JP2012077992A - Bath water heater device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement a drainage function without fail, even when a circulating pump of a reheating circulation passage is drained.SOLUTION: The reheating circulation passage connected to a bathtub is connected to an outlet side of a hot water supply side circuit via a connection passage. The bath hot water supply device has: a drainage function for discharging drain water generated in a latent heat recovery hot water supply heat exchanger to a bathroom through the reheating circulation passage; and a drain cleaning function for supplying water from the hot water supply side circuit to the reheating circulation passage after the operation of the drainage function so as to clean a flow passage of the drain water. When a predetermined drainage operation start condition is satisfied, a drainage cleaning control means 41 implements the drainage function after water is supplied into the circulating pump 23 by a priming operation for supplying water from the hot water supply side circuit side to the reheating circulation passage via the connection passage.

Description

  The present invention relates to a bath water heater equipped with a latent heat recovery type hot water supply heat exchanger.

  Conventionally, in a hot water supply apparatus having a reheating circulation path connected to a bathtub and a hot water supply side circuit provided with a hot water supply heat exchanger, the apparatus provided with a hot water supply heat exchanger for latent heat recovery in the hot water supply side circuit has high thermal efficiency. Is widely used. However, if a hot water supply heat exchanger for latent heat recovery is provided to form a bath water heater, water vapor containing nitrogen oxides (NOx) in the combustion gas is cooled by water passing through the heat exchanger for latent heat recovery, and condensation occurs. Since drain (drain water) is generated, it is necessary to collect the drain and discharge it to the outside of the bath water heater. Therefore, it is detected by the detecting means that the collected drain has been stored in a predetermined amount, and the drain is sent to the water distribution pipe side to be drained (discharged) or led to the recirculation circuit, and the bathtub is taken from the recirculation circuit. The structure which drains to a bathroom or a bathroom is proposed (for example, refer to patent documents 1).

Japanese Patent No. 3153361

  By the way, for example, in a condominium or the like, a bath water heater is installed in a place away from a bathroom such as a veranda or a pipe shaft facing a corridor, and remote chasing is performed. When performing such remote tracking, the hot water in the bathtub must be sucked up to the bath hot water supply device, and for this purpose, a self-supplied pump having a water seal chamber in the circulation pump is used. . During the period from construction to delivery of such an apartment, or when there is a possibility of freezing in cold regions, drain the circulation pump (draining the water seal chamber) that circulates hot water in the recirculation circuit In some cases, the bath water heater is turned off (AC100V cut off). In such a case, after that, if only the hot water supply side circuit is used and the operation of passing water through the recirculation circuit is not performed at all, the drain is circulated in an attempt to guide the drain to the recirculation circuit. Even if the pump is driven, there is a problem that air is accumulated in the circulation pump and the drain cannot be retreated and guided to the circulation path side.

  The present invention has been made in order to solve the above-described problems, and the object thereof is to pass through the recirculation circuit when the water is discharged from the circulation pump provided in the recirculation circuit. Even if the drainage drainage operation of the water is to be performed, a bath water heater that can ensure the suctioning operation by filling the circulation pump water seal chamber with water, and can operate the drainage drainage function without hindrance. It is to provide.

  In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the first invention is a burner, a main hot water supply heat exchanger that absorbs sensible heat in the combustion gas of the burner, and a downstream of the flow of the combustion gas from the main hot water supply heat exchanger. And a hot water supply side circuit provided with a latent heat recovery hot water supply heat exchanger for recovering exhaust latent heat, having a recirculation circuit connected to the bathtub and circulating hot water in the recirculation circuit A circulation pump is provided, and the recirculation circuit is connected to the hot water outlet side of the hot water supply side circuit via a connection path, and drain recovery means for recovering the drain generated in the hot water heat exchanger for latent heat recovery; A drain storage means for storing the drain recovered by the drain recovery means, and a drain lead-out path for guiding the drain stored by the drain storage means to the recirculation circuit side. Guided to the circuit side A drain drainage channel for branching the drain from the recirculation circuit and draining it into the bathroom is connected, and the drain is discharged to the bathroom via the drain outlet channel, the recirculation circuit, and the drain drainage channel. A drain drainage function of the drainage circulation path of the drainage circulation path by the water passed through the connection circulation path from the hot water supply side circuit side after drain drainage by the drain drainage function. A bath hot water supply device having a drain cleaning function for cleaning, when water reaches a predetermined drain drain operation start condition, water is passed from the hot water supply side circuit side to the recirculation circuit via the connection path A means for solving the problem is provided with a drain drainage control means for performing the drain drainage function after water is introduced into the circulation pump by a priming operation.

  In addition to the configuration of the first invention, the second invention includes at least a hot water circulation operation for circulating bathtub hot water through the recirculation circuit and a water injection operation for pouring hot water into the bathtub through the recirculation circuit. The recirculation operation determining means for determining whether or not one recirculation circulation passage water flow operation has been performed, and the drain drainage control means performs the recirculation circulation passage water flow operation by the recirculation operation determination means. When it is determined that the drainage function has been performed, the drainage function is performed without performing the expelling operation.

  The present invention relates to a drain drain function for draining drain generated in a hot water supply heat exchanger for latent heat recovery to a bathroom through a drain outlet path, a recirculation circuit, and a drain drain path, and after drain drain by the drain drain function. The drain cleaning function of cleaning the drain water passage in the recirculation circuit with water passed through the recirculation circuit from the hot water supply side circuit side through the connection path is predetermined. When the drain drain operation start condition is reached, the expiratory operation of passing water from the hot water supply side circuit side through the connection path to the recirculation circuit (pure water operation by reliably injecting water into the recirculation circuit) ), Since it has a drain drainage control means for performing the drain drain function after putting water into the circulation pump, the drain drain operation start condition is reached when the circulation pump is still drained. And Also supposed to be the operation of the Ren drainage function is performed, it performs the operation from putting the water without any trouble drain drainage function in the circulation pump.

