JP2015052314A - Blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower for suppressing the occurrence of vibration and abnormal sounds by suppressing the scattering of a drive transmission shaft cap.SOLUTION: The blower includes a motor 3 having a driving shaft 4 at the center, for rotating the driving shaft 4, a drive transmission shaft 5 mounted vertically to the axial direction of the driving shaft 4, a fan 2 to be rotated while being subjected to the rotating force of the motor 3 via the driving shaft 4 and the drive transmission shaft 5, and a drive transmission shaft cap 6 mounted on the drive transmission shaft 5, wherein a scattering suppressing mechanism for the drive transmission shaft cap 6 is provided.

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. A conventional blower is mainly composed of a motor that generates a rotational force, a drive shaft having a drive transmission shaft that transmits the rotational force to the fan, a fan that generates wind, and a knob that fixes the fan (for example, 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, there is a countermeasure against this problem by fitting a fan having a U-shaped groove on a boss to a drive shaft provided with a roll pin via a washer (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 fitted to a drive shaft, there is a problem that the washer is detached during maintenance of the fan, and a torsional force is applied to the washer during operation to cause damage. Furthermore, since the washer is used, there is a problem that the number of parts increases.

  For this problem, measures such as mounting a drive transmission shaft cap on the drive transmission shaft can be considered, but when the fan is inserted into the drive shaft, the connection of the drive transmission shaft cap is caught on the boss of the fan. There was a problem that there was a risk of splattering and scattering by centrifugal force due to rotation. Further, when the drive transmission shaft cap scatters, there is a problem that vibration increases and abnormal noise is generated.

  The present invention has been made to solve the above-described problems, and provides a blower that suppresses the scattering of the drive transmission shaft cap without increasing the number of parts and suppresses the generation of vibration and abnormal noise. It is aimed.

  The blower according to the present invention has a drive shaft in the center, rotates the drive shaft, a drive transmission shaft attached perpendicular to the axial direction of the drive shaft, the drive shaft and the drive transmission A fan that receives a rotational force from the motor via a shaft and rotates, and a drive transmission shaft cap attached to the drive transmission shaft, and has a scattering suppression mechanism for the drive transmission shaft cap.

  According to the blower according to the present invention, the drive transmission shaft cap scattering suppression mechanism can suppress the scattering of the drive transmission shaft cap without increasing the number of components, thereby suppressing the occurrence of vibration and noise.

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 a perspective view of the motor assembly of the air blower concerning Embodiment 1 of this invention. It is sectional drawing at the time of attaching a fan to the motor assembly of FIG. It is the perspective view which showed the state which attaches a press-fit type drive-transmission shaft cap to the drive-transmission shaft of the air blower which concerns on Embodiment 1 of this invention. It is the perspective view which showed the state which attaches a hook type drive-transmission shaft cap to the grooved drive-transmission shaft of the air blower which concerns on Embodiment 2 of this invention. It is the perspective view which showed the state which attaches an I-shaped drive transmission shaft cap to the drive transmission shaft of the air blower which concerns on Embodiment 3 of this invention. It is the perspective view which showed the state which attaches an open type drive-transmission shaft cap to the end open drive-transmission shaft of the air blower concerning Embodiment 4 of this invention. It is the perspective view which showed the state which attaches a cylindrical drive transmission shaft cap to the end open drive transmission shaft of the air blower which concerns on Embodiment 4 of this invention. It is the perspective view which showed the state which attaches an open type drive-transmission shaft cap to the end closed drive-transmission shaft of the air blower concerning Embodiment 5 of this invention. It is the perspective view which showed the state which attaches a cylindrical drive transmission shaft cap to the end closed drive transmission shaft of the air blower which concerns on Embodiment 5 of this invention. It is the perspective view which showed the state which attaches the mountain-shaped drive transmission shaft cap to the cylindrical drive transmission shaft of the air blower concerning Embodiment 6 of this invention. It is the perspective view which showed the state which fitted the cylindrical drive transmission shaft cap to the drive transmission shaft of the air blower concerning Embodiment 7 of this invention, and attached the scattering prevention member.

