JPH05187723A - Refrigerating plant - Google Patents
Refrigerating plantInfo
- Publication number
- JPH05187723A JPH05187723A JP88892A JP88892A JPH05187723A JP H05187723 A JPH05187723 A JP H05187723A JP 88892 A JP88892 A JP 88892A JP 88892 A JP88892 A JP 88892A JP H05187723 A JPH05187723 A JP H05187723A
- Authority
- JP
- Japan
- Prior art keywords
- liquid injection
- liquid
- circuit
- refrigerant
- condenser
- 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
- Rotary Pumps (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、冷凍サイクルの液イ
ンジェクション回路を有する冷凍装置に関し、特にイン
ジェクション部からインジェクション取出部への逆流防
止に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus having a liquid injection circuit of a refrigerating cycle, and more particularly to preventing backflow from an injection section to an injection take-out section.
【０００２】[0002]
【従来の技術】従来の冷凍装置を、図２を参考に説明す
る。１はスクロール圧縮機、２は凝縮器、３は絞り装置
（膨張弁）、４は蒸発器を示す。５は前記２の凝縮器を
通過した凝縮液化冷媒を、前記スクロール圧縮機１の圧
縮部の圧縮途中に液インジェクションする液インジェク
ション回路、６ａおよび６ｂは前記液インジェクション
回路の液流量を制御するキャピラリチューブ（毛細
管）、７ａおよび７ｂは液インジェクション回路の開閉
を、図示しない制御入力信号（例えば吐出温度サーモ）
によって行う液インジェクション電磁弁である。2. Description of the Related Art A conventional refrigeration system will be described with reference to FIG. 1 is a scroll compressor, 2 is a condenser, 3 is a throttle device (expansion valve), and 4 is an evaporator. Reference numeral 5 is a liquid injection circuit for injecting the condensed liquefied refrigerant that has passed through the condenser 2 during the compression of the compression section of the scroll compressor 1, and 6a and 6b are capillary tubes for controlling the liquid flow rate of the liquid injection circuit. (Capillary tube), 7a and 7b indicate opening and closing of the liquid injection circuit, and a control input signal (not shown) (for example, discharge temperature thermostat).
It is a liquid injection solenoid valve performed by.
【０００３】次に動作について説明する。液インジェク
ション回路は、吐出ガス温度の上昇を抑制する目的で、
凝縮器出口の凝縮液化冷媒を制御入力信号（ここでは図
示しない）によって液インジェクション電磁弁７ａ、７
ｂを開閉し、液インジェクション流量を所定の量に制限
する液インジェクションキャピラリを介してインジェク
ションするようになっている。例えばある所定のサーモ
設定の温度以上になると、液インジェクション電磁弁７
ａは「閉」となり、凝縮器２を通過した液冷媒の一部が
電磁弁７ｂ、液流量キャピラリ６ａを通り所定の流量が
流れ、被冷却を行うようになる。吐出ガス温度が前述の
インジェクション過程を続けサーモＯＦＦの設定値まで
下がると、電磁弁７ａは「開」・７ｂは「閉」となり凝
縮器２を通過した液冷媒の一部が電磁弁７ａ、液冷媒キ
ャピラリ６ａ、６ｂを通り所定の流量が流れ、被冷却を
行うようになる。このように運転中にサーモ信号等の入
力信号により吐出ガス温度の上昇を抑制しながら冷却を
行うようにしている。Next, the operation will be described. The liquid injection circuit is designed to suppress the rise in discharge gas temperature.
The liquid injection solenoid valves 7a, 7a for controlling the condensed liquefied refrigerant at the outlet of the condenser by a control input signal (not shown here).
b is opened and closed, and the liquid is injected through a liquid injection capillary that limits the liquid injection flow rate to a predetermined amount. For example, when the temperature rises above a predetermined thermo setting, the liquid injection solenoid valve 7
“A” is “closed”, and a part of the liquid refrigerant that has passed through the condenser 2 flows through the electromagnetic valve 7b and the liquid flow rate capillary 6a at a predetermined flow rate to be cooled. When the discharge gas temperature continues the above-mentioned injection process and falls to the set value of the thermo OFF, the solenoid valve 7a is "open" and 7b is "closed", and a part of the liquid refrigerant passing through the condenser 2 is discharged by the solenoid valve 7a and the liquid. A predetermined flow rate flows through the refrigerant capillaries 6a and 6b, and cooling is performed. In this way, during operation, cooling is performed while suppressing an increase in the discharge gas temperature by an input signal such as a thermo signal.
