Ventilation cooling structure of brushless exciter

Abstract

The utility model relates to the technical field of motor structures, in particular to a ventilation cooling structure of a brushless exciter, which comprises a wind scooper and a centrifugal fan. An air inlet channel and an air outlet channel which are communicated with the main motor are arranged in the air guide cover; the wind scooper is installed on the top of the exciter shell, an air inlet channel of the wind scooper is communicated with one side of the exciter rotor, and an air outlet channel of the wind scooper is communicated with the other side of the exciter rotor. Ventilation structures are arranged on the rotor pressing plates on the two axial sides of the exciter rotor; the centrifugal fan is installed in the exciter housing and close to the air outlet of the wind scooper. Compared with the prior art, the technical scheme has the advantages that the structure is simplified, specifications of materials required by ventilation are reduced, a ventilation air path is shorter, and air resistance is smaller; the arrangement of the centrifugal fan can quickly drive the exciter to exchange cold and heat with the main motor, and the cooling effect of the exciter is better.

Description

Technical Field

[0001] The utility model relates to the technical field of motor structure, in particular to a ventilation and cooling structure of a brushless exciter. Background Art

[0002] The brushless exciter is composed of a stator, a rotor, a rectifier, a base, etc. Considering the convenience of lifting the main motor and the exciter as a whole, the exciter base and the main motor base are usually designed as an integral base. The interior of the base is designed with a special structure, and the induced draft duct is used to transport the cold air of the main motor to the inside of the exciter housing to cool the stator, rotor and power devices of the exciter. After cooling, the hot air is transported to the inside of the main motor through the air supply duct. The main motor base is provided with a closed cavity and an induced draft vent and an exhaust vent. The exciter air inlet and outlet are provided at the bottom of the exciter base. The aforementioned air vents are connected by welded steel pipes and 90° welded elbows. The cold air of the main motor enters the inside of the exciter housing through the exciter air inlet to cool the exciter, and then is discharged to the inside of the main motor through the air outlet to achieve cooling and heat dissipation of the exciter.

[0003] The above existing cooling scheme has a complex overall base structure, a long cooling air path, a low wind pressure inside the exciter housing, and the rectifier disc is not fully cooled, resulting in a poor cooling effect. Summary of the invention

[0004] The purpose of the utility model is to address the deficiencies of the above-mentioned prior art and propose a ventilation cooling structure for a brushless exciter, which is specifically as follows:

[0005] A brushless exciter ventilation and cooling structure includes an air duct and a centrifugal fan. The air duct is a hollow columnar structure, one end of which is open and the other end is sealed; a diverter plate is arranged inside the air duct along the length direction, and the diverter plate divides the inside of the air duct into an air inlet channel and an air outlet channel; an air inlet is provided at the bottom of the air inlet channel, and an air outlet is provided at the bottom of the air outlet channel. The air duct is installed on the top of the exciter housing, and its air inlet and air outlet are respectively sealed and connected to the exciter housing, and the air inlet is connected to one side of the exciter rotor, and the air outlet is connected to the other side of the exciter rotor; the open end of the air duct is sealed and connected to the end cover of the main motor, and a vent is provided on the end cover of the main motor corresponding to the open structure of the air duct. The rotor pressure plate facing the main motor inside the exciter housing is the first pressure plate, and the rotor pressure plate facing the rectifier disk is the second pressure plate, and ventilation structures are respectively provided on the first pressure plate and the second pressure plate. The centrifugal fan is installed inside the exciter housing near the air outlet of the air guide cover.

[0006] Preferably, the diverter plate passes through the vent on the end cover of the main motor and extends to the interior of the main motor.

[0007] Preferably, sponge rubber pads are respectively provided between the mating surfaces of the air guide cover and the end cover of the main motor, and between the mating surfaces of the air guide cover and the exciter housing.

