JP2909963B2 - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JP2909963B2 JP2909963B2 JP8251507A JP25150796A JP2909963B2 JP 2909963 B2 JP2909963 B2 JP 2909963B2 JP 8251507 A JP8251507 A JP 8251507A JP 25150796 A JP25150796 A JP 25150796A JP 2909963 B2 JP2909963 B2 JP 2909963B2
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- compressor
- outdoor heat
- stop time
- temperature
- Prior art date
- 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.)
- Expired - Fee Related
Links
Landscapes
- Air Conditioning Control Device (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、デフロスト運転
を行う空気調和機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for performing a defrost operation.
【０００２】[0002]
【従来の技術】従来、空気調和機としては、暖房運転中
に室外熱交換器に霜が付着して、熱交換効率が低下した
場合、暖房サイクルから冷房サイクルに切り換えて、室
外熱交換器を除霜するデフロスト運転を行うものがあ
る。この空気調和機は、暖房サイクルを一旦停止し、四
路弁を切り換えて逆サイクルの冷房サイクルでデフロス
ト運転を開始するが、デフロスト運転の前に冷媒回路内
を均圧にするため、圧縮機を所定時間停止させて、運転
待機状態にする。次に、上記圧縮機を一定時間停止させ
た後、四路弁を切り換えて、圧縮機を起動し、デフロス
ト運転を行う。そして、そのデフロスト運転の終了から
圧縮機を所定時間停止させた後、四路弁を切り換えて、
正サイクルの暖房サイクルで暖房運転を再開する。2. Description of the Related Art Conventionally, an air conditioner switches from a heating cycle to a cooling cycle when frost adheres to an outdoor heat exchanger during a heating operation and the heat exchange efficiency is reduced. There is one that performs a defrost operation for defrosting. In this air conditioner, the heating cycle is temporarily stopped, the four-way valve is switched, and the defrost operation is started in the cooling cycle of the reverse cycle.However, in order to equalize the pressure in the refrigerant circuit before the defrost operation, the compressor is operated. The operation is stopped for a predetermined time and the operation is put into a standby state. Next, after stopping the compressor for a certain period of time, the four-way valve is switched, the compressor is started, and the defrost operation is performed. After stopping the compressor for a predetermined time from the end of the defrost operation, the four-way valve is switched,
The heating operation is restarted in the normal heating cycle.
【０００３】[0003]
【発明が解決しようとする課題】ところが、上記空気調
和機では、冷媒回路内の高圧側と低圧側との高低差圧に
よらず、圧縮機の停止時間が一定であるため、停止時間
が短いと、冷媒回路内が充分に均圧になる前に四路弁を
切り換えることによって、高低差圧により音が発生し
て、不快感を与える場合がある。また、上記圧縮機の停
止時間が長いため、冷媒回路内が均圧になっているにも
係わらず停止状態が続き、暖房運転の開始が遅れて、快
適性が損なわれるという欠点がある。However, in the above-mentioned air conditioner, the stop time of the compressor is fixed irrespective of the differential pressure between the high pressure side and the low pressure side in the refrigerant circuit, so that the stop time is short. By switching the four-way valve before the pressure in the refrigerant circuit is sufficiently equalized, a sound may be generated due to the high / low pressure difference, which may cause discomfort. Further, since the stop time of the compressor is long, the stop state continues despite the fact that the pressure in the refrigerant circuit is equalized, and the start of the heating operation is delayed, and the comfort is impaired.
【０００４】そこで、この発明の目的は、デフロスト運
転の開始／終了時に、四路弁等の切り換え時の音を低減
できると共に、停止時間を短縮して、快適性を向上でき
る空気調和機を提供することにある。Accordingly, an object of the present invention is to provide an air conditioner capable of reducing noise at the time of switching of a four-way valve or the like at the start / end of a defrost operation, shortening a stop time, and improving comfort. Is to do.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の空気調和機は、圧縮機,室外熱交換器,膨
張手段および室内熱交換器が環状に接続された冷媒回路
を備えて、上記室外熱交換器を除霜するデフロスト運転
を行う空気調和機において、暖房運転時に上記室外熱交
換器が着霜したか否かを判別する着霜判別手段と、上記
着霜判別手段が上記室外熱交換器が着霜したと判別する
と、上記室内熱交換器の温度と上記室外熱交換器の温度
との温度差の大小に基づいてデフロスト運転を行う前に
上記圧縮機を停止させている停止時間を長短に設定する
停止時間設定手段と、上記着霜判別手段が上記室外熱交
換器が着霜したと判別してから上記停止時間設定手段に
より設定された上記停止時間の間、上記圧縮機を停止さ
せる停止指令を出力する圧縮機停止指令手段とを備えた
ことを特徴としている。In order to achieve the above object, the air conditioner of the present invention comprises a refrigerant circuit in which a compressor, an outdoor heat exchanger, an expansion means and an indoor heat exchanger are connected in a ring. In the air conditioner performing a defrosting operation for defrosting the outdoor heat exchanger, the frosting determination unit that determines whether the outdoor heat exchanger has frosted during the heating operation, and the frosting determination unit includes: When it is determined that the outdoor heat exchanger has formed frost, the compressor is stopped before performing the defrost operation based on the temperature difference between the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger. The stop time setting means for setting the stop time to be long or short, and the frost determination means for the stop time set by the stop time setting means after the outdoor heat exchanger has determined that frost has formed, Outputs a stop command to stop the compressor It is characterized in that a that the compressor stop instruction means.
【０００６】上記請求項１の空気調和機によれば、暖房
運転中に、上記着霜判別手段が上記室外熱交換器が着霜
したと判別すると、上記停止時間設定手段は、室内熱交
換器の温度と室外熱交換器の温度との温度差の大小に基
づいてデフロスト運転を行う前に圧縮機を停止させてい
る停止時間を長短に設定する。すなわち、上記室内熱交
換器の温度と室外熱交換器の温度との温度差によって、
冷媒回路内の高圧側と低圧側との高低圧差を推定して、
デフロスト運転の開始前に冷媒回路内を充分に均圧でき
るように圧縮機の停止時間を設定するのである。次に、
上記圧縮機停止指令手段は、着霜判別手段が室外熱交換
器が着霜したと判別してから上記停止時間が経過するま
で停止指令を出力して、圧縮機を停止させる。そして、
上記圧縮機を停止させて、冷媒回路内を充分に均圧にし
た後、四路弁等の切り換えを行って、デフロスト運転を
開始する。したがって、デフロスト運転の開始時に四路
弁等の切り換え時の音を低減できる。また、デフロスト
運転の開始前の圧縮機の停止時間を適正化することによ
って、圧縮機の停止時間を短縮して、快適性を向上でき
る。According to the air conditioner of the first aspect, if the frost formation determining means determines that the outdoor heat exchanger has formed frost during the heating operation, the stop time setting means sets the indoor heat exchanger. Before and after the defrost operation, the stop time of stopping the compressor is set to be longer or shorter based on the magnitude of the temperature difference between the temperature of the outdoor heat exchanger and the temperature of the compressor. That is, by the temperature difference between the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger,
Estimating the high and low pressure difference between the high pressure side and the low pressure side in the refrigerant circuit,
Before the defrost operation is started, the stop time of the compressor is set so that the pressure inside the refrigerant circuit can be sufficiently equalized. next,
The compressor stop command means outputs a stop command until the stop time elapses after the frost formation determination means determines that the outdoor heat exchanger has formed frost, and stops the compressor. And
After stopping the compressor and sufficiently equalizing the pressure in the refrigerant circuit, the four-way valve and the like are switched to start the defrost operation. Therefore, the noise at the time of switching the four-way valve or the like at the start of the defrost operation can be reduced. In addition, by optimizing the stop time of the compressor before the start of the defrost operation, the stop time of the compressor can be reduced, and the comfort can be improved.
