JP2005265369A - Hot-water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent hot water having high temperature from coming out when using in hot-water supply at next time accompanying a stop position of a hot-water mixing valve after use in hot-water supply. <P>SOLUTION: This hot-water storage type water heater is provided with the hot-water supply mixing valve 22 for mixing hot water from a hot-water storage tank 11 with water from a water supply pipe to adjust to predetermined temperature, a hot-water supply temperature sensor 23 for detecting temperature of mixed hot water, a hot-water supply circuit having a hot-water supply flow rate sensor 22 for detecting mixed hot-water flow rate, and a controller 41 for controlling temperature of hot water in the hot-water supply circuit in accordance with demanded temperature. The controller is provided with a time counting means for counting predetermined time when the hot-water supply flow rate sensor 22 generates a signal for OFF from ON. When the time counting means counts the predetermined time, opening of the hot-water supply mixing valve 21 is changed to predetermined opening. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to hot water supply control using a mixing valve of a hot water heater.

In recent years, in addition to the general hot water supply operation to a kitchen etc., various functions are also required for the bath apparatus. For example, an automatic bath filling function that automatically drops hot water to the set water level, a chasing function that raises the bath water to the desired temperature, and a slimming function that drops a certain amount of city water into the bath to lower the bath water temperature There is an additional hot water function that drops a certain amount of heated hot water into the bath. Therefore, in order to correspond to the various functions described above, two hot water supply piping circuits are provided as a hot water supply path from the hot water storage tank, so that general hot water supply and bath hot water supply can be used simultaneously (see Patent Document 1). .
JP 2002-48409 A

  In the conventional configuration, the control of the mixing valve is maintained at the opening set just before the stop after the use is stopped in order to eliminate the temperature change at the time of re-heating the hot water supply alone or in the simultaneous use of the hot water supply and the bath hot water filling. However, when the remaining hot water temperature in the hot water storage tank is gradually lowered or the hot water supply circuit is discharged until the hot water runs out, the hot water mixing valve is adjusted to open in the hot water side fully open direction to satisfy the required temperature. . After that, when the hot water storage tank is heated and the hot water supply is resumed while the hot water tank is filled with hot water, the hot water mixing valve is set to the hot water side fully open position at the beginning of the mixed hot water temperature control. The hot water is discharged in a near state, and unexpectedly hot water is discharged from the faucet for a short time. Furthermore, if the hot water mixing valve fails or the hot water flow sensor fails after the hot water tank is boiled in the above situation, the hot water mixing valve cannot be controlled and is kept close to the fully open position on the hot water side. The water is continuously discharged and dangerous.

  In addition, when the hot water supply circuit and bath hot water filling circuit are used at the same time, if the hot water mixing valve adjusts the opening in the hot water side full open direction according to the bath hot water filling condition and stops using hot water in that state, the hot water mixing valve opens. It will remain stopped at a position near the hot water side fully open. Thereafter, when hot water supply is used alone, the hot water mixing valve is discharged in a state close to the hot water side full open position at the initial stage when the mixed hot water temperature control is started, and it is unexpected for a short time from the faucet. Hot water is poured out. In addition, if the hot water mixing valve fails or the hot water flow rate sensor fails in the above situation, the hot water mixing valve cannot be controlled and is maintained in a state close to the hot water side fully open position, and hot water in the hot water storage tank is continuously discharged into the hot water. It is dangerous.

  As described above, the hot water supply mixing valve operates under conditions other than the set conditions, which may lead to unexpected results such as high temperature hot water.

  Therefore, the present invention provides a hot water supply in advance even when the hot water tank is heated up or when the hot water filling circuit or the hot water supply flow sensor is out of order after the bath hot water filling circuit is used at the same time. An object of the present invention is to provide a safe hot water storage type water heater that prevents the unexpected high temperature hot water by operating the mixing valve to the safe side.

  In order to solve the above-described conventional problems, a hot water storage type hot water heater of the present invention includes a hot water mixing valve that mixes hot water from a hot water storage tank and water from a water supply pipe and adjusts the temperature to a predetermined temperature, and hot water supply that detects the mixed hot water temperature. A temperature sensor, a hot water supply circuit having a hot water supply flow rate sensor for detecting a mixed flow rate, and a control device for controlling the hot water temperature of the hot water supply circuit according to a required temperature. A time measuring means for measuring a predetermined time when an OFF signal is generated is provided, and when the time measuring means measures the predetermined time, the hot water supply mixing valve is changed to a predetermined opening degree.

