JPH07269490A - Air blower - Google Patents

Abstract

PURPOSE:To make it compact in size and lighter in weight in narrowing an internal void in a housing as well as to reduce the extent of noises by forming this housing by both first and second cover members through resin material and simultaneously installing a strut in this internal void lying between both these cover members. CONSTITUTION:Air inhaled from an inlet hole 4 of a housing by what a cross flow impeller 1 is rotated and driven is delivered to the outside from an exhaust hole 5. In this connection, this housing 6 is made up of both first and second cover members 7 and 8 through resin material, while in an interval between these cover members 7 and 8, two struts 10 and 12 to statedly maintain an internal void being regulated by these cover members are interposed between these members 7 and 8. Therefore, even if deformation due to forming strain of the resin material is produced in the housing 6, this internal void is maintained as specified owing to these struts 10 and 12. Accordingly, aside from the promotion of being lightweight due to thin-walledness, the housing inside is set up in a high density manner, whereby any loss in suction and exhaust of air is reducible, so a whistling noise is also reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower which is incorporated in various office automation equipment and the like and is used for cooling a heat generating member mounted inside.

[0002]

2. Description of the Related Art Various kinds of OA equipment such as personal computers and printers have recently been reduced in size and weight. Along with this, the mechanical devices and electronic components mounted inside the equipment have a high density and high density. Therefore, the fan and the blower for cooling the inside are indispensable components and small-sized. The weight is reduced. On the other hand, in order to improve the usage environment, it is desired that such a device as described above be designed to be quiet in which noise, vibration, etc. generated from inside the device are suppressed as much as possible.

By the way, there is a blower such as a so-called sirocco fan or blower having a cross-flow impeller for discharging air in a radial direction with respect to a rotating shaft. The impeller and the housing configured as described above are usually formed by using a resin material in response to the above-mentioned reduction in size and weight. That is, the impeller and the housing are formed into a predetermined shape by injection molding with a resin material.

[0004]

However, according to the above-mentioned blower, the resin-molded impeller and the housing are complicated in shape and the heat shrinkage after molding is accompanied by the reduction in thickness due to miniaturization. Distortion is likely to occur due to the action. As a result, due to the molding strain, the impeller and the housing are deformed such as warped and bent.
In particular, in a cover member having a shape in which a flat surface and a side surface are formed vertically, such as a cover member having one end opened,
Due to the molding strain, the angle is not 90 degrees or less instead of being vertical.

Therefore, in a blower in which one housing is formed by two cover members, the inner space of the housing is substantially narrowed, and as a result, the inner wall of the cover member is housed inside the housing. This causes a problem of contact with the impeller or the like. For this reason, the components such as the housing and the impeller have to be made thick in advance and have a design and a shape with a dimensional margin as much as possible, which is a limitation in reducing the size and weight. .
Further, in such a configuration, a loss occurs in the intake and exhaust of air, so-called wind noise becomes loud, and there is still room for various measures to reduce noise.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a blower which can be reduced in size and weight and which has good silent characteristics.

[0007]

In order to achieve the above object, a blower of the present invention rotates a cross flow impeller by a cross flow impeller for discharging air in a radial direction with respect to a rotating shaft, and a stator and a rotor magnet. A rotation driving means for driving, a cross-current impeller and a housing that houses the rotation driving means, and a housing that also receives an intake hole and a discharge hole are provided, and the cross-current impeller is driven to rotate,
In a blower in which the air sucked from the suction hole of the housing is sent to the outside from the discharge hole; the housing is made of a resin material, and the first cover member and the second cover member are provided.
Of the cover member, and these are provided so as to face each other, and an internal space defined by these is provided between the first cover member and the second cover member.
A support column for maintaining a predetermined value is provided so as to be interposed.

Further, in the blower, it is preferable that the support column is provided in an air flow passage acted by a cross flow impeller and is formed in a streamline shape corresponding to the air flow.

[0009]

According to the blower having the above-described structure, the internal space defined by the first cover member and the second cover member, which form the housing, is maintained to be predetermined. A pillar is provided. Therefore, the resin material is used for the housing, and even if the housing is deformed due to the molding strain, the pillar maintains the predetermined internal clearance. Therefore, in addition to reducing the weight by using a resin material and reducing the wall thickness, the components housed inside the housing can be arranged at a high density.
Therefore, it is possible to easily reduce the size of the blower.
Further, since the inside of the housing is arranged at a high density, the loss of intake / exhaust of air can be reduced, so that the wind noise is reduced, and thus a low noise blower can be obtained.

In the air flow passage, the column is formed in a streamlined shape corresponding to the air flow.
For this reason, since the support column does not hinder the air flow at all, it does not cause noise generation, and noise reduction of the blower can be realized.

