JP2020051649A - Air conditioner - Google Patents

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JP2020051649A
JP2020051649A JP2018179149A JP2018179149A JP2020051649A JP 2020051649 A JP2020051649 A JP 2020051649A JP 2018179149 A JP2018179149 A JP 2018179149A JP 2018179149 A JP2018179149 A JP 2018179149A JP 2020051649 A JP2020051649 A JP 2020051649A
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compressor
rotation speed
speed
condensing pressure
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JP7030037B2 (en
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円 上野
Madoka Ueno
円 上野
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Sharp Corp
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Abstract

To provide an air conditioner capable of maintaining operation efficiency of a compressor at a high level while reducing fluctuation of rotational frequency of the compressor.SOLUTION: An air conditioner performs normal control for attaining target rotational frequency n2 set in accordance with a temperature difference between a room temperature and a set temperature and rotational frequency restriction control for controlling compressor rotational frequency so as to prevent condensation pressure from exceeding an allowable line. In the rotational frequency restriction control, a present current value I in the compressor is detected (S2), and a first reference current Is is calculated based on present rotational frequency n1 of the compressor (S33). When the current value I becomes the first reference current Is or greater (Yes in S34), the compressor rotational frequency is lowered (S5). When the current value I is smaller than the first reference current Is (No in S34), a second reference current Is2 is calculated based on the target rotational frequency n2 of the compressor (S36). When the current value I becomes smaller than the second reference current Is2 (No in S37), the compressor rotational frequency is increased to the target rotational frequency n2 (S8).SELECTED DRAWING: Figure 8

Description

本発明は、圧縮機を含む冷凍サイクルを用いた空気調和機に関する。   The present invention relates to an air conditioner using a refrigeration cycle including a compressor.

冷凍サイクルを用いる空気調和機では、凝縮圧力（圧縮機の吐出圧力）が高くなるほど圧縮機への負荷が大きくなる。このため、凝縮圧力が高くなりすぎないようにするために、圧縮機の回転数制御が行われる。例えば、特許文献１には、圧縮機の吐出圧力を圧力センサにて検知し、圧力センサからの検知圧力が基準値を超えている場合に圧縮機回転数を所定回転数だけ低下させることが開示されている。また、圧力センサは、センサ類の中でも規模が大きくコストも高くなることから、圧力センサに代えてサーミスタを用い、サーミスタによる検知温度から間接的に凝縮圧力を求める方法も一般に知られている。   In an air conditioner using a refrigeration cycle, the load on the compressor increases as the condensation pressure (discharge pressure of the compressor) increases. For this reason, the rotation speed of the compressor is controlled in order to prevent the condensing pressure from becoming too high. For example, Patent Literature 1 discloses that the discharge pressure of a compressor is detected by a pressure sensor, and when the detected pressure from the pressure sensor exceeds a reference value, the compressor rotation speed is reduced by a predetermined rotation speed. Have been. In addition, since the pressure sensor has a large scale and a high cost among sensors, a method of using a thermistor instead of the pressure sensor and indirectly obtaining a condensing pressure from a temperature detected by the thermistor is generally known.

サーミスタを用いて間接的に求められる凝縮圧力は、実際の凝縮圧力に対して時間遅れを生じるものとなる。このため、サーミスタを用いて求められる凝縮圧力によって圧縮機回転数を制御する場合、実際の凝縮圧力によって圧縮機回転数を制御する場合に比べて、反応が遅れることになる。その結果、空気調和機の風量が突然変更された場合や、圧縮機回転数が変動した場合などに、一時的に凝縮圧力が設計圧力（許容圧力）以上となり、圧縮機や空気調和機の部品に損傷が生じてしまう虞がある。   The condensing pressure obtained indirectly using the thermistor causes a time delay with respect to the actual condensing pressure. Therefore, when the compressor speed is controlled by the condensing pressure obtained by using the thermistor, the reaction is delayed as compared with the case where the compressor speed is controlled by the actual condensing pressure. As a result, when the air volume of the air conditioner is suddenly changed or the compressor speed fluctuates, the condensing pressure temporarily exceeds the design pressure (allowable pressure), and the components of the compressor and air conditioner May be damaged.

また、圧縮機の立ち上がり時などは、サイクルが安定しておらず、冷媒の状態が二相域とならずに過熱域や過冷却域となる場合がある。その場合、サーミスタの検知温度が大きく変化して、凝縮圧力を予測すること自体が困難となり、適切な圧縮機の回転数制御が行えないこともある
これに対し、特許文献２には、サーミスタを用いずに、圧縮機における現在の回転数と入力電流とに基づいて凝縮圧力を予測し、予測された凝縮圧力が上限ラインを超えた場合に圧縮機回転数を下げるように制御することが開示されている。このように予測される凝縮圧力は、実際の凝縮圧力に対して時間遅れを生じるものではなく、特許文献２における制御は、反応遅れを生じないものとされている。 Further, when the compressor is started, the cycle is not stable, and the state of the refrigerant may not be in the two-phase region but in the overheated region or the supercooled region. In that case, the detection temperature of the thermistor changes greatly, and it becomes difficult to predict the condensation pressure itself, and it may not be possible to appropriately control the rotational speed of the compressor. Without using, it is disclosed that the condensing pressure is predicted based on the current rotational speed and the input current in the compressor, and control is performed so as to reduce the compressor rotational speed when the predicted condensing pressure exceeds the upper limit line. Have been. The condensing pressure predicted in this manner does not cause a time delay with respect to the actual condensing pressure, and the control in Patent Document 2 does not cause a reaction delay.

特開平８−５８３５７号公報JP-A-8-58357 特開平５−２８８４１２号公報JP-A-5-288412

特許文献２に開示された圧縮機の回転数制御においては、予測された凝縮圧力が上限ラインを超えて圧縮機回転数が下げられた後、予測された凝縮圧力が下限ラインを下回ると通常の回転数制御に戻される。   In the rotation speed control of the compressor disclosed in Patent Document 2, after the predicted condensing pressure exceeds the upper limit line and the compressor rotation speed is reduced, the normal condensing pressure becomes lower than the lower limit line. The control is returned to the rotation speed control.

ここで、設定される凝縮圧力の上限ラインと下限ラインとの間のマージンが小さい場合、予測された凝縮圧力が上限ラインを超えて圧縮機回転数が下げられた後、その後すぐに凝縮圧力が上限ラインを超えてしまい、再び圧縮機回転数を下げるといった変動が繰り返されやすい。このため、圧縮機の回転数変動による騒音や温度変化などにより、ユーザーに不快感を与えるといった問題がある。一方で、凝縮圧力の上限ラインと下限ラインとの間のマージンが大きい場合、圧縮機回転数が下げられた状態で長く運転されることになり、圧縮機の運転効率（運転状態にある圧縮機の能力：運転状態にある圧縮機の回転数／最大圧縮機回転数）が低くなるといった問題がある。   Here, when the margin between the upper limit line and the lower limit line of the set condensing pressure is small, the condensing pressure is increased immediately after the predicted condensing pressure exceeds the upper limit line and the compressor rotation speed is reduced. Fluctuations such as exceeding the upper limit line and lowering the compressor speed again are likely to be repeated. For this reason, there is a problem that the user feels uncomfortable due to noise, temperature change, and the like due to fluctuations in the rotation speed of the compressor. On the other hand, when the margin between the upper limit line and the lower limit line of the condensing pressure is large, the compressor is operated for a long time with the rotational speed of the compressor lowered, and the operating efficiency of the compressor (the compressor in the operating state) Capacity: the rotational speed of the compressor in operation / maximum compressor rotational speed) is low.

本発明は、上記課題に鑑みてなされたものであり、圧縮機の回転数変動を低減しながらも圧縮機の運転効率を高いレベルで維持することのできる空気調和機を提供することを目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide an air conditioner that can maintain the operating efficiency of a compressor at a high level while reducing the rotational speed fluctuation of the compressor. I do.

上記の課題を解決するために、本発明の第１の態様である空気調和機は、圧縮機を含む冷凍サイクルを用いた空気調和機であって、前記圧縮機における現在の電流値を検知する電流検知部と、基準凝縮圧力に相当する基準電流を、圧縮機回転数に基づいて算出する基準電流算出部と、前記圧縮機回転数を制御する回転数制御部とを備えており、前記回転数制御部は、前記圧縮機回転数が、室温と設定温度との温度差に応じて設定される目標回転数となるように制御する通常制御と、凝縮圧力が許容ラインを超えないように、前記圧縮機回転数を制御する回転数規制制御とを行うものであり、前記基準電流算出部は、第１基準凝縮圧力に相当する第１基準電流を、前記圧縮機の現在の回転数に基づいて算出すると共に、前記第１基準凝縮圧力よりも小さい第２基準凝縮圧力に相当する第２基準電流を、前記圧縮機の前記目標回転数に基づいて算出するものであり、前記回転数制御部は、前記回転数規制制御として、前記電流検知部で検知される電流値が前記第１基準電流以上となったときに前記圧縮機回転数を下げる制御を行い、前記電流検知部で検知される電流値が前記第２基準電流未満となったときに前記圧縮機回転数を前記目標回転数にまで上げる制御を行うことを特徴としている。   In order to solve the above problems, an air conditioner according to a first aspect of the present invention is an air conditioner using a refrigeration cycle including a compressor, and detects a current value of the compressor. A current detection unit, a reference current calculation unit that calculates a reference current corresponding to a reference condensing pressure based on a compressor rotation speed, and a rotation speed control unit that controls the compressor rotation speed. The number control unit is a normal control that controls the compressor rotation speed to be a target rotation speed set according to a temperature difference between a room temperature and a set temperature, so that the condensing pressure does not exceed an allowable line, The reference current calculation unit calculates a first reference current corresponding to a first reference condensing pressure based on a current rotation speed of the compressor. And the first reference condensation pressure. And calculating a second reference current corresponding to a second reference condensing pressure that is smaller than the second reference condensation pressure based on the target rotation speed of the compressor. The rotation speed control unit performs the current detection as the rotation speed regulation control. When the current value detected by the section becomes equal to or more than the first reference current, control is performed to reduce the compressor rotation speed, and the current value detected by the current detection section becomes less than the second reference current. It is characterized in that a control is sometimes performed to increase the compressor speed to the target speed.

