CN219101497U - Main shaft sealing structure for power station water turbine - Google Patents

Abstract

The utility model relates to a main shaft sealing structure for a power station water turbine, which comprises a water turbine runner, wherein the top of the water turbine runner is fixedly connected with a runner law disc, the top of the runner law disc is movably connected with a main shaft law disc, the top of the main shaft law disc is fixedly connected with a fixed main shaft, the top of the fixed main shaft is fixedly connected with a connecting law disc, the top of the water turbine runner is movably connected with a runner top cover, the top of the runner top cover is movably connected with a sealing base, the top of the sealing base is movably connected with an outer cover plate, the outer side of the fixed main shaft is movably connected with a sealing swivel, the bottom of the sealing swivel is movably connected with a sealing block, and the outer side of the sealing block is movably connected with a sealing ring. The main shaft sealing structure for the power station water turbine is convenient to use, achieves the purpose of good main shaft sealing effect of the power station water turbine, and avoids main shaft sealing failure caused by overlarge output power of the water turbine as much as possible so as to ensure safe operation of a water turbine unit.

Description

Main shaft sealing structure for power station water turbine

Technical Field

The utility model relates to the technical field of power station water turbines, in particular to a main shaft sealing structure for a power station water turbine.

Background

The power station water turbine is a power machine for converting energy of water flow into rotary mechanical energy, and belongs to turbine machinery in fluid machinery.

In the process of using and driving a power station hydraulic turbine, a main shaft is usually required to be sealed and protected so as to ensure the operation effect of the power station hydraulic turbine, for example, a hydraulic turbine main shaft supporting structure proposed in China patent CN215848058U is provided with a clamping groove for inserting two clamping plates into a main shaft bottom plate through a screw on a mounting plate, a starting motor drives a screw to rotate, the screw is rotationally inserted into a screw plate, clamping of the two clamping plates is realized, the main shaft can be supported, the main shaft is prevented from being suspended, and when the clamping plates are clamped, the screw moves in the connecting port.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a main shaft sealing structure for a power station water turbine, which has the advantages of good sealing effect and the like, and solves the problems that the main shaft of the existing power station water turbine has poor sealing effect, the output power of the water turbine is too high, the main shaft sealing is easy to lose efficacy, the safe operation of a water turbine unit is directly threatened, the water guide bearing oil basin is damaged, the unit is not planned to stop running, equipment damage is possibly caused, the equipment damage is repaired, the workload is large, the construction period is long, the power generation capacity of the power station is directly influenced, and accidents of a flooded factory are possibly caused.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a main shaft seal structure for power station hydraulic turbine, includes the hydraulic turbine runner, the top fixedly connected with runner law dish of hydraulic turbine runner, the top swing joint of runner law dish has the main shaft law dish, the top fixedly connected with fixed spindle of main shaft law dish, the top fixedly connected with connection law dish of fixed spindle, the top swing joint of hydraulic turbine runner has the runner top cap, the top swing joint of runner top cap has seal base, seal base's top swing joint has the enclosing cover, the outside swing joint of fixed spindle has seal swivel, seal swivel's bottom swing joint has the sealing block, the outside swing joint of sealing block has the sealing washer.

Further, the inside swing joint of sealing piece has the locating pin, locating pin and sealing base swing joint, the constant head tank has all been seted up to the inboard of sealing piece and sealing base, the locating pin is located the inboard of constant head tank.

Further, the top swing joint of main shaft law dish has the protection casing, the outside swing joint of fixed main shaft has the protection sleeve, the inboard swing joint of protection casing has the connecting pin, connecting pin and movable screw swing joint.

Further, an air shroud is movably connected between one side of the sealing base, which is opposite to the rotating wheel top cover, and the main shaft method disc and the rotating wheel method disc are movably connected with the air shroud.

Further, the inside threaded connection of seal base has connecting screw, connecting screw's bottom runs through seal base and runner top cap in proper order and extends to the inboard of runner top cap.

Further, the inside threaded connection of main shaft law dish has movable screw, runner law dish and movable screw threaded connection, the outside swing joint of movable screw has the spring washer, the bottom of movable screw runs through spring washer, main shaft law dish and runner law dish in proper order and extends to the inboard of runner law dish.

