JP5517789B2

JP5517789B2 - Air conditioner

Info

Publication number: JP5517789B2
Application number: JP2010151539A
Authority: JP
Inventors: 哲矢小材; 徳尚西澤
Original assignee: Hitachi Appliances Inc
Current assignee: Hitachi Appliances Inc
Priority date: 2010-07-02
Filing date: 2010-07-02
Publication date: 2014-06-11
Anticipated expiration: 2030-07-02
Also published as: JP2012013339A

Description

本発明は、複数台の室内ユニットを備えた空気調和機の冷媒漏洩遮断機能に関する。 The present invention relates to a refrigerant leakage blocking function of an air conditioner including a plurality of indoor units.

近年、複数台の室内ユニットを接続するマルチ型の空気調和機が主流となり、一つの冷媒システムの構成容量が拡大する傾向にある。この冷媒システムの構成容量および冷媒配管長の拡大に伴い、一つの冷媒システムに保有する全冷媒封入量が非常に大きくなってきている。 In recent years, multi-type air conditioners that connect a plurality of indoor units have become mainstream, and the configuration capacity of one refrigerant system tends to increase. With the expansion of the component capacity and refrigerant pipe length of this refrigerant system, the total amount of refrigerant contained in one refrigerant system has become very large.

その結果、万一、室内ユニット側で冷媒漏洩が発生した場合、冷媒システムが保有する全冷媒が、前記冷媒漏洩した室内ユニットが据付られている一つの部屋に漏洩して充満し、住居者が窒息するなどの危険性がある。 As a result, in the unlikely event that a refrigerant leak occurs on the indoor unit side, all the refrigerant held by the refrigerant system leaks into one room where the refrigerant leaked indoor unit is installed, and the resident There is a risk of suffocation.

この冷媒漏洩に対する危険性を回避するため、安全性と信頼性を損なわず、コストダウン，据付工事性およびサービス性を向上としたマルチ型の空気調和機（マルチエアコン）の冷媒漏洩遮断機能および装置が望まれていた。 Refrigerant leakage shutoff function and device for multi-type air conditioner (multi air conditioner) without costing safety, reliability, cost reduction, installation workability and serviceability to avoid danger to this refrigerant leakage Was desired.

従来の冷媒漏洩を遮断する空調としては、以下の特許文献のものがある。 Conventional air conditioners that block refrigerant leakage include the following patent documents.

特開２０１０−７９９８号公報JP 2010-7998 A 特開２００９−２９９９１０号公報JP 2009-299910 A

特許文献１には、室内制御部が所定のＣＯ₂を検出した場合に、室内電動弁及び室内電磁弁を遮断する技術が記載されている。 Patent Document 1 describes a technique for shutting off an indoor motor-operated valve and an indoor electromagnetic valve when an indoor control unit detects predetermined CO ₂ .

特許文献２には、複数の室内機を備える空気調和機において、冷房運転する室内機と暖房運転する室内機を混在させる場合に使用する冷暖切替ユニットに開閉機構を備え、冷媒漏洩が検知された場合、漏洩検知された室内機の室内膨張弁と開閉機構を閉止する技術が記載されている。 In Patent Document 2, in an air conditioner including a plurality of indoor units, an opening / closing mechanism is provided in a cooling / heating switching unit used when an indoor unit for cooling operation and an indoor unit for heating operation are mixed, and refrigerant leakage is detected. In this case, a technique for closing the indoor expansion valve and the opening / closing mechanism of the indoor unit in which leakage is detected is described.

しかし、上記特許文献のものは、室内膨張弁を有さない室内機（ルームエアコン）を接続する場合には、その室内機で冷媒が漏洩しても冷媒漏洩を遮断することができないという課題がある。 However, the thing of the said patent document WHEREIN: When connecting the indoor unit (room air conditioner) which does not have an indoor expansion valve, even if a refrigerant | coolant leaks with the indoor unit, the subject that refrigerant | coolant leakage cannot be interrupted | blocked is there.

本発明の目的は、新たに冷媒漏洩遮断装置を設けずに冷媒漏洩を遮断することにある。 An object of the present invention is to block refrigerant leakage without newly providing a refrigerant leakage blocking device.

