JP2015124712A - Air blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air blower suppressing occurrence of vibration and noise with a structure hard to be broken.SOLUTION: An air blower includes: a motor 3 that has a drive shaft 4 and rotates the drive shaft 4; a drive transmission shaft 5 that is attached perpendicular to the axial direction of the drive shaft 4; a fan 2 that receives rotational force from the motor 3 through the drive shaft 4 and the drive transmission shaft 5 to rotate; a boss 2a that is provided in the central part of the fan 2 and into which the drive shaft 4 is inserted; and a slide prevention member that is attached to the drive shaft 4 and contacts with the inner surface of the boss 2a.

Description

  The present invention relates to a blower used for a ventilation fan, an air conditioner, and the like, and particularly relates to a mounting structure of a motor and a fan.

  A blower produces a wind by driving a motor and rotating a fan via a drive shaft. Conventional blowers are mainly composed of a motor that generates rotational force, a drive shaft having a drive transmission shaft that transmits rotational force to the fan, a fan that generates wind, and a knob that fixes the fan and the motor. (For example, refer to Patent Document 1).

  The conventional blower as described in Patent Document 1 causes repeated collisions in the rotational direction at the contact portion between the drive transmission shaft and the fan due to the cogging phenomenon of the motor during operation, resulting in increased vibration and abnormal noise. There was a problem that occurred. Therefore, when attaching the fan to the drive shaft, measures are taken against this problem by sandwiching an elastic washer between the drive transmission shaft and the U-shaped groove formed in the boss which is the contact portion of the drive transmission shaft. (See, for example, Patent Document 2).

Japanese Patent Laid-Open No. 62-10532 JP 2009-250114 A

  However, since the blower described in Patent Document 2 has a structure in which a washer is sandwiched between a drive transmission shaft and a U-shaped groove formed in a boss that is a contact portion of the drive transmission shaft, a twisting force is applied to the washer during operation. There was a problem of being easily damaged.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a blower that suppresses generation of vibration and abnormal noise by a configuration that is difficult to break.

  A blower according to the present invention includes a drive shaft, a motor that rotates the drive shaft, a drive transmission shaft that is mounted perpendicular to the axial direction of the drive shaft, and the drive shaft and the drive transmission shaft. The fan that receives the rotational force from the motor and rotates, the boss provided at the center of the fan, into which the drive shaft is inserted, and the slip prevention that is attached to the drive shaft and contacts the inner surface of the boss And a member.

  According to the blower according to the present invention, by attaching the anti-slip member to the drive shaft and bringing the anti-slip member into contact with the inner surface of the boss, a frictional force is generated between them, and the drive shaft and the boss are easily slipped. Therefore, it is possible to suppress the occurrence of vibration and abnormal noise with a configuration that is difficult to break.

It is an exploded view of the air blower concerning Embodiment 1 of the present invention. It is sectional drawing of the fan of FIG. It is the perspective view which showed the state before attaching a ring-shaped slip prevention member to the drive shaft of the air blower which concerns on Embodiment 1 of this invention. It is the perspective view which showed the state after attaching the ring-shaped slip prevention member to the drive shaft of the air blower which concerns on Embodiment 1 of this invention. It is the perspective view which showed the state before attaching two ring-shaped slip prevention members to the drive shaft of the air blower which concerns on Embodiment 2 of this invention. It is the perspective view which showed the state after attaching one ring-shaped slip prevention member to the drive shaft of the air blower which concerns on Embodiment 2 of this invention. It is the perspective view which showed the state after attaching two ring-shaped slip prevention members to the drive shaft of the air blower which concerns on Embodiment 2 of this invention. It is the perspective view which showed the state before attaching a cylindrical slip prevention member to the drive shaft of the air blower concerning Embodiment 3 of this invention. It is the perspective view which showed the state after attaching a cylindrical slip prevention member to the drive shaft of the air blower which concerns on Embodiment 3 of this invention. It is an expanded view of the cylindrical slip prevention member which concerns on Embodiment 3 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, in the following drawings, the relationship of the size of each component may be different from the actual one.
Embodiment 1 FIG.
1 is an exploded view of the blower 101 according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of the fan 2 of FIG.

Hereinafter, the structure of the blower 101 according to the first embodiment will be described.
As shown in FIG. 1, the blower 101 includes a knob 1, a fan 2, a motor 3, a drive shaft 4, a drive transmission shaft 5, and an anti-slip member 6.
The knob 1 is attached to the tip of the drive shaft 4 and fixes the fan 2 and the motor 3. The fan 2 rotates to generate wind, and is attached by inserting the drive shaft 4 into a boss 2a provided at the center thereof. In the first embodiment, the fan 2 is a propeller fan, but may be another fan such as a sirocco fan.

