JP2018054143A - Bath device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bath device which can determine presence/absence of water in a bathtub in a manner according to an individual difference of a driving force of a pump.SOLUTION: In a stage 1, a voltage specified by a reference voltage value Vi is supplied to a pump. In the case where the rotational frequency of the pump is lower than rotational frequency Rfor determination, the reference voltage value Vi is not corrected. In the case where the rotational frequency of the pump is equal to or greater than the rotational frequency Rfor determination, in a stage 2, the reference voltage value Vi is corrected. In the stage 2, a voltage value supplied to the pump is gradually increased, and an output value in which the rotational frequency of the pump becomes equal to or greater than a reference value Rt-r is specified. By using an output value Vs for determination, the reference voltage value Vi is corrected.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a bath apparatus, and more particularly, to a bath apparatus configured to determine the presence or absence of water in a bathtub based on a load of a pump provided in a reheating circuit.

  Conventionally, various bath apparatuses configured to determine the presence / absence of water in a bathtub based on the behavior of a pump provided in a reheating circuit have been proposed. For example, Japanese Patent Application Laid-Open No. 2011-158145 (Patent Document 1) and Japanese Patent No. 5534326 (Patent Document 2) follow up based on the rotation speed of the pump when a certain amount of power is supplied to the pump. The bath apparatus which judges the presence or absence of the water flow in a soaking circuit, and judges the presence or absence of the water in a bathtub based on the result of the said judgment is disclosed.

JP 2011-158145 A Japanese Patent No. 5534326

  There may be a difference between the behaviors of the plurality of pumps due to individual differences in the driving force of the pumps. However, in the conventional bath apparatus, the reference (the number of rotations) for determining the presence or absence of water in the bathtub has been set without considering individual differences in the driving force of the pump. It is desired that the above determination be performed more accurately by setting a reference in consideration of individual differences in pump driving force.

  The present disclosure has been devised in view of such circumstances, and the purpose of the present disclosure is to enable the determination of the presence or absence of water in the bathtub in a manner in accordance with individual differences in the driving force of the pump in the bath apparatus. is there.

  According to an aspect of the present disclosure, a recirculation circuit that circulates hot water in a bathtub via a reheating heat exchanger, a bath pump provided in the recirculation circuit, and a reference driving force for the bath pump There is provided a bath apparatus comprising determination means configured to determine that there is no water passing through the recirculation circuit when the number of rotations of the bath pump when the water is supplied is equal to or higher than the reference number of rotations. When the reference driving force is supplied to the bath pump, the determination means is configured such that when the rotation speed of the bath pump exceeds a determination rotation speed lower than the reference rotation speed, the rotation speed of the bath pump is equal to or higher than the reference rotation speed. The determination drive force is specified, and the reference drive force is corrected using the determination drive force.

  According to another aspect of the present disclosure, a recirculation circuit that circulates hot water in the bathtub via a reheating heat exchanger, a bath pump provided in the recirculation circuit, and a reference drive for the bath pump Provided is a bath apparatus provided with a determination means configured to determine that there is no water flow in the recirculation circuit when the number of rotations of the bath pump when power is supplied is within a predetermined range. Is done. The determination means determines that if the bath pump rotation speed is outside the range when the reference driving force is supplied to the bath pump and exceeds the determination rotation speed lower than the range, the bath pump rotation speed is within the range. Is determined, and the reference driving force is corrected using the determination driving force.

  Preferably, the determination unit specifies the first determination drive force and the second determination drive force as the determination drive force, and averages the first determination drive force and the second determination drive force. The value is set as the corrected reference driving force.

  Preferably, after the correction of the reference driving force is performed, the determination unit is configured to determine whether or not the recirculation circuit has water flow using the corrected reference driving force.

  Preferably, the determination means is configured to specify the determination driving force while changing the driving force supplied to the bath pump in a stepwise manner.

