JP5166709B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus that enables reheating of bathtub water.

  Conventionally, in a hot water supply device, water is taken out from the lower part of the hot water storage tank, heated by the heat pump unit, and the heated hot water is taken into the upper part of the hot water storage tank to store the hot water. Used for bathing water in the bathtub.

When using the hot water in the hot water storage tank to refill the bath water, place a heat exchanger for hot water outside the hot water storage tank and operate the hot water circulation pump to take out hot water from the top of the hot water storage tank. There is a method of circulating the bathtub water through the heat exchanger for remedy and returning it to the lower part of the hot water storage tank, and circulating the bathtub water to the heat exchanger for remedy by operating the circulation pump for the bathtub. (For example, refer to Patent Document 1).
Japanese Patent No. 3632651 (6th page, FIG. 2)

  However, when bath water is replenished, a large amount of hot water stored in the upper part of the hot water tank is used, so that hot water used for, for example, a dishwasher cannot be supplied or can be used for hot water supply. There is a risk that the amount of hot water decreases and hot water runs out.

  This invention is made in view of such a point, and provides the hot water supply apparatus which can secure the amount of hot water which can be used for hot water supply, reducing the usage-amount of the hot water of the upper part of a hot water storage tank at the time of reheating of bath water With the goal.

The hot water supply device according to claim 1 is a hot water storage tank, an upper connection path connected to an upper part of the hot water storage tank, an intermediate part connection path connected to an intermediate part in the vertical direction of the hot water storage tank, and the upper connection path. An adjustment valve for adjusting the mixing ratio of the hot water in the upper part of the hot water storage tank to be taken out from the hot water in the intermediate part of the hot water storage tank to be taken out from the intermediate portion connection path, and A heat pump unit for boiling water, a heat pump forward path for connecting the inlet side of the heat pump unit and the lower part of the hot water storage tank, and an outlet side of the heat pump unit, the upper part of the hot water tank, and the intermediate part connecting path A boiling circulation path having a heat pump return path which is switched to and connected to any one of A switching valve for switching the connection between an outdoor unit provided with a circulating pump for boiling provided in a ring path and a heat pump return path of the circulating path for boiling to either the upper part of the hot water storage tank or the intermediate part connecting path And a heat exchanger for remedy through which bath water is circulated, and a circulation path for remedy connected from the hot water supply path through the heat exchanger for remedy to the heat pump forward path of the boiling circulation path, When the bath water is replenished, the switching valve is switched to the connection between the outlet side of the heat pump unit and the intermediate part connection path, and the adjustment valve is adjusted so that hot water is taken out only from the intermediate part connection path, and the heat pump unit actuates the boiling upper circulation pump actuates the, add焚用of閉水path between the heat pump unit and the add焚用heat exchanger without passing through the hot water storage tank In which and a control unit that make up the ring path.

According to the water heater 請 Motomeko 1 wherein, when the reheating of bathtub water, switches the switching valve to connect the outlet side and an intermediate portion connecting path of the heat pump unit, so as to take out the hot water adjustment valve from the intermediate portion connection path By adjusting the flow rate and operating the boiling circulation pump, it is possible to construct a closed circulation circulation path between the heat pump unit and the additional heat exchanger without passing through the hot water storage tank. By operating it, the hot water boiled by the heat pump unit can be used to recharge the bath water, the amount of hot water used in the upper part of the hot water storage tank can be reduced, and the amount of hot water available for hot water supply can be secured. In addition, even when the hot water storage tank has run out, the bath water can be replenished .

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the hot water supply device 11 includes a main body unit 12 and an outdoor unit 13 for boiling hot water, and has a function of adding bath water stretched on the bathtub 14.

  The main body unit 12 has a hot water storage tank 17 for storing hot water, and on the side surface of the hot water storage tank 17, together with the upper and lower portions of the hot water storage tank 17, each height in the vertical direction corresponding to a plurality of remaining hot water amounts in the hot water storage tank 17 is provided. A plurality of thermistors 18a to 18f as temperature detecting means for detecting the temperature of hot water in the hot water storage tank 17 are disposed at the position.

