JP2023095175A - Blower device - Google Patents

Abstract

To provide a blower device capable of improving air blowing efficiency.SOLUTION: A blower device includes a pair of fan parts, a housing part, and a lid part. The pair of fan parts generate an airflow on one side in the axial direction along a central axis, and are arranged coaxially. The housing part is formed in a cylindrical shape along the central axis, stores the pair of fan parts, and has open axial end surfaces. The lid part covers the corresponding one of one end surface in the axial direction and the other end surface in the axial direction of the housing part, and ventilates. Each of the pair of fan parts is fixed to the corresponding lid part, and has a motor for rotating an impeller. The impeller includes an impeller cylinder part, an impeller lid part, and a blade part. The impeller cylinder part is arranged outside in the radial direction of the motor, and extends in the axial direction. The impeller lid part covers an end surface in the axial direction of the impeller cylinder part, on the opposite side in the axial direction from the lid part where the motor is fixed. The plurality of blade parts are arrayed in the circumferential direction on an outer surface in the radial direction of the impeller cylinder part. In the pair of fan parts, the respective impeller lid parts directly face with each other in the axial direction.SELECTED DRAWING: Figure 4

Description

The present invention relates to blowers.

A conventional air blower has a housing that surrounds a central axis by axially connecting a first split housing unit and a second split housing unit. The first split housing unit accommodates a first motor that rotates the first impeller about its central axis. A second split housing unit accommodates a second motor that rotates the second impeller about the central axis. At this time, the first supporting frame main body half portion for fixing the first motor and the second supporting frame main body half portion for fixing the second motor are arranged facing the axially central portion in the housing. (See Patent Document 1, for example).

Patent No. 3904595

However, in the conventional air blower, the airflow in the housing may be disturbed by the first support frame main body half and the second support frame main body half, and the air blowing efficiency may be lowered.

An object of the present invention is to provide an air blower capable of improving air blowing efficiency.

An exemplary blower device of the present invention includes a pair of fan portions, a housing portion and a lid portion. The pair of fan parts generate an airflow on one side in the axial direction along the central axis and are arranged coaxially. The housing portion is formed in a cylindrical shape extending along the central axis, accommodates the pair of fan portions, and is open at both axial end surfaces. The lid portion covers the one axial end surface and the other axial end surface of the housing portion and ventilates them. A pair of fan parts are each fixed to the lid part and have a motor for rotating the impeller. The impeller has an impeller tubular portion, an impeller lid portion, and blade portions. The impeller tubular portion is arranged radially outwardly of the motor and extends axially. The impeller lid portion covers the axial end face of the impeller tubular portion on the side opposite to the lid portion to which the motor is fixed in the axial direction. A plurality of blade portions are arranged in the circumferential direction on the radial outer surface of the impeller tubular portion. The pair of fan portions are directly opposed to each other in the axial direction.

ADVANTAGE OF THE INVENTION According to this exemplary invention, the air blower which can improve air blowing efficiency can be provided.

FIG. 1 is an overall perspective view of a blower device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the blower device according to the embodiment of the present invention. FIG. 3 is a side view of the blower according to the embodiment of the invention. FIG. 4 is a longitudinal cross-sectional perspective view of the air blower according to the embodiment of the present invention. FIG. 5 is an exploded perspective view showing an enlarged part of the blower device according to the embodiment of the present invention. FIG. 6 is an exploded perspective view showing an enlarged part of the blower device according to the embodiment of the present invention. FIG. 7 is a perspective view showing the lid portion of the blower according to the embodiment of the present invention. FIG. 8 is a perspective view showing an enlarged part of the blower device according to the embodiment of the present invention.

Exemplary embodiments of the invention are described in detail below with reference to the drawings. In this document, the direction in which the central axis J of the blower 1 extends is simply referred to as the "axial direction", and the direction perpendicular to the central axis J of the blower 1 as the center is simply referred to as the "radial direction". A direction along an arc centered on the central axis J of 1 is simply referred to as a "circumferential direction". A cross section parallel to the axial direction is called a "longitudinal cross section." Also, "parallel" does not mean parallel in a strict sense, but includes substantially parallel.

For convenience of explanation, the shape and positional relationship of each part will be described with the axial direction being the vertical direction and the vertical direction in FIG. For example, the one side in the axial direction is referred to as the upper side in the axial direction or the upper side. The other side in the axial direction is referred to as the axial lower side or the lower side. Moreover, let the axial direction one end be an upper end, and let an axial direction other end be a lower end. Further, one axial end surface is defined as an upper end surface, and the other axial end surface is defined as a lower end surface. The "upper side" of the air blower 1 is the "intake side", and the "lower side" is the "exhaust side". It should be noted that this definition of the vertical direction does not limit the orientation and positional relationship when the blower 1 is in use.

