JP2003161520A - Abnormality diagnostic method of bath return temperature sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abnormality diagnostic method of bath return temperature sensor which detects the abnormality of a bath return temperature sensor during heating of bath water, and prevents the bath water from being heated to a high temperature. <P>SOLUTION: In a forced circulating type bath heater 15 for transporting the bath water 12 in a bathtub 11 to a heating means 20 through a bath return passage 21 by a circulating pump 22 and transporting the heated bath water 12 to the bathtub 11 through a bath outward passage 25, when the rise of temperature of the bath water 12 measured by the bath return temperature sensor 23 provided in the bath return passage 21 is less than a prescribed temperature after a preset judgment time during the operation of the forced circulating type bath heater 15, the operation of the heating means 20 and the circulating pump 22 is interrupted, and the temperature difference between the temperature of the bath water 12 measured by a bath outward temperature sensor 26 provided in the bath outward passage 25 and the temperature of the bath water 12 measured by the bath return temperature sensor 23 is determined after the lapse of a preset waiting time. When the temperature difference exceeds a preset reference temperature difference, the abnormality of the bath return temperature sensor 23 is diagnosed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for diagnosing an abnormality in a bath return temperature sensor, which is carried out during operation of a forced circulation type bath hook device.

[0002]

2. Description of the Related Art It is repeated that bath water sucked by a circulation pump reaches a heating means through a bath return path to heat the bath water and the heated bath water is discharged into a bath through a bath outgoing path. In the forced circulation type bath hook device that heats the bath water in the bathtub to a predetermined temperature, a bath return temperature sensor is provided in the bath return path, and a bath leaving temperature sensor is provided in the bath going path. The output signal from each temperature sensor is
The temperature control unit is input to the temperature control unit of the control unit that controls the operation of the heating unit.For example, when each temperature sensor is disconnected and the output signal is not input to the temperature control unit, the temperature control unit controls the temperature. It was judged that the sensor was abnormal, and the temperature sensor abnormality was displayed on the operation panel of the forced circulation bath device.

[0003]

However, when the temperature sensor is deteriorated, short-circuited, or is mis-wired, a signal is output from the temperature sensor and input to the temperature control unit. This means that the temperature sensor cannot detect any abnormality in the temperature sensor. Especially when the output value of the bath return temperature sensor is fixed or hardly changes below the boiling temperature set when heating the bath water, the temperature control unit cannot accurately detect the temperature of the bath water. It becomes a state. In this case, the safety means provided in the forced circulation bath cooker device operates to stop the operation of the heating means, but heating by the heating means is continued until the safety means operates and the temperature of the bath water becomes high. Will end up. The present invention has been made in view of such circumstances, and provides a method for diagnosing an abnormality in a bath return temperature sensor that can detect an abnormality in the bath return temperature sensor during heating of the bath water and prevent the bath water from being heated to a high temperature. The purpose is to do.

[0004]

According to a first aspect of the present invention, there is provided a bath return temperature sensor abnormality diagnosing method, wherein a circulating pump transports bath water from a bath to a heating means through a bath return route.
In a method for diagnosing an abnormality of a bath return temperature sensor provided in the bath return path of a forced circulation type bath kettle device that transports the heated bath water to the bathtub through a bath outward route, during the operation of the forced circulation type bath kettle device. If the temperature rise of the bath water measured by the bath return temperature sensor is below a predetermined temperature after a preset judgment time, the operation of the heating means and the circulation pump is interrupted, and a preset waiting time elapses. After that, the temperature difference is set in advance by obtaining the temperature difference between the temperature of the bath water measured by the bath-going temperature sensor provided in the bath-going path and the temperature of the bath water measured by the bath-return temperature sensor. If the temperature difference exceeds the reference temperature difference, the bath return temperature sensor is diagnosed as abnormal and the operation of the forced circulation type bath device is terminated, and if the temperature difference is less than the reference temperature difference, the wind Returning to determine the temperature sensor to be normal resume operation of the heating means and the circulation pump.

