JP3611257B2 - Heat pump air conditioner - Google Patents

Heat pump air conditioner Download PDF

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Publication number
JP3611257B2
JP3611257B2 JP09311295A JP9311295A JP3611257B2 JP 3611257 B2 JP3611257 B2 JP 3611257B2 JP 09311295 A JP09311295 A JP 09311295A JP 9311295 A JP9311295 A JP 9311295A JP 3611257 B2 JP3611257 B2 JP 3611257B2
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Japan
Prior art keywords
heat exchanger
temperature
defrosting
indoor heat
temperature difference
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JP09311295A
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Japanese (ja)
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JPH08261541A (en
Inventor
敦 岡田
喜啓 伊藤
康雄 片山
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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【０００１】
【産業上の利用分野】
本発明はヒートポンプ式空気調和機に関する。
【０００２】
【従来の技術】
従来のヒートポンプ式空気調和機の暖房運転時、室外熱交換器への着霜によって室内熱交換器に吸い込まれる室内空気の吸込空気温度と室内熱交換器から吹き出される室内空気の吹出空気温度との温度差が所定値に低下した時点で除霜運転を開始し室外熱交換器に高温のガス冷媒、即ち、ホットガスを導入していた。そして、室外熱交換器の温度を室外熱交温度センサで検知し、これが所定値以上に上昇したとき除霜運転を終了していた。
【０００３】
【発明が解決しようとする課題】
上記従来の空気調和機においては、室内熱交換器から吹き出される室内空気の吹出温度を検知するための吹出空気温度センサ及び室外熱交換器の温度を検知するための室外熱交温度センサを要するので、そのコストが嵩むという問題があった。
【０００４】
また、吹出空気温度は吹出口に配設された風向板の揺動に応じて変動するので、除霜運転の開始時期が不安定となるという問題があった。
【０００５】
【課題を解決するための手段】
本発明は上記課題を解決するために発明されたものであって、その要旨とするところは、圧縮機、四方弁、室外熱交換器、絞り機構、室内熱交換器等からなるヒートポンプサイクルを具備し、暖房運転時、上記室外熱交換器への着霜を感知したときこの室外熱交換器にホットガスを導入して除霜するヒートポンプ式空気調和機において、上記室内熱交換器に吸込まれる室内空気の温度を検出する吸込空気温度センサと、上記室内熱交換器の温度を検出する室内熱交温度センサと、上記両センサの検出する温度の温度差を検出する温度差検出手段と、上記温度差の変化により室外熱交換器への着霜を感知してデフロスト運転開始指令を出力するデフロスト指令手段と、暖房運転を開始してから除霜運転を経て再び暖房運転に入るまでの１サイクル中における上記両センサの温度差が最大となる無霜時の最大温度差を記憶する最大温度差記憶手段と、を設け、上記デフロスト指令手段は、上記最大温度差に対し上記温度差検出手段が検出した温度差が所定割合まで低下したとき、デフロスト運転開始指令を出力することを特徴とするヒートポンプ式空気調和機にある。
【０００６】
他の特徴とするところは、除霜運転中に上記室内熱交温度センサの検出温度が設定温度になったとき、除霜運転を終了させるデフロスト終了手段を具備することにある。
【０００７】
