JP2019020093A - Air conditioner - Google Patents

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JP2019020093A
JP2019020093A JP2017141473A JP2017141473A JP2019020093A JP 2019020093 A JP2019020093 A JP 2019020093A JP 2017141473 A JP2017141473 A JP 2017141473A JP 2017141473 A JP2017141473 A JP 2017141473A JP 2019020093 A JP2019020093 A JP 2019020093A
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heat exchanger
temperature
compressor
lower limit
determination value
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JP6650567B2 (en
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充博 鎌田
Mitsuhiro Kamata
充博 鎌田
貴之 井関
Takayuki Izeki
貴之 井関
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Panasonic Intellectual Property Management Co Ltd
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Abstract

To solve the problem that in a case where a compressor operates when an outdoor temperature is low, and a refrigerant stagnation phenomenon or uneven distribution of refrigerant still occurs, transient reduction of a refrigerant circulation amount occurs, and therefor the compressor cannot be protected quickly.SOLUTION: An air conditioner is configured to: set a first determination value for determining whether an outside air temperature belongs to a predetermined low-temperature range, and a second determination value for determining whether the difference between the outside air temperature and a temperature at a heat exchanger outlet of an outdoor heat exchanger belongs to a certain range; when the outside air temperature is not larger than the first determination value and the difference between the outside air temperature and the temperature at the heat exchanger outlet is not larger than the second determination value, correct a lower limit value of a compressor frequency; and set a preset lower limit value of the compressor frequency to a target lower limit value.SELECTED DRAWING: Figure 1

Description

本発明は、空気調和機の圧縮機保護制御に関するものである。   The present invention relates to compressor protection control for an air conditioner.

室外温度が低く凝縮機の負荷が低いときに、冷媒の寝込み現象又は冷媒の偏在が発生する場合がある。この現象を液封と呼び、この液封が発生したまま圧縮機を運転した場合、過渡的な冷媒循環量の低下が生じる。特許文献１に記載の空気調和機は、圧縮機外郭温度が異常上昇した場合、冷媒循環量の低下と判定し、冷媒流量に基づいて圧縮機周波数の下限値を上げる。よって、過渡的に冷媒循環量が低下した場合であっても圧縮機の不具合を回避していた。   When the outdoor temperature is low and the load on the condenser is low, the refrigerant stagnation phenomenon or the uneven distribution of the refrigerant may occur. This phenomenon is called liquid sealing, and when the compressor is operated with this liquid sealing occurring, a transient decrease in the refrigerant circulation rate occurs. The air conditioner described in Patent Literature 1 determines that the refrigerant circulation amount is decreased when the compressor outer temperature is abnormally increased, and increases the lower limit value of the compressor frequency based on the refrigerant flow rate. Therefore, even if the refrigerant circulation amount is transiently reduced, the problem of the compressor is avoided.

特許第５９４３８６９号Japanese Patent No. 5934869

しかしながら、過渡的な冷媒循環量が低下した場合、圧縮機外郭温度が上昇するまでに遅れ時間が発生する。また、圧縮機外郭温度が上昇するまでにかかる時間は、圧縮機本体の大きさが大きいほど時間が長くなる傾向にあり、圧縮機を迅速に保護できないという課題があった。   However, when the transient refrigerant circulation amount decreases, a delay time occurs until the compressor outer temperature rises. Further, the time required for the compressor outer temperature to rise tends to increase as the size of the compressor body increases, and there is a problem that the compressor cannot be protected quickly.

本発明に係る空気調和機は、圧縮機、室内熱交換器、膨張装置、及び室外熱交換器が冷媒配管で接続された空気調和機であって、前記圧縮機の圧縮機周波数を制御する制御部と、を備え、前記制御部は、外気温度が予め定めた低温範囲に属するか否かを判定する第１判定値と、前記室外熱交換器の熱交換器出口温度と外気温度との差がある範囲に属するか否かを判定する第２判定値とが設定され、前記外気温度が第１判定値以下であって、前記熱交換器出口温度と外気温度の差が第２判定値以下の場合、前記圧縮機周波数の下限値を補正し、予め設定されている前記圧縮機周波数の下限値を目標下限値にするものである。   An air conditioner according to the present invention is an air conditioner in which a compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger are connected by a refrigerant pipe, and controls the compressor frequency of the compressor. A difference between the first determination value for determining whether or not the outside air temperature belongs to a predetermined low temperature range, and the heat exchanger outlet temperature of the outdoor heat exchanger and the outside air temperature. And a second determination value for determining whether or not the temperature falls within a certain range, the outside air temperature is equal to or less than the first determination value, and a difference between the heat exchanger outlet temperature and the outside air temperature is equal to or less than the second determination value. In this case, the lower limit value of the compressor frequency is corrected to set the preset lower limit value of the compressor frequency to the target lower limit value.