  As a result, it is possible to prevent hot hot water at the time of next use of hot water accompanying the stop position of the hot water mixing valve after use of hot water. For example, when the hot water supply tank is used alone until the hot water storage tank runs out, the hot water mixing valve adjusts the opening in the hot water side fully open direction to satisfy the required temperature, and when hot water use is stopped in that state, the hot water mixing valve The degree of opening remains stopped at a position near the hot water side fully open. After that, when the hot water storage tank is heated up and the hot water use is resumed while hot water is filled in the hot water storage tank, the hot water mixing valve is set to the hot water side fully open position at the beginning of the mixed hot water temperature control. The hot water is discharged in a near state, and unexpectedly hot water is discharged from the faucet for a short time. Therefore, the present invention changes the opening of the hot water mixing valve when a predetermined time elapses after the hot water supply flow sensor generates an ON to OFF signal, that is, after the hot water supply is stopped, Regardless of the temperature of the hot water supplied, unexpected hot water is prevented from being discharged from the tap.

  In addition to the hot water supply circuit having a hot water supply mixing valve, the hot water storage type water heater of the present invention mixes hot water from a hot water storage tank and water from a water supply pipe to adjust the bath hot water temperature, Bath hot water temperature sensor for detecting bath hot water temperature, bath flow sensor for detecting bath hot water flow rate, bath hot water circuit having a pouring valve, and the hot water supply circuit and bath hot water depending on the required temperature A control device for controlling the hot water temperature of the circuit, wherein the control device is configured to use hot water supply when simultaneous use of the hot water supply circuit and the bath hot water circuit occurs and the conditions for simultaneous use satisfy a predetermined condition. When the flow rate sensor generates a signal from ON to OFF, the hot water supply mixing valve is changed to a predetermined opening degree.

  As a result, when the hot water supply circuit and the bath hot water filling circuit are used at the same time, the hot water mixing valve adjusts the opening in the hot water side fully open direction according to the bath hot water filling conditions, and when the hot water supply is stopped in that state, The opening remains stopped at a position near the hot water side fully open. Thereafter, when hot water supply is used alone, the hot water mixing valve is discharged in a state close to the hot water side full open position at the initial stage when the mixed hot water temperature control is started, and it is unexpected for a short time from the faucet. Hot water is poured out. In view of the above, when the hot water supply circuit and the bath hot water circuit are used at the same time and the conditions at the time of simultaneous use satisfy a predetermined condition, the hot water supply flow rate sensor generates a signal from ON to OFF. The opening of the mixing valve is changed so that unexpected hot water is not discharged from the faucet at the next use of hot water supply.

  The hot water storage water heater of the present invention is safe by changing the opening of the hot water mixing valve to the water side after stopping the use of hot water so that unexpected hot water is not discharged from the faucet at the next use of hot water. Can provide an easy-to-use hot water storage water heater.

  A first aspect of the present invention is a hot water mixing valve that mixes hot water from a hot water storage tank and water from a water supply pipe to adjust to a predetermined temperature, a hot water temperature sensor that detects the mixed hot water temperature, and a hot water flow rate sensor that detects a mixed flow rate. And a control device that controls the hot water temperature of the hot water supply circuit according to a required temperature, and the control device counts a predetermined time when the hot water flow sensor generates a signal from ON to OFF. A time measuring means is provided, and when the time measuring means times a predetermined time, the hot water supply mixing valve is changed to a predetermined opening degree. High temperature hot water can be prevented in advance.

  In the second aspect of the invention, the control device changes the hot water supply mixing valve so that the water side opening degree is opened when the time measuring means counts the predetermined time. The hot water supply can be prevented in advance by supplying the hot water mixed appropriately even if hot water is supplied from the hot water storage tank when the hot water supply is used next time.

  According to a third aspect of the present invention, when the opening degree of the hot water supply mixing valve is opened to the hot water side from the preset opening degree, the time counting means returns the hot water supply mixing valve to the set opening degree when a predetermined time is counted. Changed the stop position according to the opening state of the hot water mixing valve after the stop of hot water use, so that unnecessary stop hot water mixing valve stop position change control is not performed, and it was set at the next use of hot water supply Mixing hot water control based on the required temperature is possible, improving usability and preventing hot hot water from being used the next time when hot water is used when the hot water mixing valve stops when the hot water usage is stopped. can do.

