CN104091987A - 一种兆瓦级波纹波导衰减器 - Google Patents
一种兆瓦级波纹波导衰减器 Download PDFInfo
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Abstract
本发明公开了一种兆瓦级波纹波导衰减器,在波导管上依次设有支持HE11模传输的标准波纹波导段一、实现HE11模向TE11和TM11混合模转变的光滑波导段二、实现TE11和TM11混合模向EH11模转化的模式变化波导段三、对功率进行衰减的主衰减波导段四、实现剩余功率中EH11模到TE11模转化的模式变化波导段五、用作TE11模传输的光滑波导段六、实现TE11模到HE11模转化的模式变化波导段七和支持HE11模传输的标准波纹波导段八。本发明周期性的槽纹的设计可以实现整个主衰减段内单位长度功率衰减量的均匀性,特殊的水路设计即可减少高流速冷却水对波导壁的冲击又可保证水在整个水套中流速的一致性。
Description
技术领域
本发明涉及微波工程技术领域,尤其涉及一种兆瓦级波纹波导衰减器。
背景技术
衰减器是微波系统中常用的一种二端口器件,主要用其来控制传输线内的传输功率。内部槽深约为四分之一工作波长的标准纹波导具有很高的功率容量和极低的传输损耗,已经成为高功率微波系统首选的传输器件。电子回旋共振加热系统作为高功率微波系统的一个典型代表被广泛应用于核聚变研究领域。在电子回旋加热系统的建设和运行过程中,需要对回旋管及高功率微波传输器件进行性能测试及功率定标,测试传输线终端剩余的微波功率需用水负载来吸收。目前电子回旋系统的单个回旋管输出功率已经达到兆瓦级别,且传输损耗很小,这就要求水负载必须具备兆瓦级功率的衰减能力。目前兆瓦级水负载普遍采用圆柱腔体的结构形式,微波能量从腔体顶部进入后,被安装在腔体底部的金属反射镜散射到腔体四周的内壁上,通过金属壁表面的涂覆材料及金属壁本身把波能量转化为热量,最后通过安装在壁后的冷却水路带走这些热量,从而实现对入射波能量的吸收。为了避免由各种入射模式在腔体共振引起的反射,水负载内腔直径通常要达到工作波长的百倍以上,腔体高度必须达到直径的几倍量级才能有足够的内腔表面积来吸收掉兆瓦级的功率。这就导致整个水负载腔体庞大且重达到百公斤以上,如此庞大的尺寸和重量给此类型水负载的安装调试带来诸多不便。如果设计一种波纹波导结构衰减器接在传输线末端,且此衰减器的衰减能力可以达到兆瓦量级,这样如果源功率在衰减器的衰减范围内,则终端将没有功率输出,从而不需要再连接腔体水负载。即使衰减器没有把源功率全部衰减掉,那么剩余的功率将下降到一个较低水平,这样终端只需要连接一个小型的腔体水负载就可以实现剩余功率吸收。波纹波导衰减器在外形上就相当于把原波导传输线延伸一截,且波纹波导的半径通常不超过工作波长的40倍,所以利用此波纹波导型衰减器将给系统调试运行带来便利。
发明内容
本发明目的就是为了弥补已有技术的缺陷,提供一种兆瓦级波纹波导衰减器。
本发明是通过以下技术方案实现的:
一种兆瓦级波纹波导衰减器,包括有圆形的波导管,在波导管上依次设有支持HE11模传输的标准波纹波导段一、实现HE11模向TE11和TM11混合模转变的光滑波导段二、实现TE11和TM11混合模向EH11模转化的模式变化波导段三、对功率进行衰减的主衰减波导段四、实现剩余功率中EH11模到TE11模转化的模式变化波导段五、用作TE11模传输的光滑波导段六、实现TE11模到HE11模转化的模式变化波导段七和支持HE11模传输的标准波纹波导段八,在波导管外壁上分布有周期性的槽纹,在整个波导管外围套装有圆形金属水套,在水套的前后端外壁上沿着圆周方向分别均匀开有12个圆孔,在水套的前后端圆孔外围分别套装半径大于水套半径的前、后金属圆柱腔体,在前、后金属圆柱腔体上分别开有冷却水进、出口。
兆瓦级波纹波导功率衰减器,按照功率的传输顺序依次包括以下部分,入口处的标准波纹波导中功率以HE11模式传输,此模式的功率在波导截面上呈准高斯分布特性,具有极低的传输损耗。而表面波模EH11与HE11相反,其功率几乎全部分布在波导内壁附近,从而导致EH11模的传输损耗非常大,所以把波纹管内的模式由HE11耦合成EH11即可实现微波功率的有效衰减。但HE11模不能直接耦合成EH11模,所以先要用一段内壁光滑波导来把HE11分解成TM11和TE11的混合模。光滑波导后接一个模式变化段,通过对这个模式变化段内部槽纹的设计可实现TE11和TM11混合模向EH11耦合。当EH11模形成后其所携带的微波功率开始显著衰减,所以EH11模形成后的波导段就承担着兆瓦级功率衰减任务,也是本发明设计的核心部件,要通过对主衰减段内轴线上槽纹深度值优化设计来实现单位长度衰减功率量的均匀性,从而避免在主衰减段内出现局部过热点,同时可以发挥主衰减段内单位长度最大功率吸收能力以减少整个衰减器的长度。