JP6127263B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus having a function of changing a hot water supply temperature of hot water supplied to a hot water supply terminal.

  Conventionally, this type of hot water supply device realizes a hot and cold shower that alternately supplies hot and cold hot water by mixing the water heated by the heating means and the water supplied by the heat exchanger and the water. Some of them have a function to perform (see, for example, Patent Document 1).

  FIG. 11 shows a hot water supply apparatus having a function of realizing a hot and cold shower, 51 is a heating means for heating the circulating heat medium, and 52 is a heat exchanger for exchanging heat between the heat of the heated heat medium and the water supply. 3 is a water supply pipe for supplying water from the water supply, 4 is a mixing valve for mixing hot water heated by the heat exchanger 52 and unheated water branched from the water supply pipe 3, and 5 is a hot water temperature from the mixing valve 4. , 6 is a flow rate detection means for detecting the amount of hot water from the mixing valve 4, 7 is a shower head as a hot water terminal for mixed water, 8 is a curan as a second hot water terminal for mixed water, 59 Is a control device for controlling the opening degree of the mixing valve 4, and 50 is a control reference for the mixing ratio of the mixing valve 4 and a remote controller for instructing the start of the mixing ratio control. The heating means 1 uses a combustion system in which gas is burned by a burner.

  The operation of the hot and cold shower of this water heater will be described with reference to FIG.

  First, when the reference temperature of the mixing valve 4 and the start command of the hot and cold shower are set from the remote controller 50, and the shower head 7 or the currant 8 is opened, the heating means 51 is circulated as a heating medium. Start heating. When the shower head 7 or the currant 8 is opened, water is supplied to the water heater by the pressure on the upstream side of the water supply, and the heat on the heat medium side and the water supplied from the water supply pipe are heat-exchanged through the heat exchanger 52. The water supply becomes hot.

  At this time, the control device 59 determines the high and low temperatures and the cycle time according to the reference temperature instructed from the remote controller 50, and opens the mixing valve 4 so that the hot water supply temperature detecting means reaches a predetermined temperature. Adjust the degree.

  The mixing valve 4 adjusts the mixing ratio so as to reduce the mixing amount from the water supply pipe 3 when discharging hot water, and mixes the mixing amount from the water supply pipe 3 when discharging low temperature hot water. The ratio is adjusted, or the mixing ratio is changed so as not to mix the high-temperature water from the heat exchanger 52 side.

  By using the mixing valve 4 to change the temperature by mixing hot hot water and feed water, the temperature adjustment delay by only the heating means 51 is reduced, and the temperature of the hot and cold shower can be changed quickly.

JP 2010-014363 A

However, judging from the situation where hot water is used, for example, there are very many situations where the shower head 7 installed in the bathroom and the currant 8 installed in the kitchen are used simultaneously.

  According to the conventional configuration, when simultaneous hot water is supplied from another hot water supply terminal during the hot and cold shower, the flow rate increases rapidly, while the combustion amount of the heating means 51 is rapidly increased. Since the temperature cannot be increased to a predetermined temperature, a temperature drop occurs immediately.

  Moreover, the control of the combustion type heating means 51 detects the hot water supply temperature acquired from the hot water supply temperature detection means 5 and adjusts the amount of combustion, but after the hot water supply temperature is lowered, the predetermined temperature is discharged. Adjustment takes time.

  That is, once the hot water supply temperature is lowered, the mixing ratio in the mixing valve 4 is changed so as to increase on the high temperature side. However, since hot water is supplied from the heat exchanger 52 due to an increase in the combustion amount, Becomes a temperature higher than a predetermined temperature.

  Then, although the amount of combustion is reduced next, the mixing valve 4 also increases the mixing ratio from the high-temperature supply side, and hot water having a temperature lower than a predetermined temperature is supplied.

  In this way, it takes time for the temperature hunting to occur and the temperature to stabilize because the change in the combustion amount and the change in the mixing ratio of the mixing valve 4 operate simultaneously.

  In particular, in a hot / cold shower such as a hot / cold shower that alternately supplies hot water at a high temperature and low temperature in a short time, the poor stability of the hot water supply temperature does not satisfy the conditions for the hot / cold shower.