[0008] Preferably, the side of the exciter rotor conductively connected to the air inlet of the air scoop is the side facing the main motor, and the side of the exciter rotor conductively connected to the air outlet of the air scoop is the side facing the rectifier disk.

[0009] Preferably, the ventilation structure comprises a plurality of ventilation holes arranged at intervals in the circumferential direction around the center point of the rotor pressure plate.

[0010] Preferably, the number of ventilation holes on the first pressing plate is greater than the number of ventilation holes on the second pressing plate.

[0011] Preferably, all ventilation holes on the second pressing plate are aligned one by one with the same number of ventilation holes on the first pressing plate.

[0012] Preferably, the ventilation holes on the second pressing plate face the heat sink of the rectifier disc inside the exciter housing.

[0013] Beneficial technical effects brought by the utility model:

[0014] 1) This technical solution proposes a brushless exciter ventilation and cooling structure, which realizes air circulation by adding an air guide cover and a centrifugal fan to the brushless exciter to achieve the purpose of heat exchange between the exciter and the main motor. Among them, the air guide cover is a columnar cavity structure with an air inlet channel and an air outlet channel inside, and it also undertakes the functions of air induction and exhaust. Compared with the existing technology, the structure is simplified, the material specifications required for simple ventilation are reduced, and the ventilation air path is shorter and the wind resistance is smaller; the setting of the centrifugal fan can quickly drive the exciter and the main motor to exchange heat, and the exciter has a better cooling effect.

[0015] 2) The special ventilation structure design on the rotor pressure plate ensures that the exciter rotor can be fully cooled, while taking into account the cooling of the power devices on the rectifier disk, which makes the exciter cooling effect better and the equipment safer.

[0016] 3) A centrifugal fan is installed outside the rectifier disk inside the exciter to quickly drive the exciter and the main motor to exchange heat and cold, which improves the cooling effect of the exciter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the overall structural diagram of the ventilation and cooling structure of the brushless exciter;

[0018] Figure 2 It is a schematic diagram of the perspective structure of the air guide cover from above;

[0019] Figure 3 is a structural schematic diagram of the first pressing plate;

[0020] Figure 4 It is a schematic diagram of the structure of the second pressing plate.

[0021] In the figure:

[0022] 1. Wind guide cover; 2. Centrifugal fan; 3. Diverter plate; 4. Air inlet channel; 5. Air outlet channel; 6. Air inlet; 7. Air outlet; 8. Exciter housing; 9. Main motor; 10. End cover; 11. Ventilation port; 12. First pressure plate; 13. Second pressure plate; 14. Sponge rubber pad; 15. Rectifier disc; 16. Ventilation hole; 17. Heat sink; 18. Exciter rotor; 19. Exciter stator. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments.

[0024] Therefore, the following detailed description of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] This embodiment discloses a brushless exciter ventilation cooling structure as a preferred embodiment of the utility model. Figure 1 As shown, it includes an air guide cover 1 and a centrifugal fan 2.

[0027] The air guide cover 1 is a columnar structure with a hollow interior, such as an air guide cover 1 that can be welded with steel plates into a rectangular structure. One end of the air guide cover 1 (in the length direction) is open, and the other end is sealed. A splitter plate 3 is arranged inside the air guide cover 1 along the length direction, and the splitter plate 3 divides the interior of the air guide cover 1 into an air inlet channel 4 and an air outlet channel 5; an air inlet 6 is provided at the bottom of the air inlet channel 4, and an air outlet 7 is provided at the bottom of the air outlet channel 5. The bottom of the air inlet channel 4 and the bottom of the air outlet channel 5 are both side surfaces of the air guide cover 1, which are perpendicular to the open end surface and the sealed end surface.

