JP2019090344A - Blower device - Google Patents

Abstract

To provide a silent blower device capable of securing air volume characteristics while suppressing fluid sound even when a sufficient space cannot be ensured near the lateral face.SOLUTION: A blower device 100 includes a housing 200 and a lower side casing 304 constituting a structure in which an impeller 301 as part of a centrifugal fan is stored. An intake port 101 and an exhaust port 102 are provided opening in a direction perpendicular to the rotation axis of the impeller 301. The impeller 301 is located between the intake port 101 and the exhaust port 102. Inside the intake port 101 at its portion adjacent to the impeller 301 inside an upper side housing 201, a bend part is provided.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a blower apparatus, and more particularly to a blower apparatus using a centrifugal fan.

  Blower devices using centrifugal fans are widely used for cooling, ventilation, air conditioning for home appliances, office automation equipment, industrial equipment, air conditioning for vehicles, air flow, and the like. There is also known a blower apparatus using a centrifugal fan as a cooling means of a battery mounted on a hybrid car or an electric car (see, for example, Patent Document 1).

  The cooling blower 10 described in Patent Document 1 is disposed adjacent to the side surface of the battery pack 100. By driving the blower motor of the motor unit 14 and rotating the blower fan 12 having a plurality of blades, air is sucked into the blower fan 12 from the air inlet 18 and is fed as the blower fan 12 rotates. The pumped air is guided along the inner peripheral wall of the case 16 to the spout of the case 16. Then, the battery pack 100 is supplied to the battery pack 100 via a duct connected to the spout, and the battery cells disposed in the battery pack 100 are cooled.

JP, 2016-107703, A

  However, in Patent Document 1, the cooling blower 10 disposed adjacent to the side surface of the battery pack 100 has the intake port 18 located on the side surface of the cooling blower 10. In other words, the intake port 18 is positioned in the direction orthogonal to the direction in which the battery pack 100 is supplied.

  By the way, depending on the condition where the cooling blower 10 is disposed, other devices and components may be disposed in proximity to the space in the vicinity of the intake port 18. In such a case, the air is not sufficiently sucked into the blower fan 12 from the intake port 18, and the required air flow characteristic can not be obtained. As a result, the ability to cool the battery cells of the battery pack 100 is reduced.

  With such background, the present invention has an object to provide a quiet blower apparatus capable of securing an air volume characteristic and suppressing a fluid sound even when a sufficient space can not be secured near the side surface.

  The present invention has a structure in which an impeller constituting a centrifugal fan is housed, and the structure is provided with an air inlet and an air outlet opened in a direction orthogonal to the rotation axis of the impeller, and the air suction The said impeller is located between the opening and the said exhaust port, and it is a blower apparatus by which the curved part is provided in the part which adjoins the said impeller inside the said structure inside the said inlet.

  In the present invention, the curved portion may include an arc portion. In the present invention, the curved portion includes an aspect including the arc portion and an R surface. In the present invention, the curved portion may be projected in the direction of the back of the air inlet.

  In this invention, the aspect by which the inclination part is provided in the tip of the said curved part seeing from the said inlet port is mentioned. In this aspect, a casing containing the impeller is accommodated inside the structure, and the casing is provided with a suction port opened in the direction of the rotation axis, and the inclined portion is formed in the curved portion. The aspect which inclines toward the direction of the said suction port as it approaches is mentioned.

  According to the present invention, even when sufficient space can not be secured in the vicinity of the side surface, the air volume characteristic can be secured, and furthermore, a quiet blower apparatus in which fluid noise is suppressed can be obtained.

