JP2014085082A - Refrigerant processor - Google Patents

Refrigerant processor Download PDF

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JP2014085082A
JP2014085082A JP2012236269A JP2012236269A JP2014085082A JP 2014085082 A JP2014085082 A JP 2014085082A JP 2012236269 A JP2012236269 A JP 2012236269A JP 2012236269 A JP2012236269 A JP 2012236269A JP 2014085082 A JP2014085082 A JP 2014085082A
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refrigerant
recovery
pressure
compressor
opening
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JP6055647B2 (en
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Takehiro Kobayashi
丈博 小林
Ryo Matsuzaki
亮 松崎
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MK Seiko Co Ltd
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MK Seiko Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant processor which prevents breakage of a compressor and inflow of ice machine oil into a refrigerant recovery tank by preventing inflow of liquid refrigerant from an oil separator into the compressor.SOLUTION: In a recovery passage between an air-conditioning system U and a refrigerant recovery tank 14, the refrigerant processor comprises: an on-off valve 19 for opening and closing the passage; a pressure sensor 10 for detecting pressure in the passage; an oil separator 9 for removing an oil content from recovered refrigerant; and a compressor 12 for recovering refrigerant. A load cell 18 for detecting a refrigerant recovery amount is disposed at the refrigerant recovery tank 14. A control part 23 closes the on-off valve 19 when the refrigerant recovery amount detected by the load cell 18 reaches a predetermined value, and opens the on-off valve when the pressure detected by the pressure sensor 10 decreases to a predetermined value, and continues these opening and closing operations. When the pressure sensor 10 shows a target value of recovery in a recovery state with the on-off valve open, the control part 23 stops the compressor 12.

Description

本発明は、空調システム内に充填されている冷媒を回収し、回収した冷媒から油分を除去して再生処理する冷媒処理装置に関するものである。   The present invention relates to a refrigerant processing apparatus that recovers a refrigerant filled in an air conditioning system, removes oil from the recovered refrigerant, and performs a regeneration process.

この種の装置として、特許文献１が知られている。特許文献１に示す冷媒処理装置は、車両用空調システムに接続し、内蔵されるコンプレッサ・オイルセパレータ・冷媒回収タンクによって、車両用空調システムから冷媒を回収して再生する回収再生作業を実行するものである。   Patent Document 1 is known as this type of device. The refrigerant processing apparatus shown in Patent Literature 1 is connected to a vehicle air conditioning system, and performs a recovery and regeneration operation for recovering and regenerating the refrigerant from the vehicle air conditioning system by a built-in compressor, oil separator, and refrigerant recovery tank. It is.

回収再生作業は、車両エンジンを停止した状態で、車両用空調システムの高圧サービスバルブ及び低圧サービスバルブに装置本体の高圧ホース及び低圧ホースを接続してコンプレッサを駆動させることで実行され、コンプレッサの駆動に伴い車両用空調システムの冷媒がオイルセパレータで冷凍機油が分離された後、冷媒回収タンクに回収される。   The recovery and regeneration work is performed by connecting the high-pressure hose and low-pressure hose of the device body to the high-pressure service valve and low-pressure service valve of the vehicle air conditioning system and driving the compressor with the vehicle engine stopped. Accordingly, the refrigerant of the vehicle air conditioning system is recovered in the refrigerant recovery tank after the refrigeration oil is separated by the oil separator.

車両用空調システムから高圧液体の状態で回収された冷媒は、オイルセパレータに導入されると減圧気化することで冷凍機油が分離され、コンプレッサで圧縮されることで再度液化して冷媒回収タンクに貯留される。ここで、オイルセパレータに処理能力以上の液体冷媒が導入されると、液体冷媒が減圧気化されずに液体のままオイルセパレータに滞留することになり、オイルセパレータの容量を超えて滞留した液体冷媒がコンプレッサに流入し、コンプレッサを破損させたり、冷凍機油が分離されない冷媒が冷媒回収タンクに回収されるといった不具合が生じてしまう。   When the refrigerant recovered from the vehicle air conditioning system in the state of high-pressure liquid is introduced into the oil separator, it is evaporated under reduced pressure to separate the refrigerating machine oil, and is compressed by the compressor to be liquefied again and stored in the refrigerant recovery tank. Is done. Here, when a liquid refrigerant having a processing capacity or more is introduced into the oil separator, the liquid refrigerant will remain in the oil separator without being vaporized under reduced pressure, and the liquid refrigerant that has accumulated beyond the capacity of the oil separator will remain. Inflow into the compressor causes damage to the compressor, and refrigerant such that the refrigerant oil is not separated is recovered in the refrigerant recovery tank.

