JP2008256346A - Heat pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly efficient heat pump device using a heat pump cycle for actualizing operation of heating supply hot water without a risk that hot water runs out, even during bath heating operation (or heating operation) while minimizing heat release loss due to natural convection in a hot water storage tank. <P>SOLUTION: The heat pump device comprises the heat pump cycle 6, the hot water storage tank 7, a supply hot water upper circuit 10 for returning supply hot water heated by a hot water supply heat exchanger 2 to the upper part of the hot water storage tank 7, a supply hot water lower circuit 11 for returning the supply hot water heated by the hot water supply heat exchanger 2 to the lower part of the hot water storage tank 7, a water channel selecting means 12 for selecting the supply hot water upper circuit 10 or the supply hot water lower circuit 11, a bath heat exchanger 15 for making heat exchange between the supply hot water in the hot water storage tank 7 and bathtub water, a back flow preventing means 23 for preventing the back flow of hot water, and a bathtub water heating circuit 17 connected to the hot water storage tank 7, the back flow preventing means 23 and the bath heat exchanger 15, in sequence. The bathtub water heating circuit 17 is connected at its downstream side to the supply hot water lower circuit 11 via the back flow preventing means 23. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water supply heat exchanger and a heat pump device including a bath heat exchanger.

Conventionally, a heat pump type hot water heater using a refrigeration cycle has been proposed. For example, as shown in FIG. 8, a heat pump cycle comprising a compressor 1, a hot water heat exchanger 2, a decompression means 3, an evaporator 4 and the like. 6 is used to store hot water in the hot water storage tank 7, heat the heated hot water or bathtub water through the bath heat exchanger 15, and supply hot water or heat (bath heating). (For example, refer to Patent Document 1).
JP 2003-222395 A

  However, in the above-described conventional configuration, hot hot water stored in the hot water storage tank 7 flows into the bathtub water heating circuit 17 by natural convection and dissipates heat through the pipe line, the heat exchanger, or the mixing valve that communicates therewith. The equipment efficiency was reduced. In addition, when hot hot water flows into the bath heat exchanger 15 by natural convection, bath water or the like, which is a medium to be heated by the bath heat exchanger 15, is heated to a high temperature. If the bathtub water flows into the bathtub while being heated to a high temperature, the user is uncomfortable.

  In addition, when a heating operation (or bath heating operation) is performed to switch between a circuit for returning heated hot water to the hot water storage tank and a circuit for returning hot water from the heat pump cycle to the hot water storage tank using a water channel switching valve. In addition, since the heating operation of the hot water supply by the heat pump cycle cannot be performed, the temperature of the hot water in the hot water storage tank is lowered during the heating operation, so that the hot water supply cannot be performed (hot water shortage).

  Accordingly, the present invention solves the above-described conventional problems, and minimizes heat dissipation loss due to natural convection of a hot water storage tank, and even when performing a bath heating operation (or heating operation), hot water supply water by a heat pump cycle It is an object of the present invention to provide a highly efficient heat pump device that can perform the heating operation without fear of running out of hot water.

  In order to solve the above-described conventional problems, the heat pump device of the present invention includes a compressor, a hot water supply heat exchanger, a decompression unit, a heat pump cycle in which an evaporator is connected in a ring shape with a refrigerant circuit, a hot water storage tank, and the hot water supply heat exchange. A hot water supply upper circuit for returning hot water heated by a heater to the upper part of the hot water storage tank, a hot water lower circuit for returning hot water heated by the hot water heat exchanger to the lower part of the hot water storage tank, and the hot water upper circuit And water channel switching means for switching the hot water supply lower circuit, a bath heat exchanger for exchanging heat between hot water and bathtub water in the hot water storage tank, check means for preventing back flow of hot water, the hot water storage tank, and the check And a bath water heating circuit that is connected in the order of the bath heat exchanger, and the downstream side of the check means of the bath water heating circuit is connected to the hot water supply lower circuit. So this Therefore, it is possible to prevent the hot water in the hot water tank from flowing into the bathtub water heating circuit due to natural convection and to return the hot water heated in the bath and the hot water heated in the heat pump cycle to the hot water tank from the hot water lower circuit at the same time. It becomes.

According to the present invention, inflow to the bathtub water heating circuit due to natural convection of hot water in the hot water storage tank is suppressed to reduce heat loss from the hot water in the hot water storage tank, and a bath heating operation (or heating operation) is performed. Even when it is, it can be set as the heat pump apparatus with high operating efficiency which can perform the heating operation of the hot-water supply by a heat pump cycle, and there is no worry of running out of hot water.

