JP6803520B2 - Detachable device and blower equipped with this - Google Patents

Description

The present invention relates to a detachable device for detachably holding a rotating shaft of a motor and an impeller, and a blower provided with the detachable device.

Conventionally, the attachment / detachment device, which is a member for fixing the blades to the rotation shaft of the motor, can be removed by pinching the two opposing pressing portions with, for example, a fingertip and pressing them in the rotation axis direction. Specifically, the holding portion that holds the rotating shaft is displaced by pressing in a direction away from the rotating shaft, and the holding is released by this displacement, and the blades and the like attached to the rotating shaft can be attached and detached (for example, patented). Reference 1).

Hereinafter, the ventilation device will be described with reference to FIG.

In the conventional attachment / detachment device 101 shown in FIG. 6, by pressing the two pressing portions 102 in the direction of approaching the rotating shaft 103, the holding portion 104 is displaced in the direction of detaching from the rotating shaft 103, so that the pinching is released. Can be done.

Japanese Unexamined Patent Publication No. 2004-124782

In such a conventional attachment / detachment device 101, when a force is applied to the attachment / detachment device 101 in the direction of pulling out from the rotation shaft 103, that is, in the pulling direction 112 while the holding portion 104 sandwiches the rotating shaft 103, the holding portion 104 Is pulled by the rotating shaft 103, so that a force is applied in the shaft pulling direction 105 (downward in FIG. 6) opposite to the pulling direction 112.

When the material of the attachment / detachment device 101 is made of, for example, a synthetic resin which is easily affected by bending, the force in the pulling direction affects the holding portion 104. Therefore, when the applied force is large, the pressing portion 102 is pressed. There was a possibility that the pinch would be released without pressing.

Therefore, the present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a detachable device 101 capable of holding a pinch even when a large force is applied in the pulling direction.

Then, in order to achieve this object, the attachment / detachment device according to the present invention is an attachment / detachment device that detachably holds the rotation shaft of the motor and the impeller, and the rotation through which the rotation shaft penetrates on the impeller. A pedestal portion arranged around the center, two foundation portions provided on the pedestal portion at positions facing each other with the rotation center as the center, and a direction in which the rotation axis penetrates from the two foundation portions. The rotation axis is opposed to the rotation axis on a virtual plane provided orthogonal to the rotation axis including two ends of the support portion extending to the above and opposite to the pedestal portion of the support portion. The pinching portion to be sandwiched from both side surfaces and the outer peripheral side of the sandwiching portion on the virtual plane are provided in parallel with the both side surfaces, and the rotation by the sandwiching portion is performed by pressing from the outer peripheral side in the rotation axis direction. It is provided with two pressing portions for releasing the pinching of the shaft, and the foundation portion straight line connecting the two foundation portions is provided perpendicular to the pressing portion straight line connecting the two pressing portions. It achieves the intended purpose.

According to the present invention, it is possible to provide an attachment / detachment device capable of holding a pinch even when a large force is applied in the pulling direction.

Cross-sectional view of the ventilation fan according to the present invention Side sectional view of the attachment / detachment device according to the present invention Perspective view of the attachment / detachment device according to the present invention Side view of the attachment / detachment device according to the present invention Schematic diagram of the conventional and detachable devices according to the present invention Sectional view of a conventional ventilation fan

The attachment / detachment device according to the present invention is an attachment / detachment device that detachably holds the rotation shaft of the motor and the impeller, and is a pedestal arranged around the rotation center through which the rotation shaft penetrates on the impeller. A portion, two foundation portions provided at positions facing each other about the center of rotation on the pedestal portion, a strut portion extending in a direction in which the rotation axis penetrates from the two foundation portions, and the strut portion. On a virtual plane provided perpendicular to the rotation axis including two ends opposite to the pedestal portion, the rotation axis is sandwiched from both opposite side surfaces of the rotation axis, and on the virtual plane. It is provided with two pressing portions which are provided in parallel with both side surfaces on the outer peripheral side of the holding portion in the above and release the holding of the rotating shaft by the sandwiching portion by pressing from the outer peripheral side in the direction of the rotation axis. The foundation portion straight line connecting the two foundation portions is provided perpendicular to the pressing portion straight line connecting the two pressing portions.

