JP3730475B2 - Finger guard for blower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a finger guard for a blower.
[0002]
[Prior art]
Some blowers having an impeller that rotates using a motor as a drive source include a finger guard at the inlet of the blower in order to prevent injury caused by a finger touching a blade provided on the impeller. Generally, the finger guard is formed of a steel wire plate or a synthetic resin, and is directly attached to the blower so as to cover the suction port of the blower, or against a wall portion of a housing such as an electronic device in which the blower is arranged. It is attached so as to cover the inlet of the blower. Such a finger guard has a frame body and a guard part arranged inside the frame body. The guard portion prevents human fingers from entering and has air permeability.
[0003]
[Problems to be solved by the invention]
When the impeller of the blower rotates and air is sucked through the ventilation passage of the guard portion of the finger guard, the air passes between the plurality of blades, and noise is generated. However, in the blower provided with the conventional finger guard, there is a problem that air passing through the finger guard causes turbulent flow and increases noise between the blades.
[0004]
The objective of this invention is providing the finger guard for air blowers which can suppress that a noise becomes large.
[0005]
[Means for Solving the Problems]
The blower finger guard to be improved by the present invention has a frame body made of synthetic resin and a guard portion that is disposed inside the frame body and has air permeability to prevent human fingers from entering. It is arranged on the suction port side of the blower and used to cover the suction port. In the present invention, a plurality of communication holes for sucking air from the outside of the frame body are formed in the frame body so as to surround the inner space. When a plurality of communication holes are formed in the frame body as in the present invention, air is sucked from the plurality of communication holes provided in the frame body toward the blower side when the impeller of the blower rotates. In the conventional finger guard, the inventor has found that the air passing through the guard portion causes turbulent flow in the space surrounded by the frame, which increases the noise between the blades. Therefore, in the present invention, a plurality of communication holes are formed in the frame body, and air is also sucked from these communication holes, thereby suppressing turbulent flow. Therefore, according to the present invention, noise can be reduced as compared with the conventional art.
[0006]
The plurality of communication holes formed in the frame body may be any structure as long as the air generated in the vicinity of the frame body can be prevented from becoming a turbulent flow, and can be formed in various shapes. For example, if each communication hole is formed by an elongated hole that opens in both the direction toward the inner space inside the frame and the direction away from the inner space and the direction toward the suction port of the blower, the communication with a large area of the opening Holes can be easily formed.
[0007]
In the finger guard for an air blower according to the present invention, when a rectangular frame is used, the four frame bones constituting the four sides of the rectangular frame are formed in the inner space surrounded by the frame. One or more communication holes for sucking air from the outside are formed respectively. In this case, one communication hole is formed in each of the four frame bones, and the communication hole is formed as an elongated hole that opens in both the direction toward the inner space and the direction away from the inner space and the direction toward the suction port. Is preferred.
[0008]
The guard portion includes a maximum annular inner bone portion connected to each of the four frame bone portions, a plurality of annular inner bone portions disposed concentrically inside the maximum annular inner bone portion, and a plurality of annular inner bones. A plurality of linear inner bone portions that extend radially outward from a central portion located at the center of the portion and connect the frame body, the largest annular inner bone portion, and the plurality of annular inner bone portions. In this case, the connecting portion between the largest annular inner bone portion and the frame bone portion is positioned at the center portion in the longitudinal direction of the frame bone portion, and the elongated hole forming the communication hole has a symmetrical shape with the connecting portion as the center. It is preferable to form it. By configuring the guard part in this way, it is possible to obtain a high air permeability that is not partially biased while maintaining the mechanical strength of the guard part.
[0009]
In addition, through holes for attachment for attaching a finger guard to a casing of a blower or an electronic device can be formed at four corners of the rectangular frame. In this case, the communication hole formed in the frame is preferably formed in a size that does not reduce the mechanical strength of the portion where the through hole is formed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially cutaway sectional view showing a mode in which the finger guard according to the embodiment of the present invention is attached to a blower, and FIG. 2 is a sectional view taken along the line II-II in FIG. As shown in both figures, a finger guard 5 is attached to the axial blower 1 via a wall portion of a housing 3 of an electronic device. The blower 1 has a structure in which an impeller 9 is disposed in a case body 7. The impeller 9 has a structure in which a plurality of blades 13 are attached to the outside of the cup member 11, and a motor is disposed inside the cup member 11. The blower 1 of this example rotates the impeller 9 by driving a motor in the cup member 11 to create an air flow from the right side to the left side as viewed in the drawing, and send cooling air into the electronic device. The case body 7 has a square outline shape, and has a suction port 7a and a discharge port 7b at both opening ends. As shown in FIG. 2, the blower 1 is arranged such that the suction port 7 a faces and communicates with the opening 3 a formed in the housing 3.
[0011]
The finger guard 5 is integrally formed of a synthetic resin. As shown in FIGS. 3 to 5, the frame 15 and the web-shaped guard 17 disposed on one opening side inside the frame 15. And have. 3 to 5 are a plan view, a side view, and a back view of the finger guard 5. The frame 15 has a rectangular shape with a substantially square outline, and has four frame bone portions 19... Constituting four sides. Each of the four frame bone portions 19 is formed in a plate shape, and at the center in the longitudinal direction of the four frame bone portions 19..., The inner space 21 surrounded by the frame body 15 shown in FIG. Are formed with communication holes 23 for inhaling air. These communication holes 23 are formed in both the direction toward the inner space 21 and the direction away from the inner space 21, and the other opening side of the frame body 15 where the guard portion 17 is not formed (on the suction port 7a of the blower 1). It is formed by a long and narrow hole that opens in the direction toward the head. Further, through holes 15a for attachment for inserting screws 25 are formed at four corners of the frame body 15, respectively. Each communication hole 23 is formed in a size that does not reduce the mechanical strength of the portion where the through hole 15a is formed (in this example, a size having a length dimension that is approximately ½ the length of the frame bone portion 19). ing. As shown in FIG. 2, the finger guard 5 is arranged so that the opening of the frame 15 in which the guard 17 is not formed faces the opening 3 a of the housing 3 and communicates therewith. As described above, since the suction port 7a of the blower 1 faces the opening 3a of the housing 3, the finger guard 5 is disposed so as to cover the suction port 7a. In this state, the finger guard 5 is aligned with the through-hole 15a and the through-hole 15a, and the housing 3 by four screws 25 passing through the through-hole formed in the housing 3 and the blower 1. It is attached to the blower 1 through the wall part.
[0012]
The guard portion 17 is formed integrally with the frame body 15 and has a structure having air permeability that prevents human fingers from entering. Specifically, the guard portion 17 includes a maximum annular inner bone portion 17a connected to each of the four frame bone portions 19 and three annular inner bones disposed concentrically inside the maximum annular inner bone portion 17a. .., A disc portion 17c located at the center of the plurality of annular inner bone portions 17b, and radially extending from the disc portion 17c to the frame 15 and the maximum annular inner bone portion 17a and the plurality of annular inner portions. It is comprised from the eight linear internal bone parts 17d which connect the bone parts 17b .... The largest annular inner bone portion 17 a is formed so that the connecting portion with the frame bone portion 19 is located at the center in the longitudinal direction of the frame bone portion 19. As a result, the communication hole 23 has a symmetrical shape with the connecting portion as the center.
[0013]
As shown in FIG. 2, when the finger guard 5 of this example is used, air is sucked from the four communication holes 23 formed in the frame 15 toward the inner space 21 when the impeller 9 of the blower 1 rotates. (Arrow A). In the conventional finger guard, only air from the guard portion indicated by the arrow B enters the inner space 21 and causes turbulence in the inner space 21. On the other hand, if the finger guard 5 of this example is used, it can suppress that a turbulent flow arises when air enters also from several communicating hole 23 .... Therefore, noise generated between the blades 13 can be reduced.
[0014]
【The invention's effect】
According to the present invention, since air is sucked also from the communication hole formed in the frame, it is possible to suppress the occurrence of turbulent flow in the air and to reduce noise.
[Brief description of the drawings]
FIG. 1 is a partially broken cross-sectional view showing a mode in which a finger guard according to an embodiment of the present invention is attached to a blower.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a plan view of the finger guard according to the embodiment of the present invention.
FIG. 4 is a side view of the finger guard according to the embodiment of the present invention.
FIG. 5 is a rear view of the finger guard according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Blower 3 Case 5 Finger guard 7a Suction port 15 Frame 17 Guard part 17a Maximum annular inner bone part 17b Annular inner bone part 17d Straight inner bone part 19 Frame bone part 21 Inner space 23 Communication hole

