JP2021004686A - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
JP2021004686A
JP2021004686A JP2019118024A JP2019118024A JP2021004686A JP 2021004686 A JP2021004686 A JP 2021004686A JP 2019118024 A JP2019118024 A JP 2019118024A JP 2019118024 A JP2019118024 A JP 2019118024A JP 2021004686 A JP2021004686 A JP 2021004686A
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Prior art keywords
blower fan
outdoor
air conditioner
acceleration
rotation
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JP2019118024A
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JP6670970B1 (en
Inventor
智大 加藤
Tomohiro Kato
智大 加藤
中村　聡
Satoshi Nakamura
中村　　聡
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Hitachi Johnson Controls Air Conditioning Inc
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Hitachi Johnson Controls Air Conditioning Inc
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Priority to JP2019118024A priority Critical patent/JP6670970B1/en
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Publication of JP6670970B1 publication Critical patent/JP6670970B1/en
Priority to CN202010295979.5A priority patent/CN112146158B/en
Priority to EP20173808.5A priority patent/EP3757472B1/en
Publication of JP2021004686A publication Critical patent/JP2021004686A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/46—Component arrangements in separate outdoor units
    • F24F1/48—Component arrangements in separate outdoor units characterised by air airflow, e.g. inlet or outlet airflow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/56—Remote control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/20—Casings or covers
    • F24F2013/205—Mounting a ventilator fan therein

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

To reduce the possibility that an outdoor blower fan is dislodged.SOLUTION: An air conditioner includes: a blower fan for sending air to an outdoor heat exchanger; and a control unit for controlling acceleration of the blower fan when rotating the blower fan in a first direction in which a fixing member for fixing the blower fan to a housing becomes loose or the rotation number of the blower fan per unit time.SELECTED DRAWING: Figure 1

Description

本発明は、空気調和機に関する。 The present invention relates to an air conditioner.

室外機において、室外の送風ファンを通常運転時の回転とは逆の方向に逆回転させる場合がある。特許文献１には、デフロスト運転によって発生した水蒸気の制御装置への侵入を制御するため、室外の送風ファンを所定時間が経過するまで逆回転させる室外機が開示されている。 In the outdoor unit, the outdoor blower fan may be rotated in the opposite direction to the rotation during normal operation. Patent Document 1 discloses an outdoor unit that reversely rotates an outdoor blower fan until a predetermined time elapses in order to control the intrusion of water vapor generated by defrost operation into a control device.

特開２０１３−３６７１６号公報Japanese Unexamined Patent Publication No. 2013-36716

室外の送風ファンを逆回転させると、送風ファンを固定するナットが緩み、送風ファンが外れる可能性があるという問題があった。 When the outdoor blower fan is rotated in the reverse direction, the nut that fixes the blower fan loosens, and there is a problem that the blower fan may come off.

そこで、室外の送風ファンが外れる可能性を軽減させることを目的とする。 Therefore, the purpose is to reduce the possibility that the outdoor blower fan will come off.

本発明の空気調和機は、室外熱交換器に空気を送る送風ファンと、前記送風ファンを筐体に固定する固定部材が緩む第１の方向に前記送風ファンを回転させる場合の加速度又は単位時間あたりの回転数を制御する制御部とを有する空気調和機。 In the air conditioner of the present invention, the acceleration or unit time when the blower fan that sends air to the outdoor heat exchanger and the blower fan that fixes the blower fan to the housing are rotated in the first direction in which the fixing member is loosened. An air conditioner having a control unit that controls the number of revolutions per unit.

本発明によれば、室外の送風ファンが外れる可能性を軽減させることができる。 According to the present invention, the possibility that the outdoor blower fan will come off can be reduced.

実施形態に係る空気調和機を示す外観構成図である。It is external block diagram which shows the air conditioner which concerns on embodiment. 実施形態に係る空気調和機の冷媒回路を示す図である。It is a figure which shows the refrigerant circuit of the air conditioner which concerns on embodiment. 実施形態に係る室外ファンの構成を示す図である。It is a figure which shows the structure of the outdoor fan which concerns on embodiment. 実施形態に係る制御プロファイル等を示す図である。It is a figure which shows the control profile and the like which concerns on embodiment.