When a force is applied in a direction in which the holding portion is released from the rotating shaft while the pressing portion is not pressed, that is, when the holding portion sandwiches the rotating shaft, the force is transmitted to the strut portion via the holding portion. However, the straight line of the base including the two strut parts is perpendicular to the straight line of the pressing part. Therefore, since the transmitted force is applied perpendicularly to the release direction of the pressing portion, the pressing portion does not come close to the rotation axis. In other words, the force is applied in the direction in which the strut portion is close to the rotation axis, but the pressing portion is not displaced in the rotation axis direction but is displaced in the direction perpendicular to the direction approaching the rotation axis, so that the pinch is not released. That is, when the pressing portion is pressed in a direction approaching the rotation axis, the pinching is released, but even if a large force is applied in the direction in which the impeller or the like attached to the attachment / detachment device is removed without pressing the pressing portion, the blades. It is possible to prevent the car from coming off.

Further, it may be configured to include a first distortion suppressing portion that suppresses distortion of the sandwiching portion in the linear direction of the base portion.

As a result, when a force parallel to the rotating shaft from the holding portion to the pedestal portion is applied to the rotating shaft while the rotating shaft is sandwiched, a force in the same direction is also applied to the sandwiching portion holding the rotating shaft. Join. As a result, a force acts on the strut portion in the direction approaching the rotation axis. However, since the first distortion suppressing portion is displaced in the direction approaching the rotation shaft, the first distortion suppressing portion comes into contact with the rotation shaft when a large force is applied. Therefore, the displacement of the support column portion in the direction close to the rotation axis is suppressed, and the effect of preventing the attachment / detachment device from coming off is achieved.

Further, it may be configured to include a second distortion suppressing portion that suppresses distortion of the sandwiching portion in the direction of the pedestal portion.

As a result, when a force parallel to the rotating shaft from the holding portion to the pedestal portion is applied to the rotating shaft while the rotating shaft is sandwiched, a force in the same direction is also applied to the sandwiching portion holding the rotating shaft. Join. As a result, a force acts on the support column in a direction close to the rotation axis. Then, the holding portion is displaced in the direction of the pedestal portion as the rotation shaft moves in the minute pull-out direction. However, since the sandwiching portion comes into contact with the second distortion suppressing portion, further displacement is suppressed, and the effect of preventing the attachment / detachment device from coming off is achieved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are examples that embody the present invention, and do not limit the technical scope of the present invention.

(Embodiment 1)
As shown in FIG. 1, the attachment / detachment device 1 according to the present embodiment is used for a blower such as a ventilation fan 2.

The ventilation fan 2 includes an impeller 5, a motor 3, and a detachable device 1.

The impeller 5 has a cylindrical shape with a motor 3 arranged on the top surface side, and has an opening on the bottom surface side for guiding air inside the cylindrical shape. The impeller 5 is provided with a plurality of fins on the side surface. The impeller 5 has a rotation center connecting the center of the top surface and the center of the bottom surface, and by rotating around the rotation center, air is sucked into the cylindrical shape from the opening and sucked into the cylindrical shape. Blow out air from the side. The impeller 5 corresponds to, for example, a sirocco fan. The impeller 5 is provided with a fitting portion 6 for fixing the attachment / detachment device 1 on the center of rotation.

As shown in FIG. 2, the fitting portion 6 includes a fitting portion 6a provided on the impeller 5 side and a fitting portion 6b provided on the attachment / detachment device 1 side.

The fitting portion 6a is, for example, a plurality of holes provided around the rotation center of the impeller 5.

The fitting portion 6b is, for example, a plurality of claws that protrude from the attachment / detachment device 1 in the direction of the impeller 5 and are provided corresponding to the holes that are the fitting portions 6a. By fitting the plurality of claws of the fitting portion 6b into the plurality of holes of the fitting portion 6a, the attachment / detachment device 1 can be fixed on the rotation center of the impeller 5.

The motor 3 includes a rotating shaft 4, and an impeller 5 is fixed to the rotating shaft 4 via a detachable device 1. The motor 3 rotates the rotating shaft 4 by feeding power, so that the impeller 5 generates an air flow.

The attachment / detachment device 1 is fixed to the impeller 5 and is detachably held with respect to the rotating shaft 4, so that the impeller 5 can be removed from the rotating shaft 4. The detailed configuration of the attachment / detachment device 1 will be described separately.

Subsequently, the details of the attachment / detachment device 1 will be described with reference to FIGS. 3 and 4.

As shown in FIGS. 3 and 4, the attachment / detachment device 1 includes a pedestal portion 7, a base portion 8, a support portion 9, a holding portion 10, and a pressing portion 11.

The pedestal portion 7 has a cylindrical shape and includes the above-mentioned fitting portion 6b protruding from the bottom surface in the impeller 5 direction. The pedestal portion 7 is provided with a through hole 21 penetrating the top surface and the bottom surface.

