JPH11118266A - Refrigerant circuit - Google Patents

Refrigerant circuit

Info

Publication number
JPH11118266A
JPH11118266A JP28840397A JP28840397A JPH11118266A JP H11118266 A JPH11118266 A JP H11118266A JP 28840397 A JP28840397 A JP 28840397A JP 28840397 A JP28840397 A JP 28840397A JP H11118266 A JPH11118266 A JP H11118266A
Authority
JP
Japan
Prior art keywords
heat exchanger
expansion valve
supercooling
compressor
receiver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP28840397A
Other languages
Japanese (ja)
Other versions
JP4035871B2 (en
Inventor
Takeo Ueno
武夫 植野
Masaki Yamamoto
政樹 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Priority to JP28840397A priority Critical patent/JP4035871B2/en
Publication of JPH11118266A publication Critical patent/JPH11118266A/en
Application granted granted Critical
Publication of JP4035871B2 publication Critical patent/JP4035871B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/0272—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using bridge circuits of one-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/23—Separators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2509—Economiser valves

Landscapes

  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant circuit that can prevent liquid from being sealed and returned and can improve reliability. SOLUTION: A refrigerant circuit introduces a liquid refrigerant sealed on the downstream side of a main expansion valve 10 on shipment by a capillary 20 for connecting the upper part 8A of a receiver 8 to the downstream side of the main inflation valve 10, and prevents the refrigerant from being sealed. Also, a supercooling circuit 30 branches from the downstream side of the main expansion valve 10, thus introducing a gaseous refrigerant expanded by the main expansion valve to the supercooling circuit 30 and preventing a liquid from being transiently returned to a compressor 5 from the supercooling circuit 30 on activation and stop where the supercooling cannot be performed easily. Furthermore, a gas refrigerant is supplied to an intake side 5A of the compressor 5 from the upper part 8A of the receiver via a connection capillary 20 and the supercooling circuit 30, thus preventing the gas shortage of the compressor 5.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】この発明は、冷媒回路に関す
る。[0001] The present invention relates to a refrigerant circuit.

【０００２】[0002]

【従来の技術】従来、冷媒回路としては、図４に示すも
のがある。この冷媒回路は、室内熱交換器１０１，閉鎖
弁１０６，圧縮機１０２，室外熱交換器１０３，レシー
バ１０４，主膨張弁１０５，閉鎖弁１０７が順に接続さ
れた主回路を備えている。また、この冷媒回路は、レシ
ーバ１０４と主膨張弁１０５との間を流れる冷媒を過冷
却する過冷却熱交換器１０８を備えた過冷却回路１１０
を有している。この過冷却回路１１０は、主膨張弁１０
５の上流から分岐して、過冷却膨張弁１１２，過冷却熱
交換器１０８を経由して圧縮機１０２の吸入側に接続さ
れている。2. Description of the Related Art FIG. 4 shows a conventional refrigerant circuit. The refrigerant circuit includes a main circuit in which an indoor heat exchanger 101, a closing valve 106, a compressor 102, an outdoor heat exchanger 103, a receiver 104, a main expansion valve 105, and a closing valve 107 are sequentially connected. Further, the refrigerant circuit includes a subcooling circuit 110 including a subcooling heat exchanger 108 for supercooling the refrigerant flowing between the receiver 104 and the main expansion valve 105.
have. This subcooling circuit 110 is provided with the main expansion valve 10.
5 and is connected to the suction side of the compressor 102 via a subcooling expansion valve 112 and a subcooling heat exchanger 108.

【０００３】この冷媒回路は、レシーバ１０４から室内
熱交換器１０１に向かう冷媒を、上記過冷却熱交換器１
０８で過冷却することによって、冷房能力の向上を図っ
ている。[0003] The refrigerant circuit transfers the refrigerant flowing from the receiver 104 to the indoor heat exchanger 101 through the subcooling heat exchanger 1.
08, the cooling capacity is improved.

【０００４】[0004]

【発明が解決しようとする課題】ところで、一般に、こ
のような冷媒回路を備えた冷凍機あるいは空気調和機
は、出荷時には、閉鎖弁１０６，１０７が閉鎖されてい
て、主膨張弁１０５も閉まっている。このため、出荷か
ら据付けて運転するまでの期間に、閉鎖弁１０７と主膨
張弁１０５との間の冷媒配管において冷媒が液封状態に
なり、異常な圧力上昇を招く恐れがあるという問題があ
る。Generally, in a refrigerator or an air conditioner provided with such a refrigerant circuit, when shipped, the closing valves 106 and 107 are closed and the main expansion valve 105 is also closed. I have. For this reason, during the period from shipping to installation and operation, there is a problem that the refrigerant is in a liquid-sealed state in the refrigerant pipe between the closing valve 107 and the main expansion valve 105, which may cause an abnormal increase in pressure. .

【０００５】また、上記冷媒回路では、起動時に、レシ
ーバ１０４から過冷却回路１１０を経由して圧縮機１０
２に液冷媒が導入される液バック現象で圧縮機１０２を
傷める恐れがある。[0005] In the above-described refrigerant circuit, at the time of start-up, the compressor 104 is supplied from the receiver 104 via the subcooling circuit 110.
There is a possibility that the compressor 102 may be damaged due to the liquid back phenomenon in which the liquid refrigerant is introduced into the compressor 102.

【０００６】そこで、この発明の目的は、液封や液バッ
クを防止でき、信頼性の向上を図れる冷媒回路を提供す
ることにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a refrigerant circuit which can prevent liquid sealing and liquid back and improve reliability.

【０００７】[0007]

【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明の冷媒回路は、室内熱交換器，圧縮
機，室外熱交換器，レシーバ，主膨張弁を接続する冷媒
回路であって、上記レシーバの上部と上記主膨張弁の下
流側とを連結するキャピラリを備えたことを特徴として
いる。According to a first aspect of the present invention, there is provided a refrigerant circuit for connecting an indoor heat exchanger, a compressor, an outdoor heat exchanger, a receiver, and a main expansion valve. And a capillary that connects an upper part of the receiver and a downstream side of the main expansion valve.

【０００８】この請求項１の冷媒回路では、上記キャピ
ラリがレシーバの上部と主膨張弁の下流側とを連絡する
から、出荷時等において主膨張弁の下流側回路に封じら
れた液冷媒を上記キャピラリから上記レシーバの上部の
気相空間に導入することができる。したがって、主膨張
弁の下流で液封が発生することを防いで、信頼性を向上
できる。In the refrigerant circuit of the first aspect, the capillary communicates the upper portion of the receiver with the downstream side of the main expansion valve. It can be introduced from the capillary into the vapor space above the receiver. Therefore, it is possible to prevent the occurrence of liquid seal downstream of the main expansion valve, and to improve reliability.

【０００９】また、請求項２の冷媒回路は、室内熱交換
器，圧縮機，室外熱交換器，レシーバ，主膨張弁を接続
する冷媒回路であって、上記レシーバから上記主膨張弁
に流れる冷媒を冷やす過冷却熱交換器とこの過冷却熱交
換器の上流側に接続された過冷却膨張弁とを有した過冷
却回路が、上記主膨張弁の下流側から分岐して上記圧縮
機の吸入側に接続されていることを特徴としている。The refrigerant circuit of the present invention is a refrigerant circuit for connecting an indoor heat exchanger, a compressor, an outdoor heat exchanger, a receiver, and a main expansion valve, wherein the refrigerant flows from the receiver to the main expansion valve. A supercooling circuit having a supercooling heat exchanger for cooling the compressor and a supercooling expansion valve connected to the upstream side of the supercooling heat exchanger branches from the downstream side of the main expansion valve and suctions the compressor. Side.

【００１０】この請求項２の発明では、上記過冷却回路
が主膨張弁の下流から分岐しているから、気相冷媒を過
冷却回路に導入できる。したがって、過冷却し難い起動
時や停止時に上記過冷却回路から圧縮機への過渡的な液
バックを防止でき、圧縮機の信頼性を向上できる。According to the second aspect of the present invention, since the subcooling circuit branches off from the downstream side of the main expansion valve, the gaseous refrigerant can be introduced into the subcooling circuit. Therefore, at the time of starting or stopping when it is difficult to supercool, a transient liquid back from the supercooling circuit to the compressor can be prevented, and the reliability of the compressor can be improved.

【００１１】また、請求項３の冷媒回路は、室内熱交換
器，圧縮機，室外熱交換器，レシーバ，主膨張弁を接続
する冷媒回路であって、上記レシーバの上部と上記主膨
張弁の下流側とを連結するキャピラリを備え、上記レシ
ーバから上記主膨張弁に流れる冷媒を冷やす過冷却熱交
換器とこの過冷却熱交換器の上流側に接続された過冷却
膨張弁とを有した過冷却回路が、上記主膨張弁の下流側
から分岐して上記圧縮機の吸入側に接続されていること
を特徴としている。The refrigerant circuit of claim 3 is a refrigerant circuit for connecting an indoor heat exchanger, a compressor, an outdoor heat exchanger, a receiver, and a main expansion valve, wherein the upper part of the receiver and the main expansion valve are connected. A supercooling heat exchanger for cooling the refrigerant flowing from the receiver to the main expansion valve, and a supercooling expansion valve connected to the upstream side of the supercooling heat exchanger. A cooling circuit is branched from a downstream side of the main expansion valve and connected to a suction side of the compressor.

【００１２】この請求項３の発明では、上記キャピラリ
がレシーバの上部と主膨張弁の下流側とを連絡するか
ら、出荷時等において主膨張弁の下流側回路に封じられ
た液冷媒を上記キャピラリから上記レシーバの上部の気
相空間に導入することができる。したがって、主膨張弁
の下流で液封が発生することを防いで、信頼性を向上で
きる。According to the third aspect of the present invention, since the capillary communicates the upper portion of the receiver with the downstream side of the main expansion valve, the liquid refrigerant sealed in the downstream circuit of the main expansion valve at the time of shipping or the like is supplied to the capillary. Can be introduced into the gas phase space above the receiver. Therefore, it is possible to prevent the occurrence of liquid seal downstream of the main expansion valve, and to improve reliability.

【００１３】また、上記過冷却回路が主膨張弁の下流か
ら分岐しているから、気相冷媒を過冷却回路に導入し
て、過冷却し難い起動時や停止時に過冷却回路から圧縮
機への過渡的な液バックを防止でき、圧縮機の信頼性を
向上できる。Further, since the subcooling circuit branches off from the downstream of the main expansion valve, the gaseous refrigerant is introduced into the subcooling circuit, and when starting or stopping when it is difficult to perform subcooling, the subcooling circuit sends the refrigerant to the compressor. Transient liquid back can be prevented, and the reliability of the compressor can be improved.

【００１４】さらには、上記キャピラリと上記過冷却回
路を経由して、上記レシーバ上部から上記圧縮機の吸入
側にガス冷媒を供給できるから、圧縮機のガス欠を防止
でき、信頼性を向上できる。Further, gas refrigerant can be supplied from the upper portion of the receiver to the suction side of the compressor via the capillary and the supercooling circuit, so that the compressor can be prevented from running out of gas and reliability can be improved. .

【００１５】また、請求項４の発明は、請求項１乃至３
のいずれか１つに記載の冷媒回路において、上記圧縮機
の吐出側を室外熱交換器に接続し、上記圧縮機の吸入側
を室内熱交換器に接続する冷房位置と、上記圧縮機の吐
出側を室内熱交換器に接続し、上記圧縮機の吸入側を室
外熱交換器に接続する暖房位置とに切り替えられる四路
切換弁と、上記室内熱交換器からの冷媒を上記レシーバ
に導き、上記レシーバ，主膨張弁を経由した冷媒を上記
室外熱交換器に導く一方、上記室外熱交換器からの冷媒
を上記レシーバに導き、上記レシーバ，主膨張弁を経由
した冷媒を上記室内熱交換器に導く整流回路とを備えた
ことを特徴としている。[0015] The invention of claim 4 is the invention of claims 1 to 3
In the refrigerant circuit according to any one of the above, a discharge position of the compressor is connected to an outdoor heat exchanger, and a suction position of the compressor is connected to an indoor heat exchanger. Side to the indoor heat exchanger, a four-way switching valve that can be switched to a heating position to connect the suction side of the compressor to the outdoor heat exchanger, and the refrigerant from the indoor heat exchanger to the receiver, The refrigerant that has passed through the receiver and the main expansion valve is guided to the outdoor heat exchanger, while the refrigerant from the outdoor heat exchanger is guided to the receiver, and the refrigerant that has passed through the receiver and the main expansion valve is transmitted to the indoor heat exchanger. And a rectifier circuit that leads to

【００１６】この請求項４の発明では、上記四路切換弁
を冷房位置にすれば、冷媒を圧縮機から室外熱交換器，
整流回路，レシーバ，主膨張弁，室内熱交換器の順に流
して、冷房を行える一方、上記四路切換弁を暖房位置に
すれば、冷媒を圧縮機から室内熱交換器，整流回路，レ
シーバ，主膨張弁，室外熱交換器の順に流して、暖房を
行える。また、上記冷房時，暖房時の両方において、上
記過冷却回路を働かせて、過冷却による能力向上を図れ
る。According to the fourth aspect of the present invention, when the four-way switching valve is set to the cooling position, the refrigerant flows from the compressor to the outdoor heat exchanger,
Cooling can be performed by flowing the rectifier circuit, the receiver, the main expansion valve, and the indoor heat exchanger in this order. On the other hand, if the four-way switching valve is set to the heating position, the refrigerant flows from the compressor to the indoor heat exchanger, the rectifier circuit, the receiver, Heating can be performed by flowing in the order of the main expansion valve and the outdoor heat exchanger. In addition, in both the cooling and the heating, the subcooling circuit is operated to improve the performance by the supercooling.

