JP2009210205A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heater 11 suppressing consumption of heat in a hot water storage tank 17 and reducing usage of hot water of an upper part of the hot water storage tank 17. <P>SOLUTION: An upper taking-out pathway 25 is formed to take out hot water of the upper part in the hot water storage tank 17. An intermediate pathway 26 is formed to return the hot water passing through a heat exchanger 44 for reheating to an intermediate part of the hot water storage tank 17, and a circulation pathway 27 is formed to connect the intermediate pathway 26 and the hot water supply pathway 30. A mixing valve 29 is disposed to adjust a mixing ratio of the hot water circulated from the intermediate pathway 26 to the hot water supply pathway 30 through the circulation pathway 27 and the hot water taken out from the upper part of the hot water storage tank 17 through the upper taking-out pathway 25. The circulated hot water of which a temperature is lowered in passing through the heat exchanger 44 for reheating, and the hot water of high temperature of the upper part of the hot water storage tank 17 are mixed by the mixing valve 29 to be reused in reheating, thus the consumption of heat in the hot water storage tank 17 is suppressed. Since the hot water of the upper part of the hot water storage tank 17 is used only to add the heat to the reused hot water, the usage of the hot water of the upper part of the hot water storage tank 17 is reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water supply apparatus that utilizes hot water in a hot water storage tank for hot water supply and heat exchange with a heat load.

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

When reheating bath water using hot water in the hot water storage tank in this way, when using a heat exchanger for reheating placed outside the hot water storage tank, the hot water in the hot water storage tank is Mixing from the tank upper part and the middle part, or taking out from the tank middle part, sending the hot water taken out to the heat exchanger to exchange heat with the hot water in the bathtub, and then storing all the hot water after the heat exchange Return to the tank (for example, see Patent Document 1).
Japanese Patent Laying-Open No. 2008-20103 (page 7-8, FIG. 1)

  In the case of the hot water supply apparatus described above, the hot water that has exchanged heat with the hot water in the bathtub is heated by a heat exchanger, so it becomes medium-temperature water (temporarily about 40 ° C. to 65 ° C.). Alternatively, it will be returned to the bottom of the tank.

  Therefore, if the temperature of the hot water at the top of the tank is 80 ° C. and the temperature of the water at the position where the hot water used for reheating is returned to the hot water storage tank is 10 ° C., hot water at 80 ° C. is sent to the heat exchanger. When the intermediate temperature water that has been deprived of heat by the heat exchanger and has reached about 50 ° C is returned to the hot water storage tank, 50 ° C hot water is mixed with 10 ° C water at the return port of the hot water storage tank. The water temperature rises to about 20 ° C. Therefore, the medium-temperature water after being used for reheating is mixed with water, resulting in water at a temperature that cannot be used as it is for hot water supply. That is, the amount of heat of the medium-temperature water after being used for chasing is only used for increasing the temperature of the water and is wasted.

  In addition, when the bathtub is reheated, the amount of hot water used in the hot water storage tank increases, and the medium-temperature water that can be used as hot water as described above is mixed with water and cannot be used as hot water as it is. Since water is used, hot water having a temperature that can be used as hot water supply (temporarily about 42 ° C.) is reduced. That is, a large amount of water whose temperature is higher than the water supply temperature and cannot be used as hot water as it is is stored in the hot water storage tank.

  Furthermore, when the water in the hot water storage tank is boiled using a heat pump unit in order to make the temperature of the water in the lower part of the tank higher than the water supply temperature, the boiling efficiency is increased by the temperature of the water to be boiled up. (COP) decreases.

  This invention is made in view of such a point, and it aims at providing the hot water supply apparatus which can suppress consumption of the calorie | heat amount in a hot water storage tank, and can reduce the usage-amount of the hot water of the upper part of a hot water storage tank.

  The hot water supply device according to claim 1 is a hot water storage tank for storing hot water, a heat exchanger disposed outside the hot water storage tank for exchanging heat from the hot water storage tank side with a heat load side, and the hot water storage tank. An upper extraction path for removing hot water from the hot water storage tank, a hot water supply path connected between the upper extraction path and the heat exchanger, and hot water passing through the heat exchanger in the vertical direction of the hot water storage tank An intermediate part intake path that returns to the intermediate part of the intermediate part, a circulation path that connects the intermediate part intake path and the hot water supply path, and circulates from the intermediate part intake path to the hot water supply path via the circulation path A mixing valve that adjusts the mixing ratio of hot water taken out from the upper part of the hot water storage tank via the upper take-out path for hot water, and a controller that controls the temperature of hot water flowing from the hot water supply path to the heat exchanger by the mixing valve; Has Than is.

  The hot water supply device according to claim 2 is the hot water supply device according to claim 1, wherein the heat pump unit boils hot water, the boiling extraction path for guiding the hot water on the hot water storage tank side to the heat pump unit, and the boiling extraction path. A connection path that connects the intermediate section intake path to the intermediate section intake path, an adjustment valve that adjusts the flow rate of hot water flowing from the intermediate section intake path to the boiling extraction path via the connection path, and the heat pump unit. A boiling intake path capable of returning the passed hot water to the hot water storage tank side, and a temperature detection means for detecting the temperature of the hot water at least near the position where the intermediate intake path is connected to the hot water storage tank And when the temperature of the hot water detected by the temperature detecting means is equal to or higher than a predetermined temperature, the control unit supplies hot water taken out from the upper part of the hot water storage tank to the hot water supply path via the upper take-out path. The mixing valve was controlled so as to be cut off, and the regulating valve was controlled so as to take out hot water from the intermediate part intake path to the boiling outlet path via the connection path and passed through the heat pump unit. The hot water is controlled to return to the hot water storage tank side through the boiling intake path.

