JP2018178548A - A hot water tank device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the hot water tank device capable of determining whether or not a necessary amount of water is stored in a tank by a simple configuration.SOLUTION: The hot water tank device has a first temperature sensor provided at a top of the tank and a second temperature sensor provided closer to a heater than the first temperature sensor. Further, the hot water tank device determines that a necessary amount of water is stored in the tank when a temperature difference between a first initial temperature detected by a first temperature sensor before energization and a first determination temperature detected by the first temperature sensor after energizing the heater for a predetermined time is equal to or higher than a first threshold value and the temperature difference between a second initial temperature detected by a second temperature sensor before energization and a second determination temperature detected by the second temperature sensor after energizing the heater for the predetermined time is equal to or higher than a second threshold value larger than the first threshold value.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a hot water tank apparatus.

  Conventionally, as a hot water tank apparatus of this type, a hot water tank, a heater for making the water in the hot water tank warm, and a water level in the hot water tank are detected to supply water into the hot water tank when the water level does not reach a certain level. There has been proposed one having a float switch for keeping the water level at a certain level or more (see, for example, Patent Document 1). In this hot water tank apparatus, when the water level in the hot water tank does not reach a certain level, the heater is not turned on until the water is supplied into the hot water tank, thereby preventing the dry operation.

  Also proposed is one having a heater flange formed of a heat conductive material and inserted into the side wall of the hot water tank, and a temperature sensor having a sensor flange inserted into the side wall of the hot water tank (See, for example, Patent Document 2). The heater is fitted such that the heater flange is in contact with the sensor flange of the temperature sensor, and when the temperature of the water in the hot water chamber can not be measured favorably as when the hot water chamber of the hot water tank is empty, The heat of the heating unit of the above can be transmitted to the sensor unit of the temperature sensor via the heater flange. Thereby, the heat generation of the heating unit can be controlled based on the temperature detected by the temperature sensor, and the excessive heat generation of the heating unit can be suppressed.

JP 2000-213040 A JP, 2010-106603, A

  However, in the hot water tank apparatus described in Patent Document 1, since it is necessary to provide a float switch to prevent the hot air operation, the number of parts is increased, resulting in an increase in cost. In addition, when the device body is tilted, even if there is no water in the tank, the float switch is activated, and there is a possibility that the dry operation can not be prevented. Further, in the hot water tank apparatus described in Patent Document 2, it is necessary to provide a heater flange on the heater, and moreover, high dimensional accuracy is required to enable heat conduction with the sensor unit of the temperature sensor, so the cost of the heater increases. Invite you.

  The hot water tank apparatus according to the present invention has a main object to provide a hot water tank apparatus capable of determining whether a necessary amount of water is stored in a tank with a simple configuration.

  The hot water tank apparatus of the present invention adopts the following means in order to achieve the above-mentioned main object.

  A hot water tank apparatus according to the present invention comprises a tank for storing water for local cleaning, a heater for heating water stored in the tank, a first temperature sensor provided above the tank, and the first temperature sensor. A second temperature sensor provided closer to the heater than a temperature sensor; and a first initial temperature which is a temperature detected by the first temperature sensor before the heater is energized while the heater is energized for a certain period of time; The temperature difference from the first judgment temperature which is the temperature detected by the first temperature sensor after the energization of the heater is equal to or greater than a first threshold, and is detected by the second temperature sensor before the energization of the heater When a temperature difference between a second initial temperature, which is a temperature, and a second determination temperature, which is a temperature detected by the second temperature sensor after energization of the heater, is equal to or greater than a second threshold that is larger than the first threshold. Said tongue And summarized in that and a control unit determines that the amount of water accumulated required within.

  In the hot water tank apparatus of the present invention, the first temperature sensor is provided at the top of the tank, and the second temperature sensor is provided closer to the heater than the first temperature sensor. The temperature difference between the first initial temperature detected by the first temperature sensor before energization and the first determination temperature detected by the first temperature sensor after energization is equal to or greater than the first threshold. And, the temperature difference between the second initial temperature detected by the second temperature sensor before energization and the second judgment temperature detected by the second temperature sensor after energization is equal to or greater than the second threshold value larger than the first threshold value In this case, it is determined that the necessary amount of water is stored in the tank. As a result, it is possible to determine that the necessary amount of water is stored in the tank with a simple configuration.

