CN110492632A - A kind of air intake vent frame and a kind of generator amature for rotor - Google Patents

Abstract

The present invention relates to a kind of air intake vent frame for rotor, the air intake vent frame is configured to the air intake vent at least partially around rotor, wherein the inner surface of the air intake vent frame has the corner of arc.The invention further relates to a kind of sheet metal for engine rotor and a kind of engine rotors.By the invention it is possible to substantially reduce the vena contracta phenomenon of air intake vent, the air flow rate in internal rotor air duct is thus greatly improved, and then solves the problems, such as aerodynamic noise and is improved the radiating efficiency of rotor.

Description

An air inlet frame for a rotor and a generator rotor

technical field

The present invention generally relates to the field of generators, and in particular, to an air inlet frame for a rotor. In addition, the present invention also relates to a generator rotor.

Background technique

A generator is a mechanical device that converts other forms of energy, such as wind and water, into electrical energy, and its main components are a stator and a rotor. The principle of a generator is that under the action of a source power, such as wind or hydraulic, the rotor turns so that the coils cut the magnetic field lines to generate an induced current.

Currently, air ducts are provided in the rotors of some generators to dissipate heat from the rotors and stators. However, the air duct structure of the existing rotor may lead to a large resistance of the air duct inside the rotor, a small flow rate generated by itself, and aerodynamic noise problems; in many cases, additional cooling fans are required to ensure the temperature rise of the generator. This results in an increase in investment costs and operation and maintenance costs.

SUMMARY OF THE INVENTION

The task of the present invention is to provide an air inlet frame for a rotor and a generator rotor, by means of which the air inlet frame and/or the generator rotor can significantly reduce the Vena Contracta phenomenon of the air inlet, by This greatly improves the airflow in the air duct inside the rotor, thereby solving the problem of aerodynamic noise and improving the heat dissipation efficiency of the rotor.

In a first aspect of the invention, this task is solved by an air inlet frame for a rotor, the air inlet frame being configured to at least partially enclose an air inlet of the rotor, wherein the inner surface of the air inlet frame Has curved corners.

Within the scope of the present invention, the term "arc-shaped corners" covers corners where the surface is a curved surface rather than a flat surface, such curved surfaces may be, for example, ellipsoids, spheres, irregular curved surfaces, and the like.

In a preferred solution of the present invention, it is provided that the inner surface of the air inlet frame has arc-shaped corners at the top and the bottom in the thickness direction, respectively. By configuring the two corners to be arcs, the phenomenon of constriction at the air inlet can be further reduced. In one embodiment, the inner surface of the frame may include only a single arcuate corner, or both corners may be rounded such that the curved surfaces of the two corners merge with each other.

In a development of the invention, it is provided that the curved corners are obtained by rounding the corners by means of a die. The arc-shaped corners can be formed by various suitable processes, such as a grinding and rounding process, a laser cutting process, a chemical etching process, and the like.

In a further development of the invention it is provided that the air inlet frame is made of silicon steel. By using silicon steel as the material of the air inlet frame, the air inlet frame with high magnetic permeability and high plasticity can be provided.

In a further development of the invention, it is provided that the air inlet frame is designed to be connectable to the air inlet of the rotor by welding, gluing, screwing, or to be integrally formed with the air inlet.

In a second aspect of the present invention, the aforementioned task is achieved by a metal sheet for a generator rotor, the metal sheet having an air inlet on a side close to the rotating shaft, wherein the air inlet has an arc-shaped corner.

Within the scope of the present invention, the term "sheet metal" covers metallic material, such as sheet metal, sheet metal, etc., whose thickness is less than the length and width.

In a preferred solution of the present invention, it is provided that the metal sheet has a plurality of air inlets, and each of the air inlets respectively has an arc-shaped corner at the top and the bottom in the thickness direction of the metal sheet. Air inlets can be formed by punching and rounding sheet metal using a die.

Furthermore, the invention relates to a generator rotor comprising a plurality of metal sheets according to the invention. For example, metal sheets with different sizes of air inlets may be provided in the plurality of metal sheets constituting the rotor, so as to ensure that after the metal sheets are punched, their air inlets can be preferably flush with each other.

In addition, the invention also relates to a wind generator comprising a generator rotor according to the invention.

The present invention has at least the following beneficial effects: by adopting the air inlet with an arc-shaped turning angle, the present invention can significantly reduce the constriction phenomenon of the air inlet, thereby reducing the ventilation resistance inside the rotor and improving the self-driving flow of the rotor. It can bring better cooling effect and reduce aerodynamic noise at the same time. In addition, due to the increase of air flow, the rotor does not need an additional cooling fan, which reduces investment and operation and maintenance costs, and improves system reliability and stability.

Description of drawings

The present invention is further described below with reference to the accompanying drawings in conjunction with specific embodiments.

Fig. 1 shows the principle on which the present invention is based;

Figure 2 shows a cut-out portion of a metal sheet for a generator rotor according to the present invention; and

Figures 3a-3b show schematic diagrams of airflow flow in a generator rotor according to the present invention.

Detailed ways

It should be noted that various components in the various figures may be shown exaggerated for illustration purposes and not necessarily to correct scale. In the various figures, identical or functionally identical components are provided with the same reference numerals.

In the present invention, unless otherwise specified, "arranged on," "arranged over," and "arranged over" do not exclude the case where there is an intermediate between the two. In addition, "arranged on or above" only means the relative positional relationship between two components, and in certain circumstances, such as after reversing the product direction, it can also be converted to "arranged under or below", and vice versa Of course.

