JP5427131B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus having a function of determining a failure of a hot water supply check valve provided in a hot water supply path.

  In a conventional hot water storage type hot water supply apparatus of this type, as shown in FIG. 3, a hot water storage tank 101 for storing hot water, a heating means 102 for heating the hot water in the hot water storage tank 101, and a lower part of the hot water storage tank 101 are connected. A water supply pipe 103 for supplying clean water to the hot water storage tank 101, a pressure reducing valve 104 provided in the water supply pipe 103 for reducing the pressure of the water supply, a hot water discharge pipe 105 connected to the upper part of the hot water storage tank 101, and an upper part of the hot water storage tank 101 An overpressure relief valve 106 for releasing the overpressure in the hot water storage tank 101, a water supply bypass pipe 107 branched from the water supply pipe 103 downstream from the pressure reducing valve 104, hot water from the hot water outlet pipe 105, and a water supply bypass pipe 107. A mixing valve 108 which mixes clean water into hot water having a set temperature for hot water supply, and a mixing plug 10 provided in a kitchen or a washroom with hot water having a set temperature mixed by the mixing valve 108. A hot water supply pipe 110 to be supplied to the water supply pipe, a mixing tap water supply pipe 111 that branches from the water supply pipe 103 upstream of the pressure reducing valve 104 and supplies clean water to the mixing plug 109, and a water flow in the hot water supply pipe 110 provided in the middle of the hot water supply pipe 110 The hot water flow rate sensor 112 for detecting the hot water and the hot water temperature sensor 113 for detecting the hot water temperature after mixing by the mixing valve 108, and the flow of hot water to the hot water supply pipe 110 (or the hot water side channel in the mixing plug 109) are provided. In some cases, a hot water check valve 114 that shuts off the flow in the opposite direction is provided to prevent a reverse flow toward the hot water storage tank 101 (see, for example, Patent Document 1).

JP 2010-133619 A

  By the way, in the conventional hot water storage type hot water supply device, the hot water check valve 114 may be in a state in which the backflow prevention function does not work due to a foreign object biting in or the valve body of the hot water check valve 114 is damaged, When the mixing plug 109 is opened and hot water is supplied while mixing hot water from the hot water supply pipe 110 and clean water from the mixing plug water supply pipe 111, the supply water pressure of the unplugged mixed water supply pipe 111 is not reduced. Is higher than the hot water supply pressure of the hot water from the hot water supply pipe 110, so that a phenomenon occurs in which the clean water flows backward to the hot water supply pipe 110 side.

  Then, the clean water that flows back through the hot water supply pipe 110 passes through the mixing valve 108 and the hot water discharge pipe 105, is discharged from the overpressure relief valve 106, and depending on the opening degree of the mixing valve 108, the clean water that flows back through the hot water supply pipe 110. A part of the water circulates toward the feed water bypass pipe 107 and flows in from the bottom of the hot water storage tank 101, so that the hot water in the hot water storage tank 101 is pushed out and discharged from the overpressure relief valve 106.

  However, the hot water flow rate sensor 112 provided in the hot water supply pipe 110 only detects the water flow in the hot water supply pipe 110, and when the reverse flow phenomenon occurs, whether the water flow due to normal hot water supply is detected or due to the reverse flow It cannot be judged whether the water current is detected. Further, only tap water is supplied from the mixing tap 109, and the user feels suspicious, but in this state, no error notification is given and a failure of the hot water check valve 114 is not detected and notified.

  In addition, the mixing plug 109 is provided with a handle that can set the hot water supply temperature, and when the temperature is set with the handle, the internal element expands and contracts according to the change in the hot water temperature so that the valve moves to adjust the amount of hot water and water. When a thermostat mixing plug is used, the thermostat mixing plug 109 is always in communication with the hot water side flow path and the water side flow path, and if the backflow prevention function of the hot water check valve 114 stops working, The reverse flow phenomenon may occur even when the mixing plug 109 is closed. However, if the thermostat mixing plug 109 is in the closed state, there is no means for detecting and notifying the failure of the hot water check valve 114. There was a problem that it was impossible to recognize the occurrence, and the hot water continued to be discharged from the overpressure relief valve 106 in vain.