上記目的を達成するために、本発明は、室外ユニットと複数台の室内ユニットとを冷媒配管で接続した空気調和機において、前記室内ユニットと前記室外ユニットとを接続する複数の冷媒配管の一方に設けられた膨張弁と、他方に設けられた電磁弁とを有する外部取付け装置を備え、前記室外ユニットには第１の制御部を備え、前記室内ユニットには第２の制御部と、冷媒漏洩検知器とを備え、前記外部取付け装置には前記第１の制御部，前記第２の制御部，前記冷媒漏洩検知器と信号の送受信を行う第３の制御部を備え、前記第３の制御部は、冷媒漏洩時に前記冷媒漏洩検知器からの情報に基づいて前記膨張弁と前記電磁弁とを閉止することを特徴とする。 In order to achieve the above object, the present invention provides an air conditioner in which an outdoor unit and a plurality of indoor units are connected by a refrigerant pipe, and is connected to one of the plurality of refrigerant pipes connecting the indoor unit and the outdoor unit. An external attachment device having an expansion valve provided and an electromagnetic valve provided on the other, the outdoor unit including a first control unit, the indoor unit including a second control unit, and refrigerant leakage A detector, and the external mounting device includes the first controller, the second controller, and a third controller that transmits and receives signals to and from the refrigerant leakage detector, and the third control The section closes the expansion valve and the electromagnetic valve based on information from the refrigerant leak detector when refrigerant leaks.

また、室外ユニットと複数台の室内ユニットとを冷媒配管で接続した空気調和機において、室内膨張弁を有する前記室内ユニットと、前記室外ユニットとを接続する複数の冷媒配管には電磁弁を有する外部取付け装置を備え、室内膨張弁を有さない前記室内ユニットと、前記室外ユニットとを接続する複数の冷媒配管には膨張弁を有する外部取付け装置を備え、前記室外ユニットには第１の制御部を備え、前記室内ユニットには第２の制御部と、冷媒漏洩検知器とを備え、前記外部取付け装置には前記第１の制御部，前記第２の制御部，前記冷媒漏洩検知器と信号の送受信を行う第３の制御部を備え、前記第３の制御部は、冷媒漏洩時に前記冷媒漏洩検知器からの情報に基づいて前記膨張弁又は前記電磁弁を閉止することを特徴とする。 Further, in an air conditioner in which an outdoor unit and a plurality of indoor units are connected by a refrigerant pipe, an external valve having an electromagnetic valve is provided in the plurality of refrigerant pipes connecting the indoor unit having the indoor expansion valve and the outdoor unit. The plurality of refrigerant pipes that connect the indoor unit that does not have an indoor expansion valve and the outdoor unit are provided with an external mounting device that has an expansion valve, and the outdoor unit includes a first control unit. The indoor unit includes a second control unit and a refrigerant leak detector, and the external attachment device includes the first control unit, the second control unit, the refrigerant leak detector and a signal. The third control unit is configured to close the expansion valve or the electromagnetic valve based on information from the refrigerant leak detector when the refrigerant leaks.

また、圧縮機を有する室外ユニットと複数台の室内ユニットとを、前記圧縮機の吐出側又は吸入側への接続を切替可能な高低圧ガス冷媒配管，前記圧縮機の吸入側に接続される低圧ガス冷媒配管，液側冷媒配管で接続した空気調和機において、前記高低圧ガス冷媒配管，前記低圧ガス冷媒配管，前記液側冷媒配管に膨張弁を有する外部取付け装置を備え、前記室外ユニットには第１の制御部を備え、前記室内ユニットには第２の制御部と、冷媒漏洩検知器とを備え、
前記外部取付け装置には前記第１の制御部，前記第２の制御部，前記冷媒漏洩検知器と信号の送受信を行う第３の制御部を備え、前記第３の制御部は、冷媒漏洩時に前記冷媒漏洩検知器からの情報に基づいて前記膨張弁を閉止することを特徴とする。 The outdoor unit having a compressor and a plurality of indoor units can be connected to a discharge side or a suction side of the compressor, a high / low pressure gas refrigerant pipe that can be switched, and a low pressure connected to the suction side of the compressor In the air conditioner connected by the gas refrigerant pipe and the liquid refrigerant pipe, the high and low pressure gas refrigerant pipe, the low pressure gas refrigerant pipe, and the liquid refrigerant pipe include an external attachment device having an expansion valve, and the outdoor unit includes A first control unit, and the indoor unit includes a second control unit and a refrigerant leak detector,
The external mounting device includes a first control unit, a second control unit, and a third control unit that transmits and receives signals to and from the refrigerant leakage detector, and the third control unit is configured to be used when a refrigerant leaks. The expansion valve is closed based on information from the refrigerant leak detector.

本発明によれば、新たに冷媒漏洩遮断装置を設けずに冷媒漏洩を遮断することができる。 According to the present invention, refrigerant leakage can be blocked without newly providing a refrigerant leakage blocking device.

本発明の実施例１の冷凍サイクル構成図。The refrigeration cycle block diagram of Example 1 of this invention. 本発明の実施例１の制御システム構成図。The control system block diagram of Example 1 of this invention. 本発明の実施例２の冷凍サイクル構成図。The refrigeration cycle block diagram of Example 2 of this invention. 本発明の実施例３の冷凍サイクル構成図。The refrigeration cycle block diagram of Example 3 of this invention.

