Hydraulic yaw system and method for wind driven generator and wind driven generator set

Abstract

The invention belongs to the field of wind driven generators, and provides a hydraulic yaw system and method for a wind driven generator and a wind driven generator set. The hydraulic yaw system comprises an outer ring, an inner ring, an upper end cover and a lower end cover; the upper end cover, the inner ring and the lower end cover are fixedly connected, and the outer ring is sleeved outside the inner ring; a plurality of clamping grooves are formed in the outer ring of the inner ring, and blades are installed in the clamping grooves. The outer ring is provided with an oval inner ring, and a radial penetrating oil inlet channel and a radial penetrating oil outlet channel are formed in the side face of the outer ring in the circumferential direction. The oil inlet channel and the oil outlet channel are symmetrical relative to the long axis of the oval inner ring. High-pressure oil entering the hydraulic yaw system drives the blades to rotate, so that the inner ring drives the upper end cover and the lower end cover which are connected with the inner ring to rotate around the axis relative to the outer ring. The hydraulic oil drives the main machine frame to rotate around the axis of the tower barrel to achieve the yaw action of the fan, yaw drive does not need to be matched with a gear ring and a brake to conduct yaw, and the cost of the yaw drive, the gear ring and the brake is saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbines, and in particular relates to a hydraulic yaw system and method for a wind turbine, and a wind turbine generator set. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The yaw device of a wind turbine is also called a wind-facing device. Its function is that when the direction of the wind speed vector changes, the yaw device can automatically adjust the direction of the wind rotor according to the wind direction to ensure that the wind rotor faces the wind direction, thereby maximizing the power generation efficiency. In particular, when the wind direction changes, the yaw device can respond quickly and turn the wind rotor in time. At the same time, the yaw device can control the direction of the wind rotor so that it is not affected by adverse weather conditions such as crosswinds and storms, thereby protecting the wind turbine from damage. Existing yaw devices mainly use a yaw motor to drive a yaw bearing or a yaw gear ring to achieve the yaw of the wind turbine, and use a brake in conjunction with a yaw motor to achieve yaw braking of the wind turbine. The structure is complex and the cost is high. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a hydraulic yaw system, method and wind turbine generator set for a wind turbine. The present invention solves the problem of complex structure and high cost of the wind turbine yaw device in the prior art, and proposes a wind turbine hydraulic yaw device that integrates yaw and braking functions.

[0005] According to some embodiments, a first solution of the present invention provides a hydraulic yaw system for a wind turbine, which adopts the following technical solution:

[0006] A hydraulic yaw system for a wind turbine generator comprises an outer ring, an inner ring, an upper end cover and a lower end cover; the upper end cover, the inner ring and the lower end cover are fixedly connected, and the outer ring is sleeved on the outer side of the inner ring;

[0007] The inner and outer rings are provided with a plurality of slots, and blades are installed in the slots;

[0008] The outer ring has an elliptical inner ring, and a radially penetrating oil inlet channel and a radially penetrating oil outlet channel are circumferentially provided on the side surface of the outer ring; the oil inlet channel and the oil outlet channel are symmetrical with respect to the long axis of the elliptical inner ring.

[0009] Furthermore, the upper end cover is an annular symmetrical stepped structure, and a plurality of upper end cover connection holes evenly distributed in the circumferential direction are provided on the annular inner side of the upper end cover;

[0010] The lower end cover is an annular symmetrical stepped structure, and a plurality of lower end cover connection holes uniformly distributed in the circumferential direction are provided on the annular inner side of the lower end cover.

[0011] Furthermore, the number of the upper end cover connection holes is the same as that of the lower end cover connection holes;

[0012] The upper end cover and the lower end cover are connected through the upper end cover connecting hole and the lower end cover connecting hole, and the inner ring is fixed between the upper end cover and the lower end cover by using a connecting piece.

[0013] Furthermore, the inner ring is an annular symmetrical structure, and a plurality of end cover connection holes evenly distributed in the circumferential direction are provided on the inner side of the annular ring;

[0014] The number of the end cover connection holes is consistent with the number of the upper end cover connection holes and the lower end cover connection holes.

