JP5686754B2 - Air conditioner - Google Patents
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Description
本発明は、空気調和機の室外機に備わる圧縮機の起動性向上に関する。 The present invention relates to improvement in startability of a compressor provided in an outdoor unit of an air conditioner.
空気調和機は、運転停止後に圧縮機の吐出と吸込みの圧力差を低減させるための一定のサイクルバランス期間を設け、再起動する際の起動負荷を軽減する制御を行う。しかし、空気調和機の室外機が周辺空気の循環しにくい設置環境にあると、冷房運転では運転中の室外機周辺は高温状態となり、運転を停止しても高温状態が続く。このような場合、サイクルバランス期間を設けても冷凍サイクルの圧力差が残ったままになり、圧縮機モータを再起動する際の起動負荷が大きいためモータ巻き線に流れる電流が増加して過電流停止に至る。 The air conditioner provides a constant cycle balance period for reducing the pressure difference between the discharge and suction of the compressor after the operation is stopped, and performs control to reduce the starting load when restarting. However, if the outdoor unit of the air conditioner is in an installation environment in which the ambient air is difficult to circulate, the vicinity of the outdoor unit being operated is in a high temperature state during cooling operation, and the high temperature state continues even when the operation is stopped. In such a case, even if a cycle balance period is provided, the pressure difference of the refrigeration cycle remains, and since the starting load when restarting the compressor motor is large, the current flowing in the motor winding increases and overcurrent It leads to a stop.
このような空気調和機における圧縮機モータの再起動性を向上させる技術として例えば特許文献１が知られている。 For example, Patent Document 1 is known as a technique for improving the restartability of a compressor motor in such an air conditioner.
特許文献１には、圧縮機モータの運転が停止する毎に室外機に備わるファンを一定期間継続させ、室外熱交換器に通風する技術を開示している。これによると、凝縮器内の冷媒を冷やして、高圧側圧力を速やかに低下させることで、圧縮機の運転停止後再起動可能になるまでの時間を短縮することができる。 Patent Document 1 discloses a technique in which a fan provided in an outdoor unit is continued for a certain period each time the operation of a compressor motor is stopped, and is passed through an outdoor heat exchanger. According to this, by cooling the refrigerant in the condenser and quickly reducing the high-pressure side pressure, it is possible to shorten the time until the compressor can be restarted after being stopped.
圧縮機モータの再起動時に過電流停止するようなケースは極僅かである。対して、特許文献１は、圧縮機モータが停止する毎に常に室外ファンを一定期間駆動することから、騒音や消費電力の増加につながる。 There are very few cases where overcurrent is stopped when the compressor motor is restarted. On the other hand, in Patent Document 1, the outdoor fan is always driven for a certain period each time the compressor motor stops, leading to an increase in noise and power consumption.
そこで、本発明は圧縮機モータの再起動性を向上させつつ、騒音や消費電力の増加を抑制することを目的とする。 Accordingly, an object of the present invention is to suppress an increase in noise and power consumption while improving the restartability of the compressor motor.
上記目的は、圧縮機と、室外熱交換器と、室外熱交換器に外気を送る室外ファンと、室外制御装置と、を有する室外機と、室内機と、を備え、室外制御装置は、圧縮機を駆動する圧縮機モータに流れる電流値が設定した閾値を超えた場合に圧縮機モータを停止させる過電流保護手段、を有し、１度目に過電流保護手段によって圧縮機モータが停止した場合、室外ファンを設定時間駆動した後に圧縮機モータを駆動し、２度目に過電流保護手段によって圧縮機モータが停止した場合、室外ファンを駆動する設定時間を設けずに圧縮機モータを駆動し、且つ、圧縮機モータの回転数を低下、又は、加速度レートを抑える運転を行うことにより達成できる。
The above object includes an outdoor unit having an compressor, an outdoor heat exchanger, an outdoor fan that sends outside air to the outdoor heat exchanger, and an outdoor control device, and an indoor unit. When the compressor motor that drives the compressor has overcurrent protection means that stops the compressor motor when the value of the current flowing to the compressor motor exceeds the set threshold, the compressor motor is stopped by the overcurrent protection means for the first time When the compressor motor is driven after the outdoor fan is driven for a set time, and the compressor motor is stopped by the overcurrent protection means for the second time, the compressor motor is driven without providing the set time for driving the outdoor fan, And it can achieve by performing the driving | operation which reduces the rotation speed of a compressor motor, or suppresses an acceleration rate .
