CN103717980B - 用于制冷系统的启动逻辑 - Google Patents
用于制冷系统的启动逻辑 Download PDFInfo
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- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
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- F25B2500/00—Problems to be solved
- F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
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Abstract
一种制冷系统(10)包括:压缩机(20),其具有第一级(20a)和第二级(20b);排热换热器(40),其具有风扇(44),所述风扇(44)吸汲所述排热换热器上方的环境流体,所述排热换热器包括中间冷却器(43)和气体冷却器(41),所述中间冷却器耦接至所述第一级的出口以及所述气体冷却器耦接至所述第二级的出口;卸载阀(93),其耦接至所述中间冷却器的出口和所述第一级的吸气口;闪蒸罐(70),其耦接至所述气体冷却器的出口;初级膨胀装置(55),其耦接至所述闪蒸罐的出口;吸热换热器(50),其耦接至所述初级膨胀装置的出口,所述吸热换热器的出口耦接至所述第一级的所述吸气口;以及控制器(100),其用于执行启动过程。
Description
发明背景
实施方案大体上涉及制冷剂蒸汽压缩系统并且更特别地涉及用于制冷系统的启动操作。
制冷剂蒸汽压缩系统是本领域熟知的,并通常被用于将供应到住宅、办公楼、医院、学校、餐馆或其它设施内的气候受控舒适区的空气进行调节。制冷剂蒸汽压缩系统也常用于制冷供应到商业场所中的展示柜、商柜、冷冻柜、冷室或其它易腐/冷冻产品贮存区域的空气。
制冷剂蒸汽压缩系统也通常用于运输制冷系统以制冷供应到卡车、拖车、集装箱或类似物的温度受控货物空间的空气以通过卡车、铁路、船或联运装置运输易腐/冷冻物品。由于制冷剂蒸汽压缩系统操作以将货物空间内的产品维持在所需温度所处的广泛操作负荷条件和广泛户外环境条件,与运输制冷系统结合使用的制冷剂蒸汽压缩系统一般经受更严格的操作条件。取决于被保藏货物的性质,货物需要被控制的所需温度也可以在很宽的范围变化。制冷剂蒸汽压缩系统不但具有足够的容量以迅速拉下装载到环境温度下货物空间的产品温度,而且当在运输过程中维持稳定的产品温度时也有效地在低负荷下操作。此外,运输制冷剂蒸汽压缩系统经受静止制冷剂蒸汽压缩系统不会经历的震动和移动。
在某些条件(例如,具有低环境温度的低温箱设定点)下,制冷的集装箱系统可能会遇到严重的压缩机溢流情况。因此,由于液体的存在,可能会损坏该压缩机。内部密封或压缩机阀可能被毁坏。提高吸气过热以降低压缩机的风险的措施将在本领域中被很好地接受。
发明简述
根据本发明的一个方面,一种制冷系统包括:压缩机,其具有第一级和第二级;排热换热器,其具有吸汲排热换热器上方的环境流体的风扇,该排热换热器包括中间冷却器和气体冷却器,中间冷却器耦接至第一级的出口以及气体冷却器耦接至第二级的出口;卸载阀,其耦接至中间冷却器的出口和第一级的吸气口;闪蒸罐,其耦接至气体冷却器的出口;初级膨胀装置,其耦接至闪蒸罐的出口;吸热换热器,其耦接至初级膨胀装置的出口,吸热换热器的出口耦接至第一级的吸气口;以及控制器,其用于执行启动过程,启动过程包括下列项中的至少一个:控制风扇速度以减少排热换热器中的制冷剂热量损失;控制卸载阀以将制冷剂从中间冷却器引导至第一级的吸气口;以及控制初级膨胀装置以限制制冷剂到吸热换热器的流量。