During operation of the forced circulation bath device, the bath water in the bathtub sucked by the circulation pump reaches the heating means through the bath return path and is heated to a high temperature (for example,
20 to 30 against the bath water temperature when sucked from the bathtub
Bath water having a temperature rise of ℃) is repeatedly discharged into the bathtub through the bathing path, and the average temperature of the bathwater in the bathtub rises. Therefore, the temperature of the bath water measured by the bath return temperature sensor provided in the bath return path is
It rises with the lapse of the operating time of the forced circulation bath device. The temperature rise per unit time at this time is the amount of heat generated by the heating means per unit time, the amount of bath water circulated by the circulation pump per unit time, the temperature of the bath water flowing into the heating means, and the heat transfer coefficient in the heating means. Since it can be estimated from the above, the bath water temperature after a predetermined time has elapsed can be predicted. Therefore, a judgment time is set in order to confirm the rise in the bath water temperature, and the temperature of the bath water measured by the bath return temperature sensor after the judgment time has passed is compared with the bath water temperature after the predicted judgment time has passed. Therefore, it is possible to determine whether the heating by the heating unit is normally performed.

Here, when the amount of heat generated per unit time in the heating means and the amount of bath water per unit time circulated by the circulation pump are normally controlled, the temperature is measured by the bath return temperature sensor after the determination time. If the temperature of the bath water is lower than the predicted temperature, that is, the temperature of the bath water measured by the bath return temperature sensor after the elapse of the determination time has reached the predetermined temperature (determined as the predicted temperature of the bath water after the elapse of the determination time If it is less than the difference from the temperature of the bath water at the time of the starting point),
It can be determined that the bath return temperature sensor is highly likely to be abnormal. Here, the determination time can be 3 minutes or more, and the predetermined temperature corresponding to the determination time is 0.6.
It becomes ~ 1.4 ° C. The judgment time is 3 minutes or more is 3
This is because if the time is less than a minute, the temperature rise of the bath water is small, and there is not always a clear difference between the predicted temperature of the bath water after the judgment time has passed and the temperature of the bath water at the time when the judgment time has started. . The specific determination time depends on the amount of heat generated by the heating means and the capacity of the bath, so it must be individually determined.

When it is determined that the bath return temperature sensor is likely to be abnormal, the operation of the heating means and the circulation pump is interrupted. Even if the heating means and the circulation pump are stopped, the heating of the bath water occurs immediately after the stop due to the residual heat of the heating means, but the heating also decreases with the passage of time. And since the bath water circulates between the bath and the heating means by natural convection, the temperature of the bath water measured by the bath-going temperature sensor provided in the bath-going route and the bath-return temperature sensor provided in the bath-going route. The temperature of the bath water measured in step 1 gradually approaches. And from the structure of the bath return path, the bath return path, and the heating means, how much the temperature of the bath water measured by the bath-going temperature sensor and the temperature of the bath water measured by the bath-return temperature sensor are measured by the effect of natural convection. It is possible to estimate whether it changes at the changing speed of. Therefore, after the preset waiting time,
It is possible to predict the upper limit and the lower limit of how many times the bath water temperature measured by the bath-going temperature sensor and the bath water temperature measured by the bath-return temperature sensor become, respectively.

Therefore, the temperature difference between the temperature of the bath water measured by the bath-outgoing temperature sensor and the temperature of the bath water measured by the bath-return temperature sensor after the waiting time elapses is the upper and lower limits of each temperature. It will be less than the temperature difference determined by. Here, assuming that the maximum temperature difference determined from the upper limit and the lower limit of each temperature is the reference temperature difference, when natural convection normally occurs, the actually obtained temperature difference is less than or equal to the reference temperature difference. Therefore,
If the temperature difference between the bath water temperature measured by the bath-going temperature sensor and the bath water temperature measured by the bath-return temperature sensor after the waiting time is less than the reference temperature difference, the bath water temperature will be The bath return temperature sensor can be diagnosed to be normal, as it is considered to be measured normally. At this time, the heating means and the circulation pump are restarted. On the other hand, the reference temperature that can be predicted after the waiting time is the temperature difference between the temperature of the bath water measured by the bath outgoing temperature sensor after the waiting time and the temperature of the bath water measured by the bath returning temperature sensor. If the difference is exceeded, it is considered that the temperature of the bath water is not normally measured, and the bath return temperature sensor can be diagnosed as abnormal.
At this time, since the controlled heating cannot be performed by the heating means, the operation of the forced circulation bath device is terminated. Here, the waiting time may be, for example, 20 to 30 minutes, and the reference temperature difference corresponding to the waiting time of 20 to 30 minutes is 7 to 3 ° C. The waiting time is set to 20 minutes or more because the effect of the residual heat of the heating means cannot be removed by the natural convection in less than 20 minutes. In addition, the reason why the waiting time is 30 minutes or less is that even if the waiting time is set to exceed 30 minutes, the change in the temperature of the bath-going temperature sensor and the temperature of the bath-returning temperature sensor are both small, and there is a difference in temperature. This is because it will not significantly affect the changes.

