JP2009204168A - Compressor protecting controlling device for air conditioner - Google Patents

Compressor protecting controlling device for air conditioner Download PDF

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JP2009204168A
JP2009204168A JP2008044204A JP2008044204A JP2009204168A JP 2009204168 A JP2009204168 A JP 2009204168A JP 2008044204 A JP2008044204 A JP 2008044204A JP 2008044204 A JP2008044204 A JP 2008044204A JP 2009204168 A JP2009204168 A JP 2009204168A
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temperature
compressor
predetermined set
suction
detecting means
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Masaya Ota
雅也 太田
Koji Maekawa
宏司 前川
Hiroyuki Daimon
寛幸 大門
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Panasonic Corp
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Panasonic Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor protecting controlling device for an air conditioner for keeping a stable heating operation state under an extremely-low outside air temperature. <P>SOLUTION: In this compressor protecting controlling device 20 comprising an outdoor piping temperature detecting means 6 detecting a refrigerant inlet-side piping temperature of an evaporator (not shown in the figure) in a heating operation, a compressor operational frequency control means 22 controlling an operational frequency of the compressor (not shown in the figure), and a piping temperature comparing detecting means 21 detecting and outputting that the piping temperature is lower than a first prescribed set temperature, when the piping temperature becomes lower than the first prescribed set temperature and higher than a second prescribed set temperature, and lowering the maximum compressor operational frequency when a boundary value lowering signal A is output by the piping temperature comparing detecting means 21, the first and second prescribed set temperatures are corrected according to the difference between a suction temperature and the piping temperature at the suction-side piping of the compressor, thus abnormal lowering of a suction pressure is prevented, and the stable heating operation state is kept. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、空気調和機の圧縮機保護制御装置に関するもので、特に、暖房運転安定時において極低外気温度条件に設置された空気調和機の冷凍装置の圧縮機を使用可能圧力範囲から外れないよう保護しながら運転制御する空気調和機の圧縮機保護制御に関するものである。   The present invention relates to a compressor protection control device for an air conditioner, and in particular, the compressor of an air conditioner refrigeration apparatus installed at extremely low outside air temperature conditions when the heating operation is stable does not deviate from the usable pressure range. It is related with the compressor protection control of the air conditioner which carries out operation control while protecting.

近年、市場では、暖房能力アップによりエアコン暖房の認知度が上がり、寒冷地の普及率が増加傾向にあり、極低外気温度条件に設置された空気調和機の圧縮機の信頼性向上が重視されてきている。   In recent years, the awareness of air conditioning heating has increased in the market due to increased heating capacity, and the prevalence of cold districts has been increasing, and emphasis has been placed on improving the reliability of compressors for air conditioners installed in extremely low outside air temperature conditions. It is coming.

極低外気温度条件に設置された空気調和機の冷凍サイクル装置の圧縮機にて暖房運転された場合、極低温な外気温度や着霜状態により、予め決められた圧縮比上限を超えてしまう恐れがあり、圧縮機メカ部に入ってくるオイル供給量が希釈されて減少し、十分な潤滑機能が得られなくなり、圧縮機の信頼性が悪化してしまうこととなるが、一般に、冷凍サイクル装置には、圧縮機が予め決められた使用条件以外の条件下で運転されないよう保護制御を設けたものがある。   When heating operation is performed with a compressor of a refrigerating cycle device of an air conditioner installed in extremely low outside air temperature conditions, there is a risk of exceeding a predetermined compression ratio upper limit due to extremely cold outside air temperature or frost formation. In general, the amount of oil supplied to the compressor mechanism is diluted and decreased, and a sufficient lubrication function cannot be obtained, so that the reliability of the compressor deteriorates. In some cases, protection control is provided so that the compressor is not operated under conditions other than predetermined use conditions.

この保護制御は、例えば圧縮機の使用可能範囲外まで冷媒が過度に高圧な場合には、高圧保護遮断装置を、圧縮機の使用可能範囲外まで冷媒が過度に低圧な場合には低圧保護遮断装置をそれぞれ動作させ、圧縮機を停止し、運転状態を予め決められた範囲内に制限することで圧縮機を保護するようにしている(例えば、特許文献1参照)。   For example, when the refrigerant is excessively high pressure outside the usable range of the compressor, the protection control is performed by using a high-pressure protective cutoff device. When the refrigerant is excessively low pressure outside the compressor usable range, the low-pressure protective cutoff is performed. Each of the devices is operated, the compressor is stopped, and the compressor is protected by limiting the operating state to a predetermined range (see, for example, Patent Document 1).

図6は、上記特許文献1に記載された従来の空気調和機の圧縮機保護制御装置を搭載した冷凍サイクル装置の構成図である。   FIG. 6 is a configuration diagram of a refrigeration cycle apparatus equipped with a conventional compressor protection control device for an air conditioner described in Patent Document 1.

同図に示すように、従来の冷凍サイクル装置は、圧縮機1と、凝縮器5と、受液器15と、減圧器4と、蒸発器3とを冷媒回路で連結して構成され、圧縮機1の吸入側には圧力が予め決められた設定圧力以下に下がると開く低圧保護遮断装置13と、予め決められた設定圧力以下に下がると閉じる低圧保護遮断装置14が設けられている。また、圧縮機1の吐出配管と吸入配管とを結ぶバイパス配管12の途中に電磁弁11を設け、弁開度調整制御により圧縮機1吸入側に吐出ガスを導くことで、吸入圧力を一定以上に保ち、設定圧力以上に吸入圧力が確保できた時点で、電磁弁11を閉じ、吐出ガスのバイパスを終了させることにより通常の冷凍サイクルに戻すことができるようになっている。
特開平4−124558号公報
As shown in the figure, the conventional refrigeration cycle apparatus is configured by connecting a compressor 1, a condenser 5, a liquid receiver 15, a decompressor 4, and an evaporator 3 with a refrigerant circuit, and compressing the compressor. On the suction side of the machine 1, there are provided a low-pressure protection cutoff device 13 that opens when the pressure drops below a predetermined set pressure and a low-pressure protection cutoff device 14 that closes when the pressure drops below a predetermined set pressure. Further, an electromagnetic valve 11 is provided in the middle of the bypass pipe 12 connecting the discharge pipe and the suction pipe of the compressor 1 and the discharge pressure is guided to the compressor 1 suction side by the valve opening adjustment control, so that the suction pressure is more than a certain level. When the suction pressure is secured above the set pressure, the solenoid valve 11 is closed and the bypass of the discharge gas is terminated to return to the normal refrigeration cycle.
JP-A-4-124558

