CN110662335B - Structure for balancing nonuniformity of electromagnetic field at end part of speed selector - Google Patents
Structure for balancing nonuniformity of electromagnetic field at end part of speed selector Download PDFInfo
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Abstract
本发明涉及一种用于平衡速度选择仪端部电磁场非均匀性的结构,其包括准直管头部、准直管、过渡杆、壳体上层、壳体下层、电磁屏蔽层、绝缘层;其中整体结构长宽尺寸均不超过40毫米,中心测量孔通道直径5毫米,设置多个安装通孔;过渡杆与壳体采用圆弧面配合,过渡杆与准直管采用螺纹连接,壳体与电磁屏蔽层和绝缘层之间采用螺钉压紧。该结构的连接简单可靠,同轴性好,能够减少速度选择仪的电磁场耦合误差,提高测量精度。
The invention relates to a structure for balancing the non-uniformity of the electromagnetic field at the end of a speed selector, which comprises a collimating tube head, a collimating tube, a transition rod, an upper shell layer, a lower shell layer, an electromagnetic shielding layer, and an insulating layer; The length and width of the overall structure are not more than 40 mm, the diameter of the central measuring hole channel is 5 mm, and there are multiple installation through holes; It is pressed with screws between the electromagnetic shielding layer and the insulating layer. The connection of the structure is simple and reliable, and the coaxiality is good, which can reduce the electromagnetic field coupling error of the speed selector and improve the measurement accuracy.
Description
技术领域technical field
本发明属于电推进等离子体测量领域,涉及一种用于平衡速度选择仪端部电磁场非均匀性的结构。The invention belongs to the field of electric propulsion plasma measurement, and relates to a structure for balancing the non-uniformity of the electromagnetic field at the end of a speed selector.
背景技术Background technique
电推进是一类利用电能对推进剂电离加速从而获得推力的推进方式,目前在航天器的轨道控制、深空探测和星际航行中都有很好的应用前景。而在电推力器中,有很多种推力器的等离子体羽流中的离子速度都可以通过速度选择仪(EXB探针的一种)进行诊断。Electric propulsion is a kind of propulsion method that uses electric energy to ionize and accelerate propellant to obtain thrust. At present, it has good application prospects in spacecraft orbit control, deep space exploration and interstellar navigation. In electric thrusters, however, there are many types of thrusters where the ion velocity in the plasma plume can be diagnosed by a velocity selector (a type of EXB probe).
速度选择仪诊断离子速度的关键部分电磁场区域在入口和出口处存在着电磁场衰减梯度不匹配,即耦合误差。这种耦合误差会导致离子在经过电磁场入口区域时发生偏转,对测量结果带来较大的系统误差。A key part of the velocity selector for diagnosing ion velocity is the electromagnetic field region where there is a mismatch in the electromagnetic field decay gradients at the inlet and outlet, that is, coupling errors. This coupling error causes the ions to be deflected as they pass through the entrance region of the electromagnetic field, resulting in large systematic errors in the measurement results.
发明内容SUMMARY OF THE INVENTION
本发明的主要目的在于设计一种平衡速度选择仪电磁场耦合误差的结构,通过一种机械结构的配合来满足中心孔通道的无轴式旋转。The main purpose of the present invention is to design a structure for balancing the coupling error of the electromagnetic field of the speed selector, and to satisfy the shaftless rotation of the central hole channel through the cooperation of a mechanical structure.
本发明的目的可以通过以下技术方案实现:一种用于平衡速度选择仪端部电磁场非均匀性的结构,包括准直管头部、准直管、过渡杆、壳体上层、壳体下层、电磁屏蔽层、绝缘层;其中整体结构长宽尺寸均不超过40毫米,中心测量孔通道直径5毫米,设置多个安装通孔;过渡杆与壳体采用圆弧面配合,过渡杆与准直管采用螺纹连接,壳体与电磁屏蔽层和绝缘层之间采用螺钉压紧。The object of the present invention can be achieved by the following technical solutions: a structure for balancing the non-uniformity of the electromagnetic field at the end of the speed selector, comprising a collimating tube head, a collimating tube, a transition rod, an upper shell layer, a lower shell layer, Electromagnetic shielding layer and insulating layer; the length and width of the overall structure are not more than 40 mm, the diameter of the central measuring hole channel is 5 mm, and multiple installation through holes are provided; the transition rod and the shell are matched with an arc surface, and the transition rod is aligned with The pipe is connected by screw thread, and the shell and the electromagnetic shielding layer and the insulating layer are pressed by screws.
进一步的,过渡杆与壳体之间通过圆弧面配合,可转动24度的角度范围,不会对离子准直性带来系统误差。Further, the transition rod and the housing are matched by the arc surface, and can be rotated in an angle range of 24 degrees, which will not bring systematic errors to the ion collimation.
进一步的,壳体上层和壳体下层之间的凹槽深度大于过渡杆的高度。Further, the depth of the groove between the upper layer of the shell and the lower layer of the shell is greater than the height of the transition rod.
进一步的,过渡杆与准直管采用可拆卸式的螺纹连接。Further, the transition rod and the collimating tube are connected by a detachable thread.
进一步的,采用无轴式旋转结构,解决了速度选择仪端部电磁场非均匀性的问题。Further, the shaftless rotating structure is adopted to solve the problem of the non-uniformity of the electromagnetic field at the end of the speed selector.
本发明的优点在于:The advantages of the present invention are:
1、该结构设计通过曲面配合的方式,实现中心通道无轴式旋转,解决了速度选择仪端部电磁场非均匀性的问题。1. The structure design realizes the shaftless rotation of the central channel by means of surface coordination, which solves the problem of the non-uniformity of the electromagnetic field at the end of the speed selector.
