Accurate pressure control carbon brush assembly for wind power generator

Abstract

The present application relates to the technical field of generator, specifically relates to a wind driven generator precision pressure control carbon brush assembly, including box body, the inside of box body is equipped with carbon brush and slides, the carbon brush is used for with the sliding ring electrically conductive contact, the inner wall of box body is detachably installed with guide piece, the guide piece is connected with constant force coil spring, and the constant force coil spring can drive the carbon brush to slide in the inside of box body, one end of constant force coil spring away from guide piece is equipped with support shaft, both ends of support shaft are equipped with shaft sleeve assembly, the inner wall of box body is also equipped with elastic sheet assembly, and the elastic sheet assembly corresponds with shaft sleeve assembly one by one, when support shaft is located above elastic sheet assembly, shaft sleeve assembly is fixedly arranged on support shaft, when support shaft is located below elastic sheet assembly, shaft sleeve assembly is rotatably arranged on support shaft, so that the pressing force of the carbon brush of each carbon brush assembly and the sliding ring is basically consistent, and the maintenance and replacement frequency of carbon brush is reduced.

Description

Technical Field

[0001] This invention relates to the field of generator technology, and in particular to a carbon brush assembly for precise pressure control of wind turbine generators. Background Technology

[0002] Carbon brushes are an important component of the generator excitation system. Due to their long-term contact with the high-speed rotating generator slip rings, they are prone to abnormal operating conditions such as sparking, poor contact, and severe wear. Therefore, they need to be replaced regularly and carbon deposits cleaned.

[0003] Existing carbon brush structures, such as the one disclosed in patent application CN102324677A, include a generator on-line brush replacement and carbon dust collection device. This device includes a generator slip ring, which is slidably connected to a carbon brush assembly. The carbon brush assembly comprises a brush holder and carbon brushes, with a constant-pressure coiled spring between the brush holder and the brushes. This constant-force coiled spring applies pressure to the carbon brushes, ensuring good contact between the brushes and the generator slip ring. However, when the generator slip ring's axis is arranged horizontally, some of the carbon brushes are positioned above the slip ring, while some are below. This can easily lead to inconsistent wear on the upper and lower carbon brushes, necessitating frequent maintenance and replacement. Summary of the Invention

[0004] Therefore, it is necessary to provide a precise pressure control carbon brush assembly for wind turbines to address the current technical problem of inconsistent wear of carbon brushes at the upper and lower positions of the slip ring.

[0005] The above objectives are achieved through the following technical solutions:

[0006] A precision pressure control carbon brush assembly for a wind turbine includes a housing. A carbon brush is slidably mounted inside the housing for conductive contact with a slip ring. A guide plate is detachably mounted on the inner wall of the housing, and a constant-force coil spring is connected to the guide plate. The constant-force coil spring drives the carbon brush to slide within the housing, thereby maintaining tight contact between the carbon brush and the slip ring. A support shaft is located at the end of the constant-force coil spring away from the guide plate. The axis of the support shaft is perpendicular to the sliding direction of the carbon brush. Bushing assemblies are located at both ends of the support shaft. A spring is also provided on the inner wall of the housing. The components include a spring assembly and a bushing assembly, each corresponding to a different spring assembly. When the support shaft is above the spring assembly, the bushing assembly is fixedly mounted on the support shaft. As the carbon brush gradually wears down, the spring assembly can prevent the support shaft from moving downwards, thereby reducing the downward pressure force of the constant force coil spring on the carbon brush. When the support shaft is below the spring assembly, the bushing assembly is rotatably mounted on the support shaft. As the carbon brush gradually wears down, the spring assembly causes the bushing assembly to rotate and move upwards. The bushing assembly then drives the support shaft to move upwards and rotate, thereby increasing the upward pushing force of the constant force coil spring on the carbon brush.

[0007] Furthermore, the spring assembly includes a first spring and a second spring, the first spring and the second spring have the same structure, both the first spring and the second spring extend along the sliding direction of the carbon brush, and the first spring and the second spring are offset from each other in the axial direction of the support shaft.

