JP2000274859A - Refrigerator - Google Patents
RefrigeratorInfo
- Publication number
- JP2000274859A JP2000274859A JP11073699A JP7369999A JP2000274859A JP 2000274859 A JP2000274859 A JP 2000274859A JP 11073699 A JP11073699 A JP 11073699A JP 7369999 A JP7369999 A JP 7369999A JP 2000274859 A JP2000274859 A JP 2000274859A
- Authority
- JP
- Japan
- Prior art keywords
- expansion valve
- electric expansion
- refrigerant
- main
- circuit
- 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
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
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、過冷却回路とイ
ンジェクション回路を備えた冷凍装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus having a subcooling circuit and an injection circuit.
【０００２】[0002]
【従来の技術】従来、この種の冷凍装置としては、図４
に示すものがある。この冷凍装置は、圧縮機５１と凝縮
器５２と過冷却熱交換器５３と主電動膨張弁５４と蒸発
器５５とアキュムレータ５６が順に接続された主回路５
７を有する。上記凝縮器５２と過冷却熱交換器５３との
間で主回路５７から分岐した分岐管６０は、上記過冷却
熱交換器５３の内管５３Ａに接続されている。2. Description of the Related Art Conventionally, as this type of refrigeration apparatus, FIG.
There are the following. This refrigerating apparatus has a main circuit 5 in which a compressor 51, a condenser 52, a supercooling heat exchanger 53, a main electric expansion valve 54, an evaporator 55, and an accumulator 56 are connected in order.
Seven. A branch pipe 60 branched from the main circuit 57 between the condenser 52 and the subcooling heat exchanger 53 is connected to an inner pipe 53A of the subcooling heat exchanger 53.
【０００３】この内管５３Ａは、外管６１内を主流の下
流から上流へ延びて、インジェクション配管６２に接続
されている。上記分岐管６０は副電動膨張弁６３を有し
ている。上記インジェクション配管６２は、圧縮機５１
の中間圧の部分５１Ａに接続されている。[0003] The inner pipe 53A extends from the downstream of the main flow to the upstream in the outer pipe 61, and is connected to an injection pipe 62. The branch pipe 60 has an auxiliary electric expansion valve 63. The injection pipe 62 is connected to the compressor 51.
Is connected to the intermediate pressure portion 51A.
【０００４】この冷凍装置は、過冷却熱交換器５３,分
岐管６０,副電動膨張弁６３が構成する過冷却回路によ
って、凝縮器５２から主電動膨張弁５４に向かう冷媒を
過冷却して、冷凍効率の向上を図る。さらに、過冷却熱
交換器５３で吸熱した分岐管６０からの分岐冷媒をイン
ジェクション配管６２から圧縮機５１の中間圧の部分５
１Ａに注入することによって、冷凍効率の向上を図って
いる。In this refrigerating apparatus, the refrigerant flowing from the condenser 52 to the main electric expansion valve 54 is supercooled by a subcooling circuit constituted by the subcooling heat exchanger 53, the branch pipe 60, and the auxiliary electric expansion valve 63. Improve refrigeration efficiency. Further, the branched refrigerant from the branch pipe 60 that has absorbed heat in the supercooling heat exchanger 53 is transferred from the injection pipe 62 to the intermediate pressure portion 5 of the compressor 51.
By injecting into 1A, the refrigeration efficiency is improved.
【０００５】[0005]
【発明が解決しようとする課題】ところで、インジェク
ション回路に電動弁などの減圧機構を持つ冷媒回路によ
って冷媒制御を行う場合、インジェクション用副電動膨
張弁６３が流す流量を主電動膨張弁５４が流す流量より
少なくする必要がある。何故ならば、副電動膨張弁６３
が流す冷媒量が、主電動膨張弁５４が流す冷媒量よりも
多いと、過冷却熱交換器５３で冷媒が蒸発しきれず、過
度の液冷媒が圧縮機５１に注入されるからである。過度
の液冷媒が圧縮機５１に注入されると、液圧縮の恐れが
あり、また、メイン側熱交換器である蒸発器５５への流
量減となり、性能ダウンにつながる。When refrigerant control is performed by a refrigerant circuit having a pressure reducing mechanism such as an electric valve in the injection circuit, the flow rate of the auxiliary electric expansion valve 63 for injection is reduced by the flow rate of the main electric expansion valve 54. Need to be less. Because the auxiliary electric expansion valve 63
Is greater than the amount of refrigerant flowing through the main electric expansion valve 54, the refrigerant cannot be completely evaporated in the supercooling heat exchanger 53, and excessive liquid refrigerant is injected into the compressor 51. If excessive liquid refrigerant is injected into the compressor 51, there is a risk of liquid compression, and the flow rate to the evaporator 55, which is the main-side heat exchanger, decreases, leading to a reduction in performance.