The through hole 21 is a hole for the rotation shaft 4 located at the center of rotation to penetrate from the bottom surface toward the top surface. In other words, the pedestal portion 7 is arranged so as to surround the circumference of the center of rotation.

The base portion 8 is a target, that is, two positions (places) provided at opposite positions with the center of rotation as the center. The base portion 8 is provided on the top surface side of the pedestal portion 7 at a position in contact with the outer circumference of the pedestal portion 7. A predetermined distance is provided between the two base portions 8, and a second distortion suppressing portion 13 is provided between the two base portions 8, which will be described in detail later. The base portion straight line 22, which is a straight line connecting the two foundation portions 8, passes through the through hole 21 and divides the attachment / detachment device 1 into two in a top view. The top view means the viewpoint position of the pedestal portion 7 of the attachment / detachment device 1 looking into the top surface.

The strut portion 9 extends from the two base portions 8 in the direction in which the rotation shaft penetrates, that is, in the direction away from the pedestal portion 7 starting from the top surface of the pedestal portion 7. A space is provided between the two strut portions 9. A virtual plane 20 is provided at an end of the support column 9 opposite to the pedestal portion 7.

The virtual plane 20 is a plane provided perpendicular to the rotation axis 4 including two ends of the support column 9 opposite to the pedestal portion 7. Further, the virtual plane 20 may be a plane provided parallel to the top surface of the pedestal portion 7, in other words, the pedestal portion 7. The virtual plane 20 is a temporary plane provided for explaining the configuration of each part.

The sandwiching portion 10 extends in the direction of the center of rotation, in other words, in the direction of the rotating shaft 4, from the end or the vicinity of the end opposite to the pedestal portion 7 in the strut portion 9. When the holding portion 10 is extended linearly, it collides with the rotating shaft 4. Therefore, the tip portion of the holding portion 10 in the extending direction bypasses the rotating shaft 4 sideways, and both sides of the rotating shaft 4 facing each other. The rotation shaft 4 is sandwiched from the surface. The tip portion provided so as to bypass functions as the first distortion suppressing portion 12, but the details will be described later. Here, the opposing side surfaces of the rotating shaft 4 are side surfaces parallel to the direction in which the sandwiching portion 10 is extended. The rotating shaft 4 has a cylindrical shape and its side surface is a curved surface, but at one point on the side surface, it is expressed as both side surfaces as forming a surface. In other words, it can be said that the tangent line at one point shown as the side surface and the extending direction of the holding portion 10 are parallel. The two sandwiching portions 10 are provided on the virtual plane 20, that is, the rotating shaft 4 is sandwiched from both side surfaces on the virtual plane 20.

The pressing portion 11 is provided at the tip of the extension foundation 11a extending in an arc shape along the outer circumference of the pedestal portion 7 from the end portion or the vicinity of the end portion of the support column portion 9 opposite to the pedestal portion 7. The starting point in the circumferential direction of the extension foundation 11a coincides with the starting point of the strut portion 9 of the holding portion 10. That is, the starting point of the extension foundation 11a at the support column 9 coincides with the starting point of the holding portion 10 at the support column 9. The pressing portion 11 is arranged at a position where the angle between the strut portion 9 and the pressing portion 11 via the rotation center is 90 degrees due to the extension of the extension foundation 11a. The reference of the position of the pressing portion 11 is the center position on the plane forming the pressing portion 11. The two extension foundations 11a extend from the two support columns 9 in the same circumferential direction, so that the two pressing portions 11 are arranged at positions facing each other with the rotation center interposed therebetween. That is, the pressing portion 11 is provided on the virtual plane 20 on the outer peripheral side of the holding portion 10, and the plane of the pressing portion 11 is provided parallel to the above-mentioned both side surfaces. The pressing portion 11 and the holding portion 10 connected to one strut portion 9 are arranged so as to sandwich the center of rotation. The pressing portion straight line 23, which is a straight line connecting the two pressing portions 11, passes through the through hole 21 and divides the attachment / detachment device 1 into two in a top view. Further, the base straight line 22 and the pressing straight line 23 intersect vertically on the center of rotation in a top view.

Subsequently, the difference between the conventional structure and the attachment / detachment device 1 according to the present invention will be described with reference to FIGS. 5 and 6.

In the conventional structure, as shown in FIG. 5A, the pressing portion 102 and the holding portion 104 are arranged so as to sandwich the rotation shaft 103. Therefore, when the pressing portion 102 is pinched with a finger or the like and pressed in the rotation axis direction 112, The holding portion 104 is displaced in the direction 113 away from the rotating shaft 103, and the attachment / detachment device 101 can be pulled out from the rotating shaft 103.

