JP2000154954A - Control method of air conditioner - Google Patents

Control method of air conditioner

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Publication number
JP2000154954A
JP2000154954A JP10330426A JP33042698A JP2000154954A JP 2000154954 A JP2000154954 A JP 2000154954A JP 10330426 A JP10330426 A JP 10330426A JP 33042698 A JP33042698 A JP 33042698A JP 2000154954 A JP2000154954 A JP 2000154954A
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JP
Japan
Prior art keywords
temperature
compressor
heat exchanger
indoor heat
air conditioner
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10330426A
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Japanese (ja)
Inventor
Motoyoshi Fujishiro
基芳 藤城
Original Assignee
Fujitsu General Ltd
株式会社富士通ゼネラル
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Publication date
Application filed by Fujitsu General Ltd, 株式会社富士通ゼネラル filed Critical Fujitsu General Ltd
Priority to JP10330426A priority Critical patent/JP2000154954A/en
Publication of JP2000154954A publication Critical patent/JP2000154954A/en
Application status is Pending legal-status Critical

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Abstract

PROBLEM TO BE SOLVED: To provide a control method of an air conditioner wherein a compressor is protected by making in an early stage a judgment of refrigerant shortage irrespectively of outside temperature.
SOLUTION: A second set temperature lower than a set temperature of a compressor 1 and a set temperature of an indoor heat exchanger 4 are provided, an intermediate temperature of the indoor heat exchanger 4 is detected, and, when a predetermined time has elapsed after start of a heating operation, temperature of the compressor 1 exceeds the second set temperature and the intermediate temperature of the indoor heat exchanger 4 is lower than the set temperature, a judgment of refrigerant shortage is made and operation of the compressor 1 is stopped. Therefore, in the case wherein outside temperature is low or the like case, the judgment of refrigerant shortage is made in such an early stage as before temperature of the compressor 1 exceeds the set temperature corresponding to an allowable highest temperature of the compressor 1, and a damage of the compressor is surely prevented.
COPYRIGHT: (C)2000,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、空気調和機の制御方法に係わり、とくに冷媒不足を早期に検出して圧縮機を保護するものに関する。 The present invention relates to relates to those involved in the control method of an air conditioner, in particular to protect the compressor by detecting the refrigerant shortage at an early stage.

【0002】 [0002]

【従来の技術】従来、圧縮機1、室内熱交換器4、絞り機構5、室外熱交換器3を順次循環する冷凍サイクルを有し、冷房運転および暖房運転を可能とした空気調和機の制御方法は、図4のフローチャートに示すように、その暖房運転開始(ST0')して、15分経過(ST Conventionally, the compressor 1, the indoor heat exchanger 4, an aperture stop mechanism 5 sequentially circulating the refrigeration cycle of the outdoor heat exchanger 3, the cooling operation and enables the heating operation and the control of the air conditioner method, as shown in the flowchart of FIG. 4, and the heating operation starts (ST0 '), 15 minutes elapsed (ST
2)後、圧縮機1のケースまたは吐出口の温度を検出し、同圧縮機の温度Tcmp が圧縮機の所定の第1の設定温度Toff を超えた(ST3')場合にのみ冷媒不足と判断して圧縮機1の動作を停止(ST4')して圧縮機1を保護するようにしていた。 2) after detecting the temperature of the case or the discharge port of the compressor 1, the temperature Tcmp of the compressor exceeds a predetermined first set temperature Toff of the compressor (ST3 ') determines only the refrigerant shortage when the operation of the compressor 1 has been to protect the stop (ST4 ') to the compressor 1. しかし、この制御方法では、外気温度が低い場合、圧縮機の温度が急速には上昇しないため上記保護動作が遅れ、その間冷媒不足の状態で圧縮機が運転されてしまうので、圧縮機の給気圧力が低下して過負荷状態となり圧縮機を損傷する可能性があった。 However, in this control method, when the outside air temperature is low, the temperature of the compressor is delayed the protective operation because it does not rise quickly, because the compressor from being operated in the state of the refrigerant shortage during which charge air compressor pressure was a possibility of damaging the compressor becomes an overload state decreases.

【0003】 [0003]

【発明が解決しようとする課題】本発明は以上述べた問題点を解決し、外気温度の如何に係わらず冷媒不足を早期に判断して圧縮機を保護するようにした空気調和機の制御方法を提供することを目的としている。 The present invention invention is to solve the above solves the problems described above, the control method of an air conditioner so as to protect the compressor by determining a refrigerant shortage regardless of outside air temperature how early is an object of the present invention to provide a.