【０００６】上記従来の冷凍装置では、主電動膨張弁５
４と副電動膨張弁６３を、運転周波数やサーミスタ温度
によって、各々独立して制御していたので、過渡状態で
は上記のような過度のインジェクションが発生する恐れ
があった。In the above-mentioned conventional refrigeration system, the main electric expansion valve 5
4 and the auxiliary electric expansion valve 63 are independently controlled by the operating frequency and the thermistor temperature, so that in the transient state, there is a possibility that the above-described excessive injection may occur.
【０００７】そこで、この発明の目的は、過度のインジ
ェクションを防止できる過冷却回路とインジェクション
回路を備えた冷凍装置を提供することにある。An object of the present invention is to provide a refrigeration system having a supercooling circuit and an injection circuit that can prevent excessive injection.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、この発明の請求項１の発明の冷凍装置は、凝縮器と
主膨張機構との間に順に設けた副膨張機構と過冷却熱交
換器を有する過冷却回路と、上記過冷却熱交換器からの
ガス冷媒を圧縮機の中間圧部分に注入するインジェクシ
ョン回路を備える冷凍装置であって、上記主,副膨張機
構は、主,副電動膨張弁からなり、上記副電動膨張弁が
冷媒を流す能力が、上記主電動膨張弁が冷媒を流す能力
よりも小さくなるように、副電動膨張弁の上限の開度を
制御する膨張弁制御手段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 refrigeration system comprising: a sub-expansion mechanism provided between a condenser and a main expansion mechanism; A refrigerating apparatus comprising: a supercooling circuit having a heat exchanger; and an injection circuit for injecting a gas refrigerant from the supercooling heat exchanger into an intermediate pressure portion of a compressor. Expansion valve control means for controlling an upper limit opening of the auxiliary electric expansion valve such that the auxiliary electric expansion valve has an ability to flow the refrigerant, and the main electric expansion valve has an ability to flow the refrigerant. It is characterized by having.
【０００９】この請求項１の発明の冷凍装置では、膨張
弁制御手段が、副電動膨張弁の上限の開度を制御して、
副電動膨張弁が冷媒を流す能力を、主電動膨張弁が冷媒
を流す能力よりも小さくする。したがって、この発明に
よれば、過度のインジェクションを回避して圧縮機の信
頼性向上を果たしつつ、過冷却回路とインジェクション
回路によって冷凍効率を向上できる。In the refrigeration apparatus according to the first aspect of the present invention, the expansion valve control means controls the upper limit opening of the auxiliary electric expansion valve,
The capacity of the auxiliary electric expansion valve to flow the refrigerant is made smaller than the capacity of the main electric expansion valve to flow the refrigerant. Therefore, according to the present invention, the refrigerating efficiency can be improved by the supercooling circuit and the injection circuit while avoiding excessive injection and improving the reliability of the compressor.
【００１０】また、請求項２の発明は、請求項１に記載
の冷凍装置において、上記主電動膨張弁と副電動膨張弁
は、構造,寸法が同一の電動膨張弁からなることを特徴
としている。According to a second aspect of the present invention, in the refrigeration system according to the first aspect, the main motor-operated expansion valve and the sub-motor-operated expansion valve are formed of motor-operated expansion valves having the same structure and dimensions. .
【００１１】この請求項２の発明では、主電動膨張弁と
副電動膨張弁は、構造,寸法が同一の電動膨張弁からな
るから、部品を共通化でき、コストダウンを図れる。According to the second aspect of the present invention, since the main motor-operated expansion valve and the auxiliary motor-operated expansion valve are formed of the same motor-operated expansion valve having the same structure and dimensions, parts can be used in common and cost can be reduced.
【００１２】[0012]
【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.