  A water supply path 20 connected to a water supply source such as a water pipe is connected to the lower part of the hot water storage tank 17. The water supply path 20 is provided with a pressure reducing valve 21 for reducing the water supply pressure, a check valve 22 that allows only the flow of water supplied to the hot water storage tank 17, and an opening / closing valve 23 for opening and closing the water supply path 20. The water supply path 20 has a water supply pipe 20a through which water flows to the lower part of the hot water storage tank 17 through the on-off valve 23, and a water supply pipe 20b through which water flows to the outdoor unit 13 when the on-off valve 23 is closed. The water supply pipe 20a and the water supply pipe 20b are connected via a check valve 24 that allows water to flow only in the direction from the lower part of the hot water storage tank 17 toward the outdoor unit 13.

  An upper connection path 26 is connected to the upper part of the hot water tank 17, and an intermediate part connection path 27 is connected to an intermediate part in the vertical direction of the hot water tank 17. The upper connection path 26 and the intermediate connection path 27 are connected to a regulating valve 28 that is an electric valve. By this regulating valve 28, the hot water in the upper part of the hot water storage tank 17 taken out from the upper connection path 26 and the intermediate connection path 27 are connected. The hot water storage tank 17 is taken out by adjusting the mixing ratio with the hot water in the intermediate part. The mixing ratio that can be adjusted by the adjusting valve 28 includes the case where either one is 100% and the other is 0%. The adjustment valve 28 is connected to a hot water supply path 29 for supplying the hot water taken out. The hot water supply path 29 is provided with temperature detecting means 30 for detecting the temperature of the hot water. The upper connection path 26, the intermediate connection path 27, the regulating valve 28, and the hot water supply path 29 form an extraction path 31 for extracting hot water from the hot water storage tank 17.

  A recirculation circulation path 34 connected to the water supply path 20 from the hot water supply path 29 is formed, and this recirculation circulation path 34 is reverse to allow only the flow of hot water from the hot water supply path 29 to the water supply path 20. A stop valve 35, a heat exchanger 36 for heat exchange with bath water, an outlet temperature detection means 37 for detecting the temperature of hot water on the outlet side of the heat exchanger 36, and from the hot water supply path 29 to the water supply path 20 A recirculation circulation pump 38 for circulating hot water is provided.

  The memorial heat exchanger 36 and the bathtub 14 are connected by a bathtub circulation path 41. The circulation path 41 for the bathtub includes a return pipe 42 that takes in the bathtub water from the bathtub 14 and leads it to the heat exchanger 36 for reheating, and a forward pipe 43 that guides the bathtub water that has passed through the heat exchanger 36 for reheating to the bathtub 14. Have. The return pipe 42 includes a thermistor 44 that detects the temperature of the bathtub water taken from the bathtub 14, a pressure sensor 45 that detects the water level of the bathtub 14, a switching valve 46 for switching the flow path when automatically filling the bathtub 14, A bath circulation pump 47 for circulating the bath water and a flow switch 48 for detecting the bath water circulation are provided. The forward piping 43 is provided with a thermistor 49 that detects the temperature of bathtub water introduced into the bathtub 14.

  The hot water supply path 29 and the water supply path 20 are connected to a hot water mixing valve 52 and a bath mixing valve 53, respectively. These mixing valves 52 and 53 mix hot water from the hot water supply path 29 and water from the water supply path 20, and are set by, for example, a main remote controller installed in a kitchen, a bathroom remote controller installed in a bathroom, or the like. Supply hot water at the set temperature. The connection pipe 20c of the water supply path 20 connected to the mixing valves 52 and 53 is provided with check valves 54 and 55 that allow only the flow of water in the direction toward the mixing valves 52 and 53.

  A hot water supply passage 56 for supplying hot water to a predetermined hot water supply location is connected to the mixing valve 52 for hot water supply. A flow meter 57 for detecting the flow rate of hot water and a temperature detection sensor 58 for detecting the temperature of the hot water are connected to the hot water supply passage 56. It is arranged.

  The bathtub mixing valve 53 is connected to a bathtub hot water supply pipe 59 for supplying hot water to the bathtub 14, and the hot water supply pipe 59 for bathtub has a check valve or a flow path that allows the flow of hot water supply only in the direction toward the bathtub 14. A hopper 60 having a water supply electromagnetic valve that opens and closes is disposed. The bathtub hot water supply pipe 59 is connected to the switching valve 46 of the bathtub circulation path 41 so that hot water can be supplied to the bathtub 14 through the bathtub circulation path 41.

  In addition, a relief valve 63 that releases excess pressure during boiling is connected to the upper connection path 26 of the hot water storage tank 17, and the relief valve 63 is connected to a drainage path 64. The lower part of the hot water storage tank 17 and the drainage path 64 are connected via a drainage valve 65 that drains the water in the hot water storage tank 17.

