本文選題：流量 + 閥口��； 參考：《中國海洋大學(xué)》2015年碩士論文

【摘要】：水液壓技術(shù)以其綠色環(huán)保、安全、高效、成本低廉等優(yōu)點,在工程機械、海洋開發(fā)、新能源利用等諸多領(lǐng)域具有非常廣闊的應(yīng)用前景。水壓控制閥是水液壓傳動技術(shù)相當(dāng)重要的組成部分,水液壓傳動技術(shù)的大范圍推廣應(yīng)用必須以研制出高性能水液壓控制閥為前提。而水壓閥口的特性作為水壓控制閥研究的核心,必須放在首要位置。本文對提升型閥口的常見類型進行了較為系統(tǒng)的仿真研究,并根據(jù)仿真結(jié)果分析了閥口的各項特性,為水液壓閥口的選型、設(shè)計提供了一定的參考依據(jù)。主要工作如下：一級節(jié)流錐閥閥口的水力學(xué)特性仿真,包括閥芯錐角及閥座倒角長度對閥口水力學(xué)特性的影響。經(jīng)分析發(fā)現(xiàn),閥芯錐角a增大會阻礙流體在閥口內(nèi)的流動,使流體作用在閥芯上的力增大,相反,閥芯錐角增大有利于減小閥口內(nèi)部的氣穴現(xiàn)象；而對于帶倒角的一級節(jié)流錐閥,同等條件下,閥座倒角長度的增加對流經(jīng)閥口的流量及作用在閥芯上的液動力無明顯影響,但有利于減小閥口內(nèi)部的氣穴現(xiàn)象。球閥及平板閥的水力學(xué)特性仿真,分析不同閥芯結(jié)構(gòu)對閥口水力學(xué)特性的影響。錐閥與球閥比較,在閥口內(nèi)部都發(fā)生氣穴的情況下,錐閥的流量更穩(wěn)定,同時錐閥的抗氣蝕性能明顯強于球閥,但是錐閥閥芯受到的液動力稍微高于球閥閥芯受到的液動力,綜合考慮以上三種特性,錐閥性能比球閥好：進一步將錐閥與平板進行比較,在閥口內(nèi)部都發(fā)生氣穴的情況下,通過錐閥的流量小于通過平板閥的流量,同時當(dāng)入口壓力大于6MPa時,錐閥閥芯受到的液動力小于平板閥閥芯受到的液動力,并且錐閥的抗氣蝕性能比平板閥好,綜合考慮以上三種特性,錐閥性能比平板閥好。二級節(jié)流錐閥閥口水力學(xué)特性仿真,包括閥芯錐角及帶緩沖槽的閥口緩沖角對閥口水力學(xué)特性的影響。經(jīng)分析發(fā)現(xiàn),同等條件下,閥芯錐角a增大會阻礙流體在閥口內(nèi)的流動,當(dāng)a較小時,這種阻礙作用可忽略,相反,閥芯錐角a增大會使閥芯受到的液動力減小,同時增大閥芯錐角有利于減小閥口內(nèi)部的氣穴現(xiàn)象;對帶有緩沖槽的二級節(jié)流閥口,同等條件下,緩沖角a的增大對閥芯受到的液動力無明顯影響,無緩沖槽閥口閥芯受到的液動力要比有緩沖槽的閥口閥芯受到的液動力稍大一些,對閥口的抗氣蝕性能,同等條件下,緩沖角小的閥口,抗氣蝕特性好,不帶緩沖槽的二級節(jié)流閥口,閥口的抗氣蝕性能介于a=]0。與a=15。之間。一級節(jié)流與二級節(jié)流比較,同等條件下,通過一級節(jié)流閥口的流量大于通過二級節(jié)流閥口的流量,二級節(jié)流閥口閥芯受到的液動力大于一級節(jié)流閥口閥芯受到的液動力,二級節(jié)流的抗氣蝕性能優(yōu)于一級節(jié)流。最后對提升閥口特性試驗裝置做了簡要的介紹,完成了對全文的總結(jié)。
[Abstract]:Water hydraulic technology has a very broad application prospect in many fields such as construction machinery, marine development, new energy utilization and so on, because of its advantages of green environmental protection, safety, high efficiency, low cost and so on. Water hydraulic control valve is a very important part of water hydraulic transmission technology. The development of high performance water hydraulic control valve must be the prerequisite for the wide application of water hydraulic drive technology. As the core of the research on hydraulic control valve, the characteristics of water pressure valve must be placed in the primary position. This paper makes a systematic simulation study on the common types of riser valves, and analyzes the characteristics of the valves according to the simulation results, which provides a certain reference for the selection and design of the hydraulic valves. The main work is as follows: the hydraulic characteristics of the orifice of the primary throttle valve are simulated, including the influence of the cone angle of the valve core and the chamfer length of the valve seat on the hydrodynamic characteristics of the valve. Through analysis, it is found that the increase of cone angle a will hinder the flow of fluid in the valve port and increase the force of the fluid acting on the valve core. On the contrary, the increase of the cone angle of the valve core will help to reduce the cavitation phenomenon inside the valve port. For the first-order tapered valve with chamfer, the increase of chamfer length has no obvious effect on the flow through the valve port and the fluid power acting on the valve core, but it is helpful to reduce the cavitation phenomenon inside the valve port. The hydraulic characteristics of ball valve and plate valve are simulated, and the influence of different valve core structure on the mechanical characteristics of valve saliva is analyzed. The flow rate of cone valve is more stable than that of ball valve, and the cavitation resistance of cone valve is obviously better than that of ball valve, but the hydraulic force of cone valve core is slightly higher than that of ball valve core. Considering the above three characteristics, the performance of cone valve is better than that of ball valve: further comparing the cone valve with the plate valve, the flow rate through the cone valve is smaller than that through the plate valve when the air holes occur inside the valve port. At the same time, when the inlet pressure is greater than 6MPa, the cone valve core is subjected to less hydraulic power than the flat valve core, and the cavitation resistance of the cone valve is better than that of the plate valve. Considering the above three characteristics, the cone valve performance is better than the plate valve. The simulation of the hydrodynamic characteristics of the two-stage throttle valve includes the influence of the cone angle of the valve core and the buffer angle of the valve mouth with the buffer slot on the mechanical characteristics of the valve saliva. It is found that under the same conditions, the increase of the cone angle a of the valve core will hinder the flow of the fluid in the valve orifice. When a is small, this hindrance can be neglected. On the contrary, the increase of the cone angle a of the valve core will reduce the hydraulic force of the valve core. At the same time, increasing the cone angle of the valve core helps to reduce the cavitation phenomenon in the valve orifice, and the increase of the buffer angle a has no obvious effect on the hydraulic power of the valve core under the same conditions for the two-stage throttle valve with buffer groove. The valve core with no buffer groove is subjected to a slightly greater hydraulic force than the valve core with a buffer groove. Under the same conditions, the cavitation resistance of the valve with small buffer angle is better than the cavitation resistance of the valve core. Two-stage throttle with no buffer slot, the cavitation resistance of the valve is between a =] 0. And a 15. Between. Under the same conditions, the flow through the orifice of the first throttle is greater than that through the orifice of the secondary throttle, and the fluid power of the spool of the secondary throttle is greater than that of the valve core of the orifice of the primary throttle. The anti-cavitation performance of two-stage throttling is better than that of one-stage throttling. Finally, a brief introduction is made to the test device of the riser port characteristics, and a summary of the full text is completed.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TH137.52

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