JP2014088989A - Air conditioner - Google Patents

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JP2014088989A
JP2014088989A JP2012238763A JP2012238763A JP2014088989A JP 2014088989 A JP2014088989 A JP 2014088989A JP 2012238763 A JP2012238763 A JP 2012238763A JP 2012238763 A JP2012238763 A JP 2012238763A JP 2014088989 A JP2014088989 A JP 2014088989A
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heat exchanger
fan
outdoor
temperature
outdoor heat
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Hideji Taki
英司 滝
Kazuhiro Sugaya
和弘 菅谷
Peng Wang
鵬 王
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Fujitsu General Ltd
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Fujitsu General Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner capable of preventing noise and breakage of a shaft of a fan motor, a fixing tool and the like due to vibration of a fan by preventing frost formation on the fan by preventing full-frost formation on an outdoor heat exchanger.SOLUTION: An air conditioner in which a compressor, an indoor heat exchanger, an expansion valve and an outdoor heat exchanger are circularly connected by pipes, and which includes: an indoor fan; and an outdoor fan, further includes: a control portion for controlling the compressor, the indoor fan, the expansion valve and the outdoor fan on the basis of information detected by various sensors, and has a defrosting operation function for removing frost formed on the outdoor heat exchanger, further includes full-frost formation determining means for determining whether the probability of full-frost formation on the outdoor heat exchanger exists or not when a heating operation is continued while keeping the present control, and a rotational frequency of the compressor is controlled to be lowered than a rotational frequency in a normal heating operation from the start of the heating operation after termination of a defrosting operation, when the defrosting operation is started after the probability of the full-frost formation of the outdoor heat exchanger is determined by the full-frost formation determining means during the heating operation.

Description

本発明は、空気調和機に関するものであり、低温多湿の環境で暖房運転を行う場合に、室外熱交換器及び室外ファンに対する着霜を防止する技術に関するものである。   The present invention relates to an air conditioner, and relates to a technique for preventing frost formation on an outdoor heat exchanger and an outdoor fan when heating operation is performed in a low temperature and high humidity environment.

空気調和機において、低温多湿の環境で暖房運転を行う場合、大気が室外熱交換器(蒸発器)を通過する際に冷やされることで運転時の大気の露点温度以下となり、大気中に含まれる水分が霜となって室外熱交換器に付着することがある(大気中の雨、雪が付着する場合もある)。このような現象を、一般的に着霜という(室外熱交換器全体が着霜して熱交換できない状態となることを全着霜という)。暖房運転継続中は室外熱交換器が常に冷やされ続けることになるため、大気温度や湿度に変化が生じない場合には、暖房運転時間が長くなると室外熱交換器に付く着霜量も多くなり、最終的に全く大気が通過することができない全着霜が生じて、熱交換能力が著しく低下してしまう。   In an air conditioner, when heating operation is performed in a low-temperature and high-humidity environment, the air is cooled when it passes through an outdoor heat exchanger (evaporator), so that it falls below the dew point of the air during operation and is included in the air Moisture may become frost and adhere to the outdoor heat exchanger (rain and snow in the atmosphere may adhere). Such a phenomenon is generally referred to as frost formation (the entire outdoor heat exchanger is frosted and heat exchange cannot be performed is referred to as total frost formation). Since the outdoor heat exchanger will continue to be cooled while the heating operation continues, if the air temperature and humidity do not change, the amount of frost on the outdoor heat exchanger increases as the heating operation time increases. Eventually, all the frost that cannot pass through the atmosphere at all will be generated, and the heat exchange capacity will be significantly reduced.

全着霜状態は空気調和機の暖房機能の大きな低下となるため好ましくない。これを機能回復させるためには霜を落として熱交換可能にする必要があり、その方法として、蒸発器として使っていた室外熱交換器を一時的に凝縮器として使用して室外熱交換器の温度を高めて熱で霜を溶かすことが行われる。これを除霜運転という。当然、除霜運転中は暖房機能が失われてしまう。なお、除霜運転の方法はこれに限らず、別途ヒータを用いた除霜手段やホットガスバイパスによる除霜手段などを用いた他の除霜の方法が存在する。   The total frosting state is not preferable because it greatly reduces the heating function of the air conditioner. In order to recover this function, it is necessary to remove the frost and make it possible to exchange heat. As a method, the outdoor heat exchanger used as an evaporator is temporarily used as a condenser, so The temperature is raised and the frost is melted with heat. This is called defrosting operation. Naturally, the heating function is lost during the defrosting operation. In addition, the method of a defrost operation is not restricted to this, There exist the other defrost methods using the defrost means using a heater separately, the defrost means by a hot gas bypass, etc.

図5(a)及び(b)に示すのは、プロペラファンを搭載した室外機を表した模式図である。図5(a)に示す室外機10は、筐体11内部に室外熱交換器12を有しており、プロペラファン(以下、室外ファン)14の回転によって大気取入口13から取入れた大気と室外熱交換器12に流れる冷媒との間で熱交換し、熱交換後の大気を吹出口15から排出する構成となっている。なお、31は、圧縮機であり、17は、ファンモータである。   FIGS. 5A and 5B are schematic views illustrating an outdoor unit equipped with a propeller fan. An outdoor unit 10 shown in FIG. 5A has an outdoor heat exchanger 12 inside a housing 11, and the atmosphere taken in from the atmosphere inlet 13 by the rotation of a propeller fan (hereinafter referred to as an outdoor fan) 14 and the outdoor Heat is exchanged between the refrigerant flowing in the heat exchanger 12 and the air after the heat exchange is discharged from the outlet 15. In addition, 31 is a compressor and 17 is a fan motor.

この図5のような室外機10の場合、室外熱交換器12が全着霜してしまって大気がほとんど通過できなくなると、大気取入口13から大気を吸うことが出来ないため、図5(b)に矢印で示すように、吹出口15の中心部から大気を吸込む量が大きくなる。吹出口15の中心部から吸込む大気は熱交換を行っていないため湿度の高い状態のままである。そして、露点温度以下まで冷却された室外熱交換器12の影響で、この室外ファン14の温度も露点温度以下となっており、この時に吸込んだ大気中の水分が霜となりプロペラファン14に付着してしまう。
そして、この付着した霜が次第に成長すると室外ファン14の重量バランスが崩れて振動するため、騒音の原因になり、また、ファンモータ17の軸や固定具等が破損する恐れがある。
In the case of the outdoor unit 10 as shown in FIG. 5, when the outdoor heat exchanger 12 is completely frosted and the atmosphere hardly passes, the atmosphere cannot be sucked from the atmosphere intake 13. As indicated by arrows in b), the amount of air sucked from the center of the air outlet 15 increases. The atmosphere sucked from the center of the blowout port 15 remains in a high humidity state because no heat exchange is performed. Then, due to the influence of the outdoor heat exchanger 12 cooled to the dew point temperature or lower, the temperature of the outdoor fan 14 is also lower than the dew point temperature, and the moisture in the air sucked at this time becomes frost and adheres to the propeller fan 14. End up.
When the attached frost gradually grows, the weight balance of the outdoor fan 14 is lost and vibrates, causing noise and the shaft of the fan motor 17 and the fixture may be damaged.