2、通过壳体上下扣合方式,可以保证通过机械连接控制位置精度和加工精度,简单可靠。2. Through the upper and lower fastening of the shell, the position accuracy and machining accuracy can be controlled by mechanical connection, which is simple and reliable.
3、通过过渡杆与壳体下层圆弧表面间隙配合的方式,保证过渡杆与壳体相对转动时仍然有较好的同轴度。3. Through the clearance fit between the transition rod and the arc surface of the lower layer of the shell, it is ensured that the transition rod and the shell still have good coaxiality when they rotate relative to each other.
4、壳体上层有弧形孔,与过渡杆上的螺纹孔配合满足过渡杆旋转后的位置可以通过螺栓及时固定。4. There are arc-shaped holes on the upper layer of the shell, which cooperate with the threaded holes on the transition rod so that the rotated position of the transition rod can be fixed in time by bolts.
附图说明Description of drawings
下面结合附图对本发明作进一步的说明。The present invention will be further described below in conjunction with the accompanying drawings.
图1(a)-1(c)为用于平衡速度选择仪端部电磁场非均匀性的结构的装配图和轴测图。Figures 1(a)-1(c) are assembly and axonometric views of a structure for balancing the non-uniformity of the electromagnetic field at the tip of the speed selector.
图2为离子运动轨迹仿真图。Figure 2 is a simulation diagram of the ion motion trajectory.
图中:1.壳体上层;2.过渡杆;3.壳体下层;4.电磁屏蔽层;5.绝缘层;6.准直管(一节);7.准直管头部。In the figure: 1. Upper layer of casing; 2. Transition rod; 3. Lower layer of casing; 4. Electromagnetic shielding layer; 5. Insulation layer; 6. Collimating tube (one section); 7. Collimating tube head.
具体实施方式Detailed ways
下面结合实施例对本发明的技术方案进行详细说明。The technical solutions of the present invention will be described in detail below with reference to the embodiments.
如图1(a)-1(c)所示,一种用于平衡速度选择仪端部电磁场非均匀性的结构,包括壳体上层1、过渡杆2、壳体下层3、电磁屏蔽层4、绝缘层5、准直管(一节)6、准直管头部7。如剖视图所示,准直管头部与准直管以及准直管之间、准直管与过渡杆之间均采用螺纹连接,连接简单可靠,同轴性好。As shown in Figures 1(a)-1(c), a structure for balancing the non-uniformity of the electromagnetic field at the end of the speed selector includes an
过渡杆与壳体之间要保持同轴转动,需要同时保证位置精度高、同轴性好和摩擦力小,考虑加工上的难度,将壳体分成上下两层壳体设计,上下层之间的凹槽深度大于过渡杆的高度,由此带来的好处有:1.分层设计加工难度大大降低;2.分层设计可采用先壳体下层后过渡杆最后壳体上层的方式安装,安装方便;3.上下层之间的凹槽深度大于过渡杆的高度可以保证过渡杆与壳体之间不承受螺钉的预紧力,减少整体结构转动时的摩擦力。壳体与过渡杆之间采用圆弧面配合以及圆弧槽与圆弧凸台配合,可转动24度的角度范围,在任意角度内,可以保证从入口入射的离子在不被偏转的情况下不会被所阻挡,对离子准直性不会带来系统误差。同时壳体上层有圆弧孔设计,与过渡杆上的螺纹孔配合可以在旋转结束时固定旋转位置。To maintain coaxial rotation between the transition rod and the shell, it is necessary to ensure high position accuracy, good coaxiality and low friction at the same time. Considering the difficulty of processing, the shell is divided into upper and lower shell design. The depth of the groove is greater than the height of the transition rod, which brings the following advantages: 1. The processing difficulty of the layered design is greatly reduced; Easy to install; 3. The depth of the groove between the upper and lower layers is greater than the height of the transition rod, which can ensure that the transition rod and the shell are not subjected to the pre-tightening force of the screw, and reduce the frictional force when the overall structure rotates. The shell and the transition rod are fitted with arc surfaces and arc grooves and arc bosses, which can be rotated within an angle range of 24 degrees. At any angle, it can ensure that the ions incident from the entrance are not deflected. It will not be blocked and will not introduce systematic errors to the ion collimation. At the same time, there is a circular arc hole design on the upper layer of the shell, which cooperates with the threaded hole on the transition rod to fix the rotation position at the end of the rotation.
本发明的结构设计的理论依据为离子在仪器中运动时,在端部会由于电磁场变化梯度不相等,使得离子受力不平衡发生偏转,其运动受力图如图2所示。前端为准直管区,中间为电磁场区,尾端为采集区。电磁场区中存在细长的均匀电磁场区域,而在端部电磁场衰减梯度不同,使得离子发生偏转,因此需要在准直管与电磁场区域之间添加一个旋转结构,保证离子在电磁场区域运动角度沿轴线方向。The theoretical basis of the structural design of the present invention is that when the ions move in the instrument, the ions will be deflected due to the unequal change gradient of the electromagnetic field at the end. The front end is the collimating tube area, the middle is the electromagnetic field area, and the tail end is the collection area. There is a slender and uniform electromagnetic field area in the electromagnetic field area, and the attenuation gradient of the electromagnetic field at the end is different, which makes the ions deflect. Therefore, a rotating structure needs to be added between the collimator and the electromagnetic field area to ensure that the ions move along the axis in the electromagnetic field area. direction.
上述仅为本发明较佳的具体实施方式,本发明的保护范围以权利要求书的保护范围为准。The above are only preferred specific embodiments of the present invention, and the protection scope of the present invention is subject to the protection scope of the claims.
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