【０００７】また、請求項２の空気調和機は、圧縮機,
室外熱交換器,膨張手段および室内熱交換器が環状に接
続された冷媒回路を備えて、上記室外熱交換器を除霜す
るデフロスト運転を行う空気調和機において、上記室外
熱交換器の除霜が終了したか否かを判別する除霜終了判
別手段と、上記除霜終了判別手段が上記室外熱交換器の
除霜が終了したと判別すると、上記室外熱交換器の温度
と上記室内熱交換器の温度との温度差の大小に基づい
て、上記圧縮機を停止させている停止時間を長短に設定
する停止時間設定手段と、上記除霜終了判別手段が上記
室外熱交換器の除霜が終了したと判別してから上記停止
時間設定手段により設定された上記停止時間の間、上記
圧縮機を停止させる停止指令を出力する圧縮機停止指令
手段とを備えたことを特徴としている。[0007] The air conditioner according to claim 2 is a compressor,
An air conditioner that includes a refrigerant circuit in which an outdoor heat exchanger, an expansion means, and an indoor heat exchanger are connected in a ring shape and performs a defrost operation for defrosting the outdoor heat exchanger. When the defrost end determining means determines that defrosting of the outdoor heat exchanger has been completed, the temperature of the outdoor heat exchanger and the indoor heat exchange are determined. Based on the magnitude of the temperature difference from the temperature of the unit, the stop time setting means for setting the stop time during which the compressor is stopped to longer or shorter, and the defrost end determination means determines whether the defrost of the outdoor heat exchanger is performed. Compressor stop command means for outputting a stop command for stopping the compressor during the stop time set by the stop time setting means after it is determined that the operation has been completed.
【０００８】上記請求項２の空気調和機によれば、デフ
ロスト運転中に、上記除霜終了判別手段が上記室外熱交
換器の除霜が終了したと判別すると、上記停止時間設定
手段は、室外熱交換器の温度と室内熱交換器の温度との
温度差の大小に基づいて圧縮機を停止させている停止時
間を長短に設定する。すなわち、上記室外熱交換器の温
度と室内熱交換器の温度との温度差によって、冷媒回路
内の高圧側と低圧側との高低圧差を推定して、暖房運転
を開始する前に冷媒回路内を充分に均圧できるように圧
縮機の停止時間を設定するのである。次に、上記圧縮機
停止指令手段は、除霜終了判別手段が室外熱交換器の除
霜が終了したと判別してから上記停止時間が経過するま
で停止指令を出力して、圧縮機を停止させる。そして、
上記圧縮機を停止させて、冷媒回路内を充分に均圧にし
た後、四路弁等の切り換えを行って、圧縮機の運転を開
始して暖房運転を再開する。したがって、デフロスト運
転の終了時に四路弁等の切り換え時の音を低減できる。
また、デフロスト運転の終了後の圧縮機の停止時間を適
正化することによって、圧縮機の停止時間を短縮して、
快適性を向上できる。According to the air conditioner of the second aspect, if the defrosting end determining means determines that the defrosting of the outdoor heat exchanger is completed during the defrost operation, the stop time setting means sets the outdoor time. Based on the temperature difference between the temperature of the heat exchanger and the temperature of the indoor heat exchanger, the stop time for stopping the compressor is set to be longer or shorter. That is, the temperature difference between the temperature of the outdoor heat exchanger and the temperature of the indoor heat exchanger is used to estimate the high-low pressure difference between the high-pressure side and the low-pressure side in the refrigerant circuit. The stop time of the compressor is set so that the pressure can be sufficiently equalized. Next, the compressor stop command means outputs a stop command until the stop time elapses after the defrost end determination means determines that the defrost of the outdoor heat exchanger has ended, and stops the compressor. Let it. And
After stopping the compressor and sufficiently equalizing the pressure in the refrigerant circuit, the four-way valve and the like are switched to start the operation of the compressor and restart the heating operation. Therefore, the noise at the time of switching the four-way valve or the like at the end of the defrost operation can be reduced.
Also, by optimizing the stop time of the compressor after the end of the defrost operation, the stop time of the compressor is reduced,
Comfort can be improved.
【０００９】また、請求項３の空気調和機は、圧縮機,
室外熱交換器,膨張手段および室内熱交換器が環状に接
続された冷媒回路を備えて、上記室外熱交換器を除霜す
るデフロスト運転を行う空気調和機において、暖房運転
時に上記室外熱交換器が着霜したか否かを判別する着霜
判別手段と、上記着霜判別手段が上記室外熱交換器が着
霜したと判別すると、上記室内熱交換器の温度と上記室
外熱交換器の温度との温度差の大小に基づいてデフロス
ト運転を行う前に上記圧縮機を停止させている第１停止
時間を長短に設定する第１停止時間設定手段と、上記着
霜判別手段が上記室外熱交換器が着霜したと判別してか
ら上記第１停止時間設定手段により設定された上記第１
停止時間の間、上記圧縮機を停止させる停止指令を出力
する第１圧縮機停止指令手段と、上記室外熱交換器の除
霜が終了したか否かを判別する除霜終了判別手段と、上
記除霜終了判別手段が上記室外熱交換器の除霜が終了し
たと判別すると、上記室外熱交換器の温度と上記室内熱
交換器の温度との温度差の大小に基づいて上記圧縮機を
停止させている第２停止時間を長短に設定する第２停止
時間設定手段と、上記除霜終了判別手段が上記室外熱交
換器の除霜が終了したと判別してから上記第２停止時間
設定手段により設定された上記第２停止時間の間、上記
圧縮機を停止させる停止指令を出力する第２圧縮機停止
指令手段とを備えたことを特徴としている。The air conditioner according to claim 3 is a compressor,
An outdoor heat exchanger, an expansion unit and an indoor heat exchanger, comprising a refrigerant circuit connected in a ring, an air conditioner performing a defrost operation for defrosting the outdoor heat exchanger, wherein the outdoor heat exchanger during a heating operation Frost determination means for determining whether or not frost has formed, and when the frost determination means determines that the outdoor heat exchanger has formed frost, the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger First stop time setting means for setting the first stop time for stopping the compressor to be short or long before the defrost operation is performed based on the magnitude of the temperature difference between the outdoor heat exchange and the outdoor heat exchange. The first stop time set by the first stop time setting means after it is determined that the vessel has formed frost.