【００１７】また、請求項５の発明は、請求項１乃至４
のいずれか１つに記載の冷媒回路において、上記過冷却
膨張弁は、上記過冷却熱交換器の出口での過冷却回路の
温度に応じて開度が変化する感温筒式膨張弁であること
を特徴としている。Further, the invention of claim 5 provides the invention according to claims 1 to 4
In the refrigerant circuit according to any one of the above, the supercooling expansion valve is a temperature-sensitive cylinder type expansion valve whose opening degree changes according to the temperature of the supercooling circuit at the outlet of the supercooling heat exchanger. It is characterized by:

【００１８】この請求項５の発明では、上記感温筒式膨
張弁でもって、過冷却熱交換器の出口での冷媒温度の高
低に応じて、過冷却膨張弁の開度を大小に調節して、過
冷却度を所定の値に維持できる。According to the fifth aspect of the present invention, the degree of opening of the subcooling expansion valve is adjusted by the temperature-sensitive cylinder type expansion valve according to the refrigerant temperature at the outlet of the subcooling heat exchanger. Thus, the degree of supercooling can be maintained at a predetermined value.

【００１９】また、請求項６の発明は、室内熱交換器，
圧縮機，室外熱交換器，レシーバ，主膨張弁を接続する
冷媒回路であって、上記圧縮機の吐出側を室外熱交換器
に接続し、上記圧縮機の吸入側を室内熱交換器に接続す
る冷房位置と、上記圧縮機の吐出側を室内熱交換器に接
続し、上記圧縮機の吸入側を室外熱交換器に接続する暖
房位置とに切り替えられる四路切換弁と、上記室内熱交
換器に第２端が接続され、上記レシーバ上部の所定箇所
に第３端が接続され、上記レシーバ上部の別の箇所に第
４端が接続され、上記室外熱交換器に第５端が接続さ
れ、上記主膨張弁に第１端が接続されており、上記第２
端と第３端との間に接続されたキャピラリと、上記第４
端と第５端との間に接続されたキャピラリと、上記第５
端と第１端との間に上記第１端から上記第５端に向かっ
て順方向に接続された逆止弁と、上記第１端と上記第２
端との間に上記第１端から第２端に向かって順方向に接
続された逆止弁とを有する整流回路と、上記主膨張弁の
下流側から分岐して上記圧縮機の吸入側に接続されてい
て、上記レシーバから上記主膨張弁に流れる冷媒を冷や
す過冷却熱交換器とこの過冷却熱交換器の下流側に接続
された過冷却膨張弁とを有した過冷却回路とを備えたこ
とを特徴としている。The invention according to claim 6 is an indoor heat exchanger,
A refrigerant circuit for connecting a compressor, an outdoor heat exchanger, a receiver, and a main expansion valve, wherein a discharge side of the compressor is connected to an outdoor heat exchanger, and a suction side of the compressor is connected to an indoor heat exchanger. A four-way switching valve that is switched to a cooling position, a heating position where the discharge side of the compressor is connected to an indoor heat exchanger, and a suction side of the compressor is connected to an outdoor heat exchanger, and the indoor heat exchange. A second end is connected to the receiver, a third end is connected to a predetermined portion of the upper portion of the receiver, a fourth end is connected to another portion of the upper portion of the receiver, and a fifth end is connected to the outdoor heat exchanger. A first end connected to the main expansion valve, and a second end connected to the second expansion valve;
A capillary connected between the end and the third end;
A capillary connected between the end and the fifth end;
A check valve connected between the first end and the first end in a forward direction from the first end to the fifth end; and a check valve connected to the first end and the second end.
A rectifier circuit having a check valve connected in a forward direction from the first end to the second end between the first and second ends; and a rectifying circuit branched from a downstream side of the main expansion valve to a suction side of the compressor. A supercooling circuit that is connected and has a supercooling heat exchanger that cools the refrigerant flowing from the receiver to the main expansion valve and a supercooling expansion valve connected downstream of the supercooling heat exchanger. It is characterized by that.

【００２０】この請求項６の発明では、上記四路切換弁
を冷房位置にすれば、順に、圧縮機，室外熱交換器，第
５端，キャピラリ，第４端，レシーバ上部，主膨張弁，
第１端，逆止弁，第２端，室内熱交換器に冷媒を流し
て、冷房を行える。一方、上記四路切換弁を暖房位置に
すれば、順に、圧縮機，室内熱交換器，第２端，キャピ
ラリ，レシーバ上部，主膨張弁，第１端，逆止弁，第５
端，室外熱交換器に冷媒を流して暖房を行える。According to the sixth aspect of the present invention, if the four-way switching valve is set to the cooling position, the compressor, the outdoor heat exchanger, the fifth end, the capillary, the fourth end, the receiver upper part, the main expansion valve,
Cooling can be performed by flowing a refrigerant through the first end, the check valve, the second end, and the indoor heat exchanger. On the other hand, if the four-way switching valve is set to the heating position, the compressor, the indoor heat exchanger, the second end, the capillary, the receiver upper part, the main expansion valve, the first end, the check valve, and the fifth
At the end, heating can be performed by flowing a refrigerant through the outdoor heat exchanger.

【００２１】ここで、上記第２端と第３端との間のキャ
ピラリと第４端と第５端との間のキャピラリとはレシー
バ上部に接続されているので、一方のキャピラリと他方
のキャピラリとの間には気相冷媒が存在していて両者間
の圧損は液相の圧損に比べて数十倍になる。したがっ
て、上記一方のキャピラリから他方のキャピラリに流れ
る冷媒は、上記一方のキャピラリからレシーバを経て主
膨張弁に流れる冷媒に比べて非常に少なくなる。Here, since the capillary between the second end and the third end and the capillary between the fourth and fifth ends are connected to the upper part of the receiver, one capillary and the other capillary are connected. And the pressure loss between them is several tens of times greater than the pressure loss of the liquid phase. Therefore, the amount of refrigerant flowing from the one capillary to the other capillary is much smaller than the amount of refrigerant flowing from the one capillary to the main expansion valve via the receiver.

【００２２】また、上記請求項６の発明によれば、出荷
時等に上記主膨張弁が閉じられていたときにも、上記２
つのキャピラリが、室内熱交換器と主膨張弁との間の冷
媒回路をレシーバ上部，室外熱交換器に連通させるか
ら、液封を防いで故障を防ぎ、信頼性を高めることがで
きる。According to the sixth aspect of the present invention, even when the main expansion valve is closed at the time of shipping or the like, the above-mentioned 2nd expansion valve can be used.
The two capillaries allow the refrigerant circuit between the indoor heat exchanger and the main expansion valve to communicate with the upper part of the receiver and the outdoor heat exchanger, so that liquid sealing is prevented, failure is prevented, and reliability can be improved.

【００２３】さらには、上記過冷却回路を主膨張弁の下
流から分岐させたから、主膨張弁で膨張させた冷媒を過
冷却回路に導いて、この過冷却回路から圧縮機への液バ
ックを招くことなく、過冷却を行い、信頼性および能力
を向上できる。Further, since the subcooling circuit is branched from the downstream side of the main expansion valve, the refrigerant expanded by the main expansion valve is guided to the subcooling circuit, and the liquid from the subcooling circuit to the compressor is caused. Without supercooling, reliability and performance can be improved.

【００２４】また、請求項７の発明は、室内熱交換器，
圧縮機，室外熱交換器，レシーバ，主膨張弁を接続する
冷媒回路であって、上記圧縮機の吐出側を室外熱交換器
に接続し、上記圧縮機の吸入側を室内熱交換器に接続す
る冷房位置と、上記圧縮機の吐出側を室内熱交換器に接
続し、上記圧縮機の吸入側を室外熱交換器に接続する暖
房位置とに切り替えられる四路切換弁と、上記室内熱交
換器に第２端が接続され、上記レシーバ上部の所定箇所
に第３端が接続され、上記レシーバ上部の別の箇所に第
４端が接続され、上記室外熱交換器に第５端が接続さ
れ、上記主膨張弁に第１端が接続されており、上記第２
端と第３端との間に接続されたキャピラリと、上記第４
端と第５端との間に接続されたキャピラリと、上記第５
端と第１端との間に上記第１端から上記第５端に向かっ
て順方向に接続された逆止弁と、上記第１端と上記第２
端との間に上記第１端から第２端に向かって順方向に接
続された逆止弁とを有する整流回路と、上記主膨張弁の
上流側から分岐して上記圧縮機の吸入側に接続されてい
て、上記レシーバから上記主膨張弁に流れる冷媒を冷や
す過冷却熱交換器とこの過冷却熱交換器の上流側に接続
された過冷却膨張弁とを有した過冷却回路とを備えたこ
とを特徴としている。The invention according to claim 7 is an indoor heat exchanger,
A refrigerant circuit for connecting a compressor, an outdoor heat exchanger, a receiver, and a main expansion valve, wherein a discharge side of the compressor is connected to an outdoor heat exchanger, and a suction side of the compressor is connected to an indoor heat exchanger. A four-way switching valve that is switched to a cooling position, a heating position where the discharge side of the compressor is connected to an indoor heat exchanger, and a suction side of the compressor is connected to an outdoor heat exchanger, and the indoor heat exchange. A second end is connected to the receiver, a third end is connected to a predetermined portion of the upper portion of the receiver, a fourth end is connected to another portion of the upper portion of the receiver, and a fifth end is connected to the outdoor heat exchanger. A first end connected to the main expansion valve, and a second end connected to the second expansion valve;
A capillary connected between the end and the third end;
A capillary connected between the end and the fifth end;
A check valve connected between the first end and the first end in a forward direction from the first end to the fifth end; and a check valve connected to the first end and the second end.
A rectifier circuit having a check valve connected in a forward direction from the first end to the second end between the first and second ends; and a rectifying circuit branched from an upstream side of the main expansion valve to a suction side of the compressor. A supercooling circuit having a supercooling heat exchanger connected to and cooling the refrigerant flowing from the receiver to the main expansion valve and a supercooling expansion valve connected upstream of the supercooling heat exchanger. It is characterized by that.

【００２５】この請求項７の発明は、上記四路切換弁と
上記キャピラリを含んだ整流回路でもって、冷房と暖房
の両方を行え、かつ、冷房，暖房の両方において過冷却
回路を働かせて、能力を向上できる点は上記請求項６の
発明と同じである。According to a seventh aspect of the present invention, a rectifying circuit including the four-way switching valve and the capillary can perform both cooling and heating, and operate a supercooling circuit in both cooling and heating. The point that the capability can be improved is the same as the above-mentioned invention of claim 6.

【００２６】この請求項７の発明が、請求項６の発明と
異なる点は、上記過冷却回路が主膨張弁の上流側から分
岐している点である。これにより、主膨張弁の開度変化
が過冷却回路の過冷却度に影響を与えることを抑制で
き、制御性が良くなる。また、請求項８の発明は、請求
項６または７に記載の冷媒回路において、上記レシーバ
上部と上記過冷却熱交換器の下流側とを連絡する連絡キ
ャピラリを備えたことを特徴としている。The seventh aspect of the present invention differs from the sixth aspect of the present invention in that the supercooling circuit branches off from the upstream side of the main expansion valve. Thereby, it is possible to suppress the change in the opening degree of the main expansion valve from affecting the degree of subcooling of the subcooling circuit, and controllability is improved. An eighth aspect of the present invention is the refrigerant circuit according to the sixth or seventh aspect, further comprising a communication capillary that communicates the upper portion of the receiver with a downstream side of the subcooling heat exchanger.

【００２７】この請求項８の発明によれば、上記連絡キ
ャピラリによって、上記レシーバ上部のガス冷媒を上記
過冷却熱交換器の下流側に導入できるから、圧縮機への
液バックを抑えることができる。According to the eighth aspect of the present invention, since the gas refrigerant in the upper portion of the receiver can be introduced downstream of the supercooling heat exchanger by the communication capillary, liquid back to the compressor can be suppressed. .

