JP3420652B2 - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JP3420652B2 JP3420652B2 JP05128395A JP5128395A JP3420652B2 JP 3420652 B2 JP3420652 B2 JP 3420652B2 JP 05128395 A JP05128395 A JP 05128395A JP 5128395 A JP5128395 A JP 5128395A JP 3420652 B2 JP3420652 B2 JP 3420652B2
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- indoor
- heat exchanger
- outdoor
- blower
- 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
-
- 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
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Air Conditioning Control Device (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、圧縮機への通電を接
点の開閉により制御する電磁接触器を備えた空気調和機
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner equipped with an electromagnetic contactor for controlling energization of a compressor by opening and closing contacts.
【０００２】[0002]
【従来の技術】圧縮機、四方弁、室外熱交換器、減圧器
たとえば電動膨張弁、および室内熱交換器を順次に配管
接続してヒートポンプ式の冷凍サイクルを構成した空気
調和機がある。冷房運転では、圧縮機の吐出冷媒を四方
弁から室外熱交換器、電動膨張弁、室内熱交換器へと流
し、室外熱交換器を凝縮器、室内熱交換器を蒸発器とし
て機能させる。暖房運転では、圧縮機の吐出冷媒を四方
弁から室内熱交換器、電動膨張弁、室外熱交換器へと流
し、室内熱交換器を凝縮器、室外熱交換器を蒸発器とし
て機能させる。2. Description of the Related Art There is an air conditioner in which a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer such as an electric expansion valve, and an indoor heat exchanger are sequentially connected by piping to form a heat pump type refrigeration cycle. In the cooling operation, the refrigerant discharged from the compressor is caused to flow from the four-way valve to the outdoor heat exchanger, the electric expansion valve, and the indoor heat exchanger, and the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator. In the heating operation, the refrigerant discharged from the compressor is caused to flow from the four-way valve to the indoor heat exchanger, the electric expansion valve, and the outdoor heat exchanger, and the indoor heat exchanger functions as a condenser and the outdoor heat exchanger functions as an evaporator.
【０００３】運転中は室内温度を検知し、その検知温度
と設定室内温度との対比により圧縮機の運転を制御す
る。この運転制御用として電磁接触器を用いることが多
い。すなわち、圧縮機モータを電磁接触器の接点を介し
て電源に接続しており、電磁接触器を付勢してその接点
を閉じることにより、圧縮機の運転を開始する。電磁接
触器を消勢してその接点を開くことにより、圧縮機の運
転を停止する。During operation, the room temperature is detected, and the operation of the compressor is controlled by comparing the detected temperature with the set room temperature. An electromagnetic contactor is often used for this operation control. That is, the compressor motor is connected to the power source through the contact of the electromagnetic contactor, and the operation of the compressor is started by energizing the electromagnetic contactor and closing the contact. The compressor operation is stopped by deactivating the electromagnetic contactor and opening its contacts.
【０００４】また、熱交換器における冷媒の過熱度ある
いは過冷却度が最適な値となるよう、電動膨張弁の開度
を調節するようにしている。複数の室内熱交換器を有す
るマルチタイプの空気調和機では、運転停止の室内熱交
換器に対応する電動膨張弁の開度を絞ったりあるいは全
閉し、同室内熱交換器への冷媒の流通を制限したり遮断
するようにしている。Further, the opening degree of the electric expansion valve is adjusted so that the degree of superheat or the degree of subcooling of the refrigerant in the heat exchanger has an optimum value. In a multi-type air conditioner with multiple indoor heat exchangers, the opening of the electric expansion valve corresponding to the indoor heat exchanger that is not operating can be reduced or fully closed to distribute the refrigerant to the indoor heat exchanger. I try to limit or block it.
【０００５】[0005]
【発明が解決しようとする課題】圧縮機の運転停止は電
磁接触器の消勢によってなされるが、消勢したにもかか
わらず接触器接点が溶着して開かないことがある。この
場合、圧縮機の運転が停止できないまま不要に続くこと
になり、電動膨張弁が絞られたり全閉されていると、冷
凍サイクルの高圧側圧力が異常上昇して熱交換器や配管
などの冷凍サイクル部品の寿命に悪影響を与え、また圧
縮機が真空運転となって圧縮機モータの巻線が焼損に至
る心配がある。The operation of the compressor is stopped by deenergizing the electromagnetic contactor. However, even if the compressor is deenergized, the contactor contact may be welded and may not open. In this case, the operation of the compressor cannot be stopped and continues unnecessarily.If the electric expansion valve is throttled or fully closed, the pressure on the high-pressure side of the refrigeration cycle rises abnormally, causing heat exchangers, piping, etc. There is a risk that the life of the refrigeration cycle parts will be adversely affected, and that the compressor will be in vacuum operation and the windings of the compressor motor will be burned out.
【０００６】この発明は上記の事情を考慮したもので、
その目的とするところは、電磁接触器の接点が溶着した
場合でも圧縮機をはじめとする冷凍サイクル部品の安全
を十分に確保し得る空気調和機を提供することにある。The present invention takes the above circumstances into consideration,
It is an object of the present invention to provide an air conditioner that can sufficiently secure the safety of refrigeration cycle parts such as a compressor even when the contacts of an electromagnetic contactor are welded.
【０００７】[0007]
【課題を解決するための手段】第１の発明の空気調和機
は、圧縮機、四方弁、室外熱交換器、電動膨張弁、室内
熱交換器を順次接続した冷凍サイクルと、室外送風機
と、室内送風機と、圧縮機への通電を接点の開閉により
制御する電磁接触器と、この電磁接触器で圧縮機の運転
を制御し且つ電動膨張弁の開度、室外送風機の運転、室
内送風機の運転を制御する制御装置とを備えたものであ
って、とくに制御装置が、電磁接触器の接点溶着を検出
する溶着検出手段と、圧縮機の運転停止が必要なときに
上記溶着検出手段が接点溶着を検出すると電動膨張弁を
所定の開度状態に保持する保護手段とを備えている。The air conditioner of the first invention comprises a refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, an electric expansion valve, and an indoor heat exchanger are sequentially connected, and an outdoor blower. An indoor blower and an electromagnetic contactor that controls the energization of the compressor by opening and closing the contacts, and this electromagnetic contactor controls the operation of the compressor and the opening of the electric expansion valve, the operation of the outdoor blower, and the operation of the indoor blower. In particular, the control device includes a welding detection means for detecting the contact welding of the electromagnetic contactor, and the welding detection means for contact welding when it is necessary to stop the operation of the compressor. When the electric expansion valve is detected
And a protection means for maintaining a predetermined opening state .
【０００８】第２の発明の空気調和機は、圧縮機、四方
弁、室外熱交換器、電動膨張弁、室内熱交換器を順次接
続した冷凍サイクルと、室外送風機と、室内送風機と、
圧縮機への通電を接点の開閉により制御する電磁接触器
と、この電磁接触器で圧縮機の運転を制御し且つ電動膨
張弁の開度、室外送風機の運転、室内送風機の運転を制
御する制御装置とを備えたものであって、とくに制御装
置が、冷凍サイクルの高圧側圧力を検知する圧力検知手
段と、電磁接触器の接点溶着を検出する溶着検出手段
と、圧縮機の運転停止が必要なときに上記溶着検出手段
が接点溶着を検出すると室外送風機を継続して運転し、
この室外送風機の運転にもかかわらず上記圧力検知手段
の検知圧力が所定値以上となってその状態が一定時間継
続したときに四方弁を反転させる保護手段とを備えてい
る。 The air conditioner of the second invention is a compressor, four-way
Valve, outdoor heat exchanger, electric expansion valve, indoor heat exchanger
A continuous refrigeration cycle, an outdoor blower, an indoor blower,
An electromagnetic contactor that controls the energization of the compressor by opening and closing the contacts.
