Article(id=1320037724724253265, tenantId=1146029695717560320, journalId=1316781260334530699, issueId=1320037688510628614, articleNumber=null, orderNo=null, doi=10.3969/j.issn.1005-0329.2026.04.003, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1754323200000, receivedDateStr=2025-08-05, revisedDate=1773676800000, revisedDateStr=2026-03-17, acceptedDate=null, acceptedDateStr=null, onlineDate=1792651118689, onlineDateStr=2026-10-22, pubDate=1777478400000, pubDateStr=2026-04-30, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792651118689, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792651118689, creator=13701087609, updateTime=1792651118689, updator=13701087609, issue=Issue{id=1320037688510628614, tenantId=1146029695717560320, journalId=1316781260334530699, year='2026', volume='54', issue='4', pageStart='1', pageEnd='118', issueExtLink='null', onlineDate='null', pubDate='1777478400000', pubDateStr='2026-04-30', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792651110055, creator='13701087609', updateTime=1792656236652, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1320059191075656665, tenantId=1146029695717560320, journalId=1316781260334530699, issueId=1320037688510628614, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1320059191075656666, tenantId=1146029695717560320, journalId=1316781260334530699, issueId=1320037688510628614, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=19, endPage=25, ext={EN=ArticleExt(id=1320037724908802642, articleId=1320037724724253265, tenantId=1146029695717560320, journalId=1316781260334530699, language=EN, title=Experimental study on optimization of liquid separation device in transport refrigeration unit, columnId=null, journalTitle=Fluid Machinery, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To address the issue of uneven refrigerant flow distribution in conventional venturi type liquid separators under low evaporation temperature conditions,as well as the resulting technical bottlenecks in transport refrigeration units operating in freezing mode,such as insufficient cooling capacity and excessively high discharge temperature,a liquid separation device with gas‑liquid separation functionality was designed.This device replaced the original venturi type liquid separator in the unit.A performance test bench was constructed,and experimental tests were conducted under both refrigeration mode and freezing mode.The experimental results indicate that compared with the original unit using the venturi type liquid separator,the unit equipped with the new liquid separator exhibited a significant increase in cooling capacity with increasing bypass regulating valve opening,while the discharge temperature first increased and then decreased.At a bypass regulating valve opening of 20%,the cooling capacity in refrigeration mode increased by 30.6% accompanied by a discharge temperature rise of approximately 6 ℃,while in freezing mode the cooling capacity increased by 38.6% accompanied by a discharge temperature rise of approximately 4 ℃.At a bypass regulating valve opening of 40%,the cooling capacity in refrigeration mode increased by 21.0% with a discharge temperature decrease of approximately 11 ℃,while in freezing mode the cooling capacity increased by 16.0% with a discharge temperature decrease of approximately 10 ℃.This study provides a technical solution for the efficient and stable operation of transport refrigeration units.

, authors=Siqi CUI, Kaikun WANG, Jing BAI, Mingzhi CHEN, Bobo LI, Tianzhen ZHANG, Huifan ZHENG, Kexuan GU, authorsList=Siqi CUI, Kaikun WANG, Jing BAI, Mingzhi CHEN, Bobo LI, Tianzhen ZHANG, Huifan ZHENG, Kexuan GU, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1320037728402657891, articleId=1320037724724253265, tenantId=1146029695717560320, journalId=1316781260334530699, language=CN, title=运输用制冷机组中分液装置优化的试验研究, columnId=1317484286475883136, journalTitle=流体机械, columnName=试验研究, runingTitle=null, highlight=null, articleAbstract=

针对传统文丘里分液头在蒸发温度较低工况下存在的制冷剂流量分配不均问题,及其导致运输用制冷机组在冷冻模式运行时出现制冷量不足、排气温度过高等技术瓶颈,设计了一款具备气液分离功能的分液装置,对原有机组文丘里分液头进行了替换,搭建了性能测试试验台,进行了冷藏模式和冷冻模式下的试验测试。试验结果表明,相较于采用文丘里分液头的原机组,采用新型分液头的机组随着旁通调节阀开度的增大,制冷量显著提升,而排气温度先增加后降低;在20%旁通调节阀开度时,冷藏模式下制冷量提高30.6%、排气温度上升约6 ℃,冷冻模式下制冷量提高38.6%、排气温度上升约4 ℃;在40%旁通调节阀开度时,冷藏模式下制冷量提高21.0%、排气温度下降约11 ℃,冷冻模式下制冷量提高16.0%、排气温度下降约10 ℃。研究为运输制冷机组的高效稳定运行提供技术解决方案。