It is a perspective view of a blower device of an embodiment using the present invention. It is a disassembled perspective view of the blower apparatus shown in FIG. It is a perspective view for demonstrating the circular arc part formed in the upper housing. It is explanatory drawing for demonstrating the circular arc part formed in the upper housing. It is sectional drawing of the blower apparatus shown in FIG. FIG. 2 is a perspective view of an impeller assembly. FIG. 6 is an exploded perspective view of the impeller assembly shown in FIG. 5;

(Outline) (see Figures 1 to 3)
The blower apparatus 100 has a housing 200 and a lower casing 304 which constitute a structural body in which an impeller 301 constituting a centrifugal fan is housed. In this structure, an intake port 101 and an exhaust port 102 opened in a direction orthogonal to the rotation axis of the impeller 301 are provided. The impeller 301 is located between the intake port 101 and the exhaust port 102. A curved portion including an arc portion 212 and an R surface 211 a is provided in a portion close to the impeller 301 inside the upper housing 201 inside the air inlet 101.

(Configuration) (see FIGS. 1 to 3)
A blower apparatus 100 is shown in FIGS. 1 and 2. The blower apparatus 100 sucks in fluid (in this case, air) from the air inlet 101 and exhausts the air from the air outlet 102 in accordance with the rotation of the impeller 301 constituting the centrifugal fan.

  The blower apparatus 100 has a housing 200 in which a blower is housed. The blower includes an impeller 301 having a large number of blades in the circumferential direction, a spiral casing 302 for housing the impeller 301, and a motor assembly (described behind the impeller 301 in FIG. 3) for rotating the impeller 301. It is composed of

  The housing 200 is configured of an upper housing 201 that covers one side in the axial direction of the impeller 301 and a lower housing 202 that covers the other side. An intake port 101 and an exhaust port 102 are provided in the housing 200 (201, 202). The intake port 101 and the exhaust port 102 are directed in a direction orthogonal to the axial direction (the direction of the rotation axis of the impeller 301), and the openings are directed in opposite directions (directions different by 180 °). The upper housing 201 and the lower housing 202 are formed by resin molding.

  As shown in FIG. 2, the upper casing 303 is covered by the upper housing 201. The bonding between the upper housing 201 and the upper casing 303 is formed by forming a step on the joint surface of each other, and by combining the steps. Similarly, in the bonding of the upper housing 201 and the lower housing 202, a step is formed on the joint surfaces of the upper housing 201 and the lower housing 202, and these steps are combined.

  The casing 302 is composed of an upper casing 303 and a lower casing 304 formed by resin molding, and an axial end face of the upper casing 303 is formed with an opening serving as a suction port 309. The lower casing 304 is integrally molded with the lower housing 202 by resin molding, and the lower casing 304 and the lower housing 202 are formed of one member. The upper casing 303 and the lower casing 304 have a recess and a protrusion respectively formed on the mating surfaces, and by fitting the protrusion and the recess, the upper casing 303 and the lower casing 304 are connected. The casing 302 is obtained.

  At the upper casing 303, one fixing attachment leg 305 is formed, and at the lower casing 304, two fixing attachment legs 306 are integrally formed. A bolt is inserted into a through hole formed in each mounting leg, and the blower device 100 is fixed to a mounting base, a housing or the like by the bolt.

  An impeller 301 is accommodated in the spiral casing 302. The impeller 301 is provided with a large number of forward facing blades in the circumferential direction. The impeller 301 rotates counterclockwise as viewed from the point of view in FIG. 3, whereby air is drawn in the clearance 308 provided between the inner peripheral surface (inner peripheral wall) of the casing 302 and the outer peripheral edge of the impeller 301. The pressure is fed in the counterclockwise direction of 3 and air is blown out from the exhaust port 102.

  The inner circumferential surface (inner circumferential wall) of the casing 302 forming the gap 308 follows an involute curve, and the gap 308 has a structure in which the cross-sectional area increases along the flow of the air blown out from the impeller 301 and pumped. There is. A tongue portion 205 is provided at a portion adjacent to the exhaust port 102 on the inner peripheral surface of the casing 302. The curved surface of the inner circumferential surface of the casing 302 is formed by an involute curve starting from the tongue portion 205.

  The exhaust port 102 is formed by a U-shaped notch portion provided in the upper casing 303 and the lower casing 304, and is formed to open in a direction orthogonal to the rotation axis.

