JP2016017729A - Air conditioner - Google Patents
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Abstract
Description
本発明は、空気調和機に関する。さらに詳しくは、本発明は、室外機と室内機とを接続する接続配管の長さによって余剰冷媒が変化する空気調和機に関する。 The present invention relates to an air conditioner. More specifically, the present invention relates to an air conditioner in which surplus refrigerant changes depending on the length of a connection pipe that connects the outdoor unit and the indoor unit.
設置現場における空気調和機の施工を迅速に行うため、予測される最大配管長分の冷媒をあらかじめ室外機に貯留しておき、設置現場において室外機と室内機とを接続配管で接続した後、室外機に貯留されている冷媒を接続配管等の配管中に解放することで施工時の冷媒封入作業を不要化した空気調和機がある。 In order to quickly install the air conditioner at the installation site, store the refrigerant for the predicted maximum pipe length in the outdoor unit in advance, and connect the outdoor unit and the indoor unit with a connection pipe at the installation site. There is an air conditioner that eliminates refrigerant filling work during construction by releasing refrigerant stored in an outdoor unit into a pipe such as a connection pipe.
このような空気調和機では、実際に室外機と室内機とを接続する接続配管の長さが最大配管長よりも短い場合には余剰冷媒が発生するが、この余剰冷媒をタンクに貯留することにより配管内の冷媒量を適正な範囲に制御して冷凍サイクル運転を実現している（例えば、特許文献１参照）。 In such an air conditioner, surplus refrigerant is generated when the length of the connecting pipe that actually connects the outdoor unit and the indoor unit is shorter than the maximum pipe length, but this surplus refrigerant is stored in the tank. Thus, the refrigerant quantity in the pipe is controlled within an appropriate range to realize the refrigeration cycle operation (see, for example, Patent Document 1).
しかしながら、近年、最大配管長の長尺化が求められ、あらかじめ封入される冷媒の量が多くなる傾向にある。その結果、接続配管の長さが設計範囲下限よりも短くなる施工（以下、「短配管施工」ともいう）においては、タンクに溜めきれない余剰冷媒により配管内が冷媒過多となり、始動時の圧縮機の著しい吐出圧力上昇により圧縮機保護装置が作動して緊急停止を引き起こすおそれがある。 However, in recent years, the maximum pipe length has been required to be increased, and the amount of refrigerant that is enclosed in advance tends to increase. As a result, in construction where the length of the connecting piping is shorter than the lower limit of the design range (hereinafter also referred to as “short piping construction”), the refrigerant in the piping becomes excessive due to excess refrigerant that cannot be stored in the tank, and compression at the start The compressor protection device may be activated due to a significant increase in discharge pressure of the machine, causing an emergency stop.
本発明は、以上のような事情に基づいてなされたものであり、その目的は、短配管施工であっても始動時に圧縮機の吐出圧力が著しく上昇することを抑制可能な空気調和機を提供することにある。 The present invention has been made based on the circumstances as described above, and an object thereof is to provide an air conditioner capable of suppressing a significant increase in the discharge pressure of the compressor at the start-up even in short piping construction. There is to do.
上記課題を解決するためになされた発明は、
室外熱交換器、周波数を制御可能な圧縮機、および冷媒を貯留可能なアキュムレータを有しあらかじめ冷媒が注入された室外機と、室内熱交換器を有する室内機とを接続配管で接続し、前記冷媒が前記接続配管を介して前記室外機と室内機との間を循環するように形成された空気調和機（以下、「チャージレス空気調和機」ともいう）において、前記接続配管が短配管であるか否かを判定する接続配管長判定手段と、前記接続配管長判定手段により前記接続配管が短配管であると判定された場合に、前記圧縮機の周波数を下げるように制御する周波数制御手段とを有することを特徴とする空気調和機である。
The invention made to solve the above problems is
An outdoor heat exchanger, a compressor capable of controlling the frequency, and an outdoor unit having an accumulator capable of storing the refrigerant and pre-injected with the refrigerant, and an indoor unit having the indoor heat exchanger connected by a connecting pipe, In an air conditioner (hereinafter also referred to as “chargeless air conditioner”) formed so that a refrigerant circulates between the outdoor unit and the indoor unit via the connection pipe, the connection pipe is a short pipe. A connection pipe length determination means for determining whether or not there is a frequency control means for controlling the frequency of the compressor to be lowered when the connection pipe length determination means determines that the connection pipe is a short pipe It is an air conditioner characterized by having.