根据结合附图进行的以下描述,这些和其它优点和特征将变得更加明显。
附图简述
在说明书开始处的权利要求中特别地指出被看作是本发明的主题并且明确要求保护该主题。根据结合附图进行的以下详细描述,本发明的前述以及其它特征和优点是明显的,在附图中:
图1是示出制冷剂蒸汽压缩系统的示例性实施方案的示意图;以及
图2描绘了图1的系统的示例性启动操作。
通过参照附图的实例,在发明详述部分解释了本发明的实施方案连同优点和特征。
发明详述
图1描绘制冷剂蒸汽压缩系统10的示例性实施方案,制冷剂蒸汽压缩系统10适合用于运输制冷系统以制冷卡车、拖车、集装箱或类似物的温度受控货物空间内的空气或其它气态大气从而运输易腐/冷冻品。制冷剂蒸汽压缩系统10也适用于将供应到住宅、办公楼、医院、学校、餐馆或其它设施内的气候受控舒适区的空气进行调节。制冷剂蒸汽压缩系统也可被采用从而制冷供应到商业场所中的展示柜、商柜、冷冻柜、冷室或其它易腐/冷冻产品贮存区的空气。
制冷剂蒸汽压缩系统10特别适合于用低临界温度制冷剂(例如但不限于二氧化碳)在跨临界循环中操作。制冷剂蒸汽压缩系统10包括多级压缩机20、制冷剂排热换热器40、制冷剂吸热换热器50(本文也称为蒸发器)和初级膨胀装置55(例如电子式膨胀阀或恒温膨胀阀),初级膨胀装置55可操作地与蒸发器50相关联、具有连接初级制冷剂回路中的上述部件的制冷剂管线2、4和6。
排热换热器40包括气体冷却器41和中间冷却器43,与冷却介质(诸如但不限于环境空气)有热交换关系。风扇44吸汲气体冷却器41和中间冷却器43上方的空气以从通过气体冷却器41和/或中间冷却器43的制冷剂去除热量。风扇44是可控的,并且可以是以第一(例如,低)和第二(例如,高)速度操作的双速风扇。可替换地,风扇44是具有可由电子驱动信号控制的众多风扇速度的可变速风扇。
制冷剂吸热换热器50充当蒸发器,其中液体制冷剂通过时与将冷却的流体(最常见为空气)有热交换关系、从温度受控环境吸汲和返回到温度受控环境(诸如制冷运输卡车、拖车或集装箱的货箱或商业场所中的展示柜、商柜、冷冻柜、冷室或其它易腐/冷冻产品贮存区域)或者从住宅、办公楼、医院、学校、餐馆或其它设施内的气候受控舒适区吸汲和返回到该气候受控舒适区。在所描绘的实施方案中,制冷剂吸热换热器50包括翅片管式换热器,制冷剂通过翅片管式换热器时与空气有热交换关系,空气由与蒸发器50相关联的蒸发器风扇54从制冷货箱吸汲以及返回到制冷货箱。翅片管式换热器可包括例如翅片和圆形管换热盘管或翅片和微通道扁平管换热器。风扇54是可控的,并可是以第一(例如,低)和第二(例如高)速度操作的双速风扇。可替换地,风扇44是具有可由电子驱动信号控制的众多风扇速度的可变速风扇。
压缩装置20运行以压缩制冷剂并且使制冷剂循环通过初级制冷剂回路,如将在下文中进一步详细讨论的。压缩装置20可包括单个多级制冷剂压缩机(例如涡旋式压缩机、螺旋式压缩机或往复式压缩机),其设置在初级制冷剂回路并具有第一压缩级20a和第二压缩级20b。可替代地,压缩装置20可包括一对独立的压缩机20a和20b。在独立的压缩机实施方案中,压缩机20a和20b可以是涡旋式压缩机、螺旋式压缩机、往复式压缩机、旋转式压缩机或任何其它类型的压缩机或任何此类压缩机的组合。在两级可变速压缩机20的第一级20a中,制冷剂从吸入压力压缩到中间级压力。然后在中间冷却器43经由制冷剂管线8冷却制冷剂。然后制冷剂经由制冷剂管线16进入第二级压缩机20b或取决于节能器阀73是打开还是关闭与来自闪蒸罐70的制冷剂一起或不一起。该制冷剂被压缩以排出第二级压缩机20b的压力并然后在气体冷却器41中被冷却。