[0008] Furthermore, both the first and second springs include a first inclined section and a second inclined section. The first inclined section and the second inclined section have opposite inclination directions. The first inclined section is positioned closer to the support shaft than the second inclined section. The two first inclined sections form an inverted "eight" shaped flare.

[0009] Furthermore, each end of the support shaft is provided with two bushings distributed along its axial direction, and the two bushings are respectively able to contact the first spring piece and the second spring piece.

[0010] Furthermore, the opposing sides of the first and second springs are both rough surfaces, which can increase the friction between the bushing and the first or second spring.

[0011] Furthermore, the box body is provided with a first card slot and a first card block, and the guide piece is provided with a second card block and a second card slot. The first card slot can engage with the second card block, and the first card block can engage with the second card slot.

[0012] Furthermore, each end of the support shaft is provided with two retaining rings, and the bushing is located between the two retaining rings. When the bushing is fixedly installed on the support shaft, the bushing and the retaining rings are fixedly connected by screws.

[0013] Furthermore, there are two constant force coil springs connected to the guide plate, and the two constant force coil springs are connected to the same support shaft.

[0014] Furthermore, there are two carbon brushes, each corresponding to a constant force coil spring.

[0015] Furthermore, the box body has an internal partition plate that separates the two carbon brushes.

[0016] The beneficial effects of this invention are:

[0017] The wind turbine precision pressure control carbon brush assembly provided by this invention, in use, has multiple wind turbine precision pressure control carbon brush assemblies (hereinafter referred to as carbon brush assemblies) located on the upper and lower sides of a slip ring, respectively. Due to gravity, the clamping force of the carbon brush located above the slip ring on the slip ring is greater than that of the carbon brush located below the slip ring. By fixing the bushing assembly of the carbon brush assembly located above the slip ring to the support shaft, and rotating the bushing assembly of the carbon brush assembly located below the slip ring to the support shaft; as the carbon brushes gradually wear, the upper... The spring assembly of the square carbon brush assembly can prevent the bushing assembly from moving downward, thereby reducing the downward pressure of the constant force coil spring on the carbon brush, and thus reducing the clamping force of the upper carbon brush on the slip ring. Meanwhile, the spring assembly of the lower carbon brush assembly causes the bushing assembly to rotate and move upward. The bushing assembly drives the support shaft to move upward and rotate, thereby increasing the upward pushing force of the constant force coil spring on the carbon brush, and thus increasing the clamping force between the lower carbon brush and the slip ring. In this way, the clamping force between the carbon brush and the slip ring of each carbon brush assembly is basically the same, the wear is basically the same, and the maintenance and replacement frequency of the carbon brush is reduced. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a carbon brush assembly for precise pressure control of a wind turbine provided in an embodiment of the present invention.

[0019] Figure 2 This is a side view of a carbon brush assembly for precise pressure control of a wind turbine provided in an embodiment of the present invention.

[0020] Figure 3 for Figure 2 Schematic diagram of sectional view AA.

[0021] Figure 4 This is a top view of a carbon brush assembly for precise pressure control of a wind turbine provided in an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the guide plate and constant force coil spring in a carbon brush assembly for precise pressure control of a wind turbine provided in an embodiment of the present invention.

[0023] Figure 6 This is a side view of the housing in a carbon brush assembly for precise pressure control of a wind turbine provided in an embodiment of the present invention.

[0024] Figure 7 for Figure 6 BB section view.

[0025] Figure 8 This is a schematic diagram of the spring assembly in the initial state of the carbon brush assembly for precise pressure control of a wind turbine provided in an embodiment of the present invention.

[0026] Figure 9This is a schematic diagram of the spring assembly in the first working state of the carbon brush assembly for precise pressure control of a wind turbine provided in an embodiment of the present invention.

[0027] Figure 10 for Figure 9 Enlarged view of the structure at point C.

[0028] Figure 11 for Figure 10 The second working state diagram.

