CN103306888B - A kind of hydraulic control main distributing valve with sequence closing function - Google Patents
A kind of hydraulic control main distributing valve with sequence closing function Download PDFInfo
- Publication number
- CN103306888B CN103306888B CN201310248555.3A CN201310248555A CN103306888B CN 103306888 B CN103306888 B CN 103306888B CN 201310248555 A CN201310248555 A CN 201310248555A CN 103306888 B CN103306888 B CN 103306888B
- Authority
- CN
- China
- Prior art keywords
- hydraulic
- main
- sequence closing
- closing function
- valve plug
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000009471 action Effects 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000011218 segmentation Effects 0.000 claims description 39
- 239000003921 oil Substances 0.000 claims description 37
- 239000010720 hydraulic oil Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 4
- 230000007423 decrease Effects 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 7
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Control Of Water Turbines (AREA)
Abstract
The invention belongs to hydrogovernor field, be specifically related to a kind of hydraulic control main distributing valve with sequence closing function, comprise main valve plug, it is characterized in that: also comprise and to be directly or indirectly connected with main valve plug and to promote the hydraulic jack of main valve plug action, hydraulic jack moves when water turbine sequence closing.The present invention increases sequence closing hydraulic jack, adjustable lever on conventional main control valve, is integrated with sequence closing function, reduces subsection and closed device and makes separately and the cost of site operation, decrease in-site installation space, reduce the pressure loss in system.
Description
Technical field
The invention belongs to hydrogovernor field, be specifically related to a kind of hydraulic control main distributing valve with sequence closing function.
Background technique
Main control valve is the power stage hydraulic pressure amplifier stage of hydrogovernor machinery hydraulic system, the mechanical displacement of electro-control converter or hydraulic control signal are zoomed into hydraulic pressure signal that is respective direction, proportional with it, that meet servomotor traffic requirement by it, control unlatching or the closedown of servomotor.Main control valve promotes servomotor and then promotes hydroturbine water intake mouth stator, to realize the control to hydroturbine water intake flow, thus reaches the object controlling rotational speed of water turbine.
Subsection and closed device be guarantee to have long conduit pipe turbine-generator units under the process of shutdown fast, the water pressure of diversion system can not exceed setting value, and it will ensure that the rotating speed of turbine-generator units is unlikely too high on the other hand.Its concrete implementation is: when turbine-generator units starts to shut down fast, the guide vane opening controlling water turbine water flow can from actual aperture to closed positions, subsection and closed device is utilized to control the rate of discharge of guide vane servomotor, the closing velocity of stator then can be set, usually make stator very fast to the shutdown rate of flex point (as 30% aperture) this section of stroke from 100% aperture, to ensure that the rotating speed of turbine-generator units can decline fast, comparatively slow to the shutdown rate of closed positions from flex point, to ensure that the water pressure of conduit pipe is no more than setting value.
Current water power plant speed regulator main control valve and subsection and closed device adopt two individual components, and subsection and closed device is serially connected with between main control valve and servomotor.During quick shutdown, main control valve is placed in state of shutting down the soonest, and guide vane opening is from fully open position to flex point section, and subsection and closed device exits, and only relies on main control valve to control servomotor quick closedown; During slow shutdown, subsection and closed device drops into, and forms throttling in systems in which, controls servomotor slowly closing.
Said apparatus has following shortcoming: the increase of cost, and existing subsection and closed device adopts self-contained unit, causes the increase of processing and installation cost; On-the-spot required installing space is large, difficult arrangement; There is certain Pressure Drop at subsection and closed device valve port, cause the pressure loss in system.
Summary of the invention
The object of the present invention is to provide a kind of hydraulic control main distributing valve with sequence closing function solving the problems such as the cost that current main control valve and subsection and closed device adopt two self-contained units to cause increases, difficulty in installation and layout, system pressure loss increase.
For achieving the above object, the technical solution used in the present invention is:
There is a hydraulic control main distributing valve for sequence closing function, comprise main valve plug, it is characterized in that: also comprise and to be directly or indirectly connected with main valve plug and to promote the hydraulic jack of main valve plug segmentation action.
Described hydraulic jack moves when water turbine sequence closing.
Aforesaid a kind of hydraulic control main distributing valve with sequence closing function, also comprise the control chamber piston and constant voltage chamber piston that are fixed on main valve plug both sides, hydraulic jack is arranged at the end of control chamber piston or constant voltage chamber piston.