[0015] Furthermore, the upper end surface and the lower end surface of the outer ring are both provided with an annular sealing groove;

[0016] The outer ring is respectively sealed with the upper end cover and the lower end cover through two annular sealing grooves.

[0017] Furthermore, a plurality of main frame connection holes are provided on the annular outer side of the upper end cover;

[0018] The lower end surface of the outer ring is provided with a plurality of tower connection holes.

[0019] Furthermore, the number of the oil inlet channel and the number of the oil outlet channel are both two;

[0020] The two oil inlet channels are symmetrical with respect to the center of the elliptical inner ring;

[0021] The two oil outlet channels are symmetrical with respect to the center of the elliptical inner ring.

[0022] Furthermore, the upper end surface and the lower end surface of the outer ring are both fixedly connected with sliding pads.

[0023] According to some embodiments, a second solution of the present invention provides a hydraulic yaw method for a wind turbine, which adopts the following technical solution:

[0024] A working method of a hydraulic yaw system for a wind turbine utilizes high-pressure oil entering the hydraulic yaw system to drive blades to rotate, so that the inner ring drives the upper and lower end covers connected thereto to rotate around the axis relative to the outer ring.

[0025] According to some embodiments, a third solution of the present invention provides a wind turbine generator set, which adopts the following technical solution:

[0026] A wind turbine generator set comprising a tower and a main frame, and further comprising the hydraulic yaw system for the wind turbine generator as described in the first embodiment, wherein the hydraulic yaw system is fixedly connected to the main frame through the outer side of the upper end cover;

[0027] The hydraulic yaw system is fixedly connected to the tower through the lower end surface of the outer ring.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The hydraulic yaw device of the present invention can connect the tower with the main frame and drive the main frame to rotate around the tower axis through hydraulic oil to realize the yaw action of the wind turbine. There is no need to use a yaw drive in conjunction with a ring gear and a brake for yaw, which saves the cost of yaw drive, ring gear and brake. At the same time, the yaw drive ring gear and brake interface on the main frame can be omitted, simplifying the main frame structure and thus reducing the cost of the main frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0031] Figure 1 This is a top view of the overall structure of a hydraulic yaw system for a wind turbine according to an embodiment of the present invention;

[0032] Figure 2 This is a left side view of the overall structure of a hydraulic yaw system for a wind turbine according to an embodiment of the present invention;

[0033] Figure 3 yes Figure 1 Middle AA section;

[0034] Figure 4 yes Figure 1 Middle BB cross-section;

[0035] Figure 5 This is a schematic diagram of the upper end cover structure in an embodiment of the present invention;

[0036] Figure 6 yes Figure 5 mid-CC cross-section;

[0037] Figure 7 This is a schematic diagram of the lower end cover structure in an embodiment of the present invention;

[0038] Figure 8 yes Figure 7 Middle DD section;

[0039] Figure 9 This is a schematic diagram of the inner ring structure in an embodiment of the present invention;

[0040] Figure 10 2. This is a top view of the upper end surface of the outer ring in an embodiment of the present invention;

[0041] Figure 11 This is a bottom view of the lower end of the outer ring in an embodiment of the present invention;

[0042] Figure 12 is a left side view of the outer ring in an embodiment of the present invention;

[0043] Figure 13 Schematic diagram of the internal structure of an embodiment of the present invention;

[0044] Figure 14 Schematic diagram of the hydraulic oil circuit in an embodiment of the present invention;

[0045] Figure 15 This is a safety diagram of a hydraulic yaw system for a wind turbine according to an embodiment of the present invention;

[0046] In the figure: 1-upper end cover, 2-lower end cover, 3-inner ring, 4-outer ring, 5-sliding liner, 6-blade, 601-blade No. 1, 602-blade No. 2, 603-blade No. 3, 604-blade No. 4, 605-blade No. 5, 606-blade No. 6, 607-blade No. 7, 608-blade No. 8, 609-blade No. 9, 610-blade No. 10, 611-blade No. 11, 612-blade No. 12, 7-oil inlet, 8-oil outlet, 9-rubber block, 10-end cover connecting bolt, 11-sliding liner connecting bolt, 12-washer;