  According to a fourth aspect of the present invention, the control device changes the hot water supply mixing valve so that the water side opening degree is opened for a predetermined time when the time measuring means counts the predetermined time. When the temperature is opened to the water side for a predetermined period of time, the hot water supply is prevented in advance by supplying moderately mixed hot water even when hot water is supplied from the hot water storage tank the next time hot water is used. It can be realized with a simple circuit.

  A fifth aspect of the invention relates to a hot water mixing valve for mixing hot water from a hot water storage tank and water from a water supply pipe to adjust to a predetermined temperature, a hot water temperature sensor for detecting the mixed hot water temperature, and a hot water flow rate sensor for detecting a mixed flow rate. A hot water supply circuit having a hot water supply circuit, a bath mixing valve for adjusting the hot water temperature of the hot water bath by mixing hot water from the hot water storage tank and water from the hot water supply pipe, a hot water temperature sensor for detecting the hot water temperature of the hot water bath, and a bath A bath flow sensor for detecting a hot water flow rate, a bath hot water circuit having a pouring valve, and a control device for controlling the hot water temperature of the hot water supply circuit and the bath hot water circuit according to a required temperature, the control When the hot water supply circuit and the bath hot water circuit are used at the same time and the conditions for simultaneous use satisfy a predetermined condition, the hot water supply flow sensor generates a signal from ON to OFF. To change the valve to a predetermined opening If the hot water supply circuit and the bath hot water circuit are used at the same time and the conditions for simultaneous use satisfy the predetermined conditions, the hot water supply flow rate sensor generates a signal from ON to OFF. By changing the degree of opening so that unexpected high-temperature water is not discharged from the faucet at the next use of hot water supply, a safe and easy-to-use hot water storage water heater can be provided.

  According to a sixth aspect of the present invention, when the controller uses the hot water supply circuit and the bath hot water circuit simultaneously, the hot water flow rate sensor is not higher than a predetermined flow rate, the bath flow sensor is not lower than a predetermined flow rate, and the bath hot water temperature sensor is not lower than a predetermined temperature for a predetermined time. When the hot water flow sensor generates an ON to OFF signal, the hot water mixing valve is changed to a predetermined opening so that a large amount of hot water in the hot water storage tank flows through the bath hot water filling circuit. When the hot water supply is used under various conditions, it is possible to prevent high-temperature hot water from the faucet when the hot water supply alone is used next time by correcting the opening of the hot water supply mixing valve after the hot water supply is stopped.

  In the seventh aspect of the invention, when the hot water supply flow sensor generates a signal from ON to OFF, the control device changes the hot water mixing valve so that the water side opening degree is opened. When used at the same time under conditions that cause a lot of flow, even if hot water is supplied from the hot water storage tank the next time hot water is used alone by stopping the hot water supply mixing valve after it stops using the hot water, By supplying appropriately mixed hot water, high temperature hot water can be prevented in advance.

  In an eighth aspect of the invention, the control device changes the hot water supply mixing valve to return to the set opening when the opening of the hot water supply mixing valve is open to the hot water side from the preset opening. When the hot water storage tank is used at the same time under conditions where a lot of hot water flows in the circuit, the stop position is changed according to the opening state of the hot water mixing valve after hot water use is stopped. The hot water mixing control based on the required temperature set at the next use of hot water supply is possible without performing stop position change control, improving usability and the hot water mixing valve stop position when hot water use is stopped is near the hot water side fully open position. It is possible to prevent high temperature hot water when the hot water supply is used next time when it is stopped.

  According to a ninth aspect of the invention, when the hot water supply flow sensor generates a signal from ON to OFF, the control device changes the hot water mixing valve so that the water side opening degree is opened for a predetermined time. When used at the same time under conditions where a lot of water flows, after the hot water supply is stopped, the hot water mixing valve is opened for a predetermined period of time and then opened to the water side. Even if hot water is supplied, it is possible to prevent hot hot hot water by supplying hot water that is appropriately mixed, and it can be realized with a simple circuit.

