JPH04347398A - Inlet port of turboblower - Google Patents

Abstract

PURPOSE:To solve a problem on the occurrence of turbulent flow in and around an intake air conducting part as well as to promote the prevention of noise happening and improvement in air blowing efficiency by extruding the outer circumference of a cylindrical tip part forming an inlet port inward into a semicircular section, and forming the bell-mouthed intake conducting part in this tip part. CONSTITUTION:When a turning shaft is rotated, air drawn in from an inlet port 1 by action of an impeller 6 passes through a committing guide 10 installed in each inside of two covers 8, 9, and delivered out of a discharge port 7a of a casing 7 after being pressurized. In the above constitution, a bell-mouthed intake conducting part 3 is formed in a tip part of the inlet port 1 by means of extruding the outer circumference of the cylindrical tip part inward into a semicircular section. With this constitution, even in the case where the outside air is drawn in directly from the inlet port 1, a sudden whirl in the flowing direction of intake air in and around the intake conducting part 3 is solved, thus any turbulent flow is prevented from occurring. Therefore a noise is preventable from occurring and, what is more, air blowing efficiency is improvable in this way.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical suction port of a turbo blower which prevents turbulence from occurring at the tip and also allows an intake hose to be inserted and connected.

0002

2. Description of the Related Art Some turbo blowers have a cylindrical suction port protruding from the center of one end surface, and air is taken in either directly from the suction port or by connecting a hose to the suction port.

0003

[Problems to be Solved by the Invention] With the above structure, there is no problem when air is taken in by connecting a hose to the suction port, but when air is taken directly from the suction port, turbulence occurs at the tip of the suction port, causing noise. This has the drawback that it may occur and reduce the efficiency of air blowing.

[0004] In order to eliminate the above-mentioned drawbacks, the present invention
An object of the present invention is to provide a suction port for a turbo blower which prevents the occurrence of turbulent flow at the tip and also allows an intake hose to be inserted and connected.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention involves extruding the outer periphery of the tip of the cylinder 2 of the cylindrical suction port 1 inward to have a substantially semicircular cross section, so that the tip has a bell. A mouse-shaped intake air introduction section 3 is formed.

[0006]

[Function] The bellmouth-shaped intake air introducing portion 3 is provided to prevent the flow direction of intake air from turning suddenly, thereby preventing the occurrence of turbulent flow at the tip. Further, since the outer diameter of the intake air introducing portion 3 is the same as or smaller than that of the cylinder 2, the intake hose 4 can be easily inserted and connected to the intake port 1.

[0007]

[Embodiment] Fig. 1 shows an embodiment of the present invention, in which a plurality of stages of turbo-type impellers 6 fixed to one end of a rotating shaft 5 are connected to a casing 7 that supports the rotating shaft 5, and each stage is individually controlled. The first stage cover 8 has a cylindrical suction port 1 protruding from the center of the end face and is integrally formed (or attached separately). The air sucked from the suction port 1 by the action of the impeller 6 accompanying the rotation of the rotating shaft 5 is pressurized by the impeller 6 of the first stage, and then flows from the outer periphery to the outside of the cover 9 of the second stage as shown by the arrow. It passes between a plurality of rectifying guides 10 provided radially on the end face and is sent toward the center. This air is sucked through the center of the second-stage impeller 6 and further pressurized, and this pressurization is repeated and the high-pressure air is sent out from the discharge port 7a provided on the outer periphery of the casing 7. At the tip of the suction port 1, a bellmouth-shaped intake introduction part 3 is formed by extruding the outer periphery of the tip of a cylinder 2 inward to a substantially semicircular cross section. 2 or less.

According to the above-mentioned embodiment, even when the outside air is sucked directly from the suction port 1, the intake air introduction section 3 at the tip is curved into a bell mouth shape, so that there is no possibility of a sudden turn in the flow direction of the intake air near the intake introduction section 3. This prevents the generation of turbulent flow, thereby preventing the generation of noise and improving the air blowing efficiency. Further, even when connecting the suction hose 4 to the suction port 1 as shown in FIG. 2, since the outer diameter of the suction introduction part 3 is the same as or smaller than the cylinder 2, the connection can be easily inserted.

[0009] In the above embodiment, the case of a turbo blower was explained, but the present invention can be applied to any case where the suction port is cylindrical.

0010

According to the present invention, in the suction port of a turbo blower, the outer periphery of the tip of the cylinder of the cylindrical suction port is extruded inward to have a substantially semicircular cross section, so that the tip has the same outer diameter as the cylinder or By forming a bell-mouth-shaped intake inlet that is smaller than that, it is possible to prevent the occurrence of turbulence near the intake inlet and the accompanying noise, thereby improving air blowing efficiency. Even when connecting a hose, it is possible to easily insert and connect the hose.

[Brief explanation of the drawing]

[Fig. 1] Longitudinal cross-sectional view of an embodiment of this invention

[Figure 2] Longitudinal cross-sectional view of main parts with the intake hose connected to the intake port in Figure 1

[Explanation of symbols]

1 Suction port 2 Cylinder 3　　　　　Intake introduction section

Claims (1)

[Claims] Claim 1: In a cylindrical suction port protruding from the center of one end surface of a turbo blower, the outer periphery of the tip of the cylinder is extruded inward to have a substantially semicircular cross section, and the tip has a bellmouth-shaped intake introduction portion. A turbo blower suction port characterized by forming a.