  The hot water supply device according to claim 3 is the hot water supply device according to claim 1, wherein the heat pump unit boils hot water, the boiling extraction path for guiding the hot water on the hot water storage tank side to the heat pump unit, and the boiling extraction path. A connection path that connects the intermediate section intake path to the intermediate section intake path, an adjustment valve that adjusts the flow rate of hot water flowing from the intermediate section intake path to the boiling extraction path via the connection path, and the heat pump unit. A boiling intake path capable of returning the passed hot water to the upper part of the hot water storage tank, and temperature detection for detecting the temperature of the hot water at least near the position where the intermediate part intake path is connected to the hot water storage tank And when the temperature of the hot water detected by the temperature detection means is lower than a predetermined temperature, the control unit supplies hot water from the intermediate part intake path to the boiling outlet path via the connection path. The Ri controls the adjustment valve to issue, and controls the hot water passed through the heat pump unit to return via the introduction path preparative said boiling above the top of the hot water storage tank.

  The hot water supply apparatus according to claim 4 is the hot water supply apparatus according to claim 1, wherein the heat pump unit boils hot water, the boiling extraction path for guiding the hot water on the hot water storage tank side to the heat pump unit, and the boiling extraction path. A connection path that connects the intermediate section intake path to the intermediate section intake path, an adjustment valve that adjusts the flow rate of hot water flowing from the intermediate section intake path to the boiling extraction path via the connection path, and the heat pump unit. A plurality of boiling-up intake paths capable of returning the hot water passed to the upper and intermediate portions of the hot water storage tank, a switching valve for switching to any one of these boiling-up intake paths, and at least the intermediate Temperature detecting means for detecting the temperature of hot water in the vicinity of a position where the part intake path is connected to the hot water storage tank, and the controller detects the temperature of the hot water detected by the temperature detecting means at a predetermined temperature. If so, the mixing valve is controlled so that hot water taken out from the upper part of the hot water storage tank via the upper take-off path is cut off from the hot water supply path, and the boiling point is removed from the intermediate part take-in path via the connection path. The adjustment valve is controlled to take hot water into the upper take-out path, and the switching valve is controlled to switch to the boiling take-in path that returns the hot water that has passed through the heat pump unit to the intermediate portion of the hot water storage tank. If the temperature of the hot water detected by the temperature detecting means is lower than a predetermined temperature, the adjusting valve is arranged so that hot water is taken out from the intermediate part intake path to the boiling outlet path via the connection path. In addition to controlling, the switching valve is controlled so that the hot water that has passed through the heat pump unit is switched to the boiling intake path that returns the hot water to the upper part of the hot water storage tank.

  According to the hot water supply apparatus of the first aspect, the circulating hot water after passing through the heat exchanger and the hot water at the top of the hot water storage tank are mixed with the mixing valve, and the heat exchange in the heat exchanger is repeated. By using it, the consumption of heat in the hot water storage tank can be suppressed, and the amount of hot water in the upper part of the hot water storage tank can be reduced because the hot water in the upper part of the hot water storage tank is used for the amount of heat added to the reused hot water. .

  According to the hot water supply device according to claim 2, in addition to the effect of the hot water supply device according to claim 1, if the temperature of the hot water detected by the temperature detection means is equal to or higher than a predetermined temperature, the mixing valve passes through the upper extraction path. Hot water taken out from the upper part of the hot water storage tank is shut off from the hot water supply path, hot water is taken out from the intermediate part intake path through the connecting path via the connection path to the hot water extraction path, and the hot water that has passed through the heat pump unit is stored in the hot water storage tank. When the temperature of the hot water used for heat exchange in the heat exchanger is sufficiently high near the position where the intermediate intake path is connected to the hot water storage tank, the hot water storage The hot water used for heat exchange in the heat exchanger can be circulated and reused without using the hot water at the top of the tank.

  According to the hot water supply device of the third aspect, in addition to the effect of the hot water supply device of the first aspect, if the temperature of the hot water detected by the temperature detecting means is lower than a predetermined temperature, the adjustment valve controls the intermediate point through the connection path. The hot water is taken out from the part intake path to the boiling extraction path, and the hot water that has passed through the heat pump unit is returned to the upper part of the hot water storage tank via the boiling intake path for heat exchange in the heat exchanger. When the temperature of the hot water used is low in the vicinity of the position where the intermediate portion intake path is connected to the hot water storage tank, the hot water can be returned to the upper portion of the hot water storage tank as the amount of heat without being mixed with the water in the hot water storage tank.

  According to the hot water supply apparatus of claim 4, in addition to the effect of the hot water supply apparatus of claim 1, if the temperature of the hot water detected by the temperature detection means is equal to or higher than a predetermined temperature, the mixing valve passes through the upper extraction path. Hot water taken out from the upper part of the hot water storage tank was shut off from the hot water supply path, and hot water was taken out from the intermediate part intake path through the connecting path via the connection path by the adjustment valve, and passed through the heat pump unit by the switching valve. By switching to the boiling intake path that returns the hot water to the middle part of the hot water storage tank, the temperature of the hot water used for heat exchange in the heat exchanger is near the position where the intermediate part intake path is connected to the hot water storage tank. When the temperature is sufficiently high, the hot water used for heat exchange in the heat exchanger can be circulated and reused without using the hot water in the upper part of the hot water storage tank, and the temperature of the hot water detected by the temperature detecting means is lower than the predetermined temperature. For example, hot water is taken out from the intermediate part intake path to the boiling outlet path via the connection path by the adjusting valve, and the hot water having passed through the heat pump unit is returned to the upper part of the hot water storage tank by the switching valve. When the temperature of the hot water used for heat exchange in the heat exchanger is low near the position where the intermediate intake path is connected to the hot water storage tank, the amount of heat is not mixed with the hot water in the hot water storage tank. It can be returned to the top of the hot water storage tank.

