CN112075015A - Centrifugal fan and vehicle-mounted AC generator - Google Patents
Centrifugal fan and vehicle-mounted AC generator Download PDFInfo
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- CN112075015A CN112075015A CN201880093091.4A CN201880093091A CN112075015A CN 112075015 A CN112075015 A CN 112075015A CN 201880093091 A CN201880093091 A CN 201880093091A CN 112075015 A CN112075015 A CN 112075015A
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- 210000000078 claw Anatomy 0.000 claims description 8
- 238000001816 cooling Methods 0.000 abstract description 10
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 238000004804 winding Methods 0.000 description 20
- 238000005259 measurement Methods 0.000 description 13
- 230000004048 modification Effects 0.000 description 10
- 238000012986 modification Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 238000010248 power generation Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000004907 flux Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/006—Structural association of a motor or generator with the drive train of a motor vehicle
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
In a centrifugal fan, comprising: a main plate formed in a ring shape; a plurality of arm plates extending radially outward from an outer periphery of the main plate; and blades extending from the plurality of arm plates, respectively, wherein at least one of the arm plates and the main plate is provided with an opening portion penetrating in the axial direction. By providing the opening portion through which the air passes in the axial direction, the amount of air flowing in the axial direction can be increased without increasing noise. This improves the cooling performance of the vehicle-mounted alternator.
Description
Technical Field
The present invention relates to a centrifugal fan that is attached to, for example, a rotor to cool a rotating electrical machine, and an on-vehicle alternator including the centrifugal fan.
Background
An on-vehicle alternator mounted on a vehicle charges a battery during running of the vehicle and supplies electric power to on-vehicle electrical components. Currently, a vehicle-mounted alternator is expected to be downsized and have a high output. Further, the noise outside the vehicle is limited from an environmental point of view, and the noise reduction of the vehicle-mounted alternator is desired.
As the vehicle-mounted alternator is miniaturized, the centrifugal fan for cooling that rotates integrally with the rotor of the vehicle-mounted alternator is also miniaturized. When the centrifugal fan is downsized, the cooling air volume decreases, and the cooling capacity of the on-vehicle alternator decreases. However, if the number of blades of the centrifugal fan is increased to increase the air volume, noise due to wind noise becomes large.
Therefore, the following technical scheme is disclosed: the centrifugal fan has a blade shape optimized to generate air flows flowing in the radial and axial directions, thereby increasing the air volume and reducing noise (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 9-154256
Disclosure of Invention
Technical problem to be solved by the invention
The centrifugal fan disclosed in patent document 1 guides an air flow in the axial direction so that the outer diameter side of at least one blade leading edge coincides with the side surface of the claw magnetic pole of the claw core of the rotor core. However, there are the following technical problems: in the portion where the outer diameter side of the blade leading edge is not aligned with the side surface of the claw-shaped magnetic pole of the rotor core, the effect of guiding the air flow in the axial direction is small, and the cooling performance is low.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a centrifugal fan capable of increasing the amount of air flowing in the direction of the rotation axis without increasing noise.
Technical scheme for solving technical problem
The centrifugal fan of the present invention includes: a main plate formed in a ring shape; a plurality of arm plates extending radially outward from an outer periphery of the main plate; and blades extending from the plurality of arm plates, respectively, wherein at least one of the arm plates and the main plate is provided with an opening portion penetrating in the axial direction.
Effects of the invention
In the present invention, by providing the opening portion through which the air passes in the axial direction inside the blades of the centrifugal fan, the amount of air flowing in the axial direction can be increased without increasing noise. This improves the cooling performance of the vehicle-mounted alternator.
Drawings
Fig. 1 is a sectional view illustrating a structure of an in-vehicle alternator in which a centrifugal fan according to a first embodiment of the present invention is disposed.
Fig. 2 is a perspective view showing a centrifugal fan according to a first embodiment of the present invention.
Fig. 3 is a sectional view of the centrifugal fan taken along the line iii-iii in fig. 2.
Fig. 4 is a view showing an example of an opening of a centrifugal fan according to a first embodiment of the present invention.
Fig. 5 is a view showing a first modification of the centrifugal fan according to the first embodiment of the present invention.
Fig. 6 is a diagram showing a second modification of the centrifugal fan according to the first embodiment of the present invention.
