CN108071619A - Variable pitch hydraulic system and wind power generating set - Google Patents
Variable pitch hydraulic system and wind power generating set Download PDFInfo
- Publication number
- CN108071619A CN108071619A CN201711328570.3A CN201711328570A CN108071619A CN 108071619 A CN108071619 A CN 108071619A CN 201711328570 A CN201711328570 A CN 201711328570A CN 108071619 A CN108071619 A CN 108071619A
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- valve
- variable pitch
- hydraulic system
- oil
- chamber
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- 239000003921 oil Substances 0.000 claims abstract description 130
- 239000000446 fuel Substances 0.000 claims abstract description 40
- 210000000635 valve cell Anatomy 0.000 claims abstract description 24
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 20
- 239000002828 fuel tank Substances 0.000 claims description 33
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 8
- 239000012530 fluid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
-
- 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
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/04—Automatic control; Regulation
-
- 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
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
- F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
-
- 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
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Combustion & Propulsion (AREA)
- Power Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Wind Motors (AREA)
Abstract
The present invention, which provides a kind of variable pitch hydraulic system and wind power generating set, the variable pitch hydraulic system, to be included：Variable pitch oil cylinder has the first small chamber and the first big chamber；Driving unit, driving unit drive the hydraulic oil in variable pitch hydraulic system to form fuel supply path and oil return path；Valve cell is balanced, balance valve cell is connected between variable pitch oil cylinder and driving unit；Control unit, control balance valve cell to make a fuel supply path of draining the oil and pass through in the first small chamber and the first big chamber to another fuel feeding by oil return path.Variable pitch hydraulic system according to an embodiment of the invention accurately controls the stroke of the drive rod of variable pitch oil cylinder, improves the reliability of whole system.Variable pitch hydraulic system according to an embodiment of the invention, oil circuit connection simply are easy to build, bring great convenience for the assembling of wind power generating set and the lifting of blade.
Description
Technical field
The invention belongs to wind-power electricity generation technical group field, more particularly, be related to a kind of variable pitch hydraulic system more particularly to
A kind of variable pitch auxiliary hydraulic system of wind power generating set and the wind power generating set with the variable pitch auxiliary hydraulic system.
Background technology
At present, wind power generating set rotates to adjust windward side and the wind of blade come driving blade by variable pitch hydraulic system
To the angle of formation, so that wind power generating set does not absorb the wind energy more than generating capacity in high wind speed and prevents driving.
Not exclusively need variable pitch in the in-service operation of wind power generating set, wind power generating set assembling process with
And it is also required to variable pitch during leaf blade hanging, it is therefore desirable to flexible the controlling to variable pitch oil cylinder and blade lock pin oil cylinder.
In assembling process, generally driving variable pitch oil cylinder by hydraulic station at present, hydraulic station is only to perform scaling operation
Vertical hydraulic device needs hydraulic station with executing agency's (for example, variable pitch oil cylinder) with oil pipe being connected when in use, you can realizes
Action as defined in various, and by driving device requirement fuel feeding, and direction, pressure and the flow of running of hydraulic power oil are controlled, by electric energy
It is converted into the pressure energy of hydraulic oil.
However, during assembling process and leaf blade hanging, it is very inconvenient using hydraulic station operation variable pitch oil cylinder, and
Pipeline connection is complicated.In addition, existing hydraulic station is present with uncontrollable situation of stretching of variable pitch oil cylinder under power-down state, this
It is breakneck during leaf blade hanging.
The content of the invention
It is an object of the present invention to overcome above-mentioned technical problem.
According to an aspect of the present invention, a kind of variable pitch hydraulic system is provided, which may include：Variable pitch oil
Cylinder, variable pitch oil cylinder have the first small chamber and the first big chamber；Driving unit, driving unit drive the hydraulic oil in variable pitch hydraulic system
To form fuel supply path and oil return path；Valve cell is balanced, balance valve cell is connected between variable pitch oil cylinder and driving unit；Control
Unit processed, control unit control balance valve cell to make one in the first small chamber and the first big chamber to drain the oil simultaneously by oil return path
By fuel supply path to another fuel feeding.
According to an embodiment of the invention, it can be bidirectional hydraulic balanced valve to balance valve cell, the of bidirectional hydraulic balanced valve
One outlet and second outlet connect respectively with the first big chamber and the first small chamber, and control unit can control balance valve cell so as to drain the oil
It is carried out at the same time with fuel feeding.
According to an embodiment of the invention, balance valve cell may include the first balanced valve and the second balanced valve, the first balanced valve
There can be different types in the hydraulic oil path residing for synchronization with the second balanced valve.
According to an embodiment of the invention, variable pitch hydraulic system may also include adjustment unit, and adjustment unit can activate confession simultaneously
Oil return line and oil return circuit.
According to an embodiment of the invention, variable pitch hydraulic system may also include adjustment unit, and adjustment unit may include each other solely
Vertical the first valve unit and the second valve unit, the first valve unit and the second valve unit can be in the controls of control unit
Lower opening and closing.