上記の構成によれば、回転数規制制御として圧縮機回転数を下げる制御は、実際の凝縮圧力に対して時間遅れを生じることがなく、このため、凝縮圧力が圧縮機の仕様として規定されている最大圧力を超えることを確実に防止できる。   According to the above configuration, the control for reducing the compressor rotation speed as the rotation speed regulation control does not cause a time delay with respect to the actual condensing pressure, and therefore, the condensing pressure is defined as a specification of the compressor. Can be reliably prevented from exceeding the maximum pressure.

また、回転数規制制御として圧縮機回転数を目標回転数にまで上げる制御では、目標回転数に対応する第２予測凝縮圧力が使用されるため、圧縮機回転数が速やかに第２基準凝縮圧力近くまで回復する。その結果、圧縮機回転数を第１基準凝縮圧力と第２基準凝縮圧力との間で精度よく変動させることができ、圧縮機回転数が下がり過ぎることも防止できるため、圧縮機の運転効率を高いレベルで維持することができる。   In the control for increasing the compressor speed to the target speed as the speed control, the second predicted condensing pressure corresponding to the target speed is used. Recover to near. As a result, the compressor speed can be accurately varied between the first reference condensing pressure and the second reference condensing pressure, and the compressor speed can be prevented from being excessively reduced. Can be maintained at a high level.

また、上記空気調和機は、前記回転数規制制御において、前記電流検知部で検知される電流値が前記第２基準電流未満となり、前記圧縮機回転数を前記目標回転数にまで上げる場合の前記圧縮機回転数の上昇速度は、前記通常制御で前記圧縮機回転数を上昇させる場合の上昇速度よりも遅くされる構成とすることができる。   The air conditioner may be configured such that, in the rotation speed regulation control, the current value detected by the current detection unit is less than the second reference current, and the compressor rotation speed is increased to the target rotation speed. The rising speed of the compressor rotation speed may be configured to be slower than the rising speed when the compressor rotation speed is increased by the normal control.

上記の構成によれば、回転数規制制御において圧縮機回転数を目標回転数にまで上げる場合に、圧縮機回転数の上昇速度を遅くすることにより、急激なサイクル状態の変化をより確実に抑え、圧縮機の回転数変動をより小さくすることができる。   According to the above configuration, in the case where the compressor rotation speed is increased to the target rotation speed in the rotation speed regulation control, a rapid change in the cycle state is more reliably suppressed by reducing the rising speed of the compressor rotation speed. In addition, fluctuations in the rotational speed of the compressor can be reduced.

また、上記空気調和機では、前記基準電流算出部は、凝縮器雰囲気温度によって補正される前記第１基準電流および前記第２基準電流を求める構成とすることができる。   Further, in the air conditioner, the reference current calculation unit may be configured to obtain the first reference current and the second reference current that are corrected based on a condenser ambient temperature.

上記の構成によれば、第１基準電流および第２基準電流を凝縮器雰囲気温度で補正されたものとして求めることで、基準電流の精度を高めることができ、空気調和機の運転効率をより向上させることができる。   According to the above configuration, by obtaining the first reference current and the second reference current as corrected at the condenser ambient temperature, the accuracy of the reference current can be improved, and the operating efficiency of the air conditioner can be further improved. Can be done.

また、上記の課題を解決するために、本発明の第２の態様である空気調和機は、圧縮機を含む冷凍サイクルを用いた空気調和機であって、前記圧縮機における現在の電流値を検知する電流検知部と、前記電流検知部で検知される電流値と圧縮機回転数とに基づく予測凝縮圧力を求める凝縮圧力算出部と、前記圧縮機回転数を制御する回転数制御部とを備えており、前記回転数制御部は、前記圧縮機回転数が、室温と設定温度との温度差に応じて設定される目標回転数となるように制御する通常制御と、凝縮圧力が許容ラインを超えないように、前記圧縮機回転数を制御する回転数規制制御とを行うものであり、前記凝縮圧力算出部は、前記電流検知部で検知される電流値と前記圧縮機の現在の回転数とに基づく第１予測凝縮圧力と、前記電流検知部で検知される電流値と前記圧縮機の前記目標回転数とに基づく第２予測凝縮圧力とを求めるものであり、前記回転数制御部は、前記回転数規制制御として、前記第１予測凝縮圧力が第１基準凝縮圧力以上となったときに前記圧縮機回転数を下げる制御を行い、前記第２予測凝縮圧力が前記第１基準凝縮圧力よりも小さい第２基準凝縮圧力未満となったときに前記圧縮機回転数を前記目標回転数にまで上げる制御を行うことを特徴としている。   Further, in order to solve the above-described problem, an air conditioner according to a second aspect of the present invention is an air conditioner using a refrigeration cycle including a compressor, wherein a current value of the compressor is reduced. A current detecting unit for detecting, a condensing pressure calculating unit for obtaining a predicted condensing pressure based on a current value and a compressor rotational speed detected by the current detecting unit, and a rotational speed control unit for controlling the compressor rotational speed. Normal control for controlling the compressor speed to be a target speed set according to a temperature difference between room temperature and a set temperature, and a condensing pressure allowable line. The condensing pressure calculation unit controls the current value detected by the current detection unit and the current rotation speed of the compressor so as not to exceed the compressor speed. A first predicted condensation pressure based on the number and the current A second predicted condensing pressure based on the current value detected by the sensing unit and the target rotational speed of the compressor, wherein the rotational speed control unit performs the first prediction as the rotational speed regulation control. When the condensing pressure becomes equal to or higher than the first reference condensing pressure, control is performed to decrease the compressor rotation speed, and the second predicted condensing pressure becomes less than a second reference condensing pressure that is smaller than the first reference condensing pressure. It is characterized in that a control is sometimes performed to increase the compressor speed to the target speed.

上記の構成によれば、第１予測凝縮圧力は実際の凝縮圧力に対して時間遅れを生じるものではなく、回転数規制制御として圧縮機回転数を下げる制御は、実際の凝縮圧力に対して時間遅れを生じることがない。このため、凝縮圧力が圧縮機の仕様として規定されている最大圧力を超えることを確実に防止できる。   According to the above configuration, the first predicted condensing pressure does not cause a time lag with respect to the actual condensing pressure. There is no delay. For this reason, it is possible to reliably prevent the condensing pressure from exceeding the maximum pressure specified as the specification of the compressor.

また、回転数規制制御として圧縮機回転数を目標回転数にまで上げる制御では、目標回転数に対応する第２予測凝縮圧力が使用されるため、圧縮機回転数が速やかに第２基準凝縮圧力近くまで回復する。その結果、圧縮機回転数を第１基準凝縮圧力と第２基準凝縮圧力との間で精度よく変動させることができ、圧縮機回転数が下がり過ぎることも防止できるため、圧縮機の運転効率を高いレベルで維持することができる。   In the control for increasing the compressor speed to the target speed as the speed control, the second predicted condensing pressure corresponding to the target speed is used. Recover to near. As a result, the compressor speed can be accurately varied between the first reference condensing pressure and the second reference condensing pressure, and the compressor speed can be prevented from being excessively reduced. Can be maintained at a high level.

また、上記空気調和機は、前記回転数規制制御において、前記第２予測凝縮圧力が前記第２基準凝縮圧力未満となり、前記圧縮機回転数を前記目標回転数にまで上げる場合の前記圧縮機回転数の上昇速度は、前記通常制御で前記圧縮機回転数を上昇させる場合の上昇速度よりも遅くされる構成とすることができる。   Further, in the air conditioner, in the rotation speed regulation control, the compressor rotation speed when the second predicted condensation pressure becomes less than the second reference condensation pressure and the compressor rotation speed is increased to the target rotation speed. The increase speed of the number may be configured to be lower than the increase speed when the compressor rotation speed is increased by the normal control.

上記の構成によれば、回転数規制制御において圧縮機回転数を目標回転数にまで上げる場合に、圧縮機回転数の上昇速度を遅くすることにより、急激なサイクル状態の変化をより確実に抑え、圧縮機の回転数変動をより小さくすることができる。   According to the above configuration, in the case where the compressor rotation speed is increased to the target rotation speed in the rotation speed regulation control, a rapid change in the cycle state is more reliably suppressed by reducing the rising speed of the compressor rotation speed. In addition, fluctuations in the rotational speed of the compressor can be reduced.

