CN210290290U - Hydraulic system for emergent feathering of fan and fan variable pitch execution system - Google Patents
Hydraulic system for emergent feathering of fan and fan variable pitch execution system Download PDFInfo
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- CN210290290U CN210290290U CN201921422089.5U CN201921422089U CN210290290U CN 210290290 U CN210290290 U CN 210290290U CN 201921422089 U CN201921422089 U CN 201921422089U CN 210290290 U CN210290290 U CN 210290290U
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Abstract
The utility model discloses a hydraulic system for fan emergency feathering and a fan variable pitch execution system, wherein the hydraulic system comprises an energy accumulator and a hydraulic cylinder; an outlet oil way of the energy accumulator is communicated with a rodless cavity of the hydraulic cylinder, a feathering valve and a throttling element are arranged on the outlet oil way, and the feathering valve is positioned between the energy accumulator and the throttling element; still include the first branch road parallelly connected with throttling element, be equipped with first liquid accuse check valve on the first branch road, the control hydraulic fluid port and the first work hydraulic fluid port of first liquid accuse check valve are connected with the oil circuit between oar valve and the throttling element in the same direction as, and the second work hydraulic fluid port is connected with the rodless chamber of pneumatic cylinder to dispose into: when the pressure of the control oil port is higher than a first set value, the first working oil port and the second working oil port are not communicated, and when the pressure of the control oil port is not higher than the first set value, the first working oil port is communicated with the second working oil port in a single direction. The hydraulic system can reduce the speed change of the hydraulic cylinder at the initial stage of emergency feathering, slow down the impact and avoid overlong feathering time.
Description
Technical Field
The utility model relates to a wind power generation technical field especially relates to a hydraulic system and fan of urgent feathering of fan become oar actuating system.
Background
In order to ensure the safety of the fan, the variable pitch system of the fan can realize emergency feathering under the condition that the fan is out of power due to any fault, so that each blade of the fan can feather to a stop position.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a conventional hydraulic system for emergency feathering of a fan.
As shown in figure 1, in the hydraulic system for the emergency feathering of the fan, an energy accumulator 1 is used as an emergency energy source to drive blade feathering, an outlet of the energy accumulator 1 is communicated with a rodless cavity of a hydraulic cylinder 4, and a feathering valve 2 and a throttling element 3' are arranged on a communicated oil path. The feathering valve 2 is configured to be closed when electrified and conducted when not electrified, namely, when the feathering valve 2 is electrified, an oil path between the energy accumulator 1 and a rodless cavity of the hydraulic cylinder 4 is cut off, and when the feathering valve 2 is not electrified, the oil path between the energy accumulator 1 and the rodless cavity of the hydraulic cylinder 4 is conducted.
Wherein, one side of the rodless cavity of the hydraulic cylinder 4 is connected with a hub in the fan impeller, and one side with the rod cavity is connected with a rotating ferrule of the variable pitch bearing.
When the fan is in emergency feathering, the system is powered off, the feathering valve 2 is powered off and is in a conducting state, liquid in the energy accumulator 1 flows into a rodless cavity of the hydraulic cylinder 4 through the feathering valve 2 and the throttling element 3', an oil cylinder rod of the hydraulic cylinder 4 is pushed to extend out, and a rotating ferrule of the variable pitch bearing is driven to rotate so as to realize feathering.
Wherein the operating speed of the cylinder rod of the hydraulic cylinder 4 is controlled by means of the throttle element 3'.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating the operation speed of the hydraulic cylinder of the hydraulic system shown in fig. 1 during emergency feathering as a function of time.
In the initial stage of emergency feathering, namely t0-t11, the pressure of the energy accumulator 1 is higher, the liquid discharge speed is high, the speed of the hydraulic cylinder 4 is rapidly increased from 0 to the highest, then, in the initial stage of emergency feathering, namely t11-t12, the high-pressure liquid in the energy accumulator 1 is sufficient, the hydraulic cylinder 4 can be kept at a high speed for a period of time, the speed of the hydraulic cylinder is reduced due to the gradual reduction of the liquid in the energy accumulator 1, and finally, in the middle and later stages of emergency feathering, namely t12-t13, the high-pressure liquid in the energy accumulator 1 is reduced and the pressure is reduced, the speed of the hydraulic cylinder 4 is rapidly reduced until the hydraulic cylinder 4 reaches the stroke end, and the blades are fully feathered to 90 degrees.
The emergency feathering hydraulic system has the following problems in practical application:
at the initial stage of emergency feathering, the speed of the hydraulic cylinder 4 changes sharply, that is, the acceleration is very large, which causes huge impact and affects the service life of relevant parts (such as a variable pitch bearing, a hub and the like) of the fan.
