Yaw system with both active wind alignment and passive wind alignment and generator set

Abstract

The utility model relates to a yaw system with active and passive wind alignment functions and a generator set. The yaw system comprises an oil tank, an active control unit, an execution element and a passive reversing unit. The oil tank is hydraulically connected with the execution element through one of the active control unit and the passive reversing unit; when the active control unit is hydraulically connected with the execution element, the passive reversing unit is disconnected; when the passive reversing unit is hydraulically connected with the execution element, the active control unit is disconnected; corresponding oil ports of the execution element are respectively connected with a liquid path a and a liquid path b; the device is reasonable in design, compact in structure and convenient to use.

Description

Technical Field

[0001] The utility model relates to a yaw system and a wind turbine generator set with both active and passive wind alignment. Background Art

[0002] Traditional wind turbines are equipped with a yaw system, and the nacelle is deflected to face the wind through the yaw system. For example, in CN200910071424.6, "Yaw drive device for a wind turbine generator", it still has a complex drive mechanism, low reliability, and large resistance to yaw drive. Another example is CN115839313A, "Oil control structure, wind turbine yaw system, control method and wind power generating set", although it also provides a solution, but there are also many problems such as large resistance, large heat generation, and complex liquid circuit.

[0003] Although the above-mentioned prior arts all provide solutions for low-resistance yaw, the design ideas of the prior arts are all to regard the wind force as the resistance of yaw, and through the improvement of the system, to overcome the yaw resistance, which is an inertial thinking. The applicant overcomes the existing thinking inertia and creatively discovers and raises the technical problem of how to utilize the wind force, turn its disadvantages into advantages, achieve low-resistance yaw and combine it with active yaw, and at the same time, make the two not interfere with each other and achieve a smooth and seamless transition. Moreover, in order to reduce or eliminate the heat generated by yaw in the prior art, a separate heat dissipation liquid circuit needs to be configured, resulting in a complex liquid circuit.

[0004] Upwind unit: The wind first passes through the rotating wind turbine, and then through the horizontal axis wind turbine generator set of the tower. In this type of unit, the wind turbine is located in front of the tower and rotates against the wind. Characteristics: Since the wind first passes through the wind turbine, the upwind unit requires a certain yaw device to keep the wind turbine always facing the wind to ensure the best wind energy capture efficiency. This design helps to reduce the interference of the tower on the air flow and improve the overall performance of the unit.

[0005] Downwind unit: The wind first passes through the tower, and then through the horizontal axis wind turbine generator set with a rotating wind turbine. In this type of unit, the wind turbine is installed in the downwind position of the tower. Characteristics: The downwind unit can automatically align with the wind direction, so the need for a yaw device is eliminated. However, since part of the air blows towards the wind turbine after passing through the tower, the tower will interfere with the air flow passing through the blades, forming the so-called "tower shadow effect", which may lead to a reduction in the performance of the unit.

[0006] Disadvantages of existing models: Most of them use electric yaw. During the yaw process and when the yaw stops, there are problems such as uneven force on the tooth surface and broken teeth, and there is no buffer, so it is easy to break teeth. For the sliding yaw unit, the friction between the friction plate and the gear ring is large, and it is not suitable to reduce the friction in order to provide appropriate damping. There is a contradiction between the slipping of the brake caliper or caliper and the motor brake. When the brake system slips, it relies on the motor brake force to fix the wind turbine. The driving teeth are unevenly stressed, increasing the risk of broken teeth. Content of the Utility Model

[0007] Generally speaking, the technical problem to be solved by the utility model is to provide a yaw system and a generator set with both active and passive wind alignment.

[0008] To solve the above problems, the technical solution adopted by the utility model is as follows:

[0009] In order to achieve passive yaw and active yaw, a control system with both active and passive wind alignment includes an oil tank, an active control unit, an actuator, and a passive commutation unit;

[0010] The oil tank is respectively hydraulically connected to the actuator through the active control unit and the passive commutation unit selectively;

[0011] When the active control unit is hydraulically connected to the actuator, the passive commutation unit is open;

[0012] When the passive commutation unit is hydraulically connected to the actuator, the active control unit is open;

[0013] The corresponding oil ports of the actuator are respectively connected with hydraulic circuits a and b.

