Stator ventilation slot wedge structure and installation method thereof

Abstract

The invention discloses a stator ventilation slot wedge structure and an installation method thereof, and relates to the technical field of generator heat dissipation, in particular to a stator ventilation slot wedge structure and an installation method thereof.The stator ventilation slot wedge structure comprises a stator iron core and a ventilation slot wedge, the stator iron core is provided with teeth and slots, stator coils are arranged in the slots, and the ventilation slot wedge is arranged at a notch of the stator iron core; the pressing plate is used for pressing a stator coil. An air channel is arranged on the connecting surface of the ventilating slot wedge and the stator coil; the air channel comprises an axial air channel and a tangential air channel. The heat dissipation device has the advantages that the heat dissipation efficiency is remarkably improved, the air flow is optimized, the ventilation loss is reduced, heat dissipation is uniform, local overheating is prevented, adaptability is high, and economic benefits are improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat dissipation of generators, and in particular to a stator ventilation slot wedge structure and a mounting method thereof. Background Art

[0002] As the core equipment of power supply, the reliability and efficiency of the generator directly affect the stability and economy of the power system. During the operation of the generator, the stator coil will generate a lot of heat due to electromagnetic induction and current passing through. If this heat cannot be dissipated in time and effectively, the temperature of the stator coil will rise, which may accelerate the aging of the insulation material, affect the performance and life of the generator, and may even cause the generator to fail. Therefore, improving the heat dissipation efficiency of the stator coil is an important research direction in the field of generator technology.

[0003] Existing stator slot wedges are usually made of solid insulating material, and their main function is to compress and fix the stator coil to ensure that the coil does not loosen or shift during the operation of the motor.

[0004] However, this solid structure slot wedge has the following disadvantages:

[0005] 1. Limited heat dissipation capacity: Solid slot wedges are not designed with ventilation channels and cannot provide an effective air circulation path.

[0006] 2. Large wind resistance: Since the solid slot wedge blocks part of the airflow, the airflow generates greater resistance when passing through the stator slot, increasing the energy consumption of the ventilation system.

[0007] 3. Risk of local overheating: Solid slot wedges cannot ensure uniform heat dissipation of various parts of the stator coil. Especially under high load or long-term operation conditions, local overheating is prone to occur, affecting the overall performance of the generator.

[0008] In order to solve the above problems, the present application proposes a stator ventilation slot wedge with a ventilation structure, which significantly improves the heat dissipation efficiency of the stator coil and reduces ventilation loss by setting a reasonably designed air duct on the slot wedge. The stator ventilation slot wedge structure of the present application can effectively guide the airflow and increase the contact area between the stator coil and the air, thereby achieving a more efficient heat dissipation effect. Summary of the invention

[0009] The present invention aims to overcome the above-mentioned shortcomings of the prior art and provides a stator ventilation slot wedge structure and an installation method thereof.

[0010] The technical solution adopted by the present invention is as follows:

[0011] A stator ventilation slot wedge structure comprises: a stator core and a ventilation slot wedge, wherein the stator core is provided with teeth and slots, a stator coil is provided in the slot, and the ventilation slot wedge is provided at a slot opening of the stator core for pressing the stator coil;

[0012] An air duct is arranged on the interface between the ventilation slot wedge and the stator coil; the air duct comprises an axial air duct and a tangential air duct.

[0013] Furthermore, at least one axial air duct is provided along the axial direction of the stator.

[0014] Furthermore, the tangential air duct and the axial air duct are arranged to intersect vertically.

[0015] Furthermore, the tangential air duct depth is greater than the axial air duct depth.

[0016] Furthermore, the cross section of the tangential air duct is set as an arc-shaped air guide surface according to the rotation direction of the rotor.

[0017] Furthermore, the two tangential ends of the arc-shaped air guide surface are set at different heights, with a smooth arc transition.

[0018] Furthermore, the tangential air duct includes a plurality of tangential air ducts that are evenly spaced and arranged on the ventilation slot wedge.

[0019] Furthermore, the stator core slot is provided with a slide slot, and the ventilation slot wedge is slidably arranged in the stator core slot through the slide slot.