以下、本発明の実施形態について図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、実施形態に係る空気調和機１を示す外観構成図である。空気調和機１は、冷凍サイクル（ヒートポンプサイクル）で冷媒を循環させることによって、空調を行う。図１に示すように、空気調和機１は、室内（被空調空間）に設置される室内機１０と、屋外（室外）に設置される室外機２０と、ユーザによって操作されるリモコン３０と、を備えている。 FIG. 1 is an external configuration diagram showing an air conditioner 1 according to an embodiment. The air conditioner 1 performs air conditioning by circulating a refrigerant in a refrigeration cycle (heat pump cycle). As shown in FIG. 1, the air conditioner 1 includes an indoor unit 10 installed indoors (air-conditioned space), an outdoor unit 20 installed outdoors (outdoors), a remote controller 30 operated by a user, and the like. It has.

室内機１０は、リモコン通信部１１を備えている。リモコン通信部１１は、赤外線通信等によって、リモコン３０との間で所定の信号を送受信する。例えば、リモコン通信部１１は、運転／停止指令、設定温度の変更、運転モードの変更、タイマの設定等の信号をリモコン３０から受信する。また、リモコン通信部１１は、室内温度の検出値等をリモコン３０に送信する。他の例として、リモコン３０は、リモコン通信部１１に対して送信のみを行い、リモコン通信部１１は、リモコン３０からの受信のみを行うものとしてもよい。即ち、リモコン３０とリモコン通信部１１の間の通信は一方向のみでもよい。なお、図１では省略しているが、室内機１０と室外機２０とは、冷媒配管を介して接続されると共に、通信線を介して接続されている。 The indoor unit 10 includes a remote control communication unit 11. The remote control communication unit 11 transmits and receives a predetermined signal to and from the remote control 30 by infrared communication or the like. For example, the remote control communication unit 11 receives signals such as an operation / stop command, a change in the set temperature, a change in the operation mode, and a timer setting from the remote controller 30. Further, the remote controller communication unit 11 transmits the detected value of the room temperature and the like to the remote controller 30. As another example, the remote controller 30 may only transmit to the remote controller communication unit 11, and the remote controller communication unit 11 may only receive from the remote controller 30. That is, the communication between the remote controller 30 and the remote controller communication unit 11 may be performed in only one direction. Although omitted in FIG. 1, the indoor unit 10 and the outdoor unit 20 are connected via a refrigerant pipe and also via a communication line.

図２は、実施形態に係る空気調和機１の冷媒回路Ｑを示す図である。なお、図２に示す実線矢印は、暖房運転時における冷媒の流れを示している。また、図２に示す破線矢印は、冷房運転時における冷媒の流れを示している。 FIG. 2 is a diagram showing a refrigerant circuit Q of the air conditioner 1 according to the embodiment. The solid arrow shown in FIG. 2 indicates the flow of the refrigerant during the heating operation. Further, the broken line arrow shown in FIG. 2 indicates the flow of the refrigerant during the cooling operation.

図２に示すように、室内機１０は、リモコン通信部１１のほかに、室内熱交換器１２と、室内ファン１４と、を備えている。室内熱交換器１２において、その伝熱管（図示せず）を通流する冷媒と、室内ファン１４から送り込まれる室内空気と、の間で熱交換が行われる。室内熱交換器１２は、後述の四方弁２５の切り替えにより凝縮器又は蒸発器として動作する。 As shown in FIG. 2, the indoor unit 10 includes an indoor heat exchanger 12 and an indoor fan 14 in addition to the remote control communication unit 11. In the indoor heat exchanger 12, heat exchange is performed between the refrigerant passing through the heat transfer tube (not shown) and the indoor air sent from the indoor fan 14. The indoor heat exchanger 12 operates as a condenser or an evaporator by switching the four-way valve 25 described later.

