CN111550406B - 螺杆转子及制造螺杆转子的方法 - Google Patents

螺杆转子及制造螺杆转子的方法 Download PDF

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CN111550406B
CN111550406B CN202010087634.0A CN202010087634A CN111550406B CN 111550406 B CN111550406 B CN 111550406B CN 202010087634 A CN202010087634 A CN 202010087634A CN 111550406 B CN111550406 B CN 111550406B
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shaft
polymer
rotor body
rotor
screw rotor
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CN111550406A (zh
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K·A·L·马林
P·米歇尔
P·希尔施
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Atlas Copco Airpower NV
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    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/10Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth equivalents, e.g. rollers, than the inner member
    • F04C18/107Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth equivalents, e.g. rollers, than the inner member with helical teeth
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    • F04C18/12Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
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    • F04C29/00Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/0078Fixing rotors on shafts, e.g. by clamping together hub and shaft
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Abstract

本发明涉及螺杆转子及制造螺杆转子的方法。一种螺杆转子,其特征在于,螺杆转子(1)由聚合物制成,螺杆转子(1)由轴(2)和在轴(2)上的转子主体(3)组成,轴(2)的聚合物用纤维(4)增强,轴(2)具有与转子主体(3)接合或与转子主体(3)上的相应元件(5c)接合的元件(5a,5b),从而这些元件(5a,5b,5c)防止轴(2)相对于转子主体(3)轴向运动和/或旋转运动。

