JP5763496B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus that reduces an increase in pressure when pouring hot water into a bathtub is stopped.

  In a conventional hot water storage type hot water supply apparatus of this type, as shown in FIG. 4, a hot water storage tank 101 for storing hot water, heating means 102 for heating the hot water in the hot water storage tank 101, and a pressure reducing valve at the lower part of the hot water storage tank 101. A hot water supply pipe 104 connected to the hot water storage tank 101 connected to the hot water storage tank 101, a hot water supply pipe 105 connected to the upper part of the hot water storage tank 101, a water supply bypass pipe 106 branched from the water supply pipe 104, and hot water and water supply from the hot water supply pipe 105. A mixing valve 107 that mixes water from the bypass pipe 106 to obtain hot water at a set temperature, and a hot water supply pipe that supplies hot water at a set temperature mixed by the mixing valve 107 to a hot water tap 108 provided in a kitchen or a washroom. 109, a tub 110, a bath heat exchanger 111 that exchanges heat between the bathtub water in the bathtub 110 and hot water in the hot water storage tank 101, and the bathtub 110 and the bath heat exchanger 111 are connected to each other. Bypass the bath circulation circuit 114 composed of the return pipe 112 and the bath return pipe 113, the bath circulation pump 115 provided in the bath return pipe 113 and circulating the bath water of the bathtub 110 to the bath circulation circuit 114, and the bath heat exchanger 111. Then, a bath bypass pipe 116 connecting the bath return pipe 112 and the bath return pipe 113, and a connecting portion between the bath bypass pipe 116 and the bath return pipe 113 are provided, and the bath 110 is poured only from the bath return pipe 113. A bath three-way valve 117 that can be switched between a single conveying state and a both conveying state in which the bath 110 is poured from both the bath outlet pipe 112 and the bath return pipe 113, and hot water in the hot water storage tank 101 connected to the bath return pipe 113. A hot water filling pipe 118 for pouring water into the bathtub 110 and a hot water solenoid valve 119 for opening and closing the hot water filling pipe 118. When the hot water filling solenoid valve 119 is opened, the hot water filling to the bathtub 110 is started, and the hot water is poured into the bathtub 110 with the bath three-way valve 117 being in both transport states. When the amount reaches, the bath three-way valve 117 is placed in a single conveying state to pour hot water into the bathtub 110 only from the bath return pipe 113, and when the hot water is poured into the bathtub 110 to the set amount, the hot water solenoid valve 119 is closed to supply hot water to the bathtub 110. There was something that finished the tension. (For example, refer to Patent Document 1.)

JP 2008-128528 A

  By the way, in recent years, there has been an increase in the pressure setting of the pressure reducing valve 103 higher than before due to the need to supply hot water at a sufficient flow rate even at high places on the second and third floors of a house. In the hot water storage type hot water supply apparatus in which the set pressure of the pressure reducing valve 103 is set high, when the hot water filling to the bathtub 110 is performed as described above, the bath three-way valve 117 is When the hot water solenoid valve 119 is closed in this state, the pressure applied to the bath return pipe 113 is suddenly increased by water hammer, and the bath circulation provided in the bath return pipe 113 is instantaneously increased. There was a risk that functional parts such as the pump 115 would be damaged, or the water constituting the bath circulation circuit 114 may be disconnected or leaked due to damage.

  Therefore, the present invention reduces the pressure caused by water hammer applied to functional parts such as the bath circulation circuit 114 and the bath circulation pump 115 on the side provided with the bath circulation pump 115 when stopping the pouring of water into the bathtub 110, It is an object of the present invention to provide a hot water storage type hot water supply apparatus capable of preventing breakage of functional parts such as the circulation pump 115, leakage of piping constituting the bath circulation circuit 114, and water leakage due to damage.