This electromagnetic contactor controls the operation of the compressor and
Controls the opening of the tension valve, the operation of the outdoor blower, and the operation of the indoor blower.
And a control device for controlling
Is a pressure detector that detects the pressure on the high pressure side of the refrigeration cycle.
And welding detection means for detecting contact welding of the electromagnetic contactor
And the welding detection means when it is necessary to stop the operation of the compressor.
When the contact welding is detected, the outdoor blower is continuously operated,
Despite the operation of this outdoor blower, the above pressure detection means
When the pressure detected by the
Equipped with protective means to reverse the four-way valve when continued
It
【０００９】第３の発明の空気調和機は、複数の圧縮
機、四方弁、室外熱交換器、電動膨張弁、並列状態の複
数の室内熱交換器を順次接続して冷媒を循環させる冷凍
サイクルと、室外送風機と、複数の室内送風機と、各圧
縮機への通電を接点の開閉により制御する複数の電磁接
触器と、これら電磁接触器で各圧縮機の運転を制御し且
つ電動膨張弁の開度、室外送風機の運転、各室内送風機
の運転を制御する制御装置とを備えたものであって、と
くに制御装置が、各電磁接触器の接点溶着を検出する溶
着検出手段と、各圧縮機のいずれかの運転停止が必要な
ときに同圧縮機に対応する電磁接触器の接点溶着を上記
溶着検出手段が検出すると同圧縮機の運転容量に応じた
冷媒循環量が確保できるよう各室内熱交換器への冷媒の
流通を制御する保護手段と、室内温度を検知する温度検
知手段と、この温度検知手段の検知温度と設定室内温度
との差が所定値以上超えたときに上記四方弁を反転させ
る手段とを備えている。 The air conditioner of the third invention comprises a plurality of compressors.
Machine, four-way valve, outdoor heat exchanger, electric expansion valve, parallel
Refrigeration in which several indoor heat exchangers are connected in sequence to circulate a refrigerant
Cycle, outdoor blower, multiple indoor blowers, each pressure
Multiple electromagnetic contacts that control the energization of the compressor by opening and closing the contacts
The operation of each compressor is controlled by the contactor and these electromagnetic contactors.
Opening of two electric expansion valves, operation of outdoor blowers, indoor blowers
And a control device for controlling the operation of
The Kuni Control Unit detects the contact welding of each electromagnetic contactor.
It is necessary to stop the operation of either the landing detection means or each compressor.
Sometimes the contact welding of the electromagnetic contactor corresponding to the compressor is mentioned above.
According to the operating capacity of the compressor, when the welding detection means detects
Refrigerant to each indoor heat exchanger to ensure the amount of refrigerant circulation
Protective measures to control distribution and temperature detection to detect indoor temperature
Knowing means, detection temperature of this temperature detecting means and set room temperature
When the difference between the
And means for
【００１０】[0010]
【００１１】[0011]
【００１２】[0012]
【００１３】[0013]
【作用】第１の発明の空気調和機では、圧縮機の運転停
止が必要なときに電磁接触器の接点溶着を検出すると、
電動膨張弁を所定の開度状態に保持する。 In the air conditioner of the first invention, when the contact welding of the electromagnetic contactor is detected when it is necessary to stop the operation of the compressor,
The electric expansion valve is maintained at a predetermined opening state.
【００１４】第２の発明の空気調和機では、圧縮機の運
転停止が必要なときに電磁接触器の接点溶着を検出する
と、室外送風機を継続して運転し、この室外送風機の運
転にもかかわらず高圧側圧力が所定値以上となってその
状態が一定時間継続したときに四方弁を反転させる。In the air conditioner of the second invention, the operation of the compressor is
Detects contact welding of electromagnetic contactor when rolling stop is required
Then, the outdoor blower is continuously operated, and the four-way valve is reversed when the high pressure side pressure becomes equal to or higher than a predetermined value and the state continues for a certain period of time despite the operation of the outdoor blower.
【００１５】第３の発明の空気調和機では、各圧縮機の
いずれかの運転停止が必要なときに同圧縮機に対応する
電磁接触器の接点溶着を検出すると、同圧縮機の運転容
量に応じた冷媒循環量が確保できるよう各室内熱交換器
への冷媒の流通を制御する。さらに、室内温度と設定室
内温度との差が所定値以上超えたとき、四方弁を反転さ
せる。 In the air conditioner of the third invention, each of the compressors
Responding to the same compressor when either shutdown is required
When contact welding of the electromagnetic contactor is detected, the operating capacity of the compressor will be
Each indoor heat exchanger so that the refrigerant circulation amount according to the amount can be secured
Controls the flow of refrigerant to and from. In addition, the room temperature and setting room
When the difference from the internal temperature exceeds the specified value, the four-way valve is inverted.
Let
【００１６】[0016]
【００１７】[0017]
【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。図２に示すように、室外ユニットＡ
は、インバータ駆動の能力可変圧縮機１および商用電源
駆動の能力固定圧縮機２を有している。この圧縮機１，
２の吐出口に高圧側配管３を接続し、圧縮機１，２の吸
込口に低圧側配管４を接続する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 2, the outdoor unit A
Has a variable capacity compressor 1 driven by an inverter and a fixed capacity compressor 2 driven by a commercial power source. This compressor 1,
The high pressure side pipe 3 is connected to the discharge port 2 and the low pressure side pipe 4 is connected to the suction ports of the compressors 1 and 2.
【００１８】高圧側配管３に四方弁５を介して室外熱交
換器６を接続し、その室外熱交換器６に逆止弁８および
暖房用膨張弁９を介してリキッドタンク１０を接続す
る。このリキッドタンク１０の先は液側配管Ｗとなる。An outdoor heat exchanger 6 is connected to the high-pressure side pipe 3 via a four-way valve 5, and a liquid tank 10 is connected to the outdoor heat exchanger 6 via a check valve 8 and a heating expansion valve 9. The end of the liquid tank 10 is the liquid side pipe W.
【００１９】低圧側配管４はアキュームレータ１１およ
び上記四方弁５を介してガス側配管Ｇにつながる。これ
ら液側配管Ｗとガス側配管Ｇとの間に、複数の室内ユニ
ットＢを互いに並列の関係に接続する。The low pressure side pipe 4 is connected to the gas side pipe G through the accumulator 11 and the four-way valve 5. A plurality of indoor units B are connected in parallel to each other between the liquid side pipe W and the gas side pipe G.