特開２００６−２２０３８１号公報JP 2006-220381 A

本発明は、オイルセパレータから液体冷媒がコンプレッサに流入することを防止し、コンプレッサの破損や冷媒回収タンクへの冷凍機油の混入をなくすことを目的としている。   An object of the present invention is to prevent liquid refrigerant from flowing into a compressor from an oil separator, and to eliminate damage to the compressor and mixing of refrigeration oil into a refrigerant recovery tank.

このような課題を解決するために本発明は、空調システムから冷媒回収タンクに至る回収流路に、該流路を開閉する開閉手段と、流路内の圧力を検出する圧力センサと、回収した冷媒から油分を除去するオイルセパレータと、冷媒を回収するコンプレッサとを配列した冷媒処理装置であって、冷媒回収タンクに冷媒回収量を検出する検出手段を備え、該検出手段で検出される冷媒回収量が所定値に達したら開閉手段を閉じる動作と、圧力センサで所定値まで圧力が低下したら開閉手段を開く動作を繰り返し、開閉手段が開いた回収状態で圧力センサが回収目標値に達したらコンプレッサを停止する制御手段を備えたものである。   In order to solve such a problem, the present invention collects an opening / closing means for opening and closing the flow path, a pressure sensor for detecting pressure in the flow path, and a recovery flow path from the air conditioning system to the refrigerant recovery tank. A refrigerant processing apparatus in which an oil separator that removes oil from the refrigerant and a compressor that collects the refrigerant are arranged, the refrigerant recovery tank includes a detection unit that detects a refrigerant recovery amount, and the refrigerant recovery detected by the detection unit The operation of closing the opening / closing means when the amount reaches a predetermined value and the operation of opening the opening / closing means when the pressure drops to the predetermined value by the pressure sensor are repeated, and when the pressure sensor reaches the recovery target value with the opening / closing means opened, the compressor Is provided with a control means for stopping the operation.

本発明の装置は以上のように構成されるので、冷媒回収量が所定値に達する毎に空調システムからの回収作業を一旦停止することで、オイルセパレータから液化した冷媒が溢れることが防止され、コンプレッサに液冷媒が流入することによる故障や冷凍機油が分離されない状態で回収タンクに混入することがなくなる。   Since the apparatus of the present invention is configured as described above, by temporarily stopping the recovery operation from the air conditioning system every time the refrigerant recovery amount reaches a predetermined value, it is possible to prevent the liquefied refrigerant from overflowing from the oil separator, There will be no troubles due to the flow of liquid refrigerant into the compressor and no mixing of the refrigerating machine oil into the recovery tank without separation.

本発明の冷媒処理装置の全体構成図である。It is a whole block diagram of the refrigerant processing apparatus of this invention. 同装置のブロック図である。It is a block diagram of the same apparatus. 冷媒回収の動作を示すフローチャート図である。It is a flowchart figure which shows the operation | movement of refrigerant | coolant collection | recovery. 冷媒回収の冷媒の流れを示す説明図である。It is explanatory drawing which shows the flow of the refrigerant | coolant of refrigerant | coolant collection | recovery.

以下、図面を用いて本発明の冷媒処理装置について説明する。図１は本発明の冷媒処理装置を示す全体構成図である。
１は装置本体で、車両用空調システムＵの高圧サービスバルブＶＨ及び低圧サービスバルブＶＬと接続する高圧ホース２及び低圧ホース３を延出している。高圧ホース２及び低圧ホース３は、一端に逆止弁付のカプラ４，５を備え、他端を装置本体１内の高圧管路６及び低圧管路７にそれぞれ接続している。高圧管路６は、高圧用圧力センサ８を備え、回収冷媒から冷凍機油を分離するオイルセパレータ９に接続している。低圧管路７は、低圧用圧力センサ１０を備え、接続管路１１を介して高圧用圧力センサ８とオイルセパレータ９間の高圧管路６に接続している。 Hereinafter, the refrigerant processing apparatus of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram showing a refrigerant processing apparatus of the present invention.
Reference numeral 1 denotes an apparatus main body, which extends a high pressure hose 2 and a low pressure hose 3 connected to the high pressure service valve VH and the low pressure service valve VL of the vehicle air conditioning system U. The high-pressure hose 2 and the low-pressure hose 3 include couplers 4 and 5 with check valves at one end, and the other ends are connected to the high-pressure line 6 and the low-pressure line 7 in the apparatus main body 1, respectively. The high-pressure line 6 includes a high-pressure sensor 8 and is connected to an oil separator 9 that separates refrigeration oil from the recovered refrigerant. The low-pressure line 7 includes a low-pressure sensor 10 and is connected to the high-pressure line 6 between the high-pressure sensor 8 and the oil separator 9 via a connection line 11.