Description

螺杆转子及制造螺杆转子的方法
技术领域
本发明涉及螺杆转子。
更具体地,根据本发明的螺杆转子旨在用于流体注入式压缩机、膨胀机和真空泵。
背景技术
已知这样的螺杆转子传统上由铸铁或钢制成,铸造成原始螺杆形或锻造成原始圆柱形,然后通过粗磨和精磨、锉削、铣削和其他切削操作对(具有螺杆轮廓的)螺杆转子的轴及转子主体进行精加工,获得了最终的成品螺杆形。
该精加工是必要的,因为铸造工艺无法获得在允许最终机器正常运行所需的非常精细公差范围内的形状。
即使这种常规的螺杆转子能正常工作,但通过磨削、锉削、铣削和其他类似工艺进行精加工也是非常费力费时的。
此外,所有这些会导致成本增加。
另一个缺点是,在精加工过程中要机加工掉很多材料,这会造成原材料的损失或浪费。
另一个缺点是,由于使用铸铁或钢,这种常规螺杆转子的重量很大。
发明内容
本发明的任务是提供一种对前述缺点和其他缺点中至少一个缺点的解决方案。
本发明的主题是一种螺杆转子,其特征在于,螺杆转子由聚合物制成,螺杆转子由具有转子主体的轴组成,轴的聚合物用纤维增强,轴具有与转子主体接合或与转子主体中相应元件接合的元件,从而这些元件防止轴相对于转子主体的轴向运动和/或旋转运动。
通过使用聚合物,螺杆转子不仅比传统金属螺杆转子更轻,而且将更耐腐蚀,并且更容易制造成复合形式。
这种螺杆转子例如可以通过注塑成型工艺来制造,以允许制造出已经非常接近最终精加工螺杆形状的初始螺杆形状,从而使得把该初始螺杆最终形成为处于要求公差范围内所需的切削操作进行精加工将会非常有限,或者可以根本没有必要。
此外,复合螺杆转子的加工比铸铁或钢螺杆转子的加工简单容易得多。
这意味着精加工所需的工作量和时间要少得多,从而将大大节省成本。
此外,由于起点的初始螺杆形状就已非常接近最终形状,因此损失的材料更少。
虽然对于本发明必要的是仅轴采用纤维增强聚合物,但也不排除转子主体也由纤维增强聚合物制造。
轴的元件是进入或离开轴表面的轴偏离部,即朝向轴中心线或离开轴中心线的偏离部。
轴的元件以及转子主体上或转子主体中的相应或匹配元件会在轴和转子主体之间产生机械阻挡,因此轴向力和扭矩可从轴传递到转子主体或从转子主体传递到轴。尽管元件可以布置在轴本身上,但轴的元件也可以通过布置在轴上指定凹部中的中间体或键来形成。
优选地,轴中的纤维主要在轴向上延伸。这将为轴提供必要的刚性和强度。
众所周知,例如在螺杆压缩机的螺杆转子中,在螺杆转子上施加了非常强的轴向力和气体力,因此,轴具有必要的刚性是至关重要的。
转子主体可以由两个或更多个同心层组成,其中,内层具有与另一层接合的元件,从而该元件防止一层相对于另一层的轴向运动和/或旋转运动。
这将特别适用于通过注塑成型制造更大的螺杆转子,使得每层的最大厚度为八毫米。
通过以多个步骤或阶段来注塑成型转子主体,可以限制在每个步骤或阶段中添加的材料量,从而可以更容易地监视注塑成型过程和随后的冷却过程。这将有助于优化螺杆转子的最终机械性能。这些元件与轴的前述元件相似并且具有相同的功能。
本发明的主题还在于一种用于制造螺杆转子的方法,螺杆转子由轴和转子主体组成,其特征在于,螺杆转子由聚合物制成,并且该方法包括以下步骤:
A:提供轴;
B:采用指定的模具对转子主体进行注塑成型,其中,采用上述轴作为模具中的插入件。
通过在至少两个步骤中执行注塑成型过程,与在单个步骤中注塑成型螺杆转子的注塑成型过程相比,步骤B的注塑成型过程将更加容易,尤其是在材料收缩、尺寸和机械性能方面,在根据本发明这样的多步工艺中更易于监测。
另一个优点是,通过将轴用作转子主体模具中的插入件,转子主体铸造到轴上或围绕轴铸造,因而转子主体铸件在轴和转子主体之间产生了热结合。
这将确保轴不能相对于转子主体运动,这是因为通过转子主体的注塑成型轴表面将会因与注入到模具中的热熔融纤维增强聚合物相接触而再次升温,从而使轴与围绕轴铸造的转子主体材料产生热结合。
附图说明
为了更好地说明本发明的特征,下面参考附图在非限制性描述的情况下来描述根据本发明用于制造螺杆转子的方法的一些优选变型例,其中:
图1示出了根据本发明的螺杆转子的一种可行实施例的示意性透视图。
图2示出了图1的螺杆转子的轴。
图3示意性地示出了沿图2中的线III-III的横截面。
图4示意性地示出了沿图1中的线IV-IV的横截面。
图5、图6和图7示意性示出了图2的变型实施例。
具体实施方式
在图1中示意性地示出了根据本发明的螺杆转子1,其由轴2和在轴2上的转子主体3构成。
螺杆转子1可以用在流体注入式压缩机、膨胀机或真空泵中。
在所示的示例中,转子主体3为圆柱形。但是,也不排除转子主体3为圆锥形。使用圆锥形转子的优点是力可以更好地分布并且可以增大压缩。
在图2中,单独示出了轴2。
根据本发明,螺杆转子1由聚合物制成。
在这种情况下,对于本发明而言,至少轴2是由用纤维4增强的聚合物制成,转子主体3可以由不具有纤维4的聚合物制成,但是在这里示出和下面描述的示例中,转子主体3也由用纤维4增强的聚合物制成。
聚合物可以是例如聚酰胺或聚酰亚胺。然而,本发明不限于此。例如,聚合物也可以是聚醚醚酮(PEEK)。
聚合物也可以是热固性聚合物,例如环氧树脂、乙烯基酯或不饱和聚酯。
纤维4优选地但非必须地包括碳纤维或玻璃纤维。例如,纤维也可以包括有机聚合物,例如芳族聚酰胺纤维。碳纳米管也是可以的。
在一可行的实施例中,用纤维4增强的聚合物是所谓的自增强聚合物,其中,纤维由与模具相同的聚合物制成。
优选地,是用重量百分比为10%至60%的纤维4增强的聚酰胺、聚酰亚胺或PEEK聚合物。优选地,纤维的重量百分比在25%至45%之间。
不排除的是:轴2由与转子主体3不同的聚合物制成,其中,转子主体3可以由可用纤维4增强的聚合物制成或可以由不用纤维4增强的聚合物制成。
因此,例如,轴2的用纤维4增强的聚合物可以具有与转子主体3的用纤维4增强的聚合物相同或更高的软化温度。
各个不同层的软化温度之差优选在0至20摄氏度之间变化。
如将在下文中阐明的,这将尤其在螺杆转子1的生产或制造方面带来益处。
在这种情况下,对于本发明来说不是必须的,轴2中的纤维4主要沿轴向X-X'延伸。