更に、他の特徴とするところは、圧縮機、四方弁、室外熱交換器、絞り機構、室内熱交換器等からなるヒートポンプサイクルを具備し、暖房運転時、上記室外熱交換器への着霜を感知したときこの室外熱交換器にホットガスを導入して除霜するヒートポンプ式空気調和機において、上記室内熱交換器に吸込まれる室内空気の温度を検出する吸込空気温度センサと、上記室内熱交換器の温度を検出する室内熱交温度センサと、上記両センサの検出する温度の温度差を検出する温度差検出手段と、上記温度差の変化により室外熱交換器への着霜を感知してデフロスト運転開始指令を出力するデフロスト指令手段とを設け、除霜運転中に上記室内熱交温度センサの検出温度が設定温度になったとき、除霜運転を終了させるデフロスト終了手段を具備することにある。
【０００８】
更に、他の特徴とするところは、除霜時間を設定する手段と、この設定時間を室内熱交換器用フアンのオン・オフあるいは変速及び除霜運転直前の上記室内熱交温度センサの検出温度によって変更する除霜時間変更手段と、変更された除霜時間が経過したとき除霜運転を終了させるデフロスト終了手段を具備することにある。
【０００９】
【作用】
本発明においては、吸込空気温度センサにより検出された室内熱交換器に吸込まれる室内空気の温度と室内熱交温度センサにより検出された室内熱交換器の温度との温度差により室外熱交換器への着霜を感知したとき、デフロスト指令手段はデフロスト指令を出力し、これによって除霜運転が開始されて室外熱交換器にホットガスが導入される。
【００１０】
上記温度差が暖房運転を開始してから除霜運転を経て再び暖房運転に入るまでの１サイクル中の最大温度差に対し所定割合まで低下したとき、デフロスト指令を出力して除霜運転を開始することができる。
【００１１】
除霜運転中に室内熱交温度センサの検出温度が設定温度になったとき、除霜運転を終了することができる。
【００１２】
予め設定された除霜時間を室内熱交換器用フアンのオン・オフあるいは変速及び除霜運転直前の室内熱交温度センサの検出温度によって変更し、変更された除霜時間が経過したとき除霜運転を終了させることができる。
【００１３】
【実施例】
本発明の第１の実施例が図１に示されている。
冷房運転時、圧縮機２から吐出されたガス冷媒は実線矢印で示すように、四方弁３を経て室外熱交換器４に入り、ここで室外フアン７により送られる外気に放熱することによって凝縮液化する。
【００１４】
この液冷媒は絞り機構５を流過する過程で断熱膨張した後、室内熱交換器６に入り、ここで室内フアン８により送られる室内空気を冷却することによって蒸発気化する。しかる後、このガス冷媒は四方弁３を経て圧縮機２に戻る。
【００１５】
暖房運転時には、圧縮機２から吐出された冷媒は破線矢印で示すように、四方弁３、室内熱交換器６、絞り機構５、室外熱交換器４、四方弁３をこの順に経て圧縮機２に戻る。
【００１６】
室内熱交換器６に吸込まれる室内空気の温度を検出する吸込空気温度センサ１０及び室内熱交換器６の温度を検出する室内熱交温度センサ１１の検出温度はコントローラ２０の温度差検出手段２１に入力され、ここで両者の温度差が検出される。
【００１７】
この温度差は最大温度差記憶手段２２に入力されて、ここで暖房運転を開始してから除霜運転を経て暖房運転に復帰するまでの１サイクル中の最大温度差が記憶される。
なお、温度差は図２に示すように、上記１サイクル中に変化し、無霜時の最大温度差Ｂが記憶される。
【００１８】
一方、温度差はデフロスト指令手段２３に入力され、ここで最大温度差Ｂと比較される。この温度差は暖房運転を継続することにより室外熱交換器４に霜が蓄積されるのに従って次第に減少するので、これが最大温度差Ｂに対して所定の割合（例えば、８５％）の温度差Ａに到達したとき、デフロスト指令手段２３はデフロスト指令を出力手段２４を介して四方弁３、室外フアン７の駆動モータ１２、室内フアン８の駆動モータ１３に出力して四方弁３を冷房運転時の状態に切り換え、かつ、室外フアン７及び室内フアン８を停止する。
【００１９】
これによって除霜運転が開始され、冷媒は冷房運転時と同様実線矢印で示すようにヒートポンプサイクルを循環し、圧縮機２から吐出された高温の冷媒ガス、即ち、ホットガスが四方弁３を経て室外熱交換器４に入り、この表面に付着している霜を溶融除去する。
【００２０】
室内熱交温度センサ１１の検出温度はデフロスト終了手段２６に入力され、ここで設定手段２５から入力された設定温度と比較される。除霜運転によって室内熱交温度センサ１１の検出温度が設定温度になったとき、デフロスト終了手段２６はデフロスト終了を決定し、この決定は出力手段２４を介して四方弁３、室外フアン７の駆動モータ１２、室内フアン８の駆動モータ１３に出力される。
これによって、四方弁３は暖房運転時の状態に切り換えられ、かつ、室外フアン７及び室内フアン８が運転を開始して暖房運転に復帰する。
