CN108131233B - A kind of tubular turbine guide vane operation protection mechanism - Google Patents
A kind of tubular turbine guide vane operation protection mechanism Download PDFInfo
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- CN108131233B CN108131233B CN201711474280.XA CN201711474280A CN108131233B CN 108131233 B CN108131233 B CN 108131233B CN 201711474280 A CN201711474280 A CN 201711474280A CN 108131233 B CN108131233 B CN 108131233B
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- guide vane
- protection
- connecting rod
- stroke
- control ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/16—Stators
- F03B3/18—Stator blades; Guide conduits or vanes, e.g. adjustable
- F03B3/183—Adjustable vanes, e.g. wicket gates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
Abstract
The invention discloses a kind of tubular turbine guide vane operation protection mechanisms, including guide vane, control ring and guide vane opening and closing operations mechanism, guide vane opening and closing operations mechanism is connect with control ring, the guide vane is connect by guide vane protection mechanism with control ring, the guide vane protection mechanism forms the multi-stage protection to guide vane using at least two class protection structure, it is certain very poor to have that the operation force adjusting of protective effect wherein is generated between every grade of protection structure, it is by the smallest level-one of operation force in multi-stage protection structure that i.e. guide vane protection mechanism, which forms protective effect to guide vane, the operating force transmitted when the guide vane normal shutdown is less than the smallest first class of protection structure of operation force in multi-stage protection structure.The present invention is designed by the cascade protection of multi-stage protection structure; multistage effective protection can be formed, so as to effectively limit movable guide vane position for the different situations of card resistance foreign matter at guide vane; it prevents it to be freely rotated and impact injury is caused to adjacent guide vane, realize the protection purpose of compressor emergency shutdown.
Description
Technical field
The invention belongs to Design of Hydraulic Turbine technical field, in particular to a kind of tubular turbine guide vane operation protection machine
Structure.
Background technique
Tubular turbine working flow is big, channel size is big, and runner inlet valve can not be arranged, and runner passes in and out port strobe
Operation is slow.Therefore tubular turbine gate operating mechanism, which removes, needs to meet common hydraulic turbine gate operating mechanism operation adjusting
Guide vane opening is protected outside the functional requirement of guide vane, it is also necessary to which quick closedown guide vane, cutting water flow realize machine when meeting accident conditions
The functional requirement that group is shut down.
Tubular hydropower station head is low, and tunnel inlets trash rack cannot be overstocked, and trash rack is overstocked to will cause tunnel inlets siltation,
Lose productive head.But trash rack allow by the larger foreign body from blocking to guide vane of size of the foreign matters such as floating log, stone protect
Device is a biggish problem.
As shown in Figure 1, the guide vane anti-block safeguard measure of existing tubular turbine generally uses break pin, spring safety
The structure types such as connecting rod, rubbing device are realized, in addition, operating mechanism mainly passes through double servomotors and weight operation control ring reaches
The purpose for operating guide vane, realizing accidental shutdown, i.e., the guide vane servomotor that control ring two sides are arranged under nominal situation are pushed away by one
One form drawn opens or closes guide vane；When accident conditions (such as servomotor operation oil pressure disappears), control ring is made in weight gravity
With lower rotation, guide vane is driven to close, cutting water flow realizes that unit safety is shut down.There are a drawbacks for the existing scheme: normal
The maximum operating force of guide vane closing is the sum of push/pull power and weight weight of two guide vane servomotors under operating condition, control ring and is led
Water remaining part stress is huge, and the operating force of distribution to each guide vane link is also very big.
Therefore, with unit output, the increase of size, existing guide vane operation, protection machine on Large Type Bulb Turbine
The scheme of structure is because operating force is excessive, and not only the rigidity of unit faces huge challenge, but also the protection of existing guide vane anti-block is arranged
Selection, the design applied also face many problems.
Summary of the invention
It is an object of the invention to: in view of the above problems, one kind is provided and had both been able to achieve all work under nominal situation
Dynamic guide vane synchronization action, and can be reliably achieved non-card resistance guide vane safety when foreign body from blocking occurs for individual guide vanes, close in time
It closes, it is ensured that the tubular turbine guide vane operation protection mechanism that unit safety is shut down.