  In a tenth aspect of the invention, when the control device determines that a preset condition is satisfied during simultaneous use of the hot water supply circuit and the bath hot water circuit, and if any one of the conditions is off for a predetermined time, Even if the hot water flow sensor generates a signal from ON to OFF, it does not change the opening of the hot water mixing valve. It is used at the same time under the condition that a lot of hot water in the hot water tank flows through the bath hot water filling circuit. Even if the usage conditions are changed in the middle, the opening of the hot water mixing valve is not corrected after the hot water supply is stopped, and unnecessary control is omitted, ensuring the ease of use at the next use, The control configuration can be simplified.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 is a configuration diagram of a hot water storage type hot water heater according to a first embodiment of the present invention, and FIG. 2 is a control block diagram.

  In the figure, 10 is a water supply pipe, 11 is a hot water storage tank having the water supply pipe 10 connected to the bottom, and 12 is a pressure reducing valve for reducing the water pressure of the hot water storage tank 11. The hot water storage tank 11 is provided with an electric heater 13 for heating a large volume of water in the hot water storage tank 11. In this embodiment, the electric heater 13 is used as the heating means. However, the heat pump unit is used as the heating means, and the water taken in from the lower part of the hot water storage tank 11 is heated by the heat pump unit, and then the hot water storage tank. It is also possible to use a hot water storage type hot water heater that is supplied from the top of 11 and stores hot water in a stacked state.

  A hot water supply pipe 14 is connected to the upper part of the hot water storage tank 11 and is connected to the hot water side of the hot water supply mixing valve 21 for hot water supply. The water side of the hot water supply mixing valve 21 is connected to the water supply pipe 10 via the pressure reducing valve 12. An outlet of the hot water supply mixing valve 21 is connected to a predetermined place, for example, a hot water outlet of a kitchen or a bathroom, through a hot water supply flow rate sensor 22. Reference numeral 23 denotes a hot water supply temperature sensor that detects the hot water temperature of the hot water supply mixing valve 21. When hot water is discharged from the hot water supply pipe 14, water is supplied from the water supply pipe 10 into the hot water storage tank 11. At this time, the hot water is stored in the hot water storage tank 11 in a state where the hot water is separated into the upper part and the water is separated into the lower part due to the difference in specific gravity. Further, the electric heater 13 heats the water in the hot water storage tank to boil the entire hot water storage tank 11.

  The control device 41 includes a control unit 41a and a timer unit 41b. The control means 41 a receives the flow rate from the hot water supply flow rate sensor 22, the hot water supply temperature from the hot water supply temperature sensor 23, and the hot water supply temperature setting from the kitchen remote control 24, and the output is connected to the hot water supply mixing valve 21. When the flow rate from the hot water flow rate sensor 22 is input and the hot water flow rate is switched from ON to OFF, the timer unit 41b counts a predetermined time set in advance and outputs a count-up signal to the control unit 41a. When turned ON, the count is stopped and the count value is reset.

  When the hot water supply port is opened and a detection signal is input from the hot water supply flow rate sensor 22, the controller 41 operates the hot water supply mixing valve 21 so that the hot water supply temperature is set to the hot water supply temperature set by the remote controller 24. Is controlled. Further, when the hot water supply is stopped, the control device 41 stops the temperature control operation by the hot water supply mixing valve 21 and stops the operation of the hot water supply mixing valve 21. Thereafter, when the hot water supply is not used for a predetermined time, in the control device 41, the timer means 41b outputs a count-up signal to the control means 41a.

  Next, the operation of the control means 41a will be described with reference to the flowchart of FIG. 3. In process 51, when the hot water supply flow rate sensor 23 detects the opening of the hot water tap, the process proceeds to process 52, and the hot water mixing valve 21 is set to the hot water temperature. The opening degree is controlled so as to be the set temperature set in step, and the process proceeds to step 53. When the hot-water tap is closed, the output of the hot-water supply flow sensor is turned OFF and the process proceeds to processing 53. In process 53, the time-up output of the timer means 41b is determined, and if the time has not expired, the process goes through without processing the hot water supply mixing valve 21. Accordingly, the hot water supply mixing valve 21 is stopped and the opening at the time of hot water supply is maintained. When the timer means 41b has timed up in processing 53, the processing proceeds from processing 53 to processing 54. In the process 54, the hot water supply mixing valve 21 is set to a predetermined opening degree.

