JP2002242811A - Axial flow hydraulic turbine generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an equipment installation space and a cost by installing a generator at the outside of a flow passage considering a maintenance, and adopting a structure in which a transmission performance and a life are not impaired. SOLUTION: After water flowing between an inner cylinder 12 and an outer cylinder 13 of an axial flow hydraulic turbine is straightened by a fixed guide vane 2, it passes through a rotary impeller 3 and rotates a rotary impeller shaft 4. After a shaft power of the rotary impeller shaft 4 is transmitted to a sprocket 15a, it is transmitted to a sprocket 15b at the outside of a flow passage by a chain 11 passed through a chain passing pipe 14 connecting the inner cylinder 12 and the outer cylinder 13, and it is also transmitted to a rotation shaft of a generator 7 through a transmission 9. In this case, a height position of the sprocket 15b can be adjusted by circularly moving the transmission 9 on a rotation shaft 9c as a center. Thereby, a tension of the chain (or a belt) can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an axial turbine generator for transmitting power from an axial turbine to a generator.

[0002]

2. Description of the Related Art Generally, the power of an axial-flow turbine power generator is extracted from the shaft power of a rotary impeller installed in a flow passage. This shaft power is transmitted to the generator installed in the flow path, or the shaft power is transmitted to the generator installed outside the flow path by passing the rotating impeller shaft through running water and out of the flow path. It has become so.

FIG. 8 is a diagram conceptually showing a typical S-type tubular turbine power generator. In this example, the rotary impeller shaft 3 is made to penetrate out of the flow path through flowing water, and the power is transmitted to the generator.

[0004] Water flowing into the casing 1 from an upper pond (not shown) is rectified by fixed guide blades 2 and then rotated by a rotating impeller 3.
To rotate the rotary impeller shaft 4. Thereafter, the water flows into the suction pipe 5 bent into an S shape, and flows out to a lower pond (not shown).

[0005] The rotary impeller shaft 4 passes through the suction pipe 5 bent in an S-shape through flowing water to the outside of the flow path, and its power is transmitted to the generator 7 via the speed increasing device 6. The speed increasing device 6
Is provided for the purpose of increasing the rotation speed and for the purpose of reducing the size and cost of the generator 7.

[0006]

However, in the above-described conventional axial-flow turbine power generator, the generator is installed outside the flow path in consideration of maintainability, so that the suction pipe is bent into an S-shape. It requires considerable equipment installation space and increases the number of bearings due to the longer power shaft.
It becomes necessary to make the shaft thicker, and the cost becomes higher in terms of equipment cost and civil engineering cost.

There is also an example of a tubular turbine power generator in which a generator is installed in the flow passage. However, in this case, advanced water sealing technology is required, and maintenance of the generator installed in the flow passage is considered. This results in a complicated device structure and high cost.

The present invention has been made in view of the above-mentioned circumstances, and employs a structure in which a generator is installed outside a flow path in consideration of maintenance, and a structure that does not deteriorate transmission performance or shorten life is adopted.
An object of the present invention is to provide an axial-flow turbine power generation device that reduces equipment installation space and cost.

[0009]

Means for Solving the Problems To solve the above-mentioned problems, an axial flow turbine generator according to the present invention comprises an outer cylinder having a flow path formed therein, and a rotary impeller provided in the flow path. And an inner cylinder including a first rotating shaft that supports the rotating impeller, wherein the power from the axial-flow turbine is transmitted to the rotating shaft of the generator. Two pipes provided on the flow side and penetrating between the inner cylinder and the outer cylinder, and provided outside the axial-flow turbine to transmit power from the axial-flow turbine to the rotating shaft of the generator; A second rotating shaft, a first sprocket attached to the first rotating shaft, a second sprocket attached to the second rotating shaft, and the first sprocket through the two pipes. A chain for transmitting power from the sprocket to the second sprocket. It is characterized in.

[0010] The axial-flow turbine power generating apparatus according to the present invention comprises:
Power is generated from an axial flow turbine having an outer cylinder having a flow path formed therein, a rotary impeller provided in the flow path, and an inner cylinder including a first rotary shaft supporting the rotary impeller. An axial flow turbine generator for transmitting power to a rotating shaft of a turbine, wherein one pipe provided between the inner cylinder and the outer cylinder is provided upstream of the rotary impeller and extends between the inner cylinder and the outer cylinder; A second rotating shaft that is provided outside of the shaft and transmits power from the axial-flow turbine to the rotating shaft of the generator; a first pulley attached to the first rotating shaft; A second pulley attached to a rotating shaft, and a belt for transmitting power from the first pulley to the second pulley through the one pipe are provided.

