Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Axially extending shroud ring or casing
Reexamination Certificate
2002-06-17
2004-02-10
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Rotor having flow confining or deflecting web, shroud or...
Axially extending shroud ring or casing
C416SDIG002
Reexamination Certificate
active
06688848
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a propeller fan constituting a blower together with a drive motor; a molding die for the propeller fan; and a fluid feeding device provided with the blower, such as an outside unit of an air conditioner, an air cleaner, a humidifier, a dehumidifier, an electric fan, a fan heater, a cooling device, and a ventilator.
BACKGROUND ART
Conventionally, a propeller fan is used in a blower or a cooler. For example, the outside unit of an air conditioner is provided with a propeller fan for cooling.
The propeller fan for cooling has conventionally had a problem such that it produces high noise at rotation and thus is inefficient. Airflow may be reduced to lower the noise, which then presents a problem of insufficient achievement of cooling effect.
Moreover, there also was a problem of heavy weight, increasing not only the cost of manufacturing, but also the load applied to a drive motor at startup of the blower. Thus, the weight of the propeller fan may be made lighter, simply, by reducing the thickness of a blade. However, when the thickness of the blade is simply reduced, flow tends to separate from the wing, causing a problem such that, in addition to that the noise is increased, the rigidity of the blade is lowered, a centrifugal force deforms the blade at the time of operation of the blower, which reduces the height of the fan in the axial direction, and thus the airflow is degraded.
Moreover, there also was a problem such that the strength in the vicinity of a root of the blade is lower, causing the fan to rotate at a high speed when windblast is applied to the blower, and the centrifugal force therefrom damages the fan. Here, as a simple manner, the thickness of the blade root may partially be increased in order to increase the strength of the propeller fan. However, when the thickness of a part of the blade root is simply increased, cooling time at fabrication is increased to a large degree, raising the cost.
DISCLOSURE OF THE INVENTION
The present invention was made in view of the problems in the conventional example above, and an object of the present invention is to provide a propeller fan that can realize high airflow, high efficiency and low noise; a die for molding the same; and a fluid feeding device that can realize high airflow, high efficiency and low noise.
Another object of the present invention is to provide a propeller fan that can realize high airflow, high efficiency, low noise, light weight and low cost; a die for molding the same; and a fluid feeding device that can realize high airflow, high efficiency, low noise, light weight and low cost.
A further object of the present invention is to provide a propeller fan that can realize high airflow, high efficiency, low noise, light weight, low cost and increased strength; a die for molding the same; and a fluid feeding device that can realize high airflow, high efficiency, low noise, light weight, low cost and increased strength.
In a propeller fan according to the present invention, when coordinates in a cylindrical coordinate system having a z axis as a rotation axis of the propeller fan are (r, &thgr;, z), a curved shape defined by a r coordinate value, a &thgr; coordinate value and a z coordinate value indicated in Tables 3 and 4 below is determined as a base shape of the blade surface of the propeller fan, and the surface of the blade of the propeller fan is configured by a curved surface obtained by enlarging or reducing the base shape in at least one of r, &thgr; and z directions.
TABLE 3
&thgr;
r
0.042
0.083
0.125
0.167
0.208
0.25
0.292
0.333
0.375
0.417
0.458
0.5
0.4
0.145
0.181
0.214
0.246
0.276
0.304
0.329
0.353
0.375
0.395
0.414
0.137
0.164
0.190
0.214
0.237
0.261
0.284
0.307
0.329
0.350
0.371
0.45
0.085
0.134
0.176
0.215
0.249
0.280
0.310
0.337
0.363
0.388
0.412
0.433
0.080
0.118
0.152
0.183
0.211
0.239