, authors=崔四齐, 王凯坤, 白静, 陈明志, 李博博, 张天臻, 郑慧凡, 谷可轩, authorsList=崔四齐, 王凯坤, 白静, 陈明志, 李博博, 张天臻, 郑慧凡, 谷可轩, authorCompany=null, correspAuthors=null, authorNote=

崔四齐(1979),男,副教授,主要从事运输用制冷机组系统的研究工作,通信地址:450007河南省郑州市中原中路41号中原工学院智慧能源与环境学院,E-mail:。

, correspAuthorsNote=null, copyrightStatement=作者向本刊所投稿件一经本刊录用,则该论文的复制权、发行权、信息网络传播权、翻译权、汇编权等权利视为自动转让给本刊。本刊为国内各主要数据库收录期刊,本刊所发表的稿件将同时通过互联网进行网络出版或提供信息服务。, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=PctOSjeK/oePX24Z2wB75w==, magXml=N24bewoBux91CsnFmeDkNg==, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=jryi7QrDLXhBI6vX5Vc4NQ==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=otPD951lJkC/tIfZysKWVw==, mapNumber=null, fund=null)}, authors=[Author(id=1320037728910168680, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037724724253265, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=13783568150@126.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1320037729002443370, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037724724253265, authorId=1320037728910168680, language=EN, stringName=Siqi CUI, firstName=Siqi, middleName=null, lastName=CUI, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=School of Smart Energy and Environment,Zhongyuan University of Technology,Zhengzhou 450007,China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1320037729174409835, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037724724253265, authorId=1320037728910168680, language=CN, stringName=崔四齐, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=中原工学院 智慧能源与环境学院,郑州 450007, bio={"content":"

崔四齐(1979),男,副教授,主要从事运输用制冷机组系统的研究工作,通信地址:450007河南省郑州市中原中路41号中原工学院智慧能源与环境学院,E-mail:。

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崔四齐(1979),男,副教授,主要从事运输用制冷机组系统的研究工作,通信地址:450007河南省郑州市中原中路41号中原工学院智慧能源与环境学院,E-mail:。

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Refrigeration,2019,40(4):153-158., articleTitle=null, refAbstract=null), Reference(id=1320037740981375691, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037724724253265, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=17, rfOrder=28, authorNames=null, journalName=null, refType=null, unstructuredReference=万夏红,黄云材,孙弘历.压降型分液器喷嘴孔径对工业特种空调系统性能的影响[J].制冷与空调,2026,26(1):85-88., articleTitle=null, refAbstract=null), Reference(id=1320037741052678860, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037724724253265, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=17, rfOrder=29, authorNames=null, journalName=null, refType=null, unstructuredReference=WAN X H,HUANG Y C,SUN H L,et al.Influence of nozzle orifice diameter of pressure‑drop type distributoron performance of industrial 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language=CN, label=图8, caption=冷冻模式下2种不同分液头的机组排气温度对比, figureFileSmall=W//WhnBres9RxYUmdYgGdg==, figureFileBig=4VCdlVcpG9LpmTTKt5T+Gw==, tableContent=null), ArticleFig(id=1320037736652853929, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037724724253265, language=EN, label=Tab.1, caption=

Relevant parameters of the main test equipment

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设备名称参数
压缩机
(广州光裕汽车空调制造有限公司)
轴向活塞式压缩机,型号:GY.17.6101,额定制冷量5.6 kW,理论排量177 ml,额定转速2 000 r/min
换热器
(广州光裕汽车空调制造有限公司)
冷凝器选用全铝微通道平行流换热器,冷凝器为两流程(20-10),蒸发器选用铜管铝翅片换热器,蒸发器为三流程(8-8-8)
电子膨胀阀(浙江三花智控公司)型号:DPF(TS1)2.0C-33,最大工作压差3.5 MPa
蒸发风机/冷凝风机(长沙伟力公司)型号:LNF2209BF2轴流风机(蒸发器用),LNF2201XF3轴流风机(冷凝器用)
回热器(佛山华腾制冷设备有限公司)LF8W5A-03-9.52型壳盘管式回热器
温度传感器(开普森)型号:KAIPUSEN Pt1000,工作范围-50~200 ℃,精度:±0.1 ℃
压力传感器〔艾默生(EMERSON)公司〕型号:PT5N系列,量程规格:1.8 MPa,5.0 MPa,工作范围-40~135 ℃,精度:±1%FS
数据采集仪(宁波科顺)型号:KSA系列,精度:±0.2%FS
), ArticleFig(id=1320037736724157098, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037724724253265, language=CN, label=表1, caption=

