JP6700827B2 - Blower - Google Patents

Description

  The present invention relates to a blower including a blower fan made of resin that is rotationally driven by a motor.

  BACKGROUND ART Conventionally, as a technique for fixing a blower fan to a rotating shaft of a motor in a blower, there is one disclosed in Patent Document 1 (Japanese Patent No. 5171544).

  According to claim 1 of Patent Document 1, "a motor having a drive shaft in which a male screw is formed at a tip portion and a D cut portion is formed at a tip side portion, and a shaft hole into which the drive shaft is fitted are provided. A fan that is formed and has an engaging portion formed on its end surface, and that is fastened to the drive shaft; and a nut that is screwed into a male screw of the drive shaft and that fastens the fan to the drive shaft. A locking portion fitted to an engaging portion formed on an end surface of the boss portion, a D-shaped hole into which the D-cut portion of the drive shaft is fitted, and a straight portion of the D-shaped hole, It is fitted in the gap between the D-cut portion of the drive shaft and the female screw of the nut, the inner surface abuts the outer surface of the D-cut portion of the drive shaft, and the corner portion of the outer surface is 0. A tab washer which is provided on an end surface of the boss portion and is fastened to the drive shaft by the nut together with the fan, the tab washer being formed so as to be close to each other with a clearance of about 1 mm. Blower.” (see FIG. 5).

Japanese Patent No. 5171544

  In the blower described in Patent Document 1, by tightening a nut (fixing member), a boss portion is formed between a locking member (see FIG. 2) such as a retaining ring attached to the drive shaft (rotating shaft) and the tab washer. The fan (blower fan) is fixed to the rotating shaft by sandwiching it. In this case, the boss portion of the resin blower fan receives a large compressive force. Therefore, in order to secure the screw fastening force when fixing the blower fan to the rotating shaft, it is necessary to select a material having high mechanical strength for the blower fan, which results in high cost.

  Further, the rotation torque input from the rotation shaft of the motor is applied to the nut side tab having a clearance on the outer surface side. In this case, the nut-side tab is erected on the tab washer in the state of a cantilever, so that when it receives a rotational torque, it undergoes bending deformation and bending stress. Therefore, the rotation strength for transmitting the rotation torque input from the rotation shaft of the motor to the blower fan may be insufficient.

  The present invention has been made in view of such circumstances, and further secures the screw fastening force when fixing the blower fan to the rotation shaft of the motor and the rotation strength for transmitting the rotation torque to the blower fan. It is an object of the present invention to provide a blower that can reduce the cost.

In order to solve the above-mentioned problems, a blower according to the present invention is a motor having a rotation shaft, a resin-made blower fan that is rotationally driven by the motor, and is embedded in the blower fan, and the rotation shaft penetrates. A plate-shaped support plate having a mounting hole, and the rotating shaft has a tip end portion formed with a male screw structure portion, and a base end portion connected to the base end side of the tip end portion. The base end portion has a D-cut surface that is partially formed flat, the blower fan has a through hole through which the rotation shaft passes, and the support plate has the attachment hole formed therein. A base portion and a tongue piece portion extending to the side of the through hole, the tongue piece portion having an engagement surface that engages with the D-cut surface, and embedded in the inner surface of the through hole. It is characterized by being.

  ADVANTAGE OF THE INVENTION According to this invention, cost reduction can be aimed at, securing the screw fastening force at the time of fixing a ventilation fan to the rotating shaft of a motor, and the rotation strength for transmitting a rotation torque to a ventilation fan, further. Can provide a blower.

(A) is a perspective view of a blower concerning one embodiment of the present invention, and (b) is an enlarged perspective view showing the nut vicinity which fixes a blower fan in (a) to a rotating shaft of a motor. 1A is a schematic vertical cross-sectional view of the blower shown in FIG. 1, and FIG. 1B is a schematic vertical cross-sectional view showing an enlarged portion of the blower fan in FIG. 1A fixed to a rotation shaft of a motor. It is a schematic perspective view of the rotating shaft shown by FIG. (A) is a schematic vertical cross-sectional view of the blower fan and the support plate shown in FIG. 1, and (b) is a schematic vertical cross-sectional view showing the vicinity of the through hole in (a) in an enlarged manner. 4A is a front view of the support plate shown in FIG. 4B, FIG. 4B is a right side view of the same, FIG. 4C is a bottom view of the same, and FIG.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In each of the following drawings, common parts are designated by the same reference numerals, and redundant description will be omitted as appropriate.