  According to the present disclosure, even if the rotation speed of the bath pump is less than the reference rotation speed when the reference driving force is supplied to the bath pump in a state where there is no water flow in the reheating circuit, the bath pump The reference driving force is corrected by using a determination driving force such that the rotation number becomes the reference rotation number. Thereby, even if there is an individual difference in driving force between the bath pumps, a state in which there is no water passing through the reheating circuit can be specified based on the number of rotations of the bath pump.

It is a schematic block diagram of the bath hot water supply apparatus which is an example of the bath apparatus of this indication. 2 is a schematic configuration diagram of a controller of the bath water heater 1. FIG. It is a figure which shows an example of the relationship between the output value (voltage value) of the drive electric power to a pump, and the rotation speed of a pump about a pump (1). It is a figure which shows an example of the relationship between the output value (voltage value) of the drive electric power to a pump, and the rotation speed of a pump about a pump (2). It is a figure for demonstrating correction | amendment of the reference | standard output value based on the individual difference of the driving force of a pump in this indication. It is a figure for demonstrating the concept of the correction | amendment of the output value in this indication. It is a figure for showing an example of the flow of processing for amendment of a standard output value. It is a figure for demonstrating correction | amendment of the reference | standard output value based on the individual difference of the driving force of a pump in this indication.

  Hereinafter, embodiments of a bath apparatus will be described with reference to the drawings. In the following description, the same parts and components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[Schematic configuration of bath equipment]
FIG. 1 is a schematic block diagram of a bath water heater 1 that is an example of the bath device of the present disclosure. Referring to FIG. 1, bath water heater 1 includes a heat exchanger 32, a combustion burner 30, a fan 31, and a water intake pipe 50 corresponding to a water supply channel for supplying tap water or the like in a housing 1a. And a bypass pipe 60, a hot water outlet pipe 70, and a controller 100 corresponding to a control unit for controlling and monitoring each part (valve, sensor, pump, etc.) of the bath water heater 1. The combustion burner 30 is an example of a heating unit for heating the heat exchanger. A heating part should just be able to heat a heat exchanger, and is not limited to a burner.

  The bath water heater 1 includes a controller (a controller 100 in FIG. 2 described later) for controlling the operation of each element of the bath water heater 1. The controller (CPU 101 in FIG. 2 to be described later) of the controller determines the presence or absence of water in the bathtub 8 when, for example, a restocking is instructed. When it is determined that there is water in the bathtub 8 when the instruction is input, a chasing operation is performed. When the CPU 101 determines that there is no water in the bathtub 8 when the instruction is input, the CPU 101 does not execute the chasing operation. In this case, the CPU 101 may execute a pouring operation.

  Returning to FIG. 1, a bypass pipe 60 is disposed between the water inlet pipe 50 and the hot water outlet pipe 70 corresponding to the water supply channel. A distribution valve 80 for controlling the diversion to the bypass pipe 60 is connected to the water inlet pipe 50. Further, the water inlet thermistor 110 and the flow rate sensor 150 are disposed in the water inlet pipe 50. The incoming water thermistor 110 detects the incoming water temperature of the water supply channel, that is, the temperature of tap water. Depending on the opening degree of the distribution valve 80, a part of the water supply amount is diverted from the water inlet pipe 50 to the bypass pipe 60.

  The heat exchanger 32 is heated by the combustion operation of the combustion burner 30. The water in the water intake pipe 50 is heated by the heat exchanger 32. Hot water heated to a predetermined temperature is discharged from the hot water discharge pipe 70. The outlet pipe 70 is connected to the bypass pipe 60 at the junction 75. Therefore, hot water from the hot water outlet pipe 70 and water from the bypass pipe 60 are mixed, and hot water set in the operation unit 104 is supplied to a hot water supply location including the hot water tap 190 and the bathtub 8 such as a kitchen or bathroom. The

  The outlet pipe 70 corresponding to the hot water supply path is provided with a flow rate adjusting valve 90 and a temperature sensor 130 for controlling the hot water supply flow rate. The temperature sensor 130 detects the hot water temperature after the water from the bypass pipe 60 is mixed.

