JP5009743B2 - Hot water storage water heater - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage hot water supply device that is provided with a medium temperature water mixing valve for actively using medium temperature water in a hot water storage tank and that is controlled to be safe when a hot water supply or bath mixing valve fails. .

Conventionally, in this type of water, hot water stored in a hot water storage tank has been taken out and used as a heat source for heating or reheating the hot water. Some returned to the inside of the tank, and the intermediate hot water was taken out from the middle part of the hot water storage tank and used for hot water supply. And this middle temperature water merged with the high temperature water from the hot water storage tank upper part, was mixed with the temperature more than the hot water supply preset temperature, and was supplied. (For example, refer to Patent Document 1.)
Japanese Patent No. 3854169

  By the way, in this conventional one, when the first mixing valve for hot water supply fails on the high temperature side, the mixed water from the intermediate hot water mixing valve is supplied with hot water as it is at a predetermined temperature higher than the set temperature of the remote controller. There was a risk of burns.

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 storage unit, heating means for heating the hot water in the hot water storage tank to a high temperature, an intermediate temperature hot water discharge pipe for allowing the intermediate temperature water generated by heat exchange to flow out of the hot water storage tank, and the hot water supply An intermediate temperature water mixing valve for mixing hot water from a pipe and intermediate temperature water from the intermediate temperature water discharge pipe to an arbitrary predetermined temperature, a first bypass branched from the hot water mixed by the intermediate temperature water mixing valve and the water supply pipe A first mixing valve that mixes low-temperature water from a pipe with an arbitrary first hot water supply set temperature and supplies hot water from a first hot water supply end; hot water mixed by the intermediate temperature water mixing valve; 2 Optional low temperature water from the bypass pipe In that a second mixing valve for hot water from the second hot-water supply terminal by mixing the hot water set temperature, failure at the first mixing valve or fewer or either the low temperature side of the second mixing valve Then, normal control is used, and in the case of a failure on the high temperature side, the intermediate hot water mixing valve is throttled on the side of the hot water pipe and the control on the side of the intermediate hot water hot water pipe is prioritized.

Further, in claim 2, a hot water storage tank having a hot water supply pipe connected to the upper end of the hot water storage pipe connected to the lower end of the hot water and a hot water stored in the hot water storage tank is heated to a high temperature. Heating means, intermediate temperature hot water discharge pipe for allowing intermediate temperature water generated by heat exchange to flow out of the hot water storage tank, high temperature water from the hot water discharge pipe, and intermediate temperature water from the intermediate temperature water discharge pipe at any predetermined temperature A first hot water mixing valve, a hot water mixed by the intermediate hot water mixing valve, and a low-temperature water from the first bypass pipe branched from the water supply pipe to an arbitrary first hot water supply set temperature. A first mixing valve for supplying hot water from a hot water supply end, hot water mixed by the intermediate temperature water mixing valve, and low-temperature water from a second bypass pipe branched from the water supply pipe are mixed at an arbitrary second hot water supply set temperature. A second mixing valve for supplying hot water from the second hot water supply end In those, wherein in the failure of the first mixing valve or fewer or either the low temperature side of the second mixing valve, with a normal control, the failure of the high-temperature side, hot water pipe side medium hot water mixing valve The middle hot water discharge pipe side is fully opened due to the blockage.

As described above, according to the present invention, in the failure on the low temperature side of either the first mixing valve for hot water supply or the second mixing valve for bath , there is no risk of burns. In the event of a malfunction on the high temperature side, the medium temperature water mixing valve is controlled so that hot water is not discharged as much as possible, so that medium temperature water without the risk of burns can be used for hot water and baths, and cannot be used until a repairer arrives. Is eliminated and can always be used with peace of mind.

  According to the second aspect of the present invention, it is possible to obtain COP (energy consumption efficiency) improvement by using medium-temperature water more reliably and safely and by heating from the low-temperature water. It is.

