JPH074754A - Refrigerating device - Google Patents
Refrigerating deviceInfo
- Publication number
- JPH074754A JPH074754A JP14629893A JP14629893A JPH074754A JP H074754 A JPH074754 A JP H074754A JP 14629893 A JP14629893 A JP 14629893A JP 14629893 A JP14629893 A JP 14629893A JP H074754 A JPH074754 A JP H074754A
- Authority
- JP
- Japan
- Prior art keywords
- injection
- refrigerant
- compressor
- pipe
- liquid
- 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.)
- Pending
Links
Landscapes
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】リキッドインジェクション方式で
圧縮機を冷却する冷凍装置の信頼性向上技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving the reliability of a refrigeration system that cools a compressor by a liquid injection method.
【0002】[0002]
【従来の技術】リキッドインジェクション方式で圧縮機
を冷却する冷凍装置に於て、冷媒リーク等により冷媒チ
ャージ量が不足すると凝縮冷媒の過冷却が取れなくな
り、フラッシュガスが発生する。2. Description of the Related Art In a refrigerating apparatus for cooling a compressor by a liquid injection method, if the refrigerant charge amount is insufficient due to a refrigerant leak or the like, the condensed refrigerant cannot be overcooled and flash gas is generated.
【0003】このフラッシュガスはリキッドインジェク
ション管にも入り込み、通過抵抗が増えるのでインジェ
クション量の制御手段を通過する冷媒は急激に減少す
る。This flash gas also enters the liquid injection pipe to increase the passage resistance, so that the amount of the refrigerant passing through the injection amount control means sharply decreases.
【0004】インジェクション量が不足すると圧縮機の
冷却効果がなくなり、吐出ガス温度の過熱等により保護
装置が作動することがあり、装置の安定運転が出来なく
なる。さらにインジェクション量不足が進むと保護装置
の作動前に圧縮機にカジリ・ロック等の重大なダメージ
を与えることが起こる。If the injection amount is insufficient, the cooling effect of the compressor is lost, and the protective device may operate due to overheating of the discharge gas temperature and the like, and stable operation of the device cannot be performed. Further, if the injection amount becomes insufficient, serious damage such as galling and lock may occur on the compressor before the protective device is activated.
【0005】従来はこういう事態を避けるために実開平
2−52060号公報等に示される方法を用いてインジ
ェクション管に容易にフラッシュガスが入り込まない様
に工夫していた。Conventionally, in order to avoid such a situation, the method disclosed in Japanese Utility Model Laid-Open No. 52060/1990 has been devised so that the flash gas does not easily enter the injection pipe.
【0006】[0006]
【発明が解決しようとする課題】従来のこの方法では冷
媒チャージ量が不足するとインジェクション管にフラッ
シュガスが発生するよりも前に冷却負荷側に供給される
冷媒が不足し、装置自体の冷却不良・低圧スイッチの作
動が起こり、使用者に冷媒チャージ量不足を知らさし
め、しかるべき処置を取らせる様にして圧縮機のカジリ
・ロック等の重大なダメージの発生を防止していた。In this conventional method, if the charge amount of the refrigerant is insufficient, the refrigerant supplied to the cooling load side is insufficient before the flash gas is generated in the injection pipe, resulting in poor cooling of the apparatus itself. The operation of the low pressure switch occurred, and the user was informed of the shortage of the charge amount of the refrigerant, and appropriate measures were taken to prevent serious damage such as scoring and locking of the compressor.
【0007】しかし、この方法でフラッシュガスを分離
しインジェクション管に冷媒の液分のみを供給してもそ
の冷媒には過冷却がほとんどないため、インジェクショ
ン管の配管抵抗あるいはヘッド差・圧縮機周辺の高温に
よりフラッシュガスが再び発生することがあり圧縮機保
護に対して十分でなかった。However, even if the flash gas is separated by this method and only the liquid component of the refrigerant is supplied to the injection pipe, there is almost no subcooling in the refrigerant. Therefore, the piping resistance of the injection pipe or the head difference Flash gas could be regenerated at high temperatures and was not sufficient for compressor protection.
【0008】また、過冷却を確実に得るために受液器か
ら取り出された冷媒を再度空冷式凝縮器に戻し過冷却す
る方法も考えられたが、この場合空冷式凝縮器の一部を
使って過冷却を取っているため過冷却を取らない場合と
同等の凝縮温度設計とするためには凝縮器のサイズアッ
プが必要になる。Further, a method of returning the refrigerant taken out from the liquid receiver to the air-cooled condenser and supercooling again in order to surely obtain the supercooling has been considered, but in this case, a part of the air-cooled condenser is used. Therefore, the size of the condenser must be increased in order to achieve a condensing temperature design equivalent to the case where supercooling is not performed.