[0047] a-main frame connecting hole, b-upper end cover connecting hole, c-lower end cover connecting hole, d-end cover connecting hole, e-slot, f-annular sealing groove, g-sliding gasket connecting bolt through hole, h-tower connecting hole, j-oil inlet channel, k-oil outlet channel; E-main frame, F-tower. DETAILED DESCRIPTION

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0049] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0051] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0052] Example 1

[0053] This embodiment provides a hydraulic yaw system for a wind turbine, comprising an outer ring 4, an inner ring 3, an upper end cover 1, and a lower end cover 2; the upper end cover 1, the inner ring 3, and the lower end cover 2 are fixedly connected, and the outer ring 4 is sleeved on the outer side of the inner ring 3;

[0054] The outer ring of the inner ring 3 is provided with a plurality of slots e, and blades 6 are installed in the slots e;

[0055] The outer ring 4 has an elliptical inner ring, and a radially penetrating oil inlet channel and a radially penetrating oil outlet channel are circumferentially provided on the outer ring side surface; the oil inlet channel and the oil outlet channel are symmetrical with respect to the long axis of the elliptical inner ring.

[0056] like Figure 1 、 Figure 2 、 Figure 3 as well as Figure 4 As shown, the hydraulic yaw system as a whole has a ring-shaped symmetrical structure, which consists of an upper end cover 1, a lower end cover 2, an inner ring 3, an outer ring 4, a sliding pad 5, a blade 6, an oil inlet 7, an oil outlet 8, a rubber block 9, an end cover connecting bolt 10, a sliding pad connecting bolt 11, and a washer 12.

[0057] like Figure 5 and Figure 6 As shown, the upper end cover 1 is an annular symmetrical stepped structure. The annular inner side of the upper end cover 1 is provided with 8 upper end cover connection holes b evenly distributed circumferentially, and the annular outer side of the upper end cover 1 is provided with 20 main frame connection holes a. The upper end cover 1 is connected to the main frame E through a connecting piece. It can be understood that the number of a and b can be selected as needed, and the connecting piece includes but is not limited to bolts, rivets, etc.

[0058] like Figure 7 and Figure 8 As shown, the lower end cover 2 is an annular symmetrical stepped structure, and the annular inner side of the lower end cover 2 is provided with 8 lower end cover connecting holes c evenly distributed in the circumferential direction.

[0059] like Figure 9 As shown, the inner ring 3 is an annular symmetrical structure, provided with 8 end cover connecting bolt holes d and 12 slots e that are evenly distributed around the circumference.

[0060] By aligning the upper end cover connecting hole b, the end cover connecting hole d and the lower end cover connecting hole c, the upper end cover 1, the inner ring 3 and the lower end cover 2 are connected as a whole using the end cover connecting bolts 10 and the washers 12. It can be understood that the number of b, d, and c can be selected as needed, but the number of the three remains consistent.

[0061] like Figure 10 、 Figure 11 as well as Figure 12As shown, the outer ring 4 is an annular symmetrical structure, and its inner ring is elliptical. The upper end face and the lower end face are provided with an annular sealing groove f, which cooperates with the upper end cover 1 and the lower end cover 2 for sealing respectively.

[0062] Two radially extending oil inlet channels j and two radially extending oil outlet channels k are circumferentially arranged on the side of outer ring 4, connecting to oil inlet hole 7 and oil outlet hole 8. The two inlet channels are symmetrical about the center of the elliptical inner ring, while the two outlet channels are symmetrical about the center of the elliptical inner ring. The oil inlet is connected to the oil outlet of the hydraulic pump station via a high-pressure pipeline, and the oil outlet is connected to the oil return hole of the hydraulic pump station via a high-pressure pipeline.

[0063] The upper and lower end faces of the outer ring 4 are provided with 8 sliding pad connection bolt through holes g, and the lower end face is provided with 20 circumferentially evenly distributed tower connection holes h, which are connected to the tower F by bolts. It can be understood that the number of g can be selected as needed.

[0064] The sliding pad 5 is an annular, symmetrical structure with eight sliding pad connection bolt holes evenly distributed around the circumference. It is secured to the upper and lower end surfaces of the outer ring 4 via sliding pad connection bolts 11 and washers 12. It is understood that the connection methods between the sliding pad and the outer ring include, but are not limited to, bolt connection and pin connection.