着霜時の室外ファンの送風音の増加を防止することを課題としたものとして、例えば、特許文献1が挙げられる。この特許文献1に記載の室外機は、熱交換器への着霜を検知した場合に、室外ファンへの入力を一定に保つように制御することで、通風抵抗が増加した場合には室外ファンの回転数が自然に低下して、送風音の増加を防ぐ構成となっている。
特開2007−292439号公報
For example, Patent Document 1 is cited as an object of preventing an increase in blowing sound of an outdoor fan during frost formation. The outdoor unit described in Patent Document 1 controls an outdoor fan when ventilation resistance increases by controlling the input to the outdoor fan to be constant when frost formation on the heat exchanger is detected. The number of rotations is naturally reduced to prevent an increase in blowing sound.
JP 2007-292439 A

前記特許文献1によれば騒音は防ぐことができるが、室外熱交換器への着霜の進行は防ぐことができないので、図5(b)に示すような、室外熱交換器が霜で塞がる状況はどうしても生じてしまう。よって、この特許文献1においても、室外熱交換器が全着霜してしまった場合には除霜(デフロスト)運転を行うことになる。しかし、除霜運転を行うことで室外熱交換器に付着した霜は取り除くことができるが、室外ファンに付着した霜は取り除くことが難しい。よって、暖房運転と除霜運転を繰り返していると室外ファンに付着した霜が成長して大きくなってしまう。すなわち、特許文献1の制御のみでは、室外ファンへの着霜を防げず、ファンモータの軸や固定具等が破損するおそれを取り除けないという問題がある。   According to Patent Document 1, noise can be prevented, but progress of frost formation on the outdoor heat exchanger cannot be prevented, so that the outdoor heat exchanger as shown in FIG. 5B is blocked with frost. The situation is unavoidable. Therefore, also in this patent document 1, when the outdoor heat exchanger has completely frosted, a defrosting (defrost) operation is performed. However, although frost attached to the outdoor heat exchanger can be removed by performing the defrosting operation, it is difficult to remove frost attached to the outdoor fan. Therefore, if the heating operation and the defrosting operation are repeated, the frost attached to the outdoor fan grows and becomes large. That is, there is a problem that only the control of Patent Document 1 cannot prevent frost formation on the outdoor fan, and the possibility of damaging the fan motor shaft and fixtures cannot be removed.

従来は、この現象に対してはある程度の霜が付き、室外ファンが振動しても問題ない強度のファンモータの軸、ファンモータ固定具にして対応している。しかしながら、室外ファンが大きい機種の場合や、より湿度が高い低温の環境で暖房運転した場合に室外ファンに付着する霜の量が大きく、従来技術では対応できない場合がある。   Conventionally, this phenomenon has been dealt with by using a fan motor shaft and a fan motor fixture that are strong enough to cause a certain amount of frost and have no problem even if the outdoor fan vibrates. However, in the case of a model with a large outdoor fan or when heating operation is performed in a low temperature environment with higher humidity, the amount of frost adhering to the outdoor fan is large, and the conventional technology may not be able to cope with it.

本発明は、上記問題点に鑑みなされたものであり、室外熱交換器12の全着霜を回避して室外ファン14への着霜を防ぐことで、室外ファン14の振動による騒音及びファンモータ17の軸や固定具等の破損を防止することを可能にした空気調和機を提供することを目的とするものである。   The present invention has been made in view of the above-described problems, and avoids frost formation on the outdoor fan 14 by avoiding all frost formation on the outdoor heat exchanger 12, thereby preventing noise and vibration caused by vibration of the outdoor fan 14. An object of the present invention is to provide an air conditioner that can prevent breakage of 17 shafts and fixtures.

本発明の請求項1は、圧縮機、室内熱交換器、膨張弁、室外熱交換器を配管により環状に連結し、室内ファン、室外ファンを備え、各種センサで検出した情報に基づいて前記圧縮機、前記室内ファン、前記膨張弁、前記室外ファンを制御する制御部を具備し、前記室外熱交換器に着霜した霜を落とす除霜運転機能を有する空気調和機において、現在の制御のまま暖房運転を継続すると前記室外熱交換器が全着霜に至る可能性があるか否かを判断する全着霜判断手段を備え、暖房運転中に前記全着霜判断手段が前記室外熱交換器が全着霜に至る可能性があると判断した後に除霜運転を開始した場合には、除霜運転終了後の暖房運転開始時から前記圧縮機の回転数を通常暖房運転時の回転数より下げるように制御することを特徴とする空気調和機である。   According to a first aspect of the present invention, a compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger are connected in a ring shape by piping, and an indoor fan and an outdoor fan are provided, and the compression is performed based on information detected by various sensors. An air conditioner having a defrosting operation function for removing frost formed on the outdoor heat exchanger, and a control unit for controlling the outdoor fan, the indoor fan, the expansion valve, and the outdoor fan. When the heating operation is continued, the outdoor heat exchanger includes a total frost determination unit that determines whether or not there is a possibility that the outdoor heat exchanger may reach a total frost, and the total frost determination unit during the heating operation includes the outdoor frost determination unit. When the defrosting operation is started after determining that there is a possibility of reaching full frosting, the rotation speed of the compressor from the rotation speed during the normal heating operation from the start of the heating operation after the completion of the defrosting operation. An air conditioner controlled to be lowered A.

本発明の請求項2は、請求項1に加えて、前記圧縮機の回転数の制御は、室内機の設置された部屋の温度を検出する室内温度センサによって検出した室内温度が所定値以上低下しない範囲で、圧縮機の回転数を制御するようにすることを特徴とする空気調和機である。   According to a second aspect of the present invention, in addition to the first aspect, in the control of the rotation speed of the compressor, the indoor temperature detected by the indoor temperature sensor for detecting the temperature of the room in which the indoor unit is installed is lowered by a predetermined value or more. The air conditioner is characterized in that the rotational speed of the compressor is controlled within a range not to be used.

本発明の請求項3は、請求項1又は2に加えて、前記全着霜判断手段は、前記室外熱交換器の温度を計測する室外熱交温度センサと、外気温度を計測する外気温度センサとの2つのセンサで計測した温度に基づく温度判定条件、及び/又は、前記室外ファンの回転数を検出する機能に基づく室外ファンの回転数の変化に関するファン回転数条件を満たした場合に全着霜に至る可能性があると判断することを特徴とする空気調和機である。   According to a third aspect of the present invention, in addition to the first or second aspect, the total frost determination means includes an outdoor heat exchange temperature sensor that measures the temperature of the outdoor heat exchanger, and an outdoor temperature sensor that measures the outdoor temperature. If the temperature determination condition based on the temperature measured by the two sensors and / or the fan rotation speed condition regarding the change in the rotation speed of the outdoor fan based on the function of detecting the rotation speed of the outdoor fan is satisfied, It is an air conditioner characterized by determining that there is a possibility of frost formation.