本発明は、外気温度と熱交換器温度により液封による冷媒循環量低下を迅速に検知することで、圧縮機周波数の下限値を上げる。よって、過渡的に冷媒循環量が低下した場合であっても圧縮機の不具合を回避し、信頼性向上の効果が得られる。   The present invention raises the lower limit value of the compressor frequency by quickly detecting a decrease in the amount of refrigerant circulation due to liquid sealing based on the outside air temperature and the heat exchanger temperature. Therefore, even when the refrigerant circulation amount is transiently reduced, the problem of the compressor can be avoided and the effect of improving the reliability can be obtained.

本発明の実施の形態における冷凍サイクル図Refrigeration cycle diagram in the embodiment of the present invention 本発明の実施の形態１における制御フローチャートControl flowchart according to Embodiment 1 of the present invention 本発明の実施の形態２における制御フローチャートControl flowchart in Embodiment 2 of the present invention 本発明の実施の形態３における制御フローチャートControl flowchart in Embodiment 3 of the present invention 本発明の実施の形態４における制御フローチャートControl flowchart according to Embodiment 4 of the present invention

第１の発明は、圧縮機、室内熱交換器、膨張装置、及び室外熱交換器が冷媒配管で接続された空気調和機であって、前記圧縮機の圧縮機周波数を制御する制御部を備え、前記制御部は、外気温度が予め定めた低温範囲に属するか否かを判定する第１判定値と、前記室
外熱交換器の熱交換器出口温度と外気温度との差がある範囲に属するか否かを判定する第２判定値、前記圧縮機周波数の下限値とを有し、前記外気温度が第１判定値以下であって、前記熱交換器出口温度と外気温度の差が第２判定値以下の場合、前記圧縮機周波数の前記下限値を補正し、予め設定されている前記圧縮機周波数の下限値を目標下限値にすることにより、過渡的に冷媒循環量が低下した場合であっても圧縮機の不具合を回避し、信頼性を向上するという効果を得ることが出来る。 A first invention is an air conditioner in which a compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger are connected by a refrigerant pipe, and includes a control unit that controls the compressor frequency of the compressor. The control unit belongs to a range in which there is a difference between the first determination value for determining whether or not the outside air temperature belongs to a predetermined low temperature range and the heat exchanger outlet temperature of the outdoor heat exchanger and the outside air temperature. And a lower limit value of the compressor frequency, the outside air temperature is equal to or lower than the first judgment value, and a difference between the heat exchanger outlet temperature and the outside air temperature is a second value. In the case where the refrigerant circulation amount is transiently decreased by correcting the lower limit value of the compressor frequency and setting the preset lower limit value of the compressor frequency to the target lower limit value when the value is equal to or less than the determination value. Even if there is, it is possible to avoid the malfunction of the compressor and improve the reliability. Door can be.

第２の発明は、圧縮機、室内熱交換器、膨張装置、及び室外熱交換器が冷媒配管で接続された空気調和機であって、前記圧縮機の圧縮機周波数を制御する制御部を備え、前記制御部は、外気温度が予め定めた低温範囲に属するか否かを判定する第１判定値と、前記室外熱交換器の熱交換器温度と外気温度との差がある範囲に属するか否かを判定する第２判定値と前記圧縮機周波数の下限値とを有し、前記外気温度が第１判定値以下であって、前記熱交換器温度と外気温度の差が第２判定値以下の場合、前記圧縮機周波数の前記下限値を補正し、予め設定されている前記圧縮機周波数の下限値を目標下限値にすることにより、過渡的に冷媒循環量が低下した場合であっても圧縮機の不具合を回避し、信頼性を向上するという効果を得ることが出来る。   A second invention is an air conditioner in which a compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger are connected by a refrigerant pipe, and includes a controller that controls the compressor frequency of the compressor. The control unit is in a range where there is a difference between the first determination value for determining whether or not the outside air temperature is in a predetermined low temperature range and the heat exchanger temperature of the outdoor heat exchanger and the outside air temperature. A second determination value for determining whether or not and a lower limit value of the compressor frequency, wherein the outside air temperature is equal to or lower than the first determination value, and a difference between the heat exchanger temperature and the outside air temperature is a second determination value. In the following cases, the refrigerant circulation amount is transiently reduced by correcting the lower limit value of the compressor frequency and setting the preset lower limit value of the compressor frequency to a target lower limit value. However, it is also possible to obtain the effect of avoiding compressor problems and improving reliability. That.

