JP5442569B2 - Bath water heater - Google Patents

Description

  The present invention relates to a bath hot water supply apparatus for determining clogging of a bath outlet pipe and a bath return pipe due to scales.

  Conventionally, in this type of bath water heater, water is supplied to each of the bath outlet pipe side and the bath return pipe side connected to the bathtub to form a bath circulation circuit, and the detection flow rate detected by the flow sensor is preset in the water supply. If the flow rate is less than or equal to the predetermined flow rate, there is one that determines that the bath piping of the water supply is abnormal due to clogging or the like (for example, see Patent Document 1).

JP 2003-294304 A

  By the way, as for the conventional bath hot water supply apparatus, generally, the way of constructing the bath outlet pipe and the bath return pipe connected to the bathtub is not uniform in each installation place. For example, the bath outlet pipe and the bath return pipe are not in the middle. There are cases where it is a torii piping, and there are cases where the bathtub is installed on the second floor or the third floor, and the bath outlet pipe and the bath return pipe are extended from the ground to the place where the bathtub is located. To do.

  As described above, in the bath outlet pipe and the bath return pipe, when construction is performed to increase the pressure loss, when the hot water is supplied to the bathtub, the flow rate of the supplied hot water decreases to a small flow rate. Become. In this case, assuming that the predetermined flow rate used for judging abnormalities such as clogging of the pipe is a value close to the small flow rate, only a small amount of scale or the like has adhered or accumulated in the pipe of the bath outlet pipe or the bath return pipe. Even if it is in a state far from the clogged state, the small flow rate may reach the predetermined flow rate. When the small flow rate reaches the predetermined flow rate, Although there is no abnormality such as the return pipe being clogged, there is a problem that it is erroneously determined that there is an abnormality.

  Therefore, in order to solve the above-mentioned problems, the present invention particularly has a structure as claimed in claim 1 in which a bath is provided with a bath, a bath circulation circuit including a bath return pipe and a bath return pipe connected to the bathtub, and the bath circulation circuit. A hot water pipe for filling hot water generated by a connected heat source machine to the bathtub, a bath flow rate detecting means provided on the hot water pipe for detecting the hot water flow rate to the bathtub, and the bath circulation circuit A single-carrying state in which only the bath outlet pipe is poured into the bathtub and filled with a single piece of hot water, and both the hot water pipe is poured into the bathtub from both the bathtub and the return pipe. In a bath hot water supply apparatus comprising switching means capable of switching to a transporting state, and a control means for performing a hot water filling operation for performing hot water filling to the bathtub by the single conveying hot water filling and the double conveying hot water filling, During hot water driving An initial piece conveyance flow rate detected by the bath flow rate detection means when performing the one piece conveyance hot water filling, and an initial double conveyance flow amount detected by the bath flow rate detection means when performing the two conveyance hot water fillings. A first determination flow rate for determining clogging in the bath outlet pipe is set based on the storage means for storing and the initial piece transfer flow rate stored in the storage means, and based on the initial both transfer flow rates stored in the storage means And a setting means for setting a second determination flow rate for determining clogging in the bath return pipe, and the bath flow rate detection means during the one-side hot water filling operation during the hot water filling operation. If the detected flow rate is less than the first determination flow rate set by the setting means, it is determined that the bath flow pipe is clogged, and the bath flow rate detection means detects when both the hot water fillings are performed. Second determination less flow amount set by the setting means, if it is and determined that no clogging of the bath forward tube and those in which a determination means and clogging of the bath return pipe.

  Further, according to claim 2, in the bath hot water supply apparatus according to claim 1, a hot water supply pipe for supplying hot water generated by the heat source device to the hot water supply terminal, and hot water from the hot water supply terminal provided in the hot water supply pipe are detected. The hot water supply flow rate detecting means is provided, and when the hot water filling operation from the next time is performed, when the one-side hot water filling to the bathtub and the hot water from the hot water supply terminal are performed at the same time, the setting means, The determination flow rate at the time of half-conveying hot water filling is set to a third judgment flow rate smaller than the first determination flow rate, and the determination means detects the bath flow rate detecting means when performing the single-conveying hot water filling. When the flow rate is less than the third determination flow rate set by the setting means, it is determined that the clogging in the bath outlet pipe has occurred.

