scroll groove 3a of the housing body 5a forms a smooth curved surface. The scroll groove 38 of the housing body 5a forms the scroll chamber 3 of this compressor C. Incidentally, as shown in FIG. 3, a bulge may be provided on the other end side of the curved protrusion 23 in the peripheral portion 21, and the diffuser lower wall 13a may be integrally formed.

In this compressor C, air compressed by the rotary impeller 7 is smoothly sent from the diffuser part 14 to the scroll chamber 3 along the curved protrusion 23 of the lid 5b. Therefore, the compressed air does not collide with the scroll groove 38, and is less likely to cause turbulence such as backflow.

(Effects of the Invention) In the compressor for a supercharger according to the present invention, the housing includes a housing body having an opening, and a lid body that covers the opening of the housing body, and the housing body has a substantially center portion. A suction port is formed, and a scroll groove having an IJ-shaped cross section is formed on the outer periphery of the suction port, and a curved protrusion that protrudes in a curved manner toward the periphery is formed on the periphery of the lid. and when the lid covers the opening of the housing body, the scroll groove of the housing body and the curved protrusion of the lid form the scroll chamber, and the eye, the curved protrusion, and the Since the part connected to the scroll groove has a smooth curved shape, the housing can be cast without using a core, and the scroll is connected to the scroll from a part of the diffuser where the air compressed by the rotor is converted into efficient pressure. Since air can be supplied to the chamber evenly, supercharging with good filling efficiency is easily achieved.

Furthermore, in the turbocharger compressor according to the present invention, since no core is used when casting the housing,
Guicast casting is also possible, and as a result, it becomes easier to cast and it is possible to produce a housing without casting defects.

Furthermore, if the peripheral portion and the bearing portion are formed separately, it becomes easier to manufacture the lid. Further, if the peripheral portion and the bearing portion are integrally formed, there will be no connecting portion and the number of seal portions will be reduced, resulting in a reduction in the number of parts.

[Brief explanation of drawings]

Fig. 1 and Fig. 2 show an embodiment of a compressor for a supercharger according to the present invention, Fig. 1 is a sectional view, and Fig. 2 is a casting state diagram of the housing used in Fig. 1. , FIG. 3 is a sectional view of another embodiment of this compressed air, and FIGS. 4 and 5 are sectional views of a conventional example. 1... Suction port 3... Scroll chamber 3a... Scroll groove 5... Housing 5a... Housing body 5b... Lid body 7... Rotary impeller II... Opening part (housing Body) 19 ・
... Bearing part (lid) 21 ... Peripheral part (lid) 23 ... Curved protrusion C... Compressor patent applicant: Asahi Malleable Iron Co., Ltd. agent, patent attorney Yuji Nosue. 111' Layer 1, □ Figure 1 2nd work 5a I/ Figure 3'C 4z

Claims (3)

[Claims] (1) A housing having a suction port approximately in the center and having a scroll chamber formed around the outer periphery of the suction port, and a rotary impeller rotatably installed in the housing, A compressor for a supercharger that sucks outside air into the housing from the suction port and sends the air to the scroll chamber when the vehicle rotates by an appropriate means, wherein the housing includes a housing body having an opening, and the housing body. a lid body covering an opening of the housing body, the suction port is formed approximately at the center of the housing body, and a scroll groove having a U-shaped cross section is formed on the outer periphery of the suction port; A curved protrusion protruding in a curved manner toward the periphery is formed on the periphery of the lid, and when the lid covers the opening of the housing body,
The scroll groove of the housing body and the curved protrusion of the lid body form the scroll chamber, and the continuous portion of the curved protrusion and the scroll groove has a smooth curved surface shape. Compressor for supercharger. (2) A patent claim characterized in that the lid body includes a peripheral edge portion having a curved protrusion and a bearing portion for pivotally supporting the rotary impeller, and the peripheral edge portion and the bearing portion are formed separately. A compressor for a supercharger according to item 1. (3) A patent claim characterized in that the lid body includes a peripheral edge portion having a curved protrusion and a bearing portion for pivotally supporting the rotary impeller, and the peripheral edge portion and the bearing portion are integrally formed. A compressor for a supercharger according to item 1.