  Further, the hot water storage tank 17 side and the outdoor unit 13 are connected by a boiling circulation path 68. This boiling circulation path 68 has a heat pump return path 69 connecting the lower part of the hot water storage tank 17 and the inlet side of the outdoor unit 13 through the water supply path 20, and a heat pump return path 70 connected to the outlet side of the outdoor unit 13. doing. A switching valve 71 is disposed in the heat pump return path 70, and a heat pump return path 70a connected to the upper part of the hot water storage tank 17, a heat pump return path 70b connected to the intermediate connection path 27, and an additional path are connected to the switching valve 71. A heat pump return path 70c connected to the paddle circulation path 34 is connected. The switching valve 71 switches the connection to the outlet side of the outdoor unit 13 to any one of the heat pump return paths 70a, 70b, 70c.

  Further, the outdoor unit 13 is provided with a heat pump unit 74 for boiling hot water. The heat pump unit 74 has a refrigerant water channel including a compressor, a boiling heat exchanger functioning as a condenser, an expansion valve, an evaporator, and the like. A boiling circulation path 68 is connected to the boiling heat exchanger of the heat pump unit 74.

  The outdoor unit 13 includes a boiling circulation pump 75 that circulates from the heat pump going path 69 to the heat pump returning path 69 through the heat pump returning path 69 to the heat pump going path 69 upstream of the heating heat exchanger for the heat pump unit 74. It is arranged.

  The outdoor unit 13 is provided with a hot water temperature detecting means 76 for detecting the temperature of hot water discharged from the heating heat exchanger of the heat pump unit 74 to the heat pump return path 70.

  The main unit 12 includes a controller 81 that controls the hot water supply device 11. This control unit 81 has at least one of the following two as a reheating function for retreating bathtub water.

  In the first reheating function, when the bath water is reheated, the regenerative heat exchange is performed by the regulating valve 28 according to the temperature of the hot water on the outlet side of the reheating heat exchanger 36 detected by the outlet temperature detecting means 37. By controlling the temperature of the hot water flowing in the vessel 36, the memorial capacity is varied.

  In the second reheating function, the switching valve 71 is switched to the connection between the outlet side of the heat pump unit 74 and the intermediate portion connection path 27 and the adjustment valve 28 is taken out of the intermediate portion connection path 27 when reheating the bath water. Thus, the heat pump unit 74 is operated and the boiling circulation pump 75 is operated.

  Next, the operation of the present embodiment will be described.

  First, the hot water storage operation of the hot water storage tank 17 will be described.

  The heat pump unit 74 and the boiling circulation pump 75 of the outdoor unit 13 are operated as a specific boiling time zone, for example, in the nighttime zone of the hourly lighting system. By the operation of the circulating pump 75 for boiling, the water in the lower part of the hot water storage tank 17 is taken out from the heat pump going path 69 and sent to the heat pump unit 74, and the hot water boiled by the heat pump unit 74 is transferred by the switching valve 71 of the heat pump return path 70. It returns to the hot water storage tank 17 through one of the heat pump return paths 70a and 70b to be switched.

  When the temperature of the hot water boiled up by the heat pump unit 74 of the outdoor unit 13 is equal to or higher than the target boiling temperature, the switching valve 71 switches to the heat pump return path 70a, and hot water above the target boiling temperature is stored in the upper part of the hot water storage tank 17. To do.

  For example, when the total amount is near the boiling point when the total amount is boiling, the temperature of the water in the lower part of the hot water storage tank 17 becomes high, so the boiling capacity of the heat pump unit 74 decreases, and the hot water boiled by the heat pump unit 74 of the outdoor unit 13 is discharged. The hot water temperature becomes lower than the boiling target temperature. At this time, the switching valve 71 switches to the heat pump return path 70b to store hot water in the intermediate part of the hot water storage tank 17 through the intermediate part connection path 27, thereby preventing the temperature of the hot water in the upper part of the hot water storage tank 17 from decreasing.

  Next, the hot water supply operation will be described.