In order to solve the above problems, the conventional practice adopted at present is to reduce the size of the throttling element 3' to increase the flow resistance of the fluid and reduce the discharging speed of the energy accumulator 1, but in this way, the heat generation of the fluid is increased, so that the energy of the fluid stored in the energy accumulator 1 is more consumed on the heat generation, and at the same time, the method reduces the speed of the hydraulic cylinder 4 to slow down the impact, correspondingly, the average speed of the hydraulic cylinder 4 is also reduced, the feathering time is prolonged, and the operation safety of the fan is harmful.
In view of this, how to improve the hydraulic system for emergency feathering of the existing fan, so as to reduce the impact force on the fan during emergency feathering, is a technical problem that needs to be solved by those skilled in the art at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a hydraulic system of urgent feathering of fan, this hydraulic system can reduce the speed change of urgent feathering initial stage pneumatic cylinder, slows down the impact, and simultaneously, the average speed of pneumatic cylinder is higher, avoids feathering time overlength, has ensured the security of fan operation.
Furthermore, the utility model discloses another purpose provides a fan becomes oar actuating system including above-mentioned hydraulic system.
In order to solve the technical problem, the utility model provides a hydraulic system for fan emergency feathering, which comprises an energy accumulator, a feathering valve, a throttling element and a hydraulic cylinder; an outlet oil way of the energy accumulator is communicated with a rodless cavity of the hydraulic cylinder, the feathering valve and the throttling element are arranged on the outlet oil way, and the feathering valve is positioned between the energy accumulator and the throttling element;
the first branch is connected with the throttling element in parallel, a first hydraulic control one-way valve is arranged on the first branch, a control oil port of the first hydraulic control one-way valve is connected with an oil path between the down paddle valve and the throttling element, a first working oil port of the first hydraulic control one-way valve is connected between the down paddle valve and the throttling element, and a second working oil port of the first hydraulic control one-way valve is connected with a rodless cavity of the hydraulic cylinder;
and when the pressure of the control oil port of the first hydraulic control check valve is higher than a first set value, the first working oil port of the first hydraulic control check valve is not communicated with the second working oil port of the first hydraulic control check valve, and when the pressure of the control oil port of the first hydraulic control check valve is not higher than the first set value, the first working oil port of the first hydraulic control check valve is communicated with the second working oil port of the first hydraulic control check valve in a one-way mode.
The hydraulic system of the fan emergency feathering is characterized in that a first branch circuit connected with a throttling element in parallel is additionally arranged on an oil circuit between an energy accumulator and a rodless cavity of a hydraulic cylinder, a first hydraulic control one-way valve is arranged on the first branch circuit, the first hydraulic control one-way valve realizes one-way conduction of the first branch circuit according to the pressure of the oil circuit between the feathering valve and the throttling element, after the first branch circuit is arranged, the size of the throttling element on an outlet oil circuit can be designed to be smaller than that of the prior art, so that the liquid discharge speed of the energy accumulator is reduced at the initial stage of the emergency feathering, the speed change of the hydraulic cylinder at the initial stage is reduced, the impact on the fan at the initial stage of the emergency feathering is reduced, when the pressure of the oil circuit between the feathering valve and the throttling element is reduced to a set value, the first hydraulic control one-way conduction of the first hydraulic control one-way valve is realized, and, therefore, the outlet resistance of the energy accumulator can be reduced, the liquid discharge speed of the energy accumulator is increased, the hydraulic cylinder can keep higher speed at the initial stage of emergency feathering, the average speed of the hydraulic cylinder keeps higher value, the feathering time is prevented from being prolonged, and the running safety of the fan is ensured.
According to the hydraulic system for the emergency feathering of the fan, a pressure sensor is also connected between the outlet of the energy accumulator and the feathering valve; and a first throttling part is further arranged on the first branch, and the first throttling part is positioned between a second working oil port of the first hydraulic control one-way valve and a rodless cavity of the hydraulic cylinder.
In the hydraulic system for emergency feathering of the fan, when the pressure of the control oil port of the first hydraulic control check valve is lower than the first set value and higher than the second set value, the conduction caliber between the first working oil port of the first hydraulic control check valve and the second working oil port of the first hydraulic control check valve is increased along with the reduction of the control oil port pressure of the first hydraulic control check valve, and when the pressure of the control oil port of the first hydraulic control check valve is not higher than the second set value, the conduction caliber between the first working oil port of the first hydraulic control check valve and the second working oil port of the first hydraulic control check valve reaches the maximum value.
