Doubly-fed motor vertical slip ring frame mounting structure and application thereof

Abstract

The invention belongs to the technical field of wind power generation, and relates to a double-fed motor vertical slip ring frame mounting structure and application thereof. The structure comprises: a slip ring chamber vertically fixed on a frame, wherein the slip ring chamber comprises a slip ring and a slip ring brush holder; the upper part of the slip ring is provided with a grounding ring, the grounding ring is connected with a motor rotating shaft, the grounding ring is provided with a mounting spigot surface for mounting an encoder assembly, the encoder assembly is fixed above a grounding brush through a fastener, and the grounding brush is pressed on the grounding ring; the bottom of the slip ring is also provided with three rotor outgoing line connecting blocks which are used for fixedly connecting the rotor outgoing line with the slip ring brush carrier. An insulating plate is further installed below the slip ring brush holder, and a sealing piece is arranged between the insulating plate and the slip ring brush holder. The slip ring brush holder can be applied to the fields of vertical axis wind power generation, pumped storage power generation and the like, can effectively solve the installation problem of the slip ring brush holder in the vertical installation process of the doubly-fed motor, is favorable for adjusting the power factor of a power grid and enhancing the stability of the power grid, and expands the application range of the doubly-fed motor.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wind power generation, and relates to a doubly-fed motor, in particular to a vertical slip ring frame mounting structure of a doubly-fed motor and application thereof. BACKGROUND

[0002] With the rapid development of the new energy market, the single-machine power of the doubly-fed motor in the field of wind power generation is continuously increasing, and the volume of the motor is also increasing. At present, the doubly-fed wind power generator generally adopts a horizontal installation mode in the use process, and the slip ring chamber is also horizontally installed at the tail of the motor. However, with the increasing load borne by key parts such as bearings and slip rings, the traditional installation mode has been difficult to meet the needs of diversified application scenarios.

[0003] The doubly-fed motor has the advantages of adjustable speed and power factor, and its application field is also continuously expanding. Especially in specific scenarios such as hydroelectric power generation and vertical-axis wind power generation, the equipment has a hard requirement for vertical installation of the motor, and the slip ring chamber also needs to adopt a vertical installation scheme. Under this condition, how to ensure that the slip ring chamber realizes mechanical precision, electrical operation reliability and convenient maintenance at the same time in vertical installation has become a technical problem to be solved.

[0004] Therefore, the present application is proposed. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a vertical slip ring frame mounting structure of a doubly-fed motor and application thereof to solve the installation problem of the slip ring brush frame of the doubly-fed motor in vertical installation.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions. On the one hand, the present application provides a vertical slip ring frame mounting structure of a doubly-fed motor, which comprises: a slip ring chamber vertically fixed on a rack, wherein the slip ring chamber comprises a slip ring and a slip ring brush frame; the upper part of the slip ring is provided with a grounding ring, the bottom of the slip ring is connected with a motor rotating shaft, the grounding ring is processed with a mounting stop face for installing an encoder assembly, the encoder assembly is fixed above the grounding brush through a fastener, and the grounding brush is crimped on the grounding ring; The lower part of the slip ring is a K, L and M three-phase conductive ring, each phase conductive ring introduces the rotor excitation power to the corresponding slip ring brush frame through a carbon brush, the slip ring brush frame is provided with a first mounting interface for installing a cable, and the cable is introduced from a reserved cable gland installation plate on the side surface of the slip ring chamber shell; The bottom of the slip ring is provided with a mounting stop face for mounting a flange, and the flange is fixed to the rotating shaft of the double-fed motor through fasteners; the bottom of the slip ring is also provided with three rotor lead-out wire connecting blocks for fixedly connecting the rotor lead-out wires with the slip ring brush holder; an insulating plate is also mounted below the slip ring brush holder, and a sealing element is arranged between the insulating plate and the slip ring brush holder.

[0007] Specifically, the bottom of the slip ring is provided with a mounting stop face for mounting a flange, and the flange is fixed to the rotating shaft of the double-fed motor through fasteners (such as bolts).

[0008] Specifically, the rotor lead-out wire connecting block comprises a first connecting block and a vertical connecting plate (the joint surface of the first connecting plate and the vertical connecting plate is in an arc surface structure) arranged perpendicularly to the first connecting block, the first connecting block is connected with the supporting rod of the slip ring, and two mounting holes are formed in the vertical connecting plate for connecting the rotor lead-out wires.

