JP2005049094A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the reduction in size and energy saving of a hot water storage tank, to improve the convenience by ensuring a stable hot water supply temperature even in simultaneous use with different hot water supply temperatures at a terminal, and to promote the build up of hot water supply temperature at the terminal. <P>SOLUTION: This water heater comprises a plurality of mixing valves 17 for mixing hot water taken from a hot water storage tank 5 for storing hot water heated through a heat source with water and automatically adjusting it to an optional hot water temperature, and a hot water supply temperature setting means 21 for setting the hot water supply temperature at the terminal. The mixing valves 17 are provided in a plurality of hot water supply passages, respectively, and hot water is reduced to a predetermined temperature by each mixing valve and then guided to the terminal. The mixing valve adjusts the hot water temperature so as to supply hot water of a temperature higher than the temperature set by the setting means 21 just after hot water supply, and then controls the temperature so as to be gradually matched to the temperature set by the setting means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a water heater.

  A conventional heat pump water heater is shown in Japanese Patent Laid-Open No. 1-225838 (Patent Document 1) as a first conventional example. In FIG. 13, a refrigerant circuit comprising a compressor 1, a condenser 2, a decompression device 3, and an evaporator 4, a hot water tank 5, a circulation pump 6, a hot water supply circuit connected to the condenser 2, and an upper part in the hot water tank 1 The heater 7 provided in the hot water tank 5, the hot water mixing device 8 connected from the upper part and the center part of the hot water tank 5, and the electric on-off valve 9. The heater 7 heats the upper part of the hot water storage tank 5 to high-temperature hot water using boiling power and midnight power. Normally, the electric on-off valve 9 is closed and low temperature hot water is used from the central portion of the hot water tank 5 through the hot water mixing device 8. When high temperature hot water is required, the electric on-off valve 9 is opened to generate high temperature heat. Is used via a hot and cold mixing device 8.

Further, as a second conventional example, there is one as shown in Japanese Patent Laid-Open No. 4-6345 (Patent Document 2) in which a hot water mixing device 8 is provided at the outlet of the hot water tank 5. In FIG. 14, the hot water boiled by the heater 10 built in the hot water tank 5 and the feed water from the pressure reducing valve 11 are connected to the hot water / mixing device 8, and hot water adjusted to an appropriate temperature by the hot water / mixing device 8 is poured into the bathtub. .
JP-A-1-225838 Japanese Patent Laid-Open No. 4-6345

  However, in the first conventional example, when hot water is discharged, the hot water remains in the pipe to the terminal (faucet) after stopping the hot water, and heat is radiated from the pipe with the passage of time, resulting in a temperature drop. That is, since heat dissipation loss occurs, it is necessary to boil off the heat dissipation amount. Also, when mixing the hot water and city water at the terminal to make the temperature suitable, it takes time to adjust the temperature and wastes the hot water. Accordingly, the hot water tank capacity increases and the energy required for boiling increases. Therefore, it has problems in terms of installation space, energy saving, and convenience during hot water.

  This invention solves such a conventional subject, and aims at achieving size reduction and energy saving of a hot water tank. Another object of the present invention is to obtain a stable tapping temperature even when used at different tapping temperatures at the same time on the terminal, thereby improving convenience. Furthermore, it aims at quick start-up of the tapping temperature in a terminal.

  In order to achieve the above object, the present invention provides a hot water storage tank for storing hot water heated via a heat source, and a plurality of hot water and water extracted from the hot water storage tank to automatically adjust any hot water temperature. The mixing valve and a tapping temperature setting means for setting the tapping temperature of the terminal. The mixing valve is provided in each of a plurality of tapping paths, and guides the hot water after being lowered to a predetermined temperature by each mixing valve. At the same time, the mixing valve is adjusted so that hot water higher than the temperature set by the hot water temperature setting means is discharged immediately after the hot water, and then gradually matches the set temperature of the hot water temperature setting means. The water heater is controlled as follows.