【0004】 [0004]

【課題を解決するための手段】本発明は上述の課題を解決するため、圧縮機、室内熱交換器、絞り機構、室外熱交換器を順次循環する冷凍サイクルを有し、冷房運転および暖房運転を可能とした空気調和機における暖房運転開始してから所定時間経過後、圧縮機のケースまたは吐出口の温度を検出し、同圧縮機の温度が設定温度を超えた場合に冷媒不足と判断し、圧縮機の動作を停止して保護するようにしてなる空気調和機の制御方法において、 The present invention SUMMARY OF] In order to solve the problems described above, the compressor, the indoor heat exchanger, throttle mechanism has a sequentially circulating the refrigeration cycle of the outdoor heat exchanger, cooling operation and heating operation after a predetermined time from the start of heating operation in possible and air conditioner, and detects the temperature of the case or the discharge port of the compressor, it is determined that the refrigerant shortage when the temperature of the compressor exceeds a set temperature in the control method of an air conditioner comprising as protected by stopping the operation of the compressor,
前記圧縮機の設定温度より低い第2の設定温度と、前記室内熱交換器の設定温度とを設けると共に、前記室内熱交換器の中間温度を検出し、暖房運転開始してから所定時間経過後、前記圧縮機の温度が第2の設定温度を超え、なお且つ前記室内熱交換器の中間温度が設定温度より低い場合に冷媒不足と判断して圧縮機の動作を停止するようにした空気調和機の制御方法としている。 Wherein a second set temperature lower than the set temperature of the compressor, provided with a set temperature of the indoor heat exchanger detects the intermediate temperature of the indoor heat exchanger, after a predetermined time from the start of heating operation the air conditioning the temperature of the compressor is to stop the second exceeds the set temperature, should be noted and the operation of the compressor is determined that the refrigerant shortage when intermediate temperature of the indoor heat exchanger is lower than the set temperature It is a control method of the machine.

【0005】暖房運転開始してから所定時間経過後、前記圧縮機の温度が前記第2の設定温度を超え、且つ同圧縮機の温度と前記室内熱交換器の中間温度との差が所定温度差以上となった場合に冷媒不足と判断して圧縮機の動作を停止するようにした空気調和機の制御方法としている。 [0005] After a predetermined time from the start of heating operation, the temperature of the compressor exceeds the second predetermined temperature, and the difference is the predetermined temperature of the intermediate temperature of the indoor heat exchanger and the temperature of the compressor and a controlling method of an air conditioner so as to stop the operation of the compressor is determined that the refrigerant shortage when a difference or more.

【0006】 [0006]

【発明の実施の形態】以上のように、本発明の空気調和機の制御方法においては、圧縮機の設定温度より低い第2の設定温度と、前記室内熱交換器の設定温度とを設けると共に、前記室内熱交換器の中間温度を検出し、暖房運転開始してから所定時間経過後、前記圧縮機の温度が第2の設定温度を超え、なお且つ前記室内熱交換器の中間温度が設定温度より低い場合に冷媒不足と判断して圧縮機の動作を停止するようにしたので、外気温度が低い場合等に、圧縮機の温度が圧縮機の許容最大温度である設定温度を超える前の早期に冷媒不足を判断でき、圧縮機の破損を確実に防止することができる。 As described above PREFERRED EMBODIMENTS In the control method of the air conditioner of the present invention, first and second set temperature lower than the set temperature of the compressor, provided with a set temperature of the indoor heat exchanger , to detect the intermediate temperature of the indoor heat exchanger, after a predetermined time has elapsed from the start of heating operation, the temperature of the compressor exceeds a second predetermined temperature, Note and intermediate temperature of the indoor heat exchanger set since so as to stop the operation of the compressor is determined that the refrigerant shortage is lower than the temperature, such as when the outside air temperature is low, before the temperature of the compressor exceeds a preset temperature is the maximum permissible temperature of the compressor early can determine refrigerant shortage, breakage of the compressor can be reliably prevented.