A first compressor stop command means for outputting a stop command for stopping the compressor during the stop time; a defrost end determining means for determining whether or not defrosting of the outdoor heat exchanger is completed; When the defrost end determining means determines that defrosting of the outdoor heat exchanger is completed, the compressor is stopped based on a temperature difference between the temperature of the outdoor heat exchanger and the temperature of the indoor heat exchanger. Second stop time setting means for setting the length of the second stop time to be longer or shorter, and the second stop time setting means after the defrost end determining means determines that defrosting of the outdoor heat exchanger has been completed. And a second compressor stop command means for outputting a stop command to stop the compressor during the second stop time set by the following.
【００１０】上記請求項３の空気調和機によれば、暖房
運転中に、上記着霜判別手段が上記室外熱交換器が着霜
したと判別すると、上記第１停止時間設定手段は、室内
熱交換器の温度と室外熱交換器の温度との温度差の大小
に基づいてデフロスト運転を行う前に圧縮機を停止させ
ている第１停止時間を長短に設定する。すなわち、上記
室内熱交換器の温度と室外熱交換器の温度との温度差に
よって、冷媒回路内の高圧側と低圧側との高低圧差を推
定して、デフロスト運転を開始する前に冷媒回路内を充
分に均圧できるように第１停止時間を設定するのであ
る。次に、上記圧縮機停止指令手段は、着霜判別手段が
室外熱交換器が着霜したと判別してから上記第１停止時
間が経過するまで停止指令を出力して、圧縮機を停止さ
せる。そして、上記圧縮機を停止させて、冷媒回路内を
充分に均圧にした後、四路弁等の切り換えを行って、デ
フロスト運転を開始する。そして、デフロスト運転中
に、上記除霜終了判別手段が上記室外熱交換器の除霜が
終了したと判別すると、上記第２停止時間設定手段は、
室外熱交換器の温度と室内熱交換器の温度との温度差の
大小に基づいて圧縮機を停止させている第２停止時間を
長短に設定する。すなわち、上記室外熱交換器の温度と
室内熱交換器の温度との温度差によって、冷媒回路内の
高圧側と低圧側との高低圧差を推定して、暖房運転を開
始する前に冷媒回路内を充分に均圧できるように第２停
止時間を設定するのである。次に、上記圧縮機停止指令
手段は、除霜終了判別手段が室外熱交換器の除霜が終了
したと判別してから上記第２停止時間が経過するまで停
止指令を出力して、圧縮機を停止させる。そして、上記
圧縮機を停止させて、冷媒回路内を充分に均圧にした
後、四路弁等の切り換えを行って、圧縮機の運転を開始
して暖房運転を再開する。したがって、デフロスト運転
の開始時／終了時に四路弁等の切り換え時の音を低減で
きる。また、デフロスト運転の前後の圧縮機の停止時間
を適正化することによって、圧縮機の停止時間を短縮し
て、快適性を向上できる。According to the air conditioner of the third aspect, if the frost formation determining means determines that the outdoor heat exchanger has formed frost during the heating operation, the first stop time setting means sets the indoor heat conditioner to the first state. The first stop time during which the compressor is stopped before performing the defrost operation is set to be longer or shorter based on the magnitude of the temperature difference between the temperature of the exchanger and the temperature of the outdoor heat exchanger. That is, the temperature difference between the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger is used to estimate the high-low pressure difference between the high-pressure side and the low-pressure side in the refrigerant circuit. The first stop time is set so that the pressure can be sufficiently equalized. Next, the compressor stop command means outputs a stop command until the first stop time elapses after the frost formation determination means determines that the outdoor heat exchanger has formed frost, and stops the compressor. . Then, after stopping the compressor and sufficiently equalizing the pressure in the refrigerant circuit, the four-way valve and the like are switched to start the defrost operation. Then, when the defrost end determining means determines that the defrost of the outdoor heat exchanger has been completed during the defrost operation, the second stop time setting means:
The second stop time for stopping the compressor is set to be longer or shorter based on the magnitude of the temperature difference between the temperature of the outdoor heat exchanger and the temperature of the indoor heat exchanger. That is, the temperature difference between the temperature of the outdoor heat exchanger and the temperature of the indoor heat exchanger is used to estimate the high-low pressure difference between the high-pressure side and the low-pressure side in the refrigerant circuit. The second stop time is set so that the pressure can be sufficiently equalized. Next, the compressor stop command means outputs a stop command until the second stop time elapses after the defrost end determining means determines that defrosting of the outdoor heat exchanger has been completed, and To stop. Then, after stopping the compressor and sufficiently equalizing the pressure in the refrigerant circuit, the four-way valve and the like are switched, the operation of the compressor is started, and the heating operation is restarted. Therefore, the noise at the time of switching the four-way valve at the start / end of the defrost operation can be reduced. Further, by optimizing the stop time of the compressor before and after the defrost operation, the stop time of the compressor can be shortened, and the comfort can be improved.
【００１１】[0011]
【発明の実施の形態】以下、この発明の空気調和機を図
示の実施の形態により詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an air conditioner according to the present invention will be described in detail with reference to the illustrated embodiments.
【００１２】図１はこの発明の実施の一形態の空気調和
機の回路図であり、１は圧縮機、２は上記圧縮機１の吐
出側に接続された四路弁、３は上記四路弁２に一端が接
続された室外熱交換器、４は上記室外熱交換器３の他端
に一端が接続された膨張弁、５は上記膨張弁４の他端に
一端が接続された室内熱交換器、６は上記室内熱交換器
５の他端に四路弁２を介して接続されたアキュムレータ
である。上記圧縮機１,四路弁２,室外熱交換器３,膨張
弁４,室内熱交換器５およびアキュムレータ６で環状の
冷媒回路を構成している。FIG. 1 is a circuit diagram of an air conditioner according to an embodiment of the present invention, wherein 1 is a compressor, 2 is a four-way valve connected to the discharge side of the compressor 1, and 3 is the four-way valve. An outdoor heat exchanger having one end connected to the valve 2, an expansion valve 4 having one end connected to the other end of the outdoor heat exchanger 3, and an indoor heat exchanger 5 having one end connected to the other end of the expansion valve 4. The exchanger 6 is an accumulator connected to the other end of the indoor heat exchanger 5 via the four-way valve 2. The compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the expansion valve 4, the indoor heat exchanger 5, and the accumulator 6 constitute an annular refrigerant circuit.
