JP2008151418A - Heat pump type hot water supply apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reliable heat pump type hot water supply apparatus capable of eliminating concerns of a user with respect to leaking from a water piping by recovering and draining even water droplets formed on a drain pan even in humid conditions of the summer season. <P>SOLUTION: The heat pump type hot water supply apparatus is characterized by that it is provided with a hot water supply outdoor unit having refrigeration cycle circuit sequentially connecting a compressor, a hot water supply heat exchanger, a throttle valve, and an evaporator 21, a unit base 9 composing a bottom part of the hot water supply outdoor unit, the drain pan 30 provided between the evaporator 21 and the unit base 9, a drain port 8a of the drain pan 30 provided in the drain pan 30, and a drain port 8b of the unit base 9 provided in the unit base 9 and arranged in substantially the same position as the drain port 8a of the drain pan 30 in a vertical direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drain pan of a heat pump type hot water heater.

  In the conventional heat pump type hot water heater, the evaporator is installed on the unit base, and the unit base is a drain pan. The unit base was provided with a drain water discharge hole, and in the case of concentrated drainage, a drain hose was connected via a drain socket and drained from the drain hole.

  In addition, when a large amount of drain water that cannot be completely evaporated by the heat exchanger flows into the water storage part, in order to solve the problem of overflowing from parts other than the drain water drain hole, on the substrate forming the bottom part of the housing A refrigeration cycle including a compressor and a heat exchanger is provided, and a water storage unit for storing drain water discharged from the refrigeration cycle is formed on the substrate. Further, drain water accumulated in the water storage unit is disposed below the substrate at the bottom of the water storage unit. In the integrated air conditioner that is provided with a drain hole for discharging to a tray provided on the substrate, in the vicinity of the drain hole on the bottom surface of the substrate, the drain water flowing out from the drain hole is prevented from flowing out, and the drain water is discharged. There has been proposed a drain water drain hole structure of an integrated air conditioner in which a draining portion leading to a lower tray is formed (see, for example, Patent Document 1).

Further, a substrate on which the indoor heat exchanger and the outdoor heat exchanger are placed is disposed in the exterior case, and the coil body made of a shape memory alloy set so as to expand in the high temperature phase and contract in the low temperature phase An open / close mechanism with a stop cock attached to one end of the air conditioner is provided close to or in contact with the outdoor heat exchanger, and the dew condensation of the air conditioner has a drain outlet that is opened and closed by the stop cock of the open / close mechanism on the substrate A water treatment apparatus has been proposed (see, for example, Patent Document 2).
JP 2005-188882 A JP-A-60-133238

  However, according to the configuration of the conventional heat pump type hot water heater, ambient air condenses on the back surface of the unit base due to the low-temperature drain water under the humid conditions in summer. This condensed water drops on the surface of the water heater and wets the surface. Since the water pipe is arranged inside the water heater, there is a problem that the user sees a wet installation surface and is mistaken for a problem because of fear of leakage from the water pipe.

  The present invention has been made to solve the above-mentioned problems, and by collecting and draining water droplets condensed on the drain pan even under high humidity conditions in summer, the concern about leakage from the user's water piping is eliminated. An object of the present invention is to provide a heat pump type hot water heater that is highly reliable.

  A heat pump type hot water heater according to the present invention comprises a hot water supply outdoor unit having a refrigeration cycle circuit in which a compressor, a hot water supply heat exchanger, a throttle valve, and an evaporator are sequentially connected, and the bottom of the hot water supply outdoor unit. The drain base provided between the unit base, the evaporator, and the unit base, the drain outlet of the drain pan provided in the drain pan, and substantially the same in the vertical direction as the drain outlet of the drain pan provided in the unit base. And a unit-based drain outlet disposed at a position.

  Since the heat pump water heater according to the present invention can prevent water leakage from places other than the central drainage under the humid conditions in summer, the reliability is improved without fear of leakage from the user's water piping. Also, the drain pan and unit base are provided with drain drain ports at the same position in the vertical direction, so that drain water generated during defrosting operation under the freezing point condition in winter is directly outside the unit without touching the unit base. Since drainage is performed, freezing in the drainage path in the unit can be prevented, the drainage path can be secured, and the reliability is improved.