  A first aspect of the present invention is a heat pump cycle in which a compressor, a hot water supply heat exchanger, a decompression unit, and an evaporator are connected in a ring shape with a refrigerant circuit, a hot water storage tank, and hot water heated by the hot water supply heat exchanger. A hot water supply upper circuit for returning to the upper part, a hot water lower circuit for returning the hot water heated by the hot water heat exchanger to the lower part of the hot water storage tank, and a water channel switching means for switching between the hot water upper circuit and the hot water lower circuit. And a bath heat exchanger for exchanging heat between hot water and bathtub water in the hot water storage tank, a check means for preventing back flow of hot water, the hot water storage tank, the check means, and the bath heat exchanger in this order. A heat pump device comprising: a bathtub water heating circuit; and a downstream side of the non-return means of the bathtub water heating circuit connected to the hot water supply lower circuit. Flow resistance (valve Spring pressure) to prevent natural convection of hot water from the hot water storage tank to the downstream side of the bath water heating circuit, and the bath water heating circuit has a check means and is connected to the hot water lower circuit. Because it is a circuit that returns hot water heated from the heat pump cycle and hot water heated from the heat pump cycle to the hot water storage tank from the lower hot water circuit to the hot water storage tank. Even so, it is possible to perform the heating operation of the hot water supply water, and it is possible to provide a heat pump device with high operation efficiency without fear of running out of hot water.

  2nd invention is arrange | positioned in the bathtub water pouring circuit which pours the hot water of a hot water storage tank into a bathtub, and the said bath water pouring circuit, and mixes tap water and the hot water of a hot water storage tank so that it may become predetermined | prescribed temperature And the upstream side of the bathtub water pouring circuit is connected to the downstream side of the non-return means of the bathtub water heating circuit. The flow resistance of the means (spring pressure holding the valve element) can prevent the hot water in the hot water tank from flowing into the mixing valve due to natural convection, so the hot water in the hot water tank is poured into the bathtub. The pouring temperature of hot water immediately after the hot water operation is started can be stabilized.

  3rd invention is equipped with the bathtub water heating pump which conveys the hot-water supply water of a hot water storage tank to a bath heat exchanger, It changes the output of the said bathtub water heating pump, It is characterized by the above-mentioned. Since it is possible to variably control the flow rate of hot water to heat the water, it is possible to control the temperature of the bath water that returns to the bathtub and the temperature of the hot water that returns to the hot water storage tank. It can be a device.

  4th invention is equipped with the bathtub water heating pump which conveys the hot water of a hot water storage tank to a bath heat exchanger, and the hot water water pump which conveys the hot water of a hot water storage tank to a hot water heat exchanger, Based on the output, the output of the hot water pump is changed, and the output of the hot water pump is corrected in accordance with the flow rate of the hot water for heating the bath water, and the flow rate of the hot water pump is changed. It becomes possible to perform control which suppresses, and it can be set as a heat pump apparatus with high operating efficiency.

  5th invention is equipped with the temperature detection means which detects the temperature of the exit of a hot-water supply heat exchanger, and changes the output of a hot-water supply water pump based on the detected value of the said temperature detection means, and the output of a bathtub water heating pump. According to the flow rate of hot water for heating the bathtub water and the temperature of the hot water, the operation control of the water channel switching means and the output of the hot water pump are corrected, and the flow rate of the hot water pump It is possible to perform control that suppresses fluctuations, and a heat pump device with high operating efficiency can be obtained.

The sixth invention is characterized in that the hot water supply upper circuit is connected to the bathtub water heating circuit. Since the heated hot water is directly used for heating the bathtub water, the hot water tank is stored. In addition to reducing the mixing loss with the existing water, it is possible to reduce the connection piping between the hot water supply upper circuit and the hot water storage tank, and the parts such as the connection ports, so that a heat pump device with high operating efficiency and low cost can be obtained.

  A seventh invention includes a bathtub water heating pump that conveys hot water in a hot water storage tank to a bath heat exchanger and a hot water pump that conveys hot water in a hot water storage tank to a hot water heat exchanger, It is characterized by changing the output of the hot water pump based on the output, and heating the bathtub water at the same time with the output of the hot water pump can suppress the output of the bathtub water pump. A heat pump device with high efficiency can be obtained.

  The eighth invention is characterized in that carbon dioxide is used as a refrigerant and is operated in a supercritical pressure state on the high-pressure side, so that the heat pump device can be used at a high temperature and the hot water storage function and the boiling function are improved. can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a heat pump apparatus according to a first embodiment of the present invention.

