JP2011196647A - Heat pump water heater - Google Patents

Heat pump water heater Download PDF

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JP2011196647A
JP2011196647A JP2010066081A JP2010066081A JP2011196647A JP 2011196647 A JP2011196647 A JP 2011196647A JP 2010066081 A JP2010066081 A JP 2010066081A JP 2010066081 A JP2010066081 A JP 2010066081A JP 2011196647 A JP2011196647 A JP 2011196647A
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air
heat exchanger
compressor
blower
refrigerant
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Takashi Ito
伊藤　　隆
Tamayuki Sato
瑞之 佐藤
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Corona Corp
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Corona Corp
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Abstract

PROBLEM TO BE SOLVED: To solve a problem wherein in a conventional heat pump water heater, an abnormal stop may occur due to overload of a compressor in an upwind state.SOLUTION: This heat pump water heater includes: a compressor 8 compressing and discharging a refrigerant and capable of changing operational frequency; a water heat exchanger 9 exchanging heat between the refrigerant from the compressor 8 and water for hot water supply; an expansion valve 10 decompressing and expanding the refrigerant from the water heat exchanger 9 and capable of changing an opening; an air heat exchanger 11 exchanging heat between the low-temperature low-pressure refrigerant from the expansion valve 10 and air; an air blower 12 sending air to the air heat exchanger 11; and wind direction sensing means 13, 22 sensing that the air blowing state to the air heat exchanger 11 is an upwind state. The heat pump water heater performs load reduction control to stop the operation of the air blower 12 and reduce the operational frequency of the compressor 8 and/or open an opening of the expansion valve 10 when the wind direction sensing means 13, 22 sense the upwind state.

Description

本発明は、空気熱源のヒートポンプで給湯用の水を沸き上げるヒートポンプ給湯機に関するものである。   The present invention relates to a heat pump water heater for boiling water for hot water supply with a heat pump of an air heat source.

従来よりこの種のヒートポンプ給湯機では、特許文献１に示されるように、給湯用の湯水を貯湯する貯湯タンクと、貯湯タンク内の湯水を加熱するヒートポンプユニットとを備え、ヒートポンプユニットには、冷媒を高温高圧に圧縮する圧縮機と、給湯用の湯水を加熱する水熱交換器と、膨張弁と、空気熱交換器と、空気熱交換器に送風する送風機とが備えられているものであった。   Conventionally, this type of heat pump water heater includes a hot water storage tank for storing hot water for hot water supply and a heat pump unit for heating the hot water in the hot water storage tank, as disclosed in Patent Document 1, and the heat pump unit includes a refrigerant. A compressor that compresses the hot water to high temperature and pressure, a water heat exchanger that heats hot water for hot water supply, an expansion valve, an air heat exchanger, and a blower that blows air to the air heat exchanger. It was.

そして、空気熱交換器に送風する送風機に逆風が吹いて送風機の回転数が目標回転数に満たない場合は、送風機の駆動を停止して、送風ファンをフリーランさせて逆風によって空気熱交換器へ熱源となる外気を通風させるようにしていた。   And when the back wind blows to the air blower that blows to the air heat exchanger and the rotation speed of the blower is less than the target rotation speed, the drive of the blower is stopped, the air blower is free run, and the air heat exchanger is driven by the reverse wind The outside air, which is a heat source, was ventilated.

特開２００４−１４４３２９号公報JP 2004-144329 A

ところがこの従来のものでは、送風機の駆動を停止すると、空気熱交換器を流れる風が順風から一旦無風となってその後に逆風となるが、無風状態の際に、空気熱交換器での冷媒の蒸発能力が低下し、冷媒密度が高い冷媒が圧縮機に吸入されて圧縮されるため、圧縮機の負荷が急上昇して、圧縮機が異常停止してしまうことがあった。   However, in this conventional system, when the drive of the blower is stopped, the wind flowing through the air heat exchanger temporarily changes from the normal wind to no wind, and then becomes the reverse wind. However, when there is no wind, the refrigerant in the air heat exchanger Since the evaporation capacity is reduced and the refrigerant having a high refrigerant density is sucked into the compressor and compressed, the load on the compressor suddenly increases, and the compressor may be abnormally stopped.

