JP3163115B2 - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JP3163115B2 JP3163115B2 JP16451091A JP16451091A JP3163115B2 JP 3163115 B2 JP3163115 B2 JP 3163115B2 JP 16451091 A JP16451091 A JP 16451091A JP 16451091 A JP16451091 A JP 16451091A JP 3163115 B2 JP3163115 B2 JP 3163115B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- compressors
- compressor
- capacity
- refrigeration cycle
- 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.)
- Expired - Fee Related
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
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
Description
【０００１】[0001]
【産業上の利用分野】この発明は、圧縮機、室外熱交換
器、減圧器、室内熱交換器を順次接続して冷凍サイクル
を構成した空気調和機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner in which a refrigeration cycle is constructed by sequentially connecting a compressor, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger.
【０００２】[0002]
【従来の技術】一般に、空気調和機は、圧縮機、室外熱
交換器、減圧器、室内熱交換器を順次接続して冷凍サイ
クルを構成し、室内熱交換器を蒸発器あるいは凝縮器と
して働かせることにより、室内を空調する。2. Description of the Related Art Generally, an air conditioner forms a refrigeration cycle by sequentially connecting a compressor, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger, and operates the indoor heat exchanger as an evaporator or a condenser. Thereby, the room is air-conditioned.
【０００３】この空気調和機の最近の傾向として、スク
ロール形の圧縮機を搭載したものが多くなっている。こ
のスクロール形の圧縮機は、弁構造がないため構造が簡
単で、しかも静寂性にすぐれるなどの利点がある。一
方、空気調和機を駆動方式で分けると、インバータ駆動
の能力可変圧縮機、および商用電源駆動の能力固定圧縮
機がある。As a recent tendency of the air conditioners, many air conditioners equipped with a scroll type compressor are increasing. This scroll-type compressor has advantages such as a simple structure since there is no valve structure and excellent quietness. On the other hand, when air conditioners are divided by drive system, there are inverter-driven variable-capacity compressors and commercial power-driven fixed-capacity compressors.
【０００４】インバータ駆動の能力可変圧縮機は、商用
交流電源の電圧がインバータで所定周波数の電圧に変化
され、それが駆動電力として圧縮機モータに供給される
ことにより駆動が行なわれる。商用交流電源駆動の能力
固定圧縮機は、電磁接触器の接点を介して商用交流電源
に接続され、その接触器接点の開閉によって運転が制御
される。[0004] Inverter-driven variable capacity compressors are driven by changing the voltage of a commercial AC power supply to a voltage of a predetermined frequency by an inverter and supplying the voltage to the compressor motor as drive power. A fixed capacity compressor driven by a commercial AC power supply is connected to a commercial AC power supply via a contact of an electromagnetic contactor, and its operation is controlled by opening and closing the contactor contact.
【０００５】[0005]
【発明が解決しようとする課題】ところで、スクロール
形の圧縮機には、何らかの原因で圧縮比が高くなった場
合に、温度が異常に上昇し、破損に至る心配がある。However, in the case of a scroll-type compressor, if the compression ratio is increased for some reason, there is a concern that the temperature will rise abnormally and breakage will occur.
【０００６】また、冷凍サイクルの全般についていえる
ことであるが、配管などでの熱損失により、空調能力の
低下を生じることがある。これは、特に暖房運転時に顕
著であり、部屋の中がなかなか暖まらないという現象を
生じる。In addition, as can be said for the entire refrigeration cycle, heat loss in piping or the like may cause a decrease in air conditioning capacity. This is particularly noticeable during the heating operation, and causes a phenomenon in which the inside of the room is hardly heated.
【０００７】商用交流電源駆動の能力固定圧縮機につい
て見ると、電磁接触器の接点に溶着等の故障が生じた場
合、運転停止であるにもかかわらず圧縮機の運転が継続
してしまう。こうなると、圧縮機や他の冷凍サイクル機
器が破損してしまう。この発明は上記の事情を考慮した
もので、請求項１の空気調和機は、圧縮機の圧縮比が高
くなっても、それによる圧縮機の破損を未然に防ぐこと
ができ、しかも配管などでの熱損失を補って十分な空調
能力を確保することを目的とする。請求項２の空気調和
機は、圧縮機の不要な運転継続に際して圧縮機を始めと
する冷凍サイクル機器の安全を確保することを目的とす
る。[0007] Regarding a fixed capacity compressor driven by a commercial AC power supply, when a failure such as welding occurs at a contact of an electromagnetic contactor, the operation of the compressor continues even though the operation is stopped. This would damage the compressor and other refrigeration cycle equipment. The present invention has been made in view of the above circumstances, and the air conditioner according to claim 1 can prevent the compressor from being damaged even if the compression ratio of the compressor is high , and furthermore, it is possible to use piping and the like. Air conditioning to compensate for heat loss
The purpose is to secure the ability . It is an object of the air conditioner of claim 2 to ensure the safety of the refrigeration cycle equipment including the compressor when the compressor is not required to continue operation.