第３の発明は、圧縮機、室内熱交換器、膨張装置、及び室外熱交換器が冷媒配管で接続された空気調和機であって、前記圧縮機の圧縮機周波数を制御する制御部を備え、前記制御部は、室内吸込み温度が予め定めた低温範囲に属するか否かを判定する第１判定値と、前記室内熱交換器の熱交換器出口温度と室内吸込み温度との差がある範囲に属するか否かを判定する第２判定値と前記圧縮機周波数の下限値とを有し、前記室内吸込み温度が第１判定値以下であって、前記熱交換器出口温度と室内吸込み温度の差が第２判定値以下の場合、前記圧縮機周波数の前記下限値を補正し、予め設定されている前記圧縮機周波数の下限値を目標下限値にすることにより、過渡的に冷媒循環量が低下した場合であっても圧縮機の不具合を回避し、信頼性を向上するという効果を得ることが出来る。   A third invention is an air conditioner in which a compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger are connected by a refrigerant pipe, and includes a control unit that controls the compressor frequency of the compressor. The control unit has a difference between the first determination value for determining whether or not the indoor suction temperature belongs to a predetermined low temperature range, and the heat exchanger outlet temperature of the indoor heat exchanger and the indoor suction temperature. And the lower limit value of the compressor frequency, the indoor suction temperature is equal to or lower than the first determination value, and the heat exchanger outlet temperature and the indoor suction temperature are When the difference is equal to or less than the second determination value, the refrigerant circulation amount is transiently adjusted by correcting the lower limit value of the compressor frequency and setting the preset lower limit value of the compressor frequency to the target lower limit value. Even if it drops, it avoids compressor problems and increases reliability. It is possible to obtain the effect of the above.

第４の発明は、圧縮機、室内熱交換器、膨張装置、及び室外熱交換器が冷媒配管で接続された空気調和機であって、前記圧縮機の圧縮機周波数を制御する制御部と、を備え、前記制御部は、室内吸込み温度が予め定めた低温範囲に属するか否かを判定する第１判定値と、前記室内熱交換器の熱交換器温度と室内吸込み温度との差がある範囲に属するか否かを判定する第２判定値と前記圧縮機周波数の下限値とを有し、前記室内吸込み温度が第１判定値以下であって、前記熱交換器温度と室内吸込み温度の差が第２判定値以下の場合、前記圧縮機周波数の前記下限値を補正し、予め設定されている前記圧縮機周波数の下限値を目標下限値にすることにより、過渡的に冷媒循環量が低下した場合であっても圧縮機の不具合を回避し、信頼性を向上するという効果を得ることが出来る。   A fourth invention is an air conditioner in which a compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger are connected by a refrigerant pipe, and a control unit that controls the compressor frequency of the compressor; The control unit has a difference between a first determination value for determining whether or not the indoor suction temperature belongs to a predetermined low temperature range, and the heat exchanger temperature of the indoor heat exchanger and the indoor suction temperature A second determination value for determining whether or not it belongs to a range and a lower limit value of the compressor frequency, wherein the indoor suction temperature is equal to or lower than the first determination value, and the heat exchanger temperature and the indoor suction temperature are When the difference is equal to or less than the second determination value, the refrigerant circulation amount is transiently adjusted by correcting the lower limit value of the compressor frequency and setting the preset lower limit value of the compressor frequency to the target lower limit value. Improves reliability by avoiding compressor troubles even if it drops Effect can be obtained as that.

以下、本発明の実施の形態について、図面を用いて詳細に説明する。尚、実施の形態１〜４は単独で実施されてもよく、組み合わせて実施されてもよい。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, Embodiment 1-4 may be implemented independently and may be implemented in combination.

（実施の形態１）
図１は、本発明の実施の形態１における空気調和機の冷凍サイクル図の一例であり、図２は制御フローチャートである。 (Embodiment 1)
FIG. 1 is an example of a refrigeration cycle diagram of an air conditioner according to Embodiment 1 of the present invention, and FIG. 2 is a control flowchart.

図１において、室外機１にはインバータ駆動の容量（周波数）可変形圧縮機２（以下単に圧縮機２と称す）と、室外熱交換器３と室外送風機４と、冷暖房切換用の四方弁５と例えばステッピングモータ等により弁開度をパルス制御可能な電子膨張弁６が設けられる。室外機１は、外気温度センサー７と、室外熱交換器温度センサー８と、室外熱交換器出口温度センサー９を備えている。また、室外機１は制御部２０を備えている。   In FIG. 1, an outdoor unit 1 includes an inverter-driven capacity (frequency) variable compressor 2 (hereinafter simply referred to as a compressor 2), an outdoor heat exchanger 3, an outdoor blower 4, and a four-way valve 5 for switching between cooling and heating. For example, an electronic expansion valve 6 capable of pulse-controlling the valve opening degree by a stepping motor or the like is provided. The outdoor unit 1 includes an outdoor air temperature sensor 7, an outdoor heat exchanger temperature sensor 8, and an outdoor heat exchanger outlet temperature sensor 9. The outdoor unit 1 includes a control unit 20.

一方、室内機１０には室内送風機１１と、室内熱交換器１２がそれぞれ設けられていて、室外機１と室内機１０は接続配管により液側配管１７とガス側配管１８で接続されている。室内機１０は、室内吸込み温度センサー１４と、室内熱交換器温度センサー１５と、室内熱交換器出口温度センサー１６を備えている。   On the other hand, the indoor unit 10 is provided with an indoor blower 11 and an indoor heat exchanger 12, and the outdoor unit 1 and the indoor unit 10 are connected to each other by a liquid pipe 17 and a gas side pipe 18 through a connection pipe. The indoor unit 10 includes an indoor suction temperature sensor 14, an indoor heat exchanger temperature sensor 15, and an indoor heat exchanger outlet temperature sensor 16.