しかしながら、このような従来の空気調和機の圧縮機保護制御装置の圧縮機保護方式では、次のような課題が発生する。   However, in the compressor protection system of the conventional compressor protection control device for an air conditioner, the following problems occur.

この圧縮機保護方式では、極低外気温度条件に設置された場合の運転状態について考慮されておらず、上記条件で高周波数にて暖房運転された冷凍サイクル装置における圧縮比は非常に高く、かつ吸入圧力は、外気温度によって圧縮機の使用可能圧力範囲から外れて予め決められた設定圧力以下に下がりやすく、常に弁開度調整制御により圧縮機1の吸入側に吐出ガスを導き、吸入圧力を上げることとなり、また設定圧力以上に吸入圧力を確保し吐出ガスのバイパスを終了させても、極低外気温度条件に設置されているので、すぐ再
び予め決められた設定圧力以下に下がりやすくなり、吐出ガスをバイパスさせる冷凍サイクルと通常の冷凍サイクルを繰り返すという課題を有していた。
In this compressor protection system, the operating state when installed in extremely low outside air temperature conditions is not considered, the compression ratio in the refrigeration cycle apparatus that is heated at high frequency under the above conditions is very high, and The suction pressure is likely to fall outside the usable pressure range of the compressor due to the outside air temperature and easily fall below a predetermined set pressure, and the discharge gas is always guided to the suction side of the compressor 1 by the valve opening adjustment control, and the suction pressure is reduced. Even if the intake pressure is secured above the set pressure and the bypass of the discharge gas is terminated, it is easily set to fall below the preset set pressure immediately because it is installed at extremely low outside air temperature conditions. It had the subject of repeating the refrigerating cycle which bypasses discharge gas, and a normal refrigerating cycle.

また、バイパス配管12を新たに追加する必要が生じるとともに、配管からのガスリーク等が生じ易くなるなどの基本的課題もあった。   In addition, it is necessary to newly add a bypass pipe 12, and there are also basic problems such as easy gas leakage from the pipe.

また、吸入圧力が予め決められた設定圧力以下に下がると、低圧保護遮断装置13が開き圧縮機1の運転を停止させ、吸入圧力が予め決められた設定圧力以上になり低圧保護遮断装置14が開くことにより圧縮機1を運転開始する2つの低圧保護遮断装置のみによって十分な低圧保護を行うことは困難であり、吸入圧力を一定値以下に下げない手段として電動式膨張弁の弁開度を制御することによって吸入圧力を制御しているが、制御回路の限時継電器による設定時間電磁弁を開弁する制御が複雑でありマイコン制御が必要となり、コスト的にも高価なものであった。   Further, when the suction pressure falls below a predetermined set pressure, the low pressure protection cutoff device 13 opens and stops the operation of the compressor 1, and the suction pressure becomes equal to or higher than the preset set pressure, so that the low pressure protection cutoff device 14 It is difficult to perform sufficient low-pressure protection only with the two low-pressure protection shut-off devices that start operation of the compressor 1 by opening the valve, and the opening degree of the electric expansion valve is set as a means for preventing the suction pressure from being lowered below a certain value. Although the suction pressure is controlled by controlling, the control for opening the solenoid valve for a set time by the time-delay relay of the control circuit is complicated and requires microcomputer control, which is expensive in terms of cost.

本発明は、上記従来の課題を解決するもので、極低外気温度条件に設置された空気調和機の冷凍サイクル装置の圧縮機において、吸入圧力を一定以上に保つことができ、かつ安定した暖房運転を提供すると共に、十分な低圧保護が可能な冷凍サイクルを提供し、かつ信頼性の高い空気調和機の圧縮機保護制御装置を提供することを目的としている。   The present invention solves the above-described conventional problems, and in a compressor of a refrigeration cycle apparatus for an air conditioner installed under extremely low outside air temperature conditions, the suction pressure can be maintained above a certain level and stable heating is achieved. An object of the present invention is to provide a compressor protection control device for an air conditioner that provides operation and provides a refrigeration cycle capable of sufficient low-pressure protection and has high reliability.

