CN1054188C - 内部具有聚四氟乙烯轴衬的聚醚醚酮轴承 - Google Patents

内部具有聚四氟乙烯轴衬的聚醚醚酮轴承 Download PDF

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CN1054188C
CN1054188C CN95193935A CN95193935A CN1054188C CN 1054188 C CN1054188 C CN 1054188C CN 95193935 A CN95193935 A CN 95193935A CN 95193935 A CN95193935 A CN 95193935A CN 1054188 C CN1054188 C CN 1054188C
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罗伯特·T·威尔逊
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02Parts of sliding-contact bearings
    • F16C33/04Brasses; Bushes; Linings
    • F16C33/20Sliding surface consisting mainly of plastics
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20Thermoplastic resins
    • F16C2208/30Fluoropolymers
    • F16C2208/32Polytetrafluorethylene [PTFE]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20Thermoplastic resins
    • F16C2208/36Polyarylene ether ketones [PAEK], e.g. PEK, PEEK
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40Linear dimensions, e.g. length, radius, thickness, gap
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/60Thickness, e.g. thickness of coatings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/70Diameters; Radii

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sliding-Contact Bearings (AREA)
  • Laminated Bodies (AREA)
  • Support Of The Bearing (AREA)
  • Lift Valve (AREA)

Abstract

一种用在旋转阀轴上的套筒轴承,所述旋转阀轴常常在足以挤压出PTFE的工作压力下工作,所述套筒轴承包括一最好由PEEK材料制成的圆筒形非金属轴套。所述轴套具有一圆筒形内腔,所述内腔形成在相对设置的环形内腔端凸缘之间,圆筒形PTFE轴衬设置在所述内腔内。位于圆筒形非金属轴套内表面上的环形内腔端凸缘向内延伸至一端凸缘表面,所述端凸缘表面的直径稍稍大于控制阀回转轴的直径。使用一种适当的粘结剂将轴衬粘结于所述轴套上。即使粘结剂失效,内腔端凸缘仍能将轴衬维持在它的位置上。端凸缘结构和诸端凸缘与回转轴之间的极小的间隙能使PTFE轴衬所承受的载荷大于在开始挤压PTFE之前的其他PTFE轴承结构。在所述PTFE轴衬开始挤压PTFE之后,小的间隙能保证将任何过载的PTFE仍保持在非金属轴套的内腔内。