  FIG. 1A is a perspective view of a blower 100 according to an embodiment of the present invention, and FIG. 1B is a nut 4 for fixing the blower fan 1 in FIG. 1A to a rotating shaft 31 of a motor 3. It is a perspective view which expands and shows. 2A is a schematic vertical cross-sectional view of the blower 100 shown in FIG. 1, and FIG. 2B is an enlarged view of a portion for fixing the blower fan 1 to the rotating shaft 31 of the motor 3 in FIG. 2A. FIG.

In the present embodiment, the case where the blower 100 is a propeller fan applied to a fan device for an outdoor unit of an air conditioner will be described as an example.
As shown in FIGS. 1 and 2, the blower 100 includes a motor 3 having a rotation shaft 31, a resin-made blower fan 1 rotationally driven by the motor 3, a blower fan 1 embedded in the blower 100, and a rotation shaft 31 penetrating therethrough. A support plate 2 having a mounting hole 211 for mounting and a nut 4 as a fixing member for fixing the blower fan 1 to the rotating shaft 31 are provided. The main body 32 of the motor 3 is fixed to a casing (not shown).

FIG. 3 is a schematic perspective view of the rotating shaft 31 shown in FIG.
As shown in FIG. 3, the rotary shaft 31 includes a distal end portion 311 formed with a male screw structure portion 31b, and a proximal end portion 312 connected to the body portion 32 side (the proximal end side) of the distal end portion 311. (See FIG. 2B). The outer diameter D2 of the male screw structure portion 31b is smaller than the outer diameter D1 of the base end portion 312.

  The base portion 312 has a step surface 31c formed at the boundary with the tip portion 311 and a D-cut surface 31a having a flat outer peripheral surface on the tip portion 311 side. The step surface 31c is formed perpendicular to the central axis of the rotating shaft 31. The tip portion 311 has a non-threaded neck portion 31d between the male screw structure portion 31b and the step surface 31c.

4A is a schematic vertical sectional view of the blower fan 1 and the support plate 2 shown in FIG. 1, and FIG. 4B is a schematic vertical sectional view showing the vicinity of the through hole 111 in FIG. 4A in an enlarged manner. It is a figure.
As shown in FIG. 4, the blower fan 1 includes a substantially cylindrical base portion 11 supported by the rotating shaft 31, and a blade portion 12 that is continuously provided on the radially outer side of the base portion 11.

  The base 11 of the blower fan 1 has a through hole 111 through which the rotary shaft 31 penetrates (see FIG. 2B). Specifically, only the portion of the rotary shaft 31 where the D-cut surface 31a of the distal end portion 311 and the proximal end portion 312 are formed can pass through the through hole 111. A part of the inner peripheral surface of the through hole 111 of the blower fan 1 has a flat hole side D that engages with the D-cut surface 31a (see FIG. 2B and FIG. 3) of the base end portion 312 of the rotary shaft 31. A cut surface 111a is formed.

  The blower fan 1 is a resin integrally molded product. A support plate 2 supported by a rotary shaft 31 (see FIG. 2B and FIG. 3) is embedded at the tip end side of the through hole 111 of the blower fan 1 in the axial direction. That is, the support plate 2 is insert-molded on the blower fan 1. An attachment hole 211 through which the rotary shaft 31 penetrates is formed in the center of the support plate 2. Specifically, only the tip 311 of the rotary shaft 31 can penetrate the mounting hole 211.

5(a) is a front view of the support plate 2 shown in FIG. 4(b) (a view seen from the tip side of the rotary shaft 31), FIG. 5(b) is a right side view of the same, and FIG. ) Is a bottom view of the same, and FIG. 5D is a perspective view of the same.
As shown in FIG. 5, the support plate 2 has a base portion 21 in which a mounting hole 211 is formed, and a part of the periphery of the mounting hole 211 of the base portion 21 extends from the through hole 111 of the blower fan 1 (see FIG. ) Reference) side and the tongue piece part 22 extended to the side. A flat engagement that engages with the D-cut surface 31a (see FIG. 2B and FIG. 3) of the base end portion 312 of the rotary shaft 31 on the inside of the tongue piece portion 22 (on the center O side of the mounting hole 211). The surface 22a is formed.