[0014] As a further improvement of the above technical solution:

[0015] In order to supplement the insufficient oil when the motor returns oil, the actuator is hydraulically connected with a make-up oil unit.

[0016] In order to achieve the locked position, a balance unit is hydraulically connected between the active control unit and the actuator;

[0017] In order to prevent the system from overloading, the actuator is connected with a safety unit.

[0018] In order to prevent the liquid from flowing back, the make-up oil unit includes a make-up oil check valve A1 arranged between the oil tank and hydraulic circuit a and / or a make-up oil check valve A2 arranged between the oil tank and hydraulic circuit b;

[0019] In order to achieve the safety of active yaw and at the same time, realize the oil supplement of passive yaw, the hydraulic circuit e where the make-up oil check valve A1 is located and / or the hydraulic circuit f where the make-up oil check valve A2 is located are connected to the oil tank through the hydraulic circuit c;

[0020] When in the passive yaw state, the hydraulic circuit c is a make-up oil circuit and / or a pressure relief circuit;

[0021] When in the active yaw state, the hydraulic circuit c is a pressure relief circuit and / or a make-up oil circuit.

[0022] In order to achieve hydraulic control locking, the balance unit includes a combination valve A between the oil tank and hydraulic circuit a and a combination valve B between the oil tank and hydraulic circuit b; both the combination valve A and the combination valve B include a balance valve and a main circuit check valve arranged in parallel;

[0023] Combined valve A and combined valve B are hydraulically controlled with each other;

[0024] The safety unit includes a safety valve A1 provided between the oil tank and the hydraulic circuit a and / or a safety valve B2 provided between the oil tank and the hydraulic circuit b;

[0025] The hydraulic circuit g where the safety valve A1 is located and / or the hydraulic circuit h where the safety valve B2 is located are connected to the oil tank through the hydraulic circuit c.

[0026] In order to achieve active oil supply, the active control unit includes a control valve group connected between the hydraulic circuit a and the oil tank and an active pump or a two-way pump group;

[0027] In order to drive yaw, the actuator includes a rotary motor assembly for driving the nacelle to yaw.

[0028] In order to achieve two-way passive yaw using wind power, the passive commutation unit includes a hydraulic circuit i connected to the hydraulic circuit a, a main and passive switching valve and a stop valve on the hydraulic circuit i;

[0029] The hydraulic circuit i is respectively connected with a hydraulic circuit n and a hydraulic circuit p;

[0030] The hydraulic circuit p is respectively connected with a hydraulic circuit j and a hydraulic circuit m;

[0031] A check valve B1 is provided on the hydraulic circuit n;

[0032] A check valve C2 is provided on the hydraulic circuit p;

[0033] A speed control valve and a filter are provided on the hydraulic circuit j;

[0034] The hydraulic circuit m and the hydraulic circuit n are jointly connected to the hydraulic circuit k;

[0035] The hydraulic circuit k is connected to the hydraulic circuit b;

[0036] The liquid surface j is respectively connected with a hydraulic circuit q and a cooling liquid circuit;

[0037] The hydraulic circuit q is connected to the hydraulic circuit k;

[0038] A check valve C1 is provided on the hydraulic circuit q;

[0039] A check valve B2 is provided on the hydraulic circuit k;

[0040] In order to control the flow rate, a throttle valve is provided on the cooling liquid circuit;

[0041] The cooling liquid circuit is connected to the oil tank;

[0042] The check valve B1 and the check valve C1 are arranged in the same direction;

[0043] The check valve C2 and the check valve B2 are arranged in the same direction;

[0044] The back pressure at the throttle valve is greater than the back pressure of check valve B1, check valve C1, check valve C2, and / or check valve B2.

[0045] To achieve oil circuit integration, a make-up oil safety valve, a reverse make-up oil check valve, and a make-up oil pump group are connected in parallel between the make-up oil circuit and the fuel tank.

[0046] To expand protection, a wind turbine generator set with both active and passive wind alignment includes a tower body and the above-mentioned yaw system provided on the tower body; the yaw system is connected to a nacelle; and fan blades are provided on the nacelle.