【０００８】[0008]
【課題を解決するための手段】請求項１の空気調和機
は、能力可変圧縮機および能力固定圧縮機からなる複数
台の圧縮機、室外熱交換器、減圧器、複数台の室内熱交
換器を接続した冷凍サイクルと、この冷凍サイクルの高
圧側圧力および低圧側圧力をそれぞれ検知する圧力セン
サと、上記複数台の室内熱交換器の空調負荷の総和に応
じて上記複数台の圧縮機の運転台数および能力を制御す
る手段と、上記複数台の各圧縮機から吐出される冷媒の
温度を検知する複数の温度センサと、上記各圧力センサ
の検知圧力から上記圧縮機の圧縮比を求める手段と、こ
の圧縮比が設定値以上でかつ上記複数の温度センサのい
ずれかの検知温度が設定値以上のとき、上記複数台の圧
縮機の運転台数あるいは能力を低減する手段と、上記圧
縮比が設定値以下でかつ上記高圧側圧力が所定値以下に
下がったとき、上記複数台の圧縮機の運転台数あるいは
能力を増大する手段とを備える。According to a first aspect of the present invention, there is provided an air conditioner comprising a variable capacity compressor and a fixed capacity compressor.
Pedestal compressor, an outdoor heat exchanger, a pressure reducer, a refrigeration cycle that connects a plurality of indoor heat exchangers, and a pressure sensor for detecting a high side pressure and the low side pressure of the refrigeration cycle, respectively, of the plurality of According to the total air conditioning load of the indoor heat exchanger
Control the number and capacity of the multiple compressors
Means for detecting the temperature of the refrigerant discharged from each of the plurality of compressors, means for determining the compression ratio of the compressor from the pressure detected by each of the pressure sensors, equal to or greater than a set value and have the plurality of temperature sensors
When the detected temperature of Zureka is equal to or greater than a preset value, the upper Symbol plurality of pressure
Means to reduce the number or capacity of compressors
The compression ratio is below a set value and the high pressure side pressure is below a predetermined value.
When lowered, the number of operating multiple compressors or
Means for increasing capacity .
【０００９】請求項２の空気調和機は、能力可変圧縮機
および商用電源に接続された電磁接触器の開閉により運
転停止される能力固定圧縮機からなる複数台の圧縮機、
室外熱交換器、減圧器、複数台の室内熱交換器を接続し
た冷凍サイクルと、この冷凍サイクルの高圧側圧力およ
び低圧側圧力をそれぞれ検知する圧力センサと、上記室
外熱交換器に外気を循環させる室外ファンと、上記複数
台の室内熱交換器の空調負荷の総和に応じて上記複数台
の圧縮機の運転台数および能力を制御する手段と、この
制御手段により上記複数台の全ての圧縮機の運転停止時
に上記圧力センサの検知圧力を監視し、その検知圧力が
設定値以上の場合に上記能力固定圧縮機が運転を続けて
いると判断し上記室外ファンを運転する手段とを備え
る。An air conditioner according to a second aspect is a variable capacity compressor.
Operation by opening and closing the electromagnetic contactor connected to the commercial power supply
A plurality of compressors consisting of fixed compressors ,
An outdoor heat exchanger, a pressure reducer, a refrigeration cycle that connects a plurality of indoor heat exchangers, and a pressure sensor for detecting a high side pressure and the low side pressure of the refrigeration cycle, respectively, the upper Symbol chamber
An outdoor fan that circulates outside air to the outside heat exchanger,
Depending on the total air conditioning load of the indoor heat exchangers,
Means for controlling the number and capacity of compressors
When the operation of all the compressors is stopped by the control means
Monitor the pressure detected by the pressure sensor
If the value exceeds the set value, the fixed capacity compressor continues to operate.
Means for operating the outdoor fan when the outdoor fan is determined to be present .
【００１０】[0010]
【００１１】[0011]
【作用】請求項１の空気調和機では、冷凍サイクルの高
圧側圧力および低圧側圧力を検知して圧縮機の圧縮比を
求めるとともに、圧縮機から吐出される冷媒の温度を検
知し、圧縮比が設定値以上でかつ検知温度が設定値以上
のとき、圧縮機の運転台数あるいは能力を低減するとと
もに、圧縮比が設定値以下の状態で高圧側圧力が所定値
以下に下がったとき、圧縮機の運転台数あるいは能力を
増大する。In the air conditioner of the first aspect, the compression ratio of the compressor is determined by detecting the high pressure side and the low pressure side pressure of the refrigeration cycle, and the temperature of the refrigerant discharged from the compressor is detected. when is and detected temperature equal to or greater than a set value is larger than a predetermined value, the reducing operation number or capacity of the compressor bets
When the compression ratio is lower than the set value, the high pressure
When the number falls below,
Increase .
【００１２】請求項２の空気調和機は、運転停止時に冷
凍サイクルの高圧側圧力を検知し、その検知圧力が設定
値以上の場合に能力固定圧縮機が運転を続けていると判
断し室外ファンを運転する。In the air conditioner of the second aspect , when the operation is stopped, the high-pressure side pressure of the refrigeration cycle is detected, and when the detected pressure is equal to or higher than a set value, it is determined that the fixed capacity compressor is operating.
Turn off the outdoor fan.
【００１３】[0013]
【実施例】以下、この発明の第１実施例について図面を
参照して説明する。この大一実施例は、請求項１の空気
調和機に相当する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. This first embodiment corresponds to the air conditioner of the first aspect.
