Interstage guide vanes for hydraulic turbine mode hydraulic turbine

Abstract

The present application relates to the technical field of water turbine, and particularly relates to a stage guide vane of water turbine mode hydraulic turbine, which comprises an inlet guide vane, an outlet guide vane, a middle partition plate and a guide cone, the inlet guide vane and the outlet guide vane are arranged on the outer periphery of the middle partition plate and extend to the front side and the rear side of the middle partition plate respectively, the inlet guide vane and the outlet guide vane are provided with a plurality of three-dimensional twisted connections in one-to-one correspondence, forming a plurality of independent flow channels without interference, the front ends of the plurality of inlet guide vanes form a guide vane inlet on the front side of the middle partition plate, the rear ends of the plurality of outlet guide vanes form a guide vane outlet on the rear side of the middle partition plate, the guide cone is arranged at the guide vane outlet, and the guide cone is a cone with a diameter gradually decreasing from front to rear. The water turbine mode hydraulic turbine has the advantages of good connection with upper and lower stage runner, small axial size, small water loss and good performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic turbine, in particular to a guide vane between stages of hydraulic turbine mode liquid turbine. BACKGROUND

[0002] The liquid turbine recycles the residual energy of liquid by converting the kinetic energy of liquid flow into mechanical energy. For the multi-stage hydraulic turbine mode liquid turbine, the runner is designed according to the hydraulic prime mover theory, and the guide vane between stages connecting two runners has a great influence on the performance of the whole device. At present, most of the guide vanes between stages have a large axial size, which increases the axial size of the multi-stage hydraulic turbine mode liquid turbine. SUMMARY

[0003] In view of the above defects of the prior art, the technical problem to be solved by the present application is to provide a guide vane between stages of hydraulic turbine mode liquid turbine with small axial size.

[0004] In order to solve the above technical problems, the present application adopts the following technical scheme:

[0005] The present application provides a guide vane between stages of hydraulic turbine mode liquid turbine, which comprises an inlet guide vane, an outlet guide vane, an intermediate partition plate and a flow guide cone. The inlet guide vane and the outlet guide vane are both arranged on the outer periphery of the intermediate partition plate and extend to the front side and the rear side of the intermediate partition plate respectively. The inlet guide vane and the outlet guide vane are both provided with a plurality of guide vanes and are connected in one-to-one correspondence in a three-dimensional twisted manner to form a plurality of independent flow channels without interference. The front ends of the plurality of inlet guide vanes form a guide vane inlet on the front side of the intermediate partition plate, and the rear ends of the plurality of outlet guide vanes form a guide vane outlet on the rear side of the intermediate partition plate. The flow guide cone is arranged at the guide vane outlet, and the flow guide cone is a cone with a diameter gradually decreasing from front to rear.

[0006] Preferably, the front end of the flow guide cone is connected to the rear side of the intermediate partition plate, and the rear end of the flow guide cone extends out of the guide vane outlet.

[0007] Preferably, the flow guide cone is coaxially arranged with the guide vane outlet.

[0008] Preferably, the inlet guide vane and the outlet guide vane are both welded to the intermediate partition plate.

[0009] Preferably, the inlet guide vane and the outlet guide vane are connected to the upper runner and the lower runner of the hydraulic turbine mode liquid turbine respectively. The diameter of the guide vane inlet is equal to the outlet diameter of the upper runner, and the diameter of the guide vane outlet is equal to the inlet diameter of the lower runner.

[0010] Preferably, the width of the guide vane inlet is equal to the width of the guide vane outlet.

[0011] Preferably, the width of the guide vane inlet and the width of the guide vane outlet are both in the range of 100mm-250mm.

[0012] Preferably, the thickness of the intermediate partition is 1.5 times the width of the guide vane inlet.

[0013] Preferably, the number of the inlet guide vanes and the number of the outlet guide vanes are both 8-12.

[0014] Preferably, the inlet angle of the inlet guide vanes and the outlet angle of the outlet guide vanes are both determined according to the basic equation of the water turbine and the velocity transformation formula.

