JP2009150599A - Storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage type water heater which is safe even when a mixing valve for mixing hot water and water fails. <P>SOLUTION: This storage type water heater is provided with a hot water storage tank 1 storing hot water, a hot water delivery pipe 3 delivering high temperature water from an upper part of the hot water storage tank 1, a first water supply pipe 34 for supplying water from a water supply source, a first hot water/water mixing device 4 connecting the first water supply pipe 34 and the hot water delivery pipe 3 and mixing hot water and water, a first hot water supply pipe 31 through which hot water mixed by the first hot water/water mixing device 4 flows, a second hot water/water mixing device 7 connecting the first hot water supply pipe 31 and a second water supply pipe 35 branched from the first water supply pipe 34 and mixing hot water and water, and a second hot water supply pipe 32 through which hot water mixed by the second hot water/water mixing device 7 flows. Even when one of the mixing devices fails by fixing or the like, a hot water temperature can be adjusted by the other mixing device, and thus, the safe storage type water heater can be provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water storage water heater, and more particularly to control of a mixing valve.

  A conventional hot water storage type water heater will be described with reference to FIG. FIG. 2 is a diagram showing a configuration of a conventional hot water storage type water heater. In FIG. 2, the hot water storage water heater includes a heat pump circuit 125 configured by sequentially connecting a compressor 121, a refrigerant water heat exchanger 122, an expansion valve 123, an evaporator 124 that collects atmospheric heat and the like, and a hot water storage tank. 106, a water pump 127, and a water circuit 128 configured by sequentially connecting a refrigerant water heat exchanger 122.

  When a hot water supply heating operation is performed using a heat pump, first, in the evaporator 124, atmospheric heat is collected by a blower fan, and the refrigerant flowing inside is evaporated and gasified. This refrigerant is sucked into the compressor 121, mechanically compressed, and flows into the refrigerant water heat exchanger 122 as a high-temperature and high-pressure refrigerant.

  On the other hand, the water in the lower part of the hot water storage tank 106 is conveyed by the circulating water pump 127 and flows into the refrigerant water heat exchanger 122 where it is heated by the high-temperature and high pressure refrigerant and flows into the upper part of the hot water storage tank 106.

  The refrigerant radiated by the refrigerant water heat exchanger 122 is decompressed by the expansion valve 123 and flows into the evaporator 124. Here, the refrigerant again absorbs heat from atmospheric heat or the like, and is supplied to the next compressor 121.

  On the other hand, the heat pump water heater supplies water to the hot water storage tank 106 and supplies hot water from the hot water storage tank 106 to the outside, and includes a water supply inlet pipe 129, a pressure reducing valve 130, first and second water supply pipes 131 and 132, and hot water. A pipe 133, a mixing valve 104, and a hot water supply outlet pipe 135 are provided.

Water supply to the hot water storage tank 106 is performed via a pressure reducing valve 130 and a first water supply pipe 131 from a water supply inlet pipe 129 connected to a general water supply pipe. Hot water from the hot water storage tank 106 is supplied via the hot water inlet pipe 129, the pressure reducing valve 130, and the second water supply pipe 132, and from the upper part of the hot water storage tank 106 via the hot water supply pipe 133. Hot water is mixed with the mixing valve 104 so as to have an appropriate temperature, and is supplied to the outside through the hot water outlet pipe 135 (see, for example, Patent Document 1).
JP 2006-125655 A

  However, in the configuration of the above-described conventional hot water storage type hot water heater, when the mixing valve 4 is stuck due to full opening of the hot water side or an opening close to the hot water side, the water and hot water in the hot water storage tank mix at an appropriate temperature. Because the mixing ratio of hot water and water at the top of the hot water storage tank cannot be changed, the temperature of the mixed hot water cannot be adjusted and may be supplied to the hot water supply terminal at a high temperature. There was a problem that the safety was lowered.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a hot water storage hot water heater that is highly safe even if a mixing valve that mixes hot water and water fails.