  By opening a hot water tap or the like disposed on the downstream side of the hot water supply path 56, the hot water in the upper part of the hot water storage tank 17 is pushed out by the supply water pressure, and hot water taken out from the hot water storage tank 17 through the hot water supply path 29 and water supply from the water supply path 20 The mixed water is mixed by the mixing valve 52 to supply hot water at a hot water supply set temperature. For the hot water taken out to the hot water supply passage 29, the mixing valve 28 adjusts the mixing ratio between the hot water in the upper portion of the hot water storage tank 17 taken out from the upper connection passage 26 and the hot water in the intermediate portion of the hot water storage tank 17 taken out from the intermediate connection passage 27. And take it out.

  Next, use of the bathtub 14 will be described.

  When the bathtub 14 is filled with hot water, the hot water in the hot water storage tank 17 is pushed out by the water supply pressure by opening the water supply electromagnetic valve of the hopper 60, and the hot water and the water supply path 20 taken out from the hot water storage tank 17 through the hot water supply path 29. The hot water at the set temperature of the bathtub is supplied to the bathtub 14 by mixing with the water supplied from the mixing valve 53. Hot water is supplied to the bathtub 14 through the hot water supply pipe 59 for the bathtub, the switching valve 46, and the return piping 43 to supply hot water while monitoring the water level with the pressure sensor 45 of the return piping 42, or to the return piping with the switching valve 46. A predetermined amount of hot water is quickly supplied through the two pipes 42 and 43.

  After filling the bathtub 14, the bathtub circulation pump 47 is activated to circulate the bathtub water in the bathtub 14 in the bathtub circulation path 41 at predetermined intervals, and the temperature of the bathtub water is detected by the thermistor 44 or the like. Monitor whether there is a need for heat insulation, that is, a memorial operation.

  And the case where the bathtub water hot-watered in the bathtub 14 is repelled by the 1st repelling function which the control part 81 has is demonstrated with reference to FIG.

  As indicated by the black display of the piping path in FIG. 1 and the arrow, the hot water and the middle part of the hot water storage tank 17 taken out from the upper connection path 26 by the regulating valve 28 are operated by operating the circulation pump 38 for remedy. It is taken out by adjusting the mixing ratio with the hot water in the intermediate part of the hot water storage tank 17 taken out from the connection path 27. The hot water taken out by the regulating valve 28 flows to the heat exchanger 36 for reheating through the recirculation circulation path 34, and heat is exchanged with the bath water in this heat exchanger 36 for reheating. The medium temperature water whose temperature has decreased due to the heat exchange in the recuperation heat exchanger 36 returns to the lower part of the hot water storage tank 17 from the recirculation circulation path 34 through the water supply path 20.

  The bathtub water taken into the bathtub circulation path 41 from the bathtub 14 rises in temperature while passing through the memory heat exchanger 36, returns to the bathtub 14, and raises the hot water temperature in the bathtub 14.

  The regulating valve 28 controls the temperature of the hot water flowing through the heat exchanger 36 for remedying according to the temperature of the medium temperature water coming out of the heat exchanger 36 for remedy detected by the outlet temperature detecting means 37, thereby improving the remedy capacity. Variable. Therefore, for example, the adjustment valve 28 should be adjusted so that the temperature of the medium-temperature water coming out of the reheating heat exchanger 36 is close to the temperature after reheating the bath water detected by the thermistor 49 of the outgoing pipe 43. In this case, the temperature of the intermediate water that leaves the memory heat exchanger 36 and enters the lower part of the hot water storage tank 17 can be made as low as possible. As a result, the temperature of the medium-temperature water in the hot water storage tank 17 heated by the heat pump unit 74 can be lowered as much as possible during boiling in the subsequent boiling time period, and the boiling efficiency by the heat pump unit 74 can be improved.

  As described above, when the bath water is replenished, the adjusting valve 28 adjusts the mixing ratio of the hot water in the upper part of the hot water storage tank 17 and the hot water in the intermediate part of the hot water storage tank 17 to thereby change the heat exchanger 36 for reheating. Since the temperature of the flowing hot water is controlled to vary the memorial capacity, the amount of hot water used in the upper part of the hot water storage tank 17 can be reduced, and the amount of hot water available for hot water supply can be secured. Moreover, since the chasing ability can be varied, chasing efficiency can be improved.

  Further, the extraction path 31 such as the upper connection path 26, the intermediate connection path 27, the regulating valve 28, and the hot water supply path 29 can be shared by the hot water supply system and the tracking system, and the configuration can be simplified and inexpensive.

  Next, a case where the bath water filled in the bathtub 14 is repelled by the second repelling function of the control unit 81 will be described with reference to FIG.