Further, the top fixedly connected with movable bolt of runner top cap, movable nut is connected with to movable bolt's outside threaded connection, movable bolt's top runs through sealed base and movable nut in proper order and extends to the top of movable nut.

Further, the sealing grooves are formed in the inner sides of the sealing base and the outer cover plate, the sealing rings are located in the inner sides of the sealing grooves, and the sealing base and the outer cover plate are movably connected with the sealing rings.

Further, fixed circular slot has been seted up at the top of main shaft method dish, the top fixedly connected with screw head of activity screw, and screw head and spring washer all are located the inboard in fixed circular slot, the protection casing is located the top of screw head.

Further, the sealing base is movably connected with the spindle disc, the sealing block is located between the sealing base and the outer cover plate, and the sealing base and the outer cover plate are movably connected with the sealing block.

Compared with the prior art, the technical scheme of the application has the following beneficial effects:

1. the main shaft sealing structure for the power station water turbine is characterized in that the main shaft sealing structure comprises a rotating wheel disc, a main shaft disc, a fixed main shaft, a connecting disc, a rotating wheel top cover, a sealing base, an outer cover plate, a sealing rotating ring, a sealing block, a sealing ring, a protective cover, a protective sleeve and an air shroud, wherein the connecting part of the rotating wheel and the fixed main shaft can be effectively sealed, so that the operation safety of the rotating wheel and the fixed main shaft is ensured, the sealing base is fixed on the rotating wheel top cover by adopting a connecting screw, a movable bolt and a movable nut, the sealing rotating ring is fixed on the fixed main shaft and rotates together with the fixed main shaft, a sealing block is jacked by utilizing uniform water pressure and is contacted with the sealing rotating ring fixed on the fixed main shaft to form annular sealing water, a small amount of water leakage after sealing automatically flows to a water collecting well from the rotating wheel top cover through a seat ring to a fixed guide vane drain hole and a volute nose drain hole, the whole structure is simple, the use is convenient, the aim of ensuring that the main shaft sealing effect of the power station water turbine is good, the main shaft sealing failure of the water turbine is avoided because the output power is excessively large, the main shaft sealing failure is ensured, the water turbine set is prevented from running safely, the water guide bearing oil basin from entering into the fixed main shaft to damage, the water guide bearing is prevented from generating power set from stopping, and the power generating set is prevented from stopping.

2. This a main shaft seal structure for power station hydraulic turbine sets up sealing ring groove on seal base and the seal swivel in the lower part, can avoid sealing washer and sealing block direct contact, reduce the frictional force in the ascending jack-up of working sealing block, adopt the structure that constant head tank and locating pin combine with the stainless steel seal base, guarantee the concentricity of the inside and outside circle of working sealing block, reduce the deformation of stainless steel seal base, the locating pin adopts the non-through hole at the sealing block, reduce locating pin department and leak, increase fixed main shaft working seal water pressure, divide half face of sealing base to divide half face and sealing block to stagger ninety degrees and assemble, with increase its structural strength and concentricity, prevent later hard deformation, through the deformation to sealing block material, structural style, after the mounting means is reformed transform, deformation in the mounting process is installed through sealing base's locating pin and sealing block ninety degrees, can effectively resume the processing back state with the deformation, it has increased the floating pressure to reform transform sealing block constant head tank, lubrication water hole and sealing washer position.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is an enlarged view of a portion a of fig. 1, which is a structural view of the present utility model.

In the figure: 1. a turbine runner; 2. a rotating wheel method disc; 3. a spindle method disc; 4. fixing the main shaft; 5. connecting a law disc; 6. a runner top cover; 7. sealing the base; 8. an outer cover plate; 9. a sealing swivel; 10. a sealing block; 11. a seal ring; 12. a positioning pin; 13. a protective cover; 14. a protective sleeve; 15. an air shroud; 16. a connecting screw; 17. a movable screw; 18. a movable bolt; 19. a movable nut; 20. and (5) a connecting pin.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-2, a spindle sealing structure for a water turbine of a power station in this embodiment includes a water turbine runner 1, a runner method disc 2 is fixedly connected to the top of the water turbine runner 1, a spindle method disc 3 is movably connected to the top of the runner method disc 2, a fixed spindle 4 is fixedly connected to the top of the spindle method disc 3, a connecting method disc 5 is fixedly connected to the top of the fixed spindle 4, a runner top cover 6 is movably connected to the top of the water turbine runner 1, a sealing base 7 is movably connected to the top of the runner top cover 6, an outer cover plate 8 is movably connected to the top of the sealing base 7, a sealing swivel 9 is movably connected to the outer side of the fixed spindle 4, a sealing block 10 is movably connected to the bottom of the sealing swivel 9, and a sealing ring 11 is movably connected to the outer side of the sealing block 10.