本発明の請求項4は、請求項1乃至3に加えて、前記温度判定条件は、前記外気温度センサによる温度をT、前記室外熱交温度センサによる温度をTとし、温度に関する第一閾値、及び、前記第一閾値よりも低温の第ニ閾値を設定したときに、
(1)T≧第一閾値 かつ T≦第ニ閾値
(2)T<第一閾値 かつ TとTの温度差が所定値以上
の何れかを満たす場合としたことを特徴とする空気調和機である。
According to a fourth aspect of the present invention, in addition to the first to third aspects, the temperature determination condition is that the temperature by the outside air temperature sensor is T 1 , the temperature by the outdoor heat exchange temperature sensor is T 2 , When the threshold value and the second threshold value lower than the first threshold value are set,
(1) T 1 ≧ first threshold and T 2 ≦ second threshold (2) T 1 <first threshold and the temperature difference between T 2 and T 1 satisfies any one of a predetermined value or more. It is an air conditioner.

本発明の請求項5は、請求項1乃至4に加えて、前記ファン回転数条件は、検出した実回転数が目標ファン回転数に対して所定の回転数以上低下した場合としたことを特徴とする空気調和機である。   According to a fifth aspect of the present invention, in addition to the first to fourth aspects, the fan rotational speed condition is that the detected actual rotational speed is lower than a predetermined rotational speed with respect to the target fan rotational speed. It is an air conditioner.

請求項1記載の発明によれば、前記室外熱交換器が全着霜に至る可能性があると判断した後に除霜運転を開始した場合には、除霜運転終了後の暖房運転開始時から前記圧縮機の回転数を通常暖房運転時の回転数より下げるように制御するようにしたので、冷媒の循環量を減らして室外熱交換器が冷却されづらくなることで着霜し難くなり、結果、全着霜を防ぐことが可能となる。   According to the first aspect of the present invention, when the defrosting operation is started after it is determined that the outdoor heat exchanger may reach the total frost formation, the heating operation is started after the defrosting operation is completed. Since the rotation speed of the compressor is controlled to be lower than the rotation speed during normal heating operation, the amount of refrigerant circulation is reduced and the outdoor heat exchanger becomes difficult to be cooled, resulting in difficulty in frost formation. It becomes possible to prevent all frost formation.

請求項2記載の発明によれば、前記圧縮機の回転数の制御は、室内機の設置された部屋の温度を検出する室内温度センサによって検出した室内温度が所定値以上低下しない範囲で、圧縮機の回転数を制御するようにしたので、暖房運転能力が多少低下したとしても冷媒の循環量を減らすことで室外熱交換器の冷却の進行を遅らせて全着霜を防ぐことが可能となる。   According to the second aspect of the present invention, the rotation speed of the compressor is controlled within a range in which the indoor temperature detected by the indoor temperature sensor that detects the temperature of the room in which the indoor unit is installed does not decrease more than a predetermined value. Since the number of revolutions of the machine is controlled, it is possible to prevent the total frost formation by delaying the cooling of the outdoor heat exchanger by reducing the circulation amount of the refrigerant even if the heating operation capacity is somewhat reduced. .

請求項3記載の発明によれば、前記全着霜判断手段は、前記室外熱交換器の温度を計測する室外熱交温度センサと、外気温度を計測する外気温度センサとの2つのセンサで計測した温度に基づく温度判定条件、及び/又は、前記室外ファンの回転数を検出する機能に基づく室外ファンの回転数の変化に関するファン回転数条件を満たした場合に全着霜に至る可能性があると判断するようにしたので、全着霜に至る可能性があることを的確に判断することが可能となる。   According to a third aspect of the present invention, the total frost determination means is measured by two sensors, an outdoor heat exchange temperature sensor that measures the temperature of the outdoor heat exchanger and an outdoor temperature sensor that measures the outdoor temperature. If the temperature determination condition based on the measured temperature and / or the fan rotation speed condition relating to the change in the rotation speed of the outdoor fan based on the function of detecting the rotation speed of the outdoor fan is satisfied, there is a possibility that full frost formation may occur. Therefore, it is possible to accurately determine that there is a possibility of total frost formation.

請求項4記載の発明によれば、本発明特有の温度判定条件により、熱交換器が全着霜に至る可能性があることを正確に判別できる。   According to the fourth aspect of the present invention, it is possible to accurately determine that the heat exchanger may reach total frost formation based on the temperature determination condition unique to the present invention.

請求項5記載の発明によれば、ファン回転数条件は、検出した実回転数が目標ファン回転数に対して所定の回転数以上低下した場合としたので、室外ファンに着霜が生じて回転数が落ち始めたことを検出することが可能となる。   According to the fifth aspect of the present invention, the fan rotational speed condition is that the detected actual rotational speed is lower than the predetermined rotational speed with respect to the target fan rotational speed. It is possible to detect that the number has begun to drop.

本発明による空気調和機における制御方法を表したフローチャート図である。It is a flowchart figure showing the control method in the air conditioner by this invention. 本発明による空気調和機における制御方法を表したフローチャート図である。It is a flowchart figure showing the control method in the air conditioner by this invention. 本発明による空気調和機の構成を表した回路図である。It is a circuit diagram showing the structure of the air conditioner by this invention. 本発明の空気調和機における制御回路の構成の一例を示したブロック図である。It is the block diagram which showed an example of the structure of the control circuit in the air conditioner of this invention. プロペラファンを搭載した室外機の構成の一例を表した模式図である。It is the schematic diagram showing an example of the structure of the outdoor unit carrying a propeller fan.

本発明による空気調和機は、圧縮機、室内熱交換器、膨張弁、室外熱交換器を配管により環状に連結し、室内ファン、室外ファンを備え、各種センサで検出した情報に基づいて前記圧縮機、前記室内ファン、前記膨張弁、前記室外ファンを制御する制御部を具備し、前記室外熱交換器に着霜した霜を落とす除霜運転機能を有する空気調和機において、現在の制御のまま暖房運転を継続すると前記室外熱交換器が全着霜に至る可能性があるか否かを判断する全着霜判断手段を備え、暖房運転中に前記全着霜判断手段が前記室外熱交換器が全着霜に至る可能性があると判断した後に除霜運転を開始した場合には、除霜運転終了後の暖房運転開始時から前記圧縮機の回転数を通常暖房運転時の回転数より下げるように制御することを特徴とするものである。以下、詳細に説明を行う。   An air conditioner according to the present invention includes a compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger connected in a ring shape by piping, and includes an indoor fan and an outdoor fan, and the compression based on information detected by various sensors. An air conditioner having a defrosting operation function for removing frost formed on the outdoor heat exchanger, and a control unit for controlling the outdoor fan, the indoor fan, the expansion valve, and the outdoor fan. When the heating operation is continued, the outdoor heat exchanger includes a total frost determination unit that determines whether or not there is a possibility that the outdoor heat exchanger may reach a total frost, and the total frost determination unit during the heating operation includes the outdoor frost determination unit. When the defrosting operation is started after determining that there is a possibility of reaching full frosting, the rotation speed of the compressor from the rotation speed during the normal heating operation from the start of the heating operation after the completion of the defrosting operation. Characterized by being controlled to lower A. Details will be described below.