Aforesaid a kind of hydraulic control main distributing valve with sequence closing function, also comprise the collision block being fixed on constant voltage chamber piston, collision block is relative with hydraulic jack position, when water turbine shuts down, guide vane opening arrives flex point, after hydraulic oil port connects pressure oil, hydraulic jack moves to collision block, promotes collision block and moves and then promote constant voltage chamber piston and main valve plug action.
Aforesaid a kind of hydraulic control main distributing valve with sequence closing function, also comprise the adjustable lever of restriction hydraulic jack displacement distance, adjustable lever is relative with the position of hydraulic jack, and the crow flight distance between hydraulic jack and adjustable lever is greater than the crow flight distance between hydraulic jack and collision block.
Aforesaid a kind of hydraulic control main distributing valve with sequence closing function, also comprises the upper end cap be connected with constant voltage chamber piston, the segmentation seat being fixed on upper end cap.
Aforesaid a kind of hydraulic control main distributing valve with sequence closing function, also comprises hydraulic control unit, hydraulic control unit respectively with constant voltage accent, control accent, hydraulic oil port is connected; Hydraulic oil port, as the external control interface of hydraulic jack and pipeline, promotes hydraulic jack action from hydraulic oil port injection pressure oil.In like manner, control accent and control chamber, relation that the relation in constant voltage accent and constant voltage chamber is equal to hydraulic oil port and hydraulic jack.
Aforesaid a kind of hydraulic control main distributing valve with sequence closing function, also comprise and be positioned at upper end upper part of the cover positioning block, be positioned at the available machine time adjusting nut of positioning block both sides and off time adjusting nut, available machine time adjusting nut, the distance of off time adjusting nut respectively and between positioning block is adjustable.
Aforesaid a kind of hydraulic control main distributing valve with sequence closing function, when main control valve runs automatically, hydraulic oil port takes back oil, and hydraulic control unit controls the pressure of accent to drive main valve plug action.
Aforesaid a kind of hydraulic control main distributing valve with sequence closing function, when main control valve emergency shutdown, hydraulic oil port takes back oil, controls accent and takes back oil, main valve plug action under the pressure effect of constant voltage accent.
Aforesaid a kind of hydraulic control main distributing valve with sequence closing function, when main control valve sequence closing, first stage is quick shutdown process: hydraulic oil port takes back oil, the pressure control actions of the controlled accent of main valve plug, and off time adjusting nut is butted on positioning block; When arriving segmentation flex point, start the slow shutdown process of second stage: hydraulic oil port connects pressure oil and controls accent simultaneously and take back oil, and hydraulic jack moves, and promotes collision block and moves with main valve plug, when keeping after hydraulic jack to adjustable lever institute extreme position stablizing.
The present invention increases sequence closing hydraulic jack, adjustable lever on conventional main control valve, is integrated with sequence closing function, reduces subsection and closed device and makes separately and the cost of site operation, decrease in-site installation space, reduce the pressure loss in system.
Accompanying drawing explanation
Fig. 1 is structural drawing of the present invention;
Fig. 2 is the amplification assumption diagram of subsection and closed device of the present invention;
Wherein lower end cap 1, control chamber piston 2, valve body 3, valve pocket 4, main valve plug 5, flange 6, constant voltage chamber piston 7, upper end cap 8, available machine time adjusting nut 9 (a), off time adjusting nut 9 (b), positioning block 10, hydraulic control unit 11, segmentation oil cylinder 12, segmentation seat 13, sectional-regulated bar 14, segmentation collision block 15.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.Following examples only for technological scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Figures 1 and 2, Fig. 2 is the partial enlarged drawing of I part in Fig. 1 to main control valve structural principle of the present invention.Segmentation oil cylinder, segmentation seat, sectional-regulated bar and segmentation collision block in the present invention, segmentation hydraulic fluid port " segmentation " do not refer to that segmentation oil cylinder, segmentation seat, sectional-regulated bar and segmentation collision block, hydraulic fluid port are divided into some sections of compositions, and refer to the sequence closing for main control valve.Segmentation oil cylinder in this specification is hydraulic jack, and sectional-regulated bar is adjustable lever, and segmentation collision block is collision block, and segmentation hydraulic fluid port is hydraulic oil port.
