Automatic speed change device applied to wind driven generator

Abstract

The utility model discloses an automatic speed change device applied to a wind driven generator, which relates to the field of wind power generation devices and comprises a main shaft, an auxiliary shaft, a third shaft, a fourth shaft and a fifth shaft. One end of the main shaft is connected with the impeller, and the other end is meshed with the auxiliary shaft; the auxiliary shaft is a telescopic shaft and can axially move according to the rotating speed change of the main shaft, and the moving end of the auxiliary shaft is connected with the third shaft; the fourth shaft and the fifth shaft are connected in a meshed mode through a plurality of gear sets, and the transmission ratio of the gear set closer to the auxiliary shaft is larger. The third shaft is connected with a fourth shaft, and a gear set switching device matched with the third shaft is arranged on the fourth shaft; the output end of the fifth shaft is used for being connected with a generator set. According to the utility model, when the speed of the impeller changes suddenly, the auxiliary shaft moves axially, so that the gear set is switched, the transmission ratio between the fourth shaft and the fifth shaft is changed, and the shaft rotating speed curve of the generator set end is smoother.

Description

Technical Field

[0001] The utility model relates to the field of wind power generation devices, in particular to an automatic speed change device applied to a wind power generator. Background Art

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

[0003] Existing wind turbine generator sets generally use a fixed speed ratio speed change device to connect the impeller shaft and the generator set. This design can ensure stable operation of the generator set under different wind speeds.

[0004] However, the existing speed change device needs to be adjusted by external force when facing a sudden change in the impeller speed. It does not have an automatic adjustment function and cannot ensure the stability of the kinetic energy input of the generator set. This means that manual intervention is required to adjust the operating speed of the generator set, thus affecting its operating efficiency and stability. Therefore, how to achieve automatic adjustment of wind turbines and improve their ability to adapt to different wind speed environments has become one of the current research focuses. Utility Model Content

[0005] The purpose of the utility model is to provide an automatic speed change device for a wind turbine in response to the problems existing in the prior art, which adjusts the output speed by generating different torques at the input and output ends to cope with sudden changes in the impeller speed, thereby improving the stability of the kinetic energy input of the generator set and solving the above-mentioned problems.

[0006] The technical solution of the utility model is as follows:

[0007] An automatic speed change device applied to a wind turbine generator comprises: a main shaft, a secondary shaft, a third shaft, a fourth shaft and a fifth shaft;

[0008] One end of the main shaft is used to connect the impeller as power input, and the other end is engaged with the secondary shaft;

[0009] The secondary shaft is a telescopic shaft, which can make the spring absorb mechanical energy or release elastic potential energy according to the rotation speed change of the main shaft, compress or stretch the movable end of the secondary shaft to move axially, and the movable end of the secondary shaft is connected to the third shaft;

[0010] The fourth shaft and the fifth shaft are meshed and connected via multiple gear sets, and the gear set closer to the secondary shaft has a larger transmission ratio;

[0011] The third shaft is connected to the fourth shaft, and a gear set switching device cooperating with the third shaft is provided on the fourth shaft. The gear set for power transmission between the fourth shaft and the fifth shaft is switched through axial movement of the secondary shaft; the output end of the fifth shaft is used to connect the generator set;

[0012] When the impeller speed changes suddenly, the countershaft moves axially, thereby switching the gear set and changing the transmission ratio between the fourth shaft and the fifth shaft to make the shaft speed curve at the generator set end smoother.

[0013] Furthermore, the main shaft is a helical gear cylindrical shaft, and the secondary shaft is connected to the main shaft via a helical gear.

[0014] Furthermore, the bevel gear is located in the middle of the secondary shaft, a telescopic sleeve is provided at one end of the secondary shaft, and the other end of the secondary shaft is connected to the third shaft; when the speed of the main shaft changes suddenly, the bevel gear will move axially under the toothing action of the bevel gear and the bevel gear barrel shaft, thereby driving the telescopic sleeve to retract and retract, and finally driving the secondary shaft to move axially.