  The support plate 2 is a metal integrally-molded product manufactured by pressing a metal plate such as a steel plate. The tongue piece 22 of the support plate 2 is formed integrally with the base material by punching and bending a metal plate that is the base material. Further, by using the shape of the hole when forming the tongue piece portion 22, the mounting hole 211 through which only the tip portion 311 of the rotating shaft 31 of the motor 3 in which the male screw structure portion 31b is formed is formed. There is.

  The base portion 21 of the support plate 2 has a polygonal outer shape when viewed in the axial direction of the rotating shaft 31. Specifically, the base portion 21 has a quadrangle (rectangle) such as a square or a rectangle. Here, the polygon is a concept including not only a strict polygon but also a substantially polygon in which corners are chamfered or rounded.

  A chamfer 212 is provided on a part of the plurality of corners of the polygon in the base portion 21. Here, the chamfer 212 is provided at one of the four corners of the quadrangle, but the invention is not limited to this, and the chamfer 212 is provided at two or three of the four corners. It may be.

  Further, a cutout 213 is provided in at least one of the sides of the polygon in the base portion 21. Reference numeral 214 in FIG. 5 indicates the side surface of the base portion 21 that constitutes the side of the polygon. Here, the notch 213 is provided on three of the four sides of the quadrangle, but the present invention is not limited to this, and the chamfer 212 is provided on one, two, or four of the four sides. May be provided.

  When viewed from the axial direction of the rotation shaft 31, the mounting hole 211 of the base portion 21 of the support plate 2 is larger than the outer diameter D2 of the male screw structure portion 31b of the tip end portion 311 of the rotation shaft 31 and the base end of the rotation shaft 31. It has an arc 211a having an outer diameter D smaller than the outer diameter D1 of the portion 312 (see FIG. 2B). That is, the arc 211a of the mounting hole 211 is formed so as to satisfy the relationship of D2<D<D1.

  Further, when viewed from the axial direction of the rotating shaft 31, a distance L between a point where a straight line passing through the center O of the arc 211a and perpendicular to the engagement surface 22a intersects the engagement surface 22a and a point where the straight line intersects the arc 211a is The diameter is larger than the outer diameter D2 of the male screw structure portion 31b of the tip 311 of the rotary shaft 31 (see FIG. 2B). In addition, the distance L intersects with a point where a straight line passing through the center of the rotating shaft 31 and perpendicular to the D-cut surface 31a intersects the D-cut surface 31a and an outer peripheral surface of the base end portion 312 on the opposite side of the D-cut surface 31a. It is configured to be smaller than the distance L1 from the point (see FIG. 2B). That is, the engagement surface 22a and the arc 211a are formed so as to satisfy the relationship of D2<L<L1.

  The support plate 2 is embedded in the blower fan 1 such that the circumferential position of the tongue piece portion 22 in the circumferential direction of the mounting hole 211 matches the circumferential position of the hole-side D-cut surface 111a in the circumferential direction of the through hole 111. (See FIG. 2B).

  As shown in FIG. 2B, the engagement surface 22 a of the tongue piece 22 of the support plate 2 is arranged in the same plane as the hole-side D-cut surface 111 a of the through hole 111 of the blower fan 1. Here, the fact that the two surfaces are arranged in the same plane is a concept including the case where the two surfaces are strictly in the same plane and the case where they are slightly deviated. For example, the surface of the engagement surface 22a of the tongue piece 22 may be covered with a thin resin layer forming a part of the hole-side D-cut surface 111a.

  The nut 4 has a female screw structure 4a that is screwed into the male screw structure 31b of the tip end 311 of the rotary shaft 31, and a seat surface 4b that abuts and presses against the base 21 of the support plate 2. There is. The base portion 21 of the support plate 2 is sandwiched between the step surface 31c of the base end portion 312 of the rotary shaft 31 and the seat surface 4b of the nut 4.