上記従来の課題を解決するために、本発明の空気調和機の圧縮機保護制御装置は、圧縮機、四方弁、蒸発器、減圧器、凝縮器を具備した空気調和機の暖房運転時に前記蒸発器の冷媒入口側に連結された配管の温度を検出する室外配管温度検出手段と、前記圧縮機の運転周波数を制御する圧縮機運転周波数制御手段と、前記室外配管温度検出手段により検出した配管温度が第1の所定設定温度より低下し、且つ第2の所定設定温度を上回っているときに、前記配管温度が前記第1の所定設定温度より低下したことを検出し出力する配管温度比較検出手段を備え、前記配管温度比較検出手段により境界値低下信号Aが出力された場合、前記圧縮機運転周波数制御手段により、最大圧縮機運転周波数を下げる空気調和機の圧縮機保護制御装置において、前記圧縮機の吸入側の配管の温度を検出する吸入温度検出手段を設け、前記吸入温度検出手段で検出された吸入温度と、前記配管温度との差、いわゆる前記蒸発器の圧力損失分に応じて、前記第1及び前記第2の所定設定温度を補正するもので、吸入圧力の異常低下を防止し、かつ一定以上に保つことができ、かつ安定した冷凍サイクルの暖房運転状態を維持することができ、蒸発器の圧力損失分を第1及び第2の所定設定温度から補正することで、更により精度の良い吸入圧力で十分な低圧保護が可能となる。   In order to solve the above-described conventional problems, the compressor protection control device for an air conditioner according to the present invention includes a compressor, a four-way valve, an evaporator, a pressure reducer, and a condenser during the heating operation of the air conditioner. Outdoor pipe temperature detecting means for detecting the temperature of the pipe connected to the refrigerant inlet side of the compressor, compressor operating frequency control means for controlling the operating frequency of the compressor, and pipe temperature detected by the outdoor pipe temperature detecting means Pipe temperature comparison detection means for detecting and outputting that the pipe temperature has dropped below the first predetermined set temperature when the temperature is lower than the first predetermined set temperature and higher than the second predetermined set temperature. In the compressor protection control device for an air conditioner that lowers the maximum compressor operating frequency by the compressor operating frequency control means when the boundary temperature lowering signal A is output by the pipe temperature comparison detecting means. A suction temperature detecting means for detecting the temperature of the pipe on the suction side of the compressor, and a difference between the suction temperature detected by the suction temperature detecting means and the pipe temperature, so-called pressure loss of the evaporator Accordingly, the first and second predetermined set temperatures are corrected to prevent abnormal lowering of the suction pressure, and can be maintained at a certain level or more, and a stable heating operation state of the refrigeration cycle is maintained. In addition, by correcting the pressure loss of the evaporator from the first and second predetermined set temperatures, a sufficiently low pressure protection can be achieved with a more accurate suction pressure.

本発明の空気調和機の圧縮機保護制御装置は、極低外気温度条件に設置された冷凍サイクル装置の圧縮機において、吸入圧力を一定以上に保つことができ、かつ安定した暖房運転を提供すると共に、十分な低圧保護が可能な冷凍サイクルを提供し、かつ信頼性の高いものである。   The compressor protection control device for an air conditioner according to the present invention is capable of maintaining a suction pressure at a certain level or more and providing a stable heating operation in a compressor of a refrigeration cycle apparatus installed at extremely low outside air temperature conditions. At the same time, it provides a refrigeration cycle capable of sufficient low-pressure protection and is highly reliable.

第1の発明は、圧縮機、四方弁、蒸発器、減圧器、凝縮器を具備した空気調和機の暖房運転時に前記蒸発器の冷媒入口側に連結された配管の温度を検出する室外配管温度検出手段と、前記圧縮機の運転周波数を制御する圧縮機運転周波数制御手段と、前記室外配管温度検出手段により検出した配管温度が第1の所定設定温度より低下し、且つ第2の所定設定温度を上回っているときに、前記配管温度が前記第1の所定設定温度より低下したことを検出し出力する配管温度比較検出手段を備え、前記配管温度比較検出手段により境界値低下信号Aが出力された場合、前記圧縮機運転周波数制御手段により、最大圧縮機運転周
波数を下げる空気調和機の圧縮機保護制御装置において、前記圧縮機の吸入側の配管の温度を検出する吸入温度検出手段を設け、前記吸入温度検出手段で検出された吸入温度と、前記配管温度との差、いわゆる前記蒸発器の圧力損失分に応じて、前記第1及び前記第2の所定設定温度を補正するもので、吸入圧力の異常低下を防止し、かつ一定以上に保つことができ、かつ安定した冷凍サイクルの暖房運転状態を維持することができ、蒸発器の圧力損失分を第1及び第2の所定設定温度から補正することで、更により精度の良い吸入圧力で十分な低圧保護が可能となる。
The first aspect of the invention is an outdoor pipe temperature for detecting the temperature of a pipe connected to the refrigerant inlet side of the evaporator during heating operation of an air conditioner equipped with a compressor, a four-way valve, an evaporator, a decompressor, and a condenser. Detecting means, compressor operating frequency control means for controlling the operating frequency of the compressor, and pipe temperature detected by the outdoor pipe temperature detecting means being lower than a first predetermined set temperature, and a second predetermined set temperature. A pipe temperature comparison detecting means for detecting and outputting that the pipe temperature has fallen below the first predetermined set temperature, and a boundary value lowering signal A is output by the pipe temperature comparison detecting means. In the compressor protection control device for an air conditioner that lowers the maximum compressor operating frequency by the compressor operating frequency control means, the suction temperature detecting means for detecting the temperature of the suction side piping of the compressor The first and second predetermined set temperatures are corrected according to a difference between the suction temperature detected by the suction temperature detection means and the pipe temperature, that is, a pressure loss of the evaporator. The suction pressure can be prevented from being abnormally reduced and maintained at a certain level or more, and the stable heating operation state of the refrigeration cycle can be maintained, and the pressure loss of the evaporator is set to the first and second predetermined settings. By correcting from the temperature, sufficient low-pressure protection can be achieved with a more accurate suction pressure.