[0047] The present invention creatively integrates heat dissipation and yaw, achieving unexpected effects, greatly simplifying the liquid circuit, and at the same time avoiding pressure loss.

[0048] The specific advantages of the present invention are as follows: 1. It can achieve active and passive yaw modes; when in active yaw, the balance valve of the hydraulic system maintains pressure; the gears are evenly stressed. 2. When in passive downwind, it can automatically align with the wind; reducing the load on the tower barrel. 3. When in passive yaw, it can automatically align with the wind in the downwind direction by wind force and can also operate without power. 4. The hydraulic system has good buffering effect, reducing impact. 5. The buffering effect of the hydraulic system is good, which can absorb and disperse these suddenly generated impact energies, thereby reducing the impact on the system.

[0049] The present invention is reasonable in design, low in cost, durable, safe and reliable, simple to operate, time-saving and labor-saving, cost-saving, compact in structure and convenient to use.

[0050] The present invention has balanced stress and extended service life: the hydraulic motors are connected in parallel with pipelines, avoiding the problem of uneven load that may occur during transmission and extending the service life of the yaw system. Its flexible buffering reduces impact: it can effectively relieve external impacts and vibrations and protect the gearbox from impact damage. Its damping is stable and efficiency is upgraded: the balance valve provides a stable and controllable damping effect during yaw and braking, without relying on friction plates to generate damping. By reducing the friction coefficient, the driving efficiency can be greatly improved. Its quiet operation is environmentally friendly: with the reduction of the friction coefficient, the noise can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a schematic diagram of the passive yaw operation of the present invention.

[0052] Figure 2 is a schematic diagram of the active yaw operation of the present invention.

[0053] Figure 3 is a schematic diagram of valve-controlled hydraulics of the present invention.

[0054] Figure 4 is a schematic diagram of pump-controlled hydraulics of the present invention.

[0055] Figure 5 It is the overall schematic diagram of the module of the present utility model.

[0056] Figure 6 It is the schematic diagram of the active yaw hydraulics of the present utility model.

[0057] Figure 7 It is the schematic diagram of the passive yaw hydraulics of the present utility model.

[0058] Figure 8 It is the schematic diagram of the pump-controlled active hydraulics of the present utility model.

[0059] Wherein: 1. Active control unit; 2. Balance unit; 3. Oil replenishing unit; 4. Safety unit; 5. Passive commutation unit; 6. Actuator; 7. Balance valve; 8. Main circuit check valve; 9. Oil replenishing check valve A1; 10. Oil replenishing check valve A2; 11. Safety valve A1; 12. Safety valve B2; 13. Main and passive switching valve; 14. Stop valve; 15. Speed control valve; 16. Check valve B1; 17. Check valve C1; 18. Check valve B2; 19. Check valve C2; 20. Control valve group; 21. Throttle valve; 22. Heat dissipation liquid circuit; 23. Oil replenishing liquid circuit; 24. Bidirectional pump group; 25. Oil replenishing safety valve; 26. Reverse oil replenishing check valve; 27. Oil replenishing pump group; 28. Fan blade. Specific embodiments

[0060] As Figure 1-8 shown, the control system of the present embodiment with both active and passive wind alignment includes an oil tank, an active control unit 1, an actuator 6 and a passive commutation unit 5;

[0061] The oil tank is respectively hydraulically connected to the A and B ports of the actuator 6 through the active control unit 1 and the passive commutation unit 5 alternatively to realize the oil circuit circulation; and it can be alternatively operated through the control of a stop valve or a commutation valve, etc.

[0062] When the active control unit 1 is hydraulically connected to the actuator 6, the passive commutation unit 5 is open circuit; when the passive commutation unit 5 is hydraulically connected to the actuator 6, the active control unit 1 is open circuit;

[0063] The corresponding oil ports of the actuator 6 are respectively connected with liquid circuits a and b, and the liquid circuits can be connected by pipelines or plates.

[0064] The actuator 6 is hydraulically connected to an oil replenishing unit 3, which can be a liquid circuit or an accumulator, etc.