  In addition, when at least one of the hot water circulation operation for circulating hot water in the bathtub through the recirculation circulation path and the water injection operation for pouring hot water into the bathtub through the recirculation circulation path is performed, the circulation pump Therefore, when it is determined that the water recirculation operation has been performed, the drainage function is performed without performing the expiratory operation, and the expiratory operation is wasted. You can avoid doing that.

It is a block diagram which shows the control structure of one Example of the bath hot-water supply apparatus which concerns on this invention. It is explanatory drawing which shows typically the system configuration | structure of the bath hot-water supply apparatus of an Example. It is a system diagram for demonstrating the drainage path at the time of operation | movement of the drain drainage function in the bath hot-water supply apparatus of an Example. It is a system figure for demonstrating the water flow path | route at the time of operation | movement of the drain washing function in the bath hot-water supply apparatus of an Example. It is a system figure for demonstrating the water flow path | route at the time of hot water filling operation | movement in the bath hot-water supply apparatus of an Example. It is a system figure for demonstrating the water flow path | route at the time of the chasing operation | movement in the bath hot-water supply apparatus of an Example. In the bath hot-water supply apparatus of an Example, it is a flowchart which shows the operation example until it reaches drain drain operation and drain washing operation. It is a flowchart which shows the drain drainage operation example of the bath water heater of an Example.

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

  FIG. 2 schematically shows a system configuration of an embodiment of the bath water heater according to the present invention. In the figure, a combustion chamber 2 is provided in the instrument case 60, and a hot water supply side burner 1 (1 a, 1 b, 1 c) and a hot water replenishment burner 7 in the bathtub 14 are provided in the combustion chamber 2. Has been placed. These burners 1 and 7 are connected to gas pipes 55 for supplying fuel to the respective burners 1 and 7. The gas pipes 55 are used to control fuel supply / stop to the burners 1 and 7. On-off valves 51, 52, and 53, and a proportional valve 54 that can control the amount of fuel supplied to the burner 1 with the valve opening are interposed.

  A combustion fan 5 for supplying and exhausting the combustion of the burners 1 and 7 is provided below the burners 1 and 7, and the combustion fan 5 rotates through an intake port (not shown). Then, the air sucked from the outside is sent to the burners 1 and 7, and burner combustion is performed by this air and the gas supplied through the gas pipe 55. Combustion gas generated by burner combustion passes through the combustion chamber 2 and is exhausted from an exhaust port (not shown).

  A hot water supply heat exchanger (primary hot water supply heat exchanger) 4 that recovers sensible heat in the combustion gas of the burner 1 is disposed above the hot water supply side burner 1, and the combustion is performed more than the main hot water supply heat exchanger 4. A latent heat recovery hot water supply heat exchanger (secondary hot water supply heat exchanger) 6 for recovering sensible heat and latent heat of the combustion gas is provided on the downstream side of the gas flow. The main hot water supply heat exchanger 4 has a plurality of plate-like fins 3.

  A water supply pipe 8 for guiding water from a water supply source is connected to the inlet side of the latent heat recovery hot water supply heat exchanger 6, and the main hot water supply heat exchanger 4 is connected to the outlet side of the latent heat recovery hot water supply heat exchanger 6. The entrance side of is connected. A hot water supply pipe 9 is connected to the outlet side of the main hot water supply heat exchanger 4, and a hot water supply side circuit including the main hot water supply heat exchanger 4 and a hot water supply heat exchanger 6 for recovering latent heat is formed. Yes. This hot water supply side circuit preheats the water passing through the latent heat recovery hot water supply heat exchanger 6 with the heat of latent heat recovery, supplies the preheated water to the water inlet of the main hot water supply heat exchanger 4, and It has a hot water supply function of supplying hot water heated by the hot water supply heat exchanger 4 and supplying hot water from the hot water supply passage 9 to the hot water supply destination. By providing the hot water supply heat exchanger 6 for recovering latent heat, efficient heating can be performed.

  The water supply pipe 8 includes a flow rate sensor (flow sensor) 10 for detecting the flow rate of water supplied from the water supply pipe 8 and flowing into the latent heat recovery hot water supply heat exchanger 6 side, water amount control valves 11 and 56, and An incoming water thermistor (not shown) for detecting the incoming water temperature of the water flowing into the latent heat recovery hot water supply heat exchanger 6 is provided. Further, the hot water supply pipe 9 is provided with a hot water thermistor (not shown) that can detect the temperature of the hot water flowing out. The hot water supply pipe 9 and the water supply pipe 8 include a pipe 12 and a water amount control valve 11. Connected through.

  Further, a reheating heat exchanger 13 for reheating the bath water is provided above the reheating burner 7, and the reheating heat exchanger 13 is connected to the bathtub 14. 15 is provided. In this example, the reheating heat exchanger 13 is also a main heat exchanger 13a that recovers sensible heat of the combustion gas of the burner 7, and a latent heat recovery heat exchanger 13b that recovers sensible heat and latent heat in the combustion gas. The main heat exchanger 13a has a plurality of plate-like fins 3 and is formed.

  The recirculation circulation path 15 has an outward pipe 16 (16 a, 16 b) leading to the bathtub 14, a return pipe 17 from the bathtub 14, and pipe lines 18, 19, 20, 21. In addition, the inside of the instrument case 60 of these pipe lines 18, 19, 20, 21 and the forward pipe 16 and the return pipe 17 is formed by, for example, a metal pipe or a rubber pipe, and the pipe line extending from the instrument case 60 to the inside 14 of the external bathtub. Is formed of, for example, a crosslinked polyethylene tube. One end side of the pipe line 21 is connected to the reheating heat exchanger 13, and the other end side of the pipe line 21 is connected to the discharge port side of the circulation pump 23 that circulates the bath water. The pipe 21 includes a water level sensor 25 that detects a water level of the bathtub 14 by water pressure, a water flow switch 26 that is turned on when it is detected that water has flowed through the pipe 21, and the temperature of the bathtub hot water. A bath temperature sensor (not shown) for detection is provided.