  In the hot water tank apparatus according to the present invention, the first determination temperature is the highest temperature among the temperatures detected by the first temperature sensor until the predetermined time elapses after the energization of the heater is stopped. The second determination temperature may be the highest temperature among the temperatures detected by the second temperature sensor until the predetermined time elapses after the energization of the heater is stopped. Good. In this case, the temperature change in the tank due to the heating of the heater can be detected more accurately by the first and second temperature sensors.

  Further, in the hot water tank apparatus of the present invention, the control device is configured such that a temperature difference between the first initial temperature and the first determination temperature is less than a third threshold smaller than the first threshold, and the second When the temperature difference between the initial temperature and the second determination temperature is less than a fourth threshold smaller than the second threshold, it may be determined that the necessary amount of water is not stored in the tank. . In this case, the control device determines whether the temperature difference between the first initial temperature and the first determination temperature is greater than or equal to the third threshold and less than the first threshold, or the second initial temperature and the second determination temperature And the first temperature sensor detects the first initial temperature and the heater after re-energizing the heater when the temperature difference between the first and second threshold values is greater than or equal to the fourth threshold value and less than the second threshold value. A temperature difference between the first judgment temperature and the third judgment temperature, which is the first temperature, and the second judgment temperature and the fourth judgment temperature detected by the second temperature sensor after reenergization of the heater; When the temperature difference is equal to or more than the second threshold value, it is determined that the necessary amount of water is stored in the tank, and the temperature difference between the first initial temperature and the third determination temperature is the first value. The second initial temperature and the fourth judgment temperature If the temperature difference is less than the second threshold value with, or as to determine the amount of water it is not accumulated required the tank. As described above, if it is not possible to determine whether the required amount of water in the tank is stored by only energizing the heater for a certain period of time, the heater is reenergized to perform redetermination. Can be effectively suppressed. Furthermore, in this case, the third determination temperature is the highest temperature among the temperatures detected by the first temperature sensor during a predetermined time after the re-energization of the heater is stopped, The fourth determination temperature may be the highest temperature among temperatures detected by the second temperature sensor after the re-energization of the heater is stopped and the predetermined time elapses. In this case, the temperature change in the tank due to the heating of the heater can be detected more accurately by the first and second temperature sensors.

  In the hot water tank apparatus of the present invention, the first and second temperature sensors may be provided above the heater in the direction of gravity. In this case, if water is stored in the heater, the water heated by the heater moves upward and heat is easily transmitted to the first and second temperature sensors. For this reason, the temperature detected by the first and second temperature sensors can be changed in a relatively short heater energization time, and it is appropriately determined whether the necessary amount of water is stored in the tank. It can be determined.

  Furthermore, in the hot water tank apparatus of the present invention, the control device stops the energization of the heater when the temperature detected by the first temperature sensor exceeds the upper limit temperature while the heater is energized. It is good also as things. In this case, since the abnormal temperature rise of the water in the tank can be monitored using the first temperature sensor, it is not necessary to separately provide a safety device such as a thermostat.

It is a block diagram which shows the outline of a structure of the sanitation washing apparatus 20 containing the warm water tank apparatus 30 of this embodiment. FIG. 5 is an external view showing an appearance of a hot water tank device 30. It is sectional drawing which shows the AA cross section and the BB cross section of the warm water tank apparatus 30 of FIG. It is a flow chart which shows an example of a tank water existence judging routine. It is a flow chart which shows an example of a tank water existence judging routine. It is a flowchart which shows an example of abnormality determination routine.

  A mode for carrying out the present invention will be described.

  FIG. 1 is a block diagram showing the outline of the configuration of the sanitary washing device 20 including the hot water tank device 30 of the present embodiment, FIG. 2 is an external view showing the appearance of the hot water tank device 30, and FIG. FIG. 5 is a cross-sectional view showing a cross section of the hot water tank device 30. 3 (a) shows an AA cross section of the hot water tank apparatus 30 of FIG. 2, and FIG. 3 (b) shows a BB cross section of the hot water tank apparatus 30 of FIG.