【0009】凝縮器のサイズアップができない場合には
凝縮器の有効伝熱面積が小さくなり高外気温度時に高圧
保護装置が作動することがある。さらに、過冷却を得る
ために追加された空冷式凝縮器に出入する配管はその中
を全冷媒循環量が通過するので冷却負荷につながる液管
と同等以上の配管径が必要になり、配管設計を複雑にし
てしまう欠点があった。If the size of the condenser cannot be increased, the effective heat transfer area of the condenser becomes small and the high pressure protection device may operate at high outside air temperature. In addition, the piping that goes in and out of the air-cooled condenser that has been added to obtain supercooling passes through the entire amount of refrigerant circulation, so a piping diameter equal to or larger than that of the liquid pipe that leads to the cooling load is required. Had the drawback of complicating.
【0010】このような問題点に対して、本発明はリキ
ッドインジェクション方式で圧縮機を冷却する冷凍装置
に於て、冷媒リーク等により冷媒チャージ量が不足した
場合でも確実に圧縮機を保護出来る冷凍装置を提供する
ものである。In order to solve such a problem, the present invention relates to a liquid injection type refrigerating apparatus for cooling a compressor, which can reliably protect the compressor even when the refrigerant charge amount is insufficient due to a refrigerant leak or the like. A device is provided.
【0011】[0011]
【課題を解決するための手段】本発明は圧縮機、空冷式
凝縮器、受液器、減圧装置、蒸発器を冷媒管で順次つな
いで冷凍サイクルを構成し、この冷凍サイクル中の冷媒
液を圧縮機へインジェクションするリキッドインジェク
ション管と、このインジェクション管の途中にインジェ
クション量を制御する手段を備えた冷凍装置において、
受液器あるいは受液器出口の冷媒管より取り出された冷
媒液を上記空冷式凝縮器で過冷却させた後、流量制御手
段を経て圧縮機にインジェクションするものである。According to the present invention, a refrigeration cycle is constructed by sequentially connecting a compressor, an air-cooled condenser, a liquid receiver, a decompression device, and an evaporator with a refrigerant pipe. In a liquid injection pipe for injecting into a compressor, and a refrigeration system equipped with a means for controlling the injection amount in the middle of this injection pipe,
The refrigerant liquid taken out from the liquid receiver or the refrigerant pipe at the outlet of the liquid receiver is supercooled by the air-cooled condenser and then injected into the compressor through the flow rate control means.
【0012】[0012]
【作用】本発明の冷凍装置は、圧縮機へのインジェクシ
ョン用の冷媒が空冷式凝縮器により確実に過冷却される
ので、使用者が装置冷却不良・低圧スイッチの作動等に
より冷媒チャージ量不足を知るまでの間圧縮機を確実に
冷却することができる。In the refrigerating apparatus of the present invention, the refrigerant for injection into the compressor is surely supercooled by the air-cooled condenser, so that the user is prevented from insufficient charging of the refrigerant due to insufficient cooling of the apparatus or operation of the low pressure switch. The compressor can be cooled surely until it is known.
【0013】また、過冷却されるのはインジェクション
用冷媒のみなので凝縮器サイズアップはほとんどなく、
その過冷却用の配管径もインジェクション量に見合った
小さいものでよく配管設計を容易にすることができる。Also, since only the injection refrigerant is supercooled, there is almost no increase in the size of the condenser,
The diameter of the pipe for supercooling is also small in proportion to the injection amount, and the pipe design can be facilitated.
【0014】[0014]
【実施例】以下本発明の実施例を図面に基づいて説明す
る。図1において冷凍サイクルは気液分離器1を経てス
クロール型圧縮機2に吸入された低圧冷媒ガスが、この
圧縮機2で圧縮されて高温高圧のガスになり吐出され
る。高温高圧のガスは空冷凝縮器3で冷却されほとんど
が液化し、受液器4に入る。受液器4で一部のガス分を
分離され完全な液となった冷媒は、閉鎖弁5・フィルタ
ドライヤ6・サイトグラス7を通過して膨張弁8(減圧
装置)で減圧された後、蒸発器9で気化し、周囲を冷や
して冷却作用を行う。Embodiments of the present invention will be described below with reference to the drawings. In the refrigeration cycle in FIG. 1, the low-pressure refrigerant gas sucked into the scroll compressor 2 through the gas-liquid separator 1 is compressed by the compressor 2 into high-temperature and high-pressure gas and discharged. Most of the high-temperature and high-pressure gas is cooled by the air-cooled condenser 3 and liquefied, and enters the liquid receiver 4. The refrigerant, which has become a complete liquid by separating a part of the gas in the receiver 4, passes through the closing valve 5, the filter dryer 6, and the sight glass 7, and is decompressed by the expansion valve 8 (pressure reducing device). It vaporizes in the evaporator 9 and cools the surroundings to perform a cooling action.