以下、本発明の実施例を図面を用いて説明する。 Embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明の空気調和機の一実施例として挙げられるマルチ型の空気調和機（マルチエアコン）の冷凍サイクル構成図である。 FIG. 1 is a configuration diagram of a refrigeration cycle of a multi-type air conditioner (multi-air conditioner) that is cited as an embodiment of the air conditioner of the present invention.

マルチ型の空気調和機（マルチエアコン）では、１台の室外ユニットＡと複数台の室内ユニットａ（ａ１，ａ２，・・・ａｎ），室内ユニットｂ（ｂ１，ｂ２，・・・ｂｎ）および各ユニットを接続するガス側冷媒配管Ｅ１，液側冷媒配管Ｅ２で構成されている。ガス側冷媒配管Ｅ１と液側冷媒配管Ｅ２は、ガス側分岐管８および液側分岐管９で分岐接続され、室内ユニットａと室内ユニットｂに分配して冷媒を供給する。室外ユニットＡの室外ガス側阻止弁１にガス側冷媒配管Ｅ１を接続し、室外ユニットＡの室外液側阻止弁２に液側冷媒配管Ｅ２を接続することで、一つの冷凍サイクル系統を構成している。 In the multi-type air conditioner (multi air conditioner), one outdoor unit A and a plurality of indoor units a (a1, a2,... An), indoor units b (b1, b2,... Bn) and It is comprised by the gas side refrigerant | coolant piping E1 and the liquid side refrigerant | coolant piping E2 which connect each unit. The gas side refrigerant pipe E1 and the liquid side refrigerant pipe E2 are branched and connected by the gas side branch pipe 8 and the liquid side branch pipe 9, and are distributed to the indoor unit a and the indoor unit b to supply the refrigerant. By connecting the gas side refrigerant pipe E1 to the outdoor gas side blocking valve 1 of the outdoor unit A and connecting the liquid side refrigerant pipe E2 to the outdoor liquid side blocking valve 2 of the outdoor unit A, one refrigeration cycle system is configured. ing.

室内ユニットａは、機内に減圧装置（膨脹弁）を有する室内ユニット（パッケージエアコン）であり、室内送風機３，室内熱交換器４，室内膨張弁５で構成されている。室内ユニットｂは、機内に減圧装置（膨脹弁）を持たない室内ユニット（ルームエアコン）であり、室内送風機３，室内熱交換器４で構成されている。 The indoor unit a is an indoor unit (package air conditioner) having a decompression device (expansion valve) in the machine, and includes an indoor blower 3, an indoor heat exchanger 4, and an indoor expansion valve 5. The indoor unit b is an indoor unit (room air conditioner) that does not have a decompression device (expansion valve) in the machine, and includes an indoor fan 3 and an indoor heat exchanger 4.

また、室内ユニットａと室内ユニットｂのガス側分岐管８および液側分岐管９と接続されるガス側冷媒配管Ｅ１，液側冷媒配管Ｅ２の途中には、各々に外部取付けの膨張弁６と電磁弁７で構成された外部取付け装置Ｃ（Ｃａ１，Ｃａ２，・・・Ｃａｎ，Ｃｂ１，Ｃｂ２，・・・Ｃｂｎ）が接続される。なお、冷媒漏洩検知器Ｄは室内ユニットａと室内ユニットｂの近傍に取付けされる。 Further, in the middle of the gas-side refrigerant pipe E1 and the liquid-side refrigerant pipe E2 connected to the gas-side branch pipe 8 and the liquid-side branch pipe 9 of the indoor unit a and the indoor unit b, an expansion valve 6 that is externally attached to each of them. An external mounting device C (Ca1, Ca2,..., Can, Cb1, Cb2,... Cbn) constituted by the electromagnetic valve 7 is connected. The refrigerant leakage detector D is attached in the vicinity of the indoor unit a and the indoor unit b.

室外ユニットＡにおいては、圧縮機１０，四方弁１１，室外送風機１２，室外熱交換器１３，室外膨脹弁１４，冷媒タンク１５，アキュームレータ１６で構成されている。矢印は冷媒配管を流れる冷媒の方向を示し、実線矢印が冷房運転で、逆向きの破線矢印が暖房運転を示す。この冷媒の流れ方向は、室外ユニットＡ内の四方弁１１の切り替えにより決められる。 The outdoor unit A includes a compressor 10, a four-way valve 11, an outdoor fan 12, an outdoor heat exchanger 13, an outdoor expansion valve 14, a refrigerant tank 15, and an accumulator 16. The arrow indicates the direction of the refrigerant flowing through the refrigerant pipe, the solid line arrow indicates the cooling operation, and the reverse dashed arrow indicates the heating operation. The flow direction of the refrigerant is determined by switching the four-way valve 11 in the outdoor unit A.

