JP2016156349A - Moving vane operation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moving vane operation device capable of further simply carrying out work such as maintenance, with a simple structure.SOLUTION: A moving vane operation device is equipped with: a link mechanism which rotates a moving vane; an operation rod coupled to the link mechanism, rotated with a rotary shaft, and capable of moving in an axial direction; and an axial direction moving device which moves the operation rod in the axial direction. The operation rod projects out to an end portion on a vertical direction upper side than a main shaft. The axial direction moving device has: an operation liquid cylinder which is equipped with a piston disposed at an end portion on the opposite side to an end portion at which the link mechanism of the operation rod is installed, rotated with the operation rod, and coupled to the operation rod, and a cylinder on which the piston is disposed; a shaft joint which is connected to the operation liquid cylinder, has a rotary portion rotated with the operation liquid cylinder and a supporting portion rotatably supporting the rotary portion, and is formed with a conduit circulating an operation liquid between the rotary portion and the supporting portion; and an operation liquid supply device capable of supplying the operation liquid to both sides of the piston of the cylinder through the shaft joint.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a movable blade operating device that adjusts the position of a movable blade of a hydraulic machine having movable blades.

  Hydropower machines include movable wing type hydraulic machines having impellers having movable blades such as Kaplan turbines and mixed flow turbines. A hydraulic machine having movable blades has a movable blade operation device that rotates the movable blades of the impeller and adjusts the opening thereof. The movable blade operating device is a mechanism that uses an operation liquid, operates the linear motion mechanism, converts the movement of the linear motion mechanism in the linear motion direction into movement in the rotational direction by the link mechanism, and transmits it to the impeller. Rotate the movable wing.

  In Patent Document 1, as a hydraulic machine having a movable blade operating device, a movable blade (movable blade), a movable blade holding portion that rotatably holds the movable blade, and a link that causes the movable blade to perform a rotating operation. An impeller having a mechanism, a rotating shaft integrally coupled to the impeller and rotatably supported, and a rotating operation of the movable blade through a link mechanism formed by using a part of the rotating shaft A hydraulic operating device that performs operation with an operating fluid, a pump device that is mounted on a rotating shaft and supplies operating fluid, and an operating fluid that is mounted on the rotating shaft and used to supply operating fluid from the pump device to the hydraulic operating device There is described a hydraulic machine including a pipe and mounting all the parts through which an operation liquid flows on a rotating shaft. In addition, as the movable blade operating device, a hydraulic pressure supply device that supplies the operating fluid is arranged in a stationary part, and the hydraulic pressure is supplied by the hydraulic pressure supply device to operate the link mechanism in the middle of the rotating shaft or There is a device arranged in the movable blade holder.

Japanese Patent No. 4565732

  The movable wing operating device of a hydraulic machine is provided with a path for supplying operating fluid to the inside of the main shaft. Replacement of parts and repairs will occur. For this reason, it takes time and labor for maintenance. Further, a path for supplying the operation liquid into the main shaft is provided in the operation rod inserted into the main shaft or the main shaft.

  The present invention has been made in view of the above, and an object thereof is to provide a movable blade operating device having a simple structure and capable of performing operations such as maintenance more easily.

  In order to solve the above-described problems and achieve the object, the present invention is a movable blade position operating device for operating the position of a movable blade of a hydraulic machine, and is connected to the movable blade and rotates the movable blade. A link mechanism that is inserted into the main shaft of the hydraulic machine, is connected to the link mechanism, rotates together with the main shaft, and is movable in the axial direction, and moves the operation rod in the axial direction The operation rod protrudes from the end on the upper side in the vertical direction with respect to the main shaft, and the axial movement device has an end on which the link mechanism of the operation rod is installed. An operation liquid cylinder that is disposed at an end opposite to the part, rotates together with the operation rod, and includes a piston connected to the operation rod and a cylinder in which the piston is disposed; and the operation liquid cylinder A pipeline that is continued, has a rotating part that rotates with the operating liquid cylinder, and a supporting part that supports the rotating part in a rotatable state, and allows the operating liquid to flow between the rotating part and the supporting part; It has a formed shaft coupling, and an operating fluid supply device which can supply an operating fluid to both sides of the piston of the cylinder via the shaft coupling.

  Further, in the hydraulic machine, a generator whose rotating part rotates together with the main shaft is arranged above the movable blade in the vertical direction, and the main shaft protrudes at an end portion in the vertical direction higher than the generator. Is preferred.

