JP7029025B1 - Refrigerant recovery system and refrigerant recovery method - Google Patents

Refrigerant recovery system and refrigerant recovery method Download PDF

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JP7029025B1
JP7029025B1 JP2021514644A JP2021514644A JP7029025B1 JP 7029025 B1 JP7029025 B1 JP 7029025B1 JP 2021514644 A JP2021514644 A JP 2021514644A JP 2021514644 A JP2021514644 A JP 2021514644A JP 7029025 B1 JP7029025 B1 JP 7029025B1
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refrigerant
pressure
way valve
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recovery
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JPWO2022064671A1 (en
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正樹 近藤
勝也 谷口
亜加音 野村
幸治 太田
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Mitsubishi Electric Corp
Mitsubishi Electric Building Techno-Service Co Ltd
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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
    • 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
    • F25B2345/001—Charging refrigerant to a cycle
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

冷凍空調機器（１２）の冷媒回路（３０）から空調用冷媒を回収する冷媒回収システム（１０）である。冷媒回収システム（１０）は、冷媒回路（３０）にある空調用冷媒に圧縮凝縮を行って圧縮凝縮冷媒を生成する冷媒回収装置（１４）と、冷媒回収装置（１４）が生成した圧縮凝縮冷媒を回収する回収ボンベ（１６）と、圧縮凝縮冷媒を回収した回収ボンベ（１６）の内部から空調用冷媒を分離させるガス分離モジュール（６８）と、ガス分離モジュール（６８）が分離した空調用冷媒を冷媒回収装置（１４）に再送させる再送配管（５８）と、を備える。It is a refrigerant recovery system (10) that recovers the air-conditioning refrigerant from the refrigerant circuit (30) of the refrigerating and air-conditioning equipment (12). The refrigerant recovery system (10) includes a refrigerant recovery device (14) that compresses and condenses the air-conditioning refrigerant in the refrigerant circuit (30) to generate a compressed and condensed refrigerant, and a compressed and condensed refrigerant generated by the refrigerant recovery device (14). A gas separation module (68) that separates the air conditioning refrigerant from the inside of the recovery cylinder (16) that recovers the compressed condensed refrigerant, and the air conditioning refrigerant separated by the gas separation module (68). Is provided with a retransmission pipe (58) for retransmitting the refrigerant to the refrigerant recovery device (14).

Description

本発明は、冷媒回収システム及び冷媒回収方法に関するものである。 The present invention relates to a refrigerant recovery system and a refrigerant recovery method.

冷凍機やエアコンなどの冷凍空調機器（冷媒使用機器）においては、熱エネルギーを運搬する冷媒の循環経路上に、当該冷媒が気化したガス冷媒を圧縮して高温高圧化する空調用圧縮機と、空調用圧縮機で高温高圧化したガス冷媒を外気等で冷却して液化する空調用凝縮器と、空調用凝縮器で液化した冷媒(液冷媒)を膨張させて気体化する膨張弁と、膨張弁で気化した冷媒(ガス冷媒)を液体化する冷媒回収用凝縮器と、冷媒回収用凝縮器で液化した冷媒(液冷媒)を貯蔵するアキュムレータとが備えられている。冷媒は熱エネルギーを運搬する役割を担っており、空調用凝縮器において外部に熱を放出する一方、膨張弁を通過後に外気等から熱を受け取る。 In refrigerating and air-conditioning equipment (equipment using refrigerant) such as refrigerators and air conditioners, an air-conditioning compressor that compresses the gas refrigerant vaporized by the refrigerant to a high temperature and high pressure on the circulation path of the refrigerant that carries heat energy. An air-conditioning condenser that cools the high-temperature and high-pressure gas refrigerant with an air-conditioning compressor with outside air to liquefy it, and an expansion valve that expands and gasifies the refrigerant (liquid refrigerant) liquefied with the air-conditioning condenser. A refrigerant recovery condenser that liquefies the refrigerant vaporized by the valve (gas refrigerant) and an accumulator that stores the refrigerant (liquid refrigerant) liquefied by the refrigerant recovery condenser are provided. The refrigerant plays a role of transporting heat energy, and while releasing heat to the outside in the condenser for air conditioning, it receives heat from the outside air or the like after passing through the expansion valve.

冷凍空調機器に使用される各種冷媒は、地球温暖化係数及びオゾン層破壊係数が大きいため、大気中への排出が規制されている。したがって、特に、冷媒を交換する際又は冷凍空調機器を廃棄する際には、大気への冷媒の漏洩を極力抑制し、冷凍空調機器に充填されている冷媒を回収することが義務付けられている。同時に、環境負荷の小さな冷媒への転換も推進されており、近年では、代替フロンとしてＨＦＣ（Ｈｙｄｒｏｆｌｕｏｒｏｃａｒｂｏｎ）等の使用が主流となっている。ＨＦＣとしては、例えば、単体冷媒としてはＲ１３４ａまたはＲ３２、混合冷媒としてはＲ４１０ＡまたはＲ４０７Ｃがある。 Since various refrigerants used in refrigerating and air-conditioning equipment have a large global warming potential and ozone depletion potential, their emission into the atmosphere is regulated. Therefore, in particular, when replacing the refrigerant or disposing of the refrigerating and air-conditioning equipment, it is obligatory to suppress the leakage of the refrigerant to the atmosphere as much as possible and recover the refrigerant filled in the refrigerating and air-conditioning equipment. At the same time, the conversion to refrigerants with a small environmental load is being promoted, and in recent years, the use of HFCs (Hydrofluorocarbons) and the like as alternative CFCs has become the mainstream. Examples of HFCs include R134a or R32 as a single refrigerant and R410A or R407C as a mixed refrigerant.

冷媒の回収には、冷媒回収装置が使用される。冷媒回収装置においては、冷凍空調機器のアキュムレータにある冷媒を気化した後、ガス冷媒を冷媒回収装置内の圧縮機によって吸引し、断熱圧縮する。断熱圧縮されたガス冷媒を冷媒回収装置内の凝縮器によって液化し、液冷媒として回収ボンベに充填・回収する。回収した冷媒の量は、重量計により測定される。 A refrigerant recovery device is used to recover the refrigerant. In the refrigerant recovery device, after vaporizing the refrigerant in the accumulator of the refrigerating and air-conditioning device, the gas refrigerant is sucked by the compressor in the refrigerant recovery device and adiabatic compression is performed. The adiabatic compressed gas refrigerant is liquefied by the condenser in the refrigerant recovery device, and is filled and recovered in the recovery cylinder as a liquid refrigerant. The amount of recovered refrigerant is measured by a gravimetric scale.

特許文献１には、冷媒使用機器内の冷媒を冷媒回収装置により回収容器（回収ボンベ）に回収する際に、回収系統に空気等の非凝縮性ガスが混入すると、非凝縮性ガスも回収容器に回収されてしまうことが指摘されている（同文献の段落００５６参照）。非凝縮性ガスは、回収容器内で凝縮せず、圧縮ガスとして存在するため、回収容器内の液冷媒の量が増えて気相の体積が少なくなるにつれて、回収容器内の圧力及び温度が上昇してしまう。そのため、同文献では、回収容器内の温度が所定値に達した段階で、回収容器と、冷媒回収装置及び冷媒使用機器との連結を解除し、回収容器にガス分離装置を接続して、ガス分離装置により回収容器内の非凝縮性ガスを除去する技術を開示している。具体的には、回収容器内のガス冷媒と非凝縮性ガスの混合ガスを、ガス分離装置に送って分離し、非凝縮性ガスを大気中に排出すると共に、ガス冷媒を回収容器内に戻している。そして、回収容器内の非凝縮性ガスを除去した後、再度、回収容器に、冷媒回収装置及び冷媒使用機器を接続し、回収容器への冷媒の回収作業を再開している。 According to Patent Document 1, when a non-condensable gas such as air is mixed in the recovery system when the refrigerant in the equipment using the refrigerant is recovered in the recovery container (recovery cylinder) by the refrigerant recovery device, the non-condensable gas is also recovered in the recovery container. It has been pointed out that it will be recovered in (see paragraph 0056 of the same document). Since the non-condensable gas does not condense in the recovery container and exists as a compressed gas, the pressure and temperature in the recovery container increase as the amount of liquid refrigerant in the recovery container increases and the volume of the gas phase decreases. Resulting in. Therefore, in the same document, when the temperature inside the recovery container reaches a predetermined value, the connection between the recovery container and the refrigerant recovery device and the equipment using the refrigerant is disconnected, and the gas separation device is connected to the recovery container to obtain gas. It discloses a technique for removing non-condensable gas in a recovery container by a separation device. Specifically, the mixed gas of the gas refrigerant and the non-condensable gas in the recovery container is sent to the gas separation device to separate the gas, the non-condensable gas is discharged to the atmosphere, and the gas refrigerant is returned to the recovery container. ing. Then, after removing the non-condensable gas in the recovery container, the refrigerant recovery device and the refrigerant-using device are connected to the recovery container again, and the work of recovering the refrigerant to the recovery container is resumed.

特開２０１０－１５９９５２号公報Japanese Unexamined Patent Publication No. 2010-159952

上記したように、冷凍空調機器の冷媒回路からの冷媒回収では、冷媒回収装置で、冷媒を気化した後、断熱圧縮し、その後、液化して回収を行っている。そうした中、窒素（Ｎ２）、酸素（Ｏ２）などの空気を主成分とする非凝縮性ガスが冷媒に混入した場合、非凝縮性ガスは、冷媒回収装置で凝縮されず、ガスのままで回収ボンベに充填されることになる。その結果、回収ボンベの内圧が上昇し、液体冷媒が充填され難くなり、回収ボンベへの冷媒回収速度が低下することになる。よって、冷媒を全回収するまでに多くの時間を費やすことになる。As described above, in the refrigerant recovery from the refrigerant circuit of the refrigerating and air-conditioning equipment, the refrigerant is vaporized, adiabatically compressed, and then liquefied and recovered by the refrigerant recovery device. Under such circumstances, when a non-condensable gas containing air as a main component such as nitrogen (N 2 ) and oxygen (O 2 ) is mixed in the refrigerant, the non-condensable gas is not condensed by the refrigerant recovery device and remains as a gas. Will be filled in the recovery cylinder. As a result, the internal pressure of the recovery cylinder rises, it becomes difficult to fill the liquid refrigerant, and the speed of recovering the refrigerant to the recovery cylinder decreases. Therefore, it takes a lot of time to recover all the refrigerant.

この問題に対して、特許文献１では、ガス分離装置により回収容器内の非凝縮性ガスを除去しているが、冷媒回収の途中で、回収容器（回収ボンベ）と、冷媒回収装置及び冷媒使用機器との連結を解除して、回収容器をガス分離装置に接続する必要があり、また、非凝縮性ガスの除去処理が完了した際には、再度、回収容器と、冷媒回収装置及び冷媒使用機器とを接続する必要があるので、多くの手間がかかる。また、ガス分離装置から冷媒を、ガス冷媒（気相）の状態で回収容器に戻している（注入している）ので、冷媒を液化して注入する場合に比べて、回収容器の冷媒充填量が低下してしまう問題もある。 In response to this problem, in Patent Document 1, the non-condensable gas in the recovery container is removed by the gas separation device, but the recovery container (recovery cylinder), the refrigerant recovery device, and the refrigerant are used during the refrigerant recovery. It is necessary to disconnect the connection with the equipment and connect the recovery container to the gas separation device, and when the non-condensable gas removal process is completed, the recovery container, the refrigerant recovery device and the refrigerant are used again. Since it is necessary to connect to the device, it takes a lot of trouble. In addition, since the refrigerant is returned (injected) from the gas separator to the recovery container in the state of gas refrigerant (gas phase), the amount of refrigerant filled in the recovery container is compared with the case where the refrigerant is liquefied and injected. There is also a problem that the amount is reduced.

回収ボンベ、冷媒回収装置及び冷凍空調機器の接続を維持したまま、回収ボンベ内の非凝縮性ガスを低減できる改良された技術が必要である。本発明の目的は、冷凍空調機器から冷媒を回収する際に、回収ボンベ、冷媒回収装置及び冷凍空調機器の接続を維持したまま、回収ボンベ内の非凝縮性ガスを低減できるようにすることにある。 There is a need for improved technology that can reduce the non-condensable gas in the recovery cylinder while maintaining the connection of the recovery cylinder, refrigerant recovery device and refrigeration and air conditioning equipment. An object of the present invention is to make it possible to reduce the non-condensable gas in the recovery cylinder while maintaining the connection between the recovery cylinder, the refrigerant recovery device and the refrigerating / air-conditioning device when recovering the refrigerant from the refrigerating / air-conditioning device. be.

本発明の冷媒回収システムは、冷凍空調機器の冷媒回路から空調用冷媒を回収する冷媒回収システムであって、前記空調用冷媒に圧縮凝縮を行って圧縮凝縮冷媒を生成する冷媒回収装置と、前記冷媒回収装置が生成した前記圧縮凝縮冷媒を回収する回収ボンベと、前記圧縮凝縮冷媒を回収した前記回収ボンベの内部から前記空調用冷媒をガス成分として非凝縮性ガスと分離させるガス分離モジュールと、前記ガス分離モジュールが分離した前記空調用冷媒のガス成分を前記冷媒回路と前記冷媒回収装置の間の配管に再送させる再送配管と、を備え、前記冷媒回路の圧力が予め定められた圧力以下の場合に、前記ガス分離モジュールが分離した前記空調用冷媒のガス成分を、前記冷媒回路に送るように構成される、ことを特徴とする。 The refrigerant recovery system of the present invention is a refrigerant recovery system that recovers the air-conditioning refrigerant from the refrigerant circuit of the refrigerating and air-conditioning equipment, and is a refrigerant recovery device that compresses and condenses the air-conditioning refrigerant to generate the compressed and condensed refrigerant. A recovery cylinder that recovers the compressed and condensed refrigerant generated by the refrigerant recovery device, and a gas separation module that separates the air-conditioning refrigerant as a gas component from the inside of the recovery cylinder that recovers the compressed and condensed refrigerant from the non-condensable gas. The gas separation module includes a retransmission pipe that retransmits the gas component of the air-conditioning refrigerant separated to the pipe between the refrigerant circuit and the refrigerant recovery device, and the pressure of the refrigerant circuit is equal to or lower than a predetermined pressure. In this case, the gas separation module is configured to send the separated gas component of the air-conditioning refrigerant to the refrigerant circuit .