【０００４】[0004]
【発明が解決しようとする課題】従来の冷凍装置におけ
る液インジェクション回路は以上のように構成されてい
るので液インジェクション作動中に、運転条件により、
液インジェクション上流部（液冷媒取出口付近）の圧力
が液インジェクション下流部（被インジェクション部付
近）の圧力よりも低くなると逆流がおこり液冷媒部へガ
スが流入し、フラッシュガスとなり冷却運転上能力が低
下するなどの問題点があった。Since the liquid injection circuit in the conventional refrigerating apparatus is constructed as described above, during the liquid injection operation, depending on the operating conditions,
When the pressure in the upstream part of the liquid injection (near the liquid refrigerant outlet) becomes lower than the pressure in the downstream part of the liquid injection (near the injection target part), a backflow occurs and the gas flows into the liquid refrigerant part and becomes flash gas, which has a cooling operation capability. There was a problem such as a decrease.
【０００５】この発明は上記のような問題点を解消する
ためになされたもので、圧力条件の変化に伴う圧縮冷媒
ガスの被インジェクション部から液インジェクション回
路への逆流を防止して、適切な液インジェクションを実
現することを目的とする。The present invention has been made in order to solve the above problems, and prevents the backflow of the compressed refrigerant gas from the injection target portion to the liquid injection circuit due to the change of the pressure condition, thereby making it possible to obtain an appropriate liquid. The purpose is to realize injection.
【０００６】[0006]
【課題を解決するための手段】この発明に係る冷凍装置
は、液インジェクション回路の下流部、すなわち液イン
ジェクションキャピラリとスクロール圧縮機との間に逆
止弁を設け、圧力条件の変化に伴う圧縮冷媒ガスの被イ
ンジェクション部から液インジェクション回路への逆流
を防止するものである。A refrigerating apparatus according to the present invention is provided with a check valve at a downstream portion of a liquid injection circuit, that is, between a liquid injection capillary and a scroll compressor, and a compressed refrigerant accompanying a change in pressure condition is provided. This is to prevent the backflow of gas from the injected portion to the liquid injection circuit.
【０００７】[0007]
【作用】冷凍装置の高圧部（圧縮機で圧縮されてから絞
り装置に至る迄の系統）の圧力が比較的低く、低圧部
（絞り装置から圧縮機に至る迄の系統）が比較的高い状
態（低圧力差運転時）であって、かつ液インジェクショ
ン回路が「開」である場合、高圧部である凝縮器や冷媒
配管の圧力損失により液インジェクションキャピラリと
スクロール圧縮機との間の圧力が、被インジェクション
部であるスクロール圧縮機の中間圧力よりも低くなるこ
とがある。この場合、後者である中間室の圧力のほうが
前者よりも高いので、圧縮冷媒ガスが、液インジェクシ
ョン取出部（凝縮器通過後）に逆流していたが、本発明
は上記した構成によって、前記逆止弁を設けたことによ
り、この逆流が防止され、絞り装置上流へ冷媒ガスが遮
断されるため、良好な運転が実現される。The pressure of the high pressure part (system from the compressor to the expansion device) of the refrigeration system is relatively low, and the low pressure part (system from the expansion device to the compressor) is relatively high. (At low pressure difference operation), and when the liquid injection circuit is "open", the pressure between the liquid injection capillary and the scroll compressor due to the pressure loss of the condenser or the refrigerant pipe which is the high pressure part, The pressure may be lower than the intermediate pressure of the scroll compressor that is the injection target portion. In this case, since the pressure of the latter intermediate chamber is higher than that of the former, the compressed refrigerant gas was flowing back to the liquid injection take-out portion (after passing through the condenser). By providing the stop valve, this backflow is prevented and the refrigerant gas is shut off upstream of the expansion device, so that good operation is realized.