According to an embodiment of the invention, variable pitch regulation of hydraulic system unit may include reversal valve, and reversal valve may be provided at confession
On the common path in oil circuit footpath and oil return path.
According to an embodiment of the invention, the A mouths of reversal valve and B mouthfuls can enter with the first balanced valve and the second balanced valve respectively
Mouth connection, the outlet of the first balanced valve and the second balanced valve can be connected with the first big chamber and the first small chamber respectively, the P mouths of reversal valve
It can be connected with driving unit, the T mouths of reversal valve can be connected with the first fuel tank of the hydraulic oil for collecting oil return path.
According to an embodiment of the invention, variable pitch hydraulic system may also include the second fuel tank, and driving unit may include to pump, commutation
The P mouths of valve can be connected by pumping with the second fuel tank.
According to an embodiment of the invention, variable pitch hydraulic system may also include the first check valve, the first shut-off valve and speed governing valve,
The outlet of pump may be connected to the entrance of the first check valve, and the outlet of the first check valve may be connected to the entrance of the first shut-off valve, the
The outlet of one shut-off valve may be connected to the entrance of speed governing valve, and the outlet of speed governing valve may be connected to the P mouths of reversal valve.
According to an embodiment of the invention, variable pitch hydraulic system may also include blade lock pin oil cylinder, and blade lock pin oil cylinder can wrap
Include the second small chamber, second largest chamber and the elastomeric element for being arranged on second largest intracavitary.
According to an embodiment of the invention, variable pitch hydraulic system may also include the second check valve and the second shut-off valve, and second is single
It can be connected to the entrance of valve with driving unit, the outlet of the second check valve can be connected with the entrance of the second shut-off valve, the second cut-off
The outlet of valve can be connected with the entrance of the second small chamber.
According to an embodiment of the invention, variable pitch hydraulic system may also include the 3rd shut-off valve and the first fuel tank, the 3rd cut-off
The entrance of valve can be connected with the outlet of the second small chamber, the outlet of the 3rd shut-off valve with the first fuel tank.
According to another aspect of the present invention, a kind of wind power generating set is provided, which includes above-mentioned variable pitch
Hydraulic system.
Variable pitch hydraulic system according to an embodiment of the invention need not employ variable pitch hydraulic station.
Variable pitch hydraulic system according to an embodiment of the invention can be such that variable pitch oil cylinder remains stationary as in the power-off state, with
Improve security.
Variable pitch hydraulic system according to an embodiment of the invention can make the flexible held stationary of the drive rod of variable pitch oil cylinder.
Variable pitch hydraulic system according to an embodiment of the invention can finely tune realization variable pitch, beneficial to the lifting of blade.
Description of the drawings
In conjunction with the accompanying drawings, from the description of the following examples, these and/or other aspects of the present invention and advantage will
It becomes apparent, and it is more readily appreciated that wherein：
Fig. 1 is the schematic diagram of variable pitch oil cylinder according to an embodiment of the invention；
Fig. 2 is the schematic diagram of blade lock pin oil cylinder according to an embodiment of the invention；
Fig. 3 is the schematic diagram of variable pitch auxiliary hydraulic system according to an embodiment of the invention；
Fig. 4 is showing for the first construction of the adjustment unit for showing variable pitch auxiliary hydraulic system according to an embodiment of the invention
It is intended to；
Fig. 5 is showing for the second construction of the adjustment unit for showing variable pitch auxiliary hydraulic system according to an embodiment of the invention
It is intended to；
Fig. 6 is the schematic diagram of variable pitch auxiliary hydraulic system according to an embodiment of the invention.
Drawing reference numeral：
10：Variable pitch oil cylinder；11：First piston；12：Drive rod；S3：First small chamber；S4：First big chamber；S1：Second is small
Chamber；S2：Second largest chamber；20：Blade locked cylinder；21：Second piston；22：Lock pin；30：Balance valve cell；31：First balance
Valve；32：Second balanced valve；40：Adjustment unit；41：First valve unit；42：Second valve unit；46：Reversal valve；50：It drives
Moving cell；60：First fuel tank；70：Second fuel tank；80：Pump；81；First check valve；82：First shut-off valve；83：Speed governing valve；
84：Second check valve；85：Second shut-off valve；86：3rd shut-off valve；90：Filter；91：4th shut-off valve；92：5th cut-off
Valve；93：Accumulator；94：Overflow valve.
Specific embodiment
Variable pitch hydraulic system according to an embodiment of the invention makes variable pitch oil cylinder in the situation of power-off by balanced valve design
Under remain stationary as, to avoid during the assembling process of wind power generating set and leaf blade hanging, variable pitch oil cylinder is undesirably
Movement.