  If hot water is supplied during a hot / cold shower and simultaneous hot water supply occurs, the flow rate in the pipe will increase rapidly, once the hot water will be supplied, and the amount of combustion will increase immediately. At the same time, the high temperature side of the mixing ratio of the mixing valve increases, and hot water is supplied at a temperature higher than the high temperature of the hot and cold shower. Since hunting at such a temperature occurs, the user is exposed to a temperature that is too high, and comfort is impaired.

  On the other hand, if low-temperature hot water is supplied during a hot / cold shower, if simultaneous hot water supply occurs, the flow rate in the pipe increases rapidly, and is once lower than the low-temperature temperature in the hot / cold shower. As soon as the hot water is supplied, the amount of combustion increases, the high temperature side of the mixing ratio of the mixing valve increases, and the hot water temperature higher than the hot temperature of the hot and cold shower is supplied.

  Thus, since temperature hunting occurs, the user is exposed to a temperature that is too low and the comfort is impaired.

  The present invention solves the above-mentioned conventional problems, and by performing a hot and cold shower using hot water in a hot water storage tank, a hot and cold shower with stable temperature fluctuation can be realized, and a hot water storage type excellent in usability It aims at providing a hot-water supply apparatus.

In order to solve the above-mentioned conventional problems, a hot water storage type hot water supply apparatus of the present invention comprises a heating means, a hot water storage tank for storing hot water heated by the heating means, hot water from the hot water storage tank and a temperature higher than that. A mixing valve for mixing low water, a hot water temperature setting means for setting the temperature of hot water mixed in the mixing valve and supplied to the hot water supply terminal, and a hot water storage temperature detecting means disposed in the upper part of the hot water tank When, and a control device, said control device by changing the mixing ratio of the mixing valve, hot water temperature flowing through the hot-water supply terminal from the mixing valve has an operating mode in which high and low and repeated variations, the hot water storage Warm
When the detected temperature of the degree detection means is equal to or higher than the set hot water temperature, the control device starts the operation mode from an operation of driving the mixing valve to a low temperature side. It is.

  This makes it possible to realize a hot / cold shower with stable temperature fluctuation by performing hot / cold shower using hot water stored in a hot water tank stored at a predetermined temperature, and a hot water storage type hot water supply device with excellent usability. Can be provided.

This also reduces the possibility that the operation mode is started from a hot water supply temperature that is significantly higher than the set hot water temperature desired by the user, and provides a hot water storage type hot water supply device having a hot and cold shower function excellent in comfort and safety. Can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, by performing hot and cold shower using the hot water in a hot water storage tank, the hot and cold shower of the stable temperature fluctuation can be implement | achieved and the hot water storage type hot water supply apparatus excellent in usability can be provided.

The block diagram of the hot water storage type hot water supply apparatus in Embodiment 1 of this invention External view of remote control (bath) of hot water storage type hot water supply apparatus in Embodiment 1 of the present invention Flow chart of mixing valve control during same temperature cold shower The figure which shows the time change of the hot-water supply temperature at the time of the same temperature cold shower The figure which shows the relationship between the hot-water supply flow rate and flow-path area of the same flow regulating valve The figure which shows the time change of the hot water supply flow rate at the time of the hot water supply flow rate adjustment control The figure which shows the temperature distribution in the hot water storage tank at the time of using a heater as a heating means The figure which shows the temperature distribution in the hot water storage tank of the hot water storage type hot water supply apparatus in Embodiment 1 of this invention. Flowchart of mixing valve control during hot and cold shower in Embodiment 2 of the present invention The figure which shows the time change of the hot-water supply temperature at the time of the same temperature cold shower Configuration diagram of conventional hot water supply equipment

The first invention includes a heating means, a hot water storage tank for storing hot water heated by the heating means, a mixing valve for mixing hot water from the hot water storage tank and water having a temperature lower than that, and the mixing valve. The hot water supply temperature setting means for setting the temperature of hot water supplied to the hot water supply terminal, the hot water storage temperature detection means disposed at the upper part of the hot water storage tank, and a control device, It has an operation mode in which the temperature of hot water flowing from the mixing valve to the hot water supply terminal is repeatedly changed between high and low by changing the mixing ratio of the mixing valve, and the detected temperature of the hot water storage temperature detecting means is the same as the set hot water temperature or When the temperature is higher than the above, the control device starts the operation mode from an operation of driving the mixing valve to a low temperature side .

This makes it possible to realize a hot / cold shower with stable temperature fluctuation by performing hot / cold shower using hot water stored in a hot water tank stored at a predetermined temperature, and a hot water storage type hot water supply device with excellent usability. Can be provided .

