JP2019085985A - Blower device - Google Patents

Abstract

To provide a blower device capable of securing air volume characteristics even when there is no sufficient space kept near a suction port formed in the lateral face.SOLUTION: A blower device 100 includes an impeller 301 including a plurality of vanes for blowing out fluid in the centrifugal direction, and an intake port 101 and an exhaust port 102 located across the impeller 301 in view from the axial direction for taking in air from the direction perpendicular to the axial direction and exhausting air in the direction perpendicular to the axial direction, respectively.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 in home appliances, office automation equipment, cooling of industrial equipment, ventilation, air conditioning, air conditioning for vehicles, air blowing, 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. Depending on the situation where the cooling blower 10 is disposed, other devices and components may be disposed in proximity to the space near 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.

  In such a background, the present invention has an object to provide a blower device capable of securing an air volume characteristic even when a sufficient space can not be secured in the vicinity of a suction port formed on a side surface.

  According to the present invention, there is provided an impeller having a plurality of blades for blowing out fluid in a centrifugal direction, and an inlet and an axial direction which are located at a position sandwiching the impeller when viewed from the axial direction, and intake air from a direction orthogonal to the axial direction. It is a blower apparatus provided with the exhaust port which exhausts in the direction to orthogonally cross.

  As an aspect of the present invention, a housing having the intake port and the exhaust port formed therein is provided, and a casing that rotatably accommodates the impeller is disposed inside the housing, and an axial end face of the casing is disposed. Is provided with a suction port for sucking in the air taken in at the suction port, and the suction of the flow of air sucked from the direction perpendicular to the axial direction at the suction port is provided at the back of the suction port of the housing. The aspect provided with the inclination part which leads in the direction of a mouth is mentioned.

  As an aspect of the present invention, a gap is provided between the impeller and the casing, and the gap has the smallest gap dimension at a first portion adjacent to the exhaust port, and the gap is smaller than the first portion. The gap size gradually increases along the flow direction of the fluid ejected from the impeller, and the space in front of the suction port on the inside of the housing receives a flow of air sucked from the suction port. There is provided an aspect in which a wall portion is provided and viewed from the axial direction, the wall portion is disposed between the suction port and the first portion.

  Another aspect of the present invention is an impeller having a plurality of blades for blowing out fluid in the radial outer direction, an inlet for taking in air from a direction orthogonal to the axial direction, and an exhaust for discharging air in the direction orthogonal to the axial direction; A housing having the air inlet and the air outlet is formed, and a casing for rotatably accommodating the impeller is disposed inside the housing, and an axial end face of the casing is provided with the air intake. There is a suction port for sucking in the air taken in at the mouth, a gap is provided between the impeller and the casing, and the gap has the smallest gap dimension at the first portion adjacent to the exhaust port. The gap size gradually increases along the flow direction of the fluid ejected from the impeller from the first portion; Is provided with a wall to which the flow of air drawn from the air inlet is applied, and viewed from the axial direction, the wall is a blower disposed between the rotation center of the impeller and the first portion It is an apparatus.

  According to an aspect of the present invention, as viewed from the axial direction, a distance L1 between the wall and an edge of the suction port is smaller than a distance L2 between the wall and the first portion Can be mentioned. As an aspect of the present invention, the casing is constituted by an upper casing and a lower casing, the housing is constituted by an upper housing and a lower housing, and the lower casing and the lower housing are constituted by one member. Are included.

  According to the present invention, it is possible to obtain a blower device capable of securing the air volume characteristics even when a sufficient space can not be secured near the suction port formed on the side surface.

1 is a perspective view of a blower device according to Embodiment 1. FIG. It is a disassembled perspective view of the blower apparatus shown in FIG. It is a figure which shows the planar view in the state which removed the upper housing and upper case in FIG. FIG. 7 is a perspective view of a blower device according to a second embodiment. It is a disassembled perspective view of the blower apparatus shown in FIG. It is a figure which shows the planar view in the state which removed the upper housing in the blower apparatus shown in FIG. It is sectional drawing of the blower apparatus shown in FIG. FIG. 5 is a perspective view of an impeller assembly mounted on the blower apparatus of FIGS. 1 and 4; FIG. 9 is an exploded perspective view of the impeller assembly shown in FIG. 8;

1. Embodiment 1 (see FIGS. 1 to 3)
The blower apparatus 100 is shown by FIGS. 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 includes a housing 200 forming an outer casing, and a blower 300 housed inside the housing 200. The housing 200 is configured of an upper housing 201 that covers one side in the axial direction of the blower 300 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 the direction orthogonal to the axial direction (the direction of the rotation axis of the impeller 301). 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 adjusting the steps. Similarly, in the bonding of the upper housing 201 and the lower housing 202, a step is formed on the joint surface of each other, and the steps are combined.