  Moreover, in Claim 3, in the hot water supply apparatus of Claim 1 or 2, the hot water pipe for supplying the hot water produced | generated by the said heat-source equipment to a hot water supply terminal, and the hot water supply provided from this hot water supply pipe from the hot water supply terminal The hot water supply flow rate detecting means for detecting the hot water filling operation from the next time, and when both hot water filling to the bathtub and the hot water from the hot water supply terminal are performed at the same time, the setting means The determination flow rate at the time of both conveying hot water filling is set to a fourth determination flow rate that is smaller than the second determination flow rate, and the determining means is configured to perform the bath flow rate detecting means when performing both double hot water fillings. If the detected flow rate is less than the fourth determination flow rate set by the setting means and it is not determined that the clogging is in the bath return pipe, it is determined that the clogging is in the bath return pipe.

  According to a fourth aspect of the present invention, in the bath hot water supply apparatus according to the second aspect, the setting means sets the third determination flow rate according to a detected flow rate of the hot water supply flow rate detecting means.

  Further, according to claim 5, in the hot water supply apparatus according to claim 3, the setting means sets the fourth determination flow rate according to the detected flow rate of the hot water supply flow rate detection means.

  According to the first aspect of the present invention, the initial piece transfer flow rate and the initial both transfer flow rate are stored in the storage means during the first hot water filling operation, and set based on the initial piece transfer flow rate and the initial both transfer flow rate. Since the means sets the judgment flow rate for judging clogging in the bath outlet pipe and the bath return pipe, it is possible to set an appropriate judgment flow rate according to the construction status of the bath outlet pipe and the bath return pipe at each installation location. If the detection flow rate of the bath flow rate detection means is less than the first determination flow rate set by the setting means during the next hot water filling operation and the one-side hot water filling operation, It is determined that the detected flow rate of the bath flow rate detection means is less than the second determination flow rate set by the setting means and that there is no clogging in the bath outlet pipe. Have If so determines that clogging of the bath return pipe, it is possible to accurately determine the clogging of the bath forward tube and bath return pipe, in which it is possible to perform a treatment such as replacement bath pipe only with a defect.

  According to claim 2, the hot water supply pipe for supplying the hot water generated by the heat source device to the hot water supply terminal, and the hot water supply flow rate detecting means provided in the hot water supply pipe for detecting the hot water from the hot water supply terminal are provided. When the hot water filling operation from the hot water supply is performed, and when the hot water filling terminal and the hot water supply terminal are discharged at the same time, the setting means determines the determination flow rate during the hot water filling terminal from the first determination flow rate. By setting it to a small third judgment flow rate, it is possible to take into account the decrease in the hot water flow rate associated with simultaneous hot water when the single-conveying hot water filling to the bathtub and the hot water from the hot water supply terminal are performed simultaneously. The determination flow rate can be set. If the flow rate detected by the bath flow rate detection unit is less than the third determination flow rate set by the setting unit when performing the one-side hot water filling, By judging that it is clogged, Cormorants reduced water filling flow without erroneously determined as clogging of bath forward pipe, in which a clogging of the bath forward pipe can be accurately determined.

  According to claim 3, the hot water supply pipe for supplying the hot water generated by the heat source device to the hot water supply terminal, and the hot water supply flow rate detecting means provided in the hot water supply pipe for detecting the hot water from the hot water supply terminal are provided. When both hot water filling to the bathtub and the hot water from the hot water supply terminal are performed at the same time, the setting means sets the determination flow rate during both hot water fillings to be smaller than the second determination flow rate. Appropriate determination in consideration of the decrease in the hot water flow rate accompanying simultaneous hot water when both the hot water fillings to the bathtub and the hot water from the hot water supply terminal are performed at the same time by setting the fourth determination flow rate. A flow rate can be set, and when the determination means performs both hot water filling, the detection flow rate of the bath flow rate detection means is less than the fourth determination flow rate set by the setting means, and the clogging in the bath outlet pipe If not judged, clogging in bath return pipe By litho determination, without erroneously determining the reduction of the water filling the flow rate due to the simultaneous tapping and plugging of the bath return pipe, in which a clogging of the bath return pipe can be accurately determined.

  According to a fourth aspect of the present invention, the setting means sets the third determination flow rate according to the detected flow rate of the hot water supply flow rate detection means, so that the setting means reduces the hot water flow rate associated with simultaneous hot water discharge. The determination flow rate in consideration can be set more appropriately.

  According to the fifth aspect, the setting means sets the fourth determination flow rate according to the detected flow rate of the hot water supply flow rate detection means, so that the setting means reduces the filling flow rate associated with simultaneous hot water discharge. The determination flow rate in consideration can be set more appropriately.

The schematic block diagram of one Embodiment of the bath hot-water supply apparatus of this invention. Operation | movement explanatory drawing of the bath three-way valve of the same embodiment. The principal part block diagram of the same embodiment. The flowchart which shows the clogging determination method of the bath going-out pipe and the bath return pipe of the same embodiment.

