Reinforced heat dissipation structure of main generator rotor of aviation high-speed variable-frequency oil-cooled generator

Abstract

The utility model belongs to the field of aero-generator design, and particularly relates to a reinforced heat dissipation structure of a main generator rotor of an aero-high-speed variable-frequency oil-cooled generator. The structure comprises a rotor iron core (1) which is divided into two sections along the axial direction, an oil path punching sheet (2) is arranged between the two sections of rotor iron cores (1), a hollow rotating disc (21) of the oil path punching sheet (2) is provided with a plurality of strip-shaped grooves (24), and each strip-shaped groove (24) extends along the radial direction of the hollow rotating disc (21) and is communicated with a through hole in the middle of the hollow rotating disc (21) and a gap (23) outside the hollow rotating disc (21). The oil path punching sheets (2) and the rotor iron core (1) are jointly sleeved on the hollow shaft, and a plurality of oil spraying holes are formed in the positions, where the oil path punching sheets (2) are installed, of the hollow shaft in the circumferential direction so as to spray cooling oil in the hollow shaft to the oil path punching sheets (2). Heat dissipation of the main generator rotor is improved, and temperature rise of the excitation winding is effectively reduced.

Description

Technical Field

[0001] This application belongs to the field of aviation generator design, and particularly relates to a main generator rotor enhanced heat dissipation structure for an aviation high-speed variable-frequency oil-cooled generator. Background Art

[0002] The heat generated by a typical aviation three-stage oil-cooled generator main generator rotor includes the iron loss of the main generator iron core and the copper loss of the excitation winding. The heat is removed by means of rotor oil injection cooling, that is, spray holes are opened at positions on the hollow shaft corresponding to the ends of the main generator rotor winding. When the rotor rotates at a high speed, the coolant sprays out from the spray holes at a high speed, flushes the end windings and takes away the heat generated by the windings, achieving the purpose of cooling the windings.

[0003] With the increase in speed, the current aviation three-stage high-speed variable-frequency AC generator has a capacity of 90 / 120 kVA, a working speed range of (10800 - 25080) r / min, and a frequency range of (360 - 800) Hz. The heat dissipation of the main generator rotor by relying on the above-mentioned method of passing cooling oil through the hollow shaft and spraying it radially from the spray holes towards the end windings at both ends can no longer meet the heat dissipation requirements. Limited by the speed and frequency, the main generator iron core can only be designed as two pairs of poles, and the main generator excitation winding is evenly distributed on the four pole bodies of the iron core. The winding wire package is bulky and has a long axial length. The temperature at the middle part of the winding in the axial direction reaches the maximum value, forming a local high-temperature point, which is extremely likely to cause the winding insulation to exceed the limit temperature and burn out. Content of the Utility Model

[0004] In order to solve the above problems, this application provides a main generator rotor enhanced heat dissipation structure for an aviation high-speed variable-frequency oil-cooled generator, which includes a rotor iron core axially divided into two sections. An oil passage punching sheet is arranged between the two sections of the rotor iron core. The oil passage punching sheet includes a hollow turntable that fits with the yoke of the rotor iron core. A plurality of T-shaped plates that fit with the magnetic poles of the rotor iron core protrude radially outward from the outer periphery of the hollow turntable. A gap for winding the excitation winding is formed between adjacent T-shaped plates. At least one of the front and back surfaces of the hollow turntable is provided with a plurality of strip-shaped grooves. Each strip-shaped groove extends radially along the hollow turntable and communicates the through hole in the middle of the hollow turntable with the gap outside the hollow turntable. The oil passage punching sheet and the rotor iron core are jointly sleeved on the hollow shaft. A plurality of oil injection holes are arranged circumferentially at the position where the hollow shaft installs the oil passage punching sheet to spray the cooling oil in the hollow shaft towards the oil passage punching sheet.

[0005] Preferably, 8 strip-shaped grooves are evenly distributed circumferentially on the surface of the hollow turntable.

[0006] Preferably, one end of the strip-shaped groove connecting the gap is close to the root of the T-shaped plate.

[0007] Preferably, a plurality of weight-reducing holes are arranged on the hollow turntable.

[0008] Preferably, the weight-reducing holes are round holes.

[0009] Preferably, the oil circuit punching sheet is processed into an integral structure from a 30CrMnSiA bar.

[0010] Preferably, the outer diameter of the hollow turntable is smaller than the outer diameter of the yoke of the rotor core, so that when the hollow turntable fits the yoke of the rotor core, a step is formed between the outer surface of the hollow turntable and the outer surface of the yoke, and the step forms an arc-shaped groove for guiding the cooling oil at the end of the strip-shaped groove to flow to the center of the gap.

[0011] Preferably, the outer surface of the yoke of the rotor core has an axial groove extending along the axial direction of the rotor core. One end of the axial groove is connected to the strip-shaped groove, and the other end is located at the axial end of the rotor core.

[0012] This application improves the heat dissipation of the main generator rotor and effectively reduces the temperature rise of the excitation winding. Description of the Drawings

[0013] Figure 1 is an installation schematic diagram of a preferred embodiment of the enhanced heat dissipation structure of the main generator rotor of the aviation high-speed variable-frequency oil-cooled generator of this application.

