JP3247494B2 - Juan motor casing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small fan motor, and more particularly to a casing for the fan motor.

[0002]

2. Description of the Related Art Small fan motors are widely used, for example, for various devices such as OA equipment, medical equipment, research and experiment equipment, and other devices for preventing heat generation in equipment incorporating many electronic components. ing. FIG. 8 and FIG. 9 show an example of use as a device for preventing heat generation. In these figures, a fan motor 1 includes an upper casing 2 having a rectangular planar shape, a lower casing 3 also having a rectangular planar shape, and a drive including a propeller-shaped impeller 4 housed in the upper casing 2. And an axial fan motor having: The upper casing 2 and the lower casing 3 define a space in which the drive part rotates. The upper casing 2 has a plurality of openings 5 around the upper surface through which air can freely flow, and a connecting portion 7 having blind holes 6 (see FIG. 9) at each of the four corners is integrally provided. On the other hand, the lower casing 3 includes a heat sink or heat radiating plate 9 rising from the periphery of the bottom 8 having a blind bottom or a circular or other punched window (not shown) as shown in the figure, and the upper casing 2 at each of the four corners. Protrusion 10 to be received in blind hole 6
And a connecting portion 11 provided with: Impeller 4
The bowl-shaped rotating member 12 includes a plurality of blades 13 protruding from an outer peripheral portion of the bowl-shaped rotating member 12, and a through-hole provided in a central portion of the bowl-shaped rotating member 12 has a rotating shaft 14. The rotating shaft 14 is rotatably supported via a bearing 15 in a cylindrical recess provided at the center of the upper casing 2. A rotor magnet 16 is attached to the inner peripheral surface of the bowl-shaped rotating member 12 via a yoke, and the bowl-shaped rotating member 12, the yoke, and the rotor magnet 16 form a rotor 17. Further, a cylindrical recess provided at the center of the upper casing 2 has a stator core having a plurality of teeth arranged along a circumferential direction, and a coil wound around the teeth of the stator core. 18 is externally fitted. In use, the bottom 8 of the lower casing 3 constituting the fan motor 1 is
It is arranged in contact with a component 20 such as an IC arranged on the substrate 19. Next, when the fan motor 1 is rotated via the power line 21, the impeller 4 of the driving portion rotates, and passes through the heat radiating plate 9 from the opening 5 in the upper casing 2 through the bottom surface 8 of the lower casing 3 in the figure. A bleeding air flow path is formed. In this way, the heat generated from the IC components 20 is sufficiently dissipated, and the components and the like are greatly prevented from being damaged.

[0003]

As described above, the conventional fan motors themselves provide extremely efficient working characteristics. However, in the conventional fan motor casing, when assembling the upper and lower two casings, one casing is disposed directly above the other casing, and the two casings are assembled while adjusting the positions of the two casings while keeping them parallel to each other. This requires careful attention and skill in assembling the casing. Also, in the case of a device to which such a fan motor is attached, the upper casing and the lower casing of the fan motor are moved when the device is moved, carried, or operated, and receives some impact. There is a problem that the fan motor is easily separated and the fan motor does not operate properly.
This is because in the conventional fan motor, the upper casing and the lower casing are assembled by a method in which the protrusion having the same diameter is simply fitted into the blind hole having the same diameter. In order to solve this problem, after assembling the upper casing and the lower casing, they may be fixed to each other by gluing, screwing, or other fixing means. However, such a measure is not a preferred solution because it involves an increase in the number of working steps and parts. Therefore, there is an urgent need to connect the two casings quickly and easily without separating the casings by using very simple means without increasing the number of working steps and parts. An object of the present invention is to solve such a problem.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, when assembling an upper casing and a lower casing, a projection having a constant diameter is similarly fitted into a blind hole having a constant diameter. Instead, one of the casings is provided with a pawl for preventing separation, and the other casing is provided with a pawl receiving portion for receiving the pawl, and thus the two pawls and the pawl receiving portion are simultaneously assembled. The engagement prevents the separation of the two completely. In another embodiment, instead of the conventional method of fitting a projection having a constant diameter into a blind hole having a constant diameter, each of the blind hole and the projection is formed into a special shape, When assembling the casings, they are engaged with each other so that they cannot be pulled out, and thus the separation of both casings is completely prevented.

[0005]

According to the present invention, the upper casing and the lower casing are formed by a pawl for preventing separation and a pawl receiving portion for receiving the pawl, and furthermore, by a blind hole having a special shape and a protruding portion. Are inseparably combined with each other,
In this way, accidental separation of the two casings is prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. 1 to 3 show a first embodiment of the present invention, and FIGS. 4 to 7 show another embodiment of the present invention.