【００１３】また、上記空気調和機は、上記室外熱交換
器３の温度を検出する温度センサ２１と、室内熱交換器
５の温度を検出する温度センサ２２と、上記温度センサ
２１からの室外熱交換器３の温度を表す信号と温度セン
サ２２からの室内熱交換器５の温度を表す信号とを受け
て、上記圧縮機１の運転等を制御する制御装置１０とを
備えている。Further, the air conditioner includes a temperature sensor 21 for detecting the temperature of the outdoor heat exchanger 3, a temperature sensor 22 for detecting the temperature of the indoor heat exchanger 5, and an outdoor heat sensor from the temperature sensor 21. A control device 10 is provided which receives a signal indicating the temperature of the exchanger 3 and a signal indicating the temperature of the indoor heat exchanger 5 from the temperature sensor 22 and controls the operation of the compressor 1 and the like.
【００１４】また、上記制御装置１０は、マイクロコン
ピュータと入出力回路等からなり、暖房運転時に上記室
外熱交換器３が着霜したか否かを判別する着霜判別手段
としての着霜判別部１１と、上記室内熱交換器５の温度
と室外熱交換器３の温度との温度差に基づいて、第１停
止時間を設定する第１停止時間設定手段としての第１停
止時間設定部１２と、上記着霜判別部１１が室外熱交換
器３が着霜したと判別すると、上記第１停止時間設定部
１２により設定された第１停止時間の間、上記圧縮機１
を停止させる停止指令を出力する第１圧縮機停止指令部
１３と、デフロスト運転中に室外熱交換器３の除霜が終
了したか否かを判別する除霜終了判別手段としての除霜
終了判別部１４と、上記室外熱交換器３の温度と室内熱
交換器５の温度との温度差に基づいて、第２停止時間を
設定する第２停止時間設定手段としての第２停止時間設
定部１５と、上記除霜終了判別部１４が室外熱交換器３
の除霜が終了したと判別すると、上記第２停止時間設定
部１５により設定された第２停止時間の間、上記圧縮機
１を停止させる停止指令を出力する第２圧縮機停止指令
手段としての第２圧縮機停止指令部１６とを有してい
る。The control device 10 comprises a microcomputer, an input / output circuit, and the like, and forms a frost determination section as frost determination means for determining whether or not the outdoor heat exchanger 3 is frosted during the heating operation. A first stop time setting unit 12 as first stop time setting means for setting a first stop time based on a temperature difference between the temperature of the indoor heat exchanger 5 and the temperature of the outdoor heat exchanger 3; When the frost formation determining unit 11 determines that the outdoor heat exchanger 3 has formed frost, the compressor 1 is stopped during the first stop time set by the first stop time setting unit 12.
A first compressor stop command unit 13 that outputs a stop command to stop the defrosting, and a defrost end determination unit that determines whether the defrost of the outdoor heat exchanger 3 has been completed during the defrost operation. Unit 14 and a second stop time setting unit 15 as second stop time setting means for setting a second stop time based on a temperature difference between the temperature of the outdoor heat exchanger 3 and the temperature of the indoor heat exchanger 5. And the defrosting end determining unit 14 determines that the outdoor heat exchanger 3
When it is determined that the defrosting is completed, the second compressor stop command means for outputting a stop command to stop the compressor 1 during the second stop time set by the second stop time setting unit 15 And a second compressor stop command unit 16.
【００１５】上記構成の空気調和機において、暖房運転
を行う場合、四路弁２を実線の切換位置に切り換えて、
圧縮機１を起動する。そして、上記圧縮機１からの高
温,高圧の吐出冷媒は、四路弁２、凝縮器として機能す
る室内熱交換器５、膨張弁４と流れ、上記膨張弁４で減
圧された冷媒は、蒸発器として機能する室外熱交換器
３、四路弁２と流れ、四路弁２からアキュムレータ６に
戻る。このように、図１の実線の矢印方向に冷媒を循環
させる正サイクルによって、室外熱交換器３で熱源とし
ての外気から熱を吸収し、その熱を室内熱交換器５で放
出して、室内の暖房を行う。In the air conditioner having the above configuration, when performing the heating operation, the four-way valve 2 is switched to the switching position indicated by the solid line,
The compressor 1 is started. The high-temperature, high-pressure refrigerant discharged from the compressor 1 flows through the four-way valve 2, the indoor heat exchanger 5 functioning as a condenser, and the expansion valve 4, and the refrigerant decompressed by the expansion valve 4 evaporates. The heat flows through the outdoor heat exchanger 3 and the four-way valve 2 functioning as a heat exchanger, and returns to the accumulator 6 from the four-way valve 2. In this way, by the forward cycle in which the refrigerant is circulated in the direction of the solid line arrow in FIG. 1, heat is absorbed from the outside air as the heat source in the outdoor heat exchanger 3, and the heat is released in the indoor heat exchanger 5, and Perform heating.
【００１６】上記暖房運転において、蒸発器としての室
外熱交換器３に着霜が生じると、制御装置１０の着霜判
別部１１は、温度センサ２１により検出された室外熱交
換器３の温度ＤEに基づいて、室外熱交換器３が着霜し
たと判別すると、上記室内熱交換器５の温度ＤCと室外
熱交換器３の温度ＤEとの温度差(ＤC−ＤE)の大小に基
づいて第１停止時間設定部１２によりデフロスト運転開
始前の第１停止時間を長短に設定する。そして、上記第
１圧縮機停止指令部１３は停止指令を出力して、圧縮機
１を第１停止時間の間停止させた後、室内熱交換器５近
傍に設けられた室内ファン７をオフして、四路弁２を点
線の位置に切り換え、圧縮機１の運転を開始して、図１
の点線の矢印方向に冷媒を循環させる逆サイクルで室外
熱交換器３を除霜するデフロスト運転を行う。In the above-mentioned heating operation, when frost is formed on the outdoor heat exchanger 3 as an evaporator, the frost determination section 11 of the control device 10 determines the temperature D of the outdoor heat exchanger 3 detected by the temperature sensor 21. based on the E, the outdoor heat exchanger 3 when determining that the frost formation, the temperature difference between the temperature D E temperatures D C and the outdoor heat exchanger 3 of the indoor heat exchanger 5 (D C -D E) Based on the magnitude, the first stop time setting unit 12 sets the first stop time before starting the defrost operation to be longer or shorter. Then, the first compressor stop command section 13 outputs a stop command to stop the compressor 1 for the first stop time, and then turns off the indoor fan 7 provided near the indoor heat exchanger 5. Then, the four-way valve 2 is switched to the position indicated by the dotted line, and the operation of the compressor 1 is started.
