JP5734885B2 - Bath water heater - Google Patents

Description

  The present invention relates to a bath water heater that performs hot water feeding to a bathtub through a bath circulation circuit that connects the bath heat exchanger and the bathtub.

  Conventionally, in this kind of bath hot water supply apparatus, as shown in Patent Document 1, a hot water storage tank for storing hot water for hot water supply, and a pipe-shaped bath heat exchange for exchanging heat between hot water in the hot water storage tank and bath water. A bath circulation circuit that connects the bath, the bath heat exchanger and the bathtub with a bath outlet pipe and a bath return pipe, and a bath circulation pump that is provided in the bath return pipe and circulates the bath water to the bath heat exchanger. A flowing water switch for detecting the presence or absence of flowing water in the bath return pipe, a hot water circuit connected to the bath return pipe and supplying hot water from the hot water storage tank to the bathtub, and a hot water provided in the hot water circuit An on-off valve, a heat exchanger bypass pipe that bypasses the bath heat exchanger and connects the bath return pipe and the bath outlet pipe closer to the bath heat exchanger than the connection point of the hot water circuit, and the bath Return pipe and the heat exchanger There is a hot water storage type bath water heater provided with a bath three-way valve, which is provided at a junction point of a hot water pipe and switches between flowing hot water from the bath return pipe to the bath heat exchanger side or the heat exchange bypass pipe side. It was.

JP 2006-177625 A

However, with this conventional one, when the hot water valve is closed when the hot water is stopped,
If the bath heat exchanger side of the bath three-way valve is fully closed and the heat exchanger bypass tube side is fully opened, or the bath heat exchanger side is fully open and the heat exchanger bypass tube side is fully closed, the bath heat exchanger is If the bath heat exchanger side of the bath three-way valve is fully closed and the heat exchanger bypass pipe side is fully closed, only the bath return pipe to which the hot water circuit is connected is generated. There has been a problem that water hammer is biased and functional parts such as a bath circulation pump and a bath three-way valve interposed in the bath return pipe may be damaged.

  Therefore, in order to solve the above problems, the present invention provides a bath heat exchanger for heating bath water, a bath circulation circuit for connecting the bath heat exchanger and the bathtub with a bath outlet pipe and a bath return pipe, A bath circulation pump that is provided in the bath return pipe and circulates bath water to the bath heat exchanger; and a heat exchange bypass pipe that connects the bath return pipe and the bath return pipe by bypassing the bath heat exchanger. A connection point between the bath flow path switching means for switching whether the hot water from the bath return pipe flows to the bath heat exchanger side or the heat exchange bypass pipe side, and the heat exchange bypass pipe of the bath outlet pipe More than the bathtub side, than the connection point with the heat exchanger bypass pipe of the bath return pipe, the hot water circuit that is connected to either the bathtub side or the middle of the heat exchanger bypass pipe and hot water is poured into the bathtub, Provided in the hot water circuit A hot water on / off valve, and when the hot water stops, the hot water bypass pipe side is half opened while the bath heat exchanger side of the bath flow switching means is closed, and then the hot water on / off valve is closed. I stopped the hot water.

  According to the present invention, the hot water on / off valve is closed after the bath heat exchanger side of the bath flow path switching means is closed and the heat exchange bypass pipe side is half-opened. Water hammer is distributed and generated in both the bath outlet pipe and the bath return pipe to suppress the pressure fluctuation applied to the functional component, and the water hammer pressure fluctuation applied to the bath heat exchanger can also be suppressed.

Schematic configuration diagram of one embodiment of the present invention The flowchart explaining the action | operation at the time of hot water beam of the same embodiment

Next, a hot water storage type hot water supply apparatus according to an embodiment of the present invention will be described with reference to the drawings.
1 is a stainless steel hot water storage tank for storing hot water, 2 is a water supply pipe for supplying city water to the bottom of the hot water storage tank 1, 3 is a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank 1, and 4 is a water supply bypass branched from the water supply pipe 2 A hot water mixing valve for mixing hot water from the hot water discharge pipe 3 and water from the water supply bypass pipe 4 so as to reach a hot water supply set temperature, 6 is a hot water supply pipe through which hot water mixed by the hot water mixing valve 5 flows, 7 is a hot-water tap for supplying hot water from the hot-water supply pipe 6, 8 is a hot-water supply temperature sensor for detecting the hot-water supply temperature provided in the middle of the hot-water supply pipe 6, and 9 is a hot-water supply flow rate sensor for detecting the hot-water supply flow rate provided in the middle of the hot-water supply pipe 6. 10 is a hot water storage temperature sensor that is provided on the upper and lower sides of the hot water storage tank 1 to detect the hot water storage temperature, 11 is a pressure reducing valve that is provided in the water supply pipe 2 to reduce the water supply pressure of city water to a constant pressure, and 12 is a hot water storage tank. Overpressure relief to release overpressure in 1 It is a valve.