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

  FIG. 1 shows a first embodiment, and a 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 purging bathtub water stretched on a bathtub 14. Yes.

  The main unit 12 has a hot water storage tank 17 for storing hot water. The hot water storage tank 17 includes an upper position of the hot water storage tank 17 and a 1/5 position and a 2/5 position corresponding to the capacity from the upper portion of the hot water storage tank 17. The thermistors 18a to 18f as temperature detecting means for detecting the hot water temperature in the hot water storage tank 17 are disposed at the 3/5 position, the 4/5 position, and the lower position of the hot water storage tank 17, respectively.

  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 and a check valve 22 for restricting the backflow.

  An upper take-out path 25 is connected to the upper part of the hot water storage tank 17, and the intermediate part intake path is located between the thermistor 18b at the 1/5 position and the thermistor 18c at the 2/5 position, which is an intermediate position in the vertical direction of the hot water tank 17. An intermediate part path 26 having a function and a function of an intermediate part extraction path is connected, and a circulation path 27 is connected to the intermediate part path 26. The circulation path 27 is provided with a check valve 28 that allows a part of hot water taken from the intermediate passage 26 to the intermediate portion of the hot water storage tank 17 only in the take-out direction. The upper take-out path 25 and the circulation path 27 are connected to a mixing valve 29 which is an electric valve. The hot water in the upper part of the hot water storage tank 17 to be taken out from the upper take-out path 25 and the hot water storage tank 17 from the intermediate part path 26 by the mixing valve 29. A part of the hot water returned to the water is taken out by adjusting the mixing ratio with the hot water taken out so as to circulate through the circulation path 27. The mixing ratio that can be adjusted by the mixing valve 29 includes the case where either one is 100% and the other is 0%. The mixing valve 29 is connected to a hot water supply path 30 for supplying hot water taken out. The hot water supply path 30 is provided with an extraction temperature sensor 31 as an extraction temperature detection means for detecting the temperature of the hot water. The upper extraction path 25, the intermediate path 26, the circulation path 27, the mixing valve 29, and the hot water supply path 30 form an extraction path 32 for extracting hot water from the hot water storage tank 17.

  Further, the hot water supply path 30 (extraction path 32) and the water supply path 20 are respectively connected to a mixing valve 34 as hot water temperature adjusting means for hot water supply and a mixing valve 35 as hot water temperature adjusting means for bathtubs. These mixing valves 34 and 35 mix hot water from the hot water supply path 30 (extraction path 32) and water from the water supply path 20 to supply hot water at a predetermined temperature. The mixing ratio that can be adjusted by the mixing valves 34 and 35 includes the case where either one is 100% and the other is 0%.

  The hot water supply path 30 and the water supply path 20 connected to the mixing valves 34 and 35 are provided with check valves 36 and 37 for restricting the backflow to the hot water supply path 30 side and the water supply path 20 side, respectively.

  The hot water mixing valve 34 supplies hot water having a set hot water temperature set by, for example, a main remote controller installed in a kitchen or the like, a bathroom remote controller installed in a bathroom, or the like. A hot water supply passage 38 for supplying hot water to a predetermined hot water supply place is connected to the mixing valve 34 for hot water supply, and a flow rate sensor 39 for measuring the flow rate and a hot water supply temperature sensor 40 for detecting the temperature are provided in the hot water supply passage 38. Yes.

  The mixing valve 35 for the bathtub supplies hot water at a hot water set temperature set by, for example, a main remote controller installed in a kitchen or the like, a bathroom remote controller installed in a bathroom, etc. Supply hot water at a temperature according to the ability to repel water. This bathtub mixing valve 35 is connected to a bathtub hot water supply path 41 for supplying hot water to the bathtub 14, and this bathtub hot water supply path 41 is provided with a water supply electromagnetic valve or the like as a hot water supply means for bathtubs for opening and closing the flow path. 42 is arranged.

  In addition, on the downstream side of the connection point of the mixing valves 34 and 35 in the hot water supply path 30 (extraction path 32), there is a check valve 43 that restricts the backflow to the upstream side, and the bathtub water in the bathtub 14 on the heat load side. A return path 45 is connected via a heat exchanger 44 for heat exchange as a heat exchanger for heat exchange to return the hot water that has passed through the heat exchanger 44 for heat return to the hot water storage tank 17. In this return path 45, hot water is taken out from the hot water storage tank 17 through the extraction path 32, and the hot water that has passed through the heat exchanger 44 for return is returned to the intermediate portion of the hot water storage tank 17 through the return path 45 and the intermediate path 26. A recirculation circulation pump 46 for circulating hot water is provided.

  The return path 45 is connected to the intermediate path 26. In addition, the return path 45 and the intermediate path 26 form an intake path 52 that returns the hot water that has passed through the reheating heat exchanger 44 to the intermediate part of the hot water storage tank 17.

  The take-out path 32 and the take-in path 52 form a memorial circuit 53 as a heat load circuit.

