CN110177946B - 涡旋压缩机 - Google Patents
涡旋压缩机 Download PDFInfo
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Abstract
本发明提供涡旋压缩机,能够降低轴电压且能够实现装置整体的省空间化。涡旋压缩机(100)具有:收纳于电机壳(14)内的转子(32);收纳于电机壳(14)内的旋转驱动转子(32)的定子(31);被轴承(33、34)保持且与转子(32)一体旋转的旋转轴(12);端架(16),使旋转轴(12)的一端部贯通其中,封闭电机壳(14);旋转涡旋件(44),支承旋转轴(12)的另一端部,通过旋转轴(12)的旋转进行旋转运动;固定涡旋件(43),与旋转涡旋件(44)相对配置;吸入式的冷却风扇(13),与端架(16)之间保持间隔地固定于旋转轴(12)的一端部,通过收纳于风扇罩(132)内部的旋转叶片(131)的旋转,从设于风扇罩(132)的端面(132A)的吸入口吸入外部空气,使得在风扇罩(132)内部产生冷却固定涡旋件(43)或旋转涡旋件(44)的冷却风;除电刷(60),其固定于与冷却风扇(13)相对的端架(16),一端与旋转轴(12)接触。
Description
技术领域
本发明涉及涡旋压缩机。
背景技术
目前,多使用与电机一体化的涡旋式压缩机。在电机一体型的涡旋式压缩机中,通常,为了冷却在工作时变为高温的压缩部,在电机旋转轴安装有冷却风扇。
在驱动压缩机的电机中,轴承电蚀成为问题。例如,在使用逆变电源使电机可变速运转时,由于在旋转轴上产生的轴电压,存在容易产生轴承电蚀的趋势。由于伴随轴承电蚀的发生,会产生轴承寿命缩短等弊端,因此为了防止这种情况,要求降低电机的轴电压。
例如在专利文献1中公开了一种轴向间隙型永磁体同步电机,其通过使安装于风扇罩的电刷架内的电刷与设于端架的轴向端部的径向风扇的端面接触,实现电机的轴电压的降低。
现有技术文献
专利文献
专利文献1:日本特开2015-50798号公报
发明内容
发明要解决的技术问题
在专利文献1所记载的结构中,为了使与径向风扇接触的电刷与接地电位电结合,需要使安装电刷架的风扇罩与外壳导通。因此,在设计上,整体容易大型化。
因此,本发明的目的在于提供一种涡旋压缩机,其能够降低轴电压且能够节省空间。
用于解决问题的技术方案
作为本发明的涡旋压缩机优选的实施方式,其特征在于,具有:转子,其收纳于电机壳内;定子,其收纳于所述电机壳内,旋转驱动所述转子;旋转轴,其被轴承保持且与所述转子一体旋转;端架,其供所述旋转轴的一端部贯通,封闭所述电机壳;旋转涡旋件,其支承所述旋转轴的另一端部,通过该旋转轴的旋转进行旋转运动;固定涡旋件,其与所述旋转涡旋件相对配置;吸入式的冷却风扇,其与所述端架之间保持间隔地固定于所述旋转轴的一端部,通过收纳于风扇罩内部的旋转叶片的旋转,从设于所述风扇罩的与所述端架相对的端面的吸入口吸入外部空气,使得在所述风扇罩内部产生冷却所述固定涡旋件或所述旋转涡旋件的冷却风;除电刷,其固定于与所述冷却风扇相对的所述端架,一端与所述旋转轴接触。
发明效果
根据本发明,能够实现一种涡旋压缩机,其能够降低轴电压且能够节省空间。
附图说明
图1是从侧面观察实施例的涡旋压缩机100的截面图。
图2是放大表示图1所示的电机10的定子31和转子32的图。
图3是实施例的涡旋压缩机100的侧面图。
具体实施方式
实施例
图1中示出从侧面观察实施例的涡旋压缩机100的截面图。涡旋压缩机100具有电机10和由电机10驱动的压缩部110。在以下的说明中,对将轴向间隙型电机作为电机10应用时的结构的例子进行说明。
在电机10的电机壳14内,圆盘状的定子31被圆盘状的一对转子32夹着而配置。电机壳14例如为Al等金属制成,具有在两端具有开口部的圆筒形状。在电机壳14的压缩部110侧的开口部设有金属制的凸缘15,在与该开口部相反的一侧的开口部设有金属制的端架16,两开口部被封闭。