  Specifically, the predetermined time of the timer means 41b is a time during which the temperature of the remaining water in the hot water supply pipe 11 is sufficiently cooled after the hot water supply is completed, for example, 1 hour. The predetermined opening degree of the hot water supply mixing valve 21 is set to a hot water supply temperature that does not cause burns when hot water is supplied at the maximum temperature of the hot water storage tank 11 and the maximum temperature of the water supply temperature. For example, when the temperature is 90 ° C., 30 ° C., and 60 ° C., respectively, the hot water temperature does not exceed 60 ° C. if the opening degree of the hot water supply mixing valve is 50% or less. Considering this condition, the remaining hot water temperature of the hot water storage tank 11 is gradually lowered to 60 ° C. due to use of hot water supply or heat radiation, and the set temperature is 45 ° C. When the hot water tap is opened, the control means 41a detects that the hot water has been discharged by a signal from the hot water flow rate sensor 22, and controls the hot water supply mixing valve 21 in a process 52 so that the opening degree is adjusted to a set temperature of 45 ° C. . If the flow rates on the hot water side and the water side are the same, the opening degree is (45 ° C.-15 ° C.) ÷ (60 ° C.-15 ° C.) ≈0.66 as the water side reference, which is 66%. Thereafter, the hot water storage tank 11 is boiled by the electric heater 13 and the temperature of the tank reaches 90 ° C. after several hours. The control means 41a receives the output of the timer means 41b one hour after the completion of hot water supply, and the hot water mixing valve 21 is processed 54. Is set to a predetermined opening (for example, 50%). Therefore, even if the hot water tap is opened after the completion of boiling, the opening degree of the hot water supply mixing valve 21 is 50%, so that (90 ° C.−15 ° C.) × 0.5 + 15 ° C.≈53 ° C. If hot water is supplied, generally 60 ° C or less, there is no worry of getting burned immediately and it will not be unsafe.

  Usually, if it is within a predetermined time, the opening degree of the hot water supply mixing valve remains at the time of the previous hot water supply, and the hot water supply temperature immediately becomes the set temperature. Even if it is longer than the specified time, when the hot water supply starts, the remaining water between the hot water storage tank and the hot water tap is drained, so even if the temperature control of the mixing valve is slightly delayed, whether the remaining water part or the delayed hot water is delayed by the user I don't know.

  Even if the flow sensor fails and the opening of the hot-water tap cannot be detected, the opening degree is safe after a predetermined time, so that unexpected high-temperature water is not discharged and it is safe. Moreover, even if the hot water supply mixing valve suddenly fails and does not operate, if the hot water supply is stopped for a predetermined time before the failure, a safe opening can be achieved.

(Embodiment 2)
FIG. 4 is a flowchart of the control means in the second embodiment of the present invention. The same parts as those described in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

In process 51, when the hot water supply flow sensor 23 detects the opening of the hot water tap, the process proceeds to process 52, and the opening degree of the hot water mixing valve 21 is controlled so that the hot water supply temperature becomes the set temperature set by the kitchen remote controller 24. When the hot-water tap is closed, the output of the hot-water supply flow sensor is turned OFF and the process proceeds to processing 53. In process 53, the time-up output of the timer means 41b is determined, and if the time has not expired, the process goes through without processing the hot water supply mixing valve 21. Accordingly, the hot water supply mixing valve 21 is stopped and the opening at the time of hot water supply is maintained. When the timer means 41b expires in processing 53, the processing proceeds from processing 53 to processing 55. In the process 55, the opening degree of the hot water supply mixing valve 21 is confirmed to determine whether or not the opening degree is equal to or greater than the predetermined opening degree. If it is more than a predetermined opening degree by the process 55, it will progress to the process 54, and in the process 54, the hot water supply mixing valve 21 will be made into a predetermined predetermined opening degree.
Accordingly, the opening degree of the hot water supply mixing valve is checked in the process 55, and if it is a safe opening degree, the hot water supply mixing valve is not moved. Therefore, the useless movement of the hot water supply mixing valve is reduced and the durability is improved. Can be obtained.