  In addition, a pouring electromagnetic valve 132 for pouring (supplying hot water) to the bathtub 8 is provided on the downstream side of the flow rate adjusting valve 90.

[Circulating circuit]
The bath water heater 1 in FIG. 1 includes a circulation circuit. The circulation circuit is formed so as to reach from a suction port provided in the bathtub 8 to a discharge port provided in the bathtub 8 via a heat exchanger. Specifically, the circulation circuit is provided with a return circuit indicated by an arrow “flow return” and a forward circuit indicated by an arrow “flow backward” in the drawing. The upstream end of the return circuit (that is, the bathtub 8 side) is connected to the suction side of the circulation adapter 81 installed in the bathtub 8. Further, the downstream end of the forward circuit (that is, the bathtub 8 side) is connected to the discharge side of the circulation adapter 81. A return temperature thermistor 34 for measuring the water temperature in the pipe is provided in the return circuit of the circulation circuit. The bath return temperature thermistor 34 measures the temperature of the bath water entering the return circuit from the bath 8. Further, the going-out circuit is provided with a going-up temperature thermistor 36 for measuring the temperature of the hot water discharged into the bathtub 8.

  When the pump 33 is operated so that the water (or hot water) in the bathtub 8 circulates through the above-described circulation circuit, the bathtub water from the bathtub 8 passes through the suction port of the circulation adapter 81, the return pipe and the heat exchanger, and The route to the discharge port 86 of the circulation adapter 81 is circulated via the forward piping. Thereby, the water temperature in the circulation circuit including the bathtub 8 can be made uniform.

[Configuration of Controller 100]
FIG. 2 is a schematic configuration diagram of the controller 100 of the bath water heater 1. The controller 100 sends control signals for opening / closing or driving the pumps to various valves and various pumps in the CPU (Central Processing Unit) 101, the bath water heater 1, and various sensors (such as thermistors). An interface 103 for inputting detection signals from a temperature sensor, a flow rate sensor, etc., an operation unit 104, an output unit 105 for outputting information related to the operation of the hot water heater 1, a timer 106, and a storage device 102. The CPU 101 implements a time measuring function by using the timer 106. The operation unit 104 includes a switch, a button, and the like for receiving a user operation (for example, an operation for inputting an instruction related to driving) on the bath water heater 1. The instruction relating to the operation includes a set value for the amount of hot water and / or a set value for temperature when the bathtub 8 is filled with hot water.

  The storage device 102 includes a volatile or non-volatile memory for storing programs and data. The memory | storage device 102 memorize | stores the reference driving force memory | storage part 1021 for storing the reference driving force (reference voltage value Vi mentioned later) which is a reference value for detecting the presence or absence of the water in the bathtub 8, and other data. And a data storage unit 1022 for the purpose.

  With further reference to FIG. 1, the controller 100 determines that the flow rate detected by the flow sensor 150 is the minimum operating flow rate (MOQ) when the hot water tap 190 is opened with the operation start switch of the bath water heater 1 turned on. Is exceeded, the combustion operation by the combustion burner 30 is turned on. In the hot water filling mode for the bathtub 8, the CPU 101 controls the opening of various valves (distribution valve 80, flow rate adjustment valve 90, and pouring electromagnetic valve 132). Thereby, pouring to the bathtub 8 is started. The CPU 101 detects the amount of pouring water into the bathtub 8 from the output of the flow sensor, compares the detected pouring amount with the amount of hot water, and ends the pouring operation based on the comparison result.

  The CPU 101 controls each part of the bath water heater 1 according to the operation mode of the bath water heater 1. For example, when the condition is satisfied in the heat retention mode, the CPU 101 controls each part so as to keep the hot water temperature of the bathtub 8 at the set temperature.

  The CPU 101 instructs the power supply circuit 330 to supply the drive voltage to the pump 33 via the interface 103. The controller 100 includes a rotation detector 331 for detecting the rotation speed of the pump 33.