The technical scheme of the present invention is realized as follows: a kind of tubular turbine guide vane operation protection mechanism, including lead
Leaf, control ring and guide vane opening and closing operations mechanism, guide vane opening and closing operations mechanism is connect with control ring, for controlling guide vane
It opens and closes, it is characterised in that: the guide vane is connect by guide vane protection mechanism with control ring, and the guide vane protection mechanism is adopted
The multi-stage protection to guide vane is formed at least two class protection structure, wherein generating the movement of protective effect between every grade of protection structure
Power adjusting is certain very poor to have, i.e., guide vane protection mechanism to guide vane formed protective effect be by operation force in multi-stage protection structure most
Small level-one starts, and the operating force that when guide vane normal shutdown transmits is less than the smallest level-one of operation force in multi-stage protection structure
Structure is protected, i.e., when guide vane normal shutdown, protection structures at different levels are accordingly to be regarded as rigid structure without generating protective effect.
Tubular turbine guide vane operation protection mechanism of the present invention, the protected mode of the multi-stage protection structure
For after upper level protects structure to reach the protective capability limit, next stage protection structure starts to act, or protected in upper level
When structure starts to carry out protection and be also not up to limit protection ability, next stage protection structure starts to act.
Tubular turbine guide vane operation protection mechanism of the present invention, the guide vane protection mechanism is by hydraulic safe
Connecting rod and bent connecting rod form two-stage cascade protection structure, and the hydraulic safe connecting rod is the protection of the stroke first order, the bending
Connecting rod is the protection of the stroke second level, and circumferentially alternate intervals are arranged for the hydraulic safe connecting rod and bent connecting rod, the stroke
The operation force of protective effect produced by the hydraulic safe connecting rod of first order protection and the bent connecting rod of stroke second level protection is adjusted
Certain very poor to have, when hydraulic safe connecting rod action protection stroke, which meets foreign body from blocking protection, to be required, bent connecting rod is failure to actuate,
When shutdown requires after hydraulic safe connecting rod protection stroke is unable to satisfy foreign body from blocking, respective curved connecting rod overloads bending, is formed
Second level protection to guide vane；Alternatively, the bent connecting rod is the protection of the stroke first order, the hydraulic safe connecting rod is stroke the
Second class protection, protection act with it is above-mentioned exactly the opposite.
Tubular turbine guide vane operation protection mechanism of the present invention, control passes to hydraulic peace when normal shutdown
The operating force of full connecting rod or bent connecting rod is less than hydraulic safe connecting rod or bent connecting rod is used for the operation force of guide vane protection, at this time liquid
Pressure safe connecting rod or bent connecting rod are considered as rigid structure, complete operating force transmitting, close the guide vane.
Tubular turbine guide vane operation protection mechanism of the present invention, the hydraulic safe connecting rod are single-acting chamber
Piston cylinder structure, is full of pressure oil in the acting chamber, and connecting rod is pressurized when shutdown, and control passes to the behaviour of connecting rod when normal shutdown
Make power less than oil pressure in acting chamber；When card resistance foreign matter between two neighboring guide vane, the control ring operation force concentration, the liquid
Safe connecting rod pressure abruptly increase is pressed, the operating force for passing to connecting rod is greater than oil pressure in acting chamber, piston back pressure, and connecting rod shortens,
Remaining guide vane continues to close.
Tubular turbine guide vane operation protection mechanism of the present invention, in the single-acting chamber piston cylinder structure
Card resistance action signal sensor is provided on cylinder body, the card resistance action signal sensor is for piston rod during detection protection
Retract stroke.
Tubular turbine guide vane operation protection mechanism of the present invention, the bent connecting rod are lured using presupposed off-center
Unstability directional curvature structure is led, one end of the bent connecting rod is connected with corresponding guide vane, and the other end is connect with control ring, described
Bent connecting rod is provided with card resistance action signal sensor in the one end connecting with guide vane, and the card resistance action signal sensor is used for
Whether detection bent connecting rod occurs overload bending.
Tubular turbine guide vane operation protection mechanism of the present invention, guide vane opening and closing operations mechanism is by being arranged
Guide vane servomotor and weight in control ring the same side form, and the guide vane servomotor opens guide vane for operating control ring,
Control ring guide vane closing is only operated by the weight under any operating condition.
The present invention is designed by the cascade protection of multi-stage protection structure, can not be sympathized with for card resistance foreign matter at guide vane
Condition, form multistage effective protection prevents it to be freely rotated and causes to adjacent guide vane so as to effectively limit movable guide vane position
Impact injury realizes the protection purpose of compressor emergency shutdown.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of existing tubular turbine guide vane operation protection mechanism.
Fig. 2 is structural schematic diagram of the invention.
Fig. 3 is the structural schematic diagram of guide vane protection mechanism in the present invention.
Fig. 4 is the structural schematic diagram of hydraulic safe connecting rod in the present invention.
Fig. 5 is the structural schematic diagram of bent connecting rod in the present invention.