主要试验设备相关参数

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设备名称参数
压缩机
(广州光裕汽车空调制造有限公司)
轴向活塞式压缩机,型号:GY.17.6101,额定制冷量5.6 kW,理论排量177 ml,额定转速2 000 r/min
换热器
(广州光裕汽车空调制造有限公司)
冷凝器选用全铝微通道平行流换热器,冷凝器为两流程(20-10),蒸发器选用铜管铝翅片换热器,蒸发器为三流程(8-8-8)
电子膨胀阀(浙江三花智控公司)型号:DPF(TS1)2.0C-33,最大工作压差3.5 MPa
蒸发风机/冷凝风机(长沙伟力公司)型号:LNF2209BF2轴流风机(蒸发器用),LNF2201XF3轴流风机(冷凝器用)
回热器(佛山华腾制冷设备有限公司)LF8W5A-03-9.52型壳盘管式回热器
温度传感器(开普森)型号:KAIPUSEN Pt1000,工作范围-50~200 ℃,精度:±0.1 ℃
压力传感器〔艾默生(EMERSON)公司〕型号:PT5N系列,量程规格:1.8 MPa,5.0 MPa,工作范围-40~135 ℃,精度:±1%FS
数据采集仪(宁波科顺)型号:KSA系列,精度:±0.2%FS
), ArticleFig(id=1320037736803848875, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037724724253265, language=EN, label=Tab.2, caption=

Test conditions

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试验条件室内干球温度/℃室内相对湿度/%室外干球温度/℃新型分液头旁通调节阀开度
冷藏模式090300%,20%,40%
冷冻模式-20904520%,40%
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测试工况

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试验条件室内干球温度/℃室内相对湿度/%室外干球温度/℃新型分液头旁通调节阀开度
冷藏模式090300%,20%,40%
冷冻模式-20904520%,40%
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运输用制冷机组中分液装置优化的试验研究
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崔四齐 , 王凯坤 , 白静 , 陈明志 , 李博博 , 张天臻 , 郑慧凡 , 谷可轩
流体机械 | 试验研究 2026,54(4): 19-25
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流体机械 |试验研究 2026 , 54 (4) : 19 -25
运输用制冷机组中分液装置优化的试验研究
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崔四齐(1979),男,副教授,主要从事运输用制冷机组系统的研究工作,通信地址:450007河南省郑州市中原中路41号中原工学院智慧能源与环境学院,E-mail:。

"}, bioImg=null, bioContent=

崔四齐(1979),男,副教授,主要从事运输用制冷机组系统的研究工作,通信地址:450007河南省郑州市中原中路41号中原工学院智慧能源与环境学院,E-mail:。

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崔四齐 , 王凯坤, 白静, 陈明志, 李博博, 张天臻, 郑慧凡, 谷可轩
作者信息
  • 中原工学院 智慧能源与环境学院,郑州 450007
作者简介:

崔四齐(1979),男,副教授,主要从事运输用制冷机组系统的研究工作,通信地址:450007河南省郑州市中原中路41号中原工学院智慧能源与环境学院,E-mail:。

Experimental study on optimization of liquid separation device in transport refrigeration unit
Siqi CUI , Kaikun WANG, Jing BAI, Mingzhi CHEN, Bobo LI, Tianzhen ZHANG, Huifan ZHENG, Kexuan GU
Affiliations
  • School of Smart Energy and Environment,Zhongyuan University of Technology,Zhengzhou 450007,China
出版时间: 2026-04-30 doi: 10.3969/j.issn.1005-0329.2026.04.003
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针对传统文丘里分液头在蒸发温度较低工况下存在的制冷剂流量分配不均问题,及其导致运输用制冷机组在冷冻模式运行时出现制冷量不足、排气温度过高等技术瓶颈,设计了一款具备气液分离功能的分液装置,对原有机组文丘里分液头进行了替换,搭建了性能测试试验台,进行了冷藏模式和冷冻模式下的试验测试。试验结果表明,相较于采用文丘里分液头的原机组,采用新型分液头的机组随着旁通调节阀开度的增大,制冷量显著提升,而排气温度先增加后降低;在20%旁通调节阀开度时,冷藏模式下制冷量提高30.6%、排气温度上升约6 ℃,冷冻模式下制冷量提高38.6%、排气温度上升约4 ℃;在40%旁通调节阀开度时,冷藏模式下制冷量提高21.0%、排气温度下降约11 ℃,冷冻模式下制冷量提高16.0%、排气温度下降约10 ℃。研究为运输制冷机组的高效稳定运行提供技术解决方案。