  In FIG. 1, a compressor 1, a hot water supply heat exchanger 2, a decompression unit 3, and an evaporator 4 are sequentially connected in an annular manner by a refrigerant circuit 5 to constitute a heat pump cycle 6. On the other hand, the hot water storage tank 7 stores hot water, and the hot water circuit 9 connects the hot water storage tank 7, the hot water pump 8, the hot water heat exchanger 2, and the water channel switching means 12 in this order. When the hot water flowing out of the hot water heat exchanger 2 is returned to the upper part of the hot water storage tank 7, the hot water is supplied to the lower part of the hot water storage tank 7 through the hot water upper circuit 10 connecting the water channel switching means 12 and the upper part of the hot water storage tank 7. In the case of returning to the normal temperature, the hot water supply lower circuit 11 connecting the water channel switching means 12 and the lower part of the hot water storage tank 7 is passed.

  Therefore, by controlling the operation of the water channel switching means 12, it is possible to selectively switch the position where the hot water flowing out from the heat pump cycle 6 is returned to either the upper part or the lower part of the hot water storage tank 7. Furthermore, the hot water storage tank 7 is provided with a bathtub water heating circuit 17 for connecting the check means 23, the bath heat exchanger 15, and the bathtub water heating pump 16 in order, and the downstream end of the bathtub water heating means 17 is hot water supply water. It is connected to the lower circuit 11.

  Moreover, the bathtub 22 is connected to the other circuit of the bath heat exchanger 15, and the bathtub water circuit 18 which connects the bathtub water pump 18 which conveys bathtub water, the bathtub 22, the bathtub water pump 18, and the bath heat exchanger 15 in order. Is configured. The bathtub water pouring circuit 24 is a circuit for pouring hot water in the hot water storage tank 7 to the bathtub 22 via the bathtub water circuit 19, and a mixing valve 25 for mixing hot hot water in the hot water tank 7 and tap water. A temperature detecting means 26 for detecting the temperature of the hot water to be poured and a circuit on / off valve 27 for opening and closing the bathtub water pouring circuit 24 are provided, and the hot water supply cycle 20 is configured including these. The check means 23 is installed in such a direction as to prevent hot water returning from the hot water lower circuit 11 to the hot water storage tank 7 from flowing back through the bathtub water heating circuit 17.

  The check means 23 has a structure in which a valve body and a spring are incorporated and the valve body is held by spring pressure. In the forward flow of the check means 23, a water pressure exceeding the spring pressure holding the valve body is generated. Only when this occurs, a flow passing through the check means 23 is generated.

  Below, operation | movement and an effect | action of the heat pump apparatus by this Embodiment are demonstrated.

  The operation of heating the hot water stored in the hot water storage tank 7 in the heat pump cycle 6 is as follows. Hot water in the hot water storage tank 7 is conveyed to the hot water supply heat exchanger 12 by the hot water pump 8 and heated by the heat pump cycle operation of the heat pump cycle 6. In order to increase the temperature of the hot water stored in the hot water storage tank 7, the hot water is stored in the hot water lower circuit 11 until the temperature of the hot water heated by the hot water heat exchanger 12 exceeds a predetermined temperature. Returning to the tank 7, when the temperature reaches a predetermined temperature or higher, the water channel switching means 12 is operated to return the hot water to the hot water storage tank 7 from the hot water upper circuit 10. The hot water supply pump 8 controls the flow rate of the hot water supply circuit 9 so that the temperature of the hot water heated by the hot water supply heat exchanger 12 becomes a predetermined temperature.

  The pouring (hot water filling) to the bathtub 22 and the heating of the bathtub water are as follows. The mixing valve 25 of the bathtub water pouring circuit 24 adjusts the mixing ratio of hot water and tap water so that the pouring temperature detected by the temperature detecting means 26 becomes a temperature preset by a remote controller or the like (not shown). To do. The bathtub water having a predetermined temperature flows out from the bathtub water circuit 19 to the bathtub 22.

  On the other hand, when the bathtub water in the bathtub 22 is heated, the hot water supply water stored in the hot water storage tank 7 is conveyed to the bath heat exchanger 15 by the bathtub water heating pump 16, and the bathtub conveyed from the bathtub water pump 18. Heat the water. The hot-water supply water whose temperature has been lowered by heating the bath water in the bath heat exchanger 15 flows into the interior from the lower part of the hot-water storage tank 7 to which the hot-water supply lower circuit 11 is connected.