Variable pitch auxiliary hydraulic system according to an embodiment of the invention may be used as lifting and the equipment of wind power generating set
Auxiliary hydraulic system in the process.Hereinafter, the skill of the present invention is described by taking the auxiliary hydraulic system of wind power generating set as an example
Art is conceived, however, the present invention is not limited thereto.
The embodiment of the present invention is described below with reference to accompanying drawings, label identical in the accompanying drawings indicates identical portion always
Part.
Fig. 1 is the schematic diagram of variable pitch oil cylinder according to an embodiment of the invention, and Fig. 2 is leaf according to an embodiment of the invention
The schematic diagram of piece lock pin oil cylinder.
As shown in Figure 1, variable pitch oil cylinder 10 according to embodiments of the present invention may include the first small chamber S3, the first big chamber S4 and
The drive rod 12 being arranged in the first small chamber S3.
Drive rod 12 may be provided on the piston rod (not shown) of variable pitch oil cylinder 10 or be directly connected to first piston 11, become
The first small big chamber S4 of chamber S3 and first of paddle oil cylinder 10 can be separated by first piston 11.
, can be to the first small chamber S3 fuel feeding when needing that drive rod 12 is made to retract, and discharge the hydraulic pressure in the first big chamber S4
Oil., can be to the first big chamber S4 fuel feeding when needing to stretch out drive rod 12, and discharge the hydraulic oil in the first small chamber S3.
One end of variable pitch oil cylinder 10 can be fixedly attached to the wheel hub of wind power generating set, and the other end can be connected by drive rod 12
The speed disk of the pitch variable bearings of wind power generating set is connected to, the outer ring of pitch variable bearings can be fixedly attached to wheel hub, and pitch axis
The inner ring held is connected to blade and speed disk.In addition, the inner ring of pitch variable bearings can be fixedly attached to wheel hub, and pitch variable bearings
Outer ring is connected to blade and speed disk.
As shown in Fig. 2, blade lock pin oil cylinder 20 according to an embodiment of the invention may include the second small chamber S1, second largest chamber
S2 and the lock pin 22 being arranged in the second small chamber S1.
Lock pin 22 may be provided on the piston rod (not shown) of blade lock pin oil cylinder 20 or be directly connected to second piston 21,
Second small chamber S1 of blade lock pin oil cylinder 20 and second largest chamber S2 can be separated by second piston 21.
Unlike variable pitch oil cylinder 10 shown in FIG. 1, bullet is may be provided in the second largest chamber S2 of blade lock pin oil cylinder 20
Property component (for example, spring), elastomeric element may be provided between the inner wall of second largest chamber S2 and second piston 21.
It, can be to the second small chamber S1 fuel feeding when needing that lock pin 22 is made to retract.When needing to stretch out lock pin 22, can make
Second small chamber S1 drains the oil.
Although showing that elastomeric element is arranged in second largest chamber S2 in attached drawing, however, the present invention is not limited thereto, elastomeric element
It may be provided in the second small chamber S1.In this case, when needing that lock pin 22 is made to retract, second largest chamber S2 can be made to drain the oil.
It, can be to second largest chamber S2 fuel feeding when needing to stretch out lock pin 22.
One end of blade lock pin oil cylinder 20 can be fixedly attached to the wheel hub of wind power generating set, and pitch axis is connected in blade
In the case of the inner ring held, installed on the inner ring for the pitch variable bearings that the other end can be inserted into wind power generating set by lock pin 22
The groove of iron block.In the case where blade is connected to the outer ring of pitch variable bearings, the other end can be inserted into wind-force hair by lock pin 22
The groove for the iron block installed on the outer ring of the pitch variable bearings of motor group.
Variable pitch auxiliary hydraulic system according to an embodiment of the invention is described in detail below in conjunction with Fig. 3 to Fig. 6.
Fig. 3 is the schematic diagram of variable pitch auxiliary hydraulic system according to an embodiment of the invention.
As shown in figure 3, according to an embodiment of the invention, variable pitch auxiliary hydraulic system may include variable pitch oil cylinder 10 and balanced valve
Unit 30.
Variable pitch oil cylinder 10 can have the first small big chamber S4 of chamber S3 and first, and balance valve cell 30 can connect with variable pitch oil cylinder 10
It is logical.
Specifically, the first of variable pitch oil cylinder 10 the small big chamber S4 of chamber S3 and first can be respectively arranged with hydraulic fluid port, the quantity of hydraulic fluid port
Can be one or more, in the case where setting multiple hydraulic fluid ports, these hydraulic fluid ports can be known as to oil-feed port and fuel-displaced according to function
Mouthful.In addition, in the case where setting two hydraulic fluid ports, one of hydraulic fluid port is used for fuel feeding, another hydraulic fluid port is for fuel-displaced.
Preferably, the first of variable pitch oil cylinder 10 the small big chamber S4 of chamber S3 and first can be provided only with a hydraulic fluid port, the oil respectively
Mouth can be used as oil-feed port in fuel feeding, and be used as oil outlet when discharging oil.