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, and a drive transmission shaft 5. A motor assembly 102 is constituted by the motor 3, the drive shaft 4, and the drive transmission shaft 5.
The knob 1 is attached to the tip of the drive shaft 4 to fix 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 other fans such as a sirocco fan may be used.

  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.

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.

FIG. 3 is a perspective view of the motor assembly 102 of the blower 101 according to Embodiment 1 of the present invention, and FIG. 4 is a cross-sectional view when the fan 2 is attached to the motor assembly 102 of FIG.
Due to the cogging phenomenon of the motor 3 during operation, the blower 101 is repeatedly vibrated in the rotational direction between the drive transmission shaft 5 and the boss 2a of the fan 2 to increase vibrations or generate abnormal noise.

Therefore, in order to suppress the occurrence of vibration and abnormal noise, the drive transmission shaft 5 is covered with a drive transmission shaft cap 6 made of elastomer, rubber, or resin, and the fan 2 is inserted and attached to the drive shaft 4 in this state.
However, if the drive transmission shaft cap 6 has the joint 60 as shown in FIGS. 3 and 4, the joint 60 is pulled by the tip of the boss 2a of the fan 2, so that it is difficult to attach, and deterioration over time. When the air blower is damaged, there arises a problem that it is scattered by centrifugal force during operation of the blower.

FIG. 5A is a perspective view showing a state where the press-fitting type drive transmission shaft cap 6a is attached to the drive transmission shaft 5 of the blower 101 according to Embodiment 1 of the present invention, and FIG. 5B is a press-fitting type drive. It is sectional drawing of the transmission shaft cap 6a.
Therefore, in the first embodiment, the connection 60 is eliminated by using the bottomed cylindrical press-fitted drive transmission shaft cap 6a having the projection 6a1 with a sharp tip at one end on the inner side and the other end opened. Attach to the shaft 5.

  The drive transmission shaft 5a has a hollow cylindrical shape, and the diameter of the projection 6a1 inside the press-fitted drive transmission shaft cap 6a is slightly larger than the inner diameter of the drive transmission shaft 5a. Therefore, when the press-fitted drive transmission shaft cap 6a is attached to the drive transmission shaft 5, the frictional force can be increased by sandwiching the drive transmission shaft 5a between the protrusion 6a1 and the inside of the press-fitted drive transmission shaft cap 6a.

  As described above, when the press-fit drive transmission shaft cap 6a is attached to the drive transmission shaft 5a as a mechanism for suppressing the scattering of the press-fit drive transmission shaft cap 6a, the friction between the press-fit drive transmission shaft cap 6a and the drive transmission shaft 5 is maintained. The force can suppress the scattering of the press-fitted drive transmission shaft cap 6a without increasing the number of parts, and can stably suppress the generation of vibration and abnormal noise.

  Further, the press-fit type drive transmission shaft cap 6a has a bottom portion 6a2, and when fitted on the drive transmission shaft 5a, covers the tip of the drive transmission shaft 5a, thereby also playing a role of cutting prevention. The drive transmission shaft 5a may have a shape other than a cylindrical shape (for example, a polygonal shape or an elliptical shape). In that case, the equivalent effect can be obtained by making the press-fitted drive transmission shaft cap 6a a shape corresponding to the shape. can get.

Embodiment 2. FIG.
FIG. 6A is a perspective view showing a state in which the hooked drive transmission shaft cap 6b is attached to the grooved drive transmission shaft 5b of the blower 101 according to Embodiment 2 of the present invention, and FIG. It is sectional drawing of the hook type drive transmission shaft cap 6b.
Hereinafter, the second embodiment will be described, but those overlapping with the first embodiment will be omitted.
The grooved drive transmission shaft 5b has a columnar shape or a hollow cylindrical shape, and a groove 5b1 is formed in the upper part on the drive shaft 4 side. The hook-type drive transmission shaft cap 6b has a hollow cylindrical shape, and a hook portion 6b1 having an inclination is provided inside thereof. Then, the hook type drive transmission shaft cap 6b is attached to the grooved drive transmission shaft 5b so that the hook portion 6b1 is hooked in the groove 5b1. In that case, since the hook part 6b1 has an inclination, it is easy to fit in the groove 5b1.