  As shown by the black display (including the broken line) and the arrow (including the broken line) of the piping path in FIG. 2, the switching valve 71 is switched to the connection between the outlet side of the heat pump unit 74 and the intermediate connection path 27 and adjusted. The valve 28 is adjusted so that hot water mixed from the upper connection path 26 and the intermediate connection path 27 is taken out, and the boiling circulation pump 75 is operated. Here, it is assumed that the heat pump unit 74 is not operated.

  By the operation of the boiling circulation pump 75, the hot water taken out by the regulating valve 28 flows to the heat exchanger 36 for reheating through the recirculation circulation path 34, and heat is exchanged with the bath water in this heat exchanger 36 for reheating. To do. For example, medium temperature water whose temperature is lowered by 40 to 50 ° C. due to heat exchange in the heat exchanger 36 for remedy is supplied from the circulatory circulation path 34 to the water supply path 20, the boiling circulation path 68, the heat pump unit 74, and the switching valve 71. Then, it flows to the intermediate part connection path 27 through the heat pump return path 70b.

  Part of the warm water that has flowed through the intermediate connection path 27 is taken out from the regulating valve 28, and the remaining part returns to the intermediate part of the hot water storage tank 17.

  In the regulating valve 28, the mixing ratio between the hot water in the upper part of the hot water storage tank 17 taken out from the upper connection path 26 and the medium temperature water after passing through the heat exchanger 36 for taking out from the intermediate connection path 27 is taken out.

  The bathtub water taken into the bathtub circulation path 41 from the bathtub 14 rises in temperature while passing through the memory heat exchanger 36, returns to the bathtub 14, and raises the hot water temperature in the bathtub 14.

  In this way, when the bath water is reclaimed, the hot water extracted from the upper part of the hot water storage tank 17 can be replenished without waste by reusing the medium-temperature water after passing through the heat exchanger 36 for reheating. The amount of hot water used in the upper part of the hot water storage tank 17 can be reduced, and the amount of hot water available for hot water supply can be secured. Moreover, since the intermediate temperature water can be returned to the intermediate part of the hot water storage tank 17 and the amount of the intermediate temperature water returned can be reduced, the boiling of the intermediate temperature water in the heat pump unit 74 is reduced during the subsequent boiling time. The boiling efficiency by the heat pump unit 74 can be improved.

  Alternatively, the heat pump unit 74 may be operated to boil up the medium-temperature water that has passed through the heat exchanger 36 for tracking.

  In this case, the switching valve 71 is switched to the connection between the outlet side of the heat pump unit 74 and the intermediate connection path 27 as shown by the black display of the piping path in FIG. Adjustment is made so that hot water is taken out only from the connection path 27, and the heat pump unit 74 is operated and the boiling circulation pump 75 is operated.

  By the operation of the boiling circulation pump 75, the hot water taken out by the regulating valve 28 flows to the heat exchanger 36 for reheating through the recirculation circulation path 34, and heat is exchanged with the bath water in this heat exchanger 36 for reheating. To do. For example, medium-temperature water having a temperature of 40 to 50 ° C., which has been reduced in temperature by heat exchange in the heat exchanger 36 for reheating, flows from the recirculation circulation path 34 to the heat pump unit 74 through the water supply path 20 and the boiling circulation path 68. Heat to hot water with heat pump unit 74. Hot water boiled by the heat pump unit 74 flows from the switching valve 71 to the intermediate connection path 27 through the heat pump return path 70b, and is again taken out from the adjustment valve 28 to the remedy circulation path 34.

  The bathtub water taken into the bathtub circulation path 41 from the bathtub 14 rises in temperature while passing through the memory heat exchanger 36, returns to the bathtub 14, and raises the hot water temperature in the bathtub 14.

  In this way, when the bath water is replenished, the switching valve 71 is switched to the connection between the outlet side of the heat pump unit 74 and the intermediate connection path 27, and the adjustment valve 28 is adjusted to take out hot water from the intermediate connection path 27. By operating the boiling circulation pump 75, a closed circulation circulation path 34 can be formed between the heat pump unit 74 and the additional heat exchanger 36 without passing through the hot water storage tank 17, and the heat pump By operating the unit 74, the hot water boiled by the heat pump unit 74 can be used to recharge the bath water, the amount of hot water used in the upper part of the hot water storage tank 17 can be reduced, and the amount of hot water available for hot water supply can be secured.