In order to solve the above-mentioned conventional problems, a hot water storage type water heater of the present invention includes a hot water storage tank for storing hot water, a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank, and a first water supply from a water supply source. A first hot water mixing device for connecting hot water with the first hot water mixing tube connected to the first hot water supply tube, the first hot water mixing device, a first hot water supply pipe through which hot water mixed in the first hot water mixing device flows, and the first A second hot water mixing apparatus for connecting hot water and a second water supply pipe branched from the first water supply pipe to mix hot water, and a second hot water pipe for flowing hot water mixed in the second hot water mixing apparatus. As a result, even when one mixing device fails due to sticking or the like, the hot water temperature can be adjusted with the other mixing device, so that a highly safe hot water storage type water heater can be provided.

  The hot water storage type water heater of the present invention can provide a highly safe hot water storage type water heater even if a mixing valve for mixing hot water and water fails.

  A hot water storage hot water heater according to a first aspect of the invention includes a hot water storage tank for storing hot water, a hot water discharge pipe for discharging hot water from an upper portion of the hot water storage tank, a first water supply pipe for supplying water from a water supply source, and the first water supply. A first hot water mixing device for connecting hot water with the pipe and the outlet hot water tube, a first hot water supply pipe through which hot water mixed in the first hot water mixing device flows, the first hot water supply pipe and the first hot water supply pipe A second hot water mixing apparatus for connecting hot water with a second water supply pipe branched from the first hot water mixing apparatus, and a second hot water pipe for flowing hot water mixed in the second hot water mixing apparatus. Even if the device (or the second hot water mixing device) fails, the second hot water mixing device (or the first hot water mixing device) can generate hot water at an appropriate temperature, so that safety can be improved.

  The hot water storage type water heater of the second invention is the first invention for detecting the temperature of hot water flowing through the first hot water supply pipe, and hot water temperature setting means for setting the temperature of hot water supplied to the hot water supply terminal. And the second thermistor for detecting the temperature of the hot water flowing through the second hot water supply pipe, and the temperature detected by the first thermistor is the temperature of the hot water set by the hot water temperature setting means. By controlling the opening degree of the first hot water / water mixing device so that the second hot water / water mixing device is fully open, the normal hot water temperature control is performed only by the first hot water / water mixing device. Since the two hot water mixing devices are not driven, it is possible to prevent the durability of the second hot water mixing device from being deteriorated.

  In the hot water storage type water heater of the third invention, particularly in the second invention, when the first thermistor detects an abnormality, the temperature detected by the second thermistor is set by the hot water temperature setting means. By controlling the opening degree of the second hot water / water mixing device so that the temperature of the hot water becomes the temperature, the first hot water / water mixing device fails and the first thermistor detects an abnormal temperature, or the first thermistor itself When a malfunction is detected and an abnormal temperature is detected, hot water of an appropriate temperature can be supplied to the hot water supply terminal by controlling the opening of the second hot water / water mixing device.

  The hot water storage type water heater of the fourth invention is the first invention for detecting the temperature of hot water flowing through the first hot water supply pipe, and hot water temperature setting means for setting the temperature of hot water supplied to the hot water supply terminal. And the second thermistor for detecting the temperature of the hot water flowing through the second hot water supply pipe, and the temperature detected by the second thermistor is the temperature of the hot water set by the hot water temperature setting means. By controlling the opening degree of the second hot water / water mixing device so that the first hot water / water mixing device is fully open on the hot water side, the normal hot water temperature control is performed only by the second hot water / water mixing device. Since the 1 hot and cold water mixing device is not driven, it is possible to prevent the durability of the first hot water and water mixing device from being deteriorated.

The hot water storage type water heater of the fifth invention is the first invention for detecting the temperature of the hot water flowing through the first hot water supply pipe and the hot water temperature setting means for setting the temperature of the hot water supplied to the hot water supply terminal. And the second thermistor for detecting the temperature of the hot water flowing through the second hot water supply pipe,
The opening of the second hot and cold water mixing device is controlled such that the temperature detected by the thermistor is the temperature of the hot water set by the hot water temperature setting means, and the temperature detected by the first thermistor is Since the temperature of the first hot water / water mixing device is adjusted by controlling the opening of the first hot water / water mixing device so as to be a predetermined temperature higher than the temperature of the hot water set by the hot water temperature setting means, The balance between the pressure of hot water to be mixed by the second hot water / water mixing device and the pressure of water is less likely to be lost, and the difference between the temperature set by the remote controller is less likely to occur and comfortable hot water can be provided.