  As shown in FIG. 2, the lower casing 304 is formed integrally with the lower housing 202, and is formed of one member. This is because they can be easily integrally molded with upper and lower molds (upper and lower molds). On the other hand, the upper casing 303 is formed of a separate member from the upper housing 201. This is because it is necessary to form the suction port 309 in the upper casing 303, so the mold becomes complicated and expensive to obtain by integral molding.

(Structure of motor assembly)
An impeller assembly 500 is shown in FIGS. 6 and 7. The impeller assembly 500 is composed of an impeller 301 and a motor assembly 400 that drives the impeller 301. The motor assembly 400 is disposed behind the impeller 301 in FIG. The motor assembly 400 is an inner rotor type motor in which a rotor rotates inside a stator. The motor assembly 400 includes a resin motor housing 403, a metal bracket 410, a stator 420, a rotor 430, and a circuit board 402.

  The stator 420 has a substantially annular shape, and includes a stator core 421, an insulator 422, and a coil 423. The stator core 421 is configured by laminating a predetermined number of soft magnetic steel plates, and includes a plurality of salient poles extending radially inward. In the stator core 421, resin insulators 422 are attached from both axial sides, and a coil 423 is wound around the salient pole extending radially inward via the insulator 422.

  The stator 420 is fixed to a metal bracket 410. The bracket 410 includes a cylindrical portion 411 and a flange portion 412. The flange portion 412 has a shape extending radially outward from one end of the cylindrical portion 411. The stator 420 is fixed to the inside of the cylindrical portion 411. The bracket 410 to which the stator 420 is fixed is mounted on a resin motor housing 403.

  The rotor 430 is rotatably disposed inside the stator 420. The rotor 430 includes a metal shaft 431, a metal sleeve 432, and a hollow cylindrical magnet (rotor magnet) 433. The sleeve 432 has a cylindrical portion and a disc portion, the magnet 433 is fixed to the outer periphery of the cylindrical portion, and the shaft 431 is fixed to the center of the disc portion (see FIG. 5). The shaft 431 is rotatably held by the motor housing 403 via bearings 404 and 405 (see FIG. 5).

  A circuit board 402 is disposed on the back of the bracket 410. The circuit board 402 is attached to the motor housing 403 with a screw or the like.

(Structure of impeller)
An impeller 301 is shown in FIG. The impeller 301 is an integrally molded product made of resin, and extends in the axial direction from the substantially conical hub 321 and the hub 321, and has a plurality of blades 323 for blowing out air in the centrifugal direction, and upper portions of the blades 323. It has the connection part 322 which connects an edge. As shown in FIG. 5, the impeller 301 is fixed to the shaft 431, and when the shaft 431 rotates, the impeller 301 rotates integrally with the shaft 431.

(Assembly process)
Hereinafter, an example of the assembly process of the blower apparatus 100 is demonstrated. First, the motor assembly 400 shown in FIGS. The motor assembly 400 is manufactured as follows. First, the stator 420 is fixed to the inside of the bracket 410. On the other hand, the rotor 430 is attached to the motor housing 403 via bearings 404 and 405 (see FIG. 5). Then, the bracket 410 holding the stator 420 is fixed to the motor housing 403, and the circuit board 402 is further fixed to the motor housing 403. Thus, the motor assembly 400 is obtained.

  After the motor assembly 400 is obtained, the impeller 301 is mounted on the shaft 431 protruding from the motor housing 403, and the impeller 301 is fixed to the shaft 431 by the stop washer 324. Thus, an impeller assembly 500 shown in FIG. 6 is obtained.

  Next, the impeller assembly 500 is mounted to the lower casing 304 (see FIG. 2). At this time, the portion of the motor assembly 400 of the impeller assembly 500 is inserted into the opening formed in the lower casing 304 from the inside of the lower casing 304, and the portion of the motor housing 403 is screwed to the lower casing 304. Fix it. Thereafter, the motor cover 406 (see FIG. 5) covering the back of the printed circuit board 402 is fixed to the lower casing 304 (lower housing 202) with a screw or the like.