本発明の冷媒回収方法は、冷凍空調機器の冷媒回路から空調用冷媒を回収する冷媒回収方法であって、冷媒回収装置を用い、前記空調用冷媒に圧縮凝縮を行って圧縮凝縮冷媒を生成する生成ステップと、前記冷媒回収装置が生成した前記圧縮凝縮冷媒を回収ボンベに回収する回収ステップと、ガス分離モジュールを用い、前記圧縮凝縮冷媒を回収した前記回収ボンベの内部から前記空調用冷媒をガス成分として非凝縮性ガスと分離させる分離ステップと、前記ガス分離モジュールが分離した前記空調用冷媒のガス成分を前記冷媒回路と前記冷媒回収装置の間の配管に再送させる再送ステップと、前記冷媒回路の圧力が予め定められた圧力以下の場合に、前記ガス分離モジュールが分離した前記空調用冷媒のガス成分を、前記冷媒回路に送るステップと、を備えることを特徴とする。 The refrigerant recovery method of the present invention is a refrigerant recovery method for recovering an air conditioning refrigerant from a refrigerant circuit of a refrigerating and air-conditioning device, and uses a refrigerant recovery device to compress and condense the air conditioning refrigerant to generate a compressed condensed refrigerant. The generation step, the recovery step of recovering the compressed and condensed refrigerant generated by the refrigerant recovery device in the recovery cylinder, and the gas of the air-conditioning refrigerant from the inside of the recovery bomb in which the compressed and condensed refrigerant is recovered by using the gas separation module. A separation step for separating the non-condensable gas as a component, a retransmission step for retransmitting the gas component of the air-conditioning refrigerant separated by the gas separation module to a pipe between the refrigerant circuit and the refrigerant recovery device, and the refrigerant circuit . It is characterized by comprising a step of sending the gas component of the air-conditioning refrigerant separated by the gas separation module to the refrigerant circuit when the pressure of the above is equal to or lower than a predetermined pressure .

本発明によれば、冷凍空調機器から冷媒を回収する際に、回収ボンベ、冷媒回収装置及び冷凍空調機器の接続を維持したまま、回収ボンベ内の非凝縮性ガスを低減することができる。 According to the present invention, when the refrigerant is recovered from the refrigerating and air-conditioning equipment, the non-condensable gas in the recovery cylinder can be reduced while maintaining the connection between the recovery cylinder, the refrigerant recovery device and the refrigerating and air-conditioning equipment.

本発明の実施形態に係る冷媒回収システムの概略図である。It is a schematic diagram of the refrigerant recovery system which concerns on embodiment of this invention. 発送制御部のブロック図である。It is a block diagram of a shipping control unit. 各種冷媒の温度に対する飽和蒸気圧の特性（圧力特性）を示す図である。It is a figure which shows the characteristic (pressure characteristic) of the saturated vapor pressure with respect to the temperature of various refrigerants. 三方弁制御部のブロック図である。It is a block diagram of a three-way valve control unit. 無機系分離膜によるガス分離を説明するための図である。It is a figure for demonstrating gas separation by an inorganic separation membrane. 有機系分離膜によるガス分離を説明するための図である。It is a figure for demonstrating gas separation by an organic separation membrane. 本発明の実施形態に係る冷媒回収方法のフローチャートである。It is a flowchart of the refrigerant recovery method which concerns on embodiment of this invention. 第１三方弁制御のフローチャートである。It is a flowchart of 1st three-way valve control. 第２三方弁制御のフローチャートである。It is a flowchart of the 2nd three-way valve control. 本発明の別の実施形態に係る冷媒回収システムの概略図である。It is a schematic diagram of the refrigerant recovery system which concerns on another embodiment of this invention.

以下、本発明に係る実施形態について添付図面を参照しながら詳細に説明する。以下で述べる構成は、説明のための例示であって、システム、装置等の仕様に合わせて適宜変更が可能である。また、以下において複数の実施形態や変形例などが含まれる場合、それらの特徴部分を適宜に組み合わせて用いることは当初から想定されている。全ての図面において同一の要素には同一の符号を付し、重複する説明を省略する。 Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. The configuration described below is an example for explanation, and can be appropriately changed according to the specifications of the system, the device, and the like. Further, when a plurality of embodiments, modifications, and the like are included in the following, it is assumed from the beginning that those characteristic portions are appropriately combined and used. The same elements are designated by the same reference numerals in all drawings, and duplicate description is omitted.

図１は、本発明の実施形態に係る冷媒回収システム１０の概略図である。図中、太い実線は流体が流れる配管を示し、一点鎖線は各制御部に入出力する制御線を示す。冷媒回収システム１０は、冷凍空調機器から空調用冷媒を回収して、回収ボンベ１６に充填するためのシステムである。以下では、冷凍空調機器としての空調装置１２から空調用冷媒を回収する例について説明するが、冷媒回収システム１０は、冷媒を使用する機器全般の冷媒回収に適用可能である。なお、空調用冷媒とは、冷凍空調機器の運転時に、熱エネルギーを運搬すると共に液相と気相の間で相変化することで、冷凍空調機器における空気等の冷却機能と加熱機能の少なくとも一方を実現させる冷媒である。 FIG. 1 is a schematic view of a refrigerant recovery system 10 according to an embodiment of the present invention. In the figure, the thick solid line indicates the piping through which the fluid flows, and the alternate long and short dash line indicates the control line to be input / output to each control unit. The refrigerant recovery system 10 is a system for recovering air-conditioning refrigerant from refrigerating and air-conditioning equipment and filling the recovery cylinder 16. Hereinafter, an example of recovering the air-conditioning refrigerant from the air-conditioning device 12 as the refrigerating and air-conditioning equipment will be described, but the refrigerant recovery system 10 can be applied to the refrigerant recovery of all the equipment using the refrigerant. The air-conditioning refrigerant carries heat energy during operation of the refrigerating and air-conditioning equipment and changes the phase between the liquid phase and the gas phase, so that at least one of the cooling function and the heating function of air and the like in the refrigerating and air-conditioning equipment. It is a refrigerant that realizes.

冷媒回収システム１０は、空調装置１２の冷媒回路３０から空調用冷媒を吸引して断熱圧縮し、圧縮された冷媒を凝縮して液体化して圧縮凝縮冷媒を生成する冷媒回収装置１４と、冷媒回収装置１４が生成した圧縮凝縮冷媒を回収する回収ボンベ１６と、圧縮凝縮冷媒を回収した回収ボンベ１６の内部に含まれるガス成分２２から空調用冷媒を分離させるガス分離モジュール６８と、ガス分離モジュール６８が分離した空調用冷媒を冷媒回収装置１４に再送させる再送配管５８と、冷媒回路３０と冷媒回収装置１４の間に配置された三方弁４０と、を備える。以下説明するように、ガス分離モジュール６８と再送配管５８を含んで分離装置１８が構成される。空調装置１２は、冷媒回路３０に繋がるサービスポート３４を含み、冷媒回路３０は、液冷媒が貯蔵されたアキュムレータ３２を含む。冷媒回収装置１４は、アキュムレータ３２内の液冷媒を気化したガス冷媒をサービスポート３４を介して吸引する。 The refrigerant recovery system 10 sucks the air-conditioning refrigerant from the refrigerant circuit 30 of the air-conditioning device 12, heat-insulates and compresses it, condenses the compressed refrigerant and liquefies it to generate the compressed condensed refrigerant, and the refrigerant recovery device 14. A recovery cylinder 16 for recovering the compressed and condensed refrigerant generated by the apparatus 14, a gas separation module 68 for separating the air-conditioning refrigerant from the gas component 22 contained inside the recovery bomb 16 for recovering the compressed and condensed refrigerant, and a gas separation module 68. It is provided with a retransmission pipe 58 for retransmitting the separated air-conditioning refrigerant to the refrigerant recovery device 14, and a three-way valve 40 arranged between the refrigerant circuit 30 and the refrigerant recovery device 14. As will be described below, the separation device 18 is configured to include the gas separation module 68 and the retransmission pipe 58. The air conditioner 12 includes a service port 34 connected to the refrigerant circuit 30, and the refrigerant circuit 30 includes an accumulator 32 in which a liquid refrigerant is stored. The refrigerant recovery device 14 sucks the gas refrigerant vaporized from the liquid refrigerant in the accumulator 32 through the service port 34.

冷媒回収装置１４は、圧縮機と凝縮器を含む、広く市販されているフロン回収機を使用可能である。冷媒回収装置１４は、冷媒回路３０からの空調用冷媒を取り込む入口３６（取り込み口）と、圧縮凝縮冷媒を排出する出口３８と、入口３６における空調用冷媒の圧力を検出する圧力検出器３７とを含む。 The refrigerant recovery device 14 can use a widely commercially available Freon recovery machine including a compressor and a condenser. The refrigerant recovery device 14 includes an inlet 36 (intake port) for taking in the air-conditioning refrigerant from the refrigerant circuit 30, an outlet 38 for discharging the compressed condensed refrigerant, and a pressure detector 37 for detecting the pressure of the air-conditioning refrigerant at the inlet 36. including.

回収ボンベ１６は、冷媒回収装置１４からの圧縮凝縮冷媒を回収ボンベ１６内に入れる液出入口４６と、回収ボンベ１６内のガス成分２２を出すガス出入口４８とを含む。 The recovery cylinder 16 includes a liquid inlet / outlet 46 for putting the compressed condensed refrigerant from the refrigerant recovery device 14 into the recovery cylinder 16 and a gas inlet / outlet 48 for discharging the gas component 22 in the recovery cylinder 16.

三方弁４０は、第１、２および３ポート４１、４２、４３を含む。空調装置１２のサービスポート３４と、三方弁４０の第１ポート４１とが接続配管５０により接続されており、三方弁４０の第２ポート４２と、冷媒回収装置１４の入口３６とが前配管５２により接続されており、三方弁４０の第３ポート４３と、再送配管５８とが接続されている。また、冷媒回収装置１４の出口３８と、回収ボンベ１６の液出入口４６とが後配管５４により接続されている。一般的な冷媒回収を行う際には、三方弁４０の第１ポート４１と第２ポート４２を連通状態にする（通常モード）。 The three-way valve 40 includes first, second and third ports 41, 42, 43. The service port 34 of the air conditioner 12 and the first port 41 of the three-way valve 40 are connected by a connecting pipe 50, and the second port 42 of the three-way valve 40 and the inlet 36 of the refrigerant recovery device 14 are connected to the front pipe 52. The third port 43 of the three-way valve 40 and the retransmission pipe 58 are connected to each other. Further, the outlet 38 of the refrigerant recovery device 14 and the liquid inlet / outlet 46 of the recovery cylinder 16 are connected by a rear pipe 54. When performing general refrigerant recovery, the first port 41 and the second port 42 of the three-way valve 40 are in a communicating state (normal mode).

バルブの不良、配管等の腐食、冷媒の分解、修理時の空気侵入等により、空調装置１２の空調用冷媒（以下、単に冷媒とも言う）には、空気（窒素、酸素等）を主成分とする非凝縮性ガスが混入することがある。冷媒回収において、冷媒と一緒に非凝縮性ガスが冷媒回収装置１４に吸引された際には、非凝縮性ガスは、冷媒回収装置１４で凝縮されず、ガスのままで回収ボンベ１６に充填される。その結果、回収ボンベ１６の内圧が上昇し、液冷媒が充填され難くなって、回収ボンベ１６への冷媒回収速度が低下する。それに対処するため、冷媒回収システム１０は、回収ボンベ１６内の非凝縮性ガスを除去するための分離装置１８を備える。なお、回収ボンベ１６内では、液冷媒２０の一部が再気化したガス冷媒と、非凝縮性ガスとが合わさって混合ガス２２（ガス成分２２）が生じる。 Air (nitrogen, oxygen, etc.) is the main component of the air-conditioning refrigerant (hereinafter, simply referred to as the refrigerant) of the air-conditioning device 12 due to defective valves, corrosion of pipes, decomposition of the refrigerant, air intrusion during repair, etc. Non-condensable gas may be mixed. In the refrigerant recovery, when the non-condensable gas is sucked into the refrigerant recovery device 14 together with the refrigerant, the non-condensable gas is not condensed by the refrigerant recovery device 14 and is filled in the recovery bomb 16 as it is. To. As a result, the internal pressure of the recovery cylinder 16 rises, it becomes difficult to fill the liquid refrigerant, and the refrigerant recovery speed to the recovery cylinder 16 decreases. To deal with this, the refrigerant recovery system 10 includes a separation device 18 for removing the non-condensable gas in the recovery cylinder 16. In the recovery cylinder 16, a gas refrigerant in which a part of the liquid refrigerant 20 is revaporized and a non-condensable gas are combined to generate a mixed gas 22 (gas component 22).

分離装置１８は、回収ボンベ１６のガス出入口４８と接続されたガス流入口６０と、ガス流入口６０から取り込まれた混合ガス２２が流れる発送配管５６と、発送配管５６内の混合ガス２２が送り込まれ、混合ガス２２からガス冷媒と非凝縮性ガスとを分離させるガス分離モジュール６８と、ガス分離モジュール６８に接続された再送配管５８と、を含む。ガス分離モジュール６８は、混合ガス２２を取り入れる入口９０と、ガス分離を行う分離膜９２と、分離膜９２により分離された非凝縮性ガスを大気に放出する放出口９４と、分離膜９２により混合ガス２２に比べて非凝縮性ガスが低減されたガス成分である再送ガス冷媒（空調用冷媒）を排出する出口９６と、を含む。 In the separating device 18, the gas inlet 60 connected to the gas inlet / outlet 48 of the recovery cylinder 16, the shipping pipe 56 through which the mixed gas 22 taken in from the gas inlet 60 flows, and the mixed gas 22 in the shipping pipe 56 are sent. It includes a gas separation module 68 that separates the gas refrigerant and the non-condensable gas from the mixed gas 22, and a retransmission pipe 58 connected to the gas separation module 68. The gas separation module 68 is mixed by an inlet 90 for taking in the mixed gas 22, a separation film 92 for gas separation, a discharge port 94 for discharging the non-condensable gas separated by the separation film 92 to the atmosphere, and a separation film 92. It includes an outlet 96 for discharging a retransmitted gas refrigerant (air conditioning refrigerant), which is a gas component having a reduced non-condensable gas as compared with the gas 22.

発送配管５６の一端がガス流入口６０であり、発送配管５６の他端は、ガス分離モジュール６８の入口９０に接続されている。再送配管５８の一端は、ガス分離モジュール６８の出口９６に接続されており、再送配管５８の他端は、ガス流出口７４として、三方弁４０の第３ポート４３に接続されている。 One end of the shipping pipe 56 is a gas inflow port 60, and the other end of the shipping pipe 56 is connected to the inlet 90 of the gas separation module 68. One end of the retransmission pipe 58 is connected to the outlet 96 of the gas separation module 68, and the other end of the retransmission pipe 58 is connected to the third port 43 of the three-way valve 40 as a gas outlet 74.

