JP2000346448A - Heat pump hot-water supplier - Google Patents
Heat pump hot-water supplierInfo
- Publication number
- JP2000346448A JP2000346448A JP15328199A JP15328199A JP2000346448A JP 2000346448 A JP2000346448 A JP 2000346448A JP 15328199 A JP15328199 A JP 15328199A JP 15328199 A JP15328199 A JP 15328199A JP 2000346448 A JP2000346448 A JP 2000346448A
- Authority
- JP
- Japan
- Prior art keywords
- discharge pressure
- air temperature
- outside air
- compressor
- reducing device
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は貯湯式のヒートポン
プ給湯機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply type heat pump water heater.
【０００２】[0002]
【従来の技術】従来のこの種のヒートポンプ給湯機は特
開昭６０−１６４１５７号公報に示すようなものがあ
る。図１０は従来のヒートポンプ給湯機の構成説明図で
ある。図１０において、圧縮機１、冷媒対水熱交換器
２、減圧装置３、蒸発器４からなる冷媒循環回路と、貯
湯槽５、循環ポンプ６、前記冷媒対水熱交換器２、補助
加熱器７を接続した給湯回路からなり前記圧縮機１より
吐出された高温高圧の過熱ガス冷媒は前記冷媒対水熱交
換器２に流入し、ここで前記循環ポンプ６から送られて
きた水を加熱する。そして、凝縮液化した冷媒は前記減
圧装置３で減圧され、前記蒸発器４に流入し、ここで大
気熱を吸熱して蒸発ガス化し、前記圧縮機１に戻る。一
方、前記冷媒対水熱交換器２で加熱された湯は前記貯湯
槽５の上部に流入し、上から次第に貯湯されていく。そ
して、前記冷媒対水熱交換器２の入口水温が設定値に達
すると水温度検出手段８が検知し、前記圧縮機１による
ヒートポンプ運転を停止して、前記補助加熱器７の単独
運転に切り換えるものである。2. Description of the Related Art A conventional heat pump water heater of this kind is disclosed in Japanese Patent Application Laid-Open No. 60-164157. FIG. 10 is a diagram illustrating the configuration of a conventional heat pump water heater. 10, a refrigerant circulation circuit including a compressor 1, a refrigerant / water heat exchanger 2, a pressure reducing device 3, and an evaporator 4, a hot water tank 5, a circulation pump 6, the refrigerant / water heat exchanger 2, an auxiliary heater The high-temperature and high-pressure superheated gas refrigerant discharged from the compressor 1 flows into the refrigerant-to-water heat exchanger 2 and heats the water sent from the circulation pump 6. . Then, the condensed and liquefied refrigerant is decompressed by the decompression device 3 and flows into the evaporator 4 where it absorbs atmospheric heat to evaporate and return to the compressor 1. On the other hand, the hot water heated by the refrigerant / water heat exchanger 2 flows into the upper portion of the hot water storage tank 5 and is gradually stored from above. When the inlet water temperature of the refrigerant-to-water heat exchanger 2 reaches a set value, the water temperature detecting means 8 detects the temperature, stops the heat pump operation by the compressor 1, and switches to the independent operation of the auxiliary heater 7. Things.
【０００３】[0003]
【発明が解決しようとする課題】上記図１０に示す従来
例のヒートポンプ給湯機では、減圧装置３としてキャピ
ラリーチューブや温度式膨張弁を用いていた。減圧装置
３としてキャピラリーチューブを用いる場合、一般的
に、冷媒循環量の多い夏季の温度条件を基準にキャピラ
リーチューブの仕様を設計する。そのため、夏季以外の
特に給湯負荷の大きい冬季には運転の効率が悪くなると
いう課題を有していた。また、同様に夏季以外の特に外
気温度の低い冬季には冷媒循環回路に必要以上の冷媒が
循環するため、圧縮機１に液冷媒が吸い込まれ、その結
果、液圧縮となり圧縮機の耐久性が悪くなるという課題
を有していた。In the conventional heat pump water heater shown in FIG. 10, a capillary tube or a thermal expansion valve is used as the pressure reducing device 3. When a capillary tube is used as the pressure reducing device 3, the specifications of the capillary tube are generally designed on the basis of summer temperature conditions where the refrigerant circulation amount is large. Therefore, there has been a problem that the operation efficiency is deteriorated especially in winter when the hot water supply load is large other than in summer. Similarly, in the winter season when the outside air temperature is low other than the summer season, more refrigerant than necessary is circulated in the refrigerant circulation circuit, so that the liquid refrigerant is sucked into the compressor 1, and as a result, the liquid is compressed and the durability of the compressor is reduced. There was a problem of getting worse.
【０００４】他方、減圧装置３として温度式膨張弁を用
いる場合、一般的に、蒸発器４の出口の冷媒は過熱度が
とれた過熱ガス状態となるように、減圧装置３としての
温度式膨張弁の仕様を設計する。そのため、設計した外
気温度よりも高い時には吐出圧力が上昇したり、外気温
度の低い冬季には吐出温度が上昇したりして圧縮機の耐
久性が悪くなるという課題を有していた。また、冬季に
おいて蒸発器４に着霜したときも、蒸発器４の出口の冷
媒状態を過熱度がとれるように制御するため、いっそう
着霜が進み、運転の効率が悪くなるという課題を有して
いた。On the other hand, when a temperature-type expansion valve is used as the pressure reducing device 3, generally, the refrigerant at the outlet of the evaporator 4 becomes a superheated gas state with a high degree of superheat, so that the temperature-dependent expansion valve as the pressure reducing device 3 is used. Design valve specifications. For this reason, there has been a problem that the discharge pressure increases when the temperature is higher than the designed outside air temperature, and the discharge temperature increases in winter when the outside air temperature is low, so that the durability of the compressor deteriorates. In addition, even when frost forms on the evaporator 4 in winter, the refrigerant at the outlet of the evaporator 4 is controlled so that the degree of superheat can be obtained. I was
【０００５】本発明の目的は圧縮機の異常温度上昇なら
びに異常圧力上昇がない、効率の良い給湯加熱運転を実
現することである。An object of the present invention is to realize an efficient hot water supply heating operation without an abnormal temperature rise and abnormal pressure rise of the compressor.