  A pipe line 20 is connected to the suction port side of the circulation pump 23, and a four-way switching valve 22 formed by a four-way valve is connected to the other end side of the pipe line 20. The four-way switching valve 22 is also connected to one end side of the pipelines 18 and 19 of the recirculation circuit 15 and one end side of the pipeline 28. A return pipe 17 is connected to the other end side of the pipe lines 18 and 19, and one end side of a pouring path 27 as a connection path is connected to the other end side of the pipe line 28 via a drain circuit switching valve 30. Has been. A pouring electromagnetic valve 29 is provided in the pouring passage 27, and the other end side of the pouring passage 27 is connected to the hot water supply passage 9. With this configuration, the recirculation circuit 15 is connected to the outlet side of the hot water supply side circuit via the pouring channel 27.

  Below the latent heat recovery hot water supply heat exchanger 6, a drain recovery means 31 for recovering drain generated in the latent heat recovery hot water supply heat exchanger 6, and a drain for storing the drain recovered by the drain recovery means 31 A drain tank 32 as storage means is provided. The drain collecting means 31 and the drain tank 32 are connected via a drain pipe 33, and the drain tank 32 is provided with a drain water level detection electrode 34 for detecting the water level of the drain stored in the drain tank 32. Yes. The drain is acidic because it contains nitrogen oxides (NOx) and the like in the combustion gas. Therefore, the drain tank 31 has a drain tank (for example, calcium carbonate) in the drain for neutralizing drain drainage (drain). Summing means 35 is provided.

  A drain lead-out path 36 that guides drain stored in the drain tank 32 to the recirculation path 15 is connected to the lower side of the drain tank 32, and a check valve 37 is provided in the drain lead-out path 36. The drain lead-out path 36 is connected to the pipe line 28 and the pouring path 27 through the drain circuit switching valve 30. Further, one end side of a pipe line 59 is connected to the drain tank 32, and the other end side of the pipe line 59 is connected to a drain outlet. The pipe 59 is a pipe for guiding the drain to the drain port when the drain overflows.

  A drain drain switching unit 37 is interposed in the outgoing pipe 16 of the reheating circulation path 15, and the drain led to the recirculation circulation path 15 is supplied to the drain drain switching unit 37. A drain drainage channel 38 that branches from 15 and drains into the bathroom is connected. In the drain drainage switching unit 37, a drain drainage switching valve 39 is provided at a connection portion between the drain drainage channel 38 and the outgoing pipes 16a and 16b.

  In the bath hot water supply apparatus of this embodiment, operations such as a hot water supply function to the kitchen, hot water filling to the bathtub 14, additional hot water, additional water, reheating of the hot water in the bathtub, drain draining function, drain cleaning function, etc. are given in advance. It is performed according to the sequence program. FIG. 1 shows the control configuration. In the control device 40, a drain drain cleaning control means 41, a variable flow rate control means 44, a residual water presence / absence determination means 45, a drain cleaning water selection control means 46, a water flow An operation determination unit 47 and a pouring water / reheating control unit 42 are provided.

  The control device 40 is provided with control means for hot water supply function operation (not shown). First, an example of hot water supply function operation based on the control of the control means for hot water function operation will be briefly described. The hot water supply operation is started, for example, by opening a hot water tap (not shown) such as a kitchen or a washroom. The hot water supply operation exceeds the minimum operating flow rate through which the water supply pipe 8 is passed by the flow sensor 10 shown in FIG. When the flow rate is detected, the hot water supply function operation control means burns the hot water supply side burner 1, and the water passing through the hot water supply heat exchangers 4 and 6 (the main hot water supply heat exchanger 4 and the latent heat recovery hot water supply heat exchanger 6). The hot water is prepared by heating, and the hot water is discharged through the hot water supply pipe 9 as shown by the arrow in FIG.

  In the operation of the hot water supply function, the control means for the hot water supply function operation includes the incoming water temperature detected by the incoming water temperature sensor, the amount of hot water detected by the flow sensor 10, and the hot water temperature detected by the hot water temperature sensor ( The amount of gas supplied from the gas pipe 55 is controlled by the valve opening amount of the proportional valve 54 so as to reach the hot water supply set temperature based on the detection information such as the temperature of the hot water. The hot water supply operation is terminated when the hot water tap at the hot water supply destination is closed. That is, when the flow sensor 10 detects the stop of water flow by closing the hot water tap, the control device shuts off the gas supply to the hot water supply side burner 1 and stops the combustion of the hot water supply side burner 1.

  The pouring water / replenishing control means 42 controls the operation of the automatic hot water filling function, the operation of the additional water function, and the operation of the single hot water filling function. In addition to the hot water filling operation to fill the bathtub 14 with hot water up to a predetermined set water level (or hot water of the set water amount), a heat retaining operation and a water retaining operation are included. Note that the automatic hot water filling operation can be performed only by the hot water filling operation. The operation of the automatic hot water filling function is started when a user or the like turns on the automatic switch of the remote control device 50. As shown in FIG. When added to the watering control means 42, the pouring water / reheating control means 42 adds an automatic hot water filling start signal to the remaining water presence / absence determination means 45.

  The remaining water presence / absence determining means 45 receives the automatic hot water filling start signal from the pouring water / reheating control means 42 and drives the circulation pump 23 at the start of the automatic hot water filling operation to determine whether there is residual water in the bathtub 14. Is determined based on the detected water level of the water level sensor 25 and the presence / absence of an ON signal of the flowing water switch 26, and the determination result is added to the pouring water / refreshing control means 42 and the drain cleaning water selection control means 46.