  In addition, the memorial heat exchanger 44 and the bathtub 14 are connected by a circulation path 54 for the bathtub. The circulation path 54 for the bathtub includes a return pipe 55 that takes in the bathtub water of the bathtub 14 and guides it to the heat exchanger 44 for remedy, and a forward pipe 56 that guides the bathtub water that has passed through the heat exchanger 44 for remedy to the bathtub 14. Have. The return pipe 55 includes a thermistor 57 for detecting the temperature of the bathtub water taken from the bathtub 14, a pressure sensor 58 for detecting the water level of the bathtub 14, a switching valve 59 for switching the flow path when automatically filling the bathtub 14, A bath circulation pump 60 for circulating the bath water and a flow switch 61 for detecting the bath water circulation are provided. The forward pipe 56 is provided with a thermistor 62 that detects the temperature of bathtub water introduced into the bathtub 14. The thermistor 62 detects the temperature of the bath water introduced into the bathtub 14, but since this temperature is substantially equal to the temperature of the hot water after the heat exchange flowing through the return path 45, the thermistor 62 returns The temperature of the hot water flowing through the path 45 is indirectly detected.

  The switching valve 59 is connected to a hot water supply passage 41 for the bathtub, and hot water supplied from the hot water supply passage 41 for the bathtub can be supplied to the bathtub 14 through one pipe of the return pipe 55 or two pipes of the return pipe 55 and the forward pipe 56. It has become.

  In addition, a relief valve 65 that releases excess pressure during boiling is connected to the upper outlet passage 25 of the hot water storage tank 17, and this relief valve 65 is connected to a drainage passage 66.

  Further, the hot water storage tank 17 side and the outdoor unit 13 are connected by a boiling circuit 70. The boiling circuit 70 includes a boiling extraction path 71 that connects the lower part of the hot water tank 17 and the inlet side of the outdoor unit 13, and a return path for boiling that connects the outlet side of the outdoor unit 13 and the hot water tank 17 side. Has 72. The boiling extraction path 71 is configured to drain to a predetermined drainage place via a valve 73.

  Further, a switching valve 75 which is a distribution valve as switching means is connected to the return path 72 for boiling, and the switching valve 75 is connected to the upper intake path 76 for boiling connected to the upper part of the hot water storage tank 17, A boiling intermediate portion intake passage 77 connected between the 3/5 position and the 4/5 position, which is an intermediate position in the vertical direction of the hot water storage tank 17, is connected. The switching valve 75 switches the boiling return path 72 so that either the boiling upper intake path 76 or the boiling intermediate intake path 77 is connected. The boiling return path 72, the boiling upper intake path 76, and the boiling intermediate intake path 77 are used to pass hot water that has passed through the outdoor unit 13 at a plurality of positions in the upper and intermediate portions of the hot water storage tank 17. A plurality of boiling intake paths 78 to be returned are formed.

  Further, the outdoor unit 13 is provided with a heat pump unit 81 as a boiling means for boiling hot water. The heat pump unit 81 has a refrigerant circuit including a compressor, a boiling heat exchanger 82 that functions as a condenser, an expansion valve, an evaporator, and the like. A boiling circuit 70 is connected to the boiling heat exchanger 82 of the heat pump unit 81. On the upstream side of the boiling heat exchanger 82 of the heat pump unit 81, a boiling circulation pump 83 for circulating the water below the hot water storage tank 17 from the boiling extraction path 71 side to the boiling return path 72 side. It is arranged. Further, the heat pump unit 81 passed through an intake temperature sensor 84 as boiling intake temperature detecting means for detecting the temperature of hot water taken into the boiling extraction path 71 and a boiling heat exchanger 82. A hot water temperature sensor 85 as a boiling hot water temperature detecting means for detecting the temperature of the hot water is provided.

  Further, the hot water supply device 11 takes out from the upper part of the hot water storage tank 17 via the upper extraction path 25 for the circulating hot water circulating from the intermediate path 26 to the hot water supply path 30 via the circulation path 27 based on the detection of the thermistor 62. A control unit 88 is provided for controlling the mixing valve 29 so as to adjust the mixing ratio of hot water. More specifically, when the temperature of the circulating hot water indirectly detected by the thermistor 62 is higher, the control unit 88 reduces the amount of hot water in the upper portion of the hot water storage tank 17 to be taken out from the upper outlet path 25, and the temperature of the circulating hot water becomes lower. The mixing valve 29 is controlled to increase the amount of hot water in the upper part of the hot water storage tank 17 taken out from the upper take-out path 25.

  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 81 and the boiling circulation pump 83 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 boiling circulation pump 83, the water in the lower part of the hot water storage tank 17 is taken out from the boiling take-out path 71 and sent to the heat pump unit 81, and the water boiled by the heat pump unit 81 is sent from the return path 72 for boiling. Return to hot water tank 17.

  When the temperature of the hot water discharged from the heat pump unit 81 of the outdoor unit 13 detected by the hot water temperature sensor 85 is low, the hot water is switched to the intermediate intake passage 77 for boiling by the switching valve 75, and the intermediate hot water is returned to the intermediate portion of the hot water storage tank 17. Prevents the temperature drop of hot water at the top of the hot water storage tank 17. When the hot water discharge temperature from the heat pump unit 81 of the outdoor unit 13 detected by the hot water temperature sensor 85 is equal to or higher than the boiling target temperature, the switching valve 75 switches to the boiling upper intake path, and Supply hot water above the boiling target temperature and store hot water. Thereby, low temperature hot water is not stored in the upper part of the hot water storage tank 17, and the hot water storage temperature can be increased.

  Next, the hot water supply operation will be described.

  By opening a hot water tap or the like disposed downstream of the hot water supply passage 38, hot water in the hot water storage tank 17 is pushed out by the supply water pressure, and hot water is stored through the upper outlet passage 25, the intermediate passage 26, the mixing valve 29, and the hot water supply passage 30. Hot water taken out from the tank 17 and water supplied from the water supply path 20 are mixed by the hot water mixing valve 34 to obtain hot water having a hot water supply set temperature, and this hot water is supplied from the hot water supply passage 38. The hot water taken out to the hot water supply passage 30 is taken out by adjusting the mixing ratio of the hot water in the upper portion of the hot water storage tank 17 taken out from the upper take-out passage 25 and the hot water in the intermediate portion of the hot water storage tank 17 taken out from the intermediate passage 26 by the mixing valve 29. .