また、室内機１０には、居住者が希望する運転モード（冷房、除湿または暖房）と室温と運転あるいは停止を設定できる運転設定装置１３が設けられている。   In addition, the indoor unit 10 is provided with an operation setting device 13 that can set an operation mode (cooling, dehumidification or heating) desired by a resident, room temperature, and operation or stop.

上記構成の冷凍サイクルにおいて、冷房あるいは除湿運転時は、圧縮機２から吐出された冷媒は四方弁５を介して室外熱交換器３へと流れ、室外送風機４の駆動により室外熱交換器３で室外空気と熱交換して凝縮液化し、電子膨張弁６で冷媒を流量制御して液側配管１７を通り、室内熱交換器１２で蒸発した後に、ガス側配管１８、四方弁５を介して再び圧縮機２に吸入される。この電子膨張弁６は室内の負荷に見合った開度となるようにステッピングモータ等によりパルス制御されるため、冷媒も室内負荷に応じた流量で制御される。   In the refrigeration cycle having the above configuration, during cooling or dehumidifying operation, the refrigerant discharged from the compressor 2 flows to the outdoor heat exchanger 3 through the four-way valve 5, and is driven by the outdoor heat exchanger 3 by driving the outdoor blower 4. Heat exchanges with the outdoor air to condense and liquefy the refrigerant, and the electronic expansion valve 6 controls the flow rate of the refrigerant, passes through the liquid side pipe 17 and evaporates in the indoor heat exchanger 12. It is sucked into the compressor 2 again. Since this electronic expansion valve 6 is pulse-controlled by a stepping motor or the like so as to have an opening corresponding to the load in the room, the refrigerant is also controlled at a flow rate according to the room load.

一方、暖房運転時は、圧縮機２から吐出された冷媒は四方弁５を介して室内熱交換器１２，へと流れ、室内送風機１１の駆動により室内熱交換器１２で室内空気と熱交換して凝縮液化し、電子膨張弁６で流量制御され、室外熱交換器３で蒸発した後に四方弁５を介して再び圧縮機２に吸入される。   On the other hand, during the heating operation, the refrigerant discharged from the compressor 2 flows to the indoor heat exchanger 12 through the four-way valve 5, and exchanges heat with indoor air in the indoor heat exchanger 12 by driving the indoor blower 11. The liquid is condensed and liquefied, the flow rate is controlled by the electronic expansion valve 6, evaporated by the outdoor heat exchanger 3, and then sucked into the compressor 2 again through the four-way valve 5.

尚、上記で説明した冷媒回路は、構成例を説明しただけであり、特にこれらに限定しない。   In addition, the refrigerant circuit demonstrated above is only demonstrated the structural example, It does not specifically limit to these.

次に、制御部２０の概要について説明する。制御部２０は、各種センサーの検知結果を取得し、圧縮機２の圧縮機周波数、電子膨張弁６、室外送風機４、室内送風機１１等を制御する。   Next, an outline of the control unit 20 will be described. The control unit 20 acquires detection results of various sensors, and controls the compressor frequency of the compressor 2, the electronic expansion valve 6, the outdoor blower 4, the indoor blower 11, and the like.

次に、本発明の制御の流れについて図２を用いて説明する。
本発明の空気調和機が冷房運転を開始後に、図２の圧縮機下限周波数補正処理が開始され、空気調和機が停止するまで処理が繰り返し実行される。
（ステップＳ２）
制御部２０は、室外吸込み温度データを取得する。
（ステップＳ３）
制御部２０は、低外気温度であるかの判定を行う。具体的にはステップＳ２にて取得した室外吸込み温度データが低外気温度判定値以下であるか否かを判定する。制御部２０は室外吸込み温度が低外気温度と判定した場合、ステップＳ４に進む。一方、制御部２０は室外吸込み温度が低外気温度ではなかった場合、ステップＳ２に戻る。
（ステップＳ４）
制御部２０は、室外熱交換器出口温度データを取得する。
（ステップＳ５）
制御部２０は、液封が発生していないか判定を行う。具体的にはステップＳ２、ステップＳ４にて取得した室外吸込み温度データと室外熱交換器出口温度データを利用し判定を行い、室外熱交換器出口温度データと室外吸込み温度データの差がある判定値以下であるか否かを演算し、判定値以下である場合、液封が発生していると判定する。液封が発生していると判定された場合、ステップＳ６に進む。一方、液封が発生していると判定されなかった場合、ステップＳ２に戻る。
（ステップＳ６）
制御部２０はステップＳ５にて液封が発生していると判定された場合、圧縮機下限周波数の補正を行う。現在の圧縮機下限周波数にある補正値を加算し、その値を圧縮機下限周波
数に置き換える。その後、ステップＳ２に戻り、圧縮機下限周波数補正処理を繰り返す。 Next, the control flow of the present invention will be described with reference to FIG.
After the air conditioner of the present invention starts the cooling operation, the compressor lower limit frequency correction process of FIG. 2 is started, and the process is repeatedly executed until the air conditioner stops.
(Step S2)
The control unit 20 acquires outdoor suction temperature data.
(Step S3)
The control unit 20 determines whether or not the outside air temperature is low. Specifically, it is determined whether or not the outdoor intake temperature data acquired in step S2 is equal to or lower than the low outdoor air temperature determination value. When the control unit 20 determines that the outdoor suction temperature is the low outside air temperature, the control unit 20 proceeds to step S4. On the other hand, when the outdoor suction temperature is not the low outdoor temperature, the control unit 20 returns to step S2.
(Step S4)
The control unit 20 acquires outdoor heat exchanger outlet temperature data.
(Step S5)
The control unit 20 determines whether a liquid seal has occurred. Specifically, determination is performed using the outdoor suction temperature data and the outdoor heat exchanger outlet temperature data acquired in Steps S2 and S4, and a determination value having a difference between the outdoor heat exchanger outlet temperature data and the outdoor suction temperature data. It is determined whether or not the liquid seal has occurred when the value is equal to or less than the determination value. When it is determined that liquid sealing has occurred, the process proceeds to step S6. On the other hand, if it is not determined that liquid sealing has occurred, the process returns to step S2.
(Step S6)
When it is determined in step S5 that liquid sealing has occurred, the controller 20 corrects the compressor lower limit frequency. The correction value at the current compressor lower limit frequency is added, and the value is replaced with the compressor lower limit frequency. Then, it returns to step S2 and repeats a compressor lower limit frequency correction process.