本発明によれば、本発明は圧縮機モータの再起動性を向上させつつ、騒音や消費電力の増加を抑制することができる。また、サイクルバランス期間を設けずに起動できた場合、残存している差圧を利用できるため、圧縮機の吐出と吸込みの圧力差をつけるための運転時間を短縮することができる。 According to the present invention, the present invention can suppress an increase in noise and power consumption while improving the restartability of the compressor motor. In addition, when the system can be started without providing a cycle balance period, the remaining differential pressure can be used, so that the operation time for creating a pressure difference between the discharge and suction of the compressor can be shortened.
以下、本発明の実施形態について説明する。 Hereinafter, embodiments of the present invention will be described.
以下、本発明の実施例１の空気調和機を図１、図２を用いて説明する。 Hereinafter, the air conditioner of Example 1 of this invention is demonstrated using FIG. 1, FIG.
図１は空気調和機の冷凍サイクル構成図である。室内機Ａと室外機Ｃは、冷凍サイクルにおいて、ガス側配管１０に設けられたガス側配管接続バルブ３と、液側配管１１に設けられた液側配管接続バルブ６とを介して接続されている。室内機Ａには室内熱交換器４、室内ファン５の他、室温センサ等が設けられている。室内ファン５は、室内熱交換器４に室内空気を通風して熱交換し、室内空気を冷却または加熱し、冷房または暖房する。 FIG. 1 is a configuration diagram of a refrigeration cycle of an air conditioner. In the refrigeration cycle, the indoor unit A and the outdoor unit C are connected via a gas side pipe connection valve 3 provided in the gas side pipe 10 and a liquid side pipe connection valve 6 provided in the liquid side pipe 11. Yes. The indoor unit A is provided with a room temperature sensor and the like in addition to the indoor heat exchanger 4 and the indoor fan 5. The indoor fan 5 passes the indoor air through the indoor heat exchanger 4 to exchange heat, cools or heats the indoor air, and cools or heats the indoor air.
一方、室外機Ｃには圧縮機モータ１、四方弁２、室外熱交換器８、電動膨張弁７、外気温度センサ５１、および室外熱交換器温度センサ５２等が設けられている。四方弁２は、圧縮機モータ１から吐出した冷媒ガスを室外熱交換器８に導くか、室内機Ａに導くかの切換えを行うものであり、冷房運転か暖房運転かを切換えるものである。図１の四方弁２の状態は冷房サイクルにした状態であり、冷媒は冷凍サイクル中を実線矢印のように循環する。電動膨張弁７は、液側配管１１に設けられている。 On the other hand, the outdoor unit C is provided with a compressor motor 1, a four-way valve 2, an outdoor heat exchanger 8, an electric expansion valve 7, an outdoor temperature sensor 51, an outdoor heat exchanger temperature sensor 52, and the like. The four-way valve 2 switches whether the refrigerant gas discharged from the compressor motor 1 is guided to the outdoor heat exchanger 8 or the indoor unit A, and switches between cooling operation and heating operation. The state of the four-way valve 2 in FIG. 1 is a state in which the cooling cycle is performed, and the refrigerant circulates in the refrigeration cycle as indicated by solid arrows. The electric expansion valve 7 is provided in the liquid side pipe 11.
また、室外機Ｃには、室外ファン９が室外空気を室外熱交換器８に通風するように配置されている。そして、冷凍サイクルの主要な冷媒温度を検知するために、圧縮機モータ１近傍の吐出配管には冷媒吐出温度センサ５３が配置されている。 In the outdoor unit C, an outdoor fan 9 is disposed so as to vent outdoor air to the outdoor heat exchanger 8. In order to detect the main refrigerant temperature of the refrigeration cycle, a refrigerant discharge temperature sensor 53 is disposed in the discharge pipe near the compressor motor 1.