  In the case where the hot water supply heating operation is performed when the bath water heating operation is not performed, the hot water is supplied to the lower part of the hot water supply until the temperature of the hot water heated by the hot water supply heat exchanger 12 exceeds a predetermined temperature. Although it returns to the hot water storage tank 7 from the circuit 11, hot water flows into the bathtub water heating circuit 17, but since the check means 23 is provided, the hot water flows backward through the bathtub water heating circuit 17 from the upper part of the hot water tank 7. It can be prevented from returning.

  In addition, when the bath water heating operation is performed when the hot water heating operation is not performed, the hot water heated by the bath heat exchanger 15 is returned from the hot water lower circuit 11 to the hot water storage tank 7. Since the water channel switching means 12 is provided, hot water can be prevented from flowing back through the hot water lower circuit 11 and returning from the upper part of the hot water storage tank 7. Further, when the bath water heating operation is performed, the hot water is returned from the hot water lower circuit 11 to the hot water storage tank 7 until the temperature of the hot water heated by the hot water heat exchanger 12 becomes a predetermined temperature or higher. Driving is also possible.

  Therefore, the bath water heating operation and the hot water heating operation can be performed at the same time, and even if the bath water heating operation is performed, a heat pump device that does not worry about running out of hot water can be obtained.

  On the other hand, hot hot water stored in the hot water storage tank 7 flows into the bathtub water heating circuit 17 connected to the upper part of the hot water storage tank 7 by natural convection, but the spring pressure that holds the valve body of the check means 23. Therefore, the flow to the downstream side of the bathtub water heating circuit 17 by natural convection can be prevented. Therefore, heat loss due to inflow of hot hot water into the bath heat exchanger 15 can be prevented. Moreover, since it can prevent that the bathtub water currently stopped at the bath heat exchanger 15 becomes high temperature, it can prevent the phenomenon where hot bathtub water flows into the bathtub 22 at the time of the bathtub water heating operation start beforehand. I can do it.

  The hot water stored in the hot water storage tank 7 is mixed with the mixing valve 25 or the temperature detecting means via the bathtub water heating circuit 17 and the bathtub water pouring circuit 24 connected to the upper part of the hot water storage tank 7. When natural convection flows into the position 26, the temperature detecting means 26 detects a high temperature at the start of pouring and controls the mixing ratio of the mixing valve 25. Therefore, overshooting or undershooting occurs with respect to the set temperature. It takes time until the temperature of the hot water supplied to the bathtub 22 is stabilized.

  Therefore, the spring pressure that holds the valve body of the check means 23 can prevent the downstream flow of the bathtub water heating circuit 17 due to natural convection. Accordingly, since hot hot water can be prevented from flowing into the mixing valve 25, overshoot or undershoot is suppressed with respect to the set temperature, and the hot water temperature set in a short period of time causes the hot water to flow into the bathtub. 22 can be supplied.

  In the present embodiment, the object to be heated with the hot water in the hot water storage tank 7 is the bath water, but it is also possible to use the circulating water for heating shown in the conventional example. The heat pump device can be used without worrying about running out of hot water.

  In FIG. 2, the operation control means 28 is a control means for controlling the outputs of the hot water supply pump 8 and the bath water heating pump 16, and the hot water supply pump 8 is a temperature detector installed at the outlet of the hot water supply heat exchanger 2. The temperature of the hot water detected by the means 29 is controlled to be a predetermined temperature. The bathtub water heating pump 16 is configured to vary the flow rate of hot water flowing into the bath heat exchanger 15 by controlling its output. The bath water heating operation according to the convenience of the user by varying the hot water flow rate based on the amount of heat for heating the bath water set by the user in the operation control means 28 and the temperature of the bath water returning to the bath 22 It can be performed.

  Further, since the temperature of the hot water to be returned to the hot water storage tank 7 can be controlled to a lower temperature, the refrigerant enthalpy at the outlet of the hot water heat exchanger 2 does not rise and the convection of the hot water storage tank 7 hardly occurs. A highly efficient heat pump device can be obtained.

  FIG. 3 is a diagram showing the flow rate characteristics when the output of the bath water heating pump 16 is changed (output 0% to 100%) when the hot water pump 8 is driven in the configuration of FIG. . When the hot water heating operation and the hot water heating operation are simultaneously performed, the hot water heated by the hot water heat exchanger 12 is returned from the hot water lower circuit 11 to the hot water storage tank 7. Hot water supplied from the bathtub water heating circuit 23 joins the hot water flow of the circuit 11 and the pressure loss of the hot water lower circuit 11 increases.