【００２０】各室内ユニットＢは電動膨張弁２１および
室内熱交換器２２を有しており、室内熱交換器２２の一
端側を電動膨張弁２１を介して液側配管Ｗに接続し、室
内熱交換器２２の他端側をガス側配管Ｇに接続する。電
動膨張弁２１は、入力される駆動パルスの数に応じて開
度が連続的に変化するパルスモータバルブ（ＰＭＶ）で
ある。Each indoor unit B has an electric expansion valve 21 and an indoor heat exchanger 22, and one end side of the indoor heat exchanger 22 is connected to the liquid side pipe W via the electric expansion valve 21 so that the indoor heat The other end of the exchanger 22 is connected to the gas side pipe G. The electric expansion valve 21 is a pulse motor valve (PMV) whose opening continuously changes according to the number of input drive pulses.
【００２１】このような配管接続により、室外ユニット
Ａおよび各室内ユニットＢにおいてヒートポンプ式の冷
凍サイクルを構成している。冷房時は、四方弁５を非作
動状態に設定し、これにより圧縮機１，２の吐出冷媒を
図示実線矢印の方向に流して冷房サイクルを形成し、室
外熱交換器６を凝縮器、各室内熱交換器２２を蒸発器と
して機能させる。暖房時は、四方弁５を切換え作動し、
これにより圧縮機１，２の吐出冷媒を図示破線矢印の方
向に冷媒を流して暖房サイクルを形成し、各室内熱交換
器２２を凝縮器、室外熱交換器６を蒸発器として機能さ
せる。By such pipe connection, the outdoor unit A and each indoor unit B constitute a heat pump type refrigeration cycle. At the time of cooling, the four-way valve 5 is set to a non-operating state, whereby the refrigerant discharged from the compressors 1 and 2 is caused to flow in the direction of the solid arrow to form a cooling cycle, and the outdoor heat exchanger 6 is connected to the condenser, The indoor heat exchanger 22 functions as an evaporator. During heating, the four-way valve 5 is switched and operated,
As a result, the refrigerant discharged from the compressors 1 and 2 is caused to flow in the direction of the broken line arrow to form a heating cycle, and each indoor heat exchanger 22 functions as a condenser and the outdoor heat exchanger 6 functions as an evaporator.
【００２２】また、室外ユニットＡでは、室外熱交換器
６の近傍に室外送風機７を設ける。圧縮機１側の高圧側
配管３に、冷媒温度センサ１２および冷媒圧力センサ１
３を取付ける。圧縮機２側の高圧側配管３に、冷媒温度
センサ１４および冷媒圧力センサ１５を取付ける。低圧
側配管４に、冷媒圧力センサ１６を取付ける。両高圧側
配管３の接続部に高圧スイッチ１７を取付ける。この高
圧スイッチ１７は、高圧側圧力が異常上昇して所定値に
達すると作動し、その後、高圧側圧力が所定値より低い
ところまで低下すると復帰する。室外熱交換器６に、熱
交換器温度センサ１８を取付ける。In the outdoor unit A, an outdoor blower 7 is provided near the outdoor heat exchanger 6. The refrigerant temperature sensor 12 and the refrigerant pressure sensor 1 are connected to the high pressure side pipe 3 on the side of the compressor 1.
Install 3. The refrigerant temperature sensor 14 and the refrigerant pressure sensor 15 are attached to the high pressure side pipe 3 on the compressor 2 side. A refrigerant pressure sensor 16 is attached to the low pressure side pipe 4. A high pressure switch 17 is attached to the connection portion of both high pressure side pipes 3. The high-pressure switch 17 operates when the high-pressure side pressure abnormally rises and reaches a predetermined value, and then returns when the high-pressure side pressure falls below a predetermined value. The heat exchanger temperature sensor 18 is attached to the outdoor heat exchanger 6.
【００２３】各室内ユニットＢでは、室内熱交換器２２
の近傍に室内送風機２３および室内温度センサ２４を設
ける。室内熱交換器２２の一端側の液側配管に、冷媒温
度センサ２５を取付ける。室内熱交換器２２の他端側の
ガス側配管に、冷媒温度センサ２６および冷媒圧力セン
サ２７を取付ける。In each indoor unit B, the indoor heat exchanger 22
An indoor blower 23 and an indoor temperature sensor 24 are provided in the vicinity of. The refrigerant temperature sensor 25 is attached to the liquid side pipe on one end side of the indoor heat exchanger 22. A refrigerant temperature sensor 26 and a refrigerant pressure sensor 27 are attached to the gas side pipe on the other end side of the indoor heat exchanger 22.
【００２４】制御装置を図１に示す。商用交流電源３０
に室外ユニットＡの室外制御部４０を接続し、その室外
制御部４０に各室内ユニットＢの室内制御部５０を渡り
線接続する。The control device is shown in FIG. Commercial AC power supply 30
The outdoor control unit 40 of the outdoor unit A is connected to, and the indoor control unit 50 of each indoor unit B is connected to the outdoor control unit 40 by a crossover connection.
【００２５】室外制御部４０に、四方弁５、送風用モー
タ７Ｍ、冷媒温度センサ１２，１４、熱交換器温度セン
サ１８、冷媒圧力センサ１３，１５，１６、高圧スイッ
チ１７、電磁接触器４１，４２、インバータ回路４３、
および電流センサ４４，４５を接続する。In the outdoor control section 40, the four-way valve 5, the blower motor 7M, the refrigerant temperature sensors 12, 14, the heat exchanger temperature sensor 18, the refrigerant pressure sensors 13, 15, 16, the high pressure switch 17, the electromagnetic contactor 41, 42, an inverter circuit 43,
And the current sensors 44 and 45 are connected.
【００２６】商用交流電源３０に上記電磁接触器４１の
接点（常開形）４１ａを介して上記インバータ回路４３
の入力端を接続し、インバータ回路４３の出力端に圧縮
機モータ１Ｍを接続する。インバ―タ回路４３は、電源
電圧を整流し、それを室外制御部４０の指令に応じたス
イッチングにより所定周波数（およびレベル）の電圧に
変換し、出力する。The inverter circuit 43 is connected to the commercial AC power source 30 via the contact (normally open type) 41a of the electromagnetic contactor 41.
Of the inverter circuit 43, and the compressor motor 1M is connected to the output terminal of the inverter circuit 43. The inverter circuit 43 rectifies the power supply voltage, converts it into a voltage of a predetermined frequency (and level) by switching according to a command from the outdoor control unit 40, and outputs the voltage.
【００２７】商用交流電源３０に上記電磁接触器４２の
接点（常開形）４２ａを介して圧縮機モータ２Ｍを接続
する。商用交流電源３０と接触器接点４１ａとの接続ラ
インに上記電流センサ４４を取付ける。商用交流電源３
０と接触器接点４２ａとの接続ラインに上記電流センサ
４４を取付ける。A compressor motor 2M is connected to the commercial AC power source 30 via a contact (normally open type) 42a of the electromagnetic contactor 42. The current sensor 44 is attached to the connection line between the commercial AC power supply 30 and the contactor contact 41a. Commercial AC power supply 3
The current sensor 44 is attached to the connection line between 0 and the contactor contact 42a.
【００２８】一方、室内制御部５０に、電動膨張弁２
１、送風用モータ２３Ｍ、室内温度センサ２４、冷媒温
度センサ２５，２６、冷媒圧力センサ２７、およびリモ
ートコントロール式の操作器（以下、リモコンと略称す
る）６０を接続する。リモコン６０は、運転条件を設定
するための各種キー釦（図示しない）を有するととも
に、表示部６１を有している。On the other hand, in the indoor control unit 50, the electric expansion valve 2
1, a blower motor 23M, an indoor temperature sensor 24, refrigerant temperature sensors 25 and 26, a refrigerant pressure sensor 27, and a remote control type operation device (hereinafter abbreviated as a remote controller) 60 are connected. The remote controller 60 has various key buttons (not shown) for setting operating conditions, and also has a display section 61.