The inside swing joint of sealing block 10 has locating pin 12, locating pin 12 and seal base 7 swing joint, and the constant head tank has all been seted up to the inboard of sealing block 10 and seal base 7, and locating pin 12 is located the inboard of constant head tank, and the top swing joint of main shaft law dish 3 has protection casing 13, and the outside swing joint of fixed main shaft 4 has a protective sleeve 14, and the inboard swing joint of protection casing 13 has connecting pin 20, connecting pin 20 and movable screw 17 swing joint.

An air shroud 15 is movably connected between one side of the sealing base 7 opposite to the rotating wheel top cover 6, the main shaft method disc 3 and the rotating wheel method disc 2 are movably connected with the air shroud 15, the inner side of the sealing base 7 is in threaded connection with a connecting screw 16, the bottom end of the connecting screw 16 sequentially penetrates through the sealing base 7 and the rotating wheel top cover 6 and extends to the inner side of the rotating wheel top cover 6, a fixing groove is formed in the top of the sealing base 7, a connector is fixedly connected to the top of the connecting screw 16, and the connector is located in the inner side of the fixing groove.

The inside threaded connection of main shaft law dish 3 has movable screw 17, runner law dish 2 and movable screw 17 threaded connection, the outside swing joint of movable screw 17 has the spring washer, the bottom of movable screw 17 runs through the spring washer in proper order, main shaft law dish 3 and runner law dish 2 and extends to the inboard of runner law dish 2, the top fixedly connected with movable bolt 18 of runner top cap 6, the outside threaded connection of movable bolt 18 has movable nut 19, the top of movable bolt 18 runs through seal base 7 and movable nut 19 in proper order and extends to the top of movable nut 19, movable bolt 18 and seal base 7 swing joint.

Sealing groove has all been seted up to the inboard of seal base 7 and outer apron 8, sealing washer 11 is located the inboard of sealing groove, seal base 7 and outer apron 8 all with sealing washer 11 swing joint, fixed circular slot has been seted up at the top of main shaft law dish 3, the top fixedly connected with screw head of movable screw 17, and screw head and spring washer all are located the inboard of fixed circular slot, protection casing 13 is located the top of screw head, seal base 7 and main shaft law dish 3 swing joint, sealing block 10 is located between seal base 7 and the outer apron 8, seal base 7 and outer apron 8 all with sealing block 10 swing joint.

The sealing base 7 is movably connected with the protective sleeve 14, the air shroud 15 is positioned between the outer sides of the rotating wheel law disc 2 and the main shaft law disc 3, the protective cover 13 is movably connected with the sealing base 7, the rotating wheel law disc 2 is movably connected with the rotating wheel top cover 6, the main shaft law disc 3 is movably connected with the sealing base 7, the protective cover 13 is movably connected with the protective sleeve 14, the protective cover 13 is movably connected with the fixed main shaft 4, the quantity of the connecting screw 16, the movable screw 17 and the connecting pin 20 is designed, the sealing base 7 is made of stainless steel materials, a seat ring, a fixed guide vane drain hole and a volute nose drain hole are arranged on the inner side of the rotating wheel top cover 6, a lubricating water hole is formed on the inner side of the sealing block 10, and a sealing ring groove is formed between the sealing base 7 and the sealing swivel 9.