[0065] A balance unit 2 is hydraulically connected between the active control unit 1 and the actuator 6, which can be a hydraulic lock, etc.;

[0066] The actuator 6 is connected to a safety unit 4, generally a safety valve is used.

[0067] The oil replenishing unit 3 includes an oil replenishing check valve A19 provided between the oil tank and the hydraulic circuit a and / or an oil replenishing check valve A210 provided between the oil tank and the hydraulic circuit b; thereby preventing backflow.

[0068] As a further innovation, the utility model integrates the oil replenishing and safety overflow pipelines, thereby greatly optimizing the pipelines, simplifying the hydraulic system. The hydraulic circuit e where the oil replenishing check valve A19 is located and / or the hydraulic circuit f where the oil replenishing check valve A210 is located are connected to the oil tank through the hydraulic circuit c;

[0069] When in the passive yaw state, the hydraulic circuit c is the oil replenishing hydraulic circuit 23;

[0070] When in the active yaw state, the hydraulic circuit c is the pressure relief circuit.

[0071] The safety unit 4 includes a safety valve A111 provided between the oil tank and the hydraulic circuit a and / or a safety valve B212 provided between the oil tank and the hydraulic circuit b;

[0072] The hydraulic circuit g where the safety valve A111 is located and / or the hydraulic circuit h where the safety valve B212 is located are connected to the oil tank through the hydraulic circuit c.

[0073] As a basic introduction, the balance unit 2 includes a combined valve A between the oil tank and the hydraulic circuit a and a combined valve B between the oil tank and the hydraulic circuit b; both the combined valve A and the combined valve B include a balance valve 7 and a main circuit check valve 8 arranged in parallel;

[0074] The combined valve A and the combined valve B are hydraulically controlled with each other;

[0075] As a support for the upper concept, the active control unit 1 includes a control valve group 20 and an active pump or a two-way pump group 24 connected between the hydraulic circuit a and the oil tank;

[0076] The actuator 6 includes a rotary motor assembly for driving the yaw of the engine room.

[0077] As an introduction to passive yaw, it can be equipped with a wind direction acquisition unit such as a pressure sensor. The passive commutation unit 5 includes a hydraulic circuit i connected to the hydraulic circuit a, a main and passive switching valve 13 and a stop valve 14 on the hydraulic circuit i; the two-position two-way commutation valve is used as the switching valve to achieve rapid commutation, and the stop valve is used to complete the open circuit during active yaw to protect the switching valve. The utility model realizes the unidirectional output of both the hydraulic circuit a and the hydraulic circuit b through the ingenious combination of four check valves and the ingenious connection of the hydraulic circuits.

[0078] As a specific introduction and explanation:

[0079] The hydraulic circuit i is respectively connected to a hydraulic circuit n and a hydraulic circuit p;

[0080] The hydraulic circuit p is respectively connected to a hydraulic circuit j and a hydraulic circuit m;

[0081] A one-way valve B116 is provided on the liquid path n;

[0082] A one-way valve C219 is provided on the liquid path p;

[0083] A speed regulating valve 15 and a filter are provided on the liquid path j to adjust the passive yaw speed;

[0084] The liquid path m and the liquid path n are jointly connected to the liquid path k;

[0085] The liquid path k is connected to the liquid path b;

[0086] The liquid surface j is respectively connected with a liquid path q and a heat dissipation liquid path 22, so as to realize heat release. At the same time, the back pressure of the oil return during yaw is reduced. At the same time, there is a certain back pressure, so as to realize stable low-speed yaw;

[0087] The liquid path q is connected to the liquid path k;

[0088] A one-way valve C117 is provided on the liquid path q;

[0089] A one-way valve B218 is provided on the liquid path k;

[0090] A throttle valve 21 is provided on the heat dissipation liquid path 22, which can be adjusted, such as a damping hole, etc., to realize low-speed yaw;

[0091] The heat dissipation liquid path 22 is connected to the fuel tank, so as to realize oil pressure release, and at the same time, negative pressure pumping is carried out through the oil replenishing liquid path 23 to supplement low-temperature oil;

[0092] The one-way valve B116 and the one-way valve C117 are arranged in the same direction;

[0093] The one-way valve C219 and the one-way valve B218 are arranged in the same direction;

[0094] The one-way valve C219 and the one-way valve C117 are arranged as shown in the figure;

[0095] In order to realize the main oil circulation, at the same time, heat dissipation is realized through a small branch, and the back pressure at the throttle valve 21 is greater than the back pressure of the one-way valve B116, the one-way valve C117, the one-way valve C219 and / or the one-way valve B218.

