CN213838799U

CN213838799U - Protection device for preventing water return of large-shaft air supply pipeline of mixed-flow hydraulic generator

Info

Publication number: CN213838799U
Application number: CN202021592360.2U
Authority: CN
Inventors: 刘学鸽; 詹奇峰; 王忠强; 马应成; 张延智; 屈伟强; 赵伟; 贾春雷; 刘成东; 谭小刚; 刘博�; 张亚楠
Original assignee: Yellow River Water Resources And Hydropower Development Corp
Current assignee: Yellow River Water Resources And Hydropower Development Corp
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2021-07-30
Anticipated expiration: 2030-08-04

Abstract

A protection device for preventing mixed flow hydraulic generator main shaft moisturizing pipeline is anti-water, be in including setting up the main shaft top is used for the shutoff unit of shutoff main shaft upper end, the shutoff unit is including the outer sleeve that goes up and down to set up, from the top down fixes gradually baffle and installation piece in the outer sleeve, the fixed cylinder that is provided with on the baffle, the piston rod downwardly extending of cylinder and fixedly connected with push pedal, the fixed inner skleeve that is provided with on the installation piece, the push pedal activity sets up in the inner skleeve, annular flow groove has been seted up to the lower part of installation piece, the flow groove is linked together with the inner skleeve through a plurality of passageways, the inner skleeve, it has the fluid all to fill in passageway and the flow groove, annular logical groove has been seted up to the lower part of outer sleeve, it communicates with the flow groove mutually to lead to the groove, the fixed soft ring that is provided with in leading to the groove, and the soft ring will lead to the groove is sealed. The utility model discloses can seal the generator main shaft fast when the condition that the tail water refluences appears after the unit stops to avoid the tail water to flow backwards and cause the oil-water mixture in the oil pan.

Description

Protection device for preventing water return of large-shaft air supply pipeline of mixed-flow hydraulic generator

Technical Field

The utility model relates to a hydraulic generator field, specific protection device for preventing reverse water of mixed flow hydraulic generator main shaft air supplement pipeline that says so.

Background

The hydraulic generator is a generator which takes a hydraulic turbine as a prime mover to convert water energy into electric energy. When water flows through the water turbine, water energy is converted into mechanical energy, a rotating shaft of the water turbine drives a rotor of the generator, and the mechanical energy is converted into electric energy to be output. The mixed-flow hydraulic generator is an important branch of a hydraulic generator, the structure of the mixed-flow hydraulic generator can refer to http:// www.pengky.cn/shuilunji/04-zhuliu SLJ/zhuliu-slj. html, the simplified mixed-flow hydraulic generator comprises a large shaft 5 shared by a hydraulic turbine and a generator, the large shaft 5 is of a hollow structure, at least one guide bearing 6 is fixedly sleeved on the large shaft 5, an oil basin 7 used for providing lubricating oil for the guide bearing 6 is arranged on the peripheral side of the guide bearing 6, an operation table 3 is arranged above the large shaft 5, the large shaft 5 penetrates through the operation table 3, a gap 15 is reserved between the large shaft 5 and the operation table 3, and the lower end of the large shaft 5 is communicated with a tail water pipe 8. In the power generation process, water flows in from the volute of the lower part of the large shaft 5, flows out from the tail water pipe 8 after power generation is completed, negative pressure is formed in the tail water pipe 8 in the flowing process, and in order to avoid deformation and damage of the tail water pipe 8 caused by negative pressure influence, air is required to be supplied into the tail water pipe 8, so that the large shaft 5 is arranged to be of a hollow structure, and air can be supplied into the tail water pipe 8 directly through the large shaft 5. When the sand content of the water flow is large, the tail water pipe 8 is blocked after the unit is shut down, the guide vane of the unit cannot completely stop water, high-pressure water of the volute of the unit gradually flows to the tail water pipe 8, the pressure of the tail water is increased, then the pressure water of the tail water flows up to the operating platform 3 through the large shaft 5, when the water amount is large enough, the water cannot be discharged to the outside in time, the water flows out from the top of the large shaft 5 and flows downwards to each oil basin 7 through the gap 15, the oil basins 7 are subjected to oil-water mixing, the oil basins of the guide bearings 6 need to be cleaned in time, and time and labor are wasted.