【０００６】[0006]
【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、圧縮機、冷媒対水熱交換器、減圧装置、蒸発
器を順次接続した冷媒循環回路と、貯湯槽、循環ポン
プ、前記冷媒対水熱交換器を順次接続した給湯回路と、
外気温度を検出する外気温度検出手段と、前記圧縮機の
吐出圧力を検出する吐出圧力検出手段と、圧縮機の吐出
圧力が外気温度に対して予め設定された目標吐出圧力に
なるように減圧装置の開度を制御する制御手段とを具備
したものである。According to the present invention, there is provided a refrigerant circuit having a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator connected in sequence, a hot water tank, a circulation pump, A hot water supply circuit in which refrigerant-to-water heat exchangers are sequentially connected,
An outside air temperature detecting means for detecting an outside air temperature, a discharge pressure detecting means for detecting a discharge pressure of the compressor, and a pressure reducing device so that a discharge pressure of the compressor becomes a preset target discharge pressure with respect to the outside air temperature. And a control means for controlling the opening degree.
【０００７】また、外気温度が高いときには、圧縮機の
吐出圧力が、吐出圧力検出手段からの信号によって予め
設定された常用最大吐出圧力を越えないように、減圧装
置の開度を制御する制御手段を具備したものである。When the outside air temperature is high, the control means controls the opening degree of the pressure reducing device so that the discharge pressure of the compressor does not exceed a normal maximum discharge pressure set in advance by a signal from the discharge pressure detecting means. It is provided with.
【０００８】また、外気温度が低いときには、圧縮機の
吐出圧力が、吐出圧力検出手段からの信号によって予め
設定された常用最大吐出温度を越えないように、減圧装
置の開度を制御する制御手段を具備したものである。When the outside air temperature is low, the control means controls the opening of the pressure reducing device so that the discharge pressure of the compressor does not exceed the normal maximum discharge temperature preset by a signal from the discharge pressure detecting means. It is provided with.
【０００９】上記発明において、外気温度に対して給湯
運転の効率が最も良い吐出圧力を予め求めておいて、こ
れを目標吐出圧力として設定する。そして、給湯運転を
行う場合に外気温度と圧縮機の吐出圧力とを検出して、
圧縮機の吐出圧力がこの目標吐出圧力になるように減圧
装置の開度を制御するので、年間を通じて、効率の良い
給湯加熱運転ができる。In the above invention, the discharge pressure at which the efficiency of the hot water supply operation is best with respect to the outside air temperature is determined in advance, and this is set as the target discharge pressure. Then, when performing the hot water supply operation, the outside air temperature and the discharge pressure of the compressor are detected,
Since the opening of the pressure reducing device is controlled so that the discharge pressure of the compressor becomes the target discharge pressure, an efficient hot water supply heating operation can be performed throughout the year.
【００１０】また、吐出圧力検出手段からの信号によっ
て、常用最大吐出圧力を越えないように、減圧装置の開
度を制御するので、圧縮機の異常圧力上昇がなく、さら
に、吐出圧力検出手段からの信号によって、常用最大吐
出温度を越えないように、減圧装置の開度を制御するの
で、圧縮機の異常温度上昇もない、耐久性の高いヒート
ポンプ給湯機が実現できる。Further, since the opening degree of the pressure reducing device is controlled by the signal from the discharge pressure detecting means so as not to exceed the normal maximum discharge pressure, there is no abnormal increase in the pressure of the compressor. Since the opening degree of the pressure reducing device is controlled so as not to exceed the normal maximum discharge temperature according to the signal, a highly durable heat pump water heater having no abnormal temperature rise of the compressor can be realized.
【００１１】[0011]
【発明の実施の形態】本発明は各請求項に記載の形態で
実施できるものであり、請求項１記載のように、圧縮
機、冷媒対水熱交換器、減圧装置、蒸発器を順次接続し
た冷媒循環回路と、貯湯槽、循環ポンプ、前記冷媒対水
熱交換器を順次接続した給湯回路と、外気温度を検出す
る外気温度検出手段と、前記圧縮機の吐出圧力を検出す
る吐出圧力検出手段と、圧縮機の吐出圧力が外気温度に
対して予め設定された目標吐出圧力になるように減圧装
置の開度を制御する制御手段とを設けた構成とすること
により、外気温度に対して給湯運転の効率が最も良い吐
出温度を予め求めておいて、これを目標吐出圧力として
設定するので、年間を通じて、効率の良い給湯加熱運転
ができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be carried out in the form described in each claim. As described in claim 1, a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected. Refrigerant circuit, a hot water tank, a circulation pump, a hot water supply circuit in which the refrigerant-to-water heat exchanger is sequentially connected, an outside air temperature detecting means for detecting an outside air temperature, and a discharge pressure detection for detecting a discharge pressure of the compressor. Means, and a control means for controlling the opening degree of the pressure reducing device so that the discharge pressure of the compressor becomes a target discharge pressure set in advance with respect to the outside air temperature. Since the discharge temperature at which the efficiency of hot water supply operation is the best is determined in advance, and this is set as the target discharge pressure, an efficient hot water supply heating operation can be performed throughout the year.
