JP5028183B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus using a heat pump unit for boiling.

  2. Description of the Related Art Conventionally, some hot water supply apparatuses include a boiling circuit that uses a heat pump to boil hot water stored in a hot water storage tank.

  In this boiling circuit, a heating circulation path is connected between the hot water storage tank and the heat pump unit, and a heating heat exchanger for the heating pump unit and a heating circulation pump are arranged in the heating circulation path. ing. Then, by operating the heat pump unit and operating the boiling circulation pump, water is taken out from the lower part of the hot water storage tank and 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. .

  The hot water stored in the hot water storage tank is used not only for hot water supply but also for heat exchange with the heat load side such as reheating of bath water or hot water heating. In this case, a heat load circuit is connected to the hot water storage tank, and in this heat load circuit, a heat load circuit is connected between the upper and lower parts of the hot water tank, and the heat load circuit is connected to the heat load circuit. A heat exchanger and a circulation pump for heat load are arranged. Then, by operating the heat load circulation pump, the hot water is taken out from the upper part of the hot water storage tank, and heat is exchanged with the heat load side in the heat load heat exchanger, and the hot water that has passed through the heat load heat exchanger is stored in the hot water storage tank. Return to the bottom.

  In general, the heat load circuit and the boiling circuit are provided independently for the hot water storage tank.

  Further, after such a hot water supply apparatus is installed, water is supplied into the hot water storage tank through the water supply path, and the air from the boiling circuit and the heat load circuit is removed. In general, in the case of a heat load circuit arranged close to a hot water storage tank, the air in the heat load circuit is likely to escape automatically by supplying water to the hot water storage tank, but the boiling circuit is composed of a hot water storage tank and a heat pump unit. There are many cases where the piping for the heating circuit between the two is long, and there are also cases where it is a so-called ceiling rolling piping or torii piping, and it is difficult for the air in the heating circuit to escape automatically only by supplying water to the hot water storage tank. . Therefore, it has been necessary to dispose an air vent valve in the heating circuit in advance and operate the air vent valve to release air.

Therefore, in order to automate the venting of the boiling circuit, the downstream side of the heat load circuit and the upstream side of the heating circuit are connected to the switching valve and connected to the lower part of the hot water storage tank via this switching valve. In addition, there is a switch between the heating circuit and the heat load circuit by this switching valve, and switching so that the heating circuit and the heat load circuit are connected when the air is released. At the time of air bleed, after supplying water into the hot water storage tank, connect the boiling circuit and the heat load circuit with the switching valve, and operate the heat load circulation pump and the boiling circulation pump from the upper part of the hot water storage tank. The water taken out to the heat load circuit is sent to the boiling circuit through the switching valve, sent to the downstream side of the heating circuit and returned to the upper part of the hot water tank, and the boiling circuit is automatically turned on. Air bleeding is performed (for example, refer to Patent Document 1).
JP 2006-118753 A (page 7-8, FIG. 3)

  However, in a conventional hot water supply device, hot water whose temperature has decreased due to heat exchange is returned to the lower part of the hot water storage tank in the heat load circuit, but the amount of heat of the returned hot water is used to increase the temperature of the water in the lower part of the hot water storage tank. It is not used for hot water supply and is wasted. In addition, since the temperature of the water in the lower part of the hot water storage tank is made higher than the water supply temperature, the temperature of the water to be boiled becomes high when the water is boiled by the heat pump unit, so that the boiling efficiency (COP) is lowered. End up.

  In the boiling circuit, the water boiled by the heat pump unit is returned to the upper part of the hot water storage tank, but it is returned to the upper part of the hot water storage tank immediately after the start of boiling or even if the hot water temperature does not rise sufficiently depending on conditions. Therefore, the temperature of the hot water stored in the upper part of the hot water storage tank is lowered.

  For this reason, it is only necessary that the hot water heat-exchanged in the heat load circuit and the hot water boiled in the boiling circuit can be appropriately returned to a plurality of different height positions including the upper and lower parts of the hot water storage tank. However, there has never been such a configuration. Further, even in such a configuration, it is desirable that air can be automatically released from the boiling circuit without using a dedicated air release valve or the like.

  The present invention has been made in view of the above points, and can return the hot water heat-exchanged in the heat load circuit and the hot water boiled in the boiling circuit to the appropriate height positions of the hot water storage tanks, respectively. An object of the present invention is to provide a hot water supply apparatus that can automatically release air from a boiling circuit without using a dedicated air vent valve or the like in a configuration capable of that.