[0014] Figure 2 This is an application Figure 1 Schematic diagram of the docking oil circuit punching sheet of the main generator rotor of the illustrated embodiment.

[0015] Wherein, 1 - rotor core, 2 - oil circuit punching sheet, 21 - hollow turntable, 22 - T-shaped plate, 23 - gap, 24 - strip-shaped groove, 25 - weight-reducing hole, 26 - arc-shaped groove, 27 - axial groove. Detailed Embodiments

[0016] To make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the drawings in the embodiments of this application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The described embodiments are some but not all of the embodiments of this application. The embodiments described below with reference to the drawings are exemplary and are intended to explain this application and should not be construed as limiting this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the drawings.

[0017] This application provides an enhanced heat dissipation structure for the main generator rotor of an aviation high-speed variable-frequency oil-cooled generator to improve the heat dissipation of the main generator rotor, asFigure 1 As shown, the rotor core 1 of the main generator is axially symmetrically cut into two sections, and an oil passage punching plate 2 is installed between the two sections of the rotor core 1. The oil passage punching plate 2 and the rotor core 1 are jointly sleeved on a hollow shaft. A plurality of oil injection holes are arranged circumferentially at the position where the hollow shaft installs the oil passage punching plate 2. When the hollow shaft rotates at a high speed, the cooling oil is ejected from the spray holes on the hollow shaft, and then flows along the oil passage punching plate to the exciting winding, and flows out from the axial two ends of the rotor core 1 of the exciting winding.

[0018] As Figure 2 shown, the oil passage punching plate 2 includes a hollow turntable 21 that fits with the yoke of the rotor core 1. A plurality of T-shaped plates 22 that fit with the magnetic poles of the rotor core 1 protrude radially outward along the outer circumference of the hollow turntable 21. A gap 23 for winding the exciting winding is formed between adjacent T-shaped plates 22. At least one of the front and back disk surfaces of the hollow turntable 21 is provided with a plurality of strip-shaped grooves 24. Each strip-shaped groove 24 extends radially along the hollow turntable 21 and communicates the through hole in the middle of the hollow turntable 21 with the gap 23 outside the hollow turntable 21.

[0019] In this embodiment, in order to meet the assembly requirements, the projected outer shape of the oil passage punching plate 2 in the axial direction is basically the same as that of the main generator iron core, or slightly reduced. The cooling oil ejected from the hollow shaft flows into the gap 23 through the strip-shaped grooves 24 of the rotor core 1. Since the exciting winding is wound on the magnetic poles of the rotor core 1, that is, wound on the T-shaped plates 22 that fit with the magnetic poles of the rotor core 1, the continuously wound exciting winding fills the gaps between the magnetic poles and between the T-shaped plates 22. Therefore, the cooling oil flowing into the gap 23 actually fills the air gap between the exciting winding and the yoke part of the main generator iron core, reducing the contact thermal resistance between the two, so that part of the heat of the exciting winding enters the yoke part of the main generator iron core by heat conduction, and is further transferred to the hollow shaft and finally taken away by the coolant; in addition, during the process of flowing along the axial direction of the main generator iron core, this part of the cooling oil will also carry part of the heat of the exciting winding through convective heat transfer. The above two heat dissipation paths jointly accelerate the heat dissipation of the exciting winding and effectively reduce its maximum temperature.

[0020] In some alternative embodiments, 8 strip-shaped grooves 24 are evenly distributed circumferentially on the disk surface of the hollow turntable 21.

[0021] Referring Figure 2 , in this embodiment, through eight semi-circular channels, it is convenient to guide the coolant to the exciting winding.

[0022] In some alternative embodiments, one end of the strip-shaped groove 24 connecting the gap 23 is close to the root of the T-shaped plate 22.

[0023] It can be understood that since the exciting winding is wound around the T-shaped plate 22, in this embodiment, the end of the strip-shaped groove 24 is arranged at the root of the T-shaped plate 22, which can accurately direct the cooling oil to the place where the exciting winding has the highest heat, achieving efficient cooling.

[0024] After meeting the heat dissipation requirements, the oil circuit punching sheet also needs to meet the strength requirements during high-speed rotation. For this purpose, in some alternative embodiments, the oil circuit punching sheet 2 is processed from a 30CrMnSiA bar into an integral structure, having relatively high strength and hardness. In order to make the oil circuit punching sheet as lightweight as possible while meeting the strength requirements, in some alternative embodiments, a plurality of weight-reducing holes 25 are provided on the hollow turntable 21. At the same time, fully considering the operability of the part processing technology, the weight-reducing groove is designed as a circle that is easy to process.

[0025] The core function of the oil circuit punching sheet 2 of the present application is to provide a flow path for the coolant. In addition, the maximum rotational speed of this rotor is 25080 r / min. Through static strength simulation analysis, the oil circuit punching sheet can meet the material strength design requirements during high-speed rotation. After meeting the dual requirements of heat dissipation and strength, the structure of the oil circuit punching sheet achieves a lightweight design.