The hydraulic system for the emergency feathering of the fan further comprises a second branch connected with the throttling element in parallel, wherein a second hydraulic control one-way valve is arranged on the second branch, a control oil port of the second hydraulic control one-way valve is connected with an oil path between the feathering valve and the throttling element, a first working oil port of the second hydraulic control one-way valve is connected between the feathering valve and the throttling element, and a second working oil port of the second hydraulic control one-way valve is connected with a rodless cavity of the hydraulic cylinder;
and when the pressure of the control oil port of the second hydraulic check valve is higher than a third set value, the first working oil port of the second hydraulic check valve is not communicated with the second working oil port of the second hydraulic check valve, and when the pressure of the control oil port of the second hydraulic check valve is not higher than the third set value, the first working oil port of the second hydraulic check valve is communicated with the second working oil port of the second hydraulic check valve in a one-way mode.
In the hydraulic system for emergency feathering of the fan, the third set value is smaller than the first set value.
The hydraulic system for the emergency feathering of the fan further comprises a second branch connected with the throttling element in parallel, wherein a second hydraulic control one-way valve is arranged on the second branch, a control oil port of the second hydraulic control one-way valve is connected with an oil path between the feathering valve and the throttling element, a first working oil port of the second hydraulic control one-way valve is connected between the feathering valve and the throttling element, and a second working oil port of the second hydraulic control one-way valve is connected with a rodless cavity of the hydraulic cylinder;
and when the pressure of the control oil port of the second hydraulic check valve is higher than a third set value, the first working oil port of the second hydraulic check valve is not communicated with the second working oil port of the second hydraulic check valve, and when the pressure of the control oil port of the second hydraulic check valve is not higher than the third set value, the first working oil port of the second hydraulic check valve is communicated with the second working oil port of the second hydraulic check valve in a one-way mode.
In the hydraulic system for emergency feathering of the fan, the third set value is not greater than the second set value.
In the hydraulic system for emergency feathering of the fan, when the pressure of the control oil port of the second hydraulic check valve is lower than a third set value and higher than a fourth set value, the conduction caliber between the first working oil port of the second hydraulic check valve and the second working oil port of the second hydraulic check valve is increased along with the reduction of the pressure of the control oil port of the second hydraulic check valve, and when the pressure of the control oil port of the second hydraulic check valve is not higher than the fourth set value, the conduction caliber between the first working oil port of the second hydraulic check valve and the second working oil port of the second hydraulic check valve reaches the maximum value.
According to the hydraulic system for the emergency feathering of the fan, the second branch is further provided with a second throttling component, and the second throttling component is located between a second working oil port of the second hydraulic control one-way valve and a rodless cavity of the hydraulic cylinder.
The utility model also provides a fan variable-pitch execution system, which comprises a power device and a hydraulic cylinder, wherein one side of a rodless cavity of the hydraulic cylinder is connected with a hub in a fan impeller, one side of a rod cavity of the hydraulic cylinder is connected with a rotating ferrule of a variable-pitch bearing, and the power device is used for controlling the expansion of an oil cylinder rod of the hydraulic cylinder; the hydraulic system for the emergency feathering of the fan is further included.
Since the hydraulic system for the emergency feathering of the fan has the technical effects, the fan pitch control execution system comprising the hydraulic system also has the same technical effects, and the discussion is not repeated here.
Drawings
FIG. 1 is a schematic structural diagram of a hydraulic system for emergency feathering of a conventional fan;
FIG. 2 is a schematic diagram of the hydraulic system of FIG. 1 illustrating the operating speed of the hydraulic cylinder during emergency feathering as a function of time;
fig. 3 is a schematic structural diagram of a specific embodiment of a pitch control system of a wind turbine provided by the present invention;
FIG. 4 is a schematic diagram illustrating a comparison of a velocity profile of a hydraulic cylinder of the hydraulic system of FIG. 3 with a velocity profile of a hydraulic cylinder of the hydraulic system of FIG. 1;
fig. 5 is a schematic structural diagram of another embodiment of a pitch control system of a wind turbine according to the present invention.
Description of reference numerals:
the energy accumulator 1, the feathering valve 2, the throttling elements 3 and 3' and the hydraulic cylinder 4;
the hydraulic control check valve 5, a control oil port 51, a first working oil port 52, a second working oil port 53, a throttling part 6, a pressure sensor 7 and a power device 8;
the hydraulic control system comprises a first hydraulic control check valve 5a, a control oil port 51a, a first working oil port 52a, a second working oil port 53a, a second hydraulic control check valve 5b, a control oil port 51b, a first working oil port 52b, a second working oil port 53b, a first throttling part 6a and a second throttling part 6 b.
