JP4995032B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus that can ensure safety even when a hot water supply mixing valve fails.

Conventionally, in this type, hot water stored in the upper part of the hot water tank and low-temperature water are mixed with a hot water mixing valve so as to reach a hot water temperature set by a remote controller, and hot water is appropriately supplied. (For example, refer to Patent Document 1.)
JP 2005-30661 A

  However, in this conventional system, in the case of a malfunction in which the hot water supply mixing valve is locked in a high temperature hot water supply state, high temperature water is poured out until the hot water tap is closed, and the hot water tap is once closed. Later, when the set temperature was lowered and the hot water was discharged, unexpectedly hot water was discharged and there was a risk of burns, which was a safety problem.

  This invention pays attention to this point, and in order to solve the above-mentioned problem, in particular, in claim 1, the water supply pipe is connected to the lower end portion and the hot water discharge pipe for discharging the hot water stored in the hot water is at the upper end. A hot water storage tank connected to the hot water tank, heating means for heating the hot water in the hot water storage tank to high temperature, high temperature water from the hot water discharge pipe, and low temperature water from the first bypass pipe branched from the water supply pipe A hot water mixing valve for mixing at an arbitrary hot water supply set temperature and supplying hot water from a hot water tap, hot water from the hot water pipe, and low temperature water from a second bypass pipe branched from the water supply pipe to an arbitrary bath set temperature What is equipped with a bath mixing valve that mixes and fills the bath from the hot water filling pipe, and when the hot water mixing valve is locked on the high temperature side, this is detected and the bath mixing valve is connected via the hot water control section The tapping pipe and the second bypass pipe are in communication It is for driving such that.

  According to a second aspect of the present invention, the opening of the bath mixing valve is 50% on the side of the hot water pipe and 50% on the side of the second bypass pipe.

  As described above, according to the present invention, when a failure occurs in which the hot water supply mixing valve is locked on the high temperature side, the bath mixing valve is driven so that the hot water discharge pipe side and the second bypass pipe side communicate with each other. By supplying hot water from the hot water supply mixing valve in the state, low temperature water is mixed into the high temperature water in the hot water discharge pipe from the second bypass pipe in the communication state, the hot water temperature is lowered to some extent, and there is no risk of burns. It can be used safely until

  Further, according to the second aspect, the communication at the maximum opening of the bath mixing valve is achieved, and the temperature of the high temperature water can be surely lowered by mixing a large amount of water supply, thereby improving safety. .

  Next, a hot water storage type hot water supply apparatus according to an embodiment of the present invention will be described with reference to FIGS. 2 to 10, hatched hatched lines in the hot water storage tank indicate low temperature water, double hatched lines indicate medium hot water, triple hatched lines indicate hot water, and arrows indicate the flow direction of hot water.

  This hot water storage type hot water supply device boils and stores hot water in the midnight hours when the unit price of contracted power by time is low, and uses the hot water stored for hot water supply. 1 is a hot water storage tank 2 for storing hot water. 3 is a heat pump unit that heats the hot water in the hot water storage tank, 4 is a hot water tap that is a hot water tap provided in a kitchen or a washroom, and 5 is a hot water supply that is provided near the hot water tap 4. A remote control, 6 is a bathtub, and 7 is a bath remote control provided in the bathroom.

  The hot water storage tank 2 of the hot water storage tank unit 1 has a hot water discharge pipe 8 connected to the upper end, a water supply pipe 9 connected to the lower end, a heat pump forward pipe 10 connected to the lower part, and a heat pump return pipe 11 connected to the upper part. The hot water in the hot water storage tank 2 taken out from the heat pump forward pipe 10 by the unit 3 is boiled and returned to the hot water storage tank 2 from the heat pump return pipe 11 to be stored, and hot water in the hot water storage tank 2 is pushed up by the water supply from the water supply pipe 9. The hot water in the upper part of the hot water storage tank 2 is pushed out from the hot water discharge pipe 8 to supply hot water.