  A hot water tank for storing hot water heated through a heat source; hot water to be taken out from the hot water tank; a plurality of mixing valves for adjusting water temperature by mixing water; and hot water in the hot water tank A plurality of hot water amount detecting means for detecting the temperature of the water, and the mixing valve is provided in each of a plurality of hot water discharge paths, and guides the hot water after being lowered to a predetermined temperature by each mixing valve to the terminal, and The hot water supply device performs temperature setting of the hot water temperature setting means based on a signal from the hot water amount detection means.

  The hot water supply apparatus of the present invention can obtain a stable hot water temperature even when selecting an operation pursuing hot water supply load and economy regardless of the remaining hot water temperature, and reduces the heat loss of the piping system to the terminal device, thereby reducing the hot water storage tank. Downsizing and energy saving.

  In addition, a plurality of mixing valves adjust and supply the hot water temperature according to the request from each terminal. Therefore, even if the hot water discharge and the hot water stop are performed at different hot water temperatures at each terminal, the hot water temperature is stabilized, and convenience is improved. Moreover, the start-up of the hot water temperature in a terminal can be accelerated.

  The first invention is a hot water storage tank for storing hot water heated via a heat source, a plurality of mixing valves for automatically adjusting any hot water temperature by mixing hot water and water extracted from the hot water storage tank, Hot water temperature setting means for setting the hot water temperature of the terminal, and the mixing valve is provided in each of a plurality of hot water paths, and guides the hot water after being lowered to a predetermined temperature by each mixing valve to the terminal, Immediately after pouring hot water, the mixing valve is adjusted so that hot water having a temperature higher than the temperature set by the hot water temperature setting means is discharged, and then controlled so as to coincide with the set temperature of the hot water temperature setting means. It is what.

  The second invention is a refrigerant circuit having a compressor, and a water circuit that is arranged for circulating hot water in a hot water tank, and is connected to a water heat exchanger that exchanges heat with the refrigerant circuit. , The hot water in the hot water tank is forced to circulate in the water circulation path, the hot water heated by the water heat exchanger is stored in the hot water tank, the hot water taken out from the hot water tank, and water can be mixed to form any A plurality of mixing valves for adjusting the hot water temperature, and the mixing valves are provided in a plurality of hot water discharge paths, respectively, to guide the hot water after being lowered to a predetermined temperature by each mixing valve to the terminal, Immediately after that, the mixing valve is adjusted so that hot water having a temperature higher than the temperature set by the tapping temperature setting means is discharged, and then gradually matches the set temperature of the tapping temperature setting means. It is an cormorants control the water heater.

  According to these first and second inventions, the hot water temperature of the terminal is set by the hot water temperature setting means. Then, immediately after pouring, the controller sends a signal of hot water slightly higher than the signal of the hot water temperature setting means to the mixing valve, and then sends a signal that matches the signal of the hot water temperature setting means. Therefore, it is quick to start the hot water discharged from the terminal.

  A third invention includes a hot water storage tank for storing hot water heated via a heat source, hot water to be taken out from the hot water storage tank, a plurality of mixing valves for mixing water to arbitrarily adjust hot water temperature, and the hot water storage A plurality of hot water detection means for detecting the temperature of hot water in the tank, and the mixing valve is provided in each of a plurality of hot water discharge paths so that the hot water after being lowered to a predetermined temperature by each mixing valve is guided to the terminal. At the same time, the water heater is configured to set the temperature of the hot water temperature setting means based on the signal from the hot water amount detection means.

  A fourth aspect of the invention is a refrigerant circulation circuit having a compressor, a water circulation path that is arranged for hot water circulation in a hot water tank, and that is connected to a water heat exchanger that exchanges heat with the refrigerant circulation circuit. The hot water in the hot water tank is forcibly circulated in the water circulation path, the hot water heated by the water heat exchanger is stored in the hot water tank, the hot water taken out from the hot water tank, and water are mixed to form any hot water. A plurality of mixing valves for adjusting the temperature and a plurality of hot water amount detecting means for detecting the temperature of the hot water in the hot water storage tank, wherein the mixing valves are provided in a plurality of hot water discharge paths, respectively. The hot water after being lowered to the terminal is led to the terminal, and the hot water temperature setting means sets the temperature of the hot water temperature setting means based on the signal of the hot water amount detection means.

