JP5092853B2 - Blower blade mounting device - Google Patents

Description

  The present invention relates to a blade mounting device for a blower used for a ventilation fan, a small air conditioner, or the like.

  Conventionally, in this type of blower, the blades are directly attached to the shaft of the electric transmitter, and are fixed in a non-rotating state and a retaining state (see, for example, Patent Document 1).

  Hereinafter, the blade mounting device for the blower will be described with reference to FIG.

As shown in the figure, the blade 101 has a boss portion 102 at the center, a plurality of blades 103 are provided on the outer periphery thereof, and a shaft 104 of the motor (only the shaft is shown) is inserted into the axial center portion of the boss portion 102. Shaft hole 105 and a groove in a direction perpendicular to the shaft hole 105 are formed, and an engagement groove 107 with which the roll pin 106 inserted into the shaft 104 is engaged is formed to configure the blade 101 in a non-rotating state. Further, after inserting the shaft 104 into the shaft hole 105 of the boss portion 104, the spinner 108 is rotated and fixed to the tip side of the boss portion 102 (the fixing mechanism is not shown) so that the blade 101 is removed. It was configured to stop.
Japanese Patent Application Laid-Open No. Sho 62-10532 (Page 2, FIGS. 1 and 2)

  By the way, a small induction motor is usually used as an electric motor that rotates a blade with a blower used for a ventilation fan or a small air conditioner, and a DC motor is used for controlling the air volume with high accuracy. ing. When a smaller fan is required, the induction motor uses a half pitch type in which the stator winding is wound at half the pitch with respect to the magnetic pole of the stator core. Often doing.

  Therefore, in the conventional fan blade mounting device, when a half-pitch induction motor or a DC motor is used as the motor, torque unevenness due to the cogging phenomenon is repeatedly generated from the motor, whereas the blade 101 is a ventilation fan for pipes. This is not a problem with lighter blades such as blades, but with a certain amount of weight, it tries to rotate at a constant speed due to the inertial force, so there is a collision in the rotational direction at the engaging portion between the blade 101 and the roll pin 106. There has been a problem that vibrations and noise may occur repeatedly.

  The present invention solves such a conventional problem. A roll pin is inserted into a shaft of an electric motor, and a groove that engages with the roll pin is provided in a boss portion of the blade. An object of the present invention is to provide a blade mounting device for a blower that does not generate vibration or noise depending on the type of electric motor in the blower configured as a stop.

  In order to achieve the above object, the fan blade mounting device of the present invention is provided with a roll pin inserted and attached at right angles to the axis of the motor shaft, and a boss into which the shaft is inserted. A U-shaped groove that engages with the roll pin in a substantially U shape that opens to the shaft insertion side end surface, and the inner dimension of the U-shaped groove is slightly larger than the diameter of the roll pin. A large washer is fitted on the shaft, and is inserted between the U-shaped groove and the roll pin when inserted into the boss.

  Another means is that the material of the washer is an elastomer.

  Another means is that the washer is made of acrylonitrile butadiene rubber.

  Another means is that the washer is made of chloroprene rubber.

  In another means, the thickness of the washer is made larger than the gap formed between the roll pin and the U-shaped groove.

  Another means is that the washer fitting portion in contact with the roll pin insertion portion of the shaft is provided with an annular fitting groove, and the inner diameter of the washer is smaller than the bottom diameter of the fitting groove.

  Another means is that the U-shaped groove formed in the boss part is formed so that the bottom side of the groove is formed in a substantially U shape and the opening side of the groove is expanded in a substantially V shape. It is.

  Further, the other means is provided with a locking means for locking to the tip end portion of the shaft and holding the boss portion in a retaining state.

  According to the present invention, a U-shaped groove that engages with a roll pin inserted into a shaft of an electric motor is formed in a substantially U shape that is opened on a shaft insertion side end face of a boss portion of a blade, and an inner dimension of the U-shaped groove. Is formed slightly larger than the diameter of the roll pin, and the shaft is provided with an elastic washer that is sandwiched between the U-shaped groove and the roll pin when inserted into the boss portion. The effect of suppressing vibration and noise generation due to repeated collisions with the U-shaped groove of the boss part, and the suppression of this vibration and noise generation can be achieved by adding inexpensive parts such as washers. It is possible to provide a blade mounting device for a blower with a gap.

