WO2017080346A1 - 翅片式蒸发器 - Google Patents

翅片式蒸发器 Download PDF

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Publication number
WO2017080346A1
WO2017080346A1 PCT/CN2016/102533 CN2016102533W WO2017080346A1 WO 2017080346 A1 WO2017080346 A1 WO 2017080346A1 CN 2016102533 W CN2016102533 W CN 2016102533W WO 2017080346 A1 WO2017080346 A1 WO 2017080346A1
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Prior art keywords
liquid
evaporator
heat exchange
coil
tube
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PCT/CN2016/102533
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English (en)
French (fr)
Inventor
张建华
曹德云
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南通四方冷链装备股份有限公司
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Publication of WO2017080346A1 publication Critical patent/WO2017080346A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators

Definitions

  • the invention relates to a fin type evaporator, which is mainly used for a fluidized quick freezing device, a stacked spiral quick freezing device and the like.
  • the evaporator is one of the four major components of refrigeration.
  • the refrigerant liquid flows through the evaporator, it exchanges heat with the surrounding medium to absorb heat and vaporizes, and the surrounding medium releases heat to achieve the purpose of refrigeration.
  • the fin evaporator is divided into a full liquid evaporator and a dry evaporator.
  • the refrigerant liquid enters the evaporator through the throttling device, so that the liquid level in the evaporator is kept constant, and the heat transfer tube in the evaporator is immersed in the refrigerant liquid to ensure sufficient refrigerant and The product produces heat exchange.
  • auxiliary equipment such as a low-pressure circulation tank, a fluorine pump or a gas-liquid separator to increase the failure rate of the system, and the refrigerant charge is large and the investment is large.
  • the flooded evaporator also has the problem of difficulty in returning oil.
  • the up-and-down type dry evaporator (Fig. 2) directly controls the liquid refrigerant into the evaporator by a thermal expansion valve or an electronic expansion valve, and the refrigerant liquid is gradually converted into a gas in the evaporation tube.
  • the refrigerant liquid After the refrigerant liquid passes through the expansion valve, it becomes a low-temperature low-pressure refrigerant, and the refrigerant absorbs heat in the coil to evaporate and generate gas.
  • the refrigerant liquid content in the coil is 60% to 80%, and the content of the refrigerant liquid in the coil is About 20%, in the coil, all of the last unvaporized refrigerant liquid evaporates and generates superheated gas.
  • the refrigerant charge of the dry evaporator is about 1/2 to 1/3 of that of the flooded evaporator.
  • the evaporator heat exchange efficiency is lower than that of the full liquid evaporator.
  • the object of the present invention is to overcome the above deficiencies and to provide fin-type evaporation which improves heat exchange efficiency, uniform liquid supply, and improved reliability and safety.
  • a fin type evaporator comprising a liquid supply pipe, a heat expansion valve is arranged on the liquid supply pipe, a heat exchange pipe is connected to the liquid supply pipe, and the heat exchange pipe is composed of the first section
  • the evaporating coil, the second evaporating coil, the large elbow, the third evaporating coil and the return air port are composed, the first evaporating coil is filled with the refrigerant liquid, and the second evaporating coil is filled with the refrigerant filling liquid.
  • the amount is 15%-20%.
  • a further improvement of the invention consists in that the length of the first section of the evaporating coil is 2/3 of the length of the entire heat exchange tube.
  • a further improvement of the present invention is that the liquid supply mode of the evaporator adopts a down-and-down type.
  • the invention has the following characteristics:
  • the inner surface of the partially filled heat exchange tube is in a wet state, which improves the surface heat exchange efficiency of the evaporation tube.
  • the air return port is arranged on the suction side to ensure that the compressor inhales the superheated steam, which improves the reliability and safety of the compressor operation.
  • Figure 1 is a schematic view of the structure of the present invention
  • a fin type evaporator includes a liquid supply pipe 1 , and a heat expansion valve 2 is disposed on the liquid supply pipe 1 , and the heat supply pipe is connected to the liquid supply pipe 1 , and the heat exchange pipe is evaporated by the first stage.
  • the coil 3, the second-stage evaporation coil 4, the large curved tube 5, the third-stage evaporation coil 6 and the return air port 7 are composed, the first-stage evaporation coil 3 is filled with refrigerant liquid, and the second-stage evaporation coil 3
  • the amount of refrigerant charged in the refrigerant is 15%-20%.
  • the length of the first evaporating coil 3 accounts for 2/3 of the length of the entire heat exchange tube, that is, the internal liquid filling amount reaches 95% or more, which achieves the effect of the full liquid evaporator; the liquid supply mode of the evaporator adopts the downward flow. Down-flow type; the evaporator adopts a clever arrangement to make the evaporator have the effect of a full-liquid evaporator
  • the high-temperature high-pressure refrigerant liquid enters the heat exchange tube through the water supply pipe 1 through the thermal expansion valve 2, and then enters the first-stage evaporation coil 3, and the refrigerant liquid is filled in the first-stage evaporation coil 3.
  • the inner surface of the whole heat exchange tube is in a wet state, and the liquid filling amount in the second-stage evaporation coil 4 is about 15%-20%, and finally reaches the third-stage evaporation coil 6 through the large curved tube 5, in the third stage.
  • the remaining liquid refrigerant which has not evaporated is sufficiently heat-exchanged with the sucked in hot air to generate a certain overheating, and finally the superheated refrigerant gas is returned to the compressor through the return port 7.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