また、風向が定まらず順風と逆風を頻繁に繰り返すような場合は、圧縮機負荷の急上昇により頻繁に圧縮機が停止してしまい、給湯用の湯を沸き上げることができない事態に至る可能性もあった。   In addition, if the wind direction is not fixed and the normal and reverse winds are repeated frequently, the compressor may stop frequently due to a sudden rise in the compressor load, leading to a situation where the hot water for hot water supply cannot be boiled. there were.

そこで、本発明は上記課題を解決するため、冷媒を圧縮して吐出する運転周波数の変更可能な圧縮機と、前記圧縮機からの冷媒と給湯用の水とを熱交換する水熱交換器と、前記水熱交換器からの冷媒を減圧膨張させる開度変更可能な膨張弁と、前記膨張弁からの低温低圧冷媒と空気とを熱交換する空気熱交換器と、前記空気熱交換器に空気を送風する送風機と、前記空気熱交換器への送風状態が逆風状態であることを検知する風向検知手段と、前記風向検知手段が逆風状態を検知すると、前記送風機の駆動を停止すると共に、前記圧縮機の運転周波数を低下する、および／または、前記膨張弁の開度を開くようにした負荷軽減制御を行う。   Therefore, in order to solve the above problems, the present invention is a compressor capable of changing the operating frequency for compressing and discharging the refrigerant, and a water heat exchanger for exchanging heat between the refrigerant from the compressor and water for hot water supply. An expansion valve capable of changing an opening for decompressing and expanding the refrigerant from the water heat exchanger, an air heat exchanger for exchanging heat between the low-temperature and low-pressure refrigerant and the air from the expansion valve, and air to the air heat exchanger And a wind direction detecting means for detecting that the air blowing state to the air heat exchanger is a back wind state, and when the wind direction detecting means detects a back wind state, the drive of the blower is stopped, and The load reduction control is performed such that the operating frequency of the compressor is lowered and / or the opening of the expansion valve is opened.

また、前記負荷軽減制御に続いて、逆風状態を検知する前の加熱能力よりも加熱能力を低下する能力低下制御を行うと共に、前記風向検知手段が逆風状態の解消を検知すると、前記送風機の駆動を再開し、前記能力低下制御を終了して加熱能力を元に戻すようにした。   In addition, following the load reduction control, the ability reduction control is performed to lower the heating ability compared to the heating ability before detecting the headwind condition, and when the wind direction detection means detects the cancellation of the headwind condition, the blower is driven. Was resumed, the ability reduction control was terminated, and the heating ability was restored.

また、前記風向検知手段は、前記送風機の回転数を検出する回転数センサを備え、この回転数センサで検出する前記送風機の回転数が目標回転数よりも一定回転数以上低い場合あるいは回転数センサが逆回転を検出している場合に、逆風状態であることを検知するようにした。   In addition, the wind direction detection means includes a rotation speed sensor that detects the rotation speed of the blower, and the rotation speed sensor detects the rotation speed of the blower detected by the rotation speed sensor or lower than the target rotation speed by a predetermined rotation speed or more. Detects that the wind is in a reverse wind condition when detecting reverse rotation.

以上のように本発明によれば、順風から逆風への切り換わり時に空気熱交換器の蒸発能力が低下して圧縮機に流入する冷媒密度が急激に上昇する際に、圧縮機の運転周波数を低下するかまたは膨張弁の開度を開いて負荷を低減するので、高負荷によって運転停止に至る可能性を減少することができ、風向の安定しない状況においても安定的に給湯用の水を加熱する沸き上げ運転を行うことが可能となる。   As described above, according to the present invention, when the evaporation capacity of the air heat exchanger decreases and the density of refrigerant flowing into the compressor rapidly increases when switching from normal wind to reverse wind, the operating frequency of the compressor is reduced. Since the load is reduced by reducing or opening the opening of the expansion valve, the possibility of shutting down due to high load can be reduced, and the water for hot water supply can be heated stably even when the wind direction is unstable It is possible to perform a boiling operation.