【００２８】また、請求項９の発明は、室内熱交換器，
圧縮機，室外熱交換器，レシーバ，主膨張弁を接続する
冷媒回路であって、上記レシーバの上部と上記主膨張弁
の下流側とを連結するキャピラリを備え、上記レシーバ
から上記主膨張弁に流れる冷媒を冷やす過冷却熱交換器
とこの過冷却熱交換器の上流側に接続された過冷却膨張
弁とを有した過冷却回路が、上記主膨張弁の上流側から
分岐して上記圧縮機の吸入側に接続されていることを特
徴としている。The ninth aspect of the present invention provides an indoor heat exchanger,
A refrigerant circuit that connects a compressor, an outdoor heat exchanger, a receiver, and a main expansion valve, the refrigerant circuit including a capillary that connects an upper portion of the receiver and a downstream side of the main expansion valve, from the receiver to the main expansion valve. A supercooling circuit having a supercooling heat exchanger for cooling the flowing refrigerant and a supercooling expansion valve connected to the upstream side of the supercooling heat exchanger branches from the upstream side of the main expansion valve and the compressor It is characterized in that it is connected to the suction side.

【００２９】この請求項９の発明では、上記キャピラリ
でもって、レシーバの上部を主膨張弁の下流側に連通さ
せることによって、出荷時等において、主膨張弁の下流
側回路に封じられた液冷媒を上記キャピラリから上記レ
シーバの上部の気相空間に導入することができる。した
がって、主膨張弁の下流で液封が発生することを防い
で、信頼性を向上できる。また、上記過冷却回路が主膨
張弁の上流側から分岐しているから、主膨張弁の開度変
化が過冷却回路の過冷却度に影響を与えることを抑制で
き、制御性が良くなる。According to the ninth aspect of the present invention, the upper portion of the receiver is communicated with the downstream side of the main expansion valve by the capillary so that the liquid refrigerant sealed in the downstream circuit of the main expansion valve at the time of shipping or the like. Can be introduced from the capillary into the gas phase space above the receiver. Therefore, it is possible to prevent the occurrence of liquid seal downstream of the main expansion valve, and to improve reliability. Further, since the subcooling circuit branches off from the upstream side of the main expansion valve, it is possible to suppress a change in the opening degree of the main expansion valve from affecting the degree of supercooling of the subcooling circuit, thereby improving controllability.

【００３０】また、請求項１０の発明は、室内熱交換
器，圧縮機，室外熱交換器，レシーバ，主膨張弁を接続
する冷媒回路であって、上記レシーバから上記主膨張弁
に流れる冷媒を冷やす過冷却熱交換器とこの過冷却熱交
換器の上流側に接続された過冷却膨張弁とを有した過冷
却回路が、上記主膨張弁の上流側から分岐して上記圧縮
機の吸入側に接続されていて、上記レシーバの上部を、
上記過冷却膨張弁と上記過冷却熱交換器との間に連結す
る連絡キャピラリとを備えたことを特徴としている。A tenth aspect of the present invention is a refrigerant circuit for connecting an indoor heat exchanger, a compressor, an outdoor heat exchanger, a receiver, and a main expansion valve, wherein refrigerant flowing from the receiver to the main expansion valve is provided. A supercooling circuit having a supercooling heat exchanger for cooling and a supercooling expansion valve connected to an upstream side of the supercooling heat exchanger is branched from an upstream side of the main expansion valve to a suction side of the compressor. And the top of the above receiver,
A communication capillary connected between the supercooling expansion valve and the supercooling heat exchanger is provided.

【００３１】この請求項１０の発明では、上記連絡キャ
ピラリから過冷却膨張弁の下流にガス冷媒を導入して、
過冷却熱交換し難い起動時や停止時に過冷却回路から圧
縮機へ液バックすることを防止できる。According to the tenth aspect of the present invention, a gas refrigerant is introduced from the communication capillary downstream of the supercooling expansion valve.
It is possible to prevent the liquid from flowing back from the supercooling circuit to the compressor at the time of starting or stopping when it is difficult to exchange supercooling heat.

【００３２】また、請求項１１の発明は、室内熱交換
器，圧縮機，室外熱交換器，レシーバ，主膨張弁を接続
する冷媒回路であって、上記レシーバから上記主膨張弁
に流れる冷媒を冷やす過冷却熱交換器とこの過冷却熱交
換器の上流側に接続された過冷却膨張弁とを有した過冷
却回路が、上記主膨張弁の下流側から分岐して上記圧縮
機の吸入側に接続されていて、上記レシーバの上部を、
上記過冷却膨張弁と上記過冷却熱交換器との間に連結す
る連絡キャピラリとを備えたことを特徴としている。An eleventh aspect of the present invention is a refrigerant circuit for connecting an indoor heat exchanger, a compressor, an outdoor heat exchanger, a receiver, and a main expansion valve, wherein the refrigerant flowing from the receiver to the main expansion valve is connected to the refrigerant circuit. A supercooling circuit having a supercooling heat exchanger for cooling and a supercooling expansion valve connected to an upstream side of the supercooling heat exchanger branches from a downstream side of the main expansion valve to a suction side of the compressor. And the top of the above receiver,
A communication capillary connected between the supercooling expansion valve and the supercooling heat exchanger is provided.

【００３３】この請求項１１の発明では、上記過冷却回
路が主膨張弁の下流側で分岐していることによって、過
冷却回路による過冷却の増大を図って、能力の向上を図
れる。In the eleventh aspect of the present invention, since the subcooling circuit branches off downstream of the main expansion valve, the supercooling circuit can increase the supercooling and improve the capacity.

【００３４】また、この請求項１１の発明では、前記し
た請求項１０と同様に、上記連絡キャピラリから過冷却
膨張弁の下流にガス冷媒を導入して、過冷却熱交換し難
い起動時や停止時に過冷却回路から圧縮機へ液バックす
ることを防止でき、圧縮機の信頼性を向上できる。According to the eleventh aspect of the present invention, similarly to the tenth aspect, a gas refrigerant is introduced from the communication capillary downstream of the supercooling expansion valve so as to start and stop when it is difficult to exchange supercooling heat. At times, liquid back from the supercooling circuit to the compressor can be prevented, and the reliability of the compressor can be improved.

【００３５】また、請求項１２の発明は、室内熱交換
器，圧縮機，室外熱交換器，レシーバ，主膨張弁を接続
する冷媒回路であって、上記レシーバから上記主膨張弁
に流れる冷媒を冷やす過冷却熱交換器とこの過冷却熱交
換器の上流側に接続された過冷却膨張弁とを有した過冷
却回路が、上記主膨張弁の下流側から分岐して上記圧縮
機の吸入側に接続されていて、上記レシーバの上部を、
上記過冷却熱交換器の下流側に連結する連絡キャピラリ
を備えたことを特徴としている。A twelfth aspect of the present invention is a refrigerant circuit for connecting an indoor heat exchanger, a compressor, an outdoor heat exchanger, a receiver, and a main expansion valve, wherein refrigerant flows from the receiver to the main expansion valve. A supercooling circuit having a supercooling heat exchanger for cooling and a supercooling expansion valve connected to an upstream side of the supercooling heat exchanger branches from a downstream side of the main expansion valve to a suction side of the compressor. And the top of the above receiver,
A communication capillary connected to the downstream side of the supercooling heat exchanger is provided.

【００３６】この請求項１２の発明では、過冷却回路が
主膨張弁の下流側から分岐しているから、過冷却回路に
よる過冷却の増大を図って、能力の向上を図れる。ま
た、上記連絡キャピラリによって、上記レシーバ上部の
ガス冷媒を上記過冷却熱交換器の下流側に導入できるか
ら、圧縮機への液バックを抑えることができる。In the twelfth aspect of the present invention, since the subcooling circuit branches off from the downstream side of the main expansion valve, the supercooling circuit can increase the supercooling and improve the capacity. Further, the gas capillary in the upper part of the receiver can be introduced to the downstream side of the subcooling heat exchanger by the communication capillary, so that liquid back to the compressor can be suppressed.

【００３７】[0037]

【発明の実施の形態】以下、この発明を図示の実施の形
態により詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

【００３８】〔第１実施形態〕図１に、この発明の冷媒
回路の第１実施形態を示す。この実施の形態は、室内熱
交換器１，閉鎖弁２，四路切換弁３，圧縮機５，室外熱
交換器６，ブリッジ整流回路７，レシーバ８，主膨張弁
１０，閉鎖弁１１を備えている。上記閉鎖弁２は、室内
熱交換器１と四路切換弁３との間に接続されている。ま
た、上記室外熱交換器６は、上記四路切換弁３とブリッ
ジ整流回路７との間に接続されている。また、上記閉鎖
弁１１はブリッジ整流回路７と室内熱交換器１との間に
接続されている。[First Embodiment] FIG. 1 shows a first embodiment of a refrigerant circuit according to the present invention. This embodiment includes an indoor heat exchanger 1, a closing valve 2, a four-way switching valve 3, a compressor 5, an outdoor heat exchanger 6, a bridge rectifier circuit 7, a receiver 8, a main expansion valve 10, and a closing valve 11. ing. The closing valve 2 is connected between the indoor heat exchanger 1 and the four-way switching valve 3. Further, the outdoor heat exchanger 6 is connected between the four-way switching valve 3 and the bridge rectifier circuit 7. The closing valve 11 is connected between the bridge rectifier circuit 7 and the indoor heat exchanger 1.

【００３９】そして、上記圧縮機５は、吸入側５Ａが四
路切換弁３の第１端３Ａに接続されており、吐出側５Ｂ
が四路切換弁３の第３端３Ｃに接続されている。また、
上記レシーバ８は、その上部８Ａが上記ブリッジ整流回
路７の第３端７Ｃに接続されており、その底部８Ｂが過
冷却熱交換器１５の被冷却配管１５Ａに接続されてい
る。この被冷却配管１５Ａは、主膨張弁１０に接続され
ている。また、この主膨張弁１０は、ブリッジ整流回路
７の第１端７Ａに接続されている。そして、この主膨張
弁１０と上記第１端７Ａとの接続配管１７と上記レシー
バ８の上部８Ａとの間には連絡キャピラリ２０が接続さ
れている。また、上記接続配管１７には、過冷却用の感
温筒式膨張弁２１が接続され、この膨張弁２１は過冷却
熱交換器１５の冷却配管１５Ｂに接続されている。そし
て、この冷却配管１５Ｂは、圧縮機５の吸入側５Ａに接
続されている。上記過冷却熱交換器１５と感温筒式膨張
弁２１とが過冷却回路３０を構成している。The compressor 5 has a suction side 5A connected to a first end 3A of the four-way switching valve 3, and a discharge side 5B.
Is connected to the third end 3 </ b> C of the four-way switching valve 3. Also,
The receiver 8 has an upper portion 8A connected to the third end 7C of the bridge rectifier circuit 7, and a lower portion 8B connected to a cooled pipe 15A of the subcooling heat exchanger 15. This cooled pipe 15 </ b> A is connected to the main expansion valve 10. The main expansion valve 10 is connected to the first end 7A of the bridge rectifier circuit 7. A connection capillary 20 is connected between a connection pipe 17 between the main expansion valve 10 and the first end 7A and an upper portion 8A of the receiver 8. The connection pipe 17 is connected to a temperature-sensitive cylindrical expansion valve 21 for supercooling, and the expansion valve 21 is connected to a cooling pipe 15B of the supercooling heat exchanger 15. The cooling pipe 15B is connected to the suction side 5A of the compressor 5. The supercooling heat exchanger 15 and the temperature-sensitive cylinder type expansion valve 21 constitute a supercooling circuit 30.

【００４０】上記ブリッジ整流回路７は、その第１端７
Ａから第２端７Ｂに向かって順方向の逆止弁２５と、第
2端７Ｂから第3端７Ｃに向かって順方向の逆止弁２６
と、第３端７Ｃから第４端７Ｄに向かって逆方向の逆止
弁２７と、第４端７Ｄから第１端７Ａに向かって逆方向
の逆止弁２８とで構成されている。The bridge rectifier circuit 7 has a first end 7.
A, a check valve 25 in a forward direction from the second end 7B to the second end 7B;
Check valve 26 in forward direction from second end 7B to third end 7C
And a check valve 27 in the reverse direction from the third end 7C to the fourth end 7D, and a check valve 28 in the reverse direction from the fourth end 7D to the first end 7A.