A method for diagnosing a bath return temperature sensor according to a second aspect of the present invention, which is in accordance with the above object, transports bath water in a bathtub to a heating means through a bath return route by means of a circulation pump, and heats the bath water to leave the bath route. In the method for diagnosing an abnormality in the bath return temperature sensor provided in the bath return path of the forced circulation type bath kettle device that is transported to the bathtub, the bath is operated after the preset determination time during the operation of the forced circulation type bath kettle device. When the temperature rise of the bath water measured by the return temperature sensor is less than the predetermined temperature, the operation of the heating means is interrupted, and the preset waiting time elapses while the circulation pump is operating for the preset pump drive time. After that, the temperature difference between the temperature of the bath water measured by the bath-going temperature sensor provided in the bath-going route and the temperature of the bath water measured by the bath-return temperature sensor is calculated, and When the temperature difference exceeds a preset reference temperature difference, the bath return temperature sensor is diagnosed as abnormal, and the operation of the forced circulation type bath cooker device is terminated, and when the temperature difference is less than or equal to the reference temperature difference, When the bath return temperature sensor is judged to be normal, the operation of the heating means and the circulation pump is restarted.

When it is determined that the bath return temperature sensor is likely to be abnormal, the operation of the heating means is interrupted, and the circulation pump is operated for a preset drive time, for example, 30 seconds, and then interrupted. By operating the circulation pump, the bath water is forcedly circulated between the bath and the heating means, so that the residual heat of the heating means can be removed in a short time. As a result, if a preset waiting time, for example, 30 seconds to 1 minute elapses after the operation of the heating means is interrupted, the temperature change of the bath water temperature measured by the bath-going temperature sensor provided on the bath-going route is changed with time. Then, the time change of the temperature of the bath water measured by the bath return temperature sensor provided in the bath return path becomes small. Therefore, when the temperature difference between the bath water temperature measured by the bath-outgoing temperature sensor and the bath water temperature measured by the bath-return temperature sensor is obtained, the time change of the temperature difference also becomes small. Therefore, the abnormality of the bath return temperature sensor can be diagnosed by comparing this temperature difference with the reference temperature difference.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. FIG. 1 is a block diagram showing the overall configuration of bath equipment to which the abnormality diagnosing method for bath return temperature sensors according to the first and second embodiments of the present invention is applied, and FIG. 2 is the first embodiment of the present invention. It is a flowchart explaining the abnormality diagnostic method of the bath return temperature sensor which concerns on a form. As shown in FIG. 1, a bath facility 10 to which an abnormality diagnosis method for a bath return temperature sensor according to the first and second embodiments of the present invention is applied,
It has a bathtub 11, a bathroom operation unit 13 that issues a command for a set temperature when heating the bathwater 12 in the bathtub 11, and a bath kettle device 14 that heats the bathwater 12 in response to a command from the bathroom operation unit 13. ing. In addition, the bath kettle device 14 uses the bath water 1 of the bathtub 11.
Forced circulation type bath kettle 15 for heating 2 and bathroom operation part 13
And a control means 16 for controlling the operation of the forced circulation type bath kettle 15 by storing the command from. Hereinafter, these will be described in detail.