  The hot water supply device according to claim 1, wherein the hot water storage tank stores hot water with respect to a plurality of different height positions including a hot water storage tank, an extraction path for taking out hot water in the hot water storage tank, and at least an upper portion and a lower portion of the hot water storage tank. A plurality of intake paths that can respectively return hot water taken out from the tank, a heat load circulation path connected to the extraction path and the intake path, and a heat load disposed in the heat load circulation path More than a heat load circuit having a heat load circuit, a heat load circuit having a heat load circulation pump for circulating hot water in the heat load circulation path, and a heat load circulation pump below the hot water storage tank and the heat load circulation path A heating circulation path connected to the intake path through a junction that merges downstream, a heating heat exchanger of a heat pump unit disposed in the heating circulation path, and the hot water storage tank A boiling circuit having a circulating pump for heating that circulates water in the heating section into the circulating circuit for heating, and the plurality of intake paths and the downstream side of the merging section are respectively connected to the merging section side. Switching means for switching the connection to any one of a plurality of intake paths and opening and closing the merging portion side, and venting of the boiling circuit in a state where water is poured into the hot water storage tank And a controller for driving the heat load circulation pump by closing the merging portion side with the switching means during the control.

  The hot water supply apparatus according to claim 2 is the hot water supply apparatus according to claim 1, wherein the take-out path allows hot water to be taken out from different height positions of the upper part and the intermediate part of the hot water storage tank, and from the upper part and the intermediate part. It has a take-out ratio adjusting means for adjusting the take-out ratio, and the control unit adjusts the take-out ratio adjusting means to take out only from the take-out path of the intermediate part in the air bleeding control of the boiling circuit.

  According to the hot water supply device of claim 1, among the plurality of intake paths capable of returning the hot water taken out from the hot water storage tank to a plurality of different height positions including at least the upper part and the lower part of the hot water storage tank, respectively. With the configuration in which one of these is switched by the switching means, the hot water heated in the heat load circuit and the hot water boiled in the boiling circuit can be returned to the appropriate height position of the hot water storage tank, respectively, The intake circuit and the switching means can be shared with the raising circuit. Further, in the configuration, when the air extraction control of the heating circuit is performed, the switching means is used to connect the heating load circuit to the heating circuit. By switching and driving the heat load circulation pump, the water taken out from the hot water storage tank to the heat load circuit is sent to the boiling circuit. The air vent of the lower circuit can automatically.

  According to the hot water supply device of claim 2, in addition to the effect of the hot water supply device of claim 1, the take-out path allows hot water to be taken out from different height positions of the upper part and the middle part of the hot water storage tank. It has a take-out ratio adjusting means that adjusts the take-out ratio from the upper part and the intermediate part, and at the time of air bleeding control of the boiling circuit, by adjusting the take-out ratio adjusting means to take out only from the take-out path of the intermediate part, Air that is pushed out from the boiling circuit and enters the hot water storage tank is not drawn into the heat load circuit, and stable air bleeding can be performed.

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

  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 pursuing bathtub water stretched on the bathtub 14.

  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 tank 17, and an intermediate part take-out path 26 is located between the thermistor 18b at the 1/5 position and the thermistor 18c at the 2/5 position, which is the intermediate position in the vertical direction of the hot water tank 17. It is connected. A check valve 27 that allows hot water to flow only in the direction of removing hot water from the intermediate portion of the hot water storage tank 17 is disposed in the intermediate portion extraction path 26. The upper take-out path 25 and the intermediate take-out path 26 are connected to a regulating valve 28 that is an electric valve as a take-out ratio adjusting means, and the regulating valve 28 allows 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 to The hot water storage tank 17 to be taken out from the intermediate part take-out path 26 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 an extraction temperature detection sensor 30 as an extraction temperature detection means for detecting the temperature of the hot water. The upper extraction path 25, the intermediate section extraction path 26, 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.

  Further, the hot water supply path 29 (extraction path 31) 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 29 (extraction path 31) 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 29 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 back flow to the hot water supply path 29 side and the water supply path 20 side, respectively.