  According to these third and fourth inventions, the hot water amount detecting means detects the remaining hot water amount in the hot water storage tank immediately before the start of the boiling operation, and sends a signal to the controller. And when there is more than the amount of remaining hot water of the previous day, the temperature setting of a hot water temperature setting means is made low. Conversely, when the amount of remaining hot water is small, the temperature setting is increased. Then, the boiling operation is started, and the rotation speed controller controls the rotation speed of the circulation pump so that the signal of the temperature detector matches the signal of the hot water temperature setting means, and the water is heated to the set temperature. And even if the remaining hot water temperature and the boiling temperature are different, the temperature is lowered to an appropriate temperature by the mixing valve and sent to the terminal device, so the hot water temperature at the terminal is stable. Accordingly, the hot water temperature can be automatically set according to the amount of hot water used. In addition, there is little heat dissipation from the hot water tank, and the hot water temperature is stabilized.

  5th invention has a pressure-reduction valve which pressure-reduces the water supplied to the lower part of a hot water storage tank, and comprised so that the water pressure-reduced by the said pressure reduction valve might be supplied to each mixing valve Or a water heater according to item 1.

  Further, according to the first to fifth inventions, when the hot water used is different, such as hot water in the kitchen and hot water for bathing (chairing), and when the hot water is discharged at the same time, the plurality of mixing valves are connected to each terminal. Adjust and supply hot water according to the demand from Therefore, even if the hot water is stopped and the hot water is stopped at each terminal, the hot water temperature is stabilized, and convenience is improved.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIG. In FIG. 1, 1 is a compressor, 2 is a condenser, 3 is a decompression device, 4 is an evaporator, and the compressor 1, the condenser 2, the decompression device 3, and the evaporator 4 are sequentially connected, A refrigerant circulation circuit is configured. 5 is a hot water storage tank, 12 is a circulation pump, 13 is a water heat exchanger, and performs heat exchange with the condenser 2. The circulation pump 12 and the water heat exchanger 13 constitute a water circulation path that communicates the lower and upper portions of the hot water tank 5. Reference numeral 14 denotes a temperature detector, which is provided at the outlet of the water heat exchanger 13 and detects a medium temperature to generate a signal. 15 is a hot water temperature setting means for setting the boiling hot water temperature and having a plurality of signals. Reference numeral 16 denotes a rotation speed controller, which controls the rotation speed of the circulation pump 12 so that the signal from the temperature detector 14 matches the signal from the hot water temperature setting means 15. A mixing valve 17 mixes hot water taken out from the upper part of the hot water tank 5 and water supplied to the lower part of the hot water tank 5 after being depressurized by the pressure reducing valve 11 to arbitrarily adjust the hot water temperature.

