JPS644294Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of the bracket structure of a motor for an axial flow fan.

FIG. 1 shows the external structure of a conventional motor for an axial fan. Reference numeral 1 denotes a frame of the motor, to which a stator core is attached. Reference numeral 2 denotes a bracket which supports the rotor of the motor with a bearing and is connected to the frame 1, and its outer shape when viewed from the axial direction is polygonal so that it can be mounted at any angle. 3
transmits the torque generated by the motor through the rotating shaft. Reference numeral 4 denotes a mounting leg (stay) for mounting this motor on the other side (the wind body of an axial blower), which is usually formed by sheet metal press into the shape shown in the figure and is mounted to the bracket 2 by screwing it. Mounting foot 4
The bend as shown in the figure is made of thin steel plate, so it protrudes from the bottom when the screw is tightened, so it is necessary to allow it to escape.

In the conventional structure, the bracket 2 itself is dedicated (polygonal) for use with an axial flow fan, and the mounting plate 4 is pressed, bent, and attached to the bracket, so the cost of the mounting plate is high. ○Because it is bent and attached to the bracket, it may be difficult to align the holes depending on the bending accuracy. ○Depending on the length of the frame, there were drawbacks such as the need to prepare several types of press-bent mounting plates as well as the extension of the frame width.

This idea is an improvement to eliminate the above-mentioned drawbacks, and as shown in Figure 2, the outside diameter of the bracket is made larger than the outside diameter of the frame to the position of the mounting surface of the mounting foot. An object of the present invention is to provide a motor for an axial flow fan that solves the above-mentioned drawbacks by providing a window between the diameters and allowing air to pass through the window.

FIG. 2 shows the external structure of a motor for an axial fan according to this invention. As in the conventional motor, 1 is a motor frame to which a stator core is attached.
2 is a bracket that supports the rotor and bearing of the motor with a bearing and is connected to the frame 1; 3 is a rotating shaft that transmits the torque generated by the motor; 6 is a mounting foot with a screw hole 6 for attaching it to the mounting foot 4. It is designed so that it can be attached and fixed to the other side. This bracket 2 has an outer diameter larger than the frame outer diameter up to the position of the mounting foot mounting surface, and its outer shape when viewed from the axial direction is polygonal so that the mounting foot can be attached at any angle. A plurality of windows 5 for passage holes for cooling air are provided in the difference between the two and the cooling air is molded as a single structure so as not to impede cooling.

Furthermore, a bracket seat 8 is provided on the side surface of the bracket to serve as a stopper when a mounting foot is attached to the end surface.

In this way, there is an advantage that the cooling effect of the motor is not hindered, the mounting foot can be made from a single plate, there is no bending work, the hole position can be made with high precision, and assembly is easy.

Conventionally, the mounting legs 4 are bent, but according to this structure, the mounting legs 4 are made of a single plate, so the length of the mounting legs 4 can be made longer than the frame, so multiple screws can be inserted in advance. The advantage is that holes can be provided and the same mounting foot 4 can be used even if the frame length changes.

In the above embodiment, the mounting leg (stay) 4 is fixed to the bracket 2, but the mounting bracket 7 can also be mounted perpendicular to the axial direction of the motor without using the mounting leg (stay) 4.

A plurality of screw holes (not shown) are provided in the axial direction near the bracket seat 8, and the mounting bracket 7 is tightened and fixed thereto. In addition, in order to improve the workability when installing the mounting fitting 7, the bracket seat 8 is formed into a convex shape so that it can be easily positioned as a stopper.

Although four mounting legs (stays) 4 are used in this embodiment, it is also possible to use a different number of mounting legs (stays) 4 by utilizing the polygonal flat portions.

As described above, according to the present invention, the cooling air passage hole is provided at the difference between the outer diameter of the frame and the outer diameter of the bracket, and the bracket is formed as a single piece, thereby producing the following effects.

1. It is inexpensive because the mounting plate is a single plate and simple.

2. The length of the mounting plate is longer than the frame, and multiple screw holes can be pre-prepared, so the number of parts can be reduced.

3. The same bracket can be used when mounting the motor in the axial direction without using the mounting feet.

The same bracket can be used for mounting in the Γ axis direction.

4. By making the mounting seat of the bracket larger than the outer diameter of the frame, it can be directly screwed to the mating machine (the wind body of an axial blower) without the need for mounting feet.

[Brief explanation of drawings]

FIGS. 1a and 1b are a front view and a side view of a motor showing a conventional example. Figures 2a and 2b show an embodiment of this invention, showing a front view and a side view of the motor. 1... Frame, 2... Bracket, 3... Rotating shaft, 4... Mounting foot (stay), 5... Window, 6...
. . . Screw hole, 7 . . . Mounting bracket, 8 .

Claims (1)

[Scope of utility model registration request] In a motor that drives an axial flow fan, the outer diameter of the bracket that supports the frame of the motor from both sides and supports the rotating shaft is larger than the outer diameter of the frame, and the outer diameter of the bracket is polygonal. What is claimed is: 1. A motor for an axial flow fan, comprising a bracket molded as a single piece with cooling passage holes provided in a portion that differs from the outer diameter of the bracket.