电动机22驱动压缩机20a和20b。电动机22可以是但无须一定是可变频驱动(VFD)电动机,其能够取决于操作要求而在多种速度下操作,如本文中进一步详细描述的。VFD驱动单元21从控制器100接收驱动信号并且将适当的电动机控制信号应用到电动机22。
此外,制冷剂蒸汽压缩系统10包括闪蒸罐70,其被插置于初级制冷剂回路的制冷剂管线4中,相对于气体冷却器41的制冷剂流动的下游和相对于蒸发器50的制冷剂流动的上游。次级膨胀装置65被插置于制冷剂管线4中、在操作中与闪蒸罐70关联并在其上游。次级膨胀装置65可以是电子膨胀阀或固定节流孔膨胀装置。穿过次级膨胀装置65的制冷剂被膨胀到足以建立蒸汽状态的制冷剂和液体状态的制冷剂的混合物的较低压力。闪蒸罐70限定分离腔室,其中液体状态的制冷剂聚集在分离腔室的下部且蒸汽状态的制冷剂聚集在分离腔室中液体制冷剂上方的部分。
聚集在闪蒸罐70的下部的液体制冷剂由此通过制冷剂管线4并穿过初级膨胀装置55,初级膨胀装置55被插置于制冷剂管线4中、相对于蒸发器50的制冷剂流动的上游。在此液体制冷剂穿过初级膨胀装置55时,它在进入蒸发器50之前膨胀到较低压力和温度。蒸发器50构成制冷剂蒸发换热器,膨胀的制冷剂通过制冷剂蒸发换热器时与将被冷却的空气有热交换关系,由此制冷剂被蒸发且通常是过热的。如在常规实践中,初级膨胀装置55计量通过制冷剂管线4的制冷剂流以将离开蒸发器50的制冷剂蒸汽维持在所需的过热水平,以确保没有液体存在于离开蒸发器50的制冷剂中。离开蒸发器50的低压制冷剂蒸汽通过制冷剂管线6返回到压缩装置20的第一压缩级20a的吸气口。
制冷剂蒸汽压缩系统10也包括制冷剂蒸汽注入管线14。制冷剂蒸汽注入管线14建立闪蒸罐70的分离腔室的上部和压缩机20的第二级20b之间的制冷剂流动连通。制冷剂蒸汽注入管线14包括节能器阀73,其在某些操作条件下打开,如本文中进一步详细描述的。节能器阀73可以是可定位为打开或关闭的电磁阀。可替换地,节能器阀73是可定位在众多操作位置中的步进阀。
制冷剂蒸汽压缩系统10也可以包括压缩机卸载旁通管线16。压缩机20的第一级20a的排出经制冷剂管线8耦接到中间冷却器43。卸载旁通管线16通过卸载阀93将中间冷却器43的出口耦接到第一压缩级20a的吸入部。卸载阀93可以是可定位为打开或关闭的电磁阀。可替换地,卸载阀93是可定位在众多操作位置中的步进阀。
制冷剂蒸汽压缩系统10包括控制器100。控制器100控制各流量控制阀73和93的操作以选择性地引导制冷剂流过制冷剂蒸汽注入管线14和卸载旁通管线16,但也可以控制电子膨胀装置55和65、压缩机20以及风扇44和54的操作。如在常规实践中,除了监控环境条件之外,控制器100也借助于可操作地与控制器100相关联并且设置在整个系统中的选定位置的各种传感器来监控各种操作参数。例如,在图1所示的示例性实施方案中,压力传感器102被设置为在操作中与闪蒸罐70相关联以感测闪蒸罐70内的压力,压力传感器104被提供以感测制冷剂吸入压力,以及压力传感器106被提供以感测制冷剂排出压力。压力传感器102、104、106可以是常规压力传感器,例如压力换能器。另外,整个蒸发器的温度由回风温度传感器110和供给温度传感器112来测量。温度传感器110和112可以是常规温度传感器,例如热电偶或热敏电阻。
