EP0374964B1 - Kältemittelrückgewinnungsverfahren - Google Patents

Kältemittelrückgewinnungsverfahren Download PDF

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Publication number
EP0374964B1
EP0374964B1 EP19890123832 EP89123832A EP0374964B1 EP 0374964 B1 EP0374964 B1 EP 0374964B1 EP 19890123832 EP19890123832 EP 19890123832 EP 89123832 A EP89123832 A EP 89123832A EP 0374964 B1 EP0374964 B1 EP 0374964B1
Authority
EP
European Patent Office
Prior art keywords
refrigerant
vessel
original
liquefication
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19890123832
Other languages
English (en)
French (fr)
Other versions
EP0374964A2 (de
EP0374964A3 (en
Inventor
Keiichi Tomaru
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanden Corp
Original Assignee
Sanden Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanden Corp filed Critical Sanden Corp
Publication of EP0374964A2 publication Critical patent/EP0374964A2/de
Publication of EP0374964A3 publication Critical patent/EP0374964A3/en
Application granted granted Critical
Publication of EP0374964B1 publication Critical patent/EP0374964B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • 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
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/002—Collecting refrigerant from a cycle

Definitions

  • This invention relates to a refrigerant recovering method .
  • a refrigerant such as a fluorocarbon refrigerant, is commonly employed in an air conditioner of an automobile or a refrigerator.
  • a refrigeration system will operate most efficiently when the refrigerant, which has become impure by pollutants in use, is made pure and relatively free of pollutants, for example, oil, air and water.
  • US-A-4,768,347 discloses such method in which a pressure switch controlling a solenid valve is arranged between the refrigeration circuit and a suction conduit.
  • Such a refrigerant recovering system comprises a liquefying unit which sucks the original refrigerant from an external freezing circuit or refrigeration circuit which is employed in, for example, an air conditioning system.
  • the inner temperature of the external freezing circuit will gradually decrease by evaporation of the original refrigerant in the external circuit.
  • the inner pressure of the external freezing circuit becomes negative pressure in comparison with atmospheric pressure. This negative pressure causes the external freezing circuit to be invaded by atmosphere, therein.
  • a refrigerant recovering method for use in recovering an original refrigerant from a refrigeration circuit as indicated in the claim.
  • Fig. 1 is a block diagram of a refrigerant recovering method according to an embodiment of this invention.
  • a refrigerant recovering unit is connected to an air conditioning system of an automobile.
  • the air conditioning system uses a fluorocarbon refrigerant as an original refrigerant in a freezing circuit (not shown).
  • the refrigerant recovering unit comprises an inlet electromagnetic valve 10 on a conducting pipe 12 which is coupled to the external freezing circuit.
  • the original refrigerant flows as a liquid phase flow and gaseous flow through the conducting pipe 12.
  • a pressure sensor 11 For controlling inner pressure of the external freezing circuit, a pressure sensor 11 is connected to the external freezing circuit. The pressure sensor 11 is for judging whether or not the inner pressure is negative in comparison with atmospheric presure to produce an internal signal when the inner pressure is negative. The internal signal is sent to the electromagnetic valve 10 through a wire 11a. Responsive to the internal signal, the electromagnetic valve 10 is automatically driven to inhibit passage of the original refrigerant in the conducting pipe 12.
  • the inlet electromagnetic valve 10 When the inlet electromagnetic valve 10 is opened for introducing the original refrigerant from the freezing circuit, the original refrigerant is sucked to a first filter dryer 13 by virtue of a compressor 18 which will later be described.
  • the inlet electromagnetic valve 11 can be disconnected from the freezing circuit.
  • the first filter dryer 13 is for removing an impurity, moisture, and acid content from the original refrigerant in the manner known in the art.
  • An accumulator 14 is connected to the first filter dryer 13 for accumulating the original refrigerant.
  • the liquid phase flow is accumulated in a bottom part of the accumulator 14, and the gaseous phase flow thereon is supplied to a first oil intercepter 15.
  • the first oil intercepter 15 is to intercept an oil element of the original refrigerant.
  • the intercepted oil element is accumulated in an oil tank 17 through an oil valve 16.
  • the original refrigerant is supplied to the compressor 18 from the first oil intercepter 15. In this event, the original refrigerant is of gaseous phase.
  • the gaseous original refrigerant is compressed in the compressor 18 and is supplied as a compressed refrigerant to a condenser 20 through a second oil intercepter 19.
  • the intercepted oil element is accumulated in another oil tank (not shown).
  • the condenser 20 the compressed refrigerant is cooled to thereby be condensed as a condensed refrigerant.
  • the condensed refrigerant is supplied to a second filter dryer 21 which is for removing an impurity, moisture, and acid content from the condensed refrigerant.