This also reduces the possibility that the operation mode is started from a hot water supply temperature that is significantly higher than the set hot water temperature desired by the user, and provides a hot water storage type hot water supply device having a hot and cold shower function excellent in comfort and safety. Can be provided.

A second invention is, in particular, Te first invention smell, Bei give a disposed the hot water temperature detected hand stage on the downstream side of the pre-SL mixing valve, the detection temperature of the hot water supply temperature detecting means is lower than the set hot water supply temperature In this case, the control device starts the operation mode from an operation of driving the mixing valve to a high temperature side.

  Thereby, since the said operation mode can be started, making it reach | attain quickly the set hot water supply temperature which a user desires, the hot water storage type hot water supply apparatus which has the hot and cold shower function excellent in comfort can be provided.

A third invention is particularly Te first to second one of the invention smell, hot water of the average temperature flowing through the hot-water supply terminal from the mixing valve before SL operation mode, and wherein the lower than the set hot water supply temperature This is a hot water storage type hot water supply device.

  Thereby, in addition to the comfort by the fluctuation | variation of temperature, the hot water storage type hot-water supply apparatus which has the hot and cold shower function used as energy saving can be provided.

A fourth invention is, in particular, Te first to third either invention odor, operation hot water flowing from the front Symbol mixing valve to the hot water supply terminal are controlled such that the set hot water supply temperature at the mixing valve The amount of heat per unit time of hot water flowing from the mixing valve to the hot water supply terminal during the operation mode operation when the operation mode is shifted from the mixing valve before the shift to the operation mode is determined. It is characterized by being smaller than the amount of heat per unit time of hot and cold water flowing through.

  Thereby, in addition to the comfort by the fluctuation | variation of temperature, the hot water storage type hot-water supply apparatus which has the hot and cold shower function used as energy saving can be provided.

In a fifth aspect of the invention, in particular , in any one of the first to fourth aspects of the invention, the heating means is a heat pump device, and water in the lower part of the hot water tank is heated by the heat pump device and then returned to the upper part of the hot water tank. It is characterized by that.

  As a result, a hot / cold shower with stable temperature fluctuations is realized by performing hot / cold shower using hot water in a hot water tank stored at a predetermined temperature heated by a heat pump device with high energy conversion efficiency. In addition, it is possible to provide a hot water storage type hot water supply device that is excellent in energy saving.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a hot water storage type hot water supply apparatus according to a first embodiment of the present invention.

  In FIG. 1, a hot water storage type hot water supply apparatus of the present invention supplies hot water to a hot water storage tank 11, a heat pump device that is heating means 1 for heating water in the hot water storage tank 11, and a lower part of the hot water storage tank 11 via a pressure reducing valve 14. Electricity which mixes the hot water sent from the hot water supply pipe 3 and the hot water supply pipe 2 arrange | positioned at the upper part of the hot water storage tank 11, and the water from the feed water branch pipe 15 branched from the water supply pipe 3 in the downstream of the said pressure reduction valve 14 is mixed. And a mixing valve 4 of the type.

  Further, on the downstream side of the mixing valve 4, the mixing valve 4 is disposed between the mixing valve 4 and a hot water supply terminal 7 that is a shower head or a second hot water supply terminal 8 that is a curan of a kitchen or a washroom. There are provided hot water temperature detecting means 5 for detecting the hot water temperature of the mixed hot water and flow rate detecting means 6 for detecting the flow rate of the hot water mixed by the mixing valve 4.

  In addition, a flow rate adjusting valve 12 that adjusts the flow rate of hot water supplied from the hot water supply terminal 7 that is a shower head and the second hot water supply terminal 8 that is a curan, a control device 9, and a remote controller 10 in a bathroom, a kitchen, and the like. .

  The operation and action of the storage type hot water supply apparatus configured as described above will be described below.

  First, a heating operation and a hot water supply operation which are basic operations of the storage type hot water supply apparatus of the present embodiment will be described.

  When heating the hot water in the hot water tank 11, hot water is taken out from the lower part of the hot water tank 11 with a circulation pump (not shown) arranged in the circulation circuit 16, heated by the heating means 1, The hot water is repeatedly returned to the upper part of the tank 11, and the hot water heated from the upper part is stored in the hot water tank 11, thereby generating a temperature stack from the upper part to the lower part. Water is heated at a predetermined temperature, and hot water heated at the predetermined temperature is stored in the hot water storage tank 11.