[0020] Furthermore, a method for installing a stator ventilation slot wedge structure comprises the following steps:

[0021] S1: Clean the stator core slots to ensure that no debris remains;

[0022] S2: Check whether the sliding groove of the ventilation slot wedge is intact to ensure smooth sliding;

[0023] S3: Align the ventilation slot wedge with the stator core slot, so that the sliding groove of the ventilation slot wedge is aligned with the sliding groove of the stator core slot;

[0024] S4: Gently push the ventilation slot wedge to slide along the slide slot until it completely enters the stator core slot;

[0025] S5: Check whether the ventilation slot wedge is installed in place to ensure close contact with the stator coil;

[0026] S6: Secure the installed ventilation slot wedges to prevent them from loosening or falling off.

[0027] Furthermore, in step S3, pay attention to the position of the air duct to ensure that the direction of the air duct is consistent with the design requirements; after the installation is completed, perform a ventilation test to check whether the air duct is unobstructed and free of blockage; perform an insulation test on the installed ventilation slot wedge to ensure that the insulation performance meets the requirements.

[0028] In summary, the stator ventilation slot wedge structure of the present application effectively improves the heat dissipation efficiency of the stator coil in the prior art through innovative design, and has the following beneficial effects:

[0029] 1. Significantly improve heat dissipation efficiency: The air duct design on the ventilation slot wedge, including axial air duct and tangential air duct, significantly increases the contact area between the stator coil and the air, and promotes the transfer and dissipation of heat. Compared with the traditional solid slot wedge, the heat dissipation capacity is significantly improved, which can effectively reduce the temperature of the stator coil and extend the service life of the generator.

[0030] 2. Optimize airflow and reduce ventilation loss: The layout and design of the air duct have been carefully optimized. The vertical intersection of the axial air duct and the tangential air duct helps to form a smooth airflow channel and reduce airflow resistance. The depth of the tangential air duct is greater than the depth of the axial air duct, and the cross-section is designed as an arc-shaped air guide surface according to the direction of rotor rotation, which further smoothes the airflow, reduces airflow impact and turbulence, thereby reducing ventilation losses and improving the efficiency of the generator.

[0031] 3. Uniform heat dissipation to prevent local overheating: Multiple tangential air ducts are evenly spaced and arranged on the ventilation slot wedges to ensure uniform heat dissipation of each part of the stator coil and avoid local overheating caused by uneven heat dissipation. This uniform heat dissipation design helps to improve the overall performance and reliability of the generator.

[0032] 4. Easy to install and maintain: The slide grooves set on the stator core slots allow the ventilation slot wedges to be slidably installed.

[0033] 5. Enhanced insulation performance: The material selection and structural design of the ventilation slot wedge fully consider the insulation performance, ensuring that while improving the heat dissipation efficiency, it will not affect the electrical safety of the generator.

[0034] 6. Strong adaptability: The stator ventilation slot wedge structure of the present application can be customized according to the heat dissipation requirements of different generators and has strong adaptability.

[0035] 7. Improve economic benefits: By improving heat dissipation efficiency and reducing ventilation losses, the stator ventilation slot wedge structure of the present application helps to improve the overall efficiency and reliability of the generator, reduce maintenance costs, and thus bring significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the structure of the ventilation slot wedge of the present invention;

[0038] Figure 3 is a top view of the ventilation slot wedge of the present invention;

[0039] Figure 4 It is a cross-sectional view of the ventilation slot wedge of the present invention.

[0040] Markings in the figure:

[0041] 1-ventilation slot wedge, 2-stator core, 3-stator coil, 4-axial air duct, 5-tangential air duct.

[0042] Specific Examples

[0043] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention 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 present invention and are not used to limit the present invention.

[0045] Embodiment 1

[0046] In this embodiment, if Figure 1 , 2 As shown, a stator ventilation slot wedge structure comprises: a stator core 2 and a ventilation slot wedge 1, wherein the stator core 2 is provided with teeth and slots, wherein a stator coil 3 is provided in the slot, and the ventilation slot wedge 1 is provided at the slot of the stator core 2 for pressing the stator coil 3;

[0047] An air duct is arranged at the interface between the ventilation slot wedge 1 and the stator coil 3 ; the air duct includes an axial air duct 4 and a tangential air duct 5 .

[0048] Specifically, the ventilation slot wedge 1 is set to be a long strip in accordance with the shape of the slot of the stator core 2, and is used to compress the centering coil arranged in the slot. An air duct is set on the side close to the stator coil 3, and is used to drive air to flow in the air duct when the rotor rotates to take away heat.