  Next, use of the bathtub 14 will be described.

  When the hot water is filled in the bathtub 14, 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 42, and the upper outlet path 25, the intermediate path 26, the mixing valve 29 and the hot water path 30 The hot water taken out from the hot water storage tank 17 and the water supplied from the water supply path 20 are mixed by the mixing valve 35 for the bathtub to obtain hot water at a preset temperature, and this hot water is supplied. Hot water is supplied to the bathtub 14 through a bathtub circulation path 54 that forms part of the bathtub hot water supply path 41. When filling the bathtub 14 with hot water, by switching the hot water to flow through the return pipe 55 and the forward pipe 56 with the switching valve 59, a predetermined amount of hot water can be quickly supplied and filled. When filling the bathtub 14 with hot water, the switching valve 59 is switched so that hot water flows only to one pipe of the outgoing pipe 56, and hot water is supplied while monitoring the water level with the pressure sensor 58 of the return pipe 55. The hot water can be filled so that the water level exactly matches the set water level. Moreover, the hot water taken out to the hot water supply path 30 is adjusted by the mixing valve 29 in the mixing ratio between the hot water in the upper part of the hot water storage tank 17 taken out from the upper outlet path 25 and the hot water in the middle part of the hot water storage tank 17 taken out from the intermediate part path 26. And take it out.

  Then, after filling the bathtub 14, the bathtub circulation pump 60 is operated every predetermined time to circulate the bathtub water in the bathtub 14 in the circulation path 54 for the bathtub, and the temperature of the bathtub water is detected by the thermistor 57. Then, it is monitored whether there is a need for heat insulation, that is, a chasing action.

  Further, when the temperature of the bathtub water falls below the set temperature, the reheating operation is automatically performed, and the reheating operation is also performed by manual operation of a bathtub remote controller or the like.

  In the reheating operation, as shown by the black display of the piping path in FIG. 1 and the arrow, first, the bathtub circulation pump 60 is operated, and the bathtub water is taken into the bathtub circulation path 54 to perform heat exchange for reheating. Circulate in vessel 44. In this state, by operating the recirculation circulation pump 46, the hot water in the hot water storage tank 17 is taken out through the upper extraction path 25, the intermediate path 26, the mixing valve 29, and the hot water supply path 30 (extraction path 32). It is sent to the heat exchanger 44 for firewood, and heat is exchanged between the hot water from the hot water storage tank 17 and the bathtub water from the bathtub 14 by the heat exchanger 44 for recuperation, and the bathtub water whose temperature has been increased by this heat exchange is transferred to the bathtub 14. Return and raise the hot water temperature in the bathtub 14. The hot water to be taken out to the hot water supply path 30 (extraction path 32) is circulated through the circulation path 27 from the hot water in the hot water storage tank 17 taken out from the upper extraction path 25 and the intermediate path 26 through the circulation path 27 by the mixing valve 29. The mixing ratio with circulating hot water, which is medium-temperature water whose temperature has dropped after passing through the exchanger 44, is adjusted and taken out according to the temperature of the circulating hot water detected indirectly by the thermistor 62.

  Further, the hot water from the hot water storage tank 17 that has passed through the heat exchanger for remedy 44 and has fallen in temperature returns a part thereof to the hot water storage tank 17 through the return path 45 and the intermediate path 26.

  At this time, for example, if the circulation amount of the recirculation circulation pump 46 is 10L, and the amount of circulating hot water to be reused is 8L, the amount of hot water returning to the hot water storage tank 17 via the intermediate path 26 will be 2L. .

  In this way, the hot water at the top of the hot water storage tank 17 is mixed with the circulating hot water (temporarily about 40 ° C. to 65 ° C.) after passing through the heat exchanger for remedy 44 and the temperature is lowered, By increasing the temperature of the hot water used for reheating and re-using heat in the reheating heat exchanger 44, that is, for reheating, the consumption of heat in the hot water storage tank 17 can be suppressed and reused. Since the hot water in the upper part of the hot water storage tank 17 is used for the amount of heat added to the medium-temperature water, the amount of hot water in the upper part of the hot water storage tank 17 can be reduced.

  In addition, since the hot water used for reheating is reused and used again for reheating, it is used for reheating as compared with the conventional configuration in which all hot water used for reheating is temporarily returned to the hot water storage tank 17. The consumption rate of hot water can be reduced. For this reason, even if it reheats, the fall of the amount of hot water supplies which can be used can be prevented.

  In addition, in the conventional configuration in which all hot water that has been used for reheating is returned to the hot water storage tank 17 once, the hot water used for reheating is heated when the temperature in the hot water storage tank 17 near the return port is water. As a result, the temperature of the water rises and the hot water in the hot water storage tank 17 cannot be used as hot water supply as it is, and a large amount of hot water in the hot water storage tank 17 cannot be used as hot water supply as it is. Therefore, for example, when the water in the hot water storage tank 17 is boiled using the heat pump unit 81, the amount of medium-temperature water to be boiled increases, and the boiling efficiency (COP) decreases. In the present embodiment, since only a part of the hot water used for reheating is returned to the hot water storage tank 17, the amount of medium-temperature water that can be generated in the hot water storage tank 17 can be reduced, and hot water at a temperature that can be used as hot water supply is reduced. This Can be prevented, and reduction in boiling efficiency can be reduced.