0.265
0.291
0.317
0.341
0.365
0.387
0.5
0.074
0.124
0.168
0.209
0.246
0.282
0.315
0.345
0.375
0.402
0.428
0.453
0.061
0.105
0.144
0.179
0.211
0.242
0.271
0.300
0.328
0.355
0.381
0.405
0.55
0.044
0.102
0.153
0.200
0.242
0.282
0.319
0.354
0.386
0.417
0.445
0.473
0.036
0.087
0.133
0.174
0.211
0.246
0.279
0.310
0.340
0.369
0.397
0.424
0.6
0.077
0.137
0.190
0.238
0.283
0.325
0.364
0.399
0.433
0.464
0.494
0.065
0.120
0.168
0.211
0.250
0.286
0.320
0.352
0.384
0.414
0.443
0.65
0.050
0.119
0.180
0.234
0.285
0.331
0.374
0.413
0.450
0.484
0.517
0.043
0.105
0.160
0.210
0.254
0.295
0.332
0.367
0.400
0.433
0.464
0.7
0.096
0.167
0.228
0.283
0.333
0.379
0.422
0.462
0.501
0.538
0.087
0.152
0.210
0.261
0.307
0.349
0.387
0.423
0.457
0.489
0.75
0.072
0.152
0.222
0.284
0.339
0.389
0.435
0.478
0.519
0.558
0.065
0.137
0.201
0.258
0.308
0.354
0.395
0.435
0.473
0.510
0.8
0.043
0.133
0.212
0.282
0.346
0.402
0.452
0.498
0.541
0.582
0.040
0.119
0.191
0.255
0.311
0.361
0.408
0.450
0.490
0.529
0.85
0.114
0.203
0.282
0.350
0.410
0.465
0.514
0.560
0.604
0.103
0.183
0.252
0.313
0.369
0.419
0.466
0.510
0.552
0.9
0.093
0.193
0.278
0.351
0.415
0.473
0.526
0.575
0.621
0.086
0.174
0.250
0.317
0.376
0.431
0.481
0.528
0.572
0.95
0.180
0.274
0.352
0.420
0.480
0.535
0.586
0.635
0.165
0.251
0.324
0.387
0.444
0.496
0.546
0.594
&thgr;
r
0.542
0.583
0.625
0.667
0.708
0.75
0.792
0.833
0.875
0.917
0.958
1
0.4
0.429
0.438
0.392
0.414
0.45
0.452
0.466
0.474
0.409
0.430
0.453
0.5
0.475
0.494
0.508
0.515
0.428
0.450
0.473
0.498
0.55
0.498
0.521
0.540
0.554
0.559
0.449
0.473
0.497
0.522
0.549
0.6
0.522
0.549
0.573
0.593
0.606
0.471
0.498
0.524
0.550
0.577
0.65
0.547
0.577
0.605
0.630
0.650
0.663
0.494
0.524
0.552
0.580
0.607
0.637
0.7
0.572
0.604
0.634
0.662
0.688
0.709
0.723
0.521
0.551
0.580
0.608
0.636
0.664
0.696
0.75
0.595
0.629
0.662
0.692
0.720
0.746
0.769
0.784
0.544
0.577
0.608
0.638
0.666
0.693
0.722
0.753
0.8
0.621
0.659
0.694
0.726
0.756
0.785
0.809
0.829
0.845
0.567
0.604
0.638
0.670
0.700
0.729
0.754
0.779
0.809
0.85
0.646
0.686
0.725
0.761
0.793
0.821
0.848
0.873
0.895
0.907
0.913
0.593
0.632
0.670
0.705
0.736
0.764
0.790
0.816
0.840
0.864
0.893
0.9
0.666
0.709
0.751
0.791
0.826
0.858
0.885
0.908
0.930
0.949
0.963
0.969
0.615
0.657
0.699
0.737
0.772
0.802
0.829
0.852
0.875
0.897
0.919
0.943
0.95
0.681
0.726
0.769
0.811
0.850
0.884
0.914
0.939
0.960
0.976
0.990
0.997
0.640
0.685
0.728
0.769
0.807
0.840
0.869
0.894
0.916
0.936
0.957
0.979
BOSS RATIO &ngr; = 0.35
TABLE 4
r
&thgr;
z
0.383
0.641
0.453
0.446
0.466
0.660
0.487
0.480
0.569
0.724
0.577
0.571
0.697
0.814
0.721
0.714
0.859
0.984
0.923
0.916
0.924
1.034
0.984
0.978
0.972
0.981
0.998
0.991
0.993
0.910
0.985
0.977
1.000
0.838
0.953
0.946
1.000
0.757
0.900
0.893
1.000
0.678
0.829
0.823
1.000
0.539
0.680
0.674
1.000
0.403
0.515
0.509
1.000
0.334
0.415
0.411
1.000
0.260
0.279
0.275
1.000
0.209
0.157
0.154
0.972
0.181
0.092
0.090
0.946
0.170
0.077
0.075
0.877
0.147
0.051
0.049
0.847
0.138
0.044
0.042
0.808
0.125
0.038
0.037
0.762
0.110
0.033
0.031
0.728
0.098
0.028
0.026
0.704
0.090
0.026
0.024
0.680
0.079
0.023
0.022
0.641
0.062
0.015
0.013
0.584
0.034
0.006
0.004
0.521
0.014
0.027
0.020
In Tables 3 and 4, r indicates a non-dimensional r coordinate in the radial direction in the cylindrical coordinate system having the z axis as the rotation axis of the propeller fan, &thgr; indicates a non-dimensional &thgr; coordinate in the circumferential direction in the cylindrical coordinate system having the z axis as the rotation axis of the propeller fan, and z indicates a non-dimensional z coordinate in the axial direction (the direction of height) in the cylindrical coordinate system having the z axis as the rotation axis of the propeller fan.
Moreover, the top of each column (z
u
) indicates a coordinate value on a negative pressure side (suction side) of the propeller fan, whereas the bottom of each column (z
d
) indicates a coordinate value on a positive pressure side (blowing side) thereof. Table 3 indicates a non-dimensional coordinate value of z where r is within the range of 0.4 to 0.95 and where &thgr; is within the range of 0.042 to 1, and Table 4 indicates non
Kershteyn Igor
Sharp Kabushiki Kaisha
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