Embodiment 1 FIG.
1 to 3 are diagrams showing Embodiment 1, FIG. 1 is an exploded perspective view of a hot water supply outdoor unit 100, FIG. 2 is a piping system diagram showing a refrigeration cycle circuit and a hot water supply circuit of the hot water outdoor unit 100, and FIG. These are the block diagrams which show arrangement | positioning of the evaporator 21, the drain pan 30, and the unit base 9 of the hot water supply outdoor unit 100. FIG.

  In FIG. 1, a hot water supply heat exchanger unit 11 is arranged at the lowest stage of the hot water supply outdoor unit 100, an evaporator 21 at the upper part thereof, and a blower 22 for sending wind for the evaporator 21 to exchange heat with outside air, A compressor 23 is arranged. A pump 24 for circulating water in the hot water supply circuit is arranged in front of the right side surface, and water from a hot water supply tank (not shown) is taken into the hot water supply outdoor unit 100 from the water inlet valve 25. It returns to the hot water supply tank from the hot water supply outlet valve 29 through the water pipe 2 of the hot water supply heat exchanger 1 (see FIG. 2).

  Further, the outer shell of the hot water supply outdoor unit 100 includes a front panel 18 having a grille 19 disposed on the front surface and a suction port on the left side surface, a back panel 20 covering the right side surface to the end of the evaporator 21 on the rear surface, The service panel 26 that covers the valves and the top panel 17 at the top are configured.

  In FIG. 2, the high-temperature and high-pressure gas refrigerant compressed by the compressor 23 flows into the refrigerant pipe 3 of the hot water supply heat exchanger 1. When water taken into the hot water supply outdoor unit 100 from the water inlet valve 25 by the pump 24 passes through the hot water supply water pipe 2 of the hot water supply heat exchanger 1, the water is exchanged with the gas refrigerant in a high temperature and high pressure state to form water. Is heated. The refrigerant that has transferred heat to the water passes through the internal heat exchanger 15, and then is decompressed by the throttle valve 28 and flows into the evaporator 21. In the evaporator 21, the refrigerant absorbs heat from the air blown by the blower 22, is evaporated and gasified, is reheated by the internal heat exchanger 15, and returns to the compressor 23. The flow rate of the high-pressure refrigerant flowing into the internal heat exchanger 15 is adjusted by the flow rate adjustment valve 27. For example, carbon dioxide refrigerant is used as the refrigerant in the refrigeration cycle circuit of FIG.

  In FIG. 3, the drain pan 30 is provided between the evaporator 21 and the unit base 9. The drain outlet 8a of the drain pan 30 and the drain outlet 8b of the unit base 9 are provided at the same position in the vertical direction. The drain water 41 generated in the evaporator 21 flows out from the drain drain port 8a of the drain pan 30 and the drain drain port 8b of the unit base 9 to the drain hose 31 outside the unit through the drain socket 35 attached to the unit base 9. . The material of the drain pan 30 is a resin. A unit base leg 10 is attached to the bottom of the unit base 9, and the unit base leg 10 is placed on the installation surface.

  Under the hot and humid conditions in summer, the drain water 41 generated from the evaporator 21 causes the bottom surface of the drain pan 30 to be below the dew point of the surrounding air, and the condensed water 42 is condensed on the bottom surface of the drain pan 30. The condensed water 42 drops from the bottom surface of the drain pan 30 to the unit base 9 and flows out to the drain hose 31 outside the unit through the drain socket 35.

  In this way, the condensed water 42 other than the drain water 41 is not dripped outside the unit, so that the reliability is improved without being mistaken for a leak from the water pipe 2 from the user. Moreover, since the drain pan 30 is made of resin, the hot water supply outdoor unit 100 can be reduced in weight.

Embodiment 2. FIG.
FIG. 4 is a diagram showing the second embodiment, and is a configuration diagram showing the arrangement of the evaporator 21, the drain pan 30, and the unit base 9 of the hot water supply outdoor unit 100 of the heat pump type hot water heater installed in a cold region. In FIG. 4, the drain pan 30 is provided between the evaporator 21 and the unit base 9. The drain outlet 8a of the drain pan 30 and the drain outlet 8b of the unit base 9 are provided at the same position in the vertical direction. The drain outlet 8b of the unit base 9 is made larger than the drain outlet 8a of the drain pan 30. In a cold region, the unit is placed on the installation base 33 and the drain socket 35 is removed. Further, the drain pan 30 is made of metal, and an antifreezing heater 32 is disposed on the drain pan 30.