  13 is a bathtub, 14 is a bath heat exchanger provided in the upper part of the hot water storage tank 1 for heating the bath water with the heat of the hot water in the hot water storage tank 1, and 15 is an outlet of the bathtub 13 and the bath heat exchanger 14. A bath circulation circuit comprising a bath outlet pipe 16 to be connected and a bath return pipe 17 for connecting the bathtub 13 and the inlet of the bath heat exchanger 14 to connect the bath water so that it can be circulated, 18 is provided in the middle of the bath return pipe 17 A bath circulation pump that circulates the bathtub water, 19 is a heat exchange bypass pipe that connects the bath outlet pipe 16 and the bath return pipe 17 by bypassing the bath heat exchanger 14, and 20 is a bath for hot water from the bath return pipe 17. Bath flow path switching means 21 comprising a three-way valve that switches between flowing to the heat exchanger 14 side or the heat exchanger bypass pipe 19 side, 21 is provided in the bath return pipe 17 and flows from the bathtub 13 to the bath heat exchanger 14 Detect water temperature A bath temperature sensor, 22 is provided in the middle of the bath return pipe 17 and detects the presence or absence of circulation of the bath water, and 23 is a water level sensor that is connected to the side of the bath return pipe 17 close to the bathtub 13 and detects the water level of the bathtub 13. It is. Here, the bath heat exchanger 14 has a configuration in which a pipe-shaped stainless steel tube is spirally wound.

  A hot water pipe 24 is branched from the hot water supply pipe 6 and connected to the bath return pipe 17 between the connection point of the bath return pipe 17 and the heat exchanger bypass pipe 19 and the bath circulation pump 18, and 25 is in the middle of the hot water pipe 24. The hot water flow rate sensor for detecting the hot water flow rate provided in the hot water beam, the hot water beam temperature sensor 26 for detecting the hot water temperature of the hot water beam 24 provided in the hot water tube 24, and the electromagnetic valve 27 provided in the middle of the hot water tube 24. A hot water on / off valve 28 is provided downstream of the hot water on / off valve 27, and is a hopper valve that drains bathtub water to the outside when the backflow pressure from the bathtub 13 is higher than the supply water pressure upstream of the hot water on / off valve 27. Yes, a hot water supply circuit 29 for supplying hot water from the hot water storage tank 1 to the bathtub 12 is constituted by the water supply pipe 2, the hot water supply pipe 3, the water supply bypass pipe 4, the hot water supply mixing valve 5, the hot water supply pipe 6 and the hot water pipe 24. doing.

  30 is a heat pump unit as a heating means for heating the hot water in the hot water storage tank 1, and 31 is a heating circuit for connecting the hot water storage tank 1 and the heat pump unit 30 so that the hot water in the hot water storage tank 1 can be circulated.

  Reference numeral 32 denotes a remote controller, which displays various types of information related to the hot water supply device (hot water set temperature, bath set temperature, bath set hot water volume, remaining hot water volume, water heater operating state, etc.), hot water set temperature and bath set temperature, A setting switch 34 for setting and operating the bath setting hot water amount and a hot water switch 35 for instructing the bathtub 13 to supply hot water of the bath setting hot water amount are provided.

  Reference numeral 36 denotes a hot water supply temperature sensor 8, a hot water supply flow rate sensor 9, a hot water storage temperature sensor 10, a bath temperature sensor 21, a flowing water switch 22, a water level sensor 23, a hot water beam flow rate sensor 25, and hot water beam temperature sensor 26. The control unit is configured to control the operation of the valve 5, the bath circulation pump 18, the bath flow path switching unit 20, the hot water on / off valve 27, and the heat pump unit 30 and to be communicable with the remote controller 32. The control means 36 stores a program for controlling the operation of the water heater in advance, and has a calculation, comparison, storage function, and clock function.

<Boiling operation>
At the start time of a predetermined time zone where the power unit price is cheap, the control means 36 starts driving the heat pump unit 30 and takes it out from the lower part of the hot water storage tank 1 so as to start boiling the amount of hot water corresponding to the hot water supply load. The hot water is heated to the boiling set temperature and returned to the upper part of the hot water storage tank 1, hot water of the boiling set temperature is stored in a stacked form from the upper part of the hot water storage tank 1, and the hot water storage temperature sensor 18 at the bottom is a predetermined boiling end determination temperature. Is detected, the boiling operation is terminated.