In the present invention, each embodiment is only intended to illustrate the solution of the present invention, and should not be construed as limiting.

In the present invention, unless otherwise specified, the quantifiers "a" and "an" do not exclude the scenario of multiple elements.

It should also be pointed out here that, in the embodiments of the present invention, for the sake of clarity and simplicity, only a part of the components or assemblies may be shown, but those of ordinary skill in the art can understand that under the teaching of the present invention, according to specific The scene needs to add the required parts or components.

It should also be pointed out that within the scope of the present invention, the terms "same", "equal" and "equal to" do not mean that the two values are absolutely equal, but allow a certain reasonable error, that is, the said The wording also covers "substantially the same", "substantially equal", "substantially equal". By analogy, in the present invention, the terms "perpendicular to", "parallel to" and the like in the table direction also cover the meanings of "substantially perpendicular to" and "substantially parallel to".

In addition, the numbering of the steps of each method of the present invention does not limit the execution order of the method steps. Unless otherwise indicated, the various method steps may be performed in a different order.

The present invention is further described below with reference to the accompanying drawings in conjunction with specific embodiments.

The present invention is based on the following insight of the inventors: in the existing rotor, the air inlets are right-angle corners, so that when the fluid flows through these right-angle corners (or corners), a backflow low-pressure area 1 (or separation) will be formed at the corners vortex), which results in the formation of a throat region in the runner cross-section, the narrowest region in the cross-section, referred to here as Vena Contracta, which can be seen in Figure 1; the actual runner width of the rotor is due to these The existence of the vortex at the corner cannot be fully utilized, resulting in local resistance loss and reducing the system flow. In the present invention, by constructing the air inlet with an arc-shaped corner, the phenomenon of constriction can be significantly reduced, thereby increasing the wind. Air flow in the channel.

The left part in Fig. 2 shows a cut-out part of a metal sheet 100 for a generator rotor according to the present invention, and the right part shows a cross-sectional view of the metal sheet 100.

The metal sheet 100 is, for example, circular and has a plurality of air inlets 101 , and only a part of the metal sheet 100 is shown here. The air inlet 101 is disposed on the side of the metal sheet 100 close to the rotating shaft. The air inlet has an arc-shaped corner 102 . Within the scope of the present invention, the term "arc-shaped corners" covers corners where the surface is a curved surface rather than a flat surface, such curved surfaces may be, for example, ellipsoids, spheres, irregular curved surfaces, and the like. The air inlet can be formed by punching a metal sheet with a die, and then rounding the edges of the air inlet by the die. The material of the metal sheet can be a suitable metal or alloy, preferably silicon steel.

Figures 3a-3b show schematic diagrams of airflow flow in a generator rotor according to the present invention.

As shown in Figures 3a-3b, in the generator rotor 200, the airflow in the axial air inlet 201 is sucked by the ventilation ribs in the rotor ventilation channel and enters the rotor, and then the airflow is deflected by 90 degrees and enters the radial ventilation Road 202. It can be seen from Fig. 2 that due to the arc-shaped corner design of the present invention (refer to the circle in Fig. 2), the constriction at the corner is significantly reduced, thereby better utilizing the width of the ventilation channel and reducing the flow loss .

The present invention has at least the following beneficial effects: by adopting the air inlet with an arc-shaped turning angle, the present invention can significantly reduce the constriction phenomenon of the air inlet, thereby reducing the ventilation resistance inside the rotor and improving the self-driving flow of the rotor. It can bring better cooling effect and reduce aerodynamic noise at the same time. In addition, due to the increase of air flow, the rotor does not need an additional cooling fan, which reduces investment and operation and maintenance costs, and improves system reliability and stability.

While some embodiments of the invention have been described in this document, those skilled in the art will appreciate that these embodiments are shown by way of example only. Numerous modifications, alternatives and improvements will occur to those skilled in the art under the teachings of this invention without departing from the scope of this invention. It is intended that the appended claims define the scope of the invention and that methods and structures within the scope of the claims themselves and their equivalents be covered thereby.

Claims (10)

What is claimed is: 1. An air inlet frame for a rotor, the air inlet frame being configured to at least partially surround an air inlet of a rotor, wherein an inner surface of the air inlet frame has an arcuate corner. 2 . The air inlet frame according to claim 1 , wherein the inner surface of the air inlet frame has arc-shaped corners at the top and the bottom in the thickness direction, respectively. 3 . 3. The air inlet frame according to claim 1, wherein the curved corners are obtained by rounding the corners with a mold. 4. The air inlet frame of claim 1, wherein the air inlet frame is made of silicon steel. 5 . The air inlet frame of claim 1 , wherein the air inlet frame is configured to be connectable to the air inlet of the rotor by welding, gluing, bolting, or integrally formed with the air inlet. 6 . 6. A metal sheet for a generator rotor, the metal sheet has an air inlet on a side close to a rotating shaft, wherein the air inlet has an arc-shaped corner. 7 . The metal sheet according to claim 5 , wherein the metal sheet has a plurality of air inlets, and each air inlet has an arc-shaped corner at the top and the bottom in the thickness direction of the metal sheet, respectively. 8 . 8. The metal sheet of claim 5, wherein the metal sheet is made of silicon steel. 9. A generator rotor comprising a plurality of metal sheets according to any one of claims 6 to 9. 10. A wind generator comprising the generator rotor of claim 9.