【００１２】また、請求項２記載のように、外気温度が
高いときには、圧縮機の吐出圧力が、吐出圧力検出手段
からの信号によって予め設定された常用最大吐出圧力を
越えないように、減圧装置の開度を制御する制御手段を
設けた構成とすることにより、圧縮機の異常圧力上昇が
ない、耐久性の高いヒートポンプ給湯機が実現できる。Further, when the outside air temperature is high, the discharge pressure of the compressor does not exceed the normal maximum discharge pressure set in advance by a signal from the discharge pressure detecting means. By providing a control means for controlling the opening of the compressor, a highly durable heat pump water heater having no abnormal pressure rise of the compressor can be realized.
【００１３】また、請求項３記載のように、外気温度が
低いときには、圧縮機の吐出圧力が、吐出圧力検出手段
からの信号によって予め設定された常用最大吐出温度を
越えないように、減圧装置の開度を制御する制御手段を
設けた構成とすることにより、圧縮機の異常温度上昇が
ない耐久性の高いヒートポンプ給湯機が実現できる。Further, when the outside air temperature is low, a pressure reducing device is provided so that the discharge pressure of the compressor does not exceed a normal maximum discharge temperature set in advance by a signal from the discharge pressure detecting means. By providing the control means for controlling the opening degree of the compressor, a heat pump water heater with high durability without abnormal temperature rise of the compressor can be realized.
【００１４】また、請求項４記載のように、減圧装置の
開度の下限値を有する制御手段を設けた構成とすること
により、着霜時にも減圧装置の最低の開度が維持される
ので、蒸発器４の蒸発温度の低下が押さえられて、従来
よりも効率の良い給湯加熱運転ができる。Further, by providing the control means having the lower limit value of the opening of the pressure reducing device, the minimum opening of the pressure reducing device is maintained even during frost formation. In addition, the decrease in the evaporation temperature of the evaporator 4 is suppressed, and the hot water supply heating operation can be performed more efficiently than in the past.
【００１５】[0015]
【実施例】以下、本発明の実施例について図面を用いて
説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１６】（実施例１）図１は本発明の実施例１のヒ
ートポンプ給湯機の構成説明図、図２は同ヒートポンプ
給湯機の減圧装置の開度に対する吐出温度と吐出圧力と
効率を示す説明図、図３は同ヒートポンプ給湯機の外気
温度に対する目標吐出圧力を示す説明図である。なお、
従来例で説明した図１０と同じ構成部材には同一符号を
用い説明を省略する。(Embodiment 1) FIG. 1 is an explanatory view showing the structure of a heat pump water heater according to Embodiment 1 of the present invention, and FIG. FIG. 3 and FIG. 3 are explanatory diagrams showing the target discharge pressure with respect to the outside air temperature of the heat pump water heater. In addition,
The same components as those in FIG. 10 described in the conventional example are denoted by the same reference numerals, and description thereof is omitted.
【００１７】図１において、冷媒対水熱交換器２の水側
出口に設けられた沸き上げ温度検出手段９からの信号で
回転数制御手段１０は循環ポンプ６の回転数を制御し
て、冷媒対水熱交換器２の出口水温（沸き上げ温度）を
ほぼ一定になるように沸き上げる。また、制御手段１１
は、外気温度を検出する外気温度検出手段１２と圧縮機
１の吐出圧力を検出する吐出圧力検出手段１３からの信
号で減圧装置３を制御する。１４は外気温度に対する目
標吐出圧力を記憶している第一の記憶手段である。な
お、減圧装置３として電動膨張弁（図示せず）等があ
る。In FIG. 1, a rotation speed control means 10 controls a rotation speed of a circulation pump 6 by a signal from a boiling temperature detecting means 9 provided at a water side outlet of the refrigerant-to-water heat exchanger 2. The water temperature (boiling temperature) at the outlet of the water heat exchanger 2 is raised so as to be substantially constant. The control means 11
Controls the pressure reducing device 3 with signals from the outside air temperature detecting means 12 for detecting the outside air temperature and the discharge pressure detecting means 13 for detecting the discharge pressure of the compressor 1. Reference numeral 14 denotes first storage means for storing a target discharge pressure with respect to the outside air temperature. The pressure reducing device 3 includes an electric expansion valve (not shown) and the like.
【００１８】次に動作、作用について説明する。Next, the operation and operation will be described.
【００１９】図２は横軸に減圧装置３の開度をとり、縦
軸に吐出温度と吐出圧力と効率をとって、ある外気温度
の時の減圧装置３の開度に対する吐出温度と吐出圧力と
効率の関係を示したものである。同図からわかるよう
に、効率は減圧装置３の開度に対して極大値がある。ま
た、同図において、一点鎖線は圧縮機の通常使用時の最
大温度である常用最大吐出温度を示しており、二点鎖線
は圧縮機の通常使用時の最大圧力である常用最大吐出圧
力を示している。ここで、効率が極大になる減圧装置３
の開度Ｘに対する吐出圧力を目標吐出圧力Ｙとする。そ
して、各外気温度に対して、この目標吐出圧力Ｙを求め
ると、図３のようになる。この外気温度に対する目標吐
出圧力の関係を第一の記憶手段１４に予め記憶させる。In FIG. 2, the horizontal axis indicates the opening degree of the pressure reducing device 3, and the vertical axis indicates the discharge temperature, the discharge pressure and the efficiency. The discharge temperature and the discharge pressure with respect to the opening degree of the pressure reducing device 3 at a certain outside air temperature. It shows the relationship between efficiency and efficiency. As can be seen from the figure, the efficiency has a maximum value with respect to the opening degree of the pressure reducing device 3. Also, in the same figure, the one-dot chain line indicates the normal maximum discharge temperature which is the maximum temperature during normal use of the compressor, and the two-dot chain line indicates the normal maximum discharge pressure which is the maximum pressure during normal use of the compressor. ing. Here, the decompression device 3 in which the efficiency is maximized
The discharge pressure with respect to the opening degree X is defined as a target discharge pressure Y. Then, when this target discharge pressure Y is obtained for each outside air temperature, it becomes as shown in FIG. The relationship between the outside air temperature and the target discharge pressure is stored in the first storage means 14 in advance.
