JP6706274B2 - Propeller device for generator - Google Patents

Description

The present invention relates to a generator propeller device that rotates a rotating shaft of a generator.

BACKGROUND ART Conventionally, there is known a propeller device for a generator, which includes a propeller main body and a tapered cover that is provided radially outside the propeller main body. The cover extends from the propeller body toward the downstream side. Further, the cover is arranged so that the radial dimension thereof becomes larger toward the downstream side. When air flows inside the cover, the propeller body rotates and a negative pressure space is formed in the space downstream of the cover. This increases the velocity of the air flowing inside the cover. As a result, the rotation speed of the propeller body increases (for example, see Patent Document 1).

Japanese Patent No. 5030122

However, the cover is arranged radially outside the propeller body. As a result, the cover becomes large. As a result, there has been a problem that the propeller device for the generator becomes large in size.

The present invention has been made to solve the above problems, and an object thereof is to provide a generator propeller device that can be downsized.

A generator propeller device according to the present invention has a rotation center portion and a plurality of blades extending radially outward from the rotation center portion, and is rotatably provided with a first propeller, and a downstream from the first propeller. And a second propeller rotatably provided inside the cover in a radial direction . The cover has a radial dimension as it goes downstream from the first propeller. Are arranged such that the radial dimension at the downstream end of the cover is smaller than the radial dimension of the first propeller, which is the dimension from the central axis at the center of rotation to the radially outer portion of the blade. In addition, the ratio of the peripheral speed ratio of the first propeller to the diameter dimension of the first propeller matches the ratio of the peripheral speed ratio of the second propeller to the diameter dimension of the second propeller .

According to the generator propeller device of the present invention, the radial dimension of the cover is smaller than the radial dimension of the first propeller. As a result, the cover can be made smaller. As a result, the size of the generator propeller device can be reduced.

FIG. 1 is a front view showing a generator propeller device according to Embodiment 1 of the present invention. It is a side view which shows the propeller apparatus for generators of FIG. It is a side view which shows the modification of the cover of FIG. It is a side view which shows the modification of the cover of FIG. It is a front view which shows the propeller apparatus for generators which concerns on Embodiment 2 of this invention. It is a side view which shows the propeller apparatus for generators of FIG. It is a perspective view which shows the cover of FIG. It is a perspective view which shows the modification of the cover of FIG. It is a front view which shows the propeller apparatus for generators which concerns on Embodiment 3 of this invention. It is a side view which shows the propeller apparatus for generators of FIG. It is a front view which shows the propeller apparatus for generators which concerns on Embodiment 4 of this invention. It is a side view which shows the propeller apparatus for generators of FIG. It is a side view which shows the modification of the cover of FIG. It is a side view which shows the modification of the cover of FIG. It is a front view which shows the propeller apparatus for generators which concerns on Embodiment 5 of this invention. It is a side view which shows the propeller apparatus for generators of FIG. It is a front view which shows the propeller device for generators based on Embodiment 6 of this invention. It is a side view which shows the propeller apparatus for generators of FIG.

Embodiment 1.
1 is a front view showing a generator propeller device according to Embodiment 1 of the present invention, and FIG. 2 is a side view showing the generator propeller device shown in FIG. A generator propeller device converts the energy of a fluid stream into rotational energy. Examples of the fluid include air and water. The generator propeller device includes a first propeller 1 that is rotatably provided, and a cover 2 that extends downward from the first propeller 1. The first propeller 1 is connected to a rotating shaft of a generator (not shown). The first propeller 1 is arranged on the upstream side of the cover 2.

The first propeller 1 has a cylindrical rotation center 11 and three blades 12 provided in the rotation center 11. Hereinafter, the radial direction is the radial direction with respect to the rotation center portion 11. The circumferential direction is the circumferential direction of the rotation center 11. The axial direction is the axial direction of the rotation center 11. The blade 12 is fixed to the rotation center 11 so as to extend radially outward from the rotation center 11. The three blades 12 are arranged side by side at equal intervals in the circumferential direction. The first propeller 1 rotates in the circumferential direction. When the first propeller 1 rotates, the rotating shaft of the generator rotates. The rotating shaft of the generator is arranged so as to extend in the horizontal direction. In other words, the generator using the generator propeller device is a horizontal axis generator.

The cover 2 has a tapered shape. In other words, the cover 2 has a conical shape. The cover 2 is arranged so that the radial dimension increases from the first propeller 1 toward the downstream side. The side wall 21 of the cover 2 is formed such that its radial dimension increases at a constant rate from the upstream end toward the downstream end. The radial dimension L ₁ of the cover 2 is smaller than the radial dimension L ₂ of the first propeller 1. In this example, the radial dimension L ₁ of the cover 2 is the radial dimension at the downstream end of the cover 2.