Although being not shown in Fig. 3, variable pitch auxiliary hydraulic system according to an embodiment of the invention may also include driving
Unit 50 (see Fig. 6) and control unit.
For example, driving unit may include to pump, and the hydraulic oil in variable pitch auxiliary hydraulic system can be driven to form confession
Oil circuit footpath and oil return path.Control unit can control balance valve cell 30 to make the first small chamber S3 and first by oil return path
A fuel supply path of draining the oil and pass through in big chamber S4 is to another fuel feeding.
The present invention attached drawing in, although not shown the construction of control unit, installation site and in system can
The connection relation between component is controlled, but those skilled in the art knows, and control unit may be provided at the machine of wind power generating set
In seat, also can in addition it provide.Control unit may include the controller formed by integrating IC, which can control hydraulic pressure system
Various controllable components in system.For example, control the power supply of various electrical valves, switch or aperture etc..
Optionally, balancing valve cell 30 can connect with the first small big chamber S4 of chamber S3 and first simultaneously, and control unit can
With control balance valve cell 30 so as to the first small chamber S3 fuel feeding and the first big chamber S4 be made to drain the oil be carried out at the same time or make first
Small chamber S3 drains the oil and is carried out at the same time to the first big chamber S4 fuel feeding.
Variable pitch auxiliary hydraulic system according to an embodiment of the invention makes the flexible flat of variable pitch oil cylinder by balanced valve design
Surely, and it in the case where variable pitch auxiliary hydraulic system powers off, can prevent that the drive rod of variable pitch oil cylinder is arbitrarily flexible or rocks.This
Outside, variable pitch auxiliary hydraulic system according to an embodiment of the invention need not employ variable pitch hydraulic station.
As shown in figure 3, balance valve cell 30 according to an embodiment of the invention can be bidirectional hydraulic balanced valve, it may include
First balanced valve 31 and the second balanced valve 32.The first outlet A2 and second outlet B2 of bidirectional hydraulic balanced valve are big with first respectively
The small chamber S3 connections of chamber S4 and first.The first entrance A1 and second entrance B1 of bidirectional hydraulic balanced valve can respectively with driving unit
(for example, transfer tube etc.) connects.
When needing to stretch out drive rod 22, can simultaneously pass through by the first balanced valve 31 to the first big chamber S4 fuel feeding
Second balanced valve 32 makes the first small chamber S3 drain the oil.At this point, the first balanced valve 31 is located on fuel supply path, the second balanced valve 32 is located at
On oil return path.Therefore, in synchronization, the hydraulic oil path residing for the first balanced valve 31 and the second balanced valve 32 can have not
Same type, type difference here refer to the fuel feeding of oil circuit and the difference of oil return purposes.
First balanced valve 31 and the second balanced valve 32 may include check valve and external control sequence valve.For example, when flat by first
When weighing valve 31 to the first big chamber S4 fuel feeding, hydraulic oil can not pass through external control sequence valve by check valve fuel feeding to the first big chamber S4
To the first big chamber S4 fuel feeding.At this point, the hydraulic oil passage path D1 for being fed to the first balanced valve 31 flows to the second balanced valve 32
External control sequence valve, external control sequence valve opens (for example, the aperture of external control sequence valve changes), so that in the first small chamber S3
Hydraulic oil can be flowed out by the second balanced valve 32, and the specific type of flow will be described in more detail below.
Variable pitch hydraulic system according to an embodiment of the invention may also include adjustment unit 40, and adjustment unit 40 can be simultaneously
Activate oil supply loop and oil return circuit.
Fig. 4 is showing for the first construction of the adjustment unit for showing variable pitch auxiliary hydraulic system according to an embodiment of the invention
It is intended to.
The components such as variable pitch oil cylinder 10, balance valve cell 30 shown in Fig. 4 can be identical with corresponding component shown in Fig. 3,
Which is not described herein again.
As shown in figure 4, according to an embodiment of the invention, adjustment unit 40 may include the first valve unit 41 and the second valve
Unit 42, the first valve unit 41 and the second valve unit 42 can open and close under the control of the control unit, so that fuel feeding
Circuit and oil return circuit operate simultaneously.
First valve unit 41 and the second valve unit 42 can be solenoid valves, can be by control unit simultaneously to the first valve
41 and second valve unit 42 of gate cell is powered, so that the first valve unit 41 and the second valve unit 42 are opened.
The operation of first valve unit 41 and the second valve unit 42 can be independent of one another.That is, to 41 He of the first valve unit
The control of second valve unit 42 can be independent of each other.
First valve unit 41 and the second valve unit 42 can include multiple valves respectively.For simplify oil path structure, first
41 and second valve unit 42 of valve unit can only include single solenoid valve respectively, for example, 2/2-way solenoid valve etc..
