CN214366514U

CN214366514U - Drainage cone handle structure of water turbine

Info

Publication number: CN214366514U
Application number: CN202122129903.8U
Authority: CN
Inventors: 王平; 孙天嵘
Original assignee: Shenyang Getai Hydropower Equipment Co ltd
Current assignee: Shenyang Getai Hydropower Equipment Co ltd
Priority date: 2021-09-06
Filing date: 2021-09-06
Publication date: 2021-10-08
Anticipated expiration: 2031-09-06

Abstract

The utility model belongs to the technical field of the hydraulic turbine, especially, relate to a hydraulic turbine wash-out awl is closed structure. Including the sluicing awl body, the sluicing awl body adopts detachable split type structure, including upper and lower two parts: the upper end of the drainage cone and the lower end of the drainage cone; the upper end of the water escape cone and the upper crown of the runner are cast into an integral structure, and the lower end of the water escape cone is connected with the upper end of the water escape cone through a bolt handle; the lower end of the water drainage cone comprises a connecting end at the top and a cone at the lower part, the top of the connecting end is provided with a bolt hole, and the lower part of the connecting end is provided with a bolt accommodating space; a bolt is arranged in the bolt accommodating space and penetrates through the bolt hole; the accommodating space is provided with a guard plate; and a flow guide rib plate is arranged in the inner cavity at the lower end of the drainage cone. The problem of cracks at the water outlet edge of the upper crown of the blade is solved, and the safe operation performance of the unit is improved.

Description

Drainage cone handle structure of water turbine

Technical Field

The utility model belongs to the technical field of the hydraulic turbine, especially, relate to a hydraulic turbine wash-out awl is closed structure.

Background

The francis turbine is one of the most widely used turbines in modern times and occupies an important position in the field of hydropower. The runner is an important part in the mixed-flow water turbine, and the drainage cone at the upper crown of the mixed-flow runner is an important component of the runner. The medium and large HLGS1502 mixed flow runner crown structure is long and narrow, and as shown in FIG. 1, the runner crown and the water discharge cone are integrated and cast integrally. The diameter of the outlet of the drainage cone part is small, and the rotating wheel is difficult to be screwed when being connected with the main shaft. If the coupling bolt cannot be installed at an accurate position, the safe operation of the unit is seriously influenced, and meanwhile, the runner is easily scrapped due to casting defects during casting because the drain cone is long and narrow. When the structure runner operates, the pressure in the tail water pipe is easily distributed unevenly, and irregular pressure pulsation is formed on the wall or the bottom plate of the tail water pipe. The water outlet edge of the blade upper crown is easy to crack, and the safe operation of the unit is seriously influenced. And the inner cavity of the existing drain cone is easy to damage due to the mutual impact of continuous water flows in the use process.

Disclosure of Invention

The utility model discloses be exactly to the defect that prior art exists, provide a hydraulic turbine wash-out awl closed structure.

In order to achieve the above object, the utility model discloses a following technical scheme, including the wash-out awl body, its characterized in that: the wash-out cone body adopts detachable split type structure, including upper and lower two parts: the upper end of the drainage cone and the lower end of the drainage cone; the upper end of the water escape cone and the upper crown of the runner are cast into an integral structure, and the lower end of the water escape cone and the upper end of the water escape cone are connected through a bolt handle.

Furthermore, the lower end of the water drainage cone comprises a connecting end at the top and a cone at the lower part, a bolt hole is formed in the top of the connecting end, and a bolt accommodating space is formed in the lower part of the connecting end; and a bolt is arranged in the bolt accommodating space and penetrates through the bolt hole.

Further, the sluicing awl lower extreme includes the link and the cone of lower part at top, the link top is provided with the bolt hole, and the accommodation space that is used for holding the bolt is seted up to the link lower part.

Further, the accommodating space is provided with a guard plate.

Furthermore, a stop washer is arranged between the bolt and the bolt hole.

Compared with the prior art the utility model discloses beneficial effect.

1. The utility model discloses sluicing awl simple structure has solved the installation problem with well, large-scale HLGS1502 type long and narrow mixed flow runner of crown and main shaft coupling bolt, has solved blade crown and has gone out water limit position crack problem simultaneously, has increased the safe operation nature of unit, has still reduced the work degree of difficulty for the power station maintainer. 2. The utility model discloses the setting of wash-out awl lower extreme inner chamber water conservancy diversion gusset reduces rivers striking each other, has also increased the intensity of wash-out awl simultaneously. 3. The utility model discloses to the design of backplate in the composite construction, play the impact that protection connecting bolt does not receive rivers, increase the life of bolt and the operating stability of unit. The damage of the machine set rotating wheel and the machine set tail water caused by the falling of the bolt under special conditions is prevented. Meanwhile, the stability of the flow state of the overflowing surface of the drain cone is improved, drainage is smooth, and the pressure pulsation of a tail water pipe of the unit is reduced.

Drawings

The present invention will be further described with reference to the accompanying drawings and the following detailed description. The scope of protection of the present invention is not limited to the following description.

FIG. 1 is a schematic view of a prior art wash-out cone structure.

FIG. 2 is a schematic view of a structure of a drainage cone in an embodiment.

FIG. 3 is a schematic view of the upper end structure of the drainage cone in the embodiment.