また、逆風が収まって送風機を駆動再開した後に一時的に無風状態を経過するが、その際に、加熱能力が低減されているため負荷が小さく、圧縮機に流入する冷媒密度が急激に上昇しても運転停止に至る可能性を減少することができ、風向の安定しない状況においても安定的に給湯用の水を加熱する沸き上げ運転を行うことが可能となる。   In addition, after the wind breeze settles and the blower resumes driving, the windless state temporarily elapses. At that time, the heating capacity is reduced, so the load is small and the density of refrigerant flowing into the compressor rises rapidly. However, it is possible to reduce the possibility of the operation being stopped, and it is possible to perform a boiling operation in which the water for hot water supply is stably heated even in a situation where the wind direction is not stable.

本発明の一実施形態の概略構成図Schematic configuration diagram of one embodiment of the present invention 同一実施形態の作動を説明するためのタイムチャートTime chart for explaining the operation of the same embodiment

次に、本発明の一実施形態を図面に基づいて説明する。
１は給湯用の湯水を貯える貯湯タンク２を備えたタンクユニット、３は貯湯タンク２下部に接続された給水管、４は貯湯タンク２上部に接続された出湯管、５は貯湯タンク２の側面上下に複数設けられ貯湯温度を検出する貯湯温度センサである。 Next, an embodiment of the present invention will be described with reference to the drawings.
1 is a tank unit having a hot water storage tank 2 for storing hot water for hot water supply, 3 is a water supply pipe connected to the lower part of the hot water storage tank 2, 4 is a hot water pipe connected to the upper part of the hot water storage tank 2, and 5 is a side surface of the hot water storage tank 2. It is a hot water storage temperature sensor that is provided in plural above and below to detect hot water storage temperature.

６は給湯用の湯水を沸き上げるヒートポンプ回路７を備えたヒートポンプユニットで、ヒートポンプ回路７は、冷媒を高温高圧に圧縮して吐出する圧縮機８と、圧縮機８からの高温高圧の冷媒と給湯用の水とを熱交換する水熱交換器９と、水熱交換器９から流出した温度低下した冷媒を減圧膨張させる膨張弁１０と、膨張弁１０で低温低圧とされた冷媒と熱源となる空気とを熱交換する空気熱交換器１１とを冷媒配管で環状に接続して構成されている。ここで圧縮機８はインバータ制御によってその運転周波数を可変可能に構成され、膨張弁１０はその開度を可変可能に構成されているものである。   Reference numeral 6 denotes a heat pump unit including a heat pump circuit 7 for boiling hot water for hot water supply. The heat pump circuit 7 compresses and discharges the refrigerant at high temperature and high pressure, and the high temperature and high pressure refrigerant from the compressor 8 and hot water supply. A heat exchanger 9 for exchanging heat with water, an expansion valve 10 for decompressing and expanding the refrigerant whose temperature has flowed out of the water heat exchanger 9, and a refrigerant having a low temperature and a low pressure by the expansion valve 10 and a heat source. An air heat exchanger 11 that exchanges heat with air is connected in a ring shape with a refrigerant pipe. Here, the compressor 8 is configured to be able to vary its operating frequency by inverter control, and the expansion valve 10 is configured to be capable of varying its opening.

１２は空気熱交換器１１に外気を送風するモータ駆動の送風機、１３は送風機の回転数を送風方向と共に検出する回転数センサ、１４は空気熱交換器１１を通過する外気の温度を検出する外気温度センサ、１５は圧縮機８から吐出された冷媒温度を検出する吐出冷媒温度センサである。   12 is a motor-driven blower that blows outside air to the air heat exchanger 11, 13 is a rotation speed sensor that detects the rotation speed of the blower together with the blowing direction, and 14 is outside air that detects the temperature of the outside air that passes through the air heat exchanger 11. A temperature sensor 15 is a discharge refrigerant temperature sensor that detects the refrigerant temperature discharged from the compressor 8.