  Therefore, in order to solve the above-mentioned problems, the present invention particularly has a structure as claimed in claim 1 and includes a hot water storage tank for storing hot water, a water supply pipe connected to a lower portion of the hot water storage tank for supplying clean water into the hot water storage tank, A hot water outlet pipe connected to the upper part of the hot water storage tank to take out hot water, a pressure reducing valve provided in the water supply pipe for reducing the water pressure, a water supply bypass pipe branched from the water supply pipe downstream from the pressure reducing valve, A mixing valve that mixes hot water from the hot water pipe and clean water from the water supply bypass pipe, a hot water pipe that supplies hot water mixed by the mixing valve, and the hot water pipe are connected and decompressed. A mixing tap water pipe branched from the water supply pipe on the upstream side of the valve is connected, and the mixing tap capable of mixing and supplying hot water supplied from the hot water supply pipe and clean water supplied from the mixing tap water supply pipe, Water in the hot water pipe provided in the hot water pipe Water flow detecting means for detecting hot water, hot water temperature detecting means for detecting hot water temperature after mixing by the mixing valve, hot water pipe in the hot water pipe or the hot water pipe in the mixing tap communicating with the hot water pipe, A hot water check valve that shuts off the flow in the direction opposite to the flow of the hot water, and a hot water storage control unit that performs feedback control of the opening degree of the mixing valve so that the hot water temperature detected by the hot water temperature detecting means becomes the hot water set temperature. In the hot water storage type hot water supply apparatus provided, when the water flow detection means detects a water flow, the hot water storage control unit performs feedback control of the mixing valve, and the hot water supply temperature detected by the hot water supply temperature detection means during the feedback control. When the temperature is lower than the preset hot water supply temperature for a predetermined time, an error is notified.

  According to a second aspect of the present invention, the hot water storage control unit forces the mixing valve when the hot water temperature detected by the hot water temperature detector is lower than the hot water set temperature for a predetermined time during the feedback control. When the mixing valve is confirmed to be firmly attached and it is determined that the mixing valve is not fixed, it is determined that the hot water check valve has failed.

  According to a third aspect of the present invention, a hot water storage tank for storing hot water, a water supply pipe connected to the lower part of the hot water storage tank for supplying clean water, and a hot water outlet pipe connected to the upper part of the hot water storage tank for taking out hot water. A pressure reducing valve provided in the water supply pipe for reducing the water supply pressure, a water supply bypass pipe branched from the water supply pipe on the downstream side of the pressure reducing valve, hot water from the hot water discharge pipe and the water supply bypass pipe A mixing valve for mixing clean water, a hot water supply pipe for supplying hot water mixed by the mixing valve, and a hot water supply pipe connected to the mixing valve water supply pipe branched from the water supply pipe upstream of the pressure reducing valve. A mixing plug that is connected and can mix hot water supplied from a hot water supply pipe and clean water supplied from a mixing tap water supply pipe and supply hot water, and a water flow and a direction of water flow in the hot water supply pipe provided in the hot water supply pipe. Water flow detection means with backflow detection function to detect In the hot water storage type hot water supply apparatus provided with a hot water check valve that is provided in the hot water flow passage in the mixing tap that communicates with the hot water supply pipe or the hot water supply pipe, and that interrupts the flow in the direction opposite to the flow of hot water, When the water flow detecting means with a back flow detection function continuously detects a back flow for a predetermined time, it is determined that the hot water check valve has failed and an error is notified.

  Moreover, in Claim 4, when the said hot water storage control part determines with the failure of the said hot water supply non-return valve, the opening degree of the said mixing valve shall be the hot water side full open.

  According to the first aspect of the present invention, when the water flow detecting means detects the water flow, the hot water storage control section performs feedback control of the mixing valve, and the hot water temperature detected by the hot water temperature detecting means during the feedback control is a predetermined time. If the temperature is continuously lower than the hot water supply set temperature, it is possible to easily determine that the hot water check valve has failed by determining that the hot water check valve has failed. Therefore, it can be seen that hot water does not come out, and it is possible to quickly respond to repair requests.

  According to claim 2, the hot water storage control unit forcibly drives the mixing valve when the hot water temperature detected by the hot water temperature detecting means is lower than the hot water supply set temperature for a predetermined time during the feedback control. If the mixing valve sticking is confirmed and it is determined that the mixing valve is not sticking, it is determined that the hot water check valve has failed. Can be reliably determined.