【0015】リキッドインジェクション用冷媒は、受液
器4、閉鎖弁5の間の配管111より分岐したインジェ
クション管101により空冷式凝縮器3の一部に形成さ
れた過冷却器301に導かれこの空冷凝縮器3で過冷却
された後、インジェクション管102、サービス用閉鎖
弁11、電磁弁12、インジェクション制御弁13を順
に通りスクロール型圧縮機2の中間圧インジェクション
ポート201に入り、その蒸発潜熱により圧縮要素を冷
却する。The liquid injection refrigerant is guided to a subcooler 301 formed in a part of the air-cooled condenser 3 by an injection pipe 101 branched from a pipe 111 between the liquid receiver 4 and the closing valve 5, and this air cooling is performed. After being supercooled by the condenser 3, it enters the intermediate pressure injection port 201 of the scroll type compressor 2 through the injection pipe 102, the service closing valve 11, the solenoid valve 12, and the injection control valve 13 in order, and is compressed by the latent heat of vaporization. Cool the element.
【0016】インジェクション管102に入る冷媒は過
冷却が十分になさせているので、インジェクション管の
配管抵抗或はヘッド差・圧縮機周辺の高温によりフラッ
シュガスが発生することはなくインジェクション制御弁
13により常に適正なインジェクション量が圧縮機2の
インジェクションポート201に供給される。Since the refrigerant entering the injection pipe 102 is sufficiently supercooled, the flash gas is not generated due to the piping resistance of the injection pipe, the head difference, and the high temperature around the compressor, and the injection control valve 13 is used. A proper injection amount is always supplied to the injection port 201 of the compressor 2.
【0017】また、冷媒リーク・試運転時冷媒封入不足
等により受液器4出口にフラッシュガスが発生した場合
でも過冷却器301でインジェクション用冷媒の熱交換
が行われるためインジェクション制御弁13の入口では
フラッシュガスの発生はなく適正なインジェクション量
の制御が行われる。このとき、冷却負荷側に供給される
冷媒は少なくなり装置冷却不良・低圧スイッチの作動等
により使用者に冷媒不足に気付かせることができる。Further, even if flash gas is generated at the outlet of the receiver 4 due to refrigerant leakage or insufficient refrigerant filling during trial operation, heat exchange of the injection refrigerant is performed in the subcooler 301, so that at the inlet of the injection control valve 13. There is no generation of flash gas, and an appropriate injection amount control is performed. At this time, the amount of the refrigerant supplied to the cooling load side becomes small, so that the user can be made aware of the insufficient refrigerant due to defective cooling of the device, operation of the low pressure switch, or the like.
【0018】さらに過冷却器301で得られる過冷却の
値を大きく設計すれば、万が一使用者の冷媒不足認知が
遅れても圧縮機の保護出来る可能性は高くなる。Further, if the value of the supercooling obtained by the supercooler 301 is designed to be large, the possibility of protecting the compressor becomes high even if the user's recognition of the lack of refrigerant is delayed.
【0019】また、インジェクション用に循環する冷媒
を過冷却するのに必要な熱量は凝縮器で排熱される熱量
の数パーセント以下に過ぎず過冷却を取ったための凝縮
器サイズアップはほとんどの場合必要ない。さらに、イ
ンジェクション管101・102は配管401の半分程
度の内径を持てば十分で配管設計は比較的容易である。Further, the amount of heat required for supercooling the refrigerant circulating for injection is only a few percent or less of the amount of heat exhausted by the condenser, and in most cases, the size of the condenser needs to be increased due to supercooling. Absent. Further, the injection pipes 101 and 102 need only have an inner diameter of about half of the pipe 401, and the pipe design is relatively easy.
【0020】尚20は装置保護用高低圧圧力スイッチで
ある。Numeral 20 is a high / low pressure switch for device protection.
【0021】図2は本発明の他の実施例を示す冷媒回路
図であり、インジェクション用冷媒を先端が冷却負荷に
つながる冷媒取出配管111の先端よりも下方に位置す
るインジェクション冷媒取出管401から取り出した
点、図1に示した冷媒回路図と異なる。尚、図1と同じ
構成要素は同じ符番を付し説明は省略する。FIG. 2 is a refrigerant circuit diagram showing another embodiment of the present invention, in which the injection refrigerant is taken out from an injection refrigerant take-out pipe 401 located below the tip of a refrigerant take-out pipe 111 whose tip is connected to a cooling load. 1 is different from the refrigerant circuit diagram shown in FIG. The same components as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.