【００２９】室内制御部４０は、主要な機能手段として
次の［１］〜［５］を備える。
［１］リモコン６０の操作に基づく運転モード、運転開
始、運転停止などの指令を室外ユニットＡに送る手段。The indoor control section 40 has the following [1] to [5] as main functional means. [1] Means for sending commands such as an operation mode, operation start, operation stop, etc., to the outdoor unit A based on the operation of the remote controller 60.
【００３０】［２］室内温度センサ２４の検知温度（吸
込空気温度）Ｔａとリモコン６０で設定される設定室内
温度Ｔｓとの差（空調負荷）を求め、その温度差に対応
する要求能力を室外ユニットＡに知らせる手段。[2] The difference (air conditioning load) between the detected temperature (intake air temperature) Ta of the indoor temperature sensor 24 and the set indoor temperature Ts set by the remote controller 60 is obtained, and the required capacity corresponding to the temperature difference is obtained outdoors. Means to inform unit A.
【００３１】［３］当該室内ユニットの要求能力に応じ
て電動膨張弁２１の開度を制御し、当該室内ユニットの
運転停止（または運転休止）時は電動膨張弁２１を全閉
する手段。[3] Means for controlling the opening degree of the electric expansion valve 21 according to the required capacity of the indoor unit and fully closing the electric expansion valve 21 when the operation of the indoor unit is stopped (or stopped).
【００３２】［４］冷房時、室内熱交換器２２の出口側
の冷媒温度センサ２６の検知温度Ｔｅ2 と室内熱交換器
２２の入口側の冷媒温度センサ２５の検知温度Ｔｅ1 と
の差（＝Ｔｅ2 −Ｔｅ1 ）を室内熱交換器２２における
冷媒の過熱度として検出する手段。[4] During cooling, the difference between the temperature Te 2 detected by the refrigerant temperature sensor 26 on the outlet side of the indoor heat exchanger 22 and the temperature Te 1 detected by the refrigerant temperature sensor 25 on the inlet side of the indoor heat exchanger 22 ( = Te 2 −Te 1 ) as the degree of superheat of the refrigerant in the indoor heat exchanger 22.
【００３３】［５］検出した過熱度があらかじめ定めて
いる一定値となるよう、電動膨張弁２１の開度を補正す
る手段。室外制御部５０は、主要な機能手段として次の
［１］〜［５］を備える。[5] A means for correcting the opening degree of the electric expansion valve 21 so that the detected superheat degree becomes a predetermined constant value. The outdoor control unit 50 includes the following [1] to [5] as main functional means.
【００３４】［１］圧縮機１，２の運転容量（圧縮機
１，２の運転台数および圧縮機１の運転周波数Ｆ）を、
各室内ユニットＢの要求能力の合計に応じて制御する手
段。
［２］四方弁５を非作動状態に設定し、圧縮機１，２の
吐出冷媒を四方弁５、室外熱交換器６、電動膨張弁２
１、室内熱交換器２２、四方弁５に通して圧縮機１，２
に戻し、冷房運転を実行する手段。[1] The operating capacities of the compressors 1 and 2 (the number of operating compressors 1 and 2 and the operating frequency F of the compressor 1) are
A means for controlling according to the total required capacity of each indoor unit B. [2] The four-way valve 5 is set to a non-operating state, and the refrigerant discharged from the compressors 1 and 2 is used as the four-way valve 5, the outdoor heat exchanger 6, and the electric expansion valve 2.
1, through the indoor heat exchanger 22, the four-way valve 5, the compressor 1,2
The means for performing the cooling operation.
【００３５】［３］四方弁５を切換え作動し、圧縮機
１，２の吐出冷媒を四方弁５、室内熱交換器２２、流量
調整弁２１、室外熱交換器６、四方弁５に通して圧縮機
１，２に戻し、暖房運転を実行する手段。[3] The four-way valve 5 is switched and operated, and the refrigerant discharged from the compressors 1 and 2 is passed through the four-way valve 5, the indoor heat exchanger 22, the flow rate adjusting valve 21, the outdoor heat exchanger 6, and the four-way valve 5. A means for returning to the compressors 1 and 2 and performing heating operation.
【００３６】［４］電磁接触器４１，４２の接点溶着を
検出する溶着検出手段。
［５］圧縮機１または圧縮機２の運転停止が必要なとき
に上記溶着検出手段が接点溶着を検出すると冷凍サイク
ルを所定の運転状態に設定する保護手段。[4] Welding detection means for detecting contact welding of the electromagnetic contactors 41, 42. [5] A protection means for setting the refrigeration cycle to a predetermined operating state when the welding detection means detects contact welding when the compressor 1 or the compressor 2 needs to be stopped.
【００３７】つぎに、上記の構成の作用を図３のフロー
チャートを参照して説明する。任意の室内ユニットＢの
リモコン６０で運転開始操作がなされると、圧縮機１，
２のうち先ず圧縮機１を起動し、運転を開始する。Next, the operation of the above configuration will be described with reference to the flowchart of FIG. When the operation start operation is performed by the remote controller 60 of any indoor unit B, the compressor 1,
First of all, the compressor 1 is started and the operation is started.
【００３８】室内ユニットＢは、室内温度センサ２４の
検知温度Ｔａとリモコン６０による設定室内温度Ｔｓと
の差を求め、その温度差に対応する要求能力を室外ユニ
ットＡに知らせる。The indoor unit B obtains the difference between the detected temperature Ta of the indoor temperature sensor 24 and the set indoor temperature Ts by the remote controller 60, and informs the outdoor unit A of the required capacity corresponding to the temperature difference.
【００３９】また、室内ユニットＢは、電動膨張弁２１
の開度を当該ユニットの要求能力に応じて調節する。た
とえば、要求能力が零（運転が停止または休止）なら電
動膨張弁２１を全閉し、要求能力が大きくなるほど電動
膨張弁２１の開度を増す。Further, the indoor unit B includes an electric expansion valve 21.
The opening degree of is adjusted according to the required capacity of the unit. For example, if the required capacity is zero (the operation is stopped or stopped), the electric expansion valve 21 is fully closed, and the opening degree of the electric expansion valve 21 is increased as the required capacity increases.
【００４０】室外ユニットＡは、圧縮機１，２の運転容
量（圧縮機１，２の運転台数および圧縮機１の運転周波
数Ｆ）を、各室内ユニットＢからの要求能力の合計に応
じた運転容量に設定する。The outdoor unit A operates the operating capacities of the compressors 1 and 2 (the number of operating compressors 1 and 2 and the operating frequency F of the compressor 1) in accordance with the total required capacity from each indoor unit B. Set to capacity.
