Water pump turbine impeller mounting structure

Abstract

The utility model discloses an impeller mounting structure of a pump turbine. The impeller mounting structure comprises a hub and a plurality of blades mounted on the hub, a pivot flange plate is arranged on the inner circle side of each blade, threads are arranged at the pivot end of each pivot flange plate, the blades are fixedly connected with the hub through pressing plates and fastening nuts, the pressing plates are arranged at the pivot ends in a sleeving mode and located on the inner side of the hub, and a plurality of step bolt holes are formed in the pivot flange plates of the blades. A fastening screw is connected with a threaded hole formed in the pressing plate through the stepped hole so as to form bidirectional threaded fastening; a positioning plate for positioning the direction of rotating around the pivot center of the blade is further arranged between the pressing plate and the flange plate of the pivot flange plate, and the positioning plate is connected and positioned with a corresponding positioning hole in the flange plate through a positioning pin. According to the impeller installation structure of the pump turbine, based on the connection arrangement mode of the positioning plates, the pressing plates, the fastening nuts and the fastening screws, stable connection between the blades and the runner hub can be achieved, meanwhile, the placement angle of the blades can be flexibly adjusted according to the change of the water level, and the use requirement is met.

Description

Technical Field

[0001] The utility model relates to the field of pump - turbine, and particularly to an installation structure of an impeller of a pump - turbine. Background Technique

[0002] In the semi - adjustable blade fastening structure of the runner component of a large - scale pump - turbine, the traditional fastening structures are as follows:

[0003] First, a slotted screw positioning between the blade and the runner body, and a single - fastening structure of the fastening screw;

[0004] Second, a welding structure between the blade and the runner body.

[0005] However, in practice, due to the large size, large mass, large rotational centrifugal force of the blade, and large water torque generated by the conveyed or flowing - through water, the above two methods cannot meet the requirements, or cannot meet the operation or use requirements.

[0006] Adopting the first method of slotted screw positioning between the blade and the runner body and the single - fastening structure of the fastening screw, due to the large centrifugal force, large water torque, and vibration of the unit, it is easy to cause looseness between the blade and the runner body. The change of the blade setting angle causes looseness or fastening failure of the blade and the hub, and the outlet edge of the blade rubs against other parts (guide vane body) to cause operation accidents; while adopting the second method of welding structure between the blade and the runner body, it will lead to the inability to adjust the blade setting angle according to the hydrological changes in the pumping station or power station during operation, so that it cannot meet the use requirements.

[0007] Based on this, there is an urgent need for an installation structure of an impeller of a pump - turbine, which can realize a stable connection between the blade and the runner body, and can also flexibly adjust the blade setting angle according to the water level change to meet the use requirements. Summary of the Utility Model

[0008] Purpose of the Utility Model: The technical problem to be solved by the utility model is to provide an installation structure of an impeller of a pump - turbine, which can realize a stable connection between the blade and the runner body, and can also flexibly adjust the blade setting angle according to the water level change to meet the use requirements.

[0009] Technical Solution: The installation structure of the impeller of the pump - turbine of the utility model includes a hub and a plurality of blades installed on the hub;

[0010] A pivot flange is provided on the inner - circle side of the blade. The pivot end of the pivot flange is provided with a thread. The blade is connected and fixed to the hub through a pressing plate sleeved on the pivot end and located inside the hub and a fastening nut.

[0011] A positioning plate for positioning in the direction of rotation around the center of the blade pivot is further provided between the pressing plate and the flange end of the pivot flange. A plurality of positioning holes corresponding to different installation angle positions are provided on the positioning plate, and a plurality of positioning holes corresponding to different installation angle positions are also provided on the flange end of the flange. The connection positioning between the corresponding positioning holes on the positioning plate and the flange end of the flange is realized through positioning pins.

[0012] Furthermore, an installation hole for installing the pivot flange is provided on the hub of the impeller installation structure, and a connecting boss extends from the installation hole towards the inside of the hub.