SUMMERY OF THE UTILITY MODEL

In order to solve the not enough among the prior art, the utility model provides a protection device for preventing the anti-water of mixed flow hydraulic generator main shaft air supplement pipeline can seal the main shaft fast when the condition that the tail water refluence appears after the unit stops to avoid the tail water to flow backwards and cause the oil-water mixture in the oil pan.

In order to achieve the above object, the utility model discloses a concrete scheme does: a protection device for preventing mixed flow hydraulic generator main shaft moisturizing pipeline is anti-water, be in including setting up the main shaft top is used for the shutoff unit of shutoff main shaft upper end, the shutoff unit is including the outer sleeve that goes up and down to set up, from the top down fixes gradually baffle and installation piece in the outer sleeve, the fixed cylinder that is provided with on the baffle, the piston rod downwardly extending of cylinder and fixedly connected with push pedal, the fixed inner skleeve that is provided with on the installation piece, the push pedal activity sets up in the inner skleeve, annular flow groove has been seted up to the lower part of installation piece, the flow groove is linked together with the inner skleeve through a plurality of passageways, the inner skleeve, it has the fluid all to fill in passageway and the flow groove, annular logical groove has been seted up to the lower part of outer sleeve, it communicates with the flow groove mutually to lead to the groove, the fixed soft ring that is provided with in leading to the groove, and the soft ring will lead to the groove is sealed.

As a further optimization of the protection device for preventing the water return of the large-shaft air supply pipeline of the hydropower station: the top of staff is provided with the operation panel, fixedly on the operation panel be provided with the control chamber, wears to be equipped with the breather pipe on the control chamber, the fixed roof that is provided with in top of control chamber, the shutoff unit is including the fixed pneumatic cylinder that sets up on the roof, the plunger of pneumatic cylinder pass down behind the roof with outer sleeve fixed connection.

As a further optimization of the protection device for preventing the water return of the large-shaft air supply pipeline of the hydropower station: a plurality of guide rods which are vertically arranged are fixedly connected between the operating table and the top plate, a plurality of guide discs which are vertically arranged are fixedly sleeved on the outer sleeve, and the guide rods penetrate through the guide discs.

As a further optimization of the protection device for preventing the water return of the large-shaft air supply pipeline of the hydropower station: and a wind pressure sensor is fixedly arranged on the inner wall of the operating chamber.

As a further optimization of the protection device for preventing the water return of the large-shaft air supply pipeline of the hydropower station: the operating table is fixedly provided with a travel switch, and the guide disc at the lowest part is fixedly connected with an induction plate matched with the travel switch.

As a further optimization of the protection device for preventing the water return of the large-shaft air supply pipeline of the hydropower station: the large shaft penetrates through the operating platform, a gap is reserved between the large shaft and the operating platform, a plurality of water leakage holes are formed in the operating platform, and one of the water leakage holes is provided with a water flow sensor.

As a further optimization of the protection device for preventing the water return of the large-shaft air supply pipeline of the hydropower station: an umbrella-shaped protective cover is fixedly sleeved on the outer wall of the large shaft and is positioned above the gap.

As a further optimization of the protection device for preventing the water return of the large-shaft air supply pipeline of the hydropower station: and a limiting ring is fixedly arranged on the inner wall of the upper end of the inner sleeve, and the piston rod penetrates through an inner hole of the limiting ring.

As a further optimization of the protection device for preventing the water return of the large-shaft air supply pipeline of the hydropower station: and a pressure sensor is fixedly arranged at the bottom of the mounting block.

Has the advantages that: the utility model discloses can seal the macroaxis fast when the condition that the tail water refluence appears after the unit stops to avoid the tail water to flow backwards and cause the oil-water mixture in the oil pan.

Drawings

Fig. 1 is a schematic view of a simplified hydro-generator;

FIG. 2 is a schematic view of the arrangement mode of the plugging unit;

FIG. 3 is a schematic structural diagram of a plugging unit;

fig. 4 is a schematic view of a state in which the blocking unit closes the large shaft.