[0009] Specifically, the encoder assembly comprises an encoder small shaft and a supporting assembly, the encoder small shaft is fixedly mounted on the grounding ring through the mounting stop face; the supporting assembly comprises a central shaft for mounting the encoder, at least three supporting beams are uniformly distributed along the circumference of the central shaft, a vertical supporting rod is fixed below each supporting beam, and each vertical supporting rod is fixedly connected with the upper surface of the encoder small shaft.

[0010] Specifically, the outer part of the slip ring chamber shell is provided with a cooling fan, and the cooling fan introduces air into the slip ring chamber through a pipeline.

[0011] Specifically, the slip ring chamber shell is also provided with an air outlet cylinder, and a carbon powder filtering device is mounted at the tail of the air outlet cylinder.

[0012] Specifically, the slip ring chamber shell comprises an outer shell with a polygonal cross section, and the outer shell comprises a cover plate, a bottom plate, and a surrounding plate between the cover plate and the bottom plate.

[0013] Specifically, the surrounding plate is detachably connected with a first cover plate which facilitates maintenance and repair, the air outlet cylinder is located at one side of the first cover plate, and a second lead-out cable gland mounting plate is arranged on the surrounding plate opposite to the first lead-out cable gland mounting plate.

[0014] Further, a monitoring device for monitoring the temperature of the carbon brush is mounted inside the slip ring chamber. Preferably, the monitoring device comprises a temperature sensor.

[0015] In another aspect, the application also provides an application of the double-fed motor vertical slip ring holder mounting structure as described above in part or in whole in the field of vertical axis wind power generation and pumped storage power generation.

[0016] In addition, the application also provides a double-fed motor comprising the vertical slip ring frame mounting structure as described above in part or in whole, and a rotating shaft of the double-fed motor penetrates through the vertical slip ring frame mounting structure.

[0017] Compared with the prior art, the technical scheme provided by the application has the following beneficial effects: 1) The vertical slip ring frame mounting structure of the double-fed motor provided by the application integrates the grounding ring and the grounding brush in one and locates them at the upper part of the slip ring, and the encoder assembly is fixed above the grounding brush through bolts, and the upper part of the grounding ring is processed with a mounting stop face for installing the small shaft of the encoder, which is beneficial to ensure the perpendicularity of the small shaft of the encoder in operation and the runout amount within the normal operation range of the encoder.

[0018] 2) The vertical slip ring frame mounting structure provided by the application can be applied to the fields of vertical shaft wind power generation, pumped storage power generation and the like, can effectively solve the installation problem of the slip ring brush frame of the double-fed motor in the vertical installation process, is beneficial to adjust the power factor of the power grid, enhance the stability of the power grid, expand the application range of the double-fed motor, and can be applied to the scenarios of replacing small hydroelectric power generation and the like in the future. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate the principles of the application and, together with the description, serve to explain the application.

[0020] In order to more clearly illustrate the technical schemes in the embodiments of the application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without any creative labor under the premise of these drawings.

[0021] Figure 1 A vertical slip ring frame mounting structure of a double-fed motor provided by the application is shown in the figure; Figure 2 An exploded view of the vertical slip ring frame mounting structure of the double-fed motor provided by the application is shown in the figure; Figure 3 A structure schematic view of a slip ring chamber in the application is shown in the figure; Figure 4 A sectional view of the slip ring chamber provided by the application is shown in the figure.

[0022] Wherein: 1, slip ring chamber; 1-1, slip ring; 1-2, slip ring brush holder; 1-3, ground ring; 1-4, rotor lead-out line connecting block; 2, encoder assembly; 2-1, encoder small shaft; 2-2, support assembly; 2-2-1, center shaft; 2-2-2, support beam; 2-2-3, vertical support rod; 2-3, encoder; 2-4, encoder protective cover; 3, lead-out cable grid mounting plate; 4, cooling fan; 5, air outlet cylinder; 6, first cover plate; 7, insulating plate; 8, rack. DETAILED DESCRIPTION

[0023] The exemplary embodiments will be described in detail herein below with reference to the drawings. In the following description, the same numbers refer to the same or similar elements unless otherwise represented. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Rather, they are merely examples consistent with some aspects of the present application as detailed in the appended claims.

[0024] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and examples.