  The operating fluid supply device includes a pipe connected to a fixed portion of the shaft coupling, a pump capable of switching a path for supplying the operating fluid, and a motor for driving the pump, and the piping It is preferable to form an operating fluid circuit with the cylinder and the pump.

  Moreover, it is preferable that the operating fluid supply device supplies operating fluid having a pressure of 13 MPa or more to the cylinder.

  The present invention has an effect of having a simple structure and capable of more easily performing operations such as maintenance.

FIG. 1 is a schematic diagram illustrating a schematic configuration of a hydroelectric generator. FIG. 2 is an enlarged schematic view of a part of the runner operating device of the hydroelectric generator shown in FIG.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the following modes for carrying out the invention (hereinafter referred to as embodiments). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined.

  FIG. 1 is a schematic diagram illustrating a schematic configuration of a hydroelectric generator. The hydroelectric generator 5 shown in FIG. 1 is disposed on the generator floor 2. The hydroelectric generator 5 includes a generator 6 and a hydraulic machine 10 that rotates the generator 6. The generator 6 is installed on the generator floor 2. The generator 6 includes a stationary part 7 that is stationary with respect to the generator floor 2 and a rotating part 8 that rotates with respect to the stationary part 7. The generator 6 generates power when the rotating unit 8 rotates with respect to the stationary unit 7. The generator 6 is connected to the hydraulic machine 10 through the rotating part 8 and the main shaft 12. The hydraulic machine 10 is supported by the rotating unit 8 of the generator 6 and rotates together with the rotating unit 8. Further, a part of the hydraulic machine 10 does not rotate like the stationary part 7.

  Next, the hydraulic machine 10 will be described with reference to FIG. 2 in addition to FIG. FIG. 2 is an enlarged schematic view of a part of the runner operating device of the hydroelectric generator shown in FIG. The hydraulic machine 10 of this embodiment is a Kaplan turbine. The hydraulic machine 10 includes a main shaft (rotary shaft, generator shaft) 12, a runner vane 14, a runner boss 16, and a runner operation device 20. Further, the hydraulic machine 10 may further arrange guide vanes on the upstream side of the runner vanes 14 in the water channel 4.

  The hydraulic machine 10 of the present embodiment has a main shaft 12 installed along the vertical direction, and rotates around the axis about the vertical direction while being connected to the rotating unit 8 of the generator 6 through the main shaft 12. The main shaft 12 has an end portion on the upper side in the vertical direction that protrudes upward in the vertical direction from an end surface on the upper side in the vertical direction of the generator 6. The main shaft 12 is a hollow shaft.

  The runner vanes 14 are disposed in the water channel 4 at the end of the main shaft 12 on the lower side in the vertical direction. A plurality of runner vanes 14 are arranged in the rotational direction. The runner boss 16 is disposed at the lower end of the main shaft 12 in the vertical direction, and supports the runner vane 14 in a rotatable state.

  The runner operation device 20 is a device that rotates the runner vane 14 and adjusts the direction of the runner vane 14. The runner operating device 20 passes through each of the plurality of runner vanes 14 and integrally rotates the plurality of runner vanes 14 about a direction orthogonal to the rotation axis. The runner operation device 20 includes a link mechanism 24, an operation rod 26, a spacer 28, an axial movement device 30, and a cover 38.

  One of the link mechanisms 24 is connected to the runner vane 14, and the other is connected to the operation rod 26. The link mechanism 24 is a mechanism that converts a linear motion into a rotational motion. The runner vane 14 is rotated by converting the linear motion of the operation rod 26 into a rotational motion.

  The operation rod 26 is inserted into the main shaft 12. The operating rod 26 is connected to the link mechanism 24 at the lower end in the vertical direction. The operation rod 26 has an upper end in the vertical direction protruding above the main shaft 12 in the vertical direction.

  The spacer 28 is fixed to the upper end of the main shaft 12 in the vertical direction. The spacer 28 rotates integrally with the main shaft 12. The spacer 28 is hollow inside, and an operation rod 26 protruding from the main shaft 12 is inserted therein.

  The axial movement device 30 moves the operation rod 26 in the axial direction. The axial movement device 30 includes an operation fluid cylinder 32, a shaft coupling 34, an operation fluid supply device 36, and a cover 38.