図２に示すように、室外機２０は、圧縮機２１と、室外熱交換器２２と、室外ファン２３と、室外膨張弁２４（膨張弁）と、四方弁２５と、制御基板２６とを備えている。圧縮機２１は、圧縮機モータ２１ａの駆動によって、低温低圧のガス冷媒を圧縮し、高温高圧のガス冷媒として吐出する機器である。室外熱交換器２２において、その伝熱管（図示せず）を通流する冷媒と、室外ファン２３から送り込まれる外気と、の間で熱交換が行われる。室外熱交換器２２は、四方弁２５の切り替えにより凝縮器又は蒸発器として動作する。室外ファン２３は、送風ファンの一例である。 As shown in FIG. 2, the outdoor unit 20 includes a compressor 21, an outdoor heat exchanger 22, an outdoor fan 23, an outdoor expansion valve 24 (expansion valve), a four-way valve 25, and a control board 26. ing. The compressor 21 is a device that compresses a low-temperature low-pressure gas refrigerant by driving a compressor motor 21a and discharges it as a high-temperature high-pressure gas refrigerant. In the outdoor heat exchanger 22, heat exchange is performed between the refrigerant flowing through the heat transfer tube (not shown) and the outside air sent from the outdoor fan 23. The outdoor heat exchanger 22 operates as a condenser or an evaporator by switching the four-way valve 25. The outdoor fan 23 is an example of a blower fan.

室外ファン２３は、室外熱交換器２２の付近に設置されている。室外ファン２３は、室外ファンモータ２３ａの駆動によって、室外熱交換器２２に外気を送り込む。室外膨張弁２４は、「凝縮器」（室外熱交換器２２及び室内熱交換器１２の一方）で凝縮した冷媒を減圧する機能を有している。なお、室外膨張弁２４において減圧された冷媒は、「蒸発器」（室外熱交換器２２及び室内熱交換器１２の他方）に導かれる。 The outdoor fan 23 is installed near the outdoor heat exchanger 22. The outdoor fan 23 sends outside air to the outdoor heat exchanger 22 by driving the outdoor fan motor 23a. The outdoor expansion valve 24 has a function of reducing the pressure of the refrigerant condensed by the "condenser" (one of the outdoor heat exchanger 22 and the indoor heat exchanger 12). The refrigerant decompressed by the outdoor expansion valve 24 is guided to the "evaporator" (the other of the outdoor heat exchanger 22 and the indoor heat exchanger 12).

四方弁２５は、空気調和機１の運転モードに応じて、冷媒の流路を切り替える弁である。四方弁２５の切り替えにより、冷房運転時には、破線矢印で示すように、圧縮機２１、室外熱交換器２２（凝縮器）、室外膨張弁２４、及び室内熱交換器１２（蒸発器）の順に冷媒が循環する冷凍サイクルとなる。また、四方弁２５の切り替えにより、暖房運転時には、実線矢印で示すように、圧縮機２１、室内熱交換器１２（凝縮器）、室外膨張弁２４、及び室外熱交換器２２（蒸発器）の順に冷媒が循環する冷凍サイクルとなる。即ち、圧縮機２１、「凝縮器」、室外膨張弁２４、及び「蒸発器」を順次に介して、冷凍サイクルで冷媒が循環する冷媒回路Ｑにおいて、前記した「凝縮器」及び「蒸発器」の一方は室外熱交換器２２であり、他方は室内熱交換器１２である。 The four-way valve 25 is a valve that switches the flow path of the refrigerant according to the operation mode of the air conditioner 1. By switching the four-way valve 25, during cooling operation, as shown by the broken arrow, the refrigerant is in the order of the compressor 21, the outdoor heat exchanger 22 (condenser), the outdoor expansion valve 24, and the indoor heat exchanger 12 (evaporator). It becomes a freezing cycle that circulates. Further, by switching the four-way valve 25, during the heating operation, as shown by the solid arrow, the compressor 21, the indoor heat exchanger 12 (condenser), the outdoor expansion valve 24, and the outdoor heat exchanger 22 (evaporator) It becomes a refrigeration cycle in which the refrigerant circulates in order. That is, in the refrigerant circuit Q in which the refrigerant circulates in the refrigeration cycle via the compressor 21, the "condenser", the outdoor expansion valve 24, and the "evaporator" in that order, the above-mentioned "condenser" and "evaporator". One is the outdoor heat exchanger 22 and the other is the indoor heat exchanger 12.