如上所述,在某些条件(低设定点和低环境温度)期间运输制冷单元可能会遇到压缩机溢流。这可能是由于冷冻货物使蒸发器和压缩机相当冷的事实。在启动时,需要使用一种或多种措施来提高压缩机20中吸入气体的过热。图2是可被用于在启动时提高压缩机20和系统中流动的制冷剂的温度的一些技术的工序图。由于制冷剂残留有一定度数的正过热,压缩机和/或制冷剂的温度升高降低了压缩机溢流的可能性。参照图2描述的技术可以以任意顺序进行应用,并且可以同时进行应用,并且图2中的技术介绍没有建议该技术的任何顺序。另外,可采用图2中的技术中的一种、全部或任意数量。
如图2所示,在关断周期期间使用的技术是施加直流到电动机22,如200处所示。电动机22可以是VFD电动机,意味着交流信号被用于转动电动机。由于电动机绕组作为电阻加热器,故施加直流信号到电动机22产生热量,而不使电动机驱动压缩机。当系统关断时,加热电动机22降低了液体制冷剂到压缩机20的迁移发生。
在启动时使用的另一种技术包括打开卸载阀93和在低速(即低频率驱动信号)下操作电动机22,如202处所示。这使制冷剂循环通过中间冷却器43、卸载旁通管线16和卸载阀93返回到第一级压缩机20a的吸气口。在低速下操作以及卸载阀打开允许电动机22进行预热,而无需从蒸发器50拉动制冷剂,蒸发器50在启动时通常相当凉。
在启动时使用的另一种技术是控制初级膨胀装置55,使得在启动时很少或没有制冷剂进入蒸发器50,如204处所示。如上所述,蒸发器50在启动时通常相当冷。防止制冷剂进入蒸发器50可防止冷的制冷剂到达第一压缩机级20a的吸气口,从而有利于提高压缩机和制冷剂的温度。初级膨胀装置55的位置由控制器100响应于过热的测量来控制。可以基于蒸发器处或沿着吸气管线6的任意位置或压缩机20内部的温度以及来自压力传感器104的吸入压力来确定过热。在过热提高时,初级膨胀装置55可以以过热和初级膨胀装置55的流速成正比的方式被递增地打开。
在启动时使用的另一种技术包括控制排热换热器40处的风扇44的速度,如206处所示。在启动时,风扇44可以被关闭或在降低的速度下运行,而系统在卸载模式中运行,其中卸载阀93打开。可替换地,风扇44可以被关闭或在降低的速度下运行,而系统在标准模式中运行,其中卸载阀93关闭。这允许制冷剂管线8中的制冷剂在通过中间冷却器43时保留有第一级压缩20a期间产生的压缩热。在过热提高时,风扇44的速度被增加。如果风扇44是双速风扇,那么风扇可被设定为低速。如果风扇44是可变速风扇,那么风扇速度可以增加一定的百分比。在系统进入正常操作模式时,风扇44在高速下运行。
在启动时使用的另一种技术是打开节能器阀73,如208处所示。由于在启动时关闭或抑制初级膨胀装置55,流入闪蒸罐70的制冷剂被限制通过初级膨胀阀55退出。控制节能器阀73可防止临界制冷剂进入压缩机。
应理解,图2所示的启动时使用的技术可以响应于例如环境条件和/或将被调节的区域中的条件而变化。可以采用比图2所示的所有技术更少的技术。此外,图2中的操作顺序没有限制,因为该技术可以以任意顺序进行应用。