１２はコンプレッサで、入力側をオイルセパレータ９内に接続し、出力側を供給管路１３を介して冷媒回収タンク１４に接続している。供給管路１３は、オイルセパレータ９内で熱交換するコンデンサ１５を経由し冷媒回収タンク１４に接続している。１６は冷凍機油受けで、オイルセパレータ９で分離された冷凍機油を排油パイプ１７を通じて排出される。１８はロードセルで、冷媒回収タンク１４に取り付けられ、タンク１４内に貯留される冷媒の重量を計量する。   A compressor 12 has an input side connected to the oil separator 9 and an output side connected to a refrigerant recovery tank 14 via a supply line 13. The supply line 13 is connected to the refrigerant recovery tank 14 via a condenser 15 that exchanges heat in the oil separator 9. A refrigerating machine oil receiver 16 discharges the refrigerating machine oil separated by the oil separator 9 through an oil discharge pipe 17. A load cell 18 is attached to the refrigerant recovery tank 14 and measures the weight of the refrigerant stored in the tank 14.

１９〜２１は管路開閉用の電磁弁で、高圧管路６における高圧用圧力センサ８とオイルセパレータ１１との間に電磁弁１９・低圧管路７における低圧ホース３の接続位置と低圧用圧力センサ１０との間に電磁弁２０・排油パイプ１７に電磁弁２１をそれぞれ配し、各管路を開閉する。   Reference numerals 19 to 21 are electromagnetic valves for opening and closing the pipe, and the position of the low pressure hose 3 in the electromagnetic valve 19 and the low pressure pipe 7 between the high pressure sensor 8 and the oil separator 11 in the high pressure pipe 6 and the pressure for low pressure. An electromagnetic valve 21 is disposed between the sensor 10 and the solenoid valve 20 and the oil drain pipe 17 to open and close each pipe line.

図２は本発明の冷媒処理装置の制御系を示すブロック図である。
２３は制御部で、高圧用圧力センサ８・低圧用圧力センサ１０・コンプレッサ１２・ロードセル１８・電磁弁１９〜２１・操作ボード２４が接続され、操作ボード２４からの指令に基づいて記憶されたプログラムを実行し、各センサ８・１０からの信号に応じて装置の各機器を作動させる。 FIG. 2 is a block diagram showing a control system of the refrigerant processing apparatus of the present invention.
A control unit 23 is connected to the high pressure sensor 8, the low pressure sensor 10, the compressor 12, the load cell 18, the solenoid valves 19 to 21, and the operation board 24, and is stored based on a command from the operation board 24. And each device of the apparatus is operated in accordance with signals from the sensors 8 and 10.

続いて、このように構成する冷媒処理装置の動作について説明する。
本装置では、コース選択キーで自動回収コースと手動回収コースが選択できるようになっている。このうち自動回収コースについて、図を用いて説明する。 Then, operation | movement of the refrigerant | coolant processing apparatus comprised in this way is demonstrated.
In this apparatus, an automatic collection course and a manual collection course can be selected with a course selection key. Of these, the automatic collection course will be described with reference to the drawings.

図３制御部２３における回収動作のフローチャート、図４は動作説明図である。
作業者は、準備作業として、車両エンジンを停止し、車両用空調システムＵの高圧サービスバルブＶＨ及び低圧サービスバルブＶＬに、装置本体１の高圧ホース２及び低圧ホース３をカプラ４・５によって接続する。この状態から操作ボード２４のスタートキーを入力すると図３に示すフローチャートに沿って回収動作が開始される。 FIG. 3 is a flowchart of the collection operation in the control unit 23, and FIG.
As a preparatory work, the operator stops the vehicle engine, and connects the high pressure hose 2 and the low pressure hose 3 of the apparatus main body 1 to the high pressure service valve VH and the low pressure service valve VL of the vehicle air conditioning system U by the couplers 4 and 5. . When the start key of the operation board 24 is input from this state, the collecting operation is started according to the flowchart shown in FIG.