  The hot water mixing valve 34 supplies hot water having a hot water supply 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, 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 the main remote controller installed in the kitchen or the bathroom or the bathroom remote controller installed in the bathroom, for example, or at the time of reheating operation by the bathroom remote controller It also functions as a circulating flow rate adjusting means for supplying hot water at a temperature corresponding to the water replenishment capability and adjusting the circulating flow rate of the hot water. This bathtub mixing valve 35 is connected to a bathtub hot water supply passage 41 for supplying hot water to the bathtub 14, and the bathtub hot water supply passage 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 29 (extraction path 31), 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 for returning the hot water that has passed through the heat exchanger for remedy 44 to the hot water storage tank 17 is connected via a heat exchanger for remedy 44 as a heat load heat exchanger for heat exchange. The return path 45 is for heat load that circulates hot water so that hot water is taken out from the hot water storage tank 17 through the extraction path 31 and returned to the hot water storage tank 17 through the return path 45 after returning to the hot water storage tank 17 through the return path 45. A recirculation circulation pump 46 as a circulation pump is provided, and an intake temperature detection sensor 51 for detecting the temperature of hot water that has passed through the recuperation heat exchanger 44 is provided.

  A switching valve 47 as switching means is connected to the return path 45. The switching valve 47 is an upper intake path 48 connected to the upper part of the hot water storage tank 17, and an intermediate position in the vertical direction of the hot water storage tank 17. The intermediate intake path 49 connected between the thermistor 18d at the / 5 position and the thermistor 18e at the 4/5 position, and the lower intake path 50 connected to the lower part of the hot water tank 17 through the water supply path 20 are connected. Yes. The switching valve 47 switches the return path 45 so that one of the upper intake path 48, the intermediate part intake path 49, and the lower intake path 50 is connected to the return path 45. The road can be opened and closed. In order to enable opening and closing of the flow path on the return path 45 side, the switching valve 47 can be closed by using a ball bearing, for example, and positioning the ball at a position other than the normal use position. Then, the return path 45, the upper intake path 48, the intermediate intake path 49, and the lower intake path 50 pass through the heat exchanger 44 for remedy at a plurality of positions in the upper, intermediate and lower portions of the hot water tank 17. A plurality of intake paths 52 for returning the hot water is formed.

  The extraction path 31 and the plurality of intake paths 52 form a recirculation circuit 53a as a heat load circuit, and the recirculation circuit 53a, the recuperation heat exchanger 44, and the switching valve 47 are connected to each other. A memorial circuit 53 is formed 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 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 excessive pressure during boiling is connected to the upper extraction path 25 of the hot water storage tank 17, and the relief valve 65 is connected to a drainage path 66. The lower part of the hot water storage tank 17 and the drainage path 66 are connected via a drain valve 67 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 circuit 70 having a boiling circulation path 70a. The heating circuit 70a of the heating circuit 70 connects the lower part of the hot water tank 17 and the inlet side of the outdoor unit 13, and connects the outlet side 71 of the outdoor unit 13 and the hot water tank 17. A boiling intake path 72 is provided. This boiling intake path 72 is connected at a junction 73 in the middle of the return path 45 of the memorial circuit 53. The switching valve 47, the upper intake path 48, the intermediate intake path 49, and the lower intake path 50 are connected. Is shared. Then, the connection to the outlet side of the outdoor unit 13 is switched by the switching valve 47 to any one of the upper intake path 48, the intermediate part intake path 49, and the lower intake path 50.

  The outdoor unit 13 is provided with a heat pump unit 75 that boils hot water. The heat pump unit 75 has a refrigerant circuit including a boiling heat exchanger 76 functioning as a compressor and a condenser, an expansion valve, an evaporator, and the like. A heating circuit 70 is connected to the heating heat exchanger 76 of the heat pump unit 75. On the upstream side of the heating heat exchanger 76 of the heat pump unit 75, the heating circulation pump 77 for circulating the water below the hot water storage tank 17 from the boiling extraction path 71 side to the boiling intake path 72 side. Is arranged.

  The hot water supply device 11 includes a control unit 81 that controls the hot water supply device 11. The control unit 81 has the following functions.