  Further, according to claim 3, when the water flow detecting means with the back flow detection function continuously detects the back flow for a predetermined time, it is determined that the hot water check valve has failed, so that It is possible to easily and reliably determine the failure of the hot water check valve, except for the slight backflow phenomenon caused by the It is possible to quickly respond to repair requests.

  According to claim 4, when the hot water storage control unit determines that the hot water check valve is malfunctioning, the opening of the mixing valve is set to the hot water side fully open so that the water flowing back to the water supply bypass pipe side is It is possible to prevent the hot water from being pushed out from the hot water storage tank without wrapping around, and to prevent the hot water stored in the hot water storage tank from being discharged wastefully.

The schematic block diagram of one Embodiment of the hot water storage type hot water supply apparatus of this invention. The flowchart which shows the procedure of the failure determination of the hot-water supply check valve of the same embodiment. The schematic block diagram of other embodiment of the hot water storage type hot water supply apparatus of this invention. The flowchart which shows the procedure of the failure determination of the hot-water supply check valve of other embodiment. The schematic block diagram of the conventional hot water storage type hot-water supply apparatus.

Next, an embodiment of the present invention will be described with reference to FIG.
1 is a hot water storage tank unit having a hot water storage tank 2 for storing hot water, 3 is a heat pump unit as a heating means for heating the hot water in the hot water storage tank 2, 4 is a remote control for remotely operating this hot water storage hot water supply device, and 5 is hot water storage A heating circulation circuit comprising a heating forward pipe 6 connected to the lower part of the tank 2 and a heating return pipe 7 connected to the upper part of the hot water storage tank 2, and connecting the hot water tank 2 and the heat pump unit 3 in a ring shape so that hot water circulates. It is.

  A water supply pipe 8 is connected to the lower part of the hot water storage tank 2 to supply clean water to the hot water storage tank 2, 9 is connected to the upper part of the hot water storage tank 2, and a hot water discharge pipe for taking out hot water from the upper part of the hot water storage tank 2. A pressure reducing valve that is provided in the middle to reduce the feed water pressure to a predetermined pressure, 11 is a feed water temperature sensor that is provided in the middle of the feed water pipe 8 and detects the feed water temperature, and 12 is provided in the upper part of the hot water storage tank 2 in communication with the hot water pipe 9. An overpressure relief valve that relieves overpressure in the hot water storage tank 2.

  13 is a water supply bypass pipe branched from the water supply pipe 8 on the downstream side of the pressure reducing valve 10, and 14 is a hot water supply temperature from the hot water outlet pipe 9 and the depressurized clean water from the water supply bypass pipe 13 to a preset hot water supply temperature. A mixing valve 15 that mixes by adjusting the valve opening of an internal valve body (not shown), 15 is connected to the mixing valve 14 at the start end, and hot water mixed by the mixing valve 14 is mixed with a predetermined hot water supply destination (mixing described later). Hot water supply pipe to be supplied to the stopper.

  Between the start end and the end of the hot water supply pipe 15, the number of rotations of a rotating body such as an impeller is detected by a magnetic conversion element and an electric signal is output, whereby the flow of hot water in the hot water supply pipe 15, that is, the hot water supply pipe 15, a hot water flow rate sensor 16 serving as a water flow detecting means for detecting the water flow in the water 15 and counting the hot water flow rate, a hot water check valve 17 for blocking a flow in the direction opposite to the flow of the hot water, and a mixing valve A hot water supply temperature sensor 18 is provided as hot water supply temperature detection means for detecting the hot water supply temperature. In addition, the hot water supply flow rate sensor 16 of this embodiment shall not have the function to discriminate | determine the flow direction (forward flow or reverse flow) of a water flow.

  19 is connected to the end of the hot water supply pipe 15 and is connected to a mixing tap water supply pipe 20 branched from the water supply pipe 8 on the upstream side of the pressure reducing valve 10, and from the hot water supplied from the hot water supply pipe 15 and the mixing plug water supply pipe 20. This thermostat mixing plug 19 is a thermostatic mixing plug as a mixing tap that can mix and supply hot water that has not been depressurized. The thermostat mixing plug 19 includes a handle (not shown) that can set the hot water supply temperature. When the temperature is set, the internal element expands and contracts in response to changes in the hot water temperature, the valve moves, adjusts the amount of hot water and water, and supplies hot water.It is installed in a suitable place such as a kitchen, washroom or bathroom. It is a thing.

