WO2018040352A1 - 用于往复式压缩机的变频转子和具有其的压缩机 - Google Patents

用于往复式压缩机的变频转子和具有其的压缩机 Download PDF

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Publication number
WO2018040352A1
WO2018040352A1 PCT/CN2016/108740 CN2016108740W WO2018040352A1 WO 2018040352 A1 WO2018040352 A1 WO 2018040352A1 CN 2016108740 W CN2016108740 W CN 2016108740W WO 2018040352 A1 WO2018040352 A1 WO 2018040352A1
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Prior art keywords
straight portion
magnet
rotor
reciprocating compressor
contour line
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PCT/CN2016/108740
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English (en)
French (fr)
Inventor
陈海全
孙祥
严志奇
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Midea Group Co Ltd
Anhui Meizhi Compressor Co Ltd
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Midea Group Co Ltd
Anhui Meizhi Compressor Co Ltd
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Publication of WO2018040352A1 publication Critical patent/WO2018040352A1/zh
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets

Definitions

  • the present invention relates to the field of compressor technology, and more particularly to a variable frequency rotor for a reciprocating compressor and a compressor having the same.
  • the variable frequency reciprocating refrigeration compressor of the related art mainly comprises a motor stator and a rotor, wherein the rotor comprises a rotor core and a permanent magnet, and a rotor is arranged with a positioning groove of a permanent magnet, so as to ensure a high magnetic flux of the rotor.
  • the above-mentioned permanent magnet slot is designed as an arc groove or other complicated groove shape, thereby increasing the volume of the permanent magnet.
  • the existing rotor core structure is a regular arc shape.
  • the existing spindle pump oil mode is centrifugal pump oil.
  • the centrifugal pump oil capacity is often directly related to the spindle speed and outer diameter.
  • the variable frequency reciprocating compressor has a wide operating frequency. When the compressor is running at a lower speed, a larger outer diameter of the spindle is required to ensure a sufficient amount of pump oil.
  • the present invention aims to solve at least one of the technical problems in the related art to some extent.
  • the present invention proposes a variable frequency rotor for a reciprocating compressor which can reduce the outer diameter of the rotor without reducing the size of the center hole of the variable frequency rotor, thereby ensuring performance and reliability. Under the premise of reducing the volume of the motor and compressor with it.
  • the present invention also proposes a compressor having the variable frequency rotor for a reciprocating compressor.
  • An inverter rotor for a reciprocating compressor includes: a rotor core provided with a center hole penetrating in an axial direction thereof and a plurality of magnets provided on an outer circumference of the center hole a groove, each of the magnet slots is formed substantially as an arcuate groove that is curved inwardly along a radial direction of the rotor core, and the arcuate groove is formed as an inner contour line adjacent to a side contour of the center hole.
  • An outline of one side of the arcuate groove away from the center hole is formed as an outer contour line, a radius of curvature of a middle portion of the inner contour line is larger than a radius of curvature of both ends, and a magnet, the magnet being adapted to be mounted in the magnet groove.
  • the radius of curvature of the middle portion of the inner contour of the magnet groove is larger than the radius of curvature of both ends.
  • the outer diameter of the rotor core can be reduced without ensuring that the aperture size of the center hole is not reduced. Inch. Thereby, the pumping capacity of the compressor at a low rotational speed can be ensured, and the capacity of the variable frequency rotor can be reduced, thereby reducing the volume of the motor and the compressor having the same under the premise of ensuring performance and reliability.
  • variable frequency rotor for a reciprocating compressor may further have the following additional technical features:
  • the middle portion of the inner contour is formed as a first straight portion that extends in a radial direction perpendicular to the rotor core.
  • At least one outer contour of the magnet slot is provided with a second straight portion, and the second straight portion of the same magnet slot and the first straight portion are along a radial direction of the central hole The lines are spaced apart and the line connecting the first straight portion and the midpoint of the second straight portion passes through the center of the center hole.
  • an outer contour line of each of the magnet slots is provided with the second straight portion, and the second straight portion of the same magnet slot and the first straight portion along the central hole Radially spaced apart and a line connecting the first straight portion and the midpoint of the second straight portion passes through the center of the center hole.