  The motor 3 is a power source for the blower 101, and rotates the drive shaft 4 attached to the central portion by electric power. The drive shaft 4 is attached to the central portion of the motor 3 and transmits the rotational force of the motor 3 to the fan 2 via the drive transmission shaft 5. The drive transmission shaft 5 is attached perpendicular to the axial direction of the drive shaft 4 and transmits the rotational force from the motor 3 to the fan 2. Therefore, when the fan 2 is attached to the drive shaft 4, the fan 2 is fitted into the U-shaped groove 2 a 1 formed in the boss 2 a.

The fan 2 is attached such that the boss 2a is inserted into the drive shaft 4 attached to the central portion of the motor 3, and the drive transmission shaft 5 is fitted into the U-shaped groove 2a1 of the boss 2a. And it fixes by attaching the knob 1 to the front-end | tip of the drive shaft 4 in the state.
The slip prevention member 6 will be described later.

Next, the operation of the blower 101 will be described.
When power is supplied to the blower 101, the motor 3 is driven to rotate the drive shaft 4, and the drive transmission shaft 5 is also rotated simultaneously. The rotational force is transmitted to the fan 2, and the fan 2 rotates to generate wind.

  However, in the blower 101, when a gap is generated between the drive shaft 4 and the inner surface of the boss 2a into which the drive shaft 4 is inserted, and the drive shaft 4 and the boss 2a are slippery, the cogging phenomenon of the motor 3 during operation, etc. As a result, repeated collisions occur in the rotational direction between the drive transmission shaft 5 and the boss 2a of the fan 2, resulting in increased vibration and abnormal noise.

  As a means for suppressing the occurrence of vibration and abnormal noise, the drive shaft 4 and the boss 2a into which the drive shaft 4 is inserted are increased by increasing the diameter of the drive shaft 4 or decreasing the inner diameter of the boss 2a. It is conceivable to eliminate the gap between the inner surface and harden the fit between them. However, if it does so, the operation | work at the time of attaching or detaching the fan 2 to the drive shaft 4 will become difficult.

FIG. 3 is a perspective view showing a state before the ring-shaped anti-slip member 6 is attached to the drive shaft 4 of the blower 101 according to the first embodiment of the present invention, and FIG. 4 shows the first embodiment of the present invention. It is the perspective view which showed the state after attaching the ring-shaped slip prevention member 6 to the drive shaft 4 of the air blower 101 which concerns.
In the first embodiment, as shown in FIGS. 3 and 4, the occurrence of vibration and abnormal noise is suppressed by attaching an anti-slip member 6 to the drive shaft 4.

The anti-slip member 6 is formed in a ring shape, and the material thereof is an elastomer, rubber, or resin, and is an elastic body.
Further, as shown in FIG. 3, the drive shaft 4 is formed with an annular shaft groove 4a (corresponding to the groove in the claims) along the circumferential direction. Therefore, by forming the inner diameter of the anti-slip member 6 smaller than the diameter of the drive shaft 4, the anti-slip member 6 is attached to the shaft groove 4a as shown in FIG. As described above, by attaching the anti-slip member 6 to the drive shaft 4, the anti-slip member 6 is caught in the shaft groove 4 a, and the anti-slip member 6 is not easily detached from the drive shaft 4.

  The material of the anti-slip member 6 is an elastomer, rubber, or resin, and has elasticity because it is an elastic body. Therefore, the anti-slip member 6 is driven by forming the inner diameter of the anti-slip member 6 smaller than the bottom diameter of the shaft groove 4a of the drive shaft 4 and extending the anti-slip member 6 to attach to the shaft groove 4a of the drive shaft 4. When attached to the shaft 4, the contraction force of the anti-slip member 6 is applied to the drive shaft 4, and the anti-slip member 6 can be made difficult to come off from the drive shaft 4.

  Note that the anti-slip member 6 is located on the drive shaft 4 from the upper side (the upper side in FIGS. 3 and 4 and the side on which the fan 2 is attached) and the lower side (the lower side in FIGS. 3 and 4 and the motor 3 is attached). However, since the diameter of the drive shaft 4 is smaller on the upper side than on the lower side, the drive shaft 4 is easier to attach on the upper side.

  In the drive shaft 4, the diameter of the portion where the anti-slip member 6 is attached, including the anti-slip member 6, is larger than the diameter of the portion where the anti-slip member 6 is not attached. When the is inserted, the anti-slip member 6 comes into contact with the inner surface of the boss 2a, and the gap between the drive shaft 4 and the inner surface of the boss 2a is filled.