第2の発明は、特に、第1の発明の第1の所定設定温度を、通常暖房運転時の圧縮機の運転周波数に応じて補正するもので、例えば、極低温下にて高周波数で暖房運転されている場合は、圧縮機の使用可能圧力範囲から外れて予め決められた設定圧力以下に下がりやすいため、第1の所定設定温度を高めに補正して、早めに圧縮機周波数を低下させることで圧縮機の信頼性を向上させることができる。これにより、更により精度の良い吸入圧力で十分な低圧保護を可能にし、吸入圧力の異常低下を防止し、かつ一定以上に保つことができ、かつ安定した冷凍サイクルの暖房運転状態を維持することができる。   In particular, the second invention corrects the first predetermined set temperature of the first invention in accordance with the operating frequency of the compressor during normal heating operation, for example, heating at a high frequency under an extremely low temperature. When operating, the pressure tends to drop below a preset pressure that is out of the usable pressure range of the compressor, so the first predetermined set temperature is corrected to a higher value and the compressor frequency is lowered earlier. Thus, the reliability of the compressor can be improved. As a result, sufficient low-pressure protection can be achieved with a more accurate suction pressure, an abnormal decrease in the suction pressure can be prevented, and it can be kept above a certain level, and a stable refrigeration cycle heating operation state can be maintained. Can do.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(実施の形態1)
本発明の第1の実施の形態における空気調和機の圧縮機保護制御装置について、図1〜4を用いて説明する。図1は、本実施の形態における空気調和機の圧縮機保護制御装置を搭載した空気調和機の構成図、図2は、同空気調和機の圧縮機保護制御装置の制御ブロック図である。
(Embodiment 1)
A compressor protection control device for an air conditioner according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of an air conditioner equipped with a compressor protection control device for an air conditioner according to the present embodiment, and FIG. 2 is a control block diagram of the compressor protection control device for the air conditioner.

図1中の矢印は、暖房運転時の冷媒の流方向を示しており、本実施の形態における圧縮機保護制御装置を搭載した空気調和機は、圧縮機1と、四方弁2と、凝縮器3と、減圧器4と、蒸発器5と、蒸発器5の冷媒入口側に連結された配管の温度を検出する室外配管温度検出手段6と、圧縮機1の吸入側の配管の温度を検出する吸入温度検出手段7とを具備している。尚、上記減圧器4は、電磁膨張弁でもよい。   The arrows in FIG. 1 indicate the flow direction of the refrigerant during the heating operation, and the air conditioner equipped with the compressor protection control device in the present embodiment includes the compressor 1, the four-way valve 2, and the condenser. 3, a decompressor 4, an evaporator 5, an outdoor pipe temperature detecting means 6 for detecting the temperature of a pipe connected to the refrigerant inlet side of the evaporator 5, and a temperature of a pipe on the suction side of the compressor 1 are detected. Inhalation temperature detection means 7 is provided. The decompressor 4 may be an electromagnetic expansion valve.

図2において、20は、本実施の形態における圧縮機保護制御装置で、蒸発器5の冷媒入口側に連結された配管の温度を検出する室外配管温度検出手段6と、圧縮機1の吸入側の配管の温度を検出する吸入温度検出手段7と、吸入温度検出手段7で検出された吸入温度と室外配管温度検出手段6で検出された蒸発器5の冷媒入口側に連結された配管の温度との差、いわゆる室外熱交換器の圧力損失分を演算し、第1及び第2の所定設定温度から補正する圧力損失補正演算手段8と、通常暖房運転時の運転周波数を検出する通常暖房運転周波数検出手段9と、運転周波数に応じて第1及び第2の所定設定温度を補正する運転周波数補正演算手段10を設けている。   In FIG. 2, reference numeral 20 denotes a compressor protection control device according to the present embodiment, an outdoor pipe temperature detecting means 6 for detecting the temperature of a pipe connected to the refrigerant inlet side of the evaporator 5, and a suction side of the compressor 1. The suction temperature detection means 7 for detecting the temperature of the pipe, the suction temperature detected by the suction temperature detection means 7 and the temperature of the pipe connected to the refrigerant inlet side of the evaporator 5 detected by the outdoor pipe temperature detection means 6 And a so-called outdoor heat exchanger pressure loss, and a pressure loss correction calculating means 8 for correcting from the first and second predetermined set temperatures, and a normal heating operation for detecting the operating frequency during the normal heating operation A frequency detecting means 9 and an operating frequency correction calculating means 10 for correcting the first and second predetermined set temperatures according to the operating frequency are provided.

更に、圧縮機1の運転周波数を制御する圧縮機運転周波数制御手段22を設け、室外配管温度検出手段6により検出した温度が、圧力損失補正演算手段8または運転周波数補正演算手段10で補正された第1の所定設定温度より低下し、且つ補正された第2の所定設定温度を上回っているときは、前記第1の所定設定温度より低下したことを検出し出力する配管温度比較検出手段21を設け、配管温度比較検出手段21による境界値低下信号Aが出力された場合、圧縮機運転周波数制御手段22により、圧縮機1の運転周波数を下げることで吸入圧力を一定以上に保つことができ低圧保護を行うことができる。   Furthermore, the compressor operating frequency control means 22 for controlling the operating frequency of the compressor 1 is provided, and the temperature detected by the outdoor pipe temperature detecting means 6 is corrected by the pressure loss correction calculating means 8 or the operating frequency correction calculating means 10. When the temperature is lower than the first predetermined set temperature and exceeds the corrected second predetermined set temperature, the pipe temperature comparison detecting means 21 for detecting and outputting that the temperature is lower than the first predetermined set temperature is provided. When the boundary value lowering signal A is output by the pipe temperature comparison / detection means 21, the compressor operating frequency control means 22 can keep the suction pressure at a certain level or lower by lowering the operating frequency of the compressor 1. Protection can be performed.

また、室外配管温度検出手段6により検出した温度が圧力損失補正演算手段8または運転周波数補正演算手段10で補正された第2の所定設定温度より低下したときは、配管温
度比較検出手段21により第2の所定設定温度より低下したことを検出し、境界値低下信号Bを出力させ、連続して所定の設定時間以上出力されたことを検出し、出力する連続出力検出手段23を設け、連続出力検出手段23の出力により、圧縮機停止手段24で圧縮機1を停止させるよう制御する。
When the temperature detected by the outdoor pipe temperature detecting means 6 falls below the second predetermined set temperature corrected by the pressure loss correction calculating means 8 or the operating frequency correction calculating means 10, the pipe temperature comparison detecting means 21 2 is detected, the boundary value lowering signal B is output, a continuous output detecting means 23 is provided for detecting and outputting that the signal has been continuously output for a predetermined set time or longer. Based on the output of the detecting means 23, the compressor stopping means 24 controls the compressor 1 to stop.