  The action under hot and humid conditions in summer is the same as that of the first embodiment. That is, the drain water 41 generated from the evaporator 21 causes the bottom surface of the drain pan 30 to be below the dew point of the ambient air, and the dew condensation water 42 is condensed on the bottom surface of the drain pan 30. The condensed water 42 drops from the bottom surface of the drain pan 30 onto the unit base 9 and flows out from the drain outlet 8b of the unit base 9 to the outside of the unit.

  In an environment below freezing point in winter, drain water 41 generated from the evaporator 21 by defrosting is discharged from the drain outlet 8 a of the drain pan 30. Since the drain outlet 8b of the unit base 9 is larger than the drain outlet 8a of the drain pan 30, the drain water 41 discharged from the drain outlet 8a of the drain pan 30 is drained directly outside the unit without touching the unit base 9. The

  The drain water 41 is heated by the anti-freezing heater 32 and the drain water 41 does not flow through the unit base 9 cooled by the outside air below freezing point.

  By adopting such a configuration, the dew condensation water 42 other than the drain water 41 does not drip outside the unit under hot and humid conditions in the summer, and it is possible to prevent the drainage path from being blocked by freezing even in an environment below the freezing point in the winter. Reliability is improved.

Embodiment 3 FIG.
FIG. 5 is a diagram showing the third embodiment, and is a configuration diagram showing the arrangement of the evaporator 21, the drain pan 30, and the unit base 9 of the hot water supply outdoor unit 100 of the heat pump type hot water heater installed in a cold region. In FIG. 5, the drain pan 30 is provided between the evaporator 21 and the unit base 9. The drain outlet 8a of the drain pan 30 and the drain outlet 8b of the unit base 9 are provided at the same position in the vertical direction. The drain outlet 8b of the unit base 9 is made larger than the drain outlet 8a of the drain pan 30. A drain socket 35 is attached to the unit base 9. A drain hose 31 to which a winding heater 34 is attached is connected to the drain socket 35. Further, the drain pan 30 is made of metal, and a freeze prevention heater 32 is disposed on the drain pan 30.

  The action under hot and humid conditions in summer is the same as that of the first embodiment. That is, under the hot and humid conditions in summer, the drain water 41 generated from the evaporator 21 causes the bottom surface of the drain pan 30 to be below the dew point of the ambient air, and the dew condensation water 42 is condensed on the bottom surface of the drain pan 30. The condensed water 42 drops from the bottom surface of the drain pan 30 to the unit base 9 and flows out to the drain hose 31 outside the unit through the drain socket 35.

  In an environment below freezing point in winter, drain water 41 generated from the evaporator 21 by defrosting is drained from the drain outlet 8 a of the drain pan 30. Since the drain outlet 8b of the unit base 9 is larger than the drain outlet 8a of the drain pan 30, the drain water 41 drained from the drain outlet 8a of the drain pan 30 does not touch the unit base 9 and drains directly to the outside of the unit. Is done.

  The drain water 41 is heated by the antifreeze heater 32, and the drain water 41 does not flow through the unit base 9 cooled by outside air below the freezing point, and the drain hose 31 is also heated by the wrapping heater 34 so that it is frozen. It can be drained to a hopper (not shown) or the like.

  By adopting such a configuration, the dew condensation water 42 other than the drain water 41 does not drip outside the unit under hot and humid conditions in the summer, and it is possible to prevent the drainage path from being blocked by freezing even in an environment below the freezing point in the winter. Reliability is improved. Further, concentrated drainage is possible even in cold regions, freezing due to the drain water 41 at the bottom of the unit can be prevented, a fall accident can be prevented, and safety is improved.

  Next, a comparison between the present invention and patent documents will be described. In Patent Document 1, a drain hole for draining drain water accumulated in the water storage portion to a tray provided below the substrate is provided at the bottom of the water storage portion that stores drain water formed on the substrate of the integrated air conditioner. Yes. This patent document 1 changes the draining part shape of a drain hole, in order to prevent the water which flowed out from the drain pan drain hole going along the drain pan bottom face and falling outside a unit. On the other hand, the present invention is a structure that can collect water droplets (condensation water 42) condensed on the bottom surface of the drain pan 30 that is generated because the heat pump type hot water heater is operated as an evaporator under high-temperature and high-humidity environmental conditions in summer. It differs from Patent Document 1 in that water leakage from the drain pan 30 other than the drain outlet 8a to the outside of the unit can be prevented.