なお、本明細書において、「短配管」とは、チャージレス空気調和機において、接続配管の長さが設計範囲下限よりも短い配管を意味する。 In the present specification, the “short pipe” means a pipe in which the length of the connection pipe is shorter than the lower limit of the design range in the chargeless air conditioner.
本発明は、短配管施工であっても、始動時に圧縮機の吐出圧力が著しく上昇することを防止可能な空気調和機を提供することができる。 The present invention can provide an air conditioner that can prevent the discharge pressure of the compressor from significantly increasing during start-up even in the case of short pipe construction.
本発明の空気調和機は、室外熱交換器、周波数を制御可能な圧縮機、および冷媒を貯留可能なアキュムレータを有しあらかじめ冷媒が注入された室外機と、室内熱交換器を有する室内機とを接続配管で接続し、上記冷媒が上記接続配管を介して上記室外機と室内機との間を循環するように形成された空気調和機において、上記接続配管が短配管であるか否かを判定する接続配管長判定手段と、上記接続配管長判定手段により上記接続配管が短配管であると判定された場合に、上記圧縮機の周波数を下げるように制御する周波数制御手段とを有することを特徴とする。 The air conditioner of the present invention includes an outdoor heat exchanger, a compressor capable of controlling the frequency, an outdoor unit having an accumulator capable of storing the refrigerant and pre-injected with the refrigerant, and an indoor unit having the indoor heat exchanger. In the air conditioner formed so that the refrigerant circulates between the outdoor unit and the indoor unit through the connection pipe, whether or not the connection pipe is a short pipe. A connecting pipe length determining means for determining, and a frequency control means for controlling to reduce the frequency of the compressor when the connecting pipe length determining means determines that the connecting pipe is a short pipe. Features.
以下、本発明の空気調和機の一実施形態について図を参照して説明する。図１は、本発明の空気調和機の構成を示す模式図である。 Hereinafter, an embodiment of an air conditioner of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of the air conditioner of the present invention.
図１に示すように、本発明の空気調和機１は、室外機１０と室内機２０とを備え、これら室外機１０および室内機２０は、接続配管３０で接続されている。 As shown in FIG. 1, the air conditioner 1 of the present invention includes an outdoor unit 10 and an indoor unit 20, and the outdoor unit 10 and the indoor unit 20 are connected by a connection pipe 30.
室外機１０は、圧縮機１１と、四方弁１２と、室外熱交換器１３と、室外膨張弁１４と、アキュムレータ１５とを備え、これらは室外冷媒配管１６により接続されている。さらに、室外機１０は、圧力センサ１７および制御器１８を備えている。 The outdoor unit 10 includes a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, an outdoor expansion valve 14, and an accumulator 15, which are connected by an outdoor refrigerant pipe 16. Further, the outdoor unit 10 includes a pressure sensor 17 and a controller 18.
圧縮機１１は、周波数を制御可能であり、これにより圧縮能力を調整しながら低温低圧ガスの冷媒を高温高圧ガスに圧縮して吐出する。四方弁１２は、冷媒の流れを切り替える弁である。室外熱交換器１３は、屋外の空気と冷媒との間で熱交換を行う。室外膨張弁１４は、暖房運転時に冷媒を減圧して低温にする。アキュムレータ１５は、施工時に発生する余剰冷媒を貯留する。 The compressor 11 can control the frequency, and thereby compresses the refrigerant of the low-temperature and low-pressure gas into the high-temperature and high-pressure gas while adjusting the compression capacity, and discharges it. The four-way valve 12 is a valve that switches a refrigerant flow. The outdoor heat exchanger 13 performs heat exchange between outdoor air and the refrigerant. The outdoor expansion valve 14 depressurizes the refrigerant to lower the temperature during heating operation. The accumulator 15 stores surplus refrigerant generated during construction.