【００１３】図１に、この発明の冷凍装置の実施の形態
としての空気調和機を示す。この実施形態は、圧縮機
１,四路切換弁２,室外熱交換器３,整流回路５,室内熱交
換器６が順に接続された冷媒回路を有する。上記室内熱
交換器６は、アキュムレータ７ａ,７ｂを経由して圧縮
機１の吸入側に接続されている。FIG. 1 shows an air conditioner as an embodiment of a refrigeration apparatus according to the present invention. This embodiment has a refrigerant circuit in which a compressor 1, a four-way switching valve 2, an outdoor heat exchanger 3, a rectifier circuit 5, and an indoor heat exchanger 6 are sequentially connected. The indoor heat exchanger 6 is connected to the suction side of the compressor 1 via accumulators 7a and 7b.
【００１４】上記整流回路５は、第１,第２逆止弁１１,
１２の直列接続回路と第３,第４逆止弁１３,１４の直列
接続回路とが並列に接続された回路である。第１逆止弁
１１と第２逆止弁１２は、それらの接続点Ｐ１に向かっ
て順方向になるように接続されており、第３逆止弁１３
と第４逆止弁１４は、それらの接続点Ｐ２に向かって逆
方向になるように接続されている。The rectifier circuit 5 includes first and second check valves 11,
12 is a circuit in which a series connection circuit of 12 and a series connection circuit of the third and fourth check valves 13 and 14 are connected in parallel. The first check valve 11 and the second check valve 12 are connected so as to be in a forward direction toward their connection point P1, and the third check valve 13
And the fourth check valve 14 are connected in the opposite direction toward their connection point P2.
【００１５】そして、上記整流回路５の接続点Ｐ１とＰ
２の間に、過冷却回路８と主電動膨張弁９およびインジ
ェクション回路１０が接続されている。The connection points P1 and P of the rectifier circuit 5
2, a supercooling circuit 8, a main motor-operated expansion valve 9, and an injection circuit 10 are connected.
【００１６】過冷却回路８は、過冷却熱交換器１５とイ
ンジェクション用副電動膨張弁１６とで構成されてい
る。この過冷却熱交換器１５は、接続点Ｐ１と主電動弁
９の間に接続されている。また、インジェクション用副
電動膨張弁１６は、接続点Ｐ１から分岐して過冷却熱交
換器１５内の内管２１の入口２１ａに接続されている。
そして、この内管２１の出口２１ｂはインジェクション
配管２２に接続されており、このインジェクション配管
２２は、上記圧縮機１の中間圧の箇所１aに接続されて
いる。The subcooling circuit 8 includes a subcooling heat exchanger 15 and a sub-electric expansion valve 16 for injection. The supercooling heat exchanger 15 is connected between the connection point P1 and the main motor-operated valve 9. The sub-electric expansion valve 16 for injection branches off from the connection point P <b> 1 and is connected to the inlet 21 a of the inner pipe 21 in the subcooling heat exchanger 15.
The outlet 21b of the inner pipe 21 is connected to an injection pipe 22, and the injection pipe 22 is connected to a point 1a of the compressor 1 at an intermediate pressure.
【００１７】次に、上記構成の空気調和機の基本動作を
説明する。なお、図３には、図１の冷媒回路の各部Ｑ１
〜Ｑ８でのモリエル線図上での状態を示している。ま
ず、四路切換弁２が、図１に破線で示す経路を連通さ
せ、冷房位置にあるときには、圧縮機１が吐出した冷媒
は、室外熱交換器３で凝縮されて、整流回路５の第１逆
止弁１１に流入し、接続点Ｐ１でインジェクション用副
電動膨張弁１６へのサブ流と過冷却熱交換器１５へのメ
イン流とに分かれる。上記メイン流は、この過冷却熱交
換器１５で過冷却されてから、主電動弁９で膨張して、
接続点Ｐ２,第４逆止弁１４を通って、室内熱交換器６
に至る。そして、室内熱交換器６で蒸発したメイン流
は、四路切換弁２,アキュムレータ７ａ,７ｂを経て、圧
縮機１の吸入側に戻る。Next, the basic operation of the air conditioner having the above configuration will be described. FIG. 3 shows each part Q1 of the refrigerant circuit of FIG.