  The operating fluid cylinder 32 is disposed on the upper side in the vertical direction of the spacer 28 and rotates integrally with the spacer 28. The operation liquid cylinder 32 moves the operation rod 26 in the axial direction by the operation liquid supplied from the operation liquid supply device 36. That is, the operating fluid cylinder 32 moves the operating rod 26 in the linear motion direction. The operating fluid cylinder 32 includes a piston 42, a rod 44 connected to the piston 42, and a cylinder 46 that houses the piston 42. One end of the rod 44 is fixed to the piston 42, and the other end projects from the cylinder 46 toward the spacer 28, and is fixed to the operation rod 26. The cylinder 46 is fixed above the spacer 28 in the vertical direction. The operating fluid cylinder 32 has a first chamber 48 in a region vertically above the piston 42 in the cylinder 46, and a region in the vertically lower side than the piston 42 in the cylinder 46, that is, a region on the spacer 28 side. This is chamber 49.

  The shaft coupling 34 is disposed above the operation fluid cylinder 32 in the vertical direction. The shaft coupling 34 is a rotary joint (rotary union), and connects the path of the operation liquid of the operation liquid cylinder 32 and the path of the operation liquid of the operation liquid supply device 36. The shaft joint 34 is a high-pressure rotary joint, and is preferably a shaft joint used in a construction machine, a machine tool, or a rolling mill, for example, a high-pressure rotary joint used at a high pressure of 20 MPa or more. The shaft coupling 34 is fixed to the cylinder 46 of the operation fluid cylinder 32, and includes a rotating part 50 that rotates together with the cylinder 46, and a stationary part 52 that is rotatably connected to the rotating part 50. The shaft coupling 34 has a bearing disposed between the rotating portion 50 and the stationary portion 52. The shaft coupling 34 has a bearing disposed between the rotating part 50 and the stationary part 52, and the gap is precisely managed to minimize oil leakage under high pressure. Inside the shaft coupling 34, a path through which the operation liquid flows is formed. The path through which the operating liquid flows will be described together with the operating liquid supply device 36.

  The operation liquid supply device 36 supplies operation liquid to the operation liquid cylinder 32. The operating fluid supply device 36 is a hybrid servo that switches the direction of supplying the operating fluid by operating a reversible pump with a motor. The operating liquid supply device 36 includes a first path 60, a second path 62, a pump 64, a motor 66, and an operating liquid storage tank 68.

  The first path 60 is a path that connects the pump 64 and the first chamber 48. The first path 60 includes a pipe 70, a stationary side pipe 72, a rotation side pipe 74, and an in-cylinder pipe 76. The pipe 70 has one end connected to the pump 64 and the other end connected to the stationary part 52 of the shaft coupling 34. The stationary side pipe line 72 is connected to the pipe 70 and has a circumferential pipe line formed around the rotation axis on the inner peripheral surface of the stationary part 52. One end of the rotation side pipe 74 is connected to the circumferential pipe of the stationary side pipe 72, and the other end is connected to the cylinder 46. The rotation-side pipeline 74 is connected to the circumferential pipeline, so that the rotation-side pipeline 74 remains connected to the stationary-side pipeline 72 even when the rotation unit 50 rotates with respect to the stationary unit 52. One end of the in-cylinder conduit 76 is connected to the rotation side conduit 74, and the other end is connected to the first chamber 48. The first path 60 connects the pump 64 and the first chamber 48 by connecting the pipe 70, the stationary side pipe 72, the rotation side pipe 74, and the in-cylinder pipe 76. Yes.

  The second path 62 is a path that connects the pump 64 and the second chamber 49. The second path 62 includes a pipe 80, a stationary side pipe 82, a rotation side pipe 84, and an in-cylinder pipe 86. The pipe 80 has one end connected to the pump 64 and the other end connected to the stationary part 52 of the shaft coupling 34. The stationary side pipe line 82 is connected to the pipe 80 and has a circumferential pipe line formed around the rotation axis on the inner peripheral surface of the stationary part 52. One end of the rotation side pipe 84 is connected to the circumferential pipe of the stationary side pipe 82, and the other end is connected to the cylinder 46. The rotation-side conduit 84 is connected to the circumferential conduit, so that the state where the rotation-side conduit 84 is connected to the stationary-side conduit 82 is maintained even when the rotation unit 50 rotates with respect to the stationary unit 52. One end of the in-cylinder pipe 86 is connected to the rotation side pipe 84, and the other end is connected to the second chamber 49. The second path 62 connects the pump 64 and the second chamber 49 by connecting the pipe 80, the stationary side pipe 82, the rotation side pipe 84, and the in-cylinder pipe 86. Yes.