圧力センサ１７は、圧縮機１１の吐出側の冷媒の圧力（吐出圧力Ｐ）を測定する。制御器１８は、マイコン１８１、記憶部１８２（例えばＲＯＭなど）および圧縮機保護部１８３を有する。 The pressure sensor 17 measures the pressure of the refrigerant on the discharge side of the compressor 11 (discharge pressure P). The controller 18 includes a microcomputer 181, a storage unit 182 (such as a ROM) and a compressor protection unit 183.
マイコン１８１は、リモートコントローラ（不図示）における設定および各センサにより検知された値に基づき各種データの演算を行い、空気調和機１の運転制御を行う。さらに、マイコン１８１は、接続配管長判定手段２０１および周波数制御手段２０２を有している。圧縮機保護部１８３は、圧力センサ１７で測定した吐出圧力が運転適正圧力範囲の上限を超え、保護圧力に達すると圧縮機１１を緊急停止させる。なお、運転適正圧力範囲は、圧縮機１１が継続して安定的に動作可能な吐出圧力の範囲を意味する。 The microcomputer 181 calculates various data based on settings in a remote controller (not shown) and values detected by the sensors, and controls the operation of the air conditioner 1. Further, the microcomputer 181 includes a connection pipe length determination unit 201 and a frequency control unit 202. The compressor protection unit 183 causes the compressor 11 to stop urgently when the discharge pressure measured by the pressure sensor 17 exceeds the upper limit of the proper operating pressure range and reaches the protection pressure. The proper operating pressure range means a range of discharge pressure at which the compressor 11 can continuously operate stably.
室内機２０は、室内熱交換器２１と、室内膨張弁２２とを備え、これらは室内冷媒配管２３により接続されている。さらに、室内機２０は、表示手段２４を備えている。 The indoor unit 20 includes an indoor heat exchanger 21 and an indoor expansion valve 22, which are connected by an indoor refrigerant pipe 23. Furthermore, the indoor unit 20 includes a display unit 24.
室内熱交換器２１は、室内の空気と冷媒との間で熱交換を行う。室内膨張弁２２は、冷房運転時に冷媒を減圧して低温にする。 The indoor heat exchanger 21 performs heat exchange between the indoor air and the refrigerant. The indoor expansion valve 22 reduces the refrigerant pressure to a low temperature during the cooling operation.
表示手段２４は、接続配管長判定手段２０１により接続配管３０が短配管であると判定された場合に、上記判定の結果を表示する。表示手段２４の表示方法としては、特に限定されないが、例えば、ＬＥＤを設けて点灯させる方法、ディスプレイを設けて短配管である旨を表示させる方法等が挙げられる。当該空気調和機１が表示手段２４を備えていることで、接続配管３０が短配管であるか否かを容易かつ確実に認識することができ、施工後におけるメンテナンス性を向上させることができる。 The display unit 24 displays the determination result when the connection pipe length determination unit 201 determines that the connection pipe 30 is a short pipe. The display method of the display means 24 is not particularly limited, and examples thereof include a method of lighting an LED and a method of displaying a short pipe by providing a display. By providing the air conditioner 1 with the display means 24, it is possible to easily and reliably recognize whether the connection pipe 30 is a short pipe, and to improve the maintainability after construction.
空気調和機１の施工の際、室外機１０と室内機２０とが接続配管３０で接続され、冷媒が接続配管３０を介して室外機１０と室内機２０との間を循環するように形成される。 When constructing the air conditioner 1, the outdoor unit 10 and the indoor unit 20 are connected by the connection pipe 30, and the refrigerant is formed to circulate between the outdoor unit 10 and the indoor unit 20 through the connection pipe 30. The
次に、空気調和機１の動作時の冷媒の流れについて説明する。図１中の実線の矢印は、冷房運転時の冷媒の流れ方向を示している。 Next, the flow of the refrigerant during the operation of the air conditioner 1 will be described. The solid arrows in FIG. 1 indicate the flow direction of the refrigerant during the cooling operation.