The fan motor 30 of the first embodiment shown in FIGS. 1 to 3 is a known fan motor 1 shown in FIGS.
The difference is that the flange portions 34, 34 desirably extend integrally with at least one pair of corners on one diagonal of the upper casing 32 having a substantially rectangular planar shape, and at the same time, The flange portions 38, 38 preferably extend integrally with at least one pair of corners on one diagonal of the lower casing 36, which has a generally rectangular shape. In other respects, for example, the configuration of driving parts such as an impeller, a rotor magnet, a rotor, and a stator attached to the upper casing 32, and a method of attaching them, and further, a radiating plate and the like provided on the lower casing 36 There is no substantial difference in the configuration. Therefore, in the following, these different points will be mainly described.

Each flange portion 34 of the upper casing 32 made of a flexible material such as a synthetic resin material or a thin metal material is provided with a hanging portion 40 hanging downward from the outer peripheral edge thereof. At the lower end of the hanging portion 40, a pawl 42 protruding inward of the casing 32 is formed, forming a pawl flange. Further, a projection 44 having substantially the same diameter is desirably formed integrally with the casing on the lower surface side of each corner of the upper casing 32 having a substantially rectangular planar shape.

On the other hand, a lower casing 36, which is also preferably made of a flexible material, has a bottom plate 46 and couplings provided at four corners of the bottom plate, similarly to the known lower casing 3 shown in FIG. And a heat radiating plate 50 provided between the connecting portions 48 and rising from the four side edges of the bottom plate 46. Lower casing 36 of the present case
Is a pair of connecting portions 48 further disposed on one side on a diagonal line.
The flange portion 38 is formed on the upper surface portion of the first member.
The flange portion 38 functions to receive the pawl 42 of the flange portion 34 provided on the upper casing 32, and forms a pawl receiving flange. Further, a blind hole 52 for receiving the projecting portion 44 provided on the upper casing 32 is provided on the upper surface of the connecting portion 48.

Upper casing 32 and lower casing 36
When assembling, first, the upper casing 32 in which driving parts such as an impeller, a rotor magnet, a rotor, and a stator are attached in advance by a known procedure, the projection 44 of the upper casing 32 is mounted on the lower casing 36. The lower casing 36 is disposed at a position facing the blind hole 52. Next, the two casings 32 and 36 are brought close to each other, and the protrusion 44 of the upper casing 32 is inserted into the blind hole 52 of the lower casing 36. Upper casing 32
As the protrusion 44 of the lower casing 36 enters the blind hole 52 of the lower casing 36, the claw 42 provided on the flange 34 of the upper casing 32
8 slides down along the outer edge. At this time, hanging part 4
Since the O moves elastically outward, the slide between the pawl 42 and the flange portion 38 is performed extremely smoothly. When the projection 44 of the upper casing 32 completely enters the blind hole 52 of the lower casing 36, the upper casing 3
The second pawl 42 is a flange portion 38 of the lower casing 36.
And is elastically fitted to the lower surface of the flange portion 38. As a result, the two casings accurately positioned by the protrusion 44 of the upper casing 32 and the blind hole 52 of the lower casing 36 are connected to the upper casing 3.
Second pawl 42 and flange portion 38 of lower casing 36
It is assembled in an inseparable state by fitting.

The relationship between the pawl and the flange portion will be described in more detail with reference to FIG. 3. The pawl 42 is formed from the inner surface of the hanging portion 40 hanging from the outer edge of the flange portion 34 formed integrally with the upper casing 32. It comprises a fitting surface 54 protruding inward at a substantially right angle, and an inclined surface 56 extending from the inner end of the fitting surface 54 to the outer surface of the hanging portion 40. On the other hand, the flange portion 38 provided on the upper surface of the connecting portion 48 of the lower casing 36 has a pawl receiving portion 58 projecting outward at substantially right angles from the connecting portion 48, and a connecting portion from the outer end of the pawl receiving portion 58. Inclined surface 6 reaching the upper surface of 48
0. A blind hole 5 for receiving the protrusion 44 of the upper casing 32 is provided on the upper surface of the connecting portion 48.
2 are provided. In the present invention, the upper casing 3
Inclination angle a of the second inclined surface 56 is smaller than or equal to the inclination angle b of the inclined surface 60 of the lower casing 36, i.e., a ≦ b is rather desirable, also, the length of the hanging portions 40 e Is preferably equal to or greater than the length f of the protrusion 44, that is, f ≦ e. At this time,
When the rings 32 and 36 are assembled together, f ≦ e
Before the projection 44 reaches the blind hole 52,
The inclined surface 56 moves along the inclined surface 60 of the flange portion 38.
And the inner side of the inclined surface 56 of the pawl 42 is maximal due to a ≦ b.
First, it contacts the inclined surface 60 of the flange portion 38 and
0 is easily elastically deformed. For this reason, the
The lower casing 32 has a lower casing
Guided by the thing 36, the protrusion 44 and the blind hole 52
Can be achieved very quickly and easily. Therefore,
While looking at the lower side of the upper casing 32 during assembly
The upper casing 32 is moved to a predetermined position of the lower casing 36.
To assemble these casings while placing them
No kneading work is required. Further the claw length c of the fitting surface 54 of 42 be less than or equal to the thickness d of the downwardly extending portion 40, i.e. c ≦ d is preferable. This is for maintaining the strength of the nail portion.