As a result, the chain or the belt does not come into contact with the working fluid, and the power can be transmitted to the outside of the flow path without deterioration in performance and life and damage caused by poor lubrication due to contact with the working fluid. It is possible to install outside the channel considering the maintenance of the generator,
The entire apparatus can be made compact, the equipment cost can be reduced, the installation space can be significantly reduced, and the building and civil engineering costs can be greatly improved.

The axial-flow turbine generator includes a transmission having a gear for transmitting power from the second rotating shaft to the rotating shaft of the generator; the second rotating shaft and the rotating shaft of the generator; For adjusting the tension of the chain or the belt by moving the transmission such that the second rotating shaft makes a circular motion about the rotating shaft of the generator while keeping the distance between the shafts constant. An adjusting device may be further provided.

This facilitates the adjustment of the power transmission mechanism and the adjustment of the elongation of the chain or the belt.

[0014] In the axial flow turbine power generator, the transmission may include a plurality of gears having different numbers of teeth combined with each other.

[0015] This makes it possible to combine and install gears having different numbers of teeth corresponding to the distance between the gear shafts. The speed and the rotation speed of the generator can be set to the optimum rotation speed. Accordingly, high efficiency and stable operation can be provided, and the transmission can be standardly designed for specifications with different heads and flow rates only by replacing gears, so that equipment costs can be significantly reduced.

In the axial-flow turbine power generator, the first
The first sprocket or the first pulley is mounted in a cantilever state with respect to the first rotating shaft, and as a bearing of the first rotating shaft in the inner cylinder, a roller bearing is provided on the first sprocket side. The rotary impeller may include a tapered roller bearing arranged on the back or front face.

With this arrangement, the tension of the chain or the belt can be efficiently shared by the roller bearings, and the large thrust force generated by the rotating impeller in the direction of flowing water and in the direction opposite to the flowing water can be efficiently shared by the tapered roller bearings in the rear or front face. A compact bearing configuration becomes possible, and a large cost reduction can be achieved by making the entire device compact. In addition, by disposing the bearings in the simultaneously processed inner cylinder, assembly in which the center of each bearing is the same is facilitated, shaft vibration can be suppressed to the maximum, and stable operation can be realized.

In the axial-flow turbine power generator, the second
The second sprocket or the second pulley is mounted in a cantilever state with respect to the second rotating shaft, and the bearing of the second rotating shaft in the transmission is provided at positions on both sides of the gear. Good.

Thus, the load of the chain or the belt can be shared by the bearings on both sides of the gear, and the sprocket or the pulley connected to the chain or the belt can be stably made cantilevered. Compactness can be achieved, and equipment costs can be significantly reduced.

[0020]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view showing a configuration of an axial-flow turbine power generation device according to an embodiment of the present invention. Elements common to those in FIG. 8 are denoted by the same reference numerals.

The axial turbine in the axial turbine generator is as follows.
A casing 1, fixed guide blades 2, rotary impeller 3, rotary blade axle 4, suction pipe 5, and the like are provided. In addition to the above, the axial flow turbine power generator is provided with a generator 7, a transmission device 8, a transmission 9, a tension adjusting device 10, and the like.

The casing 1 receives flowing water. The casing 1 has a flow path formed by the inner cylinder 12 and the outer cylinder 13.
Will flow through the space between

The fixed guide vanes 2 straighten the water flowing into the casing 1. The rotating impeller 3 is rotated by the water rectified by the fixed guide blades 2, and its power is transmitted to the rotating impeller shaft 4.
To communicate. The rotating impeller shaft 4 supports the rotating impeller 3, and rotates when the rotating impeller 3 is rotated.

The suction pipe 5 is a part from which water after passing through the rotary impeller 3 flows out. The generator 7 generates electric power based on the power transmitted from the axial-flow turbine via the rotating shaft. The generator 7 does not need to be disposed directly above the axial flow turbine, and may be disposed directly beside or directly below depending on the installation location. In consideration of this, it is desirable to provide it above the axial flow turbine.