１６は貯湯タンク２下部と水熱交換器９の入口を接続する入水管、１７は水熱交換器９の出口と貯湯タンク２上部を接続する沸き上げ管、１８は入水管１６途中に設けられた循環ポンプ、１９は入水管１６に設けられて入水温度を検出する入水温度センサ、２０は沸き上げ管１７に設けられて水熱交換器９を通過後の沸き上げ温度を検出する沸き上げ温度センサである。   16 is a water inlet pipe connecting the lower part of the hot water storage tank 2 and the inlet of the water heat exchanger 9, 17 is a heating pipe connecting the outlet of the water heat exchanger 9 and the upper part of the hot water tank 2, and 18 is provided in the middle of the water inlet pipe 16. The circulation pump 19 is provided in the inlet pipe 16 to detect the incoming water temperature, and 20 is provided in the boiling pipe 17 to detect the boiling temperature after passing through the water heat exchanger 9. It is a sensor.

２１は予め制御プログラムを記憶され、記憶処理、演算処理等を行うマイクロコンピュータを備えてタンクユニットの制御を行う貯湯制御手段で、貯湯温度センサ５で検出する各貯湯温度から沸き上げ運転の要不要を判断して、ヒートポンプユニット６に沸き上げ運転の開始と停止を指示するものである。   Reference numeral 21 denotes a hot water storage control means for storing a control program in advance and having a microcomputer for performing storage processing, arithmetic processing, etc., and controlling the tank unit. It is not necessary to perform a boiling operation from each hot water temperature detected by the hot water temperature sensor 5. And instructing the heat pump unit 6 to start and stop the boiling operation.

２２は予め制御プログラムを記憶され、記憶処理、演算処理等を行うマイクロコンピュータを備えてヒートポンプユニット６の制御を行う加熱制御手段で、貯湯制御手段２１からの指示によって沸き上げ運転を開始または停止を行うものである。また、この加熱制御手段２２と回転数センサ１３によって空気熱交換器１１への送風状態が逆風状態であることを検知する風向検知手段を構成している。   Reference numeral 22 denotes a heating control means that stores a control program in advance and includes a microcomputer that performs storage processing, arithmetic processing, etc., and controls the heat pump unit 6. The heating operation is started or stopped by an instruction from the hot water storage control means 21. Is what you do. The heating control means 22 and the rotation speed sensor 13 constitute wind direction detection means for detecting that the air blowing state to the air heat exchanger 11 is a headwind state.

次に、沸き上げ運転時の作動について説明すると、加熱制御手段２２は貯湯制御手段２１からの沸き上げ運転の開始指示を受けると、所定の加熱能力で運転すべく圧縮機８を所定の運転周波数で駆動し、送風機１２を所定の指示回転数で駆動し、さらに膨張弁１０を所定開度にすると共に、循環ポンプ１８を駆動して沸き上げ温度センサ２０で検出する沸き上げ温度が所望の沸き上げ温度となるように沸き上げ運転を開始する。   Next, the operation during the boiling operation will be described. When the heating control means 22 receives an instruction to start the boiling operation from the hot water storage control means 21, the compressor 8 is operated at a predetermined operating frequency to operate at a predetermined heating capacity. And the blower 12 is driven at a predetermined indicated rotational speed, and the expansion valve 10 is set to a predetermined opening, and the circulating pump 18 is driven and the boiling temperature detected by the boiling temperature sensor 20 is a desired boiling point. Start boiling operation to raise the temperature.