冷房運転において、四方弁１２は、実線で示すように、圧縮機１１の吐出側と室外熱交換器１３とを連通させる。圧縮機１１から吐出される高温高圧のガス冷媒は、四方弁１２を通過し、室外熱交換器１３側に流れる。室外熱交換器１３に流入したガス冷媒は、図示していない室外ファンにより供給される外気と熱交換（放熱）して凝縮され、液冷媒となる。この液冷媒は、全開状態の室外膨張弁１４および室外冷媒配管１６を通過し、接続配管３０を介して室内機２０に流入する。室内機２０に流入した液冷媒は、室内膨張弁２２により減圧されて、低温低圧のガス液混合冷媒となる。この低温低圧のガス液混合媒は、室内熱交換器２１に流入して、図示していない室内ファンにより供給される室内の空気と熱交換（吸熱）して蒸発し、ガス冷媒となる。この際、室内の空気は、ガス液混合冷媒中の一部の液冷媒の蒸発潜熱により冷却され、冷風が部屋内に送られる。その後、ガス液混合冷媒は、室内冷媒配管２３を通過し、接続配管３０を介して室外機１０に戻される。室外機１０に戻されたガス液混合冷媒は、四方弁１２を通過し、アキュムレータ１５にて冷媒中の液冷媒が分離され、ガス冷媒のみ圧縮機１１に吸入されて再度圧縮機１１で圧縮される。これにより一連の冷凍サイクルが形成される。 In the cooling operation, the four-way valve 12 causes the discharge side of the compressor 11 and the outdoor heat exchanger 13 to communicate with each other as indicated by a solid line. The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 passes through the four-way valve 12 and flows to the outdoor heat exchanger 13 side. The gas refrigerant that has flowed into the outdoor heat exchanger 13 is condensed by exchanging heat (dissipating heat) with outside air supplied by an outdoor fan (not shown) to become a liquid refrigerant. The liquid refrigerant passes through the fully-expanded outdoor expansion valve 14 and the outdoor refrigerant pipe 16 and flows into the indoor unit 20 through the connection pipe 30. The liquid refrigerant flowing into the indoor unit 20 is decompressed by the indoor expansion valve 22 and becomes a low-temperature and low-pressure gas-liquid mixed refrigerant. This low-temperature and low-pressure gas-liquid mixed medium flows into the indoor heat exchanger 21 and evaporates by exchanging heat (absorbing heat) with indoor air supplied by an indoor fan (not shown) to become a gas refrigerant. At this time, the indoor air is cooled by the latent heat of vaporization of a part of the liquid refrigerant in the gas-liquid mixed refrigerant, and cool air is sent into the room. Thereafter, the gas-liquid mixed refrigerant passes through the indoor refrigerant pipe 23 and is returned to the outdoor unit 10 through the connection pipe 30. The gas-liquid mixed refrigerant returned to the outdoor unit 10 passes through the four-way valve 12, the liquid refrigerant in the refrigerant is separated by the accumulator 15, only the gas refrigerant is sucked into the compressor 11, and compressed again by the compressor 11. The This forms a series of refrigeration cycles.
一方、図１中の破線の矢印は、暖房運転時の冷媒の流れ方向を示している。なお、暖房運転と上述した冷房運転とは、四方弁１２を操作することで切り替えることができる。 On the other hand, the dashed arrows in FIG. 1 indicate the flow direction of the refrigerant during the heating operation. The heating operation and the cooling operation described above can be switched by operating the four-way valve 12.