  A housing 200 is formed by joining the upper housing 201 and the lower housing 202, and the housing 200 is formed with an intake port 101 in a direction orthogonal to the rotation axis. The intake port 101 is in a positional relationship in the opposite direction (180 °) with respect to the exhaust port 102 and the rotational axis.

  The blower 300 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 (behind the impeller 301 in FIG. )have.

  The casing 302 is composed of an upper casing 302 and a lower casing 303 formed by resin molding, and an axial end face of the upper casing 302 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 thereof, and by fitting the protrusion and the recess as indicated by reference numeral 307, the upper casing 303 and the lower casing are obtained. Bonding 304 is performed to obtain a casing 302. In the present embodiment, a convex portion is formed on the mating surface of the upper casing 303, and a concave portion is formed on the mating surface of the lower casing 304.

  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 302 rotates in a counterclockwise direction as viewed from the viewpoint of FIG. 3, whereby air is drawn in the gap 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 exhaust is performed 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. That is, the distance (cross-sectional area) of the gap 308 gradually increases in the counterclockwise direction in FIG. 3 from the narrowest portion 207 having the narrowest gap (smallest cross-sectional area) in the gap 308. It has

  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 302 is formed by a U-shaped notch portion provided in the upper casing 302 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 that the mold structure becomes complicated to be obtained by integral molding, resulting in high cost.

(Structure of motor assembly)
A motor assembly 400 for driving the impeller 301 is shown in FIGS. 8 and 9. Motor assembly 400 is disposed behind 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. 7). The shaft 431 is rotatably held by the motor housing 403 via bearings 404 and 405 (see FIG. 7). 7 is an example of the second embodiment, but the structure of the impeller assembly 500 (FIGS. 8 and 9) and the structure of attachment to the lower casing 304 of the impeller assembly 500 are the same as in this embodiment. It is.

  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 from the substantially conical hub 321 and the hub 321 in the axial direction, 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. 7, 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 FIG. 9 is obtained. 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. 7). 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, the impeller assembly 500 of FIGS. 8 and 9 is obtained.

  Next, the impeller assembly 500 is mounted to the lower casing 304 (see FIGS. 2 and 7). 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. 7) 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. 8 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 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. 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 202a of the lower housing 202, and then strikes the inclined portion 206, where the direction is changed to the upper housing 201 and the air inlet 309 of the upper casing 303 You will be guided.

  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.

2. Embodiment 2 (see FIGS. 4 to 6)
The present embodiment relates to a structure in which the wall portion 311 is provided near the suction port 309 provided in the upper casing 303, and the reduction in efficiency due to the backflow from the vicinity of the narrowest portion 207 to the suction port 309 is improved. Further, in the present embodiment, in relation to the provision of the wall portion 311, the position of the inclined portion 206 is brought close to the intake port 101, and the end of the inclined portion 206 (the deepest part away from the intake port 101) 206a. Close to the intake port 101.

  Impeller assembly 500 (see FIG. 8), the shape and positional relationship of the intake port 101 and the exhaust port 102, and a gap 308 forming a flow path according to the involute curve formed between the impeller 301 and the lower casing 304. Is the same as in the first embodiment.

  In this example, the upper casing 303 is covered by the upper housing 201. The upper casing 303 is provided with a flange-shaped mating portion 310, and the upper housing 201 and the upper casing 303 are joined at this portion. Moreover, the level | step difference is formed in the joint surface of each other in the part to which said joining is performed, and the said joining is performed by uniting said level | step difference. Similarly, in the bonding of the upper housing 201 and the lower housing 202, a step is formed on the joint surface of each other, and the steps are combined.