Therefore, in order to solve the above-mentioned problems, the present invention particularly has a configuration according to claim 1 in which a hot water storage tank for storing hot water and a bath heat for heating the bathtub water in the bathtub by exchanging heat with the hot water in the hot water storage tank. A bath circulation circuit composed of an exchanger, a bath outlet pipe and a bath return pipe connecting the bathtub and the bath heat exchanger, a bath circulation pump provided in the bath circulation circuit and circulating bath water, and the bath circulation A hot water pipe connected to a circuit for pouring hot water in the hot water storage tank into the bathtub, an on-off valve for opening and closing the hot water pipe, and a side provided with the bath circulation pump provided in the bath circulation circuit Switchable between a single conveying state in which hot water can be poured into the bathtub only from the bath circulation circuit and a double conveying state in which hot water can be poured into the bathtub from both the bath outlet pipe and the bath return pipe. Channel cut In a hot water storage type hot water supply apparatus that pours water into the bathtub through the bath circulation circuit from the hot water filled pipe, when closing at least the on-off valve and stopping pouring into the bathtub, When the flow path switching means is set to the both conveying state , the opening / closing valve is opened and pouring of the hot water into the bathtub is started, the flow path switching means is set to the both conveying state and a set amount is poured into the bathtub. When hot water is poured, the flow path switching means is set to both transport states until the first specified amount that is set in advance by a predetermined amount less than the set amount is reached, and when the first specified amount is reached. The flow path switching means is switched from the both conveyance state to the one-side conveyance state until the second predetermined amount set in advance is smaller than the set amount by a predetermined amount and larger by the predetermined amount than the first predetermined amount. The flow path switching means is set to a single conveying state, and the second regulation Upon reaching, switching the both conveyance state the flow path switching means from the piece transfer state, upon reaching the set amount, and shall be closed the opening and closing valve.

Further, in claim 2, a hot water storage tank for storing hot water, a bath heat exchanger that heats the bathtub water in the bathtub by exchanging heat with the hot water in the hot water storage tank, and the bathtub and the bath heat exchanger are connected. A bath circulation circuit comprising a bath return pipe and a bath return pipe, a bath circulation pump provided in the bath circulation circuit for circulating bath water, and hot water in the hot water storage tank connected to the bath circulation circuit is poured into the bathtub. Hot water can be poured into the bathtub only from the hot water filling tube, the on-off valve that opens and closes the hot water filling tube, and the bath circulation circuit that is provided in the bath circulation circuit and provided with the bath circulation pump. And a flow path switching means switchable between a single conveying state and both conveying states capable of pouring into the bathtub from both the bath outlet pipe and the bath return pipe, and from the hot water filled pipe to the bath Through the circulation circuit In the hot water storage type hot water supply apparatus for pouring hot water into the bathtub, and having the step of pouring hot water into the bathtub with the flow path switching means in a single conveying state, when stopping pouring of water into the bathtub The opening / closing valve is closed after the flow path switching means is in the both conveying state .

According to a third aspect of the present invention, when the pouring of the hot water into the bathtub is started, the opening / closing valve is opened after the flow path switching means is in the both conveying state .

According to the first aspect of the present invention, at least when the on-off valve is closed and the pouring of the hot water into the bathtub is stopped, the flow path switching means is brought into the double-conveyance state, so that it occurs at the moment when the on-off valve is closed. Pressure rise due to water hammer can be distributed and reduced in both the bath return pipe and the bath return pipe, preventing damage to functional parts such as the bath circulation pump and water leakage due to disconnection or damage of the pipes that make up the bath circulation circuit Furthermore, when opening the on-off valve and starting pouring water into the bathtub, the pressure due to water hammer generated at the moment when the on-off valve is opened by setting the flow path switching means to both conveying states. The rise can be distributed and reduced in both the bath return pipe and the bath return pipe, preventing damage to functional parts such as the bath circulation pump and water leakage due to disconnection or damage of the pipes that make up the bath circulation circuit. In addition, note the set amount to the bathtub When the hot water is poured, the flow path switching means is set in both transport states until the first predetermined amount which is a predetermined amount less than the set amount is reached, and the bathtub is drawn from both the bath outlet pipe and the bath return pipe. By pouring hot water into the bath, it is possible to disperse and reduce the pressure increase due to water hammer generated at the moment when the on-off valve at the start of pouring is opened, to both the bath outlet pipe and the bath return pipe. It is possible to prevent water leakage due to breakage of functional parts and disconnection or damage of the pipes constituting the bath circulation circuit, and to shorten the pouring time. The state is switched from the state to the single conveyance state, and the flow path switching means is set to the single conveyance state until only the bath return pipe is reached until a preset second predetermined amount that is a predetermined amount smaller than the set amount and larger than the first predetermined amount is reached. Pour into the bathtub Then, the air remaining in the vicinity of the bath circulation pump etc. is pushed out and the air of the bath return pipe is surely removed, and when the second specified amount is reached, the flow path switching means is switched from the single conveying state to the double conveying state. When the set amount is reached, the on-off valve is closed while the flow path switching means is in both conveying states, so that the pressure increase due to water hammer generated at the moment when the on-off valve is closed is reduced to the bath outlet pipe and the bath return pipe. It is possible to prevent the leakage of water due to breakage of functional parts such as a bath circulation pump and disconnection or damage of piping constituting the bath circulation circuit.