  Furthermore, in the conventional case, when the hot water decreases because the hot water at the top of the hot water tank 17 is replenished only by the hot water at the top, the heat pump unit 74 supplies water from the lower part of the hot water tank 17. The hot water is taken out and boiled in hot water and stored in the upper part of the hot water storage tank 17. In this embodiment, the hot water passing through the heat pump unit 74 can be boiled into hot water with a small amount of electric power. The hot water after passing through the heat exchanger 36 can be used effectively and energy can be saved.

  Moreover, in the conventional case, if there is no hot water in the hot water storage tank 17 or if the temperature of the hot water is lower than the temperature that can be used for reheating, the bath water cannot be reheated. In the present embodiment, even if the hot water storage tank 17 has run out of hot water, it is possible to recharge the bath water by configuring the above-described closed water circulation circulation path 34 and operating the heat pump unit 74. .

  In this case, hot water can be stored in the upper part of the hot water storage tank 17 while replenishing by sending a part of the hot water boiled in the heat pump unit 74 to the upper part of the hot water storage tank 17 through the heat pump return path 70a by the switching valve 71. Hot water can also be supplied.

  In addition, when reheating while boiling in the heat pump unit 74, the recirculation circulation pump 38 is simultaneously operated in addition to the boiling circulation pump 75 of the heat pump unit 74, so that the boiling in the recirculation circulation path 34 is performed. The flow rate per minute can be increased.

  Next, the case where there is hot water supply during the chasing will be described with reference to FIG.

  As shown by the black display (including the broken line) and the arrow (including the broken line) of the piping path in FIG. 3, for example, during the reheating with the first reheating function shown in FIG. The hot water supply pipe 56 of the hot water supply pipe 56 is being recirculated in the recirculation circulation path 34 so as to return to the hot water storage tank 17 through the hot water take-out path, the recuperation heat exchanger 36 and the water supply path 20. By opening a hot water tap or the like disposed on the downstream side, hot water whose temperature has decreased through the heat exchanger 36 for remedy flows from the water supply path 20 to the mixing valve 52 and is used for hot water supply.

  Therefore, it is possible to effectively use the medium-temperature water whose temperature has been lowered by heat exchange, to reduce the amount of hot water used in the upper part of the hot water storage tank 17, and to secure the amount of hot water that can be used for hot water supply.

  Moreover, since the amount of intermediate warm water returning to the hot water storage tank 17 can be reduced, the boiling of the intermediate warm water in the heat pump unit 74 can be reduced at the time of boiling in the subsequent boiling time zone. The boiling efficiency can be improved.

  Further, by providing a temperature sensor in the connecting pipe 20c, monitoring the temperature, and controlling the regulating valve 28 so that the temperature is lower than the temperature used for hot water supply, it becomes possible to use the medium-temperature water more efficiently.

  Next, initial water supply to the hot water storage tank 17 after the hot water supply device 11 is installed will be described with reference to FIG.

  At the initial stage, the on-off valve 23 of the water supply path 20 is closed. The water supplied by opening the stop cock on the upstream side of the water supply path 20 is in the order of the water supply pipe 20b of the water supply path 20, the heat pump forward path 69 of the boiling circulation path 68, the heat pump unit 74, and the heat pump return path 70. Flowing.

  At this time, high-pressure water flows through the water channel, and the air in the boiling heat exchanger of the heat pump unit 74 can be reliably pushed out and extracted. Therefore, with the water supply operation to the hot water storage tank 17, the air can be vented without the need for air venting in the heat exchanger for boiling of the special heat pump unit 74, and circulation for boiling due to air trapping at the time of boiling. Since the water cannot be circulated through the path 68, no abnormality occurs, and the work of the installer can be facilitated. Further, even when the user supplies water from an empty state of the hot water storage tank 17, the air can be vented in the same manner, and product failures and abnormalities can be prevented.

  Further, the water that has flowed to the heat pump return path 70 flows from the switching valve 71 to the heat pump return path 70c and the remedy circulation path 34 to the remedy heat exchanger 36, and from the remedy circulation path 34 to the water supply path 20 It flows to the lower part of the hot water storage tank 17 through the water supply pipe 20a.