従来では、一つの冷媒システムに保有する全冷媒封入量が規定より大きい場合や、一つの冷媒システムに保有する全冷媒封入量に対し室内ユニットを据付する部屋の内容積が規定より小さい場合には、室内ユニットの機内もしくは室内ユニットの機外（室外ユニットと室内ユニットを接続する冷媒配管の途中）に、冷媒漏洩遮断機能および装置を配置していた。しかしながら、一つの冷媒システムに保有する全冷媒封入量が規定より小さい場合や、一つの冷媒システムに保有する全冷媒封入量に対し室内ユニットを据付する部屋の内容積が規定より大きい場合においては、前記冷媒漏洩遮断機能および装置は不要であった。このため、室内ユニットの機内に冷媒漏洩遮断機能および装置を配置する場合は、室内ユニットの共用化が図れず、室内ユニットのコストアップとなっていた。さらに、室内ユニットの内部スペースに制約があり、冷媒漏洩遮断機能および装置を収納することは困難であった。また、冷媒漏洩遮断機能および装置は、冷媒漏洩に対する危険性を回避するために必要なものであるが、通常の運転時には全く使用されずに、万一の冷媒漏洩時のみで使用されていたため、仮に空気調和機の製品寿命期間まで冷媒漏洩が発生しなかった場合には、前記冷媒漏洩遮断機能および装置は、一度も使用されないままとなっていた。このため、室内ユニットの機外（室外ユニットと室内ユニットを接続する冷媒配管の途中）に冷媒漏洩遮断だけを目的とした機能および装置を有することは、機能と効果，コスト，据付工事性など総合的に考えて望ましくなかった。 Conventionally, when the total amount of refrigerant contained in one refrigerant system is larger than the specified amount, or when the volume of the room where the indoor unit is installed is smaller than the predetermined amount relative to the total amount of refrigerant enclosed in one refrigerant system The refrigerant leakage blocking function and the device are arranged in the indoor unit or outside the indoor unit (in the middle of the refrigerant pipe connecting the outdoor unit and the indoor unit). However, if the total amount of refrigerant enclosed in one refrigerant system is smaller than the specified amount, or if the volume of the room in which the indoor unit is installed is larger than the specified amount relative to the total amount of refrigerant enclosed in one refrigerant system, The refrigerant leakage blocking function and device are unnecessary. For this reason, in the case where the refrigerant leakage blocking function and the device are arranged in the cabin of the indoor unit, the indoor unit cannot be shared and the cost of the indoor unit is increased. Furthermore, the internal space of the indoor unit is limited, and it has been difficult to accommodate the refrigerant leakage blocking function and device. In addition, the refrigerant leakage blocking function and device are necessary to avoid the danger to refrigerant leakage, but were not used at all during normal operation, but were used only in the event of a refrigerant leakage, If the refrigerant leakage did not occur until the product life of the air conditioner, the refrigerant leakage blocking function and device remained unused. For this reason, having a function and device only for blocking refrigerant leakage outside the indoor unit (in the middle of the refrigerant pipe connecting the outdoor unit and the indoor unit) is a comprehensive function, effect, cost, installation workability, etc. Thinking about it was not desirable.

本実施例では、外部取付け装置Ｃの下記の本来機能とは別に、冷媒漏洩遮断機能を付加している。
（１）機内に減圧装置（室内膨脹弁５）を持たない室内ユニットｂ（ルームエアコン）と
機内に減圧装置（室内膨脹弁５）を有する室内ユニットａ（パッケージエアコン）
との混在接続を可能とするための減圧機能および冷媒分岐機能や制御通信機能。
（２）機内に減圧装置（室内膨脹弁５）を有する室内ユニットａ（パッケージエアコン）の冷媒流動音や異音、振動を回避するための代替減圧機能や制御通信機能。 In this embodiment, in addition to the following original function of the external mounting device C, a refrigerant leakage blocking function is added.
(1) Indoor unit b (room air conditioner) that does not have a decompression device (indoor expansion valve 5) in the machine, and indoor unit a (package air conditioner) that has a decompression device (indoor expansion valve 5) in the machine
Decompression function, refrigerant branching function and control communication function to enable mixed connection.
(2) An alternative decompression function and control communication function for avoiding refrigerant flow noise, abnormal noise, and vibration of an indoor unit a (package air conditioner) having a decompression device (indoor expansion valve 5) in the machine.