制御基板２６は、不図示の圧縮機制御回路、室外膨張弁制御回路、室外ファン制御回路等を含んでいる。圧縮機制御回路は、圧縮機２１の動作を制御する。室外膨張弁制御回路は、室外膨張弁２４のパルスモータを駆動させるためのパルス信号を送信する。室外ファン制御回路は、室外熱交換器２２に付設された室外ファン２３の室外ファンモータ２３ａの駆動等を制御する。制御基板２６は、制御部の一例である。 The control board 26 includes a compressor control circuit (not shown), an outdoor expansion valve control circuit, an outdoor fan control circuit, and the like. The compressor control circuit controls the operation of the compressor 21. The outdoor expansion valve control circuit transmits a pulse signal for driving the pulse motor of the outdoor expansion valve 24. The outdoor fan control circuit controls the drive of the outdoor fan motor 23a of the outdoor fan 23 attached to the outdoor heat exchanger 22. The control board 26 is an example of a control unit.

図３は、実施形態に係る室外ファン２３の構成を示す図である。図３（Ａ）は、室外ファン２３等の分解斜視図である。図３（Ｂ）は、室外ファン２３等の断面図である。室外ファンモータ２３ａは、ねじ２３ｂでモータ支え２３ｃに取り付けられている。室外ファン２３は、ナット２３ｅで室外ファンモータ２３ａのモータシャフトに取り付けられている。即ち、室外ファン２３は、室外ファンモータ２３ａを介してモータ支え２３ｃに取り付けられ、ナット２３ｅで固定されている。さらに、モータ支え２３ｃは、直接に、又は他の部材を介して筐体２８に取り付けられている。ここで、ナット２３ｅは、固定部材の一例である。なお、室外ファン２３を固定する固定部材は、室外ファン２３を直接又は間接に筐体２８に固定するものであればよく、ナット２３ｅに限定されるものではない。他の例としては、固定部材は、ボルトやねじであってもよい。 FIG. 3 is a diagram showing the configuration of the outdoor fan 23 according to the embodiment. FIG. 3A is an exploded perspective view of the outdoor fan 23 and the like. FIG. 3B is a cross-sectional view of the outdoor fan 23 and the like. The outdoor fan motor 23a is attached to the motor support 23c with screws 23b. The outdoor fan 23 is attached to the motor shaft of the outdoor fan motor 23a with a nut 23e. That is, the outdoor fan 23 is attached to the motor support 23c via the outdoor fan motor 23a and fixed by the nut 23e. Further, the motor support 23c is attached to the housing 28 directly or via other members. Here, the nut 23e is an example of a fixing member. The fixing member for fixing the outdoor fan 23 may be any one that directly or indirectly fixes the outdoor fan 23 to the housing 28, and is not limited to the nut 23e. As another example, the fixing member may be a bolt or a screw.

本実施形態の室外機２０は、空調運転を行い、さらに、空調運転後に塵埃除去運転を行う。ここで、塵埃除去運転とは、空調運転時の室外ファン２３の回転方向と逆の方向に室外ファン２３を回転させることにより、室外ファン２３に付着した塵埃を除去する動作である。以下、空調運転時の室外ファン２３の回転を正回転と称する。また、空調運転時の２３の回転方向とは逆の回転方向への室外ファン２３の回転、即ち塵埃除去運転時の室外ファン２３の回転を逆回転と称する。本実施形態の室外機２０は、ファンの正回転の方向と、ナット２３ｅが締まる方向が一致するよう設計されている。即ち、塵埃除去運転時には、ナット２３ｅが緩む方向に室外ファン２３が回転することになる。これに対し、本実施形態の室外機２０の制御基板２６は、以下の制御を行うことにより、ナット２３ｅが緩むのを防ぐ。 The outdoor unit 20 of the present embodiment performs an air conditioning operation, and further performs a dust removing operation after the air conditioning operation. Here, the dust removing operation is an operation of removing dust adhering to the outdoor fan 23 by rotating the outdoor fan 23 in a direction opposite to the rotation direction of the outdoor fan 23 during the air conditioning operation. Hereinafter, the rotation of the outdoor fan 23 during the air conditioning operation is referred to as forward rotation. Further, the rotation of the outdoor fan 23 in the direction opposite to the rotation direction of the 23 during the air conditioning operation, that is, the rotation of the outdoor fan 23 during the dust removal operation is referred to as reverse rotation. The outdoor unit 20 of the present embodiment is designed so that the direction of forward rotation of the fan and the direction of tightening the nut 23e coincide with each other. That is, during the dust removal operation, the outdoor fan 23 rotates in the direction in which the nut 23e loosens. On the other hand, the control board 26 of the outdoor unit 20 of the present embodiment prevents the nut 23e from loosening by performing the following control.