Although being not shown in Fig. 4, the first valve unit 41 and the second valve unit 42 can be respectively by controllable
Switch element (for example, solenoid valve) is connected to supply reservoir or oil return fuel tank, to be located at fuel supply path in the first valve unit 41
And second valve unit 42 when being located on oil return path, the controllable switch element that control is connected to the first valve unit 41 is beaten
It opens, and opens the controllable switch element for being connected to the second valve unit 42, to realize the confession by the first valve unit 41
Oil and the oil return by the second valve unit 42.
It by above-mentioned construction, can separate fuel supply path and the oil return path of the first big small chamber S3 of chamber S4 and first, and
The fine tuning stretched to the drive rod of variable pitch oil cylinder can be achieved.
Fig. 5 is showing for the second construction of the adjustment unit for showing variable pitch auxiliary hydraulic system according to an embodiment of the invention
It is intended to.
The components such as variable pitch oil cylinder 10, balance valve cell 30 shown in Fig. 5 can portion corresponding to shown in Fig. 3 and Fig. 4
Part is identical, and which is not described herein again.
According to an embodiment of the invention, the adjustment unit 40 of variable pitch auxiliary hydraulic system may include reversal valve 46, reversal valve
46 can be arranged on fuel supply path and the common path in oil return path, and reversal valve 46 can be single hand-operated direction valve, commutation
Valve 46 can also be single solenoid valve.Reversal valve 46 can be various types of solenoid valves, as long as the solenoid valve can control
The fuel supply path of variable pitch oil cylinder 10 and oil return path are activated under the control of unit simultaneously.
Specifically, as shown in figure 5, reversal valve 46 can be three position four-way directional control valve, the A mouths of reversal valve 46 and B mouthfuls can divide
Entrance not with the first balanced valve 31 and the second balanced valve 32 connects, and the outlet of the first balanced valve 31 and the second balanced valve 32 can divide
It is not connected with the first small big chamber S4 of chamber S3 and first, the P mouths of reversal valve 46 are connected with driving unit (for example, transfer tube), commutation
The T mouths of valve 46 can be connected with the fuel tank for the hydraulic oil for collecting oil return path.It is described in detail below in conjunction with Fig. 6 and is changed by single
To valve (for example, solenoid valve) while activate the principle in fuel supply path and oil return path.
Fig. 6 is the schematic diagram of variable pitch auxiliary hydraulic system according to an embodiment of the invention.
The components such as variable pitch oil cylinder 10, balance valve cell 30 shown in Fig. 6 can be to Fig. 3 to the corresponding portion shown in Fig. 5
Part is identical, and which is not described herein again.
Variable pitch auxiliary hydraulic system according to an embodiment of the invention may also include the first fuel tank 60,70 grade portions of the second fuel tank
Part.Driving unit mentioned above can be driving unit 50 as shown in Figure 6, which may include transfer tube 80.
Optionally, above-mentioned driving unit may also include various valves etc..
As shown in fig. 6, the P mouths of reversal valve 46 80 can be connected by pump with the second fuel tank 70, the T mouths of reversal valve 46 can be with
First fuel tank 60 connects.
Variable pitch auxiliary hydraulic system according to an embodiment of the invention may also include the first check valve 81, the first shut-off valve 82
And speed governing valve 83, the outlet for pumping 80 may be connected to the entrance of the first check valve 81, the outlet of the first check valve 81 may be connected to
The entrance of first shut-off valve 82, the outlet of the first shut-off valve 82 may be connected to the entrance of speed governing valve 83, and the outlet of speed governing valve 83 can
It is connected to the P mouths of reversal valve 46.
In addition, the T mouths of reversal valve 46 can be connected to the first fuel tank 60 by filter 90.
When to the first big chamber S4 fuel feeding, and when so that the first small chamber S3 is drained the oil, the controllable component in variable pitch hydraulic booster system
(for example, various valves) can perform under the control of the control unit corresponding operation (power for example, controlling to reversal valve 46, with
Make P mouthfuls to be connected with A mouthfuls, while make B mouthfuls to be connected with T mouthfuls).
In this case, the hydraulic oil in the second fuel tank 70 is under the driving of driving unit 50 (for example, pump 80), successively
Flow through the first check valve 81, the first shut-off valve 82, speed governing valve 83, the P mouths of reversal valve 46 and A mouthfuls, the first balanced valve 31 (for example,
Flow through the check valve in the first balanced valve 31 and without flow through external control sequence valve therein) into the first big chamber S4.At the same time, flow
The second balanced valve 32 can be flowed to along path D1 (for example, flowing in the second balanced valve 32 to 31 middle part liquid separation pressure oil of the first balanced valve
External control sequence valve), so that the oil return path activation of the second balanced valve 32, hydraulic oil in the first small chamber S3 can be successively by the
Two balanced valves 32 (for example, flowing through the external control sequence valve in the second balanced valve 32 and without flow through check valve therein), reversal valve 46
(for example, flow through reversal valve 46 B mouths and T mouthfuls), 90 and first fuel tank 60 of filter.