[0015] Compared with the prior art, the present application has significant progress:

[0016] The inter-stage guide vanes of the water turbine mode hydraulic turbine of the present application are used as follows: the liquid flow from the outlet of the upper-stage runner passes through the guide vane inlet, along the inlet angle of the inlet guide vanes, enters the independent flow channel between the guide vanes (inlet guide vanes / outlet guide vanes), changes the flow direction through the three-dimensionally twisted connection of the inlet guide vanes and the outlet guide vanes, and then passes through the guide vane outlet along the outlet angle of the outlet guide vanes, and enters the lower-stage runner under the guidance of the guide cone. The guide cone can ensure that the liquid flow at the guide vane outlet space flows in the required direction, and reduces the hydraulic loss. The inter-stage guide vanes of the water turbine mode hydraulic turbine of the present application are connected with the upper-stage runner and the lower-stage runner through the inlet guide vanes and the outlet guide vanes respectively, and the inlet guide vanes and the outlet guide vanes are directly connected in three dimensions, so that the axial dimension of the entire inter-stage guide vanes is small, which can effectively reduce the axial dimension of the multi-stage water turbine mode hydraulic turbine, and at the same time, the liquid flow between the two-stage runners is smoothly transmitted, and is guided according to the required liquid flow circulation requirement, and the performance is good. Therefore, the inter-stage guide vanes of the water turbine mode hydraulic turbine of the present application have the advantages of good connection with the upper-stage runner and the lower-stage runner of the water turbine mode hydraulic turbine, small axial dimension, small hydraulic loss, and good performance. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the rear side view of the inter-stage guide vanes of the water turbine mode hydraulic turbine of the embodiment of the present application.

[0018] Figure 2 is Figure 1 the front side view of the inter-stage guide vanes.

[0019] Figure 3 is Figure 1 the front view of the inter-stage guide vanes.

[0020] Figure 4 is Figure 1 the rear view of the inter-stage guide vanes.

[0021] Figure 5 is Figure 1 the top view of the inter-stage guide vanes.

[0022] Figure 6 is Figure 4A cross-sectional view along the direction of arrow A-A.

[0023] Figure 7 is Figure 1 A structural schematic diagram of the inlet guide vane in the inter-stage guide vane shown.

[0024] Figure 8 is Figure 1 A structural schematic diagram of the outlet guide vane in the inter-stage guide vane shown.

[0025] Figure 9 is Figure 1 A schematic diagram of the three-dimensional twisted connection of the inlet guide vane and the outlet guide vane in the inter-stage guide vane shown.

[0026] Figure 10 is Figure 1 A simplified structural size schematic diagram of the inter-stage guide vane shown.

[0027] In the drawings, the reference signs are explained as follows:

[0028] 1 inlet guide vane

[0029] 2 outlet guide vane

[0030] 3 intermediate partition plate

[0031] 4 flow guide cone

[0032] 5 independent flow channel

[0033] 6 guide vane inlet

[0034] 7 guide vane outlet DETAILED DESCRIPTION

[0035] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate the present application, and are not limiting to the present application.

[0036] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms “first” and “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present application, it is necessary to point out that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In addition, in the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0039] As Figures 1 to 10 shown, an embodiment of the inter-stage guide vane of the hydraulic turbine mode hydraulic turbine of the present application. The inter-stage guide vane of the hydraulic turbine mode hydraulic turbine of the present embodiment is used to connect the upper and lower stages of the runner of the hydraulic turbine mode hydraulic turbine, and the liquid flow from the upper stage runner enters the lower stage runner after flowing through the inter-stage guide vane of the present embodiment. For ease of description, in the present application, the overall flow direction of the liquid flow is defined as flowing from the upper stage runner to the inter-stage guide vane, and then to the lower stage runner, that is, from "front" to "back", then the arrangement direction of the inter-stage guide vane and the upper and lower stages of the runner of the present embodiment is that the upper stage runner, the inter-stage guide vane and the lower stage runner are arranged in order from front to back.

