CN210889182U

CN210889182U - Main shaft and runner draw bail suitable for lower formula of tearing open hydraulic turbine down

Info

Publication number: CN210889182U
Application number: CN201921865274.1U
Authority: CN
Inventors: 王艳红; 马永涛; 周成名; 黄清; 童建新
Original assignee: Hangzhou Hangfa Electrical Equipment Co ltd
Current assignee: Hangzhou Hangfa Electrical Equipment Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-06-30
Anticipated expiration: 2029-10-31

Abstract

The utility model relates to a pair of main shaft and runner draw bail suitable for tear formula hydraulic turbine open down, including main shaft and runner, its characterized in that: a plurality of mounting holes which correspond up and down are formed in the lower surface of the main shaft and the upper surface of the rotating wheel, and pin sleeves are mounted in the mounting holes; the main shaft and the rotating wheel are connected through a plurality of double-end studs penetrating through the pin sleeves, the upper ends of the double-end studs are in threaded connection with the main shaft, and the lower ends of the double-end studs are locked with the rotating wheel through nuts. The structure of the utility model makes the disassembly of the runner more convenient, and is convenient for the maintenance and the replacement of the runner; the torque is positioned and transmitted through the pin bush, the mounting precision of the rotating wheel is increased, and the deformation of the stud for connecting the rotating wheel and the main shaft is avoided.

Description

Main shaft and runner draw bail suitable for lower formula of tearing open hydraulic turbine down

Technical Field

The utility model relates to a hydraulic generator's annex especially relates to a main shaft and runner draw bail suitable for tear formula hydraulic turbine open down.

Background

The water turbine is a power machine which converts the energy of water flow into rotary mechanical energy, is widely applied to hydropower stations and is used for driving a generator to generate electricity, and in the hydropower stations, water in an upstream reservoir is guided to the water turbine through a water guide pipe to push a water turbine runner to rotate so as to drive the generator to generate electricity.

A main shaft and a rotating wheel of the water turbine are important parts of the water turbine, in the traditional technology, the main shaft and the rotating wheel are connected in a mode as shown in an attached drawing 1, and are connected through a stud matched with a coupling nut, and during connection, the coupling nut is located on the upper side of the rotating wheel. However, hydropower stations with high silt content in northwest have larger and larger market share, and the rotating wheel is easy to damage under the action of silt during working, so that the rotating wheel needs to be maintained and replaced frequently.

Because the coupling nut is positioned at the upper side of the rotating wheel, when the rotating wheel is disassembled, the main shaft needs to be disassembled from the shafting positioning, and then the rotating wheel is separated from the main shaft, so that the disassembly, the replacement or the maintenance are not convenient enough; when the rotating wheel rotates, a larger torque exists at an interface of the rotating wheel and the main shaft, so that the stud is easily bent and deformed, the stud is deformed to cause the position deviation of the rotating wheel and the main shaft, the positioning accuracy of the rotating wheel is affected, the deformed stud is not easily taken out from screw holes of the main shaft and the rotating wheel, and the main shaft and the rotating wheel are more difficult to separate.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a change or maintain inconveniently to runner among the prior art, runner and the low scheduling problem of main shaft positioning accuracy, provide a main shaft and runner draw bail suitable for lower formula of tearing open hydraulic turbine.

In order to achieve the purpose, the utility model provides a technical scheme does:

the utility model relates to a main shaft and runner draw bail suitable for tear formula hydraulic turbine open down, including main shaft and runner, its characterized in that: the main shaft and the rotating wheel are connected with the stud through a plurality of groups of pin sleeves; one end of the pin bush is inserted into the main shaft, and the other end of the pin bush is inserted into the rotating wheel; the double-end stud penetrates through the pin sleeve, the upper end of the double-end stud is in threaded connection with the main shaft, and the lower end of the double-end stud is locked with the rotating wheel through a nut.

Preferably, the length of the pin bush inserted into the main shaft and the length of the pin bush inserted into the rotating wheel are the same.

Preferably, the pin bush penetrates through the rotating wheel.