  The sanitary washing device 20 is attached to a toilet seat (not shown) and used, and as shown in FIG. 1, to the water stop electromagnetic valve 22 which controls the supply of water from the water supply pipe 12 to the washing water passage 24 and the washing water passage 24 A hot water tank device 30 provided, a nozzle device 40 having a pulsation pump 42, a switching valve 44, and a plurality of nozzles 46 and 48, and a control device 50 for controlling the entire device. In addition, the switching valve 44 switches which of the plurality of nozzles 46 and 48 the cleaning water of the cleaning water flow path 24 on the downstream side of the pulsation pump 42 adjusts the strength of the cleaning as required. . Further, in the present embodiment, the plurality of nozzles 46 and 48 are configured by the nozzle 46 for butt cleaning and the nozzle 48 for bidet.

  As shown in FIGS. 2 and 3, the hot water tank device 30 has a tank 32 having an inlet (not shown) for introducing washing water at the bottom and a discharge port 33 for discharging the washing water at the top, The heater 34 is provided so as to penetrate the side wall in the vicinity of the (bottom portion), and first and second thermistors 36 and 38 as temperature sensors for detecting the temperature inside the tank 32.

  The first thermistor 36 is provided at the top of the tank 32 so as to detect the temperature of water near the outlet 33. The second thermistor 38 is provided in the vicinity of the heater 34 so as to detect the temperature of water near the heater 34. In the present embodiment, as shown in FIG. 3B, the first and second thermistors 36 and 38 are provided above the direction of gravity of the heater 34 (on a plane passing through the heater 34 and along the direction of gravity) .

  The control device 50 is configured as a microcomputer centering on the CPU 52, and includes a ROM 54, a RAM 56, a timer 58, an input / output port (not shown) and the like in addition to the CPU 52. The control device 50 receives temperature signals from the first and second thermistors 36 and 38, switch signals from the hot water switch 59 instructing heating of washing water, and the like via the input port. Further, the control device 50 outputs a drive signal to the water shutoff solenoid valve 22, a drive signal to the heater 34, a drive signal to the pulsation pump 42, a drive signal to the switching valve 44, etc. via the output port. There is.

  Next, the operation of the sanitary washing device 20 of the embodiment configured as described above, in particular, the operation of determining the presence or absence of the necessary amount of water in the tank to prevent the hot water tank device 30 from being exhausted will be described. FIG. 4 is a flowchart showing an example of the tank water presence / absence judgment routine executed by the CPU 52 of the control device 50. This routine is executed when the power switch (not shown) of the sanitary washing device 20 is turned on or when the hot water switch 59 is turned on.

  When the tank water presence / absence judgment routine is executed, the CPU 52 of the control device 50 first inputs the temperatures T1 and T2 from the first and second thermistors 36 and 38 (S100), and the inputted temperatures T1 and T2 respectively The first initial temperature Ti1 and the second initial temperature Ti2 are set (S110). Then, the CPU 52 turns on the heater 34 (S120), waits for a predetermined time t1 (for example, 7 seconds) to elapse (S130), and turns off the heater 34 (S140). That is, the heater 34 is energized for a predetermined time t1.