[0015] Furthermore, a spring is sleeved on the telescopic sleeve, and when the axial force applied to the telescopic sleeve is inconsistent with the elastic force of the spring, the telescopic sleeve is telescoped.

[0016] Furthermore, the end of the secondary shaft away from the telescopic sleeve is a movable end, and a raised limit block is arranged on the surface of the movable end; the interior of the third shaft is hollow, and is provided with a limit groove cooperating with the limit block. Through the cooperation between the limit block and the limit groove, the secondary shaft can drive the third shaft to rotate and move axially inside the third shaft at the same time.

[0017] Furthermore, a push rod is connected to the movable end; the third shaft is a hollow shaft cylinder of the brake shoe, and multiple groups of centrally symmetrical brake shoes and paddles are distributed on the outside of the shaft. When the push rod moves axially inside the third shaft, the brake shoe can be supported or lowered by the paddle in sequence according to the arrangement position, and the surface of the brake shoe is a friction-resistant material.

[0018] Furthermore, the fourth shaft is a drum brake shaft, which is connected by multiple sets of drum brake discs through bearings and is installed concentrically with the third shaft; the drum brake discs correspond to the brake shoes one by one; the inside of the drum brake disc is made of friction-resistant material, and a driving gear is installed on the outside; when the brake shoe is supported and contacts the corresponding drum brake disc, the corresponding driving gear moves at the same speed as the third shaft.

[0019] Furthermore, the fifth shaft is a ratchet shaft, on which are mounted a plurality of ratchets, which rotate in one direction; a driven gear meshing with a corresponding driving gear is mounted on the outside of the ratchet; among the plurality of ratchet gears, the one with the fastest rotation speed drives the ratchet shaft to rotate, outputs kinetic energy, and thereby drives the generator set to rotate.

[0020] Furthermore, the ratchet comprises: a ratchet bearing, a jack tooth and a jack toothed disc; the ratchet bearing and the jack toothed disc are installed inside the jack toothed disc and are installed coaxially with the ratchet shaft.

[0021] Furthermore, the driven gear is mounted on a jack toothed disc, and the jack teeth are fixedly connected to the ratchet shaft. The jack toothed disc with the fastest rotation speed drives the jack teeth to rotate, thereby driving the ratchet shaft to rotate.

[0022] Compared with the existing technology, the beneficial effects of the utility model are:

[0023] An automatic speed change device applied to a wind turbine generator can cause the secondary shaft to move axially when the impeller speed suddenly changes, thereby switching the gear set and changing the transmission ratio between the fourth shaft and the fifth shaft, so as to make the shaft speed curve at the generator set end smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a schematic diagram of the structure of an automatic speed change device applied to a wind turbine;

[0025] Figure 2 The main axis structure diagram;

[0026] Figure 3 Schematic diagram of the secondary shaft structure;

[0027] Figure 4 It is a schematic diagram of the third axis structure;

[0028] Figure 5 It is the third axis section view;

[0029] Figure 6 is a schematic diagram of the fourth axis structure;

[0030] Figure 7 It is the fourth axis section view;

[0031] Figure 8 This is a schematic diagram of the fifth axis structure;

[0032] Fig. 9 Schematic diagram of ratchet structure;

[0033] Fig.10 Schematic diagram of ratchet structure.

[0034] Figure markings: 1-main shaft, 2-secondary shaft, 3-third shaft, 4-fourth shaft, 5-fifth shaft, 6-bevel gear, 7-telescopic sleeve, 8-spring, 9-moving end, 10-limiting block, 11-limiting groove, 12-push rod, 13-brake shoe, 14-paddle, 15-drum brake disc, 16-driving gear, 17-ratchet, 18-driven gear, 19-ratchet bearing, 20-jack teeth, 21-jack sprocket disc. DETAILED DESCRIPTION

[0035] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0037] Embodiment 1

[0038] See also Figure 1-10 , an automatic speed change device for a wind turbine generator, comprising: a main shaft 1, a secondary shaft 2, a third shaft 3, a fourth shaft 4 and a fifth shaft 5; it should also be noted that, if Figure 1 As shown, the main shaft 1, the secondary shaft 2, the third shaft 3, the fourth shaft 4 and the fifth shaft 5 are all mounted on the mounting platform through bearings;