  In addition, the hot water used for reheating is mixed with the hot water in the upper part of the hot water storage tank 17 and reused for reheating. Therefore, even if there is no need to adjust the rotational speed of the pump on the hot water storage tank 17 side or adjustment of the order completion. By controlling the temperature at which water is fed to the heat exchanger for dredging 44, it is possible to easily control the reheating capacity without using extra parts that adjust the flow rate and expensive pumps that can control the rotation speed, which is also advantageous in terms of cost. It becomes.

  In addition, for example, if the hot water temperature at the upper take-out position of the hot water storage tank 17 and the intermediate part take-out position of the hot water storage tank 17 is a high temperature of 90 ° C., the function of adjusting the amount of hot water for reheating on the hot water storage tank 17 side is adjusted. In a conventional configuration that does not have, a certain amount of high-temperature hot water continues to circulate in the heat exchanger for remedy 44, so that the temperature of the hot water returned to the bathtub 14 may be high-temperature hot water such as 70 ° C. or more. On the other hand, in this embodiment, even if the hot water temperature between the upper take-out position of the hot water storage tank 17 and the intermediate part take-out position of the hot water storage tank 17 is a high temperature of 90 ° C., the degree of opening adjustment of the mixing valve 29 is adjusted. Since the temperature of the hot water supplied to the heat exchanger 44 for chasing can be lowered by (variability of the chasing capability), the temperature of the hot water returning to the bathtub 14 can be reduced to an appropriate temperature.

  In addition, when the temperature of the circulating hot water is detected, the control unit 88 is provided with a detection unit that detects the temperature of the circulating hot water by substituting the thermistor 62 that detects the temperature of the hot water introduced into the bathtub 14. Compared to the case, the cost can be reduced.

  Next, FIGS. 2 to 4 show a second embodiment. Only the differences from the first embodiment will be described.

  A connection path 91 is connected to the intermediate section path 26 (return path 45), and this connection path 91, a lower extraction path 92 connected to the lower part of the hot water storage tank 17, and a pump side intake path 93 of the heat pump unit 81 are connected. The control valve 94 is a mixing valve.

  Further, the lower extraction path 92 and the pump side intake path 93 form a boiling extraction path 71.

  Further, the control unit 88 is mixed if the remaining hot water temperature near the position where the intermediate passage 26 of the hot water storage tank 17 detected by the thermistors 18a to 18f is connected, that is, in the vicinity of the outlet, is equal to or higher than a predetermined temperature. The hot water taken out from the upper part of the hot water storage tank 17 through the upper take-off path 25 is controlled by controlling the valve 29 from the hot water supply path 30, and the control valve 94 is controlled to boil from the intermediate part path 26 through the connection path 91. The hot water is taken out to the upper take-out path 71 (on the heat pump unit 81 side) and the hot water that has passed through the heat pump unit 81 is returned to the intermediate portion of the hot water storage tank 17 by controlling the switching valve 75. It has a function of switching to the upper intermediate portion intake path 77).

  Further, the control unit 88 controls the adjustment valve 94 if the remaining hot water temperature near the position where the intermediate passage 26 of the hot water storage tank 17 is detected, which is detected by the thermistors 18a to 18f, is lower than a predetermined temperature set in advance. The hot water is taken out from the intermediate path 26 to the boiling extraction path 71 (on the heat pump unit 81 side) via the connection path 91, and the hot water passing through the heat pump unit 81 is controlled by the switching valve 75 in the hot water storage tank 17. It has a function of switching to a boiling intake path 78 that returns to the upper part (boiling upper intake path 76).

  Note that the hot water returned to the hot water storage tank 17 through the boiling intake path 78 (the intermediate intake path 77 for boiling or the upper intake path 76 for boiling) is used for the heat exchange for boiling of the heat pump unit 81. Hot water that simply passes through the heater 82, that is, hot water that is not boiled by the heat pump unit 81 or hot water that is boiled through the heat exchanger 82 for heating of the heat pump unit 81, such as the control unit 88 Therefore, it is appropriately determined as necessary.

  In the reheating operation, as indicated by the black display of the piping path in FIG. 2 and the arrow, first, the bathtub circulation pump 60 is operated, and the bathtub water is taken into the bathtub circulation path 54 for reheating. Circulate through heat exchanger 44. In this state, by operating the recirculation circulation pump 46, the hot water in the hot water storage tank 17 is taken out through the upper extraction path 25, the intermediate path 26, the mixing valve 29, and the hot water supply path 30 (extraction path 32). It is sent to the heat exchanger 44 for firewood, and heat is exchanged between the hot water from the hot water storage tank 17 and the bathtub water from the bathtub 14 by the heat exchanger 44 for recuperation, and the bathtub water whose temperature has been increased by this heat exchange is transferred to the bathtub 14. Return and raise the hot water temperature in the bathtub 14. The hot water to be taken out to the hot water supply path 30 (extraction path 32) is circulated through the circulation path 27 from the hot water in the hot water storage tank 17 taken out from the upper extraction path 25 and the intermediate path 26 through the circulation path 27 by the mixing valve 29. The mixing ratio with circulating hot water, which is medium-temperature water whose temperature has dropped after passing through the exchanger 44, is adjusted and taken out according to the temperature of the circulating hot water detected indirectly by the thermistor 62. At this time, the regulating valve 94 is closed so that hot water does not flow from the intermediate path 26 (return path 45) to the connection path 91 side.

  Further, the hot water from the hot water storage tank 17 that has passed through the heat exchanger for remedy 44 and has fallen in temperature returns a part thereof to the hot water storage tank 17 through the return path 45 and the intermediate path 26.

  At this time, for example, if the circulation amount of the recirculation circulation pump 46 is 10L, and the amount of circulating hot water to be reused is 8L, the amount of hot water returning to the hot water storage tank 17 via the intermediate path 26 will be 2L. .

  As a result, the same effects as those of the first embodiment can be obtained.