  During the memorial operation, the temperature of the hot water in the hot water storage tank 17 near the upper, middle, and lower positions of the hot water storage tank 17 to which the intake path 52 is connected based on the detection of the thermistors 18a to 18f Switching valve to switch to intake path 52 that determines whether the temperature is higher than the temperature that can be used for hot water, and returns hot water that has passed through the heat exchanger 44 for reheating to the position of the hot water storage tank 17 that is determined to be higher than the temperature that can be used for hot water supply Function to control 47. More specifically, if the temperature of the hot water near the lower position of the hot water tank 17 is higher than the temperature that can be used for hot water supply, the lower intake that returns the hot water that has passed through the heat exchanger 44 for reheating to the lower part of the hot water tank 17 The switching valve 47 is controlled so as to switch to the path 50, and the temperature of the hot water near the lower position of the hot water tank 17 is lower than the temperature usable for hot water supply and the hot water near the intermediate position of the hot water tank 17 If the temperature is higher than the temperature that can be used for hot water supply, the switching valve 47 is controlled so as to switch to the intermediate portion intake path 49 for returning the hot water that has passed through the heat exchanger 44 to the intermediate portion of the hot water storage tank 17, If the temperature of the hot water near the intermediate position of the hot water storage tank 17 is lower than the temperature that can be used for hot water supply, switch to the upper intake path 48 that returns the hot water that has passed through the heat exchanger 44 for hot water to the upper part of the hot water storage tank 17. Function to control the switching valve 47.

  A function of switching the switching valve 47 based on detection of a hot water temperature detection sensor (not shown) that detects the hot water temperature from the heat pump unit 75 during the boiling operation.

  A function of driving the circulatory circulation pump 46 by closing the merging portion 73 side with the switching valve 47 during the air bleeding control of the boiling circuit 70 in a state where water is poured into the hot water storage tank 17.

  A function of adjusting the take-out from only the intermediate part take-out path 26 by the adjusting valve 28 when the air release control of the boiling circuit 70 is performed.

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

  First, water supply and air bleeding after the hot water supply device 11 is installed will be described.

  The relief valve 65 and the valves 28, 34, 35, 47 are opened, and water is supplied into the hot water storage tank 17 through the water supply path 20. As a result, water is supplied into the hot water storage tank 17 and also supplied to each pipe connected to the hot water storage tank 17, and the air that escapes from the hot water storage tank 17 and the pipe is discharged from the relief valve 65. In particular, since the remedy circuit 53 is disposed close to the hot water storage tank 17, the remedy circuit 53 is easily supplied with water into the remedy circuit 53 by supplying water to the hot water storage tank 17, and the air in the remedy circuit 53 is Is easy to come off automatically. On the other hand, in the boiling circuit 70, the piping of the heating circulation path 70a between the hot water storage tank 17 and the heat pump unit 75 is often long, and there are also cases where it becomes so-called ceiling rolling piping or torii piping, The water supply to the hot water storage tank 17 alone is not sufficient to supply water to the boiling circuit 70, and the air in the boiling circuit 70 is difficult to automatically escape.

  If the hot water storage tank 17 is full and water overflows from the relief valve 65, the water supply is stopped, the relief valve 65 is returned to the functioning state, and the water supply is completed.

  In the state where water is supplied to the hot water storage tank 17, the air bleeding control of the boiling circuit 70 is performed. In the air venting control of the boiling circuit 70, as shown by the black display of the piping path in FIG. 1 and the arrow, the regulator valve 28 is adjusted to take out water only from the intermediate section outlet path 26, and the switching valve 47 Then, the merging portion 73 side is closed to switch to the connection from the chasing circuit 53 to the boiling circuit 70, and the chasing circulation pump 46 is driven. As a result, the water in the hot water storage tank 17 is extracted from the intermediate section 26, the regulating valve 28, the hot water supply path 29 (takeout path 31), the mixing valve 35, the heat exchanger 44 for remedy, the circulation pump 46 for remedy, the return path 45, a path for returning to the lower part of the hot water storage tank 17 through the boiling circuit 70a of the junction 73 and the boiling circuit 70, that is, a path for forcibly sending water from the remedy circuit 53 to the boiling circuit 70 Configure.

  Therefore, the water in the piping for the heating circuit 70a, the heat exchanger 76 for heating of the heat pump unit 75, and the circulating pump 77 for heating flows into the hot water tank 17, and the air present in these flows into the hot water storage tank 17. The air is vented.

  At this time, since the adjustment valve 28 is adjusted to take out water only from the intermediate part extraction path 26, the air pushed out from the boiling circuit 70 and entering the hot water storage tank 17 is drawn into the memory circuit 53. And stable air bleeding.