  For this reason, when the output of the hot water supply pump 8 is made constant, the flow rate of the hot water conveyed by the hot water supply pump 8 varies according to the output of the bathtub water heating pump 16 (Abc). If the flow rate of hot water in the hot water pump 8 fluctuates, the temperature of the hot water heated by the hot water heat exchanger 2 and the heat pump cycle become unstable, and the durability of the heat pump device is reduced. Therefore, even when the output of the bathtub water heating pump 16 is changed (ABC), the output of the bathtub water heating pump 16 is supported so that the flow rate of the hot water conveyed by the hot water pump 8 is constant. Thus, the output of the hot water supply pump 8 is corrected as shown in ((A)-(B)-(C)).

  This is when the bath water heating operation and the hot water heating operation are performed simultaneously by causing the operation control means 28 to perform the output control correction of the hot water pump 8 together with the output control of the bath water heating pump 16. However, the temperature of the hot water heated by the hot water supply heat exchanger 2 and the heat pump cycle can be stabilized.

  When the output of the bathtub water heating pump 16 is only ON-OFF control, the operation control means 28 corrects the output of the hot water supply water pump 8 together with the ON output of the bathtub water heating pump 16. Therefore, even when the bath water heating operation and the hot water heating operation are performed simultaneously, the temperature of the hot water heated by the hot water heat exchanger 2 and the heat pump cycle can be stabilized.

In addition, when the heating operation of the bath water and the heating operation of the hot water are performed at the same time, the hot water heated by the hot water heat exchanger 12 is returned from the hot water upper circuit 10 to the hot water storage tank 7. Since the flow of hot water in the upper circuit 10 and the hot water heated from the bathtub water heating circuit 23 are irrelevant, the hot water conveyed by the hot water pump 8 according to the output of the bathtub water heating pump 16. The flow rate of fluctuates.

  In other words, the output control correction of the hot water supply water pump 8 which is performed together with the output control of the bathtub water heating pump 16 by the operation control means 28 becomes unnecessary, and it is necessary to cancel this correction. The temperature detection means 29 detects the hot water temperature and performs the circuit switching operation of the water channel switching means 12, and at the same time, the operation control means 28 performs the control to cancel this operation, so that the bath water heating operation and the hot water supply are performed. Even when the heating operation is simultaneously performed, the temperature of the hot water heated by the hot water supply heat exchanger 2 and the heat pump cycle can be stabilized.

  In FIG. 4, a check means 23 is provided in the bathtub water pouring circuit 24 and connected to the upstream side of the check means 23 of the bathtub water heating circuit 17. Also in the configuration of FIG. 4, it is possible to prevent heat loss due to natural convection of hot hot water in the hot water storage tank 7 and to stabilize the hot water temperature of the mixing valve 25. 4 is provided with check means 23 that are independent from each other as compared to FIG. 1, so that the bath water generated when the hot water of the hot water storage tank 7 is poured into the bathtub 22 via the mixing valve 25. Although the heat dissipation loss of the heating circuit 17 can be reduced, the configuration of FIG. 1 can reduce the cost by using one check means 23.

  In order to obtain hot hot water in the hot water supply circuit 9 of the hot water supply heat exchanger 2, the refrigeration cycle preferably uses carbon dioxide as a refrigerant and is operated at a pressure exceeding the critical pressure. Further, by using carbon dioxide as a refrigerant, the heat pump device can be used at a high temperature, and when hot water is stored as hot water using the hot water storage tank 7, the amount of heat that can be stored in the hot water storage tank Can be improved.

  In addition, the hot water heating operation and the hot water heating operation can be performed simultaneously by connecting the bathtub water heating circuit 17 directly to the hot water storage tank 7 without joining the hot water lower circuit 11. However, during simultaneous operation, hot water is returned to the hot water storage tank 7 from two directions, and the hot water storage tank 7 is agitated. Accordingly, the hot water at the lower temperature of the hot water storage tank 7 is mixed with the hot water at the upper temperature of the hot water storage tank 7, and the amount of stored hot water in the hot water storage tank 7 is reduced.

  In the configuration of FIG. 2, when the bath water heating operation is performed alone, part of the hot water flowing into the hot water lower circuit 11 flows back to the hot water circuit 9 of the heat pump cycle 6. When the temperature of the hot water flowing back is high, the hot water heat exchanger 2 is heated. Therefore, when the heat pump cycle is started, the rise in the temperature of the hot water discharged from the hot water heat exchanger 2 may be accelerated. It becomes possible.

  In addition, although the said embodiment demonstrated the case where water was distribute | circulated to the utilization side piping of the hot water supply heat exchanger 2, a hot water supply tank etc. may be provided and this water may be conveyed to a heat pump apparatus. In addition to water, a heat medium such as refrigerant or oil may be circulated in the hot water supply circuit.

