JP3227552B2 - Blower safety cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety cover of a blower used when a blower fan such as an outdoor unit of an air conditioner must be surrounded for security.

[0002]

2. Description of the Related Art A safety cover of a conventional blower will be described below.

[0003] As shown in FIG. 3, the air conditioner outdoor unit has an air impeller comprising an impeller 3 and a motor 4 directly connected to the impeller 3 in a space surrounded by a heat exchanger 1 and an outer plate 2. An orifice 5 is provided around the impeller 3. An outlet 6 is provided in a portion of the exterior plate 2 facing the downstream side of the impeller 3, and a grill 7 is provided outside the outlet 6 as a safety cover. The motor 4 is fixed to the outer panel 2 by a motor support 8, and external air is supplied to the motor 4.
By the rotation of the impeller 3 driven by the above, it is sucked from the heat exchanger 1 side, and is blown out from the grill 7 to the outside through the outlet 6.

As shown in FIG. 4, a grill 7 has a plurality of horizontal bars 9 made of thermoplastic synthetic resin having an elliptical or wing-shaped cross-sectional shape having a maximum thickness portion within a moldable range. Is vertically arranged on the vertical holding bar 10 to form a lattice shape, and is disposed at an attachment angle corresponding to the main flow direction of the air blown from the impeller 3 with respect to the vertical holding bar 10 to reduce ventilation resistance. Had to be configured.

[0005]

However, in the above-mentioned conventional structure, not only the interference sound generated by the collision of the airflow blown out from the impeller 3 with the horizontal bar 9 but also the elliptical cross section when flowing out. There is a problem in that the peeling occurring in the middle of the step interferes with the adjacent horizontal bars 9 to increase the peeling noise and the noise level is high.

The present invention solves the above-mentioned conventional problems, and suppresses the ventilation resistance of the airflow blown out from the impeller,
An object of the present invention is to provide a safety cover of a blower in which an interference sound and a peeling sound are reduced to reduce a noise level.

[0007]

In order to achieve this object, a safety cover of a blower of the present invention has an impeller of an air blower having an elliptical cross section in an axial direction or an airfoil, and the mounting angle is individually set. A plurality of horizontal bars adapted to the main flow direction of air radially blown out from the impeller are formed in a lattice shape in which the long axis is vertically fixed to a plurality of vertical holding bars holding the horizontal bars,
The central part swells forward in the axial direction of the impeller as a whole.
A radial grill is provided at the outlet of the blowing means.

[0008]

In this configuration, the air flow blown out from the impeller is reduced when passing through the horizontal bar, and the separation is suppressed by the rectifying effect.

[0009]

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

In one embodiment of the present invention, the same components as those of the above-described conventional example are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIGS. 1 and 2, this embodiment is different from the above-mentioned conventional configuration in that the grill 7 is replaced by a grill 11. That is, the grill 11 individually adjusts the mounting angle of the plurality of horizontal bars 12 having an elliptical cross-sectional shape.
To the main flow direction of the air radially blown out from, the long axis of which is fixed vertically to the vertical holding bar 13 to form a grid,
In addition, the central portion has a radial configuration in which the central portion swells toward the front with respect to the axial direction of the impeller 3 as a whole.

The pitch between the horizontal bars 12 is set to a dimension that does not allow fingertips to enter the entire surface, and is a dimension that ensures safety against rotation of the impeller 3.

According to the above configuration, the mounting angle of each horizontal bar 12 is determined in accordance with the angle of the flow of air blown out from the impeller 3, so that the blowing resistance is reduced, and the interaction of each horizontal bar 12 The flow of air is contracted, and the effect of suppressing separation is produced.

Further, since the center portion of the grill 11 is radially expanded and the center portion is separated from the main body, the flow of air blown out from the impeller 3 and the interference sound of the grill 11 can be reduced, and the air conditioner of the air conditioner can be reduced. Noise can be reduced for the entire outdoor unit.

In the present embodiment, the cross section of the horizontal bar 12 is elliptical, but it goes without saying that the cross section may be a streamline such as an airfoil having a low resistance to air flow. In addition, the vertical holding bar having an elliptical cross section is also effective in reducing noise.

[0016]

As is apparent from the above description, according to the present invention, the impeller of the blowing means has an elliptical or airfoil cross-sectional shape, and the mounting angle is individually blown radially from the impeller. A plurality of horizontal crosspieces that match the main flow direction of air,
A grille whose major axis is fixed vertically to a plurality of vertical holding bars that hold the horizontal bars, and a radial grill whose central portion swells forward in the axial direction of the impeller as a whole With the configuration provided in the mouth, it is possible to realize an excellent safety cover of a blower in which the ventilation resistance of the airflow blown from the impeller is suppressed, the interference sound and the separation sound are reduced, and the noise level is reduced.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of an essential part of a grill of a safety cover of a blower according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of an outdoor unit of the air conditioner to which the safety cover of the blower is attached.

FIG. 3 is a schematic sectional view of an outdoor unit of an air conditioner to which a safety cover of a conventional blower is attached.

FIG. 4 is an enlarged sectional view of an essential part of a grill of a safety cover of the blower.

[Explanation of symbols]

 3 impeller 4 motor 6 outlet 11 grill 12 horizontal beam 13 vertical beam

Continuation of the front page (56) References JP-A-5-71766 (JP, A) JP-A-4-169724 (JP, A) JP-A-6-173898 (JP, A) Jpn. , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 5/00 F04D 29/00 F04D 29/66

Claims (1)

(57) [Claims] 1. A blower configured to blow air to the outside from an outlet by rotation of an impeller driven by a motor, wherein the impeller has an elliptical or airfoil cross-sectional shape in an axial direction. A plurality of horizontal rails whose angles are individually adjusted to the main flow direction of air radially blown from the impeller are vertically fixed to a plurality of vertical holding rails in which the long axes of the horizontal rails hold the horizontal rails. A safety cover for an air blower, wherein a grille having a lattice shape and having a radial shape whose front part is swelled toward the front with respect to the axial direction of the impeller as a whole is provided at the outlet.