次に図3は、極低外気温度条件に設置された空気調和機の冷凍サイクル装置の圧縮機において、暖房運転時に圧縮機低圧保護制御を行う場合のフローチャートである。   Next, FIG. 3 is a flowchart when the compressor low-pressure protection control is performed during the heating operation in the compressor of the refrigeration cycle apparatus of the air conditioner installed in the extremely low outside air temperature condition.

同図において、極低外気温度条件に設置された冷凍サイクル装置の圧縮機1は、暖房運転されると圧縮比が高い状態で通常運転(S101)される。このとき室外配管温度検出手段6にて蒸発器5の冷媒入口側に連結された配管の温度tを検出(S102)し、吸入温度検出手段7にて、圧縮機1の吸入側の配管の温度kを検出(S103)し、通常暖房運転周波数検出手段9にて通常暖房運転時の運転周波数hを検出(S104)する。   In the figure, the compressor 1 of the refrigeration cycle apparatus installed under extremely low outside air temperature conditions is normally operated (S101) with a high compression ratio when heated. At this time, the outdoor pipe temperature detection means 6 detects the temperature t of the pipe connected to the refrigerant inlet side of the evaporator 5 (S102), and the suction temperature detection means 7 detects the temperature of the suction side pipe of the compressor 1. k is detected (S103), and the normal heating operation frequency detection means 9 detects the operation frequency h during normal heating operation (S104).

吸入温度検出手段7で検出された吸入温度kと室外配管温度検出手段6で検出された蒸発器5の冷媒入口側に連結された配管の温度tとの差の圧力損失Δp=t−kを演算(S105)し、第1の所定設定温度T1及び第2の所定設定温度T2からT1=T1+Δp及びT2=T2+Δpの補正(S106)を行う。   The pressure loss Δp = t−k of the difference between the suction temperature k detected by the suction temperature detection means 7 and the temperature t of the pipe connected to the refrigerant inlet side of the evaporator 5 detected by the outdoor pipe temperature detection means 6 Calculation (S105) is performed to correct T1 = T1 + Δp and T2 = T2 + Δp (S106) from the first predetermined set temperature T1 and the second predetermined set temperature T2.

また、通常暖房運転周波数検出手段9にて検出された通常暖房運転時の運転周波数hと所定の周波数Hとの比較(S107)を行いh>Hの場合、運転周波数補正演算手段10で、第1の所定設定温度T1及び第2の所定設定温度T2に設定された加算温度jを加算し、T1=T1+j及びT2=T2+jの補正(S108)を行う。室外配管温度検出手段6にて検出した温度tが、補正された第1の所定設定温度T1より低下し、且つ補正された第2の所定設定温度T2を上回っているかを配管温度比較検出手段21で比較し(S109)、第1の所定設定温度T1より低下し、且つ第2の所定設定温度T2を上回っていることを検出した場合は、境界値低下信号Aを、圧縮機運転周波数制御手段22に出力(S111)する。圧縮機運転周波数制御手段22に境界値低下信号Aが出力されると、圧縮機1の運転周波数hを下げる(S112)ことにより、吸入圧力の異常低下を防止し、かつ一定以上に保つことができる。   In addition, the operation frequency h during normal heating operation detected by the normal heating operation frequency detection means 9 is compared with a predetermined frequency H (S107), and if h> H, the operation frequency correction calculation means 10 Addition temperature j set to 1 predetermined set temperature T1 and 2 predetermined set temperature T2 is added, and correction of T1 = T1 + j and T2 = T2 + j is performed (S108). Whether the temperature t detected by the outdoor pipe temperature detecting means 6 is lower than the corrected first predetermined set temperature T1 and is higher than the corrected second predetermined set temperature T2, is the pipe temperature comparison detecting means 21. (S109), if it is detected that the temperature is lower than the first predetermined set temperature T1 and exceeds the second predetermined set temperature T2, the boundary value lowering signal A is sent to the compressor operating frequency control means. 22 (S111). When the boundary value lowering signal A is output to the compressor operating frequency control means 22, the operating frequency h of the compressor 1 is lowered (S 112), thereby preventing an abnormal drop in the suction pressure and keeping it above a certain level. it can.

また、室外配管温度検出手段6で検出された蒸発器5の冷媒入口側配管の温度tと配管温度比較検出手段21で補正された第2の所定設定温度T2とを比較(S110)し、蒸発器5の冷媒入口側配管の温度tが、第2の所定設定温度T2より低下した場合は、境界値低下信号Bを連続出力検出手段23に出力(S113)する。連続出力検出手段23にて、境界値低下信号Bが所定の設定時間C秒出力されたかを判定し(S114)、所定の設定時間C秒を経過した場合、連続出力を検出(S115)し、圧縮機停止手段24によって圧縮機1を停止(S116)して、圧縮機1の保護を行うようにしている。   Further, the temperature t of the refrigerant inlet side pipe of the evaporator 5 detected by the outdoor pipe temperature detecting means 6 is compared with the second predetermined set temperature T2 corrected by the pipe temperature comparison detecting means 21 (S110) to evaporate. When the temperature t of the refrigerant inlet side pipe of the vessel 5 falls below the second predetermined set temperature T2, the boundary value lowering signal B is outputted to the continuous output detecting means 23 (S113). The continuous output detecting means 23 determines whether or not the boundary value lowering signal B has been output for a predetermined set time C seconds (S114). When the predetermined set time C seconds has elapsed, a continuous output is detected (S115), The compressor 1 is stopped by the compressor stop means 24 (S116) to protect the compressor 1.