  In addition, by using an elastomer as the material of the washer, the end material at the time of manufacturing the washer can be reused, waste of the raw material can be eliminated, and suppression of vibration and noise generation can be achieved at a lower cost.

  In addition, by using acrylonitrile butadiene rubber or chloroprene rubber as the material of the washer, the heat resistance of the washer is improved and the oil is resistant, so that stable quality can be maintained.

  In addition, since the thickness of the washer is made larger than the gap formed between the roll pin and the U-shaped groove, the generation of vibration and noise can be further suppressed.

  In addition, the washer fitting portion that contacts the roll pin insertion portion of the shaft has an annular fitting groove, and the washer has an inner diameter smaller than the bottom diameter of the fitting groove, so that the washer can be used when cleaning the blades, etc. It can be prevented from being lost.

  Further, the U-shaped groove formed in the boss portion is formed so that the bottom side of the groove is formed in a substantially U shape, and the opening side of the groove is formed in a substantially V shape. It becomes easy to attach to the camera and can be attached in a stable state.

  In addition, by providing locking means that locks to the tip of the shaft and holds the boss in a retaining state, the washer is not excessively tightened, and the quality of the washer can be maintained for a long period of time.

  According to a first aspect of the present invention, there is provided a blade mounting device for a blower having a substantially U-shape opening at a shaft insertion side end surface of a boss portion of a blade, and a U-shaped groove with which a roll pin inserted into a shaft of an electric motor is engaged. The inner dimension of the U-shaped groove is slightly larger than the diameter of the roll pin, and the shaft is elastically sandwiched between the U-shaped groove and the roll pin when inserted into the boss portion. A body washer is fitted, and has the effect of mitigating repeated collisions between the roll pin and the U-shaped groove with the elastic body washer during operation of the electric motor.

  The blade mounting device for a blower according to claim 2 uses an elastomer as the material of the washer. By using a thermoplastic material for the washer, the end material generated at the time of manufacturing the washer can be reused. .

  Further, in the fan blade mounting device according to the third aspect, the material of the washer is acrylonitrile butadiene rubber, and the physical property change due to the temperature rise of the electric motor can be reduced.

  In addition, the blade mounting device for a blower according to claim 4 is made of chloroprene rubber as the material of the washer, and, similarly to the blade mounting device for a blower according to claim 3, changes in physical properties due to temperature rise of the motor are reduced. can do.

  Further, in the fan attachment device for a blower according to claim 5, the thickness dimension of the washer is made larger than a gap formed between the roll pin and the U-shaped groove, and the blade is located between the roll pin and the attachment. It will be in the state where preload was applied to

  According to a sixth aspect of the present invention, the blade mounting device for a blower includes an annular fitting groove in a washer fitting portion that is in contact with a roll pin insertion portion of a shaft, and the inner diameter of the washer is smaller than the bottom diameter of the fitting groove. The washer will not fall out.

  Further, in the fan attachment device for a blower according to claim 7, the U-shaped groove formed in the boss portion is formed in a substantially U shape on the bottom side of the groove, and the opening side of the groove is formed in a substantially V shape. When the blade is attached to the shaft, the roll pin is guided through the V-shaped opening of the U-shaped groove and easily enters the roll pin, and the roll pin reaching the bottom side of the U-shaped groove is approximately It will be held in a stable state in the U-shaped groove.

  The blade mounting device for a blower according to claim 8 is provided with locking means for locking to the tip of the shaft and holding the boss portion in a retaining state. Compared to a spinner or nut that is fastened to the fixed portion of the shaft, the washer is not tightened excessively.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment 1)
FIG. 1 is a perspective view showing an electric motor 1 and blades 2 constituting a blower. A shaft 3 of the electric motor 1 has a roll pin 4 inserted at a right angle with respect to an axial center, and a tip end portion is narrowed forward. And an annular locking groove 5 is formed in the vicinity of the tip. The blade 2 is a sirocco fan in which a plurality of blades 2a are erected on an outer peripheral portion, and a boss portion 6 into which a shaft 3 is inserted is provided at a central portion. The boss portion 6 is formed with a U-shaped groove 7 which is substantially U-shaped and is opened on the end surface on the side where the shaft 3 is inserted, and into which the roll pin 4 is engaged.