As shown in FIG. 1, the forced circulation type bath kettle 15 has a circulation passage 19 formed on the side wall of the bath 11 for connecting a suction inlet 17 and a discharge outlet 18 of the bath water, and a circulation passage 1
It has the heat exchanger 20 which is an example of the heating means connected to 9. Here, the suction port 17 and the discharge port 18 are respectively formed on the same side wall of the bathtub 11, for example, and the suction port 17 is provided on the bottom side of the bathtub 11 with respect to the discharge port 18. A circulation pump 22 is provided in the bath return path 21 that connects the suction port 17 and the inlet side of the heat exchange unit 28 of the heat exchanger 20.
Is provided, and the bath return path 2 on the upstream side of the circulation pump 22 is provided.
1, a bath return thermistor 23, which is an example of a bath return temperature sensor that measures the temperature of the bath water 12 sucked by the circulation pump 22 from the suction port 17, and goes to the inlet side of the heat exchange unit 28 of the heat exchanger 20. A water flow switch 24 for detecting the flowing water of the bath water 12 is provided. Here, as the circulation pump 22, a volute type pump or a cascade type pump is used. As the water flow switch 24, a paddle type, electromagnetic type, ultrasonic type, Kalman flow type, thermistor type, water wheel type, impeller type, or differential pressure type detector can be used. In addition, a bath-going temperature sensor that measures the temperature of the bath water 12 heated by the heat exchanger 20 is provided in the bath-going path 25 that connects the outlet side of the heat exchange unit 28 of the heat exchanger 20 and the discharge port 18. A bath-going thermistor 26, which is an example, is provided. In addition to the thermistor, a resistance temperature detector or a thermocouple can be used as each of the temperature sensors for returning to and from the bath.

The heat exchanger 20 has a gas combustion mechanism 27 which is an example of a heat source, and a heat exchange section 28 which heats the bath water 12 with the heat generated by the gas combustion mechanism 27. The gas combustion mechanism 27 is provided with a gas burner 30 having a gas ignition unit 29, and a fuel supply pipe 31 for supplying a fuel gas to the gas burner 30. Further, in the fuel supply pipe 31,
A solenoid valve 32, which is an example of an on-off valve that supplies and stops the fuel gas, and a solenoid proportional valve 33, which is an example of a gas flow rate adjusting mechanism that adjusts the flow rate of the fuel gas supplied from the solenoid valve 32.
Is provided. With this configuration,
The bath water 12 stored in the bathtub 11 is driven by the circulation pump 22 to be sucked from the suction port 17 and introduced into the heat exchanger 20 via the bath return path 21, and heated based on the measurement result of the bath return thermistor 23. You can do it. Further, the heated bath water 12 is made to flow in the bath-going path 25, the temperature is measured by the bath-going thermistor 26, and then the discharge port 18 is provided.
It can be discharged into the bathtub 11 more.

In the bathroom operation unit 13, a set temperature for heating the bath water 12 is inputted, or a new set temperature is inputted for changing the set temperature while the forced circulation type bath kettle 15 is in operation. A function for transmitting to the control means 16 and a communication function for exchanging communication signals for performing a cooperative operation with the control means 16 are provided. The bathroom operation unit 13 having such a function can be configured using, for example, a microcomputer. The control means 16 has a communication function for performing communication for cooperation with the bathroom operation unit 13, and the bathroom operation unit 13
An operation control unit is provided for receiving an operation command signal from the control unit and controlling the operation of the forced circulation type bath kettle 15. And
The operation control unit is provided with a thermistor abnormality diagnosis function for diagnosing an abnormality of the bath return thermistor 23 while heating the bath water 12. Here, the control means 16 is composed of, for example, a microcomputer, and each detection signal of the bath return thermistor 23, the bath leaving thermistor 26, and the water flow switch 24 is input. A program for controlling the operation and operation of the circulation pump 22, the gas ignition unit 29, the solenoid valve 32, and the solenoid proportional valve 33 is stored in the control means 16 in accordance with various preset operation contents. Therefore, when the operation command signal related to the set temperature is input from the bathroom operation unit 13 to the control means 16, the circulation pump is generated based on the operation command signal and the detection signals of the bath return thermistor 23, the bath going thermistor 26, and the water flow switch 24. 22, the gas ignition unit 29, the solenoid valve 32, and the solenoid proportional valve 33 are operated and operated to start the operation of the forced circulation bathtub 15. Further, the operation of the forced circulation type bath kettle 15 is started and the operation of the thermistor abnormality diagnosis function is started, and during the operation control of the forced circulation type bath kettle 15, the abnormality diagnosis of the bath return thermistor 23 is always performed.