  In the above-described embodiment, the hot water supply heat exchanger 2 has been described as hot water supply. However, for example, a hot water storage device such as a hot water pool, a heating hot water storage tank, or a floor heater is required for heat insulation. You may use for an apparatus or an installation, a heating apparatus or an installation, or a heating apparatus or an installation.

(Embodiment 2)
FIG. 5 shows a configuration diagram of a heat pump apparatus according to the second embodiment of the present invention.

  In FIG. 5, a heat pump cycle 6 is configured by connecting a compressor 1, a hot water supply heat exchanger 2, a decompression unit 3, and an evaporator 4 in an annular manner in order with a refrigerant circuit 5. On the other hand, the hot water storage tank 7 stores hot water, and the hot water circuit 9 connects the hot water storage tank 7, the hot water pump 8, the hot water heat exchanger 2, and the water channel switching means 12 in this order. When returning the hot water flowing out of the hot water heat exchanger 2 to the upper part of the hot water tank 7, the hot water is supplied via the hot water upper circuit 10 and the bathtub water heating circuit 17 connecting the water channel switching means 12 and the upper part of the hot water tank 7. Is returned to the lower part of the hot water storage tank 7 through the hot water supply lower circuit 11 connecting the water channel switching means 12 and the lower part of the hot water storage tank 7.

  Therefore, by controlling the operation of the water channel switching means 12, it is possible to selectively switch the position where the hot water flowing out from the heat pump cycle 6 is returned to either the upper part or the lower part of the hot water storage tank 7. Further, the hot water storage tank 7 is provided with a bathtub water heating circuit 17 in which a check means 23, a bath heat exchanger 15, and a bathtub water heating pump 16 are connected in order, and a hot water supply upper circuit 10 is connected. The downstream end of the heating means 17 is connected to the hot water supply lower circuit 11. The check means 23 is installed in such a direction as to prevent hot water returning from the hot water lower circuit 11 to the hot water storage tank 7 from flowing back through the bathtub water heating circuit 17.

  The check means 23 has a structure in which a valve body and a spring are incorporated and the valve body is held by spring pressure. In the forward flow of the check means 23, a water pressure exceeding the spring pressure holding the valve body is generated. Only when this occurs, a flow passing through the check means 23 is generated.

  Below, operation | movement and an effect | action of the heat pump apparatus by this Embodiment are demonstrated.

  The operation of heating the hot water stored in the hot water storage tank 7 in the heat pump cycle 6 is as follows. Hot water in the hot water storage tank 7 is conveyed to the hot water supply heat exchanger 12 by the hot water pump 8 and heated by the heat pump cycle operation of the heat pump cycle 6. In order to increase the temperature of the hot water stored in the hot water storage tank 7, the hot water is stored in the hot water lower circuit 11 until the temperature of the hot water heated by the hot water heat exchanger 12 exceeds a predetermined temperature. Returning to the tank 7, when the temperature reaches a predetermined temperature or higher, the water channel switching means 12 is operated to return the hot water to the hot water storage tank 7 from the hot water upper circuit 10 and the bath water heating circuit 17. The hot water supply pump 8 controls the flow rate of the hot water supply circuit 9 so that the temperature of the hot water heated by the hot water supply heat exchanger 12 becomes a predetermined temperature.

  The pouring (hot water filling) to the bathtub 22 and the heating of the bathtub water are as follows. The mixing valve 25 of the bathtub water pouring circuit 24 adjusts the mixing ratio of hot water and tap water so that the pouring temperature detected by the temperature detecting means 26 becomes a temperature preset by a remote controller or the like (not shown). To do. The bathtub water having a predetermined temperature flows out from the bathtub water circuit 19 to the bathtub 22.

  On the other hand, when the bathtub water in the bathtub 22 is heated, the hot water supply water stored in the hot water storage tank 7 is conveyed to the bath heat exchanger 15 by the bathtub water heating pump 16, and the bathtub conveyed from the bathtub water pump 18. Heat the water. The hot-water supply water whose temperature has been lowered by heating the bath water in the bath heat exchanger 15 flows into the interior from the lower part of the hot-water storage tank 7 to which the hot-water supply lower circuit 11 is connected.

  When the hot water heating operation is performed when the bath water heating operation is not performed, the temperature of the hot water heated by the hot water heat exchanger 12 becomes equal to or higher than a predetermined temperature, and the hot water is supplied to the hot water upper circuit 10. When returning to the hot water storage tank 7 more, the spring pressure of the non-return means 23 and the pressure loss through the bath heat exchanger 15 and the bath water heating pump 16 are changed to the hot water supply upper circuit 10 -the bath water heating circuit 17 -the hot water storage tank. It is possible to prevent hot water from flowing into the bathtub water heating circuit 17 and returning from the lower part of the hot water storage tank 7 by making it larger than the pressure loss leading to 7.