Claims (3)

It has a rectangular frame body and a guard part that is molded integrally with the frame body and has air permeability to prevent human fingers from entering inside, and is disposed on the inlet side of the blower A finger guard for a blower made of synthetic resin covering the suction port,
One communication hole for sucking air from the outside of the frame body is formed in each of the four frame bone portions constituting the four sides of the rectangular frame body in the inner space surrounded by the frame body. and,
The blower finger guard according to claim 1, wherein the communication hole is an elongated hole that opens in both a direction toward the inner space and a direction away from the inner space and a direction toward the suction port side . The guard portion includes a maximum annular inner bone portion connected to each of the four frame bone portions, a plurality of annular inner bone portions disposed concentrically inside the maximum annular inner bone portion, and the plurality of annular shapes. A plurality of linear inner bone portions extending radially outward from a central portion located at the center of the inner bone portion and connecting the frame, the largest annular inner bone portion, and the plurality of annular inner bone portions. ,
The connecting portion between the largest annular inner bone portion and the frame bone portion is located at the center in the longitudinal direction of the frame bone portion,
The blower finger guard according to claim 2, wherein the elongated hole has a symmetrical shape with the connecting portion as a center.   Mounting corners are formed in the four corners of the rectangular frame, and the communication holes are sized so as not to reduce the mechanical strength of the portion where the through hole is formed. The blower finger guard according to claim 2.

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