The cover 2 is fixed to the first propeller 1 so that the central axis of the cover 2 and the central axis of the first propeller 1 are arranged on the same straight line. In other words, the cover 2 is arranged coaxially with the first propeller 1. As a method of fixing the first propeller 1 and the cover 2 to each other, a method of integrally forming the first propeller 1 and the cover 2 or a method of integrally forming the first propeller 1 and the cover 2 and then forming the cover 2 and the first propeller Examples of the method include bonding 1 and 1 to each other.

Next, the operation of the generator propeller device will be described. When the fluid flows from the upstream side of the cover 2 toward the downstream side of the cover 2, the fluid hits the first propeller 1. As a result, the first propeller 1 rotates. Since the cover 2 is fixed to the first propeller 1, the cover 2 rotates in synchronization with the first propeller 1. When the fluid flows along the side wall 21 of the cover 2, a negative pressure space is formed in the space downstream of the cover 2. As a result, the velocity of the fluid flowing inside the cover 2 in the radial direction increases. As a result, the rotation speed of the first propeller 1 increases.

As described above, according to the generator propeller device according to Embodiment 1 of the present invention, the radial dimension L ₁ of the cover 2 is smaller than the radial dimension L ₂ of the first propeller 1. As a result, the cover 2 can be made smaller. As a result, the size of the generator propeller device can be reduced.

The cover 2 is fixed to the first propeller 1. As a result, it is not necessary to install a column for supporting the cover 2. Therefore, the pressure fluctuation that occurs when the first propeller 1 passes near the support column is prevented. As a result, the efficiency of the generator propeller device can be improved.

Further, the cover 2 is arranged downstream of the first propeller 1, and the cover 2 is fixed to the first propeller 1. As a result, the cover 2 functions as a weathercock. Therefore, it is not necessary to newly install a weathercock. As a result, the size of the generator propeller device can be reduced.

Further, since the cover 2 functions as a weathercock, the direction in which the first propeller 1 faces can be easily made to follow the change in the flowing direction of the fluid. As a result, it is possible to suppress a decrease in the efficiency of the generator propeller device that occurs when the fluid flow direction changes.

Further, by fixing the cover 2 to the first propeller 1, the strength of the first propeller 1 can be improved. As a result, the first propeller 1 can be manufactured using an inexpensive material.

In addition, in the first embodiment, the configuration in which the cover 2 is formed in the tapered shape has been described. On the other hand, for example, as shown in FIG. 3, the side wall 21 of the cover 2 may be curved so that the axially intermediate portion of the side wall 21 of the cover 2 projects outward in the radial direction. Further, as shown in FIG. 4, the side wall 21 of the cover 2 may be curved so that the axially intermediate portion of the side wall 21 of the cover 2 projects radially inward.

Further, although the configuration in which the cover 2 is fixed to the first propeller 1 has been described in the first embodiment, the cover 2 may not be fixed to the first propeller 1. In this case, it is necessary to install a pillar that supports the cover 2.

Embodiment 2.
5 is a front view showing a generator propeller device according to Embodiment 2 of the present invention, FIG. 6 is a side view showing the generator propeller device of FIG. 5, and FIG. 7 is a cover of FIG. It is a perspective view. The cover 2 is formed with three slits 22 into which the blades 12 are fitted. The three slits 22 are arranged at equal intervals in the circumferential direction. The slit 22 is formed so as to extend straight from the upstream end of the cover 2 toward the downstream side. The cover 2 is fixed to the first propeller 1 by fitting the blade 12 into the slit 22. Other configurations are similar to those of the first embodiment.

As described above, according to the generator propeller device according to Embodiment 2 of the present invention, the cover 2 is fixed to the first propeller 1 by fitting the first propeller 1 into the slit 22. ing. Thereby, the dimension of the cover 2 in the axial direction can be reduced. As a result, the size of the generator propeller device can be reduced. Further, by fitting the first propeller 1 into the slit 22, the distance between the cover 2 and the first propeller 1 becomes short. Thereby, the air collection effect by the cover 2 can be improved.

In addition, in the second embodiment, the configuration in which the slit 22 is formed so as to extend straight from the upstream end portion of the cover 2 toward the downstream side has been described. Not limited to this, for example, as shown in FIG. 8, the slit 22 may be formed so as to extend in the circumferential direction from the upstream end of the cover 2 toward the downstream side.