<Boiling operation>
Next, when the amount of hot water in the hot water storage tank 1 is reduced due to a large amount of hot water supply or the like, there is a possibility that the hot water will run out, the control means 36 starts to drive the heat pump unit 30 and The extracted hot water is heated to the boiling set temperature and returned to the upper part of the hot water storage tank 1, and the hot water set at the boiling temperature is stored in the upper part of the hot water that has been stored up to that point, and heated for a certain period of time. And the heating operation ends.

<Hot-water supply operation>
The hot water supply operation will be described. When the hot water tap 7 is opened, city water flows into the bottom of the hot water storage tank 1 from the water supply pipe 2 and hot water is discharged from the top of the hot water storage tank 1 through the hot water discharge pipe 3. When water from the water supply bypass pipe 7 is mixed by the mixing valve 5 and passes through the hot water supply pipe 6, when the hot water supply flow rate sensor 9 detects a minimum working water amount or more, the control means 36 detects the temperature detected by the hot water supply temperature sensor 8. Is fed back to control the valve opening of the hot water supply mixing valve 5 so that the hot water supply temperature is equal to the hot water supply set temperature.

  When the flow rate becomes less than the predetermined flow rate, for example, when the hot water tap 7 is closed, the control means 36 stops the hot water supply by stopping the feedback control of the valve opening degree of the hot water mixing valve 5.

<Water filling operation>
Next, the hot water filling operation will be described based on the flowchart shown in FIG.
When the hot water switch 35 of the remote controller 32 is operated (Yes in step S1), the control means 36 closes the bath heat exchanger 14 side of the bath flow path switching means 20 in step S2, and the heat exchange bypass pipe 19 side. Are opened, and the hot water on / off valve 27 is opened in the subsequent step S3 to start priming.

  When the hot water valve 27 is opened, city water flows into the bottom of the hot water storage tank 1 from the water supply pipe 2 and hot water is discharged from the top of the hot water storage tank 1 through the hot water discharge pipe 3 to mix hot water. Water from the water supply bypass pipe 4 is mixed by the valve 5 and passes through the hot water supply pipe 6 and the hot water pipe 24, and the priming water from the bath return pipe 17 and the heat exchanger bypass pipe 19 to the bathtub 13 through the bath outlet pipe 16. Is started.

  At this time, the water hammer due to the opening of the hot water on / off valve 27 is a conveyance path in which the bath heat exchanger 14 side of the bath flow path switching means 20 is closed and the heat exchange bypass pipe 19 side is open. As a result, the bath return pipe 17 and the heat exchanger bypass pipe 19 escape to the bathtub 13 through the bath outlet pipe 16, and excessive pressure fluctuation of water hammer is suppressed.

  In the subsequent step S4, the control means 36 uses the bath return pipe 17 as a single transfer path by the bath return pipe 17 in which both the bath heat exchanger 14 side and the heat exchange bypass pipe 19 side of the bath flow path switching means 20 are closed. When the hot water flow rate sensor 25 detects that the integrated flow rate from step S3 has reached a predetermined priming water amount (Yes in step S5), the flow proceeds to the subsequent step S6. .

  In step S6, the control means 36 closes the bath heat exchanger 14 side of the bath flow path switching means 20 and closes the heat exchange bypass pipe 19 side half open, and in step S7, the hot water on / off valve 27 is turned on. Close the valve to finish priming.

  At this time, the water hammer due to the closing of the hot water on / off valve 27 returns to the bath due to the bath heat exchanger 14 side of the bath flow switching means 20 being closed and the heat exchanger bypass pipe 19 side being half open. Since the flow rate on the side of the pipe 17 is lower than that in the single conveyance state, the pressure fluctuation of the water hammer applied to the bath return pipe 17 is suppressed, and the pressure fluctuation applied to the functional parts arranged in the bath return pipe 17 is also suppressed. Since the bath heat exchanger 14 side of the bath flow path switching means 20 is closed and the heat exchange bypass pipe 19 side is in a half-open state, the flow rate of the bath outlet pipe 16 to which the bath heat exchanger 14 is connected is low. Therefore, the pressure fluctuation of the water hammer applied to the bath heat exchanger 14 is suppressed, and the sound of the bath heat exchanger 14 is prevented.