本発明の実施の形態を図面に基づいて説明する。図3に示すのは、本発明による空気調和機の構成を表した回路図である。この図3において、空気調和機は室外機10と室内機22で構成され、前記室外機10の圧縮機31、四方弁36から、前記室内機22の室内熱交換器26を通り、前記室外機10の膨張弁27、室外熱交換器12を経て、前記圧縮機31に戻るように配管により環状に連結して暖房運転(点線矢印)を行い、四方弁36の切り替えにより、冷房運転(実線矢印)に切替える。   Embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a circuit diagram showing the configuration of the air conditioner according to the present invention. In FIG. 3, the air conditioner includes an outdoor unit 10 and an indoor unit 22, and passes from the compressor 31 and the four-way valve 36 of the outdoor unit 10 to the indoor heat exchanger 26 of the indoor unit 22, and the outdoor unit. 10 through the expansion valve 27 and the outdoor heat exchanger 12 and connected to the pipe 31 so as to return to the compressor 31 to perform a heating operation (dotted arrow), and by switching the four-way valve 36, a cooling operation (solid arrow) ).

さらに詳しくは、前記圧縮機31の周囲には、前記圧縮機31の筐体に取り付けられた圧縮機温度センサ32と前記圧縮機31の吐出配管に取り付けられた圧縮機吐出側温度センサ33と前記圧縮機31の吸入配管に取り付けられた吸入側温度センサ34を有し、吐出側は、高圧センサ30とオイルセパレータ35と逆止弁18を介して前記四方弁36に連結されている。また、圧縮機31の吸入側とオイルセパレータ35の間に配管で連結されている電磁弁19は、起動時に冷媒が所定温度になるまでオイルセパレータ35と圧縮機31の吸入側をバイパスするために開放される。
前記室内機22の室内熱交換器26には、この室内熱交換器26の室内熱交換器の温度を検出する室内熱交中間温度センサ23が設けられ、また、前記室内熱交換器26に臨ませてこの室内熱交換器26に風を送る室内ファン25と室内機22の設置された部屋の温度を検出する室内温度センサ24が設けられて室内機22を構成している。
前記膨張弁27と室外熱交換器12との間には、ストレーナ38が介在されて連結されている。
前記室外機10の室外熱交換器12には、この室外熱交換器12の温度を検出する室外熱交温度センサ28が設けられ、室外熱交換器12の近傍に外気温度センサ29が設けられている。この室外熱交温度センサ28で検出される室外熱交換器12の温度は、室外熱交換器12の中を通過する冷媒の温度(飽和温度)と等しい。
前記四方弁36と圧縮機31の吸入側の間には、低圧センサ21とサブアキュムレータ20が設けられている。
More specifically, around the compressor 31, a compressor temperature sensor 32 attached to a casing of the compressor 31, a compressor discharge side temperature sensor 33 attached to a discharge pipe of the compressor 31, and the above The suction side temperature sensor 34 is attached to the suction pipe of the compressor 31, and the discharge side is connected to the four-way valve 36 via the high pressure sensor 30, the oil separator 35, and the check valve 18. Further, the solenoid valve 19 connected by a pipe between the suction side of the compressor 31 and the oil separator 35 bypasses the oil separator 35 and the suction side of the compressor 31 until the refrigerant reaches a predetermined temperature at the time of startup. Opened.
The indoor heat exchanger 26 of the indoor unit 22 is provided with an indoor heat exchanger intermediate temperature sensor 23 for detecting the temperature of the indoor heat exchanger of the indoor heat exchanger 26, and the indoor heat exchanger 26 is exposed to the indoor heat exchanger 26. The indoor unit 22 is configured by an indoor fan 25 that sends air to the indoor heat exchanger 26 and an indoor temperature sensor 24 that detects the temperature of the room in which the indoor unit 22 is installed.
A strainer 38 is interposed and connected between the expansion valve 27 and the outdoor heat exchanger 12.
The outdoor heat exchanger 12 of the outdoor unit 10 is provided with an outdoor heat exchanger temperature sensor 28 that detects the temperature of the outdoor heat exchanger 12, and an outdoor air temperature sensor 29 is provided in the vicinity of the outdoor heat exchanger 12. Yes. The temperature of the outdoor heat exchanger 12 detected by the outdoor heat exchanger temperature sensor 28 is equal to the temperature of the refrigerant passing through the outdoor heat exchanger 12 (saturation temperature).
A low-pressure sensor 21 and a sub-accumulator 20 are provided between the four-way valve 36 and the suction side of the compressor 31.

図4は、本発明の空気調和機における制御回路の構成の一例を示したブロック図である。この図4において、各種演算、駆動信号の出力、モードの切り替えなどの制御を行う制御部39と、演算データ、操作信号などを入力するための入力部40と、暖房運転、冷房運転、除霜運転等、各運転モードの詳細な設定などを記憶するRAM41と、操作手順などのプログラム等を記憶するROM42と、前記四方弁36、電磁弁19、膨張弁27、室外ファン14その他の室外機10の駆動部を制御する室外機制御部43と、室内機22を制御する室内機制御部44とで構成されている。
前記制御部39には、室外熱交温度センサ28、及び、外気温度センサ29と、これら以外の圧縮機温度センサ32、吐出側温度センサ33、吸入側温度センサ34、室内熱交中間温度センサ23、室内温度センサ24などの各種センサ37とが接続されている。
前記制御部39、入力部40、RAM41、ROM42、室外機制御部43、室内機制御部44からなる制御回路は、前記室内機22と室外機10のいずれに設けてもよい。
FIG. 4 is a block diagram showing an example of the configuration of the control circuit in the air conditioner of the present invention. In FIG. 4, a control unit 39 that controls various calculations, drive signal output, mode switching, and the like, an input unit 40 for inputting calculation data, operation signals, and the like, heating operation, cooling operation, and defrosting A RAM 41 that stores detailed settings of each operation mode such as operation, a ROM 42 that stores programs such as operation procedures, the four-way valve 36, the electromagnetic valve 19, the expansion valve 27, the outdoor fan 14, and other outdoor units 10 The outdoor unit control unit 43 that controls the drive unit of the indoor unit 22 and the indoor unit control unit 44 that controls the indoor unit 22 are configured.
The controller 39 includes an outdoor heat exchange temperature sensor 28, an outdoor air temperature sensor 29, a compressor temperature sensor 32, a discharge side temperature sensor 33, a suction side temperature sensor 34, and an indoor heat exchange intermediate temperature sensor 23 other than these. Various sensors 37 such as the indoor temperature sensor 24 are connected.
A control circuit including the control unit 39, the input unit 40, the RAM 41, the ROM 42, the outdoor unit control unit 43, and the indoor unit control unit 44 may be provided in any of the indoor unit 22 and the outdoor unit 10.