Fig. 7 is a view showing a mounting surface side of a field core of a vehicle-mounted ac generator to which a centrifugal fan according to a first embodiment of the present invention is mounted.
Fig. 8 is a view showing a state in which the centrifugal fan according to the first embodiment of the present invention is attached to the attachment surface of the field core of the vehicle-mounted ac generator.
Fig. 9 is a diagram showing a state in which a centrifugal fan according to a first modification of the first embodiment of the present invention is mounted on a mounting surface of a field core of an on-vehicle ac generator.
Fig. 10 is a diagram illustrating a relationship between noise and output and an opening of a centrifugal fan in an in-vehicle alternator having the centrifugal fan mounted thereon.
Detailed Description
Hereinafter, preferred embodiments of a centrifugal fan and a vehicle-mounted alternator according to the present invention will be described with reference to the drawings.
Implementation mode one
Fig. 1 is a cross-sectional view of a vehicle-mounted alternator in which a centrifugal fan according to a first embodiment of the present invention is disposed, as viewed from the side.
In fig. 1, the vehicle-mounted ac generator includes a casing 52, and the casing 52 is composed of a front casing 51 and a rear casing 50 made of aluminum and having a substantially bowl shape, respectively. Further, the vehicle-mounted alternator includes: a shaft 54, the shaft 54 being rotatably supported by the housing 52 through a pair of bearings 53; and a pulley 7, the pulley 7 being fixed to an end of a shaft 54 protruding from the front side of the housing 52. The front bearing 53 is supported by the front housing 51, and the rear bearing 53 is supported by the rear housing 50.
Further, the vehicle-mounted alternator has a rotor 8 and a stator 9, wherein the rotor 8 is fixed to a shaft 54 and disposed in a housing 52, and rotates integrally with the shaft 54, and the stator 9 is fixed to the housing 52 so as to surround the rotor 8. Further, the vehicle-mounted alternator includes: a pair of slip rings 10 fixed to a protruding portion of the shaft 54 protruding on the rear side of the housing 52 and supplying current to the rotor 8; a pair of brushes 11, the pair of brushes 11 being housed in the brush holder 17 and sliding on the surface of each slip ring 10; and a voltage regulator 12, the voltage regulator 12 being disposed adjacent to the pair of brushes 11 and regulating the magnitude of the alternating voltage generated by the stator 9.
Further, the vehicle-mounted alternator includes: a rectifying device 13, the rectifying device 13 converting an alternating voltage generated by the stator 9 into a direct voltage; a connector 20, the connector 20 transmitting signals between the voltage regulator 12 and an external device; and a protective cover 27, the protective cover 27 being mounted to the rear case 50 to cover the voltage regulator 12, the rectifying device 13, and the brush holder 17.
The rotor 8 is a lundell-type rotor, and includes a field winding 81 to which a field current flows and which generates a magnetic flux, and a field core 82 which is provided so as to be fixed to the shaft 54 penetrating an axial center position, covers the field winding 81, and forms a magnetic pole by the magnetic flux generated by the field winding 81.
The centrifugal fan 1 according to the first embodiment of the present invention is disposed on the mounting surface S of the rotor 8 on the pulley 7 side.
The stator 9 is coaxially disposed on the outer periphery of the rotor 8. The stator 9 includes: a cylindrical stator core 91; and a stator winding 92, the stator winding 92 being attached to the stator core 91, and generating an alternating current in accordance with a change in magnetic flux from the field winding 81 as the rotor 8 rotates.
The stator core 91 is sandwiched between the front housing 51 and the rear housing 50 from both axial sides. The lead wires 92a of the stator winding 92 are led out from the rear case 50 to be wired to the terminals 24a of the circuit board 24. Thereby, the rectifying device 13 is electrically connected to the stator winding 92. The rectifying device 13 includes a heat sink 18 on which a plurality of rectifying elements are mounted, and a circuit board 24.
In the vehicle-mounted alternator configured as described above, the rotational torque of the engine, not shown, is transmitted to the shaft 54 via the pulley 7, and the rotor 8 is rotated. At this time, current is supplied to the field winding 81 of the rotor 8 through the brushes 11 and the slip rings 10, thereby generating magnetic flux.
