CN214035941U

CN214035941U - Multistage water turbine with different runner blade numbers

Info

Publication number: CN214035941U
Application number: CN202022993380.7U
Authority: CN
Inventors: 李延频; 贾凯凯; 张自超; 张利红; 李乾龙; 王辉
Original assignee: North China University of Water Resources and Electric Power
Current assignee: North China University of Water Resources and Electric Power
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2021-08-24
Anticipated expiration: 2030-12-14

Abstract

A multi-stage water turbine with different numbers of runner blades is provided, the multi-stage water turbine has at least two stages, a first stage guide vane corresponds to a first stage runner, each interstage guide vane corresponds to a secondary runner of the corresponding stage, the first stage runner and each secondary runner are fixed on a main shaft through a central hole in sequence, a water outlet of a water diversion chamber is communicated with a water inlet of the first stage guide vane, a water outlet of the first stage guide vane is communicated with a water inlet of the first stage runner, a water outlet of the first stage runner is communicated with a water inlet of the interstage guide vane, a water outlet of the interstage guide vane is communicated with a water inlet of the corresponding secondary runner, a water outlet of the secondary runner is communicated with a water inlet of the interstage guide vane of the next stage, and a water outlet of the last stage secondary runner is communicated with a water inlet of a water outlet chamber; the hydraulic turbine has the advantages of simple structure, novel and unique design, capability of reducing energy resource waste and improving the performance of a multi-stage water turbine, thereby improving the efficiency, lightening the pressure pulsation, prolonging the service life, effectively reducing the energy resource waste and having remarkable environmental protection and economic benefits.

Description

Multistage water turbine with different runner blade numbers

Technical Field

The utility model relates to the field of fluid machinery, especially a multistage hydraulic turbine that a runner blade number is different that is used for high water head hydroelectric generation, pumped storage, pump or complementary energy to retrieve usefulness.

Background

At present, in a common multistage fluid machine such as a multistage water turbine, a multistage pump water turbine, a multistage hydraulic turbine and a multistage pump, the structure and the size (including the number of blades) of a rotating wheel (which refers to an impeller for a pump) are the same, and in the multistage water turbine, the performance of each secondary rotating wheel is reduced except that the performance of a primary rotating wheel is better, so that the overall performance is lower, the vibration is larger, the pressure pulsation is obvious, the energy resource waste is caused, and the purpose of fully utilizing the energy resource cannot be achieved. In order to solve the above problems, redesigning and improving each level of runner to improve the performance of multi-level water turbines such as multi-level water turbines, multi-level pump water turbines, multi-level hydraulic turbines and multi-level pumps, so that the flow state of water flow in the flow channel of the multi-level water turbine is in a good state, which is a technical problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

To the above situation, in order to overcome the defects of the prior art, the present invention aims to provide a multistage water turbine with different numbers of runner blades, which can effectively solve the performance reduction of each secondary runner, thereby leading to the problem of the overall performance reduction.

In order to achieve the above object, the present invention provides a multi-stage water turbine with different numbers of runner blades, comprising a diversion chamber, a first stage guide vane, a first stage runner, each secondary stage guide vane, a corresponding stage runner, a water outlet chamber and a main shaft, wherein the multi-stage water turbine has at least two stages, the first stage guide vane corresponds to the first stage runner, each stage guide vane corresponds to the corresponding stage secondary runner, the first stage runner and each secondary runner are sequentially fixed on the main shaft through a central hole, the upper part of the main shaft extends out of the upper part of the diversion chamber, the water outlet of the diversion chamber is communicated with the water inlet of the first stage guide vane, the water outlet of the first stage guide vane is communicated with the water inlet of the first stage runner, the water outlet of the first stage runner is communicated with the water inlet of the corresponding secondary runner, the water outlet of the secondary runner is communicated with the water inlet of the next stage guide vane, the water outlet of the last-stage secondary runner is communicated with the water inlet of the water outlet chamber.

The utility model discloses simple structure, the modern design is unique, can reduce the energy resource waste, improves the performance of the multi-stage water turbine to improve its efficiency, alleviate its pressure pulsation, prolong its life, effectively reduce the energy resource waste, have apparent environmental protection and economic benefits.

Drawings

Fig. 1 is a schematic structural diagram of each component of the present invention.