図２は空気調和機の制御ブロック図を示す。室外機Ｃ、室内機Ａにはそれぞれ室外制御装置２１、室内制御装置３１が設けられている。室内制御装置３１は、制御信号の送受信を行うためのデータ伝送線６１により室外制御装置２１と接続されている。 FIG. 2 shows a control block diagram of the air conditioner. The outdoor unit C and the indoor unit A are provided with an outdoor control device 21 and an indoor control device 31, respectively. The indoor control device 31 is connected to the outdoor control device 21 by a data transmission line 61 for transmitting and receiving control signals.
室内制御装置３１は、リモコン４１から信号を受信して、これに基づいて所定の制御を行う。 The indoor control device 31 receives a signal from the remote controller 41 and performs predetermined control based on the signal.
一方、室外制御装置２１は、圧縮機モータ１から吐出した冷媒の温度を検知するための冷媒吐出温度センサ５３、外気温度を検知するための外気温度センサ５１、室外熱交換器８の温度を検知するための室外熱交換器温度センサ５２等、各種センサからの信号を受信する。また、圧縮機モータ１、電動膨張弁７、室外ファン９等のアクチュエータに接続され、これら温度情報及び室内制御装置３１からデータを入手して制御信号をこれらに送信する。 On the other hand, the outdoor control device 21 detects the temperature of the refrigerant discharge temperature sensor 53 for detecting the temperature of the refrigerant discharged from the compressor motor 1, the outside air temperature sensor 51 for detecting the outside air temperature, and the temperature of the outdoor heat exchanger 8. For receiving the signals from various sensors such as the outdoor heat exchanger temperature sensor 52. Moreover, it connects to actuators, such as the compressor motor 1, the electric expansion valve 7, and the outdoor fan 9, and acquires data from these temperature information and the indoor control apparatus 31, and transmits a control signal to these.
圧縮機モータ制御手段２２は、圧縮機モータ１に通電すべき印加電圧を演算により算出し、この演算結果に基づきインバータ回路を介して圧縮機モータ１へ通電する。室外ファン制御手段２４は、室外ファン９に通電すべき印加電圧を演算により算出し、この演算結果に基づきインバータ回路を介して室外ファン９へ通電する。 The compressor motor control means 22 calculates an applied voltage to be supplied to the compressor motor 1 by calculation, and supplies the compressor motor 1 with electricity through an inverter circuit based on the calculation result. The outdoor fan control means 24 calculates an applied voltage to be applied to the outdoor fan 9 by calculation, and supplies the outdoor fan 9 with electricity through an inverter circuit based on the calculation result.
圧縮機モータ１の巻き線に所定値以上の電流が流れると圧縮機モータ１が減磁する。そのため、過電流保護手段２３は圧縮機モータ１の巻き線に流れる電流値を検出して、設定する閾値以上の場合は圧縮機モータ１の運転を停止する。なお、減磁する電流値は圧縮機モータ１の温度に応じて決まるため、温度に応じて閾値を変更してもよい。 When a current of a predetermined value or more flows through the winding of the compressor motor 1, the compressor motor 1 is demagnetized. For this reason, the overcurrent protection means 23 detects the value of the current flowing through the winding of the compressor motor 1 and stops the operation of the compressor motor 1 when the value is equal to or greater than a set threshold value. Since the current value to be demagnetized is determined according to the temperature of the compressor motor 1, the threshold value may be changed according to the temperature.
室外機冷却制御手段２５は過電流保護手段２３により停止した場合、室外ファン９の駆動を継続させるかを判断して室外ファン制御手段２４に指令を与える。 When the outdoor unit cooling control means 25 is stopped by the overcurrent protection means 23, the outdoor unit cooling control means 25 determines whether to continue driving the outdoor fan 9 and gives a command to the outdoor fan control means 24.