この実施形態では、圧縮機８の所定の運転周波数は、所定の加熱能力、所望の沸き上げ温度、外気温度センサ１４で検出する外気温度、および貯湯温度センサ５あるいは入水温度センサ１９で検出した入水温度に応じて加熱制御手段２２が導出し、膨張弁１０の開度は吐出冷媒温度センサ１５が検出する温度が所定の温度となるようにフィードバック制御される。また、送風機１２の所定の指示回転数は、所定の加熱能力および外気温度に応じて定められ、循環ポンプ１８の回転数は沸き上げ温度センサ２０で検出する沸き上げ温度が所望の沸き上げ温度と一致するようにフィードバック制御される。   In this embodiment, the predetermined operating frequency of the compressor 8 includes predetermined heating capacity, desired boiling temperature, outside air temperature detected by the outside air temperature sensor 14, and incoming water detected by the hot water storage temperature sensor 5 or the incoming water temperature sensor 19. The heating control means 22 derives according to the temperature, and the opening degree of the expansion valve 10 is feedback controlled so that the temperature detected by the discharged refrigerant temperature sensor 15 becomes a predetermined temperature. Moreover, the predetermined instruction | indication rotation speed of the air blower 12 is determined according to predetermined | prescribed heating capability and external temperature, and the rotation speed of the circulation pump 18 is the boiling temperature detected by the boiling temperature sensor 20, and the desired boiling temperature. Feedback control is performed to match.

そして、貯湯タンク２内が満タンまで沸き上げられたことを貯湯温度センサ５で検出すると、貯湯制御手段２１は沸き上げ運転の停止を加熱制御手段２２に向けて指示し、加熱制御手段２２は圧縮機８、膨張弁１０、送風機１２、循環ポンプ１８の作動を停止して沸き上げ運転を停止するようにしている。   When the hot water storage temperature sensor 5 detects that the hot water storage tank 2 has been fully heated, the hot water storage control means 21 instructs the heating control means 22 to stop the heating operation, and the heating control means 22 The operations of the compressor 8, the expansion valve 10, the blower 12, and the circulation pump 18 are stopped to stop the boiling operation.

この沸き上げ運転を行っている最中に強い逆風が空気熱交換器１１に吹き付けた場合の作動について図２のタイムチャートに基づいて説明する。   The operation when a strong head wind blows to the air heat exchanger 11 during the boiling operation will be described based on the time chart of FIG.

沸き上げ運転中に逆風が吹き始めると（Ｔ１）、モータ負荷が増加するため送風機１２の回転数が指示回転数に対して低下し始める。そして、回転数センサ１３で検出する回転数が指示回転数よりも一定値以上下回ったことを検出すると（Ｔ２）、加熱制御手段２２（風向検知手段）は逆風状態であると判断し、加熱制御手段２２は送風機１２の駆動を停止し、圧縮機８の運転周波数を一定値だけ低下すると同時に、膨張弁１０の開度を一定開度だけ開く負荷軽減制御を行う。   When the back wind starts to blow during the boiling operation (T1), the motor load increases, so that the rotational speed of the blower 12 starts to decrease with respect to the indicated rotational speed. When it is detected that the rotational speed detected by the rotational speed sensor 13 is lower than the instruction rotational speed by a certain value or more (T2), it is determined that the heating control means 22 (wind direction detecting means) is in a headwind state, and the heating control is performed. The means 22 stops the driving of the blower 12 and lowers the operating frequency of the compressor 8 by a certain value, and at the same time performs load reduction control for opening the opening of the expansion valve 10 by a certain opening.

このとき、空気熱交換器１１を通過する風量が送風機１２による順風から送風機１２の停止に伴い無風状態を経過して逆風に移行するため、空気熱交換器１１での蒸発能力が一時的に極小となり空気熱交換器１１の出口冷媒密度は一時的に急上昇する。しかし、加熱制御手段２２が圧縮機８の運転周波数を低下し、膨張弁１０の開度を開く負荷軽減制御を行っているため、ヒートポンプ回路７の高圧側の圧力が低下し、圧縮機８の負荷の急上昇を抑制されるので、従来よりも圧縮機８の負荷オーバーによる異常停止が発生しにくい。   At this time, since the amount of air passing through the air heat exchanger 11 changes from normal wind by the blower 12 to the reverse wind through the stop of the blower 12 and then transitions to the reverse wind, the evaporation capacity in the air heat exchanger 11 is temporarily minimal. Then, the outlet refrigerant density of the air heat exchanger 11 temporarily increases rapidly. However, since the heating control means 22 performs load reduction control that lowers the operating frequency of the compressor 8 and opens the opening degree of the expansion valve 10, the pressure on the high pressure side of the heat pump circuit 7 is reduced, and the compressor 8 Since the sudden increase in the load is suppressed, the abnormal stop due to the overload of the compressor 8 is less likely to occur than in the past.