【００２０】つまり、給湯運転が始まり圧縮機１が起動
すると、制御手段１１は外気温度検出手段１２と吐出圧
力検出手段１３からの信号で外気温度と吐出圧力と検出
する。そして、外気温度と目標吐出圧力との関係を記憶
している第一の記憶手段１４からの情報で、今の吐出圧
力が目標吐出圧力よりも高ければ、制御手段１１は減圧
装置３の開度を大きくする（開く方向）ように制御す
る。逆に、今の吐出圧力が目標吐出圧力よりも低けれ
ば、制御手段１１は減圧装置３の開度を小さくする（閉
じる方向）ように制御する。That is, when the hot water supply operation is started and the compressor 1 is started, the control means 11 detects the outside air temperature and the discharge pressure by the signals from the outside air temperature detecting means 12 and the discharge pressure detecting means 13. If the current discharge pressure is higher than the target discharge pressure based on information from the first storage means 14 that stores the relationship between the outside air temperature and the target discharge pressure, the control means 11 determines the opening degree of the pressure reducing device 3. Is controlled to be larger (opening direction). Conversely, if the current discharge pressure is lower than the target discharge pressure, the control means 11 controls the opening degree of the pressure reducing device 3 to be small (to close).
【００２１】上記のように、制御手段１１による吐出圧
力制御をある時間毎に行えば、外気温度が変化しても常
に効率の良い給湯運転が可能となる。As described above, if the discharge pressure control by the control means 11 is performed at certain intervals, a hot water supply operation can always be performed efficiently even if the outside air temperature changes.
【００２２】（実施例２）図４は本発明の実施例２のヒ
ートポンプ給湯機の減圧装置の開度に対する吐出温度と
吐出圧力と効率を示す説明図、図５は同ヒートポンプ給
湯機の外気温度に対する目標吐出圧力を示す説明図であ
る。(Embodiment 2) FIG. 4 is an explanatory view showing the discharge temperature, discharge pressure and efficiency with respect to the opening degree of a pressure reducing device of a heat pump water heater according to Embodiment 2 of the present invention, and FIG. 5 is the outside air temperature of the heat pump water heater. FIG. 4 is an explanatory diagram showing a target discharge pressure for the target.
【００２３】次に動作、作用について説明する。Next, the operation and operation will be described.
【００２４】図４は横軸に減圧装置３の開度をとり、縦
軸に吐出温度と吐出圧力と効率をとって、ある外気温度
の高い場合の減圧装置３の開度に対する吐出温度と吐出
圧力と効率の関係を示したものである。同図に示すよう
に、外気温度がかなり高くなると、効率が極大値になる
減圧装置３の開度において吐出圧力が常用最大吐出圧力
（例えば２．４ＭＰａ）を越えるときがある。この場
合、減圧装置３の開度をＡからＢに変更すると吐出圧力
はＣからＤに減少することになる。そこで、外気温度が
高いときには、目標吐出圧力の上限値を常用最大吐出圧
力とする。図５は横軸に外気温度をとり縦軸に目標吐出
圧力をとって、外気温度と目標吐出圧力との関係を示し
たものである。この関係を第一の記憶手段１４に予め記
憶させる。FIG. 4 shows the opening degree of the pressure reducing device 3 on the horizontal axis and the discharge temperature, the discharge pressure and the efficiency on the vertical axis, and shows the discharge temperature and discharge with respect to the opening degree of the pressure reducing device 3 when a certain outside air temperature is high. It shows the relationship between pressure and efficiency. As shown in the figure, when the outside air temperature becomes considerably high, the discharge pressure may exceed the normal maximum discharge pressure (for example, 2.4 MPa) at the opening degree of the pressure reducing device 3 at which the efficiency becomes a maximum value. In this case, when the opening of the pressure reducing device 3 is changed from A to B, the discharge pressure is reduced from C to D. Therefore, when the outside air temperature is high, the upper limit of the target discharge pressure is set as the normal maximum discharge pressure. FIG. 5 shows the relationship between the outside air temperature and the target discharge pressure by taking the outside air temperature on the horizontal axis and the target discharge pressure on the vertical axis. This relationship is stored in the first storage unit 14 in advance.
【００２５】つまり、給湯運転が始まり圧縮機１が起動
すると、制御手段１１は外気温度検出手段１２と吐出圧
力検出手段１３からの信号で外気温度と吐出圧力とを検
出し、そして、外気温度と目標吐出圧力との関係を記憶
している第一の記憶手段１４からの情報で、今の吐出圧
力が目標吐出圧力よりも高ければ、制御手段１１は減圧
装置３の開度を大きくする（開く方向）ように制御す
る。逆に、今の吐出圧力が目標吐出圧力よりも低けれ
ば、制御手段１１は減圧装置３の開度を小さくする（閉
じる方向）ように制御する。That is, when the hot water supply operation is started and the compressor 1 is started, the control means 11 detects the outside air temperature and the discharge pressure based on the signals from the outside air temperature detection means 12 and the discharge pressure detection means 13, and detects the outside air temperature and discharge pressure. If the current discharge pressure is higher than the target discharge pressure based on information from the first storage unit 14 that stores the relationship with the target discharge pressure, the control unit 11 increases the opening of the pressure reducing device 3 (opens). Direction). Conversely, if the current discharge pressure is lower than the target discharge pressure, the control means 11 controls the opening degree of the pressure reducing device 3 to be small (to close).
