Oil path punching sheet for heat dissipation of main generator rotor of oil-cooled generator

Abstract

The utility model belongs to the field of aero-generator design, and particularly relates to an oil path punching sheet for heat dissipation of a main generator rotor of an oil-cooled generator. The oil path punching sheet (2) is arranged between a rotor core (1) which is cut into two sections and comprises a hollow rotating disc (21) which is attached to a magnet yoke of the rotor core (1), a plurality of T-shaped plates (22) which are attached to magnetic poles of the rotor core (1) are arranged on the periphery of the hollow rotating disc (21) in an outward protruding mode in the radial direction of the hollow rotating disc (21), and gaps (23) used for winding excitation windings are formed between the adjacent T-shaped plates (22). A plurality of strip-shaped grooves (24) are formed in at least one of the front disc face and the back disc face of the hollow rotary disc (21), and each strip-shaped groove (24) extends in the radial direction of the hollow rotary disc (21) and is communicated with a through hole in the middle of the hollow rotary disc (21) and a gap (23) outside the hollow rotary disc (21). 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 an oil circuit punching sheet for cooling the main generator rotor of an oil-cooled generator. Background Art

[0002] A typical aviation three-stage high-speed variable-frequency AC generator has a capacity of 90 / 120 kVA, an operating speed range of (10800 - 25080) r / min, and a frequency range of (360 - 800) Hz. The cooling of the main generator rotor mainly relies on cooling oil flowing through the hollow shaft and spraying radially from the radial spray holes towards the end windings at both ends. Limited by the speed and frequency, the main generator iron core can only be designed with two pairs of poles. The main generator excitation windings are evenly distributed on the four pole bodies of the iron core, and the winding wire packages are bulky and have a relatively 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. Summary of the Utility Model

[0003] To solve the above problems, this application provides an oil circuit punching sheet for cooling the main generator rotor of an oil-cooled generator. The oil circuit punching sheet is arranged between the rotor iron cores cut into two sections. The oil circuit 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 along the outer circumference 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 disk 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 connects the through hole in the middle of the hollow turntable with the gap outside the hollow turntable.

[0004] Preferably, 8 strip-shaped grooves are evenly distributed in the circumferential direction on the disk surface of the hollow turntable.

[0005] Preferably, one end of the strip-shaped groove connecting the gap is close to the root of the T-shaped plate.

[0006] Preferably, a plurality of weight-reducing holes are provided on the hollow turntable.

[0007] Preferably, the weight-reducing holes are round holes.

[0008] Preferably, the oil circuit punching sheet is processed into an integral structure from a 30CrMnSiA bar.

[0009] This application improves the cooling of the main generator rotor and effectively reduces the temperature rise of the excitation winding. Description of the Drawings

[0010] Figure 1 It is an installation schematic diagram of a preferred embodiment of the oil circuit punching sheet for cooling the main generator rotor of this application.

[0011] Figure 2 It is a schematic structural diagram of a preferred embodiment of the oil circuit punching sheet for cooling the main generator rotor of the oil-cooled generator in this application.

[0012] Figure 3 is this application Figure 2 The rear view of the illustrated embodiment.

[0013] Among them, 1 - rotor core, 2 - oil circuit punching sheet, 21 - hollow turntable, 22 - T-shaped plate, 23 - gap, 24 - strip groove, 25 - weight reduction hole. Detailed implementation manners

[0014] To make the purpose, technical solutions, and advantages of the implementation of this application clearer, the technical solutions in the implementation manners of this application will be described in more detail below in conjunction with the drawings in the implementation manners of this application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The described implementation manners are part of the implementation manners of this application, rather than all of the implementation manners. The implementation manners described below by referring to the drawings are exemplary and are intended to explain this application, and should not be construed as a limitation of this application. Based on the implementation manners in this application, all other implementation manners obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by this application. The implementation manners of this application will be described in detail below in conjunction with the drawings.

[0015] This application provides an oil circuit punching sheet for cooling the main generator rotor of an oil-cooled generator to improve the heat dissipation of the main generator rotor. As Figure 1 shown, the rotor core 1 of the main generator is axially symmetrically cut into two sections, and an oil circuit punching sheet 2 is installed between the two sections of the rotor core 1. 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 circuit punching sheet to the exciting winding and flows out from the axial two ends of the rotor core 1. Part of this cooling oil carries away part of the heat of the exciting winding during the flowing process along the way, effectively reducing the temperature rise of the exciting winding.

[0016] As Figure 2 and Figure 3 shown, the oil circuit punching sheet 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 grooves 24. Each strip 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.

[0017] In this embodiment, to meet the assembly requirements, the projected outer shape of the oil circuit punching sheet 2 in the axial direction is basically the same as that of the main generator core, or slightly reduced. The cooling oil ejected from the hollow shaft flows through the strip-shaped grooves 24 of the rotor core 1 into the gap 23. Since the exciting winding is wound around the magnetic poles of the rotor core 1, that is, around the T-shaped plate 22 that fits 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. The cooling oil flowing into the gap 23 flows out along the exciting winding towards the axial ends of the rotor core 1, taking away the heat of the exciting winding.

[0018] In some alternative embodiments, there are 8 strip-shaped grooves 24 evenly distributed along the circumferential direction on the disk surface of the hollow turntable 21.

[0019] Reference Figure 3 , in this embodiment, through eight semi-circular channels, it is convenient to guide the coolant to the exciting winding.

[0020] In some alternative embodiments, one end of the strip-shaped groove 24 connecting to the gap 23 is close to the root of the T-shaped plate 22.

[0021] 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 heat of the exciting winding is the highest, achieving efficient cooling.

[0022] 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 grooves are designed as circles that are easy to process.

[0023] The core function of the oil circuit punching sheet 2 of this 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.

[0024] Although the present application has been described in detail above with general descriptions and specific implementation examples, based on the present application, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present application all fall within the scope protected by the present application.

Claims

1. An oil circuit punching piece for the heat dissipation of the main generator rotor of an oil-cooled generator, characterized in that, The oil circuit punching sheet (2) is arranged between the rotor cores (1) cut into two sections. The oil circuit punching sheet (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).

2. The oil circuit punching sheet for cooling the main generator rotor of an oil-cooled generator according to claim 1, wherein, Eight strip-shaped grooves (24) are evenly distributed circumferentially on the surface of the hollow turntable (21).

3. The oil circuit punching sheet for cooling the main generator rotor of an oil-cooled 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 oil circuit punching sheet for the main generator rotor heat dissipation of an oil-cooled generator according to claim 1, characterized in that, A plurality of weight-reducing holes (25) are provided on the hollow turntable (21).

5. The oil circuit punching sheet for the main generator rotor heat dissipation of an oil-cooled generator according to claim 4, characterized in that, The weight-reducing holes (25) are round holes.

6. The oil circuit punching piece for the main generator rotor heat dissipation of an oil-cooled generator according to claim 1, wherein The oil circuit punching sheet (2) is processed into an integral structure from a 30CrMnSiA bar stock.

Images