[0011]

Embodiments of the blower according to the present invention will be described with reference to the accompanying drawings. 1 to 5 show a blower of this embodiment, FIG. 1 is its plan view, FIG. 2 is a bottom view,
3 is a side view of FIG. 1 as viewed from right to left, FIG.
Is a side view similarly seen from the left to the right, and FIG. 5 is an overall sectional view seen from the arrow AA of FIG. 6 and 7
[Fig. 4] is an internal plan view in a state in which cover members on opposite sides are removed. And in these figures,
Similar parts and members are designated by similar reference numerals.

In these drawings, the member 6 is the housing of the blower, and is made of ABS or PBT mixed with glass powder.
It is formed using an electrically insulating resin material such as. The housing 6 has an upper lid 7 which is a first cover member.
And a lower lid 8 which is a second cover member. All of these are formed by injection molding.
The upper lid 7 and the lower lid 8 are formed symmetrically, and the housing 6 is integrally formed by fitting these two together. At this time, the discharge holes 5 of the blower are demarcated by the openings 34, 35 opened at the respective side ends.

The fixing to the upper and lower lids 7 and 8 is temporarily held by the engaging portions 16 formed by projecting outward from the respective side walls 26 and 25. The engaging portion 16 is held by engaging the engaging protrusion 14 provided on the upper lid 7 with the engaging recess 15 provided on the lower lid 8. Then, after the upper and lower lids 7 and 8 are temporarily held by the engaging portion 16, the screws 19 are screwed into the protruding portions 17 provided on the side walls 26 and 25, so that both are tightly fixed. .

The flat portion 33 of the upper lid 7 is provided with four substantially triangular suction holes 4 in an annular shape, and a base portion 20 is formed in a central portion surrounded by the suction holes 4. Base 20
Is provided with a cylindrical portion 21 on which a pair of bearings 28 and 29 are mounted. In addition to the side wall 26, the flat lid 33, the base portion 20, and the cylindrical portion 21 are integrally formed on the upper lid 7.

A shaft 30 is rotatably supported by the cylindrical portion 21 via bearings 28 and 29, and the crossflow impeller 1 is fixed to the lower end of the shaft 30. The lateral flow impeller 1 is made of a resin material such as ABS or PBT mixed with glass powder, and is formed by injection molding similarly to the housing 6. The impeller 1 has a central base portion 24 to which a shaft 30 is fixed, a cylindrical wall 22 coaxially erected from the base portion 24, and further blades 23 provided on the outer peripheral side of the cylindrical wall 22 and arranged in the circumferential direction. And are formed integrally by injection molding. Therefore, the air sucked from the suction hole 4 is discharged in the radial direction with respect to the rotation axis by the circumferential movement of the plate 23 due to the rotation of the impeller 1, and the air is discharged from the discharge hole 5 to the outside. That is, the impeller 1 forms a crossflow fan.

The rotor magnet 3 is attached and fixed to the inner peripheral portion of the cylindrical wall 22 of the impeller 1. The rotor magnet 3 is formed of a rubber magnet, a plastic magnet, or the like, and has N poles and S poles alternately magnetized in the circumferential direction. The stator 2 is arranged so as to face the rotor magnet 3 in the radial direction. The stator 2 includes a core and an armature coil wound around the core. The stator 2 is externally fitted to the cylindrical portion 21 of the upper lid 7, and is connected and fixed to the printed circuit board 31 fixed to the base portion 20. Electronic components for exciting the stator are mounted on the printed circuit board 31, and the lead wires 27 are provided.
It is led to the outside via. As a result, the lead wire 27
When a predetermined electric signal is applied to the impeller 1, the impeller 1 is rotationally driven by the electromagnetic interaction between the stator 2 and the rotor magnet 3. The stator 2 and the rotor magnet 3 form the rotation driving means of the blower.

FIG. 6 shows the housing 6 of this blower.
(A) is a plan view of the state in which the lower lid 8 is removed, (b)
Is a side view thereof. Similarly, FIG. 7 is a plan view showing a state in which the upper lid 7 is removed, and FIG. 7B is a side view thereof. As shown in FIG. 6, the flat portion 33 of the upper lid 7 is provided with struts 10 and 12 in a protruding shape so as to face the lower lid 8. These are formed substantially vertically. Also, FIG.
As shown in FIG. 5, recesses 11 and 13 are formed in the lower lid 8 so as to correspond to the columns 10 and 12, respectively. The recesses 11 and 13 are formed so as to conform to the shapes of the tips of the columns 10 and 12. Therefore, the columns 10 and 12 are
When the upper and lower lids 7 and 8 are fitted together to be integrally formed,
They are fitted and fixed in the corresponding recesses 11 and 13, respectively.