以下、制御基板２６による室外ファン２３の逆回転に関する制御について説明する。利用者がリモコン３０を操作して、室内機１０の空調運転の停止を指示すると、制御基板２６は、空調運転を停止し、塵埃除去運転を開始する。より具体的には、制御基板２６は、室外ファンモータ２３ａに対して、逆回転の開始を指示する。その後、制御基板２６は、図４に示す加速度の制御プロファイル４０１に従い、逆回転の加速度の制御を行う。図４に示すグラフの横軸は時間、縦軸は回転速度（単位時間あたりの回転数）を示している。図４のグラフには、逆回転の制御プロファイル４０１と共に正回転の制御プロファイル４０２も示している。
なお、空調運転を停止させた後、塵埃除去運転と他の清掃運転の両方を実行する場合、制御基板２６は、塵埃除去運転を他の清掃運転より先に開始させる。他の清掃運転とは、室外機２０内の機器を運転する必要がある運転をいい、例えば、室外熱交換器２２に結露水を発生させて室外熱交換器２２に付着した塵埃を洗い流す運転等をいう。室外機２０内の機器を動かす必要がない清掃運転については、塵埃除去運転と同時に行ってもよく、又は、どちらかを先に行ってもよい。 Hereinafter, control regarding reverse rotation of the outdoor fan 23 by the control board 26 will be described. When the user operates the remote controller 30 to instruct to stop the air conditioning operation of the indoor unit 10, the control board 26 stops the air conditioning operation and starts the dust removing operation. More specifically, the control board 26 instructs the outdoor fan motor 23a to start reverse rotation. After that, the control board 26 controls the acceleration of the reverse rotation according to the acceleration control profile 401 shown in FIG. The horizontal axis of the graph shown in FIG. 4 indicates time, and the vertical axis indicates rotation speed (rotation speed per unit time). The graph of FIG. 4 shows the forward rotation control profile 402 as well as the reverse rotation control profile 401.
When both the dust removing operation and the other cleaning operation are executed after the air conditioning operation is stopped, the control board 26 starts the dust removing operation before the other cleaning operation. The other cleaning operation means an operation in which the equipment inside the outdoor unit 20 needs to be operated. For example, an operation in which dew condensation water is generated in the outdoor heat exchanger 22 to wash away dust adhering to the outdoor heat exchanger 22 and the like. To say. The cleaning operation that does not require the equipment in the outdoor unit 20 to be moved may be performed at the same time as the dust removal operation, or either of them may be performed first.

制御基板２６は、室外ファンモータ２３ａの起動後、一定時間（図４の例では時間ｔ１まで）は、正回転の場合も逆回転の場合も同等の加速度になるよう制御する。 The control board 26 controls the outdoor fan motor 23a so that the acceleration is the same for a certain period of time (up to time t1 in the example of FIG. 4) in both forward rotation and reverse rotation after the start of the outdoor fan motor 23a.