<1. Overall Configuration of Air Blower>
FIG. 1 is an overall perspective view of an example of a blower device 1 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the blower device 1. As shown in FIG. The blower device 1 includes a pair of fan portions 2a and 2b, a housing portion 4, and lid portions 5a and 5b.

The fan portions 2a and 2b are coaxially arranged along the central axis J to generate an airflow on the axial lower side (one axial side) X1. The fan section 2a is arranged on the intake side, and has an impeller 21a, a motor 22, and a circuit board 23. As shown in FIG. The fan section 2b is arranged on the exhaust side, and has an impeller 21b, a motor 22, and a circuit board 23. As shown in FIG. In the present embodiment, the fan section 2a and the fan section 2b have the same configuration of the motor 22 and the circuit board 23, and will be described with the same reference numerals.

The housing portion 4 is formed in a cylindrical shape extending along the central axis J, accommodates the pair of fan portions 2a and 2b, and is open at both axial end surfaces. The housing part 4 has an air flow path through which an air current flows. The housing portion 4 has an exhaust port 42 on the lower end surface (one end surface in the axial direction) and an intake port 41 on the upper end side (the other end surface in the axial direction).

The lid portion 5a covers the intake port 41 (the other end surface in the axial direction) of the housing portion 4 to allow ventilation. The lid portion 5b covers the exhaust port 42 (the other end surface in the axial direction) of the housing portion 4 to allow ventilation. The fan portion 2a is fixed to the lid portion 5a, and the fan portion 2b is fixed to the lid portion 5b.

The lid portions 5a and 5b and the housing portion 4 are resin molded products, and the material forming the lid portions 5a and 5b and the material forming the housing portion 4 are different. Specifically, the Young's modulus of the material forming the lid portions 5 a and 5 b is higher than the Young's modulus of the material forming the housing portion 4 . Thereby, the vibration frequency of the lid portions 5a and 5b and the vibration frequency of the housing portion 4 can be changed. Therefore, resonance of the lid portions 5a and 5b and the housing portion 4 can be reduced. Thereby, the vibration of the air blower 1 can be reduced.

Specifically, when polyphenylene sulfide or polybutylene terephthalate is used as the material of the lids 5a and 5b, polyphenylene ether can be suitably used as the material of the housing 4. Further, when polyphenylene sulfide is used as a material for forming the lids 5a and 5b, polybutylene terephthalate can be suitably used as a material for forming the housing 4. FIG. By using these materials, the vibration of the blower device 1 can be further reduced while maintaining the strength of the lid portions 5a and 5b and the housing portion 4 .

<2-1. Configuration of impeller>
FIG. 3 is a side view of the blower device 1, in which the housing part 4 is omitted. The impeller 21 a is arranged radially outside the motor 22 and is rotated around the central axis J by the motor 22 . The impeller 21 b is arranged radially outside the motor 22 and is rotated around the central axis J by the motor 22 . The direction of rotation of the impeller 21a is opposite to the direction of rotation of the impeller 21b. Note that the rotational direction of the impeller 21a and the rotational direction of the impeller 21b may be the same depending on the shape of the impellers 21a and 21b.

The impeller 21a has an impeller cup 211a and a plurality of blades 212a. Impeller cup 211 a is fixed to motor 22 . The impeller cup 211a has an impeller tubular portion 2112a and an impeller lid portion 2111a. The impeller tubular portion 2112a is arranged radially outside the motor 22 of the fan portion 2a and extends in the axial direction. The impeller lid portion 2111a covers the lower end surface (one end surface in the axial direction) of the impeller cylindrical portion 2112a. The plurality of blades 212a are arranged in the circumferential direction on the outer surface of the impeller cylindrical portion 2112a.

The impeller 21b has an impeller cup 211b and a plurality of blades 212b. Impeller cup 211 b is fixed to motor 22 . The impeller cup 211b has an impeller cylindrical portion 2112b and an impeller lid portion 2111b. The impeller tubular portion 2112b is arranged radially outside the motor 22 of the fan portion 2b and extends in the axial direction. The impeller lid portion 2111b covers the upper end surface (the other end surface in the axial direction) of the impeller cylindrical portion 2112b. The plurality of blades 212b are arranged in the circumferential direction on the outer surface of the impeller tubular portion 2112b.

The inclination angle of the blades 212a with respect to the central axis J when the impeller 21a arranged on the intake side is expanded in the circumferential direction is the inclination angle of the blades 212b with respect to the central axis J when the impeller 21b arranged on the exhaust side is expanded in the circumferential direction. less than the tilt angle. Thereby, the air volume of the impeller 21a can be made larger than the air volume of the impeller 21b, and air can be efficiently sucked, and the air blowing efficiency of the air blower 1 can be further improved. The angle of inclination is the mounting angle of the blades 212a and 212b.