  Although the heating operation is mainly performed at night, a plurality of hot water is used and the remaining hot water (residual hot water) in the hot water storage tank 11 is reduced in the height direction of the outer periphery of the hot water storage tank 11. When it is determined using the hot water storage temperature detection means 13a to 13e, an additional heating operation is performed during the daytime to prepare for hot water prevention.

  In addition, when the hot water supply terminal 7 that is a shower head or the second hot water supply terminal 8 that is a currant is opened and hot water is generated, the control device 9 is disposed on the upper part (top surface) of the hot water tank 11. The hot water supply temperature setting means 108 (see FIG. 2) provided in the remote control 10 installed in the bathroom, kitchen, etc., with the mixing valve 4 to which the hot water supply pipe 2 and the water supply branch pipe 15 branched from the water supply pipe 3 are connected. ), By adjusting the temperature by determining the mixing ratio of the high temperature water from the upper part of the hot water tank 11 and the low temperature water from the water supply pipe 3 to the set hot water temperature set by the user to the desired hot water temperature. The hot water supply terminal 7 which is a shower head and the second hot water supply terminal 8 which is a currant are configured to supply hot water.

  In the present embodiment, the mixing valve 4 is described in which the hot water discharge pipe 2 disposed in the upper part of the hot water storage tank 11 and the feed water branch pipe 15 branched from the feed water pipe 3 are connected. A second mixing valve (not shown) is added upstream of the valve 4, a second hot water discharge pipe (not shown) is provided at a substantially central portion in the height direction of the hot water tank 11, and the second mixing valve Then, after mixing the hot water from the tapping pipe 2 and the hot water from the second tapping pipe, the water from the feed water branch pipe 15 may be mixed by the mixing valve 4. The mixing valve 4 may mix the hot water from the second hot water outlet pipe and the water from the feed water branch pipe 15, and then the hot water from the hot water outlet pipe 2 may be mixed by the mixing valve 4.

  That is, the temperature may be finally adjusted by the mixing valve 4 using hot water from the hot water discharge pipe 2 disposed in the upper part of the hot water storage tank 11 and water from the water supply branch pipe 15 branched from the water supply pipe 3.

  When hot water is generated, the amount of hot water supplied from the upper part of the hot water tank 11 is supplied to the lower part of the hot water tank 11 through the pressure reducing valve 14 from the water supply pipe 3 into the hot water tank 11, so that hot water is generated. As it goes on, low-temperature water increases from the bottom of the hot water tank 11 upward.

  Next, the operation of the hot and cold shower, which is an operation mode in which the control device 9 sequentially and repeatedly drives the mixing valve 4 to the low temperature side and the high temperature side, will be described.

In FIG. 2, the external view of the remote control 10 (bathroom remote control) installed in the bathroom is shown. When the user takes a hot and cold shower, the remote controller 10 sends a temperature change command from the remote controller 10 to the control device 9 by pressing at least the operation means 101 provided with the hot and cold shower start function. The shower becomes effective.

  In addition, when the operation unit 101 is pressed, it is possible to display a waveform, for example, on the portion 104 of the display unit of the remote controller 10 to notify the user that the temperature fluctuates.

  The remote control 10 (bath remote control) is provided with a priority button 102. If the priority button 102 is pressed, the control device 9 has priority over the remote control installed in another place such as a kitchen, for example. Control with the setting. In other words, the hot / cold shower may be enabled only when the priority button 102 is pressed.

  In addition, the remote control 10 is provided with infrared detection means as the person detection means 103, and can detect that a person is present in the bathroom. The hot / cold shower may be activated only when the person detection unit 103 can confirm the presence of a person.

  The control device 9 changes the mixing ratio of the mixing valve 4 according to a predetermined mixing ratio changing pattern. FIG. 3 shows a flowchart of the mixing valve control during the hot and cold shower.

  First, when the operating means 101 is pushed, the process for changing the mixing ratio of the mixing valve 4 is started. Of the hot water storage temperature detection means 13a to 13e arranged in the height direction of the outer periphery of the hot water storage tank 11 at the start of processing, the hot water storage temperature detection means 13a provided at the highest position above the hot water storage tank 11 The temperature to be detected is compared with the set hot water supply temperature (S301). If the temperature of the hot water storage temperature detection means 13a is higher than the set hot water supply temperature or the same, the mixing ratio of the mixing valve 4 is set to the lower temperature side. The operation of the mixing valve is started so as to increase (S302).