暖房運転において、四方弁１２は、破線で示すように、圧縮機１１の吐出側と室内熱交換器２１とを連通させる。圧縮機１１から吐出される高温高圧のガス冷媒は、四方弁１２を通過し、室内熱交換器２１側に流れる。室内熱交換器２１に流入したガス冷媒は、図示していない室内ファンにより供給される空気と熱交換（放熱）して凝縮され、液冷媒となる。この際、室内の空気は、ガス液混合冷媒の凝縮潜熱により加温され、温風が部屋内に送られる。その後、液冷媒は、全開状態の室内膨張弁２２および室内冷媒配管２３を通過し、接続配管３０を介して室外機１０に流入する。室外機１０に流入した液冷媒は、室外膨張弁１４により減圧されて、低温低圧のガス液混合冷媒となる。この低温低圧のガス液混合媒は、室外熱交換器１３に流入して、図示していない室外ファンにより供給される外気と熱交換（吸熱）して一部が蒸発する。その後、室外熱交換器１３から流出したガス液混合冷媒は、四方弁１２を通過し、アキュムレータ１５にて冷媒中の液冷媒が分離され、ガス冷媒のみ圧縮機１１に吸入されて再度圧縮機１１で圧縮される。これにより一連の冷凍サイクルが形成される。 In the heating operation, the four-way valve 12 causes the discharge side of the compressor 11 and the indoor heat exchanger 21 to communicate with each other as indicated by a broken line. The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 passes through the four-way valve 12 and flows to the indoor heat exchanger 21 side. The gas refrigerant flowing into the indoor heat exchanger 21 is condensed by exchanging heat (dissipating heat) with air supplied by an indoor fan (not shown) to become a liquid refrigerant. At this time, the indoor air is heated by the condensation latent heat of the gas-liquid mixed refrigerant, and the warm air is sent into the room. Thereafter, the liquid refrigerant passes through the indoor expansion valve 22 and the indoor refrigerant pipe 23 which are fully opened, and flows into the outdoor unit 10 through the connection pipe 30. The liquid refrigerant flowing into the outdoor unit 10 is decompressed by the outdoor expansion valve 14 and becomes a low-temperature and low-pressure gas-liquid mixed refrigerant. This low-temperature and low-pressure gas-liquid mixed medium flows into the outdoor heat exchanger 13, and partly evaporates due to heat exchange (heat absorption) with outside air supplied by an outdoor fan (not shown). Thereafter, the gas-liquid mixed refrigerant that has flowed out of the outdoor heat exchanger 13 passes through the four-way valve 12, and the liquid refrigerant in the refrigerant is separated by the accumulator 15, and only the gas refrigerant is sucked into the compressor 11 and again the compressor 11. It is compressed with. This forms a series of refrigeration cycles.
なお、接続配管３０の長さが設計範囲内（短配管施工ではない場合）であれば、余剰冷媒の全てをアキュムレータ１５に貯留し、配管内の冷媒量を適正な範囲に維持することができる。 If the length of the connecting pipe 30 is within the design range (in the case of short pipe construction), all of the excess refrigerant can be stored in the accumulator 15 and the refrigerant amount in the pipe can be maintained in an appropriate range. .
接続配管長判定手段２０１は、接続配管３０が短配管であるか否かを判定する。接続配管長判定手段２０１としては特に限定されないが、圧縮機始動時から所定時間経過後の吐出圧力が設定値以上となった場合に短配管であると判定する手段（以下、「第１の判定手段」ともいう）および圧縮機始動後の吐出圧力の上昇速度が設定値以上となった場合に短配管であると判定する手段（以下、「第２の判定手段」ともいう）が好ましい。 The connection pipe length determination unit 201 determines whether or not the connection pipe 30 is a short pipe. The connection pipe length determination means 201 is not particularly limited, but is a means for determining that the pipe is a short pipe when the discharge pressure after a predetermined time has elapsed from the time of starting the compressor exceeds a set value (hereinafter referred to as “first determination”). And a means for determining that the pipe is a short pipe when the rate of increase in the discharge pressure after starting the compressor exceeds a set value (hereinafter also referred to as “second determination means”) is preferable.
図２および図３は、接続配管長判定手段により短配管であるか否かの判定を行う例を示す概略図であり、図２および図３は、それぞれ第１および第２の判定手段を用いた判定方法を示している。 2 and 3 are schematic diagrams showing an example in which it is determined whether or not the pipe is a short pipe by the connecting pipe length determining means. FIGS. 2 and 3 use the first and second determining means, respectively. Shows the judgment method.
第１の判定手段では、例えば図２に示すように、圧縮機始動時から所定時間（Ｔ１）経過後の吐出圧力Ｐが設定値（Ｐａ）以上となった場合に短配管であると判定する。ここで、Ｔ１は、吐出圧力Ｐが過渡状態にあるときの特定の時間を意味する。上記Ｔ１およびＰａは、空気調和機１の運転条件（例えば、室内空調設定温度、室内設定風量、室外温度など、以下同じ）により適宜選択される。 In the first determination means, for example, as shown in FIG. 2, it is determined that the pipe is a short pipe when the discharge pressure P after a predetermined time (T 1 ) elapses from the time of starting the compressor becomes a set value (Pa) or more. To do. Here, T 1 means a specific time when the discharge pressure P is in a transient state. T 1 and Pa are appropriately selected according to the operating conditions of the air conditioner 1 (for example, indoor air conditioning set temperature, indoor set air volume, outdoor temperature, and so on).