Embodiment 3.
9 is a front view showing a generator propeller device according to Embodiment 3 of the present invention, and FIG. 10 is a side view showing the generator propeller device shown in FIG. The generator propeller device includes a rib 3 provided on the outer peripheral surface of the cover 2 on the downstream side. The rib 3 is formed to extend radially outward from the outer peripheral surface of the cover 2. The rib 3 is formed in an annular shape. Other configurations are similar to those of the second embodiment. Note that other configurations may be similar to those of the first embodiment.

As the fluid flows along the side walls 21 of the cover 2, the fluid flows along the ribs 3. Thereby, the negative pressure space formed in the space downstream of the cover 2 becomes larger. This further increases the velocity of the fluid flowing inside the cover 2 in the radial direction. As a result, the rotation speed of the first propeller 1 further increases.

As described above, according to the generator propeller device according to the third embodiment of the present invention, the rib 3 is provided on the outer peripheral surface of the cover 2 on the downstream side, and the rib 3 is the outer periphery of the cover 2. It is formed to extend radially outward from the surface. As a result, a larger negative pressure space can be formed in the space downstream of the cover 2. Therefore, the velocity of the air flowing inside the cover 2 can be further increased. As a result, the rotation speed of the propeller body can be further increased.

Further, the rib 3 is provided on the outer peripheral surface of the cover 2 on the downstream side portion. Thereby, the rib 3 functions as a weathercock. Therefore, the direction in which the first propeller 1 faces can be more easily made to follow the change in the direction in which the fluid flows. As a result, it is possible to more reliably suppress a decrease in the efficiency of the generator propeller device that occurs when the flow direction of the fluid changes.

Fourth Embodiment
11 is a front view showing a generator propeller device according to Embodiment 4 of the present invention, and FIG. 12 is a side view showing the generator propeller device shown in FIG. The cover 2 is formed in a cylindrical shape. The cover 2 is arranged so as to extend downstream from the first propeller 1. The cover 2 is fixed to the first propeller 1. The radial dimension L ₁ of the cover 2 is smaller than the radial dimension L ₂ of the first propeller 1. Other configurations are similar to those of the third embodiment. Note that other configurations may be similar to those of the first or second embodiment.

As described above, according to the generator propeller device according to the fourth embodiment of the present invention, the cover 2 is formed in a cylindrical shape. Thereby, the cover 2 can be easily manufactured. The radial dimension L ₁ of the cover 2 is smaller than the radial dimension L ₂ of the first propeller 1. As a result, the cover 2 can be made smaller. As a result, the size of the generator propeller device can be reduced.

In the fourth embodiment described above, the configuration in which the cover 2 is formed in the cylindrical shape has been described. On the other hand, for example, as shown in FIG. 13, the side wall 21 of the cover 2 may be curved so that the axially intermediate portion of the side wall 21 of the cover 2 projects outward in the radial direction. Further, as shown in FIG. 14, the side wall 21 of the cover 2 may be curved so that the axially intermediate portion of the side wall 21 of the cover 2 projects radially inward.

Embodiment 5.
15 is a front view showing a generator propeller device according to a fifth embodiment of the present invention, and FIG. 16 is a side view showing the generator propeller device shown in FIG. The generator propeller device fixes the second propeller 4 and the second propeller 4 provided on the downstream side of the first propeller 1 and radially inside the cover 2 to the first propeller 1. The fixing member 5 is provided.

The second propeller 4 has a rotation center portion 41 and three blades 42 provided on the rotation center portion 41. The rotation center portion 41 is arranged so as to overlap the rotation center portion 11 in the axial direction. The blade 42 is fixed to the rotation center portion 41 so as to extend outward from the rotation center portion 41 in the radial direction. The three blades 42 are arranged at equal intervals in the circumferential direction. The three blades 42 are arranged so as not to overlap the three blades 12 in the axial direction. In other words, the blades 42 are arranged between the blades 12 adjacent to each other in the circumferential direction when viewed in the axial direction. The blade 42 may be arranged so as to overlap the blade 12 when viewed in the axial direction. In other words, the position of blade 42 may be independent of the position of blade 12. Further, the number of blades 12 and the number of blades 42 are not limited to three, and may be other numbers.

The fixing member 5 has three bolts 51 penetrating the rotation center portion 11 and the rotation center portion 41, and three nuts 52 fitted to the three bolts 51 one by one. .. The second propeller 4 is fixed to the first propeller 1 by fitting the nut 52 to the bolt 51. As a result, the second propeller 4 rotates in synchronization with the first propeller 1. Further, by fixing the second propeller 4 to the first propeller 1, the second propeller 4 is also fixed to the cover 2. As a result, the second propeller 4 rotates in synchronization with the cover 2.