[0013] Furthermore, the positioning plate of the impeller installation structure is sleeved on the inner side wall of the boss.

[0014] Furthermore, a plurality of stepped bolt holes are provided at the flange end of the pivot flange of the impeller installation structure, and the fastening screws are connected to the threaded holes provided on the pressing plate through the stepped bolt holes to form a two-way threaded fastening.

[0015] Furthermore, a through hole penetrating the pivot end is provided on the pressing plate of the impeller installation structure.

[0016] Furthermore, a limiting step for connecting with the pivot flange is provided on the boss of the impeller installation structure.

[0017] Furthermore, a limiting step for connecting with the boss is provided on the pressing plate of the impeller installation structure.

[0018] Furthermore, the positioning plate of the impeller installation structure is provided on the installation hole of the hub by welding, or is provided on the installation hole of the hub by integrally forming with the hub.

[0019] Beneficial effects: Compared with the prior art, the advantages of the present utility model are as follows: The impeller installation structure of the pump-turbine is based on a double fastening connection method of connecting the blade pivot, the pressing plate, the fastening nut and connecting the blade pivot flange, the pressing plate, the fastening screw, and combined with a special positioning plate positioning method, which can realize a stable connection between the blade and the runner body, and can also flexibly adjust the blade installation angle according to the water level change to meet the use requirements. Among them, by using the positioning plate to position the rotation direction of the axis line of the blade pivot, the blade can withstand a large hydraulic torque during the operation of the pump-turbine; and a two-way threaded fixing method is adopted, which is firmly fastened and can withstand a large centrifugal force and unit vibration; in addition, when the unit needs to adjust the blade installation angle due to the water level change, the fastening screw and the fastening round nut can be easily disassembled, the blade is rotated to the required angle, that is, the positioning hole on the end face of the pivot flange matching the installation angle is rotated to the same position as the positioning hole on the positioning plate of the hub matching the blade installation angle, the positioning pin is inserted, and then the screw and the round nut are fastened. Description of the Drawings

[0020] Figure 1 Schematic diagram of the impeller installation structure of the present utility model;

[0021] Figure 2 Schematic diagram of the structure of the blade of the present utility model;

[0022] Figure 3 Cross-sectional view (partial cross-sectional view) of the impeller installation structure of the present utility model;

[0023] Figure 4 Schematic diagram of the structure of the positioning plate of the present utility model. Specific embodiments

[0024] The technical solution of the present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] As Figure 1 shown, the impeller installation structure of the pump-turbine of the present utility model includes a hub 1 and a plurality of groups of blades 2 installed on the hub 1.

[0026] Among them, a pivot flange is provided on the inner circular side of the blade 2. The pivot flange includes a flange end 6 connected to the blade 2 and a pivot end 3 at the other end of the flange end 6, as Figure 2 shown. Threads are provided on the pivot end 3.

[0027] As Figure 3 shown, an installation hole for installing the blade 2 is formed on the hub 1, and a connecting boss 10 extending inward from the installation hole to the inner side of the hub 1 is provided. The pivot flange on the blade 2 is assembled in the installation hole, and is stably connected to the hub 1 through a pressing plate 4 nested on the pivot end 3 and a fastening nut 5. At the same time, a plurality of stepped bolt holes 11 are formed on the flange end 6 of the pivot flange, and a plurality of threaded holes 13 are correspondingly formed on the pressing plate 4. The flange 6 and the pressing plate 4 are further stably connected through fastening screws 12 passing through the stepped bolt holes 11 and the threaded holes 13 of the two. And a through hole penetrating the pivot end 3 is formed on the pressing plate 4. Based on this two-way threaded connection, it is possible to prevent the large blade from loosening due to the large centrifugal force generated by its own large mass during rotation and the vibration of the unit. Limiting steps are formed on the end faces of the connecting boss 10 connected to the flange end 6 and the end face connected to the pressing plate 4 to improve the stability of the connection between the blade 2 and the hub 1.