On the other hand, when the attachment / detachment device 101 is to be pulled out from the rotating shaft 103 without pressing the pressing portion 102, the rotating shaft 103 is displaced in the shaft pulling direction 105 of FIG. At this time, since the holding portion 104 and the rotating shaft 103 are in contact with each other, the holding portion 104 also tries to be displaced in the shaft pulling direction 105. However, in reality, since the attachment / detachment device 101 is formed of a synthetic resin or the like so that the pressing portion 102 can be bent, the holding portion 104 is pulled in the direction in which the base portion 107 is easily bent, that is, in the direction 110 away from the rotation shaft 103. Be done. Since the holding portion 104 and the pressing portion 102 are integrated, the pressing portion 102 is affected by the displacement of the holding portion 104. Here, in the conventional structure, the pressing portion straight line 106 formed by connecting the pressing portions 102 and the foundation portion straight line 108 formed by connecting the foundation portions 107 are configured in parallel. As a result, when the holding portion 104 is displaced in the shaft pulling direction 105, the pressing portion 102 is directly pulled by the change in the holding portion 104 and is displaced in the pressing direction 111, that is, in the rotation shaft 103 direction and in the pedestal portion direction. .. As a result, the holding portion 104 is displaced in the direction away from the rotating shaft 103, that is, in the direction in which the holding portion 102 is released, and the attachment / detachment device 101 can be easily pulled out from the rotating shaft 103 without pressing the pressing portion 102. In some cases.

On the other hand, in FIG. 5B, which is the configuration of the present invention, when the pressing portion 11 is pressed from the outer peripheral side in the direction 30 approaching the rotation shaft 4, the strut portion 9 connected to the pressing portion 11 is pressed. It tilts in the pressed direction 31. Since the pair of pressing portions 11 and the holding portion 10 are arranged so as to sandwich the center of rotation, when the supporting portion 9 is tilted in the pressed direction 31, the holding portion 10 connected to the supporting portion 9 rotates. It is displaced in the direction 32 away from the shaft 4. That is, by pinching the two opposing pressing portions 11 with, for example, a fingertip and pressing them in the direction of the rotation shaft 4, the sandwiching portion 10 is displaced in the direction away from the rotation axis, and this displacement releases the pinching of the rotation shaft 4. The blades and the like attached to the rotating shaft can be attached and detached. In other words, by pressing the two pressing portions 11, each pressing portion 11 is displaced in the direction of approaching the rotating shaft 4, and the holding portion 10 is displaced in the direction of detaching from the rotating shaft 4. Therefore, from the attachment / detachment device 1. The rotating shaft 4 can be pulled out.

On the other hand, if a force is applied in a direction parallel to the rotation axis 4 from the holding portion 10 toward the pedestal portion 7, that is, in a direction in which the rotation shaft 4 comes out without pressing the pressing portion 11, the holding portion 10 moves from the holding portion 10 to the pedestal. A force is applied in a direction parallel to the rotation axis 4 toward the portion 7. In other words, the holding portion 10 is displaced by applying a force in the direction of the rotation axis 4 and the pedestal portion 7 direction (similar to the direction 110 in FIG. 6). At this time, since the strut portion 9 is integrated with the sandwiching portion 10, it is affected by the displacement of the sandwiching portion 10.

Specifically, when the rotating shaft 4 is pulled out, a force 33 that tilts toward the pedestal portion 7 and a force 34 that separates from the rotating shaft 4 act on the holding portion 10. Here, the base portion straight line 22 including the two strut portions 9 is perpendicular to the pressing portion straight line 23, and the pressing portion 11 is provided on the outer peripheral side of the holding portion 10 and parallel to both side surfaces. Therefore, the force 33 that tilts the holding portion 10 in the direction of approaching the pedestal portion 7 acts on the support portion 9 in the direction 35 of approaching the pedestal portion 7 and the rotation shaft 4. As a result, the strut portion 9 and the pressing portion 11 are displaced in the direction 35 perpendicular to the direction in which the pinching is released, so that the holding is not released.

Further, the force 34 acting in the direction in which the holding portion 10 moves away from the rotation shaft 4 is absorbed by the holding portion 10 itself extending from the support portion 9, and therefore does not affect or gives the pressing portion 11. Even so, it is smaller than the conventional structure.