[0025] Example 1 Referring to Figures 1-4 As shown, the embodiment provides a vertical slip ring mounting structure of a double-fed motor, comprising: a slip ring chamber 1 vertically fixed on a rack 8, the slip ring chamber 1 comprising a slip ring 1-1 and a slip ring brush holder 1-2; the upper part of the slip ring 1-1 is provided with a ground ring 1-3, the bottom of the slip ring 1-1 is connected with a motor rotating shaft, the ground ring 1-3 is processed with a mounting stop face for mounting an encoder assembly 2, the encoder assembly 2 is fixed above the ground brush through fasteners, and the ground brush is crimped on the ground ring 1-3; The lower part of the slip ring 1-1 is a K, L, M three-phase conductive ring, each phase conductive ring leads out the rotor excitation power to the corresponding phase slip ring brush holder 1-2 through a carbon brush, the slip ring brush holder 1-2 is provided with a first mounting interface for mounting a cable, and the cable is led out from a lead-out cable gland mounting plate 3 reserved on the side surface of the slip ring chamber 1 shell; The bottom of the slip ring 1-1 is processed with a mounting stop face for mounting a flange, the flange is fixed with the double-fed motor rotating shaft through fasteners; the bottom of the slip ring 1-1 is also provided with three rotor lead-out line connecting blocks 1-4 for fixedly connecting the rotor lead-out line with the slip ring brush holder 1-2; the lower part of the slip ring brush holder 1-2 is also provided with an insulating plate 7, and a sealing element is arranged between the insulating plate 7 and the slip ring brush holder 1-2.

[0026] Further, the encoder assembly 2 comprises an encoder shaft 2-1 fixedly installed on the grounding ring 1-3 through a mounting stop face, and a support assembly 2-2, which comprises a central shaft 2-2-1 for mounting the encoder 2-3, at least three support beams 2-2-2 evenly distributed along the circumference of the central shaft 2-2-1, and a vertical support rod 2-2-3 fixed below each support beam 2-2-2, each vertical support rod 2-2-3 being fixedly connected with the upper surface of the encoder shaft 2-1.

[0027] Further, the outer part of the slip ring chamber 1 shell is provided with a cooling fan 4, which introduces air into the slip ring chamber 1 through a pipeline; the slip ring chamber 1 shell is also provided with an air outlet cylinder 5, the tail part of which is provided with a carbon powder filtering device. The shape of the air outlet cylinder is not limited to a cylindrical or trumpet shape, and in principle, as long as it can achieve ventilation.

[0028] In this embodiment, the slip ring chamber 1 shell comprises a shell with a polygonal cross section (in this embodiment, a regular octagonal cross section), which comprises a cover plate, a bottom plate, and a surrounding plate between the cover plate and the bottom plate. Preferably, the surrounding plate is detachably connected with a first cover plate 6 for facilitating maintenance and repair, the air outlet cylinder 5 is located on one side of the first cover plate 6, and the other side of the first cover plate 6 is provided with a first outgoing cable gland mounting plate, and the surrounding plate opposite to the first outgoing cable gland mounting plate is provided with a second outgoing cable gland mounting plate. It should be noted that the first outgoing cable gland mounting plate and the second outgoing cable gland mounting plate can also be arranged at adjacent positions.

[0029] Preferably, the sealing member is a wool felt, which is used to seal the gap between the rotating member slip ring and the slip ring chamber, so as to prevent the carbon powder from leaking out.

[0030] Further, the slip ring chamber 1 is also provided with a monitoring device for monitoring the temperature of the carbon brush, which can be a temperature sensor.

[0031] The above-mentioned vertical slip ring frame mounting structure needs to be checked for the strength of the frame 8 and the slip ring 1-1 during design to ensure the reliability of the structure; the frame 8 needs to be processed to have a mounting stop face for mounting the slip ring brush frame 1-2, thereby ensuring the verticality of the overall installation of the slip ring chamber 1. The specific installation process of the vertical slip ring frame mounting structure is as follows: First, the slip ring 1-1 is connected with the motor shaft through a mounting stop face and a flange, and then the encoder assembly 2 is installed on the top; the insulating plate 7 is installed at the lower part of the slip ring brush frame 1-2, and the sealing member (wool felt) is fixed by bolts and installed on the frame 8; finally, the slip ring chamber 1 shell, the encoder 2-3, the encoder protective cover 2-4, and other components are installed.