  The hot water storage water heater of the sixth aspect of the invention is the fourth or fifth aspect of the invention, wherein when the second thermistor detects an abnormality, the opening degree of the first hot water mixing device is controlled to be fully opened on the water side. Thus, even when the second hot water / water mixing device fails, the first hot water / water mixing device is driven fully open on the water side, so that high-temperature hot water is not supplied to the hot water supply terminal, and safety can be improved.

  The hot water storage water heater of the seventh invention is a space saving of the mixing valve, particularly in the first to sixth inventions, by integrating the first hot water mixing device and the second hot water mixing device. This can be realized and maintainability can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a hot water storage type hot water heater according to a first embodiment of the present invention. In FIG. 1, the hot water storage type hot water heater in the present embodiment has a hot water storage tank 1 in which hot water heated by a heat pump, an electric heater or the like is stored. In this embodiment, heating is performed by the heat pump 2 and hot water is stored in the hot water storage tank 1, but the present invention is not limited to this embodiment, and the hot water in the hot water storage tank 1 is heated by an electric heater or the like. Also good.

  The heat pump 2 is configured by sequentially connecting a compressor 21, a water-refrigerant heat exchanger 22, an expansion valve 23, and an evaporator 24 in an annular manner through a refrigerant pipe, and uses carbon dioxide as a refrigerant. Since the pressure exceeds the critical pressure, the water flowing through the water-refrigerant heat exchanger 22 does not condense even if the temperature drops and the temperature drops, and the water-refrigerant heat exchanger causes a temperature difference between the refrigerant and water. Can be easily formed, high-temperature hot water can be obtained, and the heat exchange efficiency can be increased. In addition, since relatively inexpensive and stable carbon dioxide is used for the refrigerant, the product cost can be reduced and the reliability can be improved. In addition, carbon dioxide has an ozone depletion coefficient of zero and a global warming coefficient of about 1/700 of the alternative refrigerant HFC-407C, which is very small.

  In the heat pump 2, the refrigerant is compressed by the compressor 21, the refrigerant discharged from the compressor 21 radiates heat by the water refrigerant heat exchanger 22, is decompressed by the expansion valve 23, and then is heated from the air by the evaporator 24. And is sucked into the compressor 21 again in a gas state. The compressor capacity control and the expansion valve 23 opening control are performed so that the temperature of the discharged refrigerant detected by a thermistor (not shown) provided on the discharge side of the compressor 21 is maintained at a preset temperature. Controlled. The hot water in the hot water storage tank 1 flows into the water / refrigerant heat exchanger 22 through the operation of the water pump 27, exchanges heat with the refrigerant, returns to the hot water storage tank 1, and the hot water storage tank 1 is stacked in a stacked state. Hot water is stored at the top.

  On the other hand, a hot water discharge pipe 3 for pouring hot water in the hot water storage tank 1 is disposed above the hot water storage tank 1, and the first hot water for mixing the hot water of the hot water discharge pipe 3 with the water supplied from the water supply source. It has a mixing device 4.

  Moreover, the 1st hot-water supply apparatus 31 is equipped with the 1st hot-water supply pipe 31 which sends the hot water mixed by the 1st hot-water mixing apparatus 4 to the hot-water supply terminal 40, and the hot water of the 1st hot-water supply pipe 31 and the water supplied from a water supply source are mixed. A second hot water mixing device 7 is provided, and a second hot water supply pipe 32 that sends hot water mixed at an appropriate temperature in the second hot water mixing device 7 to the hot water supply terminal 40 is provided. The first hot water supply pipe 31 is provided with a first thermistor 51 for detecting the temperature of the hot water mixed by the first hot water / water mixing device 4, and the second hot water supply pipe 32 is provided with hot water mixed by the second hot water / water mixing device 7. A second thermistor 52 for detecting the temperature is provided, and a flow rate detection device 53 for detecting the flow rate of hot water to the hot water supply terminal 40 is disposed in the second hot water supply pipe 32.