  The impeller assembly 500 shown in FIG. 6 can be attached to the lower casing 304 with the impeller 301 attached. Therefore, in a state where the impeller 301 is attached to the motor assembly 400 in advance, the unbalance of the impeller 301 can be adjusted, and the impeller 301 with suppressed vibration can be incorporated in the lower casing 304.

(Characteristic structure)
The air drawn in from the air inlet 101 of the housing 200 along with the rotation of the impeller 301 is directed along the inner peripheral wall continuing from the air inlet 101 of the housing 200, and a swirling flow (a swirling flow in the clockwise direction when viewed from the viewpoint of FIG. 3) The air is drawn into the suction port 309 of the upper casing 303 while forming the Although the gap between the inner circumferential wall continuing from the air inlet 101 of the housing 200 and the casing 302 gradually decreases, the gap is minimized and the sloped portion 206 is provided in the closing region so as not to create a closing point. .

  The inclined portion 206 is provided in the inner part of the lower housing 202 at the back of the intake port 101. The inclined portion 206 has an inclined surface that changes the flow of air flowing in from the inlet 101 in the axial direction (the direction from the lower housing 202 toward the upper housing 201). The air drawn in from the air inlet 101 travels straight along the inner peripheral wall of the lower housing 202, and then strikes the inclined portion 206, where the direction is changed to the upper housing 201 and guided to the air inlet 309 of the upper casing 303. Be done.

  If there is no inclined portion 206, the air entering from the intake port 101 travels through the gap between the lower housing 202 and the lower casing 304, which gradually narrows, but eventually reaches the closing point. Air entering from 101 loses a place to go and receives great resistance. The closed portion is a dead area where there is no destination for the air flow, which blocks the air flow. For this reason, if the inclined portion 206 does not exist, the efficiency of the blower device 100 is reduced.

  On the other hand, if the inclined portion 206 is present, the air hitting the inclined portion 206 is rectified in the direction of the upper housing 201, so that the generation of the above-mentioned dead area is suppressed. Therefore, the efficiency as a blower apparatus becomes high compared with the case where the inclination part 206 is not provided.

  A circular arc portion 212 is formed in the vicinity of the intake port 101 of the inner peripheral wall 211 of the upper housing 201 shown in FIG. 3. The arc portion 212 is provided at a corner portion directed from the air intake port 101 to the inside (inside) of the upper housing 201.

  The arc portion 212 protrudes in the inside of the upper housing 201 (in the direction of the back of the intake port 101 (the direction of the intake port 309)), and has an overhanging structure as viewed from the inside of the housing 200. The tip of the arc portion 212 viewed from the air intake port 101 is an inclined wall 211 b via the R surface 211 a curved downward. In this example, a curved portion is formed by the arc portion 212 and the R surface 211 a.

  The inclined wall 211b is inclined in a direction away from the suction port 309 as it is separated from the suction port 101, and its tip (bottom) is a vertical wall 211c. From another point of view, the inclined wall 211b extends from the vertical wall 211c toward the R surface 211a, and the inclined wall 211b has an inclined shape that approaches the suction port 309 as it approaches the R surface 211a (curved portion) ing. The cross-sectional shape of the inclined wall 211b seen from the viewpoint of FIG. 3 may be a linear shape, a shape connecting a plurality of straight lines, a curved surface shape, or a shape combining a plurality of these shapes.

  The arc portion 212 will be described below with reference to FIG. The arc portion 212 has a center O on an axis passing on the inner circumferential wall B of the upper housing 201 (on the vertical wall 211c in FIG. 3), and a circle E passing through the inner circumferential wall D of the inlet 101 of the upper housing 201. It is formed by a circular arc F. The center O of the circle E is a point at which an arc C in contact with the apex A of the outer circumferential circle of the impeller 301 and the wall surface B of the vertical wall 211 c contacts the vertical wall 211 c. Further, an R surface 211a having a predetermined curvature radius is formed between the arc portion 212 and the inclined wall 211b (see FIG. 3).

  Due to the structure from the arc portion 212 → the R surface 211 a → the inclined wall 211 b → the vertical wall 211 c, the air sucked from the air intake port 101 produces an effective swirling flow (flow of clockwise swirling seen from the viewpoint of FIG. 3). , Sucked into the suction port 309 of the upper casing 303.