なお、以降説明するように、発送配管５６と再送配管５８には検出器や弁等が配置されるが、それらのいくつかを省略して冷媒回収システムを構成することもできる。このような構成も含めた、冷媒回収システムの基本となる冷媒回収方法は次の（１）～（４）のステップを備える。（１）三方弁４０の第１、２ポート４１、４２を連通状態とし（以下、通常モードと言う）、冷媒回路３０の空調用冷媒を、接続配管５０と前配管５２を通して冷媒回収装置１４に導き、冷媒回収装置１４を用いて空調用冷媒に圧縮凝縮を行って圧縮凝縮冷媒を生成する生成ステップ。（２）冷媒回収装置１４が生成した圧縮凝縮冷媒を後配管５４を通して回収ボンベ１６に回収する回収ステップ。（３）回収ボンベ１６の内部に含まれるガス成分２２を発送配管５６を通してガス分離モジュール６８に導き、ガス分離モジュール６８を用いて、ガス成分２２から非凝縮性ガスと再送ガス冷媒（空調用冷媒）を分離させる分離ステップ。（４）三方弁４０の第２、３ポート４２、４３を連通状態とし（以下、循環モードと言う）、ガス分離モジュール６８が分離した再送ガス冷媒を、再送配管５８と前配管５２を通して、冷媒回収装置１４に再送させる再送ステップ。 As will be described later, detectors, valves, and the like are arranged in the delivery pipe 56 and the retransmission pipe 58, but some of them may be omitted to configure the refrigerant recovery system. The refrigerant recovery method, which is the basis of the refrigerant recovery system including such a configuration, includes the following steps (1) to (4). (1) The first and second ports 41 and 42 of the three-way valve 40 are in a communicating state (hereinafter referred to as a normal mode), and the air-conditioning refrigerant of the refrigerant circuit 30 is passed through the connecting pipe 50 and the front pipe 52 to the refrigerant recovery device 14. A generation step of guiding and compressing and condensing the air-conditioning refrigerant using the refrigerant recovery device 14 to generate the compressed and condensed refrigerant. (2) A recovery step of recovering the compressed condensed refrigerant generated by the refrigerant recovery device 14 to the recovery cylinder 16 through the rear pipe 54. (3) The gas component 22 contained inside the recovery cylinder 16 is guided to the gas separation module 68 through the shipping pipe 56, and the gas component 22 is used to connect the non-condensable gas and the retransmission gas refrigerant (refrigerant for air conditioning) from the gas component 22. ) Separation step. (4) The second and third ports 42 and 43 of the three-way valve 40 are in a communicating state (hereinafter referred to as circulation mode), and the retransmitted gas refrigerant separated by the gas separation module 68 is passed through the retransmission pipe 58 and the front pipe 52 as a refrigerant. Retransmission step to retransmit to the recovery device 14.

図１の冷媒回収システム１０の説明を続ける。分離装置１８は、さらに、発送配管５６に配置された圧力検出器６１、温度検出器６２、制御弁６４および減圧弁６６と、再送配管５８に配置された圧力検出器７０および圧力調整器７２と、発送制御部７６と、再送制御部７８と、三方弁制御部８０とを備える。発送配管５６上の圧力検出器６１および温度検出器６２は、制御弁６４よりも回収ボンベ１６側に位置し、回収ボンベ１６内の圧力および温度を検出する。再送配管５８上の圧力検出器７０は、圧力調整器７２よりも上流側（ガス分離モジュール６８側）の再送配管５８内の圧力を検出する。圧力調整器７２は、圧力調整器７２よりも下流側（ガス流出口７４側）の再送配管５８内の圧力を調整する。 The description of the refrigerant recovery system 10 of FIG. 1 will be continued. The separator 18 further includes a pressure detector 61, a temperature detector 62, a control valve 64 and a pressure reducing valve 66 arranged in the shipping pipe 56, and a pressure detector 70 and a pressure regulator 72 arranged in the retransmission pipe 58. , A delivery control unit 76, a retransmission control unit 78, and a three-way valve control unit 80. The pressure detector 61 and the temperature detector 62 on the delivery pipe 56 are located on the recovery cylinder 16 side of the control valve 64, and detect the pressure and temperature in the recovery cylinder 16. The pressure detector 70 on the retransmission pipe 58 detects the pressure in the retransmission pipe 58 on the upstream side (gas separation module 68 side) of the pressure regulator 72. The pressure regulator 72 adjusts the pressure in the retransmission pipe 58 on the downstream side (gas outlet 74 side) of the pressure regulator 72.

発送制御部７６、再送制御部７８、および三方弁制御部８０は、コントローラであり、例えばＣＰＵ、ＲＯＭ、ＲＡＭ、フラッシュメモリ、入出力ポート等を備えたマイクロコンピュータである。これらの制御部は、共通の１つのマイクロコンピュータにより実現されてもよい。また、これらの制御部は、マイクロコンピュータに代えて、または、それと共にＡＳＩＣ（Application Specific Integrated Circuit）等を含んでもよい。 The delivery control unit 76, the retransmission control unit 78, and the three-way valve control unit 80 are controllers, for example, a microcomputer provided with a CPU, ROM, RAM, flash memory, input / output ports, and the like. These control units may be realized by one common microcomputer. Further, these control units may include an ASIC (Application Specific Integrated Circuit) or the like in place of or together with the microcomputer.

発送制御部７６は、圧力検出器６１および温度検出器６２のそれぞれの検出値ＤＰ、ＤＴに基づいて、回収ボンベ１６内から非凝縮性ガスを除去する必要があるか否かを判断し、除去の必要ありと判断した際には制御弁６４を開状態とし、除去の必要なしと判断した際には制御弁６４を閉状態とする。三方弁制御部８０は、三方弁４０を制御して、制御弁６４が閉状態の場合には第１ポート４１と第２ポート４２を連通状態とし（通常モード）、制御弁６４が開状態の場合には、第２ポート４２と第３ポート４３を連通状態とする（循環モード）か、または、第１ポート４１と第３ポート４３を連通状態とする（以下、気化促進モードと言う）。このように、図１の実施形態では、基本となる冷媒回収方法に対して、気化促進モードが付加されている。 The shipping control unit 76 determines whether or not it is necessary to remove the non-condensable gas from the inside of the recovery cylinder 16 based on the detection values DP and DT of the pressure detector 61 and the temperature detector 62, respectively, and removes the non-condensable gas. When it is determined that the control valve 64 is necessary, the control valve 64 is opened, and when it is determined that the removal is not necessary, the control valve 64 is closed. The three-way valve control unit 80 controls the three-way valve 40, and when the control valve 64 is in the closed state, the first port 41 and the second port 42 are in a communicating state (normal mode), and the control valve 64 is in an open state. In this case, the second port 42 and the third port 43 are put into a communicating state (circulation mode), or the first port 41 and the third port 43 are put into a communicating state (hereinafter, referred to as a vaporization promotion mode). As described above, in the embodiment of FIG. 1, the vaporization promotion mode is added to the basic refrigerant recovery method.

通常モードは、空調装置１２から回収ボンベ１６に冷媒回収を行うモードである。循環モードは、分離装置１８、冷媒回収装置１４、及び回収ボンベ１６の循環ループを形成して、繰り返し、回収ボンベ１６内の混合ガス２２をガス分離モジュール６８に送り込んで、回収ボンベ１６内の非凝縮性ガスを除去するモードである。気化促進モードは、空調装置１２の冷媒回路３０内の冷媒が低温凝縮する可能性がある場合に、回収ボンベ１６内の混合ガス２２の一部を、分離装置１８から冷媒回路３０内に送り込み、冷媒回路３０内の冷媒の温度を上昇させ、冷媒の気化を促進させるモードである。なお、冷媒回収装置１４を通過したガス冷媒は、断熱圧縮されるため、冷媒回路３０内、すなわち冷媒回収装置１４に流入する時よりも温度が高くなる。そのため、冷媒回収装置１４から回収ボンベ１６に入る冷媒は、温度が高くなっている。 The normal mode is a mode in which the refrigerant is recovered from the air conditioner 12 to the recovery cylinder 16. In the circulation mode, a circulation loop of the separation device 18, the refrigerant recovery device 14, and the recovery cylinder 16 is repeatedly formed, and the mixed gas 22 in the recovery cylinder 16 is sent to the gas separation module 68 to send the mixed gas 22 in the recovery cylinder 16 to the non-recovery cylinder 16. This mode removes condensable gas. In the vaporization promotion mode, when the refrigerant in the refrigerant circuit 30 of the air conditioner 12 may be condensed at a low temperature, a part of the mixed gas 22 in the recovery cylinder 16 is sent from the separation device 18 into the refrigerant circuit 30. This mode raises the temperature of the refrigerant in the refrigerant circuit 30 and promotes the vaporization of the refrigerant. Since the gas refrigerant that has passed through the refrigerant recovery device 14 is adiabatically compressed, the temperature is higher than when it flows into the refrigerant circuit 30, that is, the refrigerant recovery device 14. Therefore, the temperature of the refrigerant entering the recovery cylinder 16 from the refrigerant recovery device 14 is high.

図２は、発送制御部７６のブロック図である。発送制御部７６は、参照圧力取得部１０４と、減圧弁制御部１０６と、判定部１０８とを備える。分離装置１８は、キーパッドやバーコードリーダ等の入力部１００と、フラッシュメモリ等の記憶部１０２とを備える。発送制御部７６には、入力部１００と記憶部１０２とが電気的に接続されている。なお、発送制御部７６内にあるメモリを、記憶部１０２として使用してもよい。 FIG. 2 is a block diagram of the shipping control unit 76. The delivery control unit 76 includes a reference pressure acquisition unit 104, a pressure reducing valve control unit 106, and a determination unit 108. The separation device 18 includes an input unit 100 such as a keypad and a bar code reader, and a storage unit 102 such as a flash memory. The input unit 100 and the storage unit 102 are electrically connected to the delivery control unit 76. The memory in the shipping control unit 76 may be used as the storage unit 102.

冷媒回収の前に、入力部１００から回収する冷媒（以下、回収冷媒とも言う）の種類を示す回収冷媒情報１１０が入力され、記憶部１０２に格納される。例えば、空調装置１２の筐体の表面に付された、空調装置１２で使用している冷媒の種類を示すバーコードを、入力部１００としてのバーコードリーダで読み取ることで、回収冷媒情報１１０が記憶部１０２に格納される。また、記憶部１０２には、複数種類の冷媒毎に、温度に対する飽和蒸気圧の特性（以下、圧力特性１１２と言う）が予め格納されている。図３には、Ａ、Ｂ、Ｃ、およびＤの各冷媒の圧力特性が示されている。 Prior to the refrigerant recovery, the recovered refrigerant information 110 indicating the type of the refrigerant recovered from the input unit 100 (hereinafter, also referred to as the recovered refrigerant) is input and stored in the storage unit 102. For example, by reading a bar code attached to the surface of the housing of the air conditioner 12 indicating the type of the refrigerant used in the air conditioner 12 with a bar code reader as the input unit 100, the recovered refrigerant information 110 can be obtained. It is stored in the storage unit 102. Further, the storage unit 102 stores in advance the characteristic of saturated vapor pressure with respect to temperature (hereinafter referred to as pressure characteristic 112) for each of a plurality of types of refrigerants. FIG. 3 shows the pressure characteristics of each of the refrigerants A, B, C, and D.

参照圧力取得部１０４には、発送配管５６上の温度検出器６２の検出温度ＤＴ（回収ボンベ１６内の温度）が入力される。参照圧力取得部１０４は、回収冷媒情報１１０が示す回収冷媒に対応する圧力特性１１２を記憶部１０２から読み出して、図３のように、検出温度ＤＴ（回収ボンベ１６内の温度）における回収冷媒（図３の例では冷媒Ａ）の飽和蒸気圧を、参照圧力ＲＰとして取得する。そして、参照圧力取得部１０４は、参照圧力ＲＰを判定部１０８に出力する。 The detection temperature DT (temperature in the recovery cylinder 16) of the temperature detector 62 on the shipping pipe 56 is input to the reference pressure acquisition unit 104. The reference pressure acquisition unit 104 reads the pressure characteristic 112 corresponding to the recovery refrigerant indicated by the recovery refrigerant information 110 from the storage unit 102, and as shown in FIG. 3, the recovery refrigerant (the temperature in the recovery cylinder 16) at the detection temperature DT (the temperature inside the recovery cylinder 16). In the example of FIG. 3, the saturated vapor pressure of the refrigerant A) is acquired as the reference pressure RP. Then, the reference pressure acquisition unit 104 outputs the reference pressure RP to the determination unit 108.

判定部１０８には、参照圧力ＲＰと、発送配管５６上の圧力検出器６１の検出圧力ＤＰ（回収ボンベ１６内の圧力）とが入力される。ここで、図３に示すように参照圧力ＲＰ（回収冷媒の飽和蒸気圧）よりも検出圧力ＤＰが高い場合には、回収ボンベ１６内に非凝縮性ガスが混入していることを示す。そこで、判定部１０８は、検出圧力ＤＰが参照圧力ＲＰよりも高い状態（以下、高圧状態とも言う）の場合には、制御弁６４を開状態に制御し、回収ボンベ１６内の混合ガス２２をガス分離モジュール６８に送る。一方、判定部１０８は、高圧状態ではない場合には、制御弁６４を閉状態のままとする。また、判定部１０８は、非凝縮性ガスの除去を行っている状態か否かを示す除去信号を出力する。除去信号は、制御弁６４が閉状態の場合にＬｏｗとなり、制御弁６４が開状態の場合にＨｉｇｈとなる信号である。 The reference pressure RP and the detection pressure DP (pressure in the recovery cylinder 16) of the pressure detector 61 on the shipping pipe 56 are input to the determination unit 108. Here, when the detected pressure DP is higher than the reference pressure RP (saturated vapor pressure of the recovered refrigerant) as shown in FIG. 3, it indicates that the non-condensable gas is mixed in the recovered cylinder 16. Therefore, when the detected pressure DP is higher than the reference pressure RP (hereinafter, also referred to as a high pressure state), the determination unit 108 controls the control valve 64 to be in the open state, and controls the mixed gas 22 in the recovery cylinder 16. It is sent to the gas separation module 68. On the other hand, the determination unit 108 keeps the control valve 64 in the closed state when it is not in the high pressure state. Further, the determination unit 108 outputs a removal signal indicating whether or not the non-condensable gas is being removed. The removal signal is a signal that becomes Low when the control valve 64 is in the closed state and becomes High when the control valve 64 is in the open state.