[0040] Referring to Figures 1 to 9 , the inter-stage guide vane of the hydraulic turbine mode hydraulic turbine of the present embodiment includes an inlet guide vane 1, an outlet guide vane 2, an intermediate partition plate 3 and a flow guide cone 4. The inlet guide vane 1 and the outlet guide vane 2 are both provided with a plurality of, and the plurality of inlet guide vanes 1 and the plurality of outlet guide vanes 2 are both arranged on the outer periphery of the intermediate partition plate 3. In addition, the inlet guide vane 1 extends to the front side of the intermediate partition plate 3, the outlet guide vane 2 extends to the rear side of the intermediate partition plate 3, and the plurality of inlet guide vanes 1 and the plurality of outlet guide vanes 2 are connected in one-to-one correspondence in a three-dimensional twisted manner to form a plurality of independent flow passages 5 that do not interfere with each other, and each independent flow passage 5 is located between adjacent inlet guide vanes 1 and corresponding adjacent outlet guide vanes 2. Since the inlet guide vane 1 and the outlet guide vane 2 are directly connected in a three-dimensional twisted manner, each independent flow passage 5 is a three-dimensional twisted flow passage, which can change the direction of the liquid flow. The front ends of the plurality of inlet guide vanes 1 form a guide vane inlet 6 on the front side of the intermediate partition plate 3, the guide vane inlet 6 communicates with the inlets of each independent flow passage 5, and the guide vane inlet 6 is connected to the outlet of the upper stage runner. The rear ends of the plurality of outlet guide vanes 2 form a guide vane outlet 7 on the rear side of the intermediate partition plate 3, the guide vane outlet 7 communicates with the outlets of each independent flow passage 5, and the guide vane outlet 7 is connected to the inlet of the lower stage runner. The flow guide cone 4 is arranged at the guide vane outlet 7, and the flow guide cone 4 is a cone with a diameter gradually decreasing from front to back, which plays a role of flow guide.

[0041] The water turbine mode liquid turbine of the embodiment is connected with the upper and lower runner through the inlet guide vane 1 and the outlet guide vane 2, and the inlet guide vane 1 and the outlet guide vane 2 are directly connected in three dimensions, so that the axial size of the whole inter-stage guide vane is small, the axial size of the multi-stage water turbine mode liquid turbine can be effectively reduced, the liquid flow between the two runner is smoothly transmitted, and the liquid flow is guided according to the required liquid flow circulation requirement, and the performance is good. Therefore, the inter-stage guide vane of the water turbine mode liquid turbine has the advantages of good connection with the upper and lower runner of the water turbine mode liquid turbine, small axial size, small hydraulic loss and good performance.

[0042] In the embodiment, preferably, referring to Figure 1 、 Figure 5 and Figure 6 , the front end of the guide cone 4 is connected on the rear side surface of the middle partition plate 3, the rear end of the guide cone 4 extends out of the guide vane outlet 7, and the guide cone 4 is located between the outlet guide vane 2 and the lower runner, so as to ensure that the guide cone 4 effectively guides the liquid flow at the space of the guide vane outlet 7 to the lower runner.

[0043] In the embodiment, preferably, referring to Figure 5 and Figure 6 , the guide cone 4 is coaxially arranged with the guide vane outlet 7.

[0044] In the embodiment, preferably, the inlet guide vane 1 and the outlet guide vane 2 are both welded on the middle partition plate 3.

[0045] Please refer to Figure 10The structural size parameters of the guide vanes of the water turbine mode hydraulic turbine of the embodiment include: diameter D1 of the vane inlet 6, diameter D2 of the vane outlet 7, width b1 of the vane inlet 6, width b2 of the vane outlet 7, thickness b3 of the intermediate partition plate 3, front end diameter D3 of the guide cone 4, height h of the guide cone 4, and number of the guide vanes (vane inlets 1 / vane outlets 2). The width b1 of the vane inlet 6 refers to the extension size of the vane inlet 6 in the front-rear direction, the width b2 of the vane outlet 7 refers to the extension size of the vane outlet 7 in the front-rear direction, the thickness b3 of the intermediate partition plate 3 refers to the extension size of the intermediate partition plate 3 in the front-rear direction, the front end diameter D3 of the guide cone 4 refers to the maximum diameter of the guide cone 4, and the height h of the guide cone 4 refers to the extension size of the guide cone 4 in the front-rear direction.

[0046] In the embodiment, preferably, the diameter D1 of the vane inlet 6 is equal to the outlet diameter of the upper stage runner, and the diameter D2 of the vane outlet 7 is equal to the inlet diameter of the lower stage runner.

