EP4105576B1 - Economiser für ein kältesystem und kältesystem - Google Patents

Economiser für ein kältesystem und kältesystem Download PDF

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Publication number
EP4105576B1
EP4105576B1 EP22179463.9A EP22179463A EP4105576B1 EP 4105576 B1 EP4105576 B1 EP 4105576B1 EP 22179463 A EP22179463 A EP 22179463A EP 4105576 B1 EP4105576 B1 EP 4105576B1
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EP
European Patent Office
Prior art keywords
refrigeration system
economizer
pipe
liquid
lead
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EP22179463.9A
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English (en)
French (fr)
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EP4105576A1 (de
Inventor
Weijie SHAO
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Carrier Corp
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Carrier Corp
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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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • 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
    • F25B31/00—Compressor arrangements
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/02—Centrifugal separation of gas, liquid or oil
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/23—Separators

Definitions

  • the present invention relates to the technical field of heat exchange equipment, in particular to an economizer for a refrigeration system, and also relates to a refrigeration system provided with the economizer.
  • economizer is an energy-saving device widely used in heat pump chillers in the refrigeration and air conditioning industry, which mainly functions to realize gas-liquid separation and improve unit operating efficiency.
  • the gas-liquid two-phase refrigerant enters the tank of the economizer through a lead-in pipe.
  • the gaseous portion of the refrigerant is completely separated from the liquid portion by the structure arranged in the tank of the economizer.
  • the separated gaseous refrigerant enters the compressor through the gas outlet pipe to form a secondary suction, and the separated liquid refrigerant flows out through the liquid outlet pipe and enters the evaporator for evaporative refrigeration.
  • the liquid refrigerant continuously gathers at the bottom of the tank, and then flows out from the liquid outlet pipe.
  • the inner wall of the existing lead-in pipe is smooth, and the gas-liquid two-phase refrigerant enters the lead-in pipe without being seperated, so that the droplets of different particle sizes will directly enter the tank of the economizer along with the refrigerant gas flow.
  • the compressor is a mechanical device that converts gas or vapor into liquid, so the consequence of a high liquid content in the gaseous refrigerant entering the compressor will be an increase in the power consumption of the compressor or liquid hammer.
  • the prior art EP3502589 discloses an economiser comprising a tank extending in a horizontal direction, a lead-in pipe arranged at one end of the tank for introducing gas-liquid two-phase refrigerant, a gas outlet portion arranged at the other end of the tank for directing gaseous refrigerant and a liquid outlet portion arranged below the gas outlet portion for directing liquid refrigerant.
  • the refrigeration system comprises a refrigerant circuit formed by sequentially connecting a compressor, a condenser, an expansion mechanism and an evaporator, wherein the economizer comprises: a tank extending in a horizontal direction; a lead-in pipe arranged at one end of the tank for introducing the gas-liquid two-phase refrigerant from the condenser; a gas outlet portion arranged at the other end of the tank for directing the gaseous refrigerant back to the compressor; and a liquid outlet portion arranged below the gas outlet portion for directing the liquid refrigerant to the evaporator; wherein a threaded portion is provided on the inner wall of the lead-in pipe for performing gas-liquid separation for the gas-liquid two-phase refriger
  • the threaded portion of the lead-in pipe is arranged near the junction of the lead-in pipe and the tank.
  • the length of the threaded portion of the lead-in pipe is in a range of 20-30mm.