  In the case where there is no arc portion 212 and the structure directly connected to the vertical wall 211c from the intake port 101, the inflow direction of the air in the intake port 101 and the vertical wall 211c intersect at a right angle. As a swirling flow, a part of the air sucked into the suction port 309 is diverted near the upper portion of the vertical wall 211c, causing local vortices to cause noise. In addition, the area where the local vortices occur forms a dead water area, and energy of the flow of air from the inlet 101 to the inlet 309 is consumed in the portion of the vortex, so the inlet 101 → the inlet 309 The air volume characteristic when considering the flow of air at the exhaust port 102 is degraded. Further, the swirling flow collides with the vertical wall 211 c extending to the air inlet 101, and a part of the flow is diverted to the air inlet 101. This flow interferes with the flow of the air flowing in from the air inlet 101, which also forms vortices and causes noise.

  In the present embodiment, by providing the arc portion 212, the R surface 211a, and the inclined wall 211b, it is possible to prevent the swirling flow from being divided at the upper portion of the vertical wall 211c, and a situation where wasteful energy consumption is less likely to occur. Further, since the vertical wall 211c → the inclined wall 211b → the R surface 211a is formed along the flow of the swirling flow, the flow of the swirling flow is less likely to be disturbed, and the reduction in efficiency and the generation of noise can be suppressed.

  That is, the air taken in from the intake port 101 becomes a swirling flow that turns clockwise (right turn) when viewed from the left side of FIG. 2 (or viewed from the viewpoint of FIG. 3). It is drawn in and exhausted by the action of the impeller 301. At this time, in the case where there is no arc portion 212 as assumed above and the structure is connected directly to the vertical wall 211c from the intake port 101, loss occurs due to separation of swirling flow or collision with main flow, and efficiency as a blower device decreases. And noise is generated. In the present embodiment, by providing the arc portion 212, the R surface 211a, and the inclined wall 211b, the air flow is rectified so as to avoid separation of the swirl flow and collision with the main flow. For this reason, elements that inhibit the formation of the swirling flow are eliminated, and a blower device having high efficiency and low noise can be obtained.

  Further, as shown in FIGS. 1 and 2, in the blower device 100, the housing 200 is configured to cover the position excluding the tongue portion 205 located in the vicinity of the exhaust port 102 of the casing 302. Further, the suction port 309 is not circular, and a part of the side where the tongue portion 205 is present is closed, and the distance between the suction port 309 and the tongue portion 205 is secured when viewed from the viewpoint of FIG.

  The clearance 308 between the inner peripheral surface (inner peripheral wall) of the casing 302 and the outer peripheral edge of the impeller 301 is gradually increased from the tongue portion 205 toward the exhaust port 102 (counterclockwise as viewed from the left in FIG. 2) And the flow path to the exhaust port 102 is long. For this reason, the static pressure at the exhaust port 102 becomes high. The static pressure is maximum near the tongue 205 near the exhaust port 102.

  In the portion where the static pressure is maximum, the clearance 308 between the inner peripheral surface (inner peripheral wall) of the casing 302 and the outer peripheral edge of the impeller 301 is minimum, so from this portion through the space between the blades of the impeller 301 Backflow occurs in the suction port 309 of the upper casing 303. When this backflow occurs, the backflow component collides with the air flowing into the suction port 309, resulting in deterioration in P-Q performance and noise.

  On the other hand, in the present embodiment, the gap 308 between the inner peripheral surface (inner peripheral wall of the casing 302) and the outer peripheral edge of the impeller 301 is minimized when the housing 200 excludes the tongue portion 205 of the casing 302 (Position), the air guided to the suction port 309 of the upper casing 303 does not flow directly into the portion of the tongue portion 205 (the position where the gap 308 is minimized), but flows into the suction port 309 described above. Collision of air with air flowing backward is prevented. As a result, the reduction of P-Q performance and the generation of noise are suppressed.