そして、逆風検知から所定の時間が経過すると（Ｔ３）、加熱制御手段は、逆風検知前の所定の加熱能力よりも一定値だけ加熱能力を低下する能力低下制御を開始する。このとき、加熱制御手段２２は低下された所定の加熱能力、所望の沸き上げ温度、逆風を検知する前に外気温度センサ１４で検出していた外気温度、および貯湯温度センサ５あるいは入水温度センサ１９で検出した入水温度に応じて新たな運転周波数を導出し、圧縮機８を新たな運転周波数で駆動する。このとき、加熱能力が低下されたことに伴い、膨張弁１０の開度もフィードバック制御により加熱能力低下前の開度よりも開き気味に制御されることとなる。   Then, when a predetermined time has elapsed since the detection of the back wind (T3), the heating control means starts a capability reduction control for reducing the heating capacity by a fixed value from the predetermined heating capacity before the detection of the back wind. At this time, the heating control means 22 reduces the predetermined heating capacity, the desired boiling temperature, the outside air temperature detected by the outside air temperature sensor 14 before detecting the back wind, and the hot water storage temperature sensor 5 or the incoming water temperature sensor 19. A new operation frequency is derived in accordance with the incoming water temperature detected in step S1, and the compressor 8 is driven at the new operation frequency. At this time, as the heating capacity is reduced, the opening degree of the expansion valve 10 is also controlled more openly than the opening degree before the heating capacity reduction by feedback control.

そして、能力低下制御中に逆風が弱まると（Ｔ４）、送風機１２の逆回転数が低下し始め、回転数センサ１３が所定の逆回転数以下まで低下したことを検出すると（Ｔ５）、加熱制御手段２２（風向検知手段）は逆風状態が解消されたと判断し、加熱制御手段２２は送風機１２の駆動を再開する。   When the reverse wind is weakened during the capacity reduction control (T4), the reverse rotation speed of the blower 12 starts to decrease, and when the rotation speed sensor 13 detects that the rotation speed sensor 13 has decreased below the predetermined reverse rotation speed (T5), the heating control is performed. The means 22 (wind direction detecting means) determines that the reverse wind state has been eliminated, and the heating control means 22 resumes driving of the blower 12.

そして、送風機１２の運転再開から所定時間が経過した時点（Ｔ６）で、加熱制御手段２２は能力低下制御を終了して逆風検知前の所定の加熱能力での通常運転に復帰するようにしている。   Then, at the time (T6) when a predetermined time has elapsed since the resumption of the operation of the blower 12, the heating control means 22 finishes the capacity reduction control and returns to the normal operation with the predetermined heating capacity before detecting the back wind. .

このとき、空気熱交換器１１を通過する風量が逆風から送風機１２の駆動再開に伴い無風状態を経過して順風に移行するため、空気熱交換器１１での蒸発能力が一時的に極小となり空気熱交換器１１の出口冷媒密度は一時的に急上昇する。しかし、加熱制御手段２２が加熱能力を低下させる能力低下制御を行っているため、ヒートポンプ回路７の高圧側の圧力が低下し、圧縮機８の負荷の急上昇が抑制される。さらには、送風機１２の駆動再開から所定時間経過後に元の加熱能力に戻すので、圧縮機８の負荷オーバーを防止することができ、異常停止の発生を防止することができる。   At this time, since the amount of air passing through the air heat exchanger 11 changes from the reverse wind to the normal wind after passing the no-wind state as the driving of the blower 12 resumes, the evaporation capacity in the air heat exchanger 11 is temporarily minimized and the air The outlet refrigerant density of the heat exchanger 11 temporarily rises rapidly. However, since the heating control means 22 performs the capability reduction control for reducing the heating capability, the pressure on the high pressure side of the heat pump circuit 7 is reduced, and the sudden increase in the load of the compressor 8 is suppressed. Furthermore, since the original heating capacity is restored after a lapse of a predetermined time since the driving of the blower 12 is resumed, it is possible to prevent the compressor 8 from being overloaded and to prevent an abnormal stop.