According to the second aspect of the present invention, in the step of pouring water into the bathtub with the flow path switching means in the single conveyance state, when stopping pouring into the bathtub, the flow path switching means is in both conveyance states. Since the on / off valve is closed, the pressure increase due to water hammer generated at the moment when the on / off valve is closed can be dispersed and reduced in both the bath outlet pipe and the bath return pipe. It is possible to prevent water leakage due to breakage of functional parts, disconnection of pipes constituting the bath circulation circuit, and damage.

According to the third aspect of the present invention, when pouring water into the bathtub is started, the opening / closing valve is opened after the flow path switching means is set to the both conveying state, so that the opening / closing valve is opened at the moment. It is possible to reduce the pressure rise caused by water hammer by distributing it to both the bath return pipe and the bath return pipe, and damage to functional parts such as the bath circulation pump and water leakage due to disconnection or damage of the piping constituting the bath circulation circuit. It can be prevented.

The schematic block diagram of one Embodiment of the hot water storage type hot water supply apparatus of this invention. Operation | movement explanatory drawing of the bath three-way valve of the same embodiment. The flowchart which shows the hot water filling operation | movement of the same embodiment. The schematic block diagram of the conventional hot water storage type hot-water supply apparatus.

Next, an embodiment of the present invention will be described with reference to FIG.
1 is a hot water storage tank unit having a hot water storage tank 2 for storing hot water, 3 is a hot water tap provided in a kitchen, a washroom, etc., 4 is a remote controller for remotely operating the hot water storage type hot water supply device, and 5 is a bathtub.

  A water supply pipe 6 is connected to the lower part of the hot water storage tank 2 to supply water to the hot water storage tank 2, and 7 is a pressure reducing valve provided in the middle of the water supply pipe 6 to reduce the water supply pressure to a predetermined pressure. The high pressure setting is 260 kPa. A hot water discharge pipe 8 is connected to the upper part of the hot water storage tank 2 and takes out hot water from the upper part of the hot water storage tank 2.

  Reference numeral 9 denotes a first water supply bypass pipe branched from the water supply pipe 6 on the downstream side of the pressure reducing valve 7, and 10 denotes internal hot water from the hot water discharge pipe 8 and water from the first water supply bypass pipe 9 so as to reach a set temperature. A hot water mixing valve that adjusts and mixes the valve opening of a valve body (not shown), 11 is a hot water supply pipe that supplies hot water mixed by the hot water mixing valve 10 to the hot water tap 3, and 12 is a hot water mixing valve 10 A hot water supply temperature sensor 13 detects the temperature of the hot water after mixing, and 13 is a hot water supply flow rate sensor for counting the hot water supply flow rate.

  A bath heat exchanger 14 is arranged at the upper part in the hot water storage tank 2 and is made of a stainless steel tube for heat exchange by heating the bath water of the bath 5 with hot water in the hot water storage tank 2, and 15 is a bath 5 and a bath. A bath circulation circuit 18 comprising a bath outlet pipe 16 and a bath return pipe 17 connected to the heat exchanger 14 is provided in the bath return pipe 17, and the bath water in the bathtub 5 is exchanged with the bath heat via the bath return pipe 17. It is a bath circulation pump that circulates the bathtub water that has been sent to the vessel 14 and passed through the bath heat exchanger 14 so as to be returned to the bathtub 5 through the bath outlet pipe 16.

  Reference numeral 19 denotes a running water switch provided on the bath return pipe 17 for detecting the presence or absence of running water. Reference numeral 20 denotes a bath temperature sensor provided on the bath return pipe 17 for detecting the temperature of the bath water flowing out of the bathtub 5 and flowing into the bath heat exchanger 14. , 21 is a water level sensor provided as a water level detecting means provided near the bathtub 5 of the bath return pipe 17 to detect the water level in the bathtub 5 from the water pressure of the bathtub water.