Next, a method for diagnosing an abnormality in the bath return temperature sensor according to the first embodiment of the present invention will be described with reference to FIGS.
Will be described in detail. The control means 16 is the bathroom operation unit 1.
When the instruction of the set temperature for heating the bath water 12 and the operation instruction signal are received from 3 to start the operation of the forced circulation type bath kettle 15 (S1), the control means 16 activates the thermistor abnormality diagnosis function, The temperature of the bath water 12 measured by the bath return thermistor 23 (hereinafter referred to as bath return temperature) is set as the reference temperature of the bath, and the determination time (for example, 5 minutes) stored in advance in the control means 16 is read. Is performed (S2). Next, the bath return temperature is compared with the set temperature set by the bathroom operation unit 13, and if the bath return temperature is equal to or higher than the set temperature (S3), it is determined that the boiling of the bath water 12 has ended, and the forced circulation system is used. The boiling operation of the bath kettle 15 is terminated (normal termination) (S4). On the other hand, when the bath return temperature is lower than the set temperature set by the bathroom operation unit 13 (S3), the operation of the forced circulation bath hook 15 is continued by a preprogrammed method until the determination time elapses (S3).
5). At this time, the bath return temperature measured by the bath return thermistor 23 is constantly compared with the set temperature, and when the bath return temperature is equal to or higher than the set temperature (S3), the forced circulation type bath kettle 15 is boiled. The raising operation is finished (S4).

When the bath return temperature is lower than the set temperature and the operation of the forced circulation type bath kettle 15 has passed the determination time (S
5) Bath return temperature and comparison temperature (bath reference temperature + 1 ° C
Temperature) is compared (S6). Here, the temperature that is 1 ° C. higher than the reference temperature of the bath is set as the comparison temperature after the operation of the forced circulation type bath kettle 15 is continued for 5 minutes because of the capacity of the forced circulation type bath kettle 15 used. This is because it has been confirmed in advance that the bath return temperature of 1 always rises by 1 ° C. or more from the temperature when the operation of the forced circulation bath kettle 15 is started (reference temperature of the bath). Therefore, if the bath return temperature is higher than the bath reference temperature by 1 ° C or more,
The bath return thermistor 23 can normally measure the bath return temperature, that is, the bath return thermistor 23 can be diagnosed as normal, and the first stage heating is completed and the second stage heating is performed (S2).

Before the heating of the second stage is started, the bath return temperature measured at the end of the heating of the first stage is set as the reference temperature of the bath and stored in the control means 16 at the determination time. The judgment time is read (S2).
In the heating of the second stage, when the bath return thermistor 23 is normal, the operations of S2, S3, and S5 are performed, and when the bath return temperature becomes equal to or higher than the set temperature (S3), the forced circulation bathtub 15 The boiling operation of is finished (S4). If the bath return temperature is below the set temperature even after the second stage heating is completed, the third stage heating is performed. If the bath return temperature is below the set temperature even after the third stage heating is completed, the fourth stage heating is performed. Like heating, heating is repeated until the bath return temperature reaches or exceeds the set temperature.

If the bath return temperature <bath reference temperature + 1 ° C. even after the judgment time elapses in heating at each stage (S6),
The bath return thermistor 23 diagnoses that the bath return temperature may not be normally measured, and shifts to the process (S7) of performing the thermistor determination. First, the operation of the heat exchanger 20 and the circulation pump 22 is immediately interrupted. Then, after stopping the operation of the heat exchanger 20 and the circulation pump 22, the control means 1
Wait time stored in advance in 6 (for example, 20 minutes)
Is waited for. While waiting, the bath water 12 is naturally convected to the bathtub 11 and the bath return path 21.
→ The heat exchanging section 28 → Bath going route 25 → Bath 11 is circulated. As a result, if both the bath return thermistor 23 and the bath leaving thermistor 26 are normal, the bath return temperature and the temperature of the bath water measured by the bath returning thermistor 26 (hereinafter,
The bath temperature) is gradually approached, and after reaching the waiting time, each reaches a predetermined temperature. Here, each predetermined temperature can be obtained in advance from a characteristic grasping test of the forced circulation type bath kettle 15. Therefore, the temperature difference between the bath-going temperature and the bath-returning temperature after the waiting time is equal to or less than the reference temperature difference determined by the upper limit and the lower limit of each predetermined temperature. Here, the reference temperature difference determined from the upper limit and the lower limit of each predetermined temperature under natural convection conditions with a waiting time of 20 minutes is, for example, 5 ° C. When the temperature difference between the bath-going temperature and the bath-going temperature is 5 ° C. or less, the bath-going temperature and the bath-going temperature could be measured normally by the bath-going thermistor 23 and the bath-going thermistor 26, that is, the bath-going thermistor. 23, the bath-out thermistor 26 is diagnosed to be normal (S8), the operation of the circulation pump 22 and the heat exchanger 20 is restarted, and the heating of the next stage is started (S2).