  In response to the determination result by the remaining water presence / absence determining means 45, the pouring water / reheating control means 42 fills the bathtub 14 in accordance with a different sequence program depending on whether there is residual water in the bathtub 14 or not. It should be noted that various sequence programs can be applied for the hot water filling operation, and a detailed description thereof will be omitted. In any case, the pouring water and reheating control means 42 may be As in the operation of the hot water supply function, the valve 29 is opened, and the water passing through the hot water supply heat exchangers 4 and 6 is heated by the combustion heating of the burner 1, and the hot water is passed from the hot water supply pipe 9 to the hot water supply passage 27 to reheat. The operation of dropping into the bathtub 14 through the circulation path 15 is performed.

  In FIG. 5, the region through which hot water passes during the hot water filling operation is indicated by hatched portions, and the flow of hot water is indicated by arrows. As shown in FIG. 5, during the filling operation, the pouring line 27 and the pipe line 28 are connected via the drain circuit switching valve 30, and the pipe line 28 and the pipe line 18 are connected via the four-way switching valve 22. The pipe 19 and the pipe 20 are connected to each other, and the outgoing pipes 16a and 16b are connected to each other via the drain / drainage switching valve 39 (hereinafter, this water passage is followed by a circulation circuit). It is also called a water passage.

  When hot water filling is started, the water level of the bathtub 14 is detected by the water level sensor 25, and when the detected water level reaches the preset water level of the bathtub set in advance, the pouring water and reheating control means 42 is poured. The hot water solenoid valve 29 is closed to end the hot water filling operation. In this hot water filling operation, the pouring water and reheating control means 42 performs combustion control of the burner 1 so as to reach a preset hot water filling temperature, and hot water supply water for the hot water supply heat exchangers 4 and 6. Control the temperature.

  A flow rate sensor (flow sensor) for detecting the flow rate is provided in the pouring channel 27, and when the flow rate detected by the flow rate sensor reaches a set flow rate (a predetermined amount of pouring water into the bathtub 14), The reheating control means 42 may close the hot water solenoid valve 29 to end the hot water filling operation. In addition, in a type that calculates the amount of bathtub water from the amount of heat that is poured into the bath water in the middle of hot water filling and the amount of rise in the bathtub water temperature, the amount of bathtub water that is calculated from the calculation result and the set flow rate (setting The hot water filling operation may be terminated as described above when the difference between the hot water amount and the difference is further filled and the bathtub hot water amount reaches a set flow rate (set hot water amount).

  Normally, the operation of the heat retaining function is performed for a predetermined time (for example, 4 hours) following the hot water filling operation. During the operation of the heat retaining function, the pouring water / refreshing control means 42 activates the circulation pump 23 for a short time at predetermined time intervals, and the hot water in the bathtub 14 is reheated as shown by the arrows in FIG. 15 (see the shaded area in FIG. 6). At this time, the bath temperature sensor (not shown) detects the hot water temperature (bath temperature) of the bathtub 14, and when the detected temperature falls outside the allowable range below the set temperature of the bath, the circulation pump 23 is turned on. While driving and circulating hot water in the bathtub 14 through the recirculation circuit 15, the reheating is performed by the reheating heat exchanger 13 by the combustion of the reheating burner 7 and reheating. Then, when the temperature detected by the bath temperature sensor reaches the set temperature of the bath, the circulation pump 23 is stopped, and the combustion of the burner 7 on the reheating side is stopped.

  In addition, in the operation of the water retention function performed together with the heat retention function, the pouring water and reheating control means 42 performs the following control. That is, the water level of the bathtub 14 is monitored by the water level sensor 25, and when the water level of the bathtub 14 falls below the allowable range from the set water level, the hot water solenoid valve 29 is opened and the hot water supply operation is performed in the same manner as in the hot water filling operation. The amount of hot water that reaches the set water level from the circuit side is replenished (additional hot water operation is performed), and the water retention function is maintained to maintain the bathtub water level at the set water level.

  When the operation of lowering the temperature of the bathtub hot water is performed by operating the remote control device 50 (for example, when the “Nuruyu” switch of the remote control device 50 is operated), the hot water / reheating control means 42 The hot water solenoid valve 29 is opened to control the operation of an additional water function for pouring water not heated from the hot water supply circuit side into the bathtub 14 by a predetermined set amount, for example.

  Further, when a reheating switch provided in the remote control device 50 is manually operated, the command is applied to the pouring water / refreshing control means 42, and the hot water / refreshing control means 42 Control is performed in the same manner as the chasing operation during the hot water filling operation. By this control, a chasing single operation is performed. The hot water / refreshing control means 42 sends an end signal to the water movement determining means 47 when the hot water filling, adding hot water, additional water, and hot water for bathing are performed on the bathtub 14. .

  The water flow operation determining means 47 is at least one of the hot water circulation operation for circulating the hot water in the bathtub through the recirculation circuit 15 and the water injection operation for pouring hot water into the bathtub 14 through the recirculation circuit 15. It is determined whether or not the above has been performed. The water flow operation determining means 47 is an operation control end signal when any one of hot water filling, adding hot water, adding water, and chasing alone is performed under the control of the pouring water / refreshing control means 42. In response to this, it is determined that the recirculation circulation passage water passing operation has been performed, and the determination signal is applied to the drain waste water cleaning control means 41.