In addition, through the cooperation effect between runner law dish 2, main shaft law dish 3, fixed main shaft 4, connection law dish 5, runner top cap 6, seal base 7, outer apron 8, sealed swivel 9, sealing piece 10, sealing washer 11, protection casing 13, protect between axle sleeve 14 and the air shroud 15, can effectually seal the junction of hydraulic turbine runner 1 and fixed main shaft 4, through setting up locating pin 12, can guarantee the effect that sealing piece 10 and seal base 7 are fixed a position, through runner law dish 2 and main shaft law dish 3, can link together hydraulic turbine runner 1 and fixed main shaft 4.

Through setting up movable screw 17 and screw head, can guarantee the stability that runner law dish 2 and main shaft law dish 3 are connected, through setting up protection casing 13, can hide movable screw 17 and screw head, can protect movable screw 17 and screw head simultaneously, through setting up the spring washer, can improve the stability that movable screw 17 connects, through setting up fixed circular slot, can hide spring washer and screw head, through setting up movable bolt 18 and movable nut 19, can improve the stability that runner top cap 6 and seal base 7 are connected.

Through setting up connecting pin 20, can connect the location to protection casing 13, through setting up the protection sleeve 14, can protect fixed spindle 4, through setting up air shroud 15, can guarantee the leakproofness between runner law dish 2 and the main shaft law dish 3, through setting up connecting screw 16, can improve the fastness that seal base 7 is connected with runner top cap 6, through setting up sealing washer 11, can guarantee the leakproofness of sealing block 10, through adopting the seal base 7 of stainless steel material, can guarantee the intensity and the hardness of seal base 7, improve seal base 7's life.

The working principle of the embodiment is as follows:

(1) Through the cooperation among the runner law disc 2, the main shaft law disc 3, the fixed main shaft 4, the connecting law disc 5, the runner top cover 6, the sealing base 7, the outer cover plate 8, the sealing swivel 9, the sealing block 10, the sealing ring 11, the protective cover 13, the protective sleeve 14 and the air shroud 15, the joint of the water turbine runner 1 and the fixed main shaft 4 can be effectively sealed, so that the running safety of the water turbine runner 1 and the fixed main shaft 4 is ensured.

(2) The sealing base 7 is fixed on the rotating wheel top cover 6 by adopting a connecting screw 16, a movable bolt 18 and a movable nut 19, the sealing swivel 9 is fixed on the fixed main shaft 4 and rotates together with the fixed main shaft 4, the sealing block 10 is jacked up by using uniform water pressure and contacts with the sealing swivel 9 fixed on the fixed main shaft 4 to form annular sealing water, and a small amount of sealed water leakage automatically flows from the rotating wheel top cover 6 to the water collecting well through the seat ring, the fixed guide vane drain hole and the volute nose drain hole.

(3) The sealing ring grooves on the sealing base 7 and the sealing swivel 9 are arranged at the lower part, so that the sealing ring 11 can be prevented from being in direct contact with the sealing block 10, the friction force in the upward jacking of the working sealing block 10 is reduced, the stainless steel sealing base 7 adopts a structure that a positioning groove is combined with a positioning pin 12, the concentricity of the inner circle and the outer circle of the working sealing block 10 is ensured, and the deformation of the stainless steel sealing base 7 is reduced.

(4) The locating pin 12 is arranged on the sealing block 10 without a through hole, water leakage at the locating pin 12 is reduced, working sealing water pressure of the fixed main shaft 4 is increased, the sealing base 7 is assembled by staggering the sealing block 10 by ninety degrees in a half-face manner, so that the structural strength and concentricity of the sealing base are improved, and later hard force deformation is prevented.

(5) Through the deformation of sealing block 10 material, structural style, mounting means transformation back, the installation in-process appears, through sealing base 7 locating pin 12 and sealing block 10 ninety degrees installations, can effectively resume the deformation to the state after processing, the friction force has been reduced to the transformation of sealing block 10 constant head tank, lubricated apopore and sealing washer 11 position, the pressure of floating up has been increased, the pressure of floating up is greater than or equal to 0.15Mpa, through the power station storehouse water level change operation between 456.6-479, sealing block 10 freely rises and falls and has not had the condition water leakage of jam within the design scope.

