JP3003729U - Axial fan motor - Google Patents

Abstract

(57) [Abstract] [Purpose] To form a screw hole for a tapping screw that does not easily crack in the casing of an axial fan motor. [Structure] An impeller 3 is attached to a rotary shaft of a motor, and two plate portions 5 are provided with a circular hole 4 larger than the diameter of the impeller 3 in the center at an interval equal to or greater than the thickness of the impeller 3 in the front-rear direction.
To provide. Then, the two plate portions 5 are joined by a plate body 7 to form a casing 2 having a substantially rectangular frame shape, and the casing 2 surrounds the impeller 3 in the axial flow fan motor 1. A casing mounting hole 8 is provided at each of the four corners of the casing, which is circular and is formed by connecting at least one recess 9 to a part of the inner periphery thereof.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of an axial fan motor provided in various office automation equipment and the like.

[0002]

[Prior art]

 In a case where a large number of electronic circuits are housed in the casing of an OA device, such as various OA devices, the heat generated by the electronic components may be trapped and damage the electronic components. Therefore, a ventilation hole is provided on the side wall of the casing, and an axial fan motor is attached to the ventilation hole to radiate the heat inside the casing to the outside.

The general structure of an axial fan motor of this type is that an impeller is attached to the rotary shaft of the motor, and a circular hole larger than the diameter of the impeller is formed in the center at an interval equal to or greater than the thickness of the impeller in the front-rear direction. Is provided, and the two plate portions are joined together by a plate body to form a casing having a substantially rectangular frame shape. The casing surrounds the impeller, and The impeller faces the hole. Then, at the four corners of the casing, circular holes for mounting the casing for mounting the casing to the OA equipment are provided.

When installing the axial fan motor in the casing of the OA equipment, a hole is formed in the casing of the OA equipment to allow the air of the axial fan motor to pass, and the axial flow is placed inside the casing at this hole. The casing of the fan motor is applied, and the casing of the axial fan motor is fixed with bolts that pass from the outside of the casing of the office automation equipment.

For this reason, a hole for bolt insertion is provided in the casing of the office automation equipment and the casing of the axial fan motor so that they are aligned with each other, and the bolt is passed through the hole from the outside and the bolt is passed through from the inside. The nut was screwed and fixed.

When the axial fan motor is fixed with bolts and nuts in this manner, the nuts must be screwed into the tips of the bolts that are passed from the outside, and then the nuts must be tightened, which is a complicated task. It was

Therefore, when the casing of the axial fan motor is made of synthetic resin, a hole (round hole) for mounting the casing is formed in a small size, and the hole is passed from the outside of the casing of the OA equipment. I was installing the tapping screw while raising it.

When the tapping screw is used as described above, the nut is not required and the labor for screwing the nut onto the bolt is not required, so that the number of parts and the number of working steps are reduced. .

[0009]

[Problems to be solved by the device]

 However, when using a tapping screw, when the tapping screw is screwed into the hole for mounting the casing, uniform stress (deformation) is generated around the hole and cracks occur in the weak part around the hole. There was a problem that occurred. When cracking occurs, there is a problem that the tightening strength of the tapping screw is reduced.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an axial fan motor in which the shape of a hole through which a tapping screw is inserted is changed to a shape other than a circle so that cracks do not easily occur. And

[0011]

[Means for Solving the Problems]

 According to a first aspect of the present invention, an impeller is attached to a rotary shaft of a motor, and two circular holes having a diameter larger than the diameter of the impeller are provided in the center at intervals equal to or greater than the thickness of the impeller in the front-rear direction. In an axial fan motor in which a plate portion is provided and a casing having a substantially rectangular frame shape is formed by connecting the two plate portions with a plate body, and the impeller is surrounded by the casing, four corners of the casing are provided. An axial fan motor, characterized in that a circular hole is formed, and a hole for mounting a casing is formed by connecting at least one concave portion to a part of the inner circumference thereof.

According to a second aspect of the present invention, the casing mounting holes provided at the four corners of the casing are square, and the sides thereof are inclined at 45 degrees with respect to the sides of the casing. And an axial fan motor.

