Brushless exciter cooling structure with built-in centrifugal fan

Abstract

The utility model relates to the technical field of exciter cooling, in particular to a brushless exciter cooling structure with a built-in centrifugal fan, which comprises an armature structure, a stator structure and a centrifugal fan. The armature structure comprises an armature winding and an armature cylinder coaxially arranged with the generator shaft, one end of the armature cylinder is closed and connected with the generator shaft, and the armature winding is arranged on the cylinder wall of the armature cylinder; the stator structure comprises an annular engine base and an excitation winding, one side of the annular engine base is provided with an annular groove, the cylinder wall of one end of the armature cylinder is nested by the annular groove, a gap is formed between the annular groove and the cylinder wall of the armature cylinder, and the excitation winding is arranged at the position, corresponding to the armature winding, of the side wall of the annular groove; the centrifugal fan is arranged in the armature cylinder and connected with the closed end of the armature cylinder, and the centrifugal fan and the armature cylinder are coaxial. The utility model has the advantages that a plurality of air flow channels are formed through the gap between the armature cylinder and the annular base, and then air flows in the air flow channels through the centrifugal fan so as to cool the exciter.

Description

Technical Field

[0001] The utility model relates to the technical field of exciter cooling, in particular to a brushless exciter cooling structure with a built-in centrifugal fan. Background Art

[0002] The exciter provides power to the rotor of the generator so that the generator rotor can generate a working magnetic field. During the operation of the exciter, heat is generated and needs to be cooled.

[0003] refer to Figure 1 , is a structural diagram of an existing exciter cooling structure. The left side is the generator, and the right side is the exciter. The generator and the exciter share a cooler. The cooling gas is transported from the generator to the exciter, and passively circulates in the exciter to cool the exciter. After cooling, the gas returns to the generator to form a cycle. However, this technical solution is only suitable for air-cooled generators, not liquid-cooled generators; and the current power generation of generators is getting larger and larger, and the cooling structure of the shared cooler has a small air volume, which is gradually unable to meet the cooling needs of the exciter. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a brushless exciter cooling structure with a built-in centrifugal fan.

[0005] The purpose of the utility model is achieved through the following technical solutions: a brushless exciter cooling structure with a built-in centrifugal fan, comprising an armature structure, a stator structure and a centrifugal fan; the armature structure comprises an armature winding and an armature cylinder coaxially arranged with a generator shaft, one end of the armature cylinder is closed and connected to the generator shaft, and the armature winding is arranged on the cylinder wall of the armature cylinder; the stator structure comprises an annular machine base and an excitation winding, one side of the annular machine base is provided with an annular groove, the annular groove nests the cylinder wall of one end of the armature cylinder and forms a gap with the cylinder wall of the armature cylinder, and the excitation winding is arranged on the side wall of the annular groove corresponding to the cylinder wall of the armature cylinder. The position of the armature winding; the centrifugal fan is arranged in the armature barrel and connected to the closed end of the armature barrel, and the centrifugal fan is coaxial with the armature barrel; the space in the center of the annular base forms a first air flow channel, and the gaps between the barrel wall of the armature barrel and the two side walls of the annular groove respectively form a second air flow channel and a third air flow channel, the first air flow channel, the second air flow channel and the third air flow channel are connected in sequence, the centrifugal fan is located at the end of the first air flow channel, the air inlet end of the centrifugal fan is connected to the first air flow channel, and the exhaust end of the centrifugal fan is connected to the second air flow channel.

[0006] The utility model forms a first air flow channel, a second air flow channel and a third air flow channel which are connected in sequence through the annular machine base and the armature cylinder, and uses a centrifugal fan to actively circulate air in the air flow channel to take away the heat during the operation of the exciter, cool the exciter, and improve the cooling effect. In addition, the cooling structure is separated from the generator and is not limited by the type of the generator cooling structure.

[0007] In some embodiments, a wind shielding ring plate is provided between the end position of the first air flow channel on the annular base and the edge of the air inlet end of the centrifugal fan. The wind shielding ring plate shields the gap between the edge of the centrifugal fan and the first air flow channel to prevent air from flowing back from the second air flow channel to the first air flow channel.

[0008] In some embodiments, the generator further comprises a housing, the housing enclosing the armature structure and the stator structure, the generator shaft passing through the housing from the outside and connected to the armature cylinder in the housing. The housing improves the safety of the exciter during operation.