这在图3的剖视图中示意性地示出。
由于纤维4的这种取向,轴2将具有必要的刚性。众所周知,在机器的运转过程中,在螺杆转子1的安装位置处轴2承受很强的轴向力和气体力。
如图3所示,轴2是实心的轴2。不排除轴2可以是空心的,这意味着纵向空腔贯穿轴2。这将防止在轴2的生产中出现所谓的流动问题。
在这种情况下,但不是必须的,转子主体3中的纤维4是任意地或随机地定向。
根据本发明,如图2、图3和图4清楚所示,轴2具有元件5a,5b。
这些元件中的一些元件5a可以接合转子主体3,这些元件中的一些元件5b可以接合转子主体3中的相应元件5c,它们都设计成使得元件5a,5b,5c防止轴2相对于转子主体3的轴向运动和/或旋转运动。
将通过附图对此进行解释。
如图2和图3中所示,轴2具有呈环形突起形式的两个元件5a,其中,沿轴向X-X'在轴2上的投影是旋转对称的并且与轴2的中心线X-X'同轴。
旋转对称是指:围绕中心线旋转重复的部分或片段。
虽然在这种情况下这些元件5a属于环形突起,但这些元件5a也可以包括不同形状的突起、凹槽或环。
这些元件5a可以与转子主体3本身接合,如图1所示。
这样的元件5a将能够将轴向力从轴2传递到转子主体3,或将轴向力从转子主体3传递到轴2。
实际上,它们构成了在轴2上对于转子主体3而言的止挡部或在转子主体3上对于轴2而言的止挡部,从而当轴向力施加到转子主体3上时轴向力可以经由该止挡部传递到轴2上。
不排除这些元件5a布置在更远离轴2端部6的不同位置处。在这种情况下,这些元件5a将不与转子主体3本身接合,而是与转子主体3的对应元件5c接合。
此外,轴2还具有多个元件5b,这些元件5b可以接合转子主体3的相应元件5c。
在这种情况下,这些元件5b属于沿轴2的轴向X-X'的突起,导致轴2的横截面为六边形。
这些元件5b在轴2上所处的位置使得转子主体3布置在其上,例如根据图1和图2的比较可知。
如图4所示,转子主体3具有与轴2的元件5b接合的对应元件5c。
借助这些元件5b,5c,扭矩可以从轴2传递到转子主体3。这尤其对于通过马达借助轴2驱动螺杆转子1是特别相关的。
代替沿轴向X-X'延伸的突起,也可以使用凹槽,环或类似物作为元件5b,5c。
如图1和图2所示,在这种情况下,轴2在其端面7处具有联接件8,该联接件8具有螺纹9,螺栓可以布置在其上。
借助于该螺栓,轴2可以例如连接至马达驱动轴或类似物。
虽然在所示示例中,螺杆转子1由带有转子主体3的轴2构成,但也不排除转子主体3本身由两个或更多个同心层组成,其中,内层具有与其它层接合的元件5b,5c,从而元件5b,5c防止了一层相对于另一层的轴向移动和/或旋转运动。
换句话说,该原理在本质上与如上所述的轴2和转子主体3的原理非常相似。
在大的螺杆转子1的情况下,这尤其在生产过程中将是有利的,这将在下面说明。
可以根据本发明的方法来制造图1至图4的螺杆转子。
通过注塑成型来生产由用纤维增强的聚合物制成的螺杆转子1的生产方法大体上包括两个步骤:
A)提供轴;
B)采用指定的模具对转子主体3进行注塑成型,其中,采用上述轴2作为模具中的插入件。
优选但非必须地,上述步骤A包括采用指定的模具对螺杆转子1的轴2进行注塑成型。
但是,这对于本发明不是必须的。轴2例如也可以挤压成型。
在步骤A中,对于轴2的注塑成型来说,这里将采用具有元件5a,5b的模具,以便在轴2上形成上述元件5a,5b。
为了确保纤维4在轴2中沿轴向X-X'延伸,可以把用纤维4增强的聚合物沿轴向X-X'注入模具中。
然后通过采用轴2作为转子主体3的模具中的插入物,相应的元件5c将有效地自动地形成在转子主体3中。
通过使用于轴2的纤维4增强聚合物与用于转子主体3的纤维4增强聚合物彼此不同以使用于轴2的纤维4增强聚合物的软化温度与用于转子主体3的聚合物的软化温度相同或更高,当转子主体3围绕轴2铸造时整个轴2不会熔化或软化。这样,轴2的机械性能保持完整,并且如果轴2的聚合物稍微软化也可以防止轴2的纤维4丧失取向。
不排除的是:对于步骤B,转子主体3的注塑成型以两个或更多个步骤执行,在每个步骤中,通过使用相继的模具来将更多的材料添加到转子主体3,其中,前一步骤中制造的转子主体部分用作后一个模具中的插入件。
因此,转子主体3本身可以由两个或更多个同心层制成,其中,采用带有元件5c的模具可以使元件5c形成在内层上,以与围绕内层铸造的下一层接合。
该方法对于大的螺杆转子1是特别有利的,因为这可以使所添加的材料在每个步骤中受到更多的限制,从而可以监控冷却,以便不产生机械张力或产生更少的机械张力。
如果转子主体3为圆锥形,则优点是可以更容易地脱模,即从模具中取出。
为了将前述的联接件8插入到轴2的端面7中,将联接件8布置在轴2的模具中处于轴2的相应端面7的位置处。
因此,联接件8可以在铸造过程中集成到轴2中。
可替代地,在步骤B之后,可以通过自攻将上述联接件8布置在轴2的端面7中的指定腔中。
应该理解的是,在图1至图5所示和所描述的示例中,仅示出了元件5a,5b的可行实施例的一些可行示例。
在图5中示出了另一种可行实施例,其中,元件5a,5b包括至少一个突起5b,围绕轴2呈螺旋形。
代替突起,也可以是螺旋形凹槽。
突起或元件5b在轴2上所处的位置可供转子主体3布置在其上,以便在注塑成型过程中在转子主体3中形成相应的元件。
螺旋形元件5b将能够传递旋转力和轴向力的组合,以防止轴2相对于转子主体3的轴向运动和旋转运动。
图6示出了另一实施例,其中,轴2具有元件5b,该元件5b可以接合转子主体3的相应元件5c。
在这种情况下,该元件5b是围绕轴2的环形突起。
该元件5b在轴2上所处的位置可供转子主体3布置在其上。该元件5b将能够将轴向力从轴2传递到转子主体3,或将轴向力从转子主体3传递到轴2。
图7示出了另一种变型,其中,轴2具有呈细长突起形的多个元件5b,它们沿着轴2在轴向上延伸并且围绕轴2分布。
基于上述各变型可看出,元件5a,5b可以以各种方式实施,并且所示的示例不以任何方式进行限制。
本发明决不限于在附图中描述和示出的示例性实施例。相反,在不偏离本发明范围的情况下,可以以各种不同的变型来实现根据本发明的方法和螺杆转子。