[0039] One end of the main shaft 1 is used to connect the impeller as power input, and the other end is meshed with the secondary shaft 2; Figure 1 In the figure, the right end of the main shaft 1 is used to connect the impeller;

[0040] The secondary shaft 2 is a telescopic shaft, which can move axially according to the rotation speed change of the main shaft 1, and the movable end 9 of the secondary shaft 2 is connected to the third shaft 3;

[0041] The fourth shaft 4 and the fifth shaft 5 are meshed and connected via multiple gear sets, and the gear set closer to the secondary shaft 2 has a larger transmission ratio; Figure 1 As shown, the transmission ratio increases from left to right;

[0042] The third shaft 3 is connected to the fourth shaft 4. The fourth shaft 4 is provided with a gear set switching device that cooperates with the third shaft 3. The gear set for power transmission between the fourth shaft 4 and the fifth shaft 5 is switched through the axial movement of the secondary shaft 2. The output end of the fifth shaft 5 is used to connect the generator set.

[0043] When the impeller speed changes suddenly, the secondary shaft 2 moves axially, thereby switching the gear set and changing the transmission ratio between the fourth shaft 4 and the fifth shaft 5, so as to make the shaft speed curve at the generator set end smoother.

[0044] In this embodiment, specifically, the main shaft 1 is a cylindrical shaft of a helical gear 6 , and the secondary shaft 2 is connected to the main shaft 1 through the helical gear 6 .

[0045] In this embodiment, specifically, the bevel gear 6 is located in the middle of the secondary shaft 2, a telescopic sleeve 7 is provided at one end of the secondary shaft 2, and the other end of the secondary shaft 2 is connected to the third shaft 3; when the speed of the main shaft 1 suddenly changes, under the toothing action of the bevel gear 6 and the cylinder shaft of the bevel gear 6, the bevel gear 6 will move axially, thereby driving the telescopic sleeve 7 to retract and retract, and finally driving the secondary shaft 2 to move axially.

[0046] In this embodiment, specifically, a spring 8 is sleeved on the telescopic sleeve 7. When the axial force applied to the telescopic sleeve 7 is inconsistent with the elastic force of the spring 8, the telescopic sleeve 7 is telescoped.

[0047] For example, when the wind speed suddenly increases, the rotation speed of the impeller will suddenly increase. At this time, because the axial force on the bevel gear 6 is much greater than the elastic force of the spring 8, the telescopic sleeve 7 is driven to contract, thereby moving the secondary shaft 2 to the right; vice versa, which will not be repeated here.

[0048] In this embodiment, specifically, the end of the secondary shaft 2 away from the telescopic sleeve 7 is the moving end 9 (i.e. Figure 3 The left end in the figure), a protruding stopper 10 is provided on the surface of the movable end 9; the third shaft 3 is hollow inside and is provided with a stopper groove 11 that cooperates with the stopper block 10. Through the cooperation between the stopper block 10 and the stopper groove 11, the secondary shaft 2 can drive the third shaft 3 to rotate and move axially inside the third shaft 3;

[0049] Preferably, if Figure 3 As shown, a circle of raised limit blocks 10 are arranged on the surface of the moving end 9, and a circle of corresponding limit grooves 11 are arranged inside the third shaft 3, so as to ensure the stability of power transmission.

[0050] In the present embodiment, specifically, a push rod 12 is further connected to the movable end 9; the third shaft 3 is a hollow shaft cylinder of a brake shoe, and a plurality of sets of centrally symmetrical brake shoes 13 and paddles 14 are distributed on the outer side of the shaft. When the push rod 12 moves axially inside the third shaft 3, the brake shoe 13 can be supported or lowered in sequence by the paddles 14 according to the arrangement position, and the surface of the brake shoe 13 is made of friction-resistant material; preferably, the top end of the push rod 12 is chamfered to facilitate pushing the paddle 14; in the present embodiment, there are a total of 5 sets of brake shoes 13 and paddles 14; it should be noted that the paddle 14 has a built-in torsion spring to provide a reset force.