例えば、接続配管３０の長さが設計範囲内の場合、図２に一点鎖線で示すように、圧縮機１１始動時からＴ１経過後の吐出圧力ＰがＰａよりも低くなるため、接続配管長判定手段２０１により接続配管３０が短配管であると判定されない。一方、接続配管３０が短配管の場合、図２に実線または破線で示すように、圧縮機１１始動時からＴ１経過後の吐出圧力Ｐ（Ｐ１）がＰａ以上となり、接続配管長判定手段２０１により接続配管３０が短配管であると判定される。 For example, if in the long design range of the connection pipe 30, as indicated by one-dot chain lines in FIG. 2, since the discharge pressure P after T 1 elapses from the compressor 11 during starting is lower than the Pa, connecting pipe length The determination unit 201 does not determine that the connection pipe 30 is a short pipe. On the other hand, when the connection pipe 30 is a short pipe, as shown by a solid line or a broken line in FIG. 2, the discharge pressure P (P 1 ) after T 1 has elapsed since the start of the compressor 11 becomes Pa or more, and the connection pipe length determination means 201 determines that the connection pipe 30 is a short pipe.
第２の判定手段では、圧縮機始動後の吐出圧力Ｐの上昇速度Ｐｓが設定値（Ｐｓａ）以上となった場合に短配管であると判定する。具体的には、上昇速度Ｐｓは、下記式（１）で算出される速度または特定時間経過時の瞬間速度のいずれであってもよい。
Ｐｓ＝（Ｐ３−Ｐ２）／（Ｔ３−Ｔ２）・・・（１）
上記式（１）中、Ｔ２およびＴ３は、それぞれ吐出圧力が過渡状態における圧縮機１１始動時からの経過時間を意味し、Ｐ２およびＰ３は、それぞれＴ２およびＴ３における吐出圧力Ｐを意味する。ただし、Ｔ２≠Ｔ３である。上記Ｔ２、Ｔ３およびＰｓａは、空気調和機１の運転条件により適宜選択される。
The second determination means determines that the pipe is a short pipe when the rate of increase Ps of the discharge pressure P after the compressor starts becomes equal to or higher than a set value (Psa). Specifically, the rising speed Ps may be either the speed calculated by the following formula (1) or the instantaneous speed when a specific time has elapsed.
Ps = (P 3 -P 2) / (T 3 -T 2) ··· (1)
In the above formula (1), T 2 and T 3 mean the elapsed time from the start of the compressor 11 when the discharge pressure is in a transient state, and P 2 and P 3 are the discharge pressure at T 2 and T 3 , respectively. P is meant. However, T 2 ≠ T 3 . T 2 , T 3 and Psa are appropriately selected depending on the operating conditions of the air conditioner 1.
例えば、接続配管３０の長さが設計範囲内である場合、図３に一点鎖線で示すように、Ｔ２からＴ３の上昇速度Ｐｓは比較的小さい（勾配が小）のに対し、接続配管３０が短配管である場合、図３に実線および破線で示すように、Ｔ２からＴ３の上昇速度Ｐｓは、接続配管３０の長さが設計範囲内である場合よりも大きく（勾配が大）なる。したがって、これらの上昇速度Ｐｓの間にＰｓａが選択されていれば、その大小関係から接続配管３０が短配管であるか否かを判定することができる。 For example, when the length of the connection pipe 30 is within the design range, the rising speed Ps from T 2 to T 3 is relatively small (gradient is small), as shown by a one-dot chain line in FIG. When 30 is a short pipe, as shown by a solid line and a broken line in FIG. 3, the rising speed Ps from T 2 to T 3 is larger than when the length of the connection pipe 30 is within the design range (the gradient is large). )Become. Therefore, if Psa is selected between these ascending speeds Ps, it can be determined from the magnitude relationship whether the connection pipe 30 is a short pipe.