  22 is a bath bypass pipe that bypasses the bath heat exchanger 14 and connects the bath outlet pipe 16 and the bath return pipe 17, and 23 is provided at the connection between the bath bypass pipe 22 and the bath return pipe 17, and the bath return pipe As a flow path switching means comprising an electric three-way valve capable of switching between a single conveying state in which only the bath 17 is poured into the bathtub 5 and a both conveying state in which the bath 5 is poured from both the bath outlet pipe 16 and the bath return pipe 17. This is a three-way valve.

  The bath three-way valve 23 connects the bath 5 side of the bath return pipe 17 to the inflow side connection port 23a, and one of the two outflow side connection ports 23b and 23c has a bath heat exchanger. 14 is connected to the other connection port 23c, and a bath bypass pipe 22 is connected to the other connection port 23c. The inner valve body is moved by driving an electric motor (not shown), as shown in FIG. In addition, the bath 5 side and the bath bypass tube 22 side of the bath return pipe 17 are connected to each other, and the entrance side of the bath heat exchanger 14 is closed, so that the bath 5 is poured into the bath 5 from both the bath return pipe 16 and the bath return pipe 17. As shown in FIG. 2 (a), both the transport state in which hot water is allowed to flow and the bath 5 side of the bath return pipe 17 and the inlet side of the bath heat exchanger 14 are connected to close the bath bypass pipe 22 side. The bath 5 is poured from both the bath outlet pipe 16 and the bath return pipe 17. 2 at least, and as shown in FIG. 2 (c), at least the bath return pipe 17 is closed in the bathtub 5 side and the bath return pipe 17 alone can be poured into the bathtub 5 at least. It can be switched.

  Reference numeral 24 denotes a bath outlet pipe branched from the outlet pipe 8; 25, a second feed water bypass pipe branched from the first feed water bypass pipe 9; 26, hot water from the bath exit pipe 24 and water from the second feed water bypass pipe 25; Is a bath mixing valve 27 that adjusts the valve opening of an internal valve body (not shown) so as to be set at a set temperature, and 27 is closer to the bath heat exchanger 14 than the position where the bath circulation pump 18 is disposed. A hot water pipe connected to the bath return pipe 17 on the side of the bathtub 5 with respect to the position where the bath three-way valve 23 is disposed, and for pouring hot water in the hot water storage tank 2 into the bathtub 5, and 28 opens and closes the hot water pipe 27. A hot water solenoid valve as an on-off valve for starting and stopping pouring of the bath 5, 29 is a bath flow sensor that counts the amount of pouring water into the bath 5, and 30 prevents the bath water of the bath 5 from flowing backward. Double check valves.

  31 is an electric heater as a heating means for heating the hot water in the hot water storage tank 2. Here, an electric heater is applied as an example of the heating means, but the heating means may be a heat pump type heating means or a combustion burner using kerosene or gas as fuel.

  Reference numeral 32 denotes a hot water supply temperature sensor 12, a hot water supply flow sensor 13, a flowing water switch 19, a bath temperature sensor 20, a water level sensor 21, and a bath flow sensor 29 in the hot water storage tank unit 1. The control means 32 controls the drive of the bath three-way valve 23, the bath mixing valve 26, and the hot water solenoid valve 28. The control means 32 is connected to the remote controller 4 so as to be communicable wirelessly or by wire.

  The remote controller 4 includes a hot water supply temperature setting switch 33 for setting the hot water supply set temperature, a bath temperature setting switch 34 for setting the bath set temperature, and a hot water amount setting switch (see FIG. A hot water filling switch 35 for instructing a hot water filling operation for pouring a hot water filling set amount set in (not shown) is provided.

  Next, the operation of the hot water storage type hot water supply apparatus shown in FIG. 1 during the hot water filling operation will be described with reference to the flowchart shown in FIG.