Detailed Description
In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.
For simplicity of understanding and description, the following description is combined with a fan pitch control execution system and a hydraulic system of fan emergency feathering, and the beneficial effects are not repeatedly discussed.
Please refer to fig. 3, fig. 3 is a simplified structural diagram of a specific embodiment of a pitch-controlled system of a wind turbine according to the present invention, and the simplified structural diagram of the pitch-controlled system of the wind turbine includes a structure of a hydraulic system for emergency feathering of the wind turbine.
In this embodiment, the fan pitch control execution system includes a power device 8 and a hydraulic cylinder 4, wherein the power device 8 includes a hydraulic pump, a hydraulic oil tank, a valve assembly and other components, the power device 8 is provided with an oil path communicated with a rodless cavity of the hydraulic cylinder 4 and an oil path communicated with a rod cavity of the hydraulic cylinder 4, one side of the rodless cavity of the hydraulic cylinder 4 is connected with a hub in the fan impeller, and one side of the rod cavity of the hydraulic cylinder 4 is connected with a rotating ring of a pitch control bearing.
By controlling the relevant valve components of the power device 8, the telescopic control of the oil cylinder rod of the hydraulic cylinder 4 can be realized, so that the rotating ring of the variable pitch bearing of the fan is driven to rotate, and the variable pitch of the blade is realized. The power device 8 works when the system is powered on, and the power device 8 cannot work when the system is powered off.
The fan variable-pitch execution system further comprises a hydraulic system for the fan emergency feathering, the hydraulic system for the fan emergency feathering is improved, the structure of the hydraulic system is described in detail in the following, the specific structural composition of the power device 8 can refer to the conventional design, and the detailed description is omitted.
In the embodiment, the hydraulic system for the emergency feathering of the fan comprises an energy accumulator 1, an outlet oil path of the energy accumulator 1 is communicated with a rodless cavity of a hydraulic cylinder 4, a feathering valve 2 and a throttling element 3 are arranged on the outlet oil path, and the feathering valve 2 is positioned between the energy accumulator 1 and the throttling element 3.
The feathering valve 2 is used for controlling the on-off of an oil path between the energy accumulator 1 and the hydraulic cylinder 4, and specifically, the feathering valve 2 is configured to be switched on when power is lost and switched off when power is obtained; under the power-on state of a fan variable pitch execution system, the feathering valve 2 is in a power-on closed state, namely an oil path between the energy accumulator 1 and a rodless cavity of the hydraulic cylinder 4 is cut off, and the expansion and contraction of a cylinder rod of the hydraulic cylinder 4 are controlled through the power device 8 so as to realize the variable pitch of the blades; when emergency feathering is needed, the system is powered off, the feathering valve 2 is in a power-off conduction state, namely, an oil way between the accumulator 1 and the rodless cavity of the hydraulic cylinder 4 is conducted, and at the moment, the power device 8 does not work.
The outlet of the energy accumulator 1 is provided with a pressure sensor 7 for detecting the pressure of the energy accumulator 1, a pressure value can be set in advance, when the outlet pressure of the energy accumulator 1 is lower than the set value, the energy accumulator 1 is charged, wherein the related structure for charging the energy accumulator 1 can be the same as the prior design.
As shown in fig. 3, in this embodiment, the hydraulic system for fan emergency feathering further includes a branch connected in parallel with the throttling element 3, a pilot operated check valve 5 is disposed on the branch, the pilot operated check valve 5 has a control oil port 51, a first working oil port 52 and a second working oil port 53, wherein the control oil port 51 is connected to an oil path between the feathering valve 2 and the throttling element 3, the first working oil port 52 is connected to an oil path between the feathering valve 2 and the throttling element 3, the second working oil port 53 is connected to a rodless cavity of the hydraulic cylinder 4, and the pilot operated check valve 5 realizes one-way conduction and closing of the first working oil port 52 to the second working oil port 53 by controlling the control oil port 51.
The pilot operated check valve 5 is specifically configured to: when the pressure of the control port 51 is higher than the first set value, the first working port 52 and the second working port 53 are not connected, and when the pressure of the control port 51 is not higher than the first set value, the first working port 52 is unidirectionally connected to the second working port 53.
In a specific scheme, the hydraulic system is further provided with a throttling part 6 on a branch where the pilot operated check valve 5 is located, and the throttling part 6 is located between a second working oil port of the pilot operated check valve 5 and a rodless cavity of the hydraulic cylinder 4 so as to control the outflow speed of the liquid of the energy accumulator 1 on the branch.