減圧弁制御部１０６には、発送配管５６上の圧力検出器６１の検出圧力ＤＰ（回収ボンベ１６内の圧力）が入力される。減圧弁制御部１０６は、制御弁６４が開状態となり、回収ボンベ１６内の混合ガス２２がガス分離モジュール６８に送り込まれた際に、ガス分離モジュール６８の分離膜９２が回収ボンベ１６内の圧力により損傷しないように、検出圧力ＤＰに基づいて減圧弁６６を制御する。減圧弁６６の制御により、減圧弁６６よりも下流側（ガス分離モジュール６８側）の配管内圧力が調整される。 The detection pressure DP (pressure in the recovery cylinder 16) of the pressure detector 61 on the delivery pipe 56 is input to the pressure reducing valve control unit 106. In the pressure reducing valve control unit 106, when the control valve 64 is opened and the mixed gas 22 in the recovery cylinder 16 is sent to the gas separation module 68, the separation membrane 92 of the gas separation module 68 presses the pressure in the recovery cylinder 16. The pressure reducing valve 66 is controlled based on the detected pressure DP so as not to be damaged by the gas cylinder. By controlling the pressure reducing valve 66, the pressure inside the pipe on the downstream side (gas separation module 68 side) of the pressure reducing valve 66 is adjusted.

図４は、三方弁制御部８０のブロック図である。三方弁制御部８０は、判定部１１８を備える。三方弁制御部８０には、キーパッド等の入力部１００と、フラッシュメモリ等の記憶部１０２とが電気的に接続されている。なお、三方弁制御部８０内にあるメモリを、記憶部１０２として使用してもよい。 FIG. 4 is a block diagram of the three-way valve control unit 80. The three-way valve control unit 80 includes a determination unit 118. An input unit 100 such as a keypad and a storage unit 102 such as a flash memory are electrically connected to the three-way valve control unit 80. The memory in the three-way valve control unit 80 may be used as the storage unit 102.

冷媒回収の前に、入力部１００から、気化促進モードへの遷移条件としての圧力閾値１２０と、気化促進モードの継続時間１２２とが入力され、記憶部１０２に格納される。判定部１１８には、除去信号と、冷媒回収装置１４の圧力検出器３７の検出圧力ＤＰＳ（冷媒回収装置１４の入口３６における圧力）と、記憶部１０２にある圧力閾値１２０および継続時間１２２とが入力される。ここで、検出圧力ＤＰＳは、通常モードにおいて空調装置１２の冷媒回路３０の圧力を示す。 Prior to the recovery of the refrigerant, the pressure threshold value 120 as a transition condition to the vaporization promotion mode and the duration 122 of the vaporization promotion mode are input from the input unit 100 and stored in the storage unit 102. The determination unit 118 has a removal signal, a detection pressure DPS (pressure at the inlet 36 of the refrigerant recovery device 14) of the pressure detector 37 of the refrigerant recovery device 14, a pressure threshold value 120 and a duration 122 in the storage unit 102. Entered. Here, the detected pressure DPS indicates the pressure of the refrigerant circuit 30 of the air conditioner 12 in the normal mode.

判定部１１８は、除去信号がＬｏｗの場合には、三方弁４０の第１ポート４１と第２ポート４２が連通状態（通常モード）となるように三方弁４０を制御する。また、判定部１１８は、除去信号がＬｏｗからＨｉｇｈに変わった際には、検出圧力ＤＰＳ（冷媒回路３０の圧力）と圧力閾値１２０の比較結果に基づいて、循環モードと気化促進モードのうち、どちらに三方弁４０を制御するかを決める。具体的には、判定部１１８は、検出圧力ＤＰＳが圧力閾値１２０より高い場合には、冷媒回路３０内の冷媒が低温凝縮する可能性が低いと推定し、三方弁４０の第２ポート４２と第３ポート４３が連通状態（循環モード）となるように三方弁４０を制御する。一方、判定部１１８は、検出圧力ＤＰＳが圧力閾値１２０以下の場合には、冷媒回路３０内の冷媒が低温凝縮する可能性があると推定し、三方弁４０の第１ポート４１と第３ポート４３が連通状態（気化促進モード）となるように三方弁４０を制御する。また、判定部１１８は、気化促進モードに遷移させてから、継続時間１２２だけ時間が経過した際には、気化促進モードから循環モードに三方弁４０を制御する。また、判定部１１８は、現在、通常モード、循環モード、または気化促進モードのいずれの状態であるかを示す三方弁信号を出力する。 When the removal signal is Low, the determination unit 118 controls the three-way valve 40 so that the first port 41 and the second port 42 of the three-way valve 40 are in a communicating state (normal mode). Further, when the removal signal changes from Low to High, the determination unit 118 is selected from the circulation mode and the vaporization promotion mode based on the comparison result between the detected pressure DPS (pressure of the refrigerant circuit 30) and the pressure threshold value 120. Decide which way to control the three-way valve 40. Specifically, when the detected pressure DPS is higher than the pressure threshold value 120, the determination unit 118 estimates that the refrigerant in the refrigerant circuit 30 is unlikely to condense at a low temperature, and determines that the third port 42 of the three-way valve 40 is used. The three-way valve 40 is controlled so that the third port 43 is in the communication state (circulation mode). On the other hand, the determination unit 118 estimates that when the detected pressure DPS is the pressure threshold value 120 or less, the refrigerant in the refrigerant circuit 30 may condense at a low temperature, and the first port 41 and the third port of the three-way valve 40 The three-way valve 40 is controlled so that the 43 is in a communication state (vaporization promotion mode). Further, the determination unit 118 controls the three-way valve 40 from the vaporization promotion mode to the circulation mode when the duration 122 has elapsed since the transition to the vaporization promotion mode. Further, the determination unit 118 outputs a three-way valve signal indicating which of the normal mode, the circulation mode, and the vaporization promotion mode is currently in.

図１に示すように、再送制御部７８には、三方弁信号と、再送配管５８上の圧力検出器７０の検出圧力ＤＰＲ（再送配管５８内の圧力）と、冷媒回収装置１４の圧力検出器３７の検出圧力ＤＰＳ（冷媒回収装置１４の入口３６における圧力）とが入力される。再送制御部７８は、三方弁信号が循環モードを示す場合には、検出圧力ＤＰＲ、ＤＰＳに基づいて、冷媒回収装置１４の入口３６における圧力よりも、圧力調整器７２の下流側（ガス流出口７４側）の再送配管５８内の圧力が高くなるように圧力調整器７２を制御する。これにより、前配管５２から再送配管５８に向かって冷媒が逆流することを防止することができる。また、再送制御部７８は、三方弁信号が気化促進モードを示す場合には、圧力調整器７２の下流側（ガス流出口７４側）の再送配管５８内の圧力が、空調装置１２の冷媒回路３０内にガスを送り込むことができる予め定められた圧力となるように圧力調整器７２を制御する。 As shown in FIG. 1, the retransmission control unit 78 includes a three-way valve signal, a detection pressure DPR (pressure in the retransmission pipe 58) of the pressure detector 70 on the retransmission pipe 58, and a pressure detector of the refrigerant recovery device 14. The detection pressure DPS (pressure at the inlet 36 of the refrigerant recovery device 14) of 37 is input. When the three-way valve signal indicates the circulation mode, the retransmission control unit 78 is located on the downstream side (gas outlet) of the pressure regulator 72 with respect to the pressure at the inlet 36 of the refrigerant recovery device 14 based on the detected pressures DPR and DPS. The pressure regulator 72 is controlled so that the pressure in the retransmission pipe 58 on the 74 side) becomes high. This makes it possible to prevent the refrigerant from flowing back from the front pipe 52 toward the retransmission pipe 58. Further, in the retransmission control unit 78, when the three-way valve signal indicates the vaporization promotion mode, the pressure in the retransmission pipe 58 on the downstream side (gas outlet 74 side) of the pressure regulator 72 is the refrigerant circuit of the air conditioner 12. The pressure regulator 72 is controlled so as to have a predetermined pressure at which gas can be sent into the 30.

次に、ガス分離モジュール６８について説明する。図１に示すように、ガス分離モジュール６８は、筒状の筐体８８と、筐体８８の中に配置された筒状の分離膜９２と含む。筐体８８は、混合ガス２２を取り入れる入口９０と、入口９０と対向して配置され、再送ガス冷媒を排出する出口９６と、非凝縮性ガスを大気に放出する放出口９４とを含む。分離膜９２の一端は、筐体８８の入口９０に接続され、分離膜９２の他端は、筐体８８の出口９６に接続されている。混合ガス２２は、入口９０から分離膜９２の内部に入り、出口９６に向かって進み、その間に、空気を主成分とする非凝縮性ガスが、分離膜９２を透過して、分離膜９２の外に出ていき、やがて、筐体８８の放出口９４から大気に放たれる。また、混合ガス２２に比べて非凝縮性ガスが低減した再送ガス冷媒は、筐体８８の出口９６から再送配管５８内に排出される。 Next, the gas separation module 68 will be described. As shown in FIG. 1, the gas separation module 68 includes a cylindrical housing 88 and a tubular separation membrane 92 arranged in the housing 88. The housing 88 includes an inlet 90 for taking in the mixed gas 22, an outlet 96 arranged facing the inlet 90 and discharging the retransmission gas refrigerant, and a discharge port 94 for discharging the non-condensable gas to the atmosphere. One end of the separation membrane 92 is connected to the inlet 90 of the housing 88, and the other end of the separation membrane 92 is connected to the outlet 96 of the housing 88. The mixed gas 22 enters the inside of the separation membrane 92 from the inlet 90 and proceeds toward the outlet 96, during which the non-condensable gas containing air as a main component permeates the separation membrane 92 and forms the separation membrane 92. It goes out and is eventually released into the atmosphere from the discharge port 94 of the housing 88. Further, the retransmission gas refrigerant having a reduced amount of non-condensable gas as compared with the mixed gas 22 is discharged from the outlet 96 of the housing 88 into the retransmission pipe 58.

分離膜９２としては、例えば、無機系材料により構成された膜（以下、無機系分離膜と言う）または有機系材料により構成された膜（以下、有機系分離膜と言う）を使用することができる。図５は、無機系分離膜によるガス分離の様子を模式的に示すであり、図６は、有機系分離膜によるガス分離の様子を模式的に示すである。 As the separation membrane 92, for example, a membrane made of an inorganic material (hereinafter referred to as an inorganic separation membrane) or a membrane made of an organic material (hereinafter referred to as an organic separation membrane) can be used. can. FIG. 5 schematically shows the state of gas separation by the inorganic separation membrane, and FIG. 6 schematically shows the state of gas separation by the organic separation membrane.

図５に示すように、無機系分離膜は、分子径の差異を利用してガス分離を行うものであり、ガス冷媒２４に比べて分子径が小さい空気２６や水２８が分離膜９２の孔を通って膜の外に出ていく一方で、ガス冷媒２４は膜の内側に残る。無機系分離膜の材料としては、例えばセラミック、ゼオライト等を使用することができる。 As shown in FIG. 5, the inorganic separation membrane performs gas separation by utilizing the difference in molecular diameter, and air 26 and water 28 having a smaller molecular diameter than the gas refrigerant 24 are holes in the separation membrane 92. The gas refrigerant 24 remains inside the membrane while exiting the membrane through the membrane. As the material of the inorganic separation membrane, for example, ceramic, zeolite or the like can be used.

図６に示すように、有機系分離膜は、膜における分子の透過速度差を利用してガス分離を行うものであり、ガス冷媒２４に比べて透過速度が速い空気２６や水２８が分離膜９２を透過して膜の外に出ていく一方で、ガス冷媒２４は膜の内側に残る。有機系分離膜の材料としては、例えばポリイミド樹脂等を使用することができる。 As shown in FIG. 6, the organic separation membrane uses the difference in permeation rate of molecules in the membrane to separate gas, and air 26 and water 28, which have a higher permeation rate than the gas refrigerant 24, are separation membranes. While permeating 92 and exiting the membrane, the gas refrigerant 24 remains inside the membrane. As the material of the organic separation membrane, for example, a polyimide resin or the like can be used.

次に、冷媒回収システム１０を用いた具体的な冷媒回収方法について説明する。図７は、冷媒回収システム１０を用いた具体的な冷媒回収方法を示すフローチャートである。図７において、Ｓ１００～Ｓ１０４、Ｓ１２６及びＳ１２８が作業者が行うステップであり、その他のステップは冷媒回収システム１０により自動的に行われるステップである。 Next, a specific refrigerant recovery method using the refrigerant recovery system 10 will be described. FIG. 7 is a flowchart showing a specific refrigerant recovery method using the refrigerant recovery system 10. In FIG. 7, S100 to S104, S126 and S128 are steps performed by the operator, and the other steps are steps automatically performed by the refrigerant recovery system 10.

まず、Ｓ１００で、作業者は、冷媒回収装置１４、回収ボンベ１６、および分離装置１８を準備する。そして、Ｓ１０２で、作業者は、空調装置１２の電源を遮断した後、図１に示すように、空調装置１２、冷媒回収装置１４、回収ボンベ１６、および分離装置１８を互いに接続する。次に、Ｓ１０３で、作業者は、分離装置１８の電源をオンにする。この後、作業者は、回収冷媒情報１１０（図２参照）と、気化促進モードに関する圧力閾値１２０および継続時間１２２（図４参照）とを入力部１００から入力する。分離装置１８の電源がオンにされると、三方弁制御部８０は、三方弁４０を第１ポート４１と第２ポート４２が連通する通常モードに制御する。そして、Ｓ１０４で、作業者は、冷媒回収装置１４を駆動させる。これにより、空調装置１２からの冷媒回収が開始される。 First, in S100, the operator prepares the refrigerant recovery device 14, the recovery cylinder 16, and the separation device 18. Then, in S102, after turning off the power of the air conditioner 12, the operator connects the air conditioner 12, the refrigerant recovery device 14, the recovery cylinder 16, and the separation device 18 to each other as shown in FIG. Next, in S103, the operator turns on the power of the separation device 18. After that, the operator inputs the recovered refrigerant information 110 (see FIG. 2), the pressure threshold value 120 and the duration 122 (see FIG. 4) regarding the vaporization promotion mode from the input unit 100. When the power of the separation device 18 is turned on, the three-way valve control unit 80 controls the three-way valve 40 to the normal mode in which the first port 41 and the second port 42 communicate with each other. Then, in S104, the operator drives the refrigerant recovery device 14. As a result, the refrigerant recovery from the air conditioner 12 is started.

