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1. 发明专利

JPS62139981A METHOD OF CONTROLLING MOVABLE VANE WATER WHEEL 失效
公开(公告)号：JPS62139981A
公开(公告)日：1987-06-23
申请号：JP27679985
申请日：1985-12-11
申请人： HITACHI LTD
发明人： IKEDA MASAYOSHI
IPC分类号： F03B15/04
摘要： PURPOSE:To return the relationship between both movable runner vanes and guide vanes to the optimum running relationship by measuring the circumferential component of flow speed downstream of the movable runner vane when the relationship between the movable runner vane angle and movable guide vane opening in running is deviated from the optimum running relationship. CONSTITUTION:When the relationship between movable runner vane angle BA and movable guide vane opening GVO is deviated from the optimum running point, the circumferential speed component Vu is increased. Then, by monitoring the circumferential speed component Vu downstream of the movable runner vane can be detected the deviation from the optimum running point, i.e. when the relationship between the movable runner vane angle BA and movable guide vane opening GVO is deviated from the optimum running point by the malfunction of a control machine or the like, said circumferential speed component Vu is increased so that the component is detected by a Pitot tube 3 and a pressure converter 4 to send the detecting signal to the control machine and return said relationship to the optimum running point. Or when it is difficult to return said relationship to the optimum running point, and alarm can be given to stop a main engine. Thus, the safety of control performance can be improved.

2. 发明专利

JPH03267583A GUIDE VANE OF HYDRAULIC TURBINE 失效
公开(公告)号：JPH03267583A
公开(公告)日：1991-11-28
申请号：JP6712890
申请日：1990-03-19
申请人： HITACHI LTD
发明人： TANAKA YUJI , TOSHIMA MASAMI , TANABE SEIICHI , IKEDA MASAYOSHI
IPC分类号： F03B3/18
摘要： PURPOSE:To improve the turbine efficiency in the operation state with a large flow rate by increasing the blade thickness on the outside diameter side at the intermediate position between the upper and lower cover sides, in the blade shape of the guide vane of the hydraulic turbine having a swirl casing. CONSTITUTION:The blade shape of a guide vane on each of the upper and lower cover sides is made equal. As for the blade shape at the intermediate position on the upper and lower cover sides, the blade thickness ts at the intermediate position 2c between the blade front edge 2a and a rotary shaft position 2d is made 1.3 times of the blade thickness tA on the upper cover side at the same position 2c, and the part between the intermediate position 2c, blade front edge part 2a, and the rotary shaft position 2d is smoothly joined in an circular arc. The part from the rotary shaft position 2d to the downstream side blade rear edge 2b is formed to the same shape to that on the upper cover side. Each of the blade shape on the upper cover side, blade shape at the intermediate position between on the upper and lower cover sides, and the blade shape on the lower cover side is constituted of each smoothly curved surface. Accordingly, even if a water stream VB flows in the flow angle which does not conform to the direction of the blade at the intermediate position between on the upper and lower cover sides, exfoliation of water stream from the blade surface on the outside diameter side is prevented.

3. 发明专利

JPS5882077A OPERATION OF WATER TURBINE OR REVERSIBLE PUMP-TURBINE 失效
公开(公告)号：JPS5882077A
公开(公告)日：1983-05-17
申请号：JP17976581
申请日：1981-11-11
申请人： HITACHI LTD
发明人： IKEDA MASAYOSHI , OGIWARA MASASHIGE
IPC分类号： F03B15/04 , F03B11/00
摘要： PURPOSE:To make it possible to prevent the leakage water by a method wherein in case the quantity of leaking water from a main shaft sealing section increases to an excessive degree, compressed air is supplied into a runner chamber so that the level of water in the chamber is lowered. CONSTITUTION:In case where the quantity of the leaking water increases due to the breakage of the water sealing section 1 during the operation of a water turbine or in case where a water level detector 4 detects a rise in the level of water pooled in a pit 3 due to the clogging of drain pipe 2, the water turbine is stopped and the guide vane 5 is closed as a first step. Next, a water level lowering air feed valve 7 directly connected to a compressed air generator 6 is opened to supply the compressed air into the runner chamber so that the level of the water in the chamber is lowered down to the surface A below the runner, to thereby prevent the leakage of the water.

4. 发明专利

JPS5116089A 失效
公开(公告)号：JPS5116089A
公开(公告)日：1976-02-09
申请号：JP8697674
申请日：1974-07-31
申请人： HITACHI LTD , HITACHI CHEMICAL CO LTD
发明人： KUDO TETSUICHI , OOBAYASHI HIDETOSHI , SHIMOJO TETSUO , NAKAMICHI FUJIO , KURAMOCHI YOSHINORI , IKEDA MASAYOSHI
IPC分类号： G01N27/409

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