JP2924378B2 - Flanged casing of blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower in which a flange is attached to the outer periphery of a discharge side end of a cylindrical casing, and air leakage from a gap between the casing and the flange can be prevented with a simple structure. About what you did.

[0002]

2. Description of the Related Art A conventional example of a flanged casing of a blower will be described with reference to FIG. This figure shows an axial blower, in which an annular flange 3 having a U-shaped cross section is attached to the outer periphery of the discharge side end of a cylindrical casing 2 surrounding an axial flow impeller 1. The flange 3 is bent using a thin iron plate to reduce the weight of the blower, and the U-shaped tip surface is aligned with the end surface of the casing 2 to rivet the joint with the casing 2 equally on the circumference. 4 or fixed integrally with the casing 2 by spot welding.
The impeller 1 is fixedly supported in a casing 2 (not shown).
The motor 5 is driven to rotate.

[0003]

In the above structure, when air is to be blown into a counterpart device in which a blower is mounted with the flange 3, not only does air leak from the gap between the joint between the casing 2 and the flange 3, but also this air leaks. In some cases, noise such as whistling noise may be generated, and in order to eliminate the clearance, a lot of trouble is required to close the joint with a sealing material or continuous welding. There was a drawback of lowering.

[0004] In order to eliminate the above-mentioned disadvantages, the present invention provides:
An object of the present invention is to provide a flanged casing of a blower, which can prevent air leakage from a gap between a cylindrical casing and a flange with a simple structure.

[0005]

In order to achieve the above-mentioned object, the present invention provides an annular flange 13 having a U-shaped cross section on the outer periphery of the discharge side end of the cylindrical casing 2 with its distal end face being the end face of the casing 2. The casing 2 and the flange 13 are fixed together, and the joint between the casing 2 and the flange 13 is wrapped by an annular member 14 made of an elastic material and having an inverted U-shaped cross section.

[0006]

The casing 2 and the flange 1 are formed by the annular member 14.
Since the joint of No. 3 is wrapped around, air leakage from the gap of the joint can be prevented with a simple structure.

[0007]

FIG. 1 shows an embodiment of the present invention.
Those indicated by the same reference numerals are the same parts. In this figure, an annular flange 13 having a U-shaped cross section is attached to the outer periphery of the discharge side end of a cylindrical casing 2 surrounding an axial flow impeller 1 (not shown). The flange 13 has one end face of the U-shape aligned with the end face of the casing 2 and is fixed to the casing 2 by rivets 4 at equal circumferential intervals, or is integrally fixed to the casing 2 by spot welding. The joint is wrapped around the entire circumference by an annular member 14 having an inverted U-shaped cross section made of an elastic material such as rubber. The other end face of the flange 13 is formed to extend from the one end face by the length of the annular member 14.

In the above embodiment, the case where the impeller 1 is of the axial flow type has been described. However, the present invention is not limited to this.

[0009]

According to the present invention, in a casing with a flange of a blower, an annular flange having a U-shaped cross section is integrally fixed to the outer periphery of the discharge side end of the cylindrical casing with its leading end face aligned with the end face of the casing. At the same time, the joint between the casing and the flange is wrapped by an annular member having an inverted U-shaped cross section made of an elastic material, so that air leakage from the clearance of the joint can be prevented with a simple structure. can get.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Impeller 2 Casing 13 Flange 14 Ring member

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04D 29/00-29/16 F04D 29/40-29/56 F24F 13/02 F24F 13/06 F24F 7/013 101

Claims (1)

(57) [Claims] An annular flange having a U-shaped cross section is integrally fixed to the outer periphery of a discharge side end of a cylindrical casing surrounding an impeller with its leading end face aligned with the end face of the casing and joined to the casing and flange. A flanged casing of a blower, wherein the casing is surrounded by an annular member having an inverted U-shaped cross section made of an elastic material.