  • the height of the threaded portion of the lead-in pipe is in a range of 0.1-0.2 mm.
  • the helix angle of the threaded portion of the lead-in pipe is in a range of 30°-60°.
  • the lead-in pipe is a 90° elbow pipe.
  • the threaded portion of the lead-in pipe is a continuous threaded structure.
  • a plurality of orifice plates arranged side by side for performing gas-liquid seperation for the gas-liquid two-phase refrigerant are provided near the lead-in pipe inside the tank.
  • a liquid baffle is provided between the orifice plates and the liquid outlet portion inside the tank.
  • the gas outlet portion is arranged at the top of the tank, and the liquid outlet portion is arranged at the bottom of the tank.
  • a refrigeration system comprising the economizer according to the first aspect of the invention.
  • the refrigeration system comprises the refrigeration circuit recited herein with reference to the first aspect of the invention.
  • the refrigeration circuit is formed by sequentially connecting the compressor, the condenser, the expansion mechanism and the evaporator.
  • the refrigeration system is a multi-stage compression refrigeration system, and the compressor is a multi-stage compressor, wherein the gas outlet portion of the economizer is connected to the intermediate suction port of the multi-stage compressor.
  • the economizer for a refrigeration system by arranging a threaded portion on the inner wall of the lead-in pipe, enables the gas-liquid two-phase refrigerant to better realize gas-liquid separation when entering the economizer tank by means of centrifugal action.
  • orientation terms such as upper, lower, left, right, front, rear, inner side, outer side, top and bottom mentioned or possibly mentioned in this specification are defined relative to the configurations illustrated in the respective drawings. They are relative concepts, so they may change accordingly according to their different locations and different states of use. Therefore, these and other orientation terms shall not be construed as restrictive terms.
  • FIG. 1 it schematically illustrates the structure of an embodiment of the economizer for a refrigeration system according to the present invention in general.
  • the refrigeration system comprises a refrigerant circuit formed by sequentially connecting a compressor, a condenser, an expansion mechanism and an evaporator.
  • the economizer 100 may be composed of a tank 110, a lead-in pipe 120, a gas outlet portion 130, a liquid outlet portion 140 and other components.
  • the tank 110 is cylindrical and extends in a horizontal direction.
  • the lead-in pipe 120 is arranged at one end of the tank 110 to introduce the gas-liquid two-phase refrigerant from the condenser, wherein the flow direction of the gas-liquid two-phase refrigerant is indicated by arrow a. It can be seen from FIG. 1 in conjunction with FIG. 2 that a threaded portion 121 is further provided on the inner wall of the lead-in pipe 120, so as to perform gas-liquid separation for the gas-liquid two-phase refrigerant by means of centrifugal action.
  • the threaded portion 121 can greatly increase the flow resistance of the gas-liquid two-phase refrigerant.
  • the advancement of the liquid and gas in the gas-liquid two-phase refrigerant will be hindered due to the increase of resistance.
  • the gas in the gas-liquid two-phase refrigerant will become droplets and the droplets settle. Therefore, preliminary gas-liquid separation can be achieved by means of the threaded structure of the lead-in pipe 120.
  • the threaded structure of the lead-in pipe 120 will help to generate centrifugal action, so that the gas-liquid two-phase refrigerant can rotate around the helical pipe wall to throw out the refrigerant droplets directly to the wall surface of the tank 110.
  • the threaded portion 121 may be provided near the junction of the lead-in pipe 120 and the tank 110 (as shown in the circled portion in FIG 1 ), so as to perform effective gas-liquid separation for the gas-liquid two-phase refrigerant entering the tank 110.
  • the length of the threaded portion 121 of the lead-in pipe 120 may be designed in a range of 20-30mm.
  • the height of the threaded portion 121 of the lead-in pipe 120 may be designed in a range of 0.1-0.2mm.