  Next, the operation in the above configuration will be described. When the hot water supply load is large, the hot water temperature setting means 15 performs boiling hot water setting, and when the hot water load is small, the medium hot water boiling setting is performed. The high-temperature and high-pressure superheated gas discharged from the compressor 1 flows into the condenser 2, and heats the water that is sent from the circulation pump 12 and flows into the water heat exchanger 13. At that time, it is condensed and liquefied by heat radiation action and flows into the decompression device 3, where it is decompressed and flows into the evaporator 4. Then, it absorbs atmospheric heat to evaporate and returns to the compressor 1. On the other hand, water flowing out from the lower part of the hot water tank 5 flows into the water heat exchanger 13 through the circulation pump 12, heated by the condensation heat of the refrigerant, and stored in the upper part of the hot water tank 5. While repeating this operation, the entire hot water is gradually stored from the upper part of the hot water tank 5. In this case, when the hot water boiling operation is performed to the place where the hot water of the previous day boiled by the heat pump is present, the hot water is stored above the remaining hot water of the previous day. That is, hot water layers having different temperatures are stored in the hot water storage tank 5. That is, temperature stratified hot water storage is performed. When the hot water is discharged from the hot water storage tank 5, the mixing valve 17 mixes high temperature hot water and tap water, lowers the hot water temperature used at the terminal and sends it to the terminal device, so that the hot water temperature at the terminal is stable. ing. Therefore, even if the remaining hot water temperature and the boiling temperature are different, it is possible to select an operation that pursues hot water supply load and economy. Moreover, since the heat loss of the piping system to the terminal equipment is reduced, the hot water tank can be reduced in size and energy can be saved. Further, it is not necessary to adjust the hot water temperature at the terminal, and convenience is improved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In FIG. 2, the same configuration and operation as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 18 denotes a hot water amount detecting means, which is provided in the hot water storage tank 5 and detects the temperature of the hot water in the hot water storage tank and generates a signal. Reference numeral 19 denotes a controller which sets the temperature of the hot water temperature setting means 15 based on the signal from the hot water amount detection means 18.

  Next, the operation in the above configuration will be described. Immediately before the start of the boiling operation, the controller 19 sets the set temperature of the hot water temperature setting means 15 from the detection signal of the remaining hot water quantity of the plurality of hot water quantity detection means 18 provided in the hot water storage tank 5. That is, when the amount of remaining hot water is greater than the previous day, the temperature setting of the hot water temperature setting means 15 is lowered. Conversely, when the amount of remaining hot water is small, the temperature setting is increased. Control of the set temperature of the hot water temperature setting means 15 by the controller 19 is performed by changing the temperature set by the initial hot water temperature setting means 15 (for example, changing the temperature setting of 65 ° C. to 50 ° C.) Alternatively, the set temperature of the hot water temperature setting means 15 may be automatically determined based on the amount of hot water detected by the hot water amount detection means 18. Then, the boiling operation is started, and the rotational speed controller 16 controls the rotational speed of the circulating pump 12 so that the signal of the temperature detector 14 coincides with the signal of the hot water temperature setting means 15 to set the set temperature. To boil. Then, the mixing valve 17 lowers the temperature to an appropriate temperature and sends it to the terminal device. Therefore, the hot water temperature at the terminal is stable even if the remaining hot water temperature and the boiling temperature are different, so that the hot water temperature can be automatically set according to the amount of hot water used.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. In FIG. 3, the same configuration and operation as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted. Reference numeral 20 denotes a plurality of mixing valves, each of which adjusts hot water temperature arbitrarily by mixing hot water taken out from the upper part of the hot water storage tank 5 and water depressurized by the pressure reducing valve 11 and supplying water to the plurality of mixing valves 20.

  Next, the operation in the above configuration will be described. When the hot water heated in the hot water storage tank 5 is discharged at the same time under different conditions, such as in the kitchen and bathing, the plurality of mixing valves 20 are in response to requests from the terminal. Adjust to the appropriate hot water temperature and supply. Therefore, even if the hot water discharge and the hot water stop are performed at different hot water temperatures at each terminal, the hot water temperature is stabilized, and convenience is improved.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. In FIG. 4, the same configuration and operation as those of the first, second, and third embodiments are denoted by the same reference numerals, and the description thereof is omitted. 21 is a tapping temperature setting means for setting the tapping temperature of the terminal. A controller 22 sends a signal to the mixing valve 17 that matches the signal from the hot water temperature setting means 21 gradually from the hot water temperature signal from the hot water temperature setting means 21 at the time of hot water.