【００２６】このように吐出圧力が常用最大吐出圧力を
越えないようにすることができるので、異常圧力上昇の
ない給湯運転が可能となる。As described above, since the discharge pressure can be prevented from exceeding the normal maximum discharge pressure, a hot water supply operation without an abnormal pressure rise can be performed.
【００２７】（実施例３）図６は本発明の実施例３のヒ
ートポンプ給湯機の構成説明図、図７は同ヒートポンプ
給湯機の減圧装置の開度に対する吐出温度と吐出圧力と
効率を示す説明図、図８は同ヒートポンプ給湯機の外気
温度に対する目標吐出圧力を示す説明図である。(Embodiment 3) FIG. 6 is an explanatory view showing the structure of a heat pump water heater according to Embodiment 3 of the present invention, and FIG. FIG. 8 is an explanatory diagram showing a target discharge pressure with respect to the outside air temperature of the heat pump water heater.
【００２８】本実施例において、実施例１と異なる点
は、第二の記憶手段１５を設けた構成としている点であ
る。The present embodiment is different from the first embodiment in that the second storage means 15 is provided.
【００２９】なお、実施例１と同符号の部分は同一構成
を有し、説明は省略する。The parts denoted by the same reference numerals as in the first embodiment have the same configuration, and the description will be omitted.
【００３０】次に動作、作用について説明する。Next, the operation and operation will be described.
【００３１】図７は横軸に減圧装置３の開度をとり、縦
軸に吐出温度と吐出圧力と効率をとって、ある外気温度
の低い場合の減圧装置３の開度に対する吐出温度と吐出
圧力と効率の関係を示したものである。同図に示すよう
に、外気温度がかなり低くなると、効率が極大値になる
減圧装置３の開度において吐出温度が常用最大吐出温度
（例えば１０５゜Ｃ）を越えるときがある。この場合、
減圧装置３の開度をＡからＢに変更すると吐出温度はＣ
からＤに減少し、吐出圧力はＥからＦに減少する。結
局、同図に示す外気温度の場合には吐出温度をＤ（常用
最大吐出温度）にするためには吐出圧力をＦにすればよ
いことになる。この減圧装置３の開度Ｂに対する吐出圧
力を目標吐出圧力Ｚとする。そして、各外気温度に対し
て、この目標吐出圧力Ｚを求めると、図８の実線のよう
になる。この外気温度に対する目標吐出圧力Ｚの関係を
第二の記憶手段１５に予め記憶させる。同図において、
点線は常用最大吐出温度による制御を行わない場合であ
る。また、実線と点線の交点の外気温度を低温側限界外
気温度Ｔｌとする。FIG. 7 shows the opening degree of the pressure reducing device 3 on the horizontal axis and the discharge temperature, the discharge pressure and the efficiency on the vertical axis, and shows the discharge temperature and discharge with respect to the opening degree of the pressure reducing device 3 when a certain outside air temperature is low. It shows the relationship between pressure and efficiency. As shown in the figure, when the outside air temperature becomes considerably low, the discharge temperature sometimes exceeds the normal maximum discharge temperature (for example, 105 ° C.) at the opening degree of the pressure reducing device 3 at which the efficiency becomes a maximum value. in this case,
When the opening of the pressure reducing device 3 is changed from A to B, the discharge temperature becomes C
To D, and the discharge pressure decreases from E to F. After all, in the case of the outside air temperature shown in the figure, in order to set the discharge temperature to D (normal maximum discharge temperature), the discharge pressure should be set to F. The discharge pressure for the opening degree B of the pressure reducing device 3 is set as a target discharge pressure Z. Then, when this target discharge pressure Z is obtained for each outside air temperature, it becomes as shown by the solid line in FIG. The relationship between the target discharge pressure Z and the outside air temperature is stored in the second storage means 15 in advance. In the figure,
The dotted line indicates the case where the control based on the normal maximum discharge temperature is not performed. The outside air temperature at the intersection of the solid line and the dotted line is defined as the low-temperature-side limit outside air temperature Tl.
【００３２】つまり、給湯運転が始まり圧縮機１が起動
すると、制御手段１１は外気温度検出手段１２からの信
号で外気温度を検出する。この外気温度が低温側限界外
気温度Ｔｌよりも高ければ、さらに、制御手段１１は外
気温度検出手段１２と吐出圧力検出手段１３からの信号
で外気温度と吐出圧力とを検出し、そして、外気温度と
目標吐出圧力との関係を記憶している第一の記憶手段１
４からの情報で、今の吐出圧力が目標吐出圧力よりも高
ければ、制御手段１１は減圧装置３の開度を大きくする
（開く方向）ように制御する。逆に、今の吐出圧力が目
標吐出圧力よりも低ければ、制御手段１１は減圧装置３
の開度を小さくする（閉じる方向）ように制御する。That is, when the hot water supply operation is started and the compressor 1 is started, the control means 11 detects the outside air temperature based on a signal from the outside air temperature detection means 12. If this outside air temperature is higher than the lower limit side outside air temperature Tl, the control means 11 further detects the outside air temperature and the discharge pressure by the signals from the outside air temperature detection means 12 and the discharge pressure detection means 13, and Storage means 1 for storing the relationship between the pressure and the target discharge pressure
If the current discharge pressure is higher than the target discharge pressure based on the information from 4, the control unit 11 controls the pressure reducing device 3 to increase the opening degree (opening direction). Conversely, if the current discharge pressure is lower than the target discharge pressure, the control means 11
Is controlled so as to reduce the opening degree (close direction).