Main control valve is vertical structure, and main valve plug 5 top is constant voltage chamber piston 7, bottom is control chamber piston 2, and control chamber piston 2 area is greater than constant voltage chamber piston 7 area.Constant voltage chamber piston 7 adopts with main valve plug 5 and is threaded and locks, and control chamber piston 2 is independent with main valve plug 5.Constant voltage chamber H normal open system pressure oil, the pressure changing control chamber C by hydraulic control unit 11 carrys out the action of control bound core 5.Valve pocket 4 is provided with valve port, is realized the adjustment of valve port openings of sizes by the action of main valve plug 5, open with the power device that achieves a butt joint, close adjustment and speeds control.Main valve plug 5 neutral position (position of Fig. 1 display is neutral position) upwards corresponds to servomotor opening state, corresponds to servomotor closed condition downwards.It is more that main valve plug 5 departs from neutral position distance, and the hydraulic fluid flow rate of valve port process is larger, and speed is faster.
Available machine time adjusting nut 9 (a), off time adjusting nut 9 (b) are positioned at upper end cap 8 top and are distributed in positioning block 10 both sides.By regulating available machine time adjusting nut 9 (a) respectively, spacing between off time adjusting nut 9 (b) and positioning block 10 regulates the limit position of main valve plug 5 to realize the restriction of the fastest startup and shutdown speed.
Segmentation seat 13 is fixed on upper end cap 8 upper end portion, and its top is segmentation collision block 15, and bottom is segmentation oil cylinder 12.Segmentation collision block 15 is by being screwed on piston 7 top, constant voltage chamber and locking.Segmentation oil cylinder 12 area is greater than constant voltage chamber H area.When driving power is normal, segmentation hydraulic fluid port FD takes back oil through hydraulic control unit 11, and segmentation oil cylinder 12 is held in position shown in Fig. 1; Segmentation oil cylinder 12 can upwards action under the effect of pressure oil, and its limit position is preset by sectional-regulated bar 14.
Main control valve of the present invention has automatic operation, the emergency stop function of conventional main control valve, and increases sequence closing function.
AutoPlay function is specially, and segmentation hydraulic fluid port FD takes back oil, and hydraulic control unit 11 controls the pressure of control chamber C mouth to realize the action of main valve plug 5 to realize the automatic operation of main control valve.
Emergency stop function is specially, and segmentation hydraulic fluid port FD takes back oil, and control chamber C mouth takes back oil, and main valve plug 5 is downward action under the pressure effect of constant voltage chamber H mouth, and servomotor shuts down.
Sequence closing function is specially, and sequence closing first paragraph is shutdown fast, and segmentation hydraulic fluid port FD takes back oil, the downward action of Stress control of main valve plug controlled chamber C mouth, and the off time, adjusting nut 9b was butted on positioning block 10, realizes shutting down fast; When arriving segmentation flex point, segmentation hydraulic fluid port FD welding system pressure oil simultaneously control chamber C mouth takes back oil, segmentation oil cylinder 12 moves upward, promote segmentation collision block 15 with main valve plug 5 upwards action, when segmentation oil cylinder 12 move to by sectional-regulated bar 14 limit limit position time keep stable, segmentation collision block 15 also keeps stable, slowly shuts down to realize servomotor.
It should be noted that the technological scheme be equal to mutually with the present invention comprises: change sequence closing oil cylinder position, as being placed in control chamber underpart of the piston rod; Segmentation seat and upper end cap or lower end cap are processed into one; Do not use segmentation collision block, employing constant voltage chamber piston, control chamber Piston Machining become stepped; Segmentation oil cylinder pushing constant voltage chamber piston or control chamber pistons end even directly promote spool action, and constant voltage chamber piston, control chamber piston also can be understood as a kind of form of hydraulic jack; Employing additive method limits the limit position of sequence closing oil cylinder; The employing additive method limit switch machine time;
Employing additive method controls spool action; Constant voltage chamber piston, control chamber piston, spool be made of one certain two-part one or three all completely independent; Hydraulic control unit can be integrated in one with main control valve, also can as individual components, and hydraulic control unit is not the necessary constituent element of main control valve.