[0029] Figure 12 This is a schematic diagram illustrating the fit between the carbon brush assembly for precise pressure control of a wind turbine and the slip ring, according to an embodiment of the present invention.

[0030] Figure 13 for Figure 12 Side view.

[0031] in:

[0032] 100. Box body; 1001. First slot; 1002. First locking block; 101. Guide plate; 1011. Second locking block; 1012. Second slot; 102. Constant force coil spring; 103. Carbon brush; 104. First spring; 105. Support shaft; 106. Bushing; 107. Second spring; 108. Screw; 109. Mounting hole; 110. Divider plate; 200. Spring assembly; 300. Slip ring. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0034] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] like Figures 1 to 13 As shown in the figure, an embodiment of the present invention provides a carbon brush assembly for precise pressure control of a wind turbine generator, including a housing 100. A carbon brush 103 is slidably disposed inside the housing 100, and the carbon brush 103 is used for conductive contact with a slip ring 300. A guide plate 101 is detachably installed on the inner wall of the housing 100. The guide plate 101 is connected to a constant force coil spring 102, which drives the carbon brush 103 to slide inside the housing 100, thereby maintaining a tight contact between the carbon brush 103 and the slip ring 300. A support shaft 105 is provided at the end of the constant force coil spring 102 away from the guide plate 101. The axis of the support shaft 105 is perpendicular to the sliding direction of the carbon brush 103. Both ends of the support shaft 105 are provided with bushing assemblies. The inner wall of the body 100 is also provided with a spring plate assembly 200, which corresponds one-to-one with the bushing assembly. When the support shaft 105 is above the spring plate assembly 200, the bushing assembly is fixedly mounted on the support shaft 105. As the carbon brush 103 gradually wears, the spring plate assembly 200 can prevent the bushing assembly from moving downward, thereby reducing the downward pressure force of the constant force coil spring 102 on the carbon brush 103. When the support shaft 105 is below the spring plate assembly 200, the bushing assembly is rotatably mounted on the support shaft 105. As the carbon brush 103 gradually wears, the spring plate assembly 200 causes the bushing assembly to rotate and move upward. The bushing assembly drives the support shaft 105 to move upward and rotate, thereby increasing the upward pushing force of the constant force coil spring 102 on the carbon brush 103.

[0037] In this way, during use, multiple wind turbine precision pressure control carbon brush assemblies (hereinafter referred to as carbon brush assemblies) are located on the upper and lower sides of the slip ring 300, respectively. Due to gravity, the clamping force of the carbon brush 103 located above the slip ring 300 on the slip ring 300 is greater than that of the carbon brush 103 located below the slip ring 300. By fixing the bushing assembly of the carbon brush assembly located above the slip ring 300 to the support shaft 105, the bushing assembly of the carbon brush assembly located below the slip ring 300 is rotated to the support shaft 105. As the carbon brush 103 gradually wears, the spring of the upper carbon brush assembly... Component 200 can prevent the bushing assembly from moving downward, thereby reducing the downward pressure of the constant force coil spring 102 on the carbon brush 103, and thus reducing the clamping force of the upper carbon brush 103 on the slip ring; while the spring assembly 200 of the lower carbon brush assembly causes the bushing assembly to rotate and move upward, driving the support shaft 105 to move upward and rotate, thereby increasing the upward pushing force of the constant force coil spring 102 on the carbon brush 103, and thus increasing the clamping force between the lower carbon brush 103 and the slip ring 300. In this way, the clamping force between the carbon brush 103 and the slip ring 300 of each carbon brush assembly is basically the same, the wear is basically the same, and the maintenance and replacement frequency of the carbon brush 103 is reduced.

[0038] Furthermore, the spring assembly 200 includes a first spring 104 and a second spring 107. The first spring 104 and the second spring 107 have the same structure. Both the first spring 104 and the second spring 107 extend along the sliding direction of the carbon brush 103, and the first spring 104 and the second spring 107 are offset from each other in the axial direction of the support shaft 105. Figure 4 As shown, the first spring 104 is positioned away from the constant force coil spring 102 relative to the second spring 107. This design facilitates rotation of the bushing assembly.