A defrost operation for defrosting the outdoor heat exchanger 3 is performed in a reverse cycle in which the refrigerant is circulated in the direction of the dotted line.
【００１７】次に、デフロスト運転中に除霜終了判別部
１４が室外熱交換器３の温度に基づいて除霜が終了した
と判別すると、上記室外熱交換器３の温度ＤEと室内熱
交換器５の温度ＤCとの温度差(ＤE−ＤC)の大小に基づ
いて第２停止時間設定部１５により第２停止時間を長短
に設定する。そして、上記除霜が終了したと判別してか
ら第２停止時間設定部１５による設定された第２停止時
間の間、第２圧縮機停止指令部１６は停止指令を出力し
て、圧縮機１を停止させた後、四路弁２を実線の位置に
切り換えて、圧縮機１の運転を開始すると共に室内ファ
ン７をオンして、暖房運転を再開する。Next, during the defrost operation, when the defrost end determining section 14 determines that the defrost has been completed based on the temperature of the outdoor heat exchanger 3, the temperature DE of the outdoor heat exchanger 3 and the indoor heat exchange are determined. the second stop time setting unit 15 based on the magnitude of the temperature difference between the temperature D C vessels 5 (D E -D C) sets the second stop time length. The second compressor stop command unit 16 outputs a stop command for the second stop time set by the second stop time setting unit 15 after determining that the defrosting has been completed, and outputs the stop command. Is stopped, the four-way valve 2 is switched to the position indicated by the solid line, the operation of the compressor 1 is started, the indoor fan 7 is turned on, and the heating operation is restarted.
【００１８】図２は上記空気調和機の制御装置１０の動
作を説明するフローチャートである。FIG. 2 is a flowchart for explaining the operation of the control device 10 for the air conditioner.
【００１９】以下、図２のフローチャートに従って上記
制御装置１０のデフロスト運転時の動作を説明する。The operation of the control device 10 during the defrost operation will be described below with reference to the flowchart of FIG.
【００２０】まず、暖房運転を開始した後、ステップＳ
１で除霜突入判定を行う。すなわち、上記温度センサ２
１により検出された室外熱交換器３の温度に基づいて、
着霜判別部１１により室外熱交換器３が着霜したか否か
を判別するのである。First, after starting the heating operation, step S
At 1, the defrost entry judgment is performed. That is, the temperature sensor 2
1 based on the temperature of the outdoor heat exchanger 3 detected by
The frost determination section 11 determines whether or not the outdoor heat exchanger 3 has formed frost.
【００２１】そして、ステップＳ１で室外熱交換器３に
霜が付着して、除霜突入と判定すると、ステップＳ２に
進む。If frost adheres to the outdoor heat exchanger 3 in step S1, and it is determined that defrost has entered, the process proceeds to step S2.
【００２２】次に、ステップＳ２で室内熱交換器５の温
度ＤCと室外熱交換器３の温度ＤEの温度差(ＤC−ＤE)が
第１所定温度△ＤF以上か否かを判別する。そして、ス
テップＳ２で温度差(ＤC−ＤE)が第１所定温度△ＤF以
上であると判別すると、ステップＳ３に進み、第１停止
時間設定部１２により停止時間をＴＤ５１として、室外
熱交換器３が着霜したと判別してから停止時間ＴＤ５１
の間、第１圧縮機停止指令部１３より停止指令を出力し
て、圧縮機１の運転を停止する。そして、上記圧縮機１
の停止から停止時間ＴＤ５１を経過した後、ステップＳ
５に進む。一方、ステップＳ２で上記温度差(ＤC−ＤE)
が第１所定温度△ＤF未満であると判別すると、ステッ
プＳ４に進み、第１停止時間設定部１２により停止時間
をＴＤ５２(＜ＴＤ５１)として、室外熱交換器３が着霜
したと判別してから停止時間ＴＤ５２の間、第１圧縮機
停止指令部１３より停止指令を出力して、圧縮機１の運
転を停止する。Next, whether the temperature difference between the temperature D E temperatures D C and the outdoor heat exchanger 3 of the indoor heat exchanger 5 (D C -D E) is the first predetermined temperature △ D F or more at step S2 Is determined. When it is determined in step S2 that the temperature difference (D C -D E ) is equal to or higher than the first predetermined temperature ΔD F , the process proceeds to step S3, where the first stop time setting unit 12 sets the stop time to TD51 and sets the outdoor heat to TD51. Stop time TD51 after determining that the exchanger 3 has frosted
During this period, a stop command is output from the first compressor stop command unit 13 to stop the operation of the compressor 1. And the compressor 1
After the stop time TD51 has elapsed since the stop of the operation, step S
Go to 5. On the other hand, in step S2, the temperature difference (D C -D E )
Is determined to be less than the first predetermined temperature ΔD F , the process proceeds to step S4, where the first stop time setting unit 12 determines that the outdoor heat exchanger 3 is frosted with the stop time set to TD52 (<TD51). After that, during the stop time TD52, a stop command is output from the first compressor stop command unit 13 to stop the operation of the compressor 1.
【００２３】次に、ステップＳ５に進み、除霜処理を行
い、ステップＳ６で除霜終了判別部１４により除霜復帰
判定を行う。すなわち、上記室外熱交換器３の温度ＤE
に基づいて、除霜終了判別部１４により室外熱交換器３
に霜が溶けたか否かを判定するのである。Next, the process proceeds to step S5, in which a defrosting process is performed. That is, the temperature D E of the outdoor heat exchanger 3
The outdoor heat exchanger 3 based on the
It is determined whether or not the frost has melted.
【００２４】次に、ステップＳ７に進み、室外熱交換器
３の温度ＤEと室内熱交換器５の温度ＤCとの温度差(ＤE
−ＤC)が第２所定温度△ＤR以上か否かを判別する。そ
して、ステップＳ７で温度差(ＤE−ＤC)が第２所定温度
△ＤR以上であると判別すると、ステップＳ８に進み、
第１停止時間設定部１５により停止時間をＴＤ１０１と
して、デフロスト運転の終了から停止時間ＴＤ１０１が
経過した後、ステップＳ１０に進む。一方、ステップＳ
７で温度差(ＤE−ＤC)が第２所定温度△ＤR未満である
と判別すると、ステップＳ９に進み、第１停止時間設定
部１５により停止時間をＴＤ１０２(＜ＴＤ１０１)とし
て、デフロスト運転の終了から停止時間ＴＤ１０２が経
過した後、ステップＳ１０に進む。Next, the process proceeds to step S7, the temperature difference between the temperature D C temperature D E and the indoor heat exchanger 5 of the outdoor heat exchanger 3 (D E
-D C ) is determined to be equal to or higher than the second predetermined temperature ΔD R. When it is determined in step S7 that the temperature difference (D E -D C ) is equal to or higher than the second predetermined temperature ΔD R , the process proceeds to step S8.