Description of the drawings: 1-operation room, 2-vent pipe, 3-operation table, 4-protective cover, 5-large shaft, 6-guide bearing, 7-oil basin, 8-draft pipe, 9-hydraulic cylinder, 10-top plate, 11-plunger, 12-guide rod, 13-guide disc, 14-wind pressure sensor, 15-gap, 16-travel switch, 17-pressure sensor, 18-induction plate, 19-outer sleeve, 20-cylinder, 21-partition plate, 22-piston rod, 23-limit ring, 24-inner sleeve, 25-push plate, 26-fluid, 27-installation block, 28-through groove, 29-soft ring, 30-channel, 31-water leakage hole and 32-water flow sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 4, the protection device for preventing water backflow in a large shaft air supply pipeline of a mixed flow type hydraulic generator comprises a plugging unit arranged above a large shaft 5 and used for plugging the upper end of the large shaft 5, the plugging unit comprises an outer sleeve 19 arranged in a lifting manner, a partition plate 21 and a mounting block 27 are sequentially and fixedly arranged in the outer sleeve 19 from top to bottom, an air cylinder 20 is fixedly arranged on the partition plate 21, a piston rod 22 of the air cylinder 20 extends downwards and is fixedly connected with a push plate 25, an inner sleeve 24 is fixedly arranged on the mounting block 27, the push plate 25 is movably arranged in the inner sleeve 24, an annular flow groove is formed in the lower portion of the mounting block 27, the flow groove is communicated with the inner sleeve 24 through a plurality of channels 30, fluids 26 are filled in the inner sleeve 24, the channels 30 and the flow groove, an annular through groove 28 is formed in the lower portion of the outer sleeve 19, the through groove 28 is communicated with the flow groove, a soft ring 29 is fixedly arranged in the through groove 28, and the soft ring 29 seals the through slot 28.

When the tail water mixing device is used, when the tail water pipe 8 is blocked, tail water flows backwards, the outer sleeve 19 moves downwards until the through groove 28 enters the large shaft 5, then the push plate 25 is driven to move downwards through the air cylinder 20, the fluid 26 is pushed by the push plate 25 and flows towards the through groove 28, the through groove 28 is sealed by the soft ring 29, the soft ring 29 is extruded and deformed by the fluid 26, the soft ring 29 protrudes towards the outer side of the through groove 28 until the soft ring 29 contacts the inner wall of the large shaft 5, so that a gap between the outer sleeve 19 and the large shaft 5 is sealed, an inner hole of the large shaft 5 is sealed through the mounting block 27 and the soft ring 29, and the purpose of oil-water mixing caused by the fact that the tail water flows backwards into the oil basin 7 is finally achieved. After the large shaft 5 is closed, the draft tube 8 can be desilted to prepare the restarting of the unit for generating power, and because the unit needs to rotate during the power generation process, if the plugging unit cannot be separated from the large shaft 5 in time, on one hand, air supply interruption can be caused, on the other hand, the soft ring 29 can be worn by the large shaft 5, so that the plugging unit needs to be reset before the unit restarts to generate power, specifically, the push plate 25 is lifted upwards by the air cylinder 20, the fluid 26 flows towards the inner sleeve 24 again under the resetting action of the soft ring 29 after losing the pushing force of the push plate 25 until the soft ring 29 is reset and separated from the large shaft 5, and then the plugging unit is moved upwards integrally until the outer sleeve 19 is separated from the large shaft 5, so that the unit can be restarted.

The utility model discloses can seal 5 macroaxis fast when the condition that appears the tail water refluence after the unit stops to avoid the tail water to flow backwards and cause the oil-water mixture in the oil pan 7.