Similarly, when to the first small chamber S3 fuel feeding, and when so that the first big chamber S4 is drained the oil, in variable pitch hydraulic booster system can
Control component (for example, various valves) can perform corresponding operation and (be supplied for example, controlling to reversal valve 46 under the control of the control unit
Electricity so that A mouthfuls connect with T mouthfuls, while makes P mouthfuls to be connected with B mouthfuls).
In this case, the hydraulic oil in the second fuel tank 70 is under the driving of driving unit 50 (for example, pump 80), successively
Flow through the first check valve 81, the first shut-off valve 82, speed governing valve 83, the P mouths of reversal valve 46 and B mouthfuls, the second balanced valve 32 (for example,
Flow through the check valve in the second balanced valve 31 and without flow through external control sequence valve therein) into the first small chamber S3.At the same time, flow
The first balanced valve 31 can be flowed to along path or direction D2 (for example, flowing to the first balance to 32 middle part liquid separation pressure oil of the second balanced valve
External control sequence valve in valve 31) so that the oil return path of the first balanced valve 31 is activated, the hydraulic oil in the first big chamber S4 can be successively
By the first balanced valve 31 (for example, flowing through the external control sequence valve in the first balanced valve 31 and without flow through check valve therein), change
To valve 46 (for example, flow through reversal valve 46 A mouths and T mouthfuls), 90 and first fuel tank 60 of filter.
Furthermore it is possible to speed governing valve 83 is controlled to control the flow velocity of the hydraulic oil in variable pitch auxiliary hydraulic system, with smoothly
To the first big small chamber S3 fuel feeding of chamber S4 or first, so that the drive rod of variable pitch oil cylinder evenly stretches.In addition, pass through double balanced valves
Design can advantageously avoid between the first big small chamber S3 of chamber S4 and first oil pressure difference variation it is too fast, so as to so that driving
Bar smoothly stretches.
Although showing various valves in Fig. 6, ensureing the situation of variable pitch hydraulic system normal operation and security
Under, part valve therein can be omitted, also can in addition add other valves.
Furthermore variable pitch hydraulic system according to an embodiment of the invention may also include blade locking hydraulic system.For example, root
Blade lock pin oil cylinder 20 is may also include according to the variable pitch hydraulic system of the embodiment of the present invention, blade lock pin oil cylinder 20 may include second
(concrete structure of blade lock pin oil cylinder 20 can for small chamber S1, second largest chamber S2 and the elastomeric element that is arranged in second largest chamber S2
Referring to Fig. 2).
According to an embodiment of the invention, variable pitch auxiliary hydraulic system may also include the second check valve 84 and the second shut-off valve
85.The entrance of second check valve 84 can be connected with driving unit 50, and the outlet of the second check valve 84 can be with the second shut-off valve
85 entrance connection, the outlet of the second shut-off valve 85 can be connected with the entrance of the second small chamber S1 of blade lock pin oil cylinder 20.
Optionally, the outlet of blade lock pin oil cylinder 20 can be connected with the entrance and accumulator 93 of the 3rd shut-off valve 86,
The outlet of 3rd shut-off valve 86 can be connected with the first fuel tank 60, and specifically, the outlet of the 3rd shut-off valve 86 can pass through filtering
Device 90 is connected with the first fuel tank 60.
As shown in fig. 6, variable pitch auxiliary hydraulic system according to an embodiment of the invention may also include overflow valve 94, overflow valve
94 can be arranged between fuel supply path and oil return path, with the maximum pressure of regulating system.Specifically, overflow valve 94 enters
Mouth can be connected with the outlet of the first check valve 81, the outlet of overflow valve 94 with the entrance of filter 90.
Optionally, the first big chamber S4 and oil return may be provided with the 4th cut-off between collecting fuel tank (for example, first fuel tank 60)
Valve 91.Similarly, the first small chamber S3 and oil return may also set up the 5th shut-off valve between collecting fuel tank (for example, first fuel tank 60)
92。
In assembling process and hoisting process, when needing variable pitch, the first shut-off valve the 82, the 3rd can be controlled to end first
Valve 86, the 4th shut-off valve 91, the 5th shut-off valve 92 are closed, and the second shut-off valve 85 of control is opened, by the liquid in the second fuel tank 70
Pressure oil is fed to the second small chamber S1 of blade lock pin oil cylinder 20, so that the lock pin 22 of blade lock pin oil cylinder 20 is retracted.Then, control
The first shut-off valve 82 is made to open and the second shut-off valve 85 is controlled to close, then it is same to the first big chamber S4 progress fuel feeding of variable pitch oil cylinder 10
When the first small chamber S3 is made to drain the oil, with perform variable pitch operation.
In lifting and assembling process, when needing to be directed at the zero graduation line of blade and pitch variable bearings, speed governing can be turned down
Valve 5, and pass through control unit and/or manually adjust valve in system, it can realize the flexible fine motion of variable pitch oil cylinder, be conducive to
The lifting of blade.