The N-poles and S-poles are alternately formed in the circumferential direction by the magnetic flux in a plurality of claw-like magnetic poles arranged on the outer peripheral portion of the field core 82. Thereby, the rotating magnetic field is supplied to the stator winding 92 of the stator 9, and an electromotive force of an alternating current is generated in the stator winding 92. The electromotive force of the alternating current is supplied to the rectifying device 13 through the lead wire 92a to be rectified in the rectifying device 13, and the magnitude of the electromotive force of the alternating current is adjusted by the voltage regulator 12 to be supplied to the battery and the vehicle-mounted electrical equipment.
Further, since the rotor 8 rotates, the centrifugal fan 1 fixed to the field core 82 on the pulley 7 side rotates. As the centrifugal fan 1 rotates, outside air is drawn into the casing 52 through an opening formed in the front housing 51. The outside air sucked into the casing 52 flows in the axial direction in the front case 51 to reach the field core 82, and the front coil ends of the field winding 81 and the stator winding 92 are cooled.
Next, a centrifugal fan 1 according to a first embodiment of the present invention will be described with reference to fig. 2 to 6.
Fig. 2 is a perspective view showing the centrifugal fan 1 according to the first embodiment of the present invention. Fig. 3 is a sectional view of the centrifugal fan 1 taken along the line iii-iii in fig. 2.
As shown in fig. 2, the centrifugal fan 1 includes a main plate 2, six arm plates 3 extending radially outward from the outer periphery of the main plate 2, and blades 4 extending from the arm plates 3.
The main plate 2 is formed in a ring shape with a through hole provided in the center. The main plate 2 is fixed to a rotor 8 of an on-vehicle alternator shown in fig. 1, for example, through the through hole. A step portion 2a is formed on the outer edge of the through hole.
Each arm plate 3 extends radially outward from the outer peripheral end of the main plate 2. Each arm plate 3 is connected to the main plate 2 in such a manner that there is no difference in level between the front and back surfaces. As shown in fig. 2, six arm plates 3 are arranged at unequal intervals in the circumferential direction of the main plate 2. The width of each arm plate 3 in the radial direction is formed to be narrow on the front side in the rotation direction RD and wide on the rear side in the rotation direction RD.
Each vane 4 extends from the outer peripheral side of each arm plate 3 at substantially right angles to the same side in the axial direction. Each blade 4 has a rear edge 4b located on the rear side in the rotation direction RD and a front edge 4a located on the front side in the rotation direction RD. The distance from the rotation center C of the centrifugal fan 1 to the trailing edge 4b of each blade 4 is longer than the distance from the rotation center C to the leading edge 4a of each blade 4. That is, each blade 4 is formed such that the leading edge 4a is inclined in a direction toward the rotation center C.
By inclining the blades 4 as described above, when the centrifugal fan 1 is rotated, the impact generated by the collision of the leading edges 4a with the air can be reduced. This reduces wind noise generated by each blade 4.
The shape of each blade 4 projected on the surface perpendicular to the rotation axis is formed in a gentle arc shape that protrudes toward the rotation center C with respect to a line connecting the front edge 4a and the rear edge 4 b.
The centrifugal fan 1 having the main plate 2, the arm plates 3, and the blades 4 arranged as described above generates an air flow flowing radially outward along the blades 4. Thereby, the centrifugal fan 1 converts the air flow toward the center portion of the main plate 2 into the air flow toward the radial outside.
The shape of the main plate 2 is not limited to a ring shape, and the stepped portion 2a may not be provided. The central portion of the main plate 2 may be formed in a bowl-like raised shape.
The number of arm plates 3 is not limited to six. For example, the number of the arm plates 3 may be eight or more, or may be an odd number. The arm plates 3 may be arranged at equal intervals, and reinforcing ribs may be provided to the arm plates 3.
The shape of each blade 4 projected on a plane perpendicular to the rotation axis may be linear or S-shaped, and the shape of each blade 4 may be different. Further, each blade 4 may extend from an intermediate position of each arm plate 3. Further, an annular shroud may be disposed radially outward of each blade 4.
As shown in fig. 2, an opening 5 that penetrates in the axial direction on the radially inner side of the blade 4 is provided in an arm plate 32 that is one of the six arm plates 3 of the centrifugal fan 1. The opening 5 is formed along the blade 4 in a range of 50% to 95% of the circumferential length of the blade 4.
As shown in fig. 3, a round or chamfered R is formed on the outer edge of the opening 5. This can reduce the resistance applied to the air flow passing through the opening 5, and can suppress a decrease in the flow velocity of the air flowing in the axial direction.