[0009] In some embodiments, a gap is provided between the housing and the annular base to form a fourth air flow channel, the fourth air flow channel being connected to the third air flow channel and the first air flow channel. The fourth air flow channel allows heat in the air to be transferred to the housing for heat dissipation.

[0010] In some embodiments, a cooler is disposed in the fourth air flow channel. The air flowing through the cooler is cooled by heat exchange by the cooler, and the cooled air enters the first air flow channel again through the fourth air flow channel to form a cycle, thereby improving the cooling effect.

[0011] In some embodiments, the armature winding includes an armature core and an armature coil, wherein the armature core is disposed on the inner wall of the armature tube, and the armature coil is wound on the armature core. Arranging the armature core on the inner wall of the armature tube can reduce the volume of the exciter compared to arranging it on the outer wall.

[0012] In some embodiments, the excitation winding includes an excitation core and an excitation coil. The excitation core is arranged on the side wall of the annular groove close to the center of the annular base. The position of the excitation core corresponds to the armature core, and the excitation coil is wound on the excitation core.

[0013] In some embodiments, a rectifier module is further included, the rectifier module is arranged at one closed end inside the armature tube, the rectifier module is electrically connected to the armature winding, and the rectifier module rectifies the alternating current generated by the armature winding and supplies it to the generator rotor excitation.

[0014] The utility model has the following advantages:

[0015] The utility model arranges an annular groove on the annular base, utilizes the annular groove to nest one end of the armature cylinder to form the second air flow channel and the third air flow channel, utilizes the space in the center of the annular base as the first air flow channel, and arranges a centrifugal fan in the armature cylinder so that the centrifugal fan is located at the end of the first air flow channel, the air inlet end of the centrifugal fan is connected to the first air flow channel, and the air exhaust end of the centrifugal fan is connected to the second air flow channel. The rotation of the centrifugal fan will drive the air to enter the first air flow channel, the second air flow channel, the third air flow channel and the fourth air flow channel in sequence to take away the heat, and the air is cooled by the cooler in the fourth air flow channel, thereby further enhancing the cooling effect, and the independent cooling structure of the exciter is not limited by the cooling structure type of the generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a structural diagram of an existing exciter cooling structure;

[0017] Figure 2 This is a cooling structure diagram of a brushless exciter with a built-in centrifugal fan of the utility model;

[0018] In the figure: 1. armature cylinder; 2. armature winding; 21. armature core; 22. armature coil; 3. annular base; 31. annular groove; 4. excitation winding; 41. excitation core; 42. excitation coil; 5. centrifugal fan; 61. first air flow channel; 62. second air flow channel; 63. third air flow channel; 64. fourth air flow channel; 7. rectifier module; 8. cooler; 9. casing. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0020] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0021] like Figure 2 As shown, a brushless exciter cooling structure with a built-in centrifugal fan includes an armature structure, a stator structure and a centrifugal fan 5;

[0022] The armature structure includes an armature winding 2 and an armature cylinder 1 coaxially arranged with the generator shaft, one end of the armature cylinder 1 is closed and connected with the generator shaft, and the armature winding 2 is arranged on the cylinder wall of the armature cylinder 1;

[0023] The stator structure includes an annular base 3 and an excitation winding 4. A ring groove 31 is provided on one side of the annular base 3. The ring groove 31 embeds the wall of one end of the armature cylinder 1 and forms a gap with the wall of the armature cylinder 1. The excitation winding 4 is arranged on the side wall of the ring groove 31 at a position corresponding to the armature winding 2.

[0024] The centrifugal fan 5 is disposed in the armature barrel 1 and connected to the closed end of the armature barrel 1, and the centrifugal fan 5 is coaxial with the armature barrel 1;

[0025] The space at the center of the annular base 3 forms a first air flow channel 61, and the gaps between the barrel wall of the armature barrel 1 and the two side walls of the annular groove 31 respectively form a second air flow channel 62 and a third air flow channel 63, the first air flow channel 61, the second air flow channel 62 and the third air flow channel 63 are connected in sequence, the centrifugal fan 5 is located at the end of the first air flow channel 61, the air inlet end of the centrifugal fan 5 is connected to the first air flow channel 61, and the exhaust end of the centrifugal fan 5 is connected to the second air flow channel 62.

[0026] Specifically, in this embodiment, the generator shaft is arranged horizontally, the armature barrel 1 and the annular base 3 are arranged coaxially with the generator shaft, the closed end of the armature barrel 1 is connected to the generator shaft and driven to rotate by the generator shaft, and the annular base 3 is fixed. The center of the annular base 3 has a cylindrical space and forms a first air flow channel 61.

