JPH0524360B2 - - Google Patents

Description

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

[Prior art]

Compressors used in superchargers (generally referring to mechanically driven types), turbochargers, etc. supercharge air to supply more air than conventional ones to the engine. Among compressors for automobiles, turbochargers are the mainstream.

As shown in FIG. 4, the compressor C is comprised of a housing 5 having an inlet 1 and a scroll chamber 3, and a rotary impeller 7 rotating within the housing 5. Here, the scroll chamber 3 is for supercharging the air compressed by the rotary impeller 7 and converted into efficient pressure in the differential user section without loss, and has a rounded cross-sectional shape. It is necessary and is formed in a substantially circular shape.

Therefore, when casting the housing 5, a core must be used to form the scroll 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 may occur on the inner wall surface of the scroll chamber 3, degrading the quality of the housing 5.Furthermore, the opening to the outside is small and the core has a large volume, resulting in poor burning resistance, and after casting. There was an inconvenience that it took time to remove the core sand.

Therefore, in order to form the housing 5 without using a core, the scroll chamber 3 is divided into a scroll groove 3a having a U-shaped cross section and a protruding differential user wall member 3b, as shown in FIG. Then, the scroll groove 3a is formed in the housing 5, and the differential user wall member 3b is processed and formed as a separate body (casting, cutting by forging), and the differential user wall member 3b is fixed to the housing 5. was devised.

[Problems with conventional technology]

However, since the product manufactured by this method does not use a core, the disadvantages due to the use of a core are eliminated, but since the lower part 9 of the scroll chamber 3 is rectangular,
When the air compressed by the rotary impeller 7 and flowing along the differential user wall member 3b flows into the scroll chamber 3, it collides with this right-angled corner lower part 9, causing backflow and turbulence. The air changes into heat and the air density decreases, reducing the filling effect. 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] The present invention has been made to solve the above-mentioned problems, and the gist thereof is to have a suction port approximately in the center and to have an outer periphery of the suction port. The housing includes a housing in which a scroll chamber is formed in the housing, and a rotary impeller rotatably installed in the housing, and when the rotary impeller rotates by an appropriate means, outside air is drawn from the inlet into the inlet. In a supercharger compressor that draws air into a housing and sends air to the scroll chamber, 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 includes: The suction port is formed approximately at the center, and a scroll having a U-shaped cross section is formed on the outer periphery of the suction port, and a curvature protruding toward the periphery is formed on the periphery of the lid. A protrusion 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, and the curved protrusion The compressor for a supercharger is characterized in that a continuous portion between the scroll groove and the scroll groove has a smooth curved surface shape.

[Action of the invention]

Since the turbocharger compressor according to the present invention is configured as described above, 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 the following features: An inlet is formed approximately in the center of the inlet, and a cross section U is formed on the outer periphery of this inlet.
a letter-shaped scroll groove is formed, and a curved protrusion that protrudes in a curved manner toward the periphery is formed on the peripheral edge of the lid, and when the lid covers the opening of the housing main 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 curve, so that the housing In addition to being able to cast without using a core, the air compressed by the rotary impeller is converted into efficient pressure, and the air can be smoothly delivered from the differential user section to the scroll chamber, resulting in high air density and good filling efficiency. Easily overcharged.

Furthermore, since the compressor for a supercharger according to the present invention does not use a core when casting the housing, die casting is also possible.
As a result, a housing that is easy to cast and free from casting defects can be obtained.

[Explanation of Examples]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention used in a turbocharger will be described below with reference to FIGS. 1 and 2.

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

In the figure, 5 is the housing of compressor C, 5a
is a housing body which is the main part of this housing 5. The housing main body 5a has an opening 11 downward.
It also has an air intake port 1 approximately in the center of the upper part. Further, 3a is a scroll groove having a U-shaped cross section, and is connected to the air intake port 1 in the housing body 5a.
is formed around. This scroll groove 3a
and the air intake port 1 are in communication via the differential user wall 13. Since the housing main body 5a configured in this way does not have a convex curved portion inward of the scroll groove 3a, it can be formed by the upper mold 15 and the lower mold 17 without using a core, as shown in FIG. It is something that can be cast.

Next, in FIG. 1, 5b is a lid of the housing, which covers the opening 11 of the housing body 5a. The lid body 5b is composed of a bearing portion 19 that pivotally supports a rotary impeller 7 (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 23 protrudes in a curved manner toward the circumferential direction, and the continuous portion of the housing body 5a with the scroll groove 3a forms a smooth curved surface, and the curved protrusion 23 and the housing The scroll groove 3a of the main body 5a forms the scroll chamber 3 of this compressor C. As shown in FIG. 3, a bulge may be provided on the other end side of the curved protrusion 23 in the peripheral edge 21, and the differential user lower wall 13a may be integrally formed.

In this compressor C, air compressed by the rotary impeller 7 is smoothly sent from the differential user section 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 3a, and is less likely to cause backflow or turbulence.

(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 cross section U is formed on the outer periphery of the suction port.
a letter-shaped scroll groove is formed, and a curved protrusion that protrudes in a curved manner toward the periphery is formed on the peripheral edge of the lid, and when the lid covers the opening of the housing main body, The scroll groove of the housing main 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 shape. In addition to being able to cast without using a core, the air compressed by the rotary impeller is converted to efficient pressure and can be smoothly delivered to the scroll chamber from the differential user section, allowing for highly efficient supercharging. easy to be

Furthermore, since the compressor for a supercharger according to the present invention does not use a core when casting the housing, die casting is also possible.
As a result, it is possible to obtain a housing that is easy to cast and free from 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]

1 and 2 show an embodiment of a compressor for a supercharger according to the present invention, and FIG. 1 is a sectional view;
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 compressor, and FIGS. 4 and 5 are sectional views of a conventional example. DESCRIPTION OF SYMBOLS 1... Suction port, 3... Scroll chamber, 3a... Scroll groove, 5... Housing, 5a... Housing body, 5b... Lid body, 7... Rotary impeller, 11... Opening part (housing body), 19... Bearing part (lid body), 21
... Peripheral portion (lid), 23... Curved protrusion, C... Compressor.

Claims (1)

[Scope of Claims] 1. A housing having a suction port approximately at the center and a scroll chamber formed on the outer periphery of the suction port, and a rotary impeller rotatably installed within the housing, In the compressor for a supercharger, the rotary impeller rotates by an appropriate means to suck outside air into the housing from the suction port and supply the air to the scroll chamber, wherein the housing has an opening. It consists of a main body and a lid covering an opening of the housing main body, and the housing main body has the suction port formed approximately in the center thereof, and a scroll groove having a U-shaped cross section is formed on the outer periphery of the suction port. and a curved protrusion protruding in a curved manner toward the periphery is formed on the peripheral edge of the lid body, and when the lid body covers the opening of the housing body, the lid body is formed with a scroll groove of the housing body. A compressor for a supercharger, wherein the curved protrusion of the lid body forms the scroll chamber, and a continuous portion between the curved protrusion and the scroll groove has a smooth curved surface. 2. The lid body includes a peripheral edge portion having a curved protrusion and a bearing portion for pivotally supporting a rotary impeller, and the peripheral edge portion and the bearing portion are formed separately. The compressor for a supercharger according to item 1. 3. Claim 3, characterized in that the lid body includes a peripheral edge portion having a curved protrusion and a bearing portion for pivotally supporting a rotary impeller, and the peripheral edge portion and the bearing portion are integrally formed. The compressor for a supercharger according to item 1.