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

  The heat pump unit 75 and the heating circulation pump 77 of the outdoor unit 13 are operated as a specific heating time zone, for example, in the night time zone of the hourly lighting system. As shown by the black display of the piping path in FIG. 2 and the arrow, by the operation of the circulating pump 77 for boiling, the water below the hot water storage tank 17 is taken out from the boiling extracting path 71 and sent to the heat pump unit 75. Hot water boiled by the heat pump unit 75 is returned to the hot water storage tank 17 through the boiling intake path 72.

  When the temperature of the hot water discharged from the heat pump unit 75 of the outdoor unit 13 is low, the switching valve 47 switches to the lower intake path 50 or the intermediate intake path 49, and the hot water having a low temperature is returned to the lower or intermediate area of the hot water storage tank 17. Prevents the temperature drop of hot water at the top of the hot water storage tank 17. In addition, when the temperature of the hot water boiled by the heat pump unit 75 of the outdoor unit 13 is equal to or higher than the target boiling temperature, the switching valve 47 switches to the upper intake path 48 and the upper temperature of the hot water storage tank 17 is higher than the target boiling temperature. Send hot water 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 on the downstream side of the hot water supply path 38, the hot water in the hot water storage tank 17 is pushed out by the supply water pressure, and through the upper outlet path 25, the intermediate part outlet path 26, the regulating valve 28 and the hot water path 29. 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 hot water mixing valve 34 to obtain hot water having a predetermined hot water supply 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 29 is adjusted by adjusting the mixing ratio between 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 take-out passage 26 by the adjusting valve 28. Take out.

  Next, use of the bathtub 14 will be described.

  When filling the bathtub 14 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 solenoid valve of the hopper 42, and the upper outlet path 25, the intermediate outlet path 26, the regulating valve 28 and the hot water path The hot water taken out from the hot water storage tank 17 through the water 29 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 the bathtub circulation path 54 constituting a 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. In addition, the hot water taken out to the hot water supply passage 29 is adjusted by the adjustment valve 28 to adjust 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 portion take-out passage 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.

  In addition, when the temperature of the bathtub water falls below the set temperature, it automatically retreats, and it can also be remediated by manual operation such as a bathtub remote controller.

  In the reheating operation, as indicated by the black display of the piping path in FIG. 3 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 that state, the hot water in the hot water storage tank 17 is taken out through the upper take-out path 25, the intermediate part take-out path 26, the regulating valve 28, and the hot water supply path 29 (take-out path 31) by operating the circulation pump 46 for memory. It is sent to the heat exchanger for remedy 44, 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 for remedy 44. The hot water temperature in the bathtub 14 is raised. Note that the hot water taken out to the hot water supply path 29 (take-out path 31) is adjusted with the hot water in the upper part of the hot water storage tank 17 taken out from the upper take-out path 25 and the hot water in the middle part of the hot water storage tank 17 taken out from the intermediate part take-out path 26. Adjust and adjust the mixing ratio.

  Further, the hot water from the hot water storage tank 17 whose temperature has dropped after passing through the heat exchanger for remnant 44 is a return path 45, a switching valve 47, an upper intake path 48, an intermediate intake path 49, and a lower intake path 50. It returns to the hot water storage tank 17 through any one of these.

  At this time, based on the detection of the thermistors 18a to 18f of the hot water storage tank 17, the upper, intermediate and lower portions of the hot water storage tank 17 to which the upper intake path 48, the intermediate intake path 49 and the lower intake path 50 are connected are connected. It is determined whether the temperature of the hot water in the hot water storage tank 17 near each position is higher than the temperature that can be used for hot water supply. The switching valve 47 is switched so as to return the hot water that has passed.

  As described above, when the hot water whose temperature has decreased after passing through the heat exchanger 44 for return is returned to the hot water storage tank 17, the upper, middle and lower parts of the hot water storage tank 17 to which the intake paths 48, 49, 50 are connected. It is determined whether the temperature of the hot water in the hot water storage tank 17 in the vicinity of each position is higher than the temperature that can be used for hot water supply. In order to switch the hot water that has passed through one of the intake paths 48, 49, 50 so as to return the hot water, the amount of heat of the hot water that has passed through the heat exchanger 44 for reheating is used as hot water for the hot water storage tank 17. Return to the area of hot water that can be used, no longer return to the area of water below the hot water storage tank 17 that can not be used for hot water supply, it can be used effectively for hot water supply without wasting the amount of hot water, much hot water that can be used for hot water supply it can.