  The inner dimension of the U-shaped groove 7 of the boss 6 is formed to be slightly larger than the diameter of the roll pin 4, while the shaft 3 is attached with a washer 8 made of an elastic body at a position where it abuts against the roll pin 4 and stops. ing. Also, the thickness dimension A of the washer 8 shown in FIG. 2 is larger than the gap B between the roll pin 4 and the U-shaped groove 7 formed when the shaft 3 is inserted into the boss portion 6. Furthermore, the material of the washer 8 is an elastic body made of an elastomer.

  The attachment of the blade 2 configured as described above to the shaft 3 of the electric motor 1 will be described below.

  The blade 2 is attached by inserting the shaft 3 into the boss portion 6 and pressing it against the electric motor 1. However, since the tip portion of the shaft 3 becomes narrower toward the front, the shaft 3 can be easily inserted. When the roll pin 4 reaches a position where the roll pin 4 engages with the U-shaped groove 7, the washer 8 fitted to the shaft has a thickness dimension A larger than the gap B between the roll pin 4 and the U-shaped groove 7. In the pressure-bonded state, it is sandwiched between the roll pin 4 and the U-shaped groove 7. Then, the washer 8 is sandwiched and the roll pin 4 and the U-shaped groove 7 are engaged with each other. The bifurcated locking is provided in the locking groove 5 of the shaft 3 protruding from the side opposite to the U-shaped groove 7 of the boss 6. The clip 9 is locked to hold the blade 2 on the shaft 3.

  In this way, the blade 2 is held in the non-rotating state by the roll pin 4 and the U-shaped groove 7, and the blade 2 is held in the retaining state by the locking means including the locking groove 5 and the locking clip 9. Yes.

  The blade 2 attached as described above is a sirocco fan and has a certain weight. When the blade 2 is rotated by the electric motor 1, the inertial force causes an action to rotate at a constant speed. On the other hand, when the electric motor 1 is a half-pitch induction motor or a DC motor, torque unevenness due to the cogging phenomenon occurs repeatedly instead of a uniform rotational force. For this reason, the rotational motions of the roll pin 4 and the U-shaped groove 7 do not coincide with each other, and repeated collisions occur repeatedly between the roll pin 4 and the U-shaped groove 7. Depending on the strength of the collision, vibration and noise may be generated from the blade 2. Although an elastic washer 8 is sandwiched between the roll pin 4 and the U-shaped groove 7, the collision is mitigated by the washer 8, and the generation of vibration and noise is suppressed. be able to. Further, the washer 8 has a thickness dimension larger than the gap B between the roll pin 4 and the U-shaped groove 7 and is sandwiched in a pressure-bonded state, so that the blade 2 is in a state where a preload is applied to the roll pin 4. It is attached and the generation of vibration and noise can be further suppressed. Further, since the washer 8 is made of a thermoplastic elastomer, it is possible to reuse the end material generated during production, and to add an inexpensive component called the washer 8 to suppress vibration and noise. It can be further increased.

  Further, the blade 2 is prevented from coming off by being configured so that the boss portion 6 does not come off from the shaft 3 by the locking means for locking the locking clip 9 in the locking groove 5 in the vicinity of the tip portion of the shaft 3. Therefore, compared to a spinner or nut that fastens the boss portion to the fixed portion of the shaft by screwing, the washer 8 is not excessively tightened, and the quality of the washer 8 can be maintained for a long time.

  In the first embodiment, the blade 2 is a sirocco fan. However, a propeller fan having a blade with a shape that amplifies vibration and noise has the same remarkable effect.

(Embodiment 2)
The blade mounting device for a blower according to the second embodiment of the present invention is different from the first embodiment in that the washer 8 is made of acrylonitrile butadiene rubber.

  By using acrylonitrile butadiene rubber for the washer 8, the physical property change of the washer 8 due to the temperature rise of the electric motor 1 can be reduced, and the acrylonitrile butadiene rubber has oil resistance and suppresses the quality deterioration due to the deterioration of the washer 8. Thus, stable quality can be maintained.

  Even if the washer 8 is made of chloroprene rubber, the same effects as described above can be obtained.