また、上記空気調和機では、前記凝縮圧力算出部は、凝縮器雰囲気温度によって補正される前記第１予測凝縮圧力および前記第２予測凝縮圧力を求める構成とすることができる。   Further, in the air conditioner, the condensing pressure calculating unit may be configured to obtain the first predicted condensing pressure and the second predicted condensing pressure corrected by a condenser ambient temperature.

上記の構成によれば、第１予測凝縮圧力および第２予測凝縮圧力を凝縮器雰囲気温度で補正されたものとして求めることで、予測凝縮圧力の精度を高めることができ、空気調和機の運転効率をより向上させることができる。   According to the above configuration, the accuracy of the predicted condensing pressure can be improved by obtaining the first predicted condensing pressure and the second predicted condensing pressure as corrected at the condenser ambient temperature, and the operating efficiency of the air conditioner can be improved. Can be further improved.

本発明の空気調和機は、圧縮機回転数を第１基準凝縮圧力と第２基準凝縮圧力との間で精度よく変動させることができ、圧縮機の回転数変動を低減しながらも、圧縮機の運転効率を高いレベルで維持することができるといった効果を奏する。   ADVANTAGE OF THE INVENTION The air conditioner of this invention can fluctuate | variate a compressor rotation speed between a 1st reference | standard condensation pressure and a 2nd reference | standard condensation pressure accurately, and, while reducing the rotation number fluctuation of a compressor, a compressor. The operation efficiency can be maintained at a high level.

実施の形態１に係る空気調和機の概略構成図である。FIG. 1 is a schematic configuration diagram of an air conditioner according to Embodiment 1. 実施の形態１に係る空気調和機の制御系を示すブロック図である。FIG. 3 is a block diagram showing a control system of the air conditioner according to Embodiment 1. 実施の形態１に係る空気調和機の回転数規制制御を示すフローチャートである。4 is a flowchart illustrating rotation speed regulation control of the air conditioner according to Embodiment 1. 冷凍サイクルの凝縮圧力と圧縮機の電流値および回転数との相関を示すグラフである。4 is a graph showing a correlation between a condensing pressure of a refrigeration cycle and a current value and a rotation speed of a compressor. 実施の形態２に係る空気調和機の回転数規制制御を示すフローチャートである。9 is a flowchart illustrating rotation speed regulation control of the air conditioner according to Embodiment 2. 実施の形態３に係る空気調和機の回転数規制制御を示すフローチャートである。9 is a flowchart illustrating rotation speed regulation control of the air conditioner according to Embodiment 3. 実施の形態４に係る空気調和機の制御系を示すブロック図である。FIG. 13 is a block diagram showing a control system of an air conditioner according to Embodiment 4. 実施の形態４に係る空気調和機の回転数規制制御を示すフローチャートである。15 is a flowchart illustrating rotation speed regulation control of the air conditioner according to Embodiment 4.

〔実施の形態１〕
以下、本発明の実施の形態１について、図面を参照して詳細に説明する。図１は、本実施の形態１に係る空気調和機１０の概略構成図であり、空気調和機１０において適用される冷凍サイクルを示している。 [Embodiment 1]
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of an air conditioner 10 according to Embodiment 1 and shows a refrigeration cycle applied to the air conditioner 10.

空気調和機１０は、室内ユニット１００および室外ユニット１１０により構成されている。空気調和機１０における冷凍サイクルの経路上には、室内ユニット１００側に室内熱交換器１０１が備えられており、室外ユニット１１０側に圧縮機１１１、室外熱交換器１１２、四方弁１１３および膨張弁１１４が備えられている。また、室内ユニット１００には、室内熱交換器１０１で熱交換された空気を室内に送り出すための室内ファン１０２が備えられており、室外ユニット１１０には、室外熱交換器１１２に空気を送るための室外ファン１１５が備えられている。   The air conditioner 10 includes an indoor unit 100 and an outdoor unit 110. On the path of the refrigeration cycle in the air conditioner 10, an indoor heat exchanger 101 is provided on the indoor unit 100 side, and a compressor 111, an outdoor heat exchanger 112, a four-way valve 113 and an expansion valve are provided on the outdoor unit 110 side. 114 are provided. Further, the indoor unit 100 is provided with an indoor fan 102 for sending out the air heat exchanged by the indoor heat exchanger 101 into the room, and the outdoor unit 110 is for sending air to the outdoor heat exchanger 112. Outdoor fan 115 is provided.

四方弁１１３は、空気調和機１０の暖房／冷房運転に応じて、冷媒の循環の向きを切り替えるものである（図１は暖房運転時の状態を示している）。暖房運転時には、圧縮機１１１、四方弁１１３、室内熱交換器１０１、膨張弁１１４、室外熱交換器１１２、四方弁１１３、圧縮機１１１の順で冷媒が循環する。すなわち、暖房運転時には、室内熱交換器１０１が凝縮器、室外熱交換器１１２が蒸発器として機能する。   The four-way valve 113 switches the direction of circulation of the refrigerant according to the heating / cooling operation of the air conditioner 10 (FIG. 1 shows a state during the heating operation). During the heating operation, the refrigerant circulates in the order of the compressor 111, the four-way valve 113, the indoor heat exchanger 101, the expansion valve 114, the outdoor heat exchanger 112, the four-way valve 113, and the compressor 111. That is, during the heating operation, the indoor heat exchanger 101 functions as a condenser, and the outdoor heat exchanger 112 functions as an evaporator.

一方、冷房運転時には、圧縮機１１１、四方弁１１３、室外熱交換器１１２、膨張弁１１４、室内熱交換器１０１、四方弁１１３、圧縮機１１１の順で冷媒が循環する。すなわち、冷房運転時には、室外熱交換器１１２が凝縮器、室内熱交換器１０１が蒸発器として機能する。   On the other hand, during the cooling operation, the refrigerant circulates in the order of the compressor 111, the four-way valve 113, the outdoor heat exchanger 112, the expansion valve 114, the indoor heat exchanger 101, the four-way valve 113, and the compressor 111. That is, during the cooling operation, the outdoor heat exchanger 112 functions as a condenser, and the indoor heat exchanger 101 functions as an evaporator.

さらに、空気調和機１０は、室内熱交換器１０１付近に室温センサ１２１を有しており、室外熱交換器１１２付近に外気温センサ１２２を有している。室温センサ１２１は、室内熱交換器１０１における吸込空気の温度を室温として検知する。外気温センサ１２２は、室外熱交換器１１２における吸込空気の温度を外気温度として検知する。   Further, the air conditioner 10 has a room temperature sensor 121 near the indoor heat exchanger 101 and an outside air temperature sensor 122 near the outdoor heat exchanger 112. The room temperature sensor 121 detects the temperature of the intake air in the indoor heat exchanger 101 as room temperature. The outside air temperature sensor 122 detects the temperature of the intake air in the outdoor heat exchanger 112 as the outside air temperature.

図２は、空気調和機１０の制御系を示すブロック図である。但し、図２では、圧縮機１１１の回転数制御に関する構成のみを示している。空気調和機１０は、制御部２０によって圧縮機１１１の回転数制御を行っており、制御部２０は、主制御部２０１、凝縮圧力算出部２０２、閾値格納部２０３および温度差−回転数テーブル２０４を具備している。また、主制御部２０１は、圧縮機１１１および室温センサ１２１とも接続されている。   FIG. 2 is a block diagram illustrating a control system of the air conditioner 10. However, FIG. 2 shows only the configuration related to the rotation speed control of the compressor 111. In the air conditioner 10, the control unit 20 controls the rotation speed of the compressor 111, and the control unit 20 includes a main control unit 201, a condensing pressure calculation unit 202, a threshold storage unit 203, and a temperature difference-rotation speed table 204. Is provided. Further, the main control unit 201 is also connected to the compressor 111 and the room temperature sensor 121.

空気調和機１０は、圧縮機１１１の通常制御として、室温と設定温度との温度差に応じて圧縮機回転数を変化させる運転制御を行っている。この運転制御では、室温センサ１２１にて検知される現在の室温が主制御部２０１に入力され、主制御部２０１は室温と設定温度との温度差を求める。さらに、主制御部２０１は、この温度差を温度差−回転数テーブル２０４への入力パラメータとして圧縮機１１１の目標回転数を求め、圧縮機１１１の回転数が目標回転数となるように圧縮機１１１を制御する。すなわち、温度差−回転数テーブル２０４には、室温と設定温度との温度差と、圧縮機１１１の目標回転数とが対応付けて格納されている。尚、本実施の形態では、主制御部２０１が特許請求の範囲に記載の回転数制御部に相当する。   The air conditioner 10 performs, as normal control of the compressor 111, operation control of changing the compressor rotation speed according to a temperature difference between room temperature and a set temperature. In this operation control, the current room temperature detected by the room temperature sensor 121 is input to the main control unit 201, and the main control unit 201 obtains a temperature difference between the room temperature and the set temperature. Further, the main control unit 201 obtains the target rotation speed of the compressor 111 using the temperature difference as an input parameter to the temperature difference-rotation speed table 204, and sets the compressor rotation speed so that the rotation speed of the compressor 111 becomes the target rotation speed. 111 is controlled. That is, the temperature difference-rotation speed table 204 stores the temperature difference between the room temperature and the set temperature and the target rotation speed of the compressor 111 in association with each other. In the present embodiment, the main control unit 201 corresponds to a rotation speed control unit described in the claims.