  • the helix angle of the threaded portion 121 of the lead-in pipe 120 may be designed in a range of 30°-60°.
  • the threaded portion 121 of the lead-in pipe 120 may be configured as a continuous threaded structure, as shown in FIG. 2 .
  • the threaded portion 121 can also be designed into an irregular shape, such as a discontinuous or asymmetric threaded structure.
  • the gas outlet portion 130 may be arranged at the other end of the tank 110, so as to direct the gaseous refrigerant separated from the gas-liquid two-phase refrigerant back to the compressor, wherein the flow direction of the gaseous refrigerant is indicated by arrow b.
  • the liquid outlet portion 140 may be arranged somewhere under the gas outlet portion 130, so as to direct the liquid refrigerant separated from the gas-liquid two-phase refrigerant to the evaporator, wherein the flow direction of the liquid refrigerant is indicated by arrow c.
  • the tank 110 of the economizer 100 in the tank 110 of the economizer 100, three orifice plates 150 arranged side by side are provided near the lead-in pipe 120, and a number of orifices are provided on the orifice plates 150, so as to facilitate further gas-liquid separation of the gas-liquid two-phase refrigerant passing through it.
  • the number of orifice plates 150 is not limited to three, and can be two, four, five or others within the allowable range of compressor power, as long as it is ensured that effective gas-liquid separation can be performed for the gas-liquid two-phase refrigerant.
  • the position of the orifice plates 150, and the size and shape of the orifices can be adjusted according to actual needs.
  • a liquid baffle 160 may also be arranged between the orifice plates 150 and the liquid outlet portion 140, wherein the liquid baffle 160 may be arranged at the top of the tank 100, i.e., extending downward from the top wall of the tank 100 as shown in FIG. 1 .
  • the gas-liquid two-phase refrigerant passes through the orifice plates 150 and is blocked by the liquid baffle 160, so that most of the liquid refrigerant can settle in the lower part of the tank 110 and flows along the bottom wall of the tank 110 into the evaporator through the liquid outlet portion 140, while the gaseous refrigerant flows along the length direction of the tank 110 into the compressor through the gas outlet portion 130 of the tank 110.
  • the gas outlet portion 130 may be arranged at the top of the tank 110, and the liquid outlet portion 140 may be arranged at the bottom of the tank 110, as shown in FIG. 1 .
  • the economizer for a refrigeration system adopts a threaded structure on the inner wall of the lead-in pipe, so that the droplets in the gas-liquid two-phase refrigerant can settle by means of centrifugal action, thereby improving the gas-liquid separation efficiency of the gas-liquid two-phase refrigerant and then effectively reducing the liquid content of the gas in the gas outlet portion.
  • the present invention further provides a refrigeration system provided with the aforementioned economizer.
  • the refrigeration system comprises a cooling tower, a water chiller, a pumping device, and the like that are connected by pipelines, wherein the water chiller is composed of components such as compressor, condenser, throttling device and evaporator.
  • the refrigeration system may be a multi-stage compression refrigeration system, and the compressor is a multi-stage compressor.
  • the gas outlet portion of the economizer is connected to the intermediate suction port of the multi-stage compressor.
  • the separated gas enters the intermediate suction port of the multi-stage compressor through the gas outlet portion, and is mixed with the intermediate pressure refrigerant gas which is formed after being sucked from the evaporator and compressed in the low-pressure stage, to enter the high-pressure stage for recompression.
  • the refrigeration system provided with the aforementioned economizer can significantly improve the cooling capacity and operating efficiency without additional cost, so it is highly recommended to apply the aforementioned economizer to various refrigeration systems.
  • the lead-in pipe can be designed as a 90° elbow pipe.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Air-Conditioning For Vehicles (AREA)