(Embodiment 3)
As shown in FIG. 3, the blade mounting device for a blower according to Embodiment 3 of the present invention forms an annular fitting portion 10 at a position in contact with the roll pin 4 insertion portion of the shaft 3 </ b> A, and has an inner diameter C of the washer 8 </ b> A. It is characterized in that the size is smaller than the bottom diameter D of the fitting groove 10.

  With this configuration, the washer 8A is press-fitted into the fitting groove 10 of the shaft 3A. Therefore, when the blade 2 is removed for cleaning of the blade 2, maintenance of the blower, etc., the washer 8A is accidentally dropped and the washer 8A The blade 2 is not attached to the shaft 3 </ b> A without being fitted, and the washer 8 </ b> A is reliably interposed between the roll pin 4 and the U-shaped groove 7.

(Embodiment 4)
4, the U-shaped groove 7A of the boss portion 6A has a substantially U-shaped inner dimension slightly larger than the diameter of the roll pin 4 on the bottom side of the groove, as shown in FIG. It is characterized in that it is formed in such a manner that the opening side of the groove extends in a substantially V shape.

  With this configuration, when the shaft 3 with the washer 8 in contact with the roll pin 4 is inserted into the boss portion 6A, the roll pin 4 is guided into the V-shaped opening of the U-shaped groove 7A and easily enters. The roll pin 4 reaching the bottom side of the U-shaped groove 7A is held in a stable state in the substantially U-shaped groove.

  A fan mounting device for a blower according to the present invention is a vibration fan provided with a blade mounting device provided with a roll pin on a shaft of an electric motor and a groove engaging with the roll pin on a boss portion of the blade to prevent rotation of the blade. The generation of noise can be suppressed, and the present invention can be widely applied to a fan provided with the blade mounting device having this configuration.

1 is an exploded perspective view of an electric motor and blades of a blade mounting device for a blower according to Embodiment 1 of the present invention. Detailed view of the main parts of the blade mounting device of the blower The figure which shows the dimensional relationship of the shaft and washer of the blade | wing attachment apparatus of the air blower of Embodiment 3 of this invention. The perspective view which shows the boss | hub part and shaft of the blade | wing attachment apparatus of the air blower of Embodiment 4 of this invention. The perspective view which shows the blade | wing attachment apparatus of the conventional air blower

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Blade 3 Shaft 3A Shaft 4 Roll pin 6 Boss part 6A Boss part 7 U-shaped groove 7A U-shaped groove 8 Washer 8A Washer 10 Fit groove A Thickness dimension B Clearance C Inner diameter D Bottom diameter

Claims (8)

A roll pin inserted at a right angle to the axis of the shaft of the electric motor and a boss portion provided at the center of the blade and into which the shaft is inserted. The boss portion has an opening at the end surface on the shaft insertion side. A U-shaped groove with which the roll pin engages is formed in a substantially U shape, and the inner dimension of the U-shaped groove is formed slightly larger than the diameter of the roll pin, and when the shaft is inserted into the boss portion, A fan mounting device for a blower, wherein an elastic washer sandwiched between a U-shaped groove and the roll pin is fitted. 2. A fan blade mounting device according to claim 1, wherein the washer is made of an elastomer. 2. A fan blade mounting device according to claim 1, wherein the washer is made of acrylonitrile butadiene rubber. The blower blade mounting device according to claim 1, wherein the washer is made of chloroprene rubber. The blade mounting device for a blower according to any one of claims 1 to 4, wherein a thickness dimension of the washer is larger than a gap formed between the roll pin and the U-shaped groove. The blower according to any one of claims 1 to 5, wherein an annular fitting groove is provided in a washer fitting portion in contact with a roll pin insertion portion of the shaft, and an inner diameter of the washer is smaller than a bottom diameter of the fitting groove. Blade mounting device. The U-shaped groove formed in the boss part is formed so that the bottom side of the groove is formed in a substantially U shape and the opening side of the groove is expanded in a substantially V shape. The fan | blade blade | wing installation apparatus of description. The fan blade mounting device for a blower according to any one of claims 1 to 7, further comprising a locking unit that locks the front end portion of the shaft and holds the boss portion in a retaining state.

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