このように構成した空気調和機で、室内機を冷房運転した場合の動作の概要について説明する。 An outline of the operation when the indoor unit is air-cooled with the air conditioner configured as described above will be described.
リモコン４１から冷房運転開始信号を受信すると、室内制御装置３１は、受信した設定風速に従って室内ファン５を制御すると共に、冷房運転開始指令を室外制御装置２１に送信する。 When the cooling operation start signal is received from the remote controller 41, the indoor control device 31 controls the indoor fan 5 according to the received set wind speed and transmits a cooling operation start command to the outdoor control device 21.
室外制御装置２１は、室内制御装置３１から指令信号を受信すると、四方弁２を冷房サイクルに設定し、室外ファン９を所定の回転数で駆動し、電動膨張弁７を所定の運転用開度に絞り込む。更に、室内機Ａから受信した圧縮機モータ１の回転数指令値に基づいて圧縮機モータ１を回転させる。過電流保護手段２３は、圧縮機モータ１が回転を始めると巻き線に流れる電流を検出して設定する閾値との比較を常時実行する。 When the outdoor control device 21 receives a command signal from the indoor control device 31, the outdoor control device 21 sets the four-way valve 2 to the cooling cycle, drives the outdoor fan 9 at a predetermined rotational speed, and sets the electric expansion valve 7 to a predetermined operating opening. Refine to. Furthermore, the compressor motor 1 is rotated based on the rotation speed command value of the compressor motor 1 received from the indoor unit A. When the compressor motor 1 starts rotating, the overcurrent protection means 23 always executes a comparison with a threshold value set by detecting the current flowing through the winding.
次に、図２と図３を用いて空調制御を停止する動作について説明する。 Next, the operation | movement which stops air-conditioning control is demonstrated using FIG. 2 and FIG.
図２において、リモコン４１から運転停止信号を受信すると、室内制御装置３１は、室内ファン５を停止すると共に、運転停止指令を室外制御装置２１に送信する。 In FIG. 2, when an operation stop signal is received from the remote controller 41, the indoor control device 31 stops the indoor fan 5 and transmits an operation stop command to the outdoor control device 21.
室外制御装置２１は、室内制御装置３１から運転停止指令を受信すると、圧縮機モータ１の駆動を停止させると共に、室外ファン９を停止させる。更に一定時間経過後に電動膨張弁７を所定の開度にしてサイクルバランスを行う。 When receiving the operation stop command from the indoor control device 31, the outdoor control device 21 stops the driving of the compressor motor 1 and stops the outdoor fan 9. Furthermore, the cycle balance is performed by setting the electric expansion valve 7 to a predetermined opening after a predetermined time has elapsed.
図３は従来装置の空調制御のオンオフと、圧縮機モータ１の駆動状態と、圧縮機の吐出と吸込みの差圧と、室外ファン９の駆動状態とをタイミングチャートで示している。 FIG. 3 is a timing chart showing on / off of the air conditioning control of the conventional apparatus, the driving state of the compressor motor 1, the differential pressure between the discharge and suction of the compressor, and the driving state of the outdoor fan 9.
タイミングＴ１で空調制御がオンからオフになると圧縮機モータ１と室外ファン９を停止する。圧縮機の吐出と吸込みの差圧は、室外機周辺の空気が循環しやすい環境にあると、所定のサイクルバランス時間中に減圧できるため、再度タイミングＴ２で空調制御がオンとなった場合でも圧縮機モータ１は問題なく再起動することができる。 When the air conditioning control is turned off from on at timing T1, the compressor motor 1 and the outdoor fan 9 are stopped. The differential pressure between the discharge and suction of the compressor can be reduced during the specified cycle balance time if the air around the outdoor unit is easily circulated. Therefore, even if the air conditioning control is turned on again at the timing T2, the compression is performed. The machine motor 1 can be restarted without problems.