  In addition, a tank water supply pipe 33 for supplying water from a water supply source is provided at the lower part of the hot water storage tank 1, and a first water supply pipe 34 that branches from the tank water supply pipe 33 and supplies water from the water supply source is a first hot water supply. A second water supply pipe 35 that is connected to the mixing device 4 and further branches off from the first water supply pipe 34 and supplies water from a water supply source is connected to the second hot water mixing apparatus 7.

  Further, it has a remote controller 61 which is a hot water temperature setting means for setting the temperature of hot water supplied to the hot water supply terminal 40, and is configured by a microcomputer and its peripheral circuits so as to be the hot water temperature set by the remote controller 61. The opening degree of the first hot water mixing device 4 and the second hot water mixing device 7 is controlled via the control device 62.

  In addition, the practice arrow shown in FIG. 1 has shown the flow direction of the hot water, and the dotted line arrow has exchanged the signal.

  In the hot water storage water heater configured as described above, the operation and action of the first hot water mixing device and the second hot water mixing device will be described below.

  First, the user sets the temperature of hot water discharged from the hot water supply terminal 40 using the remote controller 61. And the opening degree of a 1st hot water mixing apparatus is changed so that the 1st thermistor 51 may become the temperature of the hot water set with the remote control 61. FIG. On the other hand, the hot water requested by the user is supplied to the hot water supply terminal 40 by fully opening the second hot water / water mixing device to the hot water side.

  However, the first thermistor 51 detects an abnormal temperature different from the temperature set by the remote controller 61 because the first hot water / water mixing device is stuck at the hot water side fully open position or stuck at the hot water side due to some failure. Resulting in. Or even if the 1st thermistor 51 itself fails and the 1st hot water mixing apparatus is normal, temperature control cannot be performed normally.

  Therefore, when an abnormal temperature is detected by the first thermistor 51, the opening degree of the second hot water / water mixing device 7 is changed so that the temperature detected by the second thermistor 52 next becomes the hot water temperature set by the remote controller 61. To do. As a result, even if the first hot water / mixing device 4 cannot be driven due to a failure, the second hot water / water mixing device 7 can be driven, so that the user immediately supplies hot water at a desired temperature from the hot water supply terminal 40. It won't be impossible to get.

  Moreover, although it is possible to produce | generate hot water of desired temperature with the 2nd hot water mixing apparatus 7, if it continues using as it is, if the 2nd hot water mixing apparatus 7 should also break down, it will be high temperature from the hot water supply terminal 40. If the first hot water mixing device 4 fails, the hot water supplied to the hot water supply terminal 40 is mixed by the second hot water mixing device 7 while the remote controller 61 or the like is Although it is possible to continue the hot water supply operation, please contact the service company because there is an abnormal part. ”By displaying to the user that the first hot water mixing device 4 has failed. I can inform you. By displaying in this way, while giving the user a sense of security, it is possible to notify the user that there is an abnormality in the water heater and to prompt the user for repair / maintenance.

  In addition, the hot water supply operation can be performed only for a predetermined period from the time when the first hot water / mixing device 4 breaks down, and the hot water supply operation cannot be performed after the predetermined period has elapsed. "Please contact the company." Before the second hot water and water mixing device 7 breaks down, making the hot water supply operation impossible and preventing hot water from being discharged from the hot water supply terminal 40. Good. By doing in this way, since the hot water supply operation is possible for a predetermined period after the failure of the first hot water / water mixing device 4, hot water requested by the user can be supplied to the hot water supply terminal 40. After the predetermined period has elapsed, the hot water supply operation can be stopped and the safety of the user can be ensured before the second hot water / mixer 7 breaks down.