【０００８】[0008]
実施例１．以下、この発明の一実施例を図を参考にする
が、従来と同一構成については同一符号を付し、その詳
細な説明を省略する。図４に示すように、スクロール８
からなるスクロール圧縮機１の圧縮途中の中間室に液イ
ンジェクションポート９が設けられ、吐出ガス温度の上
昇を防止するようになっている。本発明による冷凍装置
の冷媒回路は図１に示す通りで、液インジェクション回
路は図２と同様の構造となっており、吐出ガス温度の上
昇を抑制する目的で、凝縮器出口の凝縮液化冷媒を制御
入力信号（ここでは図示しない）によって液インジェク
ション電磁弁７ａ、７ｂを開閉し、液インジェクション
流量を所定の量に制限する液インジェクションキャピラ
リを介してインジェクションするようになっているが、
新たに逆流防止用の逆止弁１０が被インジェクション部
の手前、すなわち液インジェクションキャピラリとスク
ロール圧縮機との間に設けられている。なお、この液イ
ンジェクション電磁弁７ａ、７ｂの開閉動作パターンは
従来と同様で、図３に示す通りである。本発明の冷凍装
置は、以上のような構成であるため、液インジェクショ
ンキャピラリとスクロール圧縮機との間の圧力が、被イ
ンジェクション部であるスクロール圧縮機の中間圧力よ
りも低くなる場合であっても、前記逆止弁１０を設けた
ことにより、圧縮冷媒ガスの逆流が防止され、良好な運
転が実現される。Example 1. An embodiment of the present invention will be described below with reference to the drawings, but the same components as those of the related art will be designated by the same reference numerals and detailed description thereof will be omitted. As shown in FIG. 4, scroll 8
A liquid injection port 9 is provided in an intermediate chamber in the middle of compression of the scroll compressor 1 which is configured to prevent the discharge gas temperature from rising. The refrigerant circuit of the refrigerating apparatus according to the present invention is as shown in FIG. 1, and the liquid injection circuit has the same structure as that of FIG. 2, and the condensed liquefied refrigerant at the outlet of the condenser is used for the purpose of suppressing the rise of discharge gas temperature. The liquid injection solenoid valves 7a and 7b are opened and closed by a control input signal (not shown here), and injection is performed via a liquid injection capillary that limits the liquid injection flow rate to a predetermined amount.
A check valve 10 for preventing backflow is newly provided in front of the injection target portion, that is, between the liquid injection capillary and the scroll compressor. The opening / closing operation pattern of the liquid injection solenoid valves 7a and 7b is the same as the conventional one and is as shown in FIG. Since the refrigerating apparatus of the present invention is configured as described above, even when the pressure between the liquid injection capillary and the scroll compressor is lower than the intermediate pressure of the scroll compressor which is the injection target portion. Since the check valve 10 is provided, the reverse flow of the compressed refrigerant gas is prevented and good operation is realized.
【０００９】[0009]
【発明の効果】以上の説明からも明らかなように、本発
明の冷凍装置は液インジェクション回路における逆流が
防止できるので、運転条件により起こる高圧部と低圧部
の圧力差による能力の劣化が防止できる。さらに、気密
試験などの加圧時に起こり得る、低圧部から高圧部への
逆圧印加により、異物などがかみ込むことから起きる電
磁弁不良なども防止できるため、信頼性も更に向上す
る。As is apparent from the above description, the refrigerating apparatus of the present invention can prevent the backflow in the liquid injection circuit, and thus can prevent the deterioration of the capacity due to the pressure difference between the high pressure portion and the low pressure portion caused by the operating conditions. .. Further, since a reverse pressure applied from the low pressure portion to the high pressure portion, which may occur at the time of pressurization such as an airtight test, can prevent a solenoid valve failure caused by foreign matter or the like being caught, the reliability is further improved.
【図１】本発明による冷凍装置の冷媒回路。FIG. 1 is a refrigerant circuit of a refrigeration system according to the present invention.
【図２】従来の冷凍装置の冷媒回路。FIG. 2 is a refrigerant circuit of a conventional refrigeration system.