  Next, the CPU 52 initializes the first judgment temperature Td1 and the second judgment temperature Td2 to the value 0 (S150), and inputs the temperatures T1 and T2 from the first and second thermistors 36 and 38 (S160). The larger one of the inputted temperature T1 and the first judgment temperature Td1 is set to the new first judgment temperature Td1, and the larger one of the inputted temperature T2 and the second judgment temperature Td2 is the new second judgment temperature It sets to Td2 (S170). When S160 and S170 are executed for the first time after the first determination temperature Td1 and the second determination temperature Td2 are initialized in S150, the input temperature T1 is higher than the first determination temperature Td1 (value 0). Since it is determined that the temperature T2 is larger and the input temperature T2 is larger than the second determination temperature Td2 (value 0), the input temperature T1 is set to the new first determination temperature Td1 and input. The temperature T2 is set to a new second determination temperature Td2. Then, the CPU 52 determines whether a predetermined time t2 (for example, 30 seconds) has elapsed since the heater 34 was turned off (S180), and if it is determined that the predetermined time t2 has not elapsed, the process returns to S160. The processes of S160 to S180 are repeated. As described above, during the predetermined time t2 after the heater 34 is turned off, the larger one of the input temperature T1 and the current first determination temperature Td1 is sequentially updated to the new first determination temperature Td1. As a result, the first judgment temperature Td1 becomes the highest temperature among the temperatures detected by the first thermistor 36 until the predetermined time t2 elapses after the heater 34 is turned off. Similarly, the second judgment temperature Td2 turns off the heater 34 by sequentially updating the larger one of the input temperature T2 and the current second judgment temperature Td2 to the new second judgment temperature Td2. Then, the temperature is the highest of the temperatures detected by the second thermistor 38 until the predetermined time t2 elapses. Here, when the water in the tank 32 is full, the water heated by the heater 34 expands and moves upward in the direction of gravity. In the present embodiment, since the first and second thermistors 36 and 38 are both provided above the direction of gravity of the heater 34, even if the time for which the heater 34 is energized (the predetermined time t1) is short. The temperature change due to the heating of the heater 34 can be accurately detected by the first and second thermistors 36 and 38.

  When determining that the predetermined time t2 has elapsed, the CPU 52 subtracts the first initial temperature Ti1 from the first determination temperature Td1 to calculate the temperature difference ΔT1 and subtracts the second initial temperature Ti2 from the second determination temperature Td2 to calculate the temperature difference Calculate ΔT2 (S190). Then, whether or not the temperature difference ΔT1 is equal to or greater than the threshold Tr1 (for example, 1 ° C.) and the temperature difference ΔT2 is equal to or greater than the threshold Tr2 (for example, 2 ° C.) (S200). It is determined whether or not the temperature difference ΔT2 is less than 3 ° C. and less than the threshold value Tr4 (for example, 0.5 ° C.) (S210). Here, the threshold values Tr1 and Tr2 are threshold values for determining that the required amount of water is present (full water) in the tank 32, and the second thermistor 38 is closer to the heater 34 than the first thermistor 36. Therefore, the threshold value Tr2 is set to a value larger than the threshold value Tr1. The thresholds Tr3 and Tr4 are thresholds for determining that there is no required amount of water in the tank 32 (less water), and are set to values smaller than the thresholds Tr1 and Tr2, respectively. Further, since the second thermistor 38 is closer to the heater 34 than the first thermistor 36, the threshold value Tr4 is set to a value larger than the threshold value Tr3.

  When the CPU 52 determines that the temperature difference ΔT1 is the threshold Tr1 or more and the temperature difference ΔT2 is the threshold Tr2 or more, it determines that the tank 32 has a necessary amount of water (full water) (S220). If the determination routine is ended and it is determined that the temperature difference ΔT1 is less than the threshold Tr3 and the temperature difference ΔT2 is less than the threshold Tr4, it is determined that there is no necessary amount of water in the tank 32 (less water) (S230) End the tank water determination routine.

  On the other hand, when the CPU 52 determines that the temperature difference ΔT1 is equal to or greater than the threshold Tr3 and less than the threshold Tr1 or determines that the temperature difference ΔT2 is equal to or greater than the threshold Tr4 and less than the threshold Tr2, It is determined that the presence or absence of water can not be determined, and the same process as the process of S120 to S140 is performed to reenergize the heater 34 for a predetermined time t1 (S240 to S260). Then, after initializing the third determination temperature Td3 and the fourth determination temperature Td4 to the value 0 (S270), the CPU 52 turns off the heater 34 and then the predetermined time t2 elapses, as in the processing of S150 to S180. In the meantime, the temperatures T1 and T2 from the first and second thermistors 36 and 38 are input, and the larger one of the input temperature T1 and the third determination temperature Td3 is set to the new third determination temperature Td3. The processing of S280 to S300 is repeated to set the larger one of the input temperature T2 and the fourth judgment temperature Td4 to the new fourth judgment temperature Td4.