  Next, the operation in the above configuration will be described. The hot water temperature setting means 21 sets the hot water temperature of the terminal. Then, immediately after pouring, the controller 22 sends a signal of hot water slightly higher than the signal of the hot water temperature setting means 21 to the mixing valve 17, and then sends a signal that matches the signal of the hot water temperature setting means 21. . Therefore, it is not easy to start up the hot water discharged from the terminal.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. In FIG. 5, the same configuration and operation as those of the first, second, third, and fourth embodiments are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 23 denotes a heater, which is provided downstream of the water heat exchanger 13. A hot water amount detecting means 24 is provided in the hot water storage tank 5. A heating controller 25 energizes the heater 23 in response to a signal from the hot water detection means 24. Reference numeral 26 denotes a time accumulating means for accumulating the energization time of the heater 23 in response to the signal from the hot water detection means 24. Reference numeral 27 denotes storage means for storing the previous time integration means 26. 28 is a hot water amount comparing means, which compares the signal of the hot water amount detecting means 24 immediately before the start of operation and transmits a change signal of the hot water amount above a certain temperature. 29 is an operation time control means, and sets the energization time of the heater 23 from the storage means 27 and the hot water amount comparison means 28.

  Next, the operation in the above configuration will be described. Immediately before the start of the boiling operation, the hot water amount detecting means 24 detects the remaining hot water amount in the hot water storage tank 5 and sends a signal to the hot water amount comparing means 28. Then, the previous remaining hot water amount is compared with the current remaining hot water amount, and a signal is transmitted to the operation time control means 29. In addition, the storage means 27 transmits a previous energization time signal of the heater 23 to the operation time control means 29. The operation time control means 29 sets the energization time of the heater 23 during the current boiling operation from the signals of the storage means 27 and the hot water amount comparison means 28. That is, the amount of remaining hot water of the previous day and today is compared, and when the amount of remaining hot water is large, the energization time of the heater 23 is set to be small. Conversely, when the amount of remaining hot water is small, the energization time is set to be long. Then, the boiling operation is started, and the heated hot water is sequentially stored from the upper part of the hot water tank 5 by the heat pump using the compressor 1. When hot water is stored up to the position of the hot water detection means 24, the hot water detection means 24 sends a signal to the heating controller 25, and the heater 23 is energized. The time integration means 26 integrates the energization time of the heater 23 and is energized until the energization time set by the operation time control means 29. The hot water tank 5 stores hot water at different temperatures, but the mixing valve 17 mixes hot water taken out from the upper part of the hot water tank 5 and water supplied to the lower part of the hot water tank 5 at the terminal. Stable hot water temperature can be obtained because it is sent to the terminal equipment after being lowered to the hot water temperature used. Moreover, since the amount of boiling hot water can be varied according to the amount of hot water used, power consumption can be reduced.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIG. In FIG. 6, the same configuration and operation as those of the first, second, third, fourth, and fifth embodiments are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 30 denotes a chasing driving means for manually setting chasing operation. An operation controller 31 receives the signal from the reheating operation means 30 and performs the combined operation of the compressor 1 and the heater 23.

  Next, the operation in the above configuration will be described. When a large amount of hot water is urgently needed, the operation controller 31 energizes the compressor 1 and the heater 23 in response to a signal from the reheating operation means 30, and performs a combined operation. Therefore, the reheating operation can be performed with a high heating capacity. Further, even when reheating is performed at a temperature different from the remaining hot water temperature in the hot water storage tank 5, the mixing valve 17 is lowered to the hot water temperature used at the terminal and sent to the terminal device when the hot water is discharged. Accordingly, shortening of the boiling time and stabilization of the tapping temperature can be achieved.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described with reference to FIG. In FIG. 7, the same configurations and operations as those of the first, second, third, fourth, fifth, and sixth embodiments are denoted by the same reference numerals, and description thereof is omitted. A mixing valve 32 mixes hot water taken out from the hot water storage tank 5 and water supplied to the lower part of the hot water storage tank 5 to arbitrarily adjust the hot water temperature, and detects a temperature and transmits a signal. An operation controller 33 compares the signal of the mixing valve 32 with the signal of the tapping temperature setting means 21 and energizes the compressor 1 and the heater 23.