[0065] One side of blade 6 is mounted in slot e of inner ring 3, with rubber block 9 installed between slot e and blade 6. The elastic action of rubber block 9 keeps the other side of blade 6 in constant contact with outer ring 4. This ensures that when the inner ring drives the blades to rotate, the cavity formed by two adjacent blades and the outer ring is sealed and pressure is not released. Oil will not flow in or out until it reaches the oil inlet or outlet. The shape of slot e matches that of blade 6.

[0066] It can be understood that the hydraulic yaw system for the wind turbine also includes a yaw controller, which communicates with the main control center of the wind turbine generator set. When the main control center monitors the change in wind direction, it will send a yaw signal to the yaw controller, and use the adjustment of the rotation direction of the yaw system to automatically adjust the direction of the wind wheel to ensure that the wind wheel faces the wind direction; the communication method between the main control center and the yaw controller and the monitoring of wind direction by the main control center are conventional technologies and will not be repeated here.

[0067] Example 2

[0068] This embodiment provides a working method of a hydraulic yaw system for a wind turbine, utilizing high-pressure oil entering the hydraulic yaw system to drive the blades to rotate, so that the inner ring drives the upper and lower end covers connected thereto to rotate around the axis relative to the outer ring.

[0069] High-pressure oil enters the hydraulic yaw device through the oil inlet, driving the blades, inner ring, upper end cover and lower end cover to rotate around the axis relative to the outer ring, and then is discharged from the oil outlet. Since the upper end cover and outer ring are respectively connected to the main frame and tower, the yaw of the entire wind turbine can be achieved. At the same time, the hydraulic yaw device can realize the yaw braking function by controlling the opening and closing of the oil inlet and outlet holes.

[0070] like Figure 13 and Figure 14 As shown, the hydraulic yaw system operates as follows: high-pressure oil enters the hydraulic yaw device through oil inlet 7 and is subsequently discharged through oil outlet 8. At this point, blades 606 and 12 are located on both sides of the pressure chamber, acting upon them by the pressure oil and generating no torque. Blades 1 and 11 are affected by pressure oil on one side, while the other sides, located in the oil outlet chamber, are affected by low-pressure oil. Because the inner ring of outer ring 4 is elliptical, the extension of blade 1 601 is greater than that of blade 11 611. Consequently, the force-bearing area of blade 1 601 is greater than that of blade 11 611, resulting in a counterclockwise rotational torque generated by inner ring 3.

[0071] At the same time, one side of blade 5 605 and blade 7 607 is subjected to pressurized oil, while the other side, located in the oil outlet chamber, is subjected to low-pressure oil. Because the inner ring of outer ring 4 is elliptical, the extension of blade 7 607 is greater than that of blade 5 605. Consequently, the force-bearing area of blade 7 607 is greater than that of blade 5 605, thus generating a counterclockwise rotational torque on inner ring 3. This in turn drives the connected upper and lower end caps 1 and 2 to rotate counterclockwise about the axis relative to outer ring 4.

[0072] Similarly, if high-pressure oil enters the hydraulic yaw mechanism through oil outlet 8 and exits through oil inlet 7, blades 2 and 8 are located on both sides of the pressure chamber, acting on both sides with the pressure oil, generating no torque. Blades 1 and 3 are affected by the pressure oil on one side, while the other sides, located in the oil outlet chamber, are affected by low-pressure oil. Because the inner ring of outer ring 4 is elliptical, the extension of blade 1 601 is greater than that of blade 3 603. Consequently, the force-bearing area of blade 1 601 is greater than that of blade 3 603, generating a clockwise rotational torque on inner ring 3.

[0073] At the same time, one side of blade 7 607 and blade 9 609 is subjected to pressurized oil, while the other side, located in the oil outlet chamber, is subjected to low-pressure oil. Because the inner ring of outer ring 4 is elliptical, the extension of blade 7 607 is greater than that of blade 9 609. Consequently, the force-bearing area of blade 7 607 is greater than that of blade 9 609, generating a clockwise rotational torque in inner ring 3. This allows inner ring 3 to drive the connected upper and lower end caps 1 and 2 to rotate clockwise relative to the outer ring 4 about their axis.