Next, an embodiment of the bath water heater of the present invention will be described with reference to FIGS.
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. 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 a hot water filling valve 22 for starting / stopping the hot water filling to the bathtub 7, and a bath flow rate detecting means for detecting the hot water filling flow rate to the bathtub 7. As a bath flow sensor 23 and a double check valve 24 for preventing a reverse flow of bathtub water from the bathtub 7.

  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 includes 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 bath three-way valve 33 connects a bath return pipe 27 communicating with the bath outlet pipe 26 to an inflow side connection port 33a, and one of the two outflow side connection ports 33b and 33c has a bath in one of the connection ports 33b. The inlet side of the heat exchanger 28 is connected, the bath bypass pipe 32 is connected to the other connection port 33c, and the inner valve body is moved by driving an electric motor (not shown). As shown in FIG. 5, the bath return pipe 27 and the bath return pipe 27 are connected to each other, and the entrance side of the bath heat exchanger 28 is closed by connecting the bath return pipe 27 side and the bath bypass pipe 32 side. Both of the transport states in which hot water can be poured into the bathtub 7 from both sides and the bath return pipe 27 side communicating with the bath outlet pipe 26 and the entrance of the bath heat exchanger 28 as shown in FIG. By connecting the side and closing the bath bypass pipe 32 side, 26 and the bath return pipe 27, both the transport state in which the hot water can be poured into the bathtub 7 and the bath return pipe 27 side communicating with the bath outlet pipe 26 as shown in FIG. It is closed and can be switched at least to a single conveyance state where only the bath outlet pipe 26 can be poured into the bathtub 7 and filled.

  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 ( The hot water filling switch 36 for instructing the hot water filling operation for pouring and filling the hot water amount set in (not shown), and the hot water switch 37 for circulating the bath water in the bathtub 7 to the bath heat exchanger 28 and chasing it. Is provided.

  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.

  The control means 38 installs the bath water supply device and finishes the bath piping of the bath outlet pipe 26 and the bath return pipe 27, and then performs the one-side hot water filling in the first hot water filling operation performed in a trial operation or the like. The hot water flow rate detected by the bath flow sensor 23 (initial single-piece flow rate) and the hot water flow rate detected by the bath flow sensor 23 when performing both-bore hot water filling (initial double-flow rate) Storage means 39 for storing the above.

  The control unit 38 sets a first determination flow rate for determining clogging in the bath outlet pipe 26 due to adhesion or accumulation of scales or the like based on the initial piece conveyance flow rate stored in the storage unit 39 and stores the first determination flow rate. And setting means 40 for setting a second determination flow rate for determining clogging in the bath return pipe 27 due to adhesion or accumulation of scales or the like based on the initial both conveying flow rates stored in the means 39. . The setting means 40 sets the third determination flow rate smaller than the first determination flow rate to the initial piece transfer flow rate or the first determination at the time of simultaneous hot water discharge in which the hot water filling operation and the hot water discharge from the hot water tap 5 are performed simultaneously. The fourth determination flow rate that is set based on the flow rate and that is smaller than the second determination flow rate is set to the initial double transfer flow rate or the second transfer flow rate at the time of simultaneous hot water discharge in which the hot water filling operation and the hot water tap 5 are discharged simultaneously. 2 Set based on the judgment flow rate. The first determination flow rate and the second determination flow rate set by the setting unit 40 are set to, for example, about 40% of the initial single conveyance flow rate and the initial both conveyance flow rate stored in the storage unit 39, respectively. The 3rd determination flow rate and the 4th determination flow rate are about 30% of the initial single transfer flow rate and the initial both transfer flow rate stored in the storage unit 39, or about 80% of the first determination flow rate and the second determination flow rate. Each is set.

  Further, the control means 38 has a flow rate detected by the bath flow sensor 23 and the first set by the setting means 40 during the one-side hot water filling operation in the next hot water filling operation except the first time. When the detected flow rate of the bath flow rate sensor 23 is less than the first determined flow rate, the clogging in the bath outlet pipe 26 is determined and the bath flow rate sensor 23 is used when both the conveying hot water fillings are performed. Is compared with the second determination flow rate set by the setting means 40, and the detected flow rate of the bath flow rate sensor 23 is less than the second determination flow rate, and the clogging in the bath outlet pipe 26 occurs when the one-side-conveying hot water is filled. If it is determined that there is none, the determination means 41 for determining clogging in the bath return pipe 27 is provided, and there is a problem in either the bath pipe 26 or the bath return pipe 27 during the hot water operation. Noka It is those that can be.