When the centrifugal fan 1 generates an air flow directed radially outward, a positive pressure is formed radially outward of each blade 4, and a negative pressure is formed radially inward of each blade 4. Therefore, a part of the air flow flowing radially outward from the center of the centrifugal fan 1 is sucked toward the opening 5 by the negative pressure formed radially inward of the blades 4, passes through the opening 5, and flows in the axial direction.
As described above, according to the centrifugal fan 1 of the first embodiment, the opening 5 is provided in the arm plate 3 of the centrifugal fan 1. Further, a part of the air flow flowing radially outward from the center of the centrifugal fan 1 passes through the opening 5. This can increase the flow rate of air flowing in the axial direction of the centrifugal fan 1 without increasing noise. Therefore, the centrifugal fan 1 has an improved capability of cooling the front coil ends of the centrifugal winding 81 and the stator winding 92 of the field core 82.
The opening 5 may be provided in one of the two arm plates 3 in which the angle θ formed by two straight lines connecting the outer edges of the adjacent two arm plates 3 on the front side in the rotation direction and the rotation center C of the main plate 2 is smallest.
For example, as shown in fig. 2, the adjacent two arm plates 31, 32 are closest among the six arm plates 3. Therefore, an angle θ formed by a straight line connecting the outer edge 31a on the rotation direction front side of the arm plate 31 and the rotation center C of the main plate 2 and a straight line connecting the outer edge 32a on the rotation direction front side of the arm plate 32 and the rotation center C of the main plate 2 is smaller than an angle θ formed by a combination of the other arm plates 3. Therefore, the opening 5 is provided in one of the two arm plates 31, 32. Here, the arm plate 32 is provided with an opening 5.
By disposing the opening 5 as described above, the weight of the portion of the centrifugal fan 1 adjacent to the adjacent arm plate 3 can be reduced. Thus, since the weight distribution in the circumferential direction of the centrifugal fan 1 is unbalanced, when the centrifugal fan 1 is rotated, it is possible to suppress a load in the rotational direction from being applied to the vehicle-mounted alternator.
Fig. 4 is a diagram showing an example of the shape of the opening 5. In fig. 4, a distance t2 of a shortest portion between the outer edge of the opening 5 and the end 3a on the rear side in the rotation direction RD of the arm plate 3 may be 1mm or more. The distance t3 of the shortest portion between the outer edge of the opening 5 and the root of the blade 4 may be 1mm or more. This reduces the decrease in strength of the arm plate 3 and the blade 4.
The shape of the opening 5 is not limited to that shown in fig. 4. For example, the shape of the opening 5 may be a circular shape, an elliptical shape, or a polygonal shape.
In the first embodiment, the opening 5 is provided in the arm plate 3, but the position of the opening 5 is not limited to this. For example, the opening 5 may be formed so as to extend over the main board 2, or may be formed only in the main board 2. When adjacent arm plates 3 are close to each other, the adjacent two arm plates 3 may be integrated, and the opening 5 may be formed in the integrated arm plates 3.
In the first embodiment, the opening 5 is provided only in one arm plate 32, but the number of openings 5 is not limited to one. For example, one opening 5 may be provided for each arm plate 3, or the openings 5 may be provided for each arm plate 3 arranged in the circumferential direction with a gap therebetween. Further, a plurality of openings 5 may be provided in one arm plate 3. Further, the shape of each opening 5 may be different. This can reduce the weight of the centrifugal fan 1.
By increasing the opening 5 as described above, the center of gravity of the centrifugal fan 1 can be brought closer to the center of gravity C. This stabilizes the rotation of the centrifugal fan 1. In this case, the size of the opening 5 provided in each arm plate 3 is determined in consideration of the weight balance in the circumferential direction of the centrifugal fan 1.
The opening 5 may be a notch 6 that opens rearward in the rotation direction RD, as in the centrifugal fan 1A of the first modification shown in fig. 5. The opening 5 may be a notch 6B that is open on the front side in the rotation direction RD, as in the centrifugal fan 1B of the second modification shown in fig. 6. The centrifugal fan 1A according to the first modification and the centrifugal fan 1B according to the second modification can also obtain the same technical effects as the centrifugal fan 1 according to the first embodiment.