Description

内部具有聚四氟乙烯轴衬的聚醚醚酮轴承
本发明涉及用于回转轴的轴承,特别涉及一种用于流体控制阀的回转轴的套筒式轴承。
本发明的背景
人们已经提出了采用聚四氟乙烯(“PTFE”)来作为一种在具有金属轴套或其它金属支承层的套筒轴承中使用的轴承材料。例如,在题为“碳氟塑料套筒轴承”的美国专利No.3,033,623中揭示了一种具有金属壳体的PTFE轴承,所述PTFE轴承包括一具有一孔腔的壳体或主体,在所述孔腔内设置有一在其轴承面上厚度大体均匀的、可方便地拆卸下来的套筒。具有层压结构的这种套筒设有一具有低摩擦系数的耐磨合成塑料表面,诸如PTFE表面。所述耐磨合成塑料形成一薄层并牢固地固定于一径向具有足够柔性的圆周刚性的金属支承层或支承片上,因此,所述轴承孔腔直径和圆度由壳体孔腔的直径和形状来决定。具有低摩擦系数的耐磨合成塑料的金属背衬的厚度是:当形成一圆筒体并设置在壳体的孔腔内时,所述背衬的圆周呈刚性,因此,能保持在工作过程中所述层压轴衬上没有任何一部分会朝着圆周方向起皱或隆起,或者当被封闭在回转轴和壳体之间时没有别的变形。所述金属背衬具有足够的柔性,它与所述孔腔的表面和所述壳体的形状精确一致,因此保证了耐磨合成摩擦表面的良好的散热性,并还能获得准确的壳体孔腔尺寸。
但是,在这些传统的PTFE轴承中,当这些轴承受到与流体控制阀的回转轴套筒轴承所通常承受的大的工作负荷压力时,所述PTFE轴承表面在其冷变形点(系统温度为450°F或232℃时,近似500psi或3448Kpa)发生屈服,并从金属轴套和阀轴之间被挤压出来,从而引起轴承失效。
此外,在这种已有技术的PTFE轴承结构中,有这样一种较大的可能,即,在流体控制阀的通常工作中,所述PTFE轴承的金属背衬或壳体构件将与流体控制阀的回转轴发生接触从而引起回转轴的划伤、擦伤或其它损伤。其结果是降低阀的性能或使阀失效。
在已有技术中还有一种完全用聚醚醚酮(“PEEK”)制造的用于流体控制阀回转轴的套筒式轴承。虽然,这种轴承回避了当轴承受到高工作负荷压力时回转轴损伤的问题,但是,这种轴承的摩擦系数较高,并且耐磨性较低。
因此,人们希望具有一种用于流体控制阀回转轴的轴承,这种轴承使用方便并能降低摩擦、降低成本、具有良好的化学惰性,并能提高轴承的负荷能力,延长其使用寿命。
本发明的概述
本发明提供了一种用于具有一回转轴的流体控制阀的轴承,所述回转轴工作在足以使PTFE过载并挤压出PTFE的工作负荷压力之下。所述轴承包括一圆筒形非金属轴套,所述轴套具有一圆筒形内腔,该内腔形成在彼此相对设置的环形内腔端凸缘之间,在所述内腔内设置由一圆筒形轴衬。所述圆筒形非金属轴套最好由PEEK制成。
所述轴衬由一种具有低摩擦系数的耐磨合成塑料PTFE制成。所述PTFE轴衬还适于并制成一定大小以围绕一流体控制阀的回转轴,从而使所述回转轴能在足以使PTFE过载而挤压出PTFE的工作压力下相对于轴衬转动。此外,所述轴衬在其整个长度上厚度均匀,因此当套入并由此保持在非金属轴套的圆筒形内腔内两相对设置的内腔端凸缘之间时,轴衬的直径与内腔端凸缘内表面的直径相一致,从而将任何过载的PTFE保持在所述内腔内。所述PTFE轴衬的内径大体与端凸缘的直径相等。
用一种适当的粘结剂将所述轴衬粘结于所述轴套上。如果所述粘结剂失效,所述内腔端凸缘仍能将轴衬保持在位。
虽然所述非金属轴套最好是由PEEK制成,但是,也可以采用其它非金属材料。
附图简要说明
在各附图中,凡是相同的标号均表示相同的构件和部件,其中:
图1是一其内具有PTFE轴衬的圆筒形非金属轴承的纵向剖视图,所述轴衬设置在本发明的一流体控制阀的回转轴的周围;
图2是移去了PTFE轴衬的图1所示圆筒形轴套的纵向剖视图。
本发明的具体描述
现请参阅各附图。图中示出了本发明的轴承10的一实施例,所述轴承包括一非金属轴套11和一围绕一流体控制阀回转轴14的圆筒形PTFE轴衬12。
所述轴套11呈圆筒形形状,并包括一内表面16和一外表面18。所述轴套11的内表面16包括一圆筒形内腔20,所述圆筒形内腔形成在两相对设置的环形腔凸缘22和24和所述流体控制阀转轴14之间。在所述较佳实施例中,所述轴套11完全是由PEEK材料制成的。
所述环形腔凸缘22和24设置在轴套11的内表面16的上、下端处。环形腔凸缘22和24从轴套11的内表面16向内延伸至端凸缘表面26和28。端凸缘表面26和28紧靠着流体控制阀回转轴14。因此,每一端凸缘表面26和28的内径只稍稍大于回转轴14的直径。在本较佳实施例中,存在于每一端凸缘表面26及28的直径和回转轴14直径之间的间隙或差值等于或小于0.0075英寸(0.019厘米),由此提供了一零间隙的条件。
轴套11的外表面18大体呈圆筒形。但是,在外表面18的上端30,有一凸出部分32从所述外表面上延伸出来。
所述圆筒形PTFE轴衬12具有一定大小以能安装入圆筒形内腔20内,所述圆筒形内腔形成在相对设置的环形腔凸缘22和24和流体控制阀回转轴14之间。圆筒形PTFE轴衬12适于围绕流体控制阀回转轴14设置,从而在工作负荷压力足以挤压出PTFE的条件下,在使用具有圆筒形PTFE轴衬12的流体控制阀的过程中,能使所述回转轴相对于所述轴衬转动。一适当的粘结剂被用来将所述轴衬12粘结于所述轴套11上。
圆筒形PTFE轴衬12具有一厚度,该厚度足以将轴衬12套入形成在内腔端凸缘22和24之间的内腔20内,并且所述轴衬12的内径与端凸缘表面26和28的直径相一致,当所述旋转控制阀轴14处于通常足以挤压出PTFE的工作压力的情况下,仍能将所述过载的PTFE保持在由内腔20、所述轴套11的内腔端凸缘22和24以及流体控制阀的回转轴14所形成的区域的内部。当处于所述范围内时,测得PTFE的载荷极限超过了其正常挤压冷变形点。
在工作过程中,流体控制阀回转轴14与圆筒形PTFE轴衬12以及内腔端凸缘22和24的端凸缘表面26和28在轴承内圆周的近似90度的表面上接触。在正常工作中,内腔端凸缘22和24的端凸缘表面26和28的非金属或PEEK材料成分防止了所述回转轴14被划伤。此外,当PTFE轴衬12被置于内腔端凸缘22和24和回转轴24之间时,所述PTFE轴衬12所能承受的载荷将大于开始挤压出PTFE轴衬之前的其他PTFE轴承结构。在PTFE轴衬12处于过载状态之后,内腔端凸缘22和24的端凸缘表面26和28和回转轴14之间为0.0075英寸(.0019厘米)的最大间隙足以保证使过载的PTFE保持在内腔20内,其中所述最大间隙位于所述回转轴14和圆筒形PTFE轴衬12之间高载侧的正对面的一点处。
例如,本发明的轴承可以用于那些额定工作在500°F或260℃的温度下、600+psi或4137+Kpa系统中的旋转流体控制阀内。在这样的条件下,所述轴承将能在450°F或232℃的温度下承受500+psi或34475+Kpa的压力,而不会将PTFE挤压出内腔20。
对于这样一种应用,对于一直径为0.7500英寸(1.91厘米)的旋转流体控制阀轴来说,所述PEEK轴套11可以是1.25英寸(3.18厘米)长,外径在0.904英寸和0.908英寸(2.30厘米和2.31厘米)之间。轴套11的内表面16的内腔20可以是1.12英寸(2.84厘米)长,内径在0.785和0.789英寸(1.99厘米和2.02厘米)之间。端凸缘表面26和28的直径可以在0.752英寸和0.756英寸(1.91厘米和1.92厘米)之间的范围内。
这种用途的圆筒形PTFE轴衬12可以安装在长为1.12英寸(2.84厘米)、厚度在0.0145英寸和0.0175英寸(0.0368厘米和0.0445厘米)之间、内径在0.752英寸和0.756英寸(1.91厘米和1.92厘米)之间的内腔中、内径端凸缘表面26和28的内径相一致。
以上的具体描述仅仅是为了便于理解,而不应该把本发明理解为局限于以上具体描述的范围内,因为对于那些本技术领域的的熟练人员来说,作出种种改变和变化将是显而易见的。