  FIG. 6 shows that the upper housing 201 in FIG. 5 is removed and the impeller 301 is seen through. A wall 311 is provided near the suction port 309 in the upper casing 303. The wall portion 311 includes a flanged mating portion 310 integrally provided on the upper casing 303, and a side surface 201a of the upper housing 201 to be mated with the mating portion 310, and extends in a direction perpendicular to the axial direction There is.

  It is desirable that the wall portion 311 be provided at a position as close as possible to the edge 309 a of the suction port 309. In the case of FIG. 6, the smaller the distance L1 is, the better. In order to effectively obtain the function of the wall portion 311 to be described later, the distance L1 between the wall surface of the wall portion 311 and the edge of the suction port 309 is the wall portion 311 from the viewpoint viewed from the axial direction (viewpoint in FIG. 6). It is preferable to make the distance L2 smaller than the distance L2 between the wall surface of the frame and the narrowest part 207 (L1 <L2).

  As will be described later, the portion of the narrowest portion 207 of the gap 308 has a relatively high pressure, which inhibits the flow of air from the inside to the outside of the impeller 301 in that portion. Therefore, the wall portion 311 is provided so as not to be affected by the high pressure in the narrowest portion 207.

  Hereinafter, the superiority by arranging the wall portion 311 will be described. First, when viewed from the viewpoint of FIG. 6, the clearance 308 between the inner peripheral surface (inner peripheral wall) of the spiral casing 302 and the outer peripheral edge of the impeller 301 gradually increases in the counterclockwise direction from the narrowest portion 207 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 at the position of the tongue portion 205 near the exhaust port 102, but the cross-sectional area of the gap 308 is the smallest at the narrowest portion 207. The pressure may be high, causing a backflow of air from the outside to the inside of the impeller 301.

  As a result, a backflow to the suction port 309 of the upper casing 303 occurs from the vicinity of the narrowest portion 207 and between the blades of the impeller 301, and a part flows out from the suction port 309 into the inside of the upper housing 201. This phenomenon is manifested around symbol 312.

  On the other hand, the air introduced from the intake port 101 in FIG. 6 changes its direction along the inclined portion 206, and loosely turns to the suction port 309 while turning to the right as seen from the viewpoint of FIG. It flows into (the inside of the impeller 301). The air flow flowing into the suction port 309 and the air flow flowing into the impeller 301 from the narrowest portion 207 and flowing out from the suction port 309 at a portion 312 interfere with each other.

  If the wall 311 is separated from the suction port 309 (if the dimension of L1 is large), a vortex due to the above-mentioned interference occurs in the space between the suction port 309 and the wall 311. This phenomenon leads to a decrease in the efficiency of the blower apparatus and causes noise.

  On the other hand, as shown in FIG. 6, when the wall portion 311 is at a position close to the suction port 309, a backflow component that is going to flow out from the suction port 101 near the reference numeral 312 flows the air from the suction port 101 And the generation of the above-mentioned vortices is suppressed.

  Further, in the present embodiment, the position of the deepest portion 206 a of the inclined portion 206 formed in the lower housing 202 is provided closer to the intake port 101 than in the case of the first embodiment.

  The distance between the inner circumferential wall of the lower housing 202 and the lower casing 304, which continues from the air inlet 101 of the housing 200, gradually decreases. However, in the structure of the second embodiment, the position of the deepest portion 206 a of the inclined portion 206 seen from the air inlet 101 is closer to the air inlet 101 than in the case of the first embodiment, and the lower housing 202 and the lower casing 304 The distance between the two is not as narrow as in the first embodiment.

  For this reason, the air drawn in from the intake port 101 is guided in the space between the lower housing 202 and the lower casing 304 toward the upper housing 201 by the inclined portion 206 without receiving a large resistance.

  Further, in the structure shown in FIGS. 5 and 6, the upper housing 201 is in a position where it does not overlap the fixing attachment leg 305. Therefore, when a bolt is inserted into the through hole of the fixing attachment leg 305 and the casing 302 is fixed to the mount or the casing by the bolt, the tool for turning the bolt does not interfere with the upper housing 201 and the bolt is inserted. The work of turning is easy.

