CN101535122B - 一种飞行器的结构件 - Google Patents

一种飞行器的结构件 Download PDF

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CN101535122B
CN101535122B CN2007800288426A CN200780028842A CN101535122B CN 101535122 B CN101535122 B CN 101535122B CN 2007800288426 A CN2007800288426 A CN 2007800288426A CN 200780028842 A CN200780028842 A CN 200780028842A CN 101535122 B CN101535122 B CN 101535122B
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阿兰·波特
布律诺·梅达
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Abstract

本发明涉及一种飞行器发动机机舱的进气道的后支架,其中,该后支架的一部分由纤维增强的矿物聚合物树脂基复合材料制成,包括至少一个围绕在预置的供防冰系统通过的孔洞周边的,由纤维增强的矿物聚合物树脂基复合材料制成的部分(56),以及至少另外一个金属部分(58)。

Description

一种飞行器的结构件
技术领域
本发明涉及飞行器上一种有可能承受高温的结构件,尤其是飞行器发动机机舱的后支架。 
背景技术
飞行器包括一些结构件,它们的功能主要用来确保在上述结构件上的各个部位之间获得力或进行力的传递。这些结构件主要包括能够与空气接触并使结构件具有一定刚度的飞行器的外部支撑。 
图1示出在飞行器进气道10上设置的一个结构件,进气道安置在发动机机舱的前部,发动机机舱内置有马达装置。该结构件被称作后支架12,它把发动机机舱的内表面14和发动机机舱的外表面16连接起来。这个后支架10负责承担着作用在进气道上的各种力,诸如弯曲应力、旋转力或其它的力,如进气道的重量、或由扰流等产生的各种力。 
鉴于燃油在飞行器的使用费用中占有很大的比重,制造商试图用降低飞行器重量的方式,尤其是采用复合材料来制造飞行器某些结构件的方法来降低消耗成本。 
这些复合材料主要是由纤维构成,例如可以是被浸泡在有机树脂的矿物基质材料(比如是热塑性或热固性的环氧树脂)中的碳纤维,石墨,玄武岩,芳纶或玻璃等。根据不同的情况,纤维可以是编织物或未编织的纤维毡的形式。 
这些纤维一般都要做涂层以备事后应用。事实上,在加工初期,这些纤维的表面状态会受到破坏,这样就会影响到有机树脂的附着性。此外,对于原始状态的纤维进行操作是个棘手的问题,例如在进行编织工序的过程中,纤维丝会从主纤维束中自己滑脱出来。同样,干纤维也要进行处理,以便改善它们的表面状态,然后在表面涂上一层有机树脂,从而在事后的浸润中增加它们的化学附着性。这种涂覆的工序被称作挂胶。挂胶后出售的纤维是光滑的,并且可以随时待用。 
对纤维和环氧树脂挂胶的工业技术已经得到发展。这些技术已经被掌握,并且这些部件的制造费用相当于生产其他同等金属部件的制造费用。 
另外,复合材料部件的机械特性至少与金属部件的机械特性相等,并且重量明显轻于后者。 
然而,在某些情况下,利用复合材料制造结构部件可能会带来问题,尤其是在这种部件位于可能承受高温区域的部位时,比如高于500℃区域中。这里主要指的是进气道的后支架。在这样的高温下,以有机树脂为基体的复合材料制造的部件失去了它们的结构特性和机械特性,结构件不能接受出现这样的情况。 
一种解决方案是不使用复合材料而使用钛金属来制造这些构件。即便构件在高温环境中,也能保持它们的机械特性和结构特性,但这种方案不能降低飞行器的重量,反而还导致了制造和使用费用的上升。 
另一种方案是使用现有技术生产复合材料构件,并把有可能承受高温的表面覆盖上一层绝热材料(也被称作防火屏蔽层)。根据图2所示的实施例,后支架12由复合材料制成,并且覆盖了一层防火屏蔽层20,用来保护可能处于高温环境下的复合材料表面。 
根据第一种选择,防火屏蔽层可以由玻璃纤维纱或岩石纤维纱添加在两个维护金属箔片之间所构成。根据另一种选择,防火屏蔽层可以由一层硅酮所构成。 