【００１４】図１において、Ａは１台の室外ユニット
で、この室外ユニットＡに分配ユニットＢを介して複数
台の室内ユニットＣ１，Ｃ２，Ｃ３を配管接続してい
る。室外ユニットＡは、２つの圧縮機を１つのケース内
に収めたタイプの圧縮機１、および同じく２つの圧縮機
を１つのケース内に収めたタイプの圧縮機２を備える。 In FIG. 1, A is an outdoor unit, and a plurality of indoor units C 1 , C 2 , and C 3 are connected to the outdoor unit A via a distribution unit B by piping. The outdoor unit A has two compressors in one case.
Compressor 1 and two compressors
Is provided in a single case.
【００１５】すなわち、圧縮機１は、インバータ駆動の
能力可変圧縮機３、および商用電源駆動の能力固定圧縮
機４を有する。圧縮機２は、インバータ駆動の能力可変
圧縮機５、および商用電源駆動の能力固定圧縮機６を有
する。これら圧縮機３，４，５，６の種類としては、ス
クロール型を用いている。圧縮機３，４，５，６の冷媒
吐出口に、それぞれ逆止弁７を順方向に介し、さらに四
方弁８を介し、室外熱交換器９を接続する。That is, the compressor 1 has a variable capacity compressor 3 driven by an inverter and a fixed capacity compressor 4 driven by a commercial power supply. The compressor 2 includes a variable capacity compressor 5 driven by an inverter and a fixed capacity compressor 6 driven by a commercial power supply. As the types of the compressors 3, 4, 5, and 6, a scroll type is used. An outdoor heat exchanger 9 is connected to a refrigerant discharge port of each of the compressors 3, 4, 5, and 6 via a check valve 7 in a forward direction and further via a four-way valve 8.
【００１６】室外熱交換器９に冷房サイクル形成用の逆
止弁１０および受液器１１を介してヘッダＨを接続す
る。このヘッダＨから室外熱交換器９にかけて、暖房用
の膨張弁１２を接続する。A header H is connected to the outdoor heat exchanger 9 via a check valve 10 for forming a cooling cycle and a liquid receiver 11. An expansion valve 12 for heating is connected from the header H to the outdoor heat exchanger 9.
【００１７】ヘッダＨに、電動式の流量調整弁（パルス
モータバルブ；以下、ＰＭＶと略称する）２１，３１，
４１、および冷房用の膨張弁２２，３２，４２と暖房サ
イクル形成用の逆止弁２３，３３，４３の並列体を介
し、室内熱交換器２４，３４，４４を接続する。室内熱
交換器２４，３４，４４にヘッダＨを接続し、そのヘッ
ダＨをアキュ―ムレ―タ１３を介して圧縮機３，４，
５，６の冷媒吸込口に接続する。こうして、室外ユニッ
トＡ、分配ユニットＢ、および室内ユニットＣ1 ，
Ｃ2，Ｃ3 において、ヒートポンプ式冷凍サイクルを構
成している。In the header H, electric flow control valves (pulse motor valves; hereinafter abbreviated as PMV) 21, 31,
41, and the indoor heat exchangers 24, 34, 44 are connected via parallel bodies of cooling expansion valves 22, 32, 42 and heating cycle forming check valves 23, 33, 43. The header H is connected to the indoor heat exchangers 24, 34, 44, and the header H is connected to the compressors 3, 4, 4 via the accumulator 13.
Connect to refrigerant inlets 5 and 6. Thus, the outdoor unit A, the distribution unit B, and the indoor unit C 1 ,
C 2 and C 3 constitute a heat pump refrigeration cycle.
【００１８】すなわち、冷房運転時は図示実線矢印の方
向に冷媒を流して冷房サイクルを形成し、暖房運転時は
四方弁８の切換作動により図示破線矢印の方向に冷媒を
流して暖房サイクルを形成する。この冷凍サイクルにお
いて、室外熱交換器９の近傍に室外ファン１４を設け
る。この室外ファン１４は、外気を室外熱交換器９に循
環させるものである。各逆止弁７から四方弁８にかけて
の高圧側配管に、圧力センサ１５を取付ける。この圧力
センサ１５は、高圧側圧力Ｐｄを検知する。That is, during the cooling operation, the refrigerant flows in the direction of the solid line in the drawing to form a cooling cycle, and in the heating operation, the switching operation of the four-way valve 8 causes the refrigerant to flow in the direction of the broken line in the drawing to form the heating cycle. I do. In this refrigeration cycle, an outdoor fan 14 is provided near the outdoor heat exchanger 9. The outdoor fan 14 circulates outside air to the outdoor heat exchanger 9. A pressure sensor 15 is attached to the high pressure side pipe from each check valve 7 to the four-way valve 8. This pressure sensor 15 detects the high pressure side pressure Pd.