  When the detected temperature of the hot water storage temperature detection means 13a is lower than the set hot water supply temperature, the process is not performed and the process proceeds to the next process. Next, the ratio on the low temperature side of the mixing ratio is increased so that the hot water can be supplied at a low temperature (S305).

  Thereafter, the mixing ratio is kept in a fixed state for ΔtL seconds (S306), and after the elapse of tL seconds, the ratio on the high temperature side of the mixing ratio is increased (S307).

  For tH seconds, the mixture ratio is kept fixed (S308). After tH seconds have elapsed, the process returns to step S305 to increase the low temperature side of the mixture ratio. Thereafter, the processing from step S305 to step S308 is repeated until the condition for stopping the hot and cold shower is satisfied.

  The condition for stopping the hot / cold shower is, for example, when the operation means 101 is pressed and a stop instruction is received from the user, or when the hot water supply flow rate falls below a predetermined flow rate, the remaining hot water amount in the hot water storage tank 11 is determined. This is the case when the amount falls below the fixed amount.

  In the present embodiment, the determination is made based on the temperature detected by the hot water storage temperature detection means 13a disposed at the highest position in the upper part of the hot water tank 11, but in this case, a separate temperature detection means is provided. Since it is not necessary, it is particularly effective as a cost merit. However, a temperature detecting means may be separately provided on the upstream side of the mixing valve 4 of the tap pipe 2.

  That is, when the hot water temperature detected by the hot water storage temperature detection means 13a disposed at the highest position in the upper part of the hot water tank 11 is equal to or higher than the set hot water supply temperature, the mixing valve 4 is moved to the low temperature side. It is only necessary to start from the driving operation.

The time change of the hot water supply temperature at the time of a hot and cold shower when the above mixing valve control is performed will be described based on FIG.

  4 is the temperature of the hot water detected by the hot water storage temperature detection means 13a. When the user presses the operation means 101 of the remote controller 10, a hot / cold shower is started, and TS ° C. is higher than the set hot water supply temperature TH ° C. If the temperature is higher or the same, the hot water supply temperature becomes TH ° C. because the mixing ratio of the mixing valve 4 is changed so as to increase on the low temperature side. After continuing hot water supply at TH ° C for tH seconds, the mixture ratio of the mixing valve 4 is changed again so that the low temperature side increases, so that the temperature becomes TL ° C, which is a predetermined temperature (eg, 2 ° C) lower than TH ° C. .

  Next, TL ° C. is continued for tL seconds with the mixing ratio fixed, and then the high temperature side of the mixing ratio is increased to raise the temperature to TH ° C. That is, after THC is continued for tH seconds, the hot water supply temperature is lowered again to TL ° C, and the hot water supply temperature is repeatedly raised and lowered between TL ° C and TH ° C. The higher temperature at the time of temperature fluctuation of the hot / cold shower may be the same as the set hot water supply temperature TH ° C. or may be a predetermined temperature (for example, 1 ° C.) lower than that.

  Thus, by comparing the set hot water supply temperature with the temperature of the hot water storage tank 11 at the start of the hot / cold shower and operating the mixing valve 4 so that the mixing ratio of the mixing valve 4 is increased on the low temperature side, the temperature can be easily stabilized at a predetermined temperature. Since there is no possibility that the hot water temperature is significantly higher than the set hot water temperature, a hot and cold shower excellent in safety and comfort can be realized.

  Moreover, since the average hot water temperature TA ° C during the hot and cold shower in which the hot water temperature is repeatedly raised and lowered between TL ° C and TH ° C is lower than the set hot water temperature TH ° C, the mixing valve 4 is used as a shower head. When the hot water flowing through the hot water supply terminal 7 is shifted from the operation controlled to the set hot water supply temperature by the mixing valve 4 to the hot and cold shower, the hot water supply terminal that is a shower head from the mixing valve 4 during the hot and cold shower The amount of heat per unit time of the hot water flowing to 7 is controlled so as to be the set hot water supply temperature in the mixing valve 4 before being transferred to the hot and cold shower, and the hot water supply terminal that is a shower head from the mixing valve 4 Since it is smaller than the amount of heat per unit time of the hot water flowing through 7, the energy saving effect can also be obtained.