After the waiting time of 20 minutes, if the temperature difference between the bath return temperature and the bath return temperature exceeds 5 ° C., the bath return temperature and the bath return temperature are respectively the bath return thermistor 2
3. It can be estimated that the temperature is not normally measured by the bath-going thermistor 26, that is, both or one of the bath-return thermistor 23 and the bath-going thermistor 26 is abnormal. Here, the bath-going thermistor 26 is used as a sensor for detecting an overheat abnormality of the heat exchanger 20, and if the heat-exchanger 20 is operable, it can be determined that the bath-going thermistor 26 is functioning normally. Therefore, the heat exchanger 2
Considering that 0 can be operated, when the temperature difference between the bath return temperature and the bath return temperature exceeds 5 ° C. (S8), the temperature is not normally measured by the bath return thermistor 23, that is, the bath return is performed. It is diagnosed that the thermistor 23 is abnormal (S9). In this case, since the bath return temperature cannot be accurately measured, the operation of the forced circulation bath kettle 15 is forcibly terminated (S10).

In the abnormality diagnosing method for the bath return temperature sensor according to the second embodiment of the present invention, the bath return temperature becomes less than the bath reference temperature + 1 ° C. after a preset determination time (for example, 5 minutes). Sometimes, only the operation of the heat exchanger 20 is interrupted, and the circulation pump 22 continues the operation until the preset pump drive time, for example, 30 seconds to 1 minute elapses after the operation of the heat exchanger 20 is interrupted. Is a feature,
Other than this, the method is substantially the same as the method for diagnosing an abnormality in the bath return temperature sensor according to the first embodiment described above. By operating the circulation pump 22 only for a preset pump drive time, the bath water 12 is forcibly forced into the bath water 12 → bath return path 21 → heat exchange section 28 → bath going path 25 → bath 1
1, the influence of the residual heat of the heat exchange section 28 disappears in a short time. As a result, the bath returning temperature and the bath leaving temperature can quickly approach each other and reach the respective predetermined temperatures with a short waiting time. Therefore, the circulation pump 22 is connected to the heat exchanger 20.
If the pump is further operated for the preset pump drive time after the operation is stopped, the waiting time in the thermistor determination can be shortened. However, since the method of determining the thermistor does not change, the description of the method for diagnosing the abnormality of the bath return temperature sensor according to the second embodiment will be omitted. By operating the circulation pump 22 for 30 seconds to 1 minute after the operation of the heat exchanger 20 is interrupted, the waiting time can be set to 30 seconds to 1 minute, for example.

The embodiment of the present invention has been described above.
The present invention is not limited to this embodiment,
For example, the determination time is set to 5 minutes, but it can be set arbitrarily within the range of 3 minutes or more, and the determination time can be changed according to the season such as summer or winter. Also,
The abnormality diagnosis method for the bath return thermistor can be applied to the abnormality diagnosis for the bath return thermistor.

[0022]

In the abnormality diagnosing method for the bath return temperature sensor according to the first aspect of the present invention, the temperature of the bath water measured by the bath return temperature sensor rises after a preset judgment time during the operation of the forced circulation bath device. If the temperature is lower than the predetermined temperature, the operation of the heating means and the circulation pump is interrupted, and after the waiting time set in advance, the bath water temperature and the bath return temperature measured by the bath-going temperature sensor provided in the bath-going route. The temperature difference from the bath water temperature measured by the sensor is calculated, and if the temperature difference exceeds the preset reference temperature difference, the bath return temperature sensor is diagnosed as abnormal and the operation of the forced circulation bath kettle device is terminated. If the temperature difference is less than the reference temperature difference, the bath return temperature sensor is judged to be normal and the operation of the heating means and the circulation pump is restarted. Can diagnose abnormal, it is possible to prevent the tub bath water becomes hot.