一种翅片式蒸发器，包括供液管(1)，供液管上设有热力膨胀阀(2)，供液管(1)连接有换热管，换热管由第一段蒸发盘管(3)、第二段蒸发盘管(4)、大弯管(5)、第三段蒸发盘管(6)及回气口(7)组成，第一段蒸发盘管(3)内充满制冷剂液体，第二段蒸发盘管(4)内充进的制冷剂充液量为15-20％左右。具有提高换热效率、供液均匀、提高可靠性和安全性的优点。

Description

翅片式蒸发器 技术领域
本发明涉及一种翅片式蒸发器，主要用于流态化速冻装置、堆积式螺旋速冻装置等。
背景技术
蒸发器是制冷四大件之一，利用制冷剂液体流过蒸发器时与周围介质产生热交换吸收热量而汽化，周围介质放出热量，达到制冷的目的。从供液方式上看，翅片蒸发器分为满液式蒸发器与干式蒸发器。满液式蒸发器中，制冷剂液体经过节流装置进人蒸发器，使蒸发器内的液位保持一定，蒸发器内的传热管浸没在制冷剂液体中，保证有足够的制冷剂与产品产生热交换。但是要把蒸发做成满液式供液的制冷系统，必须增加低压循环桶、氟泵或气液分离器等较多辅助设备提高了系统的故障率，并且制冷剂充注量大、投资大等缺点；特别是满液式蒸发器还存在回油困难的问题。上进下出式干式蒸发器(如图2)则由热力膨胀阀或电子膨胀阀直接控制液体制冷剂进人蒸发器，制冷剂液体在蒸发管内逐步转变为气体。制冷剂液体通过膨胀阀后变成低温低压的制冷剂，制冷剂在盘管中吸热蒸发产生气体，盘管中制冷剂液体含量60％～80％，而在盘管中制冷剂液体的含量约20％，在盘管中，将最后未蒸发的的制冷剂液体全部蒸发并产生过热气体。干式蒸发器的制冷剂的充注量约为满液式蒸发器的1/2～1/3。蒸发器换热效率比满液式蒸发器低。
发明内容
本发明的目的是为了克服以上的不足，提供一种提高换热效率、供液均匀、提高可靠性和安全性的翅片式蒸发。
本发明的目的通过以下技术方案来实现：一种翅片式蒸发器，包括供液管，供液管上设有热力膨胀阀，供液管连接有换热管，换热管由第一段蒸发盘管、第二段蒸发盘管、大弯管、第三段蒸发盘管和回气口组成，第一段蒸发盘管内充满制冷剂液体，第二段蒸发盘管内充进的制冷剂充液量为15％-20％。
本发明的进一步改进在于：第一段蒸发盘管的长度占整个换热管长度的2/3。
本发明的进一步改进在于：蒸发器的供液方式采用下进下出式。
本发明与现有技术相比具有以下特点：
(1)满液部分换热管内表面处于润湿状态，提高了蒸发管的表面换热效率。
(2)集满液式供液的优点于一体，而不存在满液式蒸发器回油困难的问题。
(3)尤其在使用一只的膨胀阀供液，再通过分液器分为多路蒸发管的供液显现出更为明显的优势，因为这种供液方式会充分保证了冷风机各路换热管供液均匀。
(4)回气口布置在吸风侧也充分保证了压缩机吸入的是过热蒸气，提高了压缩机运行的可靠性与安全性。
附图说明：
图1为本发明的结构示意图；
图2为现有技术的结构示意图；
图中标号：1-供液管、2-热力膨胀阀、3-第一段蒸发盘管、4-第二段蒸发盘管、5-大弯管、6-第三段蒸发盘管、7-回气口。
具体实施方式：
为使本发明实施例的目的、技术方案和优点更加清楚，下面将对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。在本发明的一种实施方式中描述的元素和特征可以与一个或更多个其它实施方式中示出的元素和特征相结合。应当注意，为了清楚的目的，说明中省略了与本发明无关的、本领域普通技术人员已知的部件和处理的表示和描述。基于本发明中的实施例，本领域普通技术人员在没有付出创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
如图1所示，一种翅片式蒸发器，包括供液管1，供液管1上设有热力膨胀阀2，供液管1连接有换热管，换热管由第一段蒸发盘管3、第二段蒸发盘管4、大弯管5、第三段蒸发盘管6和回气口7组成，第一段蒸发盘管3内充满制冷剂液体，第二段蒸发盘管3内充进的制冷剂充液量为15％-20％。第一段蒸发盘管3的长度占整个换热管长度的2/3，即其内部充液量达到95％以上，达到了满液蒸发器的效果；该蒸发器的供液方式采用下进下出式；该蒸发器采用一种巧妙的排布方式，使蒸发器具有满液式蒸发器的效果
高温高压制冷剂液体通过供液管1经热力膨胀阀2节流降压后进入换热管，首先进入第一段蒸发盘管3，制冷剂液体在第一段蒸发盘管3内为充满状态，整个换热管内表面为润湿状态，在第二段蒸发盘管4内充液量约为15％-20％，最后经过大弯管5到达第三段蒸发盘管6，在第三段蒸发盘管6内，剩余没有蒸发的液态制冷剂与吸进去的热空气充分热交换并产生一定的过热，最后过热制冷剂气体通过回气口7回到压缩机。
最后应说明的是：虽然以上已经详细说明了本发明及其优点，但是应当理解在不超出由所附的权利要求所限定的本发明的精神和范围的情况下可以进行各种改变、替代和变换。而且，本发明的范围不仅限于说明书所描述的过程、设备、手段、方法和步骤的具体实施例。本领域内的普通技术人员从本发明的公开内容将容易理解，根据本发明可以使用执行与在此所述的相应实施例基本相同的功能或者获得与其基本相同的结果的、现有和将来要被开发的过程、设备、手段、方法或者步骤。因此，所附的权利要求旨在在它们的范围内包括这样的过程、设备、手段、方法或者步骤。