  In the present embodiment, when the operating means 101 is pressed, the flow rate is changed along with the hot water supply temperature. Reference numeral 12 in FIG. 1 denotes a flow rate adjusting valve that adjusts the hot water supply flow rate. The flow rate adjusting valve 12 adjusts the flow rate by driving the valve with a stepping motor.

  When the operation unit 101 is pressed, the control device 9 first acquires the hot water supply flow rate detected by the flow rate detection unit 6.

  FIG. 5 is a diagram showing the relationship between the flow path area of the flow rate adjusting valve 12 and the hot water supply flow rate, where the horizontal axis is the flow path area and the vertical axis is the hot water supply flow rate. FIG. 5 shows that when the channel area is small, the change in the flow rate is large with respect to the change in the channel area, but when the channel area is large, the change in the flow rate with respect to the change in the channel area is small.

  Therefore, when the flow rate variation of the same FL / min is given, it is necessary to change the flow channel area to be changed according to the flow rate before the fluctuation is given. When the flow rate is a, the amount of change is Pa, and when it is b, the amount of change is Pb.

  After detecting the hot water supply flow rate by the flow rate detection means 6, the control device 9 determines the flow channel area to be changed according to the detected hot water supply flow rate and drives the flow rate adjustment valve 12.

FIG. 6 shows an example of the flow rate change when the flow rate is changed. After the same operation means 101 as that of the warm shower is pressed, the flow rate Fs set by the user as desired and the flow rate stabilization standby for tW seconds.
Then, in the period of tF, the flow rate is changed between the flow rates Fs and Fl, that is, below the flow rate Fs set by the user.

  The time during which the flow rate is changed is displayed on the display unit 105 of the remote controller 10 in FIG. 2 by displaying that the flow rate is changed, thereby informing the user that the flow rate is changing. Further, for example, it is easy to understand even if the pictures 106 and 107 are alternately displayed in an animated manner.

  In this way, in the hot and cold shower, in addition to the temperature fluctuation, by giving the flow rate fluctuation, a massage effect can be obtained, and a continuous pressure stimulus to the skin is generated to promote an increase in the skin temperature. Therefore, the feeling of comfort can be improved, and the effects of water saving and energy saving can be obtained by changing the flow rate.

  As described above, hot water is generated at the second hot water supply terminal 8 which is a curan of a kitchen or a washroom when a hot and cold shower is supplied at the hot water supply terminal 7 which is a shower head in the bathroom, according to user's preference. Even in the present embodiment, in the present embodiment, even if hot water is generated from the second hot water supply terminal 8 that is a curan and the hot water flow rate rapidly increases, the hot water is discharged from the hot water storage tank 11 that stores hot water sufficiently. Therefore, the mixing ratio of the mixing valve 4 in the warm shower need not be changed.

  This is because the high-temperature water in the upper part of the hot water tank 11 has a substantially constant temperature and the temperature of the water supply water is also substantially constant, so that even if the overall flow rate changes, there is no need to change the mixing ratio.

  In addition, since the pressure reducing valve 14 is provided, the pressure in the hot water storage tank 11 and the water supply branch pipe 15 that are the sources of hot water is always kept constant even if simultaneous hot water supply occurs when the hot and cold shower is supplied. Since the pressure is not changed and the hot water supply flow rate does not change, the mixing ratio of the mixing valve 4 in the warm shower does not need to be changed.

  As described above, in this embodiment, the hot water storage tank 11 is provided in the present embodiment, and high temperature water is always stored in the upper part of the hot water storage tank 11, and the hot water storage tank is decompressed by the pressure reducing valve 14. 11 and the mixing valve 4 are allowed to enter the water, so that the stability of the hot water supply temperature can be improved.

  In particular, in a hot and cold shower that alternately supplies hot and cold water in a short time, it is effective for improving the stability of the hot water supply temperature.

  Here, when heating the hot water in the hot water tank 11 using a heat pump device as the heating means 1, and when heating is performed with a built-in heater inside the hot water tank 11, such as an electric water heater, for example. The difference in temperature stability is described.

  FIG. 7 shows the temperature distribution when heating the hot water in the hot water tank 11 when the heater is built in, and FIG. 8 shows the temperature distribution in the case of the heat pump device. 7 and 8, the horizontal axis represents the temperature in the hot water tank 11, and the vertical axis represents the height of the hot water tank 11.