[0049] The contact surface between the ventilation slot wedge 1 and the stator coil 3 is provided with air ducts, including an axial air duct 4 and a tangential air duct 5. This design significantly increases the contact area between the stator coil 3 and the air, and improves the heat dissipation efficiency.

[0050] Furthermore, at least one axial air duct 4 is provided along the axial direction of the stator.

[0051] In this embodiment, the axial air duct 4 is provided as one, which runs through the ventilation slot wedge 1 from beginning to end.

[0052] Increasing the number of axial air ducts 4 helps to enhance the ventilation effect and further improve the heat dissipation capacity. Multiple axial air ducts 4 can more effectively guide the airflow, reduce airflow resistance, and reduce ventilation losses.

[0053] Furthermore, the tangential air duct 5 is arranged to intersect the axial air duct 4 perpendicularly.

[0054] The tangential air duct 5 is arranged to intersect vertically with the axial air duct 4. The design of the tangential air duct 5 helps to form a smoother air flow channel and reduce air flow impact and turbulence.

[0055] This design reduces ventilation losses and improves the overall efficiency of the generator.

[0056] Furthermore, the depth of the tangential air duct 5 is greater than the depth of the axial air duct 4 .

[0057] The depth of the tangential air duct 5 is greater than the depth of the axial air duct 4. The deeper tangential air duct 5 can provide a larger ventilation space and enhance the heat dissipation effect.

[0058] The depth difference helps to optimize the air flow distribution and ensure uniform heat dissipation of each part of the stator coil 3.

[0059] Furthermore, the cross section of the tangential air duct 5 is configured as an arc-shaped air guiding surface according to the rotation direction of the rotor.

[0060] The cross section of the tangential air duct 5 is set as an arc-shaped air guide surface according to the rotation direction of the rotor. The arc-shaped air guide surface can smoothly guide the airflow and reduce airflow resistance and turbulence.

[0061] This design further reduces ventilation losses and improves generator efficiency.

[0062] Furthermore, the two tangential ends of the arc-shaped air guide surface are set at different heights, with a smooth arc transition.

[0063] The two ends of the curved air guide surface are set at different heights, and the transition is made through a smooth arc. The settings of different heights can better adapt to the airflow characteristics and optimize the airflow distribution. Specifically, the air inlet has a larger depth at one end, which can maximize the air intake, and then guide the air to the narrower end through the curved air duct, which can increase the air flow rate and improve the heat dissipation efficiency.

[0064] The smooth arc transition reduces airflow impact and reduces ventilation loss.

[0065] Furthermore, the tangential air ducts 5 include a plurality of tangential air ducts 5 that are evenly spaced and arranged on the ventilation slot wedge 1 .

[0066] The tangential air ducts 5 include a plurality of tangential air ducts 5 that are evenly spaced and arranged on the ventilation slot wedge 1. The plurality of tangential air ducts 5 help to ensure uniform heat dissipation of each part of the stator coil 3 and avoid local overheating.

[0067] The uniform heat dissipation design improves the overall performance and reliability of the generator.

[0068] Furthermore, the slot of the stator core 2 is provided with a slide groove, and the ventilation slot wedge 1 is slidably arranged in the slot of the stator core 2 through the slide groove.

[0069] The slot of the stator core 2 is provided with a slide slot, and the ventilation slot wedge 1 is slidably arranged in the slot of the stator core 2 through the slide slot. The slide slot design facilitates the installation and removal of the ventilation slot wedge 1 and improves the installation and maintenance efficiency.

[0070] This design reduces maintenance costs and facilitates daily maintenance and replacement.

[0071] Embodiment 2

[0072] Based on the first embodiment, a method for installing a stator ventilation slot wedge structure is provided, comprising the following steps:

[0073] S1: Clean the slot 2 of the stator core to ensure that no debris remains;

[0074] S2: Check whether the sliding groove of the ventilation slot wedge 1 is intact to ensure smooth sliding;

[0075] S3: Align the ventilation slot wedge 1 with the slot of the stator core 2 so that the slide groove of the ventilation slot wedge 1 is aligned with the slide groove of the slot of the stator core 2;

[0076] S4: Gently push the ventilation slot wedge 1 to slide along the slide slot until it completely enters the slot of the stator core 2;

[0077] S5: Check whether the ventilation slot wedge 1 is installed in place to ensure close contact with the stator coil 3;

[0078] S6: Fix the installed ventilation slot wedge 1 to prevent it from loosening or falling off.