  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 for heating hot water in the hot water storage tank, 4 is a hot water tap as a first hot water supply end provided in a kitchen or a washroom, and 5 is provided in the vicinity of the hot water tap 4. A hot water supply 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 on the downstream first hot water pipe 31 is the hot water supply set temperature (first hot water set temperature) or the bath set temperature (second 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 that is a constant temperature (for example, 5 ° C.) higher than the (hot water supply set 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, 37 is a hot water supply mixing valve (first mixing valve) constituted by an electric mixing valve that mixes 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. The mixing ratio is controlled so that the hot water temperature detected by the hot water temperature sensor 40 provided in the downstream hot water supply pipe 39 becomes the hot water 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 hot water temperature detected by the hot water temperature sensor 45 provided in the hot water pipe 44 as the second hot water supply end connected to the bath circulation circuit 26 on the downstream side of the bath mixing valve (second mixing valve) is the bath temperature. The mixing ratio is controlled so that the remote controller 7 sets the bath set temperature set by the user.

  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 include hot water temperature setting switches 49 and 50 for setting a hot water set temperature (first hot water set temperature), and a bath temperature setting switch for setting a bath set temperature (second hot water set temperature). 51 and 52 are provided, respectively, and hot water of a bath set temperature (second hot water supply set temperature) is supplied to the bathtub 6 by a hot water amount set by a hot water amount setting switch (not shown) of the bath remote controller 7. Bath automatic switches 53 and 54 that are stretched and kept warm for a predetermined time are respectively provided.

  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 (first hot water set temperature) and bath set temperature (second hot water set temperature). It is what you are doing.

  The hot water supply control unit 55 detects the temperature of the hot water supply temperature sensor 40 at a temperature several degrees higher than the hot water supply set temperature (first hot water set temperature), here 3 ° C. or more, for a predetermined time or more, here 5 seconds or more. (First mixing valve) 37 is determined to have failed on the high temperature side, a high temperature side failure error of hot water supply mixing valve 37 is output, and each remote controller 5, 7 displays an error on the high temperature side failure of hot water supply mixing valve 37. The hot water mixing valve 30 is squeezed on the side of the hot water pipe 8 to reduce hot water hot water, and the hot water is preferentially controlled from the hot water hot water pipe 29 side so as to discharge hot water with no danger of burns. is there.

  On the other hand, the hot water supply control unit 55 detects a temperature that is several degrees lower than the hot water supply set temperature (first hot water set temperature), here -3 ° C. or more, for a predetermined time or more, here 5 seconds or more. (First mixing valve) 37 is determined to have failed on the low temperature side, a low temperature side failure error of hot water supply mixing valve 37 is output, and each remote controller 5, 7 displays an error of low temperature side failure of hot water supply mixing valve 37. The normal warm water mixing valve 30 is not fixedly controlled because there is no risk of burns even under normal control.

  Furthermore, the hot water supply control unit 55 detects the temperature that the hot water temperature sensor 45 is several degrees higher than the bath set temperature (second 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 (second mixing valve) 41 has failed on the high temperature side, a high temperature side failure error of the bath mixing valve 41 is output, and each remote controller 5, 7 displays an error of the high temperature side failure of the bath mixing valve 41. The hot water mixing valve 30 is squeezed on the side of the hot water pipe 8 to reduce hot water hot water, and the hot water is preferentially controlled from the hot water hot water pipe 29 side so as to discharge hot water with no danger of burns. is there.

  Furthermore, the hot water supply control unit 55 detects the temperature that the hot water filling temperature sensor 45 is several degrees lower than the bath set temperature (second 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 mixing valve (second mixing valve) 41 has failed on the low temperature side, a low temperature side failure error of the bath mixing valve 41 is output, and an error display of the low temperature side failure of the bath mixing valve 41 is displayed on each remote controller 5, 7. In addition, since there is no risk of burns even under normal control, the middle temperature water mixing valve 30 is not fixedly controlled.

  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 pipe 8 and sets the hot water set temperature (first temperature) set by the hot water remote controller 5 or the bath remote controller 7 at the hot water mixing valve 30. The intermediate temperature water mixing valve 30 is adjusted to an appropriate ratio so that the temperature is higher than a certain temperature by 1 hot water supply set 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 (first hot water supply set temperature), the outlet hot water pipe 8 side of the intermediate temperature water mixing valve 30 is closed.