The impeller lid portion 2111a and the impeller lid portion 2111b directly face each other in the axial direction without any other member disposed therebetween. As a result, the impeller 21a and the impeller 21b are arranged close to each other in the axial direction, and the flow of airflow into the gap between the impeller lid portion 2111a and the impeller lid portion 2111b can be reduced. As a result, the airflow inside the housing portion 4 can be smoothly circulated. Therefore, the ventilation efficiency in the housing part 4 can be improved.

In addition, the impeller lid portion 2111a and the impeller lid portion 2111b are arranged parallel to a plane perpendicular to the central axis J. Thereby, the impeller lid portion 2111a and the impeller lid portion 2111b can be arranged closer to each other. Therefore, it is possible to further reduce the inflow of the airflow into the gap between the impeller lid portion 2111a and the impeller lid portion 2111b.

The impeller lid portion 2111a has an annular impeller projection portion 2113a arranged at the radially outer end portion and projecting axially downward (axially one side) X1 (see FIG. 4). The impeller lid portion 2111b has an annular impeller projection portion 2113b arranged at the radially outer end portion and projecting axially upward (axially the other side) X2 (see FIG. 4). Thereby, it is possible to further reduce the inflow of the airflow into the gap between the impeller lid portion 2111a and the impeller lid portion 2111b. At least one of the impeller protrusions 2113a and the impeller protrusions 2113b may be provided in a plurality in the radial direction. Thereby, it is possible to further reduce the inflow of the airflow into the gap between the impeller lid portion 2111a and the impeller lid portion 2111b. Moreover, the impeller protrusion part 2113a and the impeller protrusion part 2113b may be divided and formed in multiple numbers in the circumferential direction.

In addition, the impeller protrusion 2113a and the impeller protrusion 2113b face each other in the axial direction and extend parallel to the axial direction. As a result, it is possible to suppress the disturbance of the airflow flowing along the impeller projections 2113a and 2113b. Note that the impeller protrusion 2113a and the impeller protrusion 2113b may be displaced in the radial direction. In this case, it is preferable that one tip of the impeller protrusion 2113a and the impeller protrusion 2113b extends further to the root side than the tip of the other. Thereby, it is possible to further reduce the inflow of the airflow into the gap between the impeller lid portion 2111a and the impeller lid portion 2111b.

The outer peripheral surfaces of the impeller tubular portions 2112a and 2112b are parallel to the axial direction, and the outer diameter of the impeller tubular portion 2112a and the outer diameter of the impeller tubular portion 2112b are the same size. Thereby, the airflow can be smoothly circulated from the outer peripheral surface of the impeller tubular portion 2112a to the outer peripheral surface of the impeller tubular portion 2112b. The outer peripheral surfaces of the impeller tubular portions 2112a and 2112b may be parallel to the axial direction, and the outer diameter of the impeller tubular portion 2112a and the outer diameter of the impeller tubular portion 2112b may be different sizes. Further, the outer peripheral surface of the impeller tubular portion 2112a and the outer peripheral surface of the impeller tubular portion 2112b may be formed in a truncated cone shape that is inclined radially outward as they approach each other in the axial direction.

<2-2. Configuration of Motor>
FIG. 4 is a vertical cross-sectional perspective view of the blower device 1. FIG. A pair of motors 22 are fixed to the lids 5a and 5b, respectively. The motor 22 on the intake side (the other in the axial direction) X2 rotates the impeller 21a around the central axis J. The motor 22 on the exhaust side (one side in the axial direction) X1 rotates the impeller 21b around the central axis J. The motor 22 has a shaft 221 , bearings 222 , a stator 223 and a rotor 224 .

The shaft 221 extends along the central axis J. The shaft 221 is a columnar member made of metal such as stainless steel and extending in the axial direction.

The bearings 222 are arranged as a pair at least axially opposite each other. The bearing 222 is configured by, for example, a ball bearing, but may be configured by a sleeve bearing or the like. A pair of bearings 222 supports the shaft 221 rotatably around the central axis J with respect to the housing portion 4 .

The stator 223 has a bearing holding portion 223a, a stator core 223b, an insulator 223c, and a coil (not shown). The bearing holding portion 223a is formed in a cylindrical shape and holds the bearing 222 inside.

The upper end (outer end in the axial direction) of the bearing holding portion 223a of the fan portion 2a is fitted into the fitting hole 511 of the lid portion 5a. Thereby, the bearing holding portion 223a is fixed to the lid portion 5a, and the fan portion 2a and the lid portion 5a are fixed. Note that the bearing holding portion 223a and the lid portion 5a may be formed integrally with metal.