According to a third aspect of the invention, the casing mounting holes provided at the four corners of the casing are formed into a polygon having a triangle shape or more, and the direction of the side is 45 degrees with respect to the direction of the side of the casing. It is an axial fan motor characterized by being tilted.

According to a fourth aspect of the present invention, an impeller is attached to a rotary shaft of a motor, and a circular hole larger than a diameter of the impeller is provided at a center of the impeller at an interval equal to or greater than a thickness in a front-rear direction. In the axial fan motor, wherein two plate parts are provided and a casing having a substantially rectangular frame shape is provided by connecting the two plate parts by a plate body, and the impeller is surrounded by the casing. Providing pillars at the four corners of the two plate parts constituting the casing to connect the plate parts to each other, the pillar and the part of the plate part connected to the pillar are circular and An axial fan motor having a casing mounting hole formed by connecting at least one recess to a part of the inner circumference.

According to a fifth aspect of the present invention, columnar bodies that connect between the plate portions are provided at four corners of the two plate portions that form the casing, and the columnar bodies and the columnar bodies are coupled to each other. The axial flow fan motor is characterized in that the casing mounting hole provided in the plate portion is formed into a square shape, and the sides thereof are inclined by 45 degrees with respect to the sides of the casing.

According to a sixth aspect of the present invention, columnar bodies that connect between the plate portions are provided at four corners of the two plate portions that form the casing, and the columnar bodies and the columnar bodies are coupled to each other. This is an axial-flow fan motor characterized in that the holes for mounting the casing provided in the plate portion are polygons of a triangle shape or more, and the sides thereof are inclined by 45 degrees with respect to the sides of the casing.

[0017]

[Action]

 According to the invention described in claim 1, since the casing mounting holes are formed in the four corners of the casing in a circular shape and at least one concave portion is connected to a part of the inner periphery thereof. The stress generated when the tapping screw is screwed into this hole is concentrated in the recess, and stress is not concentrated around the mounting hole. That is, the stress around the hole is reduced. This makes it possible to prevent cracking around the hole.

According to the invention described in claim 2, since the casing mounting holes are provided in the four corners of the casing in a square shape, the sides of which are inclined by 45 degrees with respect to the sides of the casing. , The stress generated when the tapping screw is screwed into this hole concentrates on the four corners, and the stress does not concentrate around the hole. This makes it possible to prevent the occurrence of cracks.

According to the invention described in claim 3, at the four corners of the casing, a polygonal shape of a triangle or more, the side of which is inclined 45 degrees with respect to the side of the casing The stress generated when the tapping screw is screwed into this hole is concentrated in the pointed part between the sides, and stress is not concentrated around the hole. This makes it possible to prevent cracking around the holes.

According to the invention as set forth in claim 4, columnar bodies for connecting the two plate portions are provided at the four corners of the two plate portions constituting the casing, and the columnar body and the plate portion are connected to each other. Since a hole for mounting the casing, which is circular and has at least one recess connected to a part of its inner circumference, is provided in the part, it occurs when the tapping screw is screwed into this hole. The resulting stress concentrates on the recess, and the stress does not concentrate around the mounting hole. This makes it possible to prevent the occurrence of cracks around the holes. According to the present invention, since the recess is formed inside the column, stress can be concentrated in the recess, and cracks around the hole can be surely prevented. become.

[0021] According to the invention described in claim 5, a column body that connects the two plate portions is provided at the four corners of the two plate portions that form the casing, and the column body and the plate portion are provided. Since a square hole was formed in the area for mounting the casing, the side of which is tilted 45 degrees with respect to the side of the casing, the stress that occurs when screwing the tapping screw into this hole is The stress will not be concentrated around the holes because it will be concentrated on the four corners. This makes it possible to prevent the occurrence of cracks. Further, according to the present invention, since the rectangular hole is formed inside the column, the stress can be concentrated on the corner portion of the rectangular hole, and the cracks around the hole can be cracked. Can be reliably prevented.