Preferably, a drain cone is further arranged below the rotating wheel and connected with the main shaft through a screw. The water discharge cone is used for guiding water flows flowing out through the blade flow channel to quickly and smoothly vent downwards, so that the water flows are prevented from colliding with each other, the hydraulic loss is reduced, and the efficiency of the water turbine is improved.

Preferably, the inner diameter of the pin bushing is the same as the diameter of the stud.

Preferably, a protrusion is arranged at the central part of the bottom end of the main shaft, a hollow part is arranged at the central position of the rotating wheel, the shape and the size of the hollow part are respectively the same as those of the protrusion, and the protrusion is inserted into the hollow part.

Preferably, a gasket is arranged between the nut and the rotating wheel in a cushioning mode, so that the contact area between the nut and the rotating wheel is increased, and indentation on the surface of the rotating wheel is prevented.

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:

1. the utility model discloses a main shaft and runner are connected through a plurality of stud, and stud's upper end and main shaft threaded connection, lower extreme pass through nut and runner locking, change or maintain the runner and need dismantle the runner when, pull down runner lower part nut, and the runner just can very conveniently be demolishd from the tail water side, also need not to demolish main shaft seal and water guide bearing part, and the runner maintenance or change are more convenient.

2. The pin bush is arranged at the interface of the main shaft and the rotating wheel, and plays a role in positioning, so that the mounting precision of the main shaft and the rotating wheel is higher; meanwhile, the rotating wheel is sleeved on the outer side of the stud and used for transmitting torque, and the problem that the rotating wheel is difficult to disassemble due to deformation of the stud is solved.

Drawings

FIG. 1 is a schematic view of a spindle to rotor coupling arrangement of the prior art;

FIG. 2 is a schematic view of a main shaft and runner coupling structure for a drop turbine according to an embodiment;

fig. 3 is a schematic view of a main shaft and runner coupling structure suitable for a drop turbine in the second embodiment.

Description of the labeling: the method comprises the following steps of 1-main shaft, 2-rotating wheel, 3-pin sleeve, 4-double-end stud, 5-nut, 6-water drainage cone, 7-screw and 8-gasket.

Detailed Description

For further understanding of the present invention, the present invention will be described in detail with reference to the following examples, which are provided for illustration of the present invention but are not intended to limit the scope of the present invention.

The first embodiment is as follows:

combine the attached drawing 2 to show, the utility model relates to a main shaft and runner draw bail suitable for lower formula of tearing open hydraulic turbine, including main shaft 1 and runner 2, the central point of 1 bottom of main shaft is equipped with the arch, and the central point of runner 2 puts and is equipped with fretwork portion, and shape, the size of fretwork portion are the same with bellied shape, size respectively, and during the installation, the arch plays the effect of location in inserting the fretwork portion, helps improving the installation accuracy of runner and main shaft.

Referring to fig. 2, the lower surface of the main shaft 1 and the upper surface of the rotating wheel 2 are provided with a plurality of corresponding mounting holes up and down; the main shaft 1 and the rotating wheel 2 are connected through a plurality of groups of pin sleeves 3 and double-end studs 4. The pin bush 3 is arranged in the mounting holes on the lower surface of the main shaft 1 and the upper surface of the rotating wheel 2, so that two ends of the pin bush 3 are respectively inserted into the main shaft 1 and the rotating wheel 2, and the length of the part of the pin bush 3 inserted into the main shaft is the same as that of the part inserted into the rotating wheel. Stud 4 runs through pin bush 3, and upper end and 1 threaded connection of main shaft, and the lower extreme passes through nut 5 and runner locking, still fills up between nut 5 and the runner 2 and is equipped with gasket 8 for increase nut 5 and the area of contact between the runner 2, prevent that the indentation from appearing in the runner 2 surface, the inner circle diameter of pin bush 3 is the same with the diameter of stud 4. The pin bush 3 has two functions: firstly, the positioning function is achieved, and the mounting precision of the main shaft 1 and the rotating wheel 2 is further higher; secondly, the double-end stud is used for transmitting torque, and the phenomenon that the runner 2 is difficult to remove due to deformation of the double-end stud 4 is avoided.