Claims (3)

  1. 一种翅片式蒸发器，包括供液管(1)，其特征在于：所述供液管(1)上设有热力膨胀阀(2)，所述供液管(1)连接有换热管，所述换热管由第一段蒸发盘管(3)、第二段蒸发盘管(4)、大弯管(5)、第三段蒸发盘管(6)和回气管(7)组成，所述第一段蒸发盘管(3)内充满制冷剂液体，所述第二段蒸发盘管(4)内充进的制冷剂充液量为15％-20％。
  2. 根据权利要求1所述一种翅片式蒸发器，其特征在于：所述第一段蒸发盘管(3)的长度占整个换热管长度的2/3。
  3. 根据权利要求1或2所述一种翅片式蒸发器，其特征在于：蒸发器的供液方式采用下进下出式。
PCT/CN2016/102533 2015-11-10 2016-10-19 翅片式蒸发器 WO2017080346A1 (zh)

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CN109682119A (zh) * 2019-01-28 2019-04-26 天津商业大学 一种带高效分液功能的蒸发盘管
CN111442550A (zh) * 2020-05-15 2020-07-24 北京百度网讯科技有限公司 制冷系统

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CN105258404A (zh) * 2015-11-10 2016-01-20 南通四方冷链装备股份有限公司 翅片式蒸发器

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JP2007078228A (ja) * 2005-09-13 2007-03-29 Fuji Electric Retail Systems Co Ltd 冷気循環式ショーケース
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CN109682119B (zh) * 2019-01-28 2024-03-29 天津商业大学 一种带高效分液功能的蒸发盘管
CN111442550A (zh) * 2020-05-15 2020-07-24 北京百度网讯科技有限公司 制冷系统

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