【００４１】上記構成の冷媒回路によれば、上記四路切
換弁３が図１の実線経路を形成しているときには、冷房
動作を行う。すなわち、圧縮機５が吐出した冷媒は、四
路切換弁３を経由して室外熱交換器６に送出され、この
室外熱交換器６で放熱する。次に、上記室外熱交換器６
で冷やされた冷媒は、ブリッジ整流回路７の第４端７Ｄ
から逆止弁２７に流入し、第３端７Ｃからレシーバ８の
上部８Ａに流入する。そして、このレシーバ８を経て液
相となった冷媒は、過冷却熱交換器１５の被冷却配管１
５Ａに流入して、冷却配管１５Ｂを流れる冷えた冷媒に
よってさらに冷やされて過冷却される。次に、この過冷
却された冷媒は、主膨張弁１０で膨張してから、接続配
管１７の分岐点１７Ａで、ブリッジ整流回路７の第１端
７Ａに向かうメイン流と過冷却用の感温筒式膨張弁２１
に向かう過冷却流とに分岐する。この過冷却流は、上記
感温筒式膨張弁２１で膨張されてから過冷却熱交換器１
５の冷却配管１５Ｂに流入して、被冷却配管１５Ａを流
れる冷媒から熱を奪ってから、圧縮機５の吸入側５Ａに
流入する。According to the refrigerant circuit having the above-described configuration, when the four-way switching valve 3 forms the solid line path in FIG. 1, the cooling operation is performed. That is, the refrigerant discharged from the compressor 5 is sent to the outdoor heat exchanger 6 via the four-way switching valve 3 and radiates heat in the outdoor heat exchanger 6. Next, the outdoor heat exchanger 6
The refrigerant cooled at the fourth end 7D of the bridge rectification circuit 7
From the third end 7C into the upper portion 8A of the receiver 8. The refrigerant that has become a liquid phase through the receiver 8 is connected to the cooled pipe 1 of the subcooling heat exchanger 15.
5A, and further cooled by the cooled refrigerant flowing through the cooling pipe 15B to be supercooled. Next, after the supercooled refrigerant is expanded by the main expansion valve 10, the main flow toward the first end 7 </ b> A of the bridge rectifier circuit 7 at the branch point 17 </ b> A of the connection pipe 17 and the temperature sensitivity for supercooling Cylindrical expansion valve 21
Branches into a supercooled flow towards. The supercooled flow is expanded by the temperature-sensitive cylinder type expansion valve 21 and then cooled by the supercooled heat exchanger 1.
5 flows into the cooling pipe 15B, takes heat from the refrigerant flowing through the pipe 15A to be cooled, and then flows into the suction side 5A of the compressor 5.

【００４２】一方、上記メイン流は、ブリッジ整流回路
７の第１端７Ａから流入して逆止弁２５を経て第２端７
Ｂから流出し、さらに閉鎖弁１１を経て室内熱交換器１
に達し、この室内熱交換器１で吸熱してから、閉鎖弁２
を経由して、四路切換弁３の第２端３Ｂ，第１端３Ａを
経て、圧縮機５の吸入側に流入する。On the other hand, the main flow flows from the first end 7A of the bridge rectifier circuit 7 and passes through the check valve 25 to the second end 7A.
B, and further flows through the closing valve 11 to the indoor heat exchanger 1.
And the heat is absorbed by the indoor heat exchanger 1, and then the closing valve 2
Flows through the second end 3B and the first end 3A of the four-way switching valve 3 into the suction side of the compressor 5.

【００４３】また、上記四路切換弁３が図１の破線経路
を形成しているときには、暖房動作を行う。すなわち、
圧縮機５が吐出した冷媒は、四路切換弁３を経由して室
内熱交換器１に送出され、この室内熱交換器１で放熱す
る。次に、上記室内熱交換器１で冷やされた冷媒は、ブ
リッジ整流回路７の第２端７Ｂから逆止弁２６に流入
し、第３端７Ｃからレシーバ８の上部８Ａに流入する。
そして、このレシーバ８を経て液相となった冷媒は、過
冷却熱交換器１５の被冷却配管１５Ａに流入して、冷却
配管１５Ｂを流れる冷えた冷媒によってさらに冷やされ
て過冷却される。次に、この過冷却された冷媒は、主膨
張弁１０で膨張してから、接続配管１７の分岐点１７Ａ
で、ブリッジ整流回路７の第１端７Ａに向かうメイン流
と過冷却用の感温筒式膨張弁２１に向かう過冷却流とに
分岐する。この過冷却流は、上記感温筒式膨張弁２１で
膨張されてから過冷却熱交換器１５の冷却配管１５Ｂに
流入して、被冷却配管１５Ａを流れる冷媒から熱を奪っ
てから、圧縮機５の吸入側５Ａに流入する。When the four-way switching valve 3 forms the dashed path in FIG. 1, a heating operation is performed. That is,
The refrigerant discharged from the compressor 5 is sent to the indoor heat exchanger 1 via the four-way switching valve 3, and radiates heat in the indoor heat exchanger 1. Next, the refrigerant cooled in the indoor heat exchanger 1 flows into the check valve 26 from the second end 7B of the bridge rectifier circuit 7, and flows into the upper portion 8A of the receiver 8 from the third end 7C.
The refrigerant in the liquid phase after passing through the receiver 8 flows into the cooled pipe 15A of the subcooling heat exchanger 15, and is further cooled and cooled by the cooled refrigerant flowing through the cooling pipe 15B. Next, after the supercooled refrigerant expands in the main expansion valve 10, the branch point 17A
Then, the flow branches into a main flow toward the first end 7A of the bridge rectifier circuit 7 and a supercooled flow toward the temperature-sensitive cylindrical expansion valve 21 for supercooling. The supercooled flow is expanded by the temperature-sensitive cylinder type expansion valve 21 and then flows into the cooling pipe 15B of the supercooling heat exchanger 15 to remove heat from the refrigerant flowing through the pipe 15A to be cooled, and 5 into the suction side 5A.

【００４４】一方、上記メイン流は、ブリッジ整流回路
７の第１端７Ａから流入して逆止弁２８を経て第４端７
Ｂから流出し、室外熱交換器６に達し、この室外熱交換
器６で吸熱してから、四路切換弁３の第４端３Ｄ，第１
端３Ａを経て、圧縮機５の吸入側に流入する。この実施
の形態では、連絡キャピラリ２０がレシーバ８の上部８
Ａと主膨張弁１０の下流側とを連絡する。したがって、
出荷時等に、閉じた閉鎖弁２，逆止弁２６，レシーバ
８，被冷却配管１５Ａ，主膨張弁１０の間に封じられた
液冷媒を、レシーバ８の上部８Ａから連絡キャピラリ２
０を経由して主膨張弁１０の下流の回路に導入できる。
したがって、冷媒の液封を防いで、異常な圧力上昇によ
る故障を防ぎ、信頼性の向上を図れる。On the other hand, the main flow flows from the first end 7A of the bridge rectifier circuit 7 and passes through the check valve 28 to the fourth end 7A.
B, reaches the outdoor heat exchanger 6, absorbs heat in the outdoor heat exchanger 6, and then returns to the fourth end 3D of the four-way switching valve 3, the first end 3D.
Through the end 3A, it flows into the suction side of the compressor 5. In this embodiment, the communication capillary 20 is connected to the upper part 8 of the receiver 8.
A communicates with the downstream side of the main expansion valve 10. Therefore,
At the time of shipment or the like, the liquid refrigerant sealed between the closed shut-off valve 2, the check valve 26, the receiver 8, the pipe 15A to be cooled, and the main expansion valve 10 is transferred from the upper part 8A of the receiver 8 to the communication capillary 2.
0 can be introduced into a circuit downstream of the main expansion valve 10.
Therefore, liquid sealing of the refrigerant is prevented, failure due to abnormal pressure rise is prevented, and reliability can be improved.

【００４５】また、この実施の形態では、上記過冷却回
路３０が主膨張弁１０の下流から分岐しているから、主
膨張弁１０で膨張した気相冷媒を過冷却回路３０に導入
できる。したがって、過冷却しにくい起動時や停止時に
上記過冷却回路３０から圧縮機５への過渡的な液バック
を防止でき、圧縮機５の故障を防いで信頼性を向上でき
る。In this embodiment, since the subcooling circuit 30 branches off from the downstream side of the main expansion valve 10, the gas-phase refrigerant expanded by the main expansion valve 10 can be introduced into the subcooling circuit 30. Therefore, at the time of starting or stopping when it is difficult to perform supercooling, transient liquid back from the supercooling circuit 30 to the compressor 5 can be prevented, and failure of the compressor 5 can be prevented and reliability can be improved.

【００４６】また、この実施の形態では、四路切換弁３
を冷房位置(実線)にすれば、冷媒を圧縮機５から室外熱
交換器６，整流回路７，レシーバ８，主膨張弁１０，室
内熱交換器２の順に流して、冷房を行える。一方、四路
切換弁３を暖房位置(破線)にすれば、冷媒を圧縮機５か
ら室内熱交換器６，整流回路７，レシーバ８，主膨張弁
１０，室外熱交換器６の順に流して暖房を行える。さら
に、上記冷房時，暖房時の両方において、上記過冷却回
路３０を働かせて、過冷却による能力向上を図れる。ま
た、この実施の形態では、上記感温筒式膨張弁２１の感
温筒２１Ａでもって、過冷却熱交換器１５の出口での冷
媒温度を検出し、この冷媒温度の高低に応じて、感温筒
式膨張弁２１の開度を大小に調節して、過冷却度を所定
の値に維持できる。In this embodiment, the four-way switching valve 3
Is set to the cooling position (solid line), cooling can be performed by flowing the refrigerant from the compressor 5 to the outdoor heat exchanger 6, the rectifier circuit 7, the receiver 8, the main expansion valve 10, and the indoor heat exchanger 2 in this order. On the other hand, if the four-way switching valve 3 is set to the heating position (broken line), the refrigerant flows from the compressor 5 in the order of the indoor heat exchanger 6, the rectifier circuit 7, the receiver 8, the main expansion valve 10, and the outdoor heat exchanger 6. Heating can be done. Further, in both the cooling and the heating, the supercooling circuit 30 is operated to improve the performance by the supercooling. Further, in this embodiment, the temperature of the refrigerant at the outlet of the subcooling heat exchanger 15 is detected by the temperature-sensitive cylinder 21A of the temperature-sensitive cylinder type expansion valve 21, and the temperature is detected in accordance with the level of the refrigerant temperature. The degree of supercooling can be maintained at a predetermined value by adjusting the degree of opening of the warm cylinder type expansion valve 21 to be large or small.

【００４７】〔第２実施形態〕次に、図２(Ａ)に、この
発明の第２実施形態を示す。この第２実施形態は、ブリ
ッジ整流回路の構成だけが、上記第１実施形態と異な
る。したがって、この第２実施形態では、第１実施形態
と異なる点について重点的に説明する。[Second Embodiment] Next, FIG. 2A shows a second embodiment of the present invention. The second embodiment differs from the first embodiment only in the configuration of the bridge rectifier circuit. Therefore, in the second embodiment, points different from the first embodiment will be mainly described.

【００４８】すなわち、この第２実施形態では、ブリッ
ジ整流回路４１の第２端４１Ｂとレシーバ８の上部８Ａ
の所定箇所８Ａ−１との間に、逆止弁に換えてキャピラ
リ４２が接続されている。この所定箇所８Ａ−１が第３
端４１Ｃをなす。また、上記所定箇所８Ａ−１と所定距
離だけ離れたレシーバ上部箇所８Ａ−２(第４端４１Ｄ)
と第４端４１Ｅとの間にキャピラリ４３が接続されてい
る。そして、逆止弁２５，キャピラリ４２，キャピラリ
４３，逆止弁２８がブリッジ整流回路４１を構成してい
る。That is, in the second embodiment, the second end 41B of the bridge rectifier circuit 41 and the upper portion 8A of the receiver 8
The capillary 42 is connected to the predetermined location 8A-1 in place of the check valve. This predetermined location 8A-1 is the third
The end 41C is formed. Further, a receiver upper portion 8A-2 (fourth end 41D) separated from the predetermined portion 8A-1 by a predetermined distance.
The capillary 43 is connected between the first end and the fourth end 41E. The check valve 25, the capillary 42, the capillary 43, and the check valve 28 constitute a bridge rectifier circuit 41.