Fig. 2 is an assembly schematic diagram of each component of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

The multistage water turbine with different runner blade numbers comprises a diversion chamber 1, a first-stage guide blade 2, a first-stage runner 3, each secondary-stage guide blade 4, corresponding-stage runners 5, a water outlet chamber 6 and a main shaft 7, wherein the multistage water turbine has at least two stages, the first-stage guide blade 2 corresponds to the first-stage runner 3, each inter-stage guide blade 4 corresponds to the corresponding-stage secondary runner 5, the first-stage runner 3 and each secondary runner 5 are fixed on the main shaft 7 sequentially through a central hole, the upper part of the main shaft 7 extends out of the upper part of the diversion chamber 1, the lower end of the main shaft 7 can extend out of the lower part of the water outlet chamber 6 as required, a water outlet of the diversion chamber 1 is communicated with a water inlet of the first-stage guide blade 2, a water outlet of the first-stage runner 2 is communicated with a water inlet of the first-stage runner 3, a water outlet of the first-stage runner 3 is communicated with a water inlet of the inter-stage guide blade 4, a water outlet of the inter-stage guide blade 4 is communicated with a water inlet of the corresponding secondary runner 5, the water outlet of the secondary runner 5 is communicated with the water inlet of the interstage guide vane of the next stage, and so on, and the water outlet of the last stage of secondary runner is communicated with the water inlet of the water outlet chamber 6.

In order to ensure better implementation effect, the primary runner 3 and each secondary runner 5 have the same structure and size except that the number of blades is different.

The primary rotating wheel 3 and each secondary rotating wheel 5 are rotating wheels of the same type, and the rotating wheel type is one of mixed flow type, axial flow type, diagonal flow type or through flow type.

The multi-stage water turbine is one of a multi-stage power generation water turbine, a multi-stage water pump water turbine, a multi-stage hydraulic turbine or a multi-stage pump.

The diversion chamber 1 is one of a volute type water inlet chamber of a conventional water turbine, a volute type water inlet chamber of a multi-stage pump or an annular pressurized water chamber type water inlet chamber of the multi-stage pump.

The first-stage guide vane 2 is in one of a radial type and an axial type.

The interstage guide vane 4 is one of a radial positive and negative guide vane with the same diameter, a radial positive and negative guide vane with different diameters, a flow channel type guide vane, a space guide vane or a novel space guide vane.

The water outlet chamber 6 is one of an annular water outlet chamber, a straight conical water outlet chamber or an elbow-shaped water outlet chamber.

When the utility model is in operation, water flows in from the inlet of the diversion chamber 1, flows through the diversion chamber 1, flows out from the outlet of the diversion chamber 1, flows in from the inlet of the first guide vane 2, flows through the first guide vane 2, flows out from the outlet of the first guide vane 2, flows in from the inlet of the first runner 3, flows through the first runner 3, flows out from the outlet of the first runner 3, flows in from the inlet of the interstage guide vane 4, flows through the interstage guide vane 4, flows out from the outlet of the interstage guide vane 4, flows in from the inlet of the runner 5 of the corresponding stage, flows through the runner 5 of the corresponding stage, flows out from the outlet of the runner 5 of the corresponding stage, flows in from the inlet of the interstage guide vane of the next stage, flows in from the outlet of the interstage guide vane of the same stage, flows in from the inlet of the runner of the corresponding stage, flows through the runner of the corresponding stage, flows out from the outlet of the runner of the corresponding stage, by analogy, the final water flows out from the outlet of the last-stage secondary runner (only one interstage guide vane 4 and the corresponding secondary runner 5 are shown in the figure), flows into the water outlet chamber 6 and flows out from the outlet of the water outlet chamber 6, and the rotation of the runner drives the main shaft 7 to rotate, so that the multi-stage water turbine is driven to work, and the hydroelectric generator is driven to generate electricity or drive other machinery.

The utility model discloses simple structure, design scientific and reasonable, through the experiment, respond well, concrete calculation data as follows:

a two-stage water turbine mode hydraulic turbine has the following design parameters: the flow rate is 0.89m3/s, the water head is 187m, the rotating speed is 1500r/min, the two stages of rotating wheels are all mixed flow type rotating wheels, and the number of blades is 14. The turbine main parameters are shown in table 1;

TABLE 1 turbine principal parameters

The overall efficiency of the two-stage hydraulic turbine under the designed working condition is calculated to be 80.24%.