  • the length of the first straight portion of the same magnet slot is equal to the length of the second straight portion.
  • portions of the inner contour line at both ends of the first straight portion are respectively formed as curved line segments.
  • the curved line segment at both ends of the first straight portion is symmetrical with respect to a line passing through a midpoint of the first straight portion and a center point of the rotor core.
  • the magnet slots include at least four, and the plurality of the magnet slots are evenly spaced apart from each other along a circumferential direction of the center hole.
  • the present invention also proposes a reciprocating compressor having the variable frequency rotor for a reciprocating compressor of the above-described embodiment of the invention.
  • the compressor of the embodiment of the invention since the inverter rotor for a reciprocating compressor of the above embodiment is provided, the compressor of the embodiment of the invention also has the above-described technical effects. That is, according to the compressor of the embodiment of the present invention, by providing the variable frequency rotor for the reciprocating compressor of the above embodiment, the outer diameter of the inverter rotor can be reduced while ensuring that the aperture size of the center hole of the rotor is not reduced, thereby enabling The volume of the motor and compressor with it is reduced while ensuring the performance and reliability of the compressor.
  • FIG. 1 is a schematic structural view of a rotor core of a prior art variable frequency rotor for a reciprocating compressor
  • FIG. 2 is a schematic structural view of a rotor core of a variable frequency rotor for a reciprocating compressor according to an embodiment of the present invention.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • the terms “installation”, “connected”, “connected”, “fixed” and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. Or in one piece; it may be a mechanical connection, or it may be an electrical connection or a communication with each other; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship between two elements. Unless otherwise expressly defined. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • variable frequency rotor for a reciprocating compressor of the present invention can be applied to a small inverter compressor.
  • variable frequency rotor for a reciprocating compressor may include a rotor core 100 and a magnet (shown in the drawing).
  • the rotor core 100 is provided with a center hole 2 penetrating in the axial direction thereof and a plurality of magnet slots 1 provided on the outer circumference of the center hole 2, each magnet groove 1 being formed substantially in the radial direction of the rotor core 100, respectively.
  • the radius of curvature is larger than the radius of curvature of both ends, and the magnet is adapted to be mounted in the magnet slot 1.
  • each of the magnet slots 1 is formed as a substantially arcuate groove which is curved inward in the radial direction of the rotor core 100.
  • the shape of the magnet can be inside the magnet slot 1
  • the wall faces are adapted to facilitate assembly of the magnet with the magnet slot 1.
  • the outline of the arcuate groove includes an inner contour line 11 and an outer contour line 12, the inner contour line 11 is adjacent to the center hole 2 and protrudes toward the center hole 2, and the outer contour line 12 is away from the center hole 2 and It protrudes toward the center hole 2 and is located outside the inner contour line 11 in the radial direction of the center hole 2.
  • the magnet slot a1 of the inverter rotor for a reciprocating compressor in the conventional art is formed as a regular arcuate groove, and the curvature of the inner contour of the arcuate groove is the same, and the center of the center hole is
  • the radial dimension in the middle of the inner contour line i.e., d11 as shown in Fig. 1 is small, and the radial dimension between the contour line of the center hole and the middle portion of the inner contour line is small, and the outer diameter of the rotor core is reduced.
  • the aperture size of the central hole must be correspondingly reduced, which will affect the performance of the variable frequency rotor, thereby reducing the lubrication of the various moving pairs of the compressor at low rotational speed, which seriously affects the reliability of the compressor.
  • the radius of curvature of the middle portion of the inner contour line 11 is larger than the radius of curvature of both ends. That is, the inward bending of the inner contour line 11 is reduced, that is, the radial dimension of the center point of the inner contour line 11 to the center point of the center hole 2 (i.e., d21 as shown in FIG. 2) is increased, and the contour of the center hole 2 is increased. The radial dimension of the middle of the inner contour line 11 of the wire and magnet slot 1 is increased.
  • the aperture size of the center hole 2 i.e., d2 shown in Fig.
  • the radius of curvature of the middle portion of the inner contour line 11 of the magnet groove 1 is larger than the radius of curvature of both ends.