[0027] In the nested arrangement of the armature barrel 1 and the annular groove 31 of the annular base 3, there is a gap between the barrel wall of the armature barrel 1 and the two side walls of the annular groove 31, there is a gap between the side of the annular base 3 with the annular groove 31 and the closed end of the armature barrel 1, and there is a gap between the end of the armature barrel 1 and the bottom of the annular groove 31, so the first air flow channel 61, the second air flow channel 62 and the third air flow channel 63 are connected in sequence to form an S-shaped air flow channel. The centrifugal fan 5 is arranged in the armature barrel 1, and its air inlet end is located at the end of the cylindrical space in the center of the annular base 3. The air inlet end of the centrifugal fan 5 is connected to the first air flow channel 61, and the exhaust end on the side of the centrifugal fan 5 is connected to the second air flow channel 62.

[0028] During the application of this embodiment, the generator shaft rotates, driving the armature cylinder 1 to rotate, so that the armature winding 2 provides excitation current for the generator rotor. During the rotation of the armature cylinder 1, the centrifugal fan 5 is driven to rotate, so that air flows from the first air flow channel 61 to the second air flow channel 62. The air passes through the second air flow channel 62 and the third air flow channel 63 from the first air flow channel 61 in turn, taking away the heat generated in the armature winding 2 and the excitation winding 4, and the heat dissipation efficiency is relatively high.

[0029] Preferably, a wind shielding ring plate is provided between the end position of the first air flow channel 61 on the annular base 3 and the edge of the air inlet end of the centrifugal fan 5. The wind shielding ring plate is provided at the end of the cylindrical space in the center of the annular base 3, that is, the end of the first air flow channel 61. There is a certain gap between the centrifugal fan 5 and the end of the first air flow channel 61, through which the air can flow back from the second air flow channel 62 to the first air flow channel 61, thereby reducing the heat dissipation effect. In order to reduce the air that flows back from the second air flow channel 62 to the first air flow channel 61, a wind shielding ring plate is provided to block the gap between the edge of the air inlet end of the centrifugal fan 5 and the end of the first air flow channel 61, thereby ensuring that the first air flow channel 61 and the second air flow channel 62 are connected through the centrifugal fan 5, thereby avoiding direct connection between the first air flow channel 61 and the second air flow channel 62, thereby ensuring the stable flow direction of the air.

[0030] Preferably, it further comprises a shell 9, which encloses the armature structure and the stator structure, and the generator shaft passes through the shell 9 from the outside and is connected to the armature cylinder 1 in the shell 9. The shell 9 encloses the armature structure and the stator structure, thereby improving the safety of the exciter cooling structure during operation.

[0031] Preferably, there is a gap between the housing 9 and the annular base 3 and a fourth air flow channel 64 is formed, and the fourth air flow channel 64 is connected with the third air flow channel 63 and the first air flow channel 61. Since the housing 9 wraps the stator structure and the armature structure, a fourth air flow channel 64 is formed between the housing 9 and the annular base 3, and the fourth air flow channel 64 is connected with the third air flow channel 63 and the first air flow channel 61 respectively through the cavity in the housing 9. During the operation of the exciter, the air is driven by the centrifugal fan 5, passes through the first air flow channel 61, the second air flow channel 62, the third air flow channel 63 and the fourth air flow channel 64 in sequence, and returns to the first air flow channel 61 after passing through the fourth air flow channel 64, forming an air cycle.

[0032] Preferably, a cooler 8 is provided in the fourth air flow channel 64. Specifically, in the present embodiment, the cooler 8 is an air heat exchanger, which is a common component for those skilled in the art, and its structure is not described in detail here. When the air flows through the air heat exchanger, the heat in the air is transferred through the heat exchange medium in the air heat exchanger, so that the air is cooled, and the cooled air returns to the first air flow channel 61, forming a circulating heat dissipation to achieve a better heat dissipation effect.

[0033] Preferably, the armature winding 2 includes an armature core 21 and an armature coil 22, wherein the armature core 21 is arranged on the inner wall of the armature tube 1, and the armature coil 22 is wound on the armature core 21. Arranging the armature core 21 on the inner wall of the armature tube 1 has the advantage of reducing the volume of the armature structure compared to arranging the armature core 21 on the outer wall of the armature tube 1, so as to reduce the overall volume of the exciter.