[0096] An oil replenishing safety valve 25, a reverse oil replenishing one-way valve 26 and an oil replenishing pump group 27 are connected in parallel between the oil replenishing liquid path 23 and the fuel tank.

[0097] Such as Figure 1 、 2 , as a basic introduction, the wind generating set with both active and passive wind alignment in this embodiment includes a tower body and the above-mentioned yaw system arranged on the tower body; the yaw system is connected to the engine room; a fan blade 28 is arranged on the engine room.

[0098] When used for yawing, when it is necessary to yaw against the wind for normal power generation, it is an upwind unit and S1, the active yawing step, is executed; when it is necessary to yaw with the wind for shutdown, it is a downwind unit and S2, the passive yawing step, is executed; automatic wind alignment can be achieved.

[0099] When executing S1, the active yawing step, the main and passive switching valve 13 is closed. As the motor of the actuator 6, ports A and B are not connected.

[0100] S1.1, The steering of the motor is switched through the active control unit 1 to adjust the yaw direction.

[0101] S1.2, When the yawing is in place, the motor position is locked through the balance valve 7. Since the pressures of the liquid path a and the liquid path b are equal, the forces on the motor are balanced.

[0102] S1.3, When the yaw angle changes, the active control unit 1 is used for correction.

[0103] Its hydraulic system has good buffering effect. The safety valve limits the maximum pressure, and there is no situation of brake slippage and damage.

[0104] When executing S2, the passive yawing step, the main and passive switching valve 13 and the stop valve 14 are opened. As the motor of the actuator 6, ports A and B are connected.

[0105] S2.1, Ports A and B of the motor have two-way speed regulation functions and are not affected by the load. (Not limited to the current form)

[0106] S2.2, Since ports A and B of the motor are connected, only the flow rate of the internal leakage of the motor needs to be supplemented through the oil replenishing liquid path 23, which has an automatic oil replenishing function and realizes temperature reduction (an oil replenishing check valve or another motor for oil replenishing can be added). S2.3, Small-flow heat exchange is realized through the heat dissipation liquid path 22 to take away part of the heat in the closed circuit. The fuel tank is equipped with a pre-pressurized air filter, which can make the fuel tank have a certain positive pressure to ensure smooth oil replenishment of the system. The yaw system is closed, thus realizing back pressure.

[0107] In step S2.1, when the oil flows along the hollow arrow in a cycle, that is, from port A of the motor to port B through the outer cycle; first, the oil enters the liquid path i from the liquid path a; then, the oil passes through the check valve B116 on the liquid path p, enters the liquid path j, and then the main path enters port B through the check valve C117 on the liquid path q and then enters the liquid path b, and the auxiliary path returns to the fuel tank through the heat dissipation liquid path 22.

[0108] When the oil flows along the single arrow in a cycle, that is, from port B of the motor to port A through the outer cycle;

[0109] First, the oil enters the liquid path k from the liquid path b; then, the oil passes through the one-way valve B218 on the liquid path k; secondly, it is divided into two paths. The main path enters the liquid path i through the one-way valve C219 of the liquid path n and then enters the liquid path a. The auxiliary path enters the liquid path j through the liquid path m and then returns to the fuel tank through the heat dissipation liquid path 22.

[0110] The present utility model is fully described for a clearer disclosure, and the prior arts will not be enumerated one by one.

[0111] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; as those skilled in the art, it is obvious to combine multiple technical solutions of the present utility model. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model. The technical content not described in detail in the present utility model is well-known technology.

