JPH034800Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an air cooling motor/fan, which can be installed inside the case of equipment, for example, in order to forcefully cool the internal heat generated in office equipment or electronic equipment. In particular, the present invention relates to an air cooling motor/fan that can reduce noise at a frequency around 1 kilohertz, which is unpleasant to the ears during operation.

[Conventional technology]

The conventional structure of this type of air cooling motor/fan and its problems will be explained with reference to FIGS. 4 and 5. In addition, prior applications regarding the wind body case structure of this type of motor/fan include Utility Application No. 100480-1980 and Utility Application No. 100480.
There are issues such as No. 60-195113. The conventional structure of this type of motor fan includes a hollow cylindrical wind cylinder 1 and one end of the wind cylinder 1, as shown in FIG. a motor 3 supported by a plurality of support legs 2;
A plurality of blades 4 are arranged on the outer periphery of the wind cylinder and rotate integrally with the motor rotation part, and blades 4 are formed integrally with the wind cylinder at the air suction end and the discharge end of the wind cylinder 1, respectively, and are used for fastening when externally installed. It consists of a frame 6 having a through hole 5 for passing a screw therethrough.
As the blades 4 rotate, air sucked in from the suction side 11 is discharged from the discharge side 12 through the space between the inner peripheral surface of the wind cylinder 1 and the outer peripheral surface of the motor 3. To attach this motor fan to the side wall of an electronic device case, for example, the frame 6 on either the suction side or the discharge side is used and fastened to the side wall of the electronic device case with a fastening screw. Fifth
The figure is a sectional view of the case where the frame 6 on the discharge side is used, where 7 indicates the side wall of the electronic device case, and 8 indicates a fastening screw. In this case, the through hole 5 drilled in the frame 6 that is not used for installation.
remains open. Arrows 9 and 10 indicate wind flows, with 9 indicating a loaded state and 10 indicating an unloaded state.

However, such a conventional wind cylinder frame structure has a problem in that a large amount of noise is generated on the air suction side. The shape of the wind cylinder frame that has the most influence on the noise generated by the fan is the shape of the frame on the suction side. Not generating vortices in the air flow on the fan suction side leads to lower noise. On the other hand, in an unloaded state, the wind flow is as shown by arrow 10 in Fig. 5, and there is no effect of leaving the through hole 5 open; however, in a loaded state, the wind flow is as shown by arrow 9. As a result, a flow passing through the through hole 5 also occurs, which increases the vortex of the air flow and increases the noise.

[Problem that the invention attempts to solve]

As mentioned above, in conventional motor fans, frames for external mounting are formed on each of the suction and discharge sides of the wind barrel, and either frame is used to fasten screws to the side wall of the equipment case. However, there was a problem in that the through-holes for screws drilled in the unused frame were left open, which increased noise generation on the suction side.

The purpose of this invention is to solve the above-mentioned problems with the conventional structure, and to provide an air-cooled motor with a structure that eliminates the flow of air flowing in through the frame through holes during load conditions and reduces the noise generated.・The aim is to provide fans.

[Means for solving problems]

The above purpose is to use the through holes drilled in the frame.
Closed with a peelable thin film or removable filler piece, and when externally installed, only the thin film or filler piece of the through hole into which the fastening screw is inserted is peeled off or removed and the fastening screw is inserted there. This is achieved by creating a structure that allows

[Effect]

Since the thin film or filling piece remains in the through holes drilled in the frame that are not used for external installation, even if this frame side becomes the suction side, it will affect the generation of vortices in the air flow under load conditions. It is possible to reduce the noise.

〔Example〕

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

FIG. 1 shows a cross-sectional view (a cross-sectional view of the upper half taken along a plane passing through the axis) of one embodiment of the present invention. Wind fuselage 1
A thin film 7 is provided in all of the through holes 5 drilled in the frame of the frame, and the through holes 5 are closed by the thin film 7. When the motor fan is attached to the side wall of an equipment case, etc., a thin film 7 is provided. The thin film 7, which only has the through hole 5 into which the screw is inserted, is pushed through with the tip of a screwdriver, etc., to penetrate the through hole 5, and the fastening screw is inserted there to attach the motor to the side wall.
Attach the fan securely. The thin film 7 remains in the through hole 5 of the frame that is not used for external attachment. As a result, the through holes 5 do not affect the generation of vortices in the air flow during a loaded state.

Figure 2 is a sectional view showing another embodiment of the present invention (also a sectional view of the upper half taken along a plane passing through the axis)
In this case, instead of the thin film 11 shown in FIG. 1, a filling piece 12 is used to close all the through holes 5, and the filling piece 12 is used only for the through hole 5 into which the fastening screw is inserted when externally installed. is pushed out to open the through hole 5, and a fastening screw is inserted therein.

FIG. 3 is a noise comparison diagram between the conventional structure and the structure of this embodiment, where the horizontal axis shows frequency (Hz) and the vertical axis shows noise in decibels. In the conventional structure, the four through holes 5 drilled in the frame on the suction side remain open under load conditions. Example thin film 7
is provided to close the through hole. The fundamental frequency generated by the rotation of the blades of the motor fan used in the comparative experiment is approximately 250 Hz, and compared to the solid line a of the noise of the conventional structure, the broken line b of the structure of this example is particularly 250 Hz x 4. It was confirmed that the noise around 1kHz was significantly reduced.

[Effect of idea]

As explained above, according to the present invention, a removable thin film or a removable filling piece is provided in all of the through holes drilled in the frame of the wind cylinder to close the through holes, and the through holes are fastened when externally installed. It has a simple structure in which only the thin film or filling piece is inserted and the through hole is inserted into the through hole where the screw is inserted.
Noise generation under load can be reduced.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views of the embodiments of the present invention, Figure 3 is a noise comparison diagram showing the effects of the present invention, Figure 4 is a diagram of the conventional structure, a is a front view, and b is the X- FIG. 5 is a cross-sectional view illustrating problems with the conventional structure. Explanation of symbols, 1...Wind trunk, 2...Support legs, 3...
... Motor, 4 ... Vane, 5 ... Through hole, 6 ... Frame, 7 ... Side wall for mounting, 8 ... Screw for fastening, 9 ... Wind flow when loaded, 10 ... When no load Wind flow, 11... Peelable thin film, 12...
Removable filler piece.

Claims (1)

[Scope of utility model registration request] A motor is supported by a plurality of support legs at one end of a hollow cylindrical wind barrel, and a plurality of blades that are integral with the motor rotation part are arranged on the outer periphery of the motor. In an air cooling motor/fan, in which a frame is formed integrally with the wind barrel, each of which has a through hole drilled at the end and the discharge end thereof through which a fastening screw passes through when externally mounted, The through hole is closed with a peelable thin film or a removable filling piece, and only the thin film or filling piece of the through hole into which the fastening screw is inserted is peeled off or removed and the fastening screw is inserted. Air cooling motor/fan.