More than show and describe basic principle of the present invention, major character and advantage of the present invention, the technician of the industry should understand.The present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (8)
1. there is a hydraulic control main distributing valve for sequence closing function, comprise main valve plug, it is characterized in that: also comprise and to be directly or indirectly connected with main valve plug and to promote the hydraulic jack that main valve plug realizes segmentation action; Also comprise the control chamber piston that is fixed on main valve plug both sides and constant voltage chamber piston, be fixed on the collision block of constant voltage chamber piston, collision block is relative with hydraulic jack position, when water turbine shuts down, guide vane opening arrives flex point, after hydraulic oil port connects pressure oil, hydraulic jack moves to collision block, promotes collision block and moves and then promote constant voltage chamber piston and main valve plug action.
2. a kind of hydraulic control main distributing valve with sequence closing function according to claim 1, is characterized in that: hydraulic jack is arranged at the end of control chamber piston or constant voltage chamber piston.
3. a kind of hydraulic control main distributing valve with sequence closing function according to claim 1 and 2, is characterized in that: the adjustable lever also comprising restriction hydraulic jack displacement distance, adjustable lever is relative with the position of hydraulic jack.
4. a kind of hydraulic control main distributing valve with sequence closing function according to claim 1, is characterized in that: also comprise hydraulic control unit, hydraulic control unit respectively with constant voltage accent, control accent, hydraulic oil port is connected.
5. a kind of hydraulic control main distributing valve with sequence closing function according to claim 4, it is characterized in that: also comprise and be positioned at upper end upper part of the cover positioning block, be positioned at the available machine time adjusting nut of positioning block both sides and off time adjusting nut, available machine time adjusting nut, the distance of off time adjusting nut respectively and between positioning block is adjustable.
6. a kind of hydraulic control main distributing valve with sequence closing function according to claim 4, is characterized in that: when main control valve runs automatically, hydraulic oil port takes back oil, and hydraulic control unit controls the pressure of accent to drive main valve plug action.
7. a kind of hydraulic control main distributing valve with sequence closing function according to claim 4, is characterized in that: when main control valve emergency shutdown, hydraulic oil port takes back oil, controls accent and takes back oil, main valve plug action under the pressure effect of constant voltage accent.
8. a kind of hydraulic control main distributing valve with sequence closing function according to claim 4, it is characterized in that, when water turbine sequence closing, first stage is quick shutdown process: hydraulic oil port takes back oil, the pressure control actions of the controlled accent of main valve plug, off time adjusting nut is butted on positioning block; When arriving segmentation flex point, start the slow shutdown process of second stage: hydraulic oil port connects pressure oil and controls accent simultaneously and take back oil, and hydraulic jack moves, and promotes collision block and moves with main valve plug, when keeping after hydraulic jack to adjustable lever institute extreme position stablizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310248555.3A CN103306888B (en) | 2013-06-21 | 2013-06-21 | A kind of hydraulic control main distributing valve with sequence closing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310248555.3A CN103306888B (en) | 2013-06-21 | 2013-06-21 | A kind of hydraulic control main distributing valve with sequence closing function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103306888A CN103306888A (en) | 2013-09-18 |
| CN103306888B true CN103306888B (en) | 2015-10-07 |
Family
ID=49132500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310248555.3A Active CN103306888B (en) | 2013-06-21 | 2013-06-21 | A kind of hydraulic control main distributing valve with sequence closing function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103306888B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106015640A (en) * | 2016-06-06 | 2016-10-12 | 哈尔滨电机厂有限责任公司 | Main distributing valve with mechanical hydraulic positioning function |
| CN106089561B (en) * | 2016-06-20 | 2018-08-21 | 哈尔滨电机厂有限责任公司 | Large-scale pumped storage power unit Double-working-condition governor main control valve |