  According to the hot water supply device 11 configured as described above, the intake path capable of returning the hot water taken out from the hot water storage tank 17 to different height positions of the upper, middle and lower portions of the hot water storage tank 17 respectively. By switching between one of 48, 49, and 50 with the selector valve 47, the hot water exchanged by the memory circuit 53 and the hot water boiled by the boiling circuit 70 are respectively placed at appropriate height positions in the hot water storage tank 17. The intake path 31 and the switching valve 47 can be shared by the remedy circuit 53 and the boiling circuit 70. Further, in the configuration, when the air venting control of the boiling circuit 70 is performed, the switching valve 47 is used to switch the connection from the remedy circuit 53 to the boiling circuit 70 to drive the remedy circulation pump 46. As a result, the water taken out from the hot water storage tank 17 to the memorial circuit 53 is sent to the boiling circuit 70, so that the air of the boiling circuit 70 can be automatically vented without using a dedicated air vent valve.

  If the upper extraction path 25 is not at the uppermost part of the hot water storage tank 17, not only the intermediate extraction path 26 but also the upper extraction path 25 and the intermediate extraction path 26 when the air extraction control of the boiling circuit 70 is performed. As a result, the air in the pipes of the upper take-out path 25 and the intermediate take-out path 26 can be surely removed.

  In addition, if a self-priming pump is used for the boiling circulation pump 77, the boiling circulation pump 77 is also driven to control the water in the hot water storage tank 17 during the air bleeding control of the boiling circuit 70. By pulling from 53 to the boiling circuit 70, more reliable and stable air bleeding can be performed.

  In addition, although the intake path 52 is connected to each of the intake paths 48, 49, 50 one by one in the upper part, the intermediate part and the lower part of the hot water tank 17, the intermediate part intake path connected to the intermediate part of the hot water tank 17. The number 49 may be plural, and may be connected to a plurality of different positions in the vertical direction of the intermediate portion of the hot water storage tank 17.

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

It is a block diagram which shows the air bleeding control of the hot-water supply apparatus which shows one embodiment of this invention. It is a block diagram which shows the boiling operation of a hot-water supply apparatus same as the above. It is a block diagram which shows the chasing operation of the hot water supply apparatus same as the above.

Explanation of symbols

11 Water heater
17 Hot water storage tank
28 Adjustment valve as a means to adjust the extraction ratio
31 Extraction route
44 Heat exchanger for remembrance as heat exchanger for heat load
46 Recirculation circulation pump as circulation pump for heat load
47 Switching valve as switching means
52 Intake route
53 Remembrance circuit as thermal load circuit
53a Remembrance circuit as heat load circuit
70 Heating circuit
70a Boiling circuit
73 Junction
75 Heat pump unit
76 Heat exchanger for boiling
77 Boiling circulation pump
81 Control unit

Claims (2)

A hot water storage tank for storing hot water,
An extraction path for taking out hot water in the hot water storage tank;
A plurality of intake paths capable of returning the hot water taken out from the hot water storage tank to a plurality of different height positions including at least an upper part and a lower part of the hot water storage tank;
A heat load circulation path connected to the extraction path and the intake path, a heat load heat exchanger disposed in the heat load circulation path, and a heat load for circulating hot water in the heat load circulation path A heat load circuit having a circulation pump for use;
A heating circulation path connected to the intake path via a junction that joins the lower part of the hot water storage tank and the thermal load circulation pump downstream of the heat load circulation path, and the heating circulation path A heating circuit having a heating pump for heating of the heat pump unit disposed in the heating circuit, and a heating circulation pump for circulating the water in the lower part of the hot water storage tank into the heating circuit for heating;
The plurality of intake paths and the downstream side of the merging section are respectively connected, and the connection to the merging section side is switched to any one of the plurality of intake paths, and the merging section side can be opened and closed. Switching means for
A control unit that drives the heat load circulation pump by closing the merging unit side with the switching means when performing air bleeding control of the boiling circuit in a state where water is poured into the hot water storage tank. A hot water supply device characterized by that. The take-out path is capable of taking out hot water from different height positions of the upper and middle parts of the hot water storage tank, and has take-out ratio adjusting means for adjusting the take-out ratio from these upper and middle parts,
2. The hot water supply apparatus according to claim 1, wherein the control unit causes the extraction ratio adjusting means to adjust the extraction from only the extraction path of the intermediate portion when performing air bleeding control of the boiling circuit.

Images