Ｓ１０６～Ｓ１２２は、冷媒回収システム１０による自動制御である。Ｓ１０６で、発送制御部７６の参照圧力取得部１０４は、回収冷媒情報１１０が示す回収冷媒の圧力特性（図３参照）に基づいて、温度検出器６２の検出温度ＤＴ（回収ボンベ１６内の温度）における回収冷媒の飽和蒸気圧を参照圧力ＲＰとして取得する。そして、発送制御部７６の判定部１０８は、参照圧力ＲＰよりも、圧力検出器６１の検出圧力ＤＰ（回収ボンベ内の圧力）が高いかを確認する。なお、図７のＳ１０６のように、判定部１０８は、参照圧力ＲＰに予め定められた圧力αを加算した圧力（ＲＰ＋α、以下、基準圧力と言う）よりも、検出圧力ＤＰ（回収ボンベ内の圧力）が高いかを確認してもよい。 S106 to S122 are automatic controls by the refrigerant recovery system 10. In S106, the reference pressure acquisition unit 104 of the delivery control unit 76 has a detection temperature DT (temperature in the recovery cylinder 16) of the temperature detector 62 based on the pressure characteristic of the recovery refrigerant (see FIG. 3) indicated by the recovery refrigerant information 110. ), The saturated vapor pressure of the recovered vapor pressure is obtained as the reference pressure RP. Then, the determination unit 108 of the delivery control unit 76 confirms whether the detection pressure DP (pressure in the recovery cylinder) of the pressure detector 61 is higher than the reference pressure RP. As shown in S106 of FIG. 7, the determination unit 108 has a detection pressure DP (in the recovery cylinder) rather than a pressure (RP + α, hereinafter referred to as a reference pressure) obtained by adding a predetermined pressure α to the reference pressure RP. You may check if the pressure) is high.

判定部１０８は、検出圧力ＤＰが基準圧力（ＲＰ＋α）以下の場合（Ｓ１０６：Ｎｏ）には、回収ボンベ１６内の非凝縮性ガスの除去は不要と判断して、冷媒回収を継続する（Ｓ１０８）。 When the detection pressure DP is equal to or less than the reference pressure (RP + α) (S106: No), the determination unit 108 determines that it is not necessary to remove the non-condensable gas in the recovery cylinder 16 and continues the refrigerant recovery (S108). ).

一方、判定部１０８は、検出圧力ＤＰが基準圧力（ＲＰ＋α）より高い場合（Ｓ１０６：Ｙｅｓ）には、回収ボンベ１６内の非凝縮性ガスの除去が必要と判断して、除去信号をＬｏｗからＨｉｇｈにして、Ｓ１１０に進む。なお、このように基準圧力を用いて判定を行えば、回収ボンベ１６内に非凝縮性ガスがある程度たまった後、非凝縮性ガスの除去を開始することができる。 On the other hand, when the detected pressure DP is higher than the reference pressure (RP + α) (S106: Yes), the determination unit 108 determines that it is necessary to remove the non-condensable gas in the recovery cylinder 16, and sends a removal signal from Low. Set to High and proceed to S110. If the determination is made using the reference pressure in this way, the removal of the non-condensable gas can be started after the non-condensable gas has accumulated to some extent in the recovery cylinder 16.

Ｓ１１０で、三方弁制御部８０は、除去信号がＬｏｗからＨｉｇｈになったことを受けて、第１三方弁制御を実行する。図８は、第１三方弁制御を示すフローチャートである。図８のＳ２００で、三方弁制御部８０の判定部１１８は、冷媒回収装置１４の圧力検出器３７の検出圧力ＤＰＳ（冷媒回路３０の圧力）が、記憶部１０２にある圧力閾値１２０以下かを確認する。なお、圧力閾値１２０は、例えば０．１ＭＰａ程度である。 In S110, the three-way valve control unit 80 executes the first three-way valve control in response to the fact that the removal signal changes from Low to High. FIG. 8 is a flowchart showing the first three-way valve control. In S200 of FIG. 8, the determination unit 118 of the three-way valve control unit 80 determines whether the detection pressure DPS (pressure of the refrigerant circuit 30) of the pressure detector 37 of the refrigerant recovery device 14 is equal to or less than the pressure threshold value 120 in the storage unit 102. confirm. The pressure threshold value 120 is, for example, about 0.1 MPa.

Ｓ２００がＮｏの場合には、判定部１１８は、空調装置１２の冷媒回路３０の冷媒が低温凝縮する可能性が低いと推定し、三方弁４０を第２ポート４２と第３ポート４３が連通する循環モードに制御し（Ｓ２０６）、気化促進フラグをオフにして（Ｓ２０８）、第１三方弁制御を終了する。 When S200 is No, the determination unit 118 estimates that the refrigerant in the refrigerant circuit 30 of the air conditioner 12 is unlikely to condense at a low temperature, and the third port 42 and the third port 43 communicate with each other through the three-way valve 40. The circulation mode is controlled (S206), the vaporization promotion flag is turned off (S208), and the first three-way valve control is terminated.

一方、Ｓ２００がＹｅｓの場合には、判定部１１８は、空調装置１２の冷媒回路３０の冷媒が低温凝縮する可能性が高いと推定し、三方弁４０を第１ポート４１と第３ポート４３が連通する気化促進モードに制御し（Ｓ２０２）、気化促進フラグをオンにして（Ｓ２０４）、第１三方弁制御を終了する。 On the other hand, when S200 is Yes, the determination unit 118 estimates that the refrigerant in the refrigerant circuit 30 of the air conditioner 12 is likely to condense at a low temperature, and the three-way valve 40 has the first port 41 and the third port 43. The communication promotion mode is controlled (S202), the vaporization promotion flag is turned on (S204), and the first three-way valve control is terminated.

図７に戻り、Ｓ１１０の次は、Ｓ１１２で、発送制御部７６の判定部１０８は、発送配管５６上の制御弁６４を開く。なお、除去信号をＬｏｗからＨｉｇｈにするタイミングと、Ｓ１１０（第１三方弁制御）の実行タイミングと、Ｓ１１２（制御弁６４を開く動作）の実行タイミングとは、ほぼ同時である。また、制御弁６４を開く前に、減圧弁制御部１０６により減圧弁６６を調整しておく。制御弁６４を開くことにより、回収ボンベ１６内の混合ガス２２がガス分離モジュール６８に送られる。 Returning to FIG. 7, in S112 after S110, the determination unit 108 of the delivery control unit 76 opens the control valve 64 on the delivery pipe 56. The timing of changing the removal signal from Low to High, the execution timing of S110 (first three-way valve control), and the execution timing of S112 (operation of opening the control valve 64) are almost the same. Further, before opening the control valve 64, the pressure reducing valve 66 is adjusted by the pressure reducing valve control unit 106. By opening the control valve 64, the mixed gas 22 in the recovery cylinder 16 is sent to the gas separation module 68.

循環モードの場合には、分離装置１８、冷媒回収装置１４、および回収ボンベ１６の循環ループが形成されて、回収ボンベ１６内の混合ガス２２は、繰り返しガス分離モジュール６８に送り込まれ、非凝縮性ガスは大気に開放され、再送ガス冷媒は、冷媒回収装置１４の前の前配管５２に送り込まれて、冷媒回収装置１４を通過し、液化された状態で回収ボンベ１６に戻る。これにより、回収ボンベ１６内の非凝縮性ガスは徐々に除去され、回収ボンベ１６内の圧力は低下する。 In the circulation mode, a circulation loop of the separation device 18, the refrigerant recovery device 14, and the recovery cylinder 16 is formed, and the mixed gas 22 in the recovery cylinder 16 is repeatedly sent to the gas separation module 68 to be non-condensable. The gas is released to the atmosphere, and the retransmitted gas refrigerant is sent to the front pipe 52 in front of the refrigerant recovery device 14, passes through the refrigerant recovery device 14, and returns to the recovery cylinder 16 in a liquefied state. As a result, the non-condensable gas in the recovery cylinder 16 is gradually removed, and the pressure in the recovery cylinder 16 decreases.

気化促進モードの場合には、回収ボンベ１６内の混合ガス２２の一部である再送ガス冷媒が、空調装置１２の冷媒回路３０内に送り込まれ、冷媒回路３０内の冷媒の温度を上昇させる。これにより、冷媒の気化が促進され、冷媒回収を再開した際に、冷媒回収速度を向上させることができる。 In the case of the vaporization promotion mode, the retransmission gas refrigerant, which is a part of the mixed gas 22 in the recovery cylinder 16, is sent into the refrigerant circuit 30 of the air conditioner 12, and raises the temperature of the refrigerant in the refrigerant circuit 30. As a result, the vaporization of the refrigerant is promoted, and the refrigerant recovery speed can be improved when the refrigerant recovery is restarted.

再送制御部７８は、循環モードおよび気化促進モードにおいて圧力調整器７２を制御して、圧力調整器７２の下流側（ガス流出口７４側）の再送配管５８内の圧力を調整する。 The retransmission control unit 78 controls the pressure regulator 72 in the circulation mode and the vaporization promotion mode to adjust the pressure in the retransmission pipe 58 on the downstream side (gas outlet 74 side) of the pressure regulator 72.

Ｓ１１４で、発送制御部７６の判定部１０８は、圧力検出器６１の検出圧力ＤＰ（回収ボンベ１６内の圧力）が、参照圧力ＲＰ以下になったかを確認する。Ｓ１１４がＮｏの場合には、非凝縮性ガスの除去を継続し（Ｓ１１６）、Ｓ１１８に進む。 In S114, the determination unit 108 of the shipping control unit 76 confirms whether the detection pressure DP (pressure in the recovery cylinder 16) of the pressure detector 61 is equal to or less than the reference pressure RP. If S114 is No, the removal of the non-condensable gas is continued (S116), and the process proceeds to S118.

Ｓ１１８で、三方弁制御部８０は、第２三方弁制御を実行する。図９は、第２三方弁制御を示すフローチャートである。図９のＳ３００で、三方弁制御部８０の判定部１１８は、気化促進フラグがオンであるかを確認する。Ｓ３００がＮｏの場合（循環モードの場合）は、第２三方弁制御を終了する。一方、Ｓ３００がＹｅｓの場合（気化促進モードの場合）にはＳ３０２に進む。 In S118, the three-way valve control unit 80 executes the second three-way valve control. FIG. 9 is a flowchart showing the second three-way valve control. In S300 of FIG. 9, the determination unit 118 of the three-way valve control unit 80 confirms whether the vaporization promotion flag is on. When S300 is No (in the case of the circulation mode), the second three-way valve control is terminated. On the other hand, if S300 is Yes (in the case of vaporization promotion mode), the process proceeds to S302.

Ｓ３０２で、判定部１１８は、気化促進モードに遷移させてから、記憶部１０２にある継続時間１２２（図４参照）だけ時間が経過したかを確認する。Ｓ３０２がＮｏの場合には、判定部１１８は、気化促進モードを引き続き継続させる必要があると判断し、第２三方弁制御を終了する。一方、Ｓ３０２がＹｅｓの場合には、判定部１１８は、気化促進モードを終了してよいと判断し、三方弁４０を第２ポート４２と第３ポート４３が連通する循環モードに制御し（Ｓ３０４）、気化促進フラグをオフ（Ｓ３０６）にして、第２三方弁制御を終了する。 In S302, the determination unit 118 confirms whether or not the duration 122 (see FIG. 4) in the storage unit 102 has elapsed since the transition to the vaporization promotion mode. If S302 is No, the determination unit 118 determines that it is necessary to continue the vaporization promotion mode, and ends the second three-way valve control. On the other hand, when S302 is Yes, the determination unit 118 determines that the vaporization promotion mode may be terminated, and controls the three-way valve 40 to the circulation mode in which the second port 42 and the third port 43 communicate (S304). ), The vaporization promotion flag is turned off (S306), and the second three-way valve control is terminated.

図７に戻り、Ｓ１１４で、発送制御部７６の判定部１０８は、圧力検出器６１の検出圧力ＤＰ（回収ボンベ１６内の圧力）が、参照圧力ＲＰ以下になった場合（Ｓ１１４：Ｙｅｓ）には、回収ボンベ１６内の非凝縮性ガスの除去が完了したと判断して、Ｓ１２０に進む。 Returning to FIG. 7, in S114, when the detection pressure DP (pressure in the recovery cylinder 16) of the pressure detector 61 becomes equal to or less than the reference pressure RP in the determination unit 108 of the shipping control unit 76 (S114: Yes). Determines that the removal of the non-condensable gas in the recovery cylinder 16 is completed, and proceeds to S120.

Ｓ１２０で、発送制御部７６の判定部１０８は、発送配管５６上の制御弁６４を閉じ、除去信号をＨｉｇｈからＬｏｗにする。三方弁制御部８０の判定部１１８は、除去信号がＨｉｇｈからＬｏｗになったことを受けて、三方弁４０を第１ポート４１と第２ポート４２が連通する通常モードに制御する。また、発送制御部７６の減圧弁制御部１０６は、減圧弁６６の制御を終了し、再送制御部７８は、圧力調整器７２の制御を終了する。 In S120, the determination unit 108 of the delivery control unit 76 closes the control valve 64 on the delivery pipe 56 and changes the removal signal from High to Low. The determination unit 118 of the three-way valve control unit 80 controls the three-way valve 40 to a normal mode in which the first port 41 and the second port 42 communicate with each other in response to the removal signal changing from High to Low. Further, the pressure reducing valve control unit 106 of the delivery control unit 76 ends the control of the pressure reducing valve 66, and the retransmission control unit 78 ends the control of the pressure regulator 72.

次に、Ｓ１２２で、冷媒回収装置１４は、圧力検出器３７の検出圧力ＤＰＳ（冷媒回路３０の圧力）が負圧になったかを確認する。Ｓ１２２がＮｏの場合には、冷媒回収装置１４は冷媒回収を継続し（Ｓ１２４）、Ｓ１２２がＹｅｓの場合には、冷媒回収装置１４は、ランプ、音等により冷媒回収が終了したことを作業者に伝える。 Next, in S122, the refrigerant recovery device 14 confirms whether the detection pressure DPS (pressure of the refrigerant circuit 30) of the pressure detector 37 has become a negative pressure. When S122 is No, the refrigerant recovery device 14 continues the refrigerant recovery (S124), and when S122 is Yes, the refrigerant recovery device 14 indicates that the refrigerant recovery has been completed by a lamp, sound, or the like. Tell to.