Next, a method of attaching the blower fan 1 to the rotary shaft 31 of the motor 3 will be described.
First, the blower fan 1 is supported by the rotary shaft 31 of the motor 3 so that the rotary shaft 31 penetrates the through hole 111 of the blower fan 1 from its tip side. At this time, the circumferential position of the D-cut surface 31a of the rotating shaft 31 and the circumferential position of the hole-side D-cut surface 111a of the blower fan 1 and the tongue portion 22 of the support plate 2 are matched. Further, the blower fan 1 is pushed into the main body portion 32 side of the motor 3 until the support plate 2 embedded in the blower fan 1 contacts the step surface 31c of the rotating shaft 31.

  Then, the nut 4 is fastened to the male screw structure portion 31b of the tip portion 311 of the rotating shaft 31. By screwing the nut 4 into the male screw structure portion 31b, the base portion 21 of the support plate 2 is sandwiched between the step surface 31c of the base end portion 312 of the rotating shaft 31 and the seat surface 4b of the nut 4. As a result, the blower fan 1 is fixed to the rotary shaft 31 of the motor 3.

  In the blower 100 configured as described above, when the motor 3 is operated, the blower fan 1 fixed to the rotating shaft 31 is rotationally driven, and the blower operation of the blower 100 is performed. At this time, the rotational torque that rotates the rotary shaft 31 of the motor 3 causes the engagement surface 22a of the tongue portion 22 that engages the D cut surface 31a of the rotary shaft 31 and the hole side D cut surface 111a of the blower fan 1 to be engaged. It is transmitted to the base portion 11 of the blower fan 1 via. As a result, the blower fan 1 having the blades 12 rotates and blows air.

  As described above, in the blower 100 according to the present embodiment, the support plate 2 having the mounting hole 211 through which the rotating shaft 31 having the male screw structure portion 31b penetrates is embedded in the blower fan 1. The support plate 2 has a base portion 21 having a mounting hole 211 formed therein, and a tongue piece portion 22 extending toward the through hole 111. The tongue piece portion 22 has an engaging surface 22a that engages with the D-cut surface 31a of the rotary shaft 31, and is embedded in the inner surface of the through hole 111.

According to this embodiment, the blower fan 1 can be firmly fixed to the rotary shaft 31 by screwing the base portion 21 to the rotary shaft 31 using the male screw structure portion 31b of the rotary shaft 31. . That is, unlike the conventional case, a large compressive force is not generated in the boss portion of the resin-made blower fan, so that the screw fastening force can be sufficiently secured.
Moreover, it is not always necessary to select a material having high mechanical strength (for example, ASG resin) for the blower fan 1, and it is possible to use a softer and cheaper material (for example, PPG resin).
Further, the rotation torque input from the rotation shaft 31 of the motor 3 can be received by the engagement surface 22 a of the tongue piece 22 of the support plate 2 embedded in the inner surface of the through hole 111. Here, since the outer surface side of the tongue piece portion 22 (the side opposite to the center O of the mounting hole 211) is firmly supported by the inner wall of the through hole 111, the occurrence of bending deformation and bending stress is effectively suppressed. You can Therefore, it is possible to sufficiently secure the rotation strength for transmitting the rotation torque input from the rotation shaft 31 of the motor 3 to the blower fan 1.
That is, according to this embodiment, the screw fastening force for fixing the blower fan 1 to the rotating shaft 31 of the motor 3 and the rotational strength for transmitting the rotation torque to the blower fan 1 are ensured, and the cost is reduced. The blower 100 that can reduce the number can be provided.

  In addition, the present embodiment has the nut 4 that fixes the blower fan 1 to the rotating shaft 31, and the base portion 21 of the support plate 2 embedded in the tip end side of the through hole 111 of the blower fan 1 is the rotating shaft. It is sandwiched between the step surface 31c of 31 and the seat surface 4b of the nut 4. According to such a configuration, by tightening the nut 4, the blower fan 1 is fixed by sandwiching the base portion 21 of the support plate 2 between the step surface 31c of the rotating shaft 31 and the seat surface 4b of the nut 4. It can be firmly fixed to the rotating shaft 31.