温度差−回転数テーブル２０４を用いた通常制御により、空気調和機１０では、室温と設定温度との温度差が大きい時は空気調和機の運転能力を上げることで室温を速やかに設定温度に近づけ、室温と設定温度との温度差が小さい時は空気調和機の運転能力を下げることで室温が設定温度付近で維持される。   With the normal control using the temperature difference-rotation speed table 204, in the air conditioner 10, when the temperature difference between the room temperature and the set temperature is large, the operating capacity of the air conditioner is increased to quickly bring the room temperature close to the set temperature. When the temperature difference between the room temperature and the set temperature is small, the room temperature is maintained near the set temperature by reducing the operation capacity of the air conditioner.

また、空気調和機１０では、圧縮機１１１に対して過大な負荷が掛からないように、冷凍サイクルの凝縮圧力が許容ラインを超えないようにする必要があり、そのための圧縮機１１１の回転数の制御も必要となる。すなわち、圧縮機１１１に対して、上述の通常制御のみでは凝縮圧力が許容ラインを超える場合があるので、その場合は圧縮機１１１の回転数を通常制御で求められる目標回転数よりも下げる必要がある。   Further, in the air conditioner 10, it is necessary to prevent the condensing pressure of the refrigeration cycle from exceeding an allowable line so that an excessive load is not applied to the compressor 111. Control is also needed. That is, for the compressor 111, the condensing pressure may exceed the allowable line only with the above-described normal control, and in that case, the rotation speed of the compressor 111 needs to be lower than the target rotation speed obtained by the normal control. is there.

続いて、本実施の形態１に係る空気調和機１０の特徴である、凝縮圧力が許容ラインを超えないようにするための圧縮機１１１の回転数規制制御について、図３のフローチャートを参照して説明する。   Next, with reference to the flowchart of FIG. 3, the control of the rotation speed of the compressor 111 for preventing the condensing pressure from exceeding the allowable line, which is a feature of the air conditioner 10 according to Embodiment 1, will be described. explain.

この回転数規制制御では、最初に圧縮機１１１の目標回転数ｎ２が決定される（Ｓ１）。この目標回転数ｎ２は、上述した通常制御によって、すなわち室温と設定温度との温度差から温度差−回転数テーブル２０４によって求められるものである。   In the rotation speed regulation control, first, a target rotation speed n2 of the compressor 111 is determined (S1). The target rotation speed n2 is obtained by the normal control described above, that is, from the temperature difference between the room temperature and the set temperature by the temperature difference-rotation speed table 204.

続いて、圧縮機１１１における現在の電流値Ｉが電流センサ１３０（電流検知部：図２参照）によって検知される（Ｓ２）。この電流センサ１３０は、圧縮機１１１の給電回路に設けられており、検知された電流値Ｉは凝縮圧力算出部２０２に入力される。また、凝縮圧力算出部２０２には、主制御部２０１から、圧縮機１１１の現在の回転数ｎ１（主制御部２０１が圧縮機１１１を制御する制御回転数）も入力される。   Then, the current value I in the compressor 111 is detected by the current sensor 130 (current detection unit: see FIG. 2) (S2). The current sensor 130 is provided in a power supply circuit of the compressor 111, and the detected current value I is input to the condensing pressure calculation unit 202. The condensing pressure calculation unit 202 also receives the current rotation speed n1 of the compressor 111 (the control rotation speed at which the main control unit 201 controls the compressor 111) from the main control unit 201.

凝縮圧力算出部２０２は、入力された電流値Ｉと回転数ｎ１とに基づき、第１予測凝縮圧力Ｐｄを求める（Ｓ３）。一般に冷凍サイクルの凝縮圧力は、図４に示すように、圧縮機の電流値と回転数とに対して相関を示すものである。このため、予め実験などを行うことで、第１予測凝縮圧力Ｐｄを電流値Ｉと回転数ｎ１との関数（Ｐｄ＝ｆ（Ｉ，ｎ１））で規定することができる。そして、予め規定された関数式に電流値Ｉと回転数ｎ１とを入力することで第１予測凝縮圧力Ｐｄを算出できる。また、第１予測凝縮圧力Ｐｄの求め方は、関数式を用いて算出する方法には限定されない。例えば、電流値Ｉおよび回転数ｎ１と第１予測凝縮圧力Ｐｄとを対応付けたテーブルを作成しておき、このテーブルに電流値Ｉおよび回転数ｎ１を入力して第１予測凝縮圧力Ｐｄを読み出すようにしてもよい。   The condensing pressure calculation unit 202 obtains a first predicted condensing pressure Pd based on the input current value I and the rotation speed n1 (S3). Generally, as shown in FIG. 4, the condensing pressure of the refrigeration cycle shows a correlation between the current value of the compressor and the rotation speed. Therefore, by conducting an experiment or the like in advance, the first predicted condensation pressure Pd can be defined by a function (Pd = f (I, n1)) of the current value I and the rotation speed n1. Then, the first predicted condensing pressure Pd can be calculated by inputting the current value I and the rotation speed n1 into a predefined function formula. Further, the method of obtaining the first predicted condensing pressure Pd is not limited to the method of calculating using the functional equation. For example, a table is created in which the current value I and the number of revolutions n1 are associated with the first predicted condensing pressure Pd, and the current value I and the number of revolutions n1 are input to this table to read out the first predicted condensing pressure Pd. You may do so.

凝縮圧力算出部２０２で求められた第１予測凝縮圧力Ｐｄは主制御部２０１に入力され、主制御部２０１は、第１予測凝縮圧力Ｐｄと第１基準凝縮圧力Ｐｄｓとを比較し、第１予測凝縮圧力Ｐｄが第１基準凝縮圧力Ｐｄｓ以上であるか否かを判定する（Ｓ４）。ここで、第１基準凝縮圧力Ｐｄｓは、凝縮圧力の許容上限値であり、圧縮機１１１の仕様として規定されている最大圧力よりも低い値とされている。また、第１基準凝縮圧力Ｐｄｓは、閾値格納部２０３に予め格納されている。   The first predicted condensing pressure Pd obtained by the condensing pressure calculating unit 202 is input to the main control unit 201, and the main control unit 201 compares the first predicted condensing pressure Pd with the first reference condensing pressure Pds, and It is determined whether or not the predicted condensation pressure Pd is equal to or higher than the first reference condensation pressure Pds (S4). Here, the first reference condensing pressure Pds is an allowable upper limit value of the condensing pressure, and is set to a value lower than the maximum pressure specified as the specification of the compressor 111. Further, the first reference condensation pressure Pds is stored in the threshold value storage unit 203 in advance.

第１予測凝縮圧力Ｐｄが第１基準凝縮圧力Ｐｄｓ以上である場合（Ｓ４でＹＥＳ）、主制御部２０１は圧縮機１１１の回転数を下げる運転制御を行う（Ｓ５）。電流値Ｉと回転数ｎ１とから求められる第１予測凝縮圧力Ｐｄは、実際の凝縮圧力に対して時間遅れを生じるものではなく、Ｓ５の運転制御は、空気調和機１０の風量が突然変更された場合や圧縮機１１１の回転数が変動した場合などにも反応遅れを生じない。このため、凝縮圧力が圧縮機１１１の仕様として規定されている最大圧力を超えることを確実に防止できる。尚、Ｓ５の運転制御は、圧縮機１１１の回転数を所定回転数（ｒｐｓ）だけ一度に下げる制御であってもよく、あるいは、圧縮機１１１の回転数を所定変化率（ｒｐｓ／ｓｅｃ）で減少させる制御であってもよい。   When the first predicted condensing pressure Pd is equal to or higher than the first reference condensing pressure Pds (YES in S4), the main control unit 201 performs operation control for reducing the rotation speed of the compressor 111 (S5). The first predicted condensing pressure Pd obtained from the current value I and the rotation speed n1 does not cause a time delay with respect to the actual condensing pressure, and the operation control in S5 is such that the air volume of the air conditioner 10 is suddenly changed. When the rotation speed of the compressor 111 fluctuates, no reaction delay occurs. For this reason, it is possible to reliably prevent the condensing pressure from exceeding the maximum pressure specified as the specification of the compressor 111. The operation control in S5 may be control to reduce the rotation speed of the compressor 111 by a predetermined rotation speed (rps) at a time, or may reduce the rotation speed of the compressor 111 at a predetermined change rate (rps / sec). Control to decrease the value may be used.

