JP2012242031A - Storage type bath water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clean storage type bath water heater free from scale buildup.SOLUTION: The storage type bath water heater includes a hot water supply pipe 18 having an opening/closing valve 22 for supplying hot-water/water in a hot water storage tank 2 connected to a bath circulation circuit 25 to a bathtub 7, a bath flow rate sensor 23 disposed in the hot water supply pipe 18 and detecting a flow rate of hot water supplied to the bathtub 7, a bath mixing valve 20 for mixing the hot-water/water in the hot water storage tank 2 with the water supplied from a second water supply bypass pipe 19 and supplying the hot-water/water of a set temperature to the hot water supply pipe 18, and a control means 38 having a bath reheating means implementing a bath reheating operation by a bath circulation pump 30 and a bath temperature sensor 29 of the bath circulation circuit 25 by receiving an instruction of bath reheating from a remote controller 6. As the control means 38 opens the opening/closing valve 22 after the termination of the bath reheating operation to supply hot water or water to a bath heat exchanger 28 from the hot water supply pipe 18, the bath heat exchanger 28 can be kept clean at all times.

Description

  The present invention relates to a hot water storage type bath water heater that prevents clogging of a bath heat exchanger due to scales or the like.

  Conventionally, in this type of hot water storage type bath water heater, fresh water is circulated through a hot water pipe connected to a bathtub and a hot water pipe connected to a bathtub, a bath heat exchanger, and a bath return pipe. By flowing it through the circuit, it was possible to surely prevent clogging of scales and the like in the bath heat exchanger having a particularly large pressure loss. (For example, refer to Patent Document 1.)

JP 2003-106643 A

  By the way, in this conventional hot water storage type bath water heater, when it is determined that the water level of the bathtub is reduced by a predetermined amount and drainage is performed, or there is a dedicated switch for cleaning and it is activated, Since it is a hot water storage type, when the residual water in the bath heat exchanger is heated to a high temperature by the hot water in the hot water storage tank and this high temperature residual water is discharged into the bathtub during washing operation, it is very dangerous if there are bathers. In addition, the fact that this high temperature residual water is drained as it is has a serious problem in terms of heat resistance of the drainage path.

  In order to solve the above-mentioned problems, in particular, the present invention provides a bath heat exchanger that can be heated by heat exchange between a bathtub and hot water in a hot water storage tank. A bath circulation circuit comprising a bath outlet pipe and a bath return pipe communicating the bath heat exchanger and the bathtub, and a hot water filling having an on-off valve connected to the bath circulation circuit and filling the hot water in the hot water storage tank to the bathtub A hot water at a set temperature by mixing a pipe, a bath flow sensor provided in the hot water pipe for detecting the hot water flow rate to the bathtub, and hot water in the hot water storage tank and water supplied from the second water supply bypass pipe. It has a bath mixing valve that supplies the hot water pipe and a bath replenishment means that receives a bath retreat instruction from the remote control and performs a bath retreat operation with a bath circulation pump and bath temperature sensor in the bath circulation circuit. With control means In the said control means after completion of the operation reheating the bath, in which to perform the automatic cleaning mode for supplying hot water or water from the water filling pipe by opening the on-off valve to the bath heat exchanger.

  Further, in claim 2, a bath heat exchanger capable of heating the bathtub, the bathtub water in the bathtub by heat exchange with the hot water in the hot water storage tank, and a bath outlet pipe communicating the bath heat exchanger and the bathtub And a bath circulation circuit comprising a bath return pipe, a hot water filled pipe connected to the bath circulation circuit and having an on-off valve for filling hot water in a hot water storage tank into the bathtub, and provided in the hot water filled pipe to the bathtub A bath flow sensor for detecting a hot water flow rate, a bath mixing valve for mixing hot water in the hot water storage tank and the water supplied from the second water supply bypass pipe to supply hot water at a set temperature to the hot water pipe, and a remote control And a control means having a bath heat retaining means for performing a heat retaining operation of the bath by a bath circulation pump and a bath temperature sensor of the bath circulation circuit in response to an instruction of the heat retaining operation of the bath, wherein the control means is a bath After the heat insulation operation of The was opened in which to perform the automatic cleaning mode for supplying hot water or water to the bath heat exchanger from hot water filling pipe.