虽然仅结合有限数量的实施方案对本发明进行了详细描述,但是应容易理解,本发明并不限于这些公开的实施方案。相反,本发明可以被修改以涵盖任何数量的变化、变更、替换或之前未予描述但与本发明的精神和范围相称的等效布置。另外,虽然对本发明的各种实施方案进行了描述,但是应当理解,本发明的方面可仅包括所述实施方案中的一些。因此,本发明不应被视为局限于前面的描述,而是仅由所附权利要求的范围限制。
Claims (12)
1.一种制冷系统,其包括:
压缩机,其具有第一级和第二级;
排热换热器,其具有风扇,所述风扇吸汲所述排热换热器上方的环境流体,所述排热换热器包括中间冷却器和气体冷却器,所述中间冷却器耦接到所述第一级的出口和所述气体冷却器耦接到所述第二级的出口;
卸载阀,其耦接至所述中间冷却器的出口和所述第一级的吸气口;
闪蒸罐,其耦接到所述气体冷却器的出口;
初级膨胀装置,其耦接到所述闪蒸罐的出口;
吸热换热器,其耦接到所述初级膨胀装置的出口,所述吸热换热器的出口耦接到所述第一级的所述吸气口;以及
控制器,其用于执行启动过程,所述启动过程包括下列项中的至少一个:
控制所述风扇速度以减少所述排热换热器中的制冷剂热量损失;
控制所述卸载阀以将制冷剂从所述中间冷却器引导至所述第一级的所述吸气口;以及
控制所述初级膨胀装置以限制制冷剂到所述吸热换热器的流量。
2.如权利要求1所述的制冷系统,其中:
所述启动过程包括下列项中的至少两个:
控制所述风扇速度以减少所述排热换热器中的制冷剂热量损失;
控制所述卸载阀以将制冷剂从所述中间冷却器引导至所述第一级的所述吸气口;以及
控制所述初级膨胀装置以限制制冷剂到所述吸热换热器的流量。
3.如权利要求1所述的制冷系统,其中:
所述启动过程包括所有下列项:
控制所述风扇速度以减少所述排热换热器中的制冷剂热量损失;
控制所述卸载阀以将制冷剂从所述中间冷却器引导至所述第一级的所述吸气口;以及
控制所述初级膨胀装置以限制制冷剂到所述吸热换热器的流量。
4.如权利要求1所述的制冷系统,其还包括:
节能器阀,其将所述闪蒸罐耦接到所述第二级的入口。
5.如权利要求4所述的制冷系统,其中:
所述启动过程包括控制所述节能器阀以控制制冷剂从所述闪蒸罐到所述第二级的所述入口的流量。
6.如权利要求5所述的制冷系统,其中:
控制所述节能器阀包括打开所述节能器阀。
7.如权利要求1所述的制冷系统,其还包括:
电动机,其用于驱动所述第一级和所述第二级;
所述启动过程包括施加直流电到所述电动机。
8.如权利要求1所述的制冷系统,其中:
控制所述风扇速度包括响应于过热来控制风扇速度。
9.如权利要求8所述的制冷系统,其中:
所述风扇速度与所述过热成比例。
10.如权利要求1所述的制冷系统,其中:
控制所述卸载阀包括打开所述卸载阀。
11.如权利要求1所述的制冷系统,其中:
控制所述初级膨胀装置包括响应于过热控制初级膨胀装置。
12.如权利要求11所述的制冷系统,其中:
控制所述初级膨胀装置响应于提高过热而递增地打开所述初级膨胀装置。
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WO2013016404A1 (en) | 2013-01-31 |
US9739519B2 (en) | 2017-08-22 |
EP2737264B1 (en) | 2020-07-22 |
CN103717980A (zh) | 2014-04-09 |
US20140150489A1 (en) | 2014-06-05 |
DK2737264T3 (en) | 2020-10-26 |
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