【００４１】たとえば、要求能力の合計が小さければ、
電磁接触器４１のみ付勢してインバータ回路４３を動作
させ、そのインバータ回路４３の出力周波数Ｆを制御し
て圧縮機１の単独による能力可変運転を実行する。要求
能力の合計が増すと、電磁接触器４１を付勢してインバ
ータ回路４３による圧縮機１の能力可変運転を行なうと
ともに、電磁接触器４２を付勢して圧縮機２の運転を加
える。For example, if the total required capacity is small,
Only the electromagnetic contactor 41 is energized to operate the inverter circuit 43, the output frequency F of the inverter circuit 43 is controlled, and the capacity varying operation by the compressor 1 alone is executed. When the total required capacity increases, the electromagnetic contactor 41 is energized to perform variable capacity operation of the compressor 1 by the inverter circuit 43, and the electromagnetic contactor 42 is energized to add operation of the compressor 2.
【００４２】各室内ユニットＢの運転台数が減少するな
どして要求能力の合計が減っていくと、その減少に伴
い、先ず電磁接触器４２を消勢して圧縮機２の運転を停
止し、最後に電磁接触器４１を消勢して圧縮機１の運転
を停止することになる。When the total required capacity decreases as the number of operating indoor units B decreases, the electromagnetic contactor 42 is first deenergized and the operation of the compressor 2 is stopped. Finally, the electromagnetic contactor 41 is deenergized to stop the operation of the compressor 1.
【００４３】ただし、圧縮機１の運転停止が必要である
にもかかわらず、接触器接点４１ａが溶着したまま開か
ないことがある。こうなると、圧縮機１の運転が停止で
きないまま不要に継続してしまう。接触器接点４２ａが
溶着した場合には、圧縮機２の運転が停止できないまま
不要に継続することになる。However, even though the compressor 1 needs to be stopped, the contactor contact 41a may not be opened while being welded. If this happens, the operation of the compressor 1 will continue unnecessarily without being stopped. When the contactor contact 42a is welded, the operation of the compressor 2 will continue unnecessarily without being stopped.
【００４４】この場合、圧縮機１あるいは圧縮機２の運
転が不要に継続する一方で、運転停止（休止を含む）と
なる室内ユニットＢの電動膨張弁２１は全閉していて冷
媒の流通経路が遮断された状態にあり、この影響で圧縮
機１または圧縮機２が真空運転となる。In this case, while the operation of the compressor 1 or the compressor 2 is continued unnecessarily, the electric expansion valve 21 of the indoor unit B in which the operation is stopped (including suspension) is fully closed, and the refrigerant flow path. Is shut off, and the compressor 1 or the compressor 2 is in vacuum operation due to this effect.
【００４５】圧縮機１が真空運転になると、圧縮機１の
内部温度が上昇して吐出冷媒温度Ｔｄ1 が上昇する。圧
縮機２が真空運転になると、圧縮機２の内部温度が上昇
して吐出冷媒温度Ｔｄ2 が上昇する。When the compressor 1 is operated in vacuum, the internal temperature of the compressor 1 rises and the discharge refrigerant temperature Td 1 rises. When the compressor 2 is in vacuum operation, the internal temperature of the compressor 2 rises and the discharge refrigerant temperature Td 2 rises.
【００４６】吐出冷媒温度Ｔｄ1 ，Ｔｄ2 については冷
媒温度センサ１２，１４で検知しており、両検知温度の
少なくとも一方があらかじめ定めている設定値以上に上
昇すると、接触器接点４１ａまたは４２ａが溶着してい
ると判定する。そして、この判定に基づき、全閉状態に
ある電動膨張弁２１を所定開度状態に保持する。The discharged refrigerant temperatures Td 1 and Td 2 are detected by the refrigerant temperature sensors 12 and 14, and when at least one of the detected temperatures rises above a predetermined set value, the contactor contact 41a or 42a is opened. It is determined that welding has occurred. Then, based on this determination, the electrically-operated expansion valve 21 in the fully closed state is held at the predetermined opening state.
【００４７】こうして、全閉状態の電動膨張弁２１を所
定開度状態に保持することにより、冷媒の流通経路が確
保された状態となり、圧縮機１または圧縮機２の真空運
転が解除される。したがって、圧縮機モータ１Ｍまたは
圧縮機モータ２Ｍの巻線が焼損に至るのを防ぐことがで
きる。しかも、高圧側圧力の異常上昇を押さえることが
でき、よって熱交換器や配管など冷凍サイクル部品に対
する悪影響を回避できる。In this way, by keeping the electric expansion valve 21 in the fully closed state at the predetermined opening state, the refrigerant flow path is secured, and the vacuum operation of the compressor 1 or the compressor 2 is released. Therefore, it is possible to prevent the winding of the compressor motor 1M or the compressor motor 2M from being burnt out. Moreover, it is possible to suppress an abnormal rise in the high-pressure side pressure, and thus it is possible to avoid adverse effects on refrigeration cycle parts such as heat exchangers and piping.
【００４８】また、接点溶着を検出（判定）した時点
で、その旨をリモコン６０の表示部６１で文字表示す
る。この文字表示により、接点溶着が生じて運転が異常
な状態にある旨が報知される。このとき、異常停止とし
てリモコン６０の操作による各種設定を無視するように
している。When the contact welding is detected (determined), the fact is displayed on the display section 61 of the remote controller 60 in characters. This character display informs that the contact is welded and the operation is abnormal. At this time, various settings made by operating the remote controller 60 are ignored as an abnormal stop.
【００４９】次に、この発明の第２実施例について説明
する。上記第１実施例では、接点溶着を検出したときに
設定する“所定の運転状態”として、全閉状態の電動膨
張弁２１を所定の開度状態に保持するようにしたが、第
２実施例では、“所定の運転状態”として、運転停止
（休止を含む）となる室内ユニットＢをその停止の直前
の運転モードにて継続的に運転再開する。たとえば、直
前の運転が冷房モードであれば冷房運転、暖房モードで
あれば暖房運転を再開する。この運転再開により、自ず
と電動膨張弁２１が開かれて冷媒の流通経路が確保され
た状態となり、圧縮機１または圧縮機２の真空運転が解
除される。Next, described <br/> a second embodiment of the present invention. In the first embodiment described above, the electric expansion valve 21 in the fully closed state is held at the predetermined opening state as the "predetermined operating state" set when the contact welding is detected. Then, as the "predetermined operating state", the indoor unit B, which is stopped (including pause), is continuously restarted in the operating mode immediately before the stop. For example, if the immediately preceding operation is the cooling mode, the cooling operation is restarted, and if it is the heating mode, the heating operation is restarted. By restarting the operation, the electric expansion valve 21 is automatically opened to secure the refrigerant circulation path, and the vacuum operation of the compressor 1 or the compressor 2 is released.
【００５０】この発明の第３実施例について説明する。
第３実施例では、運転停止が必要な圧縮機に対応の電磁
接触器について接点溶着を検出したとき、運転停止が必
要な圧縮機の運転容量に応じた冷媒循環量が確保できる
よう各室内熱交換器Ｂへの冷媒の流通を制御する。[0050] that describes the third embodiment of the present invention.
In the third embodiment, when the contact welding is detected in the electromagnetic contactor corresponding to the compressor that needs to be shut down, each indoor heat is ensured so that the refrigerant circulation amount according to the operating capacity of the compressor that needs to be shut down can be secured. The circulation of the refrigerant to the exchanger B is controlled.