  As described above, when the hook-type drive transmission shaft cap 6b is attached to the grooved drive transmission shaft 5b as a scattering suppression mechanism of the hook-type drive transmission shaft cap 6b, the hook portion 6b1 is hooked on the groove 5b1. Without increasing the number of parts, scattering of the hook-type drive transmission shaft cap 6b can be suppressed, and generation of vibration and abnormal noise can be suppressed stably.

  Further, when the length of the hook-type drive transmission shaft cap 6b is fitted to the grooved drive transmission shaft 5b, the length of the hook-type drive transmission shaft cap 6b is made longer than that of the grooved drive transmission shaft 5b. Because it covers, it also plays a role of cutting prevention. The grooved drive transmission shaft 5b may have a shape other than a cylindrical shape (for example, a polygonal shape or an elliptical shape), but in that case, the hook-type drive transmission shaft cap 6b has a shape corresponding to that, and is equivalent. The effect of.

Embodiment 3 FIG.
FIG. 7 is a perspective view showing a state where the I-shaped drive transmission shaft cap 6c is attached to the drive transmission shaft 5c of the blower 101 according to Embodiment 3 of the present invention.
Hereinafter, the third embodiment will be described, but the description overlapping with the first and second embodiments will be omitted.
The drive transmission shaft 5c has a columnar shape or a hollow cylindrical shape. The I-shaped drive transmission shaft cap 6c has a hollow cylindrical shape in which the central portion 6c1 has an inner diameter larger than the diameter of the drive shaft 4, and has a hollow cylindrical shape having an inner diameter smaller than the inner diameter of the central portion 6c1 at both ends. Each end 6c2 is provided. Moreover, the hole of the center part 6c1 and the hole of the edge part 6c2 are connected, and they are mutually orthogonally crossed.

  The hole of the center part 6c1 is fitted to the drive shaft 4, the center axis of the hole of the end part 6c2 and the hole opened at right angles to the axial direction of the drive shaft 4 is aligned, and in this state, the drive to the hole of the end part 6c2 The transmission shaft 5c is fitted.

  As described above, when the I-shaped drive transmission shaft cap 6c is attached to the drive transmission shaft 5c as a scattering suppression mechanism of the I-shaped drive transmission shaft cap 6c, the central portion 6c1 is perpendicular to the rotation direction of the drive transmission shaft 5. Since the two end portions 6c2 are integrated with the central portion 6c1, the scattering of the I-shaped drive transmission shaft cap 6c is suppressed without increasing the number of parts, and vibration and noise are stably generated. Occurrence can be suppressed.

  Further, the length of the I-shaped drive transmission shaft cap 6c is made longer than the drive transmission shaft 5c when fitted to the drive transmission shaft 5c, so that the tip of the drive transmission shaft 5c is covered, thereby preventing cuts. Also plays the role of Although the drive transmission shaft 5c may have a shape other than a cylindrical shape (for example, a polygonal shape or an elliptical shape), in that case, the I-shaped drive transmission shaft cap 6c has a shape corresponding to the shape, thereby achieving the same effect. Can be obtained.

Embodiment 4 FIG.
FIG. 8A is a perspective view showing a state in which the open type drive transmission shaft cap 6d is attached to the end open drive transmission shaft 5d of the blower 101 according to Embodiment 4 of the present invention, and FIG. FIG. 8C is a sectional view of the open type drive transmission shaft cap 6d inserted into the end open drive transmission shaft 5d, and FIG. 8D is an open type drive transmission shaft cap. 6d is a cross-sectional view in which end portion 5d1 of end open drive transmission shaft 5d is widened by inserting 6d into end open drive transmission shaft 5d.
FIG. 8-1 (a) is a perspective view showing a state where the cylindrical drive transmission shaft cap 6g is attached to the end open drive transmission shaft 5d of the blower 101 according to Embodiment 4 of the present invention, FIG. FIG. 8B is a sectional view of the cylindrical drive transmission shaft cap 6g inserted into the end open drive transmission shaft 5d. FIG. 8C shows the cylindrical drive transmission shaft cap 6g inserted into the end open drive transmission shaft 5d. It is sectional drawing which expanded the edge part 5g1 of the open drive transmission shaft 5g.
Hereinafter, the fourth embodiment will be described, but the description overlapping with the first to third embodiments will be omitted.