  When determining that the predetermined time t2 has elapsed, the CPU 52 subtracts the first initial temperature Ti1 from the third determination temperature Td3 to calculate the temperature difference ΔT3 and subtracts the second initial temperature Ti2 from the fourth determination temperature Td4 to calculate the temperature difference Calculate ΔT4 (S310). Then, it is determined whether the temperature difference ΔT3 is the threshold Tr1 or more and the temperature difference ΔT4 is the threshold Tr2 or more (S320), and the temperature difference ΔT3 is the threshold Tr1 or more and the temperature difference ΔT4 is the threshold Tr2 or more If it is determined that the required amount of water is in the tank 32 (full water) (S330), the tank water presence / absence determination routine is ended, and the temperature difference .DELTA.T3 is less than the threshold value Tr1, or the temperature difference If it is determined that ΔT4 is less than the threshold value Tr2, it is determined that the required amount of water is not present in the tank 32 (less water) (S340), and the tank water presence / absence determination routine is ended. As described above, when the presence or absence of water in the tank 32 can not be determined only by energizing the heater 34 for a short time (predetermined time t1), the heater 34 is further reenergized for the predetermined time t1 and the tank 32 is required. By creating a condition in which the temperature change is likely to be large if there is a quantity of water, it is possible to suppress an erroneous determination as to the presence or absence of the required quantity of water in the tank 32.

  Next, the abnormality determination operation of the warm water tank device 30 using the first thermistor 36 will be described. FIG. 6 is a flowchart showing an example of the abnormality determination routine executed by the CPU 52 of the control device 50. This routine is repeatedly executed at predetermined time intervals when the heater 34 is energized.

  When the abnormality determination routine is executed, the CPU 52 of the control device 50 inputs the temperature T1 from the first thermistor 36 (S400), and determines whether the input temperature T1 is larger than the upper limit temperature Tmax (S410) ). Here, the upper limit temperature Tmax is a threshold value for determining an abnormal high temperature state in the tank 32, and is set to 50 ° C. or 55 ° C., for example. When the CPU 52 determines that the input temperature T1 is equal to or lower than the upper limit temperature Tmax, the CPU 52 determines that the inside of the tank 32 is normal, and ends the abnormality determination routine. On the other hand, when the CPU 52 determines that the input temperature T1 is larger than the upper limit temperature Tmax, it determines that the inside of the tank 32 is in an abnormally high temperature state, turns off the heater 34 (S420), and ends the abnormality determination routine.

  In the hot water tank device 30 of the embodiment described above, the first thermistor 36 is provided above the tank 34, and the second thermistor 38 is provided closer to the heater 34 than the first thermistor 36. When the power switch or the hot water switch 59 is turned on, the heater 34 is energized for a predetermined time t1, and the initial temperature Ti1 detected by the first thermistor 36 before energization and the first temperature detected by the first thermistor 36 after energization. The temperature difference ΔT1 with the determination temperature Td1 is equal to or greater than the threshold value Tr1, and the temperature between the initial temperature Ti2 detected by the second thermistor 38 before energization and the second determination temperature Td2 detected by the second thermistor 38 after energization When the difference ΔT2 is equal to or larger than the threshold value Tr2 larger than the threshold value Tr1, it is determined that the tank 34 has a necessary amount of water. As a result, it is possible to determine that the necessary amount of water is stored in the tank 34 by a simple configuration using the two thermistors 36 and 38. In addition, since the first and second thermistors 36 and 38 are provided above the direction of gravity of the heater 34, the water temperature by the heating of the heater 34 is short even if the time for which the heater 34 is energized (predetermined time t1) is short. The change can be captured more accurately by the first and second thermistors 36, 38.