Therefore, when a force is applied in the direction in which the impeller 5 attached to the attachment / detachment device 1 is removed without pressing the pressing portion 11, that is, the impeller 5 rotates due to the weight of the impeller 5 or vibration during operation. Even if a force is applied in the direction of coming off the shaft 4, it is possible to prevent the impeller 5 from coming off.

It should be noted that the configuration may include the above-mentioned first distortion suppressing unit 12. Specifically, the first distortion suppressing portion 12 provided as the tip portion of the holding portion 10 in the extending direction comes into contact with the rotating shaft 4 when the strut portion 9 is displaced in the direction 35 toward the rotation center. This regulates the displacement of the strut portion 9 in the direction of the center of rotation. As a result, the first distortion suppressing portion 12 suppresses distortion of the holding portion 10 in the direction of the straight line 22 of the base portion and in the direction of the center of rotation of the strut portion 9.

That is, when a force 33 approaching the pedestal portion 7 is applied to the strut portion 9, the first distortion suppressing portion 12 approaches the rotating shaft 4 because the force 33 is simultaneously displaced in the direction 35 approaching the rotating shaft 4. Displace in the direction. At this time, since the sandwiching portion 10 comes into contact with the tip portion of the first distortion suppressing portion 12, when a large force is applied and the predetermined displacement amount is exceeded, the first distortion suppressing portion 12 and the rotating shaft 4 come into contact with each other. Therefore, further displacement of the holding portion 10 can be suppressed. Therefore, even if a force is applied in the direction in which the impeller 5 comes off due to the weight of the impeller 5 or vibration during operation, it is possible to further suppress the impeller 5 from coming off. That is, even when a force is applied in the direction in which the impeller 5 is removed, the displacement of the support column 9 is regulated. Therefore, as a result, the deformation of the holding portion 10 is suppressed, and it is possible to prevent the impeller 5 from coming off without operating the pressing portion 11.

Further, the pedestal portion 7 may be provided with the second distortion suppressing portion 13 protruding from the pedestal portion 7 in the holding portion 10 direction so as to surround the rotation shaft 4, that is, the through hole 21. The tip of the second distortion suppressing portion 13 protruding from the pedestal portion 7 extends to a position close to the holding portion 10. As a result, when a force 33 is applied to the holding portion 10, the second distortion suppressing portion 13 comes into contact with the tip portion of the second distortion suppressing portion 13, so that the pedestal portion of the holding portion 10 Distortion in 7 directions can be suppressed.

That is, when a force is applied in the direction in which the impeller 5 is removed and the displacement of the holding portion 10 in the pedestal portion 7 direction exceeds a predetermined displacement amount, the holding portion 10 is moved to the tip portion of the second distortion suppressing portion 13. Since the contact is made, further displacement of the holding portion can be suppressed. Therefore, even if a force is applied in the direction in which the impeller 5 comes off due to the weight of the impeller 5 or vibration during operation, it is possible to further suppress the impeller 5 from coming off.

Since the attachment / detachment device 1 according to the present invention can be used for a rotating object that needs to be removed for maintenance such as cleaning, it can also be used for a cooling fan of a computer or the like where dust tends to collect.

1,101 Detachable device 2 Ventilation fan 3 Motor 4,103 Rotating shaft 5 Impeller 6,6a, 6b Fitting part 7 Pedestal part 8,107 Foundation part 9 Strut part 10 Holding part 11,102 Pressing part 11a Extended foundation 12th One distortion suppression part 13 Second distortion suppression part 20 Virtual plane 21 Through hole 22,108 Base part straight line 23,106 Pressing part straight line 104 Holding part

Claims (2)

A detachable device that detachably holds the rotating shaft of the motor and the impeller.
A pedestal portion arranged around the rotation center through which the rotation shaft penetrates on the impeller, and two foundation portions provided on the pedestal portion at positions facing each other with the rotation center as the center.
A strut portion extending in a direction through which the rotation axis penetrates from the two foundation portions,
A holding portion that sandwiches the rotating shaft from both opposite side surfaces of the rotating shaft on a virtual plane provided orthogonal to the rotating shaft, including two ends of the strut portion opposite to the pedestal portion. ,
Two pressing portions provided parallel to both side surfaces on the outer peripheral side of the sandwiching portion on the virtual plane and pressing from the outer peripheral side in the rotation axis direction to release the pinching of the rotating shaft by the sandwiching portion. And with
The base portion straight line connecting the two base portions is a attachment / detachment device provided perpendicular to the pressing portion straight line connecting the two pressing portions. A blower provided with the attachment / detachment device according to claim 1 .