図２と図４のタイミングチャートを用いて本発明の特徴について説明する。図４は、室外機が周辺空気の循環しにくい設置環境であるため、圧縮機モータ１を再起動した際に過電流停止した場合のタイミングチャートである。 The features of the present invention will be described with reference to the timing charts of FIGS. FIG. 4 is a timing chart when the overcurrent is stopped when the compressor motor 1 is restarted because the outdoor unit is in an installation environment in which ambient air hardly circulates.
室外機周辺の空気が循環しにくい設置環境にあると、空調制御中の室外機周辺は高温となり、空調停止後も高温が続くため、室外熱交換器８内の冷媒の状態は高温高圧で維持される。このため、タイミングＴ３で空調制御をオフしてもサイクルバランス期間中に圧縮機の吐出と吸込みの差圧が低下しにくい。このような状況においてタイミングＴ４で圧縮機モータ１を再起動すると、起動負荷が大きく巻き線に流れる電流が増加するためタイミングＴ５で過電流停止に至る。 In an installation environment where the air around the outdoor unit is difficult to circulate, the area around the outdoor unit during air conditioning control becomes high temperature and continues to be high even after air conditioning is stopped. Is done. For this reason, even if the air-conditioning control is turned off at timing T3, the differential pressure between the discharge and suction of the compressor is unlikely to decrease during the cycle balance period. In such a situation, when the compressor motor 1 is restarted at timing T4, the starting load is large and the current flowing through the winding increases, so that overcurrent is stopped at timing T5.
また、Ｔ３からＴ４までのサイクルバランス期間が短い場合も、圧縮機の吐出と吸込みの差圧が十分低下しておらず、起動負荷が大きく巻き線に流れる電流が増加するためタイミングＴ５で過電流停止に至る。 Further, even when the cycle balance period from T3 to T4 is short, the differential pressure between the discharge and suction of the compressor is not sufficiently reduced, and the current flowing through the winding increases due to a large starting load, so an overcurrent occurs at timing T5. It leads to a stop.
圧縮機の吐出と吸込みの差圧が低下していない状態で再起動を行うと、吐出と吸込みの差圧による負荷が圧縮機に加わるため、圧縮機の回転数を増加させるのに必要となる負荷が増大し、過電流停止に至る。 When restarting in a state where the differential pressure between the discharge and suction of the compressor has not decreased, a load due to the differential pressure between the discharge and suction is applied to the compressor, which is necessary to increase the rotation speed of the compressor. The load increases and overcurrent stops.
過電流停止に至った場合、過電流停止情報は室内機Ａへ送信され、空調制御がオフされサイクルバランス期間が設けられる。室外機冷却制御手段２５は過電流保護手段２３より過電流停止の情報を受け取ると、室外機冷却タイマを設定する。室外ファン制御手段２４は、室外機冷却タイマの値が０秒になるまで室外ファン９を室外機強制冷却用の回転数で駆動して室外熱交換器８に通風する。これにより、Ｔ５からＴ６間のサイクルバランス期間で室外熱交換器８にある冷媒温度と圧力が低下して吐出と吸込みの圧力差を低下することができる。タイミングＴ６でサイクルバランス期間が終了すると空調制御がオンとなり、圧力差が低いため圧縮機モータ１を確実に起動することができる。 When the overcurrent stop is reached, the overcurrent stop information is transmitted to the indoor unit A, the air conditioning control is turned off, and the cycle balance period is provided. When the outdoor unit cooling control means 25 receives the overcurrent stop information from the overcurrent protection means 23, it sets an outdoor unit cooling timer. The outdoor fan control means 24 drives the outdoor fan 9 at the rotational speed for forced cooling of the outdoor unit until the value of the outdoor unit cooling timer reaches 0 seconds, and ventilates the outdoor heat exchanger 8. Accordingly, the refrigerant temperature and pressure in the outdoor heat exchanger 8 can be reduced during the cycle balance period from T5 to T6, and the pressure difference between discharge and suction can be reduced. When the cycle balance period ends at timing T6, the air conditioning control is turned on, and the compressor motor 1 can be reliably started because the pressure difference is low.