図4は、本実施の形態における空気調和機の圧縮機保護制御装置による室外配管温度制御図である。   FIG. 4 is an outdoor pipe temperature control diagram by the compressor protection control device of the air conditioner in the present embodiment.

同図において、上方が検出された室外配管温度が高く、下方ほど検出された室外配管温度が低いことを示し、上記に示すような図3のフローチャートにしたがって、図4、図5に示すように制御動作が行われるものである。   In the same figure, the outdoor pipe temperature detected in the upper part is high and the outdoor pipe temperature detected in the lower part is low, and as shown in FIGS. 4 and 5 according to the flowchart of FIG. A control operation is performed.

a点では、室外配管温度検出手段6にて蒸発器5の冷媒入口側に連結された配管の温度tが、圧力損失演算や運転周波数に応じて補正された第1の所定設定温度T1以上にある為、通常運転されている。   At point a, the temperature t of the pipe connected to the refrigerant inlet side of the evaporator 5 by the outdoor pipe temperature detection means 6 is equal to or higher than the first predetermined set temperature T1 corrected according to the pressure loss calculation and the operating frequency. Because there is, it is operating normally.

b点では、検出した室外配管温度tが、補正された第1の所定設定温度T1より低下し、且つ圧力損失演算や運転周波数に応じて補正された第2の所定設定温度T2、いわゆる圧縮機1の使用可能な吸入圧力限界相当の所定の設定温度を上回っている為、圧縮機運転周波数制御手段22により、運転周波数を下げ、吸入圧力の異常低下を防止し、かつ一定以上に保つことができる。   At the point b, the detected outdoor pipe temperature t is lower than the corrected first predetermined set temperature T1, and the second predetermined set temperature T2 corrected according to the pressure loss calculation and the operating frequency, a so-called compressor. Since the predetermined set temperature corresponding to the usable suction pressure limit of 1 is exceeded, the compressor operating frequency control means 22 can reduce the operating frequency to prevent an abnormal decrease in the suction pressure and keep it above a certain level. it can.

c点のように、室外配管温度tが圧縮機1の使用可能吸入圧力限界相当である補正された第2の所定設定温度T2を下回った場合、所定の設定時間C秒を経過後、圧縮機1の保護の為、圧縮機1を停止させることで圧縮機1の保護を行う。d点のように室外配管温度tが、所定の設定時間C秒を経過する前に、補正された第2の所定設定温度T2を上回った場合は、圧縮機1を停止させずに、運転周波数を下げることで、吸入圧力の低下を防止し、かつ一定以上に保つよう制御する。更に、e点のように、運転周波数を下げることで室外配管温度tが、補正された第1の所定設定温度T1より上回った場合は、通常運転に戻るよう制御する。   When the outdoor pipe temperature t falls below the corrected second predetermined set temperature T2 corresponding to the usable suction pressure limit of the compressor 1 as indicated by the point c, after the predetermined set time C seconds elapses, the compressor In order to protect 1, the compressor 1 is protected by stopping the compressor 1. When the outdoor pipe temperature t exceeds the corrected second predetermined set temperature T2 before the predetermined set time C seconds elapses as indicated by point d, the operating frequency is not stopped without stopping the compressor 1. Is controlled to prevent a decrease in suction pressure and to keep it at a certain level or more. Further, when the outdoor piping temperature t is higher than the corrected first predetermined temperature T1 by lowering the operation frequency as shown by the point e, control is performed so as to return to the normal operation.

また、上記実施の形態では、補正された第1の所定設定温度T1と、補正された第2の所定設定温度T2をそれぞれ設定しているが、図5に示すように、第1の所定設定温度T1あるいは第2の所定設定温度T2、もしくは、第1・第2の所定設定温度T1・T2の両方にそれぞれT3(>T1)、T4(>T2)とヒステリシスを設けるようにすれば、室外配管温度tが、制御動作の圧縮機1の停止の領域と運転周波数を下げる領域と通常運転の領域とをループまたはハンチングするのを防ぐことができる。   In the above embodiment, the corrected first predetermined set temperature T1 and the corrected second predetermined set temperature T2 are set. As shown in FIG. 5, the first predetermined set temperature T1 is set. If hysteresis is provided for the temperature T1 or the second predetermined set temperature T2, or both the first and second predetermined set temperatures T1 and T2, respectively, and the hysteresis, the outdoor It is possible to prevent the piping temperature t from looping or hunting the area where the compressor 1 in the control operation is stopped, the area where the operation frequency is lowered, and the area where the operation is normal.

以上のように、本実施の形態によれば、吸入温度検出手段7で検出された吸入温度と、室外配管温度検出手段6で検出された配管温度との差、いわゆる蒸発器5の圧力損失分に応じて、第1及び第2の所定設定温度T1、T2を補正するので、吸入圧力の異常低下を防止し、かつ一定以上に保つことができ、より精度の良い吸入圧力で十分な低圧保護を可能とし、安定した冷凍サイクルの暖房運転状態を維持することができる。   As described above, according to the present embodiment, the difference between the suction temperature detected by the suction temperature detection means 7 and the pipe temperature detected by the outdoor pipe temperature detection means 6, the pressure loss of the so-called evaporator 5. Accordingly, the first and second predetermined set temperatures T1 and T2 are corrected, so that an abnormal decrease in the suction pressure can be prevented and maintained at a certain level or more, and sufficient low pressure protection can be achieved with a more accurate suction pressure. And a stable heating operation state of the refrigeration cycle can be maintained.