  In addition, in the present embodiment, the support plate 2 is a metal integrally molded product, specifically, a press integrally molded product manufactured by integrally molding a metal plate by press working, and the tongue piece portion 22 is a base. The part 21 extends from a part of the peripheral edge of the mounting hole 211. In this case, the tongue piece 22 is formed by punching and L-shaped bending the metal plate, and the male screw structure portion 31b of the rotary shaft 31 is formed by using the shape of the hole when forming the tongue piece 22. It is possible to configure the attachment hole 211 through which only the formed tip portion 311 can penetrate. Therefore, since the support plate 2 can be efficiently manufactured, the productivity is improved and the cost can be further reduced.

  Further, in this embodiment, a flat hole-side D-cut surface 111a that engages with the D-cut surface 31a of the rotary shaft 31 is formed on a part of the inner peripheral surface of the through hole 111 of the blower fan 1, and the tongue piece The flat engagement surface 22a of the portion 22 is arranged in the same plane as the hole side D-cut surface 111a. With such a configuration, both the engagement surface 22a of the tongue piece 22 and the hole-side D-cut surface 111a of the blower fan 1 can receive the rotational torque. Therefore, the rotation strength for transmitting the rotation torque input from the rotation shaft 31 of the motor 3 to the blower fan 1 can be further improved.

  Further, in the present embodiment, the base portion 21 of the support plate 2 has a polygonal outer shape when viewed in the axial direction of the rotating shaft 31. With this configuration, the rotational force (circumferential force) applied to the blower fan 1 from the support plate 2 can be reliably received within the plane of the support plate 2. Further, in the present embodiment, specifically, since the base portion 21 of the support plate 2 has a quadrangle (rectangle), the support plate 2 is sucked and held when the support plate 2 is transferred by, for example, a robot hand. It becomes easy to secure a region to be formed near the corner portion of the quadrangle in the support plate 2.

  Further, in the present embodiment, a chamfer 212 is provided at a part of the plurality of corners of the polygon in the base portion 21 of the support plate 2. With such a configuration, it is easy to identify the front and back of the support plate 2 and to make the direction of the engagement surface 22a of the tongue portion 22 of the support plate 2 coincide with the predetermined direction. Therefore, when insert-molding the support plate 2 into the blower fan 1, the support plate 2 which is a component can be picked up by, for example, a robot hand, and can be automatically taken out to be set in a jig provided in a forming die. Therefore, it can contribute to the improvement of productivity.

  Further, in the present embodiment, the notch 213 is provided in at least one of the sides of the polygon in the base portion 21 of the support plate 2. With this configuration, the side surface 214 of the base portion 21 can be formed with an uneven shape. Therefore, when insert-molding the support plate 2 into the blower fan 1, it is possible to increase the direction in which the resin contacts the side surface 214 of the support plate 2 and the area in which the resin contacts. As a result, even if there is a portion where the resin does not completely wrap around the flat surface portion of the side surface 214 of the base portion 21 that does not have unevenness, the base portion 21 is held by the resin that has entered the notch 213. Therefore, the rattling of the support plate 2 can be suppressed more reliably.

  Further, in the present embodiment, the outer diameter D2 of the male screw structure portion 31b is smaller than the outer diameter D1 of the base end portion 312, and the arc 211a of the mounting hole 211 is D2<D (outer diameter of the arc 211a)<D1. It is formed to satisfy the relationship. With such a configuration, the stepped surface 31c of the rotating shaft 31 and the seat of the nut 4 are secured while ensuring the shape of the mounting hole 211 having a size required to form the tongue piece portion 22 having the engagement surface 22a. A structure for sandwiching the base portion 21 of the support plate 2 with the surface 4b can be reliably established.

  Further, in the present embodiment, the engagement surface 22a and the arc 211a satisfy the relationship of D2 (outer diameter of male screw structure portion 31b)<distance L (see FIG. 5)<distance L1 (see FIG. 2(b)). Is formed in. According to this structure, the tongue piece portion 22 having the engaging surface 22a capable of reliably receiving the rotation torque input from the rotation shaft 31 of the motor 3 is formed by press-molding the base material while rotating. A structure for sandwiching the base portion 21 of the support plate 2 between the step surface 31c of the shaft 31 and the seat surface 4b of the nut 4 can be reliably established.

  Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-described embodiments and includes various further modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Further, it is possible to add/delete/replace other configurations with respect to a part of the configurations of the above-described embodiment.