【００２１】
本発明の第２の実施例が図３に示されている。この第２の実施例においては、コントローラ３０は除霜時間を設定するための除霜時間設定手段２７と除霜時間変更手段２８を具備している。しかして、デフロスト指令手段２３から出力されたデフロスト指令が除霜時間設定手段２７に入力されると、ここに予め設定された除霜時間は除霜時間変更手段２８に入力される。そして、これに入力された室内フアンモータ１３のＯＮ、ＯＦＦ又はその変速、除霜運転直前の室内熱交温度センサ１１の検出温度に応じて複数（例えば、３分、４分、７分等）に変更される。
【００２２】
変更された除霜時間が経過して、この旨がデフロスト終了手段２９に入力されたとき、デフロスト終了手段２９はデフロスト終了を決定し、この決定は出力手段２４を介して四方弁３、室外フアン７の駆動モータ１２、室内フアン８の駆動モータ１３に出力して四方弁３を暖房運転状態に切り換え、かつ、室外フアン７及び室内フアン８を運転する。
【００２３】
かくして、除霜時間を室内フアン８のＯＮ、ＯＦＦ 又はその変速、除霜運転直前の室内熱交換器６の温度に応じて変更することによって無駄な除霜運転をすることなく必要最小限の除霜運転によって室外熱交換器４ に付着した霜を溶融除去しうる。
【００２４】
【発明の効果】
本発明においては、吸込空気温度センサの検出温度と殆ど全てのヒートポンプ式空気調和機に設けられている既設の室内熱交温度センサの検出温度との温度との温度差により室外熱交換器への着霜を感知してデフロスト指令手段を出力するので、従来のように吹出空気温度センサを要しない。
従って、吹出空気温度センサのコストを節減できるとともに風向板の揺動による影響を受けないので、正確にデフロスト指令に出力することができる。
【００２５】
除霜運転中に室内熱交温度センサの検出温度が設定温度になったとき、デフロスト終了指令を出力するようにすれば、室外熱交換器の温度を検出するための室外熱交換温度センサを省略できるので、このコストを節減できる。
【００２６】
予め設定された除霜時間を室内熱交換器用フアンのオン・オフあるいは変速及び除霜運転直前の室内熱交温度センサの検出温度によって変更すれば、必要最小限の除霜時間によって室外熱交換器に付着した霜を確実に溶融除去できる。
【図面の簡単な説明】
【図１】本発明の第１の実施例を示す系統図である。
【図２】上記実施例における温度差の経時変化を示す線図である。
【図３】本発明の第２の実施例を示す系統図である。
【符号の説明】
２ 圧縮機
４ 室外熱交換器
５ 絞り機構
６ 室内熱交換器
１０ 吸込空気温度センサ
１１ 室内熱交温度センサ
２０ コントローラ[0001]
[Industrial application fields]
The present invention relates to a heat pump type air conditioner.
[0002]
[Prior art]
During the heating operation of a conventional heat pump air conditioner, the intake air temperature of the indoor air sucked into the indoor heat exchanger due to frost formation on the outdoor heat exchanger and the blown air temperature of the indoor air blown out from the indoor heat exchanger The defrosting operation was started at the time when the temperature difference dropped to a predetermined value, and a high-temperature gas refrigerant, that is, hot gas was introduced into the outdoor heat exchanger. And the temperature of the outdoor heat exchanger was detected by the outdoor heat exchanger temperature sensor, and when this increased above a predetermined value, the defrosting operation was finished.