  For example, when the drain drain cleaning control means 41 receives a detection signal from the drain tank water level detection electrode 34 and reaches a predetermined drain drain operation start condition, the drain drain function stored in the drain tank 32 is operated. Functions as a drain drainage control means. Further, the drain drain cleaning control means 41 also performs an operation of a drain cleaning function described later. The drain drainage control means and the drain cleaning control means may be provided separately. In the present embodiment, the drain tank water level detection electrode 34 has, for example, four electrodes as shown in FIG. 3, and the length of the four electrodes arranged on the right side of the drawing. The two longest electrodes are the ground electrode a and the reference water level electrode (LL electrode) b that serves as a reference for stopping drainage, and the second longest electrode disposed on the left side is the low water level electrode (L electrode) c. The electrode arranged on the left side and having the shortest length is a high water level electrode (H electrode) d.

  The drain drain cleaning control means 41 receives the detection signal from the drain tank water level detection electrode 34, and when the drain in the drain tank 32 is equal to or higher than a predetermined drain drain set water level, that is, at least the low water level electrode c sets the drain water level. When detected, the drainage function of the drain stored in the drain tank 32 is operated. For example, when the drain water level is detected by the low water level electrode c and the water level is not detected by the high water level electrode d (when the water level is between the electrode c and the electrode d), in addition to that, for example, the automatic filling operation is performed. When started, the drain drain function is operated, and when the drain water level is detected by the low water level electrode c and the high water level electrode d (when the water level exceeds the electrode c and further exceeds the electrode d). , So that the drain drain function works immediately.

  In addition, when the power supply 43 is turned on in the bath water heater, the power cord of the bath water heater is first plugged into the outlet, and after the AC100V is cut off due to being disconnected from the outlet or due to a power failure, etc. There is a case where the power is turned on and a case where the operation is turned on after the operation of the remote controller 50 is turned off without AC 100V being cut off. The case of the operation on operation after the operation of the remote control device 50 is performed is, for example, output when a failure occurs during the operation of the drain drain function or the drain cleaning function and the operation stops. This is a case where the error signal is released.

  In this embodiment, the drain drain cleaning control means 41 operates the drain drain function at the time of re-energization after AC 100 V is cut off or after the operation on operation after the operation off operation of the remote control device 50 is performed. Before the start, it is confirmed whether or not a determination signal indicating whether or not the recirculation circulation passage water passage operation has been performed is added from the water passage operation judgment means 47.

  In the case of re-energization after AC100V is shut off (for example, whether or not a judgment signal indicating whether or not a recirculation circuit passage operation in the passage operation determination means 47 has been performed due to a power failure or the like is lost) If the determination signal that the recirculation circulation passage water flow operation has been performed is not added from the water flow operation determination means 47 to the drain drainage cleaning control means 41, the recirculation circulation passage water flow is performed. The drainage function of the drainage drainage function is carried out after the water is put into the circulation pump 23 by the exhalation operation of passing water through the route (see FIG. 5) and passing the water from the hot water supply side circuit side to the recirculation circuit 15 through the pouring channel 27. Perform the action.

  For example, as shown in FIG. 7, when the power cord of the bath water heater is plugged into an outlet or when the power supply is restored from a power failure (when power supply is resumed after the AC100V has been turned off once) (step S1) Later, the control device 40 of the bath hot water supply apparatus circulates the hot and cold water in the bathtub through the recirculation circuit 15 as shown in steps S4 to S7, and injects hot water into the bathtub 14 through the recirculation circuit 15. When at least one of the refilling operations is performed, the operation start signal is received and the B flag, the C flag, the D flag, and the E flag are set. Then, after setting each flag, after confirming in step S9 that a flag indicating an error during drainage / washing is not set, first in step S10, the drainage / washing control means 41 supplies the priming water. Drain cleaning is performed as well, and then the operation shifts to each flag.

  In addition, once energization is resumed after AC100V energization is stopped (when the power cord of the bath water heater is inserted into an outlet or when the power supply 43 is turned on after a power failure, an ON signal is added to the drain drain cleaning control means 41. For example, the drainage of the drain generated during the combustion test performed during the installation of the bath water heater is interrupted (that is, the drain remains in the pipe), and the circulation pump The water in 23 may be drained to prevent freezing. Therefore, in this case, at least a hot water circulation operation for circulating hot water in the bathtub through the recirculation circuit 15 and a water injection operation for injecting hot water into the bathtub 14 through the recirculation circuit 15 by the hot water / reheating control means 42. When one recirculation circulation path water-passing operation is performed, the drain drain cleaning control means 41 receives the operation start signal, and immediately before the start of the operation, first, the water is discharged into the circulation pump 23 by the expelling operation. It is necessary to insert the drainage function after this exhalation operation.

  On the other hand, in the case of the operation ON operation after the operation OFF operation of the remote control device 50 is performed without AC 100V being cut off, in step S1 in FIG. It is determined whether or not the recirculation water passage operation was performed before the operation of the drain drainage function was started. It is determined whether or not the determination signal has been applied from the water flow operation determination means 47 to the drain waste water cleaning control means 41. When the determination signal is ON (when the determination signal has not been added), step S2 in FIG. The operation of Step S14 is performed, and after the water is poured into the circulation pump 23 by the exhalation operation, the operation of the drain drain function is performed, and then the process proceeds to Step S15. Further, when the determination signal is applied (when the P plug is OFF), the expiratory operation does not have to be performed, and the process proceeds directly from step S1 to step S15.

  And the drain waste_water | cleaning control means 41 drains the drain in the drain tank 32 by the drain drainage path as shown in FIG. In addition, the area | region through which drain passes at the time of operation | movement of a drain drainage function is shown by the shaded part of FIG. 3, The flow of drain is shown by the arrow which shows the flow of the shaded part. In FIG. 3, an arrow D indicates a flow until the drain generated in the latent heat recovery hot water supply heat exchanger 4 reaches the lower side of the drain tank 32 and is led out to the drain lead-out path 38. When performing the drain drain function, the drain drain cleaning control means 41 sets the four-way switching valve 22, the drain drain switching valve 39, and the drain circuit switching valve 30 from the position in the filling operation shown in FIG. By switching, the drain is replenished as a drain drainage path and discharged to the bathroom via the circulation path 15.

