A wind turbine generator set and its main shaft bearing seat

Abstract

The present invention relates to the technical field of main shafts of wind turbine generator sets, and in particular to a wind turbine generator set and its main shaft bearing seat, comprising a bearing seat body, wherein the main shaft rotates through the bearing seat body through the bearing, and a plurality of equidistantly arranged channels are formed between the bearing seat body and the bearing; a pipe is fixedly connected to the bottom of the bearing seat body, and the pipe is communicated with the channel; a fan blade assembly is arranged inside the pipe, and the fan blade assembly is connected to the main shaft through a transmission mechanism, and when the main shaft rotates, the fan blade assembly works to make the external low-temperature air flow through the channel; the transmission mechanism comprises a transmission belt; the fan blade assembly is squeezed and away from the main shaft by an elastic squeezing assembly, so that the transmission belt is tensioned; a sensing unit is arranged below the fan blade assembly. The present invention enables the bearing to maintain concentricity with the bearing seat body for a long time, thereby ensuring the safe and stable operation of the main shaft.

Description

Technical Field

[0001] The invention relates to the technical field of main shafts of wind power generator sets, in particular to a wind power generator set and a main shaft bearing seat thereof. Background Art

[0002] A wind turbine is a system that converts the kinetic energy of wind into electrical energy. The main shaft is the core component of the wind power generation system and plays a vital role. It mainly undertakes transmission and load-bearing functions, connects the wind rotor (including blades and hub) and the generator, and ensures that the kinetic energy generated by the rotation of the wind rotor can be effectively transmitted to the generator, thereby realizing the conversion of wind energy into electrical energy.

[0003] Specifically, when the wind acts on the blades to rotate the rotor, the main shaft transmits this rotational power to the generator through its internal gear system. The generator converts the received rotational power into electrical energy and supplies it to the power grid. Therefore, the performance of the main shaft is directly related to the conversion efficiency and stable operation of the wind turbine generator set.

[0004] Therefore, the main shaft bearing seat also plays an important role. The main function of the bearing seat is to support the main shaft bearing and ensure that the bearing can operate stably and reliably, thereby ensuring the overall performance and safety of the wind turbine. Specifically, the bearing seat provides a solid support structure for the bearing through precise design and manufacturing, so that the bearing can withstand the huge radial and axial forces generated by the rotation of the wind rotor.

[0005] In a high-load working environment such as a wind turbine, the main shaft bearings tend to generate a large amount of heat, and the heat dissipation performance of the bearing seat itself is not enough to quickly dissipate the heat generated by the bearing to the external environment, resulting in serious heat accumulation in the bearing itself, and then accelerated bearing wear. Moreover, the main shaft of the wind turbine is horizontally placed, and most of the weight of the main shaft and structures such as blades will act on the bottom of the bearing, which will accelerate the wear of the bearing itself in a heat-accumulated environment, and ultimately lead to worse concentricity between the main shaft and the bearing seat. Summary of the invention

[0006] The object of the present invention is to provide a wind turbine generator set and a main shaft bearing seat thereof to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A spindle bearing seat, comprising a bearing seat body, wherein the spindle rotates through the bearing seat body through the bearing, and a plurality of equidistantly arranged channels are formed between the bearing seat body and the bearing;

[0009] The bottom of the bearing seat body is fixedly connected with a pipeline, and the pipeline is communicated with the channel;

[0010] A fan blade assembly is arranged inside the pipeline, and the fan blade assembly is connected to the main shaft through a transmission mechanism. When the main shaft rotates, the fan blade assembly works to make the external low-temperature air flow through the channel;

[0011] The transmission mechanism comprises a transmission belt;

[0012] The fan blade assembly is squeezed and moved away from the main shaft by the elastic squeezing assembly, so that the transmission belt is tensioned;

[0013] A sensing unit is disposed below the fan blade assembly, and the sensing unit is used to sense the height position of the fan blade assembly. The sensing unit is electrically connected to the control module.

[0014] Preferably, the sensing unit comprises a pressure sensor.

[0015] Preferably, the sensing unit further comprises a support rod, the support rod is a hollow tubular structure, the top end of the pressure sensor protrudes from the top end surface of the support rod, and the bottom end of the pressure sensor is installed inside the support rod.