(Embodiment 3)
FIG. 5 is a flowchart of the control means in the third embodiment of the present invention. The same parts as those described in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

  In process 51, when the hot water supply flow sensor 23 detects the opening of the hot water tap, the process proceeds to process 52, and the opening degree of the hot water supply mixing valve 21 is controlled so that the hot water supply temperature becomes the set temperature set by the kitchen remote controller 24. When the hot-water tap is closed, the output of the hot-water supply flow sensor is turned OFF and the process proceeds to processing 53. In process 53, the time-up output of the timer means 41b is determined, and if the time has not expired, the process goes through without processing the hot water supply mixing valve 21. Accordingly, the hot water supply mixing valve 21 is stopped and the opening at the time of hot water supply is maintained. When the timer means 41b times out in processing 53, the processing proceeds from processing 53 to processing 56. In the process 56, the hot water supply mixing valve 21 is driven to the water side for a predetermined time.

  Therefore, it is not necessary to check the current angle or determine a predetermined angle, and the same effect as in the first embodiment can be obtained with a simple process.

(Embodiment 4)
FIG. 6 is a configuration diagram of a hot water storage type hot water heater according to a fourth embodiment of the present invention, and FIG. 7 is a control block diagram. The same parts as those described in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

  In FIG. 6, the hot water supply pipe 14 is connected to the hot water side of a hot water supply mixing valve 21 for hot water supply and a bath mixing valve 31 for bath water. The water side of the bath mixing valve 31 is connected to the water supply pipe 10 via the pressure reducing valve 12. The outlet of the bath mixing valve 31 is connected to the bathtub via the bath flow sensor 32 and the pouring valve 34. 33 is a bath hot water temperature sensor that detects the temperature of the hot water of the bath mixing valve 31.

  The control device 42 sets the flow rate from the hot water supply flow rate sensor 22, the hot water supply temperature from the hot water supply temperature sensor 23, the flow rate from the bath flow rate sensor 32, the hot water supply temperature from the hot water supply temperature sensor 34, and the hot water supply temperature from the kitchen remote control 24. The bath set temperature and bath water accumulated flow from the bath remote control 35 are respectively input. The output of the control device 42 is connected to the hot water supply mixing valve 21, the bath mixing valve 31, and the pouring valve 34. When the control device 42 detects that the hot water mixing valve 21 has started hot water supply when the hot water supply port is opened and a detection signal from the hot water supply flow rate sensor 22 is input, the hot water supply temperature is set to the hot water supply temperature set by the remote controller 24. Thus, the hot water mixing valve 21 is driven and controlled. Further, when the hot water supply is stopped, the control device 42 stops the temperature control operation by the hot water supply mixing valve 21 and stops the operation of the hot water supply mixing valve 21.

  When the hot water is poured into the bathtub, the control device 42 opens the hot water supply valve 34 to start the hot water hot water for the bathtub when the warm water hot water operation is performed by a signal from the kitchen remote control 24 or the bath remote control 35. The bottom mixing valve 31 is driven and controlled so that the bottom temperature set by the bottom remote control 35 is set. When the detection signals from the bath flow sensor 32 are integrated and the integrated flow set by the bath remote control 35 is reached, the hot water supply valve 34 is closed to complete the bath hot water.