  Further, when the first hot water / mixing device 4 fails, the second hot water / mixing device 7 is not mixed with the temperature of the hot water set by the remote controller 61 by changing the opening degree of the second hot water / water mixing device 7. It is good also as a structure which prevents high temperature hot water coming out of the hot water supply terminal 40 by driving to the side full open. By driving the second hot water mixing device 7 in this way, only water is supplied to the hot water supply terminal 40, so that the safety of the user can be reliably ensured.

  In addition, when the first hot water / mixing device 4 fails, the second hot water / water mixing device 7 is once driven to the fully open side of the water, and the controller 62 can confirm that the second hot water / water mixing device 7 operates normally. The opening degree of the second hot water / water mixing device 7 may be changed so that the hot water temperature set by the remote controller 61 is reached. By controlling the second hot water / water mixing device 7 in this way, it is possible to supply the hot water temperature requested by the user to the hot water supply terminal 40 after ensuring the safety of the user without fail. It is possible to provide a hot water storage hot water heater with high performance.

  The first hot water / mixer 4 and the second hot water / mixer 7 are not provided as separate units, but can be configured to be integrated, thereby saving space.

(Embodiment 2)
Since the configuration of the hot water storage type hot water heater in the second embodiment is the same as that in the first embodiment, the description thereof will be omitted, and the same reference numerals as those in the first embodiment will be given. The operation and action of the second hot water / mixer 7 will be described.

  First, the user sets the temperature of hot water discharged from the hot water supply terminal 40 using the remote controller 61. And the opening degree of the 2nd hot-water mixing apparatus 7 is changed so that the 2nd thermistor 52 may become the temperature of the hot water set with the remote control 61. FIG. On the other hand, the hot water requested by the user is supplied to the hot water supply terminal 40 by fully opening the opening of the first hot water / mixer 4 to the hot water side. Thus, normal temperature control is performed using only one of the hot and cold water mixing devices, so that the durability of the unused hot water and water mixing device is not deteriorated.

  However, the second thermistor 52 detects an abnormal temperature different from the temperature set by the remote controller 61 because the second hot water / water mixing device is stuck at the hot water side fully open position or stuck at the hot water side due to some failure. Resulting in. Alternatively, even if the second thermistor 52 itself fails and the second hot water / water mixing device is normal, the hot water temperature cannot be adjusted normally.

  Therefore, when an abnormal temperature is detected by the second thermistor 52, it is possible to prevent the high temperature from being supplied to the hot water supply terminal 40 by opening the opening of the first hot water / water mixing device 4 to the water side fully open.

  The first hot water / mixer 4 and the second hot water / mixer 7 are not provided as separate units, but can be configured to be integrated, thereby saving space.

(Embodiment 3)
Since the configuration of the hot water storage type hot water heater in the third embodiment is the same as that in the first embodiment, the description thereof will be omitted, and the same reference numerals as those in the first embodiment will be given. The operation and action of the second hot water / mixer 7 will be described.

  First, the user sets the temperature of hot water discharged from the hot water supply terminal 40 using the remote controller 61. And the opening degree of the 1st hot water mixing device 4 and the opening degree of the 2nd hot water mixing device 7 are changed so that the 2nd thermistor 52 may become the temperature of the hot water set with the remote control 61. FIG.

  The opening degree of the second hot water / mixer 7 is determined so that the temperature detected by the second thermistor 52 becomes the temperature set by the remote controller 61, while the opening degree of the first hot water / mixer 4 is set to the first level. The temperature detected by the thermistor 51 is determined to be a predetermined temperature higher than the temperature set by the remote controller 61.

  That is, in the first hot water / water mixing device, hot water and water are once mixed so as to be a temperature higher by a predetermined temperature A than the set temperature, and sent to the second hot water / water mixing device at a temperature higher than the set temperature by the predetermined temperature A. Therefore, since the temperature of the hot water supplied to the second hot water / water mixing device is substantially constant, the temperature of the hot water mixed in the second hot water / water mixing device can be stabilized.