Claims

1. A yaw system with both active and passive wind alignment, characterized in that: It includes an oil tank, an active control unit (1), an actuator (6) and a passive commutation unit (5); The oil tank is hydraulically connected to the actuator (6) selectively through the active control unit (1) and the passive commutation unit (5); When the active control unit (1) is hydraulically connected to the actuator (6), the passive commutation unit (5) is open; When the passive commutation unit (5) is hydraulically connected to the actuator (6), the active control unit (1) is open; The corresponding oil ports of the actuator (6) are respectively connected with hydraulic circuits a and b.

2. The yaw system with both active and passive wind alignment according to claim 1, characterized in that: The actuator (6) is hydraulically connected to a make-up oil unit (3).

3. The yaw system with both active and passive wind alignment according to claim 1, characterized in that: The actuator (6) is connected to a safety unit (4).

4. The yaw system with both active and passive wind alignment according to claim 2, characterized in that: The make-up oil unit (3) includes a make-up check valve A1 (9) provided between the oil tank and the hydraulic circuit a and / or a make-up check valve A2 (10) provided between the oil tank and the hydraulic circuit b; The hydraulic circuit e where the make-up check valve A1 (9) is located and / or the hydraulic circuit f where the make-up check valve A2 (10) is located are connected to the oil tank through the hydraulic circuit c; When in the passive yaw state, the hydraulic circuit c is a make-up oil circuit (23) and / or a pressure relief circuit; When in the active yaw state, the hydraulic circuit c is a pressure relief circuit and / or a make-up oil circuit (23).

5. The yaw system with both active and passive wind alignment according to claim 3, characterized in that: The safety unit (4) includes a safety valve A1 (11) provided between the oil tank and the hydraulic circuit a and / or a safety valve B2 (12) provided between the oil tank and the hydraulic circuit b; The hydraulic circuit g where the safety valve A1 (11) is located and / or the hydraulic circuit h where the safety valve B2 (12) is located are connected to the oil tank through the hydraulic circuit c.

6. The yaw system with both active and passive wind alignment according to claim 1, characterized in that: The active control unit (1) includes a control valve group (20) connected between the hydraulic circuit a and the oil tank and an active pump or a bi-directional pump group (24).

7. The yaw system with both active and passive wind alignment according to claim 1, characterized in that: The passive commutation unit (5) includes a hydraulic circuit i connected to the hydraulic circuit a, a main and passive switching valve (13) and a stop valve (14) on the hydraulic circuit i; The hydraulic circuit i is respectively connected with a hydraulic circuit n and a hydraulic circuit p; The hydraulic circuit p is respectively connected with a hydraulic circuit j and a hydraulic circuit m; A check valve B1 (16) is provided on the hydraulic circuit n; A check valve C2 (19) is provided on the hydraulic circuit p; A speed control valve (15) is provided on the hydraulic circuit j; The hydraulic circuits m and n are jointly connected to the hydraulic circuit k; The hydraulic circuit k is connected to the hydraulic circuit b; The hydraulic circuit j is respectively connected with a hydraulic circuit q and a heat dissipation hydraulic circuit (22); The hydraulic circuit q is connected to the hydraulic circuit k; A check valve C1 (17) is provided on the hydraulic circuit q; A check valve B2 (18) is provided on the hydraulic circuit k; A throttle valve (21) is provided on the heat dissipation hydraulic circuit (22); The heat dissipation hydraulic circuit (22) is connected to the oil tank; The check valve B1 (16) and the check valve C1 (17) are arranged in the same direction; The check valve C2 (19) and the check valve B2 (18) are arranged in the same direction; The back pressure at the throttle valve (21) is greater than the back pressure of the check valve B1 (16), the check valve C1 (17), the check valve C2 (19) and / or the check valve B2 (18).

8. The yaw system with both active and passive wind alignment according to claim 4, characterized in that: A make-up oil safety valve (25), a reverse make-up check valve (26) and a make-up oil pump group (27) are connected in parallel between the make-up oil circuit (23) and the oil tank; The yaw system is a closed type.

9. A wind power generating set with both active and passive wind alignment, characterized in that: It includes a tower body and the yaw system described in claim 1 provided on the tower body; the yaw system is connected to a nacelle; and a fan blade (28) is provided on the nacelle.

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