  • the outer diameter dimension D2 of the rotor core 100 can be lowered. This ensures the pumping capacity of the compressor at low speeds. Thereby, under the premise of ensuring performance and reliability, the volume of the inverter rotor can be reduced, thereby reducing the volume of the motor and the compressor having the same.
  • the middle portion of the inner contour line 11 may be formed as a first straight portion 111 that extends in a radial direction perpendicular to the rotor core 100.
  • the middle portion of the inner contour line 11 may be formed as a straight line (ie, the first straight portion 111), and the middle portion of the inner contour line 11 and the radial dimension of the center hole 2, that is, the contour line of the center hole 2 is closest to the inner contour line
  • the first straight portion 111 extends perpendicularly to the line connecting the center of the contour line 11 and the center of the center hole and is perpendicular to the radial direction of the rotor core 100, where the rotor
  • the radial direction of the iron core 100 refers to the radial direction of the line connecting the center of the center hole 2 to the contour of the center hole 2 closest to the midpoint of the inner contour line 11, the first straight portion 111 and the radial
  • the present invention is not particularly limited to the size of the first straight portion 111 (i.e., L2 shown in FIG. 2).
  • the outer contour line 12 of the at least one magnet slot 1 may be provided with a second straight portion 121, and the second straight portion 121 of the same magnet slot 1 is spaced apart from the first straight portion 111 in the radial direction of the central hole 2.
  • the line connecting the midpoints of the first straight portion 111 and the second straight portion 121 passes through the center of the center hole 2.
  • the magnet is adapted to the magnet slot 1, that is, the shape of the magnet
  • the shape of the magnet slot 1 may be adapted, and the first straight portion 111 is parallel to the second straight portion 121, and the magnet may be formed on the magnet in a shape in which the first straight portion 111 and the second straight portion 121 are fitted. So that the thickness of the magnet can be kept substantially uniform. Thereby, the structure of the magnet groove 1 and the magnet can be made more regular and reasonable. Thereby, it facilitates the formation of the magnet groove 1 and the production of the magnet.
  • each magnet slot 1 may be respectively provided with a second straight portion 121, and the second straight portion 121 of the same magnet slot 1 and the first straight portion 111 are along the central hole.
  • the radial spacing of 2 is set and the line connecting the midpoints of the first straight portion 111 and the second straight portion 121 passes through the center of the center hole 2.
  • each of the magnet slots 1 is provided with a second straight portion 121, and the second straight portion 121 of the outer contour line 12 of each magnet slot 1 is parallel to the first straight portion 111 of the inner contour line 11 and along the center
  • the holes 2 are diametrically opposed to each other and the first straight portion 111 is parallel to the second straight portion 121.
  • the length of the first straight portion 111 of the same magnet groove 1 is equal to the length of the second straight portion 121.
  • the distance between the first straight portion 111 and the second straight portion 121 is the same, and the magnet is adapted to the magnet groove 1 so that the magnet is opposite to the first straight portion 111 and the second straight portion 121
  • the thickness of the portion remains substantially the same. This facilitates the production of magnets and variable frequency rotors, as well as the performance and reliability of variable frequency rotors.
  • the portions of the inner contour line 11 at both ends of the first straight portion 111 are respectively formed as curved line segments 112.
  • the inner contour line 11 includes a first straight portion 111 and a curved line segment 112, the first straight portion 111 is located at the center of the inner contour line 11, and the curved line portion 112 is located at the first straight portion 111. end.
  • the curved line segment 112 at both ends of the first straight portion 111 may be symmetrical with respect to a line passing through the midpoint of the first straight portion 111 and the center point of the rotor core 100. That is, the first straight portion 111 is located at an intermediate position of the inner contour line 11, the midpoint of the first straight portion 111 is the midpoint of the inner contour line 11, and the inner contour line 11 is opposite to the first straight portion 111.
  • the midpoint is linearly symmetrical with the center point of the rotor core 100, thereby facilitating the formation of the magnet slot 1 and the production of the variable frequency rotor.
  • the magnet slot 1 may include at least four, and the plurality of magnet slots 1 are evenly spaced apart from each other along the circumferential direction of the center hole 2. This ensures the performance and reliability of the variable frequency rotor.