[0079] The method comprises the steps of cleaning the notch of the stator core 2, checking the sliding slot of the ventilation slot wedge 1, aligning and sliding the installation, checking that the installation is in place and fixing the installation.

[0080] This installation method ensures that the ventilation slot wedge 1 can be correctly installed in place, ensuring the installation quality and safety.

[0081] Furthermore, in step S3, pay attention to the position of the air duct to ensure that the direction of the air duct is consistent with the design requirements; after the installation is completed, perform a ventilation test to check whether the air duct is unobstructed and free of blockage; perform an insulation test on the installed ventilation slot wedge 1 to ensure that the insulation performance meets the requirements.

[0082] During the installation process, pay attention to the position of the air duct to ensure that the direction of the air duct is consistent with the design requirements. The opening at the air inlet end is required to be larger to ensure the air intake. After the installation is completed, conduct ventilation test and insulation test to ensure that the air duct is unobstructed and the insulation performance meets the requirements.

[0083] These steps further ensure the quality of the installation and the electrical safety of the generator.

[0084] The above description is only a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention should be included in the protection scope of the invention.

Claims

1. A stator ventilation slot wedge structure, characterized in that: include: A stator core (2) and a ventilation slot wedge (1), wherein the stator core (2) is provided with teeth and slots, a stator coil (3) is provided in the slots, and the ventilation slot wedge (1) is provided at the slot opening of the stator core (2) for pressing the stator coil (3); An air duct is provided on the interface between the ventilation slot wedge (1) and the stator coil (3); the air duct comprises an axial air duct (4) and a tangential air duct (5).

2. A stator ventilation slot wedge structure according to claim 1, characterized in that: At least one axial air duct (4) is arranged along the axial direction of the stator.

3. A stator ventilation slot wedge structure according to claim 1, characterized in that: The tangential air duct (5) is arranged to intersect the axial air duct (4) perpendicularly.

4. A stator ventilation slot wedge structure according to claim 1, characterized in that: The depth of the tangential air duct (5) is greater than the depth of the axial air duct (4).

5. A stator ventilation slot wedge structure according to claim 1, characterized in that: The cross section of the tangential air duct (5) is arranged as an arc-shaped air guiding surface according to the rotation direction of the rotor.

6. A stator ventilation slot wedge structure according to claim 5, characterized in that: The two tangential ends of the arc-shaped air guiding surface are set at different heights and transition through a smooth arc.

7. A stator ventilation slot wedge structure according to claim 1, characterized in that: The tangential air ducts (5) include a plurality of tangential air ducts (5) which are evenly spaced and arranged on the ventilation slot wedge (1).

8. The stator ventilation slot wedge structure according to claim 1, characterized in that: The slot of the stator core (2) is provided with a sliding groove, and the ventilation slot wedge (1) is slidably arranged in the slot of the stator core (2) through the sliding groove.

9. A method for installing a stator ventilation slot wedge structure, applied to a stator ventilation slot wedge structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Clean the slots of the stator core (2) to ensure that no debris remains; S2: Check whether the sliding groove of the ventilation slot wedge (1) is intact and ensure that it can slide smoothly; S3: Align the ventilation slot wedge (1) with the slot opening of the stator core (2), so that the slide groove of the ventilation slot wedge (1) is aligned with the slide groove of the slot opening of the stator core (2); S4: Gently push the ventilation slot wedge (1) to slide along the slide slot until it completely enters the slot of the stator core (2); S5: Check whether the ventilation slot wedge (1) is installed in place and ensure that it is in close contact with the stator coil (3); S6: Secure the installed ventilation slot wedge (1) to prevent it from loosening or falling off.

10. The method for installing a stator ventilation slot wedge structure according to claim 9, characterized in that: In step S3, pay attention to the position of the air duct to ensure that the direction of the air duct is consistent with the design requirements; after installation, perform a ventilation test to check whether the air duct is unobstructed and unblocked; and perform an insulation test on the installed ventilation slot wedge (1) to ensure that the insulation performance meets the requirements.

Images