制御基板２６は、時間ｔ１の経過後は、室外ファン２３を逆回転させる場合の加速度が、室外ファン２３を正回転させる場合の加速度より小さくなるよう室外ファンモータ２３ａを制御する。なお、時間ｔ１の経過後の正回転の加速度及び逆回転の加速度は、予め定められている。例えば、正回転の加速度が、２４ｒｐｍ／ｓに設定されている場合には、逆回転の加速度は、２０ｒｐｍ／ｓに設定されているものとする。これにより、逆回転時にナット２３ｅに掛かる力（ナット２３ｅを緩める力）よりも、正回転時にナット２３ｅに掛かる力（ナット２３ｅを締める力）が大きくなる。したがって、逆回転によりナット２３ｅが緩み、室外ファン２３が外れる可能性を軽減させることができる。 After the lapse of time t1, the control board 26 controls the outdoor fan motor 23a so that the acceleration when the outdoor fan 23 is rotated in the reverse direction is smaller than the acceleration when the outdoor fan 23 is rotated in the forward direction. The forward rotation acceleration and the reverse rotation acceleration after the lapse of time t1 are predetermined. For example, when the acceleration of forward rotation is set to 24 rpm / s, it is assumed that the acceleration of reverse rotation is set to 20 rpm / s. As a result, the force applied to the nut 23e (the force to tighten the nut 23e) becomes larger than the force applied to the nut 23e during the reverse rotation (the force to loosen the nut 23e). Therefore, it is possible to reduce the possibility that the nut 23e will loosen due to the reverse rotation and the outdoor fan 23 will come off.

なお、時間ｔ１の経過前において、逆回転の加速度を正回転の加速度と同等としたのは、起動時においても、逆回転の加速度を正回転の加速度よりも小さい値として場合、加速度が低くなり過ぎ、起動に失敗する可能性があるためである。 It should be noted that the reason why the acceleration of the reverse rotation is equal to the acceleration of the forward rotation before the lapse of time t1 is that the acceleration becomes lower even at the time of starting when the acceleration of the reverse rotation is set to a value smaller than the acceleration of the forward rotation. This is because there is a possibility that the startup will fail.

なお、起動後、一定時間（図４の例では時間ｔ１まで）は、正回転の場合も逆回転の場合も加速度を所定の値以上にすればよく、必ずしも正回転の場合と逆回転の場合とで同等の加速度に制御しなければならないわけでない。但し、所定の値は、一定時間後（図４の時間ｔ１からｔ２まで）の逆回転の加速度よりも高い値にすることが望ましい。即ち、室外ファン２３を逆回転させる場合、制御基板２６は、回転開始から時間ｔ１までの加速度が、時間ｔ１から時間ｔ２までの加速度より大きくなるよう制御する。 For a certain period of time (up to time t1 in the example of FIG. 4) after startup, the acceleration may be set to a predetermined value or more in both forward rotation and reverse rotation, and it is not always the case of forward rotation and the case of reverse rotation. It is not necessary to control the acceleration to the same level as. However, it is desirable that the predetermined value is higher than the acceleration of the reverse rotation after a certain period of time (time t1 to t2 in FIG. 4). That is, when the outdoor fan 23 is rotated in the reverse direction, the control board 26 controls so that the acceleration from the start of rotation to the time t1 is larger than the acceleration from the time t1 to the time t2.

制御基板２６はさらに、加速を停止した後（図４の時間ｔ２以降）は、室外ファン２３の逆回転の単位時間あたりの最高回転数が、室外ファン２３の正回転の単位時間あたりの最高回転数より低くなるよう室外ファンモータ２３ａを制御する。より具体的には、正回転の単位時間あたりの最高回転数が予め定められており、逆回転の単位時間あたりの最高回転数として、正回転の単位時間あたりの最高回転数よりも低い値が予め設定されている。そして、制御基板２６は、逆回転中には、逆回転の単位時間あたりの最高回転数を超えないように室外ファンモータ２３ａを制御する。これにより、逆回転に起因して、ナット２３ｅが緩むのを防ぐことができる。 After the acceleration of the control board 26 is further stopped (after the time t2 in FIG. 4), the maximum rotation speed per unit time of the reverse rotation of the outdoor fan 23 is the maximum rotation speed per unit time of the forward rotation of the outdoor fan 23. The outdoor fan motor 23a is controlled so as to be lower than the number. More specifically, the maximum number of revolutions per unit time of forward rotation is predetermined, and the maximum number of revolutions per unit time of reverse rotation is lower than the maximum number of revolutions per unit time of forward rotation. It is preset. Then, the control board 26 controls the outdoor fan motor 23a so as not to exceed the maximum rotation speed per unit time of the reverse rotation during the reverse rotation. As a result, it is possible to prevent the nut 23e from loosening due to the reverse rotation.