  Further, when the remaining hot water temperature near the position where the intermediate passage 26 of the hot water tank 17 detected by the thermistors 18b and 18c is connected, that is, near the outlet, is higher than a predetermined temperature, the piping route of FIG. As indicated by the black display and the arrow, the opening of the mixing valve 29 is adjusted to shut off the hot water from the upper extraction path 25 to the hot water supply path 30, and the hot water flows only from the intermediate path 26 to the hot water supply path 30. And adjusting the opening of the adjusting valve 94 so that hot water flows from the intermediate path 26 (return path 45) side to the pump side intake path 93 (boiling lift path 71), and The elevating intake path 78 is switched to the elevating intermediate part intake path 77 by the switching valve 75, and the elevating circulation pump 83 of the heat pump unit 81 is operated.

  That is, a part of the hot water that has passed through the return path 45 from the memorial heat exchanger 44 flows to the intermediate path 26, and the remaining other part passes through the pump side intake path 93 (boiling lift path 71). To the heat pump unit 81. The hot water that has flowed to the intermediate path 26 circulates to the hot water supply path 30. The hot water that has flowed to the pump-side intake path 93 passes through the heat pump unit 81 and then returns to the intermediate part of the hot water storage tank 17 via the boiling intermediate intake path 77.

  For this reason, the hot water used for reheating can be reused without using the hot water at the top of the hot water storage tank 17.

  Further, by adjusting the number of rotations of the circulating pump 83 for boiling, the amount of recirculated hot water after being used for reheating can be adjusted, so that the capacity for reheating can be adjusted by this adjustment.

  Therefore, even if hot water at the top of the hot water storage tank 17 is not used, the hot water used for reheating can be reused and reheated, so the hot water used for reheating is mixed with the water in the hot water storage tank 17. The amount can be reduced, and the consumption of heat in the hot water storage tank 17 can be reduced.

  In this way, when the hot water in the upper part of the hot water storage tank 17 is hot and the temperature near the position where the intermediate passage 26 of the hot water storage tank 17 is detected detected by the thermistors 18b, 18c, etc., is hot water, When warming up and chasing can be covered, by using the middle temperature water in the middle of the hot water tank 17 before using the hot water in the upper part of the hot water tank 17, the intermediate temperature water can be reduced. Since the amount of boiling of medium temperature water decreases, the boiling efficiency can be improved.

  Further, the temperature near the position where the intermediate passage 26 of the hot water tank 17 detected by the thermistors 18b and 18c of the hot water tank 17 is lower than a predetermined temperature, and hot water is only in the upper part of the hot water tank 17. If there is not, the hot water taken out from the upper outlet passage 25 and the hot water taken out from the intermediate passage 26 by adjusting the opening of the mixing valve 29 as indicated by the black display of the piping route in FIG. The adjustment valve 94 is adjusted to flow from the intermediate path 26 (return path 45) side, and the boiling intake path 78 is boiled by the switching valve 75. By switching to the upper upper intake path 76, the boiling circulation pump 83 of the heat pump unit 81 is operated.

  That is, a part of the hot water that has passed through the return path 45 from the memorial heat exchanger 44 flows to the intermediate path 26, and the remaining other part passes through the pump side intake path 93 (boiling lift path 71). To the heat pump unit 81. The hot water flowing into the intermediate path 26 is mixed with the high-temperature hot water taken out from the upper outlet path 25 and circulated to the hot water supply path 30. The hot water that has flowed to the pump-side intake path 93 passes through the heat pump unit 81 and then returns to the upper part of the hot water storage tank 17 via the boiling upper intake path 76.

  For this reason, since the hot water used for reheating can be returned to the upper part of the hot water storage tank 17 as heat quantity without mixing (without loss) into the water, a large amount of hot water supply can be secured.

  That is, if the hot water temperature used for reheating is 80 ° C. and the hot water temperature of the medium temperature water used for reheating is 50 ° C., the heat quantity of 80 ° C. is always used in the case of a non-reusable channel. The water must be sent to the exchanger. Further, if the medium-temperature water after use is mixed with water, the amount of heat at 50 ° C. (remaining amount of heat) is used for increasing the temperature of the water in the hot water storage tank 17 and is wasted. That is, when such medium temperature water is mixed with water, it becomes medium temperature water that cannot be used as hot water as it is, and the amount of hot water that can be used as hot water decreases. In other words, a large amount of water whose temperature is higher than the water supply temperature and cannot be used as hot water as it is is stored in the hot water storage tank. Furthermore, when the water in the hot water storage tank is boiled using a heat pump unit in order to make the temperature of the water in the lower part of the tank higher than the water supply temperature, the boiling efficiency is increased by the temperature of the water to be boiled up. Decreases.

  Therefore, by reusing the hot water after reheating, it reused the heat of the circulating hot water out of the heat of 80 ° C to be sent to the heat exchanger for reheating 44, and was consumed and used for reheating. Since only the amount of heat needs to be added from the hot water storage tank 17, the amount of hot water in the hot water storage tank 17 can be reduced.

  In the second embodiment, the boiling intake path 78 is only one of the boiling upper intake path 76 and the boiling intermediate intake path 77, and the switching valve 75 is provided. The configuration may be simplified without providing. Moreover, the hot water that has passed through the heat pump unit 81 can be returned to the hot water storage tank 17 side in an arbitrary configuration.

  Further, in each of the above embodiments, when detecting the temperature of the circulating hot water, the cost is reduced by substituting the thermistor 62 that detects the temperature of the bathtub water introduced into the bathtub 14, but the return path 45 and the intermediate path Circulating hot water temperature detecting means for detecting the temperature of the circulating hot water may be provided at 26 or the like. In this case, the temperature of the circulating hot water can be detected more accurately, and the control unit 88 can perform finer control by the mixing valve 29.