  For example, the CPU 101 determines the presence or absence of water flow in the circulation circuit of the hot water heater 1 based on the number of rotations of the pump 33 when a predetermined voltage is supplied to the pump 33. The CPU 101 determines the presence or absence of water in the bathtub 8 according to the result of the determination.

  In one example, the CPU 101 determines that the rotation speed of the pump 33 when the reference voltage value Vi is supplied to the pump 33 is equal to or higher than the lower limit value of the reference range (“rotation speed Rt−r” in FIG. 3 and the like described later). It is determined that there is no water flow in the circulation circuit, and accordingly, it is determined that there is no water in the bathtub 8. In another example, when the rotation speed of the pump 33 when the reference voltage value Vi is supplied to the pump 33 is less than the lower limit value (rotation speed Rt-r) of the reference range, the water flow in the circulation circuit is not performed. It is determined that there is water, and accordingly, it is determined that there is water in the bathtub 8.

[Relationship between individual differences in pump driving force and rotation speed]
Next, changes in the rotation speed due to individual differences in pump driving force will be described. In the following description, when the two pumps used as the pump 33 are distinguished from each other, the descriptions “pump (1)” and “pump (2)” are used.

  FIG. 3 is a diagram illustrating an example of the relationship between the output value (voltage value) of the driving power to the pump and the rotation speed of the pump for the pump (1). In FIG. 3, a line L <b> 11 indicates a relationship when there is water in the bathtub 8. A line L12 indicates a relationship when there is no water in the bathtub 8.

  As indicated by both lines L11 and L12, the higher the output value, the higher the rotational speed of the pump 33. Compared with the line L11, the line L12 shows a high rotational speed for the same output value. This is because when there is no water in the bathtub 8 (line L12), compared to when there is water in the bathtub 8 (line L11), there is no load due to water.

  In the example of FIG. 3, for example, the CPU 101 determines whether or not the rotational speed of the pump 33 is equal to or higher than a reference value Rt−r at a predetermined output value Vx. CPU101 will judge that there is no water in the bathtub 8, if the said rotation speed is more than the reference value Rt-r. If the reference value is less than the reference value Rt-r, the CPU 101 determines that there is water in the bathtub 8.

  FIG. 4 is a diagram illustrating an example of the relationship between the output value (voltage value) of the driving power to the pump and the rotational speed of the pump for the pump (2). In FIG. 4, a line L <b> 21 indicates a relationship when there is water in the bathtub 8. Line L22 shows the relationship when there is no water in bathtub 8.

  As indicated by both the line L21 and the line L22 in FIG. 4, the rotational speed of the pump 33 increases as the output value increases. However, as compared with the line L11 in FIG. 3, the line L21 in FIG. 4 generally has a lower rotational speed for the same output value. Compared to the line L12 in FIG. 3, the line L22 in FIG. 4 generally has a lower rotational speed for the same output value. In any of the lines L21 and L22 in FIG. 4, the rotational speed of the pump 33 with respect to the output value Vx does not exceed the reference value Rt-r.

  Therefore, when the pump (2) is employed as the pump 33, the presence or absence of water in the bathtub 8 may not be determined even when the output value Vx and the reference value Rt-r are used.

[Correction of reference output value based on individual differences in pump driving force]
FIG. 5 is a diagram for describing the correction of the reference output value based on the individual difference of the driving force of the pump 33 in the present disclosure. FIG. 5 shows lines L21 and L22 for the pump (2) as in FIG.

  In FIG. 5, instead of the output value Vx in FIG. 4, the output value Vy is set as an output value for determining the presence or absence of water in the bathtub 8. According to FIG. 5, when the electric power specified by the output value Vy is supplied to the pump 33, the rotational speed is lower than the reference value Rt-r on the line L <b> 21, but the rotational speed is the reference value Rt-r on the line L <b> 22. Has reached. That is, in the example shown in FIG. 5, by using the output value Vy and the reference value Rt-r, it is possible to determine the presence or absence of water in the bathtub 8 based on the rotation speed of the pump (2).