[0026] In some alternative embodiments, the outer diameter dimension of the hollow turntable 21 is smaller than the outer diameter of the yoke of the rotor core 1, so that when the hollow turntable 21 fits the yoke of the rotor core 1, a step is formed between the outer surface of the hollow turntable 21 and the outer surface of the yoke, and the step forms an arc-shaped groove 26 for guiding the cooling oil at the end of the strip-shaped groove 24 to the center of the gap 23.

[0027] Reference Figure 2 , in this embodiment, by designing the radial dimension of the hollow turntable 21 to be slightly smaller than the radial dimension of the yoke of the rotor core 1, after a large number of exciting windings are arranged in the gap 23, the cooling oil can flow along the arc-shaped groove 26 on the outer surface of the exciting winding and the hollow turntable 21 to the middle position, and then flow radially between the two groups of exciting windings.

[0028] In some alternative embodiments, the outer surface of the yoke of the rotor core 1 has an axial groove 27 extending along the axis of the rotor core 1. One end of the axial groove 27 is connected to the strip-shaped groove 24, and the other end is located at the axial end of the rotor core 1.

[0029] In this embodiment, in order to enable the cooling oil to flow smoothly along the axis of the yoke of the rotor core 1, an axial groove 27 is provided on the outer surface of the yoke of the rotor core 1 to guide the cooling oil flowing out of the strip-shaped groove 24 to the end of the rotor core 1, cooling the exciting winding and the yoke along the way.

[0030] The present application increases the heat dissipation path of the exciting winding, accelerates the derivation of the internal heat of the winding, effectively avoids the occurrence of local hot spots in the exciting winding, and significantly improves the reliability of the rotor.

[0031] Although the present application has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it based on the present application, which will be obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present application fall within the scope of protection required by the present application.

Claims

1. An enhanced heat dissipation structure for the main generator rotor of an aviation high-speed variable-frequency oil-cooled generator, characterized in that, It includes a rotor core (1) axially divided into two sections, and an oil passage punching plate (2) is arranged between the two sections of the rotor core (1). The oil passage punching plate (2) includes a hollow turntable (21) that fits against the yoke of the rotor core (1). A plurality of T-shaped plates (22) that fit against the magnetic poles of the rotor core (1) protrude radially outward along the outer circumference of the hollow turntable (21). A gap (23) for winding the exciting winding is formed between adjacent T-shaped plates (22). At least one of the front and back surfaces of the hollow turntable (21) is provided with a plurality of strip-shaped grooves (24). Each strip-shaped groove (24) extends radially along the hollow turntable (21) and communicates the through hole in the middle of the hollow turntable (21) with the gap (23) outside the hollow turntable (21). The oil passage punching plate (2) and the rotor core (1) are jointly sleeved on a hollow shaft. A plurality of oil injection holes are arranged circumferentially at the position where the hollow shaft mounts the oil passage punching plate (2) to spray the cooling oil in the hollow shaft onto the oil passage punching plate (2).

2. The enhanced heat dissipation structure of the main generator rotor of the high-speed variable-frequency oil-cooled aero generator according to claim 1, characterized in that The strip-shaped grooves (24) are evenly distributed in 8 along the circumference on the surface of the hollow turntable (21).

3. The enhanced heat dissipation structure of the main generator rotor of the high-speed variable-frequency oil-cooled aero-generator according to claim 1, characterized in that, One end of the strip-shaped groove (24) connecting the gap (23) is close to the root of the T-shaped plate (22).

4. The enhanced heat dissipation structure of the main generator rotor of the high-speed variable-frequency oil-cooled aero-generator according to claim 1, wherein A plurality of weight-reducing holes (25) are arranged on the hollow turntable (21).

5. The enhanced heat dissipation structure of the main generator rotor of the high-speed variable-frequency oil-cooled aero generator according to claim 4, characterized in that, The weight-reducing holes (25) are round holes.

6. The enhanced heat dissipation structure of the main generator rotor of the high-speed variable-frequency oil-cooled aero-generator according to claim 1, wherein, The oil passage punching plate (2) is processed into an integral structure using a 30CrMnSiA bar stock.

7. The main generator rotor enhanced heat dissipation structure of the aviation high-speed variable-frequency oil-cooled generator according to claim 1, characterized in that, The outer diameter of the hollow turntable (21) is smaller than the outer diameter of the yoke of the rotor core (1). When the hollow turntable (21) fits against the yoke of the rotor core (1), a step is formed between the outer surface of the hollow turntable (21) and the outer surface of the yoke. The step forms an arc-shaped groove (26) for guiding the cooling oil at the end of the strip-shaped groove (24) to flow to the center of the gap (23).

8. The enhanced heat dissipation structure of the main generator rotor of the high-speed variable-frequency oil-cooled aero generator according to claim 1, wherein The outer surface of the yoke of the rotor core (1) has an axial groove (27) extending along the axis of the rotor core (1). One end of the axial groove (27) is connected to the strip-shaped groove (24), and the other end is located at the axial end of the rotor core (1).

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