  And the hot water which flowed out from the intermediate temperature water mixing valve 30 flows into the hot water supply mixing valve (first mixing valve) 36 through the first hot water discharge pipe 31, and is mixed with the low temperature water from the first bypass pipe 38, and the hot water supply control section. 55 adjusts the mixing ratio of the hot water supply mixing valve (first mixing valve) 36, and hot water at a hot water supply set temperature (first hot water set temperature) is supplied from the hot water tap 4. 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.

  Further, since the intermediate warm water mixing valve 30 supplies hot water having a temperature higher than a predetermined hot water supply temperature (first hot water supply set temperature) to the first hot water discharge pipe 31, the first intermediate warm water hot water outlet 34 is provided. When the temperature of the hot water discharged from the second intermediate hot water outlet 35 is lower than the hot water supply set temperature (first hot water supply set temperature), the mixing ratio of the intermediate hot water mixing valve 30 is controlled by the hot water supply control unit 55 as shown in FIG. Is adjusted so that hot water having a constant temperature higher than the hot water supply set temperature (first hot water set temperature) is supplied to the first hot water discharge pipe 31 using the high temperature water from the hot water discharge pipe 8, and the intermediate position of the hot water storage tank 2 Priority is given to the hot water from the hot water, the use of the high temperature water stored in the upper part of the hot water storage tank 2 is minimized, and more hot water as a heat source can be secured.

  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 hot water mixing valve 30 is adjusted to an appropriate ratio so that the temperature is higher than a certain temperature by a bath set temperature (second hot water 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 hot and higher than the bath set temperature (second hot water 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. And the high temperature water from the 2nd hot water pipe 42 flows into the bath mixing valve (2nd mixing valve) 41, is mixed with the low temperature water from the 2nd bypass pipe 43, and the hot water supply control part 55 carries out the bath mixing valve (2nd mixing valve). The mixing ratio of the valve 41 is adjusted, and hot water at the bath setting temperature (second hot water supply setting temperature) is filled from the hot water 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. Is set to a temperature that is higher by a certain temperature than the hot water supply set temperature (first hot water supply set 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 (second hot water supply 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. The hot water taken out from the hot water outlet pipe 20 is caused to flow into the heat exchanger 19 to exchange heat with the secondary-side bathtub 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.

  On the secondary side, the bathtub 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 is the bath set temperature (second hot water set temperature). ), The hot water supply control 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 (first hot water supply set temperature), the mixing ratio of the intermediate hot water mixing valve 30 is adjusted and the upper end of the hot water storage tank 2 is adjusted. The hot water is mixed with the hot water from the hot water discharge pipe 8 and supplied at a temperature higher than the preset hot water supply temperature.

  And the hot water which flowed out from the intermediate temperature water mixing valve 30 flows into the hot water supply mixing valve (first mixing valve) 36 through the first hot water discharge pipe 31, and is mixed with the low temperature water from the first bypass pipe 38, and the hot water supply control section. 55 adjusts the mixing ratio of the hot water supply mixing valve (first mixing valve) 36, and hot water at a hot water supply set temperature (first hot water set temperature) is supplied from the hot water tap 4. 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.