制冷机组  /  分液头  /  优化  /  制冷量  /  排气温度

To address the issue of uneven refrigerant flow distribution in conventional venturi type liquid separators under low evaporation temperature conditions,as well as the resulting technical bottlenecks in transport refrigeration units operating in freezing mode,such as insufficient cooling capacity and excessively high discharge temperature,a liquid separation device with gas‑liquid separation functionality was designed.This device replaced the original venturi type liquid separator in the unit.A performance test bench was constructed,and experimental tests were conducted under both refrigeration mode and freezing mode.The experimental results indicate that compared with the original unit using the venturi type liquid separator,the unit equipped with the new liquid separator exhibited a significant increase in cooling capacity with increasing bypass regulating valve opening,while the discharge temperature first increased and then decreased.At a bypass regulating valve opening of 20%,the cooling capacity in refrigeration mode increased by 30.6% accompanied by a discharge temperature rise of approximately 6 ℃,while in freezing mode the cooling capacity increased by 38.6% accompanied by a discharge temperature rise of approximately 4 ℃.At a bypass regulating valve opening of 40%,the cooling capacity in refrigeration mode increased by 21.0% with a discharge temperature decrease of approximately 11 ℃,while in freezing mode the cooling capacity increased by 16.0% with a discharge temperature decrease of approximately 10 ℃.This study provides a technical solution for the efficient and stable operation of transport refrigeration units.