  The end open drive transmission shaft 5d has a columnar shape or a hollow cylindrical shape, and its end 5d1 is opened. If one or more cuts are made in the entire end open drive transmission shaft 5d or in the end 5d1, the end 5d1 is easily opened. The open-type drive transmission shaft cap 6d has a hollow cylindrical shape, and the inner diameter of one end 6d1 at one end thereof is larger than the inner diameters of other portions so as not to interfere when the end portion 5d1 of the end open drive transmission shaft 5d is opened. It is getting bigger.

  As shown in FIG. 8 (c), the open type drive transmission shaft cap 6d is fitted to the end open drive transmission shaft 5d where the end portion 5d1 is not open, and in this state, the end portion 5d1 is attached as shown in FIG. 8 (d). By opening, the outer diameter of the end portion 5d1 becomes larger than the inner diameter of the open type drive transmission shaft cap 6d, and the end portion 5d1 is hooked to the one end 6d1.

  Or, as shown in FIG. 8A, the opening of the end portion 5d1 of the end open drive transmission shaft 5d is increased in the cylindrical drive transmission shaft cap 6g to increase the frictional force.

  As described above, when the open type drive transmission shaft cap 6d is attached to the end open drive transmission shaft 5d as the scattering suppression mechanism of the open type drive transmission shaft cap 6d, the end portion 5d1 is caught by the one end 6d1, and the cylinder As a scattering suppression mechanism for the mold drive transmission shaft cap 6g, the open type drive transmission shaft cap 6d and the cylindrical type without increasing the number of parts due to frictional force generated by attaching the cylindrical drive transmission shaft cap 6g to the end open drive transmission shaft 5d. The scattering of the drive transmission shaft cap 6g can be suppressed, and the generation of vibration and abnormal noise can be suppressed stably.

  Further, when the length of the open type drive transmission shaft cap 6d is fitted to the end open drive transmission shaft 5d, it is made longer than the end open drive transmission shaft 5d, thereby covering the tip of the end open drive transmission shaft 5d. Therefore, it also plays a role of cutting prevention. In addition, although the end open drive transmission shaft 5d may have a shape other than a cylindrical shape (for example, a polygonal shape or an elliptical shape), in that case, the open-type drive transmission shaft cap 6d can be equivalently shaped by matching it. The effect can be obtained.

Embodiment 5 FIG.
FIG. 9A is a perspective view showing a state where the open-type drive transmission shaft cap 6e is attached to the end-close drive transmission shaft 5e of the blower 101 according to Embodiment 5 of the present invention, and FIG. 9C is a cross-sectional view of the mold drive transmission shaft cap 6e, FIG. 9C is a cross-sectional view of the open-type drive transmission shaft cap 6e inserted into the end closed drive transmission shaft 5e, and FIG. 9D is an open-type drive transmission shaft cap. 6e is a cross-sectional view in which the end closed drive transmission shaft 5e is inserted and the end portion 5e1 of the end closed drive transmission shaft 5e is expanded.
FIG. 9-1 (a) is a perspective view showing a state in which the cylindrical drive transmission shaft cap 6g is attached to the end closed drive transmission shaft 5e of the blower 101 according to Embodiment 5 of the present invention, and FIG. FIG. 9C is a sectional view of the cylindrical drive transmission shaft cap 6g inserted into the end closed drive transmission shaft 5e. FIG. 9C shows the cylindrical drive transmission shaft cap 6g inserted into the end closed drive transmission shaft 5e. It is sectional drawing which expanded the edge part 5e1 of 5e.
Hereinafter, the fifth embodiment will be described, but the description overlapping with the first to fourth embodiments will be omitted.

  The end closed drive transmission shaft 5e has a columnar shape or a hollow cylindrical shape, and its end 5e1 is crushed. In addition, if one or more cuts are made in the entire end closed drive transmission shaft 5e or the end 5e1, the end 5e1 is likely to be crushed. The open-type drive transmission shaft cap 6e has a hollow cylindrical shape, and the inner diameter of one end 6e1 at one end thereof is larger than the inner diameter of other portions so as not to interfere when the end portion 5e1 of the end-close drive transmission shaft 5e is crushed. It is getting bigger.

