hydraulic machinery

A technology of hydraulic machinery and guide vanes, applied in the field of hydraulic machinery, can solve problems such as increased loss, increased flow loss of guide vanes 120, flow turbulence, etc., to achieve the effect of reducing flow loss and suppressing horseshoe-shaped vortices

Active Publication Date: 2019-12-17
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The generation of such a horseshoe-shaped vortex W disturbs the flow of water flowing into the guide vane 120, and thus the loss of the flow on the guide vane 120 may increase.
In addition, since water flows into the flow channel in a turbulent flow, the flow loss on the flow channel may also increase.

Method used

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  • hydraulic machinery
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0031] figure 1 A Francis type pump turbine 1 is shown as an example of the hydraulic machine according to the first embodiment of the present invention. In addition, in the following description, the Francis type pump-turbine 1 is simply called a water turbine 1 . This water turbine 1 includes a casing 10 into which water flows through an iron pipe 11 from an upper tank (not shown), a plurality of guide vanes 12 , a plurality of stator vanes 13 , and a flow channel 14 .

[0032] In the water turbine 1 , water from the casing 10 flows into the flow channel 14 through the stationary vane flow channel constituted by the guide vane 12 and the stator vane 13 during operation of the water turbine. Accordingly, the flow channel 14 rotates around the flow channel rotation axis C1. In addition, in the following description, when only referring to an axial direction, it means the direction on the flow path rotation axis C1 or the direction along the flow path rotation axis C1. In a...

no. 2 approach

[0048] Next, a second embodiment will be described. Figure 4 It is a figure which looked at the stator vane, the guide vane, and the lower cover of the Francis type pump turbine which concerns on 2nd Embodiment along the flow path rotation axis. Components in this embodiment that are the same as those in the above-mentioned first embodiment are given the same reference numerals, and description thereof will be omitted.

[0049] In this embodiment, the configuration of the groove 41 is different from that of the first embodiment. That is, if Figure 4 As shown, the groove 41 in this embodiment is formed on an arc centered on the guide vane rotation axis L1 passing between the adjacent guide vane 12 and the stator vane 13 , for example, formed in a Figure 4 on the arc of the part of the circle indicated by the dashed line in . The slots 41 are provided for every combination of adjacent guide vanes 12 and stator vanes 13 , and a plurality of suction holes 42 are provided in ...

no. 3 approach

[0053] Next, a third embodiment will be described. Figure 5 It is a meridian cross-sectional view of the Francis type pump-turbine according to the third embodiment. Components in this embodiment that are the same as those in the above-described embodiments are denoted by the same reference numerals, and description thereof will be omitted.

[0054] In the above-mentioned first embodiment, the suction hole 42 sent the sucked water to the outside of the water turbine 1 as an example, but in this embodiment, the water sucked in the suction hole 42 is sent to the channel side pressure chamber 20 . Specifically, Figure 5 As shown, the suction mechanism 30 has a pipe portion 43 that communicates the suction hole 42 with the flow path side pressure chamber 20 . In addition, the arrangement|positioning structure of the suction hole 42 is the same as that of 1st Embodiment.

[0055] Through such an embodiment, the generation of the horseshoe-shaped vortex that may be generated ar...

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PUM

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Abstract

The present invention provides a hydraulic machine that suppresses the generation of horseshoe-shaped vortices that may be generated around the guide vanes and reduces the loss. A Francis-type pump turbine (1) as a hydraulic machine is a hydraulic machine that rotates a flow path (14) by water flowing from a fixed blade (13) to a flow path (14) via a guide vane (12). An upper cover (18U) is disposed above the fixed blade (13) and the guide vane (12), and a lower cover (18D) is disposed below. Then, it is provided with a suction mechanism that can suck in at least one of the area between the fixed blade (13) and the guide vane (12) on the upper cover (18U) side and the lower cover (18D) side.

Description

technical field [0001] Embodiments of the present invention relate to a hydraulic machine. Background technique [0002] As hydraulic machines, for example, a Francis type water turbine and a Francis type pump turbine are known. Figure 12 It is a figure which planarly shows the flow path of the stationary vane row which consists of the guide vane 120 and the stator vane 130 of a general Francis type pump turbine. A plurality of guide vanes 120 are arranged at intervals in the circumferential direction so as to surround the flow channel on the outside in the radial direction of the flow channel (not shown), and the stator blades 130 are arranged on the circumferential outside in the radial direction of the blade row of the guide vane 120 . A plurality of them are arranged at intervals upward. In addition, a case (not shown) is arranged on the radially outer side of stator blade 130 . [0003] Figure 12 The hollow arrows in the figure indicate the direction of the water fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B3/02F03B3/12F03B3/18
CPCF03B3/02F03B3/125F03B3/186Y02E10/20
Inventor 成川円川尻秀之黑泽贞男翟雅斌大竹典男富冈拓也稻田浩也
Owner KK TOSHIBA
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