ここで、本発明による空気調和機は、室外熱交換器12の全着霜を回避して室外ファン14への着霜を防ぐことで、室外ファン14の振動による騒音及びファンモータ17の軸や固定具等の破損を防止するようにしたことを特徴とするものであり、除霜運転終了後の暖房運転開始時から前記圧縮機31の回転数を通常暖房運転時の回転数より下げるように制御することで、暖房運転能力を低下させて室外熱交換器12が急激に冷却されることを防いで、室外熱交換器12の全着霜を防止するようにしたものである。   Here, the air conditioner according to the present invention avoids all frost formation of the outdoor heat exchanger 12 and prevents frost formation on the outdoor fan 14, so that noise due to vibration of the outdoor fan 14 and the shaft of the fan motor 17 It is characterized by preventing breakage of fixtures, etc., so that the rotation speed of the compressor 31 is lowered from the rotation speed during normal heating operation from the start of heating operation after the completion of the defrosting operation. By controlling, the outdoor heat exchanger 12 is prevented from being rapidly cooled by reducing the heating operation capacity, and thus the frost formation of the outdoor heat exchanger 12 is prevented.

通常、空気調和機において最初に暖房運転を開始する場合には、冷えた室内を所定温度まで暖める必要があるため、一定時間連続(例えば、35分間連続)で暖房運転を行うように制御する。この間は、室外機10の室外熱交換器12に対して着霜が進行したとしても、室内温度を上昇させることを優先することになる。よって、基本的には設定した時間経過、若しくは、設定した気温条件を満足した時に除霜運転を行う構成となっているが、最初の暖房運転開始時には、除霜運転の条件を満たしたとしても除霜運転に移行せずに暖房運転を行うようにしている。しかし、この暖房運転開始からの一定時間において全着霜に至る可能性があると判定した場合には、室外ファン14に霜が着きやすい状況であるので本発明特有の制御を行うものとする。全着霜に至る可能性があると判定する際には、1つ目は外気温度センサ29の温度T及び室外熱交温度センサ28の温度Tを用いた温度判定条件、2つ目は室外機のファン回転数で判定する。具体的な条件を次に示す。 Usually, when the heating operation is first started in the air conditioner, since it is necessary to warm the cooled room to a predetermined temperature, control is performed so that the heating operation is performed continuously for a certain time (for example, 35 minutes continuously). During this time, even if frosting proceeds on the outdoor heat exchanger 12 of the outdoor unit 10, priority is given to increasing the indoor temperature. Therefore, it is basically configured to perform the defrosting operation when the set time elapses or the set temperature condition is satisfied, but even if the defrosting operation condition is satisfied at the start of the first heating operation, Heating operation is performed without shifting to defrosting operation. However, when it is determined that there is a possibility that all the frosts will be formed in a certain time from the start of the heating operation, the outdoor fan 14 is likely to be frosted, so that the control specific to the present invention is performed. When determined that there is a possibility to reach all frost has first temperature determination conditions using the temperature T 2 of the temperature T 1 and the outdoor heat exchanger temperature sensor 28 of the outside air temperature sensor 29, and the second Judgment is based on the fan speed of the outdoor unit. Specific conditions are as follows.

図1に示すのは、本発明による空気調和機における初回の暖房運転開始時の制御方法を表したフローチャート図である。この図1において、先ず、暖房運転を開始(S101)したら、そのときの時刻を記憶しておく。また、暖房運転開始時の外気温度T(S102)、及び、室外機熱交換器温度T(S103)を検出する。この検出したTとTについて、以下の温度判定条件を満たすか否かを判別する(S104)。
[温度判定条件]
(1)T≧−10℃ かつ T≦−17℃
(2)T<−10℃ かつ T≦T−7℃
(3)T<−10℃ かつ T≦−20℃
上記(1)〜(3)の何れかの条件を満たすかを判別し、満たす場合には(S105)へ移行し、満たさない場合には(S109)へ移行する。
FIG. 1 is a flowchart showing a control method at the start of the first heating operation in the air conditioner according to the present invention. In FIG. 1, first, when the heating operation is started (S101), the time at that time is stored. Further, the outside air temperature T 1 (S102) at the start of the heating operation and the outdoor unit heat exchanger temperature T 2 (S103) are detected. For T 1 and T 2 this the detected, determines whether the following temperature determination condition is satisfied (S104).
[Temperature judgment condition]
(1) T 1 ≧ −10 ° C. and T 2 ≦ −17 ° C.
(2) T 1 <−10 ° C. and T 2 ≦ T 1 −7 ° C.
(3) T 1 <−10 ° C. and T 2 ≦ −20 ° C.
It is determined whether any of the above conditions (1) to (3) is satisfied, and if satisfied, the process proceeds to (S105), and if not satisfied, the process proceeds to (S109).

ここで、上記(1)〜(3)の温度判定条件において、−10℃は温度に関する第一閾値であり、−17℃は温度に関する第二閾値であり、−20℃は温度に関する第三閾値である。第一閾値、第二閾値及び第三閾値はこの値に限られるものではなく、室外熱交換器12の全着霜に至る可能性があることを的確に判断できるように室外機10の大きさや構造に合わせて適宜変更して設定するものとする。また、上記(2)においてTとTの間に7℃の温度差があることを条件としている。これは第一閾値と第二閾値との温度差が7℃であるのに合わせて設定したが、必ずしもこれに限らず、この温度差についても適宜変更して設定するものとする。さらに、−20℃という極低温の第三閾値を設定しているのは、吹雪による雪が付着することなどによって室外熱交換器12の温度が急激に低下することがあり、このような場合にも全着霜の可能性が高いため、第三閾値として設定している。 Here, in the temperature determination conditions (1) to (3) above, −10 ° C. is a first threshold value related to temperature, −17 ° C. is a second threshold value related to temperature, and −20 ° C. is a third threshold value related to temperature. It is. The first threshold value, the second threshold value, and the third threshold value are not limited to these values, and the size of the outdoor unit 10 is determined so that it is possible to accurately determine that there is a possibility that the outdoor heat exchanger 12 may be totally frosted. It shall be changed and set appropriately according to the structure. Further, in the above (2), there is a condition that there is a temperature difference of 7 ° C. between T 1 and T 2 . This is set in accordance with the temperature difference between the first threshold value and the second threshold value being 7 ° C. However, the temperature difference is not necessarily limited to this, and the temperature difference is also appropriately changed and set. Furthermore, the third threshold value of the extremely low temperature of −20 ° C. is set because the temperature of the outdoor heat exchanger 12 may suddenly decrease due to the attachment of snow from a snowstorm. Since the possibility of all frost formation is high, it is set as the third threshold value.