  The heat pump unit 3 includes a compressor 12, a refrigerant-water heat exchanger 13 as a condenser, an electronic expansion valve 14, a forced air-cooled evaporator 15, a heat pump circuit 16 as a heating means, and a hot water storage tank 2. A heat pump circulating pump 17 for circulating the hot water in the refrigerant to the refrigerant-water heat exchanger 13 via the heat pump forward pipe 10 and the heat pump return pipe 11, and a heat pump controller 18 for controlling the driving of the heat pump. In the circuit 16, carbon dioxide is used as a refrigerant to constitute a supercritical heat pump cycle. Since carbon dioxide is used as the refrigerant, low-temperature water can be boiled up to a high temperature of about 90 ° C. without an electric heater.

  Here, the refrigerant-water heat exchanger 13 employs a counter flow system in which the refrigerant and hot water in the hot water storage tank 2 that is heated water face each other, and in the supercritical heat pump cycle, the refrigerant is exchanged during heat exchange. Since the water to be heated can be efficiently heated to a high temperature because it is condensed in a supercritical state, the temperature difference between the refrigerant-water heat exchanger 13 inlet temperature and the refrigerant outlet temperature is made constant. By controlling the pressure reducer 14 or the compressor 12, the COP (energy consumption efficiency) is 3.3 when the inlet temperature of the refrigerant-water heat exchanger 13 to be heated is a low temperature of about 5 to 20 ° C. It is possible to heat the water to be heated in a very good state of 0 or more.

  Reference numeral 19 denotes a heat exchanger for heating the hot water in the bathtub 6, and on the primary side thereof, there are a high temperature water discharge pipe 20 connected to the upper part of the hot water storage tank 2 and an intermediate hot water return pipe 21 connected to the lower part of the hot water storage tank 2. Is connected to form a heat exchanger circuit 22, and high-temperature water taken out from the hot water storage tank 2 is circulated to the heat exchanger 19 by operating a heat exchanger pump 23 provided in the middle hot water return pipe 21 to exchange heat. Accordingly, the medium-temperature water whose temperature has been lowered by the above is returned to the hot water storage tank 2 again.

  On the secondary side of the heat exchanger 19, a bath circulation circuit 26 composed of a bath outlet pipe 24 and a bath return pipe 25 is connected so as to be able to circulate hot water in the bathtub 6, and is provided in the middle of the bath return pipe 25. The hot water in the bathtub 6 is circulated to the heat exchanger 19 by the operation of the bath circulation pump 27 and heated by the high temperature water on the primary side, so that the hot water in the bathtub 6 is kept warm or chased. Reference numeral 28 denotes a bath temperature sensor that detects the temperature of hot water in the bathtub 6 circulating through the bath return pipe 25.

  Next, 29 is an intermediate temperature hot water discharge pipe connected to an intermediate position of the hot water storage tank 2 which is higher than the intermediate hot water return pipe 21 and lower than the hot water discharge pipe 8, and exchanges heat with the secondary side in the heat exchanger 19. The lowered medium temperature water is discharged from the hot water storage tank 2.

  Reference numeral 30 denotes an intermediate temperature water mixing valve provided downstream of the intermediate temperature hot water discharge pipe 29. The intermediate temperature water mixing valve near the intermediate position of the hot water storage tank 2 and hot water from the hot water discharge pipe 8 connected to the upper end of the hot water storage tank 2 are The hot water temperature detected by the hot water temperature sensor 32 provided in the downstream first hot water discharge pipe 31 is a constant temperature (for example, 5 ° C.) higher than the hot water set temperature or bath set temperature set by the user using the hot water remote controller 5 or the bath remote controller 7. The mixing ratio is controlled to be an arbitrary predetermined temperature.

  Here, the intermediate hot water outlet pipe 29 is connected via a hot water outlet switching valve 33 to a first intermediate hot water outlet 34 and a second intermediate hot water outlet 35 provided above and below an intermediate position of the hot water storage tank 2. Middle hot water stored near the intermediate position of the hot water storage tank 2 from one of the hot water outlets is discharged toward the intermediate hot water mixing valve 30, and the hot water storage tank slightly below the first intermediate warm water hot water outlet 34 below. The hot water outlet switching valve 33 is switched according to the temperature detected by the medium hot water temperature sensor 36 provided on the two side surfaces.

  Next, reference numeral 37 denotes a hot water supply mixing valve composed of an electric mixing valve for mixing hot water from the first hot water discharge pipe 31 and low temperature water from the first bypass pipe 38 branched from the water supply pipe 9, and hot water supply downstream thereof. The mixing ratio is controlled so that the hot water temperature detected by the hot water supply temperature sensor 40 provided in the pipe 39 becomes the hot water supply set temperature set by the user using the hot water remote controller 5 or the bath remote controller 7.