  Furthermore, the heat load for exchanging heat with the hot water in the hot water storage tank 17 by the heat exchanger is not limited to the reheating of the bathtub water in the bathtub 14, but can also be applied to hot water heating.

It is a lineblock diagram of the hot-water supply device which shows a 1st embodiment of the present invention. It is a block diagram of the hot water supply apparatus which shows the 2nd Embodiment of this invention. It is a block diagram of the reheating operation | movement when the temperature of the hot water detected by the temperature detection means of the same hot-water supply apparatus is more than predetermined temperature. It is a block diagram of the reheating operation when the temperature of the hot water detected by the temperature detection means of the hot water supply apparatus is lower than a predetermined temperature.

Explanation of symbols

11 Water heater
17 Hot water storage tank
18a-18f Thermistor as temperature detection means
25 Upper extraction route
26 Intermediate route with intermediate intake route function
27 Circulation path
29 Mixing valve
30 Hot water supply route
44 Relief heat exchanger as a heat exchanger
71 Boiling extraction route
75 selector valve
78 Boiling intake route
81 heat pump unit
88 Control unit
91 Connection path
94 Regulating valve

Claims (4)

A hot water storage tank for storing hot water,
A heat exchanger disposed outside the hot water storage tank and exchanging heat from the hot water storage tank side with the heat load side;
An upper extraction path for taking out the hot water in the hot water storage tank from the hot water storage tank;
A hot water supply path connected between the upper outlet path and the heat exchanger;
An intermediate portion intake path for returning hot water that has passed through the heat exchanger to an intermediate portion in the vertical direction of the hot water storage tank;
A circulation path connecting the intermediate portion intake path and the hot water supply path;
A mixing valve for adjusting a mixing ratio of hot water taken out from the upper part of the hot water storage tank via the upper take-off path with respect to hot water circulating from the intermediate part intake path to the hot water supply path via the circulation path;
And a controller for controlling the temperature of hot water flowing from the hot water supply path to the heat exchanger by the mixing valve. A heat pump unit for boiling water,
An extraction path for boiling that guides hot water on the hot water storage tank side to the heat pump unit;
A connection path connecting the take-up path for boiling and the intermediate section intake path;
An adjustment valve that adjusts the flow rate of hot water flowing from the intermediate part intake path to the boiling-up extraction path via the connection path;
A boiling intake path capable of returning the hot water that has passed through the heat pump unit to the hot water storage tank side;
Temperature detection means for detecting the temperature of hot water in the vicinity of the position where at least the intermediate portion intake path is connected to the hot water storage tank;
The control unit controls the mixing valve so that the hot water taken out from the upper part of the hot water storage tank is shut off from the hot water supply path via the upper take-off path if the temperature of the hot water detected by the temperature detecting means is equal to or higher than a predetermined temperature. And the control valve is controlled so that hot water is taken out from the intermediate part intake path to the boiling outlet path via the connection path, and the hot water that has passed through the heat pump unit is moved to the hot water storage tank side. The hot water supply device according to claim 1, wherein the hot water supply device is controlled so as to be returned through a boiling intake path. A heat pump unit for boiling water,
An extraction path for boiling that guides hot water on the hot water storage tank side to the heat pump unit;
A connection path connecting the take-up path for boiling and the intermediate section intake path;
An adjustment valve that adjusts the flow rate of hot water flowing from the intermediate part intake path to the boiling-up extraction path via the connection path;
A boiling intake path capable of returning the hot water that has passed through the heat pump unit to the upper part of the hot water storage tank;
Temperature detection means for detecting the temperature of hot water in the vicinity of the position where at least the intermediate portion intake path is connected to the hot water storage tank;
If the temperature of the hot water detected by the temperature detecting means is lower than a predetermined temperature, the control unit adjusts the hot water to be taken out from the intermediate portion intake path to the boiling outlet path via the connection path. The hot water supply apparatus according to claim 1, wherein the hot water that has passed through the heat pump unit is controlled to be returned to the upper part of the hot water storage tank via the boiling intake path while controlling the valve. A heat pump unit for boiling water,
An extraction path for boiling that guides hot water on the hot water storage tank side to the heat pump unit;
A connection path connecting the take-up path for boiling and the intermediate section intake path;
An adjustment valve that adjusts the flow rate of hot water flowing from the intermediate part intake path to the boiling-up extraction path via the connection path;
A plurality of boiling-up intake paths capable of returning the hot water that has passed through the heat pump unit to each of an upper part and an intermediate part of the hot water storage tank;
A switching valve for switching to either one of these boiling intake paths;
Temperature detection means for detecting the temperature of hot water in the vicinity of the position where at least the intermediate portion intake path is connected to the hot water storage tank;
The control unit
If the temperature of the hot water detected by the temperature detecting means is equal to or higher than a predetermined temperature, the mixing valve is controlled so that hot water taken out from the upper part of the hot water storage tank via the upper take-off path is cut off from the hot water supply path, and the connection The adjustment valve is controlled so that hot water is taken out from the intermediate part intake path to the boiling outlet path via a path, and the hot water that has passed through the heat pump unit is returned to the intermediate part of the hot water storage tank. Control the switching valve to switch to the intake path,
If the temperature of the hot water detected by the temperature detecting means is lower than a predetermined temperature, the adjustment valve is controlled so that hot water is taken out from the intermediate part intake path to the boiling extraction path via the connection path. The hot water supply apparatus according to claim 1, wherein the switching valve is controlled to switch to a boiling intake path for returning hot water that has passed through the heat pump unit to an upper portion of the hot water storage tank.

Images