| CN109139352B (en) * | 2018-11-06 | 2024-07-19 | 贵州电网有限责任公司 | Device for judging main and auxiliary actions of water turbine speed regulator and measuring method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2460741Y (en) * | 2000-11-09 | 2001-11-21 | 武汉三联水电控制设备公司 | Hydraulic section shutting off device |
| CN2886156Y (en) * | 2005-11-02 | 2007-04-04 | 武汉聚能电气有限公司 | Flow control type hydraulic main distributing valve capable of automatically returning to center |
| CN2893205Y (en) * | 2006-03-23 | 2007-04-25 | 姚景友 | Multi-protection emergency stop valve |
| CN201730733U (en) * | 2010-08-13 | 2011-02-02 | 天津市科音自控设备有限公司 | Section closing executive device for hydro turbine governing system |
| CN201916109U (en) * | 2011-01-25 | 2011-08-03 | 国网电力科学研究院 | Subsection closing device for hydroelectric generating set |
| CN202431992U (en) * | 2011-11-25 | 2012-09-12 | 天津市科音自控设备有限公司 | Embedded broken line closing execution valve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5569770A (en) * | 1978-11-20 | 1980-05-26 | Hitachi Ltd | Pump turbine control device |
| US7302966B2 (en) * | 2004-11-08 | 2007-12-04 | Schlumberger Technology Corporation | Flow control valve and method |
-
2013
- 2013-06-21 CN CN201310248555.3A patent/CN103306888B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2460741Y (en) * | 2000-11-09 | 2001-11-21 | 武汉三联水电控制设备公司 | Hydraulic section shutting off device |
| CN2886156Y (en) * | 2005-11-02 | 2007-04-04 | 武汉聚能电气有限公司 | Flow control type hydraulic main distributing valve capable of automatically returning to center |
| CN2893205Y (en) * | 2006-03-23 | 2007-04-25 | 姚景友 | Multi-protection emergency stop valve |
| CN201730733U (en) * | 2010-08-13 | 2011-02-02 | 天津市科音自控设备有限公司 | Section closing executive device for hydro turbine governing system |
| CN201916109U (en) * | 2011-01-25 | 2011-08-03 | 国网电力科学研究院 | Subsection closing device for hydroelectric generating set |
| CN202431992U (en) * | 2011-11-25 | 2012-09-12 | 天津市科音自控设备有限公司 | Embedded broken line closing execution valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103306888A (en) | 2013-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204990045U (en) | Fluid flow pressure control device | |
| CN103306888B (en) | A kind of hydraulic control main distributing valve with sequence closing function | |
| CN104089078A (en) | Proportional control device used for linear-stroke valve | |
| CN105814321B (en) | Fluid pressure control device | |
| CN103982475B (en) | A kind of concrete ejection car jib hydraulic control system | |
| CN103628512A (en) | Rotary hydraulic control device of excavator movable arm platform and control method | |
| CN105179335A (en) | Hydraulic steering engine control system | |
| CN203878659U (en) | Constant pressure water supply system applied to spraying system | |
| CN203532152U (en) | Pressure regulating device of hydropower station | |
| CN205243988U (en) | Load pressure adaptive control hydraulic system reaches slot -cutting machine in advance | |
| CN110671383A (en) | Landing leg automatic leveling hydraulic system | |
| CN204826043U (en) | Hillock district's water delivery engineering safety operation schedule system | |
| CN107044458B (en) | A kind of ropeway fluid power system using accumulator pressure regulation | |
| CN101210580A (en) | Star-wheel synchronization hydraulic system for tunneling machine | |
| CN100370115C (en) | Servomotor oil circuit regulating valve assembly of steam turbine regulating system | |
| CN203594061U (en) | Rotation hydraulic control device of excavator movable arm platform | |
| JPH10306766A (en) | Reversible pump-turbine | |
| CN104564510A (en) | Method and device using conical valve for realizing pressure adjusting and ecological drainage functions in hydropower station | |
| CN203309129U (en) | Improved oil regulating valve | |
| CN204664029U (en) | A kind of hydraulic balance system with emergency loop | |
| CN204175690U (en) | Number switch proportion expression electro-control converter | |
| CN209100189U (en) | A kind of governor power down self-sustaining self-closing device | |
| CN204419733U (en) | Anchor restorer control gear | |
| CN105065139A (en) | Motor-driven anti-backfire device for pasty propellant gas generator | |
| CN104948524B (en) | Full-flow combined backpressure device with little pressure fluctuation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171117 Address after: 100761 West Chang'an Avenue, Beijing, No. 86, No. Co-patentee after: State Grid Electric Power Research Insititute Patentee after: State Grid Corporation of China Co-patentee after: NARI Technology Development Co., Ltd. Address before: 100761 West Chang'an Avenue, Beijing, No. 86, No. Co-patentee before: State Grid Electric Power Research Insititute Patentee before: State Grid Corporation of China Co-patentee before: Nanjing Nari Co., Ltd. |