温度条件を満たした場合には、次に、室外機10の室外ファン14の回転数を検出する(S105)。通常、室外ファン14に対して目標とする回転数を設定して制御を行っているが、目標回転数と実回転数にズレが生じる場合があり、特に、室外ファン14に着霜して負荷が大きくなっているような場合には両者のズレは大きくなる。そこで、以下のようなファン回転数条件を満たすか否かを判別する(S106)。
[ファン回転数条件]
目標ファン回転数がArpm、実回転数がBrpmのとき、 B≧A−25
(全着霜により、室外ファン14に負荷がかかり目標回転数まで回らなくなる。)
すなわち、実回転数がBrpmが目標ファン回転数Arpmよりも25回転以上小さくなっている場合には、室外熱交換器12は全着霜してしまっていて室外ファン14にも着霜して負荷がかかり目標回転数まで回らなくなっている可能性が高いと判断する。
このファン回転数条件を満たす場合には(S107)へ移行し、満たさない場合には(S109)へ移行する。
If the temperature condition is satisfied, next, the rotational speed of the outdoor fan 14 of the outdoor unit 10 is detected (S105). Usually, control is performed by setting a target rotational speed for the outdoor fan 14, but there may be a deviation between the target rotational speed and the actual rotational speed. In particular, the outdoor fan 14 is frosted and loaded. When the value is large, the difference between the two becomes large. Therefore, it is determined whether or not the following fan rotational speed condition is satisfied (S106).
[Fan speed condition]
When the target fan speed is Arpm and the actual speed is Brpm, B ≧ A-25
(Due to total frost formation, the outdoor fan 14 is loaded and cannot rotate to the target rotational speed.)
That is, when the actual rotational speed Brpm is smaller than the target fan rotational speed Arpm by 25 revolutions or more, the outdoor heat exchanger 12 is completely frosted and the outdoor fan 14 is also frosted and loaded. It is determined that there is a high possibility that the target speed is not reached.
If this fan rotational speed condition is satisfied, the routine proceeds to (S107), and if not, the routine proceeds to (S109).

以上の温度判定条件及びファン回転数条件を満たした場合、その満たした時点での暖房運転開始時刻Hからの経過時間Cが所定時間内、例えば、20分以内であるか否かを判別する(S107)。20分以内にこれらの条件を満たした場合には、除霜運転終了後の暖房運転開始時から室外機10の圧縮機31の回転数を抑える制御を行うことをメモリに記憶する(S108)。ここで、メモリは、図4に示すRAM41であってもよいし、図示しないメモリ手段であってもよい。なお、暖房運転開始からの経過時間Cが20分以上経過している場合には、そのまま(S109)へ移行する。   When the above temperature determination condition and fan rotation speed condition are satisfied, it is determined whether or not the elapsed time C from the heating operation start time H at the time when the condition is satisfied is within a predetermined time, for example, within 20 minutes ( S107). When these conditions are satisfied within 20 minutes, it is stored in the memory that control is performed to suppress the rotational speed of the compressor 31 of the outdoor unit 10 from the start of the heating operation after the completion of the defrosting operation (S108). Here, the memory may be the RAM 41 shown in FIG. 4 or a memory means (not shown). If the elapsed time C from the start of the heating operation has passed 20 minutes or more, the process proceeds to (S109).

このように圧縮機31の回転数を抑える制御を行うのは、圧縮機31の回転数を制限して冷媒の循環量を減らすことで、室外熱交換器12の熱交換能力を低下させて冷却を遅らせることで着霜の進行を防ぎ、結果、全着霜を防ぐためである。
このとき、圧縮機31の回転数を抑えるということは、空気調和機の暖房能力を低下させることになるため、目標とする室温まで温度が上がらなかったり、室温が低下し始めたりする可能性がある。しかし、前記温度判定条件及びファン回転数条件を満たした場合には、室外熱交換器12の全着霜を防止することを優先するために、圧縮機31の回転数を制限する制御を行う。
The control for suppressing the rotation speed of the compressor 31 in this way is performed by limiting the rotation speed of the compressor 31 and reducing the circulation amount of the refrigerant, thereby reducing the heat exchange capability of the outdoor heat exchanger 12 and cooling it. This is to prevent the progress of frosting by delaying the frosting, and as a result, prevent all frosting.
At this time, suppressing the number of rotations of the compressor 31 reduces the heating capacity of the air conditioner, so the temperature may not rise to the target room temperature or the room temperature may start to drop. is there. However, when the temperature determination condition and the fan rotation speed condition are satisfied, control is performed to limit the rotation speed of the compressor 31 in order to give priority to preventing all frost formation of the outdoor heat exchanger 12.

圧縮機31の回転数の制御の具体的内容については、例えば、圧縮機31の回転数を通常暖房運転時の回転数より下げるように制御することが考えられる。現在の外気温度、室内温度、目標室内温度等の条件から選択される圧縮機31の回転数は予め設定されており、その設定に基づいて通常暖房運転が行われている。しかし、本発明の圧縮機回転数の制御に移行した場合には、外気温度、室内温度、目標室内温度等の条件が同じ場合に通常暖房運転時に選択される回転数よりも常に低い回転数が選択されるように制御する。このときの回転数の下げ幅は、室内機22の設置された部屋の温度を検出する室内温度センサ24によって室温をモニタリングして、検出した室温が当該制御開始時の温度に対して所定値(例えば3℃)以上低下しない範囲で、圧縮機31の回転数を制限する。また、低回転数付近において更に回転数を下げる運転が難しい場合があるので、当該制御時の適切な回転数の下限を設定する。これらの回転数の下げ幅、回転数の下限などの設定事項は、室温が低下し続けてしまう等の不具合が生じないように、予め試験、シミュレーションを行って、当該制御時の適切な数値に設定する。
回転数を下げる具体例としては、例えば、全着霜(全結氷)に至る可能性があると判断されて除霜運転後に暖房運転を開始する際に、各条件が室外温度−3℃、室内温度20℃、目標室内温度30℃であった場合、通常暖房運転時の制御では圧縮機31の回転数は95rpsに設定されるところを、80rpsに下げて運転することで全着霜を防止する。
As for the specific contents of the control of the rotation speed of the compressor 31, for example, it is conceivable to control the rotation speed of the compressor 31 to be lower than the rotation speed during the normal heating operation. The number of rotations of the compressor 31 selected from conditions such as the current outside air temperature, the room temperature, and the target room temperature is set in advance, and the normal heating operation is performed based on the setting. However, when the control is shifted to the compressor rotation speed control of the present invention, the rotation speed is always lower than the rotation speed selected during the normal heating operation when the conditions such as the outside air temperature, the room temperature, and the target room temperature are the same. Control to be selected. At this time, the amount of decrease in the rotation speed is monitored by a room temperature sensor 24 that detects the temperature of the room in which the indoor unit 22 is installed, and the detected room temperature is a predetermined value (with respect to the temperature at the start of the control). For example, the number of rotations of the compressor 31 is limited within a range that does not decrease by 3 ° C. or more. Further, since it may be difficult to further reduce the rotational speed in the vicinity of the low rotational speed, an appropriate lower limit of the rotational speed at the time of the control is set. The setting items such as the lowering range of the rotation speed and the lower limit of the rotation speed are set to appropriate values at the time of the control by conducting tests and simulations in advance so as not to cause problems such as the room temperature continuously decreasing. Set.
As a specific example of reducing the rotation speed, for example, when it is determined that there is a possibility of reaching total frost formation (total icing) and heating operation is started after defrosting operation, When the temperature is 20 ° C. and the target room temperature is 30 ° C., the control of the normal heating operation is performed by reducing the rotational speed of the compressor 31 to 95 rps and operating at 80 rps to prevent total frost formation. .

