JPH073022Y2 - Turbine suppressor - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a suppressor for a water turbine having an improved control mechanism.

[Conventional technology]

Conventionally, when the load on the turbine is suddenly reduced or when the turbine is to be stopped urgently, the guide vane inside the turbine is closed and at the same time the pressure suppressor provided in the casing of the turbine is opened to discharge the water from the hydraulic pipe. Prevents rapid changes in the flow velocity in the penstock and reduces the water hammer effect. FIG. 2 is a structural explanatory view of a conventional hydraulic turbine suppressor. In the figure, when the load of the water turbine sharply decreases, the opening degree of the guide vane (not shown) sharply decreases, and the arm 1 interlocked with the guide vane rapidly moves in the direction of the arrow. The arm 2 rotates in the direction of the arrow with the pin 3 as the fulcrum, and comes to the position shown by the dotted line. At this time, the lever 4 raises the pin 8 of the pressure distribution valve 7 via the fulcrum 6 of the dump pot 5, and enters the state shown by the dotted line.

During normal operation of the water turbine, the pressure oil presses the piston 10 of the servomotor 9 through the pressure distribution valve 7, but when the lever 4 comes to the position indicated by the dotted line, the valve body 11 of the pressure distribution valve 7 rises to release the pressure oil. The inflow is blocked and the pressure oil in the servomotor 9 flows out. Therefore, the piston 10 moves in the direction of the arrow to open the valve 13 of the pressure suppressor 12, and the pressure water in the casing 14 of the water turbine is guided to the water discharge passage through the water discharge pipe 15.

A cam 16 is attached to the valve shaft of the valve 13, and the support shaft 17 of the dump pot 5 is lowered in conjunction with the movement of the cam 16, and the fulcrum 6 is also lowered. Accordingly, the pin 8 is also lowered to close the valve seat 11 of the pressure distributing valve 7, and the pressure oil is guided to the servo motor 9 so that the pressure suppressor 12 is released.
Since a so-called feedback back action that closes the
12 is closed and automatically returns to its original state. In addition, pressure oil is enclosed in the dump port 5, and the spring 18
It also acts as a buffer. In addition, the normal operation of closing the guide vanes is performed gently, and the dump port 5 descends, so the valve seat 11 of the pressure distribution valve 7 does not open, and therefore the pressure suppressor
12 also keeps fully closed.

[Problems to be solved by the device]

When the turbine is to be stopped steadily, the load is gradually reduced to an unloaded state according to the characteristics of the stop control of the turbine, but then the pressure suppressor is used to quickly close the guide vanes to stop the turbine. 12 is activated and pressured water is discharged unnecessarily, resulting in energy loss. In a conventional turbine pressure suppressor, as a countermeasure against this, the operation time of the dump pot 5 and the lap of the pressure distributing valve 7 are adjusted, but this adjustment also has a limit, and the discharge amount of the pressure water is limited. There is a problem such as that the amount is slightly reduced.

[Means for Solving the Problems]

SUMMARY OF THE INVENTION A pressure suppressor for a water turbine according to the present invention is intended to solve the above-mentioned problem, and an arm connected to a lever for operating the pressure suppressor is mounted via a spring so as to be interlocked with a guide vane and the arm of the arm is connected. It is characterized in that the stop device is provided so as to be able to hold the guide vane opening degree at which the turbine performs no-load rated rotation.

[Action]

That is, in the pressure suppressor of the water turbine according to the present invention, the pressure suppressor does not operate when the water turbine is stopped by rapidly closing the guide vane from the unloaded state. A stop device is provided which has two arms for operating the lever and which has a guide vane side arm and a pressure suppressor side arm. The both arms are connected via a spring and the operation of the pressure suppressor side arm is restricted. It is provided. The arm restricting position of this stopping device is the position of the arm in the unloaded rated rotation state of the water turbine.

Even if the guide vanes are rapidly closed to stop the water turbine from the state where the arm is in this restricted position, the rotation of the arm is restricted by the stop device, so the spring only extends and the suppressor does not operate. . However, when the arm rotates rapidly from the beginning, it operates in the same manner as a conventional water turbine suppressor.

〔Example〕

An embodiment of the present invention will be described with reference to FIG. The second
The same parts as those in the figure are designated by the same reference numerals, and the description thereof will be omitted. FIG. 1 is a structural explanatory view of a suppressor for a water turbine according to an embodiment of the present invention. In the figure, when the water turbine is stopped steadily, the arm 1 interlocked with the guide vanes of the water turbine (not shown) gradually moves in the direction of the arrow. The guide vane side arm 19 connected to the arm 1 rotates the arm 2 on the pressure suppressor 12 side in the direction of the arrow via the spring 20. The arm 2 is provided to restrict the operation of the arm 2, and its restricting position comes into contact with the adjustable stop device 22 to stop, but the opening of the guide vane at this time is such that the turbine has no unloaded rated rotation. The regulating position of the stop device 22 is adjusted and set in advance so as to be in this state, and the arm 2 in this state is shown by a chain line.

Even if the guide vanes are rapidly closed to stop the turbine from the state of the arm 2, only the arm 19 on the guide vane side rotates against the spring 20 and reaches the position shown by the dotted line.
During this time, since the rotation of the arm 2 on the pressure suppressor 12 side is restricted by the stop device 22, the pressure suppressor 12 does not operate.
However, when the load of the turbine is suddenly reduced or when the turbine is stopped urgently, the arm 1 moves rapidly in the direction of the arrow from the beginning, so that the lever 4 interlocked with the rotation operation of the arm 2 on the pressure suppressor 12 side is moved. The dumppot 5 cannot follow, and the lever 4 operates the pressure suppressor 12 via the fulcrum 6.
This prevents a rapid change in the flow velocity in the penstock and reduces the water hammer effect.

[Effect of device]

Since the suppressor for a water turbine according to the present invention is configured as described above, it is possible to save energy by eliminating pressured water being discharged unnecessarily even when the water turbine is constantly stopped. In addition, the structure is extremely simple and low cost, and it is possible to carry out on-site remodeling work.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a hydraulic turbine suppressor according to an embodiment of the present invention, and FIG. 2 is a structural explanatory view of a conventional hydraulic turbine suppressor. 2, 19 ... Arm, 4 ... Lever, 12 ... Pressure suppressor, 20 ... Spring, 22
… Stop device.

Claims (1)

[Scope of utility model registration request] 1. An arm connected to a lever for operating a pressure suppressor is mounted via a spring so as to be interlockable with a guide vane, and a stop device for the arm is maintained at a guide vane opening degree at which a water turbine performs a no-load rated rotation. A water turbine suppressor characterized by being installed as much as possible.