The first propeller 1 is a lift type propeller. The second propeller 4 is a drag type propeller. Lifting type propellers have small solidity and large peripheral speed ratio. Therefore, the lift type propeller is suitable for high speed rotation. Further, the lift type propeller can obtain a large amount of rotational energy. On the other hand, the drag propeller has a large solidity and a small peripheral speed ratio. Therefore, the drag propeller can obtain high torque at low speed rotation. Note that the drag propeller also generates torque during high-speed rotation. By using the first propeller 1 as a lift-type propeller and the second propeller 4 as a drag-type propeller, high torque can be obtained from the second propeller 4 when the fluid velocity is low, and the fluid velocity is high. In the case of speed, a large amount of rotational energy can be obtained from the first propeller 1. Further, the torque and the power of both the first propeller 1 and the second propeller 4 are summed up. Thereby, the efficiency of the generator propeller device can be improved.

The ratio of the diameter dimension between the first propeller 1 and the second propeller 4 and the ratio of the peripheral speed ratio between the first propeller 1 and the second propeller 4 are designed to be equal to each other. In other words, the ratio of the peripheral speed ratio of the first propeller 1 to the diameter dimension of the first propeller 1 matches the ratio of the peripheral speed ratio of the second propeller 4 to the diameter dimension of the second propeller 4. The peripheral speed ratio λ is expressed by the following equation (1). Here, V _p is the rotational speed (m/s) of the tip of the propeller, and V _w is the speed (m/s) of the fluid.

λ=V _p /V _w (1)

The rotation speed N of the propeller is expressed by the following equation (2). Here, D is the diameter dimension of the propeller.

N=V _p /(πD) (2)

The following equation (3) is obtained from the above equation (1) and the above equation (2).

N=V _w ·λ/(πD) (3)

Since the first propeller 1 and the second propeller 4 are fixed to each other, the first propeller 1 and the second propeller 4 rotate in synchronization with each other. Therefore, the rotation speed of the first propeller 1 and the rotation speed of the second propeller 4 match each other. If the diameter dimension of the first propeller 1 is D ₁ , the peripheral speed ratio of the first propeller 1 is λ ₁ , the diameter dimension of the second propeller 4 is D _2, and the peripheral speed ratio of the second propeller 4 is λ _2. , The following equation (4) is obtained.

V _w ·λ ₁ /(πD ₁ )=V _w ·λ ₂ /(πD ₂ ) (4)

The following equation (5) is obtained from the above equation (4).

λ ₁ /D ₁ =λ ₂ /D ₂ (5)

By designing the first propeller 1 and the second propeller 4 so as to satisfy the above equation (5), both the first propeller 1 and the second propeller 4 obtain the maximum efficiency at the same fluid velocity. Other configurations are similar to those of the third embodiment. The rest of the configuration may be the same as in any of the first, second and fourth embodiments.

As described above, according to the generator propeller device according to the fifth embodiment of the present invention, the second propeller 4 is rotatably provided inside the cover 2 in the radial direction. As a result, the rotating shaft of the generator can be rotated using the torque generated in the second propeller 4 in addition to the torque generated in the first propeller 1. As a result, the efficiency of the generator propeller device can be improved.

Further, the second propeller 4 rotates in synchronization with the first propeller 1. As a result, the blade 12 and the blade 42 can be prevented from overlapping each other in the axial direction. As a result, the efficiency of the generator propeller device can be improved.

The first propeller 1 is a lift type propeller, and the second propeller 4 is a drag type propeller. Thereby, high torque can be obtained when the fluid velocity is low, and large rotational energy can be obtained when the fluid velocity is high.

The ratio of the peripheral speed ratio λ ₁ of the first propeller 1 to the diameter dimension D ₁ of the first propeller 1 matches the ratio of the peripheral speed ratio λ ₂ of the second propeller 4 to the diameter dimension D ₂ of the second propeller 4. This allows both the first propeller 1 and the second propeller 4 to obtain maximum efficiency at the same fluid velocity.

In addition, in the said 5th Embodiment, the structure where the 1st propeller 1 was arrange|positioned rather than the 2nd propeller 4 was demonstrated. On the other hand, the second propeller 4 may be arranged on the upstream side of the first propeller 1.

Further, in the fifth embodiment, the configuration in which the second propeller 4 is fixed to the first propeller 1 has been described. On the other hand, the second propeller 4 may be fixed to the inner peripheral surface of the side wall 21 of the cover 2. In this case, the strength of the second propeller 4 can be improved. As a result, the second propeller 4 can be manufactured using an inexpensive material. As a method of fixing the second propeller 4 and the cover 2 to each other, a method of integrally forming the second propeller 4 and the cover 2, or a method of forming the second propeller 4 and the cover 2 separately, and then forming the second propeller 4 and the cover 2 The method of adhering 2 and 2 etc. is mentioned.