旋转轴12贯通定子31和转子32的中央部地设置。旋转轴12被主轴承33和反负载轴承34可旋转地支承,该主轴承33设于压缩部110侧,该反负载轴承34隔着定子31设于与主轴承33相反的一侧。主轴承33被凸缘15保持,反负载轴承34被端架16保持。旋转轴12在主轴承33侧的端部具有偏心部12a。
旋转轴12的反负载轴承34侧的端部贯通在端架16中,在其端部侧设置有冷却风扇13。冷却风扇13通过将安装于旋转轴12的旋转叶片131收纳于树脂制的风扇罩132内而构成。在旋转轴12的端部,在旋转叶片131与风扇罩132之间设有配重135。
冷却风扇13为了确保进气用的空间20,以在与端架16之间保持规定的距离D的间隔的方式设置。
此处,距离D指的是端架16的与冷却风扇13相对的表面161(以下,简称为端架16的表面161)、与风扇罩132的与端架16相对的端面132A(以下,简称为风扇罩132的端面132A)之间的距离。
冷却风扇13为所谓的吸入式的冷却风扇,其通过由旋转轴12驱动的旋转叶片131的旋转,从设于端面132A吸入孔(省略图示)吸入从冷却风扇的侧面向空间20流入的外部空气,产生冷却风。
向空间20流入的冷却风扇13周边的外部空气的大部分从冷却风扇13的外径侧的吸入口被吸入到冷却风扇13内部。通过旋转叶片131的旋转而在风扇罩132内部产生的冷却风,通过未图示的管道向压缩部110的后述的固定涡旋件43或旋转涡旋件44供给。
定子31与转子32之间形成有空隙。由此,定子31和转子32以在与旋转轴12平行的方向上隔开空隙地相对配置的状态收纳于电机壳14内。
在图2中放大表示了图1所示的电机10的定子31和转子32。转子32包括由磁性体构成的轭部(省略图示)和在周向配置且与轭部连接的永磁体321。
定子31在周向上等间隔地配置有多个铁芯件311。在铁芯件311隔着非磁性体卷绕有线圈312。在周向配置的铁芯件311通过由树脂材料进行树脂模制而一体成形,固定于电机壳14。铁芯件311能够由例如电磁钢板或非晶态金属构成。
当在卷绕于定子31的铁芯件311的线圈312有电流流动,则通过在定子31和转子32产生的磁场对转子32赋予旋转力。旋转轴12伴随转子32的旋转而旋转。
在由非晶态金属形成铁芯件311时,由于与其它的磁性材料相比,损失大幅度降低且导磁率提高,因此能够得到高的电机效率。另一方面,由于非晶态金属除了金属自身的硬度高且脆之外,还使较厚的板厚变薄来使用,因此不适合冲压等的加工。在轴向间隙型电机中,能够由将能够比较容易地制作的扇形形状(参照图2)的箔带叠层而得的铁芯件311构成定子31。因此,轴向间隙型电机能够不进行复杂的形状的冲压加工地制作定子31,因此适合非晶态金属的使用。
在端架16的表面161,在旋转轴12的轴贯通部162形成有与旋转轴12的轴向垂直的端面162a,在该端面162a固定有除电刷60。
图3(a)中示出图1所示的涡旋压缩机100的侧面图,在图3(b)中放大表示了图3(a)所示的除电刷60和其周边部分。除电刷60例如为碳刷,如图3(b)所示,用轴贯通部162的端面162a内的插入螺栓61的螺纹部62按压其上端面,由此下端面与旋转轴12的表面压接。
例如在电机驱动时,在使用逆变电源使电流在线圈312中流动时,当使旋转轴12高速旋转时,在旋转轴12产生轴电压。如图1所示,主轴承33或反负载轴承34等轴承被凸缘15或端架16保持,这些轴承的轴承内圈与旋转轴12接触,轴承外圈与凸缘15或端架16接触。因此,如上所述,当在旋转轴12产生轴电压时,在轴承的内外圈之间产生凸缘15或端架16与旋转轴12的电位差。当该电位差超过轴承油膜的介电强度(绝缘耐力)时,由于油膜绝缘击穿而导致轴承电流流动,产生轴承电蚀。
如上所述,实施例的涡旋压缩机100能够通过使除电刷60与旋转轴12的表面接触而接地,从而经由除电刷60将在旋转轴12产生的电流从螺栓61和螺纹部62向端架16、电机壳14释放,降低轴电压。因此,能够抑制轴承电蚀的产生。此外,在除电刷60的固定中,除了螺栓61、螺纹部(例如螺钉、螺母)62,例如也可以使用弹簧。
