變頻多聯(lián)機(jī)系統(tǒng)控制策略及可靠性試驗(yàn)研究
發(fā)布時(shí)間：2019-05-01 06:47
【摘要】：變頻多聯(lián)機(jī)是目前中央空調(diào)市場(chǎng)主流的產(chǎn)品之一,近年的發(fā)展更是非常迅猛。目前多聯(lián)機(jī)的可靠性方面的研究還屬于起步階段,本文主要是從多聯(lián)機(jī)系統(tǒng)控制策略設(shè)計(jì)及系統(tǒng)選型方面對(duì)多聯(lián)機(jī)可靠性的影響進(jìn)行研究,主要采用試驗(yàn)的方法,先進(jìn)行控制及制冷系統(tǒng)設(shè)計(jì),通過(guò)一些理論計(jì)算分析,再配合大量可靠性實(shí)驗(yàn)來(lái)驗(yàn)證。這個(gè)過(guò)程雖然很耗時(shí),但從目前的情況來(lái)看不失為是一種有效的手段。本文主要從控制、制冷系統(tǒng)、結(jié)構(gòu)等幾個(gè)方面展開(kāi)可靠性實(shí)驗(yàn),具體如下：控制策略：對(duì)于變頻多聯(lián)機(jī)系統(tǒng)的控制是比較復(fù)雜的過(guò)程,本文主要針對(duì)其中對(duì)于可靠性影響最重要的幾個(gè)方面進(jìn)行研究及試驗(yàn)驗(yàn)證,主要有機(jī)組的啟動(dòng)、除霜的運(yùn)轉(zhuǎn)、對(duì)油的控制、相關(guān)的系統(tǒng)保護(hù)、壓縮機(jī)的驅(qū)動(dòng)的設(shè)計(jì)。除此之外控制邏輯決定了系統(tǒng)運(yùn)行的穩(wěn)定性和可靠性,它的設(shè)定主要是圍繞以壓縮機(jī)為主的制冷系統(tǒng)進(jìn)行,保證系統(tǒng)沒(méi)有回液、沒(méi)有回油,使壓縮機(jī)能夠正常運(yùn)轉(zhuǎn),在系統(tǒng)缺少冷媒的時(shí)候能夠有效進(jìn)行保護(hù)停機(jī),不會(huì)使壓縮機(jī)過(guò)熱損壞。通過(guò)試驗(yàn)證明控制的策略及方案可以保證系統(tǒng)可靠運(yùn)行選型方面：包括壓縮機(jī)、換熱器、膨脹閥、油分離器、氣液分離器、四通閥等主要部件。在這些部件里面,壓縮機(jī)是設(shè)計(jì)的核心,系統(tǒng)的回路、控制的方案很大程度上都是圍繞著壓縮機(jī)而展開(kāi)的�；芈分械囊恍┍Ｗo(hù)是以壓縮機(jī)的運(yùn)行范圍而設(shè)定,壓縮機(jī)的驅(qū)動(dòng)要保證壓縮機(jī)最大限度穩(wěn)定運(yùn)轉(zhuǎn),不過(guò)流、不退磁,控制邏輯是系統(tǒng)運(yùn)行的大腦,其設(shè)定同樣是圍繞壓縮機(jī)進(jìn)行,保證系統(tǒng)沒(méi)有回液,使壓縮機(jī)能夠正常運(yùn)轉(zhuǎn),在系統(tǒng)缺少冷媒的時(shí)候能夠有效進(jìn)行保護(hù)停機(jī),不會(huì)使壓縮機(jī)過(guò)熱損壞。結(jié)構(gòu)設(shè)計(jì)方面,通過(guò)軟件進(jìn)行應(yīng)力分析,初步設(shè)計(jì)好結(jié)構(gòu)之后,再進(jìn)行應(yīng)力、噪聲等方面的測(cè)試,通過(guò)測(cè)試的結(jié)果對(duì)鈑金、銅管等結(jié)構(gòu)部件進(jìn)行優(yōu)化。本文主要從控制策略為主的幾個(gè)方面進(jìn)行變頻多聯(lián)機(jī)系統(tǒng)設(shè)計(jì),并通過(guò)大量的試驗(yàn)進(jìn)行確認(rèn)。在控制策略方面采用了逐級(jí)遞增的壓縮機(jī)啟動(dòng)方式,系統(tǒng)能夠有效穩(wěn)定的啟動(dòng),除霜的過(guò)程采用智能控制有效地避免誤除霜,提升了除霜運(yùn)行的可靠性,同時(shí)采用定時(shí)回油循環(huán),保證系統(tǒng)運(yùn)轉(zhuǎn)過(guò)程中壓縮機(jī)不會(huì)缺油,對(duì)于壓縮機(jī)的保護(hù)從溫度、壓力、電流三大方面進(jìn)行,采用了先限、后降、再停的方式,最大限度保證系統(tǒng)運(yùn)轉(zhuǎn)又能有效進(jìn)行保護(hù),提高可靠性；系統(tǒng)的零部件選型主要是采用不重新發(fā)明輪子的方式,選擇市場(chǎng)經(jīng)過(guò)大量應(yīng)用的零部件,以保證可靠性。結(jié)構(gòu)方案主要是從噪聲、振動(dòng)、應(yīng)力三個(gè)方面進(jìn)行,采用了先建模、測(cè)試、改善的方法進(jìn)行,有效地保證了系統(tǒng)運(yùn)行的可靠性。
[Abstract]:Frequency conversion multi-on-line is one of the mainstream products in the central air-conditioning market at present, and the development in recent years is very rapid. At present, the research on reliability of multi-on-line is still in the initial stage. This paper mainly studies the influence of control strategy design and system selection of multi-online system on the reliability of multi-on-line, mainly using the method of experiment. The design of control and refrigeration system is carried out firstly, and verified by some theoretical calculation and analysis, and then with a large number of reliability experiments. This process, though time-consuming, is an effective tool in the light of the present situation. This paper mainly from the control, refrigeration system, structure and other aspects of reliability experiments, as follows: control strategy: for the frequency conversion multi-on-line system control is a more complex process, This paper mainly focuses on the most important aspects of reliability, such as the start-up of unit, defrosting operation, oil control, system protection and compressor drive design. In addition, the control logic determines the stability and reliability of the system operation, its setting is mainly around the compressor-based refrigeration system, to ensure that the system does not return fluid, there is no return of oil, so that the compressor can run normally. In the absence of refrigerant in the system can be effectively protected shutdown, will not overheat the compressor damage. It is proved by experiments that the control strategy and scheme can ensure the reliable operation and selection of the system, including compressor, heat exchanger, expansion valve, oil separator, gas-liquid separator, four-way valve and other main components. In these components, the compressor is the core of the design, the loop of the system, the control scheme is developed around the compressor to a large extent. Some of the protection in the circuit is based on the operating range of the compressor, the compressor drive to ensure the maximum stable operation of the compressor, but the flow, not demagnetization, control logic is the brain of the operation of the system. Its setting is also around the compressor to ensure that the system does not return fluid, so that the compressor can run normally, in the absence of refrigerant in the system can effectively protect the shutdown, will not make the compressor overheat damage. In the aspect of structural design, stress analysis is carried out by software, after preliminary design of the structure, stress, noise and other aspects are tested. The structural components such as sheet metal, copper pipe and so on are optimized by the test results. In this paper, the design of frequency conversion multi-on-line system is carried out mainly from several aspects of control strategy, and confirmed by a large number of experiments. In the aspect of control strategy, the compressor start-up mode is adopted step by step increasing step by step, the system can start up effectively and