さらに、塵埃除去処理において室外ファン２３が逆回転を行う逆回転時間は、予め設定されているものとする。ここで、逆回転時間は、サーモオンの最低運転時間より短い期間である。ここで、空調運転中は、サーモオンとサーモオフの期間が存在する。サーモオフは、例えば室温が目標値に達しており、圧縮機２１や室外ファン２３を停止させている期間をいう。一方、サーモオンは、圧縮機２１や室外ファン２３を駆動させている期間をいう。サーモオンの最低運転時間は、予め定められている。制御基板２６は、逆回転を行う場合には、この逆回転時間が経過すると逆回転を停止させる。これにより、逆回転の時間が正回転の時間を上回ることにより、ナット２３ｅが緩むのを防ぐことができる。 Further, it is assumed that the reverse rotation time for the outdoor fan 23 to rotate in the reverse direction in the dust removal process is set in advance. Here, the reverse rotation time is a period shorter than the minimum operating time of the thermoon. Here, during the air conditioning operation, there is a period of thermo-on and thermo-off. Thermo-off refers to a period during which, for example, the room temperature has reached the target value and the compressor 21 and the outdoor fan 23 are stopped. On the other hand, the thermo-on refers to a period during which the compressor 21 and the outdoor fan 23 are driven. The minimum operating time of the thermo-on is predetermined. When the control board 26 rotates in the reverse direction, the control board 26 stops the reverse rotation when the reverse rotation time elapses. As a result, it is possible to prevent the nut 23e from loosening due to the reverse rotation time exceeding the forward rotation time.

制御基板２６は、上記加速度で室外ファン２３を一定時間、逆回転させると、塵埃除去運転を終了する。このとき、制御基板２６は、室外ファン２３の逆回転が停止するまでの減速度が、室外ファン２３を逆回転させる場合の加速度より大きくなるよう室外ファンモータ２３ａを制御する。より具体的には、制御基板２６は、塵埃除去運転の終了時に、室外ファンモータ２３ａへの電力供給を停止する。即ち、制御基板２６は、室外ファン２３の逆回転を停止する場合に徐々に速度を落とすような減速制御を行わない。これにより、室外ファン２３は急減速することになる。このように、制御基板２６は、逆回転の減速時には、減速度が逆回転の加速度よりも大きくなるよう制御する。したがって、逆回転の減速時においても、逆回転によりナット２３ｅが緩むのを防ぐことができる。 When the outdoor fan 23 is rotated in the reverse direction for a certain period of time at the above acceleration, the control board 26 ends the dust removing operation. At this time, the control board 26 controls the outdoor fan motor 23a so that the deceleration until the reverse rotation of the outdoor fan 23 is stopped is larger than the acceleration when the outdoor fan 23 is rotated in the reverse direction. More specifically, the control board 26 stops the power supply to the outdoor fan motor 23a at the end of the dust removal operation. That is, the control board 26 does not perform deceleration control that gradually reduces the speed when the reverse rotation of the outdoor fan 23 is stopped. As a result, the outdoor fan 23 suddenly decelerates. In this way, the control board 26 controls so that the deceleration becomes larger than the acceleration of the reverse rotation at the time of deceleration of the reverse rotation. Therefore, it is possible to prevent the nut 23e from loosening due to the reverse rotation even when the reverse rotation is decelerated.

以上、本実施形態の空気調和機１は、室外ファン２３の逆回転時の加速度を制御することで、室外ファン２３が外れる可能性を軽減させることができる。 As described above, the air conditioner 1 of the present embodiment can reduce the possibility that the outdoor fan 23 will come off by controlling the acceleration of the outdoor fan 23 at the time of reverse rotation.