  Reference numeral 41 denotes an electric mixing valve that mixes hot water from the second hot water pipe 42 branched from the first hot water pipe 31 and low-temperature water from the second bypass pipe 43 branched from the water supply pipe 9. The bath remote control 7 sets the hot water temperature detected by the hot water temperature sensor 45 provided in the hot water hot water pipe 44 which is a second hot water supply end connected to the bath circulation circuit 26 on the downstream side. In order to prevent natural convection during normal stop, the second outlet pipe 42 side is closed and the second bypass pipe 43 side is 100% open.

  The hot water filling pipe 44 has a hot water filling valve 46 for starting / stopping hot water filling to the bathtub 6 via the bath circulation circuit 26 and a bath flow rate counter 47 for counting the amount of hot water filling to the bathtub 6. It is provided.

  Next, a plurality of hot water storage temperature sensors 48 are arranged in the vertical direction of the hot water storage tank 2, and the amount of heat remaining in the hot water storage tank 2 is detected based on temperature information detected by the hot water storage temperature sensor 48. And the temperature distribution of the up-down direction in the hot water storage tank 2 is detected.

  The hot water remote controller 5 and the bath remote controller 7 are respectively provided with hot water temperature setting switches 49 and 50 for setting the hot water setting temperature and bath temperature setting switches 51 and 52 for setting the bath setting temperature. Bath automatic switches 53 and 54 are provided for hot water at a bath set temperature by a hot water amount set by a hot water amount setting switch (not shown) of the bath remote controller 7 and keeping the temperature for a predetermined time. .

  Reference numeral 55 denotes a hot water supply control unit having a microcomputer that receives the input of each sensor in the hot water storage tank unit 1 and controls the drive of each actuator. The hot water remote controller 5 and the bath remote controller 7 are connected to the hot water controller 55 by radio or wire so that the user can set an arbitrary hot water set temperature and bath set temperature.

  Further, the hot water supply control unit 55 detects that the hot water temperature sensor 40 detects a temperature several degrees higher than the hot water set temperature, here 3 ° C. or more for a predetermined time or more, here 5 seconds or more. It is determined that the high temperature side failure error of the hot water supply mixing valve 37 is output, and an error display of the high temperature side failure of the hot water supply mixing valve 37 is displayed on the remote controllers 5 and 7, and the bath mixing valve 41 in the normally stopped state is set to the second state. Opening is performed with a maximum opening ratio of 50% on the side of the hot water pipe 42 and 50% on the side of the second bypass pipe 43, and drive control is performed so that the second hot water pipe 42 and the second bypass pipe 43 are in communication.

  On the other hand, the hot water supply control unit 55 detects that the temperature of the hot water supply temperature sensor 40 is several degrees lower than the set temperature of the hot water supply, that is, −3 ° C. or higher, for a predetermined time or longer, here 5 seconds or longer. Therefore, the low temperature side failure error of the hot water supply mixing valve 37 is output, the low temperature side failure error of the hot water supply mixing valve 37 is displayed on the remote controllers 5 and 7, and there is no fear of burn even under normal control. The mixing valve 41 is not driven and remains stopped.

  Note that 56 is an overpressure relief valve for releasing the overpressure of the hot water storage tank 2, 57 is a water supply temperature sensor for detecting the temperature of the water supply, 58 is a pressure reducing valve for reducing the pressure of the water supply, and 59 is for counting the amount of hot water supplied. This is a hot water flow rate counter.

Next, the operation of this embodiment will be described.
First, the boiling operation shown in FIG. 2 will be described. When the hot water storage temperature sensor 48 detects that the required amount of heat does not remain in the hot water storage tank 2 in the midnight electric power time zone, the hot water supply control section 55 A boiling start command is issued to the control unit 18. Upon receiving the command, the heat pump controller 18 starts driving the heat pump circulation pump 17 after starting the compressor 12, and cools the low temperature water of about 5 to 20 ° C. taken out from the heat pump forward pipe 10 connected to the lower part of the hot water storage tank 2 as a refrigerant. -Heated to a high temperature of about 70 to 90 ° C in the water heat exchanger 13, returned to the hot water storage tank 2 from the heat pump return pipe 11 connected to the upper part of the hot water storage tank 2, and stacked in order from the upper part of the hot water storage tank 2 Store hot water. When the hot water storage temperature sensor 48 detects that the necessary amount of heat has been stored, the hot water supply control unit 55 issues a boiling stop command to the heat pump control unit 18, and the heat pump control unit 18 stops the compressor 12 and heat pump circulation. The pump 17 is also stopped and the boiling operation is finished.

