CN112746978A

CN112746978A - DC centrifugal compressor

Info

Publication number: CN112746978A
Application number: CN201911046142.0A
Authority: CN
Inventors: 俞国新; 许升; 陈庆; 虞朝丰; 车凯; 黄强; 刘增岳; 袁宇波; 孙天奎; 宋斌; 朱万朋; 董玮利
Original assignee: State Grid Jiangsu Electric Power Co Ltd; Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd; Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Current assignee: State Grid Jiangsu Electric Power Co Ltd; Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd; Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2021-05-04

Abstract

The application relates to a direct current centrifugal compressor, comprising: the stator comprises a stator winding and is arranged on a main shaft of the direct-current centrifugal compressor; the rotor is coaxial with the stator and is arranged on one side of the stator, a plurality of permanent magnetic poles are radially distributed, and the polarities of the permanent magnetic poles are alternately distributed. The stator of this application sets up in direct current centrifugal compressor's main shaft, the rotor is coaxial with the stator, and set up in the outside of stator, the polarity of a plurality of permanent magnetism magnetic poles that set up on the rotor distributes in turn, after the stator winding to the stator lets in the electric current, drive the rotor rotation under electromagnetic induction's effect, the rotor sets up and compares in the outside of stator and has now set up in the inside rotor of stator, axial length reduces, thereby the power density of compressor has been improved, the structure that makes the compressor is compacter, whole volume reduces.

Description

DC centrifugal compressor

Technical Field

The present application relates to the field of compressor technology, for example to a direct flow centrifugal compressor.

Background

The centrifugal compressor increases air pressure by means of rotor rotation and diffuser diffusion. When the rotor rotates at high speed, the gas is thrown to the diffuser behind under the action of centrifugal force, so that a vacuum zone is formed at the rotor, and fresh gas outside enters the rotor. The rotor is continuously rotated and gas is continuously sucked in and thrown out, thereby maintaining continuous flow of gas. Most of the motors of the existing centrifugal compressors use a radial structure in which a rotor is disposed inside a stator and at a central position. In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: the motor power density is low, and the length of the stator and the rotor along the axial direction is longer, so that the integral volume of the compressor is larger.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a direct-current centrifugal compressor, which aims to solve the technical problems that the motor power density of the centrifugal compressor is low, the length of a stator and a rotor in the axial direction is long, and the integral volume of the compressor is large.

In some embodiments, a dc centrifugal compressor comprises: a stator including a stator winding; the rotor is coaxial with the stator and is arranged on one side of the stator, a plurality of permanent magnetic poles are radially distributed, and the polarities of the permanent magnetic poles are alternately distributed.

The direct-current centrifugal compressor provided by the embodiment of the disclosure can realize the following technical effects: the stator is coaxial with the rotor, and sets up in one side of stator, and the polarity of a plurality of permanent magnetism magnetic poles that set up on the rotor distributes in turn, after letting in the electric current to the stator winding of stator, drives the rotor and rotates under electromagnetic induction's effect, and the rotor sets up and compares the current rotor that sets up in stator inside in the outside of stator, and the axial length of rotor and stator all reduces, has improved the power density of compressor, makes the structure of compressor compacter, and whole volume reduces.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

FIG. 1 is an exploded schematic view of a stator and rotor combination structure provided by an embodiment of the present disclosure;

FIG. 2 is a bottom view of a rotor provided in accordance with another embodiment;

FIG. 3 is a schematic structural diagram of a stator according to another embodiment;

FIG. 4 is a cross-sectional view of a stator and rotor combination structure provided in accordance with another disclosed embodiment.

Reference numerals:

1. a stator; 10. a stator core; 11. stator teeth; 12. a stator slot; 2. a rotor; 3. a main shaft; 4. a permanent magnetic pole; 5. an air gap; 6. and a bearing.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

Fig. 1 is an exploded schematic view of a stator 1 and a rotor 2 combined structure provided by an embodiment of the present disclosure. As shown in fig. 1, an embodiment of the present disclosure provides a direct current centrifugal compressor, including: a stator 1 including a stator winding; the rotor 2 is coaxial with the stator 1 and is arranged on one side of the stator 1, and is provided with a plurality of permanent magnetic poles 4 distributed in a radial shape, and the polarities of the permanent magnetic poles 4 are distributed alternately.