  The pump 64 is a reversible pump capable of switching between a state in which the operating liquid is supplied to the pipe 70 and a state in which the operating liquid is supplied to the pipe 80. The motor 66 drives the pump 64. The operation liquid storage tank 68 supplies the operation liquid to the pump 64 and collects the operation liquid leaked from the shaft coupling 34.

  The cover 38 is fixed to the cover of the generator 6. The cover 38 covers each part of the runner operating device 20 connected to the upper end of the main shaft 12 in the vertical direction, specifically, the outer periphery of the operating fluid cylinder 32 and the shaft coupling 34.

  In the hydraulic machine 10, when water flows through the water channel 4 and passes through a region where the runner vanes 14 are disposed, the runner vanes 14 receive a rotational force by the force of the passing water. When a rotational force is applied to the runner vane 14, the runner vane 14, the runner boss 16 and the main shaft 12 are rotated. In the hydroelectric power generation device 5, when the hydraulic machine 10 rotates, the rotating unit 8 of the generator 6 rotates to generate power.

  Further, the runner operating device 20 drives the pump 64 with the motor 66 of the operating fluid supply device 36 and supplies the operating fluid to the first chamber 48 via the first path 60, whereby the operating fluid in the first chamber 48 is supplied. Is made higher than the pressure of the operating fluid in the second chamber 49, and the piston 42 is biased toward the second chamber 49. Thereby, the piston 42 is moved to the second chamber 49 side, that is, the spacer 28 side, and the operation rod 26 connected to the piston 42 is moved downward in the vertical direction. As the operating rod 26 moves, the runner vane 14 is rotated via the link mechanism 24. Further, the operating fluid discharged from the second chamber 49 is discharged from the second path 62 to the pump 64. The pump 64 supplies the operation liquid discharged from the second path 62 to the first path 60. As described above, the operating fluid supply device 36 moves the operating fluid through the cylinder 46, the first path 60, the second path 62, and the pump 64 in one closed path.

  Further, the runner operating device 20 drives the pump 64 with the motor 66 of the operating fluid supply device 36 and supplies the operating fluid to the second chamber 49 via the second path 62, whereby the operating fluid in the second chamber 49 is supplied. Is made higher than the pressure of the operating fluid in the first chamber 48, and the piston 32 is biased toward the first chamber 48. As a result, the piston 42 is moved to the first chamber 48 side, that is, the shaft coupling 34 side, and the operation rod 26 connected to the piston 42 is moved upward in the vertical direction. As the operating rod 26 moves, the runner vanes 14 are rotated in the opposite direction to the case where the operating rod 26 moves downward in the vertical direction via the link mechanism 24. Further, the operating fluid discharged from the first chamber 48 is discharged from the first path 60 to the pump 64. The pump 64 supplies the operation liquid discharged from the first path 60 to the second path 62. As described above, the operating fluid supply device 36 moves the operating fluid through the cylinder 46, the first path 60, the second path 62, and the pump 64 in one closed path. The runner operation device 20 controls the operation liquid supplied to the operation liquid cylinder 32 and adjusts the pressure of the operation liquid, thereby rotating the runner vane 14 to adjust the opening degree.

  In the runner operating device 20 of the present embodiment, the operating rod 26 is arranged to the upper side in the vertical direction than the main shaft 12, protrudes in the vertical direction above the generator 6, and the operating liquid circulates in the vertical direction above the operating rod 26. By disposing the cylinder, it is possible to have a structure in which the operating fluid does not flow into the operation rod 26 and the main shaft 12. Thereby, the structure of the runner operating device 20 can be simplified, and the maintenance of the path through which the operating fluid circulates can be simplified. Specifically, even if repair or replacement is necessary due to aging or an accident, the generator can be processed without disassembling, and the outage period and repair costs can be greatly reduced.