Claims (11)

  1. Economiser für ein Kältesystem, wobei das Kältesystem einen Kältemittelkreislauf umfasst, der durch sequenzielles Verbinden eines Kompressors, eines Kondensators, eines Expansionsmechanismus und eines Verdampfers gebildet ist, wobei der Economiser Folgendes umfasst:
    einen Tank (110), der sich in einer horizontalen Richtung erstreckt;
    ein Zuführungsrohr (120), das an einem Ende des Tanks angeordnet ist, um ein zweiphasiges Gas-Flüssigkeit-Kältemittel aus dem Kondensator einzuführen;
    einen Gasauslassabschnitt (130), der an dem anderen Ende des Tanks (110) angeordnet ist, um gasförmiges Kältemittel zurück zu dem Kompressor zu leiten; und
    einen Flüssigkeitsauslassabschnitt (140), der unterhalb des Gasauslassabschnitts (130) angeordnet ist, um flüssiges Kältemittel zu dem Verdampfer zu leiten,
    dadurch gekennzeichnet, dass
    ein Gewindeabschnitt (121) an einer Innenwand des Zuführungsrohrs (120) bereitgestellt ist, um eine Gas-Flüssigkeit-Trennung für das zweiphasige Gas-Flüssigkeit-Kältemittel durch Zentrifugalwirkung durchzuführen.
  2. Economiser für ein Kältesystem nach Anspruch 1, wobei der Gewindeabschnitt (121) des Zuführungsrohrs (120) in der Nähe einer Verbindung des Zuführungsrohrs (120) und des Tanks (110) angeordnet ist.
  3. Economiser für ein Kältesystem nach Anspruch 1 oder 2, wobei eine Länge des Gewindeabschnitts (121) des Zuführungsrohrs (120) in einem Bereich von 20-30 mm liegt.
  4. Economiser für ein Kältesystem nach einem der Ansprüche 1 bis 3, wobei eine Höhe des Gewindeabschnitts (121) des Zuführungsrohrs (120) in einem Bereich von 0,1-0,2 mm liegt.
  5. Economiser für ein Kältesystem nach einem der vorhergehenden Ansprüche, wobei ein Steigungswinkel des Gewindeabschnitts (121) des Zuführungsrohrs (120) in einem Bereich von 30°-60° liegt.
  6. Economiser für ein Kältesystem nach einem der vorhergehenden Ansprüche, wobei die das Zuführungsrohr (120) ein 90°-Knierohr ist.
  7. Economiser für ein Kältesystem nach einem der vorhergehenden Ansprüche, wobei der Gewindeabschnitt (121) des Zuführungsrohrs (120) eine durchgehende Gewindestruktur ist.
  8. Economiser für ein Kältesystem nach einem der vorhergehenden Ansprüche, wobei eine Vielzahl von Drosselscheiben (150), die nebeneinander angeordnet sind, um eine Gas-Flüssigkeit-Trennung für das zweiphasige Gas-Flüssigkeit-Kältemittel durchzuführen, in der Nähe des Zuführungsrohrs (120) innerhalb des Tanks (110) bereitgestellt ist.
  9. Economiser für ein Kältesystem nach Anspruch 8, wobei ein Flüssigkeitsleitblech (160) zwischen den Drosselscheiben (150) und dem Flüssigkeitsauslassabschnitt (140) innerhalb des Tanks (110) bereitgestellt ist.
  10. Economiser für ein Kältesystem nach einem der vorhergehenden Ansprüche, wobei der Gasauslassabschnitt (130) an der Oberseite des Tanks (110) angeordnet ist und der Flüssigkeitsauslassabschnitt (140) an der Unterseite des Tanks (110) angeordnet ist.
  11. Kältesystem, das den Economiser (100) für ein Kältesystem nach einem der vorhergehenden Ansprüche umfasst, wobei das Kältesystem ein mehrstufiges Kompressionskältesystem ist, der Kompressor ein mehrstufiger Kompressor ist und ein Gasauslassabschnitt (130) des Economisers (100) mit einem Zwischensauganschluss des mehrstufigen Kompressors verbunden ist.
EP22179463.9A 2021-06-17 2022-06-16 Economiser für ein kältesystem und kältesystem Active EP4105576B1 (de)

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Application Number Priority Date Filing Date Title
CN202110672474.0A CN115493317A (zh) 2021-06-17 2021-06-17 用于制冷系统的经济器以及制冷系统

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EP4105576A1 EP4105576A1 (de) 2022-12-21
EP4105576B1 true EP4105576B1 (de) 2024-04-24

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115218559A (zh) * 2021-04-20 2022-10-21 开利公司 经济器及空气调节系统

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05223359A (ja) * 1991-12-06 1993-08-31 Nippondenso Co Ltd 冷凍サイクル
US9890977B2 (en) * 2013-10-03 2018-02-13 Carrier Corporation Flash tank economizer for two stage centrifugal water chillers
CN205957565U (zh) * 2016-08-22 2017-02-15 广东美的暖通设备有限公司 空调器的卧式气液分离器及空调器

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CN115493317A (zh) 2022-12-20

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