  At this time, high-pressure water flows in the water channel, and the air in the heat exchanger for remedy 36 can be reliably pushed out and extracted. Therefore, along with the water supply operation to the hot water storage tank 17, the air can be vented without special air venting treatment in the heat exchanger 36 for reheating, and the recirculation path 34 for reheating causes air trapping during reheating. Since the hot water cannot be circulated, no abnormality occurs, and the work of the installer can be facilitated. Further, even when the user supplies water from an empty state of the hot water storage tank 17, the air can be vented in the same manner, and product failures and abnormalities can be prevented.

  When the initial water supply to the hot water storage tank 17 is completed, the on-off valve 23 is opened. As a result, water can be supplied to the hot water storage tank through the water supply pipe 20a of the water supply path 20.

  The on-off valve 23 may be electrically opened or closed, or may be manually opened / closed.

  When the on-off valve 23 is operated manually, there is a possibility that the on-off valve 23 may be forgotten to be opened after the initial water supply to the hot water storage tank 17 is completed. Even if the heat pump unit 74 performs a boiling operation without opening the on-off valve 23, the water below the hot water storage tank 17 flows from the boiling circulation path 68 to the heat pump unit 74 through the check valve 24. The hot water can be stored normally in the hot water storage tank 17.

  Further, when the hot water supply passage 56 is opened without opening the on-off valve 23, water supplied from the water supply passage 20 is supplied to the water supply pipe 20b, the heating pump forward route 69 of the boiling circulation route 68, the heat pump unit 74, and the heat pump return route. 70, the switching valve 71, the remedy circulation path 34, the remedy heat exchanger 36, and the connection pipe 20c to the water side of the mixing valve 52. At this time, if the boiling operation is performed with the heat pump unit 74, the boiling temperature in the heat pump unit 74 is suddenly decreased, and it is detected that the on-off valve 23 is closed and this is notified to the user. Can do. In addition, even when the heat pump unit 74 is not in boiling operation, it detects the flow of water into the heat pump unit 74 or detects that the on-off valve 23 is closed based on the water temperature of the temperature sensor, This can be notified to the user.

It is a block diagram which shows the reheating of the bathtub water by the 1st reheating function of the hot water supply apparatus which shows one embodiment of this invention. It is a block diagram which shows the reheating of the bathtub water by the 2nd reheating function of a hot-water supply apparatus same as the above. It is a block diagram which shows the hot water supply in the reheating of the bathtub water of a hot-water supply apparatus same as the above. It is a block diagram which shows the initial water supply to the hot water storage tank of a hot-water supply apparatus same as the above.

11 Water heater
13 Outdoor unit
17 hot water storage tank
26 Upper connection path
27 Intermediate connection path
28 Regulating valve
29 hot water supply route
34 Memorial circulation route
36 add焚用heat exchanger
68 Boiling circulation path
69 Heat pump route
70 Heat pump return path
71 selector valve
74 Heat pump unit
75 Boiling circulation pump
81 Control unit

Claims (1)

A hot water storage tank,
An upper connection path connected to the upper part of the hot water storage tank;
An intermediate part connection path connected to an intermediate part in the vertical direction of the hot water storage tank;
An adjustment valve for adjusting and taking out the mixing ratio of the hot water in the upper part of the hot water storage tank taken out from the upper connection path and the hot water in the intermediate part of the hot water storage tank taken out from the intermediate part connection path;
A hot water supply path for supplying hot water taken out through the regulating valve,
One of the heat pump unit that boils hot water, the heat pump going-out path that connects the inlet side of the heat pump unit and the lower part of the hot water storage tank, and the outlet side of the heat pump unit, the upper part of the hot water tank, and the intermediate part connecting path A boiling circulation path having a heat pump return path to be switched to and connected to one side, and an outdoor unit provided with a boiling circulation pump provided in the boiling circulation path;
A switching valve for switching the connection of the heat pump return path of the circulation path for boiling to one of the upper part of the hot water storage tank and the intermediate part connection path;
A heat exchanger for remedies through which bath water is circulated;
A recirculation path for remedy connected from the hot water supply path to a heat pump outbound path of the recirculation path for boiling through the recuperation heat exchanger,
When the bath water is replenished, the switching valve is switched to the connection between the outlet side of the heat pump unit and the intermediate part connection path, and the adjustment valve is adjusted so as to take out hot water only from the intermediate part connection path, and the heat pump actuates the boiling upper circulation pump actuates the unit, the control that make up the add焚用circulation path閉水path between the hot water storage tank and the heat pump unit without passing through said add焚用heat exchanger And a hot water supply device.

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