【0007】 [0007]

【実施例】以下、図面に基づいて本発明による空気調和機の制御方法を詳細に説明する。 EXAMPLES Hereinafter, the control method of an air conditioner according to the present invention will be described in detail with reference to the accompanying drawings. 図1は本発明による制御方法を適用する空気調和機の一実施例を示すブロック図である。 Figure 1 is a block diagram showing an embodiment of an air conditioner applying the control method according to the present invention. 図において、1は圧縮機、2は四方弁、3は室外熱交換器、4は室内熱交換器、5は絞り機構であり、冷凍サイクルを形成し、前記四方弁2を切り換えることにより冷房運転または暖房運転を可能としている。 In the figure, reference numeral 1 denotes a compressor, 2 four-way valve, 3 outdoor heat exchanger, 4 indoor heat exchanger 5 is throttle mechanism, cooling operation by forming a refrigeration cycle, it switches the four-way valve 2 or is it possible to heating operation.
また、6は前記圧縮機1のケースまたは吐出口の圧縮機温度Tcmp を検出する圧縮機温度センサである。 Also, 6 is a compressor temperature sensor for detecting a compressor temperature Tcmp case or discharge port of the compressor 1. 7は前記室内熱交換器4の中間部の室内熱交換器温度Trcを検出する室内熱交換器温度センサである。 7 is a temperature sensor indoor heat exchanger for detecting the indoor heat exchanger temperature Trc of the middle portion of the indoor heat exchanger 4. 8は前記圧縮機温度センサ6よりの検出信号等を入力し、圧縮機1、四方弁2等を制御する室外制御部である。 8 inputs the detection signal and the like from the compressor temperature sensor 6, the compressor 1, a outdoor control unit for controlling the four-way valve 2 and the like. この室外制御部8には圧縮機1の許容最大温度である設定温度Toff 、 Set temperature Toff is an allowable maximum temperature of the compressor 1 in the outdoor control unit 8,
保護動作を確認するための圧縮機の所定の第2の設定温度Ts2、冷媒不足を判断するための室内熱交換器の設定温度Ts3等を記憶するメモリ、および冷媒不足を判断する判断手段を含んでいる。 Comprise determining means for determining a memory, and a refrigerant shortage for storing the set temperature Ts3 etc. of the indoor heat exchanger to determine the second set temperature Ts2, the refrigerant shortage predetermined compressor to check the protection operation They are out. 9は前記室内熱交換器温度センサ7よりの検出信号等を入力し、室内ファン11を制御するとともに前記室外制御部8と情報を交換する室内制御部である。 9 inputs the detection signal and the like from the indoor heat exchanger temperature sensor 7, an indoor control unit for exchanging the outdoor control unit 8 and the information to control the indoor fan 11. 10は前記室外制御部8に制御されて室外熱交換器3に送風する室外ファンである。 10 is a outdoor fan for blowing air to the outdoor heat exchanger 3 is controlled by the outdoor control unit 8. 11は前記室内ファンである。 11 is the indoor fan.

【0008】図2および図3は、以上の構成を有する空気調和機の制御方法を説明するフローチャート図である。 [0008] Figures 2 and 3 are flowcharts illustrating a control method of an air conditioner having the above configuration. 以下に、同図を参照しながら本発明の空気調和機の制御方法を詳細に説明するがまず図2について説明する。 Hereinafter will be described a control method of the air conditioner of the present invention with reference to FIG detail first with reference to FIG. 2 will be described. 図2の実施例の場合、まず、暖房運転が開始され(ST0)、圧縮機が始動され(ST1)、15分経過(ST2)後、前記圧縮機温度Tcmp と予め設定された所定の第2の設定温度Ts2と比較(ST3)される。 For Example 2, first, the heating operation is started (ST0), the compressor is started (ST1), after 15 min (ST2) after the compressor temperature Tcmp preset and has been given a second It is compared with the set temperature Ts2 (ST3).
(ST3)でTcmp >Ts2になると、つぎに圧縮機温度Tcmp と設定温度Toff とが比較(ST4)され、Tcm Becomes a Tcmp> Ts2 in (ST3), the compressor temperature Tcmp and the set temperature Toff is compared (ST4) Next, Tcm
p >Toff であれば冷媒不足と判断して圧縮機の動作を停止(ST6)するが、Tcmp >Toff でなければ、前記室内熱交換器温度Trcと設定温度Ts3とが比較(ST Stopping the operation of, if p> Toff is determined that the refrigerant shortage compressor (ST6) Suruga, Tcmp> Toff Otherwise, the indoor heat exchanger temperature Trc and the set temperature Ts3 is compared (ST
5)される。 5) by the. (ST5)でTrc<Ts3でなければ(ST (ST5) in Trc <Ts3 unless (ST
3)に戻るが、Trc<Ts3であれば冷媒不足と判断して圧縮機の動作を停止(ST6)するようにしている。 Back to 3), but the operation of determining a refrigerant shortage when the Trc <Ts3 compressor to stop (ST6).