第１予測凝縮圧力Ｐｄが第１基準凝縮圧力Ｐｄｓ未満である場合（Ｓ４でＮＯ）は、凝縮圧力算出部２０２が、入力された電流値Ｉと目標回転数ｎ２とに基づき、目標回転数ｎ２に対応する第２予測凝縮圧力Ｐｄ２を求める（Ｓ６）。この第２予測凝縮圧力Ｐｄ２は、第１予測凝縮圧力Ｐｄとは入力される圧縮機回転数が異なるのみであるので、第１予測凝縮圧力Ｐｄと同様の方法で求めることができる。   When the first predicted condensing pressure Pd is lower than the first reference condensing pressure Pds (NO in S4), the condensing pressure calculating unit 202 calculates the target rotation speed n2 based on the input current value I and the target rotation speed n2. Is calculated (S6). Since the second predicted condensing pressure Pd2 is different from the first predicted condensing pressure Pd only in the input compressor rotation speed, the second predicted condensing pressure Pd2 can be obtained in the same manner as the first predicted condensing pressure Pd.

凝縮圧力算出部２０２で求められた第２予測凝縮圧力Ｐｄ２は主制御部２０１に入力され、主制御部２０１は、第２予測凝縮圧力Ｐｄ２と第２基準凝縮圧力Ｐｄｓ２とを比較し、第２予測凝縮圧力Ｐｄ２が第２基準凝縮圧力Ｐｄｓ２以上であるか否かを判定する（Ｓ７）。ここで、第２基準凝縮圧力Ｐｄｓ２は、Ｓ５の運転制御の終了を判定するための下限閾値であり、第１基準凝縮圧力Ｐｄｓよりも小さな値とされている。また、第２基準凝縮圧力Ｐｄｓ２は、閾値格納部２０３に予め格納されている。   The second predicted condensing pressure Pd2 obtained by the condensing pressure calculating unit 202 is input to the main control unit 201, and the main control unit 201 compares the second predicted condensing pressure Pd2 with the second reference condensing pressure Pds2, and It is determined whether the predicted condensation pressure Pd2 is equal to or higher than the second reference condensation pressure Pds2 (S7). Here, the second reference condensing pressure Pds2 is a lower limit threshold value for determining the end of the operation control in S5, and is set to a value smaller than the first reference condensing pressure Pds. Further, the second reference condensation pressure Pds2 is stored in the threshold value storage unit 203 in advance.

第２予測凝縮圧力Ｐｄ２が第２基準凝縮圧力Ｐｄｓ２以上である場合（Ｓ７でＹＥＳ）、圧縮機１１１の運転制御は変更されることなく処理はＳ２へ戻る。すなわち、Ｓ５の運転制御が行われている場合、その運転制御は継続される（Ｓ５の運転制御で下げられた圧縮機１１１の回転数が維持される）。これは、第２予測凝縮圧力Ｐｄ２が第２基準凝縮圧力Ｐｄｓ２以上である状態で圧縮機１１１の回転数制御を通常制御に戻して回転数を目標回転数ｎ２とすると、その後、短時間で再び第１予測凝縮圧力Ｐｄが第１基準凝縮圧力Ｐｄｓ以上となり、圧縮機１１１の回転数変動が頻繁となる虞があるためである。   If the second predicted condensing pressure Pd2 is equal to or higher than the second reference condensing pressure Pds2 (YES in S7), the process returns to S2 without changing the operation control of the compressor 111. That is, when the operation control of S5 is being performed, the operation control is continued (the rotation speed of the compressor 111 reduced by the operation control of S5 is maintained). This is because if the rotation speed control of the compressor 111 is returned to the normal control in a state where the second predicted condensation pressure Pd2 is equal to or higher than the second reference condensation pressure Pds2 and the rotation speed is set to the target rotation speed n2, then the speed is again reduced in a short time. This is because the first predicted condensing pressure Pd becomes equal to or higher than the first reference condensing pressure Pds, and the rotation speed of the compressor 111 may fluctuate frequently.

第２予測凝縮圧力Ｐｄ２が第２基準凝縮圧力Ｐｄｓ２未満である場合（Ｓ７でＮＯ）、圧縮機１１１の回転数制御が通常制御に戻され、主制御部２０１は圧縮機１１１の回転数を目標回転数ｎ２まで上昇させる（Ｓ８）。尚、Ｓ８では、圧縮機１１１の回転数制御が通常制御に戻されることで、圧縮機１１１の回転数が目標回転数ｎ２に到達するまで、所定変化率（ｒｐｓ／ｓｅｃ）で圧縮機１１１の回転数が上昇させられる。   When the second predicted condensing pressure Pd2 is less than the second reference condensing pressure Pds2 (NO in S7), the rotation speed control of the compressor 111 is returned to the normal control, and the main control unit 201 sets the rotation speed of the compressor 111 to the target speed. The rotation speed is increased to n2 (S8). In S8, the rotation speed control of the compressor 111 is returned to the normal control, and the rotation speed of the compressor 111 is changed at a predetermined rate (rps / sec) until the rotation speed of the compressor 111 reaches the target rotation speed n2. The speed is increased.

このように、第２予測凝縮圧力Ｐｄ２が第２基準凝縮圧力Ｐｄｓ２未満である状態で圧縮機１１１の回転数制御を通常制御に戻すことで、圧縮機１１１の回転数変動が頻繁となることを防止できる。一方で、Ｓ７の判定には、目標回転数ｎ２に対応する第２予測凝縮圧力Ｐｄ２が使用されるため、Ｓ８において圧縮機１１１の回転数制御が通常制御に戻された後は、圧縮機１１１の回転数が速やかに第２基準凝縮圧力Ｐｄｓ２近くまで回復する。すなわち、圧縮機１１１の回転数が下がり過ぎることも防止でき、圧縮機１１１の運転効率を可能な限り高いレベルで維持することができる。   As described above, by returning the rotation speed control of the compressor 111 to the normal control in a state where the second predicted condensation pressure Pd2 is lower than the second reference condensation pressure Pds2, the rotation speed of the compressor 111 frequently changes. Can be prevented. On the other hand, since the second predicted condensing pressure Pd2 corresponding to the target rotation speed n2 is used in the determination in S7, after the rotation speed control of the compressor 111 is returned to the normal control in S8, the compressor 111 Quickly recovers to near the second reference condensation pressure Pds2. That is, it is possible to prevent the rotational speed of the compressor 111 from being too low, and to maintain the operating efficiency of the compressor 111 at a level as high as possible.

言い換えれば、Ｓ７において第２基準凝縮圧力Ｐｄｓ２と比較される第２予測凝縮圧力Ｐｄ２を目標回転数ｎ２から求めることにより、圧縮機１１１の回転数を目標回転数ｎ２に変更した場合に、変更後の凝縮圧力が第２基準凝縮圧力Ｐｄｓ２を超えるかどうかが予め判断されることになる。その結果、圧縮機１１１の回転数を第１基準凝縮圧力Ｐｄｓと第２基準凝縮圧力Ｐｄｓ２との間で精度よく変動させることができ、運転効率を高いレベルで維持することができる。   In other words, when the second predicted condensation pressure Pd2 to be compared with the second reference condensation pressure Pds2 in S7 is determined from the target rotation speed n2, when the rotation speed of the compressor 111 is changed to the target rotation speed n2, It is determined in advance whether or not the condensation pressure exceeds the second reference condensation pressure Pds2. As a result, the rotation speed of the compressor 111 can be accurately changed between the first reference condensation pressure Pds and the second reference condensation pressure Pds2, and the operation efficiency can be maintained at a high level.

〔実施の形態２〕
上記実施の形態１における回転数規制制御では、図３のフローチャートのＳ８において、圧縮機１１１の回転数制御を通常制御に戻し、圧縮機１１１の回転数が目標回転数ｎ２に到達するまで所定変化率（ｒｐｓ／ｓｅｃ）で圧縮機１１１の回転数を上昇させている。これに対し、本実施の形態２における回転数規制制御は図５に示すものとなる。図５に示す回転数規制制御において、Ｓ１〜Ｓ７の処理は実施の形態１における図３のフローチャートと同じである。 [Embodiment 2]
In the rotation speed regulation control in the first embodiment, in S8 of the flowchart of FIG. 3, the rotation speed control of the compressor 111 is returned to the normal control, and the rotation speed of the compressor 111 is changed by a predetermined amount until the rotation speed of the compressor 111 reaches the target rotation speed n2. The rotation speed of the compressor 111 is increased at a rate (rps / sec). On the other hand, the rotation speed regulation control according to the second embodiment is as shown in FIG. In the rotation speed regulation control shown in FIG. 5, the processing of S1 to S7 is the same as the flowchart of FIG.

図５のフローチャートでは、Ｓ７でＹＥＳの場合、Ｓ１８において圧縮機１１１の回転数が目標回転数ｎ２に到達するまで上昇させられることは、図３のフローチャートのＳ８と同じである。但し、この時の回転数の上昇速度はＳ８の場合よりも遅くされる。すなわち、Ｓ１８で圧縮機１１１の回転数を上昇させる時の変化率は、通常制御で圧縮機１１１の回転数を変動させる場合の所定変化率よりも小さい変化率とされる。   In the flowchart of FIG. 5, in the case of YES in S7, the rotation speed of the compressor 111 is increased until reaching the target rotation speed n2 in S18, which is the same as S8 in the flowchart of FIG. However, the rising speed of the rotation speed at this time is made slower than in the case of S8. That is, the rate of change when increasing the number of revolutions of the compressor 111 in S18 is a rate of change smaller than the predetermined rate of change when changing the number of revolutions of the compressor 111 under normal control.