  Moreover, when performing the heating operation of bathtub water and the heating operation of hot water supply simultaneously, it becomes the following operations. The heated hot water having a high temperature returns from the upper part of the hot water storage tank 7 via the hot water upper circuit 10 and the bathtub water heating circuit 17. At the same time, when the bathtub water in the bathtub 22 is heated, the bathtub water pump 18 is operated, and the hot water supplied from the hot water upper circuit 10 is directly supplied to the bath heat exchanger 15 by the bathtub water heating pump 16. Convey and heat bath water. The hot-water supply water whose temperature has been lowered by heating the bath water in the bath heat exchanger 15 flows into the interior from the lower part of the hot-water storage tank 7 to which the hot-water supply lower circuit 11 is connected.

  At this time, the following effects can be acquired by conveying the hot hot water supplied from the hot water upper circuit 10 directly to the bath heat exchanger 15. Since the temperature of the hot water stored in the hot water storage tank 7 is lower than the temperature of the hot water supplied from the hot water upper circuit 10, the hot water stored at a low temperature is stored when the hot water is returned to the hot water tank 7. The temperature is lowered and mixing loss occurs. When the temperature of the hot water supplied to the bath heat exchanger 15 is lowered, the amount of heat heated by the bath heat exchanger 15 is lowered and the usability is deteriorated. Moreover, since there is no mixing loss, the amount of hot water in the hot water storage tank used for heating the bath water can be reduced. By directly transporting to the bath heat exchanger 15 as in the present invention, the temperature drop of the hot water supply can be minimized, the operating efficiency can be improved, and a heat pump device without fear of running out of hot water can be obtained.

  Further, in FIG. 6, the operation control means 28 is a control means for controlling the outputs of the hot water supply pump 8 and the bathtub water heating pump 16, and the hot water supply pump 8 is installed at the outlet of the hot water supply heat exchanger 2. The temperature of the hot water detected by the temperature detection means 29 is controlled to be a predetermined temperature. The bathtub water heating pump 16 is configured to vary the flow rate of hot water flowing into the bath heat exchanger 15 by controlling its output. The bath water heating operation according to the convenience of the user by varying the hot water flow rate based on the amount of heat for heating the bath water set by the user in the operation control means 28 and the temperature of the bath water returning to the bath 22 It can be performed. Further, since the temperature of the hot water returned to the hot water storage tank 7 can be controlled to a lower temperature, the refrigerant enthalpy at the outlet of the hot water heat exchanger 2 does not rise, and convection of the hot water storage tank 7 is unlikely to occur. A highly efficient heat pump device can be obtained.

  FIG. 7 is a diagram showing the flow rate characteristics when the output of the hot water supply water pump 8 is changed (output 20% to 80%) when the bathtub water heating pump 16 is driven in the configuration of FIG. 6. . When the hot water heating operation and the hot water heating operation are performed simultaneously, the hot water heated by the hot water heat exchanger 12 is returned from the hot water upper circuit 10 to the hot water storage tank 7. The flow of hot water in the circuit 10 merges into the bathtub water heating circuit 17, and the flow rate of hot water conveyed to the bath heat exchanger 15 increases.

  For this reason, when the output of the bathtub water heating pump 16 is constant, the flow rate of hot water conveyed to the bath heat exchanger 15 varies according to the output of the hot water pump 8 (A2-b2-c2). . When the flow rate of hot water of the bathtub water heating pump 8 varies, the temperature of the bathtub water heated by the bath heat exchanger 15 becomes unstable, and the temperature of the bathtub water returning to the bathtub varies. Therefore, even when the output of the hot water supply pump 8 is changed (A2-b2-c2), it corresponds to the output of the hot water supply pump 8 so that the flow rate of the hot water conveyed by the bathtub water heating pump 16 is constant. Thus, the output of the bath water heating pump 16 is corrected as shown in (A2-B2-C2).

When the operation control means 28 performs the output control correction of the bathtub water heating pump 16 together with the output control of the hot water supply water pump 8, the bath water heating operation and the hot water heating operation are simultaneously performed. However, the temperature of the bath water heated by the bath heat exchanger 15 and the temperature of the bath water returning to the bath can be stabilized. Moreover, when it becomes control which the output of the hot water supply water pump 8 increases, since the output of the bathtub water heating pump 16 can be lowered | hung, since the electric energy which an apparatus consumes can be reduced, operation efficiency is high. It can be set as a heat pump apparatus.