The lengths (height) of the columns 10 and 12 are set as follows. That is, pillar 1
By fitting and fixing 0 and 12 into the recesses 11 and 13, the gap width (axial dimension) of the inner space 9 between the upper and lower lids 7 and 8 is defined. By setting in this way,
Even if the upper and lower lids 7 and 8 have molding distortion due to heat shrinkage due to injection molding, if these are integrated together, the pillar 1
The internal void 9 is maintained at a predetermined value by 0 and 12. Therefore, the impeller 1 is prevented from coming into contact with or hitting the inner surface of the flat portion 32 of the lower lid 8.

In particular, even if a resin material is used for the housing 6 or the like or the wall thickness is thinned in order to achieve a thin shape, a small size, or a light weight, the deformation due to the molding strain is caused by these pillars 10 and 12. Can be corrected by. Therefore, it is possible to promote the reduction in size and weight. The dimensions can be set so that the gap between the housing 6 and the impeller 1 housed inside the housing 6 can be made as small as possible, so that the internal parts can be arranged at a high density, and the size and weight can be reduced. Can be promoted. Further, with this configuration, the loss of air intake / exhaust due to the rotation of the impeller 1 can be reduced, so that the wind noise is reduced, and thus a blower with low noise can be obtained.

The columns 10 and 12 are provided in regions where the upper and lower lids 7 and 8 are easily deformed in the regions that do not contact the impeller 1 themselves. In the present embodiment, although there are two locations in the illustrated example, the location and the quantity to be provided can be set appropriately depending on the shape of the housing. In addition, as shown in FIG. 6A, the columns 10 and 12 are provided in the air flow passage that acts by the rotational drive of the impeller 1. Therefore, the columns 10 and 12 are formed in a streamlined shape having a small air resistance with respect to the generated airflow. This allows
Since the columns 10 and 12 do not hinder the air flow, they do not cause noise and the blower can be reduced in noise.

In the illustrated example, the tips of the columns 10 and 12 are fitted and fixed in the corresponding recesses 11 and 13, but in addition to this, fixing by adhesion or the like can also be adopted. It is also possible to provide a hole instead of the recesses 11 and 13 and insert a protrusion provided on the support into the hole to fit and fix it. Further, instead of the concave portion, two pieces of wall portions corresponding to the columns may be provided, and the columns may be sandwiched between the wall portions. As for the structure of the support column, one having a length corresponding to the internal void 9 may be used, and both ends or one of these may be welded and fixed by ultrasonic irradiation.

Although the embodiment of the blower according to the present invention has been described above, the present invention is not limited to this embodiment, and the design can be freely changed without departing from the gist of the present invention.

[0023]

Since the blower of the present invention has the above-mentioned structure, it has the following effects. That is, even if the cover members 7 and 8 forming the housing 6 are deformed due to molding strain, the internal space 9 of the housing 6 is maintained at a predetermined size. As a result, the resin material is used to reduce the thickness by reducing the wall thickness, and the impeller 1 and the rotation driving means 2 and 3 housed in the housing 6 can be arranged at high density. Therefore, the blower can be downsized.

Further, since the inside of the housing 6 is densely arranged, the loss of intake / exhaust of air can be reduced, so that the wind noise is reduced and the blower with low noise can be obtained. Since the columns 10 and 12 are in the air flow passage and have a streamlined shape corresponding to this air flow, they do not hinder the air flow, so that they do not cause noise and cause blower blower. Low noise can be realized.

[Brief description of drawings]

FIG. 1 is a plan view showing an entire blower according to the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is a side view of FIG.

FIG. 4 is another side view of FIG. 1.

5 is an overall sectional view taken along the line AA in FIG.

FIG. 6 (a) is a plan view of the blower of the present invention in a disassembled state, and FIG. 6 (b) is a side view thereof.

FIG. 7 (a) is a plan view of the blower of the present invention in a disassembled state, and FIG. 7 (b) is a side view thereof.

[Explanation of symbols]

 1 Impeller 2 Stator 3 Rotor Magnet 4 Suction Hole 5 Discharge Hole 6 Housing 7 Upper Lid (First Cover Member) 8 Lower Lid (Second Cover Member)

Claims (2)

[Claims] 1. A cross-flow impeller for discharging air in a radial direction with respect to a rotary shaft, a rotary drive means for rotationally driving the cross-flow impeller by a stator and a rotor magnet, and a housing for accommodating the cross-flow impeller and the rotary drive means. A housing provided with a suction hole and a discharge hole, and the air sucked from the suction hole of the housing is discharged to the outside by rotationally driving the cross-flow impeller. In the blower, the housing is formed of a resin material from a first cover member and a second cover member, and these are provided so as to face each other, and the first cover member and the second cover member are provided. A blower for maintaining an internal space defined by these in a predetermined manner between the and. 2. The blower according to claim 1, wherein the support column is formed in a streamline shape corresponding to the airflow in the airflow passage acted by the crossflow impeller.