  Reference numeral 21 denotes a hot water storage temperature sensor as a hot water storage temperature sensor detecting means arranged in the vertical direction of the hot water storage tank 2, and how much heat remains in the hot water storage tank 2 according to the temperature information detected by the hot water storage temperature sensor 21. And the temperature distribution in the vertical direction in the hot water storage tank 2 is detected.

  Reference numeral 22 denotes a hot water storage control unit that receives the input of each sensor in the hot water storage tank unit 1 and controls the driving of each actuator. The remote control 4 is connected to the hot water storage control unit 22 wirelessly or by wire, and the user can set an arbitrary hot water supply set temperature or the like. It is something that can be set.

  The heat pump unit 3 includes a compressor 23 that compresses the refrigerant, a water refrigerant heat exchanger 24 that exchanges heat between the high-temperature and high-pressure refrigerant and the hot water in the hot water storage tank 2, and the refrigerant that has passed through the water refrigerant heat exchanger 24. A heat pump circuit 27 in which an electronic expansion valve 25 for depressurization and an air heat exchanger 26 for evaporating a low-temperature and low-pressure refrigerant from the electronic expansion valve 25 are connected in an annular shape by a refrigerant pipe, and a hot water storage tank 2 provided in the heating circulation circuit 5 And a heating circulation pump 28 that circulates hot and cold water, and carbon dioxide is used as a refrigerant in the heat pump circuit 27 to constitute a supercritical heat pump cycle. Reference numeral 29 denotes a heating control unit that receives the output of each sensor in the heat pump unit 3 and controls the drive of each actuator, and is connected to the hot water storage control unit 22 so as to be communicable.

  The remote control 4 includes a hot water supply temperature setting switch 30 for setting a hot water set temperature that is mixed by the mixing valve 14 and supplied from the hot water supply pipe 15 to the thermostat mixing plug 19, and the hot water supply temperature, operation information of the hot water storage type hot water supply device, and the like. A display unit 31 for displaying and a speaker 32 for notifying operation information of the hot water storage hot water supply device by voice are provided.

Next, failure determination of the hot water check valve 17 of the hot water storage type hot water supply apparatus shown in FIG. 1 will be described using the flowchart of FIG.
First, the hot water storage control unit 22 determines whether or not there is a water flow in the hot water supply pipe 15 from a signal detected by the hot water supply flow rate sensor 16 (step S1), the hot water supply flow rate sensor 16 detects the water flow, and the hot water supply flow rate sensor 16 is detected. If it is determined that there is a water flow in the hot water supply pipe 15 from the signal detected by the water temperature, it is confirmed that there is hot water in the hot water storage tank 2 from the temperature detected by the hot water temperature sensor 21, and then the water temperature detected by the water temperature sensor 11 or The mixing valve 14 is controlled to an expected opening obtained from the learning water supply temperature of the previous day, the hot water storage temperature detected by the hot water storage temperature sensor 21, and the hot water supply temperature set by the hot water supply temperature setting switch 30 of the remote controller 4. (Step S2).

  Then, the hot water storage control unit 22 compares the hot water temperature of the hot water flowing through the hot water pipe 15 detected by the hot water temperature sensor 18 with the hot water set temperature set by the hot water temperature setting switch 30 and detects by the hot water temperature sensor 18. The feedback control of the opening degree of the mixing valve 14 is periodically performed so that the hot water temperature becomes the set hot water temperature, and the hot water temperature detected by the hot water temperature sensor 18 continues for a predetermined time, for example, 20 seconds during the feedback control. It is determined whether or not the temperature is lower than the hot water set temperature set by the setting switch 30 (step S3), and it is determined that the hot water temperature detected by the hot water temperature sensor 18 continues to be lower than the hot water set temperature for a predetermined time. In this case, the valve body of the mixing valve 14 is forcibly driven once in the hot water side full open direction and the hot water side fully closed direction to confirm the adhering of the mixing valve 14, and the mixing valve 1 at that time It is determined whether or not the mixing valve 14 is not fixed by detecting the position of the valve body (step S4). If it is determined that the mixing valve 14 is not fixed, the hot water check valve 17 fails and mixing is performed. It is determined that the tap water supplied from the tap water supply pipe 20 to the thermostat mixing plug 19 is flowing back to the hot water supply pipe 15 side, and the fact that the hot water check valve 17 has failed is indicated on the display 31 of the remote controller 4. Error notification is performed by text display or voice from the speaker 32 (step S5), and the opening of the mixing valve 14 is fully opened (step S6).