[0074] The entire wind turbine can yaw because the upper end cover 1 and outer ring 4 are connected to the main frame E and tower F, respectively. When the hydraulic yaw device's oil inlet 7 and oil outlet 8 are closed simultaneously, the hydraulic oil cannot be discharged, and all blades are under pressure and cannot rotate, thus achieving the yaw braking function.

[0075] Example 3

[0076] like Figure 14 As shown, this embodiment provides a wind turbine generator set, including a tower F and a main frame E, and also includes a hydraulic yaw system for a wind turbine generator as described in Example 1, wherein the hydraulic yaw system is fixedly connected to the main frame through the outer side of the upper end cover;

[0077] The hydraulic yaw system is fixedly connected to the tower through the lower end surface of the outer ring.

[0078] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A hydraulic yaw system for a wind turbine, characterized in that: It includes an outer ring, an inner ring, an upper end cover and a lower end cover; the upper end cover, the inner ring and the lower end cover are fixedly connected, and the outer ring is sleeved on the outer side of the inner ring; The inner and outer rings are provided with a plurality of slots, and blades are installed in the slots; The outer ring has an elliptical inner ring, and a radially penetrating oil inlet channel and a radially penetrating oil outlet channel are circumferentially provided on the side surface of the outer ring; the oil inlet channel and the oil outlet channel are symmetrical with respect to the long axis of the elliptical inner ring.

2. A hydraulic yaw system for a wind turbine according to claim 1, characterized in that: The upper end cover is an annular symmetrical stepped structure, and a plurality of upper end cover connection holes evenly distributed in the circumference are provided on the inner side of the annular structure of the upper end cover; The lower end cover is an annular symmetrical stepped structure, and a plurality of lower end cover connection holes uniformly distributed in the circumferential direction are provided on the annular inner side of the lower end cover.

3. A hydraulic yaw system for a wind turbine according to claim 2, characterized in that: The number of the upper end cover connection holes is the same as that of the lower end cover connection holes; The upper end cover and the lower end cover are connected through the upper end cover connecting hole and the lower end cover connecting hole, and the inner ring is fixed between the upper end cover and the lower end cover by using a connecting piece.

4. A hydraulic yaw system for a wind turbine according to claim 3, characterized in that: The inner ring is an annular symmetrical structure, and a plurality of end cover connection holes evenly distributed in the circumferential direction are provided on the inner side of the annular ring; The number of the end cover connection holes is consistent with the number of the upper end cover connection holes and the lower end cover connection holes.

5. The hydraulic yaw system for a wind turbine according to claim 1, wherein: The upper end surface and the lower end surface of the outer ring are both provided with an annular sealing groove; The outer ring is respectively sealed with the upper end cover and the lower end cover through two annular sealing grooves.

6. A hydraulic yaw system for a wind turbine according to claim 5, characterized in that: The annular outer side of the upper end cover is provided with a plurality of main frame connection holes; The lower end surface of the outer ring is provided with a plurality of tower connection holes.

7. The hydraulic yaw system for a wind turbine according to claim 1, wherein: There are two oil inlet channels and two oil outlet channels; The two oil inlet channels are symmetrical with respect to the center of the elliptical inner ring; The two oil outlet channels are symmetrical with respect to the center of the elliptical inner ring.

8. The hydraulic yaw system for a wind turbine according to claim 1, wherein: The upper end surface and the lower end surface of the outer ring are both fixedly connected with sliding pads.

9. A method for operating a hydraulic yaw system for a wind turbine according to any one of claims 1 to 8, characterized in that: The high-pressure oil entering the hydraulic yaw system drives the blades to rotate, so that the inner ring drives the upper end cover and lower end cover connected to it to rotate around the axis relative to the outer ring.

10. A wind turbine generator set, comprising a tower and a main frame, characterized in that: It also includes a hydraulic yaw system for a wind turbine according to any one of claims 1 to 8, wherein the hydraulic yaw system is fixedly connected to the main frame through the outer side of the upper end cover; The hydraulic yaw system is fixedly connected to the tower through the lower end surface of the outer ring.

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