In this embodiment, the pawl flange 34 and the projection 44 are provided on the upper casing 32, and the pawl receiving flange 38 and the blind hole 52 are provided on the lower casing 36. However, this is not an essential requirement. As needed,
Naturally, the upper casing may be provided with a pawl flange and a blind hole, and the lower casing may be provided with a pawl receiving flange and a projection, or vice versa.
Further, the upper casing and the lower casing can be assembled in an upside-down position, and the drive portion can be provided in the lower casing. Further, although the bottom surface 46 of the lower casing 36 in the embodiment is constituted by a closing plate, an opening for ventilation can be provided here. The same applies to the following embodiments.

Another embodiment of the present invention, shown in FIG. 4, is that the pawl flange 62 hangs down from a pair of opposing side edges across the center of the upper casing, and the pawl receiving flange 64 for receiving it hangs on the lower casing. It is formed as a stepped portion on the heat sink. Also in this embodiment, when the two casings are assembled, the pawl flange 62 and the pawl receiving flange 64 are elastically fitted to prevent separation of the two.

In the above two embodiments, the flanges are preferably provided on both sides of the central portion of the casing, and it is difficult to prevent complete separation if only one side is used. It is known.

Another embodiment of the present invention, shown in FIGS. 5-7, relates to the shape of the protrusion and can be used with and with the pawl flange and pawl receiving flange described above. An object of the present invention is to provide a projection and a blind hole which can sufficiently achieve an intended purpose even with only the projection and the blind hole without using a flange. That is, in FIG. 5, a slightly deformed spherical projection 72 (a projection
) , While the lower casing 74 has a slightly deformed spherical space 76 (for receiving the protrusion) for receiving the same.
The projection 72 is fitted into the cavity 76. In this case, as long as at least the material forming the projection 72 is made of a material that can be deformed to some extent, for example, a synthetic resin material, the fitting can be reliably achieved even if the material forming the space 76 is a material that is difficult to deform. What we can do has been found in our experiments. FIG. 6 shows the upper casing 80.
A slightly deformed spherical cavity 82 (a hole for receiving a protrusion)
The equivalent) in provided, whereas, corresponding to the projection 86 (projection of the spherical been somewhat deformed to be fitted to the lower casing 84)
Are provided, and the projections 86 are fitted into the voids 82.
The embodiment shown in FIG. 5 is different from the embodiment shown in FIG. FIG. 7 shows an example in which the protrusion of the embodiment of FIG. 6 is further modified to a spade-shaped protrusion 90 (corresponding to a protrusion ) . The embodiment of FIG. 5 is most suitable for assembling both casings while moving the upper casing to the lower casing side, and the embodiment of FIGS. 6 and 7 is for assembling both casings while moving the lower casing to the upper casing side. Ideal for The embodiment shown in FIG. 6 is most suitable for assembling both casings so that they can be disassembled as required.
The embodiment of the present invention is most suitable when both casings are assembled so as not to be disassembled. Thereby, in the embodiment of FIGS.
Are projections 72, 86, 90 to be received in the voids 76, 82.
Are formed into a slightly deformed spherical shape, and such projections 72, 8
6,90 prevents the casing from slipping out of each other
ing. For this reason, equipment that hardly moves equipment
In the installation, only such deformed protrusions
Achieving the initial goal sufficiently. Equipment that moves fast
In the embodiment shown in FIGS. 5 to 7 and FIGS.
And the pawl flange and the pawl receiving flange of the embodiment shown in FIG.
The combination of the safe fan is very difficult to separate
A motor casing can be provided.