对于后支架而言,该支架还包括一个安装导板22,用于固定从进气道的唇缘26引出的防冰系统的管路24,该管路中通过的是来自于发动机的高温空气。为了保护复合材料制成的后支架,必须在该支架和安装导板之间预置一个隔热件28。 
由此看来,依照现有技术来使用复合材料的效果并不令人满意,因为添加隔热材料的做法,例如添加防火屏蔽层,会使得制作结构件的工序复杂化,因而采用复合材料所带来的重量减轻的好处完全被使用防火屏蔽层的处理方案抵消了。 
发明内容
因此,本发明是要克服现有技术方案中的不足,提供一种较轻的飞行器发动机机舱的进气道的后支架,它能够在高温情况下,仍可保持它的机械特性和结构特性。 
为此目的,本发明涉及一种飞行器发动机机舱的进气道的后支架,其特点在于:它的一部分是由纤维增强的矿物聚合物树脂基复合材料制成,至少围绕在预置的供防冰系统通过的孔洞周边的部分是由纤维增强的矿物聚合物树脂基复合材料制成的,并且至少还有另外一个金属部分。 
附图说明
本发明说明书中提及的其他特性和优点可对照参阅附图,说明书仅为例证,其中: 
-图1为飞行器发动机机舱的进气道的纵向剖面图,它包括一个依照现有技术被称作后支架的结构件, 
-图2是依照现有技术制作的后支架的局部剖面图, 
-图3是飞行器发动机机舱的进气道的纵向剖面图,它包括一个依照本发明被称作后支架的结构件, 
-图4是依照本发明的第一个变例制成的后支架的局部剖面图,以及 
-图5是依照本发明的另一个变例制成的后支架的局部剖面图。 
具体实施方式
在图3中,数字30表示飞行器发动机机舱的一个进气道。这个进气道有一个内表面32和一个外表面34,该内表面能与发动机机舱内部流动的动力气流相接触,该外表面能与发动机机舱外部流动的动力气流相接触。 
内表面32可有一块隔音护板或隔音表面36.内表面和外表面不再详述,因为业内人士均了如指掌。 
进气道30包括一个被称作后支架38的结构件,它把内表面32和外表面34连接起来并承担着作用在结构件上的各种力,如作用在进气道上的弯曲应力、旋转力或其它的力,诸如进气道的重量,和扰流作用产生的各种力。 
这个后支架38可包括一个开口,以提供用于固定管路44的安装导板40,该管路是为进气道30的唇缘46的防冰系统预设的,它使用的是来自于发动机的高温空气。 
根据本发明,后支架38至少有一部分是由纤维增强的矿物聚合物树脂基复合材料制成的。 
为了能够得到可以保持耐高温机械性能的材料,人们采用了氧化硅和氧化铝类的(xSiO2,AlO2)矿物聚合物树脂,其中的x在1.75和50之间,或等于1.75或50。使用由Cordi-géopolymère公司生产的名称为MEYEB的商业树脂是有利的。 
所谈到的矿物聚合物树脂,是指一种矿物聚合物树脂或者是多种矿物聚合物树脂的混合物。 
从应用角度来讲,纤维可以有不同的截面,并且可以用各种不同的材料制成,例如,用碳、石墨、玄武岩、芳纶或玻璃。 
纤维可以是编织物、非编织物或者为纤维毡的形式。 
这些纤维一般都会事先进行涂层以备日后使用。在实际生产中,尤其是在加工初期,这些纤维的表面状态会受到破坏,这样会影响到有机树脂的附着性。此外,对原始状态的纤维进行加工操作也是棘手的,例如在编织工序中,纤维丝会从主纤维束中滑脱出来。干纤维同样也要进行处理,以便改善它们的表面状态,然后涂上一层有机树脂,从而在随后的浸润中增加它们的化学附着性。这种涂覆的工序被称作挂胶。挂胶后出售的纤维是光滑的,并且可以随时待用。胶料的量和纤维本身相比,使用的量相对较少,大约只占挂胶后纤维质量的1%。另外,挂胶中使用的有机树脂的种类因各个制造商而有所不同。 
为了增加矿物聚合物树脂基体材料与纤维的附着力,必须要清洗胶料,至少要部分地进行清胶,因为有机树脂和矿物聚合物树脂是不亲和的。 
用热处理或化学处理的方式来进行清胶工作,可以应用在已经广泛商业化的纤维编织物上。 
在生产实践中使用的一种方式是,通过一种热处理方式来进行清胶,也就是将纤维加热直至达到树脂的热降解温度,使得树脂不再与纤维粘合。有利地,这种热处理是在惰性气体中进行的。 
这种处理是通过对挂胶的纤维所承受的温度和/或温度周期做出必要调整的方法,可以对绝大部分已经商业化的纤维进行这种处理。处理相对快速,几分钟即可。 