  For example, when a heater is used for heating hot water in the hot water tank 11, since the heater is provided in the lower part of the hot water tank 11, the hot water heated by the heater rises toward the upper part of the hot water tank 11, and the temperature of the upper part is increased. Gradually becomes hot.

  As shown in FIG. 7, it can be seen from the temperature distribution 711 of the initial temperature that the temperature distribution 712 and the temperature distribution 713 change, and the temperature at the top of the hot water tank 11 changes with heating. For this reason, when hot water supply is generated during heating, it is necessary to change the mixing ratio of the mixing valve 4.

On the other hand, when the hot water in the hot water tank 11 is heated to a high temperature by the heat pump device, the operation of taking out the low temperature hot water from the lower part of the hot water tank 11 and heating it to a set temperature such as 80 ° C. and returning it to the upper part of the hot water tank 11 is performed. repeat.

  As shown in FIG. 8, immediately after the start of heating (temperature distribution 811), as shown in the temperature distribution 812 during heating, hot water of, for example, 80 ° C. is stored in the upper part of the hot water storage tank 11 immediately after the heating, and the heating ends (temperature Distribution 813) Hot water at 80 ° C. is stably stored until the time.

  For this reason, constant high temperature hot water of 80 ° C. is always stored in the upper part of the hot water tank 11, and even if hot water is generated, there is no need to change the mixing ratio of the mixing valve 4, so stable temperature control is performed. be able to.

  As described above, according to the embodiment of the present invention, hot water is simultaneously supplied from a plurality of hot water supply terminals by performing a hot and cold shower using the hot water stored in the hot water storage tank 11. A stable hot / cold shower with temperature fluctuations can be realized even if it occurs, and the pressure in the hot water storage tank 11 and the feed water branch pipe 15 that are the sources of hot water is always kept constant by the pressure reducing valve 14. Therefore, the hot water flow rate does not fluctuate, and a stable temperature fluctuation hot / cold shower can be realized.

(Embodiment 2)
The operation of the mixing valve 4 in the second embodiment of the present invention will be described with reference to the flowchart of the mixing valve control during the hot and cold shower in FIG. 9 is the same as that of the first embodiment except for the flowchart of the mixing valve control during the hot and cold shower in FIG. 9 and the time chart of the hot water supply temperature during the hot and cold shower in FIG.

  First, when the operating means 101 is pushed, the process for changing the mixing ratio of the mixing valve 4 is started. At the start of processing, the hot water temperature detected by the hot water temperature detecting means 5 attached downstream of the mixing valve 4 is compared with the set hot water temperature set by the user using the hot water temperature setting means 108 of the remote controller 10 ( (S303) When the set hot water supply temperature is higher than the hot water supply temperature, the operation of the mixing valve is started so that the mixing ratio of the mixing valve 4 is increased on the high temperature side (S304).

  When the hot water supply temperature is higher than the set hot water supply temperature, the process proceeds to the next process without performing the process. The ratio on the low temperature side of the mixing ratio of the mixing valve 4 is increased so that the hot water can be supplied at a low temperature (S305). Thereafter, the mixing ratio is kept fixed for tL seconds (S306), and after the elapse of tL seconds, the ratio on the high temperature side of the mixing ratio of the mixing valve 4 is increased (S307).

  For tH seconds, the mixture ratio is kept fixed (S308). After tH seconds have elapsed, the process returns to step S305 to increase the low temperature side of the mixture ratio. Thereafter, the processing from step S305 to step S308 is repeated until the condition for stopping the hot and cold shower is satisfied.

  The time change of the hot water supply temperature at the time of a hot and cold shower when the above mixing valve control is performed will be described based on FIG.

  10 is the hot water temperature detected by the hot water supply temperature detecting means 5, and when the user presses the operation means 101 of the remote controller 10, a hot and cold shower is started, and T0 ° C. is higher than the set hot water temperature TH ° C. To lower the temperature, the mixing ratio of the mixing valve 4 is changed so as to increase on the high temperature side, so the hot water supply temperature becomes the set hot water supply temperature TH ° C. After continuing the hot water supply at TH ° C for tH seconds, this time, the mixing ratio of the mixing valve 4 is changed so that the low temperature side increases, and the temperature becomes TL ° C, which is a predetermined temperature (eg, 2 ° C) lower than TH ° C. .