For the convenience of staff to maintain the unit, the top of macroaxis 5 is provided with operation panel 3, fixedly on the operation panel 3 being provided with control chamber 1, wears to be equipped with breather pipe 2 on the control chamber 1, and the tail water causes production negative pressure in macroaxis 5 and draft tube 8 at the in-process that flows downwards to can breathe in through breather pipe 2 automatically, need not initiative tonifying qi, on this basis, the concrete lift setting mode of shutoff unit is: the top of the operation chamber 1 is fixedly provided with a top plate 10, the plugging unit comprises a hydraulic cylinder 9 fixedly arranged on the top plate 10, and a plunger 11 of the hydraulic cylinder 9 penetrates downwards through the top plate 10 and is fixedly connected with an outer sleeve 19. The hydraulic cylinder 9 is used for driving the plugging unit to move up and down, the response speed and the moving speed are high, and therefore the large shaft 5 can be plugged quickly.

In order to ensure that the outer sleeve 19 can smoothly enter the large shaft 5 and further seal the large shaft 5, a plurality of vertically arranged guide rods 12 are fixedly connected between the operating platform 3 and the top plate 10, a plurality of vertically arranged guide discs 13 are fixedly sleeved on the outer sleeve 19, and the guide rods 12 penetrate through the guide discs 13. The guide rod 12 and the guide disc 13 are matched for guiding the outer sleeve 19, so that the outer sleeve 19 is prevented from deviating from the axis and being incapable of smoothly entering the large shaft 5 after long-term use.

When the tail water flows backwards, airflow can be formed in the operation chamber 1, and in order to realize accurate monitoring of the tail water backflow situation and accurate control of the plugging unit, a wind pressure sensor 14 is fixedly arranged on the inner wall of the operation chamber 1. The air flow in the operation room 1 can be monitored in real time through the wind pressure sensor 14, so that whether the tail water backflow occurs or not can be judged.

In order to accurately control the position of the outer sleeve 19 and further accurately ensure that the large shaft 5 can be smoothly closed, a travel switch 16 is fixedly arranged on the operating platform 3, and an induction plate 18 matched with the travel switch 16 is fixedly connected to the lowest guide disc 13. The switch 16 is formed to cooperate with the sensing plate 18 for monitoring the position of the guide disc 13, so as to obtain the position of the outer sleeve 19, thereby not only ensuring that the soft ring 19 can enter the large shaft 5, but also avoiding the guide disc 13 from colliding with the large shaft 5 and being damaged due to the excessive downward movement of the outer sleeve 19.

In order to further improve the monitoring precision of the tail water backflow situation, the large shaft 5 penetrates through the operating platform 3, a gap 15 is reserved between the large shaft 5 and the operating platform 3, a plurality of water leakage holes 31 are formed in the operating platform 3, and a water flow sensor 32 is arranged in one of the water leakage holes 31. After the tail water flows into the operation chamber 1, the tail water can leak through the water leakage hole 31, when the water flow sensor 32 monitors that water flows exist in the water leakage hole 31, the situation that the tail water flows backwards can be determined, and therefore the large shaft 5 is rapidly sealed through the plugging unit.

Although the plugging unit can rapidly close the large shaft 5, a small amount of tail water flows downwards into the oil basin 7 through the gap 15, in order to avoid the situation, an umbrella-shaped protective cover 4 is fixedly sleeved on the outer wall of the large shaft 5, and the protective cover 4 is positioned above the gap 15. The protective cover 4 is used for guiding the tail water flowing through the gap 15 to the side of the large shaft 5, so that the tail water flows out from the water leakage hole 31 and does not directly flow downwards into the oil basin 7, and the condition of oil-water mixing in the oil basin 7 is avoided.

In order to control the position of the push plate 25 and prevent the push plate 25 from being completely drawn out of the inner sleeve 24 by the cylinder 20, a limit ring 23 is fixedly arranged on the inner wall of the upper end of the inner sleeve 24, and the piston rod 22 passes through the inner hole of the limit ring 23.