Further, in the fifth embodiment, the configuration in which the second propeller 4 is the drag type propeller has been described. On the other hand, the second propeller 4 may be a lift type propeller. Even in this case, the torque and the power of both the first propeller 1 and the second propeller 4 are summed up.

Sixth embodiment.
17 is a front view showing a generator propeller device according to Embodiment 6 of the present invention, and FIG. 18 is a side view showing the generator propeller device shown in FIG. In the propeller device for a generator, the first propeller 6 is fixed to the outer peripheral surface of the side wall 21 of the cover 2. The first propeller 6 is composed of three blades 61. The three blades 61 are formed to extend radially outward from the outer peripheral surface of the cover 2. The three blades 61 are arranged side by side at equal intervals in the circumferential direction. The first propeller 6 is not provided inside the cover 2 in the radial direction. Other configurations are similar to those of the fifth embodiment. Note that the other configurations may be the same as any of the first to fourth embodiments.

As described above, according to the generator propeller device according to the sixth embodiment of the present invention, the first propeller 6 is provided on the outer peripheral surface of the side wall 21 of the cover 2, and from the outer peripheral surface of the cover 2. It is formed so as to extend radially outward. Thereby, the interference of the flowing fluid can be prevented between the first propeller 6 and the second propeller 4. As a result, the efficiency of the generator propeller device can be improved.

When the first propeller 1 and the second propeller 4 are arranged radially inward of the cover 2 as in the fifth embodiment, the turbulence of the fluid flow generated by the first propeller 1 causes The inflow angle of the fluid flow toward the propeller 4 may change. In this case, the efficiency of the second propeller 4 may be reduced. On the other hand, in the sixth embodiment, since the first propeller 6 is arranged on the outer side in the radial direction of the cover 2, the efficiency of the second propeller 4 can be improved.

1 1st propeller, 2 cover, 3 ribs, 4 2nd propeller, 5 fixing member, 6 1st propeller, 11 rotation center part, 12 blades, 21 side wall, 22 slits, 41 rotation center part, 42 blades, 51 bolts, 52 nuts, 61 wings.

Claims (8)

A first propeller rotatably provided, having a rotation center and a plurality of blades extending radially outward from the rotation center;
A cover that is provided to extend downstream from the first propeller and that is formed in a tapered shape;
A second propeller rotatably provided on the inner side in the radial direction of the cover,
The cover is arranged so that the radial dimension increases toward the downstream from the first propeller,
The radial dimension at the downstream end of the cover is smaller than the radial dimension of the first propeller, which is the dimension from the central axis at the center of rotation to the radially outer portion of the blade,
The generator propeller device wherein the ratio of the peripheral speed ratio of the first propeller to the diameter dimension of the first propeller matches the ratio of the peripheral speed ratio of the second propeller to the diameter dimension of the second propeller. The generator propeller device according to claim 1, further comprising a rib that is provided on an outer peripheral surface of the cover on a downstream side and that extends radially outward from the outer peripheral surface of the cover. A first propeller rotatably provided, having a rotation center and a plurality of blades extending radially outward from the rotation center;
Provided to extend toward the downstream from said first propeller, a cover formed into a cylindrical shape,
Ribs that are provided on the downstream side of the outer peripheral surface of the cover and that extend radially outward from the outer peripheral surface of the cover;
A second propeller rotatably provided on the inner side in the radial direction of the cover,
The radial dimension of the cover is smaller than the radial dimension of the first propeller, which is the dimension from the central axis of the rotation center portion to the radially outer portion of the blade,
The generator propeller device wherein the ratio of the peripheral speed ratio of the first propeller to the diameter dimension of the first propeller matches the ratio of the peripheral speed ratio of the second propeller to the diameter dimension of the second propeller. The generator propeller device according to any one of claims 1 to 3, wherein the cover is fixed to the first propeller. The cover is formed with a slit into which the first propeller is fitted,
The generator propeller device according to claim 4, wherein the cover is fixed to the first propeller by fitting the first propeller into the slit. The propeller device for a generator according to any one of claims 1 to 5, wherein the second propeller is fixed to the cover. The propeller device for a generator according to any one of claims 1 to 6, wherein the second propeller rotates in synchronization with the first propeller. The generator propeller device according to any one of claims 1 to 7, wherein the first propeller is a lift-type propeller, and the second propeller is a drag-type propeller.

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