【００５１】たとえば、圧縮機１の運転停止が必要なと
きに電磁接触器４１の接点溶着を検出すると、運転停止
（休止を含む）となる室内ユニットＢのうち、圧縮機１
の運転容量と同等容量の室内熱交換器２２を有する室内
ユニットＢに冷媒が流れるよう、その室内ユニットＢの
運転を再開する。圧縮機２の運転停止が必要なときに電
磁接触器４２の接点溶着を検出すると、運転停止（休止
を含む）となる室内ユニットＢのうち、圧縮機２の運転
容量と同等容量の室内熱交換器２２を有する室内ユニッ
トＢに冷媒が流れるよう、その室内ユニットＢの運転を
再開する。再開時の運転モードについては、停止の直前
の運転モードとする。For example, when the contact welding of the electromagnetic contactor 41 is detected when the operation of the compressor 1 needs to be stopped, the compressor 1 is selected from the indoor units B whose operation is stopped (including suspension).
The operation of the indoor unit B is restarted so that the refrigerant flows to the indoor unit B having the indoor heat exchanger 22 having the same capacity as the operating capacity. When the contact welding of the electromagnetic contactor 42 is detected when the operation of the compressor 2 needs to be stopped, the indoor heat exchange having the same capacity as the operation capacity of the compressor 2 in the indoor unit B that is in the operation stop (including the suspension). The operation of the indoor unit B is restarted so that the refrigerant flows to the indoor unit B having the container 22. The operation mode when restarting is the one immediately before the stop.
【００５２】この発明の第４実施例について説明する
（請求項３に対応）。上記第２および第３実施例では、
停止の直前の運転モードで運転を再開するようにした
が、冷房モードが続くと室内温度Ｔａがどんどん低下し
ていく。そのまま運転が続くと室内熱交換器２２で冷媒
が蒸発しきれなくなり、圧縮機への液バックが生じて圧
縮機に悪影響を与える心配がある。暖房モードが続く
と、室内温度Ｔａが上昇して高圧側圧力が異常上昇し、
冷凍サイクル部品に悪影響を与える心配がある。A fourth embodiment of the present invention will be described (corresponding to claim 3 ). In the second and third embodiments described above,
Although the operation is restarted in the operation mode immediately before the stop, the room temperature Ta gradually decreases when the cooling mode continues. If the operation is continued as it is, the refrigerant cannot be completely evaporated in the indoor heat exchanger 22, and liquid back to the compressor may occur, which may adversely affect the compressor. If the heating mode continues, the room temperature Ta rises and the high-pressure side pressure rises abnormally.
There is concern that it may adversely affect the refrigeration cycle parts.
【００５３】そこで、第４実施例では、直前の運転モー
ドで運転を再開した後、室内温度センサ２４の検知温度
Ｔａと設定室内温度Ｔｓとの差を求め、その差が所定値
超えたとき四方弁５を反転する。Therefore, in the fourth embodiment, after the operation is restarted in the immediately previous operation mode, the difference between the detected temperature Ta of the indoor temperature sensor 24 and the set indoor temperature Ts is obtained, and when the difference exceeds a predetermined value, it is squared. Reverse valve 5.
【００５４】四方弁５が反転すると、圧縮機への液バッ
クあるいは高圧側圧力の異常上昇が抑制される。その
後、検知温度Ｔａと設定室内温度Ｔｓとの差が所定値以
上超えるごとに、四方弁５の反転を繰り返す。When the four-way valve 5 is reversed, liquid back to the compressor or abnormal increase of the high pressure side pressure is suppressed. After that, the inversion of the four-way valve 5 is repeated every time the difference between the detected temperature Ta and the set room temperature Ts exceeds a predetermined value.
【００５５】なお、上記各実施例では、吐出冷媒温度Ｔ
ｄ1 ，Ｔｄ2 を用いて接点溶着を検出したが、それに限
らず、圧縮機１または圧縮機２の真空運転時に低圧側圧
力Ｐｓが低下することに着目し、その低圧側圧力（圧力
センサ１６の検知圧力）Ｐｓがあらかじめ定めている設
定値まで下降したところで接点溶着ありと判定してもよ
い。 In each of the above embodiments, the discharge refrigerant temperature T
Although contact welding was detected using d 1 and Td 2 , the low pressure side pressure Ps (pressure sensor 16) is not limited to this, and attention is paid to the fact that the low pressure side pressure Ps decreases during vacuum operation of the compressor 1 or the compressor 2. It is possible to judge that there is contact welding when the detected pressure Ps) has fallen to a preset value.
Yes.
【００５６】圧縮機１，２の運転時に流れる電流Ｉを電
流センサ４４，４５で検知し、その検知電流Ｉの有無か
ら、接点溶着による圧縮機１または圧縮機２の不要な運
転継続を検出するようにしてもよい。 A current I flowing during the operation of the compressors 1 and 2 is detected by the current sensors 44 and 45, and an unnecessary continuation of the operation of the compressor 1 or the compressor 2 due to contact welding is detected from the presence or absence of the detected current I. but it may also be so.
【００５７】圧縮機１，２の運転中は高圧側圧力Ｐｄと
低圧側圧力Ｐｓとに差が生じ、圧縮機１，２の運転が停
止すると高圧側圧力Ｐｄと低圧側圧力Ｐｓとが徐々にバ
ランスしてやがてＰｄ＝Ｐｓとなる。しかしながら、接
点溶着によって圧縮機１または圧縮機２が不要な運転を
継続すると、真空運転が生じることもあって、高圧側圧
力Ｐｄと低圧側圧力Ｐｓとはバランスするどころか、高
圧側圧力Ｐｄは上昇し、低圧側圧力Ｐｓは下降し、両圧
力の差が拡がっていくことになる。そこで、運転停止の
必要時から一定時間後に高圧側圧力Ｐｄと低圧側圧力Ｐ
ｓとの差を検出し、その差が所定値以上のとき、接点溶
着ありと判定してもよい。 During operation of the compressors 1 and 2, a difference between the high pressure side pressure Pd and the low pressure side pressure Ps occurs, and when the operation of the compressors 1 and 2 is stopped, the high pressure side pressure Pd and the low pressure side pressure Ps gradually. After a balance, Pd = Ps. However, if the compressor 1 or the compressor 2 continues to operate unnecessarily due to contact welding, vacuum operation may occur, so that the high-pressure side pressure Pd and the low-pressure side pressure Ps are not balanced but the high-pressure side pressure Pd rises. However, the low-pressure side pressure Ps drops, and the difference between the two pressures expands. Therefore, the high-pressure side pressure Pd and the low-pressure side pressure Pd after a certain time from the time when the operation is stopped
detecting a difference between s, when the difference is greater than a predetermined value, but it may also be determined that there is contact welding.
【００５８】ここまで述べた接点溶着の検出手段（吐出
冷媒温度Ｔｄ1 ，Ｔｄ2 の上昇による検出手段、低圧側
圧力Ｐｓの下降による検出手段、通電電流Ｉの有無によ
る検出手段、および高圧側圧力Ｐｄと低圧側圧力Ｐｓと
の差による検出手段）については、一つの手段だけでな
く複数の手段をまとめて設けて接点溶着を複数の方向か
ら検出し、いずれか一つの手段が接点溶着を検出したと
きに保護制御を始めるようにしてもよい。 The contact welding detection means described above (detection means by increasing discharge refrigerant temperatures Td 1 and Td 2 , detection means by decreasing low pressure side pressure Ps, detection means by presence / absence of energizing current I, and high pressure side pressure) Regarding the detection means based on the difference between Pd and the low-pressure side pressure Ps), not only one means but a plurality of means are collectively provided to detect the contact welding from a plurality of directions, and any one of the means detects the contact welding. It was but it may also be to begin the protection control at the time.