これにより、室内ユニットの機内もしくは室内ユニットの機外（室外ユニットと室内ユニットを接続する冷媒配管の途中）に、冷媒漏洩遮断機能および装置を配置する必要がなくなる。このため、一つの冷媒システムに保有する全冷媒封入量の規定に対する大小や、全冷媒封入量に対する室内ユニットを据付する部屋の内容積の規定に対する大小によらず、室内ユニットの機内に冷媒漏洩遮断機能および装置を配置する必要がないため、室内ユニットの共用化が図れ、室内ユニットのコストダウンが可能となる。さらに、室内ユニットの内部スペースへ冷媒漏洩遮断機能および装置を収納させるという問題もなくなり、サイズダウンも図れる。また、外部取付け装置Ｃ内に、本来機能とは別の冷媒漏洩遮断機能を付加することにより、通常の運転時および万一の冷媒漏洩時の両者で使用することが可能となる。このため、冷媒漏洩遮断だけを目的とした機能および装置を有する必要がなく、冷媒漏洩に対する安全性と信頼性を損なわずに、コストダウンが可能となる。 Thereby, it is not necessary to arrange the refrigerant leakage blocking function and the device inside the indoor unit or outside the indoor unit (in the middle of the refrigerant pipe connecting the outdoor unit and the indoor unit). Therefore, it is possible to block refrigerant leakage in the indoor unit regardless of the size of the total amount of refrigerant contained in one refrigerant system and the size of the indoor volume of the room where the indoor unit is installed. Since it is not necessary to arrange functions and devices, the indoor unit can be shared, and the cost of the indoor unit can be reduced. Further, the problem of storing the refrigerant leakage blocking function and the device in the internal space of the indoor unit is eliminated, and the size can be reduced. Further, by adding a refrigerant leakage blocking function different from the original function in the external mounting device C, it is possible to use it during both normal operation and emergency refrigerant leakage. For this reason, it is not necessary to have the function and apparatus only for the refrigerant | coolant leakage interruption | blocking, and cost reduction is attained without impairing the safety | security and reliability with respect to a refrigerant | coolant leakage.

さらに、従来では冷媒漏洩が発生した場合は、全ての空気調和機の運転を停止しなければならず、かつ、冷媒漏洩した箇所を容易に特定するのができないことから、サービス性が悪く、冷媒漏洩の修理、空気調和機の復旧に非常に時間を要していた。 Furthermore, conventionally, when refrigerant leakage occurs, the operation of all the air conditioners must be stopped, and the location where the refrigerant has leaked cannot be easily identified. It took a very long time to repair the leak and restore the air conditioner.

本実施例によると、外部取付け装置Ｃから室外ユニットＡと室内ユニットａと室内ユニットｂおよび上位の集中管理制御機器２０やリモコン１７に対して、冷媒漏洩の情報を指令することで、冷媒漏洩した当該室内機ユニットを容易に特定することができ、サービス性の向上することが可能となる。さらに当該室内機ユニットのみ運転を停止させ、他室内ユニットの運転を継続可能とさせることで、冷媒漏洩の早期修理、空気調和機の早期復旧が可能となる。 According to the present embodiment, the refrigerant leaked by instructing the refrigerant leakage information from the external mounting device C to the outdoor unit A, the indoor unit a, the indoor unit b, and the upper centralized control device 20 and the remote controller 17. The indoor unit can be easily identified, and serviceability can be improved. Further, by stopping the operation of only the indoor unit and allowing the operation of the other indoor units to be continued, early repair of refrigerant leakage and early recovery of the air conditioner are possible.

ここで、具体例として、仮に室内ユニットａ１にて冷媒漏洩が発生した場合、冷媒漏洩検知器Ｄで検知した冷媒漏洩の情報が、外部取付け装置Ｃａ１の制御部２５へ制御通信線２２によって伝送される。その冷媒漏洩の情報により、外部取付け装置Ｃａ１内の膨脹弁６と電磁弁７を全閉とさせることで、冷凍サイクル系統を完全に切り離し、室内ユニットａ１からの冷媒漏洩を遮断する。 Here, as a specific example, if a refrigerant leak occurs in the indoor unit a1, information on the refrigerant leak detected by the refrigerant leak detector D is transmitted to the control unit 25 of the external mounting device Ca1 via the control communication line 22. The Based on the information on the refrigerant leakage, the expansion valve 6 and the electromagnetic valve 7 in the external attachment device Ca1 are fully closed, thereby completely disconnecting the refrigeration cycle system and blocking the refrigerant leakage from the indoor unit a1.

また、冷媒漏洩遮断と共に、外部取付け装置Ｃａ１から室外ユニットＡと室内ユニットａ（ａ１，ａ２，・・・ａｎ）と室内ユニットｂ（ｂ１，ｂ２，・・・ｂｎ）および上位の集中管理制御機器２０やリモコン１７に対して、冷媒漏洩の情報を指令することで、室外ユニットＡや上位の集中管理制御機器２０やリモコン１７に「室内ユニットａ１：冷媒漏洩」という警告を表示する。 Further, together with the refrigerant leakage shut-off, the external unit A1, the outdoor unit A, the indoor units a (a1, a2,... An), the indoor units b (b1, b2,. By instructing the refrigerant leakage information to the remote control unit 20 and the remote controller 17, a warning “indoor unit a1: refrigerant leakage” is displayed on the outdoor unit A, the host central control device 20 and the remote control unit 17.

