【摘要】：RTV是一種防止污閃涂料,被普遍應(yīng)用于電力系統(tǒng)各高壓變電站電氣設(shè)備絕緣子上防止污閃。目前,對絕緣子噴涂RTV主要通過工人手工噴(刷)涂方式實現(xiàn),易造成浪費(fèi)涂料、污染環(huán)境、涂層質(zhì)量無法保證,以及人身安全隱患等問題,因此,有必要探索和研制一種絕緣子RTV涂料自動噴涂清洗系統(tǒng),實現(xiàn)對絕緣子進(jìn)行RTV涂料的自動噴涂及噴涂前的清洗。首先,對噴嘴外流場進(jìn)行仿真分析,研究噴涂參數(shù)對噴涂質(zhì)量的影響。由于RTV涂料屬于油漆類型,其變形速率與切應(yīng)力不符合線性關(guān)系,因此本文仿真的流體設(shè)為非牛頓流體�；谙嚓P(guān)流體力學(xué)的基本理論,利用流體力學(xué)仿真軟件Fluent對不可壓縮的非定常流動流體進(jìn)行了氣液兩相流噴嘴外流場的仿真研究。選擇Fluent軟件中近壁面模型法對壁面進(jìn)行處理,研究了噴槍工作運(yùn)行參數(shù)(如工作壓力、RTV液體流量)對噴涂外流場的影響,并對噴涂過程進(jìn)行了物理實驗測試,通過以上研究分析和實驗對比,發(fā)現(xiàn)仿真效果和實際試驗效果基本相符,為設(shè)置RTV涂料自動噴涂系統(tǒng)參數(shù)以及如何進(jìn)一步提高噴涂質(zhì)量等奠定了理論基礎(chǔ)。然后,基于RTV涂料(半)自動噴涂的功能需要,結(jié)合絕緣子的傘裙結(jié)構(gòu)特點(diǎn),完成了新噴涂裝置的原理方案設(shè)計、詳細(xì)結(jié)構(gòu)設(shè)計、控制系統(tǒng)設(shè)計、非標(biāo)零部件加工制造、控制電路設(shè)計與制備等。(1)本裝置采用開口轉(zhuǎn)盤結(jié)構(gòu),絕緣子可以通過轉(zhuǎn)盤缺口直接進(jìn)入裝置中心,不需要拆卸絕緣子,可以實現(xiàn)對電站已安裝好的絕緣子傘裙進(jìn)行噴涂及清洗。(2)為了適應(yīng)變電站絕緣子傘裙的形狀和大小的變化,在噴涂裝置上添加了相應(yīng)的調(diào)節(jié)裝置,用于調(diào)節(jié)噴涂水平距離和垂直高度,實現(xiàn)對一定尺寸范圍內(nèi)任意直徑的絕緣子傘裙的可噴涂性。(3)為了保障系統(tǒng)的持續(xù)可用、防止噴槍堵塞、噴涂前對絕緣子表面的凈化處理等,通過切換RTV涂料噴涂管路和清洗(如水或?qū)Ｓ们逑磩?管路,可以實現(xiàn)清洗和噴涂的功能集成。(4)整個系統(tǒng)通過研制的控制電路進(jìn)行(半)自動控制,保障噴涂過程的自動化以及噴涂質(zhì)量穩(wěn)定性等。最后,對全套系統(tǒng)進(jìn)行總裝、聯(lián)調(diào)和樣機(jī)試驗�；趪娮焱饬鲌龇抡娣治鼋Y(jié)果,編寫設(shè)置了相關(guān)噴涂清洗工藝及參數(shù),對整套系統(tǒng)總裝后進(jìn)行了聯(lián)調(diào),在聯(lián)調(diào)通過后進(jìn)行了樣機(jī)的實際噴涂試驗。與人工手動噴涂效果對比后,發(fā)現(xiàn)本套樣機(jī)噴涂的涂層具有均勻性良好、表面光澤、無(少)積瘤等優(yōu)點(diǎn),并且室溫硫化后絕緣子上表面的涂層厚度均達(dá)到電力行業(yè)標(biāo)準(zhǔn)規(guī)定的0.4-0.6mm范圍要求。
[Abstract]:RTV is a kind of anti-pollution flashover coating, which is widely used to prevent pollution flashover on insulators of electrical equipment in various high voltage substations of power system. At present, RTV spray on insulator is mainly realized by manual spraying (brush), which can easily lead to waste paint, pollute the environment, the quality of coating can not be guaranteed, and the hidden danger of personal safety and so on. It is necessary to explore and develop an automatic cleaning system for insulator RTV coating, which can realize the automatic spraying of insulator with RTV coating and the cleaning before spraying. Firstly, the effect of spray parameters on spray quality is studied by simulation and analysis of nozzle flow field. Because RTV coating belongs to paint type, its deformation rate and shear stress do not accord with the linear relationship, so the fluid simulated in this paper is set as non-Newtonian fluid. Based on the basic theory of correlated fluid mechanics, the flow field of an incompressible unsteady flow nozzle was simulated by using the fluid dynamics simulation software Fluent. The near wall model method in Fluent software is selected to deal with the wall surface. The influence of the operating parameters (such as working pressure, RTV liquid flow) on the spray flow field is studied, and the spray process is tested by physical experiments. Through the above research and comparison, it is found that the simulation effect is basically consistent with the actual experimental effect, which lays a theoretical foundation for setting the parameters of RTV coating automatic spraying system and how to further improve the spraying quality. Then, based on the functional requirement of RTV coating (semi-automatic spraying), combined with the structural characteristics of the insulator's umbrella skirt, the principle scheme design, detailed structure design, control system design, non-standard parts processing and manufacture of the new spraying device are completed. Control circuit design and fabrication etc. (1) the device adopts an open disc structure, the insulator can enter the center of the device directly through the gap of the rotary disc, and the insulator does not need to be removed. It is possible to spray and clean the insulator umbrella skirt installed in power station. (2) in order to adapt to the change of the shape and size of the insulator umbrella skirt in substation, a corresponding adjusting device is added to the spraying device. It is used to adjust the horizontal distance and vertical height of spraying, to realize the sprayability of the insulator umbrella skirt with any diameter in a certain size range. (3) in order to ensure the continuous use of the system and prevent the spray gun from clogging, Cleaning the insulator surface before spraying, by switching the RTV coating spraying pipe and cleaning (such as water or special cleaning agent) pipeline, It can realize the function integration of cleaning and spraying. (4) the whole system can be controlled (semi-automatically) by the developed control circuit to ensure the automation of spraying process and the stability of spraying quality. Finally, the complete system assembly, union and prototype test. Based on the simulation and analysis results of nozzle flow field, the related spray cleaning process and parameters were programmed and adjusted after the assembly of the whole system. The actual spraying test of the prototype was carried out after the joint adjustment. Compared with manual spraying, it is found that the coating has the advantages of good uniformity, glossy surface, no (less) nodule and so on. The coating thickness of the insulator surface after room temperature vulcanization is up to the 0.4-0.6mm range stipulated by the power industry standard.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ639;TM63

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