  Next, in step S8, the control means 36 sets both the transport paths in which the bath heat exchanger 14 side of the bath flow rate switching valve 20 is closed and the heat exchange bypass pipe 19 side is opened, and in step S9, the bath circulation pump 18 is started, and it is determined whether or not there is remaining hot water at a level higher than the circulation port in the bathtub 13 with the on / off state of the flowing water switch 22 at this time (step S10).

  If it is detected in step S10 that the running water switch 22 remains off, the control means 36 stops driving the bath circulation pump 22 (step S11), and then opens the hot water on-off valve 27 in step S12. Talk and start hot water.

  When the hot water valve 27 is opened, city water flows into the bottom of the hot water storage tank 1 from the water supply pipe 2 and hot water is discharged from the top of the hot water storage tank 1 through the hot water discharge pipe 3 to mix hot water. Water from the water supply bypass pipe 4 is mixed by the valve 5, passes through the hot water supply pipe 6 and the hot water pipe 24, and passes from the bath return pipe 17 and the heat exchanger bypass pipe 19 to the bathtub 13 through the bath outlet pipe 16. When the hot water supply flow rate sensor 9 detects a minimum working water amount or more, the valve opening degree of the hot water supply mixing valve 5 is feedback-controlled so that the temperature detected by the hot water temperature sensor 26 matches the bath set temperature.

  At this time, the water hammer due to the opening of the hot water on / off valve 27 is a conveyance path in which the bath heat exchanger 14 side of the bath flow path switching means 20 is closed and the heat exchange bypass pipe 19 side is open. As a result, the bath return pipe 17 and the heat exchanger bypass pipe 19 escape to the bathtub 13 through the bath outlet pipe 16, and excessive pressure fluctuation of water hammer is suppressed.

  In subsequent step S13, the integrated value of the bath flow rate from step S12 detected by the bath flow rate sensor 17 is monitored. When the integrated value becomes the bath setting hot water amount (Yes in step S13), the process proceeds to step S14, and the control means 36 The bath heat exchanger 14 side of the bath flow path switching means 20 is closed, the heat exchange bypass pipe 19 side is half open, and the hot water on / off valve 27 is closed in step S15 to end hot water.

  At this time, the water hammer due to the closing of the hot water on / off valve 27 returns to the bath due to the bath heat exchanger 14 side of the bath flow switching means 20 being closed and the heat exchanger bypass pipe 19 side being half open. Since the flow rate on the side of the pipe 17 is lower than that in the single conveyance state, the pressure fluctuation of the water hammer applied to the bath return pipe 17 is suppressed, and the pressure fluctuation applied to the functional parts arranged in the bath return pipe 17 is also suppressed. Since the bath heat exchanger 14 side of the bath flow path switching means 20 is closed and the heat exchange bypass pipe 19 side is in a half-open state, the flow rate of the bath outlet pipe 16 to which the bath heat exchanger 14 is connected is low. Therefore, the pressure fluctuation of the water hammer applied to the bath heat exchanger 14 is suppressed, and the sound of the bath heat exchanger 14 is prevented.

  On the other hand, when the flowing water switch 22 is turned on in step S10 and it is detected that there is remaining hot water at the water level above the circulation port in the bathtub 13, the control means 36 stops driving the bath circulation pump 22 (step S16). The water level sensor 23 detects the water level of the remaining hot water in the bathtub 13. At the time of detecting the water level, the control means 36 closes both the bath heat exchanger 14 side and the heat exchanger bypass pipe 19 side of the bath flow path switching means 20 to a volume unrelated to the water level measurement communicated with the water level sensor 23. The water level measurement accuracy is improved by blocking the minutes.

  And the control means 36 calculates the amount of replenishment water equivalent to a bath setting hot water amount from the detected water level of the remaining hot water, the water level corresponding to the bath setting hot water amount learned at the time of past hot water and the sectional area of the bathtub 13 ( In step S18), in step S19, the hot water valve 27 is opened to start hot water.

  When the hot water valve 27 is opened, city water flows into the bottom of the hot water storage tank 1 from the water supply pipe 2 and hot water is discharged from the top of the hot water storage tank 1 through the hot water discharge pipe 3 to mix hot water. Water from the water supply bypass pipe 4 is mixed by the valve 5, passes through the hot water supply pipe 6 and the hot water pipe 24, and passes from the bath return pipe 17 and the heat exchanger bypass pipe 19 to the bathtub 13 through the bath outlet pipe 16. When the hot water supply flow rate sensor 9 detects a minimum working water amount or more, the valve opening degree of the hot water supply mixing valve 5 is feedback-controlled so that the temperature detected by the hot water temperature sensor 26 matches the bath set temperature.