【００１９】アキュームレータ１３から圧縮機３，４，
５，６の冷媒吸込口にかけての低圧側配管に、圧力セン
サ１６を取付ける。この圧力センサ１６は、低圧側圧力
Ｐｓを検知する。圧縮機３，４，５，６の冷媒吐出口か
ら各逆止弁７にかけての配管に、それぞれ温度センサ１
７を取付ける。From the accumulator 13 to the compressors 3, 4,
The pressure sensor 16 is attached to the low pressure side pipe extending to the refrigerant suction ports 5 and 6. The pressure sensor 16 detects the low pressure side pressure Ps. Temperature sensors 1 are connected to pipes from the refrigerant discharge ports of the compressors 3, 4, 5, and 6 to the check valves 7, respectively.
7 is installed.
【００２０】上記冷房用膨張弁２２，３２，４２はそれ
ぞれ感温筒２２ａ，３２ａ，４２ａを有しており、これ
ら感温筒を室内熱交換器２４，３４，４４のガス側冷媒
配管にそれぞれ取付ける。制御回路を図２に示す。The cooling expansion valves 22, 32, and 42 have temperature-sensitive cylinders 22a, 32a, and 42a, respectively, and these temperature-sensitive cylinders are connected to the gas-side refrigerant pipes of the indoor heat exchangers 24, 34, and 44, respectively. Attach. The control circuit is shown in FIG.
【００２１】室外ユニットＡは室外制御部５０を備えて
いる。この室外制御部５０に分配ユニットＢの分配制御
部６０を接続し、その分配制御部６０に室内ユニットＣ
1 ，Ｃ2 ，Ｃ3 のそれぞれ室内制御部７０を接続する。The outdoor unit A has an outdoor control section 50. The distribution control unit 60 of the distribution unit B is connected to the outdoor control unit 50, and the distribution control unit 60 is connected to the indoor unit C.
1 , C 2 and C 3 are respectively connected to the indoor control units 70.
【００２２】室外制御部５０は、マイクロコンピュ―タ
およびその周辺回路からなる。この室外制御部５０に、
四方弁８、インバ―タ５１，５３、常開形の接点５２，
５４、室外ファンモータ１４Ｍ、圧力センサ１５，１
６、温度センサ１７，１７，１７，１７を接続する。The outdoor controller 50 comprises a microcomputer and its peripheral circuits. In this outdoor control unit 50,
Four-way valve 8, inverters 51 and 53, normally open contact 52,
54, outdoor fan motor 14M, pressure sensor 15, 1
6. The temperature sensors 17, 17, 17, 17 are connected.
【００２３】インバ―タ５１，５３は、商用交流電源５
７の電圧を整流し、それを室外制御部５０の指令に応じ
たスイッチングによって所定周波数の電圧に変換するも
のである。この出力を圧縮機モ―タ３Ｍ，５Ｍに駆動電
力として供給する。スイッチ５２，５４は、電磁接触器
の接点である。このスイッチ５２，５４をそれぞれ介し
て、商用交流電源５７に圧縮機モータ４Ｍ，６Ｍを接続
する。分配制御部６０は、マイクロコンピュ―タおよび
その周辺回路からなる。この分配制御部６０に、ＰＭＶ
２１，３１，４１を接続する。The inverters 51 and 53 include a commercial AC power supply 5
7 is rectified and converted into a voltage of a predetermined frequency by switching according to a command of the outdoor control unit 50. This output is supplied to the compressor motors 3M and 5M as drive power. Switches 52 and 54 are contacts of the electromagnetic contactor. The compressor motors 4M and 6M are connected to a commercial AC power supply 57 via the switches 52 and 54, respectively. The distribution control unit 60 comprises a microcomputer and its peripheral circuits. The distribution control unit 60 includes a PMV
21, 31, and 41 are connected.
【００２４】室内制御部７０は、マイクロコンピュ―タ
およびその周辺回路からなる。この室内制御部７０に、
リモートコントロール式の操作器（以下、リモコンと略
称する）７１、および室内温度センサ７２を接続する。
そして、室内制御部７０は、次の機能手段を備える。 （１）リモコン７１の操作に基づく運転開始指令，運転
モード設定指令，および運転停止指令を分配ユニットＢ
に送る手段。 （２）室内温度センサ７２の検知温度とリモコン７１で
の設定室内温度との差を空調負荷として求め、その空調
負荷データを分配ユニットＢに送る手段。 分配制御部６０は、次の機能手段を備える。 （１）室内ユニットＣ1 ，Ｃ2 ，Ｃ3 の空調負荷の総和
を求め、その総合空調負荷データを室外ユニットＡに送
る手段。 （２）室内ユニットＣ1 ，Ｃ2 ，Ｃ3 の空調負荷に応じ
てＰＭＶ２１，３１，４１の開度を制御する手段。 室外制御部５０は、次の機能手段を備える。The indoor controller 70 comprises a microcomputer and its peripheral circuits. In this indoor control unit 70,
A remote control type operation device (hereinafter, abbreviated as a remote control) 71 and an indoor temperature sensor 72 are connected.
And the indoor control part 70 is provided with the following functional means. (1) Distribution unit B transmits an operation start command, operation mode setting command, and operation stop command based on operation of remote controller 71
Means to send to. (2) Means for obtaining the difference between the detected temperature of the room temperature sensor 72 and the room temperature set by the remote controller 71 as an air conditioning load, and sending the air conditioning load data to the distribution unit B. The distribution control unit 60 includes the following functional units. (1) Means for calculating the sum of the air conditioning loads of the indoor units C 1 , C 2 , C 3 and transmitting the total air conditioning load data to the outdoor unit A. (2) Means for controlling the degree of opening of the PMVs 21, 31, 41 according to the air conditioning loads of the indoor units C 1 , C 2 , C 3 . The outdoor control unit 50 includes the following functional units.