The specific dimensions of the throttle member 6 and the throttle element 3 may be determined according to the actual conditions of the fan.
When the fan is in emergency feathering, the feathering valve 2 is powered off and conducted, high-pressure liquid in the energy accumulator 1 flows into a rodless cavity of the hydraulic cylinder 4 through the feathering valve 2 and the throttling element 3, the pressure of an outlet of the energy accumulator 1 is reduced along with the outflow of the liquid of the energy accumulator 1, after the pressure of a control oil port 51 of the hydraulic control one-way valve 5 is not higher than a first set value, the first working oil port 52 is conducted to a second working oil port 53 in a one-way mode, and at the moment, the liquid of the energy accumulator 1 flows to the rodless cavity of the hydraulic cylinder 4 through an oil path where the throttling element 3 is located and flows to the rodless cavity of the hydraulic cylinder 4 through a branch where the hydraulic control one-way valve 5 is located, so.
After the above arrangement, the size of the throttling element 3 in this embodiment can be designed smaller than that of the prior art, so that in the initial stage of the emergency feathering, the discharging speed of the energy accumulator 1 can be reduced, the speed change of the hydraulic cylinder 4 in the initial stage is reduced, and the impact on the fan in the initial stage of the emergency feathering is reduced, when the pressure of the oil path between the feathering valve 2 and the throttling element 3 is reduced to a first set value, the first working oil port 52 and the second working oil port 53 of the pilot operated check valve 5 are conducted in a single direction, and the oil in the energy accumulator 1 flows into the rodless cavity of the hydraulic cylinder 4 through the oil path where the throttling element 3 is located and the branch where the pilot operated check valve 5 is located, so that the outlet resistance of the energy accumulator 1 can be reduced, the discharging speed of the energy accumulator 1 is increased, and in the initial stage of the emergency feathering, the hydraulic cylinder 4 can keep a, the feathering time is prevented from being prolonged, and the running safety of the fan is ensured.
It should be noted that the size of the throttling element 3 is determined according to the condition of the fan in practical application, and for the same fan, the size of the throttling element 3 in the hydraulic system provided by the embodiment can be designed to be smaller than that of the existing design.
Referring also to fig. 4, fig. 4 is a schematic diagram illustrating a speed curve of a hydraulic cylinder of the hydraulic system shown in fig. 3 in comparison with a speed curve of a hydraulic cylinder of the hydraulic system shown in fig. 1.
In fig. 4, the solid line represents the speed curve of the hydraulic cylinder of the hydraulic system shown in fig. 1, and the dotted line represents the speed curve of the hydraulic cylinder of the hydraulic system shown in fig. 3.
Due to the structural design of the hydraulic system in the embodiment, the size of the throttling element 3 can be designed to be smaller than that of the existing design, the speed of the hydraulic cylinder 4 in the emergency feathering starting stage t0-t21 in the embodiment is relatively slowly increased, the speed of the hydraulic cylinder 4 in the emergency feathering starting stage t0-t11 in the prior art is relatively quickly increased, and the impact of the scheme on the fan in the starting stage is restrained; in the embodiment, the speed of the hydraulic cylinder 4 is reduced slowly in the initial stage t21-t22 of the emergency feathering, the speed of the hydraulic cylinder 4 is reduced rapidly in the initial stage t11-t12 of the emergency feathering in the prior art, and in comparison, in the initial stage of the emergency feathering, the average speed of the hydraulic cylinder 4 is higher in the scheme, so that the relatively low average speed in the initial stage is compensated, because the branch in which the hydraulic control one-way valve 5 is located is conducted in the stage, the liquid discharge resistance of the energy accumulator 1 is reduced, and the heat loss is controlled.
As shown in fig. 4, t23 of this embodiment is slightly larger than t13 of the prior art, that is, the time of emergency feathering in this embodiment is relatively slightly larger, but the time of emergency feathering can also be adjusted by controlling the size of the throttling element 6 on the branch.
In a further scheme, the pilot operated check valve 5 may further adjust the size of the passage along with the pressure change of the control port 51, specifically, when the pressure of the control port 51 is lower than a first set value and higher than a second set value, the conduction diameter between the first working port 52 and the second working port 53 increases along with the decrease of the pressure of the control port 51, and when the pressure of the control port 51 is not higher than the second set value, the conduction diameter between the first working port 52 and the second working port 53 reaches a maximum value.