refrigeration unit  /  liquid separator  /  optimization  /  cooling capacity  /  discharge temperature
崔四齐, 王凯坤, 白静, 陈明志, 李博博, 张天臻, 郑慧凡, 谷可轩. 运输用制冷机组中分液装置优化的试验研究. 流体机械, 2026 , 54 (4) : 19 -25 . DOI: 10.3969/j.issn.1005-0329.2026.04.003
Siqi CUI, Kaikun WANG, Jing BAI, Mingzhi CHEN, Bobo LI, Tianzhen ZHANG, Huifan ZHENG, Kexuan GU. Experimental study on optimization of liquid separation device in transport refrigeration unit[J]. Fluid Machinery, 2026 , 54 (4) : 19 -25 . DOI: 10.3969/j.issn.1005-0329.2026.04.003
随着冷链运输行业的飞速发展,冷链运输的内容与场景不断变化,传统冷链制冷机组无法满足行业现有需求,在长期运行中普遍存在制冷量不足、制冷温域窄、环境适应能力差等问题[1-5],因此,运输用制冷机组的相关部件优化设计尤为重要。其中安装在节流阀与蒸发器之间的分液头,是制冷机组中负责将气液两相制冷剂均匀分配到各蒸发回路的关键部件,其性能直接影响蒸发器的换热效率、系统制冷量及运行稳定性。但传统分液头依赖流体自然分流,对制冷剂的气液两相状态、流速、压力波动敏感,难以适应变工况运行,出现分液头无法均匀分配气液两相制冷剂,导致蒸发器局部过热或过冷,蒸发器整体换热量下降、效率降低[6-7]。
国内外很多学者针对分液头进行了相关技术研究。ZHANG等[8]提出了一种双筒型分液头,研究表明,双筒型分液头能够减少由于制冷剂流速低而引起的分配不均,随着制冷剂流速的增加,分液头效果更加显著。梁俊杰等[9-10]对分液器的安装角度进行了研究,结果表明,分液器的垂直安装对其分配性能具有显著影响,通过优化控制安装倾斜角度并维持其竖直状态,可有效提升分配均匀性。韩清等[11-12]研究了不同类型分液器(压降型、离心型、贮液型)的分配特性,研究表明,随着质量流量升高,压降型与离心型分液器的流量均匀性提升幅度较大,而贮液型分液器对此参数敏感性较弱;同时,入口干度增加会普遍降低各类分液器的分配均匀性。高晶丹等[13-14]研究表明,插孔式分液器的分配效率与两相流体流量呈正相关,且在垂直安装条件下表现最优,随着安装倾斜角度的增加,其性能呈现逐步下降趋势。林竹等[15]通过改进圆锥式分流器的结构参数与流道配置,有效提升了环状流体的分布均衡性,研究表明,经优化设计的分配装置其流量偏差系数较原型减小51%。赵定乾等[16]研究了分流装置基于环状流构建与均衡分配原理,试验结果表明,在制冷剂质量流量处于14~22 g/s区间时,新型分流器在水平、倾斜及垂直安装状态下的流量分配不均匀度指标,较传统圆锥型分流装置分别实现了10%~24%,14%~27%和24%~47%的显著改善。万夏红等[17]对分液头喷嘴孔径进行了研究,结果表明,分液器喷嘴孔径过小或过大均会导致变频压缩机运行转速低于设计转速,引发制冷量降低12.9%~21.2%。
基于目前分液头的研究现状可知,优化分液头结构设计或安装角度,可提高分液头分配的均匀性,但蒸发温度较低时,由于进入分液头的制冷剂干度较大、质量流量较低,导致蒸发器各回路制冷剂流量分配不均的问题,仍未得到有效解决。同时,由于进入蒸发器内制冷剂气态占比过高,导致液态制冷剂无法充分湿润换热管内壁,使换热系数下降,进而影响蒸发器的换热量。因此,本文针对运输用制冷机组提出一种气液分离型分液头,设置专门的气液分离腔,当气液比例波动大时,实现进入蒸发器前的气液两相制冷剂的分离,降低进入蒸发器的制冷剂干度,不仅改善制冷机组冷冻模式下制冷剂的分配不均问题,同时也提升蒸发器的换热效率和换热量,控制压缩机排气温度。目前,由于制冷剂气液两相流理论分析相对复杂,无法通过理论对比分析出各种分液头对制冷机组性能的影响,因此,运输用制冷机组分别采用文丘里分液头和气液分离型分液头,进行冷藏模式和冷冻模式下的试验测试。本研究提升了冷链装备在复杂环境下的适应能力与运行可靠性,为运输制冷机组高效稳定运行提供新的研究思路与实现路径。
为解决低蒸发温度时分液头分液不均的问题,设计了一款具有气液分离功能的分液头,结构如图1所示。