  According to a third aspect of the present invention, the automatic cleaning mode is completed when at least residual water in the bath heat exchanger is replaced with new hot water or water.

  According to the first aspect of the present invention, since the washing operation is always performed after the bath reheating operation, there is no fear of accumulation of scales in the bath heat exchanger, and the washing is performed immediately after reheating. Residual water is not heated and released, and there is no concern about bather burns or heat resistance in the drainage path. It is safe and secure, and is extremely convenient to use.

  In addition, according to claim 2, after the bath heat insulation operation is completed, that is, after the operation of the scale flowing through the bath heat exchanger, the cleaning operation is always performed and the scale is not left in the pipe. There is no need for special cleaning.Furthermore, since washing is performed immediately after the heat insulation operation, the residual water is not heated and discharged, and there are concerns about the burns of the bather and the problem of heat resistance of the drainage route. It can be used with peace of mind.

  Further, according to claim 3, the automatic cleaning mode is very economical because only a small amount of hot water or water is required, and it can be completed in a short time without wasteful hot water being discharged. It is possible.

The schematic block diagram of one Embodiment of the hot water storage type bath water heater of this invention. The principal part block diagram of the same embodiment. The flowchart of the washing | cleaning driving | operation from the reheating of the same embodiment. The flowchart of the washing | cleaning driving | operation from the heat retention driving | operation of the same embodiment.

One embodiment of the hot water storage type bath water heater of the present invention will be described.
1 is a hot water storage tank unit having a hot water storage tank 2 for storing hot water, 3 is a heat pump unit as a heating means for heating the hot water in the hot water storage tank 2, and 4 is hot water circulating through the hot water storage tank 2 and the heat pump unit 3. It is a heating circulation circuit connected in an annular shape, and the hot water storage tank 2, the heat pump unit 3, and the heating circulation circuit 4 constitute a heat source machine that generates hot water. Further, 5 is a hot water tap as a hot water supply terminal provided in a kitchen or a washroom, 6 is a remote control for remotely operating the hot water storage type hot water supply device, and 7 is a bathtub.

  8 is a water supply pipe connected to the lower part of the hot water storage tank 2 to supply water to the hot water storage tank 2, 9 is a pressure reducing valve provided in the middle of the water supply pipe 8 to reduce the water supply pressure to a predetermined pressure, and 10 is provided in the middle of the water supply pipe 8 A water supply temperature sensor 11 for detecting the temperature of the hot water storage tank 11 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, and 12 is provided on the upper part of the hot water storage tank 2 for overpressure in the hot water storage tank 2. It is an overpressure relief valve with a negative pressure actuated valve that allows relief.

  13 is a first water supply bypass pipe branched from the water supply pipe 8 downstream from the pressure reducing valve 9, and 14 is a hot water supply setting in which hot water from the hot water discharge pipe 11 and water from the first water supply bypass pipe 13 are set by the remote controller 6. A hot water mixing valve that mixes the valve opening of the internal valve body so as to reach a temperature, 15 is a hot water pipe that supplies hot water mixed by the hot water mixing valve 14 to the hot water tap 5, and 16 is a hot water mixing valve 14. A hot water supply temperature sensor 17 that detects the temperature of the hot water after mixing, and a hot water supply flow rate sensor 17 that detects the flow of hot water supply in the hot water supply pipe 15 and also detects the hot water supply flow rate per hour.