  Next, the hot water supply operation shown in FIG. 3 will be described. When the hot water tap 4 is opened, the water supplied from the water supply pipe 9 flows into the hot water storage tank 2. At this time, since the boiled high-temperature water is stored at the position of the medium temperature water temperature sensor 36 in the hot water storage tank 2, the medium temperature water temperature sensor 36 detects a temperature equal to or higher than a predetermined value, and the hot water supply control unit 55. As a result, the intermediate warm water switching valve 33 is switched to the lower first intermediate warm water outlet 34, and hot water is pushed out from the first intermediate warm water outlet 34 to the intermediate warm water mixing valve 30 through the intermediate warm water outlet pipe 29. . In the hot water storage tank 2, high temperature water is stored in the upper part and low temperature water is stored in the lower part. However, a specific gravity difference is generated due to the temperature difference, and a high temperature water having a low specific gravity is formed on the upper part by forming a temperature boundary layer. Since low-temperature water with a high specific gravity is located at the lower part, they do not mix with each other.

  Here, the hot water supply control unit 55 mixes hot water from the hot water tap pipe 29 and hot water from the hot water pipe 8 and is constant from the hot water set temperature set by the hot water remote controller 5 or the bath remote controller 7 at the hot water mixing valve 30. The intermediate warm water mixing valve 30 is adjusted to an appropriate ratio so that the temperature is higher than the temperature. Here, since the hot water flowing in from the intermediate temperature hot water outlet pipe 29 is hot and higher than the hot water supply set temperature, the outlet hot water pipe 8 side of the intermediate temperature water mixing valve 30 is closed.

  Then, the hot water flowing out from the intermediate hot water mixing valve 30 flows into the hot water supply mixing valve 36 through the first hot water outlet pipe 31 and is mixed with the low temperature water from the first bypass pipe 38, and the hot water supply control unit 55 performs the hot water supply mixing valve 36. The hot water at the hot water supply set temperature is supplied from the hot water tap 4 by adjusting the mixing ratio. Then, the hot water supply is completed by closing the hot water tap 4.

  Here, when the intermediate hot water temperature sensor 36 detects a temperature equal to or lower than a predetermined value, the hot water supply control unit 55 switches the hot water outlet switching valve 33 to the upper second intermediate hot water hot water outlet 35 side as shown in FIG. Hot water is discharged from the intermediate temperature water outlet 35. Therefore, when high temperature water or medium temperature water is stored near the lower first intermediate hot water outlet 34, hot water is discharged from the first intermediate hot water outlet 34, and the water supply pipe 9 is provided near the first intermediate hot water outlet 34. When the low-temperature water from the hot water is stored, the hot water is discharged from the second intermediate hot water outlet 35, and the hot water in the hot water storage tank 2 can be used for hot water supply without being left over.

  In addition, since the intermediate hot water mixing valve 30 supplies hot water having a temperature higher than a predetermined hot water supply temperature by a certain temperature to the first hot water discharge pipe 31, the first intermediate hot water hot water outlet 34 and the second intermediate hot water hot water outlet. When the temperature of the hot water discharged from the hot water 35 is lower than the hot water supply set temperature, the hot water control section 55 adjusts the mixing ratio of the intermediate hot water mixing valve 30 as shown in FIG. Use hot water stored in the upper part of the hot water storage tank 2 so that hot water having a temperature higher than the preset hot water supply temperature is supplied to the first hot water discharge pipe 31, giving priority to hot water from an intermediate position of the hot water storage tank 2. It is possible to secure a larger amount of high-temperature water as a heat source.