The lower end (outer end in the axial direction) of the bearing holding portion 223a of the fan portion 2b is fitted into the fitting hole 511 of the lid portion 5b. Thereby, the bearing holding portion 223a is fixed to the lid portion 5b, and the fan portion 2b and the lid portion 5b are fixed. Note that the bearing holding portion 223b and the lid portion 5b may be formed integrally with metal.

The stator core 223b is configured by vertically laminating electromagnetic steel plates such as silicon steel plates. The insulator 223c is made of an insulating resin. The insulator 223c is provided surrounding the outer surface of the stator core 223b. A coil (not shown) is composed of a conductive wire wound around the stator core 223b via an insulator 223c.

The rotor 224 rotates around the central axis J with respect to the stator 223 . The rotor 224 has a rotor yoke 224a and magnets 224b.

The rotor yoke 224a is a substantially cylindrical member that is made of a magnetic material and has a lid on the inner side in the axial direction. The rotor yoke 224a of the fan portion 2a is fixed to the lower end portion (axial inner end portion) of the shaft 221 . A rotor yoke 224a of the fan portion 2b is fixed to the upper end portion (axial inner end portion) of the shaft 221 . The magnet 224b is cylindrical and fixed to the inner peripheral surface of the rotor yoke 224a. The magnet 224b is arranged radially outside the stator 223 .

<2-3. Configuration of Circuit Board>
The circuit board 23 of the fan section 2a is arranged between the stator core 223b and the lid section 5a, and the circuit board 23 of the fan section 2b is arranged between the stator core 223b and the lid section 5b. The circuit board 23 has, for example, a disk shape extending radially about the central axis J. As shown in FIG. A lead wire of a coil (not shown) is electrically connected to the circuit board 23 . An electronic circuit for supplying drive current to a coil (not shown) is mounted on the circuit board 23 .

The outer diameter of the circuit board 23 is equal to or smaller than the outer diameter of the impeller tubular portions 2112a and 2112b. Thereby, the airflow inside the housing portion 4 can be more smoothly circulated.

In the fan portions 2a and 2b configured as described above, when a drive current is supplied to the coil (not shown) of the motor 22 via the circuit board 23, radial magnetic flux is generated in the stator core 223b. A magnetic field generated by the magnetic flux of the stator core 223 b and a magnetic field generated by the magnet 224 b act to generate torque in the circumferential direction of the rotor 224 . This torque causes the rotor 224 and the impellers 21a and 21b to rotate about the central axis J, respectively. As the impellers 21a, 21b rotate, airflow is generated by the plurality of blades 212a, 212b. As a result, the fan portions 2a and 2b generate an airflow with the axially upper side (the other side in the axial direction) X1 as the intake side and the axially lower side (the one side in the axial direction) X2 as the exhaust side, thereby blowing air. can be done.

<3. Structure of Lid>
5 and 6 are exploded perspective views of the housing portion 4 and the lid portion 5a. FIG. 5 shows the housing portion 4 and the lid portion 5a viewed from the axial upper side (the other axial side) X2. FIG. 6 shows a state in which the housing portion 4 and the lid portion 5a are viewed from the axial lower side (the one side in the axial direction) X1. FIG. 7 is a perspective view of the lid portion 5a, showing a state in which the lid portion 5a is viewed from the axial lower side (one axial side) X1.

The lid portion 5 a and the lid portion 5 b have a fixing portion 51 , a connecting portion 52 and an annular portion 53 . In the present embodiment, the lid portion 5a and the lid portion 5b have the same configuration of the fixed portion 51, the connecting portion 52, and the annular portion 53, and will be described with the same reference numerals. The fixing portion 51 is arranged radially inside the annular portion 53 .

The fixing portion 51 of the lid portion 5a is arranged on the axial upper side (the other axial side) X2 of the fan portion 2a, and has a disk-like shape extending radially about the central axis J. As shown in FIG. The fixing portion 51 of the lid portion 5b is arranged on the axial lower side (one axial side) X1 of the fan portion 2b and has a disc shape extending radially about the central axis J. As shown in FIG.

The fixed portion 51 has a fitting hole 511 and an annular rib 512 (see FIG. 7). The fitting hole 511 is arranged on the central axis J and passes through the fixed portion 51 in the axial direction. The annular rib 512 of the lid portion 5 a protrudes axially from the lower surface (one end surface in the axial direction) of the fixing portion 51 and surrounds the fitting hole 511 . The annular rib 512 of the lid portion 5b protrudes in the axial direction from the upper surface (the other end surface in the axial direction) of the fixing portion 51 and surrounds the fitting hole 511 .

