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JP2007225184A - Method for recovering refrigerating machine oil - Google Patents

Method for recovering refrigerating machine oil Download PDF

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Publication number
JP2007225184A
JP2007225184A JP2006046343A JP2006046343A JP2007225184A JP 2007225184 A JP2007225184 A JP 2007225184A JP 2006046343 A JP2006046343 A JP 2006046343A JP 2006046343 A JP2006046343 A JP 2006046343A JP 2007225184 A JP2007225184 A JP 2007225184A
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refrigerant
circuit
gas side
heat source
refrigerating machine
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JP3956997B1 (en
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Junichi Shimoda
順一 下田
Sadayuki Wada
定幸 和田
Kazufumi Yamaoka
和史 山岡
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Daikin Industries Ltd
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Daikin Industries Ltd
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Priority to JP2006046343A priority Critical patent/JP3956997B1/en
Priority to AU2007225990A priority patent/AU2007225990B2/en
Priority to EP07714564A priority patent/EP1992893A4/en
Priority to PCT/JP2007/053061 priority patent/WO2007105425A1/en
Priority to CN2007800044629A priority patent/CN101379351B/en
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Publication of JP3956997B1 publication Critical patent/JP3956997B1/en
Publication of JP2007225184A publication Critical patent/JP2007225184A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B45/00Arrangements for charging or discharging refrigerant

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To reduce labor hours while effectively recovering a refrigerating machine oil, in a method for recovering the refrigerating machine oil from connecting pipes (23, 24) of a refrigerating device (10) equipped with a refrigerant circuit (20) composed of a heat source unit (11) and a utilization unit (13) connected by the connecting pipes (23, 24). <P>SOLUTION: A first process and a second process are performed in order. In the first process, the refrigerating machine oil is recovered along with a part of a refrigerant communicated with a gas side port (28) of the refrigerant circuit (20), from the gas side port (28) opening to the gas side connecting pipe (24) at a closed position of a gas side closing valve (26) provided at one end of a heat source side circuit (21). In the second process, in the state of the gas side closing valve (26) closed, the refrigerating machine oil is removed along with a part or the entire refrigerant of a part of the refrigerant circuit (20) communicating with a liquid side port (27), from the liquid side port (27) opening to the liquid side connecting pipe (23) at a closed position of a liquid side closing valve (25) provided at the other end of the heat source side circuit (21). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、熱源ユニットと利用ユニットとがガス側連絡配管及び液側連絡配管で接続されて構成された冷媒回路を備える冷凍装置について、そのガス側連絡配管及び液側連絡配管から冷凍機油を回収する冷凍機油の回収方法に関するものである。   The present invention recovers refrigerating machine oil from a gas side communication pipe and a liquid side connection pipe with respect to a refrigeration apparatus having a refrigerant circuit configured by connecting a heat source unit and a utilization unit by a gas side connection pipe and a liquid side connection pipe. The present invention relates to a method for collecting refrigerating machine oil.

従来より、熱源ユニットと利用ユニットとが連絡配管で接続されて構成された冷媒回路を備える冷凍装置に関して、その連絡配管内の冷凍機油を効率的に除去するための方法が知られている。この種の冷凍機油の回収方法は、例えば熱源ユニット及び利用ユニットを更新するときに連絡配管をそのまま流用する場合に用いられる。   2. Description of the Related Art Conventionally, a method for efficiently removing refrigeration oil in a communication pipe is known for a refrigeration apparatus including a refrigerant circuit in which a heat source unit and a utilization unit are connected by a communication pipe. This type of refrigerating machine oil recovery method is used, for example, when the connection pipe is used as it is when the heat source unit and the utilization unit are updated.

具体的に、特許文献1にはこの種の冷凍機油の回収方法としての残油回収方法が開示されている。この残油回収方法では、冷媒回路の冷媒を熱源回路に集めるポンプダウン後に冷媒収容動作と冷媒充填動作とが行われる。冷媒収容動作では、液側閉鎖弁及びガス側閉鎖弁の一方を閉鎖して他方を開口し、閉鎖している閉鎖弁のポートに回収器を接続して冷媒回路内の冷媒と共に冷凍機油を回収する。冷媒充填動作では、冷媒収容動作で閉鎖した方の閉鎖弁を開く一方で、開口した方の閉鎖弁を閉じるように設定する。そして、閉じている方の閉鎖弁のポートに冷媒収容動作で回収した冷媒を収容する回収器を冷媒再生器を介して接続し、その回収器から冷媒を吐出させて冷媒再生器で冷凍機油を除去した冷媒を冷媒回路へ充填する。この残油回収方法では、必要に応じて冷媒収容動作と冷媒充填動作とを繰り返し行われる。
特開2003−194437号公報
Specifically, Patent Document 1 discloses a residual oil recovery method as a recovery method of this type of refrigeration oil. In this residual oil recovery method, the refrigerant storage operation and the refrigerant charging operation are performed after the pump down that collects the refrigerant in the refrigerant circuit in the heat source circuit. In the refrigerant storage operation, one of the liquid side shutoff valve and the gas side shutoff valve is closed and the other is opened, and a collector is connected to the port of the closed shutoff valve to collect the refrigerating machine oil together with the refrigerant in the refrigerant circuit. To do. In the refrigerant charging operation, the closing valve that is closed in the refrigerant containing operation is opened while the opening valve that is opened is closed. Then, a recovery unit that stores the refrigerant recovered by the refrigerant storage operation is connected to the port of the closed closing valve via the refrigerant regenerator, and the refrigerant is discharged from the recovery unit so that the refrigerating machine oil is supplied by the refrigerant regenerator. The removed refrigerant is filled into the refrigerant circuit. In this residual oil recovery method, the refrigerant storage operation and the refrigerant charging operation are repeatedly performed as necessary.
JP 2003-194437 A

ところで、従来の冷凍機油の回収方法では、連絡配管から冷凍機油をより多く回収するためには、冷媒収容動作だけでなく冷媒充填動作を行う必要があった。つまり、冷媒収容動作後に冷媒充填動作を行いさらに冷媒収容動作が必要になるため、少なくとも3回の動作が必要であった。従って、冷凍機油を回収する作業が非常に手間を要するものになっていた。   By the way, in the conventional refrigerating machine oil recovery method, in order to collect more refrigerating machine oil from the connection pipe, it is necessary to perform not only the refrigerant storage operation but also the refrigerant charging operation. That is, since the refrigerant filling operation is performed after the refrigerant accommodation operation and further the refrigerant accommodation operation is required, at least three operations are necessary. Therefore, the operation of recovering the refrigerating machine oil is very laborious.

本発明は、かかる点に鑑みてなされたものであり、その目的は、熱源ユニットと利用ユニットとが連絡配管で接続されて構成された冷媒回路を備える冷凍装置についての連絡配管から冷凍機油を回収する方法において、冷凍機油を効率的に回収しつつ回収する手間を軽減させることである。   The present invention has been made in view of the above points, and an object of the present invention is to collect refrigerating machine oil from a communication pipe for a refrigeration apparatus including a refrigerant circuit configured by connecting a heat source unit and a utilization unit through a communication pipe. In the method to do, it is reducing the effort which collects refrigerating machine oil, collecting efficiently.

第1の発明は、熱源ユニット(11)内の熱源側回路(21)と利用ユニット(13)内の利用側回路(22)とがガス側連絡配管(24)及び液側連絡配管(23)で接続されて構成された冷媒回路(20)で冷凍サイクルを行う冷凍装置(10)について、該ガス側連絡配管(24)及び液側連絡配管(23)から冷凍機油を回収する方法を対象とする。そして、この方法は、上記熱源側回路(21)の一端に設けられたガス側閉鎖弁(26)の閉鎖位置のガス側連絡配管(24)側に開口するガス側ポート(28)から、上記冷媒回路(20)のうち該ガス側ポート(28)に連通する部分の冷媒の一部と共に冷凍機油を回収する第1工程と、上記ガス側閉鎖弁(26)を閉じた状態で、上記熱源側回路(21)の他端に設けられた液側閉鎖弁(25)の閉鎖位置の液側連絡配管(23)側に開口する液側ポート(27)から、上記冷媒回路(20)のうち該液側ポート(27)に連通する部分の冷媒の一部又は全部と共に冷凍機油を回収する第2工程とを順に行う。   In the first invention, the heat source side circuit (21) in the heat source unit (11) and the utilization side circuit (22) in the utilization unit (13) are connected to the gas side communication pipe (24) and the liquid side communication pipe (23). A method for recovering refrigeration oil from the gas-side connecting pipe (24) and the liquid-side connecting pipe (23) with respect to the refrigeration apparatus (10) that performs the refrigeration cycle in the refrigerant circuit (20) configured to be connected by To do. And this method consists of the above from the gas side port (28) opened to the gas side connecting pipe (24) side of the closed position of the gas side shutoff valve (26) provided at one end of the heat source side circuit (21). A first step of recovering refrigerating machine oil together with a part of the refrigerant communicating with the gas side port (28) in the refrigerant circuit (20), and the heat source with the gas side shut-off valve (26) closed. From the liquid side port (27) opened to the liquid side connecting pipe (23) side of the liquid side closing valve (25) provided at the other end of the side circuit (21), the refrigerant circuit (20) The second step of collecting the refrigerating machine oil together with part or all of the part of the refrigerant communicating with the liquid side port (27) is sequentially performed.

第1の発明では、第1工程と第2工程とが順に行われる。ところで、第1工程の前は、ガス側連絡配管(24)よりも利用側回路(22)や液側連絡配管(23)の方に多くの液冷媒が存在しているのが通常である。この状態で、第1工程において、少なくともガス側連絡配管(24)、利用側回路(22)、及び液側連絡配管(23)に連通するガス側ポート(28)から冷媒が吸い出されると、ガス側連絡配管(24)には利用側回路(22)や液側連絡配管(23)からの冷媒が流入する。そして、ガス側連絡配管(24)に付着する冷凍機油が冷媒の流れによって剥がされる。剥がされた冷凍機油は、冷媒と共にガス側ポート(28)から回収される。   In the first invention, the first step and the second step are sequentially performed. By the way, before the 1st process, it is normal that many liquid refrigerants exist in the use side circuit (22) and the liquid side connection pipe (23) rather than the gas side connection pipe (24). In this state, when the refrigerant is sucked out from the gas side port (28) communicating with at least the gas side communication pipe (24), the use side circuit (22), and the liquid side communication pipe (23) in the first step, The refrigerant from the use side circuit (22) and the liquid side connection pipe (23) flows into the gas side connection pipe (24). The refrigerating machine oil adhering to the gas side communication pipe (24) is peeled off by the flow of the refrigerant. The peeled refrigeration oil is recovered from the gas side port (28) together with the refrigerant.

第1工程の終了時点では、冷媒回路(20)のうち液側連絡配管(23)、利用側回路(22)、及びガス側連絡配管(24)に冷媒が残存している状態になる。この状態で、第2工程において、少なくとも液側連絡配管(23)、利用側回路(22)、及びガス側連絡配管(24)に連通する液側ポート(27)から冷媒が吸い出されると、液側連絡配管(23)にはガス側連絡配管(24)側からの冷媒が流入する。そして、液側連絡配管(23)に付着する冷凍機油が冷媒の流れによって剥がされる。剥がされた冷凍機油は、冷媒と共に液側ポート(27)から回収される。なお、第2工程では、ガス側閉鎖弁(26)を閉じた状態にするので、熱源側回路(21)からガス側連絡配管(24)へ冷媒や冷凍機油が流入することはない。   At the end of the first step, the refrigerant remains in the liquid side communication pipe (23), the use side circuit (22), and the gas side communication pipe (24) in the refrigerant circuit (20). In this state, when the refrigerant is sucked out from the liquid side port (27) communicating with at least the liquid side communication pipe (23), the use side circuit (22), and the gas side communication pipe (24) in the second step, The refrigerant from the gas side connecting pipe (24) flows into the liquid side connecting pipe (23). And the refrigeration oil adhering to the liquid side connection pipe (23) is peeled off by the flow of the refrigerant. The peeled refrigeration oil is recovered from the liquid side port (27) together with the refrigerant. In the second step, since the gas side shut-off valve (26) is closed, refrigerant and refrigerating machine oil do not flow from the heat source side circuit (21) into the gas side communication pipe (24).

この第1工程及び第2工程において各連絡配管(23,24)では、近い側のポート(27,28)から冷媒を吸い出す場合の方がエネルギーロスが小さいので冷媒の流速が大きくなる。従って、ガス側連絡配管(24)に付着する冷媒は、ガス側ポート(28)から冷媒を吸い出す第1工程の際が多く剥がされ、液側連絡配管(23)に付着する冷媒は液側ポート(27)から冷媒を吸い出す第2工程の際が多く剥がされる。この第1の発明では、第1工程と第2工程とで別々のポート(27,28)から冷媒を吸い出すことで、各連絡配管(27,28)のぞれぞれで比較的多くの冷凍機油が剥がされるようにしている。   In each of the connection pipes (23, 24) in the first process and the second process, the refrigerant flow rate increases because the energy loss is smaller when the refrigerant is sucked out from the ports (27, 28) on the near side. Accordingly, the refrigerant adhering to the gas side communication pipe (24) is largely peeled off in the first step of sucking out the refrigerant from the gas side port (28), and the refrigerant adhering to the liquid side communication pipe (23) is removed from the liquid side port. A large amount of the second step of sucking out the refrigerant from (27) is peeled off. In the first aspect of the invention, the refrigerant is sucked out from the separate ports (27, 28) in the first step and the second step, so that a relatively large amount of refrigeration can be performed in each of the communication pipes (27, 28). Machine oil is peeled off.

第2の発明は、第1の発明において、上記ガス側閉鎖弁(26)を閉じた状態で上記第1工程を行う。   In a second aspect based on the first aspect, the first step is performed with the gas side closing valve (26) closed.

第2の発明では、第1工程においてガス側閉鎖弁(26)を閉じた状態でガス側ポート(28)から冷媒が吸い出される。従って、熱源側回路(21)の冷媒が、ガス側閉鎖弁(26)を通ってガス側ポート(28)から吸い出されることはない。   In the second invention, the refrigerant is sucked out from the gas side port (28) with the gas side closing valve (26) closed in the first step. Accordingly, the refrigerant in the heat source side circuit (21) is not sucked out from the gas side port (28) through the gas side closing valve (26).

第3の発明は、第1又は第2の発明において、上記液側閉鎖弁(25)を開いた状態で上記第1工程及び第2工程を行う。   According to a third invention, in the first or second invention, the first step and the second step are performed in a state where the liquid side closing valve (25) is opened.

第3の発明の第1工程において、ガス側ポート(28)は、ガス側連絡配管(24)、利用側回路(22)、及び液側連絡配管(23)だけでなく液側閉鎖弁(25)を介して熱源側回路(21)に連通する状態となる。第1工程では、この状態でガス側ポート(28)から冷媒が吸い出される。従って、第1工程では熱源側回路(21)の冷媒が液側閉鎖弁(25)を通って利用ユニット(13)側に流入するので、液側閉鎖弁(25)を閉じた状態で第1工程を行う場合に比べて、第1工程及び第2工程でガス側ポート(28)と液側ポート(27)の間の利用ユニット(13)側を行き来する冷媒量が増加する。   In the first step of the third invention, the gas side port (28) includes not only the gas side communication pipe (24), the use side circuit (22) and the liquid side communication pipe (23) but also the liquid side shut-off valve (25 ) To communicate with the heat source side circuit (21). In the first step, the refrigerant is sucked out from the gas side port (28) in this state. Accordingly, in the first step, the refrigerant in the heat source side circuit (21) flows into the utilization unit (13) side through the liquid side closing valve (25), and therefore the first side with the liquid side closing valve (25) closed. Compared with the case where a process is performed, the refrigerant | coolant amount which goes back and forth on the utilization unit (13) side between a gas side port (28) and a liquid side port (27) increases in a 1st process and a 2nd process.

第4の発明は、第1乃至第3の何れか1つの発明において、上記第2工程の終了後に上記熱源側回路(21)の冷媒を回収する第3工程を行う。   According to a fourth invention, in any one of the first to third inventions, a third step of collecting the refrigerant in the heat source side circuit (21) is performed after the end of the second step.

第4の発明では、第2工程後の第3工程で熱源側回路(21)の冷媒が回収される。従って、この冷凍機油の回収方法を行った後に熱源側回路(21)に残る冷媒の量が少なくなる。   In 4th invention, the refrigerant | coolant of a heat-source side circuit (21) is collect | recovered by the 3rd process after a 2nd process. Accordingly, the amount of refrigerant remaining in the heat source side circuit (21) after performing this method of recovering refrigeration oil is reduced.

第5の発明は、第4の発明において、上記第3工程では、上記ガス側閉鎖弁(26)を徐々に開きながらガス側ポート(28)から上記熱源側回路(21)の冷媒を回収する。   In a fifth aspect based on the fourth aspect, in the third step, the refrigerant in the heat source side circuit (21) is recovered from the gas side port (28) while gradually opening the gas side stop valve (26). .

第5の発明では、第3工程において、ガス側閉鎖弁(26)を徐々に開きながらガス側ポート(28)から熱源側回路(21)の冷媒を回収する作業が行われる。ここで、第3工程の開始前は、ガス側閉鎖弁(26)を挟んで、第1工程及び第2工程で冷媒及び冷凍機油が回収されたガス側連絡配管(24)側が熱源側回路(21)側よりも低圧になっている虞がある。そして、この場合にガス側閉鎖弁(26)を急激に開くと、熱源側回路(21)の冷媒や冷凍機油がガス側連絡配管(24)へ流入してしまう。この第5の発明では、ガス側閉鎖弁(26)を徐々に開くきながら冷媒を回収することで、熱源側回路(21)の冷媒や冷凍機油がガス側連絡配管(24)へ流入することを抑制している。   In 5th invention, the operation | work which collect | recovers the refrigerant | coolants of a heat-source side circuit (21) from a gas side port (28) is performed in a 3rd process, opening a gas side closing valve (26) gradually. Here, before the start of the third step, the side of the gas side communication pipe (24) from which the refrigerant and refrigerating machine oil have been recovered in the first step and the second step is sandwiched between the gas side closing valve (26) and the heat source side circuit ( 21) There is a risk of lower pressure than the side. In this case, if the gas side shut-off valve (26) is suddenly opened, the refrigerant and refrigerating machine oil in the heat source side circuit (21) flow into the gas side communication pipe (24). In the fifth aspect of the invention, the refrigerant and the refrigeration oil in the heat source side circuit (21) flow into the gas side connection pipe (24) by collecting the refrigerant while gradually opening the gas side stop valve (26). Is suppressed.

第6の発明は、第4の発明において、上記第3工程では、上記熱源側回路(21)に開口する熱源側ポート(9)から該熱源側回路(21)の冷媒を回収する作業と、上記ガス側閉鎖弁(26)を徐々に開きながらガス側ポート(28)から該熱源側回路(21)の冷媒を回収する作業とを行う。   According to a sixth invention, in the fourth invention, in the third step, the operation of recovering the refrigerant of the heat source side circuit (21) from the heat source side port (9) opening to the heat source side circuit (21); The operation of recovering the refrigerant in the heat source side circuit (21) from the gas side port (28) is performed while the gas side closing valve (26) is gradually opened.

第6の発明では、熱源側回路(21)の冷媒が、熱源側ポート(9)とガス側ポート(28)とから回収される。従って、この冷凍機油の回収方法を行った後に熱源側回路(21)に残る冷媒の量がさらに少なくなる。また、上記第5の発明と同様に、ガス側ポート(28)から熱源側回路(21)の冷媒を回収する作業をガス側閉鎖弁(26)を徐々に開きながら行うことで、熱源側回路(21)の冷媒や冷凍機油がガス側連絡配管(24)へ流入することを抑制している。   In the sixth invention, the refrigerant in the heat source side circuit (21) is recovered from the heat source side port (9) and the gas side port (28). Therefore, the amount of refrigerant remaining in the heat source side circuit (21) after performing this method of collecting refrigeration oil is further reduced. Similarly to the fifth aspect of the invention, the operation of recovering the refrigerant in the heat source side circuit (21) from the gas side port (28) is performed while the gas side shut-off valve (26) is gradually opened, so that the heat source side circuit (21) Refrigerant and refrigeration oil are prevented from flowing into the gas side connecting pipe (24).

本発明では、第1工程でガス側ポート(28)から冷媒を吸い出して主にガス側連絡配管(24)に付着する冷凍機油を剥がし、第2工程で液側ポート(27)から冷媒を吸い出して主に液側連絡配管(23)に付着する冷凍機油を剥がすようにしている。つまり、何れかのポート(27,28)から全ての冷媒を吸い出す場合は、吸い出すポート(27,28)とは逆側の連絡配管(23,24)の冷凍機油が回収されにくいが、ガス側ポート(28)から冷媒を吸い出す第1工程と液側ポート(27)から冷媒を吸い出す第2工程とを行うので、それぞれの連絡配管(23,24)から比較的多くの冷凍機油を回収することができる。また、冷凍機油の回収量を増加させるために冷媒充填作業を行う従来の方法では少なくとも3回以上の作業が必要となるが、本発明の方法では第1工程及び第2工程の2回の作業でガス側連絡配管(24)及び液側連絡配管(23)の冷凍機油を効率的に回収することができる。しかも、冷媒を充填しない分回収する冷媒量が少なくなるので、冷媒の回収に要する時間を短縮化することができる。従って、本発明によれば冷凍機油を効率的に回収しつつ回収する手間を軽減させることができる。   In the present invention, the refrigerant is sucked out from the gas side port (28) in the first step and the refrigerating machine oil mainly attached to the gas side connecting pipe (24) is peeled off, and the refrigerant is sucked out from the liquid side port (27) in the second step. The refrigeration oil adhering mainly to the liquid side communication pipe (23) is peeled off. In other words, when all the refrigerant is sucked out from one of the ports (27, 28), the refrigeration oil in the connecting pipe (23, 24) on the opposite side of the sucking out port (27, 28) is difficult to recover, but the gas side Since the first step of sucking out the refrigerant from the port (28) and the second step of sucking out the refrigerant from the liquid side port (27) are performed, a relatively large amount of refrigerating machine oil must be recovered from the respective connecting pipes (23, 24). Can do. In addition, in the conventional method in which the refrigerant filling operation is performed in order to increase the recovered amount of refrigerating machine oil, at least three operations are required. In the method of the present invention, the operations in the first step and the second step are performed twice. Thus, the refrigeration oil in the gas side connecting pipe (24) and the liquid side connecting pipe (23) can be efficiently recovered. In addition, since the amount of refrigerant to be collected is reduced by the amount not filled with the refrigerant, the time required for collecting the refrigerant can be shortened. Therefore, according to this invention, the effort which collect | recovers refrigeration oil efficiently can be reduced.

また、第2の発明では、第1工程において、ガス側閉鎖弁(26)を閉じた状態にすることで、熱源側回路(21)の冷媒がガス側閉鎖弁(26)を通ってガス側ポート(28)から吸い出されることはないようにしている。従って、ガス側閉鎖弁(26)を開いた状態で第1工程を行う場合に比べて、ガス側連絡配管(24)での冷媒の流速が大きくなるので、ガス側連絡配管(24)から剥がされて回収される冷凍機油の量が多くなる。   In the second invention, in the first step, the gas side shut-off valve (26) is closed, so that the refrigerant in the heat source side circuit (21) passes through the gas side shut-off valve (26) to the gas side. The port (28) is not sucked out. Therefore, compared with the case where the first step is performed with the gas side shut-off valve (26) opened, the flow rate of the refrigerant in the gas side communication pipe (24) is increased, so that the gas side connection pipe (24) is peeled off. As a result, the amount of refrigerating machine oil recovered is increased.

また、第3の発明では、液側閉鎖弁(25)を開いた状態で第1工程を行うことで、第1工程及び第2工程においてガス側ポート(28)と液側ポート(27)の間の利用ユニット(13)側を行き来する冷媒量が増加するようにしている。すなわち、ガス側連絡配管(24)及び液側連絡配管(23)を流通する冷媒の合計量が増加する。従って、ガス側連絡配管(24)及び液側連絡配管(23)からさらに多くの冷凍機油を剥がして回収することができる。   In the third aspect of the invention, the first step is performed with the liquid side shut-off valve (25) opened, so that the gas side port (28) and the liquid side port (27) can be connected in the first step and the second step. The amount of refrigerant going back and forth between the use units (13) is increased. That is, the total amount of refrigerant flowing through the gas side connecting pipe (24) and the liquid side connecting pipe (23) increases. Therefore, more refrigeration oil can be peeled off from the gas side connecting pipe (24) and the liquid side connecting pipe (23) and recovered.

また、第4の発明では、熱源側回路(21)の冷媒が回収する第3工程を行うことで、この冷凍機油の回収方法を行った後に熱源側回路(21)に残る冷媒が少なくなるようにしている。従って、熱源ユニット(11)を更新する場合は、撤去した熱源ユニット(11)から冷媒を回収する手間を省略又は軽減することができる。また、冷媒回路(20)の冷媒を入れ換える場合は、冷凍装置(10)の信頼性を向上させることができる。   In the fourth invention, the third step of recovering the refrigerant in the heat source side circuit (21) is performed, so that the refrigerant remaining in the heat source side circuit (21) is reduced after the refrigerating machine oil recovery method is performed. I have to. Therefore, when the heat source unit (11) is updated, the trouble of collecting the refrigerant from the removed heat source unit (11) can be omitted or reduced. Further, when replacing the refrigerant in the refrigerant circuit (20), the reliability of the refrigeration apparatus (10) can be improved.

また、第5の発明では、第3工程においてガス側ポート(28)から熱源側回路(21)の冷媒を回収する作業をガス側閉鎖弁(26)を徐々に開きながら行うことで、熱源側回路(21)の冷媒や冷凍機油が、冷媒及び冷凍機油が回収されたガス側連絡配管(24)へ流入しないようにしている。従って、第3工程後にガス側連絡配管(24)から冷媒や冷凍機油を回収することが必要な状態になることを回避することができる。   In the fifth aspect of the invention, the operation of recovering the refrigerant in the heat source side circuit (21) from the gas side port (28) in the third step is performed while the gas side shut-off valve (26) is gradually opened. The refrigerant and refrigerating machine oil in the circuit (21) are prevented from flowing into the gas side communication pipe (24) from which the refrigerant and refrigerating machine oil have been recovered. Accordingly, it is possible to avoid a state in which it is necessary to recover the refrigerant and the refrigerating machine oil from the gas side communication pipe (24) after the third step.

また、第6の発明によれば、熱源側回路(21)の冷媒を熱源側ポート(9)とガス側ポート(28)とから回収ことで、この冷凍機油の回収方法を行った後に熱源側回路(21)に残る冷媒がさらに少なくなるようにしている。従って、熱源ユニット(11)を更新する場合は、撤去した熱源ユニット(11)から冷媒を回収する手間を、省略又はさらに軽減することができる。また、冷媒回路(20)の冷媒を入れ換える場合は、冷凍装置(10)の信頼性をさらに向上させることができる。また、上記第5の発明と同様に、ガス側ポート(28)から熱源側回路(21)の冷媒を回収する作業をガス側閉鎖弁(26)を徐々に開きながら行うことで、第3工程後にガス側連絡配管(24)から冷媒や冷凍機油を回収することが必要な状態になることを回避することができる。   According to the sixth aspect of the invention, the refrigerant in the heat source side circuit (21) is recovered from the heat source side port (9) and the gas side port (28), so that after performing this refrigerating machine oil recovery method, the heat source side circuit (21) is recovered. The refrigerant remaining in the circuit (21) is further reduced. Therefore, when the heat source unit (11) is updated, the trouble of collecting the refrigerant from the removed heat source unit (11) can be omitted or further reduced. Further, when replacing the refrigerant in the refrigerant circuit (20), the reliability of the refrigeration apparatus (10) can be further improved. Similarly to the fifth aspect of the invention, the operation of recovering the refrigerant in the heat source side circuit (21) from the gas side port (28) is performed while the gas side shut-off valve (26) is gradually opened, so that the third step It can be avoided that the refrigerant or the refrigerating machine oil needs to be recovered from the gas side communication pipe (24) later.

本発明の実施形態について説明する。なお、以下では、先ず本発明に係る冷凍機油の回収方法が適用される冷凍装置としての空気調和装置について説明し、次に本発明に係る冷凍機油の回収方法について説明する。   An embodiment of the present invention will be described. In the following, an air conditioner as a refrigeration apparatus to which the method for recovering refrigeration oil according to the present invention is applied will be described first, and then a method for recovering refrigeration oil according to the present invention will be described.

−冷凍装置の構成−
図1は、この実施形態に係る冷凍装置(10)の概略構成図である。この冷凍装置(10)は、熱源ユニットである室外ユニット(11)と、利用ユニットである室内ユニット(13)とを備える空気調和装置であって、冷房運転と暖房運転とを切り換えて行うように構成されている。なお、室内ユニット(13)の台数は1台に限定されるものではなく複数であってもよい。
-Configuration of refrigeration equipment-
FIG. 1 is a schematic configuration diagram of a refrigeration apparatus (10) according to this embodiment. The refrigeration apparatus (10) is an air conditioner including an outdoor unit (11) that is a heat source unit and an indoor unit (13) that is a use unit, and performs switching between cooling operation and heating operation. It is configured. The number of indoor units (13) is not limited to one, and may be plural.

室外ユニット(11)内には、熱源側回路である室外回路(21)が設けられている。室内ユニット(13)内には、利用側回路である室内回路(22)が設けられている。この冷凍装置(10)では、室外回路(21)と室内回路(22)とを液側連絡配管(23)及びガス側連絡配管(24)で接続することによって蒸気圧縮冷凍サイクルを行う冷媒回路(20)が構成されている。   An outdoor circuit (21) which is a heat source side circuit is provided in the outdoor unit (11). In the indoor unit (13), an indoor circuit (22) which is a use side circuit is provided. In this refrigeration apparatus (10), a refrigerant circuit (for performing a vapor compression refrigeration cycle by connecting an outdoor circuit (21) and an indoor circuit (22) with a liquid side connecting pipe (23) and a gas side connecting pipe (24)) ( 20) is configured.

《室外ユニット》
室外ユニット(11)の室外回路(21)には、圧縮機(30)、四路切換弁(33)、室外熱交換器(34)、膨張弁(36)、レシーバ(39)及びアキュムレータ(35)が設けられている。室外回路(21)の一端には、液側連絡配管(23)が接続される液側閉鎖弁(25)が設けられている。室外回路(21)の他端には、ガス側連絡配管(24)が接続されるガス側閉鎖弁(26)が設けられている。
《Outdoor unit》
The outdoor circuit (21) of the outdoor unit (11) includes a compressor (30), a four-way switching valve (33), an outdoor heat exchanger (34), an expansion valve (36), a receiver (39) and an accumulator (35 ) Is provided. At one end of the outdoor circuit (21), a liquid side shut-off valve (25) to which the liquid side communication pipe (23) is connected is provided. The other end of the outdoor circuit (21) is provided with a gas side shut-off valve (26) to which the gas side communication pipe (24) is connected.

液側閉鎖弁(25)には、液側サービスポート(27)が設けられている。液側サービスポート(27)は、液側閉鎖弁(25)の閉鎖位置の液側連絡配管(23)側に開口している。一方、ガス側閉鎖弁(26)には、ガス側サービスポート(28)が設けられている。ガス側サービスポート(28)は、ガス側閉鎖弁(26)の閉鎖位置のガス側連絡配管(24)側に開口している。これらのポート(27,28)は、冷媒回路(20)内の冷媒及び冷凍機油を回収する時や、冷媒回路(20)への冷媒を充填する時に使用され、冷房運転及び暖房運転時は閉鎖されている。   The liquid side closing valve (25) is provided with a liquid side service port (27). The liquid side service port (27) opens to the liquid side connecting pipe (23) side of the liquid side closing valve (25) in the closed position. On the other hand, the gas side shut-off valve (26) is provided with a gas side service port (28). The gas side service port (28) opens to the gas side connecting pipe (24) side of the closed position of the gas side closing valve (26). These ports (27, 28) are used when recovering refrigerant and refrigerating machine oil in the refrigerant circuit (20) or when charging refrigerant into the refrigerant circuit (20), and are closed during cooling and heating operations. Has been.

圧縮機(30)は、密閉型で高圧ドーム型の圧縮機として構成されている。圧縮機(30)の吐出側は、吐出管(40)を介して四路切換弁(33)の第1ポート(P1)に接続されている。圧縮機(30)の吸入側は、吸入管(41)を介して四路切換弁(33)の第3ポート(P3)に接続されている。   The compressor (30) is configured as a hermetic and high-pressure dome type compressor. The discharge side of the compressor (30) is connected to the first port (P1) of the four-way switching valve (33) via the discharge pipe (40). The suction side of the compressor (30) is connected to the third port (P3) of the four-way switching valve (33) via the suction pipe (41).

室外熱交換器(34)は、クロスフィン式のフィン・アンド・チューブ型熱交換器として構成されている。この室外熱交換器(34)の近傍には、室外ファン(12)が設けられている。この室外熱交換器(34)では、室外ファン(12)によって送られる室外空気と流通する冷媒との間で熱交換が行われる。室外熱交換器(34)の一端は、接続配管(32)を介して四路切換弁(33)の第4ポート(P4)に接続されている。室外熱交換器(34)の他端は、液配管(42)を介して液側閉鎖弁(25)に接続されている。また、四路切換弁(33)の第2ポート(P2)はガス側閉鎖弁(26)が接続されている。   The outdoor heat exchanger (34) is configured as a cross fin type fin-and-tube heat exchanger. An outdoor fan (12) is provided in the vicinity of the outdoor heat exchanger (34). In the outdoor heat exchanger (34), heat is exchanged between the outdoor air sent by the outdoor fan (12) and the circulating refrigerant. One end of the outdoor heat exchanger (34) is connected to the fourth port (P4) of the four-way switching valve (33) via the connection pipe (32). The other end of the outdoor heat exchanger (34) is connected to the liquid side shut-off valve (25) via the liquid pipe (42). In addition, the gas side closing valve (26) is connected to the second port (P2) of the four-way switching valve (33).

接続配管(32)には、該接続配管(32)に開口する熱源側ポート(9)が設けられている。熱源側ポート(9)は、後述する第3工程で熱源側回路(21)の冷媒を回収する際に使用され、冷房運転及び暖房運転時は閉鎖されている。   The connection pipe (32) is provided with a heat source side port (9) that opens to the connection pipe (32). The heat source side port (9) is used when recovering the refrigerant of the heat source side circuit (21) in a third step which will be described later, and is closed during cooling operation and heating operation.

液配管(42)には、室外熱交換器(34)側から順にレシーバ(39)と膨張弁(36)とが設けられている。レシーバ(39)は、密閉容器状に形成されて、室外熱交換器(34)で凝縮した高圧冷媒を一時的に貯留できるようになっている。膨張弁(36)は開度可変の電子膨張弁として構成されている。   The liquid pipe (42) is provided with a receiver (39) and an expansion valve (36) in order from the outdoor heat exchanger (34) side. The receiver (39) is formed in a sealed container shape and can temporarily store the high-pressure refrigerant condensed in the outdoor heat exchanger (34). The expansion valve (36) is configured as an electronic expansion valve with variable opening.

吸入管(41)には、アキュムレータ(35)が設けられている。アキュムレータ(35)は、密閉容器状に形成されて、圧縮機(30)が液冷媒を吸入しないように圧縮機(30)へ向かう冷媒から液冷媒を分離して内部に貯留するように構成されている。   The suction pipe (41) is provided with an accumulator (35). The accumulator (35) is formed in a sealed container shape, and is configured to separate the liquid refrigerant from the refrigerant going to the compressor (30) and store it inside so that the compressor (30) does not suck the liquid refrigerant. ing.

四路切換弁(33)は、第1ポート(P1)と第2ポート(P2)が互いに連通して第3ポート(P3)と第4ポート(P4)が互いに連通する第1状態(図1に実線で示す状態)と、第1ポート(P1)と第4ポート(P4)が互いに連通して第2ポート(P2)と第3ポート(P3)が互いに連通する第2状態(図1に破線で示す状態)とが切り換え可能となっている。   The four-way selector valve (33) is in a first state in which the first port (P1) and the second port (P2) communicate with each other and the third port (P3) and the fourth port (P4) communicate with each other (FIG. 1). And a second state (FIG. 1) in which the first port (P1) and the fourth port (P4) communicate with each other and the second port (P2) and the third port (P3) communicate with each other. The state indicated by a broken line) can be switched.

《室内ユニット》
室内ユニット(13)の室内回路(22)には、室内熱交換器(37)が設けられている。室内回路(22)の一端には、液側連絡配管(23)が接続される液側フレア継手(38)が設けられている。室内回路(22)の他端には、ガス側連絡配管(24)が接続されるガス側フレア継手(39)が設けられている。
《Indoor unit》
The indoor circuit (22) of the indoor unit (13) is provided with an indoor heat exchanger (37). At one end of the indoor circuit (22), a liquid side flare joint (38) to which the liquid side communication pipe (23) is connected is provided. The other end of the indoor circuit (22) is provided with a gas side flare joint (39) to which the gas side communication pipe (24) is connected.

室内熱交換器(37)は、クロスフィン式のフィン・アンド・チューブ型熱交換器として構成されている。この室内熱交換器(37)の近傍には、室内ファン(14)が設けられている。この室内熱交換器(37)では、室内ファン(14)によって送られる室内空気と流通する冷媒との間で熱交換が行われる。   The indoor heat exchanger (37) is configured as a cross-fin type fin-and-tube heat exchanger. An indoor fan (14) is provided in the vicinity of the indoor heat exchanger (37). In the indoor heat exchanger (37), heat is exchanged between the indoor air sent by the indoor fan (14) and the circulating refrigerant.

−冷凍装置の運転動作−
次に、冷凍装置(10)の運転動作について説明する。この冷凍装置(10)は、四路切換弁(33)の切り換えによって冷房運転と暖房運転とが実行可能になっている。
-Operation of refrigeration equipment-
Next, the operation of the refrigeration apparatus (10) will be described. The refrigeration apparatus (10) can perform a cooling operation and a heating operation by switching the four-way switching valve (33).

<冷房運転>
冷房運転では、四路切換弁(33)が第2状態に設定される。そして、この状態で圧縮機(30)を運転すると、冷媒回路(20)では室外熱交換器(34)が凝縮器となって室内熱交換器(37)が蒸発器となる蒸気圧縮冷凍サイクルが行われる。なお、冷房運転では、膨張弁(36)の開度が適宜調節される。
<Cooling operation>
In the cooling operation, the four-way switching valve (33) is set to the second state. When the compressor (30) is operated in this state, a vapor compression refrigeration cycle in which the outdoor heat exchanger (34) serves as a condenser and the indoor heat exchanger (37) serves as an evaporator in the refrigerant circuit (20). Done. In the cooling operation, the opening degree of the expansion valve (36) is appropriately adjusted.

具体的に、圧縮機(30)から吐出された冷媒は、室外熱交換器(34)で室外空気と熱交換して凝縮する。室外熱交換器(34)で凝縮した冷媒は、膨張弁(36)を通過する際に減圧され、その後に室内熱交換器(37)で室内空気と熱交換して蒸発する。室内熱交換器(37)で蒸発した冷媒は、圧縮機(30)へ吸入されて圧縮される。   Specifically, the refrigerant discharged from the compressor (30) is condensed by exchanging heat with outdoor air in the outdoor heat exchanger (34). The refrigerant condensed in the outdoor heat exchanger (34) is depressurized when passing through the expansion valve (36), and then is evaporated by exchanging heat with indoor air in the indoor heat exchanger (37). The refrigerant evaporated in the indoor heat exchanger (37) is sucked into the compressor (30) and compressed.

<暖房運転>
暖房運転では、四路切換弁(33)が第1状態に設定される。そして、この状態で圧縮機(30)を運転すると、冷媒回路(20)では室外熱交換器(34)が蒸発器となって室内熱交換器(37)が凝縮器となる蒸気圧縮冷凍サイクルが行われる。なお、暖房運転においても、膨張弁(36)の開度が適宜調節される。
<Heating operation>
In the heating operation, the four-way switching valve (33) is set to the first state. When the compressor (30) is operated in this state, a vapor compression refrigeration cycle in which the outdoor heat exchanger (34) serves as an evaporator and the indoor heat exchanger (37) serves as a condenser in the refrigerant circuit (20). Done. In the heating operation, the opening degree of the expansion valve (36) is appropriately adjusted.

具体的に、圧縮機(30)から吐出された冷媒は、室内熱交換器(37)で室内空気と熱交換して凝縮する。室内熱交換器(37)で凝縮した冷媒は、膨張弁(36)を通過する際に減圧され、その後に室外熱交換器(34)で室外空気と熱交換して蒸発する。室外熱交換器(34)で蒸発した冷媒は、圧縮機(30)へ吸入されて圧縮される。   Specifically, the refrigerant discharged from the compressor (30) is condensed by exchanging heat with indoor air in the indoor heat exchanger (37). The refrigerant condensed in the indoor heat exchanger (37) is decompressed when passing through the expansion valve (36), and thereafter evaporates by exchanging heat with outdoor air in the outdoor heat exchanger (34). The refrigerant evaporated in the outdoor heat exchanger (34) is sucked into the compressor (30) and compressed.

−冷凍機油の回収方法−
次に、冷凍装置(10)のガス側連絡配管(24)及び液側連絡配管(23)から冷凍機油を回収する方法について説明する。この冷凍機油の回収方法は、室外ユニット(11)と室内ユニット(13)とを新たなユニットに更新する時にガス側連絡配管(24)及び液側連絡配管(23)をそのまま流用する場合や、冷媒回路(20)の冷媒を入れ換える場合に用いられる。この冷凍機油の回収方法では、第1工程、第2工程、及び第3工程が順次行われる。以下に各工程について説明する。
-Refrigerating machine oil recovery method-
Next, a method for recovering refrigerating machine oil from the gas side connecting pipe (24) and the liquid side connecting pipe (23) of the refrigeration apparatus (10) will be described. This refrigerating machine oil recovery method can be used when the outdoor unit (11) and the indoor unit (13) are replaced with new units when the gas side connecting pipe (24) and liquid side connecting pipe (23) are used as they are. Used when replacing the refrigerant in the refrigerant circuit (20). In this refrigerating machine oil recovery method, the first step, the second step, and the third step are sequentially performed. Each step will be described below.

<第1工程>
第1工程では、ガス側閉鎖弁(26)を閉じた状態にして液側閉鎖弁(25)を開いた状態にする。室外回路(21)の四路切換弁(33)や膨張弁(36)は、特に調節しないので、冷凍装置(10)の運転が終了した時の状態になっている。この状態では、ガス側サービスポート(28)は、ガス側連絡配管(24)、室内回路(22)、及び液側連絡配管(23)に連通し、さらに液側閉鎖弁(25)を介して室外回路(21)にも連通している。
<First step>
In the first step, the gas side closing valve (26) is closed and the liquid side closing valve (25) is opened. Since the four-way switching valve (33) and the expansion valve (36) of the outdoor circuit (21) are not particularly adjusted, they are in a state when the operation of the refrigeration apparatus (10) is finished. In this state, the gas side service port (28) communicates with the gas side communication pipe (24), the indoor circuit (22), and the liquid side communication pipe (23), and further via the liquid side shut-off valve (25). It also communicates with the outdoor circuit (21).

そして、図2に示すように、冷媒回収器(45)をガス側サービスポート(28)に接続する。なお、冷媒回収器(45)は、真空ポンプと回収容器を備える装置である。冷媒回収器(45)は、真空ポンプによって吸引した冷媒を回収容器に収容可能に構成されている。ガス側サービスポート(28)に冷媒回収器(45)を接続すると、冷媒回収器(45)の真空ポンプを運転させる。   Then, as shown in FIG. 2, the refrigerant recovery unit (45) is connected to the gas side service port (28). The refrigerant recovery unit (45) is a device that includes a vacuum pump and a recovery container. The refrigerant recovery unit (45) is configured so that the refrigerant sucked by the vacuum pump can be stored in the recovery container. When the refrigerant recovery unit (45) is connected to the gas side service port (28), the vacuum pump of the refrigerant recovery unit (45) is operated.

真空ポンプの運転前は、ガス側連絡配管(24)よりも室内回路(22)や液側連絡配管(23)の方に多くの液冷媒が存在しているのが通常である。この状態で真空ポンプを運転させると、冷媒回路(20)のうちガス側サービスポート(28)に連通する部分の冷媒がガス側サービスポート(28)に向かって移動する。そして、真空ポンプの運転に伴い、ガス側連絡配管(24)には、室内回路(22)や液側連絡配管(23)の冷媒がそのままの状態、又は気液二相の状態になって流入する。そして、ガス側連絡配管(24)に付着する冷凍機油が、液冷媒(気液二相の冷媒)に溶け込んだり、冷媒の流れに押し流されることによって剥がされる。剥がされた冷凍機油は、冷媒と共にガス側サービスポート(28)から回収される。第1工程における真空ポンプの運転は、所定時間(例えば1分間)に亘って行われる。冷媒回路(20)のうちガス側サービスポート(28)に連通する部分の冷媒の全てを回収してしまわないように、真空ポンプの運転時間は設定される。第1工程の終了時点では、冷媒回路(20)のうち液側連絡配管(23)、室内回路(22)、及びガス側連絡配管(24)に冷媒が残存している状態になる。   Before the operation of the vacuum pump, it is normal that more liquid refrigerant is present in the indoor circuit (22) and the liquid side connection pipe (23) than in the gas side connection pipe (24). When the vacuum pump is operated in this state, the refrigerant in the portion of the refrigerant circuit (20) communicating with the gas side service port (28) moves toward the gas side service port (28). And with the operation of the vacuum pump, the refrigerant in the indoor circuit (22) and the liquid side communication pipe (23) flows into the gas side communication pipe (24) as it is or in a gas-liquid two-phase state. To do. Then, the refrigerating machine oil adhering to the gas side communication pipe (24) dissolves in the liquid refrigerant (gas-liquid two-phase refrigerant) or is pushed away by the refrigerant flow. The peeled refrigeration oil is collected from the gas side service port (28) together with the refrigerant. The operation of the vacuum pump in the first step is performed for a predetermined time (for example, 1 minute). The operation time of the vacuum pump is set so as not to collect all of the refrigerant in the refrigerant circuit (20) that communicates with the gas-side service port (28). At the end of the first step, the refrigerant remains in the liquid side communication pipe (23), the indoor circuit (22), and the gas side communication pipe (24) in the refrigerant circuit (20).

<第2工程>
第2工程では、上記第1工程と同様に、ガス側閉鎖弁(26)を閉じた状態にして液側閉鎖弁(25)を開いた状態にする。この状態では、液側サービスポート(27)は、閉鎖弁(25)の閉鎖位置の両側に連通している。つまり、液側サービスポート(27)は、液側連絡配管(23)、室内回路(22)、及びガス側連絡配管(24)に連通し、さらに室外回路(21)にも連通している。そして、図3に示すように、ガス側サービスポート(28)から取り外した冷媒回収器(45)を液側サービスポート(27)に接続し、冷媒回収器(45)の真空ポンプを運転させる。
<Second process>
In the second step, similarly to the first step, the gas side closing valve (26) is closed and the liquid side closing valve (25) is opened. In this state, the liquid side service port (27) communicates with both sides of the closing position of the closing valve (25). That is, the liquid side service port (27) communicates with the liquid side communication pipe (23), the indoor circuit (22), and the gas side communication pipe (24), and further communicates with the outdoor circuit (21). Then, as shown in FIG. 3, the refrigerant recovery unit (45) removed from the gas side service port (28) is connected to the liquid side service port (27), and the vacuum pump of the refrigerant recovery unit (45) is operated.

真空ポンプを運転させると、冷媒回路(20)のうち液側サービスポート(27)に連通する部分の冷媒が液側サービスポート(27)に向かって移動する。そして、真空ポンプの運転に伴い、液側連絡配管(23)には、室内回路(22)やガス側連絡配管(24)の液冷媒(気液二相の冷媒)が流入する。そして、液側連絡配管(23)に付着する冷凍機油が、液冷媒(気液二相の冷媒)に溶け込んだり、冷媒の流れに押し流されることによって剥がされる。剥がされた冷凍機油は、冷媒と共に液側サービスポート(27)から回収される。第2工程では、ガス側閉鎖弁(26)及び液側閉鎖弁(25)よりも室内ユニット(13)側のほとんどの冷媒が回収されるように、液側サービスポート(27)で計測する圧力が所定の第1圧力値以下になるまで真空ポンプの運転が行われる。   When the vacuum pump is operated, a part of the refrigerant communicating with the liquid service port (27) in the refrigerant circuit (20) moves toward the liquid service port (27). Then, along with the operation of the vacuum pump, the liquid refrigerant (gas-liquid two-phase refrigerant) in the indoor circuit (22) and the gas side communication pipe (24) flows into the liquid side communication pipe (23). The refrigerating machine oil adhering to the liquid side communication pipe (23) is peeled off by being dissolved in the liquid refrigerant (gas-liquid two-phase refrigerant) or being pushed away by the flow of the refrigerant. The peeled refrigeration oil is collected from the liquid side service port (27) together with the refrigerant. In the second step, the pressure measured at the liquid side service port (27) so that most of the refrigerant on the indoor unit (13) side is recovered from the gas side closing valve (26) and the liquid side closing valve (25). The vacuum pump is operated until becomes below a predetermined first pressure value.

<第3工程>
第3工程では、第1作業と第2作業とが行われる。第1作業では、上記第1工程及び第2工程と同様に、ガス側閉鎖弁(26)を閉じた状態にして液側閉鎖弁(25)を開いた状態にする。そして、液側サービスポート(27)から取り外した冷媒回収器(45)を熱源側ポート(9)に接続し、冷媒回収器(45)の真空ポンプを運転させる。真空ポンプを運転させると、室外回路(21)の冷媒が回収される。第1作業では、熱源側ポート(9)で計測する圧力が第1圧力値よりも小さい所定の第2圧力値以下になるまで真空ポンプの運転が行われる。
<Third process>
In the third step, the first work and the second work are performed. In the first operation, similarly to the first step and the second step, the gas side closing valve (26) is closed and the liquid side closing valve (25) is opened. Then, the refrigerant recovery unit (45) removed from the liquid side service port (27) is connected to the heat source side port (9), and the vacuum pump of the refrigerant recovery unit (45) is operated. When the vacuum pump is operated, the refrigerant in the outdoor circuit (21) is recovered. In the first operation, the vacuum pump is operated until the pressure measured at the heat source side port (9) is equal to or lower than a predetermined second pressure value smaller than the first pressure value.

ここで、第1作業だけでは、室外回路(21)のうち圧縮機(30)よりもガス側閉鎖弁(26)側の冷媒、すなわち四路切換弁(33)が第1状態の場合は圧縮機(30)の吐出口とガス側閉鎖弁(26)との間の冷媒、四路切換弁(33)が第2状態の場合は圧縮機(30)の吸入口とガス側閉鎖弁(26)との間の冷媒を回収しきれない虞があるので第2作業を行う。第2作業では、熱源側ポート(9)から取り外した冷媒回収器(45)をガス側サービスポート(28)に接続する。そして、ガス側閉鎖弁(26)を閉じて液側閉鎖弁(25)を開いた状態から徐々にガス側閉鎖弁(26)を開きながら真空ポンプを運転させる。真空ポンプを運転させると、第1作業後に室外回路(21)に残る冷媒が回収される。第2作業では、ガス側サービスポート(28)で計測する圧力が第2圧力値よりも小さい所定の第3圧力値以下になるまで真空ポンプの運転が行われる。これにより、室外回路(21)のほとんどの冷媒が回収される。   Here, only in the first operation, the refrigerant on the gas side closing valve (26) side of the compressor (30) in the outdoor circuit (21), that is, the four-way switching valve (33) is compressed in the first state. When the four-way switching valve (33) is in the second state, the refrigerant between the discharge port of the compressor (30) and the gas side shut-off valve (26), and the gas-side shut-off valve (26 ), The second operation is performed. In the second operation, the refrigerant recovery unit (45) removed from the heat source side port (9) is connected to the gas side service port (28). Then, the vacuum pump is operated while the gas side closing valve (26) is gradually opened from the state where the gas side closing valve (26) is closed and the liquid side closing valve (25) is opened. When the vacuum pump is operated, the refrigerant remaining in the outdoor circuit (21) after the first work is recovered. In the second operation, the vacuum pump is operated until the pressure measured at the gas-side service port (28) is equal to or lower than a predetermined third pressure value smaller than the second pressure value. Thereby, most of the refrigerant in the outdoor circuit (21) is recovered.

なお、第2作業をガス側閉鎖弁(26)を徐々に開きながら行うのは、室外回路(21)の冷媒や冷凍機油がガス側連絡配管(24)に流入しないようにするためである。つまり、第1作業後は、ガス側閉鎖弁(26)を挟んでガス側連絡配管(24)側が室外回路(21)側よりも低圧になっている虞がある。そして、この場合に、ガス側閉鎖弁(26)を急激に開くと、せっかく冷媒や冷凍機油を回収したガス側連絡配管(24)に室外回路(21)の冷媒や冷凍機油が流入してしまので、ガス側閉鎖弁(26)を徐々に開きながら第2作業を行う。   The reason why the second operation is performed while the gas side shut-off valve (26) is gradually opened is to prevent the refrigerant and refrigerating machine oil in the outdoor circuit (21) from flowing into the gas side connecting pipe (24). That is, after the first operation, there is a possibility that the gas side communication pipe (24) side is at a lower pressure than the outdoor circuit (21) side across the gas side shut-off valve (26). In this case, if the gas side shut-off valve (26) is suddenly opened, the refrigerant or refrigerating machine oil in the outdoor circuit (21) flows into the gas side connecting pipe (24) where the refrigerant or refrigerating machine oil has been collected. Therefore, the second operation is performed while the gas side closing valve (26) is gradually opened.

本実施形態では、第1工程及び第2工程において各連絡配管(23,24)では、近い側のポート(27,28)から冷媒を吸い出す場合の方がエネルギーロスが小さいので冷媒の流速が大きくなる。従って、ガス側連絡配管(24)に付着する冷媒は、ガス側サービスポート(28)から冷媒を吸い出す第1工程の際に多く剥がされ、液側連絡配管(23)に付着する冷媒は液側サービスポート(27)から冷媒を吸い出す第2工程の際に多く剥がされる。この実施形態では、第1工程と第2工程とで別々のポート(27,28)から冷媒を吸い出すことで、それぞれの連絡配管(27,28)で比較的多くの冷凍機油が剥がされるようにしている。   In this embodiment, in each of the connecting pipes (23, 24) in the first step and the second step, the energy loss is smaller when the refrigerant is sucked out from the ports (27, 28) on the near side, so the flow rate of the refrigerant is larger. Become. Therefore, much of the refrigerant adhering to the gas side connecting pipe (24) is peeled off during the first step of sucking out the refrigerant from the gas side service port (28), and the refrigerant adhering to the liquid side connecting pipe (23) is liquid side. A large amount is peeled off during the second step of sucking out the refrigerant from the service port (27). In this embodiment, the refrigerant is sucked out from the separate ports (27, 28) in the first step and the second step so that a relatively large amount of refrigerating machine oil is peeled off in the respective connecting pipes (27, 28). ing.

また、本実施形態では、第1工程でガス側閉鎖弁(26)を閉じた状態にするので、室外回路(21)の冷媒がガス側閉鎖弁(26)を通ってガス側サービスポート(28)から吸い出されることはない。また、第1工程で液側閉鎖弁(25)を開いた状態にしているので、室外回路(21)の冷媒が液側閉鎖弁(25)を通って室内ユニット(13)側に流入する。従って、液側閉鎖弁(25)を閉じた状態で第1工程を行う場合に比べて、第1工程及び第2工程でガス側サービスポート(28)と液側サービスポート(27)の間の室内ユニット(13)側を行き来する冷媒量が増加する。   In this embodiment, since the gas side shut-off valve (26) is closed in the first step, the refrigerant in the outdoor circuit (21) passes through the gas side shut-off valve (26) and passes through the gas side service port (28 ) Will not be sucked out. Moreover, since the liquid side closing valve (25) is opened in the first step, the refrigerant in the outdoor circuit (21) flows into the indoor unit (13) through the liquid side closing valve (25). Therefore, compared with the case where the first step is performed with the liquid side closing valve (25) closed, the gas side service port (28) and the liquid side service port (27) are separated in the first step and the second step. The amount of refrigerant going back and forth on the indoor unit (13) side increases.

−実施形態の効果−
本実施形態では、第1工程でガス側サービスポート(28)から冷媒を吸い出して主にガス側連絡配管(24)に付着する冷凍機油を剥がし、第2工程で液側サービスポート(27)から冷媒を吸い出して主に液側連絡配管(23)に付着する冷凍機油を剥がすようにしている。つまり、何れかのポート(27,28)から全ての冷媒を吸い出す場合は、吸い出すポート(27,28)とは逆側の連絡配管(23,24)の冷凍機油が回収されにくいが、ガス側サービスポート(28)から冷媒を吸い出す第1工程と液側サービスポート(27)から冷媒を吸い出す第2工程とを行うので、それぞれの連絡配管(23,24)から比較的多くの冷凍機油を回収することができる。また、冷凍機油の回収量を増加させるために冷媒充填作業を行う従来の方法では少なくとも3回以上の作業が必要となるが、本発明の方法では第1工程及び第2工程の2回の作業でガス側連絡配管(24)及び液側連絡配管(23)の冷凍機油を効率的に回収することができる。しかも、冷媒を充填しない分回収する冷媒量が少なくなるので、冷媒の回収に要する時間を短縮化することができる。従って、冷凍機油を効率的に回収しつつ回収する手間を軽減させることができる。
-Effect of the embodiment-
In this embodiment, the refrigerant is sucked out from the gas side service port (28) in the first step, and the refrigerating machine oil adhering mainly to the gas side communication pipe (24) is peeled off, and from the liquid side service port (27) in the second step. Refrigerating machine oil that sucks out the refrigerant and adheres mainly to the liquid side communication pipe (23) is peeled off. In other words, when all the refrigerant is sucked out from one of the ports (27, 28), the refrigeration oil in the connecting pipe (23, 24) on the opposite side of the sucking out port (27, 28) is difficult to recover, but the gas side Since the first step of sucking refrigerant from the service port (28) and the second step of sucking refrigerant from the liquid side service port (27) are performed, a relatively large amount of refrigerating machine oil is recovered from each connecting pipe (23, 24). can do. In addition, in the conventional method in which the refrigerant filling operation is performed in order to increase the recovered amount of refrigerating machine oil, at least three operations are required. In the method of the present invention, the operations in the first step and the second step are performed twice. Thus, the refrigeration oil in the gas side connecting pipe (24) and the liquid side connecting pipe (23) can be efficiently recovered. In addition, since the amount of refrigerant to be collected is reduced by the amount not filled with the refrigerant, the time required for collecting the refrigerant can be shortened. Therefore, it is possible to reduce the trouble of collecting the refrigerating machine oil while efficiently collecting it.

なお、本実施形態では、冷媒回路(20)の冷媒を室外回路(21)に集めるポンプダウンを行う必要がない。また、ポンプダウンを行わないので、圧縮機(30)が故障している場合でも冷凍機油を回収する作業を行うことができる。   In the present embodiment, there is no need to perform pump down to collect the refrigerant in the refrigerant circuit (20) in the outdoor circuit (21). Moreover, since pump down is not performed, the operation | work which collect | recovers refrigeration oil can be performed even when the compressor (30) has failed.

また、本実施形態では、第1工程において、ガス側閉鎖弁(26)を閉じた状態にすることで、室外回路(21)の冷媒がガス側閉鎖弁(26)を通ってガス側サービスポート(28)から吸い出されることはないようにしている。従って、ガス側閉鎖弁(26)を開いた状態で第1工程を行う場合に比べて、ガス側連絡配管(24)での冷媒の流速が大きくなるので、ガス側連絡配管(24)から剥がされて回収される冷凍機油の量が多くなる。   In the present embodiment, in the first step, the gas side shut-off valve (26) is closed, so that the refrigerant in the outdoor circuit (21) passes through the gas side shut-off valve (26). (28) is not sucked out. Therefore, compared with the case where the first step is performed with the gas side shut-off valve (26) opened, the flow rate of the refrigerant in the gas side communication pipe (24) is increased, so that the gas side connection pipe (24) is peeled off. As a result, the amount of refrigerating machine oil recovered is increased.

また、本実施形態では、液側閉鎖弁(25)を開いた状態で第1工程を行うことで、膨張弁(36)が開いていればレシーバ(39)に溜まった液冷媒が液側連絡配管(23)へ流入する場合がある。そして、第1工程及び第2工程においてガス側サービスポート(28)と液側サービスポート(27)の間の室内ユニット(13)側を行き来する冷媒量が増加する。すなわち、ガス側連絡配管(24)及び液側連絡配管(23)を流通する冷媒の合計量が増加する。従って、ガス側連絡配管(24)及び液側連絡配管(23)からさらに多くの冷凍機油を剥がして回収することができる。   Further, in the present embodiment, by performing the first step with the liquid side closing valve (25) opened, the liquid refrigerant accumulated in the receiver (39) communicates with the liquid side if the expansion valve (36) is open. May flow into pipe (23). In the first step and the second step, the amount of refrigerant going back and forth on the indoor unit (13) side between the gas side service port (28) and the liquid side service port (27) increases. That is, the total amount of refrigerant flowing through the gas side connecting pipe (24) and the liquid side connecting pipe (23) increases. Therefore, more refrigeration oil can be peeled off from the gas side connecting pipe (24) and the liquid side connecting pipe (23) and recovered.

また、本実施形態では、室外回路(21)の冷媒が回収する第3工程を行うことで、この冷凍機油の回収方法を行った後に室外回路(21)に残る冷媒が少なくなるようにしている。特に、この実施形態では、第3工程において室外回路(21)の冷媒を熱源側ポート(9)から回収する第1作業、及びガス側サービスポート(28)から回収する第2作業を行うことで、室外回路(21)の冷媒が確実に回収される。従って、室外ユニット(11)を更新する場合は、撤去した室外ユニット(11)から冷媒を回収する手間を省略することができる。また、冷媒回路(20)の冷媒を入れ換える場合は、冷凍装置(10)の信頼性を向上させることができる。   In the present embodiment, the third step of collecting the refrigerant in the outdoor circuit (21) is performed, so that the refrigerant remaining in the outdoor circuit (21) is reduced after the refrigerating machine oil collecting method is performed. . In particular, in this embodiment, in the third step, the first operation of recovering the refrigerant of the outdoor circuit (21) from the heat source side port (9) and the second operation of recovering from the gas side service port (28) are performed. The refrigerant in the outdoor circuit (21) is reliably recovered. Therefore, when updating the outdoor unit (11), the trouble of collecting the refrigerant from the removed outdoor unit (11) can be omitted. Further, when replacing the refrigerant in the refrigerant circuit (20), the reliability of the refrigeration apparatus (10) can be improved.

また、本実施形態では、第3工程においてガス側サービスポート(28)から室外回路(21)の冷媒を回収する作業をガス側閉鎖弁(26)を徐々に開きながら行うことで、室外回路(21)の冷媒や冷凍機油が、冷媒及び冷凍機油が回収されたガス側連絡配管(24)へ流入しないようにしている。従って、第3工程後にガス側連絡配管(24)から冷媒や冷凍機油を回収することが必要な状態になることを回避することができる。   In the present embodiment, the operation of recovering the refrigerant in the outdoor circuit (21) from the gas-side service port (28) in the third step is performed while the gas-side shut-off valve (26) is gradually opened. The refrigerant and refrigerating machine oil of 21) are prevented from flowing into the gas side communication pipe (24) from which the refrigerant and refrigerating machine oil have been recovered. Accordingly, it is possible to avoid a state in which it is necessary to recover the refrigerant and the refrigerating machine oil from the gas side communication pipe (24) after the third step.

−実施形態の変形例−
実施形態の変形例について説明する。この変形例は、熱源側ポート(9)が設けられていない冷凍装置(10)の場合の冷凍機油の回収方法である。第1工程と第2工程とを行うのは上記実施形態と同じであるが、第3工程では第2作業のみが行われる。第2作業では、液側サービスポート(27)から取り外した冷媒回収器(45)をガス側サービスポート(28)に接続する。そして、ガス側閉鎖弁(26)を閉じて液側閉鎖弁(25)を開いた状態から徐々にガス側閉鎖弁(26)を開きながら真空ポンプを運転させる。
-Modification of the embodiment-
A modification of the embodiment will be described. This modification is a method for recovering refrigeration oil in the case of a refrigeration apparatus (10) that is not provided with a heat source side port (9). Although the first step and the second step are the same as those in the above embodiment, only the second operation is performed in the third step. In the second operation, the refrigerant recovery unit (45) removed from the liquid side service port (27) is connected to the gas side service port (28). Then, the vacuum pump is operated while the gas side closing valve (26) is gradually opened from the state where the gas side closing valve (26) is closed and the liquid side closing valve (25) is opened.

《その他の実施形態》
上記実施形態については、以下のような構成としてもよい。
<< Other Embodiments >>
About the said embodiment, it is good also as the following structures.

上記実施形態では、第1工程において、所定時間に亘って真空ポンプを運転させていたが、ガス側サービスポート(28)で計測する圧力が所定の圧力値以下になるまで真空ポンプを運転させるようにしてもよい。   In the above embodiment, the vacuum pump is operated for a predetermined time in the first step, but the vacuum pump is operated until the pressure measured at the gas-side service port (28) becomes a predetermined pressure value or less. It may be.

また、上記実施形態について、液側閉鎖弁(25)を閉じた状態で第1工程を行ってもよい。また、第2工程も液側閉鎖弁(25)を閉じた状態で行ってもよい。   Moreover, about the said embodiment, you may perform a 1st process in the state which closed the liquid side closing valve (25). Moreover, you may perform a 2nd process in the state which closed the liquid side closing valve (25).

また、上記実施形態について、ガス側閉鎖弁(26)を開いた状態で第1工程を行ってもよい。   Moreover, about the said embodiment, you may perform a 1st process in the state which opened the gas side closing valve (26).

また、上記実施形態について、第3工程において第1作業と第2作業とを同時に行うようにしてもよい。具体的に、熱源側ポート(9)とガス側サービスポート(28)とには別々の冷媒回収器(45)が接続される。そして、ガス側閉鎖弁(26)を閉じて液側閉鎖弁(25)を開いた状態から徐々にガス側閉鎖弁(26)を開きながら、両方の冷媒回収器(45)の真空ポンプを運転させる。また、第2作業を行った後に第1作業を行うようにしてもよい。   Moreover, about the said embodiment, you may make it perform a 1st operation | work and a 2nd operation | work simultaneously in a 3rd process. Specifically, separate refrigerant recovery units (45) are connected to the heat source side port (9) and the gas side service port (28). Then, the vacuum pumps of both refrigerant recovery units (45) are operated while the gas side closing valve (26) is gradually opened from the state where the gas side closing valve (26) is closed and the liquid side closing valve (25) is opened. Let Further, the first work may be performed after the second work is performed.

また、上記実施形態について、膨張弁(18)を強制的に開いた状態にしてから第1工程を行うようにしてもよい。この場合、膨張弁(18)を閉じた状態で第1工程を行う場合に比べて、第1工程及び第2工程でガス側サービスポート(28)と液側サービスポート(27)の間の室内ユニット(13)側を行き来する冷媒量が増加する。   In the above embodiment, the first step may be performed after the expansion valve (18) is forcibly opened. In this case, the chamber between the gas side service port (28) and the liquid side service port (27) in the first step and the second step is compared with the case where the first step is performed with the expansion valve (18) closed. The amount of refrigerant going back and forth on the unit (13) side increases.

なお、以上の実施形態は、本質的に好ましい例示であって、本発明、その適用物、あるいはその用途の範囲を制限することを意図するものではない。   In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

以上説明したように、本発明は、熱源ユニットと利用ユニットとがガス側連絡配管及び液側連絡配管で接続されて構成された冷媒回路を備える冷凍装置について、そのガス側連絡配管及び液側連絡配管から冷凍機油を回収する冷凍機油の回収方法について有用である。   As described above, the present invention relates to a refrigeration apparatus having a refrigerant circuit in which a heat source unit and a utilization unit are connected by a gas side communication pipe and a liquid side communication pipe. This is useful for a method of recovering refrigeration oil that recovers refrigeration oil from piping.

本発明の実施形態に係る冷凍装置の概略構成図である。1 is a schematic configuration diagram of a refrigeration apparatus according to an embodiment of the present invention. 実施形態における冷凍装置の第1工程時の概略構成図である。It is a schematic block diagram at the time of the 1st process of the freezing apparatus in embodiment. 実施形態における冷凍装置の第2工程時の概略構成図である。It is a schematic block diagram at the time of the 2nd process of the freezing apparatus in embodiment.

符号の説明Explanation of symbols

9 熱源側ポート
10 冷凍装置
11 室外ユニット(熱源ユニット)
13 室内ユニット(室内ユニット)
20 冷媒回路
21 室外回路(熱源側回路)
22 室内回路(利用側回路)
23 液側連絡配管
24 ガス側連絡配管
25 液側閉鎖弁
26 ガス側閉鎖弁
27 液側サービスポート(液側ポート)
28 ガス側サービスポート(ガス側ポート)
9 Heat source side port
10 Refrigeration equipment
11 Outdoor unit (heat source unit)
13 Indoor unit (indoor unit)
20 Refrigerant circuit
21 Outdoor circuit (heat source side circuit)
22 Indoor circuit (use side circuit)
23 Liquid side connection piping
24 Gas side communication piping
25 Liquid side stop valve
26 Gas side shut-off valve
27 Liquid side service port (Liquid side port)
28 Gas side service port (gas side port)

Claims (6)

熱源ユニット(11)内の熱源側回路(21)と利用ユニット(13)内の利用側回路(22)とがガス側連絡配管(24)及び液側連絡配管(23)で接続されて構成された冷媒回路(20)で冷凍サイクルを行う冷凍装置(10)について、該ガス側連絡配管(24)及び液側連絡配管(23)から冷凍機油を回収する方法であって、
上記熱源側回路(21)の一端に設けられたガス側閉鎖弁(26)の閉鎖位置のガス側連絡配管(24)側に開口するガス側ポート(28)から、上記冷媒回路(20)のうち該ガス側ポート(28)に連通する部分の冷媒の一部と共に冷凍機油を回収する第1工程と、
上記ガス側閉鎖弁(26)を閉じた状態で、上記熱源側回路(21)の他端に設けられた液側閉鎖弁(25)の閉鎖位置の液側連絡配管(23)側に開口する液側ポート(27)から、上記冷媒回路(20)のうち該液側ポート(27)に連通する部分の冷媒の一部又は全部と共に冷凍機油を回収する第2工程とを順に行うことを特徴とする冷凍機油の回収方法。
The heat source side circuit (21) in the heat source unit (11) and the usage side circuit (22) in the usage unit (13) are connected by the gas side communication pipe (24) and the liquid side communication pipe (23). A refrigerant circuit (20) for performing a refrigeration cycle, wherein the refrigeration oil is recovered from the gas side connection pipe (24) and the liquid side connection pipe (23),
From the gas side port (28) opened to the gas side connecting pipe (24) side of the gas side closing valve (26) provided at one end of the heat source side circuit (21), the refrigerant circuit (20) A first step of recovering the refrigerating machine oil together with a part of the refrigerant communicating with the gas side port (28),
With the gas side shutoff valve (26) closed, the liquid side shutoff valve (25) provided at the other end of the heat source side circuit (21) opens to the liquid side connecting pipe (23) side of the closed position. From the liquid side port (27), the second step of collecting the refrigerating machine oil together with part or all of the refrigerant in the refrigerant circuit (20) communicating with the liquid side port (27) is sequentially performed. Refrigerating machine oil recovery method.
請求項1において、
上記ガス側閉鎖弁(26)を閉じた状態で上記第1工程を行うことを特徴とする冷凍機油の回収方法。
In claim 1,
The method for recovering refrigerating machine oil, wherein the first step is performed with the gas side shut-off valve (26) closed.
請求項1又は2において、
上記液側閉鎖弁(25)を開いた状態で上記第1工程及び第2工程を行うことを特徴とする冷凍機油の回収方法。
In claim 1 or 2,
A method for recovering refrigerating machine oil, wherein the first step and the second step are performed in a state where the liquid side closing valve (25) is opened.
請求項1乃至3の何れか1つにおいて、
上記第2工程の終了後に上記熱源側回路(21)の冷媒を回収する第3工程を行うことを特徴とする冷凍機油の回収方法。
In any one of Claims 1 thru | or 3,
A method for recovering refrigerating machine oil, comprising performing a third step of recovering the refrigerant of the heat source side circuit (21) after completion of the second step.
請求項4において、
上記第3工程では、上記ガス側閉鎖弁(26)を徐々に開きながらガス側ポート(28)から上記熱源側回路(21)の冷媒を回収することを特徴とする冷凍機油の回収方法。
In claim 4,
In the third step, the refrigerant of the refrigerating machine oil is recovered by recovering the refrigerant of the heat source side circuit (21) from the gas side port (28) while gradually opening the gas side closing valve (26).
請求項4において、
上記第3工程では、上記熱源側回路(21)に開口する熱源側ポート(9)から該熱源側回路(21)の冷媒を回収する作業と、上記ガス側閉鎖弁(26)を徐々に開きながらガス側ポート(28)から該熱源側回路(21)の冷媒を回収する作業とを行うことを特徴とする冷凍機油の回収方法。
In claim 4,
In the third step, the operation of recovering the refrigerant of the heat source side circuit (21) from the heat source side port (9) that opens to the heat source side circuit (21), and the gas side shut-off valve (26) are gradually opened. A method for recovering refrigerating machine oil, comprising: performing an operation of recovering the refrigerant of the heat source side circuit (21) from the gas side port (28).
JP2006046343A 2006-02-23 2006-02-23 Refrigerating machine oil recovery method Active JP3956997B1 (en)

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AU2007225990A AU2007225990B2 (en) 2006-02-23 2007-02-20 Method for the recovery of refrigeration oil
EP07714564A EP1992893A4 (en) 2006-02-23 2007-02-20 Method of recovering refrigerator oil
PCT/JP2007/053061 WO2007105425A1 (en) 2006-02-23 2007-02-20 Method of recovering refrigerator oil
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EP3935126A1 (en) 2019-03-08 2022-01-12 The Chemours Company FC, LLC Process and methods for reclaiming flammable and non-flammable hydrofluoro-olefin containing refrigerants

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JP3050824B2 (en) * 1997-01-08 2000-06-12 仁吉 合澤 Method for recovering refrigerant in heat exchanger and method for resupplying refrigerant
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JP2003194437A (en) * 2001-12-25 2003-07-09 Daikin Ind Ltd Bottom oil recovery method
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JPWO2017199345A1 (en) * 2016-05-17 2018-09-06 三菱電機株式会社 Air conditioner

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