  Further, since the intermediate warm water mixing valve 30 supplies hot water having a temperature higher than a predetermined hot water supply temperature (first hot water supply set temperature) to the first hot water discharge pipe 31, the first intermediate warm water hot water outlet 34 is provided. When the temperature of the hot water discharged from the second intermediate hot water outlet 35 is lower than the hot water supply set temperature (first hot water set temperature), the mixing ratio of the intermediate hot water mixing valve 30 is adjusted by the hot water control unit 55 and the hot water pipe Hot water at a constant temperature higher than the hot water supply set temperature (first hot water set temperature) is supplied to the first hot water discharge pipe 31 using the high temperature water from 8, and the hot water from the intermediate position of the hot water storage tank 2 is given priority. It is possible to minimize the use of high-temperature water stored in the upper part of the hot water storage tank 2 and 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 the hot water supply operation is started during the hot water filling operation, the hot water supply control unit 55 performs the hot water supply set temperature (first hot water supply set temperature). ) And the bath set temperature (second hot water supply set temperature), and a temperature higher than the higher temperature by a certain 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 and FIGS. 8 to 10, when the hot water supply mixing valve (first mixing valve) 37 is locked on the high temperature side and fails during hot water supply, as shown in the flowchart of FIG. At 60, it is determined whether the hot water temperature detected by the hot water temperature sensor 40 is equal to or higher than the hot water supply set temperature (first hot water set temperature) + 3 ° C. If YES, the process proceeds to step 61, and this continues for 5 seconds or more to prevent false detection. If it is determined that the hot water supply mixing valve (first mixing valve) 37 has failed on the high temperature side and the hot water supply control unit 55 outputs a high temperature side failure error of the hot water mixing valve 37, the process proceeds to step 62. In step 63, the remote controller 5 and 7 display a hot water side failure error of the hot water mixing valve 37, and the process proceeds to step 63 where the intermediate hot water mixing valve 30 is squeezed on the side of the hot water outlet 8 and fixed control is given priority on the intermediate hot water hot water outlet pipe 29 side. Of burns Ken warm water many can pouring in without, moreover COP (energy consumption efficiency) is also one in which it can be achieved.

  Further, if the hot water supply mixing valve (first mixing valve) 37 is locked on the high temperature side and fails, NO is determined in step 60, and the process proceeds to step 64 to determine whether the hot water supply set temperature (first hot water set temperature) is −3 ° C. or less. If YES, the process proceeds to step 65, and it is determined whether this has continued for 5 seconds or more, and if YES, it is determined that the hot water supply mixing valve (first mixing valve) 37 has failed on the low temperature side. Outputs the low temperature side failure error of the hot water supply mixing valve 37, and proceeds to step 66 to cause each of the remote controllers 5 and 7 to display only the low temperature side failure error of the hot water supply mixing valve 37. On the low temperature side, there is a risk of burns. Since there is no error, only the error display is performed, and the fixed control of the intermediate hot water mixing valve 30 is not performed and the normal control is performed.

  Next, as shown in FIGS. 6 and 10, when the bath mixing valve (second mixing valve) 41 is locked on the high temperature side and malfunctions during bath filling, as shown in the flowchart of FIG. It is determined whether the hot water temperature detected by the hot water temperature sensor 45 is higher than the bath set temperature (second hot water supply set temperature) + 3 ° C. If YES, the process proceeds to step 68, and is this continued for 5 seconds or longer to prevent false detection? If the bath mixing valve (second mixing valve) 41 has failed on the high temperature side and the hot water supply control unit 55 outputs a high temperature side failure error of the bath mixing valve 41, the process proceeds to step 69. The remote controller 5 or 7 displays a high-temperature failure error of the bath mixing valve 41, and proceeds to step 70 to squeeze the hot water mixing valve 30 on the side of the hot water pipe 8 and give priority to the hot water hot water outlet pipe 29 side for fixed control. Danger of burns done Hot water many can pouring in without, moreover COP (energy consumption efficiency) is also one in which it can be achieved.

  Further, when the bath mixing valve (second mixing valve) 41 is locked on the high temperature side and fails, NO is determined in step 67, and the flow proceeds to step 71 to determine whether the bath set temperature (second hot water supply set temperature) is −3 ° C. or less. If YES, the process proceeds to step 72, and it is determined whether this has continued for 5 seconds or more to prevent erroneous detection. If YES, it is determined that the bath mixing valve (second mixing valve) 41 has failed on the low temperature side. Outputs the low temperature side failure error of the bath mixing valve 41, and proceeds to step 73 to cause each of the remote controllers 5 and 7 to display only the low temperature side failure error of the bath mixing valve 41. On the low temperature side, there is a risk of burns. Since there is no error, only the error display is performed, and the fixed control of the intermediate hot water mixing valve 30 is not performed and the normal control is performed.