By providing the annular rib 512 , the inner surface of the annular rib 512 and the bearing holding portion 223 a are brought into contact with each other when the bearing holding portion 223 a is fitted in the fitting hole 511 . By this. The bearing holding portion 223a can be stably supported.

The fixing portion 51 of the lid portion 5a is formed such that the cross-sectional area orthogonal to the central axis J increases toward the axial lower side (axial one side) X1. As a result, the airflow flowing into the housing portion 4 from the intake port 41 spreads radially outward along the peripheral surface of the fixed portion 51 and flows smoothly. Therefore, the blowing efficiency of the blower 1 can be further improved.

The connecting portions 52 extend radially outward from the fixed portion 51 and are arranged in a plurality in the circumferential direction, and connect the annular portion 53 and the fixed portion 51 . The air flowing inside the housing portion 4 passes between the adjacent connecting portions 52 .

The connecting portion 52 of the lid portion 5b (connecting portion arranged on the lower axial side (one axial side) X1) and the connecting portion 52 of the lid portion 5a (arranged on the upper axial side (other axial side) X2 connecting part) is different in shape. As a result, the shape of the connection portion 52 on the intake side and the shape of the connection portion 52 on the exhaust side are changed, and by making the connection portion 52 function as a stationary blade, the ventilation efficiency in the housing portion 4 can be improved.

The connecting portion 52 of the lid portion 5a is formed so that the cross-sectional area orthogonal to the central axis J increases toward the axial lower side (axial direction one side) X1. As a result, air flowing into the housing portion 4 from the intake port 41 smoothly flows along the connecting portion 52 . Therefore, the blowing efficiency of the blower 1 can be further improved.

Further, the connecting portion 52 of the lid portion 5b is inclined to one side in the circumferential direction toward the axial lower side (one side in the axial direction) X1. As a result, air flowing out of the housing portion 4 from the exhaust port 42 flows smoothly along the connecting portion 52 . Therefore, the blowing efficiency of the blower 1 can be further improved.

In addition, when viewed from the radial direction, the inclination angle with respect to the central axis J of the connecting portion 52 on the upper axial side (the other axial side) X2 is less than the angle of inclination to Accordingly, the airflow flowing into the housing portion 4 from the intake port 41 can be smoothly circulated along the connecting portion 52 . Therefore, the blowing efficiency of the blower 1 can be further improved. The circumferential outer surface of the connecting portion 52 of the lid portion 5a may be formed parallel to the axial direction.

The annular portion 53 is formed in an annular shape, and the outer peripheral surface of the annular portion 53 and the inner peripheral surface of the housing portion 4 are in contact with each other. A through hole 531 is formed through the annular portion 53 in the radial direction. Further, the annular portion 53 has projecting pieces 532 , grooves 533 , holding pieces 534 , holding recesses 535 , projections 536 , engaging recesses 537 and notch holes 538 . The through hole 531, the protruding piece 532, the groove 533, and the engaging recess 537 are arranged in a row in the axial direction.

A set of through-holes 531, protruding pieces 532, grooves 533, and engaging recesses 537 are provided at four locations at equal intervals in the circumferential direction. The protrusions 536 are arranged between the through holes 531 adjacent in the circumferential direction, and are provided at four locations at equal intervals in the circumferential direction. One holding piece 534 and one holding concave portion 535 are provided.

The protruding piece 532 of the lid portion 5a protrudes axially downward X1 from the lower surface of the annular portion 53 . The through hole 531 is arranged adjacent to the projecting piece 532 in the axial direction.

The protruding piece 532 of the lid portion 5b protrudes from the upper surface of the annular portion 53 axially upward in the axial direction X2. That is, the protruding pieces 532 of the lid portions 5a and 5b protrude in the axial direction from the axial end surfaces facing the inner side of the housing portion 4 .

In this embodiment, the through hole 531 is formed across a portion of the projecting piece 532 . Note that the through hole 531 may be formed only in the annular portion 53 without extending over part of the projecting piece 532 . Further, instead of the through hole 531 , a recess that is recessed radially inward from the radial outer surface of the annular portion 53 may be formed.

The projecting piece 532 has an inclined portion 5321 . The inclined portion 5321 of the lid portion 5a is arranged axially lower (closer to the fan portions 2a and 2b in the axial direction) X1 than the through hole 531 on the outer peripheral surface of the projecting piece 532, and axially upper (housing portion 4) tilts radially outward toward X2.

The inclined portion 5321 of the lid portion 5b is arranged axially above (closer to the fan portions 2a and 2b in the axial direction) X2 than the through hole 531 on the outer peripheral surface of the projecting piece 532, and is arranged axially below (housing portion 4) tilts radially outward toward X1.