【００４９】この第２実施形態では、第１端４１Ａと第
２端４１Ｂとの間のキャピラリ４２と第４端４１Ｄと第
５端４１Ｅとの間のキャピラリ４３とはレシーバ上部８
Ａの異なる箇所８Ａ−１，８Ａ−２に接続されているの
で、一方のキャピラリ４２と他方のキャピラリ４３との
間には気相冷媒が存在していて両者間の圧損は液相の圧
損に比べて数十倍になる。したがって、上記キャピラリ
４２，４３からキャピラリ４３，４２に流れる冷媒は、
上記キャピラリ４２，４３からレシーバ８を経て主膨張
弁１０に流れる冷媒に比べて非常に少なくなる。これに
より、上記ブリッジ整流回路４１は第１実施形態の整流
回路７と略同等の整流動作を果たせるのである。また、
この第２実施形態によれば、キャピラリ４３がレシーバ
上部８Ａを主膨張弁１０の下流側の回路に連通させるか
ら、この実施の形態では、したがって、出荷時等に、主
膨張弁１０が閉じられていて、閉じた閉鎖弁２，キャピ
ラリ４２，レシーバ８，被冷却配管１５Ａ，主膨張弁１
０の間に封じられた液冷媒を、レシーバ８の上部８Ａか
らキャピラリ４３を経由して主膨張弁１０の下流の回路
に導入できる。したがって、冷媒の液封を防いで、異常
な圧力上昇による故障を防ぎ、信頼性の向上を図れる。In the second embodiment, the capillary 42 between the first end 41A and the second end 41B and the capillary 43 between the fourth end 41D and the fifth end 41E are connected to the upper part 8 of the receiver.
A is connected to different points 8A-1 and 8A-2 of A, so that a gas-phase refrigerant exists between one capillary 42 and the other capillary 43, and the pressure loss between the two is a liquid-phase pressure loss. It is several tens of times in comparison. Therefore, the refrigerant flowing from the capillaries 42, 43 to the capillaries 43, 42 is:
The amount of refrigerant flowing from the capillaries 42 and 43 via the receiver 8 to the main expansion valve 10 is extremely small. As a result, the bridge rectifier circuit 41 can perform a rectification operation substantially equivalent to that of the rectifier circuit 7 of the first embodiment. Also,
According to the second embodiment, since the capillary 43 connects the receiver upper portion 8A to a circuit downstream of the main expansion valve 10, in this embodiment, therefore, the main expansion valve 10 is closed at the time of shipping or the like. Closed valve 2, capillary 42, receiver 8, pipe 15A to be cooled, main expansion valve 1
The liquid refrigerant sealed during zero can be introduced from the upper part 8A of the receiver 8 into the circuit downstream of the main expansion valve 10 via the capillary 43. Therefore, liquid sealing of the refrigerant is prevented, failure due to abnormal pressure rise is prevented, and reliability can be improved.

【００５０】尚、この第２実施形態において、ブリッジ
整流回路４１の第２端４１Ｂから第３端４１Ｃに向かっ
て順方向の逆止弁をキャピラリ４２と並列に接続し、第
４端４１Ｄから第５端４１Ｅに向かって逆方向の逆止弁
をキャピラリ４３と並列に接続した場合には、上記逆止
弁もしくはキャピラリのいずれかが故障した場合にも整
流回路の機能を維持でき、信頼性を向上できる。In this second embodiment, a check valve in the forward direction from the second end 41B to the third end 41C of the bridge rectifier circuit 41 is connected in parallel with the capillary 42, and the fourth end 41D is connected to the fourth end 41D. When a check valve in the reverse direction toward the fifth end 41E is connected in parallel with the capillary 43, the function of the rectifier circuit can be maintained even if either the check valve or the capillary fails, and reliability is improved. Can be improved.

【００５１】〔第３実施形態〕次に、図２(Ｂ)に、この
発明の第３実施形態を示す。この第３実施形態は、主膨
張弁１０の上流側から過冷却回路３０が分岐している点
だけが、第２実施形態と異なる。したがって、この第３
実施形態では、第２実施形態と異なる点だけを重点的に
説明する。[Third Embodiment] FIG. 2B shows a third embodiment of the present invention. The third embodiment differs from the second embodiment only in that a subcooling circuit 30 branches from the upstream side of the main expansion valve 10. Therefore, this third
In the embodiment, only the points different from the second embodiment will be mainly described.

【００５２】この第３実施形態では、主膨張弁１０の開
度変化が過冷却回路３０の過冷却度に影響を与えること
を抑制でき、制御性が良くなる。In the third embodiment, it is possible to suppress a change in the opening degree of the main expansion valve 10 from affecting the degree of supercooling of the subcooling circuit 30, thereby improving controllability.

【００５３】尚、この第３実施形態において、ブリッジ
整流回路４１の第２端４１Ｂから第３端４１Ｃに向かっ
て順方向の逆止弁をキャピラリ４２と並列に接続し、第
４端４１Ｄから第５端４１Ｅに向かって逆方向の逆止弁
をキャピラリ４３と並列に接続した場合には、上記逆止
弁もしくはキャピラリのいずれかが故障した場合にも整
流回路の機能を維持でき、信頼性を向上できる。In the third embodiment, a check valve in the forward direction from the second end 41B to the third end 41C of the bridge rectifier circuit 41 is connected in parallel with the capillary 42, and the fourth end 41D is connected to the fourth end 41D. When a check valve in the reverse direction toward the fifth end 41E is connected in parallel with the capillary 43, the function of the rectifier circuit can be maintained even if either the check valve or the capillary fails, and reliability is improved. Can be improved.

【００５４】〔第４実施形態〕次に、図２(Ｃ)に、この
発明の第４実施形態を示す。この第４実施形態が、先述
の第１実施形態と異なる点は、主膨張弁１０の上流側か
ら過冷却回路３０が分岐している点と、連絡キャピラリ
５１がレシーバ８上部８Ａと過冷却熱交換器冷却配管１
５Ｂと感温筒２１Ａとの間の冷媒配管５２に接続されて
いる点の２点だけである。[Fourth Embodiment] FIG. 2C shows a fourth embodiment of the present invention. The fourth embodiment differs from the first embodiment in that the supercooling circuit 30 branches off from the upstream side of the main expansion valve 10 and that the communication capillary 51 is connected to the upper portion 8A of the receiver 8 and the supercooling heat. Exchanger cooling piping 1
Only two points are connected to the refrigerant pipe 52 between 5B and the temperature sensing cylinder 21A.

【００５５】この第４実施形態によれば、レシーバ８上
部８Ａのガス冷媒を連絡キャピラリ５１から冷媒配管５
２に供給することで、感温筒２１Ａが検知する温度を高
くして、感温筒式膨張弁２１の開度を大き目にすること
ができる。これにより、過冷却回路３０による過冷却度
を増大させて、能力の向上を図れる。According to the fourth embodiment, the gas refrigerant in the upper portion 8A of the receiver 8 is transferred from the communication capillary 51 to the refrigerant pipe 5A.
2, the temperature detected by the temperature-sensitive cylinder 21A can be increased, and the degree of opening of the temperature-sensitive cylinder type expansion valve 21 can be increased. Thereby, the degree of supercooling by the subcooling circuit 30 is increased, and the performance can be improved.

【００５６】また、上記連絡キャピラリ５１から過冷却
熱交換器１５の下流側に温度の高いガス冷媒を導入する
ことで、圧縮機５の吸入側への液バックを抑えることが
できる。Further, by introducing a high-temperature gas refrigerant from the communication capillary 51 to the downstream side of the subcooling heat exchanger 15, liquid back to the suction side of the compressor 5 can be suppressed.

【００５７】〔第５実施形態〕次に、図３(Ａ)に、この
発明の第５実施形態を示す。この第５実施形態は、連絡
キャピラリ６１が、レシーバ上部８Ａから、過冷却用の
膨張弁２１と過冷却配管１５Ｂとの間の冷媒配管６２に
接続されている点だけが第４実施形態と異なる。[Fifth Embodiment] Next, FIG. 3A shows a fifth embodiment of the present invention. The fifth embodiment is different from the fourth embodiment only in that a communication capillary 61 is connected from a receiver upper portion 8A to a refrigerant pipe 62 between the supercooling expansion valve 21 and the supercooling pipe 15B. .

【００５８】この第５実施形態では、連絡キャピラリ６
１から過冷却用の膨張弁２１の下流にガス冷媒を導入し
て、過冷却熱交換し難い起動時や停止時に過冷却回路３
０から圧縮機５へ液バックすることを防止できる。In the fifth embodiment, the connecting capillary 6
1 to the downstream of the supercooling expansion valve 21, the supercooling circuit 3 is used at the time of starting or stopping when it is difficult to exchange supercooling heat.
Liquid back from 0 to the compressor 5 can be prevented.

【００５９】〔第６実施形態〕次に、図３(Ｂ)に、この
発明の第６実施形態を示す。この第６実施形態は、主膨
張弁１０の上流側から過冷却回路３０が分岐している点
だけが、第１実施形態と異なる。この第６実施形態で
は、主膨張弁１０の開度変化が過冷却回路３０の過冷却
度に影響を与えることを抑制できる。[Sixth Embodiment] Next, FIG. 3B shows a sixth embodiment of the present invention. The sixth embodiment is different from the first embodiment only in that the subcooling circuit 30 branches from the upstream side of the main expansion valve 10. In the sixth embodiment, it is possible to suppress a change in the opening degree of the main expansion valve 10 from affecting the degree of supercooling of the subcooling circuit 30.

【００６０】〔第７実施形態〕次に、図３(Ｃ)に、この
発明の第７実施形態を示す。この第７実施形態は、連絡
キャピラリ７１がレシーバ上部８Ａを過冷却用の膨張弁
２１と過冷却配管１５Ｂとの間の冷媒配管７２に接続し
ている点だけが、上述の第１実施形態と異なる。[Seventh Embodiment] Next, FIG. 3C shows a seventh embodiment of the present invention. The seventh embodiment differs from the first embodiment only in that the communication capillary 71 connects the receiver upper portion 8A to the refrigerant pipe 72 between the supercooling expansion valve 21 and the supercooling pipe 15B. different.

【００６１】この第７実施形態では、連絡キャピラリ７
１から過冷却用の膨張弁２１の下流にガス冷媒を導入し
て、過冷却熱交換し難い起動時や停止時に過冷却回路３
０から圧縮機５へ液バックすることを防止できる。した
がって、圧縮機５の信頼性を向上させることができる。In the seventh embodiment, the connecting capillary 7
1 to the downstream of the supercooling expansion valve 21, the supercooling circuit 3 is used at the time of starting or stopping when it is difficult to exchange supercooling heat.
Liquid back from 0 to the compressor 5 can be prevented. Therefore, the reliability of the compressor 5 can be improved.

【００６２】尚、上記第１〜第７実施形態において、圧
縮機３を停止させる１０秒〜２０秒前から主電動弁１０
を全閉にしてレシーバ８にポンプダウンすることによっ
て、過渡時の圧縮機３への液バックを防止できる。ま
た、起動時には、レシーバ８に液冷媒が溜まっているの
で、主電動弁１０を徐々に開いて、圧縮機３に液バック
しないようにすれば良い。In the first to seventh embodiments, the main motor-operated valve 10 starts 10 seconds to 20 seconds before the compressor 3 is stopped.
Is fully closed and the pump is pumped down to the receiver 8, it is possible to prevent liquid back to the compressor 3 at the time of transition. Further, at the time of startup, since the liquid refrigerant is stored in the receiver 8, the main motor-operated valve 10 may be gradually opened so that the liquid does not flow back to the compressor 3.

【００６３】また、デフロスト(除霜)運転に入る１０秒
〜２０秒前に主電動弁１０を全閉(もしくは小開度)にす
ると共に、デフロスト中には主電動弁１０の開度を一定
の開度に保つことによって、デフロスト開始時の圧縮機
５への過渡的な液バックを防止できる。The main motor-operated valve 10 is fully closed (or has a small opening) 10 to 20 seconds before the defrost (defrost) operation is started, and the opening of the main motor-operated valve 10 is kept constant during defrosting. By maintaining the opening degree, it is possible to prevent transient liquid back to the compressor 5 at the start of defrost.

【００６４】また、上記実施の形態では、冷媒としてＲ
４０７Ｃを用いたが、Ｒ２２等他の冷媒を使用しても良
い。もっとも、Ｒ４０７Ｃを用いた場合には、Ｒ４０７
Ｃ(非共沸混合冷媒)の特徴を最大限に生かして、過渡時
の信頼性を飛躍的に向上できると共に、能力とＣＯＰを
向上できる。In the above embodiment, the refrigerant is R
Although 407C was used, other refrigerants such as R22 may be used. However, when R407C is used, R407
By taking full advantage of the characteristics of C (non-azeotropic refrigerant mixture), the reliability during transition can be dramatically improved, and the capacity and COP can be improved.

【００６５】[0065]

【発明の効果】以上より明らかなように、この発明の請
求項１の発明の冷媒回路は、室内熱交換器，圧縮機，室
外熱交換器，レシーバ，主膨張弁を接続する冷媒回路で
あって、上記レシーバの上部と上記主膨張弁の下流側と
を連結するキャピラリを備えている。As is clear from the above, the refrigerant circuit according to the first aspect of the present invention is a refrigerant circuit for connecting an indoor heat exchanger, a compressor, an outdoor heat exchanger, a receiver, and a main expansion valve. And a capillary connecting the upper part of the receiver and the downstream side of the main expansion valve.