このように、本実施の形態２における回転数規制制御では、圧縮機１１１の回転数の上昇速度を遅くすることにより、急激なサイクル状態の変化をより確実に抑え、圧縮機１１１の回転数変動をより小さくすることができる。   As described above, in the rotation speed regulation control according to the second embodiment, a rapid change in the cycle state is suppressed more reliably by reducing the rising speed of the rotation speed of the compressor 111, and the fluctuation in the rotation speed of the compressor 111 is suppressed. Can be made smaller.

〔実施の形態３〕
本実施の形態３における回転数規制制御について、図６のフローチャートを参照して説明する。図６に示す回転数規制制御は、実施の形態１における図３のフローチャートと類似したものであるが、図３のＳ３，Ｓ４に代えてＳ２３，Ｓ２４を行い、Ｓ６，Ｓ７に代えてＳ２６，Ｓ２７を行っている。さらに、図６のＳ８の処理は、図５のＳ１８の処理に代えてもよい。 [Embodiment 3]
The rotation speed regulation control according to the third embodiment will be described with reference to the flowchart in FIG. The rotation speed regulation control shown in FIG. 6 is similar to the flowchart of FIG. 3 in the first embodiment, except that S23 and S24 are performed instead of S3 and S4 in FIG. 3, and S26 and S26 are performed instead of S6 and S7. S27 is performed. Further, the processing of S8 of FIG. 6 may be replaced with the processing of S18 of FIG.

図３のＳ３では、空気調和機１０の冷房または暖房運転に関わらず、圧縮機１１１の第１予測凝縮圧力Ｐｄを電流値Ｉと回転数ｎ１とに基づいて求めていた。これに対し、図６のＳ３では、凝縮器雰囲気温度で補正された第１予測凝縮圧力Ｐｄ’を求めている。冷房運転時には、室外熱交換器１１２が凝縮器となるため、外気温センサ１２２にて検知される室外雰囲気温度Ｔｏｕｔが凝縮圧力算出部２０２に入力され、凝縮圧力算出部２０２は入力された電流値Ｉと回転数ｎ１と室外雰囲気温度Ｔｏｕｔとに基づき、第１予測凝縮圧力Ｐｄ’を求める。暖房運転時には、室内熱交換器１０１が凝縮器となるため、室温センサ１２１にて検知される室内雰囲気温度Ｔｉｎが凝縮圧力算出部２０２に入力され、凝縮圧力算出部２０２は入力された電流値Ｉと回転数ｎ１と室内雰囲気温度Ｔｉｎとに基づき、第１予測凝縮圧力Ｐｄ’を求める。尚、この場合の第１予測凝縮圧力Ｐｄ’も、予め実験などを行うことで、電流値Ｉと回転数ｎ１と凝縮器雰囲気温度との関数（冷房時：Ｐｄ＝ｆ（Ｉ，ｎ１，Ｔｏｕｔ）、暖房時：Ｐｄ＝ｆ（Ｉ，ｎ１，Ｔｉｎ））で規定することができる。   In S3 of FIG. 3, the first predicted condensing pressure Pd of the compressor 111 is obtained based on the current value I and the rotation speed n1 regardless of the cooling or heating operation of the air conditioner 10. On the other hand, in S3 of FIG. 6, the first predicted condensation pressure Pd 'corrected at the condenser ambient temperature is obtained. During the cooling operation, the outdoor heat exchanger 112 serves as a condenser, so that the outdoor atmosphere temperature Tout detected by the outside air temperature sensor 122 is input to the condensing pressure calculating unit 202, and the condensing pressure calculating unit 202 outputs the input current value. A first predicted condensing pressure Pd ′ is obtained based on I, the rotation speed n1, and the outdoor atmosphere temperature Tout. During the heating operation, since the indoor heat exchanger 101 serves as a condenser, the indoor atmosphere temperature Tin detected by the room temperature sensor 121 is input to the condensing pressure calculating unit 202, and the condensing pressure calculating unit 202 outputs the input current value I The first predicted condensing pressure Pd ′ is obtained based on the rotation speed n1 and the indoor atmosphere temperature Tin. In this case, the first predicted condensation pressure Pd ′ is also a function of the current value I, the number of rotations n1, and the condenser atmosphere temperature (at the time of cooling: Pd = f (I, n1, Tout)) by performing experiments in advance. ), Heating: Pd = f (I, n1, Tin)).

Ｓ２４では、Ｓ２３で求められた第１予測凝縮圧力Ｐｄ’が第１基準凝縮圧力Ｐｄｓと比較され、第１予測凝縮圧力Ｐｄ’が第１基準凝縮圧力Ｐｄｓ以上であるか否かが判定される。   In S24, the first predicted condensing pressure Pd 'obtained in S23 is compared with the first reference condensing pressure Pds, and it is determined whether the first predicted condensing pressure Pd' is equal to or higher than the first reference condensing pressure Pds. .

また、Ｓ２６で求められる第２予測凝縮圧力Ｐｄ２’は、第１予測凝縮圧力Ｐｄ’とは入力される圧縮機回転数が異なるのみであるので、第１予測凝縮圧力Ｐｄ’と同様の方法で求めることができる。Ｓ２７では、Ｓ２６で求められた第２予測凝縮圧力Ｐｄ２’が第２基準凝縮圧力Ｐｄｓ２と比較され、第２予測凝縮圧力Ｐｄ２’が第２基準凝縮圧力Ｐｄｓ２以上であるか否かが判定される。   Further, the second predicted condensing pressure Pd2 ′ obtained in S26 is different from the first predicted condensing pressure Pd ′ only in the input compressor rotation speed, and is therefore similar to the first predicted condensing pressure Pd ′. You can ask. In S27, the second predicted condensing pressure Pd2 'obtained in S26 is compared with the second reference condensing pressure Pds2, and it is determined whether the second predicted condensing pressure Pd2' is equal to or higher than the second reference condensing pressure Pds2. .

このように、本実施の形態３における回転数規制制御では、第１予測凝縮圧力Ｐｄ’および第２予測凝縮圧力Ｐｄ２’を凝縮器雰囲気温度で補正されたものとして求めることで、予測凝縮圧力の精度を高めることができ、空気調和機１０の運転効率をより向上させることができる。   As described above, in the rotation speed regulation control according to the third embodiment, the first predicted condensing pressure Pd ′ and the second predicted condensing pressure Pd2 ′ are obtained as corrected at the condenser ambient temperature, thereby obtaining the predicted condensing pressure. Accuracy can be improved, and operation efficiency of the air conditioner 10 can be further improved.

〔実施の形態４〕
実施の形態１〜３では予測凝縮圧力を求め、この予測凝縮圧力に基づいて圧縮機１１１の回転数規制制御を行っていた。これに対し、本実施の形態４では、基準凝縮圧力に相当する基準電流を求め、この基準電流に基づいて圧縮機１１１の回転数規制制御を行う。本実施の形態４における回転数規制制御について、図７および図８を参照して説明する。 [Embodiment 4]
In the first to third embodiments, the predicted condensing pressure is obtained, and the rotation speed regulation control of the compressor 111 is performed based on the predicted condensing pressure. On the other hand, in the fourth embodiment, a reference current corresponding to the reference condensing pressure is obtained, and the rotation speed control of the compressor 111 is controlled based on the reference current. The rotation speed regulation control according to the fourth embodiment will be described with reference to FIG. 7 and FIG.

図７は、本実施の形態４に係る空気調和機１０の制御系を示すブロック図である。図７に示す制御部２１は、図２に示す制御部２０と類似した構成であるが、凝縮圧力算出部２０２に代えて基準電流算出部２１２を有しており、閾値格納部２０３は有していない。また、主制御部２０１は、圧縮機１１１、室温センサ１２１および外気温センサ１２２とも接続されている。   FIG. 7 is a block diagram illustrating a control system of an air conditioner 10 according to Embodiment 4. The control unit 21 illustrated in FIG. 7 has a configuration similar to that of the control unit 20 illustrated in FIG. 2, but includes a reference current calculation unit 212 instead of the condensation pressure calculation unit 202 and a threshold storage unit 203. Not. The main control unit 201 is also connected to the compressor 111, the room temperature sensor 121, and the outside air temperature sensor 122.

図８は、本実施の形態４に係る空気調和機の回転数規制制御を示すフローチャートである。図８に示す回転数規制制御では、最初に圧縮機１１１の目標回転数ｎ２が決定される（Ｓ１）。続いて、圧縮機１１１における現在の電流値Ｉが電流センサ１３０（図７参照）によって検知される（Ｓ２）。Ｓ１およびＳ２の処理は、図３に示す回転数規制制御と同じである。   FIG. 8 is a flowchart illustrating the rotation speed regulation control of the air conditioner according to Embodiment 4. In the rotation speed regulation control shown in FIG. 8, first, the target rotation speed n2 of the compressor 111 is determined (S1). Next, the current value I of the compressor 111 is detected by the current sensor 130 (see FIG. 7) (S2). The processing of S1 and S2 is the same as the rotation speed regulation control shown in FIG.