  Specifically, first, the drain drain cleaning control means 41 switches the four-way switching valve 22 so that the pipe line 20 and the pipe line 28 are connected via the four-way switching valve 22. By this switching, the pipe lines 18 and 19 and the return pipe 17 are disconnected from the circulation pump 23. Next, the drain drain cleaning control means 41 switches the drain drain switching valve 39 so that the forward pipe 16 a and the drain drain channel 38 are connected via the drain drain switching valve 39. Next, the drain drain cleaning control means 41 switches the drain circuit switching valve 30 so that the drain lead-out path 36 and the pipe line 28 are connected via the drain circuit switching valve 30. In this state, the circulation pump 23 is driven, and the drain is passed through the drain lead-out path 36, the pipe 28, the pipe 21 of the reheating circulation path 15, the reheating heat exchanger 13, and the forward pipe 16a in this order, and the drain drain path 38. Through the bathroom. Then, when the drain water level is no longer detected by the reference water level electrode b of the drain tank water level detection electrode 34, the operation of the drain drain function is terminated (stopped).

  Further, the drain drain cleaning control means 41 performs the operation of the drain cleaning function after drain drain by the drain drain function. The operation of this drain cleaning function is performed by the path shown by the shaded portion in FIG. 4. The drain circuit switching valve 30 is switched and the pouring path 27 and the pipe line 28 are connected via the drain circuit switching valve 30. In this way, the drain cleaning route is set. In this state, the hot water solenoid valve 29 is opened, and the water flow path of the drain in the recirculation circuit 15 is washed by the water passed from the hot water supply side circuit side to the recirculation circuit 15 through the pouring line 27.

  The drain cleaning water selection means 46 is means for selecting whether the water passing through the recirculation circulation path 15 is heated water or unheated water when the drain cleaning function is performed under the control of the drain drain cleaning control means 41. It is. The drain cleaning water selecting means 46 operates the drain drain function by the drain drain cleaning control means 41 when it is determined by the residual water presence / absence determining means 45 that there is no residual water in the bathtub 14 at the start of the automatic filling operation. Is performed, a drain cleaning function is given to the drain drain cleaning control means 41, and after drain draining by the drain drain function, the drain drain cleaning control means 41 passes through the water not heated in the recirculation circuit 15. To perform the operation.

  On the other hand, when the remaining water presence / absence determining means 45 determines that there is residual water in the bathtub 14 at the start of the automatic hot water filling operation, the drain drain cleaning control means 41 is at a timing other than at the start of the automatic hot water filling operation. When the drain drain function is operated, a hot water cleaning command is given to the drain drain cleaning control means 41, and after drain draining by the drain drain function, the drain drain cleaning control means 41 tracks the water heated by the hot water supply side circuit. The drain cleaning function is operated through the circulation circuit 15. In this way, when the drain water cleaning control means 41 passes the heated water through the recirculation circuit 15, for example, a command is given to the pouring water / refreshing control means 42 in the hot water supply side circuit (for example, the bath set temperature). B) heating the water so that the heated water is used for drain cleaning.

  Hereinafter, this point will be described in detail. Usually, the routine drain drain function and the subsequent drain cleaning function operation are automatically performed when the drain water level is detected by the low water level electrode c and there is no residual water (when there is no remaining hot water in the bathtub) as described above. Since it is performed when the hot water filling operation is started, at the time of the operation of the drain cleaning function at this time, it is possible to eliminate waste of heat energy for heating the water by using unheated water as the drain cleaning water. . In this case, water that is not heated is used as drain cleaning water before the automatic hot water filling operation is started, but the automatic hot water filling operation is started immediately thereafter. The piping of the hot water supply side circuit is filled.

  On the other hand, when the drain water level is detected by the low water level electrode c and the high water level electrode d (that is, when the amount of hot water used is abnormally large) or from the end of the drain discharge operation of the previous drain drain function. When a predetermined set time for drain drainage (for example, 72 hours) has elapsed, for example, in the absence of a long period of time, water heated to the set temperature of the bath during the operation of the drain cleaning function is used to make hot water in the piping of the hot water supply side circuit. In the unlikely event that you take a shower immediately afterwards, it is easy to get hot water.

  As described above, the water heated to the set temperature of the bath during the operation of the drain cleaning function is used to fill the piping of the hot water supply side circuit with hot water for the following reasons. That is, for example, when the user sets the hot water supply temperature (hot water supply set temperature) to 60 ° C. and discharges the hot water from the hot water tap, the user intends to use the hot water. The user can recognize that it is filled with hot water. However, the drain drain function and the drain cleaning function are not intended to be used by the user (for example, when the user wants to perform these operations by pressing an operation button of the remote controller 50 or the like). Therefore, the user cannot recognize the operation timing.

  Therefore, when the hot water supply set temperature is set to a high temperature such as 60 ° C., water heated to the hot water supply set temperature is used during the operation of the drain cleaning function. For example, when the remote controller 50 is turned off and a cold shower is to be used, hot water is discharged from the shower, which may be dangerous. Therefore, as described above, when the drain cleaning function is performed with heated water, the temperature is comfortable for bathing. The water is heated to the set temperature of the bath set as the expected temperature), the drain cleaning function is operated, and the hot water heated to the bath set temperature is filled in the piping of the hot water supply side circuit to immediately shower The hot water of the temperature that seems to be comfortable is easy to come out.