  Thus, when the anti-slip | skid member 6 contacts the inner surface of the boss | hub 2a, a frictional force generate | occur | produces between them, and it can suppress that the drive shaft 4 and the boss | hub 2a become slippery. Here, since the material of the anti-slip member 6 is an elastomer, rubber, or resin, a large frictional force can be easily generated.

  As a result, due to the cogging phenomenon of the motor 3 during operation, repeated vibrations in the rotational direction occur between the drive transmission shaft 5 and the boss 2a of the fan 2 to increase vibration and suppress abnormal noise. Can do. Further, since the anti-slip member 6 is in contact with the inner surface of the boss 2a of the fan 2, the anti-slip member 6 is not easily damaged.

  The ring-shaped anti-slip member 6 has a circular or oval cross section so that the frictional force between the anti-slip member 6 and the drive shaft 4 at the time of attachment / detachment can be compared to, for example, a rectangular shape. Therefore, the slip prevention member 6 can be easily attached to and detached from the drive shaft 4.

  As described above, by attaching the ring-shaped anti-slip member 6 to the drive shaft 4 and bringing the anti-slip member 6 into contact with the inner surface of the boss 2a, a frictional force is generated between them, and the drive shaft 4 and the boss 2a. Therefore, it is possible to suppress the occurrence of vibration and abnormal noise with a configuration that is difficult to break.

Embodiment 2. FIG.
FIG. 5 is a perspective view showing a state before two ring-shaped anti-slip members 6 are attached to the drive shaft 4 of the blower according to Embodiment 2 of the present invention, and FIG. 6 is Embodiment 2 of the present invention. The perspective view which showed the state after attaching one ring-shaped anti-slip | skid member 6 to the drive shaft 4 of the air blower which concerns on FIG. 7, FIG. 7 is a ring shape in the drive shaft 4 of the air blower concerning Embodiment 2 of this invention. It is the perspective view which showed the state after attaching two slip prevention members 6 of this.
Hereinafter, although Embodiment 2 will be described, the same elements as those in Embodiment 1 are omitted, and the same or corresponding parts as those in Embodiment 1 are denoted by the same reference numerals.

  In the second embodiment, as shown in FIG. 5, the drive shaft 4 is formed with two annular shaft grooves 4a along the circumferential direction. The two shaft grooves 4 a are respectively formed above and below two holes opened at right angles to the axial direction of the drive shaft 4 inserted to attach the drive transmission shaft 5 to the drive shaft 4. Therefore, in order to attach the anti-slip member 6 from the upper side of the drive shaft 4, it is necessary to attach the anti-slip member 6 to the lower shaft groove 4a before attaching the drive transmission shaft 5 to the drive shaft 4 as shown in FIG. There is. After the anti-slip member 6 is attached to the lower shaft groove 4a of the drive shaft 4, another anti-slip member 6 is attached to the upper shaft groove 4a as shown in FIG. May be before or after being attached to the drive shaft 4.

  In the drive shaft 4, the diameter of the portion where the two anti-slip members 6 are attached, including the anti-slip member 6, is larger than the diameter of the portion where the anti-slip member 6 is not attached. When the boss 2a is inserted, both of the anti-slip members 6 come into contact with the inner surface of the boss 2a so that the gap between the drive shaft 4 and the inner surface of the boss 2a is filled. As described above, when the anti-slip member 6 contacts the inner surface of the boss 2a, a frictional force is generated between them. However, since the two anti-slip members 6 are used in the second embodiment, the anti-slip member is used. The frictional force can be increased as compared with the first embodiment using one 6.

  As described above, by attaching two ring-shaped anti-slip members 6 to the drive shaft 4 and bringing both of the anti-slip members 6 into contact with the inner surface of the boss 2a, the frictional force generated between them is implemented. Since the number can be increased as compared with the first embodiment, the effect of suppressing the occurrence of vibration and abnormal noise can be further enhanced as compared with the first embodiment.

  In the second embodiment, two ring-shaped anti-slip members 6 are used, but three or more may be used. However, although there is a merit that the friction force can be increased by increasing the number of the ring-shaped anti-slip members 6, it should be considered that there is a demerit that the attachment / detachment becomes troublesome and the cost is increased.