The transmission device 8 has a chain or a belt, and transmits the shaft power of the rotary impeller shaft 4 to the rotary shaft 9 b connected to the gear of the transmission 9. In the present embodiment,
The transmission device 8 is provided on the flow path upstream side of the fixed guide blade 2 and the rotary impeller 3. If the transmission device 8 is provided downstream of the fixed guide blades 2 and the rotary impeller 3, the transmission device 8 will impede the flow of water and reduce the efficiency.

The transmission 9 converts the power transmitted to the rotating shaft 9b into power matching the rotation speed of the rotating shaft (generator shaft) of the generator 7, and transmits the power to the rotating shaft 9c. The power of the rotating shaft 9c is
It is transmitted to the generator shaft.

The tension adjusting device 10 supports the transmission 9,
By moving the transmission 9, the height position of the rotating shaft 9b is adjusted, and thus, it is used to adjust the tension of the chain or the belt.

Next, the operation of the present axial-flow turbine generator shown in FIG. 1 will be described. Water flowing into the casing 1 from the upper pond (not shown) is rectified by the fixed guide blades 2, passes through the rotary impeller 3, and rotates the rotary impeller shaft 4. After this,
The water flows into the suction pipe 5 and flows out to a lower pond (not shown). On the other hand, the shaft power of the rotary impeller shaft 4 is
The power is transmitted to a rotating shaft 9b connected to a gear of the transmission 9.
The height position of the rotating shaft 9b is determined by the tension adjusting device 10
The transmission 9 is adjusted in advance by moving the transmission 9, whereby the tension of the chain or the belt is adjusted. The power transmitted to the rotating shaft 9b is converted by the transmission 9 into power matching the rotating speed of the rotating shaft of the generator 7, and transmitted to the rotating shaft 9c. The power of the rotating shaft 9c is generated by the generator 7
And the generator 7 is driven.

FIG. 2 is a view of a cross section (when a chain is employed) near the transmission device 8 shown in FIG. 1 as viewed from the upstream side of flowing water.

In this embodiment, the chain 11 passes through two chain passage pipes 14 connecting the inner cylinder 12 and the outer cylinder 13 constituting the casing 1 and is located upstream of the rotary impeller 3 in the flow path. The output of the sprocket 15 a in the inner cylinder 12 connected to the end is transmitted to the sprocket 15 b outside the flow path, and the generator 7 is driven via the transmission 9.

The chain 11 has a detachable connecting portion at a part thereof. When the chain 11 is mounted, the connecting portion is cut off from one of the two chain through pipes 14 in a state where the connecting portion is cut off.
After inserting 1 and hooking it on the sprocket 15a, it may be taken out from the other chain through pipe.

FIG. 3 shows a modification of FIG.
A belt 21 is employed in place of the belt 21. In this case, instead of the sprockets 15a, 15b, pulleys 25a, 25
b is used. Since the belt 21 has no detachable connecting portion, a single belt passage tube 24 is required when the belt 21 is worn.
The belt 21 is inserted from above, and the belt 21 is hung on the pulley 25a.

According to such a configuration, the chain or the belt does not come into contact with the working fluid, and the power and the power are transmitted to the outside of the flow path without deterioration in performance and life and damage due to poor lubrication caused by contact with the working fluid. Can be installed outside the flow path in consideration of the maintenance of the generator.In addition, the equipment can be made more compact, the equipment cost can be reduced, the installation space can be significantly reduced, and the building and civil engineering costs can be significantly reduced. Can be improved.

FIG. 4A is a view of the vicinity of the tension adjusting device 9 shown in FIGS. 1 and 2 as viewed from the upstream side. Also,
FIG. 4B is a view of the vicinity of the same tension adjusting device 9 as viewed from above.

In this embodiment, the transmission 9 is supported by a transmission support bracket 16 and a tension adjusting device 10, and is fixed by a nut 9a and two nuts 10a.

The power from the axial-flow turbine is transmitted from the rotating shaft 9b connected to the sprocket 15b for the chain 11 to the generator via the transmission 9 and the rotating shaft 9c. The transmission 9 is provided with gears 9c and 9e (described later) for transmitting power from the rotating shaft 9b to the rotating shaft 9c.

By loosening the nut 9a and the nut 10a, the shaft fixed to the nut 10a can be slid up and down, and the transmission 9 is rotated by the rotating shaft 9c on the generator side.
And a circular motion centered on the transmission 9
The sprocket 15b and the chain 11 connected to the rotating shaft 9b can also move up and down by circular motion.