【００６６】この請求項１の冷媒回路では、上記キャピ
ラリがレシーバの上部と主膨張弁の下流側とを連絡する
から、出荷時等において主膨張弁の下流で液封が発生す
ることを防いで、信頼性を向上できる。In the refrigerant circuit of the first aspect, since the capillary communicates the upper portion of the receiver with the downstream side of the main expansion valve, it is possible to prevent the occurrence of liquid seal downstream of the main expansion valve at the time of shipping or the like. , Reliability can be improved.

【００６７】また、請求項２の冷媒回路は、過冷却回路
が、主膨張弁の下流側から分岐して圧縮機の吸入側に接
続されている。この請求項２の発明では、上記過冷却回
路が主膨張弁の下流から分岐しているから、主膨張弁で
膨張した気相冷媒を過冷却回路に導入できる。したがっ
て、過冷却し難い起動時や停止時に過冷却回路から圧縮
機への過渡的な液バックを防止でき、圧縮機の信頼性を
向上できる。Further, in the refrigerant circuit according to the second aspect, the subcooling circuit is branched from the downstream side of the main expansion valve and connected to the suction side of the compressor. According to the second aspect of the present invention, since the subcooling circuit branches off from the downstream side of the main expansion valve, the gas-phase refrigerant expanded by the main expansion valve can be introduced into the subcooling circuit. Therefore, it is possible to prevent a transient liquid back from the supercooling circuit to the compressor at the time of starting or stopping when it is difficult to supercool, and it is possible to improve the reliability of the compressor.

【００６８】また、請求項３の冷媒回路は、レシーバの
上部と主膨張弁の下流側とを連結するキャピラリでもっ
て、出荷時等において、主膨張弁の下流側に封じられた
液冷媒を、レシーバの上部の気相空間に導入することが
でき、冷媒の液封を防いで、信頼性を向上できる。Further, the refrigerant circuit according to the third aspect of the present invention uses a capillary connecting the upper part of the receiver and the downstream side of the main expansion valve to supply the liquid refrigerant sealed downstream of the main expansion valve at the time of shipping or the like. It can be introduced into the gaseous space above the receiver, preventing liquid refrigerant from being sealed and improving reliability.

【００６９】また、この請求項３の発明は、過冷却回路
が主膨張弁の下流から分岐しているから、主膨張弁で膨
張した気相冷媒を過冷却回路に導入して、過冷却し難い
起動時や停止時に過冷却回路から圧縮機への過渡的な液
バックを防止でき、圧縮機の信頼性を向上できる。According to the third aspect of the present invention, since the subcooling circuit branches off from the downstream side of the main expansion valve, the gaseous refrigerant expanded by the main expansion valve is introduced into the subcooling circuit to perform subcooling. Transient liquid back from the supercooling circuit to the compressor during difficult starting and stopping can be prevented, and the reliability of the compressor can be improved.

【００７０】さらには、上記キャピラリと上記過冷却回
路を経由して、上記レシーバ上部から上記圧縮機の吸入
側にガス冷媒を供給できるから、圧縮機のガス欠を防止
でき、信頼性を向上できる。Further, a gas refrigerant can be supplied from the upper part of the receiver to the suction side of the compressor via the capillary and the subcooling circuit, so that the compressor can be prevented from running out of gas and the reliability can be improved. .

【００７１】また、請求項４の発明は、請求項１乃至３
のいずれか１つに記載の冷媒回路において、四路切換弁
と、整流回路とを備え、上記四路切換弁を冷房位置にす
れば、冷媒を圧縮機から室外熱交換器，整流回路，レシ
ーバ，主膨張弁，室内熱交換器の順に流して、冷房を行
える。一方、上記四路切換弁を暖房位置にすれば、冷媒
を圧縮機から室内熱交換器，整流回路，レシーバ，主膨
張弁，室外熱交換器の順に流して、暖房を行える。ま
た、上記冷房時，暖房時の両方において、過冷却回路を
働かせて、過冷却による能力向上を図れる。The invention according to claim 4 is the invention according to claims 1 to 3
The refrigerant circuit according to any one of the above, further comprising a four-way switching valve and a rectifier circuit, wherein the refrigerant is transferred from the compressor to the outdoor heat exchanger, the rectifier circuit, and the receiver by setting the four-way selector valve to the cooling position. , The main expansion valve, and the indoor heat exchanger in that order to perform cooling. On the other hand, if the four-way switching valve is set to the heating position, the refrigerant can be heated by flowing the refrigerant from the compressor in the order of the indoor heat exchanger, the rectifier circuit, the receiver, the main expansion valve, and the outdoor heat exchanger. In addition, in both the above-mentioned cooling and heating, the supercooling circuit is activated to improve the performance by the supercooling.

【００７２】また、請求項５の発明は、請求項１乃至４
のいずれか１つに記載の冷媒回路において、過冷却膨張
弁は、過冷却熱交換器の出口での過冷却回路の温度に応
じて開度が変化する感温筒式膨張弁である。この請求項
５の発明では、感温筒式膨張弁でもって、過冷却熱交換
器の出口での冷媒温度の高低に応じて、過冷却膨張弁の
開度を大小に調節して、過冷却度を所定の値に維持でき
る。Further, the invention of claim 5 is the invention of claims 1 to 4
In the refrigerant circuit according to any one of the above, the supercooling expansion valve is a temperature-sensitive cylinder type expansion valve whose opening degree changes according to the temperature of the supercooling circuit at the outlet of the supercooling heat exchanger. According to the fifth aspect of the present invention, the degree of opening of the supercooling expansion valve is adjusted by the temperature-sensitive cylinder type expansion valve according to the refrigerant temperature at the outlet of the supercooling heat exchanger, and the supercooling is performed. The degree can be maintained at a predetermined value.

【００７３】また、請求項６の発明は、四路切換弁を冷
房位置にすれば、順に、圧縮機，室外熱交換器，整流回
路の第５端，整流回路のキャピラリ，整流回路の第４
端，レシーバ上部，主膨張弁，整流回路の第１端，整流
回路の逆止弁，整流回路の第２端，室内熱交換器に冷媒
を流して冷房を行える。一方、四路切換弁を暖房位置に
すれば、順に、圧縮機，室内熱交換器，第２端，キャピ
ラリ，レシーバ上部，主膨張弁，第１端，逆止弁，第５
端，室外熱交換器に冷媒を流して、暖房を行える。ここ
で、第２端と第３端との間のキャピラリと第４端と第５
端との間のキャピラリとはレシーバ上部に接続されてい
るので、一方のキャピラリと他方のキャピラリとの間に
は気相冷媒が存在していて両者間の圧損は液相の圧損に
比べて数十倍になる。したがって、上記一方のキャピラ
リから他方のキャピラリに流れる冷媒は、一方のキャピ
ラリからレシーバを経て主膨張弁に流れる冷媒に比べて
非常に少なくなる。Further, when the four-way switching valve is set to the cooling position, the compressor, the outdoor heat exchanger, the fifth end of the rectifier circuit, the capillary of the rectifier circuit, and the fourth terminal of the rectifier circuit are arranged in this order.
The cooling can be performed by flowing the refrigerant through the end, the upper portion of the receiver, the main expansion valve, the first end of the rectifier circuit, the check valve of the rectifier circuit, the second end of the rectifier circuit, and the indoor heat exchanger. On the other hand, if the four-way switching valve is set to the heating position, the compressor, the indoor heat exchanger, the second end, the capillary, the receiver upper part, the main expansion valve, the first end, the check valve, and the fifth
At the end, the refrigerant can flow through the outdoor heat exchanger for heating. Here, the capillary between the second end and the third end, the fourth end and the fifth end
Since the capillary between the ends is connected to the upper part of the receiver, there is a gas-phase refrigerant between one capillary and the other capillary, and the pressure loss between the two is smaller than the pressure loss of the liquid phase. 10 times. Therefore, the amount of the refrigerant flowing from the one capillary to the other capillary is much smaller than the amount of the refrigerant flowing from the one capillary to the main expansion valve via the receiver.

【００７４】また、この請求項６の発明によれば、出荷
時等に上記主膨張弁が閉じられていたときにも、上記２
つのキャピラリが、主膨張弁の下流側の回路をレシーバ
上部に連通させるから、液封を防いで故障を防ぎ、信頼
性を高めることができる。さらには、過冷却回路を主膨
張弁の下流から分岐させたから、この過冷却回路から圧
縮機への液バックを招くことなく、過冷却を行って、信
頼性および能力を向上させることができる。According to the sixth aspect of the present invention, even when the main expansion valve is closed at the time of shipping or the like, the above-mentioned 2nd expansion valve can be used.
Since the two capillaries communicate the circuit downstream of the main expansion valve with the upper part of the receiver, liquid sealing can be prevented, failure can be prevented, and reliability can be improved. Furthermore, since the subcooling circuit is branched from the downstream side of the main expansion valve, the supercooling can be performed without causing liquid back from the subcooling circuit to the compressor, thereby improving reliability and performance.

【００７５】また、請求項７の発明は、上記四路切換弁
と上記キャピラリを含んだ整流回路でもって、冷房と暖
房の両方を行え、かつ、冷房，暖房の両方において過冷
却回路を働かせて、能力を向上できる点は上記請求項６
の発明と同じである。Further, according to the invention of claim 7, both the cooling and the heating can be performed by the rectifying circuit including the four-way switching valve and the capillary, and the supercooling circuit operates in both the cooling and the heating. Claim 6 is that the ability can be improved.
The invention is the same as the invention of

【００７６】この請求項７の発明が、請求項６の発明と
異なる点は、上記過冷却回路が主膨張弁の上流側から分
岐している点である。これにより、主膨張弁の開度変化
が過冷却回路の過冷却度に影響を与えることが抑えら
れ、制御性が良くなる。The seventh aspect of the present invention differs from the sixth aspect of the present invention in that the supercooling circuit branches off from the upstream side of the main expansion valve. This suppresses a change in the opening degree of the main expansion valve from affecting the degree of supercooling of the subcooling circuit, and improves controllability.

【００７７】また、請求項８の発明は、請求項６または
７に記載の冷媒回路において、レシーバ上部と過冷却熱
交換器の下流側とを連絡する連絡キャピラリを備えた。The invention according to claim 8 is the refrigerant circuit according to claim 6 or 7, further comprising a communication capillary for communicating an upper portion of the receiver and a downstream side of the subcooling heat exchanger.

【００７８】この請求項８の発明によれば、連絡キャピ
ラリによって、レシーバ上部のガス冷媒を過冷却熱交換
器の下流側に導入できるから、圧縮機への液バックを抑
えることができ、信頼性を向上できる。According to the eighth aspect of the present invention, the gas capillary at the upper portion of the receiver can be introduced downstream of the supercooling heat exchanger by the communication capillary, so that the liquid back to the compressor can be suppressed, and the reliability can be improved. Can be improved.

【００７９】また、請求項９の発明は、レシーバの上部
と主膨張弁の下流側とを連結するキャピラリを備え、過
冷却回路が主膨張弁の上流側から分岐して圧縮機の吸入
側に接続されている。この請求項９の発明では、キャピ
ラリでもって、レシーバの上部を主膨張弁の下流側に連
通させることによって、出荷時等において、主膨張弁の
下流側冷媒回路に封じられた液冷媒をレシーバ上部の気
相空間に導入することができ、液封を防止できる。ま
た、上記過冷却回路が主膨張弁の上流側から分岐してい
るから、過冷却回路が主膨張弁の下流側から分岐してい
る場合に比べて、最大過冷却度を大きく設定できる。The ninth aspect of the present invention comprises a capillary connecting the upper part of the receiver and the downstream side of the main expansion valve, and the supercooling circuit branches from the upstream side of the main expansion valve to the suction side of the compressor. It is connected. According to the ninth aspect of the present invention, the upper portion of the receiver is communicated with the downstream side of the main expansion valve by a capillary, so that the liquid refrigerant sealed in the downstream side refrigerant circuit of the main expansion valve can be transferred to the upper portion of the receiver at the time of shipping or the like. Can be introduced into the gas phase space, and liquid sealing can be prevented. Further, since the subcooling circuit branches off from the upstream side of the main expansion valve, the maximum degree of subcooling can be set larger than when the subcooling circuit branches off from the downstream side of the main expansion valve.