【００２５】（１）空調負荷の総和に応じて圧縮機３，
４，５，６の運転台数および能力を制御する手段。この
場合、運転する圧縮機を内部メモリに記憶されている優
先運転順位の高い方から順に選定する。 （２）圧力センサ１５，１６の検知圧力Ｐｄ，Ｐｓから
圧縮機３，４，５，６の圧縮比ｎを求める手段。(1) Compressor 3, depending on the total air conditioning load
Means for controlling the number of vehicles and the capacity of 4, 5, and 6. In this case, the compressors to be operated are selected in descending order of the priority operation order stored in the internal memory. (2) Means for obtaining the compression ratio n of the compressors 3, 4, 5, and 6 from the detected pressures Pd and Ps of the pressure sensors 15 and 16.
【００２６】（３）圧縮比ｎが設定値ｎ1 以上で、かつ
各温度センサ１７の検知温度Ｔｄのうちいずれかが異常
上昇して設定値Ｔｄ1 以上のとき、圧縮機３，４，５，
６の能力を低減する手段。（４）圧縮比ｎが設定値たとえば“７”以下で、かつ高
圧側圧力Ｐｄが所定値Ｐ 1 以下に下がったとき、圧縮機
３，４，５，６の能力を増大する手段。 つぎに、上記の
構成において図３のフローチャートを参照しながら作用
を説明する。運転中、室内ユニットＣ1 ，Ｃ2 ，Ｃ3 の
空調負荷の総和に応じて圧縮機３，４，５，６の運転台
数および能力を制御する（ステップＳ１）。(3) When the compression ratio n is equal to or higher than the set value n 1 and one of the detected temperatures Td of the temperature sensors 17 is abnormally increased and is equal to or higher than the set value Td 1 , the compressors 3, 4, 5 ,
6 means to reduce the ability. (4) The compression ratio n is equal to or less than a set value, for example, “7” and is high.
When pressure side pressure Pd drops below the predetermined value P 1, the compressor
Means to increase the capacity of 3,4,5,6. Next, the operation of the above configuration will be described with reference to the flowchart of FIG. During operation, the number of operating units and the capacity of the compressors 3, 4, 5, and 6 are controlled according to the sum of the air conditioning loads of the indoor units C 1 , C 2 , and C 3 (step S1).
【００２７】たとえば、空調負荷の総和がほぼ半分で、
圧縮機３，４，５，６の優先運転順位が「１」「２」
「３」「４」であれば、圧縮機３，４を運転する。この
状態から空調負荷が増せば、次に圧縮機５を運転する。For example, the sum of the air conditioning loads is almost half,
Priority order of compressors 3, 4, 5, 6 is "1""2"
If "3" or "4", the compressors 3 and 4 are operated. If the air conditioning load increases from this state, the compressor 5 is operated next.
【００２８】なお、圧縮機３，５の運転に際しては、空
調負荷に応じてインバータ５１，５３の出力周波数Ｆを
それぞれ制御する。圧縮機４，６の運転に際しては、空
調負荷に応じてスイッチ５２，５４を開閉する。When the compressors 3 and 5 are operated, the output frequencies F of the inverters 51 and 53 are controlled according to the air conditioning load. When the compressors 4 and 6 are operated, the switches 52 and 54 are opened and closed according to the air conditioning load.
【００２９】室外制御部５０の内部タイマに基づくタイ
ムカウントｔを開始し（ステップＳ２）、そのタイムカ
ウントｔが設定値ｔ1 に達すると（ステップＳ３）、圧
力センサ１５の検知圧力Ｐｄ、圧力センサ１６の検知圧
力Ｐｓ、各温度センサ１７の検知温度Ｔｄを取込む（ス
テップＳ４）。検知圧力Ｐｄ，Ｐｓから圧縮機３，４，
５，６の圧縮比ｎを求める（ステップＳ５）。 ｎ＝（Ｐｄ＋１）／（Ｐｓ＋１）[0029] starts time count t based on the internal timer of the outdoor control unit 50 (step S2), and its time count t has reached the set value t 1 (step S3), and detects the pressure Pd of the pressure sensor 15, a pressure sensor The detected pressure Ps of 16 and the detected temperature Td of each temperature sensor 17 are taken in (step S4). From the detected pressures Pd and Ps, the compressors 3, 4,
A compression ratio n of 5 or 6 is obtained (step S5). n = (Pd + 1) / (Ps + 1)
【００３０】求めた圧縮比ｎと予め定めている設定値ｎ
1 とを比較するとともに（ステップＳ６）、各温度セン
サ１７の検知温度Ｔｄと予め定めている設定値Ｔ1 とを
比較する（ステップＳ７）。The determined compression ratio n and a predetermined set value n
With Compare 1 (step S6), and compares the set value T 1 that is predetermined and the detection temperature Td of the temperature sensor 17 (step S7).