The groove portion 533 of the lid portion 5a is recessed radially inward from the outer peripheral surface and extends axially at the lower end portion of the projecting piece 532 (the axial end portion facing the inside of the housing portion 4).

The groove portion 533 of the lid portion 5b is recessed radially inward from the outer peripheral surface and extends axially at the upper end portion of the projecting piece 532 (the axial end portion facing the inside of the housing portion 4).

The engaging recess 537 of the lid portion 5a is arranged on the axial upper side of the through hole 531 (the side farther from the fan portions 2a and 2b than the through hole 531 in the axial direction) X2, and radially inward from the outer peripheral surface of the annular portion 53. dent in.

The engaging concave portion 537 of the lid portion 5b is arranged on the axial lower side of the through hole 531 (the side farther from the fan portions 2a and 2b than the through hole 531 in the axial direction) X1, and is radially from the outer peripheral surface of the annular portion 53. concave inward.

The holding piece 534 protrudes radially outward from the outer peripheral surface of the annular portion 53 and extends in the circumferential direction. The holding recessed portion 535 radially faces the holding piece 534 and is recessed radially inward from the outer peripheral surface of the annular portion 53 .

The cutout hole 538 is arranged radially facing the cutout recessed portion 48 and the holding piece 534 of the housing portion 4 which will be described later. The cutout hole 538 of the lid portion 5a is formed by cutting the end surface of the annular portion 53 facing the inside of the housing portion 4 axially upward (axially) X2. The cutout hole 538 of the lid portion 5b is formed by cutting the end face of the annular portion 53 facing the inner side of the housing portion 4 downward in the axial direction (axial direction) X1.

Conducting wires (not shown) connected to the circuit board 23 of the fan portion 2a and conducting wires (not shown) connected to the circuit board 23 of the fan portion 2b are led out of the housing portion 4 through the notch holes 538, respectively. be. Thereby, the conducting wire can be prevented from coming into contact with the impeller 21a or the impeller 21b. In addition, by reducing the number of conductors passing through the inside of the housing portion 4, the airflow inside the housing portion 4 can be circulated more smoothly.

Also, the lead wire is held between the holding piece 534 and the holding recess 535 . Thereby, the conducting wire pulled out to the outside of the housing portion 4 can be held along the outer peripheral surface of the housing portion 4 . Therefore, it becomes easier to route the conductors, and the assembling workability of the blower device 1 is further improved.

<4. Structure of Housing>
The housing portion 4 has an engaging convex portion 44, a guide portion 45, a flange portion 46, a notch portion 47, and a notch concave portion at the lower end portion (one end portion in the axial direction) and the upper end portion (the other end portion in the axial direction). 48 and a stepped portion 49 . The engaging convex portion 44, the guide portion 45, and the notch portion 47 are arranged in a row in the axial direction. A set of engaging protrusions 44 , guide portions 45 and notch portions 47 are provided at four locations at equal intervals in the circumferential direction at the upper end portion and the lower end portion of the housing portion 4 , respectively. The cutout recesses 48 are arranged in the middle of the engaging protrusions 44 adjacent in the circumferential direction, and are provided at four positions at equal intervals in the circumferential direction at the upper end portion and the lower end portion of the housing portion 4 , respectively.

The stepped portions 49 are formed at both ends in the axial direction of the housing portion 4 so that the inner peripheral surfaces thereof are recessed radially outward. The stepped portion 49 axially contacts the annular portion 53 . By providing the stepped portion 49, the inner peripheral surface of the annular portion 53 and the inner peripheral surface of the housing portion 4 are formed flush with each other. Thereby, the airflow inside the housing portion 4 can be more smoothly circulated.

The engaging protrusions 44 protrude radially inward from the inner peripheral surfaces of both ends of the housing portion 4 in the axial direction. The engaging convex portion 44 engages with the periphery of the through hole 531 of the lid portion 5 a at the upper end portion of the housing portion 4 . The engaging protrusion 44 engages with the circumference of the through hole 531 of the lid portion 5b at the lower end portion of the housing portion 4. As shown in FIG.

The guide portion 45 is arranged at the axially outer end portion. The guide portion 45 is arranged axially above (axially outside) X2 relative to the engaging convex portion 44 at the upper end portion (the other axial end portion) of the housing portion 4 . The guide portion 45 is arranged axially lower (axially outward) X1 than the engagement convex portion 44 at the lower end (one axial end) of the housing portion 4 . The guide portion 45 protrudes radially inward from the inner peripheral surface of the housing portion 4 and extends in the axial direction.