Stator 1 is coaxial with rotor 2, and set up in one side of stator 1, the polarity of a plurality of permanent magnetism magnetic poles 4 that set up on rotor 2 distributes in turn, after letting in electric current to stator 1's stator winding, drive rotor 2 and rotate under electromagnetic induction's effect, rotor 2 sets up and compares the current rotor 2 that sets up in stator 1 inside in stator 1's the outside of stator 1, can needn't be longer at axial extension, the axial length of rotor and stator all reduces, the power density of compressor has been improved, make the structure of compressor compacter, the whole volume reduces.

Optionally, the permanent magnet is a neodymium iron boron material. The Nd-Fe-B material is an intermetallic compound Nd₂Fe₁₄The permanent magnetic material based on B has extremely high magnetic energy and coercive force. In this way, the permanent magnets can be enhanced to interact with the stator windings. Optionally, the material of the rotor 2 is a high-strength cast aluminum material. The rotor 2 is made of high-strength cast aluminum material through processing or casting, so that the rotor 2 has certain mechanical strength and the cost is reduced. Alternatively, the stator 1 is laminated by silicon steel sheets. The coil is electrified to generate current loss, and the silicon steel sheets are mutually insulated and pass through a smaller cross section to increase the resistance on a path so as to reduce the loss.

In some embodiments, the permanent magnet poles 4 are disposed on a side of the rotor 2 adjacent to the stator 1. Stator winding sets up on stator 1, and permanent magnetic pole 4 sets up in one side that rotor 2 is close to stator 1, and permanent magnetic pole 4 axial magnetization produces multipolar axial magnetic field, and the effect between the stator winding strengthens, can drive rotor 2 to rotate by force.

Fig. 2 is a bottom view of the rotor 2 according to another embodiment. As shown in fig. 2, in some embodiments, the permanent magnet poles 4 are attached to the surface of the rotor 2. The thickness of the permanent magnetic pole 4 is small, the permanent magnetic pole can be attached to the surface of the rotor 2, slotting on the surface of the rotor 2 is avoided, and the setting is more convenient. Alternatively, the surface of the rotor 2 is provided with mounting grooves in which the permanent magnet poles 4 are embedded. In this way, the permanent magnet pole 4 can be made more robust and reliable.

In some embodiments, the permanent magnet poles 4 are fan-shaped or cylindrical. The shape of the magnetic field generated by the permanent magnet poles 4, which are in the shape of a sector ring or a cylinder, can effectively act on the magnetic field of the stator winding. The fanning shape enables the area of each permanent magnet pole 4 to be as large as possible. A plurality of permanent magnet poles 4 in a sector ring shape or a cylindrical shape are alternately arranged in N, S polarities, thereby generating a multi-pole axial magnetic field.

Fig. 3 is a schematic structural view of a stator 1 according to another embodiment. As shown in fig. 3, in some embodiments, the stator 1 is disk-shaped. The length of the disk-shaped stator 1 in the axial direction is small, so that the occupation of the internal space of the direct-current centrifugal compressor can be reduced, and the volume of the compressor can be reduced. Alternatively, the rotor 2 is disc-shaped. The disk-shaped rotor 2 has a small length in the axial direction, so that the occupation of the internal space of the direct-flow centrifugal compressor can be reduced, and the volume of the compressor can be reduced. The disk-shaped stator 1 and the rotor 2 are more material-saving. Stator 1 and rotor 2 coaxial arrangement compare ordinary cylinder formula stator 1 and the cylinder formula rotor 2 of nestification in stator 1 center, do not have because the torque pulsation that the tooth's socket arouses, torque output is steady, does not have hysteresis lag and eddy current loss, can reach the efficiency that increases. The stator winding has small inductance and good commutation performance. The stator winding has small moment of inertia and excellent quick response performance, and is suitable for frequent starting and braking.

In some embodiments, the side of the rotor 2 facing away from the stator 1 is provided with vanes (not shown). After the blades are arranged, the rotor 2 can be used as an impeller of a direct-current centrifugal compressor, gas is under the action of the impeller blades and rotates along with the impeller in a telling mode, and the gas flows under the action of rotating centrifugal force and in the impeller in a diffusion mode, so that the pressure of the gas after passing through the impeller is improved. The combination of the electronic rotor 2 with the impeller of the compressor greatly simplifies the structure of the compressor, thus enabling the overall volume of the compressor to be reduced.

In some embodiments, as shown in fig. 3, the stator 1 includes: a stator core 10 having an annular shape; wherein the stator winding is spirally wound around the stator core 10.