[0039] like Figure 8 As shown, in the initial state, both the first spring 104 and the second spring 107 include a first inclined section and a second inclined section. The inclination directions of the first and second inclined sections are opposite. The first inclined section is positioned closer to the support shaft 105 than the second inclined section, and the two first inclined sections form an inverted "V" shaped flare. The inverted "V" shaped flare design facilitates the insertion of the bushing assembly between the first spring 104 and the second spring 107, allowing the first spring 104 and the second spring 107 to be opened and to reset under their own elastic force, thereby realizing the movement and rotation of the bushing assembly.

[0040] Furthermore, the bushing assembly consists of two bushings 106 axially distributed along the support shaft 105, and the two bushings 106 are respectively able to contact the first spring piece 104 and the second spring piece 107. This design avoids the first spring piece 104 and the second spring piece 107 from obstructing the rotation of the bushing 106.

[0041] Furthermore, the opposing sides of the first spring 104 and the second spring 107 are both rough surfaces, which can increase the friction between the bushing 106 and the first spring 104 or the second spring 107. When the bushing 106 is fixedly mounted on the support shaft 105, the rough surfaces can make the spring assembly 200 formed by the first spring 104 and the second spring 107 more effective in preventing the bushing 106 from moving.

[0042] Furthermore, the housing 100 is provided with a first slot 1001 and a first locking block 1002, and the guide plate 101 is provided with a second locking block 1011 and a second slot 1012. The first slot 1001 can engage with the second locking block 1011, and the first locking block 1002 can engage with the second slot 1012. This facilitates the installation of the guide plate 101 on the housing 100, and the guide plate 101 can be removed from the housing 100 when replacing the carbon brush 103.

[0043] Furthermore, each end of the support shaft 105 is provided with two retaining rings, and the bushing 106 is located between the two retaining rings. The retaining rings are provided with mounting holes 109 for mounting screws 108. When the bushing 106 is fixedly mounted on the support shaft 105, the bushing 106 and the retaining rings are fixedly connected by screws 108. When it is necessary for the bushing 106 to be rotatably mounted on the support shaft 105, the screws 108 can be removed.

[0044] Furthermore, there are two constant force coil springs 102 connected to the guide plate 101, and the two constant force coil springs 102 are connected to the same support shaft 105.

[0045] Furthermore, two carbon brushes 103 are provided, with each carbon brush 103 corresponding to a constant force coil spring 102. This increases the number of carbon brushes 103 that can be installed.

[0046] Furthermore, the housing 100 has an internal partition plate 110 that separates the two carbon brushes 103. This prevents the carbon brushes 103 from vibrating against each other and affecting each other.

[0047] Based on the above embodiments, the usage principle and working process of the embodiments of the present invention are as follows:

[0048] Multiple carbon brush assemblies are installed on the upper and lower sides of the slip ring 300 respectively. The bushing 106 of the carbon brush assembly located above the slip ring 300 is fixedly set to the support shaft 105, and the bushing 106 of the carbon brush assembly located below the slip ring 300 is rotated to the support shaft 105.

[0049] As the carbon brush 103 gradually wears down, such as Figure 10As shown, the spring assembly 200 above the slip ring 300 is in the first working state. At this time, the bushing 106 enters between the first spring 104 and the second spring 107. Since the bushing 106 cannot rotate and there is a large friction between the bushing 106 and the first spring 104 and the second spring 107, the spring assembly 200 of the upper carbon brush assembly can block the support shaft 105 from moving downward, thereby reducing the downward pressure of the constant force coil spring 102 on the carbon brush 103, and further reducing the clamping force of the upper carbon brush 103 on the slip ring 300.