このように液封に起因する冷媒循環量低下を迅速に検知することで、圧縮機周波数の下限値を上げる。よって、過渡的に冷媒循環量が低下した場合であっても圧縮機の不具合を回避し、信頼性向上の効果が得られる。   Thus, the lower limit value of the compressor frequency is increased by rapidly detecting the decrease in the circulation amount of the refrigerant due to the liquid seal. Therefore, even when the refrigerant circulation amount is transiently reduced, the problem of the compressor can be avoided and the effect of improving the reliability can be obtained.

（実施の形態２）
本発明の制御の流れについて図３を用いて説明する。
本発明の空気調和機が冷房運転を開始後に、図３の圧縮機下限周波数補正処理が開始され、空気調和機が停止するまで処理が繰り返し実行される。
（ステップＳ２）
制御部２０は、外気温度データを取得する。
（ステップＳ３）
制御部２０は、低外気温度であるかの判定を行う。具体的にはステップＳ２にて取得した室外吸込み温度データが外気温度判定値以下であるか否かを判定する。制御部２０は室外吸込み温度が低外気温度と判定した場合、ステップＳ４に進む。一方、制御部２０は室外吸込み温度が低外気温度ではなかった場合、ステップＳ２に戻る。
（ステップＳ４）
制御部２０は、室外熱交換器温度データを取得する。
（ステップＳ５）
制御部２０は、液封が発生していないか判定を行う。具体的にはステップＳ２、ステップＳ４にて取得した室外吸込み温度データと室外熱交換器温度データを利用し判定を行い、室外熱交換器温度データと室外吸込み温度データの差がある判定値以下であるか否かを演算し、判定値以下である場合、液封が発生していると判定する。液封が発生していると判定された場合、ステップＳ６に進む。一方、液封が発生していると判定されなかった場合、ステップＳ２に戻る。
（ステップＳ６）
制御部２０はステップＳ５にて液封が発生していると判定された場合、圧縮機下限周波数の補正を行う。現在の圧縮機下限周波数にある補正値を加算し、その値を圧縮機下限周波数に置き換える。その後、ステップＳ２に戻り、圧縮機下限周波数補正処理を繰り返す。 (Embodiment 2)
The control flow of the present invention will be described with reference to FIG.
After the air conditioner of the present invention starts the cooling operation, the compressor lower limit frequency correction process of FIG. 3 is started, and the process is repeatedly executed until the air conditioner stops.
(Step S2)
The control unit 20 acquires outside air temperature data.
(Step S3)
The control unit 20 determines whether or not the outside air temperature is low. Specifically, it is determined whether or not the outdoor intake temperature data acquired in step S2 is equal to or less than the outdoor temperature determination value. When the control unit 20 determines that the outdoor suction temperature is the low outside air temperature, the control unit 20 proceeds to step S4. On the other hand, when the outdoor suction temperature is not the low outdoor temperature, the control unit 20 returns to step S2.
(Step S4)
The control unit 20 acquires outdoor heat exchanger temperature data.
(Step S5)
The control unit 20 determines whether a liquid seal has occurred. Specifically, the determination is made using the outdoor suction temperature data and the outdoor heat exchanger temperature data acquired in step S2 and step S4, and the difference between the outdoor heat exchanger temperature data and the outdoor suction temperature data is less than a determination value. It is determined whether or not there is a liquid seal when it is less than or equal to a determination value. When it is determined that liquid sealing has occurred, the process proceeds to step S6. On the other hand, if it is not determined that liquid sealing has occurred, the process returns to step S2.
(Step S6)
When it is determined in step S5 that liquid sealing has occurred, the controller 20 corrects the compressor lower limit frequency. The correction value at the current compressor lower limit frequency is added, and the value is replaced with the compressor lower limit frequency. Then, it returns to step S2 and repeats a compressor lower limit frequency correction process.