上述したＴ１、Ｔ２およびＴ３、並びに設定値ＰａおよびＰｓａは、設定温度等の空気調和機１の運転条件ごとに異なるため、それぞれの運転条件に対応した値をデータテーブルとして制御器１８の記憶部１８２にあらかじめ記憶させておくことで、運転条件に見合った値を即時に選択することができる。 The above-described T 1 , T 2 and T 3 , and set values Pa and Psa differ depending on the operating conditions of the air conditioner 1 such as the set temperature, and therefore the controller 18 uses values corresponding to the respective operating conditions as a data table. By storing in advance in the storage unit 182, it is possible to immediately select a value corresponding to the operating condition.
周波数制御手段２０２は、接続配管長判定手段２０１により接続配管３０が短配管であると判定された場合に、圧縮機１１の周波数を下げるように制御する。これにより圧縮機１１の圧縮能力が抑制され、図２および図３に実線で示すように、圧縮機１１の吐出圧力の上昇速度を抑えて安定時の吐出圧力Ｐを運転適正圧力範囲の上限Ｐｂ内に収めることができる。周波数制御手段２０２としては、例えば、圧縮機１１の駆動に交流モータ（不図示）を用い、インバータ制御により周波数を下げて交流モータの回転速度を遅くし、圧縮能力を抑制する手段等が挙げられる。 The frequency control unit 202 controls the frequency of the compressor 11 to be lowered when the connection pipe length determination unit 201 determines that the connection pipe 30 is a short pipe. As a result, the compression capacity of the compressor 11 is suppressed, and as shown by the solid lines in FIGS. 2 and 3, the discharge pressure P at the stable time is suppressed by suppressing the increase rate of the discharge pressure of the compressor 11, and the upper limit Pb of the proper operating pressure range. Can fit inside. Examples of the frequency control unit 202 include a unit that uses an AC motor (not shown) to drive the compressor 11 and lowers the frequency by inverter control to reduce the rotational speed of the AC motor, thereby suppressing the compression capability. .
なお、接続配管長判定手段２０１および周波数制御手段２０２を備えていない空気調和機では、接続配管３０が短配管である場合、図２および図３に破線で示すように、吐出圧力Ｐは、時間の経過と共に上昇し、運転適正圧力範囲の上限Ｐｂを超える。そして保護圧力Ｐｃに達すると圧縮機保護部１８３の作動により圧縮機１１が緊急停止し、強制的な吐出圧力Ｐの低下と共に空気調和機能が停止する。なお、その後に吐出圧力が運転適正圧力範囲となって圧縮機１１が再稼働したとしても、再度の吐出圧力の上昇により緊急停止を繰り返すため、安定的な空気調和が阻害されてユーザの快適性を損ねるおそれがある。 Note that in an air conditioner that does not include the connection pipe length determination unit 201 and the frequency control unit 202, when the connection pipe 30 is a short pipe, the discharge pressure P is the time as shown by the broken line in FIGS. Rises over time and exceeds the upper limit Pb of the proper operating pressure range. When the protection pressure Pc is reached, the compressor 11 is urgently stopped by the operation of the compressor protection unit 183, and the air conditioning function is stopped as the discharge pressure P is forcibly reduced. In addition, even if the discharge pressure subsequently becomes within the proper operating pressure range and the compressor 11 is restarted, the emergency stop is repeated due to the increase of the discharge pressure again, so that stable air conditioning is hindered and user comfort is improved. May be damaged.
短配管であるか否かの判定に用いる圧縮機１１の吐出圧力Ｐは、室外熱交換器１３および室内熱交換器２１のうちの凝縮器として働く一方の冷媒の液温から推定される圧力であってもよい。これにより、簡便に圧縮機１１の吐出圧力を求めることができる。なお、冷房運転時には室外熱交換器１３が凝縮器として働き、暖房運転時には室内熱交換器２１が凝縮器として働く。かかる場合、圧力センサ１７に代えて、冷媒の液温を測定するための液温センサ（不図示）が凝縮器に備えられる。 The discharge pressure P of the compressor 11 used for determining whether or not the pipe is a short pipe is a pressure estimated from the liquid temperature of one of the refrigerants acting as a condenser of the outdoor heat exchanger 13 and the indoor heat exchanger 21. There may be. Thereby, the discharge pressure of the compressor 11 can be calculated | required simply. The outdoor heat exchanger 13 functions as a condenser during the cooling operation, and the indoor heat exchanger 21 functions as a condenser during the heating operation. In such a case, instead of the pressure sensor 17, a liquid temperature sensor (not shown) for measuring the liquid temperature of the refrigerant is provided in the condenser.