  Reference numeral 18 denotes a hot water supply pipe branched from the hot water supply pipe 11, 19 denotes a second water supply bypass pipe branched from the water supply pipe 8 downstream from the pressure reducing valve 9, and 20 denotes hot hot water from the hot water supply pipe 18 and the second supply water bypass pipe. A bath mixing valve for mixing the water from 19 with the valve opening of the internal valve body adjusted so that the bath set temperature set by the remote controller 6 is reached, 21 is provided in the hot water filling pipe 18 downstream of the bath mixing valve 20 This is a hot water temperature sensor that detects the temperature of hot water after being mixed by the bath mixing valve 20.

  The hot water filling pipe 18 downstream of the bath mixing valve 20 includes an opening / closing valve 22 for starting / stopping the hot water filling to the bathtub 7 by opening and closing the hot water filling pipe 18 and a bath for detecting the hot water flow rate to the bathtub 7. A bath flow rate sensor 23 as a flow rate detection means and a double check valve 24 for preventing a reverse flow of bath water from the bathtub 7 are provided.

  The hot water filling pipe 18 is connected to a bath circulation circuit 25 that circulates the bathtub water of the bathtub 7, and this bath circulation circuit 25 is constituted by a bath outlet pipe 26 and a bath return pipe 27. The bath return pipe 27 is connected to the bath return pipe 27 at the connection between the hot water fill pipe 18 and the bath circulation circuit 25, and the end is connected to the bathtub 7. The start of the bath return pipe 27 is the hot water pipe 18 and the bath circulation. This is a bath pipe that communicates with the bath outlet pipe 26 at the connection with the circuit 25 and that is connected to the bathtub 7 through a bath heat exchanger 28 that heats the bathtub water at the end. Further, the bath circulation circuit 25 detects the water level in the bathtub 7 from the bath temperature sensor 29 for detecting the temperature of the hot water in the bath circulation circuit 25, the bath circulation pump 30 for circulating the bath water, and the water pressure of the bath water. A water level sensor 31 is provided.

  32 is a bath bypass pipe that bypasses the bath heat exchanger 28 and connects the bath return pipes 27 to each other, and 33 is provided at a connection portion between the bath bypass pipe 32 and the bath return pipe 27. As a switching means comprising an electric three-way valve that can be switched between a single conveying state in which water is poured into the bathtub 7 and a both conveying state in which the bathtub 7 is poured into the bathtub 7 and filled with hot water from both the bath outlet pipe 26 and the bath return pipe 27. It is a bath three-way valve.

  The remote controller 6 includes a hot water supply temperature setting switch 34 for setting a hot water supply set temperature, a bath temperature setting switch 35 for setting a bath set temperature, and a hot water amount setting switch ( An automatic operation switch 36 for instructing that the hot water filling amount set in (not shown) is set and then automatically entering the heat insulation operation for 4 hours, and the bath water in the bathtub 7 are circulated to the bath heat exchanger 28 A reed switch 37 is provided for repelling.

  38 is a control means for controlling driving start / stop of the heat pump unit 3 and each sensor in the hot water storage tank unit 1 to control the driving of each actuator. This control means 38 communicates with the remote controller 6 by radio or wire. When the hot water filling switch 36 of the remote control 6 is operated, the hot water filling operation for pouring hot water from the heat source machine into the bathtub 7 through the hot water filling pipe 18 is started, and the control means 38 is used for the three sides of the bath. By controlling the valve 33, a single-conveyance hot-water filling that pours into the bathtub 7 only from the bath outlet pipe 26 and a double-conveying hot-water filling that pours into the bathtub 7 from both the bath outlet pipe 26 and the bath return pipe 27 are performed. Is what you do.