  If the first hot water / water mixing device breaks down, the first thermistor 51 is abnormal at a temperature different from the temperature set by the remote controller 61 if it is fixed at the hot water side fully open position or fixed at the hot water side. The temperature will be detected. Or even if the 1st thermistor 51 itself fails and the 1st hot water mixing apparatus is normal, temperature control cannot be performed normally.

  Therefore, when the abnormal temperature is detected by the first thermistor 51, the opening degree of the second hot water / water mixing device 7 is set so that the temperature detected by the second thermistor 52 next becomes the hot water temperature set by the remote controller 61. change. As a result, even if the first hot water / mixing device 4 cannot be driven due to a failure, the second hot water / water mixing device 7 can be driven, so that the user immediately supplies hot water at a desired temperature from the hot water supply terminal 40. It won't be impossible to get.

  Moreover, in the 1st hot water mixing device 4, even if the 2nd hot water mixing device 7 malfunctions by mixing hot water so that it may become the temperature below a certain predetermined temperature B (for example, 60 degreeC), the hot water supply terminal 40 is provided. Since hot water with a temperature equal to or lower than the predetermined temperature B is supplied to the, burns can be prevented.

  Moreover, although it is possible to produce | generate hot water of desired temperature with the 2nd hot water mixing apparatus 7, if it continues using as it is, if the 2nd hot water mixing apparatus 7 should also break down, it will be high temperature from the hot water supply terminal 40. If the first hot water mixing device 4 fails, the hot water supplied to the hot water supply terminal 40 is mixed by the second hot water mixing device 7 while the remote controller 61 or the like is Although it is possible to continue the hot water supply operation, please contact the service company because there is an abnormal part. ”By displaying to the user that the first hot water mixing device 4 has failed. I can inform you. By displaying in this way, while giving the user a sense of security, it is possible to notify the user that there is an abnormality in the water heater and to prompt the user for repair / maintenance.

In addition, the hot water supply operation can be performed only for a predetermined period from the time when the first hot water / mixing device 4 breaks down, and the hot water supply operation cannot be performed after the predetermined period has elapsed. "Please contact the company." Before the second hot water and water mixing device 7 breaks down, making the hot water supply operation impossible and preventing hot water from being discharged from the hot water supply terminal 40. Good. By doing in this way, since the hot water supply operation is possible for a predetermined period after the failure of the first hot water / water mixing device 4, hot water requested by the user can be supplied to the hot water supply terminal 40. After the predetermined period has elapsed, the hot water supply operation can be stopped and the safety of the user can be ensured before the second hot water / mixer 7 breaks down.

  Further, when the first hot water / mixing device 4 fails, the second hot water / mixing device 7 is not mixed with the temperature of the hot water set by the remote controller 61 by changing the opening degree of the second hot water / water mixing device 7. It is good also as a structure which prevents high temperature hot water coming out of the hot water supply terminal 40 by driving to the side full open. By driving the second hot water mixing device 7 in this way, only water is supplied to the hot water supply terminal 40, so that the safety of the user can be reliably ensured.

  In addition, when the first hot water / mixing device 4 fails, the second hot water / water mixing device 7 is once driven to the fully open side of the water, and the controller 62 can confirm that the second hot water / water mixing device 7 operates normally. The opening degree of the second hot water / water mixing device 7 may be changed so that the hot water temperature set by the remote controller 61 is reached. By controlling the second hot water / water mixing device 7 in this way, it is possible to supply the hot water temperature requested by the user to the hot water supply terminal 40 after ensuring the safety of the user without fail. It is possible to provide a hot water storage hot water heater with high performance.

  On the other hand, when the first hot water / mixing device 4 is normal and the second hot water / water mixing device fails, the second thermistor is fixed at the hot water side fully open position or at the hot water side. At 52, an abnormal temperature different from the temperature set by the remote controller 61 is detected. Alternatively, even if the second thermistor 52 itself fails and the second hot water / water mixing device is normal, the hot water temperature cannot be adjusted normally.

  Therefore, when an abnormal temperature is detected by the second thermistor 52, it is possible to prevent the high temperature from being supplied to the hot water supply terminal 40 by opening the opening of the first hot water / water mixing device 4 to the water side fully open.