【００８０】また、請求項１０の発明は、レシーバ上部
を過冷却膨張弁と過冷却熱交換器との間に連結する連絡
キャピラリとを備えた。この請求項１０の発明では、連
絡キャピラリから過冷却膨張弁の下流にガス冷媒を導入
して、過冷却熱交換し難い起動時や停止時に過冷却回路
から圧縮機へ液バックすることを防止できる。The invention according to claim 10 is provided with a communication capillary connecting the upper portion of the receiver between the supercooling expansion valve and the supercooling heat exchanger. According to the tenth aspect of the present invention, the gas refrigerant is introduced from the communication capillary to the downstream of the supercooling expansion valve, so that the liquid can be prevented from flowing back from the supercooling circuit to the compressor at the time of starting or stopping when it is difficult to exchange supercooling heat. .

【００８１】また、請求項１１の発明は、過冷却回路
が、主膨張弁の下流側から分岐して圧縮機の吸入側に接
続されていて、レシーバの上部を過冷却膨張弁と過冷却
熱交換器との間に連結する連絡キャピラリとを備えた。
この請求項１１の発明では、過冷却回路が主膨張弁の下
流側で分岐していることによって、過冷却回路による過
冷却の増大を図って、能力の向上を図れる。According to an eleventh aspect of the present invention, the supercooling circuit is branched from the downstream side of the main expansion valve and connected to the suction side of the compressor, and the upper part of the receiver is connected to the supercooling expansion valve and the supercooling heat source. A communication capillary connected to the exchanger.
According to the eleventh aspect of the present invention, since the subcooling circuit is branched downstream of the main expansion valve, the supercooling circuit can increase the supercooling and improve the capacity.

【００８２】また、この請求項１１の発明では、前記請
求項１０と同様に、連絡キャピラリから過冷却膨張弁の
下流にガス冷媒を導入して、過冷却熱交換し難い起動時
や停止時に過冷却回路から圧縮機へ液バックすることを
防止でき、圧縮機の信頼性を向上できる。According to the eleventh aspect of the present invention, similarly to the tenth aspect, a gas refrigerant is introduced from the communication capillary downstream of the supercooling expansion valve so that the supercooling heat exchange is difficult at the time of starting or stopping. Liquid back from the cooling circuit to the compressor can be prevented, and the reliability of the compressor can be improved.

【００８３】また、請求項１２の発明は、過冷却回路
が、主膨張弁の下流側から分岐して圧縮機の吸入側に接
続されていて、レシーバの上部を過冷却熱交換器の下流
側に連結する連絡キャピラリを備えている。According to a twelfth aspect of the present invention, the subcooling circuit is branched from the downstream side of the main expansion valve and connected to the suction side of the compressor, and the upper part of the receiver is connected to the downstream side of the subcooling heat exchanger. It has a communication capillary connected to.

【００８４】この請求項１２の発明では、過冷却回路が
主膨張弁の下流側から分岐しているから、過冷却回路に
よる過冷却の増大を図って、能力の向上を図れる。ま
た、連絡キャピラリによって、レシーバ上部のガス冷媒
を過冷却熱交換器の下流側に導入できるから、圧縮機へ
の液バックを抑えて、信頼性を向上できる。According to the twelfth aspect of the present invention, since the subcooling circuit branches off from the downstream side of the main expansion valve, the supercooling circuit can increase the supercooling and improve the capacity. In addition, the communication capillary allows the gas refrigerant in the upper part of the receiver to be introduced downstream of the subcooling heat exchanger, so that liquid back to the compressor can be suppressed and reliability can be improved.

【図面の簡単な説明】[Brief description of the drawings]

【図１】 この発明の冷媒回路の第１実施形態を示す回
路図である。FIG. 1 is a circuit diagram showing a first embodiment of a refrigerant circuit of the present invention.

【図２】 図２(Ａ)はこの発明の第２実施形態を示す回
路図であり、図２(Ｂ)は第３実施形態を示す回路図であ
り、図２(Ｃ)は第４実施形態を示す回路図である。FIG. 2A is a circuit diagram showing a second embodiment of the present invention, FIG. 2B is a circuit diagram showing a third embodiment, and FIG. 2C is a circuit diagram showing a fourth embodiment. FIG. 3 is a circuit diagram showing an embodiment.

【図３】 図３(Ａ)はこの発明の第５実施形態を示す回
路図であり、図３(Ｂ)は第６実施形態を示す回路図であ
り、図３(Ｃ)は第７実施形態を示す回路図である。3 (A) is a circuit diagram showing a fifth embodiment of the present invention, FIG. 3 (B) is a circuit diagram showing a sixth embodiment, and FIG. 3 (C) is a seventh embodiment. FIG. 3 is a circuit diagram showing an embodiment.

【図４】 従来の冷媒回路を示す回路図である。FIG. 4 is a circuit diagram showing a conventional refrigerant circuit.

【符号の説明】[Explanation of symbols]

１…室内熱交換器、２…閉鎖弁、３…四路切換弁、５…
圧縮機、６…室外熱交換器、７…ブリッジ整流回路、８
…レシーバ、８Ａ…レシーバ上部、１０…主膨張弁、１
１…閉鎖弁、１５…過冷却熱交換器、１５Ａ…被冷却配
管、１５Ｂ…冷却配管、１７…接続配管、２０…連絡キ
ャピラリ、２１…感温筒式膨張弁、３０…過冷却回路、
４１…ブリッジ整流回路、４２…キャピラリ、４３…キ
ャピラリ、６１，７１…連絡キャピラリ。DESCRIPTION OF SYMBOLS 1 ... Indoor heat exchanger, 2 ... Closing valve, 3 ... Four-way switching valve, 5 ...
Compressor, 6 outdoor heat exchanger, 7 bridge rectifier circuit, 8
... Receiver, 8A ... Receiver upper part, 10 ... Main expansion valve, 1
DESCRIPTION OF SYMBOLS 1 ... Closure valve, 15 ... Supercooling heat exchanger, 15A ... Cooling piping, 15B ... Cooling piping, 17 ... Connection piping, 20 ... Communication capillary, 21 ... Temperature-sensitive cylinder type expansion valve, 30 ... Supercooling circuit,
41: Bridge rectifier circuit, 42: Capillary, 43: Capillary, 61, 71: Contact capillary.

Claims (12)