このように、順風から逆風への切り換わり時に空気熱交換器１１の蒸発能力が低下して圧縮機８に流入する冷媒密度が急激に上昇する際に、圧縮機８の運転周波数を低下するかまたは膨張弁１０の開度を開いて負荷を低減するので、高負荷によって運転停止に至る可能性を減少することができ、風向の安定しない状況においても安定的に給湯用の水を加熱する沸き上げ運転を行うことが可能となる。   In this way, when the evaporation capacity of the air heat exchanger 11 is reduced and the density of refrigerant flowing into the compressor 8 is rapidly increased when switching from the normal wind to the reverse wind, the operating frequency of the compressor 8 is reduced. Alternatively, since the opening of the expansion valve 10 is opened to reduce the load, the possibility that the operation is stopped due to a high load can be reduced, and the boiling water that stably heats hot water even in a situation where the wind direction is not stable. It is possible to perform a lifting operation.

また、逆風が収まって送風機１２を駆動再開した後に一時的に無風状態を経過するが、その際に、加熱能力が低減されているため負荷が小さく、圧縮機８に流入する冷媒密度が急激に上昇しても運転停止に至る可能性を減少することができ、風向の安定しない状況においても安定的に給湯用の水を加熱する沸き上げ運転を行うことが可能となる。   Moreover, after the headwind is settled and the blower 12 is restarted, the windless state temporarily passes. At that time, since the heating capacity is reduced, the load is small, and the refrigerant density flowing into the compressor 8 suddenly increases. Even if the temperature rises, the possibility of stopping the operation can be reduced, and even in a situation where the wind direction is not stable, it is possible to perform a boiling operation that stably heats water for hot water supply.

なお、本発明は上記の実施形態のみに限定されるものではなく、その趣旨を変更しない範囲で改変されても良いもので、例えば、風向検知手段として送風機１２の回転数センサ１３を用いた例を説明したが、これに代えて、外気温度センサ１４が逆風時に空気熱交換器１１で冷却された空気の温度を検出することを利用して、外気温度センサ１４を用いて風向検知手段を構成しても良いものである。   In addition, this invention is not limited only to said embodiment, In the range which does not change the meaning, you may modify | change, for example, the example which used the rotation speed sensor 13 of the air blower 12 as a wind direction detection means However, instead of this, the outside air temperature sensor 14 uses the outside air temperature sensor 14 to detect the temperature of the air cooled by the air heat exchanger 11 during the headwind. You can do it.

また、負荷軽減制御においては、圧縮機８の運転周波数を低下させると共に、膨張弁１０の開度を開くようにした例を説明したが、圧縮機８の運転周波数を低下させるのみの負荷軽減制御、あるいは、膨張弁１０の開度を開くのみの負荷軽減制御でも良いものである。   In the load reduction control, the example in which the operating frequency of the compressor 8 is reduced and the opening degree of the expansion valve 10 is opened has been described. However, the load reduction control only by reducing the operating frequency of the compressor 8 is described. Alternatively, load reduction control that only opens the opening of the expansion valve 10 may be used.

また、ヒートポンプ給湯機として貯湯タンク２を有した貯湯式のヒートポンプ給湯機を例に説明したが、これに限られず、例えば、貯湯タンク２のない瞬間式のヒートポンプ給湯機でも良いものである。   The hot water storage type heat pump water heater having the hot water storage tank 2 has been described as an example of the heat pump water heater. However, the present invention is not limited to this. For example, an instantaneous heat pump water heater without the hot water storage tank 2 may be used.