  In the next hot water filling operation, the determination means 41 performs a bath flow rate when the single carrier hot water filling is performed at the same time when the hot water filling operation and the hot water discharge from the hot water tap 5 are performed simultaneously. If the detected flow rate of the sensor 23 is less than the third determination flow rate set by the setting means 40, it is determined that the bath outlet pipe 26 is clogged, and both the hot water filling and hot water from the hot water tap 5 in the hot water filling operation are determined. When the hot water is discharged at the same time, it is determined that the detected flow rate of the bath flow rate sensor 23 is less than the fourth determination flow rate set by the setting means 40 and the clogging in the bath outlet pipe 26 is performed when both hot water fillings are performed. If not, it is determined that the bath return pipe 27 is clogged.

  In addition, the determination unit 41 determines clogging in the bath return pipe 27 by comparing the detected flow rate when performing both hot water fillings with the second determination flow rate. The means 41 determines that the bath outlet pipe 26 is not clogged by comparing the detected flow rate when performing the one-piece hot-water filling with the first determination flow rate, 2 If it is determined that the blockage is clogged by comparison with the determination flow rate, it is because the clogging is suspected in the bath return pipe 27, and if the flow rate during both transports is grasped, the clogging in the bath return pipe 27 will occur. This is because it can be determined.

Next, a clogging determination method in the bath outlet pipe 26 and the bath return pipe 27, which is a characteristic operation of the bath water heater shown in FIG. 1, will be described with reference to the flowchart of FIG.
First, the control means 38 performs a trial run or the like after installing the bath hot water supply device and completing the bath piping of the bath outlet pipe 26 and the bath return pipe 27 when the bath 7 is filled with water. It is determined whether or not the operation is the first hot water filling operation (step S1). If it is determined that the operation is the first hot water filling operation, the bath three-way valve 33 is communicated with the bath outlet pipe 26 as shown in FIG. The bath return pipe 27 side to be closed is brought into a single conveying state (step S2), the hot water filling valve 22 is opened, and hot water from the hot water filling pipe 18 and water from the second water supply bypass pipe 19 are discharged. A single-feed hot water filling is started in which hot water mixed at the bath set temperature by the bath mixing valve 20 is poured into the bathtub 7 only from the hot water pipe 26 via the hot water pipe 18, and the air purge of the bath circulation pump 30 and the water level sensor 31 is started. And carrying out one-sided hot water filling The hot water filling flow rate (initial piece conveyance flow rate) detected by the bath flow rate sensor 23 is stored in the storage means 39 (step S3), and the setting means 40 takes a bath based on the initial piece conveyance flow rate stored in the storage means 39. The first determination flow rate for determining clogging in the forward pipe 26 is set. The initial piece conveyance flow rate stored in the storage means 39 is assumed to store the flow rate detected by the bath flow rate sensor 23 when the filling amount flow rate is stable after a predetermined time has elapsed since the start of piece conveyance hot water filling.

  Subsequently, the control means 38 determines whether or not a predetermined amount of hot water has been poured from the integrated value of the hot water amount detected by the bath flow sensor 23 (step S4). As shown in FIG. 2 (a), the bath return pipe 27 side and the bath bypass pipe 32 side communicating with the bath outlet pipe 26 are communicated with each other to close the inlet side of the bath heat exchanger 28 (step S5). ), Both-bore hot water filling to be poured into the bathtub 7 from both the bath going-out pipe 26 and the bath return pipe 27 is started, and the hot water flow rate detected by the bath flow rate sensor 23 when the double-bore hot water filling is performed ( The initial both transport flow rates) are stored in the storage means 39 (step S6), and the setting means 40 is a second for determining clogging in the bath return pipe 27 based on the initial both transport flow rates stored in the storage means 39. Set the judgment flow rate. Then, from the integrated value of the hot water amount detected by the bath flow sensor 23, it is determined whether or not the set amount of hot water has been poured (step S7). If it is determined that the set amount of hot water has been poured, the hot water valve 22 is closed. Then, the first hot water filling operation is completed. The initial both-conveyance flow rate stored in the storage means 39 stores the flow rate detected by the bath flow rate sensor 23 when the hot-water filling flow rate is stable after a lapse of a predetermined time from the start of both-conveying hot water filling.