【0009】つぎに、図3の実施例について説明する。 [0009] Next, a description will be given of an embodiment of FIG.
本実施例の場合図2の実施例の(ST3)までは同じであり、説明を省略する。 Up (ST3) of the embodiment in Figure 2 of the present embodiment is the same, the description thereof is omitted. (ST3)でTcmp >Ts2になると、つぎに圧縮機温度Tcmp と室内熱交換器温度Trc Becomes a Tcmp> Ts2 in (ST3), then the compressor temperature Tcmp and the indoor heat exchanger temperature Trc
との差が、冷媒不足を示す所定の温度差ΔToff 以上であるか比較(ST7)され、Tcmp −Trc>ΔToff であれば直ちに圧縮機1の動作を停止(SDT6)し、T Difference between is compared whether the predetermined temperature difference DerutaToff above showing a refrigerant shortage (ST7), immediately operation of the compressor 1 if Tcmp -Trc> ΔToff stop (SDT6), T
cmp −Trc>ΔToff でなければ、圧縮機温度Tcmp と圧縮機の設定温度Toff とが比較(ST8)され、Tcm Otherwise cmp -Trc> ΔToff, the set temperature Toff of the compressor temperature Tcmp the compressor are compared (ST8), Tcm
p >Toff であれば冷媒不足と判断して圧縮機の動作を停止(ST6)するが、Tcmp >Toff でなければ前記(ST3)に戻るようにしている。 If p> Toff is determined that the refrigerant shortage stopping the operation of the compressor (ST6) Suruga, have to return to Tcmp> Toff unless the (ST3).

【0010】 [0010]

【発明の効果】以上説明したように、本発明による空気調和機の制御方法によれば、圧縮機の設定温度より低い第2の設定温度と、前記室内熱交換器の設定温度とを設けると共に、前記室内熱交換器の中間温度を検出し、暖房運転開始してから所定時間経過後、前記圧縮機の温度が第2の設定温度を超え、なお且つ前記室内熱交換器の中間温度が設定温度より低い場合に冷媒不足と判断して圧縮機の動作を停止するようにしたので、外気温度が低い場合等に、圧縮機の温度が圧縮機の許容最大温度である設定温度を超える前の早期に冷媒不足を判断でき、圧縮機の破損を確実に防止することができる。 As described in the foregoing, according to the control method of the air conditioner according to the present invention, first and second set temperature lower than the set temperature of the compressor, provided with a set temperature of the indoor heat exchanger , to detect the intermediate temperature of the indoor heat exchanger, after a predetermined time has elapsed from the start of heating operation, the temperature of the compressor exceeds a second predetermined temperature, Note and intermediate temperature of the indoor heat exchanger set since so as to stop the operation of the compressor is determined that the refrigerant shortage is lower than the temperature, such as when the outside air temperature is low, before the temperature of the compressor exceeds a preset temperature is the maximum permissible temperature of the compressor early can determine refrigerant shortage, breakage of the compressor can be reliably prevented.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明による制御方法を適用する空気調和機の一実施例を示すブロック図である。 1 is a block diagram showing an embodiment of an air conditioner applying the control method according to the present invention.

【図2】本発明による空気調和機の制御方法の一実施例を示すフローチャート図である。 2 is a flow chart showing one embodiment of a control method of an air conditioner according to the present invention.

【図3】本発明による空気調和機の制御方法の他の実施例を示すフローチャート図である。 Is a flow chart diagram illustrating another embodiment of the control method of an air conditioner according to the present invention; FIG.

【図4】従来の空気調和機の制御方法を示すフローチャート図である。 4 is a flowchart showing a control method of a conventional air conditioner.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 圧縮機 2 四方弁 3 室外熱交換器 4 室内熱交換器 5 絞り機構 6 圧縮機温度センサ 7 室内熱交換器温度センサ 8 室外制御部 9 室内制御部 1 compressor 2 four-way valve 3 outdoor heat exchanger 4 the indoor heat exchanger 5 throttle mechanism 6 compressor temperature sensor 7 the indoor heat exchanger temperature sensor 8 outdoor control unit 9 indoor control unit