  When the hot water filling switch 35 of the remote controller 4 is operated by the user, first, a priming process for supplying priming water necessary for starting the bath circulation pump 18 is started, and the control means 32 sets the bath three-way valve 23 in FIG. As shown in a), the bath return pipe 17 is connected to the bathtub 5 side and the bath bypass pipe 22 side, the entrance side of the bath heat exchanger 14 is closed, and the bath return pipe 16 and the bath return pipe 17 are both closed. Then, the control means 32 opens the hot water solenoid valve 28 to start pouring (step S2), and immediately after that, the bath 5 can be poured into the bathtub 5 (step S1). The valve body of the three-way valve 23 is rotated by an electric motor to close the bathtub 5 side of the bath return pipe 17 as shown in FIG. 2 (C) from both conveying states as shown in FIG. 2 (A). Pour hot water into the tub 5 only from the bath return pipe 17 It is intended to switch gradually at one conveying ready (step S3). When the hot water solenoid valve 28 is opened, hot water mixed at the bath setting temperature by the bath mixing valve 26 is poured into the bath circulation circuit 15 via the hot water pipe 27.

  Then, the control means 32 determines whether or not a predetermined amount, for example, 3 L, has been poured from the integrated value of the hot water amount detected by the bath flow sensor 29 (step S4), and determines that a predetermined amount has been poured. Then, it is determined that the priming water to the bath circulation pump 18 and the air return from the bath return pipe 17 have been completed, and the bath three-way valve 23 is returned from the one transport state to the both transport state as shown in FIG. 2A (step S5). Then, the hot water solenoid valve 28 is closed (step S6), and the priming process is completed.

  When the priming step is completed, the control means 32 drives the bath circulation pump 18 for a certain period of time, and checks the presence or absence of running water with the running water switch 19 (step S7). Since there is no hot water in the bathtub 5 when there is no running water, the hot water solenoid valve 28 is opened while the bath three-way valve 23 is in both transport states (step S8), and a hot water set amount, for example, 180 L of hot water is poured. To start.

  When the hot water solenoid valve 28 is opened, hot water is poured into the bathtub 5 from both the bath outlet pipe 16 and the bath return pipe 17, and the control means 32 determines from the integrated value of the hot water amount detected by the bath flow rate sensor 29. It is determined whether or not the pre-set first specified amount, for example, 170 L, which is smaller than the hot water set amount is poured (step S9), and if it is determined that the first prescribed amount is poured, the bath three-way valve 23 The valve body is rotated by an electric motor to change from both transport states to a single transport state as shown in FIG. 2C (step S10), and the pouring to the bathtub 5 is switched to the bath return pipe 17 only. .

  Subsequently, the control means 32 starts from the accumulated amount of hot water detected by the bath flow sensor 29 to a preset second specified amount, for example, 178 L, which is a predetermined amount less than the hot water set amount and a predetermined amount greater than the first specified amount. It is determined whether or not the hot water has been poured (step S11), and if it is determined that the hot water has been poured up to the second specified amount, the valve body of the bath three-way valve 23 is rotated by the electric motor, and the state of FIG. (Step S12), pouring hot water into the bathtub 5 from both the bath outlet pipe 16 and the bath return pipe 17, and setting the hot water filling from the integrated value of the amount of hot water detected by the bath flow sensor 29. It is determined whether or not the amount has been poured (step S13). If it is determined that the amount of hot water has been poured, the hot water solenoid valve 28 is closed (step S14), and the hot water operation is terminated. .

  During the hot water filling operation described above, in step S6 or step S14, when the hot water solenoid valve 28 is closed to stop pouring water into the bathtub 5, as the preceding stage, in step S5 or step S12, Even if the set pressure of the pressure reducing valve 7 is set to a high pressure, the bath three-way valve 23 is set to the double transfer state, and the hot water solenoid valve 28 is closed after the bath three-way valve 23 is set to the double transfer state. In addition, pressure fluctuations such as a sudden drop in pressure and a sudden rise in pressure due to water hammer occurring at the moment when the hot water solenoid valve 28 is closed can be dispersed and reduced in both the bath outlet pipe 16 and the bath return pipe 17, and the bath circulation. It is possible to prevent water leakage due to breakage of functional parts such as the pump 18 and the water level sensor 21 and disconnection or damage of piping constituting the bath circulation circuit 15.