The state on the Mollier diagram at Q8 is shown. First, when the four-way switching valve 2 communicates the path shown by the broken line in FIG. 1 and is in the cooling position, the refrigerant discharged from the compressor 1 is condensed in the outdoor heat exchanger 3 and 1 flows into the check valve 11 and is divided into a sub flow to the sub-electric injection expansion valve 16 and a main flow to the subcooling heat exchanger 15 at the connection point P1. The main flow is subcooled by the subcooling heat exchanger 15 and then expanded by the main motor-operated valve 9 to
Through the connection point P2 and the fourth check valve 14, the indoor heat exchanger 6
Leads to. Then, the main stream evaporated in the indoor heat exchanger 6 returns to the suction side of the compressor 1 via the four-way switching valve 2 and the accumulators 7a and 7b.
【００１８】一方、上記サブ流は、上記インジェクショ
ン用副電動膨張弁１６で膨張されてから、過冷却熱交換
器１５の内管２１を通って、吸熱してから、インジェク
ション配管２２を通って、圧縮機１の中間圧の箇所１ａ
に注入される。On the other hand, the sub-stream is expanded by the sub-electric injection expansion valve 16, passes through the inner pipe 21 of the supercooling heat exchanger 15, absorbs heat, passes through the injection pipe 22, Intermediate pressure point 1a of compressor 1
Is injected into.
【００１９】また、上記四路切換弁２が、図１に実線で
示す経路を連通させて、暖房位置にあるときには、圧縮
機１が吐出した冷媒は、室内熱交換器６で凝縮されて、
整流回路５の第２逆止弁１２に流入し、接続点Ｐ１でイ
ンジェクション用副電動膨張弁１６へのサブ流と過冷却
熱交換器１５へのメイン流とに分かれる。上記メイン流
は、過冷却熱交換器１５で過冷却されてから、主電動膨
張弁９で膨張して、接続点Ｐ２,第３逆止弁１３を通っ
て、室外熱交換器３に至る。そして、室外熱交換器３で
蒸発したメイン流は、四路切換弁２,アキュムレータ７
ａ,７ｂを経て、圧縮機１の吸入側に戻る。一方、上記
サブ流は、インジェクション用副電動膨張弁１６で膨張
されてから、過冷却熱交換器１５の内管２１を通って吸
熱してから、インジェクション配管２２を通って、圧縮
機１の中間圧の箇所１ａに注入される。When the four-way switching valve 2 communicates with the path shown by the solid line in FIG. 1 and is in the heating position, the refrigerant discharged from the compressor 1 is condensed in the indoor heat exchanger 6,
It flows into the second check valve 12 of the rectifier circuit 5 and is divided into a sub flow to the injection sub-electric expansion valve 16 and a main flow to the subcooling heat exchanger 15 at a connection point P1. The main stream is supercooled by the supercooling heat exchanger 15, expanded by the main electric expansion valve 9, passes through the connection point P 2, the third check valve 13, and reaches the outdoor heat exchanger 3. The main flow evaporated in the outdoor heat exchanger 3 is supplied to the four-way switching valve 2 and the accumulator 7.
After returning to the suction side of the compressor 1 via a and 7b. On the other hand, the sub-flow is expanded by the auxiliary electric expansion valve for injection 16, then absorbs heat through the inner pipe 21 of the subcooling heat exchanger 15, passes through the injection pipe 22, and passes through the middle of the compressor 1. It is injected into the pressure point 1a.
【００２０】このように、この実施の形態によれば、整
流回路５の働きによって、冷房時にも暖房時にも、過冷
却および、圧縮機１の中間圧の箇所１ａへのガス冷媒の
注入を行える。したがって、冷暖両方において、過冷却
とガスインジェクションによる効率の向上を図ることが
できる。As described above, according to this embodiment, by the operation of the rectifier circuit 5, the supercooling and the injection of the gas refrigerant into the intermediate pressure portion 1a of the compressor 1 can be performed during the cooling and the heating. . Therefore, in both cooling and heating, efficiency can be improved by supercooling and gas injection.
【００２１】また、この実施形態によれば、インジェク
ション用副電動膨張弁１６を全閉にすることで、インジ
ェクション回路１０のインジェクション動作をオフにで
きる。また、副電動膨張弁１６の開度を所望の開度に制
御することによって、過冷却回路８による過冷却度およ
びインジェクション回路１０による注入量を所望の値に
設定できる。Further, according to this embodiment, the injection operation of the injection circuit 10 can be turned off by fully closing the sub electric expansion valve 16 for injection. Further, by controlling the degree of opening of the auxiliary electric expansion valve 16 to a desired degree, the degree of supercooling by the subcooling circuit 8 and the amount of injection by the injection circuit 10 can be set to desired values.