【００３１】圧縮比ｎが設定値ｎ1 以上で、しかも各温
度センサ１７の検知温度Ｔｄのうちいずれかが異常上昇
して設定値Ｔｄ1 以上になると、圧縮機３，５の運転周
波数（インバータ５１，５３の出力周波数）Ｆを１ステ
ップαだけ低減する（ステップＳ８）。この低減をタイ
ムカウントｔに基づくｔ1 時間ごとに繰返す。When the compression ratio n is equal to or higher than the set value n 1 and one of the detected temperatures Td of the temperature sensors 17 abnormally rises and becomes equal to or higher than the set value Td 1 , the operating frequency of the compressors 3 and 5 (the inverter The output frequency (F, 51, 53) F is reduced by one step α (step S8). This reduction is repeated every t 1 hours based on the time count t.
【００３２】このように、圧縮比ｎが増大し、しかも吐
出冷媒温度Ｔｄが異常上昇した場合には、圧縮機の能力
を低減することにより、圧縮機の破損を未然に防ぐこと
ができる。次に、圧縮比ｎが設定値たとえば“７”以下
で、かつ高圧側圧力Ｐｄが所定値Ｐ 1 以下に下がったと
きの制御について、図４のフローチャートを参照しなが
ら説明する。運転中、係数ｍを先ず“１”に設定し（ス
テップＵ１）、圧力センサ１５の検知圧力Ｐｄおよび圧
力センサ１６の検知圧力Ｐｓを取込む（ステップＵ
２）。検知圧力Ｐｄ，Ｐｓから圧縮機３，４，５，６の
圧縮比ｎを求める（ステップＵ３）。As described above, when the compression ratio n increases and the discharge refrigerant temperature Td rises abnormally, damage to the compressor can be prevented by reducing the capacity of the compressor. Next, when the compression ratio n is less than a set value, for example, "7"
In, and a high side pressure Pd drops below the predetermined value P 1
Control will be described with reference to the flowchart of FIG. During operation, the coefficient m is first set to "1" (step U1), and the detected pressure Pd of the pressure sensor 15 and the detected pressure Ps of the pressure sensor 16 are taken in (step U1).
2). The compression ratio n of the compressors 3, 4, 5, and 6 is obtained from the detected pressures Pd and Ps (step U3).
【００３３】求めた圧縮比ｎと予め定めている設定値
“７”とを比較するとともに（ステップＵ４）、検知圧
力Ｐｄと予め定めている設定値Ｐ1 とを比較する（ステ
ップＵ５）。The obtained compression ratio n while comparing with a previously determined and set value "7" (step U4), and compares the set value P 1 that is predetermined and sensed pressure Pd (Step U5).
【００３４】圧縮比ｎが設定値“７”以下に下がり、し
かも検知圧力Ｐｄが設定値Ｐ1 に下がると、圧縮機３，
５の運転周波数Ｆを所定値αに係数ｍを乗算した値（ｍ
・α）だけ高める（ステップＵ６）。そして、係数ｍに
“１”をプラスし（ステップＵ７）、同じ制御を繰返
す。つまり、運転周波数Ｆの上昇幅を徐々に増していく
ことになる。ただし、運転周波数Ｆが許容最高周波数Ｆ
max に達したら（ステップＵ８）、ステップＵ１に移っ
て係数ｍを初期値“１”に戻す。The fall in the compression ratio n is set value "7" or less, yet the detected pressure Pd decreases the set value P 1, the compressor 3,
5 obtained by multiplying a predetermined value α by a coefficient m with the operating frequency F of 5 (m
Increase by α) (step U6). Then, "1" is added to the coefficient m (step U7), and the same control is repeated. That is, the increasing width of the operating frequency F is gradually increased. However, if the operating frequency F is the allowable maximum frequency F
When it reaches max (step U8), the process moves to step U1 to return the coefficient m to the initial value "1".
【００３５】なお、圧縮比ｎが設定値“７”以下に下が
っても、検知圧力Ｐｄが設定値Ｐ1よりも高い状態を維
持していれば（ステップＵ５のＮＯ）、係数が“１”で
あるかどうか判定する（ステップＵ９）。係数が“１”
ならば、つまり運転周波数Ｆの上昇制御にまだ入ってい
なければ、そのときの運転周波数Ｆをそのまま保持する
（ステップＵ10）。係数が“１”でなければ、つまり運
転周波数Ｆの上昇制御にすでに入っていれば、運転周波
数Ｆを所定値αだけ低減する（ステップＵ11）。[0035] Incidentally, the compression ratio n is lowered to the set value "7" or less, if maintaining the sensed pressure Pd is higher than the set value P 1 (NO at Step U5), the coefficient is "1" Is determined (step U9). Coefficient is "1"
If it is, that is, if the control for increasing the operating frequency F has not been started yet, the operating frequency F at that time is held as it is (step U10). If the coefficient is not "1", that is, if the increase control of the operating frequency F has already been started, the operating frequency F is reduced by a predetermined value α (step U11).