The utility model discloses modify former second grade hydraulic turbine mode hydraulic turbine, the turbine design parameter is: flow rate of 0.89m³The rotating wheels at all stages are of mixed flow type, wherein the number of blades of the first stage rotating wheel is 12, and the number of blades of the second stage rotating wheel is 16. The number of blades of the primary rotating wheel is different from that of the secondary rotating wheel, and the main parameters of the turbine are shown in a table 2;

TABLE 2 turbine principal parameters

Through experiments, after the number of the blades of the rotating wheel is changed, under the design working condition, the overall efficiency of the two-stage hydraulic turbine is improved81.169% and 0.929% higher. And after the number of the blades is changed, the optimal working condition of the secondary hydraulic turbine is larger than the working condition of large flow (the flow is 1.068 m)³/s), the optimal efficiency is 81.9%. Prove the utility model discloses can promote hydraulic turbine's efficiency effectively.

The utility model discloses simple structure, the modern design is unique, can promote the wholeness ability of the multi-stage water turbine, reduces its pressure pulsation, promotes its working property, prolongs its life, promotes its whole efficiency, effectively improves energy resource's utilization efficiency, is the innovation on the multi-stage water turbine, has apparent environmental protection and economic benefits.

Claims

1. A multi-stage water turbine with different runner blade numbers comprises a diversion chamber (1), a first-stage guide vane (2), a first-stage runner (3), each secondary stage interstage guide vane (4), a corresponding stage runner (5), a water outlet chamber (6) and a main shaft (7), and is characterized in that the multi-stage water turbine has at least two stages, the first-stage guide vane (2) corresponds to the first-stage runner (3), each interstage guide vane (4) corresponds to the corresponding primary stage secondary runner (5), the first-stage runner (3) and each secondary runner (5) are fixed on the main shaft (7) through central holes in sequence, the upper part of the main shaft (7) extends out of the upper part of the diversion chamber (1), the water outlet of the diversion chamber (1) is communicated with the water inlet of the first-stage guide vane (2), the water outlet of the first-stage guide vane (2) is communicated with the water inlet of the first-stage runner (3), the water outlet of the first-stage runner (3) is communicated with the water inlet of the interstage guide vane (4), the water outlet of the interstage guide vane (4) is communicated with the water inlet of the corresponding secondary runner (5), the water outlet of the secondary runner (5) is communicated with the water inlet of the interstage guide vane of the next stage, and the water outlet of the secondary runner of the last stage is communicated with the water inlet of the water outlet chamber (6).

2. A multistage water turbine with different numbers of runner blades according to claim 1, characterized in that the structure and size of the runner are the same except that the number of the blades of the primary runner (3) is different from that of the secondary runners (5).

3. A multi-stage hydraulic turbine with different numbers of runner blades according to claim 2, characterized in that the primary runner (3) and each secondary runner (5) are of the same type, and the type of runner is one of mixed flow type, axial flow type, diagonal flow type or through flow type.

4. The multi-stage hydraulic turbine with different runner blade numbers according to claim 1, wherein the multi-stage hydraulic turbine is one of a multi-stage power generation hydraulic turbine, a multi-stage pump hydraulic turbine, a multi-stage hydraulic turbine or a multi-stage pump.

5. The multi-stage hydraulic turbine with different runner blade numbers according to claim 1, wherein the diversion chamber (1) is one of a volute type water inlet chamber of a conventional hydraulic turbine, a volute type water inlet chamber of a multi-stage pump or an annular pumping chamber type water inlet chamber of the multi-stage pump.

6. A multi-stage hydraulic turbine with different runner blade counts according to claim 1, characterized in that the first stage guide vanes (2) are one of radial type or axial type.

7. The multistage water turbine with different runner blade numbers according to claim 1, wherein the interstage guide vane (4) is one of a same-diameter radial type positive and negative guide vane, a different-diameter radial type positive and negative guide vane, a flow channel type guide vane, a space guide vane or a novel space guide vane.

8. A multi-stage hydraulic turbine with different numbers of runner blades as claimed in claim 1, wherein the outlet chamber (6) is one of an annular outlet chamber, a straight conical outlet chamber or an elbow outlet chamber.