[0028] The air guide hood 1 is installed on the top of the exciter housing 8, and its air inlet 6 and air outlet 7 are respectively sealed and connected to the exciter housing 8, and the air inlet 6 is conductively connected to one side (air inlet side) of the exciter rotor 18, and the air outlet 7 is conductively connected to the other side (air outlet side) of the exciter rotor 18; the open end of the air guide hood 1 is sealed and connected to the end cover 10 of the main motor 9, and a vent 11 is provided on the end cover 10 of the main motor 9 corresponding to the open structure of the air guide hood 1, so that the air guide hood 1 is sealed and conductive to the internal environment of the main motor 9.

[0029] The rotor pressure plate facing the main motor 9 inside the exciter housing 8 is the first pressure plate 12 , and the rotor pressure plate facing the rectifier disk 15 is the second pressure plate 13 . The first pressure plate 12 and the second pressure plate 13 are respectively provided with ventilation structures.

[0030] The centrifugal fan 2 is installed inside the exciter housing 8 near the air outlet 7 of the air guide cover 1 .

[0031] Based on the above structure, the working principle of the technical solution is as follows: during the operation of the centrifugal fan 2, the air in the outlet side of the exciter housing 8 enters the main motor 9 from the air outlet 7 through the air outlet channel 5, so that a pressure difference is generated between the air outlet side and the air inlet side, and the air on the air inlet side passes through the ventilation structure on the first pressing plate 12, the exciter rotor 18 and the ventilation structure on the second pressing plate 13 to enter the air outlet side in turn, and at the same time, the cold air inside the main motor 9 enters the air inlet side inside the exciter housing 8 through the air inlet channel 4. It can be seen that the centrifugal fan 2 shell can drive the exciter and the main motor 9 to quickly exchange heat by accelerating the air circulation speed. Based on the above principle, the cold air inside the main motor 9 enters the air inlet side inside the exciter housing 8 through the air inlet 6 of the air inlet channel 4 of the air guide cover 1, enters the exciter rotor 18 through the ventilation structure on the first pressing plate 12 to cool it, and then enters the air outlet 7 through the ventilation structure on the second pressing plate 13, and is discharged from the main motor 9 from the centrifugal fan 2 to the air outlet channel 5. When the cold air circulates inside the exciter housing 8 , it also takes away the heat generated by the power devices inside the exciter housing 8 .

[0032] Example 2

[0033] This embodiment discloses a brushless exciter ventilation cooling structure as a preferred embodiment of the utility model. Figure 1 As shown, it includes an air guide cover 1 and a centrifugal fan 2.

[0034] The air guide cover 1 is a hollow columnar structure, one end of which is open and the other end is sealed; a splitter plate 3 is arranged inside the air guide cover 1 along the length direction, and the splitter plate 3 divides the inside of the air guide cover 1 into an air inlet channel 4 and an air outlet channel 5; an air inlet 6 is provided at the bottom of the air inlet channel 4, and an air outlet 7 is provided at the bottom of the air outlet channel 5;

[0035] The air guide hood 1 is installed on the top of the exciter housing 8, and its air inlet 6 and air outlet 7 are respectively sealed and connected to the exciter housing 8, and the air inlet 6 is conductively connected to one side of the exciter rotor 18, and the air outlet 7 is conductively connected to the other side of the exciter rotor 18; the open end of the air guide hood 1 is sealed and connected to the end cover 10 of the main motor 9, and a ventilation hole 11 is opened on the end cover 10 of the main motor 9 corresponding to the open structure of the air guide hood 1.

[0036] The rotor pressure plate facing the main motor 9 inside the exciter housing 8 is the first pressure plate 12 , and the rotor pressure plate facing the rectifier disk 15 is the second pressure plate 13 . The first pressure plate 12 and the second pressure plate 13 are respectively provided with ventilation structures.

[0037] The centrifugal fan 2 is installed inside the exciter housing 8 near the air outlet 7 of the air guide cover 1 .

[0038] Furthermore, the diverter plate 3 passes through the vent 11 on the end cover 10 of the main motor 9 and extends to the interior of the main motor 9, separating the inlet and outlet air paths inside the main motor 9, thereby avoiding the collision of cold air and hot air to the greatest extent and ensuring that cold air can enter smoothly and hot air can be discharged smoothly.