  After the reheating operation by pressing the reheating switch 37 is completed, the control means 38 receives fresh hot water adjusted to the bath set temperature by the bath mixing valve 20 from the hot water filling pipe 18 and returns to the bath of the bath circulation circuit 25. An automatic cleaning mode 39 that automatically performs a cleaning operation to be supplied to the bath heat exchanger 28 via the pipe 27 is programmed. This automatic cleaning mode 39 is an automatic operation by pressing the automatic operation switch 36. Insulation operation for 4 hours after hot water filling, that is, the bath water temperature is detected by the bath temperature sensor 29 every 20 minutes. The water temperature is maintained at the bath setting temperature for 4 hours, and the automatic cleaning operation is performed after the heat retention operation is completed. The quantity sensor 23 counts the amount of hot water supplied for washing, and counts 3 L to determine that the bath heat exchanger 28 is filled with washing water, and closes the on-off valve 22 to perform automatic washing operation. Ends.

  Next, the operation of this embodiment will be described with reference to the flowchart of FIG. 3. If the reheating switch 37 of the remote controller 6 is turned on now, YES is obtained in step S1, and the control means 38 proceeds to refill the bath water in step S2. This is done by driving the bath circulation pump 30 to circulate the bath water in the bath heat exchanger 28 through the bath circulation circuit 25, so that hot hot water and heat in the upper part of the hot water storage tank 2 are heated. The temperature is raised by replacement, and it is determined in step S3 whether the bath temperature sensor 29 has detected a bath set temperature or higher. If YES, the flow proceeds to step S4 and the reheating operation is terminated.

  After the completion of the reheating operation in step S4, the automatic cleaning mode 39 of the control means 38 continues to operate, and the process proceeds to step S5 to open the on-off valve 22 and drive the bath mixing valve 20 to store the hot water and the second water. Water supplied from the water supply bypass pipe 19 is mixed so that the temperature detected by the hot water temperature sensor 21 becomes the bath set temperature, and then washed from the hot water pipe 18 into the bath heat exchanger 28 via the bath return pipe 27. The water is supplied as water, and in step S6, the bath flow rate sensor 23 counts the flow rate of this washing water, and counts 3 L. Then, the flow proceeds to step S7, the on-off valve 22 is closed, and the washing operation is terminated. At least, the bath water remaining in the bath heat exchanger 28 can be replaced with washing water, and the bath heat exchanger 28 can be reliably prevented from clogging due to the accumulation of scale. In addition, it is performed immediately after the end of the refueling operation, so that hot residual water is prevented from suddenly flowing into the bathtub 7 due to heating of the hot water, thereby solving the problem of avoiding the risk of burns and heat resistance of the drainage channel. It is.

  Next, the cleaning operation after the automatic heat insulation operation will be described with reference to the flowchart shown in FIG. 4. The hot water at the bath set temperature in step S8 which is started by turning on the automatic operation switch 36 of the remote controller 6 is passed through the hot water pipe 18. From the automatic hot water filling operation to the bathtub 7, the process proceeds to step S9 to enter the automatic heat insulation operation for 4 hours. The bath temperature sensor 29 detects the bath water temperature every 20 minutes during this 4 hours, and this detected value When the temperature is lower by 2 ° C. than the bath set temperature, the above-described reheating operation is performed until the bath set temperature is exceeded, and the process proceeds to step S10 with a 4-hour count YES, and the automatic heat retaining operation is terminated.

  After the completion of the automatic warming operation in step S10, the automatic washing mode 39 of the control means 38 operates in the same manner as described above, and the process proceeds to step S5 to open the on-off valve 22 and drive the bath mixing valve 20 to store hot water. The water supplied from the second water supply bypass pipe 19 is mixed so that the temperature detected by the hot water temperature sensor 21 becomes the bath set temperature, and the hot water from the hot water pipe 18 to the bath heat exchanger 28 through the bath return pipe 27. Then, in step S6, the bath flow rate sensor 23 counts the flow rate of this wash water and counts 3L, so that the process proceeds to step S7, the on-off valve 22 is closed, and the washing operation is finished. At least, the bath water remaining in the bath heat exchanger 28 can be replaced with washing water, and the bath heat exchanger 28 can be reliably prevented from being clogged due to the accumulation of molten metal. Since it is clean and performed immediately after the end of the automatic heat insulation operation, the hot water is suddenly prevented from flowing out into the bathtub 7 due to the heating of the hot water, thereby avoiding the risk of burns and the problem of heat resistance of the drainage channel. It is a solution.