  • the condensed refrigerant is supplied to a separation vessel 22 and is separated into a gaseous phase refrigerant component and a liquid phase refrigerant component in the separation vessel 22.
  • the separation vessel 22 comprises an upper part and a bottom part defining an upper space and a bottom space, respectively.
  • the upper space and the bottom space is contiguous each other to form a hollow space in the separation vessel 22.
  • the gaseous phase refrigerant component has superior purity in comparison with the liquid phase refrigerant component.
  • a combination of the compressor 18, the second oil intercepter 19, the condenser 20, the second filter dryer 21 and, the separation vessel 22 is referred to as a separating arrangement.
  • a pipe 12 is for connecting between the inlet electromagnetic valve 11 and the separation vessel 22.
  • the separation vessel 22 has a first outlet port 22a at an upper portion thereof and a second outlet port 22b at a bottom portion thereof.
  • the first outlet port 22a is connected to a liquefication vessel 24a through a first supplying pipe 12a to communicate with a thermal space which is defined by the liquefication vessel 24a. Therefore, the gaseous phase refrigerant component is sent as an object refrigerant from the separation vessel 22 to the liquefication vessel 24b.
  • the second outlet port 22b is connected to an evaporator 24b through an automatic expansion valve 23 and a second supplying pipe 12b.
  • the liquid phase refrigerant component is sent as a liquid refrigerant from the separation vessel 22 to the evaporator 24b and is evaporated in the evaporator 24b to carry out cooling of a surrounding area of the evaporator 24b in the manner known in the art.
  • the evaporator 24b is thermally coupled to the thermal space of the liquefication vessel 24a.
  • the evaporator 24b is contained in the liquefication vessel 24a.
  • the gaseous phase refrigerant component is cooled in the liquefication vessel 24a by evaporation of the liquid refrigerant, namely, the liquid phase refrigerant component in the evaporator 24b.
  • heat exchange is carried out between the gaseous and the liquid phase refrigerant components. Therefore, the evaporator 24b may be referred to as a liquefying arrangement.
  • the liquid refrigerant After being evaporated in the evaporator 24b, the liquid refrigerant is returned to the compressor 18 through a returning pipe 12c.
  • a temperature detecting unit 25 is thermally coupled to the returning pipe 12c.
  • the temperature detecting unit 25 is for detecting temperature of the liquid refrigerant at vicinity of the liquefication vessel 24a to produce a temperature signal which is representative of the temperature signal which is representative of the temperature. Responsive to the temperature signal, the automatic expansion valve 23 is automatically driven to adjust flow amount of the liquid phase refrigerant component.
  • the liquefied object refrigerant is collected at a lower portion of the thermal space of the liquefication vessel 24a.
  • a storage container 26 is placed under the liquefication vessel 24a and is connected to the thermal space through a sending pipe 27. Therefore, the liquefied object refrigerant drips from the liquefication vessel 24a towards the storage container 26 through the sending pipe 27 by gravitational force thereof. As a result, the liquefied object refrigerant is charged in the storage container 26. It is a matter of course that the modified refrigerant has a relatively higher purity in the storage container 26.
  • the liquefied object refrigerant is prevented from charging thereof towards the storage container 26.
  • a liquid level sensor 28 is connected to the liquefication vessel 24a.
  • the liquid level sensor 28 is for detecting a predetermined liquid level to produce a condition signal.
  • the condition signal is sent to an electromagnetic valve 29.
  • the electromagnetic valve 29 is coupled to the sending pipe 27. Responsive to the condition signal, the electromagnetic valve 29 is automatically driven to adjust the movement of the liquefied object refrigerant through the sending pipe 27.
  • a combination of the sending pipe 27, the liquid level sensor 28, and the electromagnetic valve 29 is referred to as a control arrangement.
  • condition signal responsive to the predetermined liquid level is produced until the evaporator 24b is made thoroughly wet by the liquefied object refrigerant in the liquefication vessel 24b because of an effectiveness of the heat exchange.
  • the electromagnetic valve 29 is driven in response to the condition signal to stop the dripping of the liquefied object refrigerant to the storage container 26.
  • the electromagnetic valve 29 When the detected liquid level is higher than the predetermined level, the electromagnetic valve 29 is driven in response to the condition signal to open the sending pipe 27. So that, the liquefied object refrigerant flows into the storage container 26.
  • a breathing pipe 30 is disposed between the liquefication vessel 24a and the storage container 26 for breathing a residual gas of the refrigerant in the storage container 26 because of smooth flow of the liquefied object refrigerant. Therefore, the effectiveness of the heat exchange is increased in the liquefying arrangement.
  • the object refrigerant can be smoothly charged into the storage container 26 by a repeat of operation which is described before.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Claims (1)