[0016] Preferably, the bearing seat body, the main shaft and the two bearings together form a cavity;

[0017] The bottom of the bearing seat body is fixedly connected with a shell, and the inner cavity of the shell is connected with the channel and the pipeline;

[0018] The transmission mechanism is located inside the inner cavity and the cavity;

[0019] The pressure sensor is arranged at the inner bottom of the inner cavity.

[0020] Preferably, the support rod vertically penetrates the inner bottom wall of the shell and is threadedly connected to the inner bottom wall of the shell;

[0021] A nut is threadedly connected on a portion of the support rod located outside the inner cavity.

[0022] Preferably, the bearing seat body comprises a barrel portion and thickened edges integrally formed at both ends of the barrel portion;

[0023] The channel is formed between the thickened rim and the outer ring of the bearing.

[0024] Preferably, a stopper is formed on the inner annular surface of the thickened edge;

[0025] The channel comprises a communicating transverse channel and a communicating vertical channel. The transverse channel is arranged on the inner annular surface of the thickened edge, and the vertical channel is arranged on the side surface of the stop portion close to the bearing.

[0026] Preferably, the fan blade assembly comprises a rotating shaft, a fan blade and a seat bearing, and the fan blade is fixedly mounted on the rotating shaft;

[0027] The transmission mechanism further comprises a first pulley and a second pulley, wherein the first pulley is connected to the second pulley through the transmission belt;

[0028] The second pulley is sleeved and fixed on the rotating shaft.

[0029] Preferably, the elastic extrusion assembly includes a vertically arranged guide rod, a spring and a guide sleeve sleeved on the guide rod, and mounting plates fixed at both ends of the guide rod;

[0030] The mounting plate is fixedly mounted on the inner surface of the housing;

[0031] The guide sleeve is fixedly connected to the seat bearing;

[0032] One end of the spring abuts against the mounting plate located at the top of the guide rod, and the other end of the spring abuts against the guide sleeve;

[0033] The pressure sensor is located directly below the seated bearing.

[0034] A wind power generator set comprises the main shaft bearing seat mentioned above.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention can directly utilize the main shaft to drive the blade assembly to rotate in the pipeline through the set channel, the blade assembly and the transmission belt, so that the external low-temperature air can flow quickly through the channel, and the low-temperature gas absorbs the heat generated by the friction of the bearing and is then discharged through the pipeline, thereby significantly enhancing the heat dissipation performance of the bearing, reducing the wear rate of the bearing, and allowing the bearing to maintain concentricity with the bearing seat body for a long time, ensuring the safe and stable operation of the main shaft; at the same time, in conjunction with the elastic extrusion component and the sensing unit, once the concentricity difference between the bearing seat body and the main shaft reaches a certain level, the elastic extrusion component will squeeze the blade assembly downward, so that the sensing unit senses the signal of the blade assembly moving downward and feeds back to the control module, and the control module takes corresponding measures according to the signal to avoid the situation where the wind turbine generator set is damaged due to the temperature of the concentricity difference between the bearing seat body and the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the present invention;

[0038] Figure 2 It is a front cross-sectional structural schematic diagram of the present invention;

[0039] Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0040] Figure 4 For the present invention Figure 2 Schematic diagram of the local structure in;

[0041] Figure 5 It is a structural schematic diagram of the bearing seat body of the present invention;

[0042] Figure 6 It is a schematic diagram of the side cross-sectional structure of the housing of the present invention;

[0043] Figure 7 It is a schematic side view of the elastic extrusion component of the present invention.

[0044] In the figure: 1. bearing seat body; 11. cylinder; 12. thickened edge; 121. stopper; 2. main shaft; 3. bearing; 31. outer ring; 4. outer shell; 41. inner cavity; 5. pipeline; 6. fan blade assembly; 61. rotating shaft; 62. fan blade; 63. seat bearing; 7. transmission mechanism; 71. first pulley; 72. transmission belt; 73. second pulley; 8. channel; 81. horizontal track; 82. vertical track; 9. elastic extrusion assembly; 91. guide rod; 92. spring; 93. mounting plate; 94. guide sleeve; 10. sensing unit; 101. pressure sensor; 102. support rod; 13. nut; 100. cavity. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] See also Figure 1-Figure 7 , the present invention provides a technical solution:

[0047] A main shaft bearing seat comprises a bearing seat body 1, and a main shaft 2 rotates through the bearing seat body 1 through a bearing 3.