【００３３】他方、外気温度検出手段１２からの信号で
検出した外気温度が低温側限界外気温度Ｔｌよりも低け
れば、吐出圧力検出手段１３からの信号で吐出圧力を検
出し、そして、第二の記憶手段１５からの情報で、今の
吐出圧力が目標吐出圧力よりも高ければ、制御手段１１
は減圧装置３の開度を大きくする（開く方向）ように制
御する。逆に、今の吐出圧力が目標吐出圧力よりも低け
れば、制御手段１１は減圧装置３の開度を小さくする
（閉じる方向）ように制御する。On the other hand, if the outside air temperature detected by the signal from the outside air temperature detecting means 12 is lower than the low temperature limit outside air temperature Tl, the discharge pressure is detected by the signal from the discharge pressure detecting means 13 and If the current discharge pressure is higher than the target discharge pressure based on the information from the storage unit 15, the control unit 11
Is controlled to increase the opening of the pressure reducing device 3 (opening direction). Conversely, if the current discharge pressure is lower than the target discharge pressure, the control means 11 controls the opening degree of the pressure reducing device 3 to be small (to close).
【００３４】上記のように制御手段１１による吐出圧力
制御をある時間毎に行えば、吐出温度が常用最大吐出温
度を越えないようにすることができるので、異常温度上
昇のない給湯運転が可能となる。If the discharge pressure control by the control means 11 is performed at certain intervals as described above, the discharge temperature can be prevented from exceeding the normal maximum discharge temperature, so that the hot water supply operation without abnormal temperature rise can be performed. Become.
【００３５】（実施例４）図９は本発明の実施例４のヒ
ートポンプ給湯機の構成説明図である。(Embodiment 4) FIG. 9 is a structural explanatory view of a heat pump water heater according to Embodiment 4 of the present invention.
【００３６】本実施例において、実施例１と異なる点は
減圧装置３の最小開度を記憶している最小開度記憶手段
１６を設けた構成としている点である。The present embodiment is different from the first embodiment in that a minimum opening storage means 16 for storing the minimum opening of the pressure reducing device 3 is provided.
【００３７】なお、実施例１と同符号の部分は同一構成
を有し、説明は省略する。The parts having the same reference numerals as in the first embodiment have the same configuration, and the description will be omitted.
【００３８】次に動作、作用について説明する。Next, the operation and operation will be described.
【００３９】給湯運転が始まり圧縮機１が起動すると、
制御手段１１は外気温度検出手段１２と吐出圧力検出手
段１３からの信号で外気温度と吐出圧力とを検出する。
そして、外気温度と目標吐出圧力との関係を記憶してい
る第一の記憶手段１４からの情報で、今の吐出圧力が目
標吐出圧力よりも高ければ、制御手段１１は減圧装置３
の開度を大きくする（開く方向）ように制御する。逆
に、今の吐出圧力が目標吐出圧力よりも低ければ、制御
手段１１は最小開度記憶手段１６からの信号で得た減圧
装置３の最小開度と現在の減圧装置３の開度とを比較す
る。そして、現在の減圧装置３の開度のほうが前記最小
開度よりも大きければ、減圧装置３の開度を前記最小開
度を下まわらない範囲で小さくする（閉じる方向）よう
に制御する。また、現在の減圧装置３の開度のほうが前
記最小開度よりも小さいか等しければ、減圧装置３の開
度を前記最小開度になるように制御する。When the hot water supply operation is started and the compressor 1 is started,
The control means 11 detects the outside air temperature and the discharge pressure from signals from the outside air temperature detection means 12 and the discharge pressure detection means 13.
If the current discharge pressure is higher than the target discharge pressure based on information from the first storage means 14 which stores the relationship between the outside air temperature and the target discharge pressure, the control means 11 controls the pressure reducing device 3
Is controlled so as to increase the opening degree (opening direction). Conversely, if the current discharge pressure is lower than the target discharge pressure, the control means 11 compares the minimum opening degree of the pressure reducing device 3 obtained from the signal from the minimum opening degree storage means 16 with the current opening degree of the pressure reducing device 3. Compare. If the current opening of the pressure reducing device 3 is larger than the minimum opening, the opening of the pressure reducing device 3 is controlled to be reduced (closed direction) within a range not to be smaller than the minimum opening. If the current opening of the pressure reducing device 3 is smaller than or equal to the minimum opening, the opening of the pressure reducing device 3 is controlled to be the minimum opening.
【００４０】このようにすれば、外気温度が低い場合に
蒸発器４に霜が付着して蒸発温度が低下しても減圧装置
３の開度を必要以上に小さくすることがないので、効率
の良い給湯加熱運転が維持できる。In this way, even when frost adheres to the evaporator 4 when the outside air temperature is low and the evaporating temperature drops, the opening of the pressure reducing device 3 is not reduced unnecessarily. Good hot water supply heating operation can be maintained.
【００４１】[0041]
【発明の効果】以上説明したように本発明の請求項１に
係るヒートポンプ給湯機は、圧縮機、冷媒対水熱交換
器、減圧装置、蒸発器を順次接続した冷媒循環回路と、
貯湯槽、循環ポンプ、前記冷媒対水熱交換器を順次接続
した給湯回路と、外気温度を検出する外気温度検出手段
と、前記圧縮機の吐出圧力を検出する吐出圧力検出手段
と、圧縮機の吐出圧力が外気温度に対して予め設定され
た目標吐出圧力になるように減圧装置の開度を制御する
制御手段とを設けているので、年間を通じて、効率の良
い給湯加熱運転ができるという効果を有する。As described above, the heat pump water heater according to claim 1 of the present invention comprises a refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected;
A hot water tank, a circulation pump, a hot water supply circuit in which the refrigerant-to-water heat exchanger is sequentially connected, an outside air temperature detecting means for detecting an outside air temperature, a discharge pressure detecting means for detecting a discharge pressure of the compressor, and a compressor. The control means for controlling the opening degree of the pressure reducing device so that the discharge pressure becomes a target discharge pressure set in advance with respect to the outside air temperature is provided, so that an efficient hot water supply heating operation can be performed throughout the year. Have.