  In the warm water tank device 30 according to the embodiment, the temperature difference between the first initial temperature Ti1 and the first determination temperature Td1 is less than the third threshold Tr3 smaller than the first threshold Tr1, and the second initial temperature Ti2 When the temperature difference with the second determination temperature Td2 is less than the fourth threshold value Tr4 smaller than the second threshold value Tr2, it is determined that the necessary amount of water is not stored in the tank 34. Thus, it is possible to determine that the necessary amount of water is not stored in the tank 34 by a simple configuration using the two thermistors 36 and 38. In addition, when the temperature difference ΔT1 is equal to or more than the threshold Tr3 and less than the threshold Tr1, or when the temperature difference ΔT2 is equal to or more than the threshold Tr4 and less than the threshold Tr2, the heater 34 is reenergized for a predetermined time t1 to reactivate the initial temperature Ti1. The temperature difference ΔT3 with the third judgment temperature Td3 detected by the first thermistor 36 after energization is equal to or greater than the threshold Tr1, and the initial temperature Ti2 and the fourth judgment temperature Td4 detected by the second thermistor 38 after reenergization It is determined that the tank 34 has a necessary amount of water when the temperature difference .DELTA.T4 of the second threshold is equal to or greater than the threshold Tr2, and the temperature difference between the first initial temperature Ti1 and the third determination temperature Td3 is less than the first threshold Tr1 Alternatively, when the temperature difference between the second initial temperature Ti2 and the fourth determination temperature Td4 is less than the second threshold Tr2, it is determined that the necessary amount of water is not stored in the tank 34. As a result, when the presence or absence of water in the tank 32 can not be determined only by energizing the heater 34 for a short time (predetermined time t1), the heater 34 is further reenergized for the predetermined time t1 and the necessary amount in the tank 32 is required. If there is water, it is possible to suppress the erroneous determination of the presence or absence of the necessary amount of water in the tank 32 by creating a situation where the temperature change is likely to be large.

  Furthermore, since the warm water tank device 30 according to the embodiment determines an abnormal high temperature state in the tank 32 by the first thermistor 36 provided above the tank 34, it is not necessary to separately provide a safety device such as a thermostat.

  In the embodiment described above, when the temperature difference ΔT1 is equal to or more than the threshold Tr3 and less than the threshold Tr1, or when the temperature difference ΔT2 is equal to or more than the threshold Tr4 and less than the threshold Tr2, the heater 34 is reenergized and the water in the tank 34 is It is assumed that re-determination of presence or absence is performed. However, if the temperature difference ΔT1 is less than the threshold Tr1 or the temperature difference ΔT2 is less than the threshold Tr2, it is determined that the tank 34 does not have the necessary amount of water. It is also possible not to re-determine the presence or absence of water.

  In the embodiment described above, after the heater 34 is energized, the highest temperature among the temperatures detected by the first thermistor 36 is set as the first determination temperature Td1 until the predetermined time t2 elapses after the heater 34 is turned off. The second judgment temperature Td2 is set to the highest temperature among the temperatures detected by the second thermistor 38 until the predetermined time t2 elapses after the heater 34 is turned off. However, the temperature detected by the first thermistor 36 may be set to the first determination temperature Td1 at a timing when a predetermined time has elapsed since the heater 34 was turned off, or the predetermined time has elapsed since the heater 34 was turned off. The temperature detected by the second thermistor 38 may be set to the second determination temperature Td2 at the above timing. The same applies to the third judgment temperature Td3 and the fourth judgment temperature Td4.

  In the embodiment described above, the energization time of the heater 34 and the reenergization time are set to the same time (predetermined time t1), but may be set to different times.

  In the embodiment described above, the first and second thermistors 36 and 38 are provided above the direction of gravity of the heater 34. However, the present invention is not limited to this. What is necessary is to install the second thermistor 38 closer to the heater 34 than the first thermistor 36 and to install it at the upper part. In this case, the first to fourth threshold values Tr1 to Tr4 may be set according to the installation positions of the first thermistor 36 and the second thermistor 38.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the section of “Means for Solving the Problems” will be described. In the embodiment, the tank 32 corresponds to a "tank", the heater 34 corresponds to a "heater", the first thermistor 36 corresponds to a "first temperature sensor", and the second thermistor 38 corresponds to a "second temperature sensor" And the control device 50 corresponds to a "control device".