前述の通り、初回暖房運転時は一定時間連続、例えば35分間連続で暖房運転を行うように制御するので、35分経過したか否かを(S109)で判定する。35分経過した場合には(S110)へ移行し、35分経過していない場合には(S102)へ移行する。   As described above, since the control is performed so that the heating operation is performed for a certain period of time continuously, for example, 35 minutes continuously during the first heating operation, it is determined whether or not 35 minutes have elapsed (S109). If 35 minutes have elapsed, the process proceeds to (S110), and if 35 minutes have not elapsed, the process proceeds to (S102).

(S110)では、除霜運転が必要か否かを判定する。この図1のフローチャートの制御とは別に、本発明は室外熱交換器12に対して除霜運転を行うべきか否かを判定する判定手段を前記制御部39に有しており、この判定手段において除霜運転が必要であると判定した場合には図2の(S201)へ移行する。暖房運転を終了して、除霜運転を開始することになる。他方、除霜運転が不要であると判断した場合には(S102)へ戻って、暖房運転を再開する。   In (S110), it is determined whether or not a defrosting operation is necessary. In addition to the control of the flowchart of FIG. 1, the present invention has a determination means for determining whether or not the defrosting operation should be performed on the outdoor heat exchanger 12 in the control unit 39, and this determination means When it is determined that the defrosting operation is necessary, the process proceeds to (S201) in FIG. The heating operation is finished and the defrosting operation is started. On the other hand, when it is determined that the defrosting operation is unnecessary, the process returns to (S102) and the heating operation is resumed.

図2の(S201)では、暖房運転を終了して除霜運転を開始する。除霜運転は、図3における四方弁36を切替えて冷房運転時の接続で運転することで室外熱交換器12を温めて霜を溶かす。なお、除霜運転の方法はこれに限らず、別途ヒータを用いた除霜手段やホットガスバイパスによる除霜手段などによって適宜除霜を行う。そして、除霜運転を一定時間行う、或いは、室外熱交温度センサ28で計測した温度が所定値以上となったなどの除霜運転解除の条件を満たした時点で除霜運転を終了する(S202)。ここで、除霜運転終了から次の暖房運転に移行する前に、前記(S108)のステップにおいて、室外機10の圧縮機31の回転数を抑える制御を行うことがメモリに記憶されているか否かを確認(S203)し、記憶されている場合には(S204)へ移行し、記憶されていない場合には図1の(S102)へ移行する。(S204)では、圧縮機31の回転数を抑える制御を行うことがメモリに記憶されていたので、圧縮機31の回転数を通常暖房運転時よりも低い回転数で運転する制御へ移行する。その後、図1の(S102)へ移行する。図1の(S102)へ移行後は、暖房運転が再開され、この時、通常暖房運転時よりも低い回転数で運転する制御へ移行していた場合には、前述の通り、外気温度、室内温度、目標室内温度等の条件が同じ場合に通常暖房運転時に選択される回転数よりも常に低い回転数が選択されるように制御する。   In (S201) of FIG. 2, the heating operation is terminated and the defrosting operation is started. In the defrosting operation, the outdoor heat exchanger 12 is heated to melt the frost by switching the four-way valve 36 in FIG. In addition, the method of a defrost operation is not restricted to this, Defrost is suitably performed by the defrost means using a heater separately, the defrost means by a hot gas bypass, etc. And defrosting operation is complete | finished when conditions for defrosting operation cancellation | release, such as performing defrosting operation for a fixed period of time, or the temperature measured with the outdoor heat exchanger temperature sensor 28 became more than predetermined value, are complete | finished (S202). ). Here, before shifting from the end of the defrosting operation to the next heating operation, in the step (S108), it is stored in the memory that the control for suppressing the rotational speed of the compressor 31 of the outdoor unit 10 is performed. (S203). If stored, the process proceeds to (S204), and if not stored, the process proceeds to (S102) in FIG. In (S204), since control for suppressing the rotational speed of the compressor 31 is stored in the memory, the control proceeds to control for operating the rotational speed of the compressor 31 at a lower rotational speed than during normal heating operation. Thereafter, the process proceeds to (S102) in FIG. After the transition to (S102) in FIG. 1, the heating operation is resumed. At this time, when the control shifts to a control that operates at a lower rotational speed than the normal heating operation, as described above, the outside air temperature, the indoor temperature When the conditions such as the temperature and the target room temperature are the same, control is performed such that a rotational speed that is always lower than the rotational speed selected during the normal heating operation is selected.

以上のように、本発明の空気調和機によれば、室外機10の室外熱交換器12が全着霜に至る可能性があることを温度判定条件及びファン回転数条件によって判別した場合には、除霜運転終了後の暖房運転開始時から前記圧縮機の回転数を通常暖房運転時の回転数より下げるように制御するようにしたので、暖房運転能力が多少低下したとしても圧縮機31の回転数を制限して冷媒の循環量を減らすことで、室外熱交換器12の冷却の進行を遅らせて全着霜を防ぐことが可能となる。   As described above, according to the air conditioner of the present invention, when the outdoor heat exchanger 12 of the outdoor unit 10 is determined to be fully frosted by the temperature determination condition and the fan rotation speed condition, Since the rotation speed of the compressor is controlled to be lower than the rotation speed during the normal heating operation from the start of the heating operation after the end of the defrosting operation, the compressor 31 By limiting the rotation speed and reducing the circulation amount of the refrigerant, it is possible to delay the progress of cooling of the outdoor heat exchanger 12 and prevent total frost formation.

前記実施例においては、最初の暖房運転開始時から所定時間(実施例では20分)以内で全着霜に至るような状況か否かを判断し、この時間内に条件を満たさない場合には圧縮機31の回転数の制御は行わないものとしていたが、本発明は必ずしもこれに限定されるものではない。例えば、最初の暖房運転開始から10分経過後に急激に気温が低下して暖房運転開始から25分経過時点で温度判定条件及びファン回転数条件を満たすようになった場合、室外熱交換器12が全着霜してしまい残りの10分の暖房運転でファンに着霜が生じる可能性は十分にあるが、前記実施例1の場合には圧縮機31の回転数の制御は行わないことになる。しかし、このような場合に対応するために、暖房運転開始からの所定時間のみに着目するのではなく、直近の一定時間内に条件を満たすようになった場合についても、除霜運転終了後の暖房運転開始時から室外機10の圧縮機31の回転数の制御をするようにしてもよい。これに限らず、全着霜が生じ、かつ、ファンにも着霜が生じている状況を判別するための条件は、適宜設定可能である。   In the said Example, it is judged whether it is the situation which reaches all the frost within the predetermined time (20 minutes in an Example) from the time of the first heating operation start, and when conditions are not satisfied within this time Although the control of the rotation speed of the compressor 31 is not performed, the present invention is not necessarily limited to this. For example, when the temperature suddenly drops after 10 minutes from the start of the first heating operation and the temperature determination condition and the fan rotation speed condition are satisfied at 25 minutes after the start of the heating operation, the outdoor heat exchanger 12 is Although there is a possibility that the fan will be frosted and the fan will be frosted in the remaining 10 minutes of heating operation, in the case of the first embodiment, the rotation speed of the compressor 31 is not controlled. . However, in order to cope with such a case, not only focusing on the predetermined time from the start of the heating operation, but also when the condition is met within the latest fixed time, You may make it control the rotation speed of the compressor 31 of the outdoor unit 10 from the time of heating operation start. Not only this but the conditions for discriminating the situation where all the frost is generated and the fan is also frosted can be appropriately set.