  Next, the operation in the above configuration will be described. When hot water is started, the mixing valve 32 detects the hot water temperature and sends a signal to the operation controller 33. The operation controller 33 compares the signal from the mixing valve 32 with the signal from the tapping temperature setting means 21. When the remaining hot water amount decreases and the hot water temperature starts to decrease, the signal of the mixing valve 32 transmits a signal lower than the signal of the hot water temperature setting means 21. Recognizing this, the operation controller 33 energizes the compressor 1 and the heater 23 to perform a combined operation. Therefore, since the reduction of the remaining hot water amount is automatically detected and the reheating operation is automatically performed with a high heating capacity, it is possible to improve convenience and prevent hot water from running out.

(Eighth embodiment)
Next, an eighth embodiment of the present invention will be described with reference to FIG. In FIG. 8, the same configuration and operation as those of the first, second, third, fourth, fifth, sixth, and seventh embodiments are denoted by the same reference numerals, and description thereof is omitted. A controller 34 detects the signal of the mixing valve 32 and switches the signal of the hot water temperature setting means 15 to be equal to the signal of the hot water temperature setting means 21.

  Next, the operation in the above configuration will be described. The temperature of the outlet medium of the water heat exchanger 13 is detected by the temperature detector 14, and the rotational speed controller 16 detects the rotational speed of the circulating pump 12 so that the signal coincides with the signal of the hot water temperature setting means 15. Carry out driving while controlling. When the hot water starts during the reheating operation, the mixing valve 32 detects the hot water temperature and sends a signal to the controller 34. The controller 34 compares the signal from the mixing valve 32 with the signal from the tapping temperature setting means 21. When the remaining hot water amount decreases and the hot water temperature starts to decrease, the controller 34 switches the signal of the hot water temperature setting means 15 to coincide with the signal of the hot water temperature setting means 21. Therefore, the rotation speed controller 16 controls the rotation speed of the circulation pump 12 so that the outlet medium temperature of the water heat exchanger 13 matches the signal of the tapping temperature setting means 21. Therefore, the hot water boiled in the water heat exchanger 13 has the same temperature as the hot water temperature and is discharged as it is.

(Ninth embodiment)
Next, a ninth embodiment of the present invention will be described with reference to FIG. In FIG. 9, the same configurations and operations as those of the first, second, third, fourth, fifth, sixth, seventh, and eighth embodiments are denoted by the same reference numerals, and description thereof is omitted. 35 is a hot water amount detection means, which is provided in the hot water storage tank 5 and detects a temperature and transmits a signal. An operation controller 36 receives the signal from the hot water detection means 35 and energizes the compressor 1 to perform an independent operation using a heat pump.

  Next, the operation in the above configuration will be described. When the hot water is discharged from the hot water tank 5, the hot water level is pushed upward, and when the hot water level reaches the position of the hot water level detection means 35, the hot water level detection means 35 sends a signal to the operation controller 36, and the compression Energize the machine 1 and perform a single operation with a heat pump. And since the mixing valve 17 is lowered to the hot water temperature to be used and sent to the terminal device, the hot water temperature is stabilized even if the remaining hot water temperature differs from the reheating temperature. Therefore, it becomes possible to perform a reheating operation with power saving.

(Tenth embodiment)
Next, a tenth embodiment of the present invention will be described with reference to FIG. In FIG. 10, the same configuration and operation as those of the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth embodiments are denoted by the same reference numerals, and description thereof is made. Omitted. Reference numeral 37 denotes a heater, which is provided in the middle of the hot water supply circuit above the water heat exchanger 13 and the hot water storage tank 5, and is composed of a plurality of heaters and the like, and the output can be varied. Reference numeral 38 denotes a first temperature detector which is provided at the outlet of the water heat exchanger 13 and detects the temperature of the medium flowing therethrough to generate a signal. A second temperature detector 39 is provided at the outlet of the heater 37, detects the temperature of the medium flowing therethrough, and generates a signal. Reference numeral 40 denotes a rotation speed controller which receives the signal from the first temperature detector 38 and controls the rotation speed of the circulation pump 12. Reference numeral 41 denotes a controller that controls the output of the heater 37 in response to a signal from the second temperature detector 39.