stably, and intelligent control is adopted to effectively avoid misdefrosting and improve the reliability of defrosting operation. At the same time, the timing oil return cycle is adopted to ensure that the compressor will not be short of oil during the operation of the system. The protection of the compressor is carried out from the three aspects of temperature, pressure and current, adopting the way of first limit, then drop, and then stop. Ensure the operation of the system to the maximum extent and can effectively protect and improve the reliability; The selection of parts and components of the system mainly adopts the way of not reinventing the wheel to select the parts which have been widely used in the market in order to ensure the reliability. The structural scheme is mainly carried out from the three aspects of noise, vibration and stress. The method of modeling, testing and improving is adopted to ensure the reliability of the system.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TB657.2
本文編號(hào)：2469089
[Abstract]:Frequency conversion multi-on-line is one of the mainstream products in the central air-conditioning market at present, and the development in recent years is very rapid. At present, the research on reliability of multi-on-line is still in the initial stage. This paper mainly studies the influence of control strategy design and system selection of multi-online system on the reliability of multi-on-line, mainly using the method of experiment. The design of control and refrigeration system is carried out firstly, and verified by some theoretical calculation and analysis, and then with a large number of reliability experiments. This process, though time-consuming, is an effective tool in the light of the present situation. This paper mainly from the control, refrigeration system, structure and other aspects of reliability experiments, as follows: control strategy: for the frequency conversion multi-on-line system control is a more complex process, This paper mainly focuses on the most important aspects of reliability, such as the start-up of unit, defrosting operation, oil control, system protection and compressor drive design. In addition, the control logic determines the stability and reliability of the system operation, its setting is mainly around the compressor-based refrigeration system, to ensure that the system does not return fluid, there is no return of oil, so that the compressor can run normally. In the absence of refrigerant in the system can be effectively protected shutdown, will not overheat the compressor damage. It is proved by experiments that the control strategy and scheme can ensure the reliable operation and selection of the system, including compressor, heat exchanger, expansion valve, oil separator, gas-liquid separator, four-way valve and other main components. In these components, the compressor is the core of the design, the loop of the system, the control scheme is developed around the compressor to a large extent. Some of the protection in the circuit is based on the operating range of the compressor, the compressor drive to ensure the maximum stable operation of the compressor, but the flow, not demagnetization, control logic is the brain of the operation of the system. Its setting is also around the compressor to ensure that the system does not return fluid, so that the compressor can run normally, in the absence of refrigerant in the system can effectively protect the shutdown, will not make the compressor overheat damage. In the aspect of structural design, stress analysis is carried out by software, after preliminary design of the structure, stress, noise and other aspects are tested. The structural components such as sheet metal, copper pipe and so on are optimized by the test results. In this paper, the design of frequency conversion multi-on-line system is carried out mainly from several aspects of control strategy, and confirmed by a large number of experiments. In the aspect of control strategy, the compressor start-up mode is adopted step by step increasing step by step, the system can start up effectively and stably, and intelligent control is adopted to effectively avoid misdefrosting and improve the reliability of defrosting operation. At the same time, the timing oil return cycle is adopted to ensure that the compressor will not be short of oil during the operation of the system. The protection of the compressor is carried out from the three aspects of temperature, pressure and current, adopting the way of first limit, then drop, and then stop. Ensure the operation of the system to the maximum extent and can effectively protect and improve the reliability; The selection of parts and components of the system mainly adopts the way of not reinventing the wheel to select the parts which have been widely used in the market in order to ensure the reliability. The structural scheme is mainly carried out from the three aspects of noise, vibration and stress. The method of modeling, testing and improving is adopted to ensure the reliability of the system.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TB657.2
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