该分液头自下而上由3部分组成:最下部分的中间圆管为制冷剂进口,圆管四周的圆锥腔为液体收集腔,又是四周分液管的进液腔;中间部分为气液分离部分,其中外围的圆形孔道为分液管的通道,中间的多层微孔为气体通道,中心为圆形挡板,与下部的制冷剂进口管垂直;最上部分为制冷剂出口,其外围圆形孔道为分液管的通道,中心的圆形孔道为旁通气管通道。
该气液分离型分液头的工作原理如图2所示。其来自膨胀阀的低温、低压气液混合制冷剂,经制冷剂进口管与中间的圆形挡板撞击,在重力及气液惯性差异的共同作用下,将气态与液态制冷剂分离,其中液态制冷剂沉降至分液头最下部分的液体收集腔,经分液头四周的分液管进入蒸发器;而分离的气态制冷剂通过中间部分的多层微孔通道进入气体收集腔,然后经过最上部分的旁通气管进入蒸发器出口管。
根据两相制冷剂干度的定义,干度x为气液两相流中气相制冷剂质量占总质量的比值:
x=mvmv+ml
式中,x为制冷剂干度;mv为气相制冷剂质量,kg;ml为液相制冷剂质量,kg。若未设置气液分离装置,进入蒸发器入口的两相流初始干度为x0。
由于分离出的液态制冷剂经底部液体收集腔和周向分液管进入蒸发器,而分离出的气态制冷剂经微孔通道进入气体收集腔,再通过旁通气管直接进入蒸发器出口管。因此,进入蒸发器分配支路的制冷剂主要为液相或低干度两相流,而不再包含节流后产生的全部闪蒸气体。设分离效率为η(入口混合制冷剂中被旁通移除的气相质量分数占原气相质量的比例),则进入蒸发器入口段的制冷剂等效干度可表示如下:
xin'=1-ηmv1-ηmv+ml
由于0<η<1,显然有xin'<x0,因此,蒸发器入口制冷剂干度必然降低。
根据两相区制冷剂比焓的关系式:
h=hf+xhfg
式中,h为制冷剂两相区焓值,kJ/kg;hf为制冷剂饱和液体焓值,kJ/kg;hfg为制冷剂汽化潜热,kJ/kg。
由式(3)可知,因为xin'<x0,蒸发器入口制冷剂比焓hin小于未分离时的初始比焓h0。此时,蒸发器的制冷量如下:
Φ=1-ηmv+mlhout-hin
式中,Φ为蒸发器制冷量,kW;hout为蒸发器出口制冷剂比焓,kJ/kg;hin为蒸发器入口制冷剂比焓,kJ/kg。
由式(4)可知,虽然进入蒸发器的气相制冷剂质量流量略有降低,但旁通气相减少了闪发气体对流通截面的无效占据,使蒸发器前段更多承担液相制冷剂的沸腾换热,延长了蒸发器内两相沸腾换热区域,提高了蒸发器的有效换热面积利用率与整体传热系数,从而强化了蒸发器的潜热换热能力。
同时,被分离的气相制冷剂ηmv并未损失,而是通过旁通管路接入蒸发器出口管,混合后进入回热器,提高了膨胀阀前制冷剂的过冷度,进一步降低蒸发器入口制冷剂比焓,最终实现系统制冷量的显著提升。
为探究新型分液头在运输用制冷机组中的实际性能,文中对传统机组文丘里分液头进行了替换,改造后的系统测试原理如图3所示。
该系统主要由压缩机、油分离器、冷凝器、储液罐、回热器、电子膨胀阀、气液分离型分液头、蒸发器等部件组成。其循环过程如下:压缩机排出高温高压的气态制冷剂,先经油分离器进入冷凝器,在冷凝器内冷凝为中温高压的过冷液态制冷剂;随后,制冷剂流经储液罐进入回热器盘管,并与来自蒸发器出口管的气态制冷剂进行热交换,进一步转变为二次过冷液态制冷剂;之后,制冷剂经电子膨胀阀节流膨胀,成为低温低压的气液两相流,并进入气液分离型分液头;在分液头内,分离出的液态制冷剂通过分液管进入蒸发器,与室内侧空气换热后蒸发为气态制冷剂,而分离出的气态制冷剂则经旁通气管进入蒸发器出口管,与蒸发器流出的气态制冷剂混合后,一并进入回热器;在回热器中,气态制冷剂与盘管内的中温高压液态制冷剂进行热交换,自身被进一步过热,最终返回压缩机,从而完成整个循环。
本试验系统以R404A作为循环制冷剂,整套测试装置的主要设备技术参数如表1所示。装置改造完成后,室内侧管路连接形式如图4所示。本次优化设计的新型分液头增设旁通气路结构,气液分离出的气态制冷剂通过旁通气管进入旁通调节阀,经流量调控后汇入蒸发器出口管路,以此实现气流连通。
依据GB 29753—2023《道路运输 易腐食品与生物制品 冷藏车安全要求及试验方法》和GB/T 21145—2023《运输用制冷机组》,制定了基于气液分离型分液头的运输用制冷机组性能测试工况,如表2所示。其中,冷藏模式、冷冻模式时,电子膨胀阀过热度分别控制为10 ℃和5 ℃。所有测试工况均在标准焓差实验室中进行。
图5示出在冷藏工作模式时,采用2种不同分液头的机组制冷量对比结果。