After the arrangement, the hydraulic system can automatically adjust the liquid discharging speed of the energy accumulator 1 according to the pressure change behind the feathering valve 2, so that the action of the hydraulic cylinder 4 is more stable, and the impact on the fan is further reduced.
In the above embodiment, the hydraulic system is provided with one branch connected in parallel with the throttling element 3, in other embodiments, the hydraulic system for emergency feathering of the fan may also be provided with more than two branches connected in parallel with the throttling element 3, each branch is provided with a hydraulic control one-way valve and a throttling component connected in series, the related arrangement of the hydraulic control one-way valves may be similar to that of the above embodiment, and the branches are sequentially conducted according to the difference of the oil circuit pressure between the feathering valve 2 and the throttling element 3, so that the liquid discharge speed of the energy accumulator 1 can be more accurately controlled, and the safety and reliability of the fan during emergency feathering can be ensured.
It will be appreciated that the greater the number of branches connected in parallel with the throttling element 3, the more complex the structure of the hydraulic system and the more practical it can be arranged as desired.
The arrangement of the relevant components in the two branches will be briefly described below by taking as an example that the hydraulic system is provided with two branches connected in parallel with the throttling element 3, and the arrangement of the other number of branches may be similar and will not be described one by one.
Referring to fig. 5, fig. 5 is a schematic structural diagram of another embodiment of a pitch control system of a wind turbine according to the present invention.
In this embodiment, the hydraulic system of the fan emergency feathering is provided with two branches connected in parallel with the throttling element 3.
The first branch is provided with a first pilot-controlled check valve 5a, a control oil port 51a of the first pilot-controlled check valve 5a is connected with an oil path between the paddle valve 2 and the throttling element 3, a first working oil port 52a is connected with an oil path between the paddle valve 2 and the throttling element 3, and a second working oil port 53a is connected with a rodless cavity of the hydraulic cylinder 4 and is configured as follows: when the pressure of the control port 51a of the first pilot operated check valve 5a is higher than the first set value P1, the first working port 52a and the second working port 53a are not connected, and when the pressure of the control port 51a of the first pilot operated check valve 5a is not higher than the first set value P1, the first working port 52a and the second working port 53a are connected in a unidirectional manner.
Be equipped with second hydraulic control check valve 5b on the second branch road, the control hydraulic fluid port 51b of second hydraulic control check valve 5b is connected with the oil circuit between oar valve 2 and the throttling element 3 in the same direction as, first work hydraulic fluid port 52b is connected with the oil circuit between oar valve 2 and the throttling element 3 in the same direction as, second work hydraulic fluid port 53b is connected with the rodless chamber of pneumatic cylinder 4 to the configuration becomes: when the pressure of the control port 51b of the second hydraulic check valve 5b is higher than the third set value P3, the first working port 52b and the second working port 53b are not connected, and when the pressure of the control port 51b of the second hydraulic check valve 5b is not higher than the third set value P3, the first working port 52b and the second working port 53b are connected in a one-way manner.
When the hydraulic feathering device is arranged specifically, the third set value P3 is smaller than the first set value P1, so that in an emergency feathering process, in the first stage, the liquid of the energy accumulator 1 flows to the rodless cavity of the hydraulic cylinder 4 only through the oil path where the throttling element 3 is located, in the second stage, the first hydraulic control one-way valve 5a on the first branch is conducted in a one-way mode, the liquid of the energy accumulator 1 flows to the rodless cavity of the hydraulic cylinder 4 through the oil path where the throttling element 3 is located and the first branch, in the third stage, the second hydraulic control one-way valve 5b on the second branch is also conducted in a one-way mode, and the liquid of the energy accumulator 1 flows to the rodless cavity of the hydraulic cylinder 4 through the oil path. Therefore, the liquid discharging speed of the energy accumulator 1 is controlled according to the pressure.
Wherein, the magnitudes of the first set point P1 and the third set point P2 are adjusted according to actual requirements.
On the basis, the first branch is provided with the first throttling part 6a, the second branch is provided with the second throttling part 6b, the throttling size is set according to actual requirements, and the stability of the action of the hydraulic cylinder 4 can be ensured.
In a specific scheme, the first pilot-controlled check valve 5a in the first branch can also adjust the size of the passage according to the pressure change of the pilot oil port 51a, so as to more accurately control the discharging speed of the accumulator 1.
Specifically, when the pressure of the control port 51a of the first pilot operated check valve 5a is lower than the first set value P1 and higher than the second set value P2, the conduction port diameter between the first working port 52a and the second working port 53a thereof increases as the pressure of the control port 51a decreases, and reaches the maximum value when the pressure of the control port 51a is not higher than the second set value P2.