[0048] The above is the prior art and will not be elaborated herein. The differences between the present invention and the prior art are described below.

[0049] like Figure 1-Figure 7 As shown, a plurality of equally spaced channels 8 are formed between the bearing seat body 1 and the bearing 3; the channels 8 are used to form flow passages for airflow at the periphery of the bearing 3, so that the airflow in the external environment can be used to accelerate the heat dissipation of the bearing 3, so that the bearing 3 can always be maintained at a suitable temperature state, preventing the bearing 3 from rapid wear under overheating conditions.

[0050] like Figure 1-Figure 7 As shown, a pipe 5 is fixedly connected to the bottom of the bearing seat body 1. The pipe 5 can be made of metal material (such as steel) and is cylindrical; the pipe 5 is connected to the channel 8; a fan blade assembly 6 is arranged inside the pipe 5, and the fan blade assembly 6 is connected to the main shaft 2 through a transmission mechanism 7. When the main shaft 2 rotates, the power on the main shaft 2 is transmitted to the fan blade assembly 6 through the transmission mechanism 7, so that the fan blade assembly 6 works (or rotates), and the external low-temperature air flows through the channel 8. The low-temperature gas absorbs the heat generated by the friction of the bearing 3 and is then discharged through the pipe 5, thereby further improving the heat dissipation performance of the bearing 3.

[0051] The transmission mechanism 7 in this embodiment includes a transmission belt 72 for transmitting power.

[0052] The fan blade assembly 6 is squeezed and moved away from the main shaft 2 by the elastic squeezing assembly 9, so that the transmission belt 72 is tensioned, so that the power of the main shaft 2 during rotation can be efficiently transmitted to the fan blade assembly 6.

[0053] A sensing unit 10 is provided below the fan blade assembly 6. The sensing unit 10 is used to sense the height position of the fan blade assembly 6. The sensing unit 10 is electrically connected to the control module. In this embodiment, the control module can be the controller of the wind turbine generator set itself, or a general PLC controller can be selected. The main function of the control module is to receive the signal sensed by the sensing unit 10 and take corresponding measures (such as issuing an alarm, etc.) for the signal; the control module can be the FX3U series of Mitsubishi PLC programmable controllers. This series of controllers uses a type of programmable memory for internal storage of programs, executing user-oriented instructions such as logical operations, sequential control, timing, counting and arithmetic operations, and controlling various types of machinery or production processes through digital or analog input / output.

[0054] In the above scheme, through the set channel 8, the fan blade assembly 6 and the transmission belt 72, the main shaft 2 can be directly used to drive the fan blade assembly 6 to rotate in the pipeline 5, so that the external low-temperature air can flow through the channel 8 quickly, and the low-temperature gas absorbs the heat generated by the friction of the bearing 3 and is then discharged through the pipeline 5, thereby significantly enhancing the heat dissipation performance of the bearing 3 and reducing the wear rate of the bearing 3, so that the bearing 3 can maintain the concentricity with the bearing seat body 1 for a long time, ensuring the safe and stable operation of the main shaft 2; at the same time, in conjunction with the elastic extrusion component 9 and the sensing unit 10, once the concentricity difference between the bearing seat body 1 and the main shaft 2 reaches a certain degree, the elastic extrusion component 9 will squeeze the fan blade assembly 6 downward, so that the sensing unit 10 senses the signal of the downward movement of the fan blade assembly 6 and feeds it back to the control module, and the control module takes corresponding measures according to the signal to avoid the situation where the wind turbine generator set is damaged due to the temperature of the concentricity difference between the bearing seat body 1 and the main shaft 2. At the same time, the technical solution recorded in this embodiment can also detect whether the main shaft 2 is bent. Specifically, when the part of the main shaft 2 located inside the bearing seat body 1 is bent, the rotation radius of the main shaft 2 increases. When the bent part of the main shaft 2 rotates to the top, the fan blade assembly 6 will move up under the pull of the transmission belt 72. At this time, there is no contact between the sensing unit 10 and the fan blade assembly 6. When the bent part of the main shaft 2 rotates to the bottom, the fan blade assembly 6 will contact the sensing unit 10 under the extrusion action of the elastic extrusion assembly 9, and generate an electrical signal. In this way, as the main shaft 2 continues to rotate, the electrical signal generated by the sensing unit 10 will be an intermittent signal, so it can be determined that the main shaft 2 is in a bent state and needs to be replaced immediately.