  Next, other embodiments shown in the flowcharts of FIGS. 13 and 14 will be described. However, the same parts in FIGS. 11 and 12 are denoted by the same reference numerals and description thereof is omitted, and only the different parts will be described. In step 74, the hot water supply control unit 55 controls the hot water mixing valve 30 so as to close the hot water discharge pipe 8 side and fix the intermediate hot water hot water discharge pipe 29 side fully open, and the hot water supply mixing valve (first mixing valve) 37 or If the bath mixing valve (second mixing valve) 41 breaks down on the high temperature side, the hot water side is completely closed and only the medium temperature water is used to reliably avoid the risk of burns, placing importance on safety over ease of use. It is what I did.

  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 the hot water supply mixing valve (1st mixing valve) fails during the hot water supply operation of the same embodiment. The flowchart when a bath mixing valve (2nd mixing valve) fails during the bath operation of the same embodiment. The flowchart when the hot water supply mixing valve (1st mixing valve) fails during the hot water supply driving | operation of other embodiment. The flowchart when a bath mixing valve (2nd mixing valve) fails during the bath operation of other embodiment.

Explanation of symbols

2 Hot water storage tank 4 Hot water tap (first hot water supply end)
8 Hot water pipe 9 Water supply pipe 16 Heat pump circuit (heating means)
29 Medium-temperature water tap pipe 30 Medium-temperature water mixing valve 37 Hot-water supply mixing valve (first mixing valve)
38 First bypass pipe 41 Bath mixing valve (second mixing valve)
43 Second bypass pipe 44 Hot water filling pipe (second hot water supply end)

Claims (2)

A hot water storage tank having a hot water tank connected to the upper end, a hot water storage tank connected to the lower end of the hot water stored in the hot water, and a heating means for heating the hot water in the hot water storage tank to a high temperature. Intermediate temperature water mixing pipe for mixing medium temperature water from the hot water storage tank, high temperature water from the discharge pipe and medium temperature water from the intermediate temperature water discharge pipe to any given temperature A hot water mixed by the valve, the hot water mixing valve and the low-temperature water from the first bypass pipe branched from the water supply pipe are mixed at an arbitrary first hot water supply set temperature to supply hot water from the first hot water supply end. 1 mixing valve, hot water mixed by the intermediate temperature water mixing valve and low temperature water from the second bypass pipe branched from the water supply pipe are mixed at an arbitrary second hot water supply set temperature to supply hot water from the second hot water supply end. With a second mixing valve Serial The failure of the first mixing valve or fewer or either the low temperature side of the second mixing valve, with a normal control, the failure of the high-temperature side, the hot water tapping in squeezing the hot water pipe side medium hot water mixing valve Hot water storage hot water supply system characterized by priority control on the pipe side. A hot water storage tank having a hot water tank connected to the upper end, a hot water storage tank connected to the lower end of the hot water stored in the hot water, and a heating means for heating the hot water in the hot water storage tank to a high temperature. Intermediate temperature water mixing pipe for mixing medium temperature water from the hot water storage tank, high temperature water from the discharge pipe and medium temperature water from the intermediate temperature water discharge pipe to any given temperature A hot water mixed by the valve, the hot water mixing valve and the low-temperature water from the first bypass pipe branched from the water supply pipe are mixed at an arbitrary first hot water supply set temperature to supply hot water from the first hot water supply end. 1 mixing valve, hot water mixed by the intermediate temperature water mixing valve and low temperature water from the second bypass pipe branched from the water supply pipe are mixed at an arbitrary second hot water supply set temperature to supply hot water from the second hot water supply end. With a second mixing valve Serial The failure of the first mixing valve or fewer or either the low temperature side of the second mixing valve, with a normal control, the failure of the high-temperature side, medium-temperature water tapping the medium-temperature water mixing valve in hot water tube occlusion Hot water storage type hot water supply device characterized by the tube side being fully open.

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