According to such a configuration, the distance between the shafts of the sprocket 15a in the inner cylinder and the sprocket 15b outside the flow passage can be easily adjusted, so that it is not necessary to adjust the generator level at the time of initial assembly, and the assembling work can be performed. The time can be greatly reduced, and the elongation of the chain caused by long-time operation can be adjusted in a short time.

FIG. 5 is a view of a cross section of the transmission 9 as viewed from the upstream side of the flow passage.

In this embodiment, the transmission 9 is shifted by a gear 9d connected to the turbine-side rotating shaft 9b and a gear 9e connected to the generator-side rotating shaft 9c.

The power of the rotating shaft 9b is transmitted from the gear 9d to the gear 9d.
e is transmitted at a predetermined gear ratio, and the shifted power is transmitted to the rotating shaft 9c.

According to such a configuration, it is possible to arrange gear trains having different numbers of teeth while keeping the distance between the rotating shaft 9b and the rotating shaft 9c constant. By selecting a necessary combination from among the above, the rotation speed of the water turbine and the rotation speed of the generator can be set to the optimum rotation speed. Accordingly, high efficiency and stable operation can be provided, and the transmission can be standardly designed for specifications with different heads and flow rates only by replacing gears, so that equipment costs can be significantly reduced. In addition, gears can be easily replaced under conditions where the head and the flow rate change periodically in each season, and highly efficient and stable operation can be realized.

FIG. 6 is a sectional view of the axial-flow turbine shown in FIG. 1 and shows a bearing arrangement around the blade rotating shaft 4.

In this embodiment, a bearing for supporting the blade rotating shaft 4 is provided in the inner cylinder 12. More specifically, as shown in the figure, a roller bearing 17 is provided on the sprocket 15a side, and a tapered roller bearing 18 is provided on the rotating impeller 3 side in front-to-front (or back-to-back) alignment.

When the chain 11 is employed for the transmission device 8, the seal member 31 is not provided and the lubricating oil is supplied to the inner cylinder 1
The lubricating oil is soaked so that the chain 11 is slightly immersed in 2. On the other hand, the belt 21 is
Is adopted, a seal member 31 is provided so that lubricating oil does not enter the belt 21 side, and lubricating oil is put in the bearing side in the inner cylinder 12.

According to such a configuration, the tension of the chain 11 or the belt 21 is reduced by the roller bearing 17 and the rotating impeller 3.
A large thrust force in the flowing water direction and in the opposite direction to the flowing water generated in the above can be efficiently shared by the tapered roller bearings 18 which are face-to-face (or face-to-face), so that a compact bearing configuration is possible and the entire equipment is made compact. Significant cost reduction can be achieved. In addition, by disposing the bearings in the inner cylinder 12 that has been simultaneously machined, assembly in which the centers of the bearings are the same becomes easy, shaft vibration can be suppressed to the maximum, and stable operation can be realized.

FIG. 7 is a sectional view of the transmission 9 shown in FIG. 1 and shows the bearing arrangement around the rotation shaft 9b.

In this embodiment, the bearing for supporting the rotating shaft 9b is arranged in the transmission 9, and the tapered roller bearing 19 is arranged in front of each side of the gear 9d, and the sprocket 15b is supported in a cantilever manner. Have been. Note that a normal roller bearing may be used instead of the tapered roller bearing.

According to such a configuration, the tension of the chain 11 can be shared by the tapered roller bearings 19, and the sprocket 15 connected to the chain 11 can be stably cantilevered. Can be downsized, and equipment costs can be significantly reduced.

It should be noted that the present invention is not limited to the above-described embodiments, but can be implemented with various modifications within the scope of the invention.

[0051]

As described above in detail, according to the present invention, the generator is installed outside the flow path in consideration of maintenance, and a structure that does not deteriorate the transmission performance or shorten the life is adopted, and the space for installing the equipment and the cost are reduced. And an axial-flow turbine power generation device that reduces the amount of water can be provided.

In addition, an inexpensive axial flow turbine power generator which is compactly designed with standard specifications can be provided, can cope with various head and flow specifications, and can improve production efficiency by mass production. The device can be installed in places where water turbines could not be installed for profitable reasons.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of an axial-flow turbine power generator according to an embodiment of the present invention.

FIG. 2 is a view of a cross section (when a chain is employed) near the transmission device shown in FIG. 1 as viewed from an upstream side of flowing water.