なお、Ｔ３からＴ４までのサイクルバランス期間が極端に短く、圧縮機の吐出と吸込みの差圧が低下していない場合、過電流停止に至ることが予測される。この場合に、タイミングＴ４で圧縮機モータ１を再起動する前に、Ｔ５からＴ６までのサイクルバランス期間を設けてもよい。圧縮機モータ１を再起動して過電流停止するまでの時間がないため、正常に起動するまでの時間を短くすることができる。 In addition, when the cycle balance period from T3 to T4 is extremely short and the differential pressure between the discharge and the suction of the compressor is not reduced, it is predicted that an overcurrent stop is reached. In this case, a cycle balance period from T5 to T6 may be provided before restarting the compressor motor 1 at the timing T4. Since there is no time until the compressor motor 1 is restarted and the overcurrent is stopped, the time until the compressor motor 1 is normally started can be shortened.
また、Ｔ５からＴ６までのサイクルバランス期間は一定時間としているが、Ｔ３からＴ４までのサイクルバランス期間、外気温度、又は、外気温度と室内温度との差に応じて変えてもよい。サイクルバランス期間を短縮でき、正常に起動するまでの時間を短くすることができる。 Moreover, although the cycle balance period from T5 to T6 is a fixed time, it may be changed according to the cycle balance period from T3 to T4, the outside air temperature, or the difference between the outside air temperature and the room temperature. The cycle balance period can be shortened, and the time until normal startup can be shortened.
次に制御プログラムのフローチャートについて説明する。図５に室外機冷却制御手段２５のフローチャートを示す。まず室外機冷却制御手段２５のステップＰ５１は圧縮機モータ１が過電流保護による停止かを判定する。過電流保護による停止でない場合はステップＰ５３へ進み、室外機冷却タイマに０秒を設定する。過電流保護の場合はステップＰ５２へ進み、室外機冷却タイマに室外熱交換器８を冷却するのに必要な室外ファン駆動時間を設定する。ステップＰ５４は、室外機冷却タイマが０秒の場合は終了し、０秒以外の場合はステップＰ５５へ進み、室外機冷却タイマの残時間を更新する。 Next, a flowchart of the control program will be described. FIG. 5 shows a flowchart of the outdoor unit cooling control means 25. First, in step P51 of the outdoor unit cooling control means 25, it is determined whether the compressor motor 1 is stopped due to overcurrent protection. If the stop is not due to overcurrent protection, the process proceeds to step P53, where 0 second is set in the outdoor unit cooling timer. In the case of overcurrent protection, the process proceeds to Step P52, and the outdoor fan driving time necessary for cooling the outdoor heat exchanger 8 is set in the outdoor unit cooling timer. Step P54 ends when the outdoor unit cooling timer is 0 seconds, otherwise proceeds to Step P55 and updates the remaining time of the outdoor unit cooling timer.
図６に室外ファン制御手段２４のフローチャートを示す。室外ファン制御手段２４は、ステップＰ６１にて室外機冷却制御手段２５で更新する室外機冷却タイマの値が０秒か否かを判定して、０秒の場合はステップＰ６２に進み室外ファン指令回転数に通常指令回転数を設定する。なお、通常指令回転数は室内制御装置３１より送信される指令回転数を基に室外制御装置２１で編集する値であり、空調制御オフ時は０回転となる。ステップＰ６１で室外機冷却タイマの値が０秒以外の場合は、ステップＰ６３へ進み室外ファン指令回転数に室外機冷却回転数をセットする。ステップＰ６４は室外ファン指令回転数が０回転か否かを判定して０回転の場合はステップＰ６５に進み室外ファン９を停止する。０回転以外の場合はステップＰ６６に進み室外ファン９の駆動を継続する。 FIG. 6 shows a flowchart of the outdoor fan control means 24. In step P61, the outdoor fan control means 24 determines whether or not the value of the outdoor unit cooling timer updated by the outdoor unit cooling control means 25 is 0 seconds. If it is 0 seconds, the process proceeds to step P62 and the outdoor fan command rotation is performed. Set the normal command speed to the number. The normal command rotational speed is a value edited by the outdoor control device 21 based on the command rotational speed transmitted from the indoor control device 31, and is 0 rotation when the air conditioning control is off. If the value of the outdoor unit cooling timer is other than 0 seconds in step P61, the process proceeds to step P63, where the outdoor unit cooling rotational speed is set as the outdoor fan command rotational speed. In step P64, it is determined whether or not the outdoor fan command rotational speed is zero. If the rotational speed is zero, the process proceeds to step P65 and the outdoor fan 9 is stopped. If the rotation is not zero, the process proceeds to Step P66 and the driving of the outdoor fan 9 is continued.