  At this time, the water hammer due to the opening of the hot water on / off valve 27 is a conveyance path in which the bath heat exchanger 14 side of the bath flow path switching means 20 is closed and the heat exchange bypass pipe 19 side is open. As a result, the bath return pipe 17 and the heat exchanger bypass pipe 19 escape to the bathtub 13 through the bath outlet pipe 16, and excessive pressure fluctuation of water hammer is suppressed.

  In the subsequent step S20, the integrated value of the bath flow rate from step S19 detected by the bath flow rate sensor 17 is monitored. When the integrated value becomes the amount of water replenished calculated in step S18 (Yes in step S20), the process proceeds to step S14 and the control is performed. The means 36 closes the bath heat exchanger 14 side of the bath flow path switching means 20 and closes the heat exchange bypass pipe 19 side half open, and closes the hot water on-off valve 27 in step S15 to heat the hot water. Exit.

  At this time, the water hammer due to the closing of the hot water on / off valve 27 returns to the bath due to the bath heat exchanger 14 side of the bath flow switching means 20 being closed and the heat exchanger bypass pipe 19 side being half open. Since the flow rate on the side of the pipe 17 is lower than that in the single conveyance state, the pressure fluctuation of the water hammer applied to the bath return pipe 17 is suppressed, and the pressure fluctuation applied to the functional parts arranged in the bath return pipe 17 is also suppressed. Since the bath heat exchanger 14 side of the bath flow path switching means 20 is closed and the heat exchange bypass pipe 19 side is in a half-open state, the flow rate of the bath outlet pipe 16 to which the bath heat exchanger 14 is connected is low. Therefore, the pressure fluctuation of the water hammer applied to the bath heat exchanger 14 is suppressed, and the sound of the bath heat exchanger 14 is prevented.

  The present invention is not limited to the above-described embodiment, but can be modified without changing the gist of the invention. The bath flow path switching means 20 is connected to the bath outlet pipe 16 and the heat exchange bypass pipe. 19 may be replaced with a switch provided with two on-off valves instead of the three-way valve as in the above-described embodiment, and the hot water pipe 24 is connected to the bath outlet pipe 16 and the heat exchange bypass pipe. It may be connected to the bath outlet pipe 16 on the bathtub 13 side or the heat exchange bypass pipe 19 in the middle of the connection point 19.

  Moreover, the bath heat exchanger 14 may be provided outside the hot water storage tank 1 as a plate heat exchanger, and the hot water in the hot water storage tank 1 may be circulated to the primary side of the plate heat exchanger. The hot water bath is not limited to a hot water bath water heater, but may be an instantaneous bath water heater using a burner as a heating means, but a hot water bath with a pipe-shaped bath heat exchanger arranged in a hot water tank When the present invention is used in a hot water supply apparatus, it is even more preferable in that the noise generated by the vibration of the bath heat exchanger can be suppressed by suppressing the pressure fluctuation of the water hammer applied to the bath heat exchanger.

13 Bath 14 Bath Heat Exchanger 15 Bath Circulation Circuit 16 Bath Outward Pipe 17 Bath Return Pipe 18 Bath Circulation Pump 19 Heat Exchange Bypass Pipe 20 Bath Flow Switch 27 Hot Water Open / Close Valve 29 Hot Water Circuit

Claims (1)

  A bath heat exchanger for heating the bath water, a bath circulation circuit for connecting the bath heat exchanger and the bath with a bath-out pipe and a bath return pipe, and bath water supplied to the bath return pipe A bath circulation pump that circulates to the heat exchanger, a heat exchange bypass pipe that connects the bath return pipe and the bath return pipe by bypassing the bath heat exchanger, and hot water from the bath return pipe More than the connection point between the bath flow path switching means for switching between the flow to the exchanger side or the heat exchange bypass pipe side and the heat exchange bypass pipe of the bath outlet pipe, the heat of the bath return pipe A hot water beam circuit connected to either the bathtub side of the connection point with the AC bypass pipe or in the middle of the heat exchange bypass pipe, and hot water is supplied to the bathtub, and a hot water opening / closing valve provided in the hot water circuit And when the hot water stops The heat exchanger bypass pipe side is half-opened while the bath heat exchanger side of the bath flow path switching unit is closed, and then the hot water valve is closed to stop the hot water beam. Bath water heater.

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