【００２２】次に、この実施形態でのインジェクション
用副電動膨張弁１６の制御動作を、図２のフローチャー
トを参照しながら説明する。なお、この制御を行う装置
としては、ここでは、マイクロコンピュータで構成した
制御部１０１を用いた。Next, a control operation of the injection sub-electric expansion valve 16 in this embodiment will be described with reference to a flowchart of FIG. Here, as a device for performing this control, a control unit 101 constituted by a microcomputer was used.
【００２３】まず、ステップＳ１では、制御部１０１
は、過冷却熱交換器１５の内管２１の入口に接続された
配管３１に取り付けられた温度センサ３３から内管２１
の入口付近の冷媒温度ｔ１を得て、この冷媒温度ｔ１に
基づいて、副電動膨張弁１６の目標開度ＥＶＭＫＢを算
出する。次に、ステップＳ２に進み、制御部１０１は、
主電動膨張弁９の現在の開度ＥＶＲＬＡを読み込む。こ
の主電動膨張弁９の開度ＥＶＲＬＡは、圧縮機１の吐出
管に取り付けた温度センサ３５,室内熱交換器６に取り
付けた温度センサ３６,室外熱交換器３に取り付けた温
度センサ３７からそれぞれ得た温度ｔ２,ｔ３,ｔ４に基
づいて制御される。First, in step S1, the control unit 101
From the temperature sensor 33 attached to the pipe 31 connected to the inlet of the inner pipe 21 of the subcooling heat exchanger 15
A refrigerant temperature t1 near the inlet is obtained, and a target opening EVMKB of the auxiliary electric expansion valve 16 is calculated based on the refrigerant temperature t1. Next, proceeding to step S2, the control unit 101
The current opening EVRLA of the main electric expansion valve 9 is read. The opening EVRLA of the main electric expansion valve 9 is obtained from a temperature sensor 35 attached to the discharge pipe of the compressor 1, a temperature sensor 36 attached to the indoor heat exchanger 6, and a temperature sensor 37 attached to the outdoor heat exchanger 3, respectively. Control is performed based on the obtained temperatures t2, t3, and t4.
【００２４】次に、ステップＳ３に進み、副電動膨張弁
１６の開度上限値を、次式(１)で算出する。Next, the routine proceeds to step S3, where the upper limit of the opening of the auxiliary electric expansion valve 16 is calculated by the following equation (1).
【００２５】 上限開度＝(ＥＶＲＬＡ)×α＋β ………(１) α＜１，βは、上限開度を(ＥＶＲＬＡ)よりも小さくす
るような値次に、ステップＳ４に進み、目標開度ＥＶＭ
ＫＢが、上記上限開度よりも大きいか否かを判断する。
目標開度ＥＶＭＫＢが、上記上限開度よりも大きいと判
断すれば、ステップＳ５に進み、上記目標開度ＥＶＭＫ
Ｂを上記上限開度に修正する。一方、目標開度ＥＶＭＫ
Ｂが、上記上限開度よりも大きくないと判断すれば、ス
テップＳ６に進み、制御部１０１は、副電動膨張弁１６
に信号を送り、目標開度ＥＶＭＫＢにする。Upper limit opening = (EVRLA) × α + β (1) α <1, β is a value that makes the upper limit opening smaller than (EVRLA). Then, the process proceeds to step S4, where the target opening is set. EVM
It is determined whether or not KB is larger than the upper limit opening.
If it is determined that the target opening EVMKB is larger than the upper limit opening, the process proceeds to step S5, where the target opening EVMK is set.
Correct B to the upper limit opening. On the other hand, the target opening EVMK
If it is determined that B is not larger than the upper limit opening, the process proceeds to step S6, where the control unit 101
To the target opening EVMKB.