According to the invention as set forth in claim 6, a column body for connecting the two plate portions is provided at four corners of the two plate bodies forming the casing, and the column body and the plate body are provided. In the part of, is a polygon of triangles or more, and the side of the casing is inclined by 45 degrees with respect to the side of the casing.There is a hole for mounting the casing.Be sure to screw the tapping screw into this hole. Occasionally, the generated stress concentrates on the corners of the polygon, and does not concentrate on the outer periphery of the hole. This makes it possible to prevent the occurrence of cracks. Further, according to the sixth aspect, since a polygonal hole having a triangle shape or more is also provided inside the column body, stress can be concentrated at the corner portion of the hole, and the periphery of the hole can be surrounded. It is possible to reliably prevent cracking of the.

[0023]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. What is shown in FIG. 1 is an axial fan motor 1 to be installed in the casing of various office automation equipment. The axial fan motor 1 is roughly composed of a casing 2 and an impeller 3 attached to a rotating shaft of a motor (not shown).

In the casing 2, two plate portions 5 each having a circular hole 4 larger than the diameter of the impeller 3 in the center are arranged at an interval equal to or larger than the thickness of the impeller 3 in the front-rear direction. The space between 5 is connected by a cylindrical body 6 and a plate body 7 to form a substantially rectangular frame shape.

Then, the cylindrical body 6 of the casing 2 thus formed surrounds the impeller 3 to form the axial fan motor 1. At this time, the impeller 3 is surrounded so as to face the hole 4 of the plate portion 5. As a result, the wind tunnel is constructed when the impeller 3 rotates.

Further, at the four corners of the plate portion 5 of the casing 2, there are provided casing mounting holes 8 for mounting the casing 2 to the casing of the OA equipment. As shown in FIG. 2, the mounting hole 8 is composed of a circular hole 8A penetrating the plate portion 5 and a concave portion 9 connected to the circular hole 8A. .

The recesses 9 are formed at two locations on the inner circumference of the circular hole 8A. The recesses 9 are provided not on the four corners of the plate 5 of the casing 2 but on the sides 5a of the plate 5 of the casing 2.

That is, the recess 9 is formed with a radius of 0.5 mm to 2 mm at a symmetrical position inclined by 45 degrees with respect to the xy axes of the circular hole 8A as shown in FIG.

The recess 9 is provided in the casing mounting hole 8 as described above. When the mounting hole 8 is only the circular hole 8A, the periphery of the hole (particularly the corner portion of the plate portion 5) is the casing 2 This is to prevent resin welds (linear irregularities that occur when the resin flows are not completely fused) during molding, and the strength in the direction orthogonal to the welds becomes extremely weak when welds are formed. .

Therefore, the concave portion 9 is formed at a position avoiding a portion that easily becomes a weld, for example, at a position inclined by 45 degrees with respect to the xy axis.

Since this embodiment is configured in this way, the stress generated when the tapping screw is screwed into the mounting hole 8 of the plate portion 5 of the casing 2 is concentrated in the concave portion 9, and The stress does not concentrate around the hole 8, which is prone to weld the hole 8. This makes it possible to prevent the occurrence of cracks.

Two concave portions 9 are connected to the circular hole 8 of the plate portion 5, but a plurality of concave portions 9 may be formed, for example, four.

As described above, the shape of the mounting holes 8 formed at the four corners of the plate portion 5 of the casing 2 of the axial fan motor 1 is such that the concave portion 9 is connected to the circular hole 8A. Alternatively, as shown in FIGS. 4 and 5, the mounting hole 10 may be a square hole 10A and a corner 11.

In this case, the side 10a of the mounting hole 10 is formed so as to be inclined by 45 degrees with respect to the side 5a of the plate portion 5 of the casing 2 (see FIG. 5).

In the case of forming in this way, the stress generated when the tapping screw is screwed into the mounting hole 10 is concentrated on the four corners 11 of the mounting hole 10. . This makes it possible to prevent the occurrence of cracks.

Further, although not shown, the shape of the mounting holes formed at the four corners of the plate portion 5 of the casing 2 is not a circle or a square as described above, but is a triangle, and the direction of the side is the casing 2 It may be formed by inclining by 45 degrees with respect to the direction of the side 5a of the plate portion 5.