由于挂胶使用的树脂的热降解温度和碳纤维的氧化温度极为接近,将纤维所承受的温度和/或温度周期确定下来是恰当的。事实上,纤维的过度降解会严重损坏已有产品的性能。 
通常,清洗胶料过程的结束时间与纤维降解过程的开始时间相符。 
为了获得令人满意的纤维附着力和纤维有限的降解,一个较好的折衷办法是清除50%至90%之间的胶料。 
为了确定加热的温度,在一个样品上做过试验。由于采用了配合或不配合质谱法的热解质量分析(ATG),能够鉴别出胶料中使用的化合物,并能够确定清洗胶料的起始温度和结束温度以及减少的质量。 
热处理包括在惰性气体中加热产品,并要注意把炉火维持在由热解质量分析法确定下来的平均温度范围之内。质量损耗的最终检测可以验证整个过程的有效性。 
根据另一种操作方式,可以通过化学处理方式来实施清洗胶料,主要采用一种溶剂。 
首先必须要识别出胶料中使用的化合物,以便选择适合的溶剂。这种识别可以用热解质量分析法来确定。化学方法的操作相对简单,至少需要一次溶剂浴,比如用二氯甲烷溶剂。处理的时间主要根据 胶料中使用的化合物来确定。 
为了减少处理的时间,以获得令人满意的附着力和有限的处理时间,一个较好的折衷方法是清除50%至90%之间的胶料。 
根据本发明的另一个特性,为了使纤维能获得良好的浸润,按照体积比为3%至7%的比例在树脂中加入水,从而改善了树脂的流动性,并在纤维中获得了树脂移动的一致性。这种加水是对树脂制造商提倡的含水量的补充。 
后支架38至少有一部分是用矿物聚合物树脂基的复合材料制成,该材料耐高温并保持了它的机械性能和结构性能。这种解决方案能够获得实在的质量减轻的好处,因为它不需要任何防火屏蔽层来保护后支架38的表面免受高温的损害,也不需要在上述后支架和安装导板40之间插装隔热的结构件。 
后支架38是环形的,并借助于连接件48和连接件50从内表面32延伸到外表面34,连接件48连接在内表面上,连接件50连接在外表面上。为了使唇缘46的防冰系统通过,在这个环形件上预置了一个孔洞用来承接安装导板40。 
根据一种实施方式,连接件48是以至少一个弯曲边缘52的形式出现在后支架38上,它紧紧压抵内表面,并通过任何适当的手段与内表面固定在一起。 
根据一种实施方式,连接件50为T字型零件54,其头部通过任何适当的手段与外表面固定在一起,其底部通过任何适当的手段与后支架固定在一起。 
连接件48和50并不限定在这些实施方式中。还可以考虑其他的解决方案。 
后支架38的一部分是由纤维增强的矿物聚合物树脂基的复合材料制成的,至少围绕在预留的供防冰系统通过的孔洞周围部分由纤维增强的矿物聚合物树脂基的复合材料制成,并且至少另一部分是金属,以便在撞击情况下能够改变形状,吸收能量。如图5所示,后支架包括两个同心部分,第一个环形部分56由矿物聚合物树脂基复合材料制成,与外表面34接触;第二个环形金属部分58与内表 面32接触。两部分56和58通过任何适当的手段连接,尤其是通过在每个部分上预先设置的弯曲边缘60相互连接。如果发动机机舱具有一个大口径的进气道,并且因一个叶片断裂而产生大的冲击动力时,这种解决方案具有优势。后支架的金属部分58能够改变形状来吸收部分能量。 
当然,本发明并不局限于上述已经通过图解阐明的若干实施方式,它还包括从上述各种方案所派生出来的各种可能的变例。 

Claims (3)

1.一种飞行器发动机机舱的进气道的后支架,其特征在于:该后支架的一部分由纤维增强的矿物聚合物树脂基的复合材料制成,包括至少一个围绕在预置的供防冰系统通过的孔洞周边的,由纤维增强的矿物聚合物树脂基的复合材料制成的部分(56),以及至少另外一个金属部分(58),其中,两个部分是同心的,第一个环形的部分(56)与发动机机舱的外表面(34)接触,第二个环形的金属部分(58)与发动机机舱的内表面(32)接触。
2.根据权利要求1所述的飞行器发动机机舱的进气道的后支架,其特征在于:该后支架由浸泡过氧化硅或氧化铝类(xSiO2,AlO2)的矿物聚合物树脂的纤维复合材料制成,其中x在1.75和50之间,或等于1.75或50。
3.根据权利要求2所述的飞行器发动机机舱的进气道的后支架,其特征在于:纤维在进行矿物聚合物树脂浸润之前至少已经部分地清胶。
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