Fig. 6 is that bent connecting rod overloads curved schematic diagram in the present invention.
Marked in the figure: 1 is guide vane, 2 be control ring, and 3 be hydraulic safe connecting rod, and 4 be bent connecting rod, and 5 be card resistance movement letter
Number sensor, 6 be guide vane servomotor, and 7 be weight, and 8 be card resistance foreign matter, and 9 be acting chamber, and 10 be piston rod, and 11 be cylinder body.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in detail.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Fig. 2, a kind of tubular turbine guide vane operation protection mechanism, including guide vane 1, control ring 2 and guide vane
Opening and closing operations mechanism, guide vane opening and closing operations mechanism are connect with control ring 2, described for controlling the open and close of guide vane 1
Guide vane opening and closing operations mechanism is made of the guide vane servomotor 6 and weight 7 that 2 the same side of control ring is arranged in, the guide vane servomotor 6
Guide vane 1 is opened for operating control ring 2, is only grasped by the weight 7 under any operating condition (including nominal situation and accident conditions)
Make 2 guide vane closing 1 of control ring.
When opening guide vane, servomotor operating force overcomes operation control ring rotation after weight gravity, passes through connecting rod, guide vane lever band
Dynamic guide vane is opened；When guide vane closing, guide vane servomotor is without the power controlled toward guide vane closing direction is pulled, and weight is relative in unit
The gravitational moment operation control ring rotation of heart line, drives guide vane to close, only can meet unit by inserted valve by connecting rod, guide vane lever
Safe and reliable shutdown requirement under all operating conditions.
Guide vane mode of operation has the advantage that compared with prior art in the present invention
1, only one single-acting guide vane servomotor in the present invention, and traditional approach is two double acting guide vane servomotors, therefore
The configuration of the present invention is simple, cost is relatively low.
2, guide vane operating force is small in the present invention, and the reduction of operating force can reduce operating mechanism and want to the rigidity of remaining part
It asks, advantageously ensures that stable operation of unit；More importantly leaving optimization space for guide vane card resistance safeguard measure.
3, speed regulation oil pressure system optimization of the invention.Two double acting guide vane servomotors of traditional approach are become into a nonoculture
With guide vane servomotor, it can bring capacity reduction, pipeline simplification of speed regulation oil hydraulic system etc. that can accordingly be optimized.
Wherein, the guide vane 1 is connect by guide vane protection mechanism with control ring 2, and the guide vane protection mechanism is using at least
Two class protection structure forms the multi-stage protection to guide vane 1, wherein the operation force for generating protective effect between every grade of protection structure is whole
Being set to has certain very poor, i.e., it is the smallest by operation force in multi-stage protection structure that guide vane protection mechanism, which forms protective effect to guide vane,
Level-one starts, and the operating force that when 1 normal shutdown of guide vane transmits, which is less than the smallest level-one of operation force in multi-stage protection structure, to be protected
Protection structure, i.e., when 1 normal shutdown of guide vane, protection structures at different levels are accordingly to be regarded as rigid structure without generating protective effect；It is described more
The protected mode of grade protection structure is after upper level protects structure to reach the protective capability limit, and next stage protection structure starts to move
Make, or when upper level protection structure starts to carry out protection and be also not up to limit protection ability, next stage protection structure is opened
Initiating is made.
As shown in figure 3, in the present embodiment, the guide vane protection mechanism is made of hydraulic safe connecting rod 3 and bent connecting rod 4
Two-stage cascade protection structure, the hydraulic safe connecting rod 3 are the protection of the stroke first order, and the bent connecting rod 4 is the stroke second level
Circumferentially alternate intervals are arranged for protection, the hydraulic safe connecting rod 3 and bent connecting rod 4, the liquid of the stroke first order protection
The operation force adjusting of protective effect produced by the bent connecting rod 4 that pressure safe connecting rod 3 is protected with the stroke second level is certain very poor to have,
When 3 action protection stroke of hydraulic safe connecting rod, which meets foreign body from blocking protection, to be required, bent connecting rod 4 is failure to actuate, only in trash rack
In the case of the small probabilities such as special card resistance form occur in damage or foreign matter, when hydraulic safe connecting rod 3 protects stroke to be unable to satisfy foreign matter
When shutdown requires after card resistance, respective curved connecting rod 4 overloads bending, is formed and is protected to the second level of guide vane, it is ensured that non-card resistance guide vane
It is reliable to close, realize that unit safety is shut down.
As another structure, the bent connecting rod 4 is the protection of the stroke first order, and the hydraulic safe connecting rod 3 is stroke
The second level protection, protection act with it is above-mentioned exactly the opposite.