  When the hot water solenoid valve 28 is opened in step S2 or step S8 to start pouring hot water into the bathtub 5, the bath three-way valve 23 is turned on in step S1 or step S5. Even if the set pressure of the pressure reducing valve 7 is set to a high pressure, the hot water solenoid valve 28 is set in the transport state and the hot water solenoid valve 28 is opened after the bath three-way valve 23 is in both transport states. The pressure increase due to water hammer generated at the moment when the valve is opened can be distributed and reduced in both the bath outlet pipe 16 and the bath return pipe 17, damage to functional parts such as the bath circulation pump 18 and the water level sensor 21, and bath circulation. Water leakage due to disconnection or damage of the pipes constituting the circuit 15 can be prevented.

  Further, immediately after the hot water solenoid valve 28 is opened in the step S2, the control means 32 rotates the valve body of the bath three-way valve 23 by the electric motor in the step S3, as shown in FIG. By gradually switching from both transport states to the single transport state as shown in FIG. 2 (c), it is possible to prevent sudden pressure from being applied to the bath return pipe 17 equipped with the bath circulation pump 18, Furthermore, by pouring a predetermined amount of water in the single conveyance state, the pressure of the hot water flowing through the bath return pipe 17 can be increased and the flow rate can be increased, so that the bath circulation pump 18 can be priming reliably.

  In addition, when pouring a set amount of water into the bathtub 5, the bath three-way valve 23 is set in both conveying states until the first specified amount that is preset by a predetermined amount less than the set amount is started. By pouring most of the set amount from both the bath outlet pipe 16 and the bath return pipe 17 to the bathtub 5, even when the pressure setting of the pressure reducing valve 7 is a high pressure setting, The pressure increase due to water hammer generated at the moment when the tension solenoid valve 28 is opened can be dispersed and reduced in both the bath outlet pipe 16 and the bath return pipe 17, and functional components such as the bath circulation pump 18 and the water level sensor 21 can be reduced. It is possible to prevent water leakage due to breakage, disconnection of pipes constituting the bath circulation circuit 15 and damage, and also to shorten the pouring time. When the first specified amount is reached, the bath three-way valve 23 is in the state of both transports. Switch from single to The bath three-way valve 23 is placed in a single transport state and poured into the bathtub 5 only from the bath return pipe 17 until reaching a preset second prescribed amount that is a prescribed amount less than the first prescribed amount and a prescribed amount greater than the first prescribed amount. Thus, the air remaining in the vicinity of the bath circulation pump 18 and the water level sensor 21 is pushed out and the air from the bath return pipe 17 is surely removed, so that erroneous detection of the water level by the water level sensor 21 due to air contamination can be prevented. 2 When the specified amount is reached, the bath three-way valve 23 is switched from the single transfer state to the double transfer state, and when the set amount is reached, the hot water solenoid valve 28 is closed while the bath three-way valve 23 remains in the double transfer state. Thus, even if the set pressure of the pressure reducing valve 7 is a high pressure setting, the pressure increase due to water hammer generated at the moment when the hot water solenoid valve 28 is opened is distributed to both the bath outlet pipe 16 and the bath return pipe 17. Reduction So it can be one in which it is possible to prevent damage of functional parts such as a bath circulation pump 18 and the water level sensor 21, the water leakage due to off or damage of the piping constituting the bath circulation circuit 15.

  The present invention is not limited to the above-described embodiment. In the present embodiment, the bath three-way valve 23 is in the both-transport state as shown in FIG. However, the bath three-way valve 23 may be in the both-transport state as shown in FIG. 2 (a), and various modifications are possible without departing from the scope of the present invention, and this is not disturbed. .