The notch 47 is arranged axially lower (axially inward) X1 than the engaging projection 44 at the upper end (the other end in the axial direction) of the housing portion 4, and the stepped portion 49 is axially lower. (Axial inner side) It is formed recessed at X1. The notch 47 is arranged axially above (axially inwardly) X2 the engaging projection 44 at the lower end (one axial end) of the housing portion 4, and the stepped portion 49 is axially above ( Axial inner side) X2 is recessed.

The flange portion 46 protrudes radially outward from the axially outer end portion of the housing portion 4 and has a mounting hole 461 extending in the axial direction. The blower device 1 is screwed to other equipment through the mounting holes 461 . The flange portions 46 face the engaging protrusions 44 in the radial direction, and are provided at four locations on the upper end portion and the lower end portion of the housing portion 4, respectively. The engaging convex portion 44 and the guide portion 45 are radially adjacent to the mounting hole 461 . Thereby, the periphery of the mounting hole 461 can be formed thick.

Four notch recesses 48 are provided at the upper end portion and the lower end portion of the housing portion 4, respectively. The notch recess 48 is formed by cutting the upper end surface of the housing portion 4 from the axial upper end surface (the other axial end surface) to the axial lower side (axial one side) X1. The notch recess 48 is formed by cutting the lower end surface of the housing portion 4 from the axial lower end surface (axial one end surface) to the axial upper side (axial other side) X2.

<5. Connection Structure Between Housing and Lid>
FIG. 8 is a perspective view showing an enlarged part of the upper end portion of the blower device 1. As shown in FIG. The lid portion 5a is attached to the housing portion 4 with the fan portion 2a fixed. At this time, the groove portion 533 of the protruding piece 532 is brought into contact with the guide portion 45, and the cover portion 5a is inserted to the axial lower side (axial direction one side) X1.

The lid portion 5b is attached to the housing portion 4 with the fan portion 2b fixed. At this time, the groove portion 533 of the protruding piece 532 is brought into contact with the guide portion 45, and the cover portion 5a is inserted to the upper side in the axial direction (the other side in the axial direction) X2.

At this time, the guide portion 45 slides along the groove portion 533 . This facilitates the positioning of the lid portions 5a and 5b in the circumferential direction, and allows the lid portions 5a and 5b to be smoothly inserted axially inward.

When the engaging convex portion 44 contacts the inclined portion 5321, the protruding piece 532 is bent radially inward. It is inserted into the through hole 531 . As a result, the engaging convex portion 44 engages with the periphery of the through hole 531, and the projecting piece 532 presses the inner peripheral surface of the housing portion 4 radially outward. Thereby, the lid portions 5 a and 5 b are firmly fixed to the housing portion 4 . Therefore, the workability of assembling the lid portions 5a, 5b and the housing portion 4 can be improved.

At this time, providing the inclined portion 5321 makes it easier to move the projecting piece 532 along the guide portion 45 . Therefore, the workability of assembling the lid portion 5a and the housing portion 4 can be further improved.

Further, the protruding piece 532 is fitted into the notch portion 47 when the engaging convex portion 44 is engaged with the periphery of the through hole 531 . Also, the protrusion 536 fits into the notch recess 48 . Also, the guide portion 45 fits into the engaging recess 537 . Also, the annular portion 53 contacts the stepped portion 49 in the axial direction. In addition, a plurality of pairs of engaging through holes 531 and engaging protrusions 44 are arranged at approximately equal intervals in the circumferential direction. Thereby, the housing portion 4 and the lid portion 5a are more firmly fixed in the axial direction and the circumferential direction.

A gap may be partially formed between the outer peripheral surface of the annular portion 53 and the inner peripheral surface of the housing portion 4 . As a result, vibration transmitted from the lid portions 5a and 5b to the housing portion 4 can be reduced.

<5. Others>
Although the embodiment of the present invention has been described above, the scope of the present invention is not limited to this, and various modifications can be made without departing from the gist of the invention. In addition, the above-described embodiment and its modifications can be appropriately combined arbitrarily.

In this embodiment, the set of through-holes 531, projecting pieces 532, grooves 533 and engaging recesses 537, and the set of engaging projections 44, guides 45 and notches 47 are equally spaced in the circumferential direction. Although each is provided at four locations, it may be provided at two locations, three locations, or five locations or more.

Further, the engaging projection 44 and the guide portion 45 are arranged adjacent to the mounting hole 461 in the radial direction, but the engaging projection 44 and the guide portion 45 are arranged at positions different from the mounting hole 461 in the circumferential direction. You may Also, the engaging convex portion 44 may be arranged at a position different from that of the guide portion 45 in the circumferential direction.