基準電流算出部２１２は、圧縮機１１１における現在の回転数ｎ１と凝縮器雰囲気温度とに基づき、第１基準凝縮圧力Ｐｄｓに相当する第１基準電流Ｉｓを求める（Ｓ３３）。凝縮器雰囲気温度は、冷房時は外気温センサ１２２にて検知される室外雰囲気温度Ｔｏｕｔであり、暖房時は室温センサ１２１にて検知される室内雰囲気温度Ｔｉｎである。また、第１基準電流Ｉｓは、現在の回転数ｎ１と凝縮器雰囲気温度との下で第１基準凝縮圧力Ｐｄｓとなる電流を意味している。この場合の第１基準電流Ｉｓも、予め実験などを行うことで、回転数ｎ１と凝縮器雰囲気温度との関数（冷房時：Ｉｓ＝ｆ（ｎ１，Ｔｏｕｔ）、暖房時：Ｉｓ＝ｆ（ｎ１，Ｔｉｎ））で規定することができる。   The reference current calculation unit 212 obtains a first reference current Is corresponding to the first reference condensation pressure Pds based on the current rotational speed n1 of the compressor 111 and the condenser ambient temperature (S33). The condenser atmosphere temperature is the outdoor atmosphere temperature Tout detected by the outside air temperature sensor 122 during cooling, and the indoor atmosphere temperature Tin detected by the room temperature sensor 121 during heating. Further, the first reference current Is means a current that becomes the first reference condensation pressure Pds under the current rotational speed n1 and the condenser ambient temperature. In this case, the first reference current Is is also a function of the rotation speed n1 and the condenser ambient temperature (cooling: Is = f (n1, Tout), heating: Is = f (n1) , Tin)).

尚、Ｓ３３では、第１基準電流Ｉｓを求めるのに凝縮器雰囲気温度も用いているが、この凝縮器雰囲気温度は、実施の形態３における第１予測凝縮圧力Ｐｄ’の算出時と同様に、温度補正によって第１基準電流Ｉｓの精度を高めるために用いられているものである。すなわち、第１基準電流Ｉｓを求める上で凝縮器雰囲気温度は必須ではなく、圧縮機１１１の回転数ｎ１のみから第１基準電流Ｉｓを求めることも可能である。   In S33, the condenser ambient temperature is also used to determine the first reference current Is. However, this condenser ambient temperature is the same as in the calculation of the first predicted condensation pressure Pd ′ in the third embodiment. This is used to improve the accuracy of the first reference current Is by temperature correction. That is, the condenser ambient temperature is not essential for obtaining the first reference current Is, and the first reference current Is can be obtained from only the rotation speed n1 of the compressor 111.

基準電流算出部２１２で求められた第１基準電流Ｉｓは主制御部２０１に入力され、主制御部２０１は、第１基準電流ＩｓとＳ２で検知された電流値Ｉとを比較し、電流値Ｉが第１基準電流Ｉｓ以上であるか否かを判定する（Ｓ３４）。電流値Ｉが第１基準電流Ｉｓ以上である場合（Ｓ３４でＹＥＳ）、主制御部２０１は圧縮機１１１の回転数を下げる運転制御を行う（Ｓ５）。Ｓ３４の判定は、実際の凝縮圧力に対して時間遅れを生じることなく判定可能であり、Ｓ５の運転制御は、空気調和機１０の風量が突然変更された場合や圧縮機１１１の回転数が変動した場合などにも反応遅れを生じない。このため、凝縮圧力が圧縮機１１１の仕様として規定されている最大圧力を超えることを確実に防止できる。   The first reference current Is obtained by the reference current calculation unit 212 is input to the main control unit 201, and the main control unit 201 compares the first reference current Is with the current value I detected in S2, It is determined whether I is equal to or greater than the first reference current Is (S34). If the current value I is equal to or greater than the first reference current Is (YES in S34), the main control unit 201 performs operation control to reduce the rotation speed of the compressor 111 (S5). The determination in S34 can be made without a time delay with respect to the actual condensing pressure. The operation control in S5 is performed when the air volume of the air conditioner 10 is suddenly changed or when the rotation speed of the compressor 111 fluctuates. No reaction delay occurs even in the event of a collision. For this reason, it is possible to reliably prevent the condensing pressure from exceeding the maximum pressure specified as the specification of the compressor 111.

電流値Ｉが第１基準電流Ｉｓ未満である場合（Ｓ３４でＮＯ）は、基準電流算出部２１２が、目標回転数ｎ２と凝縮器雰囲気温度とに基づき、第２基準凝縮圧力Ｐｄｓ２に相当する第２基準電流Ｉｓ２を求める（Ｓ３６）。第２基準電流Ｉｓ２は、目標回転数ｎ２と凝縮器雰囲気温度との下で第２基準凝縮圧力Ｐｄｓ２となる電流を意味している。この第２基準電流Ｉｓ２は、第１基準電流Ｉｓと同様の方法で求めることができる。   When the current value I is less than the first reference current Is (NO in S34), the reference current calculation unit 212 determines the second reference condensation pressure Pds2 corresponding to the second reference condensation pressure Pds2 based on the target rotation speed n2 and the condenser atmosphere temperature. The two reference current Is2 is obtained (S36). The second reference current Is2 means a current that becomes the second reference condensation pressure Pds2 under the target rotation speed n2 and the condenser ambient temperature. The second reference current Is2 can be obtained in the same manner as the first reference current Is.

基準電流算出部２１２で求められた第２基準電流Ｉｓ２は主制御部２０１に入力され、主制御部２０１は、第２基準電流Ｉｓ２とＳ２で検知された電流値Ｉとを比較し、電流値Ｉが第２基準電流Ｉｓ２以上であるか否かを判定する（Ｓ３７）。   The second reference current Is2 obtained by the reference current calculation unit 212 is input to the main control unit 201, and the main control unit 201 compares the second reference current Is2 with the current value I detected by S2, It is determined whether I is equal to or greater than the second reference current Is2 (S37).

電流値Ｉが第２基準電流Ｉｓ２以上である場合（Ｓ３７でＹＥＳ）、圧縮機１１１の運転制御は変更されることなく処理はＳ２へ戻る。すなわち、Ｓ５の運転制御が行われている場合、その運転制御は継続される（Ｓ５の運転制御で下げられた圧縮機１１１の回転数が維持される）。   If the current value I is equal to or larger than the second reference current Is2 (YES in S37), the process returns to S2 without changing the operation control of the compressor 111. That is, when the operation control of S5 is being performed, the operation control is continued (the rotation speed of the compressor 111 reduced by the operation control of S5 is maintained).

電流値Ｉが第２基準電流Ｉｓ２未満である場合（Ｓ３７でＮＯ）、圧縮機１１１の回転数制御が通常制御に戻され、主制御部２０１は圧縮機１１１の回転数を目標回転数ｎ２まで上昇させる（Ｓ８）。尚、図８のＳ８の処理は、図５のＳ１８の処理に代えてもよい。   When the current value I is less than the second reference current Is2 (NO in S37), the rotation speed control of the compressor 111 is returned to the normal control, and the main control unit 201 reduces the rotation speed of the compressor 111 to the target rotation speed n2. It is raised (S8). The process in S8 in FIG. 8 may be replaced with the process in S18 in FIG.

このように、電流値Ｉが第２基準電流Ｉｓ２未満である状態で圧縮機１１１の回転数制御を通常制御に戻すことで、圧縮機１１１の回転数変動が頻繁となることを防止できる。一方で、Ｓ３７の判定には、第２基準凝縮圧力に相当し、かつ、目標回転数ｎ２に対応する第２基準電流Ｉｓ２が使用されるため、Ｓ８において圧縮機１１１の回転数制御が通常制御に戻された後は、圧縮機１１１の回転数が速やかに第２基準凝縮圧力Ｐｄｓ２近くまで回復する。すなわち、圧縮機１１１の回転数が下がり過ぎることも防止でき、圧縮機１１１の運転効率を可能な限り高いレベルで維持することができる。また、本実施の形態４の回転数規制制御では、予測凝縮圧力に代えて基準電流を算出しているが、これにより、予測凝縮圧力を算出する場合よりも制御部２１における負荷を低減することができる。   As described above, by returning the rotation speed control of the compressor 111 to the normal control in a state where the current value I is less than the second reference current Is2, it is possible to prevent the rotation speed of the compressor 111 from fluctuating frequently. On the other hand, since the second reference current Is2 corresponding to the second reference condensing pressure and corresponding to the target rotation speed n2 is used for the determination in S37, the rotation speed control of the compressor 111 is normally controlled in S8. , The rotational speed of the compressor 111 quickly recovers to near the second reference condensing pressure Pds2. That is, it is possible to prevent the rotational speed of the compressor 111 from being too low, and to maintain the operating efficiency of the compressor 111 at a level as high as possible. Further, in the rotation speed regulation control according to the fourth embodiment, the reference current is calculated instead of the predicted condensing pressure. However, it is possible to reduce the load on the control unit 21 as compared with the case where the predicted condensing pressure is calculated. Can be.

今回開示した実施形態はすべての点で例示であって、限定的な解釈の根拠となるものではない。したがって、本発明の技術的範囲は、上記した実施形態のみによって解釈されるものではなく、特許請求の範囲の記載に基づいて画定される。また、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれる。   The embodiment disclosed this time is an example in all respects, and is not a basis for restrictive interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the claims. In addition, all changes within the meaning and scope equivalent to the claims are included.