  Next, the operation in the above configuration will be described. In the combined operation of the heat pump and the heater, the boiling water temperature in the heat pump, that is, the outlet water temperature of the water heat exchanger 13 is detected by the first temperature detector 38, and the signal is sent to the rotation speed controller. 40, where the rotational speed of the circulating pump 12 is controlled so that the boiling water temperature in the heat pump becomes a predetermined temperature. During the operation, when the outlet temperature of the heater 37 becomes high, the second temperature detector 39 detects the hot water temperature and sends a signal to the controller 41 to reduce the output of the heater 37. Therefore, since the boiling water temperature in the heat pump during the combined operation is the same as that in the single operation of the heat pump, the boiling operation can be performed with high efficiency.

(Eleventh embodiment)
Next, an eleventh embodiment of the present invention will be described with reference to FIG. In FIG. 11, the same reference numerals are used for the same configuration and operation as the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth embodiments. The description is omitted. An open / close valve 42 is provided in a hot water supply circuit of the circulation pump 12 and the water heat exchanger 13. A controller 43 closes the on-off valve when the compressor 1 is stopped.

  Next, the operation in the above configuration will be described. Immediately after the operation is stopped, the hot water between the outlet of the water heat exchanger 13 that has become hot water during operation and the hot water storage tank 5 dissipates heat, the temperature decreases, and the density increases. The hot water tends to flow backward from the upper part of the hot water tank 5. However, since the controller 43 closes the on-off valve 42 when operation is stopped, natural circulation can be prevented. Therefore, the hot water in the hot water tank 5 does not flow back to the hot water supply circuit and does not radiate heat.

(Twelfth embodiment)
Next, a twelfth embodiment of the present invention will be described with reference to FIG. In FIG. 12, the same configuration and operation as the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, and eleventh embodiments are as follows. The same reference numerals are used, and description thereof is omitted.

  Reference numeral 44 denotes a heat source, which is built in the hot water tank 5 or provided in a water circulation path that connects the upper and lower parts of the hot water tank 5. 45 is a hot water amount detecting means, which is provided in the hot water storage tank 5 and detects a temperature to generate a signal. A human body recognition means 46 is provided in the bathroom, recognizes the human body, counts the number of persons, and generates a signal. An operation controller 47 controls the operation of the heat source 44 and the circulation pump 12 based on signals from the hot water detection means 45 and the human body recognition means 46.

  Next, the operation in the above configuration will be described. When the amount of hot water discharged from the hot water storage tank 5 reaches the position of the hot water amount detecting means 45, the hot water amount detecting means 45 sends a signal to the operation controller 47. The human body recognition means 46 is provided in the bathroom, counts the number of people taking a bath, and sends a signal to the operation controller 47. Then, the operation controller 47 selects whether or not to perform the chasing operation from the signal of the human body recognition means 46 when the signal of the hot water amount detection means 45 is received. For example, if it is the last bather, the remaining hot water amount at the position of the hot water amount detecting means 45 is sufficient, and the chasing operation is not performed. Therefore, power consumption can be saved in order to prevent unnecessary chasing operation. Then, the hot water tank is heated up at midnight when the electricity rate is cheap and the leveling of the power load is promoted.

  Whether or not it is the last bather is determined by first inputting the number of scheduled bathers.