On the basis, if the opening diameter of the second pilot check valve 5b of the second branch is not adjustable, the third set value P3 of the second pilot check valve 5b is preferably not greater than the second set value P2, that is, the second branch is opened after the opening diameter of the first pilot check valve 5a reaches the maximum.
Of course, the second hydraulic check valve 5b of the second branch can also adjust the size of the passage according to the pressure change of the control oil port 51b thereof. Specifically, when the pressure of the control port 51b of the second check valve 5b is lower than the third set value P3 and higher than the fourth set value P4, the conduction port diameter between the first working port 52b and the second working port 53b increases as the pressure of the control port 51b decreases, and reaches the maximum value when the pressure of the control port 51b is not higher than the fourth set value P4. At this time, the third set value P3 is also preferably set to be not greater than the second set value P2, that is, after the opening diameter of the first pilot operated check valve 5a reaches the maximum, the second branch is opened and the opening diameter of the second pilot operated check valve 5b is adjusted.
It is right above the utility model provides a hydraulic system and fan of urgent feathering of fan become oar actuating system and all introduced in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (10)
1. The hydraulic system of the fan emergency feathering comprises an energy accumulator (1), a feathering valve (2), a throttling element (3) and a hydraulic cylinder (4); an outlet oil way of the energy accumulator (1) is communicated with a rodless cavity of the hydraulic cylinder (4), the feathering valve (2) and the throttling element (3) are arranged in the outlet oil way, and the feathering valve (2) is positioned between the energy accumulator (1) and the throttling element (3);
the hydraulic control system is characterized by further comprising a first branch connected with the throttling element (3) in parallel, wherein a first hydraulic control one-way valve (5a) is arranged on the first branch, a control oil port (51a) of the first hydraulic control one-way valve (5a) is connected with an oil path between the feathering valve (2) and the throttling element (3), a first working oil port (52a) of the first hydraulic control one-way valve (5a) is connected between the feathering valve (2) and the throttling element (3), and a second working oil port (53a) of the first hydraulic control one-way valve (5a) is connected with a rodless cavity of the hydraulic cylinder (4);
and when the pressure of the control oil port (51a) of the first hydraulic control check valve (5a) is higher than a first set value, the first working oil port (52a) of the first hydraulic control check valve (5a) is not communicated with the second working oil port (53a) of the first hydraulic control check valve (5a), and when the pressure of the control oil port (51a) of the first hydraulic control check valve (5a) is not higher than the first set value, the first working oil port (52a) of the first hydraulic control check valve (5a) is communicated with the second working oil port (53a) of the first hydraulic control check valve (5a) in a one-way mode.
2. The hydraulic system for emergency feathering of wind turbines as claimed in claim 1, characterized in that a pressure sensor (7) is further connected between the outlet of the accumulator (1) and the feathering valve (2); and a first throttling part (6a) is further arranged on the first branch, and the first throttling part (6a) is positioned between a second working oil port (53a) of the first hydraulic control one-way valve (5a) and a rodless cavity of the hydraulic cylinder (4).
3. Hydraulic system of fan emergency feathering according to claim 2, characterized in that when the pressure of the control oil port (51a) of the first pilot operated check valve (5a) is lower than the first set value, and is higher than a second set value, the conducting aperture between the first working oil port (52a) of the first pilot-controlled check valve (5a) and the second working oil port (53a) of the first pilot-controlled check valve (5a) is increased along with the reduction of the pressure of the control oil port (51a) of the first pilot-controlled check valve (5a), and when the pressure of the control oil port (51a) of the first pilot-controlled check valve (5a) is not higher than the second set value, and the conduction caliber between the first working oil port (52a) of the first hydraulic control one-way valve (5a) and the second working oil port (53a) of the first hydraulic control one-way valve (5a) reaches the maximum value.
4. The hydraulic system for the emergency feathering of the fan as claimed in claim 2, further comprising a second branch connected in parallel with the throttling element (3), wherein a second hydraulic control one-way valve (5b) is arranged on the second branch, a control oil port (51b) of the second hydraulic control one-way valve (5b) is connected with an oil circuit between the feathering valve (2) and the throttling element (3), a first working oil port (52b) of the second hydraulic control one-way valve (5b) is connected between the feathering valve (2) and the throttling element (3), and a second working oil port (53b) of the second hydraulic control one-way valve (5b) is connected with a rodless cavity of the hydraulic cylinder (4);
and when the pressure of the control oil port (51b) of the second hydraulic check valve (5b) is higher than a third set value, the first working oil port (52b) of the second hydraulic check valve (5b) is not communicated with the second working oil port (53b) of the second hydraulic check valve (5b), and when the pressure of the control oil port (51b) of the second hydraulic check valve (5b) is not higher than the third set value, the first working oil port (52b) of the second hydraulic check valve (5b) is communicated with the second working oil port (53b) of the second hydraulic check valve (5b) in a one-way mode.