In addition, regarding the shapes of the centrifugal fan 1A of the first modification and the centrifugal fan 1B of the second modification, the widths of the connecting portions of the arm plates 3A, 3B and the blades 4A, 4B in the circumferential direction are narrowed. Therefore, the strength of the connecting portions between the arm plates 3A, 3B and the blades 4A, 4B is reduced. Therefore, the length of the notch 6 and the notch 6B in the direction along the blades 4A and 4B, that is, the depth of the notch 6 and the notch 6B may be about 50% of the length of the blades 4A and 4B.
Next, an in-vehicle alternator to which the centrifugal fan 1 according to the first embodiment of the present invention is mounted will be described with reference to fig. 7 to 10.
Fig. 7 is a view showing the field core 82 of the vehicle-mounted ac generator on the side of the mounting surface S of the centrifugal fan 1. The mounting surface S of the centrifugal fan 1 is provided on the opposite side to the side from which the eight claw-shaped magnetic poles provided on the field core 82 extend.
A region 84 indicated by oblique lines in fig. 7 indicates a range in which the field winding 81 of the field core 82 can be effectively cooled. Therefore, the more the centrifugal fan 1 is attached to the attachment surface S and the more the portion where the projection area of the opening 5 on the attachment surface S overlaps the area 84, the higher the cooling performance of the centrifugal fan 1.
The region 84 is formed in a range having a width t1 along the outer edge 83, which connects the adjacent two claw poles 821 and 822, as a center. The region 84 of the claw pole 821 on the rear side in the rotation direction RD is a range from the rotation center C to the distance Rj1 to the radially outer side. On the other hand, the region 84 of the claw-shaped magnetic pole 822 on the front side in the rotation direction RD is a range from the rotation center C to the distance Rj2 to the outside in the radial direction.
Here, the width t1 of the region 84 is set to 20mm or less. When the outer diameter of the field core 82 is R0, the minimum radius of the mounting surfaces S on the root sides of the claw poles 821 and 822 is R1, the maximum radius of the mounting surfaces S on the tip sides of the claw poles 821 and 822 is R2, and the larger one of the values of R0 × 0.9 and R2 is R2m, the region 84 is set in a range satisfying the following relationship:
Rj1≤(R0+R1)/2；
Rj2≤R2m。
in fig. 7, the negative pressure generated between the root of the claw-shaped magnetic pole 821 and the root of the claw-shaped magnetic pole 822 of the field core 82 is the lowest. Therefore, in the region 84, the cooling effect by the air flow close to the rotation center C side is higher than that by the air flow far from the rotation center C side. Therefore, the region 84 may be set so as to satisfy the following relationship, and the opening 5 of the centrifugal fan 1 may be formed so as to overlap the region 84.
Rj2≤(R0+R1)/2
Fig. 8 is a diagram showing a state in which the centrifugal fan 1 according to the first embodiment is mounted so that the opening 5 of the centrifugal fan 1 overlaps the region 84 of the field core 82. Fig. 9 is a diagram showing a state in which the centrifugal fan 1A according to the first modification is attached so that the notch 6 of the centrifugal fan 1A overlaps the region 84 of the field core 82.
By attaching the centrifugal fan 1 and the centrifugal fan 1A to the field core 82 as described above, the flow rate of the air flowing in the axial direction can be increased without increasing the wind noise generated by the centrifugal fan 1 and the centrifugal fan 1A. Therefore, the cooling capability of the front coil ends of the field winding 81 and the stator winding 92 of the field core 82 can be improved. This can increase the power generation output of the vehicle-mounted alternator.
Next, the results of confirming the effects of the centrifugal fan 1 according to the first embodiment of the present invention will be described.
Fig. 10 is a graph showing the results of measuring noise and power generation output by attaching two types of centrifugal fans to the same vehicle-mounted alternator. The horizontal axis of the graph indicates the value of the noise N, which indicates that the value of the noise becomes larger as it goes to the right side of the horizontal axis. The vertical axis of the graph indicates the value of the power generation output P, and indicates that the value of the power generation output increases as the vertical axis goes upward.
In the graph of fig. 10, the measurement values of the centrifugal fan not provided with the opening 5 are indicated by square marks, and the measurement values of the centrifugal fan 1 according to the first embodiment of the present invention are indicated by triangular marks and circular marks. The opening 5 of the centrifugal fan 1 indicated by a circular mark is larger than the opening 5 of the centrifugal fan 1 indicated by a triangular mark.