[0047] In the embodiment, the width b1 of the vane inlet 6, the width b2 of the vane outlet 7, the thickness b3 of the intermediate partition plate 3, and the number of the guide vanes (vane inlets 1 / vane outlets 2) can be determined according to the specific actual application within a suitable range.

[0048] Preferably, the width b1 of the vane inlet 6 is equal to the width b2 of the vane outlet 7, and the width b1 of the vane inlet 6 and the width b2 of the vane outlet 7 are both preferably within the range of 100mm-250mm. Preferably, the thickness b3 of the intermediate partition plate 3 is 1.5 times the width b1 of the vane inlet 6. Preferably, the number of the vane inlets 1 and the number of the vane outlets 2 are both within the range of 8-12.

[0049] In the embodiment, preferably, the inlet angle of the vane inlet 1 and the outlet angle of the vane outlet 2 are determined according to the water turbine basic equation and the velocity exchange formula, so as to have good matching with the connected upper and lower stage runners.

[0050] In the embodiment, the front end diameter D3 of the guide cone 4 and the height h of the guide cone 4 are determined according to the specific situation of the inlet diameter of the connected lower stage runner within a suitable range.

[0051] The above description is only the preferred embodiment of the present application, and it should be noted that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. An inter-stage guide vane for a hydraulic turbine mode hydraulic turbine, characterized in that, The invention relates to a guide vane device for hydraulic turbine, comprising inlet guide vanes (1), outlet guide vanes (2), an intermediate partition plate (3) and a guide cone (4), wherein the inlet guide vanes (1) and the outlet guide vanes (2) are arranged on the outer periphery of the intermediate partition plate (3) and extend to the front side and the rear side of the intermediate partition plate (3) respectively, the inlet guide vanes (1) and the outlet guide vanes (2) are arranged in pairs and connected in a three-dimensional twisted manner, forming a plurality of independent flow channels (5) which do not interfere with each other, the front ends of the plurality of inlet guide vanes (1) form an inlet guide vane inlet (6) on the front side of the intermediate partition plate (3), the rear ends of the plurality of outlet guide vanes (2) form an outlet guide vane outlet (7) on the rear side of the intermediate partition plate (3), the guide cone (4) is arranged at the outlet guide vane outlet (7), the guide cone (4) is a cone with a diameter gradually decreasing from front to rear, the width of the inlet guide vane inlet (6) is equal to the width of the outlet guide vane outlet (7), the width of the inlet guide vane inlet (6) and the width of the outlet guide vane outlet (7) are both in the range of 100mm-250mm, and the thickness of the intermediate partition plate (3) is 1.5 times the width of the inlet guide vane inlet (6).

2. The inter-stage guide vanes of a hydraulic turbine model hydraulic turbine according to claim 1, characterized in that, The front end of the guide cone (4) is connected to the rear side of the intermediate partition plate (3), and the rear end of the guide cone (4) extends out of the outlet guide vane outlet (7).

3. The inter-stage guide vanes of a hydraulic turbine model hydraulic turbine according to claim 1, characterized in that, The guide cone (4) is coaxially arranged with the outlet guide vane outlet (7).

4. The inter-stage guide vanes of a hydraulic turbine model hydraulic turbine according to claim 1, characterized in that, The inlet guide vanes (1) and the outlet guide vanes (2) are welded to the intermediate partition plate (3).

5. The inter-stage guide vanes of a hydraulic turbine model hydraulic turbine of claim 1, wherein, The inlet guide vanes (1) and the outlet guide vanes (2) are connected to the upper and lower runner of the hydraulic turbine mode liquid turbine respectively, the diameter of the inlet guide vane inlet (6) is equal to the outlet diameter of the upper runner, and the diameter of the outlet guide vane outlet (7) is equal to the inlet diameter of the lower runner.

6. The inter-stage guide vanes of a hydraulic turbine model hydraulic turbine stage of claim 1, wherein, The number of the inlet guide vanes (1) and the number of the outlet guide vanes (2) are both in the range of 8-12.

7. The inter-stage guide vanes of a hydraulic turbine model hydraulic turbine stage of claim 1, wherein, The inlet angle of the inlet guide vanes (1) and the outlet angle of the outlet guide vanes (2) are determined according to the basic equation of hydraulic turbine and the velocity exchange formula.

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