The stator winding is spirally wound and is arranged orderly, the number of the arranged turns of the stator winding is increased, and the magnetic flux is effectively improved. The stator winding is a winding installed on the stator 1, namely a copper wire wound on the stator 1, the stator winding generates a rotating magnetic field after being electrified, and the rotor 2 is cut by magnetic lines of force in the rotating magnetic field to generate current.

In some embodiments, the stator core 10 includes a plurality of stator teeth 11 arranged in a radial shape, stator slots 12 are formed between the stator teeth 11, and a stator winding is embedded in the stator slots 12. The stator teeth 11 are arranged in a radial shape, and stator slots 12 between the stator teeth 11 are used for embedding and winding stator windings, so that the stator windings are distributed in a radial shape. The stator teeth 11 and the stator slots 12 also enable a firm winding of the stator winding. Optionally, the dc centrifugal compressor further comprises: and a stator 1 yoke portion provided on one side of the plurality of stator teeth 11.

Fig. 4 is a sectional view of a combined structure of a stator 1 and a rotor 2 provided in another disclosed embodiment. As shown in fig. 4, in some embodiments, an air gap 5 is formed between the rotor 2 and the stator 1. The permanent magnet poles 4 form an air gap 5 magnetic field within the air gap 5, and energy is transferred through the air gap 5 magnetic field. The smaller the gap of the air gap 5, the greater the force of the magnetic field train, and the more kinetic or electrical energy from the rotor 2 and the stator 1 can be absorbed. The distance between the rotor 2 and the stator 1 can be set smaller, so that the air gap 5 formed is smaller, to increase the force of the magnetic field train and improve the energy transfer effect.

In some embodiments, the once-through centrifugal compressor further comprises: and the main shaft is fixed at the center of one side of the rotor and is rotationally connected with the stator through a bearing.

The main shaft 3 is rotatably connected with the stator 1 through a bearing 6, and the bearing 6 is arranged at the center of the stator 1. The stator 1 remains stationary while the rotor 2 and the main shaft 3 rotate together. The bearing 6 is arranged at the center of the stator 1, the length of the stator 1 in the axial direction can be effectively reduced, and the compressor is compact in structure, small in size and high in power density. The main shaft 3 is configured to mount all rotating parts of the dc centrifugal compressor, support the rotating parts, and transmit torque. The axis of the spindle 3 determines the geometric axis of each rotating part. Optionally, the main shaft 3 is a stepped shaft. Thus, the installation of parts is convenient, and the protruding shoulders of the steps play a role in axial positioning.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the disclosed embodiments includes the full ambit of the claims, as well as all available equivalents of the claims. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.

The terms "upper", "lower", "inner", "outer", and the like herein indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience in describing and simplifying the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, and indirect connections via intermediary media, where the specific meaning of the terms is understood by those skilled in the art as appropriate. Herein, the term "plurality" means two or more, unless otherwise specified.

Claims

1. A direct flow centrifugal compressor, comprising:

a stator including a stator winding;

the rotor is coaxial with the stator and is arranged on one side of the stator, a plurality of permanent magnetic poles are radially distributed, and the polarities of the permanent magnetic poles are alternately distributed.

2. The DC centrifugal compressor of claim 1, wherein the permanent magnet poles are disposed on a side of the rotor adjacent to the stator.

3. The DC centrifugal compressor of claim 1, wherein the permanent magnet poles are attached to the surface of the rotor.

4. The DC centrifugal compressor of claim 1, wherein the permanent magnet poles are sector-ring shaped or cylindrical.

5. The direct flow centrifugal compressor of claim 1, wherein the stator is disc-shaped.

6. The DC centrifugal compressor of claim 1, wherein a side of the rotor facing away from the stator is provided with vanes.

7. The direct flow centrifugal compressor of any one of claims 1 to 6, wherein the stator comprises:

the stator iron core is annular;

wherein the stator winding is spirally wound around the stator core.

8. The DC centrifugal compressor of claim 7, wherein the stator core comprises a plurality of stator teeth arranged in a radial pattern, the stator teeth having stator slots formed therebetween, and the stator winding embedded in the stator slots.

9. The DC centrifugal compressor according to any of claims 1 to 6, wherein an air gap is formed between the rotor and the stator.

10. The direct flow centrifugal compressor of any one of claims 1 to 6, further comprising:

and the main shaft is fixed at the center of one side of the rotor and is rotationally connected with the stator through a bearing.