Compared with the prior art, the hydraulic turbine has the advantages of simple integral structure, convenience in use, realization of the purpose of good main shaft sealing effect of the hydraulic turbine of the power station, and avoidance of main shaft sealing failure caused by overlarge output power of the hydraulic turbine to the greatest extent, so as to ensure safe operation of the hydraulic turbine unit, prevent damage of the water guide bearing oil basin water inlet guide shaft bushing, avoid unplanned shutdown of the unit, and ensure the generated energy of the power station.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides a main shaft seal structure for power station hydraulic turbine, includes hydraulic turbine runner (1), its characterized in that: the top fixedly connected with runner law dish (2) of hydraulic turbine runner (1), the top swing joint of runner law dish (2) has main shaft law dish (3), the top fixedly connected with fixed spindle (4) of main shaft law dish (3), the top fixedly connected with of fixed spindle (4) connects law dish (5), the top swing joint of hydraulic turbine runner (1) has runner top cap (6), the top swing joint of runner top cap (6) has seal base (7), the top swing joint of seal base (7) has outer cover (8), the outside swing joint of fixed spindle (4) has seal swivel (9), the bottom swing joint of seal swivel (9) has sealing block (10), the outside swing joint of sealing block (10) has sealing washer (11).

2. A spindle seal arrangement for a power station turbine as claimed in claim 1, wherein: the inner side of the sealing block (10) is movably connected with a positioning pin (12), the positioning pin (12) is movably connected with the sealing base (7), positioning grooves are formed in the inner sides of the sealing block (10) and the sealing base (7), and the positioning pin (12) is located in the inner side of each positioning groove.

3. A spindle seal arrangement for a power station turbine as claimed in claim 1, wherein: the top swing joint of main shaft law dish (3) has protection casing (13), the outside swing joint of fixed main shaft (4) has protection sleeve (14), the inboard swing joint of protection casing (13) has connecting pin (20), connecting pin (20) and movable screw (17) swing joint.

4. A spindle seal arrangement for a power station turbine as claimed in claim 1, wherein: an air shroud (15) is movably connected between one side of the sealing base (7) opposite to the rotating wheel top cover (6), and the main shaft method disc (3) and the rotating wheel method disc (2) are movably connected with the air shroud (15).

5. A spindle seal arrangement for a power station turbine as claimed in claim 1, wherein: the inner side of the sealing base (7) is in threaded connection with a connecting screw (16), and the bottom end of the connecting screw (16) sequentially penetrates through the sealing base (7) and the rotating wheel top cover (6) and extends to the inner side of the rotating wheel top cover (6).

6. A spindle seal for a power station turbine as set forth in claim 3, wherein: the novel spindle is characterized in that a movable screw (17) is connected with the inner side of the spindle disc (3) in a threaded mode, the rotating wheel disc (2) is connected with the movable screw (17) in a threaded mode, a spring washer is movably connected with the outer side of the movable screw (17), and the bottom end of the movable screw (17) sequentially penetrates through the spring washer, the spindle disc (3) and the rotating wheel disc (2) and extends to the inner side of the rotating wheel disc (2).

7. A spindle seal arrangement for a power station turbine as claimed in claim 1, wherein: the top of runner top cap (6) fixedly connected with movable bolt (18), the outside threaded connection of movable bolt (18) has movable nut (19), the top of movable bolt (18) runs through sealed base (7) and movable nut (19) in proper order and extends to the top of movable nut (19).

8. A spindle seal arrangement for a power station turbine as claimed in claim 1, wherein: seal grooves are formed in the inner sides of the seal base (7) and the outer cover plate (8), the seal ring (11) is located in the inner sides of the seal grooves, and the seal base (7) and the outer cover plate (8) are movably connected with the seal ring (11).

9. The spindle seal for a power station turbine as set forth in claim 6, wherein: the top of main shaft method dish (3) has seted up fixed circular slot, the top fixedly connected with screw head of movable screw (17), and screw head and spring washer all are located the inboard of fixed circular slot, protection casing (13) are located the top of screw head.

10. A spindle seal arrangement for a power station turbine as claimed in claim 1, wherein: the sealing base (7) is movably connected with the main shaft law disc (3), the sealing block (10) is positioned between the sealing base (7) and the outer cover plate (8), and the sealing base (7) and the outer cover plate (8) are movably connected with the sealing block (10).

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