[0050] As the carbon brush 103 gradually wears down, such as Figure 11 As shown, the spring assembly 200 below the slip ring 300 is in the second working state. Since the bushing 106 can rotate, it is relatively easy for the bushing 106 to enter between the first spring 104 and the second spring 107. The two bushings 106 rotate in opposite directions. The elastic restoring force generated after the first spring 104 and the second spring 107 are spread apart can cause the two bushings 106 to rotate and move upward, driving the support shaft 105 to move upward and rotate, thereby increasing the upward pushing force of the constant force coil spring 102 on the carbon brush 103, and further increasing the clamping force between the lower carbon brush 103 and the slip ring 300. In this way, the clamping force between the carbon brush 103 and the slip ring 300 of each carbon brush assembly is basically the same, the wear is basically the same, and the maintenance and replacement frequency of the carbon brush 103 is reduced.

[0051] When the carbon brush 103 needs to be replaced, remove the guide plate 101 from the housing 100 and then replace the carbon brush 103.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A precision pressure control carbon brush assembly for a wind turbine generator, characterized in that, The device includes a housing, inside which a carbon brush is slidably mounted for conductive contact with a slip ring. A guide plate is detachably mounted on the inner wall of the housing, and a constant-force coil spring is connected to the guide plate. The constant-force coil spring drives the carbon brush to slide within the housing, thereby maintaining tight contact between the carbon brush and the slip ring. A support shaft is located at the end of the constant-force coil spring furthest from the guide plate. The axis of the support shaft is perpendicular to the sliding direction of the carbon brush. Both ends of the support shaft are equipped with bushing assemblies. The inner wall of the housing also has spring assemblies, with each spring assembly corresponding to one of the bushing assemblies. The spring assembly includes a first spring and a second spring. The first spring and the second spring have the same structure. Both the first spring and the second spring extend along the sliding direction of the carbon brush, and the first spring and the second spring are offset from each other in the axial direction of the support shaft. Both the first spring and the second spring include a first inclined section and a second inclined section. The first inclined section and the second inclined section have opposite inclination directions. The first inclined section is positioned closer to the support shaft than the second inclined section, and the two first inclined sections form an inverted "8" shaped flare. The bushing assembly consists of two bushings distributed along the axial direction of the support shaft, and the two bushings can respectively contact the first spring and the second spring; each end of the support shaft is provided with two retaining rings, and the bushing is located between the two retaining rings. When the bushing is fixedly installed on the support shaft, the bushing and the retaining rings are fixedly connected by screws. When the support shaft is above the spring assembly, the bushing assembly is fixedly mounted on the support shaft. As the carbon brush gradually wears down, the spring assembly can prevent the bushing assembly from moving downwards, thereby reducing the downward pressure force of the constant force coil spring on the carbon brush. When the support shaft is below the spring assembly, the bushing assembly is rotatably mounted on the support shaft. As the carbon brush gradually wears down, the spring assembly causes the bushing assembly to rotate and move upwards. The bushing assembly drives the support shaft to move upwards and rotate, thereby increasing the upward pushing force of the constant force coil spring on the carbon brush.

2. The wind turbine precision pressure control carbon brush assembly according to claim 1, characterized in that, The opposing sides of the first and second springs are both rough surfaces, which can increase the friction between the bushing and the first or second spring.

3. The wind turbine precision pressure control carbon brush assembly according to claim 1, characterized in that, The box body is provided with a first card slot and a first card block, and the guide piece is provided with a second card block and a second card slot. The first card slot can engage with the second card block, and the first card block can engage with the second card slot.

4. The wind turbine precision pressure control carbon brush assembly according to claim 1, characterized in that, There are two constant force coil springs connected to the guide plate, and the two constant force coil springs are connected to the same support shaft.

5. The wind turbine precision pressure control carbon brush assembly according to claim 4, characterized in that, The carbon brush is provided in two parts, and each carbon brush is set in a one-to-one correspondence with a constant force coil spring.

6. The wind turbine precision pressure control carbon brush assembly according to claim 5, characterized in that, The box body has an internal partition plate that separates the two carbon brushes.

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