5. The hydraulic system of wind turbine emergency feathering according to claim 4 wherein the third set point is less than the first set point.
6. The hydraulic system of the fan emergency feathering as claimed in claim 3, further comprising a second branch connected in parallel with the throttling element (3), wherein a second hydraulic control one-way valve (5b) is arranged on the second branch, a control oil port (51b) of the second hydraulic control one-way valve (5b) is connected with an oil circuit between the feathering valve (2) and the throttling element (3), a first working oil port (52b) of the second hydraulic control one-way valve (5b) is connected between the feathering valve (2) and the throttling element (3), and a second working oil port (53b) of the second hydraulic control one-way valve (5b) is connected with a rodless cavity of the hydraulic cylinder (4);
and when the pressure of the control oil port (51b) of the second hydraulic check valve (5b) is higher than a third set value, the first working oil port (52b) of the second hydraulic check valve (5b) is not communicated with the second working oil port (53b) of the second hydraulic check valve (5b), and when the pressure of the control oil port (51b) of the second hydraulic check valve (5b) is not higher than the third set value, the first working oil port (52b) of the second hydraulic check valve (5b) is communicated with the second working oil port (53b) of the second hydraulic check valve (5b) in a one-way mode.
7. The hydraulic system of wind turbine emergency feathering as claimed in claim 6 wherein the third set point is not greater than the second set point.
8. Hydraulic system of fan emergency feathering according to claim 7, characterized in that when the pressure of the control oil port (51b) of the second hydraulic control check valve (5b) is lower than a third set value, and is higher than a fourth set value, the conducting aperture between the first working oil port (52b) of the second hydraulic control one-way valve (5b) and the second working oil port (53b) of the second hydraulic control one-way valve (5b) is increased along with the reduction of the pressure of the control oil port (51b) of the second hydraulic control one-way valve (5b), and when the pressure of the control oil port (51b) of the second hydraulic control one-way valve (5b) is not higher than the fourth set value, and the conduction caliber between the first working oil port (52b) of the second hydraulic control one-way valve (5b) and the second working oil port (53b) of the second hydraulic control one-way valve (5b) reaches the maximum value.
9. The hydraulic system of the fan emergency feathering according to any one of claims 4 to 8, wherein a second throttling member (6b) is further arranged on the second branch, and the second throttling member (6b) is positioned between a second working oil port (53b) of the second hydraulic control one-way valve (5b) and a rodless cavity of the hydraulic cylinder (4).
10. The fan variable-pitch execution system comprises a power device (8) and a hydraulic cylinder (4), wherein one side of a rodless cavity of the hydraulic cylinder (4) is connected with a hub in a fan impeller, one side of a rod cavity of the hydraulic cylinder (4) is connected with a rotating ferrule of a variable-pitch bearing, and the power device (8) is used for controlling the expansion and contraction of a cylinder rod of the hydraulic cylinder (4); characterized in that it further comprises a hydraulic system for emergency feathering of the wind turbine as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921422089.5U CN210290290U (en) | 2019-08-29 | 2019-08-29 | Hydraulic system for emergent feathering of fan and fan variable pitch execution system |
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| CN201921422089.5U CN210290290U (en) | 2019-08-29 | 2019-08-29 | Hydraulic system for emergent feathering of fan and fan variable pitch execution system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111878306A (en) * | 2020-08-04 | 2020-11-03 | 上海电气风电集团股份有限公司 | Hydraulic pitch control method, device and system for wind turbine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111878306A (en) * | 2020-08-04 | 2020-11-03 | 上海电气风电集团股份有限公司 | Hydraulic pitch control method, device and system for wind turbine |
| CN111878306B (en) * | 2020-08-04 | 2021-11-26 | 上海电气风电集团股份有限公司 | Hydraulic pitch control method, device and system for wind turbine |
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Address after: 830026 No. 107, Shanghai Road, Urumqi economic and Technological Development Zone, the Xinjiang Uygur Autonomous Region Patentee after: Jinfeng Technology Co.,Ltd. Address before: 830026 No. 107, Shanghai Road, Urumqi economic and Technological Development Zone, the Xinjiang Uygur Autonomous Region Patentee before: XINJIANG GOLDWIND SCIENCE & TECHNOLOGY Co.,Ltd. |