[0039] Furthermore, sponge rubber pads 14 are provided between the mating surfaces of the air guide cover 1 and the end cover 10 of the main motor 9, and between the mating surfaces of the air guide cover 1 and the exciter housing 8, respectively, to isolate the mechanical noise generated by the rotating parts inside the main motor 9 and the exciter housing 8.

[0040] Example 3

[0041] This embodiment discloses a brushless exciter ventilation cooling structure as a preferred embodiment of the utility model. Figure 1 As shown, it includes an air guide cover 1 and a centrifugal fan 2.

[0042] The air guide cover 1 is a hollow columnar structure, one end of which is open and the other end is sealed; a splitter plate 3 is arranged inside the air guide cover 1 along the length direction, and the splitter plate 3 divides the inside of the air guide cover 1 into an air inlet channel 4 and an air outlet channel 5; an air inlet 6 is provided at the bottom of the air inlet channel 4, and an air outlet 7 is provided at the bottom of the air outlet channel 5;

[0043] The air guide hood 1 is installed on the top of the exciter housing 8, and its air inlet 6 and air outlet 7 are respectively sealed and connected to the exciter housing 8, and the air inlet 6 is conductively connected to one side of the exciter rotor 18, and the air outlet 7 is conductively connected to the other side of the exciter rotor 18; the open end of the air guide hood 1 is sealed and connected to the end cover 10 of the main motor 9, and a ventilation hole 11 is opened on the end cover 10 of the main motor 9 corresponding to the open structure of the air guide hood 1.

[0044] The rotor pressure plate facing the main motor 9 inside the exciter housing 8 is the first pressure plate 12 , and the rotor pressure plate facing the rectifier disk 15 is the second pressure plate 13 . The first pressure plate 12 and the second pressure plate 13 are respectively provided with ventilation structures.

[0045] The centrifugal fan 2 is installed inside the exciter housing 8 near the air outlet 7 of the air guide cover 1 .

[0046] Furthermore, the side of the exciter rotor 18 connected to the air inlet channel 4 of the air guide cover 1 is the side facing the main motor 9, and the side of the exciter rotor 18 connected to the air outlet channel 5 of the air guide cover 1 is the side facing the rectifier disk 15.

[0047] Power devices are arranged on the rectifier disk 15. Based on the above mechanism, the technical solution limits the flow direction of cold air inside the exciter housing 8. Specifically, the cold air first takes away the heat on the exciter rotor 18, and takes away the heat generated by the power devices when passing through the heat sink 17 of the rectifier disk 15. In this way, it can be prevented that the air brings the heat generated by the power devices into the exciter rotor 18, affecting the heat exchange effect inside the exciter rotor 18, and improves the heat dissipation effect to a certain extent.

[0048] Example 4

[0049] This embodiment discloses a brushless exciter ventilation cooling structure as a preferred embodiment of the utility model. Figure 1 As shown, it includes an air guide cover 1 and a centrifugal fan 2.

[0050] The air guide cover 1 is a hollow columnar structure, one end of which is open and the other end is sealed; a splitter plate 3 is arranged inside the air guide cover 1 along the length direction, and the splitter plate 3 divides the inside of the air guide cover 1 into an air inlet channel 4 and an air outlet channel 5; an air inlet 6 is provided at the bottom of the air inlet channel 4, and an air outlet 7 is provided at the bottom of the air outlet channel 5;

[0051] The air guide hood 1 is installed on the top of the exciter housing 8, and its air inlet 6 and air outlet 7 are respectively sealed and connected to the exciter housing 8, and the air inlet 6 is conductively connected to one side of the exciter rotor 18, and the air outlet 7 is conductively connected to the other side of the exciter rotor 18; the open end of the air guide hood 1 is sealed and connected to the end cover 10 of the main motor 9, and a ventilation hole 11 is opened on the end cover 10 of the main motor 9 corresponding to the open structure of the air guide hood 1.