Control passes to hydraulic safe connecting rod 3 when normal shutdown or the operating force of bent connecting rod 4 is less than hydraulic safe connecting rod 3
Or bent connecting rod 4 is used for the operation force of guide vane protection, hydraulic safe connecting rod 3 or bent connecting rod 4 are considered as rigid structure at this time, complete
Operating force transmitting, closes the guide vane 1.
As shown in figure 4, the hydraulic safe connecting rod 3 is single-acting chamber piston cylinder structure, pressure is full of in the acting chamber 9
Oil, oil pressure can be adjusted accurately, and connecting rod is pressurized when shutdown, and the operating force that control passes to connecting rod when normal shutdown is less than in acting chamber
Oil pressure；When card resistance foreign matter 8 between two neighboring guide vane, 2 operation force concentration of control ring, the hydraulic safe connecting rod 3 is pressed
Power abruptly increase, the operating force for passing to connecting rod are greater than oil pressure in acting chamber, piston back pressure, and connecting rod shortens, remaining guide vane continues to close
It closes, reaches part stage water flow, realize the protection purpose of compressor emergency shutdown；On the cylinder body 11 of the single-acting chamber piston cylinder structure
Be provided with card resistance action signal sensor 5, the card resistance action signal sensor 5 is used to detect protect during piston rod 10
Retract stroke.
As it can be seen in figures 5 and 6, the use of the bent connecting rod 4 presupposed off-center induction instability directional curvature structure, eccentricity e,
One end of the bent connecting rod 4 is connected with corresponding guide vane 1, and the other end is connect with control ring 2, and the bent connecting rod both ends use
Reverse thread connection, is easily installed and adjusts, and the bent connecting rod 4 is provided with card resistance movement letter in the one end connecting with guide vane 1
Number sensor 5, the card resistance action signal sensor 5 is for detecting whether bent connecting rod 4 occurs overload bending.Wherein, described
After its flexure operation brittle failure will not occur for bent connecting rod using good toughness, shock proof 42CrMo material, still can effectively limit
Determine movable guide vane position, prevents it to be freely rotated and impact injury is caused to adjacent guide vane.
The present invention uses the guide vane anti-block cascade protection structure of hydraulic safe connecting rod and bent connecting rod composite structure and shows
Having technical solution to compare has following technical advantage:
1, hydraulic safe connecting rod has the function of on-line automatic recovery.I.e. unit detects that foreign matter is carried out when guide vane card resistance to be grasped
Make, after the foreign matter of card resistance between guide vane is flushed away, connecting rod restores automatically under pressure oil effect, without shutdown manual intervention.It is existing
Some spring safety links also have the function of this, but structure is complicated for spring safety link, weight weight, and connecting rod is because of self weight when operation
The case where leading to connecting rod unbalance loading, can not solve.
2, when the small probabilities such as special card resistance form occur in trash rack damage or foreign matter, hydraulic connecting rod protect stroke without
When method meets that shutdown requires after foreign body from blocking, bent connecting rod overloads bending.Bent connecting rod protects stroke long, almost length of connecting rod
100%, in addition, bent connecting rod also has, structure is simple, light-weight, the replacement engineering technology advantage such as easy, low in cost.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (3)
1. a kind of tubular turbine guide vane operation protection mechanism, including guide vane (1), control ring (2) and guide vane opening and closing operations
Mechanism, guide vane opening and closing operations mechanism are connect with control ring (2), and for controlling the open and close of guide vane (1), feature exists
In: the guide vane (1) is connect by guide vane protection mechanism with control ring (2), and the guide vane protection mechanism is protected using at least two-stage
Protection structure forms the multi-stage protection to guide vane (1), wherein the operation force adjusting for generating protective effect between every grade of protection structure is
Have certain very poor, i.e., it is by the smallest level-one of operation force in multi-stage protection structure that guide vane protection mechanism, which forms protective effect to guide vane,
Start, the operating force that when guide vane (1) normal shutdown transmits is less than the smallest first class of protection of operation force in multi-stage protection structure
Structure, i.e., when guide vane (1) normal shutdown, protection structures at different levels are accordingly to be regarded as rigid structure without generating protective effect;
The protected mode of the multi-stage protection structure is to protect structure to start to carry out protection and be also not up to the limit to protect in upper level
When shield ability, next stage protection structure starts to act, and the guide vane protection mechanism is by hydraulic safe connecting rod (3) and bent connecting rod