The block diagram of the heat pump water heater of the 1st Embodiment of this invention The block diagram of the heat pump water heater of the 2nd Embodiment of this invention The block diagram of the heat pump water heater of the 3rd Embodiment of this invention The block diagram of the heat pump water heater of the 4th Embodiment of this invention The block diagram of the heat pump water heater of the 5th Embodiment of this invention The block diagram of the heat pump water heater of the 6th Embodiment of this invention The block diagram of the heat pump water heater of the 7th Embodiment of this invention The block diagram of the heat pump water heater of the 8th Embodiment of this invention The block diagram of the heat pump water heater of the 9th Embodiment of this invention The block diagram of the heat pump water heater of the 10th Embodiment of this invention The block diagram of the heat pump water heater of the 11th Embodiment of this invention The block diagram of the water heater of 12th Embodiment of this invention Configuration diagram of conventional heat pump water heater Configuration of a conventional water heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3 Pressure reducing device 4 Evaporator 5 Hot water storage tank 11 Pressure reducing valve 12 Circulating pump 13 Hydrothermal exchanger 14 Temperature detector 15 Hot water temperature setting means 16 Revolution controller 17 Mixing valve 18 Hot water quantity detecting means 19 Controller 20 Mixing valve 21 Hot water temperature setting means 22 Controller 23 Heater 24 Hot water amount detection means 25 Heating controller 26 Time accumulating means 27 Storage means 28 Hot water amount comparison means 29 Operating time control means 30 Reheating operation means 31 Operation controller 32 Mixing valve 33 Operation controller 34 Controller 35 Hot water amount detection means 36 Operation controller 37 Heater 38 First temperature detector 39 Second temperature detector 40 Rotational speed controller 41 Controller 42 Open / close valve 43 Controller 44 Heat source 45 Hot water amount detection means 46 Human body recognition means 47 Operation controller

Claims (5)

A hot water storage tank for storing hot water heated through a heat source, a plurality of mixing valves that automatically adjust hot water temperature by mixing hot water and water taken out from the hot water storage tank, and set the hot water temperature of the terminal The mixing valve is provided in each of a plurality of hot water paths, and guides the hot water after being lowered to a predetermined temperature by each mixing valve to the terminal. A hot water supply apparatus that adjusts the mixing valve so that hot water having a temperature higher than the temperature set by the setting means is discharged, and then gradually controls the mixing valve to match the set temperature of the hot water temperature setting means. A refrigerant circulation circuit having a compressor, a water circulation path arranged for hot water circulation in a hot water storage tank, and a water heat exchanger connected to the refrigerant circulation circuit in the middle, and a hot water tank in the water circulation path A circulating pump for forcibly circulating hot water of water and storing hot water heated by a water heat exchanger in a hot water storage tank, hot water taken out of the hot water storage tank, and water are mixed to adjust arbitrary hot water temperature. A mixing valve, and each mixing valve is provided in each of a plurality of hot water passages to guide the hot water after being lowered to a predetermined temperature by each mixing valve to the terminal, and immediately after the hot water, the hot water temperature setting means The water heater for adjusting the mixing valve so that hot water having a temperature higher than the temperature set by the hot water is discharged, and then gradually adjusting the mixing valve to match the set temperature of the hot water temperature setting means A hot water tank for storing hot water heated via a heat source, hot water to be taken out from the hot water tank, a plurality of mixing valves for adjusting water temperature by mixing water, and the temperature of the hot water in the hot water tank A plurality of hot water amount detecting means for detecting the hot water after the temperature has been lowered to a predetermined temperature by each mixing valve, and the mixing valve is provided in each of the plurality of hot water paths. A water heater for setting the temperature of the hot water temperature setting means based on the signal of the means. A refrigerant circulation circuit having a compressor, a water circulation path arranged for hot water circulation in a hot water storage tank, and a water heat exchanger connected to the refrigerant circulation circuit in the middle, and a hot water tank in the water circulation path A circulating pump for forcibly circulating hot water of water and storing hot water heated by a water heat exchanger in a hot water storage tank, hot water taken out of the hot water storage tank, and water are mixed to adjust arbitrary hot water temperature. A mixing valve and a plurality of hot water detection means for detecting the temperature of hot water in the hot water storage tank, the mixing valve being provided in each of a plurality of hot water discharge paths, after being lowered to a predetermined temperature by each mixing valve A hot water supply apparatus that guides hot water to a terminal and performs temperature setting of the hot water temperature setting means based on a signal from the hot water amount detection means. It has a pressure-reduction valve which pressure-reduces the water supplied to the lower part of a hot water tank, and was comprised so that the water pressure-reduced by the said pressure reduction valve might be supplied to each mixing valve. Water heater.

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