[0003]
[Problems to be solved by the invention]
The conventional air conditioner requires a blown air temperature sensor for detecting the blown temperature of indoor air blown from the indoor heat exchanger and an outdoor heat exchanger temperature sensor for detecting the temperature of the outdoor heat exchanger. Therefore, there was a problem that the cost increased.
[0004]
In addition, since the temperature of the blown air fluctuates according to the swing of the wind direction plate disposed at the blower outlet, there is a problem that the start time of the defrosting operation becomes unstable.
[0005]
[Means for Solving the Problems]
The present invention has been invented to solve the above-mentioned problems, and the gist of the present invention is that it comprises a heat pump cycle comprising a compressor, a four-way valve, an outdoor heat exchanger, a throttle mechanism, an indoor heat exchanger, and the like. In a heat pump type air conditioner that defrosts by introducing hot gas into the outdoor heat exchanger when frost formation on the outdoor heat exchanger is detected during heating operation, the air is sucked into the indoor heat exchanger a suction air temperature sensor for detecting the temperature of indoor air, and the indoor heat exchanger temperature sensor for detecting the temperature of the indoor heat exchanger, and the temperature difference detecting means for detecting a temperature difference between the temperature detected in the two sensors, the a defrosting command means for outputting a defrosting operation start command by sensing frost on the outdoor heat exchanger by a change in temperature difference, one cycle from the start of heating operation to enter a heating operation again after the defrosting operation A maximum temperature difference storage means for storing a maximum temperature difference at the time of no frost in which the temperature difference between the two sensors is maximum, and the defrost command means has the temperature difference detection means for the maximum temperature difference. The heat pump type air conditioner outputs a defrost operation start command when the detected temperature difference decreases to a predetermined rate .
[0006]
Another feature is that a defrosting end unit is provided to end the defrosting operation when the temperature detected by the indoor heat exchange temperature sensor reaches a set temperature during the defrosting operation .
[0007]
Furthermore, another feature is that a heat pump cycle including a compressor, a four-way valve, an outdoor heat exchanger, a throttle mechanism, an indoor heat exchanger, and the like is provided, and frost formation on the outdoor heat exchanger is performed during heating operation. In a heat pump air conditioner that defrosts by introducing hot gas into the outdoor heat exchanger when it senses the intake air temperature sensor that detects the temperature of the indoor air sucked into the indoor heat exchanger, and the indoor An indoor heat exchanger temperature sensor for detecting the temperature of the heat exchanger, a temperature difference detecting means for detecting a temperature difference between the temperatures detected by the two sensors, and detecting frost formation on the outdoor heat exchanger by the change in the temperature difference. and it provided the defrosting command means for outputting a defrosting operation start command and, when the detected temperature of the indoor heat exchange temperature sensor reaches the set temperature during the defrosting operation, including a defrost termination means for terminating the defrosting operation In the Rukoto.
[0008]
Further, another feature is that the defrosting time is set, and this set time is determined by the detected temperature of the indoor heat exchanger temperature sensor immediately before or after the indoor heat exchanger fan is turned on or off, or immediately before shifting and defrosting operations. A defrosting time changing means for changing and a defrosting ending means for ending the defrosting operation when the changed defrosting time elapses are provided.
[0009]
[Action]
In the present invention, the outdoor heat exchanger is determined by the temperature difference between the temperature of the indoor air sucked into the indoor heat exchanger detected by the intake air temperature sensor and the temperature of the indoor heat exchanger detected by the indoor heat exchanger temperature sensor. When defrosting is detected, the defrost command means outputs a defrost command, thereby starting the defrosting operation and introducing hot gas into the outdoor heat exchanger.
[0010]
When the temperature difference is reduced to a predetermined ratio with respect to the maximum temperature difference in one cycle from the start of heating operation to the start of heating operation after defrosting operation, a defrost command is output and defrosting operation is started. can do.