(4) two-stage cascade protection structure is formed, the hydraulic safe connecting rod (3) is the protection of the stroke first order, and the bent connecting rod (4) is
Circumferentially alternate intervals are arranged for the protection of the stroke second level, the hydraulic safe connecting rod (3) and bent connecting rod (4), the stroke
The movement of protective effect produced by the hydraulic safe connecting rod (3) of first order protection and the bent connecting rod (4) of stroke second level protection
Power adjusting is certain very poor to have, and when hydraulic safe connecting rod (3) action protection stroke, which meets foreign body from blocking protection, to be required, bending connects
Bar (4) is failure to actuate, and when shutdown requires after hydraulic safe connecting rod (3) protection stroke is unable to satisfy foreign body from blocking, respective curved connects
Bar (4) overloads bending, is formed and is protected to the second level of guide vane；Alternatively, the bent connecting rod (4) is the protection of the stroke first order, institute
State hydraulic safe connecting rod (3) for the stroke second level protection, protection act with it is above-mentioned exactly the opposite;
The hydraulic safe connecting rod (3) is single-acting chamber piston cylinder structure, is full of pressure oil in the acting chamber, connecting rod when shutdown
It is pressurized, the operating force that control passes to connecting rod when normal shutdown is less than oil pressure in acting chamber；When card resistance between two neighboring guide vane
When foreign matter, control ring (2) operation force concentration, hydraulic safe connecting rod (3) the pressure abruptly increase passes to the operating force of connecting rod
Greater than oil pressure in acting chamber, piston back pressure, connecting rod shortens, remaining guide vane continues to close;In the single-acting chamber piston cylinder knot
Card resistance action signal sensor (5) is provided on the cylinder body of structure, the card resistance action signal sensor (5) was protected for detecting
The retract stroke of piston rod in journey;
The bent connecting rod (4) use presupposed off-center induction instability directional curvature structure, one end of the bent connecting rod (4) with it is right
Guide vane (1) is answered to connect, the other end is connect with control ring (2), and bent connecting rod (4) both ends are connected using reverse thread, institute
It states bent connecting rod (4) and the one end connecting with guide vane (1) is provided with card resistance action signal sensor (5), the card resistance movement letter
Number sensor (5) is for detecting whether bent connecting rod (4) occurs overload bending.
2. tubular turbine guide vane operation protection mechanism according to claim 1, it is characterised in that: normal shutdown time control
System passes to hydraulic safe connecting rod (3) and the operating force of bent connecting rod (4) is less than hydraulic safe connecting rod (3) and bent connecting rod (4)
For the operation force of guide vane protection, hydraulic safe connecting rod (3) and bent connecting rod (4) are considered as rigid structure at this time, complete operating force
Transmitting, closes the guide vane (1).
3. tubular turbine guide vane operation protection mechanism as claimed in any of claims 1 to 2, feature exist
In: guide vane opening and closing operations mechanism is made of the guide vane servomotor (6) and weight (7) that control ring (2) the same side is arranged in, institute
It states guide vane servomotor (6) and opens guide vane (1) for operating control ring (2), only operated and controlled by the weight (7) under any operating condition
Ring (2) guide vane closing (1) processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711474280.XA CN108131233B (en) | 2017-12-29 | 2017-12-29 | A kind of tubular turbine guide vane operation protection mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711474280.XA CN108131233B (en) | 2017-12-29 | 2017-12-29 | A kind of tubular turbine guide vane operation protection mechanism |
Publications (2)
| Publication Number | Publication Date |
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| CN108131233A CN108131233A (en) | 2018-06-08 |
| CN108131233B true CN108131233B (en) | 2018-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711474280.XA Active CN108131233B (en) | 2017-12-29 | 2017-12-29 | A kind of tubular turbine guide vane operation protection mechanism |
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| CN (1) | CN108131233B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109281790A (en) * | 2018-09-25 | 2019-01-29 | 江苏大学镇江流体工程装备技术研究院 | A kind of two-way bulb through-flow turbine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61142368A (en) * | 1984-12-12 | 1986-06-30 | Fuji Electric Co Ltd | Guidevane operating device |
| CN202273801U (en) * | 2011-09-16 | 2012-06-13 | 东芝水电设备（杭州）有限公司 | Tubular turbine distributor with dual guide vane protection function |
| CN203515924U (en) * | 2013-10-10 | 2014-04-02 | 成都天保重型装备股份有限公司 | Protective connecting rod used for bulb tubular turbine water guiding mechanism |
| CN204003235U (en) * | 2014-07-03 | 2014-12-10 | 杭州三汇水电设备有限公司 | New type hydraulic turbine stator shutoff device |
| CN204357620U (en) * | 2014-12-30 | 2015-05-27 | 赣州发电设备成套制造有限公司 | Water turbine heavy hammer type water distributor |
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