（実施の形態３）
本発明の制御の流れについて図４を用いて説明する。
本発明の空気調和機が暖房運転を開始後に、図４の圧縮機下限周波数補正処理が開始され、空気調和機が停止するまで処理が繰り返し実行される。
（ステップＳ２）
制御部２０は、室内吸込み温度データを取得する。
（ステップＳ３）
制御部２０は、低内気温度であるかの判定を行う。具体的にはステップＳ２にて取得した室内吸込み温度データが室内吸込み温度判定値以下であるか否かを判定する。制御部２０は室内吸込み温度が低内気温度と判定した場合、ステップＳ４に進む。一方、制御部２０は室内吸込み温度が低内気温度ではなかった場合、ステップＳ２に戻る。
（ステップＳ４）
制御部２０は、室内熱交換器出口温度データを取得する。
（ステップＳ５）
制御部２０は、液封が発生していないか判定を行う。具体的にはステップＳ２、ステップＳ４にて取得した室内吸込み温度データと室内熱交換器出口温度データを利用し判定を行い、室内熱交換器出口温度データと室内吸込み温度データの差がある判定値以下であるか否かを演算し、判定値以下である場合、液封が発生していると判定する。液封が発生していると判定された場合、ステップＳ６に進む。一方、液封が発生していると判定されなか
った場合、ステップＳ２に戻る。
（ステップＳ６）
制御部２０はステップＳ５にて液封が発生していると判定された場合、圧縮機下限周波数の補正を行う。現在の圧縮機下限周波数にある補正値を加算し、その値を圧縮機下限周波数に置き換える。その後、ステップＳ２に戻り、圧縮機下限周波数補正処理を繰り返す。 (Embodiment 3)
The control flow of the present invention will be described with reference to FIG.
After the air conditioner of the present invention starts the heating operation, the compressor lower limit frequency correction process of FIG. 4 is started, and the process is repeatedly executed until the air conditioner stops.
(Step S2)
The control unit 20 acquires indoor suction temperature data.
(Step S3)
The control unit 20 determines whether or not the inside air temperature is low. Specifically, it is determined whether or not the indoor suction temperature data acquired in step S2 is equal to or less than the indoor suction temperature determination value. When the controller 20 determines that the room intake temperature is the low room temperature, the process proceeds to step S4. On the other hand, when the indoor suction temperature is not the low room temperature, the control unit 20 returns to step S2.
(Step S4)
The control unit 20 acquires indoor heat exchanger outlet temperature data.
(Step S5)
The control unit 20 determines whether a liquid seal has occurred. Specifically, the determination is made using the indoor suction temperature data and the indoor heat exchanger outlet temperature data acquired in step S2 and step S4, and there is a determination value that has a difference between the indoor heat exchanger outlet temperature data and the indoor suction temperature data. It is determined whether or not the liquid seal has occurred when the value is equal to or less than the determination value. When it is determined that liquid sealing has occurred, the process proceeds to step S6. On the other hand, if it is not determined that liquid sealing has occurred, the process returns to step S2.
(Step S6)
When it is determined in step S5 that liquid sealing has occurred, the controller 20 corrects the compressor lower limit frequency. The correction value at the current compressor lower limit frequency is added, and the value is replaced with the compressor lower limit frequency. Then, it returns to step S2 and repeats a compressor lower limit frequency correction process.