  Therefore, the bath water heating operation and the hot water heating operation can be performed at the same time. Even if the bath water heating operation is performed, there is no fear of running out of hot water, and a heat pump device with high operating efficiency can be obtained.

  In the present embodiment, the object to be heated with the hot water in the hot water storage tank 7 is the bath water, but it is also possible to use the circulating water for heating shown in the conventional example. The heat pump device can be used without worrying about running out of hot water.

  In order to obtain hot hot water in the hot water supply circuit 9 of the hot water supply heat exchanger 2, the refrigeration cycle preferably uses carbon dioxide as a refrigerant and is operated at a pressure exceeding the critical pressure. Further, by using carbon dioxide as a refrigerant, the heat pump device can be used at a high temperature, and when hot water is stored as hot water using the hot water storage tank 7, the amount of heat that can be stored in the hot water storage tank Can be improved.

  The heat pump device according to the present invention leads to improvement in operation efficiency and prevention of running out of hot water, and can also be used for applications such as heating or waste heat source utilization heat pump devices in addition to bath water heating operation.

Configuration diagram of heat pump device in Embodiment 1 of the present invention Configuration diagram of the heat pump device Diagram showing the flow characteristics of the hot water pump Configuration diagram of other heat pump devices The block diagram of the heat pump apparatus in Embodiment 2 of this invention Configuration diagram of the heat pump device Diagram showing the flow characteristics of the hot water pump Configuration diagram of a conventional heat pump device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Hot-water supply heat exchanger 3 Depressurization means 4 Evaporator 5 Blower means 6 Heat pump cycle 7 Hot water storage tank 8 Hot-water supply pump 9 Hot-water supply circuit 10 Hot-water supply upper circuit 11 Hot-water supply lower circuit 12 Water channel switching means 15 Bath heat exchanger DESCRIPTION OF SYMBOLS 16 Bath water heating pump 17 Bath water heating circuit 20 Hot water supply cycle 23 Check means 24 Bath water pouring circuit 25 Mixing valve 26 Temperature detection means 28 Operation control means 29 Temperature detection means

Claims (8)

A heat pump cycle in which a compressor, a hot water heat exchanger, a pressure reducing means, and an evaporator are connected in a ring shape with a refrigerant circuit, a hot water storage tank, and an upper portion of hot water that returns hot water heated by the hot water heat exchanger to the upper portion of the hot water storage tank A circuit, a hot water lower circuit for returning hot water heated by the hot water heat exchanger to a lower part of the hot water storage tank, water channel switching means for switching between the hot water upper circuit and the hot water lower circuit, and the hot water storage tank A bath heat exchanger for exchanging heat between hot water and bathtub water, a check means for preventing back flow of hot water, and a bath water heating circuit connected in order of the hot water storage tank, the check means, and the bath heat exchanger The heat pump device is characterized in that a downstream side of the non-return means of the bathtub water heating circuit is connected to the hot water supply lower circuit. A bathtub water pouring circuit for pouring hot water from the hot water storage tank into the bathtub, and a mixing valve disposed in the bathtub water pouring circuit for mixing the tap water and hot water from the hot water tank so as to reach a predetermined temperature. The heat pump device according to claim 1, wherein the upstream side of the bathtub water pouring circuit is connected to the downstream side of the check means of the bathtub water heating circuit. The heat pump apparatus according to claim 1, further comprising a bathtub water heating pump that conveys hot water in the hot water storage tank to a bath heat exchanger, and changes an output of the bathtub water heating pump. A bathtub water heating pump that conveys hot water in the hot water storage tank to the bath heat exchanger, and a hot water pump that conveys hot water in the hot water storage tank to the hot water heat exchanger, based on the output of the bathtub water heating pump, The heat pump device according to any one of claims 1 to 3, wherein an output of the hot water supply pump is changed. A temperature detecting means for detecting the temperature of the outlet of the hot water heat exchanger is provided, and the output of the hot water pump is changed based on the detected value of the temperature detecting means and the output of the bathtub water heating pump. The heat pump device according to claim 4. The heat pump device according to claim 1, wherein the hot water supply upper circuit is connected to the bathtub water heating circuit. A bathtub water heating pump that conveys hot water in the hot water storage tank to the bath heat exchanger, and a hot water pump that conveys hot water in the hot water storage tank to the hot water heat exchanger, based on the output of the bathtub water heating pump, The heat pump device according to claim 7, wherein the output of the hot water pump is changed. The heat pump apparatus according to any one of claims 1 to 7, wherein carbon dioxide is used as a refrigerant and the high pressure side is operated in a supercritical pressure state.

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