[0016]

According to the first aspect of the present invention , when assembling the upper and lower casings with each other, the upper and lower casings are provided on one of the casings.
The pair of protrusions receives the protrusions provided on the other casing.
In addition to the fitting holes, the plurality of pawl flanges provided on one casing are automatically elastically fitted to the plurality of pawl receiving flanges provided on the other casing, and both casings are completely tightened. To hold. For this reason, even when the equipment to which the fan motor according to the present invention is attached is subjected to any impact during movement, carrying, or during operation, the upper casing and the lower casing of the fan motor can be easily formed. Thus, the problem that the fan motor does not operate properly without being separated into two pieces has been completely solved . In the invention according to claim 2, one of the casings
The inclination angle a of the inclined surface of the pawl flange is
Smaller than the slant angle b of the slant surface of the flange receiving flange
Whether the length e of the hanging part is equal to the length f of the protrusion
Or larger, so that the inclined surface of the pawl receiving flange
Hold the upper part, and the inclined surface of the flange slides smoothly, and both casings
Can be achieved extremely smoothly. More nail franc
Since the length c of the fitting surface of the die is equal to or less than the thickness d of the hanging portion, the strength of the nail portion is very strong, and the defect that the nail portion is unexpectedly broken is eliminated. Furthermore, in the invention according to claim 3, by disposing these pawl flanges and pawl receiving flanges on other diagonals in the same manner, the separation between the casings can be further restricted.

[0017] Further, the invention according to claim 4, depending from side edges a pair of pawls <br/> flange is a pair of opposing of one of the casing, the claw receiving flange for receiving this on the other of the casing It is formed on the side edge . This allows the casing to be more compact in shape and suitable for use in narrow equipment.

Further, in the invention according to claim 5, the pawl franc
The projection is deformed in addition to the fitting between the jaw and the receiving flange
The spherical shape of the case
To prevent the ring from coming off. By combining these fitting structures , it is possible to provide a safe fan motor casing that is very difficult to separate.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a fan motor casing showing a first embodiment of the present invention.

FIG. 2 is an assembled cross-sectional view of the fan motor casing showing the first embodiment of the present invention, and is a view taken along line 2-2 in FIG.

FIG. 3 is a partially enlarged view of a fan motor casing showing the first embodiment of the present invention.

FIG. 4 is an exploded perspective view of a fan motor casing showing a second embodiment of the present invention.

FIG. 5 shows another embodiment of the present invention, in which a deformable projection is formed on an upper casing.

FIG. 6 shows still another embodiment of the present invention, in which a deformable projection is formed on a lower casing.

FIG. 7 shows still another embodiment of the present invention, in which a deformable projection provided on a lower casing is further deformed.

FIG. 8 is an exploded perspective view of a known fan motor casing.

FIG. 9 is an assembled sectional view of a known fan motor casing.

[Explanation of symbols]

 Reference Signs List 30 fan motor 32 upper casing 34 flange portion 36 lower casing 38 flange portion 40 hanging portion 42 pawl 44 projecting portion 46 bottom plate 48 connecting portion 50 radiator plate 52 blind hole 54 fitting surface 56 inclined surface 58 nail receiving portion 60 inclined surface 62 nail Flange 64 Catch receiving flange 70 Upper casing 72 Projection 74 Lower casing 76 Empty space 80 Upper casing 82 Empty space 84 Lower casing 86 Projection 90 Projection

Claims (5)

(57) [Claims] 1. A fan motor casing which houses the fan motor inside a casing having a plurality of projections made of a separate casing having a plurality of holes for receiving the projecting portions, one of the casing A fan motor casing characterized in that at least a pair of pawl flanges are provided at portions facing each other via a hanging part, and a pair of pawl receiving flanges for receiving these pawl flanges are provided on the other casing. 2. The pawl flange has a fitting surface and an inclined surface, and the pawl receiving flange has a pawl receiving portion and an inclined surface elastically fitted to the fitting surface, and the inclined surface of the pawl flange. the angle a pawl receiving flange smaller than the angle b of the inclined surfaces of the length c of the fitting surface of the pawl flange is not more or less equal to the thickness d of the hanging portion, the length e of the hanging portion projecting Department head
The fan motor casing according to claim 1, wherein the height is equal to or greater than f . 3. The fan motor casing according to claim 1, wherein the pawl flange and the pawl receiving flange are respectively provided on diagonal lines of the casing. 4. The fan motor casing according to claim 1, wherein the pawl flange and the pawl receiving flange are respectively provided at opposing portions on both side edges across the center of the casing. 5. A according to claim 1 to 4 holes to accept no and projecting portion of the spherical protruding portion is deformed is generally similar in shape the fan motor casing.