  As shown in FIG. 9C, the open type drive transmission shaft cap 6e is fitted to the end closed drive transmission shaft 5e where the end portion 5e1 is not crushed, and in this state, the end portion 5e1 is attached as shown in FIG. 9D. By crushing, the outer diameter of the end portion 5e1 becomes larger than the inner diameter of the open type drive transmission shaft cap 6e, and the end portion 5e1 is hooked on the one end 6e1.

  Alternatively, as shown in FIG. 9-1 (a), the crushing range of the end portion 5e1 of the end closed drive transmission shaft 5e is increased in the cylindrical drive transmission shaft cap 6g so that the frictional force is increased.

  As described above, as a mechanism for suppressing the scattering of the open type drive transmission shaft cap 6e, the end type drive transmission shaft cap 6e is attached to the end closed drive transmission shaft 5e, so that the end portion 5e1 is caught by the one end 6e1, and the cylinder As a mechanism for suppressing the scattering of the mold drive transmission shaft cap 6g, the open type drive transmission shaft cap 6e and the cylindrical type without increasing the number of parts due to the frictional force caused by attaching the cylindrical drive transmission shaft cap 6g to the end closed drive transmission shaft 5e. The scattering of the drive transmission shaft cap 6g can be suppressed, and the generation of vibration and abnormal noise can be suppressed stably.

  Further, when the open type drive transmission shaft cap 6e is fitted to the end closed drive transmission shaft 5e, the length of the open type drive transmission shaft cap 6e is made longer than that of the end closed drive transmission shaft 5e, thereby covering the tip of the end closed drive transmission shaft 5e. Therefore, it also plays a role of cutting prevention. The end closed drive transmission shaft 5e may have a shape other than a cylindrical shape (for example, a polygonal shape or an elliptical shape), but in that case, by setting the open type drive transmission shaft cap 6e to a shape corresponding thereto, an equivalent shape can be obtained. The effect can be obtained.

Embodiment 6 FIG.
FIG. 10 is a perspective view showing a state where the mountain-shaped drive transmission shaft cap 6f is attached to the cylindrical drive transmission shaft 5f of the blower 101 according to Embodiment 6 of the present invention.
Hereinafter, the sixth embodiment will be described, but the description overlapping with the first to fifth embodiments will be omitted.
In order to transmit the rotational force to the cylindrical drive transmission shaft 5f, the fitting processing drive shaft 4f is subjected to fitting processing in which a part of the surface is recessed, and one or more fitting processing portions 4f1 are provided. The cylindrical drive transmission shaft 5f has a hole 5f2 having the same shape as the cross section including the portion into which the fitting drive shaft 4f is fitted, and further, the shaft side that transmits the rotational force to the chevron shaped drive transmission shaft cap 6f. A protrusion 5f1 is provided. The shaft-side protrusion 5f1 protrudes in a direction that is perpendicular to the rotation direction of the fitting drive shaft 4f (not necessarily strictly perpendicular) when the cylindrical drive transmission shaft 5f is fitted to the fitting drive shaft 4f. ing.

The hole 5f2 of the cylindrical drive transmission shaft 5f is larger than the diameter of the fitting drive shaft 4f, and when the cylindrical drive transmission shaft 5f is fitted to the fitting drive shaft 4f, the fitting drive shaft 4f is fitted. It will be caught at the boundary between the part that has not been applied and the part that has not been applied.
When the mountain-shaped drive transmission shaft cap 6f is fitted to the cylindrical drive transmission shaft 5f, a cap-side projection 6f1 is provided at a position corresponding to the shaft-side projection 5f1, and the shaft-side projection 5f1 is fitted to the cap-side projection 6f1. It has a hole so that it can be seen.

  The mountain-shaped drive transmission shaft cap 6f is attached to the cylindrical drive transmission shaft 5f so that the shaft-side projection 5f1 fits into the hole of the cap-side projection 6f1, and in this state, the cylindrical drive transmission shaft 5f is fitted into the fitting portion 4f1. Then, the cap-side protrusion 6f1 is fitted into the U-shaped groove 2a1 of the boss 2a.