  On the other hand, when it is determined in step S1 that the operation is not the first hot water filling operation, the control means 38 returns the bath three-way valve 33 to the bath return pipe 26 communicating with the bath outlet pipe 26 as shown in FIG. The pipe 27 side is closed so as to be in a single conveying state (step S8), the hot water filling valve 22 is opened, and hot hot water from the hot water filling pipe 18 and water from the second water supply bypass pipe 19 are bath mixed. The hot water mixed at the bath set temperature in 20 is poured into the bathtub 7 only from the bath outlet pipe 26 via the hot water filling pipe 18 to start the single-conveying hot water filling, and the air circulation pump 30 and the water level sensor 31 are air purged. The determination means 41 compares the hot water flow rate detected by the bath flow rate sensor 23 during the one-side hot water filling with the first determination flow rate set by the setting means 40, and the detected flow rate is the first determination flow rate. It is judged whether or not (step S ) If the detected flow rate is determined to be less than the first determination flow rate, it is determined that the inside of the bath pipe 26 is clogged due to adhesion of scales or the like, and an error indicating that the inside of the bath pipe 26 is clogged is remote controlled. 6 (step S10). It should be noted that the comparison between the detected flow rate of the bath flow sensor 23 and the first determination flow rate in step S9 starts when the hot water flow rate is stabilized after a predetermined time has elapsed after the start of one-side hot water supply.

  If the determination unit 41 determines that the detected flow rate detected by the bath flow rate sensor 23 is not less than the first determination flow rate after performing error notification in step 10 or in step S9, the control unit 38 From the integrated value of the hot water amount detected by the bath flow sensor 23, it is determined whether or not a predetermined amount of hot water has been poured since the start of pouring (step S11). Returning to step S11, when it is determined that a predetermined amount of hot water has been poured into the bathtub 7 in step S11, the bath three-way valve 33 is connected to the bath outlet pipe 26 as shown in FIG. The return pipe 27 side and the bath bypass pipe 32 side are communicated to close the inlet side of the bath heat exchanger 28 to make both transport states (step S12), and both the bath outlet pipe 26 and the bath return pipe 27 enter the bathtub 7. Pouring hot water Both conveying hot water fillings are started, and the determination unit 41 compares the hot water flow rate detected by the bath flow rate sensor 23 with the second determination flow rate set by the setting unit 40 when performing both conveying hot water fillings, It is determined whether or not the detected flow rate of the bath flow rate sensor 23 is less than the second determination flow rate (step S13), and if it is determined that the detected flow rate is less than the second determination flow rate, in the process of step S9, It is determined whether or not it is determined that there is no clogging (step S14). If it is determined that there is no clogging in the bath going-out pipe 26, it is determined that the inside of the bath return pipe 27 is clogged due to adhesion of scales or the like. An error indicating that the inside of the return pipe 27 is clogged is notified from the remote controller 6 (step S15). It should be noted that the comparison between the detected flow rate of the bath flow sensor 23 and the second determination flow rate in step S13 starts when the hot water flow rate is stabilized after a predetermined time has elapsed after the start of both hot water hot water fillings.

  When the determination unit 41 determines in step S13 that the detected flow rate detected by the bath flow rate sensor 23 is not less than the second determination flow rate, or in the process of step S9 in step S14, If it is determined that clogging has occurred, or after the error notification in step 15, the controller 38 determines whether the set amount of hot water has been poured from the accumulated amount of hot water detected by the bath flow sensor 23. If it is determined whether or not the set amount of hot water is not poured from the integrated value of the amount of hot water detected by the bath flow sensor 23, the process returns to step S13, and in step S16. If it is determined from the integrated value of the amount of hot water detected by the bath flow sensor 23 that the set amount has been poured, the hot water valve 22 is closed and the hot water operation is terminated. It is intended.

  Here, the hot water supply operation from the hot-water tap 5 is started when the hot water filling operation is performed, or the hot water filling operation is started when the hot water supply operation is started from the hot water tap 5, and the bath flow rate sensor 23 and An example will be described below with respect to the case of simultaneous hot water in which it is determined that the hot water filling to the bathtub 7 and the hot water from the hot water tap 5 are performed simultaneously from the detected flow rate of the hot water flow rate sensor 17.

  During the hot water filling operation, the hot water supply tap 5 is opened and the hot water supply flow rate sensor 17 detects the hot water when performing the single transfer hot water filling or during the single transfer hot water filling, and the control means. If 38 is determined to be simultaneous hot water discharge, the setting means 40 determines a third determination flow rate that is smaller than the first determination flow rate when the hot water operation is performed alone. In the process of step S9, the determination means 41 compares the hot water flow rate detected by the bath flow rate sensor 23 with the third determination flow rate during the one-side hot water filling, and the hot water detected by the bath flow rate sensor 23. If the tension flow rate is less than the third determination flow rate, it is determined that the inside of the bath outlet pipe 26 is clogged.