In the abnormality diagnosing method for the bath return temperature sensor according to the second aspect, during the operation of the forced circulation type bath cooker,
When the temperature of the bath water measured by the bath return temperature sensor is lower than the predetermined temperature after the preset judgment time, the operation of the heating means is interrupted, and the circulation pump is preset while operating for the preset pump drive time. After the waiting time
The temperature difference between the bath water temperature measured by the bath-going temperature sensor provided in the bath-going path and the bath water temperature measured by the bath-going temperature sensor was found, and the temperature difference exceeded the preset reference temperature difference. In this case, the bath return temperature sensor is diagnosed as abnormal and the operation of the forced circulation type bath heater device is terminated.If the temperature difference is less than the reference temperature difference, the bath return temperature sensor is judged to be normal and the heating means and circulation pump Since the operation is restarted, the residual water of the heating means is quickly removed by forcibly circulating the bath water with the circulation pump, and the bath water temperature measured by the bath-going temperature sensor and the bath return temperature sensor are measured. The temperature of the bath water can be made uniform, and the abnormality of the bath return temperature sensor can be diagnosed in a short time.

[Brief description of drawings]

FIG. 1 is an overall configuration block diagram of bath equipment to which a bath return temperature sensor abnormality diagnosis method according to first and second embodiments of the present invention is applied.

FIG. 2 is a flowchart illustrating a method for diagnosing an abnormality in the bath return temperature sensor according to the first embodiment of the present invention.

[Explanation of symbols]

10: Bath equipment, 11: Bathtub, 12: Bath water, 13: Bathroom operation unit, 14: Bath pot device, 15: Forced circulation bath pot,
16: control means, 17: suction port, 18: discharge port, 1
9: circulation path, 20: heat exchanger, 21: bath return path,
22: Circulation pump, 23: Bath return thermistor, 24:
Water flow switch, 25: bathing path, 26: bathing thermistor, 27: gas combustion mechanism, 28: heat exchange section, 2
9: Gas ignition part, 30: Gas burner, 31: Fuel supply pipe, 32: Solenoid valve, 33: Electromagnetic proportional valve

Claims (2)

[Claims] 1. The bath return path of a forced circulation type bath kettle device in which bath water in a bathtub is transported to a heating means in a bath return path by a circulation pump and the heated bathwater is transported to the bathtub in a bath trip path. In the method for diagnosing an abnormality in the provided bath return temperature sensor, during the operation of the forced circulation type bath heater device, if the temperature rise of the bath water measured by the bath return temperature sensor is less than a predetermined temperature after a preset determination time. In some cases, the operation of the heating means and the circulation pump is interrupted, and after a preset waiting time elapses, the bath water temperature and the bath return temperature measured by the bath-going temperature sensor provided in the bath-going route. The temperature difference from the temperature of the bath water measured by the sensor is obtained, and when the temperature difference exceeds a preset reference temperature difference, the bath return temperature sensor is diagnosed as abnormal and the forced circulation type bath. When the temperature difference is equal to or less than the reference temperature difference, the operation of the hook device is terminated, and the bath return temperature sensor is judged to be normal, and the operation of the heating means and the circulation pump is restarted. Abnormality diagnosis method for temperature sensor. 2. The bath return path of a forced circulation type bath kettle device, in which the bath water in the bathtub is transported to the heating means by the circulation pump in the bath return path and the heated bathwater is transported in the bath return path to the bathtub. In the method for diagnosing an abnormality in the provided bath return temperature sensor, during the operation of the forced circulation type bath heater device, if the temperature rise of the bath water measured by the bath return temperature sensor is less than a predetermined temperature after a preset determination time. In some cases, the operation of the heating means is interrupted, the circulating pump is operated for a preset pump drive time, and after a preset waiting time has elapsed, the temperature measured by a bath-going temperature sensor provided in the bath-going route is measured. Obtaining the temperature difference between the temperature of the bath water and the temperature of the bath water measured by the bath return temperature sensor,
When the temperature difference exceeds a preset reference temperature difference, the bath return temperature sensor is diagnosed as abnormal and the operation of the forced circulation bath cooker device is terminated, and the temperature difference is equal to or less than the reference temperature difference. Is deciding that the bath return temperature sensor is normal and restarts the operation of the heating means and the circulation pump.