  As described above, when the mountain-shaped drive transmission shaft cap 6f is attached to the cylindrical drive transmission shaft 5f as a scattering suppression mechanism for the mountain-shaped drive transmission shaft cap 6f, the hole 5f2 of the cylindrical drive transmission shaft 5f is fitted into the drive shaft 4f. Since the hole of the cap-side protrusion 6f1 is fitted to the shaft-side protrusion 5f1 that protrudes perpendicular to the rotation direction, the scattering of the angle-shaped drive transmission shaft cap 6f is suppressed without increasing the number of parts. In addition, it is possible to stably suppress the generation of vibration and abnormal noise.

  Further, when the mountain-shaped drive transmission shaft cap 6f is fitted to the cylindrical drive transmission shaft 5f, the cap-side projection 6f1 covers the shaft-side projection 5f1, so that it also serves to prevent cutting.

Embodiment 7 FIG.
FIG. 11A is a perspective view showing a state where the cylindrical drive transmission shaft cap 6g is fitted to the drive transmission shaft 5 of the blower 101 according to Embodiment 7 of the present invention and the scattering prevention member 7 is attached. FIG. 11B is a cross-sectional view in which the cylindrical drive transmission shaft cap 6g is inserted into the drive transmission shaft 5 and the anti-scattering member 7 is further inserted. FIG. 11C shows the cylindrical drive transmission shaft cap 6g in the drive transmission shaft 5. FIG. 6 is a cross-sectional view of the end portion 7a of the insertion and scattering prevention member 7 that has been hardened.
Hereinafter, the seventh embodiment will be described, but the description overlapping with the first to sixth embodiments will be omitted.

  The drive transmission shaft 5 has a hollow cylindrical shape. The cylindrical drive transmission shaft cap 6g is also a hollow cylinder. The diameter of the scattering prevention member 7 made of resin is smaller than the inner diameter of the cylindrical drive transmission shaft cap 6g, and its end 7a is larger than the inner diameter of the cylindrical drive transmission shaft cap 6g.

  As shown in FIG. 11B, after the cylindrical drive transmission shaft cap 6g is fitted to the drive transmission shaft 5, the scattering prevention member 7 is inserted into the hollow of the drive transmission shaft 5, and the end portion 7a of the scattering prevention member 7 is inserted. The cylindrical drive transmission shaft cap 6g is caught by the end 7a by applying heat or the like so as to be larger than the inner diameter of the cylindrical drive transmission shaft cap 6g. Note that one end 7 a of the scattering prevention member 7 may be hardened before being inserted into the hollow of the drive transmission shaft 5.

  As described above, as the scattering suppression mechanism for the cylindrical drive transmission shaft cap 6g, the scattering prevention member 7 having the end portion 7a larger than the inner diameter of the cylindrical drive transmission shaft cap 6g is attached, thereby the cylindrical drive transmission shaft cap 6g. Can be prevented from being scattered by being caught by the end portion 7a, and generation of vibration and abnormal noise can be stably suppressed.

The drive transmission shaft cap 6 is made of elastomer, rubber, or resin.
The blower according to the present invention is useful for a blower used for a ventilation fan, an air conditioner, and the like, and can be widely applied to propeller fans, sirocco fans, and the like.

  1 Knob, 2 Fan, 2a Boss, 2a1 U-shaped groove, 3 Motor, 4 Drive shaft, 4f Fitting drive shaft, 4f1 Fitting portion, 5 Drive transmission shaft, 5a Drive transmission shaft, 5b Groove drive transmission shaft, 5b1 Groove, 5c drive transmission shaft, 5d end open drive transmission shaft, 5d1 end, 5e end closed drive transmission shaft, 5e1 end, 5f cylindrical drive transmission shaft, 5f1 shaft side protrusion, 5f2 hole, 5g end open drive transmission shaft 5g1 end, 6 drive transmission shaft cap, 6a press-fit type drive transmission shaft cap, 6a1 protrusion, 6a2 bottom, 6b hook type drive transmission shaft cap, 6b1 hook, 6c I-shaped drive transmission shaft cap, 6c1 center 6c2 End, 6d Open type drive transmission shaft cap, 6d1 Single end, 6e Open type drive transmission shaft cap, 6e1 Single end, 6f Form the drive transmission shaft cap, 6f1 cap-side projection, 6 g cylindrical drive transmission shaft cap, 7-splash prevention member, 7a ends, 60 (of the drive transmission shaft cap) tie, 101 blower 102 motor assembly.