  If it is determined in step S4 that the mixing valve 14 is stuck, it is determined that the mixing valve 14 has failed, and the content indicating that the mixing valve 14 has failed is displayed on the display unit 31 of the remote controller 4. The error notification is performed by displaying characters or by voice from the speaker 32 (step S7).

  In the above-described failure determination of the hot water check valve 17 of the hot water storage type hot water supply device, the back flow prevention of the hot water check valve 17 is performed while the thermostat mixing plug 19 is opened and hot water is supplied, or while the thermostat mixing plug 19 is closed. Even if the function stops working, the hot water supply flow rate sensor 16 detects the water flow in step S1, and the hot water storage control unit 22 performs hot water supply during feedback control of the opening degree of the mixing valve 14 in step S3. If it is determined that the hot water temperature detected by the temperature sensor 18 is continuously lower than the hot water supply set temperature for a predetermined time, then in step S4, it is checked whether the mixing valve 14 is fixed, and the mixing valve 14 is fixed. If it is determined that the hot water check valve 17 has failed, it is determined that the mixing valve 14 is stuck. It is possible to easily and surely determine that the hot water check valve 17 is faulty without being mistaken for a failure caused by the joint valve 14 being stuck. Further, in step S5, an error is notified of the failure of the hot water check valve 17. Thus, the user knows that hot water does not come out because the hot water check valve 17 is out of order, and can quickly respond to a repair request or the like.

  In addition, when it is determined that the hot water check valve 17 has failed, the hot water storage control unit 22 gives an error notification of the failure of the hot water check valve 17 in step S5. At the same time, the thermostat mixing plug 19, or a message prompting the user to close the water supply main plug (not shown) may be displayed on the display unit 31 of the remote controller 4 by text display or by voice from the speaker 32, whereby the thermostat mixing plug It is possible to reduce discharge of clean water from 19, discharge of clean water flowing back to the hot water supply pipe 15 side and hot water in the hot water storage tank 2 through the overpressure relief valve 12.

  When the hot water storage control unit 22 determines that the hot water check valve 17 has failed, in step S6, the opening of the mixing valve 14 is fully opened, and the hot water pipe 15 is communicated only with the hot water pipe 9. In this way, it is possible to prevent the hot water flowing back from the lower part of the hot water storage tank 2 and the hot water from being pushed out from the hot water storage tank 2 without wrapping around the hot water that has flowed back through the hot water supply pipe 15 to the water supply bypass pipe 13 side. It is possible to suppress the hot water stored in the hot water storage tank 2 from being discharged from the overpressure relief valve 12 in vain.

  Next, another embodiment of the present invention will be described with reference to FIG. 3. In this embodiment, the same parts as those of the above-described embodiment will be denoted by the same reference numerals, a description thereof will be partially omitted, and different configurations. The operation 33 is provided in the hot water supply pipe 15 in place of the hot water supply flow rate sensor 16 of the embodiment described above, and detects the water flow and the direction of the water flow (forward or reverse flow) in the hot water supply pipe 15. A hot water supply flow rate sensor with a backflow detection function as water flow detection means with a backflow detection function for counting the hot water flow rate.

  The hot water supply flow rate sensor 33 with a backflow detection function is provided with two sets of sensor units (not shown) for detecting the rotation of a rotating body such as an impeller, and the output signal of one sensor unit is based on the output signal of the other sensor unit. In order to obtain a signal that is advanced by 90 degrees in electrical angle, the position of one sensor unit is shifted in the rotational direction with respect to the other sensor unit, and the phase of the output signals of both sensor units is compared. This includes a forward / reverse determination unit (not shown) that determines whether the flow is forward or backward depending on whether the phase of the output signal of the sensor unit is advanced.