さらに、冷媒漏洩した当該室内ユニットａ１のみ運転を停止し、室内ユニットａ１の電源および制御通信をシャットダウンさせることで、室内ユニットａ１を制御システム系統から完全に切り離すことができる。これにより、室内ユニットａ１以外の全室内ユニットの運転を継続することができる。 Furthermore, the indoor unit a1 can be completely disconnected from the control system system by stopping the operation of only the indoor unit a1 leaking the refrigerant and shutting down the power supply and control communication of the indoor unit a1. Thereby, the operation of all indoor units other than the indoor unit a1 can be continued.

図２は、本発明の空気調和機の一実施例として挙げられるマルチ型の空気調和機（マルチエアコン）の制御システム構成図である。 FIG. 2 is a configuration diagram of a control system of a multi-type air conditioner (multi-air conditioner) that is cited as an embodiment of the air conditioner of the present invention.

１７は室内ユニットａと室内ユニットｂに制御指令（運転／停止，運転モード，温度，風量／風向などの設定）を与えるリモコン、１８はリモコン線である。２０はマルチ型の空気調和機全体の動作を制御する上位の集中管理制御機器であり、２３は室外ユニットＡの第１の制御部、２４は室内ユニットａと室内ユニットｂの第２の制御部、２５は外部取付け装置Ｃの第３の制御部である。 Reference numeral 17 denotes a remote controller that gives control commands (settings such as operation / stop, operation mode, temperature, air volume / air direction) to the indoor unit a and the indoor unit b, and 18 denotes a remote control line. 20 is a high-order centralized control device that controls the operation of the entire multi-type air conditioner, 23 is a first control unit of the outdoor unit A, and 24 is a second control unit of the indoor unit a and the indoor unit b. , 25 is a third control unit of the external mounting device C.

１９は第１の制御部２３と第２の制御部２４と第３の制御部２５を接続する伝送線、２１は上位の集中管理制御機器２０と前記制御部２３を接続する集中管理制御伝送線、２２は冷媒漏洩検知器Ｄと前記制御部２５を接続する制御通信線であり、全てを接続することで、一つの制御システムを構成している。 Reference numeral 19 denotes a transmission line connecting the first control unit 23, the second control unit 24, and the third control unit 25. Reference numeral 21 denotes a centralized management control transmission line connecting the host centralized control device 20 and the control unit 23. , 22 is a control communication line that connects the refrigerant leakage detector D and the control unit 25, and constitutes one control system by connecting all of them.

これにより室外ユニットＡ，室内ユニットａ，室内ユニットｂ，外部取付け装置Ｃ，上位の集中管理制御機器２０，リモコン１７は、お互いに情報を交換し、予め記憶された制御プログラムに基づいて制御されることになる。 As a result, the outdoor unit A, the indoor unit a, the indoor unit b, the external mounting device C, the host central control device 20 and the remote controller 17 exchange information with each other and are controlled based on a pre-stored control program. It will be.

なお、本実施例は冷媒漏洩検知器Ｄの検知手段や方法について言及していないが、冷媒ガス濃度検知またはサイクル温度や圧力変動検知など、如何なる検知手段や方法を問わず対応できる。要は冷媒漏洩検知器Ｄで検知した冷媒漏洩の情報を、外部取付け装置Ｃの制御部２５へ制御通信線２２によって伝送できれば良い。 Although this embodiment does not mention the detection means and method of the refrigerant leak detector D, it can be applied regardless of any detection means or method such as refrigerant gas concentration detection or cycle temperature or pressure fluctuation detection. In short, it is only necessary that the refrigerant leakage information detected by the refrigerant leakage detector D can be transmitted to the control unit 25 of the external mounting device C through the control communication line 22.

図３は、本発明の空気調和機の一実施例として挙げられるマルチ型の空気調和機（マルチエアコン）の冷凍サイクル構成図である。 FIG. 3 is a configuration diagram of a refrigeration cycle of a multi-type air conditioner (multi-air conditioner) cited as an embodiment of the air conditioner of the present invention.

実施例１では外部取付け装置Ｃ（Ｃａ１，Ｃａ２，・・・Ｃａｎ，Ｃｂ１，Ｃｂ２，・・・Ｃｂｎ）は個々の筐体で構成されているが、図３の実施例２のように一つの筐体内で構成されていても良い。過去の例では、一つの筐体内で膨張弁６を複数台有した外部取付け装置が存在するが、７の電磁弁を持たないため、冷媒漏洩遮断することができなかった。しかし、これに７の電磁弁を追加するのみで、冷媒漏洩遮断の機能を有することが可能であり、コストを抑えることができる。なお、各々の配管に電磁弁７を個々に有しているが、これを一つに纏めれば、更なるコストダウンを図ることができる。 In the first embodiment, the external mounting device C (Ca1, Ca2,..., Can, Cb1, Cb2,... Cbn) is composed of individual casings, but as in the second embodiment of FIG. You may be comprised in the housing | casing. In the past example, there is an external mounting device having a plurality of expansion valves 6 in one housing, but since there is no 7 electromagnetic valve, the refrigerant leakage cannot be blocked. However, only by adding 7 solenoid valves to this, it is possible to have a function of blocking the refrigerant leakage, and the cost can be reduced. In addition, although each solenoid valve 7 is individually provided in each piping, if this is put together, the further cost reduction can be aimed at.