また、室外配管温度検出手段6により検出した温度が、補正された第2の所定設定温度より低下したときは、配管温度比較検出手段21により第2の所定設定温度より低下したことを検出し境界値低下信号Bを出力させる。前記境界値低下信号Bを連続して所定の設定時間以上出力されたことを検出し、出力する連続出力検出手段23を設け、前記連続出力検出手段23の出力により圧縮機1を停止させることにより、圧縮機1の保護を行うことができる。   Further, when the temperature detected by the outdoor pipe temperature detecting means 6 is lower than the corrected second predetermined set temperature, the pipe temperature comparison detecting means 21 detects that the temperature is lower than the second predetermined set temperature and detects the boundary. A value lowering signal B is output. By detecting that the boundary value lowering signal B has been continuously output for a predetermined set time or longer and providing continuous output detecting means 23, the compressor 1 is stopped by the output of the continuous output detecting means 23. The compressor 1 can be protected.

また、補正された第1の所定設定温度あるいは、補正された第2の所定設定温度、もしくは補正された第1・第2の所定設定温度の両方にヒステリシスを設けることにより、電子制御回路に設けられた室外配管温度センサーの温度が制御動作の圧縮機運転周波数制御手段22による圧縮機1の運転周波数を変える領域と、連続出力検出手段23の出力により圧縮機1を停止させる領域とをループまたはハンチングするのを防ぐことができる。   Further, by providing hysteresis to the corrected first predetermined set temperature, the corrected second predetermined set temperature, or both the corrected first and second predetermined set temperatures, the hysteresis is provided in the electronic control circuit. A region in which the operating frequency of the compressor 1 by the compressor operating frequency control means 22 in which the temperature of the outdoor pipe temperature sensor thus controlled is controlled and a region in which the compressor 1 is stopped by the output of the continuous output detecting means 23 are looped or Hunting can be prevented.

例えば、一般に室外気温が−20℃の極低温時の野外に設置され暖房運転を行った場合、高周波数運転がなされ着霜状態によっては、低圧が著しく低下し予め決められた圧縮比上限を超えてしまう恐れがあり、圧縮機1のメカ部に入ってくるオイル供給量が減少する為、圧縮機1を停止させないと圧縮機1の信頼性が悪化することとなるが、本実施の形態によれば、蒸発器5の圧力損失分を第1の所定設定温度から補正し、より精度の良い吸入圧力で十分な低圧保護が可能となり、室外配管温度が、補正された第1の所定設定温度より低下し、且つ補正された第2の所定設定温度を上回っているときは、運転周波数を下げ、吸入圧力の異常低下を防止し、かつ一定以上に保つことができる。また、室外配管温度が補正された第2の所定設定温度より低下し、所定の設定時間運転されると圧縮機1を停
止させるので、圧縮機1の保護を確実に行うことができる。
For example, in general, when the outdoor temperature is set in the outdoors at an extremely low temperature of −20 ° C. and heating operation is performed, high frequency operation is performed, and depending on the frosting state, the low pressure is remarkably reduced and exceeds the predetermined compression ratio upper limit. Since the amount of oil supplied to the mechanical part of the compressor 1 decreases, the reliability of the compressor 1 deteriorates unless the compressor 1 is stopped. According to this, the pressure loss of the evaporator 5 is corrected from the first predetermined set temperature, and sufficient low-pressure protection is possible with a more accurate suction pressure, and the outdoor pipe temperature is corrected to the first predetermined set temperature. When the temperature is further lowered and exceeds the corrected second predetermined set temperature, the operating frequency can be lowered to prevent an abnormal drop in the suction pressure and can be kept above a certain level. Further, since the compressor 1 is stopped when the outdoor piping temperature falls below the corrected second predetermined set temperature and is operated for a predetermined set time, the compressor 1 can be reliably protected.

以上のように本発明にかかる空気調和機の圧縮機保護制御装置は、極低外気温度条件に設置された空気調和機の冷凍サイクル装置の圧縮機において、より精度の良い吸入圧力で十分な低圧保護が可能となり、吸入圧力を一定以上に保つことができ、かつ安定した暖房運転を提供し、信頼性の高い空気調和機を提供することができるので、室外温度が非常に低温の寒冷地での空気調和機にも適用できる。   As described above, the compressor protection control device for an air conditioner according to the present invention is a sufficiently low pressure with a more accurate suction pressure in a compressor of a refrigeration cycle device for an air conditioner installed in extremely low outside air temperature conditions. Protection is possible, the suction pressure can be kept above a certain level, stable heating operation can be provided, and a highly reliable air conditioner can be provided. It can also be applied to other air conditioners.

本発明の実施の形態1における空気調和機の圧縮機保護制御装置を搭載した空気調和機の構成図1 is a configuration diagram of an air conditioner equipped with a compressor protection control device for an air conditioner according to Embodiment 1 of the present invention. 同空気調和機の圧縮機保護制御装置の制御ブロック図Control block diagram of compressor protection control device for the air conditioner 同空気調和機の圧縮機保護制御装置による圧縮機保護制御のフローチャートFlow chart of compressor protection control by the compressor protection control device of the air conditioner 同空気調和機の圧縮機保護制御装置による室外配管温度制御図Outdoor piping temperature control diagram by compressor protection control device of the air conditioner 同空気調和機の圧縮機保護制御装置による室外配管温度制御の他の例を示す図The figure which shows the other example of outdoor piping temperature control by the compressor protection control apparatus of the air conditioner 従来の空気調和機の圧縮機保護制御装置を搭載した空気調和機の冷凍サイクル装置の構成図Configuration diagram of refrigeration cycle device for air conditioner equipped with compressor protection control device for conventional air conditioner