[0052] The rotor pressure plate facing the main motor 9 inside the exciter housing 8 is the first pressure plate 12 , and the rotor pressure plate facing the rectifier disk 15 is the second pressure plate 13 . The first pressure plate 12 and the second pressure plate 13 are respectively provided with ventilation structures.

[0053] The centrifugal fan 2 is installed inside the exciter housing 8 near the air outlet 7 of the air guide cover 1 .

[0054] Furthermore, according to the disc-shaped structure of the rotor pressure plate, the ventilation structure includes a plurality of ventilation holes 16 circumferentially spaced around the center point of the rotor pressure plate, so that air can flow evenly. Furthermore, all the ventilation holes 16 are arranged at equal intervals.

[0055] Furthermore, the number of ventilation holes 16 on the first pressing plate 12 is greater than the number of ventilation holes 16 on the second pressing plate 13 , so as to increase the residence time of cold air inside the exciter rotor 18 , thereby improving the heat dissipation effect of the exciter rotor 18 to a certain extent.

[0056] Example 5

[0057] This embodiment discloses a brushless exciter ventilation cooling structure as a preferred embodiment of the utility model. Figure 1 As shown, it includes an air guide cover 1 and a centrifugal fan 2.

[0058] The air guide cover 1 is a hollow columnar structure, one end of which is open and the other end is sealed; a splitter plate 3 is arranged inside the air guide cover 1 along the length direction, and the splitter plate 3 divides the inside of the air guide cover 1 into an air inlet channel 4 and an air outlet channel 5; an air inlet 6 is provided at the bottom of the air inlet channel 4, and an air outlet 7 is provided at the bottom of the air outlet channel 5;

[0059] The air guide hood 1 is installed on the top of the exciter housing 8, and its air inlet 6 and air outlet 7 are respectively sealed and connected to the exciter housing 8, and the air inlet 6 is conductively connected to one side of the exciter rotor 18, and the air outlet 7 is conductively connected to the other side of the exciter rotor 18; the open end of the air guide hood 1 is sealed and connected to the end cover 10 of the main motor 9, and a ventilation hole 11 is opened on the end cover 10 of the main motor 9 corresponding to the open structure of the air guide hood 1.

[0060] The rotor pressure plate facing the main motor 9 inside the exciter housing 8 is the first pressure plate 12 , and the rotor pressure plate facing the rectifier disk 15 is the second pressure plate 13 . The first pressure plate 12 and the second pressure plate 13 are respectively provided with ventilation structures.

[0061] The centrifugal fan 2 is installed inside the exciter housing 8 near the air outlet 7 of the air guide cover 1 .

[0062] Furthermore, the side of the exciter rotor 18 that is conductively connected to the air inlet 6 of the air guide cover 1 is the side facing the main motor 9 , and the side of the exciter rotor 18 that is conductively connected to the air outlet 7 of the air guide cover 1 is the side facing the rectifier disk 15 .

[0063] Furthermore, the ventilation structure includes a plurality of ventilation holes 16 arranged at intervals in the circumferential direction around the center point of the rotor pressure plate, and the number of ventilation holes 16 on the first pressure plate 12 is greater than the number of ventilation holes 16 on the second pressure plate 13. Furthermore, let the number of ventilation holes 16 on the second pressure plate 13 be n, and the number of ventilation holes 16 on the first pressure plate 12 be 2n, so that n ventilation holes 16 are arranged at equal intervals in the circumferential direction on the second pressure plate 13, and 2n ventilation holes 16 are arranged at equal intervals in the circumferential direction on the first pressure plate 12. In this technical solution, n can be 6, 8 or 10.