10…室外機、11…筐体、12…室外熱交換器、13…大気取入口、14…室外ファン、15…吹出口、17…ファンモータ、18…逆止弁、19…電磁弁、20…サブアキュムレータ、21…低圧センサ、22…室内機、23…室内熱交中間温度センサ、24…室内温度センサ、25…室内ファン、26…室内熱交換器、27…膨張弁、28…室外熱交温度センサ、29…外気温度センサ、30…高圧センサ、31…圧縮機、32…圧縮機温度センサ、33…吐出側温度センサ、34…吸入側温度センサ、35…オイルセパレータ、36…四方弁、37…各種センサ、38…ストレーナ、39…制御部、40…入力部、41…RAM、42…ROM、43…室外機制御部、44…室内機制御部。 DESCRIPTION OF SYMBOLS 10 ... Outdoor unit, 11 ... Housing | casing, 12 ... Outdoor heat exchanger, 13 ... Atmospheric intake, 14 ... Outdoor fan, 15 ... Outlet, 17 ... Fan motor, 18 ... Check valve, 19 ... Solenoid valve, 20 DESCRIPTION OF SYMBOLS ... Sub accumulator, 21 ... Low pressure sensor, 22 ... Indoor unit, 23 ... Indoor heat exchange intermediate temperature sensor, 24 ... Indoor temperature sensor, 25 ... Indoor fan, 26 ... Indoor heat exchanger, 27 ... Expansion valve, 28 ... Outdoor heat AC temperature sensor, 29 ... Outside air temperature sensor, 30 ... High pressure sensor, 31 ... Compressor, 32 ... Compressor temperature sensor, 33 ... Discharge side temperature sensor, 34 ... Suction side temperature sensor, 35 ... Oil separator, 36 ... 4-way valve 37 ... Various sensors, 38 ... Strainer, 39 ... Control part, 40 ... Input part, 41 ... RAM, 42 ... ROM, 43 ... Outdoor unit control part, 44 ... Indoor unit control part.

Claims (5)

圧縮機、室内熱交換器、膨張弁、室外熱交換器を配管により環状に連結し、室内ファン、室外ファンを備え、各種センサで検出した情報に基づいて前記圧縮機、前記室内ファン、前記膨張弁、前記室外ファンを制御する制御部を具備し、前記室外熱交換器に着霜した霜を落とす除霜運転機能を有する空気調和機において、
現在の制御のまま暖房運転を継続すると前記室外熱交換器が全着霜に至る可能性があるか否かを判断する全着霜判断手段を備え、暖房運転中に前記全着霜判断手段が前記室外熱交換器が全着霜に至る可能性があると判断した後に除霜運転を開始した場合には、除霜運転終了後の暖房運転開始時から前記圧縮機の回転数を通常暖房運転時の回転数より下げるように制御することを特徴とする空気調和機。
A compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger are connected in an annular shape by piping, and include an indoor fan and an outdoor fan, and the compressor, the indoor fan, and the expansion based on information detected by various sensors In an air conditioner having a control unit for controlling the valve and the outdoor fan, and having a defrosting operation function for removing frost formed on the outdoor heat exchanger,
When the heating operation is continued with the current control, the outdoor heat exchanger includes a total frost determination unit that determines whether or not there is a possibility of reaching the total frost formation. When the defrosting operation is started after it is determined that the outdoor heat exchanger may reach full frost formation, the rotation speed of the compressor is set to the normal heating operation from the start of the heating operation after the completion of the defrosting operation. An air conditioner that is controlled to be lower than the rotational speed of the hour.
前記圧縮機の回転数の制御は、室内機の設置された部屋の温度を検出する室内温度センサによって検出した室内温度が所定値以上低下しない範囲で、圧縮機の回転数を制御するようにすることを特徴とする請求項1記載の空気調和機。   The control of the rotation speed of the compressor controls the rotation speed of the compressor within a range in which the indoor temperature detected by the indoor temperature sensor that detects the temperature of the room in which the indoor unit is installed does not decrease by a predetermined value or more. The air conditioner according to claim 1. 前記全着霜判断手段は、前記室外熱交換器の温度を計測する室外熱交温度センサと、外気温度を計測する外気温度センサとの2つのセンサで計測した温度に基づく温度判定条件、及び/又は、前記室外ファンの回転数を検出する機能に基づく室外ファンの回転数の変化に関するファン回転数条件を満たした場合に全着霜に至る可能性があると判断することを特徴とする請求項1又は2記載の空気調和機。   The total frost determination means includes a temperature determination condition based on temperatures measured by two sensors, an outdoor heat exchanger temperature sensor that measures the temperature of the outdoor heat exchanger and an outdoor temperature sensor that measures the outdoor air temperature, and / or Alternatively, it is determined that there is a possibility of full frost formation when a fan rotation speed condition relating to a change in the rotation speed of the outdoor fan based on a function of detecting the rotation speed of the outdoor fan is satisfied. The air conditioner according to 1 or 2. 前記温度判定条件は、前記外気温度センサによる温度をT、前記室外熱交温度センサによる温度をTとし、温度に関する第一閾値、及び、前記第一閾値よりも低温の第ニ閾値を設定したときに、
(1)T≧第一閾値 かつ T≦第ニ閾値
(2)T<第一閾値 かつ TとTの温度差が所定値以上
の何れかを満たす場合としたことを特徴とする請求項1乃至3記載の空気調和機。
The temperature determination condition is set such that the temperature by the outdoor temperature sensor is T 1 , the temperature by the outdoor heat exchange temperature sensor is T 2 , and a first threshold value related to temperature and a second threshold value lower than the first threshold value are set. When
(1) T 1 ≧ first threshold and T 2 ≦ second threshold (2) T 1 <first threshold and the temperature difference between T 2 and T 1 satisfies any one of a predetermined value or more. The air conditioner according to any one of claims 1 to 3.
前記ファン回転数条件は、検出した実回転数が目標ファン回転数に対して所定の回転数以上低下した場合としたことを特徴とする請求項1乃至4記載の空気調和機。   5. The air conditioner according to claim 1, wherein the fan rotational speed condition is a case where the detected actual rotational speed is decreased by a predetermined rotational speed or more with respect to the target fan rotational speed.
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