（実施の形態４）
本発明の制御の流れについて図５を用いて説明する。
本発明の空気調和機が暖房運転を開始後に、図５の圧縮機下限周波数補正処理が開始され、空気調和機が停止するまで処理が繰り返し実行される。
（ステップＳ２）
制御部２０は、室内吸込み温度データを取得する。
（ステップＳ３）
制御部２０は、低内気温度であるかの判定を行う。具体的にはステップＳ２にて取得した室内吸込み温度データが室内吸込み温度判定値以下であるか否かを判定する。制御部２０は室内吸込み温度が低内気温度と判定した場合、ステップＳ４に進む。一方、制御部２０は室内吸込み温度が低内気温度ではなかった場合、ステップＳ２に戻る。
（ステップＳ４）
制御部２０は、室内熱交換器温度データを取得する。
（ステップＳ５）
制御部２０は、液封が発生していないか判定を行う。具体的にはステップＳ２、ステップＳ４にて取得した室内吸込み温度データと室内熱交換器温度データを利用し判定を行い、室内熱交換器温度データと室内吸込み温度データの差がある判定値以下であるか否かを演算し、判定値以下である場合、液封が発生していると判定する。液封が発生していると判定された場合、ステップＳ６に進む。一方、液封が発生していると判定されなかった場合、ステップＳ２に戻る。
（ステップＳ６）
制御部２０はステップＳ５にて液封が発生していると判定された場合、圧縮機下限周波数の補正を行う。現在の圧縮機下限周波数にある補正値を加算し、その値を圧縮機下限周波数に置き換える。その後、ステップＳ２に戻り、圧縮機下限周波数補正処理を繰り返す。 (Embodiment 4)
The control flow of the present invention will be described with reference to FIG.
After the air conditioner of the present invention starts the heating operation, the compressor lower limit frequency correction process of FIG. 5 is started, and the process is repeatedly executed until the air conditioner stops.
(Step S2)
The control unit 20 acquires indoor suction temperature data.
(Step S3)
The control unit 20 determines whether or not the inside air temperature is low. Specifically, it is determined whether or not the indoor suction temperature data acquired in step S2 is equal to or less than the indoor suction temperature determination value. When the controller 20 determines that the room intake temperature is the low room temperature, the process proceeds to step S4. On the other hand, when the indoor suction temperature is not the low room temperature, the control unit 20 returns to step S2.
(Step S4)
The control unit 20 acquires indoor heat exchanger temperature data.
(Step S5)
The control unit 20 determines whether a liquid seal has occurred. Specifically, the determination is made using the indoor suction temperature data and the indoor heat exchanger temperature data acquired in step S2 and step S4, and the difference between the indoor heat exchanger temperature data and the indoor suction temperature data is less than a determination value. It is determined whether or not there is a liquid seal when it is less than or equal to a determination value. When it is determined that liquid sealing has occurred, the process proceeds to step S6. On the other hand, if it is not determined that liquid sealing has occurred, the process returns to step S2.
(Step S6)
When it is determined in step S5 that liquid sealing has occurred, the controller 20 corrects the compressor lower limit frequency. The correction value at the current compressor lower limit frequency is added, and the value is replaced with the compressor lower limit frequency. Then, it returns to step S2 and repeats a compressor lower limit frequency correction process.

以上のように、本発明にかかる空気調和機は、吸込み温度と熱交換器温度により冷媒循環量低下を迅速に検知することで、圧縮機周波数の下限値を上げる。よって、過渡的に冷媒循環量が低下した場合であっても圧縮機の不具合を回避し、信頼性向上の効果が得られため、種々の空気調和機に適用できる。   As described above, the air conditioner according to the present invention increases the lower limit value of the compressor frequency by rapidly detecting the refrigerant circulation rate drop based on the suction temperature and the heat exchanger temperature. Therefore, even if the refrigerant circulation amount is transiently reduced, problems of the compressor can be avoided and the effect of improving the reliability can be obtained, so that the present invention can be applied to various air conditioners.

１ 室外機
２ 圧縮機
３ 室外熱交換器
４ 室外送風機
５ 四方弁
６ 電子膨張弁
７ 外気温度センサー
８ 室外熱交換器温度センサー
９ 室外熱交換器出口温度センサー
１０ 室内機
１１ 室内送風機
１２ 室内熱交換器
１３ 運転設定装置
１４ 室内吸い込み温度センサー
１５ 室内熱交換器温度センサー
１６ 室内熱交換器出口温度センサー
１７ 液側配管
１８ ガス側配管
２０ 制御部 DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Compressor 3 Outdoor heat exchanger 4 Outdoor fan 5 Four-way valve 6 Electronic expansion valve 7 Outdoor air temperature sensor 8 Outdoor heat exchanger temperature sensor 9 Outdoor heat exchanger outlet temperature sensor 10 Indoor unit 11 Indoor fan 12 Indoor heat exchange 13 Operation setting device 14 Indoor suction temperature sensor 15 Indoor heat exchanger temperature sensor 16 Indoor heat exchanger outlet temperature sensor 17 Liquid side piping 18 Gas side piping 20 Control unit

Claims (4)