  The variable flow rate control means 44 follows the flow rate of water (for example, 24 liters / minute) passed through the recirculation circuit 15 during the operation of the drain cleaning function rather than the flow rate of water passed through the recirculation circuit 15 during the water injection operation of pouring hot water into the bathtub 14 through the recirculation circuit 15. This is means for changing the flow rate of water passing through the circulating circulation path 15 to a small flow rate. Specifically, the flow rate variable control unit 44 adds a flow rate control command when the drain drain cleaning control unit 41 performs the operation of the drain cleaning function, and causes the drain drain cleaning control unit 41 to control the water amount control valve 56. When the drain cleaning function by the drain drain cleaning control means 41 is operated, the flow rate of water passing through the recirculation circuit 15 is set to 9 liters / minute, for example. For example, the drain drain cleaning control means 41 injects a total of 6 liters of water at this flow rate. In the present embodiment, by reducing the water flow rate during the operation of the drain cleaning function in this way, the sound of water flowing during drain cleaning (drainage sound) can be reduced.

  Further, in this embodiment, when water is passed through the recirculation circuit 15 during the water injection operation, water is injected from both sides of the forward pipe 16 and the return pipe 17, but when drain cleaning is performed through the recirculation circuit 15. Is a one-sided water flow that uses only the outgoing pipe 16 side of the recirculation circuit 15 and does not pass water to the return pipe 17 side. Therefore, when drain cleaning is performed by passing the same flow rate of water into the bathtub 14 through both the outgoing pipe 16 and the return pipe 17 to the outgoing pipe 16 side, the water pressure when the water passes is It becomes higher than during water injection operation. When a high water pressure is applied to the circulation pump 23, there is a risk that the resin circulation pump 23 or the like cannot withstand the water pressure, but there is a possibility that the water flow rate during operation of the drain cleaning function as described above. By making the flow rate smaller than the flow rate during the water injection operation, the water pressure of the water passing through the recirculation circuit 15 can be reduced, and an excessive pressure can be prevented from being applied to the circulation pump 23. In addition, since the flow rate which drains drain at the time of operation | movement of the said drain drainage function is pressurized with the pump, it is small like the flow rate of the water flowed at the time of operation | movement of a drain cleaning function.

  The drain drain cleaning control means 41 switches the drain drain switching valve 39 after the operation of the drain cleaning function is completed, and the outgoing pipes 16a and 16b are connected via the drain drain switching valve 39 as shown in FIG. Thus, the four-way switching valve 22 is switched, and the pipe line 28 and the pipe line 18 are connected via the four-way switching valve 22, and the pipe line 19 and the pipe line 20 are connected. Route).

  If the operation stops in the middle of the drainage drain function, when the recirculation circuit passage water operation is started, prior to the start of the operation, the operation of the drain drainage function and the subsequent drain cleaning function An operation may be performed. If the operation stops in the middle of the drain cleaning function, the drain cleaning function may be performed prior to the start of the operation when the recirculation circulation path water-passing operation is started.

  In addition, a storage unit that stores the fact that the drain drainage function is being operated by the drain drainage cleaning control unit 41 or the drain cleaning function may be provided in the control device 40 (substrate of the control device). Based on the information stored in the storage unit, when a failure occurs during the operation of the drain drainage function and the operation stops (when there is a memory during the operation of the drain drainage function), When the error signal output at the time of a stop due to a failure is released, or at the start of the subsequent recirculation circuit water flow operation, the drain drain function and the subsequent drain cleaning function are performed. When there is a memory that has been stopped due to a failure during the operation of the drain cleaning function, when the error signal output at the time of the stop due to the failure is released, or after that Immediately before the start of the water-passing operation, the drain cleaning function that also serves as a breathing operation may be performed.

  In addition, this invention is not limited to the said Example, It sets suitably. For example, the present invention has at least a drain drain cleaning control means 41 in the control configuration shown in FIG. 1, and when a predetermined drain drain operation start condition has been reached, The operation of the drain draining function and the subsequent drain cleaning function may be performed after the water is put into the circulation pump 23 by the exhalation operation of passing water through the recirculation circuit 15 through the path 27. The variable control means 44, the remaining water presence / absence judgment means 45, the drain cleaning water selection control means 46, and the water flow operation judgment means 47 may be omitted.

  In the embodiment, the drain drain cleaning control means 41 starts the operation of the drain drain function based on the detection signal of the drain tank water level detection electrode 34. However, the drain drain cleaning control means 41 When a predetermined drain drain setting time (for example, 72 hours) elapses from the end of the drain discharge operation of the drain drain function, the drain discharge function of the drain drain function may be performed. You may provide both the function which performs operation | movement of a drain drainage function whenever the set time for drainage passes, and the function which starts operation | movement of a drain drainage function based on the detection signal of the drain tank water level detection electrode 34.

  Further, during the drain discharge operation of the drain drain function, the drain passed through the recirculation circuit 15 is reheated and heated to, for example, 60 ° C. or more by the heat exchanger 13 to drain the drain while performing heat sterilization. Good. In addition, a drain trap is usually provided on the outlet side of the drain drainage channel 38 (the drain port side of the bathroom). If the water flowing in during the operation of the drain cleaning function remains in the drain trap, Bacteria can grow. Therefore, after the drain cleaning control means 41 performs the drain cleaning function operation, the drain water cleaning control means 41 further performs additional water passing through the drain water passage of the circulation path 15 by replenishing a predetermined amount of water. Thus, the water that has flowed into the drain trap during the operation of the drain cleaning function may be replaced with the additional water flow.

  For example, the pipe for drain cleaning (only the outward pipe 16 side) is formed using, for example, a cross-linked polyethylene pipe 10A (inner diameter 9.8 mm), and the length is, for example, 25 m at the longest, so the capacity is 1.88 + α. (0.49 × 0.49 × π × 2500/21000 = 1.88, α is the capacity of the water pipe in the appliance, etc.) liters. Therefore, considering only the drain water passage in the recirculation circulation path 15, it is sufficient to inject water of 1.88 + α liters. Water injection of 6 liters, which is about 4 liters greater than (1.88 + α liter), is performed.