【００４２】また、請求項２に係るヒートポンプ給湯機
は、外気温度が高いときには、圧縮機の吐出圧力が、吐
出圧力検出手段からの信号によって予め設定された常用
最大吐出圧力を越えないように、減圧装置の開度を制御
する制御手段を設けているので、圧縮機の異常圧力上昇
がない、耐久性の高いヒートポンプ給湯機が実現できる
という効果を有する。Further, the heat pump water heater according to claim 2 is arranged such that when the outside air temperature is high, the discharge pressure of the compressor does not exceed the normal maximum discharge pressure set in advance by a signal from the discharge pressure detecting means. Since the control means for controlling the opening degree of the pressure reducing device is provided, there is an effect that a highly durable heat pump water heater can be realized without an abnormal pressure increase of the compressor.
【００４３】また、請求項３に係るヒートポンプ給湯機
は、外気温度が低いときには、圧縮機の吐出圧力が、吐
出圧力検出手段からの信号によって予め設定された常用
最大吐出温度を越えないように、減圧装置の開度を制御
する制御手段を設けているので、圧縮機の異常温度上昇
がなく、また、液圧縮のない耐久性の高いヒートポンプ
給湯機が実現できるという効果を有する。In the heat pump water heater according to the third aspect, when the outside air temperature is low, the discharge pressure of the compressor does not exceed the ordinary maximum discharge temperature set in advance by a signal from the discharge pressure detecting means. Since the control means for controlling the degree of opening of the decompression device is provided, there is an effect that there is no abnormal temperature rise of the compressor and a highly durable heat pump water heater without liquid compression can be realized.
【００４４】また、請求項４に係るヒートポンプ給湯機
は、、減圧装置の開度の下限値を有する制御手段を設け
ているので、着霜時にも減圧装置の最低の開度が維持さ
れるため、蒸発器４の蒸発温度の低下が押さえられて、
従来よりも効率の良い給湯加熱運転ができる。Further, the heat pump water heater according to claim 4 is provided with the control means having the lower limit of the opening of the pressure reducing device, so that the minimum opening of the pressure reducing device is maintained even when frost is formed. , The decrease in the evaporation temperature of the evaporator 4 is suppressed,
Hot water supply heating operation can be performed more efficiently than before.
【図１】本発明の実施例１のヒートポンプ給湯機を示す
構成説明図FIG. 1 is a configuration explanatory view showing a heat pump water heater according to a first embodiment of the present invention.
【図２】同ヒートポンプ給湯機の減圧装置の開度に対す
る吐出温度と吐出圧力と効率を示す説明図FIG. 2 is an explanatory diagram showing discharge temperature, discharge pressure, and efficiency with respect to an opening degree of a pressure reducing device of the heat pump water heater.
【図３】同ヒートポンプ給湯機の外気温度に対する目標
吐出圧力を示す説明図FIG. 3 is an explanatory diagram showing a target discharge pressure with respect to an outside air temperature of the heat pump water heater.
【図４】本発明の実施例２のヒートポンプ給湯機の減圧
装置の開度に対する吐出温度と吐出圧力と効率を示す説
明図FIG. 4 is an explanatory diagram showing a discharge temperature, a discharge pressure, and an efficiency with respect to an opening degree of a pressure reducing device of a heat pump water heater according to a second embodiment of the present invention.
【図５】同ヒートポンプ給湯機の外気温度に対する目標
吐出圧力を示す説明図FIG. 5 is an explanatory diagram showing a target discharge pressure with respect to an outside air temperature of the heat pump water heater.
【図６】本発明の実施例３のヒートポンプ給湯機の構成
説明図FIG. 6 is a configuration explanatory view of a heat pump water heater according to a third embodiment of the present invention.
【図７】同ヒートポンプ給湯機の減圧装置の開度に対す
る吐出温度と吐出圧力と効率を示す説明図FIG. 7 is an explanatory diagram showing discharge temperature, discharge pressure, and efficiency with respect to the opening degree of the pressure reducing device of the heat pump water heater.
【図８】同ヒートポンプ給湯機の外気温度に対する目標
吐出圧力を示す説明図FIG. 8 is an explanatory diagram showing a target discharge pressure with respect to an outside air temperature of the heat pump water heater.
【図９】本発明の実施例４のヒートポンプ給湯機の構成
説明図FIG. 9 is a configuration explanatory view of a heat pump water heater according to Embodiment 4 of the present invention.
【図１０】従来例におけるヒートポンプ給湯機の構成説
明図FIG. 10 is a diagram illustrating the configuration of a conventional heat pump water heater.
１ 圧縮機 ２ 冷媒対水熱交換器 ３ 減圧装置 ４ 蒸発器 ５ 貯湯槽 ６ 循環ポンプ １１ 制御手段 １２ 外気温度検出手段 １３ 吐出圧力検出手段 １４ 第一の記憶手段 １５ 第二の記憶手段 １６ 最小開度記憶手段 DESCRIPTION OF SYMBOLS 1 Compressor 2 Refrigerant-water heat exchanger 3 Decompression device 4 Evaporator 5 Hot water storage tank 6 Circulation pump 11 Control means 12 Outside air temperature detection means 13 Discharge pressure detection means 14 First storage means 15 Second storage means 16 Minimum opening Degree storage means
Claims (4)
発器を順次接続した冷媒循環回路と、貯湯槽、循環ポン
プ、前記冷媒対水熱交換器を順次接続した給湯回路と、
外気温度を検出する外気温度検出手段と、前記圧縮機の
吐出圧力を検出する吐出圧力検出手段と、圧縮機の吐出
圧力が外気温度に対して予め設定された目標吐出圧力に
なるように減圧装置の開度を制御する制御手段とを備え
ていることを特徴とするヒートポンプ給湯機。1. A refrigerant circuit in which a compressor, a refrigerant-to-water heat exchanger, a decompression device, and an evaporator are sequentially connected; a hot water tank, a circulation pump, and a hot-water supply circuit in which the refrigerant-to-water heat exchanger is sequentially connected;
An outside air temperature detecting means for detecting an outside air temperature, a discharge pressure detecting means for detecting a discharge pressure of the compressor, and a pressure reducing device so that a discharge pressure of the compressor becomes a preset target discharge pressure with respect to the outside air temperature. And a control means for controlling the opening of the heat pump water heater.