Ｓ１２６で、作業者は、冷媒回収装置１４を停止する。そして、Ｓ１２８で、作業者は、分離装置１８の電源をオフにする。以上が冷媒回収のフローである。 At S126, the operator stops the refrigerant recovery device 14. Then, in S128, the operator turns off the power of the separating device 18. The above is the flow of refrigerant recovery.

次に、以上説明した冷媒回収システム１０の作用効果について説明する。冷媒回収システム１０によれば、回収ボンベ１６の内部の混合ガス２２がガス分離モジュール６８に送られることで、混合ガス２２から非凝縮性ガスが分離されて大気に排出されると共に、混合ガス２２に比べて非凝縮性ガスが低減された再送ガス冷媒が、ガス分離モジュール６８の出口９６から排出されて、空調装置１２の冷媒回路３０と冷媒回収装置１４の間の配管内に送られる。また、再送ガス冷媒は、再度、冷媒回収装置１４を通過し、液化された状態で回収ボンベ１６に戻ることになる。 Next, the operation and effect of the refrigerant recovery system 10 described above will be described. According to the refrigerant recovery system 10, the mixed gas 22 inside the recovery cylinder 16 is sent to the gas separation module 68, so that the non-condensable gas is separated from the mixed gas 22 and discharged to the atmosphere, and the mixed gas 22 is discharged. The retransmitted gas refrigerant having a reduced amount of non-condensable gas is discharged from the outlet 96 of the gas separation module 68 and sent into the pipe between the refrigerant circuit 30 of the air conditioner 12 and the refrigerant recovery device 14. Further, the retransmitted gas refrigerant passes through the refrigerant recovery device 14 again and returns to the recovery cylinder 16 in a liquefied state.

このように、回収ボンベ１６、冷媒回収装置１４及び空調装置１２の接続を維持したまま、回収ボンベ１６内の非凝縮性ガスを低減することができる。回収ボンベ１６の内圧上昇を抑制することができ、回収ボンベ１６への冷媒回収速度を向上することができると共に、回収ボンベ１６の冷媒充填量を増やすことができる。また、再送ガス冷媒は、液化されて（体積が減少した状態で）回収ボンベ１６に戻るので、回収ボンベ１６の冷媒充填量をさらに増加させることができる。なお、回収ボンベ１６内の混合ガス２２をガス分離モジュール６８に送るために、回収ボンベ１６、ガス分離モジュール６８、冷媒回収装置１４の順で配置される点に重要な意義がある。 In this way, the non-condensable gas in the recovery cylinder 16 can be reduced while maintaining the connection between the recovery cylinder 16, the refrigerant recovery device 14, and the air conditioner 12. It is possible to suppress an increase in the internal pressure of the recovery cylinder 16, improve the speed of recovering the refrigerant to the recovery cylinder 16, and increase the amount of refrigerant charged in the recovery cylinder 16. Further, since the retransmission gas refrigerant is liquefied and returned to the recovery cylinder 16 (in a state where the volume is reduced), the refrigerant filling amount of the recovery cylinder 16 can be further increased. It is important that the recovery cylinder 16, the gas separation module 68, and the refrigerant recovery device 14 are arranged in this order in order to send the mixed gas 22 in the recovery cylinder 16 to the gas separation module 68.

また、ガス分離モジュール６８は、回収ボンベ１６の上部に取り付けられている。そのため、液冷媒や混入した水などの液成分は、回収ボンベ１６内の底部に滞留し、ガス分離モジュール６８の分離膜９２に液冷媒や多量の水が混入することがなく、分離膜９２のガス分離効果の低下を抑制することができる。また、空調用冷媒は、冷媒回収装置１４で断熱圧縮され液化した状態で回収ボンベ１６に充填される。そのため、回収ボンベ１６内の空間部の体積分に飽和蒸気圧分のみの冷媒が気化しているだけで、ほとんどの冷媒は回収ボンベ１６内では液化している。気化している冷媒（ガス冷媒）の割合が低いため、ガス分離モジュール６８に送られるガス冷媒の量を少なくでき、ガス分離モジュール６８における冷媒漏洩リスクを低減することもできる。 Further, the gas separation module 68 is attached to the upper part of the recovery cylinder 16. Therefore, the liquid components such as the liquid refrigerant and the mixed water stay at the bottom of the recovery cylinder 16, and the liquid refrigerant and a large amount of water do not mix in the separation membrane 92 of the gas separation module 68, and the separation membrane 92 It is possible to suppress a decrease in the gas separation effect. Further, the air-conditioning refrigerant is adiabatically compressed by the refrigerant recovery device 14 and filled in the recovery cylinder 16 in a liquefied state. Therefore, only the refrigerant having only the saturated vapor pressure is vaporized in the volume of the space in the recovery cylinder 16, and most of the refrigerant is liquefied in the recovery cylinder 16. Since the proportion of the vaporized refrigerant (gas refrigerant) is low, the amount of the gas refrigerant sent to the gas separation module 68 can be reduced, and the risk of refrigerant leakage in the gas separation module 68 can also be reduced.

また、分離装置１８、冷媒回収装置１４、及び回収ボンベ１６の循環ループが形成され、ガス分離モジュール６８により、繰り返し非凝縮性ガスの分離が行われるので、効果的に、回収ボンベ１６内の非凝縮性ガスの除去が実現される。すなわち、混合ガス２２が１回のみガス分離モジュール６８を通過するような構成に比べて、分離効率を高くすることができる。 Further, since the circulation loop of the separation device 18, the refrigerant recovery device 14, and the recovery cylinder 16 is formed, and the non-condensable gas is repeatedly separated by the gas separation module 68, the non-condensable gas in the recovery cylinder 16 is effectively separated. Removal of condensable gas is realized. That is, the separation efficiency can be increased as compared with the configuration in which the mixed gas 22 passes through the gas separation module 68 only once.

また、回収ボンベ１６内に非凝縮性ガスが混入している場合に限って、制御弁６４を開状態にしてガス分離モジュール６８で非凝縮性ガスを除去するので、回収ボンベ１６内に非凝縮性ガスが無い又は少ない場合の不必要なガス分離モジュール６８の使用を回避することができる。 Further, only when the non-condensable gas is mixed in the recovery cylinder 16, the control valve 64 is opened and the non-condensable gas is removed by the gas separation module 68, so that the non-condensable gas is removed in the recovery cylinder 16. It is possible to avoid unnecessary use of the gas separation module 68 when there is no or little sex gas.

また、分離装置１８の記憶部１０２には複数種類の冷媒の圧力特性１１２が記憶されているので、異なる種類の冷媒の回収において、共通の分離装置１８を用いることができる。 Further, since the pressure characteristics 112 of a plurality of types of refrigerants are stored in the storage unit 102 of the separation device 18, a common separation device 18 can be used for recovering different types of refrigerants.

また、ガス分離モジュール６８を使用する場合（制御弁６４が開状態の場合）であって、冷媒回路３０の圧力が予め定められた圧力より高い場合には、再送ガス冷媒を、再送配管５８から冷媒回収装置１４に的確に送り込むことができる。また、ガス分離モジュール６８を使用する場合（制御弁６４が開状態の場合）であって、冷媒回路３０の圧力が予め定められた圧力以下の場合には、冷媒回収装置１４で断熱圧縮され、冷媒回収装置１４への流入時よりも温度が高くなった冷媒が入れられた回収ボンベ１６内のガス冷媒の一部である再送ガス冷媒（冷媒回路３０内よりも温度が高い）を、冷媒回路３０に送り込むことができる。これにより、冷媒回路３０内の冷媒の温度を上昇させ、冷媒のガス化を促進させることができ、冷媒回収を再開した際に、冷媒回収速度を向上させることができる。 Further, when the gas separation module 68 is used (when the control valve 64 is in the open state) and the pressure of the refrigerant circuit 30 is higher than the predetermined pressure, the retransmission gas refrigerant is transferred from the retransmission pipe 58. It can be accurately sent to the refrigerant recovery device 14. Further, when the gas separation module 68 is used (when the control valve 64 is in the open state) and the pressure of the refrigerant circuit 30 is equal to or lower than a predetermined pressure, the refrigerant recovery device 14 adiabatically compresses the gas. The retransmitted gas refrigerant (higher in temperature than in the refrigerant circuit 30), which is a part of the gas refrigerant in the recovery cylinder 16 containing the refrigerant whose temperature is higher than that at the time of inflow into the refrigerant recovery device 14, is used in the refrigerant circuit. It can be sent to 30. As a result, the temperature of the refrigerant in the refrigerant circuit 30 can be raised to promote gasification of the refrigerant, and the refrigerant recovery speed can be improved when the refrigerant recovery is restarted.

次に、本発明の別の実施形態に係る冷媒回収システムについて説明する。図１０は、本発明の別の実施形態に係る冷媒回収システム１０Ａの概略図である。冷媒回収システム１０Ａは、以上で説明した冷媒回収システム１０に対して、三方弁４０と三方弁制御部８０が省かれ、再送配管５８上に制御弁１５０が追加されている。分離装置１８Ａのガス流出口７４は、空調装置１２の冷媒回路３０と冷媒回収装置１４の間の配管に接続されて、接続部１５２が形成されている。 Next, the refrigerant recovery system according to another embodiment of the present invention will be described. FIG. 10 is a schematic view of the refrigerant recovery system 10A according to another embodiment of the present invention. In the refrigerant recovery system 10A, the three-way valve 40 and the three-way valve control unit 80 are omitted from the refrigerant recovery system 10 described above, and the control valve 150 is added on the retransmission pipe 58. The gas outlet 74 of the separation device 18A is connected to a pipe between the refrigerant circuit 30 of the air conditioner 12 and the refrigerant recovery device 14, and a connection portion 152 is formed.

発送制御部７６による各部の制御と除去信号は、以上で説明した冷媒回収システム１０と同じである。再送制御部７８には、三方弁信号に代えて除去信号が入力されており、再送制御部７８は、除去信号のＬｏｗ／Ｈｉｇｈに基づいて、再送配管５８の制御弁１５０を制御する。具体的には、除去信号がＬｏｗ（発送配管５６上の制御弁６４が閉状態）の場合には、再送配管５８上の制御弁１５０も閉状態とし、除去信号がＨｉｇｈ（発送配管５６上の制御弁６４が開状態）の場合には、再送配管５８上の制御弁１５０も開状態とする。また、再送制御部７８は、除去信号がＨｉｇｈの場合に、検出圧力ＤＰＲ、ＤＰＳに基づいて、冷媒回収装置１４の入口３６における圧力よりも、圧力調整器７２の下流側（ガス流出口７４側）の再送配管５８内の圧力が高くなるように圧力調整器７２を制御する。 The control and removal signals of each unit by the delivery control unit 76 are the same as those of the refrigerant recovery system 10 described above. A removal signal is input to the retransmission control unit 78 instead of the three-way valve signal, and the retransmission control unit 78 controls the control valve 150 of the retransmission pipe 58 based on the Low / High of the removal signal. Specifically, when the removal signal is Low (the control valve 64 on the shipping pipe 56 is closed), the control valve 150 on the retransmission pipe 58 is also closed and the removal signal is High (the control valve 64 on the shipping pipe 56 is closed). When the control valve 64 is in the open state), the control valve 150 on the retransmission pipe 58 is also in the open state. Further, when the removal signal is High, the retransmission control unit 78 is located on the downstream side of the pressure regulator 72 (gas outlet 74 side) with respect to the pressure at the inlet 36 of the refrigerant recovery device 14 based on the detected pressures DPR and DPS. ), The pressure regulator 72 is controlled so that the pressure in the retransmission pipe 58 becomes high.

この実施形態によれば、制御弁６４、１５０を閉状態とすることで、空調装置１２から回収ボンベ１６への一般的な冷媒回収を行うことができる。また、制御弁６４、１５０を開状態とすることで、分離装置１８Ａ、冷媒回収装置１４、及び回収ボンベ１６の循環ループが形成されるので、回収ボンベ１６内から非凝縮性ガスを除去することができる。三方弁と三方弁制御部が省かれているので、冷媒回収システム１０Ａの構成を簡素にすることができる。 According to this embodiment, by closing the control valves 64 and 150, it is possible to recover the general refrigerant from the air conditioner 12 to the recovery cylinder 16. Further, by opening the control valves 64 and 150, a circulation loop of the separation device 18A, the refrigerant recovery device 14, and the recovery cylinder 16 is formed, so that the non-condensable gas is removed from the recovery cylinder 16. Can be done. Since the three-way valve and the three-way valve control unit are omitted, the configuration of the refrigerant recovery system 10A can be simplified.

次に、変形例について説明する。図７に示した冷媒回収方法では、冷媒回収過程において１回のみ循環モードにしたが、複数回、循環モードするとしてもよい。すなわち、循環モードにした後、通常モードにして冷媒回収を再開した際に、再び回収ボンベ１６内の圧力が高くなった際には、再度、循環モードにするとしてもよい。 Next, a modification will be described. In the refrigerant recovery method shown in FIG. 7, the circulation mode is set only once in the refrigerant recovery process, but the circulation mode may be set a plurality of times. That is, when the pressure in the recovery cylinder 16 becomes high again when the refrigerant recovery is restarted in the normal mode after the circulation mode is set, the circulation mode may be set again.

また、図７に示した冷媒回収方法では、気化促進モードを実行したが、気化促進モードを省いて、通常モードと循環モードのみを実行するとしてもよい。このようにすれば、冷媒回収方法が簡素になる。 Further, in the refrigerant recovery method shown in FIG. 7, the vaporization promotion mode is executed, but the vaporization promotion mode may be omitted and only the normal mode and the circulation mode may be executed. In this way, the refrigerant recovery method is simplified.

また、以上説明した各実施形態では、各制御部が各機器を制御した。しかし、作業者が、各検出器の検出値を目視等により確認して、手動により、制御弁６４、１５０、減圧弁６６、三方弁４０、および圧力調整器７２の少なくとも１つを操作するとしてもよい。 Further, in each of the above-described embodiments, each control unit controls each device. However, assuming that the operator visually confirms the detection value of each detector and manually operates at least one of the control valves 64 and 150, the pressure reducing valve 66, the three-way valve 40, and the pressure regulator 72. May be good.