[0011]
When the temperature detected by the indoor heat exchanger temperature sensor reaches the set temperature during the defrosting operation, the defrosting operation can be terminated.
[0012]
The defrosting time set in advance is changed according to the temperature detected by the indoor heat exchanger temperature sensor immediately before or after the fan for the indoor heat exchanger or the speed change and the defrosting operation. Can be terminated.
[0013]
【Example】
A first embodiment of the present invention is shown in FIG.
During the cooling operation, the gas refrigerant discharged from the compressor 2 enters the outdoor heat exchanger 4 through the four-way valve 3 as indicated by a solid arrow, and condenses and liquefies by releasing heat to the outside air sent by the outdoor fan 7 here. To do.
[0014]
This liquid refrigerant adiabatically expands in the process of flowing through the throttle mechanism 5 and then enters the indoor heat exchanger 6 where it evaporates and evaporates by cooling the indoor air sent by the indoor fan 8. Thereafter, the gas refrigerant returns to the compressor 2 through the four-way valve 3.
[0015]
During the heating operation, the refrigerant discharged from the compressor 2 passes through the four-way valve 3, the indoor heat exchanger 6, the throttle mechanism 5, the outdoor heat exchanger 4, and the four-way valve 3 in this order, as indicated by broken line arrows. Return to.
[0016]
The detected temperature of the intake air temperature sensor 10 for detecting the temperature of the indoor air sucked into the indoor heat exchanger 6 and the temperature of the indoor heat exchanger temperature sensor 11 for detecting the temperature of the indoor heat exchanger 6 are the temperature difference detecting means 21 of the controller 20. Where the temperature difference between the two is detected.
[0017]
This temperature difference is input to the maximum temperature difference storage means 22, where the maximum temperature difference in one cycle from the start of the heating operation to the return to the heating operation through the defrosting operation is stored.
In addition, as shown in FIG. 2, a temperature difference changes during the said 1 cycle, and the maximum temperature difference B at the time of no frost is memorize | stored.
[0018]
On the other hand, the temperature difference is input to the defrost command means 23 where it is compared with the maximum temperature difference B. Since this temperature difference gradually decreases as frost accumulates in the outdoor heat exchanger 4 by continuing the heating operation, this temperature difference A is a predetermined ratio (for example, 85%) with respect to the maximum temperature difference B. The defrost command means 23 outputs the defrost command to the four-way valve 3, the drive motor 12 for the outdoor fan 7, and the drive motor 13 for the indoor fan 8 via the output means 24 to output the defrost command to the four-way valve 3 during the cooling operation. The state is switched to the state, and the outdoor fan 7 and the indoor fan 8 are stopped.
[0019]
As a result, the defrosting operation is started, and the refrigerant circulates in the heat pump cycle as indicated by the solid line arrow as in the cooling operation, and the high-temperature refrigerant gas discharged from the compressor 2, that is, hot gas passes through the four-way valve 3. It enters the outdoor heat exchanger 4 and melts and removes frost adhering to this surface.
[0020]
The temperature detected by the indoor heat exchanger temperature sensor 11 is input to the defrosting end unit 26, where it is compared with the set temperature input from the setting unit 25. When the temperature detected by the indoor heat exchanger temperature sensor 11 reaches the set temperature by the defrosting operation, the defrosting end means 26 determines the end of the defrosting, and this determination is made by driving the four-way valve 3 and the outdoor fan 7 via the output means 24. It is output to the motor 12 and the drive motor 13 of the indoor fan 8.
Thereby, the four-way valve 3 is switched to the state during the heating operation, and the outdoor fan 7 and the indoor fan 8 start to operate and return to the heating operation.