With this configuration, the stress generated when the tapping screw is screwed into the triangular hole is concentrated on the pointed portion between the sides of the triangle, that is, the corner portion. This makes it possible to prevent the occurrence of cracks.

It should be noted that stress can be avoided even if the mounting hole has a polygonal shape of a triangle or more, but if the mounting hole is made polygonal as it becomes closer to a circular shape, on the contrary, the portion where stress concentrates decreases. There is a risk of cracking, and it is necessary to set the angle appropriately.

Next, another embodiment of the present invention will be described with reference to FIG. 6, in which the same members as those in FIG. In the axial fan motor 12 shown in FIG. 6, the four corners of the two plate parts 5 of the casing 2 are connected by the pillars 13, and further, the pillars 13 and the plate part 5 with which the pillars 13 abut. A hole 14 for mounting a casing, which is composed of a circular hole 14A and a concave portion 15, is provided in the portion.

The recesses 15 are formed at two locations on the inner circumference of the circular hole 14A so as to be connected to the circular hole 14A. As shown in FIG. 7, the casing mounting hole 14 is also formed inside the column 13 along the longitudinal direction. Therefore, the recess 15 is also formed inside the column 13.

Since the other embodiments are configured as described above, the stress generated when the tapping screw is screwed into the mounting hole 14 of the plate portion 5 of the casing 2 is concentrated in the concave portion 15, Stress will not be concentrated around the mounting holes 14 where welds tend to occur. This makes it possible to prevent the occurrence of cracks around the holes 14.

In the other embodiment, since the hole 8 for mounting the casing is also formed inside the column 13, the stress can be concentrated in the concave portion 15 as much and the occurrence of cracking is surely performed. It becomes possible to prevent it.

Two recesses 15 provided in the mounting hole 14 are provided around the mounting hole 14, but a plurality of recesses 15 may be provided instead of this. This also makes it possible to prevent cracking.

As described above, the mounting hole 14 of the other embodiment is formed by the circular hole 14A and the concave portion 15 connected to the inner circumference of the circular hole 14A. The plate portion 5 may be provided with an attachment hole including the hole and the corner portion. In this case, the direction of the side is inclined by 45 degrees with respect to the direction of the side 5a of the plate portion 5 of the casing 2.

The stress generated when the tapping screw is screwed into the casing mounting hole as described above is concentrated on the four corners of the mounting hole, whereby cracking is prevented. It becomes possible to prevent.

In the casing mounting hole of the other embodiment, since the rectangular hole is also formed inside the columnar body 13, stress can be concentrated in the corner portions, and cracks around the hole are caused. Can be reliably prevented.

Further, in another embodiment, the shape of the hole for mounting the casing may be triangular, and the direction of the side may be inclined by 45 degrees with respect to the direction of the side 5a of the plate portion 5 of the casing 2.

The stress generated when the tapping screw is screwed into this hole is concentrated on the corners of the triangle. This makes it possible to prevent the occurrence of cracks. Since the hole for mounting the casing is also formed inside the columnar body 13, stress can be concentrated on the corners of the triangle, and cracks around the hole can be surely prevented.

[0049]

[Effect of device]

 According to the inventions of claim 1 and claim 4 configured as described above, the four corners of the casing plate portion are circular, and at least one recess is connected to a part of the inner periphery thereof. Since the casing mounting hole formed as described above is provided, the stress generated when the tapping screw is screwed into the hole is concentrated in the recess. As a result, the occurrence of cracks in the mounting holes can be prevented, and stable tightening strength can be maintained.

Further, according to the invention as set forth in claim 4, since the casing mounting hole having the concave portion is formed in the inner portion of the column body that joins the two plate portions of the casing, the stress in the concave portion is increased accordingly. Can be concentrated, and the occurrence of cracks around the holes can be reliably prevented. This also makes it possible to maintain a stable tightening strength.

Further, in the inventions according to claims 2 and 5, a rectangular casing mounting hole is formed in the plate portion of the casing, and the direction of the side of the hole is 45 with respect to the direction of the side of the casing. Since it is formed with a tilt, the stress generated when the tapping screw is screwed into this square hole is concentrated on the four corners. As a result, it is possible to prevent the occurrence of cracks around the holes and maintain stable tightening strength.