[0055] In this embodiment, the sensing unit 10 includes a pressure sensor 101. Specifically, when the concentricity difference between the bearing seat body 1 and the main shaft 2 reaches a certain degree, the elastic extrusion component 9 will squeeze the fan blade component 6 downward to squeeze the pressure sensor 101. After the pressure sensor 101 is squeezed, an electrical signal will be generated and fed back to the control module. The model of the pressure sensor 101 can be Tedia's 220-20T. The working principle of the pressure sensor 101 of this model is to use a strain gauge as a sensitive element to convert force or pressure into an electrical signal.

[0056] like Figure 1-Figure 7 As shown, the sensing unit 10 further includes a support rod 102, which is a hollow tubular structure, the top end of the pressure sensor 101 protrudes from the top end surface of the support rod 102, and the bottom end of the pressure sensor 101 is installed inside the support rod 102. The hollow tubular support rod 102 is used to protect the sensing unit 10.

[0057] like Figure 1-Figure 7As shown, the bearing seat body 1, the main shaft 2, and the two bearings 3 together form a cavity 100, and the cavity 100 is connected to the channel 8. Under the action of the fan blade assembly 6, external gas will enter the interior of the cavity 100 through the channel 8.

[0058] like Figure 1-Figure 7 As shown, the bottom of the bearing seat body 1 is fixedly connected with a shell 4, and the inner cavity 41 of the shell 4 is connected to the channel 8 and the pipeline 5. Specifically, the inner cavity 41 is used to connect the cavity 100 and the pipeline 5. Under the action of the fan blade assembly 6, the external gas will enter the interior of the cavity 100 through the channel 8, and then be discharged through the pipeline 5. The transmission mechanism 7 is located inside the inner cavity 41 and the cavity 100; the pressure sensor 101 is arranged at the inner bottom of the inner cavity 41. The shell 4 is used to accommodate and protect the transmission mechanism 7. At the same time, the setting of the shell 4 prevents the transmission mechanism 7 from introducing air from the external environment during the transmission process, so that the channel 8, the cavity 100, the inner cavity 41 and the pipeline 5 form a closed gas circulation system. The low-temperature air in the external environment can only enter the gas circulation system through the channel 8, and the air entering the gas circulation system can only be discharged through the pipeline 5.

[0059] like Figure 1-Figure 7 As shown, the support rod 102 vertically penetrates the inner bottom wall of the outer shell 4 and is threadedly connected to the inner bottom wall of the outer shell 4; thereby, the distance between the sensing unit 10 and the fan blade assembly 6 can be adjusted by rotating the support rod 102; a nut 13 is threadedly connected to the portion of the support rod 102 located outside the inner cavity 41, and the nut 13 is used to lock the support rod 102 to prevent the support rod 102 from rotating at a certain speed due to vibration.

[0060] like Figure 1-Figure 7 As shown, the bearing seat body 1 includes a barrel 11 and thickened edges 12 integrally formed at both ends of the barrel 11; a channel 8 is formed between the thickened edge 12 and the outer ring 31 of the bearing 3, and further, a stopper 121 is formed on the inner ring surface of the thickened edge 12; the channel 8 includes a communicating transverse channel 81 and a vertical channel 82, the transverse channel 81 is opened on the inner ring surface of the thickened edge 12, and the vertical channel 82 is opened on the side of the stopper 121 close to the bearing 3. By setting the channel 8 as the transverse channel 81 and the vertical channel 82, the time for the low-temperature air to flow through the surface of the bearing 3 can be extended, and the heat absorption effect is better. At the same time, the low-temperature air can also be turned over when flowing through the surface of the bearing 3 to avoid local overheating of the low-temperature air.

[0061] like Figure 1-Figure 7 As shown, the fan blade assembly 6 includes a rotating shaft 61, a fan blade 62 and a seat bearing 63, and the fan blade 62 is fixedly mounted on the rotating shaft 61; the transmission mechanism 7 also includes a first pulley 71 and a second pulley 73, and the first pulley 71 is connected to the second pulley 73 through a transmission belt 72; the second pulley 73 is sleeved and fixed on the rotating shaft 61.