  The shape of the wall 311 in the viewpoint of FIG. 6 may be inclined (or curved) in the direction of the intake port 101 as it goes upward. In this structure, since the air from the inlet 101 smoothly flows from the inclined portion 206 along the wall 311, the flow velocity of the air flow from the inlet 101 in the vicinity of the reference numeral 312 is increased, and the suction in the vicinity of the reference numeral 312 The effect of suppressing the generation of vortices due to the backflow component which is going out from the port 309 is further enhanced.

3. Advantages of the Disclosed Embodiment 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. The intake port 101 and the exhaust port 102 are positioned so as to sandwich the impeller 301, and intake and exhaust are performed in a direction orthogonal to the axial direction. In this structure, the air volume characteristic can be secured even when there is not a sufficient space on the side surface of the blower apparatus 100.

  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 air flow is smoothly guided to the suction port 309 by the presence of the inclined portion 206.

  The lower casing 304 is formed integrally with the lower housing 202 and is formed of one member. As a result, the number of parts and the number of manufacturing steps can be reduced to reduce the cost.

  By providing the wall 311 in FIGS. 5 and 6, the decrease in efficiency and the generation of noise due to the high pressure state generated near the narrowest portion 207 can be suppressed.

4. Others In the contents disclosed above, the dimensions of the air inlet 101 formed in the housing 200, the distance from the air inlet 309 to the upper housing 201, the air inlet 309, the air outlet 102, etc. are appropriately determined according to the required air volume characteristics. Be done.

5. Conclusion The summary of the embodiment will be shown below. The blower apparatus 100 shown in FIG. 2 and FIG. 5 is located at a position sandwiching the impeller 301 when viewed from the axial direction, with an impeller 301 provided with a plurality of blades 323 (FIGS. 8 and 9) for blowing air in the centrifugal direction. An air intake port 101 for performing intake from a direction orthogonal to the axial direction and an exhaust port 102 for exhausting air in the direction orthogonal to the axial direction are provided.

  In addition, the blower apparatus 100 includes a housing 200 (upper housing 201 and lower housing 202) in which the intake port 101 and the exhaust port 102 are formed, and the impeller 301 is rotatably accommodated inside the housing 200. A casing 302 (upper casing 303 and lower casing 304) is disposed, and an axial end face of the casing 302 is provided with a suction port 309 (see FIGS. 2 and 5) for sucking in air taken in by the suction port 101. At the back of the intake port 101 of the housing 200, an inclined portion 200 for guiding the flow of air sucked in a direction perpendicular to the axial direction in the intake port 101 in the direction of the intake port 309 is provided.

  A gap 308 (see FIGS. 3 and 6) is provided between the impeller 301 and the casing 302. The gap 308 is the smallest in the narrowest portion 207 adjacent to the exhaust port 102, and the narrowest portion The space dimension gradually increases along the flow direction (counterclockwise direction in FIG. 6) of the air ejected from the impeller 301 from the impeller 301, and the space 313 in front of the suction port 309 inside the housing 200 7) is provided with a wall 311 to which the flow of air sucked from the air inlet 101 is applied, and seen from the axial direction, the wall 311 is disposed between the air inlet 309 and the narrowest portion 207. ing.

  The blower apparatus 100 shown in FIG. 6 includes an impeller 301 provided with a plurality of blades 323 (see FIG. 8) for blowing out air in the radial outer direction, an inlet 101 for suctioning in a direction orthogonal to the axial direction, and the axial direction A housing 302 having an exhaust port 102 for exhausting in a direction orthogonal to one another, and a housing 200 having an intake port 101 and an exhaust port 102 formed therein, and a casing 302 in which the impeller 301 is rotatably accommodated is disposed inside the housing 200. In the axial end face of the casing 302, a suction port 309 for sucking in the air taken in at the suction port 101 is provided, a gap 308 is provided between the impeller 301 and the casing 302, and the gap 308 is The clearance dimension is the smallest at the first portion (the narrowest portion 207) adjacent to the exhaust port 102, and is ejected from the impeller 301 from the first portion. The air gap has a structure in which the size of the gap gradually increases along the air flow direction, and a space 313 (see FIG. 7) in front of the suction port 309 inside the housing 200 , And the wall 311 extending in a direction perpendicular to the axial direction is provided. When viewed from the axial direction, the wall 311 is disposed between the rotation center of the impeller 301 and the first portion.