Further, in the invention according to claim 5, since the rectangular hole for mounting the casing is formed also in the inner portion of the column body that joins the two plate portions of the casing, only the square corner portion is formed. You can concentrate your stress. As a result, cracking can be reliably prevented and stable tightening strength can be maintained.

Further, in the inventions according to claims 3 and 6, a polygonal hole of a triangle or more is formed in the plate portion of the casing, and the direction of the side of the hole is set to the direction of the side of the casing. Since it was formed with an inclination of 45 degrees, the stress generated when the tapping screw is screwed into this hole is concentrated in the corners of the polygon above the triangle. As a result, cracking can be prevented and stable tightening strength can be maintained.

Further, in the invention described in claim 6, since a polygonal hole of a triangle shape or more for mounting the casing is also formed inside the column body, the corner of the polygonal hole of a triangle shape or more is formed. You can concentrate stress on the part. As a result, the occurrence of cracks can be reliably prevented, and similarly, stable tightening strength can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a portion A of FIG.

FIG. 3 is a front view of a portion A of FIG.

FIG. 4 is a perspective view of an axial fan motor having a rectangular mounting hole.

5 is a front view of a B part in FIG. 4. FIG.

FIG. 6 is a perspective view showing another embodiment.

7 is an enlarged perspective view of a C portion of FIG.

[Explanation of symbols]

 1 Axial fan motor 2 Casing 3 Impeller 4 Hole 5 Plate 5a Side 7 Plate 8 Casing mounting hole 8A Circular hole 9 Recess 10 Casing mounting hole 10A Square hole 10a Side 11 Square 12 Axial fan Motor 13 Column 14 Casing mounting hole 14A Circular hole 15 Recess

Claims (6)

[Scope of utility model registration request] 1. An impeller is attached to a rotating shaft of a motor, and two plate portions having circular holes larger than a diameter of the impeller are provided at a center of the impeller at an interval equal to or greater than a thickness of the impeller in a front-rear direction. In an axial fan motor in which two plate portions are connected by a plate body to form a substantially rectangular frame-shaped casing, and the impeller is surrounded by the casing, the four-corner portions of the casing are circular and An axial fan motor having a casing mounting hole formed by connecting at least one recess to a part of the inner periphery thereof. 2. The shaft according to claim 1, wherein the holes for mounting the casing provided at the four corners of the casing are formed in a square shape, and the sides of the holes are inclined 45 degrees with respect to the sides of the casing. Flow fan motor. 3. The casing mounting holes provided at the four corners of the casing are formed in a polygonal shape of a triangle or more, and the sides thereof are inclined by 45 degrees with respect to the sides of the casing. The axial fan motor described in 1. 4. An impeller is attached to a rotary shaft of a motor, and two plate portions having circular holes larger than a diameter of the impeller in the center are provided at intervals equal to or greater than the thickness of the impeller in the front-rear direction. In an axial fan motor in which a casing having a substantially rectangular frame shape is provided by connecting between two plate portions with a plate body, and the impeller is surrounded by the casing, the two plate portions of the casing are formed. A column body is provided at each of the four corners for coupling between the plate portions, and the column body and a portion of the plate portion coupled to the column body are circular, and at least one recess is provided in a part of an inner circumference thereof. An axial fan motor, characterized in that a casing mounting hole is formed by connecting the two. 5. A casing provided at four corners of two plate portions forming a casing with pillars connecting the plate portions to each other, and a casing provided at the pillar body and a portion of the plate portion connected to the pillar body. The mounting hole is formed in a square shape, and the direction of its side is inclined by 45 degrees with respect to the direction of the side of the casing.
The described axial fan motor. 6. A column body is provided at four corners of the two plate portions forming the casing, the column body connecting the plate portions to each other, and the column body and the plate portion connecting to the column body are provided. The axial fan motor according to claim 4, wherein the hole for mounting the casing has a polygonal shape of a triangle or more, and the direction of the side is inclined by 45 degrees with respect to the direction of the side of the casing.