  Next, the operation of the control device 42 will be described with reference to the flow chart of FIG. 8. When bath filling is started and the bath flow rate sensor 32 is turned on in processing 61, the routine proceeds to processing 62, and the temperature of bathing hot water is adjusted through the bath mixing valve 31. The opening degree is controlled so that the set temperature set by the remote controller 35 is reached, and the process proceeds to step 63. When bathing is completed, the output of the bath flow sensor is turned OFF and the process proceeds to processing 63. In process 63, when opening of the hot water tap is detected by the hot water supply flow rate sensor 23, the process proceeds to process 64, the opening degree of the hot water supply mixing valve 21 is controlled so that the hot water temperature becomes the set temperature set by the kitchen remote controller 24, and the process proceeds to process 65. When the hot-water tap is closed, the output of the hot-water supply flow sensor 23 is turned OFF and the process proceeds to processing 72. In process 65, it is determined whether or not the flow sensor 32 is ON / OFF in order to confirm whether or not it is used at the same time. When it is ON, the process proceeds to process 66 and the condition determination process for simultaneous use is performed. Exit. Processes 66, 67, and 68 sequentially determine the condition of the hot water, and proceed to process 69 only when the bath flow rate is equal to or higher than the predetermined flow rate, the bath flow rate is equal to or higher than the predetermined temperature, and the hot water supply flow rate is equal to or lower than the predetermined flow rate. Go to 71. In process 69, the time is measured, and if it is not less than the predetermined time, the process proceeds to process 70. In process 70, the flag KR is set to 1, and if it is within the predetermined time, the process is exited. In the process 71, the time is measured, and if it is equal to or longer than the predetermined time, the process proceeds to the process 72. If it is within the predetermined time in the process 71, the process is left as it is. In process 73, it is determined whether KR is 1 or 0. If KR = 0, the process exits. If KR = 1, the process proceeds to process 74, and the hot water mixing valve 21 is set to a predetermined opening degree. move on. Therefore, the flag KR is set to 1 in processing 70 when the hot water supply flow rate sensor detects the flow rate below the predetermined flow rate, the bath flow rate sensor detects the flow rate above the predetermined flow rate, and the bath hot water temperature sensor detects the temperature above the predetermined temperature for a predetermined time. When the hot water flow sensor generates an ON to OFF signal, the value of the flag KR is 1 in process 73, so that the hot water mixing valve can be changed to a predetermined opening in process 74, and the hot water in the hot water storage tank is added to the bath hot water circuit. When hot water is used at the same time under conditions where hot water flows, by correcting the opening of the hot water supply mixing valve after stopping the use of hot water supply, it is possible to prevent hot hot water from the faucet at the next use of hot water supply alone. If it is determined that a preset condition is satisfied and one of the above conditions is not satisfied in the process 71 for a predetermined time, the flag KR is set to 0 in the process 72, so that the hot water supply flow rate sensor is turned on. Even if an OFF signal is generated, the process exits in the determination of process 73, and the opening degree of the hot water supply mixing valve is not changed. Therefore, even if the hot water storage tank flows at a high temperature in the bath hot water circuit and is used at the same time, if the operating conditions are changed during the process, the hot water mixing valve opening is not corrected after the hot water supply is stopped. By omitting unnecessary control, it is possible to simplify the control configuration while ensuring ease of use at the next use.

  About the predetermined opening degree of the hot water supply mixing valve 21, if it is 50% or less similarly to Embodiment 1, it will not exceed 60 degreeC.

(Embodiment 5)
FIG. 9 is a flowchart of the control means in the fifth embodiment of the present invention. The same parts as those described in the fourth embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

  In process 73, it is determined whether KR is 1 or 0. If KR = 0, the process exits, and if KR = 1, the process proceeds to process 75, where the opening degree of the hot water supply mixing valve 21 is confirmed and whether it is equal to or greater than the predetermined opening degree. If it is equal to or less than the predetermined opening degree, the process proceeds to the hot water mixing valve 21 without processing. If the opening degree is equal to or larger than the predetermined opening degree, the process proceeds to step 74 to set the hot water mixing valve 21 to the predetermined predetermined opening degree. . Therefore, since the opening degree of the hot water mixing valve is checked in the process 75 and the opening degree is not safe, the hot water mixing valve is not moved, the useless movement of the hot water mixing valve is reduced, the durability is improved, and the same effect as in the fourth embodiment is obtained. Can be obtained.

(Embodiment 6)
FIG. 10 is a flowchart of the control means in the sixth embodiment of the present invention. The same parts as those described in the fourth embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

  In process 73, it is determined whether KR is 1 or 0. If KR = 0, the process exits, and if KR = 1, the process proceeds to process 76, and the hot water supply mixing valve 21 is driven to the water side for a predetermined time.

  Therefore, it is not necessary to check the current angle or determine a predetermined angle, and the same effect as in the fourth embodiment can be obtained with a simple process.

  As described above, the hot water heater according to the present invention changes the opening of the hot water mixing valve to the water side after stopping the use of hot water so that unexpected hot water is not discharged from the faucet at the next use of hot water. By doing so, it provides a hot water storage hot water heater that is safe and easy to use, and can be applied to all devices that control hot water temperature using a mixing valve.