  • the magnet groove 1 may include four, and the four magnet grooves 1 are evenly spaced apart from each other in the circumferential direction of the center hole 2.
  • the present invention also proposes a reciprocating compressor having the variable frequency rotor for a reciprocating compressor of the above-described embodiment of the invention.
  • the compressor of the embodiment of the invention since the inverter rotor for a reciprocating compressor of the above embodiment is provided, the compressor of the embodiment of the invention also has the above-described technical effects. That is, according to the compressor of the embodiment of the present invention, by providing the variable frequency rotor for the reciprocating compressor of the above embodiment, the outer diameter D2 of the inverter rotor can be reduced while ensuring that the aperture size d2 of the rotor center hole 2 is not reduced. Thereby, the volume of the compressor can be reduced while ensuring the performance and reliability of the compressor.
  • the first feature "on” or “under” the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact.
  • the first feature "above”, “above” and “above” the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Compressor (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

一种用于往复式压缩机的变频转子和具有其的压缩机，用于往复式压缩机的变频转子包括：转子铁芯（100），转子铁芯（1）上设有中心孔（2）和多个磁体槽（1），每个磁体槽（1）分别大体形成为沿转子铁芯的径向向内弯曲的弧形槽，弧形槽邻近中心孔（2）的一侧轮廓线形成为内轮廓线（11），弧形槽远离中心孔的一侧轮廓线形成为外轮廓线（12），内轮廓线（11）中部的曲率半径大于两端的曲率半径；磁体，磁体适于安装在磁体槽（1）内。

Description

用于往复式压缩机的变频转子和具有其的压缩机 技术领域
本发明涉及压缩机技术领域，尤其涉及一种用于往复式压缩机的变频转子和具有其的压缩机。
背景技术
相关技术的变频往复式制冷压缩机，变频电机主要包括电机定子、转子，其中转子包括转子铁芯和永磁体，转子铁芯中设有永磁体的安装定位槽，为保证转子有较高的磁通量，一般上述的永磁体槽设计成弧型槽或者其他复杂槽型，从而增加了永磁体的体积，如图1所示为现有转子铁芯结构，磁体槽a1为规则弧形。
压缩机运转时，需要足够润滑油，现有的主轴泵油方式为离心泵油，离心泵油的能力往往与主轴的转速、外径有直接联系。变频往复式压缩机有较宽的运转频率，当压缩机处于较低转速运转时，为保证足够的泵油量，则需要较大的主轴外径。