このように、空気調和機１は、接続配管３０が短配管であるか否かを判定する接続配管長判定手段２０１と、接続配管長判定手段２０１により接続配管３０が短配管であると判定された場合に、圧縮機１１の周波数を下げるように制御する周波数制御手段２０２とを有するので、接続配管３０が短配管であっても、圧縮機１１の圧縮能力を抑制することができ、始動時に圧縮機１１の吐出圧力が著しく上昇することを防止することができる。 Thus, the air conditioner 1 determines that the connection pipe 30 is a short pipe by the connection pipe length determination means 201 that determines whether or not the connection pipe 30 is a short pipe. If the connecting pipe 30 is a short pipe, the compression capacity of the compressor 11 can be suppressed even when the connection pipe 30 is a short pipe. It is possible to prevent the discharge pressure of the compressor 11 from significantly increasing.
なお、本発明は、上述した実施形態の構成に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内での全ての変更が含まれることが意図される。 In addition, this invention is not limited to the structure of embodiment mentioned above, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included. Is done.
例えば、上述した実施形態では、吐出圧力Ｐを求めるために圧力センサ１７または液温センサのいずれかを備えている空気調和機１について説明したが、圧力センサ１７および液温センサの両者を備え、これら両センサから得られた吐出圧力Ｐの情報を利用するようにしてもよい。 For example, in the above-described embodiment, the air conditioner 1 including either the pressure sensor 17 or the liquid temperature sensor in order to obtain the discharge pressure P has been described, but both the pressure sensor 17 and the liquid temperature sensor are provided. You may make it utilize the information of the discharge pressure P obtained from these both sensors.
１ 空気調和機
１０ 室外機
１１ 圧縮機
１２ 四方弁
１３ 室外熱交換器
１５ アキュムレータ
１７ 圧力センサ
１８ 制御器
２０ 室内機
２１ 室内熱交換器
２４ 表示手段
３０ 接続配管
DESCRIPTION OF SYMBOLS 1 Air conditioner 10 Outdoor unit 11 Compressor 12 Four-way valve 13 Outdoor heat exchanger 15 Accumulator 17 Pressure sensor 18 Controller 20 Indoor unit 21 Indoor heat exchanger 24 Display means 30 Connection piping
Claims (4)
前記接続配管が短配管であるか否かを判定する接続配管長判定手段と、
前記接続配管長判定手段により前記接続配管が短配管であると判定された場合に、前記圧縮機の周波数を下げるように制御する周波数制御手段とを有することを特徴とする空気調和機。 An outdoor heat exchanger, a compressor capable of controlling the frequency, and an outdoor unit having an accumulator capable of storing the refrigerant and pre-injected with the refrigerant, and an indoor unit having the indoor heat exchanger connected by a connecting pipe, In the air conditioner formed so that the refrigerant circulates between the outdoor unit and the indoor unit through the connection pipe,
Connection pipe length determination means for determining whether or not the connection pipe is a short pipe;
An air conditioner comprising: frequency control means for controlling to reduce the frequency of the compressor when the connection pipe length determination means determines that the connection pipe is a short pipe.
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| CN115264928A (en) * | 2022-08-30 | 2022-11-01 | 宁波奥克斯电气股份有限公司 | Frequency regulation and control method and device and air conditioner |
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| CN115342489A (en) * | 2022-08-30 | 2022-11-15 | 宁波奥克斯电气股份有限公司 | Air conditioner frequency control method, device and air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115342489B (en) * | 2022-08-30 | 2024-06-11 | 宁波奥克斯电气股份有限公司 | Air conditioner frequency control method and device and air conditioner |
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