The block diagram of the hot water storage type water heater in Embodiment 1 of this invention Control block diagram of the hot water heater Control flow chart of the hot water heater Control flow chart of hot water storage type water heater in Embodiment 2 of the present invention Control flow chart of hot water storage type water heater in Embodiment 3 of the present invention The block diagram of the hot water storage type water heater in Embodiment 4 of this invention Control block diagram of the hot water heater Control flow chart of the hot water heater Control flow chart of hot water storage type water heater in Embodiment 5 of the present invention Control flow chart of hot water storage type water heater in Embodiment 6 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Hot water storage tank 21 Hot water supply mixing valve 22 Hot water supply flow rate sensor 23 Hot water supply temperature sensor 31 Bath mixing valve 32 Bath flow rate sensor 33 Bath hot water filling temperature sensor 34 Pouring valve 41 Control device 41a Control means 41b Timer means 42 Control device

Claims (10)

A hot water mixing valve for mixing hot water from a hot water storage tank and water from a water supply pipe to adjust the temperature to a predetermined temperature, a hot water temperature sensor for detecting the mixed hot water temperature, and a hot water supply circuit having a hot water flow rate sensor for detecting a mixed flow rate A control device for controlling the hot water temperature of the hot water supply circuit according to the required temperature, the control device is provided with a time measuring means for measuring a predetermined time when the hot water flow rate sensor generates a signal of OFF from ON, A hot water storage type water heater in which the hot water mixing valve is changed to a predetermined opening when the time measuring means measures a predetermined time. The hot water storage type water heater according to claim 1, wherein the control device changes the hot water supply mixing valve so that the water side opening degree is opened when the time measuring means measures a predetermined time. The control device changes the hot water mixing valve so that the hot water mixing valve returns to the set opening degree when the timing means measures a predetermined time when the opening degree of the hot water mixing valve is opened to the hot water side from the preset opening degree. Or the hot water storage type water heater of 2 description. 2. The hot water storage type hot water heater according to claim 1, wherein the control device changes the hot water supply mixing valve so that the water side opening degree is opened for a predetermined time when the time measuring means measures a predetermined time. A hot water mixing valve for mixing hot water from a hot water storage tank and water from a water supply pipe to adjust the temperature to a predetermined temperature, a hot water temperature sensor for detecting the mixed hot water temperature, and a hot water supply circuit having a hot water flow rate sensor for detecting a mixed flow rate , A bath mixing valve that adjusts the temperature of the hot water bath by mixing hot water from the hot water tank and water from the water supply pipe, a hot water temperature sensor that detects the hot water temperature of the bath, and a hot water flow rate of the bath A bath flow rate sensor, a bath filling circuit having a pouring valve, and a control device for controlling the hot water temperature of the hot water supply circuit and the bath filling circuit according to a required temperature, the control device comprising: When simultaneous use of the hot water bathing circuit occurs and the conditions at the time of simultaneous use satisfy a predetermined condition, when the hot water flow sensor generates a signal from ON to OFF, the hot water mixing valve is opened at a predetermined opening degree. Hot water storage hot water changed to . When the controller uses the hot water supply circuit and the bath hot water circuit simultaneously, the hot water flow sensor detects the flow rate below the specified flow rate, the bath flow rate sensor detects the flow rate above the specified flow rate, and the hot water bath temperature sensor detects the hot water bath temperature sensor above the specified temperature for a predetermined time. The hot water storage type hot water heater according to claim 5, wherein when the hot water supply flow rate sensor generates a signal from ON to OFF, the hot water supply mixing valve is changed to a predetermined opening degree. The hot water storage hot water heater according to claim 5 or 6, wherein the control device changes the hot water supply mixing valve so that the water side opening degree is opened when the hot water flow rate sensor generates a signal from ON to OFF. The hot water storage water heater according to claim 5 or 6, wherein the control device changes the hot water supply mixing valve to return to the set opening when the opening of the hot water supply mixing valve is opened to the hot water side from a predetermined opening. . The hot water storage water heater according to claim 5 or 6, wherein when the hot water supply flow sensor generates a signal from ON to OFF, the control device changes the hot water supply mixing valve to open the water side opening for a predetermined time. When it is determined that the preset condition is satisfied when the hot water supply circuit and the bath hot water circuit are used at the same time, the control device turns on the hot water supply flow rate sensor when one of the above conditions is removed for a predetermined time. The hot water storage type hot water heater according to claim 5 or 6, wherein the opening degree of the hot water supply mixing valve is not changed even if an OFF signal is generated.

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