  Next, the hot water filling operation to the bathtub 6 shown in FIG. 6 will be described. When any of the hot water remote control 5 or the bath automatic switches 53 and 54 of the bath remote control 7 is operated, the hot water supply control unit 55 makes the hot water filling valve 46. Open the valve. Then, the water supply from the water supply pipe 9 flows into the hot water storage tank 2. At this time, since the boiled high-temperature water is stored at the position of the medium temperature water temperature sensor 36 in the hot water storage tank 2, the medium temperature water temperature sensor 36 detects a temperature equal to or higher than a predetermined value, and the hot water supply control unit 55. As a result, the intermediate warm water switching valve 33 is switched to the lower first intermediate warm water outlet 34, and hot water is pushed out from the first intermediate warm water outlet 34 to the intermediate warm water mixing valve 30 through the intermediate warm water outlet pipe 29. .

  Here, upon receiving input from the automatic bath switches 53 and 54, the hot water supply control unit 55 mixes hot water from the intermediate hot water outlet pipe 29 and hot water from the outlet pipe 8, and uses the intermediate hot water mixing valve 30 to supply the hot water remote controller 5 or 5. The intermediate temperature water mixing valve 30 is adjusted to an appropriate ratio so that the temperature is higher than a predetermined temperature by a bath set temperature set by the bath remote controller 7. Here, since the hot water flowing from the intermediate temperature hot water outlet pipe 29 is at a high temperature and higher than the bath set temperature, the outlet hot water pipe 8 side of the intermediate temperature water mixing valve 30 is closed.

  The hot water flowing out from the intermediate hot water mixing valve 30 is discharged to the second hot water discharge pipe 42 via the first hot water discharge pipe 31. Then, the hot water from the second hot water outlet pipe 42 flows into the bath mixing valve 41 and is mixed with the low temperature water from the second bypass pipe 43, and the hot water supply control unit 55 adjusts the mixing ratio of the bath mixing valve 41 to set the bath. Hot water having a temperature is filled from the filling tube 44 to the bathtub 6 through the bath circulation circuit 26. Here, when the medium hot water temperature sensor 36 detects a temperature equal to or lower than a predetermined value, the hot water supply control unit 55 moves the hot water outlet switching valve 33 to the upper side of the second intermediate hot water hot water outlet 34 as in the case of the hot water supply operation described in FIG. The hot water is discharged from the second intermediate hot water outlet 34.

  Then, when a bath flow counter 47 provided in the middle of the hot water filling pipe 44 counts a predetermined hot water filling amount, the hot water supply control unit 55 closes the hot water filling valve 46 and ends the hot water filling operation. The arbitrary mixing temperature is set to a temperature higher than the preset hot water supply temperature by a certain temperature.

  Next, the heat insulation operation or reheating operation of the bath shown in FIG. 7 will be described. Following the hot water filling operation to the bathtub 6, the hot water supply control unit 55 drives the bath circulation pump 27 at regular intervals, and the bathtub 6 The bath temperature sensor 28 detects the hot water temperature inside. When the temperature detected by the bath temperature sensor 28 is lower than the bath set temperature by a predetermined value or more, the hot water supply control unit 55 starts driving the heat exchange circulation pump 23 and the bath circulation pump 26 and removes it from the high temperature water discharge pipe 20. The high-temperature water is allowed to flow into the heat exchanger 19 to exchange heat with the secondary-side bath water, and the bath is kept warm or operated. Then, the intermediate temperature water whose temperature has decreased due to the heat exchange returns to the lower part of the hot water storage tank 2 via the intermediate temperature water return pipe 21 and the hot water is stored in such a way as to push up the boundary surface between the high temperature water and the intermediate temperature water. Is. In the hot water storage tank 2, high temperature water is stored in the upper part, medium temperature water is stored in the middle part, and low temperature water is stored in the lower part. If the temperature difference is about 20 ° C, a specific gravity difference occurs and a temperature boundary layer is formed. Since the high-temperature water having a low specific gravity is located at the upper part, the intermediate intermediate water is located at the intermediate part, and the low-temperature water having a high specific gravity is located at the lower part, they are not mixed with each other.

  Then, on the secondary side, when the bath water heated by the heat exchanger 19 returns to the bathtub 6 to raise the temperature in the bathtub 6 and the temperature detected by the bath temperature sensor 28 reaches the bath set temperature, the hot water supply control is performed. The unit 55 stops driving the heat exchange circulation pump 23 and the bath circulation pump 26 to stop the heat insulation operation or the chasing operation.