また、以上説明した各実施形態では、回収ボンベ１６内の圧力および温度を、分離装置１８の発送配管５６に配置された圧力検出器６１および温度検出器６２で検出した。しかし、冷媒回収装置１４の出口３８における圧力および温度を、回収ボンベ１６内の圧力および温度として検出し、発送制御部７６に入力して制御を行ってもよい。また、回収ボンベ１６に備え付けた圧力検出器および温度検出器により検出した圧力および温度を、回収ボンベ１６内の圧力および温度として、発送制御部７６に入力して制御を行ってもよい。 Further, in each of the above-described embodiments, the pressure and temperature in the recovery cylinder 16 are detected by the pressure detector 61 and the temperature detector 62 arranged in the shipping pipe 56 of the separation device 18. However, the pressure and temperature at the outlet 38 of the refrigerant recovery device 14 may be detected as the pressure and temperature in the recovery cylinder 16 and input to the delivery control unit 76 for control. Further, the pressure and temperature detected by the pressure detector and the temperature detector provided in the recovery cylinder 16 may be input to the shipping control unit 76 as the pressure and temperature in the recovery cylinder 16 for control.

１０，１０Ａ 冷媒回収システム、１２ 空調装置（冷凍空調機器）、１４ 冷媒回収装置、１６ 回収ボンベ、１８，１８Ａ 分離装置、２０ 液冷媒、２２ 混合ガス（ガス成分）、２４ ガス冷媒、２６ 空気、２８ 水、３０ 冷媒回路、３２ アキュムレータ、３４ サービスポート、３６ 入口、３７ 圧力検出器、３８ 出口、４０ 三方弁、４１ 第１ポート、４２ 第２ポート、４３ 第３ポート、４６ 液出入口、４８ ガス出入口、５０ 接続配管、５２ 前配管、５４ 後配管、５６ 発送配管、５８ 再送配管、６０ ガス流入口、６１ 圧力検出器、６２ 温度検出器、６４ 制御弁、６６ 減圧弁、６８ ガス分離モジュール、７０ 圧力検出器、７２ 圧力調整器、７４ ガス流出口、７６ 発送制御部、７８ 再送制御部、８０ 三方弁制御部、８８ 筐体、９０ 入口、９２ 分離膜、９４ 放出口、９６ 出口、１００ 入力部、１０２ 記憶部、１０４ 参照圧力取得部、１０６ 減圧弁制御部、１０８ 判定部、１１０ 回収冷媒情報、１１２ 圧力特性、１１８ 判定部、１２０ 圧力閾値、１２２ 継続時間、１５０ 制御弁、１５２ 接続部。 10,10A refrigerant recovery system, 12 air conditioner (refrigerating and air conditioning equipment), 14 refrigerant recovery device, 16 recovery bomb, 18,18A separator, 20 liquid refrigerant, 22 mixed gas (gas component), 24 gas refrigerant, 26 air, 28 water, 30 refrigerant circuit, 32 accumulator, 34 service port, 36 inlet, 37 pressure detector, 38 outlet, 40 three-way valve, 41 1st port, 42 2nd port, 43 3rd port, 46 liquid inlet / outlet, 48 gas Doorway, 50 connection pipe, 52 front pipe, 54 rear pipe, 56 shipping pipe, 58 retransmission pipe, 60 gas inlet, 61 pressure detector, 62 temperature detector, 64 control valve, 66 pressure reducing valve, 68 gas separation module, 70 pressure detector, 72 pressure regulator, 74 gas outlet, 76 delivery control unit, 78 retransmission control unit, 80 three-way valve control unit, 88 housing, 90 inlet, 92 separation membrane, 94 outlet, 96 outlet, 100 Input unit, 102 storage unit, 104 reference pressure acquisition unit, 106 pressure reducing valve control unit, 108 judgment unit, 110 recovery gas information, 112 pressure characteristics, 118 judgment unit, 120 pressure threshold, 122 duration, 150 control valve, 152 connection Department.

Claims (10)