  In blower device 100 shown in FIG. 6, distance L1 between wall portion 311 and edge 309a of suction port 309 as viewed from the axial direction is compared with distance L2 between wall portion 311 and narrowest portion 207. Small.

  In the blower apparatus 100 shown in FIGS. 2 and 5, the casing 302 is constituted by an upper casing 303 and a lower casing 304, the housing 200 is constituted by an upper housing 201 and a lower housing 202, and the lower casing 304 and the lower The side housing 202 is composed of one member, and the lower housing 202 is formed with an inclined portion 206.

  DESCRIPTION OF SYMBOLS 100 ... Blower apparatus, 101 ... Intake port, 102 ... Exhaust port, 200 ... Housing, 201 ... Upper housing, 202 ... Lower housing, 202a ... Inner peripheral surface (inner peripheral wall), 205 ... Tongue part, 206 ... Inclined part, 206a: deepest part of inclined part, 207: narrowest part, 301: impeller, 302: casing, 303: upper casing, 304: lower casing, 305: mounting leg for fixing, 306: mounting leg for fixing, 307 ... Fitting part 308: A gap where the cross-sectional area gradually increases 309: suction port, edge of suction port 309, 310: mating part 311, wall part 312: part where backflow occurs 400: motor assembly 402 ... Circuit board, 403 ... Motor housing, 404 ... Bearing, 405 ... Bearing, 406 ... Motor cover, 410 ... Bracket, 411 ... Cylindrical part, 412 ... Flange part, 20 ... stator, 421 ... stator core, 422 ... insulator, 423 ... coil, 430 ... rotor.

Claims (6)

An impeller having a plurality of blades for blowing out fluid in a centrifugal direction;
A blower device comprising: an intake port located at a position sandwiching the impeller, viewed from an axial direction, for performing intake in a direction orthogonal to the axial direction, and an exhaust port for performing exhaust in a direction orthogonal to the axial direction. A housing having the air inlet and the air outlet formed thereon;
Inside the housing is disposed a casing rotatably accommodating the impeller,
The axial end face of the casing is provided with a suction port for sucking in the air taken in by the suction port,
The blower according to claim 1, wherein a sloped portion for guiding the flow of air sucked from the direction perpendicular to the axial direction in the air inlet in the direction of the air inlet is provided at the back of the air inlet of the housing. apparatus. A gap is provided between the impeller and the casing,
The gap has the smallest dimension in the first portion adjacent to the exhaust port, and the gap gradually increases in the flow direction of the fluid ejected from the impeller from the first portion. Have
A space in front of the suction port inside the housing is provided with a wall to which a flow of air sucked from the suction port is applied;
The blower apparatus according to claim 2, wherein the wall portion is disposed between the suction port and the first portion when viewed in the axial direction. An impeller provided with a plurality of blades for blowing out fluid in the radially outward direction;
An intake port for taking in air from a direction orthogonal to the axial direction, and an exhaust port for discharging air in a direction orthogonal to the axial direction;
A housing having the air inlet and the air outlet formed thereon;
Inside the housing is disposed a casing rotatably accommodating the impeller,
The axial end face of the casing is provided with a suction port for sucking in the air taken in by the suction port,
A gap is provided between the impeller and the casing,
The gap has the smallest dimension in the first portion adjacent to the exhaust port, and the gap gradually increases in the flow direction of the fluid ejected from the impeller from the first portion. Have
A space in front of the suction port inside the housing is provided with a wall to which a flow of air sucked from the suction port is applied;
Viewed from an axial direction, the wall portion is arranged between the rotation center of the impeller and the first portion. Looking from the axial direction,
The blower device according to claim 3 or 4, wherein a distance L1 between the wall portion and the edge of the suction port is smaller than a distance L2 between the wall portion and the first portion. The casing is composed of an upper casing and a lower casing,
The housing is composed of an upper housing and a lower housing,
The blower apparatus according to any one of claims 1 to 4, wherein the lower casing and the lower housing are formed of one member.

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