  Next, a hot water supply operation after intermediate hot water is stored in the hot water storage tank 2 will be described. As shown in FIG. 8, when intermediate warm water is stored near the first intermediate warm water outlet 34 and the intermediate warm water temperature sensor 36 detects intermediate warm water, the outlet switching valve 33 is set to the first intermediate warm water outlet. When the hot water supply mixing tap 3 is opened, the water supply from the water supply pipe 9 flows into the hot water storage tank 2 and at the same time, the intermediate hot water is pushed out from the first intermediate hot water outlet 34 and the intermediate hot water outlet pipe. It flows into the warm water mixing valve 30 through 29.

  Here, when the temperature of the hot water pushed out from the first intermediate hot water outlet 34 is lower than the hot water supply set temperature, the mixing ratio of the intermediate hot water mixing valve 30 is adjusted, and the high temperature from the hot water discharge pipe 8 at the upper end of the hot water storage tank 2 is adjusted. The hot water is mixed with water and supplied at a constant temperature higher than the hot water supply set temperature.

  Then, the hot water flowing out from the intermediate hot water mixing valve 30 flows into the hot water supply mixing valve 36 through the first hot water outlet pipe 31 and is mixed with the low temperature water from the first bypass pipe 38, and the hot water supply control unit 55 performs the hot water supply mixing valve 36. The hot water at the hot water supply set temperature is supplied from the hot water tap 4 by adjusting the mixing ratio. Then, the hot water supply is completed by closing the hot water tap 4.

  Here, when the medium hot water temperature sensor 36 detects a temperature equal to or lower than a predetermined value, the hot water supply control unit 55 switches the hot water outlet switching valve 33 to the upper second intermediate hot water hot water outlet 35 side, as shown in FIG. 2. Hot water is discharged from the medium hot water outlet 35. Therefore, when high temperature water or medium temperature water is stored near the lower first intermediate hot water outlet 34, hot water is discharged from the first intermediate hot water outlet 34, and the water supply pipe 9 is provided near the first intermediate hot water outlet 34. When the low-temperature water from the hot water is stored, the hot water is discharged from the second intermediate hot water outlet 35, and the hot water in the hot water storage tank 2 can be used for hot water supply without being left over.

  In addition, since the intermediate hot water mixing valve 30 supplies hot water having a temperature higher than a predetermined hot water supply temperature by a certain temperature to the first hot water discharge pipe 31, the first intermediate hot water hot water outlet 34 and the second intermediate hot water hot water outlet. When the temperature of the hot water discharged from the hot water 35 is lower than the hot water supply set temperature, the mixing ratio of the intermediate hot water mixing valve 30 is adjusted by the hot water control unit 55 to be higher than the hot water set temperature using the high temperature water from the hot water discharge pipe 8. Hot water at a high temperature is supplied to the first tapping pipe 31, priority is given to tapping from the intermediate position of the hot water storage tank 2, and the use of high temperature water stored in the upper part of the hot water storage tank 2 is minimized. It becomes possible to secure more high-temperature water as a heat source.

  Next, when the hot water filling operation is started during the hot water supply operation shown in FIG. 10 or when the hot water supply operation is started during the hot water filling operation, the hot water supply control unit 55 compares the hot water supply set temperature with the bath set temperature. In addition, a temperature that is a certain temperature higher than the higher temperature is set as an arbitrary predetermined temperature in the intermediate temperature water mixing valve 30.

  In this way, hot water can be supplied using as much hot water as possible as the heat source according to any hot water set temperature at that time, and the hot water set temperature on the side where hot water is not supplied is high Even if it exists, since the arbitrary predetermined temperature mixed with the intermediate temperature water mixing valve is set to a constant temperature higher than the hot water supply set temperature on the side where the hot water supply temperature is actually supplied, the amount of intermediate temperature water is increased as much as possible. Since hot water can be used, and even when there is a need for simultaneous hot water supply from a plurality of hot water supply ends, the hot water mixing valve 30 discharges hot water at a constant temperature higher than the higher set temperature. In addition, hot water of each set temperature can be simultaneously supplied while effectively using medium temperature water, and use of high temperature water as a heat source can be suppressed, and a large capacity as a heat source can be secured.