但し、逆回転が行われるタイミングは、空調運転の終了時に限定されるものではない。例えば、ユーザ操作に応じて、任意のタイミングで実行されてもよい。また、本実施形態においては、室外ファン２３の逆回転時の制御について、塵埃除去運転を例に説明したが、室外ファン２３の逆回転が行われるケースは、塵埃除去運転時に限定されるものではない。 However, the timing at which the reverse rotation is performed is not limited to the end of the air conditioning operation. For example, it may be executed at any timing according to the user operation. Further, in the present embodiment, the control during the reverse rotation of the outdoor fan 23 has been described by taking the dust removal operation as an example, but the case where the outdoor fan 23 is rotated in the reverse direction is not limited to the dust removal operation. Absent.

以上、本発明の実施形態の一例について詳述したが、本発明は係る特定の実施形態に限定されるものではない。 Although an example of the embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment.

１ 空気調和機
２３ 室外ファン
２３ｅ ナット
２６ 制御基板 1 Air conditioner 23 Outdoor fan 23e Nut 26 Control board

Claims (7)

室外熱交換器に空気を送る送風ファンと、
前記送風ファンを筐体に固定する固定部材が緩む第１の方向に前記送風ファンを回転させる場合の加速度又は単位時間あたりの回転数を制御する制御部と、
を有する空気調和機。 A blower fan that sends air to the outdoor heat exchanger,
A control unit that controls the acceleration or the number of rotations per unit time when the blower fan is rotated in the first direction in which the fixing member that fixes the blower fan to the housing is loosened.
Air conditioner with. 前記制御部は、前記送風ファンを前記第１の方向に回転させる場合の加速度又は単位時間あたりの回転数が、前記第１の方向と逆の第２の方向に回転させる場合の加速度又は単位時間あたりの回転数より小さくなるよう制御する請求項１に記載の空気調和機。 In the control unit, the acceleration or unit time when the blower fan is rotated in the first direction or the rotation speed per unit time is rotated in the second direction opposite to the first direction. The air conditioner according to claim 1, wherein the air conditioner is controlled to be smaller than the number of revolutions per rotation. 前記制御部は、前記第１の方向の回転を行う場合の加速度を前記送風ファンの前記第１の方向の回転を停止するまでの減速度より小さくなるよう制御する請求項１又は２に記載の空気調和機。 The first or second aspect of the present invention, wherein the control unit controls the acceleration when rotating in the first direction to be smaller than the deceleration until the rotation of the blower fan is stopped in the first direction. Air conditioner. 前記制御部は、前記送風ファンの前記第１の方向の回転の単位時間あたりの最高回転数が、前記送風ファンの前記第１の方向と逆の第２の方向の回転の単位時間あたりの最高回転数より低くなるよう制御する請求項１乃至３の何れか１項に記載の空気調和機。 In the control unit, the maximum number of rotations per unit time of the rotation of the blower fan in the first direction is the maximum per unit time of rotation of the blower fan in the second direction opposite to the first direction. The air conditioner according to any one of claims 1 to 3, which is controlled to be lower than the rotation speed. 前記制御部は、前記送風ファンを前記第１の方向に回転させた後に、サーモオンの最低運転時間が経過する前に前記送風ファンを停止させる請求項１乃至４の何れか１項に記載の空気調和機。 The air according to any one of claims 1 to 4, wherein the control unit stops the blower fan after rotating the blower fan in the first direction and before the minimum operating time of the thermoon elapses. Harmony machine. 前記制御部は、空調運転中は前記送風ファンを、前記第１の方向と逆の第２の方向に回転するよう制御し、前記空調運転が終了した後で、前記送風ファンを前記第１の方向に回転するよう制御する請求項１乃至５の何れか１項に記載の空気調和機。 The control unit controls the blower fan to rotate in a second direction opposite to the first direction during the air conditioning operation, and after the air conditioning operation is completed, the blower fan is turned into the first direction. The air conditioner according to any one of claims 1 to 5, which is controlled to rotate in a direction. 前記制御部は、前記送風ファンを前記第１の方向に回転させる場合の回転開始から第１の時間が経過するまでの加速度が、前記第１の時間が経過した後の加速度より大きくなるよう制御する請求項１乃至６の何れか１項に記載の空気調和機。 The control unit controls so that the acceleration from the start of rotation to the elapse of the first time when the blower fan is rotated in the first direction is larger than the acceleration after the elapse of the first time. The air conditioner according to any one of claims 1 to 6.
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