Note that the centrifugal fan of the measurement value group F1 connected by a dotted line has a larger maximum air volume than the centrifugal fan of F2, unlike the centrifugal fan of the measurement value group F2 connected by a broken line, for example, in terms of the shape of the blades 4.
In the graph of fig. 10, the measured value of the noise of the centrifugal fan not provided with the opening 5 and the measured value of the power generation output, which are indicated by the square marks of the measurement value group F1, are set to the respective references "0".
As can be seen from the results shown in fig. 10, in both of the measurement value group F1 and the measurement value group F2, the noise N of the measurement value (triangular mark, circular mark) of the centrifugal fan 1 according to the first embodiment having the opening 5 is small and the power generation output P is large, compared to the measurement value (rectangular mark) of the centrifugal fan not having the opening 5. In both of the measurement value group F1 and the measurement value group F2, the noise N of the measurement value (circle mark) of the centrifugal fan 1 having the large size of the opening 5 is smaller than the noise N of the measurement value (circle mark) of the centrifugal fan 1 having the small size of the opening 5, and the power generation output P is larger.
As can be seen from the above, the vehicle-mounted alternator mounted with the centrifugal fan 1 according to the first embodiment of the present invention has an effect of reducing noise and an effect of increasing power generation output, compared to a vehicle-mounted alternator mounted with a centrifugal fan not provided with the opening 5. In addition, in the vehicle-mounted alternator to which the centrifugal fan 1 according to the first embodiment is mounted, it is confirmed that the larger the size of the opening 5 provided in the centrifugal fan 1 is, the larger the effect of reducing noise and the effect of increasing the power generation output are.
Description of the symbols
1. 1A, 1B centrifugal fan; 2. 2A, 2B mainboard; 2a step part; 3. 3A, 3B arm plates; 3a end portion; 4. 4A, 4B blades; 4a leading edge; 4b trailing edge; 5 an opening part; 6. 6B, a notch; 7 belt wheels; 8, a rotor; 9 a stator; 10 collector rings; 11 electric brushes; 12 a voltage regulator; 13 a rectifying device; 17 brush holders; 18 a heat sink; 20 a connector; 24a circuit board; a 24a terminal; 27 a protective cover; 31. a 32-arm plate; 31a, 32a outer edge; 50 a rear housing; 51 a front case; 52 an outer shell; 53 bearings; 54 shafts; 81 excitation windings; 82 a field core; 83 outer edges; 84 area; 91 a stator core; 92a stator winding; 92a conductive lines; 821. 822 claw-shaped magnetic poles.
Claims (11)
1. A centrifugal fan, comprising:
a main plate formed in a ring shape;
a plurality of arm plates extending radially outward from an outer periphery of the main plate; and
blades respectively extending from the plurality of arm plates,
the centrifugal fan is characterized in that it is provided with,
at least one of the arm plates and the main plate is provided with an opening portion that penetrates in the axial direction and through which air passes.
2. The centrifugal fan of claim 1,
the opening is provided radially inward of the blade.
3. The centrifugal fan according to claim 1 or 2,
the opening is provided in one of the two arm plates that minimize an angle formed by two straight lines connecting outer edges on the front sides in the rotation direction of the two adjacent arm plates and the rotation center of the main plate.
4. The centrifugal fan according to any one of claims 1 to 3,
the outer edge of the opening is rounded or chamfered.
5. The centrifugal fan according to any one of claims 1 to 4,
the distance between the outer edge of the opening and the root of the blade is 1mm or more.
6. The centrifugal fan according to any one of claims 1 to 5,
the distance between the outer edge of the opening and the outer edge of the arm plate on the rear side in the rotation direction is 1mm or more.
7. The centrifugal fan according to any one of claims 1 to 5,
the opening is a notch that opens rearward in the rotation direction.
8. The centrifugal fan according to any one of claims 1 to 6,
the opening is a notch that opens toward the front in the rotation direction.