[0051] In this embodiment, specifically, the fourth shaft 4 is a drum brake shaft, connected by multiple sets of drum brake discs 15 through bearings, and installed concentrically with the third shaft 3; the drum brake discs 15 correspond to the brake shoes 13 one by one; the inside of the drum brake discs 15 is a friction-resistant material, and a driving gear 16 is installed on the outside; when the brake shoe 13 is supported and contacts the corresponding drum brake disc 15, the corresponding driving gear 16 moves with the third shaft 3 at the same speed; preferably, there are 5 drum brake discs 15 in total;

[0052] For example, when the secondary shaft 2 moves to the right, the paddle 14 on the left loses the support of the push rod 12 and is reset under the action of the torsion spring, thereby separating the corresponding brake shoe 13 from the drum brake disc 15, that is, stopping driving the corresponding driving gear 16 to rotate.

[0053] In the present embodiment, specifically, the fifth shaft 5 is a ratchet shaft, on which are mounted a plurality of ratchets 17, which rotate unidirectionally; a driven gear 18 meshing with the corresponding driving gear 16 is mounted on the outside of the ratchet 17; among the plurality of ratchet wheels 17, the one with the fastest rotation speed drives the ratchet shaft to rotate, outputs kinetic energy, and thereby drives the generator set to rotate; in the present embodiment, there are a total of 5 ratchets 17; it should be noted that because the transmission ratio increases from left to right, when the wind speed suddenly increases, the secondary shaft 2 moves to the right, thereby gradually increasing the transmission ratio, and gradually increasing the rotation speed of the fifth shaft 5, making the power transmission more stable and smooth.

[0054] In this embodiment, specifically, the ratchet 17 includes: a ratchet bearing 19, a jack tooth 20 and a jack toothed disc 21; the ratchet bearing 19 and the jack tooth 20 are installed inside the jack toothed disc 21, and are installed coaxially with the ratchet shaft.

[0055] In this embodiment, specifically, the driven gear 18 is mounted on the jack toothed disc 21, and the jack toothed disc 21 is fixedly connected to the ratchet shaft. The jack toothed disc 21 with the fastest rotation speed drives the jack toothed disc 20 to rotate, thereby driving the ratchet shaft to rotate;

[0056] The principle is: assuming that the five driving gears 16 on the fourth shaft 4 are all driven to rotate by the third shaft 3, because the transmission ratio increases from left to right, the leftmost driven gear 18 has the fastest rotation speed, so the corresponding jack toothed disc 21 presses against the jack tooth 20, thereby driving the fifth shaft 5 to rotate; other situations are similar and will not be elaborated here.

[0057] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

[0058] This background technology section is provided to generally present the context of the present invention, and the work of the currently named inventors, the work to the extent described in this background technology section, and aspects of this section that did not constitute prior art at the time of application are neither explicitly nor implicitly admitted to be prior art of the present invention.

Claims

1. An automatic speed change device for a wind turbine, characterized in that: include: A primary axis (1), a secondary axis (2), a third axis (3), a fourth axis (4) and a fifth axis (5); One end of the main shaft (1) is used to connect to the impeller as power input, and the other end is meshed with the secondary shaft (2); The secondary shaft (2) is a telescopic shaft, which can move axially according to the rotation speed change of the main shaft (1), and the movable end (9) of the secondary shaft (2) is connected to the third shaft (3); The fourth shaft (4) and the fifth shaft (5) are meshedly connected via a plurality of gear sets, wherein the gear set closer to the secondary shaft (2) has a greater transmission ratio; The third shaft (3) is connected to the fourth shaft (4); the fourth shaft (4) is provided with a gear set switching device that cooperates with the third shaft (3); the gear set for power transmission between the fourth shaft (4) and the fifth shaft (5) is switched through the axial movement of the countershaft (2); the output end of the fifth shaft (5) is used to connect to a generator set; When the impeller speed suddenly changes, the secondary shaft (2) moves axially, thereby switching the gear set and changing the transmission ratio between the fourth shaft (4) and the fifth shaft (5), so that the shaft speed curve at the generator set end is smoother.