  According to the present disclosure, as described mainly with reference to FIGS. 3 and 4, even when there is an individual difference in driving force among the plurality of pumps 33, mainly referring to FIGS. 4 and 5. As described above, it is possible to determine the presence or absence of water in the bathtub 8 using the pump 33 by changing the output value to the pump 33 for determination.

[Mode of output value correction]
As described with reference to FIG. 5, the present disclosure changes the reference voltage value. An example of the change is to correct a default value of a judgment output value (for example, a voltage value). Another example is to further correct the output value after correction. FIG. 6 is a diagram for describing the concept of output value correction in the present disclosure. FIG. 6 shows two stages (stage 1 and stage 2) for the correction.

In stage 1, the pump 33 is supplied with a voltage specified by the reference voltage value Vi. The reference voltage value Vi is a default value of a voltage for determination or a value obtained by correcting the default value. The CPU 101 classifies the state of the bathtub 8 based on whether or not the rotational speed of the pump 33 at that time is equal to or higher than a predetermined rotational speed (determination rotational speed R ₀ ). The determination rotational speed _R0 is lower than the determination rotational speed (reference value Rt-r).

When the rotation speed of the pump 33 is lower than the determination rotation speed _R0 , the CPU 101 does not correct the reference voltage value Vi. The CPU 101 corrects the reference voltage value Vi when the rotation speed of the pump 33 is equal to or higher than the determination rotation speed _R0 . In the example of FIG. 6, when the behavior of the pump 33 follows the line L21, the reference voltage value Vi is not corrected. When the behavior of the pump 33 follows the line L22, the reference voltage value Vi is corrected.

  In step 2, the CPU 101 corrects the reference voltage value Vi. More specifically, the CPU 101 specifies an output value at which the rotation speed of the pump 33 is equal to or higher than the reference value Rt-r by gradually increasing the voltage value supplied to the pump 33. In stage 2 of FIG. 6, the identified output value is shown as the determination output value Vs.

  The CPU 101 corrects the reference voltage value Vi using the determination output value Vs. In one example, the CPU 101 replaces the reference voltage value Vi with the determination output value Vs. In another example, the CPU 101 specifies the determination output value Vs as in Step 2 a plurality of times, and replaces the reference voltage value Vi with an average value of the obtained plurality of determination output values Vs.

[Processing flow for correcting the standard output value]
FIG. 7 is a diagram illustrating an example of a process flow for correcting the reference output value. The process in FIG. 7 is started, for example, by operating a bath operation button or a test button in the operation unit 104 (FIG. 2).

  Referring to FIG. 7, in step S <b> 100, CPU 101 starts outputting a voltage to pump 33. The output value is the reference voltage value Vi. Thereafter, the control proceeds to step S110.

In step S110, the CPU 101 determines whether or not the rotation speed of the pump 33 is equal to or higher than the determination rotation speed _R0 . If the rotation speed of the pump 33 is greater than or equal to the determination rotation speed _R0 , the CPU 101 advances the control to step S120. If the rotation speed of the pump 33 is less than the determination rotation speed R ₀ , the CPU 101 ends the process of FIG.

  In step S120, the CPU 101 determines whether or not the rotation speed of the pump 33 is included in the range from the first reference value Rt-r to the second reference value Rt + r. The first reference value Rt-r is a value obtained by subtracting a predetermined value r from the reference value Rt, as shown in FIG. The second reference value Rt + r is a value obtained by adding the predetermined value r to the reference value Rt. If the CPU 101 determines that the rotational speed of the pump 33 is not included in the above range, the control proceeds to step S130. When the CPU 101 determines that the rotation speed of the pump 33 is included in the above range, the control proceeds to step S140.

  In step S130, the CPU 101 changes the voltage value output to the pump 33 by a predetermined value (ΔV), and then returns control to step S120.