【００２６】この実施形態では、膨張弁制御部１０１
が、副電動膨張弁１６の上限の開度を制御して、副電動
膨張弁１６が冷媒を流す能力を、主電動膨張弁９が冷媒
を流す能力よりも小さくする。したがって、この実施形
態によれば、副電動膨張弁１６の開き過ぎによる過度の
インジェクションを回避して圧縮機１の故障を回避しつ
つ、過冷却回路８とインジェクション回路によって空気
調和効率を向上できる。In this embodiment, the expansion valve control unit 101
However, the opening degree of the upper limit of the auxiliary electric expansion valve 16 is controlled so that the ability of the auxiliary electric expansion valve 16 to flow the refrigerant is smaller than the ability of the main electric expansion valve 9 to flow the refrigerant. Therefore, according to this embodiment, the air conditioning efficiency can be improved by the supercooling circuit 8 and the injection circuit, while avoiding excessive injection due to excessive opening of the sub-electric expansion valve 16 and avoiding failure of the compressor 1.
【００２７】なお、上記主電動膨張弁９と副電動膨張弁
１６を、構造,寸法が同一の電動膨張弁で構成した場合
には、部品を共通化でき、コストダウンを図れる。When the main electric expansion valve 9 and the auxiliary electric expansion valve 16 are constituted by electric expansion valves having the same structure and dimensions, parts can be shared and cost can be reduced.
【００２８】[0028]
【発明の効果】以上より明らかなように、この請求項１
の発明の冷凍装置は、凝縮器と主膨張機構との間に順に
設けた副膨張機構と過冷却熱交換器を有する過冷却回路
と、上記過冷却熱交換器からのガス冷媒を圧縮機の中間
圧部分に注入するインジェクション回路を備える冷凍装
置であって、主,副膨張機構は、主,副電動膨張弁からな
り、副電動膨張弁が冷媒を流す能力が、主電動膨張弁が
冷媒を流す能力よりも小さくなるように、副電動膨張弁
の上限の開度を制御する膨張弁制御手段を備えた。As is apparent from the above description, this claim 1
The refrigerating apparatus of the invention comprises a subcooling circuit having a sub-expansion mechanism and a subcooling heat exchanger provided in order between the condenser and the main expansion mechanism, and a gas refrigerant from the subcooling heat exchanger, A refrigerating apparatus having an injection circuit for injecting the refrigerant into an intermediate pressure portion, wherein the main and sub expansion mechanisms comprise a main and sub electric expansion valve, the sub electric expansion valve has a capacity to flow refrigerant, and the main electric expansion valve supplies refrigerant. Expansion valve control means for controlling the upper limit opening of the auxiliary electric expansion valve so as to be smaller than the flow capability is provided.
【００２９】この請求項１の発明の冷凍装置では、膨張
弁制御手段が、副電動膨張弁の上限の開度を制御して、
副電動膨張弁が冷媒を流す能力を、主電動膨張弁が冷媒
を流す能力よりも小さくする。したがって、この発明に
よれば、過度のインジェクションを回避して圧縮機の信
頼性向上を果たしつつ、過冷却回路とインジェクション
回路によって冷凍効率を向上できる。In the refrigeration system according to the first aspect of the present invention, the expansion valve control means controls the upper limit opening of the auxiliary electric expansion valve,
The capacity of the auxiliary electric expansion valve to flow the refrigerant is made smaller than the capacity of the main electric expansion valve to flow the refrigerant. Therefore, according to the present invention, the refrigerating efficiency can be improved by the supercooling circuit and the injection circuit while avoiding excessive injection and improving the reliability of the compressor.
【００３０】また、請求項２の発明は、請求項１に記載
の冷凍装置において、上記主電動膨張弁と副電動膨張弁
は、構造,寸法が同一の電動膨張弁からなる。この請求
項２の発明では、主電動膨張弁と副電動膨張弁は、構
造,寸法が同一の電動膨張弁からなるから、部品を共通
化でき、コストダウンを図れる。According to a second aspect of the present invention, in the refrigeration system according to the first aspect, the main motor-operated expansion valve and the auxiliary motor-operated expansion valve are formed of the same electric motor-operated expansion valve. According to the second aspect of the present invention, since the main electric expansion valve and the auxiliary electric expansion valve are composed of electric expansion valves having the same structure and dimensions, parts can be shared and cost can be reduced.
【図１】 この発明の冷凍装置の実施の形態としての空
気調和機の冷媒回路図である。FIG. 1 is a refrigerant circuit diagram of an air conditioner as an embodiment of a refrigeration apparatus of the present invention.