図４は、本発明の空気調和機の一実施例として挙げられるマルチ型の空気調和機（マルチエアコン）の冷凍サイクル構成図である。 FIG. 4 is a configuration diagram of a refrigeration cycle of a multi-type air conditioner (multi-air conditioner) cited as an embodiment of the air conditioner of the present invention.

本実施例では、室内ユニットに冷房運転と暖房運転とを混在させることができる熱回収型の室外ユニットと複数台の室内ユニットに外部取付け装置とガス側冷媒配管Ｅ１を２本備える（高低圧が切り替わるガス配管と低圧ガス配管）。例えば、室内ユニットａ１を冷房、室内ユニットｂ１を暖房とする場合、外部取付け装置内の膨張弁６ａ，６ｃを開、６ｂを閉とし、外部取付け装置内の膨張弁６ｅ，６ｆを開、６ｄを閉とする。 In this embodiment, the heat recovery type outdoor unit that can mix the cooling operation and the heating operation in the indoor unit and the plurality of indoor units are provided with two external attachment devices and two gas side refrigerant pipes E1 (high and low pressure are Switching gas piping and low-pressure gas piping). For example, when the indoor unit a1 is cooled and the indoor unit b1 is heated, the expansion valves 6a and 6c in the external mounting device are opened, 6b is closed, the expansion valves 6e and 6f in the external mounting device are opened, and 6d is opened. Closed.

このマルチ型の空気調和機（マルチエアコン）においても、外部取付け装置の本来機能（室内ユニットの冷房と暖房の負荷状態に応じ、高圧ガスと低圧ガスを切り替えするための冷凍サイクル回路切替機能や制御通信機能）に、本来機能とは別の冷媒漏洩遮断機能を付加することで、上記と同じ効果が得られる。 Even in this multi-type air conditioner (multi-air conditioner), the original function of the external attachment device (refrigeration cycle circuit switching function and control for switching between high-pressure gas and low-pressure gas according to the cooling state and heating load state of the indoor unit) The same effect as described above can be obtained by adding a refrigerant leakage blocking function different from the original function to the communication function.

１室外ガス側阻止弁
２室外液側阻止弁
３室内送風機
４室内熱交換器
５室内膨張弁
６外部取付け装置内の膨張弁（膨張弁）
７外部取付け装置内の電磁弁（電磁弁）
８ガス側分岐管
９液側分岐管
１０圧縮機
１１四方弁
１２室外送風機
１３室外熱交換器
１４室外膨張弁
１５冷媒タンク
１６アキュームレータ
１７リモコン
１８リモコン線
１９室外ユニット〜外部取付け装置〜室内ユニットの伝送線
２０集中管理制御機器
２１集中管理制御機器の伝送線
２２冷媒漏洩検知器〜外部取付け装置の制御通信線
２３室外ユニットの制御部（第１の制御部）
２４室内ユニットの制御部（第２の制御部）
２５外部取付け装置の制御部（第３の制御部）
Ａ室外ユニット
ａ１，ａ２，・・・ａｎ機内に減圧装置を有する室内ユニット（パッケージエアコン）
ｂ１，ｂ２，・・・ｂｎ機内に減圧装置を有しない室内ユニット（ルームエアコン）
Ｃａ１，Ｃａ２，・・・Ｃａｎ，Ｃｂ１，Ｃｂ２，・・・Ｃｂｎ外部取付け装置
Ｄ冷媒漏洩検知器
Ｅ１ガス側冷媒配管（冷媒配管，高低圧ガス冷媒配管，低圧ガス冷媒配管）
Ｅ２液側冷媒配管（冷媒配管） DESCRIPTION OF SYMBOLS 1 Outdoor gas side blocking valve 2 Outdoor liquid side blocking valve 3 Indoor blower 4 Indoor heat exchanger 5 Indoor expansion valve 6 Expansion valve (expansion valve) in external mounting device
7 Solenoid valve in external mounting device (solenoid valve)
8 Gas side branch pipe 9 Liquid side branch pipe 10 Compressor 11 Four-way valve 12 Outdoor blower 13 Outdoor heat exchanger 14 Outdoor expansion valve 15 Refrigerant tank 16 Accumulator 17 Remote control 18 Remote control line 19 Outdoor unit to external mounting device to indoor unit transmission Line 20 Centralized management control device 21 Transmission line 22 of centralized management control device Control communication line 23 of refrigerant leak detector to external mounting device Control unit (first control unit) of outdoor unit
24 Control unit of indoor unit (second control unit)
25 Control unit of external mounting device (third control unit)
A Outdoor unit a1, a2, ... an Indoor unit (package air conditioner) having a decompression device in the machine
b1, b2, ... bn Indoor units (room air conditioners) that do not have a decompressor in the machine
Ca1, Ca2, ... Can, Cb1, Cb2, ... Cbn External mounting device D Refrigerant leak detector E1 Gas side refrigerant pipe (refrigerant pipe, high-low pressure gas refrigerant pipe, low-pressure gas refrigerant pipe)
E2 Liquid side refrigerant piping (refrigerant piping)