符号の説明Explanation of symbols

1 圧縮機
2 四方弁
3 凝縮器
4 減圧器
5 蒸発器
6 室外配管温度検出手段
7 吸入温度検出手段
8 圧力損失補正演算手段
9 通常暖房運転周波数検出手段
10 運転周波数補正演算手段
11 電磁弁
20 圧縮機保護制御装置
21 配管温度比較検出手段
22 圧縮機運転周波数制御手段
23 連続出力検出手段
24 圧縮機停止手段
DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Condenser 4 Pressure reducer 5 Evaporator 6 Outdoor piping temperature detection means 7 Suction temperature detection means 8 Pressure loss correction calculation means 9 Normal heating operation frequency detection means 10 Operation frequency correction calculation means 11 Electromagnetic valve 20 Compression Machine protection control device 21 Pipe temperature comparison detection means 22 Compressor operating frequency control means 23 Continuous output detection means 24 Compressor stop means

Claims (2)

圧縮機、四方弁、蒸発器、減圧器、凝縮器を具備した空気調和機の暖房運転時に前記蒸発器の冷媒入口側に連結された配管の温度を検出する室外配管温度検出手段と、前記圧縮機の運転周波数を制御する圧縮機運転周波数制御手段と、前記室外配管温度検出手段により検出した配管温度が第1の所定設定温度より低下し、且つ第2の所定設定温度を上回っているときに、前記配管温度が前記第1の所定設定温度より低下したことを検出し出力する配管温度比較検出手段を備え、前記配管温度比較検出手段により境界値低下信号Aが出力された場合、前記圧縮機運転周波数制御手段により、最大圧縮機運転周波数を下げる空気調和機の圧縮機保護制御装置において、前記圧縮機の吸入側の配管の温度を検出する吸入温度検出手段を設け、前記吸入温度検出手段で検出された吸入温度と、前記配管温度との差、いわゆる前記蒸発器の圧力損失分に応じて、前記第1及び前記第2の所定設定温度を補正することを特徴とした空気調和機の圧縮機保護制御装置。 Outdoor pipe temperature detecting means for detecting the temperature of the pipe connected to the refrigerant inlet side of the evaporator during heating operation of the air conditioner having a compressor, a four-way valve, an evaporator, a decompressor, and a condenser; and the compression Compressor operating frequency control means for controlling the operating frequency of the machine, and when the pipe temperature detected by the outdoor pipe temperature detecting means is lower than the first predetermined set temperature and exceeds the second predetermined set temperature. And a pipe temperature comparison detecting means for detecting and outputting that the pipe temperature has fallen below the first predetermined set temperature, and when the boundary value lowering signal A is output by the pipe temperature comparison detecting means, the compressor In the compressor protection control device for an air conditioner that lowers the maximum compressor operating frequency by the operating frequency control means, suction temperature detecting means for detecting the temperature of the piping on the suction side of the compressor is provided, and the suction An air characterized in that the first and second predetermined set temperatures are corrected in accordance with a difference between the suction temperature detected by the temperature detecting means and the pipe temperature, that is, a pressure loss of the evaporator. Compressor protection control device for a harmonic machine. 第1の所定設定温度を、通常暖房運転時の圧縮機の運転周波数に応じて補正することを特徴とした請求項1に記載の空気調和機の圧縮機保護制御装置。 The compressor protection control device for an air conditioner according to claim 1, wherein the first predetermined set temperature is corrected in accordance with an operating frequency of the compressor during normal heating operation.
JP2008044204A 2008-02-26 2008-02-26 Compressor protecting controlling device for air conditioner Pending JP2009204168A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014066465A (en) * 2012-09-27 2014-04-17 Hitachi Appliances Inc Air conditioner
CN106440587A (en) * 2016-09-29 2017-02-22 海信(广东)空调有限公司 An air conditioner cooling control method and air conditioner
CN108224703A (en) * 2017-12-25 2018-06-29 青岛海尔空调电子有限公司 The control method of air-conditioning
CN114001446A (en) * 2020-07-28 2022-02-01 广东美的制冷设备有限公司 Air conditioner control method, air conditioner and computer readable storage medium
CN114811914A (en) * 2022-05-13 2022-07-29 宁波奥克斯电气股份有限公司 Control method of air conditioner and air conditioner
CN114811835A (en) * 2022-05-23 2022-07-29 宁波奥克斯电气股份有限公司 Air conditioner control method and device and air conditioner
WO2024127571A1 (en) * 2022-12-15 2024-06-20 三菱電機株式会社 Refrigeration cycle device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014066465A (en) * 2012-09-27 2014-04-17 Hitachi Appliances Inc Air conditioner
CN106440587A (en) * 2016-09-29 2017-02-22 海信(广东)空调有限公司 An air conditioner cooling control method and air conditioner
CN108224703A (en) * 2017-12-25 2018-06-29 青岛海尔空调电子有限公司 The control method of air-conditioning
WO2019128396A1 (en) * 2017-12-25 2019-07-04 青岛海尔空调电子有限公司 Control method for air conditioner
US11506436B2 (en) 2017-12-25 2022-11-22 Qingdao Haier Air-Conditioning Electronic Co., Ltd Method for controlling freezing of indoor unit, outdoor unit and/or unit connection pipe of air conditioner
CN114001446A (en) * 2020-07-28 2022-02-01 广东美的制冷设备有限公司 Air conditioner control method, air conditioner and computer readable storage medium
CN114811914A (en) * 2022-05-13 2022-07-29 宁波奥克斯电气股份有限公司 Control method of air conditioner and air conditioner
CN114811914B (en) * 2022-05-13 2023-09-08 宁波奥克斯电气股份有限公司 Air conditioner control method and air conditioner
CN114811835A (en) * 2022-05-23 2022-07-29 宁波奥克斯电气股份有限公司 Air conditioner control method and device and air conditioner
CN114811835B (en) * 2022-05-23 2023-09-01 宁波奥克斯电气股份有限公司 Air conditioner control method and device and air conditioner
WO2024127571A1 (en) * 2022-12-15 2024-06-20 三菱電機株式会社 Refrigeration cycle device

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