以上により、過電流停止した場合にはＰ６３にて室外ファン指令回転数に０回転以外である室外機冷却回転数が設定されるため、Ｐ６４の判定にてＰ６６へ進み室外ファンの駆動が継続される。 As described above, when the overcurrent is stopped, since the outdoor fan cooling rotation speed other than 0 rotation is set to the outdoor fan command rotation speed in P63, the process proceeds to P66 in the determination of P64 and the driving of the outdoor fan is continued. The
なお、ここまでリモコン４１で空調制御がオンオフされた場合における圧縮機モータ１の再起動について説明したが、リモコン４１の設定温度と室内温度の関係により圧縮機モータ１が停止し、再起動する場合の過電流停止についても同様である。 The restart of the compressor motor 1 when the air-conditioning control is turned on / off with the remote controller 41 has been described so far. However, the compressor motor 1 is stopped and restarted due to the relationship between the set temperature of the remote controller 41 and the room temperature. The same applies to the overcurrent stop.
なお、フェライト永久磁石を適用した圧縮機モータ１では低外気温度時などに起動する場合では、圧縮機の吐出と吸込みの差圧がなくても、モータ巻き線に流れる電流が閾値を超える場合もある。１度目に閾値を超えたときは圧縮機モータ１の運転を停止してサイクルバランス期間を設け、２度目に閾値を超えたときはサイクルバランス期間を設けることなく、圧縮機モータ１の回転数を低下、又は、加速度レートを抑える運転を行ってもよい。 In addition, in the compressor motor 1 to which the ferrite permanent magnet is applied, when starting at a low outside air temperature or the like, the current flowing through the motor winding may exceed the threshold even if there is no differential pressure between the discharge and suction of the compressor. is there. When the threshold value is exceeded for the first time, the operation of the compressor motor 1 is stopped and a cycle balance period is provided. When the threshold value is exceeded for the second time, the rotation number of the compressor motor 1 is set without providing a cycle balance period. You may perform the driving | operation which suppresses a fall or an acceleration rate.
以上、本発明の空気調和機は、圧縮機と、室外熱交換器と、室外熱交換器に外気を送る室外ファンと、室外制御装置と、を有する室外機と、室内機と、を備え、室外制御装置は、圧縮機を駆動する圧縮機モータに流れる電流値が設定した閾値を超えた場合に圧縮機モータを停止させる過電流保護手段、を有し、過電流保護手段によって圧縮機モータが停止した場合、室外ファンを設定時間駆動した後に圧縮機モータを駆動する。 As described above, the air conditioner of the present invention includes a compressor, an outdoor heat exchanger, an outdoor fan that sends outdoor air to the outdoor heat exchanger, and an outdoor control device, and an indoor unit. The outdoor control device has overcurrent protection means for stopping the compressor motor when the value of the current flowing through the compressor motor that drives the compressor exceeds a set threshold, and the compressor motor is stopped by the overcurrent protection means. When stopped, the compressor motor is driven after the outdoor fan is driven for a set time.
また、本発明の空気調和機は、運転停止指令、又は、サーモオフによって圧縮機モータが停止した場合、室外ファンを駆動する設定時間を設けずに圧縮機モータを駆動する。 Moreover, the air conditioner of this invention drives a compressor motor, without providing the set time which drives an outdoor fan, when a compressor motor stops by a driving | operation stop command or thermo-off.