【００５９】吐出冷媒温度Ｔｄ1 ，Ｔｄ2 、あるいは高
圧側圧力Ｐｄに代えて、室外熱交換器６の温度（熱交換
器温度センサ１８の検知温度）や室内熱交換器２２の温
度を基に接点溶着を検出するようにしてもよい。Based on the temperature of the outdoor heat exchanger 6 (the temperature detected by the heat exchanger temperature sensor 18) and the temperature of the indoor heat exchanger 22, instead of the discharge refrigerant temperatures Td 1 and Td 2 or the high pressure side pressure Pd. The contact welding may be detected.
【００６０】次に、この発明の第５実施例について説明
する（請求項２に対応）。ここでは、図４のフローチャ
ートに示すように、接点溶着を高圧側圧力Ｐｄの上昇に
よる高圧スイッチ１７の作動から検出する。すなわち、
高圧スイッチ１７の作動がｘ秒間続くと、接点溶着あり
と判定し、冷房時なら室外送風機７を継続して運転す
る。この運転により、高圧側圧力Ｐｄの上昇が抑制され
る。その後、高圧スイッチ１７が復帰したら、室外送風
機７の運転を停止する。Next explained is the fifth embodiment of the invention (corresponding to claim 2 ). Here, as shown in the flowchart of FIG. 4, contact welding is detected from the operation of the high-voltage switch 17 due to the increase in the high-pressure side pressure Pd. That is,
When the operation of the high-pressure switch 17 continues for x seconds, it is determined that the contact welding has occurred, and during cooling, the outdoor blower 7 is continuously operated. By this operation, the increase in the high pressure side pressure Pd is suppressed. After that, when the high pressure switch 17 returns, the operation of the outdoor blower 7 is stopped.
【００６１】こうして、高圧スイッチ１７が作動するご
とに室外送風機７を運転し、高圧スイッチ１７の復帰を
待って室外送風機７の運転を停止する。ただし、室外送
風機７が故障して動かない場合、高圧側圧力Ｐｄの上昇
を抑制できなくなる。Thus, the outdoor blower 7 is operated each time the high pressure switch 17 is operated, and the operation of the outdoor blower 7 is stopped after the high pressure switch 17 is restored. However, when the outdoor blower 7 fails and does not move, it becomes impossible to suppress the rise of the high-pressure side pressure Pd.
【００６２】そこで、高圧スイッチ１７が所定時間以上
にわたって復帰しない場合、室外送風機７が故障と判定
し、四方弁５を反転する。四方弁５が反転すると、高圧
側と低圧側とが圧力バランスし、結果的に高圧側圧力の
上昇が抑制される。Therefore, when the high-pressure switch 17 does not return for a predetermined time or longer, the outdoor blower 7 is determined to be out of order, and the four-way valve 5 is reversed. When the four-way valve 5 is reversed, the high pressure side and the low pressure side are pressure balanced, and as a result, the increase in the high pressure side pressure is suppressed.
【００６３】この抑制によって高圧スイッチ１７は復帰
するものの、接点溶着による圧縮機の不要な運転が続け
ば高圧側圧力は上昇に転じ、再び高圧スイッチ１７が作
動して復帰しなくなる。このとき、四方弁５を再び反転
する。Although the high-pressure switch 17 is restored by this suppression, if unnecessary operation of the compressor due to contact welding continues, the high-pressure side pressure starts increasing and the high-pressure switch 17 operates again and does not return. At this time, the four-way valve 5 is reversed again.
【００６４】こうして四方弁５の反転を繰り返すことに
より、高圧側圧力Ｐｄの異常上昇を回避することができ
る。なお、図４に二点鎖線で囲んで示すように、室外送
風機７の故障を判定した後の四方弁５の反転に際し、同
時に室内送風機２３の運転を開始し、これによって高圧
側圧力Ｐｄの上昇を抑制するようにしてもよい。By repeating the reversal of the four-way valve 5 in this manner, it is possible to avoid an abnormal increase in the high pressure side pressure Pd. Note that, as shown by the chain double-dashed line in FIG. 4, when the four-way valve 5 is reversed after the failure of the outdoor blower 7 is determined, the operation of the indoor blower 23 is started at the same time, and the high-side pressure Pd rises. May be suppressed.
【００６５】[0065]
【発明の効果】以上述べたようにこの発明によれば、電
磁接触器の接点が溶着した場合でも圧縮機をはじめとす
る冷凍サイクル部品の安全を十分に確保し得る空気調和
機を提供できる。As described above, according to the present invention, it is possible to provide an air conditioner capable of sufficiently securing the safety of refrigeration cycle parts such as a compressor even when the contacts of the electromagnetic contactor are welded.
【図１】各同実施例の制御装置のブロック図。FIG. 1 is a block diagram of a control device according to each of the embodiments.
【図２】各実施例の冷凍サイクルの構成図。FIG. 2 is a configuration diagram of a refrigeration cycle of each example.
【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５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 fifth embodiment.
Ａ…室外ユニット、Ｂ…室内ユニット、１…能力可変圧
縮機、２…能力固定圧縮機、５…四方弁、６…室外熱交
換器、７…室外送風機、１２，１４…冷媒温度センサ、
１３，１５，１６…冷媒圧力センサ、１７…高圧スイッ
チ、１８…熱交換器温度センサ、２１…電子膨張弁、２
２…室内熱交換器、２３…室内送風機、２４…室内温度
センサ、２５，２６…冷媒温度センサ、２７…冷媒圧力
センサ、３０…商用交流電源、４０…室外制御部、４
１，４２…電磁接触器、 ４１ａ，４２ａ…接点、４３
…インバータ回路、５０…室内制御部、６０…リモコ
ン。A ... Outdoor unit, B ... Indoor unit, 1 ... Variable capacity compressor, 2 ... Fixed capacity compressor, 5 ... Four-way valve, 6 ... Outdoor heat exchanger, 7 ... Outdoor blower, 12, 14 ... Refrigerant temperature sensor,
13, 15, 16 ... Refrigerant pressure sensor, 17 ... High pressure switch, 18 ... Heat exchanger temperature sensor, 21 ... Electronic expansion valve, 2
2 ... Indoor heat exchanger, 23 ... Indoor blower, 24 ... Indoor temperature sensor, 25, 26 ... Refrigerant temperature sensor, 27 ... Refrigerant pressure sensor, 30 ... Commercial AC power supply, 40 ... Outdoor control unit, 4
1, 42 ... Electromagnetic contactor, 41a, 42a ... Contact, 43
... inverter circuit, 50 ... indoor control section, 60 ... remote control.