[0021]
A second embodiment of the present invention is shown in FIG. In the second embodiment, the controller 30 includes a defrosting time setting unit 27 and a defrosting time changing unit 28 for setting the defrosting time. Thus, when the defrost command output from the defrost command means 23 is input to the defrost time setting means 27, the defrost time preset here is input to the defrost time changing means 28. Then, ON in chamber fan motor 13 that is input thereto, OFF or the shifting, the plurality in accordance with the detected temperature of the defrosting operation just before the indoor heat exchanger temperature sensor 11 (e.g., 3 minutes, 4 minutes, 7 minutes, etc. ).
[0022]
When the changed defrosting time has elapsed and this is input to the defrost end means 29, the defrost end means 29 determines the end of the defrost, and this determination is made via the output means 24 via the four-way valve 3 and the outdoor fan. 7 to the drive motor 12 of the indoor fan 8, and the four-way valve 3 is switched to the heating operation state, and the outdoor fan 7 and the indoor fan 8 are operated.
[0023]
Thus, the defrosting time is changed according to the temperature of the indoor heat exchanger 6 immediately before the defrosting operation by turning on / off the indoor fan 8 or changing its speed, and the minimum necessary defrosting operation is performed without performing the defrosting operation. The frost adhering to the outdoor heat exchanger 4 can be melted and removed by the frost operation.
[0024]
【The invention's effect】
In the present invention, the temperature difference between the detected temperature of the intake air temperature sensor and the detected temperature of the existing indoor heat exchanger temperature sensor provided in almost all heat pump air conditioners is changed to the outdoor heat exchanger. Since frost formation is detected and the defrost command means is output, a blown air temperature sensor is not required as in the prior art.
Therefore, the cost of the blown air temperature sensor can be reduced and it is not affected by the swing of the wind direction plate, so that the defrost command can be output accurately.
[0025]
If the defrost end command is output when the detected temperature of the indoor heat exchange temperature sensor reaches the set temperature during the defrosting operation, the outdoor heat exchange temperature sensor for detecting the temperature of the outdoor heat exchanger is omitted. This cost can be saved.
[0026]
If the preset defrosting time is changed according to the detected temperature of the indoor heat exchanger temperature sensor immediately before the fan for indoor heat exchanger is turned on or off, or the speed change and defrosting operation, the outdoor heat exchanger is reduced with the minimum defrosting time. It is possible to reliably melt and remove frost adhering to the surface.
[Brief description of the drawings]
FIG. 1 is a system diagram showing a first embodiment of the present invention.
FIG. 2 is a diagram showing the change over time of the temperature difference in the example.
FIG. 3 is a system diagram showing a second embodiment of the present invention.
[Explanation of symbols]
2 Compressor 4 Outdoor heat exchanger 5 Throttle mechanism 6 Indoor heat exchanger 10 Suction air temperature sensor 11 Indoor heat exchange temperature sensor 20 Controller

Claims (4)