[0062] like Figure 1-Figure 7 As shown, the elastic extrusion assembly 9 includes a vertically arranged guide rod 91, a spring 92 and a guide sleeve 94 sleeved on the guide rod 91, and a mounting plate 93 fixed at both ends of the guide rod 91; the mounting plate 93 is fixedly mounted on the inner surface of the shell 4; the guide sleeve 94 is fixedly connected to the seat bearing 63; one end of the spring 92 abuts against the mounting plate 93 located at the top of the guide rod 91, and the other end of the spring 92 abuts against the guide sleeve 94; the pressure sensor 101 is located directly below the seat bearing 63, and when the concentricity difference between the bearing seat body 1 and the main shaft 2 reaches a certain degree, the elastic extrusion assembly 9 will squeeze the seat bearing 63 downward, so that the seat bearing 63 contacts with the pressure sensor 101, so that the pressure sensor 101 generates an electrical signal.

[0063] This embodiment also includes a wind turbine generator set, including the main shaft bearing seat mentioned above.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spindle bearing seat, comprising a bearing seat body, wherein the spindle rotates through the bearing and penetrates the bearing seat body, characterized in that: A plurality of equally spaced channels are formed between the bearing seat body and the bearing; The bottom of the bearing seat body is fixedly connected with a pipeline, and the pipeline is communicated with the channel; A fan blade assembly is arranged inside the pipeline, and the fan blade assembly is connected to the main shaft through a transmission mechanism. When the main shaft rotates, the fan blade assembly works to make the external low-temperature air flow through the channel; The transmission mechanism comprises a transmission belt; The fan blade assembly is squeezed and moved away from the main shaft by the elastic squeezing assembly, so that the transmission belt is tensioned; A sensing unit is disposed below the fan blade assembly, and the sensing unit is used to sense the height position of the fan blade assembly. The sensing unit is electrically connected to the control module.

2. A spindle bearing seat according to claim 1, characterized in that: The sensing unit includes a pressure sensor.

3. A spindle bearing seat according to claim 2, characterized in that: The sensing unit further includes a support rod, which is a hollow tubular structure. The top end of the pressure sensor protrudes from the top end surface of the support rod, and the bottom end of the pressure sensor is installed inside the support rod.

4. A spindle bearing seat according to claim 3, characterized in that: The bearing seat body, the main shaft, and the two bearings together form a cavity; The bottom of the bearing seat body is fixedly connected with a shell, and the inner cavity of the shell is connected with the channel and the pipeline; The transmission mechanism is located inside the inner cavity and the cavity; The pressure sensor is arranged at the inner bottom of the inner cavity.

5. A spindle bearing seat according to claim 4, characterized in that: The support rod vertically penetrates the inner bottom wall of the shell and is threadedly connected to the inner bottom wall of the shell; A nut is threadedly connected on a portion of the support rod located outside the inner cavity.

6. A spindle bearing seat according to claim 1, characterized in that: The bearing seat body comprises a barrel portion and thickened edges integrally formed at both ends of the barrel portion; The channel is formed between the thickened rim and the outer ring of the bearing.

7. A spindle bearing seat according to claim 6, characterized in that: The inner annular surface of the thickened edge is formed with a stopper; The channel comprises a communicating transverse channel and a communicating vertical channel. The transverse channel is arranged on the inner annular surface of the thickened edge, and the vertical channel is arranged on the side surface of the stop portion close to the bearing.

8. The spindle bearing seat according to claim 4, characterized in that: The fan blade assembly comprises a rotating shaft, a fan blade and a seat bearing, and the fan blade is fixedly mounted on the rotating shaft; The transmission mechanism further comprises a first pulley and a second pulley, wherein the first pulley is connected to the second pulley through the transmission belt; The second pulley is sleeved and fixed on the rotating shaft.

9. A spindle bearing seat according to claim 8, characterized in that: The elastic extrusion assembly includes a vertically arranged guide rod, a spring and a guide sleeve sleeved on the guide rod, and mounting plates fixed at both ends of the guide rod; The mounting plate is fixedly mounted on the inner surface of the housing; The guide sleeve is fixedly connected to the seat bearing; One end of the spring abuts against the mounting plate located at the top of the guide rod, and the other end of the spring abuts against the guide sleeve; The pressure sensor is located directly below the seated bearing.

10. A wind turbine generator set, characterized in that: A spindle bearing seat comprising any one of claims 1 to 9.

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