  In addition, during the hot water filling operation, both hot water hot water fillings and during both hot water hot water fillings, hot water is discharged from the hot water tap 5 and the hot water flow rate sensor 17 detects the flow of hot water. When the control means 38 determines that the hot water is discharged simultaneously, the setting means 40 determines that the determination flow rate when filling both the conveying hot water for determining clogging in the bath return pipe 27 is smaller than the second determination flow rate when the hot water filling operation is performed alone. The fourth determination flow rate is set, and in the process of step S13, the determination means 41 compares the hot water flow rate detected by the bath flow rate sensor 23 with the fourth determination flow rate during both hot water fillings, and the bath flow rate sensor 23. If it is determined that the hot water flow rate detected by is less than the fourth determination flow rate and there is no clogging in the bath outlet pipe 26 in the process of step S9 in step S14, the bath flow is determined in step S15. It is intended to determine that clogging of Ri tube 27.

  In the clogging determination method in the bath outlet pipe 26 and the bath return pipe 27 described above, the initial piece transfer flow rate and the initial both transfer flow rate are stored in the storage means 39 during the first hot water filling operation, and the initial piece transfer is performed. Since the setting means 40 sets the determination flow rate for determining clogging in the bath outlet pipe 26 and the bath return pipe 27 based on the flow rate and the initial both transport flow rates, the bath outlet pipe 26 and the bath return at each installation location are set. An appropriate determination flow rate according to the construction status of the pipe 27 can be set, and the determination means 41 detects the bath flow rate sensor 23 when performing a one-sided hot water filling in the next hot water filling operation. If the flow rate to be performed is less than the first determination flow rate set by the setting means 40, it is determined that the bath outlet pipe 26 is clogged, and the bath flow rate sensor 23 detects when both hot water fillings are performed. If the flow rate is less than the second determination flow rate set by the setting means 40 and it is determined that there is no clogging in the bath outlet pipe 26 when the single conveying hot water is filled, it is determined that the bath return pipe 27 is clogged. Clogging in the outgoing pipe 26 and the bath return pipe 27 can be determined with high accuracy, and only a defective bath pipe can be replaced.

  In addition, when the hot water filling to the bathtub 7 and the hot water from the hot water tap 5 are performed at the same time, and the hot water filling from the hot water tap 5 is performed simultaneously, By setting the determination flow rate at the time to a third determination flow rate that is smaller than the first determination flow rate, it is possible to set an appropriate determination flow rate that takes into account a decrease in the hot water flow rate associated with simultaneous hot water discharge. If it is determined that the flow rate detected by the bath flow rate sensor 23 is less than the third determination flow rate set by the setting means 40 when the single-conveying hot water is filled, it is determined that the bath outlet pipe 26 is clogged. Clogging in the bath outlet pipe 26 can be accurately determined without erroneously determining a decrease in the tension flow rate as clogging of the bath outlet pipe 26.

  In addition, when both hot water filling and hot water discharge from the hot water tap 5 are performed at the same time when the hot water filling to the bathtub 7 and the hot water from the hot water tap 5 are performed simultaneously, By setting the determination flow rate at the time to a fourth determination flow rate that is smaller than the second determination flow rate, it is possible to set an appropriate determination flow rate that takes into account a decrease in the filling flow rate associated with simultaneous hot water discharge. If it is determined that the flow rate detected by the bath flow rate sensor 23 during both conveying hot water fillings is less than the fourth determination flow rate set by the setting means 40 and that it is not determined that the bath outlet pipe 26 is clogged during one conveying hot water filling, By determining that the bath return pipe 27 is clogged, it is possible to accurately determine clogging in the bath return pipe 27 without erroneously determining that the decrease in the filling amount due to simultaneous hot water discharge is clogged in the bath return pipe 27. Can also It is.

  In the present embodiment, when the hot water filling to the bathtub 7 and the hot water from the hot water tap 5 are performed at the same time, the setting means 40 is used when the hot water feeding from the single transfer hot water and the hot water tap 5 are performed at the same time. For example, the third determination flow rate at the time of one-side hot water filling is set to about 80% of the first determination flow rate at the time of hot water operation alone, and the third determination flow rate is smaller than the first determination flow rate at the time of hot water operation alone. However, the setting means 40 can vary the amount of decrease from the first determination flow rate when the hot water filling operation is performed alone, for example, the hot water supply flow rate according to the hot water supply flow rate detected by the hot water supply flow rate sensor 17 at the time of simultaneous hot water discharge. When the hot water flow rate detected by the sensor 17 is large, the lowering width is increased, and when the hot water flow rate detected by the hot water flow rate sensor 17 is small, the lowering width is decreased to set the third determination flow rate at the time of simultaneous hot water discharge. You can do that Thus, the setting means 40 can more appropriately set the determination flow rate taking into account the decrease in the filling flow rate associated with simultaneous hot water, and the determination means 41 can more accurately determine clogging in the bath outlet pipe 26. It is something that can be done.