In an embodiment of the present invention, the first fuel tank 60 and the second fuel tank 70 can be same fuel tanks, and be used to supply simultaneously
Oil and oil return.
In addition, control unit can control controllable component into variable pitch auxiliary hydraulic system power or make its power-off or to
Controllable component sends control instruction, and drive rod is finally made to perform correct scaling operation according to correct instruction.
In addition, variable pitch hydraulic system according to the abovementioned embodiments of the present invention may also include other kinds of various valves,
The auxiliary components such as pump, sensor.
Variable pitch hydraulic system according to an embodiment of the invention may include in wind power generating set.
Variable pitch hydraulic system according to an embodiment of the invention need not employ variable pitch hydraulic station.
Variable pitch hydraulic system according to an embodiment of the invention can be such that variable pitch oil cylinder remains stationary as in the power-off state, with
Improve security.
Variable pitch hydraulic system according to an embodiment of the invention can make the flexible held stationary of the drive rod of variable pitch oil cylinder.
Variable pitch hydraulic system according to an embodiment of the invention can finely tune realization variable pitch, beneficial to the lifting of blade.
Variable pitch hydraulic system according to an embodiment of the invention accurately controls the stroke of the drive rod of variable pitch oil cylinder, carries
The reliability of high whole system.
Variable pitch hydraulic system according to an embodiment of the invention, oil circuit connection simply are easy to build, and are wind power generating set
Assembling and the lifting of blade bring great convenience.
The foregoing is merely the preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, any
The change or replacement that those familiar with the art is readily apparent that in the technical scope disclosed by the present invention, should all cover
Within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (13)
1. a kind of variable pitch hydraulic system, which is characterized in that including：
Variable pitch oil cylinder (10), the variable pitch oil cylinder (10) have the first small chamber (S3) and the first big chamber (S4)；
Driving unit (50), the driving unit (50) drive the hydraulic oil in the variable pitch hydraulic system to form fuel supply path
With oil return path；
Valve cell (30) is balanced, the balance valve cell (30) is connected to the variable pitch oil cylinder (10) and the driving unit (50)
Between；
Control unit, the described control unit control balance valve cell (30) are described first small to be made by the oil return path
A fuel supply path of draining the oil and pass through in chamber (S3) and the first big chamber (S4) is to another fuel feeding.
2. variable pitch hydraulic system according to claim 1, which is characterized in that the balance valve cell (30) is bidirectional hydraulic
Balanced valve, the first outlet and second outlet of the bidirectional hydraulic balanced valve respectively with the described first big chamber (S4) and described first
The connection of small chamber (S3), the described control unit control balance valve cell (30) so that it is described drain the oil with the fuel feeding simultaneously into
Row.
3. variable pitch hydraulic system according to claim 1, which is characterized in that it is flat that the balance valve cell (30) includes first
Weigh valve (31) and the second balanced valve (32), and first balanced valve (31) and second balanced valve (32) are residing for synchronization
Hydraulic oil path have different types.
4. variable pitch hydraulic system according to claim 3, which is characterized in that further include adjustment unit (40), the adjusting
Unit (40) while activate the oil supply loop and the oil return circuit.
5. variable pitch hydraulic system according to claim 3, which is characterized in that further include adjustment unit (40), the adjusting
Unit (40) includes the first valve unit (41) independent of each other and the second valve unit (42), first valve unit (41)
It can be opened and closed with second valve unit (42) under the control of described control unit.
6. variable pitch hydraulic system according to claim 4, which is characterized in that the adjustment unit (40) includes reversal valve
(46), the reversal valve (46) is arranged on the fuel supply path and the common path in the oil return path.
7. variable pitch hydraulic system according to claim 6, which is characterized in that the A mouths of the reversal valve (46) and B mouthfuls of difference
It is connected with the entrance of first balanced valve (31) and second balanced valve (32), first balanced valve (31) and described
The outlet of two balanced valves (32) connects respectively with the first big chamber (S4) and the first small chamber (S3), the P of the reversal valve (46)
It mouthful is connected with the driving unit (50), the first of the T mouths of the reversal valve (46) and the hydraulic oil in the collection oil return path
Fuel tank (60) connects.
8. variable pitch hydraulic system according to claim 7, which is characterized in that further include the second fuel tank (70), the driving
Unit (50) includes pump (80), and the P mouths of the reversal valve (46) are connected by the pump (80) with second fuel tank (70).
9. variable pitch hydraulic system according to claim 8, which is characterized in that further include the first check valve (81), first section
Only valve (82) and speed governing valve (83), the outlet of the pump (80) are connected to the entrance of first check valve (81), and described first
The outlet of check valve (81) is connected to the entrance of first shut-off valve (82), and the outlet of first shut-off valve (82) is connected to
The entrance of the speed governing valve (83), the outlet of the speed governing valve (83) are connected to the P mouths of the reversal valve (46).