【0022】[0022]
【発明の効果】以上のように構成された本発明の冷凍装
置を用いることによって、インジェクション用冷媒のみ
を過冷却することができ(1)冷媒不足時にでも圧縮機を
確実に冷却することができ圧縮機をカジリ・ロック等の
重大なダメージから保護できる。(2)冷媒過冷却のため
の配管径が小さく出来るので配管設計が容易になる。
(3)過冷却を大きめに設定することが容易でインジェク
ション回路に含まれる電磁弁、閉鎖弁等は圧力損失が多
少あっても問題なく、サイズの小さい安価な電磁弁・閉
鎖弁等を選定できる。By using the refrigerating apparatus of the present invention configured as described above, it is possible to supercool only the refrigerant for injection (1) It is possible to reliably cool the compressor even when the refrigerant is insufficient. Protects the compressor from serious damage such as staking and locking. (2) Since the diameter of the pipe for supercooling the refrigerant can be made small, the pipe design becomes easy.
(3) It is easy to set a large amount of supercooling, and there is no problem even if there is some pressure loss for the solenoid valve, closing valve, etc. included in the injection circuit, and you can select a small size inexpensive solenoid valve / closing valve etc. .
【図1】本発明の実施例を示す冷媒回路図である。FIG. 1 is a refrigerant circuit diagram showing an embodiment of the present invention.
【図2】本発明の他の実施例を示す冷媒回路図である。FIG. 2 is a refrigerant circuit diagram showing another embodiment of the present invention.
1 気液分離器 2 圧縮機 3 空冷凝縮器 4 受液器 8 膨張弁 9 蒸発器 111 配管 101 インジェクション管 102 インジェクション管 1 Gas-Liquid Separator 2 Compressor 3 Air-cooled Condenser 4 Liquid Receiver 8 Expansion Valve 9 Evaporator 111 Piping 101 Injection Pipe 102 Injection Pipe
Claims (1)
置、蒸発器を冷媒管で順次つないで冷凍サイクルを構成
し、この冷凍サイクル中の冷媒液を圧縮機へインジェク
ションするリキッドインジェクション管と、このインジ
ェクション管の途中にインジェクション量を制御する手
段を備えた冷凍装置において、受液器あるいは受液器出
口の冷媒管より取り出された冷媒液を上記空冷式凝縮器
で過冷却させた後、流量制御手段を経て圧縮機にインジ
ェクションすることを特徴とする冷凍装置。1. A liquid injection in which a compressor, an air-cooled condenser, a liquid receiver, a decompression device, and an evaporator are sequentially connected by a refrigerant pipe to form a refrigeration cycle, and the refrigerant liquid in the refrigeration cycle is injected into the compressor. In a refrigerating device equipped with a pipe and a means for controlling the injection amount in the middle of this injection pipe, the refrigerant liquid taken out from the refrigerant pipe at the receiver or the receiver outlet was supercooled by the air-cooled condenser. After that, the refrigerating apparatus is characterized in that it is injected into a compressor through a flow rate control means.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14629893A JPH074754A (en) | 1993-06-17 | 1993-06-17 | Refrigerating device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14629893A JPH074754A (en) | 1993-06-17 | 1993-06-17 | Refrigerating device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH074754A true JPH074754A (en) | 1995-01-10 |
Family
ID=15404519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14629893A Pending JPH074754A (en) | 1993-06-17 | 1993-06-17 | Refrigerating device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH074754A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004116995A (en) * | 2004-01-26 | 2004-04-15 | Hitachi Ltd | Refrigerating unit |
WO2014129472A1 (en) * | 2013-02-19 | 2014-08-28 | 三菱電機株式会社 | Air conditioning device |
WO2014129473A1 (en) * | 2013-02-19 | 2014-08-28 | 三菱電機株式会社 | Air conditioning device |
-
1993
- 1993-06-17 JP JP14629893A patent/JPH074754A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004116995A (en) * | 2004-01-26 | 2004-04-15 | Hitachi Ltd | Refrigerating unit |
WO2014129472A1 (en) * | 2013-02-19 | 2014-08-28 | 三菱電機株式会社 | Air conditioning device |
WO2014129473A1 (en) * | 2013-02-19 | 2014-08-28 | 三菱電機株式会社 | Air conditioning device |
CN104995463A (en) * | 2013-02-19 | 2015-10-21 | 三菱电机株式会社 | Air conditioning device |
JP5992089B2 (en) * | 2013-02-19 | 2016-09-14 | 三菱電機株式会社 | Air conditioner |
JP5992088B2 (en) * | 2013-02-19 | 2016-09-14 | 三菱電機株式会社 | Air conditioner |
US9857088B2 (en) | 2013-02-19 | 2018-01-02 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
US10107533B2 (en) | 2013-02-19 | 2018-10-23 | Mitsubishi Electric Corporation | Air-conditioning apparatus with subcooling heat exchanger |
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