Claims

In an air conditioner in which an outdoor unit and a plurality of indoor units are connected by a refrigerant pipe,
Among the indoor units, comprising an external attachment device attached to the outside with respect to the indoor unit having an indoor expansion valve,
The outdoor unit includes a first control unit,
The indoor unit includes a second control unit and a refrigerant leak detector,
The external mounting device includes an expansion valve provided on one of a plurality of refrigerant pipes connecting the indoor unit and the outdoor unit, and an electromagnetic valve provided on the other, and the first control unit, A second control unit, and a third control unit that transmits and receives signals to and from the refrigerant leak detector,
The third control unit, instead of the indoor expansion valve, decompresses the refrigerant in the one refrigerant pipe by the expansion valve, while the expansion valve is based on information from the refrigerant leakage detector when the refrigerant leaks And the electromagnetic valve are closed.

3. The third control unit according to claim 1, wherein the third control unit provided in the external mounting device that closes the expansion valve and the electromagnetic valve leaks refrigerant to the first control unit and the second control unit. The air conditioner is characterized by stopping the operation of the indoor unit receiving the information on the refrigerant leakage and receiving the information on the leakage of the refrigerant, and continuing the operation of the other indoor units.

In an air conditioner in which an outdoor unit and a plurality of indoor units are connected by a refrigerant pipe,
The plurality of indoor units includes the indoor unit having an indoor expansion valve, and the indoor unit having no indoor expansion valve,
An external attachment device attached externally to the indoor unit that does not have an indoor expansion valve;
The outdoor unit includes a first control unit,
The indoor unit includes a second control unit and a refrigerant leak detector,
The external attachment device includes an expansion valve provided on one of a plurality of refrigerant pipes connecting the indoor unit and the outdoor unit not having an indoor expansion valve, and an electromagnetic valve provided on the other. A first control unit; a second control unit; a third control unit that performs transmission and reception of signals with the refrigerant leak detector;
The third control unit depressurizes the refrigerant in the one refrigerant pipe by the expansion valve, and closes the expansion valve or the electromagnetic valve based on information from the refrigerant leakage detector when refrigerant leaks. Air conditioner characterized by.

In Claim 3, The said 3rd control part provided in the said external attachment apparatus which closed the said expansion valve or the said electromagnetic valve is a refrigerant | coolant leak with respect to the said 1st control part and the said 2nd control part. The air conditioner characterized in that the operation of the indoor unit that has transmitted the information and has received the information on the refrigerant leakage is stopped, and the operation of the other indoor units is continued.

High-low pressure gas refrigerant pipe capable of switching connection between an outdoor unit having a compressor and a plurality of indoor units to the discharge side or suction side of the compressor, and low-pressure gas refrigerant connected to the suction side of the compressor In air conditioners connected by piping and liquid side refrigerant piping,
An external attachment device attached externally to each of the plurality of indoor units ;
The outdoor unit includes a first control unit,
The indoor unit includes a second control unit and a refrigerant leak detector,
In the external mounting device , an expansion valve is attached to the high-low pressure gas refrigerant pipe, the low-pressure gas refrigerant pipe, and the liquid-side refrigerant pipe, and the first control unit, the second control unit, and the refrigerant leak detector And a third control unit for transmitting and receiving signals,
When the plurality of indoor units perform both a cooling operation and a heating operation, the third control unit of the external mounting device attached to the indoor unit performing the cooling operation is attached to the high-low pressure gas refrigerant pipe. And controlling the expansion valve attached to the low-pressure gas refrigerant pipe and the liquid refrigerant pipe to be opened, and the third of the external attachment device attached to the indoor unit that performs heating operation. The control unit controls to close the expansion valve attached to the low-pressure gas refrigerant pipe and open the expansion valve attached to the high-low pressure gas refrigerant pipe and the liquid-side refrigerant pipe. All the said expansion valves are closed based on the information from a detector, The air conditioner characterized by the above-mentioned.

In Claim 5, The said 3rd control part provided in the said external attachment apparatus which closed the said expansion valve transmits the information of refrigerant | coolant leakage with respect to a said 1st control part and a said 2nd control part. The air conditioner is characterized in that the operation of the indoor unit that has received the refrigerant leakage information is stopped, and the operation of the other indoor units is continued.