After the big shaft 5 is smoothly sealed to solve the problem of tail water backflow, the tail water pipe 8 needs to be desilted to restore the smooth state of the tail water pipe 8, so that the tail water in the big shaft 5 is discharged, and in order to avoid the problem that the tail water backflow is caused by removing the plugging unit under the condition that the tail water is not smoothly discharged, the bottom of the mounting block 27 is fixedly provided with a pressure sensor 17. The pressure sensor 17 can be used for monitoring the pressure of tail water in the large shaft 5 in real time, when the pressure of the tail water is smaller than a set threshold value, the tail water can be judged not to continuously flow to the upper end of the large shaft 5, and at the moment, the plugging unit can be removed.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A protection device for preventing reverse water of mixed flow hydraulic generator main shaft air supplement pipeline, its characterized in that: the device comprises a plugging unit arranged above a large shaft (5) and used for plugging the upper end of the large shaft (5), wherein the plugging unit comprises an outer sleeve (19) arranged in a lifting manner, a partition plate (21) and a mounting block (27) are sequentially and fixedly arranged in the outer sleeve (19) from top to bottom, an air cylinder (20) is fixedly arranged on the partition plate (21), a piston rod (22) of the air cylinder (20) extends downwards and is fixedly connected with a push plate (25), an inner sleeve (24) is fixedly arranged on the mounting block (27), the push plate (25) is movably arranged in the inner sleeve (24), an annular flow groove is formed in the lower part of the mounting block (27), the flow groove is communicated with the inner sleeve (24) through a plurality of channels (30), fluids (26) are filled in the inner sleeve (24), the channels (30) and the flow groove, an annular through groove (28) is formed in the lower part of the outer sleeve (19), and the through groove (28) is communicated with the flow groove, a soft ring (29) is fixedly arranged in the through groove (28), and the through groove (28) is sealed by the soft ring (29).

2. The protection device for preventing the reverse water of the large-shaft air supply pipeline of the mixed-flow hydraulic generator according to claim 1, wherein: the top of staff (5) is provided with operation panel (3), fixedly on operation panel (3) be provided with control chamber (1), wears to be equipped with breather pipe (2) on control chamber (1), the top of control chamber (1) is fixed and is provided with roof (10), the shutoff unit including fixed pneumatic cylinder (9) that set up on roof (10), plunger (11) of pneumatic cylinder (9) pass downwards behind roof (10) with outer sleeve (19) fixed connection.

3. The protection device for preventing the reverse water of the large-shaft air supply pipeline of the mixed-flow hydraulic generator according to claim 2, wherein: a plurality of guide rods (12) which are vertically arranged are fixedly connected between the operating table (3) and the top plate (10), a plurality of guide discs (13) which are arranged up and down are fixedly sleeved on the outer sleeve (19), and the guide rods (12) penetrate through the guide discs (13).

4. The protection device for preventing the reverse water of the large-shaft air supply pipeline of the mixed-flow hydraulic generator according to claim 2, wherein: and a wind pressure sensor (14) is fixedly arranged on the inner wall of the operating room (1).

5. The protection device for preventing the reverse water of the large-shaft air supply pipeline of the mixed-flow hydraulic generator as claimed in claim 3, wherein: the operating platform (3) is fixedly provided with a travel switch (16), and the guide disc (13) at the lowest part is fixedly connected with an induction plate (18) matched with the travel switch (16).

6. The protection device for preventing the reverse water of the large-shaft air supply pipeline of the mixed-flow hydraulic generator according to claim 2, wherein: the large shaft (5) penetrates through the operating platform (3), a gap (15) is reserved between the large shaft (5) and the operating platform (3), a plurality of water leakage holes (31) are formed in the operating platform (3), and a water flow sensor (32) is arranged in one of the water leakage holes (31).

7. The protection device for preventing the reverse water of the large-shaft air supply pipeline of the mixed-flow hydraulic generator as claimed in claim 6, wherein: an umbrella-shaped protective cover (4) is fixedly sleeved on the outer wall of the large shaft (5), and the protective cover (4) is located above the gap (15).

8. The protection device for preventing the reverse water of the large-shaft air supply pipeline of the mixed-flow hydraulic generator according to claim 1, wherein: a limiting ring (23) is fixedly arranged on the inner wall of the upper end of the inner sleeve (24), and the piston rod (22) penetrates through an inner hole of the limiting ring (23).

9. The protection device for preventing the reverse water of the large-shaft air supply pipeline of the mixed-flow hydraulic generator according to claim 1, wherein: and a pressure sensor (17) is fixedly arranged at the bottom of the mounting block (27).