【００３６】このように、圧縮比ｎが下がり、しかも吐
出冷媒温度Ｔｄが下がった場合には、冷凍サイクルの配
管等で熱損失が生じているとの判断の下に圧縮機の能力
を増大することにより、その熱損失を補って十分な空調
能力を確保することができる。したがって、暖房運転時
に部屋の中がなかなか暖まらないなどの不具合を解消す
ることができる。この発明の第２実施例について説明す
る。この実施例は、請求項２の空気調和機に相当する。
ここでは、室外制御部５０の機能手段として、第１実施
例での（３）（４）に代わり次の（３）が設けられる。 （３）運転停止時に圧力センサ１５の検知圧力Ｐｄを監
視し、その検知圧力Ｐｄが設定値Ｐ2 以上の場合に室外
ファン１４を運転する手段。他の構成は第１実施例と同
じである。作用について図５のフローチャートを参照し
ながら説明する。As described above, when the compression ratio n decreases and the discharge refrigerant temperature Td decreases, the capacity of the compressor is increased based on the determination that heat loss has occurred in the piping of the refrigeration cycle or the like. This makes it possible to compensate for the heat loss and secure a sufficient air conditioning capacity. Therefore, it is possible to solve the problem that the inside of the room is not easily heated during the heating operation. A second embodiment of the present invention will be described. This embodiment corresponds to the air conditioner of the second aspect .
Here, as the functional means of the outdoor control unit 50 , the first embodiment
The following (3) is provided instead of (3) and (4) in the example. (3) monitoring the sensed pressure Pd of the pressure sensor 15 at the time of operation stop, means for driving the outdoor fan 14 when the detection pressure Pd is set value P 2 or more. Other configurations are the same as those of the first embodiment. The operation will be described with reference to the flowchart of FIG.
【００３７】運転停止時（ステップＷ１のＹＥＳ）、圧
力センサ１５の検知圧力Ｐｄを取り込み（ステップＷ
２）、その検知圧力Ｐｄと設定値Ｐ2 とを比較する（ス
テップＷ３）。この比較において、検知圧力Ｐｄが設定
値Ｐ2 よりも高ければ、室外ファン１４の運転を開始す
る（ステップＷ４）。When the operation is stopped (YES in step W1), the detected pressure Pd of the pressure sensor 15 is taken in (step W1).
2), it is compared with the set value P 2 and the detection pressure Pd (step W3). In this comparison, the sensed pressure Pd is higher than the set value P 2, which starts the operation of the outdoor fan 14 (step W4).
【００３８】このように、運転停止であるにもかかわら
ず高圧側圧力Ｐｄが高くなった場合には、接触器接点で
あるスイッチ５２，５４の接点溶着等によって圧縮機
４，６のいずれかが運転を続けているとの判断の下に、
室外ファン１４を運転することにより、高圧側圧力Ｐｄ
の上昇を抑制することができる。したがって、圧縮機
３，４，５，６を初めとする冷凍サイクル機器の破損を
回避することができ、安全性である。As described above, when the high-pressure side pressure Pd becomes high despite the stoppage of operation, one of the compressors 4 and 6 is caused by welding of the contacts of the switches 52 and 54 which are the contactor contacts. Based on the judgment that you are driving,
By operating the outdoor fan 14, the high pressure side pressure Pd
Can be suppressed. Therefore, damage to the refrigeration cycle equipment including the compressors 3, 4, 5, and 6 can be avoided, and safety is achieved.
【００３９】[0039]
【発明の効果】以上述べたようにこの発明によれば、As described above, according to the present invention,
【００４０】請求項１の空気調和機は、圧縮機の圧縮比
が高くなっても、それによる圧縮機の破損を未然に防ぐ
ことができ、しかも配管などでの熱損失を補って十分な
空調能力を確保できる。The air conditioner of claim 1, even higher compression ratio of the compressor can be prevented damage to the compressor due to it, yet sufficient to compensate for the heat loss of the piping, etc.
Air conditioning capacity can be secured .
【００４１】[0041]
【００４２】請求項２の空気調和機は、圧縮機の不要な
運転継続に際して圧縮機を始めとする冷凍サイクル機器
の安全を確保できる。The air conditioner of claim 2 can ensure the safety of the refrigeration cycle device including the compressor when unnecessary continuous operation of the compressor.
【図１】この発明の第１実施例、第２実施例、および第
３実施例の冷凍サイクルの構成を示す図。FIG. 1 is a diagram showing a configuration of a refrigeration cycle according to a first embodiment, a second embodiment, and a third embodiment of the present invention.
【図２】各実施例の制御回路の構成を示すブロック図。FIG. 2 is a block diagram showing a configuration of a control circuit of each embodiment.
【図３】第１実施例の作用を説明するためのフローチャ
ート。FIG. 3 is a flowchart for explaining the operation of the first embodiment.
【図４】第２実施例の作用を説明するためのフローチャ
ート。FIG. 4 is a flowchart for explaining the operation of the second embodiment.
【図５】第３実施例の作用を説明するためのフローチャ
ート。FIG. 5 is a flowchart for explaining the operation of the third embodiment.