  In addition, the correspondence of the main elements of the embodiment and the main elements of the invention described in the section of means for solving the problem implements the invention described in the section of the means for solving the problem of the embodiment. The present invention is not limited to the elements of the invention described in the section of “Means for Solving the Problems”, as it is an example for specifically explaining the mode for carrying out the invention. That is, the interpretation of the invention described in the section of the means for solving the problem should be made based on the description of the section, and the embodiment is an embodiment of the invention described in the section of the means for solving the problem. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all by these Examples, In the range which does not deviate from the summary of this invention, it becomes various forms Of course it can be implemented.

  The present invention is applicable to the manufacturing industry of a hot water tank apparatus and the like.

  12 water supply pipe, 20 sanitary washing device, 22 water shut off solenoid valve, 24 washing water flow passage, 30 hot water tank device, 32 tank, 33 discharge port, 34 heater, 36 first thermistor, 38 second thermistor, 40 nozzle device, 42 Pulse pump, 44 switching valves, 46, 48 nozzles, 50 controllers, 52 CPU, 54 ROM, 56 RAM, 58 timers, 59 hot water switch.

Claims (7)

A tank for storing water for local cleaning,
A heater for heating the water stored in the tank;
A first temperature sensor provided at the top of the tank;
A second temperature sensor provided closer to the heater than the first temperature sensor;
The heater is energized for a predetermined time, and a first initial temperature, which is a temperature detected by the first temperature sensor before energization of the heater, and a temperature, which is detected by the first temperature sensor after energization of the heater, is first A second initial temperature, which is a temperature detected by the second temperature sensor before the energization of the heater, and a temperature difference between the determination temperature and the first threshold or more, and the second temperature sensor after the energization of the heater A control device that determines that a necessary amount of water is stored in the tank when a temperature difference between the detected temperature and a second determination temperature is equal to or greater than a second threshold larger than the first threshold. When,
Hot water tank equipment equipped with The hot water tank apparatus according to claim 1, wherein
The first determination temperature is the highest temperature among temperatures detected by the first temperature sensor until a predetermined time elapses after the energization of the heater is stopped,
The second determination temperature is the highest temperature among the temperatures detected by the second temperature sensor after the energization of the heater is stopped and the predetermined time elapses.
Hot water tank equipment. The hot water tank apparatus according to claim 1 or 2, wherein
The control device is configured such that a temperature difference between the first initial temperature and the first determination temperature is less than a third threshold smaller than the first threshold, and the second initial temperature and the second determination temperature When the temperature difference is less than a fourth threshold smaller than the second threshold, it is determined that the required amount of water is not stored in the tank;
Hot water tank equipment. The hot water tank apparatus according to claim 3, wherein
The control device determines whether a temperature difference between the first initial temperature and the first determination temperature is greater than or equal to the third threshold and less than the first threshold, or a temperature between the second initial temperature and the second determination temperature. When the difference is equal to or more than the fourth threshold value and less than the second threshold value, the heater is re-energized for a predetermined time, and the first initial temperature and the temperature detected by the first temperature sensor after re-energization of the heater A temperature difference between a certain third determination temperature and the first threshold value, and a temperature difference between the second initial temperature and a fourth determination temperature detected by the second temperature sensor after reenergization of the heater is When it is the second threshold or more, it is determined that the necessary amount of water is stored in the tank, and the temperature difference between the first initial temperature and the third determination temperature is less than the first threshold The temperature of the second initial temperature and the fourth determination temperature There determines that is less than the second threshold value, the amount of water is not accumulated required the tank,
Hot water tank equipment. The hot water tank apparatus according to claim 4, wherein
The third determination temperature is the highest temperature among temperatures detected by the first temperature sensor during a predetermined time after the re-energization of the heater is stopped,
The fourth determination temperature is the highest temperature among temperatures detected by the second temperature sensor after the re-energization of the heater is stopped and the predetermined time elapses.
Hot water tank equipment. The hot water tank apparatus according to any one of claims 1 to 5, wherein
The first and second temperature sensors are provided above the heater in the direction of gravity.
Hot water tank equipment. The hot water tank apparatus according to any one of claims 1 to 6, wherein
The control device stops energization of the heater when the temperature detected by the first temperature sensor exceeds an upper limit temperature while the heater is energized.
Hot water tank equipment.

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