  When it is determined in step S120 that the rotation speed of the pump 33 is smaller than the first reference value Rt-r, in step S130, the CPU 101 increases the voltage value output to the pump 33 by the predetermined value. When it is determined in step S120 that the rotation speed of the pump 33 is greater than the second reference value Rt + r, in step S130, the CPU 101 decreases the voltage value output to the pump 33 by the predetermined value.

  Under the control of step S120 and step S130, the voltage value output to the pump 33 is changed in stages. When the rotational speed of the pump 33 reaches the above range (from the first reference value Rt−r to the second reference value Rt + r), the CPU 101 advances the control to step S140.

  In step S140, the CPU 101 stores the voltage value (determination output value Vs (N)) output to the pump 33 at that time in the data storage unit 1022. Thereafter, the control proceeds to step S150. The numerical value N is an integer variable used in the process of FIG. 7 and represents the number of times the process of FIG. 7 has been executed. In the bath water heater 1, the initial value of the numerical value N is “1”. The numerical value N is updated by 1 in step S170 described later.

  In step S150, the CPU 101 determines whether or not the current value of the numerical value N is 2 or more. If the CPU 101 determines that the value of the numerical value N is 2 or more, the control proceeds to step S160. If the CPU 101 determines that the value of the numerical value N is 1 or less, the process of FIG.

  In step S160, the CPU 101 updates the value of the reference voltage value Vi according to the equation (1) in FIG. Equation (1) calculates the updated reference voltage value Vi using the determination output value Vs (N) and the determination output value Vs (N-1). By calculating the updated reference voltage value Vi according to the equation (1), the reference voltage value Vi is determined by taking the numerical value N into consideration, and the determination output value Vs (N) and the determination output value Vs (N−1). ). Thereafter, the control proceeds to step S170.

  In step S170, the CPU 101 updates the value of the numerical value N by one, and then ends the process of FIG.

  In the process of FIG. 7 described above, for example, when the process of FIG. 7 is performed once, the determination output value Vs (1) is stored. Correction (update) of the reference voltage value Vi is not executed. This is because the value of the numerical value N is “1”. In the second process, after the determination output value Vs (2) is stored in step S140, the reference voltage value Vi is corrected. In this correction, the judgment output value Vs (1) obtained by the first process and the judgment output value Vs (2) obtained by the second process are used according to the equation (1). In the third and subsequent processing, the reference output value Vs is corrected by using the determination output value Vs (N) and the determination output value Vs (N−1) according to the equation (1).

  In the bath water heater 1 according to the present disclosure, as shown in FIGS. 4 and 5, the reference voltage value Vx is corrected to a value suitable for determining the presence or absence of water in the bathtub 8. That is, as shown in FIG. 4, when the corresponding value of the reference voltage value Vx is smaller than the first reference value Rt-r on the line L22, the reference voltage value Vx is a voltage that is increased stepwise in step S130. It is corrected using the value. Thus, the reference voltage value Vx is corrected to the reference voltage value Vy as shown in FIG. Even if the driving force of the pump 33 is relatively low, the presence or absence of water in the bathtub 8 can be determined using the reference voltage value by correcting the reference voltage value to be high. That is, the individual difference in the driving force of the pump 33 can be covered by the correction of the reference voltage value.

  In the bath water heater 1 according to the present disclosure, as shown in FIGS. 3 and 8, the reference voltage value Vx is corrected to a value suitable for determining the presence or absence of water in the bathtub 8. That is, as shown in FIG. 3, in the line L12, when the corresponding value of the reference voltage value Vx is larger than the second reference value Rt + r, the reference voltage value Vx is the voltage value stepped down in step S130. Corrected. Thus, the reference voltage value Vx is corrected to the reference voltage value Vz as shown in FIG. Even when the driving force of the pump 33 is relatively high, the presence or absence of water in the bathtub 8 can be determined using the reference voltage value by correcting the reference voltage value to be low. That is, the individual difference in the driving force of the pump 33 can be covered by the correction of the reference voltage value.