特别是在轴向间隙型电机中,由于定子31和转子32的相对面积大,因此电容容易变大。因此,例如与径向间隙型电机相比,在轴向间隙型电机中,在旋转轴12容易产生更高的轴电压,轴承电蚀的发生变得更加显著。
如上所述,在实施例的涡旋压缩机100中,由于将固定于端架的除电刷60压接于旋转轴12,因此即使在旋转轴12产生高的轴电压时,也能够降低该轴电压,抑制轴承电蚀的产生。
在图1和图3所示的例子中,除电刷60和将其固定的螺纹部62以露出到涡旋压缩机100的外部的方式设置。具体来说,以从电机10和冷却风扇13的外径侧观察端架16与冷却风扇13之间的空间20时能够辨识的方式,设置螺纹部62的头部。
在图1和图3所示的例子中,端架16的表面161与风扇罩132的端面132A之间的距离D,能够确保在冷却风扇13中为了使冷却风产生而需要的外部空气的吸入量,并且确保能够将例如改锥等工具从涡旋压缩机100的外部插入到空间20的大小。
因此,为了进行例如除电刷60的更换或修理,在从端架16拆除除电刷60时,进行从电机10和冷却风扇13的外径侧向空间20直接插入改锥等工具、将露出到外部的螺纹部62拧松等操作,由此能够不拆除端架16或风扇罩132地将除电刷60容易地拆除。因此,与在电机壳14内或风扇罩132内设置除电刷60的结构相比,能够提高除电刷60的维护性。
如图1所示,压缩部110具有固定涡旋件43和与固定涡旋件43相对配置的旋转涡旋件44。固定涡旋件43和旋转涡旋件44收纳于主体壳41内。
主体壳41为在两端具有开口部的筒状体,在一个开口部安装固定涡旋件43,在另一个开口部安装电机10。
固定涡旋件43和旋转涡旋件44分别在盖板43A、44A的表面形成有涡旋状的搭接部(lap,涡旋齿部)43B、44B。通过固定涡旋件43的搭接部43B与旋转涡旋件44的搭接部44B互相啮合,形成压缩室45。在固定涡旋件43的搭接部43B和旋转涡旋件44的搭接部44B,在各自的前端设置有片状密封43C、44C。
在旋转涡旋件44的背面,在毂部46设有旋转轴承47。旋转轴12的偏心部12a插入到旋转轴承47中,由此旋转轴12的偏心部12a由旋转涡旋件44支承。
旋转轴12的偏心部12a伴随旋转轴12的旋转运动而进行偏心运动。由此,当旋转轴12被电机10旋转驱动时,与偏心部12a连接的旋转涡旋件44进行旋转运动。
通过安装于旋转轴12的端部的配重135的旋转,消除旋转涡旋件44的偏心,由此旋转涡旋件44的旋转运动持续进行。
当旋转涡旋件44进行旋转运动时,在固定涡旋件43的搭接部43B与旋转涡旋件44的搭接部44B之间划分出的压缩室45连续地缩小。由此,向压缩室45内导入的流体被压缩,压缩空气向压缩部110的外部排出。此外,虽然省略了图示,多个压缩室45的其中之一成为流体的吸入口,多个压缩室45的其中之一成为压缩流体的排出口。
根据以上说明的实施例的涡旋压缩机100,通过在端架16的表面161固定地设置除电刷60,能够有效地利用为了外部空气的吸入而确保出的空间20。如上所述,由于从空间20流入的外部空气的大部分从冷却风扇13的外径侧的吸入口被吸入,因此空间20中的内径侧的区域21几乎没有为外部空气的进气做出贡献,实质上为死区。根据实施例的涡旋压缩机100,通过将除电刷60固定地设置于端架16的表面161,能够有效地利用空间20中的死区即区域21。因此,能够抑制由轴承电蚀导致的故障等弊端,且实现压缩机整体的小型化,节省空间。
另外,端架16的与冷却风扇13之间的空间20在内径侧的区域21中也有一定程度的外部空气通过。因此,通过在该区域21设置除电刷60,除电刷60的滑动面被外部空气冷却。因此,能够延长除电刷60的电刷寿命。
另外,根据实施例的涡旋压缩机100,即使在旋转轴12产生高的轴电压时,也能够利用除电刷60降低该轴电压。因此,利用在定子31使用非晶合金的轴向间隙型电机能够得到高的电机效率,并且能够抑制由轴承电蚀导致的故障等弊端。