Further, the housing portion 4 may be formed so that the diameter decreases toward the axial lower side (the one axial side). As a result, the airflow inside the housing portion 4 can be smoothly circulated toward the exhaust side.

INDUSTRIAL APPLICABILITY The present invention can be used, for example, in a cooling device provided with a blower.

Reference Signs List 1 air blower 2a, 2b fan portion 4 housing portion 5a, 5b lid portion 21a, 21b impeller 22 motor 23 circuit board 41 intake port 42 exhaust port 44 engaging projection portion 45 guide portion 46 flange portion 47 notch portion 48 notch recess portion 49 step Part 51 Fixed part 52 Connecting part 53 Annular part 211a, 211b Impeller cup 212a, 212b Blade 221 Shaft 222 Bearing 223 Stator 223a Bearing holder 223b Stator core 223c Insulator 224 Rotor 224a Rotor yoke 224b Magnet 461 Mounting hole 51 1 fitting hole 512 annular rib 531 Through hole 532 Protruding piece 533 Groove 534 Holding piece 535 Holding recess 536 Projection 537 Engagement recess 2111a, 2111b Impeller lid 2112a, 2112b Impeller cylinder 2113a, 2113b Impeller projection 5321 Inclined portion J Center axis X1 Axial lower side ( one side in the axial direction)
X2 Axial upper side (axial other side)

Claims (13)

a pair of coaxially arranged fan units that generate an airflow on one side in the axial direction along the central axis;
a housing portion formed in a cylindrical shape extending along the central axis, housing the pair of fan portions, and having both axial end faces open;
a lid portion that covers and ventilates the one axial end surface and the other axial end surface of the housing portion,
The pair of fan parts are
Having a motor that is fixed to each of the lids and rotates the impeller,
The impeller is
an impeller tube portion arranged radially outward of the motor and extending in the axial direction;
an impeller lid portion covering an axial end surface of the impeller tubular portion on the side opposite to the lid portion in the axial direction to which the motor is fixed;
a plurality of blade portions arranged in the circumferential direction on the radial outer surface of the impeller cylinder portion,
The pair of fan portions is an air blower, wherein the impeller lid portions are directly opposed to each other in the axial direction. 2. The blower device according to claim 1, wherein said impeller lid portion is arranged parallel to a plane perpendicular to said central axis. 3. The blower device according to claim 1, wherein at least one of the opposing impeller lid portions has an impeller protrusion portion axially protruding from a radially outer end portion. 4. The blower device according to claim 3, wherein the impeller projections extend parallel to the axial direction. The blower device according to any one of claims 1 to 4, wherein the pair of fan portions have the same outer diameter of the impeller cylinder portion. The inclination angle of the blades with respect to the central axis when the impeller arranged on the other side in the axial direction is expanded in the circumferential direction is the same as that when the impeller arranged on the one side in the axial direction is expanded in the circumferential direction. The blower device according to any one of claims 1 to 5, wherein the angle of inclination of the blade portion with respect to the central axis is smaller. The lid is
an annular portion that contacts the inner peripheral surface of the housing portion;
a fixing portion arranged radially inside the annular portion to which the fan portion is fixed;
a connecting portion that extends radially outward from the fixed portion and is arranged in a plurality in the circumferential direction and connects the annular portion and the fixed portion;
The blower device according to any one of claims 1 to 6, wherein the connecting portion arranged on one side in the axial direction and the connecting portion arranged on the other side in the axial direction have different shapes. When viewed from the radial direction, the connecting portion arranged on the other side in the axial direction has an inclination angle with respect to the central axis that is smaller than the inclination angle with respect to the central axis of the connecting portion arranged on one side in the axial direction. The air blower according to claim 7. The blower device according to claim 7 or 8, wherein the connecting portion arranged on the other side in the axial direction has a cross-sectional area perpendicular to the central axis that increases toward the one side in the axial direction. 9. The blower device according to claim 7, wherein a circumferential outer surface of said connecting portion arranged on the other side in the axial direction is formed parallel to the axial direction. 11. The blower device according to claim 10, wherein said fixing portion of said lid portion arranged on the other side in the axial direction has a cross-sectional area perpendicular to said central axis that increases toward the one side in the axial direction. . The fixed part is
a fitting hole arranged on the central axis and penetrating in the axial direction;
an annular rib that surrounds the fitting hole and protrudes in the axial direction;
The fan section has a cylindrical bearing holding section that internally holds a bearing that rotatably supports a shaft extending along the central axis,
The blower device according to any one of claims 7 to 11, wherein an axially outer end portion of said bearing holding portion is fitted in said fitting hole. The blower device according to any one of claims 1 to 12, wherein the housing has a diameter that decreases toward one side in the axial direction.

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