如图1所示，当转子外径D1有一定程度的减少时，设有规则弧型槽a1的转子铁芯中d11则相应的减少，使得转子中心孔孔径d1必须相应的减少，孔径d1的减少可直接导致压缩机在低转速下的泵油能力下降，从而降低压缩机在低转速下各运动副的润滑，严重影响压缩机的可靠性。
发明内容
本发明旨在至少在一定程度上解决相关技术中的技术问题之一。为此，本发明提出了一种用于往复式压缩机的变频转子，所述变频转子能保证变频转子中心孔孔径尺寸不减小的情况下降低转子外径，从而能够在保证性能及可靠性的前提下减小具有其的电机和压缩机的体积。
本发明还提出了一种具有所述用于往复式压缩机的变频转子的压缩机。
根据本发明实施例的用于往复式压缩机的变频转子，包括：转子铁芯，所述转子铁芯上设有沿其轴向贯通的中心孔和设在所述中心孔外周的多个磁体槽，每个所述磁体槽分别大体形成为沿所述转子铁芯的径向向内弯曲的弧形槽，所述弧形槽邻近所述中心孔的一侧轮廓线形成为内轮廓线，所述弧形槽远离所述中心孔的一侧轮廓线形成为外轮廓线，所述内轮廓线中部的曲率半径大于两端的曲率半径；磁体，所述磁体适于安装在所述磁体槽内。
根据本发明实施例的用于往复式压缩机的变频转子，磁体槽的内轮廓线中部的曲率半径大于两端的曲率半径。在保证中心孔的孔径尺寸不减小的情况下，可减小转子铁芯的外径尺 寸。由此，可以保证压缩机在低转速下的泵油能力，在能够保证性能和可靠性的前提下，从而可以减小变频转子的体积，进而减小具有其的电机和压缩机的体积。
另外，根据本发明的用于往复式压缩机的变频转子，还可以具有如下附加的技术特征：
根据本发明的一些实施例，所述内轮廓线的中部形成为第一直线部，所述第一直线部沿垂直于所述转子铁芯的径向延伸。
可选地，至少一个所述磁体槽的外轮廓线设有第二直线部，同一个所述磁体槽的所述第二直线部与所述第一直线部沿所述中心孔的径向间隔开设置且所述第一直线部与所述第二直线部的中点的连线经过所述中心孔的中心。
可选地，每个所述磁体槽的外轮廓线设有所述第二直线部，同一个所述磁体槽的所述第二直线部与所述第一直线部沿所述中心孔的径向间隔开设置且所述第一直线部与所述第二直线部的中点的连线经过所述中心孔的中心。
可选地，同一个所述磁体槽的所述第一直线部的长度与所述第二直线部的长度相等。
可选地，所述内轮廓线的位于所述第一直线部两端的部分分别形成为弧形线段。
进一步地，所述第一直线部两端的所述弧形线段相对于经过所述第一直线部的中点和所述转子铁芯的中心点的直线对称。
根据本发明的一些实施例，所述磁体槽包括至少四个，多个所述磁体槽沿所述中心孔的周向彼此间隔开均匀布置。
此外，本发明还提出了一种往复式压缩机，所述往复式压缩机具有上述发明实施例的用于往复式压缩机的变频转子。
根据本发明实施例的往复式压缩机，由于具有上述实施例的用于往复式压缩机的变频转子，因此本发明实施例的压缩机也具有上述技术效果。即根据本发明实施例的压缩机，通过设置上述实施例的用于往复式压缩机的变频转子，在保证转子中心孔的孔径尺寸不减小的情况下可减小变频转子外径，从而能够在保证压缩机的性能及可靠性的前提下减小具有其的电机和压缩机的体积。
本发明的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。
附图说明
图1是现有技术的用于往复式压缩机的变频转子的转子铁芯的结构示意图；
图2是根据本发明实施例的用于往复式压缩机的变频转子的转子铁芯的结构示意图。
附图标记：
100：转子铁芯；
1：磁体槽，11：内轮廓线，111：第一直线部，112：弧形线段，12：外轮廓线，121：第二直线部；
2：中心孔。
具体实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、““轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接或彼此可通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
下面参考附图描述根据本发明实施例的用于往复式压缩机的变频转子。本发明的用于往复式压缩机的变频转子可应用于小型变频压缩机。
根据本发明实施例的用于往复式压缩机的变频转子可以包括转子铁芯100和磁体(图为示出)。