Ａ…室外ユニット、Ｂ…分配ユニット、Ｃ1 ，Ｃ2 ，Ｃ
3 …室内ユニット、３，４，５，６…圧縮機、１５，１
６…圧力センサ、１７…温度センサ、５０…室外制御
部、６０…分配制御部、７０…室内制御部。A: outdoor unit, B: distribution unit, C 1 , C 2 , C
3 ... indoor unit, 3, 4, 5, 6 ... compressor, 15, 1
6 pressure sensor, 17 temperature sensor, 50 outdoor control unit, 60 distribution control unit, 70 indoor control unit.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−143461（ＪＰ，Ａ) 実開 平２−4166（ＪＰ，Ｕ) 実開 昭50−68956（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F25B 1/00 F25B 13/00 104 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-143461 (JP, A) Japanese Utility Model Application 2-4166 (JP, U) Japanese Utility Model Application 50-68956 (JP, U) (58) Survey Field (Int. Cl. 7 , DB name) F25B 1/00 F25B 13/00 104
Claims (2)
らなる複数台の圧縮機、室外熱交換器、減圧器、複数台
の室内熱交換器を接続した冷凍サイクルと、この冷凍サ
イクルの高圧側圧力および低圧側圧力をそれぞれ検知す
る圧力センサと、前記複数台の室内熱交換器の空調負荷
の総和に応じて前記複数台の圧縮機の運転台数および能
力を制御する手段と、前記複数台の各圧縮機から吐出さ
れる冷媒の温度を検知する複数の温度センサと、前記各
圧力センサの検知圧力から前記圧縮機の圧縮比を求める
手段と、この圧縮比が設定値以上でかつ前記複数の温度
センサのいずれかの検知温度が設定値以上のとき、前記
複数台の圧縮機の運転台数あるいは能力を低減する手段
と、前記圧縮比が設定値以下でかつ前記高圧側圧力が所
定値以下に下がったとき、前記複数台の圧縮機の運転台
数あるいは能力を増大する手段とを具備したことを特徴
とする空気調和機。1. A variable capacity compressor and a fixed capacity compressor.
Ranaru plurality of compressors, the outdoor heat exchanger, a pressure reducer, a plurality
Refrigeration cycle to which the indoor heat exchangers are connected, pressure sensors for detecting the high pressure side and the low pressure side pressure of the refrigeration cycle, respectively , and the air conditioning load of the plurality of indoor heat exchangers
The number and operating capacity of the plurality of compressors according to the sum of
Means for controlling the force, a plurality of temperature sensors for detecting the temperature of the refrigerant discharged from each of the plurality of compressors, a means for determining the compression ratio of the compressor from the detected pressure of each pressure sensor, when any of the detection temperature of the compression ratio is higher than the set value and the plurality of temperature sensors is equal to or greater than a preset value, the
Means for reducing the number or capacity of operating multiple compressors
The compression ratio is below a set value and the high pressure side pressure is
When the pressure drops below a fixed value, the cab of the plurality of compressors
Means for increasing the number or capacity of the air conditioner.
れた電磁接触器の開閉により運転停止される能力固定圧
縮機からなる複数台の圧縮機、室外熱交換器、減圧器、
複数台の室内熱交換器を接続した冷凍サイクルと、この
冷凍サイクルの高圧側圧力および低圧側圧力をそれぞれ
検知する圧力センサと、前記室外熱交換器に外気を循環
させる室外ファンと、前記複数台の室内熱交換器の空調
負荷の総和に応じて前記複数台の圧縮機の運転台数およ
び能力を制御する手段と、この制御手段により前記複数
台の全ての圧縮機の運転停止時に前記圧力センサの検知
圧力を監視し、その検知圧力が設定値以上の場合に前記
能力固定圧縮機が運転を続けていると判断し前記室外フ
ァンを運転する手段とを具備したことを特徴とする空気
調和機。2. A compressor connected to a variable capacity compressor and a commercial power supply.
Ability to stop operation due to opening and closing of a closed electromagnetic contactor Fixed pressure
Multiple compressors consisting of compressors, outdoor heat exchangers, decompressors,
A refrigeration cycle to which a plurality of indoor heat exchangers are connected, pressure sensors for detecting high-pressure side and low-pressure side pressure of the refrigeration cycle, respectively , and circulating outside air to the outdoor heat exchanger
Outdoor fan and air conditioning of the plurality of indoor heat exchangers
The number of operating compressors and the number of compressors according to the total load
Means for controlling the power and capacity, and the control means
The pressure sensor detects when all compressors are stopped.
Monitor the pressure, and if the detected pressure is higher than the set value,
Judging that the fixed capacity compressor is continuing to operate,
Means for operating the fan .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16451091A JP3163115B2 (en) | 1991-07-04 | 1991-07-04 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16451091A JP3163115B2 (en) | 1991-07-04 | 1991-07-04 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0510608A JPH0510608A (en) | 1993-01-19 |
| JP3163115B2 true JP3163115B2 (en) | 2001-05-08 |
Family
ID=15794533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16451091A Expired - Fee Related JP3163115B2 (en) | 1991-07-04 | 1991-07-04 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3163115B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4767134B2 (en) * | 2006-09-01 | 2011-09-07 | 三洋電機株式会社 | Refrigeration equipment |
| JP5789535B2 (en) * | 2012-02-09 | 2015-10-07 | 日立アプライアンス株式会社 | Heat pump water heater |
-
1991
- 1991-07-04 JP JP16451091A patent/JP3163115B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0510608A (en) | 1993-01-19 |
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