Next, failure determination of the hot water check valve 17 of the hot water storage type hot water supply apparatus shown in FIG. 3 will be described using the flowchart of FIG.
First, the hot water storage control unit 22 determines whether or not there is a backflow in the hot water supply pipe 15 from the signal detected by the hot water supply flow rate sensor 33 with a backflow detection function (step S8), that is, there is a backflow in the hot water supply pipe 15; When it is determined that the clean water supplied from the mixing tap water supply pipe 20 to the thermostat mixing plug 19 is flowing backward to the hot water supply pipe 15 side, the hot water flow rate with the backflow detection function is detected from the signal detected by the hot water flow rate sensor 33 with the backflow detection function. When it is determined whether the sensor 33 has detected a reverse flow for a predetermined time, for example, 20 seconds (step S9), and when it is determined that the hot water flow rate sensor 33 with a reverse flow detection function has detected the reverse flow for a predetermined time After confirming that there is hot water in the hot water storage tank 2 from the temperature detected by the hot water storage temperature sensor 21, it is determined that the hot water check valve 17 has failed, and the content that the hot water check valve 17 has failed is indicated. , Rimo It performs an error notification from the character display or speaker 32 on the display unit 31 of the emission 4 by voice (step S10), and the opening of the mixing valve 14 is for the hot water side fully open (step S11).

  In the above-described failure determination of the hot water check valve 17 of the hot water storage type hot water supply device, the back flow prevention of the hot water check valve 17 is performed while the thermostat mixing plug 19 is opened and hot water is supplied, or while the thermostat mixing plug 19 is closed. Even when the function stops working, if the hot water storage control unit 22 determines that the hot water flow rate sensor 33 with the back flow detection function continuously detects the back flow for a predetermined time in step S9, the hot water storage control unit 22 determines in step S10. Since it is determined that the hot water check valve 17 has failed, the slight reverse flow phenomenon caused by water hammer due to the rapid closing of the thermostat mixing plug 19 is not mistaken for the failure of the hot water check valve 17, except that A failure of the hot water check valve 17 can be determined easily and reliably. Further, in step S10, the failure of the hot water check valve 17 is reported as an error so that the user can It can be seen that not out hot water in order to check valve 17 is faulty, one in which it is possible to rapidly perform the corresponding repair request and the like.

  In addition, when it is determined that the hot water check valve 17 has failed, the hot water storage control unit 22 notifies the failure of the hot water check valve 17 in step S10. At the same time, the thermostat mixing plug 19, or a message prompting the user to close the water supply main plug (not shown) may be displayed on the display unit 31 of the remote controller 4 by text display or by voice from the speaker 32, whereby the thermostat mixing plug It is possible to reduce discharge of clean water from 19, discharge of clean water flowing back to the hot water supply pipe 15 side and hot water in the hot water storage tank 2 through the overpressure relief valve 12.

  Further, when it is determined that the hot water check valve 17 has failed, the hot water storage control unit 22 opens the mixing valve 14 at the hot water side fully open and communicates the hot water supply pipe 15 only with the hot water discharge pipe 9 in step S11. In this way, it is possible to prevent the hot water flowing back from the lower part of the hot water storage tank 2 and the hot water from being pushed out from the hot water storage tank 2 without wrapping around the hot water that has flowed back through the hot water supply pipe 15 to the water supply bypass pipe 13 side. It is possible to suppress the hot water stored in the hot water storage tank 2 from being discharged from the overpressure relief valve 12 in vain.

  The present invention is not limited to the embodiment and the other embodiments described above, and the hot water check valve 17 is provided in the hot water side flow passage in the thermostat mixing plug 19 that communicates with the hot water pipe 15. Even in this case, the failure determination of the hot water check valve 17 can be similarly performed.

  In one embodiment and other embodiments described above, the heat pump unit 3 is applied as a heating means for heating the hot water in the hot water storage tank 2, but the heating means uses an electric heater, kerosene or gas as fuel. It may be a combustion burner.

  Further, in one embodiment and the other embodiments described above, the thermostat mixing plug 19 is applied as the mixing plug, but the mixing plug may be any one that can supply hot water by mixing hot water and water. A two-handle mixer tap with two handles for water or a single lever mixer tap that uses both hot water and water for one lever may be used.