【図３】従来の冷凍装置の液インジェクション回路の動
作パターンを示す図。FIG. 3 is a diagram showing an operation pattern of a liquid injection circuit of a conventional refrigeration system.
【図４】本発明による冷凍装置のスクロール式圧縮機内
部の構成図。FIG. 4 is a structural diagram of the inside of a scroll compressor of a refrigeration system according to the present invention.
１ スクロール式圧縮機 ２ 凝縮器 ３ 絞り装置 ４ 蒸発器 ５ 液インジェクション回路 ６ａ 液インジェクションキャピラリ ６ｂ 液インジェクションキャピラリ ７ａ 液インジェクション電磁弁 ７ｂ 液インジェクション電磁弁 ８ スクロール ９ インジェクションポート １０ 逆止弁 1 Scroll Type Compressor 2 Condenser 3 Throttling Device 4 Evaporator 5 Liquid Injection Circuit 6a Liquid Injection Capillary 6b Liquid Injection Capillary 7a Liquid Injection Solenoid Valve 7b Liquid Injection Solenoid Valve 8 Scroll 9 Injection Port 10 Check Valve
Claims (1)
器を順次冷媒配管にて閉回路に構成した冷凍装置におい
て、前記凝縮器を通過した凝縮液化冷媒を液インジェク
ションすることにより、前記圧縮機から吐出される冷媒
の吐出温度の上昇を抑制する機構をもつ液インジェクシ
ョン回路を有し、この液インジェクション回路中に、被
インジェクション部から液インジェクション取出部への
逆流を防止するための逆止弁を設けたことを特徴とする
冷凍装置。1. In a refrigeration system in which a compressor, a condenser, a throttle device, and an evaporator are sequentially arranged in a closed circuit with a refrigerant pipe, the condensed liquefied refrigerant that has passed through the condenser is liquid-injected to compress the compressed liquid. It has a liquid injection circuit with a mechanism that suppresses the rise in the discharge temperature of the refrigerant discharged from the machine, and in this liquid injection circuit, a check valve for preventing backflow from the injected part to the liquid injection outlet part. A refrigerating apparatus comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP88892A JPH05187723A (en) | 1992-01-07 | 1992-01-07 | Refrigerating plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP88892A JPH05187723A (en) | 1992-01-07 | 1992-01-07 | Refrigerating plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05187723A true JPH05187723A (en) | 1993-07-27 |
Family
ID=11486220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP88892A Pending JPH05187723A (en) | 1992-01-07 | 1992-01-07 | Refrigerating plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05187723A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008541000A (en) * | 2005-05-19 | 2008-11-20 | クォンタム エナジー テクノロジーズ プロプライアトリー リミテッド | Heat pump device and fluid heating method |
| WO2009004779A1 (en) * | 2007-06-29 | 2009-01-08 | Daikin Industries, Ltd. | Refrigeration system |
| JP2009030954A (en) * | 2007-06-29 | 2009-02-12 | Daikin Ind Ltd | Refrigeration system |
| JP2009180451A (en) * | 2008-01-31 | 2009-08-13 | Daikin Ind Ltd | Refrigeration system |
| JP2016223741A (en) * | 2015-06-03 | 2016-12-28 | 東芝キヤリア株式会社 | Refrigeration cycle device |
-
1992
- 1992-01-07 JP JP88892A patent/JPH05187723A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008541000A (en) * | 2005-05-19 | 2008-11-20 | クォンタム エナジー テクノロジーズ プロプライアトリー リミテッド | Heat pump device and fluid heating method |
| WO2009004779A1 (en) * | 2007-06-29 | 2009-01-08 | Daikin Industries, Ltd. | Refrigeration system |
| JP2009030954A (en) * | 2007-06-29 | 2009-02-12 | Daikin Ind Ltd | Refrigeration system |
| JP2009180451A (en) * | 2008-01-31 | 2009-08-13 | Daikin Ind Ltd | Refrigeration system |
| JP2016223741A (en) * | 2015-06-03 | 2016-12-28 | 東芝キヤリア株式会社 | Refrigeration cycle device |
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