フロントページの続き (56)参考文献 特開 平５−196274（ＪＰ，Ａ) 特開 平７−19678（ＪＰ，Ａ) 特開 平４−278155（ＪＰ，Ａ) 特開 平６−257906（ＪＰ，Ａ) 特開 平５−196283（ＪＰ，Ａ) 特開 平４−86444（ＪＰ，Ａ) 特開 平４−251148（ＪＰ，Ａ) 特表 平１−500687（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F25B 49/02 570 F24F 11/02 102 F25B 49/00 Continuation of front page (56) Reference JP-A-5-196274 (JP, A) JP-A-7-19678 (JP, A) JP-A-4-278155 (JP, A) JP-A-6-257906 (JP , A) JP-A-5-196283 (JP, A) JP-A-4-86444 (JP, A) JP-A-4-251148 (JP, A) JP-A-1-500687 (JP, A) (58) Fields surveyed (Int.Cl. 7 , DB name) F25B 49/02 570 F24F 11/02 102 F25B 49/00
Claims (3)
張弁、室内熱交換器を順次接続した冷凍サイクルと、室
外送風機と、室内送風機と、上記圧縮機への通電を接点
の開閉により制御する電磁接触器と、この電磁接触器で
上記圧縮機の運転を制御し且つ上記電動膨張弁の開度、
室外送風機の運転、室内送風機の運転を制御する制御装
置と、を備えた空気調和機において、 上記制御装置は、上記電磁接触器の接点溶着を検出する
溶着検出手段と、上記圧縮機の運転停止が必要なときに
上記溶着検出手段が接点溶着を検出すると上記電動膨張
弁を所定の開度状態に保持する保護手段と、を備えたこ
とを特徴とする空気調和機。1. A refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, an electric expansion valve, and an indoor heat exchanger are sequentially connected, an outdoor blower, an indoor blower, and the contacts for energizing the compressor are opened and closed. And an electromagnetic contactor controlled by the electromagnetic contactor to control the operation of the compressor with the electromagnetic contactor and the opening degree of the electric expansion valve,
In an air conditioner provided with a control device for controlling the operation of the outdoor blower and the operation of the indoor blower, the control device includes welding detection means for detecting contact welding of the electromagnetic contactor, and stopping operation of the compressor. the electric expansion when the welding detection means detects the contact welding when is needed
An air conditioner comprising: a protection unit that holds the valve in a predetermined opening state .
張弁、室内熱交換器を順次接続した冷凍サイクルと、室
外送風機と、室内送風機と、上記圧縮機への通電を接点
の開閉により制御する電磁接触器と、この電磁接触器で
上記圧縮機の運転を制御し且つ上記電動膨張弁の開度、
室外送風機の運転、室内送風機の運転を制御する制御装
置と、を備えた空気調和機において、 上記制御装置は、上記冷凍サイクルの高圧側圧力を検知
する圧力検知手段と、上記電磁接触器の接点溶着を検出
する溶着検出手段と、上記圧縮機の運転停止が必要なと
きに上記溶着検出手段が接点溶着を検出すると上記室外
送風機を継続して運転し、この室外送風機の運転にもか
かわらず上記圧力検知手段の検知圧力が所定値以上とな
ってその状態が一定時間継続したときに上記四方弁を反
転させる保護手段と、を備えたことを特徴とする空気調
和機。2. A refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, an electric expansion valve, and an indoor heat exchanger are sequentially connected, an outdoor blower, an indoor blower, and the energization of the compressor is opened and closed. And an electromagnetic contactor controlled by the electromagnetic contactor to control the operation of the compressor with the electromagnetic contactor and the opening degree of the electric expansion valve,
An air conditioner comprising: a control device for controlling the operation of the outdoor blower and the operation of the indoor blower, wherein the control device detects the high pressure side pressure of the refrigeration cycle.
The pressure detection means, the welding detection means for detecting the contact welding of the electromagnetic contactor, and the outdoor when the welding detection means detects the contact welding when the operation of the compressor needs to be stopped.
Continue to operate the blower and use it to operate this outdoor blower.
Even if the pressure detected by the pressure detection means is above the specified value.
The above four-way valve is
An air conditioner comprising: a protection means for rotating the air conditioner.
電動膨張弁、並列状態の複数の室内熱交換器を順次接続
して冷媒を循環させる冷凍サイクルと、室外送風機と、
複数の室内送風機と、上記各圧縮機への通電を接点の開
閉により制御する複数の電磁接触器と、これら電磁接触
器で上記各圧縮機の運転を制御し且つ上記電動膨張弁の
開度、室外送風機の運転、各室内送風機の運転を制御す
る制御装置と、を備えた空気調和機において、 上記制御装置は、上記各電磁接触器の接点溶着を検出す
る溶着検出手段と、上記各圧縮機のいずれかの運転停止
が必要なときに同圧縮機に対応する電磁接触器の接点溶
着を上記溶着検出手段が検出すると同圧縮機の運転容量
に応じた冷媒循環量が確保できるよう上記各室内熱交換
器への冷媒の流通を制御する保護手段と、室内温度を検
知する温度検知手段と、この温度検知手段の検知温度と
設定室内温度との差が所定値以上超えたときに上記四方
弁を反転させる手段と、を備えたことを特徴とする空気
調和機。3. A plurality of compressors, a four-way valve, an outdoor heat exchanger,
An electric expansion valve, a refrigeration cycle in which a plurality of indoor heat exchangers in a parallel state are sequentially connected to circulate a refrigerant, and an outdoor blower,
A plurality of indoor blowers, a plurality of electromagnetic contactors that control the energization of each compressor by opening and closing contacts, the operation of each compressor with these electromagnetic contactors and the opening degree of the electric expansion valve, In an air conditioner provided with an operation of an outdoor blower and a control device for controlling the operation of each indoor blower, the control device is a welding detection means for detecting contact welding of each of the electromagnetic contactors, and each of the compressors. When it is necessary to stop the operation of any of the above, if the welding detection means detects the contact welding of the electromagnetic contactor corresponding to the compressor, it is possible to secure a refrigerant circulation amount according to the operating capacity of the compressor. Protective measures that control the flow of refrigerant to the heat exchanger and indoor temperature
Temperature detecting means to know, and the temperature detected by this temperature detecting means
When the difference from the set room temperature exceeds a specified value, the above four directions
An air conditioner comprising: means for reversing a valve .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05128395A JP3420652B2 (en) | 1995-03-10 | 1995-03-10 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05128395A JP3420652B2 (en) | 1995-03-10 | 1995-03-10 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08247589A JPH08247589A (en) | 1996-09-27 |
| JP3420652B2 true JP3420652B2 (en) | 2003-06-30 |
Family
ID=12882617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05128395A Expired - Fee Related JP3420652B2 (en) | 1995-03-10 | 1995-03-10 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3420652B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006189244A (en) * | 2004-12-10 | 2006-07-20 | Daikin Ind Ltd | Air conditioner |
| KR20060070885A (en) * | 2004-12-21 | 2006-06-26 | 엘지전자 주식회사 | Air conditioner |
| JP2016027296A (en) * | 2014-07-02 | 2016-02-18 | 旭硝子株式会社 | Heat cycle system |
| JP2018204817A (en) * | 2017-05-31 | 2018-12-27 | 三菱重工サーマルシステムズ株式会社 | Control apparatus for freezing machine system, freezing machine system, control method for freezing machine system, and control program for freezing machine system |
-
1995
- 1995-03-10 JP JP05128395A patent/JP3420652B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08247589A (en) | 1996-09-27 |
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