如果入口处馈入的功率超出主衰减段的衰减能力,未被衰减掉的功率需要进一步向前传输,此时又需要重新把高损耗EH11模耦合成适合长距离传输的HE11模,同样由于EH11和HE11不能直接耦合,为此需要在主衰减段后面加一个模式变化段来实现EH11到TE11的转变。TE11形成后还要经过一个模式变化段来实现TE11到HE11的转变,同样这两个模式变段也是通过对波纹管内部槽纹的设计来实现的。通过这些功能段后既实现了微波功率的有效衰减,又使输入输出传输模式保持一致,所以此种类型衰减器可以连接在电子回旋系统传输线上任何位置,更重要的是通过若干个这样的衰减器级联可以实现若干兆瓦级功率的衰减吸收。
在整个衰减器波导壁外围套装圆形金属水套,高流速冷却水在水套和波导壁形成的夹层中流动。为了保证高流速冷却水在整个水套中流速的均匀性,在水套的前后端金属外壁上沿着圆周方向分别均匀开有十二个圆孔,在水套的前后端圆孔外围分别套装半径大于水套半径的前、后金属圆柱腔体,在前、后金属圆柱腔体上分别开有冷却水进、出口。冷却水由进口进入圆柱腔体,然后通过十二个圆孔引导进入水套中,这种开孔结构还可以减少高流速冷却水对波导外壁的直接冲击。波纹外壁上分布有周期性的槽纹,这可以增加金属壁与水的接触面积以增加换热效率,进一步增加衰减器单位长度的热负荷。
本发明的优点是:本发明采用圆波纹波导结构,其衰减功率可以达到兆瓦级别,前后端都可以直接和标准波纹波导相连接,周期性的槽纹的设计可以实现整个主衰减段内单位长度功率衰减量的均匀性,特殊的水路设计即可减少高流速冷却水对波导外壁的冲击又可保证水在整个水套中流速的一致性。
附图说明
图1为本发明专利总体结构剖面示意图。
图2为图1的A-A剖视图。
图3为本实施例内壁槽纹深度轴向分布曲线。
图4为本实施例轴向功率分布规律。
图5为本实施例内部槽纹在各波导段内的分布规律。
具体实施方式
如图1、2所示,一种兆瓦级波纹波导衰减器,包括有圆形的波导管9,在波导管9上依次设有支持HE11模传输的标准波纹波导段一1、实现HE11模向TE11和TM11混合模转变的光滑波导段二2、实现TE11和TM11混合模向EH11模转化的模式变化波导段三3、对功率进行衰减的主衰减波导段四4、实现剩余功率中EH11模到TE11模转化的模式变化波导段五5、用作TE11模传输的光滑波导段六6、实现TE11模到HE11模转化的模式变化波导段七7和支持HE11模传输的标准波纹波导段八8,在波导管9外壁上分布有周期性的槽纹14,在整个波导管13外围套装有圆形金属水套16形成圆环形水道15,在水套16的前后端外壁上沿圆周方向分别开有十二个圆孔13、20,在水套16的前后端的圆孔外分别套装一个半径大于水套半径的前、后金属圆柱腔体12、19,在前、后金属圆柱腔体12、19的外壁11和18上开有冷却水的进口10和出口17。
通过整个波纹波导的八个传输段后,实现了兆瓦级微波功率的衰减,同时剩余功率以低损耗模HE11的形式从末端输出。衰减的微波功率将转化为波导金属壁的热量,高流速冷却水从冷却水的进口10进入并到达前金属圆柱腔体12,然后从圆孔13流进圆环形水道15,在圆环形水道15末端通过圆孔20流进后金属腔体19,最后从冷却水出口17流出,从而把波导管9和槽纹14上产生的热量带走。设入射波工作频率为140GHz,1到8段波纹波导直径都为31.75mm,波导壁材料为纯铜且槽纹宽度和周期分别为:0.45mm和0.65mm。1段处入射功率为1.1MW,当波纹波导内壁的槽纹深度沿轴向分布满足如图3所示的曲线时就可以现实1MW功率的衰减,相应的轴向功率分布规律如图4所示。从图4可见,在衰减器的出口段8处剩余功率为0.1MW,即2.32米长的波纹波导衰减器实现了1MW微波功率的衰减吸收。图5为吸收1MW功率的衰减器内部1至8段内部槽纹分布特性。
Claims (1)
1.一种兆瓦级波纹波导衰减器,其特征在于:包括有圆形的波导管,在波导管上依次设有支持HE11模传输的标准波纹波导段一、实现HE11模向TE11和TM11混合模转变的光滑波导段二、实现TE11和TM11混合模向EH11模转化的模式变化波导段三、对功率进行衰减的主衰减波导段四、实现剩余功率中EH11模到TE11模转化的模式变化波导段五、用作TE11模传输的光滑波导段六、实现TE11模到HE11模转化的模式变化波导段七和支持HE11模传输的标准波纹波导段八,在波导管外壁上分布有周期性的槽纹,在整个波导管外围套装有圆形金属水套,在水套的前后端外壁上沿着圆周方向分别均匀开有12个圆孔,在水套的前后端圆孔外围分别套装半径大于水套半径的前、后金属圆柱腔体,在前、后金属圆柱腔体上分别开有冷却水进、出口。
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