力が、吐出圧力検出手段からの信号によって予め設定さ
れた常用最大吐出圧力を越えないように、減圧装置の開
度を制御する制御手段を備えていることを特徴とする請
求項１記載のヒートポンプ給湯機。2. The control means for controlling the opening of the pressure reducing device so that the discharge pressure of the compressor does not exceed a normal maximum discharge pressure set in advance by a signal from the discharge pressure detecting means when the outside air temperature is high. The heat pump water heater according to claim 1, further comprising:
力が、吐出圧力検出手段からの信号によって予め設定さ
れた常用最大吐出温度を越えないように、減圧装置の開
度を制御する制御手段を備えていることを特徴とする請
求項１記載のヒートポンプ給湯機。3. A control means for controlling the degree of opening of the pressure reducing device such that the discharge pressure of the compressor does not exceed a normal maximum discharge temperature preset by a signal from the discharge pressure detecting means when the outside air temperature is low. The heat pump water heater according to claim 1, further comprising:
を備えていることを特徴とする請求項１記載のヒートポ
ンプ給湯機。4. The heat pump water heater according to claim 1, further comprising control means having a lower limit value of the degree of opening of the pressure reducing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15328199A JP3700474B2 (en) | 1999-06-01 | 1999-06-01 | Heat pump water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15328199A JP3700474B2 (en) | 1999-06-01 | 1999-06-01 | Heat pump water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000346448A true JP2000346448A (en) | 2000-12-15 |
| JP3700474B2 JP3700474B2 (en) | 2005-09-28 |
Family
ID=15559051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15328199A Expired - Fee Related JP3700474B2 (en) | 1999-06-01 | 1999-06-01 | Heat pump water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3700474B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003090631A (en) * | 2001-09-13 | 2003-03-28 | Sanyo Electric Co Ltd | Heat pump type water heater |
| WO2005059448A2 (en) | 2003-12-17 | 2005-06-30 | Carrier Corporation | Transcritical vapor compression optimization through maximization of heating capacity |
| JP2007271214A (en) * | 2006-03-31 | 2007-10-18 | Daikin Ind Ltd | Refrigerating device |
| US7458418B2 (en) | 2003-01-13 | 2008-12-02 | Carrier Corporation | Storage tank for hot water systems |
| JP2011007457A (en) * | 2009-06-29 | 2011-01-13 | Denso Corp | Heat pump type water heater |
| JP2013160490A (en) * | 2012-02-09 | 2013-08-19 | Hitachi Appliances Inc | Heat pump type water heater |
| WO2018155428A1 (en) * | 2017-02-21 | 2018-08-30 | 株式会社前川製作所 | Heat pump device control method and heat pump device |
| WO2018155429A1 (en) * | 2017-02-21 | 2018-08-30 | 株式会社前川製作所 | Heat pump device control method and heat pump device |
| CN113432298A (en) * | 2021-06-28 | 2021-09-24 | 珠海格力电器股份有限公司 | Control method and device of compression system and air-source heat pump water heater |
-
1999
- 1999-06-01 JP JP15328199A patent/JP3700474B2/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4693308B2 (en) * | 2001-09-13 | 2011-06-01 | 三洋電機株式会社 | Heat pump type water heater |
| JP2003090631A (en) * | 2001-09-13 | 2003-03-28 | Sanyo Electric Co Ltd | Heat pump type water heater |
| US7458418B2 (en) | 2003-01-13 | 2008-12-02 | Carrier Corporation | Storage tank for hot water systems |
| EP1709373A4 (en) * | 2003-12-17 | 2009-07-29 | Carrier Corp | Transcritical vapor compression optimization through maximization of heating capacity |
| EP1709373A2 (en) * | 2003-12-17 | 2006-10-11 | Carrier Corporation | Transcritical vapor compression optimization through maximization of heating capacity |
| US7051542B2 (en) | 2003-12-17 | 2006-05-30 | Carrier Corporation | Transcritical vapor compression optimization through maximization of heating capacity |
| WO2005059448A2 (en) | 2003-12-17 | 2005-06-30 | Carrier Corporation | Transcritical vapor compression optimization through maximization of heating capacity |
| JP2007271214A (en) * | 2006-03-31 | 2007-10-18 | Daikin Ind Ltd | Refrigerating device |
| JP2011007457A (en) * | 2009-06-29 | 2011-01-13 | Denso Corp | Heat pump type water heater |
| JP2013160490A (en) * | 2012-02-09 | 2013-08-19 | Hitachi Appliances Inc | Heat pump type water heater |
| WO2018155428A1 (en) * | 2017-02-21 | 2018-08-30 | 株式会社前川製作所 | Heat pump device control method and heat pump device |
| WO2018155429A1 (en) * | 2017-02-21 | 2018-08-30 | 株式会社前川製作所 | Heat pump device control method and heat pump device |
| CN113432298A (en) * | 2021-06-28 | 2021-09-24 | 珠海格力电器股份有限公司 | Control method and device of compression system and air-source heat pump water heater |
| CN113432298B (en) * | 2021-06-28 | 2022-03-22 | 珠海格力电器股份有限公司 | Control method and device of compression system and air-source heat pump water heater |
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| Publication number | Publication date |
|---|---|
| JP3700474B2 (en) | 2005-09-28 |
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