The stop time is set to TD101 by the first stop time setting unit 15, and after the stop time TD101 has elapsed from the end of the defrost operation, the process proceeds to step S10. On the other hand, step S
If it is determined in step 7 that the temperature difference (D E -D C ) is less than the second predetermined temperature △ D R , the process proceeds to step S9, where the first stop time setting unit 15 sets the stop time to TD102 (<TD101) and sets the defrost After the stop time TD102 has elapsed from the end of the operation, the process proceeds to step S10.
【００２５】次に、ステップＳ１０で暖房運転を再開す
る。すなわち、上記四路弁２を実線の切換位置に切り換
えて、圧縮機１の運転を開始するのである。Next, in step S10, the heating operation is restarted. That is, the four-way valve 2 is switched to the switching position indicated by the solid line, and the operation of the compressor 1 is started.
【００２６】このように、デフロスト運転を行うとき、
室外熱交換器３の温度と室内熱交換器５の温度との温度
差の大小に応じて、デフロスト運転の開始前／終了後の
各停止時間を長短に設定することによって、各停止時間
を適正化することができ、冷媒回路内を充分に均圧にし
て、四路弁２の切り換えによる音の発生を押さえること
ができると共に、停止時間が必要以上に長くなって快適
性が損なわれることもない。As described above, when performing the defrost operation,
According to the magnitude of the temperature difference between the temperature of the outdoor heat exchanger 3 and the temperature of the indoor heat exchanger 5, each stop time before and after the start of the defrost operation is set to be long and short, so that each stop time is appropriate. The pressure in the refrigerant circuit can be sufficiently equalized to suppress the generation of noise due to the switching of the four-way valve 2, and the stop time becomes longer than necessary, and the comfort may be impaired. Absent.
【００２７】[0027]
【発明の効果】以上より明らかなように、請求項１の発
明の空気調和機は、圧縮機,室外熱交換器,膨張手段およ
び室内熱交換器が環状に接続された冷媒回路を備えて、
上記室外熱交換器を除霜するデフロスト運転を行う空気
調和機において、暖房運転中に、着霜判別手段が室外熱
交換器が着霜したと判別すると、停止時間設定手段は、
室内熱交換器の温度と室外熱交換器の温度との温度差の
大小に基づいて、冷媒回路内の高圧側と低圧側との高低
圧差を推定して、デフロスト運転を開始する前に冷媒回
路内を充分に均圧できるように圧縮機の停止時間を長短
に設定し、圧縮機停止指令手段は、着霜判別手段が室外
熱交換器が着霜したと判別してから上記停止時間が経過
するまで停止指令を出力して、圧縮機を停止させて、冷
媒回路内を充分に均圧にした後、四路弁等の切り換えを
行って、デフロスト運転を開始する。したがって、デフ
ロスト運転の開始時に四路弁等の切り換え時の音を低減
することができる。また、デフロスト運転の開始前の圧
縮機の停止時間を適正化することによって、圧縮機の停
止時間を短縮して、快適性を向上することができる。As is clear from the above, the air conditioner according to the first aspect of the present invention includes a refrigerant circuit in which a compressor, an outdoor heat exchanger, expansion means, and an indoor heat exchanger are connected in a ring.
In the air conditioner performing a defrost operation for defrosting the outdoor heat exchanger, during the heating operation, when the frost formation determination unit determines that the outdoor heat exchanger has formed frost, the stop time setting unit includes:
Based on the magnitude of the temperature difference between the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger, the pressure difference between the high pressure side and the low pressure side in the refrigerant circuit is estimated, and the refrigerant circuit is started before starting the defrost operation. The stop time of the compressor is set to be long or short so that the inside of the compressor can be sufficiently equalized.The stop time of the compressor elapses after the frost formation determining means determines that the outdoor heat exchanger has formed frost. After the stop command is output, the compressor is stopped, and the pressure in the refrigerant circuit is sufficiently equalized. Then, the four-way valve is switched, and the defrost operation is started. Therefore, it is possible to reduce the noise when switching the four-way valve or the like at the start of the defrost operation. In addition, by optimizing the stop time of the compressor before the start of the defrost operation, the stop time of the compressor can be reduced, and the comfort can be improved.
【００２８】また、請求項２の発明の空気調和機は、圧
縮機,室外熱交換器,膨張手段および室内熱交換器が環状
に接続された冷媒回路を備えて、デフロスト運転中に、
除霜終了判別手段が室外熱交換器の除霜が終了したと判
別すると、停止時間設定手段は、室外熱交換器の温度と
室内熱交換器の温度との温度差の大小に基づいて、冷媒
回路内の高圧側と低圧側との高低圧差を推定して、暖房
運転を開始する前に冷媒回路内を充分に均圧できるよう
に圧縮機の停止時間を長短に設定し、圧縮機停止指令手
段は、除霜終了判別手段が室外熱交換器の除霜が終了し
たと判別してから上記停止時間が経過するまで停止指令
を出力して、圧縮機を停止させて、冷媒回路内を充分に
均圧にした後、四路弁等の切り換えを行って、圧縮機の
運転を開始して暖房運転を再開する。したがって、デフ
ロスト運転の終了時に四路弁等の切り換え時の音を低減
することができる。また、デフロスト運転の終了後の圧
縮機の停止時間を適正化することによって、圧縮機の停
止時間を短縮して、快適性を向上することができる。The air conditioner according to the second aspect of the present invention includes a refrigerant circuit in which a compressor, an outdoor heat exchanger, an expansion means, and an indoor heat exchanger are connected in a ring shape.
When the defrost end determining means determines that the defrosting of the outdoor heat exchanger has been completed, the stop time setting means determines the refrigerant based on the magnitude of the temperature difference between the temperature of the outdoor heat exchanger and the temperature of the indoor heat exchanger. Estimate the high / low pressure difference between the high pressure side and the low pressure side in the circuit, set the compressor stop time longer or shorter so that the pressure in the refrigerant circuit can be sufficiently equalized before starting the heating operation, and set the compressor stop command. The means outputs a stop command until the stop time elapses after the defrost end determination means determines that defrosting of the outdoor heat exchanger has been completed, stops the compressor, and sufficiently stops the refrigerant circuit. After the pressure is equalized, the four-way valve and the like are switched, the operation of the compressor is started, and the heating operation is restarted. Therefore, it is possible to reduce the noise when switching the four-way valve or the like at the end of the defrost operation. In addition, by optimizing the stop time of the compressor after the end of the defrost operation, the stop time of the compressor can be reduced, and the comfort can be improved.