  In the present embodiment, when the hot water filling to the bathtub 7 and the hot water from the hot water tap 5 are performed at the same time, when both the hot water filling and the hot water from the hot water tap 5 are performed at the same time, the setting means 40 For example, the fourth determination flow rate at the time of both conveying hot water filling is set to a flow rate of about 80% of the second determination flow rate at the time of hot water operation alone, and the fourth determination flow rate is smaller than the second determination flow rate at the time of hot water operation alone. Although setting is performed, the setting means 40 can change the amount of decrease from the second determination flow rate when the hot water filling operation is performed independently, for example, the hot water supply flow rate according to the hot water supply flow rate detected by the hot water supply flow rate sensor 17 at the time of simultaneous hot water discharge. When the hot water flow rate detected by the sensor 17 is large, the lowering width is increased, and when the hot water flow rate detected by the hot water flow rate sensor 17 is small, the lowering width is decreased to set the fourth determination flow rate at the time of simultaneous hot water discharge. You can do that Thus, the setting means 40 can more appropriately set the determination flow rate taking into account the decrease in the hot water flow rate accompanying simultaneous hot water, and the determination means 41 can more accurately determine clogging in the bath return pipe 27. It is something that can be done.

  In the present embodiment, in step S9, the determination unit 41 compares the flow rate detected by the bath flow rate sensor 23 with the first determination flow rate set by the setting unit 40, and the detected flow rate is less than the first determination flow rate. If it is determined that the bath flow pipe 26 is clogged, an error notification is made. However, the determination unit 41 sets the flow rate of hot water detected by the bath flow rate sensor 23 by the setting unit 40. For example, when the state of less than one determination flow rate continues for a predetermined time, for example, it may be determined that the inside of the bath outlet pipe 26 is clogged, and an error notification may be given. When the one-side hot water filling is performed when the pressure drops, the temporary drop in the hot water flow rate due to the decrease in the water supply pressure is not erroneously determined as a clogging in the bath outlet pipe 26, and the clogging in the bath outlet pipe 26 is detected. More In which it is possible to determine the probability. In step S13 as well, similarly, the determination means 41 has a hot water flow rate detected by the bath flow rate sensor 23 that is less than the second determination flow rate set by the setting means 40, and the bath outlet pipe 26 when the one-port hot water is filled. For example, when the state determined to be clogged is not continuous for a predetermined time, it may be determined that the inside of the bath return pipe 27 is clogged and an error notification is given. The bath return pipe 27 is not misjudged as a clogging in the bath return pipe 27 due to the temporary drop in the hot water flow rate caused by the lowering of the water supply pressure when the both water feeding is performed when the water pressure is temporarily reduced. It is possible to more accurately determine clogging.

  Further, at the time of simultaneous hot water discharge, as described above, the determination unit 41 is in a state where the hot water flow rate detected by the bath flow rate sensor 23 is less than the third determination flow rate set by the setting unit 40 for a predetermined time, for example. Then, it may be determined that the inside of the bath outlet pipe 26 is clogged, and an error notification may be made, and by doing so, the determination unit 41 performs the one-sided hot water filling when the water supply pressure is temporarily reduced. At this time, it is possible to more accurately determine clogging in the bath outlet pipe 26 without misjudging the temporary drop in the hot water flow rate associated with the lowering of the water supply pressure as clogging in the bath outlet pipe 26, Further, the determination unit 41 determines that the filling water flow rate detected by the bath flow sensor 23 is less than the fourth determination flow rate set by the setting unit 40 and that there is no clogging in the bath outlet pipe 26 when the single conveying hot water filling is performed. Condition is For example, if it continues for a predetermined time, it may be determined that the inside of the bath return pipe 27 is clogged, and an error notification may be made, so that the determination means 41 can cause both conveying hot water when the water supply pressure is temporarily reduced. The clogging in the bath return pipe 27 can be more accurately determined without misjudging the temporary drop in the hot water flow rate associated with the decrease in the water supply pressure when the tension is applied as clogging in the bath return pipe 27. Is.