Claims (9)

A motor having a drive shaft in the center 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 drive transmission shaft cap attached to the drive transmission shaft,
A blower having a scattering suppression mechanism for the drive transmission shaft cap. As the scattering suppression mechanism,
The drive transmission shaft is hollow,
The drive transmission shaft cap is hollow, has a protrusion at one end on the inside, and opens at the other end.
The diameter of the protrusion is larger than the inner diameter of the drive transmission shaft,
The blower according to claim 1, wherein scattering of the drive transmission shaft cap is suppressed by sandwiching the drive transmission shaft between the protrusion and the inside of the drive transmission shaft cap. As the scattering suppression mechanism,
The drive transmission shaft has a groove;
The drive transmission shaft cap has a hollow shape and is provided with a hook portion having an inclination inside,
The blower according to claim 1, wherein scattering of the drive transmission shaft cap is suppressed by hooking the hook portion into the groove. As the scattering suppression mechanism,
The drive shaft has a hole opened at right angles to the axial direction;
The drive transmission shaft cap has a hollow shape with a central portion having an inner diameter larger than the diameter of the drive shaft, and hollow end portions having an inner diameter smaller than the inner diameter of the central portion at both ends of the central portion, respectively. Provided, the hole at the center and the hole at the end are connected, they are orthogonal to each other,
The drive transmission shaft cap is formed by fitting the hole in the central portion to the drive shaft, aligning the central axes of the hole in the end portion and the hole in the drive shaft, and fitting the drive transmission shaft in the hole in the end portion. The blower according to claim 1, wherein scattering of the air is suppressed. As the scattering suppression mechanism,
The drive transmission shaft is configured to open at an end,
The drive transmission shaft cap is hollow, and the inner diameter of one end thereof is larger than the inner diameter of the other part,
After fitting the drive transmission shaft cap to the drive transmission shaft whose end is not open, the end of the drive transmission shaft is opened and the outer diameter of the end is larger than the inner diameter of the drive transmission shaft cap. Then, the blower according to claim 1, wherein the blower is restrained from being scattered by being hooked to the one end. As the scattering suppression mechanism,
The drive transmission shaft is configured such that the end portion is crushed,
The drive transmission shaft cap is hollow, and the inner diameter of one end thereof is larger than the inner diameter of the other part,
After fitting the drive transmission shaft cap to the drive transmission shaft whose end portion is not crushed, the end portion of the drive transmission shaft is crushed, and the outer diameter of the end portion is larger than the inner diameter of the drive transmission shaft cap. Then, the blower according to claim 1, wherein the blower is restrained from being scattered by being hooked to the one end. As the scattering suppression mechanism,
A part of the surface of the drive shaft is recessed,
The drive transmission shaft has a hole having the same shape as a cross section including a recessed portion of the drive shaft, and when the drive transmission shaft is fitted to the drive shaft, the drive transmission shaft is perpendicular to the rotation direction. Protruding protrusions are provided, and when the drive transmission shaft is fitted to the drive shaft, it is hooked at the boundary between the recessed portion and the non-recessed portion of the drive shaft,
When the drive transmission shaft cap is fitted to the drive transmission shaft, a protrusion is provided at a position corresponding to the protrusion of the drive transmission shaft, and the protrusion of the drive transmission shaft cap is the protrusion of the drive transmission shaft. Has a hole to fit,
Fitting of the drive transmission shaft cap is suppressed by fitting the hole of the drive transmission shaft to the drive shaft perpendicular to the rotation direction and fitting the projection hole of the drive transmission shaft cap to the projection of the drive transmission shaft. The blower according to claim 1. As the scattering suppression mechanism,
The drive transmission shaft is hollow,
The drive transmission shaft cap is hollow,
A scattering prevention member made of resin is inserted into the hollow of the drive transmission shaft cap, and its end is set larger than the inner diameter of the drive transmission shaft cap to be caught, thereby suppressing the scattering of the drive transmission shaft cap. The blower according to claim 1, wherein The material of the said drive transmission shaft cap is an elastomer, rubber | gum, or resin. The air blower as described in any one of Claims 1-7 characterized by the above-mentioned.

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