[0032] Furthermore, the embodiment also provides application of the vertical shaft wind power generation and pumped storage power generation of the double-fed motor vertical slip ring mounting structure as described in the above part or all.

[0033] The above description is merely that of the embodiments of the application, which enables those skilled in the art to understand or implement the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application.

[0034] It should be understood that the application is not limited to the above-described and described, and can be variously modified and changed without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A doubly-fed motor vertical slip ring mounting structure, characterized in that: include: A slip ring chamber (1) is vertically fixed on a frame (8), wherein the slip ring chamber (1) includes a slip ring (1-1) and a slip ring brush holder (1-2); a grounding ring (1-3) is provided on the upper portion of the slip ring (1-1), the bottom of the slip ring (1-1) is connected to the motor shaft, and a mounting stop surface for mounting an encoder assembly (2) is machined on the grounding ring (1-3); the encoder assembly (2) is fixed above the grounding brush by a fastener, and the grounding brush is press-fitted onto the grounding ring (1-3); Below the slip ring (1-1) are three-phase conductive rings K, L, and M. Each phase conductive ring leads the rotor excitation power supply to the corresponding phase slip ring brush holder (1-2) through a carbon brush. The slip ring brush holder (1-2) is provided with a first installation interface for installing a cable. The cable is led out from a lead-out cable gland installation plate (3) reserved on the side of the slip ring chamber (1) housing. The bottom of the slip ring (1-1) is processed with a mounting stop surface for mounting a flange, and the flange is fixed to the rotating shaft of the doubly fed generator via fasteners; the bottom of the slip ring (1-1) is also provided with three rotor lead-out wire connection blocks (1-4) for fixedly connecting the rotor lead-out wires to the slip ring brush holder (1-2); an insulating plate (7) is also installed below the slip ring brush holder (1-2), and a sealing member is provided between the insulating plate (7) and the slip ring brush holder (1-2).

2. The doubly-fed generator vertical slip ring mounting structure according to claim 1, characterized in that: The encoder assembly (2) comprises an encoder shaft (2-1) and a support assembly (2-2), wherein the encoder shaft (2-1) is fixedly mounted on a grounding ring (1-3) via a mounting stop surface; the support assembly (2-2) comprises: a central shaft (2-2-1) for mounting the encoder (2-3), at least three support beams (2-2-2) uniformly distributed circumferentially along the central shaft (2-2-1), a vertical support rod (2-2-3) being fixed below each support beam (2-2-2), and each vertical support rod (2-2-3) being fixedly connected to the upper surface of the encoder shaft (2-1).

3. The doubly-fed generator vertical slip ring mounting structure according to claim 1, characterized in that: A cooling fan (4) is provided outside the outer shell of the slip ring chamber (1), and the cooling fan (4) introduces air into the slip ring chamber (1) through a pipeline.

4. The doubly-fed generator vertical slip ring mounting structure according to claim 1, characterized in that: The outer shell of the slip ring chamber (1) is further provided with an air outlet cylinder (5), and a carbon powder filtering device is installed at the tail of the air outlet cylinder (5).

5. The doubly-fed generator vertical slip ring mounting structure according to claim 1, characterized in that: The slip ring chamber (1) housing comprises a housing with a polygonal cross section, and the housing comprises a cover plate, a bottom plate, and a surrounding plate located between the cover plate and the bottom plate.

6. The doubly-fed generator vertical slip ring mounting structure according to claim 5, characterized in that: The enclosure is detachably connected to a first cover plate (6) for easy inspection and maintenance. The air outlet duct (5) is located on one side of the first cover plate (6). A first lead-out cable gland mounting plate is provided on the other side of the first cover plate (6). A second lead-out cable gland mounting plate is provided on the enclosure opposite to the first lead-out cable gland mounting plate.

7. The doubly-fed generator vertical slip ring mounting structure according to claim 1, characterized in that: The sealing element is made of wool felt.

8. The doubly-fed generator vertical slip ring mounting structure according to claim 1, characterized in that: A monitoring device for monitoring the temperature of the carbon brush is installed inside the slip ring chamber (1).

9. An application of the doubly-fed generator vertical slip ring mounting structure according to any one of claims 1 to 8 in the fields of vertical axis wind power generation and pumped storage power generation.

10. A doubly-fed electric machine, characterized in that: It comprises the vertical slip ring mounting structure according to any one of claims 1 to 8, wherein the rotating shaft of the doubly-fed motor passes through the vertical slip ring mounting structure.

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