  Japanese Patent Laid-Open No. 2004-228688 is directed to the dewed water led to a substrate below the outdoor heat exchanger of the integrated air conditioner, and a drain port provided at a position directly below the drain port of the substrate is provided in the exterior case. In this patent document 2, the drainage joint of the board and the drainage joint attached to the exterior case are in the same position, but the drainage joint does not have the function of draining the water accumulated inside the exterior case, so condensation has formed on the backside of the board. The water cannot be recovered and drained. On the other hand, the present invention is different from Patent Document 2 in that water droplets (condensation water 42) condensed on the back surface of the drain pan 30 can be collected and drained by the unit base 9.

FIG. 5 shows the first embodiment, and is an exploded perspective view of a hot water supply outdoor unit 100. FIG. FIG. 2 is a diagram showing the first embodiment, and is a piping system diagram showing a refrigeration cycle circuit and a hot water supply circuit of the hot water supply outdoor unit 100. FIG. 3 is a diagram illustrating the first embodiment and is a configuration diagram illustrating an arrangement of an evaporator 21, a drain pan 30, and a unit base 9 of the hot water supply outdoor unit 100. FIG. FIG. 6 is a diagram showing the second embodiment, and is a configuration diagram showing an arrangement of an evaporator 21, a drain pan 30, and a unit base 9 of a hot water supply outdoor unit 100 of a heat pump type hot water heater installed in a cold district. FIG. 6 is a diagram showing the third embodiment, and is a configuration diagram showing an arrangement of an evaporator 21, a drain pan 30, and a unit base 9 of a hot water supply outdoor unit 100 of a heat pump type hot water heater installed in a cold district.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Heat exchanger for hot water supply, 2 Water piping, 3 Refrigerant piping, 8a Drain drain port of the drain pan 30, 8b Drain drain port of the unit base 9, 9 Unit base, 10 Unit base leg part, 11 Heat exchanger unit for hot water supply, 15 Internal heat exchanger, 17 Top panel, 18 Front panel, 19 Grill, 20 Back panel, 21 Evaporator, 22 Blower, 23 Compressor, 24 Pump, 25 Water inlet valve, 26 Service panel, 27 Flow control valve, 28 Throttle valve, 29 Hot water outlet valve, 30 Drain pan, 31 Drain hose, 32 Antifreeze heater, 33 Installation stand, 34 Winding heater, 35 Drain socket, 41 Drain water, 42 Condensed water, 100 Hot water outdoor unit.

Claims (6)

A hot water supply outdoor unit having a refrigeration cycle circuit in which a compressor, a hot water supply heat exchanger, a throttle valve, and an evaporator are sequentially connected;
A unit base constituting the bottom of the hot water outdoor unit;
A drain pan provided between the evaporator and the unit base;
A drain outlet of the drain pan provided in the drain pan;
A heat pump type hot water heater comprising a unit base drain outlet provided in the unit base and disposed at substantially the same position in a vertical direction as the drain outlet of the drain pan.   An internal heat exchanger that exchanges heat between the refrigerant from the refrigerant outlet side of the hot water supply heat exchanger to the inlet side of the throttle valve and the refrigerant from the refrigerant outlet side of the evaporator to the suction side of the compressor. The heat pump type hot water heater according to claim 1, wherein a flow rate adjusting valve is provided between a refrigerant outlet side of the hot water supply heat exchanger and the throttle valve.   The heat pump type hot water heater according to claim 1, wherein the drain outlet of the unit base is larger than the drain outlet of the drain pan.   The heat pump water heater according to claim 1, wherein the drain pan is made of resin.   2. The heat pump type hot water heater according to claim 1, wherein the drain pan is made of metal and an anti-freezing heater is installed on the drain pan.   The heat pump type hot water heater according to any one of claims 1 to 5, wherein the refrigerant flowing through the refrigeration cycle circuit is a carbon dioxide refrigerant.

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