Claims (14)

1.一种螺杆转子,其特征在于,螺杆转子(1)由聚合物制成,螺杆转子(1)由轴(2)和轴(2)上的转子主体(3)构成,轴(2)的聚合物由纤维(4)增强,轴(2)具有与转子主体(3)接合或与转子主体(3)中的相应元件(5c)接合的元件(5a,5b),从而轴的元件(5a,5b)和转子主体的元件(5c)防止了轴(2)相对于转子主体(3)的轴向运动和/或旋转运动;其中,轴的元件包括:邻近轴的两端设置的两个环形凹槽或突起,沿轴向(X-X')在垂直于轴(2)的表面上的投影是旋转对称的并与轴(2)的中心线同轴,构成了在轴上对于转子主体而言的止挡部,从而当轴向力施加到转子主体上时轴向力经由止挡部传递到轴上;以及设置在所述两个环形凹槽或突起之间并且围绕轴(2)呈螺旋形的一个连续的凹槽或突起,能够传递旋转力和轴向力的组合;其中,轴(2)由与转子主体(3)不同的聚合物制成,轴(2)的聚合物的软化温度与转子主体(3)的聚合物的软化温度相同或更高。
2.根据权利要求1所述的螺杆转子,其特征在于,转子主体(3)的形状是圆柱形或圆锥形。
3.根据权利要求1所述的螺杆转子,其特征在于,轴(2)是空心的。
4.根据权利要求1所述的螺杆转子,其特征在于,轴(2)中的纤维(4)主要在轴向(X-X')上延伸。
5.根据权利要求1所述的螺杆转子,其特征在于,转子主体(3)至少部分地由用纤维(4)增强的聚合物制成。
6.根据权利要求5所述的螺杆转子,其特征在于,转子主体(3)中的纤维(4)是任意取向或随机取向的。
7.根据权利要求1所述的螺杆转子,其特征在于,聚合物是聚酰胺、聚酰亚胺或PEEK。
8.根据权利要求1所述的螺杆转子,其特征在于,聚合物是热固性聚合物,或聚合物是环氧树脂、乙烯基酯或不饱和聚酯。
9.根据权利要求1所述的螺杆转子,其特征在于,纤维(4)包括碳纤维或玻璃纤维。
10.根据权利要求1所述的螺杆转子,其特征在于,纤维(4)包括有机聚合物。
11.根据权利要求10所述的螺杆转子,其特征在于,由有机聚合物制成的纤维(4)是芳族聚酰胺纤维。
12.根据权利要求1所述的螺杆转子,其特征在于,聚合物是芳族聚酰胺纤维在芳族聚酰胺聚合物基体中的自增强聚合物。
13.根据权利要求1所述的螺杆转子,其特征在于,轴(2)在端面(7)的位置处具有联接件(8),联接件具有螺纹(9),螺栓能够设置在螺纹中。
14.根据权利要求1所述的螺杆转子,其特征在于,转子主体(3)由两个或更多个同心层组成,其中,内层具有与另一层接合的转子主体元件(5c),从而转子主体元件(5c)防止了一层相对于另一层的轴向运动和/或旋转运动。
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