2. The automatic speed change device for a wind turbine generator according to claim 1, characterized in that: The main shaft (1) is a cylindrical shaft of a helical gear (6), and the secondary shaft (2) is connected to the main shaft (1) via the helical gear (6).

3. The automatic speed change device for a wind turbine generator according to claim 2, characterized in that: The bevel gear (6) is located in the middle of the secondary shaft (2); a telescopic sleeve (7) is provided at one end of the secondary shaft (2); and the other end of the secondary shaft (2) is connected to the third shaft (3); when the rotation speed of the main shaft (1) suddenly changes, the bevel gear (6) will move axially under the toothing action of the bevel gear (6) and the cylindrical shaft of the bevel gear (6), thereby driving the telescopic sleeve (7) to extend and retract, and finally driving the secondary shaft (2) to move axially.

4. The automatic speed change device for a wind turbine generator according to claim 3, characterized in that: A spring (8) is sleeved on the telescopic sleeve (7). When the axial force applied to the telescopic sleeve (7) is inconsistent with the elastic force of the spring (8), the telescopic sleeve (7) telescopes.

5. The automatic speed change device for a wind turbine generator according to claim 4, characterized in that: The end of the secondary shaft (2) away from the telescopic sleeve (7) is a movable end (9), and a protruding limit block (10) is provided on the surface of the movable end (9); the third shaft (3) is hollow inside and is provided with a limit groove (11) that cooperates with the limit block (10); through the cooperation between the limit block (10) and the limit groove (11), the secondary shaft (2) can drive the third shaft (3) to rotate and simultaneously move axially inside the third shaft (3).

6. The automatic speed change device for a wind turbine generator according to claim 5, characterized in that: The movable end (9) is also connected to a push rod (12); the third shaft (3) is a hollow shaft cylinder of a brake shoe, and a plurality of groups of centrally symmetrical brake shoes (13) and paddles (14) are distributed outside the shaft; when the push rod (12) moves axially inside the third shaft (3), the brake shoe (13) can be supported or lowered in sequence by the paddles (14) according to the arrangement position; and the surface of the brake shoe (13) is made of friction-resistant material.

7. The automatic speed change device for a wind turbine generator according to claim 6, characterized in that: The fourth shaft (4) is a drum brake shaft, connected by a plurality of drum brake discs (15) through bearings, and is installed concentrically with the third shaft (3); the drum brake discs (15) correspond to the brake shoes (13) one by one; the inside of the drum brake discs (15) is made of friction-resistant material, and a driving gear (16) is installed on the outside; when the brake shoes (13) are supported and contact the corresponding drum brake discs (15), the corresponding driving gear (16) and the third shaft (3) move at the same speed.

8. The automatic speed change device for a wind turbine generator according to claim 7, characterized in that: The fifth shaft (5) is a ratchet shaft, and a plurality of ratchet wheels (17) are mounted on the ratchet shaft, and the ratchet wheels (17) rotate in one direction; a driven gear (18) meshing with a corresponding driving gear (16) is mounted outside the ratchet wheel (17); among the plurality of ratchet wheels (17), the one with the fastest rotation speed drives the ratchet shaft to rotate, outputs kinetic energy, and thus drives the generator set to rotate.

9. The automatic speed change device for a wind turbine generator according to claim 8, characterized in that: The ratchet (17) comprises: a ratchet bearing (19), a jack tooth (20) and a jack toothed disc (21); the ratchet bearing (19) and the jack tooth (20) are installed inside the jack toothed disc (21) and are installed coaxially with the ratchet shaft.

10. The automatic speed change device for a wind turbine generator according to claim 9, characterized in that: The driven gear (18) is mounted on a jack toothed disc (21), and the jack teeth (20) are fixedly connected to the ratchet shaft. The jack toothed disc (21) with the fastest rotation speed drives the jack teeth (20) to rotate, thereby driving the ratchet shaft to rotate.

Images