圧縮機、室内熱交換器、膨張装置、及び室外熱交換器が冷媒配管で接続された空気調和機であって、前記圧縮機の圧縮機周波数を制御する制御部を備え、前記制御部は、外気温度が予め定めた低温範囲に属するか否かを判定する第１判定値と、前記室外熱交換器の熱交換器出口温度と外気温度との差がある範囲に属するか否かを判定する第２判定値、前記圧縮機周波数の下限値とを有し、前記外気温度が第１判定値以下であって、前記熱交換器出口温度と外気温度の差が第２判定値以下の場合、前記圧縮機周波数の前記下限値を補正し、予め設定されている前記圧縮機周波数の下限値を目標下限値にすることを特徴とする空気調和機。 An air conditioner in which a compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger are connected by a refrigerant pipe, and includes a control unit that controls a compressor frequency of the compressor, and the control unit includes: It is determined whether or not the first determination value for determining whether or not the outside air temperature belongs to a predetermined low temperature range and the difference between the outdoor temperature and the heat exchanger outlet temperature of the outdoor heat exchanger. A second determination value, a lower limit value of the compressor frequency, the outside air temperature is equal to or less than the first determination value, and the difference between the heat exchanger outlet temperature and the outside air temperature is equal to or less than the second determination value, An air conditioner that corrects the lower limit value of the compressor frequency and sets a preset lower limit value of the compressor frequency to a target lower limit value. 圧縮機、室内熱交換器、膨張装置、及び室外熱交換器が冷媒配管で接続された空気調和機であって、前記圧縮機の圧縮機周波数を制御する制御部を備え、前記制御部は、外気温度が予め定めた低温範囲に属するか否かを判定する第１判定値と、前記室外熱交換器の熱交換器温度と外気温度との差がある範囲に属するか否かを判定する第２判定値と前記圧縮機周波数の下限値とを有し、前記外気温度が第１判定値以下であって、前記熱交換器温度と外気温度の差が第２判定値以下の場合、前記圧縮機周波数の前記下限値を補正し、予め設定されている前記圧縮機周波数の下限値を目標下限値にすることを特徴とする空気調和機。 An air conditioner in which a compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger are connected by a refrigerant pipe, and includes a control unit that controls a compressor frequency of the compressor, and the control unit includes: A first determination value for determining whether or not the outside air temperature belongs to a predetermined low temperature range and a first determination value for determining whether or not the outside air temperature belongs to a certain range between the heat exchanger temperature of the outdoor heat exchanger and the outside air temperature. 2 and a lower limit value of the compressor frequency, and the outside air temperature is equal to or lower than a first determination value, and the difference between the heat exchanger temperature and the outside air temperature is equal to or lower than a second determination value, the compression An air conditioner that corrects the lower limit value of the machine frequency and sets a preset lower limit value of the compressor frequency to a target lower limit value. 圧縮機、室内熱交換器、膨張装置、及び室外熱交換器が冷媒配管で接続された空気調和機であって、前記圧縮機の圧縮機周波数を制御する制御部を備え、前記制御部は、室内吸込み温度が予め定めた低温範囲に属するか否かを判定する第１判定値と、前記室内熱交換器の熱交換器出口温度と室内吸込み温度との差がある範囲に属するか否かを判定する第２判定値と前記圧縮機周波数の下限値とを有し、前記室内吸込み温度が第１判定値以下であって、前記熱交換器出口温度と室内吸込み温度の差が第２判定値以下の場合、前記圧縮機周波数の前記下限値を補正し、予め設定されている前記圧縮機周波数の下限値を目標下限値にすることを特徴とする空気調和機。 An air conditioner in which a compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger are connected by a refrigerant pipe, and includes a control unit that controls a compressor frequency of the compressor, and the control unit includes: It is determined whether or not the first determination value for determining whether or not the indoor suction temperature belongs to a predetermined low temperature range and the difference between the heat exchanger outlet temperature of the indoor heat exchanger and the indoor suction temperature belongs to a certain range. A second determination value to be determined and a lower limit value of the compressor frequency, wherein the indoor suction temperature is equal to or lower than the first determination value, and a difference between the heat exchanger outlet temperature and the indoor suction temperature is a second determination value. In the following cases, the air conditioner is characterized in that the lower limit value of the compressor frequency is corrected and the preset lower limit value of the compressor frequency is set as a target lower limit value. 圧縮機、室内熱交換器、膨張装置、及び室外熱交換器が冷媒配管で接続された空気調和機であって、前記圧縮機の圧縮機周波数を制御する制御部と、を備え、前記制御部は、室内吸込み温度が予め定めた低温範囲に属するか否かを判定する第１判定値と、前記室内熱交換器の熱交換器温度と室内吸込み温度との差がある範囲に属するか否かを判定する第２判定値と前記圧縮機周波数の下限値とを有し、前記室内吸込み温度が第１判定値以下であって、前記熱交換器温度と室内吸込み温度の差が第２判定値以下の場合、前記圧縮機周波数の前記下限値を補正し、予め設定されている前記圧縮機周波数の下限値を目標下限値にすることを特徴とする空気調和機。 An air conditioner in which a compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger are connected by a refrigerant pipe, and includes a control unit that controls a compressor frequency of the compressor, and the control unit Is whether or not the first determination value for determining whether or not the indoor suction temperature belongs to a predetermined low temperature range, and whether or not the difference exists between the heat exchanger temperature of the indoor heat exchanger and the indoor suction temperature And a lower limit value of the compressor frequency, the indoor suction temperature is equal to or lower than the first determination value, and a difference between the heat exchanger temperature and the indoor suction temperature is a second determination value. In the following cases, the air conditioner is characterized in that the lower limit value of the compressor frequency is corrected and the preset lower limit value of the compressor frequency is set as a target lower limit value.
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JP2021018017A (en) * 2019-07-19 2021-02-15 シャープ株式会社 Air conditioner
JP7412912B2 (en) 2019-07-19 2024-01-15 シャープ株式会社 air conditioner
CN111397169A (en) * 2020-03-27 2020-07-10 广东美的制冷设备有限公司 Air conditioner frequency limiting method, air conditioner and storage medium

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