具体地，转子铁芯100上设有沿其轴向贯通的中心孔2和设在中心孔2外周的多个磁体槽1，每个磁体槽1分别大体形成为沿转子铁芯100的径向向内弯曲的弧形槽，弧形槽邻近中心孔2的一侧轮廓线形成为内轮廓线11，弧形槽远离中心孔2的一侧轮廓线形成为外轮廓线12，内轮廓线11中部的曲率半径大于两端的曲率半径，磁体适于安装在磁体槽1内。
换言之，转子铁芯100与中心孔2同轴设置，中心孔2沿转子铁芯100的轴向贯穿转子铁芯100，多个磁体槽1沿转子铁芯100的周向设置且位于中心孔2的外周，每个磁体槽1形成为大体弧形槽，弧形槽沿转子铁芯100的径向向内弯曲。磁体的形状可与磁体槽1的内 壁面相适配，从而方便磁体与磁体槽1的装配。
如图2所示，弧形槽的轮廓线包括内轮廓线11和外轮廓线12，内轮廓线11邻近中心孔2并朝向中心孔2的方向凸出，外轮廓线12远离中心孔2且朝向中心孔2方向凸出，并沿中心孔2的径向方向位于内轮廓线11的外侧。
如图1所示，传统技术中的用于往复式压缩机的变频转子的磁体槽a1形成为规则的弧形槽，弧形槽的内轮廓线各处曲率是相同的，中心孔的中心到内轮廓线中部的径向尺寸(即如图1所示的d11)较小，中心孔的轮廓线与内轮廓线中部的之间的径向尺寸较小，在减小转子铁芯的外径尺寸时，中心孔的孔径尺寸必须相应减小，从而会影响变频转子的性能，进而降低压缩机在低转速下各运动副的润滑，严重影响压缩机的可靠性。
如图2所示，本发明中内轮廓线11中部的曲率半径大于两端的曲率半径。也就是说，内轮廓线11向内弯曲程度减小，即内轮廓线11的中部到中心孔2的中心点的径向尺寸(即如图2所示的d21)增加，中心孔2的轮廓线与磁体槽1的内轮廓线11的中部的径向尺寸增加。这样，在减小转子铁芯100的外径尺寸(即如图2所示的D2)时，可以不减小中心孔2的孔径尺寸(即如图2所示的d2)。从而可以保证压缩机在低转速下的泵油能力，由此，在能够保证性能和可靠性的前提下，可以减小变频转子的体积，进而减小具有其的电机和压缩机的体积。
根据本发明实施例的用于往复式压缩机的变频转子，磁体槽1的内轮廓线11中部的曲率半径大于两端的曲率半径。在保证中心孔2的孔径尺寸d2不减小的情况下，可降低转子铁芯100的外径尺寸D2。从而可以保证压缩机在低转速下的泵油能力。由此，在能够保证性能和可靠性的前提下，可以减小变频转子的体积，进而减小具有其的电机和压缩机的体积。
根据本发明的一些实施例，内轮廓线11的中部可形成为第一直线部111，第一直线部111沿垂直于转子铁芯100的径向延伸。具体地，内轮廓线11的中部可以形成为直线(即第一直线部111)，内轮廓线11的中部与中心孔2的径向尺寸，即中心孔2的轮廓线最邻近内轮廓线11中心的一点与内轮廓线11的中心的距离，第一直线部111垂直内轮廓线11的中心和中心孔的中心的连线延伸并垂直于转子铁芯100的径向，这里的转子铁芯100的径向即指中心孔2的中心到中心孔2的轮廓线最邻近内轮廓线11的中点的连线所在的径向，第一直线部111与该径向的延长线相垂直。由此，可以进一步地增加内轮廓线11的中部与中心孔2的轮廓线的径向尺寸。需要说明的是，对于第一直线部111的尺寸(即如图2所示的L2)而言，本发明并不作特殊限定。
可选地，至少一个磁体槽1的外轮廓线12可设有第二直线部121，同一个磁体槽1的第二直线部121与第一直线部111沿中心孔2的径向间隔开设置且第一直线部111和第二直线部121的中点的连线经过中心孔2的中心。磁体与磁体槽1相适配，也就是说，磁体的形状 可与磁体槽1的形状相适配，第一直线部111与第二直线部121相平行，在磁体上可形成于第一直线部111和第二直线部121相适配的形状，以使得磁体的厚度可保持大体一致。由此，可使得磁体槽1和磁体的结构更加规则合理。从而以利于磁体槽1的形成和磁体的生产制造。
进一步地，如图2所示，每个磁体槽1的外轮廓线12可分别设有第二直线部121，同一个磁体槽1的第二直线部121与第一直线部111沿中心孔2的径向间隔开设置且第一直线部111和第二直线部121的中点的连线经过中心孔2的中心。具体地，每个磁体槽1上均设有第二直线部121，每个磁体槽1的外轮廓线12的第二直线部121与内轮廓线11的第一直线部111平行且沿中心孔2的径向相对设置且第一直线部111与第二直线部121相平行。