【特許請求の範囲】[Claims] 【請求項１】 室内熱交換器(１)，圧縮機(５)，室外熱
交換器(６)，レシーバ(８)，主膨張弁(１０)を接続する
冷媒回路であって、 上記レシーバ(８)の上部(８Ａ)と上記主膨張弁(１０)の
下流側とを連結するキャピラリ(２０)を備えたことを特
徴とする冷媒回路。A refrigerant circuit for connecting an indoor heat exchanger (1), a compressor (5), an outdoor heat exchanger (6), a receiver (8), and a main expansion valve (10), wherein the receiver ( 8) A refrigerant circuit comprising a capillary (20) for connecting an upper portion (8A) of 8) and a downstream side of the main expansion valve (10). 【請求項２】 室内熱交換器(１)，圧縮機(５)，室外熱
交換器(６)，レシーバ(８)，主膨張弁(１０)を接続する
冷媒回路であって、 上記レシーバ(８)から上記主膨張弁(１０)に流れる冷媒
を冷やす過冷却熱交換器とこの過冷却熱交換器(１５)の
上流側に接続された過冷却膨張弁とを有した過冷却回路
(３０)が、上記主膨張弁(１０)の下流側から分岐して上
記圧縮機(５)の吸入側に接続されていることを特徴とす
る冷媒回路。2. A refrigerant circuit for connecting an indoor heat exchanger (1), a compressor (5), an outdoor heat exchanger (6), a receiver (8), and a main expansion valve (10). A supercooling circuit having a supercooling heat exchanger for cooling the refrigerant flowing from 8) to the main expansion valve (10) and a supercooling expansion valve connected upstream of the supercooling heat exchanger (15).
(30) A refrigerant circuit, wherein the refrigerant circuit branches from a downstream side of the main expansion valve (10) and is connected to a suction side of the compressor (5). 【請求項３】 室内熱交換器(１)，圧縮機(５)，室外熱
交換器(６)，レシーバ(８)，主膨張弁(１０)を接続する
冷媒回路であって、 上記レシーバ(８)の上部(８Ａ)と上記主膨張弁(１０)の
下流側とを連結するキャピラリ(２０)を備え、 上記レシーバ(８)から上記主膨張弁(１０)に流れる冷媒
を冷やす過冷却熱交換器(１５)とこの過冷却熱交換器
(１５)の上流側に接続された過冷却膨張弁(２１)とを有
した過冷却回路(３０)が、上記主膨張弁(１０)の下流側
から分岐して上記圧縮機(５)の吸入側に接続されている
ことを特徴とする冷媒回路。3. A refrigerant circuit for connecting an indoor heat exchanger (1), a compressor (5), an outdoor heat exchanger (6), a receiver (8), and a main expansion valve (10). 8) a capillary (20) connecting the upper part (8A) of the main expansion valve (10) and the downstream side of the main expansion valve (10), and supercooling heat for cooling the refrigerant flowing from the receiver (8) to the main expansion valve (10). Exchanger (15) and this subcooling heat exchanger
A supercooling circuit (30) having a supercooling expansion valve (21) connected to the upstream side of (15) branches off from the downstream side of the main expansion valve (10) and is connected to the compressor (5). A refrigerant circuit connected to the suction side. 【請求項４】 請求項１乃至３のいずれか１つに記載の
冷媒回路において、上記圧縮機(５)の吐出側を室外熱交
換器(６)に接続し、上記圧縮機(５)の吸入側を室内熱交
換器(１)に接続する冷房位置と、上記圧縮機(５)の吐出
側を室内熱交換器(１)に接続し、上記圧縮機(５)の吸入
側を室外熱交換器(６)に接続する暖房位置とに切り替え
られる四路切換弁(３)と、 上記室内熱交換器(１)からの冷媒を上記レシーバ(８)に
導き、上記レシーバ(８)，主膨張弁(１０)を経由した冷
媒を上記室外熱交換器(６)に導く一方、上記室外熱交換
器(６)からの冷媒を上記レシーバ(８)に導き、上記レシ
ーバ(８)，主膨張弁(１０)を経由した冷媒を上記室内熱
交換器(１)に導く整流回路(７，４１)とを備えたことを
特徴とする冷媒回路。4. The refrigerant circuit according to claim 1, wherein a discharge side of the compressor (5) is connected to an outdoor heat exchanger (6). The cooling position where the suction side is connected to the indoor heat exchanger (1), the discharge side of the compressor (5) is connected to the indoor heat exchanger (1), and the suction side of the compressor (5) is the outdoor heat A four-way switching valve (3) that is switched to a heating position connected to an exchanger (6); and a refrigerant from the indoor heat exchanger (1) that is guided to the receiver (8). The refrigerant that has passed through the expansion valve (10) is guided to the outdoor heat exchanger (6), while the refrigerant from the outdoor heat exchanger (6) is guided to the receiver (8). A rectifier circuit (7, 41) for guiding the refrigerant via the valve (10) to the indoor heat exchanger (1). 【請求項５】 請求項１乃至４のいずれか１つに記載の
冷媒回路において、上記過冷却膨張弁(２１)は、上記過
冷却熱交換器(１５)の出口での過冷却回路(３０)の温度
に応じて開度が変化する感温筒式膨張弁(２１)であるこ
とを特徴とする冷媒回路。5. The refrigerant circuit according to claim 1, wherein the subcooling expansion valve (21) is connected to a subcooling circuit (30) at an outlet of the subcooling heat exchanger (15). A refrigerant circuit characterized in that it is a temperature-sensitive cylinder type expansion valve (21) whose degree of opening changes according to the temperature of (1). 【請求項６】 室内熱交換器(１)，圧縮機(５)，室外熱
交換器(６)，レシーバ(８)，主膨張弁(１０)を接続する
冷媒回路であって、 上記圧縮機(５)の吐出側を室外熱交換器(６)に接続し、
上記圧縮機(５)の吸入側を室内熱交換器(１)に接続する
冷房位置と、上記圧縮機(５)の吐出側を室内熱交換器
(１)に接続し、上記圧縮機(５)の吸入側を室外熱交換器
(６)に接続する暖房位置とに切り替えられる四路切換弁
(３)と、 上記室内熱交換器(１)に第２端(４１Ｂ)が接続され、上
記レシーバ(８)上部(８Ａ)の所定箇所(８Ａ−１)に第３
端(４１Ｃ)が接続され、上記レシーバ(８)上部(８Ａ)の
別の箇所(８Ａ−２)に第４端(４１Ｄ)が接続され、上記
室外熱交換器(６)に第５端(４１Ｅ)が接続され、上記主
膨張弁(１０)に第１端(４１Ａ)が接続されており、上記
第２端(４１Ｂ)と第３端(４１Ｃ)との間に接続されたキ
ャピラリ(４２)と、上記第４端(４１Ｄ)と第５端(４１
Ｅ)との間に接続されたキャピラリ(４３)と、上記第５
端(４１Ｅ)と第１端(４１Ａ)との間に上記第１端(４１
Ａ)から上記第５端(４１Ｅ)に向かって順方向に接続さ
れた逆止弁(２５)と、上記第１端(４１Ａ)と上記第２端
(４１Ｂ)との間に上記第１端(４１Ａ)から第２端(４１
Ｂ)に向かって順方向に接続された逆止弁(２８)とを有
する整流回路(４１)と、 上記主膨張弁(１０)の下流側から分岐して上記圧縮機
(５)の吸入側に接続されていて、上記レシーバ(８)から
上記主膨張弁(１０)に流れる冷媒を冷やす過冷却熱交換
器(１５)とこの過冷却熱交換器(１５)の下流側に接続さ
れた過冷却膨張弁(２１)とを有した過冷却回路(３０)と
を備えたことを特徴とする冷媒回路。6. A refrigerant circuit for connecting an indoor heat exchanger (1), a compressor (5), an outdoor heat exchanger (6), a receiver (8), and a main expansion valve (10). Connect the discharge side of (5) to the outdoor heat exchanger (6),
A cooling position at which the suction side of the compressor (5) is connected to the indoor heat exchanger (1), and an indoor heat exchanger at the discharge side of the compressor (5).
(1) Connect the suction side of the compressor (5) to an outdoor heat exchanger
Four-way switching valve that can be switched to the heating position connected to (6)
(3), a second end (41B) is connected to the indoor heat exchanger (1), and a third end (8A-1) is provided at a predetermined location (8A-1) on the upper portion (8A) of the receiver (8).
The end (41C) is connected, the fourth end (41D) is connected to another portion (8A-2) of the upper portion (8A) of the receiver (8), and the fifth end (41) is connected to the outdoor heat exchanger (6). 41E), a first end (41A) is connected to the main expansion valve (10), and a capillary (42) connected between the second end (41B) and the third end (41C). ), The fourth end (41D) and the fifth end (41
E) and a capillary (43) connected between
Between the end (41E) and the first end (41A).
A) a check valve (25) connected in a forward direction from the fifth end (41E) to the fifth end (41E), the first end (41A) and the second end
(41B) between the first end (41A) and the second end (41
A rectifier circuit (41) having a check valve (28) connected in the forward direction toward B), and a compressor branched from a downstream side of the main expansion valve (10).
A supercooling heat exchanger (15) connected to the suction side of (5) for cooling the refrigerant flowing from the receiver (8) to the main expansion valve (10), and a downstream side of the supercooling heat exchanger (15) And a supercooling circuit (30) having a supercooling expansion valve (21) connected to the refrigerant circuit. 【請求項７】 室内熱交換器(１)，圧縮機(５)，室外熱
交換器(６)，レシーバ(８)，主膨張弁(１０)を接続する
冷媒回路であって、 上記圧縮機(５)の吐出側を室外熱交換器(６)に接続し、
上記圧縮機(５)の吸入側を室内熱交換器(１)に接続する
冷房位置と、上記圧縮機(５)の吐出側を室内熱交換器
(１)に接続し、上記圧縮機(５)の吸入側を室外熱交換器
(６)に接続する暖房位置とに切り替えられる四路切換弁
(３)と、 上記室内熱交換器(１)に第２端(４１Ｂ)が接続され、上
記レシーバ(８)上部(８Ａ)の所定箇所(８Ａ−１)に第３
端(４１Ｃ)が接続され、上記レシーバ(８)上部(８Ａ)の
別の箇所(８Ａ−２)に第４端(４１Ｄ)が接続され、上記
室外熱交換器(６)に第５端(４１Ｅ)が接続され、上記主
膨張弁(１０)に第１端(４１Ａ)が接続されており、上記
第２端(４１Ｂ)と第３端(４１Ｃ)との間に接続されたキ
ャピラリ(４２)と、上記第４端(４１Ｄ)と第５端(４１
Ｅ)との間に接続されたキャピラリ(４３)と、上記第５
端(４１Ｅ)と第１端(４１Ａ)との間に上記第１端(４１
Ａ)から上記第５端(４１Ｅ)に向かって順方向に接続さ
れた逆止弁(２８)と、上記第１端(４１Ａ)と上記第２端
(４１Ｂ)との間に上記第１端(４１Ａ)から第２端(４１
Ｂ)に向かって順方向に接続された逆止弁(２５)とを有
する整流回路(４１)と、 上記主膨張弁(１０)の上流側から分岐して上記圧縮機
(５)の吸入側に接続されていて、上記レシーバ(８)から
上記主膨張弁(１０)に流れる冷媒を冷やす過冷却熱交換
器(１５)とこの過冷却熱交換器(１５)の上流側に接続さ
れた過冷却膨張弁(２１)とを有した過冷却回路(３０)と
を備えたことを特徴とする冷媒回路。7. A refrigerant circuit for connecting an indoor heat exchanger (1), a compressor (5), an outdoor heat exchanger (6), a receiver (8), and a main expansion valve (10). Connect the discharge side of (5) to the outdoor heat exchanger (6),
A cooling position at which the suction side of the compressor (5) is connected to the indoor heat exchanger (1), and an indoor heat exchanger at the discharge side of the compressor (5).
(1) Connect the suction side of the compressor (5) to an outdoor heat exchanger
Four-way switching valve that can be switched to the heating position connected to (6)
(3), a second end (41B) is connected to the indoor heat exchanger (1), and a third end (8A-1) is provided at a predetermined location (8A-1) on the upper portion (8A) of the receiver (8).
The end (41C) is connected, the fourth end (41D) is connected to another portion (8A-2) of the upper portion (8A) of the receiver (8), and the fifth end (41) is connected to the outdoor heat exchanger (6). 41E), a first end (41A) is connected to the main expansion valve (10), and a capillary (42) connected between the second end (41B) and the third end (41C). ), The fourth end (41D) and the fifth end (41
E) and a capillary (43) connected between
Between the end (41E) and the first end (41A).
A) a check valve (28) connected in the forward direction from the fifth end (41E) to the first end (41A) and the second end.
(41B) between the first end (41A) and the second end (41
A rectifier circuit (41) having a check valve (25) connected in the forward direction toward B), and a compressor branched from an upstream side of the main expansion valve (10).
A supercooling heat exchanger (15) connected to the suction side of (5) for cooling the refrigerant flowing from the receiver (8) to the main expansion valve (10), and an upstream of the supercooling heat exchanger (15) And a supercooling circuit (30) having a supercooling expansion valve (21) connected to the refrigerant circuit. 【請求項８】 請求項６または７に記載の冷媒回路にお
いて、 上記レシーバ(８)上部(８Ａ)と上記過冷却熱交換器(１
５)の下流側とを連絡する連絡キャピラリ(５１)を備え
たことを特徴とする冷媒回路。8. The refrigerant circuit according to claim 6, wherein an upper portion (8A) of the receiver (8) and the subcooling heat exchanger (1) are provided.
5) A refrigerant circuit comprising a communication capillary (51) for communicating with the downstream side of (5). 【請求項９】 室内熱交換器(１)，圧縮機(５)，室外熱
交換器(６)，レシーバ(８)，主膨張弁(１０)を接続する
冷媒回路であって、 上記レシーバ(８)の上部(８Ａ)と上記主膨張弁(１０)の
下流側とを連結するキャピラリ(２０)を備え、 上記レシーバ(８)から上記主膨張弁(１０)に流れる冷媒
を冷やす過冷却熱交換器(１５)とこの過冷却熱交換器
(１５)の上流側に接続された過冷却膨張弁(２１)とを有
した過冷却回路(３０)が、上記主膨張弁(１０)の上流側
から分岐して上記圧縮機(５)の吸入側に接続されている
ことを特徴とする冷媒回路。9. A refrigerant circuit for connecting an indoor heat exchanger (1), a compressor (5), an outdoor heat exchanger (6), a receiver (8), and a main expansion valve (10). 8) a capillary (20) connecting the upper part (8A) of the main expansion valve (10) and the downstream side of the main expansion valve (10), and supercooling heat for cooling the refrigerant flowing from the receiver (8) to the main expansion valve (10). Exchanger (15) and this subcooling heat exchanger
A supercooling circuit (30) having a supercooling expansion valve (21) connected to the upstream side of (15) branches off from the upstream side of the main expansion valve (10) and is connected to the compressor (5). A refrigerant circuit connected to the suction side. 【請求項１０】 室内熱交換器(１)，圧縮機(５)，室外
熱交換器(６)，レシーバ(８)，主膨張弁(１０)を接続す
る冷媒回路であって、 上記レシーバ(８)から上記主膨張弁(１０)に流れる冷媒
を冷やす過冷却熱交換器(１５)とこの過冷却熱交換器
(１５)の上流側に接続された過冷却膨張弁(２１)とを有
した過冷却回路(３０)が、上記主膨張弁(１０)の上流側
から分岐して上記圧縮機(５)の吸入側に接続されてい
て、 上記レシーバ(８)の上部(８Ａ)を、上記過冷却膨張弁
(２１)と上記過冷却熱交換器(１５)との間に連結する連
絡キャピラリ(６１)とを備えたことを特徴とする冷媒回
路。10. A refrigerant circuit for connecting an indoor heat exchanger (1), a compressor (5), an outdoor heat exchanger (6), a receiver (8), and a main expansion valve (10). 8) a subcooling heat exchanger (15) for cooling the refrigerant flowing from the main expansion valve (10) to the main expansion valve (10);
A supercooling circuit (30) having a supercooling expansion valve (21) connected to the upstream side of (15) branches off from the upstream side of the main expansion valve (10) and is connected to the compressor (5). The upper part (8A) of the receiver (8) connected to the suction side is connected to the supercooling expansion valve.
A refrigerant circuit comprising a communication capillary (61) connected between the supercooling heat exchanger (15) and the supercooling heat exchanger (15). 【請求項１１】 室内熱交換器(１)，圧縮機(５)，室外
熱交換器(６)，レシーバ(８)，主膨張弁(１０)を接続す
る冷媒回路であって、 上記レシーバ(８)から上記主膨張弁(１０)に流れる冷媒
を冷やす過冷却熱交換器(１５)とこの過冷却熱交換器
(１５)の上流側に接続された過冷却膨張弁(２１)とを有
した過冷却回路(３０)が、上記主膨張弁(１０)の下流側
から分岐して上記圧縮機(５)の吸入側に接続されてい
て、 上記レシーバ(８)の上部(８Ａ)を、上記過冷却膨張弁
(２１)と上記過冷却熱交換器(１５)との間に連結する連
絡キャピラリ(６１)とを備えたことを特徴とする冷媒回
路。11. A refrigerant circuit for connecting an indoor heat exchanger (1), a compressor (5), an outdoor heat exchanger (6), a receiver (8), and a main expansion valve (10). 8) a subcooling heat exchanger (15) for cooling the refrigerant flowing from the main expansion valve (10) to the main expansion valve (10);
A supercooling circuit (30) having a supercooling expansion valve (21) connected to the upstream side of (15) branches off from the downstream side of the main expansion valve (10) and is connected to the compressor (5). The upper part (8A) of the receiver (8) connected to the suction side is connected to the supercooling expansion valve.
A refrigerant circuit comprising a communication capillary (61) connected between the supercooling heat exchanger (15) and the supercooling heat exchanger (15). 【請求項１２】 室内熱交換器(１)，圧縮機(５)，室外
熱交換器(６)，レシーバ(８)，主膨張弁(１０)を接続す
る冷媒回路であって、 上記レシーバ(８)から上記主膨張弁(１０)に流れる冷媒
を冷やす過冷却熱交換器(１５)とこの過冷却熱交換器
(１５)の上流側に接続された過冷却膨張弁(２１)とを有
した過冷却回路(３０)が、上記主膨張弁(１０)の下流側
から分岐して上記圧縮機(５)の吸入側に接続されてい
て、 上記レシーバ(８)の上部(８Ａ)を、上記過冷却熱交換器
(１５)の下流側に連結する連絡キャピラリ(５１)を備え
たことを特徴とする冷媒回路。12. A refrigerant circuit for connecting an indoor heat exchanger (1), a compressor (5), an outdoor heat exchanger (6), a receiver (8), and a main expansion valve (10). 8) a subcooling heat exchanger (15) for cooling the refrigerant flowing from the main expansion valve (10) to the main expansion valve (10);
A supercooling circuit (30) having a supercooling expansion valve (21) connected to the upstream side of (15) branches off from the downstream side of the main expansion valve (10) and is connected to the compressor (5). The upper part (8A) of the receiver (8) connected to the suction side is connected to the subcooling heat exchanger.
A refrigerant circuit comprising a communication capillary (51) connected downstream of (15).
JP28840397A 1997-10-21 1997-10-21 Refrigerant circuit Expired - Fee Related JP4035871B2 (en)

Priority Applications (1)

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