10. the variable pitch hydraulic system according to any one of claim 1-9, which is characterized in that further include blade lock pin oil
Cylinder (20), the blade lock pin oil cylinder (20) include the second small chamber (S1), second largest chamber (S2) and are arranged on described second largest
Elastomeric element in chamber (S2).
11. variable pitch hydraulic system according to claim 10, which is characterized in that further include the second check valve (84) and second
Shut-off valve (85), the entrance of second check valve (84) are connected with the driving unit (50), second check valve (84)
Outlet connected with the entrance of second shut-off valve (85), the outlet of second shut-off valve (85) and the described second small chamber
(S1) entrance connection.
12. variable pitch hydraulic system according to claim 11, which is characterized in that further include the 3rd shut-off valve (86) and first
Fuel tank (60), the entrance of the 3rd shut-off valve (86) and the outlet of the described second small chamber (S1), the 3rd shut-off valve
(86) outlet is connected with first fuel tank (60).
13. a kind of wind power generating set, which is characterized in that including the variable pitch hydraulic pressure system described in any one of claim 1-12
System.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711328570.3A CN108071619B (en) | 2017-12-13 | 2017-12-13 | Variable-pitch hydraulic system and wind generating set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711328570.3A CN108071619B (en) | 2017-12-13 | 2017-12-13 | Variable-pitch hydraulic system and wind generating set |
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| CN108071619B CN108071619B (en) | 2020-03-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112010166A (en) * | 2020-08-26 | 2020-12-01 | 江苏金风科技有限公司 | Blade hoisting tool and hydraulic system thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003172303A (en) * | 2001-12-06 | 2003-06-20 | Ge Medical Systems Global Technology Co Llc | Hydraulic system, method for controlling the same, and x-ray ct device using hydraulic system |
| CN201092931Y (en) * | 2007-06-04 | 2008-07-30 | 无锡宝南机器制造有限公司 | Independent hydraulic pressure oar-changing mechanism for wind generator |
| CN201344098Y (en) * | 2008-12-18 | 2009-11-11 | 上海电气液压气动有限公司 | Blade declination angle changing mechanism |
| CN101576058A (en) * | 2008-12-18 | 2009-11-11 | 上海电气液压气动有限公司 | Hydraulic control system of wind power generating device |
| CN201347838Y (en) * | 2009-01-08 | 2009-11-18 | 新华威尔液压系统(上海)有限公司 | Hydraulic system for wind generating set |
| CN101624970A (en) * | 2008-12-18 | 2010-01-13 | 上海电气液压气动有限公司 | Hydraulic variable propeller system for wind power generation equipment |
| CN204037704U (en) * | 2014-09-03 | 2014-12-24 | 陕西汽车集团有限责任公司 | The wing opening type box van of remote-controlled unlatching and flank start-stop system thereof |
| CN206329455U (en) * | 2016-12-29 | 2017-07-14 | 北京金风科创风电设备有限公司 | Wind power generating set impeller hydraulic locking system |
-
2017
- 2017-12-13 CN CN201711328570.3A patent/CN108071619B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003172303A (en) * | 2001-12-06 | 2003-06-20 | Ge Medical Systems Global Technology Co Llc | Hydraulic system, method for controlling the same, and x-ray ct device using hydraulic system |
| CN201092931Y (en) * | 2007-06-04 | 2008-07-30 | 无锡宝南机器制造有限公司 | Independent hydraulic pressure oar-changing mechanism for wind generator |
| CN201344098Y (en) * | 2008-12-18 | 2009-11-11 | 上海电气液压气动有限公司 | Blade declination angle changing mechanism |
| CN101576058A (en) * | 2008-12-18 | 2009-11-11 | 上海电气液压气动有限公司 | Hydraulic control system of wind power generating device |
| CN101624970A (en) * | 2008-12-18 | 2010-01-13 | 上海电气液压气动有限公司 | Hydraulic variable propeller system for wind power generation equipment |
| CN201347838Y (en) * | 2009-01-08 | 2009-11-18 | 新华威尔液压系统(上海)有限公司 | Hydraulic system for wind generating set |
| CN204037704U (en) * | 2014-09-03 | 2014-12-24 | 陕西汽车集团有限责任公司 | The wing opening type box van of remote-controlled unlatching and flank start-stop system thereof |
| CN206329455U (en) * | 2016-12-29 | 2017-07-14 | 北京金风科创风电设备有限公司 | Wind power generating set impeller hydraulic locking system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112010166A (en) * | 2020-08-26 | 2020-12-01 | 江苏金风科技有限公司 | Blade hoisting tool and hydraulic system thereof |
| CN112010166B (en) * | 2020-08-26 | 2022-09-06 | 江苏金风科技有限公司 | Blade hoisting tool and hydraulic system thereof |
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| CN108071619B (en) | 2020-03-17 |
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