  As described above, even if one of the hot and cold water mixing devices fails, the other hot water and water mixing device is prevented from being driven to supply hot water to the hot water supply terminal 40. Can be provided.

  The first hot water / mixer 4 and the second hot water / mixer 7 are not provided as separate units, but can be configured to be integrated, thereby saving space.

  As described above, since the hot water heater of the present invention is configured to mix water with the two mixing valves, it prevents the hot water from being supplied to the hot water supply terminal 40 even if one of them fails. Therefore, it is possible to provide a hot water storage hot water heater with high safety, and it can be applied not only to a heat pump water heater but also to a hot water storage water heater using a heater type or solar heat as a heat source.

The block diagram of the hot water storage type water heater in Embodiment 1 of this invention Configuration of a conventional hot water heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heat pump 3 Outlet pipe 4 First hot water mixing apparatus 7 Second hot water mixing apparatus 21 Compressor 22 Water refrigerant heat exchanger 23 Expansion valve 24 Evaporator 27 Water pump 31 First hot water pipe 32 Second hot water supply pipe 33 Tank Water supply pipe 34 First water supply pipe 35 Second water supply pipe 40 Hot water supply terminal 51 First thermistor 52 Second thermistor 53 Flow rate detection means 61 Temperature setting means 62 Controller

Claims (7)

A hot water storage tank for storing hot water, a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank, a first water supply pipe for supplying water from a water supply source, the first water supply pipe and the hot water discharge pipe are connected to supply hot water. A first hot water mixing device to be mixed, a first hot water pipe through which hot water mixed in the first hot water mixing device flows, and a first hot water pipe and a second hot water pipe branched from the first hot water pipe. A hot water storage type water heater comprising a second hot water mixing device for mixing hot water and a second hot water supply pipe through which hot water mixed in the second hot water mixing device flows. A hot water temperature setting means for setting the temperature of hot water supplied to the hot water supply terminal, a first thermistor for detecting the temperature of hot water flowing through the first hot water supply pipe, and a first for detecting the temperature of hot water flowing through the second hot water supply pipe. Two thermistors, and the opening of the first hot and cold water mixing device is controlled so that the temperature detected by the first thermistor becomes the temperature of the hot water set by the hot water temperature setting means, The hot water storage type hot water heater according to claim 1, wherein the second hot water and water mixing device is fully opened on the hot water side. When the first thermistor detects an abnormality, the opening degree of the second hot water / water mixing device is set so that the temperature detected by the second thermistor becomes the hot water temperature set by the hot water temperature setting means. The hot water storage water heater according to claim 2, wherein the hot water heater is controlled. A hot water temperature setting means for setting the temperature of hot water supplied to the hot water supply terminal, a first thermistor for detecting the temperature of hot water flowing through the first hot water supply pipe, and a first for detecting the temperature of hot water flowing through the second hot water supply pipe. And the opening of the second hot and cold water mixing device is controlled so that the temperature detected by the second thermistor is the temperature of the hot water set by the hot water temperature setting means, The hot water storage type hot water heater according to claim 1, wherein the first hot water and water mixing device is fully opened on the hot water side. A hot water temperature setting means for setting the temperature of hot water supplied to the hot water supply terminal, a first thermistor for detecting the temperature of hot water flowing through the first hot water supply pipe, and a first for detecting the temperature of hot water flowing through the second hot water supply pipe. And the opening of the second hot and cold water mixing device is controlled so that the temperature detected by the second thermistor is the temperature of the hot water set by the hot water temperature setting means, The opening degree of the first hot water / water mixing device is controlled so that the temperature detected by the first thermistor is a predetermined temperature higher than the temperature of the hot water set by the hot water temperature setting means. The hot water storage water heater according to claim 1. The hot water storage type water heater according to claim 4 or 5, wherein when the second thermistor detects an abnormality, the opening degree of the first hot and cold water mixing device is controlled to be fully opened on the water side. The hot water storage water heater according to any one of claims 1 to 6, wherein the first hot water mixing device and the second hot water mixing device are integrally configured.

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