Referring to fig. 2, a drain cone 6 is further arranged below the runner 2, the drain cone 6 is connected with the main shaft 1 through a screw 7, and the drain cone 6 is used for guiding water flows flowing out through the blade flow channel to be quickly and smoothly discharged downwards, so that the water flows are prevented from colliding with each other, the hydraulic loss is reduced, and the efficiency of the water turbine is improved.

Example two:

combine the attached drawing 3 to show, the utility model relates to a main shaft and runner draw bail suitable for lower formula of tearing open hydraulic turbine, including main shaft 1 and runner 2, the central point of 1 bottom of main shaft is equipped with the arch, and the central point of runner 2 puts and is equipped with fretwork portion, and shape, the size of fretwork portion are the same with bellied shape, size respectively, and during the installation, the arch plays the effect of location in inserting the fretwork portion, helps improving the installation accuracy of runner and main shaft.

Referring to fig. 3, the lower surface of the main shaft 1 is provided with a plurality of mounting holes, and the rotating wheel 2 is provided with through holes corresponding to the mounting holes; the main shaft 1 and the rotating wheel 2 are connected through a plurality of groups of pin sleeves 3 and double-end studs 4. The pin bush 3 is arranged in the through hole and penetrates through the rotating wheel 2, and the top end of the pin bush is inserted into the mounting hole of the main shaft 1. Stud 4 runs through pin bush 3, and upper end and 1 threaded connection of main shaft, and the lower extreme passes through nut 5 and runner locking, still fills up between nut 5 and the runner 2 and is equipped with gasket 8 for increase nut 5 and the area of contact between the runner 2, prevent that the indentation from appearing in the runner 2 surface, the inner circle diameter of pin bush 3 is the same with the diameter of stud 4. The pin bush 3 has two functions: firstly, the positioning function is achieved, and the mounting precision of the main shaft 1 and the rotating wheel 2 is further higher; secondly, the double-end stud is used for transmitting torque, and the phenomenon that the runner 2 is difficult to remove due to deformation of the double-end stud 4 is avoided.

When the runner 2 related to the utility model is damaged and needs to be replaced or maintained, firstly, the screw 7 is unscrewed from the drain hole at the center of the drain cone 6 and the drain cone 6 is taken down; then twist and take off nut 5, take out runner 2 from cotter 3 department, to runner 2 maintain or change can, compare with the conventional art, need not to demolish main shaft seal and water guide bearing part, runner 2's maintenance or change are more convenient.

The present invention has been described in detail with reference to the embodiments, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. The utility model provides a main shaft and runner draw bail suitable for tear formula hydraulic turbine down, includes main shaft and runner, its characterized in that: the main shaft and the rotating wheel are connected with the stud through a plurality of groups of pin sleeves; one end of the pin bush is inserted into the main shaft, and the other end of the pin bush is inserted into the rotating wheel; the double-end stud penetrates through the pin sleeve, the upper end of the double-end stud is in threaded connection with the main shaft, and the lower end of the double-end stud is locked with the rotating wheel through a nut.

2. The main shaft and runner coupling structure for a drop turbine as claimed in claim 1, wherein: the length of the pin bush inserted into the main shaft is the same as that of the rotating wheel.

3. The main shaft and runner coupling structure for a drop turbine as claimed in claim 1, wherein: the pin bush penetrates through the rotating wheel.

4. The main shaft and runner coupling structure for a drop turbine as claimed in claim 1, wherein: and a drain cone is further arranged below the rotating wheel and is connected with the main shaft through a screw rod.

5. The main shaft and runner coupling structure for a drop turbine as claimed in claim 1, wherein: the diameter of the inner ring of the pin sleeve is the same as that of the stud.

6. The main shaft and runner coupling structure for a drop turbine as claimed in claim 1, wherein: the central part of the bottom end of the main shaft is provided with a bulge, the central position of the rotating wheel is provided with a hollow part, the shape and the size of the hollow part are respectively the same as those of the bulge, and the bulge is inserted into the hollow part.

7. The main shaft and runner coupling structure for a drop turbine as claimed in claim 1, wherein: and a gasket is arranged between the nut and the rotating wheel in a cushioning mode.