[0064] Furthermore, all the ventilation holes 16 on the second pressing plate 13 are aligned one by one with the same number of ventilation holes 16 on the first pressing plate 12. For example, n equally spaced ventilation holes 16 on the first pressing plate 12 are aligned one by one with n ventilation holes 16 on the second pressing plate 13. In this way, a part of the cold air enters the exciter rotor 18 and the exciter stator 19, and participates in the heat exchange inside the exciter rotor 18 and the exciter stator 19; another part of the cold air directly passes through the first pressing plate 12 and the second pressing plate 13, and participates in the heat exchange of each power device.

[0065] Furthermore, the ventilation holes 16 on the second pressing plate 13 face the heat sink 17 of the rectifier disk 15 inside the exciter housing 8, and accurately participate in the heat exchange of each power device.

Claims

1. A brushless exciter ventilation cooling structure, characterized in that: It comprises an air guide cover (1) and a centrifugal fan (2); The air guide cover (1) is in the form of a columnar structure with a hollow interior, one end of which is open and the other end of which is sealed; a flow divider (3) is provided inside the air guide cover (1) along the length direction, and the flow divider (3) divides the interior of the air guide cover (1) into an air inlet channel (4) and an air outlet channel (5); an air inlet (6) is provided at the bottom of the air inlet channel (4), and an air outlet (7) is provided at the bottom of the air outlet channel (5); The air guide cover (1) is installed on the top of the exciter housing (8), and its air inlet (6) and air outlet (7) are respectively sealed and connected to the exciter housing (8), and the air inlet (6) is conductively connected to one side of the exciter rotor (18), and the air outlet (7) is conductively connected to the other side of the exciter rotor (18); the open end of the air guide cover (1) is sealed and connected to the end cover (10) of the main motor (9), and a vent (11) is provided on the end cover (10) of the main motor (9) corresponding to the open structure of the air guide cover (1); The rotor pressure plate facing the main motor (9) inside the exciter housing (8) is a first pressure plate (12), and the rotor pressure plate facing the rectifier disk (15) is a second pressure plate (13), and ventilation structures are respectively provided on the first pressure plate (12) and the second pressure plate (13); The centrifugal fan (2) is installed inside the exciter housing (8) at a position close to the air outlet (7) of the air guide cover (1).

2. A brushless exciter ventilation cooling structure as claimed in claim 1, characterized in that: The diverter plate (3) passes through a vent (11) on an end cover (10) of the main motor (9) and extends into the interior of the main motor (9).

3. A brushless exciter ventilation cooling structure as claimed in claim 1, characterized in that: Sponge rubber pads (14) are provided between the mating surfaces of the air guide cover (1) and the end cover (10) of the main motor (9), and between the mating surfaces of the air guide cover (1) and the exciter housing (8).

4. A brushless exciter ventilation cooling structure as claimed in claim 1, characterized in that: The side of the exciter rotor (18) that is conductively connected to the air inlet (6) of the air guide cover (1) is the side facing the main motor (9), and the side of the exciter rotor (18) that is conductively connected to the air outlet (7) of the air guide cover (1) is the side facing the rectifier disk (15).

5. A brushless exciter ventilation cooling structure as claimed in claim 1, characterized in that: The ventilation structure comprises a plurality of ventilation holes (16) arranged at circumferential intervals around the center point of the rotor pressure plate.

6. A brushless exciter ventilation cooling structure as claimed in claim 5, characterized in that: The number of ventilation holes (16) on the first pressing plate (12) is greater than the number of ventilation holes (16) on the second pressing plate (13).

7. A brushless exciter ventilation cooling structure as claimed in claim 6, characterized in that: All ventilation holes (16) on the second pressing plate (13) are aligned one by one with the same number of ventilation holes (16) on the first pressing plate (12).

8. A brushless exciter ventilation cooling structure as claimed in claim 5, characterized in that: The ventilation hole (16) on the second pressure plate (13) faces the heat sink (17) of the rectifier disk (15) inside the exciter housing (8).

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