８ 圧縮機
９ 水熱交換器
１０ 膨張弁
１１ 空気熱交換器
１２ 送風機
１３ 回転数センサ（風向検知手段）
２２ 加熱制御手段（風向検知手段） 8 Compressor 9 Water heat exchanger 10 Expansion valve 11 Air heat exchanger 12 Blower 13 Rotational speed sensor (wind direction detecting means)
22 Heating control means (wind direction detection means)

Claims (3)

冷媒を圧縮して吐出する運転周波数の変更可能な圧縮機と、前記圧縮機からの冷媒と給湯用の水とを熱交換する水熱交換器と、前記水熱交換器からの冷媒を減圧膨張させる開度変更可能な膨張弁と、前記膨張弁からの低温低圧冷媒と空気とを熱交換する空気熱交換器と、前記空気熱交換器に空気を送風する送風機と、前記空気熱交換器への送風状態が逆風状態であることを検知する風向検知手段と、前記風向検知手段が逆風状態を検知すると、前記送風機の駆動を停止すると共に、前記圧縮機の運転周波数を低下する、および／または、前記膨張弁の開度を開くようにした負荷軽減制御を行うことを特徴とするヒートポンプ給湯機。   A compressor capable of changing the operating frequency for compressing and discharging the refrigerant, a water heat exchanger for exchanging heat between the refrigerant from the compressor and water for hot water supply, and decompressing and expanding the refrigerant from the water heat exchanger An expansion valve with variable opening, an air heat exchanger that exchanges heat between the low-temperature and low-pressure refrigerant from the expansion valve and air, a blower that blows air to the air heat exchanger, and the air heat exchanger And a wind direction detecting means for detecting that the air blowing state is a reverse wind state, and when the wind direction detecting means detects the head wind state, the driving of the blower is stopped and the operating frequency of the compressor is decreased, and / or The heat pump water heater is configured to perform load reduction control that opens the opening of the expansion valve. 前記負荷軽減制御に続いて、逆風状態を検知する前の加熱能力よりも加熱能力を低下する能力低下制御を行うと共に、前記風向検知手段が逆風状態の解消を検知すると、前記送風機の駆動を再開し、前記能力低下制御を終了して加熱能力を元に戻すようにしたことを特徴とする請求項１記載のヒートポンプ給湯機。   Following the load reduction control, the ability reduction control is performed to lower the heating ability than the heating ability before detecting the headwind condition, and when the wind direction detecting means detects the elimination of the headwind condition, the driving of the blower is resumed. The heat pump water heater according to claim 1, wherein the ability reduction control is terminated and the heating ability is restored. 前記風向検知手段は、前記送風機の回転数を検出する回転数センサを備え、この回転数センサで検出する前記送風機の回転数が目標回転数よりも一定回転数以上低い場合あるいは回転数センサが逆回転を検出している場合に、逆風状態であることを検知するようにしたことを特徴とする請求項２記載のヒートポンプ給湯機。   The wind direction detecting means includes a rotation speed sensor for detecting the rotation speed of the blower, and when the rotation speed of the blower detected by the rotation speed sensor is lower than a target rotation speed by a predetermined rotation speed or when the rotation speed sensor is reversed. 3. The heat pump water heater according to claim 2, wherein when the rotation is detected, it is detected that the wind is in a headwind state.
JP2010066081A 2010-03-23 2010-03-23 Heat pump water heater Pending JP2011196647A (en)

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WO2017065309A1 (en) * 2015-10-16 2017-04-20 ダイキン工業株式会社 Heat pump-type heating device

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JP2005241155A (en) * 2004-02-27 2005-09-08 Mitsubishi Electric Corp Air conditioner

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JPS60175953A (en) * 1984-02-22 1985-09-10 Matsushita Electric Ind Co Ltd Protective device for air conditioner from headwind
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Publication number Priority date Publication date Assignee Title
JP2016070619A (en) * 2014-09-30 2016-05-09 三菱重工業株式会社 Outdoor unit
WO2017065309A1 (en) * 2015-10-16 2017-04-20 ダイキン工業株式会社 Heat pump-type heating device
JP2017075763A (en) * 2015-10-16 2017-04-20 ダイキン工業株式会社 Heat pump type heating device
CN108139121A (en) * 2015-10-16 2018-06-08 大金工业株式会社 Heat-pump-type heating unit
CN108139121B (en) * 2015-10-16 2019-04-12 大金工业株式会社 Heat-pump-type heating device
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