  Further, the housing 200 is at a position where it does not overlap with the fixing attachment legs 305 and 306 together with the position excluding the tongue portion 205 of the casing 302. Therefore, when the bolt is inserted into the through holes of the fixing mounting legs 305 and 306 and the blower device 100 is fixed to the mounting base or the casing by the bolt, the tool does not interfere with the housing 200 and the mounting operation becomes easy. .

(Others)
The dimensions of the suction port 101 formed in the housing 200, the height from the suction port 309 of the upper casing 303 to the upper housing 201, the suction port 309 of the upper casing 303, the exhaust port 102, etc. depend on the required air volume characteristics. Determined as appropriate.

(effect)
By joining the upper housing 201 and the lower housing 202, the intake port 101 and the exhaust port 102 are formed in the direction orthogonal to the rotation axis of the impeller 301. The intake port 101 is in a positional relationship with the exhaust port 102 in the opposite direction (180 °). As a result, even when there is not a sufficient space in the vicinity of the side surface of the blower apparatus 100, the blower apparatus 100 can be obtained that can ensure air volume characteristics and can blow air.

  The air drawn from the air inlet 101 of the housing 200 with the rotation of the impeller 301 is guided to the air inlet 309 of the upper casing 303 along the inner peripheral wall continuing from the air inlet 101 of the housing 200. At this time, the flow of air is smoothly guided by the inclined portion 206 to the suction port 309 of the upper casing.

  A circular arc portion 212 is formed in the vicinity of the intake port 101 of the upper housing 201 in the same manner as the tongue portion 205 located in the vicinity of the exhaust port 102 of the casing 302. The air flowing in from the intake port 101 along the arc shape of the arc portion 212 is smoothly guided to the intake port 309 of the spiral casing 302. As a result, the generation of loss and noise due to the generation of an unintended vortex in the air sucked into the suction port 309 from the suction port 101 is prevented.

  Since the housing 200 is configured to cover the position excluding the tongue portion 205 located in the vicinity of the exhaust port 102 of the casing 302, the air that flows back from the suction port 309 and collides with the air flowing into the suction port 309 , P-Q performance degradation and noise are prevented.

DESCRIPTION OF SYMBOLS 100 ... Blower apparatus, 101 ... Intake port, 102 ... Exhaust port, 200 ... Housing, 201 ... Upper housing, 202 ... Lower housing, 205 ... Tongue part, 206 ... Slope part, 211 ... Inner peripheral wall, 211a ... R surface, 211b ... inclined wall, 211c ... vertical wall, 212 ... arc part, 301 ... impeller, 302 ... casing, 303 ... upper casing, 304 ... lower casing, 305 ... mounting leg for fixing, 306 ... mounting leg for fixing, 308 ... Clearance, 309, suction port, 400, motor assembly, 402, circuit board, 403, motor housing, 404, bearing, 405, bearing, 406, motor cover, 410, bracket, 411, cylindrical portion, 412, flange portion, 420 ... stator, 421 ... stator core, 422 ... insulator, 423 ... coil, 430 ... rotor.

Claims (6)

Has a structure in which an impeller constituting a centrifugal fan is housed,
The structure is provided with an air inlet and an air outlet opening in a direction orthogonal to the rotation axis of the impeller,
The impeller is located between the air inlet and the air outlet,
The blower apparatus provided with the curved part in the part close to the said impeller of the inner side of the said structure in the said inlet.   The blower apparatus according to claim 1, wherein the curved portion includes an arc portion.   The blower apparatus according to claim 2, wherein the curved portion includes the arc portion and an R surface.   The blower apparatus according to any one of claims 1 to 3, wherein the curved portion protrudes in a direction toward the back of the intake port.   The blower device according to claim 1, wherein an inclined portion is provided at an end of the curved portion when viewed from the air intake port. Inside the structure, a casing containing the impeller is accommodated;
The casing is formed with a suction port opened in the direction of the rotation axis,
The blower apparatus according to claim 5, wherein the inclined portion is inclined toward the suction port as the curved portion is approached.

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