  1. Verfahren zur Wiedergewinnung von Kältemittel aus einem unter Druck stehenden Kältekreislauf, wobei wiederholt die folgenden Schritte durchgeführt werden:
    a) Messen des Drucks im Kältekreislauf;
    b) Absaugen des Kältemittels aus dem Kältekreislauf, bis der Druck im Kältekreislauf unter den Atmosphärendruck sinkt;
    c) Stoppen des Ansaugens durch Schließen eines Ventils in der Saugleitung, wenn im Kältekreislauf Atmosphärendruck erreicht wurde, um so ein Eindringen von Luft in den Kältekreislauf zu verhindern.
EP19890123832 1988-12-22 1989-12-22 Kältemittelrückgewinnungsverfahren Expired - Lifetime EP0374964B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP322162/88 1988-12-22
JP32216288A JPH02169973A (ja) 1988-12-22 1988-12-22 フロン回収装置

Publications (3)

Publication Number Publication Date
EP0374964A2 EP0374964A2 (de) 1990-06-27
EP0374964A3 EP0374964A3 (en) 1990-10-24
EP0374964B1 true EP0374964B1 (de) 1993-02-03

Family

ID=18140629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890123832 Expired - Lifetime EP0374964B1 (de) 1988-12-22 1989-12-22 Kältemittelrückgewinnungsverfahren

Country Status (4)

Country Link
EP (1) EP0374964B1 (de)
JP (1) JPH02169973A (de)
AU (1) AU634737B2 (de)
DE (1) DE68904751T2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU671988B2 (en) * 1992-05-14 1996-09-19 Angelo Talarico Gas processor
DE10015976B4 (de) * 2000-03-30 2019-07-04 Mahle International Gmbh Befüllvorrichtung für Kraftfahrzeugklimaanlagen
JP6055647B2 (ja) * 2012-10-26 2016-12-27 エムケー精工株式会社 冷媒処理装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364236A (en) * 1980-12-01 1982-12-21 Robinair Manufacturing Corporation Refrigerant recovery and recharging system
DE3616591A1 (de) * 1986-05-16 1987-11-19 Weiss Umwelttechnik Gmbh Verfahren und vorrichtung zur ueberfuehrung von kaeltemittel aus einem kaeltekreislauf in einen kaeltemittelspeicher
JPS63129273A (ja) * 1986-11-18 1988-06-01 株式会社デンソー 冷媒回収装置
US4768347A (en) * 1987-11-04 1988-09-06 Kent-Moore Corporation Refrigerant recovery and purification system

Also Published As

Publication number Publication date
AU4726689A (en) 1990-06-28
EP0374964A2 (de) 1990-06-27
AU634737B2 (en) 1993-03-04
DE68904751D1 (de) 1993-03-18
EP0374964A3 (en) 1990-10-24
JPH02169973A (ja) 1990-06-29
DE68904751T2 (de) 1993-06-09

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