进一步地，同一个磁体槽1的第一直线部111的长度与第二直线部121的长度相等。由此，第一直线部111和第二直线部121之间各处的距离相同，磁体与磁体槽1相适配，可使得磁体上与第一直线部111和第二直线部121相对的部分的厚度保持大体相同。从而方便磁体和变频转子的生产制造，也可保证变频转子的性能和可靠性。
可选地，内轮廓线11的位于第一直线部111两端的部分分别形成为弧形线段112。如图2所示，内轮廓线11包括第一直线部111和弧形线段112，第一直线部111位于内轮廓线11的中部，弧形线段112位于第一直线部111的两端。从而可以减少磁体槽1形状的改变，简化变频转子的制造工艺，而且可保证磁体槽1的体积，有利于磁体槽1和磁体的匹配，进而保证变频转子的性能和可靠性。
进一步地，第一直线部111两端的弧形线段112可相对于经过第一直线部111的中点和转子铁芯100的中心点的直线对称。也就是说，第一直线部111位于内轮廓线11的中间位置，第一直线部111的中点即内轮廓线11的中点，内轮廓线11可相对与第一直线部111的中点和转子铁芯100的中心点的直线对称，从而有利于磁体槽1的形成以及变频转子的生产制造。
在本发明的一些实施例中，磁体槽1可以包括至少四个，多个磁体槽1沿中心孔2的周向彼此间隔开均匀布置。从而可保证变频转子的性能和可靠性。在如图2所示的示例中，磁体槽1可以包括四个，四个磁体槽1沿中心孔2的周向彼此间隔均匀布置。
此外，本发明还提出了一种往复式压缩机，所述往复式压缩机具有上述发明实施例的用于往复式压缩机的变频转子。
根据本发明实施例的往复式压缩机，由于具有上述实施例的用于往复式压缩机的变频转子，因此本发明实施例的压缩机也具有上述技术效果。即根据本发明实施例的压缩机，通过设置上述实施例的用于往复式压缩机的变频转子，在保证转子中心孔2的孔径尺寸d2不减小的情况下可降低变频转子外径D2，从而能够在保证压缩机的性能及可靠性的前提下降低压缩机的体积。
根据本发明实施例的压缩机的其他构成以及操作对于本领域普通技术人员而言都是已知的，这里不再详细描述。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (9)

  1. 一种用于往复式压缩机的变频转子，其特征在于，包括：
    转子铁芯，所述转子铁芯上设有沿其轴向贯通的中心孔和设在所述中心孔外周的多个磁体槽，每个所述磁体槽分别大体形成为沿所述转子铁芯的径向向内弯曲的弧形槽，所述弧形槽邻近所述中心孔的一侧轮廓线形成为内轮廓线，所述弧形槽远离所述中心孔的一侧轮廓线形成为外轮廓线，所述内轮廓线中部的曲率半径大于两端的曲率半径；
    磁体，所述磁体适于安装在所述磁体槽内。
  2. 根据权利要求1所述的用于往复式压缩机的变频转子，其特征在于，所述内轮廓线的中部形成为第一直线部，所述第一直线部沿垂直于所述转子铁芯的径向延伸。
  3. 根据权利要求2所述的用于往复式压缩机的变频转子，其特征在于，至少一个所述磁体槽的外轮廓线设有第二直线部，同一个所述磁体槽的所述第二直线部与所述第一直线部沿所述中心孔的径向间隔开设置且所述第一直线部与所述第二直线部的中点的连线经过所述中心孔的中心。
  4. 根据权利要求3所述的用于往复式压缩机的变频转子，其特征在于，每个所述磁体槽的外轮廓线设有所述第二直线部，同一个所述磁体槽的所述第二直线部与所述第一直线部沿所述中心孔的径向间隔开设置且所述第一直线部与所述第二直线部的中点的连线经过所述中心孔的中心。
  5. 根据权利要求3所述的用于往复式压缩机的变频转子，其特征在于，同一个所述磁体槽的所述第一直线部的长度与所述第二直线部的长度相等。
  6. 根据权利要求2所述的用于往复式压缩机的变频转子，其特征在于，所述内轮廓线的位于所述第一直线部两端的部分分别形成为弧形线段。
  7. 根据权利要求6所述的用于往复式压缩机的变频转子，其特征在于，所述第一直线部两端的所述弧形线段相对于经过所述第一直线部的中点和所述转子铁芯的中心点的直线对称。
  8. 根据权利要求1-7中任一项所述的用于往复式压缩机的变频转子，其特征在于，所述磁体槽包括至少四个，多个所述磁体槽沿所述中心孔的周向彼此间隔开均匀布置。
  9. 一种往复式压缩机，其特征在于，包括权利要求1-8中任一项所述的用于往复式压缩机的变频转子。
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