  The intermediate hot water return pipe 21 is connected to a position higher than the water supply pipe 9 at the lowermost end of the hot water storage tank 2 and the lower heat pump forward pipe 10, so that the intermediate hot water used as a heat source is returned to the hot water storage tank 2. Even if the hot water is used, low temperature water flows from the lower end of the hot water storage tank 2 and the low temperature water is secured at the lowermost end of the hot water storage tank 2. There is an effect that it can be boiled from low-temperature water.

  Further, since the first intermediate warm water outlet 34 and the second intermediate warm water outlet 35 are provided at a position higher than the intermediate warm water return pipe 21, the intermediate warm water return pipe 21, the first intermediate warm water outlet 34, and the second A certain amount of capacity can be secured between the hot water outlet 35 and the hot water whose temperature has been lowered by the heat exchanger 19 can be temporarily stored by that capacity, and the hot water is discharged from the hot water outlet pipe 29. The medium temperature water that cannot be reduced can be reduced as much as possible. Moreover, since the first medium temperature water outlet 34 and the second medium temperature water outlet 35 are provided vertically, the lower first medium temperature water outlet 34 is provided. Even if the intermediate warm water is stored above, the intermediate warm water can be discharged from the upper second intermediate warm water outlet 35, and the intermediate warm water used as a heat source is wasted in the hot water storage tank 2. Effective for hot water supply It can be used.

  Here, if the intermediate warm water return pipe 21 and the first intermediate warm water outlet 34 or the second intermediate warm water outlet 35 are at the same height, the intermediate warm water is stored at a higher position than the intermediate warm water return pipe 21. Since this cannot be taken out from the first intermediate hot water outlet 34 or the second intermediate hot water outlet 35 that is at the same height as the intermediate hot water return pipe 21, the intermediate hot water is generated at the same time. It is necessary to use medium-temperature water for hot water supply, otherwise hot water is stored in the hot water storage tank 2 until hot water is supplied and the hot water is pushed up to the hot water discharge pipe 8 connected to the upper end of the hot water storage tank 2. It will end up. However, in this embodiment, since the first intermediate hot water outlet 34 or the second intermediate hot water outlet 35 is provided at a position higher than the intermediate warm water return pipe 21 as described above, the difference capacity of this height is provided. The effect of being able to use medium-temperature water for hot water supply even if hot water is supplied at a time interval after generating a certain volume of medium-temperature water from the generation or use of medium-temperature water. There is.

  Thus, since the hot water used as a heat source during hot water supply is taken out from the hot water storage tank 2 in preference to the hot water and hot water is supplied, the hot water cannot be supplied until the hot water is fully supplied. Whenever hot water is supplied, the medium temperature water in the hot water storage tank 2 decreases and is replaced with the low temperature water from the water supply pipe 9, and when performing a boiling operation at midnight, the temperature is not low but the temperature is not low. The low-temperature water is boiled by the heat pump circuit 16, which improves the boiling efficiency and improves the COP (energy consumption efficiency) as the heat pump type hot water supply apparatus.

  Next, as shown in FIGS. 3 to 5, when the hot water supply mixing valve 37 is locked on the high temperature side and fails during hot water supply, the hot water supply temperature detected by the hot water supply temperature sensor 40 in step 60 is as shown in the flowchart of FIG. It is determined whether or not the hot water supply set temperature + 3 ° C. or more. If YES, the process proceeds to step 61 to prevent erroneous detection. It is determined whether this has continued for 5 seconds or more. When the hot water supply control unit 55 outputs the high temperature side failure error of the hot water supply mixing valve 37, the process proceeds to step 62 to display the high temperature side failure error of the hot water supply mixing valve 37 on each remote controller 5, 7 and then to step 63. Thus, the bath mixing valve 41 is opened with a maximum opening ratio of 50% on the second outlet pipe 42 side and 50% on the second bypass pipe 43 side so that the second outlet pipe 42 and the second bypass pipe 43 are in communication with each other. Driven Thus, when hot water is supplied, the hot water is mixed from the second bypass pipe 43 into the high temperature water flowing through the first hot water pipe 31 via the second hot water pipe 42, and the hot water temperature is lowered. The temperature of the hot water supply from the mixing valve 37 can be lowered to provide a safe hot water supply with no fear of burns, and the hot water supply can be continued for the time being until the repairer arrives, improving usability.