１０ 空気調和機
１００ 室内ユニット
１０１ 室内熱交換器
１０２ 室内ファン
１１０ 室外ユニット
１１１ 圧縮機
１１２ 室外熱交換器
１１３ 四方弁
１１４ 膨張弁
１１５ 室外ファン
１２１ 室温センサ
１２２ 外気温センサ
１３０ 電流センサ（電流検知部）
２０，２１ 制御部
２０１ 主制御部（回転数制御部）
２０２ 凝縮圧力算出部
２０３ 閾値格納部
２０４ 温度差−回転数テーブル
２１２ 基準電流算出部
Ｉ 現在の電流値
ｎ２ 目標回転数
ｎ１ 現在の回転数
Ｐｄ，Ｐｄ’ 第１予測凝縮圧力
Ｐｄ２，Ｐｄ２’ 第２予測凝縮圧力
Ｐｄｓ 第１基準凝縮圧力
Ｐｄｓ２ 第２基準凝縮圧力
Ｉｓ 第１基準電流
Ｉｓ２ 第２基準電流
Ｔｏｕｔ 室外雰囲気温度
Ｔｉｎ 室内雰囲気温度 Reference Signs List 10 air conditioner 100 indoor unit 101 indoor heat exchanger 102 indoor fan 110 outdoor unit 111 compressor 112 outdoor heat exchanger 113 four-way valve 114 expansion valve 115 outdoor fan 121 room temperature sensor 122 outside air temperature sensor 130 current sensor (current detection unit)
20, 21 control unit 201 main control unit (rotation speed control unit)
202 Condensed pressure calculation unit 203 Threshold storage unit 204 Temperature difference-rotation speed table 212 Reference current calculation unit I Current current value n2 Target rotation speed n1 Current rotation speed Pd, Pd 'First predicted condensation pressure Pd2, Pd2' Second Predicted condensation pressure Pds First reference condensation pressure Pds2 Second reference condensation pressure Is First reference current Is2 Second reference current Tout Outdoor atmosphere temperature Tin Indoor atmosphere temperature

Claims (6)

圧縮機を含む冷凍サイクルを用いた空気調和機であって、
前記圧縮機における現在の電流値を検知する電流検知部と、
基準凝縮圧力に相当する基準電流を、圧縮機回転数に基づいて算出する基準電流算出部と、
前記圧縮機回転数を制御する回転数制御部とを備えており、
前記回転数制御部は、
前記圧縮機回転数が、室温と設定温度との温度差に応じて設定される目標回転数となるように制御する通常制御と、
凝縮圧力が許容ラインを超えないように、前記圧縮機回転数を制御する回転数規制制御とを行うものであり、
前記基準電流算出部は、
第１基準凝縮圧力に相当する第１基準電流を、前記圧縮機の現在の回転数に基づいて算出すると共に、
前記第１基準凝縮圧力よりも小さい第２基準凝縮圧力に相当する第２基準電流を、前記圧縮機の前記目標回転数に基づいて算出するものであり、
前記回転数制御部は、前記回転数規制制御として、
前記電流検知部で検知される電流値が前記第１基準電流以上となったときに前記圧縮機回転数を下げる制御を行い、
前記電流検知部で検知される電流値が前記第２基準電流未満となったときに前記圧縮機回転数を前記目標回転数にまで上げる制御を行うことを特徴とする空気調和機。 An air conditioner using a refrigeration cycle including a compressor,
A current detection unit that detects a current value of the compressor,
A reference current calculator that calculates a reference current corresponding to the reference condensing pressure based on the compressor speed;
A rotation speed control unit for controlling the compressor rotation speed,
The rotation speed control unit,
Normal control for controlling the compressor speed to be a target speed set in accordance with a temperature difference between room temperature and a set temperature,
In order to prevent the condensing pressure from exceeding the allowable line, a rotational speed regulation control for controlling the compressor rotational speed is performed,
The reference current calculator,
Calculating a first reference current corresponding to a first reference condensing pressure based on a current rotational speed of the compressor;
Calculating a second reference current corresponding to a second reference condensation pressure smaller than the first reference condensation pressure based on the target rotation speed of the compressor;
The rotation speed control unit, as the rotation speed regulation control,
When the current value detected by the current detection unit is equal to or greater than the first reference current, control is performed to reduce the compressor speed,
An air conditioner, wherein when the current value detected by the current detection unit is less than the second reference current, control is performed to increase the compressor speed to the target speed. 請求項１に記載の空気調和機であって、
前記回転数規制制御において、前記電流検知部で検知される電流値が前記第２基準電流未満となり、前記圧縮機回転数を前記目標回転数にまで上げる場合の前記圧縮機回転数の上昇速度は、前記通常制御で前記圧縮機回転数を上昇させる場合の上昇速度よりも遅くされることを特徴とする空気調和機。 The air conditioner according to claim 1, wherein
In the rotation speed regulation control, when the current value detected by the current detection unit is less than the second reference current, the compressor rotation speed when the compressor rotation speed is increased to the target rotation speed is: An air conditioner characterized in that the speed is increased lower than the speed at which the compressor speed is increased in the normal control. 請求項１または２に記載の空気調和機であって、
前記基準電流算出部は、凝縮器雰囲気温度によって補正される前記第１基準電流および前記第２基準電流を求めることを特徴とする空気調和機。 The air conditioner according to claim 1 or 2,
The air conditioner, wherein the reference current calculation unit obtains the first reference current and the second reference current that are corrected based on a condenser ambient temperature. 圧縮機を含む冷凍サイクルを用いた空気調和機であって、
前記圧縮機における現在の電流値を検知する電流検知部と、
前記電流検知部で検知される電流値と圧縮機回転数とに基づく予測凝縮圧力を求める凝縮圧力算出部と、
前記圧縮機回転数を制御する回転数制御部とを備えており、
前記回転数制御部は、
前記圧縮機回転数が、室温と設定温度との温度差に応じて設定される目標回転数となるように制御する通常制御と、
凝縮圧力が許容ラインを超えないように、前記圧縮機回転数を制御する回転数規制制御とを行うものであり、
前記凝縮圧力算出部は、
前記電流検知部で検知される電流値と前記圧縮機の現在の回転数とに基づく第１予測凝縮圧力と、
前記電流検知部で検知される電流値と前記圧縮機の前記目標回転数とに基づく第２予測凝縮圧力とを求めるものであり、
前記回転数制御部は、前記回転数規制制御として、
前記第１予測凝縮圧力が第１基準凝縮圧力以上となったときに前記圧縮機回転数を下げる制御を行い、
前記第２予測凝縮圧力が前記第１基準凝縮圧力よりも小さい第２基準凝縮圧力未満となったときに前記圧縮機回転数を前記目標回転数にまで上げる制御を行うことを特徴とする空気調和機。 An air conditioner using a refrigeration cycle including a compressor,
A current detection unit that detects a current value of the compressor,
A condensing pressure calculating unit for calculating a predicted condensing pressure based on the current value and the compressor speed detected by the current detecting unit,
A rotation speed control unit for controlling the compressor rotation speed,
The rotation speed control unit,
Normal control for controlling the compressor speed to be a target speed set in accordance with a temperature difference between room temperature and a set temperature,
In order to prevent the condensing pressure from exceeding the allowable line, a rotational speed regulation control for controlling the compressor rotational speed is performed,
The condensation pressure calculator,
A first predicted condensing pressure based on a current value detected by the current detecting unit and a current rotational speed of the compressor;
Calculating a second predicted condensing pressure based on the current value detected by the current detection unit and the target rotation speed of the compressor;
The rotation speed control unit, as the rotation speed regulation control,
When the first predicted condensing pressure is equal to or higher than a first reference condensing pressure, control is performed to decrease the compressor speed,
When the second predicted condensing pressure is lower than a second reference condensing pressure that is lower than the first reference condensing pressure, control is performed to increase the compressor rotation speed to the target rotation speed. Machine. 請求項４に記載の空気調和機であって、
前記回転数規制制御において、前記第２予測凝縮圧力が前記第２基準凝縮圧力未満となり、前記圧縮機回転数を前記目標回転数にまで上げる場合の前記圧縮機回転数の上昇速度は、前記通常制御で前記圧縮機回転数を上昇させる場合の上昇速度よりも遅くされることを特徴とする空気調和機。 The air conditioner according to claim 4, wherein
In the rotation speed regulation control, the rising speed of the compressor rotation speed when the second predicted condensation pressure becomes less than the second reference condensation pressure and the compressor rotation speed is increased to the target rotation speed is the normal speed. An air conditioner characterized in that the speed is made slower than a rising speed when the compressor rotation speed is increased by control. 請求項４または５に記載の空気調和機であって、
前記凝縮圧力算出部は、凝縮器雰囲気温度によって補正される前記第１予測凝縮圧力および前記第２予測凝縮圧力を求めることを特徴とする空気調和機。 The air conditioner according to claim 4 or 5, wherein
The air conditioner, wherein the condensing pressure calculation unit calculates the first predicted condensing pressure and the second predicted condensing pressure that are corrected based on a condenser atmosphere temperature.
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