  For example, in the above-described embodiment, the case where the blower 100 is the propeller fan applied to the fan device for the outdoor unit of the air conditioner has been described, but the present invention is not limited to this. The present invention can be applied to, for example, indoor unit fan devices (turbo fans, propeller fans), commercial fan devices, ventilation devices, and the like.

  Further, in the above-described embodiment, the rotary shaft 31 of the motor 3 is arranged so as to be horizontal, but the present invention is not limited to this, and it may be arranged so as to be vertically upward or downward. ..

  Further, in the above-described embodiment, the case where the seat surface 4b of the nut 4 directly contacts and presses the base portion 21 of the support plate 2 has been described, but the present invention is not limited to this, and the seat surface of the nut 4 is not limited thereto. A member such as a washer may be interposed between the surface 4b and the base portion 21 of the support plate 2.

1 Blower Fan 11 Base 111 Through Hole 111a Hole D Cut Surface 12 Blade 2 Support Plate 21 Base 211 Attachment Hole 211a Arc 212 Chamfer 213 Notch 214 Side 22 Tongue 22a Engagement 3 Motor 31 Rotating Shaft 311 Tip Part 312 Base end part 31a D cut surface 31b Male screw structure part 31c Step surface 31d Neck part 32 Main body part 4 Nut (fixing member)
4a Female screw structure part 4b Seat surface 100 Blower

Claims (9)

A motor having a rotating shaft,
A blower fan made of resin that is rotationally driven by the motor,
A plate-shaped support plate embedded in the blower fan and having a mounting hole through which the rotary shaft penetrates,
The rotating shaft has a distal end portion formed with a male screw structure portion, and a proximal end portion continuously provided on the proximal end side of the distal end portion,
The base end portion has a D-cut surface that is partially flat.
The blower fan has a through hole through which the rotary shaft passes,
The support plate has a base portion in which the mounting hole is formed, and a tongue piece portion that extends toward the through hole,
The blower, wherein the tongue piece portion has an engagement surface that engages with the D-cut surface and is embedded in the inner surface of the through hole. A fixing member for fixing the blower fan to the rotating shaft,
The fixing member has a female screw structure portion that is screwed into the male screw structure portion, and a seat surface that presses the base portion of the support plate,
The base end portion has a step surface formed at a boundary with the tip end portion,
The D-cut surface is formed on a part of an outer peripheral surface of the base end portion on the tip end side,
The support plate is embedded on the tip side in the axial direction of the through hole of the blower fan,
The blower according to claim 1, wherein the base portion of the support plate is sandwiched between the step surface of the base end portion and the seat surface of the fixing member.   The blower according to claim 1, wherein the support plate is an integrally molded product made of metal, and the tongue portion extends from a part of a peripheral edge of the mounting hole of the base portion. A flat hole-side D-cut surface that engages with the D-cut surface is formed on a part of the inner peripheral surface of the through hole of the blower fan.
The blower according to claim 1, wherein the flat engagement surface of the tongue portion is arranged in the same plane as the hole-side D-cut surface.   The blower according to claim 1, wherein the base portion of the support plate has a polygonal outer shape when viewed in the axial direction of the rotating shaft.   The blower according to claim 5, wherein a chamfer is provided at a part of a plurality of corners of the polygon in the base portion.   The blower according to claim 5, wherein a cutout is provided in at least one of the sides of the polygon in the base portion. The outer diameter of the male screw structure portion is smaller than the outer diameter of the base end portion,
When viewed from the axial direction of the rotation shaft, the mounting hole of the base portion of the support plate has an arc of an outer diameter larger than the outer diameter of the male screw structure portion and smaller than the outer diameter of the base end portion. The blower according to any one of claims 1 to 7, characterized in that it has.   When viewed from the axial direction of the rotating shaft, the distance between the point where a straight line passing through the center of the arc and perpendicular to the engaging surface intersects the engaging surface and the point where the arc intersects is the male screw structure. At a point where a straight line that is larger than the outer diameter of the portion and that passes through the center of the rotation axis and that is perpendicular to the D-cut surface intersects the D-cut surface, and the outer peripheral surface of the base end portion that is opposite to the D-cut surface. The blower according to claim 8, which is smaller than a distance between the intersecting points.

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