冷凍空調機器の冷媒回路から空調用冷媒を回収する冷媒回収システムであって、
前記空調用冷媒に圧縮凝縮を行って圧縮凝縮冷媒を生成する冷媒回収装置と、
前記冷媒回収装置が生成した前記圧縮凝縮冷媒を回収する回収ボンベと、
前記圧縮凝縮冷媒を回収した前記回収ボンベの内部から前記空調用冷媒をガス成分として非凝縮性ガスと分離させるガス分離モジュールと、
前記ガス分離モジュールが分離した前記空調用冷媒のガス成分を前記冷媒回路と前記冷媒回収装置の間の配管に再送させる再送配管と、
を備え、
前記冷媒回路の圧力が予め定められた圧力以下の場合に、前記ガス分離モジュールが分離した前記空調用冷媒のガス成分を、前記冷媒回路に送るように構成される、
ことを特徴とする冷媒回収システム。 A refrigerant recovery system that recovers air-conditioning refrigerant from the refrigerant circuit of refrigerating and air-conditioning equipment.
A refrigerant recovery device that compresses and condenses the air-conditioning refrigerant to generate a compressed and condensed refrigerant.
A recovery cylinder that recovers the compressed and condensed refrigerant generated by the refrigerant recovery device,
A gas separation module that separates the air-conditioning refrigerant from the non-condensable gas as a gas component from the inside of the recovery cylinder from which the compressed condensed refrigerant is recovered.
A retransmission pipe that retransmits the gas component of the air-conditioning refrigerant separated by the gas separation module to the pipe between the refrigerant circuit and the refrigerant recovery device, and
Equipped with
When the pressure of the refrigerant circuit is equal to or lower than a predetermined pressure, the gas component of the air-conditioning refrigerant separated by the gas separation module is configured to be sent to the refrigerant circuit.
A refrigerant recovery system characterized by this. 請求項１に記載の冷媒回収システムであって、
前記再送配管内の圧力を調整する圧力調整器と、
前記冷媒回収装置の前記空調用冷媒の取り込み口における圧力よりも、前記再送配管内の圧力が高くなるように、前記圧力調整器を制御する再送制御部と、を備える、
ことを特徴とする冷媒回収システム。 The refrigerant recovery system according to claim 1.
A pressure regulator that adjusts the pressure in the retransmission pipe,
A retransmission control unit that controls the pressure regulator so that the pressure in the retransmission pipe is higher than the pressure at the intake port of the air-conditioning refrigerant of the refrigerant recovery device is provided.
A refrigerant recovery system characterized by this. 請求項１または２に記載の冷媒回収システムであって、
前記回収ボンベは、ガス成分を取り出すガス出入口を含み、
前記冷媒回収システムは、前記ガス出入口に接続されて前記回収ボンベから前記ガス成分が入り込む発送配管を備え、
前記ガス分離モジュールには、前記発送配管が接続されて前記発送配管から前記ガス成分が入り込み、前記ガス分離モジュールは、前記ガス成分を非凝縮性ガスと前記空調用冷媒に分離し、
前記再送配管には、前記ガス分離モジュールが接続されて、前記ガス分離モジュールが分離した前記空調用冷媒である再送ガス冷媒が入り込み、前記再送配管は、前記再送ガス冷媒を、前記冷媒回路と前記冷媒回収装置の間の配管内に送る、
ことを特徴とする冷媒回収システム。 The refrigerant recovery system according to claim 1 or 2.
The recovery cylinder includes a gas inlet / outlet for extracting a gas component.
The refrigerant recovery system includes a delivery pipe connected to the gas inlet / outlet and into which the gas component enters from the recovery cylinder.
The shipping pipe is connected to the gas separation module, and the gas component enters from the shipping pipe. The gas separation module separates the gas component into a non-condensable gas and the air-conditioning refrigerant.
The gas separation module is connected to the retransmission pipe, and the retransmission gas refrigerant which is the air-conditioning refrigerant separated from the gas separation module enters the retransmission pipe. The retransmission pipe uses the retransmission gas refrigerant as the refrigerant circuit and the refrigerant circuit. Send into the piping between the refrigerant recovery devices,
A refrigerant recovery system characterized by this. 請求項３に記載の冷媒回収システムであって、
前記発送配管の前記ガス出入口と前記ガス分離モジュールの間の開閉を行う制御弁と、
前記制御弁を制御する発送制御部と、
前記回収ボンベ内の温度および圧力のそれぞれを検出する温度検出器および圧力検出器と、
前記回収ボンベに回収される冷媒である回収冷媒の温度に対する飽和蒸気圧の圧力特性を記憶する記憶部と、を備え、
前記発送制御部は、
前記圧力特性に基づいて、前記温度検出器の検出温度における前記回収冷媒の飽和蒸気圧を取得し、
取得された前記飽和蒸気圧よりも、前記圧力検出器の検出圧力が高い高圧状態の場合には、前記制御弁を開状態に制御し、前記高圧状態ではない場合には、前記制御弁を閉状態に制御する、
ことを特徴とする冷媒回収システム。 The refrigerant recovery system according to claim 3.
A control valve that opens and closes between the gas inlet / outlet of the shipping pipe and the gas separation module.
A delivery control unit that controls the control valve,
A temperature detector and a pressure detector that detect each of the temperature and pressure in the recovery cylinder,
A storage unit for storing the pressure characteristics of the saturated vapor pressure with respect to the temperature of the recovered refrigerant, which is the refrigerant recovered in the recovery cylinder, is provided.
The shipping control unit
Based on the pressure characteristics, the saturated vapor pressure of the recovered refrigerant at the detection temperature of the temperature detector is obtained.
When the detection pressure of the pressure detector is higher than the acquired saturated vapor pressure in a high pressure state, the control valve is controlled to be in the open state, and when the pressure is not in the high pressure state, the control valve is closed. Control to state,
A refrigerant recovery system characterized by this. 請求項４に記載の冷媒回収システムであって、
前記回収冷媒の種類を入力する入力部を備え、
前記記憶部には、複数種類の冷媒のそれぞれの前記圧力特性が記憶されており、
前記発送制御部は、
前記入力部から入力された前記回収冷媒の種類に対応する、前記記憶部に記憶された前記圧力特性を用いて、前記制御弁の開閉状態を制御する、
ことを特徴とする冷媒回収システム。 The refrigerant recovery system according to claim 4.
It is provided with an input unit for inputting the type of the recovered refrigerant.
The storage unit stores the pressure characteristics of each of the plurality of types of refrigerants.
The shipping control unit
The open / closed state of the control valve is controlled by using the pressure characteristic stored in the storage unit, which corresponds to the type of the recovered refrigerant input from the input unit.
A refrigerant recovery system characterized by this. 請求項４または５に記載の冷媒回収システムであって、
前記冷媒回路と前記冷媒回収装置の間に配置された三方弁と、
前記三方弁を制御する三方弁制御部と、を備え、
前記三方弁は、第１、２及び３ポートを含み、
前記三方弁の前記第１ポートは前記冷媒回路に接続されており、前記三方弁の前記第２ポートは前記冷媒回収装置に接続されており、前記三方弁の前記第３ポートは前記再送配管に接続されており、
前記三方弁制御部は、
前記発送配管の前記制御弁が閉状態の場合には、前記三方弁の前記第１ポートと前記第２ポートが連通状態になるように前記三方弁を制御し、
前記発送配管の前記制御弁が開状態の場合には、前記三方弁の前記第２ポートと前記第３ポートが連通状態になるように前記三方弁を制御する、
ことを特徴とする冷媒回収システム。 The refrigerant recovery system according to claim 4 or 5.
A three-way valve arranged between the refrigerant circuit and the refrigerant recovery device,
A three-way valve control unit that controls the three-way valve is provided.
The three-way valve includes the first, second and third ports.
The first port of the three-way valve is connected to the refrigerant circuit, the second port of the three-way valve is connected to the refrigerant recovery device, and the third port of the three-way valve is connected to the retransmission pipe. Connected and
The three-way valve control unit
When the control valve of the delivery pipe is in the closed state, the three-way valve is controlled so that the first port and the second port of the three-way valve are in a communicating state.
When the control valve of the delivery pipe is in the open state, the three-way valve is controlled so that the second port and the third port of the three-way valve communicate with each other.
A refrigerant recovery system characterized by this. 請求項４または５に記載の冷媒回収システムであって、
前記冷媒回路と前記冷媒回収装置の間に配置された三方弁と、
前記三方弁を制御する三方弁制御部と、
前記冷媒回路の圧力を検出する別の圧力検出器と、を備え、
前記三方弁は、第１、２及び３ポートを含み、
前記三方弁の前記第１ポートは前記冷媒回路に接続されており、前記三方弁の前記第２ポートは前記冷媒回収装置に接続されており、前記三方弁の前記第３ポートは前記再送配管に接続されており、
前記三方弁制御部は、
前記発送配管の前記制御弁が閉状態の場合には、前記三方弁の前記第１ポートと前記第２ポートが連通状態になるように前記三方弁を制御し、
前記発送配管の前記制御弁が開状態、かつ、前記別の圧力検出器の検出圧力が前記予め定められた圧力より高い場合には、前記三方弁の前記第２ポートと前記第３ポートが連通状態になるように前記三方弁を制御し、
前記発送配管の前記制御弁が開状態、かつ、前記別の圧力検出器の検出圧力が前記予め定められた圧力以下の場合には、前記三方弁の前記第１ポートと前記第３ポートが連通状態になるように前記三方弁を制御する、
ことを特徴とする冷媒回収システム。 The refrigerant recovery system according to claim 4 or 5.
A three-way valve arranged between the refrigerant circuit and the refrigerant recovery device,
A three-way valve control unit that controls the three-way valve,
With another pressure detector for detecting the pressure of the refrigerant circuit,
The three-way valve includes the first, second and third ports.
The first port of the three-way valve is connected to the refrigerant circuit, the second port of the three-way valve is connected to the refrigerant recovery device, and the third port of the three-way valve is connected to the retransmission pipe. Connected and
The three-way valve control unit
When the control valve of the delivery pipe is in the closed state, the three-way valve is controlled so that the first port and the second port of the three-way valve are in a communicating state.
When the control valve of the delivery pipe is in the open state and the detection pressure of the other pressure detector is higher than the predetermined pressure, the second port and the third port of the three-way valve communicate with each other. Control the three-way valve so that it is in a state,
When the control valve of the delivery pipe is in the open state and the detection pressure of the other pressure detector is equal to or lower than the predetermined pressure, the first port and the third port of the three-way valve communicate with each other. Control the three-way valve so that it is in a state,
A refrigerant recovery system characterized by this. 冷凍空調機器の冷媒回路から空調用冷媒を回収する冷媒回収方法であって、
冷媒回収装置を用い、前記空調用冷媒に圧縮凝縮を行って圧縮凝縮冷媒を生成する生成ステップと、
前記冷媒回収装置が生成した前記圧縮凝縮冷媒を回収ボンベに回収する回収ステップと、
ガス分離モジュールを用い、前記圧縮凝縮冷媒を回収した前記回収ボンベの内部から前記空調用冷媒をガス成分として非凝縮性ガスと分離させる分離ステップと、
前記ガス分離モジュールが分離した前記空調用冷媒のガス成分を前記冷媒回路と前記冷媒回収装置の間の配管に再送させる再送ステップと、
前記冷媒回路の圧力が予め定められた圧力以下の場合に、前記ガス分離モジュールが分離した前記空調用冷媒のガス成分を、前記冷媒回路に送るステップと、
を備えることを特徴とする冷媒回収方法。 It is a refrigerant recovery method that recovers the air-conditioning refrigerant from the refrigerant circuit of the refrigerating and air-conditioning equipment.
Using a refrigerant recovery device, a generation step of compressing and condensing the air-conditioning refrigerant to generate a compressed and condensed refrigerant, and
A recovery step of recovering the compressed and condensed refrigerant generated by the refrigerant recovery device in a recovery cylinder,
A separation step of separating the air-conditioning refrigerant as a gas component from the non-condensable gas from the inside of the recovery cylinder from which the compressed and condensed refrigerant is recovered by using a gas separation module.
A retransmission step of retransmitting the gas component of the air-conditioning refrigerant separated by the gas separation module to the piping between the refrigerant circuit and the refrigerant recovery device.
A step of sending the gas component of the air-conditioning refrigerant separated by the gas separation module to the refrigerant circuit when the pressure of the refrigerant circuit is equal to or lower than a predetermined pressure.
A refrigerant recovery method comprising. 冷凍空調機器の冷媒回路から空調用冷媒を回収する冷媒回収システムであって、
前記空調用冷媒に圧縮凝縮を行って圧縮凝縮冷媒を生成する冷媒回収装置と、
前記冷媒回収装置が生成した前記圧縮凝縮冷媒を回収する回収ボンベと、
前記圧縮凝縮冷媒を回収した前記回収ボンベの内部から前記空調用冷媒を分離させるガス分離モジュールと、
前記ガス分離モジュールが分離した前記空調用冷媒を前記冷媒回収装置に再送させる再送配管と、
を備え、
前記回収ボンベは、ガス成分を取り出すガス出入口を含み、
前記冷媒回収システムは、前記ガス出入口に接続されて前記回収ボンベから前記ガス成分が入り込む発送配管をさらに備え、
前記ガス分離モジュールには、前記発送配管が接続されて前記発送配管から前記ガス成分が入り込み、前記ガス分離モジュールは、前記ガス成分を非凝縮性ガスと前記空調用冷媒に分離し、
前記再送配管には、前記ガス分離モジュールが接続されて、前記ガス分離モジュールが分離した前記空調用冷媒である再送ガス冷媒が入り込み、前記再送配管は、前記再送ガス冷媒を、前記冷媒回路と前記冷媒回収装置の間の配管内に送り、
前記冷媒回収システムは、
前記発送配管の前記ガス出入口と前記ガス分離モジュールの間の開閉を行う制御弁と、
前記制御弁を制御する発送制御部と、
前記回収ボンベ内の温度および圧力のそれぞれを検出する温度検出器および圧力検出器と、
前記回収ボンベに回収される冷媒である回収冷媒の温度に対する飽和蒸気圧の圧力特性を記憶する記憶部と、をさらに備え、
前記発送制御部は、
前記圧力特性に基づいて、前記温度検出器の検出温度における前記回収冷媒の飽和蒸気圧を取得し、
取得された前記飽和蒸気圧よりも、前記圧力検出器の検出圧力が高い高圧状態の場合には、前記制御弁を開状態に制御し、前記高圧状態ではない場合には、前記制御弁を閉状態に制御し、
前記冷媒回収システムは、
前記冷媒回路と前記冷媒回収装置の間に配置された三方弁と、
前記三方弁を制御する三方弁制御部と、
前記冷媒回路の圧力を検出する別の圧力検出器と、をさらに備え、
前記三方弁は、第１、２及び３ポートを含み、
前記三方弁の前記第１ポートは前記冷媒回路に接続されており、前記三方弁の前記第２ポートは前記冷媒回収装置に接続されており、前記三方弁の前記第３ポートは前記再送配管に接続されており、
前記三方弁制御部は、
前記発送配管の前記制御弁が閉状態の場合には、前記三方弁の前記第１ポートと前記第２ポートが連通状態になるように前記三方弁を制御し、
前記発送配管の前記制御弁が開状態、かつ、前記別の圧力検出器の検出圧力が予め定められた圧力より高い場合には、前記三方弁の前記第２ポートと前記第３ポートが連通状態になるように前記三方弁を制御し、
前記発送配管の前記制御弁が開状態、かつ、前記別の圧力検出器の検出圧力が前記予め定められた圧力以下の場合には、前記三方弁の前記第１ポートと前記第３ポートが連通状態になるように前記三方弁を制御する、
ことを特徴とする冷媒回収システム。 A refrigerant recovery system that recovers air-conditioning refrigerant from the refrigerant circuit of refrigerating and air-conditioning equipment.
A refrigerant recovery device that compresses and condenses the air-conditioning refrigerant to generate a compressed and condensed refrigerant.
A recovery cylinder that recovers the compressed and condensed refrigerant generated by the refrigerant recovery device,
A gas separation module that separates the air-conditioning refrigerant from the inside of the recovery cylinder from which the compressed and condensed refrigerant is recovered.
A retransmission pipe that retransmits the air-conditioning refrigerant separated by the gas separation module to the refrigerant recovery device, and
Equipped with
The recovery cylinder includes a gas inlet / outlet for extracting a gas component.
The refrigerant recovery system further comprises a delivery pipe connected to the gas inlet / outlet and into which the gas component enters from the recovery cylinder.
The shipping pipe is connected to the gas separation module, and the gas component enters from the shipping pipe. The gas separation module separates the gas component into a non-condensable gas and the air-conditioning refrigerant.
The gas separation module is connected to the retransmission pipe, and the retransmission gas refrigerant which is the air-conditioning refrigerant separated from the gas separation module enters the retransmission pipe. The retransmission pipe uses the retransmission gas refrigerant as the refrigerant circuit and the refrigerant circuit. Send into the piping between the refrigerant recovery devices,
The refrigerant recovery system is
A control valve that opens and closes between the gas inlet / outlet of the shipping pipe and the gas separation module.
A delivery control unit that controls the control valve,
A temperature detector and a pressure detector that detect each of the temperature and pressure in the recovery cylinder,
Further, a storage unit for storing the pressure characteristics of the saturated vapor pressure with respect to the temperature of the recovered refrigerant, which is the refrigerant recovered in the recovery cylinder, is provided.
The shipping control unit
Based on the pressure characteristics, the saturated vapor pressure of the recovered refrigerant at the detection temperature of the temperature detector is obtained.
When the detection pressure of the pressure detector is higher than the acquired saturated vapor pressure in a high pressure state, the control valve is controlled to be in the open state, and when the pressure is not in the high pressure state, the control valve is closed. Control to state,
The refrigerant recovery system is
A three-way valve arranged between the refrigerant circuit and the refrigerant recovery device,
A three-way valve control unit that controls the three-way valve,
Further equipped with another pressure detector for detecting the pressure of the refrigerant circuit,
The three-way valve includes the first, second and third ports.
The first port of the three-way valve is connected to the refrigerant circuit, the second port of the three-way valve is connected to the refrigerant recovery device, and the third port of the three-way valve is connected to the retransmission pipe. Connected and
The three-way valve control unit
When the control valve of the delivery pipe is in the closed state, the three-way valve is controlled so that the first port and the second port of the three-way valve are in a communicating state.
When the control valve of the shipping pipe is in the open state and the detection pressure of the other pressure detector is higher than a predetermined pressure, the second port and the third port of the three-way valve are in a communicating state. Control the three-way valve so that
When the control valve of the delivery pipe is in the open state and the detection pressure of the other pressure detector is equal to or lower than the predetermined pressure, the first port and the third port of the three-way valve communicate with each other. Control the three-way valve so that it is in a state,
A refrigerant recovery system characterized by this. 冷凍空調機器の冷媒回路から空調用冷媒を回収する冷媒回収方法であって、
冷媒回収装置を用い、前記空調用冷媒に圧縮凝縮を行って圧縮凝縮冷媒を生成する生成ステップと、
前記冷媒回収装置が生成した前記圧縮凝縮冷媒を回収ボンベに回収する回収ステップと、
ガス分離モジュールを用い、前記圧縮凝縮冷媒を回収した前記回収ボンベの内部に含まれるガス成分から前記空調用冷媒を分離させる分離ステップと、
再送配管を用い、前記ガス分離モジュールが分離した前記空調用冷媒を前記冷媒回収装置に再送させる再送ステップと、
を備え、
前記回収ボンベは、ガス成分を取り出すガス出入口を含み、
前記分離ステップにおいて、前記ガス出入口に接続されて前記回収ボンベから前記ガス成分が入り込む発送配管を用い、
前記ガス分離モジュールには、前記発送配管が接続されて前記発送配管から前記ガス成分が入り込み、前記ガス分離モジュールは、前記ガス成分を非凝縮性ガスと前記空調用冷媒に分離し、
前記再送配管には、前記ガス分離モジュールが接続されて、前記ガス分離モジュールが分離した前記空調用冷媒である再送ガス冷媒が入り込み、前記再送配管は、前記再送ガス冷媒を、前記冷媒回路と前記冷媒回収装置の間の配管内に送り、
前記分離ステップにおいて、
前記発送配管の前記ガス出入口と前記ガス分離モジュールの間の開閉を行う制御弁と、
前記制御弁を制御する発送制御部と、
前記回収ボンベ内の温度および圧力のそれぞれを検出する温度検出器および圧力検出器と、
前記回収ボンベに回収される冷媒である回収冷媒の温度に対する飽和蒸気圧の圧力特性を記憶する記憶部と、を用い、
前記発送制御部は、
前記圧力特性に基づいて、前記温度検出器の検出温度における前記回収冷媒の飽和蒸気圧を取得し、
取得された前記飽和蒸気圧よりも、前記圧力検出器の検出圧力が高い高圧状態の場合には、前記制御弁を開状態に制御し、前記高圧状態ではない場合には、前記制御弁を閉状態に制御し、
前記再送ステップにおいて、
前記冷媒回路と前記冷媒回収装置の間に配置された三方弁と、
前記三方弁を制御する三方弁制御部と、
前記冷媒回路の圧力を検出する別の圧力検出器と、を用い、
前記三方弁は、第１、２及び３ポートを含み、
前記三方弁の前記第１ポートは前記冷媒回路に接続されており、前記三方弁の前記第２ポートは前記冷媒回収装置に接続されており、前記三方弁の前記第３ポートは前記再送配管に接続されており、
前記三方弁制御部は、
前記発送配管の前記制御弁が閉状態の場合には、前記三方弁の前記第１ポートと前記第２ポートが連通状態になるように前記三方弁を制御し、
前記発送配管の前記制御弁が開状態、かつ、前記別の圧力検出器の検出圧力が予め定められた圧力より高い場合には、前記三方弁の前記第２ポートと前記第３ポートが連通状態になるように前記三方弁を制御し、
前記発送配管の前記制御弁が開状態、かつ、前記別の圧力検出器の検出圧力が前記予め定められた圧力以下の場合には、前記三方弁の前記第１ポートと前記第３ポートが連通状態になるように前記三方弁を制御する、
ことを特徴とする冷媒回収方法。 It is a refrigerant recovery method that recovers the air-conditioning refrigerant from the refrigerant circuit of the refrigerating and air-conditioning equipment.
Using a refrigerant recovery device, a generation step of compressing and condensing the air-conditioning refrigerant to generate a compressed and condensed refrigerant, and
A recovery step of recovering the compressed and condensed refrigerant generated by the refrigerant recovery device in a recovery cylinder,
A separation step of using a gas separation module to separate the air-conditioning refrigerant from the gas component contained inside the recovery cylinder from which the compressed and condensed refrigerant has been recovered.
A retransmission step of retransmitting the air-conditioning refrigerant separated by the gas separation module to the refrigerant recovery device using a retransmission pipe, and a retransmission step.
Equipped with
The recovery cylinder includes a gas inlet / outlet for extracting a gas component.
In the separation step, a delivery pipe connected to the gas inlet / outlet and into which the gas component enters from the recovery cylinder is used.
The shipping pipe is connected to the gas separation module, and the gas component enters from the shipping pipe. The gas separation module separates the gas component into a non-condensable gas and the air-conditioning refrigerant.
The gas separation module is connected to the retransmission pipe, and the retransmission gas refrigerant which is the air-conditioning refrigerant separated from the gas separation module enters the retransmission pipe. The retransmission pipe uses the retransmission gas refrigerant as the refrigerant circuit and the refrigerant circuit. Send into the piping between the refrigerant recovery devices,
In the separation step
A control valve that opens and closes between the gas inlet / outlet of the shipping pipe and the gas separation module.
A delivery control unit that controls the control valve,
A temperature detector and a pressure detector that detect each of the temperature and pressure in the recovery cylinder,
Using a storage unit that stores the pressure characteristics of the saturated vapor pressure with respect to the temperature of the recovered refrigerant, which is the refrigerant recovered in the recovery cylinder, is used.
The shipping control unit
Based on the pressure characteristics, the saturated vapor pressure of the recovered refrigerant at the detection temperature of the temperature detector is obtained.
When the detection pressure of the pressure detector is higher than the acquired saturated vapor pressure in a high pressure state, the control valve is controlled to be in the open state, and when the pressure is not in the high pressure state, the control valve is closed. Control to state,
In the retransmission step
A three-way valve arranged between the refrigerant circuit and the refrigerant recovery device,
A three-way valve control unit that controls the three-way valve,
Using another pressure detector that detects the pressure of the refrigerant circuit,
The three-way valve includes the first, second and third ports.
The first port of the three-way valve is connected to the refrigerant circuit, the second port of the three-way valve is connected to the refrigerant recovery device, and the third port of the three-way valve is connected to the retransmission pipe. Connected and
The three-way valve control unit
When the control valve of the delivery pipe is in the closed state, the three-way valve is controlled so that the first port and the second port of the three-way valve are in a communicating state.
When the control valve of the shipping pipe is in the open state and the detection pressure of the other pressure detector is higher than a predetermined pressure, the second port and the third port of the three-way valve are in a communicating state. Control the three-way valve so that
When the control valve of the delivery pipe is in the open state and the detection pressure of the other pressure detector is equal to or lower than the predetermined pressure, the first port and the third port of the three-way valve communicate with each other. Control the three-way valve so that it is in a state,
A refrigerant recovery method characterized by this.
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