【００２９】また、請求項３の発明の空気調和機は、圧
縮機,室外熱交換器,膨張手段および室内熱交換器が環状
に接続された冷媒回路を備えて、暖房運転中に、着霜判
別手段が室外熱交換器が着霜したと判別すると、第１停
止時間設定手段は、室内熱交換器の温度と室外熱交換器
の温度との温度差の大小に基づいて、冷媒回路内の高圧
側と低圧側との高低圧差を推定して、デフロスト運転を
開始する前に冷媒回路内を充分に均圧できるように第１
停止時間を長短に設定し、圧縮機停止指令手段は、着霜
判別手段が室外熱交換器が着霜したと判別してから第１
停止時間が経過するまで停止指令を出力して、圧縮機を
停止させて、冷媒回路内を充分に均圧にした後、四路弁
等の切り換えを行って、デフロスト運転を開始し、その
後、デフロスト運転中に、除霜終了判別手段が室外熱交
換器の除霜が終了したと判別すると、第２停止時間設定
手段は、室外熱交換器の温度と室内熱交換器の温度との
温度差の大小に基づいて、冷媒回路内の高圧側と低圧側
との高低圧差を推定して、暖房運転の開始前に冷媒回路
内を充分に均圧できるように第２停止時間を長短に設定
し、圧縮機停止指令手段は、除霜終了判別手段が室外熱
交換器の除霜が終了したと判別してから第２停止時間が
経過するまで停止指令を出力して、圧縮機を停止させ、
冷媒回路内を充分に均圧にした後、四路弁等の切り換え
を行って、圧縮機の運転を開始して暖房運転を再開す
る。したがって、デフロスト運転の開始時／終了時に四
路弁等の切り換え時の音を低減することができる。ま
た、デフロスト運転の前後の圧縮機の停止時間を適正化
することによって、停止時間を短縮して、快適性を向上
することができる。An air conditioner according to a third aspect of the present invention includes a refrigerant circuit in which a compressor, an outdoor heat exchanger, an expansion means, and an indoor heat exchanger are connected in a ring shape. When the determining unit determines that the outdoor heat exchanger has formed frost, the first stop time setting unit determines whether the temperature of the indoor heat exchanger and the temperature of the outdoor heat exchanger are different from each other based on the magnitude of the temperature difference between the indoor heat exchanger and the outdoor heat exchanger. The first pressure difference between the high pressure side and the low pressure side is estimated, and the first pressure is set to sufficiently equalize the pressure in the refrigerant circuit before starting the defrost operation.
The stop time is set to be short or long, and the compressor stop command means determines the first time after the frost formation determination means has determined that the outdoor heat exchanger has formed frost.
The stop command is output until the stop time elapses, the compressor is stopped, and after the pressure in the refrigerant circuit is sufficiently equalized, the four-way valve and the like are switched, and the defrost operation is started. If the defrosting end determining means determines that the defrosting of the outdoor heat exchanger has been completed during the defrost operation, the second stop time setting means determines the temperature difference between the temperature of the outdoor heat exchanger and the temperature of the indoor heat exchanger. Based on the magnitude of, the high and low pressure difference between the high pressure side and the low pressure side in the refrigerant circuit is estimated, and the second stop time is set long and short so that the pressure in the refrigerant circuit can be sufficiently equalized before the heating operation starts. The compressor stop command means outputs a stop command until the second stop time elapses after the defrost end determination means determines that the defrost of the outdoor heat exchanger has been completed, and stops the compressor;
After sufficiently equalizing the pressure in the refrigerant circuit, the four-way valve and the like are switched to start the operation of the compressor and restart the heating operation. Therefore, it is possible to reduce the noise when switching the four-way valve or the like at the start / end of the defrost operation. In addition, by optimizing the stop time of the compressor before and after the defrost operation, the stop time can be reduced, and the comfort can be improved.
【図１】 図１はこの発明の実施の一形態の空気調和機
の回路図である。FIG. 1 is a circuit diagram of an air conditioner according to an embodiment of the present invention.
【図２】 図２は上記空気調和機の制御装置のデフロス
ト運転時の動作を説明するフローチャートである。FIG. 2 is a flowchart illustrating an operation of the control device of the air conditioner during a defrost operation.
１…圧縮機、２…四路弁、３…室外熱交換器、４…膨張
弁、５…室内熱交換器、６…アキュムレータ、７…室内
ファン、１０…制御装置、１１…着霜判別部、１２…第
１停止時間設定部、１３…第１圧縮機停止指令部、１４
…除霜終了判別部、１５…第２停止時間設定部、１６…
第２圧縮機停止指令部、２１,２２…温度センサ。DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Four-way valve, 3 ... Outdoor heat exchanger, 4 ... Expansion valve, 5 ... Indoor heat exchanger, 6 ... Accumulator, 7 ... Indoor fan, 10 ... Control device, 11 ... Defrosting determination part , 12: first stop time setting unit, 13: first compressor stop command unit, 14
... Defrosting end determining unit, 15 ... Second stop time setting unit, 16 ...
2nd compressor stop command part, 21, 22 ... temperature sensor.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F25B 47/02 F24F 11/02 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 6 , DB name) F25B 47/02 F24F 11/02
Claims (3)
(４)および室内熱交換器(５)が環状に接続された冷媒回
路を備えて、上記室外熱交換器(３)を除霜するデフロス
ト運転を行う空気調和機において、 暖房運転時に上記室外熱交換器(３)が着霜したか否かを
判別する着霜判別手段(１１)と、 上記着霜判別手段(１１)が上記室外熱交換器(３)が着霜
したと判別すると、上記室内熱交換器(５)の温度と上記
室外熱交換器(３)の温度との温度差の大小に基づいてデ
フロスト運転を行う前に上記圧縮機(１)を停止させてい
る停止時間を長短に設定する停止時間設定手段(１２)
と、 上記着霜判別手段(１１)が上記室外熱交換器(３)が着霜
したと判別してから上記停止時間設定手段(１４)により
設定された上記停止時間の間、上記圧縮機(１)を停止さ
せる停止指令を出力する圧縮機停止指令手段(１３)とを
備えたことを特徴とする空気調和機。1. Compressor (1), outdoor heat exchanger (3), expansion means
(4) An air conditioner that performs a defrost operation for defrosting the outdoor heat exchanger (3) by providing a refrigerant circuit in which the indoor heat exchanger (5) is connected in a ring shape. The frost formation determining means (11) for determining whether or not the exchanger (3) has formed frost; and the frost formation determination means (11) determines that the outdoor heat exchanger (3) has formed frost. Based on the difference between the temperature of the indoor heat exchanger (5) and the temperature of the outdoor heat exchanger (3), the stop time of stopping the compressor (1) before performing the defrost operation is shortened. Stop time setting means (12) for setting
After the frost formation determining means (11) determines that the outdoor heat exchanger (3) has formed frost, the compressor ( An air conditioner comprising: a compressor stop command means (13) for outputting a stop command for stopping 1).