That is, since there is a possibility that various germs may propagate in the drain tank 32, the drain drainage channel 38 (for example, a cross-linked polyethylene pipe 7A (inner diameter 7 mm) is a longest 2.5 m pipe with a capacity of 0.1 liter, for example). The capacity of the drain trap in the bathroom as a drain destination is, for example, 0.5 liter (for example, the reverse one drain trap main body draft surface inner diameter 113 mm, lower end inner diameter 107 mm, average inner diameter 110 mm, water pipe in the drain trap When the outer diameter is 55 mm, the sealing depth is 50 mm (from the upper end of the water distribution pipe to the lower end of the one), and the distance between the lower end of the one and the lower end of the drain trap is 20 mm, the internal capacity is {π (110/2) ² −π (110/2) ² } × (50 + 20) = about 0.5 liters), so almost all of the water exchanged by passing through the drain trap (for example, 4 liters of water that is 8 times the trap capacity) As can be up example, if the renewal rate of about 99.9% or more), and water injection a total of 6 liters of water. In addition to the reverse one drain trap, a confluence trap is known as the drain trap, but there is not much difference in the internal capacity itself. Therefore, even if the trap type changes, it is considered that water can be exchanged in the trap in the bathroom at the above flow rate.

  In addition, the 4 liters of water has the following functions. That is, the replacement is sufficient only by pouring water of 1.88 + α liter, but for example, from completion inspection to confirm that normal operation is performed by performing hot water supply operation etc. for installation, from drain cleaning after moving in It may take time. In such a case, sticking that cannot be cleaned only by replacement may occur. In particular, since the hot water supply heat exchanger 6 for recovering latent heat of the present application is close to the exhaust outlet, surrounding dust, dirt, dust, and the like may enter from the exhaust outlet. Become. The role of passing 4 liters of water is set as an amount sufficient to eliminate sticking containing formaldehyde.

  Furthermore, the details of the system configuration of the bath water heater are not particularly limited. For example, it may be a device that does not have a heat retaining function, a water retaining function, a lukewarm water function, a reheating function, a heating function, or a solar heat function. Other functions such as a heat collecting function may be provided.

  Further, when the power supply 43 is turned on when the power cord of the bath water heater is plugged into the outlet or when the power supply 43 is restored from a power failure, the drain drain cleaning control means 41 promptly switches the switching valve. Etc. may be controlled to form a drain cleaning path, and may wait in the drain cleaning path forming state until the start of the recirculation circulation path water supply operation by the pouring water and reheating control means 42. If it does in this way, possibility that drain will come out to bathtub 14 can be lost, and a priming operation can be performed prior to a follow-up circulation way water passage operation.

  Furthermore, the bath hot-water supply apparatus of this invention may provide the burner for oil combustion instead of the burner which performs the gas combustion provided in the said Example, for example.

  The bath water heater of the present invention can operate the drain drainage function without any trouble even if the drain drainage function is performed when the circulation pump provided in the recirculation circuit is drained. Since it can be performed, it can be used as, for example, a household hot water supply apparatus.

DESCRIPTION OF SYMBOLS 1 Burner 6 Hot water supply heat exchanger for latent heat recovery 15 Reheating circulation path 16, 16a, 16b Outward pipe 17 Return pipe 18, 19, 20, 21 Pipe line 22 Four-way switching valve 23 Circulation pump 27 Hot water supply path 28 Pipe line 29 Note Hot water solenoid valve 30 Drain circuit switching valve 34 Drain tank water level detection electrode 39 Drain drainage switching valve 40 Controller 41 Drain drainage cleaning control means 42 Pouring hot water / refreshing control means 43 Power supply 44 Flow rate variable control means 45 Remaining water presence / absence judgment means 46 Drain cleaning water selection control means 47 Water flow operation judgment means 50 Remote control device

Claims (2)

  A burner, a main hot water supply heat exchanger that absorbs sensible heat in the combustion gas of the burner, and a latent heat that is disposed downstream of the main hot water supply heat exchanger in the flow of the combustion gas and recovers exhaust latent heat A hot water supply side circuit provided with a hot water supply heat exchanger for recovery, a recirculation circuit connected to the bathtub, and a circulation pump for circulating hot water in the recirculation circuit, The recirculation circuit is connected to the hot water supply side of the hot water supply side circuit via a connection path, and drain recovery means for recovering drain generated in the hot water heat exchanger for latent heat recovery, and recovery by the drain recovery means A drain storing means for storing drain; and a drain lead-out path for guiding the drain stored by the drain storing means to the recirculation circulation path side, and the drain led to the recirculation circulation path side is supplied to the recirculation circulation path. The chasing circulation A drain drainage channel that branches from the road and drains into the bathroom is connected, and a drain drainage function that drains the drain to the bathroom via the drain outlet channel, the recirculation circuit, and the drain drainage channel, A bath water heater having a drain cleaning function for cleaning the recirculation circuit with water passed through the connection circuit from the hot water supply side circuit side after drain drainage by a drain water function, When a predetermined drain drain operation start condition is reached, water is introduced into the circulation pump by a priming operation in which water is passed from the hot water supply side circuit side to the recirculation circulation path through the connection path. A bath water heater having drain drain control means for performing the operation of the drain drain function.   It is a process for determining whether or not at least one recirculation water passage operation of the hot water circulation operation for circulating hot water in the bathtub through the recirculation circulation route and the water injection operation for pouring hot water into the bathtub through the recirculation circulation route is performed. Water drainage control means that performs the drain drainage function without performing the expiratory water operation when it is determined by the water flow action determining means that the recirculation circulation path water flow operation has been performed. The bath hot water supply apparatus according to claim 1.

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