机组开启后,由于室内侧蒸发器的结霜厚度随着时间的增加而增加,采用2种不同分液头的机组制冷量均呈现先上升后下降的趋势。其中,采用文丘里分液头的原机组最大制冷量和平均制冷量分别为4 508,3 041 W;而采用气液分离型分液头的制冷机组,随着旁通支路上旁通调节阀开度由0%,20%,40%增大时,机组的最大制冷量分别为5 070,5 519,5 168 W,平均制冷量分别为3 113,3 973,3 680 W。对比发现,新型分液头的制冷机组最大制冷量及平均制冷量均高于采用文丘里分液头的原机组,其中,最大制冷量分别提高了12.5%,22.4%,14.6%,而平均制冷量分别提高了2.4%,30.6%,21.0%,表明新型分液头在旁通调节阀关闭时仍能保持更优的分液均匀性,进而使蒸发器有效换热面积最大化,提高了蒸发器的换热效率。进一步分析发现,随着分液头旁通支路开度的增大,20%旁通开度下制冷性能最优,而40%旁通开度下制冷量开始下降。其根本原因:旁通调节阀开度开启过大导致部分液态制冷剂分流至旁通回路,进而引起进入蒸发器的液态制冷剂减少,蒸发器换热量下降。
图6示出在冷藏工作模式时,采用2种不同分液头的机组排气温度对比结果。机组开启大约10 min后,采用2种不同分液头的机组排气温度均保持相对稳定值。其中,采用文丘里分液头的原机组平均排气温度为81.5 ℃;而采用气液分离型分液头,随着旁通支路上旁通调节阀开度由0%,20%,40%增大时,机组的平均排气温度分别为81.3,87.3,70.6 ℃。对比发现,在旁通调节阀关闭时,采用新型分液头的机组排气温度基本等于采用文丘里分液头的原机组排气温度,但旁通调节阀开度20%时,排气温度上升约6 ℃,而旁通调节阀开度40%时,排气温度反而下降约11 ℃。导致上述现象的原因如下:当旁通调节阀开度较小时,旁通支路内仅流通饱和气态制冷剂,该气态制冷剂与蒸发器流出的气态制冷剂混合后,在回热器中产生显著温升,使得压缩机吸气过热度增大,进而引起排气温度升高;随着旁通调节阀开度增大,旁通支路开始输送气液两相制冷剂,与蒸发器出口气态制冷剂混合后,在回热器中的温升显著减小,有效降低了压缩机吸气过热度,从而使排气温度明显降低。
图7示出在冷冻工作模式时,采用2种不同分液头的机组制冷量对比结果。
机组开启后,由于室内侧含湿量较小、蒸发器的结霜速度较慢,因此,采用2种不同分液头的机组制冷量均呈现先上升后略有下降的趋势。其中,采用文丘里分液头的原机组平均制冷量为2 086 W,而采用气液分离型分液头的制冷机组,随着旁通支路上旁通调节阀开度由20%,40%增大时,机组的平均制冷量分别为2 892,2 419 W。对比发现,新型分液头的制冷机组平均制冷量均高于采用文丘里分液头的原机组,平均制冷量分别提高了38.6%,16.0%,其提升效果的趋势及机理与冷藏模式一样。
图8示出在冷冻工作模式时,采用2种不同分液头的机组排气温度对比。可以看出,机组开启大约10 min后,采用2种不同分液头的机组排气温度均保持相对稳定值。其中,采用文丘里分液头的原机组排气温度为87.8 ℃;而采用气液分离型分液头,随着旁通支路上旁通调节阀开度由20%,40%增大时,机组的排气温度分别为91.7,77.7 ℃。对比发现,在旁通调节阀开度20%时,排气温度上升约4 ℃,而旁通调节阀开度40%时,排气温度反而下降约10 ℃。其产生原因的机理与冷藏模式一样。
为解决低温工况下文丘里分液头制冷剂分配不均的问题,研发了新型气液分离式分液头,完成运输用制冷机组的改造,并在冷藏与冷冻2种工况下开展性能试验,得到主要结论如下。
(1)相较于采用文丘里分液头的原机组,采用新型分液头的机组制冷量显著提升。在20%旁通调节阀开度时,冷藏模式、冷冻模式下制冷量分别提高30.6%,38.6%。
(2)相较于采用文丘里分液头的原机组,采用新型分液头的机组随着旁通调节阀开度的增大,压缩机排气温度先上升后下降。在20%旁通调节阀开度时,冷藏模式下排气温度上升约6 ℃、冷冻模式下排气温度上升约4 ℃;在40%旁通调节阀开度时,冷藏模式下排气温度下降约11 ℃、冷冻模式下排气温度下降约10 ℃。

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doi: 10.3969/j.issn.1005-0329.2026.04.003
  • 接收时间:2025-08-05
  • 首发时间:2026-10-22
  • 出版时间:2026-04-30
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  • 收稿日期:2025-08-05
  • 修回日期:2026-03-17
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    中原工学院 智慧能源与环境学院,郑州 450007
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
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