  In this way, immediately after the operation in which the bath water circulates in the bath heat exchanger 28, the washing operation is always performed, so there is no fear that the scale gets stuck and can be removed from the bath heat exchanger 28 without fail. It can be taken out, is clean, and can always be used with peace of mind.

  In this embodiment, the mixed water adjusted to the bath set temperature by the bath mixing valve 20 is used as the cleaning water. However, the present invention is not limited to this, and the hot water storage tank 2 side of the bath mixing valve 20 is closed. The water supply bypass pipe 19 side is fully opened, and fresh water is supplied as washing water to the bath heat exchanger 28, so that it is not necessary to use the hot water in the hot water storage tank 2 that has been warmed at any time, and there is no waste. It is efficient and extremely economical.

  Furthermore, by pressing the automatic cleaning operation cancel button 40 of the remote controller 6, the automatic cleaning operation after the above-described reheating operation and after the automatic heat insulation operation can be cut, and automatic cleaning is performed in consideration of energy saving and economic efficiency. Those who say that they do not need to push the button, the flexibility of the user's choice is widened, and it is very convenient.

2 Hot water storage tank 6 Remote control 7 Bath 18 Hot water filling pipe 19 Second bypass pipe 20 Bath mixing valve 22 On-off valve 23 Bath flow sensor 25 Bath circulation circuit 26 Bath return pipe 27 Bath return pipe 28 Bath heat exchanger 29 Bath temperature sensor 30 Bath Circulating pump 38 Control means 39 Automatic cleaning mode

Claims (3)

  The bath comprises a bath heat exchanger that can heat the bath water in the bath by heat exchange with hot water in the hot water storage tank, and a bath outlet pipe and a bath return pipe that communicate the bath heat exchanger and the bathtub. A bath circulation circuit, a hot water pipe connected to the bath circulation circuit and having an on-off valve for filling hot water in a hot water storage tank into the bathtub, and a hot water flow rate to the bathtub provided in the hot water pipe A bath flow sensor, a bath mixing valve that mixes hot water in the hot water storage tank with water supplied from the second water supply bypass pipe and supplies hot water at a set temperature to the hot water pipe, and instructions for reheating the bath from the remote control And a control means having a bath replenishment means for performing a bath retreat operation by a bath circulation pump and a bath temperature sensor of the bath circulation circuit, wherein the control means is a bath retreat operation. After completion, turn on / off valve Form with hot-water storage type bath water heater, characterized in that to perform automatic cleaning mode for supplying hot water or water to the bath heat exchanger from hot water filling pipe.   The bath comprises a bath heat exchanger that can heat the bath water in the bath by heat exchange with hot water in the hot water storage tank, and a bath outlet pipe and a bath return pipe that communicate the bath heat exchanger and the bathtub. A bath circulation circuit, a hot water pipe connected to the bath circulation circuit and having an on-off valve for filling hot water in a hot water storage tank into the bathtub, and a hot water flow rate to the bathtub provided in the hot water pipe A bath flow sensor, a bath mixing valve that mixes hot water in the hot water storage tank with water supplied from the second water supply bypass pipe and supplies hot water at a set temperature to the hot water pipe, and instructions for keeping the bath warm from a remote controller And a control means having a bath heat retention means for performing a heat insulation operation of the bath by a bath circulation pump and a bath temperature sensor of the bath circulation circuit, the control means is configured to terminate the heat insulation operation of the bath, Opening the on-off valve and hot water Water storage type bath water heater, characterized in that to perform automatic cleaning mode for supplying hot water or water to the bath heat exchanger from the tube.   3. The hot water storage type bath water heater according to claim 1, wherein the automatic cleaning mode ends when at least residual water in the bath heat exchanger is replaced with new hot water or water. 4. .

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