(４)および室内熱交換器(５)が環状に接続された冷媒回
路を備えて、上記室外熱交換器(３)を除霜するデフロス
ト運転を行う空気調和機において、 上記室外熱交換器(３)の除霜が終了したか否かを判別す
る除霜終了判別手段(１４)と、 上記除霜終了判別手段(１４)が上記室外熱交換器(３)の
除霜が終了したと判別すると、上記室外熱交換器(３)の
温度と上記室内熱交換器(５)の温度との温度差の大小に
基づいて、上記圧縮機(１)を停止させている停止時間を
長短に設定する停止時間設定手段(１５)と、 上記除霜終了判別手段(１４)が上記室外熱交換器(３)の
除霜が終了したと判別してから上記停止時間設定手段
(１５)により設定された上記停止時間の間、上記圧縮機
(１)を停止させる停止指令を出力する圧縮機停止指令手
段(１６)とを備えたことを特徴とする空気調和機。2. Compressor (1), outdoor heat exchanger (3), expansion means
(4) and an indoor heat exchanger (5) provided with a refrigerant circuit connected in a ring shape, wherein the outdoor heat exchanger (3) performs a defrost operation for defrosting the outdoor heat exchanger (3). The defrost end determining means (14) for determining whether or not the defrost of 3) is completed, and the defrost end determining means (14) determines that the defrost of the outdoor heat exchanger (3) is completed. Then, based on the magnitude of the temperature difference between the temperature of the outdoor heat exchanger (3) and the temperature of the indoor heat exchanger (5), the stop time for stopping the compressor (1) is set to be longer or shorter. A stop time setting means (15), and a stop time setting means after the defrost end determining means (14) determines that defrosting of the outdoor heat exchanger (3) has been completed.
During the stop time set by (15), the compressor
An air conditioner comprising: a compressor stop command means (16) for outputting a stop command for stopping (1).
(４)および室内熱交換器(５)が環状に接続された冷媒回
路を備えて、上記室外熱交換器(３)を除霜するデフロス
ト運転を行う空気調和機において、 暖房運転時に上記室外熱交換器(３)が着霜したか否かを
判別する着霜判別手段(１１)と、 上記着霜判別手段(１１)が上記室外熱交換器(３)が着霜
したと判別すると、上記室内熱交換器(５)の温度と上記
室外熱交換器(３)の温度との温度差の大小に基づいてデ
フロスト運転を行う前に上記圧縮機(１)を停止させてい
る第１停止時間を長短に設定する第１停止時間設定手段
(１２)と、 上記着霜判別手段(１１)が上記室外熱交換器(３)が着霜
したと判別してから上記第１停止時間設定手段(１２)に
より設定された上記第１停止時間の間、上記圧縮機(１)
を停止させる停止指令を出力する第１圧縮機停止指令手
段(１３)と、 上記室外熱交換器(３)の除霜が終了したか否かを判別す
る除霜終了判別手段(１４)と、 上記除霜終了判別手段(１４)が上記室外熱交換器(３)の
除霜が終了したと判別すると、上記室外熱交換器(３)の
温度と上記室内熱交換器(５)の温度との温度差の大小に
基づいて上記圧縮機(１)を停止させている第２停止時間
を長短に設定する第２停止時間設定手段(１５)と、 上記除霜終了判別手段(１４)が上記室外熱交換器(３)の
除霜が終了したと判別してから上記第２停止時間設定手
段(１５)により設定された上記第２停止時間の間、上記
圧縮機(１)を停止させる停止指令を出力する第２圧縮機
停止指令手段(１６)とを備えたことを特徴とする空気調
和機。3. Compressor (1), outdoor heat exchanger (3), expansion means
(4) An air conditioner that performs a defrost operation for defrosting the outdoor heat exchanger (3) by providing a refrigerant circuit in which the indoor heat exchanger (5) is connected in a ring shape. The frost formation determining means (11) for determining whether or not the exchanger (3) has formed frost; and the frost formation determination means (11) determines that the outdoor heat exchanger (3) has formed frost. A first stop time during which the compressor (1) is stopped before performing the defrost operation based on the temperature difference between the temperature of the indoor heat exchanger (5) and the temperature of the outdoor heat exchanger (3). Stop time setting means for setting the length of time
(12) The first stop time set by the first stop time setting means (12) after the frost formation determining means (11) determines that the outdoor heat exchanger (3) has formed frost. During the above compressor (1)
A first compressor stop command means (13) for outputting a stop command to stop the operation, a defrost end determining means (14) for determining whether or not the defrost of the outdoor heat exchanger (3) has been completed, When the defrost end determining means (14) determines that defrosting of the outdoor heat exchanger (3) has been completed, the temperature of the outdoor heat exchanger (3) and the temperature of the indoor heat exchanger (5) are determined. A second stop time setting unit (15) for setting the second stop time for stopping the compressor (1) to be longer or shorter based on the magnitude of the temperature difference between the first and second compressors; A stop for stopping the compressor (1) during the second stop time set by the second stop time setting means (15) after determining that the defrosting of the outdoor heat exchanger (3) has been completed. An air conditioner comprising: a second compressor stop command means (16) for outputting a command.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8251507A JP2909963B2 (en) | 1996-09-24 | 1996-09-24 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8251507A JP2909963B2 (en) | 1996-09-24 | 1996-09-24 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1096573A JPH1096573A (en) | 1998-04-14 |
| JP2909963B2 true JP2909963B2 (en) | 1999-06-23 |
Family
ID=17223847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8251507A Expired - Fee Related JP2909963B2 (en) | 1996-09-24 | 1996-09-24 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2909963B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6237357B1 (en) * | 1999-06-07 | 2001-05-29 | Mitsubishi Heavy Industries, Ltd. | Vehicular air conditioner using heat pump |
| CN101233375B (en) * | 2005-06-06 | 2011-09-14 | 开利公司 | Method for preventing spill start in heat pump and controller |
| CN102884384A (en) * | 2010-09-27 | 2013-01-16 | 东芝开利株式会社 | Hot water supply system |
| JPWO2017037891A1 (en) * | 2015-09-02 | 2018-04-19 | 三菱電機株式会社 | Refrigeration cycle equipment |
| CN105299843B (en) * | 2015-11-17 | 2017-10-27 | 广东美的制冷设备有限公司 | Air conditioner is controlled to enter the method and air conditioner of defrosting mode |
| CN114738937B (en) * | 2022-04-29 | 2024-03-01 | 邯郸美的制冷设备有限公司 | Control method and device, air conditioning equipment and storage medium |
-
1996
- 1996-09-24 JP JP8251507A patent/JP2909963B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1096573A (en) | 1998-04-14 |
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