  The present invention is not limited to the embodiment described above. In this embodiment, 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. However, the heat source device is an electric water heater that includes a hot water storage tank for storing hot water and an electric heater disposed in the hot water storage tank, and energizes the electric heater to heat the hot water in the hot water storage tank to generate hot water. A hot water supply comprising a heat exchanger that circulates water and a combustion burner that uses kerosene or gas as fuel, and heats the water that circulates through the heat exchanger by combustion of the combustion burner to produce hot water. It may be a water heater or a gas water heater, and is not particularly limited.

  Further, in this embodiment, the bath three-way valve 33 is set to the both-transport state as shown in FIG. (B) Both conveyance states as shown in FIG.

DESCRIPTION OF SYMBOLS 2 Hot water storage tank 3 Heat pump unit 4 Heating circulation circuit 5 Hot water tap 7 Bathtub 15 Hot water supply pipe 17 Hot water supply flow rate sensor 18 Hot water supply pipe 23 Bath flow rate sensor 25 Bath circulation circuit 26 Bath return pipe 27 Bath return pipe 33 Bath three-way valve 38 Control means 39 Storage means 40 Setting means 41 Determination means

Claims (5)

  A bath, a bath circulation circuit comprising a bath outlet pipe and a bath return pipe connected to the bathtub, and a hot water filling pipe for filling the bath with hot water generated by a heat source connected to the bath circulation circuit A bath flow rate detecting means for detecting a hot water flow rate to the bathtub, and a single transfer for pouring the hot water into the bathtub only from the bath outlet pipe and for feeding the single piece of hot water. Switching means capable of switching between a state and both transport states in which both the bath outlet pipe and the bath return pipe are poured into the bathtub and both transport hot water is filled, the single transport hot water bath and the both transport hot water baths In the bath hot water supply apparatus comprising a control means for performing a hot water filling operation for filling the bathtub with the hot water filling operation, the bath flow rate detecting means when performing the one-side hot water filling operation during the first hot water filling operation. Initial piece detected by Based on the initial piece transport flow rate stored in the storage means, storage means for storing the feed flow rate and the initial both transport flow rates detected by the bath flow rate detection means when performing both hot water fillings, Setting means for setting a first determination flow rate for determining clogging in the bath outlet pipe, and for setting a second determination flow rate for determining clogging in the bath return pipe based on the initial both transport flow rates stored in the storage means; If the detected flow rate of the bath flow rate detection means is less than the first judgment flow rate set by the setting means during the hot water filling operation from the next time, while performing the one-sided hot water filling, When it is determined that the clogging in the forward pipe is being performed, and both the hot water fillings are being performed, the detected flow rate of the bath flow rate detection means is less than the second judgment flow rate set by the setting means, and the clogging in the forward bath pipe is present. If it is determined that Rinashi, bath water heater, characterized in that a and clogging the determination means of the bath return pipe.   The hot water supply apparatus according to claim 1, further comprising: a hot water supply pipe for supplying hot water generated by the heat source device to a hot water supply terminal; and a hot water supply flow rate detecting means provided in the hot water supply pipe for detecting the hot water from the hot water supply terminal. When the hot water filling operation from the next time is performed, and when the hot water filling to the bathtub and the hot water from the hot water supply terminal are performed at the same time, the setting means determines when the hot water filling is done. The flow rate is set to a third determination flow rate that is smaller than the first determination flow rate, and the determination unit sets the detection flow rate of the bath flow rate detection unit by the setting unit when performing the one-side hot water filling. If it is less than the determined third determination flow rate, the bath hot water supply device is determined to be clogged in the bath outlet pipe.   The hot water supply apparatus according to claim 1 or 2, wherein a hot water supply pipe for supplying hot water generated by the heat source device to a hot water supply terminal, and a hot water supply flow rate detecting means provided in the hot water supply pipe for detecting hot water from the hot water supply terminal. When the hot water filling operation from the next time and both hot water fillings to the bathtub and hot water discharge from the hot water supply terminal are performed simultaneously, the setting means is The determination flow rate is set to a fourth determination flow rate that is smaller than the second determination flow rate, and the detection flow rate of the bath flow rate detection means is set to the setting means when the both conveying hot water filling is performed. The bath hot water supply device is configured to determine that the clogging in the bath return pipe is less than the fourth determination flow rate set in step 1 and that the clogging in the bath return pipe is not determined.   3. The bath hot water supply apparatus according to claim 2, wherein the setting unit sets the third determination flow rate in accordance with a flow rate detected by the hot water supply flow rate detection unit.   The bath hot water supply apparatus according to claim 3, wherein the setting means sets the fourth determination flow rate in accordance with a detected flow rate of the hot water supply flow rate detection means.

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