壓力無關(guān)型定風(fēng)量控制閥設(shè)計(jì)研究
本文選題:定風(fēng)量控制閥 + 機(jī)械自力式原理; 參考:《中國礦業(yè)大學(xué)》2017年碩士論文
【摘要】:壓力無關(guān)型定風(fēng)量控制閥能夠自動調(diào)節(jié)通流面積以適應(yīng)閥門前后壓力的變化,在工作壓差范圍內(nèi)可以將流經(jīng)該閥的風(fēng)量控制在預(yù)先設(shè)定值,因而普遍應(yīng)用于醫(yī)院手術(shù)室、生化實(shí)驗(yàn)室和潔凈室等需要對氣流進(jìn)行準(zhǔn)確控制的場所。目前國內(nèi)壓力無關(guān)型定風(fēng)量控制閥市場被國外一些企業(yè)壟斷,國內(nèi)生產(chǎn)廠家由于未掌握核心技術(shù),在市場競爭中處于劣勢。近年來,我國暖通行業(yè)得到快速發(fā)展,市場對壓力無關(guān)型定風(fēng)量控制閥的需求不斷增長,迫切需要對該閥關(guān)鍵技術(shù)進(jìn)行深入研究。本文提出一種基于機(jī)械自力式原理的壓力無關(guān)型定風(fēng)量控制閥設(shè)計(jì)方案,通過建立其三維實(shí)體模型、流動數(shù)學(xué)模型和數(shù)值計(jì)算模型,分析閥門流場分布規(guī)律,對閥口參數(shù)進(jìn)行修正,具體工作包括:基于閥門流場分布提出一種結(jié)構(gòu)簡單、通流能力強(qiáng)、控制精度高的壓力無關(guān)型定風(fēng)量控制閥。該閥由閥體、閥芯、閥芯軸、壓縮彈簧、調(diào)節(jié)桿和支撐架等機(jī)構(gòu)組成,借助彈簧響應(yīng)閥門壓差變化來改變通流面積,以實(shí)現(xiàn)風(fēng)量調(diào)節(jié)的目的。根據(jù)流量與閥門壓力損失關(guān)系對該閥關(guān)鍵結(jié)構(gòu)進(jìn)行設(shè)計(jì)計(jì)算,主要包括閥口和機(jī)械自力式調(diào)節(jié)裝置的設(shè)計(jì)。利用Solid Works軟件建立壓力無關(guān)型定風(fēng)量控制閥三維實(shí)體模型,基于Ansys仿真軟件對該閥進(jìn)行仿真模擬,分析閥門流場分布和流量系數(shù)變化規(guī)律,修正閥門流量計(jì)算公式,并對閥口參數(shù)進(jìn)行修正。搭建壓力無關(guān)型定風(fēng)量控制閥流場和性能測試裝置,通過測量不同工況下的壓力分布和流量大小,探究仿真模型的可行性和閥門性能的可靠性。并將此研究結(jié)果應(yīng)用于定風(fēng)量控制閥系列產(chǎn)品的設(shè)計(jì)。
[Abstract]:The pressure-independent constant air volume control valve can automatically adjust the flow area to adapt to the change of the pressure before and after the valve. In the range of working pressure difference, the air flow through the valve can be controlled at a preset value, so it is widely used in the hospital operating room. Biochemical laboratories and cleanrooms, such as the need for accurate control of the air flow. At present, the domestic pressure independent constant air volume control valve market is monopolized by some foreign enterprises, and the domestic manufacturers are at a disadvantage in the market competition because they do not master the core technology. In recent years, with the rapid development of HVAC industry in China, the market demand for pressure-independent constant air volume control valve is increasing, so it is urgent to study the key technology of the valve. In this paper, a design scheme of pressure-independent constant air flow control valve based on the principle of mechanical self-force is proposed. Through the establishment of its three-dimensional solid model, flow mathematical model and numerical calculation model, the distribution law of valve flow field is analyzed. The main work of this paper is as follows: based on the distribution of valve flow field, a pressure-independent constant air volume control valve with simple structure, strong flow capacity and high control precision is proposed. The valve is composed of a valve body, a spool shaft, a compression spring, a regulating rod and a support frame, and the flow area is changed by means of the spring response to the pressure difference of the valve to achieve the purpose of air volume regulation. According to the relationship between the flow rate and the pressure loss of the valve, the key structure of the valve is designed and calculated, including the design of the valve opening and the mechanical self-regulating device. The three-dimensional solid model of pressure-independent constant air volume control valve is established by using solid works software. The valve is simulated and simulated based on Ansys software. The variation law of valve flow field and flow coefficient is analyzed, and the valve flow calculation formula is revised. And the valve parameters are modified. The flow field and performance test device of pressure independent constant air volume control valve was built. The feasibility of simulation model and the reliability of valve performance were explored by measuring the pressure distribution and flow rate under different working conditions. The results are applied to the design of the series of constant air volume control valves.
【學(xué)位授予單位】:中國礦業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TH134
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