9. An on-vehicle alternator having the centrifugal fan according to any one of claims 1 to 8,
the vehicle-mounted AC generator includes a field core having a plurality of claw-shaped magnetic poles arranged in a circumferential direction,
the centrifugal fan is mounted on a mounting surface of the field core, the mounting surface being provided on a side opposite to a side from which the plurality of claw-shaped magnetic poles extend,
the opening is formed in the following shape: a projection area of the opening portion on the mounting surface overlaps an area along an outer edge connecting between two adjacent claw-shaped magnetic poles with the outer edge as a center,
in the region, the region of the claw pole on the front side in the rotation direction of the field core is a range from the rotation center of the field core to a distance Rj2 to the outside in the radial direction, and the region of the claw pole on the rear side in the rotation direction of the field core is a range from the rotation center to a distance Rj1 to the outside in the radial direction,
the outer diameter of the field core is set to R0,
the minimum radius of the mounting surface on the root side of the plurality of claw-shaped magnetic poles is R1,
r2 represents the maximum radius of the mounting surface on the tip side of the plurality of claw-shaped magnetic poles,
the larger value of the values of R0 × 0.9 and R2 is set to R2m,
at this time, the following relationship is satisfied:
Rj1≤(R0+R1)/2；
Rj2≤R2m。
10. the vehicle-mounted alternator according to claim 9,
the regions also satisfy the following relationship:
Rj2≤(R0+R1)/2。
11. the on-vehicle alternator according to claim 9 or 10,
the width of the region in a direction perpendicular to an outer edge connecting the adjacent two claw-shaped magnetic poles is 20mm or less.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2018/017635 WO2019215785A1 (en) | 2018-05-07 | 2018-05-07 | Centrifugal fan, and ac generator for mounting on vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112075015A true CN112075015A (en) | 2020-12-11 |
| CN112075015B CN112075015B (en) | 2023-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880093091.4A Active CN112075015B (en) | 2018-05-07 | 2018-05-07 | Centrifugal fan and vehicle-mounted alternator |
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| Country | Link |
|---|---|
| JP (1) | JP6775611B2 (en) |
| CN (1) | CN112075015B (en) |
| DE (1) | DE112018007576T5 (en) |
| WO (1) | WO2019215785A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10975879B2 (en) | 2018-07-18 | 2021-04-13 | The Charles Machine Works, Inc. | Centrifugal fan |
| JP6961038B1 (en) * | 2020-05-12 | 2021-11-05 | 三菱電機株式会社 | Centrifugal fan and rotary electric machine |
| JP7154445B1 (en) * | 2021-08-18 | 2022-10-17 | 三菱電機株式会社 | Rotating electric machine |
| WO2024042561A1 (en) * | 2022-08-22 | 2024-02-29 | 三菱電機株式会社 | Rotary electric machine |
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| JP2002084713A (en) * | 2000-09-07 | 2002-03-22 | Mitsubishi Electric Corp | Ac generator |
| CN1780989A (en) * | 2003-05-26 | 2006-05-31 | 瓦莱奥电机设备公司 | Ventilation device, especially for a motor vehicle alternator |
| CN101316061A (en) * | 2007-05-28 | 2008-12-03 | 三菱电机株式会社 | AC generator for vehicle |
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| JP3674211B2 (en) * | 1997-01-31 | 2005-07-20 | 株式会社デンソー | Vehicle alternator |
| JP2013013229A (en) * | 2011-06-29 | 2013-01-17 | Toyota Motor Corp | Stator for rotary electric machine |
| JP6032056B2 (en) * | 2013-02-25 | 2016-11-24 | シンフォニアテクノロジー株式会社 | Rotating device |
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2018
- 2018-05-07 DE DE112018007576.1T patent/DE112018007576T5/en active Pending
- 2018-05-07 CN CN201880093091.4A patent/CN112075015B/en active Active
- 2018-05-07 WO PCT/JP2018/017635 patent/WO2019215785A1/en active Application Filing
- 2018-05-07 JP JP2018565911A patent/JP6775611B2/en active Active
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| JP2002084713A (en) * | 2000-09-07 | 2002-03-22 | Mitsubishi Electric Corp | Ac generator |
| CN1780989A (en) * | 2003-05-26 | 2006-05-31 | 瓦莱奥电机设备公司 | Ventilation device, especially for a motor vehicle alternator |
| CN101316061A (en) * | 2007-05-28 | 2008-12-03 | 三菱电机株式会社 | AC generator for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019215785A1 (en) | 2019-11-14 |
| CN112075015B (en) | 2023-11-21 |
| JP6775611B2 (en) | 2020-10-28 |
| JPWO2019215785A1 (en) | 2020-05-28 |
| DE112018007576T5 (en) | 2021-01-21 |
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