  In addition, the runner operating device 20 is a hybrid servo that drives the reversible pump 64 to the operating fluid supply device 36 by a motor 66 and supplies the operating fluid in both directions, so that, for example, pressure oil from a gear pump or a screw pump. In the case of pressure oil accumulated in the tank, or when a constant capacity positive displacement pump such as a swash plate type piston pump or gear pump is directly connected, it is possible to supply the operation liquid with a higher pressure more efficiently. Since the operating fluid can be increased in pressure, the operating fluid cylinder 32 and the shaft coupling 34 can be reduced in size. Specifically, the operating fluid supply device 36 preferably supplies an operating fluid having a pressure of 5 MPa or more to the cylinder, and more preferably supplies an operating fluid having a pressure of 13 MPa or more to the cylinder. Thereby, the operating fluid cylinder 32 and the shaft coupling 34 can be reduced in size. Further, the operating fluid cylinder 32 and the shaft coupling 34 can be arranged at the end of the main shaft 12 on the upper side in the vertical direction without reinforcing the generator 6. Note that the operating fluid supply device 36 can reduce the size of the device by supplying an operating fluid having a pressure of 5 MPa or more, preferably 13 MPa or more to the cylinder, and can be driven efficiently. It is good also as a structure which supplies the hydraulic fluid of the pressure of less than 5 MPa.

  The runner operation device 20 employs an introduction device that supplies a high-pressure operation liquid with a simple shape in place of the operation liquid introduction device having a complicated structure for introducing the operation liquid into the rotating portion. As a result, it is possible to reduce the size of the operating mechanism necessary for adjusting the opening of the movable blade, and it is possible to reduce the manufacturing cost of the hydraulic machine.

  Further, the runner operating device 20 of the present embodiment can be easily separated from the main shaft 12 by assembling the spacer 28 between the cylinder 46 of the operating liquid cylinder 32 and the main shaft 12 and is assembled. Can be easier.

  Here, the runner operation device 20 preferably uses oil as the operation liquid, but is not limited thereto. As the operation liquid, an appropriate liquid can be adopted as long as it can be used in the water turbine device. In this embodiment, the hydraulic machine 10 is a Kaplan turbine. However, the hydraulic machine 10 is not limited to this, and other hydraulic blade type turbines having movable blades such as a mixed flow turbine and a valve turbine are used. it can. Moreover, the hydraulic machine 10 is applicable also to the movable blade | wing type hydraulic machine apparatus containing a movable blade | wing type pump apparatus.

2 Generator floor 4 Water channel 5 Hydroelectric generator 6 Generator 7 Stationary part 8 Rotating part 10 Hydraulic machine 12 Spindle (Rotating axis, Generator axis)
14 runner vane 16 runner boss 20 runner operating device 24 link mechanism 26 operating rod 28 spacer 30 axial movement device 32 operating fluid cylinder 34 shaft coupling 36 operating fluid supply device 38 cover 42 piston 44 rod 46 cylinder 48 first chamber 49 second chamber 50 Rotating section 52 Stationary section 60 First path 62 Second path 64 Pump 66 Motor 68 Operating liquid storage tank 70, 80 Piping 72, 82 Stationary side pipes 74, 84 Rotating side pipes 76, 86 Cylinder inner pipe

Claims (4)

A movable blade position manipulating device for manipulating the position of a movable blade of a hydraulic machine,
A link mechanism connected to the movable wing and rotating the movable wing;
An operation rod inserted into the main shaft of the hydraulic machine, connected to the link mechanism, rotated together with the shaft, and movable in the axial direction;
An axial movement device that moves the operating rod in the axial direction;
The operation rod protrudes at the end on the upper side in the vertical direction from the main shaft,
The axial movement device is disposed at an end of the operating rod opposite to the end where the link mechanism is installed, and rotates with the operating rod, and a piston connected to the operating rod and the piston An operating fluid cylinder comprising the arranged cylinders;
The operating liquid cylinder is connected to the operating liquid cylinder and has a rotating part that rotates and a supporting part that supports the rotating part in a rotatable state, and the operating liquid is supplied between the rotating part and the supporting part. A shaft coupling formed with a conduit for circulation;
An operating fluid supply device capable of supplying an operating fluid to both sides of the piston of the cylinder via the shaft coupling. In the hydraulic machine, a generator whose rotating part rotates together with the main shaft is arranged on the upper side in the vertical direction from the movable blade,
The movable blade operating device according to claim 1, wherein the main shaft protrudes at an end portion on a vertically upper side than the generator.   The operating liquid supply device includes a pipe connected to a fixed portion of the shaft coupling, a pump capable of switching a path for supplying the operating liquid, and a motor for driving the pump, and the pipe and the 3. The movable blade operating device according to claim 1, wherein an operating fluid circuit is formed by the cylinder and the pump.   The movable blade operating device according to any one of claims 1 to 3, wherein the operating fluid supply device supplies an operating fluid having a pressure of 13 MPa or more to the cylinder.

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