圧縮機、四方弁、室外熱交換器、絞り機構、室内熱交換器等からなるヒートポンプサイクルを具備し、暖房運転時、上記室外熱交換器への着霜を感知したときこの室外熱交換器にホットガスを導入して除霜するヒートポンプ式空気調和機において、上記室内熱交換器に吸込まれる室内空気の温度を検出する吸込空気温度センサと、上記室内熱交換器の温度を検出する室内熱交温度センサと、上記両センサの検出する温度の温度差を検出する温度差検出手段と、上記温度差の変化により室外熱交換器への着霜を感知してデフロスト運転開始指令を出力するデフロスト指令手段と、暖房運転を開始してから除霜運転を経て再び暖房運転に入るまでの１サイクル中における上記両センサの温度差が最大となる無霜時の最大温度差を記憶する最大温度差記憶手段と、を設け、上記デフロスト指令手段は、上記最大温度差に対し上記温度差検出手段が検出した温度差が所定割合まで低下したとき、デフロスト運転開始指令を出力することを特徴とするヒートポンプ式空気調和機。It has a heat pump cycle consisting of a compressor, four-way valve, outdoor heat exchanger, throttle mechanism, indoor heat exchanger, etc., and when it detects frost formation on the outdoor heat exchanger during heating operation, this outdoor heat exchanger In a heat pump air conditioner that defrosts by introducing hot gas, an intake air temperature sensor that detects the temperature of indoor air that is sucked into the indoor heat exchanger, and indoor heat that detects the temperature of the indoor heat exchanger and exchange temperature sensor, defrost for outputting a temperature difference detecting means for detecting a temperature difference between the temperature detected in the two sensors, the defrost operation start command by sensing frost on the outdoor heat exchanger by a change in the temperature difference maximum temperature for storing and command means, the maximum temperature difference at the time of non-frost temperature difference of the two sensors during one cycle from the start of heating operation to enter a heating operation again after the defrosting operation is maximum Storage means, the provided, the defrosting command means, when the temperature difference detected by said temperature difference detection means to the maximum temperature difference has decreased to a predetermined ratio, and outputs a defrosting operation start command pump Type air conditioner. 除霜運転中に上記室内熱交温度センサの検出温度が設定温度になったとき、除霜運転を終了させるデフロスト終了手段を具備することを特徴とする請求項１記載のヒートポンプ式空気調和機。The heat pump type air conditioner according to claim 1 , further comprising a defrost ending means for ending the defrosting operation when the temperature detected by the indoor heat exchange temperature sensor reaches a set temperature during the defrosting operation . 圧縮機、四方弁、室外熱交換器、絞り機構、室内熱交換器等からなるヒートポンプサイクルを具備し、暖房運転時、上記室外熱交換器への着霜を感知したときこの室外熱交換器にホットガスを導入して除霜するヒートポンプ式空気調和機において、上記室内熱交換器に吸込まれる室内空気の温度を検出する吸込空気温度センサと、上記室内熱交換器の温度を検出する室内熱交温度センサと、上記両センサの検出する温度の温度差を検出する温度差検出手段と、上記温度差の変化により室外熱交換器への着霜を感知してデフロスト運転開始指令を出力するデフロスト指令手段とを設け、除霜運転中に上記室内熱交温度センサの検出温度が設定温度になったとき、除霜運転を終了させるデフロスト終了手段を具備することを特徴とするヒートポンプ式空気調和機。 It has a heat pump cycle consisting of a compressor, four-way valve, outdoor heat exchanger, throttle mechanism, indoor heat exchanger, etc., and when it detects frost formation on the outdoor heat exchanger during heating operation, this outdoor heat exchanger In a heat pump air conditioner that defrosts by introducing hot gas, an intake air temperature sensor that detects the temperature of indoor air that is sucked into the indoor heat exchanger, and indoor heat that detects the temperature of the indoor heat exchanger An alternating temperature sensor, a temperature difference detecting means for detecting a temperature difference between the temperatures detected by the two sensors, and a defrost that outputs a defrost operation start command by sensing frost formation on the outdoor heat exchanger due to a change in the temperature difference. and command means provided, dividing when frost during operation detecting temperature of the indoor heat exchange temperature sensor reaches the set temperature, features and to Ruhi Topon by comprising defrost termination means for terminating the defrosting operation Expression air conditioner. 除霜時間を設定する手段と、この設定時間を室内熱交換器用ファンのオン・オフあるいは変速及び除霜運転直前の上記室内熱交温度センサの検出温度によって変更する除霜時間変更手段と、変更された除霜時間が経過したとき除霜運転を終了させるデフロスト終了手段を具備することを特徴とする請求項１記載のヒートポンプ式空気調和機。Means for setting a defrosting time, defrosting time changing means for changing the set time according to the detected temperature of the indoor heat exchanger temperature sensor immediately before turning on / off or shifting and defrosting the indoor heat exchanger fan, and changing The heat pump type air conditioner according to claim 1, further comprising a defrosting end unit that ends the defrosting operation when the defrosting time that has been performed has elapsed.
JP09311295A 1995-03-27 1995-03-27 Heat pump air conditioner Expired - Lifetime JP3611257B2 (en)

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