【図２】 上記空気調和機のインジェクション用電動式
膨張弁の制御動作を説明するフローチャートである。FIG. 2 is a flowchart illustrating a control operation of an injection electric expansion valve of the air conditioner.
【図３】 上記空気調和機の動作を説明するモリエル線
図である。FIG. 3 is a Mollier diagram illustrating the operation of the air conditioner.
【図４】 従来の冷凍装置の冷媒回路図である。FIG. 4 is a refrigerant circuit diagram of a conventional refrigeration apparatus.
１…圧縮機、１ａ…中間圧の箇所、２…四路切換弁、３
…室外熱交換器、５…整流回路、６…室内熱交換器、７
…アキュムレータ、８…過冷却回路、９…主電動弁、１
０…インジェクション回路、１１…第１逆止弁、１２…
第２逆止弁、１３…第３逆止弁、１４…第４逆止弁、１
５…過冷却熱交換器、１６…インジェクション用電動式
膨張弁、２１…内管、２１ａ…入口、２１ｂ…出口、２
２…インジェクション配管、Ｐ１,Ｐ２…接続点、３３,
３５,３６,３７…温度センサ、１０１…膨張弁制御部。DESCRIPTION OF SYMBOLS 1 ... Compressor, 1a ... Intermediate pressure part, 2 ... Four-way switching valve, 3
... outdoor heat exchanger, 5 ... rectifier circuit, 6 ... indoor heat exchanger, 7
... accumulator, 8 ... supercooling circuit, 9 ... main motorized valve, 1
0: injection circuit, 11: first check valve, 12:
2nd check valve, 13 ... 3rd check valve, 14 ... 4th check valve, 1
5: supercooling heat exchanger, 16: electric expansion valve for injection, 21: inner tube, 21a: inlet, 21b: outlet, 2
2 ... Injection piping, P1, P2 ... Connection point, 33,
35, 36, 37: temperature sensor, 101: expansion valve control unit.
Claims (2)
に順に設けた副膨張機構(１６)と過冷却熱交換器(１５)
を有する過冷却回路(８)と、上記過冷却熱交換器(１５)
からのガス冷媒を圧縮機(１)の中間圧部分(１ａ)に注入
するインジェクション回路(１０)を備える冷凍装置であ
って、 上記主,副膨張機構は、主,副電動膨張弁(９,１６)から
なり、 上記副電動膨張弁(１６)が冷媒を流す能力が、上記主電
動膨張弁(９)が冷媒を流す能力よりも小さくなるよう
に、副電動膨張弁(１６)の上限の開度を制御する膨張弁
制御手段(１０１)を備えたことを特徴とする冷凍装置。1. A sub-expansion mechanism (16) and a subcooling heat exchanger (15) provided in order between a condenser (3, 6) and a main expansion mechanism (9).
A supercooling circuit (8) having a subcooling heat exchanger (15)
Refrigeration system comprising an injection circuit (10) for injecting gas refrigerant from the compressor (1) into the intermediate pressure portion (1a) of the compressor (1), wherein the main and sub expansion mechanisms are main and sub electric expansion valves (9, 16). The upper limit of the auxiliary electric expansion valve (16) is set so that the auxiliary electric expansion valve (16) has a smaller capacity to flow the refrigerant than the main electric expansion valve (9) has a smaller capacity to flow the refrigerant. A refrigerating apparatus comprising an expansion valve control means (101) for controlling an opening degree.
寸法が同一の電動膨張弁からなることを特徴とする冷凍
装置。2. The refrigerating apparatus according to claim 1, wherein the main electric expansion valve (9) and the sub electric expansion valve (16) have a structure,
A refrigeration system comprising motorized expansion valves having the same dimensions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07369999A JP4269397B2 (en) | 1999-03-18 | 1999-03-18 | Refrigeration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07369999A JP4269397B2 (en) | 1999-03-18 | 1999-03-18 | Refrigeration equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000274859A true JP2000274859A (en) | 2000-10-06 |
| JP4269397B2 JP4269397B2 (en) | 2009-05-27 |
Family
ID=13525734
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07369999A Expired - Fee Related JP4269397B2 (en) | 1999-03-18 | 1999-03-18 | Refrigeration equipment |
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| Country | Link |
|---|---|
| JP (1) | JP4269397B2 (en) |
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