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 圧縮機、室内熱交換器、絞り機構、室外熱交換器を順次循環する冷凍サイクルを有し、冷房運転および暖房運転を可能とした空気調和機における暖房運転開始してから所定時間経過後、圧縮機のケースまたは吐出口の温度を検出し、同圧縮機の温度が設定温度を超えた場合に冷媒不足と判断し、圧縮機の動作を停止して保護するようにしてなる空気調和機の制御方法において、前記圧縮機の設定温度より低い第2の設定温度を設定すると共に、前記室内熱交換器の中間温度を検出し、 1. A compressor, an indoor heat exchanger, throttle mechanism has a refrigeration cycle that sequentially circulate the outdoor heat exchanger, predetermined from the start the heating operation in the cooling operation and possible heating operation and air conditioner after time, detects the temperature of the case or the discharge port of the compressor, it is determined that the refrigerant shortage when the temperature of the compressor exceeds a preset temperature, made so as to protect and stop the operation of the compressor the control method of the air conditioner, and sets the second set temperature lower than the set temperature of the compressor to detect the intermediate temperature of the indoor heat exchanger,
    暖房運転開始してから所定時間経過後、前記圧縮機の温度が第2の設定温度を超え、なお且つ前記室内熱交換器の中間温度が設定温度より低い場合に冷媒不足と判断して圧縮機の動作を停止するようにしたことを特徴とする空気調和機の制御方法。 After a predetermined time from the start of heating operation, the temperature of the compressor exceeds a second predetermined temperature, Note and compressor intermediate temperature of the indoor heat exchanger is determined to refrigerant shortage is lower than the set temperature control method of an air conditioner which is characterized in that so as to stop the operation.
  2. 【請求項2】 暖房運転開始してから所定時間経過後、 Wherein after a predetermined time has elapsed from the start of heating operation,
    前記圧縮機の温度が前記第2の設定温度を超え、且つ同圧縮機の温度と前記室内熱交換器の中間温度との差が所定温度差以上となった場合に冷媒不足と判断して圧縮機の動作を停止するようにしたことを特徴とする請求項1 Compressing the temperature of the compressor exceeds the second predetermined temperature, and by the difference between the intermediate temperature of the indoor heat exchanger and the temperature of the compressor is determined to refrigerant shortage when it becomes equal to or higher than a predetermined temperature difference claim, characterized in that so as to stop the operation of the machine 1
    記載の空気調和機の制御方法。 Control method of an air conditioner according.
JP10330426A 1998-11-20 1998-11-20 Control method of air conditioner Pending JP2000154954A (en)

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US7419192B2 (en) 2005-07-13 2008-09-02 Carrier Corporation Braze-free connector utilizing a sealant coated ferrule
US7472557B2 (en) 2004-12-27 2009-01-06 Carrier Corporation Automatic refrigerant charging apparatus
US7552596B2 (en) 2004-12-27 2009-06-30 Carrier Corporation Dual thermochromic liquid crystal temperature sensing for refrigerant charge indication
JP2009222247A (en) * 2008-03-13 2009-10-01 Aisin Seiki Co Ltd Air conditioner and its control method
US7712319B2 (en) 2004-12-27 2010-05-11 Carrier Corporation Refrigerant charge adequacy gauge
US8290722B2 (en) 2006-12-20 2012-10-16 Carrier Corporation Method for determining refrigerant charge
WO2014068819A1 (en) * 2012-10-31 2014-05-08 ダイキン工業株式会社 Air conditioner
US9568226B2 (en) 2006-12-20 2017-02-14 Carrier Corporation Refrigerant charge indication
US9759465B2 (en) 2011-12-27 2017-09-12 Carrier Corporation Air conditioner self-charging and charge monitoring system

Cited By (10)

* Cited by examiner, † Cited by third party
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US7472557B2 (en) 2004-12-27 2009-01-06 Carrier Corporation Automatic refrigerant charging apparatus
US7552596B2 (en) 2004-12-27 2009-06-30 Carrier Corporation Dual thermochromic liquid crystal temperature sensing for refrigerant charge indication
US7712319B2 (en) 2004-12-27 2010-05-11 Carrier Corporation Refrigerant charge adequacy gauge
US7419192B2 (en) 2005-07-13 2008-09-02 Carrier Corporation Braze-free connector utilizing a sealant coated ferrule
US8290722B2 (en) 2006-12-20 2012-10-16 Carrier Corporation Method for determining refrigerant charge
US9568226B2 (en) 2006-12-20 2017-02-14 Carrier Corporation Refrigerant charge indication
JP2009222247A (en) * 2008-03-13 2009-10-01 Aisin Seiki Co Ltd Air conditioner and its control method
US9759465B2 (en) 2011-12-27 2017-09-12 Carrier Corporation Air conditioner self-charging and charge monitoring system
WO2014068819A1 (en) * 2012-10-31 2014-05-08 ダイキン工業株式会社 Air conditioner
JP2014089007A (en) * 2012-10-31 2014-05-15 Daikin Ind Ltd Air conditioner

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