2 Hot water storage tank 8 Water supply pipe 9 Hot water discharge pipe 10 Pressure reducing valve 13 Water supply bypass pipe 14 Mixing valve 15 Hot water supply pipe 16 Hot water supply flow rate sensor (water flow detection means)
17 Hot water check valve 18 Hot water temperature sensor (hot water temperature detection means)
19 Thermostatic mixing tap (mixing tap)
20 Mixing tap water supply pipe 22 Hot water storage controller

Claims (4)

  A hot water storage tank for storing hot water, a water supply pipe connected to the lower part of the hot water storage tank for supplying clean water, a hot water supply pipe connected to the upper part of the hot water storage tank for taking out hot water, and provided in the water supply pipe A pressure reducing valve for reducing the supplied water pressure, a water supply bypass pipe branched from the water supply pipe on the downstream side of the pressure reducing valve, a high temperature hot water from the hot water discharge pipe, and a mixed water for mixing clean water from the water supply bypass pipe A valve, a hot water supply pipe for supplying hot water mixed by the mixing valve, and the hot water supply pipe are connected, and a mixing tap water supply pipe branched from the water supply pipe is connected upstream from the pressure reducing valve, and supplied from the hot water supply pipe A mixing plug capable of mixing and supplying hot water supplied from a mixing tap water supply pipe, water flow detecting means provided in the hot water supply pipe for detecting a water flow in the hot water supply pipe, and the mixing valve Hot water temperature to detect hot water temperature after mixing A hot water check valve provided in a hot water side passage in the mixing tap communicating with the hot water pipe or the hot water pipe, and a hot water check valve for blocking a flow in a direction opposite to the flow of hot water; and the hot water temperature detecting means. In a hot water storage type hot water supply apparatus comprising a hot water storage control unit that performs feedback control of the opening degree of the mixing valve so that the detected hot water supply temperature becomes a hot water supply set temperature, when the water flow detection means detects a water flow, the hot water storage control unit The feedback control of the mixing valve is performed, and during the feedback control, if the hot water temperature detected by the hot water temperature detecting means continues for a predetermined time and is lower than the hot water supply set temperature, an error is notified. Hot water storage type hot water supply device characterized by   The hot water storage control unit forcibly drives the mixing valve when the hot water temperature detected by the hot water temperature detector is lower than the hot water set temperature for a predetermined time during the feedback control. The hot water storage type hot water supply apparatus according to claim 1, characterized in that when the valve sticking is confirmed and it is determined that the mixing valve is not stuck, it is determined that the hot water check valve has failed.   A hot water storage tank for storing hot water, a water supply pipe connected to the lower part of the hot water storage tank for supplying clean water, a hot water supply pipe connected to the upper part of the hot water storage tank for taking out hot water, and provided in the water supply pipe A pressure reducing valve for reducing the supplied water pressure, a water supply bypass pipe branched from the water supply pipe on the downstream side of the pressure reducing valve, a high temperature hot water from the hot water discharge pipe, and a mixed water for mixing clean water from the water supply bypass pipe A valve, a hot water supply pipe for supplying hot water mixed by the mixing valve, and the hot water supply pipe are connected, and a mixing tap water supply pipe branched from the water supply pipe is connected upstream from the pressure reducing valve, and supplied from the hot water supply pipe A mixing tap capable of mixing and supplying hot water supplied from a mixing tap water supply pipe, and a water flow with a reverse flow detection function provided in the hot water supply pipe for detecting the water flow and the direction of the water flow in the hot water supply pipe Detecting means and the hot water supply pipe or In the hot water storage type hot water supply apparatus provided with a hot water check valve provided in a hot water side flow passage in the mixing tap communicating with the hot water supply pipe and blocking a flow in a direction opposite to the flow of the hot water supply, the water flow with the backflow detection function A hot water storage type hot water supply apparatus characterized by determining that the hot water check valve has failed and detecting an error when the detection means detects a back flow continuously for a predetermined time.   The said hot water storage control part is made to make the opening degree of the said mixing valve into the hot water side full open when it determines with the failure of the said hot water supply non-return valve. Hot water storage system.

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