Claims (5)

1.一种用在流体控制阀上的轴承,所述流体控制阀具有一回转轴,常常在工作负荷压力足以使PTFE过载而挤出PTFE的情况下工作,所述轴承包括:
一圆筒形PTFE轴衬,所述轴衬适于围绕所述回转轴以便在所述具有圆筒形PTFE轴衬的流体控制阀的使用过程中,使所述回转轴能相对于轴衬转动,并能承受可足以挤压出PTFE的工作负荷压力;
一圆筒形非金属轴套,该轴套具有一内表面并包括一圆筒形内腔,所述内腔形成在彼此相对设置的环形内腔端凸缘之间、用来保持所述轴衬,所述内腔端凸缘从所述内表面起向内延伸至一端凸缘表面,所述端凸缘表面的直径稍稍大于所述回转轴的直径;以及
所述圆筒形PTFE轴衬的厚度足以将所述轴衬套入所述内腔内于所述内腔端凸缘之间,并且所述轴衬的内径与所述端凸缘的内径相一致,当所述旋转控制阀在足以挤压出PTFE的大的工作压力下工作时,任何过载的PTFE保持在所述内腔内和所述轴套的内腔端凸缘之间。
2.如权利要求1所述的轴承,其特征在于,所述圆筒形轴套由一种碳氟化合物材料制成。
3.如权利要求1所述的轴承,其特征在于,所述圆筒形轴套由PEEK材料制成。
4.如权利要求1所述的轴承,其特征在于,所述端凸缘表面和回转轴之间的间隙小于或等于0.0075英寸。
5.如权利要求1所述的轴承,其特征在于,所述端凸缘表面和回转轴之间的间隙基本上是零间隙。
CN95193935A 1994-06-21 1995-06-19 内部具有聚四氟乙烯轴衬的聚醚醚酮轴承 Expired - Lifetime CN1054188C (zh)

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US08/262,940 US5568983A (en) 1994-06-21 1994-06-21 Peek bearing with trapped PTFE bearing liner
US08/262,940 1994-06-21

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BR9508106A (pt) 1997-08-12
US5568983A (en) 1996-10-29
NO965529L (no) 1997-02-20
EP0766793A1 (en) 1997-04-09
MX9606593A (es) 1997-05-31
JPH10501875A (ja) 1998-02-17
AU683571B2 (en) 1997-11-13
CA2193672A1 (en) 1995-12-28
WO1995035451A1 (en) 1995-12-28
DE69509770D1 (de) 1999-06-24
CN1153547A (zh) 1997-07-02
FI115995B (fi) 2005-08-31
AU2866595A (en) 1996-01-15
CA2193672C (en) 2003-09-23
DE69509770T2 (de) 1999-12-02
EP0766793B1 (en) 1999-05-19
KR100363865B1 (ko) 2003-03-26
JP3630330B2 (ja) 2005-03-16
ATE180317T1 (de) 1999-06-15
FI965175A (fi) 1997-02-20
FI965175A0 (fi) 1996-12-20
NO965529D0 (no) 1996-12-20

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