[0034] Preferably, the field winding 4 includes a field core 41 and a field coil 42, the field core 41 is arranged on the side wall of the annular groove 31 close to the center of the annular base 3, the position of the field core 41 corresponds to the armature core 21, and the field coil 42 is wound on the field core 41. Since the armature core 21 is arranged on the inner wall of the armature cylinder 1, the field core 41 is arranged on the side wall of the annular groove 31 close to the center of the annular base 3, so as to correspond to the position of the armature core 21.

[0035] Preferably, a rectifier module 7 is further included, and the rectifier module 7 is arranged at one end closed inside the armature tube 1, and the rectifier module 7 is electrically connected to the armature winding 2. The rectifier module 7 is a common mold component used by those skilled in the art, and its structure is not described here. The rectifier module 7 is arranged at the closed end of the armature tube 1 to reduce the volume of the device, and the air in the second air flow channel 62 can be used to cool down, thereby achieving cooling of the rectifier module 7.

[0036] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the above-mentioned technical content without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope of the technical solution of the utility model.

Claims

1. A brushless exciter cooling structure with a built-in centrifugal fan, characterized in that: include: An armature structure, comprising an armature winding (2) and an armature cylinder (1) coaxially arranged with a generator shaft, wherein one end of the armature cylinder (1) is closed and connected to the generator shaft, and the armature winding (2) is arranged on the cylinder wall of the armature cylinder (1); A stator structure, comprising an annular machine base (3) and an excitation winding (4), wherein an annular groove (31) is provided on one side of the annular machine base (3), wherein the annular groove (31) is nested in a cylinder wall at one end of the armature cylinder (1) and forms a gap with the cylinder wall of the armature cylinder (1), and the excitation winding (4) is arranged on the side wall of the annular groove (31) at a position corresponding to the armature winding (2); a centrifugal fan (5), the centrifugal fan (5) being arranged in the armature barrel (1) and connected to the closed end of the armature barrel (1), the centrifugal fan (5) being coaxial with the armature barrel (1); The space at the center of the annular base (3) forms a first air flow channel (61), and the gap between the cylinder wall of the armature cylinder (1) and the two side walls of the annular groove (31) respectively forms a second air flow channel (62) and a third air flow channel (63), the first air flow channel (61), the second air flow channel (62) and the third air flow channel (63) are connected in sequence, the centrifugal fan (5) is located at the end of the first air flow channel (61), the air inlet end of the centrifugal fan (5) is connected to the first air flow channel (61), and the air outlet end of the centrifugal fan (5) is connected to the second air flow channel (62).

2. A brushless exciter cooling structure with a built-in centrifugal fan according to claim 1, characterized in that: A wind shielding ring plate is provided between the end position of the first air flow channel (61) on the annular base (3) and the edge of the air inlet end of the centrifugal fan (5).

3. The brushless exciter cooling structure with a built-in centrifugal fan according to claim 1, characterized in that: It also comprises a shell (9), wherein the shell (9) encloses the armature structure and the stator structure, and the generator shaft passes through the shell (9) from the outside and is connected to the armature cylinder (1) in the shell (9).

4. The brushless exciter cooling structure with a built-in centrifugal fan according to claim 3, characterized in that: A gap is provided between the housing (9) and the annular base (3) to form a fourth air flow channel (64), and the fourth air flow channel (64) is connected to the third air flow channel (63) and the first air flow channel (61).

5. The cooling structure of a brushless exciter with a built-in centrifugal fan according to claim 4, characterized in that: A cooler (8) is provided in the fourth air flow passage (64).

6. The brushless exciter cooling structure with a built-in centrifugal fan according to claim 1, characterized in that: The armature winding (2) comprises an armature core (21) and an armature coil (22); the armature core (21) is arranged on the inner wall of the armature tube (1); and the armature coil (22) is wound around the armature core (21).

7. A brushless exciter cooling structure with a built-in centrifugal fan according to claim 6, characterized in that: The excitation winding (4) comprises an excitation core (41) and an excitation coil (42); the excitation core (41) is arranged on a side wall of the annular groove (31) close to the center of the annular base (3); the position of the excitation core (41) corresponds to the armature core (21); and the excitation coil (42) is wound around the excitation core (41).

8. The cooling structure of a brushless exciter with a built-in centrifugal fan according to claim 1, characterized in that: It also comprises a rectifier module (7), wherein the rectifier module (7) is arranged at one closed end inside the armature tube (1), and the rectifier module (7) is electrically connected to the armature winding (2).

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