  Further, when the hot water supply mixing valve 37 is locked on the high temperature side and fails, NO is determined in step 60, the process proceeds to step 64, where it is determined whether the hot water supply set temperature is −3 ° C. or less. Then, it is determined whether or not this has continued for 5 seconds or more, and it is determined that the hot water supply mixing valve 37 has failed on the low temperature side with YES, so that the hot water supply control unit 55 outputs a low temperature side failure error of the hot water mixing valve 37 to step 66. The remote controllers 5 and 7 are made to display only the low temperature side failure error display of the hot water supply mixing valve 37. Since there is no risk of burns on the low temperature side, only the error display is performed, and the drive control of the bath mixing valve 41 is not performed. It is in a stopped state.

  In this embodiment, the heat exchanger 19, the heat exchange circulation pump 23, and the bath circulation pump 27 are provided in the hot water storage tank unit 1, but are provided in a separate unit body from the hot water storage tank unit 1. However, it does not preclude changing the embodiment without changing the gist of the present invention.

  In this embodiment, a bath circulation circuit 26 is provided on the secondary side of the heat exchanger 19, but a floor heating panel, a hot water hot air heater, a hot water panel convector, a hot water panel radiator, etc. A heating circulation circuit may be provided. In short, any heat equipment that uses heat of the hot water in the hot water storage tank 16 by exchanging heat with the heat exchanger 19 may be used.

  Furthermore, although the heat pump circuit 16 is illustrated as a means for heating the hot water in the hot water storage tank 2, the heat pump circuit 16 is not limited to this, and an electric heater directly disposed in the hot water storage tank 2 or hot water in the hot water storage tank 2 is circulated. Heating may be performed with an electric heater.

The schematic block diagram of one Embodiment of this invention. The figure explaining the action | operation of the boiling operation of the same embodiment. The figure explaining the action | operation of the hot water supply driving | operation of the same embodiment. The figure explaining the action | operation of the hot water supply driving | operation of the same embodiment. The figure explaining the action | operation of the hot water supply driving | operation of the same embodiment. The figure explaining the action | operation of the filling operation of the same embodiment. The figure explaining the action | operation of the heat retention / chase operation of the same embodiment. The figure explaining the action | operation of the hot water supply driving | running | working in case medium temperature water exists in the hot water storage tank of the same embodiment. The figure explaining the action | operation of the hot water supply driving | running | working in case medium temperature water exists in the hot water storage tank of the same embodiment. The figure explaining the action | operation of the hot water supply / hot water filling simultaneous operation in case medium temperature water exists in the hot water storage tank of the same embodiment. The flowchart when a hot water supply mixing valve) fails during the hot water supply operation of the same embodiment.

Explanation of symbols

2 Hot water storage tank 4 Hot water tap 8 Hot water discharge pipe 9 Water supply pipe 16 Heat pump circuit (heating means)
31 1st tapping pipe 37 Hot-water supply mixing valve 38 First bypass pipe 41 Bath mixing valve 42 Second tapping pipe 43 Second bypass pipe 44 Hot water filling pipe 55 Hot water supply control section

Claims (2)

  A hot water storage tank having a hot water storage pipe connected to the upper end of the hot water storage pipe connected to the lower end of the hot water stored in the hot water storage tank, and heating means for heating the hot water in the hot water storage tank to a high temperature; A hot water mixing valve that mixes hot water from the hot water pipe and low temperature water from the first bypass pipe branched from the water supply pipe to an arbitrary hot water supply set temperature to supply hot water from the hot water tap, and hot water from the hot water pipe And a bath mixing valve for mixing the low-temperature water from the second bypass pipe branched from the water supply pipe with an arbitrary bath set temperature and filling the bath from the hot water pipe to the bath. When the mixing valve is locked on the high temperature side, this is detected and the bath mixing valve is driven via the hot water supply control unit so that the outlet pipe and the second bypass pipe are in communication with each other. apparatus.   The hot water storage hot water supply apparatus according to claim 1, wherein the bath mixing valve has an opening degree of 50% on the side of the hot water pipe and 50% on the side of the second bypass pipe.

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