FIG. 4 is a schematic view of the structure of the lower end of the drainage cone in the embodiment.

FIG. 5 is a schematic view of a concrete embodiment of a drainage cone bolt fastening structure.

FIG. 6 is a schematic illustration of an embodiment shield.

Fig. 7 is a schematic cross-sectional view a-a of fig. 4.

In the figure, 1 is the former runner wash-out cone, 2 is the crown, 3 is the roof, 4 is the blade, 5 is the lower ring, 6 is the connecting bolt, 7 is the backplate, 8 is the guide plate, 9 is the water conservancy diversion gusset plate, 10 is the stopper gasket, 11 is the lower bolster.

Detailed Description

As shown in fig. 2-7, the specific embodiment includes a drainage cone body, and the drainage cone body adopts a detachable split structure, and includes an upper part and a lower part: the upper end of the drainage cone and the lower end of the drainage cone; the upper end of the water escape cone and the runner upper crown 2 are cast into an integral structure, and the lower end of the water escape cone and the upper end of the water escape cone are connected through a connecting bolt 6. The upper end of the drain cone and the lower end of the drain cone are in bolt combination, and anti-loosening treatment is carried out through a stop washer 10. The stopper gasket 10 is used to prevent the release of the drain cone due to the loosening and release of the bolt. When having avoided the sluicing awl to drop, can be under the effect of eccentric vortex area and rivers, rotatory towards the draft tube bottom plate, and lead to draft tube bottom plate crackle, runner export rivers can't become axial rivers smoothly, cause the aggravation of pulse water hammer.

The drain cone lower extreme includes the link at top and the cone of lower part, the link top is provided with the bolt hole, and the accommodation space that is used for holding the bolt is seted up to the link lower part. And the outside of the accommodating space is sealed and welded by adopting a protective plate 7. And a flow guide rib plate 9 is arranged in the inner cavity at the lower end of the drainage cone.

The original upper crown drain cone is long and narrow, the welding quality of the runner blade 4 is difficult to ensure in the welding process, and the part of the runner blade cannot be back gouged and welded completely. The defects of cracks and the like appear after the unit operates, and the long and narrow water drainage cone easily causes the unit to vibrate during operation, thereby bringing hidden troubles to the safe operation of the unit. The utility model discloses the upper crown 2 separately casts with the sluicing awl to carry out the finish machining, the upper crown 2 carries out the mode of accurate positioning through the tang with the sluicing awl, guarantees with the fairing degree of the 2 runners of upper crown. And simultaneously, the upper end and the lower end of the drainage cone are firmly closed through bolts. When the runner and the main shaft are installed on the site of a power station, the drain cone (the lower end of the drain cone) is detached, the runner and the main shaft are firstly connected through bolts, the drain cone is installed in place through the bolts after the bolt connection meets the installation requirement, the stop gasket 10 is partially spot-welded on the bolts, and the shield sealing and welding treatment is carried out.

The accommodation space of top link comprises last roof 3, lower fagging 11 and guide plate 8 between the two, and guide plate 8 is used for supporting roof 3 and roof down, and the welding links to each other between the three. The guide plate 8 plays a role in increasing the strength of the drainage cone while playing a role in guiding flow. The inner cavity at the lower end of the water escape cone is provided with the flow guide rib plate 9, the flow guide rib plate 9 reduces mutual impact of water flows, simultaneously, the strength of the water escape cone is increased, hydraulic pulsation, cavitation phenomenon and water hammer pressure in a tail water flow channel are reduced, hydraulic loss of a unit is reduced, and efficiency of the water turbine is improved. The guard plate 7 adopts a split assembly welding structure, the split structure is convenient for the on-site installation of the unit, and the installation difficulty is reduced. The guard plate 7 protects the connecting bolt from being impacted by water flow, and the service life of the bolt is prolonged, and the running stability of the unit is improved. The damage of the machine set rotating wheel and the machine set tail water caused by the falling of the bolt under special conditions is prevented. Meanwhile, the stability of the flow state of the overflowing surface of the drain cone is improved, drainage is smooth, and the pressure pulsation of a tail water pipe of the unit is reduced.

It should be understood that the above detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can still be modified or equivalently replaced to achieve the same technical effects; as long as the use requirement is satisfied, the utility model is within the protection scope.

Claims

1. The utility model provides a hydraulic turbine wash-out awl is closed structure, includes the wash-out awl body, its characterized in that: the wash-out cone body adopts detachable split type structure, including upper and lower two parts: the upper end of the drainage cone and the lower end of the drainage cone; the upper end of the water escape cone and the upper crown of the runner are cast into an integral structure, and the lower end of the water escape cone is connected with the upper end of the water escape cone through a bolt handle;

the lower end of the water drainage cone comprises a connecting end at the top and a cone at the lower part, the top of the connecting end is provided with a bolt hole, and the lower part of the connecting end is provided with a bolt accommodating space; a bolt is arranged in the bolt accommodating space and penetrates through the bolt hole;

the accommodating space is provided with a guard plate;

and a flow guide rib plate is arranged in the inner cavity at the lower end of the drainage cone.

2. The handle structure of the drain cone of the water turbine as claimed in claim 1, wherein: and a stop gasket is arranged between the bolt and the bolt hole.