  Further, in the present embodiment, the hot water filling operation has been described as an example. However, the present invention is not limited to the hot water filling operation, and the present invention is not limited to the hot water filling operation but performs a pouring operation of a set amount to the bathtub 5 such as tossed water or high temperature hot water. Even in such a case, when the hot water solenoid valve 28 is closed to stop pouring water into the bathtub 5, or when the hot water solenoid valve 28 is opened, pouring into the bathtub 5 is possible. Even when the hot water is started, the hot water filling solenoid valve 28 is closed or opened after the bath three-way valve 23 is in both transport states, so that the hot water filling is performed even if the pressure setting of the pressure reducing valve 7 is set to a high pressure. Pressure rise due to water hammer generated at the moment when the solenoid valve 28 is opened can be dispersed and reduced in both the bath outlet pipe 16 and the bath return pipe 17, and functional parts such as the bath circulation pump 18 and the water level sensor 21 are damaged. , Prevents water leakage due to disconnection or damage of the piping constituting the bath circulation circuit 15 Further, up to a first predetermined amount that is a predetermined amount smaller than the set amount, the bath three-way valve 23 is in both transport states, and most of the set amounts are the bath outlet pipe 16 and the bath return pipe 17. By pouring into the bathtub 5 from both sides, the pouring time can be shortened. When the first specified amount is reached, the bath three-way valve 23 is switched from the both-transport state to the one-transport state, and only from the bath return pipe 17 By pouring water into the bathtub 5, the air remaining in the vicinity of the bath circulation pump 18 and the water level sensor 21 is pushed out and the bath return pipe 17 is surely vented to prevent erroneous detection of the water level by the water level sensor 21 due to air contamination. Is something that can be done.

2 Hot Water Storage Tank 5 Bath 14 Bath Heat Exchanger 15 Bath Circulation Circuit 16 Bath Outward Pipe 17 Bath Return Pipe 18 Bath Circulation Pump 23 Bath Three-way Valve 27 Hot Water Tub 28 Hot Water Solenoid Valve

Claims (3)

A hot water storage tank that stores hot water, a bath heat exchanger that heats the bathtub water in the bathtub by exchanging heat with the hot water in the hot water storage tank, a bath pipe that connects the bathtub and the bath heat exchanger, and a bath return A bath circulation circuit comprising pipes, a bath circulation pump provided in the bath circulation circuit for circulating bath water, a hot water pipe connected to the bath circulation circuit and for pouring hot water in the hot water storage tank into the bathtub, An on-off valve that opens and closes the hot-water pipe, a single-conveyed state in which hot water can be poured into the bathtub only from the bath circulation circuit provided in the bath circulation circuit and provided with the bath circulation pump, and the bath A flow path switching means that can switch between both a forward pipe and a bath return pipe to be able to pour hot water into the bathtub, and the bathtub through the bath circulation circuit. Pour hot water In the Hare hot water storage type water heater, when stopping the pouring of the closed at least the on-off valve the tub, the flow path switching unit and the both transport state, opens the on-off valve to the tub When starting pouring, when the flow path switching means is set to the both conveying state and pouring a predetermined amount into the bathtub, the pouring is started and a preset first amount smaller than the set amount is set. Until the predetermined amount is reached, the flow path switching means is set to the two transport state, and when the first predetermined amount is reached, the flow path switching means is switched from the both transport state to the one transport state, and from the set amount The flow path switching means is placed in a single conveying state until a predetermined second predetermined amount that is smaller by a predetermined amount and larger than the first predetermined amount is reached, and when the second predetermined amount is reached, the flow path switching is performed. Switch the means from the one transport state to both For example, upon reaching the set amount, storage-type hot water supply apparatus is characterized in that so as to close the opening and closing valve. A hot water storage tank that stores hot water, a bath heat exchanger that heats the bathtub water in the bathtub by exchanging heat with the hot water in the hot water storage tank, a bath pipe that connects the bathtub and the bath heat exchanger, and a bath return A bath circulation circuit comprising pipes, a bath circulation pump provided in the bath circulation circuit for circulating bath water, a hot water pipe connected to the bath circulation circuit and for pouring hot water in the hot water storage tank into the bathtub, An on-off valve that opens and closes the hot-water pipe, a single-conveyed state in which hot water can be poured into the bathtub only from the bath circulation circuit provided in the bath circulation circuit and provided with the bath circulation pump, and the bath A flow path switching means that can switch between both a forward pipe and a bath return pipe to be able to pour hot water into the bathtub, and the bathtub through the bath circulation circuit. Pour hot water In the hot water storage type hot water supply apparatus, which has a step of pouring hot water into the bathtub with the flow path switching means in a single conveying state, when stopping pouring into the bathtub, the flow path switching means is The hot water storage type hot water supply apparatus, wherein the open / close valve is closed after the both conveying states are set . 3. The hot water storage type hot water supply apparatus according to claim 2 , wherein when the pouring to the bathtub is started, the on-off valve is opened after the flow path switching means is in the both conveying state .

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