Embodiment 3 FIG.
FIG. 8 is a perspective view showing a state before the cylindrical slip prevention member 7 is attached to the drive shaft 4 of the blower according to Embodiment 3 of the present invention, and FIG. 9 is related to Embodiment 3 of the present invention. It is the perspective view which showed the state after attaching the cylindrical slip prevention member 7 to the drive shaft 4 of an air blower.
Hereinafter, although Embodiment 3 will be described, the same elements as those in Embodiment 1 are omitted, and the same or corresponding parts as those in Embodiment 1 are denoted by the same reference numerals.

  In the third embodiment, the anti-slip member 7 is formed in a cylindrical shape, and the material thereof is an elastomer, rubber, or resin, as in the first and second embodiments, and is an elastic body. The cylindrical anti-slip member 7 has two holes 7 a into which the drive transmission shaft 5 is inserted. The two holes 7 a are opened at right angles to the axial direction of the drive shaft 4. In accordance with the two holes, the drive transmission shaft 5 is inserted and attached to the hole 7a as shown in FIG.

By attaching the cylindrical anti-slip member 7 to the drive shaft 4 in this way, the anti-slip member 7 is caught on the drive transmission shaft 5, and the anti-slip member 7 is not easily detached from the drive shaft 4. Therefore, it is not necessary to form the shaft groove 4a in the drive shaft 4.
The anti-slip member 7 can be attached from the upper side or the lower side of the drive shaft 4. However, since the drive shaft 4 has a smaller diameter on the upper side than the lower side, it is attached from the upper side. Cheap.

  In the drive shaft 4, the diameter of the portion where the anti-slip member 7 is attached is larger than the diameter of the portion where the anti-slip member 7 is not attached, and slipping occurs when the boss 2 a of the fan 2 is inserted into the drive shaft 4. The prevention member 7 is in contact with the inner surface of the boss 2a so that the gap between the drive shaft 4 and the inner surface of the boss 2a is filled. Thus, when the anti-slip member 7 comes into contact with the inner surface of the boss 2a, it is possible to prevent frictional force between them and the drive shaft 4 and the boss 2a from slipping easily. As a result, due to the cogging phenomenon of the motor 3 during operation, repeated vibrations in the rotational direction occur between the drive transmission shaft 5 and the boss 2a of the fan 2 to increase vibration and suppress abnormal noise. Can do. Further, since the anti-slip member 7 is in contact with the inner surface of the boss 2a of the fan 2, the anti-slip member 7 is not easily damaged.

  As described above, the cylindrical anti-slip member 7 is attached to the drive shaft 4 and the anti-slip member 7 is brought into contact with the inner surface of the boss 2a, whereby a frictional force is generated between them, and the drive shaft 4 and the boss 2a. Therefore, it is possible to suppress the occurrence of vibration and abnormal noise with a configuration that is difficult to break.

FIG. 10 is a development view of the cylindrical anti-slip member 7 according to Embodiment 3 of the present invention.
In the third embodiment, the cylindrical anti-slip member 7 is formed into a cylindrical shape from the beginning as shown in FIGS. 8 and 9, but is formed into a plate shape as shown in FIG. It is also possible to use a rounded cylinder.

  1 knob, 2 fan, 2a boss, 2a1 U-shaped groove, 3 motor, 4 drive shaft, 4a shaft groove, 5 drive transmission shaft, 6 (ring-shaped) anti-slip member, 7 (tubular) anti-slip member, 7a hole (in the cylindrical anti-slip member), 101 blower.

Claims (9)

A motor having a drive shaft and rotating the drive shaft;
A drive transmission shaft mounted perpendicular to the axial direction of the drive shaft;
A fan that receives and rotates from the motor via the drive shaft and the drive transmission shaft;
A boss provided in a central portion of the fan and into which the drive shaft is inserted;
A blower comprising: an anti-slip member attached to the drive shaft and in contact with an inner surface of the boss. The blower according to claim 1, wherein the anti-slip member is an elastic body. The blower according to claim 1 or 2, wherein the anti-slip member has a ring shape. The blower according to claim 3, wherein the anti-slip member has a circular or elliptical cross section. The drive shaft has an annular groove along the circumferential direction;
The inner diameter of the anti-slip member is smaller than the diameter of the drive shaft,
The blower according to any one of claims 2 to 4, wherein the anti-slip member is attached to a groove of the drive shaft. The blower according to claim 5, wherein an inner diameter of the anti-slip member is smaller than a bottom diameter of the groove of the drive shaft. The blower according to claim 1, wherein the anti-slip member has a cylindrical shape. The anti-slip member has at least two holes;
The blower according to claim 7, wherein the drive transmission shaft is inserted into the two holes. The blower according to claim 7 or 8, wherein the anti-slip member is rounded to form the cylinder.

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