另外,根据实施例的涡旋压缩机100,由于将除电刷60固定设置于端架16的表面161,因此能够将配重135设置于冷却风扇13侧的旋转轴12端部。因此,能够降低抵消旋转轴12的偏心所需的配重135的重量,能够将配重135轻量化。
即,在现有的将除电刷设置于旋转轴的端部的结构中,不能将配重135设置于旋转轴12的端部,需要在比旋转轴12的端部靠中心的位置设置配重135。此时,抵消旋转轴12的偏心所需的配重135的重量变重。
另外,根据实施例的涡旋压缩机100,由于将除电刷60固定设置于端架16的表面161,因此不需要使风扇罩132与除电刷60或电机壳14导通。因此,能够将树脂制的罩作为风扇罩132使用,能够降低涡旋压缩机100的制造成本,或者能够将涡旋压缩机100整体轻量化。
即,在使除电刷与风扇罩接触地设置的现有结构中,需要将金属制的物体用作风扇罩,因此制造成本提高。
此外,在实施例的涡旋压缩机100中,风扇罩132不必限于树脂制的物体,也可以采用金属制的罩。
在以上说明的实施例的涡旋压缩机100中,以使用轴向间隙型的电机10的结构为例进行了说明。但是,不限于此,例如也可以使用径向间隙型电机等其它结构的电机作为电机10。
附图标记说明
100……涡旋压缩机,10……电机,110……压缩部,12……旋转轴,12a……偏心部,13……冷却风扇,131……旋转叶片,132……风扇罩,132A……端面,135……配重,14……电机壳,15……凸缘,16……端架,161……表面,162……轴贯通部,162a……端面,20……空间,21……区域,31……定子,311……铁芯件,312……线圈,32……转子,321……永磁体,33……主轴承,34……反负载轴承,41……主体壳,43……固定涡旋件,44……旋转涡旋件,43A、44A……盖板,43B、44B……涡卷状的搭接部,43C、44C……片状密封,45……压缩室,46……毂部,47……旋转轴承,60……除电刷,61……螺栓,62……螺纹部,D……距离。
Claims (4)
1.一种涡旋压缩机,其特征在于,具有:
收纳于电机壳内的转子;
收纳于所述电机壳内的、对所述转子进行旋转驱动的定子;
被轴承保持的与所述转子一体地旋转的旋转轴;
端架,其供所述旋转轴的一端部贯通,且封闭所述电机壳;
旋转涡旋件,其支承所述旋转轴的另一端部,因该旋转轴的旋转而进行旋转运动;
固定涡旋件,其与所述旋转涡旋件相对配置;
吸入式的冷却风扇,其与所述端架之间保持间隔地固定于所述旋转轴的一端部,通过收纳于风扇罩内部的旋转叶片的旋转,从设置于所述风扇罩的与所述端架相对的端面的吸入口吸入外部空气,使得在所述风扇罩内部产生冷却所述固定涡旋件或所述旋转涡旋件的冷却风;和
除电刷,在由所述间隔所确保的空间中,利用相对于所述旋转轴从径向安装的固定部件固定于与所述冷却风扇相对的所述端架,且其一端与所述旋转轴接触,
所述除电刷和所述固定部件在所述空间中露出到外部,
所述间隔是能够确保在所述冷却风扇中为了使冷却风产生而需要的外部空气的吸入量,并且确保能够将用于拆装所述除电刷的工具从所述涡旋压缩机的外部插入到所述空间的大小。
2.根据权利要求1所述的涡旋压缩机,其特征在于:
在所述旋转轴的所述冷却风扇侧的端部设置有配重。
3.根据权利要求1所述的涡旋压缩机,其特征在于,
所述定子在周向上配置有多个卷绕有线圈的铁芯件,
所述定子和所述转子在与所述旋转轴平行的方向上隔开空隙地相对配置。
4.根据权利要求3所述的涡旋压缩机,其特征在于:
所述铁芯件由非晶态金属形成。
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CN2556824Y (zh) | 2002-07-09 | 2003-06-18 | 永济电机厂 | 接地电刷装置 |
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