[0028] A hollow blade positioning plate 7 is further provided between the pressing plate 4 and the flange end 6 at the connecting boss 10. The positioning plate 7 can be independently set as a single part and then welded to the hub 1 to form an integral body with the hub 1, or can be directly set as one body with the hub 1. A plurality of positioning holes 8 are provided on the positioning plate 7, as Figure 4As shown. The positioning holes 8 are set according to the positions for forming different blade installation angles, and the specific settings can be adjusted according to actual requirements. The present utility model does not make specific limitations.

[0029] On the flange end 6 of the blade 2, a number of positioning holes 8 are also provided. The blade 2 is positioned by inserting a positioning pin (which can be a cylindrical pin) into the positioning holes 8 on the flange end 6 of the blade 2 and the positioning holes 8 on the positioning plate 7 to realize the positioning of the rotation direction of the blade 2 around the pivot center, ensuring that the impeller does not deflect due to the water torque generated by the conveyed water or the flowing water during the operation of the pump-turbine. When it is necessary to adjust the installation angle of the blade 2, after releasing the above-mentioned threaded connection, the positioning holes 8 on the end face of the flange end 6 of the blade 2 that match the installation angle can be rotated to the same position as the positioning holes 8 on the positioning plate 7 that match the installation angle of the blade 2, and then the positioning pin can be inserted.

[0030] That is, the impeller installation structure of the pump-turbine with the above structure of the present utility model can realize the stable connection between the blade and the runner body, and can flexibly adjust the blade installation angle according to the water level change to meet the usage requirements.

Claims

1. An installation structure of a pump-turbine impeller, characterized in that, It includes a hub (1) and a plurality of blades (2) installed on the hub (1). A pivot flange is provided on the inner circular side of the blade (2), and a thread is provided at the pivot end (3) of the pivot flange. The blade (2) is fixedly connected to the hub (1) through a pressing plate (4) sleeved on the pivot end (3) and located inside the hub (1) and a fastening nut (5). A positioning plate (7) for positioning the rotation direction of the blade (2) around the blade pivot center is further provided between the pressing plate (4) and the flange end (6) of the pivot flange. A plurality of positioning holes (8) corresponding to different placement angle positions are provided on the positioning plate (7), and a plurality of positioning holes (8) corresponding to different placement angle positions are also provided on the flange end (6). The corresponding positioning holes (8) on the positioning plate (7) and the flange end (6) are connected and positioned through positioning pins.

2. The impeller installation structure of the pump-turbine according to claim 1, characterized in that An installation hole for installing the pivot flange is provided on the hub (1), and a connecting boss (10) extends into the interior of the hub (1) from the installation hole.

3. The impeller installation structure of the pump-turbine according to claim 2, characterized in that, The positioning plate (7) is sleeved on the inner side wall of the boss (10).

4. The impeller installation structure of the pump-turbine according to claim 1, characterized in that A plurality of stepped bolt holes (11) are provided on the flange end (6) of the pivot flange, and fastening screws (12) are connected to threaded holes (13) provided on the pressing plate (4) through the stepped bolt holes (11) to form a two-way threaded fastening.

5. The impeller installation structure of the pump-turbine according to claim 1, characterized in that, A through hole penetrating the pivot end (3) is provided on the pressing plate (4).

6. The impeller mounting structure of the pump-turbine according to claim 2, characterized in that, A limiting step for connecting with the pivot flange is provided on the boss (10).

7. The impeller installation structure of the pump-turbine according to claim 2, characterized in that, A limiting step for connecting with the boss (10) is provided on the pressing plate (4).

8. The impeller installation structure of the pump-turbine according to claim 3, characterized in that, The positioning plate (7) is provided on the installation hole of the hub (1) by welding or by an integrally formed manner with the hub (1).

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