FIG. 3 is a view of a cross section (when a belt is used) near the transmission device shown in FIG.

FIG. 4 is a view of the vicinity of the tension adjusting device shown in FIGS. 1 and 2 as viewed from the upstream side, and a view of the vicinity of the tension adjusting device as viewed from above.

FIG. 5 is a view of a cross section of the transmission shown in FIG. 1 as viewed from an upstream side of a flow passage.

FIG. 6 is a sectional view of the axial flow turbine shown in FIG. 1;

FIG. 7 is a sectional view of the transmission shown in FIG. 1;

FIG. 8 is a diagram conceptually showing a conventional typical S-type tubular turbine power generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Fixed guide impeller 3 ... Rotating impeller 4 ... Rotating impeller shaft 5 ... Suction pipe 6 ... Speed increasing device 7 ... Generator 8 ... Transmission device 9 ... Transmission 9a ... Nut 9b ... Rotating shaft 9c ... Rotating shaft 9d ... gear 9e ... gear 10 ... tension adjusting device 10a ... nut 11 ... chain 12 ... inner cylinder 13 ... outer cylinder 14 ... chain through pipe 15a, 15b ... sprocket 16 ... transmission support bracket 17 ... roller bearing 18 ... tapered roller bearing 19 ... taper roller bearing 21 ... belt 24 ... belt passage pipe 25a, 25b ... pulley 31 ... seal member

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masahiko Nakazono 66-2 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Toshiba Engineering Co., Ltd. (72) Inventor Hideo Sugishita 2-chome Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa No. 4 Toshiba Keihin Works Co., Ltd. (72) Norio Otake 2-4, Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture F-term (reference) 3H072 AA09 BB01 BB06 BB07 CC01 CC42 CC71

Claims (6)

[Claims] An axial flow turbine having an outer cylinder having a flow path formed therein, a rotary impeller provided in the flow path, and an inner cylinder including a first rotary shaft supporting the rotary impeller. An axial-flow turbine power generator that transmits power from the generator to a rotating shaft of a generator, comprising two pipes provided upstream of the rotary impeller in the flow path and penetrating between the inner cylinder and the outer cylinder. A second rotating shaft that is provided outside the axial-flow turbine and transmits power from the axial-flow turbine to the rotating shaft of the generator; and a first sprocket attached to the first rotating shaft. A shaft comprising: a second sprocket attached to the second rotating shaft; and a chain that transmits power from the first sprocket to the second sprocket through the two pipes. Running water generator. 2. An axial flow turbine having an outer cylinder having a flow path formed therein, a rotary impeller provided in the flow path, and an inner cylinder including a first rotary shaft supporting the rotary impeller. An axial flow turbine generator for transmitting power from the generator to a rotating shaft of the generator, wherein one pipe is provided upstream of the rotary impeller in the flow path and penetrates between the inner cylinder and the outer cylinder. A second rotary shaft provided outside the axial turbine and transmitting power from the axial turbine to a rotary shaft of the generator; a first pulley attached to the first rotary shaft; A shaft comprising: a second pulley attached to the second rotating shaft; and a belt for transmitting power from the first pulley to the second pulley through the one pipe. Running water generator. 3. A transmission having a gear for transmitting power from the second rotating shaft to the rotating shaft of the generator, and a constant inter-axis distance between the second rotating shaft and the rotating shaft of the generator. And an adjusting device for adjusting the tension of the chain or the belt by moving the transmission such that the second rotating shaft circularly moves around the rotating shaft of the generator while maintaining the tension. The axial-flow turbine power generator according to claim 1 or 2, wherein: 4. The transmission according to claim 3, wherein the transmission includes a plurality of gears having different numbers of teeth combined with each other.
An axial flow turbine generator according to any of the preceding claims. 5. The first sprocket or the first pulley is mounted in a cantilever state with respect to the first rotating shaft, and the first sprocket or the first pulley is used as a bearing of the first rotating shaft in the inner cylinder. The axial-flow turbine power generator according to claim 1 or 2, further comprising a roller bearing on the sprocket side and a tapered roller bearing disposed on the back or front face side on the rotary impeller side. 6. The second sprocket or the second pulley is mounted in a cantilever state with respect to the second rotating shaft, and a bearing of the second rotating shaft in the transmission is connected to the gear. 4. The axial-flow turbine power generator according to claim 3, wherein the power generator is provided at both sides.