Next, TL ° C. is continued for tL seconds with the mixing ratio fixed, and then the high temperature side of the mixing ratio is increased to raise the temperature to TH ° C. That is, after THC is continued for tH seconds, the hot water supply temperature is lowered again to TL ° C, and the hot water supply temperature is repeatedly raised and lowered between TL ° C and TH ° C. The higher temperature at the time of temperature fluctuation of the hot / cold shower may be the same as the set hot water supply temperature TH ° C. or may be a predetermined temperature (for example, 1 ° C.) lower than that.

  Moreover, since the average hot water temperature TA ° C during the hot and cold shower in which the hot water temperature is repeatedly raised and lowered between TL ° C and TH ° C is lower than the set hot water temperature TH ° C, the mixing valve 4 is used as a shower head. When the hot water flowing through the hot water supply terminal 7 is shifted from the operation controlled to the set hot water supply temperature by the mixing valve 4 to the hot and cold shower, the hot water supply terminal that is a shower head from the mixing valve 4 during the hot and cold shower The amount of heat per unit time of the hot water flowing to 7 is controlled so as to be the set hot water supply temperature in the mixing valve 4 before being transferred to the hot and cold shower, and the hot water supply terminal that is a shower head from the mixing valve 4 Since it is smaller than the amount of heat per unit time of the hot water flowing through 7, the energy saving effect can also be obtained.

  In this way, when the hot and cold shower is started, the set hot water temperature is compared with the hot water temperature which is the detected temperature of the hot water temperature detecting means 5, and if the detected temperature of the hot water temperature detecting means 5 is lower than the set hot water temperature, the mixing is performed. By changing the mixing ratio of the valve 4 so that the high temperature side becomes larger, the control of the mixing valve 4 is started, so that a warm and cool shower without waste can be realized.

  As described above, the hot water storage type hot water supply apparatus according to the present invention can realize a hot and cold shower with stable temperature fluctuation by performing a hot and cold shower using hot water in a hot water storage tank. It can be applied to large hot water supply systems as well as to commercial water heaters.

DESCRIPTION OF SYMBOLS 1 Heating means 2 Hot water pipe 3 Water supply pipe 4 Mixing valve 5 Hot water supply temperature detection means 6 Flow rate detection means 7 Hot water supply terminal (shower head)
8 Second hot water supply terminal (Karan)
DESCRIPTION OF SYMBOLS 9 Control apparatus 10 Remote control 11 Hot water storage tank 12 Flow rate adjustment valve 13a-13e Hot water storage temperature detection means 14 Pressure reducing valve 15 Water supply branch pipe 16 Circulation circuit 101 Operation means 108 Hot water supply temperature setting means

Claims (5)

Heating means, a hot water storage tank for storing hot water heated by the heating means, a mixing valve for mixing hot water from the hot water storage tank and water having a temperature lower than the hot water, and mixing at the mixing valve , A hot water supply temperature setting means for setting the temperature of hot water supplied to the terminal, a hot water storage temperature detection means disposed at the upper part of the hot water storage tank, and a control device, wherein the control device determines the mixing ratio of the mixing valve. The operation mode is such that the temperature of hot water flowing from the mixing valve to the hot water supply terminal is repeatedly changed between high and low, and the detected temperature of the hot water storage temperature detecting means is equal to or higher than the set hot water temperature. The control device starts the operation mode from an operation of driving the mixing valve to a low temperature side . E Bei a disposed downstream by a hot water temperature detected hand stage of the mixed joint, when the detected temperature of the hot water supply temperature detecting means is lower than the set hot water supply temperature, the controller, the operation mode, the The hot water storage type hot water supply apparatus according to claim 1 , wherein the hot water storage apparatus starts with an operation of driving the mixing valve to a high temperature side. The luck hot water average temperature flowing through the hot-water supply terminal from the mixing valve in the rotation mode, the hot water storage type water heater according to claim 1 or 2, characterized in that lower than the set hot water supply temperature. The hot water flowing from the mixing joint to the hot water supply terminal, the operation is controlled so that the set hot water supply temperature at the mixing valve, when transition to the operation mode, from the mixing valve when the operation mode operation The amount of heat per unit time of hot water flowing to the hot water supply terminal is smaller than the amount of heat per unit time of hot water flowing from the mixing valve to the hot water supply terminal before shifting to the operation mode . hot water storage type hot water supply apparatus according to any one of 3. Said heating means and heat pump apparatus, wherein after the hot water tank bottom water was heated at the heat pump apparatus, according to claim 1, characterized in that it has a structure to return to the hot water tank top Hot water storage system.