  In one aspect of the embodiment described above, the CPU 101 determines that the rotation speed of the bath pump when the reference driving force (reference voltage value Vi) is supplied to the bath pump is equal to or higher than the reference rotation speed (reference value Rt-r). It is an example of the judgment means comprised so that it may judge that there is no water flow of a recirculation circuit when it is.

  In another aspect of the embodiment described above, the CPU 101 determines a range in which the number of rotations of the bath pump when the reference driving force (reference voltage value Vi) is supplied to the bath pump (reference value Rt−). It is an example of a determination unit configured to determine that there is no water flow through the recirculation circuit when r is within the reference value Rt + r). In this example, the CPU 101 may determine that there is water in the recirculation circuit when the number of rotations of the bath pump is lower than the above range.

The determination means is configured such that when the rotation speed of the bath pump exceeds the determination rotation speed (determination rotation speed R ₀ ) when the reference driving force is supplied to the bath pump, the rotation speed of the bath pump is the reference rotation speed. The determination driving force (determination output value Vs) as described above is specified, and the reference driving force is corrected using the determination driving force.

The determination rotational speed (determination rotational speed R ₀ ) is an example of the determination rotational speed that is lower than the reference rotational speed (reference value Rt−r).

The determination rotational speed (determination rotational speed R ₀ ) is outside the predetermined range (reference value Rt−r to reference value Rt + r) for the rotational speed of the bath pump, and is lower than that range. It is an example.

  The determination means specifies the first determination drive force (determination output value Vs (1)) and the second determination drive force (determination output value Vs (2)) as the determination drive force. Also good. The determination means may be configured to set an average value of the first determination driving force and the second determination driving force as the corrected reference driving force.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Bath hot water supply apparatus, 8 bathtubs, 30 Combustion burner, 31 Fan, 32 Heat exchanger, 33 Pump, 100 Controller, 101 CPU, 102 Memory | storage device, 103 Interface, 104 Operation part, 330 Power supply circuit, 331 Rotation detection part, 1021 Reference driving force storage unit, 1022 data storage unit.

Claims (5)

A recirculation circuit that circulates hot water in the bathtub via a heat exchanger for reheating,
A bath pump provided in the recirculation circuit,
Judging means configured to judge that there is no water passing through the recirculation circuit when the rotation speed of the bath pump when a reference driving force is supplied to the bath pump is equal to or higher than a reference rotation speed; Prepared,
The determination means includes
When the rotation speed of the bath pump exceeds a determination rotation speed lower than the reference rotation speed when the reference driving force is supplied to the bath pump, the rotation speed of the bath pump is equal to or higher than the reference rotation speed. Identify the driving force for judgment
A bath apparatus configured to correct the reference driving force using the determination driving force. A recirculation circuit that circulates hot water in the bathtub via a heat exchanger for reheating,
A bath pump provided in the recirculation circuit,
Determination means configured to determine that there is no water flow in the recirculation circuit when the number of rotations of the bath pump when a reference driving force is supplied to the bath pump is within a predetermined range. And
The determination means includes
When the reference pumping force is supplied to the bath pump, when the rotational speed of the bath pump is outside the range and exceeds the rotational speed for determination lower than the range, the rotational speed of the bath pump is within the range. Identify the driving force for judgment inside,
A bath apparatus configured to correct the reference driving force using the determination driving force. The determination means includes
As the determination driving force, a first determination driving force and a second determination driving force are specified,
The bath apparatus according to claim 1 or 2, wherein an average value of the first determination driving force and the second determination driving force is set as the corrected reference driving force. .   The determination means is configured to determine whether or not water flows through the recirculation circuit using the corrected reference driving force after the correction of the reference driving force. The bath apparatus of any one of Claims 1-3.   5. The determination unit according to claim 1, wherein the determination unit is configured to specify the determination drive force while changing the drive force supplied to the bath pump in a stepwise manner. The bath apparatus as described.

Images