また、本発明の空気調和機は、圧縮機モータの永久磁石はフェライト磁石である。 In the air conditioner of the present invention, the permanent magnet of the compressor motor is a ferrite magnet.
また、本発明の空気調和機は、圧縮機の温度に応じて閾値を変更する。 Moreover, the air conditioner of this invention changes a threshold value according to the temperature of a compressor.
本発明によれば、室外ファンによる冷却制御により圧縮機モータの再起動性を向上することができると共に、冷却制御の実行条件を過電流停止した場合に限定することで、室外ファンの駆動による騒音及び消費電力の増加を抑えることができる。また、室外機の設置環境による影響が無い場合は、差圧が原因で過電流保護により停止することは無いため、従来と同じ動作を行うことができ、前回までの差圧を有効に使用して空調制御を再開することができる。 According to the present invention, the restartability of the compressor motor can be improved by the cooling control by the outdoor fan, and the noise caused by the driving of the outdoor fan can be limited by limiting the execution condition of the cooling control to the case where the overcurrent is stopped. In addition, an increase in power consumption can be suppressed. In addition, if there is no influence from the outdoor unit installation environment, it will not stop due to overcurrent protection due to differential pressure, so the same operation as before can be performed, and the differential pressure up to the previous time can be used effectively. Air conditioning control can be resumed.
１ 圧縮機モータ
２ 四方弁
３ ガス側配管接続バルブ
４ 室内熱交換器
５ 室内ファン
６ 液側配管接続バルブ
７ 電動膨張弁
８ 室外熱交換器
９ 室外ファン
１０ ガス側配管
１１ 液側配管
２１ 室外制御装置
２２ 圧縮機モータ制御手段
２３ 過電流保護手段
２４ 室外ファン制御手段
２５ 室外機冷却制御手段
３１ 室内制御装置
４１ リモコン
５１ 外気温度センサ
５２ 室外熱交換器温度センサ
５３ 冷媒吐出温度センサ
６１ データ伝送線
Ａ 室内機
Ｃ 室外機
DESCRIPTION OF SYMBOLS 1 Compressor motor 2 Four-way valve 3 Gas side piping connection valve 4 Indoor heat exchanger 5 Indoor fan 6 Liquid side piping connection valve 7 Electric expansion valve 8 Outdoor heat exchanger 9 Outdoor fan 10 Gas side piping 11 Liquid side piping 21 Outdoor control Device 22 Compressor motor control means 23 Overcurrent protection means 24 Outdoor fan control means 25 Outdoor unit cooling control means 31 Indoor control device 41 Remote control 51 Outdoor temperature sensor 52 Outdoor heat exchanger temperature sensor 53 Refrigerant discharge temperature sensor 61 Data transmission line A Indoor unit C Outdoor unit
Claims (4)
前記室外制御装置は、前記圧縮機を駆動する圧縮機モータに流れる電流値が設定した閾値を超えた場合に前記圧縮機モータを停止させる過電流保護手段、を有し、
１度目に前記過電流保護手段によって前記圧縮機モータが停止した場合、前記室外ファンを設定時間駆動した後に前記圧縮機モータを駆動し、
２度目に前記過電流保護手段によって前記圧縮機モータが停止した場合、前記室外ファンを駆動する設定時間を設けずに前記圧縮機モータの回転数を低下、又は、加速度レートを抑える運転を行う空気調和機。 An outdoor unit having a compressor, an outdoor heat exchanger, an outdoor fan that sends outside air to the outdoor heat exchanger, and an outdoor control device, and an indoor unit,
The outdoor control device has overcurrent protection means for stopping the compressor motor when a current value flowing through the compressor motor that drives the compressor exceeds a set threshold value,
When the compressor motor is stopped by the overcurrent protection means for the first time, the compressor motor is driven after driving the outdoor fan for a set time,
When the compressor motor is stopped by the overcurrent protection means for the second time, air that performs an operation for reducing the rotation speed of the compressor motor or suppressing the acceleration rate without providing a set time for driving the outdoor fan. Harmony machine.
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