回収動作が開始すると、高圧用圧力センサ８で高圧ホース２の圧力ＰＨを検出して高圧ホース２が確実に装着されていることを確認し（１）、所定値Ｐ１以上の圧力が検出されると、高圧管路６の電磁弁１９を開き（２）、コンプレッサ１２を駆動する（３）。コンプレッサ１２の駆動に伴い、車両用空調システムＵの冷媒は、高圧ホース２から高圧液体の状態で取り込まれ、オイルセパレータ９に導入される。オイルセパレータ９に導入された液体冷媒は、容器開放による減圧で気化し、含有する冷凍機油が分離される。オイルを分離した冷媒は、コンプレッサ１２で圧縮されて再度液化し、オイルセパレータ９に内蔵したコンデンサ１５を通過した後、冷媒回収タンク１４に回収される。オイルセパレータ９に内蔵したコンデンサ１５に液化冷媒を通すことで、オイルセパレータ９が加熱され、熱交換を促進することができる。   When the recovery operation starts, the pressure PH of the high-pressure hose 2 is detected by the high-pressure sensor 8 to confirm that the high-pressure hose 2 is securely attached (1), and a pressure equal to or higher than the predetermined value P1 is detected. Then, the electromagnetic valve 19 of the high pressure line 6 is opened (2), and the compressor 12 is driven (3). As the compressor 12 is driven, the refrigerant of the vehicle air conditioning system U is taken in from the high-pressure hose 2 in a high-pressure liquid state and introduced into the oil separator 9. The liquid refrigerant introduced into the oil separator 9 is vaporized by decompression by opening the container, and the refrigeration oil contained is separated. The refrigerant from which the oil has been separated is compressed by the compressor 12 and liquefied again, passes through the condenser 15 built in the oil separator 9, and is then collected in the refrigerant collection tank 14. By passing the liquefied refrigerant through the capacitor 15 built in the oil separator 9, the oil separator 9 is heated and heat exchange can be promoted.

次に、冷媒回収タンク１４に回収された冷媒量Ｓをロードセル１８で監視し（４）、オイルセパレータ９の容量未満に設定した所定量Ｓの回収を検出したら、開閉弁１９を閉じて（５）車両用空調システムＵからの回収を一旦停止する。これは、オイルセパレータ９に分離能力以上の冷媒が導入されると、オイルセパレータ９内で冷媒が気化されず液体のまま滞留することになり、滞留した液冷媒がオイルセパレータ９の容量を超えてコンプレッサ１２に流入してしまうことを防ぐためである。   Next, the refrigerant quantity S collected in the refrigerant collection tank 14 is monitored by the load cell 18 (4). When the collection of the predetermined quantity S set to be less than the capacity of the oil separator 9 is detected, the on-off valve 19 is closed (5 ) The collection from the vehicle air conditioning system U is temporarily stopped. This is because when the refrigerant having a separation capacity or more is introduced into the oil separator 9, the refrigerant stays in the liquid without being vaporized in the oil separator 9, and the retained liquid refrigerant exceeds the capacity of the oil separator 9. This is to prevent the air from flowing into the compressor 12.

車両用空調システムＵからの回収を一旦停止している間、低圧用圧力センサ１０で管路内の圧力を監視し（６）、圧力ＰＬが冷媒が液体とならない所定圧Ｐ２以下まで低下すると、オイルセパレータ９で液化することはないと判断し、処理（３）に戻って再び開閉弁１９を開き回収動作を再開する。   While the recovery from the vehicle air-conditioning system U is temporarily stopped, the pressure in the pipe line is monitored by the low-pressure sensor 10 (6), and when the pressure PL drops below a predetermined pressure P2 at which the refrigerant does not become liquid, It is determined that the oil separator 9 does not liquefy, and the process returns to the process (3) to open the on-off valve 19 again and resume the recovery operation.

処理（４）において、所定量Ｓの回収が検出されない場合は、低圧用圧力センサ１０で管路内の圧力を監視し（７）、検出される圧力ＰＬが所定圧Ｐ３以下になると、空調システムＵの高圧側に残留している冷媒が気体状態であると判断して、低圧管路７の電磁弁２０を開き（９）、空調システムＵの高圧側及び低圧側に残留している気体冷媒を回収する。その後、低圧用圧力センサ１０で検出される圧力ＰＬが回収完了圧Ｐ４以下になると（９）、ほぼ全量の冷媒回収が終了したと判断して、コンプレッサ１２を停止し（１０）、電磁弁１９，２０を閉じる（１１）。   In the process (4), when recovery of the predetermined amount S is not detected, the pressure in the pipe line is monitored by the low pressure sensor 10 (7), and when the detected pressure PL becomes equal to or lower than the predetermined pressure P3, the air conditioning system It is determined that the refrigerant remaining on the high pressure side of U is in a gaseous state, the electromagnetic valve 20 of the low pressure line 7 is opened (9), and the gas refrigerant remaining on the high pressure side and low pressure side of the air conditioning system U Recover. Thereafter, when the pressure PL detected by the low-pressure sensor 10 becomes equal to or lower than the recovery completion pressure P4 (9), it is determined that the recovery of almost the entire amount of refrigerant has been completed, the compressor 12 is stopped (10), and the solenoid valve 19 , 20 are closed (11).

冷媒回収後は、電磁弁２１を開き（１２）、オイルセパレータ９内の分離された冷凍機油を排出パイプ１７を通じて冷凍機油受け１６に排出し、所定時間Ｔ１が経過すると（１３）、電磁弁２１を閉じて（１４）作業終了となる。   After the refrigerant is recovered, the electromagnetic valve 21 is opened (12), and the refrigerating machine oil separated in the oil separator 9 is discharged to the refrigerating machine oil receiver 16 through the discharge pipe 17, and when a predetermined time T1 elapses (13), the electromagnetic valve 21 Is closed (14) to complete the operation.

このように本発明は、オイルセパレータ９の分離性能がコンプレッサ１２の回収能力を下回っているような場合であっても、液化した冷媒がコンプレッサ１２に流入することなく、冷媒回収を行うことができる。なお、実施態様では冷媒回収装置について説明したが、回収した冷媒を空調システムに充填する機能を備えた冷媒回収充填装置にも応用できることは説明するまでもない。   As described above, the present invention can recover the refrigerant without the liquefied refrigerant flowing into the compressor 12 even when the separation performance of the oil separator 9 is lower than the recovery capability of the compressor 12. . In addition, although the refrigerant | coolant collection | recovery apparatus was demonstrated in the embodiment, it cannot be overemphasized that it can apply also to the refrigerant | coolant collection | recovery filling apparatus provided with the function which charges the collect | recovered refrigerant | coolant to an air conditioning system.

１ 装置本体
６ 高圧管路
７ 低圧管路
８ 高圧用圧力センサ
９ オイルセパレータ
１０ 低圧用圧力センサ
１２ コンプレッサ
１４ 冷媒回収タンク
１８ ロードセル（検出手段）
１９ 電磁弁（開閉手段）
２０ 電磁弁
２３ 制御部
Ｕ 車両用空調システム DESCRIPTION OF SYMBOLS 1 Apparatus main body 6 High pressure pipe 7 Low pressure pipe 8 High pressure sensor 9 Oil separator 10 Low pressure sensor 12 Compressor 14 Refrigerant recovery tank 18 Load cell (detection means)
19 Solenoid valve (opening / closing means)
20 Solenoid valve 23 Control unit U Vehicle air conditioning system

Claims (1)

空調システムから冷媒回収タンクに至る回収流路に、該流路を開閉する開閉手段と、流路内の圧力を検出する圧力センサと、回収した冷媒から油分を除去するオイルセパレータと、冷媒を回収するコンプレッサとを配列した冷媒処理装置であって、
前記冷媒回収タンクに冷媒回収量を検出する検出手段を備え、該検出手段で検出される冷媒回収量が所定値に達したら開閉手段を閉じる動作と、前記圧力センサで所定値まで圧力が低下したら開閉手段を開く動作を繰り返し、開閉手段が開いた回収状態で圧力センサが回収目標値に達したらコンプレッサを停止する制御手段を備えたことを特徴とする冷媒処理装置。 Opening and closing means for opening and closing the flow path, a pressure sensor for detecting the pressure in the flow path, an oil separator for removing oil from the recovered refrigerant, and a refrigerant are recovered in a recovery flow path from the air conditioning system to the refrigerant recovery tank A refrigerant processing device in which a compressor is arranged,
The refrigerant recovery tank is provided with detection means for detecting the refrigerant recovery amount, and when the refrigerant recovery amount detected by the detection means reaches a predetermined value, the opening / closing means